2 * Copyright (c) 2011-2014 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
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16 * the documentation and/or other materials provided with the
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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
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32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * HAMMER2 IN-MEMORY CACHE OF MEDIA STRUCTURES
39 * This header file contains structures used internally by the HAMMER2
40 * implementation. See hammer2_disk.h for on-disk structures.
42 * There is an in-memory representation of all on-media data structure.
43 * Basically everything is represented by a hammer2_chain structure
44 * in-memory and other higher-level structures map to chains.
46 * A great deal of data is accessed simply via its buffer cache buffer,
47 * which is mapped for the duration of the chain's lock. However, because
48 * chains may represent blocks smaller than the 16KB minimum we impose
49 * on buffer cache buffers, we cannot hold related buffer cache buffers
50 * locked for smaller blocks. In these situations we kmalloc() a copy
53 * When modifications are made to a chain a new filesystem block must be
54 * allocated. Multiple modifications do not necessarily allocate new
55 * blocks. However, when a flush occurs a flush synchronization point
56 * is created and any new modifications made after this point will allocate
57 * a new block even if the chain is already in a modified state.
59 * The in-memory representation may remain cached (for example in order to
60 * placemark clustering locks) even after the related data has been
65 * In order to support concurrent flushes a flush synchronization point
66 * is created represented by a transaction id. Among other things,
67 * operations may move filesystem objects from one part of the topology
68 * to another (for example, if you rename a file or when indirect blocks
69 * are created or destroyed, and a few other things). When this occurs
70 * across a flush synchronization point the flusher needs to be able to
71 * recurse down BOTH the 'before' version of the topology and the 'after'
74 * To facilitate this modifications to chains do what is called a
75 * DELETE-DUPLICATE operation. Chains are not actually moved in-memory.
76 * Instead the chain we wish to move is deleted and a new chain is created
77 * at the target location in the topology. ANY SUBCHAINS PLACED UNDER THE
78 * CHAIN BEING MOVED HAVE TO EXIST IN BOTH PLACES. To make this work
79 * all sub-chains are managed by the hammer2_chain_core structure. This
80 * structure can be multi-homed, meaning that it can have more than one
81 * chain as its parent. When a chain is delete-duplicated the chain's core
82 * becomes shared under both the old and new chain.
86 * When a chain is delete-duplicated the old chain typically becomes stale.
87 * This is detected via the HAMMER2_CHAIN_DUPLICATED flag in chain->flags.
88 * To avoid executing live filesystem operations on stale chains, the inode
89 * locking code will follow stale chains via core->ownerq until it finds
90 * the live chain. The lock prevents ripups by other threads. Lookups
91 * must properly order locking operations to prevent other threads from
92 * racing the lookup operation and will also follow stale chains when
96 #ifndef _VFS_HAMMER2_HAMMER2_H_
97 #define _VFS_HAMMER2_HAMMER2_H_
99 #include <sys/param.h>
100 #include <sys/types.h>
101 #include <sys/kernel.h>
102 #include <sys/conf.h>
103 #include <sys/systm.h>
104 #include <sys/tree.h>
105 #include <sys/malloc.h>
106 #include <sys/mount.h>
107 #include <sys/vnode.h>
108 #include <sys/proc.h>
109 #include <sys/mountctl.h>
110 #include <sys/priv.h>
111 #include <sys/stat.h>
112 #include <sys/thread.h>
113 #include <sys/globaldata.h>
114 #include <sys/lockf.h>
116 #include <sys/queue.h>
117 #include <sys/limits.h>
118 #include <sys/signal2.h>
119 #include <sys/dmsg.h>
120 #include <sys/mutex.h>
121 #include <sys/kern_syscall.h>
123 #include <sys/buf2.h>
124 #include <sys/mutex2.h>
126 #include "hammer2_disk.h"
127 #include "hammer2_mount.h"
128 #include "hammer2_ioctl.h"
129 #include "hammer2_ccms.h"
131 struct hammer2_chain;
132 struct hammer2_cluster;
133 struct hammer2_inode;
134 struct hammer2_mount;
135 struct hammer2_pfsmount;
137 struct hammer2_state;
141 * The xid tracks internal transactional updates.
143 * XXX fix-me, really needs to be 64-bits
145 typedef uint32_t hammer2_xid_t;
147 #define HAMMER2_XID_MIN 0x00000000U
148 #define HAMMER2_XID_MAX 0x7FFFFFFFU
151 * The chain structure tracks a portion of the media topology from the
152 * root (volume) down. Chains represent volumes, inodes, indirect blocks,
153 * data blocks, and freemap nodes and leafs.
155 * The chain structure can be multi-homed and its topological recursion
156 * (chain->core) can be shared amongst several chains. Chain structures
157 * are topologically stable once placed in the in-memory topology (they
158 * don't move around). Modifications which cross flush synchronization
159 * boundaries, renames, resizing, or any move of the chain to elsewhere
160 * in the topology is accomplished via the DELETE-DUPLICATE mechanism.
162 * Deletions and delete-duplicates:
164 * Any movement of chains within the topology utilize a delete-duplicate
165 * operation instead of a simple rename. That is, the chain must be
166 * deleted from its original location and then duplicated to the new
167 * location. A new chain structure is allocated while the old is
168 * deleted. Deleted chains are removed from the above chain_core's
169 * rbtree but remain linked via the shadow topology for flush
170 * synchronization purposes.
172 * delete_bmap is allocated and a bit set if the chain was originally
173 * loaded via the blockmap.
175 * Flush synchronization:
177 * Flushes must synchronize chains up through the root. To do this
178 * the in-memory topology would normally have to be frozen during the
179 * flush. To avoid freezing the topology and to allow concurrent
180 * foreground / flush activity, any new modifications made while a
181 * flush is in progress retains the original chain in a shadow topology
182 * that is only visible to the flush code. Only one flush can be
183 * running at a time so the shadow hierarchy can be implemented with
184 * just a few link fields in our in-memory data structures.
188 * (1) Fully coherent snapshots can be taken without requiring
189 * a pre-flush, resulting in extremely fast (sub-millisecond)
192 * (2) Multiple synchronization points can be in-flight at the same
193 * time, representing multiple snapshots or flushes.
