1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * On-disk structures for OCFS2.
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
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.
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.
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.
29 #define OCFS2_MAJOR_REV_LEVEL 0
30 #define OCFS2_MINOR_REV_LEVEL 90
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.
38 * All other structures are found from the superblock information.
40 * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors. eg, for a
41 * blocksize of 2K, it is 4096 bytes into disk.
43 #define OCFS2_SUPER_BLOCK_BLKNO 2
46 * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could
49 #define OCFS2_MIN_CLUSTERSIZE 4096
50 #define OCFS2_MAX_CLUSTERSIZE 1048576
53 * Blocks cannot be bigger than clusters, so the maximum blocksize is the
54 * minimum cluster size.
56 #define OCFS2_MIN_BLOCKSIZE 512
57 #define OCFS2_MAX_BLOCKSIZE OCFS2_MIN_CLUSTERSIZE
59 /* Filesystem magic number */
60 #define OCFS2_SUPER_MAGIC 0x7461636f
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"
68 /* Compatibility flags */
69 #define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \
70 ( OCFS2_SB(sb)->s_feature_compat & (mask) )
71 #define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask) \
72 ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) )
73 #define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask) \
74 ( OCFS2_SB(sb)->s_feature_incompat & (mask) )
75 #define OCFS2_SET_COMPAT_FEATURE(sb,mask) \
76 OCFS2_SB(sb)->s_feature_compat |= (mask)
77 #define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask) \
78 OCFS2_SB(sb)->s_feature_ro_compat |= (mask)
79 #define OCFS2_SET_INCOMPAT_FEATURE(sb,mask) \
80 OCFS2_SB(sb)->s_feature_incompat |= (mask)
81 #define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask) \
82 OCFS2_SB(sb)->s_feature_compat &= ~(mask)
83 #define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
84 OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask)
85 #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
86 OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
88 #define OCFS2_FEATURE_COMPAT_SUPP OCFS2_FEATURE_COMPAT_BACKUP_SB
89 #define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
90 | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
91 | OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
92 #define OCFS2_FEATURE_RO_COMPAT_SUPP OCFS2_FEATURE_RO_COMPAT_UNWRITTEN
95 * Heartbeat-only devices are missing journals and other files. The
96 * filesystem driver can't load them, but the library can. Never put
97 * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
99 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002
102 * tunefs sets this incompat flag before starting the resize and clears it
103 * at the end. This flag protects users from inadvertently mounting the fs
104 * after an aborted run without fsck-ing.
106 #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004
108 /* Used to denote a non-clustered volume */
109 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008
111 /* Support for sparse allocation in b-trees */
112 #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010
115 * Tunefs sets this incompat flag before starting an operation which
116 * would require cleanup on abort. This is done to protect users from
117 * inadvertently mounting the fs after an aborted run without
120 * s_tunefs_flags on the super block describes precisely which
121 * operations were in progress.
123 #define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG 0x0020
125 /* Support for data packed into inode blocks */
126 #define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040
129 * backup superblock flag is used to indicate that this volume
130 * has backup superblocks.
132 #define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001
135 * Unwritten extents support.
137 #define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001
139 /* The byte offset of the first backup block will be 1G.
140 * The following will be 4G, 16G, 64G, 256G and 1T.
142 #define OCFS2_BACKUP_SB_START 1 << 30
144 /* the max backup superblock nums */
145 #define OCFS2_MAX_BACKUP_SUPERBLOCKS 6
148 * Flags on ocfs2_super_block.s_tunefs_flags
150 #define OCFS2_TUNEFS_INPROG_REMOVE_SLOT 0x0001 /* Removing slots */
153 * Flags on ocfs2_dinode.i_flags
155 #define OCFS2_VALID_FL (0x00000001) /* Inode is valid */
156 #define OCFS2_UNUSED2_FL (0x00000002)
157 #define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */
158 #define OCFS2_UNUSED3_FL (0x00000008)
159 /* System inode flags */
160 #define OCFS2_SYSTEM_FL (0x00000010) /* System inode */
161 #define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */
162 #define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */
163 #define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */
164 #define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */
165 #define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */
166 #define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */
167 #define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */
170 * Flags on ocfs2_dinode.i_dyn_features
172 * These can change much more often than i_flags. When adding flags,
173 * keep in mind that i_dyn_features is only 16 bits wide.
