| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * (C) Copyright 2011 - 2012 Samsung Electronics |
| * EXT4 filesystem implementation in Uboot by |
| * Uma Shankar <uma.shankar@samsung.com> |
| * Manjunatha C Achar <a.manjunatha@samsung.com> |
| * |
| * ext4ls and ext4load : Based on ext2 ls and load support in Uboot. |
| * Ext4 read optimization taken from Open-Moko |
| * Qi bootloader |
| * |
| * (C) Copyright 2004 |
| * esd gmbh <www.esd-electronics.com> |
| * Reinhard Arlt <reinhard.arlt@esd-electronics.com> |
| * |
| * based on code from grub2 fs/ext2.c and fs/fshelp.c by |
| * GRUB -- GRand Unified Bootloader |
| * Copyright (C) 2003, 2004 Free Software Foundation, Inc. |
| * |
| * ext4write : Based on generic ext4 protocol. |
| */ |
| |
| |
| #include <common.h> |
| #include <memalign.h> |
| #include <linux/stat.h> |
| #include <div64.h> |
| #include "ext4_common.h" |
| |
| static inline void ext4fs_sb_free_inodes_inc(struct ext2_sblock *sb) |
| { |
| sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) + 1); |
| } |
| |
| static inline void ext4fs_sb_free_blocks_inc(struct ext2_sblock *sb) |
| { |
| sb->free_blocks = cpu_to_le32(le32_to_cpu(sb->free_blocks) + 1); |
| } |
| |
| static inline void ext4fs_bg_free_inodes_inc |
| (struct ext2_block_group *bg, const struct ext_filesystem *fs) |
| { |
| uint32_t free_inodes = le16_to_cpu(bg->free_inodes); |
| if (fs->gdsize == 64) |
| free_inodes += le16_to_cpu(bg->free_inodes_high) << 16; |
| free_inodes++; |
| |
| bg->free_inodes = cpu_to_le16(free_inodes & 0xffff); |
| if (fs->gdsize == 64) |
| bg->free_inodes_high = cpu_to_le16(free_inodes >> 16); |
| } |
| |
| static inline void ext4fs_bg_free_blocks_inc |
| (struct ext2_block_group *bg, const struct ext_filesystem *fs) |
| { |
| uint32_t free_blocks = le16_to_cpu(bg->free_blocks); |
| if (fs->gdsize == 64) |
| free_blocks += le16_to_cpu(bg->free_blocks_high) << 16; |
| free_blocks++; |
| |
| bg->free_blocks = cpu_to_le16(free_blocks & 0xffff); |
| if (fs->gdsize == 64) |
| bg->free_blocks_high = cpu_to_le16(free_blocks >> 16); |
| } |
| |
| static void ext4fs_update(void) |
| { |
| short i; |
| ext4fs_update_journal(); |
| struct ext_filesystem *fs = get_fs(); |
| struct ext2_block_group *bgd = NULL; |
| |
| /* update super block */ |
| put_ext4((uint64_t)(SUPERBLOCK_SIZE), |
| (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE); |
| |
| /* update block bitmaps */ |
| for (i = 0; i < fs->no_blkgrp; i++) { |
| bgd = ext4fs_get_group_descriptor(fs, i); |
| bgd->bg_checksum = cpu_to_le16(ext4fs_checksum_update(i)); |
| uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs); |
| put_ext4(b_bitmap_blk * fs->blksz, |
| fs->blk_bmaps[i], fs->blksz); |
| } |
| |
| /* update inode bitmaps */ |
| for (i = 0; i < fs->no_blkgrp; i++) { |
| bgd = ext4fs_get_group_descriptor(fs, i); |
| uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs); |
| put_ext4(i_bitmap_blk * fs->blksz, |
| fs->inode_bmaps[i], fs->blksz); |
| } |
| |
| /* update the block group descriptor table */ |
| put_ext4((uint64_t)((uint64_t)fs->gdtable_blkno * (uint64_t)fs->blksz), |
| (struct ext2_block_group *)fs->gdtable, |
| (fs->blksz * fs->no_blk_pergdt)); |
| |
| ext4fs_dump_metadata(); |
| |
| gindex = 0; |
| gd_index = 0; |
| } |
| |
| int ext4fs_get_bgdtable(void) |
| { |
| int status; |
| struct ext_filesystem *fs = get_fs(); |
| int gdsize_total = ROUND(fs->no_blkgrp * fs->gdsize, fs->blksz); |
| fs->no_blk_pergdt = gdsize_total / fs->blksz; |
| |
| /* allocate memory for gdtable */ |
| fs->gdtable = zalloc(gdsize_total); |
| if (!fs->gdtable) |
| return -ENOMEM; |
