2 * pass4.c -- pass #4 of e2fsck: Check reference counts
4 * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o.
7 * This file may be redistributed under the terms of the GNU Public
11 * Pass 4 frees the following data structures:
12 * - A bitmap of which inodes are in bad blocks. (inode_bb_map)
13 * - A bitmap of which inodes are imagic inodes. (inode_imagic_map)
14 * - A bitmap of EA inodes. (inode_ea_map)
20 #include <ext2fs/ext2_ext_attr.h>
23 * This routine is called when an inode is not connected to the
26 * This subroutine returns 1 then the caller shouldn't bother with the
27 * rest of the pass 4 tests.
29 static int disconnect_inode(e2fsck_t ctx, ext2_ino_t i,
30 struct ext2_inode *inode)
32 ext2_filsys fs = ctx->fs;
33 struct problem_context pctx;
37 if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE) {
38 e2fsck_read_inode_full(ctx, i, inode,EXT2_INODE_SIZE(fs->super),
39 "pass4: disconnect_inode");
40 extra_size = ((struct ext2_inode_large *)inode)->i_extra_isize;
42 e2fsck_read_inode(ctx, i, inode, "pass4: disconnect_inode");
45 if (inode->i_flags & EXT4_EA_INODE_FL) {
46 if (ext2fs_test_inode_bitmap2(ctx->inode_ea_map, i)) {
47 ext2fs_icount_store(ctx->inode_count, i, 1);
50 /* Zero the link count so that when inode is linked to
51 * lost+found it has correct link count */
52 inode->i_links_count = 0;
53 e2fsck_write_inode(ctx, i, inode, "disconnect_inode");
54 ext2fs_icount_store(ctx->inode_link_info, i, 0);
58 clear_problem_context(&pctx);
62 if (EXT2_INODE_SIZE(fs->super) -EXT2_GOOD_OLD_INODE_SIZE -extra_size >0)
63 eamagic = *(__u32 *)(((char *)inode) +EXT2_GOOD_OLD_INODE_SIZE +
66 * Offer to delete any zero-length files that does not have
67 * blocks. If there is an EA block, it might have useful
68 * information, so we won't prompt to delete it, but let it be
69 * reconnected to lost+found.
71 if (!inode->i_blocks && eamagic != EXT2_EXT_ATTR_MAGIC &&
72 (LINUX_S_ISREG(inode->i_mode) || LINUX_S_ISDIR(inode->i_mode))) {
73 if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) {
74 e2fsck_clear_inode(ctx, i, inode, 0,
77 * Fix up the bitmaps...
79 e2fsck_read_bitmaps(ctx);
80 ext2fs_inode_alloc_stats2(fs, i, -1,
81 LINUX_S_ISDIR(inode->i_mode));
82 quota_data_inodes(ctx->qctx, inode, i, -1);
88 * Prompt to reconnect.
90 if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) {
91 if (e2fsck_reconnect_file(ctx, i))
92 ext2fs_unmark_valid(fs);
95 * If we don't attach the inode, then skip the
96 * i_links_test since there's no point in trying to
97 * force i_links_count to zero.
99 ext2fs_unmark_valid(fs);
106 void e2fsck_pass4(e2fsck_t ctx)
108 ext2_filsys fs = ctx->fs;
110 struct ext2_inode *inode;
111 #ifdef RESOURCE_TRACK
112 struct resource_track rtrack;
114 struct problem_context pctx;
115 __u16 link_count, link_counted;
119 init_resource_track(&rtrack, ctx->fs->io);
122 mtrace_print("Pass 4");
125 clear_problem_context(&pctx);
127 if (!(ctx->options & E2F_OPT_PREEN))
128 fix_problem(ctx, PR_4_PASS_HEADER, &pctx);
131 maxgroup = fs->group_desc_count;
133 if ((ctx->progress)(ctx, 4, 0, maxgroup))
136 inode = e2fsck_allocate_memory(ctx, EXT2_INODE_SIZE(fs->super),
139 /* Protect loop from wrap-around if s_inodes_count maxed */
140 for (i=1; i <= fs->super->s_inodes_count && i > 0; i++) {
141 int isdir = ext2fs_test_inode_bitmap2(ctx->inode_dir_map, i);
143 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
145 if ((i % fs->super->s_inodes_per_group) == 0) {
148 if ((ctx->progress)(ctx, 4, group, maxgroup))
151 if (i == EXT2_BAD_INO ||
152 (i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super)))
154 if (!(ext2fs_test_inode_bitmap2(ctx->inode_used_map, i)) ||
155 (ctx->inode_imagic_map &&
156 ext2fs_test_inode_bitmap2(ctx->inode_imagic_map, i)) ||
157 (ctx->inode_bb_map &&
158 ext2fs_test_inode_bitmap2(ctx->inode_bb_map, i)))
160 ext2fs_icount_fetch(ctx->inode_link_info, i, &link_count);
161 ext2fs_icount_fetch(ctx->inode_count, i, &link_counted);
162 if (link_counted == 0) {
164 buf = e2fsck_allocate_memory(ctx,
165 fs->blocksize, "bad_inode buffer");
166 if (e2fsck_process_bad_inode(ctx, 0, i, buf))
168 if (disconnect_inode(ctx, i, inode))
170 ext2fs_icount_fetch(ctx->inode_link_info, i,
172 ext2fs_icount_fetch(ctx->inode_count, i,
175 if (isdir && (link_counted > EXT2_LINK_MAX))
177 if (link_counted != link_count) {
178 e2fsck_read_inode(ctx, i, inode, "pass4");
181 if ((link_count != inode->i_links_count) && !isdir &&
182 (inode->i_links_count <= EXT2_LINK_MAX)) {
183 pctx.num = link_count;
185 PR_4_INCONSISTENT_COUNT, &pctx);
187 pctx.num = link_counted;
188 /* i_link_count was previously exceeded, but no longer
189 * is, fix this but don't consider it an error */
190 if ((isdir && link_counted > 1 &&
191 (inode->i_flags & EXT2_INDEX_FL) &&
192 link_count == 1 && !(ctx->options & E2F_OPT_NO)) ||
193 fix_problem(ctx, PR_4_BAD_REF_COUNT, &pctx)) {
194 inode->i_links_count = link_counted;
195 e2fsck_write_inode(ctx, i, inode, "pass4");
199 ext2fs_free_icount(ctx->inode_link_info); ctx->inode_link_info = 0;
200 ext2fs_free_icount(ctx->inode_count); ctx->inode_count = 0;
201 ext2fs_free_icount(ctx->inode_badness); ctx->inode_badness = 0;
202 ext2fs_free_inode_bitmap(ctx->inode_ea_map);
203 ctx->inode_ea_map = 0;
204 ext2fs_free_inode_bitmap(ctx->inode_bb_map);
205 ctx->inode_bb_map = 0;
206 ext2fs_free_inode_bitmap(ctx->inode_imagic_map);
207 ctx->inode_imagic_map = 0;
210 ext2fs_free_mem(&buf);
212 ext2fs_free_mem(&inode);
213 print_resource_track(ctx, _("Pass 4"), &rtrack, ctx->fs->io);