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

2878 lines
76 KiB
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#ifndef MY_ABC_HERE
#define MY_ABC_HERE
#endif
/*
* Copyright (C) 2021 Synology Inc. All rights reserved.
*/
#include <linux/rbtree.h>
#include <linux/fs.h>
#include <linux/btrfs.h>
#include "ctree.h"
#include "transaction.h"
#include "disk-io.h"
#include "locking.h"
#include "extent_io.h"
#include "qgroup.h"
#include "backref.h"
#define USRQUOTA_RO_SUBVOL_EXIST_GEN 10
struct btrfs_usrquota {
u64 uq_objectid;
u64 uq_uid; // __kuid_val(inode->i_uid)
// info item
u64 uq_generation;
u64 uq_rfer_used;
// limit item
u64 uq_rfer_soft;
u64 uq_rfer_hard;
// reservation tracking
u64 uq_reserved;
struct list_head uq_dirty;
u64 uq_refcnt; // accurate on dummy node only
// tree of userquota
struct rb_node uq_node;
bool need_rescan;
bool update_limit;
};
struct btrfs_subvol_list {
u64 subvol_id;
struct list_head list;
};
static void usrquota_subtree_unload_nolock(struct btrfs_fs_info *fs_info, u64 rootid);
static u64 find_next_valid_objectid(struct btrfs_fs_info *fs_info, u64 objectid)
{
struct rb_node *node = fs_info->usrquota_tree.rb_node;
struct btrfs_usrquota *usrquota;
u64 valid_objectid = 0;
while (node) {
usrquota = rb_entry(node, struct btrfs_usrquota, uq_node);
if (usrquota->uq_objectid > objectid) {
valid_objectid = usrquota->uq_objectid;
node = node->rb_left;
} else if (usrquota->uq_objectid < objectid)
node = node->rb_right;
else
break;
}
if (node) {
usrquota = rb_entry(node, struct btrfs_usrquota, uq_node);
valid_objectid = usrquota->uq_objectid;
}
return valid_objectid;
}
/*
* *_usrquota_rb should protected by usrquota_lock
*/
static struct rb_node *find_usrquota_first_rb(struct btrfs_fs_info *fs_info,
u64 objectid)
{
struct rb_node *node = fs_info->usrquota_tree.rb_node;
struct rb_node *found = NULL;
struct btrfs_usrquota *usrquota;
again:
while (node) {
usrquota = rb_entry(node, struct btrfs_usrquota, uq_node);
if (usrquota->uq_objectid > objectid)
node = node->rb_left;
else if (usrquota->uq_objectid < objectid)
node = node->rb_right;
else
break;
}
if (!node)
goto out;
found = node;
while (node->rb_left) {
usrquota = rb_entry(node->rb_left, struct btrfs_usrquota, uq_node);
node = node->rb_left;
if (usrquota->uq_objectid != objectid)
goto again;
found = node;
}
out:
return found;
}
static struct btrfs_usrquota *find_usrquota_rb(struct btrfs_fs_info *fs_info,
u64 objectid, u64 uid)
{
struct rb_node *node = fs_info->usrquota_tree.rb_node;
struct btrfs_usrquota *usrquota;
while (node) {
usrquota = rb_entry(node, struct btrfs_usrquota, uq_node);
if (usrquota->uq_objectid > objectid)
node = node->rb_left;
else if (usrquota->uq_objectid < objectid)
node = node->rb_right;
else if (usrquota->uq_uid > uid)
node = node->rb_left;
else if (usrquota->uq_uid < uid)
node = node->rb_right;
else
return usrquota;
}
return NULL;
}
static struct btrfs_usrquota *__add_usrquota_rb(struct btrfs_fs_info *fs_info,
u64 objectid, u64 uid, int subtree_check)
{
struct rb_node **p = &fs_info->usrquota_tree.rb_node;
struct rb_node *parent = NULL;
struct btrfs_usrquota *usrquota;
struct btrfs_root *subvol_root;
int subtree_loaded = 0;
while (*p) {
parent = *p;
usrquota = rb_entry(parent, struct btrfs_usrquota, uq_node);
if (usrquota->uq_objectid > objectid)
p = &(*p)->rb_left;
else if (usrquota->uq_objectid < objectid)
p = &(*p)->rb_right;
else if (usrquota->uq_uid > uid) {
subtree_loaded = 1;
p = &(*p)->rb_left;
} else if (usrquota->uq_uid < uid) {
subtree_loaded = 1;
p = &(*p)->rb_right;
} else
return usrquota;
}
if (subtree_check && !subtree_loaded) {
subvol_root = btrfs_get_fs_root(fs_info, objectid, true);
if (IS_ERR(subvol_root)) {
btrfs_err(fs_info, "Failed to get subvol from rootid[%llu].", objectid);
} else {
btrfs_debug(fs_info, "Usrquota subtree for rootid [%llu], read-only[%d], is not loaded.",
objectid, btrfs_root_readonly(subvol_root));
btrfs_put_root(subvol_root);
}
return ERR_PTR(-ENOENT);
}
usrquota = kzalloc(sizeof(*usrquota), GFP_ATOMIC);
if (!usrquota)
return ERR_PTR(-ENOMEM);
usrquota->uq_objectid = objectid;
usrquota->uq_uid = uid;
INIT_LIST_HEAD(&usrquota->uq_dirty);
rb_link_node(&usrquota->uq_node, parent, p);
rb_insert_color(&usrquota->uq_node, &fs_info->usrquota_tree);
return usrquota;
}
/*
* Caller of add_usrquota_rb[_no_check] should hold usrquota_lock
*/
static inline struct btrfs_usrquota *add_usrquota_rb_nocheck(struct btrfs_fs_info *fs_info,
u64 objectid, u64 uid)
{
return __add_usrquota_rb(fs_info, objectid, uid, 0);
}
static inline struct btrfs_usrquota *add_usrquota_dummy_rb_nocheck(struct btrfs_fs_info *fs_info,
u64 objectid)
{
struct btrfs_usrquota *usrquota;
usrquota = __add_usrquota_rb(fs_info, objectid, 0, 0);
if (!IS_ERR_OR_NULL(usrquota))
usrquota->uq_refcnt = 1;
return usrquota;
}
static inline struct btrfs_usrquota *add_usrquota_rb(struct btrfs_fs_info *fs_info,
u64 objectid, u64 uid)
{
return __add_usrquota_rb(fs_info, objectid, uid, 1);
}
static int del_usrquota_rb(struct btrfs_fs_info *fs_info, struct btrfs_usrquota *usrquota)
{
rb_erase(&usrquota->uq_node, &fs_info->usrquota_tree);
list_del(&usrquota->uq_dirty);
kfree(usrquota);
return 0;
}
static void usrquota_free_reserve(struct btrfs_fs_info *fs_info,
struct btrfs_usrquota *usrquota,
struct btrfs_inode *b_inode, u64 num_bytes)
{
#ifdef USRQUOTA_DEBUG
printk(KERN_INFO "usrquota_free_reserve debug: root = %llu, ino = %lu, uid = %llu, "
"reserved = %llu, to_free = %llu", usrquota->uq_objectid,
(b_inode) ? b_inode->vfs_inode.i_ino : 0,
usrquota->uq_uid, usrquota->uq_reserved, num_bytes);
#endif /* USRQUOTA_DEBUG */
if (usrquota->uq_reserved >= num_bytes)
usrquota->uq_reserved -= num_bytes;
else {
WARN_ONCE(1, "user quota root %llu uid %llu reserved space underflow, "
"have %llu to free %llu",
usrquota->uq_objectid, usrquota->uq_uid,
usrquota->uq_reserved, num_bytes);
usrquota->uq_reserved = 0;
}
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags) &&
!btrfs_usrquota_fast_chown_enable(&b_inode->vfs_inode))
return;
if (b_inode->uq_reserved >= num_bytes)
b_inode->uq_reserved -= num_bytes;
else {
WARN_ONCE(1, "user quota root %llu inode %llu reserved space underflow, "
"have %llu to free %llu",
usrquota->uq_objectid, b_inode->location.objectid,
b_inode->uq_reserved, num_bytes);
b_inode->uq_reserved = 0;
}
}
/*
* Caller of usrquota_subtree_load has responsibility to call usrquota_subtree_unload
* to dec reference count except btrfs_usrquota_load_config
* Caller should make sure user quota won't leave us.
*/
int usrquota_subtree_load(struct btrfs_fs_info *fs_info, u64 rootid)
{
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_root *usrquota_root = fs_info->usrquota_root;
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_usrquota_info_item *info_item;
struct btrfs_usrquota_limit_item *limit_item;
struct btrfs_usrquota *usrquota;
int slot;
int ret = 0;
struct rb_node *node;
spin_lock(&fs_info->usrquota_lock);
if (!fs_info->usrquota_root) {
spin_unlock(&fs_info->usrquota_lock);
return -EINVAL;
}
node = find_usrquota_first_rb(fs_info, rootid);
if (node) {
usrquota = rb_entry(node, struct btrfs_usrquota, uq_node);
usrquota->uq_refcnt++;
spin_unlock(&fs_info->usrquota_lock);
return 0;
}
// insert a dummy node to identify if subtree is loaded or not
usrquota = add_usrquota_dummy_rb_nocheck(fs_info, rootid);
if (IS_ERR(usrquota)) {
spin_unlock(&fs_info->usrquota_lock);
return PTR_ERR(usrquota);
}
spin_unlock(&fs_info->usrquota_lock);
path = btrfs_alloc_path();
if (!path) {
return -ENOMEM;
}
key.objectid = rootid;
key.type = 0;
key.offset = 0;
ret = btrfs_search_slot_for_read(usrquota_root, &key, path, 1, 0);
if (ret < 0)
goto out;
if (ret) {
ret = 0;
goto out;
}
while (1) {
slot = path->slots[0];
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, slot);
if (found_key.objectid > rootid)
break;
if (found_key.type != BTRFS_USRQUOTA_INFO_KEY &&
found_key.type != BTRFS_USRQUOTA_LIMIT_KEY)
goto next_item;
spin_lock(&fs_info->usrquota_lock);
if (!fs_info->usrquota_root) {
spin_unlock(&fs_info->usrquota_lock);
ret = -EINVAL;
goto out;
}
usrquota = add_usrquota_rb_nocheck(fs_info, found_key.objectid, found_key.offset);
if (IS_ERR(usrquota)) {
spin_unlock(&fs_info->usrquota_lock);
ret = PTR_ERR(usrquota);
goto out;
}
switch (found_key.type) {
case BTRFS_USRQUOTA_INFO_KEY:
info_item = btrfs_item_ptr(leaf, slot,
struct btrfs_usrquota_info_item);
usrquota->uq_generation = btrfs_usrquota_info_generation(leaf, info_item);
usrquota->uq_rfer_used = btrfs_usrquota_info_rfer_used(leaf, info_item);
break;
case BTRFS_USRQUOTA_LIMIT_KEY:
limit_item = btrfs_item_ptr(leaf, slot,
struct btrfs_usrquota_limit_item);
usrquota->uq_rfer_soft = btrfs_usrquota_limit_rfer_soft(leaf, limit_item);
usrquota->uq_rfer_hard = btrfs_usrquota_limit_rfer_hard(leaf, limit_item);
break;
}
spin_unlock(&fs_info->usrquota_lock);
next_item:
ret = btrfs_next_item(usrquota_root, path);
if (ret < 0) {
btrfs_err(fs_info, "failed to get next_item of usrquota tree");
goto out;
}
if (ret) {
ret = 0;
break;
}
}
out:
if (ret) {
// refcnt is possible greater than 1,
// such that we use unload function to check refcnt
usrquota_subtree_unload(fs_info, rootid);
}
btrfs_free_path(path);
return ret;
}
static void usrquota_ro_subvol_check(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
{
int ret;
mutex_lock(&fs_info->usrquota_ro_roots_lock);
if (!btrfs_root_readonly(root)) {
goto out;
}
root->usrquota_loaded_gen = fs_info->generation;
if (!list_empty(&root->usrquota_ro_root))
goto out;
ret = usrquota_subtree_load(fs_info, root->root_key.objectid);
if (ret) {
btrfs_err(fs_info, "failed to load ro subvol usrquota subtree [%llu].",
root->root_key.objectid);
goto out;
}
btrfs_debug(fs_info, "Load ro sub [id:%llu, gen:%llu]", root->root_key.objectid,
root->usrquota_loaded_gen);
list_add_tail(&root->usrquota_ro_root, &fs_info->usrquota_ro_roots);
btrfs_grab_root(root);
out:
mutex_unlock(&fs_info->usrquota_ro_roots_lock);
return;
}
static void usrquota_subtree_unload_nolock(struct btrfs_fs_info *fs_info, u64 rootid)
{
struct btrfs_usrquota *usrquota;
struct rb_node *node;
node = find_usrquota_first_rb(fs_info, rootid);
if (node) {
usrquota = rb_entry(node, struct btrfs_usrquota, uq_node);
WARN_ON(usrquota->uq_uid); // This should be the dummy node.
if (usrquota->uq_refcnt > 1) {
usrquota->uq_refcnt--;
return;
}
}
while (node) {
usrquota = rb_entry(node, struct btrfs_usrquota, uq_node);
node = rb_next(node);
if (usrquota->uq_objectid > rootid)
break;
del_usrquota_rb(fs_info, usrquota);
}
}
// Caller should make sure user quota won't leave us.
void usrquota_subtree_unload(struct btrfs_fs_info *fs_info, u64 rootid)
{
spin_lock(&fs_info->usrquota_lock);
if (fs_info->usrquota_root)
usrquota_subtree_unload_nolock(fs_info, rootid);
spin_unlock(&fs_info->usrquota_lock);
}
static int usrquota_subtree_load_one(struct btrfs_fs_info *fs_info, struct btrfs_path *path, struct list_head *subvol_queue, u64 subvol_id)
{
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_root *subvol_root;
struct extent_buffer *leaf;
struct btrfs_subvol_list *subvol_list;
int slot;
int ret = 0;
subvol_root = btrfs_get_fs_root(fs_info, subvol_id, true);
if (IS_ERR(subvol_root)) {
ret = PTR_ERR(subvol_root);
goto out;
}
if (btrfs_root_readonly(subvol_root))
goto update_queue;
ret = usrquota_subtree_load(fs_info, subvol_id);
if (ret) {
goto out;
}
update_queue:
if (btrfs_root_noload_usrquota(subvol_root))
goto out;
key.objectid = subvol_id;
key.type = BTRFS_ROOT_REF_KEY;
key.offset = 0;
ret = btrfs_search_slot_for_read(fs_info->tree_root, &key, path, 1, 0);
if (ret < 0)
goto out;
if (ret > 0) {
ret = 0; //no entry
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_ROOT_REF_KEY)
break;
if (!IS_ERR_OR_NULL(subvol_root))
btrfs_put_root(subvol_root);
subvol_root = btrfs_get_fs_root(fs_info, found_key.offset, true);
if (IS_ERR(subvol_root)) {
ret = PTR_ERR(subvol_root);
goto out;
}
subvol_list = kzalloc(sizeof(*subvol_list), GFP_KERNEL);
if (!subvol_list) {
ret = -ENOMEM;
goto out;
}
INIT_LIST_HEAD(&subvol_list->list);
subvol_list->subvol_id = found_key.offset;
list_add_tail(&subvol_list->list, subvol_queue);
ret = btrfs_next_item(fs_info->tree_root, path);
if (ret < 0)
goto out;
if (ret > 0) {
ret = 0; //no entry
goto out;
}
}
out:
btrfs_release_path(path);
if (!IS_ERR_OR_NULL(subvol_root))
btrfs_put_root(subvol_root);
return ret;
}
static int usrquota_subtree_load_all(struct btrfs_fs_info *fs_info)
{
struct btrfs_path *path = NULL;
struct list_head subvol_queue;
struct btrfs_subvol_list *subvol_list;
int ret = 0;
INIT_LIST_HEAD(&subvol_queue);
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
subvol_list = kzalloc(sizeof(*subvol_list), GFP_KERNEL);
if (!subvol_list) {
ret = -ENOMEM;
goto out;
}
INIT_LIST_HEAD(&subvol_list->list);
subvol_list->subvol_id = BTRFS_FS_TREE_OBJECTID;
list_add_tail(&subvol_list->list, &subvol_queue);
while (!list_empty(&subvol_queue)) {
subvol_list = list_first_entry(&subvol_queue, struct btrfs_subvol_list, list);
list_del_init(&subvol_list->list);
if (!ret) {
ret = usrquota_subtree_load_one(fs_info, path, &subvol_queue, subvol_list->subvol_id);
if (ret) {
btrfs_err(fs_info, "failed to load usrquota subtree %llu, ret=%d", subvol_list->subvol_id, ret);
}
}
kfree(subvol_list);
}
out:
btrfs_free_path(path);
return ret;
}
int btrfs_read_usrquota_compat_config(struct btrfs_fs_info *fs_info)
{
int ret = 0;
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_root *usrquota_root = fs_info->usrquota_root;
struct extent_buffer *leaf;
struct btrfs_usrquota_compat_item *compat_item;
int slot;
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags))
return 0;
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
fs_info->usrquota_compat_flags = 0;
key.objectid = 0;
key.type = BTRFS_USRQUOTA_COMPAT_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, usrquota_root, &key, path, 0, 0);
if (ret) {
if (ret > 0) {
fs_info->usrquota_compat_flags = BTRFS_USRQUOTA_COMPAT_FLAG;
ret = 0;
}
goto out;
}
slot = path->slots[0];
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, slot);
compat_item = btrfs_item_ptr(leaf, slot,
struct btrfs_usrquota_compat_item);
fs_info->usrquota_compat_flags |= btrfs_usrquota_compat_flags(leaf, compat_item);
fs_info->usrquota_compat_flags &= BTRFS_USRQUOTA_COMPAT_FLAG;
if (btrfs_usrquota_compat_generation(leaf, compat_item) != fs_info->generation) {
fs_info->usrquota_compat_flags = 0;
}
out:
btrfs_free_path(path);
return ret;
}
int btrfs_read_usrquota_config(struct btrfs_fs_info *fs_info)
{
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_root *usrquota_root = fs_info->usrquota_root;
struct btrfs_path *path = NULL;
struct extent_buffer *leaf;
struct btrfs_usrquota_status_item *status_item;
int slot;
int ret = 0;
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags))
return 0;
// Enable user quota only if we have enabled qgroup.
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags))
goto out;
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
/* default this to quota off, in case no status key is found */
fs_info->usrquota_flags = 0;
key.objectid = 0;
key.type = BTRFS_USRQUOTA_STATUS_KEY;
key.offset = 0;
ret = btrfs_search_slot_for_read(usrquota_root, &key, path, 1, 0);
if (ret) {
// Disable user quota but don't fail the mount process.
ret = 0;
goto out;
}
slot = path->slots[0];
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, slot);
if (found_key.type != BTRFS_USRQUOTA_STATUS_KEY)
goto out;
status_item = btrfs_item_ptr(leaf, slot,
struct btrfs_usrquota_status_item);
if (test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) &&
btrfs_usrquota_status_version(leaf, status_item) !=
BTRFS_USRQUOTA_STATUS_VERSION) {
btrfs_err(fs_info,
"syno user quota v1 found bad %llu version, quota disabled",
btrfs_usrquota_status_version(leaf, status_item));
goto out;
}
if (test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags) &&
btrfs_usrquota_status_version(leaf, status_item) !=
BTRFS_USRQUOTA_V2_STATUS_VERSION) {
btrfs_err(fs_info,
"syno user quota v2 found bad %llu version, quota disabled",
btrfs_usrquota_status_version(leaf, status_item));
goto out;
}
if (btrfs_usrquota_status_generation(leaf, status_item) != fs_info->generation) {
fs_info->usrquota_flags |= BTRFS_USRQUOTA_STATUS_FLAG_INCONSISTENT;
btrfs_err(fs_info,
"user quota generation mismatch, marked as inconsistent");
}
fs_info->usrquota_flags |= btrfs_usrquota_status_flags(leaf, status_item);
btrfs_release_path(path);
ret = btrfs_read_usrquota_compat_config(fs_info);
if (ret)
goto out;
ret = usrquota_subtree_load_all(fs_info);
out:
if (ret)
fs_info->usrquota_flags &= ~BTRFS_USRQUOTA_STATUS_FLAG_ON;
if (!(fs_info->usrquota_flags & BTRFS_USRQUOTA_STATUS_FLAG_ON)) {
clear_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags);
clear_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags);
btrfs_err(fs_info, "usrquota disabled due to faield to load tree\n");
}
btrfs_free_path(path);
return ret;
}
/*
* Called in close_ctree() when user 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_usrquota_leak(struct btrfs_fs_info *fs_info)
{
struct rb_node *node;
struct btrfs_usrquota *usrquota;
bool ret = false;
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags))
return ret;
/*
* Since we're unmounting, there is no race and no need to grab usrquota
* lock. And here we don't go post-order to provide a more user
* friendly sorted result.
*/
for (node = rb_first(&fs_info->usrquota_tree); node; node = rb_next(node)) {
usrquota = rb_entry(node, struct btrfs_usrquota, uq_node);
if (usrquota->uq_reserved) {
ret = true;
btrfs_warn(fs_info, "user quota %llu:%llu has unreleased space = %llu",
usrquota->uq_objectid, usrquota->uq_uid, usrquota->uq_reserved);
}
}
return ret;
}
void btrfs_free_usrquota_config(struct btrfs_fs_info *fs_info)
{
struct rb_node *node;
struct btrfs_usrquota *usrquota;
while ((node = rb_first(&fs_info->usrquota_tree))) {
usrquota = rb_entry(node, struct btrfs_usrquota, uq_node);
del_usrquota_rb(fs_info, usrquota);
}
}
static int update_usrquota_root_item(struct btrfs_trans_handle *trans,
struct btrfs_path *path,
u64 objectid, int info_item_diff, int limit_item_diff)
{
struct btrfs_key key;
struct extent_buffer *leaf = NULL;
struct btrfs_usrquota_root_item *usrquota_root = NULL;
u64 info_item_cnt;
u64 limit_item_cnt;
int ret;
key.objectid = objectid;
key.type = BTRFS_USRQUOTA_ROOT_KEY;
key.offset = 0;
ret = btrfs_insert_empty_item(trans, trans->fs_info->usrquota_root, path, &key,
sizeof(struct btrfs_usrquota_root_item));
if (ret && ret != -EEXIST)
goto out;
leaf = path->nodes[0];
usrquota_root = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_usrquota_root_item);
if (ret == -EEXIST) {
info_item_cnt = btrfs_usrquota_root_info_item_cnt(leaf, usrquota_root);
limit_item_cnt = btrfs_usrquota_root_limit_item_cnt(leaf, usrquota_root);
info_item_cnt += info_item_diff;
limit_item_cnt += limit_item_diff;
} else {
info_item_cnt = info_item_diff;
limit_item_cnt = limit_item_diff;
}
if (info_item_cnt > (1ULL << 63) || limit_item_cnt > (1ULL << 63)) {
WARN_ON(1);
ret = -ERANGE;
goto out;
}
btrfs_set_usrquota_root_info_item_cnt(leaf, usrquota_root, info_item_cnt);
btrfs_set_usrquota_root_limit_item_cnt(leaf, usrquota_root, limit_item_cnt);
btrfs_mark_buffer_dirty(leaf);
ret = 0;
out:
btrfs_release_path(path);
return ret;
}
static int remove_usrquota_item(struct btrfs_trans_handle *trans,
u64 rootid, u64 uid, int type)
{
int ret = 0;
struct btrfs_root *usrquota_root = trans->fs_info->usrquota_root;
struct btrfs_path *path;
struct btrfs_key key;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = rootid;
key.offset = uid;
key.type = type;
ret = btrfs_search_slot(trans, usrquota_root, &key, path, -1, 1);
if (ret) {
ret = 0;
goto out;
}
ret = btrfs_del_item(trans, usrquota_root, path);
if (ret) {
btrfs_err(trans->fs_info, "failed to delete user quota item, rootid=%llu, uid=%llu\n", rootid, uid);
goto out;
}
btrfs_release_path(path);
if (BTRFS_USRQUOTA_INFO_KEY == type)
ret = update_usrquota_root_item(trans, path, rootid, -1, 0);
else if (BTRFS_USRQUOTA_LIMIT_KEY == type)
ret = update_usrquota_root_item(trans, path, rootid, 0, -1);
if (ret) {
btrfs_err(trans->fs_info, "failed to dec user quota item cnt, rootid=%llu, uid=%llu\n", rootid, uid);
goto out;
}
out:
btrfs_free_path(path);
return ret;
}
static int update_usrquota_limit_item(struct btrfs_trans_handle *trans,
u64 objectid, u64 uid, u64 rfer_soft, u64 rfer_hard)
{
struct btrfs_root *usrquota_root = trans->fs_info->usrquota_root;
struct btrfs_path *path;
struct btrfs_key key;
struct extent_buffer *leaf;
struct btrfs_usrquota_limit_item *usrquota_limit;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = objectid;
key.type = BTRFS_USRQUOTA_LIMIT_KEY;
key.offset = uid;
ret = btrfs_insert_empty_item(trans, usrquota_root, path, &key,
sizeof(struct btrfs_usrquota_limit_item));
if (ret && ret != -EEXIST)
goto out;
leaf = path->nodes[0];
usrquota_limit = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_usrquota_limit_item);
btrfs_set_usrquota_limit_rfer_soft(leaf, usrquota_limit, rfer_soft);
btrfs_set_usrquota_limit_rfer_hard(leaf, usrquota_limit, rfer_hard);
btrfs_mark_buffer_dirty(leaf);
if (ret == 0) {
btrfs_release_path(path);
ret = update_usrquota_root_item(trans, path, objectid, 0, 1);
} else // ret == -EEXIST
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
static int update_usrquota_info_item(struct btrfs_trans_handle *trans,
u64 objectid, u64 uid, u64 rfer_used)
{
struct btrfs_root *usrquota_root = trans->fs_info->usrquota_root;
struct btrfs_path *path;
struct btrfs_key key;
struct extent_buffer *leaf;
struct btrfs_usrquota_info_item *usrquota_info;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = objectid;
key.type = BTRFS_USRQUOTA_INFO_KEY;
key.offset = uid;
ret = btrfs_insert_empty_item(trans, usrquota_root, path, &key,
sizeof(struct btrfs_usrquota_info_item));
if (ret && ret != -EEXIST)
goto out;
leaf = path->nodes[0];
usrquota_info = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_usrquota_info_item);
btrfs_set_usrquota_info_rfer_used(leaf, usrquota_info, rfer_used);
btrfs_set_usrquota_info_generation(leaf, usrquota_info, trans->transid);
btrfs_mark_buffer_dirty(leaf);
if (ret == 0) {
btrfs_release_path(path);
ret = update_usrquota_root_item(trans, path, objectid, 1, 0);
} else // ret == -EEXIST
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
static int update_usrquota_status_item(struct btrfs_trans_handle *trans)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *root = fs_info->usrquota_root;
struct btrfs_path *path;
struct btrfs_key key;
struct extent_buffer *leaf;
struct btrfs_usrquota_status_item *ptr;
int ret;
int slot;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = 0;
key.type = BTRFS_USRQUOTA_STATUS_KEY;
key.offset = 0;
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret) {
if (ret > 0)
ret = -ENOENT;
goto out;
}
leaf = path->nodes[0];
slot = path->slots[0];
ptr = btrfs_item_ptr(leaf, slot, struct btrfs_usrquota_status_item);
btrfs_set_usrquota_status_flags(leaf, ptr, fs_info->usrquota_flags);
btrfs_set_usrquota_status_generation(leaf, ptr, trans->transid);
btrfs_mark_buffer_dirty(leaf);
out:
btrfs_free_path(path);
return ret;
}
static int insert_usrquota_compat_item(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, struct btrfs_root *root)
{
struct btrfs_path *path = NULL;
struct btrfs_usrquota_compat_item *ptr;
struct extent_buffer *leaf;
struct btrfs_key key;
int ret = 0;
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
key.objectid = 0;
key.type = BTRFS_USRQUOTA_COMPAT_KEY;
key.offset = 0;
ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*ptr));
if (ret)
goto out;
leaf = path->nodes[0];
ptr = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_usrquota_compat_item);
btrfs_set_usrquota_compat_generation(leaf, ptr, trans->transid);
btrfs_set_usrquota_compat_flags(leaf, ptr, fs_info->usrquota_compat_flags);
btrfs_mark_buffer_dirty(leaf);
out:
btrfs_free_path(path);
return ret;
}
static int update_usrquota_compat_item(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, struct btrfs_root *root)
{
struct btrfs_path *path;
struct btrfs_key key;
struct extent_buffer *leaf;
struct btrfs_usrquota_compat_item *ptr;
int ret;
int slot;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = 0;
key.type = BTRFS_USRQUOTA_COMPAT_KEY;
key.offset = 0;
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret) {
if (ret > 0) {
btrfs_release_path(path);
ret = insert_usrquota_compat_item(trans, fs_info, root);
}
goto out;
}
leaf = path->nodes[0];
slot = path->slots[0];
ptr = btrfs_item_ptr(leaf, slot, struct btrfs_usrquota_compat_item);
btrfs_set_usrquota_compat_generation(leaf, ptr, trans->transid);
btrfs_set_usrquota_compat_flags(leaf, ptr, fs_info->usrquota_compat_flags);
btrfs_mark_buffer_dirty(leaf);
out:
btrfs_free_path(path);
return ret;
}
static int btrfs_clean_usrquota_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
struct btrfs_path *path;
struct btrfs_key key;
struct extent_buffer *leaf;
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;
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;
}
int btrfs_usrquota_enable(struct btrfs_fs_info *fs_info, u64 cmd)
{
struct btrfs_root *usrquota_root;
struct btrfs_path *path = NULL;
struct btrfs_usrquota_status_item *ptr;
struct extent_buffer *leaf;
struct btrfs_trans_handle *trans = NULL;
struct btrfs_key key;
int ret = 0;
// Default using v2 quota.
if (cmd == BTRFS_USRQUOTA_CTL_ENABLE)
cmd = BTRFS_USRQUOTA_V2_CTL_ENABLE;
if (btrfs_test_opt(fs_info, NO_QUOTA_TREE)) {
btrfs_info(fs_info, "Can't enable usrquota with mount_opt no_quota_tree");
return -EINVAL;
}
/*
* Protected by fs_info->subvol_sem, so qgroup will not do disable
* before we finish user quota enable.
