8 files changed, 540 insertions, 211 deletions

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index ef3ebd780aff..a0f1e2b91c8e 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -315,7 +315,32 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
 	struct page **pages;
 	pgoff_t next_index;
 	int nr_pages = 0;
-	int ret;
+	int got = 0;
+	int ret = 0;
+
+	if (!current->journal_info) {
+		/* caller of readpages does not hold buffer and read caps
+		 * (fadvise, madvise and readahead cases) */
+		int want = CEPH_CAP_FILE_CACHE;
+		ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got);
+		if (ret < 0) {
+			dout("start_read %p, error getting cap\n", inode);
+		} else if (!(got & want)) {
+			dout("start_read %p, no cache cap\n", inode);
+			ret = 0;
+		}
+		if (ret <= 0) {
+			if (got)
+				ceph_put_cap_refs(ci, got);
+			while (!list_empty(page_list)) {
+				page = list_entry(page_list->prev,
+						  struct page, lru);
+				list_del(&page->lru);
+				put_page(page);
+			}
+			return ret;
+		}
+	}
 
 	off = (u64) page_offset(page);
 
@@ -338,15 +363,18 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
 				    CEPH_OSD_FLAG_READ, NULL,
 				    ci->i_truncate_seq, ci->i_truncate_size,
 				    false);
-	if (IS_ERR(req))
-		return PTR_ERR(req);
+	if (IS_ERR(req)) {
+		ret = PTR_ERR(req);
+		goto out;
+	}
 
 	/* build page vector */
 	nr_pages = calc_pages_for(0, len);
 	pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL);
-	ret = -ENOMEM;
-	if (!pages)
-		goto out;
+	if (!pages) {
+		ret = -ENOMEM;
+		goto out_put;
+	}
 	for (i = 0; i < nr_pages; ++i) {
 		page = list_entry(page_list->prev, struct page, lru);
 		BUG_ON(PageLocked(page));
@@ -378,6 +406,12 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
 	if (ret < 0)
 		goto out_pages;
 	ceph_osdc_put_request(req);
+
+	/* After adding locked pages to page cache, the inode holds cache cap.
+	 * So we can drop our cap refs. */
+	if (got)
+		ceph_put_cap_refs(ci, got);
+
 	return nr_pages;
 
 out_pages:
@@ -386,8 +420,11 @@ out_pages:
 		unlock_page(pages[i]);
 	}
 	ceph_put_page_vector(pages, nr_pages, false);
-out:
+out_put:
 	ceph_osdc_put_request(req);
+out:
+	if (got)
+		ceph_put_cap_refs(ci, got);
 	return ret;
 }
 
@@ -424,7 +461,6 @@ static int ceph_readpages(struct file *file, struct address_space *mapping,
 		rc = start_read(inode, page_list, max);
 		if (rc < 0)
 			goto out;
-		BUG_ON(rc == 0);
 	}
 out:
 	ceph_fscache_readpages_cancel(inode, page_list);
@@ -438,7 +474,9 @@ out:
  * only snap context we are allowed to write back.
  */
 static struct ceph_snap_context *get_oldest_context(struct inode *inode,
-						    loff_t *snap_size)
+						    loff_t *snap_size,
+						    u64 *truncate_size,
+						    u32 *truncate_seq)
 {
 	struct ceph_inode_info *ci = ceph_inode(inode);
 	struct ceph_snap_context *snapc = NULL;
@@ -452,6 +490,10 @@ static struct ceph_snap_context *get_oldest_context(struct inode *inode,
 			snapc = ceph_get_snap_context(capsnap->context);
 			if (snap_size)
 				*snap_size = capsnap->size;
+			if (truncate_size)
+				*truncate_size = capsnap->truncate_size;
+			if (truncate_seq)
+				*truncate_seq = capsnap->truncate_seq;
 			break;
 		}
 	}
@@ -459,6 +501,10 @@ static struct ceph_snap_context *get_oldest_context(struct inode *inode,
 		snapc = ceph_get_snap_context(ci->i_head_snapc);
 		dout(" head snapc %p has %d dirty pages\n",
 		     snapc, ci->i_wrbuffer_ref_head);
+		if (truncate_size)
+			*truncate_size = capsnap->truncate_size;
+		if (truncate_seq)
+			*truncate_seq = capsnap->truncate_seq;
 	}
 	spin_unlock(&ci->i_ceph_lock);
 	return snapc;
@@ -501,7 +547,8 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
 		dout("writepage %p page %p not dirty?\n", inode, page);
 		goto out;
 	}
-	oldest = get_oldest_context(inode, &snap_size);
+	oldest = get_oldest_context(inode, &snap_size,
+				    &truncate_size, &truncate_seq);
 	if (snapc->seq > oldest->seq) {
 		dout("writepage %p page %p snapc %p not writeable - noop\n",
 		     inode, page, snapc);
@@ -512,12 +559,8 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
 	}
 	ceph_put_snap_context(oldest);
 
-	spin_lock(&ci->i_ceph_lock);
-	truncate_seq = ci->i_truncate_seq;
-	truncate_size = ci->i_truncate_size;
 	if (snap_size == -1)
 		snap_size = i_size_read(inode);
-	spin_unlock(&ci->i_ceph_lock);
 
 	/* is this a partial page at end of file? */
 	if (page_off >= snap_size) {
@@ -764,7 +807,8 @@ retry:
 	/* find oldest snap context with dirty data */
 	ceph_put_snap_context(snapc);
 	snap_size = -1;
-	snapc = get_oldest_context(inode, &snap_size);
+	snapc = get_oldest_context(inode, &snap_size,
+				   &truncate_size, &truncate_seq);
 	if (!snapc) {
 		/* hmm, why does writepages get called when there
 		   is no dirty data? */
@@ -774,11 +818,7 @@ retry:
 	dout(" oldest snapc is %p seq %lld (%d snaps)\n",
 	     snapc, snapc->seq, snapc->num_snaps);
 
