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ceph: use list instead of rbtree to track cap flushes

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We don't have requirement of searching cap flush by TID. In most cases,
we just need to know TID of the oldest cap flush. List is ideal for this
usage.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2016-07-06 11:12:56 +08:00 committed by Ilya Dryomov
parent 3609404f8c
commit e4500b5e35
5 changed files with 56 additions and 118 deletions
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120
fs/ceph/caps.c
View File

@ -1413,52 +1413,6 @@ int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
return dirty;
}
static void __add_cap_flushing_to_inode(struct ceph_inode_info *ci,
struct ceph_cap_flush *cf)
{
struct rb_node **p = &ci->i_cap_flush_tree.rb_node;
struct rb_node *parent = NULL;
struct ceph_cap_flush *other = NULL;
while (*p) {
parent = *p;
other = rb_entry(parent, struct ceph_cap_flush, i_node);
if (cf->tid < other->tid)
p = &(*p)->rb_left;
else if (cf->tid > other->tid)
p = &(*p)->rb_right;
else
BUG();
}
rb_link_node(&cf->i_node, parent, p);
rb_insert_color(&cf->i_node, &ci->i_cap_flush_tree);
}
static void __add_cap_flushing_to_mdsc(struct ceph_mds_client *mdsc,
struct ceph_cap_flush *cf)
{
struct rb_node **p = &mdsc->cap_flush_tree.rb_node;
struct rb_node *parent = NULL;
struct ceph_cap_flush *other = NULL;
while (*p) {
parent = *p;
other = rb_entry(parent, struct ceph_cap_flush, g_node);
if (cf->tid < other->tid)
p = &(*p)->rb_left;
else if (cf->tid > other->tid)
p = &(*p)->rb_right;
else
BUG();
}
rb_link_node(&cf->g_node, parent, p);
rb_insert_color(&cf->g_node, &mdsc->cap_flush_tree);
}
struct ceph_cap_flush *ceph_alloc_cap_flush(void)
{
return kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL);
@ -1472,10 +1426,10 @@ void ceph_free_cap_flush(struct ceph_cap_flush *cf)
static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc)
{
struct rb_node *n = rb_first(&mdsc->cap_flush_tree);
if (n) {
if (!list_empty(&mdsc->cap_flush_list)) {
struct ceph_cap_flush *cf =
rb_entry(n, struct ceph_cap_flush, g_node);
list_first_entry(&mdsc->cap_flush_list,
struct ceph_cap_flush, g_list);
return cf->tid;
}
return 0;
@ -1516,7 +1470,7 @@ static int __mark_caps_flushing(struct inode *inode,
list_del_init(&ci->i_dirty_item);
cf->tid = ++mdsc->last_cap_flush_tid;
__add_cap_flushing_to_mdsc(mdsc, cf);
list_add_tail(&cf->g_list, &mdsc->cap_flush_list);
*oldest_flush_tid = __get_oldest_flush_tid(mdsc);
if (list_empty(&ci->i_flushing_item)) {
@ -1530,7 +1484,7 @@ static int __mark_caps_flushing(struct inode *inode,
}
spin_unlock(&mdsc->cap_dirty_lock);
__add_cap_flushing_to_inode(ci, cf);
list_add_tail(&cf->i_list, &ci->i_cap_flush_list);
*flush_tid = cf->tid;
return flushing;
@ -1890,10 +1844,10 @@ static int try_flush_caps(struct inode *inode, u64 *ptid)
spin_unlock(&ci->i_ceph_lock);
}
} else {
struct rb_node *n = rb_last(&ci->i_cap_flush_tree);
if (n) {
if (!list_empty(&ci->i_cap_flush_list)) {
struct ceph_cap_flush *cf =
rb_entry(n, struct ceph_cap_flush, i_node);
list_last_entry(&ci->i_cap_flush_list,
struct ceph_cap_flush, i_list);
flush_tid = cf->tid;
}
flushing = ci->i_flushing_caps;
@ -1913,14 +1867,13 @@ static int try_flush_caps(struct inode *inode, u64 *ptid)
static int caps_are_flushed(struct inode *inode, u64 flush_tid)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_cap_flush *cf;
struct rb_node *n;
int ret = 1;
spin_lock(&ci->i_ceph_lock);
n = rb_first(&ci->i_cap_flush_tree);
if (n) {
cf = rb_entry(n, struct ceph_cap_flush, i_node);
if (!list_empty(&ci->i_cap_flush_list)) {
struct ceph_cap_flush * cf =
list_first_entry(&ci->i_cap_flush_list,
struct ceph_cap_flush, i_list);
if (cf->tid <= flush_tid)
ret = 0;
}
@ -2083,7 +2036,6 @@ static int __kick_flushing_caps(struct ceph_mds_client *mdsc,
struct inode *inode = &ci->vfs_inode;
struct ceph_cap *cap;
struct ceph_cap_flush *cf;
struct rb_node *n;
int delayed = 0;
u64 first_tid = 0;
u64 oldest_flush_tid;
@ -2092,8 +2044,11 @@ static int __kick_flushing_caps(struct ceph_mds_client *mdsc,
oldest_flush_tid = __get_oldest_flush_tid(mdsc);
spin_unlock(&mdsc->cap_dirty_lock);
while (true) {
spin_lock(&ci->i_ceph_lock);
spin_lock(&ci->i_ceph_lock);
list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
if (cf->tid < first_tid)
continue;
cap = ci->i_auth_cap;
if (!(cap && cap->session == session)) {
pr_err("%p auth cap %p not mds%d ???\n", inode,
@ -2102,18 +2057,6 @@ static int __kick_flushing_caps(struct ceph_mds_client *mdsc,
break;
}
for (n = rb_first(&ci->i_cap_flush_tree); n; n = rb_next(n)) {
cf = rb_entry(n, struct ceph_cap_flush, i_node);
if (cf->tid >= first_tid)
break;
}
if (!n) {
spin_unlock(&ci->i_ceph_lock);
break;
}
cf = rb_entry(n, struct ceph_cap_flush, i_node);
first_tid = cf->tid + 1;
dout("kick_flushing_caps %p cap %p tid %llu %s\n", inode,
@ -2123,7 +2066,10 @@ static int __kick_flushing_caps(struct ceph_mds_client *mdsc,
__ceph_caps_wanted(ci),
cap->issued | cap->implemented,
cf->caps, cf->tid, oldest_flush_tid);
spin_lock(&ci->i_ceph_lock);
}
spin_unlock(&ci->i_ceph_lock);
return delayed;
}
@ -2995,23 +2941,19 @@ static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
struct ceph_cap_flush *cf;
struct rb_node *n;
struct ceph_cap_flush *cf, *tmp_cf;
LIST_HEAD(to_remove);
unsigned seq = le32_to_cpu(m->seq);
int dirty = le32_to_cpu(m->dirty);
int cleaned = 0;
int drop = 0;
n = rb_first(&ci->i_cap_flush_tree);
while (n) {
cf = rb_entry(n, struct ceph_cap_flush, i_node);
n = rb_next(&cf->i_node);
list_for_each_entry_safe(cf, tmp_cf, &ci->i_cap_flush_list, i_list) {
if (cf->tid == flush_tid)
cleaned = cf->caps;
if (cf->tid <= flush_tid) {
rb_erase(&cf->i_node, &ci->i_cap_flush_tree);
list_add_tail(&cf->list, &to_remove);
list_del(&cf->i_list);
list_add_tail(&cf->i_list, &to_remove);
} else {
cleaned &= ~cf->caps;
if (!cleaned)
@ -3033,12 +2975,12 @@ static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
spin_lock(&mdsc->cap_dirty_lock);
if (!list_empty(&to_remove)) {
list_for_each_entry(cf, &to_remove, list)
rb_erase(&cf->g_node, &mdsc->cap_flush_tree);
u64 oldest_flush_tid;
list_for_each_entry(cf, &to_remove, i_list)
list_del(&cf->g_list);
n = rb_first(&mdsc->cap_flush_tree);
cf = n ? rb_entry(n, struct ceph_cap_flush, g_node) : NULL;
if (!cf || cf->tid > flush_tid)
oldest_flush_tid = __get_oldest_flush_tid(mdsc);
if (oldest_flush_tid == 0 || oldest_flush_tid > flush_tid)
wake_up_all(&mdsc->cap_flushing_wq);
}
@ -3075,8 +3017,8 @@ static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
while (!list_empty(&to_remove)) {
cf = list_first_entry(&to_remove,
struct ceph_cap_flush, list);
list_del(&cf->list);
struct ceph_cap_flush, i_list);
list_del(&cf->i_list);
ceph_free_cap_flush(cf);
}
if (drop)

2
fs/ceph/inode.c
View File

@ -468,7 +468,7 @@ struct inode *ceph_alloc_inode(struct super_block *sb)
INIT_LIST_HEAD(&ci->i_dirty_item);
INIT_LIST_HEAD(&ci->i_flushing_item);
ci->i_prealloc_cap_flush = NULL;
ci->i_cap_flush_tree = RB_ROOT;
INIT_LIST_HEAD(&ci->i_cap_flush_list);
init_waitqueue_head(&ci->i_cap_wq);
ci->i_hold_caps_min = 0;
ci->i_hold_caps_max = 0;

41
fs/ceph/mds_client.c
View File

@ -1148,19 +1148,17 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
invalidate = true;
while (true) {
struct rb_node *n = rb_first(&ci->i_cap_flush_tree);
if (!n)
break;
cf = rb_entry(n, struct ceph_cap_flush, i_node);
rb_erase(&cf->i_node, &ci->i_cap_flush_tree);
list_add(&cf->list, &to_remove);
while (!list_empty(&ci->i_cap_flush_list)) {
cf = list_first_entry(&ci->i_cap_flush_list,
struct ceph_cap_flush, i_list);
list_del(&cf->i_list);
list_add(&cf->i_list, &to_remove);
}
spin_lock(&mdsc->cap_dirty_lock);
list_for_each_entry(cf, &to_remove, list)
rb_erase(&cf->g_node, &mdsc->cap_flush_tree);
list_for_each_entry(cf, &to_remove, i_list)
list_del(&cf->g_list);
if (!list_empty(&ci->i_dirty_item)) {
pr_warn_ratelimited(
@ -1184,7 +1182,7 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
spin_unlock(&mdsc->cap_dirty_lock);
if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
list_add(&ci->i_prealloc_cap_flush->list, &to_remove);
list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
ci->i_prealloc_cap_flush = NULL;
}
}
@ -1192,8 +1190,8 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
while (!list_empty(&to_remove)) {
struct ceph_cap_flush *cf;
cf = list_first_entry(&to_remove,
struct ceph_cap_flush, list);
list_del(&cf->list);
struct ceph_cap_flush, i_list);
list_del(&cf->i_list);
ceph_free_cap_flush(cf);
}
@ -1499,17 +1497,18 @@ static int check_capsnap_flush(struct ceph_inode_info *ci,
static int check_caps_flush(struct ceph_mds_client *mdsc,
u64 want_flush_tid)
{
struct rb_node *n;
struct ceph_cap_flush *cf;
int ret = 1;
spin_lock(&mdsc->cap_dirty_lock);
n = rb_first(&mdsc->cap_flush_tree);
cf = n ? rb_entry(n, struct ceph_cap_flush, g_node) : NULL;
if (cf && cf->tid <= want_flush_tid) {
dout("check_caps_flush still flushing tid %llu <= %llu\n",
cf->tid, want_flush_tid);
ret = 0;
if (!list_empty(&mdsc->cap_flush_list)) {
struct ceph_cap_flush *cf =
list_first_entry(&mdsc->cap_flush_list,
struct ceph_cap_flush, g_list);
if (cf->tid <= want_flush_tid) {
dout("check_caps_flush still flushing tid "
"%llu <= %llu\n", cf->tid, want_flush_tid);
ret = 0;
}
}
spin_unlock(&mdsc->cap_dirty_lock);
return ret;
@ -3470,7 +3469,7 @@ int ceph_mdsc_init(struct ceph_fs_client *fsc)
INIT_LIST_HEAD(&mdsc->snap_flush_list);
spin_lock_init(&mdsc->snap_flush_lock);
mdsc->last_cap_flush_tid = 1;
mdsc->cap_flush_tree = RB_ROOT;
INIT_LIST_HEAD(&mdsc->cap_flush_list);
INIT_LIST_HEAD(&mdsc->cap_dirty);
INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
mdsc->num_cap_flushing = 0;

2
fs/ceph/mds_client.h
View File

@ -325,7 +325,7 @@ struct ceph_mds_client {
spinlock_t snap_flush_lock;
u64 last_cap_flush_tid;
struct rb_root cap_flush_tree;
struct list_head cap_flush_list;
struct list_head cap_dirty; /* inodes with dirty caps */
struct list_head cap_dirty_migrating; /* ...that are migration... */
int num_cap_flushing; /* # caps we are flushing */

9
fs/ceph/super.h
View File

@ -189,11 +189,8 @@ static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
struct ceph_cap_flush {
u64 tid;
int caps;
struct rb_node g_node; // global
union {
struct rb_node i_node; // inode
struct list_head list;
};
struct list_head g_list; // global
struct list_head i_list; // per inode
};
/*
@ -310,7 +307,7 @@ struct ceph_inode_info {
* overlapping, pipelined cap flushes to the mds. we can probably
* reduce the tid to 8 bits if we're concerned about inode size. */
struct ceph_cap_flush *i_prealloc_cap_flush;
struct rb_root i_cap_flush_tree;
struct list_head i_cap_flush_list;
wait_queue_head_t i_cap_wq; /* threads waiting on a capability */
unsigned long i_hold_caps_min; /* jiffies */
unsigned long i_hold_caps_max; /* jiffies */