*/
if (!test_bit(BTRFS_FS_SYNO_QUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_QUOTA_V2_ENABLED, &fs_info->flags)) {
btrfs_warn(fs_info,
"Should enable qgroup before enable user quota.");
return -EINVAL;
}
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (fs_info->usrquota_root)
goto out;
mutex_unlock(&fs_info->usrquota_ioctl_lock);
trans = btrfs_start_transaction(fs_info->tree_root, 2);
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
trans = NULL;
goto out;
}
if (fs_info->usrquota_root)
goto out;
if (cmd == BTRFS_USRQUOTA_V1_CTL_ENABLE)
usrquota_root = btrfs_create_tree(trans, BTRFS_USRQUOTA_TREE_OBJECTID);
else
usrquota_root = btrfs_create_tree(trans, BTRFS_SYNO_USRQUOTA_V2_TREE_OBJECTID);
if (IS_ERR(usrquota_root)) {
ret = PTR_ERR(usrquota_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_USRQUOTA_STATUS_KEY;
key.offset = 0;
ret = btrfs_insert_empty_item(trans, usrquota_root, path, &key, sizeof(*ptr));
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out_free_root;
}
leaf = path->nodes[0];
ptr = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_usrquota_status_item);
btrfs_set_usrquota_status_generation(leaf, ptr, trans->transid);
if (cmd == BTRFS_USRQUOTA_V1_CTL_ENABLE)
btrfs_set_usrquota_status_version(leaf, ptr, BTRFS_USRQUOTA_STATUS_VERSION);
else
btrfs_set_usrquota_status_version(leaf, ptr, BTRFS_USRQUOTA_V2_STATUS_VERSION);
fs_info->usrquota_flags = BTRFS_USRQUOTA_STATUS_FLAG_ON |
BTRFS_USRQUOTA_STATUS_FLAG_INCONSISTENT;
btrfs_set_usrquota_status_flags(leaf, ptr, fs_info->usrquota_flags);
btrfs_mark_buffer_dirty(leaf);
btrfs_release_path(path);
if (cmd == BTRFS_USRQUOTA_V1_CTL_ENABLE) {
fs_info->usrquota_compat_flags = BTRFS_USRQUOTA_COMPAT_FLAG;
ret = insert_usrquota_compat_item(trans, fs_info, usrquota_root);
if (ret) {
fs_info->usrquota_compat_flags = 0;
btrfs_abort_transaction(trans, ret);
goto out_free_root;
}
}
fs_info->usrquota_root = usrquota_root;
ret = usrquota_subtree_load_all(fs_info);
if (ret) {
btrfs_err(fs_info, "failed to init usrquota subtree during enable usrquota");
btrfs_abort_transaction(trans, ret);
goto out_free_root;
}
ret = btrfs_commit_transaction(trans);
trans = NULL;
if (ret)
goto out_free_root;
/*
* Set quota enabled flag after committing the transaction, to avoid
* deadlocks on fs_info->usrquota_ioctl_lock with concurrent snapshot
* creation.
*/
down_write(&fs_info->inflight_reserve_lock);
spin_lock(&fs_info->usrquota_lock);
fs_info->usrquota_root = usrquota_root;
if (cmd == BTRFS_USRQUOTA_V1_CTL_ENABLE)
set_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags);
else
set_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags);
spin_unlock(&fs_info->usrquota_lock);
up_write(&fs_info->inflight_reserve_lock);
out_free_root:
if (ret) {
fs_info->usrquota_root = NULL;
btrfs_put_root(usrquota_root);
}
out:
btrfs_free_path(path);
mutex_unlock(&fs_info->usrquota_ioctl_lock);
if (ret && trans)
btrfs_end_transaction(trans);
else if (trans)
ret = btrfs_end_transaction(trans);
return ret;
}
int btrfs_usrquota_disable(struct btrfs_fs_info *fs_info)
{
struct btrfs_root *usrquota_root;
struct btrfs_trans_handle *trans = NULL;
int ret = 0;
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (!fs_info->usrquota_root)
goto out;
mutex_unlock(&fs_info->usrquota_ioctl_lock);
trans = btrfs_start_transaction(fs_info->tree_root, 1);
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
trans = NULL;
goto out;
}
if (!fs_info->usrquota_root)
goto out;
clear_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags);
clear_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags);
btrfs_qgroup_wait_for_completion(fs_info, false);
spin_lock(&fs_info->usrquota_lock);
usrquota_root = fs_info->usrquota_root;
fs_info->usrquota_root = NULL;
fs_info->usrquota_flags &= ~BTRFS_USRQUOTA_STATUS_FLAG_ON;
spin_unlock(&fs_info->usrquota_lock);
btrfs_free_usrquota_config(fs_info);
ret = btrfs_clean_usrquota_tree(trans, usrquota_root);
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out;
}
ret = btrfs_del_root(trans, &usrquota_root->root_key);
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out;
}
list_del(&usrquota_root->dirty_list);
btrfs_tree_lock(usrquota_root->node);
btrfs_clean_tree_block(usrquota_root->node);
btrfs_tree_unlock(usrquota_root->node);
btrfs_free_tree_block(trans, usrquota_root, usrquota_root->node, 0, 1);
btrfs_put_root(usrquota_root);
out:
mutex_unlock(&fs_info->usrquota_ioctl_lock);
if (ret && trans)
btrfs_end_transaction(trans);
else if (trans)
ret = btrfs_end_transaction(trans);
return ret;
}
int btrfs_usrquota_unload(struct btrfs_fs_info *fs_info)
{
struct btrfs_root *usrquota_root;
struct btrfs_trans_handle *trans = NULL;
int ret = 0;
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (!fs_info->usrquota_root)
goto out;
mutex_unlock(&fs_info->usrquota_ioctl_lock);
trans = btrfs_start_transaction(fs_info->tree_root, 1);
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
trans = NULL;
goto out;
}
if (!fs_info->usrquota_root)
goto out;
clear_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags);
clear_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags);
btrfs_qgroup_wait_for_completion(fs_info, false);
spin_lock(&fs_info->usrquota_lock);
usrquota_root = fs_info->usrquota_root;
fs_info->usrquota_root = NULL;
fs_info->usrquota_flags &= ~BTRFS_USRQUOTA_STATUS_FLAG_ON;
spin_unlock(&fs_info->usrquota_lock);
btrfs_free_usrquota_config(fs_info);
btrfs_commit_transaction(trans);
trans = NULL;
list_del(&usrquota_root->dirty_list);
btrfs_put_root(usrquota_root);
out:
mutex_unlock(&fs_info->usrquota_ioctl_lock);
if (ret && trans)
btrfs_end_transaction(trans);
else if (trans)
ret = btrfs_end_transaction(trans);
return ret;
}
int btrfs_usrquota_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 user quota root.
location.objectid = BTRFS_USRQUOTA_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;
}
/*
* This function should protected by usrquota_lock
*/
static void usrquota_dirty(struct btrfs_fs_info *fs_info,
struct btrfs_usrquota *usrquota)
{
if (list_empty(&usrquota->uq_dirty))
list_add(&usrquota->uq_dirty, &fs_info->dirty_usrquota);
}
int btrfs_usrquota_limit(struct btrfs_trans_handle *trans,
u64 objectid, u64 uid, u64 rfer_soft, u64 rfer_hard)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_usrquota *usrquota;
kuid_t tmp_uid;
u64 kernel_uid;
int ret = 0;
#ifdef MY_ABC_HERE
struct btrfs_root *root = trans->root;
bool need_check = false;
#endif /* MY_ABC_HERE */
tmp_uid = make_kuid(current_user_ns(), (uid_t)uid);
if (!uid_valid(tmp_uid))
return -EINVAL;
kernel_uid = __kuid_val(tmp_uid);
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (!fs_info->usrquota_root) {
ret = -ESRCH;
goto out;
}
spin_lock(&fs_info->usrquota_lock);
usrquota = add_usrquota_rb(fs_info, objectid, kernel_uid);
if (IS_ERR(usrquota)) {
spin_unlock(&fs_info->usrquota_lock);
ret = PTR_ERR(usrquota);
goto out;
}
#ifdef MY_ABC_HERE
if ((rfer_soft || rfer_hard) && !btrfs_root_has_usrquota_limit(root))
btrfs_root_set_has_usrquota_limit(root, true);
// When update limit to zero, we should re-check quota limit.
else if (!rfer_soft && !rfer_hard &&
(usrquota->uq_rfer_soft || usrquota->uq_rfer_hard))
need_check = true;
#endif /* MY_ABC_HERE */
usrquota->uq_rfer_soft = rfer_soft;
usrquota->uq_rfer_hard = rfer_hard;
spin_unlock(&fs_info->usrquota_lock);
ret = update_usrquota_limit_item(trans, objectid, kernel_uid, rfer_soft, rfer_hard);
if (ret) {
fs_info->usrquota_flags |= BTRFS_USRQUOTA_STATUS_FLAG_INCONSISTENT;
btrfs_err(fs_info, "failed to update limit item");
goto out;
}
#ifdef MY_ABC_HERE
if (need_check)
btrfs_check_usrquota_limit(root);
#endif /* MY_ABC_HERE */
out:
mutex_unlock(&fs_info->usrquota_ioctl_lock);
return ret;
}
int btrfs_usrquota_clean(struct btrfs_trans_handle *trans, u64 uid)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_usrquota *usrquota;
int ret = 0;
kuid_t tmp_uid;
u64 kernel_uid;
u64 objectid = 0;
tmp_uid = make_kuid(current_user_ns(), (uid_t)uid);
if (!uid_valid(tmp_uid))
return -EINVAL;
kernel_uid = __kuid_val(tmp_uid);
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags)) {
ret = -ESRCH;
goto out;
}
while (1) {
spin_lock(&fs_info->usrquota_lock);
objectid = find_next_valid_objectid(fs_info, objectid);
if (!objectid) {
spin_unlock(&fs_info->usrquota_lock);
break;
}
usrquota = find_usrquota_rb(fs_info, objectid, kernel_uid);
if (usrquota) {
usrquota->uq_rfer_soft = 0;
usrquota->uq_rfer_hard = 0;
spin_unlock(&fs_info->usrquota_lock);
ret = remove_usrquota_item(trans, objectid, kernel_uid, BTRFS_USRQUOTA_LIMIT_KEY);
if (ret) {
btrfs_err(fs_info, "failed to remove limit item");
break;
}
} else {
spin_unlock(&fs_info->usrquota_lock);
}
objectid++;
}
out:
mutex_unlock(&fs_info->usrquota_ioctl_lock);
return ret;
}
/*
* Use after inode_add_bytes() / inode_sub_bytes(), so we are always in a transaction
* and our accounting will be committed in btrfs_run_usrquota().
