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authorSachin Prabhu <sprabhu@redhat.com>2015-01-15 15:22:04 +0300
committerSteve French <steve.french@primarydata.com>2015-01-20 05:20:46 +0300
commitca7df8e0bb2a5ec79691de8a1a4c0e611fe04e60 (patch)
tree5bfc8827dd3ccaeb7430b09debcb7f09def193ff /fs/cifs
parentf99dbfa4b39f90c3ba95169000cc2cdd59413f4e (diff)
downloadlinux-ca7df8e0bb2a5ec79691de8a1a4c0e611fe04e60.tar.xz
Complete oplock break jobs before closing file handle
Commit c11f1df5003d534fd067f0168bfad7befffb3b5c requires writers to wait for any pending oplock break handler to complete before proceeding to write. This is done by waiting on bit CIFS_INODE_PENDING_OPLOCK_BREAK in cifsFileInfo->flags. This bit is cleared by the oplock break handler job queued on the workqueue once it has completed handling the oplock break allowing writers to proceed with writing to the file. While testing, it was noticed that the filehandle could be closed while there is a pending oplock break which results in the oplock break handler on the cifsiod workqueue being cancelled before it has had a chance to execute and clear the CIFS_INODE_PENDING_OPLOCK_BREAK bit. Any subsequent attempt to write to this file hangs waiting for the CIFS_INODE_PENDING_OPLOCK_BREAK bit to be cleared. We fix this by ensuring that we also clear the bit CIFS_INODE_PENDING_OPLOCK_BREAK when we remove the oplock break handler from the workqueue. The bug was found by Red Hat QA while testing using ltp's fsstress command. Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Acked-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Jeff Layton <jlayton@samba.org> Cc: stable@vger.kernel.org Signed-off-by: Steve French <steve.french@primarydata.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/file.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 96b7e9b7706d..74f12877493a 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -366,6 +366,7 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
struct cifsLockInfo *li, *tmp;
struct cifs_fid fid;
struct cifs_pending_open open;
+ bool oplock_break_cancelled;
spin_lock(&cifs_file_list_lock);
if (--cifs_file->count > 0) {
@@ -397,7 +398,7 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
}
spin_unlock(&cifs_file_list_lock);
- cancel_work_sync(&cifs_file->oplock_break);
+ oplock_break_cancelled = cancel_work_sync(&cifs_file->oplock_break);
if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
struct TCP_Server_Info *server = tcon->ses->server;
@@ -409,6 +410,9 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
_free_xid(xid);
}
+ if (oplock_break_cancelled)
+ cifs_done_oplock_break(cifsi);
+
cifs_del_pending_open(&open);
/*