Commit df93589a authored by David Sterba's avatar David Sterba Committed by Chris Mason
Browse files

btrfs: export more from FS_INFO to sysfs 



Similar to the FS_INFO updates, export the basic filesystem info through
sysfs: node size, sector size and clone alignment.

Signed-off-by: default avatarDavid Sterba <dsterba@suse.cz>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 80a773fb

fs/btrfs/sysfs.c

+40 −0
Original line number Diff line number Diff line
@@ -396,8 +396,48 @@ static ssize_t btrfs_label_store(struct kobject *kobj, 
}

BTRFS_ATTR_RW(label, 0644, btrfs_label_show, btrfs_label_store);



static ssize_t btrfs_no_store(struct kobject *kobj,

				 struct kobj_attribute *a,

				 const char *buf, size_t len)

{

	return -EPERM;

}



static ssize_t btrfs_nodesize_show(struct kobject *kobj,

				struct kobj_attribute *a, char *buf)

{

	struct btrfs_fs_info *fs_info = to_fs_info(kobj);



	return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);

}



BTRFS_ATTR_RW(nodesize, 0444, btrfs_nodesize_show, btrfs_no_store);



static ssize_t btrfs_sectorsize_show(struct kobject *kobj,

				struct kobj_attribute *a, char *buf)

{

	struct btrfs_fs_info *fs_info = to_fs_info(kobj);



	return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);

}



BTRFS_ATTR_RW(sectorsize, 0444, btrfs_sectorsize_show, btrfs_no_store);



static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,

				struct kobj_attribute *a, char *buf)

{

	struct btrfs_fs_info *fs_info = to_fs_info(kobj);



	return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);

}



BTRFS_ATTR_RW(clone_alignment, 0444, btrfs_clone_alignment_show, btrfs_no_store);



static struct attribute *btrfs_attrs[] = {

	BTRFS_ATTR_PTR(label),

	BTRFS_ATTR_PTR(nodesize),

	BTRFS_ATTR_PTR(sectorsize),

	BTRFS_ATTR_PTR(clone_alignment),

	NULL,

};