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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- /*
- * drive disks
- * used to be just scsi disks, and issued scsi commands directly to the host
- * adapter, but now it just does normal i/o.
- */
- #include "all.h"
- enum { Sectorsz = 512, }; /* usual disk sector size */
- typedef struct Wren Wren;
- struct Wren
- {
- int32_t block; /* size of a block -- from config */
- Devsize nblock; /* number of blocks -- from config */
- int32_t mult; /* multiplier to get physical blocks */
- Devsize max; /* number of logical blocks */
- // char *sddir; /* /dev/sdXX name */
- };
- char *
- dataof(char *file)
- {
- char *datanm;
- Dir *dir;
- dir = dirstat(file);
- if (dir != nil && dir->mode & DMDIR)
- datanm = smprint("%s/data", file);
- else
- datanm = strdup(file);
- free(dir);
- return datanm;
- }
- void
- wreninit(Device *d)
- {
- Wren *dr;
- Dir *dir;
- if(d->private)
- return;
- d->private = dr = malloc(sizeof(Wren));
- if (d->wren.file)
- d->wren.sddata = dataof(d->wren.file);
- else {
- d->wren.sddir = sdof(d);
- d->wren.sddata = smprint("%s/data", d->wren.sddir);
- }
- assert(d->wren.fd <= 0);
- d->wren.fd = open(d->wren.sddata, ORDWR);
- if (d->wren.fd < 0)
- panic("wreninit: can't open %s for %Z: %r", d->wren.sddata, d);
- dr->block = inqsize(d->wren.sddata);
- if(dr->block <= 0 || dr->block >= 16*1024) {
- print("\twreninit %Z block size %ld, setting to %d\n",
- d, dr->block, Sectorsz);
- dr->block = Sectorsz;
- }
- dir = dirfstat(d->wren.fd);
- dr->nblock = dir->length / dr->block;
- free(dir);
- dr->mult = (RBUFSIZE + dr->block - 1) / dr->block;
- dr->max = (dr->nblock + 1) / dr->mult;
- print("\tdisk drive %Z: %,lld %ld-byte sectors, ",
- d, (Wideoff)dr->nblock, dr->block);
- print("%,lld %d-byte blocks\n", (Wideoff)dr->max, RBUFSIZE);
- print("\t\t%ld multiplier\n", dr->mult);
- }
- Devsize
- wrensize(Device *d)
- {
- return ((Wren *)d->private)->max;
- }
- int
- wrenread(Device *d, Off b, void *c)
- {
- int r = 0;
- Wren *dr = d->private;
- if (dr == nil)
- panic("wrenread: no drive (%Z) block %lld", d, (Wideoff)b);
- if(b >= dr->max) {
- print("wrenread: block out of range %Z(%lld)\n", d, (Wideoff)b);
- r = 0x040;
- } else if (pread(d->wren.fd, c, RBUFSIZE, (int64_t)b*RBUFSIZE) != RBUFSIZE) {
- print("wrenread: error on %Z(%lld): %r\n", d, (Wideoff)b);
- cons.nwrenre++;
- r = 1;
- }
- return r;
- }
- int
- wrenwrite(Device *d, Off b, void *c)
- {
- int r = 0;
- Wren *dr = d->private;
- if (dr == nil)
- panic("wrenwrite: no drive (%Z) block %lld", d, (Wideoff)b);
- if(b >= dr->max) {
- print("wrenwrite: block out of range %Z(%lld)\n",
- d, (Wideoff)b);
- r = 0x040;
- } else if (pwrite(d->wren.fd, c, RBUFSIZE, (int64_t)b*RBUFSIZE) != RBUFSIZE) {
- print("wrenwrite: error on %Z(%lld): %r\n", d, (Wideoff)b);
- cons.nwrenwe++;
- r = 1;
- }
- return r;
- }
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