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Merge "cryptfs: try harder to unmount subdirectory mounts" am: 827dfe6e75

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Original change: https://android-review.googlesource.com/c/platform/system/vold/+/1729173

Change-Id: Ia4e3e045742d5aa15fb25d20c027911a84872195
This commit is contained in:
Treehugger Robot 2021-06-08 19:59:37 +00:00 committed by Automerger Merge Worker
commit bf28ef63eb
1 changed files with 7 additions and 4 deletions
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11
cryptfs.cpp
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@ -1508,20 +1508,23 @@ static void ensure_subdirectory_unmounted(const char *prefix) {
[](const std::string& s1, const std::string& s2) {return s1.length() > s2.length(); });
for (std::string& mount_point : umount_points) {
umount(mount_point.c_str());
SLOGW("umount sub-directory mount %s\n", mount_point.c_str());
SLOGW("unmounting sub-directory mount %s\n", mount_point.c_str());
if (umount(mount_point.c_str()) != 0) {
SLOGE("unmounting %s failed: %s\n", mount_point.c_str(), strerror(errno));
}
}
}
static int wait_and_unmount(const char* mountpoint) {
int i, err, rc;
// Subdirectory mount will cause a failure of umount.
ensure_subdirectory_unmounted(mountpoint);
#define WAIT_UNMOUNT_COUNT 20
/* Now umount the tmpfs filesystem */
for (i = 0; i < WAIT_UNMOUNT_COUNT; i++) {
// Subdirectory mount will cause a failure of umount.
ensure_subdirectory_unmounted(mountpoint);
if (umount(mountpoint) == 0) {
break;
}