blob: 0ab26fbf33808c565ae9ef4449d6836e4cb01fae [file] [log] [blame]
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002 * ext4.h
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040016#ifndef _EXT4_H
17#define _EXT4_H
Dave Kleikampac27a0e2006-10-11 01:20:50 -070018
19#include <linux/types.h>
Mingming Cao3a5b2ec2006-10-11 01:21:05 -070020#include <linux/blkdev.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070021#include <linux/magic.h>
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -050022#include <linux/jbd2.h>
Mingming Cao60e58e02009-01-22 18:13:05 +010023#include <linux/quota.h>
Theodore Ts'od444c3c2009-05-01 13:44:33 -040024#include <linux/rwsem.h>
25#include <linux/rbtree.h>
26#include <linux/seqlock.h>
27#include <linux/mutex.h>
Theodore Ts'oca0faba2009-05-03 16:33:44 -040028#include <linux/timer.h>
29#include <linux/wait.h>
30#include <linux/blockgroup_lock.h>
31#include <linux/percpu_counter.h>
Darrick J. Wong04419842012-04-29 18:27:10 -040032#include <crypto/hash.h>
Ben Hutchings4d92dc02010-05-17 06:00:00 -040033#ifdef __KERNEL__
34#include <linux/compat.h>
35#endif
Alex Tomasc9de5602008-01-29 00:19:52 -050036
Dave Kleikampac27a0e2006-10-11 01:20:50 -070037/*
Shen Feng8a356942008-07-11 19:27:31 -040038 * The fourth extended filesystem constants/structures
Dave Kleikampac27a0e2006-10-11 01:20:50 -070039 */
40
41/*
Mingming Cao617ba132006-10-11 01:20:53 -070042 * Define EXT4FS_DEBUG to produce debug messages
Dave Kleikampac27a0e2006-10-11 01:20:50 -070043 */
Mingming Cao617ba132006-10-11 01:20:53 -070044#undef EXT4FS_DEBUG
Dave Kleikampac27a0e2006-10-11 01:20:50 -070045
46/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -070047 * Debug code
48 */
Mingming Cao617ba132006-10-11 01:20:53 -070049#ifdef EXT4FS_DEBUG
50#define ext4_debug(f, a...) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070051 do { \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040052 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -040053 __FILE__, __LINE__, __func__); \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040054 printk(KERN_DEBUG f, ## a); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070055 } while (0)
56#else
Joe Perchesace36ad2012-03-19 23:11:43 -040057#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070058#endif
59
Theodore Ts'o4a092d72012-11-28 13:03:30 -050060/*
61 * Turn on EXT_DEBUG to get lots of info about extents operations.
62 */
63#define EXT_DEBUG__
64#ifdef EXT_DEBUG
65#define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
66#else
67#define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
68#endif
69
Frank Mayhar273df552010-03-02 11:46:09 -050070#define EXT4_ERROR_INODE(inode, fmt, a...) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -040071 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
72
73#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
74 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
Frank Mayhar273df552010-03-02 11:46:09 -050075
Theodore Ts'of7c21172011-01-10 12:10:55 -050076#define EXT4_ERROR_FILE(file, block, fmt, a...) \
77 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
Frank Mayhar273df552010-03-02 11:46:09 -050078
Theodore Ts'od444c3c2009-05-01 13:44:33 -040079/* data type for block offset of block group */
80typedef int ext4_grpblk_t;
81
82/* data type for filesystem-wide blocks number */
83typedef unsigned long long ext4_fsblk_t;
84
85/* data type for file logical block number */
86typedef __u32 ext4_lblk_t;
87
88/* data type for block group number */
89typedef unsigned int ext4_group_t;
90
Theodore Ts'o296c3552009-09-30 00:32:42 -040091/*
Theodore Ts'o60e66792010-05-17 07:00:00 -040092 * Flags used in mballoc's allocation_context flags field.
Theodore Ts'o296c3552009-09-30 00:32:42 -040093 *
94 * Also used to show what's going on for debugging purposes when the
95 * flag field is exported via the traceport interface
96 */
Theodore Ts'od444c3c2009-05-01 13:44:33 -040097
Alex Tomasc9de5602008-01-29 00:19:52 -050098/* prefer goal again. length */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040099#define EXT4_MB_HINT_MERGE 0x0001
Alex Tomasc9de5602008-01-29 00:19:52 -0500100/* blocks already reserved */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400101#define EXT4_MB_HINT_RESERVED 0x0002
Alex Tomasc9de5602008-01-29 00:19:52 -0500102/* metadata is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400103#define EXT4_MB_HINT_METADATA 0x0004
Alex Tomasc9de5602008-01-29 00:19:52 -0500104/* first blocks in the file */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400105#define EXT4_MB_HINT_FIRST 0x0008
Alex Tomasc9de5602008-01-29 00:19:52 -0500106/* search for the best chunk */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400107#define EXT4_MB_HINT_BEST 0x0010
Alex Tomasc9de5602008-01-29 00:19:52 -0500108/* data is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400109#define EXT4_MB_HINT_DATA 0x0020
Alex Tomasc9de5602008-01-29 00:19:52 -0500110/* don't preallocate (for tails) */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400111#define EXT4_MB_HINT_NOPREALLOC 0x0040
Alex Tomasc9de5602008-01-29 00:19:52 -0500112/* allocate for locality group */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400113#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
Alex Tomasc9de5602008-01-29 00:19:52 -0500114/* allocate goal blocks or none */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400115#define EXT4_MB_HINT_GOAL_ONLY 0x0100
Alex Tomasc9de5602008-01-29 00:19:52 -0500116/* goal is meaningful */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400117#define EXT4_MB_HINT_TRY_GOAL 0x0200
Mingming Caod2a17632008-07-14 17:52:37 -0400118/* blocks already pre-reserved by delayed allocation */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400119#define EXT4_MB_DELALLOC_RESERVED 0x0400
Theodore Ts'o4ba74d02009-08-09 22:01:13 -0400120/* We are doing stream allocation */
121#define EXT4_MB_STREAM_ALLOC 0x0800
Allison Henderson55f020d2011-05-25 07:41:26 -0400122/* Use reserved root blocks if needed */
123#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
Lukas Czerner27dd4382013-04-09 22:11:22 -0400124/* Use blocks from reserved pool */
125#define EXT4_MB_USE_RESERVED 0x2000
Alex Tomasc9de5602008-01-29 00:19:52 -0500126
127struct ext4_allocation_request {
128 /* target inode for block we're allocating */
129 struct inode *inode;
Alex Tomasc9de5602008-01-29 00:19:52 -0500130 /* how many blocks we want to allocate */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500131 unsigned int len;
Eric Sandeen726447d2009-07-13 10:24:17 -0400132 /* logical block in target inode */
133 ext4_lblk_t logical;
134 /* the closest logical allocated block to the left */
135 ext4_lblk_t lleft;
136 /* the closest logical allocated block to the right */
137 ext4_lblk_t lright;
138 /* phys. target (a hint) */
139 ext4_fsblk_t goal;
140 /* phys. block for the closest logical allocated block to the left */
141 ext4_fsblk_t pleft;
142 /* phys. block for the closest logical allocated block to the right */
143 ext4_fsblk_t pright;
Alex Tomasc9de5602008-01-29 00:19:52 -0500144 /* flags. see above EXT4_MB_HINT_* */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500145 unsigned int flags;
Alex Tomasc9de5602008-01-29 00:19:52 -0500146};
147
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700148/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400149 * Logical to physical block mapping, used by ext4_map_blocks()
150 *
151 * This structure is used to pass requests into ext4_map_blocks() as
152 * well as to store the information returned by ext4_map_blocks(). It
153 * takes less room on the stack than a struct buffer_head.
154 */
155#define EXT4_MAP_NEW (1 << BH_New)
156#define EXT4_MAP_MAPPED (1 << BH_Mapped)
157#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
158#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
159#define EXT4_MAP_UNINIT (1 << BH_Uninit)
Aditya Kali7b415bf2011-09-09 19:04:51 -0400160/* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
161 * ext4_map_blocks wants to know whether or not the underlying cluster has
162 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
163 * the requested mapping was from previously mapped (or delayed allocated)
164 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
165 * should never appear on buffer_head's state flags.
166 */
167#define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400168#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
169 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
Aditya Kali7b415bf2011-09-09 19:04:51 -0400170 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400171
172struct ext4_map_blocks {
173 ext4_fsblk_t m_pblk;
174 ext4_lblk_t m_lblk;
175 unsigned int m_len;
176 unsigned int m_flags;
177};
178
179/*
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400180 * Flags for ext4_io_end->flags
181 */
182#define EXT4_IO_END_UNWRITTEN 0x0001
Jan Karab0857d32013-06-04 14:23:41 -0400183#define EXT4_IO_END_DIRECT 0x0002
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400184
Curt Wohlgemuth41881882012-03-05 10:40:22 -0500185/*
Jan Kara6b523df2013-06-04 13:21:11 -0400186 * For converting uninitialized extents on a work queue. 'handle' is used for
187 * buffered writeback.
Curt Wohlgemuth41881882012-03-05 10:40:22 -0500188 */
Mingming Cao00314622009-09-28 15:49:08 -0400189typedef struct ext4_io_end {
jiayingz@google.com (Jiaying Zhang)5b3ff232010-07-27 11:56:06 -0400190 struct list_head list; /* per-file finished IO list */
Jan Kara6b523df2013-06-04 13:21:11 -0400191 handle_t *handle; /* handle reserved for extent
192 * conversion */
Mingming Cao00314622009-09-28 15:49:08 -0400193 struct inode *inode; /* file being written to */
Jan Karab0857d32013-06-04 14:23:41 -0400194 struct bio *bio; /* Linked list of completed
195 * bios covering the extent */
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400196 unsigned int flag; /* unwritten or not */
Eric Sandeena1de02d2010-02-04 23:58:38 -0500197 loff_t offset; /* offset in the file */
198 ssize_t size; /* size of the extent */
jiayingz@google.com (Jiaying Zhang)5b3ff232010-07-27 11:56:06 -0400199 struct kiocb *iocb; /* iocb struct for AIO */
200 int result; /* error value for AIO */
Jan Kara97a851e2013-06-04 11:58:58 -0400201 atomic_t count; /* reference counter */
Mingming Cao00314622009-09-28 15:49:08 -0400202} ext4_io_end_t;
203
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400204struct ext4_io_submit {
205 int io_op;
206 struct bio *io_bio;
207 ext4_io_end_t *io_end;
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400208 sector_t io_next_block;
209};
210
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400211/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700212 * Special inodes numbers
213 */
Mingming Cao617ba132006-10-11 01:20:53 -0700214#define EXT4_BAD_INO 1 /* Bad blocks inode */
215#define EXT4_ROOT_INO 2 /* Root inode */
Aditya Kaliae812302011-05-24 19:00:39 -0400216#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
217#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
Mingming Cao617ba132006-10-11 01:20:53 -0700218#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
219#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
220#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
221#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700222
Mingming Cao617ba132006-10-11 01:20:53 -0700223/* First non-reserved inode for old ext4 filesystems */
224#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700225
226/*
227 * Maximal count of links to a file
228 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400229#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700230
231/*
232 * Macro-instructions used to manage several block sizes
233 */
Mingming Cao617ba132006-10-11 01:20:53 -0700234#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -0500235#define EXT4_MAX_BLOCK_SIZE 65536
236#define EXT4_MIN_BLOCK_LOG_SIZE 10
Curt Wohlgemuthfb1813f2010-10-27 21:29:12 -0400237#define EXT4_MAX_BLOCK_LOG_SIZE 16
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700238#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700239# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700240#else
Mingming Cao617ba132006-10-11 01:20:53 -0700241# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700242#endif
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400243#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
Theodore Ts'o281b5992011-09-09 18:34:51 -0400244#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
245 EXT4_SB(s)->s_cluster_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700246#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700247# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Theodore Ts'o281b5992011-09-09 18:34:51 -0400248# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700249#else
Mingming Cao617ba132006-10-11 01:20:53 -0700250# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700251#endif
252#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700253#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
254#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
255#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700256#else
Mingming Cao617ba132006-10-11 01:20:53 -0700257#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
258 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700259 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -0700260#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
261 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700262 (s)->s_first_ino)
263#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400264#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700265
Theodore Ts'od5b8f312011-09-09 18:44:51 -0400266/* Translate a block number to a cluster number */
267#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
268/* Translate a cluster number to a block number */
269#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
270/* Translate # of blks to # of clusters */
271#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
272 (sbi)->s_cluster_bits)
273
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700274/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700275 * Structure of a blocks group descriptor
276 */
Mingming Cao617ba132006-10-11 01:20:53 -0700277struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700278{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400279 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400280 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
281 __le32 bg_inode_table_lo; /* Inodes table block */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500282 __le16 bg_free_blocks_count_lo;/* Free blocks count */
283 __le16 bg_free_inodes_count_lo;/* Free inodes count */
284 __le16 bg_used_dirs_count_lo; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400285 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
Darrick J. Wonge6153912012-04-29 18:23:10 -0400286 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
287 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
288 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500289 __le16 bg_itable_unused_lo; /* Unused inodes count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400290 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700291 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
292 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
293 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500294 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
295 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
296 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500297 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
Darrick J. Wonge6153912012-04-29 18:23:10 -0400298 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
299 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
300 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
301 __u32 bg_reserved;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700302};
303
Darrick J. Wong41a246d2012-04-29 18:33:10 -0400304#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
305 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
306 sizeof(__le16))
307#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
308 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
309 sizeof(__le16))
310
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400311/*
312 * Structure of a flex block group info
313 */
314
315struct flex_groups {
Theodore Ts'o90ba9832013-03-11 23:39:59 -0400316 atomic64_t free_clusters;
317 atomic_t free_inodes;
318 atomic_t used_dirs;
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400319};
320
Andreas Dilger717d50e2007-10-16 18:38:25 -0400321#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
322#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
323#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
324
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700325/*
326 * Macro-instructions used to manage group descriptors
327 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700328#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700329#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700330#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
331#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700332#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700333# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
Theodore Ts'o281b5992011-09-09 18:34:51 -0400334# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
Mingming Cao617ba132006-10-11 01:20:53 -0700335# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
336# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
337# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700338#else
Mingming Cao617ba132006-10-11 01:20:53 -0700339# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700340# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700341# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700342#endif
343
344/*
345 * Constants relative to the data blocks
346 */
Mingming Cao617ba132006-10-11 01:20:53 -0700347#define EXT4_NDIR_BLOCKS 12
348#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
349#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
350#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
351#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700352
353/*
354 * Inode flags
355 */
Mingming Cao617ba132006-10-11 01:20:53 -0700356#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
357#define EXT4_UNRM_FL 0x00000002 /* Undelete */
358#define EXT4_COMPR_FL 0x00000004 /* Compress file */
359#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
360#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
361#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
362#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
363#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700364/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700365#define EXT4_DIRTY_FL 0x00000100
366#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
367#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
368#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700369/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700370#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
371#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
372#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
373#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
374#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
375#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500376#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
Alex Tomasa86c6182006-10-11 01:21:03 -0700377#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Theodore Ts'of710b4b2010-01-25 03:31:32 -0500378#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500379#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
Tao Ma67cf5b02012-12-10 14:04:46 -0500380#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500381#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700382
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500383#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
Theodore Ts'o996bb9f2013-04-03 22:04:52 -0400384#define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700385
Duane Griffin8fa43a82009-02-15 18:57:26 -0500386/* Flags that should be inherited by new inodes from their parent. */
387#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
Theodore Ts'o1cd9f092011-08-31 11:54:51 -0400388 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
Duane Griffin8fa43a82009-02-15 18:57:26 -0500389 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
390 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
391
Duane Griffin2dc6b0d2009-02-15 18:09:20 -0500392/* Flags that are appropriate for regular files (all but dir-specific ones). */
393#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
394
395/* Flags that are appropriate for non-directories/regular files. */
396#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
397
398/* Mask out flags that are inappropriate for the given type of inode. */
399static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
400{
401 if (S_ISDIR(mode))
402 return flags;
403 else if (S_ISREG(mode))
404 return flags & EXT4_REG_FLMASK;
405 else
406 return flags & EXT4_OTHER_FLMASK;
407}
408
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400409/*
410 * Inode flags used for atomic set/get
411 */
412enum {
413 EXT4_INODE_SECRM = 0, /* Secure deletion */
414 EXT4_INODE_UNRM = 1, /* Undelete */
415 EXT4_INODE_COMPR = 2, /* Compress file */
416 EXT4_INODE_SYNC = 3, /* Synchronous updates */
417 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
418 EXT4_INODE_APPEND = 5, /* writes to file may only append */
419 EXT4_INODE_NODUMP = 6, /* do not dump file */
420 EXT4_INODE_NOATIME = 7, /* do not update atime */
421/* Reserved for compression usage... */
422 EXT4_INODE_DIRTY = 8,
423 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
424 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
425 EXT4_INODE_ECOMPR = 11, /* Compression error */
426/* End compression flags --- maybe not all used */
427 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
428 EXT4_INODE_IMAGIC = 13, /* AFS directory */
429 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
430 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
431 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
432 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
433 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
434 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
435 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
436 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
Tao Ma67cf5b02012-12-10 14:04:46 -0500437 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400438 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
439};
440
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400441/*
Carlos Maiolino9a4c8012012-12-10 16:30:45 -0500442 * Since it's pretty easy to mix up bit numbers and hex values, we use a
443 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
444 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
445 * any extra space in the compiled kernel image, otherwise, the build will fail.
446 * It's important that these values are the same, since we are using
447 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
448 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
449 * values found in ext2, ext3 and ext4 filesystems, and of course the values
450 * defined in e2fsprogs.
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400451 *
452 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
453 */
Carlos Maiolino9a4c8012012-12-10 16:30:45 -0500454#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
455#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
456
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400457static inline void ext4_check_flag_values(void)
458{
459 CHECK_FLAG_VALUE(SECRM);
460 CHECK_FLAG_VALUE(UNRM);
461 CHECK_FLAG_VALUE(COMPR);
462 CHECK_FLAG_VALUE(SYNC);
463 CHECK_FLAG_VALUE(IMMUTABLE);
464 CHECK_FLAG_VALUE(APPEND);
465 CHECK_FLAG_VALUE(NODUMP);
466 CHECK_FLAG_VALUE(NOATIME);
467 CHECK_FLAG_VALUE(DIRTY);
468 CHECK_FLAG_VALUE(COMPRBLK);
469 CHECK_FLAG_VALUE(NOCOMPR);
470 CHECK_FLAG_VALUE(ECOMPR);
471 CHECK_FLAG_VALUE(INDEX);
472 CHECK_FLAG_VALUE(IMAGIC);
473 CHECK_FLAG_VALUE(JOURNAL_DATA);
474 CHECK_FLAG_VALUE(NOTAIL);
475 CHECK_FLAG_VALUE(DIRSYNC);
476 CHECK_FLAG_VALUE(TOPDIR);
477 CHECK_FLAG_VALUE(HUGE_FILE);
478 CHECK_FLAG_VALUE(EXTENTS);
479 CHECK_FLAG_VALUE(EA_INODE);
480 CHECK_FLAG_VALUE(EOFBLOCKS);
Tao Ma67cf5b02012-12-10 14:04:46 -0500481 CHECK_FLAG_VALUE(INLINE_DATA);
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400482 CHECK_FLAG_VALUE(RESERVED);
483}
484
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700485/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700486struct ext4_new_group_input {
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400487 __u32 group; /* Group number for this data */
488 __u64 block_bitmap; /* Absolute block number of block bitmap */
489 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
490 __u64 inode_table; /* Absolute block number of inode table start */
491 __u32 blocks_count; /* Total number of blocks in this group */
492 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700493 __u16 unused;
494};
495
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400496#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
497struct compat_ext4_new_group_input {
498 u32 group;
499 compat_u64 block_bitmap;
500 compat_u64 inode_bitmap;
501 compat_u64 inode_table;
502 u32 blocks_count;
503 u16 reserved_blocks;
504 u16 unused;
505};
506#endif
507
Mingming Cao617ba132006-10-11 01:20:53 -0700508/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
509struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700510 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700511 __u64 block_bitmap;
512 __u64 inode_bitmap;
513 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700514 __u32 blocks_count;
515 __u16 reserved_blocks;
516 __u16 unused;
517 __u32 free_blocks_count;
518};
519
Yongqiang Yang33afdcc2012-01-03 23:32:52 -0500520/* Indexes used to index group tables in ext4_new_group_data */
521enum {
522 BLOCK_BITMAP = 0, /* block bitmap */
523 INODE_BITMAP, /* inode bitmap */
524 INODE_TABLE, /* inode tables */
525 GROUP_TABLE_COUNT,
526};
527
Amit Aroraa2df2a62007-07-17 21:42:41 -0400528/*
Eric Sandeen79e83032010-07-27 11:56:07 -0400529 * Flags used by ext4_map_blocks()
Amit Aroraa2df2a62007-07-17 21:42:41 -0400530 */
Theodore Ts'oc2177052009-05-14 00:58:52 -0400531 /* Allocate any needed blocks and/or convert an unitialized
532 extent to be an initialized ext4 */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400533#define EXT4_GET_BLOCKS_CREATE 0x0001
Theodore Ts'oc2177052009-05-14 00:58:52 -0400534 /* Request the creation of an unitialized extent */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400535#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
Theodore Ts'oc2177052009-05-14 00:58:52 -0400536#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
537 EXT4_GET_BLOCKS_CREATE)
Lukas Czerner27dd4382013-04-09 22:11:22 -0400538 /* Caller is from the delayed allocation writeout path
539 * finally doing the actual allocation of delayed blocks */
Jan Kara03f5d8b2009-06-09 00:17:05 -0400540#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
Mingming Cao00314622009-09-28 15:49:08 -0400541 /* caller is from the direct IO path, request to creation of an
542 unitialized extents if not allocated, split the uninitialized
543 extent if blocks has been preallocated already*/
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500544#define EXT4_GET_BLOCKS_PRE_IO 0x0008
Aneesh Kumar K.V1296cc82010-01-15 01:27:59 -0500545#define EXT4_GET_BLOCKS_CONVERT 0x0010
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500546#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
Mingming Cao00314622009-09-28 15:49:08 -0400547 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500548 /* Convert extent to initialized after IO complete */
549#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
Jiaying Zhang744692d2010-03-04 16:14:02 -0500550 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
Lukas Czerner27dd4382013-04-09 22:11:22 -0400551 /* Eventual metadata allocation (due to growing extent tree)
552 * should not fail, so try to use reserved blocks for that.*/
553#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
Vivek Haldar556b27a2011-05-25 07:41:54 -0400554 /* Don't normalize allocation size (used for fallocate) */
555#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
Dmitry Monakhova4e5d882011-10-25 08:15:12 -0400556 /* Request will not result in inode size update (user for fallocate) */
557#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
Zheng Liu729f52c2012-07-09 16:29:29 -0400558 /* Do not take i_data_sem locking in ext4_map_blocks */
559#define EXT4_GET_BLOCKS_NO_LOCK 0x0100
Zheng Liud100eef2013-02-18 00:29:59 -0500560 /* Do not put hole in extent cache */
561#define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700562
563/*
Theodore Ts'oe6362602009-11-23 07:17:05 -0500564 * Flags used by ext4_free_blocks
565 */
566#define EXT4_FREE_BLOCKS_METADATA 0x0001
567#define EXT4_FREE_BLOCKS_FORGET 0x0002
Theodore Ts'o1f2acb62010-01-22 17:40:42 -0500568#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
Maxim Patlasov7132de72011-07-10 19:37:48 -0400569#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
Theodore Ts'o84130192011-09-09 18:50:51 -0400570#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
571#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
Theodore Ts'oe6362602009-11-23 07:17:05 -0500572
573/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700574 * ioctl commands
575 */
Mingming Cao617ba132006-10-11 01:20:53 -0700576#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
577#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
578#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
579#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
Mingming Cao617ba132006-10-11 01:20:53 -0700580#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
581#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Mingming Cao617ba132006-10-11 01:20:53 -0700582#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
583#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400584#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
585#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
586#define EXT4_IOC_MIGRATE _IO('f', 9)
Theodore Ts'occd25062009-02-26 01:04:07 -0500587 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400588 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
Theodore Ts'occd25062009-02-26 01:04:07 -0500589#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
Akira Fujita748de672009-06-17 19:24:03 -0400590#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
Yongqiang Yang19c52462012-01-04 17:09:44 -0500591#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400592#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700593
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400594#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700595/*
596 * ioctl commands in 32 bit emulation
597 */
Mingming Cao617ba132006-10-11 01:20:53 -0700598#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
599#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
600#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
601#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
602#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
603#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
604#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400605#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
Mingming Cao617ba132006-10-11 01:20:53 -0700606#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
607#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400608#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700609
Uwe Kleine-Königb5950762010-11-01 15:38:34 -0400610/* Max physical block we can address w/o extents */
Eric Sandeenfb0a3872009-09-16 14:45:10 -0400611#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
612
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700613/*
614 * Structure of an inode on the disk
615 */
Mingming Cao617ba132006-10-11 01:20:53 -0700616struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700617 __le16 i_mode; /* File mode */
618 __le16 i_uid; /* Low 16 bits of Owner Uid */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500619 __le32 i_size_lo; /* Size in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700620 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400621 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700622 __le32 i_mtime; /* Modification time */
623 __le32 i_dtime; /* Deletion Time */
624 __le16 i_gid; /* Low 16 bits of Group Id */
625 __le16 i_links_count; /* Links count */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500626 __le32 i_blocks_lo; /* Blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700627 __le32 i_flags; /* File flags */
628 union {
629 struct {
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500630 __le32 l_i_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700631 } linux1;
632 struct {
633 __u32 h_i_translator;
634 } hurd1;
635 struct {
636 __u32 m_i_reserved1;
637 } masix1;
638 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700639 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700640 __le32 i_generation; /* File version (for NFS) */
Aneesh Kumar K.V7973c0c2008-01-28 23:58:27 -0500641 __le32 i_file_acl_lo; /* File ACL */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500642 __le32 i_size_high;
Coly Lif077d0d2007-10-16 18:38:25 -0400643 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700644 union {
645 struct {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500646 __le16 l_i_blocks_high; /* were l_i_reserved1 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700647 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400648 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700649 __le16 l_i_gid_high; /* were reserved2[0] */
Darrick J. Wonge6153912012-04-29 18:23:10 -0400650 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
651 __le16 l_i_reserved;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700652 } linux2;
653 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400654 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700655 __u16 h_i_mode_high;
656 __u16 h_i_uid_high;
657 __u16 h_i_gid_high;
658 __u32 h_i_author;
659 } hurd2;
660 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400661 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700662 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700663 __u32 m_i_reserved2[2];
664 } masix2;
665 } osd2; /* OS dependent 2 */
666 __le16 i_extra_isize;
Darrick J. Wonge6153912012-04-29 18:23:10 -0400667 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400668 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
669 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
670 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
671 __le32 i_crtime; /* File Creation time */
672 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500673 __le32 i_version_hi; /* high 32 bits for 64-bit version */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700674};
675
Akira Fujita748de672009-06-17 19:24:03 -0400676struct move_extent {
677 __u32 reserved; /* should be zero */
678 __u32 donor_fd; /* donor file descriptor */
679 __u64 orig_start; /* logical start offset in block for orig */
680 __u64 donor_start; /* logical start offset in block for donor */
681 __u64 len; /* block length to be moved */
682 __u64 moved_len; /* moved block length */
683};
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700684
Kalpak Shahef7f3832007-07-18 09:15:20 -0400685#define EXT4_EPOCH_BITS 2
686#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
687#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
688
689/*
690 * Extended fields will fit into an inode if the filesystem was formatted
691 * with large inodes (-I 256 or larger) and there are not currently any EAs
692 * consuming all of the available space. For new inodes we always reserve
693 * enough space for the kernel's known extended fields, but for inodes
694 * created with an old kernel this might not have been the case. None of
695 * the extended inode fields is critical for correct filesystem operation.
696 * This macro checks if a certain field fits in the inode. Note that
697 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
698 */
699#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
700 ((offsetof(typeof(*ext4_inode), field) + \
701 sizeof((ext4_inode)->field)) \
702 <= (EXT4_GOOD_OLD_INODE_SIZE + \
703 (einode)->i_extra_isize)) \
704
705static inline __le32 ext4_encode_extra_time(struct timespec *time)
706{
707 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400708 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
709 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
Kalpak Shahef7f3832007-07-18 09:15:20 -0400710}
711
712static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
713{
714 if (sizeof(time->tv_sec) > 4)
715 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
716 << 32;
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400717 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400718}
719
720#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
721do { \
722 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
723 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
724 (raw_inode)->xtime ## _extra = \
725 ext4_encode_extra_time(&(inode)->xtime); \
726} while (0)
727
728#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
729do { \
730 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
731 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
732 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
733 (raw_inode)->xtime ## _extra = \
734 ext4_encode_extra_time(&(einode)->xtime); \
735} while (0)
736
737#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
738do { \
739 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
740 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
741 ext4_decode_extra_time(&(inode)->xtime, \
742 raw_inode->xtime ## _extra); \
Eric Sandeenaf0b44a2010-12-19 22:10:31 -0500743 else \
744 (inode)->xtime.tv_nsec = 0; \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400745} while (0)
746
747#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
748do { \
749 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
750 (einode)->xtime.tv_sec = \
751 (signed)le32_to_cpu((raw_inode)->xtime); \
752 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
753 ext4_decode_extra_time(&(einode)->xtime, \
754 raw_inode->xtime ## _extra); \
Eric Sandeenaf0b44a2010-12-19 22:10:31 -0500755 else \
756 (einode)->xtime.tv_nsec = 0; \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400757} while (0)
758
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500759#define i_disk_version osd1.linux1.l_i_version
760
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700761#if defined(__KERNEL__) || defined(__linux__)
762#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700763#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500764#define i_blocks_high osd2.linux2.l_i_blocks_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700765#define i_uid_low i_uid
766#define i_gid_low i_gid
767#define i_uid_high osd2.linux2.l_i_uid_high
768#define i_gid_high osd2.linux2.l_i_gid_high
Darrick J. Wonge6153912012-04-29 18:23:10 -0400769#define i_checksum_lo osd2.linux2.l_i_checksum_lo
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700770
771#elif defined(__GNU__)
772
773#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700774#define i_uid_high osd2.hurd2.h_i_uid_high
775#define i_gid_high osd2.hurd2.h_i_gid_high
776#define i_author osd2.hurd2.h_i_author
777
778#elif defined(__masix__)
779
780#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700781#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700782#define i_reserved2 osd2.masix2.m_i_reserved2
783
784#endif /* defined(__KERNEL__) || defined(__linux__) */
785
Zheng Liuc0677e62012-11-08 15:18:54 -0500786#include "extents_status.h"
787
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400788/*
789 * fourth extended file system inode data in memory
790 */
791struct ext4_inode_info {
792 __le32 i_data[15]; /* unconverted */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400793 __u32 i_dtime;
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400794 ext4_fsblk_t i_file_acl;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400795
796 /*
797 * i_block_group is the number of the block group which contains
798 * this file's inode. Constant across the lifetime of the inode,
799 * it is ued for making block allocation decisions - we try to
800 * place a file's data blocks near its inode block, and new inodes
801 * near to their parent directory's inode.
802 */
803 ext4_group_t i_block_group;
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500804 ext4_lblk_t i_dir_start_lookup;
Theodore Ts'o353eb832011-01-10 12:18:25 -0500805#if (BITS_PER_LONG < 64)
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500806 unsigned long i_state_flags; /* Dynamic state flags */
Theodore Ts'o353eb832011-01-10 12:18:25 -0500807#endif
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400808 unsigned long i_flags;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400809
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400810 /*
811 * Extended attributes can be read independently of the main file
812 * data. Taking i_mutex even when reading would cause contention
813 * between readers of EAs and writers of regular file data, so
814 * instead we synchronize on xattr_sem when reading or changing
815 * EAs.
816 */
817 struct rw_semaphore xattr_sem;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400818
819 struct list_head i_orphan; /* unlinked but open inodes */
820
821 /*
822 * i_disksize keeps track of what the inode size is ON DISK, not
823 * in memory. During truncate, i_size is set to the new size by
824 * the VFS prior to calling ext4_truncate(), but the filesystem won't
825 * set i_disksize to 0 until the truncate is actually under way.
826 *
827 * The intent is that i_disksize always represents the blocks which
828 * are used by this file. This allows recovery to restart truncate
829 * on orphans if we crash during truncate. We actually write i_disksize
830 * into the on-disk inode when writing inodes out, instead of i_size.
831 *
832 * The only time when i_disksize and i_size may be different is when
833 * a truncate is in progress. The only things which change i_disksize
834 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
835 */
836 loff_t i_disksize;
837
838 /*
839 * i_data_sem is for serialising ext4_truncate() against
840 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
841 * data tree are chopped off during truncate. We can't do that in
842 * ext4 because whenever we perform intermediate commits during
843 * truncate, the inode and all the metadata blocks *must* be in a
844 * consistent state which allows truncation of the orphans to restart
845 * during recovery. Hence we must fix the get_block-vs-truncate race
846 * by other means, so we have i_data_sem.
847 */
848 struct rw_semaphore i_data_sem;
849 struct inode vfs_inode;
Theodore Ts'o8aefcd52011-01-10 12:29:43 -0500850 struct jbd2_inode *jinode;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400851
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400852 /*
853 * File creation time. Its function is same as that of
854 * struct timespec i_{a,c,m}time in the generic inode.
855 */
856 struct timespec i_crtime;
857
858 /* mballoc */
859 struct list_head i_prealloc_list;
860 spinlock_t i_prealloc_lock;
861
Zheng Liuc0677e62012-11-08 15:18:54 -0500862 /* extents status tree */
863 struct ext4_es_tree i_es_tree;
864 rwlock_t i_es_lock;
Zheng Liu74cd15c2013-02-18 00:32:55 -0500865 struct list_head i_es_lru;
866 unsigned int i_es_lru_nr; /* protected by i_es_lock */
Zheng Liud3922a72013-07-01 08:12:37 -0400867 unsigned long i_touch_when; /* jiffies of last accessing */
Zheng Liuc0677e62012-11-08 15:18:54 -0500868
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400869 /* ialloc */
870 ext4_group_t i_last_alloc_group;
871
872 /* allocation reservation info for delalloc */
Theodore Ts'o57042652011-09-09 18:56:51 -0400873 /* In case of bigalloc, these refer to clusters rather than blocks */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400874 unsigned int i_reserved_data_blocks;
875 unsigned int i_reserved_meta_blocks;
876 unsigned int i_allocated_meta_blocks;
Theodore Ts'o01f49d02011-01-10 12:13:03 -0500877 ext4_lblk_t i_da_metadata_calc_last_lblock;
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500878 int i_da_metadata_calc_len;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400879
880 /* on-disk additional length */
881 __u16 i_extra_isize;
882
Tao Ma67cf5b02012-12-10 14:04:46 -0500883 /* Indicate the inline data space. */
884 u16 i_inline_off;
885 u16 i_inline_size;
886
Dmitry Monakhova9e7f442009-12-14 15:21:14 +0300887#ifdef CONFIG_QUOTA
888 /* quota space reservation, managed internally by quota code */
889 qsize_t i_reserved_quota;
890#endif
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400891
Jan Kara2e8fa542013-06-04 14:21:02 -0400892 /* Lock protecting lists below */
Jiaying Zhang744692d2010-03-04 16:14:02 -0500893 spinlock_t i_completed_io_lock;
Jan Kara2e8fa542013-06-04 14:21:02 -0400894 /*
895 * Completed IOs that need unwritten extents handling and have
896 * transaction reserved
897 */
898 struct list_head i_rsv_conversion_list;
899 /*
900 * Completed IOs that need unwritten extents handling and don't have
901 * transaction reserved
902 */
903 struct list_head i_unrsv_conversion_list;
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500904 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
Dmitry Monakhove27f41e2012-09-28 23:24:52 -0400905 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
Jan Kara2e8fa542013-06-04 14:21:02 -0400906 struct work_struct i_rsv_conversion_work;
907 struct work_struct i_unrsv_conversion_work;
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500908
909 spinlock_t i_block_reservation_lock;
Jan Karab436b9b2009-12-08 23:51:10 -0500910
911 /*
912 * Transactions that contain inode's metadata needed to complete
913 * fsync and fdatasync, respectively.
914 */
915 tid_t i_sync_tid;
916 tid_t i_datasync_tid;
Darrick J. Wong814525f2012-04-29 18:31:10 -0400917
918 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
919 __u32 i_csum_seed;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400920};
921
922/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700923 * File system states
924 */
Mingming Cao617ba132006-10-11 01:20:53 -0700925#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
926#define EXT4_ERROR_FS 0x0002 /* Errors detected */
927#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700928
929/*
Theodore Tso469108f2008-02-10 01:11:44 -0500930 * Misc. filesystem flags
931 */
932#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
933#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
934#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
935
936/*
Lukas Czerner68911002013-04-03 22:12:52 -0400937 * Mount flags set via mount options or defaults
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700938 */
Mingming Cao617ba132006-10-11 01:20:53 -0700939#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
940#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
941#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
942#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
943#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
Theodore Ts'o39ef17f2012-03-03 17:56:23 -0500944#define EXT4_MOUNT_ERRORS_MASK 0x00070
Mingming Cao617ba132006-10-11 01:20:53 -0700945#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
946#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
Mingming Cao617ba132006-10-11 01:20:53 -0700947#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
948#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
949#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
950#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
951#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
952#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
953#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
954#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
Theodore Ts'oafd46722009-03-16 23:12:23 -0400955#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
Mingming Cao617ba132006-10-11 01:20:53 -0700956#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
Mingming Cao617ba132006-10-11 01:20:53 -0700957#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
958#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
959#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Jiaying Zhang744692d2010-03-04 16:14:02 -0500960#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
Linus Torvaldsd4da6c92009-11-02 10:15:27 -0800961#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500962#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
Alex Tomas64769242008-07-11 19:27:31 -0400963#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400964#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400965#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
Eric Sandeen5328e632009-11-19 14:25:42 -0500966#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
Lukas Czernerbfff6872010-10-27 21:30:05 -0400967#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400968
Lukas Czerner68911002013-04-03 22:12:52 -0400969/*
970 * Mount flags set either automatically (could not be set by mount option)
971 * based on per file system feature or property or in special cases such as
972 * distinguishing between explicit mount option definition and default.
973 */
Theodore Ts'o56889782011-09-03 18:22:38 -0400974#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
975 specified delalloc */
Lukas Czerner68911002013-04-03 22:12:52 -0400976#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
977 size of blocksize * 8
978 blocks */
Theodore Ts'o56889782011-09-03 18:22:38 -0400979
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -0500980#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
981 ~EXT4_MOUNT_##opt
982#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
983 EXT4_MOUNT_##opt
Mingming Cao617ba132006-10-11 01:20:53 -0700984#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
985 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700986
Theodore Ts'oa2595b82010-12-15 20:30:48 -0500987#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
988 ~EXT4_MOUNT2_##opt
989#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
990 EXT4_MOUNT2_##opt
991#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
992 EXT4_MOUNT2_##opt)
993
Akinobu Mita597d5082011-12-28 20:32:07 -0500994#define ext4_test_and_set_bit __test_and_set_bit_le
995#define ext4_set_bit __set_bit_le
Mingming Cao617ba132006-10-11 01:20:53 -0700996#define ext4_set_bit_atomic ext2_set_bit_atomic
Akinobu Mita597d5082011-12-28 20:32:07 -0500997#define ext4_test_and_clear_bit __test_and_clear_bit_le
998#define ext4_clear_bit __clear_bit_le
Mingming Cao617ba132006-10-11 01:20:53 -0700999#define ext4_clear_bit_atomic ext2_clear_bit_atomic
Akinobu Mita50e01682011-03-23 16:42:07 -07001000#define ext4_test_bit test_bit_le
Akinobu Mita50e01682011-03-23 16:42:07 -07001001#define ext4_find_next_zero_bit find_next_zero_bit_le
1002#define ext4_find_next_bit find_next_bit_le
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001003
Yongqiang Yangc3e94d12011-07-26 22:05:53 -04001004extern void ext4_set_bits(void *bm, int cur, int len);
1005
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001006/*
1007 * Maximal mount counts between two filesystem checks
1008 */
Mingming Cao617ba132006-10-11 01:20:53 -07001009#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1010#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001011
1012/*
1013 * Behaviour when detecting errors
1014 */
Mingming Cao617ba132006-10-11 01:20:53 -07001015#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1016#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1017#define EXT4_ERRORS_PANIC 3 /* Panic */
1018#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001019
Darrick J. Wonge6153912012-04-29 18:23:10 -04001020/* Metadata checksum algorithm codes */
1021#define EXT4_CRC32C_CHKSUM 1
1022
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001023/*
1024 * Structure of the super block
1025 */
Mingming Cao617ba132006-10-11 01:20:53 -07001026struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001027/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001028 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001029 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1030 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001031/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1032 __le32 s_first_data_block; /* First Data Block */
1033 __le32 s_log_block_size; /* Block size */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001034 __le32 s_log_cluster_size; /* Allocation cluster size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001035/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001036 __le32 s_clusters_per_group; /* # Clusters per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001037 __le32 s_inodes_per_group; /* # Inodes per group */
1038 __le32 s_mtime; /* Mount time */
1039/*30*/ __le32 s_wtime; /* Write time */
1040 __le16 s_mnt_count; /* Mount count */
1041 __le16 s_max_mnt_count; /* Maximal mount count */
1042 __le16 s_magic; /* Magic signature */
1043 __le16 s_state; /* File system state */
1044 __le16 s_errors; /* Behaviour when detecting errors */
1045 __le16 s_minor_rev_level; /* minor revision level */
1046/*40*/ __le32 s_lastcheck; /* time of last check */
1047 __le32 s_checkinterval; /* max. time between checks */
1048 __le32 s_creator_os; /* OS */
1049 __le32 s_rev_level; /* Revision level */
1050/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1051 __le16 s_def_resgid; /* Default gid for reserved blocks */
1052 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001053 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001054 *
1055 * Note: the difference between the compatible feature set and
1056 * the incompatible feature set is that if there is a bit set
1057 * in the incompatible feature set that the kernel doesn't
1058 * know about, it should refuse to mount the filesystem.
1059 *
1060 * e2fsck's requirements are more strict; if it doesn't know
1061 * about a feature in either the compatible or incompatible
1062 * feature set, it must abort and not try to meddle with
1063 * things it doesn't understand...
1064 */
1065 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001066 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001067 __le16 s_block_group_nr; /* block group # of this superblock */
1068 __le32 s_feature_compat; /* compatible feature set */
1069/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1070 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1071/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1072/*78*/ char s_volume_name[16]; /* volume name */
1073/*88*/ char s_last_mounted[64]; /* directory where last mounted */
1074/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1075 /*
1076 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -07001077 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001078 */
1079 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1080 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1081 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1082 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001083 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001084 */
1085/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1086/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1087 __le32 s_journal_dev; /* device number of journal file */
1088 __le32 s_last_orphan; /* start of list of inodes to delete */
1089 __le32 s_hash_seed[4]; /* HTREE hash seed */
1090 __u8 s_def_hash_version; /* Default hash version to use */
Theodore Ts'o89eeddf2010-07-27 11:56:04 -04001091 __u8 s_jnl_backup_type;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001092 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001093/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001094 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001095 __le32 s_mkfs_time; /* When the filesystem was created */
1096 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1097 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1098/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1099 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1100 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -04001101 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1102 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1103 __le32 s_flags; /* Miscellaneous flags */
1104 __le16 s_raid_stride; /* RAID stride */
Johann Lombardic5e06d12011-05-24 18:31:25 -04001105 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -04001106 __le64 s_mmp_block; /* Block for multi-mount protection */
1107 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001108 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
Darrick J. Wonge6153912012-04-29 18:23:10 -04001109 __u8 s_checksum_type; /* metadata checksum algorithm used */
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001110 __le16 s_reserved_pad;
Theodore Ts'oafc32f72009-02-28 19:39:58 -05001111 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
Theodore Ts'o4a9cdec2010-06-29 11:00:23 -04001112 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1113 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1114 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1115 snapshot's future use */
1116 __le32 s_snapshot_list; /* inode number of the head of the
1117 on-disk snapshot list */
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04001118#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1119 __le32 s_error_count; /* number of fs errors */
1120 __le32 s_first_error_time; /* first time an error happened */
1121 __le32 s_first_error_ino; /* inode involved in first error */
1122 __le64 s_first_error_block; /* block involved of first error */
1123 __u8 s_first_error_func[32]; /* function where the error happened */
1124 __le32 s_first_error_line; /* line number where error happened */
1125 __le32 s_last_error_time; /* most recent time of an error */
1126 __le32 s_last_error_ino; /* inode involved in last error */
1127 __le32 s_last_error_line; /* line number where error happened */
1128 __le64 s_last_error_block; /* block involved of last error */
1129 __u8 s_last_error_func[32]; /* function where the error happened */
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001130#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1131 __u8 s_mount_opts[64];
Theodore Ts'o281b5992011-09-09 18:34:51 -04001132 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1133 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1134 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
Darrick J. Wonge6153912012-04-29 18:23:10 -04001135 __le32 s_reserved[108]; /* Padding to the end of the block */
1136 __le32 s_checksum; /* crc32c(superblock) */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001137};
1138
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04001139#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1140
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001141#ifdef __KERNEL__
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001142
1143/*
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001144 * run-time mount flags
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001145 */
1146#define EXT4_MF_MNTDIR_SAMPLED 0x0001
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001147#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001148
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001149/*
1150 * fourth extended-fs super-block data in memory
1151 */
1152struct ext4_sb_info {
1153 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1154 unsigned long s_inodes_per_block;/* Number of inodes per block */
1155 unsigned long s_blocks_per_group;/* Number of blocks in a group */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001156 unsigned long s_clusters_per_group; /* Number of clusters in a group */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001157 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1158 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1159 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1160 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1161 ext4_group_t s_groups_count; /* Number of groups in the fs */
Eric Sandeenfb0a3872009-09-16 14:45:10 -04001162 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
Theodore Ts'o952fc182012-07-09 16:27:05 -04001163 unsigned long s_overhead; /* # of fs overhead clusters */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001164 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1165 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001166 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1167 struct buffer_head * s_sbh; /* Buffer containing the super block */
1168 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1169 struct buffer_head **s_group_desc;
Theodore Ts'o7f4520c2009-06-13 10:09:41 -04001170 unsigned int s_mount_opt;
Theodore Ts'oa2595b82010-12-15 20:30:48 -05001171 unsigned int s_mount_opt2;
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001172 unsigned int s_mount_flags;
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001173 unsigned int s_def_mount_opt;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001174 ext4_fsblk_t s_sb_block;
Lukas Czerner27dd4382013-04-09 22:11:22 -04001175 atomic64_t s_resv_clusters;
Eric W. Biederman08cefc72012-02-07 15:41:49 -08001176 kuid_t s_resuid;
1177 kgid_t s_resgid;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001178 unsigned short s_mount_state;
1179 unsigned short s_pad;
1180 int s_addr_per_block_bits;
1181 int s_desc_per_block_bits;
1182 int s_inode_size;
1183 int s_first_ino;
1184 unsigned int s_inode_readahead_blks;
Andreas Dilger11013912009-06-13 11:45:35 -04001185 unsigned int s_inode_goal;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001186 spinlock_t s_next_gen_lock;
1187 u32 s_next_generation;
1188 u32 s_hash_seed[4];
1189 int s_def_hash_version;
1190 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
Theodore Ts'o57042652011-09-09 18:56:51 -04001191 struct percpu_counter s_freeclusters_counter;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001192 struct percpu_counter s_freeinodes_counter;
1193 struct percpu_counter s_dirs_counter;
Theodore Ts'o57042652011-09-09 18:56:51 -04001194 struct percpu_counter s_dirtyclusters_counter;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001195 struct blockgroup_lock *s_blockgroup_lock;
1196 struct proc_dir_entry *s_proc;
1197 struct kobject s_kobj;
1198 struct completion s_kobj_unregister;
Theodore Ts'o2c0544b2012-05-30 22:56:46 -04001199 struct super_block *s_sb;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001200
1201 /* Journaling */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001202 struct journal_s *s_journal;
1203 struct list_head s_orphan;
1204 struct mutex s_orphan_lock;
Yongqiang Yang8f82f842011-07-26 21:35:44 -04001205 unsigned long s_resize_flags; /* Flags indicating if there
1206 is a resizer */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001207 unsigned long s_commit_interval;
1208 u32 s_max_batch_time;
1209 u32 s_min_batch_time;
1210 struct block_device *journal_bdev;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001211#ifdef CONFIG_QUOTA
1212 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1213 int s_jquota_fmt; /* Format of quota to use */
1214#endif
1215 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001216 struct rb_root system_blks;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001217
1218#ifdef EXTENTS_STATS
1219 /* ext4 extents stats */
1220 unsigned long s_ext_min;
1221 unsigned long s_ext_max;
1222 unsigned long s_depth_max;
1223 spinlock_t s_ext_stats_lock;
1224 unsigned long s_ext_blocks;
1225 unsigned long s_ext_extents;
1226#endif
1227
1228 /* for buddy allocator */
1229 struct ext4_group_info ***s_group_info;
1230 struct inode *s_buddy_cache;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001231 spinlock_t s_md_lock;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001232 unsigned short *s_mb_offsets;
1233 unsigned int *s_mb_maxs;
Theodore Ts'o28623c22012-09-05 01:31:50 -04001234 unsigned int s_group_info_size;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001235
1236 /* tunables */
1237 unsigned long s_stripe;
1238 unsigned int s_mb_stream_request;
1239 unsigned int s_mb_max_to_scan;
1240 unsigned int s_mb_min_to_scan;
1241 unsigned int s_mb_stats;
1242 unsigned int s_mb_order2_reqs;
1243 unsigned int s_mb_group_prealloc;
Theodore Ts'odf981d02012-08-17 09:48:17 -04001244 unsigned int s_max_dir_size_kb;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001245 /* where last allocation was done - for stream allocation */
1246 unsigned long s_mb_last_group;
1247 unsigned long s_mb_last_start;
1248
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001249 /* stats for buddy allocator */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001250 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1251 atomic_t s_bal_success; /* we found long enough chunks */
1252 atomic_t s_bal_allocated; /* in blocks */
1253 atomic_t s_bal_ex_scanned; /* total extents scanned */
1254 atomic_t s_bal_goals; /* goal hits */
1255 atomic_t s_bal_breaks; /* too long searches */
1256 atomic_t s_bal_2orders; /* 2^order hits */
1257 spinlock_t s_bal_lock;
1258 unsigned long s_mb_buddies_generated;
1259 unsigned long long s_mb_generation_time;
1260 atomic_t s_mb_lost_chunks;
1261 atomic_t s_mb_preallocated;
1262 atomic_t s_mb_discarded;
Theodore Ts'o50797482009-09-18 13:34:02 -04001263 atomic_t s_lock_busy;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001264
1265 /* locality groups */
Tejun Heo003cb602010-02-02 14:39:01 +09001266 struct ext4_locality_group __percpu *s_locality_groups;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001267
1268 /* for write statistics */
1269 unsigned long s_sectors_written_start;
1270 u64 s_kbytes_written;
1271
Zheng Liu67a5da52012-08-17 09:54:17 -04001272 /* the size of zero-out chunk */
1273 unsigned int s_extent_max_zeroout_kb;
1274
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001275 unsigned int s_log_groups_per_flex;
1276 struct flex_groups *s_flex_groups;
Theodore Ts'o117fff12012-09-05 01:29:50 -04001277 ext4_group_t s_flex_groups_allocated;
Mingming Cao4c0425f2009-09-28 15:48:41 -04001278
Jan Kara2e8fa542013-06-04 14:21:02 -04001279 /* workqueue for unreserved extent convertions (dio) */
1280 struct workqueue_struct *unrsv_conversion_wq;
1281 /* workqueue for reserved extent conversions (buffered io) */
1282 struct workqueue_struct *rsv_conversion_wq;
Theodore Ts'o66e61a92010-07-27 11:56:04 -04001283
1284 /* timer for periodic error stats printing */
1285 struct timer_list s_err_report;
Lukas Czernerbfff6872010-10-27 21:30:05 -04001286
1287 /* Lazy inode table initialization info */
1288 struct ext4_li_request *s_li_request;
1289 /* Wait multiplier for lazy initialization thread */
1290 unsigned int s_li_wait_mult;
Johann Lombardic5e06d12011-05-24 18:31:25 -04001291
1292 /* Kernel thread for multiple mount protection */
1293 struct task_struct *s_mmp_tsk;
Tao Ma3d56b8d2011-07-11 00:03:38 -04001294
1295 /* record the last minlen when FITRIM is called. */
1296 atomic_t s_last_trim_minblks;
Darrick J. Wong04419842012-04-29 18:27:10 -04001297
1298 /* Reference to checksum algorithm driver via cryptoapi */
1299 struct crypto_shash *s_chksum_driver;
Darrick J. Wonga9c473172012-04-29 18:29:10 -04001300
1301 /* Precomputed FS UUID checksum for seeding other checksums */
1302 __u32 s_csum_seed;
Zheng Liu74cd15c2013-02-18 00:32:55 -05001303
1304 /* Reclaim extents from extent status tree */
1305 struct shrinker s_es_shrinker;
1306 struct list_head s_es_lru;
Zheng Liud3922a72013-07-01 08:12:37 -04001307 unsigned long s_es_last_sorted;
Theodore Ts'o1ac64662013-03-02 10:27:46 -05001308 struct percpu_counter s_extent_cache_cnt;
Zheng Liu74cd15c2013-02-18 00:32:55 -05001309 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001310};
1311
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001312static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001313{
1314 return sb->s_fs_info;
1315}
Mingming Cao617ba132006-10-11 01:20:53 -07001316static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001317{
Mingming Cao617ba132006-10-11 01:20:53 -07001318 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001319}
1320
Kalpak Shahef7f3832007-07-18 09:15:20 -04001321static inline struct timespec ext4_current_time(struct inode *inode)
1322{
1323 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1324 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1325}
1326
Mingming Cao617ba132006-10-11 01:20:53 -07001327static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001328{
Mingming Cao617ba132006-10-11 01:20:53 -07001329 return ino == EXT4_ROOT_INO ||
Aditya Kali7c319d32012-07-22 20:21:31 -04001330 ino == EXT4_USR_QUOTA_INO ||
1331 ino == EXT4_GRP_QUOTA_INO ||
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -04001332 ino == EXT4_BOOT_LOADER_INO ||
Mingming Cao617ba132006-10-11 01:20:53 -07001333 ino == EXT4_JOURNAL_INO ||
1334 ino == EXT4_RESIZE_INO ||
1335 (ino >= EXT4_FIRST_INO(sb) &&
1336 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001337}
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001338
Tao Ma0edeb712011-10-31 17:30:44 -04001339static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1340 struct ext4_io_end *io_end)
1341{
1342 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
Jan Kara6b523df2013-06-04 13:21:11 -04001343 /* Writeback has to have coversion transaction reserved */
1344 WARN_ON(EXT4_SB(inode->i_sb)->s_journal && !io_end->handle &&
1345 !(io_end->flag & EXT4_IO_END_DIRECT));
Tao Ma0edeb712011-10-31 17:30:44 -04001346 io_end->flag |= EXT4_IO_END_UNWRITTEN;
Dmitry Monakhove27f41e2012-09-28 23:24:52 -04001347 atomic_inc(&EXT4_I(inode)->i_unwritten);
Tao Ma0edeb712011-10-31 17:30:44 -04001348 }
1349}
1350
Dmitry Monakhovf45ee3a2012-09-28 23:21:09 -04001351static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1352{
1353 return inode->i_private;
1354}
1355
1356static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1357{
1358 inode->i_private = io;
1359}
1360
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001361/*
1362 * Inode dynamic state flags
1363 */
1364enum {
1365 EXT4_STATE_JDATA, /* journaled data exists */
1366 EXT4_STATE_NEW, /* inode is newly created */
1367 EXT4_STATE_XATTR, /* has in-inode xattrs */
1368 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1369 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1370 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1371 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
Frank Mayhar14ece102010-05-17 08:00:00 -04001372 EXT4_STATE_NEWENTRY, /* File just added to dir */
Theodore Ts'of2321092011-01-10 12:12:36 -05001373 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
Dmitry Monakhov17335dc2012-09-29 00:41:21 -04001374 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1375 nolocking */
Tao Ma67cf5b02012-12-10 14:04:46 -05001376 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
Theodore Ts'o74d553a2013-04-03 12:39:17 -04001377 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001378};
1379
Theodore Ts'o353eb832011-01-10 12:18:25 -05001380#define EXT4_INODE_BIT_FNS(name, field, offset) \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001381static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1382{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001383 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001384} \
1385static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1386{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001387 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001388} \
1389static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1390{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001391 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001392}
1393
Theodore Ts'o353eb832011-01-10 12:18:25 -05001394EXT4_INODE_BIT_FNS(flag, flags, 0)
1395#if (BITS_PER_LONG < 64)
1396EXT4_INODE_BIT_FNS(state, state_flags, 0)
1397
1398static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1399{
1400 (ei)->i_state_flags = 0;
1401}
1402#else
1403EXT4_INODE_BIT_FNS(state, flags, 32)
1404
1405static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1406{
1407 /* We depend on the fact that callers will set i_flags */
1408}
1409#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001410#else
Mingming Cao617ba132006-10-11 01:20:53 -07001411/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001412 * a kernel struct super_block. This will allow us to call the feature-test
1413 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -07001414#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001415#endif
1416
Mingming Cao617ba132006-10-11 01:20:53 -07001417#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001418
1419/*
1420 * Codes for operating systems
1421 */
Mingming Cao617ba132006-10-11 01:20:53 -07001422#define EXT4_OS_LINUX 0
1423#define EXT4_OS_HURD 1
1424#define EXT4_OS_MASIX 2
1425#define EXT4_OS_FREEBSD 3
1426#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001427
1428/*
1429 * Revision levels
1430 */
Mingming Cao617ba132006-10-11 01:20:53 -07001431#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1432#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001433
Mingming Cao617ba132006-10-11 01:20:53 -07001434#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1435#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001436
Mingming Cao617ba132006-10-11 01:20:53 -07001437#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001438
1439/*
1440 * Feature set definitions
1441 */
1442
Mingming Cao617ba132006-10-11 01:20:53 -07001443#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001444 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001445#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001446 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001447#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001448 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001449#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1450 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1451#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1452 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1453#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1454 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1455#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1456 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1457#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1458 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1459#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1460 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001461
Mingming Cao617ba132006-10-11 01:20:53 -07001462#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1463#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1464#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1465#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1466#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1467#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001468
Mingming Cao617ba132006-10-11 01:20:53 -07001469#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1470#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1471#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001472#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
Andreas Dilger717d50e2007-10-16 18:38:25 -04001473#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001474#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -04001475#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Aditya Kaliae812302011-05-24 19:00:39 -04001476#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
Theodore Ts'o281b5992011-09-09 18:34:51 -04001477#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
Darrick J. Wonge6153912012-04-29 18:23:10 -04001478/*
1479 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1480 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1481 * all other data structures' checksums. However, the METADATA_CSUM and
1482 * GDT_CSUM bits are mutually exclusive.
