diff options
Diffstat (limited to 'sys/modules/vinum/config.c')
| -rw-r--r-- | sys/modules/vinum/config.c | 1712 |
1 files changed, 1712 insertions, 0 deletions
diff --git a/sys/modules/vinum/config.c b/sys/modules/vinum/config.c new file mode 100644 index 000000000000..fd31c5e07c46 --- /dev/null +++ b/sys/modules/vinum/config.c @@ -0,0 +1,1712 @@ +/* To do: + + * Don't store drive configuration on the config DB: read each drive's header + * to decide where it is. + * + * Accept any old crap in the config_<foo> functions, and complain when + * we try to bring it up. + * + * When trying to bring volumes up, check that the complete address range + * is covered. + */ +/*- + * 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: config.c,v 1.17 1998/08/14 04:49:26 grog Exp grog $ + */ + +#define STATIC /* nothing while we're testing XXX */ + +#define REALLYKERNEL +#include "vinumhdr.h" + +extern jmp_buf command_fail; /* return on a failed command */ + +#if __FreeBSD__ >= 3 +/* Why aren't these declared anywhere? XXX */ +void longjmp(jmp_buf, int); +#endif + +#define MAXTOKEN 64 /* maximum number of tokens in a line */ + +/* We can afford the luxury of global variables here, + * since start_config ensures that these functions + * are single-threaded. */ + +/* These are indices in vinum_conf of the last-mentioned of each kind of object */ +static int current_drive = -1; /* note the last drive we mention, for + * some defaults */ +static int current_plex = -1; /* and the same for the last plex */ +static int current_volume = -1; /* and the last volme */ +static struct _ioctl_reply *ioctl_reply; /* struct to return via ioctl */ + + +/* These values are used by most of these routines, so set them as globals */ +static char *token[MAXTOKEN]; /* pointers to individual tokens */ +static int tokens; /* number of tokens */ + +#define TOCONS 0x01 +#define TOTTY 0x02 +#define TOLOG 0x04 + +struct putchar_arg { + int flags; + struct tty *tty; +}; + +#define MSG_MAX 1024 /* maximum length of a formatted message */ +/* Format an error message and return to the user in the reply. + * CARE: This routine is designed to be called only from the + * configuration routines, so it assumes it's the owner of + * the configuration lock, and unlocks it on exit */ +void +throw_rude_remark(int error, char *msg,...) +{ + BROKEN_GDB; + int retval; + va_list ap; + char *text; + static int finishing; /* don't recurse */ + int was_finishing; + + va_start(ap, msg); + if ((ioctl_reply != NULL) /* we're called from the user */ + &&(!(vinum_conf.flags & VF_KERNELOP))) { /* and we're not doing kernel things: return msg */ + /* XXX We can't just format to ioctl_reply, since it + * may contain our input parameters */ + text = Malloc(MSG_MAX); + if (text == NULL) { + printf("vinum: can't allocate error message buffer"); + printf("vinum: "); + vprintf(msg, ap); /* print to the console */ + printf("\n"); + } else { + retval = kvprintf(msg, NULL, (void *) text, 10, ap); + text[retval] = '\0'; /* delimit */ + strcpy(ioctl_reply->msg, text); + ioctl_reply->error = error; /* first byte is the error number */ + Free(text); + } + } else { + printf("vinum: "); + vprintf(msg, ap); /* print to the console */ + printf("\n"); + } + va_end(ap); + + if (vinum_conf.flags & VF_READING_CONFIG) /* go through to the bitter end, */ + return; + /* We have a problem here: we want to unlock the + * configuration, which implies tidying up, but + * if we find an error while tidying up, we could + * recurse for ever. Use this kludge to only try + * once */ + was_finishing = finishing; + finishing = 1; + finish_config(was_finishing); /* unlock anything we may be holding */ + finishing = was_finishing; + longjmp(command_fail, error); +} + +/* Function declarations */ +int atoi(char *); /* no atoi in the kernel */ + +/* Minimal version of atoi */ +int +atoi(char *s) +{ /* no atoi in the kernel */ + BROKEN_GDB; + int r = 0; + int sign = 1; + + while (((*s >= '0') && (*s <= '9')) || (*s == '-')) { + if (*s == '-') + sign = -sign; + else + r = r * 10 + (*s - '0'); + } + return r; +} + +/* Find index of volume in vinum_conf. Return the index + * if found, or -1 if not */ +int +volume_index(struct volume *vol) +{ + BROKEN_GDB; + int i; + + for (i = 0; i < vinum_conf.volumes_used; i++) + if (&VOL[i] == vol) + return i; + return -1; +} + +/* Find index of plex in vinum_conf. Return the index + * if found, or -1 if not */ +int +plex_index(struct plex *plex) +{ + BROKEN_GDB; + int i; + + for (i = 0; i < vinum_conf.plexes_used; i++) + if (&PLEX[i] == plex) + return i; + return -1; +} + +/* Find index of subdisk in vinum_conf. Return the index + * if found, or -1 if not */ +int +sd_index(struct sd *sd) +{ + BROKEN_GDB; + int i; + + for (i = 0; i < vinum_conf.subdisks_used; i++) + if (&SD[i] == sd) + return i; + return -1; +} + +/* Find index of drive in vinum_conf. Return the index + * if found, or -1 if not */ +int +drive_index(struct drive *drive) +{ + BROKEN_GDB; + int i; + + for (i = 0; i < vinum_conf.drives_used; i++) + if (&DRIVE[i] == drive) + return i; + return -1; +} + +/* Check a volume to see if the plex is already assigned to it. + * Return index in volume->plex, or -1 if not assigned */ +int +my_plex(int volno, int plexno) +{ + BROKEN_GDB; + int i; + struct volume *vol; + + vol = &VOL[volno]; /* point to volno */ + for (i = 0; i < vol->plexes; i++) + if (vol->plex[i] == plexno) + return i; + return -1; /* not found */ +} + +/* Check a plex to see if the subdisk is already assigned to it. + * Return index in plex->sd, or -1 if not assigned */ +int +my_sd(int plexno, int sdno) +{ + BROKEN_GDB; + int i; + struct plex *plex; + + plex = &PLEX[plexno]; + for (i = 0; i < plex->subdisks; i++) + if (plex->sdnos[i] == sdno) + return i; + return -1; /* not found */ +} + +/* Check that this operation is being done in the kernel. + * longjmp out if not. op the name of the operation. */ +void +checkkernel(char *op) +{ + BROKEN_GDB; + if (vinum_conf.flags & VF_KERNELOP == 0) + throw_rude_remark(EPERM, "Can't perform '%s' from user space", op); +} + +/* Add plex to the volume if possible */ +int +give_plex_to_volume(int volno, int plexno) +{ + BROKEN_GDB; + struct volume *vol; + + /* XXX It's not an error for the plex to already + * belong to the volume, but we need to check a + * number of things to make sure it's done right. + * Some day. */ + if (my_plex(volno, plexno) >= 0) + return plexno; /* that's it */ + + vol = &VOL[volno]; /* point to volume */ + if (vol->plexes == MAXPLEX) /* all plexes allocated */ + throw_rude_remark(ENOSPC, + "Too many plexes