Version:  2.0.40 2.2.26 2.4.37 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0

Linux/fs/ext3/ext3.h

  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  */
102 struct 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. */
173 static 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 */
184 struct 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 */
195 struct 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 /* Number of supported quota types */
241 #define EXT3_MAXQUOTAS 2
242 
243 /*
244  *  Mount options
245  */
246 struct ext3_mount_options {
247         unsigned long s_mount_opt;
248         kuid_t s_resuid;
249         kgid_t s_resgid;
250         unsigned long s_commit_interval;
251 #ifdef CONFIG_QUOTA
252         int s_jquota_fmt;
253         char *s_qf_names[EXT3_MAXQUOTAS];
254 #endif
255 };
256 
257 /*
258  * Structure of an inode on the disk
259  */
260 struct ext3_inode {
261         __le16  i_mode;         /* File mode */
262         __le16  i_uid;          /* Low 16 bits of Owner Uid */
263         __le32  i_size;         /* Size in bytes */
264         __le32  i_atime;        /* Access time */
265         __le32  i_ctime;        /* Creation time */
266         __le32  i_mtime;        /* Modification time */
267         __le32  i_dtime;        /* Deletion Time */
268         __le16  i_gid;          /* Low 16 bits of Group Id */
269         __le16  i_links_count;  /* Links count */
270         __le32  i_blocks;       /* Blocks count */
271         __le32  i_flags;        /* File flags */
272         union {
273                 struct {
274                         __u32  l_i_reserved1;
275                 } linux1;
276                 struct {
277                         __u32  h_i_translator;
278                 } hurd1;
279                 struct {
280                         __u32  m_i_reserved1;
281                 } masix1;
282         } osd1;                         /* OS dependent 1 */
283         __le32  i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
284         __le32  i_generation;   /* File version (for NFS) */
285         __le32  i_file_acl;     /* File ACL */
286         __le32  i_dir_acl;      /* Directory ACL */
287         __le32  i_faddr;        /* Fragment address */
288         union {
289                 struct {
290                         __u8    l_i_frag;       /* Fragment number */
291                         __u8    l_i_fsize;      /* Fragment size */
292                         __u16   i_pad1;
293                         __le16  l_i_uid_high;   /* these 2 fields    */
294                         __le16  l_i_gid_high;   /* were reserved2[0] */
295                         __u32   l_i_reserved2;
296                 } linux2;
297                 struct {
298                         __u8    h_i_frag;       /* Fragment number */
299                         __u8    h_i_fsize;      /* Fragment size */
300                         __u16   h_i_mode_high;
301                         __u16   h_i_uid_high;
302                         __u16   h_i_gid_high;
303                         __u32   h_i_author;
304                 } hurd2;
305                 struct {
306                         __u8    m_i_frag;       /* Fragment number */
307                         __u8    m_i_fsize;      /* Fragment size */
308                         __u16   m_pad1;
309                         __u32   m_i_reserved2[2];
310                 } masix2;
311         } osd2;                         /* OS dependent 2 */
312         __le16  i_extra_isize;
313         __le16  i_pad1;
314 };
315 
316 #define i_size_high     i_dir_acl
317 
318 #define i_reserved1     osd1.linux1.l_i_reserved1
319 #define i_frag          osd2.linux2.l_i_frag
320 #define i_fsize         osd2.linux2.l_i_fsize
321 #define i_uid_low       i_uid
322 #define i_gid_low       i_gid
323 #define i_uid_high      osd2.linux2.l_i_uid_high
324 #define i_gid_high      osd2.linux2.l_i_gid_high
325 #define i_reserved2     osd2.linux2.l_i_reserved2
326 
327 /*
328  * File system states
329  */
330 #define EXT3_VALID_FS                   0x0001  /* Unmounted cleanly */
331 #define EXT3_ERROR_FS                   0x0002  /* Errors detected */
332 #define EXT3_ORPHAN_FS                  0x0004  /* Orphans being recovered */
333 
334 /*
335  * Misc. filesystem flags
336  */
337 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
338 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
339 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
340 
341 /*
342  * Mount flags
343  */
344 #define EXT3_MOUNT_CHECK                0x00001 /* Do mount-time checks */
345 /* EXT3_MOUNT_OLDALLOC was there */
346 #define EXT3_MOUNT_GRPID                0x00004 /* Create files with directory's group */
347 #define EXT3_MOUNT_DEBUG                0x00008 /* Some debugging messages */
348 #define EXT3_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
349 #define EXT3_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
350 #define EXT3_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
351 #define EXT3_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
352 #define EXT3_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
353 #define EXT3_MOUNT_ABORT                0x00200 /* Fatal error detected */
354 #define EXT3_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
355 #define EXT3_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
356 #define EXT3_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
357 #define EXT3_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
358 #define EXT3_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
359 #define EXT3_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
360 #define EXT3_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
361 #define EXT3_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
362 #define EXT3_MOUNT_RESERVATION          0x10000 /* Preallocation */
363 #define EXT3_MOUNT_BARRIER              0x20000 /* Use block barriers */
364 #define EXT3_MOUNT_QUOTA                0x80000 /* Some quota option set */
365 #define EXT3_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
366 #define EXT3_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
367 #define EXT3_MOUNT_DATA_ERR_ABORT       0x400000 /* Abort on file data write
368                                                   * error in ordered mode */
369 
370 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
371 #ifndef _LINUX_EXT2_FS_H
372 #define clear_opt(o, opt)               o &= ~EXT3_MOUNT_##opt
373 #define set_opt(o, opt)                 o |= EXT3_MOUNT_##opt
374 #define test_opt(sb, opt)               (EXT3_SB(sb)->s_mount_opt & \
375                                          EXT3_MOUNT_##opt)
376 #else
377 #define EXT2_MOUNT_NOLOAD               EXT3_MOUNT_NOLOAD
378 #define EXT2_MOUNT_ABORT                EXT3_MOUNT_ABORT
379 #define EXT2_MOUNT_DATA_FLAGS           EXT3_MOUNT_DATA_FLAGS
380 #endif
381 
382 #define ext3_set_bit                    __set_bit_le
383 #define ext3_set_bit_atomic             ext2_set_bit_atomic
