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fs_mgr: split out fs_mgr_overlayfs_teardown_one() 

In preparation for adding a list of possible backing storage.

Test: compile
Bug: 109821005
Change-Id: Id64d3630a646de714831a3c746204440324c206e
This commit is contained in:
Mark Salyzyn 2018-06-06 13:10:40 -07:00
parent 29e9833e39
commit 336f759959
1 changed files with 45 additions and 35 deletions
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80
fs_mgr/fs_mgr_overlayfs.cpp
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@ -344,6 +344,50 @@ bool fs_mgr_overlayfs_setup_one(const std::string& overlay, const std::string& m
return ret;
}
bool fs_mgr_overlayfs_teardown_one(const std::string& overlay, const std::string& mount_point,
bool* change) {
const auto top = overlay + kOverlayTopDir;
auto save_errno = errno;
auto missing = access(top.c_str(), F_OK);
errno = save_errno;
if (missing) return false;
const auto oldpath = top + (mount_point.empty() ? "" : ("/"s + mount_point));
const auto newpath = oldpath + ".teardown";
auto ret = fs_mgr_rm_all(newpath);
save_errno = errno;
if (!rename(oldpath.c_str(), newpath.c_str())) {
if (change) *change = true;
} else if (errno != ENOENT) {
ret = false;
PERROR << "mv " << oldpath << " " << newpath;
} else {
errno = save_errno;
}
ret &= fs_mgr_rm_all(newpath, change);
save_errno = errno;
if (!rmdir(newpath.c_str())) {
if (change) *change = true;
} else if (errno != ENOENT) {
ret = false;
PERROR << "rmdir " << newpath;
} else {
errno = save_errno;
}
if (!mount_point.empty()) {
save_errno = errno;
if (!rmdir(top.c_str())) {
if (change) *change = true;
} else if ((errno != ENOENT) && (errno != ENOTEMPTY)) {
ret = false;
PERROR << "rmdir " << top;
} else {
errno = save_errno;
}
}
return ret;
}
bool fs_mgr_overlayfs_mount(const std::string& mount_point) {
auto options = fs_mgr_get_overlayfs_options(mount_point);
if (options.empty()) return false;
@ -475,41 +519,7 @@ bool fs_mgr_overlayfs_teardown(const char* mount_point, bool* change) {
fs_mgr_read_fstab_default(), fs_mgr_free_fstab)
.get(),
mount_point);
auto ret = true;
const auto overlay = kOverlayMountPoint + kOverlayTopDir;
const auto oldpath = overlay + (mount_point ? "/"s + mount_point : ""s);
const auto newpath = oldpath + ".teardown";
ret &= fs_mgr_rm_all(newpath);
auto save_errno = errno;
if (!rename(oldpath.c_str(), newpath.c_str())) {
if (change) *change = true;
} else if (errno != ENOENT) {
ret = false;
PERROR << "mv " << oldpath << " " << newpath;
} else {
errno = save_errno;
}
ret &= fs_mgr_rm_all(newpath, change);
save_errno = errno;
if (!rmdir(newpath.c_str())) {
if (change) *change = true;
} else if (errno != ENOENT) {
ret = false;
PERROR << "rmdir " << newpath;
} else {
errno = save_errno;
}
if (mount_point) {
save_errno = errno;
if (!rmdir(overlay.c_str())) {
if (change) *change = true;
} else if ((errno != ENOENT) && (errno != ENOTEMPTY)) {
ret = false;
PERROR << "rmdir " << overlay;
} else {
errno = save_errno;
}
}
auto ret = fs_mgr_overlayfs_teardown_one(kOverlayMountPoint, mount_point ?: "", change);
if (!fs_mgr_wants_overlayfs()) {
// After obligatory teardown to make sure everything is clean, but if
// we didn't want overlayfs in the the first place, we do not want to