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Commit f152fd5f authored by Pavel Shilovsky's avatar Pavel Shilovsky Committed by Steve French
Browse files

CIFS: Implement cifs_relock_file 



that reacquires byte-range locks when a file is reopened.

Reviewed-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarPavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
parent b8db928b

fs/cifs/file.c

+23 −3
Original line number Diff line number Diff line
@@ -505,16 +505,36 @@ int cifs_open(struct inode *inode, struct file *file) 
	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;

}