vfs_subr.c (bcf11e8d0048006ba97cb460a134cc23290428b2) vfs_subr.c (d8b0556c6dcaf4c506039f86af2b52b29524f89e)
1/*-
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.

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105static void v_decr_usecount(struct vnode *);
106static void v_decr_useonly(struct vnode *);
107static void v_upgrade_usecount(struct vnode *);
108static void vfree(struct vnode *);
109static void vnlru_free(int);
110static void vgonel(struct vnode *);
111static void vfs_knllock(void *arg);
112static void vfs_knlunlock(void *arg);
1/*-
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.

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105static void v_decr_usecount(struct vnode *);
106static void v_decr_useonly(struct vnode *);
107static void v_upgrade_usecount(struct vnode *);
108static void vfree(struct vnode *);
109static void vnlru_free(int);
110static void vgonel(struct vnode *);
111static void vfs_knllock(void *arg);
112static void vfs_knlunlock(void *arg);
113static int vfs_knllocked(void *arg);
113static void vfs_knl_assert_locked(void *arg);
114static void vfs_knl_assert_unlocked(void *arg);
114static void destroy_vpollinfo(struct vpollinfo *vi);
115
116/*
117 * Number of vnodes in existence. Increased whenever getnewvnode()
118 * allocates a new vnode, decreased on vdestroy() called on VI_DOOMed
119 * vnode.
120 */
121static unsigned long numvnodes;

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3266{
3267 struct vpollinfo *vi;
3268
3269 if (vp->v_pollinfo != NULL)
3270 return;
3271 vi = uma_zalloc(vnodepoll_zone, M_WAITOK);
3272 mtx_init(&vi->vpi_lock, "vnode pollinfo", NULL, MTX_DEF);
3273 knlist_init(&vi->vpi_selinfo.si_note, vp, vfs_knllock,
115static void destroy_vpollinfo(struct vpollinfo *vi);
116
117/*
118 * Number of vnodes in existence. Increased whenever getnewvnode()
119 * allocates a new vnode, decreased on vdestroy() called on VI_DOOMed
120 * vnode.
121 */
122static unsigned long numvnodes;

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3267{
3268 struct vpollinfo *vi;
3269
3270 if (vp->v_pollinfo != NULL)
3271 return;
3272 vi = uma_zalloc(vnodepoll_zone, M_WAITOK);
3273 mtx_init(&vi->vpi_lock, "vnode pollinfo", NULL, MTX_DEF);
3274 knlist_init(&vi->vpi_selinfo.si_note, vp, vfs_knllock,
3274 vfs_knlunlock, vfs_knllocked);
3275 vfs_knlunlock, vfs_knl_assert_locked, vfs_knl_assert_unlocked);
3275 VI_LOCK(vp);
3276 if (vp->v_pollinfo != NULL) {
3277 VI_UNLOCK(vp);
3278 destroy_vpollinfo(vi);
3279 return;
3280 }
3281 vp->v_pollinfo = vi;
3282 VI_UNLOCK(vp);

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3981 VFS_KNOTE_LOCKED(a->a_dvp, NOTE_WRITE);
3982}
3983
3984static struct knlist fs_knlist;
3985
3986static void
3987vfs_event_init(void *arg)
3988{
3276 VI_LOCK(vp);
3277 if (vp->v_pollinfo != NULL) {
3278 VI_UNLOCK(vp);
3279 destroy_vpollinfo(vi);
3280 return;
3281 }
3282 vp->v_pollinfo = vi;
3283 VI_UNLOCK(vp);

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3982 VFS_KNOTE_LOCKED(a->a_dvp, NOTE_WRITE);
3983}
3984
3985static struct knlist fs_knlist;
3986
3987static void
3988vfs_event_init(void *arg)
3989{
3989 knlist_init(&fs_knlist, NULL, NULL, NULL, NULL);
3990 knlist_init_mtx(&fs_knlist, NULL);
3990}
3991/* XXX - correct order? */
3992SYSINIT(vfs_knlist, SI_SUB_VFS, SI_ORDER_ANY, vfs_event_init, NULL);
3993
3994void
3995vfs_event_signal(fsid_t *fsid, u_int32_t event, intptr_t data __unused)
3996{
3997

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4094static void
4095vfs_knlunlock(void *arg)
4096{
4097 struct vnode *vp = arg;
4098
4099 VOP_UNLOCK(vp, 0);
4100}
4101
3991}
3992/* XXX - correct order? */
3993SYSINIT(vfs_knlist, SI_SUB_VFS, SI_ORDER_ANY, vfs_event_init, NULL);
3994
3995void
3996vfs_event_signal(fsid_t *fsid, u_int32_t event, intptr_t data __unused)
3997{
3998

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4095static void
4096vfs_knlunlock(void *arg)
4097{
4098 struct vnode *vp = arg;
4099
4100 VOP_UNLOCK(vp, 0);
4101}
4102
4102static int
4103vfs_knllocked(void *arg)
4103static void
4104vfs_knl_assert_locked(void *arg)
4104{
4105{
4106#ifdef DEBUG_VFS_LOCKS
4105 struct vnode *vp = arg;
4106
4107 struct vnode *vp = arg;
4108
4107 return (VOP_ISLOCKED(vp) == LK_EXCLUSIVE);
4109 ASSERT_VOP_LOCKED(vp, "vfs_knl_assert_locked");
4110#endif
4108}
4109
4111}
4112
4113static void
4114vfs_knl_assert_unlocked(void *arg)
4115{
4116#ifdef DEBUG_VFS_LOCKS
4117 struct vnode *vp = arg;
4118
4119 ASSERT_VOP_UNLOCKED(vp, "vfs_knl_assert_unlocked");
4120#endif
4121}
4122
4110int
4111vfs_kqfilter(struct vop_kqfilter_args *ap)
4112{
4113 struct vnode *vp = ap->a_vp;
4114 struct knote *kn = ap->a_kn;
4115 struct knlist *knl;
4116
4117 switch (kn->kn_filter) {

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4152}
4153
4154/*ARGSUSED*/
4155static int
4156filt_vfsread(struct knote *kn, long hint)
4157{
4158 struct vnode *vp = (struct vnode *)kn->kn_hook;
4159 struct vattr va;
4123int
4124vfs_kqfilter(struct vop_kqfilter_args *ap)
4125{
4126 struct vnode *vp = ap->a_vp;
4127 struct knote *kn = ap->a_kn;
4128 struct knlist *knl;
4129
4130 switch (kn->kn_filter) {

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4165}
4166
4167/*ARGSUSED*/
4168static int
4169filt_vfsread(struct knote *kn, long hint)
4170{
4171 struct vnode *vp = (struct vnode *)kn->kn_hook;
4172 struct vattr va;
4173 int res;
4160
4161 /*
4162 * filesystem is gone, so set the EOF flag and schedule
4163 * the knote for deletion.
4164 */
4165 if (hint == NOTE_REVOKE) {
4174
4175 /*
4176 * filesystem is gone, so set the EOF flag and schedule
4177 * the knote for deletion.
4178 */
4179 if (hint == NOTE_REVOKE) {
4180 VI_LOCK(vp);
4166 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
4181 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
4182 VI_UNLOCK(vp);
4167 return (1);
4168 }
4169
4170 if (VOP_GETATTR(vp, &va, curthread->td_ucred))
4171 return (0);
4172
4183 return (1);
4184 }
4185
4186 if (VOP_GETATTR(vp, &va, curthread->td_ucred))
4187 return (0);
4188
4189 VI_LOCK(vp);
4173 kn->kn_data = va.va_size - kn->kn_fp->f_offset;
4190 kn->kn_data = va.va_size - kn->kn_fp->f_offset;
4174 return (kn->kn_data != 0);
4191 res = (kn->kn_data != 0);
4192 VI_UNLOCK(vp);
4193 return (res);
4175}
4176
4177/*ARGSUSED*/
4178static int
4179filt_vfswrite(struct knote *kn, long hint)
4180{
4194}
4195
4196/*ARGSUSED*/
4197static int
4198filt_vfswrite(struct knote *kn, long hint)
4199{
4200 struct vnode *vp = (struct vnode *)kn->kn_hook;
4201
4202 VI_LOCK(vp);
4203
4181 /*
4182 * filesystem is gone, so set the EOF flag and schedule
4183 * the knote for deletion.
4184 */
4185 if (hint == NOTE_REVOKE)
4186 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
4187
4188 kn->kn_data = 0;
4204 /*
4205 * filesystem is gone, so set the EOF flag and schedule
4206 * the knote for deletion.
4207 */
4208 if (hint == NOTE_REVOKE)
4209 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
4210
4211 kn->kn_data = 0;
4212 VI_UNLOCK(vp);
4189 return (1);
4190}
4191
4192static int
4193filt_vfsvnode(struct knote *kn, long hint)
4194{
4213 return (1);
4214}
4215
4216static int
4217filt_vfsvnode(struct knote *kn, long hint)
4218{
4219 struct vnode *vp = (struct vnode *)kn->kn_hook;
4220 int res;
4221
4222 VI_LOCK(vp);
4195 if (kn->kn_sfflags & hint)
4196 kn->kn_fflags |= hint;
4197 if (hint == NOTE_REVOKE) {
4198 kn->kn_flags |= EV_EOF;
4223 if (kn->kn_sfflags & hint)
4224 kn->kn_fflags |= hint;
4225 if (hint == NOTE_REVOKE) {
4226 kn->kn_flags |= EV_EOF;
4227 VI_UNLOCK(vp);
4199 return (1);
4200 }
4228 return (1);
4229 }
4201 return (kn->kn_fflags != 0);
4230 res = (kn->kn_fflags != 0);
4231 VI_UNLOCK(vp);
4232 return (res);
4202}
4203
4204int
4205vfs_read_dirent(struct vop_readdir_args *ap, struct dirent *dp, off_t off)
4206{
4207 int error;
4208
4209 if (dp->d_reclen > ap->a_uio->uio_resid)

--- 83 unchanged lines hidden --- 		4233}
4234
4235int
4236vfs_read_dirent(struct vop_readdir_args *ap, struct dirent *dp, off_t off)
4237{
4238 int error;
4239
4240 if (dp->d_reclen > ap->a_uio->uio_resid)

--- 83 unchanged lines hidden ---