blob: 9a491b136b7f605d981de1c0728cbf0df1082afd [file] [log] [blame]
/*
* pass4.c -- pass #4 of e2fsck: Check reference counts
*
* 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%
*
* Pass 4 frees the following data structures:
* - A bitmap of which inodes are in bad blocks. (inode_bb_map)
* - A bitmap of which inodes are imagic inodes. (inode_imagic_map)
* - Ref counts for ea_inodes. (ea_inode_refs)
*/
#include "config.h"
#include "e2fsck.h"
#include "problem.h"
#include <ext2fs/ext2_ext_attr.h>
/*
* This routine is called when an inode is not connected to the
* directory tree.
*
* This subroutine returns 1 then the caller shouldn't bother with the
* rest of the pass 4 tests.
*/
static int disconnect_inode(e2fsck_t ctx, ext2_ino_t i,
struct ext2_inode_large *inode)
{
ext2_filsys fs = ctx->fs;
struct problem_context pctx;
__u32 eamagic = 0;
int extra_size = 0;
e2fsck_read_inode_full(ctx, i, EXT2_INODE(inode),
EXT2_INODE_SIZE(fs->super),
"pass4: disconnect_inode");
if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE)
extra_size = inode->i_extra_isize;
clear_problem_context(&pctx);
pctx.ino = i;
pctx.inode = EXT2_INODE(inode);
if (EXT2_INODE_SIZE(fs->super) -EXT2_GOOD_OLD_INODE_SIZE -extra_size >0)
eamagic = *(__u32 *)(((char *)inode) +EXT2_GOOD_OLD_INODE_SIZE +
extra_size);
/*
* Offer to delete any zero-length files that does not have
* blocks. If there is an EA block, it might have useful
* information, so we won't prompt to delete it, but let it be
* reconnected to lost+found.
*/
if (!inode->i_blocks && eamagic != EXT2_EXT_ATTR_MAGIC &&
(LINUX_S_ISREG(inode->i_mode) || LINUX_S_ISDIR(inode->i_mode))) {
if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) {
e2fsck_clear_inode(ctx, i, EXT2_INODE(inode), 0,
"disconnect_inode");
/*
* Fix up the bitmaps...
*/
e2fsck_read_bitmaps(ctx);
ext2fs_inode_alloc_stats2(fs, i, -1,
LINUX_S_ISDIR(inode->i_mode));
quota_data_inodes(ctx->qctx, inode, i, -1);
return 0;
}
}
/*
* Prompt to reconnect.
*/
if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) {
if (e2fsck_reconnect_file(ctx, i))
ext2fs_unmark_valid(fs);
} else {
/*
* If we don't attach the inode, then skip the
* i_links_test since there's no point in trying to
* force i_links_count to zero.
*/
ext2fs_unmark_valid(fs);
return 1;
}
return 0;
}
static void check_ea_inode(e2fsck_t ctx, ext2_ino_t i,
struct ext2_inode_large *inode, __u16 *link_counted)
{
__u64 actual_refs = 0;
__u64 ref_count;
/*
* This function is called when link_counted is zero. So this may not
* be an xattr inode at all. Return immediately if EA_INODE flag is not
* set.
*/
e2fsck_read_inode_full(ctx, i, EXT2_INODE(inode),
EXT2_INODE_SIZE(ctx->fs->super),
"pass4: check_ea_inode");
if (!(inode->i_flags & EXT4_EA_INODE_FL))
return;
if (ctx->ea_inode_refs)
ea_refcount_fetch(ctx->ea_inode_refs, i, &actual_refs);
if (!actual_refs)
return;
/*
* There are some attribute references, link_counted is now considered
* to be 1.
*/
*link_counted = 1;
ref_count = ext2fs_get_ea_inode_ref(EXT2_INODE(inode));
/* Old Lustre-style xattr inodes do not have a stored refcount.
* However, their i_ctime and i_atime should be the same.
*/
if (ref_count != actual_refs && inode->i_ctime != inode->i_atime) {
struct problem_context pctx;
clear_problem_context(&pctx);
pctx.ino = i;
pctx.num = ref_count;
pctx.num2 = actual_refs;
if (fix_problem(ctx, PR_4_EA_INODE_REF_COUNT, &pctx)) {
ext2fs_set_ea_inode_ref(EXT2_INODE(inode), actual_refs);
e2fsck_write_inode(ctx, i, EXT2_INODE(inode), "pass4");
}
}
}
void e2fsck_pass4(e2fsck_t ctx)
{
ext2_filsys fs = ctx->fs;
ext2_ino_t i;
struct ext2_inode_large *inode;
int inode_size = EXT2_INODE_SIZE(fs->super);
#ifdef RESOURCE_TRACK
struct resource_track rtrack;
#endif
struct problem_context pctx;
__u16 link_count, link_counted;
char *buf = 0;
dgrp_t group, maxgroup;
init_resource_track(&rtrack, ctx->fs->io);
#ifdef MTRACE
mtrace_print("Pass 4");
#endif
/*
* Since pass4 is mostly CPU bound, start readahead of bitmaps
* ahead of pass 5 if we haven't already loaded them.
