[SCSI] sr: consider the last written sector when determining media size
On certain cases, UDF disc doesn't report capacity correctly via
READ_CAPACITY but TOC or trackinfo contains valid information which
can be obtained using cdrom_get_last_written(). ide-cd considers both
values and uses the larger one. Do the same in sr. This fixes
bko#9668.
http://bugzilla.kernel.org/show_bug.cgi?id=9668
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Milan Kocian <milan.kocian@wq.cz>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index eb61f7a..d6f340f 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -684,14 +684,20 @@
cd->capacity = 0x1fffff;
sector_size = 2048; /* A guess, just in case */
} else {
-#if 0
- if (cdrom_get_last_written(&cd->cdi,
- &cd->capacity))
-#endif
- cd->capacity = 1 + ((buffer[0] << 24) |
- (buffer[1] << 16) |
- (buffer[2] << 8) |
- buffer[3]);
+ long last_written;
+
+ cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) |
+ (buffer[2] << 8) | buffer[3]);
+ /*
+ * READ_CAPACITY doesn't return the correct size on
+ * certain UDF media. If last_written is larger, use
+ * it instead.
+ *
+ * http://bugzilla.kernel.org/show_bug.cgi?id=9668
+ */
+ if (!cdrom_get_last_written(&cd->cdi, &last_written))
+ cd->capacity = max_t(long, cd->capacity, last_written);
+
sector_size = (buffer[4] << 24) |
(buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
switch (sector_size) {