175 #define OCFS2_INLINE_DATA_FL (0x0001) /* Data stored in inode block */
176 #define OCFS2_HAS_XATTR_FL (0x0002)
177 #define OCFS2_INLINE_XATTR_FL (0x0004)
178 #define OCFS2_INDEXED_DIR_FL (0x0008)
180 /* Inode attributes, keep in sync with EXT2 */
181 #define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */
182 #define OCFS2_UNRM_FL (0x00000002) /* Undelete */
183 #define OCFS2_COMPR_FL (0x00000004) /* Compress file */
184 #define OCFS2_SYNC_FL (0x00000008) /* Synchronous updates */
185 #define OCFS2_IMMUTABLE_FL (0x00000010) /* Immutable file */
186 #define OCFS2_APPEND_FL (0x00000020) /* writes to file may only append */
187 #define OCFS2_NODUMP_FL (0x00000040) /* do not dump file */
188 #define OCFS2_NOATIME_FL (0x00000080) /* do not update atime */
189 #define OCFS2_DIRSYNC_FL (0x00010000) /* dirsync behaviour (directories only) */
191 #define OCFS2_FL_VISIBLE (0x000100FF) /* User visible flags */
192 #define OCFS2_FL_MODIFIABLE (0x000100FF) /* User modifiable flags */
195 * Extent record flags (e_node.leaf.flags)
197 #define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
203 #define OCFS2_IOC_GETFLAGS _IOR('f', 1, long)
204 #define OCFS2_IOC_SETFLAGS _IOW('f', 2, long)
205 #define OCFS2_IOC32_GETFLAGS _IOR('f', 1, int)
206 #define OCFS2_IOC32_SETFLAGS _IOW('f', 2, int)
209 * Space reservation / allocation / free ioctls and argument structure
210 * are designed to be compatible with XFS.
212 * ALLOCSP* and FREESP* are not and will never be supported, but are
213 * included here for completeness.
215 struct ocfs2_space_resv {
219 __s64 l_len; /* len == 0 means until end of file */
222 __s32 l_pad[4]; /* reserve area */
225 #define OCFS2_IOC_ALLOCSP _IOW ('X', 10, struct ocfs2_space_resv)
226 #define OCFS2_IOC_FREESP _IOW ('X', 11, struct ocfs2_space_resv)
227 #define OCFS2_IOC_RESVSP _IOW ('X', 40, struct ocfs2_space_resv)
228 #define OCFS2_IOC_UNRESVSP _IOW ('X', 41, struct ocfs2_space_resv)
229 #define OCFS2_IOC_ALLOCSP64 _IOW ('X', 36, struct ocfs2_space_resv)
230 #define OCFS2_IOC_FREESP64 _IOW ('X', 37, struct ocfs2_space_resv)
231 #define OCFS2_IOC_RESVSP64 _IOW ('X', 42, struct ocfs2_space_resv)
232 #define OCFS2_IOC_UNRESVSP64 _IOW ('X', 43, struct ocfs2_space_resv)
234 #define OCFS2_IOC_GROUP_EXTEND _IOW('o', 1, int)
237 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
239 #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */
242 * superblock s_state flags
244 #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */
246 /* Limit of space in ocfs2_dir_entry */
247 #define OCFS2_MAX_FILENAME_LEN 255
249 /* Maximum slots on an ocfs2 file system */
250 #define OCFS2_MAX_SLOTS 255
252 /* Slot map indicator for an empty slot */
253 #define OCFS2_INVALID_SLOT -1
255 #define OCFS2_VOL_UUID_LEN 16
256 #define OCFS2_MAX_VOL_LABEL_LEN 64
258 /* Journal limits (in bytes) */
259 #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024)
261 struct ocfs2_system_inode_info {
267 /* System file index */
269 BAD_BLOCK_SYSTEM_INODE = 0,
270 GLOBAL_INODE_ALLOC_SYSTEM_INODE,
271 SLOT_MAP_SYSTEM_INODE,
272 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
273 HEARTBEAT_SYSTEM_INODE,
274 GLOBAL_BITMAP_SYSTEM_INODE,
275 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE
276 ORPHAN_DIR_SYSTEM_INODE,
277 EXTENT_ALLOC_SYSTEM_INODE,
278 INODE_ALLOC_SYSTEM_INODE,
279 JOURNAL_SYSTEM_INODE,
280 LOCAL_ALLOC_SYSTEM_INODE,
281 TRUNCATE_LOG_SYSTEM_INODE,
285 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
286 /* Global system inodes (single copy) */
287 /* The first two are only used from userspace mfks/tunefs */
288 [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 },
289 [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
291 /* These are used by the running filesystem */
292 [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 },
293 [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
294 [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 },
296 /* Slot-specific system inodes (one copy per slot) */
297 [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
298 [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
299 [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
300 [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
301 [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
302 [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 }
305 /* Parameter passed from mount.ocfs2 to module */
306 #define OCFS2_HB_NONE "heartbeat=none"
307 #define OCFS2_HB_LOCAL "heartbeat=local"
310 * OCFS2 directory file types. Only the low 3 bits are used. The
311 * other bits are reserved for now.
