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>
54 #include <vm/vm_pager.h>
55 #include <vm/vm_zone.h>
56 #include <vm/vm_object.h>
57 #include <sys/filio.h>
58 #include <sys/ttycom.h>
59 #include <sys/sysref2.h>
61 #include <sys/devfs.h>
62 #include <sys/pioctl.h>
64 #include <machine/limits.h>
66 MALLOC_DECLARE(M_DEVFS);
67 #define DEVFS_BADOP (void *)devfs_badop
69 static int devfs_badop(struct vop_generic_args *);
70 static int devfs_access(struct vop_access_args *);
71 static int devfs_inactive(struct vop_inactive_args *);
72 static int devfs_reclaim(struct vop_reclaim_args *);
73 static int devfs_readdir(struct vop_readdir_args *);
74 static int devfs_getattr(struct vop_getattr_args *);
75 static int devfs_setattr(struct vop_setattr_args *);
76 static int devfs_readlink(struct vop_readlink_args *);
77 static int devfs_print(struct vop_print_args *);
79 static int devfs_nresolve(struct vop_nresolve_args *);
80 static int devfs_nlookupdotdot(struct vop_nlookupdotdot_args *);
81 static int devfs_nsymlink(struct vop_nsymlink_args *);
82 static int devfs_nremove(struct vop_nremove_args *);
84 static int devfs_spec_open(struct vop_open_args *);
85 static int devfs_spec_close(struct vop_close_args *);
86 static int devfs_spec_fsync(struct vop_fsync_args *);
88 static int devfs_spec_read(struct vop_read_args *);
89 static int devfs_spec_write(struct vop_write_args *);
90 static int devfs_spec_ioctl(struct vop_ioctl_args *);
91 static int devfs_spec_poll(struct vop_poll_args *);
92 static int devfs_spec_kqfilter(struct vop_kqfilter_args *);
93 static int devfs_spec_strategy(struct vop_strategy_args *);
94 static void devfs_spec_strategy_done(struct bio *);
95 static int devfs_spec_freeblks(struct vop_freeblks_args *);
96 static int devfs_spec_bmap(struct vop_bmap_args *);
97 static int devfs_spec_advlock(struct vop_advlock_args *);
98 static void devfs_spec_getpages_iodone(struct bio *);
99 static int devfs_spec_getpages(struct vop_getpages_args *);
102 static int devfs_specf_close(struct file *);
103 static int devfs_specf_read(struct file *, struct uio *, struct ucred *, int);
104 static int devfs_specf_write(struct file *, struct uio *, struct ucred *, int);
105 static int devfs_specf_stat(struct file *, struct stat *, struct ucred *);
106 static int devfs_specf_kqfilter(struct file *, struct knote *);
107 static int devfs_specf_poll(struct file *, int, struct ucred *);
108 static int devfs_specf_ioctl(struct file *, u_long, caddr_t, struct ucred *);
111 static __inline int sequential_heuristic(struct uio *, struct file *);
112 extern struct lock devfs_lock;
115 * devfs vnode operations for regular files
117 struct vop_ops devfs_vnode_norm_vops = {
118 .vop_default = vop_defaultop,
119 .vop_access = devfs_access,
120 .vop_advlock = DEVFS_BADOP,
121 .vop_bmap = DEVFS_BADOP,
122 .vop_close = vop_stdclose,
123 .vop_getattr = devfs_getattr,
124 .vop_inactive = devfs_inactive,
125 .vop_ncreate = DEVFS_BADOP,
126 .vop_nresolve = devfs_nresolve,
127 .vop_nlookupdotdot = devfs_nlookupdotdot,
128 .vop_nlink = DEVFS_BADOP,
129 .vop_nmkdir = DEVFS_BADOP,
130 .vop_nmknod = DEVFS_BADOP,
131 .vop_nremove = devfs_nremove,
132 .vop_nrename = DEVFS_BADOP,
133 .vop_nrmdir = DEVFS_BADOP,
134 .vop_nsymlink = devfs_nsymlink,
135 .vop_open = vop_stdopen,
136 .vop_pathconf = vop_stdpathconf,
137 .vop_print = devfs_print,
138 .vop_read = DEVFS_BADOP,
139 .vop_readdir = devfs_readdir,
140 .vop_readlink = devfs_readlink,
141 .vop_reclaim = devfs_reclaim,
142 .vop_setattr = devfs_setattr,
143 .vop_write = DEVFS_BADOP,
144 .vop_ioctl = DEVFS_BADOP
148 * devfs vnode operations for character devices
150 struct vop_ops devfs_vnode_dev_vops = {
151 .vop_default = vop_defaultop,
152 .vop_access = devfs_access,
153 .vop_advlock = devfs_spec_advlock,
154 .vop_bmap = devfs_spec_bmap,
155 .vop_close = devfs_spec_close,
156 .vop_freeblks = devfs_spec_freeblks,
157 .vop_fsync = devfs_spec_fsync,
158 .vop_getattr = devfs_getattr,
159 .vop_getpages = devfs_spec_getpages,
160 .vop_inactive = devfs_inactive,
161 .vop_open = devfs_spec_open,
162 .vop_pathconf = vop_stdpathconf,
163 .vop_print = devfs_print,
164 .vop_poll = devfs_spec_poll,
165 .vop_kqfilter = devfs_spec_kqfilter,
166 .vop_read = devfs_spec_read,
167 .vop_readdir = DEVFS_BADOP,
168 .vop_readlink = DEVFS_BADOP,
169 .vop_reclaim = devfs_reclaim,
170 .vop_setattr = devfs_setattr,
171 .vop_strategy = devfs_spec_strategy,
172 .vop_write = devfs_spec_write,
173 .vop_ioctl = devfs_spec_ioctl
176 struct vop_ops *devfs_vnode_dev_vops_p = &devfs_vnode_dev_vops;
178 struct fileops devfs_dev_fileops = {
179 .fo_read = devfs_specf_read,
180 .fo_write = devfs_specf_write,
181 .fo_ioctl = devfs_specf_ioctl,
182 .fo_poll = devfs_specf_poll,
183 .fo_kqfilter = devfs_specf_kqfilter,
184 .fo_stat = devfs_specf_stat,
185 .fo_close = devfs_specf_close,
186 .fo_shutdown = nofo_shutdown
190 * These two functions are possibly temporary hacks for
191 * devices (aka the pty code) which want to control the
192 * node attributes themselves.
194 * XXX we may ultimately desire to simply remove the uid/gid/mode
195 * from the node entirely.
198 node_sync_dev_get(struct devfs_node *node)
202 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) {
203 node->uid = dev->si_uid;
204 node->gid = dev->si_gid;
205 node->mode = dev->si_perms;
210 node_sync_dev_set(struct devfs_node *node)
214 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) {
215 dev->si_uid = node->uid;
216 dev->si_gid = node->gid;
217 dev->si_perms = node->mode;
222 * generic entry point for unsupported operations
225 devfs_badop(struct vop_generic_args *ap)
232 devfs_access(struct vop_access_args *ap)
234 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
237 if (!devfs_node_is_accessible(node))
239 node_sync_dev_get(node);
240 error = vop_helper_access(ap, node->uid, node->gid,
241 node->mode, node->flags);
248 devfs_inactive(struct vop_inactive_args *ap)
250 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
252 if (node == NULL || (node->flags & DEVFS_NODE_LINKED) == 0)
259 devfs_reclaim(struct vop_reclaim_args *ap)
261 struct devfs_node *node;
266 * Check if it is locked already. if not, we acquire the devfs lock
268 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) {
269 lockmgr(&devfs_lock, LK_EXCLUSIVE);
276 * Get rid of the devfs_node if it is no longer linked into the
280 if ((node = DEVFS_NODE(vp)) != NULL) {
282 if ((node->flags & DEVFS_NODE_LINKED) == 0)
287 lockmgr(&devfs_lock, LK_RELEASE);
290 * v_rdev needs to be properly released using v_release_rdev
291 * Make sure v_data is NULL as well.
300 devfs_readdir(struct vop_readdir_args *ap)
302 struct devfs_node *dnode = DEVFS_NODE(ap->a_vp);
303 struct devfs_node *node;
312 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_readdir() called!\n");
314 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX)
316 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
319 if (!devfs_node_is_accessible(dnode))
322 lockmgr(&devfs_lock, LK_EXCLUSIVE);
324 saveoff = ap->a_uio->uio_offset;
326 if (ap->a_ncookies) {
327 ncookies = ap->a_uio->uio_resid / 16 + 1; /* Why / 16 ?? */
330 cookies = kmalloc(256 * sizeof(off_t), M_TEMP, M_WAITOK);
338 nanotime(&dnode->atime);
341 r = vop_write_dirent(&error, ap->a_uio, dnode->d_dir.d_ino,
346 cookies[cookie_index] = saveoff;
349 if (cookie_index == ncookies)
355 r = vop_write_dirent(&error, ap->a_uio,
356 dnode->parent->d_dir.d_ino,
359 r = vop_write_dirent(&error, ap->a_uio,
366 cookies[cookie_index] = saveoff;
369 if (cookie_index == ncookies)
373 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
374 if ((node->flags & DEVFS_HIDDEN) ||
375 (node->flags & DEVFS_INVISIBLE)) {
380 * If the node type is a valid devfs alias, then we make sure that the
381 * target isn't hidden. If it is, we don't show the link in the
384 if ((node->node_type == Plink) && (node->link_target != NULL) &&
385 (node->link_target->flags & DEVFS_HIDDEN))
388 if (node->cookie < saveoff)
391 saveoff = node->cookie;
393 error2 = vop_write_dirent(&error, ap->a_uio, node->d_dir.d_ino,
395 node->d_dir.d_namlen,
404 cookies[cookie_index] = node->cookie;
406 if (cookie_index == ncookies)
411 lockmgr(&devfs_lock, LK_RELEASE);
414 ap->a_uio->uio_offset = saveoff;
415 if (error && cookie_index == 0) {
417 kfree(cookies, M_TEMP);
419 *ap->a_cookies = NULL;
423 *ap->a_ncookies = cookie_index;
424 *ap->a_cookies = cookies;
432 devfs_nresolve(struct vop_nresolve_args *ap)
434 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
435 struct devfs_node *node, *found = NULL;
436 struct namecache *ncp;
437 struct vnode *vp = NULL;
443 ncp = ap->a_nch->ncp;
446 if (!devfs_node_is_accessible(dnode))
449 lockmgr(&devfs_lock, LK_EXCLUSIVE);
451 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) {
453 cache_setvp(ap->a_nch, NULL);
457 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
458 if (len == node->d_dir.d_namlen) {
459 if (!memcmp(ncp->nc_name, node->d_dir.d_name, len)) {
468 while ((found->node_type == Plink) && (found->link_target)) {
470 devfs_debug(DEVFS_DEBUG_SHOW, "Recursive link or depth >= 8");
474 found = found->link_target;
478 if (!(found->flags & DEVFS_HIDDEN))
479 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 if (dev_dflags(dev) & D_TTY) {
830 devfs_debug(DEVFS_DEBUG_DEBUG,
831 "devfs: no t_stop\n");
832 tp->t_stop = nottystop;
838 if (vn_isdisk(vp, NULL)) {
839 if (!dev->si_bsize_phys)
840 dev->si_bsize_phys = DEV_BSIZE;
841 vinitvmio(vp, IDX_TO_OFF(INT_MAX));
847 nanotime(&node->atime);
853 /* Ugly pty magic, to make pty devices appear once they are opened */
854 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY)
855 node->flags &= ~DEVFS_INVISIBLE;
858 ap->a_fp->f_type = DTYPE_VNODE;
859 ap->a_fp->f_flag = ap->a_mode & FMASK;
860 ap->a_fp->f_ops = &devfs_dev_fileops;
861 ap->a_fp->f_data = vp;
869 devfs_spec_close(struct vop_close_args *ap)
871 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
872 struct proc *p = curproc;
873 struct vnode *vp = ap->a_vp;
874 cdev_t dev = vp->v_rdev;
878 devfs_debug(DEVFS_DEBUG_DEBUG,
879 "devfs_spec_close() called on %s! \n",
883 * A couple of hacks for devices and tty devices. The
884 * vnode ref count cannot be used to figure out the
885 * last close, but we can use v_opencount now that
886 * revoke works properly.
888 * Detect the last close on a controlling terminal and clear
889 * the session (half-close).
894 if (p && vp->v_opencount <= 1 && vp == p->p_session->s_ttyvp) {
895 p->p_session->s_ttyvp = NULL;
900 * Vnodes can be opened and closed multiple times. Do not really
901 * close the device unless (1) it is being closed forcibly,
902 * (2) the device wants to track closes, or (3) this is the last
903 * vnode doing its last close on the device.
905 * XXX the VXLOCK (force close) case can leave vnodes referencing
906 * a closed device. This might not occur now that our revoke is
909 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -1- \n");
910 if (dev && ((vp->v_flag & VRECLAIMED) ||
911 (dev_dflags(dev) & D_TRACKCLOSE) ||
912 (vp->v_opencount == 1))) {
914 * Unlock around dev_dclose()
917 if (vn_islocked(vp)) {
921 error = dev_dclose(dev, ap->a_fflag, S_IFCHR);
924 * Ugly pty magic, to make pty devices disappear again once
927 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY)
928 node->flags |= DEVFS_INVISIBLE;
931 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
935 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -2- \n");
938 * Track the actual opens and closes on the vnode. The last close
939 * disassociates the rdev. If the rdev is already disassociated or
940 * the opencount is already 0, the vnode might have been revoked
941 * and no further opencount tracking occurs.
945 if (vp->v_opencount > 0)
953 devfs_specf_close(struct file *fp)
955 struct vnode *vp = (struct vnode *)fp->f_data;
959 fp->f_ops = &badfileops;
960 error = vn_close(vp, fp->f_flag);
968 * Device-optimized file table vnode read routine.
970 * This bypasses the VOP table and talks directly to the device. Most
971 * filesystems just route to specfs and can make this optimization.
973 * MPALMOSTSAFE - acquires mplock
976 devfs_specf_read(struct file *fp, struct uio *uio,
977 struct ucred *cred, int flags)
979 struct devfs_node *node;
986 KASSERT(uio->uio_td == curthread,
987 ("uio_td %p is not td %p", uio->uio_td, curthread));
989 vp = (struct vnode *)fp->f_data;
990 if (vp == NULL || vp->v_type == VBAD) {
994 node = DEVFS_NODE(vp);
996 if ((dev = vp->v_rdev) == NULL) {
1003 if (uio->uio_resid == 0) {
1007 if ((flags & O_FOFFSET) == 0)
1008 uio->uio_offset = fp->f_offset;
1011 if (flags & O_FBLOCKING) {
1012 /* ioflag &= ~IO_NDELAY; */
1013 } else if (flags & O_FNONBLOCKING) {
1014 ioflag |= IO_NDELAY;
1015 } else if (fp->f_flag & FNONBLOCK) {
1016 ioflag |= IO_NDELAY;
1018 if (flags & O_FBUFFERED) {
1019 /* ioflag &= ~IO_DIRECT; */
1020 } else if (flags & O_FUNBUFFERED) {
1021 ioflag |= IO_DIRECT;
1022 } else if (fp->f_flag & O_DIRECT) {
1023 ioflag |= IO_DIRECT;
1025 ioflag |= sequential_heuristic(uio, fp);
1027 error = dev_dread(dev, uio, ioflag);
1031 nanotime(&node->atime);
1032 if ((flags & O_FOFFSET) == 0)
1033 fp->f_offset = uio->uio_offset;
1034 fp->f_nextoff = uio->uio_offset;
1042 devfs_specf_write(struct file *fp, struct uio *uio,
1043 struct ucred *cred, int flags)
1045 struct devfs_node *node;
1052 KASSERT(uio->uio_td == curthread,
1053 ("uio_td %p is not p %p", uio->uio_td, curthread));
1055 vp = (struct vnode *)fp->f_data;
1056 if (vp == NULL || vp->v_type == VBAD) {
1060 node = DEVFS_NODE(vp);
1061 if (vp->v_type == VREG)
1062 bwillwrite(uio->uio_resid);
1063 vp = (struct vnode *)fp->f_data;
1065 if ((dev = vp->v_rdev) == NULL) {
1071 if ((flags & O_FOFFSET) == 0)
1072 uio->uio_offset = fp->f_offset;
1075 if (vp->v_type == VREG &&
1076 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) {
1077 ioflag |= IO_APPEND;
1080 if (flags & O_FBLOCKING) {
1081 /* ioflag &= ~IO_NDELAY; */
1082 } else if (flags & O_FNONBLOCKING) {
1083 ioflag |= IO_NDELAY;
1084 } else if (fp->f_flag & FNONBLOCK) {
1085 ioflag |= IO_NDELAY;
1087 if (flags & O_FBUFFERED) {
1088 /* ioflag &= ~IO_DIRECT; */
1089 } else if (flags & O_FUNBUFFERED) {
1090 ioflag |= IO_DIRECT;
1091 } else if (fp->f_flag & O_DIRECT) {
1092 ioflag |= IO_DIRECT;
1094 if (flags & O_FASYNCWRITE) {
1095 /* ioflag &= ~IO_SYNC; */
1096 } else if (flags & O_FSYNCWRITE) {
1098 } else if (fp->f_flag & O_FSYNC) {
1102 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
1104 ioflag |= sequential_heuristic(uio, fp);
1106 error = dev_dwrite(dev, uio, ioflag);
1110 nanotime(&node->atime);
1111 nanotime(&node->mtime);
1114 if ((flags & O_FOFFSET) == 0)
1115 fp->f_offset = uio->uio_offset;
1116 fp->f_nextoff = uio->uio_offset;
1124 devfs_specf_stat(struct file *fp, struct stat *sb, struct ucred *cred)
1130 vp = (struct vnode *)fp->f_data;
1131 error = vn_stat(vp, sb, cred);
1143 error = VOP_GETATTR(vp, vap);
1150 * Zero the spare stat fields
1156 * Copy from vattr table ... or not in case it's a cloned device
1158 if (vap->va_fsid != VNOVAL)
1159 sb->st_dev = vap->va_fsid;
1161 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
1163 sb->st_ino = vap->va_fileid;
1165 mode = vap->va_mode;
1169 if (vap->va_nlink > (nlink_t)-1)
1170 sb->st_nlink = (nlink_t)-1;
1172 sb->st_nlink = vap->va_nlink;
1173 sb->st_uid = vap->va_uid;
1174 sb->st_gid = vap->va_gid;
1175 sb->st_rdev = dev2udev(DEVFS_NODE(vp)->d_dev);
1176 sb->st_size = vap->va_size;
1177 sb->st_atimespec = vap->va_atime;
1178 sb->st_mtimespec = vap->va_mtime;
1179 sb->st_ctimespec = vap->va_ctime;
1182 * A VCHR and VBLK device may track the last access and last modified
1183 * time independantly of the filesystem. This is particularly true
1184 * because device read and write calls may bypass the filesystem.
1186 if (vp->v_type == VCHR || vp->v_type == VBLK) {
1189 if (dev->si_lastread) {
1190 sb->st_atimespec.tv_sec = dev->si_lastread;
1191 sb->st_atimespec.tv_nsec = 0;
1193 if (dev->si_lastwrite) {
1194 sb->st_atimespec.tv_sec = dev->si_lastwrite;
1195 sb->st_atimespec.tv_nsec = 0;
1201 * According to www.opengroup.org, the meaning of st_blksize is
1202 * "a filesystem-specific preferred I/O block size for this
1203 * object. In some filesystem types, this may vary from file
1205 * Default to PAGE_SIZE after much discussion.
1208 sb->st_blksize = PAGE_SIZE;
1210 sb->st_flags = vap->va_flags;
1212 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0);
1216 sb->st_gen = (u_int32_t)vap->va_gen;
1218 sb->st_blocks = vap->va_bytes / S_BLKSIZE;
1219 sb->st_fsmid = vap->va_fsmid;
1227 devfs_specf_kqfilter(struct file *fp, struct knote *kn)
1229 struct devfs_node *node;
1236 vp = (struct vnode *)fp->f_data;
1237 if (vp == NULL || vp->v_type == VBAD) {
1241 node = DEVFS_NODE(vp);
1243 if ((dev = vp->v_rdev) == NULL) {
1249 error = dev_dkqfilter(dev, kn);
1260 devfs_specf_poll(struct file *fp, int events, struct ucred *cred)
1262 struct devfs_node *node;
1269 vp = (struct vnode *)fp->f_data;
1270 if (vp == NULL || vp->v_type == VBAD) {
1274 node = DEVFS_NODE(vp);
1276 if ((dev = vp->v_rdev) == NULL) {
1281 error = dev_dpoll(dev, events);
1287 nanotime(&node->atime);
1296 * MPALMOSTSAFE - acquires mplock
1299 devfs_specf_ioctl(struct file *fp, u_long com, caddr_t data, struct ucred *ucred)
1301 struct devfs_node *node;
1306 struct fiodname_args *name_args;
1311 vp = ((struct vnode *)fp->f_data);
1312 if ((dev = vp->v_rdev) == NULL) {
1313 error = EBADF; /* device was revoked */
1317 node = DEVFS_NODE(vp);
1319 devfs_debug(DEVFS_DEBUG_DEBUG,
1320 "devfs_specf_ioctl() called! for dev %s\n",
1323 if (com == FIODTYPE) {
1324 *(int *)data = dev_dflags(dev) & D_TYPEMASK;
1327 } else if (com == FIODNAME) {
1328 name_args = (struct fiodname_args *)data;
1329 name = dev->si_name;
1330 namlen = strlen(name) + 1;
1332 devfs_debug(DEVFS_DEBUG_DEBUG,
1333 "ioctl, got: FIODNAME for %s\n", name);
1335 if (namlen <= name_args->len)
1336 error = copyout(dev->si_name, name_args->name, namlen);
1340 devfs_debug(DEVFS_DEBUG_DEBUG,
1341 "ioctl stuff: error: %d\n", error);
1345 error = dev_dioctl(dev, com, data, fp->f_flag, ucred);
1349 nanotime(&node->atime);
1350 nanotime(&node->mtime);
1354 if (com == TIOCSCTTY) {
1355 devfs_debug(DEVFS_DEBUG_DEBUG,
1356 "devfs_specf_ioctl: got TIOCSCTTY on %s\n",
1359 if (error == 0 && com == TIOCSCTTY) {
1360 struct proc *p = curthread->td_proc;
1361 struct session *sess;
1363 devfs_debug(DEVFS_DEBUG_DEBUG,
1364 "devfs_specf_ioctl: dealing with TIOCSCTTY on %s\n",
1370 sess = p->p_session;
1373 * Do nothing if reassigning same control tty
1375 if (sess->s_ttyvp == vp) {
1381 * Get rid of reference to old control tty
1383 ovp = sess->s_ttyvp;
1392 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_specf_ioctl() finished! \n");
1398 devfs_spec_fsync(struct vop_fsync_args *ap)
1400 struct vnode *vp = ap->a_vp;
1403 if (!vn_isdisk(vp, NULL))
1407 * Flush all dirty buffers associated with a block device.
1409 error = vfsync(vp, ap->a_waitfor, 10000, NULL, NULL);
1414 devfs_spec_read(struct vop_read_args *ap)
1416 struct devfs_node *node;
1425 node = DEVFS_NODE(vp);
1427 if (dev == NULL) /* device was revoked */
1429 if (uio->uio_resid == 0)
1433 error = dev_dread(dev, uio, ap->a_ioflag);
1434 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1437 nanotime(&node->atime);
1443 * Vnode op for write
1445 * spec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
1446 * struct ucred *a_cred)
1449 devfs_spec_write(struct vop_write_args *ap)
1451 struct devfs_node *node;
1460 node = DEVFS_NODE(vp);
1462 KKASSERT(uio->uio_segflg != UIO_NOCOPY);
1464 if (dev == NULL) /* device was revoked */
1468 error = dev_dwrite(dev, uio, ap->a_ioflag);
1469 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1472 nanotime(&node->atime);
1473 nanotime(&node->mtime);
1480 * Device ioctl operation.
1482 * spec_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data,
1483 * int a_fflag, struct ucred *a_cred)
1486 devfs_spec_ioctl(struct vop_ioctl_args *ap)
1488 struct vnode *vp = ap->a_vp;
1489 struct devfs_node *node;
1492 if ((dev = vp->v_rdev) == NULL)
1493 return (EBADF); /* device was revoked */
1494 node = DEVFS_NODE(vp);
1498 nanotime(&node->atime);
1499 nanotime(&node->mtime);
1503 return (dev_dioctl(dev, ap->a_command, ap->a_data,
1504 ap->a_fflag, ap->a_cred));
1508 * spec_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred)
1512 devfs_spec_poll(struct vop_poll_args *ap)
1514 struct vnode *vp = ap->a_vp;
1515 struct devfs_node *node;
1518 if ((dev = vp->v_rdev) == NULL)
1519 return (EBADF); /* device was revoked */
1520 node = DEVFS_NODE(vp);
1524 nanotime(&node->atime);
1527 return (dev_dpoll(dev, ap->a_events));
1531 * spec_kqfilter(struct vnode *a_vp, struct knote *a_kn)
1535 devfs_spec_kqfilter(struct vop_kqfilter_args *ap)
1537 struct vnode *vp = ap->a_vp;
1538 struct devfs_node *node;
1541 if ((dev = vp->v_rdev) == NULL)
1542 return (EBADF); /* device was revoked */
1543 node = DEVFS_NODE(vp);
1547 nanotime(&node->atime);
1550 return (dev_dkqfilter(dev, ap->a_kn));
1554 * Convert a vnode strategy call into a device strategy call. Vnode strategy
1555 * calls are not limited to device DMA limits so we have to deal with the
1558 * spec_strategy(struct vnode *a_vp, struct bio *a_bio)
1561 devfs_spec_strategy(struct vop_strategy_args *ap)
1563 struct bio *bio = ap->a_bio;
1564 struct buf *bp = bio->bio_buf;
1571 if (bp->b_cmd != BUF_CMD_READ && LIST_FIRST(&bp->b_dep) != NULL)
1575 * Collect statistics on synchronous and asynchronous read
1576 * and write counts for disks that have associated filesystems.
1579 KKASSERT(vp->v_rdev != NULL); /* XXX */
1580 if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) {
1581 if (bp->b_cmd == BUF_CMD_READ) {
1582 if (bp->b_flags & BIO_SYNC)
1583 mp->mnt_stat.f_syncreads++;
1585 mp->mnt_stat.f_asyncreads++;
1587 if (bp->b_flags & BIO_SYNC)
1588 mp->mnt_stat.f_syncwrites++;
1590 mp->mnt_stat.f_asyncwrites++;
1595 * Device iosize limitations only apply to read and write. Shortcut
1596 * the I/O if it fits.
1598 if ((maxiosize = vp->v_rdev->si_iosize_max) == 0) {
1599 devfs_debug(DEVFS_DEBUG_DEBUG,
1600 "%s: si_iosize_max not set!\n",
1601 dev_dname(vp->v_rdev));
1602 maxiosize = MAXPHYS;
1604 #if SPEC_CHAIN_DEBUG & 2
1607 if (bp->b_bcount <= maxiosize ||
1608 (bp->b_cmd != BUF_CMD_READ && bp->b_cmd != BUF_CMD_WRITE)) {
1609 dev_dstrategy_chain(vp->v_rdev, bio);
1614 * Clone the buffer and set up an I/O chain to chunk up the I/O.
1616 nbp = kmalloc(sizeof(*bp), M_DEVBUF, M_INTWAIT|M_ZERO);
1620 BUF_LOCK(nbp, LK_EXCLUSIVE);
1623 nbp->b_flags = B_PAGING | (bp->b_flags & B_BNOCLIP);
1624 nbp->b_data = bp->b_data;
1625 nbp->b_bio1.bio_done = devfs_spec_strategy_done;
1626 nbp->b_bio1.bio_offset = bio->bio_offset;
1627 nbp->b_bio1.bio_caller_info1.ptr = bio;
1630 * Start the first transfer
1632 if (vn_isdisk(vp, NULL))
1633 chunksize = vp->v_rdev->si_bsize_phys;
1635 chunksize = DEV_BSIZE;
1636 chunksize = maxiosize / chunksize * chunksize;
1637 #if SPEC_CHAIN_DEBUG & 1
1638 devfs_debug(DEVFS_DEBUG_DEBUG,
1639 "spec_strategy chained I/O chunksize=%d\n",
1642 nbp->b_cmd = bp->b_cmd;
1643 nbp->b_bcount = chunksize;
1644 nbp->b_bufsize = chunksize; /* used to detect a short I/O */
1645 nbp->b_bio1.bio_caller_info2.index = chunksize;
1647 #if SPEC_CHAIN_DEBUG & 1
1648 devfs_debug(DEVFS_DEBUG_DEBUG,
1649 "spec_strategy: chain %p offset %d/%d bcount %d\n",
1650 bp, 0, bp->b_bcount, nbp->b_bcount);
1653 dev_dstrategy(vp->v_rdev, &nbp->b_bio1);
1655 if (DEVFS_NODE(vp)) {
1656 nanotime(&DEVFS_NODE(vp)->atime);
1657 nanotime(&DEVFS_NODE(vp)->mtime);
1664 * Chunked up transfer completion routine - chain transfers until done
1668 devfs_spec_strategy_done(struct bio *nbio)
1670 struct buf *nbp = nbio->bio_buf;
1671 struct bio *bio = nbio->bio_caller_info1.ptr; /* original bio */
1672 struct buf *bp = bio->bio_buf; /* original bp */
1673 int chunksize = nbio->bio_caller_info2.index; /* chunking */
1674 int boffset = nbp->b_data - bp->b_data;
1676 if (nbp->b_flags & B_ERROR) {
1678 * An error terminates the chain, propogate the error back
1679 * to the original bp
1681 bp->b_flags |= B_ERROR;
1682 bp->b_error = nbp->b_error;
1683 bp->b_resid = bp->b_bcount - boffset +
1684 (nbp->b_bcount - nbp->b_resid);
1685 #if SPEC_CHAIN_DEBUG & 1
1686 devfs_debug(DEVFS_DEBUG_DEBUG,
1687 "spec_strategy: chain %p error %d bcount %d/%d\n",
1688 bp, bp->b_error, bp->b_bcount,
1689 bp->b_bcount - bp->b_resid);
1691 kfree(nbp, M_DEVBUF);
1693 } else if (nbp->b_resid) {
1695 * A short read or write terminates the chain
1697 bp->b_error = nbp->b_error;
1698 bp->b_resid = bp->b_bcount - boffset +
1699 (nbp->b_bcount - nbp->b_resid);
1700 #if SPEC_CHAIN_DEBUG & 1
1701 devfs_debug(DEVFS_DEBUG_DEBUG,
1702 "spec_strategy: chain %p short read(1) "
1704 bp, bp->b_bcount - bp->b_resid, bp->b_bcount);
1706 kfree(nbp, M_DEVBUF);
1708 } else if (nbp->b_bcount != nbp->b_bufsize) {
1710 * A short read or write can also occur by truncating b_bcount
1712 #if SPEC_CHAIN_DEBUG & 1
1713 devfs_debug(DEVFS_DEBUG_DEBUG,
1714 "spec_strategy: chain %p short read(2) "
1716 bp, nbp->b_bcount + boffset, bp->b_bcount);
1719 bp->b_bcount = nbp->b_bcount + boffset;
1720 bp->b_resid = nbp->b_resid;
1721 kfree(nbp, M_DEVBUF);
1723 } else if (nbp->b_bcount + boffset == bp->b_bcount) {
1725 * No more data terminates the chain
1727 #if SPEC_CHAIN_DEBUG & 1
1728 devfs_debug(DEVFS_DEBUG_DEBUG,
1729 "spec_strategy: chain %p finished bcount %d\n",
1734 kfree(nbp, M_DEVBUF);
1738 * Continue the chain
1740 boffset += nbp->b_bcount;
1741 nbp->b_data = bp->b_data + boffset;
1742 nbp->b_bcount = bp->b_bcount - boffset;
1743 if (nbp->b_bcount > chunksize)
1744 nbp->b_bcount = chunksize;
1745 nbp->b_bio1.bio_done = devfs_spec_strategy_done;
1746 nbp->b_bio1.bio_offset = bio->bio_offset + boffset;
1748 #if SPEC_CHAIN_DEBUG & 1
1749 devfs_debug(DEVFS_DEBUG_DEBUG,
1750 "spec_strategy: chain %p offset %d/%d bcount %d\n",
1751 bp, boffset, bp->b_bcount, nbp->b_bcount);
1754 dev_dstrategy(nbp->b_vp->v_rdev, &nbp->b_bio1);
1759 * spec_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length)
1762 devfs_spec_freeblks(struct vop_freeblks_args *ap)
1767 * XXX: This assumes that strategy does the deed right away.
1768 * XXX: this may not be TRTTD.
1770 KKASSERT(ap->a_vp->v_rdev != NULL);
1771 if ((dev_dflags(ap->a_vp->v_rdev) & D_CANFREE) == 0)
1773 bp = geteblk(ap->a_length);
1774 bp->b_cmd = BUF_CMD_FREEBLKS;
1775 bp->b_bio1.bio_offset = ap->a_offset;
1776 bp->b_bcount = ap->a_length;
1777 dev_dstrategy(ap->a_vp->v_rdev, &bp->b_bio1);
1782 * Implement degenerate case where the block requested is the block
1783 * returned, and assume that the entire device is contiguous in regards
1784 * to the contiguous block range (runp and runb).
1786 * spec_bmap(struct vnode *a_vp, off_t a_loffset,
1787 * off_t *a_doffsetp, int *a_runp, int *a_runb)
1790 devfs_spec_bmap(struct vop_bmap_args *ap)
1792 if (ap->a_doffsetp != NULL)
1793 *ap->a_doffsetp = ap->a_loffset;
1794 if (ap->a_runp != NULL)
1795 *ap->a_runp = MAXBSIZE;
1796 if (ap->a_runb != NULL) {
1797 if (ap->a_loffset < MAXBSIZE)
1798 *ap->a_runb = (int)ap->a_loffset;
1800 *ap->a_runb = MAXBSIZE;
1807 * Special device advisory byte-level locks.
1809 * spec_advlock(struct vnode *a_vp, caddr_t a_id, int a_op,
1810 * struct flock *a_fl, int a_flags)
1814 devfs_spec_advlock(struct vop_advlock_args *ap)
1816 return ((ap->a_flags & F_POSIX) ? EINVAL : EOPNOTSUPP);
1820 devfs_spec_getpages_iodone(struct bio *bio)
1822 bio->bio_buf->b_cmd = BUF_CMD_DONE;
1823 wakeup(bio->bio_buf);
1827 * spec_getpages() - get pages associated with device vnode.
1829 * Note that spec_read and spec_write do not use the buffer cache, so we
1830 * must fully implement getpages here.
1833 devfs_spec_getpages(struct vop_getpages_args *ap)
1837 int i, pcount, size;
1840 vm_ooffset_t offset;
1841 int toff, nextoff, nread;
1842 struct vnode *vp = ap->a_vp;
1847 pcount = round_page(ap->a_count) / PAGE_SIZE;
1850 * Calculate the offset of the transfer and do sanity check.
1852 offset = IDX_TO_OFF(ap->a_m[0]->pindex) + ap->a_offset;
1855 * Round up physical size for real devices. We cannot round using
1856 * v_mount's block size data because v_mount has nothing to do with
1857 * the device. i.e. it's usually '/dev'. We need the physical block
1858 * size for the device itself.
1860 * We can't use v_rdev->si_mountpoint because it only exists when the
1861 * block device is mounted. However, we can use v_rdev.
1863 if (vn_isdisk(vp, NULL))
1864 blksiz = vp->v_rdev->si_bsize_phys;
1868 size = (ap->a_count + blksiz - 1) & ~(blksiz - 1);
1871 kva = (vm_offset_t)bp->b_data;
1874 * Map the pages to be read into the kva.
1876 pmap_qenter(kva, ap->a_m, pcount);
1878 /* Build a minimal buffer header. */
1879 bp->b_cmd = BUF_CMD_READ;
1880 bp->b_bcount = size;
1882 bp->b_runningbufspace = size;
1884 runningbufspace += bp->b_runningbufspace;
1888 bp->b_bio1.bio_offset = offset;
1889 bp->b_bio1.bio_done = devfs_spec_getpages_iodone;
1891 mycpu->gd_cnt.v_vnodein++;
1892 mycpu->gd_cnt.v_vnodepgsin += pcount;
1895 vn_strategy(ap->a_vp, &bp->b_bio1);
1899 /* We definitely need to be at splbio here. */
1900 while (bp->b_cmd != BUF_CMD_DONE)
1901 tsleep(bp, 0, "spread", 0);
1905 if (bp->b_flags & B_ERROR) {
1907 error = bp->b_error;
1913 * If EOF is encountered we must zero-extend the result in order
1914 * to ensure that the page does not contain garabge. When no
1915 * error occurs, an early EOF is indicated if b_bcount got truncated.
1916 * b_resid is relative to b_bcount and should be 0, but some devices
1917 * might indicate an EOF with b_resid instead of truncating b_bcount.
1919 nread = bp->b_bcount - bp->b_resid;
1920 if (nread < ap->a_count)
1921 bzero((caddr_t)kva + nread, ap->a_count - nread);
1922 pmap_qremove(kva, pcount);
1925 for (i = 0, toff = 0; i < pcount; i++, toff = nextoff) {
1926 nextoff = toff + PAGE_SIZE;
1929 m->flags &= ~PG_ZERO;
1931 if (nextoff <= nread) {
1932 m->valid = VM_PAGE_BITS_ALL;
1934 } else if (toff < nread) {
1936 * Since this is a VM request, we have to supply the
1937 * unaligned offset to allow vm_page_set_validclean()
1938 * to zero sub-DEV_BSIZE'd portions of the page.
1940 vm_page_set_validclean(m, 0, nread - toff);
1946 if (i != ap->a_reqpage) {
1948 * Just in case someone was asking for this page we
1949 * now tell them that it is ok to use.
1951 if (!error || (m->valid == VM_PAGE_BITS_ALL)) {
1953 if (m->flags & PG_WANTED) {
1954 vm_page_activate(m);
1956 vm_page_deactivate(m);
1965 } else if (m->valid) {
1968 * Since this is a VM request, we need to make the
1969 * entire page presentable by zeroing invalid sections.
1971 if (m->valid != VM_PAGE_BITS_ALL)
1972 vm_page_zero_invalid(m, FALSE);
1976 m = ap->a_m[ap->a_reqpage];
1977 devfs_debug(DEVFS_DEBUG_WARNING,
1978 "spec_getpages:(%s) I/O read failure: (error=%d) bp %p vp %p\n",
1979 devtoname(vp->v_rdev), error, bp, bp->b_vp);
1980 devfs_debug(DEVFS_DEBUG_WARNING,
1981 " size: %d, resid: %d, a_count: %d, valid: 0x%x\n",
1982 size, bp->b_resid, ap->a_count, m->valid);
1983 devfs_debug(DEVFS_DEBUG_WARNING,
1984 " nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n",
1985 nread, ap->a_reqpage, (u_long)m->pindex, pcount);
1987 * Free the buffer header back to the swap buffer pool.
1990 return VM_PAGER_ERROR;
1993 * Free the buffer header back to the swap buffer pool.
1996 if (DEVFS_NODE(ap->a_vp))
1997 nanotime(&DEVFS_NODE(ap->a_vp)->mtime);
2003 sequential_heuristic(struct uio *uio, struct file *fp)
2006 * Sequential heuristic - detect sequential operation
2008 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) ||
2009 uio->uio_offset == fp->f_nextoff) {
2011 * XXX we assume that the filesystem block size is
2012 * the default. Not true, but still gives us a pretty
2013 * good indicator of how sequential the read operations
2016 int tmpseq = fp->f_seqcount;
2018 tmpseq += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE;
2019 if (tmpseq > IO_SEQMAX)
2021 fp->f_seqcount = tmpseq;
2022 return(fp->f_seqcount << IO_SEQSHIFT);
2026 * Not sequential, quick draw-down of seqcount
2028 if (fp->f_seqcount > 1)