linux/fs/ext3/ext3.h
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   1/*
   2 * Written by Stephen C. Tweedie <sct@redhat.com>, 1999
   3 *
   4 * Copyright 1998--1999 Red Hat corp --- All Rights Reserved
   5 *
   6 * This file is part of the Linux kernel and is made available under
   7 * the terms of the GNU General Public License, version 2, or at your
   8 * option, any later version, incorporated herein by reference.
   9 *
  10 * Copyright (C) 1992, 1993, 1994, 1995
  11 * Remy Card (card@masi.ibp.fr)
  12 * Laboratoire MASI - Institut Blaise Pascal
  13 * Universite Pierre et Marie Curie (Paris VI)
  14 *
  15 *  from
  16 *
  17 *  linux/include/linux/minix_fs.h
  18 *
  19 *  Copyright (C) 1991, 1992  Linus Torvalds
  20 */
  21
  22#include <linux/fs.h>
  23#include <linux/jbd.h>
  24#include <linux/magic.h>
  25#include <linux/bug.h>
  26#include <linux/blockgroup_lock.h>
  27
  28/*
  29 * The second extended filesystem constants/structures
  30 */
  31
  32/*
  33 * Define EXT3FS_DEBUG to produce debug messages
  34 */
  35#undef EXT3FS_DEBUG
  36
  37/*
  38 * Define EXT3_RESERVATION to reserve data blocks for expanding files
  39 */
  40#define EXT3_DEFAULT_RESERVE_BLOCKS     8
  41/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  42#define EXT3_MAX_RESERVE_BLOCKS         1027
  43#define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
  44
  45/*
  46 * Debug code
  47 */
  48#ifdef EXT3FS_DEBUG
  49#define ext3_debug(f, a...)                                             \
  50        do {                                                            \
  51                printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:",       \
  52                        __FILE__, __LINE__, __func__);          \
  53                printk (KERN_DEBUG f, ## a);                            \
  54        } while (0)
  55#else
  56#define ext3_debug(f, a...)     do {} while (0)
  57#endif
  58
  59/*
  60 * Special inodes numbers
  61 */
  62#define EXT3_BAD_INO             1      /* Bad blocks inode */
  63#define EXT3_ROOT_INO            2      /* Root inode */
  64#define EXT3_BOOT_LOADER_INO     5      /* Boot loader inode */
  65#define EXT3_UNDEL_DIR_INO       6      /* Undelete directory inode */
  66#define EXT3_RESIZE_INO          7      /* Reserved group descriptors inode */
  67#define EXT3_JOURNAL_INO         8      /* Journal inode */
  68
  69/* First non-reserved inode for old ext3 filesystems */
  70#define EXT3_GOOD_OLD_FIRST_INO 11
  71
  72/*
  73 * Maximal count of links to a file
  74 */
  75#define EXT3_LINK_MAX           32000
  76
  77/*
  78 * Macro-instructions used to manage several block sizes
  79 */
  80#define EXT3_MIN_BLOCK_SIZE             1024
  81#define EXT3_MAX_BLOCK_SIZE             65536
  82#define EXT3_MIN_BLOCK_LOG_SIZE         10
  83#define EXT3_BLOCK_SIZE(s)              ((s)->s_blocksize)
  84#define EXT3_ADDR_PER_BLOCK(s)          (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
  85#define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
  86#define EXT3_ADDR_PER_BLOCK_BITS(s)     (EXT3_SB(s)->s_addr_per_block_bits)
  87#define EXT3_INODE_SIZE(s)              (EXT3_SB(s)->s_inode_size)
  88#define EXT3_FIRST_INO(s)               (EXT3_SB(s)->s_first_ino)
  89
  90/*
  91 * Macro-instructions used to manage fragments
  92 */
  93#define EXT3_MIN_FRAG_SIZE              1024
  94#define EXT3_MAX_FRAG_SIZE              4096
  95#define EXT3_MIN_FRAG_LOG_SIZE            10
  96#define EXT3_FRAG_SIZE(s)               (EXT3_SB(s)->s_frag_size)
  97#define EXT3_FRAGS_PER_BLOCK(s)         (EXT3_SB(s)->s_frags_per_block)
  98
  99/*
 100 * Structure of a blocks group descriptor
 101 */
 102struct ext3_group_desc
 103{
 104        __le32  bg_block_bitmap;                /* Blocks bitmap block */
 105        __le32  bg_inode_bitmap;                /* Inodes bitmap block */
 106        __le32  bg_inode_table;         /* Inodes table block */
 107        __le16  bg_free_blocks_count;   /* Free blocks count */
 108        __le16  bg_free_inodes_count;   /* Free inodes count */
 109        __le16  bg_used_dirs_count;     /* Directories count */
 110        __u16   bg_pad;
 111        __le32  bg_reserved[3];
 112};
 113
 114/*
 115 * Macro-instructions used to manage group descriptors
 116 */
 117#define EXT3_BLOCKS_PER_GROUP(s)        (EXT3_SB(s)->s_blocks_per_group)
 118#define EXT3_DESC_PER_BLOCK(s)          (EXT3_SB(s)->s_desc_per_block)
 119#define EXT3_INODES_PER_GROUP(s)        (EXT3_SB(s)->s_inodes_per_group)
 120#define EXT3_DESC_PER_BLOCK_BITS(s)     (EXT3_SB(s)->s_desc_per_block_bits)
 121
 122/*
 123 * Constants relative to the data blocks
 124 */
 125#define EXT3_NDIR_BLOCKS                12
 126#define EXT3_IND_BLOCK                  EXT3_NDIR_BLOCKS
 127#define EXT3_DIND_BLOCK                 (EXT3_IND_BLOCK + 1)
 128#define EXT3_TIND_BLOCK                 (EXT3_DIND_BLOCK + 1)
 129#define EXT3_N_BLOCKS                   (EXT3_TIND_BLOCK + 1)
 130
 131/*
 132 * Inode flags
 133 */
 134#define EXT3_SECRM_FL                   0x00000001 /* Secure deletion */
 135#define EXT3_UNRM_FL                    0x00000002 /* Undelete */
 136#define EXT3_COMPR_FL                   0x00000004 /* Compress file */
 137#define EXT3_SYNC_FL                    0x00000008 /* Synchronous updates */
 138#define EXT3_IMMUTABLE_FL               0x00000010 /* Immutable file */
 139#define EXT3_APPEND_FL                  0x00000020 /* writes to file may only append */
 140#define EXT3_NODUMP_FL                  0x00000040 /* do not dump file */
 141#define EXT3_NOATIME_FL                 0x00000080 /* do not update atime */
 142/* Reserved for compression usage... */
 143#define EXT3_DIRTY_FL                   0x00000100
 144#define EXT3_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 145#define EXT3_NOCOMPR_FL                 0x00000400 /* Don't compress */
 146#define EXT3_ECOMPR_FL                  0x00000800 /* Compression error */
 147/* End compression flags --- maybe not all used */
 148#define EXT3_INDEX_FL                   0x00001000 /* hash-indexed directory */
 149#define EXT3_IMAGIC_FL                  0x00002000 /* AFS directory */
 150#define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 151#define EXT3_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 152#define EXT3_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 153#define EXT3_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 154#define EXT3_RESERVED_FL                0x80000000 /* reserved for ext3 lib */
 155
 156#define EXT3_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
 157#define EXT3_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 158
