NODATACOW implies overwriting the file data on a device, which is
impossible in sequential required zones. Disable NODATACOW globally with
mount option and per-file NODATACOW attribute by masking FS_NOCOW_FL.
Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
---
fs/btrfs/ioctl.c | 3 +++
fs/btrfs/zoned.c | 6 ++++++
2 files changed, 9 insertions(+)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index ab408a23ba32..5d592da4e2ff 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -91,6 +91,9 @@ struct btrfs_ioctl_send_args_32 {
static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
unsigned int flags)
{
+ if (btrfs_fs_incompat(btrfs_sb(inode->i_sb), ZONED))
+ flags &= ~FS_NOCOW_FL;
+
if (S_ISDIR(inode->i_mode))
return flags;
else if (S_ISREG(inode->i_mode))
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 1629e585ba8c..6bce654bb0e8 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -284,5 +284,11 @@ int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info)
return -EOPNOTSUPP;
}
+ if (btrfs_test_opt(info, NODATACOW)) {
+ btrfs_err(info,
+ "cannot enable nodatacow with ZONED mode");
+ return -EOPNOTSUPP;
+ }
+
return 0;
}
--
2.27.0