*/
int btrfs_usrquota_syno_accounting(struct btrfs_inode *b_inode,
u64 add_bytes, u64 del_bytes, enum syno_quota_account_type type)
{
struct btrfs_usrquota *usrquota;
struct btrfs_root *root = b_inode->root;
struct btrfs_fs_info *fs_info = root->fs_info;
struct inode *inode = &b_inode->vfs_inode;
u64 uid;
u64 ref_root = root->root_key.objectid;
u64 ino = b_inode->location.objectid;
int ret = 0;
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_USRQUOTA_V2_ENABLED, &fs_info->flags))
return 0;
if (btrfs_root_disable_quota(root))
return 0;
WARN_ON_ONCE(btrfs_root_readonly(root));
spin_lock(&fs_info->usrquota_lock);
if (!fs_info->usrquota_root)
goto out;
// Get uid after usrquota_lock, so that uid won't changed by btrfs_usrquota_transfer().
uid = __kuid_val(inode->i_uid);
usrquota = add_usrquota_rb(fs_info, ref_root, uid);
if (IS_ERR(usrquota)) {
ret = PTR_ERR(usrquota);
goto out;
}
add_bytes = round_up(add_bytes, fs_info->sectorsize);
del_bytes = round_up(del_bytes, fs_info->sectorsize);
#ifdef USRQUOTA_DEBUG
printk(KERN_INFO "btrfs_usrquota_syno_accounting debug: root = %llu, ino = %lu, "
"uid = %llu, used = %llu, type = %d, add_bytes = %llu, del_bytes = %llu",
ref_root, inode->i_ino, uid, usrquota->uq_rfer_used, type, add_bytes, del_bytes);
#endif /* USRQUOTA_DEBUG */
switch (type) {
case ADD_QUOTA_RESCAN:
usrquota->uq_rfer_used += add_bytes;
break;
case UPDATE_QUOTA_FREE_RESERVED:
usrquota_free_reserve(fs_info, usrquota, b_inode, add_bytes);
/* fall through */
case UPDATE_QUOTA:
if (btrfs_quota_rescan_check(root, ino)) {
usrquota->uq_rfer_used += add_bytes;
if (usrquota->uq_rfer_used < del_bytes) {
if (!root->invalid_quota)
WARN_ONCE(1, "user quota %llu:%llu ref underflow, "
"have %llu to free %llu", ref_root, uid,
usrquota->uq_rfer_used, del_bytes);
usrquota->uq_rfer_used = 0;
usrquota->need_rescan = true;
} else
usrquota->uq_rfer_used -= del_bytes;
}
break;
}
usrquota_dirty(fs_info, usrquota);
out:
spin_unlock(&fs_info->usrquota_lock);
return ret;
}
// Similar to btrfs_usrquota_syno_accounting().
int btrfs_usrquota_syno_v1_accounting(struct btrfs_trans_handle *trans,
struct btrfs_quota_account_rec *record)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_usrquota *usrquota;
struct inode *inode = record->inode;
struct btrfs_inode *binode;
u64 ref_root = record->ref_root;
u64 num_bytes = record->num_bytes;
u64 reserved = record->reserved;
u64 uid = record->uid;
int sign = record->sign;
int ret = 0;
bool fast_chown;
if (!is_fstree(ref_root))
return -EINVAL;
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags))
return 0;
spin_lock(&fs_info->usrquota_lock);
if (!fs_info->usrquota_root)
goto out;
if (inode)
uid = __kuid_val(inode->i_uid);
fast_chown = btrfs_usrquota_fast_chown_enable(inode);
usrquota = add_usrquota_rb(fs_info, ref_root, uid);
if (IS_ERR(usrquota)) {
ret = PTR_ERR(usrquota);
goto out;
}
num_bytes = round_up(num_bytes, fs_info->sectorsize);
reserved = round_up(reserved, fs_info->sectorsize);
// Update user quota.
if (unlikely(sign < 0 && usrquota->uq_rfer_used < num_bytes)) {
/*WARN_ONCE(1, "user quota root %llu uid %llu ref underflow, "
"have %llu to free %llu", ref_root, uid,
usrquota->uq_rfer_used, num_bytes);*/
usrquota->uq_rfer_used = 0;
} else
usrquota->uq_rfer_used += sign * num_bytes;
// Update user quota reserve.
if (unlikely(usrquota->uq_reserved < reserved)) {
WARN_ONCE(1, "user quota root %llu uid %llu reserved space underflow, "
"have %llu to free %llu", ref_root, uid,
usrquota->uq_reserved, reserved);
usrquota->uq_reserved = 0;
} else
usrquota->uq_reserved -= reserved;
// Update in-memory inode's quota for fast chown.
if (fast_chown) {
binode = BTRFS_I(inode);
if (unlikely(binode->uq_reserved < reserved)) {
WARN_ONCE(1, "inode %llu:%lu uq_reserved underflow, "
"have %llu to free %llu", ref_root, inode->i_ino,
binode->uq_reserved, reserved);
binode->uq_reserved = 0;
} else
binode->uq_reserved -= reserved;
if (unlikely(sign < 0 && (binode->uq_rfer_used < num_bytes))) {
/*WARN_ONCE(1, "inode %llu:%lu uq ref underflow, "
"have %llu to free %llu", ref_root, inode->i_ino,
binode->uq_rfer_used, num_bytes);*/
binode->uq_rfer_used = 0;
} else
binode->uq_rfer_used += sign * num_bytes;
}
usrquota_dirty(fs_info, usrquota);
out:
spin_unlock(&fs_info->usrquota_lock);
if (!ret && fast_chown) {
struct btrfs_block_rsv *rsv = trans->block_rsv;
if (test_bit(BTRFS_INODE_USRQUOTA_META_RESERVED, &BTRFS_I(inode)->runtime_flags)) {
trans->block_rsv = &BTRFS_I(inode)->block_rsv;
} else {
trans->block_rsv = NULL;
}
ret = btrfs_update_inode_fallback(trans, BTRFS_I(inode)->root, inode);
trans->block_rsv = rsv;
if (ret)
btrfs_abort_transaction(trans, ret);
}
return ret;
}
/*
* Similar to btrfs_usrquota_syno_accounting(), but used only in rescan, where
* we don't have in-memory inode.
*/
int btrfs_usrquota_syno_accounting_rescan(struct btrfs_root *root, u64 uid, u64 num_bytes)
{
struct btrfs_usrquota *usrquota;
struct btrfs_fs_info *fs_info = root->fs_info;
u64 subvol_id = root->root_key.objectid;
int ret = 0;
if (num_bytes == 0)
return 0;
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags))
return 0;
usrquota_ro_subvol_check(fs_info, root);
spin_lock(&fs_info->usrquota_lock);
if (!fs_info->usrquota_root)
goto out;
num_bytes = round_up(num_bytes, fs_info->sectorsize);
usrquota = add_usrquota_rb(fs_info, subvol_id, uid);
if (IS_ERR(usrquota)) {
ret = PTR_ERR(usrquota);
goto out;
}
usrquota->uq_rfer_used += num_bytes;
usrquota_dirty(fs_info, usrquota);
out:
spin_unlock(&fs_info->usrquota_lock);
return ret;
}
int btrfs_reset_usrquota_status(struct btrfs_trans_handle *trans)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *usrquota_root = fs_info->usrquota_root;
struct btrfs_path *path = NULL;
struct btrfs_usrquota_status_item *ptr;
struct extent_buffer *leaf;
struct btrfs_key key;
int ret;
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (!fs_info->usrquota_root) {
ret = -ENOENT;
goto out;
}
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
key.objectid = 0;
key.type = BTRFS_USRQUOTA_STATUS_KEY;
key.offset = 0;
ret = btrfs_search_slot(trans, usrquota_root, &key, path, 0, 1);
if (ret)
goto out;
leaf = path->nodes[0];
ptr = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_usrquota_status_item);
fs_info->usrquota_flags &= ~BTRFS_USRQUOTA_STATUS_FLAG_INCONSISTENT;
btrfs_set_usrquota_status_flags(leaf, ptr, fs_info->usrquota_flags);
btrfs_set_usrquota_status_generation(leaf, ptr, trans->transid);
btrfs_set_usrquota_status_version(leaf, ptr, BTRFS_USRQUOTA_V2_STATUS_VERSION);
btrfs_mark_buffer_dirty(leaf);
out:
btrfs_free_path(path);
mutex_unlock(&fs_info->usrquota_ioctl_lock);
return ret;
}
int btrfs_syno_usrquota_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_usrquota_limit_item *ptr;
struct btrfs_usrquota *usrquota;
u64 subvol_id = 0;
int ret = 0;
int slot;
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (!fs_info->usrquota_root) {
ret = -ESRCH;
goto out;
}
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags)) {
ret = -ESRCH;
goto out;
}
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
path->reada = READA_FORWARD_ALWAYS;
key.objectid = BTRFS_USRQUOTA_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_USRQUOTA_LIMIT_KEY;
key.offset = 0;
again:
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);
// We may have many info items before us, jump to the limit item.
if (found_key.type < BTRFS_USRQUOTA_LIMIT_KEY) {
btrfs_release_path(path);
key.objectid = found_key.objectid;
key.type = BTRFS_USRQUOTA_LIMIT_KEY;
key.offset = 0;
goto again;
}
// BTRFS_USRQUOTA_COMPAT_KEY?
if (found_key.type > BTRFS_USRQUOTA_LIMIT_KEY) {
btrfs_release_path(path);
key.objectid = found_key.objectid + 1;
key.type = BTRFS_USRQUOTA_LIMIT_KEY;
key.offset = 0;
goto again;
}
ptr = btrfs_item_ptr(leaf, slot,
struct btrfs_usrquota_limit_item);
if (subvol_id != found_key.objectid) {
if (subvol_id)
usrquota_subtree_unload(fs_info, subvol_id);
subvol_id = found_key.objectid;
ret = usrquota_subtree_load(fs_info, subvol_id);
if (ret) {
btrfs_release_path(path);
key.objectid = subvol_id + 1;
key.type = BTRFS_USRQUOTA_LIMIT_KEY;
key.offset = 0;
subvol_id = 0;
goto again;
}
}
spin_lock(&fs_info->usrquota_lock);
usrquota = add_usrquota_rb(fs_info,
found_key.objectid, found_key.offset);
if (!IS_ERR(usrquota) && usrquota->uq_rfer_soft == 0
&& usrquota->uq_rfer_hard == 0) {
usrquota->uq_rfer_soft = btrfs_usrquota_limit_rfer_soft(leaf, ptr);
usrquota->uq_rfer_hard = btrfs_usrquota_limit_rfer_hard(leaf, ptr);
usrquota->update_limit = true;
usrquota_dirty(fs_info, usrquota);
}
spin_unlock(&fs_info->usrquota_lock);
ret = btrfs_next_item(old_root, path);
if (ret)
break;
}
out:
if (subvol_id)
usrquota_subtree_unload(fs_info, subvol_id);
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->usrquota_ioctl_lock);
if (ret > 0)
ret = 0;
return ret;
}
void btrfs_usrquota_zero_tracking(struct btrfs_fs_info *fs_info, u64 subvol_id)
{
struct btrfs_usrquota *usrquota;
struct rb_node *node;
int ret;
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags))
return;
/*
* We may have no user quota record in volume migration case.
