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e2fsprogs/e2fsck/super.c
Jan Kara 0feae066df e2fsck: report only one sb corruption 
check_super_value() does not terminate in case of error anymore since
c8b20b40eb "misc: add plausibility checks to
debugfs/tune2fs/dumpe2fs/e2fsck" which removed the PR_FATAL flag from
PR_0_SB_CORRUPT problem. This results in potentially many errors for
superblock being printed including the long message about how to deal
with corrupted superblock. Restore the original behavior of reporting
only one error and also remove the comments 'never get here' as they are
not true anymore.

Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2018-06-19 11:34:46 -04:00

1168 lines
34 KiB
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/*
* e2fsck.c - superblock checks
*
* Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include "config.h"
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifndef EXT2_SKIP_UUID
#include "uuid/uuid.h"
#endif
#include "e2fsck.h"
#include "problem.h"
#define MIN_CHECK 1
#define MAX_CHECK 2
#define LOG2_CHECK 4
static int check_super_value(e2fsck_t ctx, const char *descr,
unsigned long value, int flags,
unsigned long min_val, unsigned long max_val)
{
struct problem_context pctx;
if ((flags & MIN_CHECK && value < min_val) ||
(flags & MAX_CHECK && value > max_val) ||
(flags & LOG2_CHECK && (value & (value - 1)) != 0)) {
clear_problem_context(&pctx);
pctx.num = value;
pctx.str = descr;
fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return 0;
}
return 1;
}
static int check_super_value64(e2fsck_t ctx, const char *descr,
__u64 value, int flags,
__u64 min_val, __u64 max_val)
{
struct problem_context pctx;
if ((flags & MIN_CHECK && value < min_val) ||
(flags & MAX_CHECK && value > max_val) ||
(flags & LOG2_CHECK && (value & (value - 1)) != 0)) {
clear_problem_context(&pctx);
pctx.num = value;
pctx.str = descr;
fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return 0;
}
return 1;
}
/*
* helper function to release an inode
*/
struct process_block_struct {
e2fsck_t ctx;
char *buf;
struct problem_context *pctx;
int truncating;
int truncate_offset;
e2_blkcnt_t truncate_block;
int truncated_blocks;
int abort;
errcode_t errcode;
blk64_t last_cluster;
struct ext2_inode_large *inode;
};
static int release_inode_block(ext2_filsys fs,
blk64_t *block_nr,
e2_blkcnt_t blockcnt,
blk64_t ref_blk EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data)
{
struct process_block_struct *pb;
e2fsck_t ctx;
struct problem_context *pctx;
blk64_t blk = *block_nr;
blk64_t cluster = EXT2FS_B2C(fs, *block_nr);
int retval = 0;
pb = (struct process_block_struct *) priv_data;
ctx = pb->ctx;
pctx = pb->pctx;
pctx->blk = blk;
pctx->blkcount = blockcnt;
if (blk == 0)
return 0;
if (pb->last_cluster == cluster)
return 0;
pb->last_cluster = cluster;
if ((blk < fs->super->s_first_data_block) ||
(blk >= ext2fs_blocks_count(fs->super))) {
fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_BLOCK_NUM, pctx);
return_abort:
pb->abort = 1;
return BLOCK_ABORT;
}
if (!ext2fs_test_block_bitmap2(fs->block_map, blk)) {
fix_problem(ctx, PR_0_ORPHAN_ALREADY_CLEARED_BLOCK, pctx);
goto return_abort;
}
/*
* If we are deleting an orphan, then we leave the fields alone.
* If we are truncating an orphan, then update the inode fields
* and clean up any partial block data.
*/
if (pb->truncating) {
/*
* We only remove indirect blocks if they are
* completely empty.
*/
if (blockcnt < 0) {
int i, limit;
blk_t *bp;
pb->errcode = io_channel_read_blk64(fs->io, blk, 1,
pb->buf);
if (pb->errcode)
goto return_abort;
limit = fs->blocksize >> 2;
for (i = 0, bp = (blk_t *) pb->buf;
i < limit; i++, bp++)
if (*bp)
return 0;
}
/*
* We don't remove direct blocks until we've reached
* the truncation block.
*/
if (blockcnt >= 0 && blockcnt < pb->truncate_block)
return 0;
/*
* If part of the last block needs truncating, we do
* it here.
*/
if ((blockcnt == pb->truncate_block) && pb->truncate_offset) {
pb->errcode = io_channel_read_blk64(fs->io, blk, 1,
pb->buf);
if (pb->errcode)
goto return_abort;
memset(pb->buf + pb->truncate_offset, 0,
fs->blocksize - pb->truncate_offset);
pb->errcode = io_channel_write_blk64(fs->io, blk, 1,
pb->buf);
if (pb->errcode)
goto return_abort;
}
pb->truncated_blocks++;
*block_nr = 0;
retval |= BLOCK_CHANGED;
}
if (ctx->qctx)
quota_data_sub(ctx->qctx, pb->inode, 0, ctx->fs->blocksize);
ext2fs_block_alloc_stats2(fs, blk, -1);
ctx->free_blocks++;
return retval;
}
/*
* This function releases an inode. Returns 1 if an inconsistency was
* found. If the inode has a link count, then it is being truncated and
* not deleted.
