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Diffstat (limited to 'e2fsprogs/ext2fs/bmap.c')
-rw-r--r--e2fsprogs/ext2fs/bmap.c264
1 files changed, 0 insertions, 264 deletions
diff --git a/e2fsprogs/ext2fs/bmap.c b/e2fsprogs/ext2fs/bmap.c
deleted file mode 100644
index b22fe3d..0000000
--- a/e2fsprogs/ext2fs/bmap.c
+++ /dev/null
@@ -1,264 +0,0 @@
-/* vi: set sw=4 ts=4: */
-/*
- * bmap.c --- logical to physical block mapping
- *
- * Copyright (C) 1997 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 "ext2_fs.h"
-#include "ext2fs.h"
-
-extern errcode_t ext2fs_bmap(ext2_filsys fs, ext2_ino_t ino,
- struct ext2_inode *inode,
- char *block_buf, int bmap_flags,
- blk_t block, blk_t *phys_blk);
-
-#define inode_bmap(inode, nr) ((inode)->i_block[(nr)])
-
-static errcode_t block_ind_bmap(ext2_filsys fs, int flags,
- blk_t ind, char *block_buf,
- int *blocks_alloc,
- blk_t nr, blk_t *ret_blk)
-{
- errcode_t retval;
- blk_t b;
-
- if (!ind) {
- if (flags & BMAP_SET)
- return EXT2_ET_SET_BMAP_NO_IND;
- *ret_blk = 0;
- return 0;
- }
- retval = io_channel_read_blk(fs->io, ind, 1, block_buf);
- if (retval)
- return retval;
-
- if (flags & BMAP_SET) {
- b = *ret_blk;
-#if BB_BIG_ENDIAN
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE))
- b = ext2fs_swab32(b);
-#endif
- ((blk_t *) block_buf)[nr] = b;
- return io_channel_write_blk(fs->io, ind, 1, block_buf);
- }
-
- b = ((blk_t *) block_buf)[nr];
-
-#if BB_BIG_ENDIAN
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
- b = ext2fs_swab32(b);
-#endif
-
- if (!b && (flags & BMAP_ALLOC)) {
- b = nr ? ((blk_t *) block_buf)[nr-1] : 0;
- retval = ext2fs_alloc_block(fs, b,
- block_buf + fs->blocksize, &b);
- if (retval)
- return retval;
-
-#if BB_BIG_ENDIAN
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE))
- ((blk_t *) block_buf)[nr] = ext2fs_swab32(b);
- else
-#endif
- ((blk_t *) block_buf)[nr] = b;
-
- retval = io_channel_write_blk(fs->io, ind, 1, block_buf);
- if (retval)
- return retval;
-
- (*blocks_alloc)++;
- }
-
- *ret_blk = b;
- return 0;
-}
-
-static errcode_t block_dind_bmap(ext2_filsys fs, int flags,
- blk_t dind, char *block_buf,
- int *blocks_alloc,
- blk_t nr, blk_t *ret_blk)
-{
- blk_t b;
- errcode_t retval;
- blk_t addr_per_block;
-
- addr_per_block = (blk_t) fs->blocksize >> 2;
-
- retval = block_ind_bmap(fs, flags & ~BMAP_SET, dind, block_buf,
- blocks_alloc, nr / addr_per_block, &b);
- if (retval)
- return retval;
- retval = block_ind_bmap(fs, flags, b, block_buf, blocks_alloc,
- nr % addr_per_block, ret_blk);
- return retval;
-}
-
-static errcode_t block_tind_bmap(ext2_filsys fs, int flags,
- blk_t tind, char *block_buf,
- int *blocks_alloc,
- blk_t nr, blk_t *ret_blk)
-{
- blk_t b;
- errcode_t retval;
- blk_t addr_per_block;
-
- addr_per_block = (blk_t) fs->blocksize >> 2;
-
- retval = block_dind_bmap(fs, flags & ~BMAP_SET, tind, block_buf,
- blocks_alloc, nr / addr_per_block, &b);
- if (retval)
- return retval;
- retval = block_ind_bmap(fs, flags, b, block_buf, blocks_alloc,
- nr % addr_per_block, ret_blk);
- return retval;
-}
-
-errcode_t ext2fs_bmap(ext2_filsys fs, ext2_ino_t ino, struct ext2_inode *inode,