 159/* Flags that should be inherited by new inodes from their parent. */
 160#define EXT3_FL_INHERITED (EXT3_SECRM_FL | EXT3_UNRM_FL | EXT3_COMPR_FL |\
 161                           EXT3_SYNC_FL | EXT3_NODUMP_FL |\
 162                           EXT3_NOATIME_FL | EXT3_COMPRBLK_FL |\
 163                           EXT3_NOCOMPR_FL | EXT3_JOURNAL_DATA_FL |\
 164                           EXT3_NOTAIL_FL | EXT3_DIRSYNC_FL)
 165
 166/* Flags that are appropriate for regular files (all but dir-specific ones). */
 167#define EXT3_REG_FLMASK (~(EXT3_DIRSYNC_FL | EXT3_TOPDIR_FL))
 168
 169/* Flags that are appropriate for non-directories/regular files. */
 170#define EXT3_OTHER_FLMASK (EXT3_NODUMP_FL | EXT3_NOATIME_FL)
 171
 172/* Mask out flags that are inappropriate for the given type of inode. */
 173static inline __u32 ext3_mask_flags(umode_t mode, __u32 flags)
 174{
 175        if (S_ISDIR(mode))
 176                return flags;
 177        else if (S_ISREG(mode))
 178                return flags & EXT3_REG_FLMASK;
 179        else
 180                return flags & EXT3_OTHER_FLMASK;
 181}
 182
 183/* Used to pass group descriptor data when online resize is done */
 184struct ext3_new_group_input {
 185        __u32 group;            /* Group number for this data */
 186        __u32 block_bitmap;     /* Absolute block number of block bitmap */
 187        __u32 inode_bitmap;     /* Absolute block number of inode bitmap */
 188        __u32 inode_table;      /* Absolute block number of inode table start */
 189        __u32 blocks_count;     /* Total number of blocks in this group */
 190        __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 191        __u16 unused;
 192};
 193
 194/* The struct ext3_new_group_input in kernel space, with free_blocks_count */
 195struct ext3_new_group_data {
 196        __u32 group;
 197        __u32 block_bitmap;
 198        __u32 inode_bitmap;
 199        __u32 inode_table;
 200        __u32 blocks_count;
 201        __u16 reserved_blocks;
 202        __u16 unused;
 203        __u32 free_blocks_count;
 204};
 205
 206
 207/*
 208 * ioctl commands
 209 */
 210#define EXT3_IOC_GETFLAGS               FS_IOC_GETFLAGS
 211#define EXT3_IOC_SETFLAGS               FS_IOC_SETFLAGS
 212#define EXT3_IOC_GETVERSION             _IOR('f', 3, long)
 213#define EXT3_IOC_SETVERSION             _IOW('f', 4, long)
 214#define EXT3_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 215#define EXT3_IOC_GROUP_ADD              _IOW('f', 8,struct ext3_new_group_input)
 216#define EXT3_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 217#define EXT3_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 218#ifdef CONFIG_JBD_DEBUG
 219#define EXT3_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 220#endif
 221#define EXT3_IOC_GETRSVSZ               _IOR('f', 5, long)
 222#define EXT3_IOC_SETRSVSZ               _IOW('f', 6, long)
 223
 224/*
 225 * ioctl commands in 32 bit emulation
 226 */
 227#define EXT3_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 228#define EXT3_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 229#define EXT3_IOC32_GETVERSION           _IOR('f', 3, int)
 230#define EXT3_IOC32_SETVERSION           _IOW('f', 4, int)
 231#define EXT3_IOC32_GETRSVSZ             _IOR('f', 5, int)
 232#define EXT3_IOC32_SETRSVSZ             _IOW('f', 6, int)
 233#define EXT3_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 234#ifdef CONFIG_JBD_DEBUG
 235#define EXT3_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 236#endif
 237#define EXT3_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 238#define EXT3_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 239
 240
 241/*
 242 *  Mount options
 243 */
 244struct ext3_mount_options {
 245        unsigned long s_mount_opt;
 246        kuid_t s_resuid;
 247        kgid_t s_resgid;
 248        unsigned long s_commit_interval;
 249#ifdef CONFIG_QUOTA
 250        int s_jquota_fmt;
 251        char *s_qf_names[MAXQUOTAS];
 252#endif
 253};
 254
 255/*
 256 * Structure of an inode on the disk
 257 */
 258struct ext3_inode {
 259        __le16  i_mode;         /* File mode */
 260        __le16  i_uid;          /* Low 16 bits of Owner Uid */
 261        __le32  i_size;         /* Size in bytes */
 262        __le32  i_atime;        /* Access time */
 263        __le32  i_ctime;        /* Creation time */
 264        __le32  i_mtime;        /* Modification time */
 265        __le32  i_dtime;        /* Deletion Time */
 266        __le16  i_gid;          /* Low 16 bits of Group Id */
 267        __le16  i_links_count;  /* Links count */
 268        __le32  i_blocks;       /* Blocks count */
 269        __le32  i_flags;        /* File flags */
 270        union {
 271                struct {
 272                        __u32  l_i_reserved1;
 273                } linux1;
 274                struct {
 275                        __u32  h_i_translator;
 276                } hurd1;
 277                struct {
 278                        __u32  m_i_reserved1;
 279                } masix1;
 280        } osd1;                         /* OS dependent 1 */
 281        __le32  i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
 282        __le32  i_generation;   /* File version (for NFS) */
 283        __le32  i_file_acl;     /* File ACL */
 284        __le32  i_dir_acl;      /* Directory ACL */
 285        __le32  i_faddr;        /* Fragment address */
 286        union {
 287                struct {
 288                        __u8    l_i_frag;       /* Fragment number */
 289                        __u8    l_i_fsize;      /* Fragment size */
 290                        __u16   i_pad1;
 291                        __le16  l_i_uid_high;   /* these 2 fields    */
 292                        __le16  l_i_gid_high;   /* were reserved2[0] */
 293                        __u32   l_i_reserved2;
 294                } linux2;
 295                struct {
 296                        __u8    h_i_frag;       /* Fragment number */
 297                        __u8    h_i_fsize;      /* Fragment size */
 298                        __u16   h_i_mode_high;
 299                        __u16   h_i_uid_high;
 300                        __u16   h_i_gid_high;
 301                        __u32   h_i_author;
 302                } hurd2;
 303                struct {
 304                        __u8    m_i_frag;       /* Fragment number */
 305                        __u8    m_i_fsize;      /* Fragment size */
 306                        __u16   m_pad1;
 307                        __u32   m_i_reserved2[2];
 308                } masix2;
 309        } osd2;                         /* OS dependent 2 */
 310        __le16  i_extra_isize;
