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| author | Song Liu <songliubraving@fb.com> | 2016-11-24 09:50:39 +0300 |
|---|---|---|
| committer | Shaohua Li <shli@fb.com> | 2016-11-28 08:35:38 +0300 |
| commit | d7bd398e97f236a2353689eca5e8950f67cd34d5 (patch) | |
| tree | ed071303317acc6ba7008e808fec5845ab5fe45b /drivers/md/raid5.h | |
| parent | 034e33f5eda3c61edb838471f69ec42d64e1e94e (diff) | |
| download | linux-d7bd398e97f236a2353689eca5e8950f67cd34d5.tar.xz | |
md/r5cache: handle alloc_page failure
RMW of r5c write back cache uses an extra page to store old data for
prexor. handle_stripe_dirtying() allocates this page by calling
alloc_page(). However, alloc_page() may fail.
To handle alloc_page() failures, this patch adds an extra page to
disk_info. When alloc_page fails, handle_stripe() trys to use these
pages. When these pages are used by other stripe (R5C_EXTRA_PAGE_IN_USE),
the stripe is added to delayed_list.
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/raid5.h')
| -rw-r--r-- | drivers/md/raid5.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index d13fe45d6960..ed8e1362ab36 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -276,6 +276,7 @@ struct stripe_head_state { struct md_rdev *blocked_rdev; int handle_bad_blocks; int log_failed; + int waiting_extra_page; }; /* Flags for struct r5dev.flags */ @@ -439,6 +440,7 @@ enum { struct disk_info { struct md_rdev *rdev, *replacement; + struct page *extra_page; /* extra page to use in prexor */ }; /* @@ -559,6 +561,9 @@ enum r5_cache_state { * only process stripes that are already * occupying the log */ + R5C_EXTRA_PAGE_IN_USE, /* a stripe is using disk_info.extra_page + * for prexor + */ }; struct r5conf { @@ -765,6 +770,7 @@ extern void r5c_finish_stripe_write_out(struct r5conf *conf, struct stripe_head *sh, struct stripe_head_state *s); extern void r5c_release_extra_page(struct stripe_head *sh); +extern void r5c_use_extra_page(struct stripe_head *sh); extern void r5l_wake_reclaim(struct r5l_log *log, sector_t space); extern void r5c_handle_cached_data_endio(struct r5conf *conf, struct stripe_head *sh, int disks, struct bio_list *return_bi); |