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| 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 /fs/btrfs | |
| parent | 7d824b6f9cf28917d8a05891ef423fb0e4e34c69 (diff) | |
| download | linux-80a773fbfc2d6b5b2478377e8ac271d495f55e73.tar.gz linux-80a773fbfc2d6b5b2478377e8ac271d495f55e73.tar.bz2 linux-80a773fbfc2d6b5b2478377e8ac271d495f55e73.zip | |
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>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/ioctl.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 2f6d7b13b5bd..c6c8e3560e73 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; |