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Diffstat (limited to 'e2fsprogs/ext2fs/openfs.c')
-rw-r--r--e2fsprogs/ext2fs/openfs.c330
1 files changed, 0 insertions, 330 deletions
diff --git a/e2fsprogs/ext2fs/openfs.c b/e2fsprogs/ext2fs/openfs.c
deleted file mode 100644
index 716be060f..000000000
--- a/e2fsprogs/ext2fs/openfs.c
+++ /dev/null
@@ -1,330 +0,0 @@
-/* vi: set sw=4 ts=4: */
-/*
- * openfs.c --- open an ext2 filesystem
- *
- * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
- *
- * %Begin-Header%
- * This file may be redistributed under the terms of the GNU Public
- * License.
- * %End-Header%
- */
-
-#include <stdio.h>
-#include <string.h>
-#if HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-#include <fcntl.h>
-#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 "ext2fs.h"
-#include "e2image.h"
-
-blk_t ext2fs_descriptor_block_loc(ext2_filsys fs, blk_t group_block, dgrp_t i)
-{
- int bg;
- int has_super = 0;
- int ret_blk;
-
- if (!(fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) ||
- (i < fs->super->s_first_meta_bg))
- return (group_block + i + 1);
-
- bg = (fs->blocksize / sizeof (struct ext2_group_desc)) * i;
- if (ext2fs_bg_has_super(fs, bg))
- has_super = 1;
- ret_blk = (fs->super->s_first_data_block + has_super +
- (bg * fs->super->s_blocks_per_group));
- /*
- * If group_block is not the normal value, we're trying to use
- * the backup group descriptors and superblock --- so use the
- * alternate location of the second block group in the
- * metablock group. Ideally we should be testing each bg
- * descriptor block individually for correctness, but we don't
- * have the infrastructure in place to do that.
- */
- if (group_block != fs->super->s_first_data_block &&
- ((ret_blk + fs->super->s_blocks_per_group) <
- fs->super->s_blocks_count))
- ret_blk += fs->super->s_blocks_per_group;
- return ret_blk;
-}
-
-errcode_t ext2fs_open(const char *name, int flags, int superblock,
- unsigned int block_size, io_manager manager,
- ext2_filsys *ret_fs)
-{
- return ext2fs_open2(name, 0, flags, superblock, block_size,
- manager, ret_fs);
-}
-
-/*
- * Note: if superblock is non-zero, block-size must also be non-zero.
- * Superblock and block_size can be zero to use the default size.
- *
- * Valid flags for ext2fs_open()
- *
- * EXT2_FLAG_RW - Open the filesystem for read/write.
- * EXT2_FLAG_FORCE - Open the filesystem even if some of the
- * features aren't supported.
- * EXT2_FLAG_JOURNAL_DEV_OK - Open an ext3 journal device
- */
-errcode_t ext2fs_open2(const char *name, const char *io_options,
- int flags, int superblock,
- unsigned int block_size, io_manager manager,
- ext2_filsys *ret_fs)
-{
- ext2_filsys fs;
- errcode_t retval;
- unsigned long i;
- int groups_per_block, blocks_per_group;
- blk_t group_block, blk;
- char *dest, *cp;
-#if BB_BIG_ENDIAN
- int j;
- struct ext2_group_desc *gdp;
-#endif
-
- EXT2_CHECK_MAGIC(manager, EXT2_ET_MAGIC_IO_MANAGER);
-
- retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
- if (retval)
- return retval;
-
- memset(fs, 0, sizeof(struct struct_ext2_filsys));
- fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS;
- fs->flags = flags;
- fs->umask = 022;
- retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name);
- if (retval)
- goto cleanup;
- strcpy(fs->device_name, name);
- cp = strchr(fs->device_name, '?');
- if (!io_options && cp) {
- *cp++ = 0;
- io_options = cp;
- }
-
- retval = manager->open(fs->device_name,
- (flags & EXT2_FLAG_RW) ? IO_FLAG_RW : 0,
- &fs->io);
- if (retval)
- goto cleanup;
- if (io_options &&
- (retval = io_channel_set_options(fs->io, io_options)))
- goto cleanup;
- fs->image_io = fs->io;
- fs->io->app_data = fs;
- retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->super);
- if (retval)
- goto cleanup;
- if (flags & EXT2_FLAG_IMAGE_FILE) {
- retval = ext2fs_get_mem(sizeof(struct ext2_image_hdr),
- &fs->image_header);
- if (retval)
- goto cleanup;
- retval = io_channel_read_blk(fs->io, 0,
- -(int)sizeof(struct ext2_image_hdr),
- fs->image_header);
- if (retval)
- goto cleanup;
- if (fs->image_header->magic_number != EXT2_ET_MAGIC_E2IMAGE)
- return EXT2_ET_MAGIC_E2IMAGE;
- superblock = 1;
- block_size = fs->image_header->fs_blocksize;
- }
-
- /*
- * If the user specifies a specific block # for the
- * superblock, then he/she must also specify the block size!
- * Otherwise, read the master superblock located at offset
- * SUPERBLOCK_OFFSET from the start of the partition.
- *
- * Note: we only save a backup copy of the superblock if we
- * are reading the superblock from the primary superblock location.
- */
- if (superblock) {
- if (!block_size) {
- retval = EXT2_ET_INVALID_ARGUMENT;
- goto cleanup;
- }
- io_channel_set_blksize(fs->io, block_size);
- group_block = superblock;
- fs->orig_super = 0;
- } else {
- io_channel_set_blksize(fs->io, SUPERBLOCK_OFFSET);
- superblock = 1;
- group_block = 0;
- retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->orig_super);
- if (retval)
- goto cleanup;
- }
- retval = io_channel_read_blk(fs->io, superblock, -SUPERBLOCK_SIZE,
- fs->super);
- if (retval)
- goto cleanup;
- if (fs->orig_super)
- memcpy(fs->orig_super, fs->super, SUPERBLOCK_SIZE);
-
-#if BB_BIG_ENDIAN
- if ((fs->super->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES)) {
- fs->flags |= EXT2_FLAG_SWAP_BYTES;
-
- ext2fs_swap_super(fs->super);
- }
-#endif
-
- if (fs->super->s_magic != EXT2_SUPER_MAGIC) {
- retval = EXT2_ET_BAD_MAGIC;
- goto cleanup;
- }
- if (fs->super->s_rev_level > EXT2_LIB_CURRENT_REV) {
- retval = EXT2_ET_REV_TOO_HIGH;
- goto cleanup;
- }
-
- /*
- * Check for feature set incompatibility
- */
- if (!(flags & EXT2_FLAG_FORCE)) {
- if (fs->super->s_feature_incompat &
- ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) {
- retval = EXT2_ET_UNSUPP_FEATURE;
- goto cleanup;
- }
- if ((flags & EXT2_FLAG_RW) &&
- (fs->super->s_feature_ro_compat &
- ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP)) {
- retval = EXT2_ET_RO_UNSUPP_FEATURE;
- goto cleanup;
- }
- if (!(flags & EXT2_FLAG_JOURNAL_DEV_OK) &&
- (fs->super->s_feature_incompat &
- EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
- retval = EXT2_ET_UNSUPP_FEATURE;
- goto cleanup;
- }
- }
-
- fs->blocksize = EXT2_BLOCK_SIZE(fs->super);
- if (fs->blocksize == 0) {
- retval = EXT2_ET_CORRUPT_SUPERBLOCK;
- goto cleanup;
- }
- fs->fragsize = EXT2_FRAG_SIZE(fs->super);
- fs->inode_blocks_per_group = ((fs->super->s_inodes_per_group *
- EXT2_INODE_SIZE(fs->super) +
- EXT2_BLOCK_SIZE(fs->super) - 1) /
- EXT2_BLOCK_SIZE(fs->super));
- if (block_size) {
- if (block_size != fs->blocksize) {
- retval = EXT2_ET_UNEXPECTED_BLOCK_SIZE;
- goto cleanup;
- }
- }
- /*
- * Set the blocksize to the filesystem's blocksize.
- */
- io_channel_set_blksize(fs->io, fs->blocksize);
-
- /*
- * If this is an external journal device, don't try to read
- * the group descriptors, because they're not there.
- */
- if (fs->super->s_feature_incompat &
- EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
- fs->group_desc_count = 0;
- *ret_fs = fs;
- return 0;
- }
-
- /*
- * Read group descriptors
- */
- blocks_per_group = EXT2_BLOCKS_PER_GROUP(fs->super);
- if (blocks_per_group == 0 ||
- blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(fs->super) ||
- fs->inode_blocks_per_group > EXT2_MAX_INODES_PER_GROUP(fs->super)) {
- retval = EXT2_ET_CORRUPT_SUPERBLOCK;
- goto cleanup;
- }
- fs->group_desc_count = (fs->super->s_blocks_count -
- fs->super->s_first_data_block +
- blocks_per_group - 1) / blocks_per_group;
- fs->desc_blocks = (fs->group_desc_count +
- EXT2_DESC_PER_BLOCK(fs->super) - 1)
- / EXT2_DESC_PER_BLOCK(fs->super);
- retval = ext2fs_get_mem(fs->desc_blocks * fs->blocksize,
- &fs->group_desc);
- if (retval)
- goto cleanup;
- if (!group_block)
- group_block = fs->super->s_first_data_block;
- dest = (char *) fs->group_desc;
- groups_per_block = fs->blocksize / sizeof(struct ext2_group_desc);
- for (i=0 ; i < fs->desc_blocks; i++) {
- blk = ext2fs_descriptor_block_loc(fs, group_block, i);
- retval = io_channel_read_blk(fs->io, blk, 1, dest);
- if (retval)
- goto cleanup;
-#if BB_BIG_ENDIAN
- if (fs->flags & EXT2_FLAG_SWAP_BYTES) {
- gdp = (struct ext2_group_desc *) dest;
- for (j=0; j < groups_per_block; j++)
- ext2fs_swap_group_desc(gdp++);
- }
-#endif
- dest += fs->blocksize;
- }
-
- *ret_fs = fs;
- return 0;
-cleanup:
- ext2fs_free(fs);
- return retval;
-}
-
-/*
- * Set/get the filesystem data I/O channel.
- *
- * These functions are only valid if EXT2_FLAG_IMAGE_FILE is true.
- */
-errcode_t ext2fs_get_data_io(ext2_filsys fs, io_channel *old_io)
-{
- if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0)
- return EXT2_ET_NOT_IMAGE_FILE;
- if (old_io) {
- *old_io = (fs->image_io == fs->io) ? 0 : fs->io;
- }
- return 0;
-}
-
-errcode_t ext2fs_set_data_io(ext2_filsys fs, io_channel new_io)
-{
- if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0)
- return EXT2_ET_NOT_IMAGE_FILE;
- fs->io = new_io ? new_io : fs->image_io;
- return 0;
-}
-
-errcode_t ext2fs_rewrite_to_io(ext2_filsys fs, io_channel new_io)
-{
- if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0)
- return EXT2_ET_NOT_IMAGE_FILE;
- fs->io = fs->image_io = new_io;
- fs->flags |= EXT2_FLAG_DIRTY | EXT2_FLAG_RW |
- EXT2_FLAG_BB_DIRTY | EXT2_FLAG_IB_DIRTY;
- fs->flags &= ~EXT2_FLAG_IMAGE_FILE;
- return 0;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 13:12:59 +0000