| /* read the group descriptor table */ |
| status = ext4fs_devread((lbaint_t)fs->gdtable_blkno * fs->sect_perblk, |
| 0, fs->blksz * fs->no_blk_pergdt, fs->gdtable); |
| if (status == 0) |
| goto fail; |
| |
| if (ext4fs_log_gdt(fs->gdtable)) { |
| printf("Error in ext4fs_log_gdt\n"); |
| return -1; |
| } |
| |
| return 0; |
| fail: |
| free(fs->gdtable); |
| fs->gdtable = NULL; |
| |
| return -1; |
| } |
| |
| static void delete_single_indirect_block(struct ext2_inode *inode) |
| { |
| struct ext2_block_group *bgd = NULL; |
| static int prev_bg_bmap_idx = -1; |
| uint32_t blknr; |
| int remainder; |
| int bg_idx; |
| int status; |
| uint32_t blk_per_grp = le32_to_cpu(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; |
| } |
| |
| /* deleting the single indirect block associated with inode */ |
| if (inode->b.blocks.indir_block != 0) { |
| blknr = le32_to_cpu(inode->b.blocks.indir_block); |
| debug("SIPB releasing %u\n", blknr); |
| bg_idx = blknr / blk_per_grp; |
| if (fs->blksz == 1024) { |
| remainder = blknr % blk_per_grp; |
| if (!remainder) |
| bg_idx--; |
| } |
| ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx); |
| /* get block group descriptor table */ |
| bgd = ext4fs_get_group_descriptor(fs, bg_idx); |
| ext4fs_bg_free_blocks_inc(bgd, fs); |
| ext4fs_sb_free_blocks_inc(fs->sb); |
| /* journal backup */ |
| if (prev_bg_bmap_idx != bg_idx) { |
| uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs); |
| status = ext4fs_devread( |
| b_bitmap_blk * fs->sect_perblk, |
| 0, fs->blksz, journal_buffer); |
| if (status == 0) |
| goto fail; |
| if (ext4fs_log_journal(journal_buffer, b_bitmap_blk)) |
| 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; |
| uint32_t blknr; |
| int remainder; |
| int bg_idx; |
| uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); |
| __le32 *di_buffer = NULL; |
| void *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; |
| } |
| |
| if (inode->b.blocks.double_indir_block != 0) { |
| di_buffer = zalloc(fs->blksz); |
| if (!di_buffer) { |
| printf("No memory\n"); |
| return; |
| } |
| dib_start_addr = di_buffer; |
| blknr = le32_to_cpu(inode->b.blocks.double_indir_block); |
| status = ext4fs_devread((lbaint_t)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); |
| bg_idx = le32_to_cpu(*di_buffer) / blk_per_grp; |
| if (fs->blksz == 1024) { |
| remainder = le32_to_cpu(*di_buffer) % blk_per_grp; |
| if (!remainder) |
| bg_idx--; |
| } |
| /* get block group descriptor table */ |
| bgd = ext4fs_get_group_descriptor(fs, bg_idx); |
| ext4fs_reset_block_bmap(le32_to_cpu(*di_buffer), |
| fs->blk_bmaps[bg_idx], bg_idx); |
| di_buffer++; |
| ext4fs_bg_free_blocks_inc(bgd, fs); |
| ext4fs_sb_free_blocks_inc(fs->sb); |
| /* journal backup */ |
| if (prev_bg_bmap_idx != bg_idx) { |
| uint64_t b_bitmap_blk = |
| ext4fs_bg_get_block_id(bgd, fs); |
| status = ext4fs_devread(b_bitmap_blk |
| * fs->sect_perblk, 0, |
| fs->blksz, |
| journal_buffer); |
| if (status == 0) |
| goto fail; |
| |
| if (ext4fs_log_journal(journal_buffer, |
| b_bitmap_blk)) |
| goto fail; |
| prev_bg_bmap_idx = bg_idx; |
| } |
| } |
| |
| /* removing the parent double indirect block */ |
| blknr = le32_to_cpu(inode->b.blocks.double_indir_block); |
| bg_idx = blknr / blk_per_grp; |
| if (fs->blksz == 1024) { |
| remainder = blknr % blk_per_grp; |
| if (!remainder) |
| bg_idx--; |
| } |
| /* get block group descriptor table */ |
| bgd = ext4fs_get_group_descriptor(fs, bg_idx); |
| ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx); |
| ext4fs_bg_free_blocks_inc(bgd, fs); |
| ext4fs_sb_free_blocks_inc(fs->sb); |
