ceph: perform lazy writes when file mode and caps permit

If we have marked a file as "lazy" (using the ceph ioctl), perform buffered
writes when the MDS caps allow it.

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 3 insertions, 4 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index b81be9a56487..1a70a3ebf013 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -337,8 +337,7 @@ static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
 }
 
 /*
- * Return id of any MDS with a cap, preferably FILE_WR|WRBUFFER|EXCL, else
- * -1.
+ * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
  */
 static int __ceph_get_cap_mds(struct ceph_inode_info *ci, u32 *mseq)
 {
@@ -346,7 +345,7 @@ static int __ceph_get_cap_mds(struct ceph_inode_info *ci, u32 *mseq)
         int mds = -1;
         struct rb_node *p;
 
-        /* prefer mds with WR|WRBUFFER|EXCL caps */
+        /* prefer mds with WR|BUFFER|EXCL caps */
         for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
                 cap = rb_entry(p, struct ceph_cap, ci_node);
                 mds = cap->mds;
@@ -831,7 +830,7 @@ int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
 {
         int want = 0;
         int mode;
-        for (mode = 0; mode < 4; mode++)
+        for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
                 if (ci->i_nr_by_mode[mode])
                         want |= ceph_caps_for_mode(mode);
         return want;