Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client

Pull ceph updates from Sage Weil:
 "The big item here is support for inline data for CephFS and for
  message signatures from Zheng.  There are also several bug fixes,
  including interrupted flock request handling, 0-length xattrs, mksnap,
  cached readdir results, and a message version compat field.  Finally
  there are several cleanups from Ilya, Dan, and Markus.

  Note that there is another series coming soon that fixes some bugs in
  the RBD 'lingering' requests, but it isn't quite ready yet"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (27 commits)
  ceph: fix setting empty extended attribute
  ceph: fix mksnap crash
  ceph: do_sync is never initialized
  libceph: fixup includes in pagelist.h
  ceph: support inline data feature
  ceph: flush inline version
  ceph: convert inline data to normal data before data write
  ceph: sync read inline data
  ceph: fetch inline data when getting Fcr cap refs
  ceph: use getattr request to fetch inline data
  ceph: add inline data to pagecache
  ceph: parse inline data in MClientReply and MClientCaps
  libceph: specify position of extent operation
  libceph: add CREATE osd operation support
  libceph: add SETXATTR/CMPXATTR osd operations support
  rbd: don't treat CEPH_OSD_OP_DELETE as extent op
  ceph: remove unused stringification macros
  libceph: require cephx message signature by default
  ceph: introduce global empty snap context
  ceph: message versioning fixes
  ...

13 files changed, 712 insertions, 116 deletions

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 18c06bb..f5013d9 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -192,17 +192,30 @@ static int readpage_nounlock(struct file *filp, struct page *page)
 	struct ceph_osd_client *osdc =
 		&ceph_inode_to_client(inode)->client->osdc;
 	int err = 0;
+	u64 off = page_offset(page);
 	u64 len = PAGE_CACHE_SIZE;
 
-	err = ceph_readpage_from_fscache(inode, page);
+	if (off >= i_size_read(inode)) {
+		zero_user_segment(page, err, PAGE_CACHE_SIZE);
+		SetPageUptodate(page);
+		return 0;
+	}
 
+	/*
+	 * Uptodate inline data should have been added into page cache
+	 * while getting Fcr caps.
+	 */
+	if (ci->i_inline_version != CEPH_INLINE_NONE)
+		return -EINVAL;
+
+	err = ceph_readpage_from_fscache(inode, page);
 	if (err == 0)
 		goto out;
 
 	dout("readpage inode %p file %p page %p index %lu\n",
 	     inode, filp, page, page->index);
 	err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout,
-				  (u64) page_offset(page), &len,
+				  off, &len,
 				  ci->i_truncate_seq, ci->i_truncate_size,
 				  &page, 1, 0);
 	if (err == -ENOENT)
@@ -319,7 +332,7 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
 	     off, len);
 	vino = ceph_vino(inode);
 	req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len,
-				    1, CEPH_OSD_OP_READ,
+				    0, 1, CEPH_OSD_OP_READ,
 				    CEPH_OSD_FLAG_READ, NULL,
 				    ci->i_truncate_seq, ci->i_truncate_size,
 				    false);
@@ -384,6 +397,9 @@ static int ceph_readpages(struct file *file, struct address_space *mapping,
 	int rc = 0;
 	int max = 0;
 
+	if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE)
+		return -EINVAL;
+
 	rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list,
 					 &nr_pages);
 
@@ -673,7 +689,7 @@ static int ceph_writepages_start(struct address_space *mapping,
 	int rc = 0;
 	unsigned wsize = 1 << inode->i_blkbits;
 	struct ceph_osd_request *req = NULL;
-	int do_sync;
+	int do_sync = 0;
 	u64 truncate_size, snap_size;
 	u32 truncate_seq;
 
@@ -750,7 +766,6 @@ retry:
 	last_snapc = snapc;
 
 	while (!done && index <= end) {
-		int num_ops = do_sync ? 2 : 1;
 		unsigned i;
 		int first;
 		pgoff_t next;
@@ -850,7 +865,8 @@ get_more_pages:
 				len = wsize;
 				req = ceph_osdc_new_request(&fsc->client->osdc,
 							&ci->i_layout, vino,
-							offset, &len, num_ops,
+							offset, &len, 0,
+							do_sync ? 2 : 1,
 							CEPH_OSD_OP_WRITE,
 							CEPH_OSD_FLAG_WRITE |
 							CEPH_OSD_FLAG_ONDISK,
@@ -862,6 +878,9 @@ get_more_pages:
 					break;
 				}
 
+				if (do_sync)
+					osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC);
+
 				req->r_callback = writepages_finish;
 				req->r_inode = inode;
 
@@ -1204,6 +1223,7 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	struct inode *inode = file_inode(vma->vm_file);
 	struct ceph_inode_info *ci = ceph_inode(inode);
 	struct ceph_file_info *fi = vma->vm_file->private_data;
+	struct page *pinned_page = NULL;
 	loff_t off = vmf->pgoff << PAGE_CACHE_SHIFT;
 	int want, got, ret;
 
@@ -1215,7 +1235,8 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 		want = CEPH_CAP_FILE_CACHE;
 	while (1) {
 		got = 0;
-		ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
+		ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want,
+				    -1, &got, &pinned_page);
 		if (ret == 0)
 			break;
 		if (ret != -ERESTARTSYS) {
@@ -1226,12 +1247,54 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
 	     inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got));
 
-	ret = filemap_fault(vma, vmf);
+	if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
+	    ci->i_inline_version == CEPH_INLINE_NONE)
+		ret = filemap_fault(vma, vmf);
+	else
+		ret = -EAGAIN;
 
 	dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n",
 	     inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got), ret);
+	if (pinned_page)
+		page_cache_release(pinned_page);
 	ceph_put_cap_refs(ci, got);
 
+	if (ret != -EAGAIN)
+		return ret;
+
+	/* read inline data */
+	if (off >= PAGE_CACHE_SIZE) {
+		/* does not support inline data > PAGE_SIZE */
+		ret = VM_FAULT_SIGBUS;
+	} else {
+		int ret1;
+		struct address_space *mapping = inode->i_mapping;
+		struct page *page = find_or_create_page(mapping, 0,
+						mapping_gfp_mask(mapping) &
+						~__GFP_FS);
+		if (!page) {
+			ret = VM_FAULT_OOM;
+			goto out;
+		}
+		ret1 = __ceph_do_getattr(inode, page,
+					 CEPH_STAT_CAP_INLINE_DATA, true);
+		if (ret1 < 0 || off >= i_size_read(inode)) {
+			unlock_page(page);
+			page_cache_release(page);
+			ret = VM_FAULT_SIGBUS;
+			goto out;
+		}
+		if (ret1 < PAGE_CACHE_SIZE)
+			zero_user_segment(page, ret1, PAGE_CACHE_SIZE);
+		else
+			flush_dcache_page(page);
+		SetPageUptodate(page);
+		vmf->page = page;
+		ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
+	}
+out:
+	dout("filemap_fault %p %llu~%zd read inline data ret %d\n",
+	     inode, off, (size_t)PAGE_CACHE_SIZE, ret);
 	return ret;
 }
 
@@ -1250,6 +1313,19 @@ static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 	size_t len;
 	int want, got, ret;
 
+	if (ci->i_inline_version != CEPH_INLINE_NONE) {
+		struct page *locked_page = NULL;
+		if (off == 0) {
+			lock_page(page);
+			locked_page = page;
+		}
+		ret = ceph_uninline_data(vma->vm_file, locked_page);
+		if (locked_page)
+			unlock_page(locked_page);
+		if (ret < 0)
+			return VM_FAULT_SIGBUS;
+	}
+
 	if (off + PAGE_CACHE_SIZE <= size)
 		len = PAGE_CACHE_SIZE;
 	else
@@ -1263,7 +1339,8 @@ static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 		want = CEPH_CAP_FILE_BUFFER;
 	while (1) {
 		got = 0;
-		ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, off + len);
+		ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len,
+				    &got, NULL);
 		if (ret == 0)
 			break;
 		if (ret != -ERESTARTSYS) {
@@ -1297,11 +1374,13 @@ static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 			ret = VM_FAULT_SIGBUS;
 	}
 out:
-	if (ret != VM_FAULT_LOCKED) {
+	if (ret != VM_FAULT_LOCKED)
 		unlock_page(page);
-	} else {
+	if (ret == VM_FAULT_LOCKED ||
+	    ci->i_inline_version != CEPH_INLINE_NONE) {
 		int dirty;
 		spin_lock(&ci->i_ceph_lock);
+		ci->i_inline_version = CEPH_INLINE_NONE;
 		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
 		spin_unlock(&ci->i_ceph_lock);
 		if (dirty)
@@ -1315,6 +1394,178 @@ out:
 	return ret;
 }
 
+void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
+			   char	*data, size_t len)
+{
+	struct address_space *mapping = inode->i_mapping;
+	struct page *page;
+
+	if (locked_page) {
+		page = locked_page;
+	} else {
+		if (i_size_read(inode) == 0)
+			return;
+		page = find_or_create_page(mapping, 0,
+					   mapping_gfp_mask(mapping) & ~__GFP_FS);
+		if (!page)
+			return;
+		if (PageUptodate(page)) {
+			unlock_page(page);
+			page_cache_release(page);
+			return;
+		}
+	}
+
+	dout("fill_inline_data %p %llx.%llx len %lu locked_page %p\n",
+	     inode, ceph_vinop(inode), len, locked_page);
+
+	if (len > 0) {
+		void *kaddr = kmap_atomic(page);
+		memcpy(kaddr, data, len);
+		kunmap_atomic(kaddr);
+	}
+
+	if (page != locked_page) {
+		if (len < PAGE_CACHE_SIZE)
+			zero_user_segment(page, len, PAGE_CACHE_SIZE);
+		else
+			flush_dcache_page(page);
+
+		SetPageUptodate(page);
+		unlock_page(page);
+		page_cache_release(page);
+	}
+}
+
+int ceph_uninline_data(struct file *filp, struct page *locked_page)
+{
+	struct inode *inode = file_inode(filp);
+	struct ceph_inode_info *ci = ceph_inode(inode);
+	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
+	struct ceph_osd_request *req;
+	struct page *page = NULL;
+	u64 len, inline_version;
+	int err = 0;
+	bool from_pagecache = false;
+
+	spin_lock(&ci->i_ceph_lock);
+	inline_version = ci->i_inline_version;
+	spin_unlock(&ci->i_ceph_lock);
+
+	dout("uninline_data %p %llx.%llx inline_version %llu\n",
+	     inode, ceph_vinop(inode), inline_version);
+
+	if (inline_version == 1 || /* initial version, no data */
+	    inline_version == CEPH_INLINE_NONE)
+		goto out;
+
+	if (locked_page) {
+		page = locked_page;
+		WARN_ON(!PageUptodate(page));
+	} else if (ceph_caps_issued(ci) &
+		   (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) {
+		page = find_get_page(inode->i_mapping, 0);
+		if (page) {
+			if (PageUptodate(page)) {
+				from_pagecache = true;
+				lock_page(page);
+			} else {
+				page_cache_release(page);
+				page = NULL;
+			}
+		}
+	}
+
+	if (page) {
+		len = i_size_read(inode);
+		if (len > PAGE_CACHE_SIZE)
+			len = PAGE_CACHE_SIZE;
+	} else {
+		page = __page_cache_alloc(GFP_NOFS);
+		if (!page) {
+			err = -ENOMEM;
+			goto out;
+		}
+		err = __ceph_do_getattr(inode, page,
+					CEPH_STAT_CAP_INLINE_DATA, true);
+		if (err < 0) {
+			/* no inline data */
+			if (err == -ENODATA)
+				err = 0;
+			goto out;
+		}
+		len = err;
+	}
+
+	req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
+				    ceph_vino(inode), 0, &len, 0, 1,
+				    CEPH_OSD_OP_CREATE,
+				    CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
+				    ci->i_snap_realm->cached_context,
+				    0, 0, false);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
+		goto out;
+	}
+
+	ceph_osdc_build_request(req, 0, NULL, CEPH_NOSNAP, &inode->i_mtime);
+	err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
+	if (!err)
+		err = ceph_osdc_wait_request(&fsc->client->osdc, req);
+	ceph_osdc_put_request(req);
+	if (err < 0)
+		goto out;
+
+	req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
+				    ceph_vino(inode), 0, &len, 1, 3,
+				    CEPH_OSD_OP_WRITE,
+				    CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
+				    ci->i_snap_realm->cached_context,
+				    ci->i_truncate_seq, ci->i_truncate_size,
+				    false);
+	if (IS_ERR(req)) {
+		err = PTR_ERR(req);
+		goto out;
+	}
+
+	osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false);
+
+	err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
+				    "inline_version", &inline_version,
+				    sizeof(inline_version),
+				    CEPH_OSD_CMPXATTR_OP_GT,
+				    CEPH_OSD_CMPXATTR_MODE_U64);
+	if (err)
+		goto out_put;
+
+	err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
+				    "inline_version", &inline_version,
+				    sizeof(inline_version), 0, 0);
+	if (err)
+		goto out_put;
+
+	ceph_osdc_build_request(req, 0, NULL, CEPH_NOSNAP, &inode->i_mtime);
+	err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
+	if (!err)
+		err = ceph_osdc_wait_request(&fsc->client->osdc, req);
+out_put:
+	ceph_osdc_put_request(req);
+	if (err == -ECANCELED)
+		err = 0;
+out:
+	if (page && page != locked_page) {
+		if (from_pagecache) {
+			unlock_page(page);
+			page_cache_release(page);
+		} else
+			__free_pages(page, 0);
+	}
+
+	dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
+	     inode, ceph_vinop(inode), inline_version, err);
+	return err;
+}
+
 static struct vm_operations_struct ceph_vmops = {
 	.fault		= ceph_filemap_fault,
 	.page_mkwrite	= ceph_page_mkwrite,
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index cefca66..b93c631 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -975,10 +975,12 @@ static int send_cap_msg(struct ceph_mds_session *session,
 			kuid_t uid, kgid_t gid, umode_t mode,
 			u64 xattr_version,
 			struct ceph_buffer *xattrs_buf,
-			u64 follows)
+			u64 follows, bool inline_data)
 {
 	struct ceph_mds_caps *fc;
 	struct ceph_msg *msg;
+	void *p;
+	size_t extra_len;
 
 	dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
 	     " seq %u/%u mseq %u follows %lld size %llu/%llu"
@@ -988,7 +990,10 @@ static int send_cap_msg(struct ceph_mds_session *session,
 	     seq, issue_seq, mseq, follows, size, max_size,
 	     xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
 
-	msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS, false);
+	/* flock buffer size + inline version + inline data size */
+	extra_len = 4 + 8 + 4;
+	msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc) + extra_len,
+			   GFP_NOFS, false);
 	if (!msg)
 		return -ENOMEM;
 
@@ -1020,6 +1025,14 @@ static int send_cap_msg(struct ceph_mds_session *session,
 	fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid));
 	fc->mode = cpu_to_le32(mode);
 
+	p = fc + 1;
+	/* flock buffer size */
+	ceph_encode_32(&p, 0);
+	/* inline version */
+	ceph_encode_64(&p, inline_data ? 0 : CEPH_INLINE_NONE);
+	/* inline data size */
+	ceph_encode_32(&p, 0);
+
 	fc->xattr_version = cpu_to_le64(xattr_version);
 	if (xattrs_buf) {
 		msg->middle = ceph_buffer_get(xattrs_buf);
@@ -1126,6 +1139,7 @@ static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
 	u64 flush_tid = 0;
 	int i;
 	int ret;
+	bool inline_data;
 
 	held = cap->issued | cap->implemented;
 	revoking = cap->implemented & ~cap->issued;
@@ -1209,13 +1223,15 @@ static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
 		xattr_version = ci->i_xattrs.version;
 	}
 
