blob: bf2e7764920e92e3d621a94caac7124b3fa15914 [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * ocfs2_fs.h
5 *
6 * On-disk structures for OCFS2.
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License, version 2, as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public
20 * License along with this program; if not, write to the
21 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 * Boston, MA 021110-1307, USA.
23 */
24
25#ifndef _OCFS2_FS_H
26#define _OCFS2_FS_H
27
28/* Version */
29#define OCFS2_MAJOR_REV_LEVEL 0
30#define OCFS2_MINOR_REV_LEVEL 90
31
32/*
33 * An OCFS2 volume starts this way:
34 * Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS.
35 * Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS.
36 * Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock.
37 *
38 * All other structures are found from the superblock information.
39 *
40 * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors. eg, for a
41 * blocksize of 2K, it is 4096 bytes into disk.
42 */
43#define OCFS2_SUPER_BLOCK_BLKNO 2
44
45/*
46 * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could
47 * grow if needed.
48 */
49#define OCFS2_MIN_CLUSTERSIZE 4096
50#define OCFS2_MAX_CLUSTERSIZE 1048576
51
52/*
53 * Blocks cannot be bigger than clusters, so the maximum blocksize is the
54 * minimum cluster size.
55 */
56#define OCFS2_MIN_BLOCKSIZE 512
57#define OCFS2_MAX_BLOCKSIZE OCFS2_MIN_CLUSTERSIZE
58
59/* Filesystem magic number */
60#define OCFS2_SUPER_MAGIC 0x7461636f
61
62/* Object signatures */
63#define OCFS2_SUPER_BLOCK_SIGNATURE "OCFSV2"
64#define OCFS2_INODE_SIGNATURE "INODE01"
65#define OCFS2_EXTENT_BLOCK_SIGNATURE "EXBLK01"
66#define OCFS2_GROUP_DESC_SIGNATURE "GROUP01"
Tao Ma5a7bc8e2008-08-18 17:38:46 +080067#define OCFS2_XATTR_BLOCK_SIGNATURE "XATTR01"
Mark Fasheh87d35a72008-12-10 17:36:25 -080068#define OCFS2_DIR_TRAILER_SIGNATURE "DIRTRL1"
Mark Fasheh9b7895e2008-11-12 16:27:44 -080069#define OCFS2_DX_ROOT_SIGNATURE "DXDIR01"
70#define OCFS2_DX_LEAF_SIGNATURE "DXLEAF1"
Tao Ma721f69c2009-08-18 11:17:49 +080071#define OCFS2_REFCOUNT_BLOCK_SIGNATURE "REFCNT1"
Mark Fashehccd979b2005-12-15 14:31:24 -080072
73/* Compatibility flags */
74#define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \
75 ( OCFS2_SB(sb)->s_feature_compat & (mask) )
76#define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask) \
77 ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) )
78#define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask) \
79 ( OCFS2_SB(sb)->s_feature_incompat & (mask) )
80#define OCFS2_SET_COMPAT_FEATURE(sb,mask) \
81 OCFS2_SB(sb)->s_feature_compat |= (mask)
82#define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask) \
83 OCFS2_SB(sb)->s_feature_ro_compat |= (mask)
84#define OCFS2_SET_INCOMPAT_FEATURE(sb,mask) \
85 OCFS2_SB(sb)->s_feature_incompat |= (mask)
86#define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask) \
87 OCFS2_SB(sb)->s_feature_compat &= ~(mask)
88#define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
89 OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask)
90#define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
91 OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
92
Joel Beckera9772182008-12-16 18:10:18 -080093#define OCFS2_FEATURE_COMPAT_SUPP (OCFS2_FEATURE_COMPAT_BACKUP_SB \
94 | OCFS2_FEATURE_COMPAT_JBD2_SB)
Mark Fashehdcd05382007-01-16 11:32:23 -080095#define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
Mark Fasheh15b1e362007-09-07 13:58:15 -070096 | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
Joel Becker386a2ef2008-02-01 12:06:54 -080097 | OCFS2_FEATURE_INCOMPAT_INLINE_DATA \
Joel Beckerb61817e2008-02-01 15:08:23 -080098 | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \
Tiger Yang8154da32008-08-18 17:11:46 +080099 | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
Joel Becker9d28cfb2008-10-16 17:53:29 -0700100 | OCFS2_FEATURE_INCOMPAT_XATTR \
Mark Fasheh3a8df2b2008-11-24 17:14:09 -0800101 | OCFS2_FEATURE_INCOMPAT_META_ECC \
Tao Ma64871b82009-08-18 11:48:02 +0800102 | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS \
Tao Ma1a934c32010-03-18 15:54:22 +0800103 | OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE \
Sunil Mushran98f486f22010-10-09 10:24:46 -0700104 | OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG \
105 | OCFS2_FEATURE_INCOMPAT_CLUSTERINFO)
Jan Kara19ece542008-08-21 20:13:17 +0200106#define OCFS2_FEATURE_RO_COMPAT_SUPP (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \
107 | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \
108 | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
Mark Fashehccd979b2005-12-15 14:31:24 -0800109
110/*
111 * Heartbeat-only devices are missing journals and other files. The
112 * filesystem driver can't load them, but the library can. Never put
113 * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
114 */
115#define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002
116
Mark Fasheh89039012006-12-07 18:05:37 -0800117/*
118 * tunefs sets this incompat flag before starting the resize and clears it
119 * at the end. This flag protects users from inadvertently mounting the fs
120 * after an aborted run without fsck-ing.
121 */
122#define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004
Mark Fashehccd979b2005-12-15 14:31:24 -0800123
Sunil Mushranc271c5c2006-12-05 17:56:35 -0800124/* Used to denote a non-clustered volume */
125#define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008
126
Mark Fasheh89039012006-12-07 18:05:37 -0800127/* Support for sparse allocation in b-trees */
128#define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010
129
Mark Fashehccd979b2005-12-15 14:31:24 -0800130/*
Mark Fasheh92e91ce2007-09-20 11:19:20 -0700131 * Tunefs sets this incompat flag before starting an operation which
132 * would require cleanup on abort. This is done to protect users from
133 * inadvertently mounting the fs after an aborted run without
134 * fsck-ing.
135 *
136 * s_tunefs_flags on the super block describes precisely which
137 * operations were in progress.
138 */
139#define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG 0x0020
140
Mark Fasheh15b1e362007-09-07 13:58:15 -0700141/* Support for data packed into inode blocks */
142#define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040
143
Mark Fasheh92e91ce2007-09-20 11:19:20 -0700144/*
Joel Beckerb61817e2008-02-01 15:08:23 -0800145 * Support for alternate, userspace cluster stacks. If set, the superblock
146 * field s_cluster_info contains a tag for the alternate stack in use as
147 * well as the name of the cluster being joined.
148 * mount.ocfs2 must pass in a matching stack name.
149 *
150 * If not set, the classic stack will be used. This is compatbile with
151 * all older versions.
152 */
153#define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK 0x0080
154
Tiger Yang8154da32008-08-18 17:11:46 +0800155/* Support for the extended slot map */
156#define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100
157
158/* Support for extended attributes */
159#define OCFS2_FEATURE_INCOMPAT_XATTR 0x0200
160
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800161/* Support for indexed directores */
162#define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS 0x0400
163
Joel Beckerab552d52008-10-16 17:50:30 -0700164/* Metadata checksum and error correction */
165#define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800
166
Tao Ma721f69c2009-08-18 11:17:49 +0800167/* Refcount tree support */
168#define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000
169
Joel Becker4cbe4242010-04-13 14:26:12 +0800170/* Discontigous block groups */
171#define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG 0x2000
172
Joel Beckerb61817e2008-02-01 15:08:23 -0800173/*
Sunil Mushran98f486f22010-10-09 10:24:46 -0700174 * Incompat bit to indicate useable clusterinfo with stackflags for all
175 * cluster stacks (userspace adnd o2cb). If this bit is set,
176 * INCOMPAT_USERSPACE_STACK becomes superfluous and thus should not be set.
177 */
178#define OCFS2_FEATURE_INCOMPAT_CLUSTERINFO 0x4000
179
180/*
Mark Fasheh50af94b2007-01-21 14:44:59 -0800181 * backup superblock flag is used to indicate that this volume
182 * has backup superblocks.
183 */
184#define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001
185
Mark Fasheh328d5752007-06-18 10:48:04 -0700186/*
Joel Beckera9772182008-12-16 18:10:18 -0800187 * The filesystem will correctly handle journal feature bits.
188 */
189#define OCFS2_FEATURE_COMPAT_JBD2_SB 0x0002
190
191/*
Mark Fasheh328d5752007-06-18 10:48:04 -0700192 * Unwritten extents support.
193 */
194#define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001
195
Jan Kara1a224ad2008-08-20 15:43:36 +0200196/*
197 * Maintain quota information for this filesystem
198 */
199#define OCFS2_FEATURE_RO_COMPAT_USRQUOTA 0x0002
200#define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA 0x0004
201
Mark Fasheh50af94b2007-01-21 14:44:59 -0800202/* The byte offset of the first backup block will be 1G.
203 * The following will be 4G, 16G, 64G, 256G and 1T.
204 */
205#define OCFS2_BACKUP_SB_START 1 << 30
206
207/* the max backup superblock nums */
208#define OCFS2_MAX_BACKUP_SUPERBLOCKS 6
209
210/*
Mark Fasheh92e91ce2007-09-20 11:19:20 -0700211 * Flags on ocfs2_super_block.s_tunefs_flags
212 */
213#define OCFS2_TUNEFS_INPROG_REMOVE_SLOT 0x0001 /* Removing slots */
214
215/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800216 * Flags on ocfs2_dinode.i_flags
217 */
218#define OCFS2_VALID_FL (0x00000001) /* Inode is valid */
219#define OCFS2_UNUSED2_FL (0x00000002)
220#define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */
221#define OCFS2_UNUSED3_FL (0x00000008)
222/* System inode flags */
223#define OCFS2_SYSTEM_FL (0x00000010) /* System inode */
224#define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */
225#define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */
226#define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */
227#define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */
228#define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */
229#define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */
230#define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */
Jan Kara1a224ad2008-08-20 15:43:36 +0200231#define OCFS2_QUOTA_FL (0x00001000) /* Quota file */
Mark Fashehccd979b2005-12-15 14:31:24 -0800232
Mark Fasheh15b1e362007-09-07 13:58:15 -0700233/*
234 * Flags on ocfs2_dinode.i_dyn_features
235 *
236 * These can change much more often than i_flags. When adding flags,
237 * keep in mind that i_dyn_features is only 16 bits wide.
238 */
239#define OCFS2_INLINE_DATA_FL (0x0001) /* Data stored in inode block */
240#define OCFS2_HAS_XATTR_FL (0x0002)
241#define OCFS2_INLINE_XATTR_FL (0x0004)
242#define OCFS2_INDEXED_DIR_FL (0x0008)
Tao Ma721f69c2009-08-18 11:17:49 +0800243#define OCFS2_HAS_REFCOUNT_FL (0x0010)
Mark Fasheh15b1e362007-09-07 13:58:15 -0700244
Herbert Poetzlca4d1472006-07-03 17:27:12 -0700245/* Inode attributes, keep in sync with EXT2 */
Tao Ma0000b862010-09-19 13:42:29 +0800246#define OCFS2_SECRM_FL FS_SECRM_FL /* Secure deletion */
247#define OCFS2_UNRM_FL FS_UNRM_FL /* Undelete */
248#define OCFS2_COMPR_FL FS_COMPR_FL /* Compress file */
249#define OCFS2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
250#define OCFS2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
251#define OCFS2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
252#define OCFS2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
253#define OCFS2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
254/* Reserved for compression usage... */
255#define OCFS2_DIRTY_FL FS_DIRTY_FL
256#define OCFS2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
257#define OCFS2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
258#define OCFS2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
259/* End compression flags --- maybe not all used */
260#define OCFS2_BTREE_FL FS_BTREE_FL /* btree format dir */
261#define OCFS2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
262#define OCFS2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
263#define OCFS2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
264#define OCFS2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
265#define OCFS2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
266#define OCFS2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
267#define OCFS2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
Herbert Poetzlca4d1472006-07-03 17:27:12 -0700268
Tao Ma0000b862010-09-19 13:42:29 +0800269#define OCFS2_FL_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
270#define OCFS2_FL_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
Herbert Poetzlca4d1472006-07-03 17:27:12 -0700271
272/*
Mark Fashehe48edee2007-03-07 16:46:57 -0800273 * Extent record flags (e_node.leaf.flags)
274 */
Tao Ma721f69c2009-08-18 11:17:49 +0800275#define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
276 * unwritten */
277#define OCFS2_EXT_REFCOUNTED (0x02) /* Extent is reference
278 * counted in an associated
279 * refcount tree */
Mark Fashehe48edee2007-03-07 16:46:57 -0800280
281/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800282 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
283 */
284#define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */
285
286/*
287 * superblock s_state flags
288 */
289#define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */
290
291/* Limit of space in ocfs2_dir_entry */
292#define OCFS2_MAX_FILENAME_LEN 255
293
294/* Maximum slots on an ocfs2 file system */
295#define OCFS2_MAX_SLOTS 255
296
297/* Slot map indicator for an empty slot */
298#define OCFS2_INVALID_SLOT -1
299
300#define OCFS2_VOL_UUID_LEN 16
301#define OCFS2_MAX_VOL_LABEL_LEN 64
302
Sunil Mushran98f486f22010-10-09 10:24:46 -0700303/* The cluster stack fields */
Joel Beckerb61817e2008-02-01 15:08:23 -0800304#define OCFS2_STACK_LABEL_LEN 4
305#define OCFS2_CLUSTER_NAME_LEN 16
306
Sunil Mushran98f486f22010-10-09 10:24:46 -0700307/* Classic (historically speaking) cluster stack */
308#define OCFS2_CLASSIC_CLUSTER_STACK "o2cb"
309
Mark Fashehccd979b2005-12-15 14:31:24 -0800310/* Journal limits (in bytes) */
311#define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024)
Mark Fashehccd979b2005-12-15 14:31:24 -0800312
Sunil Mushran2fbe8d12007-12-20 14:58:11 -0800313/*
Tiger Yangfdd77702008-08-18 17:08:55 +0800314 * Inline extended attribute size (in bytes)
315 * The value chosen should be aligned to 16 byte boundaries.
316 */
317#define OCFS2_MIN_XATTR_INLINE_SIZE 256
318
Sunil Mushran98f486f22010-10-09 10:24:46 -0700319/*
320 * Cluster info flags (ocfs2_cluster_info.ci_stackflags)
321 */
322#define OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT (0x01)
323
Mark Fashehccd979b2005-12-15 14:31:24 -0800324struct ocfs2_system_inode_info {
325 char *si_name;
326 int si_iflags;
327 int si_mode;
328};
329
330/* System file index */
331enum {
332 BAD_BLOCK_SYSTEM_INODE = 0,
333 GLOBAL_INODE_ALLOC_SYSTEM_INODE,
334 SLOT_MAP_SYSTEM_INODE,
335#define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
336 HEARTBEAT_SYSTEM_INODE,
337 GLOBAL_BITMAP_SYSTEM_INODE,
Jan Kara1a224ad2008-08-20 15:43:36 +0200338 USER_QUOTA_SYSTEM_INODE,
339 GROUP_QUOTA_SYSTEM_INODE,
340#define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE
Tao Mab4d693f2010-08-16 16:58:21 +0800341#define OCFS2_FIRST_LOCAL_SYSTEM_INODE ORPHAN_DIR_SYSTEM_INODE
Mark Fashehccd979b2005-12-15 14:31:24 -0800342 ORPHAN_DIR_SYSTEM_INODE,
343 EXTENT_ALLOC_SYSTEM_INODE,
344 INODE_ALLOC_SYSTEM_INODE,
345 JOURNAL_SYSTEM_INODE,
346 LOCAL_ALLOC_SYSTEM_INODE,
347 TRUNCATE_LOG_SYSTEM_INODE,
Jan Kara1a224ad2008-08-20 15:43:36 +0200348 LOCAL_USER_QUOTA_SYSTEM_INODE,
349 LOCAL_GROUP_QUOTA_SYSTEM_INODE,
Tao Mab4d693f2010-08-16 16:58:21 +0800350#define OCFS2_LAST_LOCAL_SYSTEM_INODE LOCAL_GROUP_QUOTA_SYSTEM_INODE
Mark Fashehccd979b2005-12-15 14:31:24 -0800351 NUM_SYSTEM_INODES
352};
Tao Ma7d8f9872010-12-22 17:50:30 +0800353#define NUM_GLOBAL_SYSTEM_INODES OCFS2_FIRST_LOCAL_SYSTEM_INODE
Tao Mab4d693f2010-08-16 16:58:21 +0800354#define NUM_LOCAL_SYSTEM_INODES \
355 (NUM_SYSTEM_INODES - OCFS2_FIRST_LOCAL_SYSTEM_INODE)
Mark Fashehccd979b2005-12-15 14:31:24 -0800356
357static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
358 /* Global system inodes (single copy) */
359 /* The first two are only used from userspace mfks/tunefs */
360 [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 },
361 [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
362
363 /* These are used by the running filesystem */
364 [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 },
365 [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
366 [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 },
Jan Kara1a224ad2008-08-20 15:43:36 +0200367 [USER_QUOTA_SYSTEM_INODE] = { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 },
368 [GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group", OCFS2_QUOTA_FL, S_IFREG | 0644 },
Mark Fashehccd979b2005-12-15 14:31:24 -0800369
370 /* Slot-specific system inodes (one copy per slot) */
371 [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
372 [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
373 [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
374 [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
375 [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
Jan Kara1a224ad2008-08-20 15:43:36 +0200376 [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 },
377 [LOCAL_USER_QUOTA_SYSTEM_INODE] = { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
378 [LOCAL_GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
Mark Fashehccd979b2005-12-15 14:31:24 -0800379};
380
381/* Parameter passed from mount.ocfs2 to module */
382#define OCFS2_HB_NONE "heartbeat=none"
383#define OCFS2_HB_LOCAL "heartbeat=local"
Sunil Mushran2c442712010-10-07 15:23:50 -0700384#define OCFS2_HB_GLOBAL "heartbeat=global"
Mark Fashehccd979b2005-12-15 14:31:24 -0800385
386/*
387 * OCFS2 directory file types. Only the low 3 bits are used. The
388 * other bits are reserved for now.
389 */
390#define OCFS2_FT_UNKNOWN 0
391#define OCFS2_FT_REG_FILE 1
392#define OCFS2_FT_DIR 2
393#define OCFS2_FT_CHRDEV 3
394#define OCFS2_FT_BLKDEV 4
395#define OCFS2_FT_FIFO 5
396#define OCFS2_FT_SOCK 6
397#define OCFS2_FT_SYMLINK 7
398
399#define OCFS2_FT_MAX 8
400
401/*
402 * OCFS2_DIR_PAD defines the directory entries boundaries
403 *
404 * NOTE: It must be a multiple of 4
405 */
406#define OCFS2_DIR_PAD 4
407#define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1)
408#define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name)
409#define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \
410 OCFS2_DIR_ROUND) & \
411 ~OCFS2_DIR_ROUND)
Mark Fashehe7c17e42009-01-29 18:17:46 -0800412#define OCFS2_DIR_MIN_REC_LEN OCFS2_DIR_REC_LEN(1)
Mark Fashehccd979b2005-12-15 14:31:24 -0800413
414#define OCFS2_LINK_MAX 32000
Mark Fasheh198a1ca2008-11-20 17:54:57 -0800415#define OCFS2_DX_LINK_MAX ((1U << 31) - 1U)
416#define OCFS2_LINKS_HI_SHIFT 16
Mark Fashehe3a93c22009-02-17 15:29:35 -0800417#define OCFS2_DX_ENTRIES_MAX (0xffffffffU)
Mark Fashehccd979b2005-12-15 14:31:24 -0800418
419#define S_SHIFT 12
420static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
421 [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE,
422 [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR,
423 [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV,
424 [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV,
425 [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO,
426 [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
427 [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK,
428};
429
430
431/*
432 * Convenience casts
433 */
434#define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super))
435
436/*
Joel Beckerab552d52008-10-16 17:50:30 -0700437 * Block checking structure. This is used in metadata to validate the
438 * contents. If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all
439 * zeros.
440 */
441struct ocfs2_block_check {
442/*00*/ __le32 bc_crc32e; /* 802.3 Ethernet II CRC32 */
443 __le16 bc_ecc; /* Single-error-correction parity vector.
444 This is a simple Hamming code dependant
445 on the blocksize. OCFS2's maximum
446 blocksize, 4K, requires 16 parity bits,
447 so we fit in __le16. */
448 __le16 bc_reserved1;
449/*08*/
450};
451
452/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800453 * On disk extent record for OCFS2
454 * It describes a range of clusters on disk.
Mark Fashehe48edee2007-03-07 16:46:57 -0800455 *
456 * Length fields are divided into interior and leaf node versions.
457 * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
Mark Fashehccd979b2005-12-15 14:31:24 -0800458 */
459struct ocfs2_extent_rec {
460/*00*/ __le32 e_cpos; /* Offset into the file, in clusters */
Mark Fashehe48edee2007-03-07 16:46:57 -0800461 union {
462 __le32 e_int_clusters; /* Clusters covered by all children */
463 struct {
464 __le16 e_leaf_clusters; /* Clusters covered by this
465 extent */
466 __u8 e_reserved1;
467 __u8 e_flags; /* Extent flags */
468 };
469 };
Mark Fashehccd979b2005-12-15 14:31:24 -0800470 __le64 e_blkno; /* Physical disk offset, in blocks */
471/*10*/
472};
473
474struct ocfs2_chain_rec {
475 __le32 c_free; /* Number of free bits in this chain. */
476 __le32 c_total; /* Number of total bits in this chain */
477 __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
478};
479
480struct ocfs2_truncate_rec {
481 __le32 t_start; /* 1st cluster in this log */
482 __le32 t_clusters; /* Number of total clusters covered */
483};
484
485/*
486 * On disk extent list for OCFS2 (node in the tree). Note that this
487 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
488 * offsets are relative to ocfs2_dinode.id2.i_list or
489 * ocfs2_extent_block.h_list, respectively.
490 */
491struct ocfs2_extent_list {
492/*00*/ __le16 l_tree_depth; /* Extent tree depth from this
493 point. 0 means data extents
494 hang directly off this
Mark Fashehdcd05382007-01-16 11:32:23 -0800495 header (a leaf)
496 NOTE: The high 8 bits cannot be
497 used - tree_depth is never that big.
498 */
Mark Fashehccd979b2005-12-15 14:31:24 -0800499 __le16 l_count; /* Number of extent records */
500 __le16 l_next_free_rec; /* Next unused extent slot */
501 __le16 l_reserved1;
502 __le64 l_reserved2; /* Pad to
503 sizeof(ocfs2_extent_rec) */
504/*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */
505};
506
507/*
508 * On disk allocation chain list for OCFS2. Note that this is
509 * contained inside ocfs2_dinode, so the offsets are relative to
510 * ocfs2_dinode.id2.i_chain.
511 */
512struct ocfs2_chain_list {
513/*00*/ __le16 cl_cpg; /* Clusters per Block Group */
514 __le16 cl_bpc; /* Bits per cluster */
515 __le16 cl_count; /* Total chains in this list */
516 __le16 cl_next_free_rec; /* Next unused chain slot */
517 __le64 cl_reserved1;
518/*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */
519};
520
521/*
522 * On disk deallocation log for OCFS2. Note that this is
523 * contained inside ocfs2_dinode, so the offsets are relative to
524 * ocfs2_dinode.id2.i_dealloc.
525 */
526struct ocfs2_truncate_log {
527/*00*/ __le16 tl_count; /* Total records in this log */
528 __le16 tl_used; /* Number of records in use */
529 __le32 tl_reserved1;
530/*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */
531};
532
533/*
534 * On disk extent block (indirect block) for OCFS2
535 */
536struct ocfs2_extent_block
537{
538/*00*/ __u8 h_signature[8]; /* Signature for verification */
Joel Beckerab552d52008-10-16 17:50:30 -0700539 struct ocfs2_block_check h_check; /* Error checking */
Mark Fashehccd979b2005-12-15 14:31:24 -0800540/*10*/ __le16 h_suballoc_slot; /* Slot suballocator this
541 extent_header belongs to */
542 __le16 h_suballoc_bit; /* Bit offset in suballocator
543 block group */
544 __le32 h_fs_generation; /* Must match super block */
545 __le64 h_blkno; /* Offset on disk, in blocks */
Joel Becker9cbc0122010-03-26 10:07:42 +0800546/*20*/ __le64 h_suballoc_loc; /* Suballocator block group this
547 eb belongs to. Only valid
548 if allocated from a
549 discontiguous block group */
Mark Fashehccd979b2005-12-15 14:31:24 -0800550 __le64 h_next_leaf_blk; /* Offset on disk, in blocks,
551 of next leaf header pointing
552 to data */
553/*30*/ struct ocfs2_extent_list h_list; /* Extent record list */
554/* Actual on-disk size is one block */
555};
556
557/*
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800558 * On disk slot map for OCFS2. This defines the contents of the "slot_map"
Joel Becker386a2ef2008-02-01 12:06:54 -0800559 * system file. A slot is valid if it contains a node number >= 0. The
560 * value -1 (0xFFFF) is OCFS2_INVALID_SLOT. This marks a slot empty.
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800561 */
562struct ocfs2_slot_map {
563/*00*/ __le16 sm_slots[0];
564/*
565 * Actual on-disk size is one block. OCFS2_MAX_SLOTS is 255,
566 * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.
