1 files changed, 9 insertions, 2 deletions

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 23bb0ceabe31..aa3cd7cc3e40 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -5,6 +5,7 @@
 #include <linux/mm.h>
 #include <linux/pagemap.h>
 #include <linux/writeback.h>    /* generic_writepages */
+#include <linux/slab.h>
 #include <linux/pagevec.h>
 #include <linux/task_io_accounting_ops.h>
 
@@ -919,6 +920,10 @@ static int context_is_writeable_or_written(struct inode *inode,
 /*
  * We are only allowed to write into/dirty the page if the page is
  * clean, or already dirty within the same snap context.
+ *
+ * called with page locked.
+ * return success with page locked,
+ * or any failure (incl -EAGAIN) with page unlocked.
  */
 static int ceph_update_writeable_page(struct file *file,
                             loff_t pos, unsigned len,
@@ -961,9 +966,11 @@ retry_locked:
                         snapc = ceph_get_snap_context((void *)page->private);
                         unlock_page(page);
                         ceph_queue_writeback(inode);
-                        wait_event_interruptible(ci->i_cap_wq,
+                        r = wait_event_interruptible(ci->i_cap_wq,
                                context_is_writeable_or_written(inode, snapc));
                         ceph_put_snap_context(snapc);
+                        if (r == -ERESTARTSYS)
+                                return r;
                         return -EAGAIN;
                 }
 
@@ -1035,7 +1042,7 @@ static int ceph_write_begin(struct file *file, struct address_space *mapping,
         int r;
 
         do {
-                /* get a page*/
+                /* get a page */
                 page = grab_cache_page_write_begin(mapping, index, 0);
                 if (!page)
                         return -ENOMEM;