384 #define ext3_clear_bit                  __clear_bit_le
385 #define ext3_clear_bit_atomic           ext2_clear_bit_atomic
386 #define ext3_test_bit                   test_bit_le
387 #define ext3_find_next_zero_bit         find_next_zero_bit_le
388 
389 /*
390  * Maximal mount counts between two filesystem checks
391  */
392 #define EXT3_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
393 #define EXT3_DFL_CHECKINTERVAL          0       /* Don't use interval check */
394 
395 /*
396  * Behaviour when detecting errors
397  */
398 #define EXT3_ERRORS_CONTINUE            1       /* Continue execution */
399 #define EXT3_ERRORS_RO                  2       /* Remount fs read-only */
400 #define EXT3_ERRORS_PANIC               3       /* Panic */
401 #define EXT3_ERRORS_DEFAULT             EXT3_ERRORS_CONTINUE
402 
403 /*
404  * Structure of the super block
405  */
406 struct ext3_super_block {
407 /*00*/  __le32  s_inodes_count;         /* Inodes count */
408         __le32  s_blocks_count;         /* Blocks count */
409         __le32  s_r_blocks_count;       /* Reserved blocks count */
410         __le32  s_free_blocks_count;    /* Free blocks count */
411 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
412         __le32  s_first_data_block;     /* First Data Block */
413         __le32  s_log_block_size;       /* Block size */
414         __le32  s_log_frag_size;        /* Fragment size */
415 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
416         __le32  s_frags_per_group;      /* # Fragments per group */
417         __le32  s_inodes_per_group;     /* # Inodes per group */
418         __le32  s_mtime;                /* Mount time */
419 /*30*/  __le32  s_wtime;                /* Write time */
420         __le16  s_mnt_count;            /* Mount count */
421         __le16  s_max_mnt_count;        /* Maximal mount count */
422         __le16  s_magic;                /* Magic signature */
423         __le16  s_state;                /* File system state */
424         __le16  s_errors;               /* Behaviour when detecting errors */
425         __le16  s_minor_rev_level;      /* minor revision level */
426 /*40*/  __le32  s_lastcheck;            /* time of last check */
427         __le32  s_checkinterval;        /* max. time between checks */
428         __le32  s_creator_os;           /* OS */
429         __le32  s_rev_level;            /* Revision level */
430 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
431         __le16  s_def_resgid;           /* Default gid for reserved blocks */
432         /*
433          * These fields are for EXT3_DYNAMIC_REV superblocks only.
434          *
435          * Note: the difference between the compatible feature set and
436          * the incompatible feature set is that if there is a bit set
437          * in the incompatible feature set that the kernel doesn't
438          * know about, it should refuse to mount the filesystem.
439          *
440          * e2fsck's requirements are more strict; if it doesn't know
441          * about a feature in either the compatible or incompatible
442          * feature set, it must abort and not try to meddle with
443          * things it doesn't understand...
444          */
445         __le32  s_first_ino;            /* First non-reserved inode */
446         __le16   s_inode_size;          /* size of inode structure */
447         __le16  s_block_group_nr;       /* block group # of this superblock */
448         __le32  s_feature_compat;       /* compatible feature set */
449 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
450         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
451 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
452 /*78*/  char    s_volume_name[16];      /* volume name */
453 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
454 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
455         /*
456          * Performance hints.  Directory preallocation should only
457          * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
458          */
459         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
460         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
461         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
462         /*
463          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
464          */
465 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
466 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
467         __le32  s_journal_dev;          /* device number of journal file */
468         __le32  s_last_orphan;          /* start of list of inodes to delete */
469         __le32  s_hash_seed[4];         /* HTREE hash seed */
470         __u8    s_def_hash_version;     /* Default hash version to use */
471         __u8    s_reserved_char_pad;
472         __u16   s_reserved_word_pad;
473         __le32  s_default_mount_opts;
474         __le32  s_first_meta_bg;        /* First metablock block group */
475         __le32  s_mkfs_time;            /* When the filesystem was created */
476         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
477         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
478 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
479         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
480         __le32  s_free_blocks_count_hi; /* Free blocks count */
481         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
482         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
483         __le32  s_flags;                /* Miscellaneous flags */
484         __le16  s_raid_stride;          /* RAID stride */
485         __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */
486         __le64  s_mmp_block;            /* Block for multi-mount protection */
487         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
488         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
489         __u8    s_reserved_char_pad2;
490         __le16  s_reserved_pad;
491         __u32   s_reserved[162];        /* Padding to the end of the block */
492 };
493 
494 /* data type for block offset of block group */
495 typedef int ext3_grpblk_t;
496 
497 /* data type for filesystem-wide blocks number */
498 typedef unsigned long ext3_fsblk_t;
499 
500 #define E3FSBLK "%lu"
501 
502 struct ext3_reserve_window {
503         ext3_fsblk_t    _rsv_start;     /* First byte reserved */
504         ext3_fsblk_t    _rsv_end;       /* Last byte reserved or 0 */
505 };
506 
507 struct ext3_reserve_window_node {
508         struct rb_node          rsv_node;
509         __u32                   rsv_goal_size;
510         __u32                   rsv_alloc_hit;
511         struct ext3_reserve_window      rsv_window;
512 };
513 
514 struct ext3_block_alloc_info {
515         /* information about reservation window */
516         struct ext3_reserve_window_node rsv_window_node;
517         /*
518          * was i_next_alloc_block in ext3_inode_info
519          * is the logical (file-relative) number of the
520          * most-recently-allocated block in this file.
