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freebsd/sys/dev/vinum/vinumio.c
Greg Lehey e4381fa521 Import base vinum lkm sources
1998-09-16 05:56:21 +00:00

887 lines
29 KiB
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/*-
* Copyright (c) 1997, 1998
* Nan Yang Computer Services Limited. All rights reserved.
*
* This software is distributed under the so-called ``Berkeley
* License'':
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Nan Yang Computer
* Services Limited.
* 4. Neither the name of the Company nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* This software is provided ``as is'', and any express or implied
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose are disclaimed.
* In no event shall the company or contributors be liable for any
* direct, indirect, incidental, special, exemplary, or consequential
* damages (including, but not limited to, procurement of substitute
* goods or services; loss of use, data, or profits; or business
* interruption) however caused and on any theory of liability, whether
* in contract, strict liability, or tort (including negligence or
* otherwise) arising in any way out of the use of this software, even if
* advised of the possibility of such damage.
*
* $Id: io.c,v 1.16 1998/08/10 23:47:21 grog Exp grog $
*/
#define STATIC /* nothing while we're testing XXX */
#if __FreeBSD__ < 3 /* this is in sys/disklabel.h in 3.0 and on */
#define DTYPE_VINUM 12 /* vinum volume */
#endif
#define REALLYKERNEL
#include "vinumhdr.h"
#include <miscfs/specfs/specdev.h>
extern jmp_buf command_fail; /* return on a failed command */
struct _ioctl_reply *ioctl_reply; /* data pointer, for returning error messages */
#if __FreeBSD__ >= 3
/* Why aren't these declared anywhere? XXX */
int setjmp(jmp_buf);
void longjmp(jmp_buf, int);
#endif
/* pointer to ioctl p parameter, to save passing it around */
extern struct proc *myproc;
/* Open the device associated with the drive, and set drive's vp */
int
open_drive(struct drive *drive, struct proc *p)
{
BROKEN_GDB;
struct nameidata nd;
struct vattr va;
int error;
if (drive->devicename[0] == '\0') /* no device name */
sprintf(drive->devicename, "/dev/%s", drive->label.name); /* get it from the drive name */
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, drive->devicename, p);
error = vn_open(&nd, FREAD | FWRITE, 0); /* open the device */
if (error != 0) { /* can't open? */
set_drive_state(drive->driveno, drive_down, 1);
drive->lasterror = error;
printf("vinum open_drive %s: failed with error %d\n", drive->devicename, error); /* XXX */
return error;
}
drive->vp = nd.ni_vp;
drive->p = p;
if (drive->vp->v_usecount > 1) { /* already in use? */
#if __FreeBSD__ == 2 /* pre-4.4BSD Lite/2 parameters */
VOP_UNLOCK(drive->vp);
#else
VOP_UNLOCK(drive->vp, 0, p);
#endif
close_drive(drive);
set_drive_state(drive->driveno, drive_down, 1);
drive->lasterror = EBUSY;
printf("vinum open_drive %s: Drive in use\n", drive->devicename); /* XXX */
return EBUSY;
}
error = VOP_GETATTR(drive->vp, &va, NOCRED, p);
if (error) {
#if __FreeBSD__ == 2 /* pre-4.4BSD Lite/2 parameters */
VOP_UNLOCK(drive->vp);
#else
VOP_UNLOCK(drive->vp, 0, p);
#endif
close_drive(drive);
set_drive_state(drive->driveno, drive_down, 1);
drive->lasterror = error;
printf("vinum open_drive %s: GETAATTR returns error %d\n", drive->devicename, error); /* XXX */
return error;
}
drive->dev = va.va_rdev; /* device */
if (va.va_type != VBLK) { /* only consider block devices */
#if __FreeBSD__ == 2 /* pre-4.4BSD Lite/2 parameters */
