1 /*
2 * pass4.c -- pass #4 of e2fsck: Check reference counts
3 *
4 * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 *
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 */
15
16 #include "e2fsck.h"
17 #include "problem.h"
18 #include <ext2fs/ext2_ext_attr.h>
19
20 /*
21 * This routine is called when an inode is not connected to the
22 * directory tree.
23 *
24 * This subroutine returns 1 then the caller shouldn't bother with the
25 * rest of the pass 4 tests.
26 */
disconnect_inode(e2fsck_t ctx,ext2_ino_t i,struct ext2_inode * inode)27 static int disconnect_inode(e2fsck_t ctx, ext2_ino_t i,
28 struct ext2_inode *inode)
29 {
30 ext2_filsys fs = ctx->fs;
31 struct problem_context pctx;
32 __u32 eamagic = 0;
33 int extra_size = 0;
34
35 if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE) {
36 e2fsck_read_inode_full(ctx, i, inode,EXT2_INODE_SIZE(fs->super),
37 "pass4: disconnect_inode");
38 extra_size = ((struct ext2_inode_large *)inode)->i_extra_isize;
39 } else {
40 e2fsck_read_inode(ctx, i, inode, "pass4: disconnect_inode");
41 }
42 clear_problem_context(&pctx);
43 pctx.ino = i;
44 pctx.inode = inode;
45
46 if (EXT2_INODE_SIZE(fs->super) -EXT2_GOOD_OLD_INODE_SIZE -extra_size >0)
47 eamagic = *(__u32 *)(((char *)inode) +EXT2_GOOD_OLD_INODE_SIZE +
48 extra_size);
49 /*
50 * Offer to delete any zero-length files that does not have
51 * blocks. If there is an EA block, it might have useful
52 * information, so we won't prompt to delete it, but let it be
53 * reconnected to lost+found.
54 */
55 if (!inode->i_blocks && eamagic != EXT2_EXT_ATTR_MAGIC &&
56 (LINUX_S_ISREG(inode->i_mode) || LINUX_S_ISDIR(inode->i_mode))) {
57 if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) {
58 e2fsck_clear_inode(ctx, i, inode, 0,
59 "disconnect_inode");
60 /*
61 * Fix up the bitmaps...
62 */
63 e2fsck_read_bitmaps(ctx);
64 ext2fs_inode_alloc_stats2(fs, i, -1,
65 LINUX_S_ISDIR(inode->i_mode));
66 quota_data_inodes(ctx->qctx, inode, i, -1);
67 return 0;
68 }
69 }
70
71 /*
72 * Prompt to reconnect.
73 */
74 if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) {
75 if (e2fsck_reconnect_file(ctx, i))
76 ext2fs_unmark_valid(fs);
77 } else {
78 /*
79 * If we don't attach the inode, then skip the
80 * i_links_test since there's no point in trying to
81 * force i_links_count to zero.
82 */
83 ext2fs_unmark_valid(fs);
84 return 1;
85 }
86 return 0;
87 }
88
89
e2fsck_pass4(e2fsck_t ctx)90 void e2fsck_pass4(e2fsck_t ctx)
91 {
92 ext2_filsys fs = ctx->fs;
93 ext2_ino_t i;
94 struct ext2_inode *inode;
95 #ifdef RESOURCE_TRACK
96 struct resource_track rtrack;
97 #endif
98 struct problem_context pctx;
99 __u16 link_count, link_counted;
100 char *buf = 0;
101 dgrp_t group, maxgroup;
102
103 init_resource_track(&rtrack, ctx->fs->io);
104
105 #ifdef MTRACE
106 mtrace_print("Pass 4");
107 #endif
108
109 clear_problem_context(&pctx);
110
111 if (!(ctx->options & E2F_OPT_PREEN))
112 fix_problem(ctx, PR_4_PASS_HEADER, &pctx);
113
114 group = 0;
115 maxgroup = fs->group_desc_count;
116 if (ctx->progress)
117 if ((ctx->progress)(ctx, 4, 0, maxgroup))
118 return;
119
120 inode = e2fsck_allocate_memory(ctx, EXT2_INODE_SIZE(fs->super),
121 "scratch inode");
122
123 /* Protect loop from wrap-around if s_inodes_count maxed */
124 for (i=1; i <= fs->super->s_inodes_count && i > 0; i++) {
125 int isdir;
126
127 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
128 goto errout;
129 if ((i % fs->super->s_inodes_per_group) == 0) {
130 group++;
131 if (ctx->progress)
132 if ((ctx->progress)(ctx, 4, group, maxgroup))
133 goto errout;
134 }
135 if (i == EXT2_BAD_INO ||
136 (i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super)))
137 continue;
138 if (!(ext2fs_test_inode_bitmap2(ctx->inode_used_map, i)) ||
139 (ctx->inode_imagic_map &&
140 ext2fs_test_inode_bitmap2(ctx->inode_imagic_map, i)) ||
141 (ctx->inode_bb_map &&
142 ext2fs_test_inode_bitmap2(ctx->inode_bb_map, i)))
143 continue;
144 ext2fs_icount_fetch(ctx->inode_link_info, i, &link_count);
145 ext2fs_icount_fetch(ctx->inode_count, i, &link_counted);
146 if (link_counted == 0) {
147 if (!buf)
148 buf = e2fsck_allocate_memory(ctx,
149 fs->blocksize, "bad_inode buffer");
150 if (e2fsck_process_bad_inode(ctx, 0, i, buf))
151 continue;
152 if (disconnect_inode(ctx, i, inode))
153 continue;
154 ext2fs_icount_fetch(ctx->inode_link_info, i,
155 &link_count);
156 ext2fs_icount_fetch(ctx->inode_count, i,
157 &link_counted);
158 }
159 isdir = ext2fs_test_inode_bitmap2(ctx->inode_dir_map, i);
160 if (isdir && (link_counted > EXT2_LINK_MAX))
161 link_counted = 1;
162 if (link_counted != link_count) {
163 e2fsck_read_inode(ctx, i, inode, "pass4");
164 pctx.ino = i;
165 pctx.inode = inode;
166 if ((link_count != inode->i_links_count) && !isdir &&
167 (inode->i_links_count <= EXT2_LINK_MAX)) {
168 pctx.num = link_count;
169 fix_problem(ctx,
170 PR_4_INCONSISTENT_COUNT, &pctx);
171 }
172 pctx.num = link_counted;
173 /* i_link_count was previously exceeded, but no longer
174 * is, fix this but don't consider it an error */
175 if ((isdir && link_counted > 1 &&
176 (inode->i_flags & EXT2_INDEX_FL) &&
177 link_count == 1 && !(ctx->options & E2F_OPT_NO)) ||
178 fix_problem(ctx, PR_4_BAD_REF_COUNT, &pctx)) {
179 inode->i_links_count = link_counted;
180 e2fsck_write_inode(ctx, i, inode, "pass4");
181 }
182 }
183 }
184 ext2fs_free_icount(ctx->inode_link_info); ctx->inode_link_info = 0;
185 ext2fs_free_icount(ctx->inode_count); ctx->inode_count = 0;
186 ext2fs_free_inode_bitmap(ctx->inode_bb_map);
187 ctx->inode_bb_map = 0;
188 ext2fs_free_inode_bitmap(ctx->inode_imagic_map);
189 ctx->inode_imagic_map = 0;
190 errout:
191 if (buf)
192 ext2fs_free_mem(&buf);
193
194 ext2fs_free_mem(&inode);
195 print_resource_track(ctx, _("Pass 4"), &rtrack, ctx->fs->io);
196 }
197
198