521          * We use this for detecting linearly ascending allocation requests.
522          */
523         __u32                   last_alloc_logical_block;
524         /*
525          * Was i_next_alloc_goal in ext3_inode_info
526          * is the *physical* companion to i_next_alloc_block.
527          * it the physical block number of the block which was most-recentl
528          * allocated to this file.  This give us the goal (target) for the next
529          * allocation when we detect linearly ascending requests.
530          */
531         ext3_fsblk_t            last_alloc_physical_block;
532 };
533 
534 #define rsv_start rsv_window._rsv_start
535 #define rsv_end rsv_window._rsv_end
536 
537 /*
538  * third extended file system inode data in memory
539  */
540 struct ext3_inode_info {
541         __le32  i_data[15];     /* unconverted */
542         __u32   i_flags;
543 #ifdef EXT3_FRAGMENTS
544         __u32   i_faddr;
545         __u8    i_frag_no;
546         __u8    i_frag_size;
547 #endif
548         ext3_fsblk_t    i_file_acl;
549         __u32   i_dir_acl;
550         __u32   i_dtime;
551 
552         /*
553          * i_block_group is the number of the block group which contains
554          * this file's inode.  Constant across the lifetime of the inode,
555          * it is ued for making block allocation decisions - we try to
556          * place a file's data blocks near its inode block, and new inodes
557          * near to their parent directory's inode.
558          */
559         __u32   i_block_group;
560         unsigned long   i_state_flags;  /* Dynamic state flags for ext3 */
561 
562         /* block reservation info */
563         struct ext3_block_alloc_info *i_block_alloc_info;
564 
565         __u32   i_dir_start_lookup;
566 #ifdef CONFIG_EXT3_FS_XATTR
567         /*
568          * Extended attributes can be read independently of the main file
569          * data. Taking i_mutex even when reading would cause contention
570          * between readers of EAs and writers of regular file data, so
571          * instead we synchronize on xattr_sem when reading or changing
572          * EAs.
573          */
574         struct rw_semaphore xattr_sem;
575 #endif
576 
577         struct list_head i_orphan;      /* unlinked but open inodes */
578 
579         /*
580          * i_disksize keeps track of what the inode size is ON DISK, not
581          * in memory.  During truncate, i_size is set to the new size by
582          * the VFS prior to calling ext3_truncate(), but the filesystem won't
583          * set i_disksize to 0 until the truncate is actually under way.
584          *
585          * The intent is that i_disksize always represents the blocks which
586          * are used by this file.  This allows recovery to restart truncate
587          * on orphans if we crash during truncate.  We actually write i_disksize
588          * into the on-disk inode when writing inodes out, instead of i_size.
589          *
590          * The only time when i_disksize and i_size may be different is when
591          * a truncate is in progress.  The only things which change i_disksize
592          * are ext3_get_block (growth) and ext3_truncate (shrinkth).
593          */
594         loff_t  i_disksize;
595 
596         /* on-disk additional length */
597         __u16 i_extra_isize;
598 
599         /*
600          * truncate_mutex is for serialising ext3_truncate() against
601          * ext3_getblock().  In the 2.4 ext2 design, great chunks of inode's
602          * data tree are chopped off during truncate. We can't do that in
603          * ext3 because whenever we perform intermediate commits during
604          * truncate, the inode and all the metadata blocks *must* be in a
605          * consistent state which allows truncation of the orphans to restart
606          * during recovery.  Hence we must fix the get_block-vs-truncate race
607          * by other means, so we have truncate_mutex.
608          */
609         struct mutex truncate_mutex;
610 
611         /*
612          * Transactions that contain inode's metadata needed to complete
613          * fsync and fdatasync, respectively.