*/
if (ctx->readahead_kb &&
(fs->block_map == NULL || fs->inode_map == NULL))
e2fsck_readahead(fs, E2FSCK_READA_BBITMAP |
E2FSCK_READA_IBITMAP,
0, fs->group_desc_count);
clear_problem_context(&pctx);
if (!(ctx->options & E2F_OPT_PREEN))
fix_problem(ctx, PR_4_PASS_HEADER, &pctx);
group = 0;
maxgroup = fs->group_desc_count;
if (ctx->progress)
if ((ctx->progress)(ctx, 4, 0, maxgroup))
return;
inode = e2fsck_allocate_memory(ctx, inode_size, "scratch inode");
/* Protect loop from wrap-around if s_inodes_count maxed */
for (i=1; i <= fs->super->s_inodes_count && i > 0; i++) {
int isdir;
if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
goto errout;
if ((i % fs->super->s_inodes_per_group) == 0) {
group++;
if (ctx->progress)
if ((ctx->progress)(ctx, 4, group, maxgroup))
goto errout;
}
if (i == quota_type2inum(PRJQUOTA, ctx->fs->super) ||
i == EXT2_BAD_INO ||
(i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super)))
continue;
if (!(ext2fs_test_inode_bitmap2(ctx->inode_used_map, i)) ||
(ctx->inode_imagic_map &&
ext2fs_test_inode_bitmap2(ctx->inode_imagic_map, i)) ||
(ctx->inode_bb_map &&
ext2fs_test_inode_bitmap2(ctx->inode_bb_map, i)))
continue;
ext2fs_icount_fetch(ctx->inode_link_info, i, &link_count);
ext2fs_icount_fetch(ctx->inode_count, i, &link_counted);
if (link_counted == 0) {
/*
* link_counted is expected to be 0 for an ea_inode.
* check_ea_inode() will update link_counted if
* necessary.
*/
check_ea_inode(ctx, i, inode, &link_counted);
}
if (link_counted == 0) {
if (!buf)
buf = e2fsck_allocate_memory(ctx,
fs->blocksize, "bad_inode buffer");
if (e2fsck_process_bad_inode(ctx, 0, i, buf))
continue;
if (disconnect_inode(ctx, i, inode))
continue;
ext2fs_icount_fetch(ctx->inode_link_info, i,
&link_count);
ext2fs_icount_fetch(ctx->inode_count, i,
&link_counted);
}
isdir = ext2fs_test_inode_bitmap2(ctx->inode_dir_map, i);
if (isdir && (link_counted > EXT2_LINK_MAX))
link_counted = 1;
if (link_counted != link_count) {
e2fsck_read_inode_full(ctx, i, EXT2_INODE(inode),
inode_size, "pass4");
pctx.ino = i;
pctx.inode = EXT2_INODE(inode);
if ((link_count != inode->i_links_count) && !isdir &&
(inode->i_links_count <= EXT2_LINK_MAX)) {
pctx.num = link_count;
fix_problem(ctx,
PR_4_INCONSISTENT_COUNT, &pctx);
}
pctx.num = link_counted;
/* i_link_count was previously exceeded, but no longer
* is, fix this but don't consider it an error */
if ((isdir && link_counted > 1 &&
(inode->i_flags & EXT2_INDEX_FL) &&
link_count == 1 && !(ctx->options & E2F_OPT_NO)) ||
fix_problem(ctx, PR_4_BAD_REF_COUNT, &pctx)) {
inode->i_links_count = link_counted;
e2fsck_write_inode_full(ctx, i,
EXT2_INODE(inode),
inode_size, "pass4");
}
}
}
ext2fs_free_icount(ctx->inode_link_info); ctx->inode_link_info = 0;
ext2fs_free_icount(ctx->inode_count); ctx->inode_count = 0;
ext2fs_free_inode_bitmap(ctx->inode_bb_map);
ctx->inode_bb_map = 0;
ea_refcount_free(ctx->ea_inode_refs);
ctx->ea_inode_refs = 0;
ext2fs_free_inode_bitmap(ctx->inode_imagic_map);
ctx->inode_imagic_map = 0;
errout:
if (buf)
ext2fs_free_mem(&buf);
ext2fs_free_mem(&inode);
print_resource_track(ctx, _("Pass 4"), &rtrack, ctx->fs->io);
}