*/
static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino,
struct ext2_inode_large *inode, char *block_buf,
struct problem_context *pctx)
{
struct process_block_struct pb;
ext2_filsys fs = ctx->fs;
blk64_t blk;
errcode_t retval;
__u32 count;
if (!ext2fs_inode_has_valid_blocks2(fs, EXT2_INODE(inode)))
return 0;
pb.buf = block_buf + 3 * ctx->fs->blocksize;
pb.ctx = ctx;
pb.abort = 0;
pb.errcode = 0;
pb.pctx = pctx;
pb.last_cluster = 0;
pb.inode = inode;
if (inode->i_links_count) {
pb.truncating = 1;
pb.truncate_block = (e2_blkcnt_t)
((EXT2_I_SIZE(inode) + fs->blocksize - 1) /
fs->blocksize);
pb.truncate_offset = inode->i_size % fs->blocksize;
} else {
pb.truncating = 0;
pb.truncate_block = 0;
pb.truncate_offset = 0;
}
pb.truncated_blocks = 0;
retval = ext2fs_block_iterate3(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE,
block_buf, release_inode_block, &pb);
if (retval) {
com_err("release_inode_blocks", retval,
_("while calling ext2fs_block_iterate for inode %u"),
ino);
return 1;
}
if (pb.abort)
return 1;
/* Refresh the inode since ext2fs_block_iterate may have changed it */
e2fsck_read_inode_full(ctx, ino, EXT2_INODE(inode), sizeof(*inode),
"release_inode_blocks");
if (pb.truncated_blocks)
ext2fs_iblk_sub_blocks(fs, EXT2_INODE(inode),
pb.truncated_blocks);
blk = ext2fs_file_acl_block(fs, EXT2_INODE(inode));
if (blk) {
retval = ext2fs_adjust_ea_refcount3(fs, blk, block_buf, -1,
&count, ino);
if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) {
retval = 0;
count = 1;
}
if (retval) {
com_err("release_inode_blocks", retval,
_("while calling ext2fs_adjust_ea_refcount2 for inode %u"),
ino);
return 1;
}
if (count == 0) {
if (ctx->qctx)
quota_data_sub(ctx->qctx, inode, 0,
ctx->fs->blocksize);
ext2fs_block_alloc_stats2(fs, blk, -1);
ctx->free_blocks++;
}
ext2fs_file_acl_block_set(fs, EXT2_INODE(inode), 0);
}
return 0;
}
/* Load all quota data in preparation for orphan clearing. */
static errcode_t e2fsck_read_all_quotas(e2fsck_t ctx)
{
ext2_ino_t qf_ino;
enum quota_type qtype;
errcode_t retval = 0;
if (!ext2fs_has_feature_quota(ctx->fs->super))
return retval;
retval = quota_init_context(&ctx->qctx, ctx->fs, 0);
if (retval)
return retval;
for (qtype = 0 ; qtype < MAXQUOTAS; qtype++) {
qf_ino = *quota_sb_inump(ctx->fs->super, qtype);
if (qf_ino == 0)
continue;
retval = quota_update_limits(ctx->qctx, qf_ino, qtype);
if (retval)
break;
}
if (retval)
quota_release_context(&ctx->qctx);
return retval;
}
/* Write all the quota info to disk. */
static errcode_t e2fsck_write_all_quotas(e2fsck_t ctx)
{
struct problem_context pctx;
enum quota_type qtype;
if (!ext2fs_has_feature_quota(ctx->fs->super))
return 0;
clear_problem_context(&pctx);
for (qtype = 0 ; qtype < MAXQUOTAS; qtype++) {
pctx.num = qtype;
pctx.errcode = quota_write_inode(ctx->qctx, 1 << qtype);
if (pctx.errcode) {
fix_problem(ctx, PR_6_WRITE_QUOTAS, &pctx);
break;
}
}
quota_release_context(&ctx->qctx);
return pctx.errcode;
}
/*
* This function releases all of the orphan inodes. It returns 1 if
* it hit some error, and 0 on success.
*/
static int release_orphan_inodes(e2fsck_t ctx)
{
ext2_filsys fs = ctx->fs;
ext2_ino_t ino, next_ino;
struct ext2_inode_large inode;
struct problem_context pctx;
char *block_buf;
if ((ino = fs->super->s_last_orphan) == 0)
return 0;
clear_problem_context(&pctx);
pctx.errcode = e2fsck_read_all_quotas(ctx);
if (pctx.errcode) {
fix_problem(ctx, PR_0_QUOTA_INIT_CTX, &pctx);
return 1;
}
/*
* Win or lose, we won't be using the head of the orphan inode
* list again.
*/
fs->super->s_last_orphan = 0;
ext2fs_mark_super_dirty(fs);
/*
* If the filesystem contains errors, don't run the orphan
* list, since the orphan list can't be trusted; and we're
* going to be running a full e2fsck run anyway...
