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nilfs2: use time64_t internally

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The superblock and segment timestamps are used only internally in nilfs2
and can be read out using sysfs.

Since we are using the old 'get_seconds()' interface and store the data
as timestamps, the behavior differs slightly between 64-bit and 32-bit
kernels, the latter will show incorrect timestamps after 2038 in sysfs,
and presumably fail completely in 2106 as comparisons go wrong.

This changes nilfs2 to use time64_t with ktime_get_real_seconds() to
handle timestamps, making the behavior consistent and correct on both
32-bit and 64-bit machines.

The on-disk format already uses 64-bit timestamps, so nothing changes
there.

Link: http://lkml.kernel.org/r/20180122211050.1286441-1-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Arnd Bergmann 2018-02-06 15:39:21 -08:00 committed by Linus Torvalds
parent ca3a45697b
commit fb04b91bc2
9 changed files with 23 additions and 24 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
fs/nilfs2/segbuf.c
View file

@ -130,7 +130,7 @@ int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *segbuf,
}
int nilfs_segbuf_reset(struct nilfs_segment_buffer *segbuf, unsigned int flags,
time_t ctime, __u64 cno)
time64_t ctime, __u64 cno)
{
int err;

4
fs/nilfs2/segbuf.h
View file

@ -46,7 +46,7 @@ struct nilfs_segsum_info {
unsigned long nfileblk;
u64 seg_seq;
__u64 cno;
time_t ctime;
time64_t ctime;
sector_t next;
};
@ -120,7 +120,7 @@ void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
struct nilfs_segment_buffer *prev);
void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64,
struct the_nilfs *);
int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned int, time_t,
int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned int, time64_t,
__u64);
int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *);
int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *,

2
fs/nilfs2/segment.c
View file

@ -2040,7 +2040,7 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
goto out;
/* Update time stamp */
sci->sc_seg_ctime = get_seconds();
sci->sc_seg_ctime = ktime_get_real_seconds();
err = nilfs_segctor_collect(sci, nilfs, mode);
if (unlikely(err))

2
fs/nilfs2/segment.h
View file

@ -157,7 +157,7 @@ struct nilfs_sc_info {
unsigned long sc_blk_cnt;
unsigned long sc_datablk_cnt;
unsigned long sc_nblk_this_inc;
time_t sc_seg_ctime;
time64_t sc_seg_ctime;
__u64 sc_cno;
unsigned long sc_flags;

2
fs/nilfs2/sufile.c
View file

@ -526,7 +526,7 @@ int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
* @modtime: modification time (option)
*/
int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
unsigned long nblocks, time_t modtime)
unsigned long nblocks, time64_t modtime)
{
struct buffer_head *bh;
struct nilfs_segment_usage *su;

2
fs/nilfs2/sufile.h
View file

@ -35,7 +35,7 @@ int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end);
int nilfs_sufile_alloc(struct inode *, __u64 *);
int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
unsigned long nblocks, time_t modtime);
unsigned long nblocks, time64_t modtime);
int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned int,
size_t);

4
fs/nilfs2/super.c
View file

@ -283,10 +283,10 @@ int nilfs_commit_super(struct super_block *sb, int flag)
{
struct the_nilfs *nilfs = sb->s_fs_info;
struct nilfs_super_block **sbp = nilfs->ns_sbp;
time_t t;
time64_t t;
/* nilfs->ns_sem must be locked by the caller. */
t = get_seconds();
t = ktime_get_real_seconds();
nilfs->ns_sbwtime = t;
sbp[0]->s_wtime = cpu_to_le64(t);
sbp[0]->s_sum = 0;

21
fs/nilfs2/sysfs.c
View file

@ -31,7 +31,7 @@ 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); \
time64_to_tm(time_t_val, 0, &res); \
res.tm_year += 1900; \
res.tm_mon += 1; \
count = scnprintf(buf, PAGE_SIZE, \
@ -579,7 +579,7 @@ nilfs_segctor_last_seg_write_time_show(struct nilfs_segctor_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
time_t ctime;
time64_t ctime;
down_read(&nilfs->ns_segctor_sem);
ctime = nilfs->ns_ctime;
@ -593,13 +593,13 @@ nilfs_segctor_last_seg_write_time_secs_show(struct nilfs_segctor_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
time_t ctime;
time64_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);
return snprintf(buf, PAGE_SIZE, "%llu\n", ctime);
}
static ssize_t
@ -607,7 +607,7 @@ nilfs_segctor_last_nongc_write_time_show(struct nilfs_segctor_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
time_t nongc_ctime;
time64_t nongc_ctime;
down_read(&nilfs->ns_segctor_sem);
nongc_ctime = nilfs->ns_nongc_ctime;
@ -621,14 +621,13 @@ nilfs_segctor_last_nongc_write_time_secs_show(struct nilfs_segctor_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
time_t nongc_ctime;
time64_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);
return snprintf(buf, PAGE_SIZE, "%llu\n", nongc_ctime);
}
static ssize_t
@ -728,7 +727,7 @@ nilfs_superblock_sb_write_time_show(struct nilfs_superblock_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
time_t sbwtime;
time64_t sbwtime;
down_read(&nilfs->ns_sem);
sbwtime = nilfs->ns_sbwtime;
@ -742,13 +741,13 @@ nilfs_superblock_sb_write_time_secs_show(struct nilfs_superblock_attr *attr,
struct the_nilfs *nilfs,
char *buf)
{
time_t sbwtime;
time64_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);
return snprintf(buf, PAGE_SIZE, "%llu\n", sbwtime);
}
static ssize_t

8
fs/nilfs2/the_nilfs.h
View file

@ -116,7 +116,7 @@ struct the_nilfs {
*/
struct buffer_head *ns_sbh[2];
struct nilfs_super_block *ns_sbp[2];
time_t ns_sbwtime;
time64_t ns_sbwtime;
unsigned int ns_sbwcount;
unsigned int ns_sbsize;
unsigned int ns_mount_state;
@ -131,8 +131,8 @@ struct the_nilfs {
__u64 ns_nextnum;
unsigned long ns_pseg_offset;
__u64 ns_cno;
time_t ns_ctime;
time_t ns_nongc_ctime;
time64_t ns_ctime;
time64_t ns_nongc_ctime;
atomic_t ns_ndirtyblks;
/*
@ -267,7 +267,7 @@ struct nilfs_root {
static inline int nilfs_sb_need_update(struct the_nilfs *nilfs)
{
u64 t = get_seconds();
u64 t = ktime_get_real_seconds();
return t < nilfs->ns_sbwtime ||
t > nilfs->ns_sbwtime + nilfs->ns_sb_update_freq;