/*
* Fill out the disk parameter structure. Return SDGP_RESULT_OK if the
* structure is correctly filled in, SDGP_RESULT_OFFLINE otherwise. The caller
* is responsible for clearing the SDEV_MEDIA_LOADED flag if the structure
* cannot be completed.
*/
int
sd_get_parms(struct sd_softc *sc, struct disk_parms *dp, int flags)
{
union scsi_mode_sense_buf *buf = NULL;
struct page_rigid_geometry *rigid = NULL;
struct page_flex_geometry *flex = NULL;
struct page_reduced_geometry *reduced = NULL;
u_char *page0 = NULL;
u_int32_t heads = 0, sectors = 0, cyls = 0, secsize = 0;
int err = 0, big;
if (sd_size(sc, flags) != 0)
return (SDGP_RESULT_OFFLINE);
if (ISSET(sc->flags, SDF_THIN) && sd_thin_params(sc, flags) != 0) {
/* we dont know the unmap limits, so we cant use thin shizz */
CLR(sc->flags, SDF_THIN);
}
buf = dma_alloc(sizeof(*buf), PR_NOWAIT);
if (buf == NULL)
goto validate;
/*
* Ask for page 0 (vendor specific) mode sense data to find
* READONLY info. The only thing USB devices will ask for.
*/
err = scsi_do_mode_sense(sc->sc_link, 0, buf, (void **)&page0,
NULL, NULL, NULL, 1, flags | SCSI_SILENT, &big);
if (err == 0) {
if (big && buf->hdr_big.dev_spec & SMH_DSP_WRITE_PROT)
SET(sc->sc_link->flags, SDEV_READONLY);
else if (!big && buf->hdr.dev_spec & SMH_DSP_WRITE_PROT)
SET(sc->sc_link->flags, SDEV_READONLY);
else
CLR(sc->sc_link->flags, SDEV_READONLY);
}
/*
* Many UMASS devices choke when asked about their geometry. Most
* don't have a meaningful geometry anyway, so just fake it if
* scsi_size() worked.
*/
if ((sc->sc_link->flags & SDEV_UMASS) && (dp->disksize > 0))
goto validate;
switch (sc->sc_link->inqdata.device & SID_TYPE) {
case T_OPTICAL:
/* No more information needed or available. */
break;
case T_RDIRECT:
/* T_RDIRECT supports only PAGE_REDUCED_GEOMETRY (6). */
err = scsi_do_mode_sense(sc->sc_link, PAGE_REDUCED_GEOMETRY,
buf, (void **)&reduced, NULL, NULL, &secsize,
sizeof(*reduced), flags | SCSI_SILENT, NULL);
if (!err && reduced &&
DISK_PGCODE(reduced, PAGE_REDUCED_GEOMETRY)) {
if (dp->disksize == 0)
dp->disksize = _5btol(reduced->sectors);
if (secsize == 0)
secsize = _2btol(reduced->bytes_s);
}
break;
default:
/*
* NOTE: Some devices leave off the last four bytes of
* PAGE_RIGID_GEOMETRY and PAGE_FLEX_GEOMETRY mode sense pages.
* The only information in those four bytes is RPM information
* so accept the page. The extra bytes will be zero and RPM will
* end up with the default value of 3600.
*/
if (((sc->sc_link->flags & SDEV_ATAPI) == 0) ||
((sc->sc_link->flags & SDEV_REMOVABLE) == 0))
err = scsi_do_mode_sense(sc->sc_link,
PAGE_RIGID_GEOMETRY, buf, (void **)&rigid, NULL,
NULL, &secsize, sizeof(*rigid) - 4,
flags | SCSI_SILENT, NULL);
if (!err && rigid && DISK_PGCODE(rigid, PAGE_RIGID_GEOMETRY)) {
heads = rigid->nheads;
cyls = _3btol(rigid->ncyl);
if (heads * cyls > 0)
sectors = dp->disksize / (heads * cyls);
} else {
err = scsi_do_mode_sense(sc->sc_link,
PAGE_FLEX_GEOMETRY, buf, (void **)&flex, NULL, NULL,
&secsize, sizeof(*flex) - 4,
flags | SCSI_SILENT, NULL);
if (!err && flex &&
DISK_PGCODE(flex, PAGE_FLEX_GEOMETRY)) {
sectors = flex->ph_sec_tr;
heads = flex->nheads;
cyls = _2btol(flex->ncyl);
if (secsize == 0)
secsize = _2btol(flex->bytes_s);
if (dp->disksize == 0)
dp->disksize = heads * cyls * sectors;
}
}
break;
}
validate:
if (buf)
dma_free(buf, sizeof(*buf));
if (dp->disksize == 0)
return (SDGP_RESULT_OFFLINE);
if (dp->secsize == 0)
dp->secsize = (secsize == 0) ? 512 : secsize;
/*
* Restrict secsize values to powers of two between 512 and 64k.
*/
switch (dp->secsize) {
case 0x200: /* == 512, == DEV_BSIZE on all architectures. */
case 0x400:
case 0x800:
case 0x1000:
case 0x2000:
case 0x4000:
case 0x8000:
case 0x10000:
break;
default:
SC_DEBUG(sc->sc_link, SDEV_DB1,
("sd_get_parms: bad secsize: %#x\n", dp->secsize));
return (SDGP_RESULT_OFFLINE);
}
/*
* XXX THINK ABOUT THIS!! Using values such that sectors * heads *
* cyls is <= disk_size can lead to wasted space. We need a more
* careful calculation/validation to make everything work out
* optimally.
*/
if (dp->disksize > 0xffffffff && (dp->heads * dp->sectors) < 0xffff) {
dp->heads = 511;
dp->sectors = 255;
cyls = 0;
} else {
/*
* Use standard geometry values for anything we still don't
* know.
*/
dp->heads = (heads == 0) ? 255 : heads;
dp->sectors = (sectors == 0) ? 63 : sectors;
}
dp->cyls = (cyls == 0) ? dp->disksize / (dp->heads * dp->sectors) :
cyls;
if (dp->cyls == 0) {
dp->heads = dp->cyls = 1;
dp->sectors = dp->disksize;
}
return (SDGP_RESULT_OK);
}
/* preconditions: reiserfs_read_super already executed, therefore
* INFO block is valid
* returns: 0 if error, nonzero iff we were able to find the file successfully
* postconditions: on a nonzero return, INFO->fileinfo contains the info
* of the file we were trying to look up, filepos is 0 and filemax is
* the size of the file.
*/
static int
reiserfs_open_file( char *dirname )
{
struct reiserfs_de_head *de_head;
char *rest, ch;
__u32 dir_id, objectid, parent_dir_id = 0, parent_objectid = 0;
char linkbuf[PATH_MAX]; /* buffer for following symbolic links */
int link_count = 0;
int mode;
errnum = 0;
dir_id = cpu_to_le32(REISERFS_ROOT_PARENT_OBJECTID);
objectid = cpu_to_le32(REISERFS_ROOT_OBJECTID);
while ( 1 )
{
DEBUG_F( "dirname=%s\n", dirname );
/* Search for the stat info first. */
if ( !search_stat( dir_id, objectid ) )
return 0;
DEBUG_F( "sd_mode=0%o sd_size=%Lu\n",
sd_mode((struct stat_data *) INFO->current_item ),
sd_size(INFO->current_ih, INFO->current_item ));
mode = sd_mode((struct stat_data *)INFO->current_item);
/* If we've got a symbolic link, then chase it. */
if ( S_ISLNK( mode ) )
{
int len = 0;
DEBUG_F("link count = %d\n", link_count);
DEBUG_SLEEP;
if ( ++link_count > MAX_LINK_COUNT )
{
DEBUG_F("Symlink loop\n");
errnum = FILE_ERR_SYMLINK_LOOP;
return 0;
}
/* Get the symlink size. */
INFO->file->len = sd_size(INFO->current_ih, INFO->current_item);
/* Find out how long our remaining name is. */
while ( dirname[len] && !isspace( dirname[len] ) )
len++;
if ( INFO->file->len + len > sizeof ( linkbuf ) - 1 )
{
errnum = FILE_ERR_LENGTH;
return 0;
}
/* Copy the remaining name to the end of the symlink data. Note *
* that DIRNAME and LINKBUF may overlap! */
memmove( linkbuf + INFO->file->len, dirname, len + 1 );
INFO->fileinfo.k_dir_id = dir_id;
INFO->fileinfo.k_objectid = objectid;
INFO->file->pos = 0;
if ( !next_key()
|| reiserfs_read_data( linkbuf, INFO->file->len ) != INFO->file->len ) {
DEBUG_F("reiserfs_open_file - if !next_key || reiserfs_read_data\n");
DEBUG_SLEEP;
errnum = FILE_IOERR;
return 0;
}
DEBUG_F( "symlink=%s\n", linkbuf );
DEBUG_SLEEP;
dirname = linkbuf;
if ( *dirname == '/' )
{
/* It's an absolute link, so look it up in root. */
dir_id = cpu_to_le32(REISERFS_ROOT_PARENT_OBJECTID);
objectid = cpu_to_le32(REISERFS_ROOT_OBJECTID);
}
else
{
/* Relative, so look it up in our parent directory. */
dir_id = parent_dir_id;
objectid = parent_objectid;
}
/* Now lookup the new name. */
continue;
}
/* if we have a real file (and we're not just printing *
* possibilities), then this is where we want to exit */
if ( !*dirname || isspace( *dirname ) )
{
if ( !S_ISREG( mode ) )
{
errnum = FILE_ERR_BAD_TYPE;
return 0;
}
INFO->file->pos = 0;
INFO->file->len = sd_size(INFO->current_ih, INFO->current_item);
INFO->fileinfo.k_dir_id = dir_id;
INFO->fileinfo.k_objectid = objectid;
return next_key();
}
/* continue with the file/directory name interpretation */
while ( *dirname == '/' )
dirname++;
if ( !S_ISDIR( mode ) )
{
errnum = FILE_ERR_NOTDIR;
return 0;
}
for ( rest = dirname; ( ch = *rest ) && !isspace( ch ) && ch != '/';
rest++ ) ;
*rest = 0;
while ( 1 )
{
char *name_end;
int num_entries;
if ( !next_key() )
return 0;
if ( INFO->current_ih->ih_key.k_objectid != objectid )
break;
name_end = INFO->current_item + ih_item_len(INFO->current_ih);
de_head = ( struct reiserfs_de_head * ) INFO->current_item;
num_entries = ih_entry_count(INFO->current_ih);
while ( num_entries > 0 )
{
char *filename = INFO->current_item + deh_location(de_head);
char tmp = *name_end;
if( deh_state(de_head) & (1 << DEH_Visible))
{
int cmp;
/* Directory names in ReiserFS are not null * terminated.
* We write a temporary 0 behind it. * NOTE: that this
* may overwrite the first block in * the tree cache.
* That doesn't hurt as long as we * don't call next_key
* () in between. */
*name_end = 0;
cmp = strcmp( dirname, filename );
*name_end = tmp;
if ( cmp == 0 )
goto found;
}
/* The beginning of this name marks the end of the next name.
*/
name_end = filename;
de_head++;
num_entries--;
}
}
errnum = FILE_ERR_NOTFOUND;
*rest = ch;
return 0;
found:
*rest = ch;
dirname = rest;
parent_dir_id = dir_id;
parent_objectid = objectid;
dir_id = de_head->deh_dir_id; /* LE */
objectid = de_head->deh_objectid; /* LE */
}
}
