2 * Copyright (c) 2011-2012 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@dragonflybsd.org>
6 * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * This header file contains structures used internally by the HAMMER2
38 * implementation. See hammer2_disk.h for on-disk structures.
41 #ifndef _VFS_HAMMER2_HAMMER2_H_
42 #define _VFS_HAMMER2_HAMMER2_H_
44 #include <sys/param.h>
45 #include <sys/types.h>
46 #include <sys/kernel.h>
48 #include <sys/systm.h>
50 #include <sys/malloc.h>
51 #include <sys/mount.h>
52 #include <sys/vnode.h>
54 #include <sys/mountctl.h>
57 #include <sys/globaldata.h>
58 #include <sys/lockf.h>
60 #include <sys/queue.h>
61 #include <sys/limits.h>
63 #include <sys/signal2.h>
66 #include "hammer2_disk.h"
67 #include "hammer2_mount.h"
74 * The chain structure tracks blockref recursions all the way to
75 * the root volume. These consist of indirect blocks, inodes,
76 * and eventually the volume header.
78 * The chain structure is embedded in the hammer2_mount, hammer2_inode,
79 * and other system memory structures. The chain structure typically
80 * implements the reference count and busy flag for the larger structure.
82 * It is always possible to track a chain element all the way back to the
83 * root by following the (parent) links. (index) is a type-dependent index
84 * in the parent indicating where in the parent the chain element resides.
86 * When a blockref is added or deleted the related chain element is marked
87 * modified and all of its parents are marked SUBMODIFIED (the parent
88 * recursion can stop once we hit a node that is already marked SUBMODIFIED).
89 * A deleted chain element must remain intact until synchronized against
92 * The blockref at (parent, index) is not adjusted until the modified chain
93 * element is flushed and unmarked. Until then the child's blockref may
94 * not match the blockref at (parent, index).
96 SPLAY_HEAD(hammer2_chain_splay, hammer2_chain);
98 struct hammer2_chain {
99 struct hammer2_blockref bref;
100 struct hammer2_chain *parent; /* return chain to root */
101 struct hammer2_chain_splay shead;
102 SPLAY_ENTRY(hammer2_chain) snode;
104 struct hammer2_inode *ip;
105 struct hammer2_indblock *np;
106 struct hammer2_data *dp;
110 struct buf *bp; /* buffer cache (ro) */
111 hammer2_media_data_t *data; /* modified copy of data (rw) */
113 struct lock lk; /* lockmgr lock */
114 int index; /* index in parent */
116 u_int busy; /* soft-busy */
120 typedef struct hammer2_chain hammer2_chain_t;
122 int hammer2_chain_cmp(hammer2_chain_t *chain1, hammer2_chain_t *chain2);
123 SPLAY_PROTOTYPE(hammer2_chain_splay, hammer2_chain, snode, hammer2_chain_cmp);
125 #define HAMMER2_CHAIN_MODIFIED 0x00000001 /* this elm modified */
126 #define HAMMER2_CHAIN_SUBMODIFIED 0x00000002 /* 1+ subs modified */
127 #define HAMMER2_CHAIN_DELETED 0x00000004
128 #define HAMMER2_CHAIN_INITIAL 0x00000008 /* initial write */
131 * HAMMER2 IN-MEMORY CACHE OF MEDIA STRUCTURES
133 * There is an in-memory representation of all on-media data structure.
135 * When accessed read-only the data will be mapped to the related buffer
138 * When accessed read-write (marked modified) a kmalloc()'d copy of the
139 * is created which can then be modified. The copy is destroyed when a
140 * filesystem block is allocated to replace it.
142 * Active inodes (those with vnodes attached) will maintain the kmalloc()'d
143 * copy for both the read-only and the read-write case. The combination of
144 * (bp) and (data) determines whether (data) was allocated or not.
