/* vi: set sw=4 ts=4: */ /* * fsck.c - a file system consistency checker for Linux. * * (C) 1991, 1992 Linus Torvalds. * * Licensed under GPLv2, see file LICENSE in this tarball for details. */ /* * 09.11.91 - made the first rudimentary functions * * 10.11.91 - updated, does checking, no repairs yet. * Sent out to the mailing-list for testing. * * 14.11.91 - Testing seems to have gone well. Added some * correction-code, and changed some functions. * * 15.11.91 - More correction code. Hopefully it notices most * cases now, and tries to do something about them. * * 16.11.91 - More corrections (thanks to Mika Jalava). Most * things seem to work now. Yeah, sure. * * * 19.04.92 - Had to start over again from this old version, as a * kernel bug ate my enhanced fsck in february. * * 28.02.93 - added support for different directory entry sizes.. * * Sat Mar 6 18:59:42 1993, faith@cs.unc.edu: Output namelen with * super-block information * * Sat Oct 9 11:17:11 1993, faith@cs.unc.edu: make exit status conform * to that required by fsutil * * Mon Jan 3 11:06:52 1994 - Dr. Wettstein (greg%wind.uucp@plains.nodak.edu) * Added support for file system valid flag. Also * added program_version variable and output of * program name and version number when program * is executed. * * 30.10.94 - added support for v2 filesystem * (Andreas Schwab, schwab@issan.informatik.uni-dortmund.de) * * 10.12.94 - added test to prevent checking of mounted fs adapted * from Theodore Ts'o's (tytso@athena.mit.edu) e2fsck * program. (Daniel Quinlan, quinlan@yggdrasil.com) * * 01.07.96 - Fixed the v2 fs stuff to use the right #defines and such * for modern libcs (janl@math.uio.no, Nicolai Langfeldt) * * 02.07.96 - Added C bit fiddling routines from rmk@ecs.soton.ac.uk * (Russell King). He made them for ARM. It would seem * that the ARM is powerful enough to do this in C whereas * i386 and m64k must use assembly to get it fast >:-) * This should make minix fsck system-independent. * (janl@math.uio.no, Nicolai Langfeldt) * * 04.11.96 - Added minor fixes from Andreas Schwab to avoid compiler * warnings. Added mc68k bitops from * Joerg Dorchain . * * 06.11.96 - Added v2 code submitted by Joerg Dorchain, but written by * Andreas Schwab. * * 1999-02-22 Arkadiusz Mi¶kiewicz * - added Native Language Support * * * I've had no time to add comments - hopefully the function names * are comments enough. As with all file system checkers, this assumes * the file system is quiescent - don't use it on a mounted device * unless you can be sure nobody is writing to it (and remember that the * kernel can write to it when it searches for files). * * Usage: fsck [-larvsm] device * -l for a listing of all the filenames * -a for automatic repairs (not implemented) * -r for repairs (interactive) (not implemented) * -v for verbose (tells how many files) * -s for super-block info * -m for minix-like "mode not cleared" warnings * -f force filesystem check even if filesystem marked as valid * * The device may be a block device or a image of one, but this isn't * enforced (but it's not much fun on a character device :-). */ #include "busybox.h" #include /* * This is the original minix inode layout on disk. * Note the 8-bit gid and atime and ctime. */ struct minix_inode { uint16_t i_mode; uint16_t i_uid; uint32_t i_size; uint32_t i_time; uint8_t i_gid; uint8_t i_nlinks; uint16_t i_zone[9]; }; /* * The new minix inode has all the time entries, as well as * long block numbers and a third indirect block (7+1+1+1 * instead of 7+1+1). Also, some previously 8-bit values are * now 16-bit. The inode is now 64 bytes instead of 32. */ struct minix2_inode { uint16_t i_mode; uint16_t i_nlinks; uint16_t i_uid; uint16_t i_gid; uint32_t i_size; uint32_t i_atime; uint32_t i_mtime; uint32_t i_ctime; uint32_t i_zone[10]; }; enum { MINIX_ROOT_INO = 1, MINIX_LINK_MAX = 250, MINIX2_LINK_MAX = 65530, MINIX_I_MAP_SLOTS = 8, MINIX_Z_MAP_SLOTS = 64, MINIX_SUPER_MAGIC = 0x137F, /* original minix fs */ MINIX_SUPER_MAGIC2 = 0x138F, /* minix fs, 30 char names */ MINIX2_SUPER_MAGIC = 0x2468, /* minix V2 fs */ MINIX2_SUPER_MAGIC2 = 0x2478, /* minix V2 fs, 30 char names */ MINIX_VALID_FS = 0x0001, /* Clean fs. */ MINIX_ERROR_FS = 0x0002, /* fs has errors. */ MINIX_INODES_PER_BLOCK = ((BLOCK_SIZE)/(sizeof (struct minix_inode))), MINIX2_INODES_PER_BLOCK = ((BLOCK_SIZE)/(sizeof (struct minix2_inode))), MINIX_V1 = 0x0001, /* original minix fs */ MINIX_V2 = 0x0002 /* minix V2 fs */ }; #define INODE_VERSION(inode) inode->i_sb->u.minix_sb.s_version /* * minix super-block data on disk */ struct minix_super_block { uint16_t s_ninodes; uint16_t s_nzones; uint16_t s_imap_blocks; uint16_t s_zmap_blocks; uint16_t s_firstdatazone; uint16_t s_log_zone_size; uint32_t s_max_size; uint16_t s_magic; uint16_t s_state; uint32_t s_zones; }; struct minix_dir_entry { uint16_t inode; char name[0]; }; #define NAME_MAX 255 /* # chars in a file name */ #define MINIX_INODES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct minix_inode))) #ifndef BLKGETSIZE #define BLKGETSIZE _IO(0x12,96) /* return device size */ #endif enum { ROOT_INO = 1 }; #define UPPER(size,n) ((size+((n)-1))/(n)) #define INODE_SIZE (sizeof(struct minix_inode)) #ifdef CONFIG_FEATURE_MINIX2 #define INODE_SIZE2 (sizeof(struct minix2_inode)) #define INODE_BLOCKS UPPER(INODES, (version2 ? MINIX2_INODES_PER_BLOCK \ : MINIX_INODES_PER_BLOCK)) #else #define INODE_BLOCKS UPPER(INODES, (MINIX_INODES_PER_BLOCK)) #endif #define INODE_BUFFER_SIZE (INODE_BLOCKS * BLOCK_SIZE) #define BITS_PER_BLOCK (BLOCK_SIZE<<3) static char *program_version = "1.2 - 11/11/96"; static char *device_name; static int IN; static smallint repair, automatic, verbose, list, show, warn_mode, force; static int directory, regular, blockdev, chardev, links, symlinks, total; static struct termios termios; static smallint termios_set; static smallint changed; /* flags if the filesystem has been changed */ static smallint errors_uncorrected; /* flag if some error was not corrected */ //also smallint? static int dirsize = 16; static int namelen = 14; static char *inode_buffer; #define Inode (((struct minix_inode *) inode_buffer)-1) #define Inode2 (((struct minix2_inode *) inode_buffer)-1) //xzalloc? static char super_block_buffer[BLOCK_SIZE]; #define Super (*(struct minix_super_block *)super_block_buffer) #define INODES ((unsigned long)Super.s_ninodes) #ifdef CONFIG_FEATURE_MINIX2 static smallint version2; #define ZONES ((unsigned long)(version2 ? Super.s_zones : Super.s_nzones)) #else #define ZONES ((unsigned long)(Super.s_nzones)) #endif #define IMAPS ((unsigned long)Super.s_imap_blocks) #define ZMAPS ((unsigned long)Super.s_zmap_blocks) #define FIRSTZONE ((unsigned long)Super.s_firstdatazone) #define ZONESIZE ((unsigned long)Super.s_log_zone_size) #define MAXSIZE ((unsigned long)Super.s_max_size) #define MAGIC (Super.s_magic) #define NORM_FIRSTZONE (2+IMAPS+ZMAPS+INODE_BLOCKS) static char *inode_map; static char *zone_map; static unsigned char *inode_count; static unsigned char *zone_count; static void recursive_check(unsigned int ino); #ifdef CONFIG_FEATURE_MINIX2 static void recursive_check2(unsigned int ino); #endif static int bit(char *a, unsigned int i) { return (a[i >> 3] & (1<<(i & 7))) != 0; } #define inode_in_use(x) (bit(inode_map,(x))) #define zone_in_use(x) (bit(zone_map,(x)-FIRSTZONE+1)) #define mark_inode(x) (setbit(inode_map,(x)),changed=1) #define unmark_inode(x) (clrbit(inode_map,(x)),changed=1) #define mark_zone(x) (setbit(zone_map,(x)-FIRSTZONE+1),changed=1) #define unmark_zone(x) (clrbit(zone_map,(x)-FIRSTZONE+1),changed=1) static void leave(int) ATTRIBUTE_NORETURN; static void leave(int status) { if (termios_set) tcsetattr(0, TCSANOW, &termios); exit(status); } static void die(const char *str) { bb_error_msg("%s", str); leave(8); } /* File-name data */ enum { MAX_DEPTH = 32 }; static int name_depth; static char *current_name; static char *name_component[MAX_DEPTH+1]; /* Wed Feb 9 15:17:06 MST 2000 */ /* dynamically allocate name_list (instead of making it static) */ static void alloc_current_name(void) { current_name = xmalloc(MAX_DEPTH * (BUFSIZ + 1)); current_name[0] = '/'; current_name[1] = '\0'; name_component[0] = ¤t_name[0]; } #ifdef CONFIG_FEATURE_CLEAN_UP /* execute this atexit() to deallocate name_list[] */ /* piptigger was here */ static void free_current_name(void) { free(current_name); } #endif static void push_filename(const char *name) { // /dir/dir/dir/file // ^ ^ ^ // [0] [1] [2] <-name_component[i] if (name_depth < MAX_DEPTH) { int len; char *p = name_component[name_depth]; *p++ = '/'; len = sprintf(p, "%.