-	spin_lock(&ci->i_ceph_lock);
-	truncate_seq = ci->i_truncate_seq;
-	truncate_size = ci->i_truncate_size;
 	i_size = i_size_read(inode);
-	spin_unlock(&ci->i_ceph_lock);
 
 	if (last_snapc && snapc != last_snapc) {
 		/* if we switched to a newer snapc, restart our scan at the
@@ -1124,7 +1164,8 @@ out:
 static int context_is_writeable_or_written(struct inode *inode,
 					   struct ceph_snap_context *snapc)
 {
-	struct ceph_snap_context *oldest = get_oldest_context(inode, NULL);
+	struct ceph_snap_context *oldest = get_oldest_context(inode, NULL,
+							      NULL, NULL);
 	int ret = !oldest || snapc->seq <= oldest->seq;
 
 	ceph_put_snap_context(oldest);
@@ -1169,7 +1210,7 @@ retry_locked:
 		 * this page is already dirty in another (older) snap
 		 * context!  is it writeable now?
 		 */
-		oldest = get_oldest_context(inode, NULL);
+		oldest = get_oldest_context(inode, NULL, NULL, NULL);
 
 		if (snapc->seq > oldest->seq) {
 			ceph_put_snap_context(oldest);
@@ -1371,9 +1412,11 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	     inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got));
 
 	if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
-	    ci->i_inline_version == CEPH_INLINE_NONE)
+	    ci->i_inline_version == CEPH_INLINE_NONE) {
+		current->journal_info = vma->vm_file;
 		ret = filemap_fault(vma, vmf);
-	else
+		current->journal_info = NULL;
+	} else
 		ret = -EAGAIN;
 
 	dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n",
@@ -1905,6 +1948,15 @@ int ceph_pool_perm_check(struct ceph_inode_info *ci, int need)
 	struct ceph_string *pool_ns;
 	int ret, flags;
 
+	if (ci->i_vino.snap != CEPH_NOSNAP) {
+		/*
+		 * Pool permission check needs to write to the first object.
+		 * But for snapshot, head of the first object may have alread
+		 * been deleted. Skip check to avoid creating orphan object.
+		 */
+		return 0;
+	}
+
 	if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode),
 				NOPOOLPERM))
 		return 0;
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 16e6ded0b7f2..baea866a6751 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -987,96 +987,127 @@ void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
 		__cap_delay_cancel(mdsc, ci);
 }
 
+struct cap_msg_args {
+	struct ceph_mds_session	*session;
+	u64			ino, cid, follows;
+	u64			flush_tid, oldest_flush_tid, size, max_size;
+	u64			xattr_version;
+	struct ceph_buffer	*xattr_buf;
+	struct timespec		atime, mtime, ctime;
+	int			op, caps, wanted, dirty;
+	u32			seq, issue_seq, mseq, time_warp_seq;
+	u32			flags;
+	kuid_t			uid;
+	kgid_t			gid;
+	umode_t			mode;
+	bool			inline_data;
+};
+
 /*
  * Build and send a cap message to the given MDS.
  *
  * Caller should be holding s_mutex.
  */
-static int send_cap_msg(struct ceph_mds_session *session,
-			u64 ino, u64 cid, int op,
-			int caps, int wanted, int dirty,
-			u32 seq, u64 flush_tid, u64 oldest_flush_tid,
-			u32 issue_seq, u32 mseq, u64 size, u64 max_size,
-			struct timespec *mtime, struct timespec *atime,
-			struct timespec *ctime, u32 time_warp_seq,
-			kuid_t uid, kgid_t gid, umode_t mode,
-			u64 xattr_version,
-			struct ceph_buffer *xattrs_buf,
-			u64 follows, bool inline_data)
+static int send_cap_msg(struct cap_msg_args *arg)
 {
 	struct ceph_mds_caps *fc;
 	struct ceph_msg *msg;
 	void *p;
 	size_t extra_len;
+	struct timespec zerotime = {0};
 
 	dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
 	     " seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu"
-	     " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
-	     cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
-	     ceph_cap_string(dirty),
-	     seq, issue_seq, flush_tid, oldest_flush_tid,
-	     mseq, follows, size, max_size,
-	     xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
+	     " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(arg->op),
+	     arg->cid, arg->ino, ceph_cap_string(arg->caps),
+	     ceph_cap_string(arg->wanted), ceph_cap_string(arg->dirty),
+	     arg->seq, arg->issue_seq, arg->flush_tid, arg->oldest_flush_tid,
+	     arg->mseq, arg->follows, arg->size, arg->max_size,
+	     arg->xattr_version,
+	     arg->xattr_buf ? (int)arg->xattr_buf->vec.iov_len : 0);
 
 	/* flock buffer size + inline version + inline data size +
 	 * osd_epoch_barrier + oldest_flush_tid */
-	extra_len = 4 + 8 + 4 + 4 + 8;
+	extra_len = 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4;
 	msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc) + extra_len,
 			   GFP_NOFS, false);
 	if (!msg)
 		return -ENOMEM;
 
-	msg->hdr.version = cpu_to_le16(6);
-	msg->hdr.tid = cpu_to_le64(flush_tid);
+	msg->hdr.version = cpu_to_le16(10);
+	msg->hdr.tid = cpu_to_le64(arg->flush_tid);
 
 	fc = msg->front.iov_base;
 	memset(fc, 0, sizeof(*fc));
 
-	fc->cap_id = cpu_to_le64(cid);
-	fc->op = cpu_to_le32(op);
-	fc->seq = cpu_to_le32(seq);
-	fc->issue_seq = cpu_to_le32(issue_seq);
-	fc->migrate_seq = cpu_to_le32(mseq);
-	fc->caps = cpu_to_le32(caps);
-	fc->wanted = cpu_to_le32(wanted);
-	fc->dirty = cpu_to_le32(dirty);
-	fc->ino = cpu_to_le64(ino);
-	fc->snap_follows = cpu_to_le64(follows);
-
-	fc->size = cpu_to_le64(size);
-	fc->max_size = cpu_to_le64(max_size);
-	if (mtime)
-		ceph_encode_timespec(&fc->mtime, mtime);
-	if (atime)
-		ceph_encode_timespec(&fc->atime, atime);
-	if (ctime)
-		ceph_encode_timespec(&fc->ctime, ctime);
-	fc->time_warp_seq = cpu_to_le32(time_warp_seq);
-
-	fc->uid = cpu_to_le32(from_kuid(&init_user_ns, uid));
-	fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid));
-	fc->mode = cpu_to_le32(mode);
+	fc->cap_id = cpu_to_le64(arg->cid);
+	fc->op = cpu_to_le32(arg->op);
+	fc->seq = cpu_to_le32(arg->seq);
+	fc->issue_seq = cpu_to_le32(arg->issue_seq);
+	fc->migrate_seq = cpu_to_le32(arg->mseq);
+	fc->caps = cpu_to_le32(arg->caps);
+	fc->wanted = cpu_to_le32(arg->wanted);
+	fc->dirty = cpu_to_le32(arg->dirty);
+	fc->ino = cpu_to_le64(arg->ino);
+	fc->snap_follows = cpu_to_le64(arg->follows);
+
+	fc->size = cpu_to_le64(arg->size);
+	fc->max_size = cpu_to_le64(arg->max_size);
+	ceph_encode_timespec(&fc->mtime, &arg->mtime);
+	ceph_encode_timespec(&fc->atime, &arg->atime);
+	ceph_encode_timespec(&fc->ctime, &arg->ctime);
+	fc->time_warp_seq = cpu_to_le32(arg->time_warp_seq);
+
+	fc->uid = cpu_to_le32(from_kuid(&init_user_ns, arg->uid));
+	fc->gid = cpu_to_le32(from_kgid(&init_user_ns, arg->gid));
+	fc->mode = cpu_to_le32(arg->mode);
+
+	fc->xattr_version = cpu_to_le64(arg->xattr_version);
+	if (arg->xattr_buf) {
+		msg->middle = ceph_buffer_get(arg->xattr_buf);
+		fc->xattr_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
+		msg->hdr.middle_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
+	}
 
 	p = fc + 1;
-	/* flock buffer size */
+	/* flock buffer size (version 2) */
 	ceph_encode_32(&p, 0);
-	/* inline version */
-	ceph_encode_64(&p, inline_data ? 0 : CEPH_INLINE_NONE);
+	/* inline version (version 4) */
+	ceph_encode_64(&p, arg->inline_data ? 0 : CEPH_INLINE_NONE);
 	/* inline data size */
 	ceph_encode_32(&p, 0);
-	/* osd_epoch_barrier */
+	/* osd_epoch_barrier (version 5) */
 	ceph_encode_32(&p, 0);
-	/* oldest_flush_tid */
-	ceph_encode_64(&p, oldest_flush_tid);
+	/* oldest_flush_tid (version 6) */
+	ceph_encode_64(&p, arg->oldest_flush_tid);
 
-	fc->xattr_version = cpu_to_le64(xattr_version);
-	if (xattrs_buf) {
-		msg->middle = ceph_buffer_get(xattrs_buf);
-		fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
-		msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
-	}
+	/*
+	 * caller_uid/caller_gid (version 7)
+	 *
+	 * Currently, we don't properly track which caller dirtied the caps
+	 * last, and force a flush of them when there is a conflict. For now,
+	 * just set this to 0:0, to emulate how the MDS has worked up to now.
+	 */
+	ceph_encode_32(&p, 0);
+	ceph_encode_32(&p, 0);
+
+	/* pool namespace (version 8) (mds always ignores this) */
+	ceph_encode_32(&p, 0);
 
-	ceph_con_send(&session->s_con, msg);
+	/*
+	 * btime and change_attr (version 9)
+	 *
+	 * We just zero these out for now, as the MDS ignores them unless
+	 * the requisite feature flags are set (which we don't do yet).
+	 */
+	ceph_encode_timespec(p, &zerotime);
+	p += sizeof(struct ceph_timespec);
+	ceph_encode_64(&p, 0);
+
+	/* Advisory flags (version 10) */
+	ceph_encode_32(&p, arg->flags);
+
+	ceph_con_send(&arg->session->s_con, msg);
 	return 0;
 }
 
@@ -1115,27 +1146,17 @@ void ceph_queue_caps_release(struct inode *inode)
  * caller should hold snap_rwsem (read), s_mutex.
  */
 static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
-		      int op, int used, int want, int retain, int flushing,
-		      u64 flush_tid, u64 oldest_flush_tid)
+		      int op, bool sync, int used, int want, int retain,
+		      int flushing, u64 flush_tid, u64 oldest_flush_tid)
 	__releases(cap->ci->i_ceph_lock)
 {
 	struct ceph_inode_info *ci = cap->ci;
 	struct inode *inode = &ci->vfs_inode;
-	u64 cap_id = cap->cap_id;
-	int held, revoking, dropping, keep;
-	u64 follows, size, max_size;
-	u32 seq, issue_seq, mseq, time_warp_seq;
-	struct timespec mtime, atime, ctime;
+	struct cap_msg_args arg;
+	int held, revoking, dropping;
 	int wake = 0;
-	umode_t mode;
-	kuid_t uid;
-	kgid_t gid;
-	struct ceph_mds_session *session;
-	u64 xattr_version = 0;
-	struct ceph_buffer *xattr_blob = NULL;
 	int delayed = 0;
 	int ret;
-	bool inline_data;
 
 	held = cap->issued | cap->implemented;
 	revoking = cap->implemented & ~cap->issued;
@@ -1148,7 +1169,7 @@ static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
 	     ceph_cap_string(revoking));
 	BUG_ON((retain & CEPH_CAP_PIN) == 0);
 
