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---

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001: /*
002:  *  linux/include/linux/ext2_fs.h
003:  *
004:  * Copyright (C) 1992, 1993, 1994, 1995
005:  * Remy Card (card@masi.ibp.fr)
006:  * Laboratoire MASI - Institut Blaise Pascal
007:  * Universite Pierre et Marie Curie (Paris VI)
008:  *
009:  *  from
010:  *
011:  *  linux/include/linux/minix_fs.h
012:  *
013:  *  Copyright (C) 1991, 1992  Linus Torvalds
014:  */
015: 
016: #ifndef _LINUX_EXT2_FS_H
017: #define _LINUX_EXT2_FS_H
018: 
019: #include <linux/types.h>
020: #include <linux/magic.h>
021: #include <linux/fs.h>
022: 
023: /*
024:  * The second extended filesystem constants/structures
025:  */
026: 
027: /*
028:  * Define EXT2FS_DEBUG to produce debug messages
029:  */
030: #undef EXT2FS_DEBUG
031: 
032: /*
033:  * Define EXT2_RESERVATION to reserve data blocks for expanding files
034:  */
035: #define EXT2_DEFAULT_RESERVE_BLOCKS     8
036: /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
037: #define EXT2_MAX_RESERVE_BLOCKS         1027
038: #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
039: /*
040:  * The second extended file system version
041:  */
042: #define EXT2FS_DATE             "95/08/09"
043: #define EXT2FS_VERSION          "0.5b"
044: 
045: /*
046:  * Debug code
047:  */
048: #ifdef EXT2FS_DEBUG
049: #       define ext2_debug(f, a...)      { \
050:                                         printk ("EXT2-fs DEBUG (%s, %d): %s:", \
051:                                                 __FILE__, __LINE__, __func__); \
052:                                         printk (f, ## a); \
053:                                         }
054: #else
055: #       define ext2_debug(f, a...)      /**/
056: #endif
057: 
058: /*
059:  * Special inode numbers
060:  */
061: #define EXT2_BAD_INO             1      /* Bad blocks inode */
062: #define EXT2_ROOT_INO            2      /* Root inode */
063: #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
064: #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
065: 
066: /* First non-reserved inode for old ext2 filesystems */
067: #define EXT2_GOOD_OLD_FIRST_INO 11
068: 
069: /* Assume that user mode programs are passing in an ext2fs superblock, not
070:  * a kernel struct super_block.  This will allow us to call the feature-test
071:  * macros from user land. */
072: #define EXT2_SB(sb)     (sb)
073: 
074: /*
075:  * Maximal count of links to a file
076:  */
077: #define EXT2_LINK_MAX           32000
078: 
079: /*
080:  * Macro-instructions used to manage several block sizes
081:  */
082: #define EXT2_MIN_BLOCK_SIZE             1024
083: #define EXT2_MAX_BLOCK_SIZE             4096
084: #define EXT2_MIN_BLOCK_LOG_SIZE           10
085: # define EXT2_BLOCK_SIZE(s)             (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
086: #define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
087: # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
088: #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
089:                                  EXT2_GOOD_OLD_INODE_SIZE : \
090:                                  (s)->s_inode_size)
091: #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
092:                                  EXT2_GOOD_OLD_FIRST_INO : \
093:                                  (s)->s_first_ino)
094: 
095: /*
096:  * Macro-instructions used to manage fragments
097:  */
098: #define EXT2_MIN_FRAG_SIZE              1024
099: #define EXT2_MAX_FRAG_SIZE              4096
100: #define EXT2_MIN_FRAG_LOG_SIZE            10
101: # define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
102: # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
103: 
104: /*
105:  * Structure of a blocks group descriptor
106:  */
107: struct ext2_group_desc
108: {
109:         __le32  bg_block_bitmap;                /* Blocks bitmap block */
110:         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
111:         __le32  bg_inode_table;         /* Inodes table block */
112:         __le16  bg_free_blocks_count;   /* Free blocks count */
113:         __le16  bg_free_inodes_count;   /* Free inodes count */
114:         __le16  bg_used_dirs_count;     /* Directories count */
115:         __le16  bg_pad;
116:         __le32  bg_reserved[3];
117: };
118: 
119: /*
120:  * Macro-instructions used to manage group descriptors
121:  */
122: # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
123: # define EXT2_DESC_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
124: # define EXT2_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
125: 
126: /*
127:  * Constants relative to the data blocks
128:  */
129: #define EXT2_NDIR_BLOCKS                12
130: #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
131: #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
132: #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
133: #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
134: 
135: /*
136:  * Inode flags (GETFLAGS/SETFLAGS)
137:  */
138: #define EXT2_SECRM_FL                   FS_SECRM_FL     /* Secure deletion */
139: #define EXT2_UNRM_FL                    FS_UNRM_FL      /* Undelete */
140: #define EXT2_COMPR_FL                   FS_COMPR_FL     /* Compress file */
141: #define EXT2_SYNC_FL                    FS_SYNC_FL      /* Synchronous updates */
142: #define EXT2_IMMUTABLE_FL               FS_IMMUTABLE_FL /* Immutable file */
143: #define EXT2_APPEND_FL                  FS_APPEND_FL    /* writes to file may only append */
144: #define EXT2_NODUMP_FL                  FS_NODUMP_FL    /* do not dump file */
145: #define EXT2_NOATIME_FL                 FS_NOATIME_FL   /* do not update atime */
146: /* Reserved for compression usage... */
147: #define EXT2_DIRTY_FL                   FS_DIRTY_FL
148: #define EXT2_COMPRBLK_FL                FS_COMPRBLK_FL  /* One or more compressed clusters */
149: #define EXT2_NOCOMP_FL                  FS_NOCOMP_FL    /* Don't compress */
150: #define EXT2_ECOMPR_FL                  FS_ECOMPR_FL    /* Compression error */
151: /* End compression flags --- maybe not all used */      
152: #define EXT2_BTREE_FL                   FS_BTREE_FL     /* btree format dir */
153: #define EXT2_INDEX_FL                   FS_INDEX_FL     /* hash-indexed directory */
154: #define EXT2_IMAGIC_FL                  FS_IMAGIC_FL    /* AFS directory */
155: #define EXT2_JOURNAL_DATA_FL            FS_JOURNAL_DATA_FL /* Reserved for ext3 */
156: #define EXT2_NOTAIL_FL                  FS_NOTAIL_FL    /* file tail should not be merged */
157: #define EXT2_DIRSYNC_FL                 FS_DIRSYNC_FL   /* dirsync behaviour (directories only) */
158: #define EXT2_TOPDIR_FL                  FS_TOPDIR_FL    /* Top of directory hierarchies*/
159: #define EXT2_RESERVED_FL                FS_RESERVED_FL  /* reserved for ext2 lib */
160: 
161: #define EXT2_FL_USER_VISIBLE            FS_FL_USER_VISIBLE      /* User visible flags */
162: #define EXT2_FL_USER_MODIFIABLE         FS_FL_USER_MODIFIABLE   /* User modifiable flags */
163: 
164: /* Flags that should be inherited by new inodes from their parent. */
165: #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
166:                            EXT2_SYNC_FL | EXT2_NODUMP_FL |\
167:                            EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\
168:                            EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
169:                            EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
170: 
171: /* Flags that are appropriate for regular files (all but dir-specific ones). */
172: #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
173: 
174: /* Flags that are appropriate for non-directories/regular files. */
175: #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
176: 
177: /* Mask out flags that are inappropriate for the given type of inode. */
178: static __inline__ __u32 ext2_mask_flags(umode_t mode, __u32 flags)
179: {
180:         if (S_ISDIR(mode))
181:                 return flags;
182:         else if (S_ISREG(mode))
183:                 return flags & EXT2_REG_FLMASK;
184:         else
185:                 return flags & EXT2_OTHER_FLMASK;
186: }
187: 
188: /*
189:  * ioctl commands
190:  */
191: #define EXT2_IOC_GETFLAGS               FS_IOC_GETFLAGS
192: #define EXT2_IOC_SETFLAGS               FS_IOC_SETFLAGS
193: #define EXT2_IOC_GETVERSION             FS_IOC_GETVERSION
194: #define EXT2_IOC_SETVERSION             FS_IOC_SETVERSION
