[PATCH] Honour AOP_TRUNCATE_PAGE returns in page_symlink

As prepare_write, commit_write and readpage are allowed to return
AOP_TRUNCATE_PAGE, page_symlink should respond to them.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 14 insertions, 2 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 1baf1b06fe47..712dfc77793b 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2627,16 +2627,27 @@ int __page_symlink(struct inode *inode, const char *symname, int len,
         int err = -ENOMEM;
         char *kaddr;
 
+retry:
         page = find_or_create_page(mapping, 0, gfp_mask);
         if (!page)
                 goto fail;
         err = mapping->a_ops->prepare_write(NULL, page, 0, len-1);
+        if (err == AOP_TRUNCATED_PAGE) {
+                page_cache_release(page);
+                goto retry;
+        }
         if (err)
                 goto fail_map;
         kaddr = kmap_atomic(page, KM_USER0);
         memcpy(kaddr, symname, len-1);
         kunmap_atomic(kaddr, KM_USER0);
-        mapping->a_ops->commit_write(NULL, page, 0, len-1);
+        err = mapping->a_ops->commit_write(NULL, page, 0, len-1);
+        if (err == AOP_TRUNCATED_PAGE) {
+                page_cache_release(page);
+                goto retry;
+        }
+        if (err)
+                goto fail_map;
         /*
          * Notice that we are _not_ going to block here - end of page is
          * unmapped, so this will only try to map the rest of page, see
@@ -2646,7 +2657,8 @@ int __page_symlink(struct inode *inode, const char *symname, int len,
          */
         if (!PageUptodate(page)) {
                 err = mapping->a_ops->readpage(NULL, page);
-                wait_on_page_locked(page);
+                if (err != AOP_TRUNCATED_PAGE)
+                        wait_on_page_locked(page);
         } else {
                 unlock_page(page);
         }