blob: 540ab5b75dbb057b99f5d879edb703c4b18afe9c [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 \
Mark Fasheh18d585f2015-03-12 16:25:46 -0700105 | OCFS2_FEATURE_INCOMPAT_CLUSTERINFO \
106 | OCFS2_FEATURE_INCOMPAT_APPEND_DIO)
Jan Kara19ece542008-08-21 20:13:17 +0200107#define OCFS2_FEATURE_RO_COMPAT_SUPP (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \
108 | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \
Mark Fasheh18d585f2015-03-12 16:25:46 -0700109 | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
Mark Fashehccd979b2005-12-15 14:31:24 -0800110
111/*
112 * Heartbeat-only devices are missing journals and other files. The
113 * filesystem driver can't load them, but the library can. Never put
114 * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
115 */
116#define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002
117
Mark Fasheh89039012006-12-07 18:05:37 -0800118/*
119 * tunefs sets this incompat flag before starting the resize and clears it
120 * at the end. This flag protects users from inadvertently mounting the fs
121 * after an aborted run without fsck-ing.
122 */
123#define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004
Mark Fashehccd979b2005-12-15 14:31:24 -0800124
Sunil Mushranc271c5c2006-12-05 17:56:35 -0800125/* Used to denote a non-clustered volume */
126#define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008
127
Mark Fasheh89039012006-12-07 18:05:37 -0800128/* Support for sparse allocation in b-trees */
129#define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010
130
Mark Fashehccd979b2005-12-15 14:31:24 -0800131/*
Mark Fasheh92e91ce2007-09-20 11:19:20 -0700132 * Tunefs sets this incompat flag before starting an operation which
133 * would require cleanup on abort. This is done to protect users from
134 * inadvertently mounting the fs after an aborted run without
135 * fsck-ing.
136 *
137 * s_tunefs_flags on the super block describes precisely which
138 * operations were in progress.
139 */
140#define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG 0x0020
141
Mark Fasheh15b1e362007-09-07 13:58:15 -0700142/* Support for data packed into inode blocks */
143#define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040
144
Mark Fasheh92e91ce2007-09-20 11:19:20 -0700145/*
Joel Beckerb61817e2008-02-01 15:08:23 -0800146 * Support for alternate, userspace cluster stacks. If set, the superblock
147 * field s_cluster_info contains a tag for the alternate stack in use as
148 * well as the name of the cluster being joined.
149 * mount.ocfs2 must pass in a matching stack name.
150 *
151 * If not set, the classic stack will be used. This is compatbile with
152 * all older versions.
153 */
154#define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK 0x0080
155
Tiger Yang8154da32008-08-18 17:11:46 +0800156/* Support for the extended slot map */
157#define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100
158
159/* Support for extended attributes */
160#define OCFS2_FEATURE_INCOMPAT_XATTR 0x0200
161
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800162/* Support for indexed directores */
163#define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS 0x0400
164
Joel Beckerab552d52008-10-16 17:50:30 -0700165/* Metadata checksum and error correction */
166#define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800
167
Tao Ma721f69c2009-08-18 11:17:49 +0800168/* Refcount tree support */
169#define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000
170
Masahiro Yamadae1c05062015-07-07 10:14:59 +0900171/* Discontiguous block groups */
Joel Becker4cbe4242010-04-13 14:26:12 +0800172#define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG 0x2000
173
Joel Beckerb61817e2008-02-01 15:08:23 -0800174/*
Sunil Mushran98f486f22010-10-09 10:24:46 -0700175 * Incompat bit to indicate useable clusterinfo with stackflags for all
176 * cluster stacks (userspace adnd o2cb). If this bit is set,
177 * INCOMPAT_USERSPACE_STACK becomes superfluous and thus should not be set.
178 */
179#define OCFS2_FEATURE_INCOMPAT_CLUSTERINFO 0x4000
180
181/*
Mark Fasheh18d585f2015-03-12 16:25:46 -0700182 * Append Direct IO support
183 */
184#define OCFS2_FEATURE_INCOMPAT_APPEND_DIO 0x8000
185
186/*
Mark Fasheh50af94b2007-01-21 14:44:59 -0800187 * backup superblock flag is used to indicate that this volume
188 * has backup superblocks.
189 */
190#define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001
191
Mark Fasheh328d5752007-06-18 10:48:04 -0700192/*
Joel Beckera9772182008-12-16 18:10:18 -0800193 * The filesystem will correctly handle journal feature bits.
194 */
195#define OCFS2_FEATURE_COMPAT_JBD2_SB 0x0002
196
197/*
Mark Fasheh328d5752007-06-18 10:48:04 -0700198 * Unwritten extents support.
199 */
200#define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001
201
Jan Kara1a224ad2008-08-20 15:43:36 +0200202/*
203 * Maintain quota information for this filesystem
204 */
205#define OCFS2_FEATURE_RO_COMPAT_USRQUOTA 0x0002
206#define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA 0x0004
207
Joseph Qi160cc262015-02-16 16:00:15 -0800208
Mark Fasheh50af94b2007-01-21 14:44:59 -0800209/* The byte offset of the first backup block will be 1G.
210 * The following will be 4G, 16G, 64G, 256G and 1T.
211 */
212#define OCFS2_BACKUP_SB_START 1 << 30
213
214/* the max backup superblock nums */
215#define OCFS2_MAX_BACKUP_SUPERBLOCKS 6
216
217/*
Mark Fasheh92e91ce2007-09-20 11:19:20 -0700218 * Flags on ocfs2_super_block.s_tunefs_flags
219 */
220#define OCFS2_TUNEFS_INPROG_REMOVE_SLOT 0x0001 /* Removing slots */
221
222/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800223 * Flags on ocfs2_dinode.i_flags
224 */
225#define OCFS2_VALID_FL (0x00000001) /* Inode is valid */
226#define OCFS2_UNUSED2_FL (0x00000002)
227#define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */
228#define OCFS2_UNUSED3_FL (0x00000008)
229/* System inode flags */
230#define OCFS2_SYSTEM_FL (0x00000010) /* System inode */
231#define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */
232#define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */
233#define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */
234#define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */
235#define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */
236#define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */
237#define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */
Jan Kara1a224ad2008-08-20 15:43:36 +0200238#define OCFS2_QUOTA_FL (0x00001000) /* Quota file */
Joseph Qi06ee5c72015-02-16 15:59:54 -0800239#define OCFS2_DIO_ORPHANED_FL (0X00002000) /* On the orphan list especially
240 * for dio */
Mark Fashehccd979b2005-12-15 14:31:24 -0800241
Mark Fasheh15b1e362007-09-07 13:58:15 -0700242/*
243 * Flags on ocfs2_dinode.i_dyn_features
244 *
245 * These can change much more often than i_flags. When adding flags,
246 * keep in mind that i_dyn_features is only 16 bits wide.
247 */
248#define OCFS2_INLINE_DATA_FL (0x0001) /* Data stored in inode block */
249#define OCFS2_HAS_XATTR_FL (0x0002)
250#define OCFS2_INLINE_XATTR_FL (0x0004)
251#define OCFS2_INDEXED_DIR_FL (0x0008)
Tao Ma721f69c2009-08-18 11:17:49 +0800252#define OCFS2_HAS_REFCOUNT_FL (0x0010)
Mark Fasheh15b1e362007-09-07 13:58:15 -0700253
Herbert Poetzlca4d1472006-07-03 17:27:12 -0700254/* Inode attributes, keep in sync with EXT2 */
Tao Ma0000b862010-09-19 13:42:29 +0800255#define OCFS2_SECRM_FL FS_SECRM_FL /* Secure deletion */
256#define OCFS2_UNRM_FL FS_UNRM_FL /* Undelete */
257#define OCFS2_COMPR_FL FS_COMPR_FL /* Compress file */
258#define OCFS2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
259#define OCFS2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
260#define OCFS2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
261#define OCFS2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
262#define OCFS2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
263/* Reserved for compression usage... */
264#define OCFS2_DIRTY_FL FS_DIRTY_FL
265#define OCFS2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
266#define OCFS2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
267#define OCFS2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
268/* End compression flags --- maybe not all used */
269#define OCFS2_BTREE_FL FS_BTREE_FL /* btree format dir */
270#define OCFS2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
271#define OCFS2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
272#define OCFS2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
273#define OCFS2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
274#define OCFS2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
275#define OCFS2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
276#define OCFS2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
Herbert Poetzlca4d1472006-07-03 17:27:12 -0700277
Tao Ma0000b862010-09-19 13:42:29 +0800278#define OCFS2_FL_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
279#define OCFS2_FL_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
Herbert Poetzlca4d1472006-07-03 17:27:12 -0700280
281/*
Mark Fashehe48edee2007-03-07 16:46:57 -0800282 * Extent record flags (e_node.leaf.flags)
283 */
Tao Ma721f69c2009-08-18 11:17:49 +0800284#define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
285 * unwritten */
286#define OCFS2_EXT_REFCOUNTED (0x02) /* Extent is reference
287 * counted in an associated
288 * refcount tree */
Mark Fashehe48edee2007-03-07 16:46:57 -0800289
290/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800291 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
292 */
293#define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */
294
295/*
296 * superblock s_state flags
297 */
298#define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */
299
300/* Limit of space in ocfs2_dir_entry */
301#define OCFS2_MAX_FILENAME_LEN 255
302
303/* Maximum slots on an ocfs2 file system */
304#define OCFS2_MAX_SLOTS 255
305
306/* Slot map indicator for an empty slot */
307#define OCFS2_INVALID_SLOT -1
308
309#define OCFS2_VOL_UUID_LEN 16
310#define OCFS2_MAX_VOL_LABEL_LEN 64
311
Sunil Mushran98f486f22010-10-09 10:24:46 -0700312/* The cluster stack fields */
Joel Beckerb61817e2008-02-01 15:08:23 -0800313#define OCFS2_STACK_LABEL_LEN 4
314#define OCFS2_CLUSTER_NAME_LEN 16
315
Sunil Mushran98f486f22010-10-09 10:24:46 -0700316/* Classic (historically speaking) cluster stack */
317#define OCFS2_CLASSIC_CLUSTER_STACK "o2cb"
318
Mark Fashehccd979b2005-12-15 14:31:24 -0800319/* Journal limits (in bytes) */
320#define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024)
Mark Fashehccd979b2005-12-15 14:31:24 -0800321
Sunil Mushran2fbe8d12007-12-20 14:58:11 -0800322/*
Tiger Yangfdd77702008-08-18 17:08:55 +0800323 * Inline extended attribute size (in bytes)
324 * The value chosen should be aligned to 16 byte boundaries.
325 */
326#define OCFS2_MIN_XATTR_INLINE_SIZE 256
327
Sunil Mushran98f486f22010-10-09 10:24:46 -0700328/*
329 * Cluster info flags (ocfs2_cluster_info.ci_stackflags)
330 */
331#define OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT (0x01)
332
Mark Fashehccd979b2005-12-15 14:31:24 -0800333struct ocfs2_system_inode_info {
334 char *si_name;
335 int si_iflags;
336 int si_mode;
337};
338
339/* System file index */
340enum {
341 BAD_BLOCK_SYSTEM_INODE = 0,
342 GLOBAL_INODE_ALLOC_SYSTEM_INODE,
343 SLOT_MAP_SYSTEM_INODE,
344#define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
345 HEARTBEAT_SYSTEM_INODE,
346 GLOBAL_BITMAP_SYSTEM_INODE,
Jan Kara1a224ad2008-08-20 15:43:36 +0200347 USER_QUOTA_SYSTEM_INODE,
348 GROUP_QUOTA_SYSTEM_INODE,
349#define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE
Tao Mab4d693f2010-08-16 16:58:21 +0800350#define OCFS2_FIRST_LOCAL_SYSTEM_INODE ORPHAN_DIR_SYSTEM_INODE
Mark Fashehccd979b2005-12-15 14:31:24 -0800351 ORPHAN_DIR_SYSTEM_INODE,
352 EXTENT_ALLOC_SYSTEM_INODE,
353 INODE_ALLOC_SYSTEM_INODE,
354 JOURNAL_SYSTEM_INODE,
355 LOCAL_ALLOC_SYSTEM_INODE,
356 TRUNCATE_LOG_SYSTEM_INODE,
Jan Kara1a224ad2008-08-20 15:43:36 +0200357 LOCAL_USER_QUOTA_SYSTEM_INODE,
358 LOCAL_GROUP_QUOTA_SYSTEM_INODE,
Tao Mab4d693f2010-08-16 16:58:21 +0800359#define OCFS2_LAST_LOCAL_SYSTEM_INODE LOCAL_GROUP_QUOTA_SYSTEM_INODE
Mark Fashehccd979b2005-12-15 14:31:24 -0800360 NUM_SYSTEM_INODES
361};
Tao Ma7d8f9872010-12-22 17:50:30 +0800362#define NUM_GLOBAL_SYSTEM_INODES OCFS2_FIRST_LOCAL_SYSTEM_INODE
Tao Mab4d693f2010-08-16 16:58:21 +0800363#define NUM_LOCAL_SYSTEM_INODES \
364 (NUM_SYSTEM_INODES - OCFS2_FIRST_LOCAL_SYSTEM_INODE)
Mark Fashehccd979b2005-12-15 14:31:24 -0800365
366static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
367 /* Global system inodes (single copy) */
368 /* The first two are only used from userspace mfks/tunefs */
369 [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 },
370 [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
371
372 /* These are used by the running filesystem */
373 [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 },
374 [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
375 [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 },
Jan Kara1a224ad2008-08-20 15:43:36 +0200376 [USER_QUOTA_SYSTEM_INODE] = { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 },
377 [GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group", OCFS2_QUOTA_FL, S_IFREG | 0644 },
Mark Fashehccd979b2005-12-15 14:31:24 -0800378
379 /* Slot-specific system inodes (one copy per slot) */
380 [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
381 [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
382 [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
383 [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
384 [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
Jan Kara1a224ad2008-08-20 15:43:36 +0200385 [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 },
386 [LOCAL_USER_QUOTA_SYSTEM_INODE] = { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
387 [LOCAL_GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
Mark Fashehccd979b2005-12-15 14:31:24 -0800388};
389
390/* Parameter passed from mount.ocfs2 to module */
391#define OCFS2_HB_NONE "heartbeat=none"
392#define OCFS2_HB_LOCAL "heartbeat=local"
Sunil Mushran2c442712010-10-07 15:23:50 -0700393#define OCFS2_HB_GLOBAL "heartbeat=global"
Mark Fashehccd979b2005-12-15 14:31:24 -0800394
395/*
396 * OCFS2 directory file types. Only the low 3 bits are used. The
397 * other bits are reserved for now.
398 */
399#define OCFS2_FT_UNKNOWN 0
400#define OCFS2_FT_REG_FILE 1
401#define OCFS2_FT_DIR 2
402#define OCFS2_FT_CHRDEV 3
403#define OCFS2_FT_BLKDEV 4
404#define OCFS2_FT_FIFO 5
405#define OCFS2_FT_SOCK 6
406#define OCFS2_FT_SYMLINK 7
407
408#define OCFS2_FT_MAX 8
409
410/*
411 * OCFS2_DIR_PAD defines the directory entries boundaries
412 *
413 * NOTE: It must be a multiple of 4
414 */
415#define OCFS2_DIR_PAD 4
416#define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1)
417#define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name)
418#define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \
419 OCFS2_DIR_ROUND) & \
420 ~OCFS2_DIR_ROUND)
Mark Fashehe7c17e42009-01-29 18:17:46 -0800421#define OCFS2_DIR_MIN_REC_LEN OCFS2_DIR_REC_LEN(1)
Mark Fashehccd979b2005-12-15 14:31:24 -0800422
423#define OCFS2_LINK_MAX 32000
Mark Fasheh198a1ca2008-11-20 17:54:57 -0800424#define OCFS2_DX_LINK_MAX ((1U << 31) - 1U)
425#define OCFS2_LINKS_HI_SHIFT 16
Mark Fashehe3a93c22009-02-17 15:29:35 -0800426#define OCFS2_DX_ENTRIES_MAX (0xffffffffU)
Mark Fashehccd979b2005-12-15 14:31:24 -0800427
428#define S_SHIFT 12
429static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
430 [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE,
431 [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR,
432 [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV,
433 [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV,
434 [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO,
435 [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
436 [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK,
437};
438
439
440/*
441 * Convenience casts
442 */
443#define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super))
444
445/*
Joel Beckerab552d52008-10-16 17:50:30 -0700446 * Block checking structure. This is used in metadata to validate the
447 * contents. If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all
448 * zeros.
