From 7db1c5d14dcd521bef1780b79dcc68b3968447a9 Mon Sep 17 00:00:00 2001
From: Naohiro Aota <naohiro.aota@wdc.com>
Date: Thu, 4 Feb 2021 19:22:14 +0900
Subject: btrfs: zoned: support dev-replace in zoned filesystems
This is 4/4 patch to implement device-replace on zoned filesystems.
Even after the copying is done, the write pointers of the source device
and the destination device may not be synchronized. For example, when
the last allocated extent is freed before device-replace process, the
extent is not copied, leaving a hole there.
Synchronize the write pointers by writing zeroes to the destination
device.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
fs/btrfs/zoned.h | 9 +++++++++
1 file changed, 9 insertions(+)
(limited to 'fs/btrfs/zoned.h')
diff --git a/fs/btrfs/zoned.h b/fs/btrfs/zoned.h
index 5ed1ea2009ea..932ad9bc0de6 100644
--- a/fs/btrfs/zoned.h
+++ b/fs/btrfs/zoned.h
@@ -56,6 +56,8 @@ bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache,
struct extent_buffer *eb);
int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length);
+int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
+ u64 physical_start, u64 physical_pos);
#else /* CONFIG_BLK_DEV_ZONED */
static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
struct blk_zone *zone)
@@ -176,6 +178,13 @@ static inline int btrfs_zoned_issue_zeroout(struct btrfs_device *device,
return -EOPNOTSUPP;
}
+static inline int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev,
+ u64 logical, u64 physical_start,
+ u64 physical_pos)
+{
+ return -EOPNOTSUPP;
+}
+
#endif
static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)
--
cgit