958b25be50
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
#include "fs.h"
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#include <sys/stat.h>
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#include <string.h>
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#include <minix/com.h>
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#include <minix/callnr.h>
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#include <stdlib.h>
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#include "buf.h"
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#include "inode.h"
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#include "super.h"
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#include <minix/vfsif.h>
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/*===========================================================================*
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* no_sys *
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*===========================================================================*/
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PUBLIC int no_sys()
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{
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/* Somebody has used an illegal system call number */
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printf("no_sys: invalid call %d\n", req_nr);
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return(EINVAL);
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}
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/*===========================================================================*
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* conv2 *
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*===========================================================================*/
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PUBLIC unsigned conv2(norm, w)
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int norm; /* TRUE if no swap, FALSE for byte swap */
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int w; /* promotion of 16-bit word to be swapped */
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{
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/* Possibly swap a 16-bit word between 8086 and 68000 byte order. */
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if (norm) return( (unsigned) w & 0xFFFF);
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return( ((w&BYTE) << 8) | ( (w>>8) & BYTE));
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}
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/*===========================================================================*
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* conv4 *
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*===========================================================================*/
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PUBLIC long conv4(norm, x)
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int norm; /* TRUE if no swap, FALSE for byte swap */
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long x; /* 32-bit long to be byte swapped */
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{
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/* Possibly swap a 32-bit long between 8086 and 68000 byte order. */
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unsigned lo, hi;
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long l;
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if (norm) return(x); /* byte order was already ok */
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lo = conv2(FALSE, (int) x & 0xFFFF); /* low-order half, byte swapped */
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hi = conv2(FALSE, (int) (x>>16) & 0xFFFF); /* high-order half, swapped */
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l = ( (long) lo <<16) | hi;
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return(l);
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}
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/*===========================================================================*
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* clock_time *
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*===========================================================================*/
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PUBLIC time_t clock_time()
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{
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/* This routine returns the time in seconds since 1.1.1970. MINIX is an
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* astrophysically naive system that assumes the earth rotates at a constant
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* rate and that such things as leap seconds do not exist.
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*/
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register int k;
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clock_t uptime;
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if (use_getuptime2) {
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if ( (k=getuptime2(&uptime,&boottime)) != OK)
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panic(__FILE__,"clock_time: getuptme2 failed", k);
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} else {
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if ( (k=getuptime(&uptime)) != OK)
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panic(__FILE__,"clock_time err", k);
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}
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return( (time_t) (boottime + (uptime/sys_hz())));
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}
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/*===========================================================================*
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* mfs_min *
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*===========================================================================*/
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PUBLIC int mfs_min_f(char *file, int line, int v1, int v2)
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{
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if(v1 < 0 || v2 < 0) {
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printf("mfs:%s:%d: strange string lengths: %d, %d\n",
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file, line, v1, v2);
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panic(file, "strange string lengths", NO_NUM);
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}
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if(v2 >= v1) return v1;
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return v2;
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}
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/*===========================================================================*
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* mfs_nul *
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*===========================================================================*/
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PUBLIC void mfs_nul_f(char *file, int line, char *str, int len, int maxlen)
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{
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if(len < 1) {
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printf("mfs:%s:%d: %d-length string?!\n", file, line, len);
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panic(file, "strange string length", NO_NUM);
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}
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if(len < maxlen && str[len-1] != '\0') {
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printf("mfs:%s:%d: string (length %d, maxlen %d) "
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"not null-terminated\n",
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file, line, len, maxlen);
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}
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}
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#define MYASSERT(c) if(!(c)) { printf("MFS:%s:%d: sanity check: %s failed\n", \
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file, line, #c); panic("MFS", "sanity check " #c " failed", __LINE__); }
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/*===========================================================================*
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* sanity_check *
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*===========================================================================*/
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PUBLIC void sanitycheck(char *file, int line)
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{
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MYASSERT(SELF_E > 0);
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if(superblock.s_dev != NO_DEV) {
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MYASSERT(superblock.s_dev == fs_dev);
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MYASSERT(superblock.s_block_size == fs_block_size);
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} else {
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MYASSERT(_MIN_BLOCK_SIZE == fs_block_size);
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}
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}
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