* No need to print error.
*/
ret = usrquota_subtree_load(fs_info, subvol_id);
if (ret)
return;
spin_lock(&fs_info->usrquota_lock);
if (!fs_info->usrquota_root) {
spin_unlock(&fs_info->usrquota_lock);
return;
}
node = find_usrquota_first_rb(fs_info, subvol_id);
while (node) {
usrquota = rb_entry(node, struct btrfs_usrquota, uq_node);
node = rb_next(node);
if (usrquota->uq_objectid > subvol_id)
break;
usrquota->uq_rfer_used = 0;
usrquota->uq_generation = 0;
usrquota_dirty(fs_info, usrquota);
}
spin_unlock(&fs_info->usrquota_lock);
usrquota_subtree_unload(fs_info, subvol_id);
}
int btrfs_usrquota_v1_transfer(struct inode *inode, kuid_t new_uid)
{
struct btrfs_usrquota *usrquota_orig;
struct btrfs_usrquota *usrquota_dest;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_fs_info *fs_info = root->fs_info;
u64 rootid = root->root_key.objectid;
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_file_extent_item *fi;
struct btrfs_trans_handle *trans;
u64 disko;
int ret = 0;
int no_quota = 0;
u64 num_bytes = 0;
int type;
u64 datal, diskl;
struct btrfs_inode *binode = BTRFS_I(inode);
struct quota_check qc;
u64 inflight_num_bytes = 0;
u64 uid;
if (btrfs_usrquota_fast_chown_enable(inode))
goto transfer;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
// flush delayed write and wait for it
btrfs_wait_ordered_range(inode, 0, (u64)-1);
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto search_end;
}
ret = btrfs_run_delayed_refs(trans, BTRFS_USRQUOTA_DELAYED_REF_SCAN);
if (ret) {
btrfs_end_transaction(trans);
goto search_end;
}
ret = btrfs_end_transaction(trans);
if (ret)
goto search_end;
key.objectid = BTRFS_I(inode)->location.objectid;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = 0;
again:
ret = btrfs_search_slot_for_read(root, &key, path, 1, 0);
if (ret) {
if (ret == 1) /* found nothing */
ret = 0;
goto search_end;
}
while (1) {
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.objectid != key.objectid)
break;
if (found_key.type != BTRFS_EXTENT_DATA_KEY)
break;
fi = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_file_extent_item);
type = btrfs_file_extent_type(leaf, fi);
if (type == BTRFS_FILE_EXTENT_REG || type == BTRFS_FILE_EXTENT_PREALLOC) {
disko = btrfs_file_extent_disk_bytenr(leaf, fi);
diskl = btrfs_file_extent_disk_num_bytes(leaf, fi);
datal = btrfs_file_extent_num_bytes(leaf, fi);
if (!disko)
break;
key.offset = found_key.offset + datal;
btrfs_release_path(path);
trans = btrfs_join_transaction(root);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto search_end;
}
qc.bytenr = disko;
qc.root_objectid = rootid;
qc.ino = inode->i_ino;
qc.offset = found_key.offset;
qc.in_run_delayed = false;
no_quota = check_root_inode_ref(trans, &qc);
ret = btrfs_end_transaction(trans);
if (ret)
goto search_end;
if (no_quota < 0)
goto search_end;
if (!no_quota)
num_bytes += diskl;
goto again;
}
cond_resched();
ret = btrfs_next_item(root, path);
if (ret) {
if (ret < 0)
goto search_end;
ret = 0;
break;
}
}
search_end:
btrfs_free_path(path);
if (ret)
return ret;
transfer:
spin_lock(&fs_info->usrquota_lock);
if (!fs_info->usrquota_root)
goto unlock;
if (binode->flags & BTRFS_INODE_UQ_REF_USED)
num_bytes = binode->uq_rfer_used;
inflight_num_bytes = binode->uq_reserved;
uid = __kuid_val(inode->i_uid);
usrquota_orig = add_usrquota_rb(fs_info, rootid, uid);
if (IS_ERR(usrquota_orig)) {
ret = PTR_ERR(usrquota_orig);
goto unlock;
}
usrquota_dest = add_usrquota_rb(fs_info, rootid, (u64)__kuid_val(new_uid));
if (IS_ERR(usrquota_dest)) {
ret = PTR_ERR(usrquota_dest);
goto unlock;
}
if (usrquota_dest->uq_rfer_hard && !capable(CAP_SYS_RESOURCE)) {
if (usrquota_dest->uq_rfer_used + usrquota_dest->uq_reserved +
num_bytes + inflight_num_bytes > usrquota_dest->uq_rfer_hard) {
ret = -EDQUOT;
goto unlock;
}
}
if (unlikely(usrquota_orig->uq_rfer_used < num_bytes)) {
/*WARN_ONCE(1, "user quota chown %llu:%llu ref underflow, "
"have %llu to free %llu", rootid, uid,
usrquota_orig->uq_rfer_used, num_bytes);*/
usrquota_orig->uq_rfer_used = 0;
} else
usrquota_orig->uq_rfer_used -= num_bytes;
usrquota_dest->uq_rfer_used += num_bytes;
if (unlikely(usrquota_orig->uq_reserved < inflight_num_bytes)) {
WARN_ONCE(1, "user quota chown %llu/%lu reserved underflow, "
"have %llu to free %llu", rootid, inode->i_ino,
usrquota_orig->uq_reserved, inflight_num_bytes);
usrquota_orig->uq_reserved = 0;
} else
usrquota_orig->uq_reserved -= inflight_num_bytes;
usrquota_dest->uq_reserved += inflight_num_bytes;
inode->i_uid = new_uid; // Do this inside of usrquota_lock.
usrquota_dirty(fs_info, usrquota_orig);
usrquota_dirty(fs_info, usrquota_dest);
unlock:
spin_unlock(&fs_info->usrquota_lock);
return ret;
}
// For syno quota v2.
int btrfs_usrquota_transfer(struct inode *inode, kuid_t new_uid)
{
struct btrfs_usrquota *usrquota_from, *usrquota_to;
struct btrfs_inode *b_inode = BTRFS_I(inode);
struct btrfs_root *root = b_inode->root;
struct btrfs_fs_info *fs_info = root->fs_info;
u64 uid;
u64 ref_root = root->root_key.objectid;
u64 ino = b_inode->location.objectid;
loff_t num_bytes;
bool enforce = true;
int ret = 0;
if (!is_fstree(ref_root))
return 0;
if (capable(CAP_SYS_RESOURCE))
enforce = false;
usrquota_ro_subvol_check(fs_info, root);
down_write(&root->rescan_lock);
spin_lock(&fs_info->usrquota_lock);
if (!fs_info->usrquota_root)
goto out;
uid = __kuid_val(inode->i_uid);
usrquota_from = add_usrquota_rb(fs_info, ref_root, uid);
if (IS_ERR(usrquota_from)) {
ret = PTR_ERR(usrquota_from);
goto out;
}
usrquota_to = add_usrquota_rb(fs_info, ref_root, (u64)__kuid_val(new_uid));
if (IS_ERR(usrquota_to)) {
ret = PTR_ERR(usrquota_to);
goto out;
}
num_bytes = inode_get_bytes(inode);
num_bytes = round_up(num_bytes, fs_info->sectorsize);
#ifdef USRQUOTA_DEBUG
printk(KERN_INFO "btrfs_usrquota_transfer debug: root = %llu, ino = %lu, "
"uid_from = %llu, uid_to = %llu, used = %llu, num_bytes = %llu",
ref_root, inode->i_ino, uid, (u64)__kuid_val(new_uid),
usrquota_from->uq_rfer_used, num_bytes);
#endif /* USRQUOTA_DEBUG */
if (enforce && usrquota_to->uq_rfer_hard && !root->invalid_quota) {
if (usrquota_to->uq_rfer_used + usrquota_to->uq_reserved +
num_bytes + b_inode->uq_reserved >
usrquota_to->uq_rfer_hard) {
ret = -EDQUOT;
goto out;
}
}
if (btrfs_quota_rescan_check(root, ino)) {
usrquota_to->uq_rfer_used += num_bytes;
if (usrquota_from->uq_rfer_used < num_bytes && !root->invalid_quota) {
WARN_ONCE(1, "user quota chown %llu:%llu ref underflow, "
"have %llu to free %llu", ref_root, uid,
usrquota_from->uq_rfer_used, num_bytes);
usrquota_from->uq_rfer_used = 0;
usrquota_to->need_rescan = true;
} else
usrquota_from->uq_rfer_used -= num_bytes;
}
usrquota_to->uq_reserved += b_inode->uq_reserved;
if (usrquota_from->uq_reserved < b_inode->uq_reserved) {
WARN_ONCE(1, "user quota chown %llu/%llu reserved underflow, "
"have %llu to free %llu", ref_root, ino,
usrquota_from->uq_reserved, b_inode->uq_reserved);
usrquota_from->uq_reserved = 0;
} else
usrquota_from->uq_reserved -= b_inode->uq_reserved;
usrquota_dirty(fs_info, usrquota_from);
usrquota_dirty(fs_info, usrquota_to);
inode->i_uid = new_uid; // Do this inside of usrquota_lock.
out:
spin_unlock(&fs_info->usrquota_lock);
up_write(&root->rescan_lock);
return ret;
}
/*
* called from commit_transaction. Writes all changed usrquota to disk.
*/
int btrfs_run_usrquota(struct btrfs_trans_handle *trans)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *subvol_root, *next;
int ret = 0;
if (!fs_info->usrquota_root)
goto out;
spin_lock(&fs_info->usrquota_lock);
while (!list_empty(&fs_info->dirty_usrquota)) {
struct btrfs_usrquota tmp_usrquota;
struct btrfs_usrquota *usrquota;
usrquota = list_first_entry(&fs_info->dirty_usrquota,
struct btrfs_usrquota, uq_dirty);
list_del_init(&usrquota->uq_dirty);
// Copy things out since we may free usrquota later.
memcpy(&tmp_usrquota, usrquota, sizeof(tmp_usrquota));
usrquota->need_rescan = false;
usrquota->update_limit = false;
/*
* Remove empty record. To mark tree loaded,
* we need to keep the last record in the tree.
*/
if (!usrquota->uq_rfer_hard && !usrquota->uq_rfer_soft
&& !usrquota->uq_rfer_used && !usrquota->uq_reserved && usrquota->uq_uid) {
del_usrquota_rb(fs_info, usrquota);
usrquota = NULL;
spin_unlock(&fs_info->usrquota_lock);
ret = remove_usrquota_item(trans, tmp_usrquota.uq_objectid,
tmp_usrquota.uq_uid, BTRFS_USRQUOTA_INFO_KEY);
} else {
spin_unlock(&fs_info->usrquota_lock);
ret = update_usrquota_info_item(trans, tmp_usrquota.uq_objectid,
tmp_usrquota.uq_uid, tmp_usrquota.uq_rfer_used);
if ((ret || tmp_usrquota.need_rescan) &&
test_bit(BTRFS_FS_SYNO_USRQUOTA_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,
tmp_usrquota.uq_objectid, &updater);
}
if (tmp_usrquota.update_limit) {
ret = update_usrquota_limit_item(trans, tmp_usrquota.uq_objectid, tmp_usrquota.uq_uid,
tmp_usrquota.uq_rfer_soft, tmp_usrquota.uq_rfer_hard);
if (ret)
fs_info->usrquota_flags |= BTRFS_USRQUOTA_STATUS_FLAG_INCONSISTENT;
}
}
spin_lock(&fs_info->usrquota_lock);
}
if (test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) ||
test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags))
fs_info->usrquota_flags |= BTRFS_USRQUOTA_STATUS_FLAG_ON;
else
fs_info->usrquota_flags &= ~BTRFS_USRQUOTA_STATUS_FLAG_ON;
spin_unlock(&fs_info->usrquota_lock);
ret = update_usrquota_status_item(trans);
if (ret)
fs_info->usrquota_flags |= BTRFS_USRQUOTA_STATUS_FLAG_INCONSISTENT;
if (test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags)) {
ret = update_usrquota_compat_item(trans, fs_info, fs_info->usrquota_root);
if (ret)
fs_info->usrquota_flags |= BTRFS_USRQUOTA_STATUS_FLAG_INCONSISTENT;
}
out:
mutex_lock(&fs_info->usrquota_ro_roots_lock);
spin_lock(&fs_info->usrquota_lock);
list_for_each_entry_safe(subvol_root, next, &fs_info->usrquota_ro_roots, usrquota_ro_root) {
if (subvol_root->usrquota_loaded_gen + USRQUOTA_RO_SUBVOL_EXIST_GEN < fs_info->generation) {
list_del_init(&subvol_root->usrquota_ro_root);
btrfs_put_root(subvol_root);
btrfs_debug(fs_info, "Unload ro sub [id:%llu] uq subtree [%llu, %llu]",
subvol_root->root_key.objectid, subvol_root->usrquota_loaded_gen,
fs_info->generation);
usrquota_subtree_unload_nolock(fs_info, subvol_root->root_key.objectid);
}
}
spin_unlock(&fs_info->usrquota_lock);
mutex_unlock(&fs_info->usrquota_ro_roots_lock);
return ret;
}
int btrfs_usrquota_syno_reserve(struct btrfs_inode *b_inode, u64 num_bytes)
{
if (btrfs_root_disable_quota(b_inode->root))
return 0;
num_bytes = round_up(num_bytes, b_inode->root->fs_info->sectorsize);
return usrquota_reserve(b_inode, num_bytes, true);
}
/*
* Return 1 if we don't reserve user quota, but it's not an EDQUOT error.
* Caller is allowed to write.
*/
int usrquota_reserve(struct btrfs_inode *b_inode, u64 num_bytes, bool enforce)
{
struct btrfs_usrquota *usrquota;
struct btrfs_root *root = b_inode->root;
struct btrfs_fs_info *fs_info = root->fs_info;
u64 ref_root = root->root_key.objectid;
u64 uid;
int ret = 0;
if (!is_fstree(ref_root))
return 0;
if (num_bytes == 0)
return 0;
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags))
return 1;
if (test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags) &&
capable(CAP_SYS_RESOURCE))
enforce = false;
usrquota_ro_subvol_check(fs_info, root);
spin_lock(&fs_info->usrquota_lock);
if (!fs_info->usrquota_root) {
ret = 1;
goto out;
}
// Get uid after usrquota_lock, so that uid won't changed by btrfs_usrquota_transfer().
uid = __kuid_val(b_inode->vfs_inode.i_uid);
usrquota = add_usrquota_rb(fs_info, ref_root, uid);
if (IS_ERR(usrquota)) {
ret = 1;
goto out;
}
#ifdef USRQUOTA_DEBUG
printk(KERN_INFO "usrquota_reserve debug: root = %llu, ino = %lu, uid = %llu, used = %llu, "
"reserved = %llu, want = %llu, limit = %llu",
ref_root, b_inode->vfs_inode.i_ino, uid, usrquota->uq_rfer_used,
usrquota->uq_reserved, num_bytes, usrquota->uq_rfer_hard);
#endif /* USRQUOTA_DEBUG */
if (enforce && usrquota->uq_rfer_hard && !root->invalid_quota) {
if (usrquota->uq_rfer_used + usrquota->uq_reserved + num_bytes > usrquota->uq_rfer_hard) {
ret = -EDQUOT;
goto out;
}
}
usrquota->uq_reserved += num_bytes;
if (test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags) ||
btrfs_usrquota_fast_chown_enable(&b_inode->vfs_inode))
b_inode->uq_reserved += num_bytes;
out:
spin_unlock(&fs_info->usrquota_lock);
return ret;
}
void btrfs_usrquota_syno_free(struct btrfs_inode *b_inode, u64 num_bytes)
{
struct btrfs_usrquota *usrquota;
struct btrfs_root *root = b_inode->root;
struct btrfs_fs_info *fs_info = root->fs_info;
u64 ref_root = root->root_key.objectid;
u64 uid;
if (!is_fstree(ref_root))
return;
if (num_bytes == 0)
return;
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags))
return;
if (btrfs_root_disable_quota(root))
return;
spin_lock(&fs_info->usrquota_lock);
if (!fs_info->usrquota_root)
goto unlock;
// Get uid after usrquota_lock, so that uid won't changed by btrfs_usrquota_transfer().
uid = __kuid_val(b_inode->vfs_inode.i_uid);
usrquota = find_usrquota_rb(fs_info, ref_root, uid);
if (!usrquota)
goto unlock;
num_bytes = round_up(num_bytes, fs_info->sectorsize);
usrquota_free_reserve(fs_info, usrquota, b_inode, num_bytes);
unlock:
spin_unlock(&fs_info->usrquota_lock);
return;
}
/*
* Calculate number of usrquota_{info/limit}_item that need to be reserved for space
* when taking snapshot.
*/
int btrfs_usrquota_calc_reserve_snap(struct btrfs_root *root,
u64 copy_limit_from, u64 *reserve_items)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_path *path = NULL;
struct extent_buffer *leaf;
struct btrfs_key key;
struct btrfs_usrquota_root_item *item;
int ret = 0;
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags)) {
goto unlock_ioctl;
}
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto unlock_ioctl;
}
key.objectid = root->root_key.objectid;
key.type = BTRFS_USRQUOTA_ROOT_KEY;
key.offset = 0;
*reserve_items = 0;
//calc_info_items:
ret = btrfs_search_slot(NULL, fs_info->usrquota_root, &key, path, 0, 0);
if (ret < 0)
goto unlock_tree;
if (ret == 1)
goto calc_limit_items;
leaf = path->nodes[0];
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_usrquota_root_item);
*reserve_items += btrfs_usrquota_root_info_item_cnt(leaf, item);
calc_limit_items:
if (copy_limit_from == 0)
goto success;
btrfs_release_path(path);
key.objectid = copy_limit_from;
ret = btrfs_search_slot(NULL, fs_info->usrquota_root, &key, path, 0, 0);
if (ret < 0)
goto unlock_tree;
if (ret == 1)
goto success;
leaf = path->nodes[0];
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_usrquota_root_item);
*reserve_items += btrfs_usrquota_root_limit_item_cnt(leaf, item);
success:
ret = 0;
unlock_tree:
btrfs_free_path(path);
unlock_ioctl:
mutex_unlock(&fs_info->usrquota_ioctl_lock);
return ret;
}
int btrfs_usrquota_mksubvol(struct btrfs_trans_handle *trans, u64 objectid)
{
int ret = 0;
struct btrfs_usrquota *usrquota;
struct btrfs_fs_info *fs_info = trans->fs_info;
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags))
return 0;
// insert dummy node
spin_lock(&fs_info->usrquota_lock);
if (!fs_info->usrquota_root)
goto unlock;
usrquota = add_usrquota_dummy_rb_nocheck(fs_info, objectid);
if (IS_ERR(usrquota)) {
btrfs_err(fs_info, "failed to add_usrquota_rb %ld", PTR_ERR(usrquota));
ret = PTR_ERR(usrquota);
goto unlock;
}
unlock:
spin_unlock(&fs_info->usrquota_lock);
return ret;
}
int btrfs_usrquota_mksnap(struct btrfs_trans_handle *trans,
u64 srcid, u64 objectid,
bool readonly, u64 copy_limit_from)
{
int ret = 0;
int src_loaded = 0;
int copy_loaded = 0;
struct rb_node *node;
struct btrfs_usrquota *usrquota_new;
struct btrfs_usrquota *usrquota_orig;
struct btrfs_fs_info *fs_info = trans->fs_info;
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags)) {
goto out;
}
BUG_ON(!fs_info->usrquota_root);
// create dummy node
spin_lock(&fs_info->usrquota_lock);
usrquota_new = add_usrquota_dummy_rb_nocheck(fs_info, objectid);
if (IS_ERR(usrquota_new)) {
btrfs_err(fs_info, "failed to add_usrquota_rb %ld", PTR_ERR(usrquota_new));
ret = PTR_ERR(usrquota_new);
goto unlock;
}
spin_unlock(&fs_info->usrquota_lock);
if (!copy_limit_from)
goto copy_info_items;
ret = usrquota_subtree_load(fs_info, copy_limit_from);
if (ret) {
btrfs_err(fs_info, "failed to load usrquota subtree %llu", copy_limit_from);
goto out;
}
copy_loaded = 1;
spin_lock(&fs_info->usrquota_lock);
node = find_usrquota_first_rb(fs_info, copy_limit_from);
while (node) {
usrquota_orig = rb_entry(node, struct btrfs_usrquota, uq_node);
node = rb_next(node);
if (usrquota_orig->uq_objectid > copy_limit_from)
break;
if (!usrquota_orig->uq_rfer_soft && !usrquota_orig->uq_rfer_hard)
continue;
usrquota_new = add_usrquota_rb_nocheck(fs_info, objectid, usrquota_orig->uq_uid);
if (IS_ERR(usrquota_new)) {
btrfs_err(fs_info, "failed to add_usrquota_rb %ld", PTR_ERR(usrquota_new));
ret = PTR_ERR(usrquota_new);
goto unlock;
}
usrquota_new->uq_rfer_soft = usrquota_orig->uq_rfer_soft;
usrquota_new->uq_rfer_hard = usrquota_orig->uq_rfer_hard;
}
spin_unlock(&fs_info->usrquota_lock);
cond_resched();
copy_info_items:
ret = usrquota_subtree_load(fs_info, srcid);
if (ret) {
btrfs_err(fs_info, "failed to load usrquota subtree %llu", srcid);
goto out;
}
src_loaded = 1;
spin_lock(&fs_info->usrquota_lock);
node = find_usrquota_first_rb(fs_info, srcid);
while (node) {
usrquota_orig = rb_entry(node, struct btrfs_usrquota, uq_node);
node = rb_next(node);
if (usrquota_orig->uq_objectid > srcid)
break;
usrquota_new = add_usrquota_rb_nocheck(fs_info, objectid, usrquota_orig->uq_uid);
if (IS_ERR(usrquota_new)) {
btrfs_err(fs_info, "failed to add_usrquota_rb %ld", PTR_ERR(usrquota_new));
ret = PTR_ERR(usrquota_new);
goto unlock;
}
usrquota_new->uq_rfer_used = usrquota_orig->uq_rfer_used;
usrquota_new->uq_generation = usrquota_orig->uq_generation;
}
// add info & limit items
node = find_usrquota_first_rb(fs_info, objectid);
while (node) {
usrquota_new = rb_entry(node, struct btrfs_usrquota, uq_node);
node = rb_next(node);
if (usrquota_new->uq_objectid > objectid)
break;
if (usrquota_new->uq_rfer_soft || usrquota_new->uq_rfer_hard) {
spin_unlock(&fs_info->usrquota_lock);
ret = update_usrquota_limit_item(trans, objectid,
usrquota_new->uq_uid,
usrquota_new->uq_rfer_soft,
usrquota_new->uq_rfer_hard);
spin_lock(&fs_info->usrquota_lock);
if (ret) {
fs_info->usrquota_flags |= BTRFS_USRQUOTA_STATUS_FLAG_INCONSISTENT;
break;
}
}
if (usrquota_new->uq_rfer_used || usrquota_new->uq_generation) {
spin_unlock(&fs_info->usrquota_lock);
ret = update_usrquota_info_item(trans, objectid,
usrquota_new->uq_uid,
usrquota_new->uq_rfer_used);
spin_lock(&fs_info->usrquota_lock);
if (ret) {
fs_info->usrquota_flags |= BTRFS_USRQUOTA_STATUS_FLAG_INCONSISTENT;
break;
}
}
}
unlock:
spin_unlock(&fs_info->usrquota_lock);
out:
if (src_loaded)
usrquota_subtree_unload(fs_info, srcid);
if (copy_loaded)
usrquota_subtree_unload(fs_info, copy_limit_from);
if (ret || readonly)
usrquota_subtree_unload(fs_info, objectid);
mutex_unlock(&fs_info->usrquota_ioctl_lock);
return ret;
}
int btrfs_usrquota_delsnap(struct btrfs_trans_handle *trans, struct btrfs_root *subvol_root)
{
int ret = 0;
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *usrquota_root = fs_info->usrquota_root;
struct btrfs_path *path = NULL;
struct btrfs_key key;
struct btrfs_key found_key;
struct extent_buffer *leaf;
u64 rootid = subvol_root->root_key.objectid;
int pending_del_nr = 0;
int pending_del_slot = 0;
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (!usrquota_root) {
ret = -EINVAL;
goto out;
}
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
mutex_lock(&fs_info->usrquota_ro_roots_lock);
if (!list_empty(&subvol_root->usrquota_ro_root)) {
list_del_init(&subvol_root->usrquota_ro_root);
btrfs_put_root(subvol_root);
btrfs_debug(fs_info, "Unload ro sub [id:%llu] uq subtree [%llu, %llu]",
subvol_root->root_key.objectid, subvol_root->usrquota_loaded_gen,
fs_info->generation);
usrquota_subtree_unload(fs_info, subvol_root->root_key.objectid);
}
mutex_unlock(&fs_info->usrquota_ro_roots_lock);
usrquota_subtree_unload(fs_info, rootid);
// copyed from btrfs_truncate_inode_items
key.objectid = rootid;
key.offset = (u64) -1;
key.type = (u8) -1;
search_again:
path->leave_spinning = 1;
ret = btrfs_search_slot(trans, usrquota_root, &key, path, -1, 1);
if (ret < 0) {
goto out;
}
if (ret > 0) {
ret = 0;
if (path->slots[0] == 0) {
btrfs_err(fs_info, "failed to search usrquota");
goto out;
}
path->slots[0]--;
}
while (1) {
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.objectid != rootid)
break;
if (!pending_del_nr) {
pending_del_nr = 1;
pending_del_slot = path->slots[0];
} else {
pending_del_nr++;
pending_del_slot = path->slots[0];
}
if (path->slots[0] == 0) {
if (pending_del_nr) {
ret = btrfs_del_items(trans, usrquota_root, path,
pending_del_slot,
pending_del_nr);
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out;
}
pending_del_nr = 0;
}
btrfs_release_path(path);
goto search_again;
} else {
path->slots[0]--;
}
}
if (pending_del_nr) {
ret = btrfs_del_items(trans, usrquota_root, path,
pending_del_slot, pending_del_nr);
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out;
}
}
out:
btrfs_free_path(path);
mutex_unlock(&fs_info->usrquota_ioctl_lock);
return ret;
}
/*
* struct btrfs_ioctl_usrquota_query_args should be initialized to zero
*/
int btrfs_usrquota_query(struct btrfs_root *root,
struct btrfs_ioctl_usrquota_query_args *uqa)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_usrquota *usrquota;
kuid_t tmp_uid;
u64 rootid = root->root_key.objectid;
u64 kernel_uid;
int ret;
if (unlikely(root->invalid_quota))
return -ESRCH;
tmp_uid = make_kuid(current_user_ns(), (uid_t)uqa->uid);
if (!uid_valid(tmp_uid))
return -EINVAL;
kernel_uid = __kuid_val(tmp_uid);
mutex_lock(&fs_info->usrquota_ioctl_lock);
if (!test_bit(BTRFS_FS_SYNO_USRQUOTA_V1_ENABLED, &fs_info->flags) &&
!test_bit(BTRFS_FS_SYNO_USRQUOTA_V2_ENABLED, &fs_info->flags)) {
ret = -ESRCH;
goto unlock;
}
if (usrquota_subtree_load(fs_info, rootid)) {
ret = -ENOENT;
goto unlock;
}
ret = 0; // It is normal that we have no such entry.
spin_lock(&fs_info->usrquota_lock);
usrquota = find_usrquota_rb(fs_info, rootid, kernel_uid);
if (!usrquota)
goto unload;
uqa->rfer_used = usrquota->uq_rfer_used;
uqa->rfer_soft = usrquota->uq_rfer_soft;
uqa->rfer_hard = usrquota->uq_rfer_hard;
uqa->reserved = usrquota->uq_reserved;
unload:
spin_unlock(&fs_info->usrquota_lock);
usrquota_subtree_unload(fs_info, rootid);
unlock:
mutex_unlock(&fs_info->usrquota_ioctl_lock);
return ret;
}
#ifdef MY_ABC_HERE
static bool check_usrquota_from_disk(struct btrfs_fs_info *fs_info, u64 rootid)
{
int ret;
int slot;
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_root *usrquota_root = fs_info->usrquota_root;
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_usrquota_limit_item *limit_item;
bool has_limit = false;
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
key.objectid = rootid;
key.type = BTRFS_USRQUOTA_LIMIT_KEY;
key.offset = 0;
ret = btrfs_search_slot_for_read(usrquota_root, &key, path, 1, 0);
if (ret < 0)
goto out;
else if (ret) {
ret = 0;
goto out;
}
while (1) {
slot = path->slots[0];
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, slot);
if (found_key.objectid > rootid)
break;
else if (found_key.type != BTRFS_USRQUOTA_LIMIT_KEY)
goto next_item;
limit_item = btrfs_item_ptr(leaf, slot,
struct btrfs_usrquota_limit_item);
if (btrfs_usrquota_limit_rfer_soft(leaf, limit_item) ||
btrfs_usrquota_limit_rfer_hard(leaf, limit_item)) {
has_limit = true;
break;
}
next_item:
ret = btrfs_next_item(usrquota_root, path);
if (ret < 0)
goto out;
else if (ret) {
ret = 0;
break;
}
}
ret = 0;
out:
btrfs_free_path(path);
// When an error occurr, we always treat it as having quota_limt.
return (ret) ? true : has_limit;
}
static bool check_usrquota_from_rbtree(struct rb_node *node,
u64 rootid)
{
struct btrfs_usrquota *usrquota;
bool has_limit = false;
while (node) {
usrquota = rb_entry(node, struct btrfs_usrquota, uq_node);
if (usrquota->uq_objectid > rootid)
break;
else if (usrquota->uq_rfer_soft || usrquota->uq_rfer_hard) {
has_limit = true;
break;
}
node = rb_next(node);
}
return has_limit;
}
void btrfs_check_usrquota_limit(struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
bool has_limit = false;
struct rb_node *node;
u64 rootid = root->root_key.objectid;
spin_lock(&fs_info->usrquota_lock);
if (!fs_info->usrquota_root) {
spin_unlock(&fs_info->usrquota_lock);
return;
}
node = find_usrquota_first_rb(fs_info, rootid);
if (!node) {
// subtree is unloaded, read from disk.
spin_unlock(&fs_info->usrquota_lock);
has_limit = check_usrquota_from_disk(fs_info, rootid);
} else {
has_limit = check_usrquota_from_rbtree(node, rootid);
spin_unlock(&fs_info->usrquota_lock);
}
btrfs_root_set_has_usrquota_limit(root, has_limit);
}
#endif /* MY_ABC_HERE */
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