195: #define EXT2_IOC_GETRSVSZ               _IOR('f', 5, long)
196: #define EXT2_IOC_SETRSVSZ               _IOW('f', 6, long)
197: 
198: /*
199:  * ioctl commands in 32 bit emulation
200:  */
201: #define EXT2_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
202: #define EXT2_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
203: #define EXT2_IOC32_GETVERSION           FS_IOC32_GETVERSION
204: #define EXT2_IOC32_SETVERSION           FS_IOC32_SETVERSION
205: 
206: /*
207:  * Structure of an inode on the disk
208:  */
209: struct ext2_inode {
210:         __le16  i_mode;         /* File mode */
211:         __le16  i_uid;          /* Low 16 bits of Owner Uid */
212:         __le32  i_size;         /* Size in bytes */
213:         __le32  i_atime;        /* Access time */
214:         __le32  i_ctime;        /* Creation time */
215:         __le32  i_mtime;        /* Modification time */
216:         __le32  i_dtime;        /* Deletion Time */
217:         __le16  i_gid;          /* Low 16 bits of Group Id */
218:         __le16  i_links_count;  /* Links count */
219:         __le32  i_blocks;       /* Blocks count */
220:         __le32  i_flags;        /* File flags */
221:         union {
222:                 struct {
223:                         __le32  l_i_reserved1;
224:                 } linux1;
225:                 struct {
226:                         __le32  h_i_translator;
227:                 } hurd1;
228:                 struct {
229:                         __le32  m_i_reserved1;
230:                 } masix1;
231:         } osd1;                         /* OS dependent 1 */
232:         __le32  i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
233:         __le32  i_generation;   /* File version (for NFS) */
234:         __le32  i_file_acl;     /* File ACL */
235:         __le32  i_dir_acl;      /* Directory ACL */
236:         __le32  i_faddr;        /* Fragment address */
237:         union {
238:                 struct {
239:                         __u8    l_i_frag;       /* Fragment number */
240:                         __u8    l_i_fsize;      /* Fragment size */
241:                         __u16   i_pad1;
242:                         __le16  l_i_uid_high;   /* these 2 fields    */
243:                         __le16  l_i_gid_high;   /* were reserved2[0] */
244:                         __u32   l_i_reserved2;
245:                 } linux2;
246:                 struct {
247:                         __u8    h_i_frag;       /* Fragment number */
248:                         __u8    h_i_fsize;      /* Fragment size */
249:                         __le16  h_i_mode_high;
250:                         __le16  h_i_uid_high;
251:                         __le16  h_i_gid_high;
252:                         __le32  h_i_author;
253:                 } hurd2;
254:                 struct {
255:                         __u8    m_i_frag;       /* Fragment number */
256:                         __u8    m_i_fsize;      /* Fragment size */
257:                         __u16   m_pad1;
258:                         __u32   m_i_reserved2[2];
259:                 } masix2;
260:         } osd2;                         /* OS dependent 2 */
261: };
262: 
263: #define i_size_high     i_dir_acl
264: 
265: #if defined(__KERNEL__) || defined(__linux__)
266: #define i_reserved1     osd1.linux1.l_i_reserved1
267: #define i_frag          osd2.linux2.l_i_frag
268: #define i_fsize         osd2.linux2.l_i_fsize
269: #define i_uid_low       i_uid
270: #define i_gid_low       i_gid
271: #define i_uid_high      osd2.linux2.l_i_uid_high
272: #define i_gid_high      osd2.linux2.l_i_gid_high
273: #define i_reserved2     osd2.linux2.l_i_reserved2
274: #endif
275: 
276: #ifdef  __hurd__
277: #define i_translator    osd1.hurd1.h_i_translator
278: #define i_frag          osd2.hurd2.h_i_frag
279: #define i_fsize         osd2.hurd2.h_i_fsize
280: #define i_uid_high      osd2.hurd2.h_i_uid_high
281: #define i_gid_high      osd2.hurd2.h_i_gid_high
282: #define i_author        osd2.hurd2.h_i_author
283: #endif
284: 
285: #ifdef  __masix__
286: #define i_reserved1     osd1.masix1.m_i_reserved1
287: #define i_frag          osd2.masix2.m_i_frag
288: #define i_fsize         osd2.masix2.m_i_fsize
