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authorSage Weil <sage@newdream.net>2011-02-04 21:38:47 -0800
committerSage Weil <sage@newdream.net>2011-03-15 09:14:03 -0700
commit09adc80c611bb8902daa8ccfe34dbbc009d6befe (patch)
tree56d6096d2c4983a47acd7bb0a0f5d6e9c7fae331 /fs/ceph
parentb09734b1f4abd86e046777f0f268215b4ef1b523 (diff)
downloadop-kernel-dev-09adc80c611bb8902daa8ccfe34dbbc009d6befe.zip
op-kernel-dev-09adc80c611bb8902daa8ccfe34dbbc009d6befe.tar.gz
ceph: preserve I_COMPLETE across rename
d_move puts the renamed dentry at the end of d_subdirs, screwing with our cached dentry directory offsets. We were just clearing I_COMPLETE to avoid any possibility of trouble. However, assigning the renamed dentry an offset at the end of the directory (to match it's new d_subdirs position) is sufficient to maintain correct behavior and hold onto I_COMPLETE. This is especially important for workloads like rsync, which renames files into place. Before, we would lose I_COMPLETE and do MDS lookups for each file. With this patch we only talk to the MDS on create and rename. Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/inode.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 193bfa5..6045636 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -1030,9 +1030,6 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
dout("fill_trace doing d_move %p -> %p\n",
req->r_old_dentry, dn);
- /* d_move screws up d_subdirs order */
- ceph_i_clear(dir, CEPH_I_COMPLETE);
-
d_move(req->r_old_dentry, dn);
dout(" src %p '%.*s' dst %p '%.*s'\n",
req->r_old_dentry,
@@ -1044,12 +1041,15 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
rehashing bug in vfs_rename_dir */
ceph_invalidate_dentry_lease(dn);
- /* take overwritten dentry's readdir offset */
- dout("dn %p gets %p offset %lld (old offset %lld)\n",
- req->r_old_dentry, dn, ceph_dentry(dn)->offset,
+ /*
+ * d_move() puts the renamed dentry at the end of
+ * d_subdirs. We need to assign it an appropriate
+ * directory offset so we can behave when holding
+ * I_COMPLETE.
+ */
+ ceph_set_dentry_offset(req->r_old_dentry);
+ dout("dn %p gets new offset %lld\n", req->r_old_dentry,
ceph_dentry(req->r_old_dentry)->offset);
- ceph_dentry(req->r_old_dentry)->offset =
- ceph_dentry(dn)->offset;
dn = req->r_old_dentry; /* use old_dentry */
in = dn->d_inode;
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