/*-
 * Copyright (c) 2001, 2002 Scott Long <scottl@freebsd.org>
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD: src/sys/fs/udf/udf_vnops.c,v 1.33 2003/12/07 05:04:49 scottl Exp $
 */

/* udf_vnops.c */
/* Take care of the vnode side of things */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/namei.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <sys/module.h>
#include <sys/buf.h>
#include <sys/iconv.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/dirent.h>
#include <sys/queue.h>
#include <sys/unistd.h>

#include <machine/inttypes.h>

#include <sys/buf2.h>

#include <vfs/udf/ecma167-udf.h>
#include <vfs/udf/osta.h>
#include <vfs/udf/udf.h>
#include <vfs/udf/udf_mount.h>

static int udf_access(struct vop_access_args *);
static int udf_getattr(struct vop_getattr_args *);
static int udf_ioctl(struct vop_ioctl_args *);
static int udf_pathconf(struct vop_pathconf_args *);
static int udf_read(struct vop_read_args *);
static int udf_readdir(struct vop_readdir_args *);
static int udf_readlink(struct vop_readlink_args *ap);
static int udf_strategy(struct vop_strategy_args *);
static int udf_bmap(struct vop_bmap_args *);
static int udf_lookup(struct vop_old_lookup_args *);
static int udf_reclaim(struct vop_reclaim_args *);
static int udf_readatoffset(struct udf_node *, int *, int, struct buf **, uint8_t **);
static int udf_bmap_internal(struct udf_node *, uint32_t, daddr_t *, uint32_t *);

struct vop_ops udf_vnode_vops = {
        .vop_default =          vop_defaultop,
        .vop_access =           udf_access,
        .vop_bmap =             udf_bmap,
        .vop_old_lookup =       udf_lookup,
        .vop_getattr =          udf_getattr,
        .vop_ioctl =            udf_ioctl,
        .vop_pathconf =         udf_pathconf,
        .vop_read =             udf_read,
        .vop_readdir =          udf_readdir,
        .vop_readlink =         udf_readlink,
        .vop_reclaim =          udf_reclaim,
        .vop_strategy =         udf_strategy
};

MALLOC_DEFINE(M_UDFFID, "UDF FID", "UDF FileId structure");
MALLOC_DEFINE(M_UDFDS, "UDF DS", "UDF Dirstream structure");

#define UDF_INVALID_BMAP        -1

/* Look up a udf_node based on the ino_t passed in and return it's vnode */
int
udf_hashlookup(struct udf_mnt *udfmp, ino_t id, struct vnode **vpp)
{
        struct udf_node *node;
        struct udf_hash_lh *lh;
        struct vnode *vp;

        *vpp = NULL;

        lwkt_gettoken(&udfmp->hash_token);
loop:
        lh = &udfmp->hashtbl[id % udfmp->hashsz];
        if (lh == NULL) {
                lwkt_reltoken(&udfmp->hash_token);
                return(ENOENT);
        }
        LIST_FOREACH(node, lh, le) {
                if (node->hash_id != id)
                        continue;
                vp = node->i_vnode;
                if (vget(vp, LK_EXCLUSIVE))
                        goto loop;
                /*
                 * We must check to see if the inode has been ripped
                 * out from under us after blocking.
                 */
                lh = &udfmp->hashtbl[id % udfmp->hashsz];
                LIST_FOREACH(node, lh, le) {
                        if (node->hash_id == id)
                                break;
                }
                if (node == NULL || vp != node->i_vnode) {
                        vput(vp);
                        goto loop;
                }
                lwkt_reltoken(&udfmp->hash_token);
                *vpp = vp;
                return(0);
        }

        lwkt_reltoken(&udfmp->hash_token);
        return(0);
}

int
udf_hashins(struct udf_node *node)
{
        struct udf_mnt *udfmp;
        struct udf_hash_lh *lh;

        udfmp = node->udfmp;

        lwkt_gettoken(&udfmp->hash_token);
        lh = &udfmp->hashtbl[node->hash_id % udfmp->hashsz];
        LIST_INSERT_HEAD(lh, node, le);
        lwkt_reltoken(&udfmp->hash_token);

        return(0);
}

int
udf_hashrem(struct udf_node *node)
{
        struct udf_mnt *udfmp;
        struct udf_hash_lh *lh;

        udfmp = node->udfmp;

