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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/fs/nilfs2/sysfs.c

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C
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/*
* sysfs.c - sysfs support implementation.
*
* Copyright (C) 2005-2014 Nippon Telegraph and Telephone Corporation.
* Copyright (C) 2014 HGST, Inc., a Western Digital Company.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* 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_SHOW_TIME(time_t_val, buf) ({ \
struct tm res; \
int count = 0; \
time_to_tm(time_t_val, 0, &res); \
res.tm_year += 1900; \
res.tm_mon += 1; \
count = scnprintf(buf, PAGE_SIZE, \
"%ld-%.2d-%.2d %.2d:%.2d:%.2d\n", \
res.tm_year, res.tm_mon, res.tm_mday, \
res.tm_hour, res.tm_min, res.tm_sec);\
count; \
})
#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; \
struct the_nilfs *nilfs = container_of(kobj->parent, \
struct the_nilfs, \
ns_##parent_name##_kobj); \
subgroups = nilfs->ns_##parent_name##_subgroups; \
complete(&subgroups->sg_##name##_kobj_unregister); \
} \
static struct kobj_type nilfs_##name##_ktype = { \
.default_attrs = nilfs_##name##_attrs, \
.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) \
return err; \
return 0; \
} \
static void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \
{ \
kobject_del(&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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, 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,
};
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_attrs = nilfs_snapshot_attrs,
.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)
return err;
return 0;
}
void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *root)
{
kobject_del(&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 snprintf(buf, PAGE_SIZE, mounted_snapshots_readme_str);
}
NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(README);
static struct attribute *nilfs_mounted_snapshots_attrs[] = {
NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(README),
NULL,
};
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_msg(nilfs->ns_sb, KERN_ERR,
"unable to get checkpoint stat: err=%d", 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) {
nilfs_msg(nilfs->ns_sb, KERN_ERR,
"unable to get checkpoint stat: err=%d", 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_segctor_sem);
cno = nilfs->ns_cno;
up_read(&nilfs->ns_segctor_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 *
************************************************************************/
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) {
nilfs_msg(nilfs->ns_sb, KERN_ERR,
"unable to get segment stat: err=%d", 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 *
************************************************************************/
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_segctor_sem);
seg_seq = nilfs->ns_seg_seq;
up_read(&nilfs->ns_segctor_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_segctor_sem);
segnum = nilfs->ns_segnum;
up_read(&nilfs->ns_segctor_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_segctor_sem);
nextnum = nilfs->ns_nextnum;
up_read(&nilfs->ns_segctor_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_segctor_sem);
pseg_offset = nilfs->ns_pseg_offset;
up_read(&nilfs->ns_segctor_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_segctor_sem);
cno = nilfs->ns_cno;
up_read(&nilfs->ns_segctor_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_segctor_sem);
ctime = nilfs->ns_ctime;
up_read(&nilfs->ns_segctor_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_segctor_sem);
ctime = nilfs->ns_ctime;
up_read(&nilfs->ns_segctor_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_segctor_sem);
nongc_ctime = nilfs->ns_nongc_ctime;
up_read(&nilfs->ns_segctor_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_segctor_sem);
nongc_ctime = nilfs->ns_nongc_ctime;
up_read(&nilfs->ns_segctor_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_segctor_sem);
ndirtyblks = atomic_read(&nilfs->ns_ndirtyblks);
up_read(&nilfs->ns_segctor_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 *
************************************************************************/
static ssize_t
nilfs_superblock_sb_write_time_show(struct nilfs_superblock_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
time_t sbwtime;
down_read(&nilfs->ns_sem);
sbwtime = nilfs->ns_sbwtime;
up_read(&nilfs->ns_sem);
return NILFS_SHOW_TIME(sbwtime, buf);
}
static ssize_t
nilfs_superblock_sb_write_time_secs_show(struct nilfs_superblock_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
time_t sbwtime;
down_read(&nilfs->ns_sem);
sbwtime = nilfs->ns_sbwtime;
up_read(&nilfs->ns_sem);
return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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_msg(nilfs->ns_sb, KERN_ERR,
"unable to convert string: err=%d", err);
return err;
}
if (val < NILFS_SB_FREQ) {
val = NILFS_SB_FREQ;
nilfs_msg(nilfs->ns_sb, KERN_WARNING,
"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 snprintf(buf, PAGE_SIZE, 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,
};
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 snprintf(buf, PAGE_SIZE, "%d.%d\n", major, minor);
}
static
ssize_t nilfs_dev_blocksize_show(struct nilfs_dev_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, 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,
};
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_attrs = nilfs_dev_attrs,
.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_msg(sb, KERN_ERR,
"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 free_dev_subgroups;
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_del(&nilfs->ns_dev_kobj);
free_dev_subgroups:
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);
kfree(nilfs->ns_dev_subgroups);
}
/************************************************************************
* NILFS feature attrs *
************************************************************************/
static ssize_t nilfs_feature_revision_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, 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_msg(NULL, KERN_ERR,
"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_msg(NULL, KERN_ERR,
"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);
}
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