ceph: remove exported caps when handling cap import message

Version 3 cap import message includes the ID of the exported
caps. It allow us to remove the exported caps if we still haven't
received the corresponding cap export message.

We remove the exported caps because they are stale, keeping them
can compromise consistence.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>

1 files changed, 52 insertions, 27 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index d65ff334901c..98f3ca4a5ddf 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -611,6 +611,7 @@ retry:
                 if (ci->i_auth_cap == NULL ||
                     ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0)
                         ci->i_auth_cap = cap;
+                ci->i_cap_exporting_issued = 0;
         } else if (ci->i_auth_cap == cap) {
                 ci->i_auth_cap = NULL;
                 spin_lock(&mdsc->cap_dirty_lock);
@@ -2823,10 +2824,12 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
  */
 static void handle_cap_import(struct ceph_mds_client *mdsc,
                               struct inode *inode, struct ceph_mds_caps *im,
+                              struct ceph_mds_cap_peer *ph,
                               struct ceph_mds_session *session,
                               void *snaptrace, int snaptrace_len)
 {
         struct ceph_inode_info *ci = ceph_inode(inode);
+        struct ceph_cap *cap;
         int mds = session->s_mds;
         unsigned issued = le32_to_cpu(im->caps);
         unsigned wanted = le32_to_cpu(im->wanted);
@@ -2834,28 +2837,44 @@ static void handle_cap_import(struct ceph_mds_client *mdsc,
         unsigned mseq = le32_to_cpu(im->migrate_seq);
         u64 realmino = le64_to_cpu(im->realm);
         u64 cap_id = le64_to_cpu(im->cap_id);
+        u64 p_cap_id;
+        int peer;
 
-        if (ci->i_cap_exporting_mds >= 0 &&
-            ceph_seq_cmp(ci->i_cap_exporting_mseq, mseq) < 0) {
-                dout("handle_cap_import inode %p ci %p mds%d mseq %d"
-                     " - cleared exporting from mds%d\n",
-                     inode, ci, mds, mseq,
-                     ci->i_cap_exporting_mds);
-                ci->i_cap_exporting_issued = 0;
-                ci->i_cap_exporting_mseq = 0;
-                ci->i_cap_exporting_mds = -1;
+        if (ph) {
+                p_cap_id = le64_to_cpu(ph->cap_id);
+                peer = le32_to_cpu(ph->mds);
+        } else {
+                p_cap_id = 0;
+                peer = -1;
+        }
 
-                spin_lock(&mdsc->cap_dirty_lock);
-                if (!list_empty(&ci->i_dirty_item)) {
-                        dout(" moving %p back to cap_dirty\n", inode);
-                        list_move(&ci->i_dirty_item, &mdsc->cap_dirty);
+        dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
+             inode, ci, mds, mseq, peer);
+
+        spin_lock(&ci->i_ceph_lock);
+        cap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
+        if (cap && cap->cap_id == p_cap_id) {
+                dout(" remove export cap %p mds%d flags %d\n",
+                     cap, peer, ph->flags);
+                if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
+                    (cap->seq != le32_to_cpu(ph->seq) ||
+                     cap->mseq != le32_to_cpu(ph->mseq))) {
+                        pr_err("handle_cap_import: mismatched seq/mseq: "
+                               "ino (%llx.%llx) mds%d seq %d mseq %d "
+                               "importer mds%d has peer seq %d mseq %d\n",
+                               ceph_vinop(inode), peer, cap->seq,
+                               cap->mseq, mds, le32_to_cpu(ph->seq),
+                               le32_to_cpu(ph->mseq));
                 }
-                spin_unlock(&mdsc->cap_dirty_lock);
-        } else {
-                dout("handle_cap_import inode %p ci %p mds%d mseq %d\n",
-                     inode, ci, mds, mseq);
+                ci->i_cap_exporting_issued = cap->issued;
+                __ceph_remove_cap(cap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
         }
 
+        /* make sure we re-request max_size, if necessary */
+        ci->i_wanted_max_size = 0;
+        ci->i_requested_max_size = 0;
+        spin_unlock(&ci->i_ceph_lock);
+
         down_write(&mdsc->snap_rwsem);
         ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len,
                                false);
@@ -2866,11 +2885,6 @@ static void handle_cap_import(struct ceph_mds_client *mdsc,
         kick_flushing_inode_caps(mdsc, session, inode);
         up_read(&mdsc->snap_rwsem);
 
-        /* make sure we re-request max_size, if necessary */
-        spin_lock(&ci->i_ceph_lock);
-        ci->i_wanted_max_size = 0;  /* reset */
-        ci->i_requested_max_size = 0;
-        spin_unlock(&ci->i_ceph_lock);
 }
 
 /*
@@ -2888,6 +2902,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
         struct ceph_inode_info *ci;
         struct ceph_cap *cap;
         struct ceph_mds_caps *h;
+        struct ceph_mds_cap_peer *peer = NULL;
         int mds = session->s_mds;
         int op;
         u32 seq, mseq;
@@ -2898,12 +2913,14 @@ void ceph_handle_caps(struct ceph_mds_session *session,
         void *snaptrace;
         size_t snaptrace_len;
         void *flock;
+        void *end;
         u32 flock_len;
         int open_target_sessions = 0;
 
         dout("handle_caps from mds%d\n", mds);
 
         /* decode */
+        end = msg->front.iov_base + msg->front.iov_len;
         tid = le64_to_cpu(msg->hdr.tid);
         if (msg->front.iov_len < sizeof(*h))
                 goto bad;
@@ -2921,17 +2938,25 @@ void ceph_handle_caps(struct ceph_mds_session *session,
         snaptrace_len = le32_to_cpu(h->snap_trace_len);
 
         if (le16_to_cpu(msg->hdr.version) >= 2) {
-                void *p, *end;
-
-                p = snaptrace + snaptrace_len;
-                end = msg->front.iov_base + msg->front.iov_len;
+                void *p = snaptrace + snaptrace_len;
                 ceph_decode_32_safe(&p, end, flock_len, bad);
+                if (p + flock_len > end)
+                        goto bad;
                 flock = p;
         } else {
                 flock = NULL;
                 flock_len = 0;
         }
 
+        if (le16_to_cpu(msg->hdr.version) >= 3) {
+                if (op == CEPH_CAP_OP_IMPORT) {
+                        void *p = flock + flock_len;
+                        if (p + sizeof(*peer) > end)
+                                goto bad;
+                        peer = p;
+                }
+        }
+
         mutex_lock(&session->s_mutex);
         session->s_seq++;
         dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
@@ -2968,7 +2993,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
                 goto done;
 
         case CEPH_CAP_OP_IMPORT:
-                handle_cap_import(mdsc, inode, h, session,
+                handle_cap_import(mdsc, inode, h, peer, session,
                                   snaptrace, snaptrace_len);
         }