2402aaa614
Fix a bug in fsck_ffs where if a directory somehow develops a hole (that is a block pointer that has a value of zero), fsck would give the filesystem a clean bill of health, but the kernel would panic when accessing the directory with the hole. Fsck now checks for holes in directories. If found in preen mode, fsck fails. In manual mode, it can be directed to shorten the directory to the beginning of the hole. A more complete solution would be to allocate a block to fill the hole. However, this is a lot more work for a `cannot happen' error, so the extra effort seems unwarranted.
218 lines
8.0 KiB
C
218 lines
8.0 KiB
C
/* $NetBSD: fsck.h,v 1.13 1996/10/11 20:15:46 thorpej Exp $ */
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/*
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* Copyright (c) 1980, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)fsck.h 8.1 (Berkeley) 6/5/93
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*/
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#define MAXDUP 10 /* limit on dup blks (per inode) */
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#define MAXBAD 10 /* limit on bad blks (per inode) */
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#define MAXBUFSPACE 40*1024 /* maximum space to allocate to buffers */
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#define INOBUFSIZE 56*1024 /* size of buffer to read inodes in pass1 */
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#ifndef BUFSIZ
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#define BUFSIZ 1024
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#endif
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#define USTATE 01 /* inode not allocated */
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#define FSTATE 02 /* inode is file */
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#define DSTATE 03 /* inode is directory */
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#define DFOUND 04 /* directory found during descent */
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#define DCLEAR 05 /* directory is to be cleared */
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#define FCLEAR 06 /* file is to be cleared */
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/*
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* buffer cache structure.
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*/
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struct bufarea {
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struct bufarea *b_next; /* free list queue */
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struct bufarea *b_prev; /* free list queue */
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daddr_t b_bno;
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int b_size;
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int b_errs;
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int b_flags;
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union {
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char *b_buf; /* buffer space */
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daddr_t *b_indir; /* indirect block */
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struct fs *b_fs; /* super block */
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struct cg *b_cg; /* cylinder group */
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struct dinode *b_dinode; /* inode block */
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} b_un;
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char b_dirty;
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};
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#define B_INUSE 1
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#define MINBUFS 5 /* minimum number of buffers required */
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struct bufarea bufhead; /* head of list of other blks in filesys */
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struct bufarea sblk; /* file system superblock */
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struct bufarea cgblk; /* cylinder group blocks */
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struct bufarea *pdirbp; /* current directory contents */
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struct bufarea *pbp; /* current inode block */
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struct bufarea *getdatablk __P((daddr_t, long));
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#define dirty(bp) (bp)->b_dirty = 1
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#define initbarea(bp) \
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(bp)->b_dirty = 0; \
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(bp)->b_bno = (daddr_t)-1; \
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(bp)->b_flags = 0;
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#define sbdirty() sblk.b_dirty = 1
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#define cgdirty() cgblk.b_dirty = 1
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#define sblock (*sblk.b_un.b_fs)
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#define cgrp (*cgblk.b_un.b_cg)
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enum fixstate {DONTKNOW, NOFIX, FIX, IGNORE};
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struct inodesc {
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enum fixstate id_fix; /* policy on fixing errors */
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int (*id_func) /* function to be applied to blocks of inode */
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__P((struct inodesc *));
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ino_t id_number; /* inode number described */
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ino_t id_parent; /* for DATA nodes, their parent */
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daddr_t id_blkno; /* current block number being examined */
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int id_numfrags; /* number of frags contained in block */
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quad_t id_filesize; /* for DATA nodes, the size of the directory */
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int id_loc; /* for DATA nodes, current location in dir */
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int id_entryno; /* for DATA nodes, current entry number */
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struct direct *id_dirp; /* for DATA nodes, ptr to current entry */
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char *id_name; /* for DATA nodes, name to find or enter */
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char id_type; /* type of descriptor, DATA or ADDR */
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};
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/* file types */
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#define DATA 1
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#define ADDR 2
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/*
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* Linked list of duplicate blocks.
