LCOV - code coverage report
Current view: top level - lkbce/include/linux - ext2_fs.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 11 11 100.0 %
Date: 2017-01-25 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  *  linux/include/linux/ext2_fs.h
       3             :  *
       4             :  * Copyright (C) 1992, 1993, 1994, 1995
       5             :  * Remy Card (card@masi.ibp.fr)
       6             :  * Laboratoire MASI - Institut Blaise Pascal
       7             :  * Universite Pierre et Marie Curie (Paris VI)
       8             :  *
       9             :  *  from
      10             :  *
      11             :  *  linux/include/linux/minix_fs.h
      12             :  *
      13             :  *  Copyright (C) 1991, 1992  Linus Torvalds
      14             :  */
      15             : 
      16             : #ifndef _LINUX_EXT2_FS_H
      17             : #define _LINUX_EXT2_FS_H
      18             : 
      19             : #include <linux/types.h>
      20             : #include <linux/magic.h>
      21             : 
      22             : /*
      23             :  * The second extended filesystem constants/structures
      24             :  */
      25             : 
      26             : /*
      27             :  * Define EXT2FS_DEBUG to produce debug messages
      28             :  */
      29             : #undef EXT2FS_DEBUG
      30             : 
      31             : /*
      32             :  * Define EXT2_RESERVATION to reserve data blocks for expanding files
      33             :  */
      34             : #define EXT2_DEFAULT_RESERVE_BLOCKS     8
      35             : /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
      36             : #define EXT2_MAX_RESERVE_BLOCKS         1027
      37             : #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
      38             : /*
      39             :  * The second extended file system version
      40             :  */
      41             : #define EXT2FS_DATE             "95/08/09"
      42             : #define EXT2FS_VERSION          "0.5b"
      43             : 
      44             : /*
      45             :  * Debug code
      46             :  */
      47             : #ifdef EXT2FS_DEBUG
      48             : #       define ext2_debug(f, a...)      { \
      49             :                                         printk ("EXT2-fs DEBUG (%s, %d): %s:", \
      50             :                                                 __FILE__, __LINE__, __func__); \
      51             :                                         printk (f, ## a); \
      52             :                                         }
      53             : #else
      54             : #       define ext2_debug(f, a...)      /**/
      55             : #endif
      56             : 
      57             : /*
      58             :  * Special inode numbers
      59             :  */
      60             : #define EXT2_BAD_INO             1      /* Bad blocks inode */
      61             : #define EXT2_ROOT_INO            2      /* Root inode */
      62             : #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
      63             : #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
      64             : 
      65             : /* First non-reserved inode for old ext2 filesystems */
      66             : #define EXT2_GOOD_OLD_FIRST_INO 11
      67             : 
      68             : #ifdef __KERNEL__
      69             : #include <linux/ext2_fs_sb.h>
      70             : static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
      71             : {
      72      232996 :         return sb->s_fs_info;
      73             : }
      74           1 : #else
      75             : /* Assume that user mode programs are passing in an ext2fs superblock, not
      76             :  * a kernel struct super_block.  This will allow us to call the feature-test
      77             :  * macros from user land. */
      78             : #define EXT2_SB(sb)     (sb)
      79             : #endif
      80             : 
      81             : /*
      82             :  * Maximal count of links to a file
      83             :  */
      84             : #define EXT2_LINK_MAX           32000
      85             : 
      86             : /*
      87             :  * Macro-instructions used to manage several block sizes
      88             :  */
      89             : #define EXT2_MIN_BLOCK_SIZE             1024
      90             : #define EXT2_MAX_BLOCK_SIZE             4096
      91             : #define EXT2_MIN_BLOCK_LOG_SIZE           10
      92             : #ifdef __KERNEL__
      93             : # define EXT2_BLOCK_SIZE(s)             ((s)->s_blocksize)
      94             : #else
      95             : # define EXT2_BLOCK_SIZE(s)             (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
      96             : #endif
      97             : #define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
      98             : #ifdef __KERNEL__
      99             : # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
     100             : #else
     101             : # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
     102             : #endif
     103             : #ifdef __KERNEL__
     104             : #define EXT2_ADDR_PER_BLOCK_BITS(s)     (EXT2_SB(s)->s_addr_per_block_bits)
     105             : #define EXT2_INODE_SIZE(s)              (EXT2_SB(s)->s_inode_size)
     106             : #define EXT2_FIRST_INO(s)               (EXT2_SB(s)->s_first_ino)
     107             : #else
     108             : #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
     109             :                                  EXT2_GOOD_OLD_INODE_SIZE : \
     110             :                                  (s)->s_inode_size)
     111             : #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
     112             :                                  EXT2_GOOD_OLD_FIRST_INO : \
     113             :                                  (s)->s_first_ino)
     114             : #endif
     115             : 
     116             : /*
     117             :  * Macro-instructions used to manage fragments
     118             :  */
     119             : #define EXT2_MIN_FRAG_SIZE              1024
     120             : #define EXT2_MAX_FRAG_SIZE              4096
     121             : #define EXT2_MIN_FRAG_LOG_SIZE            10
     122             : #ifdef __KERNEL__
     123             : # define EXT2_FRAG_SIZE(s)              (EXT2_SB(s)->s_frag_size)
     124             : # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_SB(s)->s_frags_per_block)
     125             : #else
     126             : # define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
     127             : # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
     128             : #endif
     129             : 
     130             : /*
     131             :  * Structure of a blocks group descriptor
     132             :  */
     133             : struct ext2_group_desc
     134             : {
     135             :         __le32  bg_block_bitmap;                /* Blocks bitmap block */
     136             :         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
     137             :         __le32  bg_inode_table;         /* Inodes table block */
     138             :         __le16  bg_free_blocks_count;   /* Free blocks count */
     139             :         __le16  bg_free_inodes_count;   /* Free inodes count */
     140             :         __le16  bg_used_dirs_count;     /* Directories count */
     141             :         __le16  bg_pad;
     142             :         __le32  bg_reserved[3];
     143             : };
     144             : 
     145             : /*
     146             :  * Macro-instructions used to manage group descriptors
     147             :  */
     148             : #ifdef __KERNEL__
     149             : # define EXT2_BLOCKS_PER_GROUP(s)       (EXT2_SB(s)->s_blocks_per_group)
     150             : # define EXT2_DESC_PER_BLOCK(s)         (EXT2_SB(s)->s_desc_per_block)
     151             : # define EXT2_INODES_PER_GROUP(s)       (EXT2_SB(s)->s_inodes_per_group)
     152             : # define EXT2_DESC_PER_BLOCK_BITS(s)    (EXT2_SB(s)->s_desc_per_block_bits)
     153             : #else
     154             : # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
     155             : # define EXT2_DESC_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
     156             : # define EXT2_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
     157             : #endif
     158             : 
     159             : /*
     160             :  * Constants relative to the data blocks
     161             :  */
     162             : #define EXT2_NDIR_BLOCKS                12
     163             : #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
     164             : #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
     165             : #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
     166             : #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
     167             : 
     168             : /*
     169             :  * Inode flags (GETFLAGS/SETFLAGS)
     170             :  */
     171             : #define EXT2_SECRM_FL                   FS_SECRM_FL     /* Secure deletion */
     172             : #define EXT2_UNRM_FL                    FS_UNRM_FL      /* Undelete */
     173             : #define EXT2_COMPR_FL                   FS_COMPR_FL     /* Compress file */
     174             : #define EXT2_SYNC_FL                    FS_SYNC_FL      /* Synchronous updates */
     175             : #define EXT2_IMMUTABLE_FL               FS_IMMUTABLE_FL /* Immutable file */
     176             : #define EXT2_APPEND_FL                  FS_APPEND_FL    /* writes to file may only append */
     177             : #define EXT2_NODUMP_FL                  FS_NODUMP_FL    /* do not dump file */
     178             : #define EXT2_NOATIME_FL                 FS_NOATIME_FL   /* do not update atime */