*s", namelen, name); name_component[name_depth + 1] = p + len; } name_depth++; } static void pop_filename(void) { name_depth--; if (name_depth < MAX_DEPTH) { *name_component[name_depth] = '\0'; if (!name_depth) { current_name[0] = '/'; current_name[1] = '\0'; } } } static int ask(const char *string, int def) { int c; if (!repair) { puts(""); errors_uncorrected = 1; return 0; } if (automatic) { puts(""); if (!def) errors_uncorrected = 1; return def; } printf(def ? "%s (y/n)? " : "%s (n/y)? ", string); for (;;) { fflush(stdout); if ((c = getchar()) == EOF) { if (!def) errors_uncorrected = 1; return def; } c = toupper(c); if (c == 'Y') { def = 1; break; } else if (c == 'N') { def = 0; break; } else if (c == ' ' || c == '\n') break; } if (def) printf("y\n"); else { printf("n\n"); errors_uncorrected = 1; } return def; } /* * Make certain that we aren't checking a filesystem that is on a * mounted partition. Code adapted from e2fsck, Copyright (C) 1993, * 1994 Theodore Ts'o. Also licensed under GPL. */ static void check_mount(void) { FILE *f; struct mntent *mnt; int cont; int fd; if ((f = setmntent(MOUNTED, "r")) == NULL) return; while ((mnt = getmntent(f)) != NULL) if (strcmp(device_name, mnt->mnt_fsname) == 0) break; endmntent(f); if (!mnt) return; /* * If the root is mounted read-only, then /etc/mtab is * probably not correct; so we won't issue a warning based on * it. */ fd = open(MOUNTED, O_RDWR); if (fd < 0 && errno == EROFS) return; else close(fd); printf("%s is mounted. ", device_name); cont = 0; if (isatty(0) && isatty(1)) cont = ask("Do you really want to continue", 0); if (!cont) { printf("Check aborted\n"); exit(0); } } /* * check_zone_nr checks to see that *nr is a valid zone nr. If it * isn't, it will possibly be repaired. Check_zone_nr sets *corrected * if an error was corrected, and returns the zone (0 for no zone * or a bad zone-number). */ static int check_zone_nr2(uint32_t *nr, smallint *corrected) { const char *msg; if (!*nr) return 0; if (*nr < FIRSTZONE) msg = "< FIRSTZONE"; else if (*nr >= ZONES) msg = ">= ZONES"; else return *nr; printf("Zone nr %s in file '%s'. ", msg, current_name); if (ask("Remove block", 1)) { *nr = 0; *corrected = 1; } return 0; } static int check_zone_nr(uint16_t *nr, smallint *corrected) { uint32_t nr32 = *nr; int r = check_zone_nr2(&nr32, corrected); *nr = (uint16_t)nr32; return r; } /* * read-block reads block nr into the buffer at addr. */ static void read_block(unsigned int nr, char *addr) { if (!nr) { memset(addr, 0, BLOCK_SIZE); return; } if (BLOCK_SIZE * nr != lseek(IN, BLOCK_SIZE * nr, SEEK_SET)) { printf("%s: cannot seek to block in file '%s'\n", bb_msg_read_error, current_name); errors_uncorrected = 1; memset(addr, 0, BLOCK_SIZE); } else if (BLOCK_SIZE != read(IN, addr, BLOCK_SIZE)) { printf("%s: bad block in file '%s'\n", bb_msg_read_error, current_name); errors_uncorrected = 1; memset(addr, 0, BLOCK_SIZE); } } /* * write_block writes block nr to disk. */ static void write_block(unsigned int nr, char *addr) { if (!nr) return; if (nr < FIRSTZONE || nr >= ZONES) { printf("Internal error: trying to write bad block\n" "Write request ignored\n"); errors_uncorrected = 1; return; } if (BLOCK_SIZE * nr != lseek(IN, BLOCK_SIZE * nr, SEEK_SET)) die("seek failed in write_block"); if (BLOCK_SIZE != write(IN, addr, BLOCK_SIZE)) { printf("%s: bad block in file '%s'\n", bb_msg_write_error, current_name); errors_uncorrected = 1; } } /* * map_block calculates the absolute block nr of a block in a file. * It sets 'changed' if the inode has needed changing, and re-writes * any indirect blocks with errors. */ static int map_block(struct minix_inode *inode, unsigned int blknr) { uint16_t ind[BLOCK_SIZE >> 1]; uint16_t dind[BLOCK_SIZE >> 1]; int block, result; smallint blk_chg; if (blknr < 7) return check_zone_nr(inode->i_zone + blknr, &changed); blknr -= 7; if (blknr < 512) { block = check_zone_nr(inode->i_zone + 7, &changed); read_block(block, (char *) ind); blk_chg = 0; result = check_zone_nr(blknr + ind, &blk_chg); if (blk_chg) write_block(block, (char *) ind); return result; } blknr -= 512; block = check_zone_nr(inode->i_zone + 8, &changed); read_block(block, (char *) dind); blk_chg = 0; result = check_zone_nr(dind + (blknr / 512), &blk_chg); if (blk_chg) write_block(block, (char *) dind); block = result; read_block(block, (char *) ind); blk_chg = 0; result = check_zone_nr(ind + (blknr % 512), &blk_chg); if (blk_chg) write_block(block, (char *) ind); return result; } #ifdef CONFIG_FEATURE_MINIX2 static int map_block2(struct minix2_inode *inode, unsigned int blknr) { uint32_t ind[BLOCK_SIZE >> 2]; uint32_t dind[BLOCK_SIZE >> 2]; uint32_t tind[BLOCK_SIZE >> 2]; int block, result; smallint blk_chg; if (blknr < 7) return check_zone_nr2(inode->i_zone + blknr, &changed); blknr -= 7; if (blknr < 256) { block = check_zone_nr2(inode->i_zone + 7, &changed); read_block(block, (char *) ind); blk_chg = 0; result = check_zone_nr2(blknr + ind, &blk_chg); if (blk_chg) write_block(block, (char *) ind); return result; } blknr -= 256; if (blknr >= 256 * 256) { block = check_zone_nr2(inode->i_zone + 8, &changed); read_block(block, (char *) dind); blk_chg = 0; result = check_zone_nr2(dind + blknr / 256, &blk_chg); if (blk_chg) write_block(block, (char *) dind); block = result; read_block(block, (char *) ind); blk_chg = 0; result = check_zone_nr2(ind + blknr % 256, &blk_chg); if (blk_chg) write_block(block, (char *) ind); return result; } blknr -= 256 * 256; block = check_zone_nr2(inode->i_zone + 9, &changed); read_block(block, (char *) tind); blk_chg = 0; result = check_zone_nr2(tind + blknr / (256 * 256), &blk_chg); if (blk_chg) write_block(block, (char *) tind); block = result; read_block(block, (char *) dind); blk_chg = 0; result = check_zone_nr2(dind + (blknr / 256) % 256, &blk_chg); if (blk_chg) write_block(block, (char *) dind); block = result; read_block(block, (char *) ind); blk_chg = 0; result = check_zone_nr2(ind + blknr % 256, &blk_chg); if (blk_chg) write_block(block, (char *) ind); return result; } #endif static void write_super_block(void) { /* * Set the state of the filesystem based on whether or not there * are uncorrected errors. The filesystem valid flag is * unconditionally set if we get this far. */ Super.s_state |= MINIX_VALID_FS; if (errors_uncorrected) Super.s_state |= MINIX_ERROR_FS; else Super.s_state &= ~MINIX_ERROR_FS; if (BLOCK_SIZE != lseek(IN, BLOCK_SIZE, SEEK_SET)) die("seek failed in write_super_block"); if (BLOCK_SIZE != write(IN, super_block_buffer, BLOCK_SIZE)) die("unable to write super-block"); } static void write_tables(void) { write_super_block(); if (IMAPS * BLOCK_SIZE != write(IN, inode_map, IMAPS * BLOCK_SIZE)) die("unable to write inode map"); if (ZMAPS * BLOCK_SIZE != write(IN, zone_map, ZMAPS * BLOCK_SIZE)) die("unable to write zone map"); if (INODE_BUFFER_SIZE != write(IN, inode_buffer, INODE_BUFFER_SIZE)) die("unable to write inodes"); } static void get_dirsize(void) { int block; char blk[BLOCK_SIZE]; int size; #ifdef CONFIG_FEATURE_MINIX2 if (version2) block = Inode2[ROOT_INO].i_zone[0]; else #endif block = Inode[ROOT_INO].i_zone[0]; read_block(block, blk); for (size = 16; size < BLOCK_SIZE; size <<= 1) { if (strcmp(blk + size + 2, "..") == 0) { dirsize = size; namelen = size - 2; return; } } /* use defaults */ } static void read_superblock(void) { if (BLOCK_SIZE != lseek(IN, BLOCK_SIZE, SEEK_SET)) die("seek failed"); if (BLOCK_SIZE != read(IN, super_block_buffer, BLOCK_SIZE)) die("unable to read super block"); /* already initialized to: namelen = 14; dirsize = 16; version2 = 0; */ if (MAGIC == MINIX_SUPER_MAGIC) { } else if (MAGIC == MINIX_SUPER_MAGIC2) { namelen = 30; dirsize = 32; #ifdef CONFIG_FEATURE_MINIX2 } else if (MAGIC == MINIX2_SUPER_MAGIC) { version2 = 1; } else if (MAGIC == MINIX2_SUPER_MAGIC2) { namelen = 30; dirsize = 32; version2 = 1; #endif } else die("bad magic number in super-block"); if (ZONESIZE != 0 || BLOCK_SIZE != 1024) die("only 1k blocks/zones supported"); if (IMAPS * BLOCK_SIZE * 8 < INODES + 1) die("bad s_imap_blocks field in super-block"); if (ZMAPS * BLOCK_SIZE * 8 < ZONES - FIRSTZONE + 1) die("bad s_zmap_blocks field in super-block"); } static void read_tables(void) { inode_map = xzalloc(IMAPS * BLOCK_SIZE); zone_map = xzalloc(ZMAPS * BLOCK_SIZE); inode_buffer = xmalloc(INODE_BUFFER_SIZE); inode_count = xmalloc(INODES + 1); zone_count = xmalloc(ZONES); if (IMAPS * BLOCK_SIZE != read(IN, inode_map, IMAPS * BLOCK_SIZE)) die("unable to read inode map"); if (ZMAPS * BLOCK_SIZE != read(IN, zone_map, ZMAPS * BLOCK_SIZE)) die("unable to read zone map"); if (INODE_BUFFER_SIZE != read(IN, inode_buffer, INODE_BUFFER_SIZE)) die("unable to read inodes"); if (NORM_FIRSTZONE != FIRSTZONE) { printf("warning: firstzone!=norm_firstzone\n"); errors_uncorrected = 1; } get_dirsize(); if (show) { printf("%ld inodes\n" "%ld blocks\n" "Firstdatazone=%ld (%ld)\n" "Zonesize=%d\n" "Maxsize=%ld\n" "Filesystem state=%d\n" "namelen=%d\n\n", INODES, ZONES, FIRSTZONE, NORM_FIRSTZONE, BLOCK_SIZE << ZONESIZE, MAXSIZE, Super.s_state, namelen); } } static struct minix_inode *get_inode(unsigned int nr) { struct minix_inode *inode; if (!nr || nr > INODES) return NULL; total++; inode = Inode + nr; if (!inode_count[nr]) { if (!inode_in_use(nr)) { printf("Inode %d is marked as 'unused', but it is used " "for file '%s'\n", nr, current_name); if (repair) { if (ask("Mark as 'in use'", 1)) mark_inode(nr); } else { errors_uncorrected = 1; } } if (S_ISDIR(inode->i_mode)) directory++; else if (S_ISREG(inode->i_mode)) regular++; else if (S_ISCHR(inode->i_mode)) chardev++; else if (S_ISBLK(inode->i_mode)) blockdev++; else if (S_ISLNK(inode->i_mode)) symlinks++; else if (S_ISSOCK(inode->i_mode)); else if (S_ISFIFO(inode->i_mode)); else { printf("%s has mode %05o\n", current_name, inode->i_mode); } } else links++; if (!++inode_count[nr]) { printf("Warning: inode count too big\n"); inode_count[nr]--; errors_uncorrected = 1; } return inode; } #ifdef CONFIG_FEATURE_MINIX2 static struct minix2_inode *get_inode2(unsigned int nr) { struct minix2_inode *inode; if (!nr || nr > INODES) return NULL; total++; inode = Inode2 + nr; if (!inode_count[nr]) { if (!inode_in_use(nr)) { printf("Inode %d is marked as 'unused', but it is used " "for file '%s'\n", nr, current_name); if (repair) { if (ask("Mark as 'in use'", 1)) mark_inode(nr); else errors_uncorrected = 1; } } if (S_ISDIR(inode->i_mode)) directory++; else if (S_ISREG(inode->i_mode)) regular++; else if (S_ISCHR(inode->i_mode)) chardev++; else if (S_ISBLK(inode->i_mode)) blockdev++; else if (S_ISLNK(inode->i_mode)) symlinks++; else if (S_ISSOCK(inode->i_mode)); else if (S_ISFIFO(inode->i_mode)); else { printf("%s has mode %05o\n", current_name, inode->i_mode); } } else links++; if (!++inode_count[nr]) { printf("Warning: inode count too big\n"); inode_count[nr]--; errors_uncorrected = 1; } return inode; } #endif static void check_root(void) { struct minix_inode *inode = Inode + ROOT_INO; if (!inode || !S_ISDIR(inode->i_mode)) die("root inode isn't a directory"); } #ifdef CONFIG_FEATURE_MINIX2 static void check_root2(void) { struct minix2_inode *inode = Inode2 + ROOT_INO; if (!inode || !S_ISDIR(inode->i_mode)) die("root inode isn't a directory"); } #endif static int add_zone(uint16_t *znr, smallint *corrected) { int result; int block; result = 0; block = check_zone_nr(znr, corrected); if (!block) return 0; if (zone_count[block]) { printf("Already used block is reused in file '%s'. ", current_name); if (ask("Clear", 1)) { *znr = 0; block = 0; *corrected = 1; return 0; } } if (!zone_in_use(block)) { printf("Block %d in file '%s' is marked as 'unused'. ", block, current_name); if (ask("Correct", 1)) mark_zone(block); } if (!