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fs:affs:Replace time_t with time64_t

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The affs code uses "time_t" and "get_seconds()". This will cause
problems on 32-bit architectures in 2038 when time_t overflows.
This patch replaces them with "time64_t" and
"ktime_get_real_seconds()". This patch introduces expensive 64-bit
divsion in "secs_to_datestamp()", considering this function is not
called so often, the cost should be acceptable.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: DengChao <chao.deng@linaro.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
DengChao 2015-11-12 21:40:41 +08:00 committed by Al Viro
parent 8f5fed1e91
commit db39c16724
3 changed files with 9 additions and 8 deletions
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2
fs/affs/affs.h
View File

@ -138,7 +138,7 @@ extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
extern int affs_remove_header(struct dentry *dentry);
extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
extern void secs_to_datestamp(time_t secs, struct affs_date *ds);
extern void secs_to_datestamp(time64_t secs, struct affs_date *ds);
extern umode_t prot_to_mode(u32 prot);
extern void mode_to_prot(struct inode *inode);
__printf(3, 4)

13
fs/affs/amigaffs.c
View File

@ -8,6 +8,7 @@
* Please send bug reports to: hjw@zvw.de
*/
#include <linux/math64.h>
#include "affs.h"
/*
@ -366,22 +367,22 @@ affs_fix_checksum(struct super_block *sb, struct buffer_head *bh)
}
void
secs_to_datestamp(time_t secs, struct affs_date *ds)
secs_to_datestamp(time64_t secs, struct affs_date *ds)
{
u32 days;
u32 minute;
s32 rem;
secs -= sys_tz.tz_minuteswest * 60 + ((8 * 365 + 2) * 24 * 60 * 60);
if (secs < 0)
secs = 0;
days = secs / 86400;
secs -= days * 86400;
minute = secs / 60;
secs -= minute * 60;
days = div_s64_rem(secs, 86400, &rem);
minute = rem / 60;
rem -= minute * 60;
ds->days = cpu_to_be32(days);
ds->mins = cpu_to_be32(minute);
ds->ticks = cpu_to_be32(secs * 50);
ds->ticks = cpu_to_be32(rem * 50);
}
umode_t

2
fs/affs/super.c
View File

@ -32,7 +32,7 @@ affs_commit_super(struct super_block *sb, int wait)
struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
lock_buffer(bh);
secs_to_datestamp(get_seconds(), &tail->disk_change);
secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
affs_fix_checksum(sb, bh);
unlock_buffer(bh);