195 * (3) The algorithms needed to keep track of everything are actually
198 * Special Considerations:
200 * A chain is ref-counted on a per-chain basis, but the chain's lock
201 * is associated with the shared chain_core and is not per-chain.
203 * The power-of-2 nature of the media radix tree ensures that there
204 * will be no overlaps which straddle edges.
206 RB_HEAD(hammer2_chain_tree, hammer2_chain);
207 TAILQ_HEAD(h2_flush_deferral_list, hammer2_chain);
208 TAILQ_HEAD(h2_core_list, hammer2_chain);
210 #define CHAIN_CORE_DELETE_BMAP_ENTRIES \
211 (HAMMER2_PBUFSIZE / sizeof(hammer2_blockref_t) / sizeof(uint32_t))
213 struct hammer2_chain_core {
216 struct h2_core_list ownerq; /* all chains sharing this core */
217 struct hammer2_chain_tree rbtree; /* live chains */
218 struct hammer2_chain_tree dbtree; /* bmapped deletions */
219 struct h2_core_list dbq; /* other deletions */
220 int live_zero; /* blockref array opt */
223 u_int live_count; /* live (not deleted) chains in tree */
224 u_int chain_count; /* live + deleted chains under core */
225 int generation; /* generation number (inserts only) */
228 typedef struct hammer2_chain_core hammer2_chain_core_t;
230 #define HAMMER2_CORE_UNUSED0001 0x0001
231 #define HAMMER2_CORE_COUNTEDBREFS 0x0002
234 * H2 is a copy-on-write filesystem. In order to allow chains to allocate
235 * smaller blocks (down to 64-bytes), but improve performance and make
236 * clustered I/O possible using larger block sizes, the kernel buffer cache
237 * is abstracted via the hammer2_io structure.
239 RB_HEAD(hammer2_io_tree, hammer2_io);
242 RB_ENTRY(hammer2_io) rbnode; /* indexed by device offset */
243 struct spinlock spin;
244 struct hammer2_mount *hmp;
249 void (*callback)(struct hammer2_io *dio,
250 struct hammer2_cluster *cluster,
251 struct hammer2_chain *chain,
252 void *arg1, off_t arg2);
253 struct hammer2_cluster *arg_l; /* INPROG I/O only */
254 struct hammer2_chain *arg_c; /* INPROG I/O only */
255 void *arg_p; /* INPROG I/O only */
256 off_t arg_o; /* INPROG I/O only */
258 int act; /* activity */
261 typedef struct hammer2_io hammer2_io_t;
264 * Primary chain structure keeps track of the topology in-memory.
266 struct hammer2_chain {
267 TAILQ_ENTRY(hammer2_chain) core_entry; /* contemporary chains */
268 RB_ENTRY(hammer2_chain) rbnode; /* live chain(s) */
269 TAILQ_ENTRY(hammer2_chain) db_entry; /* non bmapped deletions */
270 hammer2_blockref_t bref;
271 hammer2_chain_core_t *core;
272 hammer2_chain_core_t *above;
273 struct hammer2_state *state; /* if active cache msg */
274 struct hammer2_mount *hmp;
275 struct hammer2_pfsmount *pmp; /* (pfs-cluster pmp or spmp) */
277 hammer2_xid_t modify_xid; /* flush filter */
278 hammer2_xid_t delete_xid; /* flush filter */
279 hammer2_xid_t update_xlo; /* flush propagation */
280 hammer2_xid_t update_xhi; /* setsubmod propagation */
281 hammer2_key_t data_count; /* delta's to apply */
282 hammer2_key_t inode_count; /* delta's to apply */
283 hammer2_io_t *dio; /* physical data buffer */
284 u_int bytes; /* physical data size */
288 hammer2_media_data_t *data; /* data pointer shortcut */
289 TAILQ_ENTRY(hammer2_chain) flush_node; /* flush deferral list */
294 typedef struct hammer2_chain hammer2_chain_t;
296 int hammer2_chain_cmp(hammer2_chain_t *chain1, hammer2_chain_t *chain2);
297 RB_PROTOTYPE(hammer2_chain_tree, hammer2_chain, rbnode, hammer2_chain_cmp);
300 * Special notes on flags:
302 * INITIAL - This flag allows a chain to be created and for storage to
303 * be allocated without having to immediately instantiate the
304 * related buffer. The data is assumed to be all-zeros. It
305 * is primarily used for indirect blocks.
307 * MODIFIED- The chain's media data has been modified.
309 #define HAMMER2_CHAIN_MODIFIED 0x00000001 /* dirty chain data */
310 #define HAMMER2_CHAIN_ALLOCATED 0x00000002 /* kmalloc'd chain */
311 #define HAMMER2_CHAIN_FLUSH_TEMPORARY 0x00000004
312 #define HAMMER2_CHAIN_FORCECOW 0x00000008 /* force copy-on-wr */
313 #define HAMMER2_CHAIN_DELETED 0x00000010 /* deleted chain */
314 #define HAMMER2_CHAIN_INITIAL 0x00000020 /* initial create */
315 #define HAMMER2_CHAIN_FLUSH_CREATE 0x00000040 /* needs flush blkadd */
316 #define HAMMER2_CHAIN_FLUSH_DELETE 0x00000080 /* needs flush blkdel */
317 #define HAMMER2_CHAIN_IOFLUSH 0x00000100 /* bawrite on put */
318 #define HAMMER2_CHAIN_DEFERRED 0x00000200 /* on a deferral list */
319 #define HAMMER2_CHAIN_UNLINKED 0x00000400 /* delete on reclaim */
320 #define HAMMER2_CHAIN_VOLUMESYNC 0x00000800 /* needs volume sync */
321 #define HAMMER2_CHAIN_ONDBQ 0x00001000 /* !bmapped deletes */
322 #define HAMMER2_CHAIN_MOUNTED 0x00002000 /* PFS is mounted */
323 #define HAMMER2_CHAIN_ONRBTREE 0x00004000 /* on parent RB tree */
324 #define HAMMER2_CHAIN_SNAPSHOT 0x00008000 /* snapshot special */
325 #define HAMMER2_CHAIN_EMBEDDED 0x00010000 /* embedded data */
326 #define HAMMER2_CHAIN_RELEASE 0x00020000 /* don't keep around */
327 #define HAMMER2_CHAIN_BMAPPED 0x00040000 /* in parent blkmap */
328 #define HAMMER2_CHAIN_ONDBTREE 0x00080000 /* bmapped deletes */
329 #define HAMMER2_CHAIN_DUPLICATED 0x00100000 /* fwd delete-dup */
330 #define HAMMER2_CHAIN_PFSROOT 0x00200000 /* in pfs->cluster */
331 #define HAMMER2_CHAIN_PFSBOUNDARY 0x00400000 /* super->pfs inode */
334 * Flags passed to hammer2_chain_lookup() and hammer2_chain_next()
336 * NOTE: MATCHIND allows an indirect block / freemap node to be returned
337 * when the passed key range matches the radix. Remember that key_end
338 * is inclusive (e.g. {0x000,0xFFF}, not {0x000,0x1000}).