567 */
568};
569
Joel Becker386a2ef2008-02-01 12:06:54 -0800570struct ocfs2_extended_slot {
571/*00*/ __u8 es_valid;
572 __u8 es_reserved1[3];
573 __le32 es_node_num;
574/*10*/
575};
576
577/*
578 * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
579 * is set. It separates out the valid marker from the node number, and
580 * has room to grow. Unlike the old slot map, this format is defined by
581 * i_size.
582 */
583struct ocfs2_slot_map_extended {
584/*00*/ struct ocfs2_extended_slot se_slots[0];
585/*
586 * Actual size is i_size of the slot_map system file. It should
587 * match s_max_slots * sizeof(struct ocfs2_extended_slot)
588 */
589};
590
Sunil Mushran98f486f22010-10-09 10:24:46 -0700591/*
592 * ci_stackflags is only valid if the incompat bit
593 * OCFS2_FEATURE_INCOMPAT_CLUSTERINFO is set.
594 */
Joel Beckerb61817e2008-02-01 15:08:23 -0800595struct ocfs2_cluster_info {
596/*00*/ __u8 ci_stack[OCFS2_STACK_LABEL_LEN];
Sunil Mushran98f486f22010-10-09 10:24:46 -0700597 union {
598 __le32 ci_reserved;
599 struct {
600 __u8 ci_stackflags;
601 __u8 ci_reserved1;
602 __u8 ci_reserved2;
603 __u8 ci_reserved3;
604 };
605 };
Joel Beckerb61817e2008-02-01 15:08:23 -0800606/*08*/ __u8 ci_cluster[OCFS2_CLUSTER_NAME_LEN];
607/*18*/
608};
609
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800610/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800611 * On disk superblock for OCFS2
612 * Note that it is contained inside an ocfs2_dinode, so all offsets
613 * are relative to the start of ocfs2_dinode.id2.
614 */
615struct ocfs2_super_block {
616/*00*/ __le16 s_major_rev_level;
617 __le16 s_minor_rev_level;
618 __le16 s_mnt_count;
619 __le16 s_max_mnt_count;
620 __le16 s_state; /* File system state */
621 __le16 s_errors; /* Behaviour when detecting errors */
622 __le32 s_checkinterval; /* Max time between checks */
623/*10*/ __le64 s_lastcheck; /* Time of last check */
624 __le32 s_creator_os; /* OS */
625 __le32 s_feature_compat; /* Compatible feature set */
626/*20*/ __le32 s_feature_incompat; /* Incompatible feature set */
627 __le32 s_feature_ro_compat; /* Readonly-compatible feature set */
628 __le64 s_root_blkno; /* Offset, in blocks, of root directory
629 dinode */
630/*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system
631 directory dinode */
632 __le32 s_blocksize_bits; /* Blocksize for this fs */
633 __le32 s_clustersize_bits; /* Clustersize for this fs */
634/*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts
635 before tunefs required */
Mark Fasheh92e91ce2007-09-20 11:19:20 -0700636 __le16 s_tunefs_flag;
Tiger Yangcf1d6c72008-08-18 17:11:00 +0800637 __le32 s_uuid_hash; /* hash value of uuid */
Mark Fashehccd979b2005-12-15 14:31:24 -0800638 __le64 s_first_cluster_group; /* Block offset of 1st cluster
639 * group header */
640/*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
641/*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */
Sunil Mushran98f486f22010-10-09 10:24:46 -0700642/*A0*/ struct ocfs2_cluster_info s_cluster_info; /* Only valid if either
643 userspace or clusterinfo
644 INCOMPAT flag set. */
Tiger Yang8154da32008-08-18 17:11:46 +0800645/*B8*/ __le16 s_xattr_inline_size; /* extended attribute inline size
646 for this fs*/
647 __le16 s_reserved0;
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800648 __le32 s_dx_seed[3]; /* seed[0-2] for dx dir hash.
649 * s_uuid_hash serves as seed[3]. */
650/*C0*/ __le64 s_reserved2[15]; /* Fill out superblock */
Joel Beckerb61817e2008-02-01 15:08:23 -0800651/*140*/
652
653 /*
654 * NOTE: As stated above, all offsets are relative to
655 * ocfs2_dinode.id2, which is at 0xC0 in the inode.
656 * 0xC0 + 0x140 = 0x200 or 512 bytes. A superblock must fit within
657 * our smallest blocksize, which is 512 bytes. To ensure this,
658 * we reserve the space in s_reserved2. Anything past s_reserved2
659 * will not be available on the smallest blocksize.
660 */
Mark Fashehccd979b2005-12-15 14:31:24 -0800661};
662
663/*
664 * Local allocation bitmap for OCFS2 slots
665 * Note that it exists inside an ocfs2_dinode, so all offsets are
666 * relative to the start of ocfs2_dinode.id2.
667 */
668struct ocfs2_local_alloc
669{
670/*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */
671 __le16 la_size; /* Size of included bitmap, in bytes */
672 __le16 la_reserved1;
673 __le64 la_reserved2;
674/*10*/ __u8 la_bitmap[0];
675};
676
677/*
Mark Fasheh15b1e362007-09-07 13:58:15 -0700678 * Data-in-inode header. This is only used if i_dyn_features has
679 * OCFS2_INLINE_DATA_FL set.
680 */
681struct ocfs2_inline_data
682{
683/*00*/ __le16 id_count; /* Number of bytes that can be used
684 * for data, starting at id_data */
685 __le16 id_reserved0;
686 __le32 id_reserved1;
687 __u8 id_data[0]; /* Start of user data */
688};
689
690/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800691 * On disk inode for OCFS2
692 */
693struct ocfs2_dinode {
694/*00*/ __u8 i_signature[8]; /* Signature for validation */
695 __le32 i_generation; /* Generation number */
696 __le16 i_suballoc_slot; /* Slot suballocator this inode
697 belongs to */
698 __le16 i_suballoc_bit; /* Bit offset in suballocator
699 block group */
Mark Fasheh198a1ca2008-11-20 17:54:57 -0800700/*10*/ __le16 i_links_count_hi; /* High 16 bits of links count */
Tiger Yangfdd77702008-08-18 17:08:55 +0800701 __le16 i_xattr_inline_size;
Mark Fashehccd979b2005-12-15 14:31:24 -0800702 __le32 i_clusters; /* Cluster count */
703 __le32 i_uid; /* Owner UID */
704 __le32 i_gid; /* Owning GID */
705/*20*/ __le64 i_size; /* Size in bytes */
706 __le16 i_mode; /* File mode */
707 __le16 i_links_count; /* Links count */
708 __le32 i_flags; /* File flags */
709/*30*/ __le64 i_atime; /* Access time */
710 __le64 i_ctime; /* Creation time */
711/*40*/ __le64 i_mtime; /* Modification time */
712 __le64 i_dtime; /* Deletion time */
713/*50*/ __le64 i_blkno; /* Offset on disk, in blocks */
714 __le64 i_last_eb_blk; /* Pointer to last extent
715 block */
716/*60*/ __le32 i_fs_generation; /* Generation per fs-instance */
717 __le32 i_atime_nsec;
718 __le32 i_ctime_nsec;
719 __le32 i_mtime_nsec;
Tiger Yangfdd77702008-08-18 17:08:55 +0800720/*70*/ __le32 i_attr;
Tiger Yang50008632007-03-20 16:01:38 -0700721 __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL
722 was set in i_flags */
Mark Fasheh15b1e362007-09-07 13:58:15 -0700723 __le16 i_dyn_features;
Tiger Yangfdd77702008-08-18 17:08:55 +0800724 __le64 i_xattr_loc;
Joel Beckerab552d52008-10-16 17:50:30 -0700725/*80*/ struct ocfs2_block_check i_check; /* Error checking */
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800726/*88*/ __le64 i_dx_root; /* Pointer to dir index root block */
Tao Ma721f69c2009-08-18 11:17:49 +0800727/*90*/ __le64 i_refcount_loc;
Joel Becker9cbc0122010-03-26 10:07:42 +0800728 __le64 i_suballoc_loc; /* Suballocator block group this
729 inode belongs to. Only valid
730 if allocated from a
731 discontiguous block group */
732/*A0*/ __le64 i_reserved2[3];
Mark Fashehccd979b2005-12-15 14:31:24 -0800733/*B8*/ union {
734 __le64 i_pad1; /* Generic way to refer to this
735 64bit union */
736 struct {
737 __le64 i_rdev; /* Device number */
738 } dev1;
739 struct { /* Info for bitmap system
740 inodes */
741 __le32 i_used; /* Bits (ie, clusters) used */
742 __le32 i_total; /* Total bits (clusters)
743 available */
744 } bitmap1;
745 struct { /* Info for journal system
746 inodes */
747 __le32 ij_flags; /* Mounted, version, etc. */
Sunil Mushranc69991a2008-07-14 17:31:09 -0700748 __le32 ij_recovery_generation; /* Incremented when the
749 journal is recovered
750 after an unclean
751 shutdown */
Mark Fashehccd979b2005-12-15 14:31:24 -0800752 } journal1;
753 } id1; /* Inode type dependant 1 */
754/*C0*/ union {
755 struct ocfs2_super_block i_super;
756 struct ocfs2_local_alloc i_lab;
757 struct ocfs2_chain_list i_chain;
758 struct ocfs2_extent_list i_list;
759 struct ocfs2_truncate_log i_dealloc;
Mark Fasheh15b1e362007-09-07 13:58:15 -0700760 struct ocfs2_inline_data i_data;
Mark Fashehccd979b2005-12-15 14:31:24 -0800761 __u8 i_symlink[0];
762 } id2;
763/* Actual on-disk size is one block */
764};
765
766/*
767 * On-disk directory entry structure for OCFS2
768 *
769 * Packed as this structure could be accessed unaligned on 64-bit platforms
770 */
771struct ocfs2_dir_entry {
772/*00*/ __le64 inode; /* Inode number */
773 __le16 rec_len; /* Directory entry length */
774 __u8 name_len; /* Name length */
775 __u8 file_type;
776/*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */
777/* Actual on-disk length specified by rec_len */
778} __attribute__ ((packed));
779
780/*
Mark Fasheh87d35a72008-12-10 17:36:25 -0800781 * Per-block record for the unindexed directory btree. This is carefully
782 * crafted so that the rec_len and name_len records of an ocfs2_dir_entry are
783 * mirrored. That way, the directory manipulation code needs a minimal amount
784 * of update.
