static errcode_t ext3u_write_inode(ext2_filsys fs, ext2_ino_t undel_ino, int flags)
{
char *buf;
errcode_t retval;
struct ext2_inode inode;
struct mk_ext3u_struct es;
__u32 num_blocks = ext3u_fifo_reserved + ext3u_skip_reserved + ext3u_index_reserved + 1;
if ((retval = ext3u_create_superblock(fs, flags, &buf)))
return retval;
if ((retval = ext2fs_read_bitmaps(fs)))
return retval;
if ((retval = ext2fs_read_inode(fs, undel_ino, &inode)))
return retval;
if (inode.i_blocks > 0)
return EEXIST;
es.goal = 0;
es.num_blocks = num_blocks;
es.newblocks = 0;
es.buf = buf;
es.err = 0;
es.zero_count = 0;
retval = ext2fs_block_iterate2(fs, undel_ino, BLOCK_FLAG_APPEND, 0, mk_ext3u_proc, &es);
if (es.err) {
retval = es.err;
goto errout;
}
if (es.zero_count) {
retval = ext2fs_zero_blocks(fs, es.blk_to_zero, es.zero_count, 0, 0);
if (retval)
goto errout;
}
if ((retval = ext2fs_read_inode(fs, undel_ino, &inode)))
goto errout;
inode.i_size += fs->blocksize * num_blocks;
ext2fs_iblk_add_blocks(fs, &inode, es.newblocks);
inode.i_mtime = inode.i_ctime = fs->now ? fs->now : time(0);
inode.i_links_count = 1;
inode.i_mode = LINUX_S_IFREG | 0600;
if ((retval = ext2fs_write_inode(fs, undel_ino, &inode)))
goto errout;
retval = 0;
errout:
ext2fs_free_mem(&buf);
return retval;
}
/*
* This function creates a journal using direct I/O routines.
*/
static errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino,
blk_t size, int flags)
{
char *buf;
dgrp_t group, start, end, i, log_flex;
errcode_t retval;
struct ext2_inode inode;
struct mkjournal_struct es;
if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))
return retval;
if ((retval = ext2fs_read_bitmaps(fs)))
return retval;
if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
return retval;
if (inode.i_blocks > 0)
return EEXIST;
es.num_blocks = size;
es.newblocks = 0;
es.buf = buf;
es.err = 0;
es.zero_count = 0;
if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
inode.i_flags |= EXT4_EXTENTS_FL;
if ((retval = ext2fs_write_inode(fs, journal_ino, &inode)))
return retval;
}
/*
* Set the initial goal block to be roughly at the middle of
* the filesystem. Pick a group that has the largest number
* of free blocks.
*/
group = ext2fs_group_of_blk(fs, (fs->super->s_blocks_count -
fs->super->s_first_data_block) / 2);
log_flex = 1 << fs->super->s_log_groups_per_flex;
if (fs->super->s_log_groups_per_flex && (group > log_flex)) {
group = group & ~(log_flex - 1);
while ((group < fs->group_desc_count) &&
fs->group_desc[group].bg_free_blocks_count == 0)
group++;
if (group == fs->group_desc_count)
group = 0;
start = group;
} else
start = (group > 0) ? group-1 : group;
end = ((group+1) < fs->group_desc_count) ? group+1 : group;
group = start;
for (i=start+1; i <= end; i++)
if (fs->group_desc[i].bg_free_blocks_count >
fs->group_desc[group].bg_free_blocks_count)
group = i;
es.goal = (fs->super->s_blocks_per_group * group) +
fs->super->s_first_data_block;
retval = ext2fs_block_iterate2(fs, journal_ino, BLOCK_FLAG_APPEND,
0, mkjournal_proc, &es);
if (es.err) {
retval = es.err;
goto errout;
}
if (es.zero_count) {
retval = ext2fs_zero_blocks(fs, es.blk_to_zero,
es.zero_count, 0, 0);
if (retval)
goto errout;
}
if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
goto errout;
inode.i_size += fs->blocksize * size;
ext2fs_iblk_add_blocks(fs, &inode, es.newblocks);
inode.i_mtime = inode.i_ctime = fs->now ? fs->now : time(0);
inode.i_links_count = 1;
inode.i_mode = LINUX_S_IFREG | 0600;
if ((retval = ext2fs_write_new_inode(fs, journal_ino, &inode)))
goto errout;
retval = 0;
memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
fs->super->s_jnl_blocks[16] = inode.i_size;
fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
ext2fs_mark_super_dirty(fs);
errout:
ext2fs_free_mem(&buf);
return retval;
}
static int mkjournal_proc(ext2_filsys fs,
blk_t *blocknr,
e2_blkcnt_t blockcnt,
blk_t ref_block EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data)
{
struct mkjournal_struct *es = (struct mkjournal_struct *) priv_data;
blk_t new_blk;
errcode_t retval;
if (*blocknr) {
es->goal = *blocknr;
return 0;
}
retval = ext2fs_new_block(fs, es->goal, 0, &new_blk);
if (retval) {
es->err = retval;
return BLOCK_ABORT;
}
if (blockcnt >= 0)
es->num_blocks--;
es->newblocks++;
retval = 0;
if (blockcnt <= 0)
retval = io_channel_write_blk(fs->io, new_blk, 1, es->buf);
else {
if (es->zero_count) {
if ((es->blk_to_zero + es->zero_count == new_blk) &&
(es->zero_count < 1024))
es->zero_count++;
else {
retval = ext2fs_zero_blocks(fs,
es->blk_to_zero,
es->zero_count,
0, 0);
es->zero_count = 0;
}
}
if (es->zero_count == 0) {
es->blk_to_zero = new_blk;
es->zero_count = 1;
}
}
if (blockcnt == 0)
memset(es->buf, 0, fs->blocksize);
if (retval) {
es->err = retval;
return BLOCK_ABORT;
}
*blocknr = es->goal = new_blk;
ext2fs_block_alloc_stats(fs, new_blk, +1);
if (es->num_blocks == 0)
return (BLOCK_CHANGED | BLOCK_ABORT);
else
return BLOCK_CHANGED;
}