| /* journal backup */ |
| if (prev_bg_bmap_idx != bg_idx) { |
| uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs); |
| status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk, |
| 0, fs->blksz, journal_buffer); |
| if (status == 0) |
| goto fail; |
| |
| if (ext4fs_log_journal(journal_buffer, b_bitmap_blk)) |
| goto fail; |
| prev_bg_bmap_idx = bg_idx; |
| } |
| debug("DIPB releasing %d\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; |
| uint32_t blknr; |
| int remainder; |
| int bg_idx; |
| uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); |
| __le32 *tigp_buffer = NULL; |
| void *tib_start_addr = NULL; |
| __le32 *tip_buffer = NULL; |
| void *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; |
| } |
| |
| if (inode->b.blocks.triple_indir_block != 0) { |
| tigp_buffer = zalloc(fs->blksz); |
| if (!tigp_buffer) { |
| printf("No memory\n"); |
| return; |
| } |
| tib_start_addr = tigp_buffer; |
| blknr = le32_to_cpu(inode->b.blocks.triple_indir_block); |
| status = ext4fs_devread((lbaint_t)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 = tip_buffer; |
| status = ext4fs_devread((lbaint_t)le32_to_cpu(*tigp_buffer) * |
| fs->sect_perblk, 0, fs->blksz, |
| (char *)tip_buffer); |
| for (j = 0; j < fs->blksz / sizeof(int); j++) { |
| if (le32_to_cpu(*tip_buffer) == 0) |
| break; |
| bg_idx = le32_to_cpu(*tip_buffer) / blk_per_grp; |
| if (fs->blksz == 1024) { |
| remainder = le32_to_cpu(*tip_buffer) % blk_per_grp; |
| if (!remainder) |
| bg_idx--; |
| } |
| |
| ext4fs_reset_block_bmap(le32_to_cpu(*tip_buffer), |
| fs->blk_bmaps[bg_idx], |
| bg_idx); |
| |
| tip_buffer++; |
| /* get block group descriptor table */ |
| bgd = ext4fs_get_group_descriptor(fs, bg_idx); |
| ext4fs_bg_free_blocks_inc(bgd, fs); |
| ext4fs_sb_free_blocks_inc(fs->sb); |
| /* journal backup */ |
| if (prev_bg_bmap_idx != bg_idx) { |
| uint64_t b_bitmap_blk = |
| ext4fs_bg_get_block_id(bgd, fs); |
| status = |
| ext4fs_devread( |
| b_bitmap_blk * |
| fs->sect_perblk, 0, |
| fs->blksz, |
| journal_buffer); |
| if (status == 0) |
| goto fail; |
| |
| if (ext4fs_log_journal(journal_buffer, |
| b_bitmap_blk)) |
| 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 |
| */ |
| bg_idx = le32_to_cpu(*tigp_buffer) / blk_per_grp; |
| if (fs->blksz == 1024) { |
| remainder = le32_to_cpu(*tigp_buffer) % blk_per_grp; |
| if (!remainder) |
| bg_idx--; |
| } |
| ext4fs_reset_block_bmap(le32_to_cpu(*tigp_buffer), |
| fs->blk_bmaps[bg_idx], bg_idx); |
| |
| tigp_buffer++; |
| /* get block group descriptor table */ |
| bgd = ext4fs_get_group_descriptor(fs, bg_idx); |
| ext4fs_bg_free_blocks_inc(bgd, fs); |
| ext4fs_sb_free_blocks_inc(fs->sb); |
| /* journal backup */ |
| if (prev_bg_bmap_idx != bg_idx) { |
| uint64_t b_bitmap_blk = |
| ext4fs_bg_get_block_id(bgd, fs); |
| memset(journal_buffer, '\0', fs->blksz); |
| status = ext4fs_devread(b_bitmap_blk * |
| fs->sect_perblk, 0, |
| fs->blksz, |
| journal_buffer); |
| if (status == 0) |
| goto fail; |
| |
| if (ext4fs_log_journal(journal_buffer, |
| b_bitmap_blk)) |
| goto fail; |
| prev_bg_bmap_idx = bg_idx; |
| } |
| } |
| |
| /* removing the grand parent triple indirect block */ |
| blknr = le32_to_cpu(inode->b.blocks.triple_indir_block); |
| bg_idx = blknr / blk_per_grp; |
| if (fs->blksz == 1024) { |
| remainder = blknr % blk_per_grp; |
| if (!remainder) |
| bg_idx--; |
| } |
| ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx); |
| /* get block group descriptor table */ |
| bgd = ext4fs_get_group_descriptor(fs, bg_idx); |
| ext4fs_bg_free_blocks_inc(bgd, fs); |
| ext4fs_sb_free_blocks_inc(fs->sb); |
