1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 5 */ 6 7 #ifndef __DIR_DOT_H__ 8 #define __DIR_DOT_H__ 9 10 #include <linux/dcache.h> 11 #include <linux/crc32.h> 12 13 struct inode; 14 struct gfs2_inode; 15 struct gfs2_inum; 16 struct buffer_head; 17 struct gfs2_dirent; 18 19 struct gfs2_diradd { 20 unsigned nr_blocks; 21 struct gfs2_dirent *dent; 22 struct buffer_head *bh; 23 int save_loc; 24 }; 25 26 extern struct inode *gfs2_dir_search(struct inode *dir, 27 const struct qstr *filename, 28 bool fail_on_exist); 29 extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename, 30 const struct gfs2_inode *ip); 31 extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename, 32 const struct gfs2_inode *ip, struct gfs2_diradd *da); 33 static inline void gfs2_dir_no_add(struct gfs2_diradd *da) 34 { 35 if (da->bh) 36 brelse(da->bh); 37 da->bh = NULL; 38 } 39 extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry); 40 extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx, 41 struct file_ra_state *f_ra); 42 extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename, 43 const struct gfs2_inode *nip, unsigned int new_type); 44 45 extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip); 46 47 extern int gfs2_diradd_alloc_required(struct inode *dir, 48 const struct qstr *filename, 49 struct gfs2_diradd *da); 50 extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block, 51 struct buffer_head **bhp); 52 extern void gfs2_dir_hash_inval(struct gfs2_inode *ip); 53 54 static inline u32 gfs2_disk_hash(const char *data, int len) 55 { 56 return crc32_le((u32)~0, data, len) ^ (u32)~0; 57 } 58 59 60 static inline void gfs2_str2qstr(struct qstr *name, const char *fname) 61 { 62 name->name = fname; 63 name->len = strlen(fname); 64 name->hash = gfs2_disk_hash(name->name, name->len); 65 } 66 67 /* N.B. This probably ought to take inum & type as args as well */ 68 static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent) 69 { 70 dent->de_inum.no_addr = cpu_to_be64(0); 71 dent->de_inum.no_formal_ino = cpu_to_be64(0); 72 dent->de_hash = cpu_to_be32(name->hash); 73 dent->de_rec_len = cpu_to_be16(reclen); 74 dent->de_name_len = cpu_to_be16(name->len); 75 dent->de_type = cpu_to_be16(0); 76 memset(dent->__pad, 0, sizeof(dent->__pad)); 77 memcpy(dent + 1, name->name, name->len); 78 } 79 80 extern struct qstr gfs2_qdot; 81 extern struct qstr gfs2_qdotdot; 82 83 #endif /* __DIR_DOT_H__ */ 84