| /* |
| * inode.c --- utility routines to read and write inodes |
| * |
| * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o. |
| * |
| * %Begin-Header% |
| * This file may be redistributed under the terms of the GNU Library |
| * General Public License, version 2. |
| * %End-Header% |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #if HAVE_ERRNO_H |
| #include <errno.h> |
| #endif |
| #include <time.h> |
| #if HAVE_SYS_STAT_H |
| #include <sys/stat.h> |
| #endif |
| #if HAVE_SYS_TYPES_H |
| #include <sys/types.h> |
| #endif |
| |
| #include "ext2_fs.h" |
| #include "ext2fsP.h" |
| #include "e2image.h" |
| |
| struct ext2_struct_inode_scan { |
| errcode_t magic; |
| ext2_filsys fs; |
| ext2_ino_t current_inode; |
| blk64_t current_block; |
| dgrp_t current_group; |
| ext2_ino_t inodes_left; |
| blk_t blocks_left; |
| dgrp_t groups_left; |
| blk_t inode_buffer_blocks; |
| char * inode_buffer; |
| int inode_size; |
| char * ptr; |
| int bytes_left; |
| char *temp_buffer; |
| errcode_t (*done_group)(ext2_filsys fs, |
| ext2_inode_scan scan, |
| dgrp_t group, |
| void * priv_data); |
| void * done_group_data; |
| int bad_block_ptr; |
| int scan_flags; |
| int reserved[6]; |
| }; |
| |
| /* |
| * This routine flushes the icache, if it exists. |
| */ |
| errcode_t ext2fs_flush_icache(ext2_filsys fs) |
| { |
| int i; |
| |
| if (!fs->icache) |
| return 0; |
| |
| for (i=0; i < fs->icache->cache_size; i++) |
| fs->icache->cache[i].ino = 0; |
| |
| fs->icache->buffer_blk = 0; |
| return 0; |
| } |
| |
| static errcode_t create_icache(ext2_filsys fs) |
| { |
| errcode_t retval; |
| |
| if (fs->icache) |
| return 0; |
| retval = ext2fs_get_mem(sizeof(struct ext2_inode_cache), &fs->icache); |
| if (retval) |
| return retval; |
| |
| memset(fs->icache, 0, sizeof(struct ext2_inode_cache)); |
| retval = ext2fs_get_mem(fs->blocksize, &fs->icache->buffer); |
| if (retval) { |
| ext2fs_free_mem(&fs->icache); |
| return retval; |
| } |
| fs->icache->buffer_blk = 0; |
| fs->icache->cache_last = -1; |
| fs->icache->cache_size = 4; |
| fs->icache->refcount = 1; |
| retval = ext2fs_get_array(fs->icache->cache_size, |
| sizeof(struct ext2_inode_cache_ent), |
| &fs->icache->cache); |
| if (retval) { |
| ext2fs_free_mem(&fs->icache->buffer); |
| ext2fs_free_mem(&fs->icache); |
| return retval; |
| } |
| ext2fs_flush_icache(fs); |
| return 0; |
| } |
| |
| errcode_t ext2fs_open_inode_scan(ext2_filsys fs, int buffer_blocks, |
| ext2_inode_scan *ret_scan) |
| { |
| ext2_inode_scan scan; |
| errcode_t retval; |
| errcode_t (*save_get_blocks)(ext2_filsys f, ext2_ino_t ino, blk_t *blocks); |
| |
| EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
| |
| /* |
| * If fs->badblocks isn't set, then set it --- since the inode |
| * scanning functions require it. |
| */ |
| if (fs->badblocks == 0) { |
| /* |
| * Temporarly save fs->get_blocks and set it to zero, |
| * for compatibility with old e2fsck's. |
| */ |
| save_get_blocks = fs->get_blocks; |
| fs->get_blocks = 0; |
| retval = ext2fs_read_bb_inode(fs, &fs->badblocks); |
| if (retval && fs->badblocks) { |
| ext2fs_badblocks_list_free(fs->badblocks); |
| fs->badblocks = 0; |
| } |
| fs->get_blocks = save_get_blocks; |
| } |
| |
| retval = ext2fs_get_mem(sizeof(struct ext2_struct_inode_scan), &scan); |
| if (retval) |
| return retval; |