 311        __le16  i_pad1;
 312};
 313
 314#define i_size_high     i_dir_acl
 315
 316#define i_reserved1     osd1.linux1.l_i_reserved1
 317#define i_frag          osd2.linux2.l_i_frag
 318#define i_fsize         osd2.linux2.l_i_fsize
 319#define i_uid_low       i_uid
 320#define i_gid_low       i_gid
 321#define i_uid_high      osd2.linux2.l_i_uid_high
 322#define i_gid_high      osd2.linux2.l_i_gid_high
 323#define i_reserved2     osd2.linux2.l_i_reserved2
 324
 325/*
 326 * File system states
 327 */
 328#define EXT3_VALID_FS                   0x0001  /* Unmounted cleanly */
 329#define EXT3_ERROR_FS                   0x0002  /* Errors detected */
 330#define EXT3_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 331
 332/*
 333 * Misc. filesystem flags
 334 */
 335#define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
 336#define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
 337#define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
 338
 339/*
 340 * Mount flags
 341 */
 342#define EXT3_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 343/* EXT3_MOUNT_OLDALLOC was there */
 344#define EXT3_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 345#define EXT3_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 346#define EXT3_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 347#define EXT3_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 348#define EXT3_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 349#define EXT3_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 350#define EXT3_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 351#define EXT3_MOUNT_ABORT                0x00200 /* Fatal error detected */
 352#define EXT3_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 353#define EXT3_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 354#define EXT3_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 355#define EXT3_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 356#define EXT3_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 357#define EXT3_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 358#define EXT3_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 359#define EXT3_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 360#define EXT3_MOUNT_RESERVATION          0x10000 /* Preallocation */
 361#define EXT3_MOUNT_BARRIER              0x20000 /* Use block barriers */
 362#define EXT3_MOUNT_QUOTA                0x80000 /* Some quota option set */
 363#define EXT3_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 364#define EXT3_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 365#define EXT3_MOUNT_DATA_ERR_ABORT       0x400000 /* Abort on file data write
 366                                                  * error in ordered mode */
 367
 368/* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
 369#ifndef _LINUX_EXT2_FS_H
 370#define clear_opt(o, opt)               o &= ~EXT3_MOUNT_##opt
 371#define set_opt(o, opt)                 o |= EXT3_MOUNT_##opt
 372#define test_opt(sb, opt)               (EXT3_SB(sb)->s_mount_opt & \
 373                                         EXT3_MOUNT_##opt)
 374#else
 375#define EXT2_MOUNT_NOLOAD               EXT3_MOUNT_NOLOAD
 376#define EXT2_MOUNT_ABORT                EXT3_MOUNT_ABORT
 377#define EXT2_MOUNT_DATA_FLAGS           EXT3_MOUNT_DATA_FLAGS
 378#endif
 379
 380#define ext3_set_bit                    __set_bit_le
 381#define ext3_set_bit_atomic             ext2_set_bit_atomic
 382#define ext3_clear_bit                  __clear_bit_le
 383#define ext3_clear_bit_atomic           ext2_clear_bit_atomic
 384#define ext3_test_bit                   test_bit_le
 385#define ext3_find_next_zero_bit         find_next_zero_bit_le
 386
 387/*
 388 * Maximal mount counts between two filesystem checks
 389 */
 390#define EXT3_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 391#define EXT3_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 392
 393/*
 394 * Behaviour when detecting errors
 395 */
 396#define EXT3_ERRORS_CONTINUE            1       /* Continue execution */
 397#define EXT3_ERRORS_RO                  2       /* Remount fs read-only */
 398#define EXT3_ERRORS_PANIC               3       /* Panic */
 399#define EXT3_ERRORS_DEFAULT             EXT3_ERRORS_CONTINUE
 400
 401/*
 402 * Structure of the super block
 403 */
 404struct ext3_super_block {
 405/*00*/  __le32  s_inodes_count;         /* Inodes count */
 406        __le32  s_blocks_count;         /* Blocks count */
 407        __le32  s_r_blocks_count;       /* Reserved blocks count */
 408        __le32  s_free_blocks_count;    /* Free blocks count */
 409/*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 410        __le32  s_first_data_block;     /* First Data Block */
 411        __le32  s_log_block_size;       /* Block size */
 412        __le32  s_log_frag_size;        /* Fragment size */
 413/*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 414        __le32  s_frags_per_group;      /* # Fragments per group */
 415        __le32  s_inodes_per_group;     /* # Inodes per group */
 416        __le32  s_mtime;                /* Mount time */
 417/*30*/  __le32  s_wtime;                /* Write time */
 418        __le16  s_mnt_count;            /* Mount count */
 419        __le16  s_max_mnt_count;        /* Maximal mount count */
 420        __le16  s_magic;                /* Magic signature */
 421        __le16  s_state;                /* File system state */
 422        __le16  s_errors;               /* Behaviour when detecting errors */
 423        __le16  s_minor_rev_level;      /* minor revision level */
 424/*40*/  __le32  s_lastcheck;            /* time of last check */
 425        __le32  s_checkinterval;        /* max. time between checks */
 426        __le32  s_creator_os;           /* OS */
 427        __le32  s_rev_level;            /* Revision level */
 428/*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 429        __le16  s_def_resgid;           /* Default gid for reserved blocks */
 430        /*
 431         * These fields are for EXT3_DYNAMIC_REV superblocks only.
 432         *
 433         * Note: the difference between the compatible feature set and
 434         * the incompatible feature set is that if there is a bit set
 435         * in the incompatible feature set that the kernel doesn't
 436         * know about, it should refuse to mount the filesystem.
 437         *
 438         * e2fsck's requirements are more strict; if it doesn't know
 439         * about a feature in either the compatible or incompatible
 440         * feature set, it must abort and not try to meddle with
 441         * things it doesn't understand...
 442         */
 443        __le32  s_first_ino;            /* First non-reserved inode */
 444        __le16   s_inode_size;          /* size of inode structure */
 445        __le16  s_block_group_nr;       /* block group # of this superblock */
 446        __le32  s_feature_compat;       /* compatible feature set */
 447/*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 448        __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 449/*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 450/*78*/  char    s_volume_name[16];      /* volume name */
 451/*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 452/*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 453        /*
 454         * Performance hints.  Directory preallocation should only
 455         * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 456         */
 457        __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 458        __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 459        __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 460        /*
 461         * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
 462         */
 463/*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 464/*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 465        __le32  s_journal_dev;          /* device number of journal file */
 466        __le32  s_last_orphan;          /* start of list of inodes to delete */
 467        __le32  s_hash_seed[4];         /* HTREE hash seed */
 468        __u8    s_def_hash_version;     /* Default hash version to use */
 469        __u8    s_reserved_char_pad;
 470        __u16   s_reserved_word_pad;
 471        __le32  s_default_mount_opts;
 472        __le32  s_first_meta_bg;        /* First metablock block group */
 473        __le32  s_mkfs_time;            /* When the filesystem was created */
 474        __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 475        /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 476/*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 477        __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 478        __le32  s_free_blocks_count_hi; /* Free blocks count */
 479        __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
 480        __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
 481        __le32  s_flags;                /* Miscellaneous flags */
 482        __le16  s_raid_stride;          /* RAID stride */
 483        __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */
 484        __le64  s_mmp_block;            /* Block for multi-mount protection */
 485        __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 486        __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
 487        __u8    s_reserved_char_pad2;
 488        __le16  s_reserved_pad;
 489        __u32   s_reserved[162];        /* Padding to the end of the block */
 490};
 491
 492/* data type for block offset of block group */
 493typedef int ext3_grpblk_t;
 494
 495/* data type for filesystem-wide blocks number */
 496typedef unsigned long ext3_fsblk_t;
 497
 498#define E3FSBLK "%lu"
 499
 500struct ext3_reserve_window {
 501        ext3_fsblk_t    _rsv_start;     /* First byte reserved */
 502        ext3_fsblk_t    _rsv_end;       /* Last byte reserved or 0 */
 503};
 504
 505struct ext3_reserve_window_node {
 506        struct rb_node          rsv_node;
 507        __u32                   rsv_goal_size;
 508        __u32                   rsv_alloc_hit;
 509        struct ext3_reserve_window      rsv_window;
 510};
 511
 512struct ext3_block_alloc_info {
 513        /* information about reservation window */
 514        struct ext3_reserve_window_node rsv_window_node;
 515        /*
 516         * was i_next_alloc_block in ext3_inode_info
 517         * is the logical (file-relative) number of the
 518         * most-recently-allocated block in this file.
 519         * We use this for detecting linearly ascending allocation requests.
 520         */
 521        __u32                   last_alloc_logical_block;
 522        /*
 523         * Was i_next_alloc_goal in ext3_inode_info
 524         * is the *physical* companion to i_next_alloc_block.
 525         * it the physical block number of the block which was most-recentl
 526         * allocated to this file.  This give us the goal (target) for the next
 527         * allocation when we detect linearly ascending requests.
 528         */
 529        ext3_fsblk_t            last_alloc_physical_block;
 530};
 531
 532#define rsv_start rsv_window._rsv_start
 533#define rsv_end rsv_window._rsv_end
 534
 535/*
 536 * third extended file system inode data in memory
 537 */
 538struct ext3_inode_info {
 539        __le32  i_data[15];     /* unconverted */
 540        __u32   i_flags;
 541#ifdef EXT3_FRAGMENTS
 542        __u32   i_faddr;
 543        __u8    i_frag_no;
 544        __u8    i_frag_size;
 545#endif
 546        ext3_fsblk_t    i_file_acl;
 547        __u32   i_dir_acl;
 548        __u32   i_dtime;
 549
 550        /*
 551         * i_block_group is the number of the block group which contains
 552         * this file's inode.  Constant across the lifetime of the inode,
 553         * it is ued for making block allocation decisions - we try to
 554         * place a file's data blocks near its inode block, and new inodes
 555         * near to their parent directory's inode.
 556         */
 557        __u32   i_block_group;
 558        unsigned long   i_state_flags;  /* Dynamic state flags for ext3 */
 559
 560        /* block reservation info */
 561        struct ext3_block_alloc_info *i_block_alloc_info;
 562
 563        __u32   i_dir_start_lookup;
 564#ifdef CONFIG_EXT3_FS_XATTR
 565        /*
 566         * Extended attributes can be read independently of the main file
 567         * data. Taking i_mutex even when reading would cause contention
 568         * between readers of EAs and writers of regular file data, so
 569         * instead we synchronize on xattr_sem when reading or changing
 570         * EAs.
 571         */
 572        struct rw_semaphore xattr_sem;
 573#endif
 574
 575        struct list_head i_orphan;      /* unlinked but open inodes */
 576
 577        /*
 578         * i_disksize keeps track of what the inode size is ON DISK, not
 579         * in memory.  During truncate, i_size is set to the new size by
 580         * the VFS prior to calling ext3_truncate(), but the filesystem won't
 581         * set i_disksize to 0 until the truncate is actually under way.
 582         *
 583         * The intent is that i_disksize always represents the blocks which
 584         * are used by this file.  This allows recovery to restart truncate
 585         * on orphans if we crash during truncate.  We actually write i_disksize
 586         * into the on-disk inode when writing inodes out, instead of i_size.
 587         *
 588         * The only time when i_disksize and i_size may be different is when
 589         * a truncate is in progress.  The only things which change i_disksize
 590         * are ext3_get_block (growth) and ext3_truncate (shrinkth).
 591         */
 592        loff_t  i_disksize;
 593
 594        /* on-disk additional length */
 595        __u16 i_extra_isize;
 596
 597        /*
 598         * truncate_mutex is for serialising ext3_truncate() against
 599         * ext3_getblock().  In the 2.4 ext2 design, great chunks of inode's
 600         * data tree are chopped off during truncate. We can't do that in
 601         * ext3 because whenever we perform intermediate commits during
 602         * truncate, the inode and all the metadata blocks *must* be in a
 603         * consistent state which allows truncation of the orphans to restart
 604         * during recovery.  Hence we must fix the get_block-vs-truncate race
 605         * by other means, so we have truncate_mutex.
 606         */
 607        struct mutex truncate_mutex;
 608
 609        /*
 610         * Transactions that contain inode's metadata needed to complete
 611         * fsync and fdatasync, respectively.
