From: Anand Jain <Anand.Jain@xxxxxxxxxx>
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>
Tested-by: Austin S. Hemmelgarn <ahferroin7@xxxxxxxxx>
---
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
--
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