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nilfs2: add /sys/fs/nilfs2/<device> group

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This patch adds creation of /sys/fs/nilfs2/<device> group.

The <device> group contains attributes that describe file
system partition's details:
(1) revision - show NILFS file system revision.
(2) blocksize - show volume block size in bytes.
(3) device_size - show volume size in bytes.
(4) free_blocks - show count of free blocks on volume.
(5) uuid - show volume's UUID.
(6) volume_name - show volume's name.

Signed-off-by: Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com>
Cc: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Michael L. Semon <mlsemon35@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vyacheslav Dubeyko 2014-08-08 14:20:39 -07:00 committed by Linus Torvalds
parent aebe17f684
commit da7141fb78
4 changed files with 238 additions and 0 deletions
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44
Documentation/ABI/testing/sysfs-fs-nilfs2
View File

@ -12,3 +12,47 @@ Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Describe attributes of /sys/fs/nilfs2/features group.
What: /sys/fs/nilfs2/<device>/revision
Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Show NILFS file system revision on volume.
This value informs about metadata structures'
revision on mounted volume.
What: /sys/fs/nilfs2/<device>/blocksize
Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Show volume's block size in bytes.
What: /sys/fs/nilfs2/<device>/device_size
Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Show volume size in bytes.
What: /sys/fs/nilfs2/<device>/free_blocks
Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Show count of free blocks on volume.
What: /sys/fs/nilfs2/<device>/uuid
Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Show volume's UUID (Universally Unique Identifier).
What: /sys/fs/nilfs2/<device>/volume_name
Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Show volume's label.
What: /sys/fs/nilfs2/<device>/README
Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Describe attributes of /sys/fs/nilfs2/<device> group.

168
fs/nilfs2/sysfs.c
View File

@ -41,6 +41,174 @@ static struct kset *nilfs_kset;
count; \
})
/************************************************************************
* NILFS device attrs *
************************************************************************/
static
ssize_t nilfs_dev_revision_show(struct nilfs_dev_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
struct nilfs_super_block **sbp = nilfs->ns_sbp;
u32 major = le32_to_cpu(sbp[0]->s_rev_level);
u16 minor = le16_to_cpu(sbp[0]->s_minor_rev_level);
return snprintf(buf, PAGE_SIZE, "%d.%d\n", major, minor);
}
static
ssize_t nilfs_dev_blocksize_show(struct nilfs_dev_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%u\n", nilfs->ns_blocksize);
}
static
ssize_t nilfs_dev_device_size_show(struct nilfs_dev_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
struct nilfs_super_block **sbp = nilfs->ns_sbp;
u64 dev_size = le64_to_cpu(sbp[0]->s_dev_size);
return snprintf(buf, PAGE_SIZE, "%llu\n", dev_size);
}
static
ssize_t nilfs_dev_free_blocks_show(struct nilfs_dev_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
sector_t free_blocks = 0;
nilfs_count_free_blocks(nilfs, &free_blocks);
return snprintf(buf, PAGE_SIZE, "%llu\n",
(unsigned long long)free_blocks);
}
static
ssize_t nilfs_dev_uuid_show(struct nilfs_dev_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
struct nilfs_super_block **sbp = nilfs->ns_sbp;
return snprintf(buf, PAGE_SIZE, "%pUb\n", sbp[0]->s_uuid);
}
static
ssize_t nilfs_dev_volume_name_show(struct nilfs_dev_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
struct nilfs_super_block **sbp = nilfs->ns_sbp;
return scnprintf(buf, sizeof(sbp[0]->s_volume_name), "%s\n",
sbp[0]->s_volume_name);
}
static const char dev_readme_str[] =
"The <device> group contains attributes that describe file system\n"
"partition's details.\n\n"
"(1) revision\n\tshow NILFS file system revision.\n\n"
"(2) blocksize\n\tshow volume block size in bytes.\n\n"
"(3) device_size\n\tshow volume size in bytes.\n\n"
"(4) free_blocks\n\tshow count of free blocks on volume.\n\n"
"(5) uuid\n\tshow volume's UUID.\n\n"
"(6) volume_name\n\tshow volume's name.\n\n";
static ssize_t nilfs_dev_README_show(struct nilfs_dev_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
return snprintf(buf, PAGE_SIZE, dev_readme_str);
}
NILFS_DEV_RO_ATTR(revision);
NILFS_DEV_RO_ATTR(blocksize);
NILFS_DEV_RO_ATTR(device_size);
NILFS_DEV_RO_ATTR(free_blocks);
NILFS_DEV_RO_ATTR(uuid);
NILFS_DEV_RO_ATTR(volume_name);
NILFS_DEV_RO_ATTR(README);
static struct attribute *nilfs_dev_attrs[] = {
NILFS_DEV_ATTR_LIST(revision),
NILFS_DEV_ATTR_LIST(blocksize),
NILFS_DEV_ATTR_LIST(device_size),
NILFS_DEV_ATTR_LIST(free_blocks),
NILFS_DEV_ATTR_LIST(uuid),
NILFS_DEV_ATTR_LIST(volume_name),
NILFS_DEV_ATTR_LIST(README),
NULL,
};
static ssize_t nilfs_dev_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
ns_dev_kobj);
struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
attr);
return a->show ? a->show(a, nilfs, buf) : 0;
}
static ssize_t nilfs_dev_attr_store(struct kobject *kobj,
struct attribute *attr,
const char *buf, size_t len)
{
struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
ns_dev_kobj);
struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
attr);
return a->store ? a->store(a, nilfs, buf, len) : 0;
}
static void nilfs_dev_attr_release(struct kobject *kobj)
{
struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
ns_dev_kobj);
complete(&nilfs->ns_dev_kobj_unregister);
}
static const struct sysfs_ops nilfs_dev_attr_ops = {
.show = nilfs_dev_attr_show,
.store = nilfs_dev_attr_store,
};
static struct kobj_type nilfs_dev_ktype = {
.default_attrs = nilfs_dev_attrs,
.sysfs_ops = &nilfs_dev_attr_ops,
.release = nilfs_dev_attr_release,
};
int nilfs_sysfs_create_device_group(struct super_block *sb)
{
struct the_nilfs *nilfs = sb->s_fs_info;
int err;
nilfs->ns_dev_kobj.kset = nilfs_kset;
init_completion(&nilfs->ns_dev_kobj_unregister);
err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL,
"%s", sb->s_id);
if (err)
goto failed_create_device_group;
return 0;
failed_create_device_group:
return err;
}
void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
{
kobject_del(&nilfs->ns_dev_kobj);
}
/************************************************************************
* NILFS feature attrs *
************************************************************************/