VOP_UNLOCK(drive->vp);
#else
VOP_UNLOCK(drive->vp, 0, p);
#endif
close_drive(drive);
set_drive_state(drive->driveno, drive_down, 1); /* this also closes the drive */
drive->lasterror = ENOTBLK;
printf("vinum open_drive %s: Not a block device\n", drive->devicename); /* XXX */
return ENOTBLK;
}
drive->vp->v_numoutput = 0;
#if __FreeBSD__ == 2 /* pre-4.4BSD Lite/2 parameters */
VOP_UNLOCK(drive->vp);
#else
VOP_UNLOCK(drive->vp, 0, p);
#endif
return 0;
}
/* Set some variables in the drive struct
* in more convenient form. Return error indication */
int
set_drive_parms(struct drive *drive)
{
drive->blocksize = BLKDEV_IOSIZE; /* XXX do we need this? */
drive->secsperblock = drive->blocksize /* number of sectors per block */
/ drive->partinfo.disklab->d_secsize;
/* Now update the label part */
bcopy(hostname, drive->label.sysname, VINUMHOSTNAMELEN); /* put in host name */
#if __FreeBSD__ >= 3
getmicrotime(&drive->label.date_of_birth); /* and current time */
#else
drive->label.date_of_birth = time; /* and current time */
#endif
drive->label.drive_size = ((u_int64_t) drive->partinfo.part->p_size) /* size of the drive in bytes */
*((u_int64_t) drive->partinfo.disklab->d_secsize);
/* number of sectors available for subdisks */
drive->sectors_available = drive->label.drive_size / DEV_BSIZE - DATASTART;
/* XXX Bug in 3.0 as of January 1998: you can open
* non-existent slices. They have a length of 0 */
if (drive->label.drive_size < MINVINUMSLICE) { /* too small to worry about */
set_drive_state(drive->driveno, drive_down, 1);
printf("vinum open_drive %s: Drive too small\n", drive->devicename); /* XXX */
drive->lasterror = ENOSPC;
return ENOSPC;
}
drive->freelist_size = INITIAL_DRIVE_FREELIST; /* initial number of entries */
drive->freelist = (struct drive_freelist *)
Malloc(INITIAL_DRIVE_FREELIST * sizeof(struct drive_freelist));
if (drive->freelist == NULL) /* can't malloc, dammit */
return ENOSPC;
drive->freelist_entries = 1; /* just (almost) the complete drive */
drive->freelist[0].offset = DATASTART; /* starts here */
drive->freelist[0].sectors = (drive->label.drive_size >> DEV_BSHIFT) - DATASTART; /* and it's this long */
set_drive_state(drive->driveno, drive_up, 1); /* our drive is accessible */
return 0;
}
/* Initialize a drive: open the device and add device
* information */
int
init_drive(struct drive *drive)
{
BROKEN_GDB;
int error;
if (drive->devicename[0] == '\0') { /* no device name yet, default to drive name */
drive->lasterror = EINVAL;
printf("vinum: Can't open drive without drive name\n"); /* XXX */
return EINVAL;
}
error = open_drive(drive, myproc); /* open the drive */
if (error)
return error;
error = VOP_IOCTL(drive->vp, /* get the partition information */
DIOCGPART,
(caddr_t) & drive->partinfo,
FREAD,
NOCRED,
myproc);
if (error) {
printf("vinum open_drive %s: Can't get partition information, error %d\n",
drive->devicename,
error); /* XXX */
close_drive(drive);
drive->lasterror = error;
set_drive_state(drive->driveno, drive_down, 1);
return error;
}
if (drive->partinfo.part->p_fstype != 0) { /* not plain */
drive->lasterror = EFTYPE;
printf("vinum open_drive %s: Wrong partition type for vinum\n", drive->devicename); /* XXX */
close_drive(drive);
set_drive_state(drive->driveno, drive_down, 1);
return EFTYPE;
}
return set_drive_parms(drive); /* set various odds and ends */
}
/* Close a drive if it's open. No errors */
void
close_drive(struct drive *drive)
{
if (drive->vp) {
vn_close(drive->vp, FREAD | FWRITE, NOCRED, drive->p);
drive->vp = NULL;
}
}
/* Remove drive from the configuration.
* Caller must ensure that it isn't active
*/
void
remove_drive(int driveno)
{
BROKEN_GDB;
struct drive *drive = &vinum_conf.drive[driveno];
long long int nomagic = VINUM_NOMAGIC; /* no magic number */
write_drive(drive, /* obliterate the magic, but leave a hint */
(char *) &nomagic,
8,
VINUM_LABEL_OFFSET);
close_drive(drive); /* and close it */
drive->state = drive_unallocated; /* and forget everything we knew about it */
save_config(); /* and save the updated configuration */
}
/* Transfer drive data. Usually called from one of these defines;
* #define read_drive(a, b, c, d) driveio (a, b, c, d, B_READ)
* #define write_drive(a, b, c, d) driveio (a, b, c, d, B_WRITE)
*
* Return error number
*/
int
driveio(struct drive *drive, void *buf, size_t length, off_t offset, int flag)
{
BROKEN_GDB;
int error;
struct buf *bp;
int spl;
error = 0;
/* Get a buffer */
bp = (struct buf *) Malloc(sizeof(struct buf)); /* get a buffer */
CHECKALLOC(bp, "Can't allocate memory");
bzero(&buf, sizeof(buf));
bp->b_flags = B_BUSY | flag; /* tell us when it's done */
bp->b_iodone = drive_io_done; /* here */
bp->b_proc = myproc; /* process */
bp->b_dev = drive->vp->v_un.vu_specinfo->si_rdev; /* device */
if (offset & (drive->partinfo.disklab->d_secsize - 1)) /* not on a block boundary */
bp->b_blkno = offset / drive->partinfo.disklab->d_secsize; /* block number */
bp->b_data = buf;
bp->b_vp = drive->vp; /* vnode */
bp->b_bcount = length;
bp->b_bufsize = length;
(*bdevsw[major(bp->b_dev)]->d_strategy) (bp); /* initiate the transfer */
spl = splbio();
while ((bp->b_flags & B_DONE) == 0) {
bp->b_flags |= B_CALL; /* wake me again */
tsleep((caddr_t) bp, PRIBIO, "driveio", 0); /* and wait for it to complete */
}
splx(spl);
if (bp->b_flags & B_ERROR) /* didn't work */
error = bp->b_error; /* get the error return */
Free(bp); /* then return the buffer */
return error;
}
/* Read data from a drive
* Return error number
*/
int
read_drive(struct drive *drive, void *buf, size_t length, off_t offset)
{
BROKEN_GDB;
int error;
struct buf *bp;
daddr_t nextbn;
long bscale;
struct uio uio;
struct iovec iov;
daddr_t blocknum; /* block number */
int blockoff; /* offset in block */
int count; /* amount to transfer */
iov.iov_base = buf;
iov.iov_len = length;
uio.uio_iov = &iov;
uio.uio_iovcnt = length;
uio.uio_offset = offset;
uio.uio_resid = length;
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_READ;
uio.uio_procp = myproc;
bscale = btodb(drive->blocksize); /* mask off offset from block number */
do {
blocknum = btodb(uio.uio_offset) & ~(bscale - 1); /* get the block number */
blockoff = uio.uio_offset % drive->blocksize; /* offset in block */
count = min((unsigned) (drive->blocksize - blockoff), /* amount to transfer in this block */
uio.uio_resid);
/* XXX Check this. I think the test is wrong */
if (drive->vp->v_lastr + bscale == blocknum) { /* did our last read finish in this block? */
nextbn = blocknum + bscale; /* note the end of the transfer */
error = breadn(drive->vp, /* and read with read-ahead */
blocknum,
(int) drive->blocksize,
&nextbn,
(int *) &drive->blocksize,
1,
NOCRED,
&bp);
} else /* random read: just read this block */
error = bread(drive->vp, blocknum, (int) drive->blocksize, NOCRED, &bp);
drive->vp->v_lastr = blocknum; /* note the last block we read */
count = min(count, drive->blocksize - bp->b_resid);
if (error) {
brelse(bp);
return error;
}
error = uiomove((char *) bp->b_data + blockoff, count, &uio); /* move the data */
brelse(bp);
}
while (error == 0 && uio.uio_resid > 0 && count != 0);
return error;
}
/* Write data to a drive
* Return error number
*/
int
write_drive(struct drive *drive, void *buf, size_t length, off_t offset)
{
BROKEN_GDB;
