/**
* journal_t * journal_init_inode () - creates a journal which maps to a inode.
* @inode: An inode to create the journal in
*
* journal_init_inode creates a journal which maps an on-disk inode as
* the journal. The inode must exist already, must support bmap() and
* must have all data blocks preallocated.
*/
journal_t * journal_init_inode (struct inode *inode)
{
struct buffer_head *bh;
journal_t *journal = journal_init_common();
int err;
int n;
unsigned long blocknr;
if (!journal)
return NULL;
journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev;
journal->j_inode = inode;
jbd_debug(1,
"journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n",
journal, inode->i_sb->s_id, inode->i_ino,
(s64) inode->i_size,
inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize);
journal->j_maxlen = (unsigned int)(inode->i_size >> inode->i_sb->s_blocksize_bits);
journal->j_blocksize = inode->i_sb->s_blocksize;
/* journal descriptor can store up to n blocks -bzzz */
n = journal->j_blocksize / sizeof(journal_block_tag_t);
journal->j_wbufsize = n;
journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL);
if (!journal->j_wbuf) {
printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n",
__FUNCTION__);
J_ASSERT(journal->j_revoke != NULL);
if (journal->j_revoke)
journal_destroy_revoke(journal);
kfree(journal);
return NULL;
}
err = journal_bmap(journal, 0, &blocknr);
/* If that failed, give up */
if (err) {
printk(KERN_ERR "%s: Cannnot locate journal superblock\n",
__FUNCTION__);
J_ASSERT(journal->j_revoke != NULL);
if (journal->j_revoke)
journal_destroy_revoke(journal);
J_ASSERT(journal->j_wbuf != NULL);
kfree(journal->j_wbuf);
kfree(journal);
return NULL;
}
bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
J_ASSERT(bh != NULL);
journal->j_sb_buffer = bh;
journal->j_superblock = (journal_superblock_t *)bh->b_data;
return journal;
}
static int do_readahead(journal_t *journal, unsigned int start)
{
int err;
unsigned int max, nbufs, next;
unsigned long blocknr;
struct buffer_head *bh;
struct buffer_head * bufs[MAXBUF];
/* Do up to 128K of readahead */
max = start + (128 * 1024 / journal->j_blocksize);
if (max > journal->j_maxlen)
max = journal->j_maxlen;
/* Do the readahead itself. We'll submit MAXBUF buffer_heads at
* a time to the block device IO layer. */
nbufs = 0;
for (next = start; next < max; next++) {
err = journal_bmap(journal, next, &blocknr);
if (err) {
printk (KERN_ERR "JBD: bad block at offset %u\n",
next);
goto failed;
}
bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
if (!bh) {
err = -ENOMEM;
goto failed;
}
if (!buffer_uptodate(bh) && !buffer_locked(bh)) {
bufs[nbufs++] = bh;
if (nbufs == MAXBUF) {
ll_rw_block(READ, nbufs, bufs);
journal_brelse_array(bufs, nbufs);
nbufs = 0;
}
} else
brelse(bh);
}
if (nbufs)
ll_rw_block(READ, nbufs, bufs);
err = 0;
failed:
if (nbufs)
journal_brelse_array(bufs, nbufs);
return err;
}
int journal_next_log_block(journal_t *journal, unsigned long *retp)
{
unsigned long blocknr;
jbd_lock(&journal->j_state_lock);
J_ASSERT(journal->j_free > 1);
blocknr = journal->j_head;
journal->j_head++;
journal->j_free--;
if (journal->j_head == journal->j_last)
journal->j_head = journal->j_first;
jbd_unlock(&journal->j_state_lock);
return journal_bmap(journal, blocknr, retp);
}
static int jread(struct buffer_head **bhp, journal_t *journal,
unsigned int offset)
{
int err;
unsigned long blocknr;
struct buffer_head *bh;
*bhp = NULL;
if (offset >= journal->j_maxlen) {
printk(KERN_ERR "JBD: corrupted journal superblock\n");
return -EIO;
}
err = journal_bmap(journal, offset, &blocknr);
if (err) {
printk (KERN_ERR "JBD: bad block at offset %u\n",
offset);
return err;
}
bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
if (!bh)
return -ENOMEM;
if (!buffer_uptodate(bh)) {
/* If this is a brand new buffer, start readahead.