     179             : /* Reserved for compression usage... */
     180             : #define EXT2_DIRTY_FL                   FS_DIRTY_FL
     181             : #define EXT2_COMPRBLK_FL                FS_COMPRBLK_FL  /* One or more compressed clusters */
     182             : #define EXT2_NOCOMP_FL                  FS_NOCOMP_FL    /* Don't compress */
     183             : #define EXT2_ECOMPR_FL                  FS_ECOMPR_FL    /* Compression error */
     184             : /* End compression flags --- maybe not all used */      
     185             : #define EXT2_BTREE_FL                   FS_BTREE_FL     /* btree format dir */
     186             : #define EXT2_INDEX_FL                   FS_INDEX_FL     /* hash-indexed directory */
     187             : #define EXT2_IMAGIC_FL                  FS_IMAGIC_FL    /* AFS directory */
     188             : #define EXT2_JOURNAL_DATA_FL            FS_JOURNAL_DATA_FL /* Reserved for ext3 */
     189             : #define EXT2_NOTAIL_FL                  FS_NOTAIL_FL    /* file tail should not be merged */
     190             : #define EXT2_DIRSYNC_FL                 FS_DIRSYNC_FL   /* dirsync behaviour (directories only) */
     191             : #define EXT2_TOPDIR_FL                  FS_TOPDIR_FL    /* Top of directory hierarchies*/
     192             : #define EXT2_RESERVED_FL                FS_RESERVED_FL  /* reserved for ext2 lib */
     193             : 
     194             : #define EXT2_FL_USER_VISIBLE            FS_FL_USER_VISIBLE      /* User visible flags */
     195             : #define EXT2_FL_USER_MODIFIABLE         FS_FL_USER_MODIFIABLE   /* User modifiable flags */
     196             : 
     197             : /* Flags that should be inherited by new inodes from their parent. */
     198             : #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
     199             :                            EXT2_SYNC_FL | EXT2_NODUMP_FL |\
     200             :                            EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\
     201             :                            EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
     202             :                            EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
     203             : 
     204             : /* Flags that are appropriate for regular files (all but dir-specific ones). */
     205             : #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
     206             : 
     207             : /* Flags that are appropriate for non-directories/regular files. */
     208             : #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
     209             : 
     210             : /* Mask out flags that are inappropriate for the given type of inode. */
     211             : static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
     212             : {
     213          40 :         if (S_ISDIR(mode))
     214          20 :                 return flags;
     215          40 :         else if (S_ISREG(mode))
     216          20 :                 return flags & EXT2_REG_FLMASK;
     217             :         else
     218          20 :                 return flags & EXT2_OTHER_FLMASK;
     219             : }
     220           9 : 
     221             : /*
     222             :  * ioctl commands
     223             :  */
     224             : #define EXT2_IOC_GETFLAGS               FS_IOC_GETFLAGS
     225             : #define EXT2_IOC_SETFLAGS               FS_IOC_SETFLAGS
     226             : #define EXT2_IOC_GETVERSION             FS_IOC_GETVERSION
     227             : #define EXT2_IOC_SETVERSION             FS_IOC_SETVERSION
     228             : #define EXT2_IOC_GETRSVSZ               _IOR('f', 5, long)
     229             : #define EXT2_IOC_SETRSVSZ               _IOW('f', 6, long)
     230             : 
     231             : /*
     232             :  * ioctl commands in 32 bit emulation
     233             :  */
     234             : #define EXT2_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
     235             : #define EXT2_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
     236             : #define EXT2_IOC32_GETVERSION           FS_IOC32_GETVERSION
     237             : #define EXT2_IOC32_SETVERSION           FS_IOC32_SETVERSION
     238             : 
     239             : /*
     240             :  * Structure of an inode on the disk
     241             :  */
     242             : struct ext2_inode {
     243             :         __le16  i_mode;         /* File mode */
     244             :         __le16  i_uid;          /* Low 16 bits of Owner Uid */
     245             :         __le32  i_size;         /* Size in bytes */
     246             :         __le32  i_atime;        /* Access time */
     247             :         __le32  i_ctime;        /* Creation time */
     248             :         __le32  i_mtime;        /* Modification time */
     249             :         __le32  i_dtime;        /* Deletion Time */
     250             :         __le16  i_gid;          /* Low 16 bits of Group Id */
