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netfs: Fix i_dio_count leak on DIO read past i_size 

If netfs_begin_read gets a NETFS_DIO_READ request that begins
past i_size, it won't perform any i/o and just return 0.  This
will leak an increment to i_dio_count that is done at the top
of the function.

This can cause subsequent buffered read requests to block
indefinitely, waiting for a non existing dio operation to complete.

Add a inode_dio_end() for the NETFS_DIO_READ case, before returning.

Signed-off-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20240129094924.1221977-2-dhowells@redhat.com
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: Jeff Layton <jlayton@kernel.org>
cc:  <linux-afs@lists.infradead.org>
cc:  <netfs@lists.linux.dev>
cc:  <linux-fsdevel@vger.kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Marc Dionne 2024-01-29 09:49:18 +00:00 committed by Christian Brauner
parent 41bccc98fb
commit 2147caaac7
1 changed files with 2 additions and 0 deletions
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2
fs/netfs/io.c
View File

@ -748,6 +748,8 @@ int netfs_begin_read(struct netfs_io_request *rreq, bool sync)
if (!rreq->submitted) {
netfs_put_request(rreq, false, netfs_rreq_trace_put_no_submit);
if (rreq->origin == NETFS_DIO_READ)
inode_dio_end(rreq->inode);
ret = 0;
goto out;
}