-	session = cap->session;
+	arg.session = cap->session;
 
 	/* don't release wanted unless we've waited a bit. */
 	if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
@@ -1177,40 +1198,51 @@ static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
 	cap->implemented &= cap->issued | used;
 	cap->mds_wanted = want;
 
-	follows = flushing ? ci->i_head_snapc->seq : 0;
-
-	keep = cap->implemented;
-	seq = cap->seq;
-	issue_seq = cap->issue_seq;
-	mseq = cap->mseq;
-	size = inode->i_size;
-	ci->i_reported_size = size;
-	max_size = ci->i_wanted_max_size;
-	ci->i_requested_max_size = max_size;
-	mtime = inode->i_mtime;
-	atime = inode->i_atime;
-	ctime = inode->i_ctime;
-	time_warp_seq = ci->i_time_warp_seq;
-	uid = inode->i_uid;
-	gid = inode->i_gid;
-	mode = inode->i_mode;
+	arg.ino = ceph_vino(inode).ino;
+	arg.cid = cap->cap_id;
+	arg.follows = flushing ? ci->i_head_snapc->seq : 0;
+	arg.flush_tid = flush_tid;
+	arg.oldest_flush_tid = oldest_flush_tid;
+
+	arg.size = inode->i_size;
+	ci->i_reported_size = arg.size;
+	arg.max_size = ci->i_wanted_max_size;
+	ci->i_requested_max_size = arg.max_size;
 
 	if (flushing & CEPH_CAP_XATTR_EXCL) {
 		__ceph_build_xattrs_blob(ci);
-		xattr_blob = ci->i_xattrs.blob;
-		xattr_version = ci->i_xattrs.version;
+		arg.xattr_version = ci->i_xattrs.version;
+		arg.xattr_buf = ci->i_xattrs.blob;
+	} else {
+		arg.xattr_buf = NULL;
 	}
 
-	inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
+	arg.mtime = inode->i_mtime;
+	arg.atime = inode->i_atime;
+	arg.ctime = inode->i_ctime;
+
+	arg.op = op;
+	arg.caps = cap->implemented;
+	arg.wanted = want;
+	arg.dirty = flushing;
+
+	arg.seq = cap->seq;
+	arg.issue_seq = cap->issue_seq;
+	arg.mseq = cap->mseq;
+	arg.time_warp_seq = ci->i_time_warp_seq;
+
+	arg.uid = inode->i_uid;
+	arg.gid = inode->i_gid;
+	arg.mode = inode->i_mode;
+
+	arg.inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
+	arg.flags = 0;
+	if (sync)
+		arg.flags |= CEPH_CLIENT_CAPS_SYNC;
 
 	spin_unlock(&ci->i_ceph_lock);
 
-	ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
-		op, keep, want, flushing, seq,
-		flush_tid, oldest_flush_tid, issue_seq, mseq,
-		size, max_size, &mtime, &atime, &ctime, time_warp_seq,
-		uid, gid, mode, xattr_version, xattr_blob,
-		follows, inline_data);
+	ret = send_cap_msg(&arg);
 	if (ret < 0) {
 		dout("error sending cap msg, must requeue %p\n", inode);
 		delayed = 1;
@@ -1227,15 +1259,42 @@ static inline int __send_flush_snap(struct inode *inode,
 				    struct ceph_cap_snap *capsnap,
 				    u32 mseq, u64 oldest_flush_tid)
 {
-	return send_cap_msg(session, ceph_vino(inode).ino, 0,
-			CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
-			capsnap->dirty, 0, capsnap->cap_flush.tid,
-			oldest_flush_tid, 0, mseq, capsnap->size, 0,
-			&capsnap->mtime, &capsnap->atime,
-			&capsnap->ctime, capsnap->time_warp_seq,
-			capsnap->uid, capsnap->gid, capsnap->mode,
-			capsnap->xattr_version, capsnap->xattr_blob,
-			capsnap->follows, capsnap->inline_data);
+	struct cap_msg_args	arg;
+
+	arg.session = session;
+	arg.ino = ceph_vino(inode).ino;
+	arg.cid = 0;
+	arg.follows = capsnap->follows;
+	arg.flush_tid = capsnap->cap_flush.tid;
+	arg.oldest_flush_tid = oldest_flush_tid;
+
+	arg.size = capsnap->size;
+	arg.max_size = 0;
+	arg.xattr_version = capsnap->xattr_version;
+	arg.xattr_buf = capsnap->xattr_blob;
+
+	arg.atime = capsnap->atime;
+	arg.mtime = capsnap->mtime;
+	arg.ctime = capsnap->ctime;
+
+	arg.op = CEPH_CAP_OP_FLUSHSNAP;
+	arg.caps = capsnap->issued;
+	arg.wanted = 0;
+	arg.dirty = capsnap->dirty;
+
+	arg.seq = 0;
+	arg.issue_seq = 0;
+	arg.mseq = mseq;
+	arg.time_warp_seq = capsnap->time_warp_seq;
+
+	arg.uid = capsnap->uid;
+	arg.gid = capsnap->gid;
+	arg.mode = capsnap->mode;
+
+	arg.inline_data = capsnap->inline_data;
+	arg.flags = 0;
+
+	return send_cap_msg(&arg);
 }
 
 /*
@@ -1858,9 +1917,9 @@ ack:
 		sent++;
 
 		/* __send_cap drops i_ceph_lock */
-		delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, cap_used,
-				      want, retain, flushing,
-				      flush_tid, oldest_flush_tid);
+		delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, false,
+				cap_used, want, retain, flushing,
+				flush_tid, oldest_flush_tid);
 		goto retry; /* retake i_ceph_lock and restart our cap scan. */
 	}
 
