diff options
Diffstat (limited to 'drivers/cdrom')
| -rw-r--r-- | drivers/cdrom/cdrom.c | 101 |
1 files changed, 51 insertions, 50 deletions
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c index fac603a16a15..8888ed3a8d4f 100644 --- a/drivers/cdrom/cdrom.c +++ b/drivers/cdrom/cdrom.c @@ -338,7 +338,6 @@ do { \ /* Not-exported routines. */ -static int cdrom_get_next_writable(struct cdrom_device_info *, long *); static void cdrom_count_tracks(struct cdrom_device_info *, tracktype*); static int cdrom_mrw_exit(struct cdrom_device_info *cdi); @@ -2836,6 +2835,57 @@ use_toc: return 0; } +/* return the next writable block. also for udf file system. */ +static int cdrom_get_next_writable(struct cdrom_device_info *cdi, + long *next_writable) +{ + disc_information di; + track_information ti; + __u16 last_track; + int ret, ti_size; + + if (!CDROM_CAN(CDC_GENERIC_PACKET)) + goto use_last_written; + + ret = cdrom_get_disc_info(cdi, &di); + if (ret < 0 || ret < offsetof(typeof(di), last_track_lsb) + + sizeof(di.last_track_lsb)) + goto use_last_written; + + /* if unit didn't return msb, it's zeroed by cdrom_get_disc_info */ + last_track = (di.last_track_msb << 8) | di.last_track_lsb; + ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti); + if (ti_size < 0 || ti_size < offsetof(typeof(ti), track_start)) + goto use_last_written; + + /* if this track is blank, try the previous. */ + if (ti.blank) { + if (last_track == 1) + goto use_last_written; + last_track--; + ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti); + if (ti_size < 0) + goto use_last_written; + } + + /* if next recordable address field is valid, use it. */ + if (ti.nwa_v && ti_size >= offsetof(typeof(ti), next_writable) + + sizeof(ti.next_writable)) { + *next_writable = be32_to_cpu(ti.next_writable); + return 0; + } + +use_last_written: + ret = cdrom_get_last_written(cdi, next_writable); + if (ret) { + *next_writable = 0; + return ret; + } else { + *next_writable += 7; + return 0; + } +} + static noinline int mmc_ioctl_cdrom_read_data(struct cdrom_device_info *cdi, void __user *arg, struct packet_command *cgc, @@ -3339,55 +3389,6 @@ static int cdrom_get_disc_info(struct cdrom_device_info *cdi, disc_information * return buflen; } -/* return the next writable block. also for udf file system. */ -static int cdrom_get_next_writable(struct cdrom_device_info *cdi, long *next_writable) -{ - disc_information di; - track_information ti; - __u16 last_track; - int ret, ti_size; - - if (!CDROM_CAN(CDC_GENERIC_PACKET)) - goto use_last_written; - - ret = cdrom_get_disc_info(cdi, &di); - if (ret < 0 || ret < offsetof(typeof(di), last_track_lsb) - + sizeof(di.last_track_lsb)) - goto use_last_written; - - /* if unit didn't return msb, it's zeroed by cdrom_get_disc_info */ - last_track = (di.last_track_msb << 8) | di.last_track_lsb; - ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti); - if (ti_size < 0 || ti_size < offsetof(typeof(ti), track_start)) - goto use_last_written; - - /* if this track is blank, try the previous. */ - if (ti.blank) { - if (last_track == 1) - goto use_last_written; - last_track--; - ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti); - if (ti_size < 0) - goto use_last_written; - } - - /* if next recordable address field is valid, use it. */ - if (ti.nwa_v && ti_size >= offsetof(typeof(ti), next_writable) - + sizeof(ti.next_writable)) { - *next_writable = be32_to_cpu(ti.next_writable); - return 0; - } - -use_last_written: - if ((ret = cdrom_get_last_written(cdi, next_writable))) { - *next_writable = 0; - return ret; - } else { - *next_writable += 7; - return 0; - } -} - EXPORT_SYMBOL(cdrom_get_last_written); EXPORT_SYMBOL(register_cdrom); EXPORT_SYMBOL(unregister_cdrom); |