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ceph: check if file lock exists before sending unlock request

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When a process exits, kernel closes its files. locks_remove_file()
is called to remove file locks on these files. locks_remove_file()
tries unlocking files even there is no file lock.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng 2020-02-11 22:54:43 +08:00 committed by Ilya Dryomov
parent cb63483ad0
commit bbb480ab05
1 changed files with 29 additions and 2 deletions
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31
fs/ceph/locks.c
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@ -210,6 +210,21 @@ static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc,
return 0;
}
static int try_unlock_file(struct file *file, struct file_lock *fl)
{
int err;
unsigned int orig_flags = fl->fl_flags;
fl->fl_flags |= FL_EXISTS;
err = locks_lock_file_wait(file, fl);
fl->fl_flags = orig_flags;
if (err == -ENOENT) {
if (!(orig_flags & FL_EXISTS))
err = 0;
return err;
}
return 1;
}
/**
* Attempt to set an fcntl lock.
* For now, this just goes away to the server. Later it may be more awesome.
@ -255,9 +270,15 @@ int ceph_lock(struct file *file, int cmd, struct file_lock *fl)
else
lock_cmd = CEPH_LOCK_UNLOCK;
if (op == CEPH_MDS_OP_SETFILELOCK && F_UNLCK == fl->fl_type) {
err = try_unlock_file(file, fl);
if (err <= 0)
return err;
}
err = ceph_lock_message(CEPH_LOCK_FCNTL, op, inode, lock_cmd, wait, fl);
if (!err) {
if (op == CEPH_MDS_OP_SETFILELOCK) {
if (op == CEPH_MDS_OP_SETFILELOCK && F_UNLCK != fl->fl_type) {
dout("mds locked, locking locally\n");
err = posix_lock_file(file, fl, NULL);
if (err) {
@ -311,9 +332,15 @@ int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
else
lock_cmd = CEPH_LOCK_UNLOCK;
if (F_UNLCK == fl->fl_type) {
err = try_unlock_file(file, fl);
if (err <= 0)
return err;
}
err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK,
inode, lock_cmd, wait, fl);
if (!err) {
if (!err && F_UNLCK != fl->fl_type) {
err = locks_lock_file_wait(file, fl);
if (err) {
ceph_lock_message(CEPH_LOCK_FLOCK,