+	inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
+
 	spin_unlock(&ci->i_ceph_lock);
 
 	ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
 		op, keep, want, flushing, seq, flush_tid, issue_seq, mseq,
 		size, max_size, &mtime, &atime, time_warp_seq,
 		uid, gid, mode, xattr_version, xattr_blob,
-		follows);
+		follows, inline_data);
 	if (ret < 0) {
 		dout("error sending cap msg, must requeue %p\n", inode);
 		delayed = 1;
@@ -1336,7 +1352,7 @@ retry:
 			     capsnap->time_warp_seq,
 			     capsnap->uid, capsnap->gid, capsnap->mode,
 			     capsnap->xattr_version, capsnap->xattr_blob,
-			     capsnap->follows);
+			     capsnap->follows, capsnap->inline_data);
 
 		next_follows = capsnap->follows + 1;
 		ceph_put_cap_snap(capsnap);
@@ -2057,15 +2073,17 @@ static void __take_cap_refs(struct ceph_inode_info *ci, int got)
  * requested from the MDS.
  */
 static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
-			    int *got, loff_t endoff, int *check_max, int *err)
+			    loff_t endoff, int *got, struct page **pinned_page,
+			    int *check_max, int *err)
 {
 	struct inode *inode = &ci->vfs_inode;
 	int ret = 0;
-	int have, implemented;
+	int have, implemented, _got = 0;
 	int file_wanted;
 
 	dout("get_cap_refs %p need %s want %s\n", inode,
 	     ceph_cap_string(need), ceph_cap_string(want));
+again:
 	spin_lock(&ci->i_ceph_lock);
 
 	/* make sure file is actually open */
@@ -2075,7 +2093,7 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
 		     ceph_cap_string(need), ceph_cap_string(file_wanted));
 		*err = -EBADF;
 		ret = 1;
-		goto out;
+		goto out_unlock;
 	}
 
 	/* finish pending truncate */
@@ -2095,7 +2113,7 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
 				*check_max = 1;
 				ret = 1;
 			}
-			goto out;
+			goto out_unlock;
 		}
 		/*
 		 * If a sync write is in progress, we must wait, so that we
@@ -2103,7 +2121,7 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
 		 */
 		if (__ceph_have_pending_cap_snap(ci)) {
 			dout("get_cap_refs %p cap_snap_pending\n", inode);
-			goto out;
+			goto out_unlock;
 		}
 	}
 
@@ -2120,18 +2138,50 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
 		     inode, ceph_cap_string(have), ceph_cap_string(not),
 		     ceph_cap_string(revoking));
 		if ((revoking & not) == 0) {
-			*got = need | (have & want);
-			__take_cap_refs(ci, *got);
+			_got = need | (have & want);
+			__take_cap_refs(ci, _got);
 			ret = 1;
 		}
 	} else {
 		dout("get_cap_refs %p have %s needed %s\n", inode,
 		     ceph_cap_string(have), ceph_cap_string(need));
 	}
-out:
+out_unlock:
 	spin_unlock(&ci->i_ceph_lock);
+
+	if (ci->i_inline_version != CEPH_INLINE_NONE &&
+	    (_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
+	    i_size_read(inode) > 0) {
+		int ret1;
+		struct page *page = find_get_page(inode->i_mapping, 0);
+		if (page) {
+			if (PageUptodate(page)) {
+				*pinned_page = page;
+				goto out;
+			}
+			page_cache_release(page);
+		}
+		/*
+		 * drop cap refs first because getattr while holding
+		 * caps refs can cause deadlock.
+		 */
+		ceph_put_cap_refs(ci, _got);
+		_got = 0;
+
+		/* getattr request will bring inline data into page cache */
+		ret1 = __ceph_do_getattr(inode, NULL,
+					 CEPH_STAT_CAP_INLINE_DATA, true);
+		if (ret1 >= 0) {
+			ret = 0;
+			goto again;
+		}
+		*err = ret1;
+		ret = 1;
+	}
+out:
 	dout("get_cap_refs %p ret %d got %s\n", inode,
-	     ret, ceph_cap_string(*got));
+	     ret, ceph_cap_string(_got));
+	*got = _got;
 	return ret;
 }
 
@@ -2168,8 +2218,8 @@ static void check_max_size(struct inode *inode, loff_t endoff)
  * due to a small max_size, make sure we check_max_size (and possibly
  * ask the mds) so we don't get hung up indefinitely.
  */
-int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got,
-		  loff_t endoff)
+int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
+		  loff_t endoff, int *got, struct page **pinned_page)
 {
 	int check_max, ret, err;
 
@@ -2179,8 +2229,8 @@ retry:
 	check_max = 0;
 	err = 0;
 	ret = wait_event_interruptible(ci->i_cap_wq,
-				       try_get_cap_refs(ci, need, want,
-							got, endoff,
+				       try_get_cap_refs(ci, need, want, endoff,
+							got, pinned_page,
 							&check_max, &err));
 	if (err)
 		ret = err;
@@ -2383,6 +2433,8 @@ static void invalidate_aliases(struct inode *inode)
 static void handle_cap_grant(struct ceph_mds_client *mdsc,
 			     struct inode *inode, struct ceph_mds_caps *grant,
 			     void *snaptrace, int snaptrace_len,
+			     u64 inline_version,
+			     void *inline_data, int inline_len,
 			     struct ceph_buffer *xattr_buf,
 			     struct ceph_mds_session *session,
 			     struct ceph_cap *cap, int issued)
@@ -2403,6 +2455,7 @@ static void handle_cap_grant(struct ceph_mds_client *mdsc,
 	bool queue_invalidate = false;
 	bool queue_revalidate = false;
 	bool deleted_inode = false;
+	bool fill_inline = false;
 
 	dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
 	     inode, cap, mds, seq, ceph_cap_string(newcaps));
@@ -2576,6 +2629,13 @@ static void handle_cap_grant(struct ceph_mds_client *mdsc,
 	}
 	BUG_ON(cap->issued & ~cap->implemented);
 
+	if (inline_version > 0 && inline_version >= ci->i_inline_version) {
+		ci->i_inline_version = inline_version;
+		if (ci->i_inline_version != CEPH_INLINE_NONE &&
+		    (newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)))
+			fill_inline = true;
+	}
+
 	spin_unlock(&ci->i_ceph_lock);
 
 	if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) {
@@ -2589,6 +2649,9 @@ static void handle_cap_grant(struct ceph_mds_client *mdsc,
 			wake = true;
 	}
 
+	if (fill_inline)
+		ceph_fill_inline_data(inode, NULL, inline_data, inline_len);
+
 	if (queue_trunc) {
 		ceph_queue_vmtruncate(inode);
 		ceph_queue_revalidate(inode);
@@ -2996,11 +3059,12 @@ void ceph_handle_caps(struct ceph_mds_session *session,
 	u64 cap_id;
 	u64 size, max_size;
 	u64 tid;
+	u64 inline_version = 0;
+	void *inline_data = NULL;
+	u32  inline_len = 0;
 	void *snaptrace;
 	size_t snaptrace_len;
-	void *flock;
-	void *end;
-	u32 flock_len;
+	void *p, *end;
 
 	dout("handle_caps from mds%d\n", mds);
 
@@ -3021,30 +3085,37 @@ void ceph_handle_caps(struct ceph_mds_session *session,
 
 	snaptrace = h + 1;
 	snaptrace_len = le32_to_cpu(h->snap_trace_len);
+	p = snaptrace + snaptrace_len;
 
 	if (le16_to_cpu(msg->hdr.version) >= 2) {
-		void *p = snaptrace + snaptrace_len;
+		u32 flock_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;
+		p += flock_len;
 	}
 
