Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 105 insertions, 0 deletions

diff --git a/fs/fs_types.c b/fs/fs_types.c
new file mode 100644
index 000000000..78365e5dc
--- /dev/null
+++ b/fs/fs_types.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/fs.h>
+#include <linux/export.h>
+
+/*
+ * fs on-disk file type to dirent file type conversion
+ */
+static const unsigned char fs_dtype_by_ftype[FT_MAX] = {
+        [FT_UNKNOWN]    = DT_UNKNOWN,
+        [FT_REG_FILE]   = DT_REG,
+        [FT_DIR]        = DT_DIR,
+        [FT_CHRDEV]     = DT_CHR,
+        [FT_BLKDEV]     = DT_BLK,
+        [FT_FIFO]       = DT_FIFO,
+        [FT_SOCK]       = DT_SOCK,
+        [FT_SYMLINK]    = DT_LNK
+};
+
+/**
+ * fs_ftype_to_dtype() - fs on-disk file type to dirent type.
+ * @filetype: The on-disk file type to convert.
+ *
+ * This function converts the on-disk file type value (FT_*) to the directory
+ * entry type (DT_*).
+ *
+ * Context: Any context.
+ * Return:
+ * * DT_UNKNOWN         - Unknown type
+ * * DT_FIFO            - FIFO
+ * * DT_CHR             - Character device
+ * * DT_DIR             - Directory
+ * * DT_BLK             - Block device
+ * * DT_REG             - Regular file
+ * * DT_LNK             - Symbolic link
+ * * DT_SOCK            - Local-domain socket
+ */
+unsigned char fs_ftype_to_dtype(unsigned int filetype)
+{
+        if (filetype >= FT_MAX)
+                return DT_UNKNOWN;
+
+        return fs_dtype_by_ftype[filetype];
+}
+EXPORT_SYMBOL_GPL(fs_ftype_to_dtype);
+
+/*
+ * dirent file type to fs on-disk file type conversion
+ * Values not initialized explicitly are FT_UNKNOWN (0).
+ */
+static const unsigned char fs_ftype_by_dtype[DT_MAX] = {
+        [DT_REG]        = FT_REG_FILE,
+        [DT_DIR]        = FT_DIR,
+        [DT_LNK]        = FT_SYMLINK,
+        [DT_CHR]        = FT_CHRDEV,
+        [DT_BLK]        = FT_BLKDEV,
+        [DT_FIFO]       = FT_FIFO,
+        [DT_SOCK]       = FT_SOCK,
+};
+
+/**
+ * fs_umode_to_ftype() - file mode to on-disk file type.
+ * @mode: The file mode to convert.
+ *
+ * This function converts the file mode value to the on-disk file type (FT_*).
+ *
+ * Context: Any context.
+ * Return:
+ * * FT_UNKNOWN         - Unknown type
+ * * FT_REG_FILE        - Regular file
+ * * FT_DIR             - Directory
+ * * FT_CHRDEV          - Character device
+ * * FT_BLKDEV          - Block device
+ * * FT_FIFO            - FIFO
+ * * FT_SOCK            - Local-domain socket
+ * * FT_SYMLINK         - Symbolic link
+ */
+unsigned char fs_umode_to_ftype(umode_t mode)
+{
+        return fs_ftype_by_dtype[S_DT(mode)];
+}
+EXPORT_SYMBOL_GPL(fs_umode_to_ftype);
+
+/**
+ * fs_umode_to_dtype() - file mode to dirent file type.
+ * @mode: The file mode to convert.
+ *
+ * This function converts the file mode value to the directory
+ * entry type (DT_*).
+ *
+ * Context: Any context.
+ * Return:
+ * * DT_UNKNOWN         - Unknown type
+ * * DT_FIFO            - FIFO
+ * * DT_CHR             - Character device
+ * * DT_DIR             - Directory
+ * * DT_BLK             - Block device
+ * * DT_REG             - Regular file
+ * * DT_LNK             - Symbolic link
+ * * DT_SOCK            - Local-domain socket
+ */
+unsigned char fs_umode_to_dtype(umode_t mode)
+{
+        return fs_ftype_to_dtype(fs_umode_to_ftype(mode));
+}
+EXPORT_SYMBOL_GPL(fs_umode_to_dtype);