/*
* journal.c --- code for handling the "ext3" journal
*
* Copyright (C) 2000 Andreas Dilger
* Copyright (C) 2000 Theodore Ts'o
*
* Parts of the code are based on fs/jfs/journal.c by Stephen C. Tweedie
* Copyright (C) 1999 Red Hat Software
*
* This file may be redistributed under the terms of the
* GNU General Public License version 2 or at your discretion
* any later version.
*/
#include "config.h"
#ifdef HAVE_SYS_MOUNT_H
#include <sys/param.h>
#include <sys/mount.h>
#define MNT_FL (MS_MGC_VAL | MS_RDONLY)
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#define E2FSCK_INCLUDE_INLINE_FUNCS
#include "jfs_user.h"
#include "problem.h"
#include "uuid/uuid.h"
#ifdef CONFIG_JBD_DEBUG /* Enabled by configure --enable-jfs-debug */
static int bh_count = 0;
#endif
/*
* Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths.
* This creates a larger static binary, and a smaller binary using
* shared libraries. It's also probably slightly less CPU-efficient,
* which is why it's not on by default. But, it's a good way of
* testing the functions in inode_io.c and fileio.c.
*/
#undef USE_INODE_IO
/* Checksumming functions */
static int e2fsck_journal_verify_csum_type(journal_t *j,
journal_superblock_t *jsb)
{
if (!journal_has_csum_v2or3(j))
return 1;
return jsb->s_checksum_type == JBD2_CRC32C_CHKSUM;
}
static __u32 e2fsck_journal_sb_csum(journal_superblock_t *jsb)
{
__u32 crc, old_crc;
old_crc = jsb->s_checksum;
jsb->s_checksum = 0;
crc = ext2fs_crc32c_le(~0, (unsigned char *)jsb,
sizeof(journal_superblock_t));
jsb->s_checksum = old_crc;
return crc;
}
static int e2fsck_journal_sb_csum_verify(journal_t *j,
journal_superblock_t *jsb)
{
__u32 provided, calculated;
if (!journal_has_csum_v2or3(j))
return 1;
provided = ext2fs_be32_to_cpu(jsb->s_checksum);
calculated = e2fsck_journal_sb_csum(jsb);
return provided == calculated;
}
static errcode_t e2fsck_journal_sb_csum_set(journal_t *j,
journal_superblock_t *jsb)
{
__u32 crc;
if (!journal_has_csum_v2or3(j))
return 0;
crc = e2fsck_journal_sb_csum(jsb);
jsb->s_checksum = ext2fs_cpu_to_be32(crc);
return 0;
}
/* Kernel compatibility functions for handling the journal. These allow us
* to use the recovery.c file virtually unchanged from the kernel, so we
* don't have to do much to keep kernel and user recovery in sync.
*/
int journal_bmap(journal_t *journal, blk64_t block, unsigned long long *phys)
{
#ifdef USE_INODE_IO
*phys = block;
return 0;
#else
struct inode *inode = journal->j_inode;
errcode_t retval;
blk64_t pblk;
if (!inode) {
*phys = block;
return 0;
}
retval= ext2fs_bmap2(inode->i_ctx->fs, inode->i_ino,
&inode->i_ext2, NULL, 0, block, 0, &pblk);
*phys = pblk;
return (int) retval;
#endif
}
struct buffer_head *getblk(kdev_t kdev, blk64_t blocknr, int blocksize)
{
struct buffer_head *bh;
int bufsize = sizeof(*bh) + kdev->k_ctx->fs->blocksize -
sizeof(bh->b_data);
bh = e2fsck_allocate_memory(kdev->k_ctx, bufsize, "block buffer");
if (!bh)
return NULL;
#ifdef CONFIG_JBD_DEBUG
if (journal_enable_debug >= 3)
bh_count++;
#endif
jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n",
(unsigned long long) blocknr, blocksize, bh_count);
bh->b_ctx = kdev->k_ctx;
if (kdev->k_dev == K_DEV_FS)
bh->b_io = kdev->k_ctx->fs->io;
else
bh->b_io = kdev->k_ctx->journal_io;
bh->b_size = blocksize;
bh->b_blocknr = blocknr;
return bh;
}
int sync_blockdev(kdev_t kdev)
{
io_channel io;
if (kdev->k_dev == K_DEV_FS)
io = kdev->k_ctx->fs->io;
else
io = kdev->k_ctx->journal_io;
return io_channel_flush(io) ? EIO : 0;
}
void ll_rw_block(int rw, int nr, struct buffer_head *bhp[])
{
errcode_t retval;
struct buffer_head *bh;
for (; nr > 0; --nr) {
bh = *bhp++;
if (rw == READ && !bh->b_uptodate) {
