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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2009-11-26 22:46:03 -0500 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2009-12-03 18:01:04 -0500 |
| commit | e78db4dfb1355a895f7ea50133b702b55b8ed184 (patch) | |
| tree | 13052100a353857ff07dbb0a3c78fdc713e58bcb /include/linux/ata.h | |
| parent | d413ff3e2aa09a4ebef718dbc4be4356f879467f (diff) | |
| download | lwn-e78db4dfb1355a895f7ea50133b702b55b8ed184.tar.gz lwn-e78db4dfb1355a895f7ea50133b702b55b8ed184.zip | |
libata: Report zeroed read after TRIM and max discard size
Our current TRIM payload is a single sector that can accommodate 64 *
65535 blocks being unmapped. Report this value in the Block Limits
Maximum Unmap LBA count field.
If a storage device supports TRIM and the DRAT and RZAT bits are set,
report TPRZ=1 in Read Capacity(16).
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'include/linux/ata.h')
| -rw-r--r-- | include/linux/ata.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/ata.h b/include/linux/ata.h index e2595e877e44..dfa2298bf488 100644 --- a/include/linux/ata.h +++ b/include/linux/ata.h @@ -75,6 +75,7 @@ enum { ATA_ID_EIDE_DMA_TIME = 66, ATA_ID_EIDE_PIO = 67, ATA_ID_EIDE_PIO_IORDY = 68, + ATA_ID_ADDITIONAL_SUPP = 69, ATA_ID_QUEUE_DEPTH = 75, ATA_ID_MAJOR_VER = 80, ATA_ID_COMMAND_SET_1 = 82, @@ -816,6 +817,16 @@ static inline int ata_id_has_trim(const u16 *id) return 0; } +static inline int ata_id_has_zero_after_trim(const u16 *id) +{ + /* DSM supported, deterministic read, and read zero after trim set */ + if (ata_id_has_trim(id) && + (id[ATA_ID_ADDITIONAL_SUPP] & 0x4020) == 0x4020) + return 1; + + return 0; +} + static inline int ata_id_current_chs_valid(const u16 *id) { /* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command |