 	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;
+			p += sizeof(*peer);
 		} else if (op == CEPH_CAP_OP_EXPORT) {
 			/* recorded in unused fields */
 			peer = (void *)&h->size;
 		}
 	}
 
+	if (le16_to_cpu(msg->hdr.version) >= 4) {
+		ceph_decode_64_safe(&p, end, inline_version, bad);
+		ceph_decode_32_safe(&p, end, inline_len, bad);
+		if (p + inline_len > end)
+			goto bad;
+		inline_data = p;
+		p += inline_len;
+	}
+
 	/* lookup ino */
 	inode = ceph_find_inode(sb, vino);
 	ci = ceph_inode(inode);
@@ -3085,6 +3156,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
 		handle_cap_import(mdsc, inode, h, peer, session,
 				  &cap, &issued);
 		handle_cap_grant(mdsc, inode, h,  snaptrace, snaptrace_len,
+				 inline_version, inline_data, inline_len,
 				 msg->middle, session, cap, issued);
 		goto done_unlocked;
 	}
@@ -3105,8 +3177,9 @@ void ceph_handle_caps(struct ceph_mds_session *session,
 	case CEPH_CAP_OP_GRANT:
 		__ceph_caps_issued(ci, &issued);
 		issued |= __ceph_caps_dirty(ci);
-		handle_cap_grant(mdsc, inode, h, NULL, 0, msg->middle,
-				 session, cap, issued);
+		handle_cap_grant(mdsc, inode, h, NULL, 0,
+				 inline_version, inline_data, inline_len,
+				 msg->middle, session, cap, issued);
 		goto done_unlocked;
 
 	case CEPH_CAP_OP_FLUSH_ACK:
@@ -3137,8 +3210,7 @@ flush_cap_releases:
 done:
 	mutex_unlock(&session->s_mutex);
 done_unlocked:
-	if (inode)
-		iput(inode);
+	iput(inode);
 	return;
 
 bad:
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 681a853..c241603 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -183,7 +183,7 @@ more:
 	spin_unlock(&parent->d_lock);
 
 	/* make sure a dentry wasn't dropped while we didn't have parent lock */
-	if (!ceph_dir_is_complete(dir)) {
+	if (!ceph_dir_is_complete_ordered(dir)) {
 		dout(" lost dir complete on %p; falling back to mds\n", dir);
 		dput(dentry);
 		err = -EAGAIN;
@@ -261,10 +261,6 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
 
 	/* always start with . and .. */
 	if (ctx->pos == 0) {
-		/* note dir version at start of readdir so we can tell
-		 * if any dentries get dropped */
-		fi->dir_release_count = atomic_read(&ci->i_release_count);
-
 		dout("readdir off 0 -> '.'\n");
 		if (!dir_emit(ctx, ".", 1, 
 			    ceph_translate_ino(inode->i_sb, inode->i_ino),
@@ -289,7 +285,7 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
 	if ((ctx->pos == 2 || fi->dentry) &&
 	    !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
 	    ceph_snap(inode) != CEPH_SNAPDIR &&
-	    __ceph_dir_is_complete(ci) &&
+	    __ceph_dir_is_complete_ordered(ci) &&
 	    __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
 		u32 shared_gen = ci->i_shared_gen;
 		spin_unlock(&ci->i_ceph_lock);
@@ -312,6 +308,13 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
 
 	/* proceed with a normal readdir */
 
+	if (ctx->pos == 2) {
+		/* note dir version at start of readdir so we can tell
+		 * if any dentries get dropped */
+		fi->dir_release_count = atomic_read(&ci->i_release_count);
+		fi->dir_ordered_count = ci->i_ordered_count;
+	}
+
 more:
 	/* do we have the correct frag content buffered? */
 	if (fi->frag != frag || fi->last_readdir == NULL) {
@@ -446,8 +449,12 @@ more:
 	 */
 	spin_lock(&ci->i_ceph_lock);
 	if (atomic_read(&ci->i_release_count) == fi->dir_release_count) {
-		dout(" marking %p complete\n", inode);
-		__ceph_dir_set_complete(ci, fi->dir_release_count);
+		if (ci->i_ordered_count == fi->dir_ordered_count)
+			dout(" marking %p complete and ordered\n", inode);
+		else
+			dout(" marking %p complete\n", inode);
+		__ceph_dir_set_complete(ci, fi->dir_release_count,
+					fi->dir_ordered_count);
 	}
 	spin_unlock(&ci->i_ceph_lock);
 
@@ -805,7 +812,9 @@ static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 		acls.pagelist = NULL;
 	}
 	err = ceph_mdsc_do_request(mdsc, dir, req);
-	if (!err && !req->r_reply_info.head->is_dentry)
+	if (!err &&
+	    !req->r_reply_info.head->is_target &&
+	    !req->r_reply_info.head->is_dentry)
 		err = ceph_handle_notrace_create(dir, dentry);
 	ceph_mdsc_put_request(req);
 out:
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 9f8e357..ce74b39 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -333,6 +333,11 @@ int ceph_release(struct inode *inode, struct file *file)
 	return 0;
 }
 
+enum {
+	CHECK_EOF = 1,
+	READ_INLINE = 2,
+};
+
 /*
  * Read a range of bytes striped over one or more objects.  Iterate over
  * objects we stripe over.  (That's not atomic, but good enough for now.)
@@ -412,7 +417,7 @@ more:
 		ret = read;
 		/* did we bounce off eof? */
 		if (pos + left > inode->i_size)
-			*checkeof = 1;
+			*checkeof = CHECK_EOF;
 	}
 
 	dout("striped_read returns %d\n", ret);
@@ -598,7 +603,7 @@ ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
 		snapc = ci->i_snap_realm->cached_context;
 		vino = ceph_vino(inode);
 		req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
-					    vino, pos, &len,
+					    vino, pos, &len, 0,
 					    2,/*include a 'startsync' command*/
 					    CEPH_OSD_OP_WRITE, flags, snapc,
 					    ci->i_truncate_seq,
@@ -609,6 +614,8 @@ ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
 			break;
 		}
 
+		osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC);
+
 		n = iov_iter_get_pages_alloc(from, &pages, len, &start);
 		if (unlikely(n < 0)) {
 			ret = n;
@@ -713,7 +720,7 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
 		snapc = ci->i_snap_realm->cached_context;
 		vino = ceph_vino(inode);
 		req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
-					    vino, pos, &len, 1,
+					    vino, pos, &len, 0, 1,
 					    CEPH_OSD_OP_WRITE, flags, snapc,
 					    ci->i_truncate_seq,
 					    ci->i_truncate_size,
@@ -803,9 +810,10 @@ static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
 	size_t len = iocb->ki_nbytes;
 	struct inode *inode = file_inode(filp);
 	struct ceph_inode_info *ci = ceph_inode(inode);
+	struct page *pinned_page = NULL;
 	ssize_t ret;
 	int want, got = 0;
-	int checkeof = 0, read = 0;
+	int retry_op = 0, read = 0;
 
 again:
 	dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
@@ -815,7 +823,7 @@ again:
 		want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
 	else
 		want = CEPH_CAP_FILE_CACHE;
-	ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
+	ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
 	if (ret < 0)
 		return ret;
 
@@ -827,8 +835,12 @@ again:
 		     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
 		     ceph_cap_string(got));
 
