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linux_dsm_epyc7002/fs/btrfs/qgroup.c
AuxXxilium 5fa3ea047a init: add dsm gpl source 
Signed-off-by: AuxXxilium <info@auxxxilium.tech>
2024-07-05 18:00:04 +02:00

6828 lines
179 KiB
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#ifndef MY_ABC_HERE
#define MY_ABC_HERE
#endif
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2011 STRATO. All rights reserved.
*/
#include <linux/sched.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
#include <linux/rbtree.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/btrfs.h>
#include <linux/sched/mm.h>
#ifdef MY_ABC_HERE
#include <net/netlink.h>
#include <net/genetlink.h>
#endif /* MY_ABC_HERE */
#include "ctree.h"
#include "transaction.h"
#include "disk-io.h"
#include "locking.h"
#include "ulist.h"
#include "backref.h"
#include "extent_io.h"
#include "qgroup.h"
#include "block-group.h"
#include "sysfs.h"
/* TODO XXX FIXME
* - subvol delete -> delete when ref goes to 0? delete limits also?
* - reorganize keys
* - compressed
* - sync
* - copy also limits on subvol creation
* - limit
* - caches for ulists
* - performance benchmarks
* - check all ioctl parameters
*/
#ifdef MY_ABC_HERE
enum {
SENT_UNDER = -1,
SENT_NONE = 0,
SENT_OVER = 1,
};
u64 qgroup_soft_limit = 0;
static const struct genl_multicast_group qgroup_mcgrps[] = {
{ .name = "events", },
};
/* Netlink family structure for quota */
static struct genl_family btrfs_qgroup_genl_family __ro_after_init = {
.module = THIS_MODULE,
.hdrsize = 0,
.name = "BTRFS_QUOTA",
.version = 1,
.maxattr = QGROUP_NL_A_MAX,
.mcgrps = qgroup_mcgrps,
.n_mcgrps = ARRAY_SIZE(qgroup_mcgrps),
};
#ifdef MY_ABC_HERE
static void prepare_netlink_notification(struct btrfs_qgroup *qg,
u64 *soft_qgroup_subvol_id, u64 *soft_qgroup_limit, u64 *soft_qgroup_used,
bool *over_limit)
{
u64 soft_limit;
if (!(qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) || !qgroup_soft_limit)
return;
soft_limit = div_u64(qg->max_rfer * qgroup_soft_limit, 100);
// Should we send QGROUP_NL_C_OVER_LIMIT?
if (qg->last_sent != SENT_OVER && qg->rfer > soft_limit) {
qg->last_sent = SENT_OVER;
*over_limit = true;
goto notify;
}
// Should we send QGROUP_NL_C_UNDER_LIMIT?
if (qg->last_sent != SENT_UNDER) {
if (soft_limit <= SZ_1M * 100)
return;
if (qg->rfer >= div_u64(qg->max_rfer * (qgroup_soft_limit - 1), 100))
return;
if (qg->rfer >= soft_limit - (SZ_1M * 100))
return;
qg->last_sent = SENT_UNDER;
*over_limit = false;
goto notify;
}
return;
notify:
*soft_qgroup_subvol_id = qg->qgroupid;
*soft_qgroup_limit = qg->max_rfer;
*soft_qgroup_used = qg->rfer;
}
static void send_netlink_notification(struct btrfs_fs_info *fs_info, u64 qgroupid,
u64 quota_limit, u64 quota_used, int type)
{
static atomic_t seq = ATOMIC_INIT(0);
struct sk_buff *skb;
void *msg_head;
int ret;
int msg_size = nla_total_size(BTRFS_FSID_SIZE) + (3 * nla_total_size_64bit(sizeof(u64)));
/* We have to allocate using GFP_NOFS as we are called from a
* filesystem performing write and thus further recursion into
* the fs to free some data could cause deadlocks. */
skb = genlmsg_new(msg_size, GFP_NOFS);
if (!skb) {
btrfs_warn(fs_info, "Not enough memory to send qgroup warning.\n");
return;
}
msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
&btrfs_qgroup_genl_family, 0, type);
if (!msg_head) {
btrfs_warn(fs_info, "Cannot store netlink header in qgroup warning.\n");
goto err_out;
}
ret = nla_put(skb, QGROUP_NL_A_FSID, BTRFS_FSID_SIZE, fs_info->super_copy->fsid);
if (ret)
goto attr_err_out;
ret = nla_put_u64_64bit(skb, QGROUP_NL_A_SUBVOL_ID, qgroupid, QUOTA_NL_A_PAD);
if (ret)
goto attr_err_out;
ret = nla_put_u64_64bit(skb, QGROUP_NL_A_QUOTA_LIMIT, quota_limit, QUOTA_NL_A_PAD);
if (ret)
goto attr_err_out;
ret = nla_put_u64_64bit(skb, QGROUP_NL_A_QUOTA_USED, quota_used, QUOTA_NL_A_PAD);
if (ret)
goto attr_err_out;
genlmsg_end(skb, msg_head);
genlmsg_multicast(&btrfs_qgroup_genl_family, skb, 0, 0, GFP_NOFS);
return;
attr_err_out:
btrfs_warn(fs_info, "Not enough space to compose qgroup netlink message!\n");
err_out:
kfree_skb(skb);
}
#endif /* MY_ABC_HERE */
int __init qgroup_netlink_init(void)
{
if (genl_register_family(&btrfs_qgroup_genl_family) != 0)
printk(KERN_ERR
"Failed to create btrfs qgroup netlink interface.\n");
return 0;
};
void qgroup_netlink_exit(void)
{
genl_unregister_family(&btrfs_qgroup_genl_family);
};
#endif /* MY_ABC_HERE */
/*
* Helpers to access qgroup reservation
*
* Callers should ensure the lock context and type are valid
*/
static u64 qgroup_rsv_total(const struct btrfs_qgroup *qgroup)
{
u64 ret = 0;
int i;
for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++)
ret += qgroup->rsv.values[i];
return ret;
}
#ifdef CONFIG_BTRFS_DEBUG
static const char *qgroup_rsv_type_str(enum btrfs_qgroup_rsv_type type)
{
if (type == BTRFS_QGROUP_RSV_DATA)
return "data";
if (type == BTRFS_QGROUP_RSV_META_PERTRANS)
return "meta_pertrans";
if (type == BTRFS_QGROUP_RSV_META_PREALLOC)
return "meta_prealloc";
return NULL;
}
#endif
static void qgroup_rsv_add(struct btrfs_fs_info *fs_info,
struct btrfs_qgroup *qgroup, u64 num_bytes,
enum btrfs_qgroup_rsv_type type)
{
trace_qgroup_update_reserve(fs_info, qgroup, num_bytes, type);
qgroup->rsv.values[type] += num_bytes;
}
static void qgroup_rsv_release(struct btrfs_fs_info *fs_info,
struct btrfs_qgroup *qgroup, u64 num_bytes,
enum btrfs_qgroup_rsv_type type)
{
trace_qgroup_update_reserve(fs_info, qgroup, -(s64)num_bytes, type);
if (qgroup->rsv.values[type] >= num_bytes) {
qgroup->rsv.values[type] -= num_bytes;
return;
}
#ifdef MY_ABC_HERE
WARN_ONCE(1, "qgroup %llu reserved space underflow, have %llu to free %llu",
qgroup->qgroupid,
qgroup->rsv.values[type], num_bytes);
#endif /* MY_ABC_HERE */
#ifdef CONFIG_BTRFS_DEBUG
WARN_RATELIMIT(1,
"qgroup %llu %s reserved space underflow, have %llu to free %llu",
qgroup->qgroupid, qgroup_rsv_type_str(type),
qgroup->rsv.values[type], num_bytes);
#endif
qgroup->rsv.values[type] = 0;
}
#ifdef MY_ABC_HERE
#else
static void qgroup_rsv_add_by_qgroup(struct btrfs_fs_info *fs_info,
struct btrfs_qgroup *dest,
struct btrfs_qgroup *src)
{
int i;
for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++)
qgroup_rsv_add(fs_info, dest, src->rsv.values[i], i);
}
static void qgroup_rsv_release_by_qgroup(struct btrfs_fs_info *fs_info,
struct btrfs_qgroup *dest,
struct btrfs_qgroup *src)
{
int i;
for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++)
qgroup_rsv_release(fs_info, dest, src->rsv.values[i], i);
}
static void btrfs_qgroup_update_old_refcnt(struct btrfs_qgroup *qg, u64 seq,
int mod)
{
if (qg->old_refcnt < seq)
qg->old_refcnt = seq;
qg->old_refcnt += mod;
}
static void btrfs_qgroup_update_new_refcnt(struct btrfs_qgroup *qg, u64 seq,
int mod)
{
if (qg->new_refcnt < seq)
qg->new_refcnt = seq;
qg->new_refcnt += mod;
}
static inline u64 btrfs_qgroup_get_old_refcnt(struct btrfs_qgroup *qg, u64 seq)
{
if (qg->old_refcnt < seq)
return 0;
return qg->old_refcnt - seq;
}
static inline u64 btrfs_qgroup_get_new_refcnt(struct btrfs_qgroup *qg, u64 seq)
{
if (qg->new_refcnt < seq)
return 0;
return qg->new_refcnt - seq;
}
#endif /* MY_ABC_HERE */
/*
* glue structure to represent the relations between qgroups.
*/
struct btrfs_qgroup_list {
struct list_head next_group;
struct list_head next_member;
struct btrfs_qgroup *group;
struct btrfs_qgroup *member;
};
static inline u64 qgroup_to_aux(struct btrfs_qgroup *qg)
{
return (u64)(uintptr_t)qg;
}
static inline struct btrfs_qgroup* unode_aux_to_qgroup(struct ulist_node *n)
{
return (struct btrfs_qgroup *)(uintptr_t)n->aux;
}
static int
qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
int init_flags);
static void qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info);
/* must be called with qgroup_ioctl_lock held */
static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info,
u64 qgroupid)
{
struct rb_node *n = fs_info->qgroup_tree.rb_node;
struct btrfs_qgroup *qgroup;
while (n) {
qgroup = rb_entry(n, struct btrfs_qgroup, node);
if (qgroup->qgroupid < qgroupid)
n = n->rb_left;
else if (qgroup->qgroupid > qgroupid)
n = n->rb_right;
else
return qgroup;
}
return NULL;
}
/* must be called with qgroup_lock held */
static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info,
u64 qgroupid)
{
struct rb_node **p = &fs_info->qgroup_tree.rb_node;
struct rb_node *parent = NULL;
struct btrfs_qgroup *qgroup;
while (*p) {
parent = *p;
qgroup = rb_entry(parent, struct btrfs_qgroup, node);
if (qgroup->qgroupid < qgroupid)
p = &(*p)->rb_left;
else if (qgroup->qgroupid > qgroupid)
p = &(*p)->rb_right;
else
return qgroup;
}
qgroup = kzalloc(sizeof(*qgroup), GFP_ATOMIC);
if (!qgroup)
return ERR_PTR(-ENOMEM);
qgroup->qgroupid = qgroupid;
INIT_LIST_HEAD(&qgroup->groups);
INIT_LIST_HEAD(&qgroup->members);
INIT_LIST_HEAD(&qgroup->dirty);
rb_link_node(&qgroup->node, parent, p);
rb_insert_color(&qgroup->node, &fs_info->qgroup_tree);
return qgroup;
}
static void __del_qgroup_rb(struct btrfs_fs_info *fs_info,
struct btrfs_qgroup *qgroup)
{
struct btrfs_qgroup_list *list;
list_del(&qgroup->dirty);
while (!list_empty(&qgroup->groups)) {
list = list_first_entry(&qgroup->groups,
struct btrfs_qgroup_list, next_group);
list_del(&list->next_group);
list_del(&list->next_member);
kfree(list);
}
while (!list_empty(&qgroup->members)) {
list = list_first_entry(&qgroup->members,
struct btrfs_qgroup_list, next_member);
list_del(&list->next_group);
list_del(&list->next_member);
kfree(list);
}
}
/* must be called with qgroup_lock held */
static int del_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid)
{
struct btrfs_qgroup *qgroup = find_qgroup_rb(fs_info, qgroupid);
if (!qgroup)
return -ENOENT;
rb_erase(&qgroup->node, &fs_info->qgroup_tree);
__del_qgroup_rb(fs_info, qgroup);
return 0;
}
/* must be called with qgroup_lock held */
static int add_relation_rb(struct btrfs_fs_info *fs_info,
u64 memberid, u64 parentid)
{
struct btrfs_qgroup *member;
struct btrfs_qgroup *parent;
struct btrfs_qgroup_list *list;
member = find_qgroup_rb(fs_info, memberid);
parent = find_qgroup_rb(fs_info, parentid);
if (!member || !parent)
return -ENOENT;
list = kzalloc(sizeof(*list), GFP_ATOMIC);
if (!list)
return -ENOMEM;
list->group = parent;
list->member = member;
list_add_tail(&list->next_group, &member->groups);
list_add_tail(&list->next_member, &parent->members);
return 0;
}
/* must be called with qgroup_lock held */
static int del_relation_rb(struct btrfs_fs_info *fs_info,
u64 memberid, u64 parentid)
{
struct btrfs_qgroup *member;
struct btrfs_qgroup *parent;
struct btrfs_qgroup_list *list;
member = find_qgroup_rb(fs_info, memberid);
parent = find_qgroup_rb(fs_info, parentid);
if (!member || !parent)
return -ENOENT;
list_for_each_entry(list, &member->groups, next_group) {
if (list->group == parent) {
list_del(&list->next_group);
list_del(&list->next_member);
kfree(list);
return 0;
}
}
return -ENOENT;
}
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
u64 rfer, u64 excl)
{
struct btrfs_qgroup *qgroup;
qgroup = find_qgroup_rb(fs_info, qgroupid);
if (!qgroup)
return -EINVAL;
if (qgroup->rfer != rfer || qgroup->excl != excl)
return -EINVAL;
return 0;
}
#endif
#ifdef MY_ABC_HERE
static void update_syno_quota_rescan_progress(struct btrfs_root *quota_root,
struct syno_quota_rescan_ctx *ctx, u64 subvol_id,
enum syno_quota_rescan_progress_update_type type);
#endif /* MY_ABC_HERE */
/*
* The full config is read in one go, only called from open_ctree()
* It doesn't use any locking, as at this point we're still single-threaded
*/
int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info)
{
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_root *quota_root = fs_info->quota_root;
struct btrfs_path *path = NULL;
struct extent_buffer *l;
int slot;
int ret = 0;
u64 flags = 0;
u64 rescan_progress = 0;
#ifdef MY_ABC_HERE
u64 subvol_id;
#endif /* MY_ABC_HERE */
#ifdef MY_ABC_HERE
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags))
#else
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
#endif /* MY_ABC_HERE */
return 0;
fs_info->qgroup_ulist = ulist_alloc(GFP_KERNEL);
if (!fs_info->qgroup_ulist) {
ret = -ENOMEM;
goto out;
}
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
#ifdef MY_ABC_HERE
path->reada = READA_FORWARD_ALWAYS;
#endif /* MY_ABC_HERE */
ret = btrfs_sysfs_add_qgroups(fs_info);
if (ret < 0)
goto out;
/* default this to quota off, in case no status key is found */
fs_info->qgroup_flags = 0;
/*
* pass 1: read status, all qgroup infos and limits
*/
key.objectid = 0;
key.type = 0;
key.offset = 0;
ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 1);
if (ret)
goto out;
while (1) {
struct btrfs_qgroup *qgroup;
slot = path->slots[0];
l = path->nodes[0];
btrfs_item_key_to_cpu(l, &found_key, slot);
if (found_key.type == BTRFS_QGROUP_STATUS_KEY) {
struct btrfs_qgroup_status_item *ptr;
ptr = btrfs_item_ptr(l, slot,
struct btrfs_qgroup_status_item);
#ifdef MY_ABC_HERE
if (test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags) &&
btrfs_qgroup_status_version(l, ptr) !=
BTRFS_QGROUP_V2_STATUS_VERSION) {
btrfs_err(fs_info,
"syno quota v2 found bad %llu version, quota disabled",
btrfs_qgroup_status_version(l, ptr));
goto out;
}
if (test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags) &&
btrfs_qgroup_status_version(l, ptr) !=
BTRFS_QGROUP_STATUS_VERSION) {
btrfs_err(fs_info,
"syno quota v1 found bad %llu version, quota disabled",
btrfs_qgroup_status_version(l, ptr));
goto out;
}
#else
if (btrfs_qgroup_status_version(l, ptr) !=
BTRFS_QGROUP_STATUS_VERSION) {
btrfs_err(fs_info,
"old qgroup version, quota disabled");
goto out;
}
#endif /* MY_ABC_HERE */
if (btrfs_qgroup_status_generation(l, ptr) !=
fs_info->generation) {
flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
btrfs_err(fs_info,
"qgroup generation mismatch, marked as inconsistent");
}
fs_info->qgroup_flags = btrfs_qgroup_status_flags(l,
ptr);
rescan_progress = btrfs_qgroup_status_rescan(l, ptr);
goto next1;
}
if (found_key.type != BTRFS_QGROUP_INFO_KEY &&
found_key.type != BTRFS_QGROUP_LIMIT_KEY)
goto next1;
qgroup = find_qgroup_rb(fs_info, found_key.offset);
if ((qgroup && found_key.type == BTRFS_QGROUP_INFO_KEY) ||
(!qgroup && found_key.type == BTRFS_QGROUP_LIMIT_KEY)) {
btrfs_err(fs_info, "inconsistent qgroup config");
flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
}
if (!qgroup) {
qgroup = add_qgroup_rb(fs_info, found_key.offset);
if (IS_ERR(qgroup)) {
ret = PTR_ERR(qgroup);
goto out;
}
}
ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
if (ret < 0)
goto out;
switch (found_key.type) {
case BTRFS_QGROUP_INFO_KEY: {
struct btrfs_qgroup_info_item *ptr;
ptr = btrfs_item_ptr(l, slot,
struct btrfs_qgroup_info_item);
qgroup->rfer = btrfs_qgroup_info_rfer(l, ptr);
qgroup->rfer_cmpr = btrfs_qgroup_info_rfer_cmpr(l, ptr);
qgroup->excl = btrfs_qgroup_info_excl(l, ptr);
qgroup->excl_cmpr = btrfs_qgroup_info_excl_cmpr(l, ptr);
/* generation currently unused */
break;
}
case BTRFS_QGROUP_LIMIT_KEY: {
struct btrfs_qgroup_limit_item *ptr;
ptr = btrfs_item_ptr(l, slot,
struct btrfs_qgroup_limit_item);
qgroup->lim_flags = btrfs_qgroup_limit_flags(l, ptr);
qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(l, ptr);
qgroup->max_excl = btrfs_qgroup_limit_max_excl(l, ptr);
qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(l, ptr);
qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(l, ptr);
break;
}
}
next1:
ret = btrfs_next_item(quota_root, path);
if (ret < 0)
goto out;
if (ret)
break;
}
btrfs_release_path(path);
#ifdef MY_ABC_HERE
// Setup rescan before pass 2, since we may goto out in pass 2 and miss the rescan setup.
subvol_id = rescan_progress;
// No need to rescan. Go to pass 2.
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags) || !subvol_id)
goto pass2;
fs_info->syno_quota_rescan_ctx = kzalloc(sizeof(struct syno_quota_rescan_ctx), GFP_KERNEL);
if (!fs_info->syno_quota_rescan_ctx) {
btrfs_warn(fs_info, "Failed to alloc syno_quota_rescan_ctx");
ret = -ENOMEM;
goto out;
}
fs_info->syno_quota_rescan_subvol_ulist = ulist_alloc(GFP_KERNEL);
if (!fs_info->syno_quota_rescan_subvol_ulist) {
btrfs_warn(fs_info, "Failed to alloc syno_quota_rescan_subvol_ulist");
ret = -ENOMEM;
goto out;
}
// Read rescan subvol list.
while (subvol_id) {
struct btrfs_syno_quota_rescan_item *ptr;
struct syno_quota_rescan_ctx *ctx = fs_info->syno_quota_rescan_ctx;
u64 flags;
u64 ino;
key.objectid = 0;
key.type = BTRFS_SYNO_QUOTA_RESCAN_KEY;
key.offset = subvol_id;
ret = btrfs_search_slot(NULL, quota_root, &key, path, 0, 0);
if (ret) {
btrfs_warn(fs_info,
"Failed to read syno quota rescan item, root = %llu", subvol_id);
if (ret > 0)
ret = -ENOENT;
break;
}
slot = path->slots[0];
l = path->nodes[0];
ptr = btrfs_item_ptr(l, slot, struct btrfs_syno_quota_rescan_item);
flags = btrfs_syno_quota_rescan_flags(l, ptr);
if (!(flags & (SYNO_QUOTA_RESCAN_QUEUED | SYNO_QUOTA_RESCAN_DOING))) {
update_syno_quota_rescan_progress(fs_info->quota_root, ctx,
subvol_id, SYNO_QUOTA_PROGRESS_ADD_FINISHED);
subvol_id = btrfs_syno_quota_rescan_next_root(l, ptr);
btrfs_release_path(path);
continue;
}
ino = btrfs_syno_quota_rescan_inode(l, ptr);
ret = ulist_add(fs_info->syno_quota_rescan_subvol_ulist, subvol_id, ino, GFP_KERNEL);
if (ret != 1) {
if (ret == 0) {
btrfs_warn(fs_info, "Syno quota rescan detect duplicate items, the list is broken.");
ret = -EEXIST;
} else {
btrfs_warn(fs_info, "Syno quota rescan encounter -ENOMEM.");
ret = -ENOMEM;
}
break;
}
update_syno_quota_rescan_progress(fs_info->quota_root, ctx,
subvol_id, SYNO_QUOTA_PROGRESS_ADD_NEW);
subvol_id = btrfs_syno_quota_rescan_next_root(l, ptr);
btrfs_release_path(path);
}
btrfs_release_path(path);
pass2:
#endif /* MY_ABC_HERE */
/*
* pass 2: read all qgroup relations
*/
key.objectid = 0;
key.type = BTRFS_QGROUP_RELATION_KEY;
key.offset = 0;
ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0);
if (ret)
goto out;
while (1) {
slot = path->slots[0];
l = path->nodes[0];
btrfs_item_key_to_cpu(l, &found_key, slot);
if (found_key.type != BTRFS_QGROUP_RELATION_KEY)
goto next2;
if (found_key.objectid > found_key.offset) {
/* parent <- member, not needed to build config */
/* FIXME should we omit the key completely? */
goto next2;
}
ret = add_relation_rb(fs_info, found_key.objectid,
found_key.offset);
if (ret == -ENOENT) {
btrfs_warn(fs_info,
"orphan qgroup relation 0x%llx->0x%llx",
found_key.objectid, found_key.offset);
ret = 0; /* ignore the error */
}
if (ret)
goto out;
next2:
ret = btrfs_next_item(quota_root, path);
if (ret < 0)
goto out;
if (ret)
break;
}
out:
btrfs_free_path(path);
fs_info->qgroup_flags |= flags;
if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))
#ifdef MY_ABC_HERE
{
clear_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags);
clear_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags);
}
#else
clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
#endif /* MY_ABC_HERE */
else if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN &&
ret >= 0)
ret = qgroup_rescan_init(fs_info, rescan_progress, 0);
if (ret < 0) {
ulist_free(fs_info->qgroup_ulist);
fs_info->qgroup_ulist = NULL;
#ifdef MY_ABC_HERE
ulist_free(fs_info->syno_quota_rescan_subvol_ulist);
fs_info->syno_quota_rescan_subvol_ulist = NULL;
kfree(fs_info->syno_quota_rescan_ctx);
fs_info->syno_quota_rescan_ctx = NULL;
#endif /* MY_ABC_HERE */
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
btrfs_sysfs_del_qgroups(fs_info);
}
return ret < 0 ? ret : 0;
}
/*
* Called in close_ctree() when quota is still enabled. This verifies we don't
* leak some reserved space.
*
* Return false if no reserved space is left.
* Return true if some reserved space is leaked.
*/
bool btrfs_check_quota_leak(struct btrfs_fs_info *fs_info)
{
struct rb_node *node;
bool ret = false;
#ifdef MY_ABC_HERE
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags))
#else
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
#endif /* MY_ABC_HERE */
return ret;
/*
* Since we're unmounting, there is no race and no need to grab qgroup
* lock. And here we don't go post-order to provide a more user
* friendly sorted result.
*/
for (node = rb_first(&fs_info->qgroup_tree); node; node = rb_next(node)) {
struct btrfs_qgroup *qgroup;
int i;
qgroup = rb_entry(node, struct btrfs_qgroup, node);
for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++) {
if (qgroup->rsv.values[i]) {
ret = true;
btrfs_warn(fs_info,
"qgroup %hu/%llu has unreleased space, type %d rsv %llu",
btrfs_qgroup_level(qgroup->qgroupid),
btrfs_qgroup_subvolid(qgroup->qgroupid),
i, qgroup->rsv.values[i]);
}
}
}
return ret;
}
/*
* This is called from close_ctree() or open_ctree() or btrfs_quota_disable(),
* first two are in single-threaded paths.And for the third one, we have set
* quota_root to be null with qgroup_lock held before, so it is safe to clean
* up the in-memory structures without qgroup_lock held.