     251             :         __le16  i_links_count;  /* Links count */
     252             :         __le32  i_blocks;       /* Blocks count */
     253             :         __le32  i_flags;        /* File flags */
     254             :         union {
     255             :                 struct {
     256             :                         __le32  l_i_reserved1;
     257             :                 } linux1;
     258             :                 struct {
     259             :                         __le32  h_i_translator;
     260             :                 } hurd1;
     261             :                 struct {
     262             :                         __le32  m_i_reserved1;
     263             :                 } masix1;
     264             :         } osd1;                         /* OS dependent 1 */
     265             :         __le32  i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
     266             :         __le32  i_generation;   /* File version (for NFS) */
     267             :         __le32  i_file_acl;     /* File ACL */
     268             :         __le32  i_dir_acl;      /* Directory ACL */
     269             :         __le32  i_faddr;        /* Fragment address */
     270             :         union {
     271             :                 struct {
     272             :                         __u8    l_i_frag;       /* Fragment number */
     273             :                         __u8    l_i_fsize;      /* Fragment size */
     274             :                         __u16   i_pad1;
     275             :                         __le16  l_i_uid_high;   /* these 2 fields    */
     276             :                         __le16  l_i_gid_high;   /* were reserved2[0] */
     277             :                         __u32   l_i_reserved2;
     278             :                 } linux2;
     279             :                 struct {
     280             :                         __u8    h_i_frag;       /* Fragment number */
     281             :                         __u8    h_i_fsize;      /* Fragment size */
     282             :                         __le16  h_i_mode_high;
     283             :                         __le16  h_i_uid_high;
     284             :                         __le16  h_i_gid_high;
     285             :                         __le32  h_i_author;
     286             :                 } hurd2;
     287             :                 struct {
     288             :                         __u8    m_i_frag;       /* Fragment number */
     289             :                         __u8    m_i_fsize;      /* Fragment size */
     290             :                         __u16   m_pad1;
     291             :                         __u32   m_i_reserved2[2];
     292             :                 } masix2;
     293             :         } osd2;                         /* OS dependent 2 */
     294             : };
     295           1 : 
     296             : #define i_size_high     i_dir_acl
     297             : 
     298             : #if defined(__KERNEL__) || defined(__linux__)
     299             : #define i_reserved1     osd1.linux1.l_i_reserved1
     300             : #define i_frag          osd2.linux2.l_i_frag
     301             : #define i_fsize         osd2.linux2.l_i_fsize
     302             : #define i_uid_low       i_uid
     303             : #define i_gid_low       i_gid
     304             : #define i_uid_high      osd2.linux2.l_i_uid_high
     305             : #define i_gid_high      osd2.linux2.l_i_gid_high
     306             : #define i_reserved2     osd2.linux2.l_i_reserved2
     307             : #endif
     308             : 
     309             : #ifdef  __hurd__
     310             : #define i_translator    osd1.hurd1.h_i_translator
     311             : #define i_frag          osd2.hurd2.h_i_frag
     312             : #define i_fsize         osd2.hurd2.h_i_fsize
     313             : #define i_uid_high      osd2.hurd2.h_i_uid_high
     314             : #define i_gid_high      osd2.hurd2.h_i_gid_high
     315             : #define i_author        osd2.hurd2.h_i_author
     316             : #endif
     317             : 
     318             : #ifdef  __masix__
     319             : #define i_reserved1     osd1.masix1.m_i_reserved1
     320             : #define i_frag          osd2.masix2.m_i_frag
     321             : #define i_fsize         osd2.masix2.m_i_fsize
     322             : #define i_reserved2     osd2.masix2.m_i_reserved2
     323             : #endif
     324             : 
     325             : /*
     326             :  * File system states
     327             :  */
     328             : #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
     329             : #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
     330             : 
     331             : /*
     332             :  * Mount flags
     333             :  */
     334             : #define EXT2_MOUNT_CHECK                0x000001  /* Do mount-time checks */
     335             : #define EXT2_MOUNT_OLDALLOC             0x000002  /* Don't use the new Orlov allocator */
     336             : #define EXT2_MOUNT_GRPID                0x000004  /* Create files with directory's group */
     337             : #define EXT2_MOUNT_DEBUG                0x000008  /* Some debugging messages */
     338             : #define EXT2_MOUNT_ERRORS_CONT          0x000010  /* Continue on errors */
     339             : #define EXT2_MOUNT_ERRORS_RO            0x000020  /* Remount fs ro on errors */
     340             : #define EXT2_MOUNT_ERRORS_PANIC         0x000040  /* Panic on errors */
     341             : #define EXT2_MOUNT_MINIX_DF             0x000080  /* Mimics the Minix statfs */
     342             : #define EXT2_MOUNT_NOBH                 0x000100  /* No buffer_heads */
     343             : #define EXT2_MOUNT_NO_UID32             0x000200  /* Disable 32-bit UIDs */
     344             : #define EXT2_MOUNT_XATTR_USER           0x004000  /* Extended user attributes */
     345             : #define EXT2_MOUNT_POSIX_ACL            0x008000  /* POSIX Access Control Lists */
     346             : #define EXT2_MOUNT_XIP                  0x010000  /* Execute in place */
     347             : #define EXT2_MOUNT_USRQUOTA             0x020000  /* user quota */
     348             : #define EXT2_MOUNT_GRPQUOTA             0x040000  /* group quota */
     349             : #define EXT2_MOUNT_RESERVATION          0x080000  /* Preallocation */
     350             : 
     351             : 
     352             : #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
     353             : #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
     354             : #define test_opt(sb, opt)               (EXT2_SB(sb)->s_mount_opt & \
     355             :                                          EXT2_MOUNT_##opt)
     356             : /*
     357             :  * Maximal mount counts between two filesystem checks
     358             :  */
     359             : #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
     360             : #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
     361             : 
     362             : /*
     363             :  * Behaviour when detecting errors
     364             :  */
     365             : #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
     366             : #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
     367             : #define EXT2_ERRORS_PANIC               3       /* Panic */
     368             : #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
     369             : 
     370             : /*
     371             :  * Structure of the super block
     372             :  */
     373             : struct ext2_super_block {
     374             :         __le32  s_inodes_count;         /* Inodes count */
     375             :         __le32  s_blocks_count;         /* Blocks count */
     376             :         __le32  s_r_blocks_count;       /* Reserved blocks count */
     377             :         __le32  s_free_blocks_count;    /* Free blocks count */
     378             :         __le32  s_free_inodes_count;    /* Free inodes count */
     379             :         __le32  s_first_data_block;     /* First Data Block */
     380             :         __le32  s_log_block_size;       /* Block size */
     381             :         __le32  s_log_frag_size;        /* Fragment size */
     382             :         __le32  s_blocks_per_group;     /* # Blocks per group */
     383             :         __le32  s_frags_per_group;      /* # Fragments per group */
     384             :         __le32  s_inodes_per_group;     /* # Inodes per group */
     385             :         __le32  s_mtime;                /* Mount time */
     386             :         __le32  s_wtime;                /* Write time */
     387             :         __le16  s_mnt_count;            /* Mount count */
     388             :         __le16  s_max_mnt_count;        /* Maximal mount count */
     389             :         __le16  s_magic;                /* Magic signature */
     390             :         __le16  s_state;                /* File system state */
     391             :         __le16  s_errors;               /* Behaviour when detecting errors */
     392             :         __le16  s_minor_rev_level;      /* minor revision level */
     393             :         __le32  s_lastcheck;            /* time of last check */
     394             :         __le32  s_checkinterval;        /* max. time between checks */
     395             :         __le32  s_creator_os;           /* OS */
     396             :         __le32  s_rev_level;            /* Revision level */
     397             :         __le16  s_def_resuid;           /* Default uid for reserved blocks */
     398             :         __le16  s_def_resgid;           /* Default gid for reserved blocks */
     399             :         /*
     400             :          * These fields are for EXT2_DYNAMIC_REV superblocks only.
