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