- char *block_buf, int bmap_flags, blk_t block,
- blk_t *phys_blk)
-{
- struct ext2_inode inode_buf;
- blk_t addr_per_block;
- blk_t b;
- char *buf = 0;
- errcode_t retval = 0;
- int blocks_alloc = 0, inode_dirty = 0;
-
- if (!(bmap_flags & BMAP_SET))
- *phys_blk = 0;
-
- /* Read inode structure if necessary */
- if (!inode) {
- retval = ext2fs_read_inode(fs, ino, &inode_buf);
- if (retval)
- return retval;
- inode = &inode_buf;
- }
- addr_per_block = (blk_t) fs->blocksize >> 2;
-
- if (!block_buf) {
- retval = ext2fs_get_mem(fs->blocksize * 2, &buf);
- if (retval)
- return retval;
- block_buf = buf;
- }
-
- if (block < EXT2_NDIR_BLOCKS) {
- if (bmap_flags & BMAP_SET) {
- b = *phys_blk;
-#if BB_BIG_ENDIAN
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
- b = ext2fs_swab32(b);
-#endif
- inode_bmap(inode, block) = b;
- inode_dirty++;
- goto done;
- }
-
- *phys_blk = inode_bmap(inode, block);
- b = block ? inode_bmap(inode, block-1) : 0;
-
- if ((*phys_blk == 0) && (bmap_flags & BMAP_ALLOC)) {
- retval = ext2fs_alloc_block(fs, b, block_buf, &b);
- if (retval)
- goto done;
- inode_bmap(inode, block) = b;
- blocks_alloc++;
- *phys_blk = b;
- }
- goto done;
- }
-
- /* Indirect block */
- block -= EXT2_NDIR_BLOCKS;
- if (block < addr_per_block) {
- b = inode_bmap(inode, EXT2_IND_BLOCK);
- if (!b) {
- if (!(bmap_flags & BMAP_ALLOC)) {
- if (bmap_flags & BMAP_SET)
- retval = EXT2_ET_SET_BMAP_NO_IND;
- goto done;
- }
-
- b = inode_bmap(inode, EXT2_IND_BLOCK-1);
- retval = ext2fs_alloc_block(fs, b, block_buf, &b);
- if (retval)
- goto done;
- inode_bmap(inode, EXT2_IND_BLOCK) = b;
- blocks_alloc++;
- }
- retval = block_ind_bmap(fs, bmap_flags, b, block_buf,
- &blocks_alloc, block, phys_blk);
- goto done;
- }
-
- /* Doubly indirect block */
- block -= addr_per_block;
- if (block < addr_per_block * addr_per_block) {
- b = inode_bmap(inode, EXT2_DIND_BLOCK);
- if (!b) {
- if (!(bmap_flags & BMAP_ALLOC)) {
- if (bmap_flags & BMAP_SET)
- retval = EXT2_ET_SET_BMAP_NO_IND;
- goto done;
- }
-
- b = inode_bmap(inode, EXT2_IND_BLOCK);
- retval = ext2fs_alloc_block(fs, b, block_buf, &b);
- if (retval)
- goto done;
- inode_bmap(inode, EXT2_DIND_BLOCK) = b;
- blocks_alloc++;
- }
- retval = block_dind_bmap(fs, bmap_flags, b, block_buf,
- &blocks_alloc, block, phys_blk);
- goto done;
- }
-
- /* Triply indirect block */
- block -= addr_per_block * addr_per_block;
- b = inode_bmap(inode, EXT2_TIND_BLOCK);
- if (!b) {
- if (!(bmap_flags & BMAP_ALLOC)) {
- if (bmap_flags & BMAP_SET)
- retval = EXT2_ET_SET_BMAP_NO_IND;
- goto done;
- }
-
- b = inode_bmap(inode, EXT2_DIND_BLOCK);
- retval = ext2fs_alloc_block(fs, b, block_buf, &b);
- if (retval)
- goto done;
- inode_bmap(inode, EXT2_TIND_BLOCK) = b;
- blocks_alloc++;
- }
- retval = block_tind_bmap(fs, bmap_flags, b, block_buf,
- &blocks_alloc, block, phys_blk);
-done:
- ext2fs_free_mem(&buf);
- if ((retval == 0) && (blocks_alloc || inode_dirty)) {
- inode->i_blocks += (blocks_alloc * fs->blocksize) / 512;
- retval = ext2fs_write_inode(fs, ino, inode);
- }
- return retval;
-}
-
-
-
generated by cgit v1.1 at 2024-11-07 05:58:14 +0000