summaryrefslogtreecommitdiffstats
path: root/fs/nilfs2/sysfs.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/nilfs2/sysfs.c')
-rw-r--r--fs/nilfs2/sysfs.c1117
1 files changed, 1117 insertions, 0 deletions
diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c
new file mode 100644
index 0000000000..379d22e28e
--- /dev/null
+++ b/fs/nilfs2/sysfs.c
@@ -0,0 +1,1117 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Sysfs support implementation.
+ *
+ * Copyright (C) 2005-2014 Nippon Telegraph and Telephone Corporation.
+ * Copyright (C) 2014 HGST, Inc., a Western Digital Company.
+ *
+ * Written by Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com>
+ */
+
+#include <linux/kobject.h>
+
+#include "nilfs.h"
+#include "mdt.h"
+#include "sufile.h"
+#include "cpfile.h"
+#include "sysfs.h"
+
+/* /sys/fs/<nilfs>/ */
+static struct kset *nilfs_kset;
+
+#define NILFS_DEV_INT_GROUP_OPS(name, parent_name) \
+static ssize_t nilfs_##name##_attr_show(struct kobject *kobj, \
+ struct attribute *attr, char *buf) \
+{ \
+ struct the_nilfs *nilfs = container_of(kobj->parent, \
+ struct the_nilfs, \
+ ns_##parent_name##_kobj); \
+ struct nilfs_##name##_attr *a = container_of(attr, \
+ struct nilfs_##name##_attr, \
+ attr); \
+ return a->show ? a->show(a, nilfs, buf) : 0; \
+} \
+static ssize_t nilfs_##name##_attr_store(struct kobject *kobj, \
+ struct attribute *attr, \
+ const char *buf, size_t len) \
+{ \
+ struct the_nilfs *nilfs = container_of(kobj->parent, \
+ struct the_nilfs, \
+ ns_##parent_name##_kobj); \
+ struct nilfs_##name##_attr *a = container_of(attr, \
+ struct nilfs_##name##_attr, \
+ attr); \
+ return a->store ? a->store(a, nilfs, buf, len) : 0; \
+} \
+static const struct sysfs_ops nilfs_##name##_attr_ops = { \
+ .show = nilfs_##name##_attr_show, \
+ .store = nilfs_##name##_attr_store, \
+}
+
+#define NILFS_DEV_INT_GROUP_TYPE(name, parent_name) \
+static void nilfs_##name##_attr_release(struct kobject *kobj) \
+{ \
+ struct nilfs_sysfs_##parent_name##_subgroups *subgroups = container_of(kobj, \
+ struct nilfs_sysfs_##parent_name##_subgroups, \
+ sg_##name##_kobj); \
+ complete(&subgroups->sg_##name##_kobj_unregister); \
+} \
+static struct kobj_type nilfs_##name##_ktype = { \
+ .default_groups = nilfs_##name##_groups, \
+ .sysfs_ops = &nilfs_##name##_attr_ops, \
+ .release = nilfs_##name##_attr_release, \
+}
+
+#define NILFS_DEV_INT_GROUP_FNS(name, parent_name) \
+static int nilfs_sysfs_create_##name##_group(struct the_nilfs *nilfs) \
+{ \
+ struct kobject *parent; \
+ struct kobject *kobj; \
+ struct completion *kobj_unregister; \
+ struct nilfs_sysfs_##parent_name##_subgroups *subgroups; \
+ int err; \
+ subgroups = nilfs->ns_##parent_name##_subgroups; \
+ kobj = &subgroups->sg_##name##_kobj; \
+ kobj_unregister = &subgroups->sg_##name##_kobj_unregister; \
+ parent = &nilfs->ns_##parent_name##_kobj; \
+ kobj->kset = nilfs_kset; \
+ init_completion(kobj_unregister); \
+ err = kobject_init_and_add(kobj, &nilfs_##name##_ktype, parent, \
+ #name); \
+ if (err) \
+ kobject_put(kobj); \
+ return err; \
+} \
+static void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \
+{ \
+ kobject_put(&nilfs->ns_##parent_name##_subgroups->sg_##name##_kobj); \
+}
+
+/************************************************************************
+ * NILFS snapshot attrs *
+ ************************************************************************/
+
+static ssize_t
+nilfs_snapshot_inodes_count_show(struct nilfs_snapshot_attr *attr,
+ struct nilfs_root *root, char *buf)
+{
+ return sysfs_emit(buf, "%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 sysfs_emit(buf, "%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 sysfs_emit(buf, 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,
+};
+ATTRIBUTE_GROUPS(nilfs_snapshot);
+
+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_groups = nilfs_snapshot_groups,
+ .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)
+ kobject_put(&root->snapshot_kobj);
+
+ return err;
+}
+
+void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *root)
+{
+ kobject_put(&root->snapshot_kobj);
+}
+
+/************************************************************************
+ * NILFS mounted snapshots attrs *
+ ************************************************************************/
+
+static const char mounted_snapshots_readme_str[] =
+ "The mounted_snapshots group contains group for\n"
+ "every mounted snapshot.\n";
+
+static ssize_t
+nilfs_mounted_snapshots_README_show(struct nilfs_mounted_snapshots_attr *attr,
+ struct the_nilfs *nilfs, char *buf)
+{
+ return sysfs_emit(buf, mounted_snapshots_readme_str);
+}
+
+NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(README);
+
+static struct attribute *nilfs_mounted_snapshots_attrs[] = {
+ NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(README),
+ NULL,
+};
+ATTRIBUTE_GROUPS(nilfs_mounted_snapshots);
+
+NILFS_DEV_INT_GROUP_OPS(mounted_snapshots, dev);
+NILFS_DEV_INT_GROUP_TYPE(mounted_snapshots, dev);
+NILFS_DEV_INT_GROUP_FNS(mounted_snapshots, dev);
+
+/************************************************************************
+ * 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) {
+ nilfs_err(nilfs->ns_sb, "unable to get checkpoint stat: err=%d",
+ err);
+ return err;
+ }
+
+ ncheckpoints = cpstat.cs_ncps;
+
+ return sysfs_emit(buf, "%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) {
+ nilfs_err(nilfs->ns_sb, "unable to get checkpoint stat: err=%d",
+ err);
+ return err;
+ }
+
+ nsnapshots = cpstat.cs_nsss;
+
+ return sysfs_emit(buf, "%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 sysfs_emit(buf, "%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_segctor_sem);
+ cno = nilfs->ns_cno;
+ up_read(&nilfs->ns_segctor_sem);
+
+ return sysfs_emit(buf, "%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 sysfs_emit(buf, 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,
+};
+ATTRIBUTE_GROUPS(nilfs_checkpoints);
+
+NILFS_DEV_INT_GROUP_OPS(checkpoints, dev);
+NILFS_DEV_INT_GROUP_TYPE(checkpoints, dev);
+NILFS_DEV_INT_GROUP_FNS(checkpoints, dev);
+
+/************************************************************************
+ * NILFS segments attrs *
+ ************************************************************************/
+
+static ssize_t
+nilfs_segments_segments_number_show(struct nilfs_segments_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ return sysfs_emit(buf, "%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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%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) {
+ nilfs_err(nilfs->ns_sb, "unable to get segment stat: err=%d",
+ err);
+ return err;
+ }
+
+ return sysfs_emit(buf, "%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 sysfs_emit(buf, 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,
+};
+ATTRIBUTE_GROUPS(nilfs_segments);
