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 #include <linux/crc32.h> 15 16 struct inode; 17 struct gfs2_inode; 18 struct gfs2_inum; 19 20 extern struct inode *gfs2_dir_search(struct inode *dir, 21 const struct qstr *filename); 22 extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename, 23 const struct gfs2_inode *ip); 24 extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename, 25 const struct gfs2_inode *ip); 26 extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry); 27 extern int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque, 28 filldir_t filldir, struct file_ra_state *f_ra); 29 extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename, 30 const struct gfs2_inode *nip, unsigned int new_type); 31 32 extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip); 33 34 extern int gfs2_diradd_alloc_required(struct inode *dir, 35 const struct qstr *filename); 36 extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block, 37 struct buffer_head **bhp); 38 extern void gfs2_dir_hash_inval(struct gfs2_inode *ip); 39 40 static inline u32 gfs2_disk_hash(const char *data, int len) 41 { 42 return crc32_le((u32)~0, data, len) ^ (u32)~0; 43 } 44 45 46 static inline void gfs2_str2qstr(struct qstr *name, const char *fname) 47 { 48 name->name = fname; 49 name->len = strlen(fname); 50 name->hash = gfs2_disk_hash(name->name, name->len); 51 } 52 53 /* N.B. This probably ought to take inum & type as args as well */ 54 static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent) 55 { 56 dent->de_inum.no_addr = cpu_to_be64(0); 57 dent->de_inum.no_formal_ino = cpu_to_be64(0); 58 dent->de_hash = cpu_to_be32(name->hash); 59 dent->de_rec_len = cpu_to_be16(reclen); 60 dent->de_name_len = cpu_to_be16(name->len); 61 dent->de_type = cpu_to_be16(0); 62 memset(dent->__pad, 0, sizeof(dent->__pad)); 63 memcpy(dent + 1, name->name, name->len); 64 } 65 66 extern struct qstr gfs2_qdot; 67 extern struct qstr gfs2_qdotdot; 68 69 #endif /* __DIR_DOT_H__ */ 70