20
fs/nilfs2/sysfs.h
View File

@ -35,6 +35,17 @@ struct nilfs_##name##_attr { \
NILFS_COMMON_ATTR_STRUCT(feature);
#define NILFS_DEV_ATTR_STRUCT(name) \
struct nilfs_##name##_attr { \
struct attribute attr; \
ssize_t (*show)(struct nilfs_##name##_attr *, struct the_nilfs *, \
char *); \
ssize_t (*store)(struct nilfs_##name##_attr *, struct the_nilfs *, \
const char *, size_t); \
};
NILFS_DEV_ATTR_STRUCT(dev);
#define NILFS_ATTR(type, name, mode, show, store) \
static struct nilfs_##type##_attr nilfs_##type##_attr_##name = \
__ATTR(name, mode, show, store)
@ -55,7 +66,16 @@ NILFS_COMMON_ATTR_STRUCT(feature);
#define NILFS_FEATURE_RW_ATTR(name) \
NILFS_RW_ATTR(feature, name)
#define NILFS_DEV_INFO_ATTR(name) \
NILFS_INFO_ATTR(dev, name)
#define NILFS_DEV_RO_ATTR(name) \
NILFS_RO_ATTR(dev, name)
#define NILFS_DEV_RW_ATTR(name) \
NILFS_RW_ATTR(dev, name)
#define NILFS_FEATURE_ATTR_LIST(name) \
(&nilfs_feature_attr_##name.attr)
#define NILFS_DEV_ATTR_LIST(name) \
(&nilfs_dev_attr_##name.attr)
#endif /* _NILFS_SYSFS_H */

6
fs/nilfs2/the_nilfs.h
View File

@ -95,6 +95,8 @@ enum {
* @ns_inode_size: size of on-disk inode
* @ns_first_ino: first not-special inode number
* @ns_crc_seed: seed value of CRC32 calculation
* @ns_dev_kobj: /sys/fs/<nilfs>/<device>
* @ns_dev_kobj_unregister: completion state
*/
struct the_nilfs {
unsigned long ns_flags;
@ -188,6 +190,10 @@ struct the_nilfs {
int ns_inode_size;
int ns_first_ino;
u32 ns_crc_seed;
/* /sys/fs/<nilfs>/<device> */
struct kobject ns_dev_kobj;
struct completion ns_dev_kobj_unregister;
};
#define THE_NILFS_FNS(bit, name) \