*/
if (fs->super->s_state & EXT2_ERROR_FS) {
if (ctx->qctx)
quota_release_context(&ctx->qctx);
return 0;
}
if ((ino < EXT2_FIRST_INODE(fs->super)) ||
(ino > fs->super->s_inodes_count)) {
clear_problem_context(&pctx);
pctx.ino = ino;
fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx);
goto err_qctx;
}
block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4,
"block iterate buffer");
e2fsck_read_bitmaps(ctx);
while (ino) {
e2fsck_read_inode_full(ctx, ino, EXT2_INODE(&inode),
sizeof(inode), "release_orphan_inodes");
clear_problem_context(&pctx);
pctx.ino = ino;
pctx.inode = EXT2_INODE(&inode);
pctx.str = inode.i_links_count ? _("Truncating") :
_("Clearing");
fix_problem(ctx, PR_0_ORPHAN_CLEAR_INODE, &pctx);
next_ino = inode.i_dtime;
if (next_ino &&
((next_ino < EXT2_FIRST_INODE(fs->super)) ||
(next_ino > fs->super->s_inodes_count))) {
pctx.ino = next_ino;
fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx);
goto err_buf;
}
if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx))
goto err_buf;
if (!inode.i_links_count) {
if (ctx->qctx)
quota_data_inodes(ctx->qctx, &inode, ino, -1);
ext2fs_inode_alloc_stats2(fs, ino, -1,
LINUX_S_ISDIR(inode.i_mode));
ctx->free_inodes++;
inode.i_dtime = ctx->now;
} else {
inode.i_dtime = 0;
}
e2fsck_write_inode_full(ctx, ino, EXT2_INODE(&inode),
sizeof(inode), "delete_file");
ino = next_ino;
}
ext2fs_free_mem(&block_buf);
pctx.errcode = e2fsck_write_all_quotas(ctx);
if (pctx.errcode)
goto err;
return 0;
err_buf:
ext2fs_free_mem(&block_buf);
err_qctx:
if (ctx->qctx)
quota_release_context(&ctx->qctx);
err:
return 1;
}
/*
* Check the resize inode to make sure it is sane. We check both for
* the case where on-line resizing is not enabled (in which case the
* resize inode should be cleared) as well as the case where on-line
* resizing is enabled.
*/
void check_resize_inode(e2fsck_t ctx)
{
ext2_filsys fs = ctx->fs;
struct ext2_inode inode;
struct problem_context pctx;
int i, gdt_off, ind_off;
dgrp_t j;
blk_t blk, pblk;
blk_t expect; /* for resize inode, which is 32-bit only */
__u32 *dind_buf = 0, *ind_buf;
errcode_t retval;
clear_problem_context(&pctx);
/*
* If the resize inode feature isn't set, then
* s_reserved_gdt_blocks must be zero.
*/
if (!ext2fs_has_feature_resize_inode(fs->super)) {
if (fs->super->s_reserved_gdt_blocks) {
pctx.num = fs->super->s_reserved_gdt_blocks;
if (fix_problem(ctx, PR_0_NONZERO_RESERVED_GDT_BLOCKS,
&pctx)) {
fs->super->s_reserved_gdt_blocks = 0;
ext2fs_mark_super_dirty(fs);
}
}
}
/* Read the resize inode */
pctx.ino = EXT2_RESIZE_INO;
retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
if (retval) {
if (ext2fs_has_feature_resize_inode(fs->super))
ctx->flags |= E2F_FLAG_RESIZE_INODE;
return;
}
/*
* If the resize inode feature isn't set, check to make sure
* the resize inode is cleared; then we're done.
*/
if (!ext2fs_has_feature_resize_inode(fs->super)) {
for (i=0; i < EXT2_N_BLOCKS; i++) {
if (inode.i_block[i])
break;
}
if ((i < EXT2_N_BLOCKS) &&
fix_problem(ctx, PR_0_CLEAR_RESIZE_INODE, &pctx)) {
memset(&inode, 0, sizeof(inode));
e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
"clear_resize");
}
return;
}
/*
* The resize inode feature is enabled; check to make sure the
* only block in use is the double indirect block
*/
blk = inode.i_block[EXT2_DIND_BLOCK];
for (i=0; i < EXT2_N_BLOCKS; i++) {
if (i != EXT2_DIND_BLOCK && inode.i_block[i])
break;
}
if ((i < EXT2_N_BLOCKS) || !blk || !inode.i_links_count ||
!(inode.i_mode & LINUX_S_IFREG) ||
(blk < fs->super->s_first_data_block ||
blk >= ext2fs_blocks_count(fs->super))) {
resize_inode_invalid:
if (fix_problem(ctx, PR_0_RESIZE_INODE_INVALID, &pctx)) {
memset(&inode, 0, sizeof(inode));
e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
"clear_resize");
ctx->flags |= E2F_FLAG_RESIZE_INODE;
}
if (!(ctx->options & E2F_OPT_READONLY)) {
fs->super->s_state &= ~EXT2_VALID_FS;
ext2fs_mark_super_dirty(fs);
}
goto cleanup;
}
dind_buf = (__u32 *) e2fsck_allocate_memory(ctx, fs->blocksize * 2,
"resize dind buffer");
ind_buf = (__u32 *) ((char *) dind_buf + fs->blocksize);
retval = ext2fs_read_ind_block(fs, blk, dind_buf);
if (retval)
goto resize_inode_invalid;
gdt_off = fs->desc_blocks;
pblk = fs->super->s_first_data_block + 1 + fs->desc_blocks;
if (fs->blocksize == 1024 && fs->super->s_first_data_block == 0)
pblk++; /* Deal with 1024 blocksize bigalloc fs */
for (i = 0; i < fs->super->s_reserved_gdt_blocks / 4;
i++, gdt_off++, pblk++) {
gdt_off %= fs->blocksize/4;
if (dind_buf[gdt_off] != pblk)
goto resize_inode_invalid;
retval = ext2fs_read_ind_block(fs, pblk, ind_buf);
if (retval)
goto resize_inode_invalid;
ind_off = 0;
for (j = 1; j < fs->group_desc_count; j++) {
if (!ext2fs_bg_has_super(fs, j))
continue;
expect = pblk + EXT2_GROUPS_TO_BLOCKS(fs->super, j);
if (ind_buf[ind_off] != expect)
goto resize_inode_invalid;
ind_off++;
}
}
cleanup:
if (dind_buf)
ext2fs_free_mem(&dind_buf);
}
/*
* This function checks the dirhash signed/unsigned hint if necessary.
