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fscache: Introduce fscache_cookie_is_dropped() 

Bugzilla: http://bugzilla.redhat.com/1229736

commit 5c4588aea6675b69e328d468c5b6be5127e19a79
Author: Yue Hu <zbestahu@gmail.com>
Date:   Wed May 25 10:51:50 2022 +0800

    fscache: Introduce fscache_cookie_is_dropped()

    FSCACHE_COOKIE_STATE_DROPPED will be read more than once, so let's add a
    helper to avoid code duplication.

    Signed-off-by: Yue Hu <huyue2@coolpad.com>
    Signed-off-by: David Howells <dhowells@redhat.com>
    Link: https://listman.redhat.com/archives/linux-cachefs/2022-May/006919.html

Signed-off-by: Jeffrey Layton <jlayton@redhat.com>
This commit is contained in:
Jeffrey Layton 2022-07-12 13:24:40 -04:00
parent 4e5007697b
commit a977c5f4b1
1 changed files with 8 additions and 3 deletions
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11
fs/fscache/cookie.c
View File

@ -372,17 +372,22 @@ nomem:
return NULL;
}
static inline bool fscache_cookie_is_dropped(struct fscache_cookie *cookie)
{
return READ_ONCE(cookie->state) == FSCACHE_COOKIE_STATE_DROPPED;
}
static void fscache_wait_on_collision(struct fscache_cookie *candidate,
struct fscache_cookie *wait_for)
{
enum fscache_cookie_state *statep = &wait_for->state;
wait_var_event_timeout(statep, READ_ONCE(*statep) == FSCACHE_COOKIE_STATE_DROPPED,
wait_var_event_timeout(statep, fscache_cookie_is_dropped(wait_for),
20 * HZ);
if (READ_ONCE(*statep) != FSCACHE_COOKIE_STATE_DROPPED) {
if (!fscache_cookie_is_dropped(wait_for)) {
pr_notice("Potential collision c=%08x old: c=%08x",
candidate->debug_id, wait_for->debug_id);
wait_var_event(statep, READ_ONCE(*statep) == FSCACHE_COOKIE_STATE_DROPPED);
wait_var_event(statep, fscache_cookie_is_dropped(wait_for));
}
}