*/
void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info)
{
struct rb_node *n;
struct btrfs_qgroup *qgroup;
while ((n = rb_first(&fs_info->qgroup_tree))) {
qgroup = rb_entry(n, struct btrfs_qgroup, node);
rb_erase(n, &fs_info->qgroup_tree);
__del_qgroup_rb(fs_info, qgroup);
btrfs_sysfs_del_one_qgroup(fs_info, qgroup);
kfree(qgroup);
}
/*
* We call btrfs_free_qgroup_config() when unmounting
* filesystem and disabling quota, so we set qgroup_ulist
* to be null here to avoid double free.
*/
ulist_free(fs_info->qgroup_ulist);
fs_info->qgroup_ulist = NULL;
#ifdef MY_ABC_HERE
ulist_free(fs_info->syno_quota_rescan_subvol_ulist);
fs_info->syno_quota_rescan_subvol_ulist = NULL;
kfree(fs_info->syno_quota_rescan_ctx);
fs_info->syno_quota_rescan_ctx = NULL;
#endif /* MY_ABC_HERE */
btrfs_sysfs_del_qgroups(fs_info);
}
static int add_qgroup_relation_item(struct btrfs_trans_handle *trans, u64 src,
u64 dst)
{
int ret;
struct btrfs_root *quota_root = trans->fs_info->quota_root;
struct btrfs_path *path;
struct btrfs_key key;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = src;
key.type = BTRFS_QGROUP_RELATION_KEY;
key.offset = dst;
ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0);
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_free_path(path);
return ret;
}
static int del_qgroup_relation_item(struct btrfs_trans_handle *trans, u64 src,
u64 dst)
{
int ret;
struct btrfs_root *quota_root = trans->fs_info->quota_root;
struct btrfs_path *path;
struct btrfs_key key;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = src;
key.type = BTRFS_QGROUP_RELATION_KEY;
key.offset = dst;
ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
if (ret < 0)
goto out;
if (ret > 0) {
ret = -ENOENT;
goto out;
}
ret = btrfs_del_item(trans, quota_root, path);
out:
btrfs_free_path(path);
return ret;
}
static int add_qgroup_item(struct btrfs_trans_handle *trans,
struct btrfs_root *quota_root, u64 qgroupid)
{
int ret;
struct btrfs_path *path;
struct btrfs_qgroup_info_item *qgroup_info;
struct btrfs_qgroup_limit_item *qgroup_limit;
struct extent_buffer *leaf;
struct btrfs_key key;
if (btrfs_is_testing(quota_root->fs_info))
return 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = 0;
key.type = BTRFS_QGROUP_INFO_KEY;
key.offset = qgroupid;
/*
* Avoid a transaction abort by catching -EEXIST here. In that
* case, we proceed by re-initializing the existing structure
* on disk.
*/
ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
sizeof(*qgroup_info));
if (ret && ret != -EEXIST)
goto out;
leaf = path->nodes[0];
qgroup_info = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_qgroup_info_item);
btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid);
btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0);
btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0);
btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0);
btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0);
btrfs_mark_buffer_dirty(leaf);
btrfs_release_path(path);
key.type = BTRFS_QGROUP_LIMIT_KEY;
ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
sizeof(*qgroup_limit));
if (ret && ret != -EEXIST)
goto out;
leaf = path->nodes[0];
qgroup_limit = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_qgroup_limit_item);
btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0);
btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0);
btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0);
btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0);
btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0);
btrfs_mark_buffer_dirty(leaf);
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
static int del_qgroup_item(struct btrfs_trans_handle *trans, u64 qgroupid)
{
int ret;
struct btrfs_root *quota_root = trans->fs_info->quota_root;
struct btrfs_path *path;
struct btrfs_key key;
#ifdef MY_ABC_HERE
struct btrfs_fs_info *fs_info = trans->fs_info;
#endif /* MY_ABC_HERE */
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = 0;
key.type = BTRFS_QGROUP_INFO_KEY;
key.offset = qgroupid;
ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
if (ret < 0)
goto out;
if (ret > 0) {
ret = -ENOENT;
goto out;
}
ret = btrfs_del_item(trans, quota_root, path);
if (ret)
goto out;
btrfs_release_path(path);
key.type = BTRFS_QGROUP_LIMIT_KEY;
ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
if (ret < 0)
goto out;
if (ret > 0) {
ret = -ENOENT;
goto out;
}
ret = btrfs_del_item(trans, quota_root, path);
#ifdef MY_ABC_HERE
btrfs_release_path(path);
// Remove rescan item.
mutex_lock(&fs_info->qgroup_rescan_lock);
key.type = BTRFS_SYNO_QUOTA_RESCAN_KEY;
ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
if (ret) {
if (ret > 0)
ret = 0; // This subvol may be from quota 1.0 or vanilla kernel.
goto unlock_rescan_lock;
}
ret = btrfs_del_item(trans, quota_root, path);
unlock_rescan_lock:
mutex_unlock(&fs_info->qgroup_rescan_lock);
#endif /* MY_ABC_HERE */
out:
btrfs_free_path(path);
return ret;
}
static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
struct btrfs_qgroup *qgroup)
{
struct btrfs_root *quota_root = trans->fs_info->quota_root;
struct btrfs_path *path;
struct btrfs_key key;
struct extent_buffer *l;
struct btrfs_qgroup_limit_item *qgroup_limit;
int ret;
int slot;
key.objectid = 0;
key.type = BTRFS_QGROUP_LIMIT_KEY;
key.offset = qgroup->qgroupid;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1);
if (ret > 0)
ret = -ENOENT;
if (ret)
goto out;
l = path->nodes[0];
slot = path->slots[0];
qgroup_limit = btrfs_item_ptr(l, slot, struct btrfs_qgroup_limit_item);
btrfs_set_qgroup_limit_flags(l, qgroup_limit, qgroup->lim_flags);
btrfs_set_qgroup_limit_max_rfer(l, qgroup_limit, qgroup->max_rfer);
btrfs_set_qgroup_limit_max_excl(l, qgroup_limit, qgroup->max_excl);
btrfs_set_qgroup_limit_rsv_rfer(l, qgroup_limit, qgroup->rsv_rfer);
btrfs_set_qgroup_limit_rsv_excl(l, qgroup_limit, qgroup->rsv_excl);
btrfs_mark_buffer_dirty(l);
out:
btrfs_free_path(path);
return ret;
}
static int update_qgroup_info_item(struct btrfs_trans_handle *trans,
struct btrfs_qgroup *qgroup)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *quota_root = fs_info->quota_root;
struct btrfs_path *path;
struct btrfs_key key;
struct extent_buffer *l;
struct btrfs_qgroup_info_item *qgroup_info;
int ret;
int slot;
if (btrfs_is_testing(fs_info))
return 0;
key.objectid = 0;
key.type = BTRFS_QGROUP_INFO_KEY;
key.offset = qgroup->qgroupid;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1);
if (ret > 0)
ret = -ENOENT;
if (ret)
goto out;
l = path->nodes[0];
slot = path->slots[0];
qgroup_info = btrfs_item_ptr(l, slot, struct btrfs_qgroup_info_item);
btrfs_set_qgroup_info_generation(l, qgroup_info, trans->transid);
btrfs_set_qgroup_info_rfer(l, qgroup_info, qgroup->rfer);
btrfs_set_qgroup_info_rfer_cmpr(l, qgroup_info, qgroup->rfer_cmpr);
btrfs_set_qgroup_info_excl(l, qgroup_info, qgroup->excl);
btrfs_set_qgroup_info_excl_cmpr(l, qgroup_info, qgroup->excl_cmpr);
btrfs_mark_buffer_dirty(l);
out:
btrfs_free_path(path);
return ret;
}
static int update_qgroup_status_item(struct btrfs_trans_handle *trans)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *quota_root = fs_info->quota_root;
struct btrfs_path *path;
struct btrfs_key key;
struct extent_buffer *l;
struct btrfs_qgroup_status_item *ptr;
int ret;
int slot;
key.objectid = 0;
key.type = BTRFS_QGROUP_STATUS_KEY;
key.offset = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1);
if (ret > 0)
ret = -ENOENT;
if (ret)
goto out;
l = path->nodes[0];
slot = path->slots[0];
ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item);
btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags);
btrfs_set_qgroup_status_generation(l, ptr, trans->transid);
btrfs_set_qgroup_status_rescan(l, ptr,
fs_info->qgroup_rescan_progress.objectid);
btrfs_mark_buffer_dirty(l);
out:
btrfs_free_path(path);
return ret;
}
#ifdef MY_ABC_HERE
int btrfs_read_syno_quota_rescan_item(struct btrfs_root *quota_root, u64 subvol_id,
struct btrfs_syno_quota_rescan_item *rescan_item)
{
int ret;
struct btrfs_path *path;
struct btrfs_key key;
if (unlikely(!quota_root))
return -EINVAL;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = 0;
key.type = BTRFS_SYNO_QUOTA_RESCAN_KEY;
key.offset = subvol_id;
ret = btrfs_search_slot(NULL, quota_root, &key, path, 0, 0);
if (ret) {
if (ret > 0)
ret = -ENOENT;
goto out;
}
read_extent_buffer(path->nodes[0], rescan_item,
btrfs_item_ptr_offset(path->nodes[0], path->slots[0]), sizeof(*rescan_item));
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
// Will read tree size from btree rescan item, so rescan item must be updated before us.
static void update_syno_quota_rescan_progress(struct btrfs_root *quota_root,
struct syno_quota_rescan_ctx *ctx, u64 subvol_id,
enum syno_quota_rescan_progress_update_type type)
{
struct btrfs_syno_quota_rescan_item rescan_item;
int ret;
ret = btrfs_read_syno_quota_rescan_item(quota_root, subvol_id, &rescan_item);
if (ret) {
btrfs_warn(quota_root->fs_info, "Failed to read syno quota rescan item, id = %llu, ret = %d",
subvol_id, ret);
return;
}
switch (type) {
case SYNO_QUOTA_PROGRESS_REMOVE_SCANNING: // Same as SYNO_QUOTA_PROGRESS_FINISH_ONE.
ctx->subvol_id = 0;
ctx->total_finished_size += rescan_item.tree_size;
memset(ctx->current_path, 0, sizeof(ctx->current_path));
break;
case SYNO_QUOTA_PROGRESS_REMOVE_QUEUED:
if (ctx->total_size >= rescan_item.tree_size)
ctx->total_size -= rescan_item.tree_size;
else
WARN_ON_ONCE(1);
break;
case SYNO_QUOTA_PROGRESS_REMOVE_FINISHED:
break;
case SYNO_QUOTA_PROGRESS_ADD_NEW:
ctx->total_size += rescan_item.tree_size;
break;
case SYNO_QUOTA_PROGRESS_ADD_FINISHED:
ctx->total_size += rescan_item.tree_size;
ctx->total_finished_size += rescan_item.tree_size;
break;
case SYNO_QUOTA_PROGRESS_FINISH_ONE: // Same as SYNO_QUOTA_PROGRESS_REMOVE_SCANNING.
ctx->subvol_id = 0;
ctx->total_finished_size += rescan_item.tree_size;
memset(ctx->current_path, 0, sizeof(ctx->current_path));
break;
case SYNO_QUOTA_PROGRESS_FINISH_ALL:
WARN_ON_ONCE(ctx->total_finished_size + rescan_item.tree_size != ctx->total_size);
// Reset progress.
memset(ctx, 0, sizeof(*ctx));
break;
default:
WARN_ON_ONCE(1);
}
}
// Cannot used on new empty rescan item.
static void update_syno_quota_rescan_flags(struct extent_buffer *leaf,
struct btrfs_syno_quota_rescan_item *rescan_item, u64 flags)
{
u64 orig_flags = btrfs_syno_quota_rescan_flags(leaf, rescan_item);
switch (flags) {
case SYNO_QUOTA_RESCAN_DONE: {
// If error was found after we ran the scan, we should trigger another new scan to fix.
orig_flags &= (SYNO_QUOTA_RESCAN_ERR | SYNO_QUOTA_RESCAN_NEED);
btrfs_set_syno_quota_rescan_flags(leaf, rescan_item,
orig_flags | SYNO_QUOTA_RESCAN_DONE);
break;
}
case SYNO_QUOTA_RESCAN_QUEUED: {
if (orig_flags & SYNO_QUOTA_RESCAN_DOING) {
WARN_ON_ONCE(1);
break;
}
// Start a new scan, clear all errors.
btrfs_set_syno_quota_rescan_flags(leaf, rescan_item, SYNO_QUOTA_RESCAN_QUEUED);
break;
}
case SYNO_QUOTA_RESCAN_DOING: {
if (orig_flags & SYNO_QUOTA_RESCAN_DONE) {
WARN_ON_ONCE(1);
break;
}
orig_flags &= ~SYNO_QUOTA_RESCAN_QUEUED;
btrfs_set_syno_quota_rescan_flags(leaf, rescan_item,
orig_flags | SYNO_QUOTA_RESCAN_DOING);
break;
}
case SYNO_QUOTA_RESCAN_ERR: {
if (orig_flags & SYNO_QUOTA_RESCAN_DONE) {
WARN_ON_ONCE(1);
break;
}
btrfs_set_syno_quota_rescan_flags(leaf, rescan_item,
orig_flags | SYNO_QUOTA_RESCAN_ERR);
break;
}
case (SYNO_QUOTA_RESCAN_ERR | SYNO_QUOTA_RESCAN_DONE): {
orig_flags &= SYNO_QUOTA_RESCAN_NEED;
btrfs_set_syno_quota_rescan_flags(leaf, rescan_item,
orig_flags | SYNO_QUOTA_RESCAN_DONE | SYNO_QUOTA_RESCAN_ERR);
break;
}
case SYNO_QUOTA_RESCAN_NEED: {
btrfs_set_syno_quota_rescan_flags(leaf, rescan_item,
orig_flags | SYNO_QUOTA_RESCAN_NEED);
break;
}
default:
WARN_ON_ONCE(1);
}
}
int btrfs_add_update_syno_quota_rescan_item(struct btrfs_trans_handle *trans,
struct btrfs_root *quota_root, u64 subvol_id,
struct syno_quota_rescan_item_updater *updater)
{
int ret;
struct btrfs_path *path;
struct btrfs_syno_quota_rescan_item *rescan_item;
struct extent_buffer *leaf;
struct btrfs_key key;
if (unlikely(!quota_root))
return -EINVAL;
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &trans->fs_info->flags) &&
!updater->enable)
return -EINVAL;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = 0;
key.type = BTRFS_SYNO_QUOTA_RESCAN_KEY;
key.offset = subvol_id;
ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
sizeof(*rescan_item));
if (ret && ret != -EEXIST)
goto out;
// Insert a new item, SYNO_QUOTA_RESCAN_ITEM_SKIP is not allowed.
if (ret != -EEXIST && syno_quota_rescan_item_check(updater)) {
WARN_ON_ONCE(1);
ret = -EINVAL;
goto out;
}
leaf = path->nodes[0];
rescan_item = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_syno_quota_rescan_item);
if (updater->flags != SYNO_QUOTA_RESCAN_ITEM_SKIP) {
if (ret != -EEXIST)
btrfs_set_syno_quota_rescan_flags(leaf, rescan_item, updater->flags);
else
update_syno_quota_rescan_flags(leaf, rescan_item, updater->flags);
}
if (updater->version != SYNO_QUOTA_RESCAN_ITEM_SKIP)
btrfs_set_syno_quota_rescan_version(leaf, rescan_item, updater->version);
btrfs_set_syno_quota_rescan_generation(leaf, rescan_item, trans->transid);
if (updater->rescan_inode != SYNO_QUOTA_RESCAN_ITEM_SKIP)
btrfs_set_syno_quota_rescan_inode(leaf, rescan_item, updater->rescan_inode);
if (updater->end_inode != SYNO_QUOTA_RESCAN_ITEM_SKIP)
btrfs_set_syno_quota_rescan_end_inode(leaf, rescan_item, updater->end_inode);
if (updater->tree_size != SYNO_QUOTA_RESCAN_ITEM_SKIP)
btrfs_set_syno_quota_rescan_tree_size(leaf, rescan_item, updater->tree_size);
if (updater->next_root != SYNO_QUOTA_RESCAN_ITEM_SKIP)
btrfs_set_syno_quota_rescan_next_root(leaf, rescan_item, updater->next_root);
btrfs_mark_buffer_dirty(leaf);
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
#endif /* MY_ABC_HERE */
/*
* called with qgroup_lock held
*/
static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
struct btrfs_path *path;
struct btrfs_key key;
struct extent_buffer *leaf = NULL;
int ret;
int nr = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->leave_spinning = 1;
key.objectid = 0;
key.offset = 0;
key.type = 0;
while (1) {
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret < 0)
goto out;
leaf = path->nodes[0];
nr = btrfs_header_nritems(leaf);
if (!nr)
break;
/*
* delete the leaf one by one
* since the whole tree is going
* to be deleted.
*/
path->slots[0] = 0;
ret = btrfs_del_items(trans, root, path, 0, nr);
if (ret)
goto out;
btrfs_release_path(path);
}
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
#ifdef MY_ABC_HERE
int btrfs_quota_enable(struct btrfs_fs_info *fs_info, u64 cmd)
#else
int btrfs_quota_enable(struct btrfs_fs_info *fs_info)
#endif /* MY_ABC_HERE */
{
struct btrfs_root *quota_root;
struct btrfs_root *tree_root = fs_info->tree_root;
struct btrfs_path *path = NULL;
struct btrfs_qgroup_status_item *ptr;
struct extent_buffer *leaf;
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_qgroup *qgroup = NULL;
struct btrfs_trans_handle *trans = NULL;
struct ulist *ulist = NULL;
int ret = 0;
int slot;
#ifdef MY_ABC_HERE
// Default using v2 quota.
if (cmd == BTRFS_QUOTA_CTL_ENABLE)
cmd = BTRFS_QUOTA_V2_CTL_ENABLE;
if (btrfs_test_opt(fs_info, NO_QUOTA_TREE)) {
btrfs_info(fs_info, "Can't enable quota with mount_opt no_quota_tree");
return -EINVAL;
}
#endif /* MY_ABC_HERE */
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (fs_info->quota_root)
goto out;
ulist = ulist_alloc(GFP_KERNEL);
if (!ulist) {
ret = -ENOMEM;
goto out;
}
ret = btrfs_sysfs_add_qgroups(fs_info);
if (ret < 0)
goto out;
/*
* Unlock qgroup_ioctl_lock before starting the transaction. This is to
* avoid lock acquisition inversion problems (reported by lockdep) between
* qgroup_ioctl_lock and the vfs freeze semaphores, acquired when we
* start a transaction.
* After we started the transaction lock qgroup_ioctl_lock again and
* check if someone else created the quota root in the meanwhile. If so,
* just return success and release the transaction handle.
*
* Also we don't need to worry about someone else calling
* btrfs_sysfs_add_qgroups() after we unlock and getting an error because
* that function returns 0 (success) when the sysfs entries already exist.
*/
mutex_unlock(&fs_info->qgroup_ioctl_lock);
/*
* 1 for quota root item
* 1 for BTRFS_QGROUP_STATUS item
*
* Yet we also need 2*n items for a QGROUP_INFO/QGROUP_LIMIT items
* per subvolume. However those are not currently reserved since it
* would be a lot of overkill.
*/
trans = btrfs_start_transaction(tree_root, 2);
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
trans = NULL;
goto out;
}
if (fs_info->quota_root)
goto out;
fs_info->qgroup_ulist = ulist;
ulist = NULL;
/*
* initially create the quota tree
*/
#ifdef MY_ABC_HERE
if (cmd == BTRFS_QUOTA_V2_CTL_ENABLE)
quota_root = btrfs_create_tree(trans, BTRFS_SYNO_QUOTA_V2_TREE_OBJECTID);
else
#endif /* MY_ABC_HERE */
quota_root = btrfs_create_tree(trans, BTRFS_QUOTA_TREE_OBJECTID);
if (IS_ERR(quota_root)) {
ret = PTR_ERR(quota_root);
btrfs_abort_transaction(trans, ret);
goto out;
}
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
btrfs_abort_transaction(trans, ret);
goto out_free_root;
}
key.objectid = 0;
key.type = BTRFS_QGROUP_STATUS_KEY;
key.offset = 0;
ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
sizeof(*ptr));
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out_free_path;
}
leaf = path->nodes[0];
ptr = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_qgroup_status_item);
btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid);
#ifdef MY_ABC_HERE
if (cmd == BTRFS_QUOTA_V2_CTL_ENABLE)
btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_V2_STATUS_VERSION);
else
#endif /* MY_ABC_HERE */
btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_STATUS_VERSION);
fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON |
BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags);
btrfs_set_qgroup_status_rescan(leaf, ptr, 0);
btrfs_mark_buffer_dirty(leaf);
key.objectid = 0;
key.type = BTRFS_ROOT_REF_KEY;
key.offset = 0;
btrfs_release_path(path);
ret = btrfs_search_slot_for_read(tree_root, &key, path, 1, 0);
if (ret > 0)
goto out_add_root;
if (ret < 0) {
btrfs_abort_transaction(trans, ret);
goto out_free_path;
}
while (1) {
slot = path->slots[0];
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, slot);
if (found_key.type == BTRFS_ROOT_REF_KEY) {
/* Release locks on tree_root before we access quota_root */
btrfs_release_path(path);
ret = add_qgroup_item(trans, quota_root,
found_key.offset);
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out_free_path;
}
qgroup = add_qgroup_rb(fs_info, found_key.offset);
if (IS_ERR(qgroup)) {
ret = PTR_ERR(qgroup);
btrfs_abort_transaction(trans, ret);
goto out_free_path;
}
ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
if (ret < 0) {
btrfs_abort_transaction(trans, ret);
goto out_free_path;
}
ret = btrfs_search_slot_for_read(tree_root, &found_key,
path, 1, 0);
if (ret < 0) {
btrfs_abort_transaction(trans, ret);
goto out_free_path;
}
if (ret > 0) {
/*
* Shouldn't happen, but in case it does we
* don't need to do the btrfs_next_item, just
* continue.
*/
continue;
}
#ifdef MY_ABC_HERE
if (!ret && cmd == BTRFS_QUOTA_V2_CTL_ENABLE) {
struct syno_quota_rescan_item_updater updater;
struct btrfs_root *fs_root;
syno_quota_rescan_item_init(&updater);
updater.flags = SYNO_QUOTA_RESCAN_DONE | SYNO_QUOTA_RESCAN_NEED;
updater.version = 0; // So root->invalid_quota will be set.
updater.rescan_inode = 0;
updater.end_inode = (u64)-1;
updater.tree_size = 0;
updater.next_root = 0;
updater.enable = true;
ret = btrfs_add_update_syno_quota_rescan_item(trans, quota_root,
found_key.offset, &updater);
if (ret)
btrfs_warn(fs_info,
"Failed to create syno quota rescan item for root %llu, ret = %d",
found_key.offset, ret);
/*
* If fs root is not in memory, we set invalid_quota in
* btrfs_read_syno_quota_for_root().
*/
fs_root = btrfs_lookup_fs_root(fs_info, found_key.offset);
if (fs_root) {
fs_root->invalid_quota = true;
fs_root->rescan_inode = 0;
btrfs_put_root(fs_root);
}
ret = 0;
}
#endif /* MY_ABC_HERE */
}
ret = btrfs_next_item(tree_root, path);
if (ret < 0) {
btrfs_abort_transaction(trans, ret);
goto out_free_path;
}
if (ret)
break;
}
out_add_root:
btrfs_release_path(path);
ret = add_qgroup_item(trans, quota_root, BTRFS_FS_TREE_OBJECTID);
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out_free_path;
}
qgroup = add_qgroup_rb(fs_info, BTRFS_FS_TREE_OBJECTID);
if (IS_ERR(qgroup)) {
ret = PTR_ERR(qgroup);
btrfs_abort_transaction(trans, ret);
goto out_free_path;
}
ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
if (ret < 0) {
btrfs_abort_transaction(trans, ret);
goto out_free_path;
}
#ifdef MY_ABC_HERE
if (!ret && cmd == BTRFS_QUOTA_V2_CTL_ENABLE) {
struct syno_quota_rescan_item_updater updater;
syno_quota_rescan_item_init(&updater);
updater.flags = SYNO_QUOTA_RESCAN_DONE;
updater.version = BTRFS_QGROUP_V2_STATUS_VERSION;
updater.rescan_inode = (u64)-1;
updater.end_inode = (u64)-1;
updater.tree_size = 0;
updater.next_root = 0;
updater.enable = true;
ret = btrfs_add_update_syno_quota_rescan_item(trans, quota_root,
BTRFS_FS_TREE_OBJECTID, &updater);
if (ret)
btrfs_warn(fs_info,
"Failed to create syno quota rescan item for root 5, ret = %d", ret);
ret = 0; // No need to abort transaction, it is not that critical.
