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