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Subject[PATCH 4/7] fault-injection: use debugfs_remove_recursive
Date
Use debugfs_remove_recursive() to simplify initialization and
deinitialization of fault injection debugfs files.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
---
include/linux/fault-inject.h | 18 +------
lib/fault-inject.c | 115 ++++++++++--------------------------------
mm/failslab.c | 2 +-
mm/page_alloc.c | 2 +-
4 files changed, 30 insertions(+), 107 deletions(-)

diff --git a/include/linux/fault-inject.h b/include/linux/fault-inject.h
index 7b72328..a842db6 100644
--- a/include/linux/fault-inject.h
+++ b/include/linux/fault-inject.h
@@ -27,23 +27,7 @@ struct fault_attr {
unsigned long count;

#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
-
- struct {
- struct dentry *dir;
-
- struct dentry *probability_file;
- struct dentry *interval_file;
- struct dentry *times_file;
- struct dentry *space_file;
- struct dentry *verbose_file;
- struct dentry *task_filter_file;
- struct dentry *stacktrace_depth_file;
- struct dentry *require_start_file;
- struct dentry *require_end_file;
- struct dentry *reject_start_file;
- struct dentry *reject_end_file;
- } dentries;
-
+ struct dentry *dir;
#endif
};

diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index 882fd3b..2577b12 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -199,48 +199,7 @@ static struct dentry *debugfs_create_atomic_t(const char *name, mode_t mode,

void cleanup_fault_attr_dentries(struct fault_attr *attr)
{
- debugfs_remove(attr->dentries.probability_file);
- attr->dentries.probability_file = NULL;
-
- debugfs_remove(attr->dentries.interval_file);
- attr->dentries.interval_file = NULL;
-
- debugfs_remove(attr->dentries.times_file);
- attr->dentries.times_file = NULL;
-
- debugfs_remove(attr->dentries.space_file);
- attr->dentries.space_file = NULL;
-
- debugfs_remove(attr->dentries.verbose_file);
- attr->dentries.verbose_file = NULL;
-
- debugfs_remove(attr->dentries.task_filter_file);
- attr->dentries.task_filter_file = NULL;
-
-#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
-
- debugfs_remove(attr->dentries.stacktrace_depth_file);
- attr->dentries.stacktrace_depth_file = NULL;
-
- debugfs_remove(attr->dentries.require_start_file);
- attr->dentries.require_start_file = NULL;
-
- debugfs_remove(attr->dentries.require_end_file);
- attr->dentries.require_end_file = NULL;
-
- debugfs_remove(attr->dentries.reject_start_file);
- attr->dentries.reject_start_file = NULL;
-
- debugfs_remove(attr->dentries.reject_end_file);
- attr->dentries.reject_end_file = NULL;
-
-#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
-
- if (attr->dentries.dir)
- WARN_ON(!simple_empty(attr->dentries.dir));
-
- debugfs_remove(attr->dentries.dir);
- attr->dentries.dir = NULL;
+ debugfs_remove_recursive(attr->dir);
}

int init_fault_attr_dentries(struct fault_attr *attr, const char *name)
@@ -248,66 +207,46 @@ int init_fault_attr_dentries(struct fault_attr *attr, const char *name)
mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
struct dentry *dir;

- memset(&attr->dentries, 0, sizeof(attr->dentries));
-
dir = debugfs_create_dir(name, NULL);
if (!dir)
- goto fail;
- attr->dentries.dir = dir;
-
- attr->dentries.probability_file =
- debugfs_create_ul("probability", mode, dir, &attr->probability);
+ return -ENOMEM;

- attr->dentries.interval_file =
- debugfs_create_ul("interval", mode, dir, &attr->interval);
+ attr->dir = dir;

- attr->dentries.times_file =
- debugfs_create_atomic_t("times", mode, dir, &attr->times);
-
- attr->dentries.space_file =
- debugfs_create_atomic_t("space", mode, dir, &attr->space);
-
- attr->dentries.verbose_file =
- debugfs_create_ul("verbose", mode, dir, &attr->verbose);
-
- attr->dentries.task_filter_file = debugfs_create_bool("task-filter",
- mode, dir, &attr->task_filter);
-
- if (!attr->dentries.probability_file || !attr->dentries.interval_file ||
- !attr->dentries.times_file || !attr->dentries.space_file ||
- !attr->dentries.verbose_file || !attr->dentries.task_filter_file)
+ if (!debugfs_create_ul("probability", mode, dir, &attr->probability))
+ goto fail;
+ if (!debugfs_create_ul("interval", mode, dir, &attr->interval))
+ goto fail;
+ if (!debugfs_create_atomic_t("times", mode, dir, &attr->times))
+ goto fail;
+ if (!debugfs_create_atomic_t("space", mode, dir, &attr->space))
+ goto fail;
+ if (!debugfs_create_ul("verbose", mode, dir, &attr->verbose))
+ goto fail;
+ if (!debugfs_create_bool("task-filter", mode, dir, &attr->task_filter))
goto fail;

#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER

- attr->dentries.stacktrace_depth_file =
- debugfs_create_stacktrace_depth(
- "stacktrace-depth", mode, dir, &attr->stacktrace_depth);
-
- attr->dentries.require_start_file =
- debugfs_create_ul("require-start", mode, dir, &attr->require_start);
-
- attr->dentries.require_end_file =
- debugfs_create_ul("require-end", mode, dir, &attr->require_end);
-
- attr->dentries.reject_start_file =
- debugfs_create_ul("reject-start", mode, dir, &attr->reject_start);
-
- attr->dentries.reject_end_file =
- debugfs_create_ul("reject-end", mode, dir, &attr->reject_end);
-
- if (!attr->dentries.stacktrace_depth_file ||
- !attr->dentries.require_start_file ||
- !attr->dentries.require_end_file ||
- !attr->dentries.reject_start_file ||
- !attr->dentries.reject_end_file)
+ if (!debugfs_create_stacktrace_depth("stacktrace-depth", mode, dir,
+ &attr->stacktrace_depth))
+ goto fail;
+ if (!debugfs_create_ul("require-start", mode, dir,
+ &attr->require_start))
+ goto fail;
+ if (!debugfs_create_ul("require-end", mode, dir, &attr->require_end))
+ goto fail;
+ if (!debugfs_create_ul("reject-start", mode, dir, &attr->reject_start))
+ goto fail;
+ if (!debugfs_create_ul("reject-end", mode, dir, &attr->reject_end))
goto fail;

#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */

return 0;
fail:
- cleanup_fault_attr_dentries(attr);
+ debugfs_remove_recursive(attr->dir);
+
return -ENOMEM;
}

diff --git a/mm/failslab.c b/mm/failslab.c
index c5f88f2..7df9f7f 100644
--- a/mm/failslab.c
+++ b/mm/failslab.c
@@ -45,7 +45,7 @@ static int __init failslab_debugfs_init(void)
err = init_fault_attr_dentries(&failslab.attr, "failslab");
if (err)
return err;
- dir = failslab.attr.dentries.dir;
+ dir = failslab.attr.dir;

failslab.ignore_gfp_wait_file =
debugfs_create_bool("ignore-gfp-wait", mode, dir,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4e8985a..71159b2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1424,7 +1424,7 @@ static int __init fail_page_alloc_debugfs(void)
"fail_page_alloc");
if (err)
return err;
- dir = fail_page_alloc.attr.dentries.dir;
+ dir = fail_page_alloc.attr.dir;

fail_page_alloc.ignore_gfp_wait_file =
debugfs_create_bool("ignore-gfp-wait", mode, dir,
--
1.7.4.4


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