jfs_debug(3, "reading block %llu/%p\n",
bh->b_blocknr, (void *) bh);
retval = io_channel_read_blk64(bh->b_io,
bh->b_blocknr,
1, bh->b_data);
if (retval) {
com_err(bh->b_ctx->device_name, retval,
"while reading block %llu\n",
bh->b_blocknr);
bh->b_err = (int) retval;
continue;
}
bh->b_uptodate = 1;
} else if (rw == WRITE && bh->b_dirty) {
jfs_debug(3, "writing block %llu/%p\n",
bh->b_blocknr,
(void *) bh);
retval = io_channel_write_blk64(bh->b_io,
bh->b_blocknr,
1, bh->b_data);
if (retval) {
com_err(bh->b_ctx->device_name, retval,
"while writing block %llu\n",
bh->b_blocknr);
bh->b_err = (int) retval;
continue;
}
bh->b_dirty = 0;
bh->b_uptodate = 1;
} else {
jfs_debug(3, "no-op %s for block %llu\n",
rw == READ ? "read" : "write",
bh->b_blocknr);
}
}
}
void mark_buffer_dirty(struct buffer_head *bh)
{
bh->b_dirty = 1;
}
static void mark_buffer_clean(struct buffer_head * bh)
{
bh->b_dirty = 0;
}
void brelse(struct buffer_head *bh)
{
if (bh->b_dirty)
ll_rw_block(WRITE, 1, &bh);
jfs_debug(3, "freeing block %llu/%p (total %d)\n",
bh->b_blocknr, (void *) bh, --bh_count);
ext2fs_free_mem(&bh);
}
int buffer_uptodate(struct buffer_head *bh)
{
return bh->b_uptodate;
}
void mark_buffer_uptodate(struct buffer_head *bh, int val)
{
bh->b_uptodate = val;
}
void wait_on_buffer(struct buffer_head *bh)
{
if (!bh->b_uptodate)
ll_rw_block(READ, 1, &bh);
}
static void e2fsck_clear_recover(e2fsck_t ctx, int error)
{
ext2fs_clear_feature_journal_needs_recovery(ctx->fs->super);
/* if we had an error doing journal recovery, we need a full fsck */
if (error)
ctx->fs->super->s_state &= ~EXT2_VALID_FS;
ext2fs_mark_super_dirty(ctx->fs);
}
/*
* This is a helper function to check the validity of the journal.
*/
struct process_block_struct {
e2_blkcnt_t last_block;
};
static int process_journal_block(ext2_filsys fs,
blk64_t *block_nr,
e2_blkcnt_t blockcnt,
blk64_t ref_block EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data)
{
struct process_block_struct *p;
blk64_t blk = *block_nr;
p = (struct process_block_struct *) priv_data;
if (!blk || blk < fs->super->s_first_data_block ||
blk >= ext2fs_blocks_count(fs->super))
return BLOCK_ABORT;
if (blockcnt >= 0)
p->last_block = blockcnt;
return 0;
}
static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
{
struct process_block_struct pb;
struct ext2_super_block *sb = ctx->fs->super;
struct ext2_super_block jsuper;
struct problem_context pctx;
struct buffer_head *bh;
struct inode *j_inode = NULL;
struct kdev_s *dev_fs = NULL, *dev_journal;
const char *journal_name = 0;
journal_t *journal = NULL;
errcode_t retval = 0;
io_manager io_ptr = 0;
unsigned long long start = 0;
int ext_journal = 0;
int tried_backup_jnl = 0;
clear_problem_context(&pctx);
journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
if (!journal) {
return EXT2_ET_NO_MEMORY;
}
dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev");
if (!dev_fs) {
retval = EXT2_ET_NO_MEMORY;
goto errout;
}
dev_journal = dev_fs+1;
dev_fs->k_ctx = dev_journal->k_ctx = ctx;
dev_fs->k_dev = K_DEV_FS;
dev_journal->k_dev = K_DEV_JOURNAL;
journal->j_dev = dev_journal;
journal->j_fs_dev = dev_fs;
journal->j_inode = NULL;
journal->j_blocksize = ctx->fs->blocksize;
if (uuid_is_null(sb->s_journal_uuid)) {
if (!sb->s_journal_inum) {
retval = EXT2_ET_BAD_INODE_NUM;
goto errout;
}
j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode),
"journal inode");
if (!j_inode) {
retval = EXT2_ET_NO_MEMORY;
goto errout;
}
j_inode->i_ctx = ctx;
j_inode->i_ino = sb->s_journal_inum;
if ((retval = ext2fs_read_inode(ctx->fs,
sb->s_journal_inum,
&j_inode->i_ext2))) {
try_backup_journal:
if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
tried_backup_jnl)
