FreeBSD-5.3/sys/dev/vinum/vinumio.c
/*-
* 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 1.39 2003/05/23 00:59:53 grog Exp grog $
* $FreeBSD: src/sys/dev/vinum/vinumio.c,v 1.100 2004/06/22 06:38:01 le Exp $
*/
#include <dev/vinum/vinumhdr.h>
#include <dev/vinum/request.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 thread *td, int verbose)
{
struct cdevsw *dsw; /* pointer to cdevsw entry */
if (drive->flags & VF_OPEN) /* open already, */
return EBUSY; /* don't do it again */
drive->dev = getdiskbyname(drive->devicename);
if (drive->dev == NULL) /* didn't find anything */
return ENOENT;
dev_ref(drive->dev);
drive->dev->si_iosize_max = DFLTPHYS;
dsw = devsw(drive->dev);
if (dsw == NULL) /* sanity, should not happen */
drive->lasterror = ENOENT;
else if ((dsw->d_flags & D_DISK) == 0)
drive->lasterror = ENOTBLK;
else {
DROP_GIANT();
drive->lasterror = (dsw->d_open) (drive->dev, FWRITE | FREAD, 0, td);
PICKUP_GIANT();
}
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->sectorsize;
/* Now update the label part */
bcopy(hostname, drive->label.sysname, VINUMHOSTNAMELEN); /* put in host name */
microtime(&drive->label.date_of_birth); /* and current time */
drive->label.drive_size = drive->mediasize; /* size of the drive in bytes */
#ifdef 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)
{
drive->lasterror = open_drive(drive, curthread, verbose); /* open the drive */
if (drive->lasterror)
return drive->lasterror;
DROP_GIANT();
drive->lasterror = (*devsw(drive->dev)->d_ioctl) (drive->dev,
DIOCGSECTORSIZE,
(caddr_t) & drive->sectorsize,
FREAD,
curthread);
if (drive->lasterror == 0)
drive->lasterror = (*devsw(drive->dev)->d_ioctl) (drive->dev,
DIOCGMEDIASIZE,
(caddr_t) & drive->mediasize,
FREAD,
curthread);
PICKUP_GIANT();
if (drive->lasterror) {
if (verbose)
log(LOG_ERR,
"vinum: Can't get drive dimensions for %s: error %d\n",
drive->devicename,
drive->lasterror);
close_drive(drive);
return drive->lasterror;
}
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)
{
int error;
/*
* 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.
*/
DROP_GIANT();
error = (*devsw(drive->dev)->d_close) (drive->dev, FWRITE | FREAD, 0, NULL);
PICKUP_GIANT();
drive->flags &= ~VF_OPEN; /* no longer open */
if (drive->lasterror == 0)
drive->lasterror = error;
}
/*
* 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->sectorsize; /* block number */
bp->b_offset = offset;
bp->b_iooffset = offset;
bp->b_saveaddr = bp->b_data;
bp->b_data = buf;
bp->b_bcount = len;
DEV_STRATEGY(bp); /* 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_name(devicename, 1); /* if entry doesn't exist, create it */
drive = &vinum_conf.drive[driveno]; /* and get a pointer */
if (drive->state >= drive_down) /* up or down, we know it */
return drive;
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 */
}
}
}
return drive;
} else { /* not ours, */
close_drive(drive);
free_drive(drive); /* get rid of it */
return NULL;
}
}
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 */
s = sappend("\n", s);
}
}
/* Then the plex configuration */
for (i = 0; i < vinum_conf.plexes_allocated; i++) {
struct plex *plex;
struct volume *vol;
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 */
vol = &VOL[plex->volno];
snprintf(s,
configend - s,
"vol %s ",
vol->name);
while (*s)
s++; /* find the end */
if ((vol->preferred_plex >= 0) /* has a preferred plex */
&&vol->plex[vol->preferred_plex] == i) /* and it's us */
snprintf(s, configend - s, "preferred ");
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*";
snprintf(s,
configend - s,
"sd name %s drive %s len %llus driveoffset %llus state %s",
sd->name,
drivename,
(unsigned long long) sd->sectors,
(unsigned long long) sd->driveoffset,
sd_state(sd->state));
while (*s)
s++; /* find the end */
if (sd->plexno >= 0)
snprintf(s,
configend - s,
" plex %s plexoffset %llds",
vinum_conf.plex[sd->plexno].name,
(long long) sd->plexoffset);
else
snprintf(s, configend - s, " detached");
while (*s)
s++; /* find the end */
if (sd->flags & VF_RETRYERRORS) {
snprintf(s, configend - s, " retryerrors");
while (*s)
s++; /* find the end */
}
snprintf(s, configend - s, " \n");
while (*s)
s++; /* find the end */
}
}
if (s > &config[len - 2])
panic("vinum: configuration data overflow");
}
/*
* issue a save config request to the dæmon. The actual work
* is done in process context by daemon_save_config.
*/
void
save_config(void)
{
queue_daemon_request(daemonrq_saveconfig, (union daemoninfo) 0);
}
/*
* Write the configuration to all vinum slices. This
* is performed by the daemon 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 */
/* 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) {
microtime(&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 */
error = write_drive(drive,
(char *) vhdr,
VINUMHEADERLEN,
VINUM_LABEL_OFFSET);
if (error == 0) /* first config copy */
error = write_drive(drive,
config,
MAXCONFIG,
VINUM_CONFIG_OFFSET);
if (error == 0)
error = write_drive(drive, /* second copy */
config,
MAXCONFIG,
VINUM_CONFIG_OFFSET + MAXCONFIG);
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);
}
/*
* Search disks on system for vinum slices and add
* them to the configuuration if they're not
* there already. devicename is a blank-separate
* list of device names. If not provided, use
* sysctl to get a list of all disks on the
* system.
*
* Return an error indication.
*/
int
vinum_scandisk(char *devicename)
{
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 *drivelist; /* list of drive indices */
char *partname; /* for creating partition names */
char *cp; /* pointer to start of disk name */
char *ep; /* and to first char after name */
char *np; /* name pointer in naem we build */
size_t alloclen;
int malloced;
int partnamelen; /* length of partition name */
int drives;
int goodpart; /* good vinum drives on this disk */
malloced = 0; /* devicename not malloced */
if (devicename == NULL) { /* no devices specified, */
/* get a list of all disks in the system */
/* Get size of disk list */
error = kernel_sysctlbyname(&thread0, "kern.disks", NULL,
NULL, NULL, 0, &alloclen);
if (error) {
log(LOG_ERR, "vinum: can't get disk list: %d\n", error);
return EINVAL;
}
devicename = Malloc(alloclen);
if (devicename == NULL) {
printf("vinum: can't allocate memory for drive list");
return ENOMEM;
} else
malloced = 1;
/* Now get the list of disks */
kernel_sysctlbyname(&thread0, "kern.disks", devicename,
&alloclen, NULL, 0, NULL);
}
status = 0; /* success indication */
vinum_conf.flags |= VF_READING_CONFIG; /* reading config from disk */
partname = Malloc(MAXPATHLEN); /* extract name of disk here */
if (partname == NULL) {
printf("vinum_scandisk: can't allocate memory for drive name");
return ENOMEM;
}
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 */
drives = 256; /* should be enough for most cases */
drivelist = (int *) Malloc(drives * sizeof(int));
CHECKALLOC(drivelist, "Can't allocate memory");
error = lock_config(); /* make sure we're alone here */
if (error)
return error;
error = setjmp(command_fail); /* come back here on error */
if (error) /* longjmped out */
return error;
/* Open all drives and find which was modified most recently */
for (cp = devicename; *cp; cp = ep) {
char part; /* UNIX partition */
#ifdef __i386__
int slice;
#endif
while (*cp == ' ')
cp++; /* find start of name */
if (*cp == '\0') /* done, */
break;
ep = cp;
while (*ep && (*ep != ' ')) /* find end of name */
ep++;
np = partname; /* start building up a name here */
if (*cp != '/') { /* name doesn't start with /, */
strcpy(np, "/dev/"); /* assume /dev */
np += strlen("/dev/");
}
memcpy(np, cp, ep - cp); /* put in name */
np += ep - cp; /* and point past */
goodpart = 0; /* no partitions on this disk yet */
partnamelen = MAXPATHLEN + np - partname; /* remaining length in partition name */
#ifdef __i386__
/* 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(np,
partnamelen,
"s%d%c",
slice,
part);
drive = check_drive(partname); /* try to open it */
if (drive) { /* got something, */
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 {
if (gooddrives == drives) /* ran out of entries */
EXPAND(drivelist, int, drives, drives); /* double the size */
drivelist[gooddrives] = drive->driveno; /* keep the drive index */
drive->flags &= ~VF_NEWBORN; /* which is no longer newly born */
gooddrives++;
goodpart++;
}
}
}
}
#endif
/*
* If the machine doesn't have a BIOS
* partition table, try normal devices.
*/
if (goodpart == 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(np,
partnamelen,
"%c",
part);
drive = check_drive(partname); /* try to open it */
if (drive) { /* got something, */
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 {
if (gooddrives == drives) /* ran out of entries */
EXPAND(drivelist, int, drives, drives); /* double the size */
drivelist[gooddrives] = drive->driveno; /* keep the drive index */
drive->flags &= ~VF_NEWBORN; /* which is no longer newly born */
gooddrives++;
goodpart++;
}
}
}
}
}
Free(partname);
if (gooddrives == 0) {
if (firsttime)
log(LOG_WARNING, "vinum: no drives found\n");
else
log(LOG_INFO, "vinum: no additional drives found\n");
if (malloced)
Free(devicename);
unlock_config();
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 */
/*
* parse_config recognizes referenced
* drives and builds a drive entry for
* them. This may expand the drive
* table, thus invalidating the pointer.
*/
drive = &DRIVE[drivelist[driveno]]; /* point to the drive */
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; /* this drive's configuration is complete */
}
Free(config_line);
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 */
if (malloced)
Free(devicename);
unlock_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: */