785 *
786 * NOTE: Keep this structure aligned to a multiple of 4 bytes.
787 */
788struct ocfs2_dir_block_trailer {
789/*00*/ __le64 db_compat_inode; /* Always zero. Was inode */
790
791 __le16 db_compat_rec_len; /* Backwards compatible with
792 * ocfs2_dir_entry. */
793 __u8 db_compat_name_len; /* Always zero. Was name_len */
794 __u8 db_reserved0;
795 __le16 db_reserved1;
796 __le16 db_free_rec_len; /* Size of largest empty hole
797 * in this block. (unused) */
798/*10*/ __u8 db_signature[8]; /* Signature for verification */
799 __le64 db_reserved2;
800 __le64 db_free_next; /* Next block in list (unused) */
801/*20*/ __le64 db_blkno; /* Offset on disk, in blocks */
802 __le64 db_parent_dinode; /* dinode which owns me, in
803 blocks */
Joel Beckerc175a512008-12-10 17:58:22 -0800804/*30*/ struct ocfs2_block_check db_check; /* Error checking */
Mark Fasheh87d35a72008-12-10 17:36:25 -0800805/*40*/
806};
807
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800808 /*
809 * A directory entry in the indexed tree. We don't store the full name here,
810 * but instead provide a pointer to the full dirent in the unindexed tree.
811 *
812 * We also store name_len here so as to reduce the number of leaf blocks we
813 * need to search in case of collisions.
814 */
815struct ocfs2_dx_entry {
816 __le32 dx_major_hash; /* Used to find logical
817 * cluster in index */
818 __le32 dx_minor_hash; /* Lower bits used to find
819 * block in cluster */
820 __le64 dx_dirent_blk; /* Physical block in unindexed
821 * tree holding this dirent. */
822};
823
824struct ocfs2_dx_entry_list {
825 __le32 de_reserved;
826 __le16 de_count; /* Maximum number of entries
827 * possible in de_entries */
828 __le16 de_num_used; /* Current number of
829 * de_entries entries */
830 struct ocfs2_dx_entry de_entries[0]; /* Indexed dir entries
831 * in a packed array of
832 * length de_num_used */
833};
834
Mark Fasheh4ed8a6b2008-11-24 17:02:08 -0800835#define OCFS2_DX_FLAG_INLINE 0x01
836
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800837/*
838 * A directory indexing block. Each indexed directory has one of these,
839 * pointed to by ocfs2_dinode.
840 *
841 * This block stores an indexed btree root, and a set of free space
842 * start-of-list pointers.
843 */
844struct ocfs2_dx_root_block {
845 __u8 dr_signature[8]; /* Signature for verification */
846 struct ocfs2_block_check dr_check; /* Error checking */
847 __le16 dr_suballoc_slot; /* Slot suballocator this
848 * block belongs to. */
849 __le16 dr_suballoc_bit; /* Bit offset in suballocator
850 * block group */
851 __le32 dr_fs_generation; /* Must match super block */
852 __le64 dr_blkno; /* Offset on disk, in blocks */
853 __le64 dr_last_eb_blk; /* Pointer to last
854 * extent block */
855 __le32 dr_clusters; /* Clusters allocated
856 * to the indexed tree. */
Mark Fasheh4ed8a6b2008-11-24 17:02:08 -0800857 __u8 dr_flags; /* OCFS2_DX_FLAG_* flags */
858 __u8 dr_reserved0;
859 __le16 dr_reserved1;
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800860 __le64 dr_dir_blkno; /* Pointer to parent inode */
Mark Fashehe3a93c22009-02-17 15:29:35 -0800861 __le32 dr_num_entries; /* Total number of
862 * names stored in
863 * this directory.*/
864 __le32 dr_reserved2;
Mark Fashehe7c17e42009-01-29 18:17:46 -0800865 __le64 dr_free_blk; /* Pointer to head of free
866 * unindexed block list. */
Joel Becker9cbc0122010-03-26 10:07:42 +0800867 __le64 dr_suballoc_loc; /* Suballocator block group
868 this root belongs to.
869 Only valid if allocated
870 from a discontiguous
871 block group */
872 __le64 dr_reserved3[14];
Mark Fasheh4ed8a6b2008-11-24 17:02:08 -0800873 union {
874 struct ocfs2_extent_list dr_list; /* Keep this aligned to 128
875 * bits for maximum space
876 * efficiency. */
877 struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of
878 * entries. We grow out
879 * to extents if this
880 * gets too big. */
881 };
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800882};
883
884/*
885 * The header of a leaf block in the indexed tree.
886 */
887struct ocfs2_dx_leaf {
888 __u8 dl_signature[8];/* Signature for verification */
889 struct ocfs2_block_check dl_check; /* Error checking */
890 __le64 dl_blkno; /* Offset on disk, in blocks */
891 __le32 dl_fs_generation;/* Must match super block */
892 __le32 dl_reserved0;
893 __le64 dl_reserved1;
894 struct ocfs2_dx_entry_list dl_list;
895};
896
Mark Fasheh87d35a72008-12-10 17:36:25 -0800897/*
Joel Becker4cbe4242010-04-13 14:26:12 +0800898 * Largest bitmap for a block (suballocator) group in bytes. This limit
899 * does not affect cluster groups (global allocator). Cluster group
900 * bitmaps run to the end of the block.
901 */
902#define OCFS2_MAX_BG_BITMAP_SIZE 256
903
904/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800905 * On disk allocator group structure for OCFS2
906 */
907struct ocfs2_group_desc
908{
909/*00*/ __u8 bg_signature[8]; /* Signature for validation */
910 __le16 bg_size; /* Size of included bitmap in
911 bytes. */
912 __le16 bg_bits; /* Bits represented by this
913 group. */
914 __le16 bg_free_bits_count; /* Free bits count */
915 __le16 bg_chain; /* What chain I am in. */
916/*10*/ __le32 bg_generation;
917 __le32 bg_reserved1;
918 __le64 bg_next_group; /* Next group in my list, in
919 blocks */
920/*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in
921 blocks */
922 __le64 bg_blkno; /* Offset on disk, in blocks */
Joel Beckerab552d52008-10-16 17:50:30 -0700923/*30*/ struct ocfs2_block_check bg_check; /* Error checking */
924 __le64 bg_reserved2;
Joel Becker4cbe4242010-04-13 14:26:12 +0800925/*40*/ union {
926 __u8 bg_bitmap[0];
927 struct {
928 /*
929 * Block groups may be discontiguous when
930 * OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG is set.
931 * The extents of a discontigous block group are
932 * stored in bg_list. It is a flat list.
933 * l_tree_depth must always be zero. A
934 * discontiguous group is signified by a non-zero
935 * bg_list->l_next_free_rec. Only block groups
936 * can be discontiguous; Cluster groups cannot.
937 * We've never made a block group with more than
938 * 2048 blocks (256 bytes of bg_bitmap). This
939 * codifies that limit so that we can fit bg_list.
940 * bg_size of a discontiguous block group will
941 * be 256 to match bg_bitmap_filler.
942 */
943 __u8 bg_bitmap_filler[OCFS2_MAX_BG_BITMAP_SIZE];
944/*140*/ struct ocfs2_extent_list bg_list;
945 };
946 };
947/* Actual on-disk size is one block */
Mark Fashehccd979b2005-12-15 14:31:24 -0800948};
949
Tao Ma721f69c2009-08-18 11:17:49 +0800950struct ocfs2_refcount_rec {
951/*00*/ __le64 r_cpos; /* Physical offset, in clusters */
952 __le32 r_clusters; /* Clusters covered by this extent */
953 __le32 r_refcount; /* Reference count of this extent */
954/*10*/
955};
Tao Mae73a8192009-08-11 14:33:14 +0800956#define OCFS2_32BIT_POS_MASK (0xffffffffULL)
Tao Ma721f69c2009-08-18 11:17:49 +0800957
958#define OCFS2_REFCOUNT_LEAF_FL (0x00000001)
959#define OCFS2_REFCOUNT_TREE_FL (0x00000002)
960
961struct ocfs2_refcount_list {
962/*00*/ __le16 rl_count; /* Maximum number of entries possible
963 in rl_records */
964 __le16 rl_used; /* Current number of used records */
965 __le32 rl_reserved2;
966 __le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */
967/*10*/ struct ocfs2_refcount_rec rl_recs[0]; /* Refcount records */
968};
969
970
971struct ocfs2_refcount_block {
972/*00*/ __u8 rf_signature[8]; /* Signature for verification */
973 __le16 rf_suballoc_slot; /* Slot suballocator this block
974 belongs to */
975 __le16 rf_suballoc_bit; /* Bit offset in suballocator
976 block group */
977 __le32 rf_fs_generation; /* Must match superblock */
978/*10*/ __le64 rf_blkno; /* Offset on disk, in blocks */
979 __le64 rf_parent; /* Parent block, only valid if
980 OCFS2_REFCOUNT_LEAF_FL is set in
981 rf_flags */
982/*20*/ struct ocfs2_block_check rf_check; /* Error checking */
983 __le64 rf_last_eb_blk; /* Pointer to last extent block */
984/*30*/ __le32 rf_count; /* Number of inodes sharing this
985 refcount tree */
986 __le32 rf_flags; /* See the flags above */
987 __le32 rf_clusters; /* clusters covered by refcount tree. */
988 __le32 rf_cpos; /* cluster offset in refcount tree.*/
989/*40*/ __le32 rf_generation; /* generation number. all be the same
990 * for the same refcount tree. */
991 __le32 rf_reserved0;
Joel Becker9cbc0122010-03-26 10:07:42 +0800992 __le64 rf_suballoc_loc; /* Suballocator block group this
993 refcount block belongs to. Only
994 valid if allocated from a
995 discontiguous block group */
996/*50*/ __le64 rf_reserved1[6];
Tao Ma721f69c2009-08-18 11:17:49 +0800997/*80*/ union {
998 struct ocfs2_refcount_list rf_records; /* List of refcount
999 records */
1000 struct ocfs2_extent_list rf_list; /* Extent record list,
1001 only valid if
1002 OCFS2_REFCOUNT_TREE_FL
1003 is set in rf_flags */
1004 };
1005/* Actual on-disk size is one block */
1006};
1007
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001008/*
1009 * On disk extended attribute structure for OCFS2.
1010 */
1011
1012/*
1013 * ocfs2_xattr_entry indicates one extend attribute.
1014 *
1015 * Note that it can be stored in inode, one block or one xattr bucket.
1016 */
1017struct ocfs2_xattr_entry {
1018 __le32 xe_name_hash; /* hash value of xattr prefix+suffix. */
Tao Ma8573f792008-10-24 22:24:17 +08001019 __le16 xe_name_offset; /* byte offset from the 1st entry in the
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001020 local xattr storage(inode, xattr block or
1021 xattr bucket). */
1022 __u8 xe_name_len; /* xattr name len, does't include prefix. */
Tao Ma8573f792008-10-24 22:24:17 +08001023 __u8 xe_type; /* the low 7 bits indicate the name prefix
1024 * type and the highest bit indicates whether
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001025 * the EA is stored in the local storage. */
1026 __le64 xe_value_size; /* real xattr value length. */
1027};
1028
1029/*
1030 * On disk structure for xattr header.
1031 *
1032 * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in
1033 * the local xattr storage.
1034 */
1035struct ocfs2_xattr_header {
1036 __le16 xh_count; /* contains the count of how
1037 many records are in the
1038 local xattr storage. */
Tao Ma0c044f02008-08-18 17:38:50 +08001039 __le16 xh_free_start; /* current offset for storing
1040 xattr. */
1041 __le16 xh_name_value_len; /* total length of name/value
1042 length in this bucket. */
Tao Ma8573f792008-10-24 22:24:17 +08001043 __le16 xh_num_buckets; /* Number of xattr buckets
1044 in this extent record,
1045 only valid in the first
1046 bucket. */
Joel Beckerab552d52008-10-16 17:50:30 -07001047 struct ocfs2_block_check xh_check; /* Error checking
1048 (Note, this is only
1049 used for xattr
1050 buckets. A block uses
1051 xb_check and sets
1052 this field to zero.) */
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001053 struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
1054};
1055
1056/*
1057 * On disk structure for xattr value root.
1058 *
Tao Ma8573f792008-10-24 22:24:17 +08001059 * When an xattr's value is large enough, it is stored in an external
1060 * b-tree like file data. The xattr value root points to this structure.
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001061 */
1062struct ocfs2_xattr_value_root {
1063/*00*/ __le32 xr_clusters; /* clusters covered by xattr value. */
1064 __le32 xr_reserved0;
1065 __le64 xr_last_eb_blk; /* Pointer to last extent block */
1066/*10*/ struct ocfs2_extent_list xr_list; /* Extent record list */
1067};
1068
1069/*
1070 * On disk structure for xattr tree root.
1071 *
1072 * It is used when there are too many extended attributes for one file. These
1073 * attributes will be organized and stored in an indexed-btree.
1074 */
1075struct ocfs2_xattr_tree_root {
1076/*00*/ __le32 xt_clusters; /* clusters covered by xattr. */
1077 __le32 xt_reserved0;
1078 __le64 xt_last_eb_blk; /* Pointer to last extent block */
1079/*10*/ struct ocfs2_extent_list xt_list; /* Extent record list */
1080};
1081
Tiger Yangcf1d6c72008-08-18 17:11:00 +08001082#define OCFS2_XATTR_INDEXED 0x1
1083#define OCFS2_HASH_SHIFT 5
1084#define OCFS2_XATTR_ROUND 3
1085#define OCFS2_XATTR_SIZE(size) (((size) + OCFS2_XATTR_ROUND) & \
1086 ~(OCFS2_XATTR_ROUND))
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001087
Tao Ma0c044f02008-08-18 17:38:50 +08001088#define OCFS2_XATTR_BUCKET_SIZE 4096
1089#define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET (OCFS2_XATTR_BUCKET_SIZE \
1090 / OCFS2_MIN_BLOCKSIZE)
1091
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001092/*
1093 * On disk structure for xattr block.