goto errout;
memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks,
EXT2_N_BLOCKS*4);
j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15];
j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
j_inode->i_ext2.i_links_count = 1;
j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
e2fsck_use_inode_shortcuts(ctx, 1);
ctx->stashed_ino = j_inode->i_ino;
ctx->stashed_inode = &j_inode->i_ext2;
tried_backup_jnl++;
}
if (!j_inode->i_ext2.i_links_count ||
!LINUX_S_ISREG(j_inode->i_ext2.i_mode)) {
retval = EXT2_ET_NO_JOURNAL;
goto try_backup_journal;
}
if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize <
JFS_MIN_JOURNAL_BLOCKS) {
retval = EXT2_ET_JOURNAL_TOO_SMALL;
goto try_backup_journal;
}
pb.last_block = -1;
retval = ext2fs_block_iterate3(ctx->fs, j_inode->i_ino,
BLOCK_FLAG_HOLE, 0,
process_journal_block, &pb);
if ((pb.last_block + 1) * ctx->fs->blocksize <
(int) EXT2_I_SIZE(&j_inode->i_ext2)) {
retval = EXT2_ET_JOURNAL_TOO_SMALL;
goto try_backup_journal;
}
if (tried_backup_jnl && !(ctx->options & E2F_OPT_READONLY)) {
retval = ext2fs_write_inode(ctx->fs, sb->s_journal_inum,
&j_inode->i_ext2);
if (retval)
goto errout;
}
journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) /
journal->j_blocksize;
#ifdef USE_INODE_IO
retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum,
&j_inode->i_ext2,
&journal_name);
if (retval)
goto errout;
io_ptr = inode_io_manager;
#else
journal->j_inode = j_inode;
ctx->journal_io = ctx->fs->io;
if ((retval = (errcode_t) journal_bmap(journal, 0, &start)) != 0)
goto errout;
#endif
} else {
ext_journal = 1;
if (!ctx->journal_name) {
char uuid[37];
uuid_unparse(sb->s_journal_uuid, uuid);
ctx->journal_name = blkid_get_devname(ctx->blkid,
"UUID", uuid);
if (!ctx->journal_name)
ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
}
journal_name = ctx->journal_name;
if (!journal_name) {
fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx);
retval = EXT2_ET_LOAD_EXT_JOURNAL;
goto errout;
}
jfs_debug(1, "Using journal file %s\n", journal_name);
io_ptr = unix_io_manager;
}
#if 0
test_io_backing_manager = io_ptr;
io_ptr = test_io_manager;
#endif
#ifndef USE_INODE_IO
if (ext_journal)
#endif
{
int flags = IO_FLAG_RW;
if (!(ctx->mount_flags & EXT2_MF_ISROOT &&
ctx->mount_flags & EXT2_MF_READONLY))
flags |= IO_FLAG_EXCLUSIVE;
if ((ctx->mount_flags & EXT2_MF_READONLY) &&
(ctx->options & E2F_OPT_FORCE))
flags &= ~IO_FLAG_EXCLUSIVE;
retval = io_ptr->open(journal_name, flags,
&ctx->journal_io);
}
if (retval)
goto errout;
io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize);
if (ext_journal) {
blk64_t maxlen;
start = ext2fs_journal_sb_start(ctx->fs->blocksize) - 1;
bh = getblk(dev_journal, start, ctx->fs->blocksize);
if (!bh) {
retval = EXT2_ET_NO_MEMORY;
goto errout;
}
ll_rw_block(READ, 1, &bh);
if ((retval = bh->b_err) != 0) {
brelse(bh);
goto errout;
}
memcpy(&jsuper, start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET,
sizeof(jsuper));
#ifdef WORDS_BIGENDIAN
if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
ext2fs_swap_super(&jsuper);
#endif
if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
!ext2fs_has_feature_journal_dev(&jsuper)) {
fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx);
retval = EXT2_ET_LOAD_EXT_JOURNAL;
brelse(bh);
goto errout;
}
/* Make sure the journal UUID is correct */
if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid,
sizeof(jsuper.s_uuid))) {
fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx);
retval = EXT2_ET_LOAD_EXT_JOURNAL;
brelse(bh);
goto errout;
}
/* Check the superblock checksum */
if (ext2fs_has_feature_metadata_csum(&jsuper)) {
struct struct_ext2_filsys fsx;
struct ext2_super_block superx;
void *p;