340 #define HAMMER2_LOOKUP_NOLOCK 0x00000001 /* ref only */
341 #define HAMMER2_LOOKUP_NODATA 0x00000002 /* data left NULL */
342 #define HAMMER2_LOOKUP_SHARED 0x00000100
343 #define HAMMER2_LOOKUP_MATCHIND 0x00000200 /* return all chains */
344 #define HAMMER2_LOOKUP_UNUSED0400 0x00000400
345 #define HAMMER2_LOOKUP_ALWAYS 0x00000800 /* resolve data */
348 * Flags passed to hammer2_chain_modify() and hammer2_chain_resize()
350 * NOTE: OPTDATA allows us to avoid instantiating buffers for INDIRECT
351 * blocks in the INITIAL-create state.
353 #define HAMMER2_MODIFY_OPTDATA 0x00000002 /* data can be NULL */
354 #define HAMMER2_MODIFY_NO_MODIFY_TID 0x00000004
355 #define HAMMER2_MODIFY_ASSERTNOCOPY 0x00000008 /* assert no del-dup */
356 #define HAMMER2_MODIFY_NOREALLOC 0x00000010
357 #define HAMMER2_MODIFY_INPLACE 0x00000020 /* don't del-dup */
360 * Flags passed to hammer2_chain_lock()
362 #define HAMMER2_RESOLVE_NEVER 1
363 #define HAMMER2_RESOLVE_MAYBE 2
364 #define HAMMER2_RESOLVE_ALWAYS 3
365 #define HAMMER2_RESOLVE_MASK 0x0F
367 #define HAMMER2_RESOLVE_SHARED 0x10 /* request shared lock */
368 #define HAMMER2_RESOLVE_NOREF 0x20 /* already ref'd on lock */
371 * Flags passed to hammer2_chain_delete()
373 #define HAMMER2_DELETE_UNUSED0001 0x0001
376 * Flags passed to hammer2_chain_delete_duplicate()
378 #define HAMMER2_DELDUP_RECORE 0x0001
381 * Cluster different types of storage together for allocations
383 #define HAMMER2_FREECACHE_INODE 0
384 #define HAMMER2_FREECACHE_INDIR 1
385 #define HAMMER2_FREECACHE_DATA 2
386 #define HAMMER2_FREECACHE_UNUSED3 3
387 #define HAMMER2_FREECACHE_TYPES 4
390 * hammer2_freemap_alloc() block preference
392 #define HAMMER2_OFF_NOPREF ((hammer2_off_t)-1)
395 * BMAP read-ahead maximum parameters
397 #define HAMMER2_BMAP_COUNT 16 /* max bmap read-ahead */
398 #define HAMMER2_BMAP_BYTES (HAMMER2_PBUFSIZE * HAMMER2_BMAP_COUNT)
403 #define HAMMER2_FLUSH_DEPTH_LIMIT 10 /* stack recursion limit */
406 * hammer2_freemap_adjust()
408 #define HAMMER2_FREEMAP_DORECOVER 1
409 #define HAMMER2_FREEMAP_DOMAYFREE 2
410 #define HAMMER2_FREEMAP_DOREALFREE 3
413 * HAMMER2 cluster - A set of chains representing the same entity.
415 * The hammer2_pfsmount structure embeds a hammer2_cluster. All other
416 * hammer2_cluster use cases use temporary allocations.
418 * The cluster API mimics the chain API. Except as used in the pfsmount,
419 * the cluster structure is a temporary 'working copy' of a set of chains
420 * representing targets compatible with the operation. However, for
421 * performance reasons the cluster API does not necessarily issue concurrent
422 * requests to the underlying chain API for all compatible chains all the
423 * time. This may sometimes necessitate revisiting parent cluster nodes
424 * to 'flesh out' (validate more chains).
426 * If an insufficient number of chains remain in a working copy, the operation
427 * may have to be downgraded, retried, or stall until the requisit number
428 * of chains are available.
430 #define HAMMER2_MAXCLUSTER 8
432 struct hammer2_cluster {
433 int status; /* operational status */
434 int refs; /* track for deallocation */
435 struct hammer2_pfsmount *pmp;
438 hammer2_chain_t *focus; /* current focus (or mod) */
439 hammer2_chain_t *array[HAMMER2_MAXCLUSTER];
440 char missed[HAMMER2_MAXCLUSTER];
441 int cache_index[HAMMER2_MAXCLUSTER];
444 typedef struct hammer2_cluster hammer2_cluster_t;
446 #define HAMMER2_CLUSTER_INODE 0x00000001 /* embedded in inode */
447 #define HAMMER2_CLUSTER_NOSYNC 0x00000002 /* not in sync (cumulative) */
450 RB_HEAD(hammer2_inode_tree, hammer2_inode);
455 * NOTE: The inode's attribute CST which is also used to lock the inode
456 * is embedded in the chain (chain.cst) and aliased w/ attr_cst.