| /* journal backup */ |
| if (prev_bg_bmap_idx != bg_idx) { |
| uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs); |
| status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk, |
| 0, fs->blksz, journal_buffer); |
| if (status == 0) |
| goto fail; |
| |
| if (ext4fs_log_journal(journal_buffer, b_bitmap_blk)) |
| goto fail; |
| prev_bg_bmap_idx = bg_idx; |
| } |
| debug("tigp buffer itself releasing %d\n", blknr); |
| } |
| fail: |
| free(tib_start_addr); |
| free(tipb_start_addr); |
| free(journal_buffer); |
| } |
| |
| static int ext4fs_delete_file(int inodeno) |
| { |
| struct ext2_inode inode; |
| short status; |
| int i; |
| int remainder; |
| long int blknr; |
| int bg_idx; |
| int ibmap_idx; |
| char *read_buffer = NULL; |
| char *start_block_address = NULL; |
| uint32_t no_blocks; |
| |
| static int prev_bg_bmap_idx = -1; |
| unsigned int inodes_per_block; |
| uint32_t blkno; |
| unsigned int blkoff; |
| uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); |
| uint32_t inode_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group); |
| struct ext2_inode *inode_buffer = NULL; |
| struct ext2_block_group *bgd = NULL; |
| struct ext_filesystem *fs = get_fs(); |
| char *journal_buffer = zalloc(fs->blksz); |
| if (!journal_buffer) |
| return -ENOMEM; |
| status = ext4fs_read_inode(ext4fs_root, inodeno, &inode); |
| if (status == 0) |
| goto fail; |
| |
| /* read the block no allocated to a file */ |
| no_blocks = le32_to_cpu(inode.size) / fs->blksz; |
| if (le32_to_cpu(inode.size) % fs->blksz) |
| no_blocks++; |
| |
| if (le32_to_cpu(inode.flags) & EXT4_EXTENTS_FL) { |
| /* FIXME delete extent index blocks, i.e. eh_depth >= 1 */ |
| struct ext4_extent_header *eh = |
| (struct ext4_extent_header *) |
| inode.b.blocks.dir_blocks; |
| debug("del: dep=%d entries=%d\n", eh->eh_depth, eh->eh_entries); |
| } else { |
| delete_single_indirect_block(&inode); |
| delete_double_indirect_block(&inode); |
| delete_triple_indirect_block(&inode); |
| } |
| |
| /* release data blocks */ |
| for (i = 0; i < no_blocks; i++) { |
| blknr = read_allocated_block(&inode, i); |
| if (blknr == 0) |
| continue; |
| if (blknr < 0) |
| goto fail; |
| bg_idx = blknr / blk_per_grp; |
| if (fs->blksz == 1024) { |
| remainder = blknr % blk_per_grp; |
| if (!remainder) |
| bg_idx--; |
| } |
| ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], |
| bg_idx); |
| debug("EXT4 Block releasing %ld: %d\n", blknr, bg_idx); |
| |
| /* get block group descriptor table */ |
| bgd = ext4fs_get_group_descriptor(fs, bg_idx); |
| ext4fs_bg_free_blocks_inc(bgd, fs); |
| ext4fs_sb_free_blocks_inc(fs->sb); |
| /* journal backup */ |
| if (prev_bg_bmap_idx != bg_idx) { |
| uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs); |
| status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk, |
| 0, fs->blksz, |
| journal_buffer); |
| if (status == 0) |
| goto fail; |
| if (ext4fs_log_journal(journal_buffer, b_bitmap_blk)) |
| goto fail; |
| prev_bg_bmap_idx = bg_idx; |
| } |
| } |
| |
| /* release inode */ |
| /* from the inode no to blockno */ |
| inodes_per_block = fs->blksz / fs->inodesz; |
| ibmap_idx = inodeno / inode_per_grp; |
| |
| /* get the block no */ |
| inodeno--; |
| /* get block group descriptor table */ |
| bgd = ext4fs_get_group_descriptor(fs, ibmap_idx); |
| blkno = ext4fs_bg_get_inode_table_id(bgd, fs) + |
| (inodeno % inode_per_grp) / inodes_per_block; |
| |
| /* get the offset of the inode */ |
| blkoff = ((inodeno) % inodes_per_block) * fs->inodesz; |
| |
| /* read the block no containing the inode */ |
| read_buffer = zalloc(fs->blksz); |
