pass4.c revision 1f3ad14a5ad5df3ac4012d41ef5d76411cd8fff3 
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
19/*
20 * This routine is called when an inode is not connected to the
21 * directory tree.
22 *
23 * This subroutine returns 1 then the caller shouldn't bother with the
24 * rest of the pass 4 tests.
25 */
26static int disconnect_inode(e2fsck_t ctx, ext2_ino_t i)
27{
28	ext2_filsys fs = ctx->fs;
29	struct ext2_inode	inode;
30	struct problem_context	pctx;
31
32	e2fsck_read_inode(ctx, i, &inode, "pass4: disconnect_inode");
33	clear_problem_context(&pctx);
34	pctx.ino = i;
35	pctx.inode = &inode;
36
37	/*
38	 * Offer to delete any zero-length files that does not have
39	 * blocks.  If there is an EA block, it might have useful
40	 * information, so we won't prompt to delete it, but let it be
41	 * reconnected to lost+found.
42	 */
43	if (!inode.i_blocks && (LINUX_S_ISREG(inode.i_mode) ||
44				LINUX_S_ISDIR(inode.i_mode))) {
45		if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) {
46			ext2fs_icount_store(ctx->inode_link_info, i, 0);
47			inode.i_links_count = 0;
48			inode.i_dtime = ctx->now;
49			e2fsck_write_inode(ctx, i, &inode,
50					   "disconnect_inode");
51			/*
52			 * Fix up the bitmaps...
53			 */
54			e2fsck_read_bitmaps(ctx);
55			ext2fs_unmark_inode_bitmap(ctx->inode_used_map, i);
56			ext2fs_unmark_inode_bitmap(ctx->inode_dir_map, i);
57			ext2fs_inode_alloc_stats2(fs, i, -1,
58						  LINUX_S_ISDIR(inode.i_mode));
59			return 0;
60		}
61	}
62
63	/*
64	 * Prompt to reconnect.
65	 */
66	if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) {
67		if (e2fsck_reconnect_file(ctx, i))
68			ext2fs_unmark_valid(fs);
69	} else {
70		/*
71		 * If we don't attach the inode, then skip the
72		 * i_links_test since there's no point in trying to
73		 * force i_links_count to zero.
74		 */
75		ext2fs_unmark_valid(fs);
76		return 1;
77	}
78	return 0;
79}
80
81
82void e2fsck_pass4(e2fsck_t ctx)
83{
84	ext2_filsys fs = ctx->fs;
85	ext2_ino_t	i;
86	struct ext2_inode	inode;
87#ifdef RESOURCE_TRACK
88	struct resource_track	rtrack;
89#endif
90	struct problem_context	pctx;
91	__u16	link_count, link_counted;
92	char	*buf = 0;
93	int	group, maxgroup;
94
95#ifdef RESOURCE_TRACK
96	init_resource_track(&rtrack);
97#endif
98
99#ifdef MTRACE
100	mtrace_print("Pass 4");
101#endif
102
103	clear_problem_context(&pctx);
104
105	if (!(ctx->options & E2F_OPT_PREEN))
106		fix_problem(ctx, PR_4_PASS_HEADER, &pctx);
107
108	group = 0;
109	maxgroup = fs->group_desc_count;
110	if (ctx->progress)
111		if ((ctx->progress)(ctx, 4, 0, maxgroup))
112			return;
113
114	for (i=1; i <= fs->super->s_inodes_count; i++) {
115		if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
116			return;
117		if ((i % fs->super->s_inodes_per_group) == 0) {
118			group++;
119			if (ctx->progress)
120				if ((ctx->progress)(ctx, 4, group, maxgroup))
121					return;
122		}
123		if (i == EXT2_BAD_INO ||
124		    (i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super)))
125			continue;
126		if (!(ext2fs_test_inode_bitmap(ctx->inode_used_map, i)) ||
127		    (ctx->inode_imagic_map &&
128		     ext2fs_test_inode_bitmap(ctx->inode_imagic_map, i)) ||
129		    (ctx->inode_bb_map &&
130		     ext2fs_test_inode_bitmap(ctx->inode_bb_map, i)))
131			continue;
132		ext2fs_icount_fetch(ctx->inode_link_info, i, &link_count);
133		ext2fs_icount_fetch(ctx->inode_count, i, &link_counted);
134		if (link_counted == 0) {
135			if (!buf)
136				buf = e2fsck_allocate_memory(ctx,
137				     fs->blocksize, "bad_inode buffer");
138			if (e2fsck_process_bad_inode(ctx, 0, i, buf))
139				continue;
140			if (disconnect_inode(ctx, i))
141				continue;
142			ext2fs_icount_fetch(ctx->inode_link_info, i,
143					    &link_count);
144			ext2fs_icount_fetch(ctx->inode_count, i,
145					    &link_counted);
146		}
147		if (link_counted != link_count) {
148			e2fsck_read_inode(ctx, i, &inode, "pass4");
149			pctx.ino = i;
150			pctx.inode = &inode;
151			if (link_count != inode.i_links_count) {
152				pctx.num = link_count;
153				fix_problem(ctx,
154					    PR_4_INCONSISTENT_COUNT, &pctx);
155			}
156			pctx.num = link_counted;
157			if (fix_problem(ctx, PR_4_BAD_REF_COUNT, &pctx)) {
158				inode.i_links_count = link_counted;
159				e2fsck_write_inode(ctx, i, &inode, "pass4");
160			}
161		}
162	}
163	ext2fs_free_icount(ctx->inode_link_info); ctx->inode_link_info = 0;
164	ext2fs_free_icount(ctx->inode_count); ctx->inode_count = 0;
165	ext2fs_free_inode_bitmap(ctx->inode_bb_map);
166	ctx->inode_bb_map = 0;
167	ext2fs_free_inode_bitmap(ctx->inode_imagic_map);
168	ctx->inode_imagic_map = 0;
169	if (buf)
170		ext2fs_free_mem(&buf);
171#ifdef RESOURCE_TRACK
172	if (ctx->options & E2F_OPT_TIME2) {
173		e2fsck_clear_progbar(ctx);
174		print_resource_track(_("Pass 4"), &rtrack);
175	}
176#endif
177}
178
179