* Copyright (C) 2000 Theodore Ts'o.
*
* Note: this uses the POSIX IO interfaces, unlike most of the other
- * functions in this library. So sue me.
+ * functions in this library. So sue me.
*
* %Begin-Header%
- * This file may be redistributed under the terms of the GNU Public
- * License.
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
* %End-Header%
*/
+#include "config.h"
#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <sys/types.h>
#endif
-#if EXT2_FLAT_INCLUDES
#include "ext2_fs.h"
-#else
-#include <linux/ext2_fs.h>
-#endif
-
#include "ext2fs.h"
+#ifndef HAVE_TYPE_SSIZE_T
+typedef int ssize_t;
+#endif
+
/*
* This function returns 1 if the specified block is all zeros
*/
{
unsigned int group, left, c, d;
char *buf, *cp;
- blk_t blk;
+ blk64_t blk;
ssize_t actual;
errcode_t retval;
+ off_t r;
buf = malloc(fs->blocksize * BUF_BLOCKS);
if (!buf)
return ENOMEM;
-
+
for (group = 0; group < fs->group_desc_count; group++) {
- blk = fs->group_desc[(unsigned)group].bg_inode_table;
- if (!blk)
- return EXT2_ET_MISSING_INODE_TABLE;
+ blk = ext2fs_inode_table_loc(fs, (unsigned)group);
+ if (!blk) {
+ retval = EXT2_ET_MISSING_INODE_TABLE;
+ goto errout;
+ }
left = fs->inode_blocks_per_group;
while (left) {
c = BUF_BLOCKS;
if (c > left)
c = left;
- retval = io_channel_read_blk(fs->io, blk, c, buf);
+ retval = io_channel_read_blk64(fs->io, blk, c, buf);
if (retval)
goto errout;
cp = buf;
blk++;
left--;
cp += fs->blocksize;
- lseek(fd, fs->blocksize, SEEK_CUR);
+ r = ext2fs_llseek(fd, fs->blocksize,
+ SEEK_CUR);
+ if (r < 0) {
+ retval = errno;
+ goto errout;
+ }
continue;
}
/* Find non-zero blocks */
retval = errno;
goto errout;
}
- if (actual != fs->blocksize * d) {
+ if (actual != (ssize_t) (fs->blocksize * d)) {
retval = EXT2_ET_SHORT_WRITE;
goto errout;
}
/*
* Read in the inode table and stuff it into place
*/
-errcode_t ext2fs_image_inode_read(ext2_filsys fs, int fd, int flags)
+errcode_t ext2fs_image_inode_read(ext2_filsys fs, int fd,
+ int flags EXT2FS_ATTR((unused)))
{
unsigned int group, c, left;
char *buf;
- blk_t blk;
+ blk64_t blk;
ssize_t actual;
errcode_t retval;
buf = malloc(fs->blocksize * BUF_BLOCKS);
if (!buf)
return ENOMEM;
-
+
for (group = 0; group < fs->group_desc_count; group++) {
- blk = fs->group_desc[(unsigned)group].bg_inode_table;
+ blk = ext2fs_inode_table_loc(fs, (unsigned)group);
if (!blk) {
retval = EXT2_ET_MISSING_INODE_TABLE;
goto errout;
retval = errno;
goto errout;
}
- if (actual != fs->blocksize * c) {
+ if (actual != (ssize_t) (fs->blocksize * c)) {
retval = EXT2_ET_SHORT_READ;
goto errout;
}
- retval = io_channel_write_blk(fs->io, blk, c, buf);
+ retval = io_channel_write_blk64(fs->io, blk, c, buf);
if (retval)
goto errout;
-
+
blk += c;
left -= c;
}
/*
* Write out superblock and group descriptors
*/
-errcode_t ext2fs_image_super_write(ext2_filsys fs, int fd, int flags)
+errcode_t ext2fs_image_super_write(ext2_filsys fs, int fd,
+ int flags EXT2FS_ATTR((unused)))
{
char *buf, *cp;
ssize_t actual;
errcode_t retval;
+#ifdef WORDS_BIGENDIAN
+ unsigned int groups_per_block;
+ struct ext2_group_desc *gdp;
+ int j;
+#endif
buf = malloc(fs->blocksize);
if (!buf)
* Write out the superblock
*/
memset(buf, 0, fs->blocksize);
+#ifdef WORDS_BIGENDIAN
+ /*
+ * We're writing out superblock so let's convert
+ * it to little endian and then back if needed
+ */
+ ext2fs_swap_super(fs->super);
+ memcpy(buf, fs->super, SUPERBLOCK_SIZE);
+ ext2fs_swap_super(fs->super);
+#else
memcpy(buf, fs->super, SUPERBLOCK_SIZE);
+#endif
actual = write(fd, buf, fs->blocksize);
if (actual == -1) {
retval = errno;
goto errout;
}
- if (actual != fs->blocksize) {
+ if (actual != (ssize_t) fs->blocksize) {
retval = EXT2_ET_SHORT_WRITE;
goto errout;
}
/*
* Now write out the block group descriptors
*/
+
cp = (char *) fs->group_desc;
+
+#ifdef WORDS_BIGENDIAN
+ /*
+ * Convert group descriptors to little endian and back
+ * if needed
+ */
+ groups_per_block = EXT2_DESC_PER_BLOCK(fs->super);
+ gdp = (struct ext2_group_desc *) cp;
+ for (j=0; j < groups_per_block*fs->desc_blocks; j++) {
+ gdp = ext2fs_group_desc(fs, fs->group_desc, j);
+ ext2fs_swap_group_desc2(fs, gdp);
+ }
+#endif
+
actual = write(fd, cp, fs->blocksize * fs->desc_blocks);
+
+
+#ifdef WORDS_BIGENDIAN
+ groups_per_block = EXT2_DESC_PER_BLOCK(fs->super);
+ gdp = (struct ext2_group_desc *) cp;
+ for (j=0; j < groups_per_block*fs->desc_blocks; j++) {
+ gdp = ext2fs_group_desc(fs, fs->group_desc, j);
+ ext2fs_swap_group_desc2(fs, gdp);
+ }
+#endif
+
if (actual == -1) {
retval = errno;
goto errout;
}
- if (actual != fs->blocksize * fs->desc_blocks) {
+ if (actual != (ssize_t) (fs->blocksize * fs->desc_blocks)) {
retval = EXT2_ET_SHORT_WRITE;
goto errout;
}
-
+
retval = 0;
errout:
/*
* Read the superblock and group descriptors and overwrite them.
*/
-errcode_t ext2fs_image_super_read(ext2_filsys fs, int fd, int flags)
+errcode_t ext2fs_image_super_read(ext2_filsys fs, int fd,
+ int flags EXT2FS_ATTR((unused)))
{
char *buf;
ssize_t actual, size;
*/
errcode_t ext2fs_image_bitmap_write(ext2_filsys fs, int fd, int flags)
{
- char *ptr;
- int c, size;
- char zero_buf[1024];
- ssize_t actual;
- errcode_t retval;
+ ext2fs_generic_bitmap bmap;
+ errcode_t retval;
+ ssize_t actual;
+ size_t c;
+ __u64 itr, cnt, size, total_size;
+ char buf[1024];
if (flags & IMAGER_FLAG_INODEMAP) {
if (!fs->inode_map) {
if (retval)
return retval;
}
- ptr = fs->inode_map->bitmap;
- size = ((EXT2_INODES_PER_GROUP(fs->super)+7) / 8);
+ bmap = fs->inode_map;
+ itr = 1;
+ cnt = EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count;
+ size = (EXT2_INODES_PER_GROUP(fs->super) / 8);
} else {
if (!fs->block_map) {
retval = ext2fs_read_block_bitmap(fs);
if (retval)
return retval;
}
- ptr = fs->block_map->bitmap;
- size = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
+ bmap = fs->block_map;
+ itr = fs->super->s_first_data_block;
+ cnt = EXT2_GROUPS_TO_CLUSTERS(fs->super, fs->group_desc_count);
