From df93589a17378277c0ac394858dd8a2a41e5fb5a Mon Sep 17 00:00:00 2001 From: David Sterba Date: Wed, 7 May 2014 18:17:16 +0200 Subject: [PATCH] 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 Signed-off-by: Chris Mason --- fs/btrfs/sysfs.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) 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, }; -- 2.7.4