2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
5 * can do whatever you want with this stuff. If we meet some day, and you think
6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
7 * ----------------------------------------------------------------------------
9 * $FreeBSD: src/sys/kern/subr_disk.c,v 1.20.2.6 2001/10/05 07:14:57 peter Exp $
13 #include <sys/param.h>
14 #include <sys/systm.h>
15 #include <sys/kernel.h>
16 #include <sys/sysctl.h>
20 #include <sys/malloc.h>
21 #include <sys/sysctl.h>
22 #include <machine/md_var.h>
23 #include <sys/ctype.h>
25 static MALLOC_DEFINE(M_DISK, "disk", "disk data");
27 static d_strategy_t diskstrategy;
28 static d_open_t diskopen;
29 static d_close_t diskclose;
30 static d_ioctl_t diskioctl;
31 static d_psize_t diskpsize;
33 static LIST_HEAD(, disk) disklist = LIST_HEAD_INITIALIZER(&disklist);
36 inherit_raw(dev_t pdev, dev_t dev)
38 dev->si_disk = pdev->si_disk;
39 dev->si_drv1 = pdev->si_drv1;
40 dev->si_drv2 = pdev->si_drv2;
41 dev->si_iosize_max = pdev->si_iosize_max;
42 dev->si_bsize_phys = pdev->si_bsize_phys;
43 dev->si_bsize_best = pdev->si_bsize_best;
47 disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto)
51 bzero(dp, sizeof(*dp));
53 dev = makedev(cdevsw->d_maj, 0);
56 proto->d_open = diskopen;
57 proto->d_close = diskclose;
58 proto->d_ioctl = diskioctl;
59 proto->d_strategy = diskstrategy;
60 proto->d_psize = diskpsize;
65 printf("Creating DISK %s%d\n", cdevsw->d_name, unit);
66 dev = make_dev(proto, dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART),
67 UID_ROOT, GID_OPERATOR, 0640, "%s%d", cdevsw->d_name, unit);
71 dp->d_dsflags = flags;
73 LIST_INSERT_HEAD(&disklist, dp, d_list);
78 disk_dumpcheck(dev_t dev, u_int *count, u_int *blkno, u_int *secsize)
89 dl = dsgetlabel(dev, dp->d_slice);
92 *count = Maxmem * (PAGE_SIZE / dl->d_secsize);
93 if (dumplo <= LABELSECTOR ||
94 (dumplo + *count > dl->d_partitions[dkpart(dev)].p_size))
96 boff = dl->d_partitions[dkpart(dev)].p_offset +
97 dp->d_slice->dss_slices[dkslice(dev)].ds_offset;
98 *blkno = boff + dumplo;
99 *secsize = dl->d_secsize;
105 disk_invalidate (struct disk *disk)
108 dsgone(&disk->d_slice);
112 disk_destroy(dev_t dev)
114 LIST_REMOVE(dev->si_disk, d_list);
115 bzero(dev->si_disk, sizeof(*dev->si_disk));
122 disk_enumerate(struct disk *disk)
125 return (LIST_FIRST(&disklist));
127 return (LIST_NEXT(disk, d_list));
131 sysctl_disks(SYSCTL_HANDLER_ARGS)
139 while ((disk = disk_enumerate(disk))) {
141 error = SYSCTL_OUT(req, " ", 1);
147 error = SYSCTL_OUT(req, disk->d_dev->si_name, strlen(disk->d_dev->si_name));
151 error = SYSCTL_OUT(req, "", 1);
155 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD, 0, NULL,
156 sysctl_disks, "A", "names of available disks");
159 * The cdevsw functions
163 diskopen(dev_t dev, int oflags, int devtype, struct proc *p)
170 pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
176 while (dp->d_flags & DISKFLAG_LOCK) {
177 dp->d_flags |= DISKFLAG_WANTED;
178 error = tsleep(dp, PRIBIO | PCATCH, "diskopen", hz);
182 dp->d_flags |= DISKFLAG_LOCK;
184 if (!dsisopen(dp->d_slice)) {
185 if (!pdev->si_iosize_max)
186 pdev->si_iosize_max = dev->si_iosize_max;
187 error = dp->d_devsw->d_open(pdev, oflags, devtype, p);
190 /* Inherit properties from the whole/raw dev_t */
191 inherit_raw(pdev, dev);
196 error = dsopen(dev, devtype, dp->d_dsflags, &dp->d_slice, &dp->d_label);
198 if (!dsisopen(dp->d_slice))
199 dp->d_devsw->d_close(pdev, oflags, devtype, p);
201 dp->d_flags &= ~DISKFLAG_LOCK;
202 if (dp->d_flags & DISKFLAG_WANTED) {
203 dp->d_flags &= ~DISKFLAG_WANTED;
211 diskclose(dev_t dev, int fflag, int devtype, struct proc *p)
218 pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
222 dsclose(dev, devtype, dp->d_slice);
223 if (!dsisopen(dp->d_slice))
224 error = dp->d_devsw->d_close(dp->d_dev, fflag, devtype, p);
229 diskstrategy(struct buf *bp)
234 pdev = dkmodpart(dkmodslice(bp->b_dev, WHOLE_DISK_SLICE), RAW_PART);
236 if (dp != bp->b_dev->si_disk)
237 inherit_raw(pdev, bp->b_dev);
241 bp->b_flags |= B_ERROR;
246 if (dscheck(bp, dp->d_slice) <= 0) {
251 dp->d_devsw->d_strategy(bp);
257 diskioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct proc *p)
263 pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
267 error = dsioctl(dev, cmd, data, fflag, &dp->d_slice);
268 if (error == ENOIOCTL)
269 error = dp->d_devsw->d_ioctl(dev, cmd, data, fflag, p);
279 pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
283 if (dp != dev->si_disk) {
284 dev->si_drv1 = pdev->si_drv1;
285 dev->si_drv2 = pdev->si_drv2;
286 /* XXX: don't set bp->b_dev->si_disk (?) */
288 return (dssize(dev, &dp->d_slice));
291 SYSCTL_DECL(_debug_sizeof);
293 SYSCTL_INT(_debug_sizeof, OID_AUTO, disklabel, CTLFLAG_RD,
294 0, sizeof(struct disklabel), "sizeof(struct disklabel)");
296 SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD,
297 0, sizeof(struct diskslices), "sizeof(struct diskslices)");
299 SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD,
300 0, sizeof(struct disk), "sizeof(struct disk)");