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 * - Ref counts for ea_inodes. (ea_inode_refs)
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_large *inode)
32 ext2_filsys fs = ctx->fs;
33 struct problem_context pctx;
37 e2fsck_read_inode_full(ctx, i, EXT2_INODE(inode),
38 EXT2_INODE_SIZE(fs->super),
39 "pass4: disconnect_inode");
40 if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE)
41 extra_size = inode->i_extra_isize;
43 clear_problem_context(&pctx);
45 pctx.inode = EXT2_INODE(inode);
47 if (EXT2_INODE_SIZE(fs->super) -EXT2_GOOD_OLD_INODE_SIZE -extra_size >0)
48 eamagic = *(__u32 *)(((char *)inode) +EXT2_GOOD_OLD_INODE_SIZE +
51 * Offer to delete any zero-length files that does not have
52 * blocks. If there is an EA block, it might have useful
53 * information, so we won't prompt to delete it, but let it be
54 * reconnected to lost+found.
56 if (!inode->i_blocks && eamagic != EXT2_EXT_ATTR_MAGIC &&
57 (LINUX_S_ISREG(inode->i_mode) || LINUX_S_ISDIR(inode->i_mode))) {
58 if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) {
59 e2fsck_clear_inode(ctx, i, EXT2_INODE(inode), 0,
62 * Fix up the bitmaps...
64 e2fsck_read_bitmaps(ctx);
65 ext2fs_inode_alloc_stats2(fs, i, -1,
66 LINUX_S_ISDIR(inode->i_mode));
67 quota_data_inodes(ctx->qctx, inode, i, -1);
73 * Prompt to reconnect.
75 if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) {
76 if (e2fsck_reconnect_file(ctx, i))
77 ext2fs_unmark_valid(fs);
80 * If we don't attach the inode, then skip the
81 * i_links_test since there's no point in trying to
82 * force i_links_count to zero.
84 ext2fs_unmark_valid(fs);
90 static void check_ea_inode(e2fsck_t ctx, ext2_ino_t i,
91 struct ext2_inode_large *inode, __u16 *link_counted)
93 __u64 actual_refs = 0;
97 * This function is called when link_counted is zero. So this may not
98 * be an xattr inode at all. Return immediately if EA_INODE flag is not
101 e2fsck_read_inode_full(ctx, i, EXT2_INODE(inode),
102 EXT2_INODE_SIZE(ctx->fs->super),
103 "pass4: check_ea_inode");
104 if (!(inode->i_flags & EXT4_EA_INODE_FL))
107 if (ctx->ea_inode_refs)
108 ea_refcount_fetch(ctx->ea_inode_refs, i, &actual_refs);
113 * There are some attribute references, link_counted is now considered
118 ref_count = ext2fs_get_ea_inode_ref(EXT2_INODE(inode));
120 /* Old Lustre-style xattr inodes do not have a stored refcount.
121 * However, their i_ctime and i_atime should be the same.
123 if (ref_count != actual_refs && inode->i_ctime != inode->i_atime) {
124 struct problem_context pctx;
126 clear_problem_context(&pctx);
128 pctx.num = ref_count;
129 pctx.num2 = actual_refs;
130 if (fix_problem(ctx, PR_4_EA_INODE_REF_COUNT, &pctx)) {
131 ext2fs_set_ea_inode_ref(EXT2_INODE(inode), actual_refs);
132 e2fsck_write_inode(ctx, i, EXT2_INODE(inode), "pass4");
137 void e2fsck_pass4(e2fsck_t ctx)
139 ext2_filsys fs = ctx->fs;
141 struct ext2_inode_large *inode;
142 int inode_size = EXT2_INODE_SIZE(fs->super);
143 #ifdef RESOURCE_TRACK
144 struct resource_track rtrack;
146 struct problem_context pctx;
147 __u16 link_count, link_counted;
150 dgrp_t group, maxgroup;
152 init_resource_track(&rtrack, ctx->fs->io);
155 mtrace_print("Pass 4");
158 * Since pass4 is mostly CPU bound, start readahead of bitmaps
159 * ahead of pass 5 if we haven't already loaded them.
