FreeBSD-5.3/sys/fs/udf/udf_vnops.c
/*-
* 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 1.37 2004/06/23 21:49:03 scottl Exp $
*/
/* udf_vnops.c */
/* Take care of the vnode side of things */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <sys/bio.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 <sys/endian.h>
#include <vm/uma.h>
#include <fs/udf/ecma167-udf.h>
#include <fs/udf/osta.h>
#include <fs/udf/udf.h>
#include <fs/udf/udf_mount.h>
extern struct iconv_functions *udf_iconv;
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_cachedlookup_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 *);
vop_t **udf_vnodeop_p;
static struct vnodeopv_entry_desc udf_vnodeop_entries[] = {
{ &vop_default_desc, (vop_t *) vop_defaultop },
{ &vop_access_desc, (vop_t *) udf_access },
{ &vop_bmap_desc, (vop_t *) udf_bmap },
{ &vop_cachedlookup_desc, (vop_t *) udf_lookup },
{ &vop_getattr_desc, (vop_t *) udf_getattr },
{ &vop_ioctl_desc, (vop_t *) udf_ioctl },
{ &vop_lookup_desc, (vop_t *) vfs_cache_lookup },
{ &vop_pathconf_desc, (vop_t *) udf_pathconf },
{ &vop_read_desc, (vop_t *) udf_read },
{ &vop_readdir_desc, (vop_t *) udf_readdir },
{ &vop_readlink_desc, (vop_t *) udf_readlink },
{ &vop_reclaim_desc, (vop_t *) udf_reclaim },
{ &vop_strategy_desc, (vop_t *) udf_strategy },
{ NULL, NULL }
};
static struct vnodeopv_desc udf_vnodeop_opv_desc =
{ &udf_vnodeop_p, udf_vnodeop_entries };
VNODEOP_SET(udf_vnodeop_opv_desc);
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, int flags, struct vnode **vpp)
{
struct udf_node *node;
struct udf_hash_lh *lh;
int error;
*vpp = NULL;
loop:
mtx_lock(&udfmp->hash_mtx);
lh = &udfmp->hashtbl[id % udfmp->hashsz];
if (lh == NULL)
return (ENOENT);
LIST_FOREACH(node, lh, le) {
if (node->hash_id == id) {
VI_LOCK(node->i_vnode);
mtx_unlock(&udfmp->hash_mtx);
error = vget(node->i_vnode, flags | LK_INTERLOCK,
curthread);
if (error == ENOENT)
goto loop;
if (error)
return (error);
*vpp = node->i_vnode;
return (0);
}
}
mtx_unlock(&udfmp->hash_mtx);
return (0);
}
int
udf_hashins(struct udf_node *node)
{
struct udf_mnt *udfmp;
struct udf_hash_lh *lh;
udfmp = node->udfmp;
vn_lock(node->i_vnode, LK_EXCLUSIVE | LK_RETRY, curthread);
mtx_lock(&udfmp->hash_mtx);
lh = &udfmp->hashtbl[node->hash_id % udfmp->hashsz];
if (lh == NULL)
LIST_INIT(lh);
LIST_INSERT_HEAD(lh, node, le);
mtx_unlock(&udfmp->hash_mtx);
return (0);
}
int
udf_hashrem(struct udf_node *node)
{
struct udf_mnt *udfmp;
struct udf_hash_lh *lh;
udfmp = node->udfmp;
mtx_lock(&udfmp->hash_mtx);
lh = &udfmp->hashtbl[node->hash_id % udfmp->hashsz];
if (lh == NULL)
panic("hash entry is NULL, node->hash_id= %d\n", node->hash_id);
LIST_REMOVE(node, le);
mtx_unlock(&udfmp->hash_mtx);
return (0);
}
int
udf_allocv(struct mount *mp, struct vnode **vpp, struct thread *td)
{
int error;
struct vnode *vp;
error = getnewvnode("udf", mp, udf_vnodeop_p, &vp);
if (error) {
printf("udf_allocv: failed to allocate new vnode\n");
return (error);
}
*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;
uint16_t flags;
mode_t mode;
perm = le32toh(node->fentry->perm);
flags = le16toh(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;
mode_t a_mode, mode;
vp = a->a_vp;
node = VTON(vp);
a_mode = a->a_mode;
if (a_mode & VWRITE) {
switch (vp->v_type) {
case VDIR:
case VLNK:
case VREG:
return (EROFS);
/* NOT REACHED */
default:
break;
}
}
mode = udf_permtomode(node);
return (vaccess(vp->v_type, mode, node->fentry->uid, node->fentry->gid,
a_mode, a->a_cred, NULL));
}
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, year;
union {
uint16_t u_tz_offset;
int16_t s_tz_offset;
} tz;
t->tv_nsec = 0;
/* DirectCD seems to like using bogus year values */
year = le16toh(time->year);
if (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(year);
for (i = 1; i < time->month; i++)
t->tv_sec += mon_lens[lpyear][i] * 3600 * 24;
/* Speed up the calculation */
if (year > 1979)
t->tv_sec += 315532800;
if (year > 1989)
t->tv_sec += 315619200;
if (year > 1999)
t->tv_sec += 315532800;
for (i = 2000; i < 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 = le16toh(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;
struct timespec ts;
ts.tv_sec = 0;
vp = a->a_vp;
vap = a->a_vap;
node = VTON(vp);
fentry = node->fentry;
vap->va_fsid = dev2udev(node->i_dev);
vap->va_fileid = node->hash_id;
vap->va_mode = udf_permtomode(node);
vap->va_nlink = le16toh(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 = (le32toh(fentry->uid) == -1) ? 0 : le32toh(fentry->uid);
vap->va_gid = (le32toh(fentry->gid) == -1) ? 0 : le32toh(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_rdev = 0; /* XXX */
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 =
le64toh(fentry->logblks_rec) * node->udfmp->bsize;
} else {
vap->va_size = node->udfmp->bsize;
}
} else {
vap->va_size = le64toh(fentry->inf_len);
}
vap->va_flags = 0;
vap->va_gen = 1;
vap->va_blocksize = node->udfmp->bsize;
vap->va_bytes = le64toh(fentry->inf_len);
vap->va_type = vp->v_type;
vap->va_filerev = 0; /* XXX */
return (0);
}
/*
* File specific ioctls.
*/
static int
udf_ioctl(struct vop_ioctl_args *a)
{
printf("%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 = le64toh(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;
char *unibuf, *unip;
int i, unilen = 0, destlen;
size_t destleft = MAXNAMLEN;
/* Convert 16-bit Unicode to destname */
if (udfmp->im_flags & UDFMNT_KICONV && udf_iconv) {
/* allocate a buffer big enough to hold an 8->16 bit expansion */
unibuf = uma_zalloc(udf_zone_trans, M_WAITOK);
unip = unibuf;
if ((unilen = udf_UncompressUnicodeByte(len, cs0string, unibuf)) == -1) {
printf("udf: Unicode translation failed\n");
uma_zfree(udf_zone_trans, unibuf);
return 0;
}
while (unilen > 0 && destleft > 0) {
udf_iconv->conv(udfmp->im_d2l, (const char **)&unibuf,
(size_t *)&unilen, (char **)&destname, &destleft);
/* Unconverted character found */
if (unilen > 0 && destleft > 0) {
*destname++ = '?';
destleft--;
unibuf += 2;
unilen -= 2;
}
}
uma_zfree(udf_zone_trans, unip);
*destname = '\0';
destlen = MAXNAMLEN - (int)destleft;
} else {
/* allocate a buffer big enough to hold an 8->16 bit expansion */
transname = uma_zalloc(udf_zone_trans, M_WAITOK);
if ((unilen = udf_UncompressUnicode(len, cs0string, transname)) == -1) {
printf("udf: Unicode translation failed\n");
uma_zfree(udf_zone_trans, transname);
return 0;
}
for (i = 0; i < unilen ; i++) {
if (transname[i] & 0xff00) {
destname[i] = '.'; /* Fudge the 16bit chars */
} else {
destname[i] = transname[i] & 0xff;
}
}
uma_zfree(udf_zone_trans, transname);
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 = uma_zalloc(udf_zone_trans, M_WAITOK);
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);
uma_zfree(udf_zone_trans, transname);
return (error);
}
struct udf_uiodir {
struct dirent *dirent;
u_long *cookies;
int ncookies;
int acookies;
int eofflag;
};
static int
udf_uiodir(struct udf_uiodir *uiodir, int de_size, struct uio *uio, long cookie)
{
if (uiodir->cookies != NULL) {
if (++uiodir->acookies > uiodir->ncookies) {
uiodir->eofflag = 0;
return (-1);
}
*uiodir->cookies++ = cookie;
}
if (uio->uio_resid < de_size) {
uiodir->eofflag = 0;
return (-1);
}
return (uiomove(uiodir->dirent, de_size, uio));
}
static struct udf_dirstream *
udf_opendir(struct udf_node *node, int offset, int fsize, struct udf_mnt *udfmp)
{
struct udf_dirstream *ds;
ds = uma_zalloc(udf_zone_ds, 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;
error = udf_readatoffset(ds->node, &ds->size, ds->offset,
&ds->bp, &ds->data);
if (error) {
ds->error = error;
if (ds->bp != NULL)
brelse(ds->bp);
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;
FREE(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 + le16toh(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) {
printf("udf: invalid FID fragment\n");
ds->error = EINVAL;
return (NULL);
}
/*
* File ID descriptors can only be at most one
* logical sector in size.
*/
MALLOC(ds->buf, uint8_t*, 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 + le16toh(fid->l_iu) + fid->l_fi;
if (total_fid_size > ds->udfmp->bsize) {
printf("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 = le16toh(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)
FREE(ds->buf, M_UDFFID);
uma_zfree(udf_zone_ds, ds);
}
static int
udf_readdir(struct vop_readdir_args *a)
{
struct vnode *vp;
struct uio *uio;
struct dirent dir;
struct udf_node *node;
struct udf_mnt *udfmp;
struct fileid_desc *fid;
struct udf_uiodir uiodir;
struct udf_dirstream *ds;
u_long *cookies = NULL;
int ncookies;
int error = 0;
vp = a->a_vp;
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;
MALLOC(cookies, u_long *, sizeof(u_long) * ncookies,
M_TEMP, M_WAITOK);
if (cookies == NULL)
return (ENOMEM);
uiodir.ncookies = ncookies;
uiodir.cookies = cookies;
uiodir.acookies = 0;
} else {
uiodir.cookies = NULL;
}
/*
* Iterate through the file id descriptors. Give the parent dir
* entry special attention.
*/
ds = udf_opendir(node, uio->uio_offset, le64toh(node->fentry->inf_len),
node->udfmp);
while ((fid = udf_getfid(ds)) != NULL) {
/* XXX Should we return an error on a bad fid? */
if (udf_checktag(&fid->tag, TAGID_FID)) {
printf("Invalid FID tag\n");
hexdump(fid, UDF_FID_SIZE, NULL, 0);
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
*/
dir.d_fileno = node->hash_id;
dir.d_type = DT_DIR;
dir.d_name[0] = '.';
dir.d_namlen = 1;
dir.d_reclen = GENERIC_DIRSIZ(&dir);
uiodir.dirent = &dir;
error = udf_uiodir(&uiodir, dir.d_reclen, uio, 1);
if (error)
break;
dir.d_fileno = udf_getid(&fid->icb);
dir.d_type = DT_DIR;
dir.d_name[0] = '.';
dir.d_name[1] = '.';
dir.d_namlen = 2;
dir.d_reclen = GENERIC_DIRSIZ(&dir);
uiodir.dirent = &dir;
error = udf_uiodir(&uiodir, dir.d_reclen, uio, 2);
} else {
dir.d_namlen = udf_transname(&fid->data[fid->l_iu],
&dir.d_name[0], fid->l_fi, udfmp);
dir.d_fileno = udf_getid(&fid->icb);
dir.d_type = (fid->file_char & UDF_FILE_CHAR_DIR) ?
DT_DIR : DT_UNKNOWN;
dir.d_reclen = GENERIC_DIRSIZ(&dir);
uiodir.dirent = &dir;
error = udf_uiodir(&uiodir, dir.d_reclen, uio,
ds->this_off);
}
if (error) {
printf("uiomove returned %d\n", error);
break;
}
}
/* 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)
FREE(cookies, M_TEMP);
else {
*a->a_ncookies = uiodir.acookies;
*a->a_cookies = cookies;
}
}
return (error);
}
/* Are there any implementations out there that do soft-links? */
static int
udf_readlink(struct vop_readlink_args *ap)
{
printf("%s called\n", __func__);
return (EOPNOTSUPP);
}
static int
udf_strategy(struct vop_strategy_args *a)
{
struct buf *bp;
struct vnode *vp;
struct udf_node *node;
int maxsize;
bp = a->a_bp;
vp = bp->b_vp;
node = VTON(vp);
KASSERT(a->a_vp == a->a_bp->b_vp, ("%s(%p != %p)",
__func__, a->a_vp, a->a_bp->b_vp));
/* cd9660 has this test reversed, but it seems more logical this way */
if (bp->b_blkno != bp->b_lblkno) {
/*
* Files that are embedded in the fentry don't translate well
* to a block number. Reject.