}
#endif /* MY_ABC_HERE */
ret = btrfs_commit_transaction(trans);
trans = NULL;
if (ret)
goto out_free_path;
/*
* Set quota enabled flag after committing the transaction, to avoid
* deadlocks on fs_info->qgroup_ioctl_lock with concurrent snapshot
* creation.
*/
#ifdef MY_ABC_HERE
down_write(&fs_info->inflight_reserve_lock);
#endif /* MY_ABC_HERE */
spin_lock(&fs_info->qgroup_lock);
fs_info->quota_root = quota_root;
#ifdef MY_ABC_HERE
if (cmd == BTRFS_QUOTA_V1_CTL_ENABLE)
set_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags);
else
set_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags);
#else
set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
#endif /* MY_ABC_HERE */
spin_unlock(&fs_info->qgroup_lock);
#ifdef MY_ABC_HERE
up_write(&fs_info->inflight_reserve_lock);
#endif /* MY_ABC_HERE */
#ifdef MY_ABC_HERE
#else
ret = qgroup_rescan_init(fs_info, 0, 1);
if (!ret) {
qgroup_rescan_zero_tracking(fs_info);
fs_info->qgroup_rescan_running = true;
btrfs_queue_work(fs_info->qgroup_rescan_workers,
&fs_info->qgroup_rescan_work);
}
#endif /* MY_ABC_HERE */
out_free_path:
btrfs_free_path(path);
out_free_root:
if (ret)
btrfs_put_root(quota_root);
out:
if (ret) {
ulist_free(fs_info->qgroup_ulist);
fs_info->qgroup_ulist = NULL;
btrfs_sysfs_del_qgroups(fs_info);
}
mutex_unlock(&fs_info->qgroup_ioctl_lock);
if (ret && trans)
btrfs_end_transaction(trans);
else if (trans)
ret = btrfs_end_transaction(trans);
ulist_free(ulist);
return ret;
}
int btrfs_quota_disable(struct btrfs_fs_info *fs_info)
{
struct btrfs_root *quota_root;
struct btrfs_trans_handle *trans = NULL;
int ret = 0;
#ifdef MY_ABC_HERE
/*
* Protected by fs_info->subvol_sem, so user quota will not do enable
* before we finish qgroup disable.
*/
if (test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) ||
test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags)) {
btrfs_warn(fs_info,
"Should disable user quota before disable qgroup.");
return -EINVAL;
}
#endif /* MY_ABC_HERE */
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (!fs_info->quota_root)
goto out;
mutex_unlock(&fs_info->qgroup_ioctl_lock);
/*
* 1 For the root item
*
* We should also reserve enough items for the quota tree deletion in
* btrfs_clean_quota_tree but this is not done.
*
* Also, we must always start a transaction without holding the mutex
* qgroup_ioctl_lock, see btrfs_quota_enable().
*/
trans = btrfs_start_transaction(fs_info->tree_root, 1);
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
trans = NULL;
goto out;
}
if (!fs_info->quota_root)
goto out;
#ifdef MY_ABC_HERE
fs_info->need_clear_reserve = true;
smp_wmb();
clear_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags);
clear_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags);
#else
clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
#endif /* MY_ABC_HERE */
btrfs_qgroup_wait_for_completion(fs_info, false);
spin_lock(&fs_info->qgroup_lock);
quota_root = fs_info->quota_root;
fs_info->quota_root = NULL;
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
spin_unlock(&fs_info->qgroup_lock);
btrfs_free_qgroup_config(fs_info);
ret = btrfs_clean_quota_tree(trans, quota_root);
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out;
}
ret = btrfs_del_root(trans, &quota_root->root_key);
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out;
}
list_del(&quota_root->dirty_list);
btrfs_tree_lock(quota_root->node);
btrfs_clean_tree_block(quota_root->node);
btrfs_tree_unlock(quota_root->node);
btrfs_free_tree_block(trans, quota_root, quota_root->node, 0, 1);
btrfs_put_root(quota_root);
#ifdef MY_ABC_HERE
ret = btrfs_end_transaction(trans);
trans = NULL;
btrfs_start_delalloc_roots(fs_info, U64_MAX, false);
btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
fs_info->need_clear_reserve = false;
#endif /* MY_ABC_HERE */
out:
mutex_unlock(&fs_info->qgroup_ioctl_lock);
if (ret && trans)
btrfs_end_transaction(trans);
else if (trans)
ret = btrfs_end_transaction(trans);
return ret;
}
#ifdef MY_ABC_HERE
int btrfs_quota_unload(struct btrfs_fs_info *fs_info)
{
struct btrfs_root *quota_root;
struct btrfs_trans_handle *trans = NULL;
int ret = 0;
/*
* Protected by fs_info->subvol_sem, so user quota will not do enable
* before we finish qgroup disable.
*/
if (test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) ||
test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags)) {
btrfs_warn(fs_info,
"Should disable user quota before disable qgroup.");
return -EINVAL;
}
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (!fs_info->quota_root)
goto out;
mutex_unlock(&fs_info->qgroup_ioctl_lock);
/*
* 1 For the root item
*
* We should also reserve enough items for the quota tree deletion in
* btrfs_clean_quota_tree but this is not done.
*
* Also, we must always start a transaction without holding the mutex
* qgroup_ioctl_lock, see btrfs_quota_enable().
*/
trans = btrfs_start_transaction(fs_info->tree_root, 1);
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
trans = NULL;
goto out;
}
if (!fs_info->quota_root)
goto out;
fs_info->need_clear_reserve = true;
smp_wmb();
clear_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags);
clear_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags);
btrfs_qgroup_wait_for_completion(fs_info, false);
spin_lock(&fs_info->qgroup_lock);
quota_root = fs_info->quota_root;
fs_info->quota_root = NULL;
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
spin_unlock(&fs_info->qgroup_lock);
btrfs_free_qgroup_config(fs_info);
btrfs_start_delalloc_roots(fs_info, U64_MAX, false);
btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
fs_info->need_clear_reserve = false;
ret = btrfs_commit_transaction(trans);
trans = NULL;
list_del(&quota_root->dirty_list);
btrfs_put_root(quota_root);
out:
mutex_unlock(&fs_info->qgroup_ioctl_lock);
if (ret && trans)
btrfs_end_transaction(trans);
else if (trans)
ret = btrfs_end_transaction(trans);
return ret;
}
int btrfs_quota_remove_v1(struct btrfs_fs_info *fs_info)
{
struct btrfs_root *tree_root = fs_info->tree_root;
struct btrfs_root *root;
struct btrfs_trans_handle *trans = NULL;
struct btrfs_path *path = NULL;
struct btrfs_key location;
int ret = 0;
int nr;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
// Read old qgroup root.
location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
location.type = BTRFS_ROOT_ITEM_KEY;
location.offset = 0;
root = btrfs_read_tree_root(tree_root, &location);
if (IS_ERR(root)) {
ret = PTR_ERR(root);
goto out;
}
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
location.objectid = 0;
location.offset = 0;
location.type = 0;
while (1) {
trans = btrfs_start_transaction(tree_root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
trans = NULL;
goto free_root;
}
ret = btrfs_search_slot(trans, root, &location, path, -1, 1);
if (ret < 0)
goto free_root;
nr = btrfs_header_nritems(path->nodes[0]);
if (!nr)
break;
path->slots[0] = 0;
ret = btrfs_del_items(trans, root, path, 0, nr);
if (ret)
goto free_root;
btrfs_release_path(path);
btrfs_end_transaction_throttle(trans);
trans = NULL;
cond_resched();
}
btrfs_release_path(path);
// Remove root item from root tree.
ret = btrfs_del_root(trans, &root->root_key);
free_root:
btrfs_release_path(path);
list_del(&root->dirty_list);
btrfs_tree_lock(root->node);
btrfs_clean_tree_block(root->node);
btrfs_tree_unlock(root->node);
btrfs_free_tree_block(trans, root, root->node, 0, 1);
free_extent_buffer(root->node);
free_extent_buffer(root->commit_root);
kfree(root);
if (trans) {
if (!ret)
ret = btrfs_commit_transaction(trans);
else
btrfs_end_transaction(trans);
}
out:
btrfs_free_path(path);
return ret;
}
#endif /* MY_ABC_HERE */
static void qgroup_dirty(struct btrfs_fs_info *fs_info,
struct btrfs_qgroup *qgroup)
{
if (list_empty(&qgroup->dirty))
list_add(&qgroup->dirty, &fs_info->dirty_qgroups);
}
/*
* The easy accounting, we're updating qgroup relationship whose child qgroup
* only has exclusive extents.
*
* In this case, all exclusive extents will also be exclusive for parent, so
* excl/rfer just get added/removed.
*
* So is qgroup reservation space, which should also be added/removed to
* parent.
* Or when child tries to release reservation space, parent will underflow its
* reservation (for relationship adding case).
*
* Caller should hold fs_info->qgroup_lock.
*/
#ifdef MY_ABC_HERE
#else
static int __qgroup_excl_accounting(struct btrfs_fs_info *fs_info,
struct ulist *tmp, u64 ref_root,
struct btrfs_qgroup *src, int sign)
{
struct btrfs_qgroup *qgroup;
struct btrfs_qgroup_list *glist;
struct ulist_node *unode;
struct ulist_iterator uiter;
u64 num_bytes = src->excl;
int ret = 0;
qgroup = find_qgroup_rb(fs_info, ref_root);
if (!qgroup)
goto out;
qgroup->rfer += sign * num_bytes;
qgroup->rfer_cmpr += sign * num_bytes;
WARN_ON(sign < 0 && qgroup->excl < num_bytes);
qgroup->excl += sign * num_bytes;
qgroup->excl_cmpr += sign * num_bytes;
if (sign > 0)
qgroup_rsv_add_by_qgroup(fs_info, qgroup, src);
else
qgroup_rsv_release_by_qgroup(fs_info, qgroup, src);
qgroup_dirty(fs_info, qgroup);
/* Get all of the parent groups that contain this qgroup */
list_for_each_entry(glist, &qgroup->groups, next_group) {
ret = ulist_add(tmp, glist->group->qgroupid,
qgroup_to_aux(glist->group), GFP_ATOMIC);
if (ret < 0)
goto out;
}
/* Iterate all of the parents and adjust their reference counts */
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(tmp, &uiter))) {
qgroup = unode_aux_to_qgroup(unode);
qgroup->rfer += sign * num_bytes;
qgroup->rfer_cmpr += sign * num_bytes;
WARN_ON(sign < 0 && qgroup->excl < num_bytes);
qgroup->excl += sign * num_bytes;
if (sign > 0)
qgroup_rsv_add_by_qgroup(fs_info, qgroup, src);
else
qgroup_rsv_release_by_qgroup(fs_info, qgroup, src);
qgroup->excl_cmpr += sign * num_bytes;
qgroup_dirty(fs_info, qgroup);
/* Add any parents of the parents */
list_for_each_entry(glist, &qgroup->groups, next_group) {
ret = ulist_add(tmp, glist->group->qgroupid,
qgroup_to_aux(glist->group), GFP_ATOMIC);
if (ret < 0)
goto out;
}
}
ret = 0;
out:
return ret;
}
#endif /* MY_ABC_HERE */
/*
* Quick path for updating qgroup with only excl refs.
*
* In that case, just update all parent will be enough.
* Or we needs to do a full rescan.
* Caller should also hold fs_info->qgroup_lock.
*
* Return 0 for quick update, return >0 for need to full rescan
* and mark INCONSISTENT flag.
* Return < 0 for other error.
*/
static int quick_update_accounting(struct btrfs_fs_info *fs_info,
struct ulist *tmp, u64 src, u64 dst,
int sign)
{
#ifdef MY_ABC_HERE
return 0;
#else
struct btrfs_qgroup *qgroup;
int ret = 1;
int err = 0;
qgroup = find_qgroup_rb(fs_info, src);
if (!qgroup)
goto out;
if (qgroup->excl == qgroup->rfer) {
ret = 0;
err = __qgroup_excl_accounting(fs_info, tmp, dst,
qgroup, sign);
if (err < 0) {
ret = err;
goto out;
}
}
out:
if (ret)
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
return ret;
#endif /* MY_ABC_HERE */
}
int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
u64 dst)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_qgroup *parent;
struct btrfs_qgroup *member;
struct btrfs_qgroup_list *list;
struct ulist *tmp;
unsigned int nofs_flag;
int ret = 0;
/* Check the level of src and dst first */
if (btrfs_qgroup_level(src) >= btrfs_qgroup_level(dst))
return -EINVAL;
/* We hold a transaction handle open, must do a NOFS allocation. */
nofs_flag = memalloc_nofs_save();
tmp = ulist_alloc(GFP_KERNEL);
memalloc_nofs_restore(nofs_flag);
if (!tmp)
return -ENOMEM;
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (!fs_info->quota_root) {
#ifdef MY_ABC_HERE
ret = -ESRCH;
#else
ret = -ENOTCONN;
#endif /* MY_ABC_HERE */
goto out;
}
member = find_qgroup_rb(fs_info, src);
parent = find_qgroup_rb(fs_info, dst);
if (!member || !parent) {
ret = -EINVAL;
goto out;
}
/* check if such qgroup relation exist firstly */
list_for_each_entry(list, &member->groups, next_group) {
if (list->group == parent) {
ret = -EEXIST;
goto out;
}
}
ret = add_qgroup_relation_item(trans, src, dst);
if (ret)
goto out;
ret = add_qgroup_relation_item(trans, dst, src);
if (ret) {
del_qgroup_relation_item(trans, src, dst);
goto out;
}
spin_lock(&fs_info->qgroup_lock);
ret = add_relation_rb(fs_info, src, dst);
if (ret < 0) {
spin_unlock(&fs_info->qgroup_lock);
goto out;
}
ret = quick_update_accounting(fs_info, tmp, src, dst, 1);
spin_unlock(&fs_info->qgroup_lock);
out:
mutex_unlock(&fs_info->qgroup_ioctl_lock);
ulist_free(tmp);
return ret;
}
static int __del_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
u64 dst)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_qgroup *parent;
struct btrfs_qgroup *member;
struct btrfs_qgroup_list *list;
struct ulist *tmp;
bool found = false;
unsigned int nofs_flag;
int ret = 0;
int ret2;
/* We hold a transaction handle open, must do a NOFS allocation. */
nofs_flag = memalloc_nofs_save();
tmp = ulist_alloc(GFP_KERNEL);
memalloc_nofs_restore(nofs_flag);
if (!tmp)
return -ENOMEM;
if (!fs_info->quota_root) {
ret = -ENOTCONN;
goto out;
}
member = find_qgroup_rb(fs_info, src);
parent = find_qgroup_rb(fs_info, dst);
/*
* The parent/member pair doesn't exist, then try to delete the dead
* relation items only.
*/
if (!member || !parent)
goto delete_item;
/* check if such qgroup relation exist firstly */
list_for_each_entry(list, &member->groups, next_group) {
if (list->group == parent) {
found = true;
break;
}
}
delete_item:
ret = del_qgroup_relation_item(trans, src, dst);
if (ret < 0 && ret != -ENOENT)
goto out;
ret2 = del_qgroup_relation_item(trans, dst, src);
if (ret2 < 0 && ret2 != -ENOENT)
goto out;
/* At least one deletion succeeded, return 0 */
if (!ret || !ret2)
ret = 0;
if (found) {
spin_lock(&fs_info->qgroup_lock);
del_relation_rb(fs_info, src, dst);
ret = quick_update_accounting(fs_info, tmp, src, dst, -1);
spin_unlock(&fs_info->qgroup_lock);
}
out:
ulist_free(tmp);
return ret;
}
int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
u64 dst)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
int ret = 0;
mutex_lock(&fs_info->qgroup_ioctl_lock);
ret = __del_qgroup_relation(trans, src, dst);
mutex_unlock(&fs_info->qgroup_ioctl_lock);
return ret;
}
int btrfs_create_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *quota_root;
struct btrfs_qgroup *qgroup;
int ret = 0;
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (!fs_info->quota_root) {
#ifdef MY_ABC_HERE
ret = -ESRCH;
#else
ret = -ENOTCONN;
#endif /* MY_ABC_HERE */
goto out;
}
quota_root = fs_info->quota_root;
qgroup = find_qgroup_rb(fs_info, qgroupid);
if (qgroup) {
ret = -EEXIST;
goto out;
}
ret = add_qgroup_item(trans, quota_root, qgroupid);
if (ret)
goto out;
spin_lock(&fs_info->qgroup_lock);
qgroup = add_qgroup_rb(fs_info, qgroupid);
spin_unlock(&fs_info->qgroup_lock);
if (IS_ERR(qgroup)) {
ret = PTR_ERR(qgroup);
goto out;
}
ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
out:
mutex_unlock(&fs_info->qgroup_ioctl_lock);
return ret;
}
#ifdef MY_ABC_HERE
/*
* struct btrfs_ioctl_qgroup_query_args should be initialized to zero
*/
int btrfs_qgroup_query(struct btrfs_root *root,
struct btrfs_ioctl_qgroup_query_args *qqa)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_qgroup *qgroup;
u64 qgroupid = root->root_key.objectid;
int ret;
#ifdef MY_ABC_HERE
if (unlikely(root->invalid_quota))
return -ESRCH;
#endif /* MY_ABC_HERE */
mutex_lock(&fs_info->qgroup_ioctl_lock);
#ifdef MY_ABC_HERE
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags)) {
#else
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
#endif /* MY_ABC_HERE */
ret = -ESRCH;
goto unlock;
}
qgroup = find_qgroup_rb(fs_info, qgroupid);
if (!qgroup) {
ret = -ENOENT;
goto unlock;
}
qqa->rfer = qgroup->rfer;
qqa->rfer_cmpr = qgroup->rfer_cmpr;
qqa->excl = qgroup->excl;
qqa->excl_cmpr = qgroup->excl_cmpr;
if (qgroup->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER)
qqa->max_rfer = qgroup->max_rfer;
if (qgroup->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL)
qqa->max_excl = qgroup->max_excl;
if (qgroup->lim_flags & BTRFS_QGROUP_LIMIT_RSV_RFER)
qqa->rsv_rfer = qgroup->rsv_rfer;
if (qgroup->lim_flags & BTRFS_QGROUP_LIMIT_RSV_EXCL)
qqa->rsv_excl = qgroup->rsv_excl;
qqa->reserved = qgroup->rsv.values[BTRFS_QGROUP_RSV_DATA];
ret = 0;
unlock:
mutex_unlock(&fs_info->qgroup_ioctl_lock);
return ret;
}
#endif /* MY_ABC_HERE */
#ifdef MY_ABC_HERE
// We will remove rescan item later in del_qgroup_item().
void btrfs_remove_queued_syno_rescan(struct btrfs_trans_handle *trans, u64 subvol_id)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct syno_quota_rescan_ctx *ctx = fs_info->syno_quota_rescan_ctx;
struct ulist *ulist = fs_info->syno_quota_rescan_subvol_ulist;
struct ulist_node *node;
if (!fs_info->quota_root || !ctx || !ulist)
return;
mutex_lock(&fs_info->qgroup_rescan_lock);
node = ulist_search(ulist, subvol_id);
if (node) {
struct ulist_node *prev_node = NULL;
struct ulist_node *next_node = NULL;
u64 prev_subvol_id = 0;
u64 next_subvol_id = 0;
int ret;
if (node->list.prev != &ulist->nodes) {
prev_node = list_entry(node->list.prev, struct ulist_node, list);
prev_subvol_id = prev_node->val;
}
if (node->list.next != &ulist->nodes) {
next_node = list_entry(node->list.next, struct ulist_node, list);
next_subvol_id = next_node->val;
}
if (prev_subvol_id) {
struct syno_quota_rescan_item_updater updater;
syno_quota_rescan_item_init(&updater);
updater.next_root = (next_subvol_id)? next_subvol_id : 0;
ret = btrfs_add_update_syno_quota_rescan_item(trans, fs_info->quota_root,
prev_subvol_id, &updater);
if (ret)
btrfs_warn(fs_info,
"Failed to update syno quota rescan item, id = %llu, ret = %d.",
prev_subvol_id, ret);
}
if (fs_info->qgroup_rescan_progress.objectid == subvol_id)
fs_info->qgroup_rescan_progress.objectid = next_subvol_id;
ulist_del(ulist, subvol_id, node->aux);
// Update progress info.
if (!fs_info->qgroup_rescan_progress.objectid) { // No next subvol. All rescan are done.
update_syno_quota_rescan_progress(fs_info->quota_root, ctx,
subvol_id, SYNO_QUOTA_PROGRESS_FINISH_ALL);
fs_info->qgroup_rescan_progress.objectid = 0;
} else if (ctx->subvol_id == subvol_id) // We are removing the current scanning subvol.
update_syno_quota_rescan_progress(fs_info->quota_root, ctx,
subvol_id, SYNO_QUOTA_PROGRESS_FINISH_ONE);
else // We are removing a queued subvol.
update_syno_quota_rescan_progress(fs_info->quota_root, ctx,
subvol_id, SYNO_QUOTA_PROGRESS_REMOVE_QUEUED);
}
mutex_unlock(&fs_info->qgroup_rescan_lock);
return;
}
#endif /* MY_ABC_HERE */
int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_qgroup *qgroup;
struct btrfs_qgroup_list *list;
int ret = 0;
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (!fs_info->quota_root) {
#ifdef MY_ABC_HERE
ret = -ESRCH;
#else
ret = -ENOTCONN;
#endif /* MY_ABC_HERE */
goto out;
}
qgroup = find_qgroup_rb(fs_info, qgroupid);
if (!qgroup) {
ret = -ENOENT;
goto out;
}
/* Check if there are no children of this qgroup */
if (!list_empty(&qgroup->members)) {
ret = -EBUSY;
goto out;
}
#ifdef MY_ABC_HERE
btrfs_remove_queued_syno_rescan(trans, qgroupid);
#endif /* MY_ABC_HERE */
ret = del_qgroup_item(trans, qgroupid);
if (ret && ret != -ENOENT)
goto out;
while (!list_empty(&qgroup->groups)) {
list = list_first_entry(&qgroup->groups,
struct btrfs_qgroup_list, next_group);
ret = __del_qgroup_relation(trans, qgroupid,
list->group->qgroupid);
if (ret)
goto out;
}
spin_lock(&fs_info->qgroup_lock);
del_qgroup_rb(fs_info, qgroupid);
spin_unlock(&fs_info->qgroup_lock);
/*
* Remove the qgroup from sysfs now without holding the qgroup_lock
* spinlock, since the sysfs_remove_group() function needs to take
* the mutex kernfs_mutex through kernfs_remove_by_name_ns().
*/
btrfs_sysfs_del_one_qgroup(fs_info, qgroup);
kfree(qgroup);
out:
mutex_unlock(&fs_info->qgroup_ioctl_lock);
return ret;
}
int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid,
struct btrfs_qgroup_limit *limit)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_qgroup *qgroup;
int ret = 0;
#ifdef MY_ABC_HERE
struct btrfs_root *root = trans->root;
bool has_limit = false;
#endif /* MY_ABC_HERE */
/* Sometimes we would want to clear the limit on this qgroup.
* To meet this requirement, we treat the -1 as a special value
* which tell kernel to clear the limit on this qgroup.
