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btrfs: sysfs: show temp_fsid feature
This adds sysfs objects to indicate temp_fsid feature support and its status. /sys/fs/btrfs/features/temp_fsid /sys/fs/btrfs/<UUID>/temp_fsid For example: Consider two cloned and mounted devices. $ blkid /dev/sdc[1-2] /dev/sdc1: UUID="509ad44b-ad2a-4a8a-bc8d-fe69db7220d5" .. /dev/sdc2: UUID="509ad44b-ad2a-4a8a-bc8d-fe69db7220d5" .. One gets actual fsid, and the other gets the temp_fsid when mounted. $ btrfs filesystem show -m Label: none uuid: 509ad44b-ad2a-4a8a-bc8d-fe69db7220d5 Total devices 1 FS bytes used 54.14MiB devid 1 size 300.00MiB used 144.00MiB path /dev/sdc1 Label: none uuid: 33bad74e-c91b-43a5-aef8-b3cab97ae63a Total devices 1 FS bytes used 54.14MiB devid 1 size 300.00MiB used 144.00MiB path /dev/sdc2 Their sysfs as below. $ cat /sys/fs/btrfs/features/temp_fsid 0 $ cat /sys/fs/btrfs/509ad44b-ad2a-4a8a-bc8d-fe69db7220d5/temp_fsid 0 $ cat /sys/fs/btrfs/33bad74e-c91b-43a5-aef8-b3cab97ae63a/temp_fsid 1 Signed-off-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
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1 changed files with 18 additions and 0 deletions
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@ -425,6 +425,13 @@ static ssize_t acl_show(struct kobject *kobj, struct kobj_attribute *a, char *bu
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}
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BTRFS_ATTR(static_feature, acl, acl_show);
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static ssize_t temp_fsid_supported_show(struct kobject *kobj,
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struct kobj_attribute *a, char *buf)
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{
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return sysfs_emit(buf, "0\n");
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}
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BTRFS_ATTR(static_feature, temp_fsid, temp_fsid_supported_show);
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/*
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* Features which only depend on kernel version.
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*
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@ -438,6 +445,7 @@ static struct attribute *btrfs_supported_static_feature_attrs[] = {
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BTRFS_ATTR_PTR(static_feature, send_stream_version),
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BTRFS_ATTR_PTR(static_feature, supported_rescue_options),
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BTRFS_ATTR_PTR(static_feature, supported_sectorsizes),
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BTRFS_ATTR_PTR(static_feature, temp_fsid),
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NULL
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};
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@ -1205,6 +1213,15 @@ static ssize_t btrfs_generation_show(struct kobject *kobj,
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}
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BTRFS_ATTR(, generation, btrfs_generation_show);
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static ssize_t btrfs_temp_fsid_show(struct kobject *kobj,
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struct kobj_attribute *a, char *buf)
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{
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struct btrfs_fs_info *fs_info = to_fs_info(kobj);
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return sysfs_emit(buf, "%d\n", fs_info->fs_devices->temp_fsid);
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}
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BTRFS_ATTR(, temp_fsid, btrfs_temp_fsid_show);
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static const char * const btrfs_read_policy_name[] = { "pid" };
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static ssize_t btrfs_read_policy_show(struct kobject *kobj,
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@ -1307,6 +1324,7 @@ static const struct attribute *btrfs_attrs[] = {
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BTRFS_ATTR_PTR(, read_policy),
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BTRFS_ATTR_PTR(, bg_reclaim_threshold),
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BTRFS_ATTR_PTR(, commit_stats),
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BTRFS_ATTR_PTR(, temp_fsid),
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NULL,
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};
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