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md/r5cache: read data into orig_page for prexor of cached data

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With write back cache, we use orig_page to do prexor. This patch
makes sure we read data into orig_page for it.

Flag R5_OrigPageUPTDODATE is added to show whether orig_page
has the latest data from raid disk.

We introduce a helper function uptodate_for_rmw() to simplify
the a couple conditions in handle_stripe_dirtying().

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Song Liu
2017-01-12 17:22:41 -08:00
committed by Shaohua Li
parent d46d29f072
commit 86aa1397dd
3 changed files with 42 additions and 9 deletions
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5
drivers/md/raid5.h
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@@ -322,6 +322,11 @@ enum r5dev_flags {
* data and parity being written are in the journal
* device
*/
R5_OrigPageUPTDODATE, /* with write back cache, we read old data into
* dev->orig_page for prexor. When this flag is
* set, orig_page contains latest data in the
* raid disk.
*/
};
/*