| Current Path : /sys/fs/udf/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //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: release/9.1.0/sys/fs/udf/udf_vnops.c 233353 2012-03-23 11:26:54Z kib $
*/
/* 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/conf.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/fifofs/fifo.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 vop_access_t udf_access;
static vop_getattr_t udf_getattr;
static vop_open_t udf_open;
static vop_ioctl_t udf_ioctl;
static vop_pathconf_t udf_pathconf;
static vop_print_t udf_print;
static vop_read_t udf_read;
static vop_readdir_t udf_readdir;
static vop_readlink_t udf_readlink;
static vop_setattr_t udf_setattr;
static vop_strategy_t udf_strategy;
static vop_bmap_t udf_bmap;
static vop_cachedlookup_t udf_lookup;
static vop_reclaim_t udf_reclaim;
static vop_vptofh_t udf_vptofh;
static int udf_readatoffset(struct udf_node *node, int *size, off_t offset,
struct buf **bp, uint8_t **data);
static int udf_bmap_internal(struct udf_node *node, off_t offset,
daddr_t *sector, uint32_t *max_size);
static struct vop_vector udf_vnodeops = {
.vop_default = &default_vnodeops,
.vop_access = udf_access,
.vop_bmap = udf_bmap,
.vop_cachedlookup = udf_lookup,
.vop_getattr = udf_getattr,
.vop_ioctl = udf_ioctl,
.vop_lookup = vfs_cache_lookup,
.vop_open = udf_open,
.vop_pathconf = udf_pathconf,
.vop_print = udf_print,
.vop_read = udf_read,
.vop_readdir = udf_readdir,
.vop_readlink = udf_readlink,
.vop_reclaim = udf_reclaim,
.vop_setattr = udf_setattr,
.vop_strategy = udf_strategy,
.vop_vptofh = udf_vptofh,
};
struct vop_vector udf_fifoops = {
.vop_default = &fifo_specops,
.vop_access = udf_access,
.vop_getattr = udf_getattr,
.vop_print = udf_print,
.vop_reclaim = udf_reclaim,
.vop_setattr = udf_setattr,
.vop_vptofh = udf_vptofh,
};
MALLOC_DEFINE(M_UDFFID, "udf_fid", "UDF FileId structure");
MALLOC_DEFINE(M_UDFDS, "udf_ds", "UDF Dirstream structure");
#define UDF_INVALID_BMAP -1
int
udf_allocv(struct mount *mp, struct vnode **vpp, struct thread *td)
{
int error;
struct vnode *vp;
error = getnewvnode("udf", mp, &udf_vnodeops, &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;
accmode_t accmode;
mode_t mode;
vp = a->a_vp;
node = VTON(vp);
accmode = a->a_accmode;
if (accmode & 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,
accmode, a->a_cred, NULL));
}
static int
udf_open(struct vop_open_args *ap) {
struct udf_node *np = VTON(ap->a_vp);
off_t fsize;
fsize = le64toh(np->fentry->inf_len);
vnode_create_vobject(ap->a_vp, fsize, ap->a_td);
return 0;
}
static const int mon_lens[2][12] = {
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334},
{0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335}
};
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;
}
/*
* Timezone calculation compliments of Julian Elischer <julian@elischer.org>.
*/
static void
udf_timetotimespec(struct timestamp *time, struct timespec *t)
{
int i, lpyear, daysinyear, year, startyear;
union {
uint16_t u_tz_offset;
int16_t s_tz_offset;
} tz;
/*
* DirectCD seems to like using bogus year values.
* Don't trust time->month as it will be used for an array index.
*/
year = le16toh(time->year);
if (year < 1970 || time->month < 1 || time->month > 12) {
t->tv_sec = 0;
t->tv_nsec = 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 - 1) * 3600 * 24;
/* Calculate the month */
lpyear = udf_isaleapyear(year);
t->tv_sec += mon_lens[lpyear][time->month - 1] * 3600 * 24;
/* Speed up the calculation */
startyear = 1970;
if (year > 2009) {
t->tv_sec += 1262304000;
startyear += 40;
} else if (year > 1999) {
t->tv_sec += 946684800;
startyear += 30;
} else if (year > 1989) {
t->tv_sec += 631152000;
startyear += 20;
} else if (year > 1979) {
t->tv_sec += 315532800;
startyear += 10;
}
daysinyear = (year - startyear) * 365;
for (i = startyear; i < year; i++)
daysinyear += udf_isaleapyear(i);
t->tv_sec += daysinyear * 3600 * 24;
/* Calculate microseconds */
t->tv_nsec = time->centisec * 10000 + time->hund_usec * 100 +
time->usec;
/*
* Calculate the time zone. The timezone is 12 bit signed 2's
* complement, 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 ((le16toh(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->udfmp->im_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 = NODEV;
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);
}
static int
udf_setattr(struct vop_setattr_args *a)
{
struct vnode *vp;
struct vattr *vap;
vp = a->a_vp;
vap = a->a_vap;
if (vap->va_flags != (u_long)VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL)
return (EROFS);
if (vap->va_size != (u_quad_t)VNOVAL) {
switch (vp->v_type) {
case VDIR:
return (EISDIR);
case VLNK:
case VREG:
return (EROFS);
case VCHR:
case VBLK:
case VSOCK:
case VFIFO:
case VNON:
case VBAD:
case VMARKER:
return (0);
}
}
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_print(struct vop_print_args *ap)
{
struct vnode *vp = ap->a_vp;
struct udf_node *node = VTON(vp);
printf(" ino %lu, on dev %s", (u_long)node->hash_id,
devtoname(node->udfmp->im_dev));
if (vp->v_type == VFIFO)
fifo_printinfo(vp);
printf("\n");
return (0);
}
#define lblkno(udfmp, loc) ((loc) >> (udfmp)->bshift)
#define blkoff(udfmp, loc) ((loc) & (udfmp)->bmask)
#define lblktosize(udfmp, blk) ((blk) << (udfmp)->bshift)
static inline int
is_data_in_fentry(const struct udf_node *node)
{
const struct file_entry *fentry = node->fentry;
return ((le16toh(fentry->icbtag.flags) & 0x7) == 3);
}
static int
udf_read(struct vop_read_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct udf_node *node = VTON(vp);
struct udf_mnt *udfmp;
struct file_entry *fentry;
struct buf *bp;
uint8_t *data;
daddr_t lbn, rablock;
off_t diff, fsize;
ssize_t n;
int error = 0;
long size, on;
if (uio->uio_resid == 0)
return (0);
if (uio->uio_offset < 0)
return (EINVAL);
if (is_data_in_fentry(node)) {
fentry = node->fentry;
data = &fentry->data[le32toh(fentry->l_ea)];
fsize = le32toh(fentry->l_ad);
n = uio->uio_resid;
diff = fsize - uio->uio_offset;
if (diff <= 0)
return (0);
if (diff < n)
n = diff;
error = uiomove(data + uio->uio_offset, (int)n, uio);
return (error);
}
fsize = le64toh(node->fentry->inf_len);
udfmp = node->udfmp;
do {
lbn = lblkno(udfmp, uio->uio_offset);
on = blkoff(udfmp, uio->uio_offset);
n = min((u_int)(udfmp->bsize - on),
uio->uio_resid);
diff = fsize - uio->uio_offset;
if (diff <= 0)
return (0);
if (diff < n)
n = diff;
size = udfmp->bsize;
rablock = lbn + 1;
if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
if (lblktosize(udfmp, rablock) < fsize) {
error = cluster_read(vp, fsize, lbn, size, NOCRED,
uio->uio_resid, (ap->a_ioflag >> 16), &bp);
} else {
error = bread(vp, lbn, size, NOCRED, &bp);
}
} else {
error = bread(vp, lbn, size, NOCRED, &bp);
}
n = min(n, size - bp->b_resid);
if (error) {
brelse(bp);
return (error);
}
error = uiomove(bp->b_data + on, (int)n, uio);
brelse(bp);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
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, destlen;
ssize_t unilen = 0;
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 = (ssize_t)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 = (ssize_t)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 = (int)unilen;
}
return (destlen);
}
/*
* Compare a CS0 dstring with a name passed in from the VFS layer. Return
* 0 on a successful match, nonzero otherwise. 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.
*/
ds->buf = malloc(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->offset + 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;
cookies = malloc(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_name[1] = '\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_name[2] = '\0';
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)
break;
uio->uio_offset = ds->offset + ds->off;
}
/* tell the calling layer whether we need to be called again */
*a->a_eofflag = uiodir.eofflag;
if (error < 0)
error = 0;
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);
}
static int
udf_readlink(struct vop_readlink_args *ap)
{
struct path_component *pc, *end;
struct vnode *vp;
struct uio uio;
struct iovec iov[1];
struct udf_node *node;
void *buf;
char *cp;
int error, len, root;
/*
* A symbolic link in UDF is a list of variable-length path
* component structures. We build a pathname in the caller's
* uio by traversing this list.
*/
vp = ap->a_vp;
node = VTON(vp);
len = le64toh(node->fentry->inf_len);
buf = malloc(len, M_DEVBUF, M_WAITOK);
iov[0].iov_len = len;
iov[0].iov_base = buf;
uio.uio_iov = iov;
uio.uio_iovcnt = 1;
uio.uio_offset = 0;
uio.uio_resid = iov[0].iov_len;
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_READ;
uio.uio_td = curthread;
error = VOP_READ(vp, &uio, 0, ap->a_cred);
if (error)
goto error;
pc = buf;
end = (void *)((char *)buf + len);
root = 0;
while (pc < end) {
switch (pc->type) {
case UDF_PATH_ROOT:
/* Only allow this at the beginning of a path. */
if ((void *)pc != buf) {
error = EINVAL;
goto error;
}
cp = "/";
len = 1;
root = 1;
break;
case UDF_PATH_DOT:
cp = ".";
len = 1;
break;
case UDF_PATH_DOTDOT:
cp = "..";
len = 2;
break;
case UDF_PATH_PATH:
if (pc->length == 0) {
error = EINVAL;
goto error;
}
/*
* XXX: We only support CS8 which appears to map
* to ASCII directly.
*/
switch (pc->identifier[0]) {
case 8:
cp = pc->identifier + 1;
len = pc->length - 1;
break;
default:
error = EOPNOTSUPP;
goto error;
}
break;
default:
error = EINVAL;
goto error;
}
/*
* If this is not the first component, insert a path
* separator.
*/
if (pc != buf) {
/* If we started with root we already have a "/". */
if (root)
goto skipslash;
root = 0;
if (ap->a_uio->uio_resid < 1) {
error = ENAMETOOLONG;
goto error;
}
error = uiomove("/", 1, ap->a_uio);
if (error)
break;
}
skipslash:
/* Append string at 'cp' of length 'len' to our path. */
if (len > ap->a_uio->uio_resid) {
error = ENAMETOOLONG;
goto error;
}
error = uiomove(cp, len, ap->a_uio);
if (error)
break;
/* Advance to next component. */
pc = (void *)((char *)pc + 4 + pc->length);
}
error:
free(buf, M_DEVBUF);
return (error);
}
static int
udf_strategy(struct vop_strategy_args *a)
{
struct buf *bp;
struct vnode *vp;
struct udf_node *node;
struct bufobj *bo;
off_t offset;
uint32_t maxsize;
daddr_t sector;
int error;
bp = a->a_bp;
vp = a->a_vp;
node = VTON(vp);
if (bp->b_blkno == bp->b_lblkno) {
offset = lblktosize(node->udfmp, bp->b_lblkno);
error = udf_bmap_internal(node, offset, §or, &maxsize);
if (error) {
clrbuf(bp);
bp->b_blkno = -1;
bufdone(bp);
return (0);
}
/* bmap gives sector numbers, bio works with device blocks */
bp->b_blkno = sector << (node->udfmp->bshift - DEV_BSHIFT);
}
bo = node->udfmp->im_bo;
bp->b_iooffset = dbtob(bp->b_blkno);
BO_STRATEGY(bo, bp);
return (0);
}
static int
udf_bmap(struct vop_bmap_args *a)
{
struct udf_node *node;
uint32_t max_size;
daddr_t lsector;
int nblk;
int error;
node = VTON(a->a_vp);
if (a->a_bop != NULL)
*a->a_bop = &node->udfmp->im_devvp->v_bufobj;
if (a->a_bnp == NULL)
return (0);
if (a->a_runb)
*a->a_runb = 0;
/*
* UDF_INVALID_BMAP means data embedded into fentry, this is an internal
* error that should not be propagated to calling code.
* Most obvious mapping for this error is EOPNOTSUPP as we can not truly
* translate block numbers in this case.
* Incidentally, this return code will make vnode pager to use VOP_READ
* to get data for mmap-ed pages and udf_read knows how to do the right
* thing for this kind of files.
*/
error = udf_bmap_internal(node, a->a_bn << node->udfmp->bshift,
&lsector, &max_size);
if (error == UDF_INVALID_BMAP)
return (EOPNOTSUPP);
if (error)
return (error);
/* Translate logical to physical sector number */
*a->a_bnp = lsector << (node->udfmp->bshift - DEV_BSHIFT);
/*
* Determine maximum number of readahead blocks following the
* requested block.
*/
if (a->a_runp) {
nblk = (max_size >> node->udfmp->bshift) - 1;
if (nblk <= 0)
*a->a_runp = 0;
else if (nblk >= (MAXBSIZE >> node->udfmp->bshift))
*a->a_runp = (MAXBSIZE >> node->udfmp->bshift) - 1;
else
*a->a_runp = nblk;
}
if (a->a_runb) {
*a->a_runb = 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;
u_long nameiop;
u_long flags;
char *nameptr;
long namelen;
ino_t id = 0;
int offset, error = 0;
int fsize, lkflags, ltype, numdirpasses;
dvp = a->a_dvp;
node = VTON(dvp);
udfmp = node->udfmp;
nameiop = a->a_cnp->cn_nameiop;
flags = a->a_cnp->cn_flags;
lkflags = a->a_cnp->cn_lkflags;
nameptr = a->a_cnp->cn_nameptr;
namelen = a->a_cnp->cn_namelen;
fsize = le64toh(node->fentry->inf_len);
/*
* 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/fs/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) {
/*
* 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++;
udf_closedir(ds);
if (flags & ISDOTDOT) {
error = vn_vget_ino(dvp, id, lkflags, &tdp);
} else if (node->hash_id == id) {
VREF(dvp); /* we want ourself, ie "." */
/*
* When we lookup "." we still can be asked to lock it
* differently.
*/
ltype = lkflags & LK_TYPE_MASK;
if (ltype != VOP_ISLOCKED(dvp)) {
if (ltype == LK_EXCLUSIVE)
vn_lock(dvp, LK_UPGRADE | LK_RETRY);
else /* if (ltype == LK_SHARED) */
vn_lock(dvp, LK_DOWNGRADE | LK_RETRY);
}
tdp = dvp;
} else
error = udf_vget(udfmp->im_mountp, id, lkflags, &tdp);
if (!error) {
*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;
}
udf_closedir(ds);
/* 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;
}
}
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);
/*
* Destroy the vm object and flush associated pages.
*/
vnode_destroy_vobject(vp);
if (unode != NULL) {
vfs_hash_remove(vp);
if (unode->fentry != NULL)
free(unode->fentry, M_UDFFENTRY);
uma_zfree(udf_zone_node, unode);
vp->v_data = NULL;
}
return (0);
}
static int
udf_vptofh(struct vop_vptofh_args *a)
{
struct udf_node *node;
struct ifid *ifhp;
node = VTON(a->a_vp);
ifhp = (struct ifid *)a->a_fhp;
ifhp->ifid_len = sizeof(struct ifid);
ifhp->ifid_ino = node->hash_id;
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, off_t offset,
struct buf **bp, uint8_t **data)
{
struct udf_mnt *udfmp = node->udfmp;
struct vnode *vp = node->i_vnode;
struct file_entry *fentry;
struct buf *bp1;
uint32_t max_size;
daddr_t sector;
off_t off;
int adj_size;
int error;
/*
* This call is made *not* only to detect UDF_INVALID_BMAP case,
* max_size is used as an ad-hoc read-ahead hint for "normal" case.
*/
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);
if (offset >= *size)
*size = 0;
else {
*data += offset;
*size -= offset;
}
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;
/*
* Because we will read starting at block boundary, we need to adjust
* how much we need to read so that all promised data is in.
* Also, we can't promise to read more than MAXBSIZE bytes starting
* from block boundary, so adjust what we promise too.
*/
off = blkoff(udfmp, offset);
*size = min(*size, MAXBSIZE - off);
adj_size = (*size + off + udfmp->bmask) & ~udfmp->bmask;
*bp = NULL;
if ((error = bread(vp, lblkno(udfmp, offset), adj_size, NOCRED, 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->bmask];
return (0);
}
/*
* Translate a file offset into a logical block and then into a physical
* block.
* max_size - maximum number of bytes that can be read starting from given
* offset, rather than beginning of calculated sector number
*/
static int
udf_bmap_internal(struct udf_node *node, off_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(short_ad, fentry,
le32toh(fentry->l_ea) + ad_offset);
icblen = GETICBLEN(short_ad, icb);
ad_num++;
} while(offset >= icblen);
lsector = (offset >> udfmp->bshift) +
le32toh(((struct short_ad *)(icb))->pos);
*max_size = icblen - offset;
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 = icblen - offset;
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);
}