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ceph: handle the new nfiles/nsubdirs fields in cap message 

Without these new fields, stale st_size is returned in following
case.

1. MDS modifies a directory
2. MDS issues CEPH_CAP_ANY_SHARED to client
3. The client satifies stat(2) by its cached metadata. set st_size
   to "i_files + i_subdirs".

Link: http://tracker.ceph.com/issues/23855
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng 2018-04-27 11:11:31 +08:00 committed by Ilya Dryomov
parent a1c6b83581
commit 4985d6f9e5
1 changed files with 34 additions and 5 deletions
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39
fs/ceph/caps.c
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@ -3030,6 +3030,10 @@ struct cap_extra_info {
u64 inline_version;
void *inline_data;
u32 inline_len;
/* dirstat */
bool dirstat_valid;
u64 nfiles;
u64 nsubdirs;
/* currently issued */
int issued;
};
@ -3154,6 +3158,11 @@ static void handle_cap_grant(struct inode *inode,
&ctime, &mtime, &atime);
}
if ((newcaps & CEPH_CAP_FILE_SHARED) && extra_info->dirstat_valid) {
ci->i_files = extra_info->nfiles;
ci->i_subdirs = extra_info->nsubdirs;
}
if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) {
/* file layout may have changed */
s64 old_pool = ci->i_layout.pool_id;
@ -3741,6 +3750,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
struct ceph_mds_cap_peer *peer = NULL;
struct ceph_snap_realm *realm = NULL;
int op;
int msg_version = le16_to_cpu(msg->hdr.version);
u32 seq, mseq;
struct ceph_vino vino;
void *snaptrace;
@ -3765,7 +3775,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
snaptrace_len = le32_to_cpu(h->snap_trace_len);
p = snaptrace + snaptrace_len;
if (le16_to_cpu(msg->hdr.version) >= 2) {
if (msg_version >= 2) {
u32 flock_len;
ceph_decode_32_safe(&p, end, flock_len, bad);
if (p + flock_len > end)
@ -3773,7 +3783,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
p += flock_len;
}
if (le16_to_cpu(msg->hdr.version) >= 3) {
if (msg_version >= 3) {
if (op == CEPH_CAP_OP_IMPORT) {
if (p + sizeof(*peer) > end)
goto bad;
@ -3785,7 +3795,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
}
}
if (le16_to_cpu(msg->hdr.version) >= 4) {
if (msg_version >= 4) {
ceph_decode_64_safe(&p, end, extra_info.inline_version, bad);
ceph_decode_32_safe(&p, end, extra_info.inline_len, bad);
if (p + extra_info.inline_len > end)
@ -3794,7 +3804,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
p += extra_info.inline_len;
}
if (le16_to_cpu(msg->hdr.version) >= 5) {
if (msg_version >= 5) {
struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
u32 epoch_barrier;
@ -3802,7 +3812,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
ceph_osdc_update_epoch_barrier(osdc, epoch_barrier);
}
if (le16_to_cpu(msg->hdr.version) >= 8) {
if (msg_version >= 8) {
u64 flush_tid;
u32 caller_uid, caller_gid;
u32 pool_ns_len;
@ -3822,6 +3832,25 @@ void ceph_handle_caps(struct ceph_mds_session *session,
}
}
if (msg_version >= 11) {
struct ceph_timespec *btime;
u64 change_attr;
u32 flags;
/* version >= 9 */
if (p + sizeof(*btime) > end)
goto bad;
btime = p;
p += sizeof(*btime);
ceph_decode_64_safe(&p, end, change_attr, bad);
/* version >= 10 */
ceph_decode_32_safe(&p, end, flags, bad);
/* version >= 11 */
extra_info.dirstat_valid = true;
ceph_decode_64_safe(&p, end, extra_info.nfiles, bad);
ceph_decode_64_safe(&p, end, extra_info.nsubdirs, bad);
}
/* lookup ino */
inode = ceph_find_inode(mdsc->fsc->sb, vino);
ci = ceph_inode(inode);