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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_FS_DIRENT_H#define _LINUX_FS_DIRENT_H
#include <linux/stat.h>#include <linux/types.h>
/* * This is a header for the common implementation of dirent * to fs on-disk file type conversion. Although the fs on-disk * bits are specific to every file system, in practice, many * file systems use the exact same on-disk format to describe * the lower 3 file type bits that represent the 7 POSIX file * types. * * It is important to note that the definitions in this * header MUST NOT change. This would break both the * userspace ABI and the on-disk format of filesystems * using this code. * * All those file systems can use this generic code for the * conversions. */
/* * struct dirent file types * exposed to user via getdents(2), readdir(3) * * These match bits 12..15 of stat.st_mode * (ie "(i_mode >> 12) & 15"). */#define S_DT_SHIFT 12#define S_DT(mode) (((mode) & S_IFMT) >> S_DT_SHIFT)#define S_DT_MASK (S_IFMT >> S_DT_SHIFT)
/* these are defined by POSIX and also present in glibc's dirent.h */#define DT_UNKNOWN 0#define DT_FIFO 1#define DT_CHR 2#define DT_DIR 4#define DT_BLK 6#define DT_REG 8#define DT_LNK 10#define DT_SOCK 12#define DT_WHT 14
#define DT_MAX (S_DT_MASK + 1) /* 16 */
/* * fs on-disk file types. * Only the low 3 bits are used for the POSIX file types. * Other bits are reserved for fs private use. * These definitions are shared and used by multiple filesystems, * and MUST NOT change under any circumstances. * * Note that no fs currently stores the whiteout type on-disk, * so whiteout dirents are exposed to user as DT_CHR. */#define FT_UNKNOWN 0#define FT_REG_FILE 1#define FT_DIR 2#define FT_CHRDEV 3#define FT_BLKDEV 4#define FT_FIFO 5#define FT_SOCK 6#define FT_SYMLINK 7
#define FT_MAX 8
/* * declarations for helper functions, accompanying implementation * is in fs/fs_dirent.c */extern unsigned char fs_ftype_to_dtype(unsigned int filetype);extern unsigned char fs_umode_to_ftype(umode_t mode);extern unsigned char fs_umode_to_dtype(umode_t mode);
#endif /* _LINUX_FS_DIRENT_H */