[PATCH v4 4/9] nilfs2: add /sys/fs/nilfs2/<device>/segctor group

[Vyacheslav Dubeyko]

From: Vyacheslav Dubeyko <Vyacheslav.Dubeyko-***@public.gmane.org>
Subject: [PATCH v4 4/9] nilfs2: add /sys/fs/nilfs2/<device>/segctor group

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

The segctor group contains attributes that describe
segctor thread activity details:
(1) last_pseg_block - show start block number of the latest segment.
(2) last_seg_sequence - show sequence value of the latest segment.
(3) last_seg_checkpoint - show checkpoint number of the latest segment.
(4) current_seg_sequence - show segment sequence counter.
(5) current_last_full_seg - show index number of the latest full segment.
(6) next_full_seg - show index number of the full segment index
to be used next.
(7) next_pseg_offset - show offset of next partial segment in
the current full segment.
(8) next_checkpoint - show next checkpoint number.
(9) last_seg_write_time - show write time of the last segment
in human-readable format.
(10) last_seg_write_time_secs - show write time of the last segment
in seconds.
(11) last_nongc_write_time - show write time of the last segment
not for cleaner operation in human-readable format.
(12) last_nongc_write_time_secs - show write time of the last segment
not for cleaner operation in seconds.
(13) dirty_data_blocks_count - show number of dirty data blocks.

Signed-off-by: Vyacheslav Dubeyko <Vyacheslav.Dubeyko-***@public.gmane.org>
CC: Vyacheslav Dubeyko <slava-***@public.gmane.org>
CC: Ryusuke Konishi <konishi.ryusuke-***@public.gmane.org>
CC: Michael L. Semon <mlsemon35-***@public.gmane.org>
---
Documentation/ABI/testing/sysfs-fs-nilfs2 | 90 ++++++++++
fs/nilfs2/sysfs.c | 270 +++++++++++++++++++++++++++++
fs/nilfs2/sysfs.h | 16 ++
3 files changed, 376 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-fs-nilfs2 b/Documentation/ABI/testing/sysfs-fs-nilfs2
index e9b4c61..c9952f4 100644
--- a/Documentation/ABI/testing/sysfs-fs-nilfs2
+++ b/Documentation/ABI/testing/sysfs-fs-nilfs2
@@ -89,3 +89,93 @@ Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
Description:
Describe attributes of /sys/fs/nilfs2/<device>/superblock
group.
+
+What: /sys/fs/nilfs2/<device>/segctor/last_pseg_block
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show start block number of the latest segment.
+
+What: /sys/fs/nilfs2/<device>/segctor/last_seg_sequence
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show sequence value of the latest segment.
+
+What: /sys/fs/nilfs2/<device>/segctor/last_seg_checkpoint
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show checkpoint number of the latest segment.
+
+What: /sys/fs/nilfs2/<device>/segctor/current_seg_sequence
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show segment sequence counter.
+
+What: /sys/fs/nilfs2/<device>/segctor/current_last_full_seg
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show index number of the latest full segment.
+
+What: /sys/fs/nilfs2/<device>/segctor/next_full_seg
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show index number of the full segment index
+ to be used next.
+
+What: /sys/fs/nilfs2/<device>/segctor/next_pseg_offset
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show offset of next partial segment in the current
+ full segment.
+
+What: /sys/fs/nilfs2/<device>/segctor/next_checkpoint
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show next checkpoint number.
+
+What: /sys/fs/nilfs2/<device>/segctor/last_seg_write_time
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show write time of the last segment in
+ human-readable format.
+
+What: /sys/fs/nilfs2/<device>/segctor/last_seg_write_time_secs
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show write time of the last segment in seconds.
+
+What: /sys/fs/nilfs2/<device>/segctor/last_nongc_write_time
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show write time of the last segment not for cleaner
+ operation in human-readable format.
+
+What: /sys/fs/nilfs2/<device>/segctor/last_nongc_write_time_secs
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show write time of the last segment not for cleaner
+ operation in seconds.
+
+What: /sys/fs/nilfs2/<device>/segctor/dirty_data_blocks_count
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Show number of dirty data blocks.
+
+What: /sys/fs/nilfs2/<device>/segctor/README
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava-***@public.gmane.org>
+Description:
+ Describe attributes of /sys/fs/nilfs2/<device>/segctor
+ group.
diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c
index 239f239..61454a8 100644
--- a/fs/nilfs2/sysfs.c
+++ b/fs/nilfs2/sysfs.c
@@ -112,6 +112,268 @@ void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \
}