313 #define OCFS2_FT_UNKNOWN 0
314 #define OCFS2_FT_REG_FILE 1
315 #define OCFS2_FT_DIR 2
316 #define OCFS2_FT_CHRDEV 3
317 #define OCFS2_FT_BLKDEV 4
318 #define OCFS2_FT_FIFO 5
319 #define OCFS2_FT_SOCK 6
320 #define OCFS2_FT_SYMLINK 7
322 #define OCFS2_FT_MAX 8
325 * OCFS2_DIR_PAD defines the directory entries boundaries
327 * NOTE: It must be a multiple of 4
329 #define OCFS2_DIR_PAD 4
330 #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1)
331 #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name)
332 #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \
336 #define OCFS2_LINK_MAX 32000
339 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
340 [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE,
341 [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR,
342 [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV,
343 [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV,
344 [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO,
345 [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
346 [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK,
353 #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super))
356 * On disk extent record for OCFS2
357 * It describes a range of clusters on disk.
359 * Length fields are divided into interior and leaf node versions.
360 * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
362 struct ocfs2_extent_rec {
363 /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */
365 __le32 e_int_clusters; /* Clusters covered by all children */
367 __le16 e_leaf_clusters; /* Clusters covered by this
370 __u8 e_flags; /* Extent flags */
373 __le64 e_blkno; /* Physical disk offset, in blocks */
377 struct ocfs2_chain_rec {
378 __le32 c_free; /* Number of free bits in this chain. */
379 __le32 c_total; /* Number of total bits in this chain */
380 __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
383 struct ocfs2_truncate_rec {
384 __le32 t_start; /* 1st cluster in this log */
385 __le32 t_clusters; /* Number of total clusters covered */
389 * On disk extent list for OCFS2 (node in the tree). Note that this
390 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
391 * offsets are relative to ocfs2_dinode.id2.i_list or
392 * ocfs2_extent_block.h_list, respectively.
394 struct ocfs2_extent_list {
395 /*00*/ __le16 l_tree_depth; /* Extent tree depth from this
396 point. 0 means data extents
397 hang directly off this
399 NOTE: The high 8 bits cannot be
400 used - tree_depth is never that big.
402 __le16 l_count; /* Number of extent records */
403 __le16 l_next_free_rec; /* Next unused extent slot */
405 __le64 l_reserved2; /* Pad to
406 sizeof(ocfs2_extent_rec) */
407 /*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */
411 * On disk allocation chain list for OCFS2. Note that this is
412 * contained inside ocfs2_dinode, so the offsets are relative to
413 * ocfs2_dinode.id2.i_chain.
415 struct ocfs2_chain_list {
416 /*00*/ __le16 cl_cpg; /* Clusters per Block Group */
417 __le16 cl_bpc; /* Bits per cluster */
418 __le16 cl_count; /* Total chains in this list */
419 __le16 cl_next_free_rec; /* Next unused chain slot */
421 /*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */
425 * On disk deallocation log for OCFS2. Note that this is
426 * contained inside ocfs2_dinode, so the offsets are relative to
427 * ocfs2_dinode.id2.i_dealloc.
429 struct ocfs2_truncate_log {
430 /*00*/ __le16 tl_count; /* Total records in this log */
431 __le16 tl_used; /* Number of records in use */
433 /*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */
437 * On disk extent block (indirect block) for OCFS2
439 struct ocfs2_extent_block
441 /*00*/ __u8 h_signature[8]; /* Signature for verification */
443 /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this
444 extent_header belongs to */
445 __le16 h_suballoc_bit; /* Bit offset in suballocator
447 __le32 h_fs_generation; /* Must match super block */
448 __le64 h_blkno; /* Offset on disk, in blocks */
449 /*20*/ __le64 h_reserved3;
450 __le64 h_next_leaf_blk; /* Offset on disk, in blocks,
451 of next leaf header pointing
453 /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */
454 /* Actual on-disk size is one block */
458 * On disk superblock for OCFS2
459 * Note that it is contained inside an ocfs2_dinode, so all offsets
460 * are relative to the start of ocfs2_dinode.id2.
462 struct ocfs2_super_block {
463 /*00*/ __le16 s_major_rev_level;
464 __le16 s_minor_rev_level;
466 __le16 s_max_mnt_count;
467 __le16 s_state; /* File system state */
468 __le16 s_errors; /* Behaviour when detecting errors */
469 __le32 s_checkinterval; /* Max time between checks */
470 /*10*/ __le64 s_lastcheck; /* Time of last check */
471 __le32 s_creator_os; /* OS */
472 __le32 s_feature_compat; /* Compatible feature set */
473 /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */
474 __le32 s_feature_ro_compat; /* Readonly-compatible feature set */
475 __le64 s_root_blkno; /* Offset, in blocks, of root directory
477 /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system
479 __le32 s_blocksize_bits; /* Blocksize for this fs */
480 __le32 s_clustersize_bits; /* Clustersize for this fs */
481 /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts
482 before tunefs required */
483 __le16 s_tunefs_flag;
485 __le64 s_first_cluster_group; /* Block offset of 1st cluster
487 /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
488 /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */
493 * Local allocation bitmap for OCFS2 slots
494 * Note that it exists inside an ocfs2_dinode, so all offsets are
495 * relative to the start of ocfs2_dinode.id2.
497 struct ocfs2_local_alloc
499 /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */
500 __le16 la_size; /* Size of included bitmap, in bytes */
503 /*10*/ __u8 la_bitmap[0];
507 * Data-in-inode header. This is only used if i_dyn_features has
508 * OCFS2_INLINE_DATA_FL set.
510 struct ocfs2_inline_data
512 /*00*/ __le16 id_count; /* Number of bytes that can be used
513 * for data, starting at id_data */
516 __u8 id_data[0]; /* Start of user data */
520 * On disk inode for OCFS2
522 struct ocfs2_dinode {
523 /*00*/ __u8 i_signature[8]; /* Signature for validation */
524 __le32 i_generation; /* Generation number */
525 __le16 i_suballoc_slot; /* Slot suballocator this inode
527 __le16 i_suballoc_bit; /* Bit offset in suballocator
529 /*10*/ __le32 i_reserved0;
530 __le32 i_clusters; /* Cluster count */
531 __le32 i_uid; /* Owner UID */
532 __le32 i_gid; /* Owning GID */
533 /*20*/ __le64 i_size; /* Size in bytes */
534 __le16 i_mode; /* File mode */
535 __le16 i_links_count; /* Links count */
536 __le32 i_flags; /* File flags */
537 /*30*/ __le64 i_atime; /* Access time */
538 __le64 i_ctime; /* Creation time */
539 /*40*/ __le64 i_mtime; /* Modification time */
540 __le64 i_dtime; /* Deletion time */
541 /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */
542 __le64 i_last_eb_blk; /* Pointer to last extent
544 /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */
549 __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL
550 was set in i_flags */
551 __le16 i_dyn_features;
552 /*70*/ __le64 i_reserved2[8];
554 __le64 i_pad1; /* Generic way to refer to this
557 __le64 i_rdev; /* Device number */
559 struct { /* Info for bitmap system
561 __le32 i_used; /* Bits (ie, clusters) used */
562 __le32 i_total; /* Total bits (clusters)
565 struct { /* Info for journal system
567 __le32 ij_flags; /* Mounted, version, etc. */
570 } id1; /* Inode type dependant 1 */
572 struct ocfs2_super_block i_super;
573 struct ocfs2_local_alloc i_lab;
574 struct ocfs2_chain_list i_chain;
575 struct ocfs2_extent_list i_list;
576 struct ocfs2_truncate_log i_dealloc;
577 struct ocfs2_inline_data i_data;
580 /* Actual on-disk size is one block */
584 * On-disk directory entry structure for OCFS2
586 * Packed as this structure could be accessed unaligned on 64-bit platforms
588 struct ocfs2_dir_entry {
