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

dir.h (2520B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
      4 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
      5 */
      6
      7#ifndef __DIR_DOT_H__
      8#define __DIR_DOT_H__
      9
     10#include <linux/dcache.h>
     11#include <linux/crc32.h>
     12
     13struct inode;
     14struct gfs2_inode;
     15struct gfs2_inum;
     16struct buffer_head;
     17struct gfs2_dirent;
     18
     19struct gfs2_diradd {
     20	unsigned nr_blocks;
     21	struct gfs2_dirent *dent;
     22	struct buffer_head *bh;
     23	int save_loc;
     24};
     25
     26extern struct inode *gfs2_dir_search(struct inode *dir,
     27				     const struct qstr *filename,
     28				     bool fail_on_exist);
     29extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
     30			  const struct gfs2_inode *ip);
     31extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
     32			const struct gfs2_inode *ip, struct gfs2_diradd *da);
     33static inline void gfs2_dir_no_add(struct gfs2_diradd *da)
     34{
     35	brelse(da->bh);
     36	da->bh = NULL;
     37}
     38extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
     39extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
     40			 struct file_ra_state *f_ra);
     41extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
     42			  const struct gfs2_inode *nip, unsigned int new_type);
     43
     44extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
     45
     46extern int gfs2_diradd_alloc_required(struct inode *dir,
     47				      const struct qstr *filename,
     48				      struct gfs2_diradd *da);
     49extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
     50				   struct buffer_head **bhp);
     51extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
     52
     53static inline u32 gfs2_disk_hash(const char *data, int len)
     54{
     55        return crc32_le((u32)~0, data, len) ^ (u32)~0;
     56}
     57
     58
     59static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
     60{
     61	name->name = fname;
     62	name->len = strlen(fname);
     63	name->hash = gfs2_disk_hash(name->name, name->len);
     64}
     65
     66/* N.B. This probably ought to take inum & type as args as well */
     67static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
     68{
     69	dent->de_inum.no_addr = cpu_to_be64(0);
     70	dent->de_inum.no_formal_ino = cpu_to_be64(0);
     71	dent->de_hash = cpu_to_be32(name->hash);
     72	dent->de_rec_len = cpu_to_be16(reclen);
     73	dent->de_name_len = cpu_to_be16(name->len);
     74	dent->de_type = cpu_to_be16(0);
     75	memset(dent->__pad, 0, sizeof(dent->__pad));
     76	memcpy(dent + 1, name->name, name->len);
     77}
     78
     79extern struct qstr gfs2_qdot;
     80extern struct qstr gfs2_qdotdot;
     81
     82#endif /* __DIR_DOT_H__ */