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

Pull Ceph changes from Alex Elder:
 "This is a big pull.

  Most of it is culmination of Alex's work to implement RBD image
  layering, which is now complete (yay!).

  There is also some work from Yan to fix i_mutex behavior surrounding
  writes in cephfs, a sync write fix, a fix for RBD images that get
  resized while they are mapped, and a few patches from me that resolve
  annoying auth warnings and fix several bugs in the ceph auth code."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (254 commits)
  rbd: fix image request leak on parent read
  libceph: use slab cache for osd client requests
  libceph: allocate ceph message data with a slab allocator
  libceph: allocate ceph messages with a slab allocator
  rbd: allocate image object names with a slab allocator
  rbd: allocate object requests with a slab allocator
  rbd: allocate name separate from obj_request
  rbd: allocate image requests with a slab allocator
  rbd: use binary search for snapshot lookup
  rbd: clear EXISTS flag if mapped snapshot disappears
  rbd: kill off the snapshot list
  rbd: define rbd_snap_size() and rbd_snap_features()
  rbd: use snap_id not index to look up snap info
  rbd: look up snapshot name in names buffer
  rbd: drop obj_request->version
  rbd: drop rbd_obj_method_sync() version parameter
  rbd: more version parameter removal
  rbd: get rid of some version parameters
  rbd: stop tracking header object version
  rbd: snap names are pointer to constant data
  ...

11 files changed, 398 insertions, 389 deletions

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index a60ea977af6f..3e68ac101040 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -236,15 +236,21 @@ static int ceph_readpage(struct file *filp, struct page *page)
 static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg)
 {
 	struct inode *inode = req->r_inode;
+	struct ceph_osd_data *osd_data;
 	int rc = req->r_result;
 	int bytes = le32_to_cpu(msg->hdr.data_len);
+	int num_pages;
 	int i;
 
 	dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes);
 
 	/* unlock all pages, zeroing any data we didn't read */
-	for (i = 0; i < req->r_num_pages; i++, bytes -= PAGE_CACHE_SIZE) {
-		struct page *page = req->r_pages[i];
+	osd_data = osd_req_op_extent_osd_data(req, 0);
+	BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
+	num_pages = calc_pages_for((u64)osd_data->alignment,
+					(u64)osd_data->length);
+	for (i = 0; i < num_pages; i++) {
+		struct page *page = osd_data->pages[i];
 
 		if (bytes < (int)PAGE_CACHE_SIZE) {
 			/* zero (remainder of) page */
@@ -257,8 +263,9 @@ static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg)
 		SetPageUptodate(page);
 		unlock_page(page);
 		page_cache_release(page);
+		bytes -= PAGE_CACHE_SIZE;
 	}
-	kfree(req->r_pages);
+	kfree(osd_data->pages);
 }
 
 static void ceph_unlock_page_vector(struct page **pages, int num_pages)
@@ -279,6 +286,7 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
 		&ceph_inode_to_client(inode)->client->osdc;
 	struct ceph_inode_info *ci = ceph_inode(inode);
 	struct page *page = list_entry(page_list->prev, struct page, lru);
+	struct ceph_vino vino;
 	struct ceph_osd_request *req;
 	u64 off;
 	u64 len;
@@ -303,18 +311,17 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
 	len = nr_pages << PAGE_CACHE_SHIFT;
 	dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages,
 	     off, len);
-
-	req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode),
-				    off, &len,
-				    CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
-				    NULL, 0,
+	vino = ceph_vino(inode);
+	req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len,
+				    1, CEPH_OSD_OP_READ,
+				    CEPH_OSD_FLAG_READ, NULL,
 				    ci->i_truncate_seq, ci->i_truncate_size,
-				    NULL, false, 0);
+				    false);
 	if (IS_ERR(req))
 		return PTR_ERR(req);
 
 	/* build page vector */
-	nr_pages = len >> PAGE_CACHE_SHIFT;
+	nr_pages = calc_pages_for(0, len);
 	pages = kmalloc(sizeof(*pages) * nr_pages, GFP_NOFS);
 	ret = -ENOMEM;
 	if (!pages)
@@ -336,11 +343,12 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
 		}
 		pages[i] = page;
 	}
-	req->r_pages = pages;
-	req->r_num_pages = nr_pages;
+	osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
 	req->r_callback = finish_read;
 	req->r_inode = inode;
 
+	ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
+
 	dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len);
 	ret = ceph_osdc_start_request(osdc, req, false);
 	if (ret < 0)
@@ -373,7 +381,8 @@ static int ceph_readpages(struct file *file, struct address_space *mapping,
 		max = (fsc->mount_options->rsize + PAGE_CACHE_SIZE - 1)
 			>> PAGE_SHIFT;
 
