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f2fs: support f2fs by setting unmovable bit for package file

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This enables to use uncrypt for f2fs update-on-reboot.
It requires kernel patch named:
    "f2fs: add an ioctl to disable GC for specific file"

If any operation fails during uncrypt, please delete package file as soon as
possible, and create the file again to move forward. IOWs, don't leave the
package file for a long time.

Bug: 70309376
Bug: 30170612
Change-Id: I3b4233e7da756f107be35364521699deaf2e7139
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
This commit is contained in:
Jaegeuk Kim 2017-12-08 13:19:23 -08:00
parent 3537a2659e
commit b6e6ee7587
1 changed files with 38 additions and 4 deletions
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42
uncrypt/uncrypt.cpp
View file

@ -172,10 +172,15 @@ static struct fstab* read_fstab() {
return fstab;
}
static const char* find_block_device(const char* path, bool* encryptable, bool* encrypted) {
static const char* find_block_device(const char* path, bool* encryptable,
bool* encrypted, bool* f2fs_fs) {
// Look for a volume whose mount point is the prefix of path and
// return its block device. Set encrypted if it's currently
// encrypted.
// ensure f2fs_fs is set to false first.
*f2fs_fs = false;
for (int i = 0; i < fstab->num_entries; ++i) {
struct fstab_rec* v = &fstab->recs[i];
if (!v->mount_point) {
@ -192,6 +197,9 @@ static const char* find_block_device(const char* path, bool* encryptable, bool*
*encrypted = true;
}
}
if (strcmp(v->fs_type, "f2fs") == 0) {
*f2fs_fs = true;
}
return v->blk_device;
}
}
@ -244,7 +252,7 @@ static int retry_fibmap(const int fd, const char* name, int* block, const int he
}
static int produce_block_map(const char* path, const char* map_file, const char* blk_dev,
bool encrypted, int socket) {
bool encrypted, bool f2fs_fs, int socket) {
std::string err;
if (!android::base::RemoveFileIfExists(map_file, &err)) {
LOG(ERROR) << "failed to remove the existing map file " << map_file << ": " << err;
@ -307,6 +315,31 @@ static int produce_block_map(const char* path, const char* map_file, const char*
}
}
// F2FS-specific ioctl
// It requires the below kernel commit merged in v4.16-rc1.
// 1ad71a27124c ("f2fs: add an ioctl to disable GC for specific file")
// In android-4.4,
// 56ee1e817908 ("f2fs: updates on v4.16-rc1")
// In android-4.9,
// 2f17e34672a8 ("f2fs: updates on v4.16-rc1")
// In android-4.14,
// ce767d9a55bc ("f2fs: updates on v4.16-rc1")
#ifndef F2FS_IOC_SET_PIN_FILE
#ifndef F2FS_IOCTL_MAGIC
#define F2FS_IOCTL_MAGIC 0xf5
#endif
#define F2FS_IOC_SET_PIN_FILE _IOW(F2FS_IOCTL_MAGIC, 13, __u32)
#define F2FS_IOC_GET_PIN_FILE _IOW(F2FS_IOCTL_MAGIC, 14, __u32)
#endif
if (f2fs_fs) {
int error = ioctl(fd, F2FS_IOC_SET_PIN_FILE);
// Don't break the old kernels which don't support it.
if (error && errno != ENOTTY && errno != ENOTSUP) {
PLOG(ERROR) << "Failed to set pin_file for f2fs: " << path << " on " << blk_dev;
return kUncryptIoctlError;
}
}
off64_t pos = 0;
int last_progress = 0;
while (pos < sb.st_size) {
@ -458,7 +491,8 @@ static int uncrypt(const char* input_path, const char* map_file, const int socke
bool encryptable;
bool encrypted;
const char* blk_dev = find_block_device(path, &encryptable, &encrypted);
bool f2fs_fs;
const char* blk_dev = find_block_device(path, &encryptable, &encrypted, &f2fs_fs);
if (blk_dev == nullptr) {
LOG(ERROR) << "failed to find block device for " << path;
return kUncryptBlockDeviceFindError;
@ -479,7 +513,7 @@ static int uncrypt(const char* input_path, const char* map_file, const int socke
// and /sdcard we leave the file alone.
if (strncmp(path, "/data/", 6) == 0) {
LOG(INFO) << "writing block map " << map_file;
return produce_block_map(path, map_file, blk_dev, encrypted, socket);
return produce_block_map(path, map_file, blk_dev, encrypted, f2fs_fs, socket);
}
return 0;