1094 */
1095struct ocfs2_xattr_block {
1096/*00*/ __u8 xb_signature[8]; /* Signature for verification */
1097 __le16 xb_suballoc_slot; /* Slot suballocator this
1098 block belongs to. */
1099 __le16 xb_suballoc_bit; /* Bit offset in suballocator
1100 block group */
1101 __le32 xb_fs_generation; /* Must match super block */
1102/*10*/ __le64 xb_blkno; /* Offset on disk, in blocks */
Joel Beckerab552d52008-10-16 17:50:30 -07001103 struct ocfs2_block_check xb_check; /* Error checking */
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001104/*20*/ __le16 xb_flags; /* Indicates whether this block contains
1105 real xattr or a xattr tree. */
1106 __le16 xb_reserved0;
1107 __le32 xb_reserved1;
Joel Becker9cbc0122010-03-26 10:07:42 +08001108 __le64 xb_suballoc_loc; /* Suballocator block group this
1109 xattr block belongs to. Only
1110 valid if allocated from a
1111 discontiguous block group */
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001112/*30*/ union {
1113 struct ocfs2_xattr_header xb_header; /* xattr header if this
1114 block contains xattr */
1115 struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this
1116 block cotains xattr
1117 tree. */
1118 } xb_attrs;
1119};
1120
1121#define OCFS2_XATTR_ENTRY_LOCAL 0x80
1122#define OCFS2_XATTR_TYPE_MASK 0x7F
1123static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe,
1124 int local)
1125{
1126 if (local)
1127 xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL;
1128 else
1129 xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL;
1130}
1131
1132static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe)
1133{
1134 return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL;
1135}
1136
1137static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type)
1138{
1139 xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK;
1140}
1141
1142static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe)
1143{
1144 return xe->xe_type & OCFS2_XATTR_TYPE_MASK;
1145}
1146
Jan Kara9e33d692008-08-25 19:56:50 +02001147/*
1148 * On disk structures for global quota file
1149 */
1150
1151/* Magic numbers and known versions for global quota files */
1152#define OCFS2_GLOBAL_QMAGICS {\
1153 0x0cf52470, /* USRQUOTA */ \
1154 0x0cf52471 /* GRPQUOTA */ \
1155}
1156
1157#define OCFS2_GLOBAL_QVERSIONS {\
1158 0, \
1159 0, \
1160}
1161
1162
1163/* Each block of each quota file has a certain fixed number of bytes reserved
1164 * for OCFS2 internal use at its end. OCFS2 can use it for things like
1165 * checksums, etc. */
1166#define OCFS2_QBLK_RESERVED_SPACE 8
1167
1168/* Generic header of all quota files */
1169struct ocfs2_disk_dqheader {
1170 __le32 dqh_magic; /* Magic number identifying file */
1171 __le32 dqh_version; /* Quota format version */
1172};
1173
1174#define OCFS2_GLOBAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))
1175
1176/* Information header of global quota file (immediately follows the generic
1177 * header) */
1178struct ocfs2_global_disk_dqinfo {
1179/*00*/ __le32 dqi_bgrace; /* Grace time for space softlimit excess */
1180 __le32 dqi_igrace; /* Grace time for inode softlimit excess */
1181 __le32 dqi_syncms; /* Time after which we sync local changes to
1182 * global quota file */
1183 __le32 dqi_blocks; /* Number of blocks in quota file */
1184/*10*/ __le32 dqi_free_blk; /* First free block in quota file */
1185 __le32 dqi_free_entry; /* First block with free dquot entry in quota
1186 * file */
1187};
1188
1189/* Structure with global user / group information. We reserve some space
1190 * for future use. */
1191struct ocfs2_global_disk_dqblk {
1192/*00*/ __le32 dqb_id; /* ID the structure belongs to */
1193 __le32 dqb_use_count; /* Number of nodes having reference to this structure */
1194 __le64 dqb_ihardlimit; /* absolute limit on allocated inodes */
1195/*10*/ __le64 dqb_isoftlimit; /* preferred inode limit */
1196 __le64 dqb_curinodes; /* current # allocated inodes */
1197/*20*/ __le64 dqb_bhardlimit; /* absolute limit on disk space */
1198 __le64 dqb_bsoftlimit; /* preferred limit on disk space */
1199/*30*/ __le64 dqb_curspace; /* current space occupied */
1200 __le64 dqb_btime; /* time limit for excessive disk use */
1201/*40*/ __le64 dqb_itime; /* time limit for excessive inode use */
1202 __le64 dqb_pad1;
1203/*50*/ __le64 dqb_pad2;
1204};
1205
1206/*
1207 * On-disk structures for local quota file
1208 */
1209
1210/* Magic numbers and known versions for local quota files */
1211#define OCFS2_LOCAL_QMAGICS {\
1212 0x0cf524c0, /* USRQUOTA */ \
1213 0x0cf524c1 /* GRPQUOTA */ \
1214}
1215
1216#define OCFS2_LOCAL_QVERSIONS {\
1217 0, \
1218 0, \
1219}
1220
1221/* Quota flags in dqinfo header */
1222#define OLQF_CLEAN 0x0001 /* Quota file is empty (this should be after\
1223 * quota has been cleanly turned off) */
1224
1225#define OCFS2_LOCAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))
1226
1227/* Information header of local quota file (immediately follows the generic
1228 * header) */
1229struct ocfs2_local_disk_dqinfo {
1230 __le32 dqi_flags; /* Flags for quota file */
1231 __le32 dqi_chunks; /* Number of chunks of quota structures
1232 * with a bitmap */
1233 __le32 dqi_blocks; /* Number of blocks allocated for quota file */
1234};
1235
1236/* Header of one chunk of a quota file */
1237struct ocfs2_local_disk_chunk {
1238 __le32 dqc_free; /* Number of free entries in the bitmap */
Coly Li93654542009-12-06 22:38:53 +08001239 __u8 dqc_bitmap[0]; /* Bitmap of entries in the corresponding
Jan Kara9e33d692008-08-25 19:56:50 +02001240 * chunk of quota file */
1241};
1242
1243/* One entry in local quota file */
1244struct ocfs2_local_disk_dqblk {
1245/*00*/ __le64 dqb_id; /* id this quota applies to */
1246 __le64 dqb_spacemod; /* Change in the amount of used space */
1247/*10*/ __le64 dqb_inodemod; /* Change in the amount of used inodes */
1248};
1249
Joel Beckerab552d52008-10-16 17:50:30 -07001250
1251/*
1252 * The quota trailer lives at the end of each quota block.
1253 */
1254
1255struct ocfs2_disk_dqtrailer {
1256/*00*/ struct ocfs2_block_check dq_check; /* Error checking */
1257/*08*/ /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */
1258};
1259
1260static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize,
1261 void *buf)
1262{
1263 char *ptr = buf;
1264 ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE;
1265
1266 return (struct ocfs2_disk_dqtrailer *)ptr;
1267}
1268
Mark Fashehccd979b2005-12-15 14:31:24 -08001269#ifdef __KERNEL__
1270static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
1271{
1272 return sb->s_blocksize -
1273 offsetof(struct ocfs2_dinode, id2.i_symlink);
1274}
1275
Tiger Yangfdd77702008-08-18 17:08:55 +08001276static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb,
1277 struct ocfs2_dinode *di)
1278{
1279 unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
1280
1281 if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
1282 return sb->s_blocksize -
1283 offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
1284 xattrsize;
1285 else
1286 return sb->s_blocksize -
1287 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
1288}
1289
Mark Fashehccd979b2005-12-15 14:31:24 -08001290static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
1291{
1292 int size;
1293
1294 size = sb->s_blocksize -
1295 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1296
1297 return size / sizeof(struct ocfs2_extent_rec);
1298}
1299
Tiger Yangfdd77702008-08-18 17:08:55 +08001300static inline int ocfs2_extent_recs_per_inode_with_xattr(
1301 struct super_block *sb,
1302 struct ocfs2_dinode *di)
1303{
1304 int size;
1305 unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
1306
1307 if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
1308 size = sb->s_blocksize -
1309 offsetof(struct ocfs2_dinode, id2.i_list.l_recs) -
1310 xattrsize;
1311 else
1312 size = sb->s_blocksize -
1313 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1314
1315 return size / sizeof(struct ocfs2_extent_rec);
1316}
1317
Mark Fasheh9b7895e2008-11-12 16:27:44 -08001318static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb)
1319{
1320 int size;
1321
1322 size = sb->s_blocksize -
1323 offsetof(struct ocfs2_dx_root_block, dr_list.l_recs);
1324
1325 return size / sizeof(struct ocfs2_extent_rec);
1326}
1327
Mark Fashehccd979b2005-12-15 14:31:24 -08001328static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
1329{
1330 int size;
1331
1332 size = sb->s_blocksize -
1333 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
1334
1335 return size / sizeof(struct ocfs2_chain_rec);
1336}
1337
1338static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
1339{
1340 int size;
1341
1342 size = sb->s_blocksize -
1343 offsetof(struct ocfs2_extent_block, h_list.l_recs);
1344
1345 return size / sizeof(struct ocfs2_extent_rec);
1346}
1347
Joel Becker798db352010-04-13 14:26:32 +08001348static inline u16 ocfs2_extent_recs_per_gd(struct super_block *sb)
1349{
1350 int size;
1351
1352 size = sb->s_blocksize -
1353 offsetof(struct ocfs2_group_desc, bg_list.l_recs);
1354
1355 return size / sizeof(struct ocfs2_extent_rec);
1356}
1357
Mark Fasheh9b7895e2008-11-12 16:27:44 -08001358static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb)
1359{
1360 int size;
1361
1362 size = sb->s_blocksize -
1363 offsetof(struct ocfs2_dx_leaf, dl_list.de_entries);
1364
1365 return size / sizeof(struct ocfs2_dx_entry);
1366}
1367
Mark Fasheh4ed8a6b2008-11-24 17:02:08 -08001368static inline int ocfs2_dx_entries_per_root(struct super_block *sb)
1369{
1370 int size;
1371
1372 size = sb->s_blocksize -
1373 offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries);
1374
1375 return size / sizeof(struct ocfs2_dx_entry);
1376}
1377
Mark Fashehccd979b2005-12-15 14:31:24 -08001378static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
1379{
1380 u16 size;
1381
1382 size = sb->s_blocksize -
1383 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
1384
1385 return size;
1386}
1387
Joel Becker4cbe4242010-04-13 14:26:12 +08001388static inline int ocfs2_group_bitmap_size(struct super_block *sb,
Tao Ma85718822010-04-13 14:38:06 +08001389 int suballocator,
1390 u32 feature_incompat)
Mark Fashehccd979b2005-12-15 14:31:24 -08001391{
Tao Ma85718822010-04-13 14:38:06 +08001392 int size = sb->s_blocksize -
1393 offsetof(struct ocfs2_group_desc, bg_bitmap);
Mark Fashehccd979b2005-12-15 14:31:24 -08001394
Tao Ma85718822010-04-13 14:38:06 +08001395 /*
1396 * The cluster allocator uses the entire block. Suballocators have
1397 * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older
1398 * code expects bg_size set to the maximum. Thus we must keep
1399 * bg_size as-is unless discontig_bg is enabled.
