diff options
| -rw-r--r-- | fs/btrfs/sysfs.c | 81 |
1 files changed, 65 insertions, 16 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 79be4a187..832cf62 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -28,29 +28,53 @@ #include "transaction.h" #include "sysfs.h" -static void btrfs_release_super_kobj(struct kobject *kobj); -static struct kobj_type btrfs_ktype = { - .sysfs_ops = &kobj_sysfs_ops, - .release = btrfs_release_super_kobj, -}; +static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); -static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) +static u64 get_features(struct btrfs_fs_info *fs_info, + enum btrfs_feature_set set) { - if (kobj->ktype != &btrfs_ktype) - return NULL; - return container_of(kobj, struct btrfs_fs_info, super_kobj); + struct btrfs_super_block *disk_super = fs_info->super_copy; + if (set == FEAT_COMPAT) + return btrfs_super_compat_flags(disk_super); + else if (set == FEAT_COMPAT_RO) + return btrfs_super_compat_ro_flags(disk_super); + else + return btrfs_super_incompat_flags(disk_super); } -static void btrfs_release_super_kobj(struct kobject *kobj) +static ssize_t btrfs_feature_attr_show(struct kobject *kobj, + struct kobj_attribute *a, char *buf) { + int val = 0; struct btrfs_fs_info *fs_info = to_fs_info(kobj); - complete(&fs_info->kobj_unregister); + if (fs_info) { + struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); + u64 features = get_features(fs_info, fa->feature_set); + if (features & fa->feature_bit) + val = 1; + } + + return snprintf(buf, PAGE_SIZE, "%d\n", val); } -static ssize_t btrfs_feature_attr_show(struct kobject *kobj, - struct kobj_attribute *a, char *buf) +static umode_t btrfs_feature_visible(struct kobject *kobj, + struct attribute *attr, int unused) { - return snprintf(buf, PAGE_SIZE, "0\n"); + struct btrfs_fs_info *fs_info = to_fs_info(kobj); + umode_t mode = attr->mode; + + if (fs_info) { + struct btrfs_feature_attr *fa; + u64 features; + + fa = attr_to_btrfs_feature_attr(attr); + features = get_features(fs_info, fa->feature_set); + + if (!(features & fa->feature_bit)) + mode = 0; + } + + return mode; } BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); @@ -78,11 +102,27 @@ static struct attribute *btrfs_supported_feature_attrs[] = { static const struct attribute_group btrfs_feature_attr_group = { .name = "features", + .is_visible = btrfs_feature_visible, .attrs = btrfs_supported_feature_attrs, }; -/* /sys/fs/btrfs/ entry */ -static struct kset *btrfs_kset; +static void btrfs_release_super_kobj(struct kobject *kobj) +{ + struct btrfs_fs_info *fs_info = to_fs_info(kobj); + complete(&fs_info->kobj_unregister); +} + +static struct kobj_type btrfs_ktype = { + .sysfs_ops = &kobj_sysfs_ops, + .release = btrfs_release_super_kobj, +}; + +static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) +{ + if (kobj->ktype != &btrfs_ktype) + return NULL; + return container_of(kobj, struct btrfs_fs_info, super_kobj); +} void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) { @@ -91,13 +131,22 @@ void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) wait_for_completion(&fs_info->kobj_unregister); } +/* /sys/fs/btrfs/ entry */ +static struct kset *btrfs_kset; + int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) { int error; init_completion(&fs_info->kobj_unregister); + fs_info->super_kobj.kset = btrfs_kset; error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, "%pU", fs_info->fsid); + + error = sysfs_create_group(&fs_info->super_kobj, + &btrfs_feature_attr_group); + if (error) + btrfs_sysfs_remove_one(fs_info); return error; } |
