* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <sys/time.h>
#include <mach/mach_types.h>
#include <mach/vm_prot.h>
#include <vm/vm_kern.h>
+#include <sys/stat.h>
#include <vm/vm_map.h>
#include <sys/systm.h>
+#include <kern/assert.h>
#include <sys/conf.h>
#include <sys/proc_internal.h>
-#include <sys/buf.h> /* for SET */
+#include <sys/buf.h> /* for SET */
+#include <sys/kernel.h>
#include <sys/user.h>
#include <sys/sysent.h>
#include <sys/sysproto.h>
/* XXX these should be in a common header somwhere, but aren't */
extern int chrtoblk_set(int, int);
-extern vm_offset_t kmem_mb_alloc(vm_map_t, int);
+extern vm_offset_t kmem_mb_alloc(vm_map_t, int, int);
/* XXX most of these just exist to export; there's no good header for them*/
-void pcb_synch(void);
-int issingleuser(void);
-void tbeproc(void *);
+void pcb_synch(void);
+TAILQ_HEAD(, devsw_lock) devsw_locks;
+lck_mtx_t devsw_lock_list_mtx;
+lck_grp_t * devsw_lock_grp;
/* Just to satisfy pstat command */
-int dmmin, dmmax, dmtext;
+int dmmin, dmmax, dmtext;
vm_offset_t
-kmem_mb_alloc(vm_map_t mbmap, int size)
+kmem_mb_alloc(vm_map_t mbmap, int size, int physContig)
{
- vm_offset_t addr;
- if (kernel_memory_allocate(mbmap, &addr, size,
- 0,
- KMA_NOPAGEWAIT|KMA_KOBJECT|KMA_LOMEM) == KERN_SUCCESS)
- return(addr);
+ vm_offset_t addr = 0;
+ kern_return_t kr = KERN_SUCCESS;
+
+ if (!physContig)
+ kr = kernel_memory_allocate(mbmap, &addr, size, 0, KMA_NOPAGEWAIT | KMA_KOBJECT | KMA_LOMEM, VM_KERN_MEMORY_MBUF);
else
- return(0);
-
+ kr = kmem_alloc_contig(mbmap, &addr, size, PAGE_MASK, 0xfffff, 0, KMA_NOPAGEWAIT | KMA_KOBJECT | KMA_LOMEM, VM_KERN_MEMORY_MBUF);
+
+ if (kr != KERN_SUCCESS)
+ addr = 0;
+
+ return addr;
}
/*
{
/* Never returns a NULL */
struct uthread * ut;
- struct proc *p;
+ struct proc * p;
thread_t thread = current_thread();
- ut = (struct uthread *)get_bsdthread_info(thread);
- if (ut && (ut->uu_flag & UT_VFORK) && ut->uu_proc) {
+ ut = (struct uthread *)get_bsdthread_info(thread);
+ if (ut && (ut->uu_flag & UT_VFORK) && ut->uu_proc) {
p = ut->uu_proc;
- if ((p->p_lflag & P_LINVFORK) == 0)
+ if ((p->p_lflag & P_LINVFORK) == 0)
panic("returning child proc not under vfork");
- if (p->p_vforkact != (void *)thread)
+ if (p->p_vforkact != (void *)thread)
panic("returning child proc which is not cur_act");
- return(p);
+ return (p);
}
p = (struct proc *)get_bsdtask_info(current_task());
struct bdevsw nobdev = NO_BDEVICE;
struct cdevsw nocdev = NO_CDEVICE;
-/*
+/*
* if index is -1, return a free slot if avaliable
* else see whether the index is free
* return the major number that is free else -1
*
+ * if index is negative, we start
+ * looking for a free slot at the absolute value of index,
+ * instead of starting at 0
*/
int
bdevsw_isfree(int index)
{
- struct bdevsw *devsw;
- if (index == -1) {
- devsw = bdevsw;
- for(index=0; index < nblkdev; index++, devsw++) {
- if(memcmp((char *)devsw,
- (char *)&nobdev,
- sizeof(struct bdevsw)) == 0)
- break;
- }
- } else {
- /* NB: Not used below unless index is in range */
+ struct bdevsw * devsw;
+
+ if (index < 0) {
+ if (index == -1)
+ index = 1; /* start at 1 to avoid collision with volfs (Radar 2842228) */
+ else
+ index = -index; /* start at least this far up in the table */
devsw = &bdevsw[index];
+ for (; index < nblkdev; index++, devsw++) {
+ if (memcmp((char *)devsw, (char *)&nobdev, sizeof(struct bdevsw)) == 0)
+ break;
+ }
}
- if ((index < 0) || (index >= nblkdev) ||
- (memcmp((char *)devsw,
- (char *)&nobdev,
- sizeof(struct bdevsw)) != 0)) {
- return(-1);
+ if (index < 0 || index >= nblkdev)
+ return (-1);
+
+ devsw = &bdevsw[index];
+ if ((memcmp((char *)devsw, (char *)&nobdev, sizeof(struct bdevsw)) != 0)) {
+ return (-1);
}
- return(index);
+ return (index);
}
-/*
+/*
* if index is -1, find a free slot to add
* else see whether the slot is free
* return the major number that is used else -1
+ *
+ * if index is negative, we start
+ * looking for a free slot at the absolute value of index,
+ * instead of starting at 0
*/
int
-bdevsw_add(int index, struct bdevsw * bsw)
+bdevsw_add(int index, struct bdevsw * bsw)
{
- struct bdevsw *devsw;
-
- if (index == -1) {
- devsw = &bdevsw[1]; /* Start at slot 1 - this is a hack to fix the index=1 hack */
- /* yes, start at 1 to avoid collision with volfs (Radar 2842228) */
- for(index=1; index < nblkdev; index++, devsw++) {
- if(memcmp((char *)devsw,
- (char *)&nobdev,
- sizeof(struct bdevsw)) == 0)
- break;
- }
- }
- devsw = &bdevsw[index];
- if ((index < 0) || (index >= nblkdev) ||
- (memcmp((char *)devsw,
- (char *)&nobdev,
- sizeof(struct bdevsw)) != 0)) {
- return(-1);
+ lck_mtx_lock_spin(&devsw_lock_list_mtx);
+ index = bdevsw_isfree(index);
+ if (index < 0) {
+ index = -1;
+ } else {
+ bdevsw[index] = *bsw;
}
- bdevsw[index] = *bsw;
- return(index);
+ lck_mtx_unlock(&devsw_lock_list_mtx);
+ return (index);
}
-/*
+/*
* if the slot has the same bsw, then remove
* else -1
*/
int
-bdevsw_remove(int index, struct bdevsw * bsw)
+bdevsw_remove(int index, struct bdevsw * bsw)
{
- struct bdevsw *devsw;
+ struct bdevsw * devsw;
+
+ if (index < 0 || index >= nblkdev)
+ return (-1);
devsw = &bdevsw[index];
- if ((index < 0) || (index >= nblkdev) ||
- (memcmp((char *)devsw,
- (char *)bsw,
- sizeof(struct bdevsw)) != 0)) {
- return(-1);
+ lck_mtx_lock_spin(&devsw_lock_list_mtx);
+ if ((memcmp((char *)devsw, (char *)bsw, sizeof(struct bdevsw)) != 0)) {
+ index = -1;
+ } else {
+ bdevsw[index] = nobdev;
}
- bdevsw[index] = nobdev;
- return(index);
+ lck_mtx_unlock(&devsw_lock_list_mtx);
+ return (index);
}
-/*
+/*
* if index is -1, return a free slot if avaliable
* else see whether the index is free
* return the major number that is free else -1
+ *
+ * if index is negative, we start
+ * looking for a free slot at the absolute value of index,
+ * instead of starting at 0
*/
int
cdevsw_isfree(int index)
{
- struct cdevsw *devsw;
-
- if (index == -1) {
- devsw = cdevsw;
- for(index=0; index < nchrdev; index++, devsw++) {
- if(memcmp((char *)devsw,
- (char *)&nocdev,
- sizeof(struct cdevsw)) == 0)
- break;
- }
+ struct cdevsw * devsw;
+
+ if (index < 0) {
+ if (index == -1)
+ index = 0;
+ else
+ index = -index; /* start at least this far up in the table */
+ devsw = &cdevsw[index];
+ for (; index < nchrdev; index++, devsw++) {
+ if (memcmp((char *)devsw, (char *)&nocdev, sizeof(struct cdevsw)) == 0)
+ break;
+ }
}
+
+ if (index < 0 || index >= nchrdev)
+ return (-1);
+
devsw = &cdevsw[index];
- if ((index < 0) || (index >= nchrdev) ||
- (memcmp((char *)devsw,
- (char *)&nocdev,
- sizeof(struct cdevsw)) != 0)) {
- return(-1);
+ if ((memcmp((char *)devsw, (char *)&nocdev, sizeof(struct cdevsw)) != 0)) {
+ return (-1);
}
- return(index);
+ return (index);
}
-/*
+/*
* if index is -1, find a free slot to add
* else see whether the slot is free
* return the major number that is used else -1
*
+ * if index is negative, we start
+ * looking for a free slot at the absolute value of index,
+ * instead of starting at 0
+ *
* NOTE: In practice, -1 is unusable, since there are kernel internal
* devices that call this function with absolute index values,
* which will stomp on free-slot based assignments that happen
- * before them. Therefore, if index is negative, we start
- * looking for a free slot at the absolute value of index,
- * instead of starting at 0 (lets out slot 1, but that's one
- * of the problem slots down low - the vndevice). -12 is
- * currently a safe starting point.
+ * before them. -24 is currently a safe starting point.
*/
int
-cdevsw_add(int index, struct cdevsw * csw)
+cdevsw_add(int index, struct cdevsw * csw)
{
- struct cdevsw *devsw;
-
+ lck_mtx_lock_spin(&devsw_lock_list_mtx);
+ index = cdevsw_isfree(index);
if (index < 0) {
- if (index == -1)
- index = 0; /* historical behaviour; XXX broken */
- else
- index = -index; /* start at least this far up in the table */
- devsw = &cdevsw[index];
- for(; index < nchrdev; index++, devsw++) {
- if(memcmp((char *)devsw,
- (char *)&nocdev,
- sizeof(struct cdevsw)) == 0)
- break;
- }
- }
- devsw = &cdevsw[index];
- if ((index < 0) || (index >= nchrdev) ||
- (memcmp((char *)devsw,
- (char *)&nocdev,
- sizeof(struct cdevsw)) != 0)) {
- return(-1);
+ index = -1;
+ } else {
+ cdevsw[index] = *csw;
}
- cdevsw[index] = *csw;
- return(index);
+ lck_mtx_unlock(&devsw_lock_list_mtx);
+ return (index);
}
/*
- * if the index has the same bsw, then remove
+ * if the slot has the same csw, then remove
* else -1
*/
int
-cdevsw_remove(int index, struct cdevsw * csw)
+cdevsw_remove(int index, struct cdevsw * csw)
{
- struct cdevsw *devsw;
+ struct cdevsw * devsw;
+
+ if (index < 0 || index >= nchrdev)
+ return (-1);
devsw = &cdevsw[index];
- if ((index < 0) || (index >= nchrdev) ||
- (memcmp((char *)devsw,
- (char *)csw,
- sizeof(struct cdevsw)) != 0)) {
- return(-1);
+ lck_mtx_lock_spin(&devsw_lock_list_mtx);
+ if ((memcmp((char *)devsw, (char *)csw, sizeof(struct cdevsw)) != 0)) {
+ index = -1;
+ } else {
+ cdevsw[index] = nocdev;
+ cdevsw_flags[index] = 0;
}
- cdevsw[index] = nocdev;
- return(index);
+ lck_mtx_unlock(&devsw_lock_list_mtx);
+ return (index);
}
static int
return (chrtoblk_set(cdev, bdev));
}
-int
+int
cdevsw_add_with_bdev(int index, struct cdevsw * csw, int bdev)
{
index = cdevsw_add(index, csw);
return (index);
}
-#include <pexpert/pexpert.h> /* for PE_parse_boot_arg */
+int
+cdevsw_setkqueueok(int index, struct cdevsw * csw, int use_offset)
+{
+ struct cdevsw * devsw;
+ uint64_t flags = CDEVSW_SELECT_KQUEUE;
+
+ if (index < 0 || index >= nchrdev)
+ return (-1);
+
+ devsw = &cdevsw[index];
+ if ((memcmp((char *)devsw, (char *)csw, sizeof(struct cdevsw)) != 0)) {
+ return (-1);
+ }
+
+ if (use_offset) {
+ flags |= CDEVSW_USE_OFFSET;
+ }
+
+ cdevsw_flags[index] = flags;
+ return 0;
+}
+
+#include <pexpert/pexpert.h> /* for PE_parse_boot_arg */
/*
- * Notes: This function is used solely by UFS, apparently in an effort
- * to work around an issue with single user mounts.
- *
- * It's not technically correct to reference PE_parse_boot_arg()
- * from this file.
+ * Copy the "hostname" variable into a caller-provided buffer
+ * Returns: 0 for success, ENAMETOOLONG for insufficient buffer space.
+ * On success, "len" will be set to the number of characters preceding
+ * the NULL character in the hostname.
*/
int
-issingleuser(void)
+bsd_hostname(char * buf, int bufsize, int * len)
{
- char namep[16];
-
- if (PE_parse_boot_arg("-s", namep)) {
- return(1);
+ /*
+ * "hostname" is null-terminated, and "hostnamelen" is equivalent to strlen(hostname).
+ */
+ if (hostnamelen < bufsize) {
+ strlcpy(buf, hostname, bufsize);
+ *len = hostnamelen;
+ return 0;
} else {
- return(0);
+ return ENAMETOOLONG;
}
}
void
-tbeproc(void *procp)
+devsw_lock(dev_t dev, int mode)
{
- struct proc *p = procp;
+ devsw_lock_t newlock, tmplock;
+ int res;
+
+ assert(0 <= major(dev) && major(dev) < nchrdev);
+ assert(mode == S_IFCHR || mode == S_IFBLK);
- if (p)
- OSBitOrAtomic(P_TBE, (UInt32 *)&p->p_flag);
- return;
+ MALLOC(newlock, devsw_lock_t, sizeof(struct devsw_lock), M_TEMP, M_WAITOK | M_ZERO);
+ newlock->dl_dev = dev;
+ newlock->dl_thread = current_thread();
+ newlock->dl_mode = mode;
+
+ lck_mtx_lock_spin(&devsw_lock_list_mtx);
+retry:
+ TAILQ_FOREACH(tmplock, &devsw_locks, dl_list)
+ {
+ if (tmplock->dl_dev == dev && tmplock->dl_mode == mode) {
+ res = msleep(tmplock, &devsw_lock_list_mtx, PVFS, "devsw_lock", NULL);
+ assert(res == 0);
+ goto retry;
+ }
+ }
+
+ TAILQ_INSERT_TAIL(&devsw_locks, newlock, dl_list);
+ lck_mtx_unlock(&devsw_lock_list_mtx);
}
+void
+devsw_unlock(dev_t dev, int mode)
+{
+ devsw_lock_t tmplock;
+
+ assert(0 <= major(dev) && major(dev) < nchrdev);
+
+ lck_mtx_lock_spin(&devsw_lock_list_mtx);
+
+ TAILQ_FOREACH(tmplock, &devsw_locks, dl_list)
+ {
+ if (tmplock->dl_dev == dev && tmplock->dl_mode == mode) {
+ break;
+ }
+ }
+
+ if (tmplock == NULL) {
+ panic("Trying to unlock, and couldn't find lock.");
+ }
+ if (tmplock->dl_thread != current_thread()) {
+ panic("Trying to unlock, but I don't hold the lock.");
+ }
+
+ wakeup(tmplock);
+ TAILQ_REMOVE(&devsw_locks, tmplock, dl_list);
+
+ lck_mtx_unlock(&devsw_lock_list_mtx);
+
+ FREE(tmplock, M_TEMP);
+}
+
+void
+devsw_init()
+{
+ devsw_lock_grp = lck_grp_alloc_init("devsw", NULL);
+ assert(devsw_lock_grp != NULL);
+
+ lck_mtx_init(&devsw_lock_list_mtx, devsw_lock_grp, NULL);
+ TAILQ_INIT(&devsw_locks);
+}
projects / apple / xnu.git / blobdiff