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freebsd-nq/sys/dev/vinum/vinumio.c
Greg Lehey 9cd8b5cf0d Correct check for partition c. Previously the check was for drive 2, 
which did not exactly have the desired result.

Submitted by:	Akira Watanabe <akira@myaw.ei.meisei-u.ac.jp>
2001-01-20 03:46:19 +00:00

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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: vinumio.c,v 1.30 2000/05/10 23:23:30 grog Exp grog $
* $FreeBSD$
*/
#include <dev/vinum/vinumhdr.h>
#include <dev/vinum/request.h>
#include <vm/vm_zone.h>
static char *sappend(char *txt, char *s);
static int drivecmp(const void *va, const void *vb);
/*
* Open the device associated with the drive, and set drive's vp.
* Return an error number
*/
int
open_drive(struct drive *drive, struct proc *p, int verbose)
{
int devmajor; /* major devs for disk device */
int devminor; /* minor devs for disk device */
int unit;
char *dname;
struct cdevsw *dsw; /* pointer to cdevsw entry */
if (bcmp(drive->devicename, "/dev/", 5)) /* device name doesn't start with /dev */
return ENOENT; /* give up */
if (drive->flags & VF_OPEN) /* open already, */
return EBUSY; /* don't do it again */
/*
* Yes, Bruce, I know this is horrible, but we
* don't have a root file system when we first
* try to do this. If you can come up with a
* better solution, I'd really like it. I'm
* just putting it in now to add ammuntion to
* moving the system to devfs.
*/
dname = &drive->devicename[5];
drive->dev = NULL; /* no device yet */
/* Find the device */
if (bcmp(dname, "ad", 2) == 0) /* IDE disk */
devmajor = 116;
else if (bcmp(dname, "wd", 2) == 0) /* IDE disk */
devmajor = 3;
else if (bcmp(dname, "da", 2) == 0)
devmajor = 13;
else if (bcmp(dname, "vn", 2) == 0)
devmajor = 43;
else if (bcmp(dname, "md", 2) == 0)
devmajor = 95;
else if (bcmp(dname, "amrd", 4) == 0) {
devmajor = 133;
dname += 2;
} else if (bcmp(dname, "idad", 4) == 0) {
devmajor = 109;
dname += 2;
} else
return ENODEV;
dname += 2; /* point past */
/*
* Found the device. We can expect one of
* two formats for the rest: a unit number,
* then either a partition letter for the
* compatiblity partition (e.g. h) or a
* slice ID and partition (e.g. s2e).
* Create a minor number for each of them.
*/
unit = 0;
while ((*dname >= '0') /* unit number */
&&(*dname <= '9')) {
unit = unit * 10 + *dname - '0';
dname++;
}
if (*dname == 's') { /* slice */
if (((dname[1] < '1') || (dname[1] > '4')) /* invalid slice */
||((dname[2] < 'a') || (dname[2] > 'h'))) /* or invalid partition */
return ENODEV;
devminor = ((unit & 31) << 3) /* unit */
+(dname[2] - 'a') /* partition */
+((dname[1] - '0' + 1) << 16) /* slice */
+((unit & ~31) << 16); /* high-order unit bits */
} else { /* compatibility partition */
if ((*dname < 'a') || (*dname > 'h')) /* or invalid partition */
return ENODEV;
devminor = (*dname - 'a') /* partition */
+((unit & 31) << 3) /* unit */
+((unit & ~31) << 16); /* high-order unit bits */
}
if ((devminor & 7) == 2) /* partition c */
return ENOTTY; /* not buying that */
drive->dev = makedev(devmajor, devminor); /* find the device */
if (drive->dev == NULL) /* didn't find anything */
return ENODEV;
drive->dev->si_iosize_max = DFLTPHYS;
dsw = devsw(drive->dev);
if (dsw == NULL)
drive->lasterror = ENOENT;
else
drive->lasterror = (dsw->d_open) (drive->dev, FWRITE, 0, NULL);
if (drive->lasterror != 0) { /* failed */
drive->state = drive_down; /* just force it down */
if (verbose)
log(LOG_WARNING,
"vinum open_drive %s: failed with error %d\n",
drive->devicename, drive->lasterror);
} else
drive->flags |= VF_OPEN; /* we're open now */
return drive->lasterror;
}
/*
* 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; /* 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 */
getmicrotime(&drive->label.date_of_birth); /* and current time */
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);
#if VINUMDEBUG
if (debug & DEBUG_BIGDRIVE) /* pretend we're 100 times as big */
drive->label.drive_size *= 100;
#endif
/* number of sectors available for subdisks */
