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fault-injection: add ability to export fault_attr in arbitrary directory

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init_fault_attr_dentries() is used to export fault_attr via debugfs.
But it can only export it in debugfs root directory.

Per Forlin is working on mmc_fail_request which adds support to inject
data errors after a completed host transfer in MMC subsystem.

The fault_attr for mmc_fail_request should be defined per mmc host and
export it in debugfs directory per mmc host like
/sys/kernel/debug/mmc0/mmc_fail_request.

init_fault_attr_dentries() doesn't help for mmc_fail_request.  So this
introduces fault_create_debugfs_attr() which is able to create a
directory in the arbitrary directory and replace
init_fault_attr_dentries().

[[email protected]: extraneous semicolon, per Randy]
Signed-off-by: Akinobu Mita <[email protected]>
Tested-by: Per Forlin <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Matt Mackall <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Akinobu Mita 2011-08-03 16:21:01 -07:00 • committed by Linus Torvalds
commit dd48c085c1
7 changed files with 33 additions and 46 deletions
Download patch file Download diff file Expand all files Collapse all files

14
mm/failslab.c
View file

@ -34,23 +34,23 @@ __setup("failslab=", setup_failslab);
#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
static int __init failslab_debugfs_init(void)
{
struct dentry *dir;
mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
int err;
err = init_fault_attr_dentries(&failslab.attr, "failslab");
if (err)
return err;
dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
if (IS_ERR(dir))
return PTR_ERR(dir);
if (!debugfs_create_bool("ignore-gfp-wait", mode, failslab.attr.dir,
if (!debugfs_create_bool("ignore-gfp-wait", mode, dir,
&failslab.ignore_gfp_wait))
goto fail;
if (!debugfs_create_bool("cache-filter", mode, failslab.attr.dir,
if (!debugfs_create_bool("cache-filter", mode, dir,
&failslab.cache_filter))
goto fail;
return 0;
fail:
cleanup_fault_attr_dentries(&failslab.attr);
debugfs_remove_recursive(dir);
return -ENOMEM;
}

13
mm/page_alloc.c
View file

@ -1409,14 +1409,11 @@ static int __init fail_page_alloc_debugfs(void)
{
mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
struct dentry *dir;
int err;
err = init_fault_attr_dentries(&fail_page_alloc.attr,
"fail_page_alloc");
if (err)
return err;
dir = fail_page_alloc.attr.dir;
dir = fault_create_debugfs_attr("fail_page_alloc", NULL,
&fail_page_alloc.attr);
if (IS_ERR(dir))
return PTR_ERR(dir);
if (!debugfs_create_bool("ignore-gfp-wait", mode, dir,
&fail_page_alloc.ignore_gfp_wait))
@ -1430,7 +1427,7 @@ static int __init fail_page_alloc_debugfs(void)
return 0;
fail:
cleanup_fault_attr_dentries(&fail_page_alloc.attr);
debugfs_remove_recursive(dir);
return -ENOMEM;
}