From 06fa229ceb36898e68022b5654c017d2c6582d7d Mon Sep 17 00:00:00 2001 From: David Howells Date: Mon, 16 Dec 2024 20:40:55 +0000 Subject: netfs: Abstract out a rolling folio buffer implementation A rolling buffer is a series of folios held in a list of folio_queues. New folios and folio_queue structs may be inserted at the head simultaneously with spent ones being removed from the tail without the need for locking. The rolling buffer includes an iov_iter and it has to be careful managing this as the list of folio_queues is extended such that an oops doesn't incurred because the iterator was pointing to the end of a folio_queue segment that got appended to and then removed. We need to use the mechanism twice, once for read and once for write, and, in future patches, we will use a second rolling buffer to handle bounce buffering for content encryption. Signed-off-by: David Howells Link: https://lore.kernel.org/r/20241216204124.3752367-6-dhowells@redhat.com cc: Jeff Layton cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner --- fs/netfs/objects.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/netfs/objects.c') diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c index 31e388ec6e48..5cdddaf1f978 100644 --- a/fs/netfs/objects.c +++ b/fs/netfs/objects.c @@ -143,7 +143,7 @@ static void netfs_free_request(struct work_struct *work) } kvfree(rreq->direct_bv); } - netfs_clear_buffer(rreq); + rolling_buffer_clear(&rreq->buffer); if (atomic_dec_and_test(&ictx->io_count)) wake_up_var(&ictx->io_count); -- cgit v1.2.3