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authorDavid Sterba <dsterba@suse.cz>2014-05-07 16:17:16 (GMT)
committerChris Mason <clm@fb.com>2014-06-10 00:20:28 (GMT)
commitdf93589a17378277c0ac394858dd8a2a41e5fb5a (patch)
treeebdd7bf8a7dc21bfa662ffbc77674d8adda6e7c3 /fs
parent80a773fbfc2d6b5b2478377e8ac271d495f55e73 (diff)
downloadlinux-df93589a17378277c0ac394858dd8a2a41e5fb5a.tar.xz
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: David Sterba <dsterba@suse.cz> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/sysfs.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index c5eb214..ba2a645 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,
};