-	dout("readpages %p file %p nr_pages %d max %d\n", inode, file, nr_pages,
+	dout("readpages %p file %p nr_pages %d max %d\n", inode,
+		file, nr_pages,
 	     max);
 	while (!list_empty(page_list)) {
 		rc = start_read(inode, page_list, max);
@@ -548,17 +557,23 @@ static void writepages_finish(struct ceph_osd_request *req,
 {
 	struct inode *inode = req->r_inode;
 	struct ceph_inode_info *ci = ceph_inode(inode);
+	struct ceph_osd_data *osd_data;
 	unsigned wrote;
 	struct page *page;
+	int num_pages;
 	int i;
 	struct ceph_snap_context *snapc = req->r_snapc;
 	struct address_space *mapping = inode->i_mapping;
 	int rc = req->r_result;
-	u64 bytes = le64_to_cpu(req->r_request_ops[0].extent.length);
+	u64 bytes = req->r_ops[0].extent.length;
 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
 	long writeback_stat;
 	unsigned issued = ceph_caps_issued(ci);
 
+	osd_data = osd_req_op_extent_osd_data(req, 0);
+	BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
+	num_pages = calc_pages_for((u64)osd_data->alignment,
+					(u64)osd_data->length);
 	if (rc >= 0) {
 		/*
 		 * Assume we wrote the pages we originally sent.  The
@@ -566,7 +581,7 @@ static void writepages_finish(struct ceph_osd_request *req,
 		 * raced with a truncation and was adjusted at the osd,
 		 * so don't believe the reply.
 		 */
-		wrote = req->r_num_pages;
+		wrote = num_pages;
 	} else {
 		wrote = 0;
 		mapping_set_error(mapping, rc);
@@ -575,8 +590,8 @@ static void writepages_finish(struct ceph_osd_request *req,
 	     inode, rc, bytes, wrote);
 
 	/* clean all pages */
-	for (i = 0; i < req->r_num_pages; i++) {
-		page = req->r_pages[i];
+	for (i = 0; i < num_pages; i++) {
+		page = osd_data->pages[i];
 		BUG_ON(!page);
 		WARN_ON(!PageUptodate(page));
 
@@ -605,32 +620,34 @@ static void writepages_finish(struct ceph_osd_request *req,
 		unlock_page(page);
 	}
 	dout("%p wrote+cleaned %d pages\n", inode, wrote);
-	ceph_put_wrbuffer_cap_refs(ci, req->r_num_pages, snapc);
+	ceph_put_wrbuffer_cap_refs(ci, num_pages, snapc);
 
-	ceph_release_pages(req->r_pages, req->r_num_pages);
-	if (req->r_pages_from_pool)
-		mempool_free(req->r_pages,
+	ceph_release_pages(osd_data->pages, num_pages);
+	if (osd_data->pages_from_pool)
+		mempool_free(osd_data->pages,
 			     ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool);
 	else
-		kfree(req->r_pages);
+		kfree(osd_data->pages);
 	ceph_osdc_put_request(req);
 }
 
-/*
- * allocate a page vec, either directly, or if necessary, via a the
- * mempool.  we avoid the mempool if we can because req->r_num_pages
- * may be less than the maximum write size.
- */
-static void alloc_page_vec(struct ceph_fs_client *fsc,
-			   struct ceph_osd_request *req)
+static struct ceph_osd_request *
+ceph_writepages_osd_request(struct inode *inode, u64 offset, u64 *len,
+				struct ceph_snap_context *snapc, int num_ops)
 {
-	req->r_pages = kmalloc(sizeof(struct page *) * req->r_num_pages,
-			       GFP_NOFS);
-	if (!req->r_pages) {
-		req->r_pages = mempool_alloc(fsc->wb_pagevec_pool, GFP_NOFS);
-		req->r_pages_from_pool = 1;
-		WARN_ON(!req->r_pages);
-	}
+	struct ceph_fs_client *fsc;
+	struct ceph_inode_info *ci;
+	struct ceph_vino vino;
+
+	fsc = ceph_inode_to_client(inode);
+	ci = ceph_inode(inode);
+	vino = ceph_vino(inode);
+	/* BUG_ON(vino.snap != CEPH_NOSNAP); */
+
+	return ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
+			vino, offset, len, num_ops, CEPH_OSD_OP_WRITE,
+			CEPH_OSD_FLAG_WRITE|CEPH_OSD_FLAG_ONDISK,
+			snapc, ci->i_truncate_seq, ci->i_truncate_size, true);
 }
 
