cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

fs_types.h (2071B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_FS_TYPES_H
      3#define _LINUX_FS_TYPES_H
      4
      5/*
      6 * This is a header for the common implementation of dirent
      7 * to fs on-disk file type conversion.  Although the fs on-disk
      8 * bits are specific to every file system, in practice, many
      9 * file systems use the exact same on-disk format to describe
     10 * the lower 3 file type bits that represent the 7 POSIX file
     11 * types.
     12 *
     13 * It is important to note that the definitions in this
     14 * header MUST NOT change. This would break both the
     15 * userspace ABI and the on-disk format of filesystems
     16 * using this code.
     17 *
     18 * All those file systems can use this generic code for the
     19 * conversions.
     20 */
     21
     22/*
     23 * struct dirent file types
     24 * exposed to user via getdents(2), readdir(3)
     25 *
     26 * These match bits 12..15 of stat.st_mode
     27 * (ie "(i_mode >> 12) & 15").
     28 */
     29#define S_DT_SHIFT	12
     30#define S_DT(mode)	(((mode) & S_IFMT) >> S_DT_SHIFT)
     31#define S_DT_MASK	(S_IFMT >> S_DT_SHIFT)
     32
     33/* these are defined by POSIX and also present in glibc's dirent.h */
     34#define DT_UNKNOWN	0
     35#define DT_FIFO		1
     36#define DT_CHR		2
     37#define DT_DIR		4
     38#define DT_BLK		6
     39#define DT_REG		8
     40#define DT_LNK		10
     41#define DT_SOCK		12
     42#define DT_WHT		14
     43
     44#define DT_MAX		(S_DT_MASK + 1) /* 16 */
     45
     46/*
     47 * fs on-disk file types.
     48 * Only the low 3 bits are used for the POSIX file types.
     49 * Other bits are reserved for fs private use.
     50 * These definitions are shared and used by multiple filesystems,
     51 * and MUST NOT change under any circumstances.
     52 *
     53 * Note that no fs currently stores the whiteout type on-disk,
     54 * so whiteout dirents are exposed to user as DT_CHR.
     55 */
     56#define FT_UNKNOWN	0
     57#define FT_REG_FILE	1
     58#define FT_DIR		2
     59#define FT_CHRDEV	3
     60#define FT_BLKDEV	4
     61#define FT_FIFO		5
     62#define FT_SOCK		6
     63#define FT_SYMLINK	7
     64
     65#define FT_MAX		8
     66
     67/*
     68 * declarations for helper functions, accompanying implementation
     69 * is in fs/fs_types.c
     70 */
     71extern unsigned char fs_ftype_to_dtype(unsigned int filetype);
     72extern unsigned char fs_umode_to_ftype(umode_t mode);
     73extern unsigned char fs_umode_to_dtype(umode_t mode);
     74
     75#endif