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authorJeff Layton <jlayton@redhat.com>2013-06-21 08:58:15 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-06-29 12:57:42 +0400
commit1c8c601a8c0dc59fe64907dcd9d512a3d181ddc7 (patch)
tree1a9c91de460a7c2f9fd6ad77060be484456e49b9 /fs/afs
parent889746917193ab3007a779d65231510715b20fb6 (diff)
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locks: protect most of the file_lock handling with i_lock
Having a global lock that protects all of this code is a clear scalability problem. Instead of doing that, move most of the code to be protected by the i_lock instead. The exceptions are the global lists that the ->fl_link sits on, and the ->fl_block list. ->fl_link is what connects these structures to the global lists, so we must ensure that we hold those locks when iterating over or updating these lists. Furthermore, sound deadlock detection requires that we hold the blocked_list state steady while checking for loops. We also must ensure that the search and update to the list are atomic. For the checking and insertion side of the blocked_list, push the acquisition of the global lock into __posix_lock_file and ensure that checking and update of the blocked_list is done without dropping the lock in between. On the removal side, when waking up blocked lock waiters, take the global lock before walking the blocked list and dequeue the waiters from the global list prior to removal from the fl_block list. With this, deadlock detection should be race free while we minimize excessive file_lock_lock thrashing. Finally, in order to avoid a lock inversion problem when handling /proc/locks output we must ensure that manipulations of the fl_block list are also protected by the file_lock_lock. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/afs')
-rw-r--r--fs/afs/flock.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/afs/flock.c b/fs/afs/flock.c
index 2497bf306c70..a8cf2cff836c 100644
--- a/fs/afs/flock.c
+++ b/fs/afs/flock.c
@@ -252,7 +252,8 @@ static void afs_defer_unlock(struct afs_vnode *vnode, struct key *key)
*/
static int afs_do_setlk(struct file *file, struct file_lock *fl)
{
- struct afs_vnode *vnode = AFS_FS_I(file->f_mapping->host);
+ struct inode *inode = file_inode(file);
+ struct afs_vnode *vnode = AFS_FS_I(inode);
afs_lock_type_t type;
struct key *key = file->private_data;
int ret;
@@ -273,7 +274,7 @@ static int afs_do_setlk(struct file *file, struct file_lock *fl)
type = (fl->fl_type == F_RDLCK) ? AFS_LOCK_READ : AFS_LOCK_WRITE;
- lock_flocks();
+ spin_lock(&inode->i_lock);
/* make sure we've got a callback on this file and that our view of the
* data version is up to date */
@@ -420,7 +421,7 @@ given_lock:
afs_vnode_fetch_status(vnode, NULL, key);
error:
- unlock_flocks();
+ spin_unlock(&inode->i_lock);
_leave(" = %d", ret);
return ret;