usr/src/uts/common/sys/fs/pc_node.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #ifndef _SYS_FS_PC_NODE_H
  27 #define _SYS_FS_PC_NODE_H
  28
  29 #ifdef  __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 #include <vm/page.h>
  34 #include <sys/buf.h>
  35 #include <sys/vnode.h>
  36
  37 #ifdef _KERNEL
  38 #include <sys/vfs_opreg.h>
  39 #endif
  40
  41 /*
  42  * This overlays the fid structure (see vfs.h)
  43  *
  44  * 10 bytes max.
  45  */
  46 struct pc_fid {
  47         ushort_t        pcfid_len;
  48         uint32_t        pcfid_block;    /* dblock containing directory entry */
  49         uint16_t        pcfid_offset;   /* offset within block of entry */
  50         uint16_t        pcfid_ctime;    /* creation time of entry (~= i_gen) */
  51 };
  52
  53 struct pcnode {
  54         struct pcnode   *pc_forw;       /* active list ptrs, must be first */
  55         struct pcnode   *pc_back;
  56         int pc_flags;                   /* see below */
  57         struct vnode    *pc_vn;         /* vnode for pcnode */
  58         uint_t pc_size;                 /* size of file */
  59         pc_cluster32_t  pc_scluster;    /* starting cluster of file */
  60         daddr_t pc_eblkno;              /* disk blkno for entry */
  61         int pc_eoffset;                 /* offset in disk block of entry */
  62         struct pcdir pc_entry;          /* directory entry of file */
  63         pc_cluster32_t  pc_lcluster;    /* last cluster visited */
  64         daddr_t         pc_lindex;      /* index of last cluster visited */
  65 };
  66
  67 /*
  68  * flags
  69  */
  70 #define PC_MOD          0x01            /* file data has been modified */
  71 #define PC_CHG          0x02            /* node data has been changed */
  72 #define PC_INVAL        0x04            /* node is invalid */
  73 #define PC_EXTERNAL     0x08            /* vnode ref is held externally */
  74 #define PC_ACC          0x10            /* file data has been accessed */
  75 #define PC_RELEHOLD     0x80            /* node is being released */
  76
  77 #define PCTOV(PCP)      ((PCP)->pc_vn)
  78 #define VTOPC(VP)       ((struct pcnode *)((VP)->v_data))
  79
  80 /*
  81  * Make a unique integer for a file
  82  */
  83 #define pc_makenodeid(BN, OFF, ATTR, SCLUSTER, ENTPS) \
  84         (ino_t)((ATTR) & PCA_DIR ? \
  85                 (uint32_t)(-(SCLUSTER) - 1) : \
  86                 ((BN) * (ENTPS)) + ((OFF) / sizeof (struct pcdir)))
  87
  88 #define NPCHASH 1
  89
  90 #if NPCHASH == 1
  91 #define PCFHASH(FSP, BN, O)     0
  92 #define PCDHASH(FSP, SC)        0
  93 #else
  94 #define PCFHASH(FSP, BN, O)     (((unsigned)FSP + BN + O) % NPCHASH)
  95 #define PCDHASH(FSP, SC)        (((unsigned)FSP + SC) % NPCHASH)
  96 #endif
  97
  98 struct pchead {
  99         struct pcnode *pch_forw;
 100         struct pcnode *pch_back;
 101 };
 102
 103 /*
 104  * pcnode file and directory operations vectors
 105  */
 106 extern struct vnodeops *pcfs_fvnodeops;
 107 extern struct vnodeops *pcfs_dvnodeops;
 108
 109 #ifdef _KERNEL
 110 extern const struct fs_operation_def pcfs_fvnodeops_template[];
 111 extern const struct fs_operation_def pcfs_dvnodeops_template[];
 112 #endif
 113
 114 extern struct pchead pcfhead[];
 115 extern struct pchead pcdhead[];
 116
 117 /*
 118  * pcnode routines
 119  */
 120 extern void pc_init(void);
 121 extern struct pcnode *pc_getnode(struct pcfs *, daddr_t, int, struct pcdir *);
 122 extern void pc_rele(struct pcnode *);
 123 extern void pc_mark_mod(struct pcfs *, struct pcnode *);
 124 extern void pc_mark_acc(struct pcfs *, struct pcnode *);
 125 extern int pc_nodesync(struct pcnode *);
 126 extern int pc_nodeupdate(struct pcnode *);
 127 extern int pc_bmap(struct pcnode *, daddr_t, daddr_t *, uint_t *);
 128
 129 extern int pc_balloc(struct pcnode *, daddr_t, int, daddr_t *);
 130 extern int pc_bfree(struct pcnode *, pc_cluster32_t);
 131 extern int pc_verify(struct pcfs *);
 132 extern void pc_diskchanged(struct pcfs *);
 133 extern void pc_mark_irrecov(struct pcfs *);
 134
 135 extern int pc_dirlook(struct pcnode *, char *, struct pcnode **);
 136 extern int pc_direnter(struct pcnode *, char *, struct vattr *,
 137         struct pcnode **);
 138 extern int pc_dirremove(struct pcnode *, char *, struct vnode *, enum vtype,
 139                 caller_context_t *);
 140 extern int pc_rename(struct pcnode *, struct pcnode *, char *, char *,
 141                 caller_context_t *);
 142 extern int pc_blkatoff(struct pcnode *, offset_t, struct buf **,
 143         struct pcdir **);
 144 extern int pc_truncate(struct pcnode *, uint_t);
 145 extern int pc_fileclsize(struct pcfs *, pc_cluster32_t, pc_cluster32_t *);
 146 extern int pcfs_putapage(struct vnode *, page_t *, u_offset_t *, size_t *, int,
 147         struct cred *);
 148 extern void pc_badfs(struct pcfs *);
 149
 150 #ifdef  __cplusplus
 151 }
 152 #endif
 153
 154 #endif  /* _SYS_FS_PC_NODE_H */