*/
const u64 CLEAR_VALUE = -1;
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (!fs_info->quota_root) {
#ifdef MY_ABC_HERE
ret = -ESRCH;
#else
ret = -ENOTCONN;
#endif /* MY_ABC_HERE */
goto out;
}
qgroup = find_qgroup_rb(fs_info, qgroupid);
if (!qgroup) {
ret = -ENOENT;
goto out;
}
spin_lock(&fs_info->qgroup_lock);
#ifdef MY_ABC_HERE
if (!limit->flags) {
qgroup->lim_flags = limit->flags;
qgroup->max_rfer = limit->max_rfer;
qgroup->max_excl = limit->max_excl;
qgroup->rsv_rfer = limit->rsv_rfer;
qgroup->rsv_excl = limit->rsv_excl;
}
#endif /* MY_ABC_HERE */
if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_RFER) {
if (limit->max_rfer == CLEAR_VALUE) {
qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
qgroup->max_rfer = 0;
} else {
qgroup->max_rfer = limit->max_rfer;
}
}
if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) {
if (limit->max_excl == CLEAR_VALUE) {
qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
qgroup->max_excl = 0;
} else {
qgroup->max_excl = limit->max_excl;
}
}
if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_RFER) {
if (limit->rsv_rfer == CLEAR_VALUE) {
qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
qgroup->rsv_rfer = 0;
} else {
qgroup->rsv_rfer = limit->rsv_rfer;
}
}
if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_EXCL) {
if (limit->rsv_excl == CLEAR_VALUE) {
qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
qgroup->rsv_excl = 0;
} else {
qgroup->rsv_excl = limit->rsv_excl;
}
}
qgroup->lim_flags |= limit->flags;
#ifdef MY_ABC_HERE
if ((qgroup->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER && qgroup->max_rfer) ||
(qgroup->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL && qgroup->max_excl))
has_limit = true;
btrfs_root_set_has_quota_limit(root, has_limit);
#endif /* MY_ABC_HERE */
spin_unlock(&fs_info->qgroup_lock);
ret = update_qgroup_limit_item(trans, qgroup);
if (ret) {
#ifdef MY_ABC_HERE
#else
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
#endif /* MY_ABC_HERE */
btrfs_info(fs_info, "unable to update quota limit for %llu",
qgroupid);
}
out:
mutex_unlock(&fs_info->qgroup_ioctl_lock);
return ret;
}
#ifdef MY_ABC_HERE
int btrfs_insert_quota_record(struct btrfs_trans_handle *trans,
struct btrfs_delayed_ref_node *node)
{
struct btrfs_delayed_data_ref *ref;
struct btrfs_transaction *cur_trans = trans->transaction;
struct btrfs_quota_account_rec *record;
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &trans->fs_info->flags))
return 0;
ref = btrfs_delayed_node_to_data_ref(node);
if (ref->skip_qgroup)
return 0;
record = kzalloc(sizeof(*record), GFP_NOFS);
if (!record)
return -ENOMEM;
record->ref_root = ref->root;
record->num_bytes = node->num_bytes;
record->ram_bytes = ref->ram_bytes;
record->reserved = ref->reserved;
record->uid = ref->uid;
if (node->action == BTRFS_DROP_DELAYED_REF)
record->sign = -1;
else
record->sign = 1;
record->inode = ref->inode;
syno_usrquota_inode_get(record->inode);
spin_lock(&cur_trans->quota_account_lock);
list_add_tail(&record->list, &cur_trans->quota_account_list);
spin_unlock(&cur_trans->quota_account_lock);
return 0;
}
void btrfs_quota_syno_v1_accounting(struct btrfs_trans_handle *trans)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_quota_account_rec *record;
struct btrfs_transaction *cur_trans = trans->transaction;
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags)) {
WARN_ON(!list_empty(&cur_trans->quota_account_list));
return;
}
while (1) {
spin_lock(&cur_trans->quota_account_lock);
if (list_empty(&cur_trans->quota_account_list)) {
spin_unlock(&cur_trans->quota_account_lock);
break;
}
record = list_first_entry(&cur_trans->quota_account_list,
struct btrfs_quota_account_rec, list);
list_del_init(&record->list);
spin_unlock(&cur_trans->quota_account_lock);
if (!trans->aborted) {
btrfs_qgroup_syno_v1_accounting(fs_info, record);
btrfs_usrquota_syno_v1_accounting(trans, record);
}
syno_usrquota_inode_put(record->inode);
kfree(record);
}
return;
}
#else
int btrfs_qgroup_trace_extent_nolock(struct btrfs_fs_info *fs_info,
struct btrfs_delayed_ref_root *delayed_refs,
struct btrfs_qgroup_extent_record *record)
{
struct rb_node **p = &delayed_refs->dirty_extent_root.rb_node;
struct rb_node *parent_node = NULL;
struct btrfs_qgroup_extent_record *entry;
u64 bytenr = record->bytenr;
lockdep_assert_held(&delayed_refs->lock);
trace_btrfs_qgroup_trace_extent(fs_info, record);
while (*p) {
parent_node = *p;
entry = rb_entry(parent_node, struct btrfs_qgroup_extent_record,
node);
if (bytenr < entry->bytenr) {
p = &(*p)->rb_left;
} else if (bytenr > entry->bytenr) {
p = &(*p)->rb_right;
} else {
if (record->data_rsv && !entry->data_rsv) {
entry->data_rsv = record->data_rsv;
entry->data_rsv_refroot =
record->data_rsv_refroot;
}
return 1;
}
}
rb_link_node(&record->node, parent_node, p);
rb_insert_color(&record->node, &delayed_refs->dirty_extent_root);
return 0;
}
int btrfs_qgroup_trace_extent_post(struct btrfs_fs_info *fs_info,
struct btrfs_qgroup_extent_record *qrecord)
{
struct ulist *old_root;
u64 bytenr = qrecord->bytenr;
int ret;
ret = btrfs_find_all_roots(NULL, fs_info, bytenr, 0, &old_root, false);
if (ret < 0) {
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
btrfs_warn(fs_info,
"error accounting new delayed refs extent (err code: %d), quota inconsistent",
ret);
return 0;
}
/*
* Here we don't need to get the lock of
* trans->transaction->delayed_refs, since inserted qrecord won't
* be deleted, only qrecord->node may be modified (new qrecord insert)
*
* So modifying qrecord->old_roots is safe here
*/
qrecord->old_roots = old_root;
return 0;
}
int btrfs_qgroup_trace_extent(struct btrfs_trans_handle *trans, u64 bytenr,
u64 num_bytes, gfp_t gfp_flag)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_qgroup_extent_record *record;
struct btrfs_delayed_ref_root *delayed_refs;
int ret;
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)
|| bytenr == 0 || num_bytes == 0)
return 0;
record = kzalloc(sizeof(*record), gfp_flag);
if (!record)
return -ENOMEM;
delayed_refs = &trans->transaction->delayed_refs;
record->bytenr = bytenr;
record->num_bytes = num_bytes;
record->old_roots = NULL;
spin_lock(&delayed_refs->lock);
ret = btrfs_qgroup_trace_extent_nolock(fs_info, delayed_refs, record);
spin_unlock(&delayed_refs->lock);
if (ret > 0) {
kfree(record);
return 0;
}
return btrfs_qgroup_trace_extent_post(fs_info, record);
}
int btrfs_qgroup_trace_leaf_items(struct btrfs_trans_handle *trans,
struct extent_buffer *eb)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
int nr = btrfs_header_nritems(eb);
int i, extent_type, ret;
struct btrfs_key key;
struct btrfs_file_extent_item *fi;
u64 bytenr, num_bytes;
/* We can be called directly from walk_up_proc() */
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
return 0;
for (i = 0; i < nr; i++) {
btrfs_item_key_to_cpu(eb, &key, i);
if (key.type != BTRFS_EXTENT_DATA_KEY)
continue;
fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item);
/* filter out non qgroup-accountable extents */
extent_type = btrfs_file_extent_type(eb, fi);
if (extent_type == BTRFS_FILE_EXTENT_INLINE)
continue;
bytenr = btrfs_file_extent_disk_bytenr(eb, fi);
if (!bytenr)
continue;
num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi);
ret = btrfs_qgroup_trace_extent(trans, bytenr, num_bytes,
GFP_NOFS);
if (ret)
return ret;
}
cond_resched();
return 0;
}
/*
* Walk up the tree from the bottom, freeing leaves and any interior
* nodes which have had all slots visited. If a node (leaf or
* interior) is freed, the node above it will have it's slot
* incremented. The root node will never be freed.
*
* At the end of this function, we should have a path which has all
* slots incremented to the next position for a search. If we need to
* read a new node it will be NULL and the node above it will have the
* correct slot selected for a later read.
*
* If we increment the root nodes slot counter past the number of
* elements, 1 is returned to signal completion of the search.
*/
static int adjust_slots_upwards(struct btrfs_path *path, int root_level)
{
int level = 0;
int nr, slot;
struct extent_buffer *eb;
if (root_level == 0)
return 1;
while (level <= root_level) {
eb = path->nodes[level];
nr = btrfs_header_nritems(eb);
path->slots[level]++;
slot = path->slots[level];
if (slot >= nr || level == 0) {
/*
* Don't free the root - we will detect this
* condition after our loop and return a
* positive value for caller to stop walking the tree.
*/
if (level != root_level) {
btrfs_tree_unlock_rw(eb, path->locks[level]);
path->locks[level] = 0;
free_extent_buffer(eb);
path->nodes[level] = NULL;
path->slots[level] = 0;
}
} else {
/*
* We have a valid slot to walk back down
* from. Stop here so caller can process these
* new nodes.
*/
break;
}
level++;
}
eb = path->nodes[root_level];
if (path->slots[root_level] >= btrfs_header_nritems(eb))
return 1;
return 0;
}
/*
* Helper function to trace a subtree tree block swap.
*
* The swap will happen in highest tree block, but there may be a lot of
* tree blocks involved.
*
* For example:
* OO = Old tree blocks
* NN = New tree blocks allocated during balance
*
* File tree (257) Reloc tree for 257
* L2 OO NN
* / \ / \
* L1 OO OO (a) OO NN (a)
* / \ / \ / \ / \
* L0 OO OO OO OO OO OO NN NN
* (b) (c) (b) (c)
*
* When calling qgroup_trace_extent_swap(), we will pass:
* @src_eb = OO(a)
* @dst_path = [ nodes[1] = NN(a), nodes[0] = NN(c) ]
* @dst_level = 0
* @root_level = 1
*
* In that case, qgroup_trace_extent_swap() will search from OO(a) to
* reach OO(c), then mark both OO(c) and NN(c) as qgroup dirty.
*
* The main work of qgroup_trace_extent_swap() can be split into 3 parts:
*
* 1) Tree search from @src_eb
* It should acts as a simplified btrfs_search_slot().
* The key for search can be extracted from @dst_path->nodes[dst_level]
* (first key).
*
* 2) Mark the final tree blocks in @src_path and @dst_path qgroup dirty
* NOTE: In above case, OO(a) and NN(a) won't be marked qgroup dirty.
* They should be marked during previous (@dst_level = 1) iteration.
*
* 3) Mark file extents in leaves dirty
* We don't have good way to pick out new file extents only.
* So we still follow the old method by scanning all file extents in
* the leave.
*
* This function can free us from keeping two paths, thus later we only need
* to care about how to iterate all new tree blocks in reloc tree.
*/
static int qgroup_trace_extent_swap(struct btrfs_trans_handle* trans,
struct extent_buffer *src_eb,
struct btrfs_path *dst_path,
int dst_level, int root_level,
bool trace_leaf)
{
struct btrfs_key key;
struct btrfs_path *src_path;
struct btrfs_fs_info *fs_info = trans->fs_info;
u32 nodesize = fs_info->nodesize;
int cur_level = root_level;
int ret;
BUG_ON(dst_level > root_level);
/* Level mismatch */
if (btrfs_header_level(src_eb) != root_level)
return -EINVAL;
src_path = btrfs_alloc_path();
if (!src_path) {
ret = -ENOMEM;
goto out;
}
if (dst_level)
btrfs_node_key_to_cpu(dst_path->nodes[dst_level], &key, 0);
else
btrfs_item_key_to_cpu(dst_path->nodes[dst_level], &key, 0);
/* For src_path */
atomic_inc(&src_eb->refs);
src_path->nodes[root_level] = src_eb;
src_path->slots[root_level] = dst_path->slots[root_level];
src_path->locks[root_level] = 0;
/* A simplified version of btrfs_search_slot() */
while (cur_level >= dst_level) {
struct btrfs_key src_key;
struct btrfs_key dst_key;
if (src_path->nodes[cur_level] == NULL) {
struct btrfs_key first_key;
struct extent_buffer *eb;
int parent_slot;
u64 child_gen;
u64 child_bytenr;
eb = src_path->nodes[cur_level + 1];
parent_slot = src_path->slots[cur_level + 1];
child_bytenr = btrfs_node_blockptr(eb, parent_slot);
child_gen = btrfs_node_ptr_generation(eb, parent_slot);
btrfs_node_key_to_cpu(eb, &first_key, parent_slot);
eb = read_tree_block(fs_info, child_bytenr, child_gen,
cur_level, &first_key);
if (IS_ERR(eb)) {
ret = PTR_ERR(eb);
goto out;
} else if (!extent_buffer_uptodate(eb)) {
free_extent_buffer(eb);
ret = -EIO;
goto out;
}
src_path->nodes[cur_level] = eb;
btrfs_tree_read_lock(eb);
btrfs_set_lock_blocking_read(eb);
src_path->locks[cur_level] = BTRFS_READ_LOCK_BLOCKING;
}
src_path->slots[cur_level] = dst_path->slots[cur_level];
if (cur_level) {
btrfs_node_key_to_cpu(dst_path->nodes[cur_level],
&dst_key, dst_path->slots[cur_level]);
btrfs_node_key_to_cpu(src_path->nodes[cur_level],
&src_key, src_path->slots[cur_level]);
} else {
btrfs_item_key_to_cpu(dst_path->nodes[cur_level],
&dst_key, dst_path->slots[cur_level]);
btrfs_item_key_to_cpu(src_path->nodes[cur_level],
&src_key, src_path->slots[cur_level]);
}
/* Content mismatch, something went wrong */
if (btrfs_comp_cpu_keys(&dst_key, &src_key)) {
ret = -ENOENT;
goto out;
}
cur_level--;
}
/*
* Now both @dst_path and @src_path have been populated, record the tree
* blocks for qgroup accounting.
*/
ret = btrfs_qgroup_trace_extent(trans, src_path->nodes[dst_level]->start,
nodesize, GFP_NOFS);
if (ret < 0)
goto out;
ret = btrfs_qgroup_trace_extent(trans,
dst_path->nodes[dst_level]->start,
nodesize, GFP_NOFS);
if (ret < 0)
goto out;
/* Record leaf file extents */
if (dst_level == 0 && trace_leaf) {
ret = btrfs_qgroup_trace_leaf_items(trans, src_path->nodes[0]);
if (ret < 0)
goto out;
ret = btrfs_qgroup_trace_leaf_items(trans, dst_path->nodes[0]);
}
out:
btrfs_free_path(src_path);
return ret;
}
/*
* Helper function to do recursive generation-aware depth-first search, to
* locate all new tree blocks in a subtree of reloc tree.
*
* E.g. (OO = Old tree blocks, NN = New tree blocks, whose gen == last_snapshot)
* reloc tree
* L2 NN (a)
* / \
* L1 OO NN (b)
* / \ / \
* L0 OO OO OO NN
* (c) (d)
* If we pass:
* @dst_path = [ nodes[1] = NN(b), nodes[0] = NULL ],
* @cur_level = 1
* @root_level = 1
*
* We will iterate through tree blocks NN(b), NN(d) and info qgroup to trace
* above tree blocks along with their counter parts in file tree.
* While during search, old tree blocks OO(c) will be skipped as tree block swap
* won't affect OO(c).
*/
static int qgroup_trace_new_subtree_blocks(struct btrfs_trans_handle* trans,
struct extent_buffer *src_eb,
struct btrfs_path *dst_path,
int cur_level, int root_level,
u64 last_snapshot, bool trace_leaf)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct extent_buffer *eb;
bool need_cleanup = false;
int ret = 0;
int i;
/* Level sanity check */
if (cur_level < 0 || cur_level >= BTRFS_MAX_LEVEL - 1 ||
root_level < 0 || root_level >= BTRFS_MAX_LEVEL - 1 ||
root_level < cur_level) {
btrfs_err_rl(fs_info,
"%s: bad levels, cur_level=%d root_level=%d",
__func__, cur_level, root_level);
return -EUCLEAN;
}
/* Read the tree block if needed */
if (dst_path->nodes[cur_level] == NULL) {
struct btrfs_key first_key;
int parent_slot;
u64 child_gen;
u64 child_bytenr;
/*
* dst_path->nodes[root_level] must be initialized before
* calling this function.
*/
if (cur_level == root_level) {
btrfs_err_rl(fs_info,
"%s: dst_path->nodes[%d] not initialized, root_level=%d cur_level=%d",
__func__, root_level, root_level, cur_level);
return -EUCLEAN;
}
/*
* We need to get child blockptr/gen from parent before we can
* read it.
*/
eb = dst_path->nodes[cur_level + 1];
parent_slot = dst_path->slots[cur_level + 1];
child_bytenr = btrfs_node_blockptr(eb, parent_slot);
child_gen = btrfs_node_ptr_generation(eb, parent_slot);
btrfs_node_key_to_cpu(eb, &first_key, parent_slot);
/* This node is old, no need to trace */
if (child_gen < last_snapshot)
goto out;
eb = read_tree_block(fs_info, child_bytenr, child_gen,
cur_level, &first_key);
if (IS_ERR(eb)) {
ret = PTR_ERR(eb);
goto out;
} else if (!extent_buffer_uptodate(eb)) {
free_extent_buffer(eb);
ret = -EIO;
goto out;
}
dst_path->nodes[cur_level] = eb;
dst_path->slots[cur_level] = 0;
btrfs_tree_read_lock(eb);
btrfs_set_lock_blocking_read(eb);
dst_path->locks[cur_level] = BTRFS_READ_LOCK_BLOCKING;
need_cleanup = true;
}
/* Now record this tree block and its counter part for qgroups */
ret = qgroup_trace_extent_swap(trans, src_eb, dst_path, cur_level,
root_level, trace_leaf);
if (ret < 0)
goto cleanup;
eb = dst_path->nodes[cur_level];
if (cur_level > 0) {
/* Iterate all child tree blocks */
for (i = 0; i < btrfs_header_nritems(eb); i++) {
/* Skip old tree blocks as they won't be swapped */
if (btrfs_node_ptr_generation(eb, i) < last_snapshot)
continue;
dst_path->slots[cur_level] = i;
/* Recursive call (at most 7 times) */
ret = qgroup_trace_new_subtree_blocks(trans, src_eb,
dst_path, cur_level - 1, root_level,
last_snapshot, trace_leaf);
if (ret < 0)
goto cleanup;
}
}
cleanup:
if (need_cleanup) {
/* Clean up */
btrfs_tree_unlock_rw(dst_path->nodes[cur_level],
dst_path->locks[cur_level]);
free_extent_buffer(dst_path->nodes[cur_level]);
dst_path->nodes[cur_level] = NULL;
dst_path->slots[cur_level] = 0;
dst_path->locks[cur_level] = 0;
}
out:
return ret;
}
static int qgroup_trace_subtree_swap(struct btrfs_trans_handle *trans,
struct extent_buffer *src_eb,
struct extent_buffer *dst_eb,
u64 last_snapshot, bool trace_leaf)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_path *dst_path = NULL;
int level;
int ret;
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
return 0;
/* Wrong parameter order */
if (btrfs_header_generation(src_eb) > btrfs_header_generation(dst_eb)) {
btrfs_err_rl(fs_info,
"%s: bad parameter order, src_gen=%llu dst_gen=%llu", __func__,
btrfs_header_generation(src_eb),
btrfs_header_generation(dst_eb));
return -EUCLEAN;
}
if (!extent_buffer_uptodate(src_eb) || !extent_buffer_uptodate(dst_eb)) {
ret = -EIO;
goto out;
}
level = btrfs_header_level(dst_eb);
dst_path = btrfs_alloc_path();
if (!dst_path) {
ret = -ENOMEM;
goto out;
}
/* For dst_path */
atomic_inc(&dst_eb->refs);
dst_path->nodes[level] = dst_eb;
dst_path->slots[level] = 0;
dst_path->locks[level] = 0;
/* Do the generation aware breadth-first search */
ret = qgroup_trace_new_subtree_blocks(trans, src_eb, dst_path, level,
level, last_snapshot, trace_leaf);
if (ret < 0)
goto out;
ret = 0;
out:
btrfs_free_path(dst_path);
if (ret < 0)
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
return ret;
}
int btrfs_qgroup_trace_subtree(struct btrfs_trans_handle *trans,
struct extent_buffer *root_eb,
u64 root_gen, int root_level)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
int ret = 0;
int level;
struct extent_buffer *eb = root_eb;
struct btrfs_path *path = NULL;
BUG_ON(root_level < 0 || root_level >= BTRFS_MAX_LEVEL);
BUG_ON(root_eb == NULL);
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
return 0;
if (!extent_buffer_uptodate(root_eb)) {
ret = btrfs_read_buffer(root_eb, root_gen, root_level, NULL);
if (ret)
goto out;
}
if (root_level == 0) {
ret = btrfs_qgroup_trace_leaf_items(trans, root_eb);
goto out;
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
/*
* Walk down the tree. Missing extent blocks are filled in as
* we go. Metadata is accounted every time we read a new
* extent block.
*
* When we reach a leaf, we account for file extent items in it,
* walk back up the tree (adjusting slot pointers as we go)
* and restart the search process.
*/
atomic_inc(&root_eb->refs); /* For path */
path->nodes[root_level] = root_eb;
path->slots[root_level] = 0;
path->locks[root_level] = 0; /* so release_path doesn't try to unlock */
walk_down:
level = root_level;
while (level >= 0) {
if (path->nodes[level] == NULL) {
struct btrfs_key first_key;
int parent_slot;
u64 child_gen;
u64 child_bytenr;
/*
* We need to get child blockptr/gen from parent before
* we can read it.
*/
eb = path->nodes[level + 1];
parent_slot = path->slots[level + 1];
child_bytenr = btrfs_node_blockptr(eb, parent_slot);
child_gen = btrfs_node_ptr_generation(eb, parent_slot);
btrfs_node_key_to_cpu(eb, &first_key, parent_slot);
eb = read_tree_block(fs_info, child_bytenr, child_gen,
level, &first_key);
if (IS_ERR(eb)) {
ret = PTR_ERR(eb);
goto out;
} else if (!extent_buffer_uptodate(eb)) {
free_extent_buffer(eb);
ret = -EIO;
goto out;
}
path->nodes[level] = eb;
path->slots[level] = 0;
btrfs_tree_read_lock(eb);
btrfs_set_lock_blocking_read(eb);
path->locks[level] = BTRFS_READ_LOCK_BLOCKING;
ret = btrfs_qgroup_trace_extent(trans, child_bytenr,
fs_info->nodesize,
GFP_NOFS);
if (ret)
goto out;
}
if (level == 0) {
ret = btrfs_qgroup_trace_leaf_items(trans,
path->nodes[level]);
if (ret)
goto out;
/* Nonzero return here means we completed our search */
ret = adjust_slots_upwards(path, root_level);
if (ret)
break;
/* Restart search with new slots */
goto walk_down;
}
level--;
}
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
#define UPDATE_NEW 0
#define UPDATE_OLD 1
/*
* Walk all of the roots that points to the bytenr and adjust their refcnts.
*/
static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info,
struct ulist *roots, struct ulist *tmp,
struct ulist *qgroups, u64 seq, int update_old)
{
struct ulist_node *unode;
struct ulist_iterator uiter;
struct ulist_node *tmp_unode;
struct ulist_iterator tmp_uiter;
struct btrfs_qgroup *qg;
int ret = 0;
if (!roots)
return 0;
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(roots, &uiter))) {
qg = find_qgroup_rb(fs_info, unode->val);
if (!qg)
continue;
ulist_reinit(tmp);
ret = ulist_add(qgroups, qg->qgroupid, qgroup_to_aux(qg),
GFP_ATOMIC);
if (ret < 0)
return ret;
ret = ulist_add(tmp, qg->qgroupid, qgroup_to_aux(qg), GFP_ATOMIC);
if (ret < 0)
return ret;
ULIST_ITER_INIT(&tmp_uiter);
while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
struct btrfs_qgroup_list *glist;
qg = unode_aux_to_qgroup(tmp_unode);
if (update_old)
btrfs_qgroup_update_old_refcnt(qg, seq, 1);
else
btrfs_qgroup_update_new_refcnt(qg, seq, 1);
list_for_each_entry(glist, &qg->groups, next_group) {
ret = ulist_add(qgroups, glist->group->qgroupid,
qgroup_to_aux(glist->group),
GFP_ATOMIC);
if (ret < 0)
return ret;
ret = ulist_add(tmp, glist->group->qgroupid,
qgroup_to_aux(glist->group),
GFP_ATOMIC);
if (ret < 0)
return ret;
}
}
}
return 0;
}
/*
* Update qgroup rfer/excl counters.
* Rfer update is easy, codes can explain themselves.
*
* Excl update is tricky, the update is split into 2 parts.
* Part 1: Possible exclusive <-> sharing detect:
* | A | !A |
* -------------------------------------
* B | * | - |
* -------------------------------------
* !B | + | ** |
* -------------------------------------
*
* Conditions:
* A: cur_old_roots < nr_old_roots (not exclusive before)
* !A: cur_old_roots == nr_old_roots (possible exclusive before)
* B: cur_new_roots < nr_new_roots (not exclusive now)
* !B: cur_new_roots == nr_new_roots (possible exclusive now)
*
* Results:
* +: Possible sharing -> exclusive -: Possible exclusive -> sharing
* *: Definitely not changed. **: Possible unchanged.
*
* For !A and !B condition, the exception is cur_old/new_roots == 0 case.
*
* To make the logic clear, we first use condition A and B to split
* combination into 4 results.
*
* Then, for result "+" and "-", check old/new_roots == 0 case, as in them
* only on variant maybe 0.
*
* Lastly, check result **, since there are 2 variants maybe 0, split them
* again(2x2).
* But this time we don't need to consider other things, the codes and logic
* is easy to understand now.
