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 bool fail_on_exist); 23 extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename, 24 const struct gfs2_inode *ip); 25 extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename, 26 const struct gfs2_inode *ip); 27 extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry); 28 extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx, 29 struct file_ra_state *f_ra); 30 extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename, 31 const struct gfs2_inode *nip, unsigned int new_type); 32 33 extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip); 34 35 extern int gfs2_diradd_alloc_required(struct inode *dir, 36 const struct qstr *filename); 37 extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block, 38 struct buffer_head **bhp); 39 extern void gfs2_dir_hash_inval(struct gfs2_inode *ip); 40 41 static inline u32 gfs2_disk_hash(const char *data, int len) 42 { 43 return crc32_le((u32)~0, data, len) ^ (u32)~0; 44 } 45 46 47 static inline void gfs2_str2qstr(struct qstr *name, const char *fname) 48 { 49 name->name = fname; 50 name->len = strlen(fname); 51 name->hash = gfs2_disk_hash(name->name, name->len); 52 } 53 54 /* N.B. This probably ought to take inum & type as args as well */ 55 static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent) 56 { 57 dent->de_inum.no_addr = cpu_to_be64(0); 58 dent->de_inum.no_formal_ino = cpu_to_be64(0); 59 dent->de_hash = cpu_to_be32(name->hash); 60 dent->de_rec_len = cpu_to_be16(reclen); 61 dent->de_name_len = cpu_to_be16(name->len); 62 dent->de_type = cpu_to_be16(0); 63 memset(dent->__pad, 0, sizeof(dent->__pad)); 64 memcpy(dent + 1, name->name, name->len); 65 } 66 67 extern struct qstr gfs2_qdot; 68 extern struct qstr gfs2_qdotdot; 69 70 #endif /* __DIR_DOT_H__ */ 71