Otherwise, we assume we are already reading it. */
if (!buffer_req(bh))
do_readahead(journal, offset);
wait_on_buffer(bh);
}
if (!buffer_uptodate(bh)) {
printk (KERN_ERR "JBD: Failed to read block at offset %u\n",
offset);
brelse(bh);
return -EIO;
}
*bhp = bh;
return 0;
}
static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
{
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 start = 0;
blk_t blk;
int ext_journal = 0;
int tried_backup_jnl = 0;
int i;
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)
return EXT2_ET_BAD_INODE_NUM;
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 = sb->s_jnl_blocks[16];
j_inode->i_ext2.i_links_count = 1;
j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
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 (j_inode->i_ext2.i_size / journal->j_blocksize <
JFS_MIN_JOURNAL_BLOCKS) {
retval = EXT2_ET_JOURNAL_TOO_SMALL;
goto try_backup_journal;
}
for (i=0; i < EXT2_N_BLOCKS; i++) {
blk = j_inode->i_ext2.i_block[i];
if (!blk) {
if (i < EXT2_NDIR_BLOCKS) {
retval = EXT2_ET_JOURNAL_TOO_SMALL;
goto try_backup_journal;
}
continue;
}
if (blk < sb->s_first_data_block ||
blk >= sb->s_blocks_count) {
retval = EXT2_ET_BAD_BLOCK_NUM;
goto try_backup_journal;
}
}
journal->j_maxlen = j_inode->i_ext2.i_size / 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 = 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);
return EXT2_ET_LOAD_EXT_JOURNAL;
}
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
retval = io_ptr->open(journal_name, IO_FLAG_RW,
&ctx->journal_io);
if (retval)
goto errout;
io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize);
if (ext_journal) {
if (ctx->fs->blocksize == 1024)
start = 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 + 1024,
sizeof(jsuper));
brelse(bh);
#ifdef EXT2FS_ENABLE_SWAPFS
if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
ext2fs_swap_super(&jsuper);
#endif
if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
!(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx);
retval = EXT2_ET_LOAD_EXT_JOURNAL;
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;
goto errout;
}
journal->j_maxlen = jsuper.s_blocks_count;
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;
return 0;
errout:
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_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 ||
!(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
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 (jsuper.s_feature_ro_compat &
EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) {
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;
fsx.super->s_feature_ro_compat |=
EXT4_FEATURE_RO_COMPAT_METADATA_CSUM;
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 ext2fs_get_journal(ext2_filsys fs, journal_t **ret_journal)
{
struct process_block_struct pb;
struct ext2_super_block *sb = fs->super;
struct ext2_super_block jsuper;
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;
retval = ext2fs_get_memzero(sizeof(journal_t), &journal);
if (retval)
return retval;
retval = ext2fs_get_memzero(2 * sizeof(struct kdev_s), &dev_fs);
if (retval)
goto errout;
dev_journal = dev_fs+1;
dev_fs->k_fs = dev_journal->k_fs = fs;
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 = fs->blocksize;
if (uuid_is_null(sb->s_journal_uuid)) {
if (!sb->s_journal_inum) {
retval = EXT2_ET_BAD_INODE_NUM;
goto errout;
}
retval = ext2fs_get_memzero(sizeof(*j_inode), &j_inode);
if (retval)
goto errout;
j_inode->i_fs = fs;
j_inode->i_ino = sb->s_journal_inum;
retval = ext2fs_read_inode(fs, sb->s_journal_inum,
&j_inode->i_ext2);
if (retval) {
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;
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(fs, j_inode->i_ino,
BLOCK_FLAG_HOLE, 0,
process_journal_block, &pb);
if ((pb.last_block + 1) * fs->blocksize <
(int) EXT2_I_SIZE(&j_inode->i_ext2)) {
retval = EXT2_ET_JOURNAL_TOO_SMALL;
goto try_backup_journal;
}
if (tried_backup_jnl && (fs->flags & EXT2_FLAG_RW)) {
retval = ext2fs_write_inode(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(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;
fs->journal_io = fs->io;
retval = (errcode_t)journal_bmap(journal, 0, &start);
if (retval)
goto errout;
#endif
} else {
ext_journal = 1;
if (!fs->journal_name) {
char uuid[37];
blkid_cache blkid;
