1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #ifndef __DIR_DOT_H__ 11 #define __DIR_DOT_H__ 12 13 #include <linux/dcache.h> 14 15 struct inode; 16 struct gfs2_inode; 17 struct gfs2_inum; 18 19 int gfs2_dir_search(struct inode *dir, const struct qstr *filename, 20 struct gfs2_inum_host *inum, unsigned int *type); 21 int gfs2_dir_add(struct inode *inode, const struct qstr *filename, 22 const struct gfs2_inum_host *inum, unsigned int type); 23 int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename); 24 int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque, 25 filldir_t filldir); 26 int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename, 27 struct gfs2_inum_host *new_inum, unsigned int new_type); 28 29 int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip); 30 31 int gfs2_diradd_alloc_required(struct inode *dir, 32 const struct qstr *filename); 33 int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block, 34 struct buffer_head **bhp); 35 36 static inline u32 gfs2_disk_hash(const char *data, int len) 37 { 38 return crc32_le((u32)~0, data, len) ^ (u32)~0; 39 } 40 41 42 static inline void gfs2_str2qstr(struct qstr *name, const char *fname) 43 { 44 name->name = fname; 45 name->len = strlen(fname); 46 name->hash = gfs2_disk_hash(name->name, name->len); 47 } 48 49 /* N.B. This probably ought to take inum & type as args as well */ 50 static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent) 51 { 52 dent->de_inum.no_addr = cpu_to_be64(0); 53 dent->de_inum.no_formal_ino = cpu_to_be64(0); 54 dent->de_hash = cpu_to_be32(name->hash); 55 dent->de_rec_len = cpu_to_be16(reclen); 56 dent->de_name_len = cpu_to_be16(name->len); 57 dent->de_type = cpu_to_be16(0); 58 memset(dent->__pad, 0, sizeof(dent->__pad)); 59 memcpy(dent + 1, name->name, name->len); 60 } 61 62 #endif /* __DIR_DOT_H__ */ 63