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

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
...@@ -2574,6 +2574,10 @@ static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) ...@@ -2574,6 +2574,10 @@ static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
} }
mutex_unlock(&fs_devices->device_list_mutex); 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))) if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
ret = -EFAULT; ret = -EFAULT;
......
...@@ -181,7 +181,11 @@ struct btrfs_ioctl_fs_info_args { ...@@ -181,7 +181,11 @@ struct btrfs_ioctl_fs_info_args {
__u64 max_id; /* out */ __u64 max_id; /* out */
__u64 num_devices; /* out */ __u64 num_devices; /* out */
__u8 fsid[BTRFS_FSID_SIZE]; /* 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 { struct btrfs_ioctl_feature_flags {
......
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