diff options
Diffstat (limited to 'Documentation/ABI/testing/sysfs-block')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block index 2da04ce6aeef..dea212db9df3 100644 --- a/Documentation/ABI/testing/sysfs-block +++ b/Documentation/ABI/testing/sysfs-block @@ -213,14 +213,8 @@ What: /sys/block/<disk>/queue/discard_zeroes_data Date: May 2011 Contact: Martin K. Petersen <martin.petersen@oracle.com> Description: - Devices that support discard functionality may return - stale or random data when a previously discarded block - is read back. This can cause problems if the filesystem - expects discarded blocks to be explicitly cleared. If a - device reports that it deterministically returns zeroes - when a discarded area is read the discard_zeroes_data - parameter will be set to one. Otherwise it will be 0 and - the result of reading a discarded area is undefined. + Will always return 0. Don't rely on any specific behavior + for discards, and don't read this file. What: /sys/block/<disk>/queue/write_same_max_bytes Date: January 2012 |