289: #define i_reserved2     osd2.masix2.m_i_reserved2
290: #endif
291: 
292: /*
293:  * File system states
294:  */
295: #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
296: #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
297: 
298: /*
299:  * Mount flags
300:  */
301: #define EXT2_MOUNT_CHECK                0x000001  /* Do mount-time checks */
302: #define EXT2_MOUNT_OLDALLOC             0x000002  /* Don't use the new Orlov allocator */
303: #define EXT2_MOUNT_GRPID                0x000004  /* Create files with directory's group */
304: #define EXT2_MOUNT_DEBUG                0x000008  /* Some debugging messages */
305: #define EXT2_MOUNT_ERRORS_CONT          0x000010  /* Continue on errors */
306: #define EXT2_MOUNT_ERRORS_RO            0x000020  /* Remount fs ro on errors */
307: #define EXT2_MOUNT_ERRORS_PANIC         0x000040  /* Panic on errors */
308: #define EXT2_MOUNT_MINIX_DF             0x000080  /* Mimics the Minix statfs */
309: #define EXT2_MOUNT_NOBH                 0x000100  /* No buffer_heads */
310: #define EXT2_MOUNT_NO_UID32             0x000200  /* Disable 32-bit UIDs */
311: #define EXT2_MOUNT_XATTR_USER           0x004000  /* Extended user attributes */
312: #define EXT2_MOUNT_POSIX_ACL            0x008000  /* POSIX Access Control Lists */
313: #define EXT2_MOUNT_XIP                  0x010000  /* Execute in place */
314: #define EXT2_MOUNT_USRQUOTA             0x020000  /* user quota */
315: #define EXT2_MOUNT_GRPQUOTA             0x040000  /* group quota */
316: #define EXT2_MOUNT_RESERVATION          0x080000  /* Preallocation */
317: 
318: 
319: #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
320: #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
321: #define test_opt(sb, opt)               (EXT2_SB(sb)->s_mount_opt & \
322:                                          EXT2_MOUNT_##opt)
323: /*
324:  * Maximal mount counts between two filesystem checks
325:  */
326: #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
327: #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
328: 
329: /*
330:  * Behaviour when detecting errors
331:  */
332: #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
333: #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
334: #define EXT2_ERRORS_PANIC               3       /* Panic */
335: #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
336: 
337: /*
338:  * Structure of the super block
339:  */
340: struct ext2_super_block {
341:         __le32  s_inodes_count;         /* Inodes count */
342:         __le32  s_blocks_count;         /* Blocks count */
343:         __le32  s_r_blocks_count;       /* Reserved blocks count */
344:         __le32  s_free_blocks_count;    /* Free blocks count */
345:         __le32  s_free_inodes_count;    /* Free inodes count */
346:         __le32  s_first_data_block;     /* First Data Block */
347:         __le32  s_log_block_size;       /* Block size */
348:         __le32  s_log_frag_size;        /* Fragment size */
349:         __le32  s_blocks_per_group;     /* # Blocks per group */
350:         __le32  s_frags_per_group;      /* # Fragments per group */
351:         __le32  s_inodes_per_group;     /* # Inodes per group */
352:         __le32  s_mtime;                /* Mount time */
353:         __le32  s_wtime;                /* Write time */
354:         __le16  s_mnt_count;            /* Mount count */
355:         __le16  s_max_mnt_count;        /* Maximal mount count */
356:         __le16  s_magic;                /* Magic signature */
357:         __le16  s_state;                /* File system state */
358:         __le16  s_errors;               /* Behaviour when detecting errors */
359:         __le16  s_minor_rev_level;      /* minor revision level */
360:         __le32  s_lastcheck;            /* time of last check */
361:         __le32  s_checkinterval;        /* max. time between checks */
362:         __le32  s_creator_os;           /* OS */
363:         __le32  s_rev_level;            /* Revision level */
364:         __le16  s_def_resuid;           /* Default uid for reserved blocks */
365:         __le16  s_def_resgid;           /* Default gid for reserved blocks */
366:         /*
367:          * These fields are for EXT2_DYNAMIC_REV superblocks only.
