On 03/29/2016 01:06 AM, Hannes Reinecke wrote: > in sd_read_capacity() the sdkp->capacity field changes its meaning: > after the call to read_capacity_XX() it carries the _unscaled_ values, > making the comparison between the original value and the new value > always false for drives with a sector size != 512. > > Signed-off-by: Hannes Reinecke <[email protected]> > --- > drivers/scsi/sd.c | 69 > +++++++++++++++++++++++++++++++------------------------ > 1 file changed, 39 insertions(+), 30 deletions(-) > > diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c > index 5a5457a..0afe113 100644 > --- a/drivers/scsi/sd.c > +++ b/drivers/scsi/sd.c > @@ -2046,7 +2046,7 @@ static void read_capacity_error(struct scsi_disk *sdkp, > struct scsi_device *sdp, > #define READ_CAPACITY_RETRIES_ON_RESET 10 > > static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, > - unsigned char *buffer) > + unsigned char *buffer, u64 *capacity) > { > unsigned char cmd[16]; > struct scsi_sense_hdr sshdr; > @@ -2054,8 +2054,8 @@ static int read_capacity_16(struct scsi_disk *sdkp, > struct scsi_device *sdp, > int the_result; > int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; > unsigned int alignment; > - unsigned long long lba; > - unsigned sector_size; > + u64 lba; > + u32 sector_size; > > if (sdp->no_read_capacity_16) > return -EINVAL; > @@ -2114,7 +2114,7 @@ static int read_capacity_16(struct scsi_disk *sdkp, > struct scsi_device *sdp, > sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " > "kernel compiled with support for large block " > "devices.\n"); > - sdkp->capacity = 0; > + *capacity = 0; > return -EOVERFLOW; > } > > @@ -2137,20 +2137,20 @@ static int read_capacity_16(struct scsi_disk *sdkp, > struct scsi_device *sdp, > sd_config_discard(sdkp, SD_LBP_WS16); > } > > - sdkp->capacity = lba + 1; > + *capacity = lba + 1; > return sector_size; > } > > static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, > - unsigned char *buffer) > + unsigned char *buffer, u64 *capacity) > { > unsigned char cmd[16]; > struct scsi_sense_hdr sshdr; > int sense_valid = 0; > int the_result; > int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; > - sector_t lba; > - unsigned sector_size; > + u32 lba; > + u32 sector_size; > > do { > cmd[0] = READ_CAPACITY; > @@ -2191,7 +2191,7 @@ static int read_capacity_10(struct scsi_disk *sdkp, > struct scsi_device *sdp, > /* Some buggy (usb cardreader) devices return an lba of > 0xffffffff when the want to report a size of 0 (with > which they really mean no media is present) */ > - sdkp->capacity = 0; > + *capacity = 0; > sdkp->physical_block_size = sector_size; > return sector_size; > } > @@ -2200,11 +2200,11 @@ static int read_capacity_10(struct scsi_disk *sdkp, > struct scsi_device *sdp, > sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " > "kernel compiled with support for large block " > "devices.\n"); > - sdkp->capacity = 0; > + *capacity = 0; > return -EOVERFLOW; > } > > - sdkp->capacity = lba + 1; > + *capacity = (u64)lba + 1; > sdkp->physical_block_size = sector_size; > return sector_size; > } > @@ -2230,34 +2230,38 @@ sd_read_capacity(struct scsi_disk *sdkp, unsigned > char *buffer) > { > int sector_size; > struct scsi_device *sdp = sdkp->device; > - sector_t old_capacity = sdkp->capacity; > + u64 old_capacity = sdkp->capacity, new_capacity; > > if (sd_try_rc16_first(sdp)) { > - sector_size = read_capacity_16(sdkp, sdp, buffer); > + sector_size = read_capacity_16(sdkp, sdp, buffer, > + &new_capacity); > if (sector_size == -EOVERFLOW) > goto got_data; > if (sector_size == -ENODEV) > return; > if (sector_size < 0) > - sector_size = read_capacity_10(sdkp, sdp, buffer); > + sector_size = read_capacity_10(sdkp, sdp, buffer, > + &new_capacity); > if (sector_size < 0) > return; > } else { > - sector_size = read_capacity_10(sdkp, sdp, buffer); > + sector_size = read_capacity_10(sdkp, sdp, buffer, > + &new_capacity); > if (sector_size == -EOVERFLOW) > goto got_data; > if (sector_size < 0) > return; > if ((sizeof(sdkp->capacity) > 4) && > - (sdkp->capacity > 0xffffffffULL)) { > + (new_capacity > 0xffffffffULL)) { > int old_sector_size = sector_size; > sd_printk(KERN_NOTICE, sdkp, "Very big device. " > "Trying to use READ CAPACITY(16).\n"); > - sector_size = read_capacity_16(sdkp, sdp, buffer); > + sector_size = read_capacity_16(sdkp, sdp, buffer, > + &new_capacity); > if (sector_size < 0) { > sd_printk(KERN_NOTICE, sdkp, > "Using 0xffffffff as device size\n"); > - sdkp->capacity = 1 + (sector_t) 0xffffffff; > + new_capacity = 1 + (u64) 0xffffffff; > sector_size = old_sector_size; > goto got_data; > } > @@ -2275,11 +2279,11 @@ sd_read_capacity(struct scsi_disk *sdkp, unsigned > char *buffer) > * the capacity. > */ > if (sdp->fix_capacity || > - (sdp->guess_capacity && (sdkp->capacity & 0x01))) { > + (sdp->guess_capacity && (new_capacity & 0x01))) { > sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " > "from its reported value: %llu\n", > - (unsigned long long) sdkp->capacity); > - --sdkp->capacity; > + (unsigned long long) new_capacity); > + --new_capacity; > } > > got_data: > @@ -2301,7 +2305,7 @@ got_data: > * would be relatively trivial to set the thing up. > * For this reason, we leave the thing in the table. > */ > - sdkp->capacity = 0; > + new_capacity = 0; > /* > * set a bogus sector size so the normal read/write > * logic in the block layer will eventually refuse any > @@ -2312,6 +2316,19 @@ got_data: > } > blk_queue_logical_block_size(sdp->request_queue, sector_size); > > + /* > + * Note: up to this point new_capacity carries the > + * _unscaled_ capacity. So rescale capacity to 512-byte units. > + */ > + if (sector_size == 4096) > + sdkp->capacity = new_capacity << 3; > + else if (sector_size == 2048) > + sdkp->capacity = new_capacity << 2; > + else if (sector_size == 1024) > + sdkp->capacity = new_capacity << 1; > + else > + sdkp->capacity = new_capacity; > + > { > char cap_str_2[10], cap_str_10[10]; > > @@ -2337,14 +2354,6 @@ got_data: > if (sdkp->capacity > 0xffffffff) > sdp->use_16_for_rw = 1; > > - /* Rescale capacity to 512-byte units */ > - if (sector_size == 4096) > - sdkp->capacity <<= 3; > - else if (sector_size == 2048) > - sdkp->capacity <<= 2; > - else if (sector_size == 1024) > - sdkp->capacity <<= 1; > - > blk_queue_physical_block_size(sdp->request_queue, > sdkp->physical_block_size); > sdkp->device->sector_size = sector_size; >
Reviewed-by: Lee Duncan <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
