recreate root directory if missing or trashed

[unix-history] / usr / src / sbin / fsck / main.c

diff --git a/usr/src/sbin/fsck/main.c b/usr/src/sbin/fsck/main.c
index 4fd8998..510f82b 100644 (file)
--- a/usr/src/sbin/fsck/main.c
+++ b/usr/src/sbin/fsck/main.c
@@ -1,15 +1,127 @@
 #ifndef lint
 #ifndef lint

-static char version[] = "@(#)main.c    3.1 (Berkeley) %G%";
+static char version[] = "@(#)main.c    3.3 (Berkeley) %G%";

 #endif
 
 #include <sys/param.h>
 #include <sys/inode.h>
 #include <sys/fs.h>
 #endif
 
 #include <sys/param.h>
 #include <sys/inode.h>
 #include <sys/fs.h>

+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <fstab.h>
+#include <strings.h>

 #include "fsck.h"
 
 #include "fsck.h"
 

+char   *rawname(), *unrawname(), *blockcheck();
+int    catch();
+int    (*signal())();
+
+main(argc, argv)
+       int     argc;
+       char    *argv[];
+{
+       struct fstab *fsp;
+       int pid, passno, anygtr, sumstatus;
+       char *name;
+
+       sync();
+       while (--argc > 0 && **++argv == '-') {
+               switch (*++*argv) {
+
+               case 'p':
+                       preen++;
+                       break;
+
+               case 'b':
+                       if (argv[0][1] != '\0') {
+                               bflag = atoi(argv[0]+1);
+                       } else {
+                               bflag = atoi(*++argv);
+                               argc--;
+                       }
+                       printf("Alternate super block location: %d\n", bflag);
+                       break;
+
+               case 'd':
+                       debug++;
+                       break;
+
+               case 'n':       /* default no answer flag */
+               case 'N':
+                       nflag++;
+                       yflag = 0;
+                       break;
+
+               case 'y':       /* default yes answer flag */
+               case 'Y':
+                       yflag++;
+                       nflag = 0;
+                       break;
+
+               default:
+                       errexit("%c option?\n", **argv);
+               }
+       }
+       if (signal(SIGINT, SIG_IGN) != SIG_IGN)
+               (void)signal(SIGINT, catch);
+       if (argc) {
+               while (argc-- > 0) {
+                       hotroot = 0;
+                       checkfilesys(*argv++);
+               }
+               exit(0);
+       }
+       sumstatus = 0;
+       passno = 1;
+       do {
+               anygtr = 0;
+               if (setfsent() == 0)
+                       errexit("Can't open checklist file: %s\n", FSTAB);
+               while ((fsp = getfsent()) != 0) {
+                       if (strcmp(fsp->fs_type, FSTAB_RW) &&
+                           strcmp(fsp->fs_type, FSTAB_RO) &&
+                           strcmp(fsp->fs_type, FSTAB_RQ))
+                               continue;
+                       if (preen == 0 ||
+                           passno == 1 && fsp->fs_passno == passno) {
+                               name = blockcheck(fsp->fs_spec);
+                               if (name != NULL)
+                                       checkfilesys(name);
+                               else if (preen)
+                                       exit(8);
+                       } else if (fsp->fs_passno > passno) {
+                               anygtr = 1;
+                       } else if (fsp->fs_passno == passno) {
+                               pid = fork();
+                               if (pid < 0) {
+                                       perror("fork");
+                                       exit(8);
+                               }
+                               if (pid == 0) {
+                                       name = blockcheck(fsp->fs_spec);
+                                       if (name == NULL)
+                                               exit(8);
+                                       checkfilesys(name);
+                                       exit(0);
+                               }
+                       }
+               }
+               if (preen) {
+                       union wait status;
+                       while (wait(&status) != -1)
+                               sumstatus |= status.w_retcode;
+               }
+               passno++;
+       } while (anygtr);
+       if (sumstatus)
+               exit(8);
+       (void)endfsent();
+       exit(0);
+}
+

 checkfilesys(filesys)
        char *filesys;
 {
 checkfilesys(filesys)
        char *filesys;
 {

+       daddr_t n_ffree, n_bfree;

 
        devname = filesys;
        if (setup(filesys) == 0) {
 
        devname = filesys;
        if (setup(filesys) == 0) {


@@ -17,7 +129,9 @@ checkfilesys(filesys)
                        pfatal("CAN'T CHECK FILE SYSTEM.");
                return;
        }
                        pfatal("CAN'T CHECK FILE SYSTEM.");
                return;
        }

-/* 1: scan inodes tallying blocks used */
+       /*
+        * 1: scan inodes tallying blocks used
+        */

        if (preen == 0) {
                printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
                if (hotroot)
        if (preen == 0) {
                printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
                if (hotroot)


@@ -26,7 +140,9 @@ checkfilesys(filesys)
        }
        pass1();
 
        }
        pass1();
 

-/* 1b: locate first references to duplicates, if any */
+       /*
+        * 1b: locate first references to duplicates, if any
+        */

        if (enddup != &duplist[0]) {
                if (preen)
                        pfatal("INTERNAL ERROR: dups with -p");
        if (enddup != &duplist[0]) {
                if (preen)
                        pfatal("INTERNAL ERROR: dups with -p");


@@ -34,44 +150,57 @@ checkfilesys(filesys)
                pass1b();
        }
 
                pass1b();
        }
 

-/* 2: traverse directories from root to mark all connected directories */
+       /*
+        * 2: traverse directories from root to mark all connected directories
+        */

        if (preen == 0)
                printf("** Phase 2 - Check Pathnames\n");
        pass2();
 
        if (preen == 0)
                printf("** Phase 2 - Check Pathnames\n");
        pass2();
 

