diff options
| author | David Howells <dhowells@redhat.com> | 2024-07-08 14:49:45 +0100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-09-12 12:20:40 +0200 |
| commit | bfaa33b8ba196f9506a45e5a36e968f087c8cd16 (patch) | |
| tree | 36699fc2f9a50097000ca6e01734e9105cbf4a05 /fs/netfs/misc.c | |
| parent | cd0277ed0c188dd40e7744e89299af7b78831ca4 (diff) | |
netfs: Provide an iterator-reset function
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>
Diffstat (limited to 'fs/netfs/misc.c')
| -rw-r--r-- | fs/netfs/misc.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/netfs/misc.c b/fs/netfs/misc.c index 4cd2f84415c1..0ad0982ce0e2 100644 --- a/fs/netfs/misc.c +++ b/fs/netfs/misc.c @@ -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. |