/*
- * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2014 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * Copyright (c) 1999-2003 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
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * 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
* Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
* @(#)vfs_vnops.c 8.14 (Berkeley) 6/15/95
*
*/
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections. This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */
#include <sys/param.h>
+#include <sys/types.h>
#include <sys/systm.h>
#include <sys/kernel.h>
-#include <sys/file.h>
+#include <sys/file_internal.h>
#include <sys/stat.h>
-#include <sys/buf.h>
-#include <sys/proc.h>
-#include <sys/mount.h>
+#include <sys/proc_internal.h>
+#include <sys/kauth.h>
+#include <sys/mount_internal.h>
#include <sys/namei.h>
-#include <sys/vnode.h>
+#include <sys/vnode_internal.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
+/* Temporary workaround for ubc.h until <rdar://4714366 is resolved */
+#define ubc_setcred ubc_setcred_deprecated
#include <sys/ubc.h>
+#undef ubc_setcred
+int ubc_setcred(struct vnode *, struct proc *);
#include <sys/conf.h>
#include <sys/disk.h>
+#include <sys/fsevents.h>
+#include <sys/kdebug.h>
+#include <sys/xattr.h>
+#include <sys/ubc_internal.h>
+#include <sys/uio_internal.h>
+#include <sys/resourcevar.h>
+#include <sys/signalvar.h>
#include <vm/vm_kern.h>
+#include <vm/vm_map.h>
#include <miscfs/specfs/specdev.h>
+#include <miscfs/fifofs/fifo.h>
-static int vn_closefile __P((struct file *fp, struct proc *p));
-static int vn_ioctl __P((struct file *fp, u_long com, caddr_t data,
- struct proc *p));
-static int vn_read __P((struct file *fp, struct uio *uio,
- struct ucred *cred, int flags, struct proc *p));
-static int vn_write __P((struct file *fp, struct uio *uio,
- struct ucred *cred, int flags, struct proc *p));
-static int vn_select __P(( struct file *fp, int which, void * wql,
- struct proc *p));
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
+
+#if CONFIG_PROTECT
+#include <sys/cprotect.h>
+#endif
+
+extern void sigpup_attach_vnode(vnode_t); /* XXX */
+
+static int vn_closefile(struct fileglob *fp, vfs_context_t ctx);
+static int vn_ioctl(struct fileproc *fp, u_long com, caddr_t data,
+ vfs_context_t ctx);
+static int vn_read(struct fileproc *fp, struct uio *uio, int flags,
+ vfs_context_t ctx);
+static int vn_write(struct fileproc *fp, struct uio *uio, int flags,
+ vfs_context_t ctx);
+static int vn_select( struct fileproc *fp, int which, void * wql,
+ vfs_context_t ctx);
+static int vn_kqfilt_add(struct fileproc *fp, struct knote *kn,
+ vfs_context_t ctx);
+static void filt_vndetach(struct knote *kn);
+static int filt_vnode(struct knote *kn, long hint);
+static int vn_open_auth_finish(vnode_t vp, int fmode, vfs_context_t ctx);
+#if 0
+static int vn_kqfilt_remove(struct vnode *vp, uintptr_t ident,
+ vfs_context_t ctx);
+#endif
-struct fileops vnops =
- { vn_read, vn_write, vn_ioctl, vn_select, vn_closefile };
+const struct fileops vnops = {
+ DTYPE_VNODE,
+ vn_read,
+ vn_write,
+ vn_ioctl,
+ vn_select,
+ vn_closefile,
+ vn_kqfilt_add,
+ NULL
+};
+
+struct filterops vnode_filtops = {
+ .f_isfd = 1,
+ .f_attach = NULL,
+ .f_detach = filt_vndetach,
+ .f_event = filt_vnode
+};
/*
* Common code for vnode open operations.
- * Check permissions, and call the VOP_OPEN or VOP_CREATE routine.
+ * Check permissions, and call the VNOP_OPEN or VNOP_CREATE routine.
+ *
+ * XXX the profusion of interfaces here is probably a bad thing.
+ */
+int
+vn_open(struct nameidata *ndp, int fmode, int cmode)
+{
+ return(vn_open_modflags(ndp, &fmode, cmode));
+}
+
+int
+vn_open_modflags(struct nameidata *ndp, int *fmodep, int cmode)
+{
+ struct vnode_attr va;
+
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_mode, cmode);
+
+ return(vn_open_auth(ndp, fmodep, &va));
+}
+
+static int
+vn_open_auth_finish(vnode_t vp, int fmode, vfs_context_t ctx)
+{
+ int error;
+
+ if ((error = vnode_ref_ext(vp, fmode, 0)) != 0) {
+ goto bad;
+ }
+
+ /* Call out to allow 3rd party notification of open.
+ * Ignore result of kauth_authorize_fileop call.
+ */
+#if CONFIG_MACF
+ mac_vnode_notify_open(ctx, vp, fmode);
+#endif
+ kauth_authorize_fileop(vfs_context_ucred(ctx), KAUTH_FILEOP_OPEN,
+ (uintptr_t)vp, 0);
+
+ sigpup_attach_vnode(vp);
+
+ return 0;
+
+bad:
+ return error;
+
+}
+
+/*
+ * May do nameidone() to allow safely adding an FSEvent. Cue off of ni_dvp to
+ * determine whether that has happened.
+ */
+static int
+vn_open_auth_do_create(struct nameidata *ndp, struct vnode_attr *vap, int fmode, boolean_t *did_create, boolean_t *did_open, vfs_context_t ctx)
+{
+ uint32_t status = 0;
+ vnode_t dvp = ndp->ni_dvp;
+ int batched;
+ int error;
+ vnode_t vp;
+
+ batched = vnode_compound_open_available(ndp->ni_dvp);
+ *did_open = FALSE;
+
+ VATTR_SET(vap, va_type, VREG);
+ if (fmode & O_EXCL)
+ vap->va_vaflags |= VA_EXCLUSIVE;
+
+#if NAMEDRSRCFORK
+ if (ndp->ni_cnd.cn_flags & CN_WANTSRSRCFORK) {
+ if ((error = vn_authorize_create(dvp, &ndp->ni_cnd, vap, ctx, NULL)) != 0)
+ goto out;
+ if ((error = vnode_makenamedstream(dvp, &ndp->ni_vp, XATTR_RESOURCEFORK_NAME, 0, ctx)) != 0)
+ goto out;
+ *did_create = TRUE;
+ } else {
+#endif
+ if (!batched) {
+ if ((error = vn_authorize_create(dvp, &ndp->ni_cnd, vap, ctx, NULL)) != 0)
+ goto out;
+ }
+
+ error = vn_create(dvp, &ndp->ni_vp, ndp, vap, VN_CREATE_DOOPEN, fmode, &status, ctx);
+ if (error != 0) {
+ if (batched) {
+ *did_create = (status & COMPOUND_OPEN_STATUS_DID_CREATE) ? TRUE : FALSE;
+ } else {
+ *did_create = FALSE;
+ }
+
+ if (error == EKEEPLOOKING) {
+ if (*did_create) {
+ panic("EKEEPLOOKING, but we did a create?");
+ }
+ if (!batched) {
+ panic("EKEEPLOOKING from filesystem that doesn't support compound vnops?");
+ }
+ if ((ndp->ni_flag & NAMEI_CONTLOOKUP) == 0) {
+ panic("EKEEPLOOKING, but continue flag not set?");
+ }
+
+ /*
+ * Do NOT drop the dvp: we need everything to continue the lookup.
+ */
+ return error;
+ }
+ } else {
+ if (batched) {
+ *did_create = (status & COMPOUND_OPEN_STATUS_DID_CREATE) ? 1 : 0;
+ *did_open = TRUE;
+ } else {
+ *did_create = TRUE;
+ }
+ }
+#if NAMEDRSRCFORK
+ }
+#endif
+
+ vp = ndp->ni_vp;
+
+ if (*did_create) {
+ int update_flags = 0;
+
+ // Make sure the name & parent pointers are hooked up
+ if (vp->v_name == NULL)
+ update_flags |= VNODE_UPDATE_NAME;
+ if (vp->v_parent == NULLVP)
+ update_flags |= VNODE_UPDATE_PARENT;
+
+ if (update_flags)
+ vnode_update_identity(vp, dvp, ndp->ni_cnd.cn_nameptr, ndp->ni_cnd.cn_namelen, ndp->ni_cnd.cn_hash, update_flags);
+
+ vnode_put(dvp);
+ ndp->ni_dvp = NULLVP;
+
+#if CONFIG_FSE
+ if (need_fsevent(FSE_CREATE_FILE, vp)) {
+ add_fsevent(FSE_CREATE_FILE, ctx,
+ FSE_ARG_VNODE, vp,
+ FSE_ARG_DONE);
+ }
+#endif
+ }
+out:
+ if (ndp->ni_dvp != NULLVP) {
+ vnode_put(dvp);
+ ndp->ni_dvp = NULLVP;
+ }
+
+ return error;
+}
+
+/*
+ * Open a file with authorization, updating the contents of the structures
+ * pointed to by ndp, fmodep, and vap as necessary to perform the requested
+ * operation. This function is used for both opens of existing files, and
+ * creation of new files.
+ *
+ * Parameters: ndp The nami data pointer describing the
+ * file
+ * fmodep A pointer to an int containg the mode
+ * information to be used for the open
+ * vap A pointer to the vnode attribute
+ * descriptor to be used for the open
+ *
+ * Indirect: * Contents of the data structures pointed
+ * to by the parameters are modified as
+ * necessary to the requested operation.
+ *
+ * Returns: 0 Success
+ * !0 errno value
+ *
+ * Notes: The kauth_filesec_t in 'vap', if any, is in host byte order.
+ *
+ * The contents of '*ndp' will be modified, based on the other
+ * arguments to this function, and to return file and directory
+ * data necessary to satisfy the requested operation.
+ *
+ * If the file does not exist and we are creating it, then the
+ * O_TRUNC flag will be cleared in '*fmodep' to indicate to the
+ * caller that the file was not truncated.
+ *
+ * If the file exists and the O_EXCL flag was not specified, then
+ * the O_CREAT flag will be cleared in '*fmodep' to indicate to
+ * the caller that the existing file was merely opened rather
+ * than created.
+ *
+ * The contents of '*vap' will be modified as necessary to
+ * complete the operation, including setting of supported
+ * attribute, clearing of fields containing unsupported attributes
+ * in the request, if the request proceeds without them, etc..
+ *
+ * XXX: This function is too complicated in actings on its arguments
+ *
+ * XXX: We should enummerate the possible errno values here, and where
+ * in the code they originated.
*/
int
-vn_open(ndp, fmode, cmode)
- register struct nameidata *ndp;
- int fmode, cmode;
+vn_open_auth(struct nameidata *ndp, int *fmodep, struct vnode_attr *vap)
{
- register struct vnode *vp;
- register struct proc *p = ndp->ni_cnd.cn_proc;
- register struct ucred *cred = p->p_ucred;
- struct vattr vat;
- struct vattr *vap = &vat;
+ struct vnode *vp;
+ struct vnode *dvp;
+ vfs_context_t ctx = ndp->ni_cnd.cn_context;
int error;
- int didhold = 0;
+ int fmode;
+ uint32_t origcnflags;
+ boolean_t did_create;
+ boolean_t did_open;
+ boolean_t need_vnop_open;
+ boolean_t batched;
+ boolean_t ref_failed;
+
+again:
+ vp = NULL;
+ dvp = NULL;
+ batched = FALSE;
+ did_create = FALSE;
+ need_vnop_open = TRUE;
+ ref_failed = FALSE;
+ fmode = *fmodep;
+ origcnflags = ndp->ni_cnd.cn_flags;
+ /*
+ * O_CREAT
+ */
if (fmode & O_CREAT) {
+ if ( (fmode & O_DIRECTORY) ) {
+ error = EINVAL;
+ goto out;
+ }
ndp->ni_cnd.cn_nameiop = CREATE;
- ndp->ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF;
- if ((fmode & O_EXCL) == 0)
+#if CONFIG_TRIGGERS
+ ndp->ni_op = OP_LINK;
+#endif
+ /* Inherit USEDVP, vnode_open() supported flags only */
+ ndp->ni_cnd.cn_flags &= (USEDVP | NOCROSSMOUNT);
+ ndp->ni_cnd.cn_flags |= LOCKPARENT | LOCKLEAF | AUDITVNPATH1;
+ ndp->ni_flag = NAMEI_COMPOUNDOPEN;
+#if NAMEDRSRCFORK
+ /* open calls are allowed for resource forks. */
+ ndp->ni_cnd.cn_flags |= CN_ALLOWRSRCFORK;
+#endif
+ if ((fmode & O_EXCL) == 0 && (fmode & O_NOFOLLOW) == 0 && (origcnflags & FOLLOW) != 0)
ndp->ni_cnd.cn_flags |= FOLLOW;
- bwillwrite();
- if (error = namei(ndp))
- return (error);
- if (ndp->ni_vp == NULL) {
- VATTR_NULL(vap);
- vap->va_type = VREG;
- vap->va_mode = cmode;
- if (fmode & O_EXCL)
- vap->va_vaflags |= VA_EXCLUSIVE;
- VOP_LEASE(ndp->ni_dvp, p, cred, LEASE_WRITE);
- if (error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
- &ndp->ni_cnd, vap))
- return (error);
- fmode &= ~O_TRUNC;
- vp = ndp->ni_vp;
- } else {
- VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd);
- if (ndp->ni_dvp == ndp->ni_vp)
- vrele(ndp->ni_dvp);
- else
- vput(ndp->ni_dvp);
- ndp->ni_dvp = NULL;
+
+continue_create_lookup:
+ if ( (error = namei(ndp)) )
+ goto out;
+
+ dvp = ndp->ni_dvp;
+ vp = ndp->ni_vp;
+
+ batched = vnode_compound_open_available(dvp);
+
+ /* not found, create */
+ if (vp == NULL) {
+ /* must have attributes for a new file */
+ if (vap == NULL) {
+ vnode_put(dvp);
+ error = EINVAL;
+ goto out;
+ }
+ /*
+ * Attempt a create. For a system supporting compound VNOPs, we may
+ * find an existing file or create one; in either case, we will already
+ * have the file open and no VNOP_OPEN() will be needed.
+ */
+ error = vn_open_auth_do_create(ndp, vap, fmode, &did_create, &did_open, ctx);
+
+ dvp = ndp->ni_dvp;
vp = ndp->ni_vp;
- if (fmode & O_EXCL) {
+
+ /*
+ * Detected a node that the filesystem couldn't handle. Don't call
+ * nameidone() yet, because we need that path buffer.
+ */
+ if (error == EKEEPLOOKING) {
+ if (!batched) {
+ panic("EKEEPLOOKING from a filesystem that doesn't support compound VNOPs?");
+ }
+ goto continue_create_lookup;
+ }
+
+ nameidone(ndp);
+ if (dvp) {
+ panic("Shouldn't have a dvp here.");
+ }
+
+ if (error) {
+ /*
+ * Check for a creation or unlink race.
+ */
+ if (((error == EEXIST) && !(fmode & O_EXCL)) ||
+ ((error == ENOENT) && (fmode & O_CREAT))){
+ if (vp)
+ vnode_put(vp);
+ goto again;
+ }
+ goto bad;
+ }
+
+ need_vnop_open = !did_open;
+ }
+ else {
+ if (fmode & O_EXCL)
error = EEXIST;
+
+ /*
+ * We have a vnode. Use compound open if available
+ * or else fall through to "traditional" path. Note: can't
+ * do a compound open for root, because the parent belongs
+ * to a different FS.
+ */
+ if (error == 0 && batched && (vnode_mount(dvp) == vnode_mount(vp))) {
+ error = VNOP_COMPOUND_OPEN(dvp, &ndp->ni_vp, ndp, 0, fmode, NULL, NULL, ctx);
+
+ if (error == 0) {
+ vp = ndp->ni_vp;
+ need_vnop_open = FALSE;
+ } else if (error == EKEEPLOOKING) {
+ if ((ndp->ni_flag & NAMEI_CONTLOOKUP) == 0) {
+ panic("EKEEPLOOKING, but continue flag not set?");
+ }
+ goto continue_create_lookup;
+ }
+ }
+ nameidone(ndp);
+ vnode_put(dvp);
+ ndp->ni_dvp = NULLVP;
+
+ if (error) {
goto bad;
}
+
fmode &= ~O_CREAT;
+
+ /* Fall through */
}
- } else {
- ndp->ni_cnd.cn_nameiop = LOOKUP;
- ndp->ni_cnd.cn_flags = FOLLOW | LOCKLEAF;
- if (error = namei(ndp))
- return (error);
- vp = ndp->ni_vp;
- }
- if (vp->v_type == VSOCK) {
- error = EOPNOTSUPP;
- goto bad;
}
+ else {
+ /*
+ * Not O_CREAT
+ */
+ ndp->ni_cnd.cn_nameiop = LOOKUP;
+ /* Inherit USEDVP, vnode_open() supported flags only */
+ ndp->ni_cnd.cn_flags &= (USEDVP | NOCROSSMOUNT);
+ ndp->ni_cnd.cn_flags |= FOLLOW | LOCKLEAF | AUDITVNPATH1 | WANTPARENT;
+#if NAMEDRSRCFORK
+ /* open calls are allowed for resource forks. */
+ ndp->ni_cnd.cn_flags |= CN_ALLOWRSRCFORK;
+#endif
+ ndp->ni_flag = NAMEI_COMPOUNDOPEN;
-#if DIAGNOSTIC
- if (UBCINFOMISSING(vp))
- panic("vn_open: ubc_info_init");
-#endif /* DIAGNOSTIC */
+ /* preserve NOFOLLOW from vnode_open() */
+ if (fmode & O_NOFOLLOW || fmode & O_SYMLINK || (origcnflags & FOLLOW) == 0) {
+ ndp->ni_cnd.cn_flags &= ~FOLLOW;
+ }
- if (UBCINFOEXISTS(vp) && ((didhold = ubc_hold(vp)) == 0)) {
- error = ENOENT;
- goto bad;
+ /* Do a lookup, possibly going directly to filesystem for compound operation */
+ do {
+ if ( (error = namei(ndp)) )
+ goto out;
+ vp = ndp->ni_vp;
+ dvp = ndp->ni_dvp;
+
+ /* Check for batched lookup-open */
+ batched = vnode_compound_open_available(dvp);
+ if (batched && ((vp == NULLVP) || (vnode_mount(dvp) == vnode_mount(vp)))) {
+ error = VNOP_COMPOUND_OPEN(dvp, &ndp->ni_vp, ndp, 0, fmode, NULL, NULL, ctx);
+ vp = ndp->ni_vp;
+ if (error == 0) {
+ need_vnop_open = FALSE;
+ } else if (error == EKEEPLOOKING) {
+ if ((ndp->ni_flag & NAMEI_CONTLOOKUP) == 0) {
+ panic("EKEEPLOOKING, but continue flag not set?");
+ }
+ }
+ }
+ } while (error == EKEEPLOOKING);
+
+ nameidone(ndp);
+ vnode_put(dvp);
+ ndp->ni_dvp = NULLVP;
+
+ if (error) {
+ goto bad;
+ }
}
- if ((fmode & O_CREAT) == 0) {
- if (fmode & FREAD && fmode & (FWRITE | O_TRUNC)) {
- int err = 0;
- if (vp->v_type == VDIR)
- err = EISDIR;
- else
- err = vn_writechk(vp);
- if (err && !(error = VOP_ACCESS(vp, VREAD, cred, p)))
- error = err;
- if (error || (error = VOP_ACCESS(vp, VREAD|VWRITE,
- cred, p)))
- goto bad;
- } else if (fmode & FREAD) {
- if ((error = VOP_ACCESS(vp, VREAD, cred, p)))
- goto bad;
- } else if (fmode & (FWRITE | O_TRUNC)) {
- if (vp->v_type == VDIR) {
- error = EISDIR;
+ /*
+ * By this point, nameidone() is called, dvp iocount is dropped,
+ * and dvp pointer is cleared.
+ */
+ if (ndp->ni_dvp != NULLVP) {
+ panic("Haven't cleaned up adequately in vn_open_auth()");
+ }
+
+ /*
+ * Expect to use this code for filesystems without compound VNOPs, for the root
+ * of a filesystem, which can't be "looked up" in the sense of VNOP_LOOKUP(),
+ * and for shadow files, which do not live on the same filesystems as their "parents."
+ */
+ if (need_vnop_open) {
+ if (batched && !vnode_isvroot(vp) && !vnode_isnamedstream(vp)) {
+ panic("Why am I trying to use VNOP_OPEN() on anything other than the root or a named stream?");
+ }
+
+ if (!did_create) {
+ error = vn_authorize_open_existing(vp, &ndp->ni_cnd, fmode, ctx, NULL);
+ if (error) {
goto bad;
}
- if ((error = vn_writechk(vp)) ||
- (error = VOP_ACCESS(vp, VWRITE, cred, p)))
+ }
+
+#if CONFIG_PROTECT
+ /*
+ * Perform any content protection access checks prior to calling
+ * into the filesystem, if the raw encrypted mode was not
+ * requested.
+ *
+ * If the va_dataprotect_flags are NOT active, or if they are,
+ * but they do not have the VA_DP_RAWENCRYPTED bit set, then we need
+ * to perform the checks.
+ */
+ if (!(VATTR_IS_ACTIVE (vap, va_dataprotect_flags)) ||
+ ((vap->va_dataprotect_flags & VA_DP_RAWENCRYPTED) == 0)) {
+ error = cp_handle_open (vp, fmode);
+ if (error) {
goto bad;
+ }
}
- }
- if (fmode & O_TRUNC) {
- VOP_UNLOCK(vp, 0, p); /* XXX */
- VOP_LEASE(vp, p, cred, LEASE_WRITE);
- (void)vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); /* XXX */
- VATTR_NULL(vap);
- vap->va_size = 0;
- if (error = VOP_SETATTR(vp, vap, cred, p))
+#endif
+
+ error = VNOP_OPEN(vp, fmode, ctx);
+ if (error) {
goto bad;
+ }
+ need_vnop_open = FALSE;
+ }
+
+ // if the vnode is tagged VOPENEVT and the current process
+ // has the P_CHECKOPENEVT flag set, then we or in the O_EVTONLY
+ // flag to the open mode so that this open won't count against
+ // the vnode when carbon delete() does a vnode_isinuse() to see
+ // if a file is currently in use. this allows spotlight
+ // importers to not interfere with carbon apps that depend on
+ // the no-delete-if-busy semantics of carbon delete().
+ //
+ if (!did_create && (vp->v_flag & VOPENEVT) && (current_proc()->p_flag & P_CHECKOPENEVT)) {
+ fmode |= O_EVTONLY;
}
- if (error = VOP_OPEN(vp, fmode, cred, p)) {
+ /*
+ * Grab reference, etc.
+ */
+ error = vn_open_auth_finish(vp, fmode, ctx);
+ if (error) {
+ ref_failed = TRUE;
goto bad;
}
- if (fmode & FWRITE)
- if (++vp->v_writecount <= 0)
- panic("vn_open: v_writecount");
+ /* Compound VNOP open is responsible for doing the truncate */
+ if (batched || did_create)
+ fmode &= ~O_TRUNC;
+
+ *fmodep = fmode;
return (0);
+
bad:
- VOP_UNLOCK(vp, 0, p);
- if (didhold)
- ubc_rele(vp);
- vrele(vp);
+ /* Opened either explicitly or by a batched create */
+ if (!need_vnop_open) {
+ VNOP_CLOSE(vp, fmode, ctx);
+ }
+
+ ndp->ni_vp = NULL;
+ if (vp) {
+#if NAMEDRSRCFORK
+ /* Aggressively recycle shadow files if we error'd out during open() */
+ if ((vnode_isnamedstream(vp)) &&
+ (vp->v_parent != NULLVP) &&
+ (vnode_isshadow(vp))) {
+ vnode_recycle(vp);
+ }
+#endif
+ vnode_put(vp);
+ /*
+ * Check for a race against unlink. We had a vnode
+ * but according to vnode_authorize or VNOP_OPEN it
+ * no longer exists.
+ *
+ * EREDRIVEOPEN: means that we were hit by the tty allocation race.
+ */
+ if (((error == ENOENT) && (*fmodep & O_CREAT)) || (error == EREDRIVEOPEN) || ref_failed) {
+ goto again;
+ }
+ }
+
+out:
return (error);
}
+#if vn_access_DEPRECATED
/*
- * Check for write permissions on the specified vnode.
- * Prototype text segments cannot be written.
+ * Authorize an action against a vnode. This has been the canonical way to
+ * ensure that the credential/process/etc. referenced by a vfs_context
+ * is granted the rights called out in 'mode' against the vnode 'vp'.
+ *
+ * Unfortunately, the use of VREAD/VWRITE/VEXEC makes it very difficult
+ * to add support for more rights. As such, this interface will be deprecated
+ * and callers will use vnode_authorize instead.
*/
int
-vn_writechk(vp)
- register struct vnode *vp;
+vn_access(vnode_t vp, int mode, vfs_context_t context)
{
-
- /*
- * If there's shared text associated with
- * the vnode, try to free it up once. If
- * we fail, we can't allow writing.
- */
-#if 0
- /* XXXXX Not sure we need this */
- if (vp->v_flag & VTEXT)
- return (ETXTBSY);
-#endif /* 0 */
- return (0);
+ kauth_action_t action;
+
+ action = 0;
+ if (mode & VREAD)
+ action |= KAUTH_VNODE_READ_DATA;
+ if (mode & VWRITE)
+ action |= KAUTH_VNODE_WRITE_DATA;
+ if (mode & VEXEC)
+ action |= KAUTH_VNODE_EXECUTE;
+
+ return(vnode_authorize(vp, NULL, action, context));
}
+#endif /* vn_access_DEPRECATED */
/*
* Vnode close call
*/
int
-vn_close(vp, flags, cred, p)
- register struct vnode *vp;
- int flags;
- struct ucred *cred;
- struct proc *p;
+vn_close(struct vnode *vp, int flags, vfs_context_t ctx)
{
int error;
+ int flusherror = 0;
+
+#if NAMEDRSRCFORK
+ /* Sync data from resource fork shadow file if needed. */
+ if ((vp->v_flag & VISNAMEDSTREAM) &&
+ (vp->v_parent != NULLVP) &&
+ vnode_isshadow(vp)) {
+ if (flags & FWASWRITTEN) {
+ flusherror = vnode_flushnamedstream(vp->v_parent, vp, ctx);
+ }
+ }
+#endif
+
+ /* work around for foxhound */
+ if (vnode_isspec(vp))
+ (void)vnode_rele_ext(vp, flags, 0);
+
+ /*
+ * On HFS, we flush when the last writer closes. We do this
+ * because resource fork vnodes hold a reference on data fork
+ * vnodes and that will prevent them from getting VNOP_INACTIVE
+ * which will delay when we flush cached data. In future, we
+ * might find it beneficial to do this for all file systems.
+ * Note that it's OK to access v_writecount without the lock
+ * in this context.
+ */
+ if (vp->v_tag == VT_HFS && (flags & FWRITE) && vp->v_writecount == 1)
+ VNOP_FSYNC(vp, MNT_NOWAIT, ctx);
+
+ error = VNOP_CLOSE(vp, flags, ctx);
- if (flags & FWRITE)
- vp->v_writecount--;
- error = VOP_CLOSE(vp, flags, cred, p);
- ubc_rele(vp);
- vrele(vp);
+#if CONFIG_FSE
+ if (flags & FWASWRITTEN) {
+ if (need_fsevent(FSE_CONTENT_MODIFIED, vp)) {
+ add_fsevent(FSE_CONTENT_MODIFIED, ctx,
+ FSE_ARG_VNODE, vp,
+ FSE_ARG_DONE);
+ }
+ }
+#endif
+
+ if (!vnode_isspec(vp))
+ (void)vnode_rele_ext(vp, flags, 0);
+
+ if (flusherror) {
+ error = flusherror;
+ }
return (error);
}
+static int
+vn_read_swapfile(
+ struct vnode *vp,
+ uio_t uio)
+{
+ int error;
+ off_t swap_count, this_count;
+ off_t file_end, read_end;
+ off_t prev_resid;
+ char *my_swap_page;
+
+ /*
+ * Reading from a swap file will get you zeroes.
+ */
+
+ my_swap_page = NULL;
+ error = 0;
+ swap_count = uio_resid(uio);
+
+ file_end = ubc_getsize(vp);
+ read_end = uio->uio_offset + uio_resid(uio);
+ if (uio->uio_offset >= file_end) {
+ /* uio starts after end of file: nothing to read */
+ swap_count = 0;
+ } else if (read_end > file_end) {
+ /* uio extends beyond end of file: stop before that */
+ swap_count -= (read_end - file_end);
+ }
+
+ while (swap_count > 0) {
+ if (my_swap_page == NULL) {
+ MALLOC(my_swap_page, char *, PAGE_SIZE,
+ M_TEMP, M_WAITOK);
+ memset(my_swap_page, '\0', PAGE_SIZE);
+ /* add an end-of-line to keep line counters happy */
+ my_swap_page[PAGE_SIZE-1] = '\n';
+ }
+ this_count = swap_count;
+ if (this_count > PAGE_SIZE) {
+ this_count = PAGE_SIZE;
+ }
+
+ prev_resid = uio_resid(uio);
+ error = uiomove((caddr_t) my_swap_page,
+ this_count,
+ uio);
+ if (error) {
+ break;
+ }
+ swap_count -= (prev_resid - uio_resid(uio));
+ }
+ if (my_swap_page != NULL) {
+ FREE(my_swap_page, M_TEMP);
+ my_swap_page = NULL;
+ }
+
+ return error;
+}
/*
* Package up an I/O request on a vnode into a uio and do it.
*/
int
-vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid, p)
- enum uio_rw rw;
- struct vnode *vp;
- caddr_t base;
- int len;
- off_t offset;
- enum uio_seg segflg;
- int ioflg;
- struct ucred *cred;
- int *aresid;
- struct proc *p;
+vn_rdwr(
+ enum uio_rw rw,
+ struct vnode *vp,
+ caddr_t base,
+ int len,
+ off_t offset,
+ enum uio_seg segflg,
+ int ioflg,
+ kauth_cred_t cred,
+ int *aresid,
+ proc_t p)
+{
+ int64_t resid;
+ int result;
+
+ result = vn_rdwr_64(rw,
+ vp,
+ (uint64_t)(uintptr_t)base,
+ (int64_t)len,
+ offset,
+ segflg,
+ ioflg,
+ cred,
+ &resid,
+ p);
+
+ /* "resid" should be bounded above by "len," which is an int */
+ if (aresid != NULL) {
+ *aresid = resid;
+ }
+
+ return result;
+}
+
+
+int
+vn_rdwr_64(
+ enum uio_rw rw,
+ struct vnode *vp,
+ uint64_t base,
+ int64_t len,
+ off_t offset,
+ enum uio_seg segflg,
+ int ioflg,
+ kauth_cred_t cred,
+ int64_t *aresid,
+ proc_t p)
{
- struct uio auio;
- struct iovec aiov;
+ uio_t auio;
+ int spacetype;
+ struct vfs_context context;
int error=0;
+ char uio_buf[ UIO_SIZEOF(1) ];
+
+ context.vc_thread = current_thread();
+ context.vc_ucred = cred;
+
+ if (UIO_SEG_IS_USER_SPACE(segflg)) {
+ spacetype = proc_is64bit(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
+ }
+ else {
+ spacetype = UIO_SYSSPACE;
+ }
+ auio = uio_createwithbuffer(1, offset, spacetype, rw,
+ &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, base, len);
- /* FIXME XXX */
- if ((ioflg & IO_NODELOCKED) == 0)
- (void)vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
- auio.uio_iov = &aiov;
- auio.uio_iovcnt = 1;
- aiov.iov_base = base;
- aiov.iov_len = len;
- auio.uio_resid = len;
- auio.uio_offset = offset;
- auio.uio_segflg = segflg;
- auio.uio_rw = rw;
- auio.uio_procp = p;
-
- if (rw == UIO_READ)
- error = VOP_READ(vp, &auio, ioflg, cred);
- else
- error = VOP_WRITE(vp, &auio, ioflg, cred);
+#if CONFIG_MACF
+ /* XXXMAC
+ * IO_NOAUTH should be re-examined.
+ * Likely that mediation should be performed in caller.
+ */
+ if ((ioflg & IO_NOAUTH) == 0) {
+ /* passed cred is fp->f_cred */
+ if (rw == UIO_READ)
+ error = mac_vnode_check_read(&context, cred, vp);
+ else
+ error = mac_vnode_check_write(&context, cred, vp);
+ }
+#endif
+
+ if (error == 0) {
+ if (rw == UIO_READ) {
+ if (vnode_isswap(vp) && ((ioflg & IO_SWAP_DISPATCH) == 0)) {
+ error = vn_read_swapfile(vp, auio);
+ } else {
+ error = VNOP_READ(vp, auio, ioflg, &context);
+ }
+ } else {
+ error = VNOP_WRITE(vp, auio, ioflg, &context);
+ }
+ }
if (aresid)
- *aresid = auio.uio_resid;
+ *aresid = uio_resid(auio);
else
- if (auio.uio_resid && error == 0)
+ if (uio_resid(auio) && error == 0)
error = EIO;
- if ((ioflg & IO_NODELOCKED) == 0)
- VOP_UNLOCK(vp, 0, p);
return (error);
}
+static inline void
+vn_offset_lock(struct fileglob *fg)
+{
+ lck_mtx_lock_spin(&fg->fg_lock);
+ while (fg->fg_lflags & FG_OFF_LOCKED) {
+ fg->fg_lflags |= FG_OFF_LOCKWANT;
+ msleep(&fg->fg_lflags, &fg->fg_lock, PVFS | PSPIN,
+ "fg_offset_lock_wait", 0);
+ }
+ fg->fg_lflags |= FG_OFF_LOCKED;
+ lck_mtx_unlock(&fg->fg_lock);
+}
+
+static inline void
+vn_offset_unlock(struct fileglob *fg)
+{
+ int lock_wanted = 0;
+
+ lck_mtx_lock_spin(&fg->fg_lock);
+ if (fg->fg_lflags & FG_OFF_LOCKWANT) {
+ lock_wanted = 1;
+ }
+ fg->fg_lflags &= ~(FG_OFF_LOCKED | FG_OFF_LOCKWANT);
+ lck_mtx_unlock(&fg->fg_lock);
+ if (lock_wanted) {
+ wakeup(&fg->fg_lflags);
+ }
+}
+
/*
* File table vnode read routine.
*/
static int
-vn_read(fp, uio, cred, flags, p)
- struct file *fp;
- struct uio *uio;
- struct ucred *cred;
- int flags;
- struct proc *p;
+vn_read(struct fileproc *fp, struct uio *uio, int flags, vfs_context_t ctx)
{
struct vnode *vp;
- int error, ioflag;
+ int error;
+ int ioflag;
off_t count;
+ int offset_locked = 0;
- if (p != uio->uio_procp)
- panic("vn_read: uio_procp does not match p");
+ vp = (struct vnode *)fp->f_fglob->fg_data;
+ if ( (error = vnode_getwithref(vp)) ) {
+ return(error);
+ }
- vp = (struct vnode *)fp->f_data;
- ioflag = 0;
- if (fp->f_flag & FNONBLOCK)
- ioflag |= IO_NDELAY;
- VOP_LEASE(vp, p, cred, LEASE_READ);
- error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
- if (error)
+#if CONFIG_MACF
+ error = mac_vnode_check_read(ctx, vfs_context_ucred(ctx), vp);
+ if (error) {
+ (void)vnode_put(vp);
return (error);
- if ((flags & FOF_OFFSET) == 0)
- uio->uio_offset = fp->f_offset;
- count = uio->uio_resid;
-
- if(UBCINFOEXISTS(vp)) {
- memory_object_t pager;
- struct iovec *iov;
- off_t file_off;
- kern_return_t kr = KERN_SUCCESS;
- kern_return_t ret = KERN_SUCCESS;
- int count;
-
- pager = (memory_object_t)ubc_getpager(vp);
- file_off = uio->uio_offset;
- iov = uio->uio_iov;
- count = uio->uio_iovcnt;
- while(count) {
- kr = vm_conflict_check(current_map(),
- (vm_offset_t)iov->iov_base, iov->iov_len,
- pager, file_off);
- if(kr == KERN_ALREADY_WAITING) {
- if((count != uio->uio_iovcnt) &&
- (ret != KERN_ALREADY_WAITING)) {
- error = EINVAL;
- goto done;
- }
- ret = KERN_ALREADY_WAITING;
- } else if (kr != KERN_SUCCESS) {
- error = EINVAL;
- goto done;
- }
- if(kr != ret) {
- error = EINVAL;
- goto done;
- }
- file_off += iov->iov_len;
- iov++;
- count--;
- }
- if(ret == KERN_ALREADY_WAITING) {
- uio->uio_resid = 0;
- if ((flags & FOF_OFFSET) == 0)
- fp->f_offset +=
- count - uio->uio_resid;
- error = 0;
- goto done;
- }
- }
- error = VOP_READ(vp, uio, ioflag, cred);
- if ((flags & FOF_OFFSET) == 0)
- fp->f_offset += count - uio->uio_resid;
-done:
- VOP_UNLOCK(vp, 0, p);
+ }
+#endif
+
+ /* This signals to VNOP handlers that this read came from a file table read */
+ ioflag = IO_SYSCALL_DISPATCH;
+
+ if (fp->f_fglob->fg_flag & FNONBLOCK)
+ ioflag |= IO_NDELAY;
+ if ((fp->f_fglob->fg_flag & FNOCACHE) || vnode_isnocache(vp))
+ ioflag |= IO_NOCACHE;
+ if (fp->f_fglob->fg_flag & FENCRYPTED) {
+ ioflag |= IO_ENCRYPTED;
+ }
+ if (fp->f_fglob->fg_flag & FNORDAHEAD)
+ ioflag |= IO_RAOFF;
+
+ if ((flags & FOF_OFFSET) == 0) {
+ if ((vnode_vtype(vp) == VREG) && !vnode_isswap(vp)) {
+ vn_offset_lock(fp->f_fglob);
+ offset_locked = 1;
+ }
+ uio->uio_offset = fp->f_fglob->fg_offset;
+ }
+ count = uio_resid(uio);
+
+ if (vnode_isswap(vp)) {
+ /* special case for swap files */
+ error = vn_read_swapfile(vp, uio);
+ } else {
+ error = VNOP_READ(vp, uio, ioflag, ctx);
+ }
+ if ((flags & FOF_OFFSET) == 0) {
+ fp->f_fglob->fg_offset += count - uio_resid(uio);
+ if (offset_locked) {
+ vn_offset_unlock(fp->f_fglob);
+ offset_locked = 0;
+ }
+ }
+
+ (void)vnode_put(vp);
return (error);
}
* File table vnode write routine.
*/
static int
-vn_write(fp, uio, cred, flags, p)
- struct file *fp;
- struct uio *uio;
- struct ucred *cred;
- int flags;
- struct proc *p;
+vn_write(struct fileproc *fp, struct uio *uio, int flags, vfs_context_t ctx)
{
struct vnode *vp;
int error, ioflag;
off_t count;
+ int clippedsize = 0;
+ int partialwrite=0;
+ int residcount, oldcount;
+ int offset_locked = 0;
+ proc_t p = vfs_context_proc(ctx);
- if (p != uio->uio_procp)
- panic("vn_write: uio_procp does not match p");
+ count = 0;
+ vp = (struct vnode *)fp->f_fglob->fg_data;
+ if ( (error = vnode_getwithref(vp)) ) {
+ return(error);
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_write(ctx, vfs_context_ucred(ctx), vp);
+ if (error) {
+ (void)vnode_put(vp);
+ return (error);
+ }
+#endif
- vp = (struct vnode *)fp->f_data;
- ioflag = IO_UNIT;
- if (vp->v_type == VREG)
- bwillwrite();
- if (vp->v_type == VREG && (fp->f_flag & O_APPEND))
+ /*
+ * IO_SYSCALL_DISPATCH signals to VNOP handlers that this write came from
+ * a file table write
+ */
+ ioflag = (IO_UNIT | IO_SYSCALL_DISPATCH);
+
+ if (vp->v_type == VREG && (fp->f_fglob->fg_flag & O_APPEND))
ioflag |= IO_APPEND;
- if (fp->f_flag & FNONBLOCK)
+ if (fp->f_fglob->fg_flag & FNONBLOCK)
ioflag |= IO_NDELAY;
- if ((fp->f_flag & O_FSYNC) ||
- (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)))
+ if ((fp->f_fglob->fg_flag & FNOCACHE) || vnode_isnocache(vp))
+ ioflag |= IO_NOCACHE;
+ if (fp->f_fglob->fg_flag & FNODIRECT)
+ ioflag |= IO_NODIRECT;
+ if (fp->f_fglob->fg_flag & FSINGLE_WRITER)
+ ioflag |= IO_SINGLE_WRITER;
+
+ /*
+ * Treat synchronous mounts and O_FSYNC on the fd as equivalent.
+ *
+ * XXX We treat O_DSYNC as O_FSYNC for now, since we can not delay
+ * XXX the non-essential metadata without some additional VFS work;
+ * XXX the intent at this point is to plumb the interface for it.
+ */
+ if ((fp->f_fglob->fg_flag & (O_FSYNC|O_DSYNC)) ||
+ (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) {
ioflag |= IO_SYNC;
- VOP_LEASE(vp, p, cred, LEASE_WRITE);
- error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
- if (error)
- return (error);
+ }
+
if ((flags & FOF_OFFSET) == 0) {
- uio->uio_offset = fp->f_offset;
- count = uio->uio_resid;
- }
-
- if(UBCINFOEXISTS(vp)) {
- memory_object_t pager;
- struct iovec *iov;
- off_t file_off;
- kern_return_t kr = KERN_SUCCESS;
- kern_return_t ret = KERN_SUCCESS;
- int count;
-
- pager = (memory_object_t)ubc_getpager(vp);
- file_off = uio->uio_offset;
- iov = uio->uio_iov;
- count = uio->uio_iovcnt;
- while(count) {
- kr = vm_conflict_check(current_map(),
- (vm_offset_t)iov->iov_base,
- iov->iov_len, pager, file_off);
- if(kr == KERN_ALREADY_WAITING) {
- if((count != uio->uio_iovcnt) &&
- (ret != KERN_ALREADY_WAITING)) {
- error = EINVAL;
- goto done;
- }
- ret = KERN_ALREADY_WAITING;
- } else if (kr != KERN_SUCCESS) {
- error = EINVAL;
- goto done;
- }
- if(kr != ret) {
- error = EINVAL;
- goto done;
- }
- file_off += iov->iov_len;
- iov++;
- count--;
+ if ((vnode_vtype(vp) == VREG) && !vnode_isswap(vp)) {
+ vn_offset_lock(fp->f_fglob);
+ offset_locked = 1;
+ }
+ uio->uio_offset = fp->f_fglob->fg_offset;
+ count = uio_resid(uio);
+ }
+ if (((flags & FOF_OFFSET) == 0) &&
+ vfs_context_proc(ctx) && (vp->v_type == VREG) &&
+ (((rlim_t)(uio->uio_offset + uio_resid(uio)) > p->p_rlimit[RLIMIT_FSIZE].rlim_cur) ||
+ ((rlim_t)uio_resid(uio) > (p->p_rlimit[RLIMIT_FSIZE].rlim_cur - uio->uio_offset)))) {
+ /*
+ * If the requested residual would cause us to go past the
+ * administrative limit, then we need to adjust the residual
+ * down to cause fewer bytes than requested to be written. If
+ * we can't do that (e.g. the residual is already 1 byte),
+ * then we fail the write with EFBIG.
+ */
+ residcount = uio_resid(uio);
+ if ((rlim_t)(uio->uio_offset + uio_resid(uio)) > p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
+ clippedsize = (uio->uio_offset + uio_resid(uio)) - p->p_rlimit[RLIMIT_FSIZE].rlim_cur;
+ } else if ((rlim_t)uio_resid(uio) > (p->p_rlimit[RLIMIT_FSIZE].rlim_cur - uio->uio_offset)) {
+ clippedsize = (p->p_rlimit[RLIMIT_FSIZE].rlim_cur - uio->uio_offset);
}
- if(ret == KERN_ALREADY_WAITING) {
- uio->uio_resid = 0;
- if ((flags & FOF_OFFSET) == 0)
- fp->f_offset +=
- count - uio->uio_resid;
- error = 0;
- goto done;
+ if (clippedsize >= residcount) {
+ psignal(p, SIGXFSZ);
+ error = EFBIG;
+ goto error_out;
+ }
+ partialwrite = 1;
+ uio_setresid(uio, residcount-clippedsize);
+ }
+ if ((flags & FOF_OFFSET) != 0) {
+ /* for pwrite, append should be ignored */
+ ioflag &= ~IO_APPEND;
+ if (p && (vp->v_type == VREG) &&
+ ((rlim_t)uio->uio_offset >= p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
+ psignal(p, SIGXFSZ);
+ error = EFBIG;
+ goto error_out;
+ }
+ if (p && (vp->v_type == VREG) &&
+ ((rlim_t)(uio->uio_offset + uio_resid(uio)) > p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
+ //Debugger("vn_bwrite:overstepping the bounds");
+ residcount = uio_resid(uio);
+ clippedsize = (uio->uio_offset + uio_resid(uio)) - p->p_rlimit[RLIMIT_FSIZE].rlim_cur;
+ partialwrite = 1;
+ uio_setresid(uio, residcount-clippedsize);
}
}
- error = VOP_WRITE(vp, uio, ioflag, cred);
+
+ error = VNOP_WRITE(vp, uio, ioflag, ctx);
+
+ if (partialwrite) {
+ oldcount = uio_resid(uio);
+ uio_setresid(uio, oldcount + clippedsize);
+ }
if ((flags & FOF_OFFSET) == 0) {
if (ioflag & IO_APPEND)
- fp->f_offset = uio->uio_offset;
+ fp->f_fglob->fg_offset = uio->uio_offset;
else
- fp->f_offset += count - uio->uio_resid;
+ fp->f_fglob->fg_offset += count - uio_resid(uio);
+ if (offset_locked) {
+ vn_offset_unlock(fp->f_fglob);
+ offset_locked = 0;
+ }
}
/*
* Set the credentials on successful writes
*/
if ((error == 0) && (vp->v_tag == VT_NFS) && (UBCINFOEXISTS(vp))) {
- ubc_setcred(vp, p);
+ /*
+ * When called from aio subsystem, we only have the proc from
+ * which to get the credential, at this point, so use that
+ * instead. This means aio functions are incompatible with
+ * per-thread credentials (aio operations are proxied). We
+ * can't easily correct the aio vs. settid race in this case
+ * anyway, so we disallow it.
+ */
+ if ((flags & FOF_PCRED) == 0) {
+ ubc_setthreadcred(vp, p, current_thread());
+ } else {
+ ubc_setcred(vp, p);
+ }
}
+ (void)vnode_put(vp);
+ return (error);
-done:
- VOP_UNLOCK(vp, 0, p);
+error_out:
+ if (offset_locked) {
+ vn_offset_unlock(fp->f_fglob);
+ }
+ (void)vnode_put(vp);
return (error);
}
/*
* File table vnode stat routine.
+ *
+ * Returns: 0 Success
+ * EBADF
+ * ENOMEM
+ * vnode_getattr:???
*/
int
-vn_stat(vp, sb, p)
- struct vnode *vp;
- register struct stat *sb;
- struct proc *p;
+vn_stat_noauth(struct vnode *vp, void *sbptr, kauth_filesec_t *xsec, int isstat64, vfs_context_t ctx)
{
- struct vattr vattr;
- register struct vattr *vap;
+ struct vnode_attr va;
int error;
u_short mode;
+ kauth_filesec_t fsec;
+ struct stat *sb = (struct stat *)0; /* warning avoidance ; protected by isstat64 */
+ struct stat64 * sb64 = (struct stat64 *)0; /* warning avoidance ; protected by isstat64 */
- vap = &vattr;
- error = VOP_GETATTR(vp, vap, p->p_ucred, p);
+ if (isstat64 != 0)
+ sb64 = (struct stat64 *)sbptr;
+ else
+ sb = (struct stat *)sbptr;
+ memset(&va, 0, sizeof(va));
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_fsid);
+ VATTR_WANTED(&va, va_fileid);
+ VATTR_WANTED(&va, va_mode);
+ VATTR_WANTED(&va, va_type);
+ VATTR_WANTED(&va, va_nlink);
+ VATTR_WANTED(&va, va_uid);
+ VATTR_WANTED(&va, va_gid);
+ VATTR_WANTED(&va, va_rdev);
+ VATTR_WANTED(&va, va_data_size);
+ VATTR_WANTED(&va, va_access_time);
+ VATTR_WANTED(&va, va_modify_time);
+ VATTR_WANTED(&va, va_change_time);
+ VATTR_WANTED(&va, va_create_time);
+ VATTR_WANTED(&va, va_flags);
+ VATTR_WANTED(&va, va_gen);
+ VATTR_WANTED(&va, va_iosize);
+ /* lower layers will synthesise va_total_alloc from va_data_size if required */
+ VATTR_WANTED(&va, va_total_alloc);
+ if (xsec != NULL) {
+ VATTR_WANTED(&va, va_uuuid);
+ VATTR_WANTED(&va, va_guuid);
+ VATTR_WANTED(&va, va_acl);
+ }
+ error = vnode_getattr(vp, &va, ctx);
if (error)
- return (error);
+ goto out;
/*
* Copy from vattr table
*/
- sb->st_dev = vap->va_fsid;
- sb->st_ino = vap->va_fileid;
- mode = vap->va_mode;
+ if (isstat64 != 0) {
+ sb64->st_dev = va.va_fsid;
+ sb64->st_ino = (ino64_t)va.va_fileid;
+
+ } else {
+ sb->st_dev = va.va_fsid;
+ sb->st_ino = (ino_t)va.va_fileid;
+ }
+ mode = va.va_mode;
switch (vp->v_type) {
case VREG:
mode |= S_IFREG;
mode |= S_IFIFO;
break;
default:
- return (EBADF);
+ error = EBADF;
+ goto out;
};
- sb->st_mode = mode;
- sb->st_nlink = vap->va_nlink;
- sb->st_uid = vap->va_uid;
- sb->st_gid = vap->va_gid;
- sb->st_rdev = vap->va_rdev;
- sb->st_size = vap->va_size;
- sb->st_atimespec = vap->va_atime;
- sb->st_mtimespec = vap->va_mtime;
- sb->st_ctimespec = vap->va_ctime;
- sb->st_blksize = vap->va_blocksize;
- sb->st_flags = vap->va_flags;
+ if (isstat64 != 0) {
+ sb64->st_mode = mode;
+ sb64->st_nlink = VATTR_IS_SUPPORTED(&va, va_nlink) ? (u_int16_t)va.va_nlink : 1;
+ sb64->st_uid = va.va_uid;
+ sb64->st_gid = va.va_gid;
+ sb64->st_rdev = va.va_rdev;
+ sb64->st_size = va.va_data_size;
+ sb64->st_atimespec = va.va_access_time;
+ sb64->st_mtimespec = va.va_modify_time;
+ sb64->st_ctimespec = va.va_change_time;
+ sb64->st_birthtimespec =
+ VATTR_IS_SUPPORTED(&va, va_create_time) ? va.va_create_time : va.va_change_time;
+ sb64->st_blksize = va.va_iosize;
+ sb64->st_flags = va.va_flags;
+ sb64->st_blocks = roundup(va.va_total_alloc, 512) / 512;
+ } else {
+ sb->st_mode = mode;
+ sb->st_nlink = VATTR_IS_SUPPORTED(&va, va_nlink) ? (u_int16_t)va.va_nlink : 1;
+ sb->st_uid = va.va_uid;
+ sb->st_gid = va.va_gid;
+ sb->st_rdev = va.va_rdev;
+ sb->st_size = va.va_data_size;
+ sb->st_atimespec = va.va_access_time;
+ sb->st_mtimespec = va.va_modify_time;
+ sb->st_ctimespec = va.va_change_time;
+ sb->st_blksize = va.va_iosize;
+ sb->st_flags = va.va_flags;
+ sb->st_blocks = roundup(va.va_total_alloc, 512) / 512;
+ }
+
+ /* if we're interested in extended security data and we got an ACL */
+ if (xsec != NULL) {
+ if (!VATTR_IS_SUPPORTED(&va, va_acl) &&
+ !VATTR_IS_SUPPORTED(&va, va_uuuid) &&
+ !VATTR_IS_SUPPORTED(&va, va_guuid)) {
+ *xsec = KAUTH_FILESEC_NONE;
+ } else {
+
+ if (VATTR_IS_SUPPORTED(&va, va_acl) && (va.va_acl != NULL)) {
+ fsec = kauth_filesec_alloc(va.va_acl->acl_entrycount);
+ } else {
+ fsec = kauth_filesec_alloc(0);
+ }
+ if (fsec == NULL) {
+ error = ENOMEM;
+ goto out;
+ }
+ fsec->fsec_magic = KAUTH_FILESEC_MAGIC;
+ if (VATTR_IS_SUPPORTED(&va, va_uuuid)) {
+ fsec->fsec_owner = va.va_uuuid;
+ } else {
+ fsec->fsec_owner = kauth_null_guid;
+ }
+ if (VATTR_IS_SUPPORTED(&va, va_guuid)) {
+ fsec->fsec_group = va.va_guuid;
+ } else {
+ fsec->fsec_group = kauth_null_guid;
+ }
+ if (VATTR_IS_SUPPORTED(&va, va_acl) && (va.va_acl != NULL)) {
+ bcopy(va.va_acl, &(fsec->fsec_acl), KAUTH_ACL_COPYSIZE(va.va_acl));
+ } else {
+ fsec->fsec_acl.acl_entrycount = KAUTH_FILESEC_NOACL;
+ }
+ *xsec = fsec;
+ }
+ }
+
/* Do not give the generation number out to unpriviledged users */
- if (suser(p->p_ucred, &p->p_acflag))
- sb->st_gen = 0;
- else
- sb->st_gen = vap->va_gen;
- sb->st_blocks = vap->va_bytes / S_BLKSIZE;
- return (0);
+ if (va.va_gen && !vfs_context_issuser(ctx)) {
+ if (isstat64 != 0)
+ sb64->st_gen = 0;
+ else
+ sb->st_gen = 0;
+ } else {
+ if (isstat64 != 0)
+ sb64->st_gen = va.va_gen;
+ else
+ sb->st_gen = va.va_gen;
+ }
+
+ error = 0;
+out:
+ if (VATTR_IS_SUPPORTED(&va, va_acl) && va.va_acl != NULL)
+ kauth_acl_free(va.va_acl);
+ return (error);
}
+int
+vn_stat(struct vnode *vp, void *sb, kauth_filesec_t *xsec, int isstat64, vfs_context_t ctx)
+{
+ int error;
+
+#if CONFIG_MACF
+ error = mac_vnode_check_stat(ctx, NOCRED, vp);
+ if (error)
+ return (error);
+#endif
+
+ /* authorize */
+ if ((error = vnode_authorize(vp, NULL, KAUTH_VNODE_READ_ATTRIBUTES | KAUTH_VNODE_READ_SECURITY, ctx)) != 0)
+ return(error);
+
+ /* actual stat */
+ return(vn_stat_noauth(vp, sb, xsec, isstat64, ctx));
+}
+
+
/*
* File table vnode ioctl routine.
*/
static int
-vn_ioctl(fp, com, data, p)
- struct file *fp;
- u_long com;
- caddr_t data;
- struct proc *p;
+vn_ioctl(struct fileproc *fp, u_long com, caddr_t data, vfs_context_t ctx)
{
- register struct vnode *vp = ((struct vnode *)fp->f_data);
- struct vattr vattr;
+ struct vnode *vp = ((struct vnode *)fp->f_fglob->fg_data);
+ off_t file_size;
int error;
struct vnode *ttyvp;
+ struct session * sessp;
- switch (vp->v_type) {
+ if ( (error = vnode_getwithref(vp)) ) {
+ return(error);
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_ioctl(ctx, vp, com);
+ if (error)
+ goto out;
+#endif
+ switch (vp->v_type) {
case VREG:
case VDIR:
if (com == FIONREAD) {
- if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p))
- return (error);
- *(int *)data = vattr.va_size - fp->f_offset;
- return (0);
+ if ((error = vnode_size(vp, &file_size, ctx)) != 0)
+ goto out;
+ *(int *)data = file_size - fp->f_fglob->fg_offset;
+ goto out;
+ }
+ if (com == FIONBIO || com == FIOASYNC) { /* XXX */
+ goto out;
}
- if (com == FIONBIO || com == FIOASYNC) /* XXX */
- return (0); /* XXX */
/* fall into ... */
default:
- return (ENOTTY);
+ error = ENOTTY;
+ goto out;
case VFIFO:
case VCHR:
case VBLK:
- /* Should not be able to set block size from user space */
- if(com == DKIOCSETBLOCKSIZE)
- return (EPERM);
-
- if (com == FIODTYPE) {
- if (vp->v_type == VBLK) {
- if (major(vp->v_rdev) >= nblkdev)
- return (ENXIO);
- *(int *)data = bdevsw[major(vp->v_rdev)].d_type;
- } else if (vp->v_type == VCHR) {
- if (major(vp->v_rdev) >= nchrdev)
- return (ENXIO);
- *(int *)data = cdevsw[major(vp->v_rdev)].d_type;
- } else {
- return (ENOTTY);
- }
- return (0);
- }
- error = VOP_IOCTL(vp, com, data, fp->f_flag, p->p_ucred, p);
- if (error == 0 && com == TIOCSCTTY) {
- VREF(vp);
- ttyvp = p->p_session->s_ttyvp;
- p->p_session->s_ttyvp = vp;
- if (ttyvp)
- vrele(ttyvp);
- }
- return (error);
+ /* Should not be able to set block size from user space */
+ if (com == DKIOCSETBLOCKSIZE) {
+ error = EPERM;
+ goto out;
+ }
+
+ if (com == FIODTYPE) {
+ if (vp->v_type == VBLK) {
+ if (major(vp->v_rdev) >= nblkdev) {
+ error = ENXIO;
+ goto out;
+ }
+ *(int *)data = bdevsw[major(vp->v_rdev)].d_type;
+
+ } else if (vp->v_type == VCHR) {
+ if (major(vp->v_rdev) >= nchrdev) {
+ error = ENXIO;
+ goto out;
+ }
+ *(int *)data = cdevsw[major(vp->v_rdev)].d_type;
+ } else {
+ error = ENOTTY;
+ goto out;
+ }
+ goto out;
+ }
+ error = VNOP_IOCTL(vp, com, data, fp->f_fglob->fg_flag, ctx);
+
+ if (error == 0 && com == TIOCSCTTY) {
+ sessp = proc_session(vfs_context_proc(ctx));
+
+ session_lock(sessp);
+ ttyvp = sessp->s_ttyvp;
+ sessp->s_ttyvp = vp;
+ sessp->s_ttyvid = vnode_vid(vp);
+ session_unlock(sessp);
+ session_rele(sessp);
+ }
}
+out:
+ (void)vnode_put(vp);
+ return(error);
}
/*
* File table vnode select routine.
*/
static int
-vn_select(fp, which, wql, p)
- struct file *fp;
- int which;
- void * wql;
- struct proc *p;
+vn_select(struct fileproc *fp, int which, void *wql, __unused vfs_context_t ctx)
{
+ int error;
+ struct vnode * vp = (struct vnode *)fp->f_fglob->fg_data;
+ struct vfs_context context;
- return(VOP_SELECT(((struct vnode *)fp->f_data), which, fp->f_flag,
- fp->f_cred, wql, p));
+ if ( (error = vnode_getwithref(vp)) == 0 ) {
+ context.vc_thread = current_thread();
+ context.vc_ucred = fp->f_fglob->fg_cred;
+
+#if CONFIG_MACF
+ /*
+ * XXX We should use a per thread credential here; minimally,
+ * XXX the process credential should have a persistent
+ * XXX reference on it before being passed in here.
+ */
+ error = mac_vnode_check_select(ctx, vp, which);
+ if (error == 0)
+#endif
+ error = VNOP_SELECT(vp, which, fp->f_fglob->fg_flag, wql, ctx);
+
+ (void)vnode_put(vp);
+ }
+ return(error);
+
}
/*
- * Check that the vnode is still valid, and if so
- * acquire requested lock.
+ * File table vnode close routine.
+ */
+static int
+vn_closefile(struct fileglob *fg, vfs_context_t ctx)
+{
+ struct vnode *vp = (struct vnode *)fg->fg_data;
+ int error;
+ struct flock lf;
+
+ if ( (error = vnode_getwithref(vp)) == 0 ) {
+
+ if ((fg->fg_flag & FHASLOCK) &&
+ FILEGLOB_DTYPE(fg) == DTYPE_VNODE) {
+ lf.l_whence = SEEK_SET;
+ lf.l_start = 0;
+ lf.l_len = 0;
+ lf.l_type = F_UNLCK;
+
+ (void)VNOP_ADVLOCK(vp, (caddr_t)fg, F_UNLCK, &lf, F_FLOCK, ctx, NULL);
+ }
+ error = vn_close(vp, fg->fg_flag, ctx);
+
+ (void)vnode_put(vp);
+ }
+ return(error);
+}
+
+/*
+ * Returns: 0 Success
+ * VNOP_PATHCONF:???
*/
int
-vn_lock(vp, flags, p)
- struct vnode *vp;
- int flags;
- struct proc *p;
+vn_pathconf(vnode_t vp, int name, int32_t *retval, vfs_context_t ctx)
+{
+ int error = 0;
+ struct vfs_attr vfa;
+
+ switch(name) {
+ case _PC_EXTENDED_SECURITY_NP:
+ *retval = vfs_extendedsecurity(vnode_mount(vp)) ? 1 : 0;
+ break;
+ case _PC_AUTH_OPAQUE_NP:
+ *retval = vfs_authopaque(vnode_mount(vp));
+ break;
+ case _PC_2_SYMLINKS:
+ *retval = 1; /* XXX NOTSUP on MSDOS, etc. */
+ break;
+ case _PC_ALLOC_SIZE_MIN:
+ *retval = 1; /* XXX lie: 1 byte */
+ break;
+ case _PC_ASYNC_IO: /* unistd.h: _POSIX_ASYNCHRONUS_IO */
+ *retval = 1; /* [AIO] option is supported */
+ break;
+ case _PC_PRIO_IO: /* unistd.h: _POSIX_PRIORITIZED_IO */
+ *retval = 0; /* [PIO] option is not supported */
+ break;
+ case _PC_REC_INCR_XFER_SIZE:
+ *retval = 4096; /* XXX go from MIN to MAX 4K at a time */
+ break;
+ case _PC_REC_MIN_XFER_SIZE:
+ *retval = 4096; /* XXX recommend 4K minimum reads/writes */
+ break;
+ case _PC_REC_MAX_XFER_SIZE:
+ *retval = 65536; /* XXX recommend 64K maximum reads/writes */
+ break;
+ case _PC_REC_XFER_ALIGN:
+ *retval = 4096; /* XXX recommend page aligned buffers */
+ break;
+ case _PC_SYMLINK_MAX:
+ *retval = 255; /* Minimum acceptable POSIX value */
+ break;
+ case _PC_SYNC_IO: /* unistd.h: _POSIX_SYNCHRONIZED_IO */
+ *retval = 0; /* [SIO] option is not supported */
+ break;
+ case _PC_XATTR_SIZE_BITS:
+ /* The number of bits used to store maximum extended
+ * attribute size in bytes. For example, if the maximum
+ * attribute size supported by a file system is 128K, the
+ * value returned will be 18. However a value 18 can mean
+ * that the maximum attribute size can be anywhere from
+ * (256KB - 1) to 128KB. As a special case, the resource
+ * fork can have much larger size, and some file system
+ * specific extended attributes can have smaller and preset
+ * size; for example, Finder Info is always 32 bytes.
+ */
+ memset(&vfa, 0, sizeof(vfa));
+ VFSATTR_INIT(&vfa);
+ VFSATTR_WANTED(&vfa, f_capabilities);
+ if (vfs_getattr(vnode_mount(vp), &vfa, ctx) == 0 &&
+ (VFSATTR_IS_SUPPORTED(&vfa, f_capabilities)) &&
+ (vfa.f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_EXTENDED_ATTR) &&
+ (vfa.f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_EXTENDED_ATTR)) {
+ /* Supports native extended attributes */
+ error = VNOP_PATHCONF(vp, name, retval, ctx);
+ } else {
+ /* Number of bits used to represent the maximum size of
+ * extended attribute stored in an Apple Double file.
+ */
+ *retval = AD_XATTR_SIZE_BITS;
+ }
+ break;
+ default:
+ error = VNOP_PATHCONF(vp, name, retval, ctx);
+ break;
+ }
+
+ return (error);
+}
+
+static int
+vn_kqfilt_add(struct fileproc *fp, struct knote *kn, vfs_context_t ctx)
{
int error;
+ struct vnode *vp;
- do {
- if ((flags & LK_INTERLOCK) == 0)
- simple_lock(&vp->v_interlock);
- if (vp->v_flag & VXLOCK) {
- while (vp->v_flag & VXLOCK) {
- vp->v_flag |= VXWANT;
- simple_unlock(&vp->v_interlock);
- (void)tsleep((caddr_t)vp, PINOD, "vn_lock", 0);
- }
- error = ENOENT;
- } else {
- error = VOP_LOCK(vp, flags | LK_INTERLOCK, p);
- if (error == 0)
- return (error);
+ vp = (struct vnode *)fp->f_fglob->fg_data;
+
+ /*
+ * Don't attach a knote to a dead vnode.
+ */
+ if ((error = vget_internal(vp, 0, VNODE_NODEAD)) == 0) {
+ switch (kn->kn_filter) {
+ case EVFILT_READ:
+ case EVFILT_WRITE:
+ if (vnode_isfifo(vp)) {
+ /* We'll only watch FIFOs that use our fifofs */
+ if (!(vp->v_fifoinfo && vp->v_fifoinfo->fi_readsock)) {
+ error = ENOTSUP;
+ }
+
+ } else if (!vnode_isreg(vp)) {
+ if (vnode_ischr(vp) &&
+ (error = spec_kqfilter(vp, kn)) == 0) {
+ /* claimed by a special device */
+ vnode_put(vp);
+ return 0;
+ }
+
+ error = EINVAL;
+ }
+ break;
+ case EVFILT_VNODE:
+ break;
+ default:
+ error = EINVAL;
+ }
+
+ if (error) {
+ vnode_put(vp);
+ return error;
}
- flags &= ~LK_INTERLOCK;
- } while (flags & LK_RETRY);
+
+#if CONFIG_MACF
+ error = mac_vnode_check_kqfilter(ctx, fp->f_fglob->fg_cred, kn, vp);
+ if (error) {
+ vnode_put(vp);
+ return error;
+ }
+#endif
+
+ kn->kn_hook = (void*)vp;
+ kn->kn_hookid = vnode_vid(vp);
+ kn->kn_fop = &vnode_filtops;
+
+ vnode_lock(vp);
+ KNOTE_ATTACH(&vp->v_knotes, kn);
+ vnode_unlock(vp);
+
+ /* Ask the filesystem to provide remove notifications, but ignore failure */
+ VNOP_MONITOR(vp, 0, VNODE_MONITOR_BEGIN, (void*) kn, ctx);
+
+ vnode_put(vp);
+ }
+
return (error);
}
+static void
+filt_vndetach(struct knote *kn)
+{
+ vfs_context_t ctx = vfs_context_current();
+ struct vnode *vp;
+ vp = (struct vnode *)kn->kn_hook;
+ if (vnode_getwithvid(vp, kn->kn_hookid))
+ return;
+
+ vnode_lock(vp);
+ KNOTE_DETACH(&vp->v_knotes, kn);
+ vnode_unlock(vp);
+
+ /*
+ * Tell a (generally networked) filesystem that we're no longer watching
+ * If the FS wants to track contexts, it should still be using the one from
+ * the VNODE_MONITOR_BEGIN.
+ */
+ VNOP_MONITOR(vp, 0, VNODE_MONITOR_END, (void*)kn, ctx);
+ vnode_put(vp);
+}
+
+
/*
- * File table vnode close routine.
+ * Used for EVFILT_READ
+ *
+ * Takes only VFIFO or VREG. vnode is locked. We handle the "poll" case
+ * differently than the regular case for VREG files. If not in poll(),
+ * then we need to know current fileproc offset for VREG.
+ */
+static intptr_t
+vnode_readable_data_count(vnode_t vp, off_t current_offset, int ispoll)
+{
+ if (vnode_isfifo(vp)) {
+#if FIFO
+ int cnt;
+ int err = fifo_charcount(vp, &cnt);
+ if (err == 0) {
+ return (intptr_t)cnt;
+ } else
+#endif
+ {
+ return (intptr_t)0;
+ }
+ } else if (vnode_isreg(vp)) {
+ if (ispoll) {
+ return (intptr_t)1;
+ }
+
+ off_t amount;
+ amount = vp->v_un.vu_ubcinfo->ui_size - current_offset;
+ if (amount > (off_t)INTPTR_MAX) {
+ return INTPTR_MAX;
+ } else if (amount < (off_t)INTPTR_MIN) {
+ return INTPTR_MIN;
+ } else {
+ return (intptr_t)amount;
+ }
+ } else {
+ panic("Should never have an EVFILT_READ except for reg or fifo.");
+ return 0;
+ }
+}
+
+/*
+ * Used for EVFILT_WRITE.
+ *
+ * For regular vnodes, we can always write (1). For named pipes,
+ * see how much space there is in the buffer. Nothing else is covered.
+ */
+static intptr_t
+vnode_writable_space_count(vnode_t vp)
+{
+ if (vnode_isfifo(vp)) {
+#if FIFO
+ long spc;
+ int err = fifo_freespace(vp, &spc);
+ if (err == 0) {
+ return (intptr_t)spc;
+ } else
+#endif
+ {
+ return (intptr_t)0;
+ }
+ } else if (vnode_isreg(vp)) {
+ return (intptr_t)1;
+ } else {
+ panic("Should never have an EVFILT_READ except for reg or fifo.");
+ return 0;
+ }
+}
+
+/*
+ * Determine whether this knote should be active
+ *
+ * This is kind of subtle.
+ * --First, notice if the vnode has been revoked: in so, override hint
+ * --EVFILT_READ knotes are checked no matter what the hint is
+ * --Other knotes activate based on hint.
+ * --If hint is revoke, set special flags and activate
*/
static int
-vn_closefile(fp, p)
- struct file *fp;
- struct proc *p;
+filt_vnode(struct knote *kn, long hint)
{
+ vnode_t vp = (struct vnode *)kn->kn_hook;
+ int activate = 0;
+ long orig_hint = hint;
+
+ if (0 == hint) {
+ vnode_lock(vp);
+
+ if (vnode_getiocount(vp, kn->kn_hookid, VNODE_NODEAD | VNODE_WITHID) != 0) {
+ /* Is recycled */
+ hint = NOTE_REVOKE;
+ }
+ } else {
+ lck_mtx_assert(&vp->v_lock, LCK_MTX_ASSERT_OWNED);
+ }
+
+ /* Special handling for vnodes that are in recycle or already gone */
+ if (NOTE_REVOKE == hint) {
+ kn->kn_flags |= (EV_EOF | EV_ONESHOT);
+ activate = 1;
+
+ if ((kn->kn_filter == EVFILT_VNODE) && (kn->kn_sfflags & NOTE_REVOKE)) {
+ kn->kn_fflags |= NOTE_REVOKE;
+ }
+ } else {
+ switch(kn->kn_filter) {
+ case EVFILT_READ:
+ kn->kn_data = vnode_readable_data_count(vp, kn->kn_fp->f_fglob->fg_offset, (kn->kn_flags & EV_POLL));
+
+ if (kn->kn_data != 0) {
+ activate = 1;
+ }
+ break;
+ case EVFILT_WRITE:
+ kn->kn_data = vnode_writable_space_count(vp);
+
+ if (kn->kn_data != 0) {
+ activate = 1;
+ }
+ break;
+ case EVFILT_VNODE:
+ /* Check events this note matches against the hint */
+ if (kn->kn_sfflags & hint) {
+ kn->kn_fflags |= hint; /* Set which event occurred */
+ }
+ if (kn->kn_fflags != 0) {
+ activate = 1;
+ }
+ break;
+ default:
+ panic("Invalid knote filter on a vnode!\n");
+ }
+ }
+
+ if (orig_hint == 0) {
+ /*
+ * Definitely need to unlock, may need to put
+ */
+ if (hint == 0) {
+ vnode_put_locked(vp);
+ }
+ vnode_unlock(vp);
+ }
- return (vn_close(((struct vnode *)fp->f_data), fp->f_flag,
- fp->f_cred, p));
+ return (activate);
}
projects / apple / xnu.git / blobdiff