| memset(scan, 0, sizeof(struct ext2_struct_inode_scan)); |
| |
| scan->magic = EXT2_ET_MAGIC_INODE_SCAN; |
| scan->fs = fs; |
| scan->inode_size = EXT2_INODE_SIZE(fs->super); |
| scan->bytes_left = 0; |
| scan->current_group = 0; |
| scan->groups_left = fs->group_desc_count - 1; |
| scan->inode_buffer_blocks = buffer_blocks ? buffer_blocks : 8; |
| scan->current_block = ext2fs_inode_table_loc(scan->fs, |
| scan->current_group); |
| scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super); |
| scan->blocks_left = scan->fs->inode_blocks_per_group; |
| if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super, |
| EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { |
| scan->inodes_left -= |
| ext2fs_bg_itable_unused(fs, scan->current_group); |
| scan->blocks_left = |
| (scan->inodes_left + |
| (fs->blocksize / scan->inode_size - 1)) * |
| scan->inode_size / fs->blocksize; |
| } |
| retval = io_channel_alloc_buf(fs->io, scan->inode_buffer_blocks, |
| &scan->inode_buffer); |
| scan->done_group = 0; |
| scan->done_group_data = 0; |
| scan->bad_block_ptr = 0; |
| if (retval) { |
| ext2fs_free_mem(&scan); |
| return retval; |
| } |
| retval = ext2fs_get_mem(scan->inode_size, &scan->temp_buffer); |
| if (retval) { |
| ext2fs_free_mem(&scan->inode_buffer); |
| ext2fs_free_mem(&scan); |
| return retval; |
| } |
| if (scan->fs->badblocks && scan->fs->badblocks->num) |
| scan->scan_flags |= EXT2_SF_CHK_BADBLOCKS; |
| if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super, |
| EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) |
| scan->scan_flags |= EXT2_SF_DO_LAZY; |
| *ret_scan = scan; |
| return 0; |
| } |
| |
| void ext2fs_close_inode_scan(ext2_inode_scan scan) |
| { |
| if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) |
| return; |
| |
| ext2fs_free_mem(&scan->inode_buffer); |
| scan->inode_buffer = NULL; |
| ext2fs_free_mem(&scan->temp_buffer); |
| scan->temp_buffer = NULL; |
| ext2fs_free_mem(&scan); |
| return; |
| } |
| |
| void ext2fs_set_inode_callback(ext2_inode_scan scan, |
| errcode_t (*done_group)(ext2_filsys fs, |
| ext2_inode_scan scan, |
| dgrp_t group, |
| void * priv_data), |
| void *done_group_data) |
| { |
| if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) |
| return; |
| |
| scan->done_group = done_group; |
| scan->done_group_data = done_group_data; |
| } |
| |
| int ext2fs_inode_scan_flags(ext2_inode_scan scan, int set_flags, |
| int clear_flags) |
| { |
| int old_flags; |
| |
| if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) |
| return 0; |
| |
| old_flags = scan->scan_flags; |
| scan->scan_flags &= ~clear_flags; |
| scan->scan_flags |= set_flags; |
| return old_flags; |
| } |
| |
| /* |
| * This function is called by ext2fs_get_next_inode when it needs to |
| * get ready to read in a new blockgroup. |
| */ |
| static errcode_t get_next_blockgroup(ext2_inode_scan scan) |
| { |
| ext2_filsys fs = scan->fs; |
| |
| scan->current_group++; |
| scan->groups_left--; |
| |
| scan->current_block = ext2fs_inode_table_loc(scan->fs, |
| scan->current_group); |
| scan->current_inode = scan->current_group * |
| EXT2_INODES_PER_GROUP(fs->super); |
| |
| scan->bytes_left = 0; |
| scan->inodes_left = EXT2_INODES_PER_GROUP(fs->super); |
| scan->blocks_left = fs->inode_blocks_per_group; |
| if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super, |
| EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { |
| scan->inodes_left -= |
| ext2fs_bg_itable_unused(fs, scan->current_group); |
| scan->blocks_left = |
| (scan->inodes_left + |
| (fs->blocksize / scan->inode_size - 1)) * |
| scan->inode_size / fs->blocksize; |
| } |
| |
| return 0; |
| } |
| |
| errcode_t ext2fs_inode_scan_goto_blockgroup(ext2_inode_scan scan, |
| int group) |
| { |
| scan->current_group = group - 1; |
| scan->groups_left = scan->fs->group_desc_count - group; |
| return get_next_blockgroup(scan); |
| } |
| |
| /* |
| * This function is called by get_next_blocks() to check for bad |
| * blocks in the inode table. |
| * |
| * This function assumes that badblocks_list->list is sorted in |
| * increasing order. |
| */ |
| static errcode_t check_for_inode_bad_blocks(ext2_inode_scan scan, |
| blk64_t *num_blocks) |
| { |
| blk64_t blk = scan->current_block; |
| badblocks_list bb = scan->fs->badblocks; |
| |
| /* |
| * If the inode table is missing, then obviously there are no |
| * bad blocks. :-) |
| */ |
| if (blk == 0) |
| return 0; |
| |
| /* |
| * If the current block is greater than the bad block listed |
| * in the bad block list, then advance the pointer until this |
| * is no longer the case. If we run out of bad blocks, then |
| * we don't need to do any more checking! |
| */ |
| while (blk > bb->list[scan->bad_block_ptr]) { |
| if (++scan->bad_block_ptr >= bb->num) { |
| scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS; |
| return 0; |
| } |
| } |
| |
| /* |
| * If the current block is equal to the bad block listed in |
| * the bad block list, then handle that one block specially. |
| * (We could try to handle runs of bad blocks, but that |
| * only increases CPU efficiency by a small amount, at the |
| * expense of a huge expense of code complexity, and for an |
| * uncommon case at that.) |
| */ |
| if (blk == bb->list[scan->bad_block_ptr]) { |
| scan->scan_flags |= EXT2_SF_BAD_INODE_BLK; |
| *num_blocks = 1; |
| if (++scan->bad_block_ptr >= bb->num) |
| scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS; |
| return 0; |
| } |
| |
| /* |
| * If there is a bad block in the range that we're about to |
| * read in, adjust the number of blocks to read so that we we |
| * don't read in the bad block. (Then the next block to read |
| * will be the bad block, which is handled in the above case.) |
| */ |
| if ((blk + *num_blocks) > bb->list[scan->bad_block_ptr]) |
| *num_blocks = (int) (bb->list[scan->bad_block_ptr] - blk); |
| |
| return 0; |
| } |
| |
| /* |
| * This function is called by ext2fs_get_next_inode when it needs to |
| * read in more blocks from the current blockgroup's inode table. |
| */ |
| static errcode_t get_next_blocks(ext2_inode_scan scan) |
| { |
| blk64_t num_blocks; |
| errcode_t retval; |
| |
| /* |
| * Figure out how many blocks to read; we read at most |
| * inode_buffer_blocks, and perhaps less if there aren't that |
| * many blocks left to read. |
| */ |
| num_blocks = scan->inode_buffer_blocks; |
| if (num_blocks > scan->blocks_left) |
| num_blocks = scan->blocks_left; |
| |
| /* |
| * If the past block "read" was a bad block, then mark the |
| * left-over extra bytes as also being bad. |
| */ |
| if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) { |
| if (scan->bytes_left) |
| scan->scan_flags |= EXT2_SF_BAD_EXTRA_BYTES; |
| scan->scan_flags &= ~EXT2_SF_BAD_INODE_BLK; |
| } |
| |
| /* |
| * Do inode bad block processing, if necessary. |
| */ |
| if (scan->scan_flags & EXT2_SF_CHK_BADBLOCKS) { |
| retval = check_for_inode_bad_blocks(scan, &num_blocks); |
| if (retval) |
| return retval; |
| } |
| |
| if ((scan->scan_flags & EXT2_SF_BAD_INODE_BLK) || |
| (scan->current_block == 0)) { |
| memset(scan->inode_buffer, 0, |
| (size_t) num_blocks * scan->fs->blocksize); |
| } else { |
| retval = io_channel_read_blk64(scan->fs->io, |
| scan->current_block, |
| (int) num_blocks, |
| scan->inode_buffer); |
| if (retval) |
| return EXT2_ET_NEXT_INODE_READ; |
| } |
| scan->ptr = scan->inode_buffer; |
| scan->bytes_left = num_blocks * scan->fs->blocksize; |
| |
| scan->blocks_left -= num_blocks; |
| if (scan->current_block) |
| scan->current_block += num_blocks; |
| return 0; |
| } |
| |
| #if 0 |
| /* |
| * Returns 1 if the entire inode_buffer has a non-zero size and |
| * contains all zeros. (Not just deleted inodes, since that means |
| * that part of the inode table was used at one point; we want all |
| * zeros, which means that the inode table is pristine.) |
| */ |
| static inline int is_empty_scan(ext2_inode_scan scan) |
| { |
| int i; |
| |
| if (scan->bytes_left == 0) |
| return 0; |
| |
| for (i=0; i < scan->bytes_left; i++) |
| if (scan->ptr[i]) |
| return 0; |
| return 1; |
| } |
| #endif |
| |
| errcode_t ext2fs_get_next_inode_full(ext2_inode_scan scan, ext2_ino_t *ino, |
| struct ext2_inode *inode, int bufsize) |
| { |
| errcode_t retval; |
| int extra_bytes = 0; |
| |
| EXT2_CHECK_MAGIC(scan, EXT2_ET_MAGIC_INODE_SCAN); |
| |
| /* |
| * Do we need to start reading a new block group? |
| */ |
| if (scan->inodes_left <= 0) { |
| force_new_group: |
| if (scan->done_group) { |
| retval = (scan->done_group) |
| (scan->fs, scan, scan->current_group, |
| scan->done_group_data); |
| if (retval) |
| return retval; |
| } |
| if (scan->groups_left <= 0) { |
| *ino = 0; |
| return 0; |
| } |
| retval = get_next_blockgroup(scan); |
| if (retval) |
| return retval; |
| } |
| /* |
| * These checks are done outside the above if statement so |
| * they can be done for block group #0. |
| */ |
| if ((scan->scan_flags & EXT2_SF_DO_LAZY) && |
| (ext2fs_bg_flags_test(scan->fs, scan->current_group, EXT2_BG_INODE_UNINIT) |
| )) |
| goto force_new_group; |
| if (scan->inodes_left == 0) |
| goto force_new_group; |
| if (scan->current_block == 0) { |
| if (scan->scan_flags & EXT2_SF_SKIP_MISSING_ITABLE) { |
| goto force_new_group; |
| } else |
| return EXT2_ET_MISSING_INODE_TABLE; |
| } |
| |
| |
| /* |
| * Have we run out of space in the inode buffer? If so, we |
| * need to read in more blocks. |
| */ |
| if (scan->bytes_left < scan->inode_size) { |
| memcpy(scan->temp_buffer, scan->ptr, scan->bytes_left); |
| extra_bytes = scan->bytes_left; |
| |
| retval = get_next_blocks(scan); |
| if (retval) |
| return retval; |
| #if 0 |
| /* |
| * XXX test Need check for used inode somehow. |
| * (Note: this is hard.) |
| */ |
| if (is_empty_scan(scan)) |
| goto force_new_group; |
| #endif |
| } |
| |
| retval = 0; |
| if (extra_bytes) { |
| memcpy(scan->temp_buffer+extra_bytes, scan->ptr, |
| scan->inode_size - extra_bytes); |
| scan->ptr += scan->inode_size - extra_bytes; |
| scan->bytes_left -= scan->inode_size - extra_bytes; |
| |
| #ifdef WORDS_BIGENDIAN |
| memset(inode, 0, bufsize); |
| ext2fs_swap_inode_full(scan->fs, |
| (struct ext2_inode_large *) inode, |
| (struct ext2_inode_large *) scan->temp_buffer, |
| 0, bufsize); |
| #else |
| *inode = *((struct ext2_inode *) scan->temp_buffer); |
| #endif |
| if (scan->scan_flags & EXT2_SF_BAD_EXTRA_BYTES) |
| retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE; |
| scan->scan_flags &= ~EXT2_SF_BAD_EXTRA_BYTES; |
| } else { |
| #ifdef WORDS_BIGENDIAN |
| memset(inode, 0, bufsize); |
| ext2fs_swap_inode_full(scan->fs, |
| (struct ext2_inode_large *) inode, |
| (struct ext2_inode_large *) scan->ptr, |
| 0, bufsize); |
| #else |
| memcpy(inode, scan->ptr, bufsize); |
| #endif |
| scan->ptr += scan->inode_size; |
| scan->bytes_left -= scan->inode_size; |
| if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) |
| retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE; |
| } |
| |
| scan->inodes_left--; |
| scan->current_inode++; |
| *ino = scan->current_inode; |
| return retval; |
| } |
| |
| errcode_t ext2fs_get_next_inode(ext2_inode_scan scan, ext2_ino_t *ino, |
| struct ext2_inode *inode) |
| { |
| return ext2fs_get_next_inode_full(scan, ino, inode, |
| sizeof(struct ext2_inode)); |
| } |
| |
| /* |
| * Functions to read and write a single inode. |
| */ |
| errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino, |
| struct ext2_inode * inode, int bufsize) |
| { |
| blk64_t block_nr; |
| unsigned long group, block, offset; |
| char *ptr; |
| errcode_t retval; |
| int clen, i, inodes_per_block, length; |
| io_channel io; |
| |
| EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
| |
| /* Check to see if user has an override function */ |
| if (fs->read_inode && |
| ((bufsize == sizeof(struct ext2_inode)) || |
| (EXT2_INODE_SIZE(fs->super) == sizeof(struct ext2_inode)))) { |
| retval = (fs->read_inode)(fs, ino, inode); |
| if (retval != EXT2_ET_CALLBACK_NOTHANDLED) |
| return retval; |
| } |
| if ((ino == 0) || (ino > fs->super->s_inodes_count)) |
| return EXT2_ET_BAD_INODE_NUM; |
| /* Create inode cache if not present */ |
| if (!fs->icache) { |
| retval = create_icache(fs); |
| if (retval) |
| return retval; |
| } |
| /* Check to see if it's in the inode cache */ |
| if (bufsize == sizeof(struct ext2_inode)) { |
| /* only old good inode can be retrieved from the cache */ |
| for (i=0; i < fs->icache->cache_size; i++) { |
| if (fs->icache->cache[i].ino == ino) { |
| *inode = fs->icache->cache[i].inode; |
| return 0; |
| } |
| } |
| } |
| if (fs->flags & EXT2_FLAG_IMAGE_FILE) { |
| inodes_per_block = fs->blocksize / EXT2_INODE_SIZE(fs->super); |
| block_nr = fs->image_header->offset_inode / fs->blocksize; |
| block_nr += (ino - 1) / inodes_per_block; |
| offset = ((ino - 1) % inodes_per_block) * |
| EXT2_INODE_SIZE(fs->super); |
| io = fs->image_io; |
| } else { |
| group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super); |
| if (group > fs->group_desc_count) |
| return EXT2_ET_BAD_INODE_NUM; |
| offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) * |
| EXT2_INODE_SIZE(fs->super); |
| block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super); |
| if (!ext2fs_inode_table_loc(fs, (unsigned) group)) |
| return EXT2_ET_MISSING_INODE_TABLE; |
| block_nr = ext2fs_inode_table_loc(fs, group) + |
| block; |
| io = fs->io; |
| } |
| offset &= (EXT2_BLOCK_SIZE(fs->super) - 1); |
| |
| length = EXT2_INODE_SIZE(fs->super); |
| if (bufsize < length) |
| length = bufsize; |
| |
| ptr = (char *) inode; |
| while (length) { |
| clen = length; |
| if ((offset + length) > fs->blocksize) |
| clen = fs->blocksize - offset; |
| |
| if (block_nr != fs->icache->buffer_blk) { |
| retval = io_channel_read_blk64(io, block_nr, 1, |
| fs->icache->buffer); |
| if (retval) |
| return retval; |
| fs->icache->buffer_blk = block_nr; |
| } |
| |
| memcpy(ptr, ((char *) fs->icache->buffer) + (unsigned) offset, |
| clen); |
| |
| offset = 0; |
| length -= clen; |
| ptr += clen; |
| block_nr++; |
| } |
| |
| #ifdef WORDS_BIGENDIAN |
| ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) inode, |
| (struct ext2_inode_large *) inode, |
| 0, bufsize); |
| #endif |
| |
| /* Update the inode cache */ |
| fs->icache->cache_last = (fs->icache->cache_last + 1) % |
| fs->icache->cache_size; |
| fs->icache->cache[fs->icache->cache_last].ino = ino; |
| fs->icache->cache[fs->icache->cache_last].inode = *inode; |
| |
| return 0; |
| } |
| |
| errcode_t ext2fs_read_inode(ext2_filsys fs, ext2_ino_t ino, |
| struct ext2_inode * inode) |
| { |
| return ext2fs_read_inode_full(fs, ino, inode, |
| sizeof(struct ext2_inode)); |
| } |
| |
| errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino, |
| struct ext2_inode * inode, int bufsize) |
| { |
| blk64_t block_nr; |
| unsigned long group, block, offset; |
| errcode_t retval = 0; |
| struct ext2_inode_large temp_inode, *w_inode; |
| char *ptr; |
| int clen, i, length; |
| |
| EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
| |
| /* Check to see if user provided an override function */ |
| if (fs->write_inode) { |
| retval = (fs->write_inode)(fs, ino, inode); |
| if (retval != EXT2_ET_CALLBACK_NOTHANDLED) |
| return retval; |
| } |
| |
| /* Check to see if the inode cache needs to be updated */ |
| if (fs->icache) { |
| for (i=0; i < fs->icache->cache_size; i++) { |
| if (fs->icache->cache[i].ino == ino) { |
| fs->icache->cache[i].inode = *inode; |
| break; |
| } |
| } |
| } else { |
| retval = create_icache(fs); |
| if (retval) |
| return retval; |
| } |
| |
| if (!(fs->flags & EXT2_FLAG_RW)) |
| return EXT2_ET_RO_FILSYS; |
| |
| if ((ino == 0) || (ino > fs->super->s_inodes_count)) |
| return EXT2_ET_BAD_INODE_NUM; |
| |
| length = bufsize; |
| if (length < EXT2_INODE_SIZE(fs->super)) |
| length = EXT2_INODE_SIZE(fs->super); |
| |
| if (length > (int) sizeof(struct ext2_inode_large)) { |
| w_inode = malloc(length); |
| if (!w_inode) { |
| retval = ENOMEM; |
| goto errout; |
| } |
| } else |
| w_inode = &temp_inode; |
| memset(w_inode, 0, length); |
| |
| #ifdef WORDS_BIGENDIAN |
| ext2fs_swap_inode_full(fs, w_inode, |
| (struct ext2_inode_large *) inode, |
| 1, bufsize); |
| #else |
| memcpy(w_inode, inode, bufsize); |
| #endif |
| |
| group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super); |
| offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) * |
| EXT2_INODE_SIZE(fs->super); |
| block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super); |
| if (!ext2fs_inode_table_loc(fs, (unsigned) group)) { |
| retval = EXT2_ET_MISSING_INODE_TABLE; |
| goto errout; |
| } |
| block_nr = ext2fs_inode_table_loc(fs, (unsigned) group) + block; |
| |
| offset &= (EXT2_BLOCK_SIZE(fs->super) - 1); |
| |
| length = EXT2_INODE_SIZE(fs->super); |
