Similar to the FS_INFO updates, export the basic filesystem info through
sysfs: node size, sector size and clone alignment.
Signed-off-by: David Sterba <dsterba@suse.cz>
---
fs/btrfs/sysfs.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index c5eb2143dc66..ba2a645dee07 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -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,
};
--
1.7.9
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