449 */
450struct ocfs2_block_check {
451/*00*/ __le32 bc_crc32e; /* 802.3 Ethernet II CRC32 */
452 __le16 bc_ecc; /* Single-error-correction parity vector.
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300453 This is a simple Hamming code dependent
Joel Beckerab552d52008-10-16 17:50:30 -0700454 on the blocksize. OCFS2's maximum
455 blocksize, 4K, requires 16 parity bits,
456 so we fit in __le16. */
457 __le16 bc_reserved1;
458/*08*/
459};
460
461/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800462 * On disk extent record for OCFS2
463 * It describes a range of clusters on disk.
Mark Fashehe48edee2007-03-07 16:46:57 -0800464 *
465 * Length fields are divided into interior and leaf node versions.
466 * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
Mark Fashehccd979b2005-12-15 14:31:24 -0800467 */
468struct ocfs2_extent_rec {
469/*00*/ __le32 e_cpos; /* Offset into the file, in clusters */
Mark Fashehe48edee2007-03-07 16:46:57 -0800470 union {
471 __le32 e_int_clusters; /* Clusters covered by all children */
472 struct {
473 __le16 e_leaf_clusters; /* Clusters covered by this
474 extent */
475 __u8 e_reserved1;
476 __u8 e_flags; /* Extent flags */
477 };
478 };
Mark Fashehccd979b2005-12-15 14:31:24 -0800479 __le64 e_blkno; /* Physical disk offset, in blocks */
480/*10*/
481};
482
483struct ocfs2_chain_rec {
484 __le32 c_free; /* Number of free bits in this chain. */
485 __le32 c_total; /* Number of total bits in this chain */
486 __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
487};
488
489struct ocfs2_truncate_rec {
490 __le32 t_start; /* 1st cluster in this log */
491 __le32 t_clusters; /* Number of total clusters covered */
492};
493
494/*
495 * On disk extent list for OCFS2 (node in the tree). Note that this
496 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
497 * offsets are relative to ocfs2_dinode.id2.i_list or
498 * ocfs2_extent_block.h_list, respectively.
499 */
500struct ocfs2_extent_list {
501/*00*/ __le16 l_tree_depth; /* Extent tree depth from this
502 point. 0 means data extents
503 hang directly off this
Mark Fashehdcd05382007-01-16 11:32:23 -0800504 header (a leaf)
505 NOTE: The high 8 bits cannot be
506 used - tree_depth is never that big.
507 */
Mark Fashehccd979b2005-12-15 14:31:24 -0800508 __le16 l_count; /* Number of extent records */
509 __le16 l_next_free_rec; /* Next unused extent slot */
510 __le16 l_reserved1;
511 __le64 l_reserved2; /* Pad to
512 sizeof(ocfs2_extent_rec) */
513/*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */
514};
515
516/*
517 * On disk allocation chain list for OCFS2. Note that this is
518 * contained inside ocfs2_dinode, so the offsets are relative to
519 * ocfs2_dinode.id2.i_chain.
520 */
521struct ocfs2_chain_list {
522/*00*/ __le16 cl_cpg; /* Clusters per Block Group */
523 __le16 cl_bpc; /* Bits per cluster */
524 __le16 cl_count; /* Total chains in this list */
525 __le16 cl_next_free_rec; /* Next unused chain slot */
526 __le64 cl_reserved1;
527/*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */
528};
529
530/*
531 * On disk deallocation log for OCFS2. Note that this is
532 * contained inside ocfs2_dinode, so the offsets are relative to
533 * ocfs2_dinode.id2.i_dealloc.
534 */
535struct ocfs2_truncate_log {
536/*00*/ __le16 tl_count; /* Total records in this log */
537 __le16 tl_used; /* Number of records in use */
538 __le32 tl_reserved1;
539/*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */
540};
541
542/*
543 * On disk extent block (indirect block) for OCFS2
544 */
545struct ocfs2_extent_block
546{
547/*00*/ __u8 h_signature[8]; /* Signature for verification */
Joel Beckerab552d52008-10-16 17:50:30 -0700548 struct ocfs2_block_check h_check; /* Error checking */
Mark Fashehccd979b2005-12-15 14:31:24 -0800549/*10*/ __le16 h_suballoc_slot; /* Slot suballocator this
550 extent_header belongs to */
551 __le16 h_suballoc_bit; /* Bit offset in suballocator
552 block group */
553 __le32 h_fs_generation; /* Must match super block */
554 __le64 h_blkno; /* Offset on disk, in blocks */
Joel Becker9cbc0122010-03-26 10:07:42 +0800555/*20*/ __le64 h_suballoc_loc; /* Suballocator block group this
556 eb belongs to. Only valid
557 if allocated from a
558 discontiguous block group */
Mark Fashehccd979b2005-12-15 14:31:24 -0800559 __le64 h_next_leaf_blk; /* Offset on disk, in blocks,
560 of next leaf header pointing
561 to data */
562/*30*/ struct ocfs2_extent_list h_list; /* Extent record list */
563/* Actual on-disk size is one block */
564};
565
566/*
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800567 * On disk slot map for OCFS2. This defines the contents of the "slot_map"
Joel Becker386a2ef2008-02-01 12:06:54 -0800568 * system file. A slot is valid if it contains a node number >= 0. The
569 * value -1 (0xFFFF) is OCFS2_INVALID_SLOT. This marks a slot empty.
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800570 */
571struct ocfs2_slot_map {
572/*00*/ __le16 sm_slots[0];
573/*
574 * Actual on-disk size is one block. OCFS2_MAX_SLOTS is 255,
575 * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.
576 */
577};
578
Joel Becker386a2ef2008-02-01 12:06:54 -0800579struct ocfs2_extended_slot {
580/*00*/ __u8 es_valid;
581 __u8 es_reserved1[3];
582 __le32 es_node_num;
583/*10*/
584};
585
586/*
587 * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
588 * is set. It separates out the valid marker from the node number, and
589 * has room to grow. Unlike the old slot map, this format is defined by
590 * i_size.
591 */
592struct ocfs2_slot_map_extended {
593/*00*/ struct ocfs2_extended_slot se_slots[0];
594/*
595 * Actual size is i_size of the slot_map system file. It should
596 * match s_max_slots * sizeof(struct ocfs2_extended_slot)
597 */
598};
599
Sunil Mushran98f486f22010-10-09 10:24:46 -0700600/*
601 * ci_stackflags is only valid if the incompat bit
602 * OCFS2_FEATURE_INCOMPAT_CLUSTERINFO is set.
603 */
Joel Beckerb61817e2008-02-01 15:08:23 -0800604struct ocfs2_cluster_info {
605/*00*/ __u8 ci_stack[OCFS2_STACK_LABEL_LEN];
Sunil Mushran98f486f22010-10-09 10:24:46 -0700606 union {
607 __le32 ci_reserved;
608 struct {
609 __u8 ci_stackflags;
610 __u8 ci_reserved1;
611 __u8 ci_reserved2;
612 __u8 ci_reserved3;
613 };
614 };
Joel Beckerb61817e2008-02-01 15:08:23 -0800615/*08*/ __u8 ci_cluster[OCFS2_CLUSTER_NAME_LEN];
616/*18*/
617};
618
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800619/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800620 * On disk superblock for OCFS2
621 * Note that it is contained inside an ocfs2_dinode, so all offsets
622 * are relative to the start of ocfs2_dinode.id2.
