Hot replace / auto replace is important volume manager feature and is critical to the data center operations, so that the degraded volume can be brought back to a healthy state at the earliest and without manual intervention.
This modifies the existing replace code to suite the need of auto replace, in the long run I hope both the codes to be merged. Signed-off-by: Anand Jain <[email protected]> --- fs/btrfs/dev-replace.c | 24 ++++++++++++++++++++++++ fs/btrfs/dev-replace.h | 1 + 2 files changed, 25 insertions(+) diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index 2b926867d136..d6b768cf121f 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -957,3 +957,27 @@ void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) &fs_info->fs_state)); } } + +int btrfs_auto_replace_start(struct btrfs_root *root, + struct btrfs_device *src_device) +{ + int ret; + char *tgt_path; + + if (btrfs_get_spare_device(&tgt_path)) { + btrfs_err(root->fs_info, + "No spare device found/configured in the kernel"); + return -EINVAL; + } + + ret = btrfs_dev_replace_start(root, tgt_path, + src_device->devid, + rcu_str_deref(src_device->name), + BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID); + if (ret) + btrfs_put_spare_device(tgt_path); + + kfree(tgt_path); + + return 0; +} diff --git a/fs/btrfs/dev-replace.h b/fs/btrfs/dev-replace.h index e922b42d91df..b918b9d6e5df 100644 --- a/fs/btrfs/dev-replace.h +++ b/fs/btrfs/dev-replace.h @@ -46,4 +46,5 @@ static inline void btrfs_dev_replace_stats_inc(atomic64_t *stat_value) { atomic64_inc(stat_value); } +int btrfs_auto_replace_start(struct btrfs_root *root, struct btrfs_device *src_device); #endif -- 2.7.0 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
