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nilfs2: add /sys/fs/nilfs2/<device>/mounted_snapshots/<snapshot> group
This patch adds creation of <snapshot> group for every mounted snapshot in /sys/fs/nilfs2/<device>/mounted_snapshots group. The group contains details about mounted snapshot: (1) inodes_count - show number of inodes for snapshot. (2) blocks_count - show number of blocks for snapshot. 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>
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@ -248,3 +248,22 @@ Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
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Description:
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Describe content of /sys/fs/nilfs2/<device>/mounted_snapshots
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group.
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What: /sys/fs/nilfs2/<device>/mounted_snapshots/<id>/inodes_count
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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 number of inodes for snapshot.
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What: /sys/fs/nilfs2/<device>/mounted_snapshots/<id>/blocks_count
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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 number of blocks for snapshot.
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What: /sys/fs/nilfs2/<device>/mounted_snapshots/<id>/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>/mounted_snapshots/<id>
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group.
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@ -111,6 +111,124 @@ void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \
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kobject_del(&nilfs->ns_##parent_name##_subgroups->sg_##name##_kobj); \
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}
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/************************************************************************
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* NILFS snapshot attrs *
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************************************************************************/
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static ssize_t
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nilfs_snapshot_inodes_count_show(struct nilfs_snapshot_attr *attr,
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struct nilfs_root *root, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)atomic64_read(&root->inodes_count));
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}
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static ssize_t
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nilfs_snapshot_blocks_count_show(struct nilfs_snapshot_attr *attr,
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struct nilfs_root *root, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)atomic64_read(&root->blocks_count));
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}
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static const char snapshot_readme_str[] =
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"The group contains details about mounted snapshot.\n\n"
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"(1) inodes_count\n\tshow number of inodes for snapshot.\n\n"
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"(2) blocks_count\n\tshow number of blocks for snapshot.\n\n";
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static ssize_t
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nilfs_snapshot_README_show(struct nilfs_snapshot_attr *attr,
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struct nilfs_root *root, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, snapshot_readme_str);
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}
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NILFS_SNAPSHOT_RO_ATTR(inodes_count);
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NILFS_SNAPSHOT_RO_ATTR(blocks_count);
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NILFS_SNAPSHOT_RO_ATTR(README);
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static struct attribute *nilfs_snapshot_attrs[] = {
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NILFS_SNAPSHOT_ATTR_LIST(inodes_count),
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NILFS_SNAPSHOT_ATTR_LIST(blocks_count),
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NILFS_SNAPSHOT_ATTR_LIST(README),
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NULL,
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};
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static ssize_t nilfs_snapshot_attr_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct nilfs_root *root =
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container_of(kobj, struct nilfs_root, snapshot_kobj);
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struct nilfs_snapshot_attr *a =
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container_of(attr, struct nilfs_snapshot_attr, attr);
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return a->show ? a->show(a, root, buf) : 0;
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}
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static ssize_t nilfs_snapshot_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 nilfs_root *root =
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container_of(kobj, struct nilfs_root, snapshot_kobj);
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struct nilfs_snapshot_attr *a =
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container_of(attr, struct nilfs_snapshot_attr, attr);
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return a->store ? a->store(a, root, buf, len) : 0;
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}
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static void nilfs_snapshot_attr_release(struct kobject *kobj)
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{
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struct nilfs_root *root = container_of(kobj, struct nilfs_root,
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snapshot_kobj);
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complete(&root->snapshot_kobj_unregister);
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}
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static const struct sysfs_ops nilfs_snapshot_attr_ops = {
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.show = nilfs_snapshot_attr_show,
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.store = nilfs_snapshot_attr_store,
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};
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static struct kobj_type nilfs_snapshot_ktype = {
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.default_attrs = nilfs_snapshot_attrs,
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.sysfs_ops = &nilfs_snapshot_attr_ops,
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.release = nilfs_snapshot_attr_release,
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};
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int nilfs_sysfs_create_snapshot_group(struct nilfs_root *root)
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{
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struct the_nilfs *nilfs;
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struct kobject *parent;
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int err;
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nilfs = root->nilfs;
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parent = &nilfs->ns_dev_subgroups->sg_mounted_snapshots_kobj;
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root->snapshot_kobj.kset = nilfs_kset;
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init_completion(&root->snapshot_kobj_unregister);
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if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
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err = kobject_init_and_add(&root->snapshot_kobj,
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&nilfs_snapshot_ktype,
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&nilfs->ns_dev_kobj,
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"current_checkpoint");
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} else {
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err = kobject_init_and_add(&root->snapshot_kobj,
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&nilfs_snapshot_ktype,
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parent,
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"%llu", root->cno);
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}
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if (err)
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return err;
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return 0;
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}
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void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *root)
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{
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kobject_del(&root->snapshot_kobj);
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}
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/************************************************************************
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* NILFS mounted snapshots attrs *
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************************************************************************/
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@ -86,6 +86,17 @@ NILFS_DEV_ATTR_STRUCT(checkpoints);
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NILFS_DEV_ATTR_STRUCT(superblock);
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NILFS_DEV_ATTR_STRUCT(segctor);
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#define NILFS_CP_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 nilfs_root *, \
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char *); \
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ssize_t (*store)(struct nilfs_##name##_attr *, struct nilfs_root *, \
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const char *, size_t); \
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};
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NILFS_CP_ATTR_STRUCT(snapshot);
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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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@ -126,6 +137,13 @@ NILFS_DEV_ATTR_STRUCT(segctor);
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#define NILFS_CHECKPOINTS_RW_ATTR(name) \
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NILFS_RW_ATTR(checkpoints, name)
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#define NILFS_SNAPSHOT_INFO_ATTR(name) \
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NILFS_INFO_ATTR(snapshot, name)
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#define NILFS_SNAPSHOT_RO_ATTR(name) \
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NILFS_RO_ATTR(snapshot, name)
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#define NILFS_SNAPSHOT_RW_ATTR(name) \
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NILFS_RW_ATTR(snapshot, name)
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#define NILFS_SUPERBLOCK_RO_ATTR(name) \
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NILFS_RO_ATTR(superblock, name)
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#define NILFS_SUPERBLOCK_RW_ATTR(name) \
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@ -148,6 +166,8 @@ NILFS_DEV_ATTR_STRUCT(segctor);
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(&nilfs_mounted_snapshots_attr_##name.attr)
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#define NILFS_CHECKPOINTS_ATTR_LIST(name) \
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(&nilfs_checkpoints_attr_##name.attr)
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#define NILFS_SNAPSHOT_ATTR_LIST(name) \
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(&nilfs_snapshot_attr_##name.attr)
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#define NILFS_SUPERBLOCK_ATTR_LIST(name) \
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(&nilfs_superblock_attr_##name.attr)
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#define NILFS_SEGCTOR_ATTR_LIST(name) \
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@ -243,6 +243,8 @@ THE_NILFS_FNS(SB_DIRTY, sb_dirty)
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* @ifile: inode file
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* @inodes_count: number of inodes
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* @blocks_count: number of blocks
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* @snapshot_kobj: /sys/fs/<nilfs>/<device>/mounted_snapshots/<snapshot>
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* @snapshot_kobj_unregister: completion state for kernel object
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*/
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struct nilfs_root {
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__u64 cno;
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@ -254,6 +256,10 @@ struct nilfs_root {
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atomic64_t inodes_count;
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atomic64_t blocks_count;
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/* /sys/fs/<nilfs>/<device>/mounted_snapshots/<snapshot> */
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struct kobject snapshot_kobj;
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struct completion snapshot_kobj_unregister;
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};
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/* Special checkpoint number */
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