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| author |   Martin K. Petersen <martin.petersen@oracle.com> | 2009-12-03 09:24:48 +0100 |
|---|---|---|
| committer |   Jens Axboe <jens.axboe@oracle.com> | 2009-12-03 09:24:48 +0100 |
| commit | 98262f2762f0067375f83824d81ea929e37e6bfe (patch) | |
| tree | a26618d5c305eed975501c80cb02bc0f1b6e4524 /include/linux/fs.h | |
| parent | Revert "cfq: Make use of service count to estimate the rb_key offset" (diff) | |
| download | linux-dev-98262f2762f0067375f83824d81ea929e37e6bfe.tar.xz linux-dev-98262f2762f0067375f83824d81ea929e37e6bfe.zip | |
block: Allow devices to indicate whether discarded blocks are zeroed
The discard ioctl is used by mkfs utilities to clear a block device
prior to putting metadata down. However, not all devices return zeroed
blocks after a discard. Some drives return stale data, potentially
containing old superblocks. It is therefore important to know whether
discarded blocks are properly zeroed.
Both ATA and SCSI drives have configuration bits that indicate whether
zeroes are returned after a discard operation. Implement a block level
interface that allows this information to be bubbled up the stack and
queried via a new block device ioctl.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to '')
| -rw-r--r-- | include/linux/fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 79cea8051736..891f7d642e5c 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -304,6 +304,7 @@ struct inodes_stat_t { #define BLKIOOPT _IO(0x12,121) #define BLKALIGNOFF _IO(0x12,122) #define BLKPBSZGET _IO(0x12,123) +#define BLKDISCARDZEROES _IO(0x12,124) #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ #define FIBMAP _IO(0x00,1) /* bmap access */ |