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Message-Id: <1424177190-14252-2-git-send-email-jeff.layton@primarydata.com>
Date: Tue, 17 Feb 2015 07:46:27 -0500
From: Jeff Layton <jeff.layton@...marydata.com>
To: linux-fsdevel@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
"Kirill A. Shutemov" <kirill@...temov.name>,
"J. Bruce Fields" <bfields@...ldses.org>,
Christoph Hellwig <hch@....de>,
Dave Chinner <david@...morbit.com>,
Sasha Levin <sasha.levin@...cle.com>
Subject: [PATCH 1/4] Revert "locks: keep a count of locks on the flctx lists"
This reverts commit 9bd0f45b7037fcfa8b575c7e27d0431d6e6dc3bb.
Linus rightly pointed out that I failed to initialize the counters
when adding them, so they don't work as expected. Just revert this
patch for now.
Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Jeff Layton <jeff.layton@...marydata.com>
---
fs/ceph/locks.c | 11 +++++++++--
fs/cifs/file.c | 14 ++++++++++----
fs/locks.c | 45 ++++++++++++++++-----------------------------
include/linux/fs.h | 3 ---
4 files changed, 35 insertions(+), 38 deletions(-)
diff --git a/fs/ceph/locks.c b/fs/ceph/locks.c
index 06ea5cd05cd9..0303da8e3233 100644
--- a/fs/ceph/locks.c
+++ b/fs/ceph/locks.c
@@ -242,9 +242,12 @@ int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
/*
* Fills in the passed counter variables, so you can prepare pagelist metadata
* before calling ceph_encode_locks.
+ *
+ * FIXME: add counters to struct file_lock_context so we don't need to do this?
*/
void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
{
+ struct file_lock *lock;
struct file_lock_context *ctx;
*fcntl_count = 0;
@@ -252,8 +255,12 @@ void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
ctx = inode->i_flctx;
if (ctx) {
- *fcntl_count = ctx->flc_posix_cnt;
- *flock_count = ctx->flc_flock_cnt;
+ spin_lock(&ctx->flc_lock);
+ list_for_each_entry(lock, &ctx->flc_posix, fl_list)
+ ++(*fcntl_count);
+ list_for_each_entry(lock, &ctx->flc_flock, fl_list)
+ ++(*flock_count);
+ spin_unlock(&ctx->flc_lock);
}
dout("counted %d flock locks and %d fcntl locks",
*flock_count, *fcntl_count);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 8fe1f7a21b3e..a94b3e673182 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1129,7 +1129,7 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
struct file_lock *flock;
struct file_lock_context *flctx = inode->i_flctx;
- unsigned int i;
+ unsigned int count = 0, i;
int rc = 0, xid, type;
struct list_head locks_to_send, *el;
struct lock_to_push *lck, *tmp;
@@ -1140,14 +1140,20 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
if (!flctx)
goto out;
+ spin_lock(&flctx->flc_lock);
+ list_for_each(el, &flctx->flc_posix) {
+ count++;
+ }
+ spin_unlock(&flctx->flc_lock);
+
INIT_LIST_HEAD(&locks_to_send);
/*
- * Allocating flc_posix_cnt locks is enough because no FL_POSIX locks
- * can be added to the list while we are holding cinode->lock_sem that
+ * Allocating count locks is enough because no FL_POSIX locks can be
+ * added to the list while we are holding cinode->lock_sem that
* protects locking operations of this inode.
*/
- for (i = 0; i < flctx->flc_posix_cnt; i++) {
+ for (i = 0; i < count; i++) {
lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL);
if (!lck) {
rc = -ENOMEM;
diff --git a/fs/locks.c b/fs/locks.c
index 4753218f308e..7998f670812c 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -681,21 +681,18 @@ static void locks_wake_up_blocks(struct file_lock *blocker)
}
static void
-locks_insert_lock_ctx(struct file_lock *fl, int *counter,
- struct list_head *before)
+locks_insert_lock_ctx(struct file_lock *fl, 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, int *counter)
+locks_unlink_lock_ctx(struct file_lock *fl)
{
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;
@@ -704,10 +701,9 @@ locks_unlink_lock_ctx(struct file_lock *fl, int *counter)
}
static void
-locks_delete_lock_ctx(struct file_lock *fl, int *counter,
- struct list_head *dispose)
+locks_delete_lock_ctx(struct file_lock *fl, struct list_head *dispose)
{
- locks_unlink_lock_ctx(fl, counter);
+ locks_unlink_lock_ctx(fl);
if (dispose)
list_add(&fl->fl_list, dispose);
else
@@ -895,7 +891,7 @@ 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, &ctx->flc_flock_cnt, &dispose);
+ locks_delete_lock_ctx(fl, &dispose);
break;
}
@@ -929,7 +925,7 @@ 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_cnt, &ctx->flc_flock);
+ locks_insert_lock_ctx(new_fl, &ctx->flc_flock);
new_fl = NULL;
error = 0;
@@ -1046,8 +1042,7 @@ 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, &ctx->flc_posix_cnt,
- &dispose);
+ locks_delete_lock_ctx(fl, &dispose);
continue;
}
request = fl;
@@ -1076,8 +1071,7 @@ 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,
- &ctx->flc_posix_cnt, &dispose);
+ locks_delete_lock_ctx(fl, &dispose);
continue;
}
/*
@@ -1093,10 +1087,8 @@ 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,
- &ctx->flc_posix_cnt, &fl->fl_list);
- locks_delete_lock_ctx(fl,
- &ctx->flc_posix_cnt, &dispose);
+ locks_insert_lock_ctx(request, &fl->fl_list);
+ locks_delete_lock_ctx(fl, &dispose);
added = true;
}
}
@@ -1124,8 +1116,7 @@ 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, &ctx->flc_posix_cnt,
- &fl->fl_list);
+ locks_insert_lock_ctx(new_fl, &fl->fl_list);
new_fl = NULL;
}
if (right) {
@@ -1136,8 +1127,7 @@ 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, &ctx->flc_posix_cnt,
- &fl->fl_list);
+ locks_insert_lock_ctx(left, &fl->fl_list);
}
right->fl_start = request->fl_end + 1;
locks_wake_up_blocks(right);
@@ -1321,7 +1311,6 @@ 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)
@@ -1331,7 +1320,6 @@ 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);
@@ -1339,7 +1327,7 @@ 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, &flctx->flc_lease_cnt, dispose);
+ locks_delete_lock_ctx(fl, dispose);
}
return 0;
}
@@ -1456,8 +1444,7 @@ 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, &ctx->flc_lease_cnt,
- &dispose);
+ locks_delete_lock_ctx(fl, &dispose);
}
if (list_empty(&ctx->flc_lease))
@@ -1697,7 +1684,7 @@ 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_cnt, &ctx->flc_lease);
+ locks_insert_lock_ctx(lease, &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
@@ -1710,7 +1697,7 @@ generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **pr
smp_mb();
error = check_conflicting_open(dentry, arg, lease->fl_flags);
if (error) {
- locks_unlink_lock_ctx(lease, &ctx->flc_lease_cnt);
+ locks_unlink_lock_ctx(lease);
goto out;
}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e49f10cc8a73..a5a303e8a33c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -969,9 +969,6 @@ struct file_lock_context {
struct list_head flc_flock;
struct list_head flc_posix;
struct list_head flc_lease;
- int flc_flock_cnt;
- int flc_posix_cnt;
- int flc_lease_cnt;
};
/* The following constant reflects the upper bound of the file/locking space */
--
2.1.0
--
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