diff options
Diffstat (limited to 'ext4_common.c')
| -rw-r--r-- | ext4_common.c | 2421 |
1 files changed, 2421 insertions, 0 deletions
diff --git a/ext4_common.c b/ext4_common.c new file mode 100644 index 0000000..5bf78b5 --- /dev/null +++ b/ext4_common.c @@ -0,0 +1,2421 @@ +// 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 load support in Uboot. + * + * (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 <ext_common.h> +#include <ext4fs.h> +#include <malloc.h> +#include <memalign.h> +#include <stddef.h> +#include <linux/stat.h> +#include <linux/time.h> +#include <asm/byteorder.h> +#include "ext4_common.h" + +struct ext2_data *ext4fs_root; +struct ext2fs_node *ext4fs_file; +__le32 *ext4fs_indir1_block; +int ext4fs_indir1_size; +int ext4fs_indir1_blkno = -1; +__le32 *ext4fs_indir2_block; +int ext4fs_indir2_size; +int ext4fs_indir2_blkno = -1; + +__le32 *ext4fs_indir3_block; +int ext4fs_indir3_size; +int ext4fs_indir3_blkno = -1; +struct ext2_inode *g_parent_inode; +static int symlinknest; + +#if defined(CONFIG_EXT4_WRITE) +struct ext2_block_group *ext4fs_get_group_descriptor + (const struct ext_filesystem *fs, uint32_t bg_idx) +{ + return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize)); +} + +static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb) +{ + sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1); +} + +static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb) +{ + uint64_t free_blocks = le32_to_cpu(sb->free_blocks); + free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32; + free_blocks--; + + sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff); + sb->free_blocks_high = cpu_to_le16(free_blocks >> 32); +} + +static inline void ext4fs_bg_free_inodes_dec + (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_dec + (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 inline void ext4fs_bg_itable_unused_dec + (struct ext2_block_group *bg, const struct ext_filesystem *fs) +{ + uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused); + if (fs->gdsize == 64) + free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16; + free_inodes--; + + bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff); + if (fs->gdsize == 64) + bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16); +} + +uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb) +{ + uint64_t free_blocks = le32_to_cpu(sb->free_blocks); + free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32; + return free_blocks; +} + +void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks) +{ + sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff); + sb->free_blocks_high = cpu_to_le16(free_blocks >> 32); +} + +uint32_t ext4fs_bg_get_free_blocks(const 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; + return free_blocks; +} + +static inline +uint32_t ext4fs_bg_get_free_inodes(const 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; + return free_inodes; +} + +static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg) +{ + return le16_to_cpu(bg->bg_flags); +} + +static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg, + uint16_t flags) +{ + bg->bg_flags = cpu_to_le16(flags); +} + +/* Block number of the block bitmap */ +uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg, + const struct ext_filesystem *fs) +{ + uint64_t block_nr = le32_to_cpu(bg->block_id); + if (fs->gdsize == 64) + block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32; + return block_nr; +} + +/* Block number of the inode bitmap */ +uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg, + const struct ext_filesystem *fs) +{ + uint64_t block_nr = le32_to_cpu(bg->inode_id); + if (fs->gdsize == 64) + block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32; + return block_nr; +} +#endif + +/* Block number of the inode table */ +uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg, + const struct ext_filesystem *fs) +{ + uint64_t block_nr = le32_to_cpu(bg->inode_table_id); + if (fs->gdsize == 64) + block_nr += + (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32; + return block_nr; +} + +#if defined(CONFIG_EXT4_WRITE) +uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n) +{ + uint32_t res = size / n; + if (res * n != size) + res++; + + return res; +} + +void put_ext4(uint64_t off, const void *buf, uint32_t size) +{ + uint64_t startblock; + uint64_t remainder; + unsigned char *temp_ptr = NULL; + struct ext_filesystem *fs = get_fs(); + int log2blksz = fs->dev_desc->log2blksz; + ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz); + + startblock = off >> log2blksz; + startblock += part_offset; + remainder = off & (uint64_t)(fs->dev_desc->blksz - 1); + + if (fs->dev_desc == NULL) + return; + + if ((startblock + (size >> log2blksz)) > + (part_offset + fs->total_sect)) { + printf("part_offset is " LBAFU "\n", part_offset); + printf("total_sector is %llu\n", fs->total_sect); + printf("error: overflow occurs\n"); + return; + } + + if (remainder) { + blk_dread(fs->dev_desc, startblock, 1, sec_buf); + temp_ptr = sec_buf; + memcpy((temp_ptr + remainder), (unsigned char *)buf, size); + blk_dwrite(fs->dev_desc, startblock, 1, sec_buf); + } else { + if (size >> log2blksz != 0) { + blk_dwrite(fs->dev_desc, startblock, size >> log2blksz, + (unsigned long *)buf); + } else { + blk_dread(fs->dev_desc, startblock, 1, sec_buf); + temp_ptr = sec_buf; + memcpy(temp_ptr, buf, size); + blk_dwrite(fs->dev_desc, startblock, 1, + (unsigned long *)sec_buf); + } + } +} + +static int _get_new_inode_no(unsigned char *buffer) +{ + struct ext_filesystem *fs = get_fs(); + unsigned char input; + int operand, status; + int count = 1; + int j = 0; + + /* get the blocksize of the filesystem */ + unsigned char *ptr = buffer; + while (*ptr == 255) { + ptr++; + count += 8; + if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group)) + return -1; + } + + for (j = 0; j < fs->blksz; j++) { + input = *ptr; + int i = 0; + while (i <= 7) { + operand = 1 << i; + status = input & operand; + if (status) { + i++; + count++; + } else { + *ptr |= operand; + return count; + } + } + ptr = ptr + 1; + } + + return -1; +} + +static int _get_new_blk_no(unsigned char *buffer) +{ + int operand; + int count = 0; + int i; + unsigned char *ptr = buffer; + struct ext_filesystem *fs = get_fs(); + + while (*ptr == 255) { + ptr++; + count += 8; + if (count == (fs->blksz * 8)) + return -1; + } + + if (fs->blksz == 1024) + count += 1; + + for (i = 0; i <= 7; i++) { + operand = 1 << i; + if (*ptr & operand) { + count++; + } else { + *ptr |= operand; + return count; + } + } + + return -1; +} + +int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index) +{ + int i, remainder, status; + unsigned char *ptr = buffer; + unsigned char operand; + i = blockno / 8; + remainder = blockno % 8; + int blocksize = EXT2_BLOCK_SIZE(ext4fs_root); + + i = i - (index * blocksize); + if (blocksize != 1024) { + ptr = ptr + i; + operand = 1 << remainder; + status = *ptr & operand; + if (status) + return -1; + + *ptr = *ptr | operand; + return 0; + } else { + if (remainder == 0) { + ptr = ptr + i - 1; + operand = (1 << 7); + } else { + ptr = ptr + i; + operand = (1 << (remainder - 1)); + } + status = *ptr & operand; + if (status) + return -1; + + *ptr = *ptr | operand; + return 0; + } +} + +void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index) +{ + int i, remainder, status; + unsigned char *ptr = buffer; + unsigned char operand; + i = blockno / 8; + remainder = blockno % 8; + int blocksize = EXT2_BLOCK_SIZE(ext4fs_root); + + i = i - (index * blocksize); + if (blocksize != 1024) { + ptr = ptr + i; + operand = (1 << remainder); + status = *ptr & operand; + if (status) + *ptr = *ptr & ~(operand); + } else { + if (remainder == 0) { + ptr = ptr + i - 1; + operand = (1 << 7); + } else { + ptr = ptr + i; + operand = (1 << (remainder - 1)); + } + status = *ptr & operand; + if (status) + *ptr = *ptr & ~(operand); + } +} + +int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index) +{ + int i, remainder, status; + unsigned char *ptr = buffer; + unsigned char operand; + + inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group)); + i = inode_no / 8; + remainder = inode_no % 8; + if (remainder == 0) { + ptr = ptr + i - 1; + operand = (1 << 7); + } else { + ptr = ptr + i; + operand = (1 << (remainder - 1)); + } + status = *ptr & operand; + if (status) + return -1; + + *ptr = *ptr | operand; + + return 0; +} + +void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index) +{ + int i, remainder, status; + unsigned char *ptr = buffer; + unsigned char operand; + + inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group)); + i = inode_no / 8; + remainder = inode_no % 8; + if (remainder == 0) { + ptr = ptr + i - 1; + operand = (1 << 7); + } else { + ptr = ptr + i; + operand = (1 << (remainder - 1)); + } + status = *ptr & operand; + if (status) + *ptr = *ptr & ~(operand); +} + +uint16_t ext4fs_checksum_update(uint32_t i) +{ + struct ext2_block_group *desc; + struct ext_filesystem *fs = get_fs(); + uint16_t crc = 0; + __le32 le32_i = cpu_to_le32(i); + + desc = ext4fs_get_group_descriptor(fs, i); + if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) { + int offset = offsetof(struct ext2_block_group, bg_checksum); + + crc = ext2fs_crc16(~0, fs->sb->unique_id, + sizeof(fs->sb->unique_id)); + crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i)); + crc = ext2fs_crc16(crc, desc, offset); + offset += sizeof(desc->bg_checksum); /* skip checksum */ + assert(offset == sizeof(*desc)); + if (offset < fs->gdsize) { + crc = ext2fs_crc16(crc, (__u8 *)desc + offset, + fs->gdsize - offset); + } + } + + return crc; +} + +static int check_void_in_dentry(struct ext2_dirent *dir, char *filename) +{ + int dentry_length; + int sizeof_void_space; + int new_entry_byte_reqd; + short padding_factor = 0; + + if (dir->namelen % 4 != 0) + padding_factor = 4 - (dir->namelen % 4); + + dentry_length = sizeof(struct ext2_dirent) + + dir->namelen + padding_factor; + sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length; + if (sizeof_void_space == 0) + return 0; + + padding_factor = 0; + if (strlen(filename) % 4 != 0) + padding_factor = 4 - (strlen(filename) % 4); + + new_entry_byte_reqd = strlen(filename) + + sizeof(struct ext2_dirent) + padding_factor; + if (sizeof_void_space >= new_entry_byte_reqd) { + dir->direntlen = cpu_to_le16(dentry_length); + return sizeof_void_space; + } + + return 0; +} + +int ext4fs_update_parent_dentry(char *filename, int file_type) +{ + unsigned int *zero_buffer = NULL; + char *root_first_block_buffer = NULL; + int blk_idx; + long int first_block_no_of_root = 0; + int totalbytes = 0; + unsigned int new_entry_byte_reqd; + int sizeof_void_space = 0; + int templength = 0; + int inodeno = -1; + int status; + struct ext_filesystem *fs = get_fs(); + /* directory entry */ + struct ext2_dirent *dir; + char *temp_dir = NULL; + uint32_t new_blk_no; + uint32_t new_size; + uint32_t new_blockcnt; + uint32_t directory_blocks; + + zero_buffer = zalloc(fs->blksz); + if (!zero_buffer) { + printf("No Memory\n"); + return -1; + } + root_first_block_buffer = zalloc(fs->blksz); + if (!root_first_block_buffer) { + free(zero_buffer); + printf("No Memory\n"); + return -1; + } + new_entry_byte_reqd = ROUND(strlen(filename) + + sizeof(struct ext2_dirent), 4); +restart: + directory_blocks = le32_to_cpu(g_parent_inode->size) >> + LOG2_BLOCK_SIZE(ext4fs_root); + blk_idx = directory_blocks - 1; + +restart_read: + /* read the block no allocated to a file */ + first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx, + NULL); + if (first_block_no_of_root <= 0) + goto fail; + + status = ext4fs_devread((lbaint_t)first_block_no_of_root + * fs->sect_perblk, + 0, fs->blksz, root_first_block_buffer); + if (status == 0) + goto fail; + + if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root)) + goto fail; + dir = (struct ext2_dirent *)root_first_block_buffer; + totalbytes = 0; + + while (le16_to_cpu(dir->direntlen) > 0) { + unsigned short used_len = ROUND(dir->namelen + + sizeof(struct ext2_dirent), 4); + + /* last entry of block */ + if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) { + + /* check if new entry fits */ + if ((used_len + new_entry_byte_reqd) <= + le16_to_cpu(dir->direntlen)) { + dir->direntlen = cpu_to_le16(used_len); + break; + } else { + if (blk_idx > 0) { + printf("Block full, trying previous\n"); + blk_idx--; + goto restart_read; + } + printf("All blocks full: Allocate new\n"); + + if (le32_to_cpu(g_parent_inode->flags) & + EXT4_EXTENTS_FL) { + printf("Directory uses extents\n"); + goto fail; + } + if (directory_blocks >= INDIRECT_BLOCKS) { + printf("Directory exceeds limit\n"); + goto fail; + } + new_blk_no = ext4fs_get_new_blk_no(); + if (new_blk_no == -1) { + printf("no block left to assign\n"); + goto fail; + } + put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz); + g_parent_inode->b.blocks. + dir_blocks[directory_blocks] = + cpu_to_le32(new_blk_no); + + new_size = le32_to_cpu(g_parent_inode->size); + new_size += fs->blksz; + g_parent_inode->size = cpu_to_le32(new_size); + + new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt); + new_blockcnt += fs->blksz >> LOG2_SECTOR_SIZE; + g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt); + + if (ext4fs_put_metadata + (root_first_block_buffer, + first_block_no_of_root)) + goto fail; + goto restart; + } + } + + templength = le16_to_cpu(dir->direntlen); + totalbytes = totalbytes + templength; + sizeof_void_space = check_void_in_dentry(dir, filename); + if (sizeof_void_space) + break; + + dir = (struct ext2_dirent *)((char *)dir + templength); + } + + /* make a pointer ready for creating next directory entry */ + templength = le16_to_cpu(dir->direntlen); + totalbytes = totalbytes + templength; + dir = (struct ext2_dirent *)((char *)dir + templength); + + /* get the next available inode number */ + inodeno = ext4fs_get_new_inode_no(); + if (inodeno == -1) { + printf("no inode left to assign\n"); + goto fail; + } + dir->inode = cpu_to_le32(inodeno); + if (sizeof_void_space) + dir->direntlen = cpu_to_le16(sizeof_void_space); + else + dir->direntlen = cpu_to_le16(fs->blksz - totalbytes); + + dir->namelen = strlen(filename); + dir->filetype = file_type; + temp_dir = (char *)dir; + temp_dir = temp_dir + sizeof(struct ext2_dirent); + memcpy(temp_dir, filename, strlen(filename)); + + /* update or write the 1st block of root inode */ + if (ext4fs_put_metadata(root_first_block_buffer, + first_block_no_of_root)) + goto fail; + +fail: + free(zero_buffer); + free(root_first_block_buffer); + + return inodeno; +} + +static int search_dir(struct ext2_inode *parent_inode, char *dirname) +{ + int status; + int inodeno = 0; + int offset; + int blk_idx; + long int blknr; + char *block_buffer = NULL; + struct ext2_dirent *dir = NULL; + struct ext_filesystem *fs = get_fs(); + uint32_t directory_blocks; + char *direntname; + + directory_blocks = le32_to_cpu(parent_inode->size) >> + LOG2_BLOCK_SIZE(ext4fs_root); + + block_buffer = zalloc(fs->blksz); + if (!block_buffer) + goto fail; + + /* get the block no allocated to a file */ + for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) { + blknr = read_allocated_block(parent_inode, blk_idx, NULL); + if (blknr <= 0) + goto fail; + + /* read the directory block */ + status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, + 0, fs->blksz, (char *)block_buffer); + if (status == 0) + goto fail; + + offset = 0; + do { + if (offset & 3) { + printf("Badly aligned ext2_dirent\n"); + break; + } + + dir = (struct ext2_dirent *)(block_buffer + offset); + direntname = (char*)(dir) + sizeof(struct ext2_dirent); + + int direntlen = le16_to_cpu(dir->direntlen); + if (direntlen < sizeof(struct ext2_dirent)) + break; + + if (dir->inode && (strlen(dirname) == dir->namelen) && + (strncmp(dirname, direntname, dir->namelen) == 0)) { + inodeno = le32_to_cpu(dir->inode); + break; + } + + offset += direntlen; + + } while (offset < fs->blksz); + + if (inodeno > 0) { + free(block_buffer); + return inodeno; + } + } + +fail: + free(block_buffer); + + return -1; +} + +static int find_dir_depth(char *dirname) +{ + char *token = strtok(dirname, "/"); + int count = 0; + while (token != NULL) { + token = strtok(NULL, "/"); + count++; + } + return count + 1 + 1; + /* + * for example for string /home/temp + * depth=home(1)+temp(1)+1 extra for NULL; + * so count is 4; + */ +} + +static int parse_path(char **arr, char *dirname) +{ + char *token = strtok(dirname, "/"); + int i = 0; + + /* add root */ + arr[i] = zalloc(strlen("/") + 1); + if (!arr[i]) + return -ENOMEM; + memcpy(arr[i++], "/", strlen("/")); + + /* add each path entry after root */ + while (token != NULL) { + arr[i] = zalloc(strlen(token) + 1); + if (!arr[i]) + return -ENOMEM; + memcpy(arr[i++], token, strlen(token)); + token = strtok(NULL, "/"); + } + arr[i] = NULL; + + return 0; +} + +int ext4fs_iget(int inode_no, struct ext2_inode *inode) +{ + if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0) + return -1; + + return 0; +} + +/* + * Function: ext4fs_get_parent_inode_num + * Return Value: inode Number of the parent directory of file/Directory to be + * created + * dirname : Input parmater, input path name of the file/directory to be created + * dname : Output parameter, to be filled with the name of the directory + * extracted from dirname + */ +int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags) +{ + int i; + int depth = 0; + int matched_inode_no; + int result_inode_no = -1; + char **ptr = NULL; + char *depth_dirname = NULL; + char *parse_dirname = NULL; + struct ext2_inode *parent_inode = NULL; + struct ext2_inode *first_inode = NULL; + struct ext2_inode temp_inode; + + if (*dirname != '/') { + printf("Please supply Absolute path\n"); + return -1; + } + + /* TODO: input validation make equivalent to linux */ + depth_dirname = zalloc(strlen(dirname) + 1); + if (!depth_dirname) + return -ENOMEM; + + memcpy(depth_dirname, dirname, strlen(dirname)); + depth = find_dir_depth(depth_dirname); + parse_dirname = zalloc(strlen(dirname) + 1); + if (!parse_dirname) + goto fail; + memcpy(parse_dirname, dirname, strlen(dirname)); + + /* allocate memory for each directory level */ + ptr = zalloc((depth) * sizeof(char *)); + if (!ptr) + goto fail; + if (parse_path(ptr, parse_dirname)) + goto fail; + parent_inode = zalloc(sizeof(struct ext2_inode)); + if (!parent_inode) + goto fail; + first_inode = zalloc(sizeof(struct ext2_inode)); + if (!first_inode) + goto fail; + memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode)); + memcpy(first_inode, parent_inode, sizeof(struct ext2_inode)); + if (flags & F_FILE) + result_inode_no = EXT2_ROOT_INO; + for (i = 1; i < depth; i++) { + matched_inode_no = search_dir(parent_inode, ptr[i]); + if (matched_inode_no == -1) { + if (ptr[i + 1] == NULL && i == 1) { + result_inode_no = EXT2_ROOT_INO; + goto end; + } else { + if (ptr[i + 1] == NULL) + break; + printf("Invalid path\n"); + result_inode_no = -1; + goto fail; + } + } else { + if (ptr[i + 1] != NULL) { + memset(parent_inode, '\0', + sizeof(struct ext2_inode)); + if (ext4fs_iget(matched_inode_no, + parent_inode)) { + result_inode_no = -1; + goto fail; + } + result_inode_no = matched_inode_no; + } else { + break; + } + } + } + +end: + if (i == 1) + matched_inode_no = search_dir(first_inode, ptr[i]); + else + matched_inode_no = search_dir(parent_inode, ptr[i]); + + if (matched_inode_no != -1) { + ext4fs_iget(matched_inode_no, &temp_inode); + if (le16_to_cpu(temp_inode.mode) & S_IFDIR) { + printf("It is a Directory\n"); + result_inode_no = -1; + goto fail; + } + } + + if (strlen(ptr[i]) > 256) { + result_inode_no = -1; + goto fail; + } + memcpy(dname, ptr[i], strlen(ptr[i])); + +fail: + free(depth_dirname); + free(parse_dirname); + for (i = 0; i < depth; i++) { + if (!ptr[i]) + break; + free(ptr[i]); + } + free(ptr); + free(parent_inode); + free(first_inode); + + return result_inode_no; +} + +static int unlink_filename(char *filename, unsigned int blknr) +{ + int status; + int inodeno = 0; + int offset; + char *block_buffer = NULL; + struct ext2_dirent *dir = NULL; + struct ext2_dirent *previous_dir; + struct ext_filesystem *fs = get_fs(); + int ret = -1; + char *direntname; + + block_buffer = zalloc(fs->blksz); + if (!block_buffer) + return -ENOMEM; + + /* read the directory block */ + status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, + fs->blksz, block_buffer); + if (status == 0) + goto fail; + + offset = 0; + do { + if (offset & 3) { + printf("Badly aligned ext2_dirent\n"); + break; + } + + previous_dir = dir; + dir = (struct ext2_dirent *)(block_buffer + offset); + direntname = (char *)(dir) + sizeof(struct ext2_dirent); + + int direntlen = le16_to_cpu(dir->direntlen); + if (direntlen < sizeof(struct ext2_dirent)) + break; + + if (dir->inode && (strlen(filename) == dir->namelen) && + (strncmp(direntname, filename, dir->namelen) == 0)) { + inodeno = le32_to_cpu(dir->inode); + break; + } + + offset += direntlen; + + } while (offset < fs->blksz); + + if (inodeno > 0) { + printf("file found, deleting\n"); + if (ext4fs_log_journal(block_buffer, blknr)) + goto fail; + + if (previous_dir) { + /* merge dir entry with predecessor */ + uint16_t new_len; + new_len = le16_to_cpu(previous_dir->direntlen); + new_len += le16_to_cpu(dir->direntlen); + previous_dir->direntlen = cpu_to_le16(new_len); + } else { + /* invalidate dir entry */ + dir->inode = 0; + } + if (ext4fs_put_metadata(block_buffer, blknr)) + goto fail; + ret = inodeno; + } +fail: + free(block_buffer); + + return ret; +} + +int ext4fs_filename_unlink(char *filename) +{ + int blk_idx; + long int blknr = -1; + int inodeno = -1; + uint32_t directory_blocks; + + directory_blocks = le32_to_cpu(g_parent_inode->size) >> + LOG2_BLOCK_SIZE(ext4fs_root); + + /* read the block no allocated to a file */ + for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) { + blknr = read_allocated_block(g_parent_inode, blk_idx, NULL); + if (blknr <= 0) + break; + inodeno = unlink_filename(filename, blknr); + if (inodeno != -1) + return inodeno; + } + + return -1; +} + +uint32_t ext4fs_get_new_blk_no(void) +{ + short i; + short status; + int remainder; + unsigned int bg_idx; + static int prev_bg_bitmap_index = -1; + unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); + struct ext_filesystem *fs = get_fs(); + char *journal_buffer = zalloc(fs->blksz); + char *zero_buffer = zalloc(fs->blksz); + if (!journal_buffer || !zero_buffer) + goto fail; + + if (fs->first_pass_bbmap == 0) { + for (i = 0; i < fs->no_blkgrp; i++) { + struct ext2_block_group *bgd = NULL; + bgd = ext4fs_get_group_descriptor(fs, i); + if (ext4fs_bg_get_free_blocks(bgd, fs)) { + uint16_t bg_flags = ext4fs_bg_get_flags(bgd); + uint64_t b_bitmap_blk = + ext4fs_bg_get_block_id(bgd, fs); + if (bg_flags & EXT4_BG_BLOCK_UNINIT) { + memcpy(fs->blk_bmaps[i], zero_buffer, + fs->blksz); + put_ext4(b_bitmap_blk * fs->blksz, + fs->blk_bmaps[i], fs->blksz); + bg_flags &= ~EXT4_BG_BLOCK_UNINIT; + ext4fs_bg_set_flags(bgd, bg_flags); + } + fs->curr_blkno = + _get_new_blk_no(fs->blk_bmaps[i]); + if (fs->curr_blkno == -1) + /* block bitmap is completely filled */ + continue; + fs->curr_blkno = fs->curr_blkno + + (i * fs->blksz * 8); + fs->first_pass_bbmap++; + ext4fs_bg_free_blocks_dec(bgd, fs); + ext4fs_sb_free_blocks_dec(fs->sb); + 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; + goto success; + } else { + debug("no space left on block group %d\n", i); + } + } + + goto fail; + } else { + fs->curr_blkno++; +restart: + /* get the blockbitmap index respective to blockno */ + bg_idx = fs->curr_blkno / blk_per_grp; + if (fs->blksz == 1024) { + remainder = fs->curr_blkno % blk_per_grp; + if (!remainder) + bg_idx--; + } + + /* + * To skip completely filled block group bitmaps + * Optimize the block allocation + */ + if (bg_idx >= fs->no_blkgrp) + goto fail; + + struct ext2_block_group *bgd = NULL; + bgd = ext4fs_get_group_descriptor(fs, bg_idx); + if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) { + debug("block group %u is full. Skipping\n", bg_idx); + fs->curr_blkno = (bg_idx + 1) * blk_per_grp; + if (fs->blksz == 1024) + fs->curr_blkno += 1; + goto restart; + } + + uint16_t bg_flags = ext4fs_bg_get_flags(bgd); + uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs); + if (bg_flags & EXT4_BG_BLOCK_UNINIT) { + memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); + put_ext4(b_bitmap_blk * fs->blksz, + zero_buffer, fs->blksz); + bg_flags &= ~EXT4_BG_BLOCK_UNINIT; + ext4fs_bg_set_flags(bgd, bg_flags); + } + + if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx], + bg_idx) != 0) { + debug("going for restart for the block no %ld %u\n", + fs->curr_blkno, bg_idx); + fs->curr_blkno++; + goto restart; + } + + /* journal backup */ + if (prev_bg_bitmap_index != bg_idx) { + 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_bitmap_index = bg_idx; + } + ext4fs_bg_free_blocks_dec(bgd, fs); + ext4fs_sb_free_blocks_dec(fs->sb); + goto success; + } +success: + free(journal_buffer); + free(zero_buffer); + + return fs->curr_blkno; +fail: + free(journal_buffer); + free(zero_buffer); + + return -1; +} + +int ext4fs_get_new_inode_no(void) +{ + short i; + short status; + unsigned int ibmap_idx; + static int prev_inode_bitmap_index = -1; + unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group); + struct ext_filesystem *fs = get_fs(); + char *journal_buffer = zalloc(fs->blksz); + char *zero_buffer = zalloc(fs->blksz); + if (!journal_buffer || !zero_buffer) + goto fail; + int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) & + EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0; + + if (fs->first_pass_ibmap == 0) { + for (i = 0; i < fs->no_blkgrp; i++) { + uint32_t free_inodes; + struct ext2_block_group *bgd = NULL; + bgd = ext4fs_get_group_descriptor(fs, i); + free_inodes = ext4fs_bg_get_free_inodes(bgd, fs); + if (free_inodes) { + uint16_t bg_flags = ext4fs_bg_get_flags(bgd); + uint64_t i_bitmap_blk = + ext4fs_bg_get_inode_id(bgd, fs); + if (has_gdt_chksum) + bgd->bg_itable_unused = free_inodes; + if (bg_flags & EXT4_BG_INODE_UNINIT) { + put_ext4(i_bitmap_blk * fs->blksz, + zero_buffer, fs->blksz); + bg_flags &= ~EXT4_BG_INODE_UNINIT; + ext4fs_bg_set_flags(bgd, bg_flags); + memcpy(fs->inode_bmaps[i], + zero_buffer, fs->blksz); + } + fs->curr_inode_no = + _get_new_inode_no(fs->inode_bmaps[i]); + if (fs->curr_inode_no == -1) + /* inode bitmap is completely filled */ + continue; + fs->curr_inode_no = fs->curr_inode_no + + (i * inodes_per_grp); + fs->first_pass_ibmap++; + ext4fs_bg_free_inodes_dec(bgd, fs); + if (has_gdt_chksum) + ext4fs_bg_itable_unused_dec(bgd, fs); + ext4fs_sb_free_inodes_dec(fs->sb); + status = ext4fs_devread(i_bitmap_blk * + fs->sect_perblk, + 0, fs->blksz, + journal_buffer); + if (status == 0) + goto fail; + if (ext4fs_log_journal(journal_buffer, + i_bitmap_blk)) + goto fail; + goto success; + } else + debug("no inode left on block group %d\n", i); + } + goto fail; + } else { +restart: + fs->curr_inode_no++; + /* get the blockbitmap index respective to blockno */ + ibmap_idx = fs->curr_inode_no / inodes_per_grp; + struct ext2_block_group *bgd = + ext4fs_get_group_descriptor(fs, ibmap_idx); + uint16_t bg_flags = ext4fs_bg_get_flags(bgd); + uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs); + + if (bg_flags & EXT4_BG_INODE_UNINIT) { + put_ext4(i_bitmap_blk * fs->blksz, + zero_buffer, fs->blksz); + bg_flags &= ~EXT4_BG_INODE_UNINIT; + ext4fs_bg_set_flags(bgd, bg_flags); + memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, + fs->blksz); + } + + if (ext4fs_set_inode_bmap(fs->curr_inode_no, + fs->inode_bmaps[ibmap_idx], + ibmap_idx) != 0) { + debug("going for restart for the block no %d %u\n", + fs->curr_inode_no, ibmap_idx); + goto restart; + } + + /* journal backup */ + if (prev_inode_bitmap_index != ibmap_idx) { + status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk, + 0, fs->blksz, journal_buffer); + if (status == 0) + goto fail; + if (ext4fs_log_journal(journal_buffer, + le32_to_cpu(bgd->inode_id))) + goto fail; + prev_inode_bitmap_index = ibmap_idx; + } + ext4fs_bg_free_inodes_dec(bgd, fs); + if (has_gdt_chksum) + bgd->bg_itable_unused = bgd->free_inodes; + ext4fs_sb_free_inodes_dec(fs->sb); + goto success; + } + +success: + free(journal_buffer); + free(zero_buffer); + + return fs->curr_inode_no; +fail: + free(journal_buffer); + free(zero_buffer); + + return -1; + +} + + +static void alloc_single_indirect_block(struct ext2_inode *file_inode, + unsigned int *total_remaining_blocks, + unsigned int *no_blks_reqd) +{ + short i; + short status; + long int actual_block_no; + long int si_blockno; + /* si :single indirect */ + __le32 *si_buffer = NULL; + __le32 *si_start_addr = NULL; + struct ext_filesystem *fs = get_fs(); + + if (*total_remaining_blocks != 0) { + si_buffer = zalloc(fs->blksz); + if (!si_buffer) { + printf("No Memory\n"); + return; + } + si_start_addr = si_buffer; + si_blockno = ext4fs_get_new_blk_no(); + if (si_blockno == -1) { + printf("no block left to assign\n"); + goto fail; + } + (*no_blks_reqd)++; + debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks); + + status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk, + 0, fs->blksz, (char *)si_buffer); + memset(si_buffer, '\0', fs->blksz); + if (status == 0) + goto fail; + + for (i = 0; i < (fs->blksz / sizeof(int)); i++) { + actual_block_no = ext4fs_get_new_blk_no(); + if (actual_block_no == -1) { + printf("no block left to assign\n"); + goto fail; + } + *si_buffer = cpu_to_le32(actual_block_no); + debug("SIAB %u: %u\n", *si_buffer, + *total_remaining_blocks); + + si_buffer++; + (*total_remaining_blocks)--; + if (*total_remaining_blocks == 0) + break; + } + + /* write the block to disk */ + put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)), + si_start_addr, fs->blksz); + file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno); + } +fail: + free(si_start_addr); +} + +static void alloc_double_indirect_block(struct ext2_inode *file_inode, + unsigned int *total_remaining_blocks, + unsigned int *no_blks_reqd) +{ + short i; + short j; + short status; + long int actual_block_no; + /* di:double indirect */ + long int di_blockno_parent; + long int di_blockno_child; + __le32 *di_parent_buffer = NULL; + __le32 *di_child_buff = NULL; + __le32 *di_block_start_addr = NULL; + __le32 *di_child_buff_start = NULL; + struct ext_filesystem *fs = get_fs(); + + if (*total_remaining_blocks != 0) { + /* double indirect parent block connecting to inode */ + di_blockno_parent = ext4fs_get_new_blk_no(); + if (di_blockno_parent == -1) { + printf("no block left to assign\n"); + goto fail; + } + di_parent_buffer = zalloc(fs->blksz); + if (!di_parent_buffer) + goto fail; + + di_block_start_addr = di_parent_buffer; + (*no_blks_reqd)++; + debug("DIPB %ld: %u\n", di_blockno_parent, + *total_remaining_blocks); + + status = ext4fs_devread((lbaint_t)di_blockno_parent * + fs->sect_perblk, 0, + fs->blksz, (char *)di_parent_buffer); + + if (!status) { + printf("%s: Device read error!\n", __func__); + goto fail; + } + memset(di_parent_buffer, '\0', fs->blksz); + + /* + * start:for each double indirect parent + * block create one more block + */ + for (i = 0; i < (fs->blksz / sizeof(int)); i++) { + di_blockno_child = ext4fs_get_new_blk_no(); + if (di_blockno_child == -1) { + printf("no block left to assign\n"); + goto fail; + } + di_child_buff = zalloc(fs->blksz); + if (!di_child_buff) + goto fail; + + di_child_buff_start = di_child_buff; + *di_parent_buffer = cpu_to_le32(di_blockno_child); + di_parent_buffer++; + (*no_blks_reqd)++; + debug("DICB %ld: %u\n", di_blockno_child, + *total_remaining_blocks); + + status = ext4fs_devread((lbaint_t)di_blockno_child * + fs->sect_perblk, 0, + fs->blksz, + (char *)di_child_buff); + + if (!status) { + printf("%s: Device read error!\n", __func__); + goto fail; + } + memset(di_child_buff, '\0', fs->blksz); + /* filling of actual datablocks for each child */ + for (j = 0; j < (fs->blksz / sizeof(int)); j++) { + actual_block_no = ext4fs_get_new_blk_no(); + if (actual_block_no == -1) { + printf("no block left to assign\n"); + goto fail; + } + *di_child_buff = cpu_to_le32(actual_block_no); + debug("DIAB %ld: %u\n", actual_block_no, + *total_remaining_blocks); + + di_child_buff++; + (*total_remaining_blocks)--; + if (*total_remaining_blocks == 0) + break; + } + /* write the block table */ + put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)), + di_child_buff_start, fs->blksz); + free(di_child_buff_start); + di_child_buff_start = NULL; + + if (*total_remaining_blocks == 0) + break; + } + put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)), + di_block_start_addr, fs->blksz); + file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent); + } +fail: + free(di_block_start_addr); +} + +static void alloc_triple_indirect_block(struct ext2_inode *file_inode, + unsigned int *total_remaining_blocks, + unsigned int *no_blks_reqd) +{ + short i; + short j; + short k; + long int actual_block_no; + /* ti: Triple Indirect */ + long int ti_gp_blockno; + long int ti_parent_blockno; + long int ti_child_blockno; + __le32 *ti_gp_buff = NULL; + __le32 *ti_parent_buff = NULL; + __le32 *ti_child_buff = NULL; + __le32 *ti_gp_buff_start_addr = NULL; + __le32 *ti_pbuff_start_addr = NULL; + __le32 *ti_cbuff_start_addr = NULL; + struct ext_filesystem *fs = get_fs(); + if (*total_remaining_blocks != 0) { + /* triple indirect grand parent block connecting to inode */ + ti_gp_blockno = ext4fs_get_new_blk_no(); + if (ti_gp_blockno == -1) { + printf("no block left to assign\n"); + return; + } + ti_gp_buff = zalloc(fs->blksz); + if (!ti_gp_buff) + return; + + ti_gp_buff_start_addr = ti_gp_buff; + (*no_blks_reqd)++; + debug("TIGPB %ld: %u\n", ti_gp_blockno, + *total_remaining_blocks); + + /* for each 4 byte grand parent entry create one more block */ + for (i = 0; i < (fs->blksz / sizeof(int)); i++) { + ti_parent_blockno = ext4fs_get_new_blk_no(); + if (ti_parent_blockno == -1) { + printf("no block left to assign\n"); + goto fail; + } + ti_parent_buff = zalloc(fs->blksz); + if (!ti_parent_buff) + goto fail; + + ti_pbuff_start_addr = ti_parent_buff; + *ti_gp_buff = cpu_to_le32(ti_parent_blockno); + ti_gp_buff++; + (*no_blks_reqd)++; + debug("TIPB %ld: %u\n", ti_parent_blockno, + *total_remaining_blocks); + + /* for each 4 byte entry parent create one more block */ + for (j = 0; j < (fs->blksz / sizeof(int)); j++) { + ti_child_blockno = ext4fs_get_new_blk_no(); + if (ti_child_blockno == -1) { + printf("no block left assign\n"); + goto fail1; + } + ti_child_buff = zalloc(fs->blksz); + if (!ti_child_buff) + goto fail1; + + ti_cbuff_start_addr = ti_child_buff; + *ti_parent_buff = cpu_to_le32(ti_child_blockno); + ti_parent_buff++; + (*no_blks_reqd)++; + debug("TICB %ld: %u\n", ti_parent_blockno, + *total_remaining_blocks); + + /* fill actual datablocks for each child */ + for (k = 0; k < (fs->blksz / sizeof(int)); + k++) { + actual_block_no = + ext4fs_get_new_blk_no(); + if (actual_block_no == -1) { + printf("no block left\n"); + free(ti_cbuff_start_addr); + goto fail1; + } + *ti_child_buff = cpu_to_le32(actual_block_no); + debug("TIAB %ld: %u\n", actual_block_no, + *total_remaining_blocks); + + ti_child_buff++; + (*total_remaining_blocks)--; + if (*total_remaining_blocks == 0) + break; + } + /* write the child block */ + put_ext4(((uint64_t) ((uint64_t)ti_child_blockno * + (uint64_t)fs->blksz)), + ti_cbuff_start_addr, fs->blksz); + free(ti_cbuff_start_addr); + + if (*total_remaining_blocks == 0) + break; + } + /* write the parent block */ + put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)), + ti_pbuff_start_addr, fs->blksz); + free(ti_pbuff_start_addr); + + if (*total_remaining_blocks == 0) + break; + } + /* write the grand parent block */ + put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)), + ti_gp_buff_start_addr, fs->blksz); + file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno); + free(ti_gp_buff_start_addr); + return; + } +fail1: + free(ti_pbuff_start_addr); +fail: + free(ti_gp_buff_start_addr); +} + +void ext4fs_allocate_blocks(struct ext2_inode *file_inode, + unsigned int total_remaining_blocks, + unsigned int *total_no_of_block) +{ + short i; + long int direct_blockno; + unsigned int no_blks_reqd = 0; + + /* allocation of direct blocks */ + for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) { + direct_blockno = ext4fs_get_new_blk_no(); + if (direct_blockno == -1) { + printf("no block left to