| if (length > bufsize) |
| length = bufsize; |
| |
| ptr = (char *) w_inode; |
| |
| while (length) { |
| clen = length; |
| if ((offset + length) > fs->blocksize) |
| clen = fs->blocksize - offset; |
| |
| if (fs->icache->buffer_blk != block_nr) { |
| retval = io_channel_read_blk64(fs->io, block_nr, 1, |
| fs->icache->buffer); |
| if (retval) |
| goto errout; |
| fs->icache->buffer_blk = block_nr; |
| } |
| |
| |
| memcpy((char *) fs->icache->buffer + (unsigned) offset, |
| ptr, clen); |
| |
| retval = io_channel_write_blk64(fs->io, block_nr, 1, |
| fs->icache->buffer); |
| if (retval) |
| goto errout; |
| |
| offset = 0; |
| ptr += clen; |
| length -= clen; |
| block_nr++; |
| } |
| |
| fs->flags |= EXT2_FLAG_CHANGED; |
| errout: |
| if (w_inode && w_inode != &temp_inode) |
| free(w_inode); |
| return retval; |
| } |
| |
| errcode_t ext2fs_write_inode(ext2_filsys fs, ext2_ino_t ino, |
| struct ext2_inode *inode) |
| { |
| return ext2fs_write_inode_full(fs, ino, inode, |
| sizeof(struct ext2_inode)); |
| } |
| |
| /* |
| * This function should be called when writing a new inode. It makes |
| * sure that extra part of large inodes is initialized properly. |
| */ |
| errcode_t ext2fs_write_new_inode(ext2_filsys fs, ext2_ino_t ino, |
| struct ext2_inode *inode) |
| { |
| struct ext2_inode *buf; |
| int size = EXT2_INODE_SIZE(fs->super); |
| struct ext2_inode_large *large_inode; |
| errcode_t retval; |
| __u32 t = fs->now ? fs->now : time(NULL); |
| |
| if (!inode->i_ctime) |
| inode->i_ctime = t; |
| if (!inode->i_mtime) |
| inode->i_mtime = t; |
| if (!inode->i_atime) |
| inode->i_atime = t; |
| |
| if (size == sizeof(struct ext2_inode)) |
| return ext2fs_write_inode_full(fs, ino, inode, |
| sizeof(struct ext2_inode)); |
| |
| buf = malloc(size); |
| if (!buf) |
| return ENOMEM; |
| |
| memset(buf, 0, size); |
| *buf = *inode; |
| |
| large_inode = (struct ext2_inode_large *) buf; |
| large_inode->i_extra_isize = sizeof(struct ext2_inode_large) - |
| EXT2_GOOD_OLD_INODE_SIZE; |
| if (!large_inode->i_crtime) |
| large_inode->i_crtime = t; |
| |
| retval = ext2fs_write_inode_full(fs, ino, buf, size); |
| free(buf); |
| return retval; |
| } |
| |
| |
| errcode_t ext2fs_get_blocks(ext2_filsys fs, ext2_ino_t ino, blk_t *blocks) |
| { |
| struct ext2_inode inode; |
| int i; |
| errcode_t retval; |
| |
| EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
| |
| if (ino > fs->super->s_inodes_count) |
| return EXT2_ET_BAD_INODE_NUM; |
| |
| if (fs->get_blocks) { |
| if (!(*fs->get_blocks)(fs, ino, blocks)) |
| return 0; |
| } |
| retval = ext2fs_read_inode(fs, ino, &inode); |
| if (retval) |
| return retval; |
| for (i=0; i < EXT2_N_BLOCKS; i++) |
| blocks[i] = inode.i_block[i]; |
| return 0; |
| } |
| |
| errcode_t ext2fs_check_directory(ext2_filsys fs, ext2_ino_t ino) |
| { |
| struct ext2_inode inode; |
| errcode_t retval; |
| |
| EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
| |
| if (ino > fs->super->s_inodes_count) |
| return EXT2_ET_BAD_INODE_NUM; |
| |
| if (fs->check_directory) { |
| retval = (fs->check_directory)(fs, ino); |
| if (retval != EXT2_ET_CALLBACK_NOTHANDLED) |
| return retval; |
| } |
| retval = ext2fs_read_inode(fs, ino, &inode); |
| if (retval) |
| return retval; |
| if (!LINUX_S_ISDIR(inode.i_mode)) |
| return EXT2_ET_NO_DIRECTORY; |
| return 0; |
| } |
| |