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-rw-r--r--fs/ceph/addr.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 23bb0ce..aa3cd7c 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;
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