+
+NILFS_DEV_INT_GROUP_OPS(segments, dev);
+NILFS_DEV_INT_GROUP_TYPE(segments, dev);
+NILFS_DEV_INT_GROUP_FNS(segments, dev);
+
+/************************************************************************
+ * 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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%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_segctor_sem);
+ seg_seq = nilfs->ns_seg_seq;
+ up_read(&nilfs->ns_segctor_sem);
+
+ return sysfs_emit(buf, "%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_segctor_sem);
+ segnum = nilfs->ns_segnum;
+ up_read(&nilfs->ns_segctor_sem);
+
+ return sysfs_emit(buf, "%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_segctor_sem);
+ nextnum = nilfs->ns_nextnum;
+ up_read(&nilfs->ns_segctor_sem);
+
+ return sysfs_emit(buf, "%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_segctor_sem);
+ pseg_offset = nilfs->ns_pseg_offset;
+ up_read(&nilfs->ns_segctor_sem);
+
+ return sysfs_emit(buf, "%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_segctor_sem);
+ cno = nilfs->ns_cno;
+ up_read(&nilfs->ns_segctor_sem);
+
+ return sysfs_emit(buf, "%llu\n", cno);
+}
+
+static ssize_t
+nilfs_segctor_last_seg_write_time_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ time64_t ctime;
+
+ down_read(&nilfs->ns_segctor_sem);
+ ctime = nilfs->ns_ctime;
+ up_read(&nilfs->ns_segctor_sem);
+
+ return sysfs_emit(buf, "%ptTs\n", &ctime);
+}
+
+static ssize_t
+nilfs_segctor_last_seg_write_time_secs_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ time64_t ctime;
+
+ down_read(&nilfs->ns_segctor_sem);
+ ctime = nilfs->ns_ctime;
+ up_read(&nilfs->ns_segctor_sem);
+
+ return sysfs_emit(buf, "%llu\n", ctime);
+}
+
+static ssize_t
+nilfs_segctor_last_nongc_write_time_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ time64_t nongc_ctime;
+
+ down_read(&nilfs->ns_segctor_sem);
+ nongc_ctime = nilfs->ns_nongc_ctime;
+ up_read(&nilfs->ns_segctor_sem);
+
+ return sysfs_emit(buf, "%ptTs\n", &nongc_ctime);
+}
+
+static ssize_t
+nilfs_segctor_last_nongc_write_time_secs_show(struct nilfs_segctor_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ time64_t nongc_ctime;
+
+ down_read(&nilfs->ns_segctor_sem);
+ nongc_ctime = nilfs->ns_nongc_ctime;
+ up_read(&nilfs->ns_segctor_sem);
+
+ return sysfs_emit(buf, "%llu\n", 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_segctor_sem);
+ ndirtyblks = atomic_read(&nilfs->ns_ndirtyblks);
+ up_read(&nilfs->ns_segctor_sem);
+
+ return sysfs_emit(buf, "%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 sysfs_emit(buf, 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,
+};
+ATTRIBUTE_GROUPS(nilfs_segctor);
+
+NILFS_DEV_INT_GROUP_OPS(segctor, dev);
+NILFS_DEV_INT_GROUP_TYPE(segctor, dev);
+NILFS_DEV_INT_GROUP_FNS(segctor, dev);
+
+/************************************************************************
+ * NILFS superblock attrs *
+ ************************************************************************/
+
+static ssize_t
+nilfs_superblock_sb_write_time_show(struct nilfs_superblock_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ time64_t sbwtime;
+
+ down_read(&nilfs->ns_sem);
+ sbwtime = nilfs->ns_sbwtime;
+ up_read(&nilfs->ns_sem);
+
+ return sysfs_emit(buf, "%ptTs\n", &sbwtime);
+}
+
+static ssize_t
+nilfs_superblock_sb_write_time_secs_show(struct nilfs_superblock_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ time64_t sbwtime;
+
+ down_read(&nilfs->ns_sem);
+ sbwtime = nilfs->ns_sbwtime;
+ up_read(&nilfs->ns_sem);
+
+ return sysfs_emit(buf, "%llu\n", sbwtime);
+}
+
+static ssize_t
+nilfs_superblock_sb_write_count_show(struct nilfs_superblock_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ unsigned int sbwcount;
+
+ down_read(&nilfs->ns_sem);
+ sbwcount = nilfs->ns_sbwcount;
+ up_read(&nilfs->ns_sem);
+
+ return sysfs_emit(buf, "%u\n", sbwcount);
+}
+
+static ssize_t
+nilfs_superblock_sb_update_frequency_show(struct nilfs_superblock_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ unsigned int sb_update_freq;
+
+ down_read(&nilfs->ns_sem);
+ sb_update_freq = nilfs->ns_sb_update_freq;
+ up_read(&nilfs->ns_sem);
+
+ return sysfs_emit(buf, "%u\n", sb_update_freq);
+}
+
+static ssize_t
+nilfs_superblock_sb_update_frequency_store(struct nilfs_superblock_attr *attr,
+ struct the_nilfs *nilfs,
+ const char *buf, size_t count)
+{
+ unsigned int val;
+ int err;
+
+ err = kstrtouint(skip_spaces(buf), 0, &val);
+ if (err) {
+ nilfs_err(nilfs->ns_sb, "unable to convert string: err=%d",
+ err);
+ return err;
+ }
+
+ if (val < NILFS_SB_FREQ) {
+ val = NILFS_SB_FREQ;
+ nilfs_warn(nilfs->ns_sb,
+ "superblock update frequency cannot be lesser than 10 seconds");
+ }
+
+ down_write(&nilfs->ns_sem);
+ nilfs->ns_sb_update_freq = val;
+ up_write(&nilfs->ns_sem);
+
+ return count;
+}
+
+static const char sb_readme_str[] =
+ "The superblock group contains attributes that describe\n"
+ "superblock's details.\n\n"
+ "(1) sb_write_time\n\tshow previous write time of super block "
+ "in human-readable format.\n\n"
+ "(2) sb_write_time_secs\n\tshow previous write time of super block "
+ "in seconds.\n\n"
+ "(3) sb_write_count\n\tshow write count of super block.\n\n"
+ "(4) sb_update_frequency\n"
+ "\tshow/set interval of periodical update of superblock (in seconds).\n\n"
+ "\tYou can set preferable frequency of superblock update by command:\n\n"
+ "\t'echo <val> > /sys/fs/<nilfs>/<dev>/superblock/sb_update_frequency'\n";
+
+static ssize_t
+nilfs_superblock_README_show(struct nilfs_superblock_attr *attr,
+ struct the_nilfs *nilfs, char *buf)
+{
+ return sysfs_emit(buf, sb_readme_str);
+}
+
+NILFS_SUPERBLOCK_RO_ATTR(sb_write_time);
+NILFS_SUPERBLOCK_RO_ATTR(sb_write_time_secs);
+NILFS_SUPERBLOCK_RO_ATTR(sb_write_count);
+NILFS_SUPERBLOCK_RW_ATTR(sb_update_frequency);
+NILFS_SUPERBLOCK_RO_ATTR(README);
+
+static struct attribute *nilfs_superblock_attrs[] = {
+ NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time),
+ NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time_secs),
+ NILFS_SUPERBLOCK_ATTR_LIST(sb_write_count),
+ NILFS_SUPERBLOCK_ATTR_LIST(sb_update_frequency),
+ NILFS_SUPERBLOCK_ATTR_LIST(README),
+ NULL,
+};
+ATTRIBUTE_GROUPS(nilfs_superblock);
+
+NILFS_DEV_INT_GROUP_OPS(superblock, dev);
+NILFS_DEV_INT_GROUP_TYPE(superblock, dev);
+NILFS_DEV_INT_GROUP_FNS(superblock, dev);
+
+/************************************************************************
+ * NILFS device attrs *
+ ************************************************************************/
+
+static
+ssize_t nilfs_dev_revision_show(struct nilfs_dev_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ struct nilfs_super_block **sbp = nilfs->ns_sbp;
+ u32 major = le32_to_cpu(sbp[0]->s_rev_level);
+ u16 minor = le16_to_cpu(sbp[0]->s_minor_rev_level);
+
+ return sysfs_emit(buf, "%d.%d\n", major, minor);
+}
+
+static