 612         */
 613        atomic_t i_sync_tid;
 614        atomic_t i_datasync_tid;
 615
 616        struct inode vfs_inode;
 617};
 618
 619/*
 620 * third extended-fs super-block data in memory
 621 */
 622struct ext3_sb_info {
 623        unsigned long s_frag_size;      /* Size of a fragment in bytes */
 624        unsigned long s_frags_per_block;/* Number of fragments per block */
 625        unsigned long s_inodes_per_block;/* Number of inodes per block */
 626        unsigned long s_frags_per_group;/* Number of fragments in a group */
 627        unsigned long s_blocks_per_group;/* Number of blocks in a group */
 628        unsigned long s_inodes_per_group;/* Number of inodes in a group */
 629        unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
 630        unsigned long s_gdb_count;      /* Number of group descriptor blocks */
 631        unsigned long s_desc_per_block; /* Number of group descriptors per block */
 632        unsigned long s_groups_count;   /* Number of groups in the fs */
 633        unsigned long s_overhead_last;  /* Last calculated overhead */
 634        unsigned long s_blocks_last;    /* Last seen block count */
 635        struct buffer_head * s_sbh;     /* Buffer containing the super block */
 636        struct ext3_super_block * s_es; /* Pointer to the super block in the buffer */
 637        struct buffer_head ** s_group_desc;
 638        unsigned long  s_mount_opt;
 639        ext3_fsblk_t s_sb_block;
 640        kuid_t s_resuid;
 641        kgid_t s_resgid;
 642        unsigned short s_mount_state;
 643        unsigned short s_pad;
 644        int s_addr_per_block_bits;
 645        int s_desc_per_block_bits;
 646        int s_inode_size;
 647        int s_first_ino;
 648        spinlock_t s_next_gen_lock;
 649        u32 s_next_generation;
 650        u32 s_hash_seed[4];
 651        int s_def_hash_version;
 652        int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
 653        struct percpu_counter s_freeblocks_counter;
 654        struct percpu_counter s_freeinodes_counter;
 655        struct percpu_counter s_dirs_counter;
 656        struct blockgroup_lock *s_blockgroup_lock;
 657
 658        /* root of the per fs reservation window tree */
 659        spinlock_t s_rsv_window_lock;
 660        struct rb_root s_rsv_window_root;
 661        struct ext3_reserve_window_node s_rsv_window_head;
 662
 663        /* Journaling */
 664        struct inode * s_journal_inode;
 665        struct journal_s * s_journal;
 666        struct list_head s_orphan;
 667        struct mutex s_orphan_lock;
 668        struct mutex s_resize_lock;
 669        unsigned long s_commit_interval;
 670        struct block_device *journal_bdev;
 671#ifdef CONFIG_QUOTA
 672        char *s_qf_names[MAXQUOTAS];            /* Names of quota files with journalled quota */
 673        int s_jquota_fmt;                       /* Format of quota to use */
 674#endif
 675};
 676
 677static inline spinlock_t *
 678sb_bgl_lock(struct ext3_sb_info *sbi, unsigned int block_group)
 679{
 680        return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
 681}
 682
 683static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
 684{
 685        return sb->s_fs_info;
 686}
 687static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
 688{
 689        return container_of(inode, struct ext3_inode_info, vfs_inode);
 690}
 691
 692static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
 693{
 694        return ino == EXT3_ROOT_INO ||
 695                ino == EXT3_JOURNAL_INO ||
 696                ino == EXT3_RESIZE_INO ||
 697                (ino >= EXT3_FIRST_INO(sb) &&
 698                 ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
 699}
 700
 701/*
 702 * Inode dynamic state flags
 703 */
 704enum {
 705        EXT3_STATE_JDATA,               /* journaled data exists */
 706        EXT3_STATE_NEW,                 /* inode is newly created */
 707        EXT3_STATE_XATTR,               /* has in-inode xattrs */
 708        EXT3_STATE_FLUSH_ON_CLOSE,      /* flush dirty pages on close */
 709};
 710
 711static inline int ext3_test_inode_state(struct inode *inode, int bit)
 712{
 713        return test_bit(bit, &EXT3_I(inode)->i_state_flags);
 714}
 715
 716static inline void ext3_set_inode_state(struct inode *inode, int bit)
 717{
 718        set_bit(bit, &EXT3_I(inode)->i_state_flags);
 719}
 720
 721static inline void ext3_clear_inode_state(struct inode *inode, int bit)
 722{
 723        clear_bit(bit, &EXT3_I(inode)->i_state_flags);
 724}
 725
 726#define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
 727
 728/*
 729 * Codes for operating systems
 730 */
 731#define EXT3_OS_LINUX           0
 732#define EXT3_OS_HURD            1
 733#define EXT3_OS_MASIX           2
 734#define EXT3_OS_FREEBSD         3
 735#define EXT3_OS_LITES           4
 736
 737/*
 738 * Revision levels
 739 */
 740#define EXT3_GOOD_OLD_REV       0       /* The good old (original) format */
 741#define EXT3_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 742
 743#define EXT3_CURRENT_REV        EXT3_GOOD_OLD_REV
 744#define EXT3_MAX_SUPP_REV       EXT3_DYNAMIC_REV
 745
 746#define EXT3_GOOD_OLD_INODE_SIZE 128
 747
 748/*
 749 * Feature set definitions
 750 */
 751
 752#define EXT3_HAS_COMPAT_FEATURE(sb,mask)                        \
 753        ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 754#define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 755        ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 756#define EXT3_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 757        ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 758#define EXT3_SET_COMPAT_FEATURE(sb,mask)                        \
 759        EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 760#define EXT3_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 761        EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 762#define EXT3_SET_INCOMPAT_FEATURE(sb,mask)                      \
 763        EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 764#define EXT3_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 765        EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 766#define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 767        EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 768#define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 769        EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 770
 771#define EXT3_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 772#define EXT3_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 773#define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 774#define EXT3_FEATURE_COMPAT_EXT_ATTR            0x0008
 775#define EXT3_FEATURE_COMPAT_RESIZE_INODE        0x0010
 776#define EXT3_FEATURE_COMPAT_DIR_INDEX           0x0020
 777
 778#define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 779#define EXT3_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 780#define EXT3_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 781
 782#define EXT3_FEATURE_INCOMPAT_COMPRESSION       0x0001
 783#define EXT3_FEATURE_INCOMPAT_FILETYPE          0x0002
 784#define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 785#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 786#define EXT3_FEATURE_INCOMPAT_META_BG           0x0010
 787
 788#define EXT3_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 789#define EXT3_FEATURE_INCOMPAT_SUPP      (EXT3_FEATURE_INCOMPAT_FILETYPE| \
 790                                         EXT3_FEATURE_INCOMPAT_RECOVER| \
 791                                         EXT3_FEATURE_INCOMPAT_META_BG)
 792#define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 793                                         EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
 794                                         EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
 795
 796/*
 797 * Default values for user and/or group using reserved blocks
 798 */
 799#define EXT3_DEF_RESUID         0
 800#define EXT3_DEF_RESGID         0
 801
 802/*
 803 * Default mount options
 804 */
 805#define EXT3_DEFM_DEBUG         0x0001
 806#define EXT3_DEFM_BSDGROUPS     0x0002
 807#define EXT3_DEFM_XATTR_USER    0x0004
 808#define EXT3_DEFM_ACL           0x0008
 809#define EXT3_DEFM_UID16         0x0010
 810#define EXT3_DEFM_JMODE         0x0060
 811#define EXT3_DEFM_JMODE_DATA    0x0020
 812#define EXT3_DEFM_JMODE_ORDERED 0x0040
 813#define EXT3_DEFM_JMODE_WBACK   0x0060
 814
 815/*
 816 * Structure of a directory entry
 817 */
 818#define EXT3_NAME_LEN 255
 819
 820struct ext3_dir_entry {
 821        __le32  inode;                  /* Inode number */
 822        __le16  rec_len;                /* Directory entry length */
 823        __le16  name_len;               /* Name length */
 824        char    name[EXT3_NAME_LEN];    /* File name */
 825};
 826
 827/*
 828 * The new version of the directory entry.  Since EXT3 structures are
 829 * stored in intel byte order, and the name_len field could never be
 830 * bigger than 255 chars, it's safe to reclaim the extra byte for the
 831 * file_type field.
