[PATCH] splice: redo page lookup if add_to_page_cache() returns -EEXIST

This can happen quite easily, if several processes are trying to splice the same file at the same time. It's not a failure, it just means someone raced with us in allocating this file page. So just dump the allocated page and relookup the original. Signed-off-by: Jens Axboe <axboe@suse.de>
git-mirror · May 4, 2006 · a054887 · a054887
1 parent 76ad4d1
commit a054887
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/fs/splice.c b/fs/splice.c
@@ -324,6 +324,8 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
 					      mapping_gfp_mask(mapping));
 			if (unlikely(error)) {
 				page_cache_release(page);
+				if (error == -EEXIST)
+					continue;
 				break;
 			}
 			/*