/*
* 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.
+ * 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
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
+#ifdef HAVE_ERRNO_H
+#include <errno.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)
+blk64_t ext2fs_descriptor_block_loc2(ext2_filsys fs, blk64_t group_block,
+ dgrp_t i)
{
int bg;
- int has_super = 0;
- int ret_blk;
+ int has_super = 0, group_zero_adjust = 0;
+ blk64_t ret_blk;
+
+ /*
+ * On a bigalloc FS with 1K blocks, block 0 is reserved for non-ext4
+ * stuff, so adjust for that if we're being asked for group 0.
+ */
+ if (i == 0 && fs->blocksize == 1024 && EXT2FS_CLUSTER_RATIO(fs) > 1)
+ group_zero_adjust = 1;
if (!(fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) ||
(i < fs->super->s_first_meta_bg))
- return (group_block + i + 1);
+ return group_block + i + 1 + group_zero_adjust;
bg = EXT2_DESC_PER_BLOCK(fs->super) * i;
if (ext2fs_bg_has_super(fs, bg))
has_super = 1;
- ret_blk = ext2fs_group_first_block(fs, bg) + has_super;
+ ret_blk = ext2fs_group_first_block2(fs, bg);
/*
* If group_block is not the normal value, we're trying to use
* the backup group descriptors and superblock --- so use the
* 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 + has_super + fs->super->s_blocks_per_group) <
+ ext2fs_blocks_count(fs->super))) {
ret_blk += fs->super->s_blocks_per_group;
- return ret_blk;
+
+ /*
+ * If we're going to jump forward a block group, make sure
+ * that we adjust has_super to account for the next group's
+ * backup superblock (or lack thereof).
+ */
+ if (ext2fs_bg_has_super(fs, bg + 1))
+ has_super = 1;
+ else
+ has_super = 0;
+ }
+ return ret_blk + has_super + group_zero_adjust;
+}
+
+blk_t ext2fs_descriptor_block_loc(ext2_filsys fs, blk_t group_block, dgrp_t i)
+{
+ return ext2fs_descriptor_block_loc2(fs, group_block, i);
}
errcode_t ext2fs_open(const char *name, int flags, int superblock,
- unsigned int block_size, io_manager manager,
+ unsigned int block_size, io_manager manager,
ext2_filsys *ret_fs)
{
- return ext2fs_open2(name, 0, flags, superblock, block_size,
+ return ext2fs_open2(name, 0, flags, superblock, block_size,
manager, ret_fs);
}
* 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
+ * EXT2_FLAG_SKIP_MMP - Open without multi-mount protection check.
+ * EXT2_FLAG_64BITS - Allow 64-bit bitfields (needed for large
+ * filesystems)
*/
errcode_t ext2fs_open2(const char *name, const char *io_options,
int flags, int superblock,
- unsigned int block_size, io_manager manager,
+ unsigned int block_size, io_manager manager,
ext2_filsys *ret_fs)
{
ext2_filsys fs;
errcode_t retval;
- unsigned long i;
+ unsigned long i, first_meta_bg;
__u32 features;
- int groups_per_block, blocks_per_group, io_flags;
- blk_t group_block, blk;
+ unsigned int blocks_per_group, io_flags;
+ blk64_t group_block, blk;
char *dest, *cp;
+ int group_zero_adjust = 0;
#ifdef WORDS_BIGENDIAN
+ unsigned int groups_per_block;
struct ext2_group_desc *gdp;
int j;
#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;
*cp++ = 0;
io_options = cp;
}
-
+
io_flags = 0;
if (flags & EXT2_FLAG_RW)
io_flags |= IO_FLAG_RW;
if (flags & EXT2_FLAG_EXCLUSIVE)
io_flags |= IO_FLAG_EXCLUSIVE;
+ if (flags & EXT2_FLAG_DIRECT_IO)
+ io_flags |= IO_FLAG_DIRECT_IO;
retval = manager->open(fs->device_name, io_flags, &fs->io);
if (retval)
goto cleanup;
- if (io_options &&
+ 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);
+ retval = io_channel_alloc_buf(fs->io, -SUPERBLOCK_SIZE, &fs->super);
if (retval)
goto cleanup;
if (flags & EXT2_FLAG_IMAGE_FILE) {
goto cleanup;
}
#endif
-
+
if (fs->super->s_magic != EXT2_SUPER_MAGIC) {
retval = EXT2_ET_BAD_MAGIC;
goto cleanup;
features = fs->super->s_feature_incompat;
#ifdef EXT2_LIB_SOFTSUPP_INCOMPAT
if (flags & EXT2_FLAG_SOFTSUPP_FEATURES)
- features &= !EXT2_LIB_SOFTSUPP_INCOMPAT;
+ features &= ~EXT2_LIB_SOFTSUPP_INCOMPAT;
#endif
if (features & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) {
retval = EXT2_ET_UNSUPP_FEATURE;
features = fs->super->s_feature_ro_compat;
#ifdef EXT2_LIB_SOFTSUPP_RO_COMPAT
if (flags & EXT2_FLAG_SOFTSUPP_FEATURES)
- features &= !EXT2_LIB_SOFTSUPP_RO_COMPAT;
+ features &= ~EXT2_LIB_SOFTSUPP_RO_COMPAT;
#endif
if ((flags & EXT2_FLAG_RW) &&
(features & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP)) {
goto cleanup;
}
}
-
+
if ((fs->super->s_log_block_size + EXT2_MIN_BLOCK_LOG_SIZE) >
EXT2_MAX_BLOCK_LOG_SIZE) {
retval = EXT2_ET_CORRUPT_SUPERBLOCK;
goto cleanup;
}
- fs->blocksize = EXT2_BLOCK_SIZE(fs->super);
+
+ /*
+ * bigalloc requires cluster-aware bitfield operations, which at the
+ * moment means we need EXT2_FLAG_64BITS.
+ */
+ if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
+ !(flags & EXT2_FLAG_64BITS)) {
+ retval = EXT2_ET_CANT_USE_LEGACY_BITMAPS;
+ goto cleanup;
+ }
+
+ if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
+ (fs->super->s_log_block_size != fs->super->s_log_cluster_size)) {
+ retval = EXT2_ET_CORRUPT_SUPERBLOCK;
+ goto cleanup;
+ }
+ fs->fragsize = fs->blocksize = EXT2_BLOCK_SIZE(fs->super);
if (EXT2_INODE_SIZE(fs->super) < EXT2_GOOD_OLD_INODE_SIZE) {
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 *
+ fs->cluster_ratio_bits = fs->super->s_log_cluster_size -
+ fs->super->s_log_block_size;
+ if (EXT2_BLOCKS_PER_GROUP(fs->super) !=
+ EXT2_CLUSTERS_PER_GROUP(fs->super) << fs->cluster_ratio_bits) {
+ retval = EXT2_ET_CORRUPT_SUPERBLOCK;
+ goto cleanup;
+ }
+ fs->inode_blocks_per_group = ((EXT2_INODES_PER_GROUP(fs->super) *
EXT2_INODE_SIZE(fs->super) +
EXT2_BLOCK_SIZE(fs->super) - 1) /
EXT2_BLOCK_SIZE(fs->super));
*ret_fs = fs;
return 0;
}
-
+
+ if (EXT2_INODES_PER_GROUP(fs->super) == 0) {
+ retval = EXT2_ET_CORRUPT_SUPERBLOCK;
+ goto cleanup;
+ }
+
/*
* 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)) {
+ fs->inode_blocks_per_group > EXT2_MAX_INODES_PER_GROUP(fs->super) ||
+ EXT2_DESC_PER_BLOCK(fs->super) == 0 ||
+ fs->super->s_first_data_block >= ext2fs_blocks_count(fs->super)) {
+ retval = EXT2_ET_CORRUPT_SUPERBLOCK;
+ goto cleanup;
+ }
+ fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
+ fs->super->s_first_data_block,
+ blocks_per_group);
+ if (fs->group_desc_count * EXT2_INODES_PER_GROUP(fs->super) !=
+ fs->super->s_inodes_count) {
retval = EXT2_ET_CORRUPT_SUPERBLOCK;
goto cleanup;
}
- fs->group_desc_count = ext2fs_div_ceil(fs->super->s_blocks_count -
- fs->super->s_first_data_block,
- blocks_per_group);
fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
EXT2_DESC_PER_BLOCK(fs->super));
retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
goto cleanup;
if (!group_block)
group_block = fs->super->s_first_data_block;
+ /*
+ * On a FS with a 1K blocksize, block 0 is reserved for bootloaders
+ * so we must increment block numbers to any group 0 items.
+ *
+ * However, we cannot touch group_block directly because in the meta_bg
+ * case, the ext2fs_descriptor_block_loc2() function will interpret
+ * group_block != s_first_data_block to mean that we want to access the
+ * backup group descriptors. This is not what we want if the caller
+ * set superblock == 0 (i.e. auto-detect the superblock), which is
+ * what's going on here.
