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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 
241 /*
242  *  Mount options
243  */
244 struct 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  */
258 struct 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  */
404 struct 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 */
493 typedef int ext3_grpblk_t;
494 
495 /* data type for filesystem-wide blocks number */
496 typedef unsigned long ext3_fsblk_t;
497 
498 #define E3FSBLK "%lu"
499 
500 struct 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 
505 struct 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 
512 struct 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  */
538 struct 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  */
622 struct 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 
677 static inline spinlock_t *
678 sb_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 
683 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
684 {
685         return sb->s_fs_info;
686 }
687 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
688 {
689         return container_of(inode, struct ext3_inode_info, vfs_inode);
690 }
691 
692 static 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  */
704 enum {
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 
711 static 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 
716 static inline void ext3_set_inode_state(struct inode *inode, int bit)
717 {
718         set_bit(bit, &EXT3_I(inode)->i_state_flags);
719 }
720 
721 static 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 
820 struct 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  */
833 struct 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  */
872 static 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 
883 static 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 */
915 struct 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  */
938 struct ext3_iloc
939 {
940         struct buffer_head *bh;
941         unsigned long offset;
942         unsigned long block_group;
943 };
944 
945 static 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  */
955 struct 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 */
966 static inline ext3_fsblk_t
967 ext3_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 */
991 extern int ext3_bg_has_super(struct super_block *sb, int group);
992 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
993 extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
994                         ext3_fsblk_t goal, int *errp);
995 extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
996                         ext3_fsblk_t goal, unsigned long *count, int *errp);
997 extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
998                         ext3_fsblk_t block, unsigned long count);
999 extern 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);
1002 extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
1003 extern void ext3_check_blocks_bitmap (struct super_block *);
1004 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
1005                                                     unsigned int block_group,
1006                                                     struct buffer_head ** bh);
1007 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
1008 extern void ext3_init_block_alloc_info(struct inode *);
1009 extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
1010 extern int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range);
1011 
1012 /* dir.c */
1013 extern int ext3_check_dir_entry(const char *, struct inode *,
1014                                 struct ext3_dir_entry_2 *,
1015                                 struct buffer_head *, unsigned long);
1016 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
1017                                     __u32 minor_hash,
1018                                     struct ext3_dir_entry_2 *dirent);
1019 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
1020 
1021 /* fsync.c */
1022 extern int ext3_sync_file(struct file *, loff_t, loff_t, int);
1023 
1024 /* hash.c */
1025 extern int ext3fs_dirhash(const char *name, int len, struct
1026                           dx_hash_info *hinfo);
1027 
1028 /* ialloc.c */
1029 extern struct inode * ext3_new_inode (handle_t *, struct inode *,
1030                                       const struct qstr *, umode_t);
1031 extern void ext3_free_inode (handle_t *, struct inode *);
1032 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
1033 extern unsigned long ext3_count_free_inodes (struct super_block *);
1034 extern unsigned long ext3_count_dirs (struct super_block *);
1035 extern void ext3_check_inodes_bitmap (struct super_block *);
1036 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
1037 
1038 
1039 /* inode.c */
1040 int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
1041                 struct buffer_head *bh, ext3_fsblk_t blocknr);
1042 struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
1043 struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
1044 int 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 
1048 extern struct inode *ext3_iget(struct super_block *, unsigned long);
1049 extern int  ext3_write_inode (struct inode *, struct writeback_control *);
1050 extern int  ext3_setattr (struct dentry *, struct iattr *);
1051 extern void ext3_evict_inode (struct inode *);
