diff options
Diffstat (limited to 'drivers/md/raid5.h')
| -rw-r--r-- | drivers/md/raid5.h | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 16fc29472f5c..5c05acf20e1f 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -195,6 +195,7 @@ enum reconstruct_states { reconstruct_state_result, }; +#define DEFAULT_STRIPE_SIZE 4096 struct stripe_head { struct hlist_node hash; struct list_head lru; /* inactive_list or handle_list */ @@ -246,6 +247,13 @@ struct stripe_head { int target, target2; enum sum_check_flags zero_sum_result; } ops; + +#if PAGE_SIZE != DEFAULT_STRIPE_SIZE + /* These pages will be used by bios in dev[i] */ + struct page **pages; + int nr_pages; /* page array size */ + int stripes_per_page; +#endif struct r5dev { /* rreq and rvec are used for the replacement device when * writing data to both devices. @@ -253,6 +261,7 @@ struct stripe_head { struct bio req, rreq; struct bio_vec vec, rvec; struct page *page, *orig_page; + unsigned int offset; /* offset of the page */ struct bio *toread, *read, *towrite, *written; sector_t sector; /* sector of this page */ unsigned long flags; @@ -472,7 +481,6 @@ struct disk_info { */ #define NR_STRIPES 256 -#define DEFAULT_STRIPE_SIZE 4096 #if PAGE_SIZE == DEFAULT_STRIPE_SIZE #define STRIPE_SIZE PAGE_SIZE @@ -771,6 +779,25 @@ static inline int algorithm_is_DDF(int layout) return layout >= 8 && layout <= 10; } +#if PAGE_SIZE != DEFAULT_STRIPE_SIZE +/* + * Return offset of the corresponding page for r5dev. + */ +static inline int raid5_get_page_offset(struct stripe_head *sh, int disk_idx) +{ + return (disk_idx % sh->stripes_per_page) * RAID5_STRIPE_SIZE(sh->raid_conf); +} + +/* + * Return corresponding page address for r5dev. + */ +static inline struct page * +raid5_get_dev_page(struct stripe_head *sh, int disk_idx) +{ + return sh->pages[disk_idx / sh->stripes_per_page]; +} +#endif + extern void md_raid5_kick_device(struct r5conf *conf); extern int raid5_set_cache_size(struct mddev *mddev, int size); extern sector_t raid5_compute_blocknr(struct stripe_head *sh, int i, int previous); |