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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
Alex Tomasc9de5602008-01-29 00:19:52 -0500124
125struct ext4_allocation_request {
126 /* target inode for block we're allocating */
127 struct inode *inode;
Alex Tomasc9de5602008-01-29 00:19:52 -0500128 /* how many blocks we want to allocate */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500129 unsigned int len;
Eric Sandeen726447d2009-07-13 10:24:17 -0400130 /* logical block in target inode */
131 ext4_lblk_t logical;
132 /* the closest logical allocated block to the left */
133 ext4_lblk_t lleft;
134 /* the closest logical allocated block to the right */
135 ext4_lblk_t lright;
136 /* phys. target (a hint) */
137 ext4_fsblk_t goal;
138 /* phys. block for the closest logical allocated block to the left */
139 ext4_fsblk_t pleft;
140 /* phys. block for the closest logical allocated block to the right */
141 ext4_fsblk_t pright;
Alex Tomasc9de5602008-01-29 00:19:52 -0500142 /* flags. see above EXT4_MB_HINT_* */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500143 unsigned int flags;
Alex Tomasc9de5602008-01-29 00:19:52 -0500144};
145
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700146/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400147 * Logical to physical block mapping, used by ext4_map_blocks()
148 *
149 * This structure is used to pass requests into ext4_map_blocks() as
150 * well as to store the information returned by ext4_map_blocks(). It
151 * takes less room on the stack than a struct buffer_head.
152 */
153#define EXT4_MAP_NEW (1 << BH_New)
154#define EXT4_MAP_MAPPED (1 << BH_Mapped)
155#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
156#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
157#define EXT4_MAP_UNINIT (1 << BH_Uninit)
Aditya Kali7b415bf2011-09-09 19:04:51 -0400158/* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
159 * ext4_map_blocks wants to know whether or not the underlying cluster has
160 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
161 * the requested mapping was from previously mapped (or delayed allocated)
162 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
163 * should never appear on buffer_head's state flags.
164 */
165#define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400166#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
167 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
Aditya Kali7b415bf2011-09-09 19:04:51 -0400168 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400169
170struct ext4_map_blocks {
171 ext4_fsblk_t m_pblk;
172 ext4_lblk_t m_lblk;
173 unsigned int m_len;
174 unsigned int m_flags;
175};
176
177/*
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400178 * For delayed allocation tracking
179 */
180struct mpage_da_data {
181 struct inode *inode;
182 sector_t b_blocknr; /* start block number of extent */
183 size_t b_size; /* size of extent */
184 unsigned long b_state; /* state of the extent */
185 unsigned long first_page, next_page; /* extent of pages */
186 struct writeback_control *wbc;
187 int io_done;
188 int pages_written;
189 int retval;
190};
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400191
192/*
193 * Flags for ext4_io_end->flags
194 */
195#define EXT4_IO_END_UNWRITTEN 0x0001
196#define EXT4_IO_END_ERROR 0x0002
Jiaying Zhang8c0bec22011-08-31 11:50:51 -0400197#define EXT4_IO_END_QUEUED 0x0004
Jeff Moyer266991b2012-02-20 17:59:24 -0500198#define EXT4_IO_END_DIRECT 0x0008
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400199
200struct ext4_io_page {
201 struct page *p_page;
Theodore Ts'o83668e72010-11-08 13:45:33 -0500202 atomic_t p_count;
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400203};
204
205#define MAX_IO_PAGES 128
206
Curt Wohlgemuth41881882012-03-05 10:40:22 -0500207/*
208 * For converting uninitialized extents on a work queue.
209 *
210 * 'page' is only used from the writepage() path; 'pages' is only used for
211 * buffered writes; they are used to keep page references until conversion
212 * takes place. For AIO/DIO, neither field is filled in.
213 */
Mingming Cao00314622009-09-28 15:49:08 -0400214typedef struct ext4_io_end {
jiayingz@google.com (Jiaying Zhang)5b3ff232010-07-27 11:56:06 -0400215 struct list_head list; /* per-file finished IO list */
Mingming Cao00314622009-09-28 15:49:08 -0400216 struct inode *inode; /* file being written to */
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400217 unsigned int flag; /* unwritten or not */
Curt Wohlgemuth41881882012-03-05 10:40:22 -0500218 struct page *page; /* for writepage() path */
Eric Sandeena1de02d2010-02-04 23:58:38 -0500219 loff_t offset; /* offset in the file */
220 ssize_t size; /* size of the extent */
Mingming Cao00314622009-09-28 15:49:08 -0400221 struct work_struct work; /* data work queue */
jiayingz@google.com (Jiaying Zhang)5b3ff232010-07-27 11:56:06 -0400222 struct kiocb *iocb; /* iocb struct for AIO */
223 int result; /* error value for AIO */
Curt Wohlgemuth41881882012-03-05 10:40:22 -0500224 int num_io_pages; /* for writepages() */
225 struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */
Mingming Cao00314622009-09-28 15:49:08 -0400226} ext4_io_end_t;
227
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400228struct ext4_io_submit {
229 int io_op;
230 struct bio *io_bio;
231 ext4_io_end_t *io_end;
232 struct ext4_io_page *io_page;
233 sector_t io_next_block;
234};
235
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400236/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700237 * Special inodes numbers
238 */
Mingming Cao617ba132006-10-11 01:20:53 -0700239#define EXT4_BAD_INO 1 /* Bad blocks inode */
240#define EXT4_ROOT_INO 2 /* Root inode */
Aditya Kaliae812302011-05-24 19:00:39 -0400241#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
242#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
Mingming Cao617ba132006-10-11 01:20:53 -0700243#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
244#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
245#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
246#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700247
Mingming Cao617ba132006-10-11 01:20:53 -0700248/* First non-reserved inode for old ext4 filesystems */
249#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700250
251/*
252 * Maximal count of links to a file
253 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400254#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700255
256/*
257 * Macro-instructions used to manage several block sizes
258 */
Mingming Cao617ba132006-10-11 01:20:53 -0700259#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -0500260#define EXT4_MAX_BLOCK_SIZE 65536
261#define EXT4_MIN_BLOCK_LOG_SIZE 10
Curt Wohlgemuthfb1813f2010-10-27 21:29:12 -0400262#define EXT4_MAX_BLOCK_LOG_SIZE 16
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700263#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700264# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700265#else
Mingming Cao617ba132006-10-11 01:20:53 -0700266# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700267#endif
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400268#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
Theodore Ts'o281b5992011-09-09 18:34:51 -0400269#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
270 EXT4_SB(s)->s_cluster_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700271#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700272# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Theodore Ts'o281b5992011-09-09 18:34:51 -0400273# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700274#else
Mingming Cao617ba132006-10-11 01:20:53 -0700275# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700276#endif
277#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700278#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
279#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
280#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700281#else
Mingming Cao617ba132006-10-11 01:20:53 -0700282#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
283 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700284 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -0700285#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
286 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700287 (s)->s_first_ino)
288#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400289#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700290
Theodore Ts'od5b8f312011-09-09 18:44:51 -0400291/* Translate a block number to a cluster number */
292#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
293/* Translate a cluster number to a block number */
294#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
295/* Translate # of blks to # of clusters */
296#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
297 (sbi)->s_cluster_bits)
298
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700299/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700300 * Structure of a blocks group descriptor
301 */
Mingming Cao617ba132006-10-11 01:20:53 -0700302struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700303{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400304 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400305 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
306 __le32 bg_inode_table_lo; /* Inodes table block */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500307 __le16 bg_free_blocks_count_lo;/* Free blocks count */
308 __le16 bg_free_inodes_count_lo;/* Free inodes count */
309 __le16 bg_used_dirs_count_lo; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400310 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
Darrick J. Wonge6153912012-04-29 18:23:10 -0400311 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
312 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
313 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500314 __le16 bg_itable_unused_lo; /* Unused inodes count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400315 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700316 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
317 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
318 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500319 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
320 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
321 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500322 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
Darrick J. Wonge6153912012-04-29 18:23:10 -0400323 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
324 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
325 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
326 __u32 bg_reserved;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700327};
328
Darrick J. Wong41a246d2012-04-29 18:33:10 -0400329#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
330 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
331 sizeof(__le16))
332#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
333 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
334 sizeof(__le16))
335
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400336/*
337 * Structure of a flex block group info
338 */
339
340struct flex_groups {
Theodore Ts'o9f24e422009-03-04 19:09:10 -0500341 atomic_t free_inodes;
Theodore Ts'o24aaa8e2011-09-09 18:58:51 -0400342 atomic_t free_clusters;
Theodore Ts'o7d39db12009-03-04 19:31:53 -0500343 atomic_t used_dirs;
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400344};
345
Andreas Dilger717d50e2007-10-16 18:38:25 -0400346#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
347#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
348#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
349
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700350/*
351 * Macro-instructions used to manage group descriptors
352 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700353#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700354#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700355#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
356#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700357#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700358# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
Theodore Ts'o281b5992011-09-09 18:34:51 -0400359# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
Mingming Cao617ba132006-10-11 01:20:53 -0700360# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
361# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
362# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700363#else
Mingming Cao617ba132006-10-11 01:20:53 -0700364# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700365# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700366# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700367#endif
368
369/*
370 * Constants relative to the data blocks
371 */
Mingming Cao617ba132006-10-11 01:20:53 -0700372#define EXT4_NDIR_BLOCKS 12
373#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
374#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
375#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
376#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700377
378/*
379 * Inode flags
380 */
Mingming Cao617ba132006-10-11 01:20:53 -0700381#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
382#define EXT4_UNRM_FL 0x00000002 /* Undelete */
383#define EXT4_COMPR_FL 0x00000004 /* Compress file */
384#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
385#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
386#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
387#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
388#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700389/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700390#define EXT4_DIRTY_FL 0x00000100
391#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
392#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
393#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700394/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700395#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
396#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
397#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
398#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
399#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
400#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500401#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
Alex Tomasa86c6182006-10-11 01:21:03 -0700402#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Theodore Ts'of710b4b2010-01-25 03:31:32 -0500403#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500404#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
Tao Ma67cf5b02012-12-10 14:04:46 -0500405#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500406#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700407
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500408#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
409#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700410
Duane Griffin8fa43a82009-02-15 18:57:26 -0500411/* Flags that should be inherited by new inodes from their parent. */
412#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
Theodore Ts'o1cd9f092011-08-31 11:54:51 -0400413 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
Duane Griffin8fa43a82009-02-15 18:57:26 -0500414 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
415 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
416
Duane Griffin2dc6b0d2009-02-15 18:09:20 -0500417/* Flags that are appropriate for regular files (all but dir-specific ones). */
418#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
419
420/* Flags that are appropriate for non-directories/regular files. */
421#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
422
423/* Mask out flags that are inappropriate for the given type of inode. */
424static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
425{
426 if (S_ISDIR(mode))
427 return flags;
428 else if (S_ISREG(mode))
429 return flags & EXT4_REG_FLMASK;
430 else
431 return flags & EXT4_OTHER_FLMASK;
432}
433
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400434/*
435 * Inode flags used for atomic set/get
436 */
437enum {
438 EXT4_INODE_SECRM = 0, /* Secure deletion */
439 EXT4_INODE_UNRM = 1, /* Undelete */
440 EXT4_INODE_COMPR = 2, /* Compress file */
441 EXT4_INODE_SYNC = 3, /* Synchronous updates */
442 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
443 EXT4_INODE_APPEND = 5, /* writes to file may only append */
444 EXT4_INODE_NODUMP = 6, /* do not dump file */
445 EXT4_INODE_NOATIME = 7, /* do not update atime */
446/* Reserved for compression usage... */
447 EXT4_INODE_DIRTY = 8,
448 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
449 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
450 EXT4_INODE_ECOMPR = 11, /* Compression error */
451/* End compression flags --- maybe not all used */
452 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
453 EXT4_INODE_IMAGIC = 13, /* AFS directory */
454 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
455 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
456 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
457 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
458 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
459 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
460 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
461 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
Tao Ma67cf5b02012-12-10 14:04:46 -0500462 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400463 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
464};
465
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400466/*
Carlos Maiolino9a4c8012012-12-10 16:30:45 -0500467 * Since it's pretty easy to mix up bit numbers and hex values, we use a
468 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
469 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
470 * any extra space in the compiled kernel image, otherwise, the build will fail.
471 * It's important that these values are the same, since we are using
472 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
473 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
474 * values found in ext2, ext3 and ext4 filesystems, and of course the values
475 * defined in e2fsprogs.
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400476 *
477 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
478 */
Carlos Maiolino9a4c8012012-12-10 16:30:45 -0500479#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
480#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
481
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400482static inline void ext4_check_flag_values(void)
483{
484 CHECK_FLAG_VALUE(SECRM);
485 CHECK_FLAG_VALUE(UNRM);
486 CHECK_FLAG_VALUE(COMPR);
487 CHECK_FLAG_VALUE(SYNC);
488 CHECK_FLAG_VALUE(IMMUTABLE);
489 CHECK_FLAG_VALUE(APPEND);
490 CHECK_FLAG_VALUE(NODUMP);
491 CHECK_FLAG_VALUE(NOATIME);
492 CHECK_FLAG_VALUE(DIRTY);
493 CHECK_FLAG_VALUE(COMPRBLK);
494 CHECK_FLAG_VALUE(NOCOMPR);
495 CHECK_FLAG_VALUE(ECOMPR);
496 CHECK_FLAG_VALUE(INDEX);
497 CHECK_FLAG_VALUE(IMAGIC);
498 CHECK_FLAG_VALUE(JOURNAL_DATA);
499 CHECK_FLAG_VALUE(NOTAIL);
500 CHECK_FLAG_VