* %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) ||
+ if (!ext2fs_has_feature_meta_bg(fs->super) ||
(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,
manager, ret_fs);
}
+static void block_sha_map_free_entry(void *data)
+{
+ free(data);
+ return;
+}
+
/*
* 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.
* 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,
errcode_t retval;
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;
+ unsigned int inode_size;
+ __u64 groups_cnt;
#ifdef WORDS_BIGENDIAN
+ unsigned int groups_per_block;
struct ext2_group_desc *gdp;
int j;
#endif
+ char *time_env;
+ int csum_retries = 0;
EXT2_CHECK_MAGIC(manager, EXT2_ET_MAGIC_IO_MANAGER);
/* don't overwrite sb backups unless flag is explicitly cleared */
fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
fs->umask = 022;
+
+ time_env = getenv("E2FSPROGS_FAKE_TIME");
+ if (time_env)
+ fs->now = strtoul(time_env, NULL, 0);
+
retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name);
if (retval)
goto cleanup;
io_flags |= IO_FLAG_EXCLUSIVE;
if (flags & EXT2_FLAG_DIRECT_IO)
io_flags |= IO_FLAG_DIRECT_IO;
+ if (flags & EXT2_FLAG_THREADS)
+ io_flags |= IO_FLAG_THREADS;
retval = manager->open(fs->device_name, io_flags, &fs->io);
if (retval)
goto cleanup;
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) {
fs->image_header);
if (retval)
goto cleanup;
- if (fs->image_header->magic_number != EXT2_ET_MAGIC_E2IMAGE)
+ if (ext2fs_le32_to_cpu(fs->image_header->magic_number) != EXT2_ET_MAGIC_E2IMAGE)
return EXT2_ET_MAGIC_E2IMAGE;
superblock = 1;
- block_size = fs->image_header->fs_blocksize;
+ block_size = ext2fs_le32_to_cpu(fs->image_header->fs_blocksize);
}
/*
if (retval)
goto cleanup;
}
+retry:
retval = io_channel_read_blk(fs->io, superblock, -SUPERBLOCK_SIZE,
fs->super);
if (retval)
if (fs->orig_super)
memcpy(fs->orig_super, fs->super, SUPERBLOCK_SIZE);
+ if (!(fs->flags & EXT2_FLAG_IGNORE_CSUM_ERRORS)) {
+ retval = 0;
+ if (!ext2fs_verify_csum_type(fs, fs->super))
+ retval = EXT2_ET_UNKNOWN_CSUM;
+ if (!ext2fs_superblock_csum_verify(fs, fs->super)) {
+ if (csum_retries++ < 3)
+ goto retry;
+ retval = EXT2_ET_SB_CSUM_INVALID;
+ }
+ }
+
#ifdef WORDS_BIGENDIAN
fs->flags |= EXT2_FLAG_SWAP_BYTES;
ext2fs_swap_super(fs->super);
}
#endif
- if (fs->super->s_magic != EXT2_SUPER_MAGIC) {
+ if (fs->super->s_magic != EXT2_SUPER_MAGIC)
retval = EXT2_ET_BAD_MAGIC;
+ if (retval)
goto cleanup;
- }
+
if (fs->super->s_rev_level > EXT2_LIB_CURRENT_REV) {
retval = EXT2_ET_REV_TOO_HIGH;
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)) {
}
if (!(flags & EXT2_FLAG_JOURNAL_DEV_OK) &&
- (fs->super->s_feature_incompat &
- EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
+ ext2fs_has_feature_journal_dev(fs->super)) {
retval = EXT2_ET_UNSUPP_FEATURE;
goto cleanup;
}
}
- if ((fs->super->s_log_block_size + EXT2_MIN_BLOCK_LOG_SIZE) >
- EXT2_MAX_BLOCK_LOG_SIZE) {
+ if ((fs->super->s_log_block_size >
+ (unsigned) (EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE)) ||
+ (fs->super->s_log_cluster_size >
+ (unsigned) (EXT2_MAX_CLUSTER_LOG_SIZE - EXT2_MIN_CLUSTER_LOG_SIZE)) ||
+ (fs->super->s_log_block_size > fs->super->s_log_cluster_size) ||
+ (fs->super->s_log_groups_per_flex > 31)) {
retval = EXT2_ET_CORRUPT_SUPERBLOCK;
goto cleanup;
}
- fs->blocksize = EXT2_BLOCK_SIZE(fs->super);
- if (EXT2_INODE_SIZE(fs->super) < EXT2_GOOD_OLD_INODE_SIZE) {
+
+ /*
+ * bigalloc requires cluster-aware bitfield operations, which at the
+ * moment means we need EXT2_FLAG_64BITS.