blkid_get_cache(&blkid, NULL);
uuid_unparse(sb->s_journal_uuid, uuid);
fs->journal_name = blkid_get_devname(blkid,
"UUID", uuid);
if (!fs->journal_name)
fs->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
blkid_put_cache(blkid);
}
journal_name = fs->journal_name;
if (!journal_name) {
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
{
retval = io_ptr->open(journal_name, fs->flags & EXT2_FLAG_RW,
&fs->journal_io);
}
if (retval)
goto errout;
io_channel_set_blksize(fs->journal_io, fs->blocksize);
if (ext_journal) {
blk64_t maxlen;
start = ext2fs_journal_sb_start(fs->blocksize) - 1;
bh = getblk(dev_journal, start, fs->blocksize);
if (!bh) {
retval = EXT2_ET_NO_MEMORY;
goto errout;
}
ll_rw_block(READ, 1, &bh);
retval = bh->b_err;
if (retval) {
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)) {
retval = EXT2_ET_LOAD_EXT_JOURNAL;
brelse(bh);
goto errout;
}
/* Make sure the journal UUID is correct */
if (memcmp(jsuper.s_uuid, fs->super->s_journal_uuid,
sizeof(jsuper.s_uuid))) {
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, fs, sizeof(fsx));
memcpy(&superx, fs->super, sizeof(superx));
fsx.super = &superx;
ext2fs_set_feature_metadata_csum(fsx.super);
if (!ext2fs_superblock_csum_verify(&fsx, p)) {
retval = EXT2_ET_LOAD_EXT_JOURNAL;
brelse(bh);
goto errout;
}
}
brelse(bh);
maxlen = ext2fs_blocks_count(&jsuper);
journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen :
(1ULL << 32) - 1;
start++;
}
bh = getblk(dev_journal, start, journal->j_blocksize);
if (!bh) {
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;
return 0;
errout:
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 journal_commit_trans(journal_transaction_t *trans)
{
struct buffer_head *bh, *cbh = NULL;
struct commit_header *commit;
#ifdef HAVE_SYS_TIME_H
struct timeval tv;
#endif
errcode_t err;
JOURNAL_CHECK_TRANS_MAGIC(trans);
if ((trans->flags & J_TRANS_COMMITTED) ||
!(trans->flags & J_TRANS_OPEN))
return EXT2_ET_INVALID_ARGUMENT;
bh = getblk(trans->journal->j_dev, 0, trans->journal->j_blocksize);
if (bh == NULL)
return ENOMEM;
/* write the descriptor block header */
commit = (struct commit_header *)bh->b_data;
commit->h_magic = ext2fs_cpu_to_be32(JFS_MAGIC_NUMBER);
commit->h_blocktype = ext2fs_cpu_to_be32(JFS_COMMIT_BLOCK);
commit->h_sequence = ext2fs_cpu_to_be32(trans->tid);
if (JFS_HAS_COMPAT_FEATURE(trans->journal,
JFS_FEATURE_COMPAT_CHECKSUM)) {
__u32 csum_v1 = ~0;
blk64_t cblk;
cbh = getblk(trans->journal->j_dev, 0,
trans->journal->j_blocksize);
if (cbh == NULL) {
err = ENOMEM;
goto error;
}
for (cblk = trans->start; cblk < trans->block; cblk++) {
err = journal_bmap(trans->journal, cblk,
&cbh->b_blocknr);
if (err)
goto error;
mark_buffer_uptodate(cbh, 0);
ll_rw_block(READ, 1, &cbh);
err = cbh->b_err;
if (err)
goto error;
csum_v1 = ext2fs_crc32_be(csum_v1,
(unsigned char const *)cbh->b_data,
cbh->b_size);
}
commit->h_chksum_type = JFS_CRC32_CHKSUM;
commit->h_chksum_size = JFS_CRC32_CHKSUM_SIZE;
commit->h_chksum[0] = ext2fs_cpu_to_be32(csum_v1);
} else {
commit->h_chksum_type = 0;
commit->h_chksum_size = 0;
commit->h_chksum[0] = 0;
}
#ifdef HAVE_SYS_TIME_H
gettimeofday(&tv, NULL);
commit->h_commit_sec = ext2fs_cpu_to_be32(tv.tv_sec);
commit->h_commit_nsec = ext2fs_cpu_to_be32(tv.tv_usec * 1000);
#else
commit->h_commit_sec = 0;
commit->h_commit_nsec = 0;
#endif
/* Write block */
jbd2_commit_block_csum_set(trans->journal, bh);
err = journal_bmap(trans->journal, trans->block, &bh->b_blocknr);
if (err)
goto error;
dbg_printf("Writing commit block at %llu:%llu\n", trans->block,
bh->b_blocknr);
mark_buffer_dirty(bh);
ll_rw_block(WRITE, 1, &bh);
err = bh->b_err;
if (err)
goto error;
trans->flags |= J_TRANS_COMMITTED;
trans->flags &= ~J_TRANS_OPEN;
trans->block++;
trans->fs->super->s_feature_incompat |= EXT3_FEATURE_INCOMPAT_RECOVER;
ext2fs_mark_super_dirty(trans->fs);
error:
if (cbh)
brelse(cbh);
brelse(bh);
return err;
}
errcode_t journal_find_head(journal_t *journal)
{
unsigned int next_commit_ID;
blk64_t next_log_block, head_block;
int err;
journal_superblock_t *sb;
journal_header_t *tmp;
struct buffer_head *bh;
unsigned int sequence;
int blocktype;
/*
* First thing is to establish what we expect to find in the log
* (in terms of transaction IDs), and where (in terms of log
* block offsets): query the superblock.
*/
sb = journal->j_superblock;
next_commit_ID = ext2fs_be32_to_cpu(sb->s_sequence);
next_log_block = ext2fs_be32_to_cpu(sb->s_start);
head_block = next_log_block;
if (next_log_block == 0)
return 0;
bh = getblk(journal->j_dev, 0, journal->j_blocksize);
if (bh == NULL)
return ENOMEM;
/*
* Now we walk through the log, transaction by transaction,
* making sure that each transaction has a commit block in the
* expected place. Each complete transaction gets replayed back
* into the main filesystem.
*/
while (1) {
dbg_printf("Scanning for sequence ID %u at %lu/%lu\n",
next_commit_ID, (unsigned long)next_log_block,
journal->j_last);
/* Skip over each chunk of the transaction looking
* either the next descriptor block or the final commit
* record. */
err = journal_bmap(journal, next_log_block, &bh->b_blocknr);
if (err)
goto err;
mark_buffer_uptodate(bh, 0);
ll_rw_block(READ, 1, &bh);
err = bh->b_err;
if (err)
goto err;
next_log_block++;
wrap(journal, next_log_block);
/* What kind of buffer is it?
*
* If it is a descriptor block, check that it has the
* expected sequence number. Otherwise, we're all done
* here. */
tmp = (journal_header_t *)bh->b_data;
if (tmp->h_magic != ext2fs_cpu_to_be32(JFS_MAGIC_NUMBER)) {
dbg_printf("JBD2: wrong magic 0x%x\n", tmp->h_magic);
goto err;
}
blocktype = ext2fs_be32_to_cpu(tmp->h_blocktype);
sequence = ext2fs_be32_to_cpu(tmp->h_sequence);
dbg_printf("Found magic %d, sequence %d\n",
blocktype, sequence);
if (sequence != next_commit_ID) {
dbg_printf("JBD2: Wrong sequence %d (wanted %d)\n",
sequence, next_commit_ID);
goto err;
}
/* OK, we have a valid descriptor block which matches
* all of the sequence number checks. What are we going
* to do with it? That depends on the pass... */
switch (blocktype) {
case JFS_DESCRIPTOR_BLOCK:
next_log_block += count_tags(journal, bh->b_data);
wrap(journal, next_log_block);
continue;
case JFS_COMMIT_BLOCK:
head_block = next_log_block;
next_commit_ID++;
continue;
case JFS_REVOKE_BLOCK:
continue;
default:
dbg_printf("Unrecognised magic %d, end of scan.\n",
blocktype);
err = -EINVAL;
goto err;
}
}
err:
if (err == 0) {
dbg_printf("head seq=%d blk=%llu\n", next_commit_ID,
head_block);
journal->j_transaction_sequence = next_commit_ID;
journal->j_head = head_block;
}
brelse(bh);
return err;
}
static errcode_t journal_add_blocks_to_trans(journal_transaction_t *trans,
blk64_t *block_list, size_t block_len,
FILE *fp)
{
blk64_t curr_blk, jdb_blk;
size_t i, j;
int csum_size = 0;
journal_header_t *jdb;
journal_block_tag_t *jdbt;
int tag_bytes;
void *buf = NULL, *jdb_buf = NULL;
struct buffer_head *bh = NULL, *data_bh;
errcode_t err;
JOURNAL_CHECK_TRANS_MAGIC(trans);
if ((trans->flags & J_TRANS_COMMITTED) ||
!(trans->flags & J_TRANS_OPEN))
return EXT2_ET_INVALID_ARGUMENT;
if (block_len == 0)