        lwkt_gettoken(&udfmp->hash_token);
        lh = &udfmp->hashtbl[node->hash_id % udfmp->hashsz];
        if (lh == NULL)
                panic("hash entry is NULL, node->hash_id= %"PRId64, node->hash_id);
        LIST_REMOVE(node, le);
        lwkt_reltoken(&udfmp->hash_token);

        return(0);
}

int
udf_allocv(struct mount *mp, struct vnode **vpp)
{
        int error;
        struct vnode *vp;

        error = getnewvnode(VT_UDF, mp, &vp, 0, 0);
        if (error) {
                kprintf("udf_allocv: failed to allocate new vnode\n");
                return(error);
        }
        vx_downgrade(vp);
        *vpp = vp;
        return(0);
}

/* Convert file entry permission (5 bits per owner/group/user) to a mode_t */
static mode_t
udf_permtomode(struct udf_node *node)
{
        uint32_t perm;
        uint32_t flags;
        mode_t mode;

        perm = node->fentry->perm;
        flags = node->fentry->icbtag.flags;

        mode = perm & UDF_FENTRY_PERM_USER_MASK;
        mode |= ((perm & UDF_FENTRY_PERM_GRP_MASK) >> 2);
        mode |= ((perm & UDF_FENTRY_PERM_OWNER_MASK) >> 4);
        mode |= ((flags & UDF_ICB_TAG_FLAGS_STICKY) << 4);
        mode |= ((flags & UDF_ICB_TAG_FLAGS_SETGID) << 6);
        mode |= ((flags & UDF_ICB_TAG_FLAGS_SETUID) << 8);

        return(mode);
}

static int
udf_access(struct vop_access_args *a)
{
        struct vnode *vp;
        struct udf_node *node;

        vp = a->a_vp;
        node = VTON(vp);
        KKASSERT(vp->v_mount->mnt_flag & MNT_RDONLY);
        return (vop_helper_access(a, node->fentry->uid, node->fentry->gid,
                                  udf_permtomode(node), 0));
}

static int mon_lens[2][12] = {
        {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
        {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
};

static int
udf_isaleapyear(int year)
{
        int i;

        i = (year % 4) ? 0 : 1;
        i &= (year % 100) ? 1 : 0;
        i |= (year % 400) ? 0 : 1;

        return(i);
}

/*
 * XXX This is just a rough hack.  Daylight savings isn't calculated and tv_nsec
 * is ignored.
 * Timezone calculation compliments of Julian Elischer <julian@elischer.org>.
 */
static void
udf_timetotimespec(struct timestamp *time, struct timespec *t)
{
        int i, lpyear, daysinyear;
        union {
                uint16_t        u_tz_offset;
                int16_t         s_tz_offset;
        } tz;

        t->tv_nsec = 0;

        /* DirectCD seems to like using bogus year values */
        if (time->year < 1970) {
                t->tv_sec = 0;
                return;
        }

        /* Calculate the time and day */
        t->tv_sec = time->second;
        t->tv_sec += time->minute * 60;
        t->tv_sec += time->hour * 3600;
        t->tv_sec += time->day * 3600 * 24;

        /* Calclulate the month */
        lpyear = udf_isaleapyear(time->year);
        for (i = 1; i < time->month; i++)
                t->tv_sec += mon_lens[lpyear][i] * 3600 * 24;

        /* Speed up the calculation */
        if (time->year > 1979)
                t->tv_sec += 315532800;
        if (time->year > 1989)
                t->tv_sec += 315619200;
        if (time->year > 1999)
                t->tv_sec += 315532800;
        for (i = 2000; i < time->year; i++) {
                daysinyear = udf_isaleapyear(i) + 365 ;
                t->tv_sec += daysinyear * 3600 * 24;
        }

        /*
         * Calculate the time zone.  The timezone is 12 bit signed 2's
         * compliment, so we gotta do some extra magic to handle it right.
         */
        tz.u_tz_offset = time->type_tz;
        tz.u_tz_offset &= 0x0fff;
        if (tz.u_tz_offset & 0x0800)
                tz.u_tz_offset |= 0xf000;       /* extend the sign to 16 bits */
        if ((time->type_tz & 0x1000) && (tz.s_tz_offset != -2047))
                t->tv_sec -= tz.s_tz_offset * 60;

        return;
}

static int
udf_getattr(struct vop_getattr_args *a)
{
        struct vnode *vp;
        struct udf_node *node;
        struct vattr *vap;
        struct file_entry *fentry;

        vp = a->a_vp;
        vap = a->a_vap;
        node = VTON(vp);
        fentry = node->fentry;

        vap->va_fsid = devid_from_dev(node->i_dev);
        vap->va_fileid = node->hash_id;
        vap->va_mode = udf_permtomode(node);
        vap->va_nlink = fentry->link_cnt;
        /*
         * XXX The spec says that -1 is valid for uid/gid and indicates an
         * invalid uid/gid.  How should this be represented?
         */
        vap->va_uid = (fentry->uid == 0xffffffff) ? 0 : fentry->uid;
        vap->va_gid = (fentry->gid == 0xffffffff) ? 0 : fentry->gid;
        udf_timetotimespec(&fentry->atime, &vap->va_atime);
        udf_timetotimespec(&fentry->mtime, &vap->va_mtime);
        vap->va_ctime = vap->va_mtime; /* XXX Stored as an Extended Attribute */
        vap->va_rmajor = VNOVAL;
        vap->va_rminor = VNOVAL;
        if (vp->v_type & VDIR) {
                /*
                 * Directories that are recorded within their ICB will show
                 * as having 0 blocks recorded.  Since tradition dictates
                 * that directories consume at least one logical block,
                 * make it appear so.
                 */
                if (fentry->logblks_rec != 0)
                        vap->va_size = fentry->logblks_rec * node->udfmp->bsize;
                else
                        vap->va_size = node->udfmp->bsize;
        } else
                vap->va_size = fentry->inf_len;
        vap->va_flags = 0;
        vap->va_gen = 1;
        vap->va_blocksize = node->udfmp->bsize;
        vap->va_bytes = fentry->inf_len;
        vap->va_type = vp->v_type;
        vap->va_filerev = 0; /* XXX */
        return(0);
}

/*
 * File specific ioctls.  DeCSS candidate?
 */
static int
udf_ioctl(struct vop_ioctl_args *a)
{
        kprintf("%s called\n", __func__);
        return(ENOTTY);
}

/*
 * I'm not sure that this has much value in a read-only filesystem, but
 * cd9660 has it too.
 */
static int
udf_pathconf(struct vop_pathconf_args *a)
{

        switch (a->a_name) {
        case _PC_LINK_MAX:
                *a->a_retval = 65535;
                return(0);
        case _PC_NAME_MAX:
                *a->a_retval = NAME_MAX;
                return(0);
        case _PC_PATH_MAX:
                *a->a_retval = PATH_MAX;
                return(0);
        case _PC_NO_TRUNC:
                *a->a_retval = 1;
                return(0);
        default:
                return(EINVAL);
        }
}

static int
udf_read(struct vop_read_args *a)
{
        struct vnode *vp = a->a_vp;
        struct uio *uio = a->a_uio;
        struct udf_node *node = VTON(vp);
        struct buf *bp;
        uint8_t *data;
        int error = 0;
        int size, fsize, offset;

        if (uio->uio_offset < 0)
                return(EINVAL);

        fsize = node->fentry->inf_len;

        while (uio->uio_offset < fsize && uio->uio_resid > 0) {
                offset = uio->uio_offset;
                size = uio->uio_resid;
                error = udf_readatoffset(node, &size, offset, &bp, &data);
                if (error == 0)
                        error = uiomove(data, size, uio);
                if (bp != NULL)
                        brelse(bp);
                if (error)
                        break;
        }

        return(error);
}

/*
 * Call the OSTA routines to translate the name from a CS0 dstring to a
 * 16-bit Unicode String.  Hooks need to be placed in here to translate from
 * Unicode to the encoding that the kernel/user expects.  Return the length
 * of the translated string.
 */
static int
udf_transname(char *cs0string, char *destname, int len, struct udf_mnt *udfmp)
{
        unicode_t *transname;
        int i, unilen = 0, destlen;

        /* Convert 16-bit Unicode to destname */
        /* allocate a buffer big enough to hold an 8->16 bit expansion */
        transname = kmalloc(NAME_MAX * sizeof(unicode_t), M_TEMP, M_WAITOK | M_ZERO);

        if ((unilen = udf_UncompressUnicode(len, cs0string, transname)) == -1) {
                kprintf("udf: Unicode translation failed\n");
                kfree(transname, M_TEMP);
                return(0);
        }

        for (i = 0; i < unilen ; i++)
                if (transname[i] & 0xff00)
                        destname[i] = '.';      /* Fudge the 16bit chars */
                else
                        destname[i] = transname[i] & 0xff;
        kfree(transname, M_TEMP);
        destname[unilen] = 0;
        destlen = unilen;

        return(destlen);
}

/*
 * Compare a CS0 dstring with a name passed in from the VFS layer.  Return
 * 0 on a successful match, nonzero therwise.  Unicode work may need to be done
 * here also.
 */
static int
udf_cmpname(char *cs0string, char *cmpname, int cs0len, int cmplen, struct udf_mnt *udfmp)
{
        char *transname;
        int error = 0;

        /* This is overkill, but not worth creating a new zone */

        transname = kmalloc(NAME_MAX * sizeof(unicode_t), M_TEMP,
                           M_WAITOK | M_ZERO);

        cs0len = udf_transname(cs0string, transname, cs0len, udfmp);

        /* Easy check.  If they aren't the same length, they aren't equal */
        if ((cs0len == 0) || (cs0len != cmplen))
                error = -1;
        else
                error = bcmp(transname, cmpname, cmplen);

        kfree(transname, M_TEMP);
        return(error);
}

struct udf_uiodir {
        struct dirent *dirent;
        off_t *cookies;
        int ncookies;
        int acookies;
        int eofflag;
};

static struct udf_dirstream *
udf_opendir(struct udf_node *node, int offset, int fsize, struct udf_mnt *udfmp)
{
        struct udf_dirstream *ds;

        ds = kmalloc(sizeof(*ds), M_UDFDS, M_WAITOK | M_ZERO);

        ds->node = node;
        ds->offset = offset;
        ds->udfmp = udfmp;
        ds->fsize = fsize;

        return(ds);
}

static struct fileid_desc *
udf_getfid(struct udf_dirstream *ds)
{
        struct fileid_desc *fid;
        int error, frag_size = 0, total_fid_size;

        /* End of directory? */
        if (ds->offset + ds->off >= ds->fsize) {
                ds->error = 0;
                return(NULL);
        }

        /* Grab the first extent of the directory */
        if (ds->off == 0) {
                ds->size = 0;
                if (ds->bp != NULL)
                        brelse(ds->bp);
                error = udf_readatoffset(ds->node, &ds->size, ds->offset,
                    &ds->bp, &ds->data);
                if (error) {
                        ds->error = error;
                        return(NULL);
                }
        }

        /*
         * Clean up from a previous fragmented FID.
         * XXX Is this the right place for this?
         */
        if (ds->fid_fragment && ds->buf != NULL) {
                ds->fid_fragment = 0;
                kfree(ds->buf, M_UDFFID);
        }

        fid = (struct fileid_desc*)&ds->data[ds->off];

        /*
         * Check to see if the fid is fragmented. The first test
         * ensures that we don't wander off the end of the buffer
         * looking for the l_iu and l_fi fields.
         */
        if (ds->off + UDF_FID_SIZE > ds->size ||
            ds->off + fid->l_iu + fid->l_fi + UDF_FID_SIZE > ds->size) {

                /* Copy what we have of the fid into a buffer */
                frag_size = ds->size - ds->off;
                if (frag_size >= ds->udfmp->bsize) {
                        kprintf("udf: invalid FID fragment\n");
                        ds->error = EINVAL;
                        return(NULL);
                }

                /*
                 * File ID descriptors can only be at most one
                 * logical sector in size.
                 */
                ds->buf = kmalloc(ds->udfmp->bsize, M_UDFFID, M_WAITOK | M_ZERO);
                bcopy(fid, ds->buf, frag_size);

                /* Reduce all of the casting magic */
                fid = (struct fileid_desc*)ds->buf;

                if (ds->bp != NULL)
                        brelse(ds->bp);

                /* Fetch the next allocation */
                ds->offset += ds->size;
                ds->size = 0;
                error = udf_readatoffset(ds->node, &ds->size, ds->offset,
                    &ds->bp, &ds->data);
                if (error) {
                        ds->error = error;
                        return(NULL);
                }

                /*
                 * If the fragment was so small that we didn't get
                 * the l_iu and l_fi fields, copy those in.
                 */
                if (frag_size < UDF_FID_SIZE)
                        bcopy(ds->data, &ds->buf[frag_size],
                            UDF_FID_SIZE - frag_size);

                /*
                 * Now that we have enough of the fid to work with,
                 * copy in the rest of the fid from the new
                 * allocation.
                 */
                total_fid_size = UDF_FID_SIZE + fid->l_iu + fid->l_fi;
                if (total_fid_size > ds->udfmp->bsize) {
                        kprintf("udf: invalid FID\n");
                        ds->error = EIO;
                        return(NULL);
                }
                bcopy(ds->data, &ds->buf[frag_size],
                    total_fid_size - frag_size);

                ds->fid_fragment = 1;
        } else
                total_fid_size = fid->l_iu + fid->l_fi + UDF_FID_SIZE;

        /*
         * Update the offset. Align on a 4 byte boundary because the
         * UDF spec says so.
         */
        ds->this_off = ds->off;
        if (!ds->fid_fragment)
                ds->off += (total_fid_size + 3) & ~0x03;
        else
                ds->off = (total_fid_size - frag_size + 3) & ~0x03;

        return(fid);
}

static void
udf_closedir(struct udf_dirstream *ds)
{

        if (ds->bp != NULL)
                brelse(ds->bp);

        if (ds->fid_fragment && ds->buf != NULL)
                kfree(ds->buf, M_UDFFID);

        kfree(ds, M_UDFDS);
}

static int
udf_readdir(struct vop_readdir_args *a)
{
        struct vnode *vp;
        struct uio *uio;
        struct udf_node *node;
        struct udf_mnt *udfmp;
        struct fileid_desc *fid;
        struct udf_uiodir uiodir;
        struct udf_dirstream *ds;
        off_t *cookies = NULL;
        int ncookies;
        int error = 0;
        char *name;

        vp = a->a_vp;

        error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_FAILRECLAIM);
        if (error)
                return (error);

        uio = a->a_uio;
        node = VTON(vp);
        udfmp = node->udfmp;
        uiodir.eofflag = 1;

        if (a->a_ncookies != NULL) {
                /*
                 * Guess how many entries are needed.  If we run out, this
                 * function will be called again and thing will pick up were
                 * it left off.
                 */
                ncookies = uio->uio_resid / 8 + 1;
                if (ncookies > 1024)
                        ncookies = 1024;
                cookies = kmalloc(sizeof(off_t) * ncookies, M_TEMP, M_WAITOK);
                uiodir.ncookies = ncookies;
                uiodir.cookies = cookies;
                uiodir.acookies = 0;
        } else {
                uiodir.cookies = NULL;
                uiodir.ncookies = 0;
        }

        /*
         * Iterate through the file id descriptors.  Give the parent dir
         * entry special attention.
         */
        ds = udf_opendir(node, uio->uio_offset, node->fentry->inf_len,
                         node->udfmp);

        name = kmalloc(NAME_MAX, M_TEMP, M_WAITOK);

        while ((fid = udf_getfid(ds)) != NULL) {

                /* XXX Should we return an error on a bad fid? */
                if (udf_checktag(&fid->tag, TAGID_FID)) {
                        kprintf("Invalid FID tag\n");
                        error = EIO;
                        break;
                }

                /* Is this a deleted file? */
                if (fid->file_char & UDF_FILE_CHAR_DEL)
                        continue;

                if ((fid->l_fi == 0) && (fid->file_char & UDF_FILE_CHAR_PAR)) {
                        /* Do up the '.' and '..' entries.  Dummy values are
                         * used for the cookies since the offset here is
                         * usually zero, and NFS doesn't like that value
                         */
                        if (uiodir.cookies != NULL) {
                                if (++uiodir.acookies > uiodir.ncookies) {
                                        uiodir.eofflag = 0;
                                        break;
                                }
                                *uiodir.cookies++ = 1;
                        }
                        if (vop_write_dirent(&error, uio, node->hash_id, DT_DIR,
                                             1, ".")) {
                                uiodir.eofflag = 0;
                                break;
                        }
                        if (error) {
                                uiodir.eofflag = 0;
                                break;
                        }
                        if (uiodir.cookies != NULL) {
                                if (++uiodir.acookies > uiodir.ncookies) {
                                        uiodir.eofflag = 0;
                                        break;
                                }
                                *uiodir.cookies++ = 2;
                        }
                        if (vop_write_dirent(&error, uio, udf_getid(&fid->icb),
                                             DT_DIR, 2, "..")) {
                                uiodir.eofflag = 0;
                                break;
                        }
                        if (error) {
                                uiodir.eofflag = 0;
                                break;
                        }
                } else {
                        uint8_t d_type = (fid->file_char & UDF_FILE_CHAR_DIR) ?
                            DT_DIR : DT_UNKNOWN;
                        uint16_t namelen = udf_transname(&fid->data[fid->l_iu],
                            name, fid->l_fi, udfmp);

                        if (uiodir.cookies != NULL) {
                                if (++uiodir.acookies > uiodir.ncookies) {
                                        uiodir.eofflag = 0;
                                        break;
                                }
                                *uiodir.cookies++ = ds->this_off;
                        }
                        if (vop_write_dirent(&error, uio, udf_getid(&fid->icb),
                                         d_type, namelen, name)) {
                                uiodir.eofflag = 0;
                                break;
                        }
                        if (error) {
                                uiodir.eofflag = 0;
                                break;
                        }
                }
                if (error) {
                        kprintf("uiomove returned %d\n", error);
                        break;
                }

        }

        kfree(name, M_TEMP);

        /* tell the calling layer whether we need to be called again */
        *a->a_eofflag = uiodir.eofflag;
        uio->uio_offset = ds->offset + ds->off;

        if (!error)
                error = ds->error;

        udf_closedir(ds);

        if (a->a_ncookies != NULL) {
                if (error)
                        kfree(cookies, M_TEMP);
                else {
                        *a->a_ncookies = uiodir.acookies;
                        *a->a_cookies = cookies;
                }
        }

        vn_unlock(vp);
        return(error);
}

/* Are there any implementations out there that do soft-links? */
static int
udf_readlink(struct vop_readlink_args *ap)
{
        kprintf("%s called\n", __func__);
        return(EOPNOTSUPP);
}

static int
udf_strategy(struct vop_strategy_args *ap)
{
        struct bio *bio;
        struct bio *nbio;
        struct buf *bp;
        struct vnode *vp;
        struct udf_node *node;
        int maxsize;
        daddr_t dblkno;

        bio = ap->a_bio;
        bp = bio->bio_buf;
        vp = ap->a_vp;
        node = VTON(vp);

        nbio = push_bio(bio);
        if (nbio->bio_offset == NOOFFSET) {
                /*
                 * Files that are embedded in the fentry don't translate well
                 * to a block number.  Reject.
                 */
                if (udf_bmap_internal(node,
                                     bio->bio_offset,
                                     &dblkno, &maxsize)) {
                        clrbuf(bp);
                        nbio->bio_offset = NOOFFSET;
                } else {
                        nbio->bio_offset = dbtob(dblkno);
                }
        }
        if (nbio->bio_offset == NOOFFSET) {
                /* I/O was never started on nbio, must biodone(bio) */
                biodone(bio);
                return(0);
        }
        vn_strategy(node->i_devvp, nbio);
        return(0);
}

static int
udf_bmap(struct vop_bmap_args *a)
{
        struct udf_node *node;
        uint32_t max_size;
        daddr_t lsector;
        int error;

        node = VTON(a->a_vp);

        if (a->a_doffsetp == NULL)
                return(0);

        KKASSERT(a->a_loffset % node->udfmp->bsize == 0);

        error = udf_bmap_internal(node, a->a_loffset, &lsector, &max_size);
        if (error)
                return(error);

        /* Translate logical to physical sector number */
        *a->a_doffsetp = (off_t)lsector << node->udfmp->bshift;

        /* Punt on read-ahead for now */
        if (a->a_runp)
                *a->a_runp = 0;
        if (a->a_runb)
                *a->a_runb = 0;
        return(0);
}

/*
 * The all powerful VOP_LOOKUP().
 */
static int
udf_lookup(struct vop_old_lookup_args *a)
{
        struct vnode *dvp;
        struct vnode *tdp = NULL;
        struct vnode **vpp = a->a_vpp;
        struct udf_node *node;
        struct udf_mnt *udfmp;
        struct fileid_desc *fid = NULL;
        struct udf_dirstream *ds;
        u_long nameiop;
        u_long flags;
        char *nameptr;
        long namelen;
        ino_t id = 0;
        int offset, error = 0;
        int numdirpasses, fsize;

        dvp = a->a_dvp;
        node = VTON(dvp);
        udfmp = node->udfmp;
        nameiop = a->a_cnp->cn_nameiop;
        flags = a->a_cnp->cn_flags;
        nameptr = a->a_cnp->cn_nameptr;
        namelen = a->a_cnp->cn_namelen;
        fsize = node->fentry->inf_len;

        *vpp = NULL;

        /*
         * If this is a LOOKUP and we've already partially searched through
         * the directory, pick up where we left off and flag that the
         * directory may need to be searched twice.  For a full description,
         * see /sys/isofs/cd9660/cd9660_lookup.c:cd9660_lookup()
         */
        if (nameiop != NAMEI_LOOKUP || node->diroff == 0 ||
            node->diroff > fsize) {
                offset = 0;
                numdirpasses = 1;
        } else {
                offset = node->diroff;
                numdirpasses = 2;
        }

lookloop:
        ds = udf_opendir(node, offset, fsize, udfmp);

        while ((fid = udf_getfid(ds)) != NULL) {
                /* XXX Should we return an error on a bad fid? */
                if (udf_checktag(&fid->tag, TAGID_FID)) {
                        kprintf("udf_lookup: Invalid tag\n");
                        error = EIO;
                        break;
                }

                /* Is this a deleted file? */
                if (fid->file_char & UDF_FILE_CHAR_DEL)
                        continue;

                if ((fid->l_fi == 0) && (fid->file_char & UDF_FILE_CHAR_PAR)) {
                        if (flags & CNP_ISDOTDOT) {
                                id = udf_getid(&fid->icb);
                                break;
                        }
                } else {
                        if (!(udf_cmpname(&fid->data[fid->l_iu],
                                          nameptr, fid->l_fi, namelen, udfmp))) {
                                id = udf_getid(&fid->icb);
                                break;
                        }
                }
        }

        if (!error)
                error = ds->error;

        /* XXX Bail out here? */
        if (error) {
                udf_closedir(ds);
                return (error);
        }

        /* Did we have a match? */
        if (id) {
                error = udf_vget(udfmp->im_mountp, NULL, id, &tdp);
                if (!error) {
                        /*
                         * Remember where this entry was if it's the final
                         * component.
                         */
                        if (nameiop == NAMEI_LOOKUP)
                                node->diroff = ds->offset + ds->off;
                        if ((flags & CNP_LOCKPARENT) == 0) {
                                a->a_cnp->cn_flags |= CNP_PDIRUNLOCK;
                                vn_unlock(dvp);
                        }

                        *vpp = tdp;
                }
        } else {
                /* Name wasn't found on this pass.  Do another pass? */
                if (numdirpasses == 2) {
                        numdirpasses--;
                        offset = 0;
                        udf_closedir(ds);
                        goto lookloop;
                }
                if (nameiop == NAMEI_CREATE || nameiop == NAMEI_RENAME) {
                        error = EROFS;
                } else {
                        error = ENOENT;
                }
        }

        udf_closedir(ds);
        return(error);
}

static int
udf_reclaim(struct vop_reclaim_args *a)
{
        struct vnode *vp;
        struct udf_node *unode;

        vp = a->a_vp;
        unode = VTON(vp);

        if (unode != NULL) {
                udf_hashrem(unode);
                if (unode->i_devvp) {
                        vrele(unode->i_devvp);
                        unode->i_devvp = 0;
                }

                if (unode->fentry != NULL)
                        kfree(unode->fentry, M_UDFFENTRY);
                kfree(unode, M_UDFNODE);
                vp->v_data = NULL;
        }

        return(0);
}

/*
 * Read the block and then set the data pointer to correspond with the
 * offset passed in.  Only read in at most 'size' bytes, and then set 'size'
 * to the number of bytes pointed to.  If 'size' is zero, try to read in a
 * whole extent.
 *
 * Note that *bp may be assigned error or not.
 *
 * XXX 'size' is limited to the logical block size for now due to problems
 * with udf_read()
 */
static int
udf_readatoffset(struct udf_node *node, int *size, int offset, struct buf **bp,
                 uint8_t **data)
{
        struct udf_mnt *udfmp;
        struct file_entry *fentry = NULL;
        struct buf *bp1;
        uint32_t max_size;
        daddr_t sector;
        int error;

        udfmp = node->udfmp;

        *bp = NULL;
        error = udf_bmap_internal(node, offset, &sector, &max_size);
        if (error == UDF_INVALID_BMAP) {
                /*
                 * This error means that the file *data* is stored in the
                 * allocation descriptor field of the file entry.
                 */
                fentry = node->fentry;
                *data = &fentry->data[fentry->l_ea];
                *size = fentry->l_ad;
                return(0);
        } else if (error != 0) {
                return(error);
        }

        /* Adjust the size so that it is within range */
        if (*size == 0 || *size > max_size)
                *size = max_size;
        *size = min(*size, MAXBSIZE);

        if ((error = udf_readlblks(udfmp, sector, *size, bp))) {
                kprintf("warning: udf_readlblks returned error %d\n", error);
                /* note: *bp may be non-NULL */
                return(error);
        }

        bp1 = *bp;
        *data = (uint8_t *)&bp1->b_data[offset % udfmp->bsize];
        return(0);
}

/*
 * Translate a file offset into a logical block and then into a physical
 * block.
 */
static int
udf_bmap_internal(struct udf_node *node, uint32_t offset, daddr_t *sector, uint32_t *max_size)
{
        struct udf_mnt *udfmp;
        struct file_entry *fentry;
        void *icb;
        struct icb_tag *tag;
        uint32_t icblen = 0;
        daddr_t lsector;
        int ad_offset, ad_num = 0;
        int i, p_offset;

        udfmp = node->udfmp;
        fentry = node->fentry;
        tag = &fentry->icbtag;

        switch (tag->strat_type) {
        case 4:
                break;

        case 4096:
                kprintf("Cannot deal with strategy4096 yet!\n");
                return(ENODEV);

        default:
                kprintf("Unknown strategy type %d\n", tag->strat_type);
                return(ENODEV);
        }

        switch (tag->flags & 0x7) {
        case 0:
                /*
                 * The allocation descriptor field is filled with short_ad's.
                 * If the offset is beyond the current extent, look for the
                 * next extent.
                 */
                do {
                        offset -= icblen;
                        ad_offset = sizeof(struct short_ad) * ad_num;
                        if (ad_offset > fentry->l_ad) {
                                kprintf("File offset out of bounds\n");
                                return(EINVAL);
                        }
                        icb = GETICB(long_ad, fentry, fentry->l_ea + ad_offset);
                        icblen = GETICBLEN(short_ad, icb);
                        ad_num++;
                } while(offset >= icblen);

                lsector = (offset  >> udfmp->bshift) +
                    ((struct short_ad *)(icb))->pos;

                *max_size = GETICBLEN(short_ad, icb);

                break;
        case 1:
                /*
                 * The allocation descriptor field is filled with long_ad's
                 * If the offset is beyond the current extent, look for the
                 * next extent.
                 */
                do {
                        offset -= icblen;
                        ad_offset = sizeof(struct long_ad) * ad_num;
                        if (ad_offset > fentry->l_ad) {
                                kprintf("File offset out of bounds\n");
                                return(EINVAL);
                        }
                        icb = GETICB(long_ad, fentry, fentry->l_ea + ad_offset);
                        icblen = GETICBLEN(long_ad, icb);
                        ad_num++;
                } while(offset >= icblen);

                lsector = (offset >> udfmp->bshift) +
                    ((struct long_ad *)(icb))->loc.lb_num;

                *max_size = GETICBLEN(long_ad, icb);

                break;
        case 3:
                /*
                 * This type means that the file *data* is stored in the
                 * allocation descriptor field of the file entry.
                 */
                *max_size = 0;
                *sector = node->hash_id + udfmp->part_start;

                return(UDF_INVALID_BMAP);
        case 2:
                /* DirectCD does not use extended_ad's */
        default:
                kprintf("Unsupported allocation descriptor %d\n",
                       tag->flags & 0x7);
                return(ENODEV);
        }

        *sector = lsector + udfmp->part_start;

        /*
         * Check the sparing table.  Each entry represents the beginning of
         * a packet.
         */
        if (udfmp->s_table != NULL) {
                for (i = 0; i< udfmp->s_table_entries; i++) {
                        p_offset = lsector - udfmp->s_table->entries[i].org;
                        if ((p_offset < udfmp->p_sectors) && (p_offset >= 0)) {
                                *sector = udfmp->s_table->entries[i].map +
                                    p_offset;
                                break;
                        }
                }
        }

        return(0);
}