fs/ubifs/sysfs.c

Source file repositories/reference/linux-study-clean/fs/ubifs/sysfs.c

File Facts

System
Linux kernel
Corpus path
fs/ubifs/sysfs.c
Extension
.c
Size
3296 bytes
Lines
157
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct ubifs_attr {
	struct attribute attr;
	enum attr_id_t attr_id;
};

#define UBIFS_ATTR(_name, _mode, _id)					\
static struct ubifs_attr ubifs_attr_##_name = {				\
	.attr = {.name = __stringify(_name), .mode = _mode },		\
	.attr_id = attr_##_id,						\
}

#define UBIFS_ATTR_FUNC(_name, _mode) UBIFS_ATTR(_name, _mode, _name)

UBIFS_ATTR_FUNC(errors_magic, 0444);
UBIFS_ATTR_FUNC(errors_crc, 0444);
UBIFS_ATTR_FUNC(errors_node, 0444);

#define ATTR_LIST(name) (&ubifs_attr_##name.attr)

static struct attribute *ubifs_attrs[] = {
	ATTR_LIST(errors_magic),
	ATTR_LIST(errors_node),
	ATTR_LIST(errors_crc),
	NULL,
};
ATTRIBUTE_GROUPS(ubifs);

static ssize_t ubifs_attr_show(struct kobject *kobj,
			       struct attribute *attr, char *buf)
{
	struct ubifs_info *sbi = container_of(kobj, struct ubifs_info,
					      kobj);

	struct ubifs_attr *a = container_of(attr, struct ubifs_attr, attr);

	switch (a->attr_id) {
	case attr_errors_magic:
		return sysfs_emit(buf, "%u\n", sbi->stats->magic_errors);
	case attr_errors_node:
		return sysfs_emit(buf, "%u\n", sbi->stats->node_errors);
	case attr_errors_crc:
		return sysfs_emit(buf, "%u\n", sbi->stats->crc_errors);
	}
	return 0;
};

static void ubifs_sb_release(struct kobject *kobj)
{
	struct ubifs_info *c = container_of(kobj, struct ubifs_info, kobj);

	complete(&c->kobj_unregister);
}

static const struct sysfs_ops ubifs_attr_ops = {
	.show	= ubifs_attr_show,
};

static const struct kobj_type ubifs_sb_ktype = {
	.default_groups	= ubifs_groups,
	.sysfs_ops	= &ubifs_attr_ops,
	.release	= ubifs_sb_release,
};

static const struct kobj_type ubifs_ktype = {
	.sysfs_ops	= &ubifs_attr_ops,
};

static struct kset ubifs_kset = {
	.kobj	= {.ktype = &ubifs_ktype},
};

int ubifs_sysfs_register(struct ubifs_info *c)
{
	int ret, n;
	char dfs_dir_name[UBIFS_DFS_DIR_LEN];

	c->stats = kzalloc_obj(struct ubifs_stats_info);
	if (!c->stats) {
		ret = -ENOMEM;
		goto out_last;
	}
	n = snprintf(dfs_dir_name, UBIFS_DFS_DIR_LEN, UBIFS_DFS_DIR_NAME,
		     c->vi.ubi_num, c->vi.vol_id);

	if (n >= UBIFS_DFS_DIR_LEN) {
		/* The array size is too small */
		ret = -EINVAL;
		goto out_free;
	}

Annotation

Implementation Notes