p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET;
memcpy(&fsx, ctx->fs, sizeof(fsx));
memcpy(&superx, ctx->fs->super, sizeof(superx));
fsx.super = &superx;
ext2fs_set_feature_metadata_csum(fsx.super);
if (!ext2fs_superblock_csum_verify(&fsx, p) &&
fix_problem(ctx, PR_0_EXT_JOURNAL_SUPER_CSUM_INVALID,
&pctx)) {
ext2fs_superblock_csum_set(&fsx, p);
mark_buffer_dirty(bh);
}
}
brelse(bh);
maxlen = ext2fs_blocks_count(&jsuper);
journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen : (1ULL << 32) - 1;
start++;
}
if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) {
retval = EXT2_ET_NO_MEMORY;
goto errout;
}
journal->j_sb_buffer = bh;
journal->j_superblock = (journal_superblock_t *)bh->b_data;
#ifdef USE_INODE_IO
if (j_inode)
ext2fs_free_mem(&j_inode);
#endif
*ret_journal = journal;
e2fsck_use_inode_shortcuts(ctx, 0);
return 0;
errout:
e2fsck_use_inode_shortcuts(ctx, 0);
if (dev_fs)
ext2fs_free_mem(&dev_fs);
if (j_inode)
ext2fs_free_mem(&j_inode);
if (journal)
ext2fs_free_mem(&journal);
return retval;
}
static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
struct problem_context *pctx)
{
struct ext2_super_block *sb = ctx->fs->super;
int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
int has_journal = ext2fs_has_feature_journal(ctx->fs->super);
if (has_journal || sb->s_journal_inum) {
/* The journal inode is bogus, remove and force full fsck */
pctx->ino = sb->s_journal_inum;
if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
if (has_journal && sb->s_journal_inum)
printf("*** journal has been deleted ***\n\n");
ext2fs_clear_feature_journal(sb);
sb->s_journal_inum = 0;
memset(sb->s_jnl_blocks, 0, sizeof(sb->s_jnl_blocks));
ctx->flags |= E2F_FLAG_JOURNAL_INODE;
ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
e2fsck_clear_recover(ctx, 1);
return 0;
}
return EXT2_ET_CORRUPT_JOURNAL_SB;
} else if (recover) {
if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
e2fsck_clear_recover(ctx, 1);
return 0;
}
return EXT2_ET_UNSUPP_FEATURE;
}
return 0;
}
#define V1_SB_SIZE 0x0024
static void clear_v2_journal_fields(journal_t *journal)
{
e2fsck_t ctx = journal->j_dev->k_ctx;
struct problem_context pctx;
clear_problem_context(&pctx);
if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx))
return;
ctx->flags |= E2F_FLAG_PROBLEMS_FIXED;
memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0,
ctx->fs->blocksize-V1_SB_SIZE);
mark_buffer_dirty(journal->j_sb_buffer);
}
static errcode_t e2fsck_journal_load(journal_t *journal)
{
e2fsck_t ctx = journal->j_dev->k_ctx;
journal_superblock_t *jsb;
struct buffer_head *jbh = journal->j_sb_buffer;
struct problem_context pctx;
clear_problem_context(&pctx);
ll_rw_block(READ, 1, &jbh);
if (jbh->b_err) {
com_err(ctx->device_name, jbh->b_err, "%s",
_("reading journal superblock\n"));
return jbh->b_err;
}
jsb = journal->j_superblock;
/* If we don't even have JFS_MAGIC, we probably have a wrong inode */
if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
return e2fsck_journal_fix_bad_inode(ctx, &pctx);
switch (ntohl(jsb->s_header.h_blocktype)) {
case JFS_SUPERBLOCK_V1:
journal->j_format_version = 1;
if (jsb->s_feature_compat ||
jsb->s_feature_incompat ||
jsb->s_feature_ro_compat ||
jsb->s_nr_users)
clear_v2_journal_fields(journal);
break;
case JFS_SUPERBLOCK_V2:
journal->j_format_version = 2;
if (ntohl(jsb->s_nr_users) > 1 &&
uuid_is_null(ctx->fs->super->s_journal_uuid))
clear_v2_journal_fields(journal);
if (ntohl(jsb->s_nr_users) > 1) {
fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx);
return EXT2_ET_JOURNAL_UNSUPP_VERSION;
}
break;
/*
* These should never appear in a journal super block, so if
* they do, the journal is badly corrupted.
