From: "Yan, Zheng" <zyan@redhat.com>
Date: Fri, 27 Apr 2018 11:11:31 +0800
Subject: ceph: handle the new nfiles/nsubdirs fields in cap message
Git-commit: 4985d6f9e50fa48e35a9dbe1726434f987305cae
Patch-mainline: v4.18-rc1
References: FATE#324714

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>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
 fs/ceph/caps.c |   39 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 5 deletions(-)

--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3029,6 +3029,10 @@ 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;
 };
@@ -3153,6 +3157,11 @@ static void handle_cap_grant(struct inod
 				    &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;
@@ -3740,6 +3749,7 @@ void ceph_handle_caps(struct ceph_mds_se
 	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;
@@ -3764,7 +3774,7 @@ void ceph_handle_caps(struct ceph_mds_se
 	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)
@@ -3772,7 +3782,7 @@ void ceph_handle_caps(struct ceph_mds_se
 		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;
@@ -3784,7 +3794,7 @@ void ceph_handle_caps(struct ceph_mds_se
 		}
 	}
 
-	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)
@@ -3793,7 +3803,7 @@ void ceph_handle_caps(struct ceph_mds_se
 		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;
 
@@ -3801,7 +3811,7 @@ void ceph_handle_caps(struct ceph_mds_se
 		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;
@@ -3821,6 +3831,25 @@ void ceph_handle_caps(struct ceph_mds_se
 		}
 	}
 
+	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);