614          */
615         atomic_t i_sync_tid;
616         atomic_t i_datasync_tid;
617 
618 #ifdef CONFIG_QUOTA
619         struct dquot *i_dquot[MAXQUOTAS];
620 #endif
621 
622         struct inode vfs_inode;
623 };
624 
625 /*
626  * third extended-fs super-block data in memory
627  */
628 struct ext3_sb_info {
629         unsigned long s_frag_size;      /* Size of a fragment in bytes */
630         unsigned long s_frags_per_block;/* Number of fragments per block */
631         unsigned long s_inodes_per_block;/* Number of inodes per block */
632         unsigned long s_frags_per_group;/* Number of fragments in a group */
633         unsigned long s_blocks_per_group;/* Number of blocks in a group */
634         unsigned long s_inodes_per_group;/* Number of inodes in a group */
635         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
636         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
637         unsigned long s_desc_per_block; /* Number of group descriptors per block */
638         unsigned long s_groups_count;   /* Number of groups in the fs */
639         unsigned long s_overhead_last;  /* Last calculated overhead */
640         unsigned long s_blocks_last;    /* Last seen block count */
641         struct buffer_head * s_sbh;     /* Buffer containing the super block */
642         struct ext3_super_block * s_es; /* Pointer to the super block in the buffer */
643         struct buffer_head ** s_group_desc;
644         unsigned long  s_mount_opt;
645         ext3_fsblk_t s_sb_block;
646         kuid_t s_resuid;
647         kgid_t s_resgid;
648         unsigned short s_mount_state;
649         unsigned short s_pad;
650         int s_addr_per_block_bits;
651         int s_desc_per_block_bits;
652         int s_inode_size;
653         int s_first_ino;
654         spinlock_t s_next_gen_lock;
655         u32 s_next_generation;
656         u32 s_hash_seed[4];
657         int s_def_hash_version;
658         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
659         struct percpu_counter s_freeblocks_counter;
660         struct percpu_counter s_freeinodes_counter;
661         struct percpu_counter s_dirs_counter;
662         struct blockgroup_lock *s_blockgroup_lock;
663 
664         /* root of the per fs reservation window tree */
665         spinlock_t s_rsv_window_lock;
666         struct rb_root s_rsv_window_root;
667         struct ext3_reserve_window_node s_rsv_window_head;
668 
669         /* Journaling */
670         struct inode * s_journal_inode;
671         struct journal_s * s_journal;
672         struct list_head s_orphan;
673         struct mutex s_orphan_lock;
674         struct mutex s_resize_lock;
675         unsigned long s_commit_interval;
676         struct block_device *journal_bdev;
677 #ifdef CONFIG_QUOTA
678         char *s_qf_names[EXT3_MAXQUOTAS];       /* Names of quota files with journalled quota */
679         int s_jquota_fmt;                       /* Format of quota to use */
680 #endif
681 };
682 
683 static inline spinlock_t *
684 sb_bgl_lock(struct ext3_sb_info *sbi, unsigned int block_group)
685 {
686         return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
687 }
688 
689 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
690 {
691         return sb->s_fs_info;
692 }
693 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
694 {
695         return container_of(inode, struct ext3_inode_info, vfs_inode);
696 }
697 
698 static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
699 {
700         return ino == EXT3_ROOT_INO ||
701                 ino == EXT3_JOURNAL_INO ||
702                 ino == EXT3_RESIZE_INO ||
703                 (ino >= EXT3_FIRST_INO(sb) &&
704                  ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
705 }
706 
707 /*
708  * Inode dynamic state flags
709  */
710 enum {
711         EXT3_STATE_JDATA,               /* journaled data exists */
712         EXT3_STATE_NEW,                 /* inode is newly created */
713         EXT3_STATE_XATTR,               /* has in-inode xattrs */
714         EXT3_STATE_FLUSH_ON_CLOSE,      /* flush dirty pages on close */
715 };
716 
717 static inline int ext3_test_inode_state(struct inode *inode, int bit)
718 {
719         return test_bit(bit, &EXT3_I(inode)->i_state_flags);
720 }
721 
722 static inline void ext3_set_inode_state(struct inode *inode, int bit)
723 {
724         set_bit(bit, &EXT3_I(inode)->i_state_flags);
725 }
726 
727 static inline void ext3_clear_inode_state(struct inode *inode, int bit)
728 {
729         clear_bit(bit, &EXT3_I(inode)->i_state_flags);
730 }
731 
732 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
733 
734 /*
735  * Codes for operating systems
736  */
737 #define EXT3_OS_LINUX           0
738 #define EXT3_OS_HURD            1
739 #define EXT3_OS_MASIX           2
740 #define EXT3_OS_FREEBSD         3
741 #define EXT3_OS_LITES           4
742 
743 /*
744  * Revision levels
745  */
746 #define EXT3_GOOD_OLD_REV       0       /* The good old (original) format */
747 #define EXT3_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
748 
749 #define EXT3_CURRENT_REV        EXT3_GOOD_OLD_REV
750 #define EXT3_MAX_SUPP_REV       EXT3_DYNAMIC_REV
751 
752 #define EXT3_GOOD_OLD_INODE_SIZE 128
753 
754 /*
755  * Feature set definitions
756  */
757 
758 #define EXT3_HAS_COMPAT_FEATURE(sb,mask)                        \
759         ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
760 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
761         ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
762 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask)                      \
763         ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
764 #define EXT3_SET_COMPAT_FEATURE(sb,mask)                        \
765         EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
766 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask)                     \
767         EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
768 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask)                      \
769         EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
770 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask)                      \
771         EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
772 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
773         EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
774 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
775         EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
776 
