ceph: include dirty xattrs state in snapped caps

When we snapshot dirty metadata that needs to be written back to the MDS,
include dirty xattr metadata.  Make the capsnap reference the encoded
xattr blob so that it will be written back in the FLUSHSNAP op.

Also fix the capsnap creation guard to include dirty auth or file bits,
not just tests specific to dirty file data or file writes in progress
(this fixes auth metadata writeback).

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

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 0ac2703f3bdf0c973b1ba2a3f61fa3b0d1c6f46e..ba5bbf318fe130d44dab0ab2169eac64d6bb93f3 100644 (file)
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -1282,7 +1282,7 @@ retry:
                             &capsnap->mtime, &capsnap->atime,
                             capsnap->time_warp_seq,
                             capsnap->uid, capsnap->gid, capsnap->mode,
-                            0, NULL,
+                            capsnap->xattr_version, capsnap->xattr_blob,
                             capsnap->follows);
 
                next_follows = capsnap->follows + 1;

diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index c0b26b6badba7f53d0d8b32be33c165fb762922e..2cb190c2bd99d38fcc29d5ffa46467259abcba87 100644 (file)
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -435,7 +435,7 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci)
 {
        struct inode *inode = &ci->vfs_inode;
        struct ceph_cap_snap *capsnap;
-       int used;
+       int used, dirty;
 
        capsnap = kzalloc(sizeof(*capsnap), GFP_NOFS);
        if (!capsnap) {
@@ -445,6 +445,7 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci)
 
        spin_lock(&inode->i_lock);
        used = __ceph_caps_used(ci);
+       dirty = __ceph_caps_dirty(ci);
        if (__ceph_have_pending_cap_snap(ci)) {
                /* there is no point in queuing multiple "pending" cap_snaps,
                   as no new writes are allowed to start when pending, so any
@@ -452,11 +453,13 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci)
                   cap_snap.  lucky us. */
                dout("queue_cap_snap %p already pending\n", inode);
                kfree(capsnap);
-       } else if (ci->i_wrbuffer_ref_head || (used & CEPH_CAP_FILE_WR)) {
+       } else if (ci->i_wrbuffer_ref_head || (used & CEPH_CAP_FILE_WR) ||
+                  (dirty & (CEPH_CAP_AUTH_EXCL|CEPH_CAP_XATTR_EXCL|
+                            CEPH_CAP_FILE_EXCL|CEPH_CAP_FILE_WR))) {
                struct ceph_snap_context *snapc = ci->i_head_snapc;
 
                igrab(inode);
-
+               
                atomic_set(&capsnap->nref, 1);
                capsnap->ci = ci;
                INIT_LIST_HEAD(&capsnap->ci_item);
@@ -464,15 +467,21 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci)
 
                capsnap->follows = snapc->seq - 1;
                capsnap->issued = __ceph_caps_issued(ci, NULL);
-               capsnap->dirty = __ceph_caps_dirty(ci);
+               capsnap->dirty = dirty;
 
                capsnap->mode = inode->i_mode;
                capsnap->uid = inode->i_uid;
                capsnap->gid = inode->i_gid;
 
-               /* fixme? */
-               capsnap->xattr_blob = NULL;
-               capsnap->xattr_len = 0;
+               if (dirty & CEPH_CAP_XATTR_EXCL) {
+                       __ceph_build_xattrs_blob(ci);
+                       capsnap->xattr_blob =
+                               ceph_buffer_get(ci->i_xattrs.blob);
+                       capsnap->xattr_version = ci->i_xattrs.version;
+               } else {
+                       capsnap->xattr_blob = NULL;
+                       capsnap->xattr_version = 0;
+               }
 
                /* dirty page count moved from _head to this cap_snap;
                   all subsequent writes page dirties occur _after_ this

diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 2482d696f0de17f2fcccdedfc79d2ad4a14c6664..b33929d8f287134792d390d57e7e0741d129e077 100644 (file)
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -216,8 +216,7 @@ struct ceph_cap_snap {
        uid_t uid;
        gid_t gid;
 
-       void *xattr_blob;
-       int xattr_len;
+       struct ceph_buffer *xattr_blob;
        u64 xattr_version;
 
        u64 size;
@@ -229,8 +228,11 @@ struct ceph_cap_snap {
 
 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
 {
-       if (atomic_dec_and_test(&capsnap->nref))
+       if (atomic_dec_and_test(&capsnap->nref)) {
+               if (capsnap->xattr_blob)
+                       ceph_buffer_put(capsnap->xattr_blob);
                kfree(capsnap);
+       }
 }
 
 /*

diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 097a2654c00f517c004ef429b3c0046664f205c3..9578af610b73fb48b69872ddeed222e58c8340f0 100644 (file)
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -485,6 +485,7 @@ void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
                ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
                ci->i_xattrs.prealloc_blob = NULL;
                ci->i_xattrs.dirty = false;
+               ci->i_xattrs.version++;
        }
 }