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ceph: cap tracking for async directory operations 

Track and correctly handle directory caps for asynchronous operations.
Add aliases for Frc caps that we now designate at Dcu caps (when dealing
with directories).

Unlike file caps, we don't reclaim these when the session goes away, and
instead preemptively release them. In-flight async dirops are instead
handled during reconnect phase. The client needs to re-do a synchronous
operation in order to re-get directory caps.

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 2020-02-18 14:12:45 -05:00 committed by Ilya Dryomov
parent 40dcf75e82
commit a25949b990
4 changed files with 56 additions and 14 deletions
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27
fs/ceph/caps.c
View File

@ -992,7 +992,11 @@ int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
int __ceph_caps_wanted(struct ceph_inode_info *ci)
{
int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
if (!S_ISDIR(ci->vfs_inode.i_mode)) {
if (S_ISDIR(ci->vfs_inode.i_mode)) {
/* we want EXCL if holding caps of dir ops */
if (w & CEPH_CAP_ANY_DIR_OPS)
w |= CEPH_CAP_FILE_EXCL;
} else {
/* we want EXCL if dirty data */
if (w & CEPH_CAP_FILE_BUFFER)
w |= CEPH_CAP_FILE_EXCL;
@ -1893,10 +1897,13 @@ retry_locked:
* revoking the shared cap on every create/unlink
* operation.
*/
if (IS_RDONLY(inode))
if (IS_RDONLY(inode)) {
want = CEPH_CAP_ANY_SHARED;
else
want = CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
} else {
want = CEPH_CAP_ANY_SHARED |
CEPH_CAP_FILE_EXCL |
CEPH_CAP_ANY_DIR_OPS;
}
retain |= want;
} else {
@ -2749,10 +2756,14 @@ int ceph_try_get_caps(struct inode *inode, int need, int want,
int ret;
BUG_ON(need & ~CEPH_CAP_FILE_RD);
BUG_ON(want & ~(CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO|CEPH_CAP_FILE_SHARED));
ret = ceph_pool_perm_check(inode, need);
if (ret < 0)
return ret;
BUG_ON(want & ~(CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO |
CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
CEPH_CAP_ANY_DIR_OPS));
if (need) {
ret = ceph_pool_perm_check(inode, need);
if (ret < 0)
return ret;
}
ret = try_get_cap_refs(inode, need, want, 0,
(nonblock ? NON_BLOCKING : 0), got);

31
fs/ceph/mds_client.c
View File

@ -699,6 +699,7 @@ void ceph_mdsc_release_request(struct kref *kref)
struct ceph_mds_request *req = container_of(kref,
struct ceph_mds_request,
r_kref);
ceph_mdsc_release_dir_caps(req);
destroy_reply_info(&req->r_reply_info);
if (req->r_request)
ceph_msg_put(req->r_request);
@ -3280,6 +3281,17 @@ bad:
return;
}
void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
{
int dcaps;
dcaps = xchg(&req->r_dir_caps, 0);
if (dcaps) {
dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
}
}
/*
* called under session->mutex.
*/
@ -3307,9 +3319,14 @@ static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
continue;
if (req->r_attempts == 0)
continue; /* only old requests */
if (req->r_session &&
req->r_session->s_mds == session->s_mds)
__send_request(mdsc, session, req, true);
if (!req->r_session)
continue;
if (req->r_session->s_mds != session->s_mds)
continue;
ceph_mdsc_release_dir_caps(req);
__send_request(mdsc, session, req, true);
}
mutex_unlock(&mdsc->mutex);
}
@ -3393,7 +3410,7 @@ fail_msg:
/*
* Encode information about a cap for a reconnect with the MDS.
*/
static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
static int reconnect_caps_cb(struct inode *inode, struct ceph_cap *cap,
void *arg)
{
union {
@ -3416,6 +3433,10 @@ static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
cap->mseq = 0; /* and migrate_seq */
cap->cap_gen = cap->session->s_cap_gen;
/* These are lost when the session goes away */
if (S_ISDIR(inode->i_mode))
cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
if (recon_state->msg_version >= 2) {
rec.v2.cap_id = cpu_to_le64(cap->cap_id);
rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
@ -3712,7 +3733,7 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc,
recon_state.msg_version = 2;
}
/* trsaverse this session's caps */
err = ceph_iterate_session_caps(session, encode_caps_cb, &recon_state);
err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
spin_lock(&session->s_cap_lock);
session->s_cap_reconnect = 0;

6
fs/ceph/mds_client.h
View File

@ -284,8 +284,11 @@ struct ceph_mds_request {
struct ceph_msg *r_request; /* original request */
struct ceph_msg *r_reply;
struct ceph_mds_reply_info_parsed r_reply_info;
struct page *r_locked_page;
int r_err;
struct page *r_locked_page;
int r_dir_caps;
int r_num_caps;
u32 r_readdir_offset;
@ -489,6 +492,7 @@ extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
struct inode *dir,
struct ceph_mds_request *req);
extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req);
static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
{
kref_get(&req->r_kref);

6
include/linux/ceph/ceph_fs.h
View File

@ -663,6 +663,12 @@ int ceph_flags_to_mode(int flags);
#define CEPH_CAP_LOCKS (CEPH_LOCK_IFILE | CEPH_LOCK_IAUTH | CEPH_LOCK_ILINK | \
CEPH_LOCK_IXATTR)
/* cap masks async dir operations */
#define CEPH_CAP_DIR_CREATE CEPH_CAP_FILE_CACHE
#define CEPH_CAP_DIR_UNLINK CEPH_CAP_FILE_RD
#define CEPH_CAP_ANY_DIR_OPS (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD | \
CEPH_CAP_FILE_WREXTEND | CEPH_CAP_FILE_LAZYIO)
int ceph_caps_for_mode(int mode);
enum {