mirror of https://gitee.com/openkylin/linux.git
nilfs2: add /sys/fs/nilfs2/<device> group
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
Linus Torvalds
parent
aebe17f684
commit
da7141fb78
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@ -12,3 +12,47 @@ Date: April 2014
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Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
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Description:
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Describe attributes of /sys/fs/nilfs2/features group.
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What: /sys/fs/nilfs2/<device>/revision
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Date: April 2014
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Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
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Description:
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Show NILFS file system revision on volume.
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This value informs about metadata structures'
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revision on mounted volume.
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What: /sys/fs/nilfs2/<device>/blocksize
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Date: April 2014
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Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
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Description:
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Show volume's block size in bytes.
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What: /sys/fs/nilfs2/<device>/device_size
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Date: April 2014
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Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
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Description:
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Show volume size in bytes.
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What: /sys/fs/nilfs2/<device>/free_blocks
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Date: April 2014
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Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
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Description:
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Show count of free blocks on volume.
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What: /sys/fs/nilfs2/<device>/uuid
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Date: April 2014
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Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
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Description:
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Show volume's UUID (Universally Unique Identifier).
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What: /sys/fs/nilfs2/<device>/volume_name
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Date: April 2014
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Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
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Description:
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Show volume's label.
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What: /sys/fs/nilfs2/<device>/README
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Date: April 2014
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Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
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Description:
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Describe attributes of /sys/fs/nilfs2/<device> group.
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@ -41,6 +41,174 @@ static struct kset *nilfs_kset;
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count; \
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})
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/************************************************************************
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* NILFS device attrs *
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************************************************************************/
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static
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ssize_t nilfs_dev_revision_show(struct nilfs_dev_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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struct nilfs_super_block **sbp = nilfs->ns_sbp;
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u32 major = le32_to_cpu(sbp[0]->s_rev_level);
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u16 minor = le16_to_cpu(sbp[0]->s_minor_rev_level);
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return snprintf(buf, PAGE_SIZE, "%d.%d\n", major, minor);
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}
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static
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ssize_t nilfs_dev_blocksize_show(struct nilfs_dev_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%u\n", nilfs->ns_blocksize);
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}
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static
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ssize_t nilfs_dev_device_size_show(struct nilfs_dev_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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struct nilfs_super_block **sbp = nilfs->ns_sbp;
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u64 dev_size = le64_to_cpu(sbp[0]->s_dev_size);
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return snprintf(buf, PAGE_SIZE, "%llu\n", dev_size);
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}
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static
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ssize_t nilfs_dev_free_blocks_show(struct nilfs_dev_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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sector_t free_blocks = 0;
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nilfs_count_free_blocks(nilfs, &free_blocks);
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)free_blocks);
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}
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static
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ssize_t nilfs_dev_uuid_show(struct nilfs_dev_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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struct nilfs_super_block **sbp = nilfs->ns_sbp;
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return snprintf(buf, PAGE_SIZE, "%pUb\n", sbp[0]->s_uuid);
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}
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static
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ssize_t nilfs_dev_volume_name_show(struct nilfs_dev_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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struct nilfs_super_block **sbp = nilfs->ns_sbp;
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return scnprintf(buf, sizeof(sbp[0]->s_volume_name), "%s\n",
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sbp[0]->s_volume_name);
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}
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static const char dev_readme_str[] =
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"The <device> group contains attributes that describe file system\n"
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"partition's details.\n\n"
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"(1) revision\n\tshow NILFS file system revision.\n\n"
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"(2) blocksize\n\tshow volume block size in bytes.\n\n"
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"(3) device_size\n\tshow volume size in bytes.\n\n"
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"(4) free_blocks\n\tshow count of free blocks on volume.\n\n"
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"(5) uuid\n\tshow volume's UUID.\n\n"
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"(6) volume_name\n\tshow volume's name.\n\n";
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static ssize_t nilfs_dev_README_show(struct nilfs_dev_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, dev_readme_str);
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}
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NILFS_DEV_RO_ATTR(revision);
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NILFS_DEV_RO_ATTR(blocksize);
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NILFS_DEV_RO_ATTR(device_size);
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NILFS_DEV_RO_ATTR(free_blocks);
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NILFS_DEV_RO_ATTR(uuid);
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NILFS_DEV_RO_ATTR(volume_name);
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NILFS_DEV_RO_ATTR(README);
