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file-posix: check the use_lock before setting the file lock 

The scenario is that when accessing a volume on an NFS filesystem
without supporting the file lock,  Qemu will complain "Failed to lock
byte 100", even when setting the file.locking = off.

We should do file lock related operations only when the file.locking is
enabled, otherwise, the syscall of 'fcntl' will return non-zero.

Signed-off-by: Li Feng <fengli@smartx.com>
Message-Id: <1607341446-85506-1-git-send-email-fengli@smartx.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Li Feng 2020-12-07 19:44:06 +08:00 committed by Kevin Wolf
parent e6c7964769
commit eb43ea16dc
1 changed files with 1 additions and 1 deletions
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2
block/file-posix.c
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@ -3104,7 +3104,7 @@ static int raw_check_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared,
}
/* Copy locks to the new fd */
if (s->perm_change_fd) {
if (s->perm_change_fd && s->use_lock) {
ret = raw_apply_lock_bytes(NULL, s->perm_change_fd, perm, ~shared,
false, errp);
if (ret < 0) {