++zone_count[block]) zone_count[block]--; return block; } #ifdef CONFIG_FEATURE_MINIX2 static int add_zone2(uint32_t *znr, smallint *corrected) { int result; int block; result = 0; block = check_zone_nr2(znr, corrected); if (!block) return 0; if (zone_count[block]) { printf("Already used block is reused in file '%s'. ", current_name); if (ask("Clear", 1)) { *znr = 0; block = 0; *corrected = 1; return 0; } } if (!zone_in_use(block)) { printf("Block %d in file '%s' is marked as 'unused'. ", block, current_name); if (ask("Correct", 1)) mark_zone(block); } if (!++zone_count[block]) zone_count[block]--; return block; } #endif static void add_zone_ind(uint16_t *znr, smallint *corrected) { static char blk[BLOCK_SIZE]; int i; int block; smallint chg_blk = 0; block = add_zone(znr, corrected); if (!block) return; read_block(block, blk); for (i = 0; i < (BLOCK_SIZE >> 1); i++) add_zone(i + (uint16_t *) blk, &chg_blk); if (chg_blk) write_block(block, blk); } #ifdef CONFIG_FEATURE_MINIX2 static void add_zone_ind2(uint32_t *znr, smallint *corrected) { static char blk[BLOCK_SIZE]; int i; int block; smallint chg_blk = 0; block = add_zone2(znr, corrected); if (!block) return; read_block(block, blk); for (i = 0; i < BLOCK_SIZE >> 2; i++) add_zone2(i + (uint32_t *) blk, &chg_blk); if (chg_blk) write_block(block, blk); } #endif static void add_zone_dind(uint16_t *znr, smallint *corrected) { static char blk[BLOCK_SIZE]; int i; int block; smallint chg_blk = 0; block = add_zone(znr, corrected); if (!block) return; read_block(block, blk); for (i = 0; i < (BLOCK_SIZE >> 1); i++) add_zone_ind(i + (uint16_t *) blk, &chg_blk); if (chg_blk) write_block(block, blk); } #ifdef CONFIG_FEATURE_MINIX2 static void add_zone_dind2(uint32_t *znr, smallint *corrected) { static char blk[BLOCK_SIZE]; int i; int block; smallint chg_blk = 0; block = add_zone2(znr, corrected); if (!block) return; read_block(block, blk); for (i = 0; i < BLOCK_SIZE >> 2; i++) add_zone_ind2(i + (uint32_t *) blk, &chg_blk); if (chg_blk) write_block(block, blk); } static void add_zone_tind2(uint32_t *znr, smallint *corrected) { static char blk[BLOCK_SIZE]; int i; int block; smallint chg_blk = 0; block = add_zone2(znr, corrected); if (!block) return; read_block(block, blk); for (i = 0; i < BLOCK_SIZE >> 2; i++) add_zone_dind2(i + (uint32_t *) blk, &chg_blk); if (chg_blk) write_block(block, blk); } #endif static void check_zones(unsigned int i) { struct minix_inode *inode; if (!i || i > INODES) return; if (inode_count[i] > 1) /* have we counted this file already? */ return; inode = Inode + i; if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode)) return; for (i = 0; i < 7; i++) add_zone(i + inode->i_zone, &changed); add_zone_ind(7 + inode->i_zone, &changed); add_zone_dind(8 + inode->i_zone, &changed); } #ifdef CONFIG_FEATURE_MINIX2 static void check_zones2(unsigned int i) { struct minix2_inode *inode; if (!i || i > INODES) return; if (inode_count[i] > 1) /* have we counted this file already? */ return; inode = Inode2 + i; if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode)) return; for (i = 0; i < 7; i++) add_zone2(i + inode->i_zone, &changed); add_zone_ind2(7 + inode->i_zone, &changed); add_zone_dind2(8 + inode->i_zone, &changed); add_zone_tind2(9 + inode->i_zone, &changed); } #endif static void check_file(struct minix_inode *dir, unsigned int offset) { static char blk[BLOCK_SIZE]; struct minix_inode *inode; int ino; char *name; int block; block = map_block(dir, offset / BLOCK_SIZE); read_block(block, blk); name = blk + (offset % BLOCK_SIZE) + 2; ino = *(uint16_t *) (name - 2); if (ino > INODES) { printf("%s contains a bad inode number for file '%.