fs_mgr: adding fs_mgr_get_slot_suffix() public API (c1f9cbaf) · Commits · e / os / android_system_core

fs_mgr/fs_mgr_avb.cpp

+3 −9

Original line number	Diff line number	Diff line
		@@ -490,14 +490,8 @@ int fs_mgr_load_vbmeta_images(struct fstab* fstab) {
		// of HASH partitions into fs_mgr_avb_verify_data, which is not required as
		// fs_mgr only deals with HASHTREE partitions.
		const char* requested_partitions[] = {nullptr};
		std::string ab_suffix;
		std::string slot;
		if (fs_mgr_get_boot_config("slot", &slot)) {
		ab_suffix = "_" + slot;
		} else {
		// remove slot_suffix once bootloaders update to new androidboot.slot param
		fs_mgr_get_boot_config("slot_suffix", &ab_suffix);
		}
		std::string ab_suffix = fs_mgr_get_slot_suffix();

		AvbSlotVerifyResult verify_result =
		avb_slot_verify(fs_mgr_avb_ops, requested_partitions, ab_suffix.c_str(),
		fs_mgr_vbmeta_prop.allow_verification_error, &fs_mgr_avb_verify_data);

fs_mgr/fs_mgr_fstab.cpp

+1 −1

Original line number	Diff line number	Diff line
		@@ -572,7 +572,7 @@ static struct fstab fs_mgr_read_fstab_file(FILE fstab_file)
		cnt++;
		}
		/* If an A/B partition, modify block device to be the real block device */
		if (fs_mgr_update_for_slotselect(fstab) != 0) {
		if (!fs_mgr_update_for_slotselect(fstab)) {
		LERROR << "Error updating for slotselect";
		goto err;
		}

fs_mgr/fs_mgr_priv.h

+1 −5

Original line number	Diff line number	Diff line
		@@ -41,8 +41,6 @@
		#define PWARNING PLOG(WARNING) << FS_MGR_TAG
		#define PERROR PLOG(ERROR) << FS_MGR_TAG

		__BEGIN_DECLS

		#define CRYPTO_TMPFS_OPTIONS "size=256m,mode=0771,uid=1000,gid=1000"

		#define WAIT_TIMEOUT 20
		@@ -114,10 +112,8 @@ __BEGIN_DECLS

		int fs_mgr_set_blk_ro(const char *blockdev);
		int fs_mgr_test_access(const char *device);
		int fs_mgr_update_for_slotselect(struct fstab *fstab);
		bool fs_mgr_update_for_slotselect(struct fstab *fstab);
		bool is_dt_compatible();
		bool is_device_secure();

		__END_DECLS

		#endif /* __CORE_FS_MGR_PRIV_H */

fs_mgr/fs_mgr_slotselect.cpp

+28 −18

Original line number	Diff line number	Diff line
		@@ -16,37 +16,47 @@

		#include <stdio.h>

		#include <string>

		#include "fs_mgr.h"
		#include "fs_mgr_priv.h"

		// Updates \|fstab\| for slot_suffix. Returns 0 on success, -1 on error.
		int fs_mgr_update_for_slotselect(struct fstab *fstab)
		{
		// Returns "_a" or "_b" based on two possible values in kernel cmdline:
		// - androidboot.slot = a or b OR
		// - androidboot.slot_suffix = _a or _b
		// TODO: remove slot_suffix once it's deprecated.
		std::string fs_mgr_get_slot_suffix() {
		std::string slot;
		std::string ab_suffix;

		if (fs_mgr_get_boot_config("slot", &slot)) {
		ab_suffix = "_" + slot;
		} else if (!fs_mgr_get_boot_config("slot_suffix", &ab_suffix)) {
		ab_suffix = "";
		}
		return ab_suffix;
		}

		// Updates \|fstab\| for slot_suffix. Returns true on success, false on error.
		bool fs_mgr_update_for_slotselect(struct fstab *fstab) {
		int n;
		int got_suffix = 0;
		std::string suffix;
		std::string ab_suffix;

		for (n = 0; n < fstab->num_entries; n++) {
		if (fstab->recs[n].fs_mgr_flags & MF_SLOTSELECT) {
		char *tmp;

		if (!got_suffix) {
		std::string slot;
		if (fs_mgr_get_boot_config("slot", &slot)) {
		suffix = "_" + slot;
		} else if (!fs_mgr_get_boot_config("slot_suffix", &suffix)) {
		// remove slot_suffix once bootloaders update to new androidboot.slot param
		return -1;
		}
		if (ab_suffix.empty()) {
		ab_suffix = fs_mgr_get_slot_suffix();
		// Returns false as non A/B devices should not have MF_SLOTSELECT.
		if (ab_suffix.empty()) return false;
		}

		if (asprintf(&tmp, "%s%s", fstab->recs[n].blk_device, suffix.c_str()) > 0) {
		if (asprintf(&tmp, "%s%s", fstab->recs[n].blk_device, ab_suffix.c_str()) > 0) {
		free(fstab->recs[n].blk_device);
		fstab->recs[n].blk_device = tmp;
		} else {
		return -1;
		return false;
		}
		}
		}
		return 0;
		return true;
		}

fs_mgr/include/fs_mgr.h

+12 −4

Original line number	Diff line number	Diff line
		@@ -22,6 +22,12 @@
		#include <stdbool.h>
		#include <linux/dm-ioctl.h>

		// C++ only headers
		// TODO: move this into separate header files under include/fs_mgr/*.h
		#ifdef __cplusplus
		#include <string>
		#endif

		// Magic number at start of verity metadata
		#define VERITY_METADATA_MAGIC_NUMBER 0xb001b001

		@@ -29,9 +35,7 @@
		// turn verity off in userdebug builds.
		#define VERITY_METADATA_MAGIC_DISABLE 0x46464f56 // "VOFF"

		#ifdef __cplusplus
		extern "C" {
		#endif
		__BEGIN_DECLS

		// Verity modes
		enum verity_mode {
		@@ -142,8 +146,12 @@ int fs_mgr_do_format(struct fstab_rec *fstab, bool reserve_footer);
		#define FS_MGR_SETUP_VERITY_SUCCESS 0
		int fs_mgr_setup_verity(struct fstab_rec *fstab, bool wait_for_verity_dev);

		__END_DECLS

		// C++ only functions
		// TODO: move this into separate header files under include/fs_mgr/*.h
		#ifdef __cplusplus
		}
		std::string fs_mgr_get_slot_suffix();
		#endif

		#endif /* __CORE_FS_MGR_H */