+ssize_t nilfs_dev_blocksize_show(struct nilfs_dev_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ return sysfs_emit(buf, "%u\n", nilfs->ns_blocksize);
+}
+
+static
+ssize_t nilfs_dev_device_size_show(struct nilfs_dev_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ struct nilfs_super_block **sbp = nilfs->ns_sbp;
+ u64 dev_size = le64_to_cpu(sbp[0]->s_dev_size);
+
+ return sysfs_emit(buf, "%llu\n", dev_size);
+}
+
+static
+ssize_t nilfs_dev_free_blocks_show(struct nilfs_dev_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ sector_t free_blocks = 0;
+
+ nilfs_count_free_blocks(nilfs, &free_blocks);
+ return sysfs_emit(buf, "%llu\n",
+ (unsigned long long)free_blocks);
+}
+
+static
+ssize_t nilfs_dev_uuid_show(struct nilfs_dev_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ struct nilfs_super_block **sbp = nilfs->ns_sbp;
+
+ return sysfs_emit(buf, "%pUb\n", sbp[0]->s_uuid);
+}
+
+static
+ssize_t nilfs_dev_volume_name_show(struct nilfs_dev_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ struct nilfs_super_block **sbp = nilfs->ns_sbp;
+
+ return scnprintf(buf, sizeof(sbp[0]->s_volume_name), "%s\n",
+ sbp[0]->s_volume_name);
+}
+
+static const char dev_readme_str[] =
+ "The <device> group contains attributes that describe file system\n"
+ "partition's details.\n\n"
+ "(1) revision\n\tshow NILFS file system revision.\n\n"
+ "(2) blocksize\n\tshow volume block size in bytes.\n\n"
+ "(3) device_size\n\tshow volume size in bytes.\n\n"
+ "(4) free_blocks\n\tshow count of free blocks on volume.\n\n"
+ "(5) uuid\n\tshow volume's UUID.\n\n"
+ "(6) volume_name\n\tshow volume's name.\n\n";
+
+static ssize_t nilfs_dev_README_show(struct nilfs_dev_attr *attr,
+ struct the_nilfs *nilfs,
+ char *buf)
+{
+ return sysfs_emit(buf, dev_readme_str);
+}
+
+NILFS_DEV_RO_ATTR(revision);
+NILFS_DEV_RO_ATTR(blocksize);
+NILFS_DEV_RO_ATTR(device_size);
+NILFS_DEV_RO_ATTR(free_blocks);
+NILFS_DEV_RO_ATTR(uuid);
+NILFS_DEV_RO_ATTR(volume_name);
+NILFS_DEV_RO_ATTR(README);
+
+static struct attribute *nilfs_dev_attrs[] = {
+ NILFS_DEV_ATTR_LIST(revision),
+ NILFS_DEV_ATTR_LIST(blocksize),
+ NILFS_DEV_ATTR_LIST(device_size),
+ NILFS_DEV_ATTR_LIST(free_blocks),
+ NILFS_DEV_ATTR_LIST(uuid),
+ NILFS_DEV_ATTR_LIST(volume_name),
+ NILFS_DEV_ATTR_LIST(README),
+ NULL,
+};
+ATTRIBUTE_GROUPS(nilfs_dev);
+
+static ssize_t nilfs_dev_attr_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
+ ns_dev_kobj);
+ struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
+ attr);
+
+ return a->show ? a->show(a, nilfs, buf) : 0;
+}
+
+static ssize_t nilfs_dev_attr_store(struct kobject *kobj,
+ struct attribute *attr,
+ const char *buf, size_t len)
+{
+ struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
+ ns_dev_kobj);
+ struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
+ attr);
+
+ return a->store ? a->store(a, nilfs, buf, len) : 0;
+}
+
+static void nilfs_dev_attr_release(struct kobject *kobj)
+{
+ struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
+ ns_dev_kobj);
+ complete(&nilfs->ns_dev_kobj_unregister);
+}
+
+static const struct sysfs_ops nilfs_dev_attr_ops = {
+ .show = nilfs_dev_attr_show,
+ .store = nilfs_dev_attr_store,
+};
+
+static struct kobj_type nilfs_dev_ktype = {
+ .default_groups = nilfs_dev_groups,
+ .sysfs_ops = &nilfs_dev_attr_ops,
+ .release = nilfs_dev_attr_release,
+};
+
+int nilfs_sysfs_create_device_group(struct super_block *sb)
+{
