btrfs: add FS_IOC_FSGETXATTR ioctl (e4202ac9) · Commits · 戴 / test

The new ioctl is an extension to the FS_IOC_GETFLAGS and adds new flags and is extensible. This patch allows to return the xflags portion of the fsxattr structure, other items have no meaning for btrfs or can be added later. The original patch was written by Chandan Jay Sharma but was incomplete and no further revision has been sent. Several cleanups were necessary to avoid confusion with other ioctls, as we have another flavor of flags. Based-on-patches-by:

Chandan Jay Sharma <chandansbg@gmail.com> Signed-off-by:

David Sterba <dsterba@suse.com>

fs/btrfs/ioctl.c

+20 −0

Original line number	Diff line number	Diff line
		@@ -370,6 +370,24 @@ static int check_xflags(unsigned int flags)
		return 0;
		}

		/*
		* Set the xflags from the internal inode flags. The remaining items of fsxattr
		* are zeroed.
		*/
		static int btrfs_ioctl_fsgetxattr(struct file file, void __user arg)
		{
		struct btrfs_inode *binode = BTRFS_I(file_inode(file));
		struct fsxattr fa;

		memset(&fa, 0, sizeof(fa));
		fa.fsx_xflags = btrfs_inode_flags_to_xflags(binode->flags);

		if (copy_to_user(arg, &fa, sizeof(fa)))
		return -EFAULT;

		return 0;
		}

		static int btrfs_ioctl_getversion(struct file file, int __user arg)
		{
		struct inode *inode = file_inode(file);
		@@ -5409,6 +5427,8 @@ long btrfs_ioctl(struct file *file, unsigned int
		return btrfs_ioctl_get_features(file, argp);
		case BTRFS_IOC_SET_FEATURES:
		return btrfs_ioctl_set_features(file, argp);
		case FS_IOC_FSGETXATTR:
		return btrfs_ioctl_fsgetxattr(file, argp);
		}

		return -ENOTTY;

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