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linux/fs/nilfs2/sysfs.c
Ryusuke Konishi 6834082589 nilfs2: protect references to superblock parameters exposed in sysfs
The superblock buffers of nilfs2 can not only be overwritten at runtime
for modifications/repairs, but they are also regularly swapped, replaced
during resizing, and even abandoned when degrading to one side due to
backing device issues.  So, accessing them requires mutual exclusion using
the reader/writer semaphore "nilfs->ns_sem".

Some sysfs attribute show methods read this superblock buffer without the
necessary mutual exclusion, which can cause problems with pointer
dereferencing and memory access, so fix it.

Link: https://lkml.kernel.org/r/20240811100320.9913-1-konishi.ryusuke@gmail.com
Fixes: da7141fb78 ("nilfs2: add /sys/fs/nilfs2/<device> group")
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-09-01 17:59:00 -07:00

1141 lines
31 KiB
C

// 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 const 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 const 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 *raw_sb;
u32 major;
u16 minor;
down_read(&nilfs->ns_sem);
raw_sb = nilfs->ns_sbp[0];
major = le32_to_cpu(raw_sb->s_rev_level);
minor = le16_to_cpu(raw_sb->s_minor_rev_level);
up_read(&nilfs->ns_sem);
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 *raw_sb;
u64 dev_size;
down_read(&nilfs->ns_sem);
raw_sb = nilfs->ns_sbp[0];
dev_size = le64_to_cpu(raw_sb->s_dev_size);
up_read(&nilfs->ns_sem);
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 *raw_sb;
ssize_t len;
down_read(&nilfs->ns_sem);
raw_sb = nilfs->ns_sbp[0];
len = sysfs_emit(buf, "%pUb\n", raw_sb->s_uuid);
up_read(&nilfs->ns_sem);
return len;
}
static
ssize_t nilfs_dev_volume_name_show(struct nilfs_dev_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
struct nilfs_super_block *raw_sb;
ssize_t len;
down_read(&nilfs->ns_sem);
raw_sb = nilfs->ns_sbp[0];
len = scnprintf(buf, sizeof(raw_sb->s_volume_name), "%s\n",
raw_sb->s_volume_name);
up_read(&nilfs->ns_sem);
return len;
}
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 const 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);
}