+ */
+ if (group_block == 0 && fs->blocksize == 1024)
+ group_zero_adjust = 1;
dest = (char *) fs->group_desc;
+#ifdef WORDS_BIGENDIAN
groups_per_block = EXT2_DESC_PER_BLOCK(fs->super);
- 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);
+#endif
+ if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
+ first_meta_bg = fs->super->s_first_meta_bg;
+ else
+ first_meta_bg = fs->desc_blocks;
+ if (first_meta_bg) {
+ retval = io_channel_read_blk(fs->io, group_block +
+ group_zero_adjust + 1,
+ first_meta_bg, dest);
if (retval)
goto cleanup;
#ifdef WORDS_BIGENDIAN
gdp = (struct ext2_group_desc *) dest;
- for (j=0; j < groups_per_block; j++)
- ext2fs_swap_group_desc(gdp++);
+ for (j=0; j < groups_per_block*first_meta_bg; j++) {
+ gdp = ext2fs_group_desc(fs, fs->group_desc, j);
+ ext2fs_swap_group_desc2(fs, gdp);
+ }
+#endif
+ dest += fs->blocksize*first_meta_bg;
+ }
+ for (i=first_meta_bg ; i < fs->desc_blocks; i++) {
+ blk = ext2fs_descriptor_block_loc2(fs, group_block, i);
+ retval = io_channel_read_blk64(fs->io, blk, 1, dest);
+ if (retval)
+ goto cleanup;
+#ifdef WORDS_BIGENDIAN
+ for (j=0; j < groups_per_block; j++) {
+ gdp = ext2fs_group_desc(fs, fs->group_desc,
+ i * groups_per_block + j);
+ ext2fs_swap_group_desc2(fs, gdp);
+ }
#endif
dest += fs->blocksize;
}
*/
if (superblock > 1 && EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
- struct ext2_group_desc *gd;
- for (i = 0, gd = fs->group_desc; i < fs->group_desc_count;
- i++, gd++) {
- gd->bg_flags &= ~EXT2_BG_BLOCK_UNINIT;
- gd->bg_flags &= ~EXT2_BG_INODE_UNINIT;
- gd->bg_itable_unused = 0;
+ dgrp_t group;
+
+ for (group = 0; group < fs->group_desc_count; group++) {
+ ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
+ ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT);
+ ext2fs_bg_itable_unused_set(fs, group, 0);
+ /* The checksum will be reset later, but fix it here
+ * anyway to avoid printing a lot of spurious errors. */
+ ext2fs_group_desc_csum_set(fs, group);
+ }
+ if (fs->flags & EXT2_FLAG_RW)
+ ext2fs_mark_super_dirty(fs);
+ }
+
+ if ((fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_MMP) &&
+ !(flags & EXT2_FLAG_SKIP_MMP) &&
+ (flags & (EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE))) {
+ retval = ext2fs_mmp_start(fs);
+ if (retval) {
+ fs->flags |= EXT2_FLAG_SKIP_MMP; /* just do cleanup */
+ ext2fs_mmp_stop(fs);
+ goto cleanup;
}
- ext2fs_mark_super_dirty(fs);
}
fs->flags &= ~EXT2_FLAG_NOFREE_ON_ERROR;
*ret_fs = fs;
+
return 0;
cleanup:
- if (flags & EXT2_FLAG_NOFREE_ON_ERROR)
- *ret_fs = fs;
- else
+ if (!(flags & EXT2_FLAG_NOFREE_ON_ERROR)) {
ext2fs_free(fs);
+ fs = NULL;
+ }
+ *ret_fs = 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)
errcode_t ext2fs_rewrite_to_io(ext2_filsys fs, io_channel new_io)
{
+ errcode_t err;
+
if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0)
return EXT2_ET_NOT_IMAGE_FILE;
+ err = io_channel_set_blksize(new_io, fs->blocksize);
+ if (err)
+ return err;
+ if ((new_io == fs->image_io) || (new_io == fs->io))
+ return 0;
+ if ((fs->image_io != fs->io) &&
+ fs->image_io)
+ io_channel_close(fs->image_io);
+ if (fs->io)
+ io_channel_close(fs->io);
fs->io = fs->image_io = new_io;
- fs->flags |= EXT2_FLAG_DIRTY | EXT2_FLAG_RW |
+ fs->flags |= EXT2_FLAG_DIRTY | EXT2_FLAG_RW |
EXT2_FLAG_BB_DIRTY | EXT2_FLAG_IB_DIRTY;
fs->flags &= ~EXT2_FLAG_IMAGE_FILE;
return 0;
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff