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splice: Check for zero count in vfs_splice_read()

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Make vfs_splice_read() return immediately if the length is 0.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christian Brauner <brauner@kernel.org>
cc: Jens Axboe <axboe@kernel.dk>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: linux-block@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
Link: https://lore.kernel.org/r/20230522135018.2742245-7-dhowells@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
David Howells 2023-05-22 14:49:53 +01:00 committed by Jens Axboe
parent 6a3f30b8bd
commit 123856f0e8
1 changed files with 2 additions and 0 deletions
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2
fs/splice.c
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@ -891,6 +891,8 @@ long vfs_splice_read(struct file *in, loff_t *ppos,
if (unlikely(!(in->f_mode & FMODE_READ)))
return -EBADF;
if (!len)
return 0;
/* Don't try to read more the pipe has space for. */
p_space = pipe->max_usage - pipe_occupancy(pipe->head, pipe->tail);