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, ext2_ino_t *last_ino,
30 struct ext2_inode_large *inode)
32 ext2_filsys fs = ctx->fs;
33 struct problem_context pctx;
38 e2fsck_read_inode_full(ctx, i, EXT2_INODE(inode),
39 EXT2_INODE_SIZE(fs->super),
40 "pass4: disconnect_inode");
43 if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE)
44 extra_size = inode->i_extra_isize;
46 clear_problem_context(&pctx);
48 pctx.inode = EXT2_INODE(inode);
50 if (EXT2_INODE_SIZE(fs->super) -EXT2_GOOD_OLD_INODE_SIZE -extra_size >0)
51 eamagic = *(__u32 *)(((char *)inode) +EXT2_GOOD_OLD_INODE_SIZE +
54 * Offer to delete any zero-length files that does not have
55 * blocks. If there is an EA block, it might have useful
56 * information, so we won't prompt to delete it, but let it be
57 * reconnected to lost+found.
59 if (!inode->i_blocks && eamagic != EXT2_EXT_ATTR_MAGIC &&
60 (LINUX_S_ISREG(inode->i_mode) || LINUX_S_ISDIR(inode->i_mode))) {
61 if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) {
62 e2fsck_clear_inode(ctx, i, EXT2_INODE(inode), 0,
65 * Fix up the bitmaps...
67 e2fsck_read_bitmaps(ctx);
68 ext2fs_inode_alloc_stats2(fs, i, -1,
69 LINUX_S_ISDIR(inode->i_mode));
70 quota_data_inodes(ctx->qctx, inode, i, -1);
76 * Prompt to reconnect.
78 if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) {
79 if (e2fsck_reconnect_file(ctx, i))
80 ext2fs_unmark_valid(fs);
84 * If we don't attach the inode, then skip the
85 * i_links_test since there's no point in trying to
86 * force i_links_count to zero.
88 ext2fs_unmark_valid(fs);
95 * This function is called when link_counted is zero. So this may not be
96 * an xattr inode at all. Return immediately if EA_INODE flag is not set.
98 static void check_ea_inode(e2fsck_t ctx, ext2_ino_t i, ext2_ino_t *last_ino,
99 struct ext2_inode_large *inode, __u16 *link_counted)
101 __u64 actual_refs = 0;
104 if (*last_ino != i) {
105 e2fsck_read_inode_full(ctx, i, EXT2_INODE(inode),
106 EXT2_INODE_SIZE(ctx->fs->super),
107 "pass4: check_ea_inode");
110 if (!(inode->i_flags & EXT4_EA_INODE_FL))
113 if (ctx->ea_inode_refs)
114 ea_refcount_fetch(ctx->ea_inode_refs, i, &actual_refs);
119 * There are some attribute references, link_counted is now considered
124 ref_count = ext2fs_get_ea_inode_ref(EXT2_INODE(inode));
126 /* Old Lustre-style xattr inodes do not have a stored refcount.
127 * However, their i_ctime and i_atime should be the same.
129 if (ref_count != actual_refs && inode->i_ctime != inode->i_atime) {
130 struct problem_context pctx;
132 clear_problem_context(&pctx);
134 pctx.num = ref_count;
135 pctx.num2 = actual_refs;
136 if (fix_problem(ctx, PR_4_EA_INODE_REF_COUNT, &pctx)) {
137 ext2fs_set_ea_inode_ref(EXT2_INODE(inode), actual_refs);
138 e2fsck_write_inode(ctx, i, EXT2_INODE(inode), "pass4");
143 void e2fsck_pass4(e2fsck_t ctx)
145 ext2_filsys fs = ctx->fs;
147 struct ext2_inode_large *inode;
148 int inode_size = EXT2_INODE_SIZE(fs->super);
149 #ifdef RESOURCE_TRACK
150 struct resource_track rtrack;
152 struct problem_context pctx;
153 __u16 link_count, link_counted;
156 dgrp_t group, maxgroup;
158 init_resource_track(&rtrack, ctx->fs->io);
161 mtrace_print("Pass 4");
164 * Since pass4 is mostly CPU bound, start readahead of bitmaps
165 * ahead of pass 5 if we haven't already loaded them.
