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ubifs: tnc: use monotonic znode timestamp

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The tnc uses get_seconds() based timestamps to check the age of a znode,
which has two problems: on 32-bit architectures this may overflow in
2038 or 2106, and it gives incorrect information when the system time
is updated using settimeofday().

Using montonic timestamps with ktime_get_seconds() solves both thes
problems.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Arnd Bergmann 2018-07-13 16:31:56 +02:00 committed by Richard Weinberger
parent 0eca0b8067
commit 6cff573202
4 changed files with 5 additions and 5 deletions
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2
fs/ubifs/shrinker.c
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@ -71,7 +71,7 @@ static int shrink_tnc(struct ubifs_info *c, int nr, int age, int *contention)
{
int total_freed = 0;
struct ubifs_znode *znode, *zprev;
int time = get_seconds();
time64_t time = ktime_get_seconds();
ubifs_assert(mutex_is_locked(&c->umount_mutex));
ubifs_assert(mutex_is_locked(&c->tnc_mutex));

4
fs/ubifs/tnc.c
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@ -1179,7 +1179,7 @@ int ubifs_lookup_level0(struct ubifs_info *c, const union ubifs_key *key,
{
int err, exact;
struct ubifs_znode *znode;
unsigned long time = get_seconds();
time64_t time = ktime_get_seconds();
dbg_tnck(key, "search key ");
ubifs_assert(key_type(c, key) < UBIFS_INVALID_KEY);
@ -1315,7 +1315,7 @@ static int lookup_level0_dirty(struct ubifs_info *c, const union ubifs_key *key,
{
int err, exact;
struct ubifs_znode *znode;
unsigned long time = get_seconds();
time64_t time = ktime_get_seconds();
dbg_tnck(key, "search and dirty key ");

2
fs/ubifs/tnc_misc.c
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@ -435,7 +435,7 @@ struct ubifs_znode *ubifs_load_znode(struct ubifs_info *c,
zbr->znode = znode;
znode->parent = parent;
znode->time = get_seconds();
znode->time = ktime_get_seconds();
znode->iip = iip;
return znode;

2
fs/ubifs/ubifs.h
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@ -758,7 +758,7 @@ struct ubifs_znode {
struct ubifs_znode *parent;
struct ubifs_znode *cnext;
unsigned long flags;
unsigned long time;
time64_t time;
int level;
int child_cnt;
int iip;