-static void delete_single_indirect_block(struct ext2_inode *inode)
-{
- struct ext2_block_group *bgd = NULL;
- static int prev_bg_bmap_idx = -1;
- long int blknr;
- int remainder;
- int bg_idx;
- int status;
- unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
- struct ext_filesystem *fs = get_fs();
- char *journal_buffer = zalloc(fs->blksz);
- if (!journal_buffer) {
- printf("No memory\n");
- return;
- }
- /* get block group descriptor table */
- bgd = (struct ext2_block_group *)fs->gdtable;
-
- /* deleting the single indirect block associated with inode */
- if (inode->b.blocks.indir_block != 0) {
- debug("SIPB releasing %u\n", inode->b.blocks.indir_block);
- blknr = inode->b.blocks.indir_block;
- if (fs->blksz != 1024) {
- bg_idx = blknr / blk_per_grp;
- } else {
- bg_idx = blknr / blk_per_grp;
- remainder = blknr % blk_per_grp;
- if (!remainder)
- bg_idx--;
- }
- ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
- bgd[bg_idx].free_blocks++;
- fs->sb->free_blocks++;
- /* journal backup */
- if (prev_bg_bmap_idx != bg_idx) {
- status =
- ext4fs_devread(bgd[bg_idx].block_id *
- fs->sect_perblk, 0, fs->blksz,
- journal_buffer);
- if (status == 0)
- goto fail;
- if (ext4fs_log_journal
- (journal_buffer, bgd[bg_idx].block_id))
- goto fail;
- prev_bg_bmap_idx = bg_idx;
- }
- }
-fail:
- free(journal_buffer);
-}
-
-static void delete_double_indirect_block(struct ext2_inode *inode)
-{
- int i;
- short status;
- static int prev_bg_bmap_idx = -1;
- long int blknr;
- int remainder;
- int bg_idx;
- unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
- unsigned int *di_buffer = NULL;
- unsigned int *DIB_start_addr = NULL;
- struct ext2_block_group *bgd = NULL;
- struct ext_filesystem *fs = get_fs();
- char *journal_buffer = zalloc(fs->blksz);
- if (!journal_buffer) {
- printf("No memory\n");
- return;
- }
- /* get the block group descriptor table */
- bgd = (struct ext2_block_group *)fs->gdtable;
-
- if (inode->b.blocks.double_indir_block != 0) {
- di_buffer = zalloc(fs->blksz);
- if (!di_buffer) {
- printf("No memory\n");
- return;
- }
- DIB_start_addr = (unsigned int *)di_buffer;
- blknr = inode->b.blocks.double_indir_block;
- status = ext4fs_devread(blknr * fs->sect_perblk, 0, fs->blksz,
- (char *)di_buffer);
- for (i = 0; i < fs->blksz / sizeof(int); i++) {
- if (*di_buffer == 0)
- break;
-
- debug("DICB releasing %u\n", *di_buffer);
- if (fs->blksz != 1024) {
- bg_idx = (*di_buffer) / blk_per_grp;
- } else {
- bg_idx = (*di_buffer) / blk_per_grp;
- remainder = (*di_buffer) % blk_per_grp;
- if (!remainder)
- bg_idx--;
- }
- ext4fs_reset_block_bmap(*di_buffer,
- fs->blk_bmaps[bg_idx], bg_idx);
- di_buffer++;
- bgd[bg_idx].free_blocks++;
- fs->sb->free_blocks++;
- /* journal backup */
- if (prev_bg_bmap_idx != bg_idx) {
- status = ext4fs_devread(bgd[bg_idx].block_id
- * fs->sect_perblk, 0,
- fs->blksz,
- journal_buffer);
- if (status == 0)
- goto fail;
-
- if (ext4fs_log_journal(journal_buffer,
- bgd[bg_idx].block_id))
- goto fail;
- prev_bg_bmap_idx = bg_idx;
- }
- }
-
- /* removing the parent double indirect block */
- blknr = inode->b.blocks.double_indir_block;
- if (fs->blksz != 1024) {
- bg_idx = blknr / blk_per_grp;
- } else {
- bg_idx = blknr / blk_per_grp;
- remainder = blknr % blk_per_grp;
- if (!remainder)
- bg_idx--;
- }
- ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
- bgd[bg_idx].free_blocks++;
- fs->sb->free_blocks++;
- /* journal backup */
- if (prev_bg_bmap_idx != bg_idx) {
- memset(journal_buffer, '\0', fs->blksz);
- status = ext4fs_devread(bgd[bg_idx].block_id *
- fs->sect_perblk, 0, fs->blksz,
- journal_buffer);
- if (status == 0)
- goto fail;
-
- if (ext4fs_log_journal(journal_buffer,
- bgd[bg_idx].block_id))
- goto fail;
- prev_bg_bmap_idx = bg_idx;
- }
- debug("DIPB releasing %ld\n", blknr);
- }
-fail:
- free(DIB_start_addr);
- free(journal_buffer);