@@ -1924,9 +1983,9 @@ retry:
 						&flush_tid, &oldest_flush_tid);
 
 		/* __send_cap drops i_ceph_lock */
-		delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
-				     (cap->issued | cap->implemented),
-				     flushing, flush_tid, oldest_flush_tid);
+		delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, true,
+				used, want, (cap->issued | cap->implemented),
+				flushing, flush_tid, oldest_flush_tid);
 
 		if (delayed) {
 			spin_lock(&ci->i_ceph_lock);
@@ -1996,7 +2055,7 @@ static int unsafe_request_wait(struct inode *inode)
 	}
 	spin_unlock(&ci->i_unsafe_lock);
 
-	dout("unsafe_requeset_wait %p wait on tid %llu %llu\n",
+	dout("unsafe_request_wait %p wait on tid %llu %llu\n",
 	     inode, req1 ? req1->r_tid : 0ULL, req2 ? req2->r_tid : 0ULL);
 	if (req1) {
 		ret = !wait_for_completion_timeout(&req1->r_safe_completion,
@@ -2119,7 +2178,7 @@ static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
 			     inode, cap, cf->tid, ceph_cap_string(cf->caps));
 			ci->i_ceph_flags |= CEPH_I_NODELAY;
 			ret = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
-					  __ceph_caps_used(ci),
+					  false, __ceph_caps_used(ci),
 					  __ceph_caps_wanted(ci),
 					  cap->issued | cap->implemented,
 					  cf->caps, cf->tid, oldest_flush_tid);
@@ -2479,6 +2538,27 @@ static void check_max_size(struct inode *inode, loff_t endoff)
 		ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
 }
 
+int ceph_try_get_caps(struct ceph_inode_info *ci, int need, int want, int *got)
+{
+	int ret, err = 0;
+
+	BUG_ON(need & ~CEPH_CAP_FILE_RD);
+	BUG_ON(want & ~(CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
+	ret = ceph_pool_perm_check(ci, need);
+	if (ret < 0)
+		return ret;
+
+	ret = try_get_cap_refs(ci, need, want, 0, true, got, &err);
+	if (ret) {
+		if (err == -EAGAIN) {
+			ret = 0;
+		} else if (err < 0) {
+			ret = err;
+		}
+	}
+	return ret;
+}
+
 /*
  * Wait for caps, and take cap references.  If we can't get a WR cap
  * due to a small max_size, make sure we check_max_size (and possibly
@@ -2507,9 +2587,15 @@ int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
 			if (err < 0)
 				ret = err;
 		} else {
-			ret = wait_event_interruptible(ci->i_cap_wq,
-					try_get_cap_refs(ci, need, want, endoff,
-							 true, &_got, &err));
+			DEFINE_WAIT_FUNC(wait, woken_wake_function);
+			add_wait_queue(&ci->i_cap_wq, &wait);
+
+			while (!try_get_cap_refs(ci, need, want, endoff,
+						 true, &_got, &err))
+				wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
+
+			remove_wait_queue(&ci->i_cap_wq, &wait);
+
 			if (err == -EAGAIN)
 				continue;
 			if (err < 0)
@@ -3570,6 +3656,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
 			cap->cap_id = le64_to_cpu(h->cap_id);
 			cap->mseq = mseq;
 			cap->seq = seq;
+			cap->issue_seq = seq;
 			spin_lock(&session->s_cap_lock);
 			list_add_tail(&cap->session_caps,
 					&session->s_cap_releases);
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 159fc8f1a6a0..045d30d26624 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -454,71 +454,60 @@ enum {
  * only return a short read to the caller if we hit EOF.
  */
 static int striped_read(struct inode *inode,
-			u64 off, u64 len,
+			u64 pos, u64 len,
 			struct page **pages, int num_pages,
-			int *checkeof)
+			int page_align, int *checkeof)
 {
 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
 	struct ceph_inode_info *ci = ceph_inode(inode);
-	u64 pos, this_len, left;
+	u64 this_len;
 	loff_t i_size;
-	int page_align, pages_left;
-	int read, ret;
-	struct page **page_pos;
+	int page_idx;
+	int ret, read = 0;
 	bool hit_stripe, was_short;
 
 	/*
 	 * we may need to do multiple reads.  not atomic, unfortunately.
 	 */
-	pos = off;
-	left = len;
-	page_pos = pages;
-	pages_left = num_pages;
-	read = 0;
-
 more:
-	page_align = pos & ~PAGE_MASK;
-	this_len = left;
+	this_len = len;
+	page_idx = (page_align + read) >> PAGE_SHIFT;
 	ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
 				  &ci->i_layout, pos, &this_len,
-				  ci->i_truncate_seq,
-				  ci->i_truncate_size,
-				  page_pos, pages_left, page_align);
+				  ci->i_truncate_seq, ci->i_truncate_size,
+				  pages + page_idx, num_pages - page_idx,
+				  ((page_align + read) & ~PAGE_MASK));
 	if (ret == -ENOENT)
 		ret = 0;
-	hit_stripe = this_len < left;
+	hit_stripe = this_len < len;
 	was_short = ret >= 0 && ret < this_len;
-	dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
+	dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, len, read,
 	     ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
 
 	i_size = i_size_read(inode);
 	if (ret >= 0) {
-		int didpages;
 		if (was_short && (pos + ret < i_size)) {
 			int zlen = min(this_len - ret, i_size - pos - ret);
-			int zoff = (off & ~PAGE_MASK) + read + ret;
+			int zoff = page_align + read + ret;
 			dout(" zero gap %llu to %llu\n",
-				pos + ret, pos + ret + zlen);
+			     pos + ret, pos + ret + zlen);
 			ceph_zero_page_vector_range(zoff, zlen, pages);
 			ret += zlen;
 		}
 
-		didpages = (page_align + ret) >> PAGE_SHIFT;
+		read += ret;
 		pos += ret;
-		read = pos - off;
-		left -= ret;
-		page_pos += didpages;
-		pages_left -= didpages;
+		len -= ret;
 
