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.jain@xxxxxxxxxx>
---
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
--
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