368:          *
369:          * Note: the difference between the compatible feature set and
370:          * the incompatible feature set is that if there is a bit set
371:          * in the incompatible feature set that the kernel doesn't
372:          * know about, it should refuse to mount the filesystem.
373:          * 
374:          * e2fsck's requirements are more strict; if it doesn't know
375:          * about a feature in either the compatible or incompatible
376:          * feature set, it must abort and not try to meddle with
377:          * things it doesn't understand...
378:          */
379:         __le32  s_first_ino;            /* First non-reserved inode */
380:         __le16   s_inode_size;          /* size of inode structure */
381:         __le16  s_block_group_nr;       /* block group # of this superblock */
382:         __le32  s_feature_compat;       /* compatible feature set */
383:         __le32  s_feature_incompat;     /* incompatible feature set */
384:         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
385:         __u8    s_uuid[16];             /* 128-bit uuid for volume */
386:         char    s_volume_name[16];      /* volume name */
387:         char    s_last_mounted[64];     /* directory where last mounted */
388:         __le32  s_algorithm_usage_bitmap; /* For compression */
389:         /*
390:          * Performance hints.  Directory preallocation should only
391:          * happen if the EXT2_COMPAT_PREALLOC flag is on.
392:          */
393:         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
394:         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
395:         __u16   s_padding1;
396:         /*
397:          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
398:          */
399:         __u8    s_journal_uuid[16];     /* uuid of journal superblock */
400:         __u32   s_journal_inum;         /* inode number of journal file */
401:         __u32   s_journal_dev;          /* device number of journal file */
402:         __u32   s_last_orphan;          /* start of list of inodes to delete */
403:         __u32   s_hash_seed[4];         /* HTREE hash seed */
404:         __u8    s_def_hash_version;     /* Default hash version to use */
405:         __u8    s_reserved_char_pad;
406:         __u16   s_reserved_word_pad;
407:         __le32  s_default_mount_opts;
408:         __le32  s_first_meta_bg;        /* First metablock block group */
409:         __u32   s_reserved[190];        /* Padding to the end of the block */
410: };
411: 
412: /*
413:  * Codes for operating systems
414:  */
415: #define EXT2_OS_LINUX           0
416: #define EXT2_OS_HURD            1
417: #define EXT2_OS_MASIX           2
418: #define EXT2_OS_FREEBSD         3
419: #define EXT2_OS_LITES           4
420: 
421: /*
422:  * Revision levels
423:  */
424: #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
425: #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
426: 
427: #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
428: #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
429: 
430: #define EXT2_GOOD_OLD_INODE_SIZE 128
431: 
432: /*
433:  * Feature set definitions
434:  */
435: 
436: #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
437:         ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
438: #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
439:         ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
440: #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
441:         ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
442: #define EXT2_SET_COMPAT_FEATURE(sb,mask)                        \
443:         EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
444: #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask)                     \
445:         EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
446: #define EXT2_SET_INCOMPAT_FEATURE(sb,mask)                      \
447:         EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
448: #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask)                      \
449:         EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
450: #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
451:         EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
452: #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
453:         EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
454: 