+ */
+ if (ext2fs_has_feature_bigalloc(fs->super) &&
+ !(flags & EXT2_FLAG_64BITS)) {
+ retval = EXT2_ET_CANT_USE_LEGACY_BITMAPS;
+ goto cleanup;
+ }
+
+ if (!ext2fs_has_feature_bigalloc(fs->super) &&
+ (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);
+ inode_size = EXT2_INODE_SIZE(fs->super);
+ if ((inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
+ (inode_size > fs->blocksize) ||
+ (inode_size & (inode_size - 1))) {
+ retval = EXT2_ET_CORRUPT_SUPERBLOCK;
+ goto cleanup;
+ }
+
+ /* Enforce the block group descriptor size */
+ if (!(flags & EXT2_FLAG_IGNORE_SB_ERRORS) &&
+ ext2fs_has_feature_64bit(fs->super)) {
+ unsigned desc_size = fs->super->s_desc_size;
+
+ if ((desc_size < EXT2_MIN_DESC_SIZE_64BIT) ||
+ (desc_size > EXT2_MAX_DESC_SIZE) ||
+ (desc_size & (desc_size - 1)) != 0) {
+ retval = EXT2_ET_BAD_DESC_SIZE;
+ goto cleanup;
+ }
+ }
+
+ 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->fragsize = EXT2_FRAG_SIZE(fs->super);
fs->inode_blocks_per_group = ((EXT2_INODES_PER_GROUP(fs->super) *
EXT2_INODE_SIZE(fs->super) +
EXT2_BLOCK_SIZE(fs->super) - 1) /
* 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) {
+ if (ext2fs_has_feature_journal_dev(fs->super)) {
fs->group_desc_count = 0;
*ret_fs = fs;
return 0;
retval = EXT2_ET_CORRUPT_SUPERBLOCK;
goto cleanup;
}
+ /* Precompute the FS UUID to seed other checksums */
+ ext2fs_init_csum_seed(fs);
/*
* Read group descriptors
blocks_per_group > EXT2_MAX_BLOCKS_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 >= fs->super->s_blocks_count) {
+ fs->super->s_first_data_block >= ext2fs_blocks_count(fs->super)) {
+ retval = EXT2_ET_CORRUPT_SUPERBLOCK;
+ goto cleanup;
+ }
+ groups_cnt = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
+ fs->super->s_first_data_block,
+ blocks_per_group);
+ if (groups_cnt >> 32) {
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);
- if (fs->group_desc_count * EXT2_INODES_PER_GROUP(fs->super) !=
- fs->super->s_inodes_count) {
- retval = EXT2_ET_CORRUPT_SUPERBLOCK;
+ fs->group_desc_count = groups_cnt;
+ if (!(flags & EXT2_FLAG_IGNORE_SB_ERRORS) &&
+ (__u64)fs->group_desc_count * EXT2_INODES_PER_GROUP(fs->super) !=
+ fs->super->s_inodes_count) {
+ retval = EXT2_ET_CORRUPT_SUPERBLOCK;
goto cleanup;
- }
+ }
fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
EXT2_DESC_PER_BLOCK(fs->super));
+ if (ext2fs_has_feature_meta_bg(fs->super) &&
+ (fs->super->s_first_meta_bg > fs->desc_blocks) &&
+ !(flags & EXT2_FLAG_IGNORE_SB_ERRORS)) {
+ retval = EXT2_ET_CORRUPT_SUPERBLOCK;
+ goto cleanup;
+ }
+ if (flags & EXT2_FLAG_SUPER_ONLY)
+ goto skip_read_bg;
retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
&fs->group_desc);
if (retval)
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);
- if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
+#endif
+ if (ext2fs_has_feature_meta_bg(fs->super) &&
+ !(flags & EXT2_FLAG_IMAGE_FILE)) {
first_meta_bg = fs->super->s_first_meta_bg;
- else
+ if (first_meta_bg > fs->desc_blocks)
+ first_meta_bg = fs->desc_blocks;
+ } else
first_meta_bg = fs->desc_blocks;
if (first_meta_bg) {
- retval = io_channel_read_blk(fs->io, group_block+1,
+ 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*first_meta_bg; 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);
+ if (gdp)
+ 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);
+ io_channel_cache_readahead(fs->io, blk, 1);
+ }
+
for (i=first_meta_bg ; i < fs->desc_blocks; i++) {
- blk = ext2fs_descriptor_block_loc(fs, group_block, i);
- retval = io_channel_read_blk(fs->io, blk, 1, dest);
+ 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
- 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; j++) {
+ gdp = ext2fs_group_desc(fs, fs->group_desc,
+ i * groups_per_block + j);
+ if (gdp)
+ ext2fs_swap_group_desc2(fs, gdp);
+ }
#endif
dest += fs->blocksize;
}
* If recovery is from backup superblock, Clear _UNININT flags &
* reset bg_itable_unused to zero
*/
- 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;
+ if (superblock > 1 && ext2fs_has_group_desc_csum(fs)) {
+ 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);
+ }
+skip_read_bg:
+ if (ext2fs_has_feature_mmp(fs->super) &&
+ !(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;
+ }
+ }
+
+ if (fs->flags & EXT2_FLAG_SHARE_DUP) {
+ fs->block_sha_map = ext2fs_hashmap_create(ext2fs_djb2_hash,
+ block_sha_map_free_entry, 4096);
+ if (!fs->block_sha_map) {
+ retval = EXT2_ET_NO_MEMORY;
+ goto cleanup;
}
- ext2fs_mark_super_dirty(fs);
+ ext2fs_set_feature_shared_blocks(fs->super);
}
+ if (ext2fs_has_feature_casefold(fs->super))
+ fs->encoding = ext2fs_load_nls_table(fs->super->s_encoding);
+
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;
}
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 |
EXT2_FLAG_BB_DIRTY | EXT2_FLAG_IB_DIRTY;
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff