btrfs: use common file type conversion

Deduplicate the btrfs file type conversion implementation - file systems
that use the same file types as defined by POSIX do not need to define
their own versions and can use the common helper functions decared in
fs_types.h and implemented in fs_types.c

Common implementation can be found via commit:
bbe7449e2599 "fs: common implementation of file type"

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

4 files changed, 18 insertions, 20 deletions

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 6f5d07415dab..b16c13d51be0 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -203,8 +203,6 @@ struct btrfs_inode {
         struct inode vfs_inode;
 };
 
-extern unsigned char btrfs_filetype_table[];
-
 static inline struct btrfs_inode *BTRFS_I(const struct inode *inode)
 {
         return container_of(inode, struct btrfs_inode, vfs_inode);
diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index c669f250d4a0..e61947f5eb76 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -1692,7 +1692,7 @@ int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
                 name = (char *)(di + 1);
                 name_len = btrfs_stack_dir_name_len(di);
 
-                d_type = btrfs_filetype_table[di->type];
+                d_type = fs_ftype_to_dtype(di->type);
                 btrfs_disk_key_to_cpu(&location, &di->location);
 
                 over = !dir_emit(ctx, name, name_len,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 4706018d1f9e..1d81a7a78a3f 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -73,17 +73,6 @@ struct kmem_cache *btrfs_trans_handle_cachep;
 struct kmem_cache *btrfs_path_cachep;
 struct kmem_cache *btrfs_free_space_cachep;
 
-#define S_SHIFT 12
-static const unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
-        [S_IFREG >> S_SHIFT]    = BTRFS_FT_REG_FILE,
-        [S_IFDIR >> S_SHIFT]    = BTRFS_FT_DIR,
-        [S_IFCHR >> S_SHIFT]    = BTRFS_FT_CHRDEV,
-        [S_IFBLK >> S_SHIFT]    = BTRFS_FT_BLKDEV,
-        [S_IFIFO >> S_SHIFT]    = BTRFS_FT_FIFO,
-        [S_IFSOCK >> S_SHIFT]   = BTRFS_FT_SOCK,
-        [S_IFLNK >> S_SHIFT]    = BTRFS_FT_SYMLINK,
-};
-
 static int btrfs_setsize(struct inode *inode, struct iattr *attr);
 static int btrfs_truncate(struct inode *inode, bool skip_writeback);
 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent);
@@ -5797,10 +5786,6 @@ static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
         return d_splice_alias(inode, dentry);
 }
 
-unsigned char btrfs_filetype_table[] = {
-        DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
-};
-
 /*
  * All this infrastructure exists because dir_emit can fault, and we are holding
  * the tree lock when doing readdir.  For now just allocate a buffer and copy
@@ -5939,7 +5924,7 @@ again:
                 name_ptr = (char *)(entry + 1);
                 read_extent_buffer(leaf, name_ptr, (unsigned long)(di + 1),
                                    name_len);
-                put_unaligned(btrfs_filetype_table[btrfs_dir_type(leaf, di)],
+                put_unaligned(fs_ftype_to_dtype(btrfs_dir_type(leaf, di)),
                                 &entry->type);
                 btrfs_dir_item_key_to_cpu(leaf, di, &location);
                 put_unaligned(location.objectid, &entry->ino);
@@ -6344,7 +6329,20 @@ fail:
 
 static inline u8 btrfs_inode_type(struct inode *inode)
 {
-        return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
+        /*
+         * Compile-time asserts that generic FT_* types still match
+         * BTRFS_FT_* types
+         */
+        BUILD_BUG_ON(BTRFS_FT_UNKNOWN != FT_UNKNOWN);
+        BUILD_BUG_ON(BTRFS_FT_REG_FILE != FT_REG_FILE);
+        BUILD_BUG_ON(BTRFS_FT_DIR != FT_DIR);
+        BUILD_BUG_ON(BTRFS_FT_CHRDEV != FT_CHRDEV);
+        BUILD_BUG_ON(BTRFS_FT_BLKDEV != FT_BLKDEV);
+        BUILD_BUG_ON(BTRFS_FT_FIFO != FT_FIFO);
+        BUILD_BUG_ON(BTRFS_FT_SOCK != FT_SOCK);
+        BUILD_BUG_ON(BTRFS_FT_SYMLINK != FT_SYMLINK);
+
+        return fs_umode_to_ftype(inode->i_mode);
 }
 
 /*
diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
index e974f4bb5378..421239b98db2 100644
--- a/include/uapi/linux/btrfs_tree.h
+++ b/include/uapi/linux/btrfs_tree.h
@@ -307,6 +307,8 @@
  *
  * Used by:
  * struct btrfs_dir_item.type
+ *
+ * Values 0..7 must match common file type values in fs_types.h.
  */
 #define BTRFS_FT_UNKNOWN        0
 #define BTRFS_FT_REG_FILE       1