 		/* hit stripe and need continue*/
-		if (left && hit_stripe && pos < i_size)
+		if (len && hit_stripe && pos < i_size)
 			goto more;
 	}
 
 	if (read > 0) {
 		ret = read;
 		/* did we bounce off eof? */
-		if (pos + left > i_size)
+		if (pos + len > i_size)
 			*checkeof = CHECK_EOF;
 	}
 
@@ -532,15 +521,16 @@ more:
  *
  * If the read spans object boundary, just do multiple reads.
  */
-static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
-				int *checkeof)
+static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
+			      int *checkeof)
 {
 	struct file *file = iocb->ki_filp;
 	struct inode *inode = file_inode(file);
 	struct page **pages;
 	u64 off = iocb->ki_pos;
-	int num_pages, ret;
-	size_t len = iov_iter_count(i);
+	int num_pages;
+	ssize_t ret;
+	size_t len = iov_iter_count(to);
 
 	dout("sync_read on file %p %llu~%u %s\n", file, off,
 	     (unsigned)len,
@@ -559,35 +549,56 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
 	if (ret < 0)
 		return ret;
 
-	num_pages = calc_pages_for(off, len);
-	pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
-	if (IS_ERR(pages))
-		return PTR_ERR(pages);
-	ret = striped_read(inode, off, len, pages,
-				num_pages, checkeof);
-	if (ret > 0) {
-		int l, k = 0;
-		size_t left = ret;
-
-		while (left) {
-			size_t page_off = off & ~PAGE_MASK;
-			size_t copy = min_t(size_t, left,
-					    PAGE_SIZE - page_off);
-			l = copy_page_to_iter(pages[k++], page_off, copy, i);
-			off += l;
-			left -= l;
-			if (l < copy)
-				break;
+	if (unlikely(to->type & ITER_PIPE)) {
+		size_t page_off;
+		ret = iov_iter_get_pages_alloc(to, &pages, len,
+					       &page_off);
+		if (ret <= 0)
+			return -ENOMEM;
+		num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE);
+
+		ret = striped_read(inode, off, ret, pages, num_pages,
+				   page_off, checkeof);
+		if (ret > 0) {
+			iov_iter_advance(to, ret);
+			off += ret;
+		} else {
+			iov_iter_advance(to, 0);
+		}
+		ceph_put_page_vector(pages, num_pages, false);
+	} else {
+		num_pages = calc_pages_for(off, len);
+		pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
+		if (IS_ERR(pages))
+			return PTR_ERR(pages);
+
+		ret = striped_read(inode, off, len, pages, num_pages,
+				   (off & ~PAGE_MASK), checkeof);
+		if (ret > 0) {
+			int l, k = 0;
+			size_t left = ret;
+
+			while (left) {
+				size_t page_off = off & ~PAGE_MASK;
+				size_t copy = min_t(size_t, left,
+						    PAGE_SIZE - page_off);
+				l = copy_page_to_iter(pages[k++], page_off,
+						      copy, to);
+				off += l;
+				left -= l;
+				if (l < copy)
+					break;
+			}
 		}
+		ceph_release_page_vector(pages, num_pages);
 	}
-	ceph_release_page_vector(pages, num_pages);
 
 	if (off > iocb->ki_pos) {
 		ret = off - iocb->ki_pos;
 		iocb->ki_pos = off;
 	}
 
-	dout("sync_read result %d\n", ret);
+	dout("sync_read result %zd\n", ret);
 	return ret;
 }
 
@@ -849,7 +860,7 @@ void ceph_sync_write_wait(struct inode *inode)
 
 		dout("sync_write_wait on tid %llu (until %llu)\n",
 		     req->r_tid, last_tid);
-		wait_for_completion(&req->r_safe_completion);
+		wait_for_completion(&req->r_done_completion);
 		ceph_osdc_put_request(req);
 
 		spin_lock(&ci->i_unsafe_lock);
@@ -902,7 +913,7 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
 					pos >> PAGE_SHIFT,
 					(pos + count) >> PAGE_SHIFT);
 		if (ret2 < 0)
-			dout("invalidate_inode_pages2_range returned %d\n", ret);
+			dout("invalidate_inode_pages2_range returned %d\n", ret2);
 
 		flags = CEPH_OSD_FLAG_ORDERSNAP |
 			CEPH_OSD_FLAG_ONDISK |
@@ -1245,8 +1256,9 @@ again:
 		dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
 		     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
 		     ceph_cap_string(got));
-
+		current->journal_info = filp;
 		ret = generic_file_read_iter(iocb, to);
+		current->journal_info = NULL;
 	}
 	dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
 	     inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
@@ -1766,6 +1778,7 @@ const struct file_operations ceph_file_fops = {
 	.fsync = ceph_fsync,
 	.lock = ceph_lock,
 	.flock = ceph_flock,
+	.splice_read = generic_file_splice_read,
 	.splice_write = iter_file_splice_write,
 	.unlocked_ioctl = ceph_ioctl,
 	.compat_ioctl	= ceph_ioctl,
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 815acd1a56d4..4f49253387a0 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2100,17 +2100,26 @@ static int __do_request(struct ceph_mds_client *mdsc,
 		err = -EIO;
 		goto finish;
 	}
+	if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
+		if (mdsc->mdsmap_err) {
+			err = mdsc->mdsmap_err;
+			dout("do_request mdsmap err %d\n", err);
+			goto finish;
+		}
+		if (!(mdsc->fsc->mount_options->flags &
+		      CEPH_MOUNT_OPT_MOUNTWAIT) &&
+		    !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
+			err = -ENOENT;
+			pr_info("probably no mds server is up\n");
+			goto finish;
+		}
+	}
 
 	put_request_session(req);
 
 	mds = __choose_mds(mdsc, req);
 	if (mds < 0 ||
 	    ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
-		if (mdsc->mdsmap_err) {
-			err = mdsc->mdsmap_err;
-			dout("do_request mdsmap err %d\n", err);
-			goto finish;
-		}
 		dout("do_request no mds or not active, waiting for map\n");
 		list_add(&req->r_wait, &mdsc->waiting_for_map);
 		goto out;
@@ -3943,13 +3952,13 @@ static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
 }
 
 
-static int verify_authorizer_reply(struct ceph_connection *con, int len)
+static int verify_authorizer_reply(struct ceph_connection *con)
 {
 	struct ceph_mds_session *s = con->private;
 	struct ceph_mds_client *mdsc = s->s_mdsc;
 	struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
 
-	return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
+	return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
 }
 
 static int invalidate_authorizer(struct ceph_connection *con)
diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
index 8c3591a7fbae..5454e2327a5f 100644
--- a/fs/ceph/mdsmap.c
+++ b/fs/ceph/mdsmap.c
@@ -42,6 +42,60 @@ int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m)
 	return i;
 }
 
+#define __decode_and_drop_type(p, end, type, bad)		\
+	do {							\
+		if (*p + sizeof(type) > end)			\
+			goto bad;				\
+		*p += sizeof(type);				\
+	} while (0)
+
+#define __decode_and_drop_set(p, end, type, bad)		\
+	do {							\
+		u32 n;						\
+		size_t need;					\
+		ceph_decode_32_safe(p, end, n, bad);		\
+		need = sizeof(type) * n;			\
+		ceph_decode_need(p, end, need, bad);		\
+		*p += need;					\
+	} while (0)
+
+#define __decode_and_drop_map(p, end, ktype, vtype, bad)	\
+	do {							\
+		u32 n;						\
+		size_t need;					\
+		ceph_decode_32_safe(p, end, n, bad);		\
+		need = (sizeof(ktype) + sizeof(vtype)) * n;	\
+		ceph_decode_need(p, end, need, bad);		\
+		*p += need;					\
+	} while (0)
+
+
+static int __decode_and_drop_compat_set(void **p, void* end)
+{
+	int i;
+	/* compat, ro_compat, incompat*/
+	for (i = 0; i < 3; i++) {
+		u32 n;
+		ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
+		/* mask */
+		*p += sizeof(u64);
+		/* names (map<u64, string>) */
+		n = ceph_decode_32(p);
+		while (n-- > 0) {
+			u32 len;
+			ceph_decode_need(p, end, sizeof(u64) + sizeof(u32),
+					 bad);
+			*p += sizeof(u64);
+			len = ceph_decode_32(p);
+			ceph_decode_need(p, end, len, bad);
+			*p += len;
+		}
+	}
+	return 0;
+bad:
+	return -1;
+}
+
 /*
  * Decode an MDS map
  *
@@ -55,6 +109,7 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 	int i, j, n;
 	int err = -EINVAL;
 	u8 mdsmap_v, mdsmap_cv;
+	u16 mdsmap_ev;
 
 	m = kzalloc(sizeof(*m), GFP_NOFS);
 	if (m == NULL)
@@ -83,7 +138,7 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 
 	m->m_info = kcalloc(m->m_max_mds, sizeof(*m->m_info), GFP_NOFS);
 	if (m->m_info == NULL)
-		goto badmem;
+		goto nomem;
 
 	/* pick out active nodes from mds_info (state > 0) */
 	n = ceph_decode_32(p);
@@ -166,7 +221,7 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 			info->export_targets = kcalloc(num_export_targets,
 						       sizeof(u32), GFP_NOFS);
 			if (info->export_targets == NULL)
-				goto badmem;
+				goto nomem;
 			for (j = 0; j < num_export_targets; j++)
 				info->export_targets[j] =
 				       ceph_decode_32(&pexport_targets);
@@ -180,24 +235,104 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 	m->m_num_data_pg_pools = n;
 	m->m_data_pg_pools = kcalloc(n, sizeof(u64), GFP_NOFS);
 	if (!m->m_data_pg_pools)
-		goto badmem;
+		goto nomem;
 	ceph_decode_need(p, end, sizeof(u64)*(n+1), bad);
 	for (i = 0; i < n; i++)
 		m->m_data_pg_pools[i] = ceph_decode_64(p);
 	m->m_cas_pg_pool = ceph_decode_64(p);
+	m->m_enabled = m->m_epoch > 1;
+
+	mdsmap_ev = 1;
+	if (mdsmap_v >= 2) {
+		ceph_decode_16_safe(p, end, mdsmap_ev, bad_ext);
+	}
+	if (mdsmap_ev >= 3) {
+		if (__decode_and_drop_compat_set(p, end) < 0)
+			goto bad_ext;
+	}
+	/* metadata_pool */
+	if (mdsmap_ev < 5) {
+		__decode_and_drop_type(p, end, u32, bad_ext);
+	} else {
+		__decode_and_drop_type(p, end, u64, bad_ext);
+	}
 