*/
static void e2fsck_fix_dirhash_hint(e2fsck_t ctx)
{
struct ext2_super_block *sb = ctx->fs->super;
struct problem_context pctx;
char c;
if ((ctx->options & E2F_OPT_READONLY) ||
!ext2fs_has_feature_dir_index(sb) ||
(sb->s_flags & (EXT2_FLAGS_SIGNED_HASH|EXT2_FLAGS_UNSIGNED_HASH)))
return;
c = (char) 255;
clear_problem_context(&pctx);
if (fix_problem(ctx, PR_0_DIRHASH_HINT, &pctx)) {
if (((int) c) == -1) {
sb->s_flags |= EXT2_FLAGS_SIGNED_HASH;
} else {
sb->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
}
ext2fs_mark_super_dirty(ctx->fs);
}
}
void check_super_block(e2fsck_t ctx)
{
ext2_filsys fs = ctx->fs;
blk64_t first_block, last_block;
struct ext2_super_block *sb = fs->super;
unsigned int ipg_max;
problem_t problem;
blk64_t blocks_per_group = fs->super->s_blocks_per_group;
__u32 bpg_max, cpg_max;
__u64 blks_max;
int inodes_per_block;
int inode_size;
int accept_time_fudge;
int broken_system_clock;
dgrp_t i;
blk64_t should_be;
struct problem_context pctx;
blk64_t free_blocks = 0;
ino_t free_inodes = 0;
int csum_flag, clear_test_fs_flag;
inodes_per_block = EXT2_INODES_PER_BLOCK(fs->super);
ipg_max = inodes_per_block * (blocks_per_group - 4);
if (ipg_max > EXT2_MAX_INODES_PER_GROUP(sb))
ipg_max = EXT2_MAX_INODES_PER_GROUP(sb);
cpg_max = 8 * EXT2_BLOCK_SIZE(sb);
if (cpg_max > EXT2_MAX_CLUSTERS_PER_GROUP(sb))
cpg_max = EXT2_MAX_CLUSTERS_PER_GROUP(sb);
bpg_max = 8 * EXT2_BLOCK_SIZE(sb) * EXT2FS_CLUSTER_RATIO(fs);
if (bpg_max > EXT2_MAX_BLOCKS_PER_GROUP(sb))
bpg_max = EXT2_MAX_BLOCKS_PER_GROUP(sb);
ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap");
ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
sizeof(int) * fs->group_desc_count, "invalid_block_bitmap");
ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx,
sizeof(int) * fs->group_desc_count, "invalid_inode_table");
blks_max = (1ULL << 32) * EXT2_MAX_BLOCKS_PER_GROUP(fs->super);
if (ext2fs_has_feature_64bit(fs->super)) {
if (blks_max > ((1ULL << 48) - 1))
blks_max = (1ULL << 48) - 1;
} else {
if (blks_max > ((1ULL << 32) - 1))
blks_max = (1ULL << 32) - 1;
}
clear_problem_context(&pctx);
/*
* Verify the super block constants...