int error;
struct buf *bp;
struct uio uio;
struct iovec iov;
daddr_t blocknum; /* block number */
int blockoff; /* offset in block */
int count; /* amount to transfer */
int blockshift;
if (drive->state == drive_down) /* currently down */
return 0; /* ignore */
if (drive->vp == NULL) {
drive->lasterror = ENODEV;
return ENODEV; /* not configured yet */
}
iov.iov_base = buf;
iov.iov_len = length;
uio.uio_iov = &iov;
uio.uio_iovcnt = length;
uio.uio_offset = offset;
uio.uio_resid = length;
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_WRITE;
uio.uio_procp = myproc;
error = 0;
blockshift = btodb(drive->blocksize) - 1; /* amount to shift block number
* to get sector number */
do {
blocknum = btodb(uio.uio_offset) & ~blockshift; /* get the block number */
blockoff = uio.uio_offset % drive->blocksize; /* offset in block */
count = min((unsigned) (drive->blocksize - blockoff), /* amount to transfer in this block */
uio.uio_resid);
if (count == drive->blocksize) /* the whole block */
bp = getblk(drive->vp, blocknum, drive->blocksize, 0, 0); /* just get it */
else /* partial block: */
error = bread(drive->vp, /* read it first */
blocknum,
drive->blocksize,
NOCRED,
&bp);
count = min(count, drive->blocksize - bp->b_resid); /* how much will we transfer now? */
if (error == 0)
error = uiomove((char *) bp->b_data + blockoff, /* move the data to the block */
count,
&uio);
if (error) {
brelse(bp);
drive->lasterror = error;
switch (error) {
case EIO:
set_drive_state(drive->driveno, drive_down, 1);
break;
/* XXX Add other possibilities here */
default:
}
return error;
}
if (count + blockoff == drive->blocksize)
/* The transfer goes to the end of the block. There's
* no need to wait for any more data to arrive. */
bawrite(bp); /* start the write now */
else
bdwrite(bp); /* do a delayed write */
}
while (error == 0 && uio.uio_resid > 0 && count != 0);
if (error)
drive->lasterror = error;
return error; /* OK */
}
/* Wake up on completion */
void
drive_io_done(struct buf *bp)
{
BROKEN_GDB;
wakeup((caddr_t) bp); /* Wachet auf! */
bp->b_flags &= ~B_CALL; /* don't do this again */
}
/* Check a drive for a vinum header. If found,
* update the drive information. We come here
* with a partially populated drive structure
* which includes the device name.
*
* Return information on what we found
*/
enum drive_label_info
read_drive_label(struct drive *drive)
{
BROKEN_GDB;
int error;
int result; /* result of our search */
struct vinum_hdr *vhdr; /* and as header */
error = init_drive(drive); /* find the drive */
if (error) /* find the drive */
return DL_CANT_OPEN; /* not ours */
vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN); /* allocate buffers */
CHECKALLOC(vhdr, "Can't allocate memory");
error = read_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
if (vhdr->magic == VINUM_MAGIC) { /* ours! */
if (drive->label.name[0] /* we have a name for this drive */
&&(strcmp(drive->label.name, vhdr->label.name))) { /* but it doesn't match the real name */
drive->lasterror = EINVAL;
result = DL_WRONG_DRIVE; /* it's the wrong drive */
} else {
set_drive_parms(drive); /* and set other parameters */
result = DL_OURS;
}
/* We copy the drive anyway so that we have
* the correct name in the drive info. This
* may not be the name specified */
drive->label = vhdr->label; /* put in the label information */
} else if (vhdr->magic == VINUM_NOMAGIC) /* was ours, but we gave it away */
result = DL_DELETED_LABEL;
else
result = DL_NOT_OURS; /* we could have it, but we don't yet */
Free(vhdr); /* that's all. */
return result;
}
/* Check a drive for a vinum header. If found,
* read configuration information from the drive and
* incorporate the data into the configuration.