777 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC        0x0001
778 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES       0x0002
779 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
780 #define EXT3_FEATURE_COMPAT_EXT_ATTR            0x0008
781 #define EXT3_FEATURE_COMPAT_RESIZE_INODE        0x0010
782 #define EXT3_FEATURE_COMPAT_DIR_INDEX           0x0020
783 
784 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
785 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
786 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
787 
788 #define EXT3_FEATURE_INCOMPAT_COMPRESSION       0x0001
789 #define EXT3_FEATURE_INCOMPAT_FILETYPE          0x0002
790 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
791 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
792 #define EXT3_FEATURE_INCOMPAT_META_BG           0x0010
793 
794 #define EXT3_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
795 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT3_FEATURE_INCOMPAT_FILETYPE| \
796                                          EXT3_FEATURE_INCOMPAT_RECOVER| \
797                                          EXT3_FEATURE_INCOMPAT_META_BG)
798 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
799                                          EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
800                                          EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
801 
802 /*
803  * Default values for user and/or group using reserved blocks
804  */
805 #define EXT3_DEF_RESUID         0
806 #define EXT3_DEF_RESGID         0
807 
808 /*
809  * Default mount options
810  */
811 #define EXT3_DEFM_DEBUG         0x0001
812 #define EXT3_DEFM_BSDGROUPS     0x0002
813 #define EXT3_DEFM_XATTR_USER    0x0004
814 #define EXT3_DEFM_ACL           0x0008
815 #define EXT3_DEFM_UID16         0x0010
816 #define EXT3_DEFM_JMODE         0x0060
817 #define EXT3_DEFM_JMODE_DATA    0x0020
818 #define EXT3_DEFM_JMODE_ORDERED 0x0040
819 #define EXT3_DEFM_JMODE_WBACK   0x0060
820 
821 /*
822  * Structure of a directory entry
823  */
824 #define EXT3_NAME_LEN 255
825 
826 struct ext3_dir_entry {
827         __le32  inode;                  /* Inode number */
828         __le16  rec_len;                /* Directory entry length */
829         __le16  name_len;               /* Name length */
830         char    name[EXT3_NAME_LEN];    /* File name */
831 };
832 
833 /*
834  * The new version of the directory entry.  Since EXT3 structures are
835  * stored in intel byte order, and the name_len field could never be
836  * bigger than 255 chars, it's safe to reclaim the extra byte for the
837  * file_type field.
838  */
839 struct ext3_dir_entry_2 {
840         __le32  inode;                  /* Inode number */
841         __le16  rec_len;                /* Directory entry length */
842         __u8    name_len;               /* Name length */
843         __u8    file_type;
844         char    name[EXT3_NAME_LEN];    /* File name */
845 };
846 
847 /*
848  * Ext3 directory file types.  Only the low 3 bits are used.  The
849  * other bits are reserved for now.
850  */
851 #define EXT3_FT_UNKNOWN         0
852 #define EXT3_FT_REG_FILE        1
853 #define EXT3_FT_DIR             2
854 #define EXT3_FT_CHRDEV          3
855 #define EXT3_FT_BLKDEV          4
856 #define EXT3_FT_FIFO            5
857 #define EXT3_FT_SOCK            6
858 #define EXT3_FT_SYMLINK         7
859 
860 #define EXT3_FT_MAX             8
861 
862 /*
863  * EXT3_DIR_PAD defines the directory entries boundaries
864  *
865  * NOTE: It must be a multiple of 4
866  */
867 #define EXT3_DIR_PAD                    4
868 #define EXT3_DIR_ROUND                  (EXT3_DIR_PAD - 1)
869 #define EXT3_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT3_DIR_ROUND) & \
870                                          ~EXT3_DIR_ROUND)
871 #define EXT3_MAX_REC_LEN                ((1<<16)-1)
872 
873 /*
874  * Tests against MAX_REC_LEN etc were put in place for 64k block
875  * sizes; if that is not possible on this arch, we can skip
876  * those tests and speed things up.
877  */
878 static inline unsigned ext3_rec_len_from_disk(__le16 dlen)
879 {
880         unsigned len = le16_to_cpu(dlen);
881 
882 #if (PAGE_CACHE_SIZE >= 65536)
883         if (len == EXT3_MAX_REC_LEN)
884                 return 1 << 16;
885 #endif
886         return len;
887 }
888 
889 static inline __le16 ext3_rec_len_to_disk(unsigned len)
890 {
891 #if (PAGE_CACHE_SIZE >= 65536)
892         if (len == (1 << 16))
893                 return cpu_to_le16(EXT3_MAX_REC_LEN);
894         else if (len > (1 << 16))
895                 BUG();
896 #endif
897         return cpu_to_le16(len);
898 }
899 
900 /*
901  * Hash Tree Directory indexing
902  * (c) Daniel Phillips, 2001
903  */
904 
905 #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
906                                       EXT3_FEATURE_COMPAT_DIR_INDEX) && \
907                       (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
908 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
909 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
910 
911 /* Legal values for the dx_root hash_version field: */
912 
913 #define DX_HASH_LEGACY          0
914 #define DX_HASH_HALF_MD4        1
915 #define DX_HASH_TEA             2
916 #define DX_HASH_LEGACY_UNSIGNED 3
917 #define DX_HASH_HALF_MD4_UNSIGNED       4
918 #define DX_HASH_TEA_UNSIGNED            5
919 
920 /* hash info structure used by the directory hash */
921 struct dx_hash_info
922 {
923         u32             hash;
924         u32             minor_hash;
925         int             hash_version;
926         u32             *seed;
927 };
928 
929 
930 /* 32 and 64 bit signed EOF for dx directories */
931 #define EXT3_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
932 #define EXT3_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
933 
934 
935 /*
936  * Control parameters used by ext3_htree_next_block
937  */
938 #define HASH_NB_ALWAYS          1
939 
940 
941 /*
942  * Describe an inode's exact location on disk and in memory
943  */
944 struct ext3_iloc
945 {
946         struct buffer_head *bh;
947         unsigned long offset;
948         unsigned long block_group;
949 };
950 
951 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
952 {
953         return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
954 }
955 
956 /*
957  * This structure is stuffed into the struct file's private_data field
958  * for directories.  It is where we put information so that we can do
959  * readdir operations in hash tree order.