     401             :          *
     402             :          * Note: the difference between the compatible feature set and
     403             :          * the incompatible feature set is that if there is a bit set
     404             :          * in the incompatible feature set that the kernel doesn't
     405             :          * know about, it should refuse to mount the filesystem.
     406             :          * 
     407             :          * e2fsck's requirements are more strict; if it doesn't know
     408             :          * about a feature in either the compatible or incompatible
     409             :          * feature set, it must abort and not try to meddle with
     410             :          * things it doesn't understand...
     411             :          */
     412             :         __le32  s_first_ino;            /* First non-reserved inode */
     413             :         __le16   s_inode_size;          /* size of inode structure */
     414             :         __le16  s_block_group_nr;       /* block group # of this superblock */
     415             :         __le32  s_feature_compat;       /* compatible feature set */
     416             :         __le32  s_feature_incompat;     /* incompatible feature set */
     417             :         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
     418             :         __u8    s_uuid[16];             /* 128-bit uuid for volume */
     419             :         char    s_volume_name[16];      /* volume name */
     420             :         char    s_last_mounted[64];     /* directory where last mounted */
     421             :         __le32  s_algorithm_usage_bitmap; /* For compression */
     422             :         /*
     423             :          * Performance hints.  Directory preallocation should only
     424             :          * happen if the EXT2_COMPAT_PREALLOC flag is on.
     425             :          */
     426             :         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
     427             :         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
     428             :         __u16   s_padding1;
     429             :         /*
     430             :          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
     431             :          */
     432             :         __u8    s_journal_uuid[16];     /* uuid of journal superblock */
     433             :         __u32   s_journal_inum;         /* inode number of journal file */
     434             :         __u32   s_journal_dev;          /* device number of journal file */
     435             :         __u32   s_last_orphan;          /* start of list of inodes to delete */
     436             :         __u32   s_hash_seed[4];         /* HTREE hash seed */
     437             :         __u8    s_def_hash_version;     /* Default hash version to use */
     438             :         __u8    s_reserved_char_pad;
     439             :         __u16   s_reserved_word_pad;
     440             :         __le32  s_default_mount_opts;
     441             :         __le32  s_first_meta_bg;        /* First metablock block group */
     442             :         __u32   s_reserved[190];        /* Padding to the end of the block */
     443             : };
     444             : 
     445             : /*
     446             :  * Codes for operating systems
     447             :  */
     448             : #define EXT2_OS_LINUX           0
     449             : #define EXT2_OS_HURD            1
     450             : #define EXT2_OS_MASIX           2
     451             : #define EXT2_OS_FREEBSD         3
     452             : #define EXT2_OS_LITES           4
     453             : 
     454             : /*
     455             :  * Revision levels
     456             :  */
     457             : #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
     458             : #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
     459             : 
     460             : #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
     461             : #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
     462             : 
     463             : #define EXT2_GOOD_OLD_INODE_SIZE 128
     464             : 
     465             : /*
     466             :  * Feature set definitions
     467             :  */
     468             : 
     469             : #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
     470             :         ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
     471             : #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
     472             :         ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
     473             : #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
     474             :         ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
     475             : #define EXT2_SET_COMPAT_FEATURE(sb,mask)                        \
     476             :         EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
     477             : #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask)                     \
     478             :         EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
     479             : #define EXT2_SET_INCOMPAT_FEATURE(sb,mask)                      \
     480             :         EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
     481             : #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask)                      \
     482             :         EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
     483             : #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
     484             :         EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
     485             : #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
     486             :         EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
     487             : 
     488             : #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
     489             : #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