*/
if (udf_bmap_internal(node, bp->b_lblkno * node->udfmp->bsize,
&bp->b_lblkno, &maxsize)) {
clrbuf(bp);
bp->b_blkno = -1;
}
}
if ((long)bp->b_blkno == -1) {
bufdone(bp);
return (0);
}
vp = node->i_devvp;
bp->b_dev = vp->v_rdev;
bp->b_iooffset = dbtob(bp->b_blkno);
VOP_SPECSTRATEGY(vp, bp);
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_vpp != NULL)
*a->a_vpp = node->i_devvp;
if (a->a_bnp == NULL)
return (0);
if (a->a_runb)
*a->a_runb = 0;
error = udf_bmap_internal(node, a->a_bn * node->udfmp->bsize, &lsector,
&max_size);
if (error)
return (error);
/* Translate logical to physical sector number */
*a->a_bnp = lsector << (node->udfmp->bshift - DEV_BSHIFT);
/* Punt on read-ahead for now */
if (a->a_runp)
*a->a_runp = 0;
return (0);
}
/*
* The all powerful VOP_LOOKUP().
*/
static int
udf_lookup(struct vop_cachedlookup_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;
struct thread *td;
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 = le64toh(node->fentry->inf_len);
td = a->a_cnp->cn_thread;
/*
* 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 != LOOKUP || node->diroff == 0 || node->diroff > fsize) {
offset = 0;
numdirpasses = 1;
} else {
offset = node->diroff;
numdirpasses = 2;
nchstats.ncs_2passes++;
}
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)) {
printf("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 & 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, id, LK_EXCLUSIVE, &tdp);
if (!error) {
/*
* Remember where this entry was if it's the final
* component.
*/
if ((flags & ISLASTCN) && nameiop == LOOKUP)
node->diroff = ds->offset + ds->off;
if (numdirpasses == 2)
nchstats.ncs_pass2++;
if (!(flags & LOCKPARENT) || !(flags & ISLASTCN)) {
a->a_cnp->cn_flags |= PDIRUNLOCK;
VOP_UNLOCK(dvp, 0, td);
}
*vpp = tdp;
/* Put this entry in the cache */
if (flags & MAKEENTRY)
cache_enter(dvp, *vpp, a->a_cnp);
}
} else {
/* Name wasn't found on this pass. Do another pass? */
if (numdirpasses == 2) {
numdirpasses--;
offset = 0;
udf_closedir(ds);
goto lookloop;
}
/* Enter name into cache as non-existant */
if (flags & MAKEENTRY)
cache_enter(dvp, *vpp, a->a_cnp);
if ((flags & ISLASTCN) &&
(nameiop == CREATE || nameiop == 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)
FREE(unode->fentry, M_UDFFENTRY);
uma_zfree(udf_zone_node, unode);
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.
*
*/
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, §or, &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[le32toh(fentry->l_ea)];
*size = le32toh(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))) {
printf("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 (le16toh(tag->strat_type)) {
case 4:
break;
case 4096:
printf("Cannot deal with strategy4096 yet!\n");
return (ENODEV);
default:
printf("Unknown strategy type %d\n", tag->strat_type);
return (ENODEV);
}
switch (le16toh(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 > le32toh(fentry->l_ad)) {
printf("File offset out of bounds\n");
return (EINVAL);
}
icb = GETICB(long_ad, fentry,
le32toh(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 > le32toh(fentry->l_ad)) {
printf("File offset out of bounds\n");
return (EINVAL);
}
icb = GETICB(long_ad, fentry,
le32toh(fentry->l_ea) + ad_offset);
icblen = GETICBLEN(long_ad, icb);
ad_num++;
} while(offset >= icblen);
lsector = (offset >> udfmp->bshift) +
le32toh(((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:
printf("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 - le32toh(udfmp->s_table->entries[i].org);
if ((p_offset < udfmp->p_sectors) && (p_offset >= 0)) {
*sector =
le32toh(udfmp->s_table->entries[i].map) +
p_offset;
break;
}
}
}
return (0);
}