From 6e369febbc534596b5e366d46f10b65bb4caa544 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Thu, 13 Jun 2019 17:23:02 +0200 Subject: btrfs: sysfs: add debugging exports Add 'debug' directories to global sysfs and per-filesystem. This will replace the debugfs directory. The sysfs location is simpler and builds on top of the existing file hierarchy so there will hopefully be no more questions about the sample debugfs file. The directory is called 'debug' and only present under CONFIG_BTRFS_DEBUG so this will not affect productions builds. Signed-off-by: David Sterba --- fs/btrfs/sysfs.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 271e7e714920..315204557bfc 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -248,6 +248,25 @@ static const struct attribute_group btrfs_static_feature_attr_group = { .attrs = btrfs_supported_static_feature_attrs, }; +#ifdef CONFIG_BTRFS_DEBUG + +/* + * Runtime debugging exported via sysfs + * + * /sys/fs/btrfs/debug - applies to module or all filesystems + * /sys/fs/btrfs/UUID - applies only to the given filesystem + */ +static struct attribute *btrfs_debug_feature_attrs[] = { + NULL +}; + +static const struct attribute_group btrfs_debug_feature_attr_group = { + .name = "debug", + .attrs = btrfs_debug_feature_attrs, +}; + +#endif + static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) { u64 val; @@ -860,6 +879,13 @@ int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) if (error) goto failure; +#ifdef CONFIG_BTRFS_DEBUG + error = sysfs_create_group(fsid_kobj, + &btrfs_debug_feature_attr_group); + if (error) + goto failure; +#endif + error = addrm_unknown_feature_attrs(fs_info, true); if (error) goto failure; @@ -952,6 +978,12 @@ int __init btrfs_init_sysfs(void) if (ret) goto out_remove_group; +#ifdef CONFIG_BTRFS_DEBUG + ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); + if (ret) + goto out2; +#endif + return 0; out_remove_group: -- cgit v1.2.3