458 struct hammer2_inode {
459 RB_ENTRY(hammer2_inode) rbnode; /* inumber lookup (HL) */
460 ccms_cst_t topo_cst; /* directory topology cst */
461 struct hammer2_pfsmount *pmp; /* PFS mount */
462 struct hammer2_inode *pip; /* parent inode */
464 hammer2_cluster_t cluster;
465 struct lockf advlock;
468 u_int refs; /* +vpref, +flushref */
469 uint8_t comp_heuristic;
474 typedef struct hammer2_inode hammer2_inode_t;
476 #define HAMMER2_INODE_MODIFIED 0x0001
477 #define HAMMER2_INODE_SROOT 0x0002 /* kmalloc special case */
478 #define HAMMER2_INODE_RENAME_INPROG 0x0004
479 #define HAMMER2_INODE_ONRBTREE 0x0008
480 #define HAMMER2_INODE_RESIZED 0x0010
481 #define HAMMER2_INODE_MTIME 0x0020
483 int hammer2_inode_cmp(hammer2_inode_t *ip1, hammer2_inode_t *ip2);
484 RB_PROTOTYPE2(hammer2_inode_tree, hammer2_inode, rbnode, hammer2_inode_cmp,
488 * inode-unlink side-structure
490 struct hammer2_inode_unlink {
491 TAILQ_ENTRY(hammer2_inode_unlink) entry;
494 TAILQ_HEAD(hammer2_unlk_list, hammer2_inode_unlink);
496 typedef struct hammer2_inode_unlink hammer2_inode_unlink_t;
499 * A hammer2 transaction and flush sequencing structure.
501 * This global structure is tied into hammer2_mount and is used
502 * to sequence modifying operations and flushes.
504 * (a) Any modifying operations with sync_tid >= flush_tid will stall until
505 * all modifying operating with sync_tid < flush_tid complete.
507 * The flush related to flush_tid stalls until all modifying operations
508 * with sync_tid < flush_tid complete.
510 * (b) Once unstalled, modifying operations with sync_tid > flush_tid are
511 * allowed to run. All modifications cause modify/duplicate operations
512 * to occur on the related chains. Note that most INDIRECT blocks will
513 * be unaffected because the modifications just overload the RBTREE
514 * structurally instead of actually modifying the indirect blocks.
516 * (c) The actual flush unstalls and RUNS CONCURRENTLY with (b), but only
517 * utilizes the chain structures with sync_tid <= flush_tid. The
518 * flush will modify related indirect blocks and inodes in-place
519 * (rather than duplicate) since the adjustments are compatible with
520 * (b)'s RBTREE overloading
522 * SPECIAL NOTE: Inode modifications have to also propagate along any
523 * modify/duplicate chains. File writes detect the flush
524 * and force out the conflicting buffer cache buffer(s)
525 * before reusing them.
527 * (d) Snapshots can be made instantly but must be flushed and disconnected
528 * from their duplicative source before they can be mounted. This is
529 * because while H2's on-media structure supports forks, its in-memory
530 * structure only supports very simple forking for background flushing
533 * TODO: Flush merging. When fsync() is called on multiple discrete files
534 * concurrently there is no reason to stall the second fsync.
535 * The final flush that reaches to root can cover both fsync()s.
537 * The chains typically terminate as they fly onto the disk. The flush
538 * ultimately reaches the volume header.
540 struct hammer2_trans {
541 TAILQ_ENTRY(hammer2_trans) entry;
542 struct hammer2_pfsmount *pmp;
543 hammer2_xid_t sync_xid;
544 hammer2_tid_t inode_tid; /* inode number assignment */
545 thread_t td; /* pointer */
548 uint8_t inodes_created;
552 typedef struct hammer2_trans hammer2_trans_t;
554 #define HAMMER2_TRANS_ISFLUSH 0x0001 /* formal flush */
555 #define HAMMER2_TRANS_CONCURRENT 0x0002 /* concurrent w/flush */
556 #define HAMMER2_TRANS_BUFCACHE 0x0004 /* from bioq strategy write */
557 #define HAMMER2_TRANS_NEWINODE 0x0008 /* caller allocating inode */
558 #define HAMMER2_TRANS_UNUSED0010 0x0010
559 #define HAMMER2_TRANS_PREFLUSH 0x0020 /* preflush state */
561 #define HAMMER2_FREEMAP_HEUR_NRADIX 4 /* pwr 2 PBUFRADIX-MINIORADIX */
562 #define HAMMER2_FREEMAP_HEUR_TYPES 8
563 #define HAMMER2_FREEMAP_HEUR (HAMMER2_FREEMAP_HEUR_NRADIX * \
564 HAMMER2_FREEMAP_HEUR_TYPES)
566 #define HAMMER2_CLUSTER_COPY_NOCHAINS 0x0001 /* do not copy or ref chains */
567 #define HAMMER2_CLUSTER_COPY_NOREF 0x0002 /* do not ref chains or cl */
570 * Transaction Rendezvous
572 TAILQ_HEAD(hammer2_trans_queue, hammer2_trans);
574 struct hammer2_trans_manage {
575 hammer2_xid_t flush_xid; /* last flush transaction */
576 hammer2_xid_t alloc_xid;
577 struct lock translk; /* lockmgr lock */
578 struct hammer2_trans_queue transq; /* modifying transactions */
579 int flushcnt; /* track flush trans */
582 typedef struct hammer2_trans_manage hammer2_trans_manage_t;
585 * Global (per device) mount structure for device (aka vp->v_mount->hmp)
587 struct hammer2_mount {
588 struct vnode *devvp; /* device vnode */
589 int ronly; /* read-only mount */
590 int pmp_count; /* PFS mounts backed by us */
591 TAILQ_ENTRY(hammer2_mount) mntentry; /* hammer2_mntlist */
593 struct malloc_type *mchain;
596 kdmsg_iocom_t iocom; /* volume-level dmsg interface */
597 struct spinlock io_spin; /* iotree access */
598 struct hammer2_io_tree iotree;
600 hammer2_chain_t vchain; /* anchor chain (topology) */
601 hammer2_chain_t fchain; /* anchor chain (freemap) */
602 struct hammer2_pfsmount *spmp; /* super-root pmp for transactions */
603 struct lock vollk; /* lockmgr lock */
604 hammer2_off_t heur_freemap[HAMMER2_FREEMAP_HEUR];
605 int volhdrno; /* last volhdrno written */
606 hammer2_volume_data_t voldata;
607 hammer2_volume_data_t volsync; /* synchronized voldata */
610 typedef struct hammer2_mount hammer2_mount_t;
613 * HAMMER2 PFS mount point structure (aka vp->v_mount->mnt_data).
614 * This has a 1:1 correspondence to struct mount (note that the
615 * hammer2_mount structure has a N:1 correspondence).
617 * This structure represents a cluster mount and not necessarily a
618 * PFS under a specific device mount (HMP). The distinction is important
619 * because the elements backing a cluster mount can change on the fly.
621 * Usually the first element under the cluster represents the original
622 * user-requested mount that bootstraps the whole mess. In significant
623 * setups the original is usually just a read-only media image (or
624 * representitive file) that simply contains a bootstrap volume header
625 * listing the configuration.
627 struct hammer2_pfsmount {
629 TAILQ_ENTRY(hammer2_pfsmount) mntentry; /* hammer2_pfslist */
632 hammer2_mount_t *spmp_hmp; /* (spmp only) */
633 hammer2_inode_t *iroot; /* PFS root inode */
634 hammer2_inode_t *ihidden; /* PFS hidden directory */
635 struct lock lock; /* PFS lock for certain ops */
636 hammer2_off_t inode_count; /* copy of inode_count */
637 ccms_domain_t ccms_dom;
638 struct netexport export; /* nfs export */
639 int ronly; /* read-only mount */
640 struct malloc_type *minode;
641 struct malloc_type *mmsg;
642 struct spinlock inum_spin; /* inumber lookup */
643 struct hammer2_inode_tree inum_tree; /* (not applicable to spmp) */
644 hammer2_tid_t alloc_tid;
645 hammer2_tid_t flush_tid;
646 hammer2_tid_t inode_tid;
648 long inmem_dirty_chains;
649 int count_lwinprog; /* logical write in prog */
650 struct spinlock unlinkq_spin;
651 struct hammer2_unlk_list unlinkq;
652 thread_t wthread_td; /* write thread td */
653 struct bio_queue_head wthread_bioq; /* logical buffer bioq */
654 struct mtx wthread_mtx; /* interlock */
655 int wthread_destroy;/* termination sequencing */
658 typedef struct hammer2_pfsmount hammer2_pfsmount_t;
660 #define HAMMER2_DIRTYCHAIN_WAITING 0x80000000
661 #define HAMMER2_DIRTYCHAIN_MASK 0x7FFFFFFF
663 #define HAMMER2_LWINPROG_WAITING 0x80000000
664 #define HAMMER2_LWINPROG_MASK 0x7FFFFFFF
668 MALLOC_DECLARE(M_HAMMER2);
670 #define VTOI(vp) ((hammer2_inode_t *)(vp)->v_data)
671 #define ITOV(ip) ((ip)->vp)
674 * Currently locked chains retain the locked buffer cache buffer for
675 * indirect blocks, and indirect blocks can be one of two sizes. The
676 * device buffer has to match the case to avoid deadlocking recursive
677 * chains that might otherwise try to access different offsets within
678 * the same device buffer.
682 hammer2_devblkradix(int radix)
684 if (radix <= HAMMER2_LBUFRADIX) {
685 return (HAMMER2_LBUFRADIX);
687 return (HAMMER2_PBUFRADIX);
693 hammer2_devblksize(size_t bytes)
695 if (bytes <= HAMMER2_LBUFSIZE) {
696 return(HAMMER2_LBUFSIZE);
698 KKASSERT(bytes <= HAMMER2_PBUFSIZE &&
699 (bytes ^ (bytes - 1)) == ((bytes << 1) - 1));
700 return (HAMMER2_PBUFSIZE);
707 MPTOPMP(struct mount *mp)
709 return ((hammer2_pfsmount_t *)mp->mnt_data);
712 extern struct vop_ops hammer2_vnode_vops;
713 extern struct vop_ops hammer2_spec_vops;
714 extern struct vop_ops hammer2_fifo_vops;
716 extern int hammer2_debug;
717 extern int hammer2_cluster_enable;
718 extern int hammer2_hardlink_enable;
719 extern int hammer2_flush_pipe;
720 extern int hammer2_synchronous_flush;
721 extern int hammer2_dio_count;
722 extern long hammer2_limit_dirty_chains;
723 extern long hammer2_iod_file_read;
724 extern long hammer2_iod_meta_read;
725 extern long hammer2_iod_indr_read;
726 extern long hammer2_iod_fmap_read;
727 extern long hammer2_iod_volu_read;
728 extern long hammer2_iod_file_write;
729 extern long hammer2_iod_meta_write;
730 extern long hammer2_iod_indr_write;
731 extern long hammer2_iod_fmap_write;
732 extern long hammer2_iod_volu_write;
733 extern long hammer2_ioa_file_read;
734 extern long hammer2_ioa_meta_read;
735 extern long hammer2_ioa_indr_read;
736 extern long hammer2_ioa_fmap_read;
737 extern long hammer2_ioa_volu_read;
738 extern long hammer2_ioa_file_write;
739 extern long hammer2_ioa_meta_write;
740 extern long hammer2_ioa_indr_write;
741 extern long hammer2_ioa_fmap_write;
742 extern long hammer2_ioa_volu_write;
744 extern struct objcache *cache_buffer_read;
745 extern struct objcache *cache_buffer_write;
748 extern int write_thread_wakeup;
750 extern mtx_t thread_protect;
755 #define hammer2_icrc32(buf, size) iscsi_crc32((buf), (size))
756 #define hammer2_icrc32c(buf, size, crc) iscsi_crc32_ext((buf), (size), (crc))
758 hammer2_cluster_t *hammer2_inode_lock_ex(hammer2_inode_t *ip);
759 hammer2_cluster_t *hammer2_inode_lock_sh(hammer2_inode_t *ip);