 /*
@@ -653,7 +670,7 @@ static int ceph_writepages_start(struct address_space *mapping,
 	unsigned wsize = 1 << inode->i_blkbits;
 	struct ceph_osd_request *req = NULL;
 	int do_sync;
-	u64 snap_size = 0;
+	u64 snap_size;
 
 	/*
 	 * Include a 'sync' in the OSD request if this is a data
@@ -699,6 +716,7 @@ static int ceph_writepages_start(struct address_space *mapping,
 retry:
 	/* find oldest snap context with dirty data */
 	ceph_put_snap_context(snapc);
+	snap_size = 0;
 	snapc = get_oldest_context(inode, &snap_size);
 	if (!snapc) {
 		/* hmm, why does writepages get called when there
@@ -706,6 +724,8 @@ retry:
 		dout(" no snap context with dirty data?\n");
 		goto out;
 	}
+	if (snap_size == 0)
+		snap_size = i_size_read(inode);
 	dout(" oldest snapc is %p seq %lld (%d snaps)\n",
 	     snapc, snapc->seq, snapc->num_snaps);
 	if (last_snapc && snapc != last_snapc) {
@@ -718,10 +738,14 @@ retry:
 	last_snapc = snapc;
 
 	while (!done && index <= end) {
+		int num_ops = do_sync ? 2 : 1;
+		struct ceph_vino vino;
 		unsigned i;
 		int first;
 		pgoff_t next;
 		int pvec_pages, locked_pages;
+		struct page **pages = NULL;
+		mempool_t *pool = NULL;	/* Becomes non-null if mempool used */
 		struct page *page;
 		int want;
 		u64 offset, len;
@@ -773,11 +797,8 @@ get_more_pages:
 				dout("waiting on writeback %p\n", page);
 				wait_on_page_writeback(page);
 			}
-			if ((snap_size && page_offset(page) > snap_size) ||
-			    (!snap_size &&
-			     page_offset(page) > i_size_read(inode))) {
-				dout("%p page eof %llu\n", page, snap_size ?
-				     snap_size : i_size_read(inode));
+			if (page_offset(page) >= snap_size) {
+				dout("%p page eof %llu\n", page, snap_size);
 				done = 1;
 				unlock_page(page);
 				break;
@@ -805,22 +826,23 @@ get_more_pages:
 				break;
 			}
 
-			/* ok */
+			/*
+			 * We have something to write.  If this is
+			 * the first locked page this time through,
+			 * allocate an osd request and a page array
+			 * that it will use.
+			 */
 			if (locked_pages == 0) {
+				size_t size;
+
+				BUG_ON(pages);
+
 				/* prepare async write request */
-				offset = (u64) page_offset(page);
+				offset = (u64)page_offset(page);
 				len = wsize;
-				req = ceph_osdc_new_request(&fsc->client->osdc,
-					    &ci->i_layout,
-					    ceph_vino(inode),
-					    offset, &len,
-					    CEPH_OSD_OP_WRITE,
-					    CEPH_OSD_FLAG_WRITE |
-						    CEPH_OSD_FLAG_ONDISK,
-					    snapc, do_sync,
-					    ci->i_truncate_seq,
-					    ci->i_truncate_size,
-					    &inode->i_mtime, true, 0);
+				req = ceph_writepages_osd_request(inode,
+							offset, &len, snapc,
+							num_ops);
 
 				if (IS_ERR(req)) {
 					rc = PTR_ERR(req);
@@ -828,11 +850,17 @@ get_more_pages:
 					break;
 				}
 
-				max_pages = req->r_num_pages;
-
-				alloc_page_vec(fsc, req);
 				req->r_callback = writepages_finish;
 				req->r_inode = inode;
+
+				max_pages = calc_pages_for(0, (u64)len);
+				size = max_pages * sizeof (*pages);
+				pages = kmalloc(size, GFP_NOFS);
+				if (!pages) {
+					pool = fsc->wb_pagevec_pool;
+					pages = mempool_alloc(pool, GFP_NOFS);
+					BUG_ON(!pages);
+				}
 			}
 
 			/* note position of first page in pvec */
@@ -850,7 +878,7 @@ get_more_pages:
 			}
 
 			set_page_writeback(page);
-			req->r_pages[locked_pages] = page;
+			pages[locked_pages] = page;
 			locked_pages++;
 			next = page->index + 1;
 		}
@@ -879,18 +907,27 @@ get_more_pages:
 			pvec.nr -= i-first;
 		}
 