*/
if (!check_super_value(ctx, "inodes_count", sb->s_inodes_count,
MIN_CHECK, 1, 0))
return;
if (!check_super_value64(ctx, "blocks_count", ext2fs_blocks_count(sb),
MIN_CHECK | MAX_CHECK, 1, blks_max))
return;
if (!check_super_value(ctx, "first_data_block", sb->s_first_data_block,
MAX_CHECK, 0, ext2fs_blocks_count(sb)))
return;
if (!check_super_value(ctx, "log_block_size", sb->s_log_block_size,
MIN_CHECK | MAX_CHECK, 0,
EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE))
return;
if (!check_super_value(ctx, "log_cluster_size",
sb->s_log_cluster_size,
MIN_CHECK | MAX_CHECK, sb->s_log_block_size,
(EXT2_MAX_CLUSTER_LOG_SIZE -
EXT2_MIN_CLUSTER_LOG_SIZE)))
return;
if (!check_super_value(ctx, "clusters_per_group",
sb->s_clusters_per_group,
MIN_CHECK | MAX_CHECK, 8, cpg_max))
return;
if (!check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group,
MIN_CHECK | MAX_CHECK, 8, bpg_max))
return;
if (!check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group,
MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max))
return;
if (!check_super_value(ctx, "r_blocks_count", ext2fs_r_blocks_count(sb),
MAX_CHECK, 0, ext2fs_blocks_count(sb) / 2))
return;
if (!check_super_value(ctx, "reserved_gdt_blocks",
sb->s_reserved_gdt_blocks, MAX_CHECK, 0,
fs->blocksize / sizeof(__u32)))
return;
if (!check_super_value(ctx, "desc_size",
sb->s_desc_size, MAX_CHECK | LOG2_CHECK, 0,
EXT2_MAX_DESC_SIZE))
return;
should_be = (__u64)sb->s_inodes_per_group * fs->group_desc_count;
if (should_be > ~0U) {
pctx.num = should_be;
fix_problem(ctx, PR_0_INODE_COUNT_BIG, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
if (sb->s_inodes_count != should_be) {
pctx.ino = sb->s_inodes_count;
pctx.ino2 = should_be;
if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) {
sb->s_inodes_count = should_be;
ext2fs_mark_super_dirty(fs);
}
}
if (sb->s_rev_level > EXT2_GOOD_OLD_REV &&
!check_super_value(ctx, "first_ino", sb->s_first_ino,
MIN_CHECK | MAX_CHECK,
EXT2_GOOD_OLD_FIRST_INO, sb->s_inodes_count))
return;
inode_size = EXT2_INODE_SIZE(sb);
if (!check_super_value(ctx, "inode_size",
inode_size, MIN_CHECK | MAX_CHECK | LOG2_CHECK,
EXT2_GOOD_OLD_INODE_SIZE, fs->blocksize))
return;
if (sb->s_blocks_per_group != (sb->s_clusters_per_group *
EXT2FS_CLUSTER_RATIO(fs))) {
pctx.num = sb->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs);
pctx.str = "block_size";
fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
if ((ctx->flags & E2F_FLAG_GOT_DEVSIZE) &&
(ctx->num_blocks < ext2fs_blocks_count(sb))) {
pctx.blk = ext2fs_blocks_count(sb);
pctx.blk2 = ctx->num_blocks;
if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) {
ctx->flags |= E2F_FLAG_ABORT;
return;
}
}
should_be = (sb->s_log_block_size == 0 &&
EXT2FS_CLUSTER_RATIO(fs) == 1) ? 1 : 0;
if (sb->s_first_data_block != should_be) {
pctx.blk = sb->s_first_data_block;
pctx.blk2 = should_be;
fix_problem(ctx, PR_0_FIRST_DATA_BLOCK, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
if (EXT2_INODE_SIZE(sb) > EXT2_GOOD_OLD_INODE_SIZE) {
unsigned min =
sizeof(((struct ext2_inode_large *) 0)->i_extra_isize) +
sizeof(((struct ext2_inode_large *) 0)->i_checksum_hi);
unsigned max = EXT2_INODE_SIZE(sb) - EXT2_GOOD_OLD_INODE_SIZE;
pctx.num = sb->s_min_extra_isize;
if (sb->s_min_extra_isize &&
(sb->s_min_extra_isize < min ||
sb->s_min_extra_isize > max ||
sb->s_min_extra_isize & 3) &&
fix_problem(ctx, PR_0_BAD_MIN_EXTRA_ISIZE, &pctx)) {
sb->s_min_extra_isize =
(sizeof(struct ext2_inode_large) -
EXT2_GOOD_OLD_INODE_SIZE);
ext2fs_mark_super_dirty(fs);
}
pctx.num = sb->s_want_extra_isize;
if (sb->s_want_extra_isize &&
(sb->s_want_extra_isize < min ||
sb->s_want_extra_isize > max ||
sb->s_want_extra_isize & 3) &&
fix_problem(ctx, PR_0_BAD_WANT_EXTRA_ISIZE, &pctx)) {
sb->s_want_extra_isize =
(sizeof(struct ext2_inode_large) -
EXT2_GOOD_OLD_INODE_SIZE);
ext2fs_mark_super_dirty(fs);
}
}
/* Are metadata_csum and uninit_bg both set? */
if (ext2fs_has_feature_metadata_csum(fs->super) &&
ext2fs_has_feature_gdt_csum(fs->super) &&
fix_problem(ctx, PR_0_META_AND_GDT_CSUM_SET, &pctx)) {
ext2fs_clear_feature_gdt_csum(fs->super);
ext2fs_mark_super_dirty(fs);
for (i = 0; i < fs->group_desc_count; i++)
ext2fs_group_desc_csum_set(fs, i);
}
/* We can't have ^metadata_csum,metadata_csum_seed */
if (!ext2fs_has_feature_metadata_csum(fs->super) &&
ext2fs_has_feature_csum_seed(fs->super) &&
fix_problem(ctx, PR_0_CSUM_SEED_WITHOUT_META_CSUM, &pctx)) {
ext2fs_clear_feature_csum_seed(fs->super);
fs->super->s_checksum_seed = 0;
ext2fs_mark_super_dirty(fs);
}
/* Is 64bit set and extents unset? */
if (ext2fs_has_feature_64bit(fs->super) &&
!ext2fs_has_feature_extents(fs->super) &&
fix_problem(ctx, PR_0_64BIT_WITHOUT_EXTENTS, &pctx)) {
ext2fs_set_feature_extents(fs->super);
ext2fs_mark_super_dirty(fs);
}
/* Did user ask us to convert files to extents? */
if (ctx->options & E2F_OPT_CONVERT_BMAP) {
ext2fs_set_feature_extents(fs->super);
ext2fs_mark_super_dirty(fs);
}
if (ext2fs_has_feature_meta_bg(fs->super) &&
(fs->super->s_first_meta_bg > fs->desc_blocks)) {
pctx.group = fs->desc_blocks;
pctx.num = fs->super->s_first_meta_bg;
if (fix_problem(ctx, PR_0_FIRST_META_BG_TOO_BIG, &pctx)) {
ext2fs_clear_feature_meta_bg(fs->super);
fs->super->s_first_meta_bg = 0;
ext2fs_mark_super_dirty(fs);
}
}
/*
* Verify the group descriptors....
