diff options
| -rw-r--r-- | drivers/md/raid5.c | 61 | ||||
| -rw-r--r-- | include/linux/raid/raid5.h | 2 |
2 files changed, 58 insertions, 5 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 1223e98ecd70..8cf1ae8b8a71 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -349,7 +349,7 @@ static void shrink_stripes(raid5_conf_t *conf) conf->slab_cache = NULL; } -static int raid5_end_read_request (struct bio * bi, unsigned int bytes_done, +static int raid5_end_read_request(struct bio * bi, unsigned int bytes_done, int error) { struct stripe_head *sh = bi->bi_private; @@ -401,10 +401,27 @@ static int raid5_end_read_request (struct bio * bi, unsigned int bytes_done, } #else set_bit(R5_UPTODATE, &sh->dev[i].flags); -#endif +#endif + if (test_bit(R5_ReadError, &sh->dev[i].flags)) { + printk("R5: read error corrected!!\n"); + clear_bit(R5_ReadError, &sh->dev[i].flags); + clear_bit(R5_ReWrite, &sh->dev[i].flags); + } } else { - md_error(conf->mddev, conf->disks[i].rdev); clear_bit(R5_UPTODATE, &sh->dev[i].flags); + if (conf->mddev->degraded) { + printk("R5: read error not correctable.\n"); + clear_bit(R5_ReadError, &sh->dev[i].flags); + clear_bit(R5_ReWrite, &sh->dev[i].flags); + md_error(conf->mddev, conf->disks[i].rdev); + } else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) { + /* Oh, no!!! */ + printk("R5: read error NOT corrected!!\n"); + clear_bit(R5_ReadError, &sh->dev[i].flags); + clear_bit(R5_ReWrite, &sh->dev[i].flags); + md_error(conf->mddev, conf->disks[i].rdev); + } else + set_bit(R5_ReadError, &sh->dev[i].flags); } rdev_dec_pending(conf->disks[i].rdev, conf->mddev); #if 0 @@ -966,6 +983,12 @@ static void handle_stripe(struct stripe_head *sh) if (dev->written) written++; rdev = conf->disks[i].rdev; /* FIXME, should I be looking rdev */ if (!rdev || !rdev->in_sync) { + /* The ReadError flag wil just be confusing now */ + clear_bit(R5_ReadError, &dev->flags); + clear_bit(R5_ReWrite, &dev->flags); + } + if (!rdev || !rdev->in_sync + || test_bit(R5_ReadError, &dev->flags)) { failed++; failed_num = i; } else @@ -980,6 +1003,14 @@ static void handle_stripe(struct stripe_head *sh) if (failed > 1 && to_read+to_write+written) { for (i=disks; i--; ) { int bitmap_end = 0; + + if (test_bit(R5_ReadError, &sh->dev[i].flags)) { + mdk_rdev_t *rdev = conf->disks[i].rdev; + if (rdev && rdev->in_sync) + /* multiple read failures in one stripe */ + md_error(conf->mddev, rdev); + } + spin_lock_irq(&conf->device_lock); /* fail all writes first */ bi = sh->dev[i].towrite; @@ -1015,7 +1046,8 @@ static void handle_stripe(struct stripe_head *sh) } /* fail any reads if this device is non-operational */ - if (!test_bit(R5_Insync, &sh->dev[i].flags)) { + if (!test_bit(R5_Insync, &sh->dev[i].flags) || + test_bit(R5_ReadError, &sh->dev[i].flags)) { bi = sh->dev[i].toread; sh->dev[i].toread = NULL; if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) @@ -1274,7 +1306,26 @@ static void handle_stripe(struct stripe_head *sh) md_done_sync(conf->mddev, STRIPE_SECTORS,1); clear_bit(STRIPE_SYNCING, &sh->state); } - + + /* If the failed drive is just a ReadError, then we might need to progress + * the repair/check process + */ + if (failed == 1 && test_bit(R5_ReadError, &sh->dev[failed_num].flags) + && !test_bit(R5_LOCKED, &sh->dev[failed_num].flags) + && test_bit(R5_UPTODATE, &sh->dev[failed_num].flags) + ) { + dev = &sh->dev[failed_num]; + if (!test_bit(R5_ReWrite, &dev->flags)) { + set_bit(R5_Wantwrite, &dev->flags); + set_bit(R5_ReWrite, &dev->flags); + set_bit(R5_LOCKED, &dev->flags); + } else { + /* let's read it back */ + set_bit(R5_Wantread, &dev->flags); + set_bit(R5_LOCKED, &dev->flags); + } + } + spin_unlock(&sh->lock); while ((bi=return_bi)) { diff --git a/include/linux/raid/raid5.h b/include/linux/raid/raid5.h index 176fc653c284..f025ba6fb14c 100644 --- a/include/linux/raid/raid5.h +++ b/include/linux/raid/raid5.h @@ -154,6 +154,8 @@ struct stripe_head { #define R5_Wantwrite 5 #define R5_Syncio 6 /* this io need to be accounted as resync io */ #define R5_Overlap 7 /* There is a pending overlapping request on this block */ +#define R5_ReadError 8 /* seen a read error here recently */ +#define R5_ReWrite 9 /* have tried to over-write the readerror */ /* * Write method |