161 if (ctx->readahead_kb &&
162 (fs->block_map == NULL || fs->inode_map == NULL))
163 e2fsck_readahead(fs, E2FSCK_READA_BBITMAP |
164 E2FSCK_READA_IBITMAP,
165 0, fs->group_desc_count);
167 clear_problem_context(&pctx);
169 if (!(ctx->options & E2F_OPT_PREEN))
170 fix_problem(ctx, PR_4_PASS_HEADER, &pctx);
172 dir_nlink_fs = ext2fs_has_feature_dir_nlink(fs->super);
175 maxgroup = fs->group_desc_count;
177 if ((ctx->progress)(ctx, 4, 0, maxgroup))
180 inode = e2fsck_allocate_memory(ctx, inode_size, "scratch inode");
182 /* Protect loop from wrap-around if s_inodes_count maxed */
183 for (i=1; i <= fs->super->s_inodes_count && i > 0; i++) {
186 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
188 if ((i % fs->super->s_inodes_per_group) == 0) {
191 if ((ctx->progress)(ctx, 4, group, maxgroup))
194 if (i == quota_type2inum(PRJQUOTA, ctx->fs->super) ||
196 (i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super)))
198 if (!(ext2fs_test_inode_bitmap2(ctx->inode_used_map, i)) ||
199 (ctx->inode_imagic_map &&
200 ext2fs_test_inode_bitmap2(ctx->inode_imagic_map, i)) ||
201 (ctx->inode_bb_map &&
202 ext2fs_test_inode_bitmap2(ctx->inode_bb_map, i)))
204 ext2fs_icount_fetch(ctx->inode_link_info, i, &link_count);
205 ext2fs_icount_fetch(ctx->inode_count, i, &link_counted);
207 if (link_counted == 0) {
209 * link_counted is expected to be 0 for an ea_inode.
210 * check_ea_inode() will update link_counted if
213 check_ea_inode(ctx, i, inode, &link_counted);
216 if (link_counted == 0) {
218 buf = e2fsck_allocate_memory(ctx,
219 fs->blocksize, "bad_inode buffer");
220 if (e2fsck_process_bad_inode(ctx, 0, i, buf))
222 if (disconnect_inode(ctx, i, inode))
224 ext2fs_icount_fetch(ctx->inode_link_info, i,
226 ext2fs_icount_fetch(ctx->inode_count, i,
229 isdir = ext2fs_test_inode_bitmap2(ctx->inode_dir_map, i);
230 if (isdir && (link_counted > EXT2_LINK_MAX)) {
232 fix_problem(ctx, PR_4_DIR_NLINK_FEATURE, &pctx)) {
233 ext2fs_set_feature_dir_nlink(fs->super);
234 ext2fs_mark_super_dirty(fs);
239 if (link_counted != link_count) {
242 e2fsck_read_inode_full(ctx, i, EXT2_INODE(inode),
243 inode_size, "pass4");
245 pctx.inode = EXT2_INODE(inode);
246 if ((link_count != inode->i_links_count) && !isdir &&
247 (inode->i_links_count <= EXT2_LINK_MAX)) {
248 pctx.num = link_count;
250 PR_4_INCONSISTENT_COUNT, &pctx);
252 pctx.num = link_counted;
253 /* i_link_count was previously exceeded, but no longer
254 * is, fix this but don't consider it an error */
255 if (isdir && link_counted > 1 &&
256 (inode->i_flags & EXT2_INDEX_FL) &&
258 if ((ctx->options & E2F_OPT_READONLY) == 0) {
261 PR_4_DIR_OVERFLOW_REF_COUNT,
265 fix_nlink = fix_problem(ctx, PR_4_BAD_REF_COUNT,
269 inode->i_links_count = link_counted;
270 e2fsck_write_inode_full(ctx, i,
272 inode_size, "pass4");
276 ext2fs_free_icount(ctx->inode_link_info); ctx->inode_link_info = 0;
277 ext2fs_free_icount(ctx->inode_count); ctx->inode_count = 0;
278 ext2fs_free_inode_bitmap(ctx->inode_bb_map);
279 ctx->inode_bb_map = 0;
280 ea_refcount_free(ctx->ea_inode_refs);
281 ctx->ea_inode_refs = 0;
282 ext2fs_free_inode_bitmap(ctx->inode_imagic_map);
283 ctx->inode_imagic_map = 0;
286 ext2fs_free_mem(&buf);
288 ext2fs_free_mem(&inode);
289 print_resource_track(ctx, _("Pass 4"), &rtrack, ctx->fs->io);