760 void hammer2_inode_unlock_ex(hammer2_inode_t *ip, hammer2_cluster_t *chain);
761 void hammer2_inode_unlock_sh(hammer2_inode_t *ip, hammer2_cluster_t *chain);
762 ccms_state_t hammer2_inode_lock_temp_release(hammer2_inode_t *ip);
763 void hammer2_inode_lock_temp_restore(hammer2_inode_t *ip, ccms_state_t ostate);
764 ccms_state_t hammer2_inode_lock_upgrade(hammer2_inode_t *ip);
765 void hammer2_inode_lock_downgrade(hammer2_inode_t *ip, ccms_state_t ostate);
767 void hammer2_mount_exlock(hammer2_mount_t *hmp);
768 void hammer2_mount_shlock(hammer2_mount_t *hmp);
769 void hammer2_mount_unlock(hammer2_mount_t *hmp);
771 int hammer2_get_dtype(const hammer2_inode_data_t *ipdata);
772 int hammer2_get_vtype(const hammer2_inode_data_t *ipdata);
773 u_int8_t hammer2_get_obj_type(enum vtype vtype);
774 void hammer2_time_to_timespec(u_int64_t xtime, struct timespec *ts);
775 u_int64_t hammer2_timespec_to_time(const struct timespec *ts);
776 u_int32_t hammer2_to_unix_xid(const uuid_t *uuid);
777 void hammer2_guid_to_uuid(uuid_t *uuid, u_int32_t guid);
778 hammer2_xid_t hammer2_trans_newxid(hammer2_pfsmount_t *pmp);
779 void hammer2_trans_manage_init(void);
781 hammer2_key_t hammer2_dirhash(const unsigned char *name, size_t len);
782 int hammer2_getradix(size_t bytes);
784 int hammer2_calc_logical(hammer2_inode_t *ip, hammer2_off_t uoff,
785 hammer2_key_t *lbasep, hammer2_key_t *leofp);
786 int hammer2_calc_physical(hammer2_inode_t *ip,
787 const hammer2_inode_data_t *ipdata,
788 hammer2_key_t lbase);
789 void hammer2_update_time(uint64_t *timep);
790 void hammer2_adjreadcounter(hammer2_blockref_t *bref, size_t bytes);
795 struct vnode *hammer2_igetv(hammer2_inode_t *ip, hammer2_cluster_t *cparent,
797 void hammer2_inode_lock_nlinks(hammer2_inode_t *ip);
798 void hammer2_inode_unlock_nlinks(hammer2_inode_t *ip);
799 hammer2_inode_t *hammer2_inode_lookup(hammer2_pfsmount_t *pmp,
801 hammer2_inode_t *hammer2_inode_get(hammer2_pfsmount_t *pmp,
802 hammer2_inode_t *dip, hammer2_cluster_t *cluster);
803 void hammer2_inode_free(hammer2_inode_t *ip);
804 void hammer2_inode_ref(hammer2_inode_t *ip);
805 void hammer2_inode_drop(hammer2_inode_t *ip);
806 void hammer2_inode_repoint(hammer2_inode_t *ip, hammer2_inode_t *pip,
807 hammer2_cluster_t *cluster);
808 void hammer2_run_unlinkq(hammer2_trans_t *trans, hammer2_pfsmount_t *pmp);
810 hammer2_inode_t *hammer2_inode_create(hammer2_trans_t *trans,
811 hammer2_inode_t *dip,
812 struct vattr *vap, struct ucred *cred,
813 const uint8_t *name, size_t name_len,
814 hammer2_cluster_t **clusterp, int *errorp);
815 int hammer2_inode_connect(hammer2_trans_t *trans,
816 hammer2_cluster_t **clusterp, int hlink,
817 hammer2_inode_t *dip, hammer2_cluster_t *dcluster,
818 const uint8_t *name, size_t name_len,
820 hammer2_inode_t *hammer2_inode_common_parent(hammer2_inode_t *fdip,
821 hammer2_inode_t *tdip);
822 void hammer2_inode_fsync(hammer2_trans_t *trans, hammer2_inode_t *ip,
823 hammer2_cluster_t *cparent);
824 int hammer2_unlink_file(hammer2_trans_t *trans, hammer2_inode_t *dip,
825 const uint8_t *name, size_t name_len, int isdir,
826 int *hlinkp, struct nchandle *nch);
827 int hammer2_hardlink_consolidate(hammer2_trans_t *trans,
828 hammer2_inode_t *ip, hammer2_cluster_t **clusterp,
829 hammer2_inode_t *cdip, hammer2_cluster_t *cdcluster,
831 int hammer2_hardlink_deconsolidate(hammer2_trans_t *trans, hammer2_inode_t *dip,
832 hammer2_chain_t **chainp, hammer2_chain_t **ochainp);
833 int hammer2_hardlink_find(hammer2_inode_t *dip, hammer2_cluster_t *cluster);
834 void hammer2_inode_install_hidden(hammer2_pfsmount_t *pmp);
839 void hammer2_voldata_lock(hammer2_mount_t *hmp);
840 void hammer2_voldata_unlock(hammer2_mount_t *hmp);
841 void hammer2_voldata_modify(hammer2_mount_t *hmp);
842 hammer2_chain_t *hammer2_chain_alloc(hammer2_mount_t *hmp,
843 hammer2_pfsmount_t *pmp,
844 hammer2_trans_t *trans,
845 hammer2_blockref_t *bref);
846 void hammer2_chain_core_alloc(hammer2_trans_t *trans, hammer2_chain_t *nchain,
847 hammer2_chain_t *ochain);
848 void hammer2_chain_ref(hammer2_chain_t *chain);
849 void hammer2_chain_drop(hammer2_chain_t *chain);
850 int hammer2_chain_lock(hammer2_chain_t *chain, int how);
851 void hammer2_chain_load_async(hammer2_cluster_t *cluster,
852 void (*func)(hammer2_io_t *dio,
853 hammer2_cluster_t *cluster,
854 hammer2_chain_t *chain,
855 void *arg_p, off_t arg_o),
857 void hammer2_chain_moved(hammer2_chain_t *chain);
858 void hammer2_chain_modify(hammer2_trans_t *trans,
