forked from mirrors/linux
bbe7449e25
Many file systems use a copy&paste implementation of dirent to on-disk file type conversions. Create a common implementation to be used by file systems with some useful conversion helpers to reduce open coded file type conversions in file system code. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Phillip Potter <phil@philpotter.co.uk> Signed-off-by: Jan Kara <jack@suse.cz>
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/fs.h>
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#include <linux/export.h>
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/*
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* fs on-disk file type to dirent file type conversion
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*/
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static const unsigned char fs_dtype_by_ftype[FT_MAX] = {
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[FT_UNKNOWN] = DT_UNKNOWN,
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[FT_REG_FILE] = DT_REG,
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[FT_DIR] = DT_DIR,
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[FT_CHRDEV] = DT_CHR,
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[FT_BLKDEV] = DT_BLK,
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[FT_FIFO] = DT_FIFO,
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[FT_SOCK] = DT_SOCK,
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[FT_SYMLINK] = DT_LNK
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};
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/**
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* fs_ftype_to_dtype() - fs on-disk file type to dirent type.
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* @filetype: The on-disk file type to convert.
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*
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* This function converts the on-disk file type value (FT_*) to the directory
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* entry type (DT_*).
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*
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* Context: Any context.
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* Return:
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* * DT_UNKNOWN - Unknown type
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* * DT_FIFO - FIFO
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* * DT_CHR - Character device
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* * DT_DIR - Directory
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* * DT_BLK - Block device
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* * DT_REG - Regular file
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* * DT_LNK - Symbolic link
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* * DT_SOCK - Local-domain socket
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*/
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unsigned char fs_ftype_to_dtype(unsigned int filetype)
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{
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if (filetype >= FT_MAX)
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return DT_UNKNOWN;
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return fs_dtype_by_ftype[filetype];
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}
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EXPORT_SYMBOL_GPL(fs_ftype_to_dtype);
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/*
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* dirent file type to fs on-disk file type conversion
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* Values not initialized explicitly are FT_UNKNOWN (0).
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*/
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static const unsigned char fs_ftype_by_dtype[DT_MAX] = {
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[DT_REG] = FT_REG_FILE,
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[DT_DIR] = FT_DIR,
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[DT_LNK] = FT_SYMLINK,
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[DT_CHR] = FT_CHRDEV,
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[DT_BLK] = FT_BLKDEV,
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[DT_FIFO] = FT_FIFO,
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[DT_SOCK] = FT_SOCK,
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};
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/**
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* fs_umode_to_ftype() - file mode to on-disk file type.
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* @mode: The file mode to convert.
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*
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* This function converts the file mode value to the on-disk file type (FT_*).
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*
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* Context: Any context.
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* Return:
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* * FT_UNKNOWN - Unknown type
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* * FT_REG_FILE - Regular file
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* * FT_DIR - Directory
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* * FT_CHRDEV - Character device
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* * FT_BLKDEV - Block device
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* * FT_FIFO - FIFO
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* * FT_SOCK - Local-domain socket
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* * FT_SYMLINK - Symbolic link
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*/
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unsigned char fs_umode_to_ftype(umode_t mode)
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{
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return fs_ftype_by_dtype[S_DT(mode)];
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}
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EXPORT_SYMBOL_GPL(fs_umode_to_ftype);
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/**
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* fs_umode_to_dtype() - file mode to dirent file type.
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* @mode: The file mode to convert.
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*
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* This function converts the file mode value to the directory
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* entry type (DT_*).
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*
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* Context: Any context.
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* Return:
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* * DT_UNKNOWN - Unknown type
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* * DT_FIFO - FIFO
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* * DT_CHR - Character device
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* * DT_DIR - Directory
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* * DT_BLK - Block device
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* * DT_REG - Regular file
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* * DT_LNK - Symbolic link
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* * DT_SOCK - Local-domain socket
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*/
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unsigned char fs_umode_to_dtype(umode_t mode)
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{
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return fs_ftype_to_dtype(fs_umode_to_ftype(mode));
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}
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EXPORT_SYMBOL_GPL(fs_umode_to_dtype);
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