ceph: don't pre-allocate space for cap release messages
Previously we pre-allocate cap release messages for each caps. This
wastes lots of memory when there are large amount of caps. This patch
make the code not pre-allocate the cap release messages. Instead,
we add the corresponding ceph_cap struct to a list when releasing a
cap. Later when flush cap releases is needed, we allocate the cap
release messages dynamically.
Signed-off-by: Yan, Zheng <zyan@redhat.com>
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 4ef1ae9..c496135 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -122,11 +122,21 @@
struct rb_node ci_node; /* per-ci cap tree */
struct ceph_mds_session *session;
struct list_head session_caps; /* per-session caplist */
- int mds;
u64 cap_id; /* unique cap id (mds provided) */
- int issued; /* latest, from the mds */
- int implemented; /* implemented superset of issued (for revocation) */
- int mds_wanted;
+ union {
+ /* in-use caps */
+ struct {
+ int issued; /* latest, from the mds */
+ int implemented; /* implemented superset of
+ issued (for revocation) */
+ int mds, mds_wanted;
+ };
+ /* caps to release */
+ struct {
+ u64 cap_ino;
+ int queue_release;
+ };
+ };
u32 seq, issue_seq, mseq;
u32 cap_gen; /* active/stale cycle */
unsigned long last_used;
@@ -845,8 +855,6 @@
struct ceph_cap *cap);
extern int ceph_is_any_caps(struct inode *inode);
-extern void __queue_cap_release(struct ceph_mds_session *session, u64 ino,
- u64 cap_id, u32 migrate_seq, u32 issue_seq);
extern void ceph_queue_caps_release(struct inode *inode);
extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
extern int ceph_fsync(struct file *file, loff_t start, loff_t end,