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

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

The checkpoints group contains attributes that describe
details about volume's checkpoints:
(1) checkpoints_number - show number of checkpoints on volume.
(2) snapshots_number - show number of snapshots on volume.
(3) last_seg_checkpoint - show checkpoint number of the latest segment.
(4) next_checkpoint - show next checkpoint number.

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 14:20:48 -07:00 committed by Linus Torvalds
parent ef43d5cd84
commit 02a0ba1c60
3 changed files with 167 additions and 1 deletions
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31
Documentation/ABI/testing/sysfs-fs-nilfs2
View File

@ -210,3 +210,34 @@ Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Describe attributes of /sys/fs/nilfs2/<device>/segments
group.
What: /sys/fs/nilfs2/<device>/checkpoints/checkpoints_number
Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Show number of checkpoints on volume.
What: /sys/fs/nilfs2/<device>/checkpoints/snapshots_number
Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Show number of snapshots on volume.
What: /sys/fs/nilfs2/<device>/checkpoints/last_seg_checkpoint
Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Show checkpoint number of the latest segment.
What: /sys/fs/nilfs2/<device>/checkpoints/next_checkpoint
Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Show next checkpoint number.
What: /sys/fs/nilfs2/<device>/checkpoints/README
Date: April 2014
Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Describe attributes of /sys/fs/nilfs2/<device>/checkpoints
group.

123
fs/nilfs2/sysfs.c
View File

@ -111,6 +111,119 @@ void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \
kobject_del(&nilfs->ns_##parent_name##_subgroups->sg_##name##_kobj); \
}
/************************************************************************
* NILFS checkpoints attrs *
************************************************************************/
static ssize_t
nilfs_checkpoints_checkpoints_number_show(struct nilfs_checkpoints_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
__u64 ncheckpoints;
struct nilfs_cpstat cpstat;
int err;
down_read(&nilfs->ns_segctor_sem);
err = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
up_read(&nilfs->ns_segctor_sem);
if (err < 0) {
printk(KERN_ERR "NILFS: unable to get checkpoint stat: err=%d\n",
err);
return err;
}
ncheckpoints = cpstat.cs_ncps;
return snprintf(buf, PAGE_SIZE, "%llu\n", ncheckpoints);
}
static ssize_t
nilfs_checkpoints_snapshots_number_show(struct nilfs_checkpoints_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
__u64 nsnapshots;
struct nilfs_cpstat cpstat;
int err;
down_read(&nilfs->ns_segctor_sem);
err = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
up_read(&nilfs->ns_segctor_sem);
if (err < 0) {
printk(KERN_ERR "NILFS: unable to get checkpoint stat: err=%d\n",
err);
return err;
}
nsnapshots = cpstat.cs_nsss;
return snprintf(buf, PAGE_SIZE, "%llu\n", nsnapshots);
}
static ssize_t
nilfs_checkpoints_last_seg_checkpoint_show(struct nilfs_checkpoints_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
__u64 last_cno;
spin_lock(&nilfs->ns_last_segment_lock);
last_cno = nilfs->ns_last_cno;
spin_unlock(&nilfs->ns_last_segment_lock);
return snprintf(buf, PAGE_SIZE, "%llu\n", last_cno);
}
static ssize_t
nilfs_checkpoints_next_checkpoint_show(struct nilfs_checkpoints_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
__u64 cno;
down_read(&nilfs->ns_sem);
cno = nilfs->ns_cno;
up_read(&nilfs->ns_sem);
return snprintf(buf, PAGE_SIZE, "%llu\n", cno);
}
static const char checkpoints_readme_str[] =
"The checkpoints group contains attributes that describe\n"
"details about volume's checkpoints.\n\n"
"(1) checkpoints_number\n\tshow number of checkpoints on volume.\n\n"
"(2) snapshots_number\n\tshow number of snapshots on volume.\n\n"
"(3) last_seg_checkpoint\n"
"\tshow checkpoint number of the latest segment.\n\n"
"(4) next_checkpoint\n\tshow next checkpoint number.\n\n";
static ssize_t
nilfs_checkpoints_README_show(struct nilfs_checkpoints_attr *attr,
struct the_nilfs *nilfs, char *buf)
{
return snprintf(buf, PAGE_SIZE, checkpoints_readme_str);
}
NILFS_CHECKPOINTS_RO_ATTR(checkpoints_number);
NILFS_CHECKPOINTS_RO_ATTR(snapshots_number);
NILFS_CHECKPOINTS_RO_ATTR(last_seg_checkpoint);
NILFS_CHECKPOINTS_RO_ATTR(next_checkpoint);
NILFS_CHECKPOINTS_RO_ATTR(README);
static struct attribute *nilfs_checkpoints_attrs[] = {
NILFS_CHECKPOINTS_ATTR_LIST(checkpoints_number),
NILFS_CHECKPOINTS_ATTR_LIST(snapshots_number),
NILFS_CHECKPOINTS_ATTR_LIST(last_seg_checkpoint),
NILFS_CHECKPOINTS_ATTR_LIST(next_checkpoint),
NILFS_CHECKPOINTS_ATTR_LIST(README),
NULL,
};
NILFS_DEV_INT_GROUP_OPS(checkpoints, dev);
NILFS_DEV_INT_GROUP_TYPE(checkpoints, dev);
NILFS_DEV_INT_GROUP_FNS(checkpoints, dev);
/************************************************************************
* NILFS segments attrs *
************************************************************************/
@ -753,10 +866,14 @@ int nilfs_sysfs_create_device_group(struct super_block *sb)
if (err)
goto free_dev_subgroups;
err = nilfs_sysfs_create_segments_group(nilfs);
err = nilfs_sysfs_create_checkpoints_group(nilfs);
if (err)
goto cleanup_dev_kobject;
err = nilfs_sysfs_create_segments_group(nilfs);
if (err)
goto delete_checkpoints_group;
err = nilfs_sysfs_create_superblock_group(nilfs);
if (err)
goto delete_segments_group;
@ -773,6 +890,9 @@ int nilfs_sysfs_create_device_group(struct super_block *sb)
delete_segments_group:
nilfs_sysfs_delete_segments_group(nilfs);
delete_checkpoints_group:
nilfs_sysfs_delete_checkpoints_group(nilfs);
cleanup_dev_kobject:
kobject_del(&nilfs->ns_dev_kobj);
@ -785,6 +905,7 @@ int nilfs_sysfs_create_device_group(struct super_block *sb)
void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
{
nilfs_sysfs_delete_checkpoints_group(nilfs);
nilfs_sysfs_delete_segments_group(nilfs);
nilfs_sysfs_delete_superblock_group(nilfs);
nilfs_sysfs_delete_segctor_group(nilfs);