*s'. ", current_name, namelen, name); if (ask("Remove", 1)) { *(uint16_t *) (name - 2) = 0; write_block(block, blk); } ino = 0; } push_filename(name); inode = get_inode(ino); pop_filename(); if (!offset) { if (!inode || strcmp(".", name)) { printf("%s: bad directory: '.' isn't first\n", current_name); errors_uncorrected = 1; } else return; } if (offset == dirsize) { if (!inode || strcmp("..", name)) { printf("%s: bad directory: '..' isn't second\n", current_name); errors_uncorrected = 1; } else return; } if (!inode) return; push_filename(name); if (list) { if (verbose) printf("%6d %07o %3d ", ino, inode->i_mode, inode->i_nlinks); printf("%s%s\n", current_name, S_ISDIR(inode->i_mode) ? ":" : ""); } check_zones(ino); if (inode && S_ISDIR(inode->i_mode)) recursive_check(ino); pop_filename(); } #ifdef CONFIG_FEATURE_MINIX2 static void check_file2(struct minix2_inode *dir, unsigned int offset) { static char blk[BLOCK_SIZE]; struct minix2_inode *inode; int ino; char *name; int block; block = map_block2(dir, offset / BLOCK_SIZE); read_block(block, blk); name = blk + (offset % BLOCK_SIZE) + 2; ino = *(uint16_t *) (name - 2); if (ino > INODES) { printf("%s contains a bad inode number for file '%.*s'. ", current_name, namelen, name); if (ask("Remove", 1)) { *(uint16_t *) (name - 2) = 0; write_block(block, blk); } ino = 0; } push_filename(name); inode = get_inode2(ino); pop_filename(); if (!offset) { if (!inode || strcmp(".", name)) { printf("%s: bad directory: '.' isn't first\n", current_name); errors_uncorrected = 1; } else return; } if (offset == dirsize) { if (!inode || strcmp("..", name)) { printf("%s: bad directory: '..' isn't second\n", current_name); errors_uncorrected = 1; } else return; } if (!inode) return; push_filename(name); if (list) { if (verbose) printf("%6d %07o %3d ", ino, inode->i_mode, inode->i_nlinks); printf("%s%s\n", current_name, S_ISDIR(inode->i_mode) ? ":" : ""); } check_zones2(ino); if (inode && S_ISDIR(inode->i_mode)) recursive_check2(ino); pop_filename(); } #endif static void recursive_check(unsigned int ino) { struct minix_inode *dir; unsigned int offset; dir = Inode + ino; if (!S_ISDIR(dir->i_mode)) die("internal error"); if (dir->i_size < 2 * dirsize) { printf("%s: bad directory: size<32", current_name); errors_uncorrected = 1; } for (offset = 0; offset < dir->i_size; offset += dirsize) check_file(dir, offset); } #ifdef CONFIG_FEATURE_MINIX2 static void recursive_check2(unsigned int ino) { struct minix2_inode *dir; unsigned int offset; dir = Inode2 + ino; if (!S_ISDIR(dir->i_mode)) die("internal error"); if (dir->i_size < 2 * dirsize) { printf("%s: bad directory: size<32", current_name); errors_uncorrected = 1; } for (offset = 0; offset < dir->i_size; offset += dirsize) check_file2(dir, offset); } #endif static int bad_zone(int i) { char buffer[1024]; if (BLOCK_SIZE * i != lseek(IN, BLOCK_SIZE * i, SEEK_SET)) die("seek failed in bad_zone"); return (BLOCK_SIZE != read(IN, buffer, BLOCK_SIZE)); } static void check_counts(void) { int i; for (i = 1; i <= INODES; i++) { if (warn_mode && Inode[i].i_mode && !inode_in_use(i)) { printf("Inode %d has non-zero mode. ", i); if (ask("Clear", 1)) { Inode[i].i_mode = 0; changed = 1; } } if (!inode_count[i]) { if (!inode_in_use(i)) continue; printf("Unused inode %d is marked as 'used' in the bitmap. ", i); if (ask("Clear", 1)) unmark_inode(i); continue; } if (!inode_in_use(i)) { printf("Inode %d is used, but marked as 'unused' in the bitmap. ", i); if (ask("Set", 1)) mark_inode(i); } if (Inode[i].i_nlinks != inode_count[i]) { printf("Inode %d (mode=%07o), i_nlinks=%d, counted=%d. ", i, Inode[i].i_mode, Inode[i].i_nlinks, inode_count[i]); if (ask("Set i_nlinks to count", 1)) { Inode[i].i_nlinks = inode_count[i]; changed = 1; } } } for (i = FIRSTZONE; i < ZONES; i++) { if (zone_in_use(i) == zone_count[i]) continue; if (!zone_count[i]) { if (bad_zone(i)) continue; printf("Zone %d is marked 'in use', but no file uses it. ", i); if (ask("Unmark", 1)) unmark_zone(i); continue; } printf("Zone %d: %sin use, counted=%d\n", i, zone_in_use(i) ? "" : "not ", zone_count[i]); } } #ifdef CONFIG_FEATURE_MINIX2 static void check_counts2(void) { int i; for (i = 1; i <= INODES; i++) { if (warn_mode && Inode2[i].i_mode && !inode_in_use(i)) { printf("Inode %d has non-zero mode. ", i); if (ask("Clear", 1)) { Inode2[i].i_mode = 0; changed = 1; } } if (!inode_count[i]) { if (!inode_in_use(i)) continue; printf("Unused inode %d is marked as 'used' in the bitmap. ", i); if (ask("Clear", 1)) unmark_inode(i); continue; } if (!inode_in_use(i)) { printf("Inode %d is used, but marked as 'unused' in the bitmap. ", i); if (ask("Set", 1)) mark_inode(i); } if (Inode2[i].i_nlinks != inode_count[i]) { printf("Inode %d (mode=%07o), i_nlinks=%d, counted=%d. ", i, Inode2[i].i_mode, Inode2[i].i_nlinks, inode_count[i]); if (ask("Set i_nlinks to count", 1)) { Inode2[i].i_nlinks = inode_count[i]; changed = 1; } } } for (i = FIRSTZONE; i < ZONES; i++) { if (zone_in_use(i) == zone_count[i]) continue; if (!zone_count[i]) { if (bad_zone(i)) continue; printf("Zone %d is marked 'in use', but no file uses it. ", i); if (ask("Unmark", 1)) unmark_zone(i); continue; } printf("Zone %d: %sin use, counted=%d\n", i, zone_in_use(i) ? "" : "not ", zone_count[i]); } } #endif static void check(void) { memset(inode_count, 0, (INODES + 1) * sizeof(*inode_count)); memset(zone_count, 0, ZONES * sizeof(*zone_count)); check_zones(ROOT_INO); recursive_check(ROOT_INO); check_counts(); } #ifdef CONFIG_FEATURE_MINIX2 static void check2(void) { memset(inode_count, 0, (INODES + 1) * sizeof(*inode_count)); memset(zone_count, 0, ZONES * sizeof(*zone_count)); check_zones2(ROOT_INO); recursive_check2(ROOT_INO); check_counts2(); } #endif int fsck_minix_main(int argc, char **argv) { struct termios tmp; int retcode = 0; alloc_current_name(); #ifdef CONFIG_FEATURE_CLEAN_UP /* Don't bother to free memory. Exit does * that automagically, so we can save a few bytes */ atexit(free_current_name); #endif if (INODE_SIZE * MINIX_INODES_PER_BLOCK != BLOCK_SIZE) die("bad inode size"); #ifdef CONFIG_FEATURE_MINIX2 if (INODE_SIZE2 * MINIX2_INODES_PER_BLOCK != BLOCK_SIZE) die("bad v2 inode size"); #endif while (argc-- > 1) { argv++; if (argv[0][0] != '-') { if (device_name) bb_show_usage(); else device_name = argv[0]; } else while (*++argv[0]) switch (argv[0][0]) { case 'l': list = 1; break; case 'a': automatic = 1; repair = 1; break; case 'r': automatic = 0; repair = 1; break; case 'v': verbose = 1; break; case 's': show = 1; break; case 'm': warn_mode = 1; break; case 'f': force = 1; break; default: bb_show_usage(); } } if (!device_name) bb_show_usage(); check_mount(); /* trying to check a mounted filesystem? */ if (repair && !automatic) { if (!isatty(0) || !isatty(1)) die("need terminal for interactive repairs"); } IN = open(device_name, repair ? O_RDWR : O_RDONLY); if (IN < 0) { printf("unable to open device '%s'\n", device_name); leave(8); } sync(); /* paranoia? */ read_superblock(); /* * Determine whether or not we should continue with the checking. * This is based on the status of the filesystem valid and error * flags and whether or not the -f switch was specified on the * command line. */ printf("%s, %s\n", applet_name, program_version); if (!(Super.s_state & MINIX_ERROR_FS) && (Super.s_state & MINIX_VALID_FS) && !force ) { if (repair) printf("%s is clean, check is skipped\n", device_name); return retcode; } else if (force) printf("Forcing filesystem check on %s\n", device_name); else if (repair) printf("Filesystem on %s is dirty, needs checking\n", device_name); read_tables(); if (repair && !automatic) { tcgetattr(0, &termios); tmp = termios; tmp.c_lflag &= ~(ICANON | ECHO); tcsetattr(0, TCSANOW, &tmp); termios_set = 1; } #ifdef CONFIG_FEATURE_MINIX2 if (version2) { check_root2(); check2(); } else #endif { check_root(); check(); } if (verbose) { int i, free_cnt; for (i = 1, free_cnt = 0; i <= INODES; i++) if (!inode_in_use(i)) free_cnt++; printf("\n%6ld inodes used (%ld%%)\n", (INODES - free_cnt), 100 * (INODES - free_cnt) / INODES); for (i = FIRSTZONE, free_cnt = 0; i < ZONES; i++) if (!zone_in_use(i)) free_cnt++; printf("%6ld zones used (%ld%%)\n\n" "%6d regular files\n" "%6d directories\n" "%6d character device files\n" "%6d block device files\n" "%6d links\n" "%6d symbolic links\n" "------\n" "%6d files\n", (ZONES - free_cnt), 100 * (ZONES - free_cnt) / ZONES, regular, directory, chardev, blockdev, links - 2 * directory + 1, symlinks, total - 2 * directory + 1); } if (changed) { write_tables(); printf("FILE SYSTEM HAS BEEN CHANGED\n"); sync(); } else if (repair) write_super_block(); if (repair && !automatic) tcsetattr(0, TCSANOW, &termios); if (changed) retcode += 3; if (errors_uncorrected) retcode += 4; return retcode; }