*/
case JFS_DESCRIPTOR_BLOCK:
case JFS_COMMIT_BLOCK:
case JFS_REVOKE_BLOCK:
return EXT2_ET_CORRUPT_JOURNAL_SB;
/* If we don't understand the superblock major type, but there
* is a magic number, then it is likely to be a new format we
* just don't understand, so leave it alone. */
default:
return EXT2_ET_JOURNAL_UNSUPP_VERSION;
}
if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES))
return EXT2_ET_UNSUPP_FEATURE;
if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES))
return EXT2_ET_RO_UNSUPP_FEATURE;
/* Checksum v1-3 are mutually exclusive features. */
if (jfs_has_feature_csum2(journal) && jfs_has_feature_csum3(journal))
return EXT2_ET_CORRUPT_JOURNAL_SB;
if (journal_has_csum_v2or3(journal) &&
jfs_has_feature_checksum(journal))
return EXT2_ET_CORRUPT_JOURNAL_SB;
if (!e2fsck_journal_verify_csum_type(journal, jsb) ||
!e2fsck_journal_sb_csum_verify(journal, jsb))
return EXT2_ET_CORRUPT_JOURNAL_SB;
if (journal_has_csum_v2or3(journal))
journal->j_csum_seed = jbd2_chksum(journal, ~0, jsb->s_uuid,
sizeof(jsb->s_uuid));
/* We have now checked whether we know enough about the journal
* format to be able to proceed safely, so any other checks that
* fail we should attempt to recover from. */
if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
com_err(ctx->program_name, EXT2_ET_CORRUPT_JOURNAL_SB,
_("%s: no valid journal superblock found\n"),
ctx->device_name);
return EXT2_ET_CORRUPT_JOURNAL_SB;
}
if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
journal->j_maxlen = ntohl(jsb->s_maxlen);
else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) {
com_err(ctx->program_name, EXT2_ET_CORRUPT_JOURNAL_SB,
_("%s: journal too short\n"),
ctx->device_name);
return EXT2_ET_CORRUPT_JOURNAL_SB;
}
journal->j_tail_sequence = ntohl(jsb->s_sequence);
journal->j_transaction_sequence = journal->j_tail_sequence;
journal->j_tail = ntohl(jsb->s_start);
journal->j_first = ntohl(jsb->s_first);
journal->j_last = ntohl(jsb->s_maxlen);
return 0;
}
static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
journal_t *journal)
{
char *p;
union {
uuid_t uuid;
__u32 val[4];
} u;
__u32 new_seq = 0;
int i;
/* Leave a valid existing V1 superblock signature alone.
* Anything unrecognisable we overwrite with a new V2
* signature. */
if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) ||
jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) {
jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
}
/* Zero out everything else beyond the superblock header */
p = ((char *) jsb) + sizeof(journal_header_t);
memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));
jsb->s_blocksize = htonl(ctx->fs->blocksize);
jsb->s_maxlen = htonl(journal->j_maxlen);
jsb->s_first = htonl(1);
/* Initialize the journal sequence number so that there is "no"
* chance we will find old "valid" transactions in the journal.
* This avoids the need to zero the whole journal (slow to do,
* and risky when we are just recovering the filesystem).
