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libata: Safely overwrite attached page in WRITE SAME xlat

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Safely overwriting the attached page to ATA format from the SCSI formatted
variant.

Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Shaun Tancheff
2016-08-21 23:23:18 -05:00
committed by Tejun Heo
parent cd27396e61
commit 9379e6b8e0
2 changed files with 51 additions and 31 deletions
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26
include/linux/ata.h
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@@ -1071,32 +1071,6 @@ static inline void ata_id_to_hd_driveid(u16 *id)
#endif
}
/*
* Write LBA Range Entries to the buffer that will cover the extent from
* sector to sector + count. This is used for TRIM and for ADD LBA(S)
* TO NV CACHE PINNED SET.
*/
static inline unsigned ata_set_lba_range_entries(void *_buffer,
unsigned num, u64 sector, unsigned long count)
{
__le64 *buffer = _buffer;
unsigned i = 0, used_bytes;
while (i < num) {
u64 entry = sector |
((u64)(count > 0xffff ? 0xffff : count) << 48);
buffer[i++] = __cpu_to_le64(entry);
if (count <= 0xffff)
break;
count -= 0xffff;
sector += 0xffff;
}
used_bytes = ALIGN(i * 8, 512);
memset(buffer + i, 0, used_bytes - i * 8);
return used_bytes;
}
static inline bool ata_ok(u8 status)
{
return ((status & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ | ATA_ERR))