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ceph: add infrastructure for waiting for async create to complete

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When we issue an async create, we must ensure that any later on-the-wire
requests involving it wait for the create reply.

Expand i_ceph_flags to be an unsigned long, and add a new bit that
MDS requests can wait on. If the bit is set in the inode when sending
caps, then don't send it and just return that it has been delayed.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton
2020-01-14 15:06:40 -05:00
committed by Ilya Dryomov
parent f5e17aed3a
commit 891f3f5a6a
5 changed files with 42 additions and 4 deletions
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20
fs/ceph/mds_client.c
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@@ -2730,7 +2730,7 @@ static void kick_requests(struct ceph_mds_client *mdsc, int mds)
int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
struct ceph_mds_request *req)
{
int err;
int err = 0;
/* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
if (req->r_inode)
@@ -2743,6 +2743,24 @@ int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
CEPH_CAP_PIN);
if (req->r_inode) {
err = ceph_wait_on_async_create(req->r_inode);
if (err) {
dout("%s: wait for async create returned: %d\n",
__func__, err);
return err;
}
}
if (!err && req->r_old_inode) {
err = ceph_wait_on_async_create(req->r_old_inode);
if (err) {
dout("%s: wait for async create returned: %d\n",
__func__, err);
return err;
}
}
dout("submit_request on %p for inode %p\n", req, dir);
mutex_lock(&mdsc->mutex);
__register_request(mdsc, req, dir);