1400 */
1401 if (suballocator &&
1402 (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG))
Joel Becker4cbe4242010-04-13 14:26:12 +08001403 size = OCFS2_MAX_BG_BITMAP_SIZE;
Mark Fashehccd979b2005-12-15 14:31:24 -08001404
1405 return size;
1406}
1407
1408static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
1409{
1410 int size;
1411
1412 size = sb->s_blocksize -
1413 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
1414
1415 return size / sizeof(struct ocfs2_truncate_rec);
1416}
Mark Fasheh50af94b2007-01-21 14:44:59 -08001417
1418static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
1419{
1420 u64 offset = OCFS2_BACKUP_SB_START;
1421
1422 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
1423 offset <<= (2 * index);
Mark Fasheha8a75a22007-01-26 10:46:59 -08001424 offset >>= sb->s_blocksize_bits;
Mark Fasheh50af94b2007-01-21 14:44:59 -08001425 return offset;
1426 }
1427
1428 return 0;
1429
1430}
Tao Ma0c044f02008-08-18 17:38:50 +08001431
1432static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)
1433{
1434 int size;
1435
1436 size = sb->s_blocksize -
1437 offsetof(struct ocfs2_xattr_block,
1438 xb_attrs.xb_root.xt_list.l_recs);
1439
1440 return size / sizeof(struct ocfs2_extent_rec);
1441}
Tao Ma721f69c2009-08-18 11:17:49 +08001442
1443static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb)
1444{
1445 int size;
1446
1447 size = sb->s_blocksize -
1448 offsetof(struct ocfs2_refcount_block, rf_list.l_recs);
1449
1450 return size / sizeof(struct ocfs2_extent_rec);
1451}
1452
1453static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb)
1454{
1455 int size;
1456
1457 size = sb->s_blocksize -
1458 offsetof(struct ocfs2_refcount_block, rf_records.rl_recs);
1459
1460 return size / sizeof(struct ocfs2_refcount_rec);
1461}
Tao Mae73a8192009-08-11 14:33:14 +08001462
1463static inline u32
1464ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec *rec)
1465{
1466 return le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1467}
Mark Fashehccd979b2005-12-15 14:31:24 -08001468#else
1469static inline int ocfs2_fast_symlink_chars(int blocksize)
1470{
1471 return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
1472}
1473
Tao Ma1097df32010-01-20 11:31:11 +08001474static inline int ocfs2_max_inline_data_with_xattr(int blocksize,
1475 struct ocfs2_dinode *di)
Mark Fasheh15b1e362007-09-07 13:58:15 -07001476{
Tao Ma1097df32010-01-20 11:31:11 +08001477 if (di && (di->i_dyn_features & OCFS2_INLINE_XATTR_FL))
1478 return blocksize -
1479 offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
1480 di->i_xattr_inline_size;
1481 else
1482 return blocksize -
1483 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
Mark Fasheh15b1e362007-09-07 13:58:15 -07001484}
1485
Mark Fashehccd979b2005-12-15 14:31:24 -08001486static inline int ocfs2_extent_recs_per_inode(int blocksize)
1487{
1488 int size;
1489
1490 size = blocksize -
1491 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1492
1493 return size / sizeof(struct ocfs2_extent_rec);
1494}
1495
1496static inline int ocfs2_chain_recs_per_inode(int blocksize)
1497{
1498 int size;
1499
1500 size = blocksize -
1501 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
1502
1503 return size / sizeof(struct ocfs2_chain_rec);
1504}
1505
1506static inline int ocfs2_extent_recs_per_eb(int blocksize)
1507{
1508 int size;
1509
1510 size = blocksize -
1511 offsetof(struct ocfs2_extent_block, h_list.l_recs);
1512
1513 return size / sizeof(struct ocfs2_extent_rec);
1514}
1515
Joel Becker798db352010-04-13 14:26:32 +08001516static inline int ocfs2_extent_recs_per_gd(int blocksize)
1517{
1518 int size;
1519
1520 size = blocksize -
1521 offsetof(struct ocfs2_group_desc, bg_list.l_recs);
1522
1523 return size / sizeof(struct ocfs2_extent_rec);
1524}
1525
Mark Fashehccd979b2005-12-15 14:31:24 -08001526static inline int ocfs2_local_alloc_size(int blocksize)
1527{
1528 int size;
1529
1530 size = blocksize -
1531 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
1532
1533 return size;
1534}
1535
Tao Ma85718822010-04-13 14:38:06 +08001536static inline int ocfs2_group_bitmap_size(int blocksize,
1537 int suballocator,
1538 uint32_t feature_incompat)
Mark Fashehccd979b2005-12-15 14:31:24 -08001539{
Tao Ma85718822010-04-13 14:38:06 +08001540 int size = sb->s_blocksize -
1541 offsetof(struct ocfs2_group_desc, bg_bitmap);
Mark Fashehccd979b2005-12-15 14:31:24 -08001542
Tao Ma85718822010-04-13 14:38:06 +08001543 /*
1544 * The cluster allocator uses the entire block. Suballocators have
1545 * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older
1546 * code expects bg_size set to the maximum. Thus we must keep
1547 * bg_size as-is unless discontig_bg is enabled.
1548 */
1549 if (suballocator &&
1550 (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG))
Joel Becker4cbe4242010-04-13 14:26:12 +08001551 size = OCFS2_MAX_BG_BITMAP_SIZE;
Mark Fashehccd979b2005-12-15 14:31:24 -08001552
1553 return size;
1554}
1555
1556static inline int ocfs2_truncate_recs_per_inode(int blocksize)
1557{
1558 int size;
1559
1560 size = blocksize -
1561 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
1562
1563 return size / sizeof(struct ocfs2_truncate_rec);
1564}
Mark Fasheh50af94b2007-01-21 14:44:59 -08001565
1566static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
1567{
1568 uint64_t offset = OCFS2_BACKUP_SB_START;
1569
1570 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
1571 offset <<= (2 * index);
1572 offset /= blocksize;
1573 return offset;
1574 }
1575
1576 return 0;
1577}
Tao Ma0c044f02008-08-18 17:38:50 +08001578
1579static inline int ocfs2_xattr_recs_per_xb(int blocksize)
1580{
1581 int size;
1582
1583 size = blocksize -
1584 offsetof(struct ocfs2_xattr_block,
1585 xb_attrs.xb_root.xt_list.l_recs);
1586
1587 return size / sizeof(struct ocfs2_extent_rec);
1588}
Mark Fashehccd979b2005-12-15 14:31:24 -08001589#endif /* __KERNEL__ */
1590
1591
1592static inline int ocfs2_system_inode_is_global(int type)
1593{
1594 return ((type >= 0) &&
1595 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
1596}
1597
1598static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
1599 int type, int slot)
1600{
1601 int chars;
1602
1603 /*
1604 * Global system inodes can only have one copy. Everything
1605 * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
1606 * list has a copy per slot.
1607 */
1608 if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
Joel Beckerfe9f3872008-06-12 22:39:18 -07001609 chars = snprintf(buf, len, "%s",
Mark Fashehccd979b2005-12-15 14:31:24 -08001610 ocfs2_system_inodes[type].si_name);
1611 else
1612 chars = snprintf(buf, len,
1613 ocfs2_system_inodes[type].si_name,
1614 slot);
1615
1616 return chars;
1617}
1618
1619static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
1620 umode_t mode)
1621{
1622 de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
1623}
1624
Tao Maaf2bf0d2010-05-17 15:14:17 +08001625static inline int ocfs2_gd_is_discontig(struct ocfs2_group_desc *gd)
1626{
1627 if ((offsetof(struct ocfs2_group_desc, bg_bitmap) +
1628 le16_to_cpu(gd->bg_size)) !=
1629 offsetof(struct ocfs2_group_desc, bg_list))
1630 return 0;
1631 /*
1632 * Only valid to check l_next_free_rec if
1633 * bg_bitmap + bg_size == bg_list.
1634 */
1635 if (!gd->bg_list.l_next_free_rec)
1636 return 0;
1637 return 1;
1638}
Mark Fashehccd979b2005-12-15 14:31:24 -08001639#endif /* _OCFS2_FS_H */
1640