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      1 /*	$NetBSD: dtfs.h,v 1.2 2010/07/14 13:09:52 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2006  Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 #ifndef DTFS_H_
     29 #define DTFS_H_
     30 
     31 #include <sys/types.h>
     32 
     33 #include <puffs.h>
     34 
     35 PUFFSOP_PROTOS(dtfs);
     36 int	dtfs_domount(struct puffs_usermount *, const char *);
     37 
     38 #define DTFS_BLOCKSHIFT	(12)
     39 #define DTFS_BLOCKSIZE	(1<<DTFS_BLOCKSHIFT)
     40 
     41 #define ROUNDUP(a,b) ((a) & ((b)-1))
     42 #define BLOCKNUM(a,b) (((a) & ~((1<<(b))-1)) >> (b))
     43 
     44 struct dtfs_fid;
     45 struct dtfs_mount {
     46 	ino_t		dtm_nextfileid;	/* running number for file id	*/
     47 
     48 	size_t		dtm_fsizes;	/* sum of file sizes in bytes	*/
     49 	fsfilcnt_t	dtm_nfiles;	/* number of files		*/
     50 
     51 	LIST_HEAD(, dtfs_poll) dtm_pollent;
     52 	int		dtm_needwakeup;
     53 	vm_prot_t	dtm_allowprot;
     54 };
     55 
     56 struct dtfs_file {
     57 	union {
     58 		struct {
     59 			uint8_t **blocks;
     60 			size_t numblocks;
     61 			size_t datalen;
     62 		} reg;
     63 		struct {
     64 			struct puffs_node *dotdot;
     65 			LIST_HEAD(, dtfs_dirent) dirents;
     66 		} dir;
     67 		struct {
     68 			char *target;
     69 		} link;
     70 	} u;
     71 #define df_blocks u.reg.blocks
     72 #define df_numblocks u.reg.numblocks
     73 #define df_datalen u.reg.datalen
     74 #define df_dotdot u.dir.dotdot
     75 #define df_dirents u.dir.dirents
     76 #define df_linktarget u.link.target
     77 };
     78 
     79 struct dtfs_dirent {
     80 	struct puffs_node *dfd_node;
     81 	struct puffs_node *dfd_parent;
     82 	char *dfd_name;
     83 	size_t dfd_namelen;
     84 
     85 	LIST_ENTRY(dtfs_dirent) dfd_entries;
     86 };
     87 
     88 struct dtfs_fid {
     89 	struct puffs_node	*dfid_addr;
     90 
     91 	/* best^Wsome-effort extra sanity check */
     92 	ino_t			dfid_fileid;
     93 	u_long			dfid_gen;
     94 };
     95 #define DTFS_FIDSIZE (sizeof(struct dtfs_fid))
     96 
     97 struct dtfs_poll {
     98 	struct puffs_cc *dp_pcc;
     99 	LIST_ENTRY(dtfs_poll) dp_entries;
    100 };
    101 
    102 struct puffs_node *	dtfs_genfile(struct puffs_node *,
    103 				     const struct puffs_cn *, enum vtype);
    104 struct dtfs_file *	dtfs_newdir(void);
    105 struct dtfs_file *	dtfs_newfile(void);
    106 struct dtfs_dirent *	dtfs_dirgetnth(struct dtfs_file *, int);
    107 struct dtfs_dirent *	dtfs_dirgetbyname(struct dtfs_file *,
    108 					  const char *, size_t);
    109 
    110 void			dtfs_nukenode(struct puffs_node *, struct puffs_node *,
    111 				      const char *, size_t);
    112 void			dtfs_freenode(struct puffs_node *);
    113 void			dtfs_setsize(struct puffs_node *, off_t);
    114 
    115 void	dtfs_adddent(struct puffs_node *, struct dtfs_dirent *);
    116 void	dtfs_removedent(struct puffs_node *, struct dtfs_dirent *);
    117 
    118 void	dtfs_baseattrs(struct vattr *, enum vtype, ino_t);
    119 void	dtfs_updatetimes(struct puffs_node *, int, int, int);
    120 
    121 bool	dtfs_isunder(struct puffs_node *, struct puffs_node *);
    122 
    123 
    124 #define DTFS_CTOF(a) ((struct dtfs_file *)(((struct puffs_node *)a)->pn_data))
    125 #define DTFS_PTOF(a) ((struct dtfs_file *)(a->pn_data))
    126 
    127 #endif /* DTFS_H_ */
    128