mm/filemap.c: enable error injection at add_to_page_cache()

Recently I messed up the error handling in filemap_fault() because of an unexpected ENOMEM (related to cgroup memory limits) in add_to_page_cache. Enable error injection at this point so I can add a testcase to xfstests to verify I don't mess this up again. [[email protected]: include linux/error-injection.h] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Josef Bacik <[email protected]> Reviewed-by: William Kucharski <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
heikomat · May 14, 2019 · cfcbfb1 · cfcbfb1
1 parent c6d2341
commit cfcbfb1
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/mm/filemap.c b/mm/filemap.c
@@ -24,6 +24,7 @@
 #include <linux/pagemap.h>
 #include <linux/file.h>
 #include <linux/uio.h>
+#include <linux/error-injection.h>
 #include <linux/hash.h>
 #include <linux/writeback.h>
 #include <linux/backing-dev.h>
@@ -882,6 +883,7 @@ static int __add_to_page_cache_locked(struct page *page,
 	put_page(page);
 	return xas_error(&xas);
 }
+ALLOW_ERROR_INJECTION(__add_to_page_cache_locked, ERRNO);
 
 /**
  * add_to_page_cache_locked - add a locked page to the pagecache