/************************************************************************
+ * NILFS segctor attrs *
+ ************************************************************************/
+
+static ssize_t
+nilfs_segctor_last_pseg_block_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ sector_t last_pseg;
+
+ spin_lock(&nilfs->ns_last_segment_lock);
+ last_pseg = nilfs->ns_last_pseg;
+ spin_unlock(&nilfs->ns_last_segment_lock);
+
+ return snprintf(buf, PAGE_SIZE, "%llu\n",
+ (unsigned long long)last_pseg);
+}
+
+static ssize_t
+nilfs_segctor_last_seg_sequence_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ u64 last_seq;
+
+ spin_lock(&nilfs->ns_last_segment_lock);
+ last_seq = nilfs->ns_last_seq;
+ spin_unlock(&nilfs->ns_last_segment_lock);
+
+ return snprintf(buf, PAGE_SIZE, "%llu\n", last_seq);
+}
+
+static ssize_t
+nilfs_segctor_last_seg_checkpoint_show(struct nilfs_segctor_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_segctor_current_seg_sequence_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ u64 seg_seq;
+
+ down_read(&nilfs->ns_sem);
+ seg_seq = nilfs->ns_seg_seq;
+ up_read(&nilfs->ns_sem);
+
+ return snprintf(buf, PAGE_SIZE, "%llu\n", seg_seq);
+}
+
+static ssize_t
+nilfs_segctor_current_last_full_seg_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ __u64 segnum;
+
+ down_read(&nilfs->ns_sem);
+ segnum = nilfs->ns_segnum;
+ up_read(&nilfs->ns_sem);
+
+ return snprintf(buf, PAGE_SIZE, "%llu\n", segnum);
+}
+
+static ssize_t
+nilfs_segctor_next_full_seg_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ __u64 nextnum;
+
+ down_read(&nilfs->ns_sem);
+ nextnum = nilfs->ns_nextnum;
+ up_read(&nilfs->ns_sem);
+
+ return snprintf(buf, PAGE_SIZE, "%llu\n", nextnum);
+}
+
+static ssize_t
+nilfs_segctor_next_pseg_offset_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ unsigned long pseg_offset;
+
+ down_read(&nilfs->ns_sem);
+ pseg_offset = nilfs->ns_pseg_offset;
+ up_read(&nilfs->ns_sem);
+
+ return snprintf(buf, PAGE_SIZE, "%lu\n", pseg_offset);
+}
+
+static ssize_t
+nilfs_segctor_next_checkpoint_show(struct nilfs_segctor_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 ssize_t
+nilfs_segctor_last_seg_write_time_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ time_t ctime;
+
+ down_read(&nilfs->ns_sem);
+ ctime = nilfs->ns_ctime;
+ up_read(&nilfs->ns_sem);
+
+ return NILFS_SHOW_TIME(ctime, buf);
+}
+
+static ssize_t
+nilfs_segctor_last_seg_write_time_secs_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ time_t ctime;
+
+ down_read(&nilfs->ns_sem);
+ ctime = nilfs->ns_ctime;
+ up_read(&nilfs->ns_sem);
+
+ return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)ctime);
+}
+
+static ssize_t
+nilfs_segctor_last_nongc_write_time_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ time_t nongc_ctime;
+
+ down_read(&nilfs->ns_sem);
+ nongc_ctime = nilfs->ns_nongc_ctime;
+ up_read(&nilfs->ns_sem);
+
+ return NILFS_SHOW_TIME(nongc_ctime, buf);
+}
+
+static ssize_t
+nilfs_segctor_last_nongc_write_time_secs_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ time_t nongc_ctime;
+
+ down_read(&nilfs->ns_sem);
+ nongc_ctime = nilfs->ns_nongc_ctime;
+ up_read(&nilfs->ns_sem);
+
+ return snprintf(buf, PAGE_SIZE, "%llu\n",
+ (unsigned long long)nongc_ctime);
+}
+
+static ssize_t
+nilfs_segctor_dirty_data_blocks_count_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ u32 ndirtyblks;
+
+ down_read(&nilfs->ns_sem);
+ ndirtyblks = atomic_read(&nilfs->ns_ndirtyblks);
+ up_read(&nilfs->ns_sem);
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", ndirtyblks);
+}
+
+static const char segctor_readme_str[] =
+ "The segctor group contains attributes that describe\n"
+ "segctor thread activity details.\n\n"
+ "(1) last_pseg_block\n"
+ "\tshow start block number of the latest segment.\n\n"
+ "(2) last_seg_sequence\n"
+ "\tshow sequence value of the latest segment.\n\n"
+ "(3) last_seg_checkpoint\n"
+ "\tshow checkpoint number of the latest segment.\n\n"
+ "(4) current_seg_sequence\n\tshow segment sequence counter.\n\n"
+ "(5) current_last_full_seg\n"
+ "\tshow index number of the latest full segment.\n\n"
+ "(6) next_full_seg\n"
+ "\tshow index number of the full segment index to be used next.\n\n"
+ "(7) next_pseg_offset\n"
+ "\tshow offset of next partial segment in the current full segment.\n\n"
+ "(8) next_checkpoint\n\tshow next checkpoint number.\n\n"
+ "(9) last_seg_write_time\n"
+ "\tshow write time of the last segment in human-readable format.\n\n"
+ "(10) last_seg_write_time_secs\n"
+ "\tshow write time of the last segment in seconds.\n\n"
+ "(11) last_nongc_write_time\n"
+ "\tshow write time of the last segment not for cleaner operation "
+ "in human-readable format.\n\n"
+ "(12) last_nongc_write_time_secs\n"
+ "\tshow write time of the last segment not for cleaner operation "
+ "in seconds.\n\n"
+ "(13) dirty_data_blocks_count\n"
+ "\tshow number of dirty data blocks.\n\n";
+
+static ssize_t
+nilfs_segctor_README_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, segctor_readme_str);
+}
+
+NILFS_SEGCTOR_RO_ATTR(last_pseg_block);
+NILFS_SEGCTOR_RO_ATTR(last_seg_sequence);
+NILFS_SEGCTOR_RO_ATTR(last_seg_checkpoint);
+NILFS_SEGCTOR_RO_ATTR(current_seg_sequence);
+NILFS_SEGCTOR_RO_ATTR(current_last_full_seg);
+NILFS_SEGCTOR_RO_ATTR(next_full_seg);
+NILFS_SEGCTOR_RO_ATTR(next_pseg_offset);
+NILFS_SEGCTOR_RO_ATTR(next_checkpoint);
+NILFS_SEGCTOR_RO_ATTR(last_seg_write_time);
+NILFS_SEGCTOR_RO_ATTR(last_seg_write_time_secs);
+NILFS_SEGCTOR_RO_ATTR(last_nongc_write_time);
+NILFS_SEGCTOR_RO_ATTR(last_nongc_write_time_secs);
+NILFS_SEGCTOR_RO_ATTR(dirty_data_blocks_count);
+NILFS_SEGCTOR_RO_ATTR(README);
+
+static struct attribute *nilfs_segctor_attrs[] = {
+ NILFS_SEGCTOR_ATTR_LIST(last_pseg_block),
+ NILFS_SEGCTOR_ATTR_LIST(last_seg_sequence),
+ NILFS_SEGCTOR_ATTR_LIST(last_seg_checkpoint),
+ NILFS_SEGCTOR_ATTR_LIST(current_seg_sequence),
+ NILFS_SEGCTOR_ATTR_LIST(current_last_full_seg),
+ NILFS_SEGCTOR_ATTR_LIST(next_full_seg),
+ NILFS_SEGCTOR_ATTR_LIST(next_pseg_offset),
+ NILFS_SEGCTOR_ATTR_LIST(next_checkpoint),
+ NILFS_SEGCTOR_ATTR_LIST(last_seg_write_time),
+ NILFS_SEGCTOR_ATTR_LIST(last_seg_write_time_secs),
+ NILFS_SEGCTOR_ATTR_LIST(last_nongc_write_time),
+ NILFS_SEGCTOR_ATTR_LIST(last_nongc_write_time_secs),
+ NILFS_SEGCTOR_ATTR_LIST(dirty_data_blocks_count),
+ NILFS_SEGCTOR_ATTR_LIST(README),
+ NULL,
+};
+
+NILFS_DEV_INT_GROUP_OPS(segctor, dev);
+NILFS_DEV_INT_GROUP_TYPE(segctor, dev);
+NILFS_DEV_INT_GROUP_FNS(segctor, dev);
+
+/************************************************************************
* NILFS superblock attrs *
************************************************************************/

