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-rw-r--r--fs/ceph/caps.c42
1 files changed, 32 insertions, 10 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 3710e077a857..aa2239fa9a3b 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -1205,6 +1205,12 @@ retry:
if (capsnap->dirty_pages || capsnap->writing)
continue;
+ /*
+ * if cap writeback already occurred, we should have dropped
+ * the capsnap in ceph_put_wrbuffer_cap_refs.
+ */
+ BUG_ON(capsnap->dirty == 0);
+
/* pick mds, take s_mutex */
mds = __ceph_get_cap_mds(ci, &mseq);
if (session && session->s_mds != mds) {
@@ -2118,8 +2124,8 @@ void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
}
spin_unlock(&inode->i_lock);
- dout("put_cap_refs %p had %s %s\n", inode, ceph_cap_string(had),
- last ? "last" : "");
+ dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
+ last ? " last" : "", put ? " put" : "");
if (last && !flushsnaps)
ceph_check_caps(ci, 0, NULL);
@@ -2143,7 +2149,8 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
{
struct inode *inode = &ci->vfs_inode;
int last = 0;
- int last_snap = 0;
+ int complete_capsnap = 0;
+ int drop_capsnap = 0;
int found = 0;
struct ceph_cap_snap *capsnap = NULL;
@@ -2166,19 +2173,32 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
if (capsnap->context == snapc) {
found = 1;
- capsnap->dirty_pages -= nr;
- last_snap = !capsnap->dirty_pages;
break;
}
}
BUG_ON(!found);
+ capsnap->dirty_pages -= nr;
+ if (capsnap->dirty_pages == 0) {
+ complete_capsnap = 1;
+ if (capsnap->dirty == 0)
+ /* cap writeback completed before we created
+ * the cap_snap; no FLUSHSNAP is needed */
+ drop_capsnap = 1;
+ }
dout("put_wrbuffer_cap_refs on %p cap_snap %p "
- " snap %lld %d/%d -> %d/%d %s%s\n",
+ " snap %lld %d/%d -> %d/%d %s%s%s\n",
inode, capsnap, capsnap->context->seq,
ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
ci->i_wrbuffer_ref, capsnap->dirty_pages,
last ? " (wrbuffer last)" : "",
- last_snap ? " (capsnap last)" : "");
+ complete_capsnap ? " (complete capsnap)" : "",
+ drop_capsnap ? " (drop capsnap)" : "");
+ if (drop_capsnap) {
+ ceph_put_snap_context(capsnap->context);
+ list_del(&capsnap->ci_item);
+ list_del(&capsnap->flushing_item);
+ ceph_put_cap_snap(capsnap);
+ }
}
spin_unlock(&inode->i_lock);
@@ -2186,10 +2206,12 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
if (last) {
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
iput(inode);
- } else if (last_snap) {
+ } else if (complete_capsnap) {
ceph_flush_snaps(ci);
wake_up(&ci->i_cap_wq);
}
+ if (drop_capsnap)
+ iput(inode);
}
/*
@@ -2465,8 +2487,8 @@ static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
break;
}
WARN_ON(capsnap->dirty_pages || capsnap->writing);
- dout(" removing cap_snap %p follows %lld\n",
- capsnap, follows);
+ dout(" removing %p cap_snap %p follows %lld\n",
+ inode, capsnap, follows);
ceph_put_snap_context(capsnap->context);
list_del(&capsnap->ci_item);
list_del(&capsnap->flushing_item);