Commit 6e369feb authored by David Sterba's avatar David Sterba
Browse files

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: default avatarDavid Sterba <dsterba@suse.com>
parent 6a9fb468

fs/btrfs/sysfs.c

+32 −0
Original line number Diff line number Diff line
@@ -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:

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