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| author | Song Liu <songliubraving@fb.com> | 2017-01-13 02:22:41 +0100 |
|---|---|---|
| committer | Shaohua Li <shli@fb.com> | 2017-01-24 20:20:14 +0100 |
| commit | 86aa1397ddfde563b3692adadb8b8e32e97b4e5e (patch) | |
| tree | 866e94b5411650b70561ea663ce3680a6d4a364f /drivers/md/raid5.h | |
| parent | md/raid5-cache: delete meaningless code (diff) | |
| download | linux-86aa1397ddfde563b3692adadb8b8e32e97b4e5e.tar.xz linux-86aa1397ddfde563b3692adadb8b8e32e97b4e5e.zip | |
md/r5cache: read data into orig_page for prexor of cached data
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>
Diffstat (limited to 'drivers/md/raid5.h')
| -rw-r--r-- | drivers/md/raid5.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index ed8e1362ab36..461df197d157 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -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. + */ }; /* |