455: #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
456: #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
457: #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
458: #define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
459: #define EXT2_FEATURE_COMPAT_RESIZE_INO          0x0010
460: #define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
461: #define EXT2_FEATURE_COMPAT_ANY                 0xffffffff
462: 
463: #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
464: #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
465: #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
466: #define EXT2_FEATURE_RO_COMPAT_ANY              0xffffffff
467: 
468: #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
469: #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
470: #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004
471: #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008
472: #define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
473: #define EXT2_FEATURE_INCOMPAT_ANY               0xffffffff
474: 
475: #define EXT2_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
476: #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT2_FEATURE_INCOMPAT_FILETYPE| \
477:                                          EXT2_FEATURE_INCOMPAT_META_BG)
478: #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
479:                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
480:                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
481: #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED      ~EXT2_FEATURE_RO_COMPAT_SUPP
482: #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED       ~EXT2_FEATURE_INCOMPAT_SUPP
483: 
484: /*
485:  * Default values for user and/or group using reserved blocks
486:  */
487: #define EXT2_DEF_RESUID         0
488: #define EXT2_DEF_RESGID         0
489: 
490: /*
491:  * Default mount options
492:  */
493: #define EXT2_DEFM_DEBUG         0x0001
494: #define EXT2_DEFM_BSDGROUPS     0x0002
495: #define EXT2_DEFM_XATTR_USER    0x0004
496: #define EXT2_DEFM_ACL           0x0008
497: #define EXT2_DEFM_UID16         0x0010
498:     /* Not used by ext2, but reserved for use by ext3 */
499: #define EXT3_DEFM_JMODE         0x0060 
500: #define EXT3_DEFM_JMODE_DATA    0x0020
501: #define EXT3_DEFM_JMODE_ORDERED 0x0040
502: #define EXT3_DEFM_JMODE_WBACK   0x0060
503: 
504: /*
505:  * Structure of a directory entry
506:  */
507: #define EXT2_NAME_LEN 255
508: 
509: struct ext2_dir_entry {
510:         __le32  inode;                  /* Inode number */
511:         __le16  rec_len;                /* Directory entry length */
512:         __le16  name_len;               /* Name length */
513:         char    name[EXT2_NAME_LEN];    /* File name */
514: };
515: 
516: /*
517:  * The new version of the directory entry.  Since EXT2 structures are
518:  * stored in intel byte order, and the name_len field could never be
519:  * bigger than 255 chars, it's safe to reclaim the extra byte for the
520:  * file_type field.
521:  */
522: struct ext2_dir_entry_2 {
523:         __le32  inode;                  /* Inode number */
524:         __le16  rec_len;                /* Directory entry length */
525:         __u8    name_len;               /* Name length */
526:         __u8    file_type;
527:         char    name[EXT2_NAME_LEN];    /* File name */
528: };
529: 
530: /*
531:  * Ext2 directory file types.  Only the low 3 bits are used.  The
532:  * other bits are reserved for now.
533:  */
534: enum {
535:         EXT2_FT_UNKNOWN         = 0,
536:         EXT2_FT_REG_FILE        = 1,
537:         EXT2_FT_DIR             = 2,
538:         EXT2_FT_CHRDEV          = 3,
539:         EXT2_FT_BLKDEV          = 4,
540:         EXT2_FT_FIFO            = 5,
541:         EXT2_FT_SOCK            = 6,
542:         EXT2_FT_SYMLINK         = 7,
543:         EXT2_FT_MAX
544: };
545: 
546: /*
547:  * EXT2_DIR_PAD defines the directory entries boundaries
548:  *
549:  * NOTE: It must be a multiple of 4
550:  */
551: #define EXT2_DIR_PAD                    4
552: #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
553: #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
554:                                          ~EXT2_DIR_ROUND)
555: #define EXT2_MAX_REC_LEN                ((1<<16)-1)
556: 
557: #endif  /* _LINUX_EXT2_FS_H */
558: 

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