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Drop inode and page caches after evicting CE key.

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am: b350ed02d5

Change-Id: I84b60141c240eb03162dacd9a563cbc8bc006cd7
This commit is contained in:
Pavel Grafov 2017-08-03 13:09:53 +00:00 committed by android-build-merger
commit 1565a1d365
1 changed files with 12 additions and 0 deletions
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12
Ext4Crypt.cpp
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@ -30,6 +30,7 @@
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include <selinux/android.h>
#include <sys/mount.h>
@ -54,6 +55,7 @@
#include <android-base/stringprintf.h>
using android::base::StringPrintf;
using android::base::WriteStringToFile;
using android::vold::kEmptyAuthentication;
// NOTE: keep in sync with StorageManager
@ -399,6 +401,15 @@ bool e4crypt_vold_create_user_key(userid_t user_id, int serial, bool ephemeral)
return true;
}
static void drop_caches() {
// Clean any dirty pages (otherwise they won't be dropped).
sync();
// Drop inode and page caches.
if (!WriteStringToFile("3", "/proc/sys/vm/drop_caches")) {
PLOG(ERROR) << "Failed to drop caches during key eviction";
}
}
static bool evict_ce_key(userid_t user_id) {
s_ce_keys.erase(user_id);
bool success = true;
@ -406,6 +417,7 @@ static bool evict_ce_key(userid_t user_id) {
// If we haven't loaded the CE key, no need to evict it.
if (lookup_key_ref(s_ce_key_raw_refs, user_id, &raw_ref)) {
success &= android::vold::evictKey(raw_ref);
drop_caches();
}
s_ce_key_raw_refs.erase(user_id);
return success;