*/
uuid_generate(u.uuid);
for (i = 0; i < 4; i ++)
new_seq ^= u.val[i];
jsb->s_sequence = htonl(new_seq);
e2fsck_journal_sb_csum_set(journal, jsb);
mark_buffer_dirty(journal->j_sb_buffer);
ll_rw_block(WRITE, 1, &journal->j_sb_buffer);
}
static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,
journal_t *journal,
struct problem_context *pctx)
{
struct ext2_super_block *sb = ctx->fs->super;
int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
if (ext2fs_has_feature_journal(sb)) {
if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
e2fsck_journal_reset_super(ctx, journal->j_superblock,
journal);
journal->j_transaction_sequence = 1;
e2fsck_clear_recover(ctx, recover);
return 0;
}
return EXT2_ET_CORRUPT_JOURNAL_SB;
} else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
return EXT2_ET_CORRUPT_JOURNAL_SB;
return 0;
}
static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal,
int reset, int drop)
{
journal_superblock_t *jsb;
if (drop)
mark_buffer_clean(journal->j_sb_buffer);
else if (!(ctx->options & E2F_OPT_READONLY)) {
jsb = journal->j_superblock;
jsb->s_sequence = htonl(journal->j_tail_sequence);
if (reset)
jsb->s_start = 0; /* this marks the journal as empty */
e2fsck_journal_sb_csum_set(journal, jsb);
mark_buffer_dirty(journal->j_sb_buffer);
}
brelse(journal->j_sb_buffer);
if (ctx->journal_io) {
if (ctx->fs && ctx->fs->io != ctx->journal_io)
io_channel_close(ctx->journal_io);
ctx->journal_io = 0;
}
#ifndef USE_INODE_IO
if (journal->j_inode)
ext2fs_free_mem(&journal->j_inode);
#endif
if (journal->j_fs_dev)
ext2fs_free_mem(&journal->j_fs_dev);
ext2fs_free_mem(&journal);
}
/*
* This function makes sure that the superblock fields regarding the
* journal are consistent.
*/
errcode_t e2fsck_check_ext3_journal(e2fsck_t ctx)
{
struct ext2_super_block *sb = ctx->fs->super;
journal_t *journal;
int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
struct problem_context pctx;
problem_t problem;
int reset = 0, force_fsck = 0;
errcode_t retval;
/* If we don't have any journal features, don't do anything more */
if (!ext2fs_has_feature_journal(sb) &&
!recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
uuid_is_null(sb->s_journal_uuid))
return 0;
clear_problem_context(&pctx);
pctx.num = sb->s_journal_inum;
retval = e2fsck_get_journal(ctx, &journal);
if (retval) {
if ((retval == EXT2_ET_BAD_INODE_NUM) ||
(retval == EXT2_ET_BAD_BLOCK_NUM) ||
(retval == EXT2_ET_JOURNAL_TOO_SMALL) ||
(retval == EXT2_ET_NO_JOURNAL))
return e2fsck_journal_fix_bad_inode(ctx, &pctx);
return retval;
}
retval = e2fsck_journal_load(journal);
if (retval) {
if ((retval == EXT2_ET_CORRUPT_JOURNAL_SB) ||
((retval == EXT2_ET_UNSUPP_FEATURE) &&
(!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT,
&pctx))) ||
((retval == EXT2_ET_RO_UNSUPP_FEATURE) &&
(!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT,
&pctx))) ||
((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) &&
(!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx))))
retval = e2fsck_journal_fix_corrupt_super(ctx, journal,
&pctx);
e2fsck_journal_release(ctx, journal, 0, 1);
return retval;
}
/*
* We want to make the flags consistent here. We will not leave with
* needs_recovery set but has_journal clear. We can't get in a loop
* with -y, -n, or -p, only if a user isn't making up their mind.
*/
no_has_journal:
if (!ext2fs_has_feature_journal(sb)) {
recover = ext2fs_has_feature_journal_needs_recovery(sb);
if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
if (recover &&
!fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
goto no_has_journal;
/*
* Need a full fsck if we are releasing a
* journal stored on a reserved inode.
