2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Alex Hornung <ahornung@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/param.h>
35 #include <sys/systm.h>
37 #include <sys/kernel.h>
39 #include <sys/fcntl.h>
42 #include <sys/signalvar.h>
43 #include <sys/vnode.h>
45 #include <sys/mount.h>
47 #include <sys/fcntl.h>
48 #include <sys/namei.h>
49 #include <sys/dirent.h>
50 #include <sys/malloc.h>
53 #include <vm/vm_pager.h>
54 #include <vm/vm_zone.h>
55 #include <vm/vm_object.h>
56 #include <sys/filio.h>
57 #include <sys/ttycom.h>
59 #include <sys/devfs.h>
60 #include <sys/pioctl.h>
62 #include <machine/limits.h>
63 #include <vm/vm_page2.h>
65 #include <sys/sysref2.h>
67 MALLOC_DECLARE(M_DEVFS);
68 #define DEVFS_BADOP (void *)devfs_badop
70 static int devfs_badop(struct vop_generic_args *);
71 static int devfs_access(struct vop_access_args *);
72 static int devfs_inactive(struct vop_inactive_args *);
73 static int devfs_reclaim(struct vop_reclaim_args *);
74 static int devfs_readdir(struct vop_readdir_args *);
75 static int devfs_getattr(struct vop_getattr_args *);
76 static int devfs_setattr(struct vop_setattr_args *);
77 static int devfs_readlink(struct vop_readlink_args *);
78 static int devfs_print(struct vop_print_args *);
80 static int devfs_nresolve(struct vop_nresolve_args *);
81 static int devfs_nlookupdotdot(struct vop_nlookupdotdot_args *);
82 static int devfs_nsymlink(struct vop_nsymlink_args *);
83 static int devfs_nremove(struct vop_nremove_args *);
85 static int devfs_spec_open(struct vop_open_args *);
86 static int devfs_spec_close(struct vop_close_args *);
87 static int devfs_spec_fsync(struct vop_fsync_args *);
89 static int devfs_spec_read(struct vop_read_args *);
90 static int devfs_spec_write(struct vop_write_args *);
91 static int devfs_spec_ioctl(struct vop_ioctl_args *);
92 static int devfs_spec_poll(struct vop_poll_args *);
93 static int devfs_spec_kqfilter(struct vop_kqfilter_args *);
94 static int devfs_spec_strategy(struct vop_strategy_args *);
95 static void devfs_spec_strategy_done(struct bio *);
96 static int devfs_spec_freeblks(struct vop_freeblks_args *);
97 static int devfs_spec_bmap(struct vop_bmap_args *);
98 static int devfs_spec_advlock(struct vop_advlock_args *);
99 static void devfs_spec_getpages_iodone(struct bio *);
100 static int devfs_spec_getpages(struct vop_getpages_args *);
103 static int devfs_specf_close(struct file *);
104 static int devfs_specf_read(struct file *, struct uio *, struct ucred *, int);
105 static int devfs_specf_write(struct file *, struct uio *, struct ucred *, int);
106 static int devfs_specf_stat(struct file *, struct stat *, struct ucred *);
107 static int devfs_specf_kqfilter(struct file *, struct knote *);
108 static int devfs_specf_poll(struct file *, int, struct ucred *);
109 static int devfs_specf_ioctl(struct file *, u_long, caddr_t,
110 struct ucred *, struct sysmsg *);
111 static __inline int sequential_heuristic(struct uio *, struct file *);
113 extern struct lock devfs_lock;
116 * devfs vnode operations for regular files
118 struct vop_ops devfs_vnode_norm_vops = {
119 .vop_default = vop_defaultop,
120 .vop_access = devfs_access,
121 .vop_advlock = DEVFS_BADOP,
122 .vop_bmap = DEVFS_BADOP,
123 .vop_close = vop_stdclose,
124 .vop_getattr = devfs_getattr,
125 .vop_inactive = devfs_inactive,
126 .vop_ncreate = DEVFS_BADOP,
127 .vop_nresolve = devfs_nresolve,
128 .vop_nlookupdotdot = devfs_nlookupdotdot,
129 .vop_nlink = DEVFS_BADOP,
130 .vop_nmkdir = DEVFS_BADOP,
131 .vop_nmknod = DEVFS_BADOP,
132 .vop_nremove = devfs_nremove,
133 .vop_nrename = DEVFS_BADOP,
134 .vop_nrmdir = DEVFS_BADOP,
135 .vop_nsymlink = devfs_nsymlink,
136 .vop_open = vop_stdopen,
137 .vop_pathconf = vop_stdpathconf,
138 .vop_print = devfs_print,
139 .vop_read = DEVFS_BADOP,
140 .vop_readdir = devfs_readdir,
141 .vop_readlink = devfs_readlink,
142 .vop_reclaim = devfs_reclaim,
143 .vop_setattr = devfs_setattr,
144 .vop_write = DEVFS_BADOP,
145 .vop_ioctl = DEVFS_BADOP
149 * devfs vnode operations for character devices
151 struct vop_ops devfs_vnode_dev_vops = {
152 .vop_default = vop_defaultop,
153 .vop_access = devfs_access,
154 .vop_advlock = devfs_spec_advlock,
155 .vop_bmap = devfs_spec_bmap,
156 .vop_close = devfs_spec_close,
157 .vop_freeblks = devfs_spec_freeblks,
158 .vop_fsync = devfs_spec_fsync,
159 .vop_getattr = devfs_getattr,
160 .vop_getpages = devfs_spec_getpages,
161 .vop_inactive = devfs_inactive,
162 .vop_open = devfs_spec_open,
163 .vop_pathconf = vop_stdpathconf,
164 .vop_print = devfs_print,
165 .vop_poll = devfs_spec_poll,
166 .vop_kqfilter = devfs_spec_kqfilter,
167 .vop_read = devfs_spec_read,
168 .vop_readdir = DEVFS_BADOP,
169 .vop_readlink = DEVFS_BADOP,
170 .vop_reclaim = devfs_reclaim,
171 .vop_setattr = devfs_setattr,
172 .vop_strategy = devfs_spec_strategy,
173 .vop_write = devfs_spec_write,
174 .vop_ioctl = devfs_spec_ioctl
177 struct vop_ops *devfs_vnode_dev_vops_p = &devfs_vnode_dev_vops;
179 struct fileops devfs_dev_fileops = {
180 .fo_read = devfs_specf_read,
181 .fo_write = devfs_specf_write,
182 .fo_ioctl = devfs_specf_ioctl,
183 .fo_poll = devfs_specf_poll,
184 .fo_kqfilter = devfs_specf_kqfilter,
185 .fo_stat = devfs_specf_stat,
186 .fo_close = devfs_specf_close,
187 .fo_shutdown = nofo_shutdown
191 * These two functions are possibly temporary hacks for
192 * devices (aka the pty code) which want to control the
193 * node attributes themselves.
195 * XXX we may ultimately desire to simply remove the uid/gid/mode
196 * from the node entirely.
199 node_sync_dev_get(struct devfs_node *node)
203 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) {
204 node->uid = dev->si_uid;
205 node->gid = dev->si_gid;
206 node->mode = dev->si_perms;
211 node_sync_dev_set(struct devfs_node *node)
215 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) {
216 dev->si_uid = node->uid;
217 dev->si_gid = node->gid;
218 dev->si_perms = node->mode;
223 * generic entry point for unsupported operations
226 devfs_badop(struct vop_generic_args *ap)
233 devfs_access(struct vop_access_args *ap)
235 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
238 if (!devfs_node_is_accessible(node))
240 node_sync_dev_get(node);
241 error = vop_helper_access(ap, node->uid, node->gid,
242 node->mode, node->flags);
249 devfs_inactive(struct vop_inactive_args *ap)
251 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
253 if (node == NULL || (node->flags & DEVFS_NODE_LINKED) == 0)
260 devfs_reclaim(struct vop_reclaim_args *ap)
262 struct devfs_node *node;
267 * Check if it is locked already. if not, we acquire the devfs lock
269 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) {
270 lockmgr(&devfs_lock, LK_EXCLUSIVE);
277 * Get rid of the devfs_node if it is no longer linked into the
281 if ((node = DEVFS_NODE(vp)) != NULL) {
283 if ((node->flags & DEVFS_NODE_LINKED) == 0)
288 lockmgr(&devfs_lock, LK_RELEASE);
291 * v_rdev needs to be properly released using v_release_rdev
292 * Make sure v_data is NULL as well.
301 devfs_readdir(struct vop_readdir_args *ap)
303 struct devfs_node *dnode = DEVFS_NODE(ap->a_vp);
304 struct devfs_node *node;
313 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_readdir() called!\n");
315 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX)
317 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
320 if (!devfs_node_is_accessible(dnode)) {
325 lockmgr(&devfs_lock, LK_EXCLUSIVE);
327 saveoff = ap->a_uio->uio_offset;
329 if (ap->a_ncookies) {
330 ncookies = ap->a_uio->uio_resid / 16 + 1; /* Why / 16 ?? */
333 cookies = kmalloc(256 * sizeof(off_t), M_TEMP, M_WAITOK);
341 nanotime(&dnode->atime);
344 r = vop_write_dirent(&error, ap->a_uio, dnode->d_dir.d_ino,
349 cookies[cookie_index] = saveoff;
352 if (cookie_index == ncookies)
358 r = vop_write_dirent(&error, ap->a_uio,
359 dnode->parent->d_dir.d_ino,
362 r = vop_write_dirent(&error, ap->a_uio,
369 cookies[cookie_index] = saveoff;
372 if (cookie_index == ncookies)
376 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
377 if ((node->flags & DEVFS_HIDDEN) ||
378 (node->flags & DEVFS_INVISIBLE)) {
383 * If the node type is a valid devfs alias, then we make sure that the
384 * target isn't hidden. If it is, we don't show the link in the
387 if ((node->node_type == Plink) && (node->link_target != NULL) &&
388 (node->link_target->flags & DEVFS_HIDDEN))
391 if (node->cookie < saveoff)
394 saveoff = node->cookie;
396 error2 = vop_write_dirent(&error, ap->a_uio, node->d_dir.d_ino,
398 node->d_dir.d_namlen,
407 cookies[cookie_index] = node->cookie;
409 if (cookie_index == ncookies)
414 lockmgr(&devfs_lock, LK_RELEASE);
417 ap->a_uio->uio_offset = saveoff;
418 if (error && cookie_index == 0) {
420 kfree(cookies, M_TEMP);
422 *ap->a_cookies = NULL;
426 *ap->a_ncookies = cookie_index;
427 *ap->a_cookies = cookies;
435 devfs_nresolve(struct vop_nresolve_args *ap)
437 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
438 struct devfs_node *node, *found = NULL;
439 struct namecache *ncp;
440 struct vnode *vp = NULL;
445 ncp = ap->a_nch->ncp;
448 if (!devfs_node_is_accessible(dnode))
451 lockmgr(&devfs_lock, LK_EXCLUSIVE);
453 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) {
455 cache_setvp(ap->a_nch, NULL);
459 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
460 if (len == node->d_dir.d_namlen) {
461 if (!memcmp(ncp->nc_name, node->d_dir.d_name, len)) {
470 while ((found->node_type == Plink) && (found->link_target)) {
472 devfs_debug(DEVFS_DEBUG_SHOW, "Recursive link or depth >= 8");
476 found = found->link_target;
480 if (!(found->flags & DEVFS_HIDDEN))
481 devfs_allocv(/*ap->a_dvp->v_mount, */ &vp, found);
486 cache_setvp(ap->a_nch, NULL);
492 cache_setvp(ap->a_nch, vp);
495 lockmgr(&devfs_lock, LK_RELEASE);
502 devfs_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
504 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
507 if (!devfs_node_is_accessible(dnode))
510 lockmgr(&devfs_lock, LK_EXCLUSIVE);
511 if (dnode->parent != NULL) {
512 devfs_allocv(ap->a_vpp, dnode->parent);
513 vn_unlock(*ap->a_vpp);
515 lockmgr(&devfs_lock, LK_RELEASE);
517 return ((*ap->a_vpp == NULL) ? ENOENT : 0);
522 devfs_getattr(struct vop_getattr_args *ap)
524 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
525 struct vattr *vap = ap->a_vap;
529 if (!devfs_node_is_accessible(node))
532 node_sync_dev_get(node);
534 lockmgr(&devfs_lock, LK_EXCLUSIVE);
536 /* start by zeroing out the attributes */
539 /* next do all the common fields */
540 vap->va_type = ap->a_vp->v_type;
541 vap->va_mode = node->mode;
542 vap->va_fileid = DEVFS_NODE(ap->a_vp)->d_dir.d_ino ;
543 vap->va_flags = 0; /* XXX: what should this be? */
544 vap->va_blocksize = DEV_BSIZE;
545 vap->va_bytes = vap->va_size = sizeof(struct devfs_node);
547 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
549 vap->va_atime = node->atime;
550 vap->va_mtime = node->mtime;
551 vap->va_ctime = node->ctime;
553 vap->va_nlink = 1; /* number of references to file */
555 vap->va_uid = node->uid;
556 vap->va_gid = node->gid;
561 if ((node->node_type == Pdev) && node->d_dev) {
562 reference_dev(node->d_dev);
563 vap->va_rminor = node->d_dev->si_uminor;
564 release_dev(node->d_dev);
567 /* For a softlink the va_size is the length of the softlink */
568 if (node->symlink_name != 0) {
569 vap->va_size = node->symlink_namelen;
571 lockmgr(&devfs_lock, LK_RELEASE);
578 devfs_setattr(struct vop_setattr_args *ap)
580 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
584 if (!devfs_node_is_accessible(node))
586 node_sync_dev_get(node);
588 lockmgr(&devfs_lock, LK_EXCLUSIVE);
592 if (vap->va_uid != (uid_t)VNOVAL) {
593 if ((ap->a_cred->cr_uid != node->uid) &&
594 (!groupmember(node->gid, ap->a_cred))) {
595 error = priv_check(curthread, PRIV_VFS_CHOWN);
599 node->uid = vap->va_uid;
602 if (vap->va_gid != (uid_t)VNOVAL) {
603 if ((ap->a_cred->cr_uid != node->uid) &&
604 (!groupmember(node->gid, ap->a_cred))) {
605 error = priv_check(curthread, PRIV_VFS_CHOWN);
609 node->gid = vap->va_gid;
612 if (vap->va_mode != (mode_t)VNOVAL) {
613 if (ap->a_cred->cr_uid != node->uid) {
614 error = priv_check(curthread, PRIV_VFS_ADMIN);
618 node->mode = vap->va_mode;
622 node_sync_dev_set(node);
623 nanotime(&node->ctime);
624 lockmgr(&devfs_lock, LK_RELEASE);
631 devfs_readlink(struct vop_readlink_args *ap)
633 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
636 if (!devfs_node_is_accessible(node))
639 lockmgr(&devfs_lock, LK_EXCLUSIVE);
640 ret = uiomove(node->symlink_name, node->symlink_namelen, ap->a_uio);
641 lockmgr(&devfs_lock, LK_RELEASE);
648 devfs_print(struct vop_print_args *ap)
655 devfs_nsymlink(struct vop_nsymlink_args *ap)
657 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
658 struct devfs_node *node;
661 if (!devfs_node_is_accessible(dnode))
664 ap->a_vap->va_type = VLNK;
666 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir))
669 lockmgr(&devfs_lock, LK_EXCLUSIVE);
670 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Plink,
671 ap->a_nch->ncp->nc_name, dnode, NULL);
673 targetlen = strlen(ap->a_target);
675 node = DEVFS_NODE(*ap->a_vpp);
676 node->flags |= DEVFS_USER_CREATED;
677 node->symlink_namelen = targetlen;
678 node->symlink_name = kmalloc(targetlen + 1, M_DEVFS, M_WAITOK);
679 memcpy(node->symlink_name, ap->a_target, targetlen);
680 node->symlink_name[targetlen] = '\0';
681 cache_setunresolved(ap->a_nch);
682 cache_setvp(ap->a_nch, *ap->a_vpp);
684 lockmgr(&devfs_lock, LK_RELEASE);
686 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0);
691 devfs_nremove(struct vop_nremove_args *ap)
693 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
694 struct devfs_node *node;
695 struct namecache *ncp;
698 ncp = ap->a_nch->ncp;
700 if (!devfs_node_is_accessible(dnode))
703 lockmgr(&devfs_lock, LK_EXCLUSIVE);
705 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir))
708 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
709 if (ncp->nc_nlen != node->d_dir.d_namlen)
711 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen))
715 * only allow removal of user created stuff (e.g. symlinks)
717 if ((node->flags & DEVFS_USER_CREATED) == 0) {
722 cache_inval_vp(node->v_node, CINV_DESTROY);
729 cache_setunresolved(ap->a_nch);
730 cache_setvp(ap->a_nch, NULL);
733 lockmgr(&devfs_lock, LK_RELEASE);
739 devfs_spec_open(struct vop_open_args *ap)
741 struct vnode *vp = ap->a_vp;
742 struct vnode *orig_vp = NULL;
743 struct devfs_node *node = DEVFS_NODE(vp);
744 struct devfs_node *newnode;
745 cdev_t dev, ndev = NULL;
749 if (node->d_dev == NULL)
751 if (!devfs_node_is_accessible(node))
755 if ((dev = vp->v_rdev) == NULL)
758 if (node && ap->a_fp) {
759 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_open: -1.1-\n");
760 lockmgr(&devfs_lock, LK_EXCLUSIVE);
762 ndev = devfs_clone(dev, node->d_dir.d_name, node->d_dir.d_namlen,
763 ap->a_mode, ap->a_cred);
765 newnode = devfs_create_device_node(
766 DEVFS_MNTDATA(vp->v_mount)->root_node,
768 /* XXX: possibly destroy device if this happens */
770 if (newnode != NULL) {
774 devfs_debug(DEVFS_DEBUG_DEBUG,
775 "parent here is: %s, node is: |%s|\n",
776 ((node->parent->node_type == Proot) ?
777 "ROOT!" : node->parent->d_dir.d_name),
778 newnode->d_dir.d_name);
779 devfs_debug(DEVFS_DEBUG_DEBUG,
781 ((struct devfs_node *)(TAILQ_LAST(DEVFS_DENODE_HEAD(node->parent), devfs_node_head)))->d_dir.d_name);
784 * orig_vp is set to the original vp if we cloned.
786 /* node->flags |= DEVFS_CLONED; */
787 devfs_allocv(&vp, newnode);
792 lockmgr(&devfs_lock, LK_RELEASE);
795 devfs_debug(DEVFS_DEBUG_DEBUG,
796 "devfs_spec_open() called on %s! \n",
800 * Make this field valid before any I/O in ->d_open
802 if (!dev->si_iosize_max)
803 dev->si_iosize_max = DFLTPHYS;
805 if (dev_dflags(dev) & D_TTY)
806 vp->v_flag |= VISTTY;
809 error = dev_dopen(dev, ap->a_mode, S_IFCHR, ap->a_cred);
810 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
813 * Clean up any cloned vp if we error out.
819 /* orig_vp = NULL; */
825 * This checks if the disk device is going to be opened for writing.
826 * It will be only allowed in the cases where securelevel permits it
827 * and it's not mounted R/W.
829 if ((dev_dflags(dev) & D_DISK) && (ap->a_mode & FWRITE) &&
830 (ap->a_cred != FSCRED)) {
832 /* Very secure mode. No open for writing allowed */
833 if (securelevel >= 2)
837 * If it is mounted R/W, do not allow to open for writing.
838 * In the case it's mounted read-only but securelevel
839 * is >= 1, then do not allow opening for writing either.
841 if (vfs_mountedon(vp)) {
842 if (!(dev->si_mountpoint->mnt_flag & MNT_RDONLY))
844 else if (securelevel >= 1)
849 if (dev_dflags(dev) & D_TTY) {
854 devfs_debug(DEVFS_DEBUG_DEBUG,
855 "devfs: no t_stop\n");
856 tp->t_stop = nottystop;
862 if (vn_isdisk(vp, NULL)) {
863 if (!dev->si_bsize_phys)
864 dev->si_bsize_phys = DEV_BSIZE;
865 vinitvmio(vp, IDX_TO_OFF(INT_MAX));
871 nanotime(&node->atime);
877 /* Ugly pty magic, to make pty devices appear once they are opened */
878 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY)
879 node->flags &= ~DEVFS_INVISIBLE;
882 ap->a_fp->f_type = DTYPE_VNODE;
883 ap->a_fp->f_flag = ap->a_mode & FMASK;
884 ap->a_fp->f_ops = &devfs_dev_fileops;
885 ap->a_fp->f_data = vp;
893 devfs_spec_close(struct vop_close_args *ap)
895 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
896 struct proc *p = curproc;
897 struct vnode *vp = ap->a_vp;
898 cdev_t dev = vp->v_rdev;
902 devfs_debug(DEVFS_DEBUG_DEBUG,
903 "devfs_spec_close() called on %s! \n",
907 * A couple of hacks for devices and tty devices. The
908 * vnode ref count cannot be used to figure out the
909 * last close, but we can use v_opencount now that
910 * revoke works properly.
912 * Detect the last close on a controlling terminal and clear
913 * the session (half-close).
918 if (p && vp->v_opencount <= 1 && vp == p->p_session->s_ttyvp) {
919 p->p_session->s_ttyvp = NULL;
924 * Vnodes can be opened and closed multiple times. Do not really
925 * close the device unless (1) it is being closed forcibly,
926 * (2) the device wants to track closes, or (3) this is the last
927 * vnode doing its last close on the device.
929 * XXX the VXLOCK (force close) case can leave vnodes referencing
930 * a closed device. This might not occur now that our revoke is
933 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -1- \n");
934 if (dev && ((vp->v_flag & VRECLAIMED) ||
935 (dev_dflags(dev) & D_TRACKCLOSE) ||
936 (vp->v_opencount == 1))) {
938 * Unlock around dev_dclose()
941 if (vn_islocked(vp)) {
945 error = dev_dclose(dev, ap->a_fflag, S_IFCHR);
948 * Ugly pty magic, to make pty devices disappear again once
951 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY)
952 node->flags |= DEVFS_INVISIBLE;
955 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
959 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -2- \n");
962 * Track the actual opens and closes on the vnode. The last close
963 * disassociates the rdev. If the rdev is already disassociated or
964 * the opencount is already 0, the vnode might have been revoked
965 * and no further opencount tracking occurs.
969 if (vp->v_opencount > 0)
977 devfs_specf_close(struct file *fp)
979 struct vnode *vp = (struct vnode *)fp->f_data;
983 fp->f_ops = &badfileops;
984 error = vn_close(vp, fp->f_flag);
992 * Device-optimized file table vnode read routine.
994 * This bypasses the VOP table and talks directly to the device. Most
995 * filesystems just route to specfs and can make this optimization.
997 * MPALMOSTSAFE - acquires mplock
1000 devfs_specf_read(struct file *fp, struct uio *uio,
1001 struct ucred *cred, int flags)
1003 struct devfs_node *node;
1010 KASSERT(uio->uio_td == curthread,
1011 ("uio_td %p is not td %p", uio->uio_td, curthread));
1013 vp = (struct vnode *)fp->f_data;
1014 if (vp == NULL || vp->v_type == VBAD) {
1018 node = DEVFS_NODE(vp);
1020 if ((dev = vp->v_rdev) == NULL) {
1027 if (uio->uio_resid == 0) {
1031 if ((flags & O_FOFFSET) == 0)
1032 uio->uio_offset = fp->f_offset;
1035 if (flags & O_FBLOCKING) {
1036 /* ioflag &= ~IO_NDELAY; */
1037 } else if (flags & O_FNONBLOCKING) {
1038 ioflag |= IO_NDELAY;
1039 } else if (fp->f_flag & FNONBLOCK) {
1040 ioflag |= IO_NDELAY;
1042 if (flags & O_FBUFFERED) {
1043 /* ioflag &= ~IO_DIRECT; */
1044 } else if (flags & O_FUNBUFFERED) {
1045 ioflag |= IO_DIRECT;
1046 } else if (fp->f_flag & O_DIRECT) {
1047 ioflag |= IO_DIRECT;
1049 ioflag |= sequential_heuristic(uio, fp);
1051 error = dev_dread(dev, uio, ioflag);
1055 nanotime(&node->atime);
1056 if ((flags & O_FOFFSET) == 0)
1057 fp->f_offset = uio->uio_offset;
1058 fp->f_nextoff = uio->uio_offset;
1066 devfs_specf_write(struct file *fp, struct uio *uio,
1067 struct ucred *cred, int flags)
1069 struct devfs_node *node;
1076 KASSERT(uio->uio_td == curthread,
1077 ("uio_td %p is not p %p", uio->uio_td, curthread));
1079 vp = (struct vnode *)fp->f_data;
1080 if (vp == NULL || vp->v_type == VBAD) {
1084 node = DEVFS_NODE(vp);
1085 if (vp->v_type == VREG)
1086 bwillwrite(uio->uio_resid);
1087 vp = (struct vnode *)fp->f_data;
1089 if ((dev = vp->v_rdev) == NULL) {
1095 if ((flags & O_FOFFSET) == 0)
1096 uio->uio_offset = fp->f_offset;
1099 if (vp->v_type == VREG &&
1100 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) {
1101 ioflag |= IO_APPEND;
1104 if (flags & O_FBLOCKING) {
1105 /* ioflag &= ~IO_NDELAY; */
1106 } else if (flags & O_FNONBLOCKING) {
1107 ioflag |= IO_NDELAY;
1108 } else if (fp->f_flag & FNONBLOCK) {
1109 ioflag |= IO_NDELAY;
1111 if (flags & O_FBUFFERED) {
1112 /* ioflag &= ~IO_DIRECT; */
1113 } else if (flags & O_FUNBUFFERED) {
1114 ioflag |= IO_DIRECT;
1115 } else if (fp->f_flag & O_DIRECT) {
1116 ioflag |= IO_DIRECT;
1118 if (flags & O_FASYNCWRITE) {
1119 /* ioflag &= ~IO_SYNC; */
1120 } else if (flags & O_FSYNCWRITE) {
1122 } else if (fp->f_flag & O_FSYNC) {
1126 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
1128 ioflag |= sequential_heuristic(uio, fp);
1130 error = dev_dwrite(dev, uio, ioflag);
1134 nanotime(&node->atime);
1135 nanotime(&node->mtime);
1138 if ((flags & O_FOFFSET) == 0)
1139 fp->f_offset = uio->uio_offset;
1140 fp->f_nextoff = uio->uio_offset;
1148 devfs_specf_stat(struct file *fp, struct stat *sb, struct ucred *cred)
1154 vp = (struct vnode *)fp->f_data;
1155 error = vn_stat(vp, sb, cred);
1167 error = VOP_GETATTR(vp, vap);
1174 * Zero the spare stat fields
1180 * Copy from vattr table ... or not in case it's a cloned device
1182 if (vap->va_fsid != VNOVAL)
1183 sb->st_dev = vap->va_fsid;
1185 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
1187 sb->st_ino = vap->va_fileid;
1189 mode = vap->va_mode;
1193 if (vap->va_nlink > (nlink_t)-1)
1194 sb->st_nlink = (nlink_t)-1;
1196 sb->st_nlink = vap->va_nlink;
1197 sb->st_uid = vap->va_uid;
1198 sb->st_gid = vap->va_gid;
1199 sb->st_rdev = dev2udev(DEVFS_NODE(vp)->d_dev);
1200 sb->st_size = vap->va_size;
1201 sb->st_atimespec = vap->va_atime;
1202 sb->st_mtimespec = vap->va_mtime;
1203 sb->st_ctimespec = vap->va_ctime;
1206 * A VCHR and VBLK device may track the last access and last modified
1207 * time independantly of the filesystem. This is particularly true
1208 * because device read and write calls may bypass the filesystem.
1210 if (vp->v_type == VCHR || vp->v_type == VBLK) {
1213 if (dev->si_lastread) {
1214 sb->st_atimespec.tv_sec = dev->si_lastread;
1215 sb->st_atimespec.tv_nsec = 0;
1217 if (dev->si_lastwrite) {
1218 sb->st_atimespec.tv_sec = dev->si_lastwrite;
1219 sb->st_atimespec.tv_nsec = 0;
1225 * According to www.opengroup.org, the meaning of st_blksize is
1226 * "a filesystem-specific preferred I/O block size for this
1227 * object. In some filesystem types, this may vary from file
1229 * Default to PAGE_SIZE after much discussion.
1232 sb->st_blksize = PAGE_SIZE;
1234 sb->st_flags = vap->va_flags;
1236 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0);
1240 sb->st_gen = (u_int32_t)vap->va_gen;
1242 sb->st_blocks = vap->va_bytes / S_BLKSIZE;
1243 sb->st_fsmid = vap->va_fsmid;
1251 devfs_specf_kqfilter(struct file *fp, struct knote *kn)
1259 vp = (struct vnode *)fp->f_data;
1260 if (vp == NULL || vp->v_type == VBAD) {
1264 if ((dev = vp->v_rdev) == NULL) {
1270 error = dev_dkqfilter(dev, kn);
1281 devfs_specf_poll(struct file *fp, int events, struct ucred *cred)
1283 struct devfs_node *node;
1290 vp = (struct vnode *)fp->f_data;
1291 if (vp == NULL || vp->v_type == VBAD) {
1295 node = DEVFS_NODE(vp);
1297 if ((dev = vp->v_rdev) == NULL) {
1302 error = dev_dpoll(dev, events);
1308 nanotime(&node->atime);
1317 * MPALMOSTSAFE - acquires mplock
1320 devfs_specf_ioctl(struct file *fp, u_long com, caddr_t data,
1321 struct ucred *ucred, struct sysmsg *msg)
1323 struct devfs_node *node;
1328 struct fiodname_args *name_args;
1333 vp = ((struct vnode *)fp->f_data);
1334 if ((dev = vp->v_rdev) == NULL) {
1335 error = EBADF; /* device was revoked */
1339 node = DEVFS_NODE(vp);
1341 devfs_debug(DEVFS_DEBUG_DEBUG,
1342 "devfs_specf_ioctl() called! for dev %s\n",
1345 if (com == FIODTYPE) {
1346 *(int *)data = dev_dflags(dev) & D_TYPEMASK;
1349 } else if (com == FIODNAME) {
1350 name_args = (struct fiodname_args *)data;
1351 name = dev->si_name;
1352 namlen = strlen(name) + 1;
1354 devfs_debug(DEVFS_DEBUG_DEBUG,
1355 "ioctl, got: FIODNAME for %s\n", name);
1357 if (namlen <= name_args->len)
1358 error = copyout(dev->si_name, name_args->name, namlen);
1362 devfs_debug(DEVFS_DEBUG_DEBUG,
1363 "ioctl stuff: error: %d\n", error);
1367 error = dev_dioctl(dev, com, data, fp->f_flag, ucred, msg);
1371 nanotime(&node->atime);
1372 nanotime(&node->mtime);
1376 if (com == TIOCSCTTY) {
1377 devfs_debug(DEVFS_DEBUG_DEBUG,
1378 "devfs_specf_ioctl: got TIOCSCTTY on %s\n",
1381 if (error == 0 && com == TIOCSCTTY) {
1382 struct proc *p = curthread->td_proc;
1383 struct session *sess;
1385 devfs_debug(DEVFS_DEBUG_DEBUG,
1386 "devfs_specf_ioctl: dealing with TIOCSCTTY on %s\n",
1392 sess = p->p_session;
1395 * Do nothing if reassigning same control tty
1397 if (sess->s_ttyvp == vp) {
1403 * Get rid of reference to old control tty
1405 ovp = sess->s_ttyvp;
1414 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_specf_ioctl() finished! \n");
1420 devfs_spec_fsync(struct vop_fsync_args *ap)
1422 struct vnode *vp = ap->a_vp;
1425 if (!vn_isdisk(vp, NULL))
1429 * Flush all dirty buffers associated with a block device.
1431 error = vfsync(vp, ap->a_waitfor, 10000, NULL, NULL);
1436 devfs_spec_read(struct vop_read_args *ap)
1438 struct devfs_node *node;
1447 node = DEVFS_NODE(vp);
1449 if (dev == NULL) /* device was revoked */
1451 if (uio->uio_resid == 0)
1455 error = dev_dread(dev, uio, ap->a_ioflag);
1456 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1459 nanotime(&node->atime);
1465 * Vnode op for write
1467 * spec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
1468 * struct ucred *a_cred)
1471 devfs_spec_write(struct vop_write_args *ap)
1473 struct devfs_node *node;
1482 node = DEVFS_NODE(vp);
1484 KKASSERT(uio->uio_segflg != UIO_NOCOPY);
1486 if (dev == NULL) /* device was revoked */
1490 error = dev_dwrite(dev, uio, ap->a_ioflag);
1491 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1494 nanotime(&node->atime);
1495 nanotime(&node->mtime);
1502 * Device ioctl operation.
1504 * spec_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data,
1505 * int a_fflag, struct ucred *a_cred, struct sysmsg *msg)
1508 devfs_spec_ioctl(struct vop_ioctl_args *ap)
1510 struct vnode *vp = ap->a_vp;
1511 struct devfs_node *node;
1514 if ((dev = vp->v_rdev) == NULL)
1515 return (EBADF); /* device was revoked */
1516 node = DEVFS_NODE(vp);
1520 nanotime(&node->atime);
1521 nanotime(&node->mtime);
1525 return (dev_dioctl(dev, ap->a_command, ap->a_data, ap->a_fflag,
1526 ap->a_cred, ap->a_sysmsg));
1530 * spec_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred)
1534 devfs_spec_poll(struct vop_poll_args *ap)
1536 struct vnode *vp = ap->a_vp;
1537 struct devfs_node *node;
1540 if ((dev = vp->v_rdev) == NULL)
1541 return (EBADF); /* device was revoked */
1542 node = DEVFS_NODE(vp);
1546 nanotime(&node->atime);
1549 return (dev_dpoll(dev, ap->a_events));
1553 * spec_kqfilter(struct vnode *a_vp, struct knote *a_kn)
1557 devfs_spec_kqfilter(struct vop_kqfilter_args *ap)
1559 struct vnode *vp = ap->a_vp;
1560 struct devfs_node *node;
1563 if ((dev = vp->v_rdev) == NULL)
1564 return (EBADF); /* device was revoked */
1565 node = DEVFS_NODE(vp);
1569 nanotime(&node->atime);
1572 return (dev_dkqfilter(dev, ap->a_kn));
1576 * Convert a vnode strategy call into a device strategy call. Vnode strategy
1577 * calls are not limited to device DMA limits so we have to deal with the
1580 * spec_strategy(struct vnode *a_vp, struct bio *a_bio)
1583 devfs_spec_strategy(struct vop_strategy_args *ap)
1585 struct bio *bio = ap->a_bio;
1586 struct buf *bp = bio->bio_buf;
1593 if (bp->b_cmd != BUF_CMD_READ && LIST_FIRST(&bp->b_dep) != NULL)
1597 * Collect statistics on synchronous and asynchronous read
1598 * and write counts for disks that have associated filesystems.
1601 KKASSERT(vp->v_rdev != NULL); /* XXX */
1602 if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) {
1603 if (bp->b_cmd == BUF_CMD_READ) {
1604 if (bp->b_flags & BIO_SYNC)
1605 mp->mnt_stat.f_syncreads++;
1607 mp->mnt_stat.f_asyncreads++;
1609 if (bp->b_flags & BIO_SYNC)
1610 mp->mnt_stat.f_syncwrites++;
1612 mp->mnt_stat.f_asyncwrites++;
1617 * Device iosize limitations only apply to read and write. Shortcut
1618 * the I/O if it fits.
1620 if ((maxiosize = vp->v_rdev->si_iosize_max) == 0) {
1621 devfs_debug(DEVFS_DEBUG_DEBUG,
1622 "%s: si_iosize_max not set!\n",
1623 dev_dname(vp->v_rdev));
1624 maxiosize = MAXPHYS;
1626 #if SPEC_CHAIN_DEBUG & 2
1629 if (bp->b_bcount <= maxiosize ||
1630 (bp->b_cmd != BUF_CMD_READ && bp->b_cmd != BUF_CMD_WRITE)) {
1631 dev_dstrategy_chain(vp->v_rdev, bio);
1636 * Clone the buffer and set up an I/O chain to chunk up the I/O.
1638 nbp = kmalloc(sizeof(*bp), M_DEVBUF, M_INTWAIT|M_ZERO);
1642 BUF_LOCK(nbp, LK_EXCLUSIVE);
1645 nbp->b_flags = B_PAGING | (bp->b_flags & B_BNOCLIP);
1646 nbp->b_data = bp->b_data;
1647 nbp->b_bio1.bio_done = devfs_spec_strategy_done;
1648 nbp->b_bio1.bio_offset = bio->bio_offset;
1649 nbp->b_bio1.bio_caller_info1.ptr = bio;
1652 * Start the first transfer
1654 if (vn_isdisk(vp, NULL))
1655 chunksize = vp->v_rdev->si_bsize_phys;
1657 chunksize = DEV_BSIZE;
1658 chunksize = maxiosize / chunksize * chunksize;
1659 #if SPEC_CHAIN_DEBUG & 1
1660 devfs_debug(DEVFS_DEBUG_DEBUG,
1661 "spec_strategy chained I/O chunksize=%d\n",
1664 nbp->b_cmd = bp->b_cmd;
1665 nbp->b_bcount = chunksize;
1666 nbp->b_bufsize = chunksize; /* used to detect a short I/O */
1667 nbp->b_bio1.bio_caller_info2.index = chunksize;
1669 #if SPEC_CHAIN_DEBUG & 1
1670 devfs_debug(DEVFS_DEBUG_DEBUG,
1671 "spec_strategy: chain %p offset %d/%d bcount %d\n",
1672 bp, 0, bp->b_bcount, nbp->b_bcount);
1675 dev_dstrategy(vp->v_rdev, &nbp->b_bio1);
1677 if (DEVFS_NODE(vp)) {
1678 nanotime(&DEVFS_NODE(vp)->atime);
1679 nanotime(&DEVFS_NODE(vp)->mtime);
1686 * Chunked up transfer completion routine - chain transfers until done
1690 devfs_spec_strategy_done(struct bio *nbio)
1692 struct buf *nbp = nbio->bio_buf;
1693 struct bio *bio = nbio->bio_caller_info1.ptr; /* original bio */
1694 struct buf *bp = bio->bio_buf; /* original bp */
1695 int chunksize = nbio->bio_caller_info2.index; /* chunking */
1696 int boffset = nbp->b_data - bp->b_data;
1698 if (nbp->b_flags & B_ERROR) {
1700 * An error terminates the chain, propogate the error back
1701 * to the original bp
1703 bp->b_flags |= B_ERROR;
1704 bp->b_error = nbp->b_error;
1705 bp->b_resid = bp->b_bcount - boffset +
1706 (nbp->b_bcount - nbp->b_resid);
1707 #if SPEC_CHAIN_DEBUG & 1
1708 devfs_debug(DEVFS_DEBUG_DEBUG,
1709 "spec_strategy: chain %p error %d bcount %d/%d\n",
1710 bp, bp->b_error, bp->b_bcount,
1711 bp->b_bcount - bp->b_resid);
1713 kfree(nbp, M_DEVBUF);
1715 } else if (nbp->b_resid) {
1717 * A short read or write terminates the chain
1719 bp->b_error = nbp->b_error;
1720 bp->b_resid = bp->b_bcount - boffset +
1721 (nbp->b_bcount - nbp->b_resid);
1722 #if SPEC_CHAIN_DEBUG & 1
1723 devfs_debug(DEVFS_DEBUG_DEBUG,
1724 "spec_strategy: chain %p short read(1) "
1726 bp, bp->b_bcount - bp->b_resid, bp->b_bcount);
1728 kfree(nbp, M_DEVBUF);
1730 } else if (nbp->b_bcount != nbp->b_bufsize) {
1732 * A short read or write can also occur by truncating b_bcount
1734 #if SPEC_CHAIN_DEBUG & 1
1735 devfs_debug(DEVFS_DEBUG_DEBUG,
1736 "spec_strategy: chain %p short read(2) "
1738 bp, nbp->b_bcount + boffset, bp->b_bcount);
1741 bp->b_bcount = nbp->b_bcount + boffset;
1742 bp->b_resid = nbp->b_resid;
1743 kfree(nbp, M_DEVBUF);
1745 } else if (nbp->b_bcount + boffset == bp->b_bcount) {
1747 * No more data terminates the chain
1749 #if SPEC_CHAIN_DEBUG & 1
1750 devfs_debug(DEVFS_DEBUG_DEBUG,
1751 "spec_strategy: chain %p finished bcount %d\n",
1756 kfree(nbp, M_DEVBUF);
1760 * Continue the chain
1762 boffset += nbp->b_bcount;
1763 nbp->b_data = bp->b_data + boffset;
1764 nbp->b_bcount = bp->b_bcount - boffset;
1765 if (nbp->b_bcount > chunksize)
1766 nbp->b_bcount = chunksize;
1767 nbp->b_bio1.bio_done = devfs_spec_strategy_done;
1768 nbp->b_bio1.bio_offset = bio->bio_offset + boffset;
1770 #if SPEC_CHAIN_DEBUG & 1
1771 devfs_debug(DEVFS_DEBUG_DEBUG,
1772 "spec_strategy: chain %p offset %d/%d bcount %d\n",
1773 bp, boffset, bp->b_bcount, nbp->b_bcount);
1776 dev_dstrategy(nbp->b_vp->v_rdev, &nbp->b_bio1);
1781 * spec_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length)
1784 devfs_spec_freeblks(struct vop_freeblks_args *ap)
1789 * XXX: This assumes that strategy does the deed right away.
1790 * XXX: this may not be TRTTD.
1792 KKASSERT(ap->a_vp->v_rdev != NULL);
1793 if ((dev_dflags(ap->a_vp->v_rdev) & D_CANFREE) == 0)
1795 bp = geteblk(ap->a_length);
1796 bp->b_cmd = BUF_CMD_FREEBLKS;
1797 bp->b_bio1.bio_offset = ap->a_offset;
1798 bp->b_bcount = ap->a_length;
1799 dev_dstrategy(ap->a_vp->v_rdev, &bp->b_bio1);
1804 * Implement degenerate case where the block requested is the block
1805 * returned, and assume that the entire device is contiguous in regards
1806 * to the contiguous block range (runp and runb).
1808 * spec_bmap(struct vnode *a_vp, off_t a_loffset,
1809 * off_t *a_doffsetp, int *a_runp, int *a_runb)
1812 devfs_spec_bmap(struct vop_bmap_args *ap)
1814 if (ap->a_doffsetp != NULL)
1815 *ap->a_doffsetp = ap->a_loffset;
1816 if (ap->a_runp != NULL)
1817 *ap->a_runp = MAXBSIZE;
1818 if (ap->a_runb != NULL) {
1819 if (ap->a_loffset < MAXBSIZE)
1820 *ap->a_runb = (int)ap->a_loffset;
1822 *ap->a_runb = MAXBSIZE;
1829 * Special device advisory byte-level locks.
1831 * spec_advlock(struct vnode *a_vp, caddr_t a_id, int a_op,
1832 * struct flock *a_fl, int a_flags)
1836 devfs_spec_advlock(struct vop_advlock_args *ap)
1838 return ((ap->a_flags & F_POSIX) ? EINVAL : EOPNOTSUPP);
1842 devfs_spec_getpages_iodone(struct bio *bio)
1844 bio->bio_buf->b_cmd = BUF_CMD_DONE;
1845 wakeup(bio->bio_buf);
1849 * spec_getpages() - get pages associated with device vnode.
1851 * Note that spec_read and spec_write do not use the buffer cache, so we
1852 * must fully implement getpages here.
1855 devfs_spec_getpages(struct vop_getpages_args *ap)
1859 int i, pcount, size;
1862 vm_ooffset_t offset;
1863 int toff, nextoff, nread;
1864 struct vnode *vp = ap->a_vp;
1869 pcount = round_page(ap->a_count) / PAGE_SIZE;
1872 * Calculate the offset of the transfer and do sanity check.
1874 offset = IDX_TO_OFF(ap->a_m[0]->pindex) + ap->a_offset;
1877 * Round up physical size for real devices. We cannot round using
1878 * v_mount's block size data because v_mount has nothing to do with
1879 * the device. i.e. it's usually '/dev'. We need the physical block
1880 * size for the device itself.
1882 * We can't use v_rdev->si_mountpoint because it only exists when the
1883 * block device is mounted. However, we can use v_rdev.
1885 if (vn_isdisk(vp, NULL))
1886 blksiz = vp->v_rdev->si_bsize_phys;
1890 size = (ap->a_count + blksiz - 1) & ~(blksiz - 1);
1893 kva = (vm_offset_t)bp->b_data;
1896 * Map the pages to be read into the kva.
1898 pmap_qenter(kva, ap->a_m, pcount);
1900 /* Build a minimal buffer header. */
1901 bp->b_cmd = BUF_CMD_READ;
1902 bp->b_bcount = size;
1904 bp->b_runningbufspace = size;
1906 runningbufspace += bp->b_runningbufspace;
1910 bp->b_bio1.bio_offset = offset;
1911 bp->b_bio1.bio_done = devfs_spec_getpages_iodone;
1913 mycpu->gd_cnt.v_vnodein++;
1914 mycpu->gd_cnt.v_vnodepgsin += pcount;
1917 vn_strategy(ap->a_vp, &bp->b_bio1);
1921 /* We definitely need to be at splbio here. */
1922 while (bp->b_cmd != BUF_CMD_DONE)
1923 tsleep(bp, 0, "spread", 0);
1927 if (bp->b_flags & B_ERROR) {
1929 error = bp->b_error;
1935 * If EOF is encountered we must zero-extend the result in order
1936 * to ensure that the page does not contain garabge. When no
1937 * error occurs, an early EOF is indicated if b_bcount got truncated.
1938 * b_resid is relative to b_bcount and should be 0, but some devices
1939 * might indicate an EOF with b_resid instead of truncating b_bcount.
1941 nread = bp->b_bcount - bp->b_resid;
1942 if (nread < ap->a_count)
1943 bzero((caddr_t)kva + nread, ap->a_count - nread);
1944 pmap_qremove(kva, pcount);
1947 for (i = 0, toff = 0; i < pcount; i++, toff = nextoff) {
1948 nextoff = toff + PAGE_SIZE;
1951 m->flags &= ~PG_ZERO;
1954 * NOTE: vm_page_undirty/clear_dirty etc do not clear the
1955 * pmap modified bit. pmap modified bit should have
1956 * already been cleared.
1958 if (nextoff <= nread) {
1959 m->valid = VM_PAGE_BITS_ALL;
1961 } else if (toff < nread) {
1963 * Since this is a VM request, we have to supply the
1964 * unaligned offset to allow vm_page_set_valid()
1965 * to zero sub-DEV_BSIZE'd portions of the page.
1967 vm_page_set_valid(m, 0, nread - toff);
1968 vm_page_clear_dirty_end_nonincl(m, 0, nread - toff);
1974 if (i != ap->a_reqpage) {
1976 * Just in case someone was asking for this page we
1977 * now tell them that it is ok to use.
1979 if (!error || (m->valid == VM_PAGE_BITS_ALL)) {
1981 if (m->flags & PG_WANTED) {
1982 vm_page_activate(m);
1984 vm_page_deactivate(m);
1993 } else if (m->valid) {
1996 * Since this is a VM request, we need to make the
1997 * entire page presentable by zeroing invalid sections.
1999 if (m->valid != VM_PAGE_BITS_ALL)
2000 vm_page_zero_invalid(m, FALSE);
2004 m = ap->a_m[ap->a_reqpage];
2005 devfs_debug(DEVFS_DEBUG_WARNING,
2006 "spec_getpages:(%s) I/O read failure: (error=%d) bp %p vp %p\n",
2007 devtoname(vp->v_rdev), error, bp, bp->b_vp);
2008 devfs_debug(DEVFS_DEBUG_WARNING,
2009 " size: %d, resid: %d, a_count: %d, valid: 0x%x\n",
2010 size, bp->b_resid, ap->a_count, m->valid);
2011 devfs_debug(DEVFS_DEBUG_WARNING,
2012 " nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n",
2013 nread, ap->a_reqpage, (u_long)m->pindex, pcount);
2015 * Free the buffer header back to the swap buffer pool.
2018 return VM_PAGER_ERROR;
2021 * Free the buffer header back to the swap buffer pool.
2024 if (DEVFS_NODE(ap->a_vp))
2025 nanotime(&DEVFS_NODE(ap->a_vp)->mtime);
2031 sequential_heuristic(struct uio *uio, struct file *fp)
2034 * Sequential heuristic - detect sequential operation
2036 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) ||
2037 uio->uio_offset == fp->f_nextoff) {
2039 * XXX we assume that the filesystem block size is
2040 * the default. Not true, but still gives us a pretty
2041 * good indicator of how sequential the read operations
2044 int tmpseq = fp->f_seqcount;
2046 tmpseq += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE;
2047 if (tmpseq > IO_SEQMAX)
2049 fp->f_seqcount = tmpseq;
2050 return(fp->f_seqcount << IO_SEQSHIFT);
2054 * Not sequential, quick draw-down of seqcount
2056 if (fp->f_seqcount > 1)