-		/* hmm, this isn't really async... */
-		ret = ceph_sync_read(iocb, to, &checkeof);
+		if (ci->i_inline_version == CEPH_INLINE_NONE) {
+			/* hmm, this isn't really async... */
+			ret = ceph_sync_read(iocb, to, &retry_op);
+		} else {
+			retry_op = READ_INLINE;
+		}
 	} else {
 		dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
 		     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
@@ -838,13 +850,55 @@ again:
 	}
 	dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
 	     inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
+	if (pinned_page) {
+		page_cache_release(pinned_page);
+		pinned_page = NULL;
+	}
 	ceph_put_cap_refs(ci, got);
+	if (retry_op && ret >= 0) {
+		int statret;
+		struct page *page = NULL;
+		loff_t i_size;
+		if (retry_op == READ_INLINE) {
+			page = __page_cache_alloc(GFP_NOFS);
+			if (!page)
+				return -ENOMEM;
+		}
 
-	if (checkeof && ret >= 0) {
-		int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
+		statret = __ceph_do_getattr(inode, page,
+					    CEPH_STAT_CAP_INLINE_DATA, !!page);
+		if (statret < 0) {
+			 __free_page(page);
+			if (statret == -ENODATA) {
+				BUG_ON(retry_op != READ_INLINE);
+				goto again;
+			}
+			return statret;
+		}
+
+		i_size = i_size_read(inode);
+		if (retry_op == READ_INLINE) {
+			/* does not support inline data > PAGE_SIZE */
+			if (i_size > PAGE_CACHE_SIZE) {
+				ret = -EIO;
+			} else if (iocb->ki_pos < i_size) {
+				loff_t end = min_t(loff_t, i_size,
+						   iocb->ki_pos + len);
+				if (statret < end)
+					zero_user_segment(page, statret, end);
+				ret = copy_page_to_iter(page,
+						iocb->ki_pos & ~PAGE_MASK,
+						end - iocb->ki_pos, to);
+				iocb->ki_pos += ret;
+			} else {
+				ret = 0;
+			}
+			__free_pages(page, 0);
+			return ret;
+		}
 
 		/* hit EOF or hole? */
-		if (statret == 0 && iocb->ki_pos < inode->i_size &&
+		if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
 			ret < len) {
 			dout("sync_read hit hole, ppos %lld < size %lld"
 			     ", reading more\n", iocb->ki_pos,
@@ -852,7 +906,7 @@ again:
 
 			read += ret;
 			len -= ret;
-			checkeof = 0;
+			retry_op = 0;
 			goto again;
 		}
 	}
@@ -909,6 +963,12 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	if (err)
 		goto out;
 
+	if (ci->i_inline_version != CEPH_INLINE_NONE) {
+		err = ceph_uninline_data(file, NULL);
+		if (err < 0)
+			goto out;
+	}
+
 retry_snap:
 	if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
 		err = -ENOSPC;
@@ -922,7 +982,8 @@ retry_snap:
 	else
 		want = CEPH_CAP_FILE_BUFFER;
 	got = 0;
-	err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count);
+	err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
+			    &got, NULL);
 	if (err < 0)
 		goto out;
 
@@ -969,6 +1030,7 @@ retry_snap:
 	if (written >= 0) {
 		int dirty;
 		spin_lock(&ci->i_ceph_lock);
+		ci->i_inline_version = CEPH_INLINE_NONE;
 		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
 		spin_unlock(&ci->i_ceph_lock);
 		if (dirty)
@@ -1111,7 +1173,7 @@ static int ceph_zero_partial_object(struct inode *inode,
 	req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
 					ceph_vino(inode),
 					offset, length,
-					1, op,
+					0, 1, op,
 					CEPH_OSD_FLAG_WRITE |
 					CEPH_OSD_FLAG_ONDISK,
 					NULL, 0, 0, false);
@@ -1214,6 +1276,12 @@ static long ceph_fallocate(struct file *file, int mode,
 		goto unlock;
 	}
 
+	if (ci->i_inline_version != CEPH_INLINE_NONE) {
+		ret = ceph_uninline_data(file, NULL);
+		if (ret < 0)
+			goto unlock;
+	}
+
 	size = i_size_read(inode);
 	if (!(mode & FALLOC_FL_KEEP_SIZE))
 		endoff = offset + length;
@@ -1223,7 +1291,7 @@ static long ceph_fallocate(struct file *file, int mode,
 	else
 		want = CEPH_CAP_FILE_BUFFER;
 
-	ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
+	ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
 	if (ret < 0)
 		goto unlock;
 
@@ -1240,6 +1308,7 @@ static long ceph_fallocate(struct file *file, int mode,
 
 	if (!ret) {
 		spin_lock(&ci->i_ceph_lock);
+		ci->i_inline_version = CEPH_INLINE_NONE;
 		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
 		spin_unlock(&ci->i_ceph_lock);
 		if (dirty)
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index a5593d5..f61a741 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -387,8 +387,10 @@ struct inode *ceph_alloc_inode(struct super_block *sb)
 	spin_lock_init(&ci->i_ceph_lock);
 
 	ci->i_version = 0;
+	ci->i_inline_version = 0;
 	ci->i_time_warp_seq = 0;
 	ci->i_ceph_flags = 0;
+	ci->i_ordered_count = 0;
 	atomic_set(&ci->i_release_count, 1);
 	atomic_set(&ci->i_complete_count, 0);
 	ci->i_symlink = NULL;
@@ -657,7 +659,7 @@ void ceph_fill_file_time(struct inode *inode, int issued,
  * Populate an inode based on info from mds.  May be called on new or
  * existing inodes.
  */
-static int fill_inode(struct inode *inode,
+static int fill_inode(struct inode *inode, struct page *locked_page,
 		      struct ceph_mds_reply_info_in *iinfo,
 		      struct ceph_mds_reply_dirfrag *dirinfo,
 		      struct ceph_mds_session *session,
@@ -675,6 +677,7 @@ static int fill_inode(struct inode *inode,
 	bool wake = false;
 	bool queue_trunc = false;
 	bool new_version = false;
+	bool fill_inline = false;
 
 	dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 	     inode, ceph_vinop(inode), le64_to_cpu(info->version),
@@ -845,7 +848,8 @@ static int fill_inode(struct inode *inode,
 	    (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 	    !__ceph_dir_is_complete(ci)) {
 		dout(" marking %p complete (empty)\n", inode);
-		__ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count));
+		__ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count),
+					ci->i_ordered_count);
 	}
 
 	/* were we issued a capability? */
@@ -873,8 +877,23 @@ static int fill_inode(struct inode *inode,
 			   ceph_vinop(inode));
 		__ceph_get_fmode(ci, cap_fmode);
 	}
+
+	if (iinfo->inline_version > 0 &&
+	    iinfo->inline_version >= ci->i_inline_version) {
+		int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
+		ci->i_inline_version = iinfo->inline_version;
+		if (ci->i_inline_version != CEPH_INLINE_NONE &&
+		    (locked_page ||
+		     (le32_to_cpu(info->cap.caps) & cache_caps)))
+			fill_inline = true;
+	}
+
 	spin_unlock(&ci->i_ceph_lock);
 
+	if (fill_inline)
+		ceph_fill_inline_data(inode, locked_page,
+				      iinfo->inline_data, iinfo->inline_len);
+
 	if (wake)
 		wake_up_all(&ci->i_cap_wq);
 
@@ -1062,7 +1081,8 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 		struct inode *dir = req->r_locked_dir;
 
 		if (dir) {
-			err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
+			err = fill_inode(dir, NULL,
+					 &rinfo->diri, rinfo->dirfrag,
 					 session, req->r_request_started, -1,
 					 &req->r_caps_reservation);
 			if (err < 0)
@@ -1132,7 +1152,7 @@ retry_lookup:
 		}
 		req->r_target_inode = in;
 
-		err = fill_inode(in, &rinfo->targeti, NULL,
+		err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
 				session, req->r_request_started,
 				(!req->r_aborted && rinfo->head->result == 0) ?
 				req->r_fmode : -1,
@@ -1204,8 +1224,8 @@ retry_lookup:
 			ceph_invalidate_dentry_lease(dn);
 