*/
force_fsck = recover ||
(sb->s_journal_inum < EXT2_FIRST_INODE(sb));
/* Clear all of the journal fields */
sb->s_journal_inum = 0;
sb->s_journal_dev = 0;
memset(sb->s_journal_uuid, 0,
sizeof(sb->s_journal_uuid));
e2fsck_clear_recover(ctx, force_fsck);
} else if (!(ctx->options & E2F_OPT_READONLY)) {
ext2fs_set_feature_journal(sb);
ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
ext2fs_mark_super_dirty(ctx->fs);
}
}
if (ext2fs_has_feature_journal(sb) &&
!ext2fs_has_feature_journal_needs_recovery(sb) &&
journal->j_superblock->s_start != 0) {
/* Print status information */
fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx);
if (ctx->superblock)
problem = PR_0_JOURNAL_RUN_DEFAULT;
else
problem = PR_0_JOURNAL_RUN;
if (fix_problem(ctx, problem, &pctx)) {
ctx->options |= E2F_OPT_FORCE;
ext2fs_set_feature_journal_needs_recovery(sb);
ext2fs_mark_super_dirty(ctx->fs);
} else if (fix_problem(ctx,
PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
reset = 1;
sb->s_state &= ~EXT2_VALID_FS;
ext2fs_mark_super_dirty(ctx->fs);
}
/*
* If the user answers no to the above question, we
* ignore the fact that journal apparently has data;
* accidentally replaying over valid data would be far
* worse than skipping a questionable recovery.
*
* XXX should we abort with a fatal error here? What
* will the ext3 kernel code do if a filesystem with
* !NEEDS_RECOVERY but with a non-zero
* journal->j_superblock->s_start is mounted?
*/
}
/*
* If we don't need to do replay the journal, check to see if
* the journal's errno is set; if so, we need to mark the file
* system as being corrupt and clear the journal's s_errno.
*/
if (!ext2fs_has_feature_journal_needs_recovery(sb) &&
journal->j_superblock->s_errno) {
ctx->fs->super->s_state |= EXT2_ERROR_FS;
ext2fs_mark_super_dirty(ctx->fs);
journal->j_superblock->s_errno = 0;
e2fsck_journal_sb_csum_set(journal, journal->j_superblock);
mark_buffer_dirty(journal->j_sb_buffer);
}
e2fsck_journal_release(ctx, journal, reset, 0);
return retval;
}
static errcode_t recover_ext3_journal(e2fsck_t ctx)
{
struct problem_context pctx;
journal_t *journal;
errcode_t retval;
clear_problem_context(&pctx);
journal_init_revoke_caches();
retval = e2fsck_get_journal(ctx, &journal);
if (retval)
return retval;
retval = e2fsck_journal_load(journal);
if (retval)
goto errout;
retval = journal_init_revoke(journal, 1024);
if (retval)
goto errout;
retval = -journal_recover(journal);
if (retval)
goto errout;
if (journal->j_failed_commit) {
pctx.ino = journal->j_failed_commit;
fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx);
journal->j_superblock->s_errno = -EINVAL;
mark_buffer_dirty(journal->j_sb_buffer);
}
journal->j_tail_sequence = journal->j_transaction_sequence;
errout:
journal_destroy_revoke(journal);
journal_destroy_revoke_caches();
e2fsck_journal_release(ctx, journal, 1, 0);
return retval;
}
errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx)
{
io_manager io_ptr = ctx->fs->io->manager;
int blocksize = ctx->fs->blocksize;
errcode_t retval, recover_retval;
io_stats stats = 0;
unsigned long long kbytes_written = 0;
printf(_("%s: recovering journal\n"), ctx->device_name);
if (ctx->options & E2F_OPT_READONLY) {
printf(_("%s: won't do journal recovery while read-only\n"),
ctx->device_name);
return EXT2_ET_FILE_RO;
}
if (ctx->fs->flags & EXT2_FLAG_DIRTY)
ext2fs_flush(ctx->fs); /* Force out any modifications */
recover_retval = recover_ext3_journal(ctx);
/*
* Reload the filesystem context to get up-to-date data from disk
* because journal recovery will change the filesystem under us.
*/
if (ctx->fs->super->s_kbytes_written &&
ctx->fs->io->manager->get_stats)
ctx->fs->io->manager->get_stats(ctx->fs->io, &stats);
if (stats && stats->bytes_written)
kbytes_written = stats->bytes_written >> 10;
ext2fs_mmp_stop(ctx->fs);
ext2fs_free(ctx->fs);
retval = ext2fs_open(ctx->filesystem_name, ctx->openfs_flags,
ctx->superblock, blocksize, io_ptr,
&ctx->fs);
if (retval) {
com_err(ctx->program_name, retval,
_("while trying to re-open %s"),
ctx->device_name);
fatal_error(ctx, 0);
}
ctx->fs->priv_data = ctx;
ctx->fs->now = ctx->now;
ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
ctx->fs->super->s_kbytes_written += kbytes_written;
/* Set the superblock flags */
e2fsck_clear_recover(ctx, recover_retval != 0);
/*
* Do one last sanity check, and propagate journal->s_errno to
* the EXT2_ERROR_FS flag in the fs superblock if needed.
