xnu-792.17.14.tar.gz

[apple/xnu.git] / bsd / hfs / hfs_vnops.c

/*
 * Copyright (c) 2000-2005 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. 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
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/file_internal.h>
#include <sys/dirent.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/mount.h>
#include <sys/vnode_internal.h>
#include <sys/malloc.h>
#include <sys/ubc.h>
#include <sys/paths.h>
#include <sys/quota.h>
#include <sys/time.h>
#include <sys/disk.h>
#include <sys/kauth.h>
#include <sys/uio_internal.h>

#include <miscfs/specfs/specdev.h>
#include <miscfs/fifofs/fifo.h>
#include <vfs/vfs_support.h>
#include <machine/spl.h>

#include <sys/kdebug.h>
#include <sys/sysctl.h>

#include "hfs.h"
#include "hfs_catalog.h"
#include "hfs_cnode.h"
#include "hfs_dbg.h"
#include "hfs_mount.h"
#include "hfs_quota.h"
#include "hfs_endian.h"

#include "hfscommon/headers/BTreesInternal.h"
#include "hfscommon/headers/FileMgrInternal.h"

#define MAKE_DELETED_NAME(NAME,FID) \
            (void) sprintf((NAME), "%s%d", HFS_DELETE_PREFIX, (FID))

#define KNDETACH_VNLOCKED 0x00000001

#define CARBON_TEMP_DIR_NAME    "Cleanup At Startup"


/* Global vfs data structures for hfs */

/* Always F_FULLFSYNC? 1=yes,0=no (default due to "various" reasons is 'no') */
int always_do_fullfsync = 0;
SYSCTL_INT (_kern, OID_AUTO, always_do_fullfsync, CTLFLAG_RW, &always_do_fullfsync, 0, "always F_FULLFSYNC when fsync is called");

extern unsigned long strtoul(const char *, char **, int);

static int hfs_makenode(struct vnode *dvp, struct vnode **vpp,
                        struct componentname *cnp, struct vnode_attr *vap,
                        vfs_context_t ctx);

static int hfs_metasync(struct hfsmount *hfsmp, daddr64_t node, struct proc *p);

static int hfs_removedir(struct vnode *, struct vnode *, struct componentname *,
                         int);

static int hfs_removefile(struct vnode *, struct vnode *, struct componentname *,
                          int, int);

static int hfs_vnop_close(struct vnop_close_args*);
static int hfs_vnop_create(struct vnop_create_args*);
static int hfs_vnop_exchange(struct vnop_exchange_args*);
static int hfs_vnop_fsync(struct vnop_fsync_args*);
static int hfs_vnop_mkdir(struct vnop_mkdir_args*);
static int hfs_vnop_mknod(struct vnop_mknod_args*);
static int hfs_vnop_getattr(struct vnop_getattr_args*);
static int hfs_vnop_open(struct vnop_open_args*);
static int hfs_vnop_readdir(struct vnop_readdir_args*);
static int hfs_vnop_remove(struct vnop_remove_args*);
static int hfs_vnop_rename(struct vnop_rename_args*);
static int hfs_vnop_rmdir(struct vnop_rmdir_args*);
static int hfs_vnop_symlink(struct vnop_symlink_args*);
static int hfs_vnop_setattr(struct vnop_setattr_args*);

/* Options for hfs_removedir and hfs_removefile */
#define HFSRM_SKIP_RESERVE  0x01


int hfs_write_access(struct vnode *vp, kauth_cred_t cred, struct proc *p, Boolean considerFlags);

int hfs_chmod(struct vnode *vp, int mode, kauth_cred_t cred,
                        struct proc *p);
int hfs_chown(struct vnode *vp, uid_t uid, gid_t gid,
                        kauth_cred_t cred, struct proc *p);

/*****************************************************************************
*
* Common Operations on vnodes
*
*****************************************************************************/

/*
 * Create a regular file.
 */
static int
hfs_vnop_create(struct vnop_create_args *ap)
{
        return hfs_makenode(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap, ap->a_context);
}

/*
 * Make device special file.
 */
static int
hfs_vnop_mknod(struct vnop_mknod_args *ap)
{
        struct vnode_attr *vap = ap->a_vap;
        struct vnode *dvp = ap->a_dvp;
        struct vnode **vpp = ap->a_vpp;
        struct cnode *cp;
        int error;

        if (VTOVCB(dvp)->vcbSigWord != kHFSPlusSigWord) {
                return (ENOTSUP);
        }

        /* Create the vnode */
        error = hfs_makenode(dvp, vpp, ap->a_cnp, vap, ap->a_context);
        if (error)
                return (error);

        cp = VTOC(*vpp);
        cp->c_touch_acctime = TRUE;
        cp->c_touch_chgtime = TRUE;
        cp->c_touch_modtime = TRUE;

        if ((vap->va_rdev != VNOVAL) &&
            (vap->va_type == VBLK || vap->va_type == VCHR))
                cp->c_rdev = vap->va_rdev;

        return (0);
}

/*
 * Open a file/directory.
 */
static int
hfs_vnop_open(struct vnop_open_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct filefork *fp;
        struct timeval tv;
        int error;

        /*
         * Files marked append-only must be opened for appending.
         */
        if ((VTOC(vp)->c_flags & APPEND) && !vnode_isdir(vp) &&
            (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
                return (EPERM);

        if (vnode_isreg(vp) && !UBCINFOEXISTS(vp))
                return (EBUSY);  /* file is in use by the kernel */

        /* Don't allow journal file to be opened externally. */
        if (VTOC(vp)->c_fileid == VTOHFS(vp)->hfs_jnlfileid)
                return (EPERM);
        /*
         * On the first (non-busy) open of a fragmented
         * file attempt to de-frag it (if its less than 20MB).
         */
        if ((VTOHFS(vp)->hfs_flags & HFS_READ_ONLY) ||
            (VTOHFS(vp)->jnl == NULL) ||
            !vnode_isreg(vp) || vnode_isinuse(vp, 0)) {
                return (0);
        }

        if ((error = hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK)))
                return (error);
        fp = VTOF(vp);
        if (fp->ff_blocks &&
            fp->ff_extents[7].blockCount != 0 &&
            fp->ff_size <= (20 * 1024 * 1024)) {
                /* 
                 * Wait until system bootup is done (3 min).
                 */
                microuptime(&tv);
                if (tv.tv_sec > (60 * 3)) {
                        (void) hfs_relocate(vp, VTOVCB(vp)->nextAllocation + 4096,
                                            vfs_context_ucred(ap->a_context),
                                            vfs_context_proc(ap->a_context));
                }
        }
        hfs_unlock(VTOC(vp));

        return (0);
}


/*
 * Close a file/directory.
 */
static int
hfs_vnop_close(ap)
        struct vnop_close_args /* {
                struct vnode *a_vp;
                int a_fflag;
                vfs_context_t a_context;
        } */ *ap;
{
        register struct vnode *vp = ap->a_vp;
        register struct cnode *cp;
        struct proc *p = vfs_context_proc(ap->a_context);
        struct hfsmount *hfsmp;
        int busy;

        if ( hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK) != 0)
                return (0);
        cp = VTOC(vp);
        hfsmp = VTOHFS(vp);

        // if we froze the fs and we're exiting, then "thaw" the fs 
        if (hfsmp->hfs_freezing_proc == p && proc_exiting(p)) {
            hfsmp->hfs_freezing_proc = NULL;
            hfs_global_exclusive_lock_release(hfsmp);
            lck_rw_unlock_exclusive(&hfsmp->hfs_insync);
        }

        busy = vnode_isinuse(vp, 1);

        if (busy) {
                hfs_touchtimes(VTOHFS(vp), cp); 
        }
        if (vnode_isdir(vp)) {
                hfs_reldirhints(cp, busy);
        } else if (vnode_issystem(vp) && !busy) {
                vnode_recycle(vp);
        }

        hfs_unlock(cp);
        return (0);
}

/*
 * Get basic attributes.
 */
static int
hfs_vnop_getattr(struct vnop_getattr_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct vnode_attr *vap = ap->a_vap;
        struct vnode *rvp = NULL;
        struct hfsmount *hfsmp;
        struct cnode *cp;
        enum vtype v_type;
        int error = 0;

        if ((error = hfs_lock(VTOC(vp), HFS_SHARED_LOCK))) {
                return (error);
        }
        cp = VTOC(vp);
        hfsmp = VTOHFS(vp);
        hfs_touchtimes(hfsmp, cp);
        v_type = vnode_vtype(vp);

        VATTR_RETURN(vap, va_rdev, (v_type == VBLK || v_type == VCHR) ? cp->c_rdev : 0);
        if (v_type == VDIR) {
                if (VATTR_IS_ACTIVE(vap, va_nlink)) {
                        int entries;
        
                        entries = cp->c_nlink;
                        if (vnode_isvroot(vp)) {
                                if (hfsmp->hfs_privdir_desc.cd_cnid != 0)
                                        --entries;     /* hide private dir */
                                if (hfsmp->jnl || ((HFSTOVCB(hfsmp)->vcbAtrb & kHFSVolumeJournaledMask) && (hfsmp->hfs_flags & HFS_READ_ONLY)))
                                        entries -= 2;  /* hide the journal files */
                        }
                        VATTR_RETURN(vap, va_nlink, (uint64_t)entries);
                }
                
                if (VATTR_IS_ACTIVE(vap, va_nchildren)) {
                        int entries;
        
                        entries = cp->c_entries;
                        if (vnode_isvroot(vp)) {
                                if (hfsmp->hfs_privdir_desc.cd_cnid != 0)
                                        --entries;     /* hide private dir */
                                if (hfsmp->jnl)
                                        entries -= 2;  /* hide the journal files */
                        }
                        VATTR_RETURN(vap, va_nchildren, entries);
                }
        } else {
                VATTR_RETURN(vap, va_nlink, (uint64_t)cp->c_nlink);
        }

        /* conditional because 64-bit arithmetic can be expensive */
        if (VATTR_IS_ACTIVE(vap, va_total_size)) {
                if (v_type == VDIR) {
                        VATTR_RETURN(vap, va_total_size, cp->c_nlink * AVERAGE_HFSDIRENTRY_SIZE);
                } else {
                        uint64_t total_size = 0;
                        struct cnode *rcp;
                        
                        if (cp->c_datafork) {
                                total_size = cp->c_datafork->ff_size;
                        }

                        if (cp->c_blocks - VTOF(vp)->ff_blocks) {
                                /* hfs_vgetrsrc does not use struct proc - therefore passing NULL */ 
                                error = hfs_vgetrsrc(hfsmp, vp, &rvp, NULL);
                                if (error) {
                                        goto out;
                                }
                
                                rcp = VTOC(rvp);
                                if (rcp && rcp->c_rsrcfork) {
                                        total_size += rcp->c_rsrcfork->ff_size;
                                }
                        }

                        VATTR_RETURN(vap, va_total_size, total_size);
                        /* Include size of attibute data (extents), if any */
                        if (cp->c_attrblks) {
                                vap->va_total_size += (uint64_t)cp->c_attrblks * (uint64_t)hfsmp->blockSize;
                        }
                }
        }
        if (VATTR_IS_ACTIVE(vap, va_total_alloc)) {
                if (v_type == VDIR) {
                        VATTR_RETURN(vap, va_total_alloc, 0);
                } else {
                        VATTR_RETURN(vap, va_total_alloc, (uint64_t)cp->c_blocks * (uint64_t)hfsmp->blockSize);
                        /* Include size of attibute data (extents), if any */
                        if (cp->c_attrblks) {
                                vap->va_total_alloc += (uint64_t)cp->c_attrblks * (uint64_t)hfsmp->blockSize;
                        }
                }
        }
        /* XXX broken... if ask for "data size" of rsrc fork vp you get rsrc fork size! */
        if (v_type == VDIR) {
                VATTR_RETURN(vap, va_data_size, cp->c_nlink * AVERAGE_HFSDIRENTRY_SIZE);
        } else {
                VATTR_RETURN(vap, va_data_size, VTOF(vp)->ff_size);
        }       
        if (VATTR_IS_ACTIVE(vap, va_data_alloc) && (v_type != VDIR)) {
                        /* XXX do we need to account for ff_unallocblocks ? */
                VATTR_RETURN(vap, va_data_alloc, (uint64_t)VTOF(vp)->ff_blocks * (uint64_t)hfsmp->blockSize);
        }
        /* XXX is this really a good 'optimal I/O size'? */
        VATTR_RETURN(vap, va_iosize, hfsmp->hfs_logBlockSize);
        VATTR_RETURN(vap, va_uid, cp->c_uid);
        VATTR_RETURN(vap, va_gid, cp->c_gid);
        VATTR_RETURN(vap, va_mode, cp->c_mode);
#if 0
        /* XXX is S_IFXATTR still needed ??? */
        if (VNODE_IS_RSRC(vp))
                vap->va_mode |= S_IFXATTR;
#endif
        VATTR_RETURN(vap, va_flags, cp->c_flags);

        /*
         * If the VFS wants extended security data, and we know that we
         * don't have any (because it never told us it was setting any)
         * then we can return the supported bit and no data.  If we do
         * have extended security, we can just leave the bit alone and
         * the VFS will use the fallback path to fetch it.
         */
        if (VATTR_IS_ACTIVE(vap, va_acl)) {
                if ((cp->c_attr.ca_recflags & kHFSHasSecurityMask) == 0) {
                        vap->va_acl = KAUTH_FILESEC_NONE;
                        VATTR_SET_SUPPORTED(vap, va_acl);
                }
        }
        vap->va_create_time.tv_sec = cp->c_itime;
        vap->va_create_time.tv_nsec = 0;
        VATTR_SET_SUPPORTED(vap, va_create_time);

        if (VATTR_IS_ACTIVE(vap, va_access_time)) {
                /* Access times are lazyily updated, get current time if needed */
                if (cp->c_touch_acctime) {
                        struct timeval tv;
        
                        microtime(&tv);
                        vap->va_access_time.tv_sec = tv.tv_sec;
                } else {
                        vap->va_access_time.tv_sec = cp->c_atime;
                }
                vap->va_access_time.tv_nsec = 0;
                VATTR_SET_SUPPORTED(vap, va_access_time);
        }
        vap->va_modify_time.tv_sec = cp->c_mtime;
        vap->va_modify_time.tv_nsec = 0;
        VATTR_SET_SUPPORTED(vap, va_modify_time);
        vap->va_change_time.tv_sec = cp->c_ctime;
        vap->va_change_time.tv_nsec = 0;
        VATTR_SET_SUPPORTED(vap, va_change_time);
        vap->va_backup_time.tv_sec = cp->c_btime;
        vap->va_backup_time.tv_nsec = 0;
        VATTR_SET_SUPPORTED(vap, va_backup_time);

        /*
         * Exporting file IDs from HFS Plus:
         *
         * For "normal" files the c_fileid is the same value as the
         * c_cnid.  But for hard link files, they are different - the
         * c_cnid belongs to the active directory entry (ie the link)
         * and the c_fileid is for the actual inode (ie the data file).
         *
         * The stat call (getattr) uses va_fileid and the Carbon APIs,
         * which are hardlink-ignorant, will ask for va_linkid.
         */
        VATTR_RETURN(vap, va_fileid, (uint64_t)cp->c_fileid);
        VATTR_RETURN(vap, va_linkid, (uint64_t)cp->c_cnid);
        VATTR_RETURN(vap, va_parentid, (uint64_t)cp->c_parentcnid);
        VATTR_RETURN(vap, va_fsid, cp->c_dev);
        VATTR_RETURN(vap, va_filerev, 0);

        VATTR_RETURN(vap, va_encoding, cp->c_encoding);

        /* if this is the root, let VFS to find out the mount name, which may be different from the real name */
        if (VATTR_IS_ACTIVE(vap, va_name) && !vnode_isvroot(vp)) {
                /* Return the name for ATTR_CMN_NAME */
                if (cp->c_desc.cd_namelen == 0) {
                        error = ENOENT;
                        goto out;
                }
                
                strncpy(vap->va_name, cp->c_desc.cd_nameptr, MAXPATHLEN);
                vap->va_name[MAXPATHLEN-1] = '\0';
                VATTR_SET_SUPPORTED(vap, va_name);
        }

out:
        hfs_unlock(cp);
        if (rvp) {
                vnode_put(rvp);
        }
        return (error);
}

static int
hfs_vnop_setattr(ap)
        struct vnop_setattr_args /* {
                struct vnode *a_vp;
                struct vnode_attr *a_vap;
                vfs_context_t a_context;
        } */ *ap;
{
        struct vnode_attr *vap = ap->a_vap;
        struct vnode *vp = ap->a_vp;
        struct cnode *cp = NULL;
        struct hfsmount *hfsmp;
        kauth_cred_t cred = vfs_context_ucred(ap->a_context);
        struct proc *p = vfs_context_proc(ap->a_context);
        int error = 0;
        uid_t nuid;
        gid_t ngid;

        hfsmp = VTOHFS(vp);

        /* Don't allow modification of the journal file. */
        if (hfsmp->hfs_jnlfileid == VTOC(vp)->c_fileid) {
                return (EPERM);
        }