623 */
624struct ocfs2_super_block {
625/*00*/ __le16 s_major_rev_level;
626 __le16 s_minor_rev_level;
627 __le16 s_mnt_count;
628 __le16 s_max_mnt_count;
629 __le16 s_state; /* File system state */
630 __le16 s_errors; /* Behaviour when detecting errors */
631 __le32 s_checkinterval; /* Max time between checks */
632/*10*/ __le64 s_lastcheck; /* Time of last check */
633 __le32 s_creator_os; /* OS */
634 __le32 s_feature_compat; /* Compatible feature set */
635/*20*/ __le32 s_feature_incompat; /* Incompatible feature set */
636 __le32 s_feature_ro_compat; /* Readonly-compatible feature set */
637 __le64 s_root_blkno; /* Offset, in blocks, of root directory
638 dinode */
639/*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system
640 directory dinode */
641 __le32 s_blocksize_bits; /* Blocksize for this fs */
642 __le32 s_clustersize_bits; /* Clustersize for this fs */
643/*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts
644 before tunefs required */
Mark Fasheh92e91ce2007-09-20 11:19:20 -0700645 __le16 s_tunefs_flag;
Tiger Yangcf1d6c72008-08-18 17:11:00 +0800646 __le32 s_uuid_hash; /* hash value of uuid */
Mark Fashehccd979b2005-12-15 14:31:24 -0800647 __le64 s_first_cluster_group; /* Block offset of 1st cluster
648 * group header */
649/*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
650/*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */
Sunil Mushran98f486f22010-10-09 10:24:46 -0700651/*A0*/ struct ocfs2_cluster_info s_cluster_info; /* Only valid if either
652 userspace or clusterinfo
653 INCOMPAT flag set. */
Tiger Yang8154da32008-08-18 17:11:46 +0800654/*B8*/ __le16 s_xattr_inline_size; /* extended attribute inline size
655 for this fs*/
656 __le16 s_reserved0;
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800657 __le32 s_dx_seed[3]; /* seed[0-2] for dx dir hash.
658 * s_uuid_hash serves as seed[3]. */
659/*C0*/ __le64 s_reserved2[15]; /* Fill out superblock */
Joel Beckerb61817e2008-02-01 15:08:23 -0800660/*140*/
661
662 /*
663 * NOTE: As stated above, all offsets are relative to
664 * ocfs2_dinode.id2, which is at 0xC0 in the inode.
665 * 0xC0 + 0x140 = 0x200 or 512 bytes. A superblock must fit within
666 * our smallest blocksize, which is 512 bytes. To ensure this,
667 * we reserve the space in s_reserved2. Anything past s_reserved2
668 * will not be available on the smallest blocksize.
669 */
Mark Fashehccd979b2005-12-15 14:31:24 -0800670};
671
672/*
673 * Local allocation bitmap for OCFS2 slots
674 * Note that it exists inside an ocfs2_dinode, so all offsets are
675 * relative to the start of ocfs2_dinode.id2.
676 */
677struct ocfs2_local_alloc
678{
679/*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */
680 __le16 la_size; /* Size of included bitmap, in bytes */
681 __le16 la_reserved1;
682 __le64 la_reserved2;
683/*10*/ __u8 la_bitmap[0];
684};
685
686/*
Mark Fasheh15b1e362007-09-07 13:58:15 -0700687 * Data-in-inode header. This is only used if i_dyn_features has
688 * OCFS2_INLINE_DATA_FL set.
689 */
690struct ocfs2_inline_data
691{
692/*00*/ __le16 id_count; /* Number of bytes that can be used
693 * for data, starting at id_data */
694 __le16 id_reserved0;
695 __le32 id_reserved1;
696 __u8 id_data[0]; /* Start of user data */
697};
698
699/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800700 * On disk inode for OCFS2
701 */
702struct ocfs2_dinode {
703/*00*/ __u8 i_signature[8]; /* Signature for validation */
704 __le32 i_generation; /* Generation number */
705 __le16 i_suballoc_slot; /* Slot suballocator this inode
706 belongs to */
707 __le16 i_suballoc_bit; /* Bit offset in suballocator
708 block group */
Mark Fasheh198a1ca2008-11-20 17:54:57 -0800709/*10*/ __le16 i_links_count_hi; /* High 16 bits of links count */
Tiger Yangfdd77702008-08-18 17:08:55 +0800710 __le16 i_xattr_inline_size;
Mark Fashehccd979b2005-12-15 14:31:24 -0800711 __le32 i_clusters; /* Cluster count */
712 __le32 i_uid; /* Owner UID */
713 __le32 i_gid; /* Owning GID */
714/*20*/ __le64 i_size; /* Size in bytes */
715 __le16 i_mode; /* File mode */
716 __le16 i_links_count; /* Links count */
717 __le32 i_flags; /* File flags */
718/*30*/ __le64 i_atime; /* Access time */
719 __le64 i_ctime; /* Creation time */
720/*40*/ __le64 i_mtime; /* Modification time */
721 __le64 i_dtime; /* Deletion time */
722/*50*/ __le64 i_blkno; /* Offset on disk, in blocks */
723 __le64 i_last_eb_blk; /* Pointer to last extent
724 block */
725/*60*/ __le32 i_fs_generation; /* Generation per fs-instance */
726 __le32 i_atime_nsec;
727 __le32 i_ctime_nsec;
728 __le32 i_mtime_nsec;
Tiger Yangfdd77702008-08-18 17:08:55 +0800729/*70*/ __le32 i_attr;
Tiger Yang50008632007-03-20 16:01:38 -0700730 __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL
731 was set in i_flags */
Mark Fasheh15b1e362007-09-07 13:58:15 -0700732 __le16 i_dyn_features;
Tiger Yangfdd77702008-08-18 17:08:55 +0800733 __le64 i_xattr_loc;
Joel Beckerab552d52008-10-16 17:50:30 -0700734/*80*/ struct ocfs2_block_check i_check; /* Error checking */
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800735/*88*/ __le64 i_dx_root; /* Pointer to dir index root block */
Tao Ma721f69c2009-08-18 11:17:49 +0800736/*90*/ __le64 i_refcount_loc;
Joel Becker9cbc0122010-03-26 10:07:42 +0800737 __le64 i_suballoc_loc; /* Suballocator block group this
738 inode belongs to. Only valid
739 if allocated from a
740 discontiguous block group */
Joseph Qi06ee5c72015-02-16 15:59:54 -0800741/*A0*/ __le16 i_dio_orphaned_slot; /* only used for append dio write */
742 __le16 i_reserved1[3];
743 __le64 i_reserved2[2];
Mark Fashehccd979b2005-12-15 14:31:24 -0800744/*B8*/ union {
745 __le64 i_pad1; /* Generic way to refer to this
746 64bit union */
747 struct {
748 __le64 i_rdev; /* Device number */
749 } dev1;
750 struct { /* Info for bitmap system
751 inodes */
752 __le32 i_used; /* Bits (ie, clusters) used */
753 __le32 i_total; /* Total bits (clusters)
754 available */
755 } bitmap1;
756 struct { /* Info for journal system
757 inodes */
758 __le32 ij_flags; /* Mounted, version, etc. */
Sunil Mushranc69991a2008-07-14 17:31:09 -0700759 __le32 ij_recovery_generation; /* Incremented when the
760 journal is recovered
761 after an unclean
762 shutdown */
Mark Fashehccd979b2005-12-15 14:31:24 -0800763 } journal1;
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300764 } id1; /* Inode type dependent 1 */
Mark Fashehccd979b2005-12-15 14:31:24 -0800765/*C0*/ union {
766 struct ocfs2_super_block i_super;
767 struct ocfs2_local_alloc i_lab;
768 struct ocfs2_chain_list i_chain;
769 struct ocfs2_extent_list i_list;
770 struct ocfs2_truncate_log i_dealloc;
Mark Fasheh15b1e362007-09-07 13:58:15 -0700771 struct ocfs2_inline_data i_data;
Mark Fashehccd979b2005-12-15 14:31:24 -0800772 __u8 i_symlink[0];
773 } id2;
774/* Actual on-disk size is one block */
775};
776
777/*
778 * On-disk directory entry structure for OCFS2
779 *
780 * Packed as this structure could be accessed unaligned on 64-bit platforms
781 */
782struct ocfs2_dir_entry {
783/*00*/ __le64 inode; /* Inode number */
784 __le16 rec_len; /* Directory entry length */
785 __u8 name_len; /* Name length */
786 __u8 file_type;
787/*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */
788/* Actual on-disk length specified by rec_len */
789} __attribute__ ((packed));
790
791/*
Mark Fasheh87d35a72008-12-10 17:36:25 -0800792 * Per-block record for the unindexed directory btree. This is carefully
793 * crafted so that the rec_len and name_len records of an ocfs2_dir_entry are
794 * mirrored. That way, the directory manipulation code needs a minimal amount
795 * of update.
796 *
797 * NOTE: Keep this structure aligned to a multiple of 4 bytes.
