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@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>
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 @@
}
/************************************************************************
+ * 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 @@
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 @@
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);
}