1483 */
Theodore Ts'o9b90e5e2012-01-04 22:01:53 -05001484#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001485
Mingming Cao617ba132006-10-11 01:20:53 -07001486#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1487#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1488#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1489#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1490#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -07001491#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001492#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001493#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
Jose R. Santosce421582007-10-16 18:38:25 -04001494#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Theodore Ts'of710b4b2010-01-25 03:31:32 -05001495#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1496#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
Theodore Ts'o856cbcf2012-02-20 17:53:01 -05001497#define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
Theodore Ts'o9b90e5e2012-01-04 22:01:53 -05001498#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
Tao Ma67cf5b02012-12-10 14:04:46 -05001499#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001500
Theodore Ts'o2035e772011-04-18 17:29:14 -04001501#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1502#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1503 EXT4_FEATURE_INCOMPAT_META_BG)
1504#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1505 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1506 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1507
1508#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1509#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1510 EXT4_FEATURE_INCOMPAT_RECOVER| \
1511 EXT4_FEATURE_INCOMPAT_META_BG)
1512#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1513 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1514 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1515
Mingming Cao617ba132006-10-11 01:20:53 -07001516#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1517#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1518 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -07001519 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001520 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -04001521 EXT4_FEATURE_INCOMPAT_64BIT| \
Johann Lombardic5e06d12011-05-24 18:31:25 -04001522 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
Tao Maf08225d2012-12-10 14:06:03 -05001523 EXT4_FEATURE_INCOMPAT_MMP | \
1524 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
Mingming Cao617ba132006-10-11 01:20:53 -07001525#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1526 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -04001527 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001528 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -04001529 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001530 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
Theodore Ts'o6f16b602011-09-09 19:06:51 -04001531 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
Darrick J. Wonge93376c2012-05-27 08:12:42 -04001532 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
Aditya Kali7c319d32012-07-22 20:21:31 -04001533 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1534 EXT4_FEATURE_RO_COMPAT_QUOTA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001535
1536/*
1537 * Default values for user and/or group using reserved blocks
1538 */
Mingming Cao617ba132006-10-11 01:20:53 -07001539#define EXT4_DEF_RESUID 0
1540#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001541
Theodore Ts'o240799c2008-10-09 23:53:47 -04001542#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1543
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001544/*
1545 * Default mount options
1546 */
Mingming Cao617ba132006-10-11 01:20:53 -07001547#define EXT4_DEFM_DEBUG 0x0001
1548#define EXT4_DEFM_BSDGROUPS 0x0002
1549#define EXT4_DEFM_XATTR_USER 0x0004
1550#define EXT4_DEFM_ACL 0x0008
1551#define EXT4_DEFM_UID16 0x0010
1552#define EXT4_DEFM_JMODE 0x0060
1553#define EXT4_DEFM_JMODE_DATA 0x0020
1554#define EXT4_DEFM_JMODE_ORDERED 0x0040
1555#define EXT4_DEFM_JMODE_WBACK 0x0060
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001556#define EXT4_DEFM_NOBARRIER 0x0100
1557#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1558#define EXT4_DEFM_DISCARD 0x0400
1559#define EXT4_DEFM_NODELALLOC 0x0800
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001560
1561/*
Theodore Ts'o30773842009-01-03 20:27:38 -05001562 * Default journal batch times
1563 */
1564#define EXT4_DEF_MIN_BATCH_TIME 0
1565#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1566
1567/*
Theodore Ts'oa4912122009-03-12 12:18:34 -04001568 * Minimum number of groups in a flexgroup before we separate out
1569 * directories into the first block group of a flexgroup
1570 */
1571#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1572
1573/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001574 * Structure of a directory entry
1575 */
Mingming Cao617ba132006-10-11 01:20:53 -07001576#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001577
Mingming Cao617ba132006-10-11 01:20:53 -07001578struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001579 __le32 inode; /* Inode number */
1580 __le16 rec_len; /* Directory entry length */
1581 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -07001582 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001583};
1584
1585/*
Mingming Cao617ba132006-10-11 01:20:53 -07001586 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001587 * stored in intel byte order, and the name_len field could never be
1588 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1589 * file_type field.
1590 */
Mingming Cao617ba132006-10-11 01:20:53 -07001591struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001592 __le32 inode; /* Inode number */
1593 __le16 rec_len; /* Directory entry length */
1594 __u8 name_len; /* Name length */
1595 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -07001596 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001597};
1598
1599/*
Darrick J. Wonge6153912012-04-29 18:23:10 -04001600 * This is a bogus directory entry at the end of each leaf block that
1601 * records checksums.
1602 */
1603struct ext4_dir_entry_tail {
1604 __le32 det_reserved_zero1; /* Pretend to be unused */
1605 __le16 det_rec_len; /* 12 */
1606 __u8 det_reserved_zero2; /* Zero name length */
1607 __u8 det_reserved_ft; /* 0xDE, fake file type */
1608 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1609};
1610
Tao Ma3c47d542012-12-10 14:05:59 -05001611#define EXT4_DIRENT_TAIL(block, blocksize) \
1612 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1613 ((blocksize) - \
1614 sizeof(struct ext4_dir_entry_tail))))
1615
Darrick J. Wonge6153912012-04-29 18:23:10 -04001616/*
Mingming Cao617ba132006-10-11 01:20:53 -07001617 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001618 * other bits are reserved for now.
1619 */
Mingming Cao617ba132006-10-11 01:20:53 -07001620#define EXT4_FT_UNKNOWN 0
1621#define EXT4_FT_REG_FILE 1
1622#define EXT4_FT_DIR 2
1623#define EXT4_FT_CHRDEV 3
1624#define EXT4_FT_BLKDEV 4
1625#define EXT4_FT_FIFO 5
1626#define EXT4_FT_SOCK 6
1627#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001628
Mingming Cao617ba132006-10-11 01:20:53 -07001629#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001630
Darrick J. Wonge6153912012-04-29 18:23:10 -04001631#define EXT4_FT_DIR_CSUM 0xDE
1632
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001633/*
Mingming Cao617ba132006-10-11 01:20:53 -07001634 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001635 *
1636 * NOTE: It must be a multiple of 4
1637 */
Mingming Cao617ba132006-10-11 01:20:53 -07001638#define EXT4_DIR_PAD 4
1639#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1640#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1641 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -05001642#define EXT4_MAX_REC_LEN ((1<<16)-1)
1643
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001644/*
Eric Sandeen0cfc9252010-08-05 01:46:37 -04001645 * If we ever get support for fs block sizes > page_size, we'll need
1646 * to remove the #if statements in the next two functions...
1647 */
1648static inline unsigned int
1649ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1650{
1651 unsigned len = le16_to_cpu(dlen);
1652
1653#if (PAGE_CACHE_SIZE >= 65536)
1654 if (len == EXT4_MAX_REC_LEN || len == 0)
1655 return blocksize;
1656 return (len & 65532) | ((len & 3) << 16);
1657#else
1658 return len;
1659#endif
1660}
1661
1662static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1663{
1664 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1665 BUG();
1666#if (PAGE_CACHE_SIZE >= 65536)
1667 if (len < 65536)
1668 return cpu_to_le16(len);
1669 if (len == blocksize) {
1670 if (blocksize == 65536)
1671 return cpu_to_le16(EXT4_MAX_REC_LEN);
1672 else
1673 return cpu_to_le16(0);
1674 }
1675 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1676#else
1677 return cpu_to_le16(len);
1678#endif
1679}
1680
1681/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001682 * Hash Tree Directory indexing
1683 * (c) Daniel Phillips, 2001
1684 */
1685
Eric Sandeen4074fe32007-10-16 18:38:25 -04001686#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1687 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001688 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
Mingming Cao617ba132006-10-11 01:20:53 -07001689#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1690#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001691
1692/* Legal values for the dx_root hash_version field: */
1693
1694#define DX_HASH_LEGACY 0
1695#define DX_HASH_HALF_MD4 1
1696#define DX_HASH_TEA 2
Theodore Ts'of99b2582008-10-28 13:21:44 -04001697#define DX_HASH_LEGACY_UNSIGNED 3
1698#define DX_HASH_HALF_MD4_UNSIGNED 4
1699#define DX_HASH_TEA_UNSIGNED 5
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001700
Darrick J. Wong04419842012-04-29 18:27:10 -04001701static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1702 const void *address, unsigned int length)
1703{
1704 struct {
1705 struct shash_desc shash;
Theodore Ts'o3108b542012-07-22 20:25:31 -04001706 char ctx[4];
Darrick J. Wong04419842012-04-29 18:27:10 -04001707 } desc;
1708 int err;
1709
Theodore Ts'o3108b542012-07-22 20:25:31 -04001710 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1711
Darrick J. Wong04419842012-04-29 18:27:10 -04001712 desc.shash.tfm = sbi->s_chksum_driver;
1713 desc.shash.flags = 0;
1714 *(u32 *)desc.ctx = crc;
1715
1716 err = crypto_shash_update(&desc.shash, address, length);
1717 BUG_ON(err);
1718
1719 return *(u32 *)desc.ctx;
1720}
1721
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001722#ifdef __KERNEL__
1723
1724/* hash info structure used by the directory hash */
1725struct dx_hash_info
1726{
1727 u32 hash;
1728 u32 minor_hash;
1729 int hash_version;
1730 u32 *seed;
1731};
1732
Fan Yongd1f52732012-03-18 22:44:40 -04001733
1734/* 32 and 64 bit signed EOF for dx directories */
1735#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1736#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1737
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001738
1739/*
Mingming Cao617ba132006-10-11 01:20:53 -07001740 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001741 */
1742#define HASH_NB_ALWAYS 1
1743
1744
1745/*
1746 * Describe an inode's exact location on disk and in memory
1747 */
Mingming Cao617ba132006-10-11 01:20:53 -07001748struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001749{
1750 struct buffer_head *bh;
1751 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001752 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001753};
1754
Mingming Cao617ba132006-10-11 01:20:53 -07001755static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001756{
Mingming Cao617ba132006-10-11 01:20:53 -07001757 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001758}
1759
1760/*
1761 * This structure is stuffed into the struct file's private_data field
1762 * for directories. It is where we put information so that we can do
1763 * readdir operations in hash tree order.
1764 */
1765struct dir_private_info {
1766 struct rb_root root;
1767 struct rb_node *curr_node;
1768 struct fname *extra_fname;
1769 loff_t last_pos;
1770 __u32 curr_hash;
1771 __u32 curr_minor_hash;
1772 __u32 next_hash;
1773};
1774
1775/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -07001776static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001777ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001778{
Mingming Cao617ba132006-10-11 01:20:53 -07001779 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1780 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001781}
1782
1783/*
1784 * Special error return code only used by dx_probe() and its callers.
1785 */
1786#define ERR_BAD_DX_DIR -75000
1787
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001788/*
Lukas Czernerbfff6872010-10-27 21:30:05 -04001789 * Timeout and state flag for lazy initialization inode thread.
