Btrfs: fix the new inspection ioctls for 32 bit compat

The new ioctls to follow backrefs are not clean for 32/64 bit
compat.  This reworks them for u64s everywhere.  They are brand new, so
there are no problems with changing the interface now.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

4 files changed, 15 insertions, 16 deletions

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 2351df0de450..8855aad3929c 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -676,14 +676,14 @@ static int inode_to_path(u64 inum, struct btrfs_inode_ref *iref,
         bytes_left = ipath->fspath->bytes_left > s_ptr ?
                                         ipath->fspath->bytes_left - s_ptr : 0;
 
-        fspath_min = (char *)ipath->fspath->str + (i + 1) * s_ptr;
+        fspath_min = (char *)ipath->fspath->val + (i + 1) * s_ptr;
         fspath = iref_to_path(ipath->fs_root, ipath->btrfs_path, iref, eb,
                                 inum, fspath_min, bytes_left);
         if (IS_ERR(fspath))
                 return PTR_ERR(fspath);
 
         if (fspath > fspath_min) {
-                ipath->fspath->str[i] = fspath;
+                ipath->fspath->val[i] = (u64)fspath;
                 ++ipath->fspath->elem_cnt;
                 ipath->fspath->bytes_left = fspath - fspath_min;
         } else {
@@ -698,9 +698,9 @@ static int inode_to_path(u64 inum, struct btrfs_inode_ref *iref,
 /*
  * this dumps all file system paths to the inode into the ipath struct, provided
  * is has been created large enough. each path is zero-terminated and accessed
- * from ipath->fspath->str[i].
+ * from ipath->fspath->val[i].
  * when it returns, there are ipath->fspath->elem_cnt number of paths available
- * in ipath->fspath->str[]. when the allocated space wasn't sufficient, the
+ * in ipath->fspath->val[]. when the allocated space wasn't sufficient, the
  * number of missed paths in recored in ipath->fspath->elem_missed, otherwise,
  * it's zero. ipath->fspath->bytes_missing holds the number of bytes that would
  * have been needed to return all paths.
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index cc9893990341..4a34c472f126 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2895,7 +2895,7 @@ static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
 {
         int ret = 0;
         int i;
-        unsigned long rel_ptr;
+        u64 rel_ptr;
         int size;
         struct btrfs_ioctl_ino_path_args *ipa = NULL;
         struct inode_fs_paths *ipath = NULL;
@@ -2930,11 +2930,11 @@ static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
                 goto out;
 
         for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
-                rel_ptr = ipath->fspath->str[i] - (char *)ipath->fspath->str;
-                ipath->fspath->str[i] = (void *)rel_ptr;
+                rel_ptr = ipath->fspath->val[i] - (u64)ipath->fspath->val;
+                ipath->fspath->val[i] = rel_ptr;
         }
 
-        ret = copy_to_user(ipa->fspath, ipath->fspath, size);
+        ret = copy_to_user((void *)ipa->fspath, (void *)ipath->fspath, size);
         if (ret) {
                 ret = -EFAULT;
                 goto out;
@@ -3017,7 +3017,7 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
         if (ret < 0)
                 goto out;
 
-        ret = copy_to_user(loi->inodes, inodes, size);
+        ret = copy_to_user((void *)loi->inodes, (void *)inodes, size);
         if (ret)
                 ret = -EFAULT;
 
diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 2da30d4950e6..252ae9915de8 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -198,24 +198,23 @@ struct btrfs_data_container {
         __u32   bytes_missing;  /* out -- additional bytes needed for result */
         __u32   elem_cnt;       /* out */
         __u32   elem_missed;    /* out */
-        union {
-                char    *str[0];        /* out */
-                __u64   val[0];         /* out */
-        };
+        __u64   val[0];         /* out */
 };
 
 struct btrfs_ioctl_ino_path_args {
         __u64                           inum;           /* in */
         __u32                           size;           /* in */
         __u64                           reserved[4];
-        struct btrfs_data_container     *fspath;        /* out */
+        /* struct btrfs_data_container  *fspath;           out */
+        __u64                           fspath;         /* out */
 };
 
 struct btrfs_ioctl_logical_ino_args {
         __u64                           logical;        /* in */
         __u32                           size;           /* in */
         __u64                           reserved[4];
-        struct btrfs_data_container     *inodes;        /* out */
+        /* struct btrfs_data_container  *inodes;        out   */
+        __u64                           inodes;
 };
 
 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 94cd3a19e9c8..562dad10dee9 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -272,7 +272,7 @@ static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, void *ctx)
                         swarn->logical, swarn->dev->name,
                         (unsigned long long)swarn->sector, root, inum, offset,
                         min(isize - offset, (u64)PAGE_SIZE), nlink,
-                        ipath->fspath->str[i]);
+                        (char *)ipath->fspath->val[i]);
 
         free_ipath(ipath);
         return 0;