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netfs: Make ops->init_rreq() optional

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Make the ops->init_rreq() callback optional.  This isn't required for the
erofs changes I'm implementing to do on-demand read through fscache[1].
Further, ceph has an empty init_rreq method that can then be removed and
it's marked optional in the documentation.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
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/20211227125444.21187-1-jefflexu@linux.alibaba.com/ [1]
Link: https://lore.kernel.org/r/20211228124419.103020-1-jefflexu@linux.alibaba.com
Link: https://lore.kernel.org/r/164251410387.3435901.2504600788262093313.stgit@warthog.procyon.org.uk/ # v1
This commit is contained in:
Jeffle Xu 2021-12-28 20:44:19 +08:00 committed by David Howells
parent c522e3ad29
commit cef0223191
2 changed files with 2 additions and 6 deletions
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5
fs/ceph/addr.c
View File

@ -297,10 +297,6 @@ out:
dout("%s: result %d\n", __func__, err);
}
static void ceph_init_rreq(struct netfs_read_request *rreq, struct file *file)
{
}
static void ceph_readahead_cleanup(struct address_space *mapping, void *priv)
{
struct inode *inode = mapping->host;
@ -312,7 +308,6 @@ static void ceph_readahead_cleanup(struct address_space *mapping, void *priv)
}
static const struct netfs_read_request_ops ceph_netfs_read_ops = {
.init_rreq = ceph_init_rreq,
.is_cache_enabled = ceph_is_cache_enabled,
.begin_cache_operation = ceph_begin_cache_operation,
.issue_op = ceph_netfs_issue_op,

3
fs/netfs/read_helper.c
View File

@ -55,7 +55,8 @@ static struct netfs_read_request *netfs_alloc_read_request(
INIT_WORK(&rreq->work, netfs_rreq_work);
refcount_set(&rreq->usage, 1);
__set_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
ops->init_rreq(rreq, file);
if (ops->init_rreq)
ops->init_rreq(rreq, file);
netfs_stat(&netfs_n_rh_rreq);
}