xref: /openbmc/linux/fs/ocfs2/ocfs2_fs.h (revision 8fdff1dc)
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
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  
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  
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  
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  
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__
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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
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
1469  static inline int ocfs2_fast_symlink_chars(int blocksize)
1470  {
1471  	return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
1472  }
1473  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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  
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