+ size = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
}
-
- actual = write(fd, ptr, size);
- if (actual == -1) {
- retval = errno;
- goto errout;
+ total_size = size * fs->group_desc_count;
+
+ while (cnt > 0) {
+ size = sizeof(buf);
+ if (size > (cnt >> 3))
+ size = (cnt >> 3);
+
+ retval = ext2fs_get_generic_bmap_range(bmap, itr,
+ size << 3, buf);
+ if (retval)
+ return retval;
+
+ actual = write(fd, buf, size);
+ if (actual == -1)
+ return errno;
+ if (actual != (int) size)
+ return EXT2_ET_SHORT_READ;
+
+ itr += size << 3;
+ cnt -= size << 3;
}
- if (actual != size) {
- retval = EXT2_ET_SHORT_WRITE;
- goto errout;
- }
- size = size % fs->blocksize;
- memset(zero_buf, 0, sizeof(zero_buf));
+
+ size = total_size % fs->blocksize;
+ memset(buf, 0, sizeof(buf));
if (size) {
size = fs->blocksize - size;
while (size) {
c = size;
- if (c > sizeof(zero_buf))
- c = sizeof(zero_buf);
- actual = write(fd, zero_buf, c);
- if (actual == -1) {
- retval = errno;
- goto errout;
- }
- if (actual != c) {
- retval = EXT2_ET_SHORT_WRITE;
- goto errout;
- }
+ if (c > (int) sizeof(buf))
+ c = sizeof(buf);
+ actual = write(fd, buf, c);
+ if (actual < 0)
+ return errno;
+ if ((size_t) actual != c)
+ return EXT2_ET_SHORT_WRITE;
size -= c;
}
}
- retval = 0;
-errout:
- return (retval);
+ return 0;
}
*/
errcode_t ext2fs_image_bitmap_read(ext2_filsys fs, int fd, int flags)
{
- char *ptr, *buf = 0;
- int size;
- ssize_t actual;
- errcode_t retval;
+ ext2fs_generic_bitmap bmap;
+ errcode_t retval;
+ __u64 itr, cnt;
+ char buf[1024];
+ unsigned int size;
+ ssize_t actual;
if (flags & IMAGER_FLAG_INODEMAP) {
if (!fs->inode_map) {
if (retval)
return retval;
}
- ptr = fs->inode_map->bitmap;
- size = ((EXT2_INODES_PER_GROUP(fs->super)+7) / 8);
+ bmap = fs->inode_map;
+ itr = 1;
+ cnt = EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count;
+ size = (EXT2_INODES_PER_GROUP(fs->super) / 8);
} else {
if (!fs->block_map) {
retval = ext2fs_read_block_bitmap(fs);
if (retval)
return retval;
}
- ptr = fs->block_map->bitmap;
+ bmap = fs->block_map;
+ itr = fs->super->s_first_data_block;
+ cnt = EXT2_GROUPS_TO_BLOCKS(fs->super, fs->group_desc_count);
size = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
}
- buf = malloc(size);
- if (!buf)
- return ENOMEM;
+ while (cnt > 0) {
+ size = sizeof(buf);
+ if (size > (cnt >> 3))
+ size = (cnt >> 3);
- actual = read(fd, buf, size);
- if (actual == -1) {
- retval = errno;
- goto errout;
- }
- if (actual != size) {
- retval = EXT2_ET_SHORT_WRITE;
- goto errout;
+ actual = read(fd, buf, size);
+ if (actual == -1)
+ return errno;
+ if (actual != (int) size)
+ return EXT2_ET_SHORT_READ;
+
+ retval = ext2fs_set_generic_bmap_range(bmap, itr,
+ size << 3, buf);
+ if (retval)
+ return retval;
+
+ itr += size << 3;
+ cnt -= size << 3;
}
- memcpy(ptr, buf, size);
-
- retval = 0;
-errout:
- if (buf)
- free(buf);
- return (retval);
+ return 0;
}
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff