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Diffstat (limited to 'drivers/md/raid1-10.c')
| -rw-r--r-- | drivers/md/raid1-10.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c index 400001b815db1..54db341639687 100644 --- a/drivers/md/raid1-10.c +++ b/drivers/md/raid1-10.c @@ -3,12 +3,42 @@ #define RESYNC_BLOCK_SIZE (64*1024) #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) +/* + * Number of guaranteed raid bios in case of extreme VM load: + */ +#define NR_RAID_BIOS 256 + +/* when we get a read error on a read-only array, we redirect to another + * device without failing the first device, or trying to over-write to + * correct the read error. To keep track of bad blocks on a per-bio + * level, we store IO_BLOCKED in the appropriate 'bios' pointer + */ +#define IO_BLOCKED ((struct bio *)1) +/* When we successfully write to a known bad-block, we need to remove the + * bad-block marking which must be done from process context. So we record + * the success by setting devs[n].bio to IO_MADE_GOOD + */ +#define IO_MADE_GOOD ((struct bio *)2) + +#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) + +/* When there are this many requests queue to be written by + * the raid thread, we become 'congested' to provide back-pressure + * for writeback. + */ +static int max_queued_requests = 1024; + /* for managing resync I/O pages */ struct resync_pages { void *raid_bio; struct page *pages[RESYNC_PAGES]; }; +static void rbio_pool_free(void *rbio, void *data) +{ + kfree(rbio); +} + static inline int resync_alloc_pages(struct resync_pages *rp, gfp_t gfp_flags) { |