*/
static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
struct ulist *qgroups,
u64 nr_old_roots,
u64 nr_new_roots,
u64 num_bytes, u64 seq)
{
struct ulist_node *unode;
struct ulist_iterator uiter;
struct btrfs_qgroup *qg;
u64 cur_new_count, cur_old_count;
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(qgroups, &uiter))) {
bool dirty = false;
qg = unode_aux_to_qgroup(unode);
cur_old_count = btrfs_qgroup_get_old_refcnt(qg, seq);
cur_new_count = btrfs_qgroup_get_new_refcnt(qg, seq);
trace_qgroup_update_counters(fs_info, qg, cur_old_count,
cur_new_count);
/* Rfer update part */
if (cur_old_count == 0 && cur_new_count > 0) {
qg->rfer += num_bytes;
qg->rfer_cmpr += num_bytes;
dirty = true;
}
if (cur_old_count > 0 && cur_new_count == 0) {
qg->rfer -= num_bytes;
qg->rfer_cmpr -= num_bytes;
dirty = true;
}
/* Excl update part */
/* Exclusive/none -> shared case */
if (cur_old_count == nr_old_roots &&
cur_new_count < nr_new_roots) {
/* Exclusive -> shared */
if (cur_old_count != 0) {
qg->excl -= num_bytes;
qg->excl_cmpr -= num_bytes;
dirty = true;
}
}
/* Shared -> exclusive/none case */
if (cur_old_count < nr_old_roots &&
cur_new_count == nr_new_roots) {
/* Shared->exclusive */
if (cur_new_count != 0) {
qg->excl += num_bytes;
qg->excl_cmpr += num_bytes;
dirty = true;
}
}
/* Exclusive/none -> exclusive/none case */
if (cur_old_count == nr_old_roots &&
cur_new_count == nr_new_roots) {
if (cur_old_count == 0) {
/* None -> exclusive/none */
if (cur_new_count != 0) {
/* None -> exclusive */
qg->excl += num_bytes;
qg->excl_cmpr += num_bytes;
dirty = true;
}
/* None -> none, nothing changed */
} else {
/* Exclusive -> exclusive/none */
if (cur_new_count == 0) {
/* Exclusive -> none */
qg->excl -= num_bytes;
qg->excl_cmpr -= num_bytes;
dirty = true;
}
/* Exclusive -> exclusive, nothing changed */
}
}
if (dirty)
qgroup_dirty(fs_info, qg);
}
return 0;
}
/*
* Check if the @roots potentially is a list of fs tree roots
*
* Return 0 for definitely not a fs/subvol tree roots ulist
* Return 1 for possible fs/subvol tree roots in the list (considering an empty
* one as well)
*/
static int maybe_fs_roots(struct ulist *roots)
{
struct ulist_node *unode;
struct ulist_iterator uiter;
/* Empty one, still possible for fs roots */
if (!roots || roots->nnodes == 0)
return 1;
ULIST_ITER_INIT(&uiter);
unode = ulist_next(roots, &uiter);
if (!unode)
return 1;
/*
* If it contains fs tree roots, then it must belong to fs/subvol
* trees.
* If it contains a non-fs tree, it won't be shared with fs/subvol trees.
*/
return is_fstree(unode->val);
}
int btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans, u64 bytenr,
u64 num_bytes, struct ulist *old_roots,
struct ulist *new_roots)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct ulist *qgroups = NULL;
struct ulist *tmp = NULL;
u64 seq;
u64 nr_new_roots = 0;
u64 nr_old_roots = 0;
int ret = 0;
/*
* If quotas get disabled meanwhile, the resouces need to be freed and
* we can't just exit here.
*/
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
goto out_free;
if (new_roots) {
if (!maybe_fs_roots(new_roots))
goto out_free;
nr_new_roots = new_roots->nnodes;
}
if (old_roots) {
if (!maybe_fs_roots(old_roots))
goto out_free;
nr_old_roots = old_roots->nnodes;
}
/* Quick exit, either not fs tree roots, or won't affect any qgroup */
if (nr_old_roots == 0 && nr_new_roots == 0)
goto out_free;
BUG_ON(!fs_info->quota_root);
trace_btrfs_qgroup_account_extent(fs_info, trans->transid, bytenr,
num_bytes, nr_old_roots, nr_new_roots);
qgroups = ulist_alloc(GFP_NOFS);
if (!qgroups) {
ret = -ENOMEM;
goto out_free;
}
tmp = ulist_alloc(GFP_NOFS);
if (!tmp) {
ret = -ENOMEM;
goto out_free;
}
mutex_lock(&fs_info->qgroup_rescan_lock);
if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
if (fs_info->qgroup_rescan_progress.objectid <= bytenr) {
mutex_unlock(&fs_info->qgroup_rescan_lock);
ret = 0;
goto out_free;
}
}
mutex_unlock(&fs_info->qgroup_rescan_lock);
spin_lock(&fs_info->qgroup_lock);
seq = fs_info->qgroup_seq;
/* Update old refcnts using old_roots */
ret = qgroup_update_refcnt(fs_info, old_roots, tmp, qgroups, seq,
UPDATE_OLD);
if (ret < 0)
goto out;
/* Update new refcnts using new_roots */
ret = qgroup_update_refcnt(fs_info, new_roots, tmp, qgroups, seq,
UPDATE_NEW);
if (ret < 0)
goto out;
qgroup_update_counters(fs_info, qgroups, nr_old_roots, nr_new_roots,
num_bytes, seq);
/*
* Bump qgroup_seq to avoid seq overlap
*/
fs_info->qgroup_seq += max(nr_old_roots, nr_new_roots) + 1;
out:
spin_unlock(&fs_info->qgroup_lock);
out_free:
ulist_free(tmp);
ulist_free(qgroups);
ulist_free(old_roots);
ulist_free(new_roots);
return ret;
}
int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_qgroup_extent_record *record;
struct btrfs_delayed_ref_root *delayed_refs;
struct ulist *new_roots = NULL;
struct rb_node *node;
u64 num_dirty_extents = 0;
u64 qgroup_to_skip;
int ret = 0;
delayed_refs = &trans->transaction->delayed_refs;
qgroup_to_skip = delayed_refs->qgroup_to_skip;
while ((node = rb_first(&delayed_refs->dirty_extent_root))) {
record = rb_entry(node, struct btrfs_qgroup_extent_record,
node);
num_dirty_extents++;
trace_btrfs_qgroup_account_extents(fs_info, record);
if (!ret) {
/*
* Old roots should be searched when inserting qgroup
* extent record
*/
if (WARN_ON(!record->old_roots)) {
/* Search commit root to find old_roots */
ret = btrfs_find_all_roots(NULL, fs_info,
record->bytenr, 0,
&record->old_roots, false);
if (ret < 0)
goto cleanup;
}
/* Free the reserved data space */
btrfs_qgroup_free_refroot(fs_info,
record->data_rsv_refroot,
record->data_rsv,
BTRFS_QGROUP_RSV_DATA);
/*
* Use SEQ_LAST as time_seq to do special search, which
* doesn't lock tree or delayed_refs and search current
* root. It's safe inside commit_transaction().
*/
ret = btrfs_find_all_roots(trans, fs_info,
record->bytenr, SEQ_LAST, &new_roots, false);
if (ret < 0)
goto cleanup;
if (qgroup_to_skip) {
ulist_del(new_roots, qgroup_to_skip, 0);
ulist_del(record->old_roots, qgroup_to_skip,
0);
}
ret = btrfs_qgroup_account_extent(trans, record->bytenr,
record->num_bytes,
record->old_roots,
new_roots);
record->old_roots = NULL;
new_roots = NULL;
}
cleanup:
ulist_free(record->old_roots);
ulist_free(new_roots);
new_roots = NULL;
rb_erase(node, &delayed_refs->dirty_extent_root);
kfree(record);
}
trace_qgroup_num_dirty_extents(fs_info, trans->transid,
num_dirty_extents);
return ret;
}
#endif /* MY_ABC_HERE */
/*
* called from commit_transaction. Writes all changed qgroups to disk.
*/
int btrfs_run_qgroups(struct btrfs_trans_handle *trans)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
int ret = 0;
if (!fs_info->quota_root)
return ret;
spin_lock(&fs_info->qgroup_lock);
while (!list_empty(&fs_info->dirty_qgroups)) {
struct btrfs_qgroup *qgroup;
qgroup = list_first_entry(&fs_info->dirty_qgroups,
struct btrfs_qgroup, dirty);
list_del_init(&qgroup->dirty);
spin_unlock(&fs_info->qgroup_lock);
ret = update_qgroup_info_item(trans, qgroup);
#ifdef MY_ABC_HERE
if ((ret || qgroup->need_rescan) &&
test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags)) {
struct syno_quota_rescan_item_updater updater;
syno_quota_rescan_item_init(&updater);
updater.flags = SYNO_QUOTA_RESCAN_NEED;
btrfs_add_update_syno_quota_rescan_item(trans,
fs_info->quota_root,
btrfs_qgroup_subvolid(qgroup->qgroupid), &updater);
qgroup->need_rescan = false;
}
#else
if (ret)
fs_info->qgroup_flags |=
BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
#endif /* MY_ABC_HERE */
ret = update_qgroup_limit_item(trans, qgroup);
if (ret)
fs_info->qgroup_flags |=
BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
spin_lock(&fs_info->qgroup_lock);
}
#ifdef MY_ABC_HERE
if (test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags) ||
test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags))
#else
if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
#endif /* MY_ABC_HERE */
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON;
else
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
spin_unlock(&fs_info->qgroup_lock);
ret = update_qgroup_status_item(trans);
if (ret)
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
return ret;
}
/*
* Copy the accounting information between qgroups. This is necessary
* when a snapshot or a subvolume is created. Throwing an error will
* cause a transaction abort so we take extra care here to only error
* when a readonly fs is a reasonable outcome.
*/
int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, u64 srcid,
u64 objectid, struct btrfs_qgroup_inherit *inherit)
{
int ret = 0;
int i;
u64 *i_qgroups;
bool committing = false;
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *quota_root;
struct btrfs_qgroup *srcgroup;
struct btrfs_qgroup *dstgroup;
bool need_rescan = false;
u32 level_size = 0;
u64 nums;
/*
* There are only two callers of this function.
*
* One in create_subvol() in the ioctl context, which needs to hold
* the qgroup_ioctl_lock.
*
* The other one in create_pending_snapshot() where no other qgroup
* code can modify the fs as they all need to either start a new trans
* or hold a trans handler, thus we don't need to hold
* qgroup_ioctl_lock.
* This would avoid long and complex lock chain and make lockdep happy.
*/
spin_lock(&fs_info->trans_lock);
if (trans->transaction->state == TRANS_STATE_COMMIT_DOING)
committing = true;
spin_unlock(&fs_info->trans_lock);
if (!committing)
mutex_lock(&fs_info->qgroup_ioctl_lock);
#ifdef MY_ABC_HERE
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags))
#else
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
#endif /* MY_ABC_HERE */
goto out;
quota_root = fs_info->quota_root;
if (!quota_root) {
#ifdef MY_ABC_HERE
ret = -ESRCH;
#else
ret = -EINVAL;
#endif /* MY_ABC_HERE */
goto out;
}
if (inherit) {
i_qgroups = (u64 *)(inherit + 1);
nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
2 * inherit->num_excl_copies;
for (i = 0; i < nums; ++i) {
srcgroup = find_qgroup_rb(fs_info, *i_qgroups);
/*
* Zero out invalid groups so we can ignore
* them later.
*/
if (!srcgroup ||
((srcgroup->qgroupid >> 48) <= (objectid >> 48)))
*i_qgroups = 0ULL;
++i_qgroups;
}
}
/*
* create a tracking group for the subvol itself
*/
ret = add_qgroup_item(trans, quota_root, objectid);
if (ret)
goto out;
/*
* add qgroup to all inherited groups
*/
if (inherit) {
i_qgroups = (u64 *)(inherit + 1);
for (i = 0; i < inherit->num_qgroups; ++i, ++i_qgroups) {
if (*i_qgroups == 0)
continue;
ret = add_qgroup_relation_item(trans, objectid,
*i_qgroups);
if (ret && ret != -EEXIST)
goto out;
ret = add_qgroup_relation_item(trans, *i_qgroups,
objectid);
if (ret && ret != -EEXIST)
goto out;
}
ret = 0;
}
spin_lock(&fs_info->qgroup_lock);
dstgroup = add_qgroup_rb(fs_info, objectid);
if (IS_ERR(dstgroup)) {
ret = PTR_ERR(dstgroup);
goto unlock;
}
if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) {
dstgroup->lim_flags = inherit->lim.flags;
dstgroup->max_rfer = inherit->lim.max_rfer;
dstgroup->max_excl = inherit->lim.max_excl;
dstgroup->rsv_rfer = inherit->lim.rsv_rfer;
dstgroup->rsv_excl = inherit->lim.rsv_excl;
ret = update_qgroup_limit_item(trans, dstgroup);
if (ret) {
#ifdef MY_ABC_HERE
#else
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
#endif /* MY_ABC_HERE */
btrfs_info(fs_info,
"unable to update quota limit for %llu",
dstgroup->qgroupid);
goto unlock;
}
}
if (srcid) {
srcgroup = find_qgroup_rb(fs_info, srcid);
if (!srcgroup)
goto unlock;
/*
* We call inherit after we clone the root in order to make sure
* our counts don't go crazy, so at this point the only
* difference between the two roots should be the root node.
*/
level_size = fs_info->nodesize;
#ifdef MY_ABC_HERE
// In quota 2.0, we don't count metadata quota.
level_size = 0;
#endif /* MY_ABC_HERE */
dstgroup->rfer = srcgroup->rfer;
dstgroup->rfer_cmpr = srcgroup->rfer_cmpr;
dstgroup->excl = level_size;
dstgroup->excl_cmpr = level_size;
srcgroup->excl = level_size;
srcgroup->excl_cmpr = level_size;
/* inherit the limit info */
dstgroup->lim_flags = srcgroup->lim_flags;
dstgroup->max_rfer = srcgroup->max_rfer;
dstgroup->max_excl = srcgroup->max_excl;
dstgroup->rsv_rfer = srcgroup->rsv_rfer;
dstgroup->rsv_excl = srcgroup->rsv_excl;
qgroup_dirty(fs_info, dstgroup);
qgroup_dirty(fs_info, srcgroup);
}
if (!inherit)
goto unlock;
i_qgroups = (u64 *)(inherit + 1);
for (i = 0; i < inherit->num_qgroups; ++i) {
if (*i_qgroups) {
ret = add_relation_rb(fs_info, objectid, *i_qgroups);
if (ret)
goto unlock;
}
++i_qgroups;
/*
* If we're doing a snapshot, and adding the snapshot to a new
* qgroup, the numbers are guaranteed to be incorrect.
*/
if (srcid)
need_rescan = true;
}
for (i = 0; i < inherit->num_ref_copies; ++i, i_qgroups += 2) {
struct btrfs_qgroup *src;
struct btrfs_qgroup *dst;
if (!i_qgroups[0] || !i_qgroups[1])
continue;
src = find_qgroup_rb(fs_info, i_qgroups[0]);
dst = find_qgroup_rb(fs_info, i_qgroups[1]);
if (!src || !dst) {
ret = -EINVAL;
goto unlock;
}
dst->rfer = src->rfer - level_size;
dst->rfer_cmpr = src->rfer_cmpr - level_size;
/* Manually tweaking numbers certainly needs a rescan */
need_rescan = true;
}
for (i = 0; i < inherit->num_excl_copies; ++i, i_qgroups += 2) {
struct btrfs_qgroup *src;
struct btrfs_qgroup *dst;
if (!i_qgroups[0] || !i_qgroups[1])
continue;
src = find_qgroup_rb(fs_info, i_qgroups[0]);
dst = find_qgroup_rb(fs_info, i_qgroups[1]);
if (!src || !dst) {
ret = -EINVAL;
goto unlock;
}
dst->excl = src->excl + level_size;
dst->excl_cmpr = src->excl_cmpr + level_size;
need_rescan = true;
}
unlock:
spin_unlock(&fs_info->qgroup_lock);
if (!ret)
ret = btrfs_sysfs_add_one_qgroup(fs_info, dstgroup);
out:
if (!committing)
mutex_unlock(&fs_info->qgroup_ioctl_lock);
#ifdef MY_ABC_HERE
// We don't use exclusive quota, so don't need rescan here.
#else
if (need_rescan)
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
#endif /* MY_ABC_HERE */
return ret;
}
static bool qgroup_check_limits(const struct btrfs_qgroup *qg, u64 num_bytes)
{
if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
qgroup_rsv_total(qg) + (s64)qg->rfer + num_bytes > qg->max_rfer)
return false;
if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
qgroup_rsv_total(qg) + (s64)qg->excl + num_bytes > qg->max_excl)
return false;
return true;
}
#ifdef MY_ABC_HERE
/*
* Return 1 if we don't reserve qgroup, but it's not an EDQUOT error.
* Caller is allowed to write.
*/
#endif /* MY_ABC_HERE */
static int qgroup_reserve(struct btrfs_root *root, u64 num_bytes, bool enforce,
enum btrfs_qgroup_rsv_type type)
{
struct btrfs_qgroup *qgroup;
struct btrfs_fs_info *fs_info = root->fs_info;
u64 ref_root = root->root_key.objectid;
int ret = 0;
struct ulist_node *unode;
struct ulist_iterator uiter;
if (!is_fstree(ref_root))
return 0;
if (num_bytes == 0)
return 0;
if (test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags) &&
capable(CAP_SYS_RESOURCE))
enforce = false;
spin_lock(&fs_info->qgroup_lock);
#ifdef MY_ABC_HERE
if (!fs_info->quota_root) {
ret = 1;
goto out;
}
#else
if (!fs_info->quota_root)
goto out;
#endif /* MY_ABC_HERE */
qgroup = find_qgroup_rb(fs_info, ref_root);
#ifdef MY_ABC_HERE
if (!qgroup) {
ret = 1;
goto out;
}
#else
if (!qgroup)
goto out;
#endif /* MY_ABC_HERE */
/*
* in a first step, we check all affected qgroups if any limits would
* be exceeded
*/
ulist_reinit(fs_info->qgroup_ulist);
ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
qgroup_to_aux(qgroup), GFP_ATOMIC);
if (ret < 0)
goto out;
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
struct btrfs_qgroup *qg;
struct btrfs_qgroup_list *glist;
qg = unode_aux_to_qgroup(unode);
if (enforce && !qgroup_check_limits(qg, num_bytes)
#ifdef MY_ABC_HERE
&& !root->invalid_quota
#endif /* MY_ABC_HERE */
) {
ret = -EDQUOT;
goto out;
}
list_for_each_entry(glist, &qg->groups, next_group) {
ret = ulist_add(fs_info->qgroup_ulist,
glist->group->qgroupid,
qgroup_to_aux(glist->group), GFP_ATOMIC);
if (ret < 0)
goto out;
}
}
ret = 0;
/*
* no limits exceeded, now record the reservation into all qgroups
*/
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
struct btrfs_qgroup *qg;
qg = unode_aux_to_qgroup(unode);
qgroup_rsv_add(fs_info, qg, num_bytes, type);
}
out:
spin_unlock(&fs_info->qgroup_lock);
return ret;
}
/*
* Free @num_bytes of reserved space with @type for qgroup. (Normally level 0
* qgroup).
*
* Will handle all higher level qgroup too.
*
* NOTE: If @num_bytes is (u64)-1, this means to free all bytes of this qgroup.
* This special case is only used for META_PERTRANS type.
*/
void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
u64 ref_root, u64 num_bytes,
enum btrfs_qgroup_rsv_type type)
{
struct btrfs_qgroup *qgroup;
struct ulist_node *unode;
struct ulist_iterator uiter;
int ret = 0;
if (!is_fstree(ref_root))
return;
if (num_bytes == 0)
return;
if (num_bytes == (u64)-1 && type != BTRFS_QGROUP_RSV_META_PERTRANS) {
WARN(1, "%s: Invalid type to free", __func__);
return;
}
spin_lock(&fs_info->qgroup_lock);
if (!fs_info->quota_root)
goto out;
qgroup = find_qgroup_rb(fs_info, ref_root);
if (!qgroup)
goto out;
if (num_bytes == (u64)-1)
/*
* We're freeing all pertrans rsv, get reserved value from
* level 0 qgroup as real num_bytes to free.
*/
num_bytes = qgroup->rsv.values[type];
ulist_reinit(fs_info->qgroup_ulist);
ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
qgroup_to_aux(qgroup), GFP_ATOMIC);
if (ret < 0)
goto out;
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
struct btrfs_qgroup *qg;
struct btrfs_qgroup_list *glist;
qg = unode_aux_to_qgroup(unode);
qgroup_rsv_release(fs_info, qg, num_bytes, type);
list_for_each_entry(glist, &qg->groups, next_group) {
ret = ulist_add(fs_info->qgroup_ulist,
glist->group->qgroupid,
qgroup_to_aux(glist->group), GFP_ATOMIC);
if (ret < 0)
goto out;
}
}
out:
spin_unlock(&fs_info->qgroup_lock);
}
#ifdef MY_ABC_HERE
int btrfs_qgroup_syno_reserve(struct btrfs_root *root, u64 num_bytes)
{
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &root->fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &root->fs_info->flags))
return 0;
if (btrfs_root_disable_quota(root))
return 0;
num_bytes = round_up(num_bytes, root->fs_info->sectorsize);
return qgroup_reserve(root, num_bytes, true, BTRFS_QGROUP_RSV_DATA);
}
void btrfs_qgroup_syno_free(struct btrfs_root *root, u64 num_bytes)
{
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &root->fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &root->fs_info->flags))
return;
if (btrfs_root_disable_quota(root))
return;
num_bytes = round_up(num_bytes, root->fs_info->sectorsize);
return btrfs_qgroup_free_refroot(root->fs_info,
root->root_key.objectid, num_bytes,
BTRFS_QGROUP_RSV_DATA);
}
/*
* Copied from btrfs_qgroup_free_refroot()
* Use after inode_add_bytes() / inode_sub_bytes(), so we are always in a transaction
* and our accounting will be committed in btrfs_run_qgroups().
*/
int btrfs_qgroup_syno_accounting(struct btrfs_inode *b_inode,
u64 add_bytes, u64 del_bytes, enum syno_quota_account_type type)
{
struct btrfs_qgroup *qgroup;
struct ulist_node *unode;
struct ulist_iterator uiter;
struct btrfs_root *root = b_inode->root;
struct btrfs_fs_info *fs_info = root->fs_info;
u64 ref_root = root->root_key.objectid;
u64 ino = b_inode->location.objectid;
int ret = 0;
#ifdef MY_ABC_HERE
u64 soft_qgroup_subvol_id = 0;
u64 soft_qgroup_limit = 0;
u64 soft_qgroup_used = 0;
bool over_limit;
#endif /* MY_ABC_HERE */
if (!is_fstree(ref_root))
return -EINVAL;
if (add_bytes == del_bytes && type != UPDATE_QUOTA_FREE_RESERVED)
return 0;
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags))
return 0;
if (btrfs_root_disable_quota(root))
return 0;
spin_lock(&fs_info->qgroup_lock);
if (!fs_info->quota_root)
goto out;
qgroup = find_qgroup_rb(fs_info, ref_root);
if (!qgroup)
goto out;
add_bytes = round_up(add_bytes, fs_info->sectorsize);
del_bytes = round_up(del_bytes, fs_info->sectorsize);
ulist_reinit(fs_info->qgroup_ulist);
ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
qgroup_to_aux(qgroup), GFP_ATOMIC);
if (ret < 0) {
qgroup->need_rescan = true;
goto out;
}
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
struct btrfs_qgroup *qg;
struct btrfs_qgroup_list *glist;
qg = unode_aux_to_qgroup(unode);
switch (type) {
case ADD_QUOTA_RESCAN:
qg->rfer += add_bytes;
#ifdef MY_ABC_HERE
if (!soft_qgroup_subvol_id)
prepare_netlink_notification(qg, &soft_qgroup_subvol_id,
&soft_qgroup_limit, &soft_qgroup_used, &over_limit);
#endif /* MY_ABC_HERE */
break;
case UPDATE_QUOTA_FREE_RESERVED:
qgroup_rsv_release(fs_info, qg, add_bytes, BTRFS_QGROUP_RSV_DATA);
/* fall through */
case UPDATE_QUOTA:
if (btrfs_quota_rescan_check(root, ino)) {
qg->rfer += add_bytes;
if (qg->rfer < del_bytes) {
if (!root->invalid_quota)
WARN_ONCE(1, "qgroup %llu ref underflow, have "
"%llu to free %llu", qgroup->qgroupid, qg->rfer, del_bytes);
qg->rfer = 0;
qg->need_rescan = true;
} else
qg->rfer -= del_bytes;
#ifdef MY_ABC_HERE
if (!soft_qgroup_subvol_id)
prepare_netlink_notification(qg, &soft_qgroup_subvol_id,
&soft_qgroup_limit, &soft_qgroup_used, &over_limit);
#endif /* MY_ABC_HERE */
}
break;
}
qgroup_dirty(fs_info, qg);
list_for_each_entry(glist, &qg->groups, next_group) {
ret = ulist_add(fs_info->qgroup_ulist,
glist->group->qgroupid,
qgroup_to_aux(glist->group), GFP_ATOMIC);
if (ret < 0)
goto out;
}
}
ret = 0;
out:
spin_unlock(&fs_info->qgroup_lock);
#ifdef MY_ABC_HERE
if (soft_qgroup_subvol_id && (add_bytes != del_bytes))
send_netlink_notification(fs_info, soft_qgroup_subvol_id,
soft_qgroup_limit, soft_qgroup_used,
(over_limit)? QGROUP_NL_C_OVER_LIMIT : QGROUP_NL_C_UNDER_LIMIT);
#endif /* MY_ABC_HERE */
return ret;
}
// Similar to btrfs_qgroup_syno_accounting().
int btrfs_qgroup_syno_v1_accounting(struct btrfs_fs_info *fs_info,
struct btrfs_quota_account_rec *record)
{
struct btrfs_qgroup *qgroup;
struct ulist_node *unode;
struct ulist_iterator uiter;
u64 ref_root = record->ref_root;
u64 num_bytes = record->num_bytes;
u64 ram_bytes = record->ram_bytes;
u64 reserved = record->reserved;
int sign = record->sign;
int ret = 0;
if (!is_fstree(ref_root))
return -EINVAL;
spin_lock(&fs_info->qgroup_lock);
if (!fs_info->quota_root)
goto out;
qgroup = find_qgroup_rb(fs_info, ref_root);
if (!qgroup)
goto out;
num_bytes = round_up(num_bytes, fs_info->sectorsize);
ulist_reinit(fs_info->qgroup_ulist);
ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
qgroup_to_aux(qgroup), GFP_ATOMIC);
if (ret < 0)
goto out;
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
struct btrfs_qgroup *qg;
struct btrfs_qgroup_list *glist;
qg = unode_aux_to_qgroup(unode);
if (unlikely(sign < 0 && qg->rfer < num_bytes)) {
/*WARN_ONCE(1, "qgroup %llu ref underflow, have "
"%llu to free %llu", qg->qgroupid, qg->rfer, num_bytes);*/
qg->rfer = 0;
} else
qg->rfer += sign * num_bytes;
if (unlikely(sign < 0 && qg->rfer_cmpr < ram_bytes)) {
/*WARN_ONCE(1, "qgroup %llu rfer_cmpr underflow, have "
"%llu to free %llu", qg->qgroupid, qg->rfer_cmpr, ram_bytes);*/
qg->rfer_cmpr = 0;
} else
qg->rfer_cmpr += sign * ram_bytes;
if (unlikely(sign > 0 && qg->rsv.values[BTRFS_QGROUP_RSV_DATA] < reserved)) {
WARN_ONCE(1, "qgroup %llu reserved space underflow, have %llu to free %llu",
qg->qgroupid, qg->rsv.values[BTRFS_QGROUP_RSV_DATA], reserved);
qg->rsv.values[BTRFS_QGROUP_RSV_DATA] = 0;
} else
qg->rsv.values[BTRFS_QGROUP_RSV_DATA] -= reserved;
qgroup_dirty(fs_info, qg);
list_for_each_entry(glist, &qg->groups, next_group) {
ret = ulist_add(fs_info->qgroup_ulist,
glist->group->qgroupid,
qgroup_to_aux(glist->group), GFP_ATOMIC);
if (ret < 0)
goto out;
}
}
ret = 0;
out:
spin_unlock(&fs_info->qgroup_lock);
return ret;
}
/*
* Similar to btrfs_qgroup_syno_accounting(), but used only in rescan, where
* we don't have in-memory inode.
*/
static int btrfs_qgroup_syno_accounting_rescan(struct btrfs_root *root, u64 num_bytes)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_qgroup *qgroup;
struct ulist_node *unode;
struct ulist_iterator uiter;
u64 subvol_id = root->root_key.objectid;
int ret = 0;
if (num_bytes == 0)
return 0;
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags))
return 0;
spin_lock(&fs_info->qgroup_lock);
if (!fs_info->quota_root)
goto out;
num_bytes = round_up(num_bytes, fs_info->sectorsize);
qgroup = find_qgroup_rb(fs_info, subvol_id);
if (!qgroup)
goto out;
ulist_reinit(fs_info->qgroup_ulist);
ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
qgroup_to_aux(qgroup), GFP_ATOMIC);
if (ret < 0)
goto out;
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
struct btrfs_qgroup *qg;
struct btrfs_qgroup_list *glist;
qg = unode_aux_to_qgroup(unode);
qg->rfer += num_bytes;
qgroup_dirty(fs_info, qg);
list_for_each_entry(glist, &qg->groups, next_group) {
ret = ulist_add(fs_info->qgroup_ulist,
glist->group->qgroupid,
qgroup_to_aux(glist->group), GFP_ATOMIC);
if (ret < 0)
goto out;
}
}
ret = 0;
out:
spin_unlock(&fs_info->qgroup_lock);
return ret;
}
#endif /* MY_ABC_HERE */
#ifdef MY_ABC_HERE
// Progress path can be ctx->current_path or ctx->end_path.
static void syno_quota_update_progress_path(int progress_path[BTRFS_MAX_LEVEL][2],
struct btrfs_path *path)
{
int i;
for (i = 1; i < BTRFS_MAX_LEVEL; i++) {
if (path->nodes[i]) {
progress_path[i][0] = btrfs_header_nritems(path->nodes[i]);
progress_path[i][1] = path->slots[i];
} else {
progress_path[i][0] = 0;
progress_path[i][1] = 0;
}
}
}
/*
* Return 0 when more leafs are to be scanned.
* Return 1 when done.
* Never return -1 since we can try next subvol if error occurs.
*/
static int syno_quota_rescan_leaf(struct btrfs_trans_handle *trans,
struct btrfs_path *path)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *quota_root = fs_info->quota_root;
struct syno_quota_rescan_ctx *ctx = fs_info->syno_quota_rescan_ctx;
struct ulist *ulist = fs_info->syno_quota_rescan_subvol_ulist;
struct ulist_node *node;
struct btrfs_root *root;
struct extent_buffer *leaf;
struct btrfs_key key, found_key;
struct inode *inode;
struct btrfs_inode_item *inode_item;
struct syno_quota_rescan_item_updater updater;
u64 subvol_id;
u64 ino;
u64 max_objectid = 0;
u64 num_bytes;
u64 uid;
int nritems;
int ret = 0;
int err = 0;
if (unlikely(!ctx || !ulist)) {
WARN_ON_ONCE(1);
return 1;
}
mutex_lock(&fs_info->qgroup_rescan_lock);
if (list_empty(&ulist->nodes)) {
mutex_unlock(&fs_info->qgroup_rescan_lock);
return 1;
}
node = list_entry(ulist->nodes.next, struct ulist_node, list);
subvol_id = node->val;
ino = node->aux;
ino++;
mutex_unlock(&fs_info->qgroup_rescan_lock);
root = btrfs_get_fs_root(fs_info, subvol_id, true);
if (IS_ERR(root)) {
ret = PTR_ERR(root);
btrfs_err(fs_info, "Failed to call btrfs_get_fs_root() for root %llu, ret = %d", subvol_id, ret);
goto error_clean;
}
if (unlikely(btrfs_root_dead(root))) {
btrfs_put_root(root);
goto error_clean;
}
// We have changed to another root, reset progress info.
if (ctx->subvol_id != subvol_id) {
struct btrfs_syno_quota_rescan_item rescan_item;
ret = btrfs_read_syno_quota_rescan_item(fs_info->quota_root, subvol_id, &rescan_item);
if (ret)
goto error_clean;
ctx->subvol_id = subvol_id;
ctx->subvol_size = rescan_item.tree_size;
ctx->subvol_progress = 0;
memset(ctx->current_path, 0, sizeof(ctx->current_path));
}
key.objectid = ino;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
search_again:
ret = btrfs_search_slot_for_read(root, &key, path, 1, 0);
if (ret < 0) {
root->invalid_quota = false;
btrfs_put_root(root);
btrfs_err(fs_info, "btrfs_search_slot() failed in root %llu, ret = %d", subvol_id, ret);
goto error_clean;
} else if (ret > 0)
goto out;
leaf = path->nodes[0];
nritems = btrfs_header_nritems(path->nodes[0]);
if (nritems) {
btrfs_item_key_to_cpu(leaf, &found_key, nritems - 1);
max_objectid = found_key.objectid;
syno_quota_update_progress_path(ctx->current_path, path);
}
next_slot:
if (path->slots[0] >= nritems)
goto out;
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.type != BTRFS_INODE_ITEM_KEY || found_key.offset != 0) {
if (found_key.objectid == max_objectid)
goto out;
path->slots[0]++;
goto next_slot;
}
ino = found_key.objectid;
if (ino > root->rescan_end_inode)
goto out;
down_write(&root->rescan_lock);
if (!btrfs_test_inode_nowait(fs_info->sb, ino, root)) {
inode_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item);
num_bytes = btrfs_inode_nbytes(leaf, inode_item);
uid = btrfs_inode_uid(leaf, inode_item);
ret = btrfs_qgroup_syno_accounting_rescan(root, num_bytes);
if (ret) {
btrfs_warn(fs_info, "Failed in btrfs_qgroup_syno_accounting_rescan(), "
"subvol_id = %llu, ino = %llu, ret = %d", subvol_id, ino, ret);
err = ret;
}
ret = btrfs_usrquota_syno_accounting_rescan(root, uid, num_bytes);
if (ret) {
btrfs_warn(fs_info, "Failed in btrfs_usrquota_syno_accounting_rescan(), "
"subvol_id = %llu, ino = %llu, uid = %llu, ret = %d",
subvol_id, ino, uid, ret);
err = ret;
}
root->rescan_inode = ino;
up_write(&root->rescan_lock);
path->slots[0]++;
goto next_slot;
}
up_write(&root->rescan_lock);
btrfs_release_path(path);
inode = btrfs_iget(fs_info->sb, ino, root);
if (IS_ERR(inode)) {
ret = PTR_ERR(inode);
if (ret != -ENOENT) {
btrfs_warn(fs_info, "Failed to call btrfs_iget(), "
"subvol_id = %llu, ino = %llu, ret = %d", subvol_id, ino, ret);
err = ret;
}
} else {
down_write(&root->rescan_lock);
num_bytes = inode_get_bytes(inode);
ret = btrfs_qgroup_syno_accounting(BTRFS_I(inode), num_bytes, 0, ADD_QUOTA_RESCAN);
if (ret) {
btrfs_warn(fs_info, "Failed in btrfs_qgroup_syno_accounting(), "
"subvol_id = %llu, ino = %llu, ret = %d", subvol_id, ino, ret);
err = ret;
}
ret = btrfs_usrquota_syno_accounting(BTRFS_I(inode), num_bytes, 0, ADD_QUOTA_RESCAN);
if (ret) {
btrfs_warn(fs_info, "Failed in btrfs_usrquota_syno_accounting(), "
"subvol_id = %llu, ino = %llu, uid = %llu, ret = %d",
subvol_id, ino, uid, ret);
err = ret;
}
root->rescan_inode = ino;
up_write(&root->rescan_lock);
btrfs_add_delayed_iput(inode);
}
if (ino < max_objectid) {
key.objectid = ino + 1;
goto search_again;
}
out:
if (ino < max_objectid)
ino = max_objectid;
btrfs_release_path(path);
// Mark err but continue the rescan, or we'll see very strange (perhaps zero) quota usage.
if (unlikely(err)) {
syno_quota_rescan_item_init(&updater);
updater.flags = SYNO_QUOTA_RESCAN_ERR;
btrfs_add_update_syno_quota_rescan_item(trans, quota_root, subvol_id, &updater);
}
ret = 0;
mutex_lock(&fs_info->qgroup_rescan_lock);
node = ulist_search(ulist, subvol_id);
if (node) {
if (ino > root->rescan_end_inode) { // This subvol is done. Switch to next subvol.
root->rescan_inode = (u64)-1;
root->rescan_end_inode = (u64)-1;
ulist_del(ulist, subvol_id, node->aux);
syno_quota_rescan_item_init(&updater);
updater.rescan_inode = (u64)-1;
updater.end_inode = (u64)-1;
updater.flags = SYNO_QUOTA_RESCAN_DONE;
ret = btrfs_add_update_syno_quota_rescan_item(trans, quota_root, subvol_id, &updater);
if (ret)
btrfs_warn(fs_info, "Failed to update syno quota rescan item, ret = %d", ret);
if (!list_empty(&ulist->nodes)) {
update_syno_quota_rescan_progress(quota_root, ctx,
subvol_id, SYNO_QUOTA_PROGRESS_FINISH_ONE);
ret = 0;
} else {
update_syno_quota_rescan_progress(quota_root, ctx,
subvol_id, SYNO_QUOTA_PROGRESS_FINISH_ALL);
fs_info->qgroup_rescan_progress.objectid = 0;
ret = 1;
}
} else {
WARN_ON_ONCE(ino < node->aux);
node->aux = (ino > node->aux)? ino : node->aux;
syno_quota_rescan_item_init(&updater);
updater.rescan_inode = node->aux;
updater.flags = SYNO_QUOTA_RESCAN_DOING;
ret = btrfs_add_update_syno_quota_rescan_item(trans, quota_root, subvol_id, &updater);
if (ret)
btrfs_warn(fs_info, "Failed to update syno quota rescan item, ret = %d", ret);
ret = 0;
}
}
mutex_unlock(&fs_info->qgroup_rescan_lock);
btrfs_put_root(root);
return ret;
error_clean:
mutex_lock(&fs_info->qgroup_rescan_lock);
if (ret < 0) {
syno_quota_rescan_item_init(&updater);
updater.rescan_inode = (u64)-1;
updater.end_inode = (u64)-1;
updater.flags = SYNO_QUOTA_RESCAN_ERR | SYNO_QUOTA_RESCAN_DONE;
btrfs_add_update_syno_quota_rescan_item(trans, quota_root, subvol_id, &updater);
}
node = ulist_search(ulist, subvol_id);
if (node) {
ulist_del(ulist, subvol_id, node->aux);
if (!list_empty(&ulist->nodes)) {
update_syno_quota_rescan_progress(quota_root, ctx,
subvol_id, SYNO_QUOTA_PROGRESS_REMOVE_SCANNING);
ret = 0; // Scan next subvol.
} else {
update_syno_quota_rescan_progress(quota_root, ctx,
subvol_id, SYNO_QUOTA_PROGRESS_FINISH_ALL);
fs_info->qgroup_rescan_progress.objectid = 0;
ret = 1;
}
} else
ret = 0; // Scan next subvol.
mutex_unlock(&fs_info->qgroup_rescan_lock);
return ret;
}
#else
/*
* Check if the leaf is the last leaf. Which means all node pointers
* are at their last position.
*/
static bool is_last_leaf(struct btrfs_path *path)
{
int i;
for (i = 1; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) {
if (path->slots[i] != btrfs_header_nritems(path->nodes[i]) - 1)
return false;
}
return true;
}
/*
* returns < 0 on error, 0 when more leafs are to be scanned.
* returns 1 when done.
*/
static int qgroup_rescan_leaf(struct btrfs_trans_handle *trans,
struct btrfs_path *path)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_key found;
struct extent_buffer *scratch_leaf = NULL;
struct ulist *roots = NULL;
u64 num_bytes;
bool done;
int slot;
int ret;
mutex_lock(&fs_info->qgroup_rescan_lock);
ret = btrfs_search_slot_for_read(fs_info->extent_root,
&fs_info->qgroup_rescan_progress,
path, 1, 0);
btrfs_debug(fs_info,
"current progress key (%llu %u %llu), search_slot ret %d",
fs_info->qgroup_rescan_progress.objectid,
fs_info->qgroup_rescan_progress.type,
fs_info->qgroup_rescan_progress.offset, ret);
if (ret) {
/*
* The rescan is about to end, we will not be scanning any
* further blocks. We cannot unset the RESCAN flag here, because
* we want to commit the transaction if everything went well.
* To make the live accounting work in this phase, we set our
* scan progress pointer such that every real extent objectid
* will be smaller.
*/
fs_info->qgroup_rescan_progress.objectid = (u64)-1;
btrfs_release_path(path);
mutex_unlock(&fs_info->qgroup_rescan_lock);
return ret;
}
done = is_last_leaf(path);
btrfs_item_key_to_cpu(path->nodes[0], &found,
btrfs_header_nritems(path->nodes[0]) - 1);
fs_info->qgroup_rescan_progress.objectid = found.objectid + 1;
scratch_leaf = btrfs_clone_extent_buffer(path->nodes[0]);
if (!scratch_leaf) {
ret = -ENOMEM;
mutex_unlock(&fs_info->qgroup_rescan_lock);
goto out;
}
slot = path->slots[0];
btrfs_release_path(path);
mutex_unlock(&fs_info->qgroup_rescan_lock);
for (; slot < btrfs_header_nritems(scratch_leaf); ++slot) {
btrfs_item_key_to_cpu(scratch_leaf, &found, slot);
if (found.type != BTRFS_EXTENT_ITEM_KEY &&
found.type != BTRFS_METADATA_ITEM_KEY)
continue;
if (found.type == BTRFS_METADATA_ITEM_KEY)
num_bytes = fs_info->nodesize;
else
num_bytes = found.offset;
ret = btrfs_find_all_roots(NULL, fs_info, found.objectid, 0,
&roots, false);
if (ret < 0)
goto out;
/* For rescan, just pass old_roots as NULL */
ret = btrfs_qgroup_account_extent(trans, found.objectid,
num_bytes, NULL, roots);
if (ret < 0)
goto out;
}
out:
if (scratch_leaf)
free_extent_buffer(scratch_leaf);
if (done && !ret) {
ret = 1;
fs_info->qgroup_rescan_progress.objectid = (u64)-1;
}
return ret;
}
#endif /* MY_ABC_HERE */
static bool rescan_should_stop(struct btrfs_fs_info *fs_info)
{
return btrfs_fs_closing(fs_info) ||
test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state)
#ifdef MY_ABC_HERE
|| fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_PAUSE
#endif /* MY_ABC_HERE */
;
}
static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
{
struct btrfs_fs_info *fs_info = container_of(work, struct btrfs_fs_info,
qgroup_rescan_work);
struct btrfs_path *path;
struct btrfs_trans_handle *trans = NULL;
int err = -ENOMEM;
int ret = 0;
bool stopped = false;
#ifdef MY_ABC_HERE
again:
#endif /* MY_ABC_HERE */
path = btrfs_alloc_path();
if (!path)
goto out;
/*
* Rescan should only search for commit root, and any later difference
* should be recorded by qgroup
*/
#ifdef MY_ABC_HERE
path->reada = READA_FORWARD_ALWAYS;
#else
path->search_commit_root = 1;
path->skip_locking = 1;
#endif /* MY_ABC_HERE */
err = 0;
while (!err && !(stopped = rescan_should_stop(fs_info))) {
trans = btrfs_start_transaction(fs_info->fs_root, 0);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
break;
}
#ifdef MY_ABC_HERE
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags)) {
err = -EINTR;
} else {
err = syno_quota_rescan_leaf(trans, path);;
}
#else
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
err = -EINTR;
} else {
err = qgroup_rescan_leaf(trans, path);
}
#endif /* MY_ABC_HERE */
if (err > 0)
btrfs_commit_transaction(trans);
else
btrfs_end_transaction(trans);
}
out:
btrfs_free_path(path);
mutex_lock(&fs_info->qgroup_rescan_lock);
if (err > 0 &&
fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT) {
#ifdef MY_ABC_HERE
// Now we clear inconsistent flag by ioctl.
#else
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
#endif /* MY_ABC_HERE */
} else if (err < 0) {
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
}
mutex_unlock(&fs_info->qgroup_rescan_lock);
/*
* only update status, since the previous part has already updated the
* qgroup info.
*/
trans = btrfs_start_transaction(fs_info->quota_root, 1);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
trans = NULL;
btrfs_err(fs_info,
"fail to start transaction for status update: %d",
err);
}
mutex_lock(&fs_info->qgroup_rescan_lock);
#ifdef MY_ABC_HERE
// In case another rescan join in after we left syno_quota_rescan_leaf().
if (err >= 0 && !stopped && fs_info->syno_quota_rescan_subvol_ulist &&
!list_empty(&fs_info->syno_quota_rescan_subvol_ulist->nodes)) {
if (trans)
btrfs_end_transaction(trans);
mutex_unlock(&fs_info->qgroup_rescan_lock);
goto again;
}
#endif /* MY_ABC_HERE */
if (!stopped)
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
if (trans) {
ret = update_qgroup_status_item(trans);
if (ret < 0) {
err = ret;
btrfs_err(fs_info, "fail to update qgroup status: %d",
err);
}
}
fs_info->qgroup_rescan_running = false;
complete_all(&fs_info->qgroup_rescan_completion);
mutex_unlock(&fs_info->qgroup_rescan_lock);
if (!trans)
return;
btrfs_end_transaction(trans);
if (stopped) {
btrfs_info(fs_info, "qgroup scan paused");
} else if (err >= 0) {
#ifdef MY_ABC_HERE
// Now we clear inconsistent flag by ioctl.
btrfs_info(fs_info, "qgroup scan completed");
#else
btrfs_info(fs_info, "qgroup scan completed%s",
err > 0 ? " (inconsistency flag cleared)" : "");
#endif /* MY_ABC_HERE */
} else {
btrfs_err(fs_info, "qgroup scan failed with %d", err);
}
}
/*
* Checks that (a) no rescan is running and (b) quota is enabled. Allocates all
* memory required for the rescan context.
*/
static int
qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
int init_flags)
{
int ret = 0;
if (!init_flags) {
/* we're resuming qgroup rescan at mount time */
if (!(fs_info->qgroup_flags &
BTRFS_QGROUP_STATUS_FLAG_RESCAN)) {
btrfs_warn(fs_info,
"qgroup rescan init failed, qgroup rescan is not queued");
ret = -EINVAL;
} else if (!(fs_info->qgroup_flags &
BTRFS_QGROUP_STATUS_FLAG_ON)) {
btrfs_warn(fs_info,
"qgroup rescan init failed, qgroup is not enabled");
ret = -EINVAL;
}
if (ret)
return ret;
}
mutex_lock(&fs_info->qgroup_rescan_lock);
if (init_flags) {
if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
#ifdef MY_ABC_HERE
#else
btrfs_warn(fs_info,
"qgroup rescan is already in progress");
#endif /* MY_ABC_HERE */
ret = -EINPROGRESS;
} else if (!(fs_info->qgroup_flags &
BTRFS_QGROUP_STATUS_FLAG_ON)) {
btrfs_warn(fs_info,
"qgroup rescan init failed, qgroup is not enabled");
#ifdef MY_ABC_HERE
ret = -ESRCH;
#else
ret = -EINVAL;
#endif /* MY_ABC_HERE */
}
#ifdef MY_ABC_HERE
if (!ret && !fs_info->syno_quota_rescan_ctx) {
fs_info->syno_quota_rescan_ctx =
kzalloc(sizeof(struct syno_quota_rescan_ctx), GFP_KERNEL);
if (!fs_info->syno_quota_rescan_ctx)
ret = -ENOMEM;
}
if (!ret && !fs_info->syno_quota_rescan_subvol_ulist) {
fs_info->syno_quota_rescan_subvol_ulist = ulist_alloc(GFP_KERNEL);
if (!fs_info->syno_quota_rescan_subvol_ulist) {
kfree(fs_info->syno_quota_rescan_ctx);
fs_info->syno_quota_rescan_ctx = NULL;
ret = -ENOMEM;
}
}
#endif /* MY_ABC_HERE */
if (ret) {
mutex_unlock(&fs_info->qgroup_rescan_lock);
return ret;
}
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_RESCAN;
}
memset(&fs_info->qgroup_rescan_progress, 0,
sizeof(fs_info->qgroup_rescan_progress));
fs_info->qgroup_rescan_progress.objectid = progress_objectid;
init_completion(&fs_info->qgroup_rescan_completion);
#ifdef MY_ABC_HERE
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_PAUSE;
#endif /* MY_ABC_HERE */
mutex_unlock(&fs_info->qgroup_rescan_lock);
btrfs_init_work(&fs_info->qgroup_rescan_work,
btrfs_qgroup_rescan_worker, NULL, NULL);
return 0;
}
static void
qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info)
{
struct rb_node *n;
struct btrfs_qgroup *qgroup;
spin_lock(&fs_info->qgroup_lock);
/* clear all current qgroup tracking information */
for (n = rb_first(&fs_info->qgroup_tree); n; n = rb_next(n)) {
qgroup = rb_entry(n, struct btrfs_qgroup, node);
qgroup->rfer = 0;
qgroup->rfer_cmpr = 0;
qgroup->excl = 0;
qgroup->excl_cmpr = 0;
qgroup_dirty(fs_info, qgroup);
}
spin_unlock(&fs_info->qgroup_lock);
}
int
btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info)
{
int ret = 0;
struct btrfs_trans_handle *trans;
ret = qgroup_rescan_init(fs_info, 0, 1);
if (ret)
return ret;
/*
* We have set the rescan_progress to 0, which means no more
* delayed refs will be accounted by btrfs_qgroup_account_ref.
* However, btrfs_qgroup_account_ref may be right after its call
* to btrfs_find_all_roots, in which case it would still do the
* accounting.
* To solve this, we're committing the transaction, which will
* ensure we run all delayed refs and only after that, we are
* going to clear all tracking information for a clean start.
*/
trans = btrfs_join_transaction(fs_info->fs_root);
if (IS_ERR(trans)) {
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
return PTR_ERR(trans);
}
ret = btrfs_commit_transaction(trans);
if (ret) {
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
return ret;
}
qgroup_rescan_zero_tracking(fs_info);
mutex_lock(&fs_info->qgroup_rescan_lock);
fs_info->qgroup_rescan_running = true;
btrfs_queue_work(fs_info->qgroup_rescan_workers,
&fs_info->qgroup_rescan_work);
mutex_unlock(&fs_info->qgroup_rescan_lock);
return 0;
}
int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info,
bool interruptible)
{
int running;
int ret = 0;
mutex_lock(&fs_info->qgroup_rescan_lock);
running = fs_info->qgroup_rescan_running;
mutex_unlock(&fs_info->qgroup_rescan_lock);
if (!running)
return 0;
if (interruptible)
ret = wait_for_completion_interruptible(
&fs_info->qgroup_rescan_completion);
else
wait_for_completion(&fs_info->qgroup_rescan_completion);
return ret;
}
/*
* this is only called from open_ctree where we're still single threaded, thus
* locking is omitted here.
*/
void
btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info)
{
if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
mutex_lock(&fs_info->qgroup_rescan_lock);
fs_info->qgroup_rescan_running = true;
#ifdef MY_ABC_HERE
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_PAUSE;
#endif /* MY_ABC_HERE */
btrfs_queue_work(fs_info->qgroup_rescan_workers,
&fs_info->qgroup_rescan_work);
mutex_unlock(&fs_info->qgroup_rescan_lock);
}
}
#ifdef MY_ABC_HERE
int btrfs_reset_qgroup_status(struct btrfs_trans_handle *trans)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *quota_root = fs_info->quota_root;
struct btrfs_path *path = NULL;
struct btrfs_qgroup_status_item *ptr;
struct extent_buffer *leaf;
struct btrfs_key key;
int ret;
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (!fs_info->quota_root) {
ret = -ENOENT;
goto out;
}
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
key.objectid = 0;
key.type = BTRFS_QGROUP_STATUS_KEY;
key.offset = 0;
ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1);
if (ret)
goto out;
leaf = path->nodes[0];
ptr = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_qgroup_status_item);
fs_info->qgroup_flags &= ~(BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT);
btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags);
btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid);
btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_V2_STATUS_VERSION);
btrfs_mark_buffer_dirty(leaf);
out:
btrfs_free_path(path);
mutex_unlock(&fs_info->qgroup_ioctl_lock);
return ret;
}
int btrfs_syno_qgroup_transfer_limit(struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_root *old_root = NULL;
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_path *path = NULL;
struct extent_buffer *leaf;
struct btrfs_qgroup_limit_item *ptr;
struct btrfs_qgroup *qgroup;
int ret = 0;
int slot;
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (!fs_info->quota_root) {
ret = -ESRCH;
goto out;
}
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags)) {
ret = -ESRCH;
goto out;
}
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
key.objectid = BTRFS_QUOTA_TREE_OBJECTID;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = 0;
old_root = btrfs_read_tree_root(fs_info->tree_root, &key);
if (IS_ERR(old_root)) {
ret = PTR_ERR(old_root);
old_root = NULL;
goto out;
}
key.objectid = 0;
key.type = BTRFS_QGROUP_LIMIT_KEY;
key.offset = 0;
ret = btrfs_search_slot_for_read(old_root, &key, path, 1, 0);
if (ret)
goto out;
while (1) {
slot = path->slots[0];
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, slot);
if (found_key.type > BTRFS_QGROUP_LIMIT_KEY)
break;
if (found_key.type == BTRFS_QGROUP_LIMIT_KEY) {
ptr = btrfs_item_ptr(leaf, slot,
struct btrfs_qgroup_limit_item);
spin_lock(&fs_info->qgroup_lock);
qgroup = find_qgroup_rb(fs_info, found_key.offset);
if (qgroup && qgroup->lim_flags == 0
&& qgroup->max_rfer == 0 && qgroup->max_excl == 0
&& qgroup->rsv_rfer == 0 && qgroup->rsv_excl == 0) {
qgroup->lim_flags = btrfs_qgroup_limit_flags(leaf, ptr);
qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(leaf, ptr);
qgroup->max_excl = btrfs_qgroup_limit_max_excl(leaf, ptr);
qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(leaf, ptr);
qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(leaf, ptr);
qgroup_dirty(fs_info, qgroup);
}
spin_unlock(&fs_info->qgroup_lock);
}
ret = btrfs_next_item(old_root, path);
if (ret)
break;
}
out:
btrfs_free_path(path);
if (old_root) {
free_extent_buffer(old_root->node);
free_extent_buffer(old_root->commit_root);
kfree(old_root);
}
mutex_unlock(&fs_info->qgroup_ioctl_lock);
if (ret > 0)
ret = 0;
return ret;
}
// We may have no qgroup record in volume migration case.
static void qgroup_zero_tracking(struct btrfs_fs_info *fs_info, u64 subvol_id)
{
struct btrfs_qgroup *qgroup;
spin_lock(&fs_info->qgroup_lock);
qgroup = find_qgroup_rb(fs_info, subvol_id);
if (qgroup) {
qgroup->rfer = 0;
qgroup->rfer_cmpr = 0;
qgroup->excl = 0;
qgroup->excl_cmpr = 0;
qgroup_dirty(fs_info, qgroup);
}
spin_unlock(&fs_info->qgroup_lock);
}
int btrfs_syno_quota_rescan(struct btrfs_root *root)
{
int ret = 0;
struct btrfs_fs_info *fs_info = root->fs_info;
struct syno_quota_rescan_ctx *ctx;
struct ulist *ulist;
struct ulist_node *node;
struct btrfs_trans_handle *trans;
struct syno_quota_rescan_item_updater updater;
u64 subvol_id = root->root_key.objectid;
u64 prev_subvol_id = 0;
trans = btrfs_start_transaction(root, 2);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
return ret;
}
ret = qgroup_rescan_init(fs_info, 0, 1);
if (ret && ret != -EINPROGRESS) {
btrfs_end_transaction(trans);
return ret;
}
// Take qgroup_ioctl_lock after we start the transaction. See comments in btrfs_quota_enable().
mutex_lock(&fs_info->qgroup_ioctl_lock);
mutex_lock(&fs_info->qgroup_rescan_lock);
ctx = fs_info->syno_quota_rescan_ctx;
ulist = fs_info->syno_quota_rescan_subvol_ulist;
if (!list_empty(&ulist->nodes)) {
node = list_entry(ulist->nodes.prev, struct ulist_node, list);
prev_subvol_id = node->val;
}
ret = ulist_add(ulist, subvol_id, 0, GFP_KERNEL);
if (ret != 1) {
if (ret == 0)
ret = -EEXIST;
else
ret = -ENOMEM;
goto out;
}
if (prev_subvol_id) {
syno_quota_rescan_item_init(&updater);
updater.next_root = subvol_id;
ret = btrfs_add_update_syno_quota_rescan_item(trans, fs_info->quota_root,
prev_subvol_id, &updater);
if (ret)
goto out;
}
/*
* Step 1. Update rescan item. This may fail so it must be the first step.
* Step 2. Set root->rescan_inode, so existing inodes won't do quota accounting until
* they are scanned.
* Step 3. Zero quota.
* Step 4. Set root->rescan_end_inode, so new inode will do normal quota accounting.
*/
mutex_lock(&root->objectid_mutex);
syno_quota_rescan_item_init(&updater);
updater.flags = SYNO_QUOTA_RESCAN_QUEUED;
updater.version = BTRFS_QGROUP_V2_STATUS_VERSION;
updater.rescan_inode = 0;
updater.end_inode = root->highest_objectid;
updater.tree_size = btrfs_root_used(&root->root_item);
updater.next_root = 0;
ret = btrfs_add_update_syno_quota_rescan_item(trans, fs_info->quota_root, subvol_id, &updater);
if (ret) {
mutex_unlock(&root->objectid_mutex);
goto out; // prev_subvol_id will point to a invalid rescan item, but it's OK, no need to abort.
}
if (!fs_info->qgroup_rescan_progress.objectid)
fs_info->qgroup_rescan_progress.objectid = subvol_id;
root->rescan_inode = 0;
smp_wmb();
qgroup_zero_tracking(fs_info, subvol_id);
btrfs_usrquota_zero_tracking(fs_info, subvol_id);
root->invalid_quota = false;
root->rescan_end_inode = root->highest_objectid;
mutex_unlock(&root->objectid_mutex);
// Remove compression ratio flag from quota v1.
if (btrfs_root_cmpr_ratio(root)) {
btrfs_set_root_flags(&root->root_item,
btrfs_root_flags(&root->root_item) & ~BTRFS_ROOT_SUBVOL_CMPR_RATIO);
ret = btrfs_update_root(trans, fs_info->tree_root,
&root->root_key, &root->root_item);
if (ret) {
// Print wraning but we can fix it manually, no need to abort.
btrfs_warn(fs_info,
"Failed to remove compression ratio flag for root %llu",
root->root_key.objectid);
ret = 0;
}
}
// Remove fast chown flag from quota v1.
fs_info->usrquota_compat_flags &= ~BTRFS_USRQUOTA_COMPAT_FLAG_INODE_QUOTA;
btrfs_end_transaction(trans);
trans = NULL;
// Update progress info.
update_syno_quota_rescan_progress(fs_info->quota_root, ctx,
subvol_id, SYNO_QUOTA_PROGRESS_ADD_NEW);
if (!fs_info->qgroup_rescan_running) {
fs_info->qgroup_rescan_running = true;
btrfs_queue_work(fs_info->qgroup_rescan_workers,
&fs_info->qgroup_rescan_work);
}
ret = 0;
out:
if (trans)
btrfs_end_transaction(trans);
if (ret && ret != -EEXIST) {
ulist_del(ulist, subvol_id, 0);
if (list_empty(&ulist->nodes))
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
}
mutex_unlock(&fs_info->qgroup_rescan_lock);
mutex_unlock(&fs_info->qgroup_ioctl_lock);
/*
* We want everything is on-disk.
* But we can't commit the transaction with qgroup_rescan_lock, or we deadlock with rescan_worker.
*/
if (!ret) {
trans = btrfs_join_transaction(root);
if (!IS_ERR(trans))
btrfs_commit_transaction(trans);
}
return ret;
}
static int syno_quota_rescan_progress(struct btrfs_root *root,
struct btrfs_ioctl_syno_quota_status_args *sa,
bool query_vol_progress, bool query_subvol_progress)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_key key;
struct syno_quota_rescan_ctx *ctx;
struct ulist *ulist;
struct ulist_node *node;
struct btrfs_path *path = NULL;
struct btrfs_root *scanning_root = NULL;
u64 subvol_id = root->root_key.objectid;
int ret;
mutex_lock(&fs_info->qgroup_rescan_lock);
// Update flags for rescan status.
ctx = fs_info->syno_quota_rescan_ctx;
ulist = fs_info->syno_quota_rescan_subvol_ulist;
if (!ctx || !ulist || list_empty(&ulist->nodes) ||
!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)) {
sa->progress = 0;
sa->next_subvol_id = 0;
sa->scanning_subvol_id = 0;
ret = 0;
goto out;
} else if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_PAUSE)
sa->status |= BTRFS_QUOTA_STATUS_VOL_RESCAN_PAUSED;
else if (fs_info->qgroup_rescan_running)
sa->status |= BTRFS_QUOTA_STATUS_VOL_RESCAN_DOING;
else if (rescan_should_stop(fs_info)) {
ret = -ECANCELED;
goto out;
} else {
btrfs_warn_rl(fs_info, "Unexpected state in syno_quota_rescan_progress() but no harm");
ret = -EINVAL;
goto out;
}
// Update current scanning subvol.
sa->scanning_subvol_id = ctx->subvol_id;
// Update next subvol id.
node = ulist_search(ulist, subvol_id);
if (node) {
if (subvol_id == ctx->subvol_id)
sa->status |= BTRFS_QUOTA_STATUS_SUBVOL_RESCANNING;
else
sa->status |= BTRFS_QUOTA_STATUS_SUBVOL_RESCAN_QUEUED;
if (node->list.next != &ulist->nodes) {
node = list_entry(node->list.next, struct ulist_node, list);
sa->next_subvol_id = node->val;
}
} else
sa->next_subvol_id = 0;
/*
* Query volume progress, or query subvol progress that is scanning.
* In both case we need to update ctx->subvol_id progress.
*/
if (query_vol_progress || (query_subvol_progress && ctx->subvol_id == subvol_id)) {
u64 subvol_progress;
u64 vol_progress;
u64 denominator = 0;
u64 numerator = 0;
u64 tmp;
int i;
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
scanning_root = btrfs_get_fs_root(fs_info, ctx->subvol_id, true);
if (IS_ERR(scanning_root)) {
ret = PTR_ERR(scanning_root);
scanning_root = NULL;
goto out;
}
key.objectid = scanning_root->rescan_end_inode;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, scanning_root, &key, path, 0, 0);
if (ret < 0)
goto out;
syno_quota_update_progress_path(ctx->end_path, path);
btrfs_release_path(path);
// Calaulate subvol denominator.
tmp = SYNO_QUOTA_RESCAN_100_PROGRESS;
for (i = BTRFS_MAX_LEVEL - 1; i > 0; i--) {
if (ctx->end_path[i][0]) {
tmp /= ctx->end_path[i][0];
denominator += (tmp * ctx->end_path[i][1]);
}
}
// Calaulate subvol numerator.
tmp = SYNO_QUOTA_RESCAN_100_PROGRESS;
for (i = BTRFS_MAX_LEVEL - 1; i > 0; i--) {
if (ctx->current_path[i][0]) {
tmp /= ctx->current_path[i][0];
numerator += (tmp * ctx->current_path[i][1]);
}
}
if (denominator == 0)
denominator = 1;
if (numerator > denominator)
numerator = denominator;
subvol_progress = (numerator * SYNO_QUOTA_RESCAN_100_PROGRESS) / denominator;
if (subvol_progress < ctx->subvol_progress)
subvol_progress = ctx->subvol_progress;
ctx->subvol_progress = subvol_progress;
if (query_subvol_progress) { // Report subvol progress.
sa->progress = subvol_progress;
sa->status |= BTRFS_QUOTA_STATUS_SUBVOL_PROGRESS_VALID;
} else { // Report vol progress.
denominator = ctx->total_size;
numerator = ctx->total_finished_size +
(ctx->subvol_size * subvol_progress / SYNO_QUOTA_RESCAN_100_PROGRESS);
if (numerator > denominator) {
numerator = denominator;
WARN_ON_ONCE(1);
}
vol_progress = (numerator * SYNO_QUOTA_RESCAN_100_PROGRESS) / denominator;
if (vol_progress < ctx->vol_progress)
vol_progress = ctx->vol_progress;
ctx->vol_progress = vol_progress;
sa->progress = vol_progress;
sa->status |= BTRFS_QUOTA_STATUS_VOL_PROGRESS_VALID;
}
} else if (query_subvol_progress) { // Query subvol progress that is not currently scanning.
struct btrfs_syno_quota_rescan_item rescan_item;
ret = btrfs_read_syno_quota_rescan_item(fs_info->quota_root, subvol_id, &rescan_item);
if (ret)
goto out;
if (rescan_item.flags & SYNO_QUOTA_RESCAN_DONE) {
sa->progress = SYNO_QUOTA_RESCAN_100_PROGRESS;
sa->status |= BTRFS_QUOTA_STATUS_SUBVOL_PROGRESS_VALID;
} else if (rescan_item.flags & SYNO_QUOTA_RESCAN_QUEUED) {
sa->progress = 0;
sa->status |= BTRFS_QUOTA_STATUS_SUBVOL_PROGRESS_VALID;
} else {
WARN_ON_ONCE(1);
ret = -EINVAL;
goto out;
}
}
ret = 0;
out:
btrfs_put_root(scanning_root);
btrfs_free_path(path);
mutex_unlock(&fs_info->qgroup_rescan_lock);
return ret;
}
int btrfs_syno_quota_status(struct btrfs_root *root,
struct btrfs_ioctl_syno_quota_status_args *sa)
{
struct btrfs_fs_info *fs_info = root->fs_info;
int ret = 0;
bool query_vol_progress = false;
bool query_subvol_progress = false;
if (sa->cmd & BTRFS_QUOTA_STATUS_RESCAN_VOL_PROGRESS)
query_vol_progress = true;
if (sa->cmd & BTRFS_QUOTA_STATUS_RESCAN_SUBVOL_PROGRESS)
query_subvol_progress = true;
// We'll return sa to user, so zero it first.
memset(sa, 0, sizeof(*sa));
if (query_vol_progress && query_subvol_progress)
return -EINVAL;
mutex_lock(&fs_info->qgroup_ioctl_lock);
if (!fs_info->quota_root) {
sa->status |= BTRFS_QUOTA_STATUS_VOL_DISABLED;
sa->status |= BTRFS_QUOTA_STATUS_SUBVOL_DISABLED;
goto out;
}
if (test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags))
sa->status |= BTRFS_QUOTA_STATUS_VOL_SYNO_V1_ENABLED;
else if (test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags))
sa->status |= BTRFS_QUOTA_STATUS_VOL_SYNO_V2_ENABLED;
else {
sa->status |= BTRFS_QUOTA_STATUS_VOL_DISABLED;
sa->status |= BTRFS_QUOTA_STATUS_SUBVOL_DISABLED;
goto out;
}
if (root->invalid_quota || btrfs_root_disable_quota(root))
sa->status |= BTRFS_QUOTA_STATUS_SUBVOL_DISABLED;
else
sa->status |= BTRFS_QUOTA_STATUS_SUBVOL_ENABLED;
if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT)
sa->status |= BTRFS_QUOTA_STATUS_INCONSISTENT;
if (fs_info->usrquota_flags & BTRFS_USRQUOTA_STATUS_FLAG_INCONSISTENT)
sa->status |= BTRFS_USRQUOTA_STATUS_INCONSISTENT;
ret = syno_quota_rescan_progress(root, sa,
query_vol_progress, query_subvol_progress);
out:
mutex_unlock(&fs_info->qgroup_ioctl_lock);
return ret;
}
void btrfs_read_syno_quota_for_root(struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_syno_quota_rescan_item rescan_item;
int ret;
#ifdef MY_ABC_HERE
btrfs_check_usrquota_limit(root);
btrfs_check_quota_limit(root);
#endif /* MY_ABC_HERE */
// Only v2 has subvol quota version.
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags)) {
root->invalid_quota = false;
return;
}
ret = btrfs_read_syno_quota_rescan_item(fs_info->quota_root,
root->root_key.objectid, &rescan_item);
if (ret) {
btrfs_info(fs_info, "Failed to read syno quota for root %llu, ret = %d",
root->root_key.objectid, ret);
return;
}
root->rescan_inode = rescan_item.rescan_inode;
root->rescan_end_inode = rescan_item.end_inode;
if (rescan_item.version == BTRFS_QGROUP_V2_STATUS_VERSION)
root->invalid_quota = false;
return;
}
#endif /* MY_ABC_HERE */
#define rbtree_iterate_from_safe(node, next, start) \
for (node = start; node && ({ next = rb_next(node); 1;}); node = next)
static int qgroup_unreserve_range(struct btrfs_inode *inode,
struct extent_changeset *reserved, u64 start,
u64 len)
{
struct rb_node *node;
struct rb_node *next;
struct ulist_node *entry;
int ret = 0;
node = reserved->range_changed.root.rb_node;
if (!node)
return 0;
while (node) {
entry = rb_entry(node, struct ulist_node, rb_node);
if (entry->val < start)
node = node->rb_right;
else
node = node->rb_left;
}
if (entry->val > start && rb_prev(&entry->rb_node))
entry = rb_entry(rb_prev(&entry->rb_node), struct ulist_node,
rb_node);
rbtree_iterate_from_safe(node, next, &entry->rb_node) {
u64 entry_start;
u64 entry_end;
u64 entry_len;
int clear_ret;
entry = rb_entry(node, struct ulist_node, rb_node);
entry_start = entry->val;
entry_end = entry->aux;
entry_len = entry_end - entry_start + 1;
if (entry_start >= start + len)
break;
if (entry_start + entry_len <= start)
continue;
/*
* Now the entry is in [start, start + len), revert the
* EXTENT_QGROUP_RESERVED bit.
*/
clear_ret = clear_extent_bits(&inode->io_tree, entry_start,
entry_end, EXTENT_QGROUP_RESERVED);
if (!ret && clear_ret < 0)
ret = clear_ret;
ulist_del(&reserved->range_changed, entry->val, entry->aux);
if (likely(reserved->bytes_changed >= entry_len)) {
reserved->bytes_changed -= entry_len;
} else {
WARN_ON(1);
reserved->bytes_changed = 0;
}
}
return ret;
}
/*
* Try to free some space for qgroup.
*
* For qgroup, there are only 3 ways to free qgroup space:
* - Flush nodatacow write
* Any nodatacow write will free its reserved data space at run_delalloc_range().
* In theory, we should only flush nodatacow inodes, but it's not yet
* possible, so we need to flush the whole root.
*
* - Wait for ordered extents
* When ordered extents are finished, their reserved metadata is finally
* converted to per_trans status, which can be freed by later commit
* transaction.
*
* - Commit transaction
* This would free the meta_per_trans space.
* In theory this shouldn't provide much space, but any more qgroup space
* is needed.
*/
static int try_flush_qgroup(struct btrfs_root *root)
{
struct btrfs_trans_handle *trans;
int ret;
bool can_commit = true;
/*
* If current process holds a transaction, we shouldn't flush, as we
* assume all space reservation happens before a transaction handle is
* held.
*
* But there are cases like btrfs_delayed_item_reserve_metadata() where
* we try to reserve space with one transction handle already held.
* In that case we can't commit transaction, but at least try to end it
* and hope the started data writes can free some space.
*/
if (current->journal_info &&
current->journal_info != BTRFS_SEND_TRANS_STUB)
can_commit = false;
/*
* We don't want to run flush again and again, so if there is a running
* one, we won't try to start a new flush, but exit directly.
*/
if (test_and_set_bit(BTRFS_ROOT_QGROUP_FLUSHING, &root->state)) {
/*
* We are already holding a transaction, thus we can block other
* threads from flushing. So exit right now. This increases
* the chance of EDQUOT for heavy load and near limit cases.
* But we can argue that if we're already near limit, EDQUOT is
* unavoidable anyway.
*/
if (!can_commit)
return 0;
wait_event(root->qgroup_flush_wait,
!test_bit(BTRFS_ROOT_QGROUP_FLUSHING, &root->state));
return 0;
}
ret = btrfs_start_delalloc_snapshot(root);
if (ret < 0)
goto out;
btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
trans = btrfs_join_transaction(root);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out;
}
if (can_commit)
ret = btrfs_commit_transaction(trans);
else
ret = btrfs_end_transaction(trans);
out:
clear_bit(BTRFS_ROOT_QGROUP_FLUSHING, &root->state);
wake_up(&root->qgroup_flush_wait);
return ret;
}
static int qgroup_reserve_data(struct btrfs_inode *inode,
struct extent_changeset **reserved_ret, u64 start,
u64 len)
{
struct btrfs_root *root = inode->root;
struct extent_changeset *reserved;
bool new_reserved = false;
u64 orig_reserved;
u64 to_reserve;
int ret;
#ifdef MY_ABC_HERE
if ((!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &root->fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &root->fs_info->flags)) ||
#else
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &root->fs_info->flags) ||
#endif /* MY_ABC_HERE */
!is_fstree(root->root_key.objectid) || len == 0)
return 0;
#ifdef MY_ABC_HERE
if (btrfs_root_disable_quota(root))
return 0;
#endif /* MY_ABC_HERE */
#ifdef MY_ABC_HERE
if (!btrfs_root_has_usrquota_limit(root) && !btrfs_root_has_quota_limit(root))
return 0;
#endif /* MY_ABC_HERE */
/* @reserved parameter is mandatory for qgroup */
if (WARN_ON(!reserved_ret))
return -EINVAL;
if (!*reserved_ret) {
new_reserved = true;
*reserved_ret = extent_changeset_alloc();
if (!*reserved_ret)
return -ENOMEM;
}
reserved = *reserved_ret;
/* Record already reserved space */
orig_reserved = reserved->bytes_changed;
ret = set_record_extent_bits(&inode->io_tree, start,
start + len -1, EXTENT_QGROUP_RESERVED, reserved);
/* Newly reserved space */
to_reserve = reserved->bytes_changed - orig_reserved;
trace_btrfs_qgroup_reserve_data(&inode->vfs_inode, start, len,
to_reserve, QGROUP_RESERVE);
if (ret < 0)
goto out;
#ifdef MY_ABC_HERE
ret = usrquota_reserve(inode, to_reserve, true);
if (ret != 0) {
if (ret > 0)
ret = 0;
goto usr_reserve_fail;
}
#endif /* MY_ABC_HERE */
ret = qgroup_reserve(root, to_reserve, true, BTRFS_QGROUP_RSV_DATA);
#ifdef MY_ABC_HERE
if (ret != 0) {
if (ret > 0)
ret = 0;
goto cleanup;
}
#else
if (ret < 0)
goto cleanup;
#endif /* MY_ABC_HERE */
return ret;
cleanup:
#ifdef MY_ABC_HERE
btrfs_usrquota_syno_free(inode, to_reserve);
usr_reserve_fail:
#endif /* MY_ABC_HERE */
qgroup_unreserve_range(inode, reserved, start, len);
out:
if (new_reserved) {
extent_changeset_release(reserved);
kfree(reserved);
*reserved_ret = NULL;
}
return ret;
}
/*
* Reserve qgroup space for range [start, start + len).