| if (!read_buffer) |
| goto fail; |
| start_block_address = read_buffer; |
| status = ext4fs_devread((lbaint_t)blkno * fs->sect_perblk, |
| 0, fs->blksz, read_buffer); |
| if (status == 0) |
| goto fail; |
| |
| if (ext4fs_log_journal(read_buffer, blkno)) |
| goto fail; |
| |
| read_buffer = read_buffer + blkoff; |
| inode_buffer = (struct ext2_inode *)read_buffer; |
| memset(inode_buffer, '\0', fs->inodesz); |
| |
| /* write the inode to original position in inode table */ |
| if (ext4fs_put_metadata(start_block_address, blkno)) |
| goto fail; |
| |
| /* update the respective inode bitmaps */ |
| inodeno++; |
| ext4fs_reset_inode_bmap(inodeno, fs->inode_bmaps[ibmap_idx], ibmap_idx); |
| ext4fs_bg_free_inodes_inc(bgd, fs); |
| ext4fs_sb_free_inodes_inc(fs->sb); |
| /* journal backup */ |
| memset(journal_buffer, '\0', fs->blksz); |
| status = ext4fs_devread(ext4fs_bg_get_inode_id(bgd, fs) * |
| fs->sect_perblk, 0, fs->blksz, journal_buffer); |
| if (status == 0) |
| goto fail; |
| if (ext4fs_log_journal(journal_buffer, ext4fs_bg_get_inode_id(bgd, fs))) |
| goto fail; |
| |
| ext4fs_update(); |
| ext4fs_deinit(); |
| ext4fs_reinit_global(); |
| |
| if (ext4fs_init() != 0) { |
| printf("error in File System init\n"); |
| goto fail; |
| } |
| |
| free(start_block_address); |
| free(journal_buffer); |
| |
| return 0; |
| fail: |
| free(start_block_address); |
| free(journal_buffer); |
| |
| return -1; |
| } |
| |
| int ext4fs_init(void) |
| { |
| short status; |
| int i; |
| uint32_t real_free_blocks = 0; |
| struct ext_filesystem *fs = get_fs(); |
| |
| /* populate fs */ |
| fs->blksz = EXT2_BLOCK_SIZE(ext4fs_root); |
| fs->sect_perblk = fs->blksz >> fs->dev_desc->log2blksz; |
| |
| /* get the superblock */ |
| fs->sb = zalloc(SUPERBLOCK_SIZE); |
| if (!fs->sb) |
| return -ENOMEM; |
| if (!ext4_read_superblock((char *)fs->sb)) |
| goto fail; |
| |
| /* init journal */ |
| if (ext4fs_init_journal()) |
| goto fail; |
| |
| /* get total no of blockgroups */ |
| fs->no_blkgrp = (uint32_t)ext4fs_div_roundup( |
| le32_to_cpu(ext4fs_root->sblock.total_blocks) |
| - le32_to_cpu(ext4fs_root->sblock.first_data_block), |
| le32_to_cpu(ext4fs_root->sblock.blocks_per_group)); |
| |
| /* get the block group descriptor table */ |
| fs->gdtable_blkno = ((EXT2_MIN_BLOCK_SIZE == fs->blksz) + 1); |
| if (ext4fs_get_bgdtable() == -1) { |
| printf("Error in getting the block group descriptor table\n"); |
| goto fail; |
| } |
| |
| /* load all the available bitmap block of the partition */ |
| fs->blk_bmaps = zalloc(fs->no_blkgrp * sizeof(char *)); |
| if (!fs->blk_bmaps) |
| goto fail; |
| for (i = 0; i < fs->no_blkgrp; i++) { |
| fs->blk_bmaps[i] = zalloc(fs->blksz); |
| if (!fs->blk_bmaps[i]) |
| goto fail; |
| } |
| |
| for (i = 0; i < fs->no_blkgrp; i++) { |
| struct ext2_block_group *bgd = |
| ext4fs_get_group_descriptor(fs, i); |
| status = ext4fs_devread(ext4fs_bg_get_block_id(bgd, fs) * |
| fs->sect_perblk, 0, |
| fs->blksz, (char *)fs->blk_bmaps[i]); |
| if (status == 0) |
| goto fail; |
| } |
| |
| /* load all the available inode bitmap of the partition */ |
| fs->inode_bmaps = zalloc(fs->no_blkgrp * sizeof(unsigned char *)); |
| if (!fs->inode_bmaps) |
| goto fail; |
| for (i = 0; i < fs->no_blkgrp; i++) { |
| fs->inode_bmaps[i] = zalloc(fs->blksz); |
| if (!fs->inode_bmaps[i]) |
| goto fail; |
| } |
| |
| for (i = 0; i < fs->no_blkgrp; i++) { |
| struct ext2_block_group *bgd = |
| ext4fs_get_group_descriptor(fs, i); |
| status = ext4fs_devread(ext4fs_bg_get_inode_id(bgd, fs) * |
| fs->sect_perblk, |
| 0, fs->blksz, |
| (char *)fs->inode_bmaps[i]); |
| if (status == 0) |