-}
-
-static void delete_triple_indirect_block(struct ext2_inode *inode)
-{
- int i, j;
- short status;
- static int prev_bg_bmap_idx = -1;
- long int blknr;
- int remainder;
- int bg_idx;
- unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
- unsigned int *tigp_buffer = NULL;
- unsigned int *tib_start_addr = NULL;
- unsigned int *tip_buffer = NULL;
- unsigned int *tipb_start_addr = NULL;
- struct ext2_block_group *bgd = NULL;
- struct ext_filesystem *fs = get_fs();
- char *journal_buffer = zalloc(fs->blksz);
- if (!journal_buffer) {
- printf("No memory\n");
- return;
- }
- /* get block group descriptor table */
- bgd = (struct ext2_block_group *)fs->gdtable;
-
- if (inode->b.blocks.triple_indir_block != 0) {
- tigp_buffer = zalloc(fs->blksz);
- if (!tigp_buffer) {
- printf("No memory\n");
- return;
- }
- tib_start_addr = (unsigned int *)tigp_buffer;
- blknr = inode->b.blocks.triple_indir_block;
- status = ext4fs_devread(blknr * fs->sect_perblk, 0, fs->blksz,
- (char *)tigp_buffer);
- for (i = 0; i < fs->blksz / sizeof(int); i++) {
- if (*tigp_buffer == 0)
- break;
- debug("tigp buffer releasing %u\n", *tigp_buffer);
-
- tip_buffer = zalloc(fs->blksz);
- if (!tip_buffer)
- goto fail;
- tipb_start_addr = (unsigned int *)tip_buffer;
- status = ext4fs_devread((*tigp_buffer) *
- fs->sect_perblk, 0, fs->blksz,
- (char *)tip_buffer);
- for (j = 0; j < fs->blksz / sizeof(int); j++) {
- if (*tip_buffer == 0)
- break;
- if (fs->blksz != 1024) {
- bg_idx = (*tip_buffer) / blk_per_grp;
- } else {
- bg_idx = (*tip_buffer) / blk_per_grp;
-
- remainder = (*tip_buffer) % blk_per_grp;
- if (!remainder)
- bg_idx--;
- }
-
- ext4fs_reset_block_bmap(*tip_buffer,
- fs->blk_bmaps[bg_idx],
- bg_idx);
-
- tip_buffer++;
- bgd[bg_idx].free_blocks++;
- fs->sb->free_blocks++;
- /* journal backup */
- if (prev_bg_bmap_idx != bg_idx) {
- status =
- ext4fs_devread(
- bgd[bg_idx].block_id *
- fs->sect_perblk, 0,
- fs->blksz,
- journal_buffer);
- if (status == 0)
- goto fail;
-
- if (ext4fs_log_journal(journal_buffer,
- bgd[bg_idx].
- block_id))
- goto fail;
- prev_bg_bmap_idx = bg_idx;
- }
- }
- free(tipb_start_addr);
- tipb_start_addr = NULL;
-
- /*
- * removing the grand parent blocks
- * which is connected to inode
- */
- if (fs->blksz != 1024) {
- bg_idx = (*tigp_buffer) / blk_per_grp;
- } else {
- bg_idx = (*tigp_buffer) / blk_per_grp;
-
- remainder = (*tigp_buffer) % blk_per_grp;
- if (!remainder)
- bg_idx--;
- }
- ext4fs_reset_block_bmap(*tigp_buffer,
- fs->blk_bmaps[bg_idx], bg_idx);
-
- tigp_buffer++;
- bgd[bg_idx].free_blocks++;
- fs->sb->free_blocks++;
- /* journal backup */
- if (prev_bg_bmap_idx != bg_idx) {
- memset(journal_buffer, '\0', fs->blksz);
- status =
- ext4fs_devread(bgd[bg_idx].block_id *
- fs->sect_perblk, 0,
- fs->blksz, journal_buffer);
- if (status == 0)
- goto fail;
-
- if (ext4fs_log_journal(journal_buffer,
- bgd[bg_idx].block_id))
- goto fail;
- prev_bg_bmap_idx = bg_idx;
- }
- }
-
- /* removing the grand parent triple indirect block */
- blknr = inode->b.blocks.triple_indir_block;
- if (fs->blksz != 1024) {
- bg_idx = blknr / blk_per_grp;
- } else {
- bg_idx = blknr / blk_per_grp;
- remainder = blknr % blk_per_grp;
- if (!remainder)
- bg_idx--;
- }
- ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
- bgd[bg_idx].free_blocks++;
- fs->sb->free_blocks++;
- /* journal backup */
- if (prev_bg_bmap_idx != bg_idx) {
- memset(journal_buffer, '\0', fs->blksz);
- status = ext4fs_devread(bgd[bg_idx].block_id *
- fs->sect_perblk, 0, fs->blksz,
- journal_buffer);
- if (status == 0)
- goto fail;
-
- if (ext4fs_log_journal(journal_buffer,
- bgd[bg_idx].block_id))
- goto fail;
- prev_bg_bmap_idx = bg_idx;
- }
- debug("tigp buffer itself releasing %ld\n", blknr);
- }
-fail:
- free(tib_start_addr);
- free(tipb_start_addr);
- free(journal_buffer);
-}
-
-static int ext4fs_delete_file(int inodeno)