xnu-517.tar.gz

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

/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * 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_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/buf.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/vnode.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/lockf.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[] = {
        { &vop_default_desc, (VOPFUNC)vn_default_error },
        { &vop_lookup_desc, (VOPFUNC)ufs_lookup },              /* lookup */
        { &vop_create_desc, (VOPFUNC)ufs_create },              /* create */
        { &vop_whiteout_desc, (VOPFUNC)ufs_whiteout },          /* whiteout */
        { &vop_mknod_desc, (VOPFUNC)ufs_mknod },                /* mknod */
        { &vop_open_desc, (VOPFUNC)ufs_open },                  /* open */
        { &vop_close_desc, (VOPFUNC)ufs_close },                /* close */
        { &vop_access_desc, (VOPFUNC)ufs_access },              /* access */
        { &vop_getattr_desc, (VOPFUNC)ufs_getattr },            /* getattr */
        { &vop_setattr_desc, (VOPFUNC)ufs_setattr },            /* setattr */
        { &vop_read_desc, (VOPFUNC)ffs_read },                  /* read */
        { &vop_write_desc, (VOPFUNC)ffs_write },                /* write */
        { &vop_lease_desc, (VOPFUNC)ufs_lease_check },          /* lease */
        { &vop_ioctl_desc, (VOPFUNC)ufs_ioctl },                /* ioctl */
        { &vop_select_desc, (VOPFUNC)ufs_select },              /* select */
        { &vop_revoke_desc, (VOPFUNC)ufs_revoke },              /* revoke */
        { &vop_mmap_desc, (VOPFUNC)ufs_mmap },                  /* mmap */
        { &vop_fsync_desc, (VOPFUNC)ffs_fsync },                /* fsync */
        { &vop_seek_desc, (VOPFUNC)ufs_seek },                  /* seek */
        { &vop_remove_desc, (VOPFUNC)ufs_remove },              /* remove */
        { &vop_link_desc, (VOPFUNC)ufs_link },                  /* link */
        { &vop_rename_desc, (VOPFUNC)ufs_rename },              /* rename */
        { &vop_mkdir_desc, (VOPFUNC)ufs_mkdir },                /* mkdir */
        { &vop_rmdir_desc, (VOPFUNC)ufs_rmdir },                /* rmdir */
        { &vop_symlink_desc, (VOPFUNC)ufs_symlink },            /* symlink */
        { &vop_readdir_desc, (VOPFUNC)ufs_readdir },            /* readdir */
        { &vop_readlink_desc, (VOPFUNC)ufs_readlink },          /* readlink */
        { &vop_abortop_desc, (VOPFUNC)nop_abortop },            /* abortop */
        { &vop_inactive_desc, (VOPFUNC)ufs_inactive },          /* inactive */
        { &vop_reclaim_desc, (VOPFUNC)ffs_reclaim },            /* reclaim */
        { &vop_lock_desc, (VOPFUNC)ufs_lock },                  /* lock */
        { &vop_unlock_desc, (VOPFUNC)ufs_unlock },              /* unlock */
        { &vop_bmap_desc, (VOPFUNC)ufs_bmap },                  /* bmap */
        { &vop_strategy_desc, (VOPFUNC)ufs_strategy },          /* strategy */
        { &vop_print_desc, (VOPFUNC)ufs_print },                /* print */
        { &vop_islocked_desc, (VOPFUNC)ufs_islocked },          /* islocked */
        { &vop_pathconf_desc, (VOPFUNC)ufs_pathconf },          /* pathconf */
        { &vop_advlock_desc, (VOPFUNC)ufs_advlock },            /* advlock */
        { &vop_blkatoff_desc, (VOPFUNC)ffs_blkatoff },          /* blkatoff */
        { &vop_valloc_desc, (VOPFUNC)ffs_valloc },              /* valloc */
        { &vop_reallocblks_desc, (VOPFUNC)ffs_reallocblks },    /* reallocblks */
        { &vop_vfree_desc, (VOPFUNC)ffs_vfree },                /* vfree */
        { &vop_truncate_desc, (VOPFUNC)ffs_truncate },          /* truncate */
        { &vop_update_desc, (VOPFUNC)ffs_update },              /* update */
        { &vop_bwrite_desc, (VOPFUNC)vn_bwrite },
        { &vop_pagein_desc, (VOPFUNC)ffs_pagein },              /* Pagein */
        { &vop_pageout_desc, (VOPFUNC)ffs_pageout },            /* Pageout */
        { &vop_copyfile_desc, (VOPFUNC)err_copyfile },          /* Copy File */
        { &vop_blktooff_desc, (VOPFUNC)ffs_blktooff },          /* blktooff */
        { &vop_offtoblk_desc, (VOPFUNC)ffs_offtoblk },          /* offtoblk */
        { &vop_cmap_desc, (VOPFUNC)ufs_cmap },                  /* cmap */
        { &vop_getattrlist_desc, (VOPFUNC)ufs_getattrlist },    /* getattrlist */
        { &vop_setattrlist_desc, (VOPFUNC)ufs_setattrlist },    /* setattrlist */
        { &vop_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[] = {
        { &vop_default_desc, (VOPFUNC)vn_default_error },
        { &vop_lookup_desc, (VOPFUNC)spec_lookup },             /* lookup */
        { &vop_create_desc, (VOPFUNC)spec_create },             /* create */
        { &vop_mknod_desc, (VOPFUNC)spec_mknod },               /* mknod */
        { &vop_open_desc, (VOPFUNC)spec_open },                 /* open */
        { &vop_close_desc, (VOPFUNC)ufsspec_close },            /* close */
        { &vop_access_desc, (VOPFUNC)ufs_access },              /* access */
        { &vop_getattr_desc, (VOPFUNC)ufs_getattr },            /* getattr */
        { &vop_setattr_desc, (VOPFUNC)ufs_setattr },            /* setattr */
        { &vop_read_desc, (VOPFUNC)ufsspec_read },              /* read */
        { &vop_write_desc, (VOPFUNC)ufsspec_write },            /* write */
        { &vop_lease_desc, (VOPFUNC)spec_lease_check },         /* lease */
        { &vop_ioctl_desc, (VOPFUNC)spec_ioctl },               /* ioctl */
        { &vop_select_desc, (VOPFUNC)spec_select },             /* select */
        { &vop_revoke_desc, (VOPFUNC)spec_revoke },             /* revoke */
        { &vop_mmap_desc, (VOPFUNC)spec_mmap },                 /* mmap */
        { &vop_fsync_desc, (VOPFUNC)ffs_fsync },                /* fsync */
        { &vop_seek_desc, (VOPFUNC)spec_seek },                 /* seek */
        { &vop_remove_desc, (VOPFUNC)spec_remove },             /* remove */
        { &vop_link_desc, (VOPFUNC)spec_link },                 /* link */
        { &vop_rename_desc, (VOPFUNC)spec_rename },             /* rename */
        { &vop_mkdir_desc, (VOPFUNC)spec_mkdir },               /* mkdir */
        { &vop_rmdir_desc, (VOPFUNC)spec_rmdir },               /* rmdir */
        { &vop_symlink_desc, (VOPFUNC)spec_symlink },           /* symlink */
        { &vop_readdir_desc, (VOPFUNC)spec_readdir },           /* readdir */
        { &vop_readlink_desc, (VOPFUNC)spec_readlink },         /* readlink */
        { &vop_abortop_desc, (VOPFUNC)spec_abortop },           /* abortop */
        { &vop_inactive_desc, (VOPFUNC)ufs_inactive },          /* inactive */
        { &vop_reclaim_desc, (VOPFUNC)ffs_reclaim },            /* reclaim */
        { &vop_lock_desc, (VOPFUNC)ufs_lock },                  /* lock */
        { &vop_unlock_desc, (VOPFUNC)ufs_unlock },              /* unlock */
        { &vop_bmap_desc, (VOPFUNC)spec_bmap },                 /* bmap */
        { &vop_strategy_desc, (VOPFUNC)spec_strategy },         /* strategy */
        { &vop_print_desc, (VOPFUNC)ufs_print },                /* print */
        { &vop_islocked_desc, (VOPFUNC)ufs_islocked },          /* islocked */
        { &vop_pathconf_desc, (VOPFUNC)spec_pathconf },         /* pathconf */
        { &vop_advlock_desc, (VOPFUNC)spec_advlock },           /* advlock */
        { &vop_blkatoff_desc, (VOPFUNC)spec_blkatoff },         /* blkatoff */
        { &vop_valloc_desc, (VOPFUNC)spec_valloc },             /* valloc */
        { &vop_reallocblks_desc, (VOPFUNC)spec_reallocblks },   /* reallocblks */
        { &vop_vfree_desc, (VOPFUNC)ffs_vfree },                /* vfree */
        { &vop_truncate_desc, (VOPFUNC)spec_truncate },         /* truncate */
        { &vop_update_desc, (VOPFUNC)ffs_update },              /* update */
        { &vop_bwrite_desc, (VOPFUNC)vn_bwrite },
        { &vop_devblocksize_desc, (VOPFUNC)spec_devblocksize }, /* devblocksize */
        { &vop_pagein_desc, (VOPFUNC)ffs_pagein },              /* Pagein */
        { &vop_pageout_desc, (VOPFUNC)ffs_pageout },            /* Pageout */
        { &vop_copyfile_desc, (VOPFUNC)err_copyfile },          /* Copy File */
        { &vop_blktooff_desc, (VOPFUNC)ffs_blktooff },          /* blktooff */
        { &vop_offtoblk_desc, (VOPFUNC)ffs_offtoblk },          /* offtoblk */
        { &vop_cmap_desc, (VOPFUNC)spec_cmap },                 /* cmap */
        { (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[] = {
        { &vop_default_desc, (VOPFUNC)vn_default_error },
        { &vop_lookup_desc, (VOPFUNC)fifo_lookup },             /* lookup */
        { &vop_create_desc, (VOPFUNC)fifo_create },             /* create */
        { &vop_mknod_desc, (VOPFUNC)fifo_mknod },               /* mknod */
        { &vop_open_desc, (VOPFUNC)fifo_open },                 /* open */
        { &vop_close_desc, (VOPFUNC)ufsfifo_close },            /* close */
        { &vop_access_desc, (VOPFUNC)ufs_access },              /* access */
        { &vop_getattr_desc, (VOPFUNC)ufs_getattr },            /* getattr */
        { &vop_setattr_desc, (VOPFUNC)ufs_setattr },            /* setattr */
        { &vop_read_desc, (VOPFUNC)ufsfifo_read },              /* read */
        { &vop_write_desc, (VOPFUNC)ufsfifo_write },            /* write */
        { &vop_lease_desc, (VOPFUNC)fifo_lease_check },         /* lease */
        { &vop_ioctl_desc, (VOPFUNC)fifo_ioctl },               /* ioctl */
        { &vop_select_desc, (VOPFUNC)fifo_select },             /* select */
        { &vop_revoke_desc, (VOPFUNC)fifo_revoke },             /* revoke */
        { &vop_mmap_desc, (VOPFUNC)fifo_mmap },                 /* mmap */
        { &vop_fsync_desc, (VOPFUNC)ffs_fsync },                /* fsync */
        { &vop_seek_desc, (VOPFUNC)fifo_seek },                 /* seek */
        { &vop_remove_desc, (VOPFUNC)fifo_remove },             /* remove */
        { &vop_link_desc, (VOPFUNC)fifo_link },                 /* link */
        { &vop_rename_desc, (VOPFUNC)fifo_rename },             /* rename */
        { &vop_mkdir_desc, (VOPFUNC)fifo_mkdir },               /* mkdir */
        { &vop_rmdir_desc, (VOPFUNC)fifo_rmdir },               /* rmdir */
        { &vop_symlink_desc, (VOPFUNC)fifo_symlink },           /* symlink */
        { &vop_readdir_desc, (VOPFUNC)fifo_readdir },           /* readdir */
        { &vop_readlink_desc, (VOPFUNC)fifo_readlink },         /* readlink */
        { &vop_abortop_desc, (VOPFUNC)fifo_abortop },           /* abortop */
        { &vop_inactive_desc, (VOPFUNC)ufs_inactive },          /* inactive */
        { &vop_reclaim_desc, (VOPFUNC)ffs_reclaim },            /* reclaim */
        { &vop_lock_desc, (VOPFUNC)ufs_lock },                  /* lock */
        { &vop_unlock_desc, (VOPFUNC)ufs_unlock },              /* unlock */
        { &vop_bmap_desc, (VOPFUNC)fifo_bmap },                 /* bmap */
        { &vop_strategy_desc, (VOPFUNC)fifo_strategy },         /* strategy */
        { &vop_print_desc, (VOPFUNC)ufs_print },                /* print */
        { &vop_islocked_desc, (VOPFUNC)ufs_islocked },          /* islocked */
        { &vop_pathconf_desc, (VOPFUNC)fifo_pathconf },         /* pathconf */
        { &vop_advlock_desc, (VOPFUNC)fifo_advlock },           /* advlock */
        { &vop_blkatoff_desc, (VOPFUNC)fifo_blkatoff },         /* blkatoff */
        { &vop_valloc_desc, (VOPFUNC)fifo_valloc },             /* valloc */
        { &vop_reallocblks_desc, (VOPFUNC)fifo_reallocblks },   /* reallocblks */
        { &vop_vfree_desc, (VOPFUNC)ffs_vfree },                /* vfree */
        { &vop_truncate_desc, (VOPFUNC)fifo_truncate },         /* truncate */
        { &vop_update_desc, (VOPFUNC)ffs_update },              /* update */
        { &vop_bwrite_desc, (VOPFUNC)vn_bwrite },
        { &vop_pagein_desc, (VOPFUNC)ffs_pagein },              /* Pagein */
        { &vop_pageout_desc, (VOPFUNC)ffs_pageout },            /* Pageout */
        { &vop_copyfile_desc, (VOPFUNC)err_copyfile },          /*  Copy File */
        { &vop_blktooff_desc, (VOPFUNC)ffs_blktooff },          /* blktooff */
        { &vop_offtoblk_desc, (VOPFUNC)ffs_offtoblk },          /* offtoblk */
        { &vop_cmap_desc, (VOPFUNC)ufs_cmap },                  /* cmap */
        { &vop_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 vop_fsync_args /* {
                struct vnode *a_vp;
                struct ucred *a_cred;
                int a_waitfor;
                struct proc *a_p;
        } */ *ap;
{
        register struct vnode *vp = ap->a_vp;
        register struct buf *bp;
        struct timeval tv;
        struct buf *nbp;
        int s;
        struct inode *ip = VTOI(vp);
        int retry = 0;

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

        /*
         * Flush all dirty buffers associated with a vnode.
         */
loop:
        s = splbio();
        for (bp = vp->v_dirtyblkhd.lh_first; bp; bp = nbp) {
                nbp = bp->b_vnbufs.le_next;
                if ((bp->b_flags & B_BUSY))
                        continue;
                if ((bp->b_flags & B_DELWRI) == 0)
                        panic("ffs_fsync: not dirty");
                bremfree(bp);
                bp->b_flags |= B_BUSY;
                splx(s);
                /*
                 * Wait for I/O associated with indirect blocks to complete,
                 * since there is no way to quickly wait for them below.
                 */
                if (bp->b_vp == vp || ap->a_waitfor == MNT_NOWAIT)
                        (void) bawrite(bp);
                else
                        (void) bwrite(bp);
                goto loop;
        }

        if (ap->a_waitfor == MNT_WAIT) {
                while (vp->v_numoutput) {
                        vp->v_flag |= VBWAIT;
                        tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "ffs_fsync", 0);
                }

                if (vp->v_dirtyblkhd.lh_first) {
                        /* still have some dirty buffers */
                        if (retry++ > 10) {
                                vprint("ffs_fsync: dirty", vp);
                                splx(s);
                                /*
                                 * Looks like the requests are not
                                 * getting queued to the driver.
                                 * Retrying here causes a cpu bound loop.
                                 * Yield to the other threads and hope
                                 * for the best.
                                 */
                                (void)tsleep((caddr_t)&vp->v_numoutput,
                                                PRIBIO + 1, "ffs_fsync", hz/10);
                                retry = 0;
                        } else {
                                splx(s);
                        }
                        /* try again */
                        goto loop;
                }
        }
        splx(s);
        tv = time;
        return (VOP_UPDATE(ap->a_vp, &tv, &tv, ap->a_waitfor == MNT_WAIT));
}

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

        if (error = ufs_reclaim(vp, ap->a_p))
                return (error);
        FREE_ZONE(vp->v_data, sizeof (struct inode),
                        VFSTOUFS(vp->v_mount)->um_devvp->v_tag == VT_MFS ?
                                        M_MFSNODE : M_FFSNODE);
        vp->v_data = NULL;
        return (0);
}

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


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

        ip = VTOI(ap->a_vp);
        fs = ip->I_FS;
        bn = ap->a_lblkno;

        if ((long)bn < 0) {
                panic("-ve blkno in ffs_blktooff");
                bn = -(long)bn;
        }

        *ap->a_offset = (off_t)lblktosize(fs, bn);
        return (0);
}

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

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

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

        *ap->a_lblkno = (daddr_t)lblkno(fs, ap->a_offset);
        return (0);
}