mirror of
https://github.com/torvalds/linux.git
synced 2024-11-14 16:12:02 +00:00
dbb7cae2a3
This patch cleans up the inode number handling code. The main difference is that instead of looking up the inodes using a struct gfs2_inum_host we now use just the no_addr member of this structure. The tests relating to no_formal_ino can then be done by the calling code. This has advantages in that we want to do different things in different code paths if the no_formal_ino doesn't match. In the NFS patch we want to return -ESTALE, but in the ->lookup() path, its a bug in the fs if the no_formal_ino doesn't match and thus we can withdraw in this case. In order to later fix bz #201012, we need to be able to look up an inode without knowing no_formal_ino, as the only information that is known to us is the on-disk location of the inode in question. This patch will also help us to fix bz #236099 at a later date by cleaning up a lot of the code in that area. There are no user visible changes as a result of this patch and there are no changes to the on-disk format either. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#ifndef __DIR_DOT_H__
|
|
#define __DIR_DOT_H__
|
|
|
|
#include <linux/dcache.h>
|
|
|
|
struct inode;
|
|
struct gfs2_inode;
|
|
struct gfs2_inum;
|
|
|
|
struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *filename);
|
|
int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
|
|
const struct gfs2_inode *ip);
|
|
int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
|
|
const struct gfs2_inode *ip, unsigned int type);
|
|
int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename);
|
|
int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
|
|
filldir_t filldir);
|
|
int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
|
|
const struct gfs2_inode *nip, unsigned int new_type);
|
|
|
|
int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
|
|
|
|
int gfs2_diradd_alloc_required(struct inode *dir,
|
|
const struct qstr *filename);
|
|
int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
|
|
struct buffer_head **bhp);
|
|
|
|
static inline u32 gfs2_disk_hash(const char *data, int len)
|
|
{
|
|
return crc32_le((u32)~0, data, len) ^ (u32)~0;
|
|
}
|
|
|
|
|
|
static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
|
|
{
|
|
name->name = fname;
|
|
name->len = strlen(fname);
|
|
name->hash = gfs2_disk_hash(name->name, name->len);
|
|
}
|
|
|
|
/* N.B. This probably ought to take inum & type as args as well */
|
|
static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
|
|
{
|
|
dent->de_inum.no_addr = cpu_to_be64(0);
|
|
dent->de_inum.no_formal_ino = cpu_to_be64(0);
|
|
dent->de_hash = cpu_to_be32(name->hash);
|
|
dent->de_rec_len = cpu_to_be16(reclen);
|
|
dent->de_name_len = cpu_to_be16(name->len);
|
|
dent->de_type = cpu_to_be16(0);
|
|
memset(dent->__pad, 0, sizeof(dent->__pad));
|
|
memcpy(dent + 1, name->name, name->len);
|
|
}
|
|
|
|
#endif /* __DIR_DOT_H__ */
|