diff options
| author | David Sterba <dsterba@suse.cz> | 2014-05-07 18:17:06 +0200 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-06-09 17:20:27 -0700 |
| commit | 80a773fbfc2d6b5b2478377e8ac271d495f55e73 (patch) | |
| tree | 3e32cba85039f51ae9dc5c189dbeb5f58de04989 | |
| parent | 7d824b6f9cf28917d8a05891ef423fb0e4e34c69 (diff) | |
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: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
| -rw-r--r-- | fs/btrfs/ioctl.c | 4 | ||||
| -rw-r--r-- | include/uapi/linux/btrfs.h | 6 |
2 files changed, 9 insertions, 1 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 2f6d7b13b5b..c6c8e3560e7 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -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; diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h index 901a3c563f6..7554fd381a5 100644 --- a/include/uapi/linux/btrfs.h +++ b/include/uapi/linux/btrfs.h @@ -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 { |