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| author | Anand Jain <anand.jain@oracle.com> | 2020-10-07 15:20:03 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-12-07 16:23:59 +0100 |
| commit | 089c8b0551f46e1c44269c10b0576e031e942acd (patch) | |
| tree | 4f75c66c9938fa444de329592d29721c2775a509 /fs/btrfs/sysfs.c | |
| parent | 0477e92881850d44910a7e94fc2c46f96faa131f (diff) | |
| download | linux-089c8b0551f46e1c44269c10b0576e031e942acd.tar.bz2 | |
btrfs: sysfs: export filesystem generation
Matching with the information that's available from the ioctl
FS_INFO, add generation to the per-filesystem directory
/sys/fs/btrfs/UUID/generation, which could be used by scripts.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/sysfs.c')
| -rw-r--r-- | fs/btrfs/sysfs.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 279d9262b676..8424f5d0e5ed 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -854,6 +854,15 @@ static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj, } BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show); +static ssize_t btrfs_generation_show(struct kobject *kobj, + struct kobj_attribute *a, char *buf) +{ + struct btrfs_fs_info *fs_info = to_fs_info(kobj); + + return scnprintf(buf, PAGE_SIZE, "%llu\n", fs_info->generation); +} +BTRFS_ATTR(, generation, btrfs_generation_show); + static const struct attribute *btrfs_attrs[] = { BTRFS_ATTR_PTR(, label), BTRFS_ATTR_PTR(, nodesize), @@ -863,6 +872,7 @@ static const struct attribute *btrfs_attrs[] = { BTRFS_ATTR_PTR(, metadata_uuid), BTRFS_ATTR_PTR(, checksum), BTRFS_ATTR_PTR(, exclusive_operation), + BTRFS_ATTR_PTR(, generation), NULL, }; |