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e2fsprogs
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e2fsprogs/e2fsck/super.c

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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%
*/
#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
static void 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))) {
clear_problem_context(&pctx);
pctx.num = value;
pctx.str = descr;
fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
}
}
/*
* This routine may get stubbed out in special compilations of the
* e2fsck code..
*/
#ifndef EXT2_SPECIAL_DEVICE_SIZE
errcode_t e2fsck_get_device_size(e2fsck_t ctx)
{
return (ext2fs_get_device_size(ctx->filesystem_name,
EXT2_BLOCK_SIZE(ctx->fs->super),
&ctx->num_blocks));
}
#endif
/*
* helper function to release an inode
*/
struct process_block_struct {
e2fsck_t ctx;
char *buf;
struct problem_context *pctx;
int truncating;
int truncate_offset;
blk_t truncate_block;
int truncated_blocks;
int abort;
errcode_t errcode;
};
static int release_inode_block(ext2_filsys fs,
blk_t *block_nr,
int blockcnt,
void *priv_data)
{
struct process_block_struct *pb;
e2fsck_t ctx;
struct problem_context *pctx;
blk_t blk = *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 (HOLE_BLKADDR(blk))
return 0;
if ((blk < fs->super->s_first_data_block) ||
(blk >= fs->super->s_blocks_count)) {
fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_BLOCK_NUM, pctx);
return_abort:
pb->abort = 1;
return BLOCK_ABORT;
}
if (!ext2fs_test_block_bitmap(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_blk(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_blk(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_blk(fs->io, blk, 1,
pb->buf);
if (pb->errcode)
goto return_abort;
}
pb->truncated_blocks++;
*block_nr = 0;
retval |= BLOCK_CHANGED;
}
ext2fs_unmark_block_bitmap(fs->block_map, blk);
fs->group_desc[ext2fs_group_of_blk(fs, blk)].bg_free_blocks_count++;
fs->super->s_free_blocks_count++;
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 *inode, char *block_buf,
struct problem_context *pctx)
{
ext2_filsys fs = ctx->fs;
errcode_t retval;
struct process_block_struct pb;
if (!ext2fs_inode_has_valid_blocks(inode))
return 0;
pb.buf = block_buf + 3 * ctx->fs->blocksize;
pb.ctx = ctx;
pb.abort = 0;
pb.errcode = 0;
pb.pctx = pctx;
if (inode->i_links_count) {
pb.truncating = 1;
pb.truncate_block = (blk_t)
((((long long)inode->i_size_high << 32) +
inode->i_size + 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_iterate(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 %d"),
ino);
return 1;
}
if (pb.abort)
return 1;
/* Refresh the inode since ext2fs_block_iterate may have changed it */
e2fsck_read_inode(ctx, ino, inode, "release_inode_blocks");
if (pb.truncated_blocks)
inode->i_blocks -= pb.truncated_blocks *
(fs->blocksize / 512);
ext2fs_mark_bb_dirty(fs);
return 0;
}
/*
* 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;
int group;
ext2_ino_t ino, next_ino;
struct ext2_inode inode;
struct problem_context pctx;
char *block_buf;
if ((ino = fs->super->s_last_orphan) == 0)
return 0;
/*
* 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)
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);
return 1;
}
block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4,
"block iterate buffer");
e2fsck_read_bitmaps(ctx);
while (ino) {
e2fsck_read_inode(ctx, ino, &inode, "release_orphan_inodes");
clear_problem_context(&pctx);
pctx.ino = ino;
pctx.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 return_abort;
}
if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx))
goto return_abort;
if (!inode.i_links_count) {
ext2fs_unmark_inode_bitmap(fs->inode_map, ino);
ext2fs_mark_ib_dirty(fs);
group = ext2fs_group_of_ino(fs, ino);
fs->group_desc[group].bg_free_inodes_count++;
fs->super->s_free_inodes_count++;
if (LINUX_S_ISDIR(inode.i_mode))
fs->group_desc[group].bg_used_dirs_count--;
inode.i_dtime = time(0);
}
e2fsck_write_inode(ctx, ino, &inode, "delete_file");
ino = next_ino;
}
ext2fs_free_mem((void **) &block_buf);
return 0;
return_abort:
ext2fs_free_mem((void **) &block_buf);
return 1;
}
void check_super_block(e2fsck_t ctx)
{
ext2_filsys fs = ctx->fs;
blk_t first_block, last_block;
struct ext2_super_block *sb = fs->super;
blk_t blocks_per_group = fs->super->s_blocks_per_group;
blk_t bpg_max;
int inodes_per_block;
int ipg_max;
dgrp_t i;
blk_t should_be;
struct problem_context pctx;
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);
bpg_max = 8 * EXT2_BLOCK_SIZE(sb);
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");
clear_problem_context(&pctx);
/*
* Verify the super block constants...
