summaryrefslogtreecommitdiff
path: root/fs/fscache
diff options
context:
space:
mode:
authorDavid Howells <dhowells@redhat.com>2022-04-20 16:27:17 +0300
committerDavid Howells <dhowells@redhat.com>2022-07-05 18:12:55 +0300
commit85e4ea1049c70fb99de5c6057e835d151fb647da (patch)
treef9ee0ccef90f4ee18ded974f90bbbecd3dd42466 /fs/fscache
parent65aa5f6fd8a12e0a343aaf1815949a79a49e3f35 (diff)
downloadlinux-85e4ea1049c70fb99de5c6057e835d151fb647da.tar.xz
fscache: Fix invalidation/lookup race
If an NFS file is opened for writing and closed, fscache_invalidate() will be asked to invalidate the file - however, if the cookie is in the LOOKING_UP state (or the CREATING state), then request to invalidate doesn't get recorded for fscache_cookie_state_machine() to do something with. Fix this by making __fscache_invalidate() set a flag if it sees the cookie is in the LOOKING_UP state to indicate that we need to go to invalidation. Note that this requires a count on the n_accesses counter for the state machine, which that will release when it's done. fscache_cookie_state_machine() then shifts to the INVALIDATING state if it sees the flag. Without this, an nfs file can get corrupted if it gets modified locally and then read locally as the cache contents may not get updated. Fixes: d24af13e2e23 ("fscache: Implement cookie invalidation") Reported-by: Max Kellermann <mk@cm4all.com> Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Max Kellermann <mk@cm4all.com> Link: https://lore.kernel.org/r/YlWWbpW5Foynjllo@rabbit.intern.cm-ag [1]
Diffstat (limited to 'fs/fscache')
-rw-r--r--fs/fscache/cookie.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index 575a5ba07c0d..74920826d8f6 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -522,7 +522,14 @@ static void fscache_perform_lookup(struct fscache_cookie *cookie)
}
fscache_see_cookie(cookie, fscache_cookie_see_active);
- fscache_set_cookie_state(cookie, FSCACHE_COOKIE_STATE_ACTIVE);
+ spin_lock(&cookie->lock);
+ if (test_and_clear_bit(FSCACHE_COOKIE_DO_INVALIDATE, &cookie->flags))
+ __fscache_set_cookie_state(cookie,
+ FSCACHE_COOKIE_STATE_INVALIDATING);
+ else
+ __fscache_set_cookie_state(cookie, FSCACHE_COOKIE_STATE_ACTIVE);
+ spin_unlock(&cookie->lock);
+ wake_up_cookie_state(cookie);
trace = fscache_access_lookup_cookie_end;
out:
@@ -757,6 +764,9 @@ again_locked:
spin_lock(&cookie->lock);
}
+ if (test_and_clear_bit(FSCACHE_COOKIE_DO_INVALIDATE, &cookie->flags))
+ fscache_end_cookie_access(cookie, fscache_access_invalidate_cookie_end);
+
switch (state) {
case FSCACHE_COOKIE_STATE_RELINQUISHING:
fscache_see_cookie(cookie, fscache_cookie_see_relinquish);
@@ -1053,6 +1063,9 @@ void __fscache_invalidate(struct fscache_cookie *cookie,
return;
case FSCACHE_COOKIE_STATE_LOOKING_UP:
+ __fscache_begin_cookie_access(cookie, fscache_access_invalidate_cookie);
+ set_bit(FSCACHE_COOKIE_DO_INVALIDATE, &cookie->flags);
+ fallthrough;
case FSCACHE_COOKIE_STATE_CREATING:
spin_unlock(&cookie->lock);
_leave(" [look %x]", cookie->inval_counter);