167 if (ctx->readahead_kb &&
168 (fs->block_map == NULL || fs->inode_map == NULL))
169 e2fsck_readahead(fs, E2FSCK_READA_BBITMAP |
170 E2FSCK_READA_IBITMAP,
171 0, fs->group_desc_count);
173 clear_problem_context(&pctx);
175 if (!(ctx->options & E2F_OPT_PREEN))
176 fix_problem(ctx, PR_4_PASS_HEADER, &pctx);
178 dir_nlink_fs = ext2fs_has_feature_dir_nlink(fs->super);
181 maxgroup = fs->group_desc_count;
183 if ((ctx->progress)(ctx, 4, 0, maxgroup))
186 inode = e2fsck_allocate_memory(ctx, inode_size, "scratch inode");
188 /* Protect loop from wrap-around if s_inodes_count maxed */
189 for (i = 1; i <= fs->super->s_inodes_count && i > 0; i++) {
190 ext2_ino_t last_ino = 0;
193 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
195 if ((i % fs->super->s_inodes_per_group) == 0) {
198 if ((ctx->progress)(ctx, 4, group, maxgroup))
201 if (i == quota_type2inum(PRJQUOTA, ctx->fs->super) ||
202 i == fs->super->s_orphan_file_inum || i == EXT2_BAD_INO ||
203 (i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super)))
205 if (!(ext2fs_test_inode_bitmap2(ctx->inode_used_map, i)) ||
206 (ctx->inode_imagic_map &&
207 ext2fs_test_inode_bitmap2(ctx->inode_imagic_map, i)) ||
208 (ctx->inode_bb_map &&
209 ext2fs_test_inode_bitmap2(ctx->inode_bb_map, i)))
211 ext2fs_icount_fetch(ctx->inode_link_info, i, &link_count);
212 ext2fs_icount_fetch(ctx->inode_count, i, &link_counted);
214 if (link_counted == 0) {
216 * link_counted is expected to be 0 for an ea_inode.
217 * check_ea_inode() will update link_counted if
220 check_ea_inode(ctx, i, &last_ino, inode, &link_counted);
223 if (link_counted == 0) {
225 buf = e2fsck_allocate_memory(ctx,
226 fs->blocksize, "bad_inode buffer");
227 if (e2fsck_process_bad_inode(ctx, 0, i, buf))
229 if (disconnect_inode(ctx, i, &last_ino, inode))
231 ext2fs_icount_fetch(ctx->inode_link_info, i,
233 ext2fs_icount_fetch(ctx->inode_count, i,
236 isdir = ext2fs_test_inode_bitmap2(ctx->inode_dir_map, i);
237 if (isdir && (link_counted > EXT2_LINK_MAX)) {
239 fix_problem(ctx, PR_4_DIR_NLINK_FEATURE, &pctx)) {
240 ext2fs_set_feature_dir_nlink(fs->super);
241 ext2fs_mark_super_dirty(fs);
246 if (link_counted != link_count) {
250 e2fsck_read_inode_full(ctx, i,
252 inode_size, "pass4");
256 pctx.inode = EXT2_INODE(inode);
257 if ((link_count != inode->i_links_count) && !isdir &&
258 (inode->i_links_count <= EXT2_LINK_MAX)) {
259 pctx.num = link_count;
261 PR_4_INCONSISTENT_COUNT, &pctx);
263 pctx.num = link_counted;
264 /* i_link_count was previously exceeded, but no longer
265 * is, fix this but don't consider it an error */
266 if (isdir && link_counted > 1 &&
267 (inode->i_flags & EXT2_INDEX_FL) &&
269 if ((ctx->options & E2F_OPT_READONLY) == 0) {
272 PR_4_DIR_OVERFLOW_REF_COUNT,
276 fix_nlink = fix_problem(ctx, PR_4_BAD_REF_COUNT,
280 inode->i_links_count = link_counted;
281 e2fsck_write_inode_full(ctx, i,
283 inode_size, "pass4");
287 ext2fs_free_icount(ctx->inode_link_info); ctx->inode_link_info = 0;
288 ext2fs_free_icount(ctx->inode_count); ctx->inode_count = 0;
289 ext2fs_free_inode_bitmap(ctx->inode_bb_map);
290 ctx->inode_bb_map = 0;
291 ea_refcount_free(ctx->ea_inode_refs);
292 ctx->ea_inode_refs = 0;
293 ext2fs_free_inode_bitmap(ctx->inode_imagic_map);
294 ctx->inode_imagic_map = 0;
297 ext2fs_free_mem(&buf);
299 ext2fs_free_mem(&inode);
300 print_resource_track(ctx, _("Pass 4"), &rtrack, ctx->fs->io);