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netfs: Change ->init_request() to return an error code

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Change the request initialisation function to return an error code so that
the network filesystem can return a failure (ENOMEM, for example).

This will also allow ceph to abort a ->readahead() op if the server refuses
to give it a cap allowing local caching from within the netfslib framework
(errors aren't passed back through ->readahead(), so returning, say,
-ENOBUFS will cause the op to be aborted).

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com

Link: https://lore.kernel.org/r/164678212401.1200972.16537041523832944934.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/164692905398.2099075.5238033621684646524.stgit@warthog.procyon.org.uk/ # v3
This commit is contained in:
David Howells 2022-01-20 21:55:46 +00:00
parent 663dfb65c3
commit 2de1604173
5 changed files with 41 additions and 28 deletions
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2
include/linux/netfs.h
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@ -193,7 +193,7 @@ struct netfs_io_request {
*/
struct netfs_request_ops {
bool (*is_cache_enabled)(struct inode *inode);
void (*init_request)(struct netfs_io_request *rreq, struct file *file);
int (*init_request)(struct netfs_io_request *rreq, struct file *file);
int (*begin_cache_operation)(struct netfs_io_request *rreq);
void (*expand_readahead)(struct netfs_io_request *rreq);
bool (*clamp_length)(struct netfs_io_subrequest *subreq);