*
* Return error number
*/
int
check_drive(char *drivename)
{
BROKEN_GDB;
int error;
struct nameidata nd; /* mount point credentials */
char *config_text; /* read the config info from disk into here */
volatile char *cptr; /* pointer into config information */
char *eptr; /* end pointer into config information */
int driveno;
struct drive *drive;
char *config_line; /* copy the config line to */
driveno = find_drive_by_dev(drivename, 1); /* doesn't exist, create it */
drive = &vinum_conf.drive[driveno]; /* and get a pointer */
strcpy(drive->devicename, drivename); /* put in device name */
if (read_drive_label(drive) == DL_OURS) { /* ours! */
config_text = (char *) Malloc(MAXCONFIG * 2); /* allocate buffers */
CHECKALLOC(config_text, "Can't allocate memory");
config_line = (char *) Malloc(MAXCONFIGLINE * 2); /* allocate buffers */
CHECKALLOC(config_line, "Can't allocate memory");
/* Read in both copies of the configuration information */
error = read_drive(drive, config_text, MAXCONFIG * 2, VINUM_CONFIG_OFFSET);
if (error != 0) {
printf("vinum: Can't read device %s, error %d\n", drive->devicename, error);
Free(config_text);
Free(config_line);
free_drive(drive); /* give it back */
return error;
}
/* XXX At this point, check that the two copies are the same, and do something useful if not.
* In particular, consider which is newer, and what this means for the integrity of the
* data on the drive */
/* Parse the configuration, and add it to the global configuration */
for (cptr = config_text; *cptr != '\0';) { /* love this style(9) */
volatile int parse_status; /* return value from parse_config */
for (eptr = config_line; (*cptr != '\n') && (*cptr != '\0');) /* until the end of the line */
*eptr++ = *cptr++;
*eptr = '\0'; /* and delimit */
if (setjmp(command_fail) == 0) { /* come back here on error and continue */
parse_status = parse_config(config_line, &keyword_set); /* parse the config line */
if (parse_status < 0) { /* error in config */
/* This config should have been parsed in user
* space. If we run into problems here, something
* serious is afoot. Complain and let the user
* snarf the config to see what's wrong */
printf("vinum: Config error on drive %s, aborting integration\n", nd.ni_dirp);
Free(config_text);
Free(config_line);
free_drive(drive); /* give it back */
return EINVAL;
}
}
while (*cptr == '\n')
cptr++; /* skip to next line */
}
Free(config_text);
if ((vinum_conf.flags & VF_READING_CONFIG) == 0) /* not reading config */
updateconfig(0); /* update object states */
printf("vinum: read configuration from %s\n", drivename);
return 0; /* it all worked */
} else { /* no vinum label found */
if (drive->lasterror) {
set_drive_state(drive->driveno, drive_down, 1);
return drive->lasterror;
} else
return ENODEV; /* not our device */
}
}
/* Kludge: kernel printf doesn't handle longs correctly XXX */
static char *lltoa(long long l, char *s);
static char *sappend(char *txt, char *s);
static char *
lltoa(long long l, char *s)
{
if (l < 0) {
*s++ = '-';
l = -l;
}
if (l > 9) {
s = lltoa(l / 10, s);
l %= 10;
}
*s++ = l + '0';
return s;
}
static char *
sappend(char *txt, char *s)
{
while (*s++ = *txt++);
return s - 1;
}
/* Format the configuration in text form into the buffer
* at config. Don't go beyond len bytes
* XXX this stinks. Fix soon. */
void
format_config(char *config, int len)
{
BROKEN_GDB;
int i;
int j;
char *s = config;
bzero(config, len);
/* First write the drive configuration */
for (i = 0; i < vinum_conf.drives_used; i++) {
struct drive *drive;
drive = &vinum_conf.drive[i];
if (drive->state != drive_unallocated) {
sprintf(s,
"drive %s state %s device %s\n",
drive->label.name,
drive_state(drive->state),
drive->devicename);
while (*s)
s++; /* find the end */
if (s > &config[len - 80]) {
printf("vinum: configuration data overflow\n");
return;
}
}
}
/* Then the volume configuration */
for (i = 0; i < vinum_conf.volumes_used; i++) {
struct volume *vol;
vol = &vinum_conf.volume[i];
if (vol->state != volume_unallocated) {
if (vol->preferred_plex >= 0) /* preferences, */
sprintf(s,
"volume %s state %s readpol prefer %s",
vol->name,
volume_state(vol->state),
vinum_conf.plex[vol->preferred_plex].name);
else /* default round-robin */
sprintf(s,
"volume %s state %s",
vol->name,
volume_state(vol->state));