*/
retval = e2fsck_check_ext3_journal(ctx);
return retval ? retval : recover_retval;
}
/*
* This function will move the journal inode from a visible file in
* the filesystem directory hierarchy to the reserved inode if necessary.
*/
static const char * const journal_names[] = {
".journal", "journal", ".journal.dat", "journal.dat", 0 };
void e2fsck_move_ext3_journal(e2fsck_t ctx)
{
struct ext2_super_block *sb = ctx->fs->super;
struct problem_context pctx;
struct ext2_inode inode;
ext2_filsys fs = ctx->fs;
ext2_ino_t ino;
errcode_t retval;
const char * const * cpp;
dgrp_t group;
int mount_flags;
clear_problem_context(&pctx);
/*
* If the filesystem is opened read-only, or there is no
* journal, then do nothing.
*/
if ((ctx->options & E2F_OPT_READONLY) ||
(sb->s_journal_inum == 0) ||
!ext2fs_has_feature_journal(sb))
return;
/*
* Read in the journal inode
*/
if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0)
return;
/*
* If it's necessary to backup the journal inode, do so.
*/
if ((sb->s_jnl_backup_type == 0) ||
((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) &&
memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) {
if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) {
memcpy(sb->s_jnl_blocks, inode.i_block,
EXT2_N_BLOCKS*4);
sb->s_jnl_blocks[15] = inode.i_size_high;
sb->s_jnl_blocks[16] = inode.i_size;
sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
ext2fs_mark_super_dirty(fs);
fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
}
}
/*
* If the journal is already the hidden inode, then do nothing
*/
if (sb->s_journal_inum == EXT2_JOURNAL_INO)
return;
/*
* The journal inode had better have only one link and not be readable.
*/
if (inode.i_links_count != 1)
return;
/*
* If the filesystem is mounted, or we can't tell whether
* or not it's mounted, do nothing.
*/
retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags);
if (retval || (mount_flags & EXT2_MF_MOUNTED))
return;
/*
* If we can't find the name of the journal inode, then do
* nothing.
*/
for (cpp = journal_names; *cpp; cpp++) {
retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp,
strlen(*cpp), 0, &ino);
if ((retval == 0) && (ino == sb->s_journal_inum))
break;
}
if (*cpp == 0)
return;
/* We need the inode bitmap to be loaded */
retval = ext2fs_read_bitmaps(fs);
if (retval)
return;
pctx.str = *cpp;
if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx))
return;
/*
* OK, we've done all the checks, let's actually move the
* journal inode. Errors at this point mean we need to force
* an ext2 filesystem check.
*/
if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0)
goto err_out;
if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0)
goto err_out;
sb->s_journal_inum = EXT2_JOURNAL_INO;
ext2fs_mark_super_dirty(fs);
fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
inode.i_links_count = 0;
inode.i_dtime = ctx->now;
if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0)
goto err_out;
group = ext2fs_group_of_ino(fs, ino);
ext2fs_unmark_inode_bitmap2(fs->inode_map, ino);
ext2fs_mark_ib_dirty(fs);
ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) + 1);
ext2fs_group_desc_csum_set(fs, group);
fs->super->s_free_inodes_count++;
return;
err_out:
pctx.errcode = retval;
fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx);
fs->super->s_state &= ~EXT2_VALID_FS;
ext2fs_mark_super_dirty(fs);
return;
}
/*
* This function makes sure the superblock hint for the external
* journal is correct.
*/
int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx)
{
struct ext2_super_block *sb = ctx->fs->super;
struct problem_context pctx;
char uuid[37], *journal_name;
struct stat st;
if (!ext2fs_has_feature_journal(sb) ||
uuid_is_null(sb->s_journal_uuid))
return 0;
uuid_unparse(sb->s_journal_uuid, uuid);
journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid);
if (!journal_name)
return 0;
if (stat(journal_name, &st) < 0) {
free(journal_name);
return 0;
}
if (st.st_rdev != sb->s_journal_dev) {
clear_problem_context(&pctx);
pctx.num = st.st_rdev;
if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) {
sb->s_journal_dev = st.st_rdev;
ext2fs_mark_super_dirty(ctx->fs);
}
}
free(journal_name);
return 0;
}