2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/* This procedure examines a file system and figures out whether it is
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* version 1 or version 2. It returns the result as an int. If the
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* file system is neither, it returns -1. A typical call is:
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*
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* n = fsversion("/dev/hd1", "df");
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*
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* The first argument is the special file for the file system.
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* The second is the program name, which is used in error messages.
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*/
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#include <sys/types.h>
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/minlib.h>
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#include <minix/type.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include "mfs/const.h"
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static char super[SUPER_BLOCK_BYTES];
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#define MAGIC_OFFSET_MFS 0x18
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#define MAGIC_OFFSET_EXT 0x38
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#define MAGIC_VALUE_EXT2 0xef53
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static int check_super(off_t offset, unsigned short magic)
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{
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return (memcmp(super + offset, &magic, sizeof(magic)) == 0) ? 1 : 0;
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}
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int fsversion(dev, prog)
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char *dev, *prog;
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{
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int fd;
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if ((fd = open(dev, O_RDONLY)) < 0) {
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std_err(prog);
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std_err(" cannot open ");
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perror(dev);
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return(-1);
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}
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lseek(fd, (off_t) SUPER_BLOCK_BYTES, SEEK_SET); /* skip boot block */
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if (read(fd, (char *) &super, sizeof(super)) != sizeof(super)) {
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std_err(prog);
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std_err(" cannot read super block on ");
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perror(dev);
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close(fd);
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return(-1);
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}
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close(fd);
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/* first check MFS, a valid MFS may look like EXT but not vice versa */
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if (check_super(MAGIC_OFFSET_MFS, SUPER_MAGIC)) return FSVERSION_MFS1;
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if (check_super(MAGIC_OFFSET_MFS, SUPER_V2)) return FSVERSION_MFS2;
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if (check_super(MAGIC_OFFSET_MFS, SUPER_V3)) return FSVERSION_MFS3;
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if (check_super(MAGIC_OFFSET_EXT, MAGIC_VALUE_EXT2)) return FSVERSION_EXT2;
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return(-1);
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}
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