[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>

diff --git a/fs/namei.c b/fs/namei.c
index 1baf1b0..712dfc7 100644 (file)
--- 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);
        }