nilfs2: add /sys/fs/nilfs2/<device>/segments group
This patch adds creation of /sys/fs/nilfs2/<device>/segments
group.
The segments group contains attributes that describe
details about volume's segments:
(1) segments_number - show number of segments on volume.
(2) blocks_per_segment - show number of blocks in segment.
(3) clean_segments - show count of clean segments.
(4) dirty_segments - show count of dirty segments.
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 61454a8..fe8e141 100644
--- a/fs/nilfs2/sysfs.c
+++ b/fs/nilfs2/sysfs.c
@@ -112,6 +112,95 @@
}
/************************************************************************
+ * NILFS segments attrs *
+ ************************************************************************/
+
+static ssize_t
+nilfs_segments_segments_number_show(struct nilfs_segments_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_nsegments);
+}
+
+static ssize_t
+nilfs_segments_blocks_per_segment_show(struct nilfs_segments_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_blocks_per_segment);
+}
+
+static ssize_t
+nilfs_segments_clean_segments_show(struct nilfs_segments_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ unsigned long ncleansegs;
+
+ down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
+ ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile);
+ up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
+
+ return snprintf(buf, PAGE_SIZE, "%lu\n", ncleansegs);
+}
+
+static ssize_t
+nilfs_segments_dirty_segments_show(struct nilfs_segments_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ struct nilfs_sustat sustat;
+ int err;
+
+ down_read(&nilfs->ns_segctor_sem);
+ err = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
+ up_read(&nilfs->ns_segctor_sem);
+ if (err < 0) {
+ printk(KERN_ERR "NILFS: unable to get segment stat: err=%d\n",
+ err);
+ return err;
+ }
+
+ return snprintf(buf, PAGE_SIZE, "%llu\n", sustat.ss_ndirtysegs);
+}
+
+static const char segments_readme_str[] =
+ "The segments group contains attributes that describe\n"
+ "details about volume's segments.\n\n"
+ "(1) segments_number\n\tshow number of segments on volume.\n\n"
+ "(2) blocks_per_segment\n\tshow number of blocks in segment.\n\n"
+ "(3) clean_segments\n\tshow count of clean segments.\n\n"
+ "(4) dirty_segments\n\tshow count of dirty segments.\n\n";
+
+static ssize_t
+nilfs_segments_README_show(struct nilfs_segments_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, segments_readme_str);
+}
+
+NILFS_SEGMENTS_RO_ATTR(segments_number);
+NILFS_SEGMENTS_RO_ATTR(blocks_per_segment);
+NILFS_SEGMENTS_RO_ATTR(clean_segments);
+NILFS_SEGMENTS_RO_ATTR(dirty_segments);
+NILFS_SEGMENTS_RO_ATTR(README);
+
+static struct attribute *nilfs_segments_attrs[] = {
+ NILFS_SEGMENTS_ATTR_LIST(segments_number),
+ NILFS_SEGMENTS_ATTR_LIST(blocks_per_segment),
+ NILFS_SEGMENTS_ATTR_LIST(clean_segments),
+ NILFS_SEGMENTS_ATTR_LIST(dirty_segments),
+ NILFS_SEGMENTS_ATTR_LIST(README),
+ NULL,
+};
+
+NILFS_DEV_INT_GROUP_OPS(segments, dev);
+NILFS_DEV_INT_GROUP_TYPE(segments, dev);
+NILFS_DEV_INT_GROUP_FNS(segments, dev);
+
+/************************************************************************
* NILFS segctor attrs *
************************************************************************/
@@ -664,10 +753,14 @@
if (err)
goto free_dev_subgroups;
- err = nilfs_sysfs_create_superblock_group(nilfs);
+ err = nilfs_sysfs_create_segments_group(nilfs);
if (err)
goto cleanup_dev_kobject;
+ err = nilfs_sysfs_create_superblock_group(nilfs);
+ if (err)
+ goto delete_segments_group;
+
err = nilfs_sysfs_create_segctor_group(nilfs);
if (err)
goto delete_superblock_group;
@@ -677,6 +770,9 @@
delete_superblock_group:
nilfs_sysfs_delete_superblock_group(nilfs);
+delete_segments_group:
+ nilfs_sysfs_delete_segments_group(nilfs);
+
cleanup_dev_kobject:
kobject_del(&nilfs->ns_dev_kobj);
@@ -689,6 +785,7 @@
void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
{
+ nilfs_sysfs_delete_segments_group(nilfs);
nilfs_sysfs_delete_superblock_group(nilfs);
nilfs_sysfs_delete_segctor_group(nilfs);
kobject_del(&nilfs->ns_dev_kobj);