return 0;
/* Do we need to leave space at the end for a checksum? */
if (journal_has_csum_v2or3(trans->journal))
csum_size = sizeof(struct journal_block_tail);
curr_blk = jdb_blk = trans->block;
data_bh = getblk(trans->journal->j_dev, curr_blk,
trans->journal->j_blocksize);
if (data_bh == NULL)
return ENOMEM;
buf = data_bh->b_data;
/* write the descriptor block header */
bh = getblk(trans->journal->j_dev, curr_blk,
trans->journal->j_blocksize);
if (bh == NULL) {
err = ENOMEM;
goto error;
}
jdb = jdb_buf = bh->b_data;
jdb->h_magic = ext2fs_cpu_to_be32(JFS_MAGIC_NUMBER);
jdb->h_blocktype = ext2fs_cpu_to_be32(JFS_DESCRIPTOR_BLOCK);
jdb->h_sequence = ext2fs_cpu_to_be32(trans->tid);
jdbt = (journal_block_tag_t *)(jdb + 1);
curr_blk++;
for (i = 0; i < block_len; i++) {
j = fread(data_bh->b_data, trans->journal->j_blocksize, 1, fp);
if (j != 1) {
err = errno;
goto error;
}
tag_bytes = journal_tag_bytes(trans->journal);
/* No space left in descriptor block, write it out */
if ((char *)jdbt + tag_bytes >
(char *)jdb_buf + trans->journal->j_blocksize - csum_size) {
jbd2_descr_block_csum_set(trans->journal, bh);
err = journal_bmap(trans->journal, jdb_blk,
&bh->b_blocknr);
if (err)
goto error;
dbg_printf("Writing descriptor block at %llu:%llu\n",
jdb_blk, bh->b_blocknr);
mark_buffer_dirty(bh);
ll_rw_block(WRITE, 1, &bh);
err = bh->b_err;
if (err)
goto error;
jdbt = (journal_block_tag_t *)(jdb + 1);
jdb_blk = curr_blk;
curr_blk++;
}
if (block_list[i] >=
ext2fs_blocks_count(trans->journal->j_fs_dev->k_fs->super)) {
err = EXT2_ET_BAD_BLOCK_NUM;
goto error;
}
/* Fill out the block tag */
jdbt->t_blocknr = ext2fs_cpu_to_be32(block_list[i] & 0xFFFFFFFF);
jdbt->t_flags = 0;
if (jdbt != (journal_block_tag_t *)(jdb + 1))
jdbt->t_flags |= ext2fs_cpu_to_be16(JFS_FLAG_SAME_UUID);
else {
memcpy(jdbt + tag_bytes,
trans->journal->j_superblock->s_uuid,
sizeof(trans->journal->j_superblock->s_uuid));
tag_bytes += 16;
}
if (i == block_len - 1)
jdbt->t_flags |= ext2fs_cpu_to_be16(JFS_FLAG_LAST_TAG);
if (*((__u32 *)buf) == ext2fs_cpu_to_be32(JFS_MAGIC_NUMBER)) {
*((__u32 *)buf) = 0;
jdbt->t_flags |= ext2fs_cpu_to_be16(JFS_FLAG_ESCAPE);
}
if (JFS_HAS_INCOMPAT_FEATURE(trans->journal,
JFS_FEATURE_INCOMPAT_64BIT))
jdbt->t_blocknr_high = ext2fs_cpu_to_be32(block_list[i] >> 32);
jbd2_block_tag_csum_set(trans->journal, jdbt, data_bh,
trans->tid);
/* Write the data block */
err = journal_bmap(trans->journal, curr_blk,
&data_bh->b_blocknr);
if (err)
goto error;
dbg_printf("Writing data block %llu at %llu:%llu tag %d\n",
block_list[i], curr_blk, data_bh->b_blocknr,
tag_bytes);
mark_buffer_dirty(data_bh);
ll_rw_block(WRITE, 1, &data_bh);
err = data_bh->b_err;
if (err)
goto error;
curr_blk++;
jdbt = (journal_block_tag_t *)(((char *)jdbt) + tag_bytes);
}
/* Write out the last descriptor block */
