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author | Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com> | 2014-08-08 14:20:52 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-08 15:57:21 -0700 |
commit | a5a7332a291b55beb0863b119816d12ffc04dfb0 (patch) | |
tree | 4c217b1629b4f6931e68dcc9abf790f0fa682119 /fs | |
parent | a2ecb791a9d6e71a2d37d66034475a92ebc7e02c (diff) | |
download | linux-4.9-exynos9110-a5a7332a291b55beb0863b119816d12ffc04dfb0.tar.gz linux-4.9-exynos9110-a5a7332a291b55beb0863b119816d12ffc04dfb0.tar.bz2 linux-4.9-exynos9110-a5a7332a291b55beb0863b119816d12ffc04dfb0.zip |
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>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/nilfs2/sysfs.c | 118 | ||||
-rw-r--r-- | fs/nilfs2/sysfs.h | 20 | ||||
-rw-r--r-- | fs/nilfs2/the_nilfs.h | 6 |
3 files changed, 144 insertions, 0 deletions
diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c index fc0c961d486a..0f6148c8121a 100644 --- a/fs/nilfs2/sysfs.c +++ b/fs/nilfs2/sysfs.c @@ -112,6 +112,124 @@ void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \ } /************************************************************************ + * NILFS snapshot attrs * + ************************************************************************/ + +static ssize_t +nilfs_snapshot_inodes_count_show(struct nilfs_snapshot_attr *attr, + struct nilfs_root *root, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%llu\n", + (unsigned long long)atomic64_read(&root->inodes_count)); +} + +static ssize_t +nilfs_snapshot_blocks_count_show(struct nilfs_snapshot_attr *attr, + struct nilfs_root *root, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%llu\n", + (unsigned long long)atomic64_read(&root->blocks_count)); +} + +static const char snapshot_readme_str[] = + "The group contains details about mounted snapshot.\n\n" + "(1) inodes_count\n\tshow number of inodes for snapshot.\n\n" + "(2) blocks_count\n\tshow number of blocks for snapshot.\n\n"; + +static ssize_t +nilfs_snapshot_README_show(struct nilfs_snapshot_attr *attr, + struct nilfs_root *root, char *buf) +{ + return snprintf(buf, PAGE_SIZE, snapshot_readme_str); +} + +NILFS_SNAPSHOT_RO_ATTR(inodes_count); +NILFS_SNAPSHOT_RO_ATTR(blocks_count); +NILFS_SNAPSHOT_RO_ATTR(README); + +static struct attribute *nilfs_snapshot_attrs[] = { + NILFS_SNAPSHOT_ATTR_LIST(inodes_count), + NILFS_SNAPSHOT_ATTR_LIST(blocks_count), + NILFS_SNAPSHOT_ATTR_LIST(README), + NULL, +}; + +static ssize_t nilfs_snapshot_attr_show(struct kobject *kobj, + struct attribute *attr, char *buf) +{ + struct nilfs_root *root = + container_of(kobj, struct nilfs_root, snapshot_kobj); + struct nilfs_snapshot_attr *a = + container_of(attr, struct nilfs_snapshot_attr, attr); + + return a->show ? a->show(a, root, buf) : 0; +} + +static ssize_t nilfs_snapshot_attr_store(struct kobject *kobj, + struct attribute *attr, + const char *buf, size_t len) +{ + struct nilfs_root *root = + container_of(kobj, struct nilfs_root, snapshot_kobj); + struct nilfs_snapshot_attr *a = + container_of(attr, struct nilfs_snapshot_attr, attr); + + return a->store ? a->store(a, root, buf, len) : 0; +} + +static void nilfs_snapshot_attr_release(struct kobject *kobj) +{ + struct nilfs_root *root = container_of(kobj, struct nilfs_root, + snapshot_kobj); + complete(&root->snapshot_kobj_unregister); +} + +static const struct sysfs_ops nilfs_snapshot_attr_ops = { + .show = nilfs_snapshot_attr_show, + .store = nilfs_snapshot_attr_store, +}; + +static struct kobj_type nilfs_snapshot_ktype = { + .default_attrs = nilfs_snapshot_attrs, + .sysfs_ops = &nilfs_snapshot_attr_ops, + .release = nilfs_snapshot_attr_release, +}; + +int nilfs_sysfs_create_snapshot_group(struct nilfs_root *root) +{ + struct the_nilfs *nilfs; + struct kobject *parent; + int err; + + nilfs = root->nilfs; + parent = &nilfs->ns_dev_subgroups->sg_mounted_snapshots_kobj; + root->snapshot_kobj.kset = nilfs_kset; + init_completion(&root->snapshot_kobj_unregister); + + if (root->cno == NILFS_CPTREE_CURRENT_CNO) { + err = kobject_init_and_add(&root->snapshot_kobj, + &nilfs_snapshot_ktype, + &nilfs->ns_dev_kobj, + "current_checkpoint"); + } else { + err = kobject_init_and_add(&root->snapshot_kobj, + &nilfs_snapshot_ktype, + parent, + "%llu", root->cno); + } + + if (err) + return err; + + return 0; +} + +void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *root) +{ + kobject_del(&root->snapshot_kobj); +} + +/************************************************************************ * NILFS mounted snapshots attrs * ************************************************************************/ diff --git a/fs/nilfs2/sysfs.h b/fs/nilfs2/sysfs.h index 4e84e230e9dd..677e3a1a8370 100644 --- a/fs/nilfs2/sysfs.h +++ b/fs/nilfs2/sysfs.h @@ -86,6 +86,17 @@ NILFS_DEV_ATTR_STRUCT(checkpoints); NILFS_DEV_ATTR_STRUCT(superblock); NILFS_DEV_ATTR_STRUCT(segctor); +#define NILFS_CP_ATTR_STRUCT(name) \ +struct nilfs_##name##_attr { \ + struct attribute attr; \ + ssize_t (*show)(struct nilfs_##name##_attr *, struct nilfs_root *, \ + char *); \ + ssize_t (*store)(struct nilfs_##name##_attr *, struct nilfs_root *, \ + const char *, size_t); \ +}; + +NILFS_CP_ATTR_STRUCT(snapshot); + #define NILFS_ATTR(type, name, mode, show, store) \ static struct nilfs_##type##_attr nilfs_##type##_attr_##name = \ __ATTR(name, mode, show, store) @@ -126,6 +137,13 @@ NILFS_DEV_ATTR_STRUCT(segctor); #define NILFS_CHECKPOINTS_RW_ATTR(name) \ NILFS_RW_ATTR(checkpoints, name) +#define NILFS_SNAPSHOT_INFO_ATTR(name) \ + NILFS_INFO_ATTR(snapshot, name) +#define NILFS_SNAPSHOT_RO_ATTR(name) \ + NILFS_RO_ATTR(snapshot, name) +#define NILFS_SNAPSHOT_RW_ATTR(name) \ + NILFS_RW_ATTR(snapshot, name) + #define NILFS_SUPERBLOCK_RO_ATTR(name) \ NILFS_RO_ATTR(superblock, name) #define NILFS_SUPERBLOCK_RW_ATTR(name) \ @@ -148,6 +166,8 @@ NILFS_DEV_ATTR_STRUCT(segctor); (&nilfs_mounted_snapshots_attr_##name.attr) #define NILFS_CHECKPOINTS_ATTR_LIST(name) \ (&nilfs_checkpoints_attr_##name.attr) +#define NILFS_SNAPSHOT_ATTR_LIST(name) \ + (&nilfs_snapshot_attr_##name.attr) #define NILFS_SUPERBLOCK_ATTR_LIST(name) \ (&nilfs_superblock_attr_##name.attr) #define NILFS_SEGCTOR_ATTR_LIST(name) \ diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h index 7fe822307f98..d01ead1bea9a 100644 --- a/fs/nilfs2/the_nilfs.h +++ b/fs/nilfs2/the_nilfs.h @@ -243,6 +243,8 @@ THE_NILFS_FNS(SB_DIRTY, sb_dirty) * @ifile: inode file * @inodes_count: number of inodes * @blocks_count: number of blocks + * @snapshot_kobj: /sys/fs/<nilfs>/<device>/mounted_snapshots/<snapshot> + * @snapshot_kobj_unregister: completion state for kernel object */ struct nilfs_root { __u64 cno; @@ -254,6 +256,10 @@ struct nilfs_root { atomic64_t inodes_count; atomic64_t blocks_count; + + /* /sys/fs/<nilfs>/<device>/mounted_snapshots/<snapshot> */ + struct kobject snapshot_kobj; + struct completion snapshot_kobj_unregister; }; /* Special checkpoint number */ |