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*
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* The list is composed of two parts. The first part of the
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* list (from duplist through the node pointed to by muldup)
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* contains a single copy of each duplicate block that has been
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* found. The second part of the list (from muldup to the end)
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* contains duplicate blocks that have been found more than once.
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* To check if a block has been found as a duplicate it is only
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* necessary to search from duplist through muldup. To find the
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* total number of times that a block has been found as a duplicate
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* the entire list must be searched for occurences of the block
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* in question. The following diagram shows a sample list where
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* w (found twice), x (found once), y (found three times), and z
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* (found once) are duplicate block numbers:
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*
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* w -> y -> x -> z -> y -> w -> y
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* ^ ^
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* | |
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* duplist muldup
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*/
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struct dups {
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struct dups *next;
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daddr_t dup;
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};
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struct dups *duplist; /* head of dup list */
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struct dups *muldup; /* end of unique duplicate dup block numbers */
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/*
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* Linked list of inodes with zero link counts.
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*/
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struct zlncnt {
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struct zlncnt *next;
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ino_t zlncnt;
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};
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struct zlncnt *zlnhead; /* head of zero link count list */
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/*
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* Inode cache data structures.
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*/
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struct inoinfo {
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struct inoinfo *i_nexthash; /* next entry in hash chain */
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struct inoinfo *i_child, *i_sibling, *i_parentp;
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ino_t i_number; /* inode number of this entry */
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ino_t i_parent; /* inode number of parent */
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ino_t i_dotdot; /* inode number of `..' */
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size_t i_isize; /* size of inode */
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u_int i_numblks; /* size of block array in bytes */
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daddr_t i_blks[1]; /* actually longer */
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} **inphead, **inpsort;
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long numdirs, listmax, inplast;
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long dev_bsize; /* computed value of DEV_BSIZE */
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long secsize; /* actual disk sector size */
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char nflag; /* assume a no response */
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char yflag; /* assume a yes response */
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int bflag; /* location of alternate super block */
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int debug; /* output debugging info */
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int cvtlevel; /* convert to newer file system format */
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int doinglevel1; /* converting to new cylinder group format */
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int doinglevel2; /* converting to new inode format */
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int newinofmt; /* filesystem has new inode format */
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int preen; /* just fix normal inconsistencies */
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char havesb; /* superblock has been read */
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char skipclean; /* skip clean file systems if preening */
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int fsmodified; /* 1 => write done to file system */
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int fsreadfd; /* file descriptor for reading file system */
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int fswritefd; /* file descriptor for writing file system */
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int rerun; /* rerun fsck. Only used in non-preen mode */
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daddr_t maxfsblock; /* number of blocks in the file system */
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char *blockmap; /* ptr to primary blk allocation map */
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ino_t maxino; /* number of inodes in file system */
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ino_t lastino; /* last inode in use */
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char *statemap; /* ptr to inode state table */
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char *typemap; /* ptr to inode type table */
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int16_t *lncntp; /* ptr to link count table */
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ino_t lfdir; /* lost & found directory inode number */
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char *lfname; /* lost & found directory name */
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int lfmode; /* lost & found directory creation mode */
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daddr_t n_blks; /* number of blocks in use */
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daddr_t n_files; /* number of files in use */
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#define clearinode(dp) (*(dp) = zino)
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struct dinode zino;
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#define setbmap(blkno) setbit(blockmap, blkno)
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#define testbmap(blkno) isset(blockmap, blkno)
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#define clrbmap(blkno) clrbit(blockmap, blkno)
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#define STOP 0x01
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#define SKIP 0x02
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#define KEEPON 0x04
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#define ALTERED 0x08
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#define FOUND 0x10
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struct dinode *ginode __P((ino_t));
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struct inoinfo *getinoinfo __P((ino_t));
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void getblk __P((struct bufarea *, daddr_t, long));
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ino_t allocino __P((ino_t, int));
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