diff options
Diffstat (limited to 'drivers/md/raid5.c')
| -rw-r--r-- | drivers/md/raid5.c | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 0d403ca12ae..1cb830da54d 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -96,6 +96,16 @@ #define printk_rl(args...) ((void) (printk_ratelimit() && printk(args))) +#ifdef CONFIG_MD_RAID_SKIP_BIO_COPY +/* Define SKIP_BIO_COPY_ERR to enable work around for the issue + * SKIP_BIO_COPY malfunction when RAID degrades + */ +#define SKIP_BIO_COPY_ERR +#if defined(SKIP_BIO_COPY_ERR) +static int degraded = 0; +#endif +#endif + /* * We maintain a biased count of active stripes in the bottom 16 bits of * bi_phys_segments, and a count of processed stripes in the upper 16 bits @@ -956,6 +966,12 @@ ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) (unsigned long long)sh->sector); #ifdef CONFIG_MD_RAID_SKIP_BIO_COPY +#ifdef SKIP_BIO_COPY_ERR + if(degraded){ + fswrite = 0; + goto not_use_skip_bio; + } +#endif /* initially assume that the operation is a full-stripe write*/ for (i = disks; i-- ;) { struct r5dev *dev = &sh->dev[i]; @@ -1018,6 +1034,9 @@ do_copy: async_tx_issue_pending_all(); } #endif +#ifdef SKIP_BIO_COPY_ERR +not_use_skip_bio: +#endif for (i = disks; i--; ) { struct r5dev *dev = &sh->dev[i]; @@ -1127,7 +1146,7 @@ ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST * for the synchronous xor case */ - flags = ASYNC_TX_ACK | + flags = ASYNC_TX_FENCE | ASYNC_TX_ACK | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); atomic_inc(&sh->count); @@ -1718,6 +1737,7 @@ static void error(mddev_t *mddev, mdk_rdev_t *rdev) */ set_bit(MD_RECOVERY_INTR, &mddev->recovery); } + degraded = 1; set_bit(Faulty, &rdev->flags); printk(KERN_ALERT "raid5: Disk failure on %s, disabling device.\n" @@ -3977,6 +3997,12 @@ static int make_request(struct request_queue *q, struct bio * bi) const int rw = bio_data_dir(bi); int cpu, remaining; +#if defined(SKIP_BIO_COPY_ERR) + if(mddev->degraded) + degraded = 1; + else + degraded = 0; +#endif if (unlikely(bio_rw_flagged(bi, BIO_RW_BARRIER))) { /* Drain all pending writes. We only really need * to ensure they have been submitted, but this is @@ -5235,6 +5261,9 @@ static int stop(mddev_t *mddev) blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ free_conf(conf); mddev->private = &raid5_attrs_group; +#if defined(SKIP_BIO_COPY_ERR) + degraded = 0; +#endif return 0; } |