14
fs/nilfs2/sysfs.h
View File

@ -30,6 +30,8 @@
* @sg_superblock_kobj_unregister: completion state
* @sg_segctor_kobj: /sys/fs/<nilfs>/<device>/segctor
* @sg_segctor_kobj_unregister: completion state
* @sg_checkpoints_kobj: /sys/fs/<nilfs>/<device>/checkpoints
* @sg_checkpoints_kobj_unregister: completion state
* @sg_segments_kobj: /sys/fs/<nilfs>/<device>/segments
* @sg_segments_kobj_unregister: completion state
*/
@ -42,6 +44,10 @@ struct nilfs_sysfs_dev_subgroups {
struct kobject sg_segctor_kobj;
struct completion sg_segctor_kobj_unregister;
/* /sys/fs/<nilfs>/<device>/checkpoints */
struct kobject sg_checkpoints_kobj;
struct completion sg_checkpoints_kobj_unregister;
/* /sys/fs/<nilfs>/<device>/segments */
struct kobject sg_segments_kobj;
struct completion sg_segments_kobj_unregister;
@ -69,6 +75,7 @@ struct nilfs_##name##_attr { \
NILFS_DEV_ATTR_STRUCT(dev);
NILFS_DEV_ATTR_STRUCT(segments);
NILFS_DEV_ATTR_STRUCT(checkpoints);
NILFS_DEV_ATTR_STRUCT(superblock);
NILFS_DEV_ATTR_STRUCT(segctor);
@ -104,6 +111,11 @@ NILFS_DEV_ATTR_STRUCT(segctor);
#define NILFS_SEGMENTS_RW_ATTR(name) \
NILFS_RW_ATTR(segs_info, name)
#define NILFS_CHECKPOINTS_RO_ATTR(name) \
NILFS_RO_ATTR(checkpoints, name)
#define NILFS_CHECKPOINTS_RW_ATTR(name) \
NILFS_RW_ATTR(checkpoints, name)
#define NILFS_SUPERBLOCK_RO_ATTR(name) \
NILFS_RO_ATTR(superblock, name)
#define NILFS_SUPERBLOCK_RW_ATTR(name) \
@ -122,6 +134,8 @@ NILFS_DEV_ATTR_STRUCT(segctor);
(&nilfs_dev_attr_##name.attr)
#define NILFS_SEGMENTS_ATTR_LIST(name) \
(&nilfs_segments_attr_##name.attr)
#define NILFS_CHECKPOINTS_ATTR_LIST(name) \
(&nilfs_checkpoints_attr_##name.attr)
#define NILFS_SUPERBLOCK_ATTR_LIST(name) \
(&nilfs_superblock_attr_##name.attr)
#define NILFS_SEGCTOR_ATTR_LIST(name) \