1790 */
1791#define EXT4_DEF_LI_WAIT_MULT 10
1792#define EXT4_DEF_LI_MAX_START_DELAY 5
1793#define EXT4_LAZYINIT_QUIT 0x0001
1794#define EXT4_LAZYINIT_RUNNING 0x0002
1795
1796/*
1797 * Lazy inode table initialization info
1798 */
1799struct ext4_lazy_init {
1800 unsigned long li_state;
Lukas Czernerbfff6872010-10-27 21:30:05 -04001801 struct list_head li_request_list;
1802 struct mutex li_list_mtx;
1803};
1804
1805struct ext4_li_request {
1806 struct super_block *lr_super;
1807 struct ext4_sb_info *lr_sbi;
1808 ext4_group_t lr_next_group;
1809 struct list_head lr_request;
1810 unsigned long lr_next_sched;
1811 unsigned long lr_timeout;
1812};
1813
Lukas Czerner857ac882010-10-27 21:30:05 -04001814struct ext4_features {
1815 struct kobject f_kobj;
1816 struct completion f_kobj_unregister;
1817};
1818
Lukas Czernerbfff6872010-10-27 21:30:05 -04001819/*
Johann Lombardic5e06d12011-05-24 18:31:25 -04001820 * This structure will be used for multiple mount protection. It will be
1821 * written into the block number saved in the s_mmp_block field in the
1822 * superblock. Programs that check MMP should assume that if
1823 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1824 * to use the filesystem, regardless of how old the timestamp is.
1825 */
1826#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1827#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1828#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1829#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1830
1831struct mmp_struct {
1832 __le32 mmp_magic; /* Magic number for MMP */
1833 __le32 mmp_seq; /* Sequence no. updated periodically */
1834
1835 /*
1836 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1837 * purposes and do not affect the correctness of the algorithm
1838 */
1839 __le64 mmp_time; /* Time last updated */
1840 char mmp_nodename[64]; /* Node which last updated MMP block */
1841 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1842
1843 /*
1844 * mmp_check_interval is used to verify if the MMP block has been
1845 * updated on the block device. The value is updated based on the
1846 * maximum time to write the MMP block during an update cycle.
1847 */
1848 __le16 mmp_check_interval;
1849
1850 __le16 mmp_pad1;
Darrick J. Wonge6153912012-04-29 18:23:10 -04001851 __le32 mmp_pad2[226];
1852 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
Johann Lombardic5e06d12011-05-24 18:31:25 -04001853};
1854
1855/* arguments passed to the mmp thread */
1856struct mmpd_data {
1857 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1858 struct super_block *sb; /* super block of the fs */
1859};
1860
1861/*
1862 * Check interval multiplier
1863 * The MMP block is written every update interval and initially checked every
1864 * update interval x the multiplier (the value is then adapted based on the
1865 * write latency). The reason is that writes can be delayed under load and we
1866 * don't want readers to incorrectly assume that the filesystem is no longer
1867 * in use.
1868 */
1869#define EXT4_MMP_CHECK_MULT 2UL
1870
1871/*
1872 * Minimum interval for MMP checking in seconds.
1873 */
1874#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1875
1876/*
1877 * Maximum interval for MMP checking in seconds.
1878 */
1879#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1880
1881/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001882 * Function prototypes
1883 */
1884
1885/*
1886 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -07001887 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001888 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001889# define NORET_TYPE /**/
1890# define ATTRIB_NORET __attribute__((noreturn))
1891# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001892
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001893/* bitmap.c */
Theodore Ts'of6fb99c2012-06-30 19:14:57 -04001894extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
Darrick J. Wong41a246d2012-04-29 18:33:10 -04001895void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1896 struct ext4_group_desc *gdp,
1897 struct buffer_head *bh, int sz);
1898int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1899 struct ext4_group_desc *gdp,
1900 struct buffer_head *bh, int sz);
Darrick J. Wongfa77dcf2012-04-29 18:35:10 -04001901void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1902 struct ext4_group_desc *gdp,
Tao Ma79f1ba42012-10-22 00:34:32 -04001903 struct buffer_head *bh);
Darrick J. Wongfa77dcf2012-04-29 18:35:10 -04001904int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1905 struct ext4_group_desc *gdp,
Tao Ma79f1ba42012-10-22 00:34:32 -04001906 struct buffer_head *bh);
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001907
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001908/* balloc.c */
Lukas Czernerbd862982013-04-03 23:32:34 -04001909extern void ext4_get_group_no_and_offset(struct super_block *sb,
1910 ext4_fsblk_t blocknr,
1911 ext4_group_t *blockgrpp,
1912 ext4_grpblk_t *offsetp);
1913extern ext4_group_t ext4_get_group_number(struct super_block *sb,
1914 ext4_fsblk_t block);
1915
Darrick J. Wongfa77dcf2012-04-29 18:35:10 -04001916extern void ext4_validate_block_bitmap(struct super_block *sb,
1917 struct ext4_group_desc *desc,
1918 unsigned int block_group,
1919 struct buffer_head *bh);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001920extern unsigned int ext4_block_group(struct super_block *sb,
1921 ext4_fsblk_t blocknr);
1922extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1923 ext4_fsblk_t blocknr);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001924extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1925extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1926 ext4_group_t group);
Aneesh Kumar K.V7061eba2008-07-11 19:27:31 -04001927extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
Allison Henderson55f020d2011-05-25 07:41:26 -04001928 ext4_fsblk_t goal,
1929 unsigned int flags,
1930 unsigned long *count,
1931 int *errp);
Theodore Ts'oe7d5f312011-09-09 19:14:51 -04001932extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1933 s64 nclusters, unsigned int flags);
Theodore Ts'o5dee5432011-09-09 19:10:51 -04001934extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001935extern void ext4_check_blocks_bitmap(struct super_block *);
Mingming Cao617ba132006-10-11 01:20:53 -07001936extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001937 ext4_group_t block_group,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001938 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -07001939extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
Theodore Ts'o813e5722012-02-20 17:52:46 -05001940
1941extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1942 ext4_group_t block_group);
1943extern int ext4_wait_block_bitmap(struct super_block *sb,
1944 ext4_group_t block_group,
1945 struct buffer_head *bh);
1946extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1947 ext4_group_t block_group);
Theodore Ts'ofd034a82011-09-09 18:42:51 -04001948extern void ext4_init_block_bitmap(struct super_block *sb,
1949 struct buffer_head *bh,
1950 ext4_group_t group,
1951 struct ext4_group_desc *desc);
Theodore Ts'ocff1dfd72011-09-09 19:12:51 -04001952extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1953 ext4_group_t block_group,
1954 struct ext4_group_desc *gdp);
Theodore Ts'od5b8f312011-09-09 18:44:51 -04001955extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1956 ext4_group_t block_group,
1957 struct ext4_group_desc *gdp);
Eric Sandeenf86186b2011-06-28 10:01:31 -04001958ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001959
1960/* dir.c */
Theodore Ts'o60fd4da2010-07-27 11:54:40 -04001961extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
Theodore Ts'of7c21172011-01-10 12:10:55 -05001962 struct file *,
Theodore Ts'o60fd4da2010-07-27 11:54:40 -04001963 struct ext4_dir_entry_2 *,
Tao Ma226ba972012-12-10 14:05:58 -05001964 struct buffer_head *, char *, int,
1965 unsigned int);
1966#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
Theodore Ts'of7c21172011-01-10 12:10:55 -05001967 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
Tao Ma226ba972012-12-10 14:05:58 -05001968 (de), (bh), (buf), (size), (offset)))
Mingming Cao617ba132006-10-11 01:20:53 -07001969extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001970 __u32 minor_hash,
Mingming Cao617ba132006-10-11 01:20:53 -07001971 struct ext4_dir_entry_2 *dirent);
1972extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Tao Ma978fef92012-12-10 14:05:58 -05001973extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
1974 struct buffer_head *bh,
1975 void *buf, int buf_size,
1976 const char *name, int namelen,
1977 struct ext4_dir_entry_2 **dest_de);
1978void ext4_insert_dentry(struct inode *inode,
1979 struct ext4_dir_entry_2 *de,
1980 int buf_size,
1981 const char *name, int namelen);
1982static inline void ext4_update_dx_flag(struct inode *inode)
1983{
1984 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
1985 EXT4_FEATURE_COMPAT_DIR_INDEX))
1986 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
1987}
Tao Ma65d165d2012-12-10 14:05:59 -05001988static unsigned char ext4_filetype_table[] = {
1989 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1990};
1991
1992static inline unsigned char get_dtype(struct super_block *sb, int filetype)
1993{
1994 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
1995 (filetype >= EXT4_FT_MAX))
1996 return DT_UNKNOWN;
1997
1998 return ext4_filetype_table[filetype];
1999}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002000
2001/* fsync.c */
Josef Bacik02c24a82011-07-16 20:44:56 -04002002extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002003
2004/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002005extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002006 dx_hash_info *hinfo);
2007
2008/* ialloc.c */
Theodore Ts'o11395752013-02-09 16:27:09 -05002009extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2010 const struct qstr *qstr, __u32 goal,
2011 uid_t *owner, int handle_type,
2012 unsigned int line_no, int nblocks);
2013
2014#define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2015 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2016 0, 0, 0)
2017#define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2018 type, nblocks) \
2019 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2020 (type), __LINE__, (nblocks))
2021
2022
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002023extern void ext4_free_inode(handle_t *, struct inode *);
2024extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2025extern unsigned long ext4_count_free_inodes(struct super_block *);
2026extern unsigned long ext4_count_dirs(struct super_block *);
2027extern void ext4_check_inodes_bitmap(struct super_block *);
Theodore Ts'o61d08672010-10-27 21:30:15 -04002028extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002029extern int ext4_init_inode_table(struct super_block *sb,
2030 ext4_group_t group, int barrier);
Theodore Ts'o813e5722012-02-20 17:52:46 -05002031extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002032
Alex Tomasc9de5602008-01-29 00:19:52 -05002033/* mballoc.c */
2034extern long ext4_mb_stats;
2035extern long ext4_mb_max_to_scan;
Akira Fujita9d990122012-05-28 14:19:25 -04002036extern int ext4_mb_init(struct super_block *);
Alex Tomasc9de5602008-01-29 00:19:52 -05002037extern int ext4_mb_release(struct super_block *);
2038extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2039 struct ext4_allocation_request *, int *);
2040extern int ext4_mb_reserve_blocks(struct super_block *, int);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04002041extern void ext4_discard_preallocations(struct inode *);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002042extern int __init ext4_init_mballoc(void);
2043extern void ext4_exit_mballoc(void);
Theodore Ts'o44338712009-11-22 07:44:56 -05002044extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'oe6362602009-11-23 07:17:05 -05002045 struct buffer_head *bh, ext4_fsblk_t block,
2046 unsigned long count, int flags);
Theodore Ts'o28623c22012-09-05 01:31:50 -04002047extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2048 ext4_group_t ngroups);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05002049extern int ext4_mb_add_groupinfo(struct super_block *sb,
Frederic Bohe5f21b0e2008-07-11 19:27:31 -04002050 ext4_group_t i, struct ext4_group_desc *desc);
Yongqiang Yangcc7365d2011-07-26 21:46:07 -04002051extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
Amir Goldstein2846e822011-05-09 10:46:41 -04002052 ext4_fsblk_t block, unsigned long count);
Lukas Czerner7360d172010-10-27 21:30:12 -04002053extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2054
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002055/* inode.c */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002056struct buffer_head *ext4_getblk(handle_t *, struct inode *,
2057 ext4_lblk_t, int, int *);
2058struct buffer_head *ext4_bread(handle_t *, struct inode *,
2059 ext4_lblk_t, int, int *);
Tao Maf19d5872012-12-10 14:05:51 -05002060int ext4_get_block_write(struct inode *inode, sector_t iblock,
2061 struct buffer_head *bh_result, int create);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002062int ext4_get_block(struct inode *inode, sector_t iblock,
2063 struct buffer_head *bh_result, int create);
Tao Ma9c3569b2012-12-10 14:05:57 -05002064int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2065 struct buffer_head *bh, int create);
Tao Maf19d5872012-12-10 14:05:51 -05002066int ext4_walk_page_buffers(handle_t *handle,
2067 struct buffer_head *head,
2068 unsigned from,
2069 unsigned to,
2070 int *partial,
2071 int (*fn)(handle_t *handle,
2072 struct buffer_head *bh));
2073int do_journal_get_write_access(handle_t *handle,
2074 struct buffer_head *bh);
Tao Ma9c3569b2012-12-10 14:05:57 -05002075#define FALL_BACK_TO_NONDELALLOC 1
2076#define CONVERT_INLINE_DATA 2
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002077
David Howells1d1fe1e2008-02-07 00:15:37 -08002078extern struct inode *ext4_iget(struct super_block *, unsigned long);
Christoph Hellwiga9185b42010-03-05 09:21:37 +01002079extern int ext4_write_inode(struct inode *, struct writeback_control *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002080extern int ext4_setattr(struct dentry *, struct iattr *);
Mingming Cao3e3398a2008-07-11 19:27:31 -04002081extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2082 struct kstat *stat);
Al Viro0930fcc2010-06-07 13:16:22 -04002083extern void ext4_evict_inode(struct inode *);
2084extern void ext4_clear_inode(struct inode *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002085extern int ext4_sync_inode(handle_t *, struct inode *);
Christoph Hellwigaa385722011-05-27 06:53:02 -04002086extern void ext4_dirty_inode(struct inode *, int);
Mingming Cao617ba132006-10-11 01:20:53 -07002087extern int ext4_change_inode_journal_flag(struct inode *, int);
2088extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
Jan Karaa3612932013-08-16 21:19:41 -04002089extern int ext4_inode_attach_jinode(struct inode *inode);
Duane Griffin91ef4ca2008-07-11 19:27:31 -04002090extern int ext4_can_truncate(struct inode *inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002091extern void ext4_truncate(struct inode *);
Ashish Sangwanaeb28172013-07-01 08:12:38 -04002092extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
Jan Kara487caee2009-08-17 22:17:20 -04002093extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
Mingming Cao617ba132006-10-11 01:20:53 -07002094extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -04002095extern void ext4_get_inode_flags(struct ext4_inode_info *);
Theodore Ts'occd25062009-02-26 01:04:07 -05002096extern int ext4_alloc_da_blocks(struct inode *inode);
Mingming Cao617ba132006-10-11 01:20:53 -07002097extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07002098extern int ext4_writepage_trans_blocks(struct inode *);
Mingming Caof3bd1f32008-08-19 22:16:03 -04002099extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
Lukas Czernerd863dc32013-05-27 23:32:35 -04002100extern int ext4_block_truncate_page(handle_t *handle,
2101 struct address_space *mapping, loff_t from);
2102extern int ext4_block_zero_page_range(handle_t *handle,
2103 struct address_space *mapping, loff_t from, loff_t length);
Lukas Czernera87dd182013-05-27 23:32:35 -04002104extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2105 loff_t lstart, loff_t lend);
Nick Pigginc2ec1752009-03-31 15:23:21 -07002106extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
Dmitry Monakhova9e7f442009-12-14 15:21:14 +03002107extern qsize_t *ext4_get_reserved_space(struct inode *inode);