960  */
961 struct dir_private_info {
962         struct rb_root  root;
963         struct rb_node  *curr_node;
964         struct fname    *extra_fname;
965         loff_t          last_pos;
966         __u32           curr_hash;
967         __u32           curr_minor_hash;
968         __u32           next_hash;
969 };
970 
971 /* calculate the first block number of the group */
972 static inline ext3_fsblk_t
973 ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
974 {
975         return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
976                 le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
977 }
978 
979 /*
980  * Special error return code only used by dx_probe() and its callers.
981  */
982 #define ERR_BAD_DX_DIR  -75000
983 
984 /*
985  * Function prototypes
986  */
987 
988 /*
989  * Ok, these declarations are also in <linux/kernel.h> but none of the
990  * ext3 source programs needs to include it so they are duplicated here.
991  */
992 # define NORET_TYPE    /**/
993 # define ATTRIB_NORET  __attribute__((noreturn))
994 # define NORET_AND     noreturn,
995 
996 /* balloc.c */
997 extern int ext3_bg_has_super(struct super_block *sb, int group);
998 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
999 extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
1000                         ext3_fsblk_t goal, int *errp);
1001 extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
1002                         ext3_fsblk_t goal, unsigned long *count, int *errp);
1003 extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
1004                         ext3_fsblk_t block, unsigned long count);
1005 extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
1006                                  ext3_fsblk_t block, unsigned long count,
1007                                 unsigned long *pdquot_freed_blocks);
1008 extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
1009 extern void ext3_check_blocks_bitmap (struct super_block *);
1010 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
1011                                                     unsigned int block_group,
1012                                                     struct buffer_head ** bh);
1013 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
1014 extern void ext3_init_block_alloc_info(struct inode *);
1015 extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
1016 extern int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range);
1017 
1018 /* dir.c */
1019 extern int ext3_check_dir_entry(const char *, struct inode *,
1020                                 struct ext3_dir_entry_2 *,
1021                                 struct buffer_head *, unsigned long);
1022 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
1023                                     __u32 minor_hash,
1024                                     struct ext3_dir_entry_2 *dirent);
1025 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
1026 
1027 /* fsync.c */
1028 extern int ext3_sync_file(struct file *, loff_t, loff_t, int);
1029 
1030 /* hash.c */
1031 extern int ext3fs_dirhash(const char *name, int len, struct
1032                           dx_hash_info *hinfo);
1033 
1034 /* ialloc.c */
1035 extern struct inode * ext3_new_inode (handle_t *, struct inode *,
1036                                       const struct qstr *, umode_t);
1037 extern void ext3_free_inode (handle_t *, struct inode *);
1038 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
1039 extern unsigned long ext3_count_free_inodes (struct super_block *);
1040 extern unsigned long ext3_count_dirs (struct super_block *);
1041 extern void ext3_check_inodes_bitmap (struct super_block *);
1042 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
1043 
1044 
1045 /* inode.c */
1046 int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
1047                 struct buffer_head *bh, ext3_fsblk_t blocknr);
1048 struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
1049 struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
1050 int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
1051         sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
1052         int create);
1053 
1054 extern struct inode *ext3_iget(struct super_block *, unsigned long);
1055 extern int  ext3_write_inode (struct inode *, struct writeback_control *);
1056 extern int  ext3_setattr (struct dentry *, struct iattr *);
1057 extern void ext3_evict_inode (struct inode *);
1058 extern int  ext3_sync_inode (handle_t *, struct inode *);
1059 extern void ext3_discard_reservation (struct inode *);
1060 extern void ext3_dirty_inode(struct inode *, int);
1061 extern int ext3_change_inode_journal_flag(struct inode *, int);
1062 extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
1063 extern int ext3_can_truncate(struct inode *inode);
1064 extern void ext3_truncate(struct inode *inode);
1065 extern void ext3_set_inode_flags(struct inode *);
1066 extern void ext3_get_inode_flags(struct ext3_inode_info *);
1067 extern void ext3_set_aops(struct inode *inode);
1068 extern int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1069                        u64 start, u64 len);
1070 
1071 /* ioctl.c */
1072 extern long ext3_ioctl(struct file *, unsigned int, unsigned long);
1073 extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long);
1074 
1075 /* namei.c */
1076 extern int ext3_orphan_add(handle_t *, struct inode *);
1077 extern int ext3_orphan_del(handle_t *, struct inode *);
1078 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1079                                 __u32 start_minor_hash, __u32 *next_hash);
1080 
1081 /* resize.c */
1082 extern int ext3_group_add(struct super_block *sb,
1083                                 struct ext3_new_group_data *input);