859 hammer2_chain_t **chainp, int flags);
860 void hammer2_chain_resize(hammer2_trans_t *trans, hammer2_inode_t *ip,
861 hammer2_chain_t *parent,
862 hammer2_chain_t **chainp,
863 int nradix, int flags);
864 void hammer2_chain_unlock(hammer2_chain_t *chain);
865 void hammer2_chain_wait(hammer2_chain_t *chain);
866 hammer2_chain_t *hammer2_chain_get(hammer2_chain_t *parent, int generation,
867 hammer2_blockref_t *bref);
868 hammer2_chain_t *hammer2_chain_lookup_init(hammer2_chain_t *parent, int flags);
869 void hammer2_chain_lookup_done(hammer2_chain_t *parent);
870 hammer2_chain_t *hammer2_chain_lookup(hammer2_chain_t **parentp,
871 hammer2_key_t *key_nextp,
872 hammer2_key_t key_beg, hammer2_key_t key_end,
873 int *cache_indexp, int flags, int *ddflagp);
874 hammer2_chain_t *hammer2_chain_next(hammer2_chain_t **parentp,
875 hammer2_chain_t *chain,
876 hammer2_key_t *key_nextp,
877 hammer2_key_t key_beg, hammer2_key_t key_end,
878 int *cache_indexp, int flags);
879 hammer2_chain_t *hammer2_chain_scan(hammer2_chain_t *parent,
880 hammer2_chain_t *chain,
881 int *cache_indexp, int flags);
883 int hammer2_chain_create(hammer2_trans_t *trans, hammer2_chain_t **parentp,
884 hammer2_chain_t **chainp,
885 hammer2_pfsmount_t *pmp,
886 hammer2_key_t key, int keybits,
887 int type, size_t bytes);
888 void hammer2_chain_duplicate(hammer2_trans_t *trans, hammer2_chain_t **parentp,
889 hammer2_chain_t **chainp,
890 hammer2_blockref_t *bref, int snapshot,
891 int duplicate_reason);
892 int hammer2_chain_snapshot(hammer2_trans_t *trans, hammer2_chain_t **chainp,
893 hammer2_ioc_pfs_t *pfs);
894 void hammer2_chain_delete(hammer2_trans_t *trans, hammer2_chain_t *chain,
896 void hammer2_chain_delete_duplicate(hammer2_trans_t *trans,
897 hammer2_chain_t **chainp, int flags);
898 void hammer2_flush(hammer2_trans_t *trans, hammer2_chain_t **chainp);
899 void hammer2_chain_commit(hammer2_trans_t *trans, hammer2_chain_t *chain);
900 void hammer2_chain_setsubmod(hammer2_trans_t *trans, hammer2_chain_t *chain);
901 void hammer2_chain_countbrefs(hammer2_chain_t *chain,
902 hammer2_blockref_t *base, int count);
904 void hammer2_pfs_memory_wait(hammer2_pfsmount_t *pmp);
905 void hammer2_pfs_memory_inc(hammer2_pfsmount_t *pmp);
906 void hammer2_pfs_memory_wakeup(hammer2_pfsmount_t *pmp);
908 int hammer2_base_find(hammer2_chain_t *chain,
909 hammer2_blockref_t *base, int count,
910 int *cache_indexp, hammer2_key_t *key_nextp,
911 hammer2_key_t key_beg, hammer2_key_t key_end,
913 void hammer2_base_delete(hammer2_trans_t *trans, hammer2_chain_t *chain,
914 hammer2_blockref_t *base, int count,
915 int *cache_indexp, hammer2_chain_t *child);
916 void hammer2_base_insert(hammer2_trans_t *trans, hammer2_chain_t *chain,
917 hammer2_blockref_t *base, int count,
918 int *cache_indexp, hammer2_chain_t *child);
919 void hammer2_chain_refactor(hammer2_chain_t **chainp);
924 void hammer2_trans_init(hammer2_trans_t *trans, hammer2_pfsmount_t *pmp,
926 void hammer2_trans_spmp(hammer2_trans_t *trans, hammer2_pfsmount_t *pmp);
927 void hammer2_trans_done(hammer2_trans_t *trans);
932 int hammer2_ioctl(hammer2_inode_t *ip, u_long com, void *data,
933 int fflag, struct ucred *cred);
938 hammer2_io_t *hammer2_io_getblk(hammer2_mount_t *hmp, off_t lbase,
939 int lsize, int *ownerp);
940 void hammer2_io_putblk(hammer2_io_t **diop);
941 void hammer2_io_cleanup(hammer2_mount_t *hmp, struct hammer2_io_tree *tree);
942 char *hammer2_io_data(hammer2_io_t *dio, off_t lbase);
943 int hammer2_io_new(hammer2_mount_t *hmp, off_t lbase, int lsize,
944 hammer2_io_t **diop);
945 int hammer2_io_newnz(hammer2_mount_t *hmp, off_t lbase, int lsize,
946 hammer2_io_t **diop);
947 int hammer2_io_newq(hammer2_mount_t *hmp, off_t lbase, int lsize,
948 hammer2_io_t **diop);
949 int hammer2_io_bread(hammer2_mount_t *hmp, off_t lbase, int lsize,
950 hammer2_io_t **diop);
951 void hammer2_io_breadcb(hammer2_mount_t *hmp, off_t lbase, int lsize,
952 void (*callback)(hammer2_io_t *dio,
953 hammer2_cluster_t *arg_l,
954 hammer2_chain_t *arg_c,
955 void *arg_p, off_t arg_o),
956 hammer2_cluster_t *arg_l,
957 hammer2_chain_t *arg_c,
958 void *arg_p, off_t arg_o);
959 void hammer2_io_bawrite(hammer2_io_t **diop);
960 void hammer2_io_bdwrite(hammer2_io_t **diop);
961 int hammer2_io_bwrite(hammer2_io_t **diop);
962 int hammer2_io_isdirty(hammer2_io_t *dio);
963 void hammer2_io_setdirty(hammer2_io_t *dio);
964 void hammer2_io_setinval(hammer2_io_t *dio, u_int bytes);
965 void hammer2_io_brelse(hammer2_io_t **diop);
