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NetBSD/sys/fs/udf/udf_subr.c
yamt ec5a93183a merge yamt-uio_vmspace branch. 
- use vmspace rather than proc or lwp where appropriate.
  the latter is more natural to specify an address space.
  (and less likely to be abused for random purposes.)
- fix a swdmover race.
2006-03-01 12:38:10 +00:00

2838 lines
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/* $NetBSD: udf_subr.c,v 1.5 2006/03/01 12:38:21 yamt Exp $ */
/*
* Copyright (c) 2006 Reinoud Zandijk
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the
* NetBSD Project. See http://www.NetBSD.org/ for
* information about NetBSD.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: udf_subr.c,v 1.5 2006/03/01 12:38:21 yamt Exp $");
#endif /* not lint */
#if defined(_KERNEL_OPT)
#include "opt_quota.h"
#include "opt_compat_netbsd.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <miscfs/genfs/genfs_node.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/device.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <fs/udf/ecma167-udf.h>
#include <fs/udf/udf_mount.h>
#include "udf.h"
#include "udf_subr.h"
#include "udf_bswap.h"
#define VTOI(vnode) ((struct udf_node *) vnode->v_data)
/* predefines */
#if 0
{
int i, j, dlen;
uint8_t *blob;
blob = (uint8_t *) fid;
dlen = file_size - (*offset);
printf("blob = %p\n", blob);
printf("dump of %d bytes\n", dlen);
for (i = 0; i < dlen; i+ = 16) {
printf("%04x ", i);
for (j = 0; j < 16; j++) {
if (i+j < dlen) {
printf("%02x ", blob[i+j]);
} else {
printf(" ");
};
};
for (j = 0; j < 16; j++) {
if (i+j < dlen) {
if (blob[i+j]>32 && blob[i+j]! = 127) {
printf("%c", blob[i+j]);
} else {
printf(".");
};
};
};
printf("\n");
};
printf("\n");
};
Debugger();
#endif
/* --------------------------------------------------------------------- */
/* STUB */
static int
udf_bread(struct udf_mount *ump, uint32_t sector, struct buf **bpp)
{
int sector_size = ump->discinfo.sector_size;
int blks = sector_size / DEV_BSIZE;
/* NOTE bread() checks if block is in cache or not */
return bread(ump->devvp, sector*blks, sector_size, NOCRED, bpp);
}
/* --------------------------------------------------------------------- */
/*
* Check if the blob starts with a good UDF tag. Tags are protected by a
* checksum over the reader except one byte at position 4 that is the checksum
* itself.
*/
int
udf_check_tag(void *blob)
{
struct desc_tag *tag = blob;
uint8_t *pos, sum, cnt;
/* check TAG header checksum */
pos = (uint8_t *) tag;
sum = 0;
for(cnt = 0; cnt < 16; cnt++) {
if (cnt != 4)
sum += *pos;
pos++;
}
if (sum != tag->cksum) {
/* bad tag header checksum; this is not a valid tag */
return EINVAL;
}
return 0;
}
/* --------------------------------------------------------------------- */
/*
* check tag payload will check descriptor CRC as specified.
* If the descriptor is too short, it will return EIO otherwise EINVAL.
*/
int
udf_check_tag_payload(void *blob, uint32_t max_length)
{
struct desc_tag *tag = blob;
uint16_t crc, crc_len;
crc_len = udf_rw16(tag->desc_crc_len);
/* check payload CRC if applicable */
if (crc_len == 0)
return 0;
if (crc_len > max_length)
return EIO;
crc = udf_cksum(((uint8_t *) tag) + UDF_DESC_TAG_LENGTH, crc_len);
if (crc != udf_rw16(tag->desc_crc)) {
/* bad payload CRC; this is a broken tag */
return EINVAL;
};
return 0;
}
/* --------------------------------------------------------------------- */
int
udf_validate_tag_sum(void *blob)
{
struct desc_tag *tag = blob;
uint8_t *pos, sum, cnt;
/* calculate TAG header checksum */
pos = (uint8_t *) tag;
sum = 0;
for(cnt = 0; cnt < 16; cnt++) {
if (cnt != 4) sum += *pos;
pos++;
};
tag->cksum = sum; /* 8 bit */
return 0;
}
/* --------------------------------------------------------------------- */
/* assumes sector number of descriptor to be saved allready present */
int
udf_validate_tag_and_crc_sums(void *blob)
{
struct desc_tag *tag = blob;
uint8_t *btag = (uint8_t *) tag;
uint16_t crc, crc_len;
crc_len = udf_rw16(tag->desc_crc_len);
/* check payload CRC if applicable */
if (crc_len > 0) {
crc = udf_cksum(btag + UDF_DESC_TAG_LENGTH, crc_len);
tag->desc_crc = udf_rw16(crc);
};
/* calculate TAG header checksum */
return udf_validate_tag_sum(blob);
}
/* --------------------------------------------------------------------- */
/*
* XXX note the different semantics from udfclient: for FIDs it still rounds
* up to sectors. Use udf_fidsize() for a correct length.
*/
int
udf_tagsize(union dscrptr *dscr, uint32_t udf_sector_size)
{
uint32_t size, tag_id, num_secs, elmsz;
tag_id = udf_rw16(dscr->tag.id);
switch (tag_id) {
case TAGID_LOGVOL :
size = sizeof(struct logvol_desc) - 1;
size += udf_rw32(dscr->lvd.mt_l);
break;
case TAGID_UNALLOC_SPACE :
elmsz = sizeof(struct extent_ad);
size = sizeof(struct unalloc_sp_desc) - elmsz;
size += udf_rw32(dscr->usd.alloc_desc_num) * elmsz;
break;
case TAGID_FID :
size = UDF_FID_SIZE + dscr->fid.l_fi + udf_rw16(dscr->fid.l_iu);
size = (size + 3) & ~3;
break;
case TAGID_LOGVOL_INTEGRITY :
size = sizeof(struct logvol_int_desc) - sizeof(uint32_t);
size += udf_rw32(dscr->lvid.l_iu);
size += (2 * udf_rw32(dscr->lvid.num_part) * sizeof(uint32_t));
break;
case TAGID_SPACE_BITMAP :
size = sizeof(struct space_bitmap_desc) - 1;
size += udf_rw32(dscr->sbd.num_bytes);
break;
case TAGID_SPARING_TABLE :
elmsz = sizeof(struct spare_map_entry);
size = sizeof(struct udf_sparing_table) - elmsz;
size += udf_rw16(dscr->spt.rt_l) * elmsz;
break;
case TAGID_FENTRY :
size = sizeof(struct file_entry);
size += udf_rw32(dscr->fe.l_ea) + udf_rw32(dscr->fe.l_ad)-1;
break;
case TAGID_EXTFENTRY :
size = sizeof(struct extfile_entry);
size += udf_rw32(dscr->efe.l_ea) + udf_rw32(dscr->efe.l_ad)-1;
break;
case TAGID_FSD :
size = sizeof(struct fileset_desc);
break;
default :
size = sizeof(union dscrptr);
break;
};
if ((size == 0) || (udf_sector_size == 0)) return 0;
/* round up in sectors */
num_secs = (size + udf_sector_size -1) / udf_sector_size;
return num_secs * udf_sector_size;
}
static int
udf_fidsize(struct fileid_desc *fid, uint32_t udf_sector_size)
{
uint32_t size;
if (udf_rw16(fid->tag.id) != TAGID_FID)
panic("got udf_fidsize on non FID\n");
size = UDF_FID_SIZE + fid->l_fi + udf_rw16(fid->l_iu);
size = (size + 3) & ~3;
return size;
}
/* --------------------------------------------------------------------- */
/*
* Problem with read_descriptor are long descriptors spanning more than one
* sector. Luckily long descriptors can't be in `logical space'.
*
* Size of allocated piece is returned in multiple of sector size due to
* udf_calc_udf_malloc_size().
*/
int
udf_read_descriptor(struct udf_mount *ump, uint32_t sector,
struct malloc_type *mtype, union dscrptr **dstp)
{
union dscrptr *src, *dst;
struct buf *bp;
uint8_t *pos;
int blks, blk, dscrlen;
int i, error, sector_size;
sector_size = ump->discinfo.sector_size;
*dstp = dst = NULL;
dscrlen = sector_size;
/* read initial piece */
error = udf_bread(ump, sector, &bp);
DPRINTFIF(DESCRIPTOR, error, ("read error (%d)\n", error));
if (!error) {
/* check if its a valid tag */
error = udf_check_tag(bp->b_data);
if (error) {
/* check if its an empty block */
pos = bp->b_data;
for (i = 0; i < sector_size; i++, pos++) {
if (*pos) break;
};
if (i == sector_size) {
/* return no error but with no dscrptr */
/* dispose first block */
brelse(bp);
return 0;
};
};
};
DPRINTFIF(DESCRIPTOR, error, ("bad tag checksum\n"));
if (!error) {
src = (union dscrptr *) bp->b_data;
dscrlen = udf_tagsize(src, sector_size);
dst = malloc(dscrlen, mtype, M_WAITOK);
memcpy(dst, src, dscrlen);
};
/* dispose first block */
bp->b_flags |= B_AGE;
brelse(bp);
if (!error && (dscrlen > sector_size)) {
DPRINTF(DESCRIPTOR, ("multi block descriptor read\n"));
/*
* Read the rest of descriptor. Since it is only used at mount
* time its overdone to define and use a specific udf_breadn
* for this alone.
*/
blks = (dscrlen + sector_size -1) / sector_size;
for (blk = 1; blk < blks; blk++) {
error = udf_bread(ump, sector + blk, &bp);
if (error) {
brelse(bp);
break;
};
pos = (uint8_t *) dst + blk*sector_size;
memcpy(pos, bp->b_data, sector_size);
/* dispose block */
bp->b_flags |= B_AGE;
brelse(bp);
};
DPRINTFIF(DESCRIPTOR, error, ("read error on multi (%d)\n",
error));
};
if (!error) {
error = udf_check_tag_payload(dst, dscrlen);
DPRINTFIF(DESCRIPTOR, error, ("bad payload check sum\n"));
};
if (error && dst) {
free(dst, mtype);
dst = NULL;
};
*dstp = dst;
return error;
}
/* --------------------------------------------------------------------- */
#ifdef DEBUG
static void
udf_dump_discinfo(struct udf_mount *ump)
{
char bits[128];
struct mmc_discinfo *di = &ump->discinfo;
if ((udf_verbose & UDF_DEBUG_VOLUMES) == 0)
return;
printf("Device/media info :\n");
printf("\tMMC profile 0x%02x\n", di->mmc_profile);
printf("\tderived class %d\n", di->mmc_class);
printf("\tsector size %d\n", di->sector_size);
printf("\tdisc state %d\n", di->disc_state);
printf("\tlast ses state %d\n", di->last_session_state);
printf("\tbg format state %d\n", di->bg_format_state);
printf("\tfrst track %d\n", di->first_track);
printf("\tfst on last ses %d\n", di->first_track_last_session);
printf("\tlst on last ses %d\n", di->last_track_last_session);
printf("\tlink block penalty %d\n", di->link_block_penalty);
bitmask_snprintf(di->disc_flags, MMC_DFLAGS_FLAGBITS, bits,
sizeof(bits));
printf("\tdisc flags %s\n", bits);
printf("\tdisc id %x\n", di->disc_id);
printf("\tdisc barcode %"PRIx64"\n", di->disc_barcode);
printf("\tnum sessions %d\n", di->num_sessions);
printf("\tnum tracks %d\n", di->num_tracks);
bitmask_snprintf(di->mmc_cur, MMC_CAP_FLAGBITS, bits, sizeof(bits));
printf("\tcapabilities cur %s\n", bits);
bitmask_snprintf(di->mmc_cap, MMC_CAP_FLAGBITS, bits, sizeof(bits));
printf("\tcapabilities cap %s\n", bits);
}
#else
#define udf_dump_discinfo(a);
#endif
/* not called often */
int
udf_update_discinfo(struct udf_mount *ump)
{
struct vnode *devvp = ump->devvp;
struct partinfo dpart;
struct mmc_discinfo *di;
int error;
DPRINTF(VOLUMES, ("read/update disc info\n"));
di = &ump->discinfo;
memset(di, 0, sizeof(struct mmc_discinfo));
/* check if we're on a MMC capable device, i.e. CD/DVD */
error = VOP_IOCTL(devvp, MMCGETDISCINFO, di, FKIOCTL, NOCRED, NULL);
if (error == 0) {
udf_dump_discinfo(ump);
return 0;
};
/* disc partition support */
error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, NULL);
if (error)
return ENODEV;
/* set up a disc info profile for partitions */
di->mmc_profile = 0x01; /* disc type */
di->mmc_class = MMC_CLASS_DISC;
di->disc_state = MMC_STATE_CLOSED;
di->last_session_state = MMC_STATE_CLOSED;
di->bg_format_state = MMC_BGFSTATE_COMPLETED;
di->link_block_penalty = 0;
di->mmc_cur = MMC_CAP_RECORDABLE | MMC_CAP_REWRITABLE |
MMC_CAP_ZEROLINKBLK | MMC_CAP_HW_DEFECTFREE;
di->mmc_cap = di->mmc_cur;
di->disc_flags = MMC_DFLAGS_UNRESTRICTED;
/* TODO problem with last_possible_lba on resizable VND; request */
di->last_possible_lba = dpart.part->p_size;
di->sector_size = dpart.disklab->d_secsize;
di->blockingnr = 1;
di->num_sessions = 1;
di->num_tracks = 1;
di->first_track = 1;
di->first_track_last_session = di->last_track_last_session = 1;
udf_dump_discinfo(ump);
return 0;
}
/* --------------------------------------------------------------------- */
int
udf_update_trackinfo(struct udf_mount *ump, struct mmc_trackinfo *ti)
{
struct vnode *devvp = ump->devvp;
struct mmc_discinfo *di = &ump->discinfo;
int error, class;
DPRINTF(VOLUMES, ("read track info\n"));
class = di->mmc_class;
if (class != MMC_CLASS_DISC) {
/* tracknr specified in struct ti */
error = VOP_IOCTL(devvp, MMCGETTRACKINFO, ti, FKIOCTL,
NOCRED, NULL);
return error;
};
/* disc partition support */
if (ti->tracknr != 1)
return EIO;
/* create fake ti (TODO check for resized vnds) */
ti->sessionnr = 1;
ti->track_mode = 0; /* XXX */
ti->data_mode = 0; /* XXX */
ti->flags = MMC_TRACKINFO_LRA_VALID | MMC_TRACKINFO_NWA_VALID;
ti->track_start = 0;
ti->packet_size = 1;
/* TODO support for resizable vnd */
ti->track_size = di->last_possible_lba;
ti->next_writable = di->last_possible_lba;
ti->last_recorded = ti->next_writable;
ti->free_blocks = 0;
return 0;
}
/* --------------------------------------------------------------------- */
/* track/session searching for mounting */
static int
udf_search_tracks(struct udf_mount *ump, struct udf_args *args,
int *first_tracknr, int *last_tracknr)
{
struct mmc_trackinfo trackinfo;
uint32_t tracknr, start_track, num_tracks;
int error;
/* if negative, sessionnr is relative to last session */
if (args->sessionnr < 0) {
args->sessionnr += ump->discinfo.num_sessions;
/* sanity */
if (args->sessionnr < 0)
args->sessionnr = 0;
};
/* sanity */
if (args->sessionnr > ump->discinfo.num_sessions)
args->sessionnr = ump->discinfo.num_sessions;
/* search the tracks for this session, zero session nr indicates last */
if (args->sessionnr == 0) {
args->sessionnr = ump->discinfo.num_sessions;
if (ump->discinfo.last_session_state == MMC_STATE_EMPTY) {
args->sessionnr--;
}
};
/* search the first and last track of the specified session */
num_tracks = ump->discinfo.num_tracks;
start_track = ump->discinfo.first_track;
/* search for first track of this session */
for (tracknr = start_track; tracknr <= num_tracks; tracknr++) {
/* get track info */
trackinfo.tracknr = tracknr;
error = udf_update_trackinfo(ump, &trackinfo);
if (error)
return error;
if (trackinfo.sessionnr == args->sessionnr)
break;
}
*first_tracknr = tracknr;
/* search for last track of this session */
for (;tracknr <= num_tracks; tracknr++) {
/* get track info */
trackinfo.tracknr = tracknr;
error = udf_update_trackinfo(ump, &trackinfo);
if (error || (trackinfo.sessionnr != args->sessionnr)) {
tracknr--;
break;
};
};
if (tracknr > num_tracks)
tracknr--;
*last_tracknr = tracknr;
assert(*last_tracknr >= *first_tracknr);
return 0;
}
/* --------------------------------------------------------------------- */
static int
udf_read_anchor(struct udf_mount *ump, uint32_t sector, struct anchor_vdp **dst)
{
int error;
error = udf_read_descriptor(ump, sector, M_UDFVOLD,
(union dscrptr **) dst);
if (!error) {
/* blank terminator blocks are not allowed here */
if (*dst == NULL)
return ENOENT;
if (udf_rw16((*dst)->tag.id) != TAGID_ANCHOR) {
error = ENOENT;
free(*dst, M_UDFVOLD);
*dst = NULL;
DPRINTF(VOLUMES, ("Not an anchor\n"));
};
};
return error;
}
int
udf_read_anchors(struct udf_mount *ump, struct udf_args *args)
{
struct mmc_trackinfo first_track;
struct mmc_trackinfo last_track;
struct anchor_vdp **anchorsp;
uint32_t track_start;
uint32_t track_end;
uint32_t positions[4];
int first_tracknr, last_tracknr;
int error, anch, ok, first_anchor;
/* search the first and last track of the specified session */
error = udf_search_tracks(ump, args, &first_tracknr, &last_tracknr);
if (!error) {
first_track.tracknr = first_tracknr;
error = udf_update_trackinfo(ump, &first_track);
};
if (!error) {
last_track.tracknr = last_tracknr;
error = udf_update_trackinfo(ump, &last_track);
};
if (error) {
printf("UDF mount: reading disc geometry failed\n");
return 0;
};
track_start = first_track.track_start;
/* `end' is not as straitforward as start. */
track_end = last_track.track_start
+ last_track.track_size - last_track.free_blocks - 1;
if (ump->discinfo.mmc_cur & MMC_CAP_SEQUENTIAL) {
/* end of track is not straitforward here */
if (last_track.flags & MMC_TRACKINFO_LRA_VALID)
track_end = last_track.last_recorded;
else if (last_track.flags & MMC_TRACKINFO_NWA_VALID)
track_end = last_track.next_writable
- ump->discinfo.link_block_penalty;
};
/* VATs are only recorded on sequential media, but initialise */
ump->possible_vat_location = track_end;
/* its no use reading a blank track */
first_anchor = 0;
if (first_track.flags & MMC_TRACKINFO_BLANK)
first_anchor = 1;
/* read anchors start+256, start+512, end-256, end */
positions[0] = track_start+256;
positions[1] = track_end-256;
positions[2] = track_end;
positions[3] = track_start+512; /* [UDF 2.60/6.11.2] */
/* XXX shouldn't +512 be prefered above +256 for compat with Roxio CD */
ok = 0;
anchorsp = ump->anchors;
for (anch = first_anchor; anch < 4; anch++) {
DPRINTF(VOLUMES, ("Read anchor %d at sector %d\n", anch,
positions[anch]));
error = udf_read_anchor(ump, positions[anch], anchorsp);
if (!error) {
anchorsp++;
ok++;
};
};
return ok;
}
/* --------------------------------------------------------------------- */
/* we dont try to be smart; we just record the parts */
#define UDF_UPDATE_DSCR(name, dscr) \
if (name) \
free(name, M_UDFVOLD); \
name = dscr;
static int
udf_process_vds_descriptor(struct udf_mount *ump, union dscrptr *dscr)
{
uint16_t partnr;
DPRINTF(VOLUMES, ("\tprocessing VDS descr %d\n",
udf_rw16(dscr->tag.id)));
switch (udf_rw16(dscr->tag.id)) {
case TAGID_PRI_VOL : /* primary partition */
UDF_UPDATE_DSCR(ump->primary_vol, &dscr->pvd);
break;
case TAGID_LOGVOL : /* logical volume */
UDF_UPDATE_DSCR(ump->logical_vol, &dscr->lvd);
break;
case TAGID_UNALLOC_SPACE : /* unallocated space */
UDF_UPDATE_DSCR(ump->unallocated, &dscr->usd);
break;
case TAGID_IMP_VOL : /* implementation */
/* XXX do we care about multiple impl. descr ? */
UDF_UPDATE_DSCR(ump->implementation, &dscr->ivd);
break;
case TAGID_PARTITION : /* physical partition */
/* not much use if its not allocated */
if ((udf_rw16(dscr->pd.flags) & UDF_PART_FLAG_ALLOCATED) == 0) {
free(dscr, M_UDFVOLD);
break;
};
/* check partnr boundaries */
partnr = udf_rw16(dscr->pd.part_num);
if (partnr >= UDF_PARTITIONS)
return EINVAL;
UDF_UPDATE_DSCR(ump->partitions[partnr], &dscr->pd);
break;
case TAGID_VOL : /* volume space extender; rare */
DPRINTF(VOLUMES, ("VDS extender ignored\n"));
free(dscr, M_UDFVOLD);
break;
default :
DPRINTF(VOLUMES, ("Unhandled VDS type %d\n",
udf_rw16(dscr->tag.id)));
free(dscr, M_UDFVOLD);
};
return 0;
}
#undef UDF_UPDATE_DSCR
/* --------------------------------------------------------------------- */
static int
udf_read_vds_extent(struct udf_mount *ump, uint32_t loc, uint32_t len)
{
union dscrptr *dscr;
uint32_t sector_size, dscr_size;
int error;
sector_size = ump->discinfo.sector_size;
/* loc is sectornr, len is in bytes */
error = EIO;
while (len) {
error = udf_read_descriptor(ump, loc, M_UDFVOLD, &dscr);
if (error)
return error;
/* blank block is a terminator */
if (dscr == NULL)
return 0;
/* TERM descriptor is a terminator */
if (udf_rw16(dscr->tag.id) == TAGID_TERM)
return 0;
/* process all others */
dscr_size = udf_tagsize(dscr, sector_size);
error = udf_process_vds_descriptor(ump, dscr);
if (error) {
free(dscr, M_UDFVOLD);
break;
};
assert((dscr_size % sector_size) == 0);
len -= dscr_size;
loc += dscr_size / sector_size;
};
return error;
}
int
udf_read_vds_space(struct udf_mount *ump)
{
struct anchor_vdp *anchor, *anchor2;
size_t size;
uint32_t main_loc, main_len;
uint32_t reserve_loc, reserve_len;
int error;
/*
* read in VDS space provided by the anchors; if one descriptor read
* fails, try the mirror sector.
*
* check if 2nd anchor is different from 1st; if so, go for 2nd. This
* avoids the `compatibility features' of DirectCD that may confuse
* stuff completely.
*/
anchor = ump->anchors[0];
anchor2 = ump->anchors[1];
assert(anchor);
if (anchor2) {
size = sizeof(struct extent_ad);
if (memcmp(&anchor->main_vds_ex, &anchor2->main_vds_ex, size))
anchor = anchor2;
/* reserve is specified to be a literal copy of main */
};
main_loc = udf_rw32(anchor->main_vds_ex.loc);
main_len = udf_rw32(anchor->main_vds_ex.len);
reserve_loc = udf_rw32(anchor->reserve_vds_ex.loc);
reserve_len = udf_rw32(anchor->reserve_vds_ex.len);
error = udf_read_vds_extent(ump, main_loc, main_len);
if (error) {
printf("UDF mount: reading in reserve VDS extent\n");
error = udf_read_vds_extent(ump, reserve_loc, reserve_len);
};
return error;
}
/* --------------------------------------------------------------------- */
/*
* Read in the logical volume integrity sequence pointed to by our logical
* volume descriptor. Its a sequence that can be extended using fields in the
* integrity descriptor itself. On sequential media only one is found, on
* rewritable media a sequence of descriptors can be found as a form of
* history keeping and on non sequential write-once media the chain is vital
* to allow more and more descriptors to be written. The last descriptor
* written in an extent needs to claim space for a new extent.
*/
static int
udf_retrieve_lvint(struct udf_mount *ump, struct logvol_int_desc **lvintp)
{
union dscrptr *dscr;
struct logvol_int_desc *lvint;
uint32_t sector_size, sector, len;
int dscr_type, error;
sector_size = ump->discinfo.sector_size;
len = udf_rw32(ump->logical_vol->integrity_seq_loc.len);
sector = udf_rw32(ump->logical_vol->integrity_seq_loc.loc);
lvint = NULL;
dscr = NULL;
error = 0;
while (len) {
/* read in our integrity descriptor */
error = udf_read_descriptor(ump, sector, M_UDFVOLD, &dscr);
if (!error) {
if (dscr == NULL)
break; /* empty terminates */
dscr_type = udf_rw16(dscr->tag.id);
if (dscr_type == TAGID_TERM) {
break; /* clean terminator */
};
if (dscr_type != TAGID_LOGVOL_INTEGRITY) {
/* fatal... corrupt disc */
error = ENOENT;
break;
};
if (lvint)
free(lvint, M_UDFVOLD);
lvint = &dscr->lvid;
dscr = NULL;
}; /* else hope for the best... maybe the next is ok */
DPRINTFIF(VOLUMES, lvint, ("logvol integrity read, state %s\n",
udf_rw32(lvint->integrity_type) ? "CLOSED" : "OPEN"));
/* proceed sequential */
sector += 1;
len -= sector_size;
/* are we linking to a new piece? */
if (lvint->next_extent.len) {
len = udf_rw32(lvint->next_extent.len);
sector = udf_rw32(lvint->next_extent.loc);
};
};
/* clean up the mess, esp. when there is an error */
if (dscr)
free(dscr, M_UDFVOLD);
if (error && lvint) {
free(lvint, M_UDFVOLD);
lvint = NULL;
};
if (!lvint)
error = ENOENT;
*lvintp = lvint;
return error;
}
/* --------------------------------------------------------------------- */
/*
* Checks if ump's vds information is correct and complete
*/
int
udf_process_vds(struct udf_mount *ump, struct udf_args *args) {
union udf_pmap *mapping;
struct logvol_int_desc *lvint;
struct udf_logvol_info *lvinfo;
uint32_t n_pm, mt_l;
uint8_t *pmap_pos;
char *domain_name, *map_name;
const char *check_name;
int pmap_stype, pmap_size;
int pmap_type, log_part, phys_part;
int n_phys, n_virt, n_spar, n_meta;
int len, error;
if (ump == NULL)
return ENOENT;
/* we need at least an anchor (trivial, but for safety) */
if (ump->anchors[0] == NULL)
return EINVAL;
/* we need at least one primary and one logical volume descriptor */
if ((ump->primary_vol == NULL) || (ump->logical_vol) == NULL)
return EINVAL;
/* we need at least one partition descriptor */
if (ump->partitions[0] == NULL)
return EINVAL;
/* check logical volume sector size verses device sector size */
if (udf_rw32(ump->logical_vol->lb_size) != ump->discinfo.sector_size) {
printf("UDF mount: format violation, lb_size != sector size\n");
return EINVAL;
};
domain_name = ump->logical_vol->domain_id.id;
if (strncmp(domain_name, "*OSTA UDF Compliant", 20)) {
printf("mount_udf: disc not OSTA UDF Compliant, aborting\n");
return EINVAL;
};
/* retrieve logical volume integrity sequence */
error = udf_retrieve_lvint(ump, &ump->logvol_integrity);
/*
* We need at least one logvol integrity descriptor recorded. Note
* that its OK to have an open logical volume integrity here. The VAT
* will close/update the integrity.
*/
if (ump->logvol_integrity == NULL)
return EINVAL;
/* process derived structures */
n_pm = udf_rw32(ump->logical_vol->n_pm); /* num partmaps */
lvint = ump->logvol_integrity;
lvinfo = (struct udf_logvol_info *) (&lvint->tables[2 * n_pm]);
ump->logvol_info = lvinfo;
/* TODO check udf versions? */
/*
* check logvol mappings: effective virt->log partmap translation
* check and recording of the mapping results. Saves expensive
* strncmp() in tight places.
*/
DPRINTF(VOLUMES, ("checking logvol mappings\n"));
n_pm = udf_rw32(ump->logical_vol->n_pm); /* num partmaps */
mt_l = udf_rw32(ump->logical_vol->mt_l); /* partmaps data length */
pmap_pos = ump->logical_vol->maps;
if (n_pm > UDF_PMAPS) {
printf("UDF mount: too many mappings\n");
return EINVAL;
};
n_phys = n_virt = n_spar = n_meta = 0;
for (log_part = 0; log_part < n_pm; log_part++) {
mapping = (union udf_pmap *) pmap_pos;
pmap_stype = pmap_pos[0];
pmap_size = pmap_pos[1];
switch (pmap_stype) {
case 1: /* physical mapping */
/* volseq = udf_rw16(mapping->pm1.vol_seq_num); */
phys_part = udf_rw16(mapping->pm1.part_num);
pmap_type = UDF_VTOP_TYPE_PHYS;
n_phys++;
break;
case 2: /* virtual/sparable/meta mapping */
map_name = mapping->pm2.part_id.id;
/* volseq = udf_rw16(mapping->pm2.vol_seq_num); */
phys_part = udf_rw16(mapping->pm2.part_num);
pmap_type = UDF_VTOP_TYPE_UNKNOWN;
len = UDF_REGID_ID_SIZE;
check_name = "*UDF Virtual Partition";
if (strncmp(map_name, check_name, len) == 0) {
pmap_type = UDF_VTOP_TYPE_VIRT;
n_virt++;
break;
};
check_name = "*UDF Sparable Partition";
if (strncmp(map_name, check_name, len) == 0) {
pmap_type = UDF_VTOP_TYPE_SPARABLE;
n_spar++;
break;
};
check_name = "*UDF Metadata Partition";
if (strncmp(map_name, check_name, len) == 0) {
pmap_type = UDF_VTOP_TYPE_META;
n_meta++;
break;
};
break;
default:
return EINVAL;
};
DPRINTF(VOLUMES, ("\t%d -> %d type %d\n", log_part, phys_part,
pmap_type));
if (pmap_type == UDF_VTOP_TYPE_UNKNOWN)
return EINVAL;
ump->vtop [log_part] = phys_part;
ump->vtop_tp[log_part] = pmap_type;
pmap_pos += pmap_size;
};
/* not winning the beauty contest */
ump->vtop_tp[UDF_VTOP_RAWPART] = UDF_VTOP_TYPE_RAW;
/* test some basic UDF assertions/requirements */
if ((n_virt > 1) || (n_spar > 1) || (n_meta > 1))
return EINVAL;
if (n_virt) {
if ((n_phys == 0) || n_spar || n_meta)
return EINVAL;
};
if (n_spar + n_phys == 0)
return EINVAL;
/* vat's can only be on a sequential media */
ump->data_alloc = UDF_ALLOC_SPACEMAP;
if (n_virt)
ump->data_alloc = UDF_ALLOC_SEQUENTIAL;
ump->meta_alloc = UDF_ALLOC_SPACEMAP;
if (n_virt)
ump->meta_alloc = UDF_ALLOC_VAT;
if (n_meta)
ump->meta_alloc = UDF_ALLOC_METABITMAP;
/* special cases for pseudo-overwrite */
if (ump->discinfo.mmc_cur & MMC_CAP_PSEUDOOVERWRITE) {
ump->data_alloc = UDF_ALLOC_SEQUENTIAL;
if (n_meta) {
ump->meta_alloc = UDF_ALLOC_METASEQUENTIAL;
} else {
ump->meta_alloc = UDF_ALLOC_RELAXEDSEQUENTIAL;
};
};
DPRINTF(VOLUMES, ("\tdata alloc scheme %d, meta alloc scheme %d\n",
ump->data_alloc, ump->meta_alloc));
/* TODO determine partitions to write data and metadata ? */
/* signal its OK for now */
return 0;
}
/* --------------------------------------------------------------------- */
/*
* Read in complete VAT file and check if its indeed a VAT file descriptor
*/
static int
udf_check_for_vat(struct udf_node *vat_node)
{
struct udf_mount *ump;
struct icb_tag *icbtag;
struct timestamp *mtime;
struct regid *regid;
struct udf_vat *vat;
struct udf_logvol_info *lvinfo;
uint32_t vat_length, alloc_length;
uint32_t vat_offset, vat_entries;
uint32_t sector_size;
uint32_t sectors;
uint32_t *raw_vat;
char *regid_name;
int filetype;
int error;
/* vat_length is really 64 bits though impossible */
DPRINTF(VOLUMES, ("Checking for VAT\n"));
if (!vat_node)
return ENOENT;
/* get mount info */
ump = vat_node->ump;
/* check assertions */
assert(vat_node->fe || vat_node->efe);
assert(ump->logvol_integrity);
/* get information from fe/efe */
if (vat_node->fe) {
vat_length = udf_rw64(vat_node->fe->inf_len);
icbtag = &vat_node->fe->icbtag;
mtime = &vat_node->fe->mtime;
} else {
vat_length = udf_rw64(vat_node->efe->inf_len);
icbtag = &vat_node->efe->icbtag;
mtime = &vat_node->efe->mtime;
};
/* Check icb filetype! it has to be 0 or UDF_ICB_FILETYPE_VAT */
filetype = icbtag->file_type;
if ((filetype != 0) && (filetype != UDF_ICB_FILETYPE_VAT))
return ENOENT;
DPRINTF(VOLUMES, ("\tPossible VAT length %d\n", vat_length));
/* place a sanity check on the length; currently 1Mb in size */
if (vat_length > 1*1024*1024)
return ENOENT;
/* get sector size */
sector_size = vat_node->ump->discinfo.sector_size;
/* calculate how many sectors to read in and how much to allocate */
sectors = (vat_length + sector_size -1) / sector_size;
alloc_length = (sectors + 2) * sector_size;
/* try to allocate the space */
ump->vat_table_alloc_length = alloc_length;
ump->vat_table = malloc(alloc_length, M_UDFMNT, M_CANFAIL | M_WAITOK);
if (!ump->vat_table)
return ENOMEM; /* impossible to allocate */
DPRINTF(VOLUMES, ("\talloced fine\n"));
/* read it in! */
raw_vat = (uint32_t *) ump->vat_table;
error = udf_read_file_extent(vat_node, 0, sectors, (uint8_t *) raw_vat);
if (error) {
DPRINTF(VOLUMES, ("\tread failed : %d\n", error));
/* not completely readable... :( bomb out */
free(ump->vat_table, M_UDFMNT);
ump->vat_table = NULL;
return error;
};
DPRINTF(VOLUMES, ("VAT read in fine!\n"));
/*
* check contents of the file if its the old 1.50 VAT table format.
* Its notoriously broken and allthough some implementations support an
* extention as defined in the UDF 1.50 errata document, its doubtfull
* to be useable since a lot of implementations don't maintain it.
*/
lvinfo = ump->logvol_info;
if (filetype == 0) {
/* definition */
vat_offset = 0;
vat_entries = (vat_length-36)/4;
/* check 1.50 VAT */
regid = (struct regid *) (raw_vat + vat_entries);
regid_name = (char *) regid->id;
error = strncmp(regid_name, "*UDF Virtual Alloc Tbl", 22);
if (error) {
DPRINTF(VOLUMES, ("VAT format 1.50 rejected\n"));
free(ump->vat_table, M_UDFMNT);
ump->vat_table = NULL;
return ENOENT;
};
/* TODO update LVID from "*UDF VAT LVExtension" ext. attr. */
} else {
vat = (struct udf_vat *) raw_vat;
/* definition */
vat_offset = vat->header_len;
vat_entries = (vat_length - vat_offset)/4;
assert(lvinfo);
lvinfo->num_files = vat->num_files;
lvinfo->num_directories = vat->num_directories;
lvinfo->min_udf_readver = vat->min_udf_readver;
lvinfo->min_udf_writever = vat->min_udf_writever;
lvinfo->max_udf_writever = vat->max_udf_writever;
};
ump->vat_offset = vat_offset;
ump->vat_entries = vat_entries;
DPRINTF(VOLUMES, ("VAT format accepted, marking it closed\n"));
ump->logvol_integrity->integrity_type = udf_rw32(UDF_INTEGRITY_CLOSED);
ump->logvol_integrity->time = *mtime;
return 0; /* success! */
}
/* --------------------------------------------------------------------- */
static int
udf_search_vat(struct udf_mount *ump, union udf_pmap *mapping)
{
struct udf_node *vat_node;
struct long_ad icb_loc;
uint32_t early_vat_loc, late_vat_loc, vat_loc;
int error;
/* mapping info not needed */
mapping = mapping;
vat_loc = ump->possible_vat_location;
early_vat_loc = vat_loc - 20;
late_vat_loc = vat_loc + 1024;
/* TODO first search last sector? */
do {
DPRINTF(VOLUMES, ("Checking for VAT at sector %d\n", vat_loc));
icb_loc.loc.part_num = udf_rw16(UDF_VTOP_RAWPART);
icb_loc.loc.lb_num = udf_rw32(vat_loc);
error = udf_get_node(ump, &icb_loc, &vat_node);
if (!error) error = udf_check_for_vat(vat_node);
if (!error) break;
if (vat_node) {
vput(vat_node->vnode);
udf_dispose_node(vat_node);
};
vat_loc--; /* walk backwards */
} while (vat_loc >= early_vat_loc);
/* we don't need our VAT node anymore */
if (vat_node) {
vput(vat_node->vnode);
udf_dispose_node(vat_node);
};
return error;
}
/* --------------------------------------------------------------------- */
static int
udf_read_sparables(struct udf_mount *ump, union udf_pmap *mapping)
{
union dscrptr *dscr;
struct part_map_spare *pms = (struct part_map_spare *) mapping;
uint32_t lb_num;
int spar, error;
/*
* The partition mapping passed on to us specifies the information we
* need to locate and initialise the sparable partition mapping
* information we need.
*/
DPRINTF(VOLUMES, ("Read sparable table\n"));
ump->sparable_packet_len = udf_rw16(pms->packet_len);
for (spar = 0; spar < pms->n_st; spar++) {
lb_num = pms->st_loc[spar];
DPRINTF(VOLUMES, ("Checking for sparing table %d\n", lb_num));
error = udf_read_descriptor(ump, lb_num, M_UDFVOLD, &dscr);
if (!error && dscr) {
if (udf_rw16(dscr->tag.id) == TAGID_SPARING_TABLE) {
if (ump->sparing_table)
free(ump->sparing_table, M_UDFVOLD);
ump->sparing_table = &dscr->spt;
dscr = NULL;
DPRINTF(VOLUMES,
("Sparing table accepted (%d entries)\n",
udf_rw16(ump->sparing_table->rt_l)));
break; /* we're done */
};
};
if (dscr)
free(dscr, M_UDFVOLD);
};
if (ump->sparing_table)
return 0;
return ENOENT;
}
/* --------------------------------------------------------------------- */
int
udf_read_vds_tables(struct udf_mount *ump, struct udf_args *args)
{
union udf_pmap *mapping;
uint32_t n_pm, mt_l;
uint32_t log_part;
uint8_t *pmap_pos;
int pmap_size;
int error;
/* We have to iterate again over the part mappings for locations */
n_pm = udf_rw32(ump->logical_vol->n_pm); /* num partmaps */
mt_l = udf_rw32(ump->logical_vol->mt_l); /* partmaps data length */
pmap_pos = ump->logical_vol->maps;
for (log_part = 0; log_part < n_pm; log_part++) {
mapping = (union udf_pmap *) pmap_pos;
switch (ump->vtop_tp[log_part]) {
case UDF_VTOP_TYPE_PHYS :
/* nothing */
break;
case UDF_VTOP_TYPE_VIRT :
/* search and load VAT */
error = udf_search_vat(ump, mapping);
if (error)
return ENOENT;
break;
case UDF_VTOP_TYPE_SPARABLE :
/* load one of the sparable tables */
error = udf_read_sparables(ump, mapping);
break;
case UDF_VTOP_TYPE_META :
/* TODO load metafile and metabitmapfile FE/EFEs */
break;
default:
break;
};
pmap_size = pmap_pos[1];
pmap_pos += pmap_size;
};
return 0;
}
/* --------------------------------------------------------------------- */
int
udf_read_rootdirs(struct udf_mount *ump, struct udf_args *args)
{
struct udf_node *rootdir_node, *streamdir_node;
union dscrptr *dscr;
struct long_ad fsd_loc, *dir_loc;
uint32_t lb_num, dummy;
uint32_t fsd_len;
int dscr_type;
int error;
/* TODO implement FSD reading in seperate function like integrity? */
/* get fileset descriptor sequence */
fsd_loc = ump->logical_vol->lv_fsd_loc;
fsd_len = udf_rw32(fsd_loc.len);
dscr = NULL;
error = 0;
while (fsd_len || error) {
DPRINTF(VOLUMES, ("fsd_len = %d\n", fsd_len));
/* translate fsd_loc to lb_num */
error = udf_translate_vtop(ump, &fsd_loc, &lb_num, &dummy);
if (error)
break;
DPRINTF(VOLUMES, ("Reading FSD at lb %d\n", lb_num));
error = udf_read_descriptor(ump, lb_num, M_UDFVOLD, &dscr);
/* end markers */
if (error || (dscr == NULL))
break;
/* analyse */
dscr_type = udf_rw16(dscr->tag.id);
if (dscr_type == TAGID_TERM)
break;
if (dscr_type != TAGID_FSD) {
free(dscr, M_UDFVOLD);
return ENOENT;
};
/*
* TODO check for multiple fileset descriptors; its only
* picking the last now. Also check for FSD
* correctness/interpretability
*/
/* update */
if (ump->fileset_desc) {
free(ump->fileset_desc, M_UDFVOLD);
};
ump->fileset_desc = &dscr->fsd;
dscr = NULL;
/* continue to the next fsd */
fsd_len -= ump->discinfo.sector_size;
fsd_loc.loc.lb_num = udf_rw32(udf_rw32(fsd_loc.loc.lb_num)+1);
/* follow up to fsd->next_ex (long_ad) if its not null */
if (udf_rw32(ump->fileset_desc->next_ex.len)) {
DPRINTF(VOLUMES, ("follow up FSD extent\n"));
fsd_loc = ump->fileset_desc->next_ex;
fsd_len = udf_rw32(ump->fileset_desc->next_ex.len);
};
};
if (dscr)
free(dscr, M_UDFVOLD);
/* there has to be one */
if (ump->fileset_desc == NULL)
return ENOENT;
DPRINTF(VOLUMES, ("FSD read in fine\n"));
/*
* Now the FSD is known, read in the rootdirectory and if one exists,
* the system stream dir. Some files in the system streamdir are not
* wanted in this implementation since they are not maintained. If
* writing is enabled we'll delete these files if they exist.
*/
rootdir_node = streamdir_node = NULL;
dir_loc = NULL;
/* try to read in the rootdir */
dir_loc = &ump->fileset_desc->rootdir_icb;
error = udf_get_node(ump, dir_loc, &rootdir_node);
if (error)
return ENOENT;
/* aparently it read in fine */
/*
* Try the system stream directory; not very likely in the ones we
* test, but for completeness.
*/
dir_loc = &ump->fileset_desc->streamdir_icb;
if (udf_rw32(dir_loc->len)) {
error = udf_get_node(ump, dir_loc, &streamdir_node);
if (error)
printf("udf mount: streamdir defined but ignored\n");
if (!error) {
/*
* TODO process streamdir `baddies' i.e. files we dont
* want if R/W
*/
};
};
DPRINTF(VOLUMES, ("Rootdir(s) read in fine\n"));
/* release the vnodes again; they'll be auto-recycled later */
if (streamdir_node) {
vput(streamdir_node->vnode);
};
if (rootdir_node) {
vput(rootdir_node->vnode);
};
return 0;
}
/* --------------------------------------------------------------------- */
int
udf_translate_vtop(struct udf_mount *ump, struct long_ad *icb_loc,
uint32_t *lb_numres, uint32_t *extres)
{
struct part_desc *pdesc;
struct spare_map_entry *sme;
uint32_t *trans;
uint32_t lb_num, lb_rel, lb_packet;
int rel, vpart, part;
assert(ump && icb_loc && lb_numres);
vpart = udf_rw16(icb_loc->loc.part_num);
lb_num = udf_rw32(icb_loc->loc.lb_num);
if (vpart < 0 || vpart > UDF_VTOP_RAWPART)
return EINVAL;
switch (ump->vtop_tp[vpart]) {
case UDF_VTOP_TYPE_RAW :
/* 1:1 to the end of the device */
*lb_numres = lb_num;
*extres = INT_MAX;
return 0;
case UDF_VTOP_TYPE_PHYS :
/* transform into its disc logical block */
part = ump->vtop[vpart];
pdesc = ump->partitions[part];
if (lb_num > udf_rw32(pdesc->part_len))
return EINVAL;
*lb_numres = lb_num + udf_rw32(pdesc->start_loc);
/* extent from here to the end of the partition */
*extres = udf_rw32(pdesc->part_len) - lb_num;
return 0;
case UDF_VTOP_TYPE_VIRT :
/* only maps one sector, lookup in VAT */
if (lb_num >= ump->vat_entries) /* XXX > or >= ? */
return EINVAL;
/* lookup in virtual allocation table */
trans = (uint32_t *) (ump->vat_table + ump->vat_offset);
lb_num = udf_rw32(trans[lb_num]);
/* transform into its disc logical block */
part = ump->vtop[vpart];
pdesc = ump->partitions[part];
if (lb_num > udf_rw32(pdesc->part_len))
return EINVAL;
*lb_numres = lb_num + udf_rw32(pdesc->start_loc);
/* just one logical block */
*extres = 1;
return 0;
case UDF_VTOP_TYPE_SPARABLE :
/* check if the packet containing the lb_num is remapped */
lb_packet = lb_num / ump->sparable_packet_len;
lb_rel = lb_num % ump->sparable_packet_len;
for (rel = 0; rel < udf_rw16(ump->sparing_table->rt_l); rel++) {
sme = &ump->sparing_table->entries[rel];
if (lb_packet == udf_rw32(sme->org)) {
/* NOTE maps to absolute disc logical block! */
*lb_numres = udf_rw32(sme->map) + lb_rel;
*extres = ump->sparable_packet_len - lb_rel;
return 0;
};
};
/* transform into its disc logical block */
part = ump->vtop[vpart];
pdesc = ump->partitions[part];
if (lb_num > udf_rw32(pdesc->part_len))
return EINVAL;
*lb_numres = lb_num + udf_rw32(pdesc->start_loc);
/* rest of block */
*extres = ump->sparable_packet_len - lb_rel;
return 0;
case UDF_VTOP_TYPE_META :
default:
printf("UDF vtop translation scheme %d unimplemented yet\n",
ump->vtop_tp[vpart]);
};
return EINVAL;
}
/* --------------------------------------------------------------------- */
/* To make absolutely sure we are NOT returning zero, add one :) */
long
udf_calchash(struct long_ad *icbptr)
{
/* ought to be enough since each mountpoint has its own chain */
return udf_rw32(icbptr->loc.lb_num) + 1;
}
/* --------------------------------------------------------------------- */
static struct udf_node *
udf_hashget(struct udf_mount *ump, struct long_ad *icbptr)
{
struct udf_node *unp;
struct vnode *vp;
uint32_t hashline;
loop:
simple_lock(&ump->ihash_slock);
hashline = udf_calchash(icbptr) & UDF_INODE_HASHMASK;
LIST_FOREACH(unp, &ump->udf_nodes[hashline], hashchain) {
assert(unp);
if (unp->loc.loc.lb_num == icbptr->loc.lb_num &&
unp->loc.loc.part_num == icbptr->loc.part_num) {
vp = unp->vnode;
assert(vp);
simple_lock(&vp->v_interlock);
simple_unlock(&ump->ihash_slock);
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK))
goto loop;
return unp;
};
};
simple_unlock(&ump->ihash_slock);
return NULL;
};
/* --------------------------------------------------------------------- */
static void
udf_hashins(struct udf_node *unp)
{
struct udf_mount *ump;
uint32_t hashline;
ump = unp->ump;
simple_lock(&ump->ihash_slock);
hashline = udf_calchash(&unp->loc) & UDF_INODE_HASHMASK;
LIST_INSERT_HEAD(&ump->udf_nodes[hashline], unp, hashchain);
simple_unlock(&ump->ihash_slock);
}
/* --------------------------------------------------------------------- */
static void
udf_hashrem(struct udf_node *unp)
{
struct udf_mount *ump;
ump = unp->ump;
simple_lock(&ump->ihash_slock);
LIST_REMOVE(unp, hashchain);
simple_unlock(&ump->ihash_slock);
}
/* --------------------------------------------------------------------- */
int
udf_dispose_locked_node(struct udf_node *node)
{
if (!node)
return 0;
if (node->vnode)
VOP_UNLOCK(node->vnode, 0);
return udf_dispose_node(node);
}
/* --------------------------------------------------------------------- */
int
udf_dispose_node(struct udf_node *node)
{
struct vnode *vp;
DPRINTF(NODE, ("udf_dispose_node called on node %p\n", node));
if (!node) {
DPRINTF(NODE, ("UDF: Dispose node on node NULL, ignoring\n"));
return 0;
};
vp = node->vnode;
/* TODO extended attributes and streamdir */
/* remove from our hash lookup table */
udf_hashrem(node);
/* dissociate our udf_node from the vnode */
vp->v_data = NULL;
/* free associated memory and the node itself */
if (node->fe)
pool_put(&node->ump->desc_pool, node->fe);
if (node->efe)
pool_put(&node->ump->desc_pool, node->efe);
pool_put(&udf_node_pool, node);
return 0;
}
/* --------------------------------------------------------------------- */
/*
* Genfs interfacing
*
* static const struct genfs_ops udffs_genfsops = {
* .gop_size = genfs_size,
* size of transfers
* .gop_alloc = udf_gop_alloc,
* unknown
* .gop_write = genfs_gop_write,
* putpages interface code
* .gop_markupdate = udf_gop_markupdate,
* set update/modify flags etc.
* };
*/
/*
* Genfs interface. These four functions are the only ones defined though not
* documented... great.... why is chosen for the `.' initialisers i dont know
* but other filingsystems seem to use it this way.
*/
static int
udf_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
struct ucred *cred)
{
return 0;
}
static void
udf_gop_markupdate(struct vnode *vp, int flags)
{
struct udf_node *udf_node = VTOI(vp);
u_long mask;
udf_node = udf_node; /* shut up gcc */
mask = 0;
#ifdef notyet
if ((flags & GOP_UPDATE_ACCESSED) != 0) {
mask = UDF_SET_ACCESS;
}
if ((flags & GOP_UPDATE_MODIFIED) != 0) {
mask |= UDF_SET_UPDATE;
}
if (mask) {
udf_node->update_flag |= mask;
}
#endif
/* msdosfs doesn't do it, but shouldn't we update the times here? */
}
static const struct genfs_ops udf_genfsops = {
.gop_size = genfs_size,
.gop_alloc = udf_gop_alloc,
.gop_write = genfs_gop_write,
.gop_markupdate = udf_gop_markupdate,
};
/* --------------------------------------------------------------------- */
/*
* Each node can have an attached streamdir node though not
* recursively. These are otherwise known as named substreams/named
* extended attributes that have no size limitations.
*
* `Normal' extended attributes are indicated with a number and are recorded
* in either the fe/efe descriptor itself for small descriptors or recorded in
* the attached extended attribute file. Since this file can get fragmented,
* care ought to be taken.
*/
int
udf_get_node(struct udf_mount *ump, struct long_ad *node_icb_loc,
struct udf_node **noderes)
{
union dscrptr *dscr, *tmpdscr;
struct udf_node *node;
struct vnode *nvp;
struct long_ad icb_loc;
extern int (**udf_vnodeop_p)(void *);
uint64_t file_size;
uint32_t lb_size, sector, dummy;
int udf_file_type, dscr_type, strat, strat4096, needs_indirect;
int error;
DPRINTF(NODE, ("udf_get_node called\n"));
*noderes = node = NULL;
/* lock to disallow simultanious creation of same node */
lockmgr(&ump->get_node_lock, LK_EXCLUSIVE, NULL);
DPRINTF(NODE, ("\tlookup in hash table\n"));
/* lookup in hash table */
assert(ump);
assert(node_icb_loc);
node = udf_hashget(ump, node_icb_loc);
if (node) {
DPRINTF(NODE, ("\tgot it from the hash!\n"));
/* vnode is returned locked */
*noderes = node;
lockmgr(&ump->get_node_lock, LK_RELEASE, NULL);
return 0;
};
/* garbage check: translate node_icb_loc to sectornr */
error = udf_translate_vtop(ump, node_icb_loc, &sector, &dummy);
if (error) {
/* no use, this will fail anyway */
lockmgr(&ump->get_node_lock, LK_RELEASE, NULL);
return EINVAL;
};
/* build node (do initialise!) */
node = pool_get(&udf_node_pool, PR_WAITOK);
memset(node, 0, sizeof(struct udf_node));
DPRINTF(NODE, ("\tget new vnode\n"));
/* give it a vnode */
error = getnewvnode(VT_UDF, ump->vfs_mountp, udf_vnodeop_p, &nvp);
if (error) {
pool_put(&udf_node_pool, node);
lockmgr(&ump->get_node_lock, LK_RELEASE, NULL);
return error;
};
/* allways return locked vnode */
if ((error = vn_lock(nvp, LK_EXCLUSIVE | LK_RETRY))) {
/* recycle vnode and unlock; simultanious will fail too */
ungetnewvnode(nvp);
lockmgr(&ump->get_node_lock, LK_RELEASE, NULL);
return error;
};
/* initialise crosslinks, note location of fe/efe for hashing */
node->ump = ump;
node->vnode = nvp;
nvp->v_data = node;
node->loc = *node_icb_loc;
node->lockf = 0;
/* insert into the hash lookup */
udf_hashins(node);
/* safe to unlock, the entry is in the hash table, vnode is locked */
lockmgr(&ump->get_node_lock, LK_RELEASE, NULL);
icb_loc = *node_icb_loc;
needs_indirect = 0;
strat4096 = 0;
udf_file_type = UDF_ICB_FILETYPE_UNKNOWN;
file_size = 0;
lb_size = udf_rw32(ump->logical_vol->lb_size);
do {
error = udf_translate_vtop(ump, &icb_loc, &sector, &dummy);
if (error)
break;
/* try to read in fe/efe */
error = udf_read_descriptor(ump, sector, M_UDFTEMP, &tmpdscr);
/* blank sector marks end of sequence, check this */
if ((tmpdscr == NULL) && (!strat4096))
error = ENOENT;
/* break if read error or blank sector */
if (error || (tmpdscr == NULL))
break;
/* process descriptor based on the descriptor type */
dscr_type = udf_rw16(tmpdscr->tag.id);
/* if dealing with an indirect entry, follow the link */
if (dscr_type == TAGID_INDIRECT_ENTRY) {
needs_indirect = 0;
icb_loc = tmpdscr->inde.indirect_icb;
free(tmpdscr, M_UDFTEMP);
continue;
};
/* only file entries and extended file entries allowed here */
if ((dscr_type != TAGID_FENTRY) &&
(dscr_type != TAGID_EXTFENTRY)) {
free(tmpdscr, M_UDFTEMP);
error = ENOENT;
break;
};
/* get descriptor space from our pool */
KASSERT(udf_tagsize(tmpdscr, lb_size) == lb_size);
dscr = pool_get(&ump->desc_pool, PR_WAITOK);
memcpy(dscr, tmpdscr, lb_size);
free(tmpdscr, M_UDFTEMP);
/* record and process/update (ext)fentry */
if (dscr_type == TAGID_FENTRY) {
if (node->fe)
pool_put(&ump->desc_pool, node->fe);
node->fe = &dscr->fe;
strat = udf_rw16(node->fe->icbtag.strat_type);
udf_file_type = node->fe->icbtag.file_type;
file_size = udf_rw64(node->fe->inf_len);
} else {
if (node->efe)
pool_put(&ump->desc_pool, node->efe);
node->efe = &dscr->efe;
strat = udf_rw16(node->efe->icbtag.strat_type);
udf_file_type = node->efe->icbtag.file_type;
file_size = udf_rw64(node->efe->inf_len);
};
/* check recording strategy (structure) */
/*
* Strategy 4096 is a daisy linked chain terminating with an
* unrecorded sector or a TERM descriptor. The next
* descriptor is to be found in the sector that follows the
* current sector.
*/
if (strat == 4096) {
strat4096 = 1;
needs_indirect = 1;
icb_loc.loc.lb_num = udf_rw32(icb_loc.loc.lb_num) + 1;
};
/*
* Strategy 4 is the normal strategy and terminates, but if
* we're in strategy 4096, we can't have strategy 4 mixed in
*/
if (strat == 4) {
if (strat4096) {
error = EINVAL;
break;
};
break; /* done */
};
} while (!error);
if (error) {
/* recycle udf_node */
udf_dispose_node(node);
/* recycle vnode */
nvp->v_data = NULL;
ungetnewvnode(nvp);
return EINVAL; /* error code ok? */
};
/* post process and initialise node */
/* assert no references to dscr anymore beyong this point */
assert((node->fe) || (node->efe));
dscr = NULL;
/*
* Record where to record an updated version of the descriptor. If
* there is a sequence of indirect entries, icb_loc will have been
* updated. Its the write disipline to allocate new space and to make
* sure the chain is maintained.
*
* `needs_indirect' flags if the next location is to be filled with
* with an indirect entry.
*/
node->next_loc = icb_loc;
node->needs_indirect = needs_indirect;
/*
* Translate UDF filetypes into vnode types.
*
* Systemfiles like the meta main and mirror files are not treated as
* normal files, so we type them as having no type. UDF dictates that
* they are not allowed to be visible.
*/
/* TODO specfs, fifofs etc etc. vnops setting */
switch (udf_file_type) {
case UDF_ICB_FILETYPE_DIRECTORY :
case UDF_ICB_FILETYPE_STREAMDIR :
nvp->v_type = VDIR;
break;
case UDF_ICB_FILETYPE_BLOCKDEVICE :
nvp->v_type = VBLK;
break;
case UDF_ICB_FILETYPE_CHARDEVICE :
nvp->v_type = VCHR;
break;
case UDF_ICB_FILETYPE_SYMLINK :
nvp->v_type = VLNK;
break;
case UDF_ICB_FILETYPE_META_MAIN :
case UDF_ICB_FILETYPE_META_MIRROR :
nvp->v_type = VNON;
break;
case UDF_ICB_FILETYPE_RANDOMACCESS :
nvp->v_type = VREG;
break;
default:
/* YIKES, either a block/char device, fifo or something else */
nvp->v_type = VNON;
};
/* initialise genfs */
genfs_node_init(nvp, &udf_genfsops);
/* don't forget to set vnode's v_size */
nvp->v_size = file_size;
/* TODO ext attr and streamdir nodes */
*noderes = node;
return 0;
}
/* --------------------------------------------------------------------- */
/* UDF<->unix converters */
/* --------------------------------------------------------------------- */
static mode_t
udf_perm_to_unix_mode(uint32_t perm)
{
mode_t mode;
mode = ((perm & UDF_FENTRY_PERM_USER_MASK) );
mode |= ((perm & UDF_FENTRY_PERM_GRP_MASK ) >> 2);
mode |= ((perm & UDF_FENTRY_PERM_OWNER_MASK) >> 4);
return mode;
}
/* --------------------------------------------------------------------- */
#ifdef notyet
static uint32_t
unix_mode_to_udf_perm(mode_t mode)
{
uint32_t perm;
perm = ((mode & S_IRWXO) );
perm |= ((mode & S_IRWXG) << 2);
perm |= ((mode & S_IRWXU) << 4);
perm |= ((mode & S_IWOTH) << 3);
perm |= ((mode & S_IWGRP) << 5);
perm |= ((mode & S_IWUSR) << 7);
return perm;
}
#endif
/* --------------------------------------------------------------------- */
static uint32_t
udf_icb_to_unix_filetype(uint32_t icbftype)
{
switch (icbftype) {
case UDF_ICB_FILETYPE_DIRECTORY :
case UDF_ICB_FILETYPE_STREAMDIR :
return S_IFDIR;
case UDF_ICB_FILETYPE_FIFO :
return S_IFIFO;
case UDF_ICB_FILETYPE_CHARDEVICE :
return S_IFCHR;
case UDF_ICB_FILETYPE_BLOCKDEVICE :
return S_IFBLK;
case UDF_ICB_FILETYPE_RANDOMACCESS :
return S_IFREG;
case UDF_ICB_FILETYPE_SYMLINK :
return S_IFLNK;
case UDF_ICB_FILETYPE_SOCKET :
return S_IFSOCK;
};
/* no idea what this is */
return 0;
}
/* --------------------------------------------------------------------- */
/* TODO KNF-ify */
void
udf_to_unix_name(char *result, char *id, int len, struct charspec *chsp)
{
uint16_t raw_name[1024], unix_name[1024];
uint16_t *inchp, ch;
uint8_t *outchp;
int ucode_chars, nice_uchars;
assert(sizeof(char) == sizeof(uint8_t));
outchp = (uint8_t *) result;
if ((chsp->type == 0) && (strcmp((char*) chsp->inf, "OSTA Compressed Unicode") == 0)) {
*raw_name = *unix_name = 0;
ucode_chars = udf_UncompressUnicode(len, (uint8_t *) id, raw_name);
ucode_chars = MIN(ucode_chars, UnicodeLength((unicode_t *) raw_name));
nice_uchars = UDFTransName(unix_name, raw_name, ucode_chars);
for (inchp = unix_name; nice_uchars>0; inchp++, nice_uchars--) {
ch = *inchp;
/* XXX sloppy unicode -> latin */
*outchp++ = ch & 255;
if (!ch) break;
};
*outchp++ = 0;
} else {
/* assume 8bit char length byte latin-1 */
assert(*id == 8);
strncpy((char *) result, (char *) (id+1), strlen((char *) (id+1)));
};
}
/* --------------------------------------------------------------------- */
/* TODO KNF-ify */
void
unix_to_udf_name(char *result, char *name,
uint8_t *result_len, struct charspec *chsp)
{
uint16_t raw_name[1024];
int udf_chars, name_len;
char *inchp;
uint16_t *outchp;
/* convert latin-1 or whatever to unicode-16 */
*raw_name = 0;
name_len = 0;
inchp = name;
outchp = raw_name;
while (*inchp) {
*outchp++ = (uint16_t) (*inchp++);
name_len++;
};
if ((chsp->type == 0) && (strcmp((char *) chsp->inf, "OSTA Compressed Unicode") == 0)) {
udf_chars = udf_CompressUnicode(name_len, 8, (unicode_t *) raw_name, (byte *) result);
} else {
/* XXX assume 8bit char length byte latin-1 */
*result++ = 8; udf_chars = 1;
strncpy(result, name + 1, strlen(name+1));
udf_chars += strlen(name);
};
*result_len = udf_chars;
}
/* --------------------------------------------------------------------- */
/*
* Timestamp to timespec conversion code is taken with small modifications
* from FreeBSDs /sys/fs/udf by Scott Long <scottl@freebsd.org>. Added with
* permission from Scott.