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static struct attribute *nilfs_dev_attrs[] = {
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NILFS_DEV_ATTR_LIST(revision),
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NILFS_DEV_ATTR_LIST(blocksize),
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NILFS_DEV_ATTR_LIST(device_size),
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NILFS_DEV_ATTR_LIST(free_blocks),
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NILFS_DEV_ATTR_LIST(uuid),
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NILFS_DEV_ATTR_LIST(volume_name),
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NILFS_DEV_ATTR_LIST(README),
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NULL,
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};
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static ssize_t nilfs_dev_attr_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
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ns_dev_kobj);
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struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
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attr);
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return a->show ? a->show(a, nilfs, buf) : 0;
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}
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static ssize_t nilfs_dev_attr_store(struct kobject *kobj,
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struct attribute *attr,
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const char *buf, size_t len)
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{
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struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
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ns_dev_kobj);
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struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
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attr);
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return a->store ? a->store(a, nilfs, buf, len) : 0;
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}
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static void nilfs_dev_attr_release(struct kobject *kobj)
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{
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struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
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ns_dev_kobj);
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complete(&nilfs->ns_dev_kobj_unregister);
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}
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static const struct sysfs_ops nilfs_dev_attr_ops = {
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.show = nilfs_dev_attr_show,
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.store = nilfs_dev_attr_store,
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};
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static struct kobj_type nilfs_dev_ktype = {
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.default_attrs = nilfs_dev_attrs,
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.sysfs_ops = &nilfs_dev_attr_ops,
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.release = nilfs_dev_attr_release,
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};
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int nilfs_sysfs_create_device_group(struct super_block *sb)
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{
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struct the_nilfs *nilfs = sb->s_fs_info;
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int err;
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nilfs->ns_dev_kobj.kset = nilfs_kset;
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init_completion(&nilfs->ns_dev_kobj_unregister);
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err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL,
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"%s", sb->s_id);
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if (err)
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goto failed_create_device_group;
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return 0;
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failed_create_device_group:
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return err;
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}
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void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
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{
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kobject_del(&nilfs->ns_dev_kobj);
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}
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/************************************************************************
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* NILFS feature attrs *
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************************************************************************/
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@ -35,6 +35,17 @@ struct nilfs_##name##_attr { \
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NILFS_COMMON_ATTR_STRUCT(feature);
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#define NILFS_DEV_ATTR_STRUCT(name) \
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struct nilfs_##name##_attr { \
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struct attribute attr; \
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ssize_t (*show)(struct nilfs_##name##_attr *, struct the_nilfs *, \
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char *); \
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ssize_t (*store)(struct nilfs_##name##_attr *, struct the_nilfs *, \
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const char *, size_t); \
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};
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NILFS_DEV_ATTR_STRUCT(dev);
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#define NILFS_ATTR(type, name, mode, show, store) \
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static struct nilfs_##type##_attr nilfs_##type##_attr_##name = \
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__ATTR(name, mode, show, store)
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@ -55,7 +66,16 @@ NILFS_COMMON_ATTR_STRUCT(feature);
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#define NILFS_FEATURE_RW_ATTR(name) \
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NILFS_RW_ATTR(feature, name)
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#define NILFS_DEV_INFO_ATTR(name) \
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NILFS_INFO_ATTR(dev, name)
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#define NILFS_DEV_RO_ATTR(name) \
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NILFS_RO_ATTR(dev, name)
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#define NILFS_DEV_RW_ATTR(name) \
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NILFS_RW_ATTR(dev, name)
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#define NILFS_FEATURE_ATTR_LIST(name) \
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(&nilfs_feature_attr_##name.attr)
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#define NILFS_DEV_ATTR_LIST(name) \
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(&nilfs_dev_attr_##name.attr)
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#endif /* _NILFS_SYSFS_H */
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@ -95,6 +95,8 @@ enum {
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* @ns_inode_size: size of on-disk inode
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* @ns_first_ino: first not-special inode number
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* @ns_crc_seed: seed value of CRC32 calculation
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* @ns_dev_kobj: /sys/fs/<nilfs>/<device>
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* @ns_dev_kobj_unregister: completion state
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*/
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struct the_nilfs {
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unsigned long ns_flags;
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@ -188,6 +190,10 @@ struct the_nilfs {
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int ns_inode_size;
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int ns_first_ino;
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u32 ns_crc_seed;
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/* /sys/fs/<nilfs>/<device> */
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struct kobject ns_dev_kobj;
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struct completion ns_dev_kobj_unregister;
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};
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#define THE_NILFS_FNS(bit, name) \
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