From: Anand Jain <anand.j...@oracle.com> 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 <anand.j...@oracle.com> Tested-by: Austin S. Hemmelgarn <ahferro...@gmail.com> Tested-by: Yauhen Kharuzhy <yauhen.kharu...@zavadatar.com> --- v6: update the printk for space device error to ratelimit fs/btrfs/dev-replace.c | 43 +++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/dev-replace.h | 1 + 2 files changed, 44 insertions(+) diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index 5ec7fa860391..83af64907547 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -937,3 +937,46 @@ 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, u64 src_devid) +{ + int ret; + char *tgt_path; + struct btrfs_fs_info *fs_info = root->fs_info; + + if (!src_devid) + return -EINVAL; + + if (fs_info->sb->s_flags & MS_RDONLY) + return -EROFS; + + btrfs_dev_replace_lock(&fs_info->dev_replace, 0); + if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) { + btrfs_dev_replace_unlock(&fs_info->dev_replace, 0); + return -EBUSY; + } + btrfs_dev_replace_unlock(&fs_info->dev_replace, 0); + + if (btrfs_get_spare_device(&tgt_path)) { + btrfs_info_rl(root->fs_info, + "No spare device found/configured in the kernel"); + return -EINVAL; + } + + if (atomic_xchg( + &root->fs_info->mutually_exclusive_operation_running, 1)) { + ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; + } else { + ret = btrfs_dev_replace_start(root, tgt_path, src_devid, NULL, + BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS); + atomic_set( + &root->fs_info->mutually_exclusive_operation_running, 0); + } + + if (ret) + btrfs_put_spare_device(tgt_path); + + kfree(tgt_path); + + return ret; +} diff --git a/fs/btrfs/dev-replace.h b/fs/btrfs/dev-replace.h index e922b42d91df..54b0812c8ba4 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, u64 src_devid); #endif -- 2.7.0 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html