146 * The in-memory representation may remain cached (for example in order to
147 * placemark clustering locks) even after the related data has been
154 struct hammer2_inode {
155 struct hammer2_mount *hmp;
157 hammer2_chain_t chain;
158 struct hammer2_inode_data ip_data;
161 typedef struct hammer2_inode hammer2_inode_t;
164 * A hammer2 indirect block
166 struct hammer2_indblock {
167 hammer2_chain_t chain;
170 typedef struct hammer2_indblock hammer2_indblock_t;
172 #define np_data chain.data->npdata
175 * A hammer2 data block
177 struct hammer2_data {
178 hammer2_chain_t chain;
181 #define dp_data chain.data->buf
183 typedef struct hammer2_data hammer2_data_t;
186 * Governing mount structure for filesystem (aka vp->v_mount)
188 struct hammer2_mount {
189 struct mount *mp; /* kernel mount */
190 struct vnode *devvp; /* device vnode */
191 struct netexport export; /* nfs export */
192 int ronly; /* read-only mount */
194 struct malloc_type *minode;
198 struct malloc_type *mchain;
201 hammer2_chain_t vchain; /* anchor chain */
202 hammer2_chain_t *schain; /* super-root */
203 hammer2_chain_t *rchain; /* label-root */
204 struct hammer2_inode *iroot;
206 hammer2_volume_data_t voldata;
207 hammer2_off_t freecache[HAMMER2_MAX_RADIX];
210 typedef struct hammer2_mount hammer2_mount_t;
214 MALLOC_DECLARE(M_HAMMER2);
218 H2TOMP(struct hammer2_mount *hmp)
220 return (struct mount *) hmp->mp;
223 #define VTOI(vp) ((hammer2_inode_t *)(vp)->v_data)
224 #define ITOV(ip) ((ip)->vp)
227 struct hammer2_mount *
228 MPTOH2(struct mount *mp)
230 return (hammer2_mount_t *) mp->mnt_data;
233 extern struct vop_ops hammer2_vnode_vops;
234 extern struct vop_ops hammer2_spec_vops;
235 extern struct vop_ops hammer2_fifo_vops;
240 void hammer2_inode_lock_ex(hammer2_inode_t *ip);
241 void hammer2_inode_unlock_ex(hammer2_inode_t *ip);
242 void hammer2_inode_lock_sh(hammer2_inode_t *ip);
243 void hammer2_inode_unlock_sh(hammer2_inode_t *ip);
244 void hammer2_inode_busy(hammer2_inode_t *ip);
245 void hammer2_inode_unbusy(hammer2_inode_t *ip);
247 void hammer2_mount_exlock(hammer2_mount_t *hmp);
248 void hammer2_mount_shlock(hammer2_mount_t *hmp);
249 void hammer2_mount_unlock(hammer2_mount_t *hmp);
251 hammer2_key_t hammer2_dirhash(const unsigned char *name, size_t len);
256 struct vnode *hammer2_igetv(hammer2_inode_t *ip, int *errorp);
257 hammer2_inode_t *hammer2_inode_alloc(hammer2_mount_t *hmp, void *data);
258 void hammer2_inode_free(hammer2_inode_t *ip);
259 void hammer2_inode_ref(hammer2_inode_t *ip);
260 void hammer2_inode_drop(hammer2_inode_t *ip);
265 hammer2_chain_t *hammer2_chain_alloc(hammer2_mount_t *hmp,
266 hammer2_blockref_t *bref);
267 void hammer2_chain_free(hammer2_mount_t *hmp, hammer2_chain_t *chain);
268 void hammer2_chain_ref(hammer2_mount_t *hmp, hammer2_chain_t *chain);
269 void hammer2_chain_drop(hammer2_mount_t *hmp, hammer2_chain_t *chain);
270 int hammer2_chain_lock(hammer2_mount_t *hmp, hammer2_chain_t *chain);
271 void hammer2_chain_modify(hammer2_mount_t *hmp, hammer2_chain_t *chain);
272 void hammer2_chain_unlock(hammer2_mount_t *hmp, hammer2_chain_t *chain);
273 hammer2_chain_t *hammer2_chain_get(hammer2_mount_t *hmp,
274 hammer2_chain_t *parent, int index);
275 void hammer2_chain_put(hammer2_mount_t *hmp, hammer2_chain_t *chain);
276 hammer2_chain_t *hammer2_chain_lookup(hammer2_mount_t *hmp,
277 hammer2_chain_t **parentp, hammer2_key_t key,
279 hammer2_chain_t *hammer2_chain_next(hammer2_mount_t *hmp,
280 hammer2_chain_t **parentp,
281 hammer2_chain_t *chain,
282 hammer2_key_t key, hammer2_key_t mask);
283 hammer2_chain_t *hammer2_chain_create(hammer2_mount_t *hmp,
284 hammer2_chain_t *parent,
285 hammer2_key_t key, int keybits,
286 int type, size_t bytes);
287 void hammer2_chain_delete(hammer2_mount_t *hmp, hammer2_chain_t **parentp,
288 hammer2_chain_t *chain);
294 hammer2_off_t hammer2_freemap_alloc(hammer2_mount_t *hmp, size_t bytes);
296 #endif /* !_KERNEL */
297 #endif /* !_VFS_HAMMER2_HAMMER2_H_ */