*/
first_block = sb->s_first_data_block;
last_block = ext2fs_blocks_count(sb)-1;
csum_flag = ext2fs_has_group_desc_csum(fs);
for (i = 0; i < fs->group_desc_count; i++) {
pctx.group = i;
if (!ext2fs_has_feature_flex_bg(fs->super)) {
first_block = ext2fs_group_first_block2(fs, i);
last_block = ext2fs_group_last_block2(fs, i);
}
if ((ext2fs_block_bitmap_loc(fs, i) < first_block) ||
(ext2fs_block_bitmap_loc(fs, i) > last_block)) {
pctx.blk = ext2fs_block_bitmap_loc(fs, i);
if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx))
ext2fs_block_bitmap_loc_set(fs, i, 0);
}
if (ext2fs_block_bitmap_loc(fs, i) == 0) {
ctx->invalid_block_bitmap_flag[i]++;
ctx->invalid_bitmaps++;
}
if ((ext2fs_inode_bitmap_loc(fs, i) < first_block) ||
(ext2fs_inode_bitmap_loc(fs, i) > last_block)) {
pctx.blk = ext2fs_inode_bitmap_loc(fs, i);
if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx))
ext2fs_inode_bitmap_loc_set(fs, i, 0);
}
if (ext2fs_inode_bitmap_loc(fs, i) == 0) {
ctx->invalid_inode_bitmap_flag[i]++;
ctx->invalid_bitmaps++;
}
if ((ext2fs_inode_table_loc(fs, i) < first_block) ||
((ext2fs_inode_table_loc(fs, i) +
fs->inode_blocks_per_group - 1) > last_block)) {
pctx.blk = ext2fs_inode_table_loc(fs, i);
if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx))
ext2fs_inode_table_loc_set(fs, i, 0);
}
if (ext2fs_inode_table_loc(fs, i) == 0) {
ctx->invalid_inode_table_flag[i]++;
ctx->invalid_bitmaps++;
}
free_blocks += ext2fs_bg_free_blocks_count(fs, i);
free_inodes += ext2fs_bg_free_inodes_count(fs, i);
if ((ext2fs_bg_free_blocks_count(fs, i) > sb->s_blocks_per_group) ||
(ext2fs_bg_free_inodes_count(fs, i) > sb->s_inodes_per_group) ||
(ext2fs_bg_used_dirs_count(fs, i) > sb->s_inodes_per_group))
ext2fs_unmark_valid(fs);
should_be = 0;
if (!ext2fs_group_desc_csum_verify(fs, i)) {
pctx.csum1 = ext2fs_bg_checksum(fs, i);
pctx.csum2 = ext2fs_group_desc_csum(fs, i);
if (fix_problem(ctx, PR_0_GDT_CSUM, &pctx)) {
ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT);
ext2fs_bg_itable_unused_set(fs, i, 0);
should_be = 1;
}
ext2fs_unmark_valid(fs);
}
if (!csum_flag &&
(ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) ||
ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT) ||
ext2fs_bg_itable_unused(fs, i) != 0)) {
if (fix_problem(ctx, PR_0_GDT_UNINIT, &pctx)) {
ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT);
ext2fs_bg_itable_unused_set(fs, i, 0);
should_be = 1;
}
ext2fs_unmark_valid(fs);
}
if (i == fs->group_desc_count - 1 &&
ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT)) {
if (fix_problem(ctx, PR_0_BB_UNINIT_LAST, &pctx)) {
ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
should_be = 1;
}
ext2fs_unmark_valid(fs);
}
if (csum_flag &&
(ext2fs_bg_itable_unused(fs, i) > ext2fs_bg_free_inodes_count(fs, i) ||
ext2fs_bg_itable_unused(fs, i) > sb->s_inodes_per_group)) {
pctx.blk = ext2fs_bg_itable_unused(fs, i);
if (fix_problem(ctx, PR_0_GDT_ITABLE_UNUSED, &pctx)) {
ext2fs_bg_itable_unused_set(fs, i, 0);
should_be = 1;
}
ext2fs_unmark_valid(fs);
}
if (should_be)
ext2fs_group_desc_csum_set(fs, i);
/* If the user aborts e2fsck by typing ^C, stop right away */
if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
return;
}
ctx->free_blocks = EXT2FS_C2B(fs, free_blocks);
ctx->free_inodes = free_inodes;
if ((ext2fs_free_blocks_count(sb) > ext2fs_blocks_count(sb)) ||
(sb->s_free_inodes_count > sb->s_inodes_count))
ext2fs_unmark_valid(fs);
/*
* If we have invalid bitmaps, set the error state of the
* filesystem.
