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authorPavel Shilovsky <piastry@etersoft.ru>2012-11-22 17:10:57 +0400
committerSteve French <smfrench@gmail.com>2012-12-05 13:27:29 -0600
commitf152fd5fffa78910c467b17f12d0aa060aa408a6 (patch)
tree156a6466d1cc3b79a82d7520615d9be0feb71d13 /fs/cifs
parentb8db928b765b4b0fe1aec3eb7f1741fedbed9a33 (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>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/file.c26
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;
}