        /*
         * File size change request.
         * We are guaranteed that this is not a directory, and that
         * the filesystem object is writeable.
         */
        VATTR_SET_SUPPORTED(vap, va_data_size);
        if (VATTR_IS_ACTIVE(vap, va_data_size) && !vnode_islnk(vp)) {

                /* Take truncate lock before taking cnode lock. */
                hfs_lock_truncate(VTOC(vp), TRUE);
                if ((error = hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK))) {
                        hfs_unlock_truncate(VTOC(vp));
                        return (error);
                }
                cp = VTOC(vp);

                error = hfs_truncate(vp, vap->va_data_size, vap->va_vaflags & 0xffff, 0, ap->a_context);

                hfs_unlock_truncate(cp);
                if (error)
                        goto out;
        }
        if (cp == NULL) {
                if ((error = hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK)))
                        return (error);
                cp = VTOC(vp);
        }

        /*
         * Owner/group change request.
         * We are guaranteed that the new owner/group is valid and legal.
         */
        VATTR_SET_SUPPORTED(vap, va_uid);
        VATTR_SET_SUPPORTED(vap, va_gid);
        nuid = VATTR_IS_ACTIVE(vap, va_uid) ? vap->va_uid : (uid_t)VNOVAL;
        ngid = VATTR_IS_ACTIVE(vap, va_gid) ? vap->va_gid : (gid_t)VNOVAL;
        if (((nuid != (uid_t)VNOVAL) || (ngid != (gid_t)VNOVAL)) &&
            ((error = hfs_chown(vp, nuid, ngid, cred, p)) != 0))
                goto out;

        /*
         * Mode change request.
         * We are guaranteed that the mode value is valid and that in
         * conjunction with the owner and group, this change is legal.
         */
        VATTR_SET_SUPPORTED(vap, va_mode);
        if (VATTR_IS_ACTIVE(vap, va_mode) &&
            ((error = hfs_chmod(vp, (int)vap->va_mode, cred, p)) != 0))
            goto out;

        /*
         * File flags change.
         * We are guaranteed that only flags allowed to change given the
         * current securelevel are being changed.
         */
        VATTR_SET_SUPPORTED(vap, va_flags);
        if (VATTR_IS_ACTIVE(vap, va_flags)) {
                cp->c_flags = vap->va_flags;
                cp->c_touch_chgtime = TRUE;
        }

        /*
         * If the file's extended security data is being changed, we
         * need to note the change.  Note that because we don't store
         * the data, we do not set the SUPPORTED bit; this will cause
         * the VFS to use a fallback strategy.
         */
        if (VATTR_IS_ACTIVE(vap, va_acl)) {
                /* Remember if any ACL data was set or cleared. */
                if (vap->va_acl == NULL) {
                        /* being cleared */
                        if (cp->c_attr.ca_recflags & kHFSHasSecurityMask) {
                                cp->c_attr.ca_recflags &= ~kHFSHasSecurityMask;
                                cp->c_touch_chgtime = TRUE;
                        }
                } else {
                        /* being set */
                        if ((cp->c_attr.ca_recflags & kHFSHasSecurityMask) == 0) {
                                cp->c_attr.ca_recflags |= kHFSHasSecurityMask;
                                cp->c_touch_chgtime = TRUE;
                        }
                }
        }

        /*
         * Timestamp updates.
         */
        VATTR_SET_SUPPORTED(vap, va_create_time);
        VATTR_SET_SUPPORTED(vap, va_access_time);
        VATTR_SET_SUPPORTED(vap, va_modify_time);
        VATTR_SET_SUPPORTED(vap, va_backup_time);
        VATTR_SET_SUPPORTED(vap, va_change_time);
        if (VATTR_IS_ACTIVE(vap, va_create_time) ||
            VATTR_IS_ACTIVE(vap, va_access_time) ||
            VATTR_IS_ACTIVE(vap, va_modify_time) ||
            VATTR_IS_ACTIVE(vap, va_backup_time)) {
                if (vnode_islnk(vp))
                        goto done;
                if (VATTR_IS_ACTIVE(vap, va_create_time))
                        cp->c_itime = vap->va_create_time.tv_sec;
                if (VATTR_IS_ACTIVE(vap, va_access_time)) {
                        cp->c_atime = vap->va_access_time.tv_sec;
                        cp->c_touch_acctime = FALSE;
                }
                if (VATTR_IS_ACTIVE(vap, va_modify_time)) {
                        cp->c_mtime = vap->va_modify_time.tv_sec;
                        cp->c_touch_modtime = FALSE;
                        cp->c_touch_chgtime = TRUE;

                        /*
                         * The utimes system call can reset the modification
                         * time but it doesn't know about HFS create times.
                         * So we need to ensure that the creation time is
                         * always at least as old as the modification time.
                         */
                        if ((VTOVCB(vp)->vcbSigWord == kHFSPlusSigWord) &&
                            (cp->c_cnid != kHFSRootFolderID) &&
                            (cp->c_mtime < cp->c_itime)) {
                                cp->c_itime = cp->c_mtime;
                        }
                }
                if (VATTR_IS_ACTIVE(vap, va_backup_time))
                        cp->c_btime = vap->va_backup_time.tv_sec;
                cp->c_flag |= C_MODIFIED;
        }
        
        /*
         * Set name encoding.
         */
        VATTR_SET_SUPPORTED(vap, va_encoding);
        if (VATTR_IS_ACTIVE(vap, va_encoding)) {
                cp->c_encoding = vap->va_encoding;
                hfs_setencodingbits(hfsmp, cp->c_encoding);
        }

done:
        if ((error = hfs_update(vp, TRUE)) != 0)
            goto out;
        HFS_KNOTE(vp, NOTE_ATTRIB);
out:
        if (cp)
                hfs_unlock(cp);
        return (error);
}


/*
 * Change the mode on a file.
 * cnode must be locked before calling.
 */
__private_extern__
int
hfs_chmod(struct vnode *vp, int mode, kauth_cred_t cred, struct proc *p)
{
        register struct cnode *cp = VTOC(vp);
        int error;

        if (VTOVCB(vp)->vcbSigWord != kHFSPlusSigWord)
                return (0);

        // XXXdbg - don't allow modification of the journal or journal_info_block
        if (VTOHFS(vp)->jnl && cp && cp->c_datafork) {
                struct HFSPlusExtentDescriptor *extd;

                extd = &cp->c_datafork->ff_extents[0];
                if (extd->startBlock == VTOVCB(vp)->vcbJinfoBlock || extd->startBlock == VTOHFS(vp)->jnl_start) {
                        return EPERM;
                }
        }

#if OVERRIDE_UNKNOWN_PERMISSIONS
        if (((unsigned int)vfs_flags(VTOVFS(vp))) & MNT_UNKNOWNPERMISSIONS) {
                return (0);
        };
#endif
        cp->c_mode &= ~ALLPERMS;
        cp->c_mode |= (mode & ALLPERMS);
        cp->c_touch_chgtime = TRUE;
        return (0);
}


__private_extern__
int
hfs_write_access(struct vnode *vp, kauth_cred_t cred, struct proc *p, Boolean considerFlags)
{
        struct cnode *cp = VTOC(vp);
        int retval = 0;
        int is_member;

        /*
         * Disallow write attempts on read-only file systems;
         * unless the file is a socket, fifo, or a block or
         * character device resident on the file system.
         */
        switch (vnode_vtype(vp)) {
        case VDIR:
        case VLNK:
        case VREG:
                if (VTOHFS(vp)->hfs_flags & HFS_READ_ONLY)
                        return (EROFS);
                break;
        default:
                break;
        }
 
        /* If immutable bit set, nobody gets to write it. */
        if (considerFlags && (cp->c_flags & IMMUTABLE))
                return (EPERM);

        /* Otherwise, user id 0 always gets access. */
        if (!suser(cred, NULL))
                return (0);

        /* Otherwise, check the owner. */
        if ((retval = hfs_owner_rights(VTOHFS(vp), cp->c_uid, cred, p, false)) == 0)
                return ((cp->c_mode & S_IWUSR) == S_IWUSR ? 0 : EACCES);
 
        /* Otherwise, check the groups. */
        if (kauth_cred_ismember_gid(cred, cp->c_gid, &is_member) == 0 && is_member) {
                return ((cp->c_mode & S_IWGRP) == S_IWGRP ? 0 : EACCES);
        }
 
        /* Otherwise, check everyone else. */
        return ((cp->c_mode & S_IWOTH) == S_IWOTH ? 0 : EACCES);
}


/*
 * Perform chown operation on cnode cp;
 * code must be locked prior to call.
 */
__private_extern__
int
hfs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred,
        struct proc *p)
{
        register struct cnode *cp = VTOC(vp);
        uid_t ouid;
        gid_t ogid;
        int error = 0;
        int is_member;
#if QUOTA
        register int i;
        int64_t change;
#endif /* QUOTA */

        if (VTOVCB(vp)->vcbSigWord != kHFSPlusSigWord)
                return (ENOTSUP);

        if (((unsigned int)vfs_flags(VTOVFS(vp))) & MNT_UNKNOWNPERMISSIONS)
                return (0);
        
        if (uid == (uid_t)VNOVAL)
                uid = cp->c_uid;
        if (gid == (gid_t)VNOVAL)
                gid = cp->c_gid;

#if 0   /* we are guaranteed that this is already the case */
        /*
         * If we don't own the file, are trying to change the owner
         * of the file, or are not a member of the target group,
         * the caller must be superuser or the call fails.
         */
        if ((kauth_cred_getuid(cred) != cp->c_uid || uid != cp->c_uid ||
            (gid != cp->c_gid &&
             (kauth_cred_ismember_gid(cred, gid, &is_member) || !is_member))) &&
            (error = suser(cred, 0)))
                return (error);
#endif

        ogid = cp->c_gid;
        ouid = cp->c_uid;
#if QUOTA
        if ((error = hfs_getinoquota(cp)))
                return (error);
        if (ouid == uid) {
                dqrele(cp->c_dquot[USRQUOTA]);
                cp->c_dquot[USRQUOTA] = NODQUOT;
        }
        if (ogid == gid) {
                dqrele(cp->c_dquot[GRPQUOTA]);
                cp->c_dquot[GRPQUOTA] = NODQUOT;
        }

        /*
         * Eventually need to account for (fake) a block per directory
         * if (vnode_isdir(vp))
         *     change = VTOHFS(vp)->blockSize;
         * else
         */

        change = (int64_t)(cp->c_blocks) * (int64_t)VTOVCB(vp)->blockSize;
        (void) hfs_chkdq(cp, -change, cred, CHOWN);
        (void) hfs_chkiq(cp, -1, cred, CHOWN);
        for (i = 0; i < MAXQUOTAS; i++) {
                dqrele(cp->c_dquot[i]);
                cp->c_dquot[i] = NODQUOT;
        }
#endif /* QUOTA */
        cp->c_gid = gid;
        cp->c_uid = uid;
#if QUOTA
        if ((error = hfs_getinoquota(cp)) == 0) {
                if (ouid == uid) {
                        dqrele(cp->c_dquot[USRQUOTA]);
                        cp->c_dquot[USRQUOTA] = NODQUOT;
                }
                if (ogid == gid) {
                        dqrele(cp->c_dquot[GRPQUOTA]);
                        cp->c_dquot[GRPQUOTA] = NODQUOT;
                }
                if ((error = hfs_chkdq(cp, change, cred, CHOWN)) == 0) {
                        if ((error = hfs_chkiq(cp, 1, cred, CHOWN)) == 0)
                                goto good;
                        else
                                (void) hfs_chkdq(cp, -change, cred, CHOWN|FORCE);
                }
                for (i = 0; i < MAXQUOTAS; i++) {
                        dqrele(cp->c_dquot[i]);
                        cp->c_dquot[i] = NODQUOT;
                }
        }
        cp->c_gid = ogid;
        cp->c_uid = ouid;
        if (hfs_getinoquota(cp) == 0) {
                if (ouid == uid) {
                        dqrele(cp->c_dquot[USRQUOTA]);
                        cp->c_dquot[USRQUOTA] = NODQUOT;
                }
                if (ogid == gid) {
                        dqrele(cp->c_dquot[GRPQUOTA]);
                        cp->c_dquot[GRPQUOTA] = NODQUOT;
                }
                (void) hfs_chkdq(cp, change, cred, FORCE|CHOWN);
                (void) hfs_chkiq(cp, 1, cred, FORCE|CHOWN);
                (void) hfs_getinoquota(cp);
        }
        return (error);
good:
        if (hfs_getinoquota(cp))
                panic("hfs_chown: lost quota");
#endif /* QUOTA */

        if (ouid != uid || ogid != gid)
                cp->c_touch_chgtime = TRUE;
        return (0);
}


/*
 * The hfs_exchange routine swaps the fork data in two files by
 * exchanging some of the information in the cnode.  It is used
 * to preserve the file ID when updating an existing file, in
 * case the file is being tracked through its file ID. Typically
 * its used after creating a new file during a safe-save.
 */
static int
hfs_vnop_exchange(ap)
        struct vnop_exchange_args /* {
                struct vnode *a_fvp;
                struct vnode *a_tvp;
                int a_options;
                vfs_context_t a_context;
        } */ *ap;
{
        struct vnode *from_vp = ap->a_fvp;
        struct vnode *to_vp = ap->a_tvp;
        struct cnode *from_cp;
        struct cnode *to_cp;
        struct hfsmount *hfsmp;
        struct cat_desc tempdesc;
        struct cat_attr tempattr;
        int lockflags;
        int error = 0, started_tr = 0, got_cookie = 0;
        cat_cookie_t cookie;

        /* The files must be on the same volume. */
        if (vnode_mount(from_vp) != vnode_mount(to_vp))
                return (EXDEV);

        if (from_vp == to_vp)
                return (EINVAL);

        if ((error = hfs_lockpair(VTOC(from_vp), VTOC(to_vp), HFS_EXCLUSIVE_LOCK)))
                return (error);

        from_cp = VTOC(from_vp);
        to_cp = VTOC(to_vp);
        hfsmp = VTOHFS(from_vp);

        /* Only normal files can be exchanged. */
        if (!vnode_isreg(from_vp) || !vnode_isreg(to_vp) ||
            (from_cp->c_flag & C_HARDLINK) || (to_cp->c_flag & C_HARDLINK) ||
            VNODE_IS_RSRC(from_vp) || VNODE_IS_RSRC(to_vp)) {
                error = EINVAL;
                goto exit;
        }

        // XXXdbg - don't allow modification of the journal or journal_info_block
        if (hfsmp->jnl) {
                struct HFSPlusExtentDescriptor *extd;

                if (from_cp->c_datafork) {
                        extd = &from_cp->c_datafork->ff_extents[0];
                        if (extd->startBlock == VTOVCB(from_vp)->vcbJinfoBlock || extd->startBlock == hfsmp->jnl_start) {
                                error = EPERM;
                                goto exit;
                        }
                }

                if (to_cp->c_datafork) {
                        extd = &to_cp->c_datafork->ff_extents[0];
                        if (extd->startBlock == VTOVCB(to_vp)->vcbJinfoBlock || extd->startBlock == hfsmp->jnl_start) {
                                error = EPERM;
                                goto exit;
                        }
                }
        }

        if ((error = hfs_start_transaction(hfsmp)) != 0) {
            goto exit;
        }
        started_tr = 1;
        
        /*
         * Reserve some space in the Catalog file.
         */
        bzero(&cookie, sizeof(cookie));
        if ((error = cat_preflight(hfsmp, CAT_EXCHANGE, &cookie, vfs_context_proc(ap->a_context)))) {
                goto exit;
        }
        got_cookie = 1;

        /* The backend code always tries to delete the virtual
         * extent id for exchanging files so we neeed to lock
         * the extents b-tree.
         */
        lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG | SFL_EXTENTS | SFL_ATTRIBUTE, HFS_EXCLUSIVE_LOCK);

        /* Do the exchange */
        error = ExchangeFileIDs(hfsmp,
                                from_cp->c_desc.cd_nameptr,
                                to_cp->c_desc.cd_nameptr,
                                from_cp->c_parentcnid,
                                to_cp->c_parentcnid,
                                from_cp->c_hint,
                                to_cp->c_hint);
        hfs_systemfile_unlock(hfsmp, lockflags);

        /*
         * Note that we don't need to exchange any extended attributes
         * since the attributes are keyed by file ID.
         */

        if (error != E_NONE) {
                error = MacToVFSError(error);
                goto exit;
        }

        /* Purge the vnodes from the name cache */
        if (from_vp)
                cache_purge(from_vp);
        if (to_vp)
                cache_purge(to_vp);

        /* Save a copy of from attributes before swapping. */
        bcopy(&from_cp->c_desc, &tempdesc, sizeof(struct cat_desc));
        bcopy(&from_cp->c_attr, &tempattr, sizeof(struct cat_attr));

        /*
         * Swap the descriptors and all non-fork related attributes.
         * (except the modify date)
         */
        bcopy(&to_cp->c_desc, &from_cp->c_desc, sizeof(struct cat_desc));

        from_cp->c_hint = 0;
        from_cp->c_fileid = from_cp->c_cnid;
        from_cp->c_itime = to_cp->c_itime;
        from_cp->c_btime = to_cp->c_btime;
        from_cp->c_atime = to_cp->c_atime;
        from_cp->c_ctime = to_cp->c_ctime;
        from_cp->c_gid = to_cp->c_gid;
        from_cp->c_uid = to_cp->c_uid;
        from_cp->c_flags = to_cp->c_flags;
        from_cp->c_mode = to_cp->c_mode;
        from_cp->c_attr.ca_recflags = to_cp->c_attr.ca_recflags;
        bcopy(to_cp->c_finderinfo, from_cp->c_finderinfo, 32);

        bcopy(&tempdesc, &to_cp->c_desc, sizeof(struct cat_desc));
        to_cp->c_hint = 0;
        to_cp->c_fileid = to_cp->c_cnid;
        to_cp->c_itime = tempattr.ca_itime;
        to_cp->c_btime = tempattr.ca_btime;
        to_cp->c_atime = tempattr.ca_atime;
        to_cp->c_ctime = tempattr.ca_ctime;
        to_cp->c_gid = tempattr.ca_gid;
        to_cp->c_uid = tempattr.ca_uid;
        to_cp->c_flags = tempattr.ca_flags;
        to_cp->c_mode = tempattr.ca_mode;
        to_cp->c_attr.ca_recflags = tempattr.ca_recflags;
        bcopy(tempattr.ca_finderinfo, to_cp->c_finderinfo, 32);

        /* Rehash the cnodes using their new file IDs */
        hfs_chash_rehash(from_cp, to_cp);

        /*
         * When a file moves out of "Cleanup At Startup"
         * we can drop its NODUMP status.
         */
        if ((from_cp->c_flags & UF_NODUMP) &&
            (from_cp->c_parentcnid != to_cp->c_parentcnid)) {
                from_cp->c_flags &= ~UF_NODUMP;
                from_cp->c_touch_chgtime = TRUE;
        }
        if ((to_cp->c_flags & UF_NODUMP) &&
            (to_cp->c_parentcnid != from_cp->c_parentcnid)) {
                to_cp->c_flags &= ~UF_NODUMP;
                to_cp->c_touch_chgtime = TRUE;
        }

        HFS_KNOTE(from_vp, NOTE_ATTRIB);
        HFS_KNOTE(to_vp, NOTE_ATTRIB);

exit:
        if (got_cookie) {
                cat_postflight(hfsmp, &cookie, vfs_context_proc(ap->a_context));
        }
        if (started_tr) {
            hfs_end_transaction(hfsmp);
        }

        hfs_unlockpair(from_cp, to_cp);
        return (error);
}


/*
 *  cnode must be locked
 */
__private_extern__
int
hfs_fsync(struct vnode *vp, int waitfor, int fullsync, struct proc *p)
{
        struct cnode *cp = VTOC(vp);
        struct filefork *fp = NULL;
        int retval = 0;
        struct hfsmount *hfsmp = VTOHFS(vp);
        struct timeval tv;
        int wait;
        int lockflag;
        int took_trunc_lock = 0;

        wait = (waitfor == MNT_WAIT);

        /* HFS directories don't have any data blocks. */
        if (vnode_isdir(vp))
                goto metasync;

        /*
         * For system files flush the B-tree header and
         * for regular files write out any clusters
         */
        if (vnode_issystem(vp)) {
            if (VTOF(vp)->fcbBTCBPtr != NULL) {
                        // XXXdbg
                        if (hfsmp->jnl == NULL) {
                                BTFlushPath(VTOF(vp));
                        }
            }
        } else if (UBCINFOEXISTS(vp)) {
                hfs_unlock(cp);
                hfs_lock_truncate(cp, TRUE);
                took_trunc_lock = 1;

                /* Don't hold cnode lock when calling into cluster layer. */
                (void) cluster_push(vp, 0);

                hfs_lock(cp, HFS_FORCE_LOCK);
        }
        /*
         * When MNT_WAIT is requested and the zero fill timeout
         * has expired then we must explicitly zero out any areas
         * that are currently marked invalid (holes).
         *
         * Files with NODUMP can bypass zero filling here.
         */
        if ((wait || (cp->c_flag & C_ZFWANTSYNC)) &&
            ((cp->c_flags & UF_NODUMP) == 0) &&
            UBCINFOEXISTS(vp) && (fp = VTOF(vp)) &&
            cp->c_zftimeout != 0) {
                microuptime(&tv);
                if (tv.tv_sec < cp->c_zftimeout) {
                        /* Remember that a force sync was requested. */
                        cp->c_flag |= C_ZFWANTSYNC;
                        goto datasync;
                }
                if (!took_trunc_lock) {
                        hfs_unlock(cp);
                        hfs_lock_truncate(cp, TRUE);
                        hfs_lock(cp, HFS_FORCE_LOCK);
                        took_trunc_lock = 1;
                }

                while (!CIRCLEQ_EMPTY(&fp->ff_invalidranges)) {
                        struct rl_entry *invalid_range = CIRCLEQ_FIRST(&fp->ff_invalidranges);
                        off_t start = invalid_range->rl_start;
                        off_t end = invalid_range->rl_end;
                
                        /* The range about to be written must be validated
                         * first, so that VNOP_BLOCKMAP() will return the
                         * appropriate mapping for the cluster code:
                         */
                        rl_remove(start, end, &fp->ff_invalidranges);

                        /* Don't hold cnode lock when calling into cluster layer. */
                        hfs_unlock(cp);
                        (void) cluster_write(vp, (struct uio *) 0,
                                        fp->ff_size, end + 1, start, (off_t)0,
                                        IO_HEADZEROFILL | IO_NOZERODIRTY | IO_NOCACHE);
                        hfs_lock(cp, HFS_FORCE_LOCK);
                        cp->c_flag |= C_MODIFIED;
                }
                hfs_unlock(cp);
                (void) cluster_push(vp, 0);
                hfs_lock(cp, HFS_FORCE_LOCK);

                cp->c_flag &= ~C_ZFWANTSYNC;
                cp->c_zftimeout = 0;
        }
datasync:
        if (took_trunc_lock)
                hfs_unlock_truncate(cp);
        
        /*
         * if we have a journal and if journal_active() returns != 0 then the
         * we shouldn't do anything to a locked block (because it is part 
         * of a transaction).  otherwise we'll just go through the normal 
         * code path and flush the buffer.  note journal_active() can return
         * -1 if the journal is invalid -- however we still need to skip any 
         * locked blocks as they get cleaned up when we finish the transaction
         * or close the journal.
         */
        // if (hfsmp->jnl && journal_active(hfsmp->jnl) >= 0)
        if (hfsmp->jnl)
                lockflag = BUF_SKIP_LOCKED;
        else
                lockflag = 0;

        /*
         * Flush all dirty buffers associated with a vnode.
         */
        buf_flushdirtyblks(vp, wait, lockflag, "hfs_fsync");

metasync:
        if (vnode_isreg(vp) && vnode_issystem(vp)) {
                if (VTOF(vp)->fcbBTCBPtr != NULL) {
                        microuptime(&tv);
                        BTSetLastSync(VTOF(vp), tv.tv_sec);
                }
                cp->c_touch_acctime = FALSE;
                cp->c_touch_chgtime = FALSE;
                cp->c_touch_modtime = FALSE;
        } else if ( !(vp->v_flag & VSWAP) ) /* User file */ {
                retval = hfs_update(vp, wait);

                /* When MNT_WAIT is requested push out any delayed meta data */
                if ((retval == 0) && wait && cp->c_hint &&
                    !ISSET(cp->c_flag, C_DELETED | C_NOEXISTS)) {
                        hfs_metasync(VTOHFS(vp), (daddr64_t)cp->c_hint, p);
                }

                // make sure that we've really been called from the user
                // fsync() and if so push out any pending transactions 
                // that this file might is a part of (and get them on
                // stable storage).
                if (fullsync || always_do_fullfsync) {
                    if (hfsmp->jnl) {
                        journal_flush(hfsmp->jnl);
                    } else {
                        /* XXX need to pass context! */
                        VNOP_IOCTL(hfsmp->hfs_devvp, DKIOCSYNCHRONIZECACHE, NULL, FWRITE, NULL);
                    }
                }
        }

        return (retval);
}


/* Sync an hfs catalog b-tree node */
static int
hfs_metasync(struct hfsmount *hfsmp, daddr64_t node, struct proc *p)
{
        vnode_t vp;
        buf_t   bp;
        int lockflags;

        vp = HFSTOVCB(hfsmp)->catalogRefNum;

        // XXXdbg - don't need to do this on a journaled volume
        if (hfsmp->jnl) {
                return 0;
        }

        lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_EXCLUSIVE_LOCK);
        /*
         * Look for a matching node that has been delayed
         * but is not part of a set (B_LOCKED).
         *
         * BLK_ONLYVALID causes buf_getblk to return a
         * buf_t for the daddr64_t specified only if it's
         * currently resident in the cache... the size
         * parameter to buf_getblk is ignored when this flag
         * is set
         */
        bp = buf_getblk(vp, node, 0, 0, 0, BLK_META | BLK_ONLYVALID);

        if (bp) {
                if ((buf_flags(bp) & (B_LOCKED | B_DELWRI)) == B_DELWRI)
                        (void) VNOP_BWRITE(bp);
                else
                        buf_brelse(bp);
        }

        hfs_systemfile_unlock(hfsmp, lockflags);

        return (0);
}


/*ARGSUSED 1*/
static int
hfs_btsync_callback(struct buf *bp, void *dummy)
{
        buf_clearflags(bp, B_LOCKED);
        (void) buf_bawrite(bp);

        return(BUF_CLAIMED);
}


__private_extern__
int
hfs_btsync(struct vnode *vp, int sync_transaction)
{
        struct cnode *cp = VTOC(vp);
        struct timeval tv;
        int    flags = 0;

        if (sync_transaction)
                flags |= BUF_SKIP_NONLOCKED;
        /*
         * Flush all dirty buffers associated with b-tree.
         */
        buf_iterate(vp, hfs_btsync_callback, flags, 0);

        microuptime(&tv);
        if (vnode_issystem(vp) && (VTOF(vp)->fcbBTCBPtr != NULL))
                (void) BTSetLastSync(VTOF(vp), tv.tv_sec);
        cp->c_touch_acctime = FALSE;
        cp->c_touch_chgtime = FALSE;
        cp->c_touch_modtime = FALSE;

        return 0;
}

/*
 * Remove a directory.
 */
static int
hfs_vnop_rmdir(ap)
        struct vnop_rmdir_args /* {
                struct vnode *a_dvp;
                struct vnode *a_vp;
                struct componentname *a_cnp;
                vfs_context_t a_context;
        } */ *ap;
{
        struct vnode *dvp = ap->a_dvp;
        struct vnode *vp = ap->a_vp;
        int error;

        if (!vnode_isdir(vp)) {
                return (ENOTDIR);
        }
        if (dvp == vp) {
                return (EINVAL);
        }
        if ((error = hfs_lockpair(VTOC(dvp), VTOC(vp), HFS_EXCLUSIVE_LOCK)))
                return (error);

        error = hfs_removedir(dvp, vp, ap->a_cnp, 0);

        hfs_unlockpair(VTOC(dvp), VTOC(vp));

        return (error);
}

/*
 * Remove a directory
 *
 * Both dvp and vp cnodes are locked
 */
static int
hfs_removedir(struct vnode *dvp, struct vnode *vp, struct componentname *cnp,
              int skip_reserve)
{
        vfs_context_t ctx = cnp->cn_context;
        struct proc *p = vfs_context_proc(ctx);
        struct cnode *cp;
        struct cnode *dcp;
        struct hfsmount * hfsmp;
        struct cat_desc desc;
        cat_cookie_t cookie;
        int lockflags;
        int error = 0, started_tr = 0, got_cookie = 0;

        cp = VTOC(vp);
        dcp = VTOC(dvp);
        hfsmp = VTOHFS(vp);

        if (dcp == cp)
                return (EINVAL);        /* cannot remove "." */

#if QUOTA
        (void)hfs_getinoquota(cp);
#endif
        if ((error = hfs_start_transaction(hfsmp)) != 0) {
            goto out;
        }
        started_tr = 1;

        if (!skip_reserve) {
                /*
                 * Reserve some space in the Catalog file.
                 */
                bzero(&cookie, sizeof(cookie));
                if ((error = cat_preflight(hfsmp, CAT_DELETE, &cookie, p))) {
                        goto out;
                }
                got_cookie = 1;
        }

        /*
         * Verify the directory is empty (and valid).
         * (Rmdir ".." won't be valid since
         *  ".." will contain a reference to
         *  the current directory and thus be
         *  non-empty.)
         */
        if (cp->c_entries != 0) {
                error = ENOTEMPTY;
                goto out;
        }
        if ((dcp->c_flags & APPEND) || (cp->c_flags & (IMMUTABLE | APPEND))) {
                error = EPERM;
                goto out;
        }

        if (cp->c_entries > 0)
                panic("hfs_rmdir: attempting to delete a non-empty directory!");

        /* Remove the entry from the namei cache: */
        cache_purge(vp);

        /* 
         * Protect against a race with rename by using the component
         * name passed in and parent id from dvp (instead of using 
         * the cp->c_desc which may have changed).
         */
        bzero(&desc, sizeof(desc));
        desc.cd_nameptr = cnp->cn_nameptr;
        desc.cd_namelen = cnp->cn_namelen;
        desc.cd_parentcnid = dcp->c_cnid;
        desc.cd_cnid = cp->c_cnid;

        /* Remove entry from catalog */
        lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG | SFL_ATTRIBUTE, HFS_EXCLUSIVE_LOCK);
        error = cat_delete(hfsmp, &desc, &cp->c_attr);
        if (error == 0) {
                /* Delete any attributes, ignore errors */
                (void) hfs_removeallattr(hfsmp, cp->c_fileid);
        }
        hfs_systemfile_unlock(hfsmp, lockflags);

        if (error)
                goto out;

#if QUOTA
        (void)hfs_chkiq(cp, -1, NOCRED, 0);
#endif /* QUOTA */

        /* The parent lost a child */
        if (dcp->c_entries > 0)
                dcp->c_entries--;
        if (dcp->c_nlink > 0)
                dcp->c_nlink--;
        dcp->c_touch_chgtime = TRUE;
        dcp->c_touch_modtime = TRUE;

        dcp->c_flag |= C_FORCEUPDATE;  // XXXdbg - don't screw around, force this guy out
        
        (void) hfs_update(dvp, 0);
        HFS_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);

        hfs_volupdate(hfsmp, VOL_RMDIR, (dcp->c_cnid == kHFSRootFolderID));

        cp->c_mode = 0;  /* Makes the vnode go away...see inactive */
        cp->c_flag |= C_NOEXISTS;
out:
        HFS_KNOTE(vp, NOTE_DELETE);

        if (got_cookie) {
                cat_postflight(hfsmp, &cookie, p);
        }
        if (started_tr) { 
            hfs_end_transaction(hfsmp);
        }

        return (error);
}


/*
 * Remove a file or link.
 */
static int
hfs_vnop_remove(ap)
        struct vnop_remove_args /* {
                struct vnode *a_dvp;
                struct vnode *a_vp;
                struct componentname *a_cnp;
                int a_flags;
                vfs_context_t a_context;
        } */ *ap;
{
        struct vnode *dvp = ap->a_dvp;
        struct vnode *vp = ap->a_vp;
        int error;

        if (dvp == vp) {
                return (EINVAL);
        }

        hfs_lock_truncate(VTOC(vp), TRUE);

        if ((error = hfs_lockpair(VTOC(dvp), VTOC(vp), HFS_EXCLUSIVE_LOCK)))
                goto out;

        error = hfs_removefile(dvp, vp, ap->a_cnp, ap->a_flags, 0);

        hfs_unlockpair(VTOC(dvp), VTOC(vp));
out:
        hfs_unlock_truncate(VTOC(vp));
        return (error);
}


static int
hfs_removefile_callback(struct buf *bp, void *hfsmp) {

        if ( !(buf_flags(bp) & B_META))
                panic("hfs: symlink bp @ 0x%x is not marked meta-data!\n", bp);
        /*
         * it's part of the current transaction, kill it.
         */
        journal_kill_block(((struct hfsmount *)hfsmp)->jnl, bp);

        return (BUF_CLAIMED);
}

/*
 * hfs_removefile
 *
 * Similar to hfs_vnop_remove except there are additional options.
 *
 * Requires cnode and truncate locks to be held.
 */
static int
hfs_removefile(struct vnode *dvp, struct vnode *vp, struct componentname *cnp,
               int flags, int skip_reserve)
{
        struct vnode *rvp = NULL;
        struct cnode *cp;
        struct cnode *dcp;
        struct hfsmount *hfsmp;
        struct cat_desc desc;
        struct timeval tv;
        vfs_context_t ctx = cnp->cn_context;
        int dataforkbusy = 0;
        int rsrcforkbusy = 0;
        int truncated = 0;
        cat_cookie_t cookie;
        int lockflags;
        int error = 0;
        int started_tr = 0, got_cookie = 0;
        int isbigfile = 0;
        cnid_t real_cnid = 0;

        /* Directories should call hfs_rmdir! */
        if (vnode_isdir(vp)) {
                return (EISDIR);
        }

        cp = VTOC(vp);
        dcp = VTOC(dvp);
        hfsmp = VTOHFS(vp);

        if (cp->c_flag & (C_NOEXISTS | C_DELETED)) {
            return 0;
        }
        
        // if it's not a hardlink, check that the parent
        // cnid is the same as the directory cnid
        if (   (cp->c_flag & C_HARDLINK) == 0
            && (cp->c_parentcnid != hfsmp->hfs_privdir_desc.cd_cnid)
            && (cp->c_parentcnid != dcp->c_cnid)) {
                error = EINVAL;
                goto out;
        }

        /* Make sure a remove is permitted */
        if (VNODE_IS_RSRC(vp)) {
                error = EPERM;
                goto out;
        }

        /*
         * Aquire a vnode for a non-empty resource fork.
         * (needed for hfs_truncate)
         */
        if (cp->c_blocks - VTOF(vp)->ff_blocks) {
                error = hfs_vgetrsrc(hfsmp, vp, &rvp, 0);
                if (error)
                        goto out;
        }

        // XXXdbg - don't allow deleting the journal or journal_info_block
        if (hfsmp->jnl && cp->c_datafork) {
                struct HFSPlusExtentDescriptor *extd;

                extd = &cp->c_datafork->ff_extents[0];
                if (extd->startBlock == HFSTOVCB(hfsmp)->vcbJinfoBlock || extd->startBlock == hfsmp->jnl_start) {
                        error = EPERM;
                        goto out;
                }
        }

        /*
         * Check if this file is being used.
         */
        if (vnode_isinuse(vp, 0))
                dataforkbusy = 1;
        if (rvp && vnode_isinuse(rvp, 0))
                rsrcforkbusy = 1;

        // need this to check if we have to break the deletion 
        // into multiple pieces
        isbigfile = (VTOC(vp)->c_datafork->ff_size >= HFS_BIGFILE_SIZE);

        /*
         * Carbon semantics prohibit deleting busy files.
         * (enforced when VNODE_REMOVE_NODELETEBUSY is requested)
         */
        if (dataforkbusy || rsrcforkbusy) {
                if ((flags & VNODE_REMOVE_NODELETEBUSY) ||
                    (hfsmp->hfs_privdir_desc.cd_cnid == 0)) {
                        error = EBUSY;
                        goto out;
                }
        }

#if QUOTA
        (void)hfs_getinoquota(cp);
#endif /* QUOTA */

        /*
         * We do the ubc_setsize before the hfs_truncate
         * since we'll be inside a transaction.
         */
        if ((cp->c_flag & C_HARDLINK) == 0 &&
            (!dataforkbusy || !rsrcforkbusy)) {
                /*
                 * A ubc_setsize can cause a pagein here 
                 * so we need to the drop cnode lock. Note
                 * that we still hold the truncate lock.
                 */
                hfs_unlock(cp);
                if (!dataforkbusy && cp->c_datafork->ff_blocks && !isbigfile) {
                        ubc_setsize(vp, 0);
                }
                if (!rsrcforkbusy && rvp) {
                        ubc_setsize(rvp, 0);
                }
                hfs_lock(cp, HFS_FORCE_LOCK);
        } else {
            struct cat_desc cndesc;

            // for hard links, re-lookup the name that was passed
            // in so we get the correct cnid for the name (as
            // opposed to the c_cnid in the cnode which could have
            // been changed before this node got locked).
            bzero(&cndesc, sizeof(cndesc));
            cndesc.cd_nameptr = cnp->cn_nameptr;
            cndesc.cd_namelen = cnp->cn_namelen;
            cndesc.cd_parentcnid = VTOC(dvp)->c_cnid;
            cndesc.cd_hint = VTOC(dvp)->c_childhint;
            
            lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_SHARED_LOCK);

            if (cat_lookup(hfsmp, &cndesc, 0, NULL, NULL, NULL, &real_cnid) != 0) {
                hfs_systemfile_unlock(hfsmp, lockflags);
                error = ENOENT;
                goto out;
            }
            
            hfs_systemfile_unlock(hfsmp, lockflags);
        }

        if ((error = hfs_start_transaction(hfsmp)) != 0) {
            goto out;
        }
        started_tr = 1;

        if (!skip_reserve) {
                /*
                 * Reserve some space in the Catalog file.
                 */
                if ((error = cat_preflight(hfsmp, CAT_DELETE, &cookie, 0))) {
                        goto out;
                }
                got_cookie = 1;
        }

        /* Remove our entry from the namei cache. */
        cache_purge(vp);

        // XXXdbg - if we're journaled, kill any dirty symlink buffers 
        if (hfsmp->jnl && vnode_islnk(vp))
                buf_iterate(vp, hfs_removefile_callback, BUF_SKIP_NONLOCKED, (void *)hfsmp);

        /*
         * Truncate any non-busy forks.  Busy forks will
         * get trucated when their vnode goes inactive.
         *
         * Since we're already inside a transaction,
         * tell hfs_truncate to skip the ubc_setsize.
         *
         * (Note: hard links are truncated in VOP_INACTIVE)
         */
        if ((cp->c_flag & C_HARDLINK) == 0) {
                int mode = cp->c_mode;

                if (!dataforkbusy && !isbigfile && cp->c_datafork->ff_blocks != 0) {
                        cp->c_mode = 0;  /* Suppress hfs_update */
                        error = hfs_truncate(vp, (off_t)0, IO_NDELAY, 1, ctx);
                        cp->c_mode = mode;
                        if (error)
                                goto out;
                        truncated = 1;
                }
                if (!rsrcforkbusy && rvp) {
                        cp->c_mode = 0;            /* Suppress hfs_update */
                        error = hfs_truncate(rvp, (off_t)0, IO_NDELAY, 1, ctx);
                        cp->c_mode = mode;
                        if (error)
                                goto out;
                        truncated = 1;
                }
        }

        /* 
         * Protect against a race with rename by using the component
         * name passed in and parent id from dvp (instead of using 
         * the cp->c_desc which may have changed).  
         */
        desc.cd_flags = 0;
        desc.cd_encoding = cp->c_desc.cd_encoding;
        desc.cd_nameptr = cnp->cn_nameptr;
        desc.cd_namelen = cnp->cn_namelen;
        desc.cd_parentcnid = dcp->c_cnid;
        desc.cd_hint = cp->c_desc.cd_hint;
        if (real_cnid) {
            // if it was a hardlink we had to re-lookup the cnid
            desc.cd_cnid = real_cnid;
        } else {
            desc.cd_cnid = cp->c_cnid;
        }
        microtime(&tv);

        /*
         * There are 3 remove cases to consider:
         *   1. File is a hardlink    ==> remove the link
         *   2. File is busy (in use) ==> move/rename the file
         *   3. File is not in use    ==> remove the file
         */

        if (cp->c_flag & C_HARDLINK) {
                lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_EXCLUSIVE_LOCK);

                /* Delete the link record */
                error = cat_delete(hfsmp, &desc, &cp->c_attr);
                if (error == 0) {
                        /* Update the parent directory */
                        if (dcp->c_entries > 0)
                                dcp->c_entries--;
                        if (dcp->c_nlink > 0)
                                dcp->c_nlink--;
                        dcp->c_ctime = tv.tv_sec;
                        dcp->c_mtime = tv.tv_sec;
                        (void ) cat_update(hfsmp, &dcp->c_desc, &dcp->c_attr, NULL, NULL);

                        if (--cp->c_nlink < 1) {
                                char inodename[32];
                                char delname[32];
                                struct cat_desc to_desc;
                                struct cat_desc from_desc;

                                /*
                                 * This is now esentially an open deleted file.
                                 * Rename it to reflect this state which makes
                                 * orphan file cleanup easier (see hfs_remove_orphans).
                                 * Note: a rename failure here is not fatal.
                                 */     
                                MAKE_INODE_NAME(inodename, cp->c_rdev);
                                bzero(&from_desc, sizeof(from_desc));
                                from_desc.cd_nameptr = inodename;
                                from_desc.cd_namelen = strlen(inodename);
                                from_desc.cd_parentcnid = hfsmp->hfs_privdir_desc.cd_cnid;
                                from_desc.cd_flags = 0;
                                from_desc.cd_cnid = cp->c_fileid;

                                MAKE_DELETED_NAME(delname, cp->c_fileid);               
                                bzero(&to_desc, sizeof(to_desc));
                                to_desc.cd_nameptr = delname;
                                to_desc.cd_namelen = strlen(delname);
                                to_desc.cd_parentcnid = hfsmp->hfs_privdir_desc.cd_cnid;
                                to_desc.cd_flags = 0;
                                to_desc.cd_cnid = cp->c_fileid;
        
                                error = cat_rename(hfsmp, &from_desc, &hfsmp->hfs_privdir_desc,
                                                   &to_desc, (struct cat_desc *)NULL);
                                if (error != 0) {
                                    panic("hfs_removefile: error %d from cat_rename(%s %s) cp 0x%x\n",
                                          inodename, delname, cp);
                                }
                                if (error == 0) {
                                        /* Update the file's state */
                                        cp->c_flag |= C_DELETED;
                                        cp->c_ctime = tv.tv_sec;        
                                        (void) cat_update(hfsmp, &to_desc, &cp->c_attr, NULL, NULL);
                                }
                        } else {
                                /* Update the file's state */
                                cp->c_ctime = tv.tv_sec;        
                                (void) cat_update(hfsmp, &cp->c_desc, &cp->c_attr, NULL, NULL);
                        }
                }
                hfs_systemfile_unlock(hfsmp, lockflags);
                if (error != 0)
                        goto out;

                hfs_volupdate(hfsmp, VOL_RMFILE, (dcp->c_cnid == kHFSRootFolderID));

        } else if (dataforkbusy || rsrcforkbusy || isbigfile) {
                char delname[32];
                struct cat_desc to_desc;
                struct cat_desc todir_desc;

                /*
                 * Orphan this file (move to hidden directory).
                 */
                bzero(&todir_desc, sizeof(todir_desc));
                todir_desc.cd_parentcnid = 2;

                MAKE_DELETED_NAME(delname, cp->c_fileid);               
                bzero(&to_desc, sizeof(to_desc));
                to_desc.cd_nameptr = delname;
                to_desc.cd_namelen = strlen(delname);
                to_desc.cd_parentcnid = hfsmp->hfs_privdir_desc.cd_cnid;
                to_desc.cd_flags = 0;
                to_desc.cd_cnid = cp->c_cnid;

                lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_EXCLUSIVE_LOCK);

                error = cat_rename(hfsmp, &desc, &todir_desc,
                                &to_desc, (struct cat_desc *)NULL);

                if (error == 0) {
                        hfsmp->hfs_privdir_attr.ca_entries++;
                        (void) cat_update(hfsmp, &hfsmp->hfs_privdir_desc,
                                          &hfsmp->hfs_privdir_attr, NULL, NULL);

                        /* Update the parent directory */
                        if (dcp->c_entries > 0)
                                dcp->c_entries--;
                        if (dcp->c_nlink > 0)
                                dcp->c_nlink--;
                        dcp->c_ctime = tv.tv_sec;
                        dcp->c_mtime = tv.tv_sec;
                        (void) cat_update(hfsmp, &dcp->c_desc, &dcp->c_attr, NULL, NULL);

                        /* Update the file's state */
                        cp->c_flag |= C_DELETED;
                        cp->c_ctime = tv.tv_sec;
                        --cp->c_nlink;
                        (void) cat_update(hfsmp, &to_desc, &cp->c_attr, NULL, NULL);
                }
                hfs_systemfile_unlock(hfsmp, lockflags);
                if (error)
                        goto out;

        } else /* Not busy */ {

                if (cp->c_blocks > 0) {
                        printf("hfs_remove: attempting to delete a non-empty file %s\n",
                                cp->c_desc.cd_nameptr);
                        error = EBUSY;
                        goto out;
                }

                lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG | SFL_ATTRIBUTE, HFS_EXCLUSIVE_LOCK);

                error = cat_delete(hfsmp, &desc, &cp->c_attr);

                if (error && error != ENXIO && error != ENOENT && truncated) {
                        if ((cp->c_datafork && cp->c_datafork->ff_size != 0) ||
                                (cp->c_rsrcfork && cp->c_rsrcfork->ff_size != 0)) {
                                panic("hfs: remove: couldn't delete a truncated file! (%d, data sz %lld; rsrc sz %lld)",
                                          error, cp->c_datafork->ff_size, cp->c_rsrcfork->ff_size);
                        } else {
                                printf("hfs: remove: strangely enough, deleting truncated file %s (%d) got err %d\n",
                                           cp->c_desc.cd_nameptr, cp->c_attr.ca_fileid, error);
                        }
                }
                if (error == 0) {
                        /* Delete any attributes, ignore errors */
                        (void) hfs_removeallattr(hfsmp, cp->c_fileid);

                        /* Update the parent directory */
                        if (dcp->c_entries > 0)
                                dcp->c_entries--;
                        if (dcp->c_nlink > 0)
                                dcp->c_nlink--;
                        dcp->c_ctime = tv.tv_sec;
                        dcp->c_mtime = tv.tv_sec;
                        (void) cat_update(hfsmp, &dcp->c_desc, &dcp->c_attr, NULL, NULL);
                }
                hfs_systemfile_unlock(hfsmp, lockflags);
                if (error)
                        goto out;

#if QUOTA
                (void)hfs_chkiq(cp, -1, NOCRED, 0);
#endif /* QUOTA */

                cp->c_mode = 0;
                truncated  = 0;    // because the catalog entry is gone
                cp->c_flag |= C_NOEXISTS;
                cp->c_touch_chgtime = TRUE;   /* XXX needed ? */
                --cp->c_nlink;

                hfs_volupdate(hfsmp, VOL_RMFILE, (dcp->c_cnid == kHFSRootFolderID));
        }

        /*
         * All done with this cnode's descriptor...
         *
         * Note: all future catalog calls for this cnode must be
         * by fileid only.  This is OK for HFS (which doesn't have
         * file thread records) since HFS doesn't support hard
         * links or the removal of busy files.
         */
        cat_releasedesc(&cp->c_desc);

        HFS_KNOTE(dvp, NOTE_WRITE);

out:
        if (got_cookie) {
                cat_postflight(hfsmp, &cookie, 0);
        }

        /* Commit the truncation to the catalog record */
        if (truncated) {
            cp->c_flag |= C_FORCEUPDATE;
            cp->c_touch_chgtime = TRUE;
            cp->c_touch_modtime = TRUE;
            (void) hfs_update(vp, 0);
        }

        if (started_tr) {
            hfs_end_transaction(hfsmp);
        }

        HFS_KNOTE(vp, NOTE_DELETE);
        if (rvp) {
                HFS_KNOTE(rvp, NOTE_DELETE);
                /* Defer the vnode_put on rvp until the hfs_unlock(). */
                cp->c_flag |= C_NEED_RVNODE_PUT;
        };

        return (error);
}


__private_extern__ void
replace_desc(struct cnode *cp, struct cat_desc *cdp)
{
    if (&cp->c_desc == cdp) {
        return;
    }
         
        /* First release allocated name buffer */
        if (cp->c_desc.cd_flags & CD_HASBUF && cp->c_desc.cd_nameptr != 0) {
                char *name = cp->c_desc.cd_nameptr;

                cp->c_desc.cd_nameptr = 0;
                cp->c_desc.cd_namelen = 0;
                cp->c_desc.cd_flags &= ~CD_HASBUF;
                vfs_removename(name);
        }
        bcopy(cdp, &cp->c_desc, sizeof(cp->c_desc));

        /* Cnode now owns the name buffer */
        cdp->cd_nameptr = 0;
        cdp->cd_namelen = 0;
        cdp->cd_flags &= ~CD_HASBUF;
}


/*
 * Rename a cnode.
 *
 * The VFS layer guarantees that:
 *   - source and destination will either both be directories, or
 *     both not be directories.
 *   - all the vnodes are from the same file system
 *
 * When the target is a directory, HFS must ensure that its empty.
 */
static int
hfs_vnop_rename(ap)
        struct vnop_rename_args  /* {
                struct vnode *a_fdvp;
                struct vnode *a_fvp;
                struct componentname *a_fcnp;
                struct vnode *a_tdvp;
                struct vnode *a_tvp;
                struct componentname *a_tcnp;
                vfs_context_t a_context;
        } */ *ap;
{
        struct vnode *tvp = ap->a_tvp;
        struct vnode *tdvp = ap->a_tdvp;
        struct vnode *fvp = ap->a_fvp;
        struct vnode *fdvp = ap->a_fdvp;
        struct componentname *tcnp = ap->a_tcnp;
        struct componentname *fcnp = ap->a_fcnp;
        struct proc *p = vfs_context_proc(ap->a_context);
        struct cnode *fcp;
        struct cnode *fdcp;
        struct cnode *tdcp;
        struct cnode *tcp;
        struct cat_desc from_desc;
        struct cat_desc to_desc;
        struct cat_desc out_desc;
        struct hfsmount *hfsmp;
        cat_cookie_t cookie;
        int tvp_deleted = 0;
        int started_tr = 0, got_cookie = 0;
        int took_trunc_lock = 0;
        int lockflags;
        int error;

        /* When tvp exist, take the truncate lock for the hfs_removefile(). */
        if (tvp && vnode_isreg(tvp)) {
                hfs_lock_truncate(VTOC(tvp), TRUE);
                took_trunc_lock = 1;
        }

        error = hfs_lockfour(VTOC(fdvp), VTOC(fvp), VTOC(tdvp), tvp ? VTOC(tvp) : NULL,
                             HFS_EXCLUSIVE_LOCK);
        if (error) {
                if (took_trunc_lock)
                        hfs_unlock_truncate(VTOC(tvp)); 
                return (error);
        }

        fdcp = VTOC(fdvp);
        fcp = VTOC(fvp);
        tdcp = VTOC(tdvp);
        tcp = tvp ? VTOC(tvp) : NULL;
        hfsmp = VTOHFS(tdvp);

        /* Check for a race against unlink. */
        if (fcp->c_flag & C_NOEXISTS) {
                error = ENOENT;
                goto out;
        }

        /*
         * The following edge case is caught here:
         * (to cannot be a descendent of from)
         *
         *       o fdvp
         *      /
         *     /
         *    o fvp
         *     \
         *      \
         *       o tdvp
         *      /
         *     /
         *    o tvp
         */
        if (tdcp->c_parentcnid == fcp->c_cnid) {
                error = EINVAL;
                goto out;
        }

        /*
         * The following two edge cases are caught here:
         * (note tvp is not empty)
         *
         *       o tdvp               o tdvp
         *      /                    /
         *     /                    /
         *    o tvp            tvp o fdvp
         *     \                    \
         *      \                    \
         *       o fdvp               o fvp
         *      /
         *     /
         *    o fvp
         */
        if (tvp && vnode_isdir(tvp) && (tcp->c_entries != 0) && fvp != tvp) {
                error = ENOTEMPTY;
                goto out;
        }

        /*
         * The following edge case is caught here:
         * (the from child and parent are the same)
         *
         *          o tdvp
         *         /
         *        /
         *  fdvp o fvp
         */
        if (fdvp == fvp) {
                error = EINVAL;
                goto out;
        }

        /*
         * Make sure "from" vnode and its parent are changeable.
         */
        if ((fcp->c_flags & (IMMUTABLE | APPEND)) || (fdcp->c_flags & APPEND)) {
                error = EPERM;
                goto out;
        }

        /*
         * If the destination parent directory is "sticky", then the
         * user must own the parent directory, or the destination of
         * the rename, otherwise the destination may not be changed
         * (except by root). This implements append-only directories.
         *
         * Note that checks for immutable and write access are done
         * by the call to hfs_removefile.
         */
        if (tvp && (tdcp->c_mode & S_ISTXT) &&
            (suser(vfs_context_ucred(tcnp->cn_context), NULL)) &&
            (kauth_cred_getuid(vfs_context_ucred(tcnp->cn_context)) != tdcp->c_uid) &&
            (hfs_owner_rights(hfsmp, tcp->c_uid, vfs_context_ucred(tcnp->cn_context), p, false)) ) {
                error = EPERM;
                goto out;
        }

#if QUOTA
        if (tvp)
                (void)hfs_getinoquota(tcp);
#endif
        /* Preflighting done, take fvp out of the name space. */
        cache_purge(fvp);

        /*
         * When a file moves out of "Cleanup At Startup"
         * we can drop its NODUMP status.
         */
        if ((fcp->c_flags & UF_NODUMP) &&
            vnode_isreg(fvp) &&
            (fdvp != tdvp) &&
            (fdcp->c_desc.cd_nameptr != NULL) &&
            (strcmp(fdcp->c_desc.cd_nameptr, CARBON_TEMP_DIR_NAME) == 0)) {
                fcp->c_flags &= ~UF_NODUMP;
                fcp->c_touch_chgtime = TRUE;
                (void) hfs_update(fvp, 0);
        }

        bzero(&from_desc, sizeof(from_desc));
        from_desc.cd_nameptr = fcnp->cn_nameptr;
        from_desc.cd_namelen = fcnp->cn_namelen;
        from_desc.cd_parentcnid = fdcp->c_cnid;
        from_desc.cd_flags = fcp->c_desc.cd_flags & ~(CD_HASBUF | CD_DECOMPOSED);
        from_desc.cd_cnid = fcp->c_cnid;

        bzero(&to_desc, sizeof(to_desc));
        to_desc.cd_nameptr = tcnp->cn_nameptr;
        to_desc.cd_namelen = tcnp->cn_namelen;
        to_desc.cd_parentcnid = tdcp->c_cnid;
        to_desc.cd_flags = fcp->c_desc.cd_flags & ~(CD_HASBUF | CD_DECOMPOSED);
        to_desc.cd_cnid = fcp->c_cnid;

        if ((error = hfs_start_transaction(hfsmp)) != 0) {
            goto out;
        }
        started_tr = 1;

        // if it's a hardlink then re-lookup the name so
        // that we get the correct cnid in from_desc (see
        // the comment in hfs_removefile for more details)
        //
        if (fcp->c_flag & C_HARDLINK) {
            struct cat_desc tmpdesc;
            cnid_t real_cnid;

            bzero(&tmpdesc, sizeof(tmpdesc));
            tmpdesc.cd_nameptr = fcnp->cn_nameptr;
            tmpdesc.cd_namelen = fcnp->cn_namelen;
            tmpdesc.cd_parentcnid = fdcp->c_cnid;
            tmpdesc.cd_hint = fdcp->c_childhint;
            
            lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_SHARED_LOCK);

            if (cat_lookup(hfsmp, &tmpdesc, 0, NULL, NULL, NULL, &real_cnid) != 0) {
                hfs_systemfile_unlock(hfsmp, lockflags);
                goto out;
            }

            // use the real cnid instead of whatever happened to be there
            from_desc.cd_cnid = real_cnid;
            hfs_systemfile_unlock(hfsmp, lockflags);
        }

        /*
         * Reserve some space in the Catalog file.
         */
        bzero(&cookie, sizeof(cookie));
        if ((error = cat_preflight(hfsmp, CAT_RENAME + CAT_DELETE, &cookie, p))) {
                goto out;
        }
        got_cookie = 1;

        /*
         * If the destination exists then it may need to be removed.
         */
        if (tvp) {
                /*
                 * When fvp matches tvp they must be case variants
                 * or hard links.
                 */
                if (fvp == tvp) {
                        /*
                         * If this a hard link with different parents
                         * and its not a case variant then tvp should
                         * be removed.
                         */
                        if (!((fcp->c_flag & C_HARDLINK) &&
                            ((fdvp != tdvp) ||
                             (hfs_namecmp(fcnp->cn_nameptr, fcnp->cn_namelen,
                                          tcnp->cn_nameptr, tcnp->cn_namelen) != 0)))) {
                                goto skip;
                        }
                } else {
                        cache_purge(tvp);
                }

                if (vnode_isdir(tvp))
                        error = hfs_removedir(tdvp, tvp, tcnp, HFSRM_SKIP_RESERVE);
                else {
                        error = hfs_removefile(tdvp, tvp, tcnp, 0, HFSRM_SKIP_RESERVE);
                }

                if (error)
                        goto out;
                tvp_deleted = 1;
        }
skip:
        /*
         * All done with tvp and fvp
         */

        lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_EXCLUSIVE_LOCK);
        error = cat_rename(hfsmp, &from_desc, &tdcp->c_desc, &to_desc, &out_desc);
        hfs_systemfile_unlock(hfsmp, lockflags);

        if (error) {
                goto out;
        }

        /* Invalidate negative cache entries in the destination directory */
        if (hfsmp->hfs_flags & HFS_CASE_SENSITIVE)
                cache_purge_negatives(tdvp);

        /* Update cnode's catalog descriptor */
        replace_desc(fcp, &out_desc);
        fcp->c_parentcnid = tdcp->c_cnid;
        fcp->c_hint = 0;

        hfs_volupdate(hfsmp, vnode_isdir(fvp) ? VOL_RMDIR : VOL_RMFILE,
                      (fdcp->c_cnid == kHFSRootFolderID));
        hfs_volupdate(hfsmp, vnode_isdir(fvp) ? VOL_MKDIR : VOL_MKFILE,
                      (tdcp->c_cnid == kHFSRootFolderID));

        /* Update both parent directories. */
        if (fdvp != tdvp) {
                tdcp->c_nlink++;
                tdcp->c_entries++;
                if (fdcp->c_nlink > 0)
                        fdcp->c_nlink--;
                if (fdcp->c_entries > 0)
                        fdcp->c_entries--;
                fdcp->c_touch_chgtime = TRUE;
                fdcp->c_touch_modtime = TRUE;

                fdcp->c_flag |= C_FORCEUPDATE;  // XXXdbg - force it out!
                (void) hfs_update(fdvp, 0);
        }
        tdcp->c_childhint = out_desc.cd_hint;   /* Cache directory's location */
        tdcp->c_touch_chgtime = TRUE;
        tdcp->c_touch_modtime = TRUE;

        tdcp->c_flag |= C_FORCEUPDATE;  // XXXdbg - force it out!
        (void) hfs_update(tdvp, 0);
out:
        if (got_cookie) {
                cat_postflight(hfsmp, &cookie, p);
        }
        if (started_tr) {
            hfs_end_transaction(hfsmp);
        }

        /* Note that if hfs_removedir or hfs_removefile was invoked above they will already have
           generated a NOTE_WRITE for tdvp and a NOTE_DELETE for tvp.
         */
        if (error == 0) {
                HFS_KNOTE(fvp, NOTE_RENAME);
                HFS_KNOTE(fdvp, NOTE_WRITE);
                if (tdvp != fdvp) HFS_KNOTE(tdvp, NOTE_WRITE);
        };

        if (took_trunc_lock)
                hfs_unlock_truncate(VTOC(tvp)); 

        hfs_unlockfour(fdcp, fcp, tdcp, tcp);

        /* After tvp is removed the only acceptable error is EIO */
        if (error && tvp_deleted)
                error = EIO;

        return (error);
}


/*
 * Make a directory.
 */
static int
hfs_vnop_mkdir(struct vnop_mkdir_args *ap)
{
        /***** HACK ALERT ********/
        ap->a_cnp->cn_flags |= MAKEENTRY;
        return hfs_makenode(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap, ap->a_context);
}


/*
 * Create a symbolic link.
 */
static int
hfs_vnop_symlink(struct vnop_symlink_args *ap)
{
        struct vnode **vpp = ap->a_vpp;
        struct vnode *dvp = ap->a_dvp;
        struct vnode *vp = NULL;
        struct hfsmount *hfsmp;
        struct filefork *fp;
        struct buf *bp = NULL;
        char *datap;
        int started_tr = 0;
        int len, error;

        /* HFS standard disks don't support symbolic links */
        if (VTOVCB(dvp)->vcbSigWord != kHFSPlusSigWord)
                return (ENOTSUP);

        /* Check for empty target name */
        if (ap->a_target[0] == 0)
                return (EINVAL);

        /* Create the vnode */
        ap->a_vap->va_mode |= S_IFLNK;
        if ((error = hfs_makenode(dvp, vpp, ap->a_cnp, ap->a_vap, ap->a_context))) {
                goto out;
        }
        vp = *vpp;
        if ((error = hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK)))
                return (error);
        fp = VTOF(vp);
        hfsmp = VTOHFS(dvp);
        len = strlen(ap->a_target);

#if QUOTA
        (void)hfs_getinoquota(VTOC(vp));
#endif /* QUOTA */

        if ((error = hfs_start_transaction(hfsmp)) != 0) {
            goto out;
        }
        started_tr = 1;

        /*
         * Allocate space for the link.
         *
         * Since we're already inside a transaction,
         * tell hfs_truncate to skip the ubc_setsize.
         *
         * Don't need truncate lock since a symlink is treated as a system file.
         */
        error = hfs_truncate(vp, len, IO_NOZEROFILL, 1, ap->a_context);
        if (error)
                goto out;       /* XXX need to remove link */

        /* Write the link to disk */
        bp = buf_getblk(vp, (daddr64_t)0, roundup((int)fp->ff_size, VTOHFS(vp)->hfs_phys_block_size),
                        0, 0, BLK_META);
        if (hfsmp->jnl) {
                journal_modify_block_start(hfsmp->jnl, bp);
        }
        datap = (char *)buf_dataptr(bp);
        bzero(datap, buf_size(bp));
        bcopy(ap->a_target, datap, len);

        if (hfsmp->jnl) {
                journal_modify_block_end(hfsmp->jnl, bp);
        } else {
                buf_bawrite(bp);
        }
        /*
         * We defered the ubc_setsize for hfs_truncate
         * since we were inside a transaction.
         *
         * We don't need to drop the cnode lock here
         * since this is a symlink.
         */
        ubc_setsize(vp, len);
out:
        if (started_tr)
            hfs_end_transaction(hfsmp);
        if (vp) {
                hfs_unlock(VTOC(vp));
        }
        return (error);
}


/* structures to hold a "." or ".." directory entry */
struct hfs_stddotentry {
        u_int32_t       d_fileno;   /* unique file number */
        u_int16_t       d_reclen;   /* length of this structure */
        u_int8_t        d_type;     /* dirent file type */
        u_int8_t        d_namlen;   /* len of filename */
        char            d_name[4];  /* "." or ".." */
};

struct hfs_extdotentry {
        u_int64_t  d_fileno;   /* unique file number */
        u_int64_t  d_seekoff;  /* seek offset (optional, used by servers) */
        u_int16_t  d_reclen;   /* length of this structure */
        u_int16_t  d_namlen;   /* len of filename */
        u_int8_t   d_type;     /* dirent file type */
        u_char     d_name[3];  /* "." or ".." */
};

typedef union {
        struct hfs_stddotentry  std;
        struct hfs_extdotentry  ext;
} hfs_dotentry_t;

/*
 *  hfs_vnop_readdir reads directory entries into the buffer pointed
 *  to by uio, in a filesystem independent format.  Up to uio_resid
 *  bytes of data can be transferred.  The data in the buffer is a
 *  series of packed dirent structures where each one contains the
 *  following entries:
 *
 *      u_int32_t   d_fileno;              // file number of entry
 *      u_int16_t   d_reclen;              // length of this record
 *      u_int8_t    d_type;                // file type
 *      u_int8_t    d_namlen;              // length of string in d_name
 *      char        d_name[MAXNAMELEN+1];  // null terminated file name
 *
 *  The current position (uio_offset) refers to the next block of
 *  entries.  The offset can only be set to a value previously
 *  returned by hfs_vnop_readdir or zero.  This offset does not have
 *  to match the number of bytes returned (in uio_resid).
 *
 *  In fact, the offset used by HFS is essentially an index (26 bits)
 *  with a tag (6 bits).  The tag is for associating the next request
 *  with the current request.  This enables us to have multiple threads
 *  reading the directory while the directory is also being modified.
 *
 *  Each tag/index pair is tied to a unique directory hint.  The hint
 *  contains information (filename) needed to build the catalog b-tree
 *  key for finding the next set of entries.
 */
static int
hfs_vnop_readdir(ap)
        struct vnop_readdir_args /* {
                vnode_t a_vp;
                uio_t a_uio;
                int a_flags;
                int *a_eofflag;
                int *a_numdirent;
                vfs_context_t a_context;
        } */ *ap;
{
        struct vnode *vp = ap->a_vp;
        uio_t uio = ap->a_uio;
        struct cnode *cp;
        struct hfsmount *hfsmp;
        directoryhint_t *dirhint = NULL;
        directoryhint_t localhint;
        off_t offset;
        off_t startoffset;
        int error = 0;
        int eofflag = 0;
        user_addr_t user_start = 0;
        user_size_t user_len = 0;
        int index;
        unsigned int tag;
        int items;
        int lockflags;
        int extended;
        int nfs_cookies;
        caddr_t bufstart;
        cnid_t cnid_hint = 0;

        items = 0;
        startoffset = offset = uio_offset(uio);
        bufstart = CAST_DOWN(caddr_t, uio_iov_base(uio));
        extended = (ap->a_flags & VNODE_READDIR_EXTENDED);
        nfs_cookies = extended && (ap->a_flags & VNODE_READDIR_REQSEEKOFF);

        /* Sanity check the uio data. */
        if ((uio_iovcnt(uio) > 1) ||
            (uio_resid(uio) < (int)sizeof(struct dirent))) {
                return (EINVAL);
        }
        /* Note that the dirhint calls require an exclusive lock. */
        if ((error = hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK)))
                return (error);
        cp = VTOC(vp);
        hfsmp = VTOHFS(vp);

        /* Pick up cnid hint (if any). */
        if (nfs_cookies) {
                cnid_hint = (cnid_t)(uio_offset(uio) >> 32);
                uio_setoffset(uio, uio_offset(uio) & 0x00000000ffffffffLL);
                if (cnid_hint == INT_MAX) { /* searching pass the last item */
                        eofflag = 1;
                        goto out;
                }
        }
        /*
         * Synthesize entries for "." and ".."
         */
        if (offset == 0) {
                hfs_dotentry_t  dotentry[2];
                size_t  uiosize;

                if (extended) {
                        struct hfs_extdotentry *entry = &dotentry[0].ext;

                        entry->d_fileno = cp->c_cnid;
                        entry->d_reclen = sizeof(struct hfs_extdotentry);
                        entry->d_type = DT_DIR;
                        entry->d_namlen = 1;
                        entry->d_name[0] = '.';
                        entry->d_name[1] = '\0';
                        entry->d_name[2] = '\0';
                        entry->d_seekoff = 1;

                        ++entry;
                        entry->d_fileno = cp->c_parentcnid;
                        entry->d_reclen = sizeof(struct hfs_extdotentry);
                        entry->d_type = DT_DIR;
                        entry->d_namlen = 2;
                        entry->d_name[0] = '.';
                        entry->d_name[1] = '.';
                        entry->d_name[2] = '\0';
                        entry->d_seekoff = 2;
                        uiosize = 2 * sizeof(struct hfs_extdotentry);
                } else {
                        struct hfs_stddotentry *entry = &dotentry[0].std;

                        entry->d_fileno = cp->c_cnid;
                        entry->d_reclen = sizeof(struct hfs_stddotentry);
                        entry->d_type = DT_DIR;
                        entry->d_namlen = 1;
                        *(int *)&entry->d_name[0] = 0;
                        entry->d_name[0] = '.';

                        ++entry;
                        entry->d_fileno = cp->c_parentcnid;
                        entry->d_reclen = sizeof(struct hfs_stddotentry);
                        entry->d_type = DT_DIR;
                        entry->d_namlen = 2;
                        *(int *)&entry->d_name[0] = 0;
                        entry->d_name[0] = '.';
                        entry->d_name[1] = '.';
                        uiosize = 2 * sizeof(struct hfs_stddotentry);
                }
                if ((error = uiomove((caddr_t)&dotentry, uiosize, uio))) {
                        goto out;
                }
                offset += 2;
        }

        /* If there are no real entries then we're done. */
        if (cp->c_entries == 0) {
                error = 0;
                eofflag = 1;
                uio_setoffset(uio, offset);
                goto seekoffcalc;
        }

        //
        // We have to lock the user's buffer here so that we won't
        // fault on it after we've acquired a shared lock on the
        // catalog file.  The issue is that you can get a 3-way
        // deadlock if someone else starts a transaction and then
        // tries to lock the catalog file but can't because we're
        // here and we can't service our page fault because VM is
        // blocked trying to start a transaction as a result of
        // trying to free up pages for our page fault.  It's messy
        // but it does happen on dual-procesors that are paging
        // heavily (see radar 3082639 for more info).  By locking
        // the buffer up-front we prevent ourselves from faulting
        // while holding the shared catalog file lock.
        //
        // Fortunately this and hfs_search() are the only two places
        // currently (10/30/02) that can fault on user data with a
        // shared lock on the catalog file.
        //
        if (hfsmp->jnl && uio_isuserspace(uio)) {
                user_start = uio_curriovbase(uio);
                user_len = uio_curriovlen(uio);

                if ((error = vslock(user_start, user_len)) != 0) {
                        user_start = 0;
                        goto out;
                }
        }
        /* Convert offset into a catalog directory index. */
        index = (offset & HFS_INDEX_MASK) - 2;
        tag = offset & ~HFS_INDEX_MASK;

        /* Lock catalog during cat_findname and cat_getdirentries. */
        lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_SHARED_LOCK);

        /* When called from NFS, try and resolve a cnid hint. */
        if (nfs_cookies && cnid_hint != 0) {
                if (cat_findname(hfsmp, cnid_hint, &localhint.dh_desc) == 0) {
                        if ( localhint.dh_desc.cd_parentcnid == cp->c_cnid) {
                                localhint.dh_index = index - 1;
                                localhint.dh_time = 0;
                                bzero(&localhint.dh_link, sizeof(localhint.dh_link));
                                dirhint = &localhint;  /* don't forget to release the descriptor */
                        } else {
                                cat_releasedesc(&localhint.dh_desc);
                        }
                }
        }

        /* Get a directory hint (cnode must be locked exclusive) */
        if (dirhint == NULL) {
                dirhint = hfs_getdirhint(cp, ((index - 1) & HFS_INDEX_MASK) | tag);

                /* Hide tag from catalog layer. */
                dirhint->dh_index &= HFS_INDEX_MASK;
                if (dirhint->dh_index == HFS_INDEX_MASK) {
                        dirhint->dh_index = -1;
                }
        }
        
        /* Pack the buffer with dirent entries. */
        error = cat_getdirentries(hfsmp, cp->c_entries, dirhint, uio, extended, &items, &eofflag);

        hfs_systemfile_unlock(hfsmp, lockflags);

        if (error != 0) {
                goto out;
        }
        
        /* Get index to the next item */
        index += items;
        
        if (items >= (int)cp->c_entries) {
                eofflag = 1;
        }

        /* Convert catalog directory index back into an offset. */
        while (tag == 0)
                tag = (++cp->c_dirhinttag) << HFS_INDEX_BITS;   
        uio_setoffset(uio, (index + 2) | tag);
        dirhint->dh_index |= tag;

seekoffcalc:
        cp->c_touch_acctime = TRUE;

        if (ap->a_numdirent) {
                if (startoffset == 0)
                        items += 2;
                *ap->a_numdirent = items;
        }

out:
        if (hfsmp->jnl && user_start) {
                vsunlock(user_start, user_len, TRUE);
        }
        /* If we didn't do anything then go ahead and dump the hint. */
        if ((dirhint != NULL) &&
            (dirhint != &localhint) &&
            (uio_offset(uio) == startoffset)) {
                hfs_reldirhint(cp, dirhint);
                eofflag = 1;
        }
        if (ap->a_eofflag) {
                *ap->a_eofflag = eofflag;
        }
        if (dirhint == &localhint) {
                cat_releasedesc(&localhint.dh_desc);
        }
        hfs_unlock(cp);
        return (error);
}


/*
 * Read contents of a symbolic link.
 */
static int
hfs_vnop_readlink(ap)
        struct vnop_readlink_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                vfs_context_t a_context;
        } */ *ap;
{
        struct vnode *vp = ap->a_vp;
        struct cnode *cp;
        struct filefork *fp;
        int error;

        if (!vnode_islnk(vp))
                return (EINVAL);
 
        if ((error = hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK)))
                return (error);
        cp = VTOC(vp);
        fp = VTOF(vp);
   
        /* Zero length sym links are not allowed */
        if (fp->ff_size == 0 || fp->ff_size > MAXPATHLEN) {
                VTOVCB(vp)->vcbFlags |= kHFS_DamagedVolume;
                error = EINVAL;
                goto exit;
        }
    
        /* Cache the path so we don't waste buffer cache resources */
        if (fp->ff_symlinkptr == NULL) {
                struct buf *bp = NULL;

                MALLOC(fp->ff_symlinkptr, char *, fp->ff_size, M_TEMP, M_WAITOK);
                error = (int)buf_meta_bread(vp, (daddr64_t)0,
                                            roundup((int)fp->ff_size,
                                            VTOHFS(vp)->hfs_phys_block_size),
                                            vfs_context_ucred(ap->a_context), &bp);
                if (error) {
                        if (bp)
                                buf_brelse(bp);
                        if (fp->ff_symlinkptr) {
                                FREE(fp->ff_symlinkptr, M_TEMP);
                                fp->ff_symlinkptr = NULL;
                        }
                        goto exit;
                }
                bcopy((char *)buf_dataptr(bp), fp->ff_symlinkptr, (size_t)fp->ff_size);

                if (VTOHFS(vp)->jnl && (buf_flags(bp) & B_LOCKED) == 0) {
                        buf_markinvalid(bp);            /* data no longer needed */
                }
                buf_brelse(bp);
        }
        error = uiomove((caddr_t)fp->ff_symlinkptr, (int)fp->ff_size, ap->a_uio);

        /*
         * Keep track blocks read
         */
        if ((VTOHFS(vp)->hfc_stage == HFC_RECORDING) && (error == 0)) {
                
                /*
                 * If this file hasn't been seen since the start of
                 * the current sampling period then start over.
                 */
                if (cp->c_atime < VTOHFS(vp)->hfc_timebase)
                        VTOF(vp)->ff_bytesread = fp->ff_size;
                else
                        VTOF(vp)->ff_bytesread += fp->ff_size;
                
        //      if (VTOF(vp)->ff_bytesread > fp->ff_size)
        //              cp->c_touch_acctime = TRUE;
        }

exit:
        hfs_unlock(cp);
        return (error);
}


/*
 * Get configurable pathname variables.
 */
static int
hfs_vnop_pathconf(ap)
        struct vnop_pathconf_args /* {
                struct vnode *a_vp;
                int a_name;
                int *a_retval;
                vfs_context_t a_context;
        } */ *ap;
{
        switch (ap->a_name) {
        case _PC_LINK_MAX:
                if (VTOHFS(ap->a_vp)->hfs_flags & HFS_STANDARD)
                        *ap->a_retval = 1;
                else
                        *ap->a_retval = HFS_LINK_MAX;
                break;
        case _PC_NAME_MAX:
                if (VTOHFS(ap->a_vp)->hfs_flags & HFS_STANDARD)
                        *ap->a_retval = kHFSMaxFileNameChars;  /* 255 */
                else
                        *ap->a_retval = kHFSPlusMaxFileNameChars;  /* 31 */
                break;
        case _PC_PATH_MAX:
                *ap->a_retval = PATH_MAX;  /* 1024 */
                break;
        case _PC_PIPE_BUF:
                *ap->a_retval = PIPE_BUF;
                break;
        case _PC_CHOWN_RESTRICTED:
                *ap->a_retval = 1;
                break;
        case _PC_NO_TRUNC:
                *ap->a_retval = 0;
                break;
        case _PC_NAME_CHARS_MAX:
                *ap->a_retval = kHFSPlusMaxFileNameChars;
                break;
        case _PC_CASE_SENSITIVE:
                if (VTOHFS(ap->a_vp)->hfs_flags & HFS_CASE_SENSITIVE)
                        *ap->a_retval = 1;
                else
                        *ap->a_retval = 0;
                break;
        case _PC_CASE_PRESERVING:
                *ap->a_retval = 1;
                break;
        default:
                return (EINVAL);
        }

        return (0);
}


/*
 * Update a cnode's on-disk metadata.
 *
 * If waitfor is set, then wait for the disk write of
 * the node to complete.
 *
 * The cnode must be locked exclusive
 */
__private_extern__
int
hfs_update(struct vnode *vp, __unused int waitfor)
{
        struct cnode *cp = VTOC(vp);
        struct proc *p;
        struct cat_fork *dataforkp = NULL;
        struct cat_fork *rsrcforkp = NULL;
        struct cat_fork datafork;
        struct hfsmount *hfsmp;
        int lockflags;
        int error;

        p = current_proc();
        hfsmp = VTOHFS(vp);

        if (vnode_issystem(vp) && (cp->c_cnid < kHFSFirstUserCatalogNodeID)) {
                return (0);
        }
        if ((hfsmp->hfs_flags & HFS_READ_ONLY) || (cp->c_mode == 0)) {
                cp->c_flag &= ~C_MODIFIED;
                cp->c_touch_acctime = 0;
                cp->c_touch_chgtime = 0;
                cp->c_touch_modtime = 0;
                return (0);
        }

        hfs_touchtimes(hfsmp, cp);

        /* Nothing to update. */
        if ((cp->c_flag & (C_MODIFIED | C_FORCEUPDATE)) == 0) {
                return (0);
        }
        
        if (cp->c_datafork)
                dataforkp = &cp->c_datafork->ff_data;
        if (cp->c_rsrcfork)
                rsrcforkp = &cp->c_rsrcfork->ff_data;

        /*
         * For delayed allocations updates are
         * postponed until an fsync or the file
         * gets written to disk.
         *
         * Deleted files can defer meta data updates until inactive.
         *
         * If we're ever called with the C_FORCEUPDATE flag though
         * we have to do the update.
         */
        if (ISSET(cp->c_flag, C_FORCEUPDATE) == 0 &&
            (ISSET(cp->c_flag, C_DELETED) || 
            (dataforkp && cp->c_datafork->ff_unallocblocks) ||
            (rsrcforkp && cp->c_rsrcfork->ff_unallocblocks))) {
        //      cp->c_flag &= ~(C_ACCESS | C_CHANGE | C_UPDATE);
                cp->c_flag |= C_MODIFIED;

                HFS_KNOTE(vp, NOTE_ATTRIB);

                return (0);
        }

        if ((error = hfs_start_transaction(hfsmp)) != 0) {
            return error;
        }

        /*
         * For files with invalid ranges (holes) the on-disk
         * field representing the size of the file (cf_size)
         * must be no larger than the start of the first hole.
         */
        if (dataforkp && !CIRCLEQ_EMPTY(&cp->c_datafork->ff_invalidranges)) {
                bcopy(dataforkp, &datafork, sizeof(datafork));
                datafork.cf_size = CIRCLEQ_FIRST(&cp->c_datafork->ff_invalidranges)->rl_start;
                dataforkp = &datafork;
        } else if (dataforkp && (cp->c_datafork->ff_unallocblocks != 0)) {
                // always make sure the block count and the size 
                // of the file match the number of blocks actually
                // allocated to the file on disk
                bcopy(dataforkp, &datafork, sizeof(datafork));
                // make sure that we don't assign a negative block count
                if (cp->c_datafork->ff_blocks < cp->c_datafork->ff_unallocblocks) {
                    panic("hfs: ff_blocks %d is less than unalloc blocks %d\n",
                          cp->c_datafork->ff_blocks, cp->c_datafork->ff_unallocblocks);
                }
                datafork.cf_blocks = (cp->c_datafork->ff_blocks - cp->c_datafork->ff_unallocblocks);
                datafork.cf_size   = datafork.cf_blocks * HFSTOVCB(hfsmp)->blockSize;
                dataforkp = &datafork;
        }

        /*
         * Lock the Catalog b-tree file.
         * A shared lock is sufficient since an update doesn't change
         * the tree and the lock on vp protects the cnode.
         */
        lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_SHARED_LOCK);

        /* XXX - waitfor is not enforced */
        error = cat_update(hfsmp, &cp->c_desc, &cp->c_attr, dataforkp, rsrcforkp);

        hfs_systemfile_unlock(hfsmp, lockflags);

        /* After the updates are finished, clear the flags */
        cp->c_flag &= ~(C_MODIFIED | C_FORCEUPDATE);

        hfs_end_transaction(hfsmp);

        HFS_KNOTE(vp, NOTE_ATTRIB);
        
        return (error);
}

/*
 * Allocate a new node
 */
static int
hfs_makenode(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
             struct vnode_attr *vap, vfs_context_t ctx)
{
        struct cnode *cp = NULL;
        struct cnode *dcp;
        struct vnode *tvp;
        struct hfsmount *hfsmp;
        struct cat_desc in_desc, out_desc;
        struct cat_attr attr;
        struct timeval tv;
        cat_cookie_t cookie;
        int lockflags;
        int error, started_tr = 0, got_cookie = 0;
        enum vtype vnodetype;
        int mode;

        if ((error = hfs_lock(VTOC(dvp), HFS_EXCLUSIVE_LOCK)))
                return (error);
        dcp = VTOC(dvp);
        hfsmp = VTOHFS(dvp);
        *vpp = NULL;
        tvp = NULL;
        out_desc.cd_flags = 0;
        out_desc.cd_nameptr = NULL;

        mode = MAKEIMODE(vap->va_type, vap->va_mode);

        if ((mode & S_IFMT) == 0)
                mode |= S_IFREG;
        vnodetype = IFTOVT(mode);

        /* Check if were out of usable disk space. */
        if ((hfs_freeblks(hfsmp, 1) <= 0) && (suser(vfs_context_ucred(ctx), NULL) != 0)) {
                error = ENOSPC;
                goto exit;
        }

        microtime(&tv);

        /* Setup the default attributes */
        bzero(&attr, sizeof(attr));
        attr.ca_mode = mode;
        attr.ca_nlink = vnodetype == VDIR ? 2 : 1;
        attr.ca_mtime = tv.tv_sec;
        if ((VTOVCB(dvp)->vcbSigWord == kHFSSigWord) && gTimeZone.tz_dsttime) {
                attr.ca_mtime += 3600;  /* Same as what hfs_update does */
        }
        attr.ca_atime = attr.ca_ctime = attr.ca_itime = attr.ca_mtime;
        attr.ca_atimeondisk = attr.ca_atime;
        /* On HFS+ the ThreadExists flag must always be set for files. */
        if (vnodetype != VDIR && (hfsmp->hfs_flags & HFS_STANDARD) == 0)
                attr.ca_recflags = kHFSThreadExistsMask;

        attr.ca_uid = vap->va_uid;
        attr.ca_gid = vap->va_gid;
        VATTR_SET_SUPPORTED(vap, va_mode);
        VATTR_SET_SUPPORTED(vap, va_uid);
        VATTR_SET_SUPPORTED(vap, va_gid);

        /* Tag symlinks with a type and creator. */
        if (vnodetype == VLNK) {
                struct FndrFileInfo *fip;

                fip = (struct FndrFileInfo *)&attr.ca_finderinfo;
                fip->fdType    = SWAP_BE32(kSymLinkFileType);
                fip->fdCreator = SWAP_BE32(kSymLinkCreator);
        }
        if (cnp->cn_flags & ISWHITEOUT)
                attr.ca_flags |= UF_OPAQUE;

        /* Setup the descriptor */
        in_desc.cd_nameptr = cnp->cn_nameptr;
        in_desc.cd_namelen = cnp->cn_namelen;
        in_desc.cd_parentcnid = dcp->c_cnid;
        in_desc.cd_flags = S_ISDIR(mode) ? CD_ISDIR : 0;
        in_desc.cd_hint = dcp->c_childhint;
        in_desc.cd_encoding = 0;

        if ((error = hfs_start_transaction(hfsmp)) != 0) {
            goto exit;
        }
        started_tr = 1;

        /*
         * Reserve some space in the Catalog file.
         *
         * (we also add CAT_DELETE since our getnewvnode
         *  request can cause an hfs_inactive call to
         *  delete an unlinked file)
         */
        if ((error = cat_preflight(hfsmp, CAT_CREATE | CAT_DELETE, &cookie, 0))) {
                goto exit;
        }
        got_cookie = 1;

        lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_EXCLUSIVE_LOCK);
        error = cat_create(hfsmp, &in_desc, &attr, &out_desc);
        if (error == 0) {
                /* Update the parent directory */
                dcp->c_childhint = out_desc.cd_hint;    /* Cache directory's location */
                dcp->c_nlink++;
                dcp->c_entries++;
                dcp->c_ctime = tv.tv_sec;
                dcp->c_mtime = tv.tv_sec;
                (void) cat_update(hfsmp, &dcp->c_desc, &dcp->c_attr, NULL, NULL);
                HFS_KNOTE(dvp, NOTE_ATTRIB);
        }
        hfs_systemfile_unlock(hfsmp, lockflags);
        if (error)
                goto exit;
        
        /* Invalidate negative cache entries in the directory */
        if (hfsmp->hfs_flags & HFS_CASE_SENSITIVE)
                cache_purge_negatives(dvp);

        if (vnodetype == VDIR) {
                HFS_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
        } else {
                HFS_KNOTE(dvp, NOTE_WRITE);
        };

        hfs_volupdate(hfsmp, vnodetype == VDIR ? VOL_MKDIR : VOL_MKFILE,
                (dcp->c_cnid == kHFSRootFolderID));

        // XXXdbg
        // have to end the transaction here before we call hfs_getnewvnode()
        // because that can cause us to try and reclaim a vnode on a different
        // file system which could cause us to start a transaction which can
        // deadlock with someone on that other file system (since we could be
        // holding two transaction locks as well as various vnodes and we did
        // not obtain the locks on them in the proper order).
        //
        // NOTE: this means that if the quota check fails or we have to update
        //       the change time on a block-special device that those changes
        //       will happen as part of independent transactions.
        //
        if (started_tr) {
            hfs_end_transaction(hfsmp);
            started_tr = 0;
        }

        /*
         * Create a vnode for the object just created.
         *
         * The cnode is locked on successful return.
         */
        error = hfs_getnewvnode(hfsmp, dvp, cnp, &out_desc, 0, &attr, NULL, &tvp);
        if (error)
                goto exit;

        // XXXdbg
        //cache_enter(dvp, tvp, cnp);

        cp = VTOC(tvp);
#if QUOTA
        /* 
         * We call hfs_chkiq with FORCE flag so that if we
         * fall through to the rmdir we actually have 
         * accounted for the inode
        */
        if (vfs_flags(HFSTOVFS(hfsmp)) & MNT_QUOTA) {
                if ((error = hfs_getinoquota(cp)) ||
                    (error = hfs_chkiq(cp, 1, vfs_context_ucred(ctx), FORCE))) {
        
                        if (vnode_isdir(tvp))
                                (void) hfs_removedir(dvp, tvp, cnp, 0);
                        else {
                                hfs_unlock(cp);
                                hfs_lock_truncate(cp, TRUE);
                                hfs_lock(cp, HFS_FORCE_LOCK);
                                (void) hfs_removefile(dvp, tvp, cnp, 0, 0);
                                hfs_unlock_truncate(cp);
                        }
                        /*
                         * we successfully allocated a new vnode, but
                         * the quota check is telling us we're beyond
                         * our limit, so we need to dump our lock + reference
                         */
                        hfs_unlock(cp);
                        vnode_put(tvp);
        
                        goto exit;
                }
        }
#endif /* QUOTA */

        /* Remember if any ACL data was set. */
        if (VATTR_IS_ACTIVE(vap, va_acl) &&
            (vap->va_acl != NULL)) {
                cp->c_attr.ca_recflags |= kHFSHasSecurityMask;
                cp->c_touch_chgtime = TRUE;
                (void) hfs_update(tvp, TRUE);
        }
        *vpp = tvp;
exit:
        cat_releasedesc(&out_desc);

        if (got_cookie) {
                cat_postflight(hfsmp, &cookie, 0);
        }
        /*
         * Check if a file is located in the "Cleanup At Startup"
         * directory.  If it is then tag it as NODUMP so that we
         * can be lazy about zero filling data holes.
         */
        if ((error == 0) && dvp && (vnodetype == VREG) &&
            (dcp->c_desc.cd_nameptr != NULL) &&
            (strcmp(dcp->c_desc.cd_nameptr, CARBON_TEMP_DIR_NAME) == 0)) {
                struct vnode *ddvp;

                hfs_unlock(dcp);
                dvp = NULL;

                /*
                 * The parent of "Cleanup At Startup" should
                 * have the ASCII name of the userid.
                 */
                if (hfs_vget(hfsmp, dcp->c_parentcnid, &ddvp, 0) == 0) {
                        if (VTOC(ddvp)->c_desc.cd_nameptr) {
                                uid_t uid;

                                uid = strtoul(VTOC(ddvp)->c_desc.cd_nameptr, 0, 0);
                                if ((uid == cp->c_uid) ||
                                    (uid == vfs_context_ucred(ctx)->cr_uid)) {
                                        cp->c_flags |= UF_NODUMP;
                                        cp->c_touch_chgtime = TRUE;
                                }
                        }
                        hfs_unlock(VTOC(ddvp));
                        vnode_put(ddvp);
                }
        }
        if (dvp) {
                hfs_unlock(dcp);
        }
        if (error == 0 && cp != NULL) {
                hfs_unlock(cp);
        }
        if (started_tr) {
            hfs_end_transaction(hfsmp);
            started_tr = 0;
        }

        return (error);
}


/*
 * WARNING - assumes caller has cnode lock.
 */
__private_extern__
int
hfs_vgetrsrc(struct hfsmount *hfsmp, struct vnode *vp, struct vnode **rvpp, __unused struct proc *p)
{
        struct vnode *rvp;
        struct cnode *cp = VTOC(vp);
        int error;
        int vid;

        if ((rvp = cp->c_rsrc_vp)) {
                vid = vnode_vid(rvp);

                /* Use exising vnode */
                error = vnode_getwithvid(rvp, vid);
                if (error) {
                        char * name = VTOC(vp)->c_desc.cd_nameptr;

                        if (name)
                                printf("hfs_vgetrsrc: couldn't get"
                                        " resource fork for %s\n", name);
                        return (error);
                }
        } else {
                struct cat_fork rsrcfork;
                struct componentname cn;
                int lockflags;

                /*
                 * Make sure cnode lock is exclusive, if not upgrade it.
                 *
                 * We assume that we were called from a read-only VNOP (getattr)
                 * and that its safe to have the cnode lock dropped and reacquired.
                 */
                if (cp->c_lockowner != current_thread()) {
                        /*
                         * If the upgrade fails we loose the lock and
                         * have to take the exclusive lock on our own.
                         */
                        if (lck_rw_lock_shared_to_exclusive(&cp->c_rwlock) != 0)
                                lck_rw_lock_exclusive(&cp->c_rwlock);
                        cp->c_lockowner = current_thread();
                }

                lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_SHARED_LOCK);

                /* Get resource fork data */
                error = cat_lookup(hfsmp, &cp->c_desc, 1, (struct cat_desc *)0,
                                (struct cat_attr *)0, &rsrcfork, NULL);

                hfs_systemfile_unlock(hfsmp, lockflags);
                if (error)
                        return (error);
                
                /*
                 * Supply hfs_getnewvnode with a component name. 
                 */
                cn.cn_pnbuf = NULL;
                if (cp->c_desc.cd_nameptr) {
                        MALLOC_ZONE(cn.cn_pnbuf, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK);
                        cn.cn_nameiop = LOOKUP;
                        cn.cn_flags = ISLASTCN | HASBUF;
                        cn.cn_context = NULL;
                        cn.cn_pnlen = MAXPATHLEN;
                        cn.cn_nameptr = cn.cn_pnbuf;
                        cn.cn_hash = 0;
                        cn.cn_consume = 0;
                        cn.cn_namelen = sprintf(cn.cn_nameptr, "%s%s", cp->c_desc.cd_nameptr, _PATH_RSRCFORKSPEC);
                }
                error = hfs_getnewvnode(hfsmp, vnode_parent(vp), cn.cn_pnbuf ? &cn : NULL,
                                        &cp->c_desc, 2, &cp->c_attr, &rsrcfork, &rvp);
                if (cn.cn_pnbuf)
                        FREE_ZONE(cn.cn_pnbuf, cn.cn_pnlen, M_NAMEI);
                if (error)
                        return (error);
        }

        *rvpp = rvp;
        return (0);
}


static void
filt_hfsdetach(struct knote *kn)
{
        struct vnode *vp;
        
        vp = (struct vnode *)kn->kn_hook;
        if (vnode_getwithvid(vp, kn->kn_hookid))
                return;

        if (1) {  /* ! KNDETACH_VNLOCKED */
                if (hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK) == 0) {
                        (void) KNOTE_DETACH(&VTOC(vp)->c_knotes, kn);
                        hfs_unlock(VTOC(vp));
                }
        }

        vnode_put(vp);
}

/*ARGSUSED*/
static int
filt_hfsread(struct knote *kn, long hint)
{
        struct vnode *vp = (struct vnode *)kn->kn_hook;
        int dropvp = 0;

        if (hint == 0)  {
                if ((vnode_getwithvid(vp, kn->kn_hookid) != 0)) {
                        hint = NOTE_REVOKE;
                } else 
                        dropvp = 1;
        }
        if (hint == NOTE_REVOKE) {
                /*
                 * filesystem is gone, so set the EOF flag and schedule 
                 * the knote for deletion.
                 */
                kn->kn_flags |= (EV_EOF | EV_ONESHOT);
                return (1);
        }

        /* poll(2) semantics dictate always saying there is data */
        kn->kn_data = (!(kn->kn_flags & EV_POLL)) ?
                VTOF(vp)->ff_size - kn->kn_fp->f_fglob->fg_offset : 1;

        if  (dropvp)
                vnode_put(vp);

        return (kn->kn_data != 0);
}

/*ARGSUSED*/
static int
filt_hfswrite(struct knote *kn, long hint)
{
        int dropvp = 0;
        
        if (hint == 0)  {
                if ((vnode_getwithvid(kn->kn_hook, kn->kn_hookid) != 0)) {
                        hint = NOTE_REVOKE;
                } else 
                        vnode_put(kn->kn_hook);
        }
        if (hint == NOTE_REVOKE) {
                /*
                 * filesystem is gone, so set the EOF flag and schedule 
                 * the knote for deletion.
                 */
                kn->kn_data = 0;
                kn->kn_flags |= (EV_EOF | EV_ONESHOT);
                return (1);
        }
        kn->kn_data = 0;
        return (1);
}

static int
filt_hfsvnode(struct knote *kn, long hint)
{

        if (hint == 0)  {
                if ((vnode_getwithvid(kn->kn_hook, kn->kn_hookid) != 0)) {
                        hint = NOTE_REVOKE;
                } else
                        vnode_put(kn->kn_hook);
        }
        if (kn->kn_sfflags & hint)
                kn->kn_fflags |= hint;
        if ((hint == NOTE_REVOKE)) {
                kn->kn_flags |= (EV_EOF | EV_ONESHOT);
                return (1);
        }
        
        return (kn->kn_fflags != 0);
}

static struct filterops hfsread_filtops = 
        { 1, NULL, filt_hfsdetach, filt_hfsread };
static struct filterops hfswrite_filtops = 
        { 1, NULL, filt_hfsdetach, filt_hfswrite };
static struct filterops hfsvnode_filtops = 
        { 1, NULL, filt_hfsdetach, filt_hfsvnode };

/*
 * Add a kqueue filter.
 */
static int
hfs_vnop_kqfiltadd(
        struct vnop_kqfilt_add_args /* {
                struct vnode *a_vp;
                struct knote *a_kn;
                struct proc *p;
                vfs_context_t a_context;
        } */ *ap)
{
        struct vnode *vp = ap->a_vp;
        struct knote *kn = ap->a_kn;
        int error;

        switch (kn->kn_filter) {
        case EVFILT_READ:
                if (vnode_isreg(vp)) {
                        kn->kn_fop = &hfsread_filtops;
                } else {
                        return EINVAL;
                };
                break;
        case EVFILT_WRITE:
                if (vnode_isreg(vp)) {
                        kn->kn_fop = &hfswrite_filtops;
                } else {
                        return EINVAL;
                };
                break;
        case EVFILT_VNODE:
                kn->kn_fop = &hfsvnode_filtops;
                break;
        default:
                return (1);
        }

        kn->kn_hook = (caddr_t)vp;
        kn->kn_hookid = vnode_vid(vp);

        if ((error = hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK)))
                return (error);
        KNOTE_ATTACH(&VTOC(vp)->c_knotes, kn);
        hfs_unlock(VTOC(vp));

        return (0);
}

/*
 * Remove a kqueue filter
 */
static int
hfs_vnop_kqfiltremove(ap)
        struct vnop_kqfilt_remove_args /* {
                struct vnode *a_vp;
                uintptr_t ident;
                vfs_context_t a_context;
        } */ *ap;
{
        int result;

        result = ENOTSUP; /* XXX */
        
        return (result);
}

/*
 * Wrapper for special device reads
 */
static int
hfsspec_read(ap)
        struct vnop_read_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                int  a_ioflag;
                vfs_context_t a_context;
        } */ *ap;
{
        /*
         * Set access flag.
         */
        VTOC(ap->a_vp)->c_touch_acctime = TRUE;
        return (VOCALL (spec_vnodeop_p, VOFFSET(vnop_read), ap));
}

/*
 * Wrapper for special device writes
 */
static int
hfsspec_write(ap)
        struct vnop_write_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                int  a_ioflag;
                vfs_context_t a_context;
        } */ *ap;
{
        /*
         * Set update and change flags.
         */
        VTOC(ap->a_vp)->c_touch_chgtime = TRUE;
        VTOC(ap->a_vp)->c_touch_modtime = TRUE;
        return (VOCALL (spec_vnodeop_p, VOFFSET(vnop_write), ap));
}

/*
 * Wrapper for special device close
 *
 * Update the times on the cnode then do device close.
 */
static int
hfsspec_close(ap)
        struct vnop_close_args /* {
                struct vnode *a_vp;
                int  a_fflag;
                vfs_context_t a_context;
        } */ *ap;
{
        struct vnode *vp = ap->a_vp;
        struct cnode *cp;

        if (vnode_isinuse(ap->a_vp, 1)) {
                if (hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK) == 0) {
                        cp = VTOC(vp);
                        hfs_touchtimes(VTOHFS(vp), cp);
                        hfs_unlock(cp);
                }
        }
        return (VOCALL (spec_vnodeop_p, VOFFSET(vnop_close), ap));
}

#if FIFO
/*
 * Wrapper for fifo reads
 */
static int
hfsfifo_read(ap)
        struct vnop_read_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                int  a_ioflag;
                vfs_context_t a_context;
        } */ *ap;
{
        extern int (**fifo_vnodeop_p)(void *);

        /*
         * Set access flag.
         */
        VTOC(ap->a_vp)->c_touch_acctime = TRUE;
        return (VOCALL (fifo_vnodeop_p, VOFFSET(vnop_read), ap));
}

/*
 * Wrapper for fifo writes
 */
static int
hfsfifo_write(ap)
        struct vnop_write_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                int  a_ioflag;
                vfs_context_t a_context;
        } */ *ap;
{
        extern int (**fifo_vnodeop_p)(void *);

        /*
         * Set update and change flags.
         */
        VTOC(ap->a_vp)->c_touch_chgtime = TRUE;
        VTOC(ap->a_vp)->c_touch_modtime = TRUE;
        return (VOCALL (fifo_vnodeop_p, VOFFSET(vnop_write), ap));
}

/*
 * Wrapper for fifo close
 *
 * Update the times on the cnode then do device close.
 */
static int
hfsfifo_close(ap)
        struct vnop_close_args /* {
                struct vnode *a_vp;
                int  a_fflag;
                vfs_context_t a_context;
        } */ *ap;
{
        extern int (**fifo_vnodeop_p)(void *);
        struct vnode *vp = ap->a_vp;
        struct cnode *cp;

        if (vnode_isinuse(ap->a_vp, 1)) {
                if (hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK) == 0) {
                        cp = VTOC(vp);
                        hfs_touchtimes(VTOHFS(vp), cp);
                        hfs_unlock(cp);
                }
        }
        return (VOCALL (fifo_vnodeop_p, VOFFSET(vnop_close), ap));
}

/*
 * kqfilt_add wrapper for fifos.
 *
 * Fall through to hfs kqfilt_add routines if needed 
 */
int
hfsfifo_kqfilt_add(ap)
        struct vnop_kqfilt_add_args *ap;
{
        extern int (**fifo_vnodeop_p)(void *);
        int error;

        error = VOCALL(fifo_vnodeop_p, VOFFSET(vnop_kqfilt_add), ap);
        if (error)
                error = hfs_vnop_kqfiltadd(ap);
        return (error);
}

/*
 * kqfilt_remove wrapper for fifos.
 *
 * Fall through to hfs kqfilt_remove routines if needed 
 */
int
hfsfifo_kqfilt_remove(ap)
        struct vnop_kqfilt_remove_args *ap;
{
        extern int (**fifo_vnodeop_p)(void *);
        int error;

        error = VOCALL(fifo_vnodeop_p, VOFFSET(vnop_kqfilt_remove), ap);
        if (error)
                error = hfs_vnop_kqfiltremove(ap);
        return (error);
}

#endif /* FIFO */

/*
 * Synchronize a file's in-core state with that on disk.
 */
static int
hfs_vnop_fsync(ap)
        struct vnop_fsync_args /* {
                struct vnode *a_vp;
                int a_waitfor;
                vfs_context_t a_context;
        } */ *ap;
{
        struct vnode* vp = ap->a_vp;
        int error;

        /*
         * We need to allow ENOENT lock errors since unlink
         * systenm call can call VNOP_FSYNC during vclean.
         */
        error = hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK);
        if (error)
                return (0);

        error = hfs_fsync(vp, ap->a_waitfor, 0, vfs_context_proc(ap->a_context));

        hfs_unlock(VTOC(vp));
        return (error);
}

/*****************************************************************************
*
*       VOP Tables
*
*****************************************************************************/
int hfs_vnop_readdirattr(struct vnop_readdirattr_args *);  /* in hfs_attrlist.c */
int hfs_vnop_inactive(struct vnop_inactive_args *);        /* in hfs_cnode.c */
int hfs_vnop_reclaim(struct vnop_reclaim_args *);          /* in hfs_cnode.c */
int hfs_vnop_link(struct vnop_link_args *);                /* in hfs_link.c */
int hfs_vnop_lookup(struct vnop_lookup_args *);            /* in hfs_lookup.c */
int hfs_vnop_search(struct vnop_searchfs_args *);          /* in hfs_search.c */

int hfs_vnop_read(struct vnop_read_args *);           /* in hfs_readwrite.c */
int hfs_vnop_write(struct vnop_write_args *);         /* in hfs_readwrite.c */
int hfs_vnop_ioctl(struct vnop_ioctl_args *);         /* in hfs_readwrite.c */
int hfs_vnop_select(struct vnop_select_args *);       /* in hfs_readwrite.c */
int hfs_vnop_strategy(struct vnop_strategy_args *);   /* in hfs_readwrite.c */
int hfs_vnop_allocate(struct vnop_allocate_args *);   /* in hfs_readwrite.c */
int hfs_vnop_pagein(struct vnop_pagein_args *);       /* in hfs_readwrite.c */
int hfs_vnop_pageout(struct vnop_pageout_args *);     /* in hfs_readwrite.c */
int hfs_vnop_bwrite(struct vnop_bwrite_args *);       /* in hfs_readwrite.c */
int hfs_vnop_blktooff(struct vnop_blktooff_args *);   /* in hfs_readwrite.c */
int hfs_vnop_offtoblk(struct vnop_offtoblk_args *);   /* in hfs_readwrite.c */
int hfs_vnop_blockmap(struct vnop_blockmap_args *);   /* in hfs_readwrite.c */
int hfs_vnop_getxattr(struct vnop_getxattr_args *);        /* in hfs_xattr.c */
int hfs_vnop_setxattr(struct vnop_setxattr_args *);        /* in hfs_xattr.c */
int hfs_vnop_removexattr(struct vnop_removexattr_args *);  /* in hfs_xattr.c */
int hfs_vnop_listxattr(struct vnop_listxattr_args *);      /* in hfs_xattr.c */

int (**hfs_vnodeop_p)(void *);

#define VOPFUNC int (*)(void *)

struct vnodeopv_entry_desc hfs_vnodeop_entries[] = {
    { &vnop_default_desc, (VOPFUNC)vn_default_error },
    { &vnop_lookup_desc, (VOPFUNC)hfs_vnop_lookup },            /* lookup */
    { &vnop_create_desc, (VOPFUNC)hfs_vnop_create },            /* create */
    { &vnop_mknod_desc, (VOPFUNC)hfs_vnop_mknod },             /* mknod */
    { &vnop_open_desc, (VOPFUNC)hfs_vnop_open },                        /* open */
    { &vnop_close_desc, (VOPFUNC)hfs_vnop_close },              /* close */
    { &vnop_getattr_desc, (VOPFUNC)hfs_vnop_getattr },          /* getattr */
    { &vnop_setattr_desc, (VOPFUNC)hfs_vnop_setattr },          /* setattr */
    { &vnop_read_desc, (VOPFUNC)hfs_vnop_read },                        /* read */
    { &vnop_write_desc, (VOPFUNC)hfs_vnop_write },              /* write */
    { &vnop_ioctl_desc, (VOPFUNC)hfs_vnop_ioctl },              /* ioctl */
    { &vnop_select_desc, (VOPFUNC)hfs_vnop_select },            /* select */
    { &vnop_revoke_desc, (VOPFUNC)nop_revoke },                 /* revoke */
    { &vnop_exchange_desc, (VOPFUNC)hfs_vnop_exchange },                /* exchange */
    { &vnop_mmap_desc, (VOPFUNC)err_mmap },                     /* mmap */
    { &vnop_fsync_desc, (VOPFUNC)hfs_vnop_fsync },              /* fsync */
    { &vnop_remove_desc, (VOPFUNC)hfs_vnop_remove },            /* remove */
    { &vnop_link_desc, (VOPFUNC)hfs_vnop_link },                        /* link */
    { &vnop_rename_desc, (VOPFUNC)hfs_vnop_rename },            /* rename */
    { &vnop_mkdir_desc, (VOPFUNC)hfs_vnop_mkdir },             /* mkdir */
    { &vnop_rmdir_desc, (VOPFUNC)hfs_vnop_rmdir },              /* rmdir */
    { &vnop_symlink_desc, (VOPFUNC)hfs_vnop_symlink },         /* symlink */
    { &vnop_readdir_desc, (VOPFUNC)hfs_vnop_readdir },          /* readdir */
    { &vnop_readdirattr_desc, (VOPFUNC)hfs_vnop_readdirattr },  /* readdirattr */
    { &vnop_readlink_desc, (VOPFUNC)hfs_vnop_readlink },                /* readlink */
    { &vnop_inactive_desc, (VOPFUNC)hfs_vnop_inactive },                /* inactive */
    { &vnop_reclaim_desc, (VOPFUNC)hfs_vnop_reclaim },          /* reclaim */
    { &vnop_strategy_desc, (VOPFUNC)hfs_vnop_strategy },                /* strategy */
    { &vnop_pathconf_desc, (VOPFUNC)hfs_vnop_pathconf },                /* pathconf */
    { &vnop_advlock_desc, (VOPFUNC)err_advlock },               /* advlock */
    { &vnop_allocate_desc, (VOPFUNC)hfs_vnop_allocate },                /* allocate */
    { &vnop_searchfs_desc, (VOPFUNC)hfs_vnop_search },          /* search fs */
    { &vnop_bwrite_desc, (VOPFUNC)hfs_vnop_bwrite },            /* bwrite */
    { &vnop_pagein_desc, (VOPFUNC)hfs_vnop_pagein },            /* pagein */
    { &vnop_pageout_desc,(VOPFUNC) hfs_vnop_pageout },          /* pageout */
    { &vnop_copyfile_desc, (VOPFUNC)err_copyfile },             /* copyfile */
    { &vnop_blktooff_desc, (VOPFUNC)hfs_vnop_blktooff },                /* blktooff */
    { &vnop_offtoblk_desc, (VOPFUNC)hfs_vnop_offtoblk },                /* offtoblk */
    { &vnop_blockmap_desc, (VOPFUNC)hfs_vnop_blockmap },                        /* blockmap */
    { &vnop_kqfilt_add_desc, (VOPFUNC)hfs_vnop_kqfiltadd },             /* kqfilt_add */
    { &vnop_kqfilt_remove_desc, (VOPFUNC)hfs_vnop_kqfiltremove },               /* kqfilt_remove */
    { &vnop_getxattr_desc, (VOPFUNC)hfs_vnop_getxattr},
    { &vnop_setxattr_desc, (VOPFUNC)hfs_vnop_setxattr},
    { &vnop_removexattr_desc, (VOPFUNC)hfs_vnop_removexattr},
    { &vnop_listxattr_desc, (VOPFUNC)hfs_vnop_listxattr},
    { NULL, (VOPFUNC)NULL }
};

struct vnodeopv_desc hfs_vnodeop_opv_desc =
{ &hfs_vnodeop_p, hfs_vnodeop_entries };

int (**hfs_specop_p)(void *);
struct vnodeopv_entry_desc hfs_specop_entries[] = {
        { &vnop_default_desc, (VOPFUNC)vn_default_error },
        { &vnop_lookup_desc, (VOPFUNC)spec_lookup },            /* lookup */
        { &vnop_create_desc, (VOPFUNC)spec_create },            /* create */
        { &vnop_mknod_desc, (VOPFUNC)spec_mknod },              /* mknod */
        { &vnop_open_desc, (VOPFUNC)spec_open },                        /* open */
        { &vnop_close_desc, (VOPFUNC)hfsspec_close },           /* close */
        { &vnop_getattr_desc, (VOPFUNC)hfs_vnop_getattr },      /* getattr */
        { &vnop_setattr_desc, (VOPFUNC)hfs_vnop_setattr },      /* setattr */
        { &vnop_read_desc, (VOPFUNC)hfsspec_read },             /* read */
        { &vnop_write_desc, (VOPFUNC)hfsspec_write },           /* write */
        { &vnop_ioctl_desc, (VOPFUNC)spec_ioctl },              /* ioctl */
        { &vnop_select_desc, (VOPFUNC)spec_select },            /* select */
        { &vnop_revoke_desc, (VOPFUNC)spec_revoke },            /* revoke */
        { &vnop_mmap_desc, (VOPFUNC)spec_mmap },                        /* mmap */
        { &vnop_fsync_desc, (VOPFUNC)hfs_vnop_fsync },          /* fsync */
        { &vnop_remove_desc, (VOPFUNC)spec_remove },            /* remove */
        { &vnop_link_desc, (VOPFUNC)spec_link },                        /* link */
        { &vnop_rename_desc, (VOPFUNC)spec_rename },            /* rename */
        { &vnop_mkdir_desc, (VOPFUNC)spec_mkdir },              /* mkdir */
        { &vnop_rmdir_desc, (VOPFUNC)spec_rmdir },              /* rmdir */
        { &vnop_symlink_desc, (VOPFUNC)spec_symlink },          /* symlink */
        { &vnop_readdir_desc, (VOPFUNC)spec_readdir },          /* readdir */
        { &vnop_readlink_desc, (VOPFUNC)spec_readlink },                /* readlink */
        { &vnop_inactive_desc, (VOPFUNC)hfs_vnop_inactive },    /* inactive */
        { &vnop_reclaim_desc, (VOPFUNC)hfs_vnop_reclaim },      /* reclaim */
        { &vnop_strategy_desc, (VOPFUNC)spec_strategy },                /* strategy */
        { &vnop_pathconf_desc, (VOPFUNC)spec_pathconf },                /* pathconf */
        { &vnop_advlock_desc, (VOPFUNC)err_advlock },           /* advlock */
        { &vnop_bwrite_desc, (VOPFUNC)hfs_vnop_bwrite },
        { &vnop_devblocksize_desc, (VOPFUNC)spec_devblocksize }, /* devblocksize */
        { &vnop_pagein_desc, (VOPFUNC)hfs_vnop_pagein },                /* Pagein */
        { &vnop_pageout_desc, (VOPFUNC)hfs_vnop_pageout },      /* Pageout */
        { &vnop_copyfile_desc, (VOPFUNC)err_copyfile },         /* copyfile */
        { &vnop_blktooff_desc, (VOPFUNC)hfs_vnop_blktooff },    /* blktooff */
        { &vnop_offtoblk_desc, (VOPFUNC)hfs_vnop_offtoblk },    /* offtoblk */
        { (struct vnodeop_desc*)NULL, (VOPFUNC)NULL }
};
struct vnodeopv_desc hfs_specop_opv_desc =
        { &hfs_specop_p, hfs_specop_entries };

#if FIFO
int (**hfs_fifoop_p)(void *);
struct vnodeopv_entry_desc hfs_fifoop_entries[] = {
        { &vnop_default_desc, (VOPFUNC)vn_default_error },
        { &vnop_lookup_desc, (VOPFUNC)fifo_lookup },            /* lookup */
        { &vnop_create_desc, (VOPFUNC)fifo_create },            /* create */
        { &vnop_mknod_desc, (VOPFUNC)fifo_mknod },              /* mknod */
        { &vnop_open_desc, (VOPFUNC)fifo_open },                        /* open */
        { &vnop_close_desc, (VOPFUNC)hfsfifo_close },           /* close */
        { &vnop_getattr_desc, (VOPFUNC)hfs_vnop_getattr },      /* getattr */
        { &vnop_setattr_desc, (VOPFUNC)hfs_vnop_setattr },      /* setattr */
        { &vnop_read_desc, (VOPFUNC)hfsfifo_read },             /* read */
        { &vnop_write_desc, (VOPFUNC)hfsfifo_write },           /* write */
        { &vnop_ioctl_desc, (VOPFUNC)fifo_ioctl },              /* ioctl */
        { &vnop_select_desc, (VOPFUNC)fifo_select },            /* select */
        { &vnop_revoke_desc, (VOPFUNC)fifo_revoke },            /* revoke */
        { &vnop_mmap_desc, (VOPFUNC)fifo_mmap },                        /* mmap */
        { &vnop_fsync_desc, (VOPFUNC)hfs_vnop_fsync },          /* fsync */
        { &vnop_remove_desc, (VOPFUNC)fifo_remove },            /* remove */
        { &vnop_link_desc, (VOPFUNC)fifo_link },                        /* link */
        { &vnop_rename_desc, (VOPFUNC)fifo_rename },            /* rename */
        { &vnop_mkdir_desc, (VOPFUNC)fifo_mkdir },              /* mkdir */
        { &vnop_rmdir_desc, (VOPFUNC)fifo_rmdir },              /* rmdir */
        { &vnop_symlink_desc, (VOPFUNC)fifo_symlink },          /* symlink */
        { &vnop_readdir_desc, (VOPFUNC)fifo_readdir },          /* readdir */
        { &vnop_readlink_desc, (VOPFUNC)fifo_readlink },                /* readlink */
        { &vnop_inactive_desc, (VOPFUNC)hfs_vnop_inactive },    /* inactive */
        { &vnop_reclaim_desc, (VOPFUNC)hfs_vnop_reclaim },      /* reclaim */
        { &vnop_strategy_desc, (VOPFUNC)fifo_strategy },                /* strategy */
        { &vnop_pathconf_desc, (VOPFUNC)fifo_pathconf },                /* pathconf */
        { &vnop_advlock_desc, (VOPFUNC)err_advlock },           /* advlock */
        { &vnop_bwrite_desc, (VOPFUNC)hfs_vnop_bwrite },
        { &vnop_pagein_desc, (VOPFUNC)hfs_vnop_pagein },                /* Pagein */
        { &vnop_pageout_desc, (VOPFUNC)hfs_vnop_pageout },      /* Pageout */
        { &vnop_copyfile_desc, (VOPFUNC)err_copyfile },                 /* copyfile */
        { &vnop_blktooff_desc, (VOPFUNC)hfs_vnop_blktooff },    /* blktooff */
        { &vnop_offtoblk_desc, (VOPFUNC)hfs_vnop_offtoblk },    /* offtoblk */
        { &vnop_blockmap_desc, (VOPFUNC)hfs_vnop_blockmap },            /* blockmap */
        { &vnop_kqfilt_add_desc, (VOPFUNC)hfsfifo_kqfilt_add },  /* kqfilt_add */
        { &vnop_kqfilt_remove_desc, (VOPFUNC)hfsfifo_kqfilt_remove },  /* kqfilt_remove */
        { (struct vnodeop_desc*)NULL, (VOPFUNC)NULL }
};
struct vnodeopv_desc hfs_fifoop_opv_desc =
        { &hfs_fifoop_p, hfs_fifoop_entries };
#endif /* FIFO */