xnu-792.12.6.tar.gz

[apple/xnu.git] / bsd / ufs / ffs / ffs_vnops.c

/*
 * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
 * 
 * @APPLE_LICENSE_OSREFERENCE_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_LICENSE_OSREFERENCE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1982, 1986, 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95
 */

#include <rev_endian_fs.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/mount_internal.h>
#include <sys/vnode_internal.h>
#include <sys/malloc.h>
#include <sys/ubc.h>
#include <sys/quota.h>

#include <sys/vm.h>
#include <vfs/vfs_support.h>

#include <miscfs/specfs/specdev.h>
#include <miscfs/fifofs/fifo.h>

#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>

#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#if REV_ENDIAN_FS
#include <ufs/ufs/ufs_byte_order.h>
#include <architecture/byte_order.h>
#endif /* REV_ENDIAN_FS */

#define VOPFUNC int (*)(void *)

/* Global vfs data structures for ufs. */
int (**ffs_vnodeop_p)(void *);
struct vnodeopv_entry_desc ffs_vnodeop_entries[] = {
        { &vnop_default_desc, (VOPFUNC)vn_default_error },
        { &vnop_lookup_desc, (VOPFUNC)ufs_lookup },             /* lookup */
        { &vnop_create_desc, (VOPFUNC)ufs_create },             /* create */
        { &vnop_whiteout_desc, (VOPFUNC)ufs_whiteout },         /* whiteout */
        { &vnop_mknod_desc, (VOPFUNC)ufs_mknod },               /* mknod */
        { &vnop_open_desc, (VOPFUNC)ufs_open },                 /* open */
        { &vnop_close_desc, (VOPFUNC)ufs_close },               /* close */
        { &vnop_getattr_desc, (VOPFUNC)ufs_getattr },           /* getattr */
        { &vnop_setattr_desc, (VOPFUNC)ufs_setattr },           /* setattr */
        { &vnop_read_desc, (VOPFUNC)ffs_read },                 /* read */
        { &vnop_write_desc, (VOPFUNC)ffs_write },               /* write */
        { &vnop_ioctl_desc, (VOPFUNC)ufs_ioctl },               /* ioctl */
        { &vnop_select_desc, (VOPFUNC)ufs_select },             /* select */
        { &vnop_revoke_desc, (VOPFUNC)ufs_revoke },             /* revoke */
        { &vnop_mmap_desc, (VOPFUNC)ufs_mmap },                 /* mmap */
        { &vnop_fsync_desc, (VOPFUNC)ffs_fsync },               /* fsync */
        { &vnop_remove_desc, (VOPFUNC)ufs_remove },             /* remove */
        { &vnop_link_desc, (VOPFUNC)ufs_link },                 /* link */
        { &vnop_rename_desc, (VOPFUNC)ufs_rename },             /* rename */
        { &vnop_mkdir_desc, (VOPFUNC)ufs_mkdir },               /* mkdir */
        { &vnop_rmdir_desc, (VOPFUNC)ufs_rmdir },               /* rmdir */
        { &vnop_symlink_desc, (VOPFUNC)ufs_symlink },           /* symlink */
        { &vnop_readdir_desc, (VOPFUNC)ufs_readdir },           /* readdir */
        { &vnop_readlink_desc, (VOPFUNC)ufs_readlink },         /* readlink */
        { &vnop_inactive_desc, (VOPFUNC)ufs_inactive },         /* inactive */
        { &vnop_reclaim_desc, (VOPFUNC)ffs_reclaim },           /* reclaim */
        { &vnop_strategy_desc, (VOPFUNC)ufs_strategy },         /* strategy */
        { &vnop_pathconf_desc, (VOPFUNC)ufs_pathconf },         /* pathconf */
        { &vnop_advlock_desc, (VOPFUNC)err_advlock },           /* advlock */
        { &vnop_bwrite_desc, (VOPFUNC)vn_bwrite },
        { &vnop_pagein_desc, (VOPFUNC)ffs_pagein },             /* Pagein */
        { &vnop_pageout_desc, (VOPFUNC)ffs_pageout },           /* Pageout */
        { &vnop_copyfile_desc, (VOPFUNC)err_copyfile },         /* Copy File */
        { &vnop_blktooff_desc, (VOPFUNC)ffs_blktooff },         /* blktooff */
        { &vnop_offtoblk_desc, (VOPFUNC)ffs_offtoblk },         /* offtoblk */
        { &vnop_blockmap_desc, (VOPFUNC)ufs_blockmap },         /* blockmap */
        { &vnop_kqfilt_add_desc, (VOPFUNC)ufs_kqfilt_add },  /* kqfilt_add */
        { (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc ffs_vnodeop_opv_desc =
        { &ffs_vnodeop_p, ffs_vnodeop_entries };

int (**ffs_specop_p)(void *);
struct vnodeopv_entry_desc ffs_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)ufsspec_close },           /* close */
        { &vnop_getattr_desc, (VOPFUNC)ufs_getattr },           /* getattr */
        { &vnop_setattr_desc, (VOPFUNC)ufs_setattr },           /* setattr */
        { &vnop_read_desc, (VOPFUNC)ufsspec_read },             /* read */
        { &vnop_write_desc, (VOPFUNC)ufsspec_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)ffs_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)ufs_inactive },         /* inactive */
        { &vnop_reclaim_desc, (VOPFUNC)ffs_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)vn_bwrite },
        { &vnop_devblocksize_desc, (VOPFUNC)spec_devblocksize },        /* devblocksize */
        { &vnop_pagein_desc, (VOPFUNC)ffs_pagein },             /* Pagein */
        { &vnop_pageout_desc, (VOPFUNC)ffs_pageout },           /* Pageout */
        { &vnop_copyfile_desc, (VOPFUNC)err_copyfile },         /* Copy File */
        { &vnop_blktooff_desc, (VOPFUNC)ffs_blktooff },         /* blktooff */
        { &vnop_offtoblk_desc, (VOPFUNC)ffs_offtoblk },         /* offtoblk */
        { &vnop_blockmap_desc, (VOPFUNC)spec_blockmap },        /* blockmap */
        { (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc ffs_specop_opv_desc =
        { &ffs_specop_p, ffs_specop_entries };

#if FIFO
int (**ffs_fifoop_p)(void *);
struct vnodeopv_entry_desc ffs_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)ufsfifo_close },           /* close */
        { &vnop_getattr_desc, (VOPFUNC)ufs_getattr },           /* getattr */
        { &vnop_setattr_desc, (VOPFUNC)ufs_setattr },           /* setattr */
        { &vnop_read_desc, (VOPFUNC)ufsfifo_read },             /* read */
        { &vnop_write_desc, (VOPFUNC)ufsfifo_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)ffs_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)ufs_inactive },         /* inactive */
        { &vnop_reclaim_desc, (VOPFUNC)ffs_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)vn_bwrite },
        { &vnop_pagein_desc, (VOPFUNC)ffs_pagein },             /* Pagein */
        { &vnop_pageout_desc, (VOPFUNC)ffs_pageout },           /* Pageout */
        { &vnop_copyfile_desc, (VOPFUNC)err_copyfile },         /*  Copy File */
        { &vnop_blktooff_desc, (VOPFUNC)ffs_blktooff },         /* blktooff */
        { &vnop_offtoblk_desc, (VOPFUNC)ffs_offtoblk },         /* offtoblk */
        { &vnop_blockmap_desc, (VOPFUNC)ufs_blockmap },         /* blockmap */
        { &vnop_kqfilt_add_desc, (VOPFUNC)ufsfifo_kqfilt_add },  /* kqfilt_add */
        { (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc ffs_fifoop_opv_desc =
        { &ffs_fifoop_p, ffs_fifoop_entries };
#endif /* FIFO */

/*
 * Enabling cluster read/write operations.
 */
int doclusterread = 0;
int doclusterwrite = 0;

#include <ufs/ufs/ufs_readwrite.c>

/*
 * Synch an open file.
 */
/* ARGSUSED */
int
ffs_fsync(ap)
        struct vnop_fsync_args /* {
                struct vnode *a_vp;
                int a_waitfor;
                vfs_context_t a_context;
        } */ *ap;
{
        return(ffs_fsync_internal(ap->a_vp, ap->a_waitfor));
}


int
ffs_fsync_internal(vnode_t vp, int waitfor)
{
        struct timeval tv;
        int wait = (waitfor == MNT_WAIT);

        /*
         * Write out any clusters.
         */
        cluster_push(vp, 0);

        /*
         * Flush all dirty buffers associated with a vnode.
         */
        buf_flushdirtyblks(vp, wait, 0, (char *)"ffs_fsync");
        microtime(&tv);

        return (ffs_update(vp, &tv, &tv, wait));
}

/*
 * Reclaim an inode so that it can be used for other purposes.
 */
int
ffs_reclaim(ap)
        struct vnop_reclaim_args /* {
                struct vnode *a_vp;
                vfs_context_t a_context;
        } */ *ap;
{
        register struct vnode *vp = ap->a_vp;
        int error;

        if ( (error = ufs_reclaim(vp, vfs_context_proc(ap->a_context))) )
                return (error);

        FREE_ZONE(vnode_fsnode(vp), sizeof (struct inode), M_FFSNODE);

        vnode_clearfsnode(vp);

        return (0);
}

/* Blktooff converts a logical block number to a file offset */
int
ffs_blktooff(ap)
        struct vnop_blktooff_args /* {
                struct vnode *a_vp;
                daddr64_t a_lblkno;
                off_t *a_offset;    
        } */ *ap;
{
        register struct inode *ip;
        register FS *fs;

        if (ap->a_vp == NULL)
                return (EINVAL);

        fs = VTOI(ap->a_vp)->I_FS;

        *ap->a_offset = (off_t)lblktosize(fs, ap->a_lblkno);

        return (0);
}

/* Blktooff converts a logical block number to a file offset */
int
ffs_offtoblk(ap)
        struct vnop_offtoblk_args /* {
                struct vnode *a_vp;
                off_t a_offset;    
                daddr64_t *a_lblkno;
        } */ *ap;
{
        register FS *fs;

        if (ap->a_vp == NULL)
                return (EINVAL);

        fs = VTOI(ap->a_vp)->I_FS;

        *ap->a_lblkno = (daddr64_t)lblkno(fs, ap->a_offset);

        return (0);
}