while (*s)
s++; /* find the end */
s = sappend("\n", s);
if (s > &config[len - 80]) {
printf("vinum: configuration data overflow\n");
return;
}
}
}
/* Then the plex configuration */
for (i = 0; i < vinum_conf.plexes_used; i++) {
struct plex *plex;
plex = &vinum_conf.plex[i];
if (plex->state != plex_unallocated) {
sprintf(s, "plex name %s state %s org %s ",
plex->name,
plex_state(plex->state),
plex_org(plex->organization));
while (*s)
s++; /* find the end */
if ((plex->organization == plex_striped)
) {
sprintf(s, "%db ", (int) plex->stripesize);
while (*s)
s++; /* find the end */
}
if (plex->volno >= 0) /* we have a volume */
sprintf(s, "vol %s ", vinum_conf.volume[plex->volno].name);
while (*s)
s++; /* find the end */
for (j = 0; j < plex->subdisks; j++) {
sprintf(s, " sd %s", vinum_conf.sd[plex->sdnos[j]].name);
}
s = sappend("\n", s);
if (s > &config[len - 80]) {
printf("vinum: configuration data overflow\n");
return;
}
}
}
/* And finally the subdisk configuration */
for (i = 0; i < vinum_conf.subdisks_used; i++) {
struct sd *sd = &vinum_conf.sd[i]; /* XXX */
if (vinum_conf.sd[i].state != sd_unallocated) {
sprintf(s,
"sd name %s drive %s plex %s state %s len ",
sd->name,
vinum_conf.drive[sd->driveno].label.name,
vinum_conf.plex[sd->plexno].name,
sd_state(sd->state));
while (*s)
s++; /* find the end */
s = lltoa(sd->sectors, s);
s = sappend("b driveoffset ", s);
s = lltoa(sd->driveoffset, s);
s = sappend("b plexoffset ", s);
s = lltoa(sd->plexoffset, s);
s = sappend("b\n", s);
if (s > &config[len - 80]) {
printf("vinum: configuration data overflow\n");
return;
}
}
}
}
/* Write the configuration to all vinum slices */
int
save_config(void)
{
BROKEN_GDB;
int error;
int written_config; /* set when we firstnwrite the config to disk */
int driveno;
struct drive *drive; /* point to current drive info */
struct vinum_hdr *vhdr; /* and as header */
char *config; /* point to config data */
int wlabel_on; /* to set writing label on/off */
/* don't save the configuration while we're still working on it */
if (vinum_conf.flags & VF_CONFIGURING)
return 0;
written_config = 0; /* no config written yet */
/* Build a volume header */
vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN); /* get space for the config data */
CHECKALLOC(vhdr, "Can't allocate config data");
vhdr->magic = VINUM_MAGIC; /* magic number */
vhdr->config_length = MAXCONFIG; /* length of following config info */
config = Malloc(MAXCONFIG); /* get space for the config data */
CHECKALLOC(config, "Can't allocate config data");
format_config(config, MAXCONFIG);
error = 0; /* no errors yet */
for (driveno = 0; driveno < vinum_conf.drives_used; driveno++) {
drive = &vinum_conf.drive[driveno]; /* point to drive */
if (drive->state != drive_down) {
#if (__FreeBSD__ >= 3)
getmicrotime(&drive->label.last_update); /* time of last update is now */
#else
drive->label.last_update = time; /* time of last update is now */
#endif
bcopy((char *) &drive->label, /* and the label info from the drive structure */
(char *) &vhdr->label,
sizeof(vhdr->label));
if ((drive->state != drive_unallocated)
&& (drive->state != drive_uninit)) {
wlabel_on = 1; /* enable writing the label */
error = VOP_IOCTL(drive->vp, /* make the label writeable */
DIOCWLABEL,
(caddr_t) & wlabel_on,
FWRITE,
NOCRED,
myproc);
if (error == 0)
error = write_drive(drive, vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
if (error == 0)
error = write_drive(drive, config, MAXCONFIG, VINUM_CONFIG_OFFSET);
wlabel_on = 0; /* enable writing the label */
VOP_IOCTL(drive->vp, /* make the label non-writeable again */
DIOCWLABEL,
(caddr_t) & wlabel_on,
FWRITE,
NOCRED,
myproc);
if (error) {
printf("vinum: Can't write config to %s, error %d\n", drive->devicename, error);
set_drive_state(drive->driveno, drive_down, 1);
} else
written_config = 1; /* we've written it on at least one drive */
}
}
}
Free(vhdr);
Free(config);
return written_config == 0; /* return 1 if we failed to write config */
}
/* Disk labels are a mess. The correct way to access them
* is with the DIOC[GSW]DINFO ioctls, but some programs, such
* as newfs, access the disk directly, so we have to write
* things there. We do this only on request. If a user
* request tries to read it directly, we fake up one on the fly.
