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netfs: release readahead folios on iterator preparation failure

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netfs_prepare_read_iterator() batches readahead folios in put_batch so that
the folio references can be dropped after the I/O iterator has been
prepared.

If rolling_buffer_load_from_ra() fails after earlier folios have been
batched, the function returns immediately and leaves those references held.
Release the batch before returning the error.

Fixes: 06fa229ceb ("netfs: Abstract out a rolling folio buffer implementation")
Signed-off-by: Yichong Chen <chenyichong@uniontech.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://patch.msgid.link/20260727130716.1099906-4-dhowells@redhat.com
cc: Paulo Alcantara <pc@manguebit.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Yichong Chen
2026-07-27 14:07:14 +01:00
committed by Christian Brauner
parent 37a1c535c8
commit 87eb3d272d
1 changed files with 3 additions and 1 deletions
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4
fs/netfs/buffered_read.c
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@@ -102,8 +102,10 @@ static ssize_t netfs_prepare_read_iterator(struct netfs_io_subrequest *subreq,
added = rolling_buffer_load_from_ra(&rreq->buffer, ractl,
&put_batch);
if (added < 0)
if (added < 0) {
folio_batch_release(&put_batch);
return added;
}
rreq->submitted += added;
}
folio_batch_release(&put_batch);