-	/* ok, we don't care about the rest. */
+	/* created + modified + tableserver */
+	__decode_and_drop_type(p, end, struct ceph_timespec, bad_ext);
+	__decode_and_drop_type(p, end, struct ceph_timespec, bad_ext);
+	__decode_and_drop_type(p, end, u32, bad_ext);
+
+	/* in */
+	{
+		int num_laggy = 0;
+		ceph_decode_32_safe(p, end, n, bad_ext);
+		ceph_decode_need(p, end, sizeof(u32) * n, bad_ext);
+
+		for (i = 0; i < n; i++) {
+			s32 mds = ceph_decode_32(p);
+			if (mds >= 0 && mds < m->m_max_mds) {
+				if (m->m_info[mds].laggy)
+					num_laggy++;
+			}
+		}
+		m->m_num_laggy = num_laggy;
+	}
+
+	/* inc */
+	__decode_and_drop_map(p, end, u32, u32, bad_ext);
+	/* up */
+	__decode_and_drop_map(p, end, u32, u64, bad_ext);
+	/* failed */
+	__decode_and_drop_set(p, end, u32, bad_ext);
+	/* stopped */
+	__decode_and_drop_set(p, end, u32, bad_ext);
+
+	if (mdsmap_ev >= 4) {
+		/* last_failure_osd_epoch */
+		__decode_and_drop_type(p, end, u32, bad_ext);
+	}
+	if (mdsmap_ev >= 6) {
+		/* ever_allowed_snaps */
+		__decode_and_drop_type(p, end, u8, bad_ext);
+		/* explicitly_allowed_snaps */
+		__decode_and_drop_type(p, end, u8, bad_ext);
+	}
+	if (mdsmap_ev >= 7) {
+		/* inline_data_enabled */
+		__decode_and_drop_type(p, end, u8, bad_ext);
+	}
+	if (mdsmap_ev >= 8) {
+		u32 name_len;
+		/* enabled */
+		ceph_decode_8_safe(p, end, m->m_enabled, bad_ext);
+		ceph_decode_32_safe(p, end, name_len, bad_ext);
+		ceph_decode_need(p, end, name_len, bad_ext);
+		*p += name_len;
+	}
+	/* damaged */
+	if (mdsmap_ev >= 9) {
+		size_t need;
+		ceph_decode_32_safe(p, end, n, bad_ext);
+		need = sizeof(u32) * n;
+		ceph_decode_need(p, end, need, bad_ext);
+		*p += need;
+		m->m_damaged = n > 0;
+	} else {
+		m->m_damaged = false;
+	}
+bad_ext:
 	*p = end;
 	dout("mdsmap_decode success epoch %u\n", m->m_epoch);
 	return m;
-
-badmem:
+nomem:
 	err = -ENOMEM;
+	goto out_err;
 bad:
 	pr_err("corrupt mdsmap\n");
 	print_hex_dump(KERN_DEBUG, "mdsmap: ",
 		       DUMP_PREFIX_OFFSET, 16, 1,
 		       start, end - start, true);
+out_err:
 	ceph_mdsmap_destroy(m);
 	return ERR_PTR(err);
 }
@@ -212,3 +347,19 @@ void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
 	kfree(m->m_data_pg_pools);
 	kfree(m);
 }
+
+bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m)
+{
+	int i, nr_active = 0;
+	if (!m->m_enabled)
+		return false;
+	if (m->m_damaged)
+		return false;
+	if (m->m_num_laggy > 0)
+		return false;
+	for (i = 0; i < m->m_max_mds; i++) {
+		if (m->m_info[i].state == CEPH_MDS_STATE_ACTIVE)
+			nr_active++;
+	}
+	return nr_active > 0;
+}
diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index 9ff5219d849e..8f8b41c2ef0f 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -593,6 +593,8 @@ int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
 	capsnap->atime = inode->i_atime;
 	capsnap->ctime = inode->i_ctime;
 	capsnap->time_warp_seq = ci->i_time_warp_seq;
+	capsnap->truncate_size = ci->i_truncate_size;
+	capsnap->truncate_seq = ci->i_truncate_seq;
 	if (capsnap->dirty_pages) {
 		dout("finish_cap_snap %p cap_snap %p snapc %p %llu %s s=%llu "
 		     "still has %d dirty pages\n", inode, capsnap,
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index f2f76696ddca..6bd20d707bfd 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -137,6 +137,8 @@ enum {
 	Opt_nofscache,
 	Opt_poolperm,
 	Opt_nopoolperm,
+	Opt_require_active_mds,
+	Opt_norequire_active_mds,
 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 	Opt_acl,
 #endif
@@ -171,6 +173,8 @@ static match_table_t fsopt_tokens = {
 	{Opt_nofscache, "nofsc"},
 	{Opt_poolperm, "poolperm"},
 	{Opt_nopoolperm, "nopoolperm"},
+	{Opt_require_active_mds, "require_active_mds"},
+	{Opt_norequire_active_mds, "norequire_active_mds"},
 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 	{Opt_acl, "acl"},
 #endif
@@ -287,6 +291,12 @@ static int parse_fsopt_token(char *c, void *private)
 	case Opt_nopoolperm:
 		fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 		break;
+	case Opt_require_active_mds:
+		fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
+		break;
+	case Opt_norequire_active_mds:
+		fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
+		break;
 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 	case Opt_acl:
 		fsopt->sb_flags |= MS_POSIXACL;
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 931687f71a7c..3373b61faefd 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -36,6 +36,7 @@
 #define CEPH_MOUNT_OPT_DCACHE          (1<<9) /* use dcache for readdir etc */
 #define CEPH_MOUNT_OPT_FSCACHE         (1<<10) /* use fscache */
 #define CEPH_MOUNT_OPT_NOPOOLPERM      (1<<11) /* no pool permission check */
+#define CEPH_MOUNT_OPT_MOUNTWAIT       (1<<12) /* mount waits if no mds is up */
 
 #define CEPH_MOUNT_OPT_DEFAULT    CEPH_MOUNT_OPT_DCACHE
 
@@ -180,6 +181,8 @@ struct ceph_cap_snap {
 	u64 size;
 	struct timespec mtime, atime, ctime;
 	u64 time_warp_seq;
+	u64 truncate_size;
+	u32 truncate_seq;
 	int writing;   /* a sync write is still in progress */
 	int dirty_pages;     /* dirty pages awaiting writeback */
 	bool inline_data;
@@ -905,6 +908,8 @@ extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
 
 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
 			 loff_t endoff, int *got, struct page **pinned_page);
+extern int ceph_try_get_caps(struct ceph_inode_info *ci,
+			     int need, int want, int *got);
 
 /* for counting open files by mode */
 extern void __ceph_get_fmode(struct ceph_inode_info *ci, int mode);