xref: /illumos-gate/usr/src/cmd/fs.d/ufs/fsck/pass4.c (revision 2a8bcb4efb45d99ac41c94a75c396b362c414f7f)
1 /*
2  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
3  * Use is subject to license terms.
4  */
5 
6 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
7 /*	  All Rights Reserved  	*/
8 
9 /*
10  * Copyright (c) 1980, 1986, 1990 The Regents of the University of California.
11  * All rights reserved.
12  *
13  * Redistribution and use in source and binary forms are permitted
14  * provided that: (1) source distributions retain this entire copyright
15  * notice and comment, and (2) distributions including binaries display
16  * the following acknowledgement:  ``This product includes software
17  * developed by the University of California, Berkeley and its contributors''
18  * in the documentation or other materials provided with the distribution
19  * and in all advertising materials mentioning features or use of this
20  * software. Neither the name of the University nor the names of its
21  * contributors may be used to endorse or promote products derived
22  * from this software without specific prior written permission.
23  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
24  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
25  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
26  */
27 
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <unistd.h>
31 #include <sys/param.h>
32 #include <sys/types.h>
33 #include <sys/mntent.h>
34 #include <sys/fs/ufs_fs.h>
35 #include <sys/vnode.h>
36 #include <sys/fs/ufs_inode.h>
37 #include "fsck.h"
38 
39 void
pass4(void)40 pass4(void)
41 {
42 	fsck_ino_t inumber;
43 	struct dinode *dp;
44 	struct inodesc idesc;
45 	int n, was_dir;
46 	int need_rescan;
47 	int scan_pass = 0;
48 
49 	/*
50 	 * If we clear a directory, it may have produced orphans which
51 	 * we need to go pick up.  So, do this until done.  It can be
52 	 * proven that the loop terminates because at most there can
53 	 * be lastino directories, and we only rescan if we clear a
54 	 * directory.
55 	 */
56 	do {
57 		if (debug)
58 			(void) printf("pass4 scan %d\n", scan_pass++);
59 
60 		need_rescan = 0;
61 		for (inumber = UFSROOTINO; inumber <= lastino; inumber++) {
62 			init_inodesc(&idesc);
63 			idesc.id_type = ADDR;
64 			idesc.id_func = pass4check;
65 			idesc.id_number = inumber;
66 
67 			was_dir = (statemap[inumber] & DSTATE) == DSTATE;
68 
69 			switch (statemap[inumber] & ~(INORPHAN | INDELAYD
70 			    | INZLINK)) {
71 
72 			case FZLINK:
73 			case DZLINK:
74 				/*
75 				 * INZLINK gets set if the inode claimed zero
76 				 * links when we first looked at it in pass 1.
77 				 * If lncntp[] also claims it has zero links,
78 				 * it really is unreferenced.  However, we
79 				 * could have found a link to it during one of
80 				 * the other passes, so we have to check the
81 				 * final count in lncntp[].
82 				 */
83 				if (lncntp[inumber] == 0) {
84 					clri(&idesc, "UNREF", CLRI_VERBOSE,
85 					    CLRI_NOP_OK);
86 					if (was_dir &&
87 					    (statemap[inumber] == USTATE))
88 						need_rescan = 1;
89 					break;
90 				}
91 				/* FALLTHROUGH */
92 
93 			case FSTATE:
94 			case DFOUND:
95 			case SSTATE:
96 				n = lncntp[inumber];
97 				if (n || (statemap[inumber] &
98 				    (INDELAYD | INZLINK))) {
99 					/*
100 					 * adjust() will clear the inode if
101 					 * the link count goes to zero.  If
102 					 * it isn't cleared, we need to note
103 					 * that we've adjusted the count
104 					 * already, so we don't do it again
105 					 * on a rescan.
