Merge "Support casefolded encryption" am: be27975fff am: db35eb2c53
Change-Id: I648288ddce8bf6a97f10a6ea7e3f74ab0e56fd77
diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index ed82066..3463a68 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -86,6 +86,7 @@
#define ZRAM_BACK_DEV "/sys/block/zram0/backing_dev"
#define SYSFS_EXT4_VERITY "/sys/fs/ext4/features/verity"
+#define SYSFS_EXT4_CASEFOLD "/sys/fs/ext4/features/casefold"
// FIXME: this should be in system/extras
#define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
@@ -123,6 +124,7 @@
FS_STAT_SET_RESERVED_BLOCKS_FAILED = 0x20000,
FS_STAT_ENABLE_ENCRYPTION_FAILED = 0x40000,
FS_STAT_ENABLE_VERITY_FAILED = 0x80000,
+ FS_STAT_ENABLE_CASEFOLD_FAILED = 0x100000,
};
static void log_fs_stat(const std::string& blk_device, int fs_stat) {
@@ -344,6 +346,7 @@
const struct ext4_super_block* sb, int* fs_stat) {
bool has_quota = (sb->s_feature_ro_compat & cpu_to_le32(EXT4_FEATURE_RO_COMPAT_QUOTA)) != 0;
bool want_quota = entry.fs_mgr_flags.quota;
+ bool want_projid = android::base::GetBoolProperty("ro.emulated_storage.projid", false);
if (has_quota == want_quota) {
return;
@@ -360,12 +363,16 @@
if (want_quota) {
LINFO << "Enabling quotas on " << blk_device;
argv[1] = "-Oquota";
- argv[2] = "-Qusrquota,grpquota";
+ // Once usr/grp unneeded, make just prjquota to save overhead
+ if (want_projid)
+ argv[2] = "-Qusrquota,grpquota,prjquota";
+ else
+ argv[2] = "-Qusrquota,grpquota";
*fs_stat |= FS_STAT_QUOTA_ENABLED;
} else {
LINFO << "Disabling quotas on " << blk_device;
argv[1] = "-O^quota";
- argv[2] = "-Q^usrquota,^grpquota";
+ argv[2] = "-Q^usrquota,^grpquota,^prjquota";
}
if (!run_tune2fs(argv, ARRAY_SIZE(argv))) {
@@ -498,6 +505,42 @@
}
}
+// Enable casefold if needed.
+static void tune_casefold(const std::string& blk_device, const struct ext4_super_block* sb,
+ int* fs_stat) {
+ bool has_casefold =
+ (sb->s_feature_ro_compat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_CASEFOLD)) != 0;
+ bool wants_casefold = android::base::GetBoolProperty("ro.emulated_storage.casefold", false);
+
+ if (!wants_casefold || has_casefold) return;
+
+ std::string casefold_support;
+ if (!android::base::ReadFileToString(SYSFS_EXT4_CASEFOLD, &casefold_support)) {
+ LERROR << "Failed to open " << SYSFS_EXT4_CASEFOLD;
+ return;
+ }
+
+ if (!(android::base::Trim(casefold_support) == "supported")) {
+ LERROR << "Current ext4 casefolding not supported by kernel";
+ return;
+ }
+
+ if (!tune2fs_available()) {
+ LERROR << "Unable to enable ext4 casefold on " << blk_device
+ << " because " TUNE2FS_BIN " is missing";
+ return;
+ }
+
+ LINFO << "Enabling ext4 casefold on " << blk_device;
+
+ const char* argv[] = {TUNE2FS_BIN, "-O", "casefold", "-E", "encoding=utf8", blk_device.c_str()};
+ if (!run_tune2fs(argv, ARRAY_SIZE(argv))) {
+ LERROR << "Failed to run " TUNE2FS_BIN " to enable "
+ << "ext4 casefold on " << blk_device;
+ *fs_stat |= FS_STAT_ENABLE_CASEFOLD_FAILED;
+ }
+}
+
// Read the primary superblock from an f2fs filesystem. On failure return
// false. If it's not an f2fs filesystem, also set FS_STAT_INVALID_MAGIC.
#define F2FS_BLKSIZE 4096
@@ -595,6 +638,7 @@
tune_reserved_size(blk_device, entry, &sb, &fs_stat);
tune_encrypt(blk_device, entry, &sb, &fs_stat);
tune_verity(blk_device, entry, &sb, &fs_stat);
+ tune_casefold(blk_device, &sb, &fs_stat);
}
}