xfs: replace xfs_mode_to_ftype table with switch statement

commit 1fc4d33fed124fb182e8e6c214e973a29389ae83.

The size of the xfs_mode_to_ftype[] conversion table
was too small to handle an invalid value of mode=S_IFMT.

Instead of fixing the table size, replace the conversion table
with a conversion helper that uses a switch statement.

Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 25 insertions, 18 deletions

diff --git a/fs/xfs/libxfs/xfs_dir2.c b/fs/xfs/libxfs/xfs_dir2.c
index ec326d272efb..1a978bd9d506 100644
--- a/fs/xfs/libxfs/xfs_dir2.c
+++ b/fs/xfs/libxfs/xfs_dir2.c
@@ -36,21 +36,29 @@
 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
 
 /*
- * @mode, if set, indicates that the type field needs to be set up.
- * This uses the transformation from file mode to DT_* as defined in linux/fs.h
- * for file type specification. This will be propagated into the directory
- * structure if appropriate for the given operation and filesystem config.
+ * Convert inode mode to directory entry filetype
  */
-const unsigned char xfs_mode_to_ftype[S_IFMT >> S_SHIFT] = {
-        [0]                     = XFS_DIR3_FT_UNKNOWN,
-        [S_IFREG >> S_SHIFT]    = XFS_DIR3_FT_REG_FILE,
-        [S_IFDIR >> S_SHIFT]    = XFS_DIR3_FT_DIR,
-        [S_IFCHR >> S_SHIFT]    = XFS_DIR3_FT_CHRDEV,
-        [S_IFBLK >> S_SHIFT]    = XFS_DIR3_FT_BLKDEV,
-        [S_IFIFO >> S_SHIFT]    = XFS_DIR3_FT_FIFO,
-        [S_IFSOCK >> S_SHIFT]   = XFS_DIR3_FT_SOCK,
-        [S_IFLNK >> S_SHIFT]    = XFS_DIR3_FT_SYMLINK,
-};
+const unsigned char xfs_mode_to_ftype(int mode)
+{
+        switch (mode & S_IFMT) {
+        case S_IFREG:
+                return XFS_DIR3_FT_REG_FILE;
+        case S_IFDIR:
+                return XFS_DIR3_FT_DIR;
+        case S_IFCHR:
+                return XFS_DIR3_FT_CHRDEV;
+        case S_IFBLK:
+                return XFS_DIR3_FT_BLKDEV;
+        case S_IFIFO:
+                return XFS_DIR3_FT_FIFO;
+        case S_IFSOCK:
+                return XFS_DIR3_FT_SOCK;
+        case S_IFLNK:
+                return XFS_DIR3_FT_SYMLINK;
+        default:
+                return XFS_DIR3_FT_UNKNOWN;
+        }
+}
 
 /*
  * ASCII case-insensitive (ie. A-Z) support for directories that was
diff --git a/fs/xfs/libxfs/xfs_dir2.h b/fs/xfs/libxfs/xfs_dir2.h
index 6a3fe31d4bc2..0051a34b8c3f 100644
--- a/fs/xfs/libxfs/xfs_dir2.h
+++ b/fs/xfs/libxfs/xfs_dir2.h
@@ -35,10 +35,9 @@ struct xfs_dir2_data_unused;
 extern struct xfs_name  xfs_name_dotdot;
 
 /*
- * directory filetype conversion tables.
+ * Convert inode mode to directory entry filetype
  */
-#define S_SHIFT 12
-extern const unsigned char xfs_mode_to_ftype[];
+extern const unsigned char xfs_mode_to_ftype(int mode);
 
 /*
  * directory operations vector for encode/decode routines
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 405a65cd9d6b..1abe71918734 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -103,7 +103,7 @@ xfs_dentry_to_name(
 {
         namep->name = dentry->d_name.name;
         namep->len = dentry->d_name.len;
-        namep->type = xfs_mode_to_ftype[(mode & S_IFMT) >> S_SHIFT];
+        namep->type = xfs_mode_to_ftype(mode);
 }
 
 STATIC void