*/
check_super_value(ctx, "inodes_count", sb->s_inodes_count,
MIN_CHECK, 1, 0);
check_super_value(ctx, "blocks_count", sb->s_blocks_count,
MIN_CHECK, 1, 0);
check_super_value(ctx, "first_data_block", sb->s_first_data_block,
MAX_CHECK, 0, sb->s_blocks_count);
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);
check_super_value(ctx, "log_frag_size", sb->s_log_frag_size,
MIN_CHECK | MAX_CHECK, 0, sb->s_log_block_size);
check_super_value(ctx, "frags_per_group", sb->s_frags_per_group,
MIN_CHECK | MAX_CHECK, sb->s_blocks_per_group,
bpg_max);
check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group,
MIN_CHECK | MAX_CHECK, 8, bpg_max);
check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group,
MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max);
check_super_value(ctx, "r_blocks_count", sb->s_r_blocks_count,
MAX_CHECK, 0, sb->s_blocks_count / 4);
if (!ctx->num_blocks) {
pctx.errcode = e2fsck_get_device_size(ctx);
if (pctx.errcode && pctx.errcode != EXT2_ET_UNIMPLEMENTED) {
fix_problem(ctx, PR_0_GETSIZE_ERROR, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
if ((pctx.errcode != EXT2_ET_UNIMPLEMENTED) &&
(ctx->num_blocks < sb->s_blocks_count)) {
pctx.blk = sb->s_blocks_count;
pctx.blk2 = ctx->num_blocks;
if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) {
ctx->flags |= E2F_FLAG_ABORT;
return;
}
}
}
if (sb->s_log_block_size != sb->s_log_frag_size) {
pctx.blk = EXT2_BLOCK_SIZE(sb);
pctx.blk2 = EXT2_FRAG_SIZE(sb);
fix_problem(ctx, PR_0_NO_FRAGMENTS, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
should_be = sb->s_frags_per_group >>
(sb->s_log_block_size - sb->s_log_frag_size);
if (sb->s_blocks_per_group != should_be) {
pctx.blk = sb->s_blocks_per_group;
pctx.blk2 = should_be;
fix_problem(ctx, PR_0_BLOCKS_PER_GROUP, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
should_be = (sb->s_log_block_size == 0) ? 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;
}
should_be = sb->s_inodes_per_group * fs->group_desc_count;
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);
}
}
/*
* Verify the group descriptors....
*/
first_block = fs->super->s_first_data_block;
last_block = first_block + blocks_per_group;
for (i = 0; i < fs->group_desc_count; i++) {
pctx.group = i;
if (i == fs->group_desc_count - 1)
last_block = fs->super->s_blocks_count;
if ((fs->group_desc[i].bg_block_bitmap < first_block) ||
(fs->group_desc[i].bg_block_bitmap >= last_block)) {
pctx.blk = fs->group_desc[i].bg_block_bitmap;
if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx))
fs->group_desc[i].bg_block_bitmap = 0;
}
if (fs->group_desc[i].bg_block_bitmap == 0) {
ctx->invalid_block_bitmap_flag[i]++;
ctx->invalid_bitmaps++;
}
if ((fs->group_desc[i].bg_inode_bitmap < first_block) ||
(fs->group_desc[i].bg_inode_bitmap >= last_block)) {
pctx.blk = fs->group_desc[i].bg_inode_bitmap;
if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx))
fs->group_desc[i].bg_inode_bitmap = 0;
}
if (fs->group_desc[i].bg_inode_bitmap == 0) {
ctx->invalid_inode_bitmap_flag[i]++;
ctx->invalid_bitmaps++;
}
if ((fs->group_desc[i].bg_inode_table < first_block) ||
((fs->group_desc[i].bg_inode_table +
fs->inode_blocks_per_group - 1) >= last_block)) {
pctx.blk = fs->group_desc[i].bg_inode_table;
if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx))
fs->group_desc[i].bg_inode_table = 0;
}
if (fs->group_desc[i].bg_inode_table == 0) {
ctx->invalid_inode_table_flag[i]++;
ctx->invalid_bitmaps++;
}
first_block += fs->super->s_blocks_per_group;
last_block += fs->super->s_blocks_per_group;
}
/*
* If we have invalid bitmaps, set the error state of the
* filesystem.
*/
if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) {
fs->super->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.
*/
if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid)) {
if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) {
uuid_generate(sb->s_uuid);
ext2fs_mark_super_dirty(fs);
}
}
#endif
/*
* 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 &&
(fs->super->s_feature_incompat &
EXT2_FEATURE_INCOMPAT_FILETYPE)) {
if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) {
fs->super->s_feature_incompat &=
~EXT2_FEATURE_INCOMPAT_FILETYPE;
ext2fs_mark_super_dirty(fs);
}
}
/*
* 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);
}
/*
* 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);
}
/*
* Move the ext3 journal file, if necessary.
*/
e2fsck_move_ext3_journal(ctx);
return;
}
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