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ceph: use cap_wait_list only if debugfs is enabled

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Only debugfs uses this list.  By omitting it, we save some memory and
reduce lock contention on `caps_list_lock`.

Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Max Kellermann 2024-06-06 18:41:57 +02:00 committed by Ilya Dryomov
parent 0c38364824
commit 65d284a38c
3 changed files with 14 additions and 0 deletions
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6
fs/ceph/caps.c
View File

@ -3067,10 +3067,13 @@ int __ceph_get_caps(struct inode *inode, struct ceph_file_info *fi, int need,
flags, &_got);
WARN_ON_ONCE(ret == -EAGAIN);
if (!ret) {
#ifdef CONFIG_DEBUG_FS
struct ceph_mds_client *mdsc = fsc->mdsc;
struct cap_wait cw;
#endif
DEFINE_WAIT_FUNC(wait, woken_wake_function);
#ifdef CONFIG_DEBUG_FS
cw.ino = ceph_ino(inode);
cw.tgid = current->tgid;
cw.need = need;
@ -3079,6 +3082,7 @@ int __ceph_get_caps(struct inode *inode, struct ceph_file_info *fi, int need,
spin_lock(&mdsc->caps_list_lock);
list_add(&cw.list, &mdsc->cap_wait_list);
spin_unlock(&mdsc->caps_list_lock);
#endif
/* make sure used fmode not timeout */
ceph_get_fmode(ci, flags, FMODE_WAIT_BIAS);
@ -3097,9 +3101,11 @@ int __ceph_get_caps(struct inode *inode, struct ceph_file_info *fi, int need,
remove_wait_queue(&ci->i_cap_wq, &wait);
ceph_put_fmode(ci, flags, FMODE_WAIT_BIAS);
#ifdef CONFIG_DEBUG_FS
spin_lock(&mdsc->caps_list_lock);
list_del(&cw.list);
spin_unlock(&mdsc->caps_list_lock);
#endif
if (ret == -EAGAIN)
continue;

2
fs/ceph/mds_client.c
View File

@ -5505,7 +5505,9 @@ int ceph_mdsc_init(struct ceph_fs_client *fsc)
INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
mdsc->last_renew_caps = jiffies;
INIT_LIST_HEAD(&mdsc->cap_delay_list);
#ifdef CONFIG_DEBUG_FS
INIT_LIST_HEAD(&mdsc->cap_wait_list);
#endif
spin_lock_init(&mdsc->cap_delay_lock);
INIT_LIST_HEAD(&mdsc->cap_unlink_delay_list);
INIT_LIST_HEAD(&mdsc->snap_flush_list);

6
fs/ceph/mds_client.h
View File

@ -416,6 +416,8 @@ struct ceph_quotarealm_inode {
struct inode *inode;
};
#ifdef CONFIG_DEBUG_FS
struct cap_wait {
struct list_head list;
u64 ino;
@ -424,6 +426,8 @@ struct cap_wait {
int want;
};
#endif
enum {
CEPH_MDSC_STOPPING_BEGIN = 1,
CEPH_MDSC_STOPPING_FLUSHING = 2,
@ -512,7 +516,9 @@ struct ceph_mds_client {
spinlock_t caps_list_lock;
struct list_head caps_list; /* unused (reserved or
unreserved) */
#ifdef CONFIG_DEBUG_FS
struct list_head cap_wait_list;
#endif
int caps_total_count; /* total caps allocated */
int caps_use_count; /* in use */
int caps_use_max; /* max used caps */