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authorArnd Bergmann <arnd@arndb.de>2017-10-20 17:34:42 +0300
committerArnd Bergmann <arnd@arndb.de>2019-12-18 20:07:32 +0300
commitf559935e7ce4e5d448bb6588f7fa82b0cc2cc2c0 (patch)
tree7f5b52dee60425b1be9bda95980f4f1675491387 /net/sunrpc/cache.c
parent294ec5b87a8aaef664efb00ba62e4ef6ca05707c (diff)
downloadlinux-f559935e7ce4e5d448bb6588f7fa82b0cc2cc2c0.tar.xz
nfs: use time64_t internally
The timestamps for the cache are all in boottime seconds, so they don't overflow 32-bit values, but the use of time_t is deprecated because it generally does overflow when used with wall-clock time. There are multiple possible ways of avoiding it: - leave time_t, which is safe here, but forces others to look into this code to determine that it is over and over. - use a more generic type, like 'int' or 'long', which is known to be sufficient here but loses the documentation of referring to timestamps - use ktime_t everywhere, and convert into seconds in the few places where we want realtime-seconds. The conversion is sometimes expensive, but not more so than the conversion we do today. - use time64_t to clarify that this code is safe. Nothing would change for 64-bit architectures, but it is slightly less efficient on 32-bit architectures. Without a clear winner of the three approaches above, this picks the last one, favouring readability over a small performance loss on 32-bit architectures. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'net/sunrpc/cache.c')
-rw-r--r--net/sunrpc/cache.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index f740cb51802a..d996bf872a7c 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -42,7 +42,7 @@ static bool cache_listeners_exist(struct cache_detail *detail);
static void cache_init(struct cache_head *h, struct cache_detail *detail)
{
- time_t now = seconds_since_boot();
+ time64_t now = seconds_since_boot();
INIT_HLIST_NODE(&h->cache_list);
h->flags = 0;
kref_init(&h->ref);
@@ -139,10 +139,10 @@ EXPORT_SYMBOL_GPL(sunrpc_cache_lookup_rcu);
static void cache_dequeue(struct cache_detail *detail, struct cache_head *ch);
-static void cache_fresh_locked(struct cache_head *head, time_t expiry,
+static void cache_fresh_locked(struct cache_head *head, time64_t expiry,
struct cache_detail *detail)
{
- time_t now = seconds_since_boot();
+ time64_t now = seconds_since_boot();
if (now <= detail->flush_time)
/* ensure it isn't immediately treated as expired */
now = detail->flush_time + 1;
@@ -274,7 +274,7 @@ int cache_check(struct cache_detail *detail,
struct cache_head *h, struct cache_req *rqstp)
{
int rv;
- long refresh_age, age;
+ time64_t refresh_age, age;
/* First decide return status as best we can */
rv = cache_is_valid(h);
@@ -288,7 +288,7 @@ int cache_check(struct cache_detail *detail,
rv = -ENOENT;
} else if (rv == -EAGAIN ||
(h->expiry_time != 0 && age > refresh_age/2)) {
- dprintk("RPC: Want update, refage=%ld, age=%ld\n",
+ dprintk("RPC: Want update, refage=%lld, age=%lld\n",
refresh_age, age);
if (!test_and_set_bit(CACHE_PENDING, &h->flags)) {
switch (cache_make_upcall(detail, h)) {
@@ -1404,7 +1404,7 @@ static int c_show(struct seq_file *m, void *p)
return cd->cache_show(m, cd, NULL);
ifdebug(CACHE)
- seq_printf(m, "# expiry=%ld refcnt=%d flags=%lx\n",
+ seq_printf(m, "# expiry=%lld refcnt=%d flags=%lx\n",
convert_to_wallclock(cp->expiry_time),
kref_read(&cp->ref), cp->flags);
cache_get(cp);
@@ -1477,7 +1477,7 @@ static ssize_t read_flush(struct file *file, char __user *buf,
char tbuf[22];
size_t len;
- len = snprintf(tbuf, sizeof(tbuf), "%lu\n",
+ len = snprintf(tbuf, sizeof(tbuf), "%llu\n",
convert_to_wallclock(cd->flush_time));
return simple_read_from_buffer(buf, count, ppos, tbuf, len);
}
@@ -1488,7 +1488,7 @@ static ssize_t write_flush(struct file *file, const char __user *buf,
{
char tbuf[20];
char *ep;
- time_t now;
+ time64_t now;
if (*ppos || count > sizeof(tbuf)-1)
return -EINVAL;