 832 */
 833struct ext3_dir_entry_2 {
 834        __le32  inode;                  /* Inode number */
 835        __le16  rec_len;                /* Directory entry length */
 836        __u8    name_len;               /* Name length */
 837        __u8    file_type;
 838        char    name[EXT3_NAME_LEN];    /* File name */
 839};
 840
 841/*
 842 * Ext3 directory file types.  Only the low 3 bits are used.  The
 843 * other bits are reserved for now.
 844 */
 845#define EXT3_FT_UNKNOWN         0
 846#define EXT3_FT_REG_FILE        1
 847#define EXT3_FT_DIR             2
 848#define EXT3_FT_CHRDEV          3
 849#define EXT3_FT_BLKDEV          4
 850#define EXT3_FT_FIFO            5
 851#define EXT3_FT_SOCK            6
 852#define EXT3_FT_SYMLINK         7
 853
 854#define EXT3_FT_MAX             8
 855
 856/*
 857 * EXT3_DIR_PAD defines the directory entries boundaries
 858 *
 859 * NOTE: It must be a multiple of 4
 860 */
 861#define EXT3_DIR_PAD                    4
 862#define EXT3_DIR_ROUND                  (EXT3_DIR_PAD - 1)
 863#define EXT3_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT3_DIR_ROUND) & \
 864                                         ~EXT3_DIR_ROUND)
 865#define EXT3_MAX_REC_LEN                ((1<<16)-1)
 866
 867/*
 868 * Tests against MAX_REC_LEN etc were put in place for 64k block
 869 * sizes; if that is not possible on this arch, we can skip
 870 * those tests and speed things up.
 871 */
 872static inline unsigned ext3_rec_len_from_disk(__le16 dlen)
 873{
 874        unsigned len = le16_to_cpu(dlen);
 875
 876#if (PAGE_CACHE_SIZE >= 65536)
 877        if (len == EXT3_MAX_REC_LEN)
 878                return 1 << 16;
 879#endif
 880        return len;
 881}
 882
 883static inline __le16 ext3_rec_len_to_disk(unsigned len)
 884{
 885#if (PAGE_CACHE_SIZE >= 65536)
 886        if (len == (1 << 16))
 887                return cpu_to_le16(EXT3_MAX_REC_LEN);
 888        else if (len > (1 << 16))
 889                BUG();
 890#endif
 891        return cpu_to_le16(len);
 892}
 893
 894/*
 895 * Hash Tree Directory indexing
 896 * (c) Daniel Phillips, 2001
 897 */
 898
 899#define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
 900                                      EXT3_FEATURE_COMPAT_DIR_INDEX) && \
 901                      (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
 902#define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
 903#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 904
 905/* Legal values for the dx_root hash_version field: */
 906
 907#define DX_HASH_LEGACY          0
 908#define DX_HASH_HALF_MD4        1
 909#define DX_HASH_TEA             2
 910#define DX_HASH_LEGACY_UNSIGNED 3
 911#define DX_HASH_HALF_MD4_UNSIGNED       4
 912#define DX_HASH_TEA_UNSIGNED            5
 913
 914/* hash info structure used by the directory hash */
 915struct dx_hash_info
 916{
 917        u32             hash;
 918        u32             minor_hash;
 919        int             hash_version;
 920        u32             *seed;
 921};
 922
 923
 924/* 32 and 64 bit signed EOF for dx directories */
 925#define EXT3_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
 926#define EXT3_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
 927
 928
 929/*
 930 * Control parameters used by ext3_htree_next_block
 931 */
 932#define HASH_NB_ALWAYS          1
 933
 934
 935/*
 936 * Describe an inode's exact location on disk and in memory
 937 */
 938struct ext3_iloc
 939{
 940        struct buffer_head *bh;
 941        unsigned long offset;
 942        unsigned long block_group;
 943};
 944
 945static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
 946{
 947        return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
 948}
 949
 950/*
 951 * This structure is stuffed into the struct file's private_data field
 952 * for directories.  It is where we put information so that we can do
 953 * readdir operations in hash tree order.
 954 */
 955struct dir_private_info {
 956        struct rb_root  root;
 957        struct rb_node  *curr_node;
 958        struct fname    *extra_fname;
 959        loff_t          last_pos;
 960        __u32           curr_hash;
 961        __u32           curr_minor_hash;
 962        __u32           next_hash;
 963};
 964
 965/* calculate the first block number of the group */
 966static inline ext3_fsblk_t
 967ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
 968{
 969        return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
 970                le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
 971}
 972
 973/*
 974 * Special error return code only used by dx_probe() and its callers.
 975 */
 976#define ERR_BAD_DX_DIR  -75000
 977
 978/*
 979 * Function prototypes
 980 */
 981
 982/*
 983 * Ok, these declarations are also in <linux/kernel.h> but none of the
 984 * ext3 source programs needs to include it so they are duplicated here.
