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David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
10#ifndef __DIR_DOT_H__
11#define __DIR_DOT_H__
12
Steven Whitehousef2f7ba52006-09-05 10:39:21 -040013#include <linux/dcache.h>
Steven Whitehouseb5289682008-11-26 12:49:26 +000014#include <linux/crc32.h>
Steven Whitehousef2f7ba52006-09-05 10:39:21 -040015
16struct inode;
17struct gfs2_inode;
18struct gfs2_inum;
Steven Whitehouse2b47dad2014-01-06 12:49:43 +000019struct buffer_head;
20struct gfs2_dirent;
Steven Whitehousef2f7ba52006-09-05 10:39:21 -040021
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +000022struct gfs2_diradd {
23 unsigned nr_blocks;
Steven Whitehouse2b47dad2014-01-06 12:49:43 +000024 struct gfs2_dirent *dent;
25 struct buffer_head *bh;
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +000026};
27
Steven Whitehouse8d123582010-09-17 12:30:23 +010028extern struct inode *gfs2_dir_search(struct inode *dir,
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +010029 const struct qstr *filename,
30 bool fail_on_exist);
Steven Whitehouse8d123582010-09-17 12:30:23 +010031extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
32 const struct gfs2_inode *ip);
33extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
Steven Whitehouse2b47dad2014-01-06 12:49:43 +000034 const struct gfs2_inode *ip, struct gfs2_diradd *da);
35static inline void gfs2_dir_no_add(struct gfs2_diradd *da)
36{
37 if (da->bh)
38 brelse(da->bh);
39 da->bh = NULL;
40}
Steven Whitehouse855d23c2011-05-09 16:42:37 +010041extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
Al Virod81a8ef2013-05-16 14:14:48 -040042extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
43 struct file_ra_state *f_ra);
Steven Whitehouse8d123582010-09-17 12:30:23 +010044extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
45 const struct gfs2_inode *nip, unsigned int new_type);
David Teiglandb3b94fa2006-01-16 16:50:04 +000046
Steven Whitehouse8d123582010-09-17 12:30:23 +010047extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
David Teiglandb3b94fa2006-01-16 16:50:04 +000048
Steven Whitehouse8d123582010-09-17 12:30:23 +010049extern int gfs2_diradd_alloc_required(struct inode *dir,
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +000050 const struct qstr *filename,
51 struct gfs2_diradd *da);
Steven Whitehouse8d123582010-09-17 12:30:23 +010052extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
53 struct buffer_head **bhp);
Steven Whitehouse17d539f2011-06-15 10:29:37 +010054extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
Steven Whitehousec7526662006-03-20 12:30:04 -050055
Steven Whitehousecd915492006-09-04 12:49:07 -040056static inline u32 gfs2_disk_hash(const char *data, int len)
Steven Whitehouse71b86f52006-03-28 14:14:04 -050057{
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -040058 return crc32_le((u32)~0, data, len) ^ (u32)~0;
Steven Whitehouse71b86f52006-03-28 14:14:04 -050059}
60
61
62static 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
Steven Whitehousec7526662006-03-20 12:30:04 -050069/* N.B. This probably ought to take inum & type as args as well */
70static 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));
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -040079 memcpy(dent + 1, name->name, name->len);
Steven Whitehousec7526662006-03-20 12:30:04 -050080}
David Teiglandb3b94fa2006-01-16 16:50:04 +000081
Steven Whitehouse8d123582010-09-17 12:30:23 +010082extern struct qstr gfs2_qdot;
83extern struct qstr gfs2_qdotdot;
84
David Teiglandb3b94fa2006-01-16 16:50:04 +000085#endif /* __DIR_DOT_H__ */