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netfs: Pass a flag to ->prepare_write() to say if there's no alloc'd space

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Pass a flag to ->prepare_write() to indicate if there's definitely no
space allocated in the cache yet (for instance if we've already checked as
we were asked to do a read).

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/163819583123.215744.12783808230464471417.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906886835.143852.6689886781122679769.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967079100.1823006.12889542712309574359.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021489334.640689.3131206613015409076.stgit@warthog.procyon.org.uk/ # v4
This commit is contained in:
David Howells 2021-10-20 14:30:37 +01:00
parent 9e1aa6b8f4
commit a39c41b853
2 changed files with 3 additions and 2 deletions
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2
fs/netfs/read_helper.c
View File

@ -323,7 +323,7 @@ static void netfs_rreq_do_write_to_cache(struct netfs_read_request *rreq)
}
ret = cres->ops->prepare_write(cres, &subreq->start, &subreq->len,
rreq->i_size);
rreq->i_size, true);
if (ret < 0) {
trace_netfs_failure(rreq, subreq, ret, netfs_fail_prepare_write);
trace_netfs_sreq(subreq, netfs_sreq_trace_write_skip);

3
include/linux/netfs.h
View File

@ -232,7 +232,8 @@ struct netfs_cache_ops {
* actually do.
*/
int (*prepare_write)(struct netfs_cache_resources *cres,
loff_t *_start, size_t *_len, loff_t i_size);
loff_t *_start, size_t *_len, loff_t i_size,
bool no_space_allocated_yet);
};
struct readahead_control;