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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-11 08:50:05 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-11 08:50:05 +0100 |
| commit | 73cf7e111ed69d8e1b59a3ae41b14bc77215e9ee (patch) | |
| tree | 02cd3308d328bce9cf97bf2c1c9d5e932103ebfe /mm/backing-dev.c | |
| parent | 328257099077e8affd438c179d8a938948de2e7f (diff) | |
| parent | 50c4c4e268a2d7a3e58ebb698ac74da0de40ae36 (diff) | |
Merge 4.15-rc3 into driver-core-next
We want the fixes and changes in here for testing.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/backing-dev.c')
| -rw-r--r-- | mm/backing-dev.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 74b52dfd5852..84b2dc76f140 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) { @@ -869,10 +882,13 @@ int bdi_register_va(struct backing_dev_info *bdi, const char *fmt, va_list args) if (IS_ERR(dev)) return PTR_ERR(dev); + if (bdi_debug_register(bdi, dev_name(dev))) { + device_destroy(bdi_class, dev->devt); + return -ENOMEM; + } cgwb_bdi_register(bdi); bdi->dev = dev; - bdi_debug_register(bdi, dev_name(dev)); set_bit(WB_registered, &bdi->wb.state); spin_lock_bh(&bdi_lock); |