*/
/* get_volume_label returns a label structure to lp, which
* is allocated by the caller */
void
get_volume_label(struct volume *vol, struct disklabel *lp)
{
bzero(lp, sizeof(struct disklabel));
strncpy(lp->d_typename, "vinum", sizeof(lp->d_typename));
lp->d_type = DTYPE_VINUM;
strncpy(lp->d_packname, vol->name, min(sizeof(lp->d_packname), sizeof(vol->name)));
lp->d_rpm = 14400 * vol->plexes; /* to keep them guessing */
lp->d_interleave = 1;
lp->d_flags = 0;
/* Fitting unto the vine, a vinum has a single
* track with all its sectors */
lp->d_secsize = DEV_BSIZE; /* bytes per sector */
lp->d_nsectors = vol->size; /* data sectors per track */
lp->d_ntracks = 1; /* tracks per cylinder */
lp->d_ncylinders = 1; /* data cylinders per unit */
lp->d_secpercyl = vol->size; /* data sectors per cylinder */
lp->d_secperunit = vol->size; /* data sectors per unit */
lp->d_bbsize = BBSIZE;
lp->d_sbsize = SBSIZE;
lp->d_magic = DISKMAGIC;
lp->d_magic2 = DISKMAGIC;
/* Set up partitions a, b and c to be identical
* and the size of the volume. a is UFS, b is
* swap, c is nothing */
lp->d_partitions[0].p_size = vol->size;
lp->d_partitions[0].p_fsize = 1024;
lp->d_partitions[0].p_fstype = FS_BSDFFS; /* FreeBSD File System :-) */
lp->d_partitions[0].p_fsize = 1024; /* FS fragment size */
lp->d_partitions[0].p_frag = 8; /* and fragments per block */
lp->d_partitions[SWAP_PART].p_size = vol->size;
lp->d_partitions[SWAP_PART].p_fstype = FS_SWAP; /* swap partition */
lp->d_partitions[LABEL_PART].p_size = vol->size;
lp->d_npartitions = LABEL_PART + 1;
strncpy(lp->d_packname, vol->name, min(sizeof(lp->d_packname), sizeof(vol->name)));
lp->d_checksum = dkcksum(lp);
}
int
write_volume_label(int volno)
{
struct disklabel *lp;
struct buf *bp;
struct disklabel *dlp;
struct volume *vol;
int error;
lp = (struct disklabel *) Malloc((sizeof(struct disklabel) + (DEV_BSIZE - 1)) & (DEV_BSIZE - 1));
if (lp == 0)
return ENOMEM;
if ((unsigned) (volno) >= (unsigned) vinum_conf.volumes_used) /* invalid volume */
return ENOENT;
vol = &VOL[volno]; /* volume in question */
if (vol->state == volume_unallocated) /* nothing there */
return ENOENT;
get_volume_label(vol, lp); /* get the label */
/* Now write to disk. This code is derived from the
* system writedisklabel (), which does silly things
* like reading the label and refusing to write
* unless it's already there. */
bp = geteblk((int) lp->d_secsize); /* get a buffer */
bp->b_dev = minor(vol->devno) | (CDEV_MAJOR << MAJORDEV_SHIFT); /* our own raw volume */
bp->b_blkno = LABELSECTOR * ((int) lp->d_secsize / DEV_BSIZE);
bp->b_bcount = lp->d_secsize;
bzero(bp->b_data, lp->d_secsize);
dlp = (struct disklabel *) bp->b_data;
*dlp = *lp;
bp->b_flags &= ~B_INVAL;
bp->b_flags |= B_BUSY | B_WRITE;
vinumstrategy(bp); /* write it out */
error = biowait(bp);
bp->b_flags |= B_INVAL | B_AGE;
brelse(bp);
return error;
}
/* Initialize a subdisk */
int
initsd(int sdno)
{
return 0;
}
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