798 */
799struct ocfs2_dir_block_trailer {
800/*00*/ __le64 db_compat_inode; /* Always zero. Was inode */
801
802 __le16 db_compat_rec_len; /* Backwards compatible with
803 * ocfs2_dir_entry. */
804 __u8 db_compat_name_len; /* Always zero. Was name_len */
805 __u8 db_reserved0;
806 __le16 db_reserved1;
807 __le16 db_free_rec_len; /* Size of largest empty hole
808 * in this block. (unused) */
809/*10*/ __u8 db_signature[8]; /* Signature for verification */
810 __le64 db_reserved2;
811 __le64 db_free_next; /* Next block in list (unused) */
812/*20*/ __le64 db_blkno; /* Offset on disk, in blocks */
813 __le64 db_parent_dinode; /* dinode which owns me, in
814 blocks */
Joel Beckerc175a512008-12-10 17:58:22 -0800815/*30*/ struct ocfs2_block_check db_check; /* Error checking */
Mark Fasheh87d35a72008-12-10 17:36:25 -0800816/*40*/
817};
818
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800819 /*
820 * A directory entry in the indexed tree. We don't store the full name here,
821 * but instead provide a pointer to the full dirent in the unindexed tree.
822 *
823 * We also store name_len here so as to reduce the number of leaf blocks we
824 * need to search in case of collisions.
825 */
826struct ocfs2_dx_entry {
827 __le32 dx_major_hash; /* Used to find logical
828 * cluster in index */
829 __le32 dx_minor_hash; /* Lower bits used to find
830 * block in cluster */
831 __le64 dx_dirent_blk; /* Physical block in unindexed
832 * tree holding this dirent. */
833};
834
835struct ocfs2_dx_entry_list {
836 __le32 de_reserved;
837 __le16 de_count; /* Maximum number of entries
838 * possible in de_entries */
839 __le16 de_num_used; /* Current number of
840 * de_entries entries */
841 struct ocfs2_dx_entry de_entries[0]; /* Indexed dir entries
842 * in a packed array of
843 * length de_num_used */
844};
845
Mark Fasheh4ed8a6b2008-11-24 17:02:08 -0800846#define OCFS2_DX_FLAG_INLINE 0x01
847
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800848/*
849 * A directory indexing block. Each indexed directory has one of these,
850 * pointed to by ocfs2_dinode.
851 *
852 * This block stores an indexed btree root, and a set of free space
853 * start-of-list pointers.
854 */
855struct ocfs2_dx_root_block {
856 __u8 dr_signature[8]; /* Signature for verification */
857 struct ocfs2_block_check dr_check; /* Error checking */
858 __le16 dr_suballoc_slot; /* Slot suballocator this
859 * block belongs to. */
860 __le16 dr_suballoc_bit; /* Bit offset in suballocator
861 * block group */
862 __le32 dr_fs_generation; /* Must match super block */
863 __le64 dr_blkno; /* Offset on disk, in blocks */
864 __le64 dr_last_eb_blk; /* Pointer to last
865 * extent block */
866 __le32 dr_clusters; /* Clusters allocated
867 * to the indexed tree. */
Mark Fasheh4ed8a6b2008-11-24 17:02:08 -0800868 __u8 dr_flags; /* OCFS2_DX_FLAG_* flags */
869 __u8 dr_reserved0;
870 __le16 dr_reserved1;
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800871 __le64 dr_dir_blkno; /* Pointer to parent inode */
Mark Fashehe3a93c22009-02-17 15:29:35 -0800872 __le32 dr_num_entries; /* Total number of
873 * names stored in
874 * this directory.*/
875 __le32 dr_reserved2;
Mark Fashehe7c17e42009-01-29 18:17:46 -0800876 __le64 dr_free_blk; /* Pointer to head of free
877 * unindexed block list. */
Joel Becker9cbc0122010-03-26 10:07:42 +0800878 __le64 dr_suballoc_loc; /* Suballocator block group
879 this root belongs to.
880 Only valid if allocated
881 from a discontiguous
882 block group */
883 __le64 dr_reserved3[14];
Mark Fasheh4ed8a6b2008-11-24 17:02:08 -0800884 union {
885 struct ocfs2_extent_list dr_list; /* Keep this aligned to 128
886 * bits for maximum space
887 * efficiency. */
888 struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of
889 * entries. We grow out
890 * to extents if this
891 * gets too big. */
892 };
Mark Fasheh9b7895e2008-11-12 16:27:44 -0800893};
894
895/*
896 * The header of a leaf block in the indexed tree.
897 */
898struct ocfs2_dx_leaf {
899 __u8 dl_signature[8];/* Signature for verification */
900 struct ocfs2_block_check dl_check; /* Error checking */
901 __le64 dl_blkno; /* Offset on disk, in blocks */
902 __le32 dl_fs_generation;/* Must match super block */
903 __le32 dl_reserved0;
904 __le64 dl_reserved1;
905 struct ocfs2_dx_entry_list dl_list;
906};
907
Mark Fasheh87d35a72008-12-10 17:36:25 -0800908/*
Joel Becker4cbe4242010-04-13 14:26:12 +0800909 * Largest bitmap for a block (suballocator) group in bytes. This limit
910 * does not affect cluster groups (global allocator). Cluster group
911 * bitmaps run to the end of the block.
912 */
913#define OCFS2_MAX_BG_BITMAP_SIZE 256
914
915/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800916 * On disk allocator group structure for OCFS2
917 */
918struct ocfs2_group_desc
919{
920/*00*/ __u8 bg_signature[8]; /* Signature for validation */
921 __le16 bg_size; /* Size of included bitmap in
922 bytes. */
923 __le16 bg_bits; /* Bits represented by this
924 group. */
925 __le16 bg_free_bits_count; /* Free bits count */
926 __le16 bg_chain; /* What chain I am in. */
927/*10*/ __le32 bg_generation;
928 __le32 bg_reserved1;
929 __le64 bg_next_group; /* Next group in my list, in
930 blocks */
931/*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in
932 blocks */
933 __le64 bg_blkno; /* Offset on disk, in blocks */
Joel Beckerab552d52008-10-16 17:50:30 -0700934/*30*/ struct ocfs2_block_check bg_check; /* Error checking */
935 __le64 bg_reserved2;
Joel Becker4cbe4242010-04-13 14:26:12 +0800936/*40*/ union {
937 __u8 bg_bitmap[0];
938 struct {
939 /*
940 * Block groups may be discontiguous when
941 * OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG is set.
Masahiro Yamadae1c05062015-07-07 10:14:59 +0900942 * The extents of a discontiguous block group are
Joel Becker4cbe4242010-04-13 14:26:12 +0800943 * stored in bg_list. It is a flat list.
944 * l_tree_depth must always be zero. A
945 * discontiguous group is signified by a non-zero
946 * bg_list->l_next_free_rec. Only block groups
947 * can be discontiguous; Cluster groups cannot.
948 * We've never made a block group with more than
949 * 2048 blocks (256 bytes of bg_bitmap). This
950 * codifies that limit so that we can fit bg_list.
951 * bg_size of a discontiguous block group will
952 * be 256 to match bg_bitmap_filler.
