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btrfs: sysfs: add debugging exports

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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 <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-06-13 17:23:02 +02:00
parent 6a9fb468f1
commit 6e369febbc
1 changed files with 32 additions and 0 deletions
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32
fs/btrfs/sysfs.c
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@ -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: