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-rw-r--r--src/block.c650
1 files changed, 650 insertions, 0 deletions
diff --git a/src/block.c b/src/block.c
new file mode 100644
index 0000000..fd60df7
--- /dev/null
+++ b/src/block.c
@@ -0,0 +1,650 @@
+/*
+ * This file was modified from e2fsprogs 1.41.4
+ * Use this file when compiling against a newer version of ext2fs headers.
+ * block.c --- iterate over all blocks in an inode
+ * extent.c --- work with extents
+ *
+ * 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%
+ */
+
+/*
+ This is a workaround to allow compilation, but the one line that uses
+ this constant will never run because we open the fs read-only.
+*/
+#define EXT4INO 0
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifndef EXT2_FLAT_INCLUDES
+#define EXT2_FLAT_INCLUDES 0
+#endif
+
+//#include <ext2fs/ext2fs.h>
+#include "ext2fsP.h"
+#include "block.h"
+
+struct block_context {
+ ext2_filsys fs;
+ int (*func)(ext2_filsys fs,
+ blk_t *blocknr,
+ e2_blkcnt_t bcount,
+ blk_t ref_blk,
+ int ref_offset,
+ void *priv_data);
+ e2_blkcnt_t bcount;
+ int bsize;
+ int flags;
+ errcode_t errcode;
+ char *ind_buf;
+ char *dind_buf;
+ char *tind_buf;
+ void *priv_data;
+};
+
+
+//#ifdef BLOCK_FLAG_READ_ONLY
+
+#include <ext2fs/ext3_extents.h>
+struct extent_path {
+ char *buf;
+ int entries;
+ int max_entries;
+ int left;
+ int visit_num;
+ int flags;
+ blk64_t end_blk;
+ void *curr;
+};
+
+
+struct ext2_extent_handle {
+ errcode_t magic;
+ ext2_filsys fs;
+ ext2_ino_t ino;
+ struct ext2_inode *inode;
+ int type;
+ int level;
+ int max_depth;
+ struct extent_path *path;
+};
+
+// Leave the inode intact because it was allocated by new (C++)
+void local_ext2fs_extent_free(ext2_extent_handle_t handle)
+{
+ int i;
+
+ if (!handle)
+ return;
+
+ //if (handle->inode)
+ // ext2fs_free_mem(&handle->inode);
+ if (handle->path) {
+ for (i=1; i < handle->max_depth; i++) {
+ if (handle->path[i].buf)
+ ext2fs_free_mem(&handle->path[i].buf);
+ }
+ ext2fs_free_mem(&handle->path);
+ }
+ ext2fs_free_mem(&handle);
+}
+
+
+// ------------------------------------------------------------------------
+// This function inserts the data from block blocknr[0] into the input buffer
+// 'buf'. The data from the block is inserted into
+// the input buffer beginning at location 'blockcnt'.
+// NOTE: The output returned by this command should be corrected to the proper
+// endianness for the host cpu when reading multi-byte structures from disk.
+int read_block ( ext2_filsys fs, blk_t *blocknr, void *buf )
+{
+ errcode_t retval = io_channel_read_blk ( fs->io, *blocknr, 1, buf );
+ if (retval)
+ fprintf(stderr,"Error %d while read block\n", retval);
+ return retval;
+}
+
+
+
+
+
+errcode_t local_ext2fs_extent_open(ext2_filsys fs, struct ext2_inode inode,
+ ext2_extent_handle_t *ret_handle) {
+
+ struct ext2_extent_handle *handle;
+ struct ext3_extent_header *eh;
+ int i;
+ errcode_t retval;
+ retval = ext2fs_get_mem(sizeof(struct ext2_extent_handle), &handle);
+ if (retval)
+ return retval;
+ memset(handle, 0, sizeof(struct ext2_extent_handle));
+
+ handle->ino = 0;
+ handle->fs = fs;
+ handle->inode = &inode;
+
+ eh = (struct ext3_extent_header *) &handle->inode->i_block[0];
+ for (i=0; i < EXT2_N_BLOCKS; i++)
+ if (handle->inode->i_block[i])
+ break;
+ if (i >= EXT2_N_BLOCKS) {
+ eh->eh_magic = ext2fs_cpu_to_le16(EXT3_EXT_MAGIC);
+ eh->eh_depth = 0;
+ eh->eh_entries = 0;
+ i = (sizeof(handle->inode->i_block) - sizeof(*eh)) /
+ sizeof(struct ext3_extent);
+ eh->eh_max = ext2fs_cpu_to_le16(i);
+ handle->inode->i_flags |= EXT4_EXTENTS_FL;
+ }
+
+
+ handle->max_depth = ext2fs_le16_to_cpu(eh->eh_depth);
+ handle->type = ext2fs_le16_to_cpu(eh->eh_magic);
+
+ retval = ext2fs_get_mem(((handle->max_depth+1) *
+ sizeof(struct extent_path)),
+ &handle->path);
+ memset(handle->path, 0,
+ (handle->max_depth+1) * sizeof(struct extent_path));
+ handle->path[0].buf = (char *) handle->inode->i_block;
+
+ handle->path[0].left = handle->path[0].entries =
+ ext2fs_le16_to_cpu(eh->eh_entries);
+ handle->path[0].max_entries = ext2fs_le16_to_cpu(eh->eh_max);
+ handle->path[0].curr = 0;
+ handle->path[0].end_blk =
+ ((((__u64) handle->inode->i_size_high << 32) +
+ handle->inode->i_size + (fs->blocksize - 1))
+ >> EXT2_BLOCK_SIZE_BITS(fs->super));
+ handle->path[0].visit_num = 1;
+ handle->level = 0;
+ handle->magic = EXT2_ET_MAGIC_EXTENT_HANDLE;
+
+ *ret_handle = handle;
+ //free(handle);
+
+ return 0;
+}
+
+
+
+
+#define check_for_ro_violation_return(ctx, ret) \
+ do { \
+ if (((ctx)->flags & BLOCK_FLAG_READ_ONLY) && \
+ ((ret) & BLOCK_CHANGED)) { \
+ (ctx)->errcode = EXT2_ET_RO_BLOCK_ITERATE; \
+ ret |= BLOCK_ABORT | BLOCK_ERROR; \
+ return ret; \
+ } \
+ } while (0)
+
+#define check_for_ro_violation_goto(ctx, ret, label) \
+ do { \
+ if (((ctx)->flags & BLOCK_FLAG_READ_ONLY) && \
+ ((ret) & BLOCK_CHANGED)) { \
+ (ctx)->errcode = EXT2_ET_RO_BLOCK_ITERATE; \
+ ret |= BLOCK_ABORT | BLOCK_ERROR; \
+ goto label; \
+ } \
+ } while (0)
+
+static int block_iterate_ind(blk_t *ind_block, blk_t ref_block,
+ int ref_offset, struct block_context *ctx)
+{
+ int ret = 0, changed = 0;
+ int i, flags, limit, offset;
+ blk_t *block_nr;
+
+ limit = ctx->fs->blocksize >> 2;
+ if (!(ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
+ !(ctx->flags & BLOCK_FLAG_DATA_ONLY))
+ ret = (*ctx->func)(ctx->fs, ind_block,
+ BLOCK_COUNT_IND, ref_block,
+ ref_offset, ctx->priv_data);
+ check_for_ro_violation_return(ctx, ret);
+ if (!*ind_block || (ret & BLOCK_ABORT)) {
+ ctx->bcount += limit;
+ return ret;
+ }
+ if (*ind_block >= ctx->fs->super->s_blocks_count ||
+ *ind_block < ctx->fs->super->s_first_data_block) {
+ ctx->errcode = EXT2_ET_BAD_IND_BLOCK;
+ ret |= BLOCK_ERROR;
+ return ret;
+ }
+ ctx->errcode = ext2fs_read_ind_block(ctx->fs, *ind_block,
+ ctx->ind_buf);
+ if (ctx->errcode) {
+ ret |= BLOCK_ERROR;
+ return ret;
+ }
+
+ block_nr = (blk_t *) ctx->ind_buf;
+ offset = 0;
+ if (ctx->flags & BLOCK_FLAG_APPEND) {
+ for (i = 0; i < limit; i++, ctx->bcount++, block_nr++) {
+ flags = (*ctx->func)(ctx->fs, block_nr, ctx->bcount,
+ *ind_block, offset,
+ ctx->priv_data);
+ changed |= flags;
+ if (flags & BLOCK_ABORT) {
+ ret |= BLOCK_ABORT;
+ break;
+ }
+ offset += sizeof(blk_t);
+ }
+ } else {
+ for (i = 0; i < limit; i++, ctx->bcount++, block_nr++) {
+ if (*block_nr == 0)
+ continue;
+ flags = (*ctx->func)(ctx->fs, block_nr, ctx->bcount,
+ *ind_block, offset,
+ ctx->priv_data);
+ changed |= flags;
+ if (flags & BLOCK_ABORT) {
+ ret |= BLOCK_ABORT;
+ break;
+ }
+ offset += sizeof(blk_t);
+ }
+ }
+ check_for_ro_violation_return(ctx, changed);
+ if (changed & BLOCK_CHANGED) {
+ ctx->errcode = ext2fs_write_ind_block(ctx->fs, *ind_block,
+ ctx->ind_buf);
+ if (ctx->errcode)
+ ret |= BLOCK_ERROR | BLOCK_ABORT;
+ }
+ if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
+ !(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
+ !(ret & BLOCK_ABORT))
+ ret |= (*ctx->func)(ctx->fs, ind_block,
+ BLOCK_COUNT_IND, ref_block,
+ ref_offset, ctx->priv_data);
+ check_for_ro_violation_return(ctx, ret);
+ return ret;
+}
+
+
+
+static int block_iterate_dind(blk_t *dind_block, blk_t ref_block,
+ int ref_offset, struct block_context *ctx)
+{
+ int ret = 0, changed = 0;
+ int i, flags, limit, offset;
+ blk_t *block_nr;
+
+ limit = ctx->fs->blocksize >> 2;
+ if (!(ctx->flags & (BLOCK_FLAG_DEPTH_TRAVERSE |
+ BLOCK_FLAG_DATA_ONLY)))
+ ret = (*ctx->func)(ctx->fs, dind_block,
+ BLOCK_COUNT_DIND, ref_block,
+ ref_offset, ctx->priv_data);
+ check_for_ro_violation_return(ctx, ret);
+ if (!*dind_block || (ret & BLOCK_ABORT)) {
+ ctx->bcount += limit*limit;
+ return ret;
+ }
+ if (*dind_block >= ctx->fs->super->s_blocks_count ||
+ *dind_block < ctx->fs->super->s_first_data_block) {
+ ctx->errcode = EXT2_ET_BAD_DIND_BLOCK;
+ ret |= BLOCK_ERROR;
+ return ret;
+ }
+ ctx->errcode = ext2fs_read_ind_block(ctx->fs, *dind_block,
+ ctx->dind_buf);
+ if (ctx->errcode) {
+ ret |= BLOCK_ERROR;
+ return ret;
+ }
+
+ block_nr = (blk_t *) ctx->dind_buf;
+ offset = 0;
+ if (ctx->flags & BLOCK_FLAG_APPEND) {
+ for (i = 0; i < limit; i++, block_nr++) {
+ flags = block_iterate_ind(block_nr,
+ *dind_block, offset,
+ ctx);
+ changed |= flags;
+ if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
+ ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
+ break;
+ }
+ offset += sizeof(blk_t);
+ }
+ } else {
+ for (i = 0; i < limit; i++, block_nr++) {
+ if (*block_nr == 0) {
+ ctx->bcount += limit;
+ continue;
+ }
+ flags = block_iterate_ind(block_nr,
+ *dind_block, offset,
+ ctx);
+ changed |= flags;
+ if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
+ ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
+ break;
+ }
+ offset += sizeof(blk_t);
+ }
+ }
+ check_for_ro_violation_return(ctx, changed);
+ if (changed & BLOCK_CHANGED) {
+ ctx->errcode = ext2fs_write_ind_block(ctx->fs, *dind_block,
+ ctx->dind_buf);
+ if (ctx->errcode)
+ ret |= BLOCK_ERROR | BLOCK_ABORT;
+ }
+ if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
+ !(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
+ !(ret & BLOCK_ABORT))
+ ret |= (*ctx->func)(ctx->fs, dind_block,
+ BLOCK_COUNT_DIND, ref_block,
+ ref_offset, ctx->priv_data);
+ check_for_ro_violation_return(ctx, ret);
+ return ret;
+}
+
+
+
+static int block_iterate_tind(blk_t *tind_block, blk_t ref_block,
+ int ref_offset, struct block_context *ctx)
+{
+ int ret = 0, changed = 0;
+ int i, flags, limit, offset;
+ blk_t *block_nr;
+
+ limit = ctx->fs->blocksize >> 2;
+ if (!(ctx->flags & (BLOCK_FLAG_DEPTH_TRAVERSE |
+ BLOCK_FLAG_DATA_ONLY)))
+ ret = (*ctx->func)(ctx->fs, tind_block,
+ BLOCK_COUNT_TIND, ref_block,
+ ref_offset, ctx->priv_data);
+ check_for_ro_violation_return(ctx, ret);
+ if (!*tind_block || (ret & BLOCK_ABORT)) {
+ ctx->bcount += limit*limit*limit;
+ return ret;
+ }
+ if (*tind_block >= ctx->fs->super->s_blocks_count ||
+ *tind_block < ctx->fs->super->s_first_data_block) {
+ ctx->errcode = EXT2_ET_BAD_TIND_BLOCK;
+ ret |= BLOCK_ERROR;
+ return ret;
+ }
+ ctx->errcode = ext2fs_read_ind_block(ctx->fs, *tind_block,
+ ctx->tind_buf);
+ if (ctx->errcode) {
+ ret |= BLOCK_ERROR;
+ return ret;
+ }
+
+ block_nr = (blk_t *) ctx->tind_buf;
+ offset = 0;
+ if (ctx->flags & BLOCK_FLAG_APPEND) {
+ for (i = 0; i < limit; i++, block_nr++) {
+ flags = block_iterate_dind(block_nr,
+ *tind_block,
+ offset, ctx);
+ changed |= flags;
+ if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
+ ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
+ break;
+ }
+ offset += sizeof(blk_t);
+ }
+ } else {
+ for (i = 0; i < limit; i++, block_nr++) {
+ if (*block_nr == 0) {
+ ctx->bcount += limit*limit;
+ continue;
+ }
+ flags = block_iterate_dind(block_nr,
+ *tind_block,
+ offset, ctx);
+ changed |= flags;
+ if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
+ ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
+ break;
+ }
+ offset += sizeof(blk_t);
+ }
+ }
+ check_for_ro_violation_return(ctx, changed);
+ if (changed & BLOCK_CHANGED) {
+ ctx->errcode = ext2fs_write_ind_block(ctx->fs, *tind_block,
+ ctx->tind_buf);
+ if (ctx->errcode)
+ ret |= BLOCK_ERROR | BLOCK_ABORT;
+ }
+ if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
+ !(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
+ !(ret & BLOCK_ABORT))
+ ret |= (*ctx->func)(ctx->fs, tind_block,
+ BLOCK_COUNT_TIND, ref_block,
+ ref_offset, ctx->priv_data);
+ check_for_ro_violation_return(ctx, ret);
+ return ret;
+}
+
+
+
+errcode_t local_block_iterate3(ext2_filsys fs,
+ struct ext2_inode inode, // ext2_ino_t ino,
+ int flags,
+ char *block_buf,
+ int (*func)(ext2_filsys fs,
+ blk_t *blocknr,
+ e2_blkcnt_t blockcnt,
+ blk_t ref_blk,
+ int ref_offset,
+ void *priv_data),
+ void *priv_data)
+{
+ int i;
+ int r, ret = 0;
+ // struct ext2_inode inode;
+ errcode_t retval;
+ struct block_context ctx;
+ int limit;
+
+ EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+ ctx.errcode = 0;
+ /*ctx.errcode = ext2fs_read_inode(fs, ino, &inode);
+ if (ctx.errcode)
+ return ctx.errcode;
+ */
+
+ /*
+ * Check to see if we need to limit large files
+ */
+ if (flags & BLOCK_FLAG_NO_LARGE) {
+ if (!LINUX_S_ISDIR(inode.i_mode) &&
+ (inode.i_size_high != 0))
+ return EXT2_ET_FILE_TOO_BIG;
+ }
+
+ limit = fs->blocksize >> 2;
+
+ ctx.fs = fs;
+ ctx.func = func;
+ ctx.priv_data = priv_data;
+ ctx.flags = flags;
+ ctx.bcount = 0;
+ if (block_buf) {
+ ctx.ind_buf = block_buf;
+ } else {
+ retval = ext2fs_get_array(3, fs->blocksize, &ctx.ind_buf);
+ if (retval)
+ return retval;
+ }
+ ctx.dind_buf = ctx.ind_buf + fs->blocksize;
+ ctx.tind_buf = ctx.dind_buf + fs->blocksize;
+
+ /*
+ * Iterate over the HURD translator block (if present)
+ */
+ if ((fs->super->s_creator_os == EXT2_OS_HURD) &&
+ !(flags & BLOCK_FLAG_DATA_ONLY)) {
+ if (inode.osd1.hurd1.h_i_translator) {
+ ret |= (*ctx.func)(fs,
+ &inode.osd1.hurd1.h_i_translator,
+ BLOCK_COUNT_TRANSLATOR,
+ 0, 0, priv_data);
+ if (ret & BLOCK_ABORT)
+ goto abort_exit;
+ check_for_ro_violation_goto(&ctx, ret, abort_exit);
+ }
+ }
+
+ if (inode.i_flags & EXT4_EXTENTS_FL) {
+ ext2_extent_handle_t handle = NULL;
+ struct ext2fs_extent extent;
+ e2_blkcnt_t blockcnt = 0;
+ blk_t blk, new_blk;
+ int op = EXT2_EXTENT_ROOT;
+ int uninit;
+ unsigned int j;
+
+ ctx.errcode = local_ext2fs_extent_open(fs, inode, &handle);
+ if (ctx.errcode)
+ goto abort_exit;
+
+ while (1) {
+ ctx.errcode = ext2fs_extent_get(handle, op, &extent);
+ if (ctx.errcode) {
+ if (ctx.errcode != EXT2_ET_EXTENT_NO_NEXT)
+ break;
+ ctx.errcode = 0;
+ if (!(flags & BLOCK_FLAG_APPEND))
+ break;
+ blk = 0;
+ r = (*ctx.func)(fs, &blk, blockcnt,
+ 0, 0, priv_data);
+ ret |= r;
+ check_for_ro_violation_goto(&ctx, ret,
+ extent_errout);
+ if (r & BLOCK_CHANGED) {
+ ctx.errcode =
+ ext2fs_extent_set_bmap(handle,
+ (blk64_t) blockcnt++,
+ (blk64_t) blk, 0);
+ if (ctx.errcode || (ret & BLOCK_ABORT))
+ break;
+ continue;
+ }
+ break;
+ }
+
+ op = EXT2_EXTENT_NEXT;
+ blk = extent.e_pblk;
+ if (!(extent.e_flags & EXT2_EXTENT_FLAGS_LEAF)) {
+ if (ctx.flags & BLOCK_FLAG_DATA_ONLY)
+ continue;
+ if ((!(extent.e_flags &
+ EXT2_EXTENT_FLAGS_SECOND_VISIT) &&
+ !(ctx.flags & BLOCK_FLAG_DEPTH_TRAVERSE)) ||
+ ((extent.e_flags &
+ EXT2_EXTENT_FLAGS_SECOND_VISIT) &&
+ (ctx.flags & BLOCK_FLAG_DEPTH_TRAVERSE))) {
+ ret |= (*ctx.func)(fs, &blk,
+ -1, 0, 0, priv_data);
+ if (ret & BLOCK_CHANGED) {
+ extent.e_pblk = blk;
+ ctx.errcode =
+ ext2fs_extent_replace(handle, 0, &extent);
+ if (ctx.errcode)
+ break;
+ }
+ }
+ continue;
+ }
+ uninit = 0;
+ if (extent.e_flags & EXT2_EXTENT_FLAGS_UNINIT)
+ uninit = EXT2_EXTENT_SET_BMAP_UNINIT;
+ for (blockcnt = extent.e_lblk, j = 0;
+ j < extent.e_len;
+ blk++, blockcnt++, j++) {
+ new_blk = blk;
+ r = (*ctx.func)(fs, &new_blk, blockcnt,
+ 0, 0, priv_data);
+ ret |= r;
+ check_for_ro_violation_goto(&ctx, ret,
+ extent_errout);
+ if (r & BLOCK_CHANGED) {
+ ctx.errcode =
+ ext2fs_extent_set_bmap(handle,
+ (blk64_t) blockcnt,
+ (blk64_t) new_blk,
+ uninit);
+ if (ctx.errcode)
+ goto extent_errout;
+ }
+ if (ret & BLOCK_ABORT)
+ break;
+ }
+ }
+
+ extent_errout:
+ local_ext2fs_extent_free(handle);
+ ret |= BLOCK_ERROR | BLOCK_ABORT;
+ goto errout;
+ }
+
+ /*
+ * Iterate over normal data blocks
+ */
+ for (i = 0; i < EXT2_NDIR_BLOCKS ; i++, ctx.bcount++) {
+ if (inode.i_block[i] || (flags & BLOCK_FLAG_APPEND)) {
+ ret |= (*ctx.func)(fs, &inode.i_block[i],
+ ctx.bcount, 0, i, priv_data);
+ if (ret & BLOCK_ABORT)
+ goto abort_exit;
+ }
+ }
+ check_for_ro_violation_goto(&ctx, ret, abort_exit);
+ if (inode.i_block[EXT2_IND_BLOCK] || (flags & BLOCK_FLAG_APPEND)) {
+ ret |= block_iterate_ind(&inode.i_block[EXT2_IND_BLOCK],
+ 0, EXT2_IND_BLOCK, &ctx);
+ if (ret & BLOCK_ABORT)
+ goto abort_exit;
+ } else
+ ctx.bcount += limit;
+ if (inode.i_block[EXT2_DIND_BLOCK] || (flags & BLOCK_FLAG_APPEND)) {
+ ret |= block_iterate_dind(&inode.i_block[EXT2_DIND_BLOCK],
+ 0, EXT2_DIND_BLOCK, &ctx);
+ if (ret & BLOCK_ABORT)
+ goto abort_exit;
+ } else
+ ctx.bcount += limit * limit;
+ if (inode.i_block[EXT2_TIND_BLOCK] || (flags & BLOCK_FLAG_APPEND)) {
+ ret |= block_iterate_tind(&inode.i_block[EXT2_TIND_BLOCK],
+ 0, EXT2_TIND_BLOCK, &ctx);
+ if (ret & BLOCK_ABORT)
+ goto abort_exit;
+ }
+
+abort_exit:
+ if (ret & BLOCK_CHANGED) {
+ retval = ext2fs_write_inode(fs, EXT4INO, &inode);
+ if (retval) {
+ if (!block_buf)
+ ext2fs_free_mem(&ctx.ind_buf);
+ return retval;
+ }
+ }
+errout:
+ if (!block_buf)
+ ext2fs_free_mem(&ctx.ind_buf);
+
+ return (ret & BLOCK_ERROR) ? ctx.errcode : 0;
+}
+//___________________________________________________________________________________________________
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-27 02:50:28 +0000