1052 extern int  ext3_sync_inode (handle_t *, struct inode *);
1053 extern void ext3_discard_reservation (struct inode *);
1054 extern void ext3_dirty_inode(struct inode *, int);
1055 extern int ext3_change_inode_journal_flag(struct inode *, int);
1056 extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
1057 extern int ext3_can_truncate(struct inode *inode);
1058 extern void ext3_truncate(struct inode *inode);
1059 extern void ext3_set_inode_flags(struct inode *);
1060 extern void ext3_get_inode_flags(struct ext3_inode_info *);
1061 extern void ext3_set_aops(struct inode *inode);
1062 extern int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1063                        u64 start, u64 len);
1064 
1065 /* ioctl.c */
1066 extern long ext3_ioctl(struct file *, unsigned int, unsigned long);
1067 extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long);
1068 
1069 /* namei.c */
1070 extern int ext3_orphan_add(handle_t *, struct inode *);
1071 extern int ext3_orphan_del(handle_t *, struct inode *);
1072 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1073                                 __u32 start_minor_hash, __u32 *next_hash);
1074 
1075 /* resize.c */
1076 extern int ext3_group_add(struct super_block *sb,
1077                                 struct ext3_new_group_data *input);
1078 extern 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 */
1083 extern __printf(3, 4)
1084 void ext3_error(struct super_block *, const char *, const char *, ...);
1085 extern void __ext3_std_error (struct super_block *, const char *, int);
1086 extern __printf(3, 4)
1087 void ext3_abort(struct super_block *, const char *, const char *, ...);
1088 extern __printf(3, 4)
1089 void ext3_warning(struct super_block *, const char *, const char *, ...);
1090 extern __printf(3, 4)
1091 void ext3_msg(struct super_block *, const char *, const char *, ...);
1092 extern void ext3_update_dynamic_rev (struct super_block *sb);
1093 
1094 #define ext3_std_error(sb, errno)                               \
1095 do {                                                            \
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 */
1105 extern const struct file_operations ext3_dir_operations;
1106 
1107 /* file.c */
1108 extern const struct inode_operations ext3_file_inode_operations;
1109 extern const struct file_operations ext3_file_operations;
1110 
1111 /* namei.c */
1112 extern const struct inode_operations ext3_dir_inode_operations;
1113 extern const struct inode_operations ext3_special_inode_operations;
1114 
1115 /* symlink.c */
1116 extern const struct inode_operations ext3_symlink_inode_operations;
1117 extern 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 
1190 int
1191 ext3_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 
1200 int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
1201                         struct ext3_iloc *iloc);
1202 
1203 int 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 
1212 static inline void ext3_journal_release_buffer(handle_t *handle,
1213                                                 struct buffer_head *bh)
1214 {
1215         journal_release_buffer(handle, bh);
1216 }
1217 
1218 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
1219                 struct buffer_head *bh, handle_t *handle, int err);
1220 
1221 int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
1222                                 struct buffer_head *bh);
1223 
1224 int __ext3_journal_get_write_access(const char *where, handle_t *handle,
1225                                 struct buffer_head *bh);
1226 
1227 int __ext3_journal_forget(const char *where, handle_t *handle,
1228                                 struct buffer_head *bh);
1229 
1230 int __ext3_journal_revoke(const char *where, handle_t *handle,
1231                                 unsigned long blocknr, struct buffer_head *bh);
1232 
1233 int __ext3_journal_get_create_access(const char *where,
1234                                 handle_t *handle, struct buffer_head *bh);
1235 
1236 int __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 
1252 int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
1253 
1254 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
1255 int __ext3_journal_stop(const char *where, handle_t *handle);
1256 
1257 static 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 
1265 static inline handle_t *ext3_journal_current_handle(void)
1266 {
1267         return journal_current_handle();
1268 }
1269 
1270 static inline int ext3_journal_extend(handle_t *handle, int nblocks)
1271 {
1272         return journal_extend(handle, nblocks);
1273 }
1274 
1275 static inline int ext3_journal_restart(handle_t *handle, int nblocks)
1276 {
1277         return journal_restart(handle, nblocks);
1278 }
1279 
1280 static inline int ext3_journal_blocks_per_page(struct inode *inode)
1281 {
1282         return journal_blocks_per_page(inode);
1283 }
1284 
1285 static inline int ext3_journal_force_commit(journal_t *journal)
1286 {
1287         return journal_force_commit(journal);
1288 }
1289 
1290 /* super.c */
1291 int ext3_force_commit(struct super_block *sb);
1292 
1293 static 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 
1304 static 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 
1315 static 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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