966 void hammer2_io_bqrelse(hammer2_io_t **diop);
971 int hammer2_msg_dbg_rcvmsg(kdmsg_msg_t *msg);
972 int hammer2_msg_adhoc_input(kdmsg_msg_t *msg);
977 void hammer2_clusterctl_wakeup(kdmsg_iocom_t *iocom);
978 void hammer2_volconf_update(hammer2_mount_t *hmp, int index);
979 void hammer2_update_spans(hammer2_mount_t *hmp);
980 void hammer2_cluster_reconnect(hammer2_mount_t *hmp, struct file *fp);
981 void hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx);
982 void hammer2_bioq_sync(hammer2_pfsmount_t *pmp);
983 int hammer2_vfs_sync(struct mount *mp, int waitflags);
984 void hammer2_lwinprog_ref(hammer2_pfsmount_t *pmp);
985 void hammer2_lwinprog_drop(hammer2_pfsmount_t *pmp);
986 void hammer2_lwinprog_wait(hammer2_pfsmount_t *pmp);
991 int hammer2_freemap_alloc(hammer2_trans_t *trans, hammer2_chain_t *chain,
993 void hammer2_freemap_adjust(hammer2_trans_t *trans, hammer2_mount_t *hmp,
994 hammer2_blockref_t *bref, int how);
999 u_int hammer2_cluster_bytes(hammer2_cluster_t *cluster);
1000 uint8_t hammer2_cluster_type(hammer2_cluster_t *cluster);
1001 const hammer2_media_data_t *hammer2_cluster_data(hammer2_cluster_t *cluster);
1002 hammer2_media_data_t *hammer2_cluster_wdata(hammer2_cluster_t *cluster);
1003 hammer2_cluster_t *hammer2_cluster_from_chain(hammer2_chain_t *chain);
1004 int hammer2_cluster_modified(hammer2_cluster_t *cluster);
1005 int hammer2_cluster_unlinked(hammer2_cluster_t *cluster);
1006 int hammer2_cluster_duplicated(hammer2_cluster_t *cluster);
1007 void hammer2_cluster_set_chainflags(hammer2_cluster_t *cluster, uint32_t flags);
1008 void hammer2_cluster_bref(hammer2_cluster_t *cluster, hammer2_blockref_t *bref);
1009 void hammer2_cluster_setsubmod(hammer2_trans_t *trans,
1010 hammer2_cluster_t *cluster);
1011 hammer2_cluster_t *hammer2_cluster_alloc(hammer2_pfsmount_t *pmp,
1012 hammer2_trans_t *trans,
1013 hammer2_blockref_t *bref);
1014 void hammer2_cluster_core_alloc(hammer2_trans_t *trans,
1015 hammer2_cluster_t *ncluster,
1016 hammer2_cluster_t *ocluster);
1017 void hammer2_cluster_ref(hammer2_cluster_t *cluster);
1018 void hammer2_cluster_drop(hammer2_cluster_t *cluster);
1019 void hammer2_cluster_wait(hammer2_cluster_t *cluster);
1020 int hammer2_cluster_lock(hammer2_cluster_t *cluster, int how);
1021 void hammer2_cluster_replace(hammer2_cluster_t *dst, hammer2_cluster_t *src);
1022 void hammer2_cluster_replace_locked(hammer2_cluster_t *dst,
1023 hammer2_cluster_t *src);
1024 hammer2_cluster_t *hammer2_cluster_copy(hammer2_cluster_t *ocluster,
1026 void hammer2_cluster_refactor(hammer2_cluster_t *cluster);
1027 void hammer2_cluster_unlock(hammer2_cluster_t *cluster);
1028 void hammer2_cluster_resize(hammer2_trans_t *trans, hammer2_inode_t *ip,
1029 hammer2_cluster_t *cparent, hammer2_cluster_t *cluster,
1030 int nradix, int flags);
1031 hammer2_inode_data_t *hammer2_cluster_modify_ip(hammer2_trans_t *trans,
1032 hammer2_inode_t *ip, hammer2_cluster_t *cluster,
1034 void hammer2_cluster_modify(hammer2_trans_t *trans, hammer2_cluster_t *cluster,
1036 void hammer2_cluster_modsync(hammer2_cluster_t *cluster);
1037 hammer2_cluster_t *hammer2_cluster_lookup_init(hammer2_cluster_t *cparent,
1039 void hammer2_cluster_lookup_done(hammer2_cluster_t *cparent);
1040 hammer2_cluster_t *hammer2_cluster_lookup(hammer2_cluster_t *cparent,
1041 hammer2_key_t *key_nextp,
1042 hammer2_key_t key_beg, hammer2_key_t key_end,
1043 int flags, int *ddflagp);
1044 hammer2_cluster_t *hammer2_cluster_next(hammer2_cluster_t *cparent,
1045 hammer2_cluster_t *cluster,
1046 hammer2_key_t *key_nextp,
1047 hammer2_key_t key_beg, hammer2_key_t key_end,
1049 hammer2_cluster_t *hammer2_cluster_scan(hammer2_cluster_t *cparent,
1050 hammer2_cluster_t *cluster, int flags);
1051 int hammer2_cluster_create(hammer2_trans_t *trans, hammer2_cluster_t *cparent,
1052 hammer2_cluster_t **clusterp,
1053 hammer2_key_t key, int keybits, int type, size_t bytes);
1054 void hammer2_cluster_duplicate(hammer2_trans_t *trans,
1055 hammer2_cluster_t *cparent, hammer2_cluster_t *cluster,
1056 hammer2_blockref_t *bref,
1057 int snapshot, int duplicate_reason);
1058 void hammer2_cluster_delete_duplicate(hammer2_trans_t *trans,
1059 hammer2_cluster_t *cluster, int flags);
1060 void hammer2_cluster_delete(hammer2_trans_t *trans, hammer2_cluster_t *cluster,
1062 int hammer2_cluster_snapshot(hammer2_trans_t *trans,
1063 hammer2_cluster_t *ocluster, hammer2_ioc_pfs_t *pfs);
1065 #endif /* !_KERNEL */
1066 #endif /* !_VFS_HAMMER2_HAMMER2_H_ */