forked from Minki/linux
3d6ecb7d16
This adds an increment of the link count when we add a new directory entry, if that entry is itself a directory. This means that we no longer need separate code to perform this operation. Now that both adding and removing directory entries automatically update the parent directory's link count if required, that makes the code shorter and simpler than before. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#ifndef __DIR_DOT_H__
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#define __DIR_DOT_H__
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#include <linux/dcache.h>
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#include <linux/crc32.h>
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struct inode;
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struct gfs2_inode;
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struct gfs2_inum;
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extern struct inode *gfs2_dir_search(struct inode *dir,
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const struct qstr *filename);
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extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
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const struct gfs2_inode *ip);
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extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
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const struct gfs2_inode *ip);
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extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
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extern int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
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filldir_t filldir);
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extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
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const struct gfs2_inode *nip, unsigned int new_type);
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extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
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extern int gfs2_diradd_alloc_required(struct inode *dir,
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const struct qstr *filename);
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extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
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struct buffer_head **bhp);
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static inline u32 gfs2_disk_hash(const char *data, int len)
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{
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return crc32_le((u32)~0, data, len) ^ (u32)~0;
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}
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static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
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{
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name->name = fname;
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name->len = strlen(fname);
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name->hash = gfs2_disk_hash(name->name, name->len);
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}
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/* N.B. This probably ought to take inum & type as args as well */
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static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
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{
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dent->de_inum.no_addr = cpu_to_be64(0);
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dent->de_inum.no_formal_ino = cpu_to_be64(0);
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dent->de_hash = cpu_to_be32(name->hash);
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dent->de_rec_len = cpu_to_be16(reclen);
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dent->de_name_len = cpu_to_be16(name->len);
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dent->de_type = cpu_to_be16(0);
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memset(dent->__pad, 0, sizeof(dent->__pad));
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memcpy(dent + 1, name->name, name->len);
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}
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extern struct qstr gfs2_qdot;
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extern struct qstr gfs2_qdotdot;
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#endif /* __DIR_DOT_H__ */
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