*
* This function will either reserve space from related qgroups or do nothing
* if the range is already reserved.
*
* Return 0 for successful reservation
* Return <0 for error (including -EQUOT)
*
* NOTE: This function may sleep for memory allocation, dirty page flushing and
* commit transaction. So caller should not hold any dirty page locked.
*/
int btrfs_qgroup_reserve_data(struct btrfs_inode *inode,
struct extent_changeset **reserved_ret, u64 start,
u64 len)
{
int ret;
ret = qgroup_reserve_data(inode, reserved_ret, start, len);
if (ret <= 0 && ret != -EDQUOT)
return ret;
ret = try_flush_qgroup(inode->root);
if (ret < 0)
return ret;
return qgroup_reserve_data(inode, reserved_ret, start, len);
}
/* Free ranges specified by @reserved, normally in error path */
static int qgroup_free_reserved_data(struct btrfs_inode *inode,
struct extent_changeset *reserved, u64 start, u64 len)
{
struct btrfs_root *root = inode->root;
struct ulist_node *unode;
#ifdef MY_ABC_HERE
struct rb_node *node;
#else
struct ulist_iterator uiter;
#endif /* MY_ABC_HERE */
struct extent_changeset changeset;
int freed = 0;
int ret;
extent_changeset_init(&changeset);
len = round_up(start + len, root->fs_info->sectorsize);
start = round_down(start, root->fs_info->sectorsize);
#ifdef MY_ABC_HERE
unode = ulist_search_with_prev(&reserved->range_changed, start);
while (unode) {
u64 range_start = unode->val;
/* unode->aux is the inclusive end */
u64 range_len = unode->aux - range_start + 1;
u64 free_start;
u64 free_len;
extent_changeset_release(&changeset);
/* Only free range in range [start, start + len) */
if (range_start + range_len <= start)
goto next;
if (range_start >= start + len)
break;
free_start = max(range_start, start);
free_len = min(start + len, range_start + range_len) -
free_start;
/*
* TODO: To also modify reserved->ranges_reserved to reflect
* the modification.
*
* However as long as we free qgroup reserved according to
* EXTENT_QGROUP_RESERVED, we won't double free.
* So not need to rush.
*/
ret = clear_record_extent_bits(&inode->io_tree, free_start,
free_start + free_len - 1,
EXTENT_QGROUP_RESERVED, &changeset);
if (ret < 0)
goto out;
freed += changeset.bytes_changed;
next:
node = rb_next(&unode->rb_node);
if (!node)
break;
unode = rb_entry(node, struct ulist_node, rb_node);
}
#else
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(&reserved->range_changed, &uiter))) {
u64 range_start = unode->val;
/* unode->aux is the inclusive end */
u64 range_len = unode->aux - range_start + 1;
u64 free_start;
u64 free_len;
extent_changeset_release(&changeset);
/* Only free range in range [start, start + len) */
if (range_start >= start + len ||
range_start + range_len <= start)
continue;
free_start = max(range_start, start);
free_len = min(start + len, range_start + range_len) -
free_start;
/*
* TODO: To also modify reserved->ranges_reserved to reflect
* the modification.
*
* However as long as we free qgroup reserved according to
* EXTENT_QGROUP_RESERVED, we won't double free.
* So not need to rush.
*/
ret = clear_record_extent_bits(&inode->io_tree, free_start,
free_start + free_len - 1,
EXTENT_QGROUP_RESERVED, &changeset);
if (ret < 0)
goto out;
freed += changeset.bytes_changed;
}
#endif /* MY_ABC_HERE */
btrfs_qgroup_free_refroot(root->fs_info, root->root_key.objectid, freed,
BTRFS_QGROUP_RSV_DATA);
ret = freed;
out:
extent_changeset_release(&changeset);
return ret;
}
static int __btrfs_qgroup_release_data(struct btrfs_inode *inode,
struct extent_changeset *reserved, u64 start, u64 len,
int free)
{
struct extent_changeset changeset;
int trace_op = QGROUP_RELEASE;
int ret;
#ifdef MY_ABC_HERE
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &inode->root->fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &inode->root->fs_info->flags)) {
if (inode->root->fs_info->need_clear_reserve) {
clear_extent_bit(&inode->io_tree, start, start + len -1,
EXTENT_QGROUP_RESERVED, 0, 0, NULL);
spin_lock(&inode->root->fs_info->usrquota_lock);
inode->uq_reserved = 0;
spin_unlock(&inode->root->fs_info->usrquota_lock);
}
return 0;
}
#else
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &inode->root->fs_info->flags))
return 0;
#endif /* MY_ABC_HERE */
/* In release case, we shouldn't have @reserved */
WARN_ON(!free && reserved);
if (free && reserved)
return qgroup_free_reserved_data(inode, reserved, start, len);
extent_changeset_init(&changeset);
ret = clear_record_extent_bits(&inode->io_tree, start, start + len -1,
EXTENT_QGROUP_RESERVED, &changeset);
if (ret < 0)
goto out;
if (free)
trace_op = QGROUP_FREE;
trace_btrfs_qgroup_release_data(&inode->vfs_inode, start, len,
changeset.bytes_changed, trace_op);
if (free)
btrfs_qgroup_free_refroot(inode->root->fs_info,
inode->root->root_key.objectid,
changeset.bytes_changed, BTRFS_QGROUP_RSV_DATA);
ret = changeset.bytes_changed;
out:
extent_changeset_release(&changeset);
return ret;
}
/*
* Free a reserved space range from io_tree and related qgroups
*
* Should be called when a range of pages get invalidated before reaching disk.
* Or for error cleanup case.
* if @reserved is given, only reserved range in [@start, @start + @len) will
* be freed.
*
* For data written to disk, use btrfs_qgroup_release_data().
*
* NOTE: This function may sleep for memory allocation.
*/
int btrfs_qgroup_free_data(struct btrfs_inode *inode,
struct extent_changeset *reserved, u64 start, u64 len)
{
#ifdef MY_ABC_HERE
int to_free;
to_free = __btrfs_qgroup_release_data(inode, reserved, start, len, 1);
if (to_free > 0)
btrfs_usrquota_syno_free(inode, to_free);
return to_free;
#else
return __btrfs_qgroup_release_data(inode, reserved, start, len, 1);
#endif /* MY_ABC_HERE */
}
/*
* Release a reserved space range from io_tree only.
*
* Should be called when a range of pages get written to disk and corresponding
* FILE_EXTENT is inserted into corresponding root.
*
* Since new qgroup accounting framework will only update qgroup numbers at
* commit_transaction() time, its reserved space shouldn't be freed from
* related qgroups.
*
* But we should release the range from io_tree, to allow further write to be
* COWed.
*
* NOTE: This function may sleep for memory allocation.
*/
int btrfs_qgroup_release_data(struct btrfs_inode *inode, u64 start, u64 len)
{
return __btrfs_qgroup_release_data(inode, NULL, start, len, 0);
}
#ifdef MY_ABC_HERE
#else
static void add_root_meta_rsv(struct btrfs_root *root, int num_bytes,
enum btrfs_qgroup_rsv_type type)
{
if (type != BTRFS_QGROUP_RSV_META_PREALLOC &&
type != BTRFS_QGROUP_RSV_META_PERTRANS)
return;
if (num_bytes == 0)
return;
spin_lock(&root->qgroup_meta_rsv_lock);
if (type == BTRFS_QGROUP_RSV_META_PREALLOC)
root->qgroup_meta_rsv_prealloc += num_bytes;
else
root->qgroup_meta_rsv_pertrans += num_bytes;
spin_unlock(&root->qgroup_meta_rsv_lock);
}
static int sub_root_meta_rsv(struct btrfs_root *root, int num_bytes,
enum btrfs_qgroup_rsv_type type)
{
if (type != BTRFS_QGROUP_RSV_META_PREALLOC &&
type != BTRFS_QGROUP_RSV_META_PERTRANS)
return 0;
if (num_bytes == 0)
return 0;
spin_lock(&root->qgroup_meta_rsv_lock);
if (type == BTRFS_QGROUP_RSV_META_PREALLOC) {
num_bytes = min_t(u64, root->qgroup_meta_rsv_prealloc,
num_bytes);
root->qgroup_meta_rsv_prealloc -= num_bytes;
} else {
num_bytes = min_t(u64, root->qgroup_meta_rsv_pertrans,
num_bytes);
root->qgroup_meta_rsv_pertrans -= num_bytes;
}
spin_unlock(&root->qgroup_meta_rsv_lock);
return num_bytes;
}
#endif /* MY_ABC_HERE */
int btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
enum btrfs_qgroup_rsv_type type, bool enforce)
{
#ifdef MY_ABC_HERE
return 0;
#else
struct btrfs_fs_info *fs_info = root->fs_info;
int ret;
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
!is_fstree(root->root_key.objectid) || num_bytes == 0)
return 0;
BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
trace_qgroup_meta_reserve(root, (s64)num_bytes, type);
ret = qgroup_reserve(root, num_bytes, enforce, type);
if (ret < 0)
return ret;
/*
* Record what we have reserved into root.
*
* To avoid quota disabled->enabled underflow.
* In that case, we may try to free space we haven't reserved
* (since quota was disabled), so record what we reserved into root.
* And ensure later release won't underflow this number.
*/
add_root_meta_rsv(root, num_bytes, type);
return ret;
#endif /* MY_ABC_HERE */
}
int __btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
enum btrfs_qgroup_rsv_type type, bool enforce)
{
#ifdef MY_ABC_HERE
return 0;
#else
int ret;
ret = btrfs_qgroup_reserve_meta(root, num_bytes, type, enforce);
if (ret <= 0 && ret != -EDQUOT)
return ret;
ret = try_flush_qgroup(root);
if (ret < 0)
return ret;
return btrfs_qgroup_reserve_meta(root, num_bytes, type, enforce);
#endif /* MY_ABC_HERE */
}
void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root)
{
#ifdef MY_ABC_HERE
#else
struct btrfs_fs_info *fs_info = root->fs_info;
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
!is_fstree(root->root_key.objectid))
return;
/* TODO: Update trace point to handle such free */
trace_qgroup_meta_free_all_pertrans(root);
/* Special value -1 means to free all reserved space */
btrfs_qgroup_free_refroot(fs_info, root->root_key.objectid, (u64)-1,
BTRFS_QGROUP_RSV_META_PERTRANS);
#endif /* MY_ABC_HERE */
}
void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes,
enum btrfs_qgroup_rsv_type type)
{
#ifdef MY_ABC_HERE
#else
struct btrfs_fs_info *fs_info = root->fs_info;
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
!is_fstree(root->root_key.objectid))
return;
/*
* reservation for META_PREALLOC can happen before quota is enabled,
* which can lead to underflow.
* Here ensure we will only free what we really have reserved.
*/
num_bytes = sub_root_meta_rsv(root, num_bytes, type);
BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
trace_qgroup_meta_reserve(root, -(s64)num_bytes, type);
btrfs_qgroup_free_refroot(fs_info, root->root_key.objectid,
num_bytes, type);
#endif /* MY_ABC_HERE */
}
#ifdef MY_ABC_HERE
#else
static void qgroup_convert_meta(struct btrfs_fs_info *fs_info, u64 ref_root,
int num_bytes)
{
struct btrfs_qgroup *qgroup;
struct ulist_node *unode;
struct ulist_iterator uiter;
int ret = 0;
if (num_bytes == 0)
return;
if (!fs_info->quota_root)
return;
spin_lock(&fs_info->qgroup_lock);
qgroup = find_qgroup_rb(fs_info, ref_root);
if (!qgroup)
goto out;
ulist_reinit(fs_info->qgroup_ulist);
ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
qgroup_to_aux(qgroup), GFP_ATOMIC);
if (ret < 0)
goto out;
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
struct btrfs_qgroup *qg;
struct btrfs_qgroup_list *glist;
qg = unode_aux_to_qgroup(unode);
qgroup_rsv_release(fs_info, qg, num_bytes,
BTRFS_QGROUP_RSV_META_PREALLOC);
qgroup_rsv_add(fs_info, qg, num_bytes,
BTRFS_QGROUP_RSV_META_PERTRANS);
list_for_each_entry(glist, &qg->groups, next_group) {
ret = ulist_add(fs_info->qgroup_ulist,
glist->group->qgroupid,
qgroup_to_aux(glist->group), GFP_ATOMIC);
if (ret < 0)
goto out;
}
}
out:
spin_unlock(&fs_info->qgroup_lock);
}
#endif /* MY_ABC_HERE */
void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes)
{
#ifdef MY_ABC_HERE
#else
struct btrfs_fs_info *fs_info = root->fs_info;
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
!is_fstree(root->root_key.objectid))
return;
/* Same as btrfs_qgroup_free_meta_prealloc() */
num_bytes = sub_root_meta_rsv(root, num_bytes,
BTRFS_QGROUP_RSV_META_PREALLOC);
trace_qgroup_meta_convert(root, num_bytes);
qgroup_convert_meta(fs_info, root->root_key.objectid, num_bytes);
#endif /* MY_ABC_HERE */
}
/*
* Check qgroup reserved space leaking, normally at destroy inode
* time
*/
void btrfs_qgroup_check_reserved_leak(struct btrfs_inode *inode)
{
struct extent_changeset changeset;
struct ulist_node *unode;
struct ulist_iterator iter;
int ret;
extent_changeset_init(&changeset);
ret = clear_record_extent_bits(&inode->io_tree, 0, (u64)-1,
EXTENT_QGROUP_RESERVED, &changeset);
WARN_ON(ret < 0);
if (WARN_ON(changeset.bytes_changed)) {
ULIST_ITER_INIT(&iter);
while ((unode = ulist_next(&changeset.range_changed, &iter))) {
btrfs_warn(inode->root->fs_info,
"leaking qgroup reserved space, ino: %llu, start: %llu, end: %llu",
btrfs_ino(inode), unode->val, unode->aux);
}
btrfs_qgroup_free_refroot(inode->root->fs_info,
inode->root->root_key.objectid,
changeset.bytes_changed, BTRFS_QGROUP_RSV_DATA);
}
extent_changeset_release(&changeset);
}
void btrfs_qgroup_init_swapped_blocks(
struct btrfs_qgroup_swapped_blocks *swapped_blocks)
{
#ifdef MY_ABC_HERE
#else
int i;
spin_lock_init(&swapped_blocks->lock);
for (i = 0; i < BTRFS_MAX_LEVEL; i++)
swapped_blocks->blocks[i] = RB_ROOT;
swapped_blocks->swapped = false;
#endif /* MY_ABC_HERE */
}
/*
* Delete all swapped blocks record of @root.
* Every record here means we skipped a full subtree scan for qgroup.
*
* Gets called when committing one transaction.
*/
void btrfs_qgroup_clean_swapped_blocks(struct btrfs_root *root)
{
#ifdef MY_ABC_HERE
#else
struct btrfs_qgroup_swapped_blocks *swapped_blocks;
int i;
swapped_blocks = &root->swapped_blocks;
spin_lock(&swapped_blocks->lock);
if (!swapped_blocks->swapped)
goto out;
for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
struct rb_root *cur_root = &swapped_blocks->blocks[i];
struct btrfs_qgroup_swapped_block *entry;
struct btrfs_qgroup_swapped_block *next;
rbtree_postorder_for_each_entry_safe(entry, next, cur_root,
node)
kfree(entry);
swapped_blocks->blocks[i] = RB_ROOT;
}
swapped_blocks->swapped = false;
out:
spin_unlock(&swapped_blocks->lock);
#endif /* MY_ABC_HERE */
}
/*
* Add subtree roots record into @subvol_root.
*
* @subvol_root: tree root of the subvolume tree get swapped
* @bg: block group under balance
* @subvol_parent/slot: pointer to the subtree root in subvolume tree
* @reloc_parent/slot: pointer to the subtree root in reloc tree
* BOTH POINTERS ARE BEFORE TREE SWAP
* @last_snapshot: last snapshot generation of the subvolume tree
*/
int btrfs_qgroup_add_swapped_blocks(struct btrfs_trans_handle *trans,
struct btrfs_root *subvol_root,
struct btrfs_block_group *bg,
struct extent_buffer *subvol_parent, int subvol_slot,
struct extent_buffer *reloc_parent, int reloc_slot,
u64 last_snapshot)
{
#ifdef MY_ABC_HERE
return 0;
#else
struct btrfs_fs_info *fs_info = subvol_root->fs_info;
struct btrfs_qgroup_swapped_blocks *blocks = &subvol_root->swapped_blocks;
struct btrfs_qgroup_swapped_block *block;
struct rb_node **cur;
struct rb_node *parent = NULL;
int level = btrfs_header_level(subvol_parent) - 1;
int ret = 0;
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
return 0;
if (btrfs_node_ptr_generation(subvol_parent, subvol_slot) >
btrfs_node_ptr_generation(reloc_parent, reloc_slot)) {
btrfs_err_rl(fs_info,
"%s: bad parameter order, subvol_gen=%llu reloc_gen=%llu",
__func__,
btrfs_node_ptr_generation(subvol_parent, subvol_slot),
btrfs_node_ptr_generation(reloc_parent, reloc_slot));
return -EUCLEAN;
}
block = kmalloc(sizeof(*block), GFP_NOFS);
if (!block) {
ret = -ENOMEM;
goto out;
}
/*
* @reloc_parent/slot is still before swap, while @block is going to
* record the bytenr after swap, so we do the swap here.
*/
block->subvol_bytenr = btrfs_node_blockptr(reloc_parent, reloc_slot);
block->subvol_generation = btrfs_node_ptr_generation(reloc_parent,
reloc_slot);
block->reloc_bytenr = btrfs_node_blockptr(subvol_parent, subvol_slot);
block->reloc_generation = btrfs_node_ptr_generation(subvol_parent,
subvol_slot);
block->last_snapshot = last_snapshot;
block->level = level;
/*
* If we have bg == NULL, we're called from btrfs_recover_relocation(),
* no one else can modify tree blocks thus we qgroup will not change
* no matter the value of trace_leaf.
*/
if (bg && bg->flags & BTRFS_BLOCK_GROUP_DATA)
block->trace_leaf = true;
else
block->trace_leaf = false;
btrfs_node_key_to_cpu(reloc_parent, &block->first_key, reloc_slot);
/* Insert @block into @blocks */
spin_lock(&blocks->lock);
cur = &blocks->blocks[level].rb_node;
while (*cur) {
struct btrfs_qgroup_swapped_block *entry;
parent = *cur;
entry = rb_entry(parent, struct btrfs_qgroup_swapped_block,
node);
if (entry->subvol_bytenr < block->subvol_bytenr) {
cur = &(*cur)->rb_left;
} else if (entry->subvol_bytenr > block->subvol_bytenr) {
cur = &(*cur)->rb_right;
} else {
if (entry->subvol_generation !=
block->subvol_generation ||
entry->reloc_bytenr != block->reloc_bytenr ||
entry->reloc_generation !=
block->reloc_generation) {
/*
* Duplicated but mismatch entry found.
* Shouldn't happen.
*
* Marking qgroup inconsistent should be enough
* for end users.
*/
WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
ret = -EEXIST;
}
kfree(block);
goto out_unlock;
}
}
rb_link_node(&block->node, parent, cur);
rb_insert_color(&block->node, &blocks->blocks[level]);
blocks->swapped = true;
out_unlock:
spin_unlock(&blocks->lock);
out:
if (ret < 0)
fs_info->qgroup_flags |=
BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
return ret;
#endif /* MY_ABC_HERE */
}
/*
* Check if the tree block is a subtree root, and if so do the needed
* delayed subtree trace for qgroup.
*
* This is called during btrfs_cow_block().
*/
int btrfs_qgroup_trace_subtree_after_cow(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *subvol_eb)
{
#ifdef MY_ABC_HERE
return 0;
#else
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_qgroup_swapped_blocks *blocks = &root->swapped_blocks;
struct btrfs_qgroup_swapped_block *block;
struct extent_buffer *reloc_eb = NULL;
struct rb_node *node;
bool found = false;
bool swapped = false;
int level = btrfs_header_level(subvol_eb);
int ret = 0;
int i;
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
return 0;
if (!is_fstree(root->root_key.objectid) || !root->reloc_root)
return 0;
spin_lock(&blocks->lock);
if (!blocks->swapped) {
spin_unlock(&blocks->lock);
return 0;
}
node = blocks->blocks[level].rb_node;
while (node) {
block = rb_entry(node, struct btrfs_qgroup_swapped_block, node);
if (block->subvol_bytenr < subvol_eb->start) {
node = node->rb_left;
} else if (block->subvol_bytenr > subvol_eb->start) {
node = node->rb_right;
} else {
found = true;
break;
}
}
if (!found) {
spin_unlock(&blocks->lock);
goto out;
}
/* Found one, remove it from @blocks first and update blocks->swapped */
rb_erase(&block->node, &blocks->blocks[level]);
for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
if (RB_EMPTY_ROOT(&blocks->blocks[i])) {
swapped = true;
break;
}
}
blocks->swapped = swapped;
spin_unlock(&blocks->lock);
/* Read out reloc subtree root */
reloc_eb = read_tree_block(fs_info, block->reloc_bytenr,
block->reloc_generation, block->level,
&block->first_key);
if (IS_ERR(reloc_eb)) {
ret = PTR_ERR(reloc_eb);
reloc_eb = NULL;
goto free_out;
}
if (!extent_buffer_uptodate(reloc_eb)) {
ret = -EIO;
goto free_out;
}
ret = qgroup_trace_subtree_swap(trans, reloc_eb, subvol_eb,
block->last_snapshot, block->trace_leaf);
free_out:
kfree(block);
free_extent_buffer(reloc_eb);
out:
if (ret < 0) {
btrfs_err_rl(fs_info,
"failed to account subtree at bytenr %llu: %d",
subvol_eb->start, ret);
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
}
return ret;
#endif /* MY_ABC_HERE */
}
void btrfs_qgroup_destroy_extent_records(struct btrfs_transaction *trans)
{
#ifdef MY_ABC_HERE
#else
struct btrfs_qgroup_extent_record *entry;
struct btrfs_qgroup_extent_record *next;
struct rb_root *root;
root = &trans->delayed_refs.dirty_extent_root;
rbtree_postorder_for_each_entry_safe(entry, next, root, node) {
ulist_free(entry->old_roots);
kfree(entry);
}
#endif /* MY_ABC_HERE */
}
#ifdef MY_ABC_HERE
static bool check_quota_from_disk(struct btrfs_fs_info *fs_info, u64 qgroupid)
{
int ret;
int slot;
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_root *quota_root = fs_info->quota_root;
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_qgroup_limit_item *limit_item;
bool has_limit = false;
u64 flags;
u64 max_rfer;
u64 max_excl;
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
key.objectid = 0;
key.type = BTRFS_QGROUP_LIMIT_KEY;
key.offset = qgroupid;
ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0);
if (ret < 0)
goto out;
else if (ret) {
ret = 0;
goto out;
}
slot = path->slots[0];
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, slot);
if (found_key.offset != qgroupid ||
found_key.type != BTRFS_QGROUP_LIMIT_KEY) {
ret = 0;
goto out;
}
limit_item = btrfs_item_ptr(leaf, slot,
struct btrfs_qgroup_limit_item);
flags = btrfs_qgroup_limit_flags(leaf, limit_item);
max_rfer = btrfs_qgroup_limit_max_rfer(leaf, limit_item);
max_excl = btrfs_qgroup_limit_max_excl(leaf, limit_item);
if ((flags & BTRFS_QGROUP_LIMIT_MAX_RFER && max_rfer) ||
(flags & BTRFS_QGROUP_LIMIT_MAX_EXCL && max_excl))
has_limit = true;
ret = 0;
out:
btrfs_free_path(path);
// When an error occurr, we always treat it as having quota_limt.
return (ret) ? true : has_limit;
}
void btrfs_check_quota_limit(struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
bool has_limit = false;
u64 qgroupid = root->root_key.objectid;
struct btrfs_qgroup *qgroup;
spin_lock(&fs_info->qgroup_lock);
if (!fs_info->quota_root) {
spin_unlock(&fs_info->qgroup_lock);
return;
}
qgroup = find_qgroup_rb(fs_info, qgroupid);
if (!qgroup) {
// subtree is unloaded, read from disk.
spin_unlock(&fs_info->qgroup_lock);
has_limit = check_quota_from_disk(fs_info, qgroupid);
} else {
if ((qgroup->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER && qgroup->max_rfer) ||
(qgroup->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL && qgroup->max_excl))
has_limit = true;
spin_unlock(&fs_info->qgroup_lock);
}
btrfs_root_set_has_quota_limit(root, has_limit);
}
#endif /* MY_ABC_HERE */
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