for volume %s", + vol->name); + vol->plex[vol->plexes] = plexno; /* this one */ + vol->plexes++; /* add another plex */ + PLEX[plexno].volno = volno; /* note the number of our volume */ + + return vol->plexes - 1; /* and return its index */ +} + +/* Add subdisk to a plex if possible */ +int +give_sd_to_plex(int plexno, int sdno) +{ + BROKEN_GDB; + int i; + struct plex *plex; + struct sd *sd; + + /* XXX It's not an error for the sd to already + * belong to the plex, but we need to check a + * number of things to make sure it's done right. + * Some day. */ + i = my_sd(plexno, sdno); + if (i >= 0) /* does it already belong to us? */ + return i; /* that's it */ + + plex = &PLEX[plexno]; /* point to the plex */ + sd = &SD[sdno]; /* and the subdisk */ + + /* Do we have an offset? Otherwise put it after the last one */ + if (sd->plexoffset < 0) { /* no offset specified */ + if (plex->subdisks > 0) { + struct sd *lastsd = &SD[plex->sdnos[plex->subdisks - 1]]; /* last subdisk */ + sd->plexoffset = lastsd->sectors + lastsd->plexoffset; /* take it */ + } else /* first subdisk */ + sd->plexoffset = 0; /* start at the beginning */ + } + plex->subdisks++; /* another entry */ + if (plex->subdisks >= plex->subdisks_allocated) /* need more space */ + EXPAND(plex->sdnos, int, plex->subdisks_allocated, INITIAL_SUBDISKS_IN_PLEX); + + /* XXX I'm not sure this makes any sense + * for anything except concatenated plexes, + * and it comes up with the wrong answer for + * RAID-5 plexes, but it's currently needed + * for the calculations. We'll adjust for + * RAID-5 in config_plex */ + if ((sd->sectors + sd->plexoffset) > plex->length) { /* gone beyond the end of the plex */ + plex->length = sd->sectors + sd->plexoffset; /* adjust the length */ + + if ((plex->volno >= 0) /* we have a volume */ + &&(plex->length > VOL[plex->volno].size)) /* and we're now the longest plex */ + VOL[plex->volno].size = plex->length; /* increase the size of the volume */ + } + /* We need to check that the subdisks don't overlap, + * but we can't do that until a point where we *must* + * know the size of all the subdisks. That's not + * here. But we need to sort them by offset */ + for (i = 0; i < plex->subdisks - 1; i++) { + if (sd->plexoffset < SD[plex->sdnos[i]].plexoffset) { /* it fits before this one */ + /* First move any remaining subdisks by one */ + int j; + + for (j = plex->subdisks - 1; j > i; j--) /* move up one at a time */ + plex->sdnos[j] = plex->sdnos[j - 1]; + plex->sdnos[i] = sdno; + return i; + } + } + + /* The plex doesn't have any subdisk with a larger + * offset. Insert it */ + plex->sdnos[i] = sdno; + return i; +} + +/* Add a subdisk to drive if possible. The pointer to the drive + * must already be stored in the sd structure, but the drive + * doesn't know about the subdisk yet. */ +static void +give_sd_to_drive(int sdno) +{ + BROKEN_GDB; + struct sd *sd; /* pointer to subdisk */ + struct drive *drive; /* and drive */ + int fe; /* index in free list */ + + sd = &SD[sdno]; /* point to sd */ + drive = &DRIVE[sd->driveno]; /* and drive */ + + if (drive->state != drive_up) /* not up */ + throw_rude_remark(EIO, "Drive %s is not accessible", drive->label.name); + else if (sd->sectors > drive->sectors_available) { /* too big, */ + sd->driveoffset = -1; /* don't be confusing */ + throw_rude_remark(ENOSPC, "No space for %s on %s", sd->name, drive->label.name); + } + drive->subdisks_used++; /* one more subdisk */ + + /* no offset specified, find one */ + if (sd->driveoffset < 0) { + for (fe = 0; fe < drive->freelist_entries; fe++) { + if (drive->freelist[fe].sectors >= sd->sectors) { /* it'll fit here */ + sd->driveoffset = drive->freelist[fe].offset; + if (sd->sectors == drive->freelist[fe].sectors) { /* used up the entire entry */ + if (fe < (drive->freelist_entries - 1)) /* not the last one, */ + bcopy(&drive->freelist[fe + 1], + &drive->freelist[fe], + (drive->freelist_entries - fe) * sizeof(struct drive_freelist)); + drive->freelist_entries--; /* one less entry */ + } else { + drive->freelist[fe].sectors -= sd->sectors; /* this much less space */ + drive->freelist[fe].offset += sd->sectors; /* this much further on */ + } + drive->sectors_available -= sd->sectors; /* and note how much less space we have */ + break; + } + } + if (fe == drive->freelist_entries) + /* Didn't find anything. Although the drive has + * enough space, it's too fragmented */ + { + sd->driveoffset = -1; /* don't be confusing */ + throw_rude_remark(ENOSPC, "No space for %s on %s", sd->name, drive->label.name); + } + } else { /* specific offset */ + /* For a specific offset to work, the space must be + * entirely in a single freelist entry. Look for it. */ + u_int64_t sdend = sd->driveoffset + sd->sectors; /* end of our subdisk */ + for (fe = 0; fe < drive->freelist_entries; fe++) { + u_int64_t dend = drive->freelist[fe].offset + drive->freelist[fe].sectors; /* end of entry */ + if (dend >= sdend) { /* fits before here */ + if (drive->freelist[fe].offset > sd->driveoffset) /* starts after the beginning of sd area */ + throw_rude_remark(ENOSPC, + "No space for subdisk %s on drive %s at offset %qd\n", + sd->name, + drive->label.name); + + /* We've found the space, and we can allocate it. + * We don't need to say that to the subdisk, which + * already knows about it. We need to tell it to + * the free list, though. We have four possibilities: + * + * 1. The subdisk exactly eats up the entry. That's the + * same as above. + * 2. The subdisk starts at the beginning and leaves space + * at the end. + * 3. The subdisk starts after the beginning and leaves + * space at the end as well: we end up with another + * fragment. + * 4. The subdisk leaves space at the beginning and finishes + * at the end. + */ + drive->sectors_available -= sd->sectors; /* note how much less space we have */ + if (sd->driveoffset == drive->freelist[fe].offset) { /* 1 or 2 */ + if (sd->sectors == drive->freelist[fe].sectors) { /* 1: used up the entire entry */ + if (fe < (drive->freelist_entries - 1)) /* not the last one, */ + bcopy(&drive->freelist[fe + 1], + &drive->freelist[fe], + (drive->freelist_entries - fe) * sizeof(struct drive_freelist)); + drive->freelist_entries--; /* one less entry */ + } else { /* 2: space at the end */ + drive->freelist[fe].sectors -= sd->sectors; /* this much less space */ + drive->freelist[fe].offset += sd->sectors; /* this much further on */ + } + } else { /* 3 or 4 */ + drive->freelist[fe].sectors = sd->driveoffset - drive->freelist[fe].offset; + if (dend > sdend) { /* 3: space at the end as well */ + if (fe < (drive->freelist_entries - 1)) /* not the last one */ + bcopy(&drive->freelist[fe], /* move the rest down */ + &drive->freelist[fe + 1], + (drive->freelist_entries - fe) * sizeof(struct drive_freelist)); + drive->freelist_entries++; /* one less entry */ + drive->freelist[fe + 1].offset = sdend; /* second entry starts after sd */ + drive->freelist[fe + 1].sectors = dend - sdend; /* and is this long */ + } + } + break; + } + } + } + drive->opencount++; /* one more subdisk attached */ +} + +/* Get an empty drive entry from the drive table */ +int +get_empty_drive(void) +{ + BROKEN_GDB; + int driveno; + struct drive *drive; + + /* first see if we have one which has been deallocated */ + for (driveno = 0; driveno < vinum_conf.drives_used; driveno++) { + if (DRIVE[driveno].state == drive_unallocated) /* bingo */ + break; + } + + if (driveno >= vinum_conf.drives_used) + /* Couldn't find a deallocated drive. Allocate a new one */ + { + vinum_conf.drives_used++; + if (vinum_conf.drives_used > vinum_conf.drives_allocated) /* we've used all our allocation */ + EXPAND(DRIVE, struct drive, vinum_conf.drives_allocated, INITIAL_DRIVES); + } + /* got a drive entry. Make it pretty */ + drive = &DRIVE[driveno]; + bzero(drive, sizeof(struct drive)); + drive->driveno = driveno; /* put number in structure */ + return driveno; /* return the index */ +} + +/* Find the named drive in vinum_conf.drive, return a pointer + * return the index in vinum_conf.drive. + * Don't mark the drive as allocated (XXX MP) + * If create != 0, create an entry if it doesn't exist + */ +/* XXX check if we have it open from attach */ +int +find_drive(const char *name, int create) +{ + BROKEN_GDB; + int driveno; + struct drive *drive; + + if (name != NULL) { + for (driveno = 0; driveno < vinum_conf.drives_used; driveno++) { + drive = &DRIVE[driveno]; /* point to drive */ + if ((drive->label.name[0] != '\0') /* it has a name */ + &&(strcmp(drive->label.name, name) == 0)) /* and it's this one: found */ + return driveno; + } + } + /* the drive isn't in the list. Add it if he wants */ + if (create == 0) /* don't want to create */ + return -1; /* give up */ + + driveno = get_empty_drive(); + drive = &DRIVE[driveno]; + if (name != NULL) + bcopy(name, /* put in its name */ + drive->label.name, + min(sizeof(drive->label.name), + strlen(name))); + drive->state = drive_uninit; /* in use, nothing worthwhile there */ + return driveno; /* return the index */ +} + +/* Find a drive given its device name. + * devname must be valid. + * Otherwise the same as find_drive above */ +int +find_drive_by_dev(const char *devname, int create) +{ + BROKEN_GDB; + int driveno; + struct drive *drive; + + for (driveno = 0; driveno < vinum_conf.drives_used; driveno++) { + drive = &DRIVE[driveno]; /* point to drive */ + if ((drive->label.name[0] != '\0') /* it has a name */ + &&(strcmp(drive->label.name, devname) == 0)) /* and it's this one: found */ + return driveno; + } + + /* the drive isn't in the list. Add it if he wants */ + if (create == 0) /* don't want to create */ + return -1; /* give up */ + + driveno = get_empty_drive(); + drive = &DRIVE[driveno]; + bcopy(devname, /* put in its name */ + drive->devicename, + min(sizeof(drive->devicename), + strlen(devname))); + drive->state = drive_uninit; /* in use, nothing worthwhile there */ + return driveno; /* return the index */ +} + +/* Find an empty subdisk in the subdisk table */ +int +get_empty_sd(void) +{ + BROKEN_GDB; + int sdno; + struct sd *sd; + + /* first see if we have one which has been deallocated */ + for (sdno = 0; sdno < vinum_conf.subdisks_used; sdno++) { + if (SD[sdno].state == sd_unallocated) /* bingo */ + break; + } + + if (sdno >= vinum_conf.subdisks_used) { /* No unused sd found. Allocate a new one */ + vinum_conf.subdisks_used++; + if (vinum_conf.subdisks_used > vinum_conf.subdisks_allocated) + EXPAND(SD, struct sd, vinum_conf.subdisks_allocated, INITIAL_SUBDISKS); + } + /* initialize some things */ + sd = &SD[sdno]; /* point to it */ + bzero(sd, sizeof(struct sd)); /* initialize */ + sd->plexno = -1; /* no plex */ + sd->driveno = -1; /* and no drive */ + sd->plexoffset = -1; /* and no offsets */ + sd->driveoffset = -1; + return sdno; /* return the index */ +} + +/* return a drive to the free pool */ +void +free_drive(struct drive *drive) +{ + BROKEN_GDB; + if (drive->vp != NULL) /* device open */ + vn_close(drive->vp, FREAD | FWRITE, FSCRED, drive->p); + bzero(drive, sizeof(struct drive)); /* this also sets drive_unallocated */ +} + +/* Find the named subdisk in vinum_conf.sd. + + * If create != 0, create an entry if it doesn't exist + * + * Return index in vinum_conf.sd + */ +int +find_subdisk(const char *name, int create) +{ + BROKEN_GDB; + int sdno; + struct sd *sd; + + for (sdno = 0; sdno < vinum_conf.subdisks_allocated; sdno++) { + if (strcmp(SD[sdno].name, name) == 0) /* found it */ + return sdno; + } + + /* the subdisk isn't in the list. Add it if he wants */ + if (create == 0) /* don't want to create */ + return -1; /* give up */ + + /* Allocate one and insert the name */ + sdno = get_empty_sd(); + sd = &SD[sdno]; + bcopy(name, sd->name, min(sizeof(sd->name), strlen(name))); /* put in its name */ + return sdno; /* return the pointer */ +} + +/* Free an allocated sd entry + * This performs memory management only. remove() + * is responsible for checking relationships. + */ +void +free_sd(int sdno) +{ + BROKEN_GDB; + struct sd *sd; + struct drive *drive; + int fe; /* free list entry */ + u_int64_t sdend; /* end of our subdisk */ + u_int64_t dend; /* end of our freelist entry */ + + sd = &SD[sdno]; + if ((sd->driveno >= 0) /* we have a drive, */ + &&(sd->sectors > 0)) { /* and some space on it */ + drive = &DRIVE[sd->driveno]; + sdend = sd->driveoffset + sd->sectors; /* end of our subdisk */ + + /* Look for where to return the sd address space */ + for (fe = 0; + (fe < drive->freelist_entries) && (drive->freelist[fe].offset < sd->driveoffset); + fe++); + /* Now we are pointing to the last entry, the first + * with a higher offset than the subdisk, or both. */ + if ((fe > 1) /* not the first entry */ + &&((fe == drive->freelist_entries) /* gone past the end */ + ||(drive->freelist[fe].offset > sd->driveoffset))) /* or past the block were looking for */ + fe--; /* point to the block before */ + dend = drive->freelist[fe].offset + drive->freelist[fe].sectors; /* end of the entry */ + + /* At this point, we are pointing to the correct + * place in the free list. A number of possibilities + * exist: + * + * 1. The block to be freed immediately follows + * the block to which we are pointing. Just + * enlarge it. + * 2. The block to be freed starts at the end of + * the current block and ends at the beginning + * of the following block. Merge the three + * areas into a single block. + * 3. The block to be freed starts after the end + * of the block and ends before the start of + * the following block. Create a new free block. + * 4. The block to be freed starts after the end + * of the block, but ends at the start of the + * following block. Enlarge the following block + * downwards. + * + */ + if (sd->driveoffset == dend) { /* it starts after the end of this block */ + if ((fe < drive->freelist_entries - 1) /* we're not the last block in the free list */ + &&(sdend == drive->freelist[fe + 1].offset)) { /* and the subdisk ends at the start of the + * next block */ + drive->freelist[fe].sectors = drive->freelist[fe + 1].sectors; /* 2: merge all three blocks */ + if (fe < drive->freelist_entries - 2) /* still more blocks after next */ + bcopy(&drive->freelist[fe + 2], /* move down one */ + &drive->freelist[fe + 1], + (drive->freelist_entries - 2 - fe) * sizeof(struct drive_freelist)); + drive->freelist_entries--; /* one less entry in the free list */ + } else /* 1: just enlarge this block */ + drive->freelist[fe].sectors += sd->sectors; + } else { + if (sd->driveoffset > dend) /* it starts after this block */ + fe++; /* so look at the next block */ + if ((fe < drive->freelist_entries) /* we're not the last block in the free list */ + &&(sdend == drive->freelist[fe].offset)) { /* and the subdisk ends at the start of + * this block: case 4 */ + drive->freelist[fe].offset = sd->driveoffset; /* it starts where the sd was */ + drive->freelist[fe].sectors += sd->sectors; /* and it's this much bigger */ + } else { /* case 3: non-contiguous */ + if (fe < drive->freelist_entries) /* not after the last block, */ + bcopy(&drive->freelist[fe], /* move the rest up one entry */ + &drive->freelist[fe + 1], + (drive->freelist_entries - fe) * sizeof(struct drive_freelist)); + drive->freelist_entries++; /* one less entry */ + drive->freelist[fe].offset = sd->driveoffset; /* this entry represents the sd */ + drive->freelist[fe].sectors = sd->sectors; + } + } + drive->opencount--; /* one less subdisk attached */ + } + bzero(sd, sizeof(struct sd)); /* and clear it out */ + sd->state = sd_unallocated; +} + +/* Find an empty plex in the plex table */ +int +get_empty_plex(void) +{ + BROKEN_GDB; + int plexno; + struct plex *plex; /* if we allocate one */ + + /* first see if we have one which has been deallocated */ + for (plexno = 0; plexno < vinum_conf.plexes_used; plexno++) { + if (PLEX[plexno].state == plex_unallocated) /* bingo */ + break; /* and get out of here */ + } + + if (plexno >= vinum_conf.plexes_used) { + /* Couldn't find a deallocated plex. Allocate a new one */ + vinum_conf.plexes_used++; + if (vinum_conf.plexes_used > vinum_conf.plexes_allocated) + EXPAND(PLEX, struct plex, vinum_conf.plexes_allocated, INITIAL_PLEXES); + } + /* Found a plex. Give it an sd structure */ + plex = &PLEX[plexno]; /* this one is ours */ + bzero(plex, sizeof(struct plex)); /* polish it up */ + plex->sdnos = (int *) Malloc(sizeof(int) * INITIAL_SUBDISKS_IN_PLEX); /* allocate sd table */ + CHECKALLOC(plex->sdnos, "vinum: Can't allocate plex subdisk table"); + bzero(plex->sdnos, (sizeof(int) * INITIAL_SUBDISKS_IN_PLEX)); /* do we need this? */ + plex->subdisks = 0; /* no subdisks in use */ + plex->subdisks_allocated = INITIAL_SUBDISKS_IN_PLEX; /* and we have space for this many */ + plex->organization = plex_disorg; /* and it's not organized */ + plex->volno = -1; /* no volume yet */ + return plexno; /* return the index */ +} + +/* Find the named plex in vinum_conf.plex + + * If create != 0, create an entry if it doesn't exist + * return index in vinum_conf.plex + */ +int +find_plex(const char *name, int create) +{ + BROKEN_GDB; + int plexno; + struct plex *plex; + + for (plexno = 0; plexno < vinum_conf.plexes_allocated; plexno++) { + if (strcmp(PLEX[plexno].name, name) == 0) /* found it */ + return plexno; + } + + /* the plex isn't in the list. Add it if he wants */ + if (create == 0) /* don't want to create */ + return -1; /* give up */ + + /* Allocate one and insert the name */ + plexno = get_empty_plex(); + plex = &PLEX[plexno]; /* point to it */ + bcopy(name, plex->name, min(sizeof(plex->name), strlen(name))); /* put in its name */ + return plexno; /* return the pointer */ +} + +/* Free an allocated plex entry + * and its associated memory areas */ +void +free_plex(int plexno) +{ + BROKEN_GDB; + struct plex *plex; + + plex = &PLEX[plexno]; + if (plex->sdnos) + Free(plex->sdnos); + if (plex->lock) + Free(plex->lock); + if (plex->defective_region) + Free(plex->defective_region); + if (plex->unmapped_region) + Free(plex->unmapped_region); + bzero(plex, sizeof(struct plex)); /* and clear it out */ + plex->state = plex_unallocated; +} + +/* Find an empty volume in the volume table */ +int +get_empty_volume(void) +{ + BROKEN_GDB; + int volno; + struct volume *vol; + + /* first see if we have one which has been deallocated */ + for (volno = 0; volno < vinum_conf.volumes_used; volno++) { + if (VOL[volno].state == volume_unallocated) /* bingo */ + break; + } + + if (volno >= vinum_conf.volumes_used) + /* Couldn't find a deallocated volume. Allocate a new one */ + { + vinum_conf.volumes_used++; + if (vinum_conf.volumes_used > vinum_conf.volumes_allocated) + EXPAND(VOL, struct volume, vinum_conf.volumes_allocated, INITIAL_VOLUMES); + } + /* Now initialize fields */ + vol = &VOL[volno]; + bzero(vol, sizeof(struct volume)); + vol->preferred_plex = -1; /* default to round robin */ + vol->preferred_plex = ROUND_ROBIN_READPOL; /* round robin */ + + return volno; /* return the index */ +} + +/* Find the named volume in vinum_conf.volume. + + * If create != 0, create an entry if it doesn't exist + * return the index in vinum_conf + */ +int +find_volume(const char *name, int create) +{ + BROKEN_GDB; + int volno; + struct volume *vol; + + for (volno = 0; volno < vinum_conf.volumes_used; volno++) { + if (strcmp(VOL[volno].name, name) == 0) /* found it */ + return volno; + } + + /* the volume isn't in the list. Add it if he wants */ + if (create == 0) /* don't want to create */ + return -1; /* give up */ + + /* Allocate one and insert the name */ + volno = get_empty_volume(); + vol = &VOL[volno]; + bcopy(name, vol->name, min(sizeof(vol->name), strlen(name))); /* put in its name */ + vol->blocksize = DEV_BSIZE; /* block size of this volume */ + return volno; /* return the pointer */ +} + +/* Free an allocated volume entry + * and its associated memory areas */ +void +free_volume(int volno) +{ + BROKEN_GDB; + struct volume *vol; + + vol = &VOL[volno]; + bzero(vol, sizeof(struct volume)); /* and clear it out */ + vol->state = volume_unallocated; +} + +/* Handle a drive definition. We store the information in the global variable + * drive, so we don't need to allocate. + * + * If we find an error, print a message and return + */ +void +config_drive(void) +{ + BROKEN_GDB; + enum drive_label_info partition_status; /* info about the partition */ + int parameter; + int driveno; /* index of drive in vinum_conf */ + struct drive *drive; /* and pointer to it */ + + if (tokens < 2) /* not enough tokens */ + throw_rude_remark(EINVAL, "Drive has no name"); + driveno = find_drive(token[1], 1); /* allocate a drive to initialize */ + drive = &DRIVE[driveno]; /* and get a pointer */ + + if (drive->state != drive_uninit) { /* we already know this drive */ + /* XXX Check which definition is more up-to-date. Give + * preference for the definition on its own drive */ + return; /* XXX */ + } + for (parameter = 2; parameter < tokens; parameter++) { /* look at the other tokens */ + switch (get_keyword(token[parameter], &keyword_set)) { + case kw_device: + parameter++; + if (drive->devicename[0] != '\0') { /* we know this drive... */ + if (strcmp(drive->devicename, token[parameter])) /* different name */ + close_drive(drive); /* close it if it's open */ + else /* no change */ + break; + } + bcopy(token[parameter], /* insert device information */ + drive->devicename, + min(sizeof(drive->devicename), + strlen(token[parameter]))); + /* open the device and get the configuration */ + partition_status = read_drive_label(drive); + if (partition_status == DL_CANT_OPEN) { /* not our kind */ + close_drive(drive); + if (drive->lasterror == EFTYPE) /* wrong kind of partition */ + throw_rude_remark(drive->lasterror, + "Drive %s has invalid partition type", + drive->label.name); + else /* I/O error of some kind */ + throw_rude_remark(drive->lasterror, + "Can't initialize drive %s", + drive->label.name); + } else if (partition_status == DL_WRONG_DRIVE) { /* valid drive, not ours */ + close_drive(drive); + throw_rude_remark(drive->lasterror, + "Incorrect drive name %s specified for drive %s", + token[1], + drive->label.name); + } + break; + + case kw_state: + checkkernel(token[++parameter]); /* must be a kernel user */ + drive->state = DriveState(token[parameter]); /* set the state */ + break; + + default: + close_drive(drive); + throw_rude_remark(EINVAL, + "Drive %s, invalid keyword: %s", + token[1], + token[parameter]); + } + } + + if (drive->devicename[0] == '\0') + throw_rude_remark(EINVAL, "No device name for %s", drive->label.name); + +} + +/* Handle a subdisk definition. We store the information in the global variable + * sd, so we don't need to allocate. + * + * If we find an error, print a message and return + */ +void +config_subdisk(void) +{ + BROKEN_GDB; + int parameter; + int sdno; /* index of sd in vinum_conf */ + struct sd *sd; /* and pointer to it */ + u_int64_t size; + int sectors; /* sector offset value */ + int detached = 0; /* set to 1 if this is a detached subdisk */ + int sdindex = -1; /* index in plexes subdisk table */ + + sdno = get_empty_sd(); /* allocate an SD to initialize */ + sd = &SD[sdno]; /* and get a pointer */ + for (parameter = 1; parameter < tokens; parameter++) { /* look at the other tokens */ + switch (get_keyword(token[parameter], &keyword_set)) { + case kw_detached: + detached = 1; + break; + + case kw_plexoffset: + size = sizespec(token[++parameter]); + if ((size % DEV_BSIZE) != 0) + throw_rude_remark(EINVAL, "sd %s, bad plex offset alignment: %qd", sd->name, size); + else + sd->plexoffset = size / DEV_BSIZE; + break; + + case kw_driveoffset: + size = sizespec(token[++parameter]); + if ((size % DEV_BSIZE) != 0) + throw_rude_remark(EINVAL, "sd %s, bad drive offset alignment: %qd", sd->name, size); + else + sd->driveoffset = size / DEV_BSIZE; + break; + + case kw_name: + ++parameter; + bcopy(token[parameter], + sd->name, + min(sizeof(sd->name), strlen(token[parameter]))); + break; + + case kw_len: + size = sizespec(token[++parameter]); + if ((size % DEV_BSIZE) != 0) + throw_rude_remark(EINVAL, "sd %s, length %d not multiple of sector size", sd->name, size); + else + sd->sectors = size / DEV_BSIZE; + break; + + case kw_drive: + sd->driveno = find_drive(token[++parameter], 1); /* insert drive information */ + break; + + case kw_plex: + sd->plexno = find_plex(token[++parameter], 1); /* insert plex information */ + break; + + case kw_state: + checkkernel(token[++parameter]); /* must be a kernel user */ + sd->state = SdState(token[parameter]); /* set the state */ + break; + + default: + throw_rude_remark(EINVAL, "sd %s, invalid keyword: %s", sd->name, token[parameter]); + } + } + + /* Check we have a drive name */ + if (sd->driveno < 0) { /* didn't specify a drive */ + sd->driveno = current_drive; /* set to the current drive */ + if (sd->driveno < 0) /* no current drive? */ + throw_rude_remark(EINVAL, "Subdisk %s is not associated with a drive", sd->name); + } + /* Check for a plex name */ + if ((sd->plexno < 0) /* didn't specify a plex */ + &&(!detached)) /* and didn't say not to, */ + sd->plexno = current_plex; /* set to the current plex */ + + if (sd->plexno >= 0) + sdindex = give_sd_to_plex(sd->plexno, sdno); /* now tell the plex that it has this sd */ + + sd->sdno = sdno; /* point to our entry in the table */ + + /* Does the subdisk have a name? If not, give it one */ + if (sd->name[0] == '\0') { /* no name */ + char sdsuffix[8]; /* form sd name suffix here */ + + /* Do we have a plex name? */ + if (sdindex >= 0) /* we have a plex */ + strcpy(sd->name, PLEX[sd->plexno].name); /* take it from there */ + else /* no way */ + throw_rude_remark(EINVAL, "Unnamed sd is not associated with a plex"); + sprintf(sdsuffix, ".s%d", sdindex); /* form the suffix */ + strcat(sd->name, sdsuffix); /* and add it to the name */ + } + /* do we have complete info for this subdisk? */ + if (sd->sectors == 0) + throw_rude_remark(EINVAL, "sd %s has no length spec", sd->name); + + if (sd->state == sd_unallocated) /* no state decided, */ + sd->state = sd_init; /* at least we're in the game */ + + /* register the subdisk with the drive. This action + * will have the side effect of setting the offset if + * we haven't specified one, and causing an error + * message if it overlaps with another subdisk. */ + give_sd_to_drive(sdno); +} + +/* Handle a plex definition. + * If we find an error, print a message, deallocate the nascent plex, and return + */ +void +config_plex(void) +{ + BROKEN_GDB; + int parameter; + int plexno; /* index of plex in vinum_conf */ + struct plex *plex; /* and pointer to it */ + int pindex = MAXPLEX; /* index in volume's plex list */ + int detached = 0; /* don't give it to a volume */ + + current_plex = -1; /* forget the previous plex */ + plexno = get_empty_plex(); /* allocate a plex */ + plex = &PLEX[plexno]; /* and point to it */ + plex->plexno = plexno; /* and back to the config */ + for (parameter = 1; parameter < tokens; parameter++) { /* look at the other tokens */ + switch (get_keyword(token[parameter], &keyword_set)) { + case kw_detached: + detached = 1; + break; + + case kw_name: + { + int namedplexno; + + namedplexno = find_plex(token[++parameter], 0); /* find an existing plex with this name */ + if (namedplexno >= 0) + throw_rude_remark(EINVAL, "Duplicate plex %s", token[parameter]); + } + bcopy(token[parameter], /* put in the name */ + plex->name, + min(MAXPLEXNAME, strlen(token[parameter]))); + break; + + case kw_org: /* plex organization */ + switch (get_keyword(token[++parameter], &keyword_set)) { + case kw_concat: + plex->organization = plex_concat; + break; + + case kw_striped: + { + int stripesize = sizespec(token[++parameter]); + + plex->organization = plex_striped; + if (stripesize % DEV_BSIZE != 0) /* not a multiple of block size, */ + throw_rude_remark(EINVAL, "plex %s: stripe size %d not a multiple of sector size", + plex->name, + stripesize); + else + plex->stripesize = stripesize / DEV_BSIZE; + break; + } + + + default: + throw_rude_remark(EINVAL, "Invalid plex organization"); + } + if (((plex->organization == plex_striped) + ) + && (plex->stripesize == 0)) /* didn't specify a valid stripe size */ + throw_rude_remark(EINVAL, "Need a stripe size parameter"); + break; + + case kw_volume: + plex->volno = find_volume(token[++parameter], 1); /* insert a pointer to the volume */ + break; + + case kw_sd: /* add a subdisk */ + { + int sdno; + + sdno = find_subdisk(token[++parameter], 1); /* find a subdisk */ + SD[sdno].plexoffset = sizespec(token[++parameter]); /* get the offset */ + give_sd_to_plex(plexno, sdno); /* and insert it there */ + break; + } + + case kw_state: + checkkernel(token[++parameter]); /* only for kernel use */ + plex->state = PlexState(token[parameter]); /* set the state */ + break; + + default: + throw_rude_remark(EINVAL, "plex %s, invalid keyword: %s", + plex->name, + token[parameter]); + } + } + + if ((plex->volno < 0) /* we don't have a volume */ + &&(!detached)) /* and we wouldn't object */ + plex->volno = current_volume; + + if (plex->volno >= 0) + pindex = give_plex_to_volume(plex->volno, plexno); /* Now tell the volume that it has this plex */ + + /* Does the plex have a name? If not, give it one */ + if (plex->name[0] == '\0') { /* no name */ + char plexsuffix[8]; /* form plex name suffix here */ + /* Do we have a volume name? */ + if (plex->volno >= 0) /* we have a volume */ + strcpy(plex->name, /* take it from there */ + VOL[plex->volno].name); + else /* no way */ + throw_rude_remark(EINVAL, "Unnamed plex is not associated with a volume"); + sprintf(plexsuffix, ".p%d", pindex); /* form the suffix */ + strcat(plex->name, plexsuffix); /* and add it to the name */ + } + /* Note the last plex we configured */ + current_plex = plexno; + if (plex->state == plex_unallocated) /* we haven't changed the state, */ + plex->state = plex_init; /* we're initialized now */ +} + +/* Handle a volume definition. + * If we find an error, print a message, deallocate the nascent volume, and return + */ +void +config_volume(void) +{ + BROKEN_GDB; + int parameter; + int volno; + struct volume *vol; /* collect volume info here */ + int i; + + if (tokens < 2) /* not enough tokens */ + throw_rude_remark(EINVAL, "Volume has no name"); + current_volume = -1; /* forget the previous volume */ + volno = find_volume(token[1], 1); /* allocate a volume to initialize */ + vol = &VOL[volno]; /* and get a pointer */ + + for (parameter = 2; parameter < tokens; parameter++) { /* look at all tokens */ + switch (get_keyword(token[parameter], &keyword_set)) { + case kw_plex: + { + int plexno; /* index of this plex */ + + plexno = find_plex(token[++parameter], 1); /* find a plex */ + if (plexno < 0) /* couldn't */ + break; /* we've already had an error message */ + plexno = my_plex(volno, plexno); /* does it already belong to us? */ + if (plexno > 0) /* yes, shouldn't get it again */ + throw_rude_remark(EINVAL, + "Plex %s already belongs to volume %s", + token[parameter], + vol->name); + else if (++vol->plexes > 8) /* another entry */ + throw_rude_remark(EINVAL, + "Too many plexes for volume %s", + vol->name); + vol->plex[vol->plexes - 1] = plexno; + } + break; + + case kw_readpol: + switch (get_keyword(token[++parameter], &keyword_set)) { /* decide what to do */ + case kw_round: + vol->preferred_plex = ROUND_ROBIN_READPOL; /* default */ + break; + + case kw_prefer: + { + int myplexno; /* index of this plex */ + + myplexno = find_plex(token[++parameter], 1); /* find a plex */ + if (myplexno < 0) /* couldn't */ + break; /* we've already had an error message */ + myplexno = my_plex(volno, myplexno); /* does it already belong to us? */ + if (myplexno > 0) /* yes */ + vol->preferred_plex = myplexno; /* just note the index */ + else if (++vol->plexes > 8) /* another entry */ + throw_rude_remark(EINVAL, "Too many plexes"); + else { /* space for the new plex */ + vol->plex[vol->plexes - 1] = myplexno; /* add it to our list */ + vol->preferred_plex = vol->plexes - 1; /* and note the index */ + } + } + break; + + default: + throw_rude_remark(EINVAL, "Invalid read policy"); + } + + case kw_setupstate: + vol->flags |= VF_CONFIG_SETUPSTATE; /* set the volume up later on */ + break; + + case kw_state: + checkkernel(token[++parameter]); /* must be a kernel user */ + vol->state = VolState(token[parameter]); /* set the state */ + break; + + /* XXX experimental ideas. These are not + * documented, and will not be until I + * decide they're worth keeping */ + case kw_writethrough: /* set writethrough mode */ + vol->flags |= VF_WRITETHROUGH; + break; + + case kw_writeback: /* set writeback mode */ + vol->flags &= ~VF_WRITETHROUGH; + break; + + case kw_raw: + vol->flags |= VF_RAW; /* raw volume (no label) */ + break; + + default: + throw_rude_remark(EINVAL, "volume %s, invalid keyword: %s", + vol->name, + token[parameter]); + } + } + + current_volume = volno; /* note last referred volume */ + vol->devno = VINUMBDEV(volno, 0, 0, VINUM_VOLUME_TYPE); /* also note device number */ + + /* Before we can actually use the volume, we need + * a volume label. We could start to fake one here, + * but it will be a lot easier when we have some + * to copy from the drives, so defer it until we + * set up the configuration. XXX */ + if (vol->state == volume_unallocated) + vol->state = volume_down; /* now ready to bring up at the end */ + + /* Find out how big our volume is */ + for (i = 0; i < vol->plexes; i++) + vol->size = max(vol->size, PLEX[vol->plex[i]].length); +} + +/* Parse a config entry. CARE! This destroys the original contents of the + * config entry, which we don't really need after this. More specifically, it + * places \0 characters at the end of each token. + * + * Return 0 if all is well, otherwise EINVAL */ +int +parse_config(char *cptr, struct keywordset *keyset) +{ + BROKEN_GDB; + int status; + + status = 0; /* until proven otherwise */ + tokens = tokenize(cptr, token); /* chop up into tokens */ + + if (tokens <= 0) /* screwed up or empty line */ + return tokens; /* give up */ + + if (token[0][0] == '#') /* comment line */ + return 0; + + switch (get_keyword(token[0], keyset)) { /* decide what to do */ + case kw_read: /* read config from a specified drive */ + vinum_conf.flags |= VF_KERNELOP | VF_READING_CONFIG; /* kernel operation: reading config */ + status = check_drive(token[1]); /* check the drive info */ + vinum_conf.flags &= ~(VF_KERNELOP | VF_READING_CONFIG); + if (status != 0) { + char *msg = "Can't read configuration from %s"; + if (status == ENODEV) + msg = "No vinum configuration on %s"; + throw_rude_remark(status, msg, token[1]); + } + updateconfig(VF_KERNELOP); /* update from kernel space */ + break; + + case kw_drive: + config_drive(); + break; + + case kw_subdisk: + config_subdisk(); + break; + + case kw_plex: + config_plex(); + break; + + case kw_volume: + config_volume(); + break; + + /* Anything else is invalid in this context */ + default: + throw_rude_remark(EINVAL, /* should we die? */ + "Invalid configuration information: %s", + token[0]); + } + return status; +} + +/* parse a line handed in from userland via ioctl. + * This differs only by the error reporting mechanism: + * we return the error indication in the reply to the + * ioctl, so we need to set a global static pointer in + * this file. This technique works because we have + * ensured that configuration is performed in a single- + * threaded manner */ +int +parse_user_config(char *cptr, struct keywordset *keyset) +{ + BROKEN_GDB; + int status; + + ioctl_reply = (struct _ioctl_reply *) cptr; + status = parse_config(cptr, keyset); + ioctl_reply = NULL; /* don't do this again */ + return status; +} + +/* Remove an object */ +void +remove(struct vinum_ioctl_msg *msg) +{ + struct vinum_ioctl_msg message = *msg; /* make a copy to hand on */ + + ioctl_reply = (struct _ioctl_reply *) msg; /* reinstate the address to reply to */ + ioctl_reply->error = 0; /* no error, */ + ioctl_reply->msg[0] = '\0'; /* no message */ + + switch (message.type) { + case drive_object: + remove_drive_entry(message.index, message.force, message.recurse); + updateconfig(0); + return; + + case sd_object: + remove_sd_entry(message.index, message.force, message.recurse); + updateconfig(0); + return; + + case plex_object: + remove_plex_entry(message.index, message.force, message.recurse); + updateconfig(0); + return; + + case volume_object: + remove_volume_entry(message.index, message.force, message.recurse); + updateconfig(0); + return; + + default: + ioctl_reply->error = EINVAL; + strcpy(ioctl_reply->msg, "Invalid object type"); + } +} + +/* Remove a drive. */ +void +remove_drive_entry(int driveno, int force, int recurse) +{ + struct drive *drive = &DRIVE[driveno]; + + if ((driveno > vinum_conf.drives_used) /* not a valid drive */ + ||(drive->state == drive_unallocated)) { /* or nothing there */ + ioctl_reply->error = EINVAL; + strcpy(ioctl_reply->msg, "No such drive"); + } else if (drive->opencount > 0) { /* we have subdisks */ + if (force) { /* do it at any cost */ + int sdno; + struct vinum_ioctl_msg sdmsg; + + for (sdno = 0; sdno < vinum_conf.subdisks_used; sdno++) { + if ((SD[sdno].state != sd_unallocated) /* subdisk is allocated */ + &&(SD[sdno].driveno == driveno)) { /* and it belongs to this drive */ + sdmsg.type = sd_object; + sdmsg.recurse = 1; + sdmsg.force = force; + remove(&sdmsg); /* remove the subdisk by force */ + } + } + remove_drive(driveno); /* now remove it */ + } else + ioctl_reply->error = EBUSY; /* can't do that */ + } else + remove_drive(driveno); /* just remove it */ +} + +/* remove a subdisk */ +void +remove_sd_entry(int sdno, int force, int recurse) +{ + struct sd *sd = &SD[sdno]; + + if ((sdno > vinum_conf.subdisks_used) /* not a valid sd */ + ||(sd->state == sd_unallocated)) { /* or nothing there */ + ioctl_reply->error = EINVAL; + strcpy(ioctl_reply->msg, "No such subdisk"); + } else if (sd->plexno >= 0) { /* we have a plex */ + if (force) { /* do it at any cost */ + struct plex *plex = &PLEX[sd->plexno]; /* point to our plex */ + int mysdno; + + for (mysdno = 0; /* look for ourselves */ + mysdno < plex->subdisks && &SD[plex->sdnos[mysdno]] != sd; + mysdno++); + if (mysdno == plex->subdisks) /* didn't find it */ + throw_rude_remark(ENOENT, "plex %s does not contain subdisk %s", plex->name, sd->name); + if (mysdno < (plex->subdisks - 1)) /* not the last subdisk */ + bcopy(&plex->sdnos[mysdno + 1], + &plex->sdnos[mysdno], + (plex->subdisks - 1 - mysdno) * sizeof(int)); + plex->subdisks--; + /* removing a subdisk from a striped or + * RAID-5 plex really tears the hell out + * of the structure, and it needs to be + * reinitialized */ + if (plex->organization != plex_concat) /* not concatenated, */ + set_plex_state(plex->plexno, plex_faulty, setstate_force); /* need to reinitialize */ + rebuild_plex_unmappedlist(plex); /* and see what remains */ + free_sd(sdno); + } else + ioctl_reply->error = EBUSY; /* can't do that */ + } else + free_sd(sdno); +} + +/* remove a plex */ +void +remove_plex_entry(int plexno, int force, int recurse) +{ + struct plex *plex = &PLEX[plexno]; + int sdno; + + if ((plexno > vinum_conf.plexes_used) /* not a valid plex */ + ||(plex->state == plex_unallocated)) { /* or nothing there */ + ioctl_reply->error = EINVAL; + strcpy(ioctl_reply->msg, "No such plex"); + } else if (plex->pid) { /* we're open */ + ioctl_reply->error = EBUSY; /* no getting around that */ + return; + } + if (plex->subdisks) { + if (force) { /* do it anyway */ + if (recurse) { /* remove all below */ + for (sdno = 0; sdno < plex->subdisks; sdno++) + free_sd(plex->sdnos[sdno]); /* free all subdisks */ + } else { /* just tear them out */ + for (sdno = 0; sdno < plex->subdisks; sdno++) + SD[plex->sdnos[sdno]].plexno = -1; /* no plex any more */ + } + } else { /* can't do it without force */ + ioctl_reply->error = EBUSY; /* can't do that */ + return; + } + } + if (plex->volno >= 0) { /* we are part of a volume */ + /* XXX This should be more intelligent. We should + * be able to remove a plex as long as the volume + * does not lose any data, which is normally the + * case when it has more than one plex. To do it + * right we must compare the completeness of the + * mapping of all the plexes in the volume */ + if (force) { /* do it at any cost */ + struct volume *vol = &VOL[plex->volno]; + int myplexno; + + for (myplexno = 0; myplexno < vol->plexes; myplexno++) + if (vol->plex[myplexno] == plexno) /* found it */ + break; + if (myplexno == vol->plexes) /* didn't find it. Huh? */ + throw_rude_remark(ENOENT, "volume %s does not contain plex %s", vol->name, plex->name); + if (myplexno < (vol->plexes - 1)) /* not the last plex in the list */ + bcopy(&vol->plex[myplexno + 1], &vol->plex[myplexno], vol->plexes - 1 - myplexno); + vol->plexes--; + } else { + ioctl_reply->error = EBUSY; /* can't do that */ + return; + } + } + free_plex(plexno); +} + +/* remove a volume */ +void +remove_volume_entry(int volno, int force, int recurse) +{ + struct volume *vol = &VOL[volno]; + int plexno; + + if ((volno > vinum_conf.volumes_used) /* not a valid volume */ + ||(vol->state == volume_unallocated)) { /* or nothing there */ + ioctl_reply->error = EINVAL; + strcpy(ioctl_reply->msg, "No such volume"); + } else if (vol->opencount) /* we're open */ + ioctl_reply->error = EBUSY; /* no getting around that */ + else if (vol->plexes) { + if (recurse && force) { /* remove all below */ + struct vinum_ioctl_msg plexmsg; + + plexmsg.type = plex_object; + plexmsg.recurse = 1; + plexmsg.force = force; + for (plexno = 0; plexno < vol->plexes; plexno++) { + plexmsg.index = vol->plex[plexno]; /* plex number */ + remove(&plexmsg); + } + free_volume(volno); + } else + ioctl_reply->error = EBUSY; /* can't do that */ + } else + free_volume(volno); +} + +void +update_sd_config(int sdno, int kernelstate) +{ + if (!kernelstate) + set_sd_state(sdno, sd_up, setstate_configuring | setstate_norecurse); +} + +void +update_plex_config(int plexno, int kernelstate) +{ + int error = 0; + int size; + int sdno; + struct plex *plex = &PLEX[plexno]; + enum plexstate state = plex_up; /* state we want the plex in */ + + /* XXX Insert checks here for sparse plexes and volumes */ + + /* Check that our subdisks make sense. For + * striped and RAID5 plexes, we need at least + * two subdisks, and they must all be the same + * size */ + if (((plex->organization == plex_striped) + ) + && (plex->subdisks < 2)) { + error = 1; + printf("vinum: plex %s does not have at least 2 subdisks\n", plex->name); + if (!kernelstate) + set_plex_state(plexno, plex_down, setstate_force | setstate_configuring | setstate_norecurse); + } + size = 0; + for (sdno = 0; sdno < plex->subdisks; sdno++) { + if (((plex->organization == plex_striped) + ) + && (sdno > 0) + && (SD[plex->sdnos[sdno]].sectors != SD[plex->sdnos[sdno - 1]].sectors)) { + error = 1; + printf("vinum: plex %s must have equal sized subdisks\n", plex->name); + set_plex_state(plexno, plex_down, setstate_force | setstate_configuring | setstate_norecurse); + } + size += SD[plex->sdnos[sdno]].sectors; + } + + if (plex->subdisks) { /* plex has subdisks, calculate size */ + rebuild_plex_unmappedlist(plex); /* rebuild the unmapped list first */ + + plex->length = size; + } else { /* no subdisks, */ + plex->length = 0; /* no size */ + state = plex_down; /* take it down */ + } + if (!(kernelstate || error)) + set_plex_state(plexno, state, setstate_none | setstate_configuring | setstate_norecurse); +} + +void +update_volume_config(int volno, int kernelstate) +{ + struct volume *vol = &VOL[volno]; + struct plex *plex; + int plexno; + + if (vol->state != volume_unallocated) + /* Recalculate the size of the volume */ + { + vol->size = 0; + for (plexno = 0; plexno < vol->plexes; plexno++) { + plex = &PLEX[vol->plex[plexno]]; + vol->size = max(plex->length, vol->size); /* maximum size */ + plex->volplexno = plexno; /* note it in the plex */ + } + } + if (!kernelstate) /* try to bring it up */ + set_volume_state(volno, volume_up, setstate_configuring | setstate_norecurse); +} + +/* Update the global configuration. + * kernelstate is != 0 if we're reading in a config + * from disk. In this case, we don't try to + * bring the devices up, though we will bring + * them down if there's some error which got + * missed when writing to disk. + */ +void +updateconfig(int kernelstate) +{ + BROKEN_GDB; + int sdno; + int plexno; + int volno; + struct volume *vol; + struct plex *plex; + + for (sdno = 0; sdno < vinum_conf.subdisks_used; sdno++) + update_sd_config(sdno, kernelstate); + + for (plexno = 0; plexno < vinum_conf.plexes_used; plexno++) + update_plex_config(plexno, kernelstate); + + for (volno = 0; volno < vinum_conf.volumes_used; volno++) + update_volume_config(volno, kernelstate); + save_config(); +} + +/* Start manual changes to the configuration and lock out + * others who may wish to do so. + * XXX why do we need this and lock_config too? */ +int +start_config(void) +{ + int error; + + while ((vinum_conf.flags & VF_CONFIGURING) != 0) { + vinum_conf.flags |= VF_WILL_CONFIGURE; + if ((error = tsleep(&vinum_conf, PRIBIO | PCATCH, "vincfg", 0)) != 0) + return error; + } + /* We need two flags here: VF_CONFIGURING + * tells other processes to hold off (this + * function), and VF_CONFIG_INCOMPLETE + * tells the state change routines not to + * propagate incrememntal state changes */ + vinum_conf.flags |= VF_CONFIGURING | VF_CONFIG_INCOMPLETE; + current_drive = -1; /* reset the defaults */ + current_plex = -1; /* and the same for the last plex */ + current_volume = -1; /* and the last volme */ + return 0; +} + +/* Update the config if update is 1, and unlock + * it. We won't update the configuration if we + * are called in a recursive loop via throw_rude_remark. + */ +void +finish_config(int update) +{ + vinum_conf.flags &= ~VF_CONFIG_INCOMPLETE; /* we've finished our config */ + if (update) + updateconfig(0); /* so update things */ + else + updateconfig(1); /* do some updates only */ + vinum_conf.flags &= ~VF_CONFIGURING; /* and now other people can take a turn */ + if ((vinum_conf.flags & VF_WILL_CONFIGURE) != 0) { + vinum_conf.flags &= ~VF_WILL_CONFIGURE; + wakeup(&vinum_conf); + } +} |