drive->sectors_available = drive->label.drive_size / DEV_BSIZE - DATASTART;
/*
* 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, setstate_force);
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 */
if (drive->label.name[0] != '\0') /* got a name */
set_drive_state(drive->driveno, drive_up, setstate_force); /* our drive is accessible */
else /* we know about it, but that's all */
drive->state = drive_referenced;
return 0;
}
/*
* Initialize a drive: open the device and add device
* information
*/
int
init_drive(struct drive *drive, int verbose)
{
if (drive->devicename[0] != '/') {
drive->lasterror = EINVAL;
log(LOG_ERR, "vinum: Can't open drive without drive name\n");
return EINVAL;
}
drive->lasterror = open_drive(drive, curproc, verbose); /* open the drive */
if (drive->lasterror)
return drive->lasterror;
drive->lasterror = (*devsw(drive->dev)->d_ioctl) (drive->dev,
DIOCGPART,
(caddr_t) & drive->partinfo,
FREAD,
curproc);
if (drive->lasterror) {
if (verbose)
log(LOG_WARNING,
"vinum open_drive %s: Can't get partition information, drive->lasterror %d\n",
drive->devicename,
drive->lasterror);
close_drive(drive);
return drive->lasterror;
}
if (drive->partinfo.part->p_fstype != FS_VINUM) { /* not Vinum */
drive->lasterror = EFTYPE;
if (verbose)
log(LOG_WARNING,
"vinum open_drive %s: Wrong partition type for vinum\n",
drive->devicename);
close_drive(drive);
return EFTYPE;
}
return set_drive_parms(drive); /* set various odds and ends */
}
/* Close a drive if it's open. */
void
close_drive(struct drive *drive)
{
LOCKDRIVE(drive); /* keep the daemon out */
if (drive->flags & VF_OPEN)
close_locked_drive(drive); /* and close it */
if (drive->state > drive_down) /* if it's up */
drive->state = drive_down; /* make sure it's down */
unlockdrive(drive);
}
/*
* Real drive close code, called with drive already locked.
* We have also checked that the drive is open. No errors.
*/
void
close_locked_drive(struct drive *drive)
{
/*
* If we can't access the drive, we can't flush
* the queues, which spec_close() will try to
* do. Get rid of them here first.
*/
drive->lasterror = (*devsw(drive->dev)->d_close) (drive->dev, 0, 0, NULL);
drive->flags &= ~VF_OPEN; /* no longer open */
}
/*
* Remove drive from the configuration.
* Caller must ensure that it isn't active.
*/
void
remove_drive(int driveno)
{
struct drive *drive = &vinum_conf.drive[driveno];
struct vinum_hdr *vhdr; /* buffer for header */
int error;
if (drive->state > drive_referenced) { /* real drive */
if (drive->state == drive_up) {
vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN); /* allocate buffer */
CHECKALLOC(vhdr, "Can't allocate memory");
error = read_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
if (error)
drive->lasterror = error;
else {
vhdr->magic = VINUM_NOMAGIC; /* obliterate the magic, but leave the rest */
write_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
}
Free(vhdr);
}
free_drive(drive); /* close it and free resources */
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)
*
* length and offset are in bytes, but must be multiples of sector
* size. The function *does not check* for this condition, and
* truncates ruthlessly.
* Return error number
*/
int
driveio(struct drive *drive, char *buf, size_t length, off_t offset, int flag)
{
int error;
struct buf *bp;
error = 0; /* to keep the compiler happy */
while (length) { /* divide into small enough blocks */
int len = min(length, MAXBSIZE); /* maximum block device transfer is MAXBSIZE */
bp = geteblk(len); /* get a buffer header */
bp->b_flags = 0;
bp->b_iocmd = flag;
bp->b_dev = drive->dev; /* device */
bp->b_blkno = offset / drive->partinfo.disklab->d_secsize; /* block number */
bp->b_saveaddr = bp->b_data;
bp->b_data = buf;
bp->b_bcount = len;
DEV_STRATEGY(bp, 0); /* initiate the transfer */
error = bufwait(bp);
bp->b_data = bp->b_saveaddr;
bp->b_flags |= B_INVAL | B_AGE;
bp->b_ioflags &= ~BIO_ERROR;
brelse(bp);
if (error)
break;
length -= len; /* update pointers */
buf += len;
offset += len;
}
return error;
}
/*
* 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.