 985 */
 986# define NORET_TYPE    /**/
 987# define ATTRIB_NORET  __attribute__((noreturn))
 988# define NORET_AND     noreturn,
 989
 990/* balloc.c */
 991extern int ext3_bg_has_super(struct super_block *sb, int group);
 992extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
 993extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
 994                        ext3_fsblk_t goal, int *errp);
 995extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
 996                        ext3_fsblk_t goal, unsigned long *count, int *errp);
 997extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
 998                        ext3_fsblk_t block, unsigned long count);
 999extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
1000                                 ext3_fsblk_t block, unsigned long count,
1001                                unsigned long *pdquot_freed_blocks);
1002extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
1003extern void ext3_check_blocks_bitmap (struct super_block *);
1004extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
1005                                                    unsigned int block_group,
1006                                                    struct buffer_head ** bh);
1007extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
1008extern void ext3_init_block_alloc_info(struct inode *);
1009extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
1010extern int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range);
1011
1012/* dir.c */
1013extern int ext3_check_dir_entry(const char *, struct inode *,
1014                                struct ext3_dir_entry_2 *,
1015                                struct buffer_head *, unsigned long);
1016extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
1017                                    __u32 minor_hash,
1018                                    struct ext3_dir_entry_2 *dirent);
1019extern void ext3_htree_free_dir_info(struct dir_private_info *p);
1020
1021/* fsync.c */
1022extern int ext3_sync_file(struct file *, loff_t, loff_t, int);
1023
1024/* hash.c */
1025extern int ext3fs_dirhash(const char *name, int len, struct
1026                          dx_hash_info *hinfo);
1027
1028/* ialloc.c */
1029extern struct inode * ext3_new_inode (handle_t *, struct inode *,
1030                                      const struct qstr *, umode_t);
1031extern void ext3_free_inode (handle_t *, struct inode *);
1032extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
1033extern unsigned long ext3_count_free_inodes (struct super_block *);
1034extern unsigned long ext3_count_dirs (struct super_block *);
1035extern void ext3_check_inodes_bitmap (struct super_block *);
1036extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
1037
1038
1039/* inode.c */
1040int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
1041                struct buffer_head *bh, ext3_fsblk_t blocknr);
1042struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
1043struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
1044int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
1045        sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
1046        int create);
1047
1048extern struct inode *ext3_iget(struct super_block *, unsigned long);
1049extern int  ext3_write_inode (struct inode *, struct writeback_control *);
1050extern int  ext3_setattr (struct dentry *, struct iattr *);
1051extern void ext3_evict_inode (struct inode *);
1052extern int  ext3_sync_inode (handle_t *, struct inode *);
1053extern void ext3_discard_reservation (struct inode *);
1054extern void ext3_dirty_inode(struct inode *, int);
1055extern int ext3_change_inode_journal_flag(struct inode *, int);
1056extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
1057extern int ext3_can_truncate(struct inode *inode);
1058extern void ext3_truncate(struct inode *inode);
1059extern void ext3_set_inode_flags(struct inode *);
1060extern void ext3_get_inode_flags(struct ext3_inode_info *);
1061extern void ext3_set_aops(struct inode *inode);
1062extern int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1063                       u64 start, u64 len);
1064
1065/* ioctl.c */
1066extern long ext3_ioctl(struct file *, unsigned int, unsigned long);
1067extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long);
1068
1069/* namei.c */
1070extern int ext3_orphan_add(handle_t *, struct inode *);
1071extern int ext3_orphan_del(handle_t *, struct inode *);
1072extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1073                                __u32 start_minor_hash, __u32 *next_hash);
1074
1075/* resize.c */
1076extern int ext3_group_add(struct super_block *sb,
1077                                struct ext3_new_group_data *input);
1078extern int ext3_group_extend(struct super_block *sb,
1079                                struct ext3_super_block *es,
1080                                ext3_fsblk_t n_blocks_count);
1081
1082/* super.c */
1083extern __printf(3, 4)
1084void ext3_error(struct super_block *, const char *, const char *, ...);
1085extern void __ext3_std_error (struct super_block *, const char *, int);
1086extern __printf(3, 4)
1087void ext3_abort(struct super_block *, const char *, const char *, ...);
1088extern __printf(3, 4)
1089void ext3_warning(struct super_block *, const char *, const char *, ...);
1090extern __printf(3, 4)
1091void ext3_msg(struct super_block *, const char *, const char *, ...);
1092extern void ext3_update_dynamic_rev (struct super_block *sb);
1093
1094#define ext3_std_error(sb, errno)                               \
1095do {                                                            \
1096        if ((errno))                                            \
1097                __ext3_std_error((sb), __func__, (errno));      \
1098} while (0)
1099
1100/*
1101 * Inodes and files operations
1102 */
1103
1104/* dir.c */
1105extern const struct file_operations ext3_dir_operations;
1106
1107/* file.c */
1108extern const struct inode_operations ext3_file_inode_operations;
1109extern const struct file_operations ext3_file_operations;
1110
1111/* namei.c */
1112extern const struct inode_operations ext3_dir_inode_operations;
1113extern const struct inode_operations ext3_special_inode_operations;
1114
1115/* symlink.c */
1116extern const struct inode_operations ext3_symlink_inode_operations;
1117extern const struct inode_operations ext3_fast_symlink_inode_operations;
1118
1119#define EXT3_JOURNAL(inode)     (EXT3_SB((inode)->i_sb)->s_journal)
1120
1121/* Define the number of blocks we need to account to a transaction to
1122 * modify one block of data.
