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Commit 80a773fb authored by David Sterba's avatar David Sterba Committed by Chris Mason
Browse files

btrfs: retrieve more info from FS_INFO ioctl 



Provide the basic information about filesystem through the ioctl:
* b-tree node size (same as leaf size)
* sector size
* expected alignment of CLONE_RANGE and EXTENT_SAME ioctl arguments

Backward compatibility: if the values are 0, kernel does not provide
this information, the applications should ignore them.

Signed-off-by: default avatarDavid Sterba <dsterba@suse.cz>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 7d824b6f

fs/btrfs/ioctl.c

+4 −0
Original line number Diff line number Diff line
@@ -2574,6 +2574,10 @@ static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 
	}

	mutex_unlock(&fs_devices->device_list_mutex);



	fi_args->nodesize = root->fs_info->super_copy->nodesize;

	fi_args->sectorsize = root->fs_info->super_copy->sectorsize;

	fi_args->clone_alignment = root->fs_info->super_copy->sectorsize;



	if (copy_to_user(arg, fi_args, sizeof(*fi_args)))

		ret = -EFAULT;

include/uapi/linux/btrfs.h

+5 −1
Original line number Diff line number Diff line
@@ -181,7 +181,11 @@ struct btrfs_ioctl_fs_info_args { 
	__u64 max_id;				/* out */

	__u64 num_devices;			/* out */

	__u8 fsid[BTRFS_FSID_SIZE];		/* out */

	__u64 reserved[124];			/* pad to 1k */

	__u32 nodesize;				/* out */

	__u32 sectorsize;			/* out */

	__u32 clone_alignment;			/* out */

	__u32 reserved32;

	__u64 reserved[122];			/* pad to 1k */

};



struct btrfs_ioctl_feature_flags {