*
* This function is called from two places: check_drive,
* which wants to find out whether the drive is a
* Vinum drive, and config_drive, which asserts that
* it is a vinum drive. In the first case, we don't
* print error messages (verbose==0), in the second
* we do (verbose==1).
*/
enum drive_label_info
read_drive_label(struct drive *drive, int verbose)
{
int error;
int result; /* result of our search */
struct vinum_hdr *vhdr; /* and as header */
error = init_drive(drive, 0); /* 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");
drive->state = drive_up; /* be optimistic */
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 */
drive->state = drive_unallocated; /* put it back, it's not ours */
} else
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; /* and return the info */
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 drive number.
*/
struct drive *
check_drive(char *devicename)
{
int driveno;
int i;
struct drive *drive;
driveno = find_drive_by_dev(devicename, 1); /* if entry doesn't exist, create it */
drive = &vinum_conf.drive[driveno]; /* and get a pointer */
if (read_drive_label(drive, 0) == DL_OURS) { /* one of ours */
for (i = 0; i < vinum_conf.drives_allocated; i++) { /* see if the name already exists */
if ((i != driveno) /* not this drive */
&&(DRIVE[i].state != drive_unallocated) /* and it's allocated */
&&(strcmp(DRIVE[i].label.name,
DRIVE[driveno].label.name) == 0)) { /* and it has the same name */
struct drive *mydrive = &DRIVE[i];
if (mydrive->devicename[0] == '/') { /* we know a device name for it */
/*
* set an error, but don't take the
* drive down: that would cause unneeded
* error messages.
*/
drive->lasterror = EEXIST;
break;
} else { /* it's just a place holder, */
int sdno;
for (sdno = 0; sdno < vinum_conf.subdisks_allocated; sdno++) { /* look at each subdisk */
if ((SD[sdno].driveno == i) /* it's pointing to this one, */
&&(SD[sdno].state != sd_unallocated)) { /* and it's a real subdisk */
SD[sdno].driveno = drive->driveno; /* point to the one we found */
update_sd_state(sdno); /* and update its state */
}
}
bzero(mydrive, sizeof(struct drive)); /* don't deallocate it, just remove it */
}
}
}
} else {
if (drive->lasterror == 0)
drive->lasterror = ENODEV;
close_drive(drive);
drive->state = drive_down;
}
return drive;
}
static char *
sappend(char *txt, char *s)
{
while ((*s++ = *txt++) != 0);
return s - 1;
}
void
format_config(char *config, int len)
{
int i;
int j;
char *s = config;
char *configend = &config[len];
bzero(config, len);
/* First write the volume configuration */
for (i = 0; i < vinum_conf.volumes_allocated; i++) {
struct volume *vol;
vol = &vinum_conf.volume[i];
if ((vol->state > volume_uninit)
&& (vol->name[0] != '\0')) { /* paranoia */
snprintf(s,
configend - s,
"volume %s state %s",
vol->name,
volume_state(vol->state));
while (*s)
s++; /* find the end */
if (vol->preferred_plex >= 0) /* preferences, */
snprintf(s,
configend - s,
" readpol prefer %s",
vinum_conf.plex[vol->preferred_plex].name);
while (*s)
s++; /* find the end */
s = sappend("\n", s);
}
}
/* Then the plex configuration */
for (i = 0; i < vinum_conf.plexes_allocated; i++) {
struct plex *plex;
plex = &vinum_conf.plex[i];
if ((plex->state > plex_referenced)
&& (plex->name[0] != '\0')) { /* paranoia */
snprintf(s,
configend - 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 (isstriped(plex)) {
snprintf(s,
configend - s,
"%ds ",
(int) plex->stripesize);
while (*s)
s++; /* find the end */
}
if (plex->volno >= 0) /* we have a volume */
snprintf(s,
configend - s,
"vol %s ",
vinum_conf.volume[plex->volno].name);
while (*s)
s++; /* find the end */
for (j = 0; j < plex->subdisks; j++) {
snprintf(s,
configend - s,
" sd %s",
vinum_conf.sd[plex->sdnos[j]].name);
}
s = sappend("\n", s);
}
}
/* And finally the subdisk configuration */
for (i = 0; i < vinum_conf.subdisks_allocated; i++) {
struct sd *sd;
char *drivename;
sd = &SD[i];
if ((sd->state != sd_referenced)
&& (sd->state != sd_unallocated)
&& (sd->name[0] != '\0')) { /* paranoia */
drivename = vinum_conf.drive[sd->driveno].label.name;
/*
* XXX We've seen cases of dead subdisks
* which don't have a drive. If we let them
* through here, the drive name is null, so
* they get the drive named 'plex'.
*
* This is a breakage limiter, not a fix.
*/
if (drivename[0] == '\0')
drivename = "*invalid*";
if (sd->plexno >= 0)
snprintf(s,
configend - s,
"sd name %s drive %s plex %s state %s "
"len %llus driveoffset %llus plexoffset %llds\n",
sd->name,
drivename,
vinum_conf.plex[sd->plexno].name,
sd_state(sd->state),
(unsigned long long) sd->sectors,
(unsigned long long) sd->driveoffset,
(long long) sd->plexoffset);
else
snprintf(s,
configend - s,
"sd name %s drive %s state %s "
"len %llus driveoffset %llus detached\n",
sd->name,
drivename,
sd_state(sd->state),
(unsigned long long) sd->sectors,
(unsigned long long) sd->driveoffset);
while (*s)
s++; /* find the end */
}
}
if (s > &config[len - 2])
panic("vinum: configuration data overflow");
}
/*
* issue a save config request to the d<>mon. The actual work
* is done in process context by daemon_save_config
*/
void
save_config(void)
{
queue_daemon_request(daemonrq_saveconfig, (union daemoninfo) NULL);
}
/*
* Write the configuration to all vinum slices. This
* is performed by the d<>mon only
*/
void
daemon_save_config(void)
{
int error;
int written_config; /* set when we first write 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;
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_allocated; driveno++) {
drive = &vinum_conf.drive[driveno]; /* point to drive */
if (drive->state > drive_referenced) {
LOCKDRIVE(drive); /* don't let it change */
/*
* First, do some drive consistency checks. Some
* of these are kludges, others require a process
* context and couldn't be done before
*/
if ((drive->devicename[0] == '\0')
|| (drive->label.name[0] == '\0')) {
unlockdrive(drive);
free_drive(drive); /* get rid of it */
break;
}
if (((drive->flags & VF_OPEN) == 0) /* drive not open */
&&(drive->state > drive_down)) { /* and it thinks it's not down */
unlockdrive(drive);
set_drive_state(driveno, drive_down, setstate_force); /* tell it what's what */
continue;
}
if ((drive->state == drive_down) /* it's down */
&&(drive->flags & VF_OPEN)) { /* but open, */
unlockdrive(drive);
close_drive(drive); /* close it */
} else if (drive->state > drive_down) {
getmicrotime(&drive->label.last_update); /* time of last update is now */
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_referenced)) { /* and it's a real drive */
wlabel_on = 1; /* enable writing the label */
error = (*devsw(drive->dev)->d_ioctl) (drive->dev, /* make the label writeable */
DIOCWLABEL,
(caddr_t) & wlabel_on,
FWRITE,
curproc);
if (error == 0)
error = write_drive(drive, (char *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
if (error == 0)
error = write_drive(drive, config, MAXCONFIG, VINUM_CONFIG_OFFSET); /* first config copy */
if (error == 0)
error = write_drive(drive, config, MAXCONFIG, VINUM_CONFIG_OFFSET + MAXCONFIG); /* second copy */
wlabel_on = 0; /* enable writing the label */
if (error == 0)
error = (*devsw(drive->dev)->d_ioctl) (drive->dev, /* make the label non-writeable again */
DIOCWLABEL,
(caddr_t) & wlabel_on,
FWRITE,
curproc);
unlockdrive(drive);
if (error) {
log(LOG_ERR,
"vinum: Can't write config to %s, error %d\n",
drive->devicename,
error);
set_drive_state(drive->driveno, drive_down, setstate_force);
} else
written_config = 1; /* we've written it on at least one drive */
}
} else /* not worth looking at, */
unlockdrive(drive); /* just unlock it again */
}
}
Free(vhdr);
Free(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(char *name, int plexes, u_int64_t size, 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, name, min(sizeof(lp->d_packname), sizeof(name)));
lp->d_rpm = 14400 * plexes; /* to keep them guessing */
lp->d_interleave = 1;
lp->d_flags = 0;
/*
* A Vinum volume has a single track with all
* its sectors.
*/
lp->d_secsize = DEV_BSIZE; /* bytes per sector */
lp->d_nsectors = size; /* data sectors per track */
lp->d_ntracks = 1; /* tracks per cylinder */
lp->d_ncylinders = 1; /* data cylinders per unit */
lp->d_secpercyl = size; /* data sectors per cylinder */
lp->d_secperunit = 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 = 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 = size;
lp->d_partitions[SWAP_PART].p_fstype = FS_SWAP; /* swap partition */
lp->d_partitions[LABEL_PART].p_size = size;
lp->d_npartitions = LABEL_PART + 1;
strncpy(lp->d_packname, name, min(sizeof(lp->d_packname), sizeof(name)));
lp->d_checksum = dkcksum(lp);
}
/* Write a volume label. This implements the VINUM_LABEL ioctl. */
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_allocated) /* invalid volume */
return ENOENT;
vol = &VOL[volno]; /* volume in question */
if (vol->state <= volume_uninit) /* nothing there */
return ENXIO;
else if (vol->state < volume_up) /* not accessible */
return EIO; /* I/O error */
get_volume_label(vol->name, vol->plexes, vol->size, 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 = makedev(VINUM_CDEV_MAJOR, vol->volno); /* 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_iocmd = BIO_WRITE;
/*
* This should read:
*
* vinumstrategy (bp);
*
* Negotiate with phk to get it fixed.
*/
DEV_STRATEGY(bp, 0);
error = bufwait(bp);
bp->b_flags |= B_INVAL | B_AGE;
bp->b_ioflags &= ~BIO_ERROR;
brelse(bp);
return error;
}
/* Look at all disks on the system for vinum slices */
int
vinum_scandisk(char *devicename[], int drives)
{
struct drive *volatile drive;
volatile int driveno;
int firstdrive; /* first drive in this list */
volatile int gooddrives; /* number of usable drives found */
int firsttime; /* set if we have never configured before */
int error;
char *config_text; /* read the config info from disk into here */
char *volatile cptr; /* pointer into config information */
char *eptr; /* end pointer into config information */
char *config_line; /* copy the config line to */
volatile int status;
int *volatile drivelist; /* list of drive indices */
#define DRIVENAMELEN 64
#define DRIVEPARTS 35 /* max partitions per drive, excluding c */
char partname[DRIVENAMELEN]; /* for creating partition names */
status = 0; /* success indication */
vinum_conf.flags |= VF_READING_CONFIG; /* reading config from disk */
gooddrives = 0; /* number of usable drives found */
firstdrive = vinum_conf.drives_used; /* the first drive */
firsttime = vinum_conf.drives_used == 0; /* are we a virgin? */
/* allocate a drive pointer list */
drivelist = (int *) Malloc(drives * DRIVEPARTS * sizeof(int));
CHECKALLOC(drivelist, "Can't allocate memory");
/* Open all drives and find which was modified most recently */
for (driveno = 0; driveno < drives; driveno++) {
char part; /* UNIX partition */
int slice;
int founddrive; /* flag when we find a vinum drive */
founddrive = 0; /* no vinum drive found yet on this spindle */
/* first try the partition table */
for (slice = 1; slice < 5; slice++)
for (part = 'a'; part < 'i'; part++) {
if (part != 'c') { /* don't do the c partition */
snprintf(partname,
DRIVENAMELEN,
"%ss%d%c",
devicename[driveno],
slice,
part);
drive = check_drive(partname); /* try to open it */
if ((drive->lasterror != 0) /* didn't work, */
||(drive->state != drive_up))
free_drive(drive); /* get rid of it */
else if (drive->flags & VF_CONFIGURED) /* already read this config, */
log(LOG_WARNING,
"vinum: already read config from %s\n", /* say so */
drive->label.name);
else {
drivelist[gooddrives] = drive->driveno; /* keep the drive index */
drive->flags &= ~VF_NEWBORN; /* which is no longer newly born */
gooddrives++;
founddrive++;
}
}
}
if (founddrive == 0) { /* didn't find anything, */
for (part = 'a'; part < 'i'; part++) /* try the compatibility partition */
if (part != 'c') { /* don't do the c partition */
snprintf(partname, /* /dev/sd0a */
DRIVENAMELEN,
"%s%c",
devicename[driveno],
part);
drive = check_drive(partname); /* try to open it */
if ((drive->lasterror != 0) /* didn't work, */
||(drive->state != drive_up))
free_drive(drive); /* get rid of it */
else if (drive->flags & VF_CONFIGURED) /* already read this config, */
log(LOG_WARNING,
"vinum: already read config from %s\n", /* say so */
drive->label.name);
else {
drivelist[gooddrives] = drive->driveno; /* keep the drive index */
drive->flags &= ~VF_NEWBORN; /* which is no longer newly born */
gooddrives++;
}
}
}
}
if (gooddrives == 0) {
log(LOG_WARNING, "vinum: no drives found\n");
return ENOENT;
}
/*
* We now have at least one drive
* open. Sort them in order of config time
* and merge the config info with what we
* have already.
*/
qsort(drivelist, gooddrives, sizeof(int), drivecmp);
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");
for (driveno = 0; driveno < gooddrives; driveno++) { /* now include the config */
drive = &DRIVE[drivelist[driveno]]; /* point to the drive */
if (firsttime && (driveno == 0)) /* we've never configured before, */
log(LOG_INFO, "vinum: reading configuration from %s\n", drive->devicename);
else
log(LOG_INFO, "vinum: updating configuration from %s\n", drive->devicename);
if (drive->state == drive_up)
/* Read in both copies of the configuration information */
error = read_drive(drive, config_text, MAXCONFIG * 2, VINUM_CONFIG_OFFSET);
else {
error = EIO;
printf("vinum_scandisk: %s is %s\n", drive->devicename, drive_state(drive->state));
}
if (error != 0) {
log(LOG_ERR, "vinum: Can't read device %s, error %d\n", drive->devicename, error);
free_drive(drive); /* give it back */
status = error;
}
/*
* 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.
*/
else {
vinum_conf.drives_used++; /* another drive in use */
/* 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, 1); /* 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.
*/
log(LOG_ERR,
"vinum: Config error on %s, aborting integration\n",
drive->devicename);
free_drive(drive); /* give it back */
status = EINVAL;
}
}
while (*cptr == '\n')
cptr++; /* skip to next line */
}
}
drive->flags |= VF_CONFIGURED; /* read this drive's configuration */
}
Free(config_text);
Free(drivelist);
vinum_conf.flags &= ~VF_READING_CONFIG; /* no longer reading from disk */
if (status != 0)
printf("vinum: couldn't read configuration");
else
updateconfig(VF_READING_CONFIG); /* update from disk config */
return status;
}
/*
* Compare the modification dates of the drives, for qsort.
* Return 1 if a < b, 0 if a == b, 01 if a > b: in other
* words, sort backwards.
*/
int
drivecmp(const void *va, const void *vb)
{
const struct drive *a = &DRIVE[*(const int *) va];
const struct drive *b = &DRIVE[*(const int *) vb];
if ((a->label.last_update.tv_sec == b->label.last_update.tv_sec)
&& (a->label.last_update.tv_usec == b->label.last_update.tv_usec))
return 0;
else if ((a->label.last_update.tv_sec > b->label.last_update.tv_sec)
|| ((a->label.last_update.tv_sec == b->label.last_update.tv_sec)
&& (a->label.last_update.tv_usec > b->label.last_update.tv_usec)))
return -1;
else
return 1;
}
/* Local Variables: */
/* fill-column: 50 */
/* End: */
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