*/
if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) {
sb->s_state &= ~EXT2_VALID_FS;
ext2fs_mark_super_dirty(fs);
}
clear_problem_context(&pctx);
#ifndef EXT2_SKIP_UUID
/*
* If the UUID field isn't assigned, assign it.
* Skip if checksums are enabled and the filesystem is mounted,
* if the id changes under the kernel remounting rw may fail.
*/
if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid) &&
!ext2fs_has_feature_metadata_csum(ctx->fs->super) &&
(!csum_flag || !(ctx->mount_flags & EXT2_MF_MOUNTED))) {
if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) {
uuid_generate(sb->s_uuid);
ext2fs_init_csum_seed(fs);
fs->flags |= EXT2_FLAG_DIRTY;
fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
}
}
#endif
/*
* Check to see if we should disable the test_fs flag
*/
profile_get_boolean(ctx->profile, "options",
"clear_test_fs_flag", 0, 1,
&clear_test_fs_flag);
if (!(ctx->options & E2F_OPT_READONLY) &&
clear_test_fs_flag &&
(fs->super->s_flags & EXT2_FLAGS_TEST_FILESYS) &&
(fs_proc_check("ext4") || check_for_modules("ext4"))) {
if (fix_problem(ctx, PR_0_CLEAR_TESTFS_FLAG, &pctx)) {
fs->super->s_flags &= ~EXT2_FLAGS_TEST_FILESYS;
fs->flags |= EXT2_FLAG_DIRTY;
fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
}
}
/*
* For the Hurd, check to see if the filetype option is set,
* since it doesn't support it.
*/
if (!(ctx->options & E2F_OPT_READONLY) &&
fs->super->s_creator_os == EXT2_OS_HURD &&
ext2fs_has_feature_filetype(fs->super)) {
if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) {
ext2fs_clear_feature_filetype(fs->super);
ext2fs_mark_super_dirty(fs);
fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
}
}
/*
* If we have any of the compatibility flags set, we need to have a
* revision 1 filesystem. Most kernels will not check the flags on
* a rev 0 filesystem and we may have corruption issues because of
* the incompatible changes to the filesystem.
*/
if (!(ctx->options & E2F_OPT_READONLY) &&
fs->super->s_rev_level == EXT2_GOOD_OLD_REV &&
(fs->super->s_feature_compat ||
fs->super->s_feature_ro_compat ||
fs->super->s_feature_incompat) &&
fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) {
ext2fs_update_dynamic_rev(fs);
ext2fs_mark_super_dirty(fs);
fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
}
/*
* Clean up any orphan inodes, if present.
*/
if (!(ctx->options & E2F_OPT_READONLY) && release_orphan_inodes(ctx)) {
fs->super->s_state &= ~EXT2_VALID_FS;
ext2fs_mark_super_dirty(fs);
}
/*
* Unfortunately, due to Windows' unfortunate design decision
* to configure the hardware clock to tick localtime, instead
* of the more proper and less error-prone UTC time, many
* users end up in the situation where the system clock is
* incorrectly set at the time when e2fsck is run.
*
* Historically this was usually due to some distributions
* having buggy init scripts and/or installers that didn't
* correctly detect this case and take appropriate
* countermeasures. However, it's still possible, despite the
* best efforts of init script and installer authors to not be
* able to detect this misconfiguration, usually due to a
* buggy or misconfigured virtualization manager or the
* installer not having access to a network time server during
* the installation process. So by default, we allow the
* superblock times to be fudged by up to 24 hours. This can
* be disabled by setting options.accept_time_fudge to the
* boolean value of false in e2fsck.conf. We also support
* options.buggy_init_scripts for backwards compatibility.
*/
profile_get_boolean(ctx->profile, "options", "accept_time_fudge",
0, 1, &accept_time_fudge);
profile_get_boolean(ctx->profile, "options", "buggy_init_scripts",
0, accept_time_fudge, &accept_time_fudge);
ctx->time_fudge = accept_time_fudge ? 86400 : 0;
profile_get_boolean(ctx->profile, "options", "broken_system_clock",
0, 0, &broken_system_clock);
/*
* Check to see if the superblock last mount time or last
* write time is in the future.
*/
if (!broken_system_clock &&
!(ctx->flags & E2F_FLAG_TIME_INSANE) &&
fs->super->s_mtime > (__u32) ctx->now) {
pctx.num = fs->super->s_mtime;
problem = PR_0_FUTURE_SB_LAST_MOUNT;
if (fs->super->s_mtime <= (__u32) ctx->now + ctx->time_fudge)
problem = PR_0_FUTURE_SB_LAST_MOUNT_FUDGED;
if (fix_problem(ctx, problem, &pctx)) {
fs->super->s_mtime = ctx->now;
fs->flags |= EXT2_FLAG_DIRTY;
}
}
if (!broken_system_clock &&
!(ctx->flags & E2F_FLAG_TIME_INSANE) &&
fs->super->s_wtime > (__u32) ctx->now) {
pctx.num = fs->super->s_wtime;
problem = PR_0_FUTURE_SB_LAST_WRITE;
if (fs->super->s_wtime <= (__u32) ctx->now + ctx->time_fudge)
problem = PR_0_FUTURE_SB_LAST_WRITE_FUDGED;
if (fix_problem(ctx, problem, &pctx)) {
fs->super->s_wtime = ctx->now;
fs->flags |= EXT2_FLAG_DIRTY;
}
}
e2fsck_validate_quota_inodes(ctx);
/*
* Move the ext3 journal file, if necessary.
