fuse: use exclusive lock when FUSE_I_CACHE_IO_MODE is set

This may be a typo. The comment has said shared locks are not allowed when this bit is set. If using shared lock, the wait in `fuse_file_cached_io_open` may be forever. Fixes: 205c1d8 ("fuse: allow parallel dio writes with FUSE_DIRECT_IO_ALLOW_MMAP") CC: [email protected] # v6.9 Signed-off-by: yangyun <[email protected]> Reviewed-by: Bernd Schubert <[email protected]> Signed-off-by: Miklos Szeredi <[email protected]> (cherry picked from commit 2f3d8ff)
DDNStorage · bsbernd · Jun 25, 2025 · Jan 20, 2025 · Jan 20, 2025 · Jan 20, 2025
commit bbddfd7faae92f6a98068175dc3a9becf416f070
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
@@ -1351,7 +1351,7 @@ static bool fuse_dio_wr_exclusive_lock(struct kiocb *iocb, struct iov_iter *from
 
 	/* shared locks are not allowed with parallel page cache IO */
 	if (test_bit(FUSE_I_CACHE_IO_MODE, &fi->state))
-		return false;
+		return true;
 
 	/* Parallel dio beyond EOF is not supported, at least for now. */
 	if (fuse_io_past_eof(iocb, from))