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| author | David Sterba <dsterba@suse.com> | 2019-10-07 11:11:03 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-11-18 17:51:43 +0100 |
| commit | f7cea56c0fff95bd5a6cd21b9fa299f66193b604 (patch) | |
| tree | e59752010527d9314d500aec9542f17c98279092 /fs/btrfs/sysfs.c | |
| parent | 3831bf0094abed51e71cbeca8b6edf8b88c2644b (diff) | |
| download | linux-f7cea56c0fff95bd5a6cd21b9fa299f66193b604.tar.bz2 | |
btrfs: sysfs: export supported checksums
Export supported checksum algorithms via sysfs in the list of static
features:
/sys/fs/btrfs/features/supported_checksums
Space spearated list of checksum algorithm names.
Co-developed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/sysfs.c')
| -rw-r--r-- | fs/btrfs/sysfs.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index f6d3c80f2e28..41eb6a313bf8 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -295,8 +295,30 @@ static ssize_t rmdir_subvol_show(struct kobject *kobj, } BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); +static ssize_t supported_checksums_show(struct kobject *kobj, + struct kobj_attribute *a, char *buf) +{ + ssize_t ret = 0; + int i; + + for (i = 0; i < btrfs_get_num_csums(); i++) { + /* + * This "trick" only works as long as 'enum btrfs_csum_type' has + * no holes in it + */ + ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s%s", + (i == 0 ? "" : " "), btrfs_super_csum_name(i)); + + } + + ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n"); + return ret; +} +BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); + static struct attribute *btrfs_supported_static_feature_attrs[] = { BTRFS_ATTR_PTR(static_feature, rmdir_subvol), + BTRFS_ATTR_PTR(static_feature, supported_checksums), NULL }; |