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netfs: Fix read-retry for fs with no ->prepare_read()

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Fix netfslib's read-retry to only call ->prepare_read() in the backing
filesystem such a function is provided.  We can get to this point if a
there's an active cache as failed reads from the cache need negotiating
with the server instead.

Fixes: ee4cdf7ba8 ("netfs: Speed up buffered reading")
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/529329.1736261010@warthog.procyon.org.uk
cc: Jeff Layton <jlayton@kernel.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:
David Howells
2025-01-07 14:43:30 +00:00
committed by Christian Brauner
parent 3f6bc9e3ab
commit 904abff4b1
1 changed files with 2 additions and 1 deletions
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3
fs/netfs/read_retry.c
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@@ -152,7 +152,8 @@ static void netfs_retry_read_subrequests(struct netfs_io_request *rreq)
BUG_ON(!len);
/* Renegotiate max_len (rsize) */
if (rreq->netfs_ops->prepare_read(subreq) < 0) {
if (rreq->netfs_ops->prepare_read &&
rreq->netfs_ops->prepare_read(subreq) < 0) {
trace_netfs_sreq(subreq, netfs_sreq_trace_reprep_failed);
__set_bit(NETFS_SREQ_FAILED, &subreq->flags);
}