| | 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 | struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *filename); |
| | 21 | int gfs2_dir_check(struct inode *dir, const struct qstr *filename, |
| | 22 | const struct gfs2_inode *ip); |
| | 23 | int gfs2_dir_add(struct inode *inode, const struct qstr *filename, |
| | 24 | const struct gfs2_inode *ip, unsigned int type); |
| | 25 | int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename); |
| | 26 | int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque, |
| | 27 | filldir_t filldir); |
| | 28 | int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename, |
| | 29 | const struct gfs2_inode *nip, unsigned int new_type); |
| | 30 | |
| | 31 | int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip); |
| | 32 | |
| | 33 | int gfs2_diradd_alloc_required(struct inode *dir, |
| | 34 | const struct qstr *filename); |
| | 35 | int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block, |
| | 36 | struct buffer_head **bhp); |
| | 37 | |
| | 38 | static inline u32 gfs2_disk_hash(const char *data, int len) |
| | 39 | { |
| | 40 | return crc32_le((u32)~0, data, len) ^ (u32)~0; |
| | 41 | } |
| | 42 | |
| | 43 | |
| | 44 | static inline void gfs2_str2qstr(struct qstr *name, const char *fname) |
| | 45 | { |
| | 46 | name->name = fname; |
| | 47 | name->len = strlen(fname); |
| | 48 | name->hash = gfs2_disk_hash(name->name, name->len); |
| | 49 | } |
| | 50 | |
| | 51 | /* N.B. This probably ought to take inum & type as args as well */ |
| | 52 | static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent) |
| | 53 | { |
| | 54 | dent->de_inum.no_addr = cpu_to_be64(0); |
| | 55 | dent->de_inum.no_formal_ino = cpu_to_be64(0); |
| | 56 | dent->de_hash = cpu_to_be32(name->hash); |
| | 57 | dent->de_rec_len = cpu_to_be16(reclen); |
| | 58 | dent->de_name_len = cpu_to_be16(name->len); |
| | 59 | dent->de_type = cpu_to_be16(0); |
| | 60 | memset(dent->__pad, 0, sizeof(dent->__pad)); |
| | 61 | memcpy(dent + 1, name->name, name->len); |
| | 62 | } |
| | 63 | |
| | 64 | #endif /* __DIR_DOT_H__ */ |
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