diff options
Diffstat (limited to 'Documentation/block')
| -rw-r--r-- | Documentation/block/biodoc.txt | 4 | ||||
| -rw-r--r-- | Documentation/block/queue-sysfs.txt | 18 |
2 files changed, 20 insertions, 2 deletions
diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt index 026d13362aca..bcdb2b4c1f12 100644 --- a/Documentation/block/biodoc.txt +++ b/Documentation/block/biodoc.txt @@ -269,7 +269,7 @@ Arjan's proposed request priority scheme allows higher levels some broad requests which haven't aged too much on the queue. Potentially this priority could even be exposed to applications in some manner, providing higher level tunability. Time based aging avoids starvation of lower priority - requests. Some bits in the bi_rw flags field in the bio structure are + requests. Some bits in the bi_opf flags field in the bio structure are intended to be used for this priority information. @@ -432,7 +432,7 @@ struct bio { struct bio *bi_next; /* request queue link */ struct block_device *bi_bdev; /* target device */ unsigned long bi_flags; /* status, command, etc */ - unsigned long bi_rw; /* low bits: r/w, high: priority */ + unsigned long bi_opf; /* low bits: r/w, high: priority */ unsigned int bi_vcnt; /* how may bio_vec's */ struct bvec_iter bi_iter; /* current index into bio_vec array */ diff --git a/Documentation/block/queue-sysfs.txt b/Documentation/block/queue-sysfs.txt index d515d58962b9..2a3904030dea 100644 --- a/Documentation/block/queue-sysfs.txt +++ b/Documentation/block/queue-sysfs.txt @@ -14,6 +14,12 @@ add_random (RW) This file allows to turn off the disk entropy contribution. Default value of this file is '1'(on). +dax (RO) +-------- +This file indicates whether the device supports Direct Access (DAX), +used by CPU-addressable storage to bypass the pagecache. It shows '1' +if true, '0' if not. + discard_granularity (RO) ----------------------- This shows the size of internal allocation of the device in bytes, if @@ -46,6 +52,12 @@ hw_sector_size (RO) ------------------- This is the hardware sector size of the device, in bytes. +io_poll (RW) +------------ +When read, this file shows the total number of block IO polls and how +many returned success. Writing '0' to this file will disable polling +for this device. Writing any non-zero value will enable this feature. + iostats (RW) ------------- This file is used to control (on/off) the iostats accounting of the @@ -151,5 +163,11 @@ device state. This means that it might not be safe to toggle the setting from "write back" to "write through", since that will also eliminate cache flushes issued by the kernel. +write_same_max_bytes (RO) +------------------------- +This is the number of bytes the device can write in a single write-same +command. A value of '0' means write-same is not supported by this +device. + Jens Axboe <jens.axboe@oracle.com>, February 2009 |