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ASEC resize tweaking, allow read-write mounting.

Browse source 
Resize is no-op when sector count is unchanged; the caller can't
anticipate how vold does its sector calculations.

After resizing, we need to mount the container read-write, so allow
the caller to request "ro" or "rw" mode.

Handle ENOTSUP when trying to fallocate() on some filesystems

Bug: 16514385
Change-Id: I0d3a378280d4c36d14f8108ff428102283d583fa
This commit is contained in:
Jeff Sharkey 2014-08-22 12:29:05 -07:00
parent e82df164e8
commit 43ed123d3f
4 changed files with 16 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
CommandListener.cpp
View file

@ -403,12 +403,16 @@ int CommandListener::AsecCmd::runCommand(SocketClient *cli,
rc = vm->destroyAsec(argv[2], force);
} else if (!strcmp(argv[1], "mount")) {
dumpArgs(argc, argv, 3);
if (argc != 5) {
if (argc != 6) {
cli->sendMsg(ResponseCode::CommandSyntaxError,
"Usage: asec mount <namespace-id> <key> <ownerUid>", false);
"Usage: asec mount <namespace-id> <key> <ownerUid> <ro|rw>", false);
return 0;
}
rc = vm->mountAsec(argv[2], argv[3], atoi(argv[4]));
bool readOnly = true;
if (!strcmp(argv[5], "rw")) {
readOnly = false;
}
rc = vm->mountAsec(argv[2], argv[3], atoi(argv[4]), readOnly);
} else if (!strcmp(argv[1], "unmount")) {
dumpArgs(argc, argv, -1);
if (argc < 3) {

2
Loop.cpp
View file

@ -260,7 +260,7 @@ int Loop::resizeImageFile(const char *file, unsigned int numSectors) {
SLOGD("Attempting to increase size of %s to %d sectors.", file, numSectors);
if (fallocate(fd, 0, 0, numSectors * 512)) {
if (errno == ENOSYS) {
if (errno == ENOSYS || errno == ENOTSUP) {
SLOGW("fallocate not found. Falling back to ftruncate.");
if (ftruncate(fd, numSectors * 512) < 0) {
SLOGE("Error truncating imagefile (%s)", strerror(errno));

11
VolumeManager.cpp
View file

@ -641,7 +641,10 @@ int VolumeManager::resizeAsec(const char *id, unsigned numSectors, const char *k
* add one block for the superblock
*/
SLOGD("Resizing from %d sectors to %d sectors", oldNumSec, numImgSectors + 1);
if (oldNumSec >= numImgSectors + 1) {
if (oldNumSec == numImgSectors + 1) {
SLOGW("Size unchanged; ignoring resize request");
return 0;
} else if (oldNumSec > numImgSectors + 1) {
SLOGE("Only growing is currently supported.");
close(fd);
return -1;
@ -1249,7 +1252,7 @@ int VolumeManager::findAsec(const char *id, char *asecPath, size_t asecPathLen,
return 0;
}
int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) {
int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid, bool readOnly) {
char asecFileName[255];
char mountPoint[255];
@ -1330,9 +1333,9 @@ int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) {
int result;
if (sb.c_opts & ASEC_SB_C_OPTS_EXT4) {
result = Ext4::doMount(dmDevice, mountPoint, true, false, true);
result = Ext4::doMount(dmDevice, mountPoint, readOnly, false, readOnly);
} else {
result = Fat::doMount(dmDevice, mountPoint, true, false, true, ownerUid, 0, 0222, false);
result = Fat::doMount(dmDevice, mountPoint, readOnly, false, readOnly, ownerUid, 0, 0222, false);
}
if (result) {

2
VolumeManager.h
View file

@ -106,7 +106,7 @@ public:
*/
int fixupAsecPermissions(const char *id, gid_t gid, const char* privateFilename);
int destroyAsec(const char *id, bool force);
int mountAsec(const char *id, const char *key, int ownerUid);
int mountAsec(const char *id, const char *key, int ownerUid, bool readOnly);
int unmountAsec(const char *id, bool force);
int renameAsec(const char *id1, const char *id2);
int getAsecMountPath(const char *id, char *buffer, int maxlen);