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check ext4 magic before running next steps 

- mount, e2fsck, tune2fs will all fail if magic number does not match.
- mismatch always happen for FDE and is wasting boot-up time to try
  all and fail always.
- skip mount steps if it has invalid magic number and do not record
  fs_stat either.
- For ext4 fs with corrupt superblock, e2fsck refuses to do anything if
  superblock magic is invalid. So simply running e2fsck does not help
  anyway.

bug: 36231950
Test: reboot ane check fs_mgr log from dmesg

(cherry picked from commit 6000a3f657)

Change-Id: Ia7120a188c316262da5fdb986c7d9c76db86aa7b
This commit is contained in:
Keun-young Park 2017-04-11 18:59:56 -07:00
parent fb803d50d0
commit 835239a2c2
1 changed files with 25 additions and 9 deletions
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34
fs_mgr/fs_mgr.cpp
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@ -44,6 +44,7 @@
#include <ext4_utils/wipe.h>
#include <linux/fs.h>
#include <linux/loop.h>
#include <linux/magic.h>
#include <logwrap/logwrap.h>
#include <private/android_logger.h> // for __android_log_is_debuggable()
@ -67,17 +68,18 @@
// record fs stat
enum FsStatFlags {
FS_STAT_IS_EXT4 = 0x0001,
FS_STAT_IS_EXT4 = 0x0001,
FS_STAT_NEW_IMAGE_VERSION = 0x0002,
FS_STAT_E2FSCK_F_ALWAYS = 0x0004,
FS_STAT_UNCLEAN_SHUTDOWN = 0x0008,
FS_STAT_QUOTA_ENABLED = 0x0010,
FS_STAT_TUNE2FS_FAILED = 0x0020,
FS_STAT_RO_MOUNT_FAILED = 0x0040,
FS_STAT_E2FSCK_F_ALWAYS = 0x0004,
FS_STAT_UNCLEAN_SHUTDOWN = 0x0008,
FS_STAT_QUOTA_ENABLED = 0x0010,
FS_STAT_TUNE2FS_FAILED = 0x0020,
FS_STAT_RO_MOUNT_FAILED = 0x0040,
FS_STAT_RO_UNMOUNT_FAILED = 0x0080,
FS_STAT_FULL_MOUNT_FAILED = 0x0100,
FS_STAT_E2FSCK_FAILED = 0x0200,
FS_STAT_E2FSCK_FS_FIXED = 0x0400,
FS_STAT_E2FSCK_FAILED = 0x0200,
FS_STAT_E2FSCK_FS_FIXED = 0x0400,
FS_STAT_EXT4_INVALID_MAGIC = 0x0800,
};
/*
@ -136,6 +138,9 @@ static void check_fs(const char *blk_device, char *fs_type, char *target, int *f
/* Check for the types of filesystems we know how to check */
if (!strcmp(fs_type, "ext2") || !strcmp(fs_type, "ext3") || !strcmp(fs_type, "ext4")) {
if (*fs_stat & FS_STAT_EXT4_INVALID_MAGIC) { // will fail, so do not try
return;
}
/*
* First try to mount and unmount the filesystem. We do this because
* the kernel is more efficient than e2fsck in running the journal and
@ -282,6 +287,11 @@ static int do_quota_with_shutdown_check(char *blk_device, char *fs_type,
PERROR << "Can't read '" << blk_device << "' super block";
return force_check;
}
if (sb.s_magic != EXT4_SUPER_MAGIC) {
LINFO << "Invalid ext4 magic:0x" << std::hex << sb.s_magic << "," << blk_device;
*fs_stat |= FS_STAT_EXT4_INVALID_MAGIC;
return 0; // not a valid fs, tune2fs, fsck, and mount will all fail.
}
*fs_stat |= FS_STAT_IS_EXT4;
LINFO << "superblock s_max_mnt_count:" << sb.s_max_mnt_count << "," << blk_device;
if (sb.s_max_mnt_count == 0xffff) { // -1 (int16) in ext2, but uint16 in ext4
@ -542,7 +552,13 @@ static int mount_with_alternatives(struct fstab *fstab, int start_idx, int *end_
int force_check = do_quota_with_shutdown_check(fstab->recs[i].blk_device,
fstab->recs[i].fs_type,
&fstab->recs[i], &fs_stat);
if (fs_stat & FS_STAT_EXT4_INVALID_MAGIC) {
LERROR << __FUNCTION__ << "(): skipping mount, invalid ext4, mountpoint="
<< fstab->recs[i].mount_point << " rec[" << i
<< "].fs_type=" << fstab->recs[i].fs_type;
mount_errno = EINVAL; // continue bootup for FDE
continue;
}
if ((fstab->recs[i].fs_mgr_flags & MF_CHECK) || force_check) {
check_fs(fstab->recs[i].blk_device, fstab->recs[i].fs_type,
fstab->recs[i].mount_point, &fs_stat);