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fs/gfs2/dir.h
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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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* * This copyrighted material is made available to anyone wishing to use, * 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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*/ #ifndef __DIR_DOT_H__ #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; struct gfs2_inode; struct gfs2_inum; |
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struct buffer_head; struct gfs2_dirent; |
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struct gfs2_diradd { unsigned nr_blocks; |
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struct gfs2_dirent *dent; struct buffer_head *bh; |
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int save_loc; |
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}; |
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extern struct inode *gfs2_dir_search(struct inode *dir, |
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const struct qstr *filename, bool fail_on_exist); |
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extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename, const struct gfs2_inode *ip); extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename, |
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const struct gfs2_inode *ip, struct gfs2_diradd *da); static inline void gfs2_dir_no_add(struct gfs2_diradd *da) { if (da->bh) brelse(da->bh); da->bh = NULL; } |
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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, struct dir_context *ctx, struct file_ra_state *f_ra); |
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extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename, 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, struct gfs2_diradd *da); |
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extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block, struct buffer_head **bhp); |
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extern void gfs2_dir_hash_inval(struct gfs2_inode *ip); |
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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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} 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); } |
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/* 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)); |
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memcpy(dent + 1, name->name, name->len); |
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} |
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extern struct qstr gfs2_qdot; extern struct qstr gfs2_qdotdot; |
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#endif /* __DIR_DOT_H__ */ |