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05002108extern void ext4_da_update_reserve_space(struct inode *inode,
2109 int used, int quota_claim);
Amir Goldsteindae1e522011-06-27 19:40:50 -04002110
2111/* indirect.c */
2112extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2113 struct ext4_map_blocks *map, int flags);
2114extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2115 const struct iovec *iov, loff_t offset,
2116 unsigned long nr_segs);
2117extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
Jan Karafa55a0e2013-06-04 12:56:55 -04002118extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
Theodore Ts'o819c4922013-04-03 12:47:17 -04002119extern void ext4_ind_truncate(handle_t *, struct inode *inode);
Theodore Ts'o26a4c0c2013-04-03 12:45:17 -04002120extern int ext4_free_hole_blocks(handle_t *handle, struct inode *inode,
2121 ext4_lblk_t first, ext4_lblk_t stop);
Amir Goldsteinff9893d2011-06-27 16:36:31 -04002122
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002123/* ioctl.c */
Andi Kleen5cdd7b22008-04-29 22:03:54 -04002124extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002125extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002126
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05002127/* migrate.c */
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -04002128extern int ext4_ext_migrate(struct inode *);
Lukas Czerner0d14b092013-04-10 23:32:52 -04002129extern int ext4_ind_migrate(struct inode *inode);
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002130
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002131/* namei.c */
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002132extern int ext4_dirent_csum_verify(struct inode *inode,
2133 struct ext4_dir_entry *dirent);
Mingming Cao617ba132006-10-11 01:20:53 -07002134extern int ext4_orphan_add(handle_t *, struct inode *);
2135extern int ext4_orphan_del(handle_t *, struct inode *);
2136extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002137 __u32 start_minor_hash, __u32 *next_hash);
Tao Ma7335cd32012-12-10 14:05:59 -05002138extern int search_dir(struct buffer_head *bh,
2139 char *search_buf,
2140 int buf_size,
2141 struct inode *dir,
2142 const struct qstr *d_name,
2143 unsigned int offset,
2144 struct ext4_dir_entry_2 **res_dir);
Tao Ma05019a92012-12-10 14:06:00 -05002145extern int ext4_generic_delete_entry(handle_t *handle,
2146 struct inode *dir,
2147 struct ext4_dir_entry_2 *de_del,
2148 struct buffer_head *bh,
2149 void *entry_buf,
2150 int buf_size,
2151 int csum_size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002152
2153/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002154extern int ext4_group_add(struct super_block *sb,
2155 struct ext4_new_group_data *input);
2156extern int ext4_group_extend(struct super_block *sb,
2157 struct ext4_super_block *es,
2158 ext4_fsblk_t n_blocks_count);
Yongqiang Yang19c52462012-01-04 17:09:44 -05002159extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002160
2161/* super.c */
Theodore Ts'o952fc182012-07-09 16:27:05 -04002162extern int ext4_calculate_overhead(struct super_block *sb);
Darrick J. Wonga9c473172012-04-29 18:29:10 -04002163extern int ext4_superblock_csum_verify(struct super_block *sb,
2164 struct ext4_super_block *es);
Theodore Ts'o06db49e2012-10-10 01:06:58 -04002165extern void ext4_superblock_csum_set(struct super_block *sb);
Theodore Ts'o9933fc02011-08-01 08:45:02 -04002166extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2167extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2168extern void ext4_kvfree(void *ptr);
Theodore Ts'o117fff12012-09-05 01:29:50 -04002169extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2170 ext4_group_t ngroup);
Theodore Ts'o722887d2013-02-08 13:00:31 -05002171extern const char *ext4_decode_error(struct super_block *sb, int errno,
2172 char nbuf[16]);
Joe Perchese7c96e82013-07-01 08:12:37 -04002173
Joe Perchesb9075fa2011-10-31 17:11:33 -07002174extern __printf(4, 5)
2175void __ext4_error(struct super_block *, const char *, unsigned int,
2176 const char *, ...);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002177extern __printf(5, 6)
Joe Perchese7c96e82013-07-01 08:12:37 -04002178void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
Joe Perchesb9075fa2011-10-31 17:11:33 -07002179 const char *, ...);
2180extern __printf(5, 6)
Joe Perchese7c96e82013-07-01 08:12:37 -04002181void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
Joe Perchesb9075fa2011-10-31 17:11:33 -07002182 const char *, ...);
Theodore Ts'oc398eda2010-07-27 11:56:40 -04002183extern void __ext4_std_error(struct super_block *, const char *,
2184 unsigned int, int);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002185extern __printf(4, 5)
2186void __ext4_abort(struct super_block *, const char *, unsigned int,
2187 const char *, ...);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002188extern __printf(4, 5)
2189void __ext4_warning(struct super_block *, const char *, unsigned int,
2190 const char *, ...);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002191extern __printf(3, 4)
Joe Perchese7c96e82013-07-01 08:12:37 -04002192void __ext4_msg(struct super_block *, const char *, const char *, ...);
Johann Lombardic5e06d12011-05-24 18:31:25 -04002193extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2194 const char *, unsigned int, const char *);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002195extern __printf(7, 8)
2196void __ext4_grp_locked_error(const char *, unsigned int,
2197 struct super_block *, ext4_group_t,
2198 unsigned long, ext4_fsblk_t,
2199 const char *, ...);
Joe Perchese7c96e82013-07-01 08:12:37 -04002200
2201#ifdef CONFIG_PRINTK
2202
2203#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2204 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2205#define ext4_error_file(file, func, line, block, fmt, ...) \
2206 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2207#define ext4_error(sb, fmt, ...) \
2208 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2209#define ext4_abort(sb, fmt, ...) \
2210 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2211#define ext4_warning(sb, fmt, ...) \
2212 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2213#define ext4_msg(sb, level, fmt, ...) \
2214 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2215#define dump_mmp_msg(sb, mmp, msg) \
2216 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2217#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2218 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2219 fmt, ##__VA_ARGS__)
2220
2221#else
2222
2223#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2224do { \
2225 no_printk(fmt, ##__VA_ARGS__); \
2226 __ext4_error_inode(inode, "", 0, block, " "); \
2227} while (0)
2228#define ext4_error_file(file, func, line, block, fmt, ...) \
2229do { \
2230 no_printk(fmt, ##__VA_ARGS__); \
2231 __ext4_error_file(file, "", 0, block, " "); \
2232} while (0)
2233#define ext4_error(sb, fmt, ...) \
2234do { \
2235 no_printk(fmt, ##__VA_ARGS__); \
2236 __ext4_error(sb, "", 0, " "); \
2237} while (0)
2238#define ext4_abort(sb, fmt, ...) \
2239do { \
2240 no_printk(fmt, ##__VA_ARGS__); \
2241 __ext4_abort(sb, "", 0, " "); \
2242} while (0)
2243#define ext4_warning(sb, fmt, ...) \
2244do { \
2245 no_printk(fmt, ##__VA_ARGS__); \
2246 __ext4_warning(sb, "", 0, " "); \
2247} while (0)
2248#define ext4_msg(sb, level, fmt, ...) \
2249do { \
2250 no_printk(fmt, ##__VA_ARGS__); \
2251 __ext4_msg(sb, "", " "); \
2252} while (0)
2253#define dump_mmp_msg(sb, mmp, msg) \
2254 __dump_mmp_msg(sb, mmp, "", 0, "")
2255#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2256do { \
2257 no_printk(fmt, ##__VA_ARGS__); \
2258 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2259} while (0)
2260
2261#endif
2262
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002263extern void ext4_update_dynamic_rev(struct super_block *sb);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -05002264extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2265 __u32 compat);
2266extern int ext4_update_rocompat_feature(handle_t *handle,
2267 struct super_block *sb, __u32 rocompat);
2268extern int ext4_update_incompat_feature(handle_t *handle,
2269 struct super_block *sb, __u32 incompat);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002270extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2271 struct ext4_group_desc *bg);
2272extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2273 struct ext4_group_desc *bg);
2274extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2275 struct ext4_group_desc *bg);
Theodore Ts'o021b65b2011-09-09 19:08:51 -04002276extern __u32 ext4_free_group_clusters(struct super_block *sb,
2277 struct ext4_group_desc *bg);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05002278extern __u32 ext4_free_inodes_count(struct super_block *sb,
2279 struct ext4_group_desc *bg);
2280extern __u32 ext4_used_dirs_count(struct super_block *sb,
2281 struct ext4_group_desc *bg);
2282extern __u32 ext4_itable_unused_count(struct super_block *sb,
2283 struct ext4_group_desc *bg);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002284extern void ext4_block_bitmap_set(struct super_block *sb,
2285 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2286extern void ext4_inode_bitmap_set(struct super_block *sb,
2287 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2288extern void ext4_inode_table_set(struct super_block *sb,
2289 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Theodore Ts'o021b65b2011-09-09 19:08:51 -04002290extern void ext4_free_group_clusters_set(struct super_block *sb,
2291 struct ext4_group_desc *bg,
2292 __u32 count);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05002293extern void ext4_free_inodes_set(struct super_block *sb,
2294 struct ext4_group_desc *bg, __u32 count);
2295extern void ext4_used_dirs_set(struct super_block *sb,
2296 struct ext4_group_desc *bg, __u32 count);
2297extern void ext4_itable_unused_set(struct super_block *sb,
2298 struct ext4_group_desc *bg, __u32 count);
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002299extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
Theodore Ts'obb23c202009-05-01 19:44:44 -04002300 struct ext4_group_desc *gdp);
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002301extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2302 struct ext4_group_desc *gdp);
Theodore Ts'o7f511862013-01-13 08:41:45 -05002303extern int ext4_register_li_request(struct super_block *sb,
2304 ext4_group_t first_not_zeroed);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002305
Darrick J. Wong41a246d2012-04-29 18:33:10 -04002306static inline int ext4_has_group_desc_csum(struct super_block *sb)
2307{
2308 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2309 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2310 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2311}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002312
2313static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2314{
2315 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04002316 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002317}
2318
2319static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2320{
2321 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002322 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002323}
2324
2325static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2326{
2327 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002328 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002329}
2330
2331static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2332 ext4_fsblk_t blk)
2333{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04002334 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002335 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2336}
2337
2338static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2339 ext4_fsblk_t blk)
2340{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002341 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002342 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2343}
2344
2345static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2346 ext4_fsblk_t blk)
2347{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002348 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002349 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2350}
2351
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002352static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2353{
Theodore Ts'o06a279d2009-01-17 18:41:37 -05002354 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2355 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2356 le32_to_cpu(raw_inode->i_size_lo);
2357 else
2358 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002359}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002360
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002361static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2362{
2363 raw_inode->i_size_lo = cpu_to_le32(i_size);
2364 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2365}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002366
Alex Tomasc9de5602008-01-29 00:19:52 -05002367static inline
2368struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002369 ext4_group_t group)
Alex Tomasc9de5602008-01-29 00:19:52 -05002370{
2371 struct ext4_group_info ***grp_info;
2372 long indexv, indexh;
Theodore Ts'o2f2e09e2013-06-06 11:16:43 -04002373 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
Alex Tomasc9de5602008-01-29 00:19:52 -05002374 grp_info = EXT4_SB(sb)->s_group_info;
2375 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2376 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2377 return grp_info[indexv][indexh];
2378}
2379
Theodore Ts'o8df96752009-05-01 08:50:38 -04002380/*
2381 * Reading s_groups_count requires using smp_rmb() afterwards. See
2382 * the locking protocol documented in the comments of ext4_group_add()
2383 * in resize.c
2384 */
2385static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2386{
2387 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2388
2389 smp_rmb();
2390 return ngroups;
2391}
Alex Tomasc9de5602008-01-29 00:19:52 -05002392
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002393static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2394 ext4_group_t block_group)
2395{
2396 return block_group >> sbi->s_log_groups_per_flex;
2397}
2398
2399static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2400{
2401 return 1 << sbi->s_log_groups_per_flex;
2402}
2403
Mingming Cao617ba132006-10-11 01:20:53 -07002404#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002405do { \
2406 if ((errno)) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -04002407 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002408} while (0)
2409
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002410#ifdef CONFIG_SMP
Theodore Ts'odf55c992011-09-09 19:16:51 -04002411/* Each CPU can accumulate percpu_counter_batch clusters in their local
2412 * counters. So we need to make sure we have free clusters more
Eric Dumazet179f7eb2009-01-06 14:41:04 -08002413 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002414 */
Theodore Ts'odf55c992011-09-09 19:16:51 -04002415#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002416#else
Theodore Ts'odf55c992011-09-09 19:16:51 -04002417#define EXT4_FREECLUSTERS_WATERMARK 0
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002418#endif
2419
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04002420static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2421{
2422 /*
2423 * XXX: replace with spinlock if seen contended -bzzz
2424 */
2425 down_write(&EXT4_I(inode)->i_data_sem);
2426 if (newsize > EXT4_I(inode)->i_disksize)
2427 EXT4_I(inode)->i_disksize = newsize;
2428 up_write(&EXT4_I(inode)->i_data_sem);
2429 return ;
2430}
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002431
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002432struct ext4_group_info {
2433 unsigned long bb_state;
2434 struct rb_root bb_free_root;
Eric Sandeena36b4492009-08-25 22:36:45 -04002435 ext4_grpblk_t bb_first_free; /* first free block */
2436 ext4_grpblk_t bb_free; /* total free blocks */
2437 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
Curt Wohlgemuth8a57d9d2010-05-16 15:00:00 -04002438 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002439 struct list_head bb_prealloc_list;
2440#ifdef DOUBLE_CHECK
2441 void *bb_bitmap;
2442#endif
2443 struct rw_semaphore alloc_sem;
Eric Sandeena36b4492009-08-25 22:36:45 -04002444 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2445 * regions, index is order.
