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failslab: simplify debugfs initialization 

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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2011-07-26 16:09:02 -07:00 committed by Linus Torvalds
parent 7f5ddcc8d3
commit 810f09b87b
1 changed files with 10 additions and 21 deletions
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31
mm/failslab.c
View File

@ -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);
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;
failslab.cache_filter_file =
debugfs_create_bool("cache-filter", mode, dir,
&failslab.cache_filter);
return 0;
fail:
cleanup_fault_attr_dentries(&failslab.attr);
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 err;
return -ENOMEM;
}
late_initcall(failslab_debugfs_init);