-		/* submit the write */
-		offset = req->r_pages[0]->index << PAGE_CACHE_SHIFT;
-		len = min((snap_size ? snap_size : i_size_read(inode)) - offset,
+		/* Format the osd request message and submit the write */
+
+		offset = page_offset(pages[0]);
+		len = min(snap_size - offset,
 			  (u64)locked_pages << PAGE_CACHE_SHIFT);
 		dout("writepages got %d pages at %llu~%llu\n",
 		     locked_pages, offset, len);
 
-		/* revise final length, page count */
-		req->r_num_pages = locked_pages;
-		req->r_request_ops[0].extent.length = cpu_to_le64(len);
-		req->r_request_ops[0].payload_len = cpu_to_le32(len);
-		req->r_request->hdr.data_len = cpu_to_le32(len);
+		osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
+							!!pool, false);
+
+		pages = NULL;	/* request message now owns the pages array */
+		pool = NULL;
+
+		/* Update the write op length in case we changed it */
+
+		osd_req_op_extent_update(req, 0, len);
+
+		vino = ceph_vino(inode);
+		ceph_osdc_build_request(req, offset, snapc, vino.snap,
+					&inode->i_mtime);
 
 		rc = ceph_osdc_start_request(&fsc->client->osdc, req, true);
 		BUG_ON(rc);
@@ -1067,51 +1104,23 @@ static int ceph_write_begin(struct file *file, struct address_space *mapping,
 			    struct page **pagep, void **fsdata)
 {
 	struct inode *inode = file_inode(file);
-	struct ceph_inode_info *ci = ceph_inode(inode);
-	struct ceph_file_info *fi = file->private_data;
 	struct page *page;
 	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
-	int r, want, got = 0;
-
-	if (fi->fmode & CEPH_FILE_MODE_LAZY)
-		want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
-	else
-		want = CEPH_CAP_FILE_BUFFER;
-
-	dout("write_begin %p %llx.%llx %llu~%u getting caps. i_size %llu\n",
-	     inode, ceph_vinop(inode), pos, len, inode->i_size);
-	r = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos+len);
-	if (r < 0)
-		return r;
-	dout("write_begin %p %llx.%llx %llu~%u  got cap refs on %s\n",
-	     inode, ceph_vinop(inode), pos, len, ceph_cap_string(got));
-	if (!(got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO))) {
-		ceph_put_cap_refs(ci, got);
-		return -EAGAIN;
-	}
+	int r;
 
 	do {
 		/* get a page */
 		page = grab_cache_page_write_begin(mapping, index, 0);
-		if (!page) {
-			r = -ENOMEM;
-			break;
-		}
+		if (!page)
+			return -ENOMEM;
+		*pagep = page;
 
 		dout("write_begin file %p inode %p page %p %d~%d\n", file,
 		     inode, page, (int)pos, (int)len);
 
 		r = ceph_update_writeable_page(file, pos, len, page);
-		if (r)
-			page_cache_release(page);
 	} while (r == -EAGAIN);
 
-	if (r) {
-		ceph_put_cap_refs(ci, got);
-	} else {
-		*pagep = page;
-		*(int *)fsdata = got;
-	}
 	return r;
 }
 
@@ -1125,12 +1134,10 @@ static int ceph_write_end(struct file *file, struct address_space *mapping,
 			  struct page *page, void *fsdata)
 {
 	struct inode *inode = file_inode(file);
-	struct ceph_inode_info *ci = ceph_inode(inode);
 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
 	struct ceph_mds_client *mdsc = fsc->mdsc;
 	unsigned from = pos & (PAGE_CACHE_SIZE - 1);
 	int check_cap = 0;
-	int got = (unsigned long)fsdata;
 
 	dout("write_end file %p inode %p page %p %d~%d (%d)\n", file,
 	     inode, page, (int)pos, (int)copied, (int)len);
@@ -1153,19 +1160,6 @@ static int ceph_write_end(struct file *file, struct address_space *mapping,
 	up_read(&mdsc->snap_rwsem);
 	page_cache_release(page);
 
-	if (copied > 0) {
-		int dirty;
-		spin_lock(&ci->i_ceph_lock);
-		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
-		spin_unlock(&ci->i_ceph_lock);
-		if (dirty)
-			__mark_inode_dirty(inode, dirty);
-	}
-
-	dout("write_end %p %llx.%llx %llu~%u  dropping cap refs on %s\n",
-	     inode, ceph_vinop(inode), pos, len, ceph_cap_string(got));
-	ceph_put_cap_refs(ci, got);
-
 	if (check_cap)
 		ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL);
 
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 78e2f575247d..da0f9b8a3bcb 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -490,15 +490,17 @@ static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
 		ci->i_rdcache_gen++;
 
 	/*
-	 * if we are newly issued FILE_SHARED, clear D_COMPLETE; we
+	 * if we are newly issued FILE_SHARED, mark dir not complete; we
 	 * don't know what happened to this directory while we didn't
 	 * have the cap.
 	 */
 	if ((issued & CEPH_CAP_FILE_SHARED) &&
 	    (had & CEPH_CAP_FILE_SHARED) == 0) {
 		ci->i_shared_gen++;
-		if (S_ISDIR(ci->vfs_inode.i_mode))
-			ceph_dir_clear_complete(&ci->vfs_inode);
+		if (S_ISDIR(ci->vfs_inode.i_mode)) {
+			dout(" marking %p NOT complete\n", &ci->vfs_inode);
+			__ceph_dir_clear_complete(ci);
+		}
 	}
 }
 
@@ -553,6 +555,7 @@ retry:
 		cap->implemented = 0;
 		cap->mds = mds;
 		cap->mds_wanted = 0;
+		cap->mseq = 0;
 
 		cap->ci = ci;
 		__insert_cap_node(ci, cap);
@@ -628,7 +631,10 @@ retry:
 	cap->cap_id = cap_id;
 	cap->issued = issued;
 	cap->implemented |= issued;
-	cap->mds_wanted |= wanted;
+	if (mseq > cap->mseq)
+		cap->mds_wanted = wanted;
+	else
+		cap->mds_wanted |= wanted;
 	cap->seq = seq;
 	cap->issue_seq = seq;
 	cap->mseq = mseq;
@@ -997,9 +1003,9 @@ static int send_cap_msg(struct ceph_mds_session *session,
 	return 0;
 }
 
-static void __queue_cap_release(struct ceph_mds_session *session,
-				u64 ino, u64 cap_id, u32 migrate_seq,
-				u32 issue_seq)
+void __queue_cap_release(struct ceph_mds_session *session,
+			 u64 ino, u64 cap_id, u32 migrate_seq,
+			 u32 issue_seq)
 {
 	struct ceph_msg *msg;
 	struct ceph_mds_cap_release *head;
@@ -2046,6 +2052,13 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
 		goto out;
 	}
 
+	/* finish pending truncate */
+	while (ci->i_truncate_pending) {
+		spin_unlock(&ci->i_ceph_lock);
+		__ceph_do_pending_vmtruncate(inode, !(need & CEPH_CAP_FILE_WR));
+		spin_lock(&ci->i_ceph_lock);
+	}
+
 	if (need & CEPH_CAP_FILE_WR) {
 		if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
 			dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
@@ -2067,12 +2080,6 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
 	}
 	have = __ceph_caps_issued(ci, &implemented);
 
-	/*
-	 * disallow writes while a truncate is pending
-	 */
-	if (ci->i_truncate_pending)
-		have &= ~CEPH_CAP_FILE_WR;
-
 	if ((have & need) == need) {
 		/*
 		 * Look at (implemented & ~have & not) so that we keep waiting
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 6d797f46d772..f02d82b7933e 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -107,7 +107,7 @@ static unsigned fpos_off(loff_t p)
  * falling back to a "normal" sync readdir if any dentries in the dir
  * are dropped.
  *
- * D_COMPLETE tells indicates we have all dentries in the dir.  It is
+ * Complete dir indicates that we have all dentries in the dir.  It is
  * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
  * the MDS if/when the directory is modified).
  */
@@ -198,8 +198,8 @@ more:
 	filp->f_pos++;
 
 	/* make sure a dentry wasn't dropped while we didn't have parent lock */
-	if (!ceph_dir_test_complete(dir)) {
-		dout(" lost D_COMPLETE on %p; falling back to mds\n", dir);
+	if (!ceph_dir_is_complete(dir)) {
+		dout(" lost dir complete on %p; falling back to mds\n", dir);
 		err = -EAGAIN;
 		goto out;
 	}
@@ -258,7 +258,7 @@ static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
 	if (filp->f_pos == 0) {
 		/* note dir version at start of readdir so we can tell
 		 * if any dentries get dropped */
-		fi->dir_release_count = ci->i_release_count;
+		fi->dir_release_count = atomic_read(&ci->i_release_count);
 
 		dout("readdir off 0 -> '.'\n");
 		if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0),
@@ -284,7 +284,7 @@ static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
 	if ((filp->f_pos == 2 || fi->dentry) &&
 	    !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
 	    ceph_snap(inode) != CEPH_SNAPDIR &&
-	    ceph_dir_test_complete(inode) &&
+	    __ceph_dir_is_complete(ci) &&
 	    __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
 		spin_unlock(&ci->i_ceph_lock);
 		err = __dcache_readdir(filp, dirent, filldir);
@@ -350,7 +350,8 @@ more:
 
 		if (!req->r_did_prepopulate) {
 			dout("readdir !did_prepopulate");
-			fi->dir_release_count--;    /* preclude D_COMPLETE */
+			/* preclude from marking dir complete */
+			fi->dir_release_count--;
 		}
 
 		/* note next offset and last dentry name */
@@ -428,8 +429,9 @@ more:
 	 * the complete dir contents in our cache.
 	 */
 	spin_lock(&ci->i_ceph_lock);
-	if (ci->i_release_count == fi->dir_release_count) {
-		ceph_dir_set_complete(inode);
+	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);
 		ci->i_max_offset = filp->f_pos;
 	}
 	spin_unlock(&ci->i_ceph_lock);
@@ -604,7 +606,7 @@ static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
 			    fsc->mount_options->snapdir_name,
 			    dentry->d_name.len) &&
 		    !is_root_ceph_dentry(dir, dentry) &&
-		    ceph_dir_test_complete(dir) &&
+		    __ceph_dir_is_complete(ci) &&
 		    (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
 			spin_unlock(&ci->i_ceph_lock);
 			dout(" dir %p complete, -ENOENT\n", dir);
@@ -1065,44 +1067,6 @@ static int ceph_snapdir_d_revalidate(struct dentry *dentry,
 }
 
 /*
- * Set/clear/test dir complete flag on the dir's dentry.
- */
-void ceph_dir_set_complete(struct inode *inode)
-{
-	struct dentry *dentry = d_find_any_alias(inode);
-	
-	if (dentry && ceph_dentry(dentry) &&
-	    ceph_test_mount_opt(ceph_sb_to_client(dentry->d_sb), DCACHE)) {
-		dout(" marking %p (%p) complete\n", inode, dentry);
-		set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
-	}
-	dput(dentry);
-}
-
-void ceph_dir_clear_complete(struct inode *inode)
-{
-	struct dentry *dentry = d_find_any_alias(inode);
-
-	if (dentry && ceph_dentry(dentry)) {
-		dout(" marking %p (%p) complete\n", inode, dentry);
-		set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
-	}
-	dput(dentry);
-}
-
-bool ceph_dir_test_complete(struct inode *inode)
-{
-	struct dentry *dentry = d_find_any_alias(inode);
-
-	if (dentry && ceph_dentry(dentry)) {
-		dout(" marking %p (%p) NOT complete\n", inode, dentry);
-		clear_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
-	}
-	dput(dentry);
-	return false;
-}
-
-/*
  * When the VFS prunes a dentry from the cache, we need to clear the
  * complete flag on the parent directory.
  *
@@ -1110,15 +1074,13 @@ bool ceph_dir_test_complete(struct inode *inode)
  */
 static void ceph_d_prune(struct dentry *dentry)
 {
-	struct ceph_dentry_info *di;
-
 	dout("ceph_d_prune %p\n", dentry);
 
 	/* do we have a valid parent? */
 	if (IS_ROOT(dentry))
 		return;
 
-	/* if we are not hashed, we don't affect D_COMPLETE */
+	/* if we are not hashed, we don't affect dir's completeness */
 	if (d_unhashed(dentry))
 		return;
 
@@ -1126,8 +1088,7 @@ static void ceph_d_prune(struct dentry *dentry)
 	 * we hold d_lock, so d_parent is stable, and d_fsdata is never
 	 * cleared until d_release
 	 */
-	di = ceph_dentry(dentry->d_parent);
-	clear_bit(CEPH_D_COMPLETE, &di->flags);
+	ceph_dir_clear_complete(dentry->d_parent->d_inode);
 }
 
 /*
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index bf338d9b67e3..d70830c66833 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -446,19 +446,35 @@ done:
 }
 
 /*
- * Write commit callback, called if we requested both an ACK and
- * ONDISK commit reply from the OSD.
+ * Write commit request unsafe callback, called to tell us when a
+ * request is unsafe (that is, in flight--has been handed to the
+ * messenger to send to its target osd).  It is called again when
+ * we've received a response message indicating the request is
+ * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
+ * is completed early (and unsuccessfully) due to a timeout or
+ * interrupt.
+ *
+ * This is used if we requested both an ACK and ONDISK commit reply
+ * from the OSD.
  */
-static void sync_write_commit(struct ceph_osd_request *req,
-			      struct ceph_msg *msg)
+static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
 {
 	struct ceph_inode_info *ci = ceph_inode(req->r_inode);
 
-	dout("sync_write_commit %p tid %llu\n", req, req->r_tid);
-	spin_lock(&ci->i_unsafe_lock);
-	list_del_init(&req->r_unsafe_item);
-	spin_unlock(&ci->i_unsafe_lock);
-	ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
+	dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
+		unsafe ? "un" : "");
+	if (unsafe) {
+		ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
+		spin_lock(&ci->i_unsafe_lock);
+		list_add_tail(&req->r_unsafe_item,
+			      &ci->i_unsafe_writes);
+		spin_unlock(&ci->i_unsafe_lock);
+	} else {
+		spin_lock(&ci->i_unsafe_lock);
+		list_del_init(&req->r_unsafe_item);
+		spin_unlock(&ci->i_unsafe_lock);
+		ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
+	}
 }
 
 /*
@@ -470,36 +486,33 @@ static void sync_write_commit(struct ceph_osd_request *req,
  * objects, rollback on failure, etc.)
  */
 static ssize_t ceph_sync_write(struct file *file, const char __user *data,
-			       size_t left, loff_t *offset)
+			       size_t left, loff_t pos, loff_t *ppos)
 {
 	struct inode *inode = file_inode(file);
 	struct ceph_inode_info *ci = ceph_inode(inode);
 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
+	struct ceph_snap_context *snapc;
+	struct ceph_vino vino;
 	struct ceph_osd_request *req;
+	int num_ops = 1;
 	struct page **pages;
 	int num_pages;
-	long long unsigned pos;
 	u64 len;
 	int written = 0;
 	int flags;
-	int do_sync = 0;
 	int check_caps = 0;
 	int page_align, io_align;
 	unsigned long buf_align;
 	int ret;
 	struct timespec mtime = CURRENT_TIME;
+	bool own_pages = false;
 
 	if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
 		return -EROFS;
 
-	dout("sync_write on file %p %lld~%u %s\n", file, *offset,
+	dout("sync_write on file %p %lld~%u %s\n", file, pos,
 	     (unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
 
-	if (file->f_flags & O_APPEND)
-		pos = i_size_read(inode);
-	else
-		pos = *offset;
-
 	ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left);
 	if (ret < 0)
 		return ret;
@@ -516,7 +529,7 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
 	if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0)
 		flags |= CEPH_OSD_FLAG_ACK;
 	else
-		do_sync = 1;
+		num_ops++;	/* Also include a 'startsync' command. */
 
 	/*
 	 * we may need to do multiple writes here if we span an object
@@ -526,25 +539,20 @@ more:
 	io_align = pos & ~PAGE_MASK;
 	buf_align = (unsigned long)data & ~PAGE_MASK;
 	len = left;
-	if (file->f_flags & O_DIRECT) {
-		/* write from beginning of first page, regardless of
-		   io alignment */
-		page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
-		num_pages = calc_pages_for((unsigned long)data, len);
-	} else {
-		page_align = pos & ~PAGE_MASK;
-		num_pages = calc_pages_for(pos, len);
-	}
+
+	snapc = ci->i_snap_realm->cached_context;
+	vino = ceph_vino(inode);
 	req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
-				    ceph_vino(inode), pos, &len,
-				    CEPH_OSD_OP_WRITE, flags,
-				    ci->i_snap_realm->cached_context,
-				    do_sync,
+				    vino, pos, &len, num_ops,
+				    CEPH_OSD_OP_WRITE, flags, snapc,
 				    ci->i_truncate_seq, ci->i_truncate_size,
-				    &mtime, false, page_align);
+				    false);
 	if (IS_ERR(req))
 		return PTR_ERR(req);
 
+	/* write from beginning of first page, regardless of io alignment */
+	page_align = file->f_flags & O_DIRECT ? buf_align : io_align;
+	num_pages = calc_pages_for(page_align, len);
 	if (file->f_flags & O_DIRECT) {
 		pages = ceph_get_direct_page_vector(data, num_pages, false);
 		if (IS_ERR(pages)) {
@@ -572,36 +580,20 @@ more:
 
 		if ((file->f_flags & O_SYNC) == 0) {
 			/* get a second commit callback */
-			req->r_safe_callback = sync_write_commit;
-			req->r_own_pages = 1;
+			req->r_unsafe_callback = ceph_sync_write_unsafe;
+			req->r_inode = inode;
+			own_pages = true;
 		}
 	}
-	req->r_pages = pages;
-	req->r_num_pages = num_pages;
-	req->r_inode = inode;
+	osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
+					false, own_pages);
+
+	/* BUG_ON(vino.snap != CEPH_NOSNAP); */
+	ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
 
