diff --git a/src/udev/cdrom_id/cdrom_id.c b/src/udev/cdrom_id/cdrom_id.c index cbd65d6375..9da4f56ae9 100644 --- a/src/udev/cdrom_id/cdrom_id.c +++ b/src/udev/cdrom_id/cdrom_id.c @@ -501,6 +501,117 @@ static const char * const media_state_table[_MEDIA_STATE_MAX] = { DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(media_state, MediaState); +static int dvd_ram_media_update_state(Context *c) { + struct scsi_cmd sc; + unsigned char dvdstruct[8]; + unsigned char format[12]; + unsigned char len; + int r; + + assert(c); + + /* Return 1 if media state is determined. */ + + if (c->media_feature != FEATURE_DVD_RAM) + return 0; + + /* a write protected dvd-ram may report "complete" status */ + scsi_cmd_init(&sc); + scsi_cmd_set(&sc, 0, GPCMD_READ_DVD_STRUCTURE); + scsi_cmd_set(&sc, 7, 0xC0); + scsi_cmd_set(&sc, 9, sizeof(dvdstruct)); + scsi_cmd_set(&sc, 11, 0); + r = scsi_cmd_run_and_log(&sc, c->fd, dvdstruct, sizeof(dvdstruct), "read DVD structure"); + if (r < 0) + return r; + + if (dvdstruct[4] & 0x02) { + c->media_state = MEDIA_STATE_COMPLETE; + log_debug("write-protected DVD-RAM media inserted"); + return 1; + } + + /* let's make sure we don't try to read unformatted media */ + scsi_cmd_init(&sc); + scsi_cmd_set(&sc, 0, GPCMD_READ_FORMAT_CAPACITIES); + scsi_cmd_set(&sc, 8, sizeof(format)); + scsi_cmd_set(&sc, 9, 0); + r = scsi_cmd_run_and_log(&sc, c->fd, format, sizeof(format), "read DVD format capacities"); + if (r < 0) + return r; + + len = format[3]; + if (len & 7 || len < 16) + return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), + "invalid format capacities length"); + + switch(format[8] & 3) { + case 1: + /* This means that last format was interrupted or failed, blank dvd-ram discs are + * factory formatted. Take no action here as it takes quite a while to reformat a + * dvd-ram and it's not automatically started. */ + log_debug("unformatted DVD-RAM media inserted"); + return 1; + + case 2: + log_debug("formatted DVD-RAM media inserted"); + return 0; + + case 3: + c->has_media = false; + return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM), + "format capacities returned no media"); + } + + return 0; +} + +static int dvd_media_update_state(Context *c) { + struct scsi_cmd sc; + unsigned char buffer[32 * 2048]; + int offset, r; + + r = dvd_ram_media_update_state(c); + if (r != 0) + return r; + + /* Take a closer look at formatted media (unformatted DVD+RW + * has "blank" status", DVD-RAM was examined earlier) and check + * for ISO and UDF PVDs or a fs superblock presence and do it + * in one ioctl (we need just sectors 0 and 16) */ + + scsi_cmd_init(&sc); + scsi_cmd_set(&sc, 0, GPCMD_READ_10); + scsi_cmd_set(&sc, 5, 0); + scsi_cmd_set(&sc, 8, sizeof(buffer)/2048); + scsi_cmd_set(&sc, 9, 0); + r = scsi_cmd_run_and_log(&sc, c->fd, buffer, sizeof(buffer), "read first 32 blocks"); + if (r < 0) { + c->has_media = false; + return r; + } + + /* if any non-zero data is found in sector 16 (iso and udf) or + * eventually 0 (fat32 boot sector, ext2 superblock, etc), disc + * is assumed non-blank */ + + for (offset = 32768; offset < 32768 + 2048; offset++) + if (buffer[offset] != 0) { + log_debug("data in block 16, assuming complete"); + return 0; + } + + for (offset = 0; offset < 2048; offset++) + if (buffer[offset] != 0) { + log_debug("data in block 0, assuming complete"); + return 0; + } + + log_debug("no data in blocks 0 or 16, assuming blank"); + c->media_state = MEDIA_STATE_BLANK; + return 0; +} + static int cd_media_info(Context *c) { struct scsi_cmd sc; unsigned char header[32]; @@ -538,104 +649,11 @@ static int cd_media_info(Context *c) { * write protected; we need to check the contents if it is blank */ if (IN_SET(c->media_feature, FEATURE_DVD_RW_RO, FEATURE_DVD_PLUS_RW, FEATURE_DVD_PLUS_RW_DL, FEATURE_DVD_RAM) && IN_SET(state, MEDIA_STATE_COMPLETE, MEDIA_STATE_OTHER)) { - unsigned char buffer[32 * 2048]; - unsigned char len; - int offset; - - if (c->media_feature == FEATURE_DVD_RAM) { - /* a write protected dvd-ram may report "complete" status */ - - unsigned char dvdstruct[8]; - unsigned char format[12]; - - scsi_cmd_init(&sc); - scsi_cmd_set(&sc, 0, GPCMD_READ_DVD_STRUCTURE); - scsi_cmd_set(&sc, 7, 0xC0); - scsi_cmd_set(&sc, 9, sizeof(dvdstruct)); - scsi_cmd_set(&sc, 11, 0); - r = scsi_cmd_run_and_log(&sc, c->fd, dvdstruct, sizeof(dvdstruct), "read DVD structure"); - if (r < 0) - return r; - - if (dvdstruct[4] & 0x02) { - c->media_state = MEDIA_STATE_COMPLETE; - log_debug("write-protected DVD-RAM media inserted"); - goto determined; - } - - /* let's make sure we don't try to read unformatted media */ - scsi_cmd_init(&sc); - scsi_cmd_set(&sc, 0, GPCMD_READ_FORMAT_CAPACITIES); - scsi_cmd_set(&sc, 8, sizeof(format)); - scsi_cmd_set(&sc, 9, 0); - r = scsi_cmd_run_and_log(&sc, c->fd, format, sizeof(format), "read DVD format capacities"); - if (r < 0) - return r; - - len = format[3]; - if (len & 7 || len < 16) - return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), - "invalid format capacities length"); - - switch(format[8] & 3) { - case 1: - log_debug("unformatted DVD-RAM media inserted"); - /* This means that last format was interrupted - * or failed, blank dvd-ram discs are factory - * formatted. Take no action here as it takes - * quite a while to reformat a dvd-ram and it's - * not automatically started */ - goto determined; - - case 2: - log_debug("formatted DVD-RAM media inserted"); - break; - - case 3: - c->has_media = false; - return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM), - "format capacities returned no media"); - } - } - - /* Take a closer look at formatted media (unformatted DVD+RW - * has "blank" status", DVD-RAM was examined earlier) and check - * for ISO and UDF PVDs or a fs superblock presence and do it - * in one ioctl (we need just sectors 0 and 16) */ - scsi_cmd_init(&sc); - scsi_cmd_set(&sc, 0, GPCMD_READ_10); - scsi_cmd_set(&sc, 5, 0); - scsi_cmd_set(&sc, 8, sizeof(buffer)/2048); - scsi_cmd_set(&sc, 9, 0); - r = scsi_cmd_run_and_log(&sc, c->fd, buffer, sizeof(buffer), "read first 32 blocks"); - if (r < 0) { - c->has_media = false; + r = dvd_media_update_state(c); + if (r < 0) return r; - } - - /* if any non-zero data is found in sector 16 (iso and udf) or - * eventually 0 (fat32 boot sector, ext2 superblock, etc), disc - * is assumed non-blank */ - - for (offset = 32768; offset < (32768 + 2048); offset++) { - if (buffer [offset]) { - log_debug("data in block 16, assuming complete"); - goto determined; - } - } - - for (offset = 0; offset < 2048; offset++) { - if (buffer [offset]) { - log_debug("data in block 0, assuming complete"); - goto determined; - } - } - - c->media_state = MEDIA_STATE_BLANK; - log_debug("no data in blocks 0 or 16, assuming blank"); } -determined: /* "other" is e. g. DVD-RAM, can't append sessions there; DVDs in * restricted overwrite mode can never append, only in sequential mode */ if (c->media_feature != FEATURE_DVD_RW_RO && IN_SET(state, MEDIA_STATE_BLANK, MEDIA_STATE_APPENDABLE))