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Diffstat (limited to 'Documentation/block/biodoc.rst')
| -rw-r--r-- | Documentation/block/biodoc.rst | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/Documentation/block/biodoc.rst b/Documentation/block/biodoc.rst index d6e30b680405..c8eb28401332 100644 --- a/Documentation/block/biodoc.rst +++ b/Documentation/block/biodoc.rst @@ -9,6 +9,7 @@ Notes on the Generic Block Layer Rewrite in Linux 2.5 here might still be useful. Notes Written on Jan 15, 2002: + - Jens Axboe <jens.axboe@oracle.com> - Suparna Bhattacharya <suparna@in.ibm.com> @@ -172,8 +173,8 @@ Some new queue property settings: New queue flags: - QUEUE_FLAG_CLUSTER (see 3.2.2) - QUEUE_FLAG_QUEUED (see 3.2.4) + - QUEUE_FLAG_CLUSTER (see 3.2.2) + - QUEUE_FLAG_QUEUED (see 3.2.4) ii. High-mem i/o capabilities are now considered the default @@ -478,7 +479,7 @@ With this multipage bio design: - Splitting of an i/o request across multiple devices (as in the case of lvm or raid) is achieved by cloning the bio (where the clone points to the same bi_io_vec array, but with the index and size accordingly modified) -- A linked list of bios is used as before for unrelated merges [*]_ - this +- A linked list of bios is used as before for unrelated merges [#]_ - this avoids reallocs and makes independent completions easier to handle. - Code that traverses the req list can find all the segments of a bio by using rq_for_each_segment. This handles the fact that a request @@ -489,7 +490,7 @@ With this multipage bio design: [TBD: Should preferably also have a bi_voffset and bi_vlen to avoid modifying bi_offset an len fields] -.. [*] +.. [#] unrelated merges -- a request ends up containing two or more bios that didn't originate from the same place. |