+ struct the_nilfs *nilfs = sb->s_fs_info;
+ size_t devgrp_size = sizeof(struct nilfs_sysfs_dev_subgroups);
+ int err;
+
+ nilfs->ns_dev_subgroups = kzalloc(devgrp_size, GFP_KERNEL);
+ if (unlikely(!nilfs->ns_dev_subgroups)) {
+ err = -ENOMEM;
+ nilfs_err(sb, "unable to allocate memory for device group");
+ goto failed_create_device_group;
+ }
+
+ nilfs->ns_dev_kobj.kset = nilfs_kset;
+ init_completion(&nilfs->ns_dev_kobj_unregister);
+ err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL,
+ "%s", sb->s_id);
+ if (err)
+ goto cleanup_dev_kobject;
+
+ err = nilfs_sysfs_create_mounted_snapshots_group(nilfs);
+ if (err)
+ goto cleanup_dev_kobject;
+
+ err = nilfs_sysfs_create_checkpoints_group(nilfs);
+ if (err)
+ goto delete_mounted_snapshots_group;
+
+ 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;
+
+ err = nilfs_sysfs_create_segctor_group(nilfs);
+ if (err)
+ goto delete_superblock_group;
+
+ return 0;
+
+delete_superblock_group:
+ nilfs_sysfs_delete_superblock_group(nilfs);
+
+delete_segments_group:
+ nilfs_sysfs_delete_segments_group(nilfs);
+
+delete_checkpoints_group:
+ nilfs_sysfs_delete_checkpoints_group(nilfs);
+
+delete_mounted_snapshots_group:
+ nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
+
+cleanup_dev_kobject:
+ kobject_put(&nilfs->ns_dev_kobj);
+ kfree(nilfs->ns_dev_subgroups);
+
+failed_create_device_group:
+ return err;
+}
+
+void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
+{
+ nilfs_sysfs_delete_mounted_snapshots_group(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);
+ kobject_del(&nilfs->ns_dev_kobj);
+ kobject_put(&nilfs->ns_dev_kobj);
+ kfree(nilfs->ns_dev_subgroups);
+}
+
+/************************************************************************
+ * NILFS feature attrs *
+ ************************************************************************/
+
+static ssize_t nilfs_feature_revision_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ return sysfs_emit(buf, "%d.%d\n",
+ NILFS_CURRENT_REV, NILFS_MINOR_REV);
+}
+
+static const char features_readme_str[] =
+ "The features group contains attributes that describe NILFS file\n"
+ "system driver features.\n\n"
+ "(1) revision\n\tshow current revision of NILFS file system driver.\n";
+
+static ssize_t nilfs_feature_README_show(struct kobject *kobj,
+ struct attribute *attr,
+ char *buf)
+{
+ return sysfs_emit(buf, features_readme_str);
+}
+
+NILFS_FEATURE_RO_ATTR(revision);
+NILFS_FEATURE_RO_ATTR(README);
+
+static struct attribute *nilfs_feature_attrs[] = {
+ NILFS_FEATURE_ATTR_LIST(revision),
+ NILFS_FEATURE_ATTR_LIST(README),
+ NULL,
+};
+
+static const struct attribute_group nilfs_feature_attr_group = {
+ .name = "features",
+ .attrs = nilfs_feature_attrs,
+};
+
+int __init nilfs_sysfs_init(void)
+{
+ int err;
+
+ nilfs_kset = kset_create_and_add(NILFS_ROOT_GROUP_NAME, NULL, fs_kobj);
+ if (!nilfs_kset) {
+ err = -ENOMEM;
+ nilfs_err(NULL, "unable to create sysfs entry: err=%d", err);
+ goto failed_sysfs_init;
+ }
+
+ err = sysfs_create_group(&nilfs_kset->kobj, &nilfs_feature_attr_group);
+ if (unlikely(err)) {
+ nilfs_err(NULL, "unable to create feature group: err=%d", err);
+ goto cleanup_sysfs_init;
+ }
+
+ return 0;
+
+cleanup_sysfs_init:
+ kset_unregister(nilfs_kset);
+
+failed_sysfs_init:
+ return err;
+}
+
+void nilfs_sysfs_exit(void)
+{
+ sysfs_remove_group(&nilfs_kset->kobj, &nilfs_feature_attr_group);
+ kset_unregister(nilfs_kset);
+}