     490             : #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
     491             : #define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
     492             : #define EXT2_FEATURE_COMPAT_RESIZE_INO          0x0010
     493             : #define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
     494             : #define EXT2_FEATURE_COMPAT_ANY                 0xffffffff
     495             : 
     496             : #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
     497             : #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
     498             : #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
     499             : #define EXT2_FEATURE_RO_COMPAT_ANY              0xffffffff
     500             : 
     501             : #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
     502             : #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
     503             : #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004
     504             : #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008
     505             : #define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
     506             : #define EXT2_FEATURE_INCOMPAT_ANY               0xffffffff
     507             : 
     508             : #define EXT2_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
     509             : #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT2_FEATURE_INCOMPAT_FILETYPE| \
     510             :                                          EXT2_FEATURE_INCOMPAT_META_BG)
     511             : #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
     512             :                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
     513             :                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
     514             : #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED      ~EXT2_FEATURE_RO_COMPAT_SUPP
     515             : #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED       ~EXT2_FEATURE_INCOMPAT_SUPP
     516             : 
     517             : /*
     518             :  * Default values for user and/or group using reserved blocks
     519             :  */
     520             : #define EXT2_DEF_RESUID         0
     521             : #define EXT2_DEF_RESGID         0
     522             : 
     523             : /*
     524             :  * Default mount options
     525             :  */
     526             : #define EXT2_DEFM_DEBUG         0x0001
     527             : #define EXT2_DEFM_BSDGROUPS     0x0002
     528             : #define EXT2_DEFM_XATTR_USER    0x0004
     529             : #define EXT2_DEFM_ACL           0x0008
     530             : #define EXT2_DEFM_UID16         0x0010
     531             :     /* Not used by ext2, but reserved for use by ext3 */
     532             : #define EXT3_DEFM_JMODE         0x0060 
     533             : #define EXT3_DEFM_JMODE_DATA    0x0020
     534             : #define EXT3_DEFM_JMODE_ORDERED 0x0040
     535             : #define EXT3_DEFM_JMODE_WBACK   0x0060
     536             : 
     537             : /*
     538             :  * Structure of a directory entry
     539             :  */
     540             : #define EXT2_NAME_LEN 255
     541             : 
     542             : struct ext2_dir_entry {
     543             :         __le32  inode;                  /* Inode number */
     544             :         __le16  rec_len;                /* Directory entry length */
     545             :         __le16  name_len;               /* Name length */
     546             :         char    name[EXT2_NAME_LEN];    /* File name */
     547             : };
     548           1 : 
     549             : /*
     550             :  * The new version of the directory entry.  Since EXT2 structures are
     551             :  * stored in intel byte order, and the name_len field could never be
     552             :  * bigger than 255 chars, it's safe to reclaim the extra byte for the
     553             :  * file_type field.
     554             :  */
     555             : struct ext2_dir_entry_2 {
     556             :         __le32  inode;                  /* Inode number */
     557             :         __le16  rec_len;                /* Directory entry length */
     558             :         __u8    name_len;               /* Name length */
     559             :         __u8    file_type;
     560             :         char    name[EXT2_NAME_LEN];    /* File name */
     561             : };
     562             : 
     563             : /*
     564             :  * Ext2 directory file types.  Only the low 3 bits are used.  The
     565             :  * other bits are reserved for now.
     566             :  */
     567             : enum {
     568             :         EXT2_FT_UNKNOWN         = 0,
     569             :         EXT2_FT_REG_FILE        = 1,
     570             :         EXT2_FT_DIR             = 2,
     571             :         EXT2_FT_CHRDEV          = 3,
     572             :         EXT2_FT_BLKDEV          = 4,
     573             :         EXT2_FT_FIFO            = 5,
     574           1 :         EXT2_FT_SOCK            = 6,
     575             :         EXT2_FT_SYMLINK         = 7,
     576             :         EXT2_FT_MAX
     577             : };
     578             : 
     579             : /*
     580             :  * EXT2_DIR_PAD defines the directory entries boundaries
     581             :  *
     582             :  * NOTE: It must be a multiple of 4
     583             :  */
     584             : #define EXT2_DIR_PAD                    4
     585             : #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
     586             : #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
     587             :                                          ~EXT2_DIR_ROUND)
     588             : #define EXT2_MAX_REC_LEN                ((1<<16)-1)
     589             : 
     590             : #endif  /* _LINUX_EXT2_FS_H */

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