 			/* d_move screws up sibling dentries' offsets */
-			ceph_dir_clear_complete(dir);
-			ceph_dir_clear_complete(olddir);
+			ceph_dir_clear_ordered(dir);
+			ceph_dir_clear_ordered(olddir);
 
 			dout("dn %p gets new offset %lld\n", req->r_old_dentry,
 			     ceph_dentry(req->r_old_dentry)->offset);
@@ -1217,6 +1237,7 @@ retry_lookup:
 		if (!rinfo->head->is_target) {
 			dout("fill_trace null dentry\n");
 			if (dn->d_inode) {
+				ceph_dir_clear_ordered(dir);
 				dout("d_delete %p\n", dn);
 				d_delete(dn);
 			} else {
@@ -1233,7 +1254,7 @@ retry_lookup:
 
 		/* attach proper inode */
 		if (!dn->d_inode) {
-			ceph_dir_clear_complete(dir);
+			ceph_dir_clear_ordered(dir);
 			ihold(in);
 			dn = splice_dentry(dn, in, &have_lease);
 			if (IS_ERR(dn)) {
@@ -1263,7 +1284,7 @@ retry_lookup:
 		BUG_ON(!dir);
 		BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
 		dout(" linking snapped dir %p to dn %p\n", in, dn);
-		ceph_dir_clear_complete(dir);
+		ceph_dir_clear_ordered(dir);
 		ihold(in);
 		dn = splice_dentry(dn, in, NULL);
 		if (IS_ERR(dn)) {
@@ -1300,7 +1321,7 @@ static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
 			dout("new_inode badness got %d\n", err);
 			continue;
 		}
-		rc = fill_inode(in, &rinfo->dir_in[i], NULL, session,
+		rc = fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
 				req->r_request_started, -1,
 				&req->r_caps_reservation);
 		if (rc < 0) {
@@ -1416,7 +1437,7 @@ retry_lookup:
 			}
 		}
 
-		if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
+		if (fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
 			       req->r_request_started, -1,
 			       &req->r_caps_reservation) < 0) {
 			pr_err("fill_inode badness on %p\n", in);
@@ -1899,7 +1920,8 @@ out_put:
  * Verify that we have a lease on the given mask.  If not,
  * do a getattr against an mds.
  */
-int ceph_do_getattr(struct inode *inode, int mask, bool force)
+int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
+		      int mask, bool force)
 {
 	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
 	struct ceph_mds_client *mdsc = fsc->mdsc;
@@ -1911,7 +1933,8 @@ int ceph_do_getattr(struct inode *inode, int mask, bool force)
 		return 0;
 	}
 
-	dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
+	dout("do_getattr inode %p mask %s mode 0%o\n",
+	     inode, ceph_cap_string(mask), inode->i_mode);
 	if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
 		return 0;
 
@@ -1922,7 +1945,19 @@ int ceph_do_getattr(struct inode *inode, int mask, bool force)
 	ihold(inode);
 	req->r_num_caps = 1;
 	req->r_args.getattr.mask = cpu_to_le32(mask);
+	req->r_locked_page = locked_page;
 	err = ceph_mdsc_do_request(mdsc, NULL, req);
+	if (locked_page && err == 0) {
+		u64 inline_version = req->r_reply_info.targeti.inline_version;
+		if (inline_version == 0) {
+			/* the reply is supposed to contain inline data */
+			err = -EINVAL;
+		} else if (inline_version == CEPH_INLINE_NONE) {
+			err = -ENODATA;
+		} else {
+			err = req->r_reply_info.targeti.inline_len;
+		}
+	}
 	ceph_mdsc_put_request(req);
 	dout("do_getattr result=%d\n", err);
 	return err;
diff --git a/fs/ceph/locks.c b/fs/ceph/locks.c
index fbc39c4..c35c5c6 100644
--- a/fs/ceph/locks.c
+++ b/fs/ceph/locks.c
@@ -9,6 +9,8 @@
 #include <linux/ceph/pagelist.h>
 
 static u64 lock_secret;
+static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc,
+                                         struct ceph_mds_request *req);
 
 static inline u64 secure_addr(void *addr)
 {
@@ -40,6 +42,9 @@ static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
 	u64 length = 0;
 	u64 owner;
 
+	if (operation != CEPH_MDS_OP_SETFILELOCK || cmd == CEPH_LOCK_UNLOCK)
+		wait = 0;
+
 	req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS);
 	if (IS_ERR(req))
 		return PTR_ERR(req);
@@ -68,6 +73,9 @@ static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
 	req->r_args.filelock_change.length = cpu_to_le64(length);
 	req->r_args.filelock_change.wait = wait;
 
+	if (wait)
+		req->r_wait_for_completion = ceph_lock_wait_for_completion;
+
 	err = ceph_mdsc_do_request(mdsc, inode, req);
 
 	if (operation == CEPH_MDS_OP_GETFILELOCK) {
@@ -96,6 +104,52 @@ static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
 	return err;
 }
 
+static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc,
+                                         struct ceph_mds_request *req)
+{
+	struct ceph_mds_request *intr_req;
+	struct inode *inode = req->r_inode;
+	int err, lock_type;
+
+	BUG_ON(req->r_op != CEPH_MDS_OP_SETFILELOCK);
+	if (req->r_args.filelock_change.rule == CEPH_LOCK_FCNTL)
+		lock_type = CEPH_LOCK_FCNTL_INTR;
+	else if (req->r_args.filelock_change.rule == CEPH_LOCK_FLOCK)
+		lock_type = CEPH_LOCK_FLOCK_INTR;
+	else
+		BUG_ON(1);
+	BUG_ON(req->r_args.filelock_change.type == CEPH_LOCK_UNLOCK);
+
+	err = wait_for_completion_interruptible(&req->r_completion);
+	if (!err)
+		return 0;
+
+	dout("ceph_lock_wait_for_completion: request %llu was interrupted\n",
+	     req->r_tid);
+
+	intr_req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETFILELOCK,
+					    USE_AUTH_MDS);
+	if (IS_ERR(intr_req))
+		return PTR_ERR(intr_req);
+
+	intr_req->r_inode = inode;
+	ihold(inode);
+	intr_req->r_num_caps = 1;
+
+	intr_req->r_args.filelock_change = req->r_args.filelock_change;
+	intr_req->r_args.filelock_change.rule = lock_type;
+	intr_req->r_args.filelock_change.type = CEPH_LOCK_UNLOCK;
+
+	err = ceph_mdsc_do_request(mdsc, inode, intr_req);
+	ceph_mdsc_put_request(intr_req);
+
+	if (err && err != -ERESTARTSYS)
+		return err;
+
+	wait_for_completion(&req->r_completion);
+	return 0;
+}
+
 /**
  * Attempt to set an fcntl lock.
  * For now, this just goes away to the server. Later it may be more awesome.
@@ -143,11 +197,6 @@ int ceph_lock(struct file *file, int cmd, struct file_lock *fl)
 				     err);
 			}
 		}
-
-	} else if (err == -ERESTARTSYS) {
-		dout("undoing lock\n");
-		ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
-				  CEPH_LOCK_UNLOCK, 0, fl);
 	}
 	return err;
 }
@@ -186,11 +235,6 @@ int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
 					  file, CEPH_LOCK_UNLOCK, 0, fl);
 			dout("got %d on flock_lock_file_wait, undid lock", err);
 		}
-	} else if (err == -ERESTARTSYS) {
-		dout("undoing lock\n");
-		ceph_lock_message(CEPH_LOCK_FLOCK,
-				  CEPH_MDS_OP_SETFILELOCK,
-				  file, CEPH_LOCK_UNLOCK, 0, fl);
 	}
 	return err;
 }
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index a92d3f5..d2171f4 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -89,6 +89,16 @@ static int parse_reply_info_in(void **p, void *end,
 	ceph_decode_need(p, end, info->xattr_len, bad);
 	info->xattr_data = *p;
 	*p += info->xattr_len;
+
+	if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
+		ceph_decode_64_safe(p, end, info->inline_version, bad);
+		ceph_decode_32_safe(p, end, info->inline_len, bad);
+		ceph_decode_need(p, end, info->inline_len, bad);
+		info->inline_data = *p;
+		*p += info->inline_len;
+	} else
+		info->inline_version = CEPH_INLINE_NONE;
+
 	return 0;
 bad:
 	return err;
@@ -524,8 +534,7 @@ void ceph_mdsc_release_request(struct kref *kref)
 	}
 	if (req->r_locked_dir)
 		ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
-	if (req->r_target_inode)
-		iput(req->r_target_inode);
+	iput(req->r_target_inode);
 	if (req->r_dentry)
 		dput(req->r_dentry);
 	if (req->r_old_dentry)
@@ -861,8 +870,11 @@ static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u6
 	/*
 	 * Serialize client metadata into waiting buffer space, using
 	 * the format that userspace expects for map<string, string>
+	 *
+	 * ClientSession messages with metadata are v2
 	 */
-	msg->hdr.version = 2;  /* ClientSession messages with metadata are v2 */
+	msg->hdr.version = cpu_to_le16(2);
+	msg->hdr.compat_version = cpu_to_le16(1);
 
