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bdi: convert bdi_debug_register to int

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Convert bdi_debug_register to int and then do error handle for it.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
weiping zhang 2017-10-31 18:37:54 +08:00 committed by Jens Axboe
parent 0192f17529
commit 97f0769793
1 changed files with 15 additions and 2 deletions
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17
mm/backing-dev.c
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@ -113,11 +113,23 @@ static const struct file_operations bdi_debug_stats_fops = {
.release = single_release, .release = single_release,
}; };
static void bdi_debug_register(struct backing_dev_info *bdi, const char *name) static int bdi_debug_register(struct backing_dev_info *bdi, const char *name)
{ {
if (!bdi_debug_root)
return -ENOMEM;
bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root); bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root);
if (!bdi->debug_dir)
return -ENOMEM;
bdi->debug_stats = debugfs_create_file("stats", 0444, bdi->debug_dir, bdi->debug_stats = debugfs_create_file("stats", 0444, bdi->debug_dir,
bdi, &bdi_debug_stats_fops); bdi, &bdi_debug_stats_fops);
if (!bdi->debug_stats) {
debugfs_remove(bdi->debug_dir);
return -ENOMEM;
}
return 0;
} }
static void bdi_debug_unregister(struct backing_dev_info *bdi) static void bdi_debug_unregister(struct backing_dev_info *bdi)
@ -129,9 +141,10 @@ static void bdi_debug_unregister(struct backing_dev_info *bdi)
static inline void bdi_debug_init(void) static inline void bdi_debug_init(void)
{ {
} }
static inline void bdi_debug_register(struct backing_dev_info *bdi, static inline int bdi_debug_register(struct backing_dev_info *bdi,
const char *name) const char *name)
{ {
return 0;
} }
static inline void bdi_debug_unregister(struct backing_dev_info *bdi) static inline void bdi_debug_unregister(struct backing_dev_info *bdi)
{ {