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udev/cdrom: introduce enum for media state

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This commit is contained in:
Yu Watanabe 2020-12-25 02:57:37 +09:00 committed by Luca Boccassi
parent 97b2248475
commit 530a715ea9
1 changed files with 40 additions and 18 deletions
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58
src/udev/cdrom_id/cdrom_id.c
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@ -26,6 +26,8 @@
#include "memory-util.h"
#include "random-util.h"
#include "sort-util.h"
#include "string-table.h"
#include "string-util.h"
#include "udev-util.h"
static bool arg_eject = false;
@ -83,6 +85,15 @@ typedef enum Feature {
_FEATURE_INVALID = -1,
} Feature;
typedef enum MediaState {
MEDIA_STATE_BLANK = 0,
MEDIA_STATE_APPENDABLE = 1,
MEDIA_STATE_COMPLETE = 2,
MEDIA_STATE_OTHER = 3,
_MEDIA_STATE_MAX,
_MEDIA_STATE_INVALID = -1,
} MediaState;
typedef struct Context {
int fd;
@ -93,7 +104,7 @@ typedef struct Context {
Feature media_feature;
bool has_media;
const char *media_state;
MediaState media_state;
unsigned media_session_next;
unsigned media_session_count;
unsigned media_track_count;
@ -116,6 +127,7 @@ static void context_init(Context *c) {
*c = (Context) {
.fd = -1,
.media_feature = _FEATURE_INVALID,
.media_state = _MEDIA_STATE_INVALID,
};
}
@ -480,15 +492,19 @@ static int cd_profiles(Context *c) {
return c->has_media;
}
static const char * const media_state_table[_MEDIA_STATE_MAX] = {
[MEDIA_STATE_BLANK] = "blank",
[MEDIA_STATE_APPENDABLE] = "appendable",
[MEDIA_STATE_COMPLETE] = "complete",
[MEDIA_STATE_OTHER] = "other",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(media_state, MediaState);
static int cd_media_info(Context *c) {
struct scsi_cmd sc;
unsigned char header[32];
static const char *const media_status[] = {
"blank",
"appendable",
"complete",
"other"
};
MediaState state;
int r;
assert(c);
@ -503,22 +519,25 @@ static int cd_media_info(Context *c) {
c->has_media = true;
log_debug("disk type %02x", header[8]);
log_debug("hardware reported media status: %s", media_status[header[2] & 3]);
state = (MediaState) (header[2] & 0x03);
log_debug("hardware reported media status: %s", strna(media_state_to_string(state)));
/* exclude plain CDROM, some fake cdroms return 0 for "blank" media here */
if (c->media_feature != FEATURE_CD_ROM)
c->media_state = media_status[header[2] & 3];
c->media_state = state;
/* fresh DVD-RW in restricted overwrite mode reports itself as
* "appendable"; change it to "blank" to make it consistent with what
* gets reported after blanking, and what userspace expects */
if (c->media_feature == FEATURE_DVD_RW_RO && (header[2] & 3) == 1)
c->media_state = media_status[0];
* gets reported after blanking, and what userspace expects. */
if (c->media_feature == FEATURE_DVD_RW_RO && state == MEDIA_STATE_APPENDABLE)
c->media_state = MEDIA_STATE_BLANK;
/* DVD+RW discs (and DVD-RW in restricted mode) once formatted are
* always "complete", DVD-RAM are "other" or "complete" if the disc is
* 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) && (header[2] & 3) > 1) {
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;
@ -539,7 +558,7 @@ static int cd_media_info(Context *c) {
return r;
if (dvdstruct[4] & 0x02) {
c->media_state = media_status[2];
c->media_state = MEDIA_STATE_COMPLETE;
log_debug("write-protected DVD-RAM media inserted");
goto determined;
}
@ -612,14 +631,14 @@ static int cd_media_info(Context *c) {
}
}
c->media_state = media_status[0];
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 ((header[2] & 3) < 2 && c->media_feature != FEATURE_DVD_RW_RO)
if (c->media_feature != FEATURE_DVD_RW_RO && IN_SET(state, MEDIA_STATE_BLANK, MEDIA_STATE_APPENDABLE))
c->media_session_next = header[10] << 8 | header[5];
c->media_session_count = header[9] << 8 | header[4];
c->media_track_count = header[11] << 8 | header[6];
@ -801,6 +820,8 @@ static void print_feature(Feature feature, const char *prefix) {
}
static void print_properties(const Context *c) {
const char *state;
assert(c);
printf("ID_CDROM=1\n");
@ -847,8 +868,9 @@ static void print_properties(const Context *c) {
printf("ID_CDROM_MEDIA_BD_R=1\n");
}
if (c->media_state)
printf("ID_CDROM_MEDIA_STATE=%s\n", c->media_state);
state = media_state_to_string(c->media_state);
if (state)
printf("ID_CDROM_MEDIA_STATE=%s\n", state);
if (c->media_session_next > 0)
printf("ID_CDROM_MEDIA_SESSION_NEXT=%u\n", c->media_session_next);
if (c->media_session_count > 0)