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Subject[PATCH 5/7] failslab: simplify debugfs initialization
Date
Now cleanup_fault_attr_dentries() recursively removes a directory,
So we can simplify the error handling in the initialization code
and no need to hold dentry structs for each debugfs file.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: linux-mm@kvack.org
---
mm/failslab.c | 31 ++++++++++---------------------
1 files changed, 10 insertions(+), 21 deletions(-)
diff --git a/mm/failslab.c b/mm/failslab.c
index 7df9f7f..1ce58c2 100644
--- a/mm/failslab.c
+++ b/mm/failslab.c
@@ -5,10 +5,6 @@ static struct {
struct fault_attr attr;
u32 ignore_gfp_wait;
int cache_filter;
-#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
- struct dentry *ignore_gfp_wait_file;
- struct dentry *cache_filter_file;
-#endif
} failslab = {
.attr = FAULT_ATTR_INITIALIZER,
.ignore_gfp_wait = 1,
@@ -39,31 +35,24 @@ __setup("failslab=", setup_failslab);
static int __init failslab_debugfs_init(void)
{
mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
- struct dentry *dir;
int err;

err = init_fault_attr_dentries(&failslab.attr, "failslab");
if (err)
return err;
- dir = failslab.attr.dir;
-
- failslab.ignore_gfp_wait_file =
- debugfs_create_bool("ignore-gfp-wait", mode, dir,
- &failslab.ignore_gfp_wait);

- failslab.cache_filter_file =
- debugfs_create_bool("cache-filter", mode, dir,
- &failslab.cache_filter);
+ if (!debugfs_create_bool("ignore-gfp-wait", mode, failslab.attr.dir,
+ &failslab.ignore_gfp_wait))
+ goto fail;
+ if (!debugfs_create_bool("cache-filter", mode, failslab.attr.dir,
+ &failslab.cache_filter))
+ goto fail;

- if (!failslab.ignore_gfp_wait_file ||
- !failslab.cache_filter_file) {
- err = -ENOMEM;
- debugfs_remove(failslab.cache_filter_file);
- debugfs_remove(failslab.ignore_gfp_wait_file);
- cleanup_fault_attr_dentries(&failslab.attr);
- }
+ return 0;
+fail:
+ cleanup_fault_attr_dentries(&failslab.attr);

- return err;
+ return -ENOMEM;
}

late_initcall(failslab_debugfs_init);
--
1.7.4.4


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