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 struct buffer_head; 20 struct gfs2_dirent; 21 22 struct gfs2_diradd { 23 unsigned nr_blocks; 24 struct gfs2_dirent *dent; 25 struct buffer_head *bh; 26 }; 27 28 extern struct inode *gfs2_dir_search(struct inode *dir, 29 const struct qstr *filename, 30 bool fail_on_exist); 31 extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename, 32 const struct gfs2_inode *ip); 33 extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename, 34 const struct gfs2_inode *ip, struct gfs2_diradd *da); 35 static inline void gfs2_dir_no_add(struct gfs2_diradd *da) 36 { 37 if (da->bh) 38 brelse(da->bh); 39 da->bh = NULL; 40 } 41 extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry); 42 extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx, 43 struct file_ra_state *f_ra); 44 extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename, 45 const struct gfs2_inode *nip, unsigned int new_type); 46 47 extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip); 48 49 extern int gfs2_diradd_alloc_required(struct inode *dir, 50 const struct qstr *filename, 51 struct gfs2_diradd *da); 52 extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block, 53 struct buffer_head **bhp); 54 extern void gfs2_dir_hash_inval(struct gfs2_inode *ip); 55 56 static inline u32 gfs2_disk_hash(const char *data, int len) 57 { 58 return crc32_le((u32)~0, data, len) ^ (u32)~0; 59 } 60 61 62 static inline void gfs2_str2qstr(struct qstr *name, const char *fname) 63 { 64 name->name = fname; 65 name->len = strlen(fname); 66 name->hash = gfs2_disk_hash(name->name, name->len); 67 } 68 69 /* N.B. This probably ought to take inum & type as args as well */ 70 static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent) 71 { 72 dent->de_inum.no_addr = cpu_to_be64(0); 73 dent->de_inum.no_formal_ino = cpu_to_be64(0); 74 dent->de_hash = cpu_to_be32(name->hash); 75 dent->de_rec_len = cpu_to_be16(reclen); 76 dent->de_name_len = cpu_to_be16(name->len); 77 dent->de_type = cpu_to_be16(0); 78 memset(dent->__pad, 0, sizeof(dent->__pad)); 79 memcpy(dent + 1, name->name, name->len); 80 } 81 82 extern struct qstr gfs2_qdot; 83 extern struct qstr gfs2_qdotdot; 84 85 #endif /* __DIR_DOT_H__ */ 86