@@ -406,8 +668,15 @@ int nilfs_sysfs_create_device_group(struct super_block *sb)
if (err)
goto cleanup_dev_kobject;

+ err = nilfs_sysfs_create_segctor_group(nilfs);
+ if (err)
+ goto delete_superblock_group;
+
return 0;

+delete_superblock_group:
+ nilfs_sysfs_delete_superblock_group(nilfs);
+
cleanup_dev_kobject:
kobject_del(&nilfs->ns_dev_kobj);

@@ -421,6 +690,7 @@ failed_create_device_group:
void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
{
nilfs_sysfs_delete_superblock_group(nilfs);
+ nilfs_sysfs_delete_segctor_group(nilfs);
kobject_del(&nilfs->ns_dev_kobj);
kfree(nilfs->ns_dev_subgroups);
}
diff --git a/fs/nilfs2/sysfs.h b/fs/nilfs2/sysfs.h
index 1d76af5..ad4d5bc 100644
--- a/fs/nilfs2/sysfs.h
+++ b/fs/nilfs2/sysfs.h
@@ -28,11 +28,17 @@
* struct nilfs_sysfs_dev_subgroups - device subgroup kernel objects
* @sg_superblock_kobj: /sys/fs/<nilfs>/<device>/superblock
* @sg_superblock_kobj_unregister: completion state
+ * @sg_segctor_kobj: /sys/fs/<nilfs>/<device>/segctor
+ * @sg_segctor_kobj_unregister: completion state
*/
struct nilfs_sysfs_dev_subgroups {
/* /sys/fs/<nilfs>/<device>/superblock */
struct kobject sg_superblock_kobj;
struct completion sg_superblock_kobj_unregister;
+
+ /* /sys/fs/<nilfs>/<device>/segctor */
+ struct kobject sg_segctor_kobj;
+ struct completion sg_segctor_kobj_unregister;
};

#define NILFS_COMMON_ATTR_STRUCT(name) \
@@ -57,6 +63,7 @@ struct nilfs_##name##_attr { \

NILFS_DEV_ATTR_STRUCT(dev);
NILFS_DEV_ATTR_STRUCT(superblock);
+NILFS_DEV_ATTR_STRUCT(segctor);

#define NILFS_ATTR(type, name, mode, show, store) \
static struct nilfs_##type##_attr nilfs_##type##_attr_##name = \
@@ -90,11 +97,20 @@ NILFS_DEV_ATTR_STRUCT(superblock);
#define NILFS_SUPERBLOCK_RW_ATTR(name) \
NILFS_RW_ATTR(superblock, name)

+#define NILFS_SEGCTOR_INFO_ATTR(name) \
+ NILFS_INFO_ATTR(segctor, name)
+#define NILFS_SEGCTOR_RO_ATTR(name) \
+ NILFS_RO_ATTR(segctor, name)
+#define NILFS_SEGCTOR_RW_ATTR(name) \
+ NILFS_RW_ATTR(segctor, name)
+
#define NILFS_FEATURE_ATTR_LIST(name) \
(&nilfs_feature_attr_##name.attr)
#define NILFS_DEV_ATTR_LIST(name) \
(&nilfs_dev_attr_##name.attr)
#define NILFS_SUPERBLOCK_ATTR_LIST(name) \
(&nilfs_superblock_attr_##name.attr)
+#define NILFS_SEGCTOR_ATTR_LIST(name) \
+ (&nilfs_segctor_attr_##name.attr)

#endif /* _NILFS_SYSFS_H */