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netfs: Provide an iterator-reset function

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Provide a function to reset the iterator on a subrequest.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Link: https://lore.kernel.org/r/20240814203850.2240469-17-dhowells@redhat.com/ # v2
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Howells
2024-07-08 14:49:45 +01:00
committed by Christian Brauner
parent cd0277ed0c
commit bfaa33b8ba
4 changed files with 23 additions and 8 deletions
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18
fs/netfs/misc.c
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@@ -84,6 +84,24 @@ void netfs_clear_buffer(struct netfs_io_request *rreq)
}
}
/*
* Reset the subrequest iterator to refer just to the region remaining to be
* read. The iterator may or may not have been advanced by socket ops or
* extraction ops to an extent that may or may not match the amount actually
* read.
*/
void netfs_reset_iter(struct netfs_io_subrequest *subreq)
{
struct iov_iter *io_iter = &subreq->io_iter;
size_t remain = subreq->len - subreq->transferred;
if (io_iter->count > remain)
iov_iter_advance(io_iter, io_iter->count - remain);
else if (io_iter->count < remain)
iov_iter_revert(io_iter, remain - io_iter->count);
iov_iter_truncate(&subreq->io_iter, remain);
}
/**
* netfs_dirty_folio - Mark folio dirty and pin a cache object for writeback
* @mapping: The mapping the folio belongs to.