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Commit 3469ed0d authored by Yan, Zheng's avatar Yan, Zheng Committed by Ilya Dryomov
Browse files

ceph: include 'follows' of pending snapflush in cap reconnect message 



This helps the recovering MDS to reconstruct the internal states that
tracking pending snapflush.

Signed-off-by: default avatarYan, Zheng <zyan@redhat.com>
parent 121f22a1

fs/ceph/mds_client.c

+16 −1
Original line number Diff line number Diff line
@@ -2797,6 +2797,7 @@ static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, 
	char *path;

	int pathlen, err;

	u64 pathbase;

	u64 snap_follows;

	struct dentry *dentry;



	ci = cap->ci;
@@ -2843,6 +2844,15 @@ static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, 
		rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);

		rec.v1.pathbase = cpu_to_le64(pathbase);

	}



	if (list_empty(&ci->i_cap_snaps)) {

		snap_follows = 0;

	} else {

		struct ceph_cap_snap *capsnap =

			list_first_entry(&ci->i_cap_snaps,

					 struct ceph_cap_snap, ci_item);

		snap_follows = capsnap->follows;

	}

	spin_unlock(&ci->i_ceph_lock);



	if (recon_state->msg_version >= 2) {
@@ -2872,7 +2882,7 @@ static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, 
		if (recon_state->msg_version >= 3) {

			/* version, compat_version and struct_len */

			total_len = 2 * sizeof(u8) + sizeof(u32);

			struct_v = 1;

			struct_v = 2;

		}

		/*

		 * number of encoded locks is stable, so copy to pagelist
@@ -2885,6 +2895,9 @@ static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, 
		struct_len += sizeof(rec.v2);

		struct_len += sizeof(u32) + pathlen;



		if (struct_v >= 2)

			struct_len += sizeof(u64); /* snap_follows */



		total_len += struct_len;

		err = ceph_pagelist_reserve(pagelist, total_len);
@@ -2899,6 +2912,8 @@ static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, 
			ceph_locks_to_pagelist(flocks, pagelist,

					       num_fcntl_locks,

					       num_flock_locks);

			if (struct_v >= 2)

				ceph_pagelist_encode_64(pagelist, snap_follows);

		}

		kfree(flocks);

	} else {