2446 * bb_counters[3] = 5 means
2447 * 5 free 8-block regions. */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002448};
2449
Tao Ma3d56b8d2011-07-11 00:03:38 -04002450#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2451#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002452
2453#define EXT4_MB_GRP_NEED_INIT(grp) \
2454 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2455
Tao Ma3d56b8d2011-07-11 00:03:38 -04002456#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2457 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2458#define EXT4_MB_GRP_SET_TRIMMED(grp) \
2459 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2460#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2461 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2462
Theodore Ts'o50797482009-09-18 13:34:02 -04002463#define EXT4_MAX_CONTENTION 8
2464#define EXT4_CONTENTION_THRESHOLD 2
2465
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002466static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2467 ext4_group_t group)
2468{
2469 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2470}
2471
Theodore Ts'o50797482009-09-18 13:34:02 -04002472/*
2473 * Returns true if the filesystem is busy enough that attempts to
2474 * access the block group locks has run into contention.
2475 */
2476static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2477{
2478 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2479}
2480
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002481static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2482{
Theodore Ts'o50797482009-09-18 13:34:02 -04002483 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2484 if (spin_trylock(lock))
2485 /*
2486 * We're able to grab the lock right away, so drop the
2487 * lock contention counter.
2488 */
2489 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2490 else {
2491 /*
2492 * The lock is busy, so bump the contention counter,
2493 * and then wait on the spin lock.
2494 */
2495 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2496 EXT4_MAX_CONTENTION);
2497 spin_lock(lock);
2498 }
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002499}
2500
2501static inline void ext4_unlock_group(struct super_block *sb,
2502 ext4_group_t group)
2503{
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002504 spin_unlock(ext4_group_lock_ptr(sb, group));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002505}
2506
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002507/*
Theodore Ts'o1f7d1e72011-06-27 19:16:02 -04002508 * Block validity checking
2509 */
2510#define ext4_check_indirect_blockref(inode, bh) \
2511 ext4_check_blockref(__func__, __LINE__, inode, \
2512 (__le32 *)(bh)->b_data, \
2513 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2514
2515#define ext4_ind_check_inode(inode) \
2516 ext4_check_blockref(__func__, __LINE__, inode, \
2517 EXT4_I(inode)->i_data, \
2518 EXT4_NDIR_BLOCKS)
2519
2520/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002521 * Inodes and files operations
2522 */
2523
2524/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002525extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002526
2527/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002528extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07002529extern const struct file_operations ext4_file_operations;
Toshiyuki Okajimae0d10bf2010-10-27 21:30:06 -04002530extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
Dmitry Monakhovc2785312012-10-05 11:31:55 -04002531extern void ext4_unwritten_wait(struct inode *inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002532
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05002533/* inline.c */
2534extern int ext4_has_inline_data(struct inode *inode);
2535extern int ext4_get_inline_size(struct inode *inode);
2536extern int ext4_get_max_inline_size(struct inode *inode);
2537extern int ext4_find_inline_data_nolock(struct inode *inode);
2538extern void ext4_write_inline_data(struct inode *inode,
2539 struct ext4_iloc *iloc,
2540 void *buffer, loff_t pos,
2541 unsigned int len);
2542extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
2543 unsigned int len);
2544extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2545 unsigned int len);
2546extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2547
2548extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2549extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2550 struct inode *inode,
2551 loff_t pos, unsigned len,
2552 unsigned flags,
2553 struct page **pagep);
2554extern int ext4_write_inline_data_end(struct inode *inode,
2555 loff_t pos, unsigned len,
2556 unsigned copied,
2557 struct page *page);
2558extern struct buffer_head *
2559ext4_journalled_write_inline_data(struct inode *inode,
2560 unsigned len,
2561 struct page *page);
2562extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2563 struct inode *inode,
2564 loff_t pos, unsigned len,
2565 unsigned flags,
2566 struct page **pagep,
2567 void **fsdata);
2568extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2569 unsigned len, unsigned copied,
2570 struct page *page);
2571extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
2572 struct inode *inode);
2573extern int ext4_try_create_inline_dir(handle_t *handle,
2574 struct inode *parent,
2575 struct inode *inode);
2576extern int ext4_read_inline_dir(struct file *filp,
Al Viro725bebb2013-05-17 16:08:53 -04002577 struct dir_context *ctx,
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05002578 int *has_inline_data);
Tao Ma8af0f082013-04-19 17:53:09 -04002579extern int htree_inlinedir_to_tree(struct file *dir_file,
2580 struct inode *dir, ext4_lblk_t block,
2581 struct dx_hash_info *hinfo,
2582 __u32 start_hash, __u32 start_minor_hash,
2583 int *has_inline_data);
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05002584extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2585 const struct qstr *d_name,
2586 struct ext4_dir_entry_2 **res_dir,
2587 int *has_inline_data);
2588extern int ext4_delete_inline_entry(handle_t *handle,
2589 struct inode *dir,
2590 struct ext4_dir_entry_2 *de_del,
2591 struct buffer_head *bh,
2592 int *has_inline_data);
2593extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2594extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2595 struct ext4_dir_entry_2 **parent_de,
2596 int *retval);
2597extern int ext4_inline_data_fiemap(struct inode *inode,
2598 struct fiemap_extent_info *fieinfo,
2599 int *has_inline);
2600extern int ext4_try_to_evict_inline_data(handle_t *handle,
2601 struct inode *inode,
2602 int needed);
2603extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2604
2605extern int ext4_convert_inline_data(struct inode *inode);
2606
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002607/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002608extern const struct inode_operations ext4_dir_inode_operations;
2609extern const struct inode_operations ext4_special_inode_operations;
Theodore Ts'o596397b2009-05-01 13:49:15 -04002610extern struct dentry *ext4_get_parent(struct dentry *child);
Tao Maa774f9c2012-12-10 14:05:57 -05002611extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2612 struct ext4_dir_entry_2 *de,
2613 int blocksize, int csum_size,
2614 unsigned int parent_ino, int dotdot_real_len);
Tao Ma3c47d542012-12-10 14:05:59 -05002615extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2616 unsigned int blocksize);
2617extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2618 struct inode *inode,
2619 struct buffer_head *bh);
Tao Ma8af0f082013-04-19 17:53:09 -04002620#define S_SHIFT 12
2621static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2622 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
2623 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
2624 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
2625 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
2626 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
2627 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
2628 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
2629};
2630
2631static inline void ext4_set_de_type(struct super_block *sb,
2632 struct ext4_dir_entry_2 *de,
2633 umode_t mode) {
2634 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
2635 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2636}
2637
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002638
2639/* symlink.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002640extern const struct inode_operations ext4_symlink_inode_operations;
2641extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002642
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04002643/* block_validity */
2644extern void ext4_release_system_zone(struct super_block *sb);
2645extern int ext4_setup_system_zone(struct super_block *sb);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002646extern int __init ext4_init_system_zone(void);
2647extern void ext4_exit_system_zone(void);
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04002648extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2649 ext4_fsblk_t start_blk,
2650 unsigned int count);
Theodore Ts'o1f7d1e72011-06-27 19:16:02 -04002651extern int ext4_check_blockref(const char *, unsigned int,
2652 struct inode *, __le32 *, unsigned int);
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04002653
Alex Tomasa86c6182006-10-11 01:21:03 -07002654/* extents.c */
Theodore Ts'o4a092d72012-11-28 13:03:30 -05002655struct ext4_ext_path;
2656struct ext4_extent;
2657
Alex Tomasa86c6182006-10-11 01:21:03 -07002658extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2659extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
Jan Karafffb2732013-06-04 13:01:11 -04002660extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04002661extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2662 struct ext4_map_blocks *map, int flags);
Theodore Ts'o819c4922013-04-03 12:47:17 -04002663extern void ext4_ext_truncate(handle_t *, struct inode *);
Theodore Ts'o26a4c0c2013-04-03 12:45:17 -04002664extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2665 ext4_lblk_t end);
Alex Tomasa86c6182006-10-11 01:21:03 -07002666extern void ext4_ext_init(struct super_block *);
2667extern void ext4_ext_release(struct super_block *);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002668extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
Amit Aroraa2df2a62007-07-17 21:42:41 -04002669 loff_t len);
Jan Kara6b523df2013-06-04 13:21:11 -04002670extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
2671 loff_t offset, ssize_t len);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04002672extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2673 struct ext4_map_blocks *map, int flags);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05002674extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2675 ext4_lblk_t lblocks);
2676extern int ext4_extent_tree_init(handle_t *, struct inode *);
2677extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2678 int num,
2679 struct ext4_ext_path *path);
2680extern int ext4_can_extents_be_merged(struct inode *inode,
2681 struct ext4_extent *ex1,
2682 struct ext4_extent *ex2);
2683extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2684 struct ext4_ext_path *,
2685 struct ext4_extent *, int);
2686extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
2687 struct ext4_ext_path *);
2688extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2689extern int ext4_ext_check_inode(struct inode *inode);
Zheng Liuf7fec032013-02-18 00:28:47 -05002690extern int ext4_find_delalloc_range(struct inode *inode,
2691 ext4_lblk_t lblk_start,
2692 ext4_lblk_t lblk_end);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05002693extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05002694extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2695 __u64 start, __u64 len);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05002696
2697
Akira Fujita748de672009-06-17 19:24:03 -04002698/* move_extent.c */
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -04002699extern void ext4_double_down_write_data_sem(struct inode *first,
2700 struct inode *second);
2701extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2702 struct inode *donor_inode);
2703void ext4_inode_double_lock(struct inode *inode1, struct inode *inode2);
2704void ext4_inode_double_unlock(struct inode *inode1, struct inode *inode2);
Akira Fujita748de672009-06-17 19:24:03 -04002705extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2706 __u64 start_orig, __u64 start_donor,
2707 __u64 len, __u64 *moved_len);
2708
Theodore Ts'obd2d0212010-10-27 21:30:10 -04002709/* page-io.c */
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002710extern int __init ext4_init_pageio(void);
2711extern void ext4_exit_pageio(void);
Theodore Ts'obd2d0212010-10-27 21:30:10 -04002712extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
Jan Kara97a851e2013-06-04 11:58:58 -04002713extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2714extern int ext4_put_io_end(ext4_io_end_t *io_end);
2715extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2716extern void ext4_io_submit_init(struct ext4_io_submit *io,
2717 struct writeback_control *wbc);
Jan Kara2e8fa542013-06-04 14:21:02 -04002718extern void ext4_end_io_rsv_work(struct work_struct *work);
2719extern void ext4_end_io_unrsv_work(struct work_struct *work);
Theodore Ts'obd2d0212010-10-27 21:30:10 -04002720extern void ext4_io_submit(struct ext4_io_submit *io);
2721extern int ext4_bio_write_page(struct ext4_io_submit *io,
2722 struct page *page,
2723 int len,
2724 struct writeback_control *wbc);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05002725
Johann Lombardic5e06d12011-05-24 18:31:25 -04002726/* mmp.c */
2727extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
Darrick J. Wong5c359a42012-04-29 18:47:10 -04002728extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2729extern int ext4_mmp_csum_verify(struct super_block *sb,
2730 struct mmp_struct *mmp);
Johann Lombardic5e06d12011-05-24 18:31:25 -04002731
Jan Kara3613d222013-06-04 13:19:34 -04002732/*
2733 * Note that these flags will never ever appear in a buffer_head's state flag.
2734 * See EXT4_MAP_... to see where this is used.
2735 */
Jiaying Zhang744692d2010-03-04 16:14:02 -05002736enum ext4_state_bits {
2737 BH_Uninit /* blocks are allocated but uninitialized on disk */
Jan Kara3613d222013-06-04 13:19:34 -04002738 = BH_JBDPrivateStart,
Aditya Kali7b415bf2011-09-09 19:04:51 -04002739 BH_AllocFromCluster, /* allocated blocks were part of already
Jan Kara3613d222013-06-04 13:19:34 -04002740 * allocated cluster. */
Jiaying Zhang744692d2010-03-04 16:14:02 -05002741};
2742
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05002743/*
Adam Buchbinder48fc7f72012-09-19 21:48:00 -04002744 * Add new method to test whether block and inode bitmaps are properly
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05002745 * initialized. With uninit_bg reading the block from disk is not enough
2746 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2747 */
2748#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2749
2750static inline int bitmap_uptodate(struct buffer_head *bh)
2751{
2752 return (buffer_uptodate(bh) &&
2753 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2754}
2755static inline void set_bitmap_uptodate(struct buffer_head *bh)
2756{
2757 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2758}
2759
Dmitry Monakhov17335dc2012-09-29 00:41:21 -04002760/*
2761 * Disable DIO read nolock optimization, so new dioreaders will be forced
2762 * to grab i_mutex
2763 */
2764static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2765{
2766 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2767 smp_mb();
2768}
2769static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2770{
2771 smp_mb();
2772 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2773}
2774
Akinobu Mita731eb1a2010-03-03 23:55:01 -05002775#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2776
Eric Sandeene9e3bce2011-02-12 08:17:34 -05002777/* For ioend & aio unwritten conversion wait queues */
2778#define EXT4_WQ_HASH_SZ 37
2779#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2780 EXT4_WQ_HASH_SZ])
2781#define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2782 EXT4_WQ_HASH_SZ])
2783extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2784extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2785
Yongqiang Yang8f82f842011-07-26 21:35:44 -04002786#define EXT4_RESIZING 0
2787extern int ext4_resize_begin(struct super_block *sb);
2788extern void ext4_resize_end(struct super_block *sb);
2789
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002790#endif /* __KERNEL__ */
2791
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002792#endif /* _EXT4_H */