if (jdbt != (journal_block_tag_t *)(jdb + 1)) {
jbd2_descr_block_csum_set(trans->journal, bh);
err = journal_bmap(trans->journal, jdb_blk, &bh->b_blocknr);
if (err)
goto error;
dbg_printf("Writing descriptor block at %llu:%llu\n",
jdb_blk, bh->b_blocknr);
mark_buffer_dirty(bh);
ll_rw_block(WRITE, 1, &bh);
err = bh->b_err;
if (err)
goto error;
}
error:
trans->block = curr_blk;
if (bh)
brelse(bh);
brelse(data_bh);
return err;
}
static errcode_t journal_add_revoke_to_trans(journal_transaction_t *trans,
blk64_t *revoke_list,
size_t revoke_len)
{
journal_revoke_header_t *jrb;
void *buf;
size_t i, offset;
blk64_t curr_blk;
int sz, csum_size = 0;
struct buffer_head *bh;
errcode_t err;
JOURNAL_CHECK_TRANS_MAGIC(trans);
if ((trans->flags & J_TRANS_COMMITTED) ||
!(trans->flags & J_TRANS_OPEN))
return EXT2_ET_INVALID_ARGUMENT;
if (revoke_len == 0)
return 0;
/* Do we need to leave space at the end for a checksum? */
if (journal_has_csum_v2or3(trans->journal))
csum_size = sizeof(struct journal_revoke_tail);
curr_blk = trans->block;
bh = getblk(trans->journal->j_dev, curr_blk,
trans->journal->j_blocksize);
if (bh == NULL)
return ENOMEM;
jrb = buf = bh->b_data;
jrb->r_header.h_magic = ext2fs_cpu_to_be32(JFS_MAGIC_NUMBER);
jrb->r_header.h_blocktype = ext2fs_cpu_to_be32(JFS_REVOKE_BLOCK);
jrb->r_header.h_sequence = ext2fs_cpu_to_be32(trans->tid);
offset = sizeof(*jrb);
if (JFS_HAS_INCOMPAT_FEATURE(trans->journal,
JFS_FEATURE_INCOMPAT_64BIT))
sz = 8;
else
sz = 4;
for (i = 0; i < revoke_len; i++) {
/* Block full, write to journal */
if (offset + sz > trans->journal->j_blocksize - csum_size) {
jrb->r_count = ext2fs_cpu_to_be32(offset);
jbd2_revoke_csum_set(trans->journal, bh);
err = journal_bmap(trans->journal, curr_blk,
&bh->b_blocknr);
if (err)
goto error;
dbg_printf("Writing revoke block at %llu:%llu\n",
curr_blk, bh->b_blocknr);
mark_buffer_dirty(bh);
ll_rw_block(WRITE, 1, &bh);
err = bh->b_err;
if (err)
goto error;
offset = sizeof(*jrb);
curr_blk++;
}
if (revoke_list[i] >=
ext2fs_blocks_count(trans->journal->j_fs_dev->k_fs->super)) {
err = EXT2_ET_BAD_BLOCK_NUM;
goto error;
}
if (JFS_HAS_INCOMPAT_FEATURE(trans->journal,
JFS_FEATURE_INCOMPAT_64BIT))
*((__u64 *)(&((char *)buf)[offset])) =
ext2fs_cpu_to_be64(revoke_list[i]);
else
*((__u32 *)(&((char *)buf)[offset])) =
ext2fs_cpu_to_be32(revoke_list[i]);
offset += sz;
}
if (offset > 0) {
jrb->r_count = ext2fs_cpu_to_be32(offset);
jbd2_revoke_csum_set(trans->journal, bh);
err = journal_bmap(trans->journal, curr_blk, &bh->b_blocknr);
if (err)
goto error;
dbg_printf("Writing revoke block at %llu:%llu\n",
curr_blk, bh->b_blocknr);
mark_buffer_dirty(bh);
ll_rw_block(WRITE, 1, &bh);
err = bh->b_err;
if (err)
goto error;
curr_blk++;
}
error:
trans->block = curr_blk;
brelse(bh);
return err;
}