locks: keep a count of locks on the flctx lists
This makes things a bit more efficient in the cifs and ceph lock
pushing code.
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Acked-by: Christoph Hellwig <hch@lst.de>
diff --git a/fs/locks.c b/fs/locks.c
index 864f246..bd57870 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -681,18 +681,21 @@
}
static void
-locks_insert_lock_ctx(struct file_lock *fl, struct list_head *before)
+locks_insert_lock_ctx(struct file_lock *fl, int *counter,
+ struct list_head *before)
{
fl->fl_nspid = get_pid(task_tgid(current));
list_add_tail(&fl->fl_list, before);
+ ++*counter;
locks_insert_global_locks(fl);
}
static void
-locks_unlink_lock_ctx(struct file_lock *fl)
+locks_unlink_lock_ctx(struct file_lock *fl, int *counter)
{
locks_delete_global_locks(fl);
list_del_init(&fl->fl_list);
+ --*counter;
if (fl->fl_nspid) {
put_pid(fl->fl_nspid);
fl->fl_nspid = NULL;
@@ -701,9 +704,10 @@
}
static void
-locks_delete_lock_ctx(struct file_lock *fl, struct list_head *dispose)
+locks_delete_lock_ctx(struct file_lock *fl, int *counter,
+ struct list_head *dispose)
{
- locks_unlink_lock_ctx(fl);
+ locks_unlink_lock_ctx(fl, counter);
if (dispose)
list_add(&fl->fl_list, dispose);
else
@@ -891,7 +895,7 @@
if (request->fl_type == fl->fl_type)
goto out;
found = true;
- locks_delete_lock_ctx(fl, &dispose);
+ locks_delete_lock_ctx(fl, &ctx->flc_flock_cnt, &dispose);
break;
}
@@ -925,7 +929,7 @@
if (request->fl_flags & FL_ACCESS)
goto out;
locks_copy_lock(new_fl, request);
- locks_insert_lock_ctx(new_fl, &ctx->flc_flock);
+ locks_insert_lock_ctx(new_fl, &ctx->flc_flock_cnt, &ctx->flc_flock);
new_fl = NULL;
error = 0;
@@ -1042,7 +1046,8 @@
else
request->fl_end = fl->fl_end;
if (added) {
- locks_delete_lock_ctx(fl, &dispose);
+ locks_delete_lock_ctx(fl, &ctx->flc_posix_cnt,
+ &dispose);
continue;
}
request = fl;
@@ -1071,7 +1076,8 @@
* one (This may happen several times).
*/
if (added) {
- locks_delete_lock_ctx(fl, &dispose);
+ locks_delete_lock_ctx(fl,
+ &ctx->flc_posix_cnt, &dispose);
continue;
}
/*
@@ -1087,8 +1093,10 @@
locks_copy_lock(new_fl, request);
request = new_fl;
new_fl = NULL;
- locks_insert_lock_ctx(request, &fl->fl_list);
- locks_delete_lock_ctx(fl, &dispose);
+ locks_insert_lock_ctx(request,
+ &ctx->flc_posix_cnt, &fl->fl_list);
+ locks_delete_lock_ctx(fl,
+ &ctx->flc_posix_cnt, &dispose);
added = true;
}
}
@@ -1116,7 +1124,8 @@
goto out;
}
locks_copy_lock(new_fl, request);
- locks_insert_lock_ctx(new_fl, &fl->fl_list);
+ locks_insert_lock_ctx(new_fl, &ctx->flc_posix_cnt,
+ &fl->fl_list);
new_fl = NULL;
}
if (right) {
@@ -1127,7 +1136,8 @@
left = new_fl2;
new_fl2 = NULL;
locks_copy_lock(left, right);
- locks_insert_lock_ctx(left, &fl->fl_list);
+ locks_insert_lock_ctx(left, &ctx->flc_posix_cnt,
+ &fl->fl_list);
}
right->fl_start = request->fl_end + 1;
locks_wake_up_blocks(right);
@@ -1311,6 +1321,7 @@
/* We already had a lease on this file; just change its type */
int lease_modify(struct file_lock *fl, int arg, struct list_head *dispose)
{
+ struct file_lock_context *flctx;
int error = assign_type(fl, arg);
if (error)
@@ -1320,6 +1331,7 @@
if (arg == F_UNLCK) {
struct file *filp = fl->fl_file;
+ flctx = file_inode(filp)->i_flctx;
f_delown(filp);
filp->f_owner.signum = 0;
fasync_helper(0, fl->fl_file, 0, &fl->fl_fasync);
@@ -1327,7 +1339,7 @@
printk(KERN_ERR "locks_delete_lock: fasync == %p\n", fl->fl_fasync);
fl->fl_fasync = NULL;
}
- locks_delete_lock_ctx(fl, dispose);
+ locks_delete_lock_ctx(fl, &flctx->flc_lease_cnt, dispose);
}
return 0;
}
@@ -1442,7 +1454,8 @@
fl->fl_downgrade_time = break_time;
}
if (fl->fl_lmops->lm_break(fl))
- locks_delete_lock_ctx(fl, &dispose);
+ locks_delete_lock_ctx(fl, &ctx->flc_lease_cnt,
+ &dispose);
}
if (list_empty(&ctx->flc_lease))
@@ -1678,7 +1691,7 @@
if (!leases_enable)
goto out;
- locks_insert_lock_ctx(lease, &ctx->flc_lease);
+ locks_insert_lock_ctx(lease, &ctx->flc_lease_cnt, &ctx->flc_lease);
/*
* The check in break_lease() is lockless. It's possible for another
* open to race in after we did the earlier check for a conflicting
@@ -1691,7 +1704,7 @@
smp_mb();
error = check_conflicting_open(dentry, arg);
if (error) {
- locks_unlink_lock_ctx(lease);
+ locks_unlink_lock_ctx(lease, &ctx->flc_lease_cnt);
goto out;
}