106 					 */
107 					adjust(&idesc, n);
108 					if (was_dir &&
109 					    (statemap[inumber] == USTATE)) {
110 						need_rescan = 1;
111 					} else {
112 						TRACK_LNCNTP(inumber,
113 						    lncntp[inumber] = 0);
114 					}
115 				}
116 				break;
117 
118 			case DSTATE:
119 				clri(&idesc, "UNREF", CLRI_VERBOSE,
120 				    CLRI_NOP_OK);
121 				if (was_dir && (statemap[inumber] == USTATE))
122 					need_rescan = 1;
123 				break;
124 
125 			case DCLEAR:
126 				dp = ginode(inumber);
127 				if (dp->di_size == 0) {
128 					clri(&idesc, "ZERO LENGTH",
129 					    CLRI_VERBOSE, CLRI_NOP_CORRUPT);
130 					break;
131 				}
132 				/* FALLTHROUGH */
133 
134 			case FCLEAR:
135 				clri(&idesc, "BAD/DUP", CLRI_VERBOSE,
136 				    CLRI_NOP_CORRUPT);
137 				break;
138 
139 			case SCLEAR:
140 				clri(&idesc, "BAD", CLRI_VERBOSE,
141 				    CLRI_NOP_CORRUPT);
142 				break;
143 
144 			case USTATE:
145 				break;
146 
147 			default:
148 				errexit("BAD STATE 0x%x FOR INODE I=%d",
149 					(int)statemap[inumber], inumber);
150 			}
151 		}
152 	} while (need_rescan);
153 }
154 
155 int
pass4check(struct inodesc * idesc)156 pass4check(struct inodesc *idesc)
157 {
158 	int fragnum, cg_frag;
159 	int res = KEEPON;
160 	daddr32_t blkno = idesc->id_blkno;
161 	int cylno;
162 	struct cg *cgp = &cgrp;
163 	caddr_t err;
164 
165 	if ((idesc->id_truncto >= 0) && (idesc->id_lbn < idesc->id_truncto)) {
166 		if (debug)
167 			(void) printf(
168 		    "pass4check: skipping inode %d lbn %d with truncto %d\n",
169 			    idesc->id_number, idesc->id_lbn,
170 			    idesc->id_truncto);
171 		return (KEEPON);
172 	}
173 
174 	for (fragnum = 0; fragnum < idesc->id_numfrags; fragnum++) {
175 		if (chkrange(blkno + fragnum, 1)) {
176 			res = SKIP;
177 		} else if (testbmap(blkno + fragnum)) {
178 			/*
179 			 * The block's in use.  Remove our reference
180 			 * from it.
181 			 *
182 			 * If it wasn't a dup, or everybody's done with
183 			 * it, then this is the last reference and it's
184 			 * safe to actually deallocate the on-disk block.
185 			 *
186 			 * We depend on pass 5 resolving the on-disk bitmap
187 			 * effects.
188 			 */
189 			cg_frag = blkno + fragnum;
190 			if (!find_dup_ref(cg_frag, idesc->id_number,
191 			    idesc->id_lbn * sblock.fs_frag + fragnum,
192 			    DB_DECR)) {
193 
194 				if (debug)
195 					(void) printf("p4c marking %d avail\n",
196 					    cg_frag);
197 				clrbmap(cg_frag);
198 				n_blks--;
199 
200 				/*
201 				 * Do the same for the on-disk bitmap, so
202 				 * that we don't need another pass to figure
203 				 * out what's really being used.  We'll let
204 				 * pass5() work out the fragment/block
205 				 * accounting.
206 				 */
207 				cylno = dtog(&sblock, cg_frag);
208 				(void) getblk(&cgblk, cgtod(&sblock, cylno),
209 				    (size_t)sblock.fs_cgsize);
210 				err = cg_sanity(cgp, cylno);
211 				if (err != NULL) {
212 					pfatal("CG %d: %s\n", cylno, err);
213 					free((void *)err);
214 					if (reply("REPAIR") == 0)
215 						errexit("Program terminated.");
216 					fix_cg(cgp, cylno);
217 				}
218 				clrbit(cg_blksfree(cgp),
219 				    dtogd(&sblock, cg_frag));
220 				cgdirty();
221 
222 				res |= ALTERED;
223 			}
224 		}
225 	}
226 	return (res);
227 }
228