xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

locks: keep a count of locks on the flctx lists

Browse Source 
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>
This commit is contained in:
Jeff Layton
2015-01-16 15:05:57 -05:00
committed by Jeff Layton
parent 7448cc37b1
commit 9bd0f45b70
4 changed files with 38 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
fs/locks.c
View File

@@ -681,18 +681,21 @@ static void locks_wake_up_blocks(struct file_lock *blocker)
}
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 @@ locks_unlink_lock_ctx(struct file_lock *fl)
}
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 @@ static int flock_lock_file(struct file *filp, struct file_lock *request)
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 @@ find_conflict:
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 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
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 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
* 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 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
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 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
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 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
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 @@ static void lease_clear_pending(struct file_lock *fl, int arg)
/* 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 @@ int lease_modify(struct file_lock *fl, int arg, struct list_head *dispose)
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 @@ int lease_modify(struct file_lock *fl, int arg, struct list_head *dispose)
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 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
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 @@ generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **pr
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 @@ generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **pr
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;
}