-/* 3: scan inodes looking for disconnected directories */
+       /*
+        * 3: scan inodes looking for disconnected directories
+        */

        if (preen == 0)
                printf("** Phase 3 - Check Connectivity\n");
        pass3();
 
        if (preen == 0)
                printf("** Phase 3 - Check Connectivity\n");
        pass3();
 

-/* 4: scan inodes looking for disconnected files; check reference counts */
+       /*
+        * 4: scan inodes looking for disconnected files; check reference counts
+        */

        if (preen == 0)
                printf("** Phase 4 - Check Reference Counts\n");
        pass4();
 
        if (preen == 0)
                printf("** Phase 4 - Check Reference Counts\n");
        pass4();
 

-/* 5: check resource counts in cylinder groups */
+       /*
+        * 5: check and repair resource counts in cylinder groups
+        */

        if (preen == 0)
                printf("** Phase 5 - Check Cyl groups\n");
        pass5();
 
        if (preen == 0)
                printf("** Phase 5 - Check Cyl groups\n");
        pass5();
 

-       if (fixcg) {
-               if (preen == 0)
-                       printf("** Phase 6 - Salvage Cylinder Groups\n");
-               makecg();
-               n_ffree = sblock.fs_cstotal.cs_nffree;
-               n_bfree = sblock.fs_cstotal.cs_nbfree;
+       /*
+        * print out summary statistics
+        */
+       n_ffree = sblock.fs_cstotal.cs_nffree;
+       n_bfree = sblock.fs_cstotal.cs_nbfree;
+       pwarn("%d files, %d used, %d free (%d frags, %d blocks)\n", n_files,
+           n_blks, n_ffree + sblock.fs_frag * n_bfree, n_ffree, n_bfree);
+       if (debug && (n_files -= imax - ROOTINO - sblock.fs_cstotal.cs_nifree))
+               printf("%d files missing\n", n_files);
+       if (debug) {
+               n_blks += sblock.fs_ncg *
+                       (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
+               n_blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
+               n_blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
+               if (n_blks -= fmax - (n_ffree + sblock.fs_frag * n_bfree))
+                       printf("%d blocks missing\n", n_blks);

        }
        }

-
-       pwarn("%d files, %d used, %d free (%d frags, %d blocks)\n",
-           n_files, n_blks - howmany(sblock.fs_cssize, sblock.fs_fsize),
-           n_ffree + sblock.fs_frag * n_bfree, n_ffree, n_bfree);

        if (dfile.mod) {
                (void)time(&sblock.fs_time);
                sbdirty();
        }
        ckfini();
        free(blockmap);
        if (dfile.mod) {
                (void)time(&sblock.fs_time);
                sbdirty();
        }
        ckfini();
        free(blockmap);

-       free(freemap);

        free(statemap);
        free((char *)lncntp);
        if (!dfile.mod)
        free(statemap);
        free((char *)lncntp);
        if (!dfile.mod)


@@ -86,3 +215,86 @@ checkfilesys(filesys)
                exit(4);
        }
 }
                exit(4);
        }
 }

+
+char *
+blockcheck(name)
+       char *name;
+{
+       struct stat stslash, stblock, stchar;
+       char *raw;
+       int looped = 0;
+
+       hotroot = 0;
+       if (stat("/", &stslash) < 0){
+               printf("Can't stat root\n");
+               return (0);
+       }
+retry:
+       if (stat(name, &stblock) < 0){
+               printf("Can't stat %s\n", name);
+               return (0);
+       }
+       if (stblock.st_mode & S_IFBLK) {
+               raw = rawname(name);
+               if (stat(raw, &stchar) < 0){
+                       printf("Can't stat %s\n", raw);
+                       return (0);
+               }
+               if (stchar.st_mode & S_IFCHR) {
+                       if (stslash.st_dev == stblock.st_rdev) {
+                               hotroot++;
+                               raw = unrawname(name);
+                       }
+                       return (raw);
+               } else {
+                       printf("%s is not a character device\n", raw);
+                       return (0);
+               }
+       } else if (stblock.st_mode & S_IFCHR) {
+               if (looped) {
+                       printf("Can't make sense out of name %s\n", name);
+                       return (0);
+               }
+               name = unrawname(name);
+               looped++;
+               goto retry;
+       }
+       printf("Can't make sense out of name %s\n", name);
+       return (0);
+}
+
+char *
+unrawname(cp)
+       char *cp;
+{
+       char *dp = rindex(cp, '/');
+       struct stat stb;
+
+       if (dp == 0)
+               return (cp);
+       if (stat(cp, &stb) < 0)
+               return (cp);
+       if ((stb.st_mode&S_IFMT) != S_IFCHR)
+               return (cp);
+       if (*(dp+1) != 'r')
+               return (cp);
+       (void)strcpy(dp+1, dp+2);
+       return (cp);
+}
+
+char *
+rawname(cp)
+       char *cp;
+{
+       static char rawbuf[32];
+       char *dp = rindex(cp, '/');
+
+       if (dp == 0)
+               return (0);
+       *dp = 0;
+       (void)strcpy(rawbuf, cp);
+       *dp = '/';
+       (void)strcat(rawbuf, "/r");
+       (void)strcat(rawbuf, dp+1);
+       return (rawbuf);
+}