Add an ioctl to set 'nodatacow' flag on per file basis.
Signed-off-by: Amit Gud <g...@ksu.edu>
Index: newformat2/fs/btrfs/ioctl.h
===================================================================
--- newformat2.orig/fs/btrfs/ioctl.h
+++ newformat2/fs/btrfs/ioctl.h
@@ -67,5 +67,7 @@ struct btrfs_ioctl_clone_range_args {
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_COMPRESS _IOW(BTRFS_IOCTL_MAGIC, 15, \
struct btrfs_ioctl_vol_args)
+#define BTRFS_IOC_NODATACOW _IOW(BTRFS_IOCTL_MAGIC, 16, \
+ struct btrfs_ioctl_vol_args)
#endif
Index: newformat2/fs/btrfs/ioctl.c
===================================================================
--- newformat2.orig/fs/btrfs/ioctl.c
+++ newformat2/fs/btrfs/ioctl.c
@@ -1328,6 +1328,8 @@ long btrfs_ioctl(struct file *file, unsi
return 0;
case BTRFS_IOC_COMPRESS:
return btrfs_ioctl_inode_flag(file, BTRFS_INODE_NOCOMPRESS, 0);
+ case BTRFS_IOC_NODATACOW:
+ return btrfs_ioctl_inode_flag(file, BTRFS_INODE_NODATACOW, 1);
}
return -ENOTTY;
--
May the source be with you.
http://www.cis.ksu.edu/~gud
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