assign\n"); + return; + } + file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno); + debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks); + + total_remaining_blocks--; + } + + alloc_single_indirect_block(file_inode, &total_remaining_blocks, + &no_blks_reqd); + alloc_double_indirect_block(file_inode, &total_remaining_blocks, + &no_blks_reqd); + alloc_triple_indirect_block(file_inode, &total_remaining_blocks, + &no_blks_reqd); + *total_no_of_block += no_blks_reqd; +} + +#endif + +static struct ext4_extent_header *ext4fs_get_extent_block + (struct ext2_data *data, struct ext_block_cache *cache, + struct ext4_extent_header *ext_block, + uint32_t fileblock, int log2_blksz) +{ + struct ext4_extent_idx *index; + unsigned long long block; + int blksz = EXT2_BLOCK_SIZE(data); + int i; + + while (1) { + index = (struct ext4_extent_idx *)(ext_block + 1); + + if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) + return NULL; + + if (ext_block->eh_depth == 0) + return ext_block; + i = -1; + do { + i++; + if (i >= le16_to_cpu(ext_block->eh_entries)) + break; + } while (fileblock >= le32_to_cpu(index[i].ei_block)); + + /* + * If first logical block number is higher than requested fileblock, + * it is a sparse file. This is handled on upper layer. + */ + if (i > 0) + i--; + + block = le16_to_cpu(index[i].ei_leaf_hi); + block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); + block <<= log2_blksz; + if (!ext_cache_read(cache, (lbaint_t)block, blksz)) + return NULL; + ext_block = (struct ext4_extent_header *)cache->buf; + } +} + +static int ext4fs_blockgroup + (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) +{ + long int blkno; + unsigned int blkoff, desc_per_blk; + int log2blksz = get_fs()->dev_desc->log2blksz; + int desc_size = get_fs()->gdsize; + + if (desc_size == 0) + return 0; + desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size; + + if (desc_per_blk == 0) + return 0; + blkno = le32_to_cpu(data->sblock.first_data_block) + 1 + + group / desc_per_blk; + blkoff = (group % desc_per_blk) * desc_size; + + debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", + group, blkno, blkoff); + + return ext4fs_devread((lbaint_t)blkno << + (LOG2_BLOCK_SIZE(data) - log2blksz), + blkoff, desc_size, (char *)blkgrp); +} + +int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) +{ + struct ext2_block_group *blkgrp; + struct ext2_sblock *sblock = &data->sblock; + struct ext_filesystem *fs = get_fs(); + int log2blksz = get_fs()->dev_desc->log2blksz; + int inodes_per_block, status; + long int blkno; + unsigned int blkoff; + + /* Allocate blkgrp based on gdsize (for 64-bit support). */ + blkgrp = zalloc(get_fs()->gdsize); + if (!blkgrp) + return 0; + + /* It is easier to calculate if the first inode is 0. */ + ino--; + if ( le32_to_cpu(sblock->inodes_per_group) == 0 || fs->inodesz == 0) { + free(blkgrp); + return 0; + } + status = ext4fs_blockgroup(data, ino / le32_to_cpu + (sblock->inodes_per_group), blkgrp); + if (status == 0) { + free(blkgrp); + return 0; + } + + inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; + if ( inodes_per_block == 0 ) { + free(blkgrp); + return 0; + } + blkno = ext4fs_bg_get_inode_table_id(blkgrp, fs) + + (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; + blkoff = (ino % inodes_per_block) * fs->inodesz; + + /* Free blkgrp as it is no longer required. */ + free(blkgrp); + + /* Read the inode. */ + status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) - + log2blksz), blkoff, + sizeof(struct ext2_inode), (char *)inode); + if (status == 0) + return 0; + + return 1; +} + +long int read_allocated_block(struct ext2_inode *inode, int fileblock, + struct ext_block_cache *cache) +{ + long int blknr; + int blksz; + int log2_blksz; + int status; + long int rblock; + long int perblock_parent; + long int perblock_child; + unsigned long long start; + /* get the blocksize of the filesystem */ + blksz = EXT2_BLOCK_SIZE(ext4fs_root); + log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root) + - get_fs()->dev_desc->log2blksz; + + if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { + long int startblock, endblock; + struct ext_block_cache *c, cd; + struct ext4_extent_header *ext_block; + struct ext4_extent *extent; + int i; + + if (cache) { + c = cache; + } else { + c = &cd; + ext_cache_init(c); + } + ext_block = + ext4fs_get_extent_block(ext4fs_root, c, + (struct ext4_extent_header *) + inode->b.blocks.dir_blocks, + fileblock, log2_blksz); + if (!ext_block) { + printf("invalid extent block\n"); + if (!cache) + ext_cache_fini(c); + return -EINVAL; + } + + extent = (struct ext4_extent *)(ext_block + 1); + + for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) { + startblock = le32_to_cpu(extent[i].ee_block); + endblock = startblock + le16_to_cpu(extent[i].ee_len); + + if (startblock > fileblock) { + /* Sparse file */ + if (!cache) + ext_cache_fini(c); + return 0; + + } else if (fileblock < endblock) { + start = le16_to_cpu(extent[i].ee_start_hi); + start = (start << 32) + + le32_to_cpu(extent[i].ee_start_lo); + if (!cache) + ext_cache_fini(c); + return (fileblock - startblock) + start; + } + } + + if (!cache) + ext_cache_fini(c); + return 0; + } + + /* Direct blocks. */ + if (fileblock < INDIRECT_BLOCKS) + blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]); + + /* Indirect. */ + else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) { + if (ext4fs_indir1_block == NULL) { + ext4fs_indir1_block = zalloc(blksz); + if (ext4fs_indir1_block == NULL) { + printf("** SI ext2fs read block (indir 1)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir1_size = blksz; + ext4fs_indir1_blkno = -1; + } + if (blksz != ext4fs_indir1_size) { + free(ext4fs_indir1_block); + ext4fs_indir1_block = NULL; + ext4fs_indir1_size = 0; + ext4fs_indir1_blkno = -1; + ext4fs_indir1_block = zalloc(blksz); + if (ext4fs_indir1_block == NULL) { + printf("** SI ext2fs read block (indir 1):" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir1_size = blksz; + } + if ((le32_to_cpu(inode->b.blocks.indir_block) << + log2_blksz) != ext4fs_indir1_blkno) { + status = + ext4fs_devread((lbaint_t)le32_to_cpu + (inode->b.blocks. + indir_block) << log2_blksz, 0, + blksz, (char *)ext4fs_indir1_block); + if (status == 0) { + printf("** SI ext2fs read block (indir 1)" + "failed. **\n"); + return -1; + } + ext4fs_indir1_blkno = + le32_to_cpu(inode->b.blocks. + indir_block) << log2_blksz; + } + blknr = le32_to_cpu(ext4fs_indir1_block + [fileblock - INDIRECT_BLOCKS]); + } + /* Double indirect. */ + else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * + (blksz / 4 + 1)))) { + + long int perblock = blksz / 4; + long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); + + if (ext4fs_indir1_block == NULL) { + ext4fs_indir1_block = zalloc(blksz); + if (ext4fs_indir1_block == NULL) { + printf("** DI ext2fs read block (indir 2 1)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir1_size = blksz; + ext4fs_indir1_blkno = -1; + } + if (blksz != ext4fs_indir1_size) { + free(ext4fs_indir1_block); + ext4fs_indir1_block = NULL; + ext4fs_indir1_size = 0; + ext4fs_indir1_blkno = -1; + ext4fs_indir1_block = zalloc(blksz); + if (ext4fs_indir1_block == NULL) { + printf("** DI ext2fs read block (indir 2 1)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir1_size = blksz; + } + if ((le32_to_cpu(inode->b.blocks.double_indir_block) << + log2_blksz) != ext4fs_indir1_blkno) { + status = + ext4fs_devread((lbaint_t)le32_to_cpu + (inode->b.blocks. + double_indir_block) << log2_blksz, + 0, blksz, + (char *)ext4fs_indir1_block); + if (status == 0) { + printf("** DI ext2fs read block (indir 2 1)" + "failed. **\n"); + return -1; + } + ext4fs_indir1_blkno = + le32_to_cpu(inode->b.blocks.double_indir_block) << + log2_blksz; + } + + if (ext4fs_indir2_block == NULL) { + ext4fs_indir2_block = zalloc(blksz); + if (ext4fs_indir2_block == NULL) { + printf("** DI ext2fs read block (indir 2 2)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir2_size = blksz; + ext4fs_indir2_blkno = -1; + } + if (blksz != ext4fs_indir2_size) { + free(ext4fs_indir2_block); + ext4fs_indir2_block = NULL; + ext4fs_indir2_size = 0; + ext4fs_indir2_blkno = -1; + ext4fs_indir2_block = zalloc(blksz); + if (ext4fs_indir2_block == NULL) { + printf("** DI ext2fs read block (indir 2 2)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir2_size = blksz; + } + if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << + log2_blksz) != ext4fs_indir2_blkno) { + status = ext4fs_devread((lbaint_t)le32_to_cpu + (ext4fs_indir1_block + [rblock / + perblock]) << log2_blksz, 0, + blksz, + (char *)ext4fs_indir2_block); + if (status == 0) { + printf("** DI ext2fs read block (indir 2 2)" + "failed. **\n"); + return -1; + } + ext4fs_indir2_blkno = + le32_to_cpu(ext4fs_indir1_block[rblock + / + perblock]) << + log2_blksz; + } + blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); + } + /* Tripple indirect. */ + else { + rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + + (blksz / 4 * blksz / 4)); + perblock_child = blksz / 4; + perblock_parent = ((blksz / 4) * (blksz / 4)); + + if (ext4fs_indir1_block == NULL) { + ext4fs_indir1_block = zalloc(blksz); + if (ext4fs_indir1_block == NULL) { + printf("** TI ext2fs read block (indir 2 1)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir1_size = blksz; + ext4fs_indir1_blkno = -1; + } + if (blksz != ext4fs_indir1_size) { + free(ext4fs_indir1_block); + ext4fs_indir1_block = NULL; + ext4fs_indir1_size = 0; + ext4fs_indir1_blkno = -1; + ext4fs_indir1_block = zalloc(blksz); + if (ext4fs_indir1_block == NULL) { + printf("** TI ext2fs read block (indir 2 1)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir1_size = blksz; + } + if ((le32_to_cpu(inode->b.blocks.triple_indir_block) << + log2_blksz) != ext4fs_indir1_blkno) { + status = ext4fs_devread + ((lbaint_t) + le32_to_cpu(inode->b.blocks.triple_indir_block) + << log2_blksz, 0, blksz, + (char *)ext4fs_indir1_block); + if (status == 0) { + printf("** TI ext2fs read block (indir 2 1)" + "failed. **\n"); + return -1; + } + ext4fs_indir1_blkno = + le32_to_cpu(inode->b.blocks.triple_indir_block) << + log2_blksz; + } + + if (ext4fs_indir2_block == NULL) { + ext4fs_indir2_block = zalloc(blksz); + if (ext4fs_indir2_block == NULL) { + printf("** TI ext2fs read block (indir 2 2)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir2_size = blksz; + ext4fs_indir2_blkno = -1; + } + if (blksz != ext4fs_indir2_size) { + free(ext4fs_indir2_block); + ext4fs_indir2_block = NULL; + ext4fs_indir2_size = 0; + ext4fs_indir2_blkno = -1; + ext4fs_indir2_block = zalloc(blksz); + if (ext4fs_indir2_block == NULL) { + printf("** TI ext2fs read block (indir 2 2)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir2_size = blksz; + } + if ((le32_to_cpu(ext4fs_indir1_block[rblock / + perblock_parent]) << + log2_blksz) + != ext4fs_indir2_blkno) { + status = ext4fs_devread((lbaint_t)le32_to_cpu + (ext4fs_indir1_block + [rblock / + perblock_parent]) << + log2_blksz, 0, blksz, + (char *)ext4fs_indir2_block); + if (status == 0) { + printf("** TI ext2fs read block (indir 2 2)" + "failed. **\n"); + return -1; + } + ext4fs_indir2_blkno = + le32_to_cpu(ext4fs_indir1_block[rblock / + perblock_parent]) + << log2_blksz; + } + + if (ext4fs_indir3_block == NULL) { + ext4fs_indir3_block = zalloc(blksz); + if (ext4fs_indir3_block == NULL) { + printf("** TI ext2fs read block (indir 2 2)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir3_size = blksz; + ext4fs_indir3_blkno = -1; + } + if (blksz != ext4fs_indir3_size) { + free(ext4fs_indir3_block); + ext4fs_indir3_block = NULL; + ext4fs_indir3_size = 0; + ext4fs_indir3_blkno = -1; + ext4fs_indir3_block = zalloc(blksz); + if (ext4fs_indir3_block == NULL) { + printf("** TI ext2fs read block (indir 2 2)" + "malloc failed. **\n"); + return -1; + } + ext4fs_indir3_size = blksz; + } + if ((le32_to_cpu(ext4fs_indir2_block[rblock + / + perblock_child]) << + log2_blksz) != ext4fs_indir3_blkno) { + status = + ext4fs_devread((lbaint_t)le32_to_cpu + (ext4fs_indir2_block + [(rblock / perblock_child) + % (blksz / 4)]) << log2_blksz, 0, + blksz, (char *)ext4fs_indir3_block); + if (status == 0) { + printf("** TI ext2fs read block (indir 2 2)" + "failed. **\n"); + return -1; + } + ext4fs_indir3_blkno = + le32_to_cpu(ext4fs_indir2_block[(rblock / + perblock_child) % + (blksz / + 4)]) << + log2_blksz; + } + + blknr = le32_to_cpu(ext4fs_indir3_block + [rblock % perblock_child]); + } + debug("read_allocated_block %ld\n", blknr); + + return blknr; +} + +/** + * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's + * global pointers + * + * This function assures that for a file with the same name but different size + * the sequential store on the ext4 filesystem will be correct. + * + * In this function the global data, responsible for internal representation + * of the ext4 data are initialized to the reset state. Without this, during + * replacement of the smaller file with the bigger truncation of new file was + * performed. + */ +void ext4fs_reinit_global(void) +{ + if (ext4fs_indir1_block != NULL) { + free(ext4fs_indir1_block); + ext4fs_indir1_block = NULL; + ext4fs_indir1_size = 0; + ext4fs_indir1_blkno = -1; + } + if (ext4fs_indir2_block != NULL) { + free(ext4fs_indir2_block); + ext4fs_indir2_block = NULL; + ext4fs_indir2_size = 0; + ext4fs_indir2_blkno = -1; + } + if (ext4fs_indir3_block != NULL) { + free(ext4fs_indir3_block); + ext4fs_indir3_block = NULL; + ext4fs_indir3_size = 0; + ext4fs_indir3_blkno = -1; + } +} +void ext4fs_close(void) +{ + if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { + ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); + ext4fs_file = NULL; + } + if (ext4fs_root != NULL) { + free(ext4fs_root); + ext4fs_root = NULL; + } + + ext4fs_reinit_global(); +} + +int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, + struct ext2fs_node **fnode, int *ftype) +{ + unsigned int fpos = 0; + int status; + loff_t actread; + struct ext2fs_node *diro = (struct ext2fs_node *) dir; + +#ifdef DEBUG + if (name != NULL) + printf("Iterate dir %s\n", name); +#endif /* of DEBUG */ + if (!diro->inode_read) { + status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); + if (status == 0) + return 0; + } + /* Search the file. */ + while (fpos < le32_to_cpu(diro->inode.size)) { + struct ext2_dirent dirent; + + status = ext4fs_read_file(diro, fpos, + sizeof(struct ext2_dirent), + (char *)&dirent, &actread); + if (status < 0) + return 0; + + if (dirent.direntlen == 0) { + printf("Failed to iterate over directory %s\n", name); + return 0; + } + + if (dirent.namelen != 0) { + char filename[dirent.namelen + 1]; + struct ext2fs_node *fdiro; + int type = FILETYPE_UNKNOWN; + + status = ext4fs_read_file(diro, + fpos + + sizeof(struct ext2_dirent), + dirent.namelen, filename, + &actread); + if (status < 0) + return 0; + + fdiro = zalloc(sizeof(struct ext2fs_node)); + if (!fdiro) + return 0; + + fdiro->data = diro->data; + fdiro->ino = le32_to_cpu(dirent.inode); + + filename[dirent.namelen] = '\0'; + + if (dirent.filetype != FILETYPE_UNKNOWN) { + fdiro->inode_read = 0; + + if (dirent.filetype == FILETYPE_DIRECTORY) + type = FILETYPE_DIRECTORY; + else if (dirent.filetype == FILETYPE_SYMLINK) + type = FILETYPE_SYMLINK; + else if (dirent.filetype == FILETYPE_REG) + type = FILETYPE_REG; + } else { + status = ext4fs_read_inode(diro->data, + le32_to_cpu + (dirent.inode), + &fdiro->inode); + if (status == 0) { + free(fdiro); + return 0; + } + fdiro->inode_read = 1; + + if ((le16_to_cpu(fdiro->inode.mode) & + FILETYPE_INO_MASK) == + FILETYPE_INO_DIRECTORY) { + type = FILETYPE_DIRECTORY; + } else if ((le16_to_cpu(fdiro->inode.mode) + & FILETYPE_INO_MASK) == + FILETYPE_INO_SYMLINK) { + type = FILETYPE_SYMLINK; + } else if ((le16_to_cpu(fdiro->inode.mode) + & FILETYPE_INO_MASK) == + FILETYPE_INO_REG) { + type = FILETYPE_REG; + } + } +#ifdef DEBUG + printf("iterate >%s<\n", filename); +#endif /* of DEBUG */ + if ((name != NULL) && (fnode != NULL) + && (ftype != NULL)) { + if (strcmp(filename, name) == 0) { + *ftype = type; + *fnode = fdiro; + return 1; + } + } else { + if (fdiro->inode_read == 0) { + status = ext4fs_read_inode(diro->data, + le32_to_cpu( + dirent.inode), + &fdiro->inode); + if (status == 0) { + free(fdiro); + return 0; + } + fdiro->inode_read = 1; + } + switch (type) { + case FILETYPE_DIRECTORY: + printf("<DIR> "); + break; + case FILETYPE_SYMLINK: + printf("<SYM> "); + break; + case FILETYPE_REG: + printf(" "); + break; + default: + printf("< ? > "); + break; + } + printf("%10u %s\n", + le32_to_cpu(fdiro->inode.size), + filename); + } + free(fdiro); + } + fpos += le16_to_cpu(dirent.direntlen); + } + return 0; +} + +static char *ext4fs_read_symlink(struct ext2fs_node *node) +{ + char *symlink; + struct ext2fs_node *diro = node; + int status; + loff_t actread; + + if (!diro->inode_read) { + status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); + if (status == 0) + return NULL; + } + symlink = zalloc(le32_to_cpu(diro->inode.size) + 1); + if (!symlink) + return NULL; + + if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) { + strncpy(symlink, diro->inode.b.symlink, + le32_to_cpu(diro->inode.size)); + } else { + status = ext4fs_read_file(diro, 0, + le32_to_cpu(diro->inode.size), + symlink, &actread); + if ((status < 0) || (actread == 0)) { + free(symlink); + return NULL; + } + } + symlink[le32_to_cpu(diro->inode.size)] = '\0'; + return symlink; +} + +static int ext4fs_find_file1(const char *currpath, + struct ext2fs_node *currroot, + struct ext2fs_node **currfound, int *foundtype) +{ + char fpath[strlen(currpath) + 1]; + char *name = fpath; + char *next; + int status; + int type = FILETYPE_DIRECTORY; + struct ext2fs_node *currnode = currroot; + struct ext2fs_node *oldnode = currroot; + + strncpy(fpath, currpath, strlen(currpath) + 1); + + /* Remove all leading slashes. */ + while (*name == '/') + name++; + + if (!*name) { + *currfound = currnode; + return 1; + } + + for (;;) { + int found; + + /* Extract the actual part from the pathname. */ + next = strchr(name, '/'); + if (next) { + /* Remove all leading slashes. */ + while (*next == '/') + *(next++) = '\0'; + } + + if (type != FILETYPE_DIRECTORY) { + ext4fs_free_node(currnode, currroot); + return 0; + } + + oldnode = currnode; + + /* Iterate over the directory. */ + found = ext4fs_iterate_dir(currnode, name, &currnode, &type); + if (found == 0) + return 0; + + if (found == -1) + break; + + /* Read in the symlink and follow it. */ + if (type == FILETYPE_SYMLINK) { + char *symlink; + + /* Test if the symlink does not loop. */ + if (++symlinknest == 8) { + ext4fs_free_node(currnode, currroot); + ext4fs_free_node(oldnode, currroot); + return 0; + } + + symlink = ext4fs_read_symlink(currnode); + ext4fs_free_node(currnode, currroot); + + if (!symlink) { + ext4fs_free_node(oldnode, currroot); + return 0; + } + + debug("Got symlink >%s<\n", symlink); + + if (symlink[0] == '/') { + ext4fs_free_node(oldnode, currroot); + oldnode = &ext4fs_root->diropen; + } + + /* Lookup the node the symlink points to. */ + status = ext4fs_find_file1(symlink, oldnode, + &currnode, &type); + + free(symlink); + + if (status == 0) { + ext4fs_free_node(oldnode, currroot); + return 0; + } + } + + ext4fs_free_node(oldnode, currroot); + + /* Found the node! */ + if (!next || *next == '\0') { + *currfound = currnode; + *foundtype = type; + return 1; + } + name = next; + } + return -1; +} + +int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, + struct ext2fs_node **foundnode, int expecttype) +{ + int status; + int foundtype = FILETYPE_DIRECTORY; + + symlinknest = 0; + if (!path) + return 0; + + status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype); + if (status == 0) + return 0; + + /* Check if the node that was found was of the expected type. */ + if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) + return 0; + else if ((expecttype == FILETYPE_DIRECTORY) + && (foundtype != expecttype)) + return 0; + + return 1; +} + +int ext4fs_open(const char *filename, loff_t *len) +{ + struct ext2fs_node *fdiro = NULL; + int status; + + if (ext4fs_root == NULL) + return -1; + + ext4fs_file = NULL; + status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, + FILETYPE_REG); + if (status == 0) + goto fail; + + if (!fdiro->inode_read) { + status = ext4fs_read_inode(fdiro->data, fdiro->ino, + &fdiro->inode); + if (status == 0) + goto fail; + } + *len = le32_to_cpu(fdiro->inode.size); + ext4fs_file = fdiro; + + return 0; +fail: + ext4fs_free_node(fdiro, &ext4fs_root->diropen); + + return -1; +} + +int ext4fs_mount(unsigned part_length) +{ + struct ext2_data *data; + int status; + struct ext_filesystem *fs = get_fs(); + data = zalloc(SUPERBLOCK_SIZE); + if (!data) + return 0; + + /* Read the superblock. */ + status = ext4_read_superblock((char *)&data->sblock); + + if (status == 0) + goto fail; + + /* Make sure this is an ext2 filesystem. */ + if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC) + goto fail_noerr; + + + if (le32_to_cpu(data->sblock.revision_level) == 0) { + fs->inodesz = 128; + fs->gdsize = 32; + } else { + debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n", + __le32_to_cpu(data->sblock.feature_compatibility), + __le32_to_cpu(data->sblock.feature_incompat), + __le32_to_cpu(data->sblock.feature_ro_compat)); + + fs->inodesz = le16_to_cpu(data->sblock.inode_size); + fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) & + EXT4_FEATURE_INCOMPAT_64BIT ? + le16_to_cpu(data->sblock.descriptor_size) : 32; + } + + debug("EXT2 rev %d, inode_size %d, descriptor size %d\n", + le32_to_cpu(data->sblock.revision_level), + fs->inodesz, fs->gdsize); + + data->diropen.data = data; + data->diropen.ino = 2; + data->diropen.inode_read = 1; + data->inode = &data->diropen.inode; + + status = ext4fs_read_inode(data, 2, data->inode); + if (status == 0) + goto fail; + + ext4fs_root = data; + + return 1; +fail: + printf("Failed to mount ext2 filesystem...\n"); +fail_noerr: + free(data); + ext4fs_root = NULL; + + return 0; +} |