diff options
| author | Pavel Shilovsky <piastry@etersoft.ru> | 2012-11-22 17:10:57 +0400 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2012-12-05 13:27:29 -0600 |
| commit | f152fd5fffa78910c467b17f12d0aa060aa408a6 (patch) | |
| tree | 156a6466d1cc3b79a82d7520615d9be0feb71d13 | |
| parent | b8db928b765b4b0fe1aec3eb7f1741fedbed9a33 (diff) | |
CIFS: Implement cifs_relock_file
that reacquires byte-range locks when a file is reopened.
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>
| -rw-r--r-- | fs/cifs/file.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 1747cbff7dd..67fe0b811f2 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -505,16 +505,36 @@ out: return rc; } +static int cifs_push_posix_locks(struct cifsFileInfo *cfile); + /* * Try to reacquire byte range locks that were released when session - * to server was lost + * to server was lost. */ -static int cifs_relock_file(struct cifsFileInfo *cifsFile) +static int +cifs_relock_file(struct cifsFileInfo *cfile) { + struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); + struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); + struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); int rc = 0; - /* BB list all locks open on this file and relock */ + /* we are going to update can_cache_brlcks here - need a write access */ + down_write(&cinode->lock_sem); + if (cinode->can_cache_brlcks) { + /* can cache locks - no need to push them */ + up_write(&cinode->lock_sem); + return rc; + } + + if (cap_unix(tcon->ses) && + (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && + ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) + rc = cifs_push_posix_locks(cfile); + else + rc = tcon->ses->server->ops->push_mand_locks(cfile); + up_write(&cinode->lock_sem); return rc; } |