 	ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
-	if (!ret) {
-		if (req->r_safe_callback) {
-			/*
-			 * Add to inode unsafe list only after we
-			 * start_request so that a tid has been assigned.
-			 */
-			spin_lock(&ci->i_unsafe_lock);
-			list_add_tail(&req->r_unsafe_item,
-				      &ci->i_unsafe_writes);
-			spin_unlock(&ci->i_unsafe_lock);
-			ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
-		}
-		
+	if (!ret)
 		ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
-		if (ret < 0 && req->r_safe_callback) {
-			spin_lock(&ci->i_unsafe_lock);
-			list_del_init(&req->r_unsafe_item);
-			spin_unlock(&ci->i_unsafe_lock);
-			ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
-		}
-	}
 
 	if (file->f_flags & O_DIRECT)
 		ceph_put_page_vector(pages, num_pages, false);
@@ -614,12 +606,12 @@ out:
 		pos += len;
 		written += len;
 		left -= len;
-		data += written;
+		data += len;
 		if (left)
 			goto more;
 
 		ret = written;
-		*offset = pos;
+		*ppos = pos;
 		if (pos > i_size_read(inode))
 			check_caps = ceph_inode_set_size(inode, pos);
 		if (check_caps)
@@ -653,7 +645,6 @@ static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
 	dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
 	     inode, ceph_vinop(inode), pos, (unsigned)len, inode);
 again:
-	__ceph_do_pending_vmtruncate(inode);
 	if (fi->fmode & CEPH_FILE_MODE_LAZY)
 		want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
 	else
@@ -717,55 +708,75 @@ static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
 	struct ceph_inode_info *ci = ceph_inode(inode);
 	struct ceph_osd_client *osdc =
 		&ceph_sb_to_client(inode->i_sb)->client->osdc;
-	loff_t endoff = pos + iov->iov_len;
-	int got = 0;
-	int ret, err, written;
+	ssize_t count, written = 0;
+	int err, want, got;
+	bool hold_mutex;
 
 	if (ceph_snap(inode) != CEPH_NOSNAP)
 		return -EROFS;
 
-retry_snap:
-	written = 0;
-	if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
-		return -ENOSPC;
-	__ceph_do_pending_vmtruncate(inode);
+	sb_start_write(inode->i_sb);
+	mutex_lock(&inode->i_mutex);
+	hold_mutex = true;
 
-	/*
-	 * try to do a buffered write.  if we don't have sufficient
-	 * caps, we'll get -EAGAIN from generic_file_aio_write, or a
-	 * short write if we only get caps for some pages.
-	 */
-	if (!(iocb->ki_filp->f_flags & O_DIRECT) &&
-	    !(inode->i_sb->s_flags & MS_SYNCHRONOUS) &&
-	    !(fi->flags & CEPH_F_SYNC)) {
-		ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
-		if (ret >= 0)
-			written = ret;
-
-		if ((ret >= 0 || ret == -EIOCBQUEUED) &&
-		    ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host)
-		     || ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
-			err = vfs_fsync_range(file, pos, pos + written - 1, 1);
-			if (err < 0)
-				ret = err;
-		}
-		if ((ret < 0 && ret != -EAGAIN) || pos + written >= endoff)
-			goto out;
+	err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
+	if (err)
+		goto out;
+
+	/* We can write back this queue in page reclaim */
+	current->backing_dev_info = file->f_mapping->backing_dev_info;
+
+	err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
+	if (err)
+		goto out;
+
+	if (count == 0)
+		goto out;
+
+	err = file_remove_suid(file);
+	if (err)
+		goto out;
+
+	err = file_update_time(file);
+	if (err)
+		goto out;
+
+retry_snap:
+	if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
+		err = -ENOSPC;
+		goto out;
 	}
 
-	dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n",
-	     inode, ceph_vinop(inode), pos + written,
-	     (unsigned)iov->iov_len - written, inode->i_size);
-	ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, 0, &got, endoff);
-	if (ret < 0)
+	dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
+	     inode, ceph_vinop(inode), pos, count, inode->i_size);
+	if (fi->fmode & CEPH_FILE_MODE_LAZY)
+		want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
+	else
+		want = CEPH_CAP_FILE_BUFFER;
+	got = 0;