1123 *
1124 * We may have to touch one inode, one bitmap buffer, up to three
1125 * indirection blocks, the group and superblock summaries, and the data
1126 * block to complete the transaction.  */
1127
1128#define EXT3_SINGLEDATA_TRANS_BLOCKS    8U
1129
1130/* Extended attribute operations touch at most two data buffers,
1131 * two bitmap buffers, and two group summaries, in addition to the inode
1132 * and the superblock, which are already accounted for. */
1133
1134#define EXT3_XATTR_TRANS_BLOCKS         6U
1135
1136/* Define the minimum size for a transaction which modifies data.  This
1137 * needs to take into account the fact that we may end up modifying two
1138 * quota files too (one for the group, one for the user quota).  The
1139 * superblock only gets updated once, of course, so don't bother
1140 * counting that again for the quota updates. */
1141
1142#define EXT3_DATA_TRANS_BLOCKS(sb)      (EXT3_SINGLEDATA_TRANS_BLOCKS + \
1143                                         EXT3_XATTR_TRANS_BLOCKS - 2 + \
1144                                         EXT3_MAXQUOTAS_TRANS_BLOCKS(sb))
1145
1146/* Delete operations potentially hit one directory's namespace plus an
1147 * entire inode, plus arbitrary amounts of bitmap/indirection data.  Be
1148 * generous.  We can grow the delete transaction later if necessary. */
1149
1150#define EXT3_DELETE_TRANS_BLOCKS(sb)   (EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) + 64)
1151
1152/* Define an arbitrary limit for the amount of data we will anticipate
1153 * writing to any given transaction.  For unbounded transactions such as
1154 * write(2) and truncate(2) we can write more than this, but we always
1155 * start off at the maximum transaction size and grow the transaction
1156 * optimistically as we go. */
1157
1158#define EXT3_MAX_TRANS_DATA             64U
1159
1160/* We break up a large truncate or write transaction once the handle's
1161 * buffer credits gets this low, we need either to extend the
1162 * transaction or to start a new one.  Reserve enough space here for
1163 * inode, bitmap, superblock, group and indirection updates for at least
1164 * one block, plus two quota updates.  Quota allocations are not
1165 * needed. */
1166
1167#define EXT3_RESERVE_TRANS_BLOCKS       12U
1168
1169#define EXT3_INDEX_EXTRA_TRANS_BLOCKS   8
1170
1171#ifdef CONFIG_QUOTA
1172/* Amount of blocks needed for quota update - we know that the structure was
1173 * allocated so we need to update only inode+data */
1174#define EXT3_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
1175/* Amount of blocks needed for quota insert/delete - we do some block writes
1176 * but inode, sb and group updates are done only once */
1177#define EXT3_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
1178                (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0)
1179#define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
1180                (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0)
1181#else
1182#define EXT3_QUOTA_TRANS_BLOCKS(sb) 0
1183#define EXT3_QUOTA_INIT_BLOCKS(sb) 0
1184#define EXT3_QUOTA_DEL_BLOCKS(sb) 0
1185#endif
1186#define EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_TRANS_BLOCKS(sb))
1187#define EXT3_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_INIT_BLOCKS(sb))
1188#define EXT3_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_DEL_BLOCKS(sb))
1189
1190int
1191ext3_mark_iloc_dirty(handle_t *handle,
1192                     struct inode *inode,
1193                     struct ext3_iloc *iloc);
1194
1195/*
1196 * On success, We end up with an outstanding reference count against
1197 * iloc->bh.  This _must_ be cleaned up later.
1198 */
1199
1200int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
1201                        struct ext3_iloc *iloc);
1202
1203int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);
1204
1205/*
1206 * Wrapper functions with which ext3 calls into JBD.  The intent here is
1207 * to allow these to be turned into appropriate stubs so ext3 can control
1208 * ext2 filesystems, so ext2+ext3 systems only nee one fs.  This work hasn't
1209 * been done yet.
1210 */
1211
1212static inline void ext3_journal_release_buffer(handle_t *handle,
1213                                                struct buffer_head *bh)
1214{
1215        journal_release_buffer(handle, bh);
1216}
1217
1218void ext3_journal_abort_handle(const char *caller, const char *err_fn,
1219                struct buffer_head *bh, handle_t *handle, int err);
1220
1221int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
1222                                struct buffer_head *bh);
1223
1224int __ext3_journal_get_write_access(const char *where, handle_t *handle,
1225                                struct buffer_head *bh);
1226
1227int __ext3_journal_forget(const char *where, handle_t *handle,
1228                                struct buffer_head *bh);
1229
1230int __ext3_journal_revoke(const char *where, handle_t *handle,
1231                                unsigned long blocknr, struct buffer_head *bh);
1232
1233int __ext3_journal_get_create_access(const char *where,
1234                                handle_t *handle, struct buffer_head *bh);
1235
1236int __ext3_journal_dirty_metadata(const char *where,
1237                                handle_t *handle, struct buffer_head *bh);
1238
1239#define ext3_journal_get_undo_access(handle, bh) \
1240        __ext3_journal_get_undo_access(__func__, (handle), (bh))
1241#define ext3_journal_get_write_access(handle, bh) \
1242        __ext3_journal_get_write_access(__func__, (handle), (bh))
1243#define ext3_journal_revoke(handle, blocknr, bh) \
1244        __ext3_journal_revoke(__func__, (handle), (blocknr), (bh))
1245#define ext3_journal_get_create_access(handle, bh) \
1246        __ext3_journal_get_create_access(__func__, (handle), (bh))
1247#define ext3_journal_dirty_metadata(handle, bh) \
1248        __ext3_journal_dirty_metadata(__func__, (handle), (bh))
1249#define ext3_journal_forget(handle, bh) \
1250        __ext3_journal_forget(__func__, (handle), (bh))
1251
1252int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
1253
1254handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
1255int __ext3_journal_stop(const char *where, handle_t *handle);
1256
1257static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
1258{
1259        return ext3_journal_start_sb(inode->i_sb, nblocks);
1260}
1261
1262#define ext3_journal_stop(handle) \
1263        __ext3_journal_stop(__func__, (handle))
1264
1265static inline handle_t *ext3_journal_current_handle(void)
1266{
1267        return journal_current_handle();
1268}
1269
1270static inline int ext3_journal_extend(handle_t *handle, int nblocks)
1271{
1272        return journal_extend(handle, nblocks);
1273}
1274
1275static inline int ext3_journal_restart(handle_t *handle, int nblocks)
1276{
1277        return journal_restart(handle, nblocks);
1278}
1279
1280static inline int ext3_journal_blocks_per_page(struct inode *inode)
1281{
1282        return journal_blocks_per_page(inode);
1283}
1284
1285static inline int ext3_journal_force_commit(journal_t *journal)
1286{
1287        return journal_force_commit(journal);
1288}
1289
1290/* super.c */
1291int ext3_force_commit(struct super_block *sb);
1292
1293static inline int ext3_should_journal_data(struct inode *inode)
1294{
1295        if (!S_ISREG(inode->i_mode))
1296                return 1;
1297        if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
1298                return 1;
1299        if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
1300                return 1;
1301        return 0;
1302}
1303
1304static inline int ext3_should_order_data(struct inode *inode)
1305{
1306        if (!S_ISREG(inode->i_mode))
1307                return 0;
1308        if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
1309                return 0;
1310        if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
1311                return 1;
1312        return 0;
1313}
1314
1315static inline int ext3_should_writeback_data(struct inode *inode)
1316{
1317        if (!S_ISREG(inode->i_mode))
1318                return 0;
1319        if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
1320                return 0;
1321        if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
1322                return 1;
1323        return 0;
1324}
1325
1326#include <trace/events/ext3.h>
1327
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