1 /* -*- 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"
67 #define OCFS2_XATTR_BLOCK_SIGNATURE	"XATTR01"
68 #define OCFS2_DIR_TRAILER_SIGNATURE	"DIRTRL1"
69 #define OCFS2_DX_ROOT_SIGNATURE		"DXDIR01"
70 #define OCFS2_DX_LEAF_SIGNATURE		"DXLEAF1"
71 #define OCFS2_REFCOUNT_BLOCK_SIGNATURE	"REFCNT1"
72 
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 
93 #define OCFS2_FEATURE_COMPAT_SUPP	(OCFS2_FEATURE_COMPAT_BACKUP_SB	\
94 					 | OCFS2_FEATURE_COMPAT_JBD2_SB)
95 #define OCFS2_FEATURE_INCOMPAT_SUPP	(OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
96 					 | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
97 					 | OCFS2_FEATURE_INCOMPAT_INLINE_DATA \
98 					 | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \
99 					 | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
100 					 | OCFS2_FEATURE_INCOMPAT_XATTR \
101 					 | OCFS2_FEATURE_INCOMPAT_META_ECC \
102 					 | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS \
103 					 | OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE \
104 					 | OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG	\
105 					 | OCFS2_FEATURE_INCOMPAT_CLUSTERINFO)
106 #define OCFS2_FEATURE_RO_COMPAT_SUPP	(OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \
107 					 | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \
108 					 | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
109 
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 
117 /*
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
123 
124 /* Used to denote a non-clustered volume */
125 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT	0x0008
126 
127 /* Support for sparse allocation in b-trees */
128 #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC	0x0010
129 
130 /*
131  * 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 
141 /* Support for data packed into inode blocks */
142 #define OCFS2_FEATURE_INCOMPAT_INLINE_DATA	0x0040
143 
144 /*
145  * 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 
155 /* 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 
161 /* Support for indexed directores */
162 #define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS	0x0400
163 
164 /* Metadata checksum and error correction */
165 #define OCFS2_FEATURE_INCOMPAT_META_ECC		0x0800
166 
167 /* Refcount tree support */
168 #define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE	0x1000
169 
170 /* Discontigous block groups */
171 #define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG	0x2000
172 
173 /*
174  * 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 /*
181  * backup superblock flag is used to indicate that this volume
182  * has backup superblocks.
183  */
184 #define OCFS2_FEATURE_COMPAT_BACKUP_SB		0x0001
185 
186 /*
187  * The filesystem will correctly handle journal feature bits.
188  */
189 #define OCFS2_FEATURE_COMPAT_JBD2_SB		0x0002
190 
191 /*
192  * Unwritten extents support.
193  */
194 #define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN	0x0001
195 
196 /*
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 
202 /* 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 /*
211  * Flags on ocfs2_super_block.s_tunefs_flags
212  */
213 #define OCFS2_TUNEFS_INPROG_REMOVE_SLOT		0x0001	/* Removing slots */
214 
215 /*
216  * 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 */
231 #define OCFS2_QUOTA_FL		(0x00001000)	/* Quota file */
232 
233 /*
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)
243 #define OCFS2_HAS_REFCOUNT_FL   (0x0010)
244 
245 /* Inode attributes, keep in sync with EXT2 */
246 #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 */
268 
269 #define OCFS2_FL_VISIBLE		FS_FL_USER_VISIBLE	/* User visible flags */
270 #define OCFS2_FL_MODIFIABLE		FS_FL_USER_MODIFIABLE	/* User modifiable flags */
271 
272 /*
273  * Extent record flags (e_node.leaf.flags)
274  */
275 #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 */
280 
281 /*
282  * 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 
303 /* The cluster stack fields */
304 #define OCFS2_STACK_LABEL_LEN		4
305 #define OCFS2_CLUSTER_NAME_LEN		16
306 
307 /* Classic (historically speaking) cluster stack */
308 #define OCFS2_CLASSIC_CLUSTER_STACK	"o2cb"
309 
310 /* Journal limits (in bytes) */
311 #define OCFS2_MIN_JOURNAL_SIZE		(4 * 1024 * 1024)
312 
313 /*
314  * 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 
319 /*
320  * Cluster info flags (ocfs2_cluster_info.ci_stackflags)
321  */
322 #define OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT	(0x01)
323 
324 struct ocfs2_system_inode_info {
325 	char	*si_name;
326 	int	si_iflags;
327 	int	si_mode;
328 };
329 
330 /* System file index */
331 enum {
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,
338 	USER_QUOTA_SYSTEM_INODE,
339 	GROUP_QUOTA_SYSTEM_INODE,
340 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE
341 #define OCFS2_FIRST_LOCAL_SYSTEM_INODE ORPHAN_DIR_SYSTEM_INODE
342 	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,
348 	LOCAL_USER_QUOTA_SYSTEM_INODE,
349 	LOCAL_GROUP_QUOTA_SYSTEM_INODE,
350 #define OCFS2_LAST_LOCAL_SYSTEM_INODE LOCAL_GROUP_QUOTA_SYSTEM_INODE
351 	NUM_SYSTEM_INODES
352 };
353 #define NUM_GLOBAL_SYSTEM_INODES OCFS2_FIRST_LOCAL_SYSTEM_INODE
354 #define NUM_LOCAL_SYSTEM_INODES	\
355 		(NUM_SYSTEM_INODES - OCFS2_FIRST_LOCAL_SYSTEM_INODE)
356 
357 static 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 },
367 	[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 },
369 
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 },
376 	[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 },
379 };
380 
381 /* Parameter passed from mount.ocfs2 to module */
382 #define OCFS2_HB_NONE			"heartbeat=none"
383 #define OCFS2_HB_LOCAL			"heartbeat=local"
384 #define OCFS2_HB_GLOBAL			"heartbeat=global"
385 
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)
412 #define OCFS2_DIR_MIN_REC_LEN	OCFS2_DIR_REC_LEN(1)
413 
414 #define OCFS2_LINK_MAX		32000
415 #define	OCFS2_DX_LINK_MAX	((1U << 31) - 1U)
416 #define	OCFS2_LINKS_HI_SHIFT	16
417 #define	OCFS2_DX_ENTRIES_MAX	(0xffffffffU)
418 
419 #define S_SHIFT			12
420 static 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 /*
437  * 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  */
441 struct 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 dependent
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 /*
453  * On disk extent record for OCFS2
454  * It describes a range of clusters on disk.
455  *
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.
458  */
459 struct ocfs2_extent_rec {
460 /*00*/	__le32 e_cpos;		/* Offset into the file, in clusters */
461 	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 	};
470 	__le64 e_blkno;		/* Physical disk offset, in blocks */
471 /*10*/
472 };
473 
474 struct 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 
480 struct 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  */
491 struct 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
495 					   header (a leaf)
496 					   NOTE: The high 8 bits cannot be
497 					   used - tree_depth is never that big.
498 					*/
499 	__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  */
512 struct 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  */
526 struct 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  */
536 struct ocfs2_extent_block
537 {
538 /*00*/	__u8 h_signature[8];		/* Signature for verification */
539 	struct ocfs2_block_check h_check;	/* Error checking */
540 /*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 */
546 /*20*/	__le64 h_suballoc_loc;		/* Suballocator block group this
547 					   eb belongs to.  Only valid
548 					   if allocated from a
549 					   discontiguous block group */
550 	__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 /*
558  * On disk slot map for OCFS2.  This defines the contents of the "slot_map"
559  * 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.
561  */
562 struct 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 
570 struct 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  */
583 struct 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 
591 /*
592  * ci_stackflags is only valid if the incompat bit
593  * OCFS2_FEATURE_INCOMPAT_CLUSTERINFO is set.
594  */
595 struct ocfs2_cluster_info {
596 /*00*/	__u8   ci_stack[OCFS2_STACK_LABEL_LEN];
597 	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 	};
606 /*08*/	__u8   ci_cluster[OCFS2_CLUSTER_NAME_LEN];
607 /*18*/
608 };
609 
610 /*
611  * 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  */
615 struct 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 */
636 	__le16 s_tunefs_flag;
637 	__le32 s_uuid_hash;		/* hash value of uuid */
638 	__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 */
642 /*A0*/  struct ocfs2_cluster_info s_cluster_info; /* Only valid if either
643 						     userspace or clusterinfo
644 						     INCOMPAT flag set. */
645 /*B8*/	__le16 s_xattr_inline_size;	/* extended attribute inline size
646 					   for this fs*/
647 	__le16 s_reserved0;
648 	__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 */
651 /*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 	 */
661 };
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  */
668 struct 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 /*
678  * Data-in-inode header. This is only used if i_dyn_features has
679  * OCFS2_INLINE_DATA_FL set.
680  */
681 struct 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 /*
691  * On disk inode for OCFS2
692  */
693 struct 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 */
700 /*10*/	__le16 i_links_count_hi;	/* High 16 bits of links count */
701 	__le16 i_xattr_inline_size;
702 	__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;
720 /*70*/	__le32 i_attr;
721 	__le16 i_orphaned_slot;		/* Only valid when OCFS2_ORPHANED_FL
722 					   was set in i_flags */
723 	__le16 i_dyn_features;
724 	__le64 i_xattr_loc;
725 /*80*/	struct ocfs2_block_check i_check;	/* Error checking */
726 /*88*/	__le64 i_dx_root;		/* Pointer to dir index root block */
727 /*90*/	__le64 i_refcount_loc;
728 	__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];
733 /*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. */
748 			__le32 ij_recovery_generation; /* Incremented when the
749 							  journal is recovered
750 							  after an unclean
751 							  shutdown */
752 		} journal1;
753 	} id1;				/* Inode type dependent 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;
760 		struct ocfs2_inline_data	i_data;
761 		__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  */
771 struct 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 /*
781  * 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  */
788 struct 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 */
804 /*30*/	struct ocfs2_block_check db_check;	/* Error checking */
805 /*40*/
806 };
807 
808  /*
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  */
815 struct 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 
824 struct 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 
835 #define OCFS2_DX_FLAG_INLINE	0x01
836 
837 /*
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  */
844 struct 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. */
857 	__u8		dr_flags;		/* OCFS2_DX_FLAG_* flags */
858 	__u8		dr_reserved0;
859 	__le16		dr_reserved1;
860 	__le64		dr_dir_blkno;		/* Pointer to parent inode */
861 	__le32		dr_num_entries;		/* Total number of
862 						 * names stored in
863 						 * this directory.*/
864 	__le32		dr_reserved2;
865 	__le64		dr_free_blk;		/* Pointer to head of free
866 						 * unindexed block list. */
867 	__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];
873 	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 	};
882 };
883 
884 /*
885  * The header of a leaf block in the indexed tree.
886  */
887 struct 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 
897 /*
898  * 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 /*
905  * On disk allocator group structure for OCFS2
906  */
907 struct 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 */
923 /*30*/	struct ocfs2_block_check bg_check;	/* Error checking */
924 	__le64   bg_reserved2;
925 /*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 */
948 };
949 
950 struct 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 };
956 #define OCFS2_32BIT_POS_MASK		(0xffffffffULL)
957 
958 #define OCFS2_REFCOUNT_LEAF_FL          (0x00000001)
959 #define OCFS2_REFCOUNT_TREE_FL          (0x00000002)
960 
961 struct 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 
971 struct 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;
992 	__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];
997 /*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 
1008 /*
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  */
1017 struct ocfs2_xattr_entry {
1018 	__le32	xe_name_hash;    /* hash value of xattr prefix+suffix. */
1019 	__le16	xe_name_offset;  /* byte offset from the 1st entry in the
1020 				    local xattr storage(inode, xattr block or
1021 				    xattr bucket). */
1022 	__u8	xe_name_len;	 /* xattr name len, doesn't include prefix. */
1023 	__u8	xe_type;         /* the low 7 bits indicate the name prefix
1024 				  * type and the highest bit indicates whether
1025 				  * 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  */
1035 struct ocfs2_xattr_header {
1036 	__le16	xh_count;                       /* contains the count of how
1037 						   many records are in the
1038 						   local xattr storage. */
1039 	__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. */
1043 	__le16	xh_num_buckets;                 /* Number of xattr buckets
1044 						   in this extent record,
1045 						   only valid in the first
1046 						   bucket. */
1047 	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.) */
1053 	struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
1054 };
1055 
1056 /*
1057  * On disk structure for xattr value root.
1058  *
1059  * 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.
1061  */
1062 struct 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  */
1075 struct 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 
1082 #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))
1087 
1088 #define OCFS2_XATTR_BUCKET_SIZE			4096
1089 #define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET 	(OCFS2_XATTR_BUCKET_SIZE \
1090 						 / OCFS2_MIN_BLOCKSIZE)
1091 
1092 /*
1093  * On disk structure for xattr block.
1094  */
1095 struct 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 */
1103 	struct ocfs2_block_check xb_check;	/* Error checking */
1104 /*20*/	__le16	xb_flags;            /* Indicates whether this block contains
1105 					real xattr or a xattr tree. */
1106 	__le16	xb_reserved0;
1107 	__le32  xb_reserved1;
1108 	__le64	xb_suballoc_loc;	/* Suballocator block group this
1109 					   xattr block belongs to. Only
1110 					   valid if allocated from a
1111 					   discontiguous block group */
1112 /*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
ocfs2_xattr_set_local(struct ocfs2_xattr_entry * xe,int local)1123 static 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 
ocfs2_xattr_is_local(struct ocfs2_xattr_entry * xe)1132 static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe)
1133 {
1134 	return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL;
1135 }
1136 
ocfs2_xattr_set_type(struct ocfs2_xattr_entry * xe,int type)1137 static 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 
ocfs2_xattr_get_type(struct ocfs2_xattr_entry * xe)1142 static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe)
1143 {
1144 	return xe->xe_type & OCFS2_XATTR_TYPE_MASK;
1145 }
1146 
1147 /*
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 */
1169 struct 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) */
1178 struct 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. */
1191 struct 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) */
1229 struct 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 */
1237 struct ocfs2_local_disk_chunk {
1238 	__le32 dqc_free;	/* Number of free entries in the bitmap */
1239 	__u8 dqc_bitmap[0];	/* Bitmap of entries in the corresponding
1240 				 * chunk of quota file */
1241 };
1242 
1243 /* One entry in local quota file */
1244 struct 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 
1250 
1251 /*
1252  * The quota trailer lives at the end of each quota block.
1253  */
1254 
1255 struct 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 
ocfs2_block_dqtrailer(int blocksize,void * buf)1260 static 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 
1269 #ifdef __KERNEL__
ocfs2_fast_symlink_chars(struct super_block * sb)1270 static 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 
ocfs2_max_inline_data_with_xattr(struct super_block * sb,struct ocfs2_dinode * di)1276 static 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 
ocfs2_extent_recs_per_inode(struct super_block * sb)1290 static 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 
ocfs2_extent_recs_per_inode_with_xattr(struct super_block * sb,struct ocfs2_dinode * di)1300 static 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 
ocfs2_extent_recs_per_dx_root(struct super_block * sb)1318 static 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 
ocfs2_chain_recs_per_inode(struct super_block * sb)1328 static 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 
ocfs2_extent_recs_per_eb(struct super_block * sb)1338 static 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 
ocfs2_extent_recs_per_gd(struct super_block * sb)1348 static 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 
ocfs2_dx_entries_per_leaf(struct super_block * sb)1358 static 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 
ocfs2_dx_entries_per_root(struct super_block * sb)1368 static 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 
ocfs2_local_alloc_size(struct super_block * sb)1378 static 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 
ocfs2_group_bitmap_size(struct super_block * sb,int suballocator,u32 feature_incompat)1388 static inline int ocfs2_group_bitmap_size(struct super_block *sb,
1389 					  int suballocator,
1390 					  u32 feature_incompat)
1391 {
1392 	int size = sb->s_blocksize -
1393 		offsetof(struct ocfs2_group_desc, bg_bitmap);
1394 
1395 	/*
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))
1403 		size = OCFS2_MAX_BG_BITMAP_SIZE;
1404 
1405 	return size;
1406 }
1407 
ocfs2_truncate_recs_per_inode(struct super_block * sb)1408 static 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 }
1417 
ocfs2_backup_super_blkno(struct super_block * sb,int index)1418 static 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);
1424 		offset >>= sb->s_blocksize_bits;
1425 		return offset;
1426 	}
1427 
1428 	return 0;
1429 
1430 }
1431 
ocfs2_xattr_recs_per_xb(struct super_block * sb)1432 static 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 }
1442 
ocfs2_extent_recs_per_rb(struct super_block * sb)1443 static 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 
ocfs2_refcount_recs_per_rb(struct super_block * sb)1453 static 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 }
1462 
1463 static inline u32
ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec * rec)1464 ocfs2_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 }
1468 #else
ocfs2_fast_symlink_chars(int blocksize)1469 static inline int ocfs2_fast_symlink_chars(int blocksize)
1470 {
1471 	return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
1472 }
1473 
ocfs2_max_inline_data_with_xattr(int blocksize,struct ocfs2_dinode * di)1474 static inline int ocfs2_max_inline_data_with_xattr(int blocksize,
1475 						   struct ocfs2_dinode *di)
1476 {
1477 	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);
1484 }
1485 
ocfs2_extent_recs_per_inode(int blocksize)1486 static 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 
ocfs2_chain_recs_per_inode(int blocksize)1496 static 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 
ocfs2_extent_recs_per_eb(int blocksize)1506 static 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 
ocfs2_extent_recs_per_gd(int blocksize)1516 static 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 
ocfs2_local_alloc_size(int blocksize)1526 static 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 
ocfs2_group_bitmap_size(int blocksize,int suballocator,uint32_t feature_incompat)1536 static inline int ocfs2_group_bitmap_size(int blocksize,
1537 					  int suballocator,
1538 					  uint32_t feature_incompat)
1539 {
1540 	int size = sb->s_blocksize -
1541 		offsetof(struct ocfs2_group_desc, bg_bitmap);
1542 
1543 	/*
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))
1551 		size = OCFS2_MAX_BG_BITMAP_SIZE;
1552 
1553 	return size;
1554 }
1555 
ocfs2_truncate_recs_per_inode(int blocksize)1556 static 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 }
1565 
ocfs2_backup_super_blkno(int blocksize,int index)1566 static 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 }
1578 
ocfs2_xattr_recs_per_xb(int blocksize)1579 static 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 }
1589 #endif  /* __KERNEL__ */
1590 
1591 
ocfs2_system_inode_is_global(int type)1592 static inline int ocfs2_system_inode_is_global(int type)
1593 {
1594 	return ((type >= 0) &&
1595 		(type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
1596 }
1597 
ocfs2_sprintf_system_inode_name(char * buf,int len,int type,int slot)1598 static 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)
1609 		chars = snprintf(buf, len, "%s",
1610 				 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 
ocfs2_set_de_type(struct ocfs2_dir_entry * de,umode_t mode)1619 static 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 
ocfs2_gd_is_discontig(struct ocfs2_group_desc * gd)1625 static 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 }
1639 #endif  /* _OCFS2_FS_H */
1640 
1641