953 */
954 __u8 bg_bitmap_filler[OCFS2_MAX_BG_BITMAP_SIZE];
955/*140*/ struct ocfs2_extent_list bg_list;
956 };
957 };
958/* Actual on-disk size is one block */
Mark Fashehccd979b2005-12-15 14:31:24 -0800959};
960
Tao Ma721f69c2009-08-18 11:17:49 +0800961struct ocfs2_refcount_rec {
962/*00*/ __le64 r_cpos; /* Physical offset, in clusters */
963 __le32 r_clusters; /* Clusters covered by this extent */
964 __le32 r_refcount; /* Reference count of this extent */
965/*10*/
966};
Tao Mae73a8192009-08-11 14:33:14 +0800967#define OCFS2_32BIT_POS_MASK (0xffffffffULL)
Tao Ma721f69c2009-08-18 11:17:49 +0800968
969#define OCFS2_REFCOUNT_LEAF_FL (0x00000001)
970#define OCFS2_REFCOUNT_TREE_FL (0x00000002)
971
972struct ocfs2_refcount_list {
973/*00*/ __le16 rl_count; /* Maximum number of entries possible
974 in rl_records */
975 __le16 rl_used; /* Current number of used records */
976 __le32 rl_reserved2;
977 __le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */
978/*10*/ struct ocfs2_refcount_rec rl_recs[0]; /* Refcount records */
979};
980
981
982struct ocfs2_refcount_block {
983/*00*/ __u8 rf_signature[8]; /* Signature for verification */
984 __le16 rf_suballoc_slot; /* Slot suballocator this block
985 belongs to */
986 __le16 rf_suballoc_bit; /* Bit offset in suballocator
987 block group */
988 __le32 rf_fs_generation; /* Must match superblock */
989/*10*/ __le64 rf_blkno; /* Offset on disk, in blocks */
990 __le64 rf_parent; /* Parent block, only valid if
991 OCFS2_REFCOUNT_LEAF_FL is set in
992 rf_flags */
993/*20*/ struct ocfs2_block_check rf_check; /* Error checking */
994 __le64 rf_last_eb_blk; /* Pointer to last extent block */
995/*30*/ __le32 rf_count; /* Number of inodes sharing this
996 refcount tree */
997 __le32 rf_flags; /* See the flags above */
998 __le32 rf_clusters; /* clusters covered by refcount tree. */
999 __le32 rf_cpos; /* cluster offset in refcount tree.*/
1000/*40*/ __le32 rf_generation; /* generation number. all be the same
1001 * for the same refcount tree. */
1002 __le32 rf_reserved0;
Joel Becker9cbc0122010-03-26 10:07:42 +08001003 __le64 rf_suballoc_loc; /* Suballocator block group this
1004 refcount block belongs to. Only
1005 valid if allocated from a
1006 discontiguous block group */
1007/*50*/ __le64 rf_reserved1[6];
Tao Ma721f69c2009-08-18 11:17:49 +08001008/*80*/ union {
1009 struct ocfs2_refcount_list rf_records; /* List of refcount
1010 records */
1011 struct ocfs2_extent_list rf_list; /* Extent record list,
1012 only valid if
1013 OCFS2_REFCOUNT_TREE_FL
1014 is set in rf_flags */
1015 };
1016/* Actual on-disk size is one block */
1017};
1018
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001019/*
1020 * On disk extended attribute structure for OCFS2.
1021 */
1022
1023/*
1024 * ocfs2_xattr_entry indicates one extend attribute.
1025 *
1026 * Note that it can be stored in inode, one block or one xattr bucket.
1027 */
1028struct ocfs2_xattr_entry {
1029 __le32 xe_name_hash; /* hash value of xattr prefix+suffix. */
Tao Ma8573f792008-10-24 22:24:17 +08001030 __le16 xe_name_offset; /* byte offset from the 1st entry in the
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001031 local xattr storage(inode, xattr block or
1032 xattr bucket). */
Lucas De Marchie9c54992011-04-26 23:28:26 -07001033 __u8 xe_name_len; /* xattr name len, doesn't include prefix. */
Tao Ma8573f792008-10-24 22:24:17 +08001034 __u8 xe_type; /* the low 7 bits indicate the name prefix
1035 * type and the highest bit indicates whether
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001036 * the EA is stored in the local storage. */
1037 __le64 xe_value_size; /* real xattr value length. */
1038};
1039
1040/*
1041 * On disk structure for xattr header.
1042 *
1043 * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in
1044 * the local xattr storage.
1045 */
1046struct ocfs2_xattr_header {
1047 __le16 xh_count; /* contains the count of how
1048 many records are in the
1049 local xattr storage. */
Tao Ma0c044f02008-08-18 17:38:50 +08001050 __le16 xh_free_start; /* current offset for storing
1051 xattr. */
1052 __le16 xh_name_value_len; /* total length of name/value
1053 length in this bucket. */
Tao Ma8573f792008-10-24 22:24:17 +08001054 __le16 xh_num_buckets; /* Number of xattr buckets
1055 in this extent record,
1056 only valid in the first
1057 bucket. */
Joel Beckerab552d52008-10-16 17:50:30 -07001058 struct ocfs2_block_check xh_check; /* Error checking
1059 (Note, this is only
1060 used for xattr
1061 buckets. A block uses
1062 xb_check and sets
1063 this field to zero.) */
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001064 struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
1065};
1066
1067/*
1068 * On disk structure for xattr value root.
1069 *
Tao Ma8573f792008-10-24 22:24:17 +08001070 * When an xattr's value is large enough, it is stored in an external
1071 * b-tree like file data. The xattr value root points to this structure.
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001072 */
1073struct ocfs2_xattr_value_root {
1074/*00*/ __le32 xr_clusters; /* clusters covered by xattr value. */
1075 __le32 xr_reserved0;
1076 __le64 xr_last_eb_blk; /* Pointer to last extent block */
1077/*10*/ struct ocfs2_extent_list xr_list; /* Extent record list */
1078};
1079
1080/*
1081 * On disk structure for xattr tree root.
1082 *
1083 * It is used when there are too many extended attributes for one file. These
1084 * attributes will be organized and stored in an indexed-btree.
1085 */
1086struct ocfs2_xattr_tree_root {
1087/*00*/ __le32 xt_clusters; /* clusters covered by xattr. */
1088 __le32 xt_reserved0;
1089 __le64 xt_last_eb_blk; /* Pointer to last extent block */
1090/*10*/ struct ocfs2_extent_list xt_list; /* Extent record list */
1091};
1092
Tiger Yangcf1d6c72008-08-18 17:11:00 +08001093#define OCFS2_XATTR_INDEXED 0x1
1094#define OCFS2_HASH_SHIFT 5
1095#define OCFS2_XATTR_ROUND 3
1096#define OCFS2_XATTR_SIZE(size) (((size) + OCFS2_XATTR_ROUND) & \
1097 ~(OCFS2_XATTR_ROUND))
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001098
Tao Ma0c044f02008-08-18 17:38:50 +08001099#define OCFS2_XATTR_BUCKET_SIZE 4096
1100#define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET (OCFS2_XATTR_BUCKET_SIZE \
1101 / OCFS2_MIN_BLOCKSIZE)
1102
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001103/*
1104 * On disk structure for xattr block.
1105 */
1106struct ocfs2_xattr_block {
1107/*00*/ __u8 xb_signature[8]; /* Signature for verification */
1108 __le16 xb_suballoc_slot; /* Slot suballocator this
1109 block belongs to. */
1110 __le16 xb_suballoc_bit; /* Bit offset in suballocator
1111 block group */
1112 __le32 xb_fs_generation; /* Must match super block */
1113/*10*/ __le64 xb_blkno; /* Offset on disk, in blocks */
Joel Beckerab552d52008-10-16 17:50:30 -07001114 struct ocfs2_block_check xb_check; /* Error checking */
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001115/*20*/ __le16 xb_flags; /* Indicates whether this block contains
1116 real xattr or a xattr tree. */
1117 __le16 xb_reserved0;
1118 __le32 xb_reserved1;
Joel Becker9cbc0122010-03-26 10:07:42 +08001119 __le64 xb_suballoc_loc; /* Suballocator block group this
1120 xattr block belongs to. Only
1121 valid if allocated from a
1122 discontiguous block group */
Tao Ma5a7bc8e2008-08-18 17:38:46 +08001123/*30*/ union {
1124 struct ocfs2_xattr_header xb_header; /* xattr header if this
1125 block contains xattr */
1126 struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this
1127 block cotains xattr
1128 tree. */
1129 } xb_attrs;
1130};
1131
1132#define OCFS2_XATTR_ENTRY_LOCAL 0x80
1133#define OCFS2_XATTR_TYPE_MASK 0x7F
1134static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe,
1135 int local)
1136{
1137 if (local)
1138 xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL;
1139 else
1140 xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL;
1141}
1142
1143static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe)
1144{
1145 return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL;
1146}
1147
1148static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type)
1149{
1150 xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK;
1151}
1152
1153static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe)
1154{
1155 return xe->xe_type & OCFS2_XATTR_TYPE_MASK;
1156}
1157
Jan Kara9e33d692008-08-25 19:56:50 +02001158/*
1159 * On disk structures for global quota file
1160 */
1161
1162/* Magic numbers and known versions for global quota files */
