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 struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *filename); 20 int gfs2_dir_check(struct inode *dir, const struct qstr *filename, 21 const struct gfs2_inode *ip); 22 int gfs2_dir_add(struct inode *inode, const struct qstr *filename, 23 const struct gfs2_inode *ip, unsigned int type); 24 int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename); 25 int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque, 26 filldir_t filldir); 27 int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename, 28 const struct gfs2_inode *nip, unsigned int new_type); 29 30 int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip); 31 32 int gfs2_diradd_alloc_required(struct inode *dir, 33 const struct qstr *filename); 34 int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block, 35 struct buffer_head **bhp); 36 37 static inline u32 gfs2_disk_hash(const char *data, int len) 38 { 39 return crc32_le((u32)~0, data, len) ^ (u32)~0; 40 } 41 42 43 static inline void gfs2_str2qstr(struct qstr *name, const char *fname) 44 { 45 name->name = fname; 46 name->len = strlen(fname); 47 name->hash = gfs2_disk_hash(name->name, name->len); 48 } 49 50 /* N.B. This probably ought to take inum & type as args as well */ 51 static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent) 52 { 53 dent->de_inum.no_addr = cpu_to_be64(0); 54 dent->de_inum.no_formal_ino = cpu_to_be64(0); 55 dent->de_hash = cpu_to_be32(name->hash); 56 dent->de_rec_len = cpu_to_be16(reclen); 57 dent->de_name_len = cpu_to_be16(name->len); 58 dent->de_type = cpu_to_be16(0); 59 memset(dent->__pad, 0, sizeof(dent->__pad)); 60 memcpy(dent + 1, name->name, name->len); 61 } 62 63 #endif /* __DIR_DOT_H__ */ 64