| goto fail; |
| } |
| |
| /* |
| * check filesystem consistency with free blocks of file system |
| * some time we observed that superblock freeblocks does not match |
| * with the blockgroups freeblocks when improper |
| * reboot of a linux kernel |
| */ |
| for (i = 0; i < fs->no_blkgrp; i++) { |
| struct ext2_block_group *bgd = |
| ext4fs_get_group_descriptor(fs, i); |
| real_free_blocks = real_free_blocks + |
| ext4fs_bg_get_free_blocks(bgd, fs); |
| } |
| if (real_free_blocks != ext4fs_sb_get_free_blocks(fs->sb)) |
| ext4fs_sb_set_free_blocks(fs->sb, real_free_blocks); |
| |
| return 0; |
| fail: |
| ext4fs_deinit(); |
| |
| return -1; |
| } |
| |
| void ext4fs_deinit(void) |
| { |
| int i; |
| struct ext2_inode inode_journal; |
| struct journal_superblock_t *jsb; |
| uint32_t blknr; |
| struct ext_filesystem *fs = get_fs(); |
| uint32_t new_feature_incompat; |
| |
| /* free journal */ |
| char *temp_buff = zalloc(fs->blksz); |
| if (temp_buff) { |
| ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO, |
| &inode_journal); |
| blknr = read_allocated_block(&inode_journal, |
| EXT2_JOURNAL_SUPERBLOCK); |
| ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, fs->blksz, |
| temp_buff); |
| jsb = (struct journal_superblock_t *)temp_buff; |
| jsb->s_start = 0; |
| put_ext4((uint64_t) ((uint64_t)blknr * (uint64_t)fs->blksz), |
| (struct journal_superblock_t *)temp_buff, fs->blksz); |
| free(temp_buff); |
| } |
| ext4fs_free_journal(); |
| |
| /* get the superblock */ |
| ext4_read_superblock((char *)fs->sb); |
| new_feature_incompat = le32_to_cpu(fs->sb->feature_incompat); |
| new_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER; |
| fs->sb->feature_incompat = cpu_to_le32(new_feature_incompat); |
| put_ext4((uint64_t)(SUPERBLOCK_SIZE), |
| (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE); |
| free(fs->sb); |
| fs->sb = NULL; |
| |
| if (fs->blk_bmaps) { |
| for (i = 0; i < fs->no_blkgrp; i++) { |
| free(fs->blk_bmaps[i]); |
| fs->blk_bmaps[i] = NULL; |
| } |
| free(fs->blk_bmaps); |
| fs->blk_bmaps = NULL; |
| } |
| |
| if (fs->inode_bmaps) { |
| for (i = 0; i < fs->no_blkgrp; i++) { |
| free(fs->inode_bmaps[i]); |
| fs->inode_bmaps[i] = NULL; |
| } |
| free(fs->inode_bmaps); |
| fs->inode_bmaps = NULL; |
| } |
| |
| |
| free(fs->gdtable); |
| fs->gdtable = NULL; |
| /* |
| * reinitiliazed the global inode and |
| * block bitmap first execution check variables |
| */ |
| fs->first_pass_ibmap = 0; |
| fs->first_pass_bbmap = 0; |
| fs->curr_inode_no = 0; |
| fs->curr_blkno = 0; |
| } |
| |
| /* |
| * Write data to filesystem blocks. Uses same optimization for |
| * contigous sectors as ext4fs_read_file |
| */ |
| static int ext4fs_write_file(struct ext2_inode *file_inode, |
| int pos, unsigned int len, char *buf) |
| { |
| int i; |
| int blockcnt; |
| uint32_t filesize = le32_to_cpu(file_inode->size); |
| struct ext_filesystem *fs = get_fs(); |
| int log2blksz = fs->dev_desc->log2blksz; |
| int log2_fs_blocksize = LOG2_BLOCK_SIZE(ext4fs_root) - log2blksz; |
| int previous_block_number = -1; |
| int delayed_start = 0; |
| int delayed_extent = 0; |
| int delayed_next = 0; |
| char *delayed_buf = NULL; |
| |
| /* Adjust len so it we can't read past the end of the file. */ |
| if (len > filesize) |
| len = filesize; |
| |
| blockcnt = ((len + pos) + fs->blksz - 1) / fs->blksz; |
| |
| for (i = pos / fs->blksz; i < blockcnt; i++) { |
| long int blknr; |
| int blockend = fs->blksz; |
| int skipfirst = 0; |
| blknr = read_allocated_block(file_inode, i); |
| if (blknr <= 0) |
| return -1; |
| |
| blknr = blknr << log2_fs_blocksize; |
| |
| if (blknr) { |
| if (previous_block_number != -1) { |
| if (delayed_next == blknr) { |
| delayed_extent += blockend; |
| delayed_next += blockend >> log2blksz; |
| } else { /* spill */ |
| put_ext4((uint64_t) |
| ((uint64_t)delayed_start << log2blksz), |
| delayed_buf, |
| (uint32_t) delayed_extent); |
| previous_block_number = blknr; |
| delayed_start = blknr; |
| delayed_extent = blockend; |
| delayed_buf = buf; |
| delayed_next = blknr + |
| (blockend >> log2blksz); |
| } |
| } else { |
| previous_block_number = blknr; |
| delayed_start = blknr; |
| delayed_extent = blockend; |
| delayed_buf = buf; |
| delayed_next = blknr + |
| (blockend >> log2blksz); |
| } |
| } else { |
| if (previous_block_number != -1) { |
| /* spill */ |
| put_ext4((uint64_t) ((uint64_t)delayed_start << |
| log2blksz), |
| delayed_buf, |
| (uint32_t) delayed_extent); |
| previous_block_number = -1; |
| } |
| memset(buf, 0, fs->blksz - skipfirst); |
| } |
| buf += fs->blksz - skipfirst; |
| } |
| if (previous_block_number != -1) { |
| /* spill */ |
| put_ext4((uint64_t) ((uint64_t)delayed_start << log2blksz), |
| delayed_buf, (uint32_t) delayed_extent); |
| previous_block_number = -1; |
| } |
| |
| return len; |
| } |
| |
| int ext4fs_write(const char *fname, unsigned char *buffer, |
| unsigned long sizebytes) |
| { |
| int ret = 0; |
| struct ext2_inode *file_inode = NULL; |
| unsigned char *inode_buffer = NULL; |
| int parent_inodeno; |
| int inodeno; |
| time_t timestamp = 0; |
| |
| uint64_t bytes_reqd_for_file; |
| unsigned int blks_reqd_for_file; |
| unsigned int blocks_remaining; |
| int existing_file_inodeno; |
| char *temp_ptr = NULL; |
| long int itable_blkno; |
| long int parent_itable_blkno; |
| long int blkoff; |
| struct ext2_sblock *sblock = &(ext4fs_root->sblock); |
| unsigned int inodes_per_block; |
| unsigned int ibmap_idx; |
| struct ext2_block_group *bgd = NULL; |
| struct ext_filesystem *fs = get_fs(); |
| ALLOC_CACHE_ALIGN_BUFFER(char, filename, 256); |
| memset(filename, 0x00, 256); |
| |
| g_parent_inode = zalloc(fs->inodesz); |
| if (!g_parent_inode) |
| goto fail; |
| |
| if (ext4fs_init() != 0) { |
| printf("error in File System init\n"); |
| return -1; |
| } |
| inodes_per_block = fs->blksz / fs->inodesz; |
| parent_inodeno = ext4fs_get_parent_inode_num(fname, filename, F_FILE); |
| if (parent_inodeno == -1) |
| goto fail; |
| if (ext4fs_iget(parent_inodeno, g_parent_inode)) |
| goto fail; |
| /* do not mess up a directory using hash trees */ |
| if (le32_to_cpu(g_parent_inode->flags) & EXT4_INDEX_FL) { |
| printf("hash tree directory\n"); |
| goto fail; |
| } |
| /* check if the filename is already present in root */ |
| existing_file_inodeno = ext4fs_filename_unlink(filename); |
| if (existing_file_inodeno != -1) { |
| ret = ext4fs_delete_file(existing_file_inodeno); |
| fs->first_pass_bbmap = 0; |
| fs->curr_blkno = 0; |
| |
| fs->first_pass_ibmap = 0; |
| fs->curr_inode_no = 0; |
| if (ret) |
| goto fail; |
| } |
| /* calucalate how many blocks required */ |
| bytes_reqd_for_file = sizebytes; |
| blks_reqd_for_file = lldiv(bytes_reqd_for_file, fs->blksz); |
| if (do_div(bytes_reqd_for_file, fs->blksz) != 0) { |
| blks_reqd_for_file++; |
| debug("total bytes for a file %u\n", blks_reqd_for_file); |
| } |
| blocks_remaining = blks_reqd_for_file; |
| /* test for available space in partition */ |
| if (le32_to_cpu(fs->sb->free_blocks) < blks_reqd_for_file) { |
| printf("Not enough space on partition !!!\n"); |
| goto fail; |
| } |
| |
| inodeno = ext4fs_update_parent_dentry(filename, FILETYPE_REG); |
| if (inodeno == -1) |
| goto fail; |
| /* prepare file inode */ |
| inode_buffer = zalloc(fs->inodesz); |
| if (!inode_buffer) |
| goto fail; |
| file_inode = (struct ext2_inode *)inode_buffer; |
| file_inode->mode = cpu_to_le16(S_IFREG | S_IRWXU | |
| S_IRGRP | S_IROTH | S_IXGRP | S_IXOTH); |
| /* ToDo: Update correct time */ |
| file_inode->mtime = cpu_to_le32(timestamp); |
| file_inode->atime = cpu_to_le32(timestamp); |
| file_inode->ctime = cpu_to_le32(timestamp); |
| file_inode->nlinks = cpu_to_le16(1); |
| file_inode->size = cpu_to_le32(sizebytes); |
| |
| /* Allocate data blocks */ |
| ext4fs_allocate_blocks(file_inode, blocks_remaining, |
| &blks_reqd_for_file); |
| file_inode->blockcnt = cpu_to_le32((blks_reqd_for_file * fs->blksz) >> |
| fs->dev_desc->log2blksz); |
| |
| temp_ptr = zalloc(fs->blksz); |
| if (!temp_ptr) |
| goto fail; |
| ibmap_idx = inodeno / le32_to_cpu(ext4fs_root->sblock.inodes_per_group); |
| inodeno--; |
| bgd = ext4fs_get_group_descriptor(fs, ibmap_idx); |
| itable_blkno = ext4fs_bg_get_inode_table_id(bgd, fs) + |
| (inodeno % le32_to_cpu(sblock->inodes_per_group)) / |
| inodes_per_block; |
| blkoff = (inodeno % inodes_per_block) * fs->inodesz; |
| ext4fs_devread((lbaint_t)itable_blkno * fs->sect_perblk, 0, fs->blksz, |
| temp_ptr); |
| if (ext4fs_log_journal(temp_ptr, itable_blkno)) |
| goto fail; |
| |
| memcpy(temp_ptr + blkoff, inode_buffer, fs->inodesz); |
| if (ext4fs_put_metadata(temp_ptr, itable_blkno)) |
| goto fail; |
| /* copy the file content into data blocks */ |
| if (ext4fs_write_file(file_inode, 0, sizebytes, (char *)buffer) == -1) { |
| printf("Error in copying content\n"); |
| /* FIXME: Deallocate data blocks */ |
| goto fail; |
| } |
| ibmap_idx = parent_inodeno / le32_to_cpu(ext4fs_root->sblock.inodes_per_group); |
| parent_inodeno--; |
| bgd = ext4fs_get_group_descriptor(fs, ibmap_idx); |
| parent_itable_blkno = ext4fs_bg_get_inode_table_id(bgd, fs) + |
| (parent_inodeno % |
| le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; |
| blkoff = (parent_inodeno % inodes_per_block) * fs->inodesz; |
| if (parent_itable_blkno != itable_blkno) { |
| memset(temp_ptr, '\0', fs->blksz); |
| ext4fs_devread((lbaint_t)parent_itable_blkno * fs->sect_perblk, |
| 0, fs->blksz, temp_ptr); |
| if (ext4fs_log_journal(temp_ptr, parent_itable_blkno)) |
| goto fail; |
| |
| memcpy(temp_ptr + blkoff, g_parent_inode, fs->inodesz); |
| if (ext4fs_put_metadata(temp_ptr, parent_itable_blkno)) |
| goto fail; |
| } else { |
| /* |
| * If parent and child fall in same inode table block |
| * both should be kept in 1 buffer |
| */ |
| memcpy(temp_ptr + blkoff, g_parent_inode, fs->inodesz); |
| gd_index--; |
| if (ext4fs_put_metadata(temp_ptr, itable_blkno)) |
| goto fail; |
| } |
| ext4fs_update(); |
| ext4fs_deinit(); |
| |
| fs->first_pass_bbmap = 0; |
| fs->curr_blkno = 0; |
| fs->first_pass_ibmap = 0; |
| fs->curr_inode_no = 0; |
| free(inode_buffer); |
| free(g_parent_inode); |
| free(temp_ptr); |
| g_parent_inode = NULL; |
| |
| return 0; |
| fail: |
| ext4fs_deinit(); |
| free(inode_buffer); |
| free(g_parent_inode); |
| free(temp_ptr); |
| g_parent_inode = NULL; |
| |
| return -1; |
| } |
| |
| int ext4_write_file(const char *filename, void *buf, loff_t offset, |
| loff_t len, loff_t *actwrite) |
| { |
| int ret; |
| |
| if (offset != 0) { |
| printf("** Cannot support non-zero offset **\n"); |
| return -1; |
| } |
| |
| ret = ext4fs_write(filename, buf, len); |
| if (ret) { |
| printf("** Error ext4fs_write() **\n"); |
| goto fail; |
| } |
| |
| *actwrite = len; |
| |
| return 0; |
| |
| fail: |
| *actwrite = 0; |
| |
| return -1; |
| } |