1163#define OCFS2_GLOBAL_QMAGICS {\
1164 0x0cf52470, /* USRQUOTA */ \
1165 0x0cf52471 /* GRPQUOTA */ \
1166}
1167
1168#define OCFS2_GLOBAL_QVERSIONS {\
1169 0, \
1170 0, \
1171}
1172
1173
1174/* Each block of each quota file has a certain fixed number of bytes reserved
1175 * for OCFS2 internal use at its end. OCFS2 can use it for things like
1176 * checksums, etc. */
1177#define OCFS2_QBLK_RESERVED_SPACE 8
1178
1179/* Generic header of all quota files */
1180struct ocfs2_disk_dqheader {
1181 __le32 dqh_magic; /* Magic number identifying file */
1182 __le32 dqh_version; /* Quota format version */
1183};
1184
1185#define OCFS2_GLOBAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))
1186
1187/* Information header of global quota file (immediately follows the generic
1188 * header) */
1189struct ocfs2_global_disk_dqinfo {
1190/*00*/ __le32 dqi_bgrace; /* Grace time for space softlimit excess */
1191 __le32 dqi_igrace; /* Grace time for inode softlimit excess */
1192 __le32 dqi_syncms; /* Time after which we sync local changes to
1193 * global quota file */
1194 __le32 dqi_blocks; /* Number of blocks in quota file */
1195/*10*/ __le32 dqi_free_blk; /* First free block in quota file */
1196 __le32 dqi_free_entry; /* First block with free dquot entry in quota
1197 * file */
1198};
1199
1200/* Structure with global user / group information. We reserve some space
1201 * for future use. */
1202struct ocfs2_global_disk_dqblk {
1203/*00*/ __le32 dqb_id; /* ID the structure belongs to */
1204 __le32 dqb_use_count; /* Number of nodes having reference to this structure */
1205 __le64 dqb_ihardlimit; /* absolute limit on allocated inodes */
1206/*10*/ __le64 dqb_isoftlimit; /* preferred inode limit */
1207 __le64 dqb_curinodes; /* current # allocated inodes */
1208/*20*/ __le64 dqb_bhardlimit; /* absolute limit on disk space */
1209 __le64 dqb_bsoftlimit; /* preferred limit on disk space */
1210/*30*/ __le64 dqb_curspace; /* current space occupied */
1211 __le64 dqb_btime; /* time limit for excessive disk use */
1212/*40*/ __le64 dqb_itime; /* time limit for excessive inode use */
1213 __le64 dqb_pad1;
1214/*50*/ __le64 dqb_pad2;
1215};
1216
1217/*
1218 * On-disk structures for local quota file
1219 */
1220
1221/* Magic numbers and known versions for local quota files */
1222#define OCFS2_LOCAL_QMAGICS {\
1223 0x0cf524c0, /* USRQUOTA */ \
1224 0x0cf524c1 /* GRPQUOTA */ \
1225}
1226
1227#define OCFS2_LOCAL_QVERSIONS {\
1228 0, \
1229 0, \
1230}
1231
1232/* Quota flags in dqinfo header */
1233#define OLQF_CLEAN 0x0001 /* Quota file is empty (this should be after\
1234 * quota has been cleanly turned off) */
1235
1236#define OCFS2_LOCAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))
1237
1238/* Information header of local quota file (immediately follows the generic
1239 * header) */
1240struct ocfs2_local_disk_dqinfo {
1241 __le32 dqi_flags; /* Flags for quota file */
1242 __le32 dqi_chunks; /* Number of chunks of quota structures
1243 * with a bitmap */
1244 __le32 dqi_blocks; /* Number of blocks allocated for quota file */
1245};
1246
1247/* Header of one chunk of a quota file */
1248struct ocfs2_local_disk_chunk {
1249 __le32 dqc_free; /* Number of free entries in the bitmap */
Coly Li93654542009-12-06 22:38:53 +08001250 __u8 dqc_bitmap[0]; /* Bitmap of entries in the corresponding
Jan Kara9e33d692008-08-25 19:56:50 +02001251 * chunk of quota file */
1252};
1253
1254/* One entry in local quota file */
1255struct ocfs2_local_disk_dqblk {
1256/*00*/ __le64 dqb_id; /* id this quota applies to */
1257 __le64 dqb_spacemod; /* Change in the amount of used space */
1258/*10*/ __le64 dqb_inodemod; /* Change in the amount of used inodes */
1259};
1260
Joel Beckerab552d52008-10-16 17:50:30 -07001261
1262/*
1263 * The quota trailer lives at the end of each quota block.
1264 */
1265
1266struct ocfs2_disk_dqtrailer {
1267/*00*/ struct ocfs2_block_check dq_check; /* Error checking */
1268/*08*/ /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */
1269};
1270
1271static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize,
1272 void *buf)
1273{
1274 char *ptr = buf;
1275 ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE;
1276
1277 return (struct ocfs2_disk_dqtrailer *)ptr;
1278}
1279
Mark Fashehccd979b2005-12-15 14:31:24 -08001280#ifdef __KERNEL__
1281static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
1282{
1283 return sb->s_blocksize -
1284 offsetof(struct ocfs2_dinode, id2.i_symlink);
1285}
1286
Tiger Yangfdd77702008-08-18 17:08:55 +08001287static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb,
1288 struct ocfs2_dinode *di)
1289{
1290 unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
1291
1292 if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
1293 return sb->s_blocksize -
1294 offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
1295 xattrsize;
1296 else
1297 return sb->s_blocksize -
1298 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
1299}
1300
Mark Fashehccd979b2005-12-15 14:31:24 -08001301static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
1302{
1303 int size;
1304
1305 size = sb->s_blocksize -
1306 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1307
1308 return size / sizeof(struct ocfs2_extent_rec);
1309}
1310
Tiger Yangfdd77702008-08-18 17:08:55 +08001311static inline int ocfs2_extent_recs_per_inode_with_xattr(
1312 struct super_block *sb,
1313 struct ocfs2_dinode *di)
1314{
1315 int size;
1316 unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
1317
1318 if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
1319 size = sb->s_blocksize -
1320 offsetof(struct ocfs2_dinode, id2.i_list.l_recs) -
1321 xattrsize;
1322 else
1323 size = sb->s_blocksize -
1324 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1325
1326 return size / sizeof(struct ocfs2_extent_rec);
1327}
1328
Mark Fasheh9b7895e2008-11-12 16:27:44 -08001329static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb)
1330{
1331 int size;
1332
1333 size = sb->s_blocksize -
1334 offsetof(struct ocfs2_dx_root_block, dr_list.l_recs);
1335
1336 return size / sizeof(struct ocfs2_extent_rec);
1337}
1338
Mark Fashehccd979b2005-12-15 14:31:24 -08001339static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
1340{
1341 int size;
1342
1343 size = sb->s_blocksize -
1344 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
1345
1346 return size / sizeof(struct ocfs2_chain_rec);
1347}
1348
1349static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
1350{
1351 int size;
1352
1353 size = sb->s_blocksize -
1354 offsetof(struct ocfs2_extent_block, h_list.l_recs);
1355
1356 return size / sizeof(struct ocfs2_extent_rec);
1357}
1358
Joel Becker798db352010-04-13 14:26:32 +08001359static inline u16 ocfs2_extent_recs_per_gd(struct super_block *sb)
1360{
1361 int size;
1362
1363 size = sb->s_blocksize -
1364 offsetof(struct ocfs2_group_desc, bg_list.l_recs);
1365
1366 return size / sizeof(struct ocfs2_extent_rec);
1367}
1368
Mark Fasheh9b7895e2008-11-12 16:27:44 -08001369static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb)
1370{
1371 int size;
1372
1373 size = sb->s_blocksize -
1374 offsetof(struct ocfs2_dx_leaf, dl_list.de_entries);
1375
1376 return size / sizeof(struct ocfs2_dx_entry);
1377}
1378
Mark Fasheh4ed8a6b2008-11-24 17:02:08 -08001379static inline int ocfs2_dx_entries_per_root(struct super_block *sb)
1380{
1381 int size;
1382
1383 size = sb->s_blocksize -
1384 offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries);
1385
1386 return size / sizeof(struct ocfs2_dx_entry);
1387}
1388
Mark Fashehccd979b2005-12-15 14:31:24 -08001389static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
1390{
1391 u16 size;
1392
1393 size = sb->s_blocksize -
1394 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
1395
1396 return size;
1397}
1398
Joel Becker4cbe4242010-04-13 14:26:12 +08001399static inline int ocfs2_group_bitmap_size(struct super_block *sb,
Tao Ma85718822010-04-13 14:38:06 +08001400 int suballocator,
1401 u32 feature_incompat)
Mark Fashehccd979b2005-12-15 14:31:24 -08001402{
Tao Ma85718822010-04-13 14:38:06 +08001403 int size = sb->s_blocksize -
1404 offsetof(struct ocfs2_group_desc, bg_bitmap);
Mark Fashehccd979b2005-12-15 14:31:24 -08001405
Tao Ma85718822010-04-13 14:38:06 +08001406 /*
1407 * The cluster allocator uses the entire block. Suballocators have
1408 * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older
1409 * code expects bg_size set to the maximum. Thus we must keep
1410 * bg_size as-is unless discontig_bg is enabled.
1411 */
1412 if (suballocator &&
1413 (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG))
Joel Becker4cbe4242010-04-13 14:26:12 +08001414 size = OCFS2_MAX_BG_BITMAP_SIZE;
Mark Fashehccd979b2005-12-15 14:31:24 -08001415
1416 return size;
1417}
1418
1419static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
1420{
1421 int size;
1422
1423 size = sb->s_blocksize -
1424 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
1425
1426 return size / sizeof(struct ocfs2_truncate_rec);
1427}
Mark Fasheh50af94b2007-01-21 14:44:59 -08001428
1429static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
1430{
1431 u64 offset = OCFS2_BACKUP_SB_START;
1432
1433 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
1434 offset <<= (2 * index);
Mark Fasheha8a75a22007-01-26 10:46:59 -08001435 offset >>= sb->s_blocksize_bits;
Mark Fasheh50af94b2007-01-21 14:44:59 -08001436 return offset;
1437 }
1438
1439 return 0;
1440
1441}
Tao Ma0c044f02008-08-18 17:38:50 +08001442
1443static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)
1444{
1445 int size;
1446
1447 size = sb->s_blocksize -
1448 offsetof(struct ocfs2_xattr_block,
1449 xb_attrs.xb_root.xt_list.l_recs);
1450
1451 return size / sizeof(struct ocfs2_extent_rec);
1452}
Tao Ma721f69c2009-08-18 11:17:49 +08001453
1454static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb)
1455{
1456 int size;
1457
1458 size = sb->s_blocksize -
1459 offsetof(struct ocfs2_refcount_block, rf_list.l_recs);
1460
1461 return size / sizeof(struct ocfs2_extent_rec);
1462}
1463
1464static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb)
1465{
1466 int size;
1467
1468 size = sb->s_blocksize -
1469 offsetof(struct ocfs2_refcount_block, rf_records.rl_recs);
1470
1471 return size / sizeof(struct ocfs2_refcount_rec);
1472}
Tao Mae73a8192009-08-11 14:33:14 +08001473
1474static inline u32
1475ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec *rec)
1476{
1477 return le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1478}
Mark Fashehccd979b2005-12-15 14:31:24 -08001479#else
1480static inline int ocfs2_fast_symlink_chars(int blocksize)
1481{
1482 return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
1483}
1484
Tao Ma1097df32010-01-20 11:31:11 +08001485static inline int ocfs2_max_inline_data_with_xattr(int blocksize,
1486 struct ocfs2_dinode *di)
Mark Fasheh15b1e362007-09-07 13:58:15 -07001487{
Tao Ma1097df32010-01-20 11:31:11 +08001488 if (di && (di->i_dyn_features & OCFS2_INLINE_XATTR_FL))
1489 return blocksize -
1490 offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
1491 di->i_xattr_inline_size;
1492 else
1493 return blocksize -
1494 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
Mark Fasheh15b1e362007-09-07 13:58:15 -07001495}
1496
Mark Fashehccd979b2005-12-15 14:31:24 -08001497static inline int ocfs2_extent_recs_per_inode(int blocksize)
1498{
1499 int size;
1500
1501 size = blocksize -
1502 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1503
1504 return size / sizeof(struct ocfs2_extent_rec);
1505}
1506
1507static inline int ocfs2_chain_recs_per_inode(int blocksize)
1508{
1509 int size;
1510
1511 size = blocksize -
1512 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
1513
1514 return size / sizeof(struct ocfs2_chain_rec);
1515}
1516
1517static inline int ocfs2_extent_recs_per_eb(int blocksize)
1518{
1519 int size;
1520
1521 size = blocksize -
1522 offsetof(struct ocfs2_extent_block, h_list.l_recs);
1523
1524 return size / sizeof(struct ocfs2_extent_rec);
1525}
1526
Joel Becker798db352010-04-13 14:26:32 +08001527static inline int ocfs2_extent_recs_per_gd(int blocksize)
1528{
1529 int size;
1530
1531 size = blocksize -
1532 offsetof(struct ocfs2_group_desc, bg_list.l_recs);
1533
1534 return size / sizeof(struct ocfs2_extent_rec);
1535}
1536
Mark Fashehccd979b2005-12-15 14:31:24 -08001537static inline int ocfs2_local_alloc_size(int blocksize)
1538{
1539 int size;
1540
1541 size = blocksize -
1542 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
1543
1544 return size;
1545}
1546
Tao Ma85718822010-04-13 14:38:06 +08001547static inline int ocfs2_group_bitmap_size(int blocksize,
1548 int suballocator,
1549 uint32_t feature_incompat)
Mark Fashehccd979b2005-12-15 14:31:24 -08001550{
Tao Ma85718822010-04-13 14:38:06 +08001551 int size = sb->s_blocksize -
1552 offsetof(struct ocfs2_group_desc, bg_bitmap);
Mark Fashehccd979b2005-12-15 14:31:24 -08001553
Tao Ma85718822010-04-13 14:38:06 +08001554 /*
1555 * The cluster allocator uses the entire block. Suballocators have
1556 * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older
1557 * code expects bg_size set to the maximum. Thus we must keep
1558 * bg_size as-is unless discontig_bg is enabled.
1559 */
1560 if (suballocator &&
1561 (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG))
Joel Becker4cbe4242010-04-13 14:26:12 +08001562 size = OCFS2_MAX_BG_BITMAP_SIZE;
Mark Fashehccd979b2005-12-15 14:31:24 -08001563
1564 return size;
1565}
1566
1567static inline int ocfs2_truncate_recs_per_inode(int blocksize)
1568{
1569 int size;
1570
1571 size = blocksize -
1572 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
1573
1574 return size / sizeof(struct ocfs2_truncate_rec);
1575}
Mark Fasheh50af94b2007-01-21 14:44:59 -08001576
1577static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
1578{
1579 uint64_t offset = OCFS2_BACKUP_SB_START;
1580
1581 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
1582 offset <<= (2 * index);
1583 offset /= blocksize;
1584 return offset;
1585 }
1586
1587 return 0;
1588}
Tao Ma0c044f02008-08-18 17:38:50 +08001589
1590static inline int ocfs2_xattr_recs_per_xb(int blocksize)
1591{
1592 int size;
1593
1594 size = blocksize -
1595 offsetof(struct ocfs2_xattr_block,
1596 xb_attrs.xb_root.xt_list.l_recs);
1597
1598 return size / sizeof(struct ocfs2_extent_rec);
1599}
Mark Fashehccd979b2005-12-15 14:31:24 -08001600#endif /* __KERNEL__ */
1601
1602
1603static inline int ocfs2_system_inode_is_global(int type)
1604{
1605 return ((type >= 0) &&
1606 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
1607}
1608
1609static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
1610 int type, int slot)
1611{
1612 int chars;
1613
1614 /*
1615 * Global system inodes can only have one copy. Everything
1616 * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
1617 * list has a copy per slot.
1618 */
1619 if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
Joel Beckerfe9f3872008-06-12 22:39:18 -07001620 chars = snprintf(buf, len, "%s",
Mark Fashehccd979b2005-12-15 14:31:24 -08001621 ocfs2_system_inodes[type].si_name);
1622 else
1623 chars = snprintf(buf, len,
1624 ocfs2_system_inodes[type].si_name,
1625 slot);
1626
1627 return chars;
1628}
1629
1630static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
1631 umode_t mode)
1632{
1633 de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
1634}
1635
Tao Maaf2bf0d2010-05-17 15:14:17 +08001636static inline int ocfs2_gd_is_discontig(struct ocfs2_group_desc *gd)
1637{
1638 if ((offsetof(struct ocfs2_group_desc, bg_bitmap) +
1639 le16_to_cpu(gd->bg_size)) !=
1640 offsetof(struct ocfs2_group_desc, bg_list))
1641 return 0;
1642 /*
1643 * Only valid to check l_next_free_rec if
1644 * bg_bitmap + bg_size == bg_list.
1645 */
1646 if (!gd->bg_list.l_next_free_rec)
1647 return 0;
1648 return 1;
1649}
Mark Fashehccd979b2005-12-15 14:31:24 -08001650#endif /* _OCFS2_FS_H */
1651