diff options
| author | weiping zhang <zhangweiping@didichuxing.com> | 2017-10-31 18:37:54 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-11-19 11:02:13 -0700 |
| commit | 97f07697932e6faf2a708f7aef7cba8e6b0cab96 (patch) | |
| tree | ec10aec46015360c8f753e068f58f179f421b886 | |
| parent | 0192f17529fa3f8d78ca0181a2b2aaa7cbb0784d (diff) | |
bdi: convert bdi_debug_register to int
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>
| -rw-r--r-- | mm/backing-dev.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 74b52dfd5852..b5f940ce0143 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -113,11 +113,23 @@ static const struct file_operations bdi_debug_stats_fops = { .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); + if (!bdi->debug_dir) + return -ENOMEM; + bdi->debug_stats = debugfs_create_file("stats", 0444, bdi->debug_dir, 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) @@ -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_register(struct backing_dev_info *bdi, +static inline int bdi_debug_register(struct backing_dev_info *bdi, const char *name) { + return 0; } static inline void bdi_debug_unregister(struct backing_dev_info *bdi) { |