1084 extern int ext3_group_extend(struct super_block *sb,
1085                                 struct ext3_super_block *es,
1086                                 ext3_fsblk_t n_blocks_count);
1087 
1088 /* super.c */
1089 extern __printf(3, 4)
1090 void ext3_error(struct super_block *, const char *, const char *, ...);
1091 extern void __ext3_std_error (struct super_block *, const char *, int);
1092 extern __printf(3, 4)
1093 void ext3_abort(struct super_block *, const char *, const char *, ...);
1094 extern __printf(3, 4)
1095 void ext3_warning(struct super_block *, const char *, const char *, ...);
1096 extern __printf(3, 4)
1097 void ext3_msg(struct super_block *, const char *, const char *, ...);
1098 extern void ext3_update_dynamic_rev (struct super_block *sb);
1099 
1100 #define ext3_std_error(sb, errno)                               \
1101 do {                                                            \
1102         if ((errno))                                            \
1103                 __ext3_std_error((sb), __func__, (errno));      \
1104 } while (0)
1105 
1106 /*
1107  * Inodes and files operations
1108  */
1109 
1110 /* dir.c */
1111 extern const struct file_operations ext3_dir_operations;
1112 
1113 /* file.c */
1114 extern const struct inode_operations ext3_file_inode_operations;
1115 extern const struct file_operations ext3_file_operations;
1116 
1117 /* namei.c */
1118 extern const struct inode_operations ext3_dir_inode_operations;
1119 extern const struct inode_operations ext3_special_inode_operations;
1120 
1121 /* symlink.c */
1122 extern const struct inode_operations ext3_symlink_inode_operations;
1123 extern const struct inode_operations ext3_fast_symlink_inode_operations;
1124 
1125 #define EXT3_JOURNAL(inode)     (EXT3_SB((inode)->i_sb)->s_journal)
1126 
1127 /* Define the number of blocks we need to account to a transaction to
1128  * modify one block of data.
1129  *
1130  * We may have to touch one inode, one bitmap buffer, up to three
1131  * indirection blocks, the group and superblock summaries, and the data
1132  * block to complete the transaction.  */
1133 
1134 #define EXT3_SINGLEDATA_TRANS_BLOCKS    8U
1135 
1136 /* Extended attribute operations touch at most two data buffers,
1137  * two bitmap buffers, and two group summaries, in addition to the inode
1138  * and the superblock, which are already accounted for. */
1139 
1140 #define EXT3_XATTR_TRANS_BLOCKS         6U
1141 
1142 /* Define the minimum size for a transaction which modifies data.  This
1143  * needs to take into account the fact that we may end up modifying two
1144  * quota files too (one for the group, one for the user quota).  The
1145  * superblock only gets updated once, of course, so don't bother
1146  * counting that again for the quota updates. */
1147 
1148 #define EXT3_DATA_TRANS_BLOCKS(sb)      (EXT3_SINGLEDATA_TRANS_BLOCKS + \
1149                                          EXT3_XATTR_TRANS_BLOCKS - 2 + \
1150                                          EXT3_MAXQUOTAS_TRANS_BLOCKS(sb))
1151 
1152 /* Delete operations potentially hit one directory's namespace plus an
1153  * entire inode, plus arbitrary amounts of bitmap/indirection data.  Be
1154  * generous.  We can grow the delete transaction later if necessary. */
1155 
1156 #define EXT3_DELETE_TRANS_BLOCKS(sb)   (EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) + 64)
1157 
1158 /* Define an arbitrary limit for the amount of data we will anticipate
1159  * writing to any given transaction.  For unbounded transactions such as
1160  * write(2) and truncate(2) we can write more than this, but we always
1161  * start off at the maximum transaction size and grow the transaction
1162  * optimistically as we go. */
1163 
1164 #define EXT3_MAX_TRANS_DATA             64U
1165 
1166 /* We break up a large truncate or write transaction once the handle's
1167  * buffer credits gets this low, we need either to extend the
1168  * transaction or to start a new one.  Reserve enough space here for
1169  * inode, bitmap, superblock, group and indirection updates for at least
1170  * one block, plus two quota updates.  Quota allocations are not
1171  * needed. */
1172 
1173 #define EXT3_RESERVE_TRANS_BLOCKS       12U
1174 
1175 #define EXT3_INDEX_EXTRA_TRANS_BLOCKS   8
1176 
1177 #ifdef CONFIG_QUOTA
1178 /* Amount of blocks needed for quota update - we know that the structure was
1179  * allocated so we need to update only inode+data */
1180 #define EXT3_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
1181 /* Amount of blocks needed for quota insert/delete - we do some block writes
1182  * but inode, sb and group updates are done only once */
1183 #define EXT3_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
1184                 (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0)
1185 #define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
1186                 (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0)
1187 #else
1188 #define EXT3_QUOTA_TRANS_BLOCKS(sb) 0
1189 #define EXT3_QUOTA_INIT_BLOCKS(sb) 0
1190 #define EXT3_QUOTA_DEL_BLOCKS(sb) 0
1191 #endif
1192 #define EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) (EXT3_MAXQUOTAS*EXT3_QUOTA_TRANS_BLOCKS(sb))
1193 #define EXT3_MAXQUOTAS_INIT_BLOCKS(sb) (EXT3_MAXQUOTAS*EXT3_QUOTA_INIT_BLOCKS(sb))
1194 #define EXT3_MAXQUOTAS_DEL_BLOCKS(sb) (EXT3_MAXQUOTAS*EXT3_QUOTA_DEL_BLOCKS(sb))
1195 
1196 int
1197 ext3_mark_iloc_dirty(handle_t *handle,
1198                      struct inode *inode,
1199                      struct ext3_iloc *iloc);
1200 
1201 /*
1202  * On success, We end up with an outstanding reference count against
1203  * iloc->bh.  This _must_ be cleaned up later.
1204  */
1205 
1206 int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
1207                         struct ext3_iloc *iloc);
1208 
1209 int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);
1210 
1211 /*
1212  * Wrapper functions with which ext3 calls into JBD.  The intent here is
1213  * to allow these to be turned into appropriate stubs so ext3 can control
1214  * ext2 filesystems, so ext2+ext3 systems only nee one fs.  This work hasn't
1215  * been done yet.
1216  */
1217 
1218 static inline void ext3_journal_release_buffer(handle_t *handle,
1219                                                 struct buffer_head *bh)
1220 {
1221         journal_release_buffer(handle, bh);
1222 }
1223 
1224 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
1225                 struct buffer_head *bh, handle_t *handle, int err);
1226 
1227 int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
1228                                 struct buffer_head *bh);
1229 
1230 int __ext3_journal_get_write_access(const char *where, handle_t *handle,
1231                                 struct buffer_head *bh);
1232 
1233 int __ext3_journal_forget(const char *where, handle_t *handle,
1234                                 struct buffer_head *bh);
1235 
1236 int __ext3_journal_revoke(const char *where, handle_t *handle,
1237                                 unsigned long blocknr, struct buffer_head *bh);
1238 
1239 int __ext3_journal_get_create_access(const char *where,
1240                                 handle_t *handle, struct buffer_head *bh);
1241 
1242 int __ext3_journal_dirty_metadata(const char *where,
1243                                 handle_t *handle, struct buffer_head *bh);
1244 
1245 #define ext3_journal_get_undo_access(handle, bh) \
1246         __ext3_journal_get_undo_access(__func__, (handle), (bh))
1247 #define ext3_journal_get_write_access(handle, bh) \
1248         __ext3_journal_get_write_access(__func__, (handle), (bh))
1249 #define ext3_journal_revoke(handle, blocknr, bh) \
1250         __ext3_journal_revoke(__func__, (handle), (blocknr), (bh))
1251 #define ext3_journal_get_create_access(handle, bh) \
1252         __ext3_journal_get_create_access(__func__, (handle), (bh))
1253 #define ext3_journal_dirty_metadata(handle, bh) \
1254         __ext3_journal_dirty_metadata(__func__, (handle), (bh))
1255 #define ext3_journal_forget(handle, bh) \
1256         __ext3_journal_forget(__func__, (handle), (bh))
1257 
1258 int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
1259 
1260 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
1261 int __ext3_journal_stop(const char *where, handle_t *handle);
1262 
1263 static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
1264 {
1265         return ext3_journal_start_sb(inode->i_sb, nblocks);
1266 }
1267 
1268 #define ext3_journal_stop(handle) \
1269         __ext3_journal_stop(__func__, (handle))
1270 
1271 static inline handle_t *ext3_journal_current_handle(void)
1272 {
1273         return journal_current_handle();
1274 }
1275 
1276 static inline int ext3_journal_extend(handle_t *handle, int nblocks)
1277 {
1278         return journal_extend(handle, nblocks);
1279 }
1280 
1281 static inline int ext3_journal_restart(handle_t *handle, int nblocks)
1282 {
1283         return journal_restart(handle, nblocks);
1284 }
1285 
1286 static inline int ext3_journal_blocks_per_page(struct inode *inode)
1287 {
1288         return journal_blocks_per_page(inode);
1289 }
1290 
1291 static inline int ext3_journal_force_commit(journal_t *journal)
1292 {
1293         return journal_force_commit(journal);
1294 }
1295 
1296 /* super.c */
1297 int ext3_force_commit(struct super_block *sb);
1298 
1299 static inline int ext3_should_journal_data(struct inode *inode)
1300 {
1301         if (!S_ISREG(inode->i_mode))
1302                 return 1;
1303         if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
1304                 return 1;
1305         if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
1306                 return 1;
1307         return 0;
1308 }
1309 
1310 static inline int ext3_should_order_data(struct inode *inode)
1311 {
1312         if (!S_ISREG(inode->i_mode))
1313                 return 0;
1314         if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
1315                 return 0;
1316         if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
1317                 return 1;
1318         return 0;
1319 }
1320 
1321 static inline int ext3_should_writeback_data(struct inode *inode)
1322 {
1323         if (!S_ISREG(inode->i_mode))
1324                 return 0;
1325         if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
1326                 return 0;
1327         if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
1328                 return 1;
1329         return 0;
1330 }
1331 
1332 #include <trace/events/ext3.h>
1333 

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