589 /*00*/ __le64 inode; /* Inode number */
590 __le16 rec_len; /* Directory entry length */
591 __u8 name_len; /* Name length */
593 /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */
594 /* Actual on-disk length specified by rec_len */
595 } __attribute__ ((packed));
598 * On disk allocator group structure for OCFS2
600 struct ocfs2_group_desc
602 /*00*/ __u8 bg_signature[8]; /* Signature for validation */
603 __le16 bg_size; /* Size of included bitmap in
605 __le16 bg_bits; /* Bits represented by this
607 __le16 bg_free_bits_count; /* Free bits count */
608 __le16 bg_chain; /* What chain I am in. */
609 /*10*/ __le32 bg_generation;
611 __le64 bg_next_group; /* Next group in my list, in
613 /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in
615 __le64 bg_blkno; /* Offset on disk, in blocks */
616 /*30*/ __le64 bg_reserved2[2];
617 /*40*/ __u8 bg_bitmap[0];
621 static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
623 return sb->s_blocksize -
624 offsetof(struct ocfs2_dinode, id2.i_symlink);
627 static inline int ocfs2_max_inline_data(struct super_block *sb)
629 return sb->s_blocksize -
630 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
633 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
637 size = sb->s_blocksize -
638 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
640 return size / sizeof(struct ocfs2_extent_rec);
643 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
647 size = sb->s_blocksize -
648 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
650 return size / sizeof(struct ocfs2_chain_rec);
653 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
657 size = sb->s_blocksize -
658 offsetof(struct ocfs2_extent_block, h_list.l_recs);
660 return size / sizeof(struct ocfs2_extent_rec);
663 static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
667 size = sb->s_blocksize -
668 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
673 static inline int ocfs2_group_bitmap_size(struct super_block *sb)
677 size = sb->s_blocksize -
678 offsetof(struct ocfs2_group_desc, bg_bitmap);
683 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
687 size = sb->s_blocksize -
688 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
690 return size / sizeof(struct ocfs2_truncate_rec);
693 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
695 u64 offset = OCFS2_BACKUP_SB_START;
697 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
698 offset <<= (2 * index);
699 offset >>= sb->s_blocksize_bits;
707 static inline int ocfs2_fast_symlink_chars(int blocksize)
709 return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
712 static inline int ocfs2_max_inline_data(int blocksize)
714 return blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data);
717 static inline int ocfs2_extent_recs_per_inode(int blocksize)
722 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
724 return size / sizeof(struct ocfs2_extent_rec);
727 static inline int ocfs2_chain_recs_per_inode(int blocksize)
732 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
734 return size / sizeof(struct ocfs2_chain_rec);
737 static inline int ocfs2_extent_recs_per_eb(int blocksize)
742 offsetof(struct ocfs2_extent_block, h_list.l_recs);
744 return size / sizeof(struct ocfs2_extent_rec);
747 static inline int ocfs2_local_alloc_size(int blocksize)
752 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
757 static inline int ocfs2_group_bitmap_size(int blocksize)
762 offsetof(struct ocfs2_group_desc, bg_bitmap);
767 static inline int ocfs2_truncate_recs_per_inode(int blocksize)
772 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
774 return size / sizeof(struct ocfs2_truncate_rec);
777 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
779 uint64_t offset = OCFS2_BACKUP_SB_START;
781 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
782 offset <<= (2 * index);
789 #endif /* __KERNEL__ */
792 static inline int ocfs2_system_inode_is_global(int type)
794 return ((type >= 0) &&
795 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
798 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
804 * Global system inodes can only have one copy. Everything
805 * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
806 * list has a copy per slot.
808 if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
809 chars = snprintf(buf, len,
810 ocfs2_system_inodes[type].si_name);
812 chars = snprintf(buf, len,
813 ocfs2_system_inodes[type].si_name,
819 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
822 de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
825 #endif /* _OCFS2_FS_H */