*/
e2fsck_move_ext3_journal(ctx);
/*
* Fix journal hint, if necessary
*/
e2fsck_fix_ext3_journal_hint(ctx);
/*
* Add dirhash hint if necessary
*/
e2fsck_fix_dirhash_hint(ctx);
/*
* Hide quota inodes if necessary.
*/
e2fsck_hide_quota(ctx);
return;
}
/*
* Check to see if we should backup the master sb to the backup super
* blocks. Returns non-zero if the sb should be backed up.
*/
/*
* A few flags are set on the fly by the kernel, but only in the
* primary superblock. This is actually a bad thing, and we should
* try to discourage it in the future. In particular, for the newer
* ext4 files, especially EXT4_FEATURE_RO_COMPAT_DIR_NLINK and
* EXT3_FEATURE_INCOMPAT_EXTENTS. So some of these may go away in the
* future. EXT3_FEATURE_INCOMPAT_RECOVER may also get set when
* copying the primary superblock during online resize.
*
* The kernel will set EXT2_FEATURE_COMPAT_EXT_ATTR, but
* unfortunately, we shouldn't ignore it since if it's not set in the
* backup, the extended attributes in the filesystem will be stripped
* away.
*/
#define FEATURE_RO_COMPAT_IGNORE (EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
EXT4_FEATURE_RO_COMPAT_DIR_NLINK)
#define FEATURE_INCOMPAT_IGNORE (EXT3_FEATURE_INCOMPAT_EXTENTS| \
EXT3_FEATURE_INCOMPAT_RECOVER)
int check_backup_super_block(e2fsck_t ctx)
{
ext2_filsys fs = ctx->fs;
errcode_t retval;
dgrp_t g;
blk64_t sb;
int ret = 0;
char buf[SUPERBLOCK_SIZE];
struct ext2_super_block *backup_sb;
/*
* If we are already writing out the backup blocks, then we
* don't need to test. Also, if the filesystem is invalid, or
* the check was aborted or cancelled, we also don't want to
* do the backup. If the filesystem was opened read-only then
* we can't do the backup.
*/
if (((fs->flags & EXT2_FLAG_MASTER_SB_ONLY) == 0) ||
!ext2fs_test_valid(fs) ||
(fs->super->s_state & EXT2_ERROR_FS) ||
(ctx->flags & (E2F_FLAG_ABORT | E2F_FLAG_CANCEL)) ||
(ctx->options & E2F_OPT_READONLY))
return 0;
for (g = 1; g < fs->group_desc_count; g++) {
if (!ext2fs_bg_has_super(fs, g))
continue;
sb = ext2fs_group_first_block2(fs, g);
retval = io_channel_read_blk(fs->io, sb, -SUPERBLOCK_SIZE,
buf);
if (retval)
continue;
backup_sb = (struct ext2_super_block *) buf;
#ifdef WORDS_BIGENDIAN
ext2fs_swap_super(backup_sb);
#endif
if ((backup_sb->s_magic != EXT2_SUPER_MAGIC) ||
(backup_sb->s_rev_level > EXT2_LIB_CURRENT_REV) ||
((backup_sb->s_log_block_size + EXT2_MIN_BLOCK_LOG_SIZE) >
EXT2_MAX_BLOCK_LOG_SIZE) ||
(EXT2_INODE_SIZE(backup_sb) < EXT2_GOOD_OLD_INODE_SIZE))
continue;
#define SUPER_INCOMPAT_DIFFERENT(x) \
((fs->super->x & ~FEATURE_INCOMPAT_IGNORE) != \
(backup_sb->x & ~FEATURE_INCOMPAT_IGNORE))
#define SUPER_RO_COMPAT_DIFFERENT(x) \
((fs->super->x & ~FEATURE_RO_COMPAT_IGNORE) != \
(backup_sb->x & ~FEATURE_RO_COMPAT_IGNORE))
#define SUPER_DIFFERENT(x) \
(fs->super->x != backup_sb->x)
if (SUPER_DIFFERENT(s_feature_compat) ||
SUPER_INCOMPAT_DIFFERENT(s_feature_incompat) ||
SUPER_RO_COMPAT_DIFFERENT(s_feature_ro_compat) ||
SUPER_DIFFERENT(s_blocks_count) ||
SUPER_DIFFERENT(s_blocks_count_hi) ||
SUPER_DIFFERENT(s_inodes_count) ||
memcmp(fs->super->s_uuid, backup_sb->s_uuid,
sizeof(fs->super->s_uuid)))
ret = 1;
break;
}
return ret;
}
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