*/
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;
}
void
udf_timestamp_to_timespec(struct udf_mount *ump,
struct timestamp *timestamp,
struct timespec *timespec)
{
uint32_t usecs, secs, nsecs;
uint16_t tz;
int i, lpyear, daysinyear, year;
timespec->tv_sec = secs = 0;
timespec->tv_nsec = nsecs = 0;
/*
* DirectCD seems to like using bogus year values.
*
* Distrust time->month especially, since it will be used for an array
* index.
*/
year = udf_rw16(timestamp->year);
if ((year < 1970) || (timestamp->month > 12)) {
return;
}
/* Calculate the time and day
* Day is 1-31, Month is 1-12
*/
usecs = timestamp->usec +
100*timestamp->hund_usec + 10000*timestamp->centisec;
nsecs = usecs * 1000;
secs = timestamp->second;
secs += timestamp->minute * 60;
secs += timestamp->hour * 3600;
secs += (timestamp->day-1) * 3600 * 24;
/* Calclulate the month */
lpyear = udf_isaleapyear(year);
for (i = 1; i < timestamp->month; i++)
secs += mon_lens[lpyear][i-1] * 3600 * 24;
for (i = 1970; i < year; i++) {
daysinyear = udf_isaleapyear(i) + 365 ;
secs += 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 = udf_rw16(timestamp->type_tz);
tz &= 0x0fff; /* only lower 12 bits are significant */
if (tz & 0x0800) /* sign extention */
tz |= 0xf000;
/* TODO check timezone conversion */
/* check if we are specified a timezone to convert */
if (udf_rw16(timestamp->type_tz) & 0x1000) {
if ((int16_t) tz != -2047)
secs -= (int16_t) tz * 60;
} else {
secs -= ump->mount_args.gmtoff;
};
timespec->tv_sec = secs;
timespec->tv_nsec = nsecs;
}
/* --------------------------------------------------------------------- */
/*
* Attribute and filetypes converters with get/set pairs
*/
uint32_t
udf_getaccessmode(struct udf_node *udf_node)
{
struct file_entry *fe;
struct extfile_entry *efe;
uint32_t udf_perm, icbftype;
uint32_t mode, ftype;
uint16_t icbflags;
if (udf_node->fe) {
fe = udf_node->fe;
udf_perm = udf_rw32(fe->perm);
icbftype = fe->icbtag.file_type;
icbflags = udf_rw16(fe->icbtag.flags);
} else {
assert(udf_node->efe);
efe = udf_node->efe;
udf_perm = udf_rw32(efe->perm);
icbftype = efe->icbtag.file_type;
icbflags = udf_rw16(efe->icbtag.flags);
};
mode = udf_perm_to_unix_mode(udf_perm);
ftype = udf_icb_to_unix_filetype(icbftype);
/* set suid, sgid, sticky from flags in fe/efe */
if (icbflags & UDF_ICB_TAG_FLAGS_SETUID)
mode |= S_ISUID;
if (icbflags & UDF_ICB_TAG_FLAGS_SETGID)
mode |= S_ISGID;
if (icbflags & UDF_ICB_TAG_FLAGS_STICKY)
mode |= S_ISVTX;
return mode | ftype;
}
/* --------------------------------------------------------------------- */
/*
* Directory read and manipulation functions
*/
int
udf_lookup_name_in_dir(struct vnode *vp, const char *name, int namelen,
struct long_ad *icb_loc)
{
struct udf_node *dir_node = VTOI(vp);
struct file_entry *fe;
struct extfile_entry *efe;
struct fileid_desc *fid;
struct dirent dirent;
uint64_t file_size, diroffset;
uint32_t lb_size;
int found, error;
/* get directory filesize */
if (dir_node->fe) {
fe = dir_node->fe;
file_size = udf_rw64(fe->inf_len);
} else {
assert(dir_node->efe);
efe = dir_node->efe;
file_size = udf_rw64(efe->inf_len);
};
/* allocate temporary space for fid */
lb_size = udf_rw32(dir_node->ump->logical_vol->lb_size);
fid = malloc(lb_size, M_TEMP, M_WAITOK);
found = 0;
diroffset = 0;
while (!found && (diroffset < file_size)) {
/* transfer a new fid/dirent */
error = udf_read_fid_stream(vp, &diroffset, fid, &dirent);
if (error)
break;
/* skip deleted entries */
if (fid->file_char & UDF_FILE_CHAR_DEL)
continue;
if ((strlen(dirent.d_name) == namelen) &&
(strncmp(dirent.d_name, name, namelen) == 0)) {
found = 1;
*icb_loc = fid->icb;
};
};
free(fid, M_TEMP);
return found;
}
/* --------------------------------------------------------------------- */
/*
* Read one fid and process it into a dirent and advance to the next (*fid)
* has to be allocated a logical block in size, (*dirent) struct dirent length
*/
int
udf_read_fid_stream(struct vnode *vp, uint64_t *offset,
struct fileid_desc *fid, struct dirent *dirent)
{
struct udf_node *dir_node = VTOI(vp);
struct udf_mount *ump = dir_node->ump;
struct file_entry *fe;
struct extfile_entry *efe;
struct uio dir_uio;
struct iovec dir_iovec;
uint32_t entry_length, lb_size;
uint64_t file_size;
char *fid_name;
int enough, error;
assert(fid);
assert(dirent);
assert(dir_node);
assert(offset);
assert(*offset != 1);
DPRINTF(FIDS, ("read_fid_stream called\n"));
/* check if we're past the end of the directory */
if (dir_node->fe) {
fe = dir_node->fe;
file_size = udf_rw64(fe->inf_len);
} else {
assert(dir_node->efe);
efe = dir_node->efe;
file_size = udf_rw64(efe->inf_len);
};
if (*offset >= file_size)
return EINVAL;
/* get maximum length of FID descriptor */
lb_size = udf_rw32(ump->logical_vol->lb_size);
/* initialise return values */
entry_length = 0;
memset(dirent, 0, sizeof(struct dirent));
memset(fid, 0, lb_size);
/* TODO use vn_rdwr instead of creating our own uio */
/* read part of the directory */
memset(&dir_uio, 0, sizeof(struct uio));
dir_uio.uio_rw = UIO_READ; /* read into this space */
dir_uio.uio_iovcnt = 1;
dir_uio.uio_iov = &dir_iovec;
UIO_SETUP_SYSSPACE(&dir_uio);
dir_iovec.iov_base = fid;
dir_iovec.iov_len = lb_size;
dir_uio.uio_offset = *offset;
/* limit length of read in piece */
dir_uio.uio_resid = MIN(file_size - (*offset), lb_size);
/* read the part into the fid space */
error = VOP_READ(vp, &dir_uio, IO_ALTSEMANTICS, NOCRED);
if (error)
return error;
/*
* Check if we got a whole descriptor.
* XXX Try to `resync' directory stream when something is very wrong.
*
*/
enough = (dir_uio.uio_offset - (*offset) >= UDF_FID_SIZE);
if (!enough) {
/* short dir ... */
return EIO;
};
/* check if our FID header is OK */
error = udf_check_tag(fid);
DPRINTFIF(FIDS, error, ("read fids: tag check failed\n"));
if (!error) {
if (udf_rw16(fid->tag.id) != TAGID_FID)
error = ENOENT;
};
DPRINTFIF(FIDS, !error, ("\ttag checked ok: got TAGID_FID\n"));
/* check for length */
if (!error) {
entry_length = udf_fidsize(fid, lb_size);
enough = (dir_uio.uio_offset - (*offset) >= entry_length);
};
DPRINTFIF(FIDS, !error, ("\tentry_length = %d, enough = %s\n",
entry_length, enough?"yes":"no"));
if (!enough) {
/* short dir ... bomb out */
return EIO;
};
/* check FID contents */
if (!error) {
error = udf_check_tag_payload((union dscrptr *) fid, lb_size);
DPRINTF(FIDS, ("\tpayload checked ok\n"));
};
if (error) {
/* note that is sometimes a bit quick to report */
printf("BROKEN DIRECTORY ENTRY\n");
/* RESYNC? */
/* TODO: use udf_resync_fid_stream */
return EIO;
};
DPRINTF(FIDS, ("\tinterpret FID\n"));
/* we got a whole and valid descriptor! */
/* create resulting dirent structure */
fid_name = (char *) fid->data + udf_rw16(fid->l_iu);
udf_to_unix_name(dirent->d_name,
fid_name, fid->l_fi, &ump->logical_vol->desc_charset);
/* '..' has no name, so provide one */
if (fid->file_char & UDF_FILE_CHAR_PAR)
strcpy(dirent->d_name, "..");
dirent->d_fileno = udf_calchash(&fid->icb); /* inode hash XXX */
dirent->d_namlen = strlen(dirent->d_name);
dirent->d_reclen = _DIRENT_SIZE(dirent);
/*
* Note that its not worth trying to go for the filetypes now... its
* too expensive too
*/
dirent->d_type = DT_UNKNOWN;
/* initial guess for filetype we can make */
if (fid->file_char & UDF_FILE_CHAR_DIR)
dirent->d_type = DT_DIR;
/* advance */
*offset += entry_length;
return error;
}
/* --------------------------------------------------------------------- */
/*
* block based file reading and writing
*/
static int
udf_read_internal(struct udf_node *node, uint8_t *blob)
{
struct udf_mount *ump;
struct file_entry *fe;
struct extfile_entry *efe;
uint64_t inflen;
uint32_t sector_size;
uint8_t *pos;
int icbflags, addr_type;
/* shut up gcc */
inflen = addr_type = icbflags = 0;
pos = NULL;
/* get extent and do some paranoia checks */
ump = node->ump;
sector_size = ump->discinfo.sector_size;
fe = node->fe;
efe = node->efe;
if (fe) {
inflen = udf_rw64(fe->inf_len);
pos = &fe->data[0] + udf_rw32(fe->l_ea);
icbflags = udf_rw16(fe->icbtag.flags);
};
if (efe) {
inflen = udf_rw64(efe->inf_len);
pos = &efe->data[0] + udf_rw32(efe->l_ea);
icbflags = udf_rw16(efe->icbtag.flags);
};
addr_type = icbflags & UDF_ICB_TAG_FLAGS_ALLOC_MASK;
assert(addr_type == UDF_ICB_INTERN_ALLOC);
assert(inflen < sector_size);
/* copy out info */
memset(blob, 0, sector_size);
memcpy(blob, pos, inflen);
return 0;
}
/* --------------------------------------------------------------------- */
/*
* Read file extent reads an extent specified in sectors from the file. It is
* sector based; i.e. no `fancy' offsets.
*/
int
udf_read_file_extent(struct udf_node *node,
uint32_t from, uint32_t sectors,
uint8_t *blob)
{
struct buf buf;
uint32_t sector_size;
BUF_INIT(&buf);
sector_size = node->ump->discinfo.sector_size;
buf.b_bufsize = sectors * sector_size;
buf.b_data = blob;
buf.b_bcount = buf.b_bufsize;
buf.b_resid = buf.b_bcount;
buf.b_flags = B_BUSY | B_READ;
buf.b_vp = node->vnode;
buf.b_proc = NULL;
buf.b_blkno = from;
buf.b_lblkno = 0;
BIO_SETPRIO(&buf, BPRIO_TIMELIMITED);
udf_read_filebuf(node, &buf);
return biowait(&buf);
}
/* --------------------------------------------------------------------- */
/*
* Read file extent in the buffer.
*
* The splitup of the extent into seperate request-buffers is to minimise
* copying around as much as possible.
*/
/* mininum of 128 translations (!) (64 kb in 512 byte sectors) */
#define FILEBUFSECT 128
void
udf_read_filebuf(struct udf_node *node, struct buf *buf)
{
struct buf *nestbuf;
uint64_t mapping[FILEBUFSECT];
uint64_t run_start;
uint32_t sector_size;
uint32_t buf_offset, sector, rbuflen, rblk;
uint8_t *buf_pos;
int error, run_length;
uint32_t from;
uint32_t sectors;
sector_size = node->ump->discinfo.sector_size;
from = buf->b_blkno;
sectors = buf->b_bcount / sector_size;
/* assure we have enough translation slots */
KASSERT(buf->b_bcount / sector_size <= FILEBUFSECT);
KASSERT(MAXPHYS / sector_size <= FILEBUFSECT);
if (sectors > FILEBUFSECT) {
printf("udf_read_filebuf: implementation limit on bufsize\n");
buf->b_error = EIO;
buf->b_flags |= B_ERROR;
biodone(buf);
return;
};
error = 0;
DPRINTF(READ, ("\ttranslate %d-%d\n", from, sectors));
error = udf_translate_file_extent(node, from, sectors, mapping);
if (error) {
buf->b_error = error;
buf->b_flags |= B_ERROR;
biodone(buf);
return;
};
DPRINTF(READ, ("\ttranslate extent went OK\n"));
/* pre-check if internal or parts are zero */
if (*mapping == UDF_TRANS_INTERN) {
error = udf_read_internal(node, (uint8_t *) buf->b_data);
if (error) {
buf->b_error = error;
buf->b_flags |= B_ERROR;
};
biodone(buf);
return;
};
DPRINTF(READ, ("\tnot intern\n"));
/* request read-in of data from disc sheduler */
buf->b_resid = buf->b_bcount;
for (sector = 0; sector < sectors; sector++) {
buf_offset = sector * sector_size;
buf_pos = (uint8_t *) buf->b_data + buf_offset;
DPRINTF(READ, ("\tprocessing rel sector %d\n", sector));
switch (mapping[sector]) {
case UDF_TRANS_UNMAPPED:
case UDF_TRANS_ZERO:
/* copy zero sector */
memset(buf_pos, 0, sector_size);
DPRINTF(READ, ("\treturning zero sector\n"));
nestiobuf_done(buf, sector_size, 0);
break;
default :
DPRINTF(READ, ("\tread sector "
"%"PRIu64"\n", mapping[sector]));
run_start = mapping[sector];
run_length = 1;
while (sector < sectors-1) {
if (mapping[sector+1] != mapping[sector]+1)
break;
run_length++;
sector++;
};
/*
* nest an iobuf and mark it for async reading. Since
* we're using nested buffers, they can't be cached by
* design.
*/
rbuflen = run_length * sector_size;
rblk = run_start * (sector_size/DEV_BSIZE);
nestbuf = getiobuf();
nestiobuf_setup(buf, nestbuf, buf_offset, rbuflen);
/* nestbuf is B_ASYNC */
/* CD shedules on raw blkno */
nestbuf->b_blkno = rblk;
nestbuf->b_proc = NULL;
nestbuf->b_cylinder = 0;
nestbuf->b_rawblkno = rblk;
VOP_STRATEGY(node->ump->devvp, nestbuf);
};
};
DPRINTF(READ, ("\tend of read_filebuf\n"));
}
#undef FILEBUFSECT
/* --------------------------------------------------------------------- */
/*
* Translate an extent (in sectors) into sector numbers; used for read and
* write operations. DOESNT't check extents.
*/
int
udf_translate_file_extent(struct udf_node *node,
uint32_t from, uint32_t pages,
uint64_t *map)
{
struct udf_mount *ump;
struct file_entry *fe;
struct extfile_entry *efe;
struct short_ad *s_ad;
struct long_ad *l_ad, t_ad;
uint64_t transsec;
uint32_t sector_size, transsec32;
uint32_t overlap, translen;
uint32_t vpart_num, lb_num, len, alloclen;
uint8_t *pos;
int error, flags, addr_type, icblen, icbflags;
if (!node)
return ENOENT;
/* shut up gcc */
alloclen = addr_type = icbflags = 0;
pos = NULL;
/* do the work */
ump = node->ump;
sector_size = ump->discinfo.sector_size;
fe = node->fe;
efe = node->efe;
if (fe) {
alloclen = udf_rw32(fe->l_ad);
pos = &fe->data[0] + udf_rw32(fe->l_ea);
icbflags = udf_rw16(fe->icbtag.flags);
};
if (efe) {
alloclen = udf_rw32(efe->l_ad);
pos = &efe->data[0] + udf_rw32(efe->l_ea);
icbflags = udf_rw16(efe->icbtag.flags);
};
addr_type = icbflags & UDF_ICB_TAG_FLAGS_ALLOC_MASK;
DPRINTF(TRANSLATE, ("udf trans: alloc_len = %d, addr_type %d, "
"fe %p, efe %p\n", alloclen, addr_type, fe, efe));
vpart_num = udf_rw16(node->loc.loc.part_num);
lb_num = len = icblen = 0; /* shut up gcc */
while (pages && alloclen) {
DPRINTF(TRANSLATE, ("\taddr_type %d\n", addr_type));
switch (addr_type) {
case UDF_ICB_INTERN_ALLOC :
/* TODO check extents? */
*map = UDF_TRANS_INTERN;
return 0;
case UDF_ICB_SHORT_ALLOC :
icblen = sizeof(struct short_ad);
s_ad = (struct short_ad *) pos;
len = udf_rw32(s_ad->len);
lb_num = udf_rw32(s_ad->lb_num);
break;
case UDF_ICB_LONG_ALLOC :
icblen = sizeof(struct long_ad);
l_ad = (struct long_ad *) pos;
len = udf_rw32(l_ad->len);
lb_num = udf_rw32(l_ad->loc.lb_num);
vpart_num = udf_rw16(l_ad->loc.part_num);
DPRINTFIF(TRANSLATE,
(l_ad->impl.im_used.flags &
UDF_ADIMP_FLAGS_EXTENT_ERASED),
("UDF: got an `extent erased' flag in long_ad\n"));
break;
default:
/* can't be here */
return EINVAL; /* for sure */
};
/* process extent */
flags = UDF_EXT_FLAGS(len);
len = UDF_EXT_LEN(len);
overlap = (len + sector_size -1) / sector_size;
if (from) {
if (from > overlap) {
from -= overlap;
overlap = 0;
} else {
lb_num += from; /* advance in extent */
overlap -= from;
from = 0;
};
};
overlap = MIN(overlap, pages);
while (overlap) {
switch (flags) {
case UDF_EXT_REDIRECT :
/* no support for allocation extentions yet */
/* TODO support for allocation extention */
return ENOENT;
case UDF_EXT_FREED :
case UDF_EXT_FREE :
transsec = UDF_TRANS_ZERO;
translen = overlap;
while (overlap && pages && translen) {
*map++ = transsec;
overlap--; pages--; translen--;
};
break;
case UDF_EXT_ALLOCATED :
t_ad.loc.lb_num = udf_rw32(lb_num);
t_ad.loc.part_num = udf_rw16(vpart_num);
error = udf_translate_vtop(ump,
&t_ad, &transsec32, &translen);
transsec = transsec32;
if (error)
return error;
while (overlap && pages && translen) {
*map++ = transsec;
transsec++;
overlap--; pages--; translen--;
};
break;
};
};
pos += icblen;
alloclen -= icblen;
};
return 0;
}
/* --------------------------------------------------------------------- */
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