 	/* The write pointer, following the session_head structure */
 	p = msg->front.iov_base + sizeof(*h);
@@ -1066,8 +1078,7 @@ out:
 	session->s_cap_iterator = NULL;
 	spin_unlock(&session->s_cap_lock);
 
-	if (last_inode)
-		iput(last_inode);
+	iput(last_inode);
 	if (old_cap)
 		ceph_put_cap(session->s_mdsc, old_cap);
 
@@ -1874,7 +1885,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
 		goto out_free2;
 	}
 
-	msg->hdr.version = 2;
+	msg->hdr.version = cpu_to_le16(2);
 	msg->hdr.tid = cpu_to_le64(req->r_tid);
 
 	head = msg->front.iov_base;
@@ -2208,6 +2219,8 @@ int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
 			&req->r_completion, req->r_timeout);
 		if (err == 0)
 			err = -EIO;
+	} else if (req->r_wait_for_completion) {
+		err = req->r_wait_for_completion(mdsc, req);
 	} else {
 		err = wait_for_completion_killable(&req->r_completion);
 	}
@@ -3744,6 +3757,20 @@ static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
 	return msg;
 }
 
+static int sign_message(struct ceph_connection *con, struct ceph_msg *msg)
+{
+       struct ceph_mds_session *s = con->private;
+       struct ceph_auth_handshake *auth = &s->s_auth;
+       return ceph_auth_sign_message(auth, msg);
+}
+
+static int check_message_signature(struct ceph_connection *con, struct ceph_msg *msg)
+{
+       struct ceph_mds_session *s = con->private;
+       struct ceph_auth_handshake *auth = &s->s_auth;
+       return ceph_auth_check_message_signature(auth, msg);
+}
+
 static const struct ceph_connection_operations mds_con_ops = {
 	.get = con_get,
 	.put = con_put,
@@ -3753,6 +3780,8 @@ static const struct ceph_connection_operations mds_con_ops = {
 	.invalidate_authorizer = invalidate_authorizer,
 	.peer_reset = peer_reset,
 	.alloc_msg = mds_alloc_msg,
+	.sign_message = sign_message,
+	.check_message_signature = check_message_signature,
 };
 
 /* eof */
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 3288359..e2817d0 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -41,6 +41,9 @@ struct ceph_mds_reply_info_in {
 	char *symlink;
 	u32 xattr_len;
 	char *xattr_data;
+	u64 inline_version;
+	u32 inline_len;
+	char *inline_data;
 };
 
 /*
@@ -166,6 +169,11 @@ struct ceph_mds_client;
  */
 typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
 					     struct ceph_mds_request *req);
+/*
+ * wait for request completion callback
+ */
+typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
+						 struct ceph_mds_request *req);
 
 /*
  * an in-flight mds request
@@ -215,6 +223,7 @@ struct ceph_mds_request {
 	int r_request_release_offset;
 	struct ceph_msg  *r_reply;
 	struct ceph_mds_reply_info_parsed r_reply_info;
+	struct page *r_locked_page;
 	int r_err;
 	bool r_aborted;
 
@@ -239,6 +248,7 @@ struct ceph_mds_request {
 	struct completion r_completion;
 	struct completion r_safe_completion;
 	ceph_mds_request_callback_t r_callback;
+	ceph_mds_request_wait_callback_t r_wait_for_completion;
 	struct list_head  r_unsafe_item;  /* per-session unsafe list item */
 	bool		  r_got_unsafe, r_got_safe, r_got_result;
 
diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index f01645a..ce35fbd 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -288,6 +288,9 @@ static int cmpu64_rev(const void *a, const void *b)
 	return 0;
 }
 
+
+static struct ceph_snap_context *empty_snapc;
+
 /*
  * build the snap context for a given realm.
  */
@@ -328,6 +331,12 @@ static int build_snap_context(struct ceph_snap_realm *realm)
 		return 0;
 	}
 
+	if (num == 0 && realm->seq == empty_snapc->seq) {
+		ceph_get_snap_context(empty_snapc);
+		snapc = empty_snapc;
+		goto done;
+	}
+
 	/* alloc new snap context */
 	err = -ENOMEM;
 	if (num > (SIZE_MAX - sizeof(*snapc)) / sizeof(u64))
@@ -365,8 +374,8 @@ static int build_snap_context(struct ceph_snap_realm *realm)
 	     realm->ino, realm, snapc, snapc->seq,
 	     (unsigned int) snapc->num_snaps);
 
-	if (realm->cached_context)
-		ceph_put_snap_context(realm->cached_context);
+done:
+	ceph_put_snap_context(realm->cached_context);
 	realm->cached_context = snapc;
 	return 0;
 
@@ -466,6 +475,9 @@ 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_snap_realm->cached_context == empty_snapc) {
+		dout("queue_cap_snap %p empty snapc\n", inode);
+		kfree(capsnap);
 	} else if (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;
@@ -504,6 +516,8 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci)
 			capsnap->xattr_version = 0;
 		}
 
+		capsnap->inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
+
 		/* dirty page count moved from _head to this cap_snap;
 		   all subsequent writes page dirties occur _after_ this
 		   snapshot. */
@@ -590,15 +604,13 @@ static void queue_realm_cap_snaps(struct ceph_snap_realm *realm)
 		if (!inode)
 			continue;
 		spin_unlock(&realm->inodes_with_caps_lock);
-		if (lastinode)
-			iput(lastinode);
+		iput(lastinode);
 		lastinode = inode;
 		ceph_queue_cap_snap(ci);
 		spin_lock(&realm->inodes_with_caps_lock);
 	}
 	spin_unlock(&realm->inodes_with_caps_lock);
-	if (lastinode)
-		iput(lastinode);
+	iput(lastinode);
 
 	list_for_each_entry(child, &realm->children, child_item) {
 		dout("queue_realm_cap_snaps %p %llx queue child %p %llx\n",
@@ -928,5 +940,16 @@ out:
 	return;
 }
 
+int __init ceph_snap_init(void)
+{
+	empty_snapc = ceph_create_snap_context(0, GFP_NOFS);
+	if (!empty_snapc)
+		return -ENOMEM;
+	empty_snapc->seq = 1;
+	return 0;
+}
 
-
+void ceph_snap_exit(void)
+{
+	ceph_put_snap_context(empty_snapc);
+}
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index f6e1237..50f06cd 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -515,7 +515,8 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 	struct ceph_fs_client *fsc;
 	const u64 supported_features =
 		CEPH_FEATURE_FLOCK |
-		CEPH_FEATURE_DIRLAYOUTHASH;
+		CEPH_FEATURE_DIRLAYOUTHASH |
+		CEPH_FEATURE_MDS_INLINE_DATA;
 	const u64 required_features = 0;
 	int page_count;
 	size_t size;
@@ -1017,9 +1018,6 @@ static struct file_system_type ceph_fs_type = {
 };
 MODULE_ALIAS_FS("ceph");
 
-#define _STRINGIFY(x) #x
-#define STRINGIFY(x) _STRINGIFY(x)
-
 static int __init init_ceph(void)
 {
 	int ret = init_caches();
@@ -1028,15 +1026,20 @@ static int __init init_ceph(void)
 
 	ceph_flock_init();
 	ceph_xattr_init();
+	ret = ceph_snap_init();
+	if (ret)
+		goto out_xattr;
 	ret = register_filesystem(&ceph_fs_type);
 	if (ret)
-		goto out_icache;
+		goto out_snap;
 
 	pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
 
 	return 0;
 
-out_icache:
+out_snap:
+	ceph_snap_exit();
+out_xattr:
 	ceph_xattr_exit();
 	destroy_caches();
 out:
@@ -1047,6 +1050,7 @@ static void __exit exit_ceph(void)
 {
 	dout("exit_ceph\n");
 	unregister_filesystem(&ceph_fs_type);
+	ceph_snap_exit();
 	ceph_xattr_exit();
 	destroy_caches();
 }
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index b82f507..e1aa32d 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -161,6 +161,7 @@ struct ceph_cap_snap {
 	u64 time_warp_seq;
 	int writing;   /* a sync write is still in progress */
 	int dirty_pages;     /* dirty pages awaiting writeback */
+	bool inline_data;
 };
 
 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
@@ -253,9 +254,11 @@ struct ceph_inode_info {
 	spinlock_t i_ceph_lock;
 
 	u64 i_version;
+	u64 i_inline_version;
 	u32 i_time_warp_seq;
 
 	unsigned i_ceph_flags;
+	int i_ordered_count;
 	atomic_t i_release_count;
 	atomic_t i_complete_count;
 
@@ -434,14 +437,19 @@ static inline struct inode *ceph_find_inode(struct super_block *sb,
 /*
  * Ceph inode.
  */
-#define CEPH_I_NODELAY   4  /* do not delay cap release */
-#define CEPH_I_FLUSH     8  /* do not delay flush of dirty metadata */
-#define CEPH_I_NOFLUSH  16  /* do not flush dirty caps */
+#define CEPH_I_DIR_ORDERED	1  /* dentries in dir are ordered */
+#define CEPH_I_NODELAY		4  /* do not delay cap release */
+#define CEPH_I_FLUSH		8  /* do not delay flush of dirty metadata */
+#define CEPH_I_NOFLUSH		16 /* do not flush dirty caps */
 
 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
-					   int release_count)
+					   int release_count, int ordered_count)
 {
 	atomic_set(&ci->i_complete_count, release_count);
+	if (ci->i_ordered_count == ordered_count)
+		ci->i_ceph_flags |= CEPH_I_DIR_ORDERED;
+	else
+		ci->i_ceph_flags &= ~CEPH_I_DIR_ORDERED;
 }
 
 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci)
@@ -455,16 +463,35 @@ static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci)
 		atomic_read(&ci->i_release_count);
 }
 
+static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci)
+{
+	return __ceph_dir_is_complete(ci) &&
+		(ci->i_ceph_flags & CEPH_I_DIR_ORDERED);
+}
+
 static inline void ceph_dir_clear_complete(struct inode *inode)
 {
 	__ceph_dir_clear_complete(ceph_inode(inode));
 }
 
-static inline bool ceph_dir_is_complete(struct inode *inode)
+static inline void ceph_dir_clear_ordered(struct inode *inode)
 {
-	return __ceph_dir_is_complete(ceph_inode(inode));
+	struct ceph_inode_info *ci = ceph_inode(inode);
+	spin_lock(&ci->i_ceph_lock);
+	ci->i_ordered_count++;
+	ci->i_ceph_flags &= ~CEPH_I_DIR_ORDERED;
+	spin_unlock(&ci->i_ceph_lock);
 }
 
+static inline bool ceph_dir_is_complete_ordered(struct inode *inode)
+{
+	struct ceph_inode_info *ci = ceph_inode(inode);
+	bool ret;
+	spin_lock(&ci->i_ceph_lock);
+	ret = __ceph_dir_is_complete_ordered(ci);
+	spin_unlock(&ci->i_ceph_lock);
+	return ret;
+}
 
 /* find a specific frag @f */
 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
@@ -580,6 +607,7 @@ struct ceph_file_info {
 	char *last_name;       /* last entry in previous chunk */
 	struct dentry *dentry; /* next dentry (for dcache readdir) */
 	int dir_release_count;
+	int dir_ordered_count;
 
 	/* used for -o dirstat read() on directory thing */
 	char *dir_info;
@@ -673,6 +701,8 @@ extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
 				  struct ceph_cap_snap *capsnap);
 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
+extern int ceph_snap_init(void);
+extern void ceph_snap_exit(void);
 
 /*
  * a cap_snap is "pending" if it is still awaiting an in-progress
@@ -715,7 +745,12 @@ extern void ceph_queue_vmtruncate(struct inode *inode);
 extern void ceph_queue_invalidate(struct inode *inode);
 extern void ceph_queue_writeback(struct inode *inode);
 
-extern int ceph_do_getattr(struct inode *inode, int mask, bool force);
+extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
+			     int mask, bool force);
+static inline int ceph_do_getattr(struct inode *inode, int mask, bool force)
+{
+	return __ceph_do_getattr(inode, NULL, mask, force);
+}
 extern int ceph_permission(struct inode *inode, int mask);
 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
@@ -830,7 +865,7 @@ extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
 				      int mds, int drop, int unless);
 
 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
-			 int *got, loff_t endoff);
+			 loff_t endoff, int *got, struct page **pinned_page);
 
 /* for counting open files by mode */
 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
@@ -852,7 +887,9 @@ extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 			    struct file *file, unsigned flags, umode_t mode,
 			    int *opened);
 extern int ceph_release(struct inode *inode, struct file *filp);
-
+extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
+				  char *data, size_t len);
+int ceph_uninline_data(struct file *filp, struct page *locked_page);
 /* dir.c */
 extern const struct file_operations ceph_dir_fops;
 extern const struct inode_operations ceph_dir_iops;
diff --git a/fs/ceph/super.h.rej b/fs/ceph/super.h.rej
new file mode 100644
index 0000000..88fe3df
--- /dev/null
+++ b/fs/ceph/super.h.rej
@@ -0,0 +1,10 @@
+--- fs/ceph/super.h
++++ fs/ceph/super.h
+@@ -254,6 +255,7 @@
+	spinlock_t i_ceph_lock;
+
+	u64 i_version;
++	u64 i_inline_version;
+	u32 i_time_warp_seq;
+
+	unsigned i_ceph_flags;
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 678b0d2..5a492ca 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -854,7 +854,7 @@ static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
 	struct ceph_pagelist *pagelist = NULL;
 	int err;
 
-	if (value) {
+	if (size > 0) {
 		/* copy value into pagelist */
 		pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
 		if (!pagelist)
@@ -864,7 +864,7 @@ static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
 		err = ceph_pagelist_append(pagelist, value, size);
 		if (err)
 			goto out;
-	} else {
+	} else if (!value) {
 		flags |= CEPH_XATTR_REMOVE;
 	}
 
@@ -1001,6 +1001,9 @@ int ceph_setxattr(struct dentry *dentry, const char *name,
 	if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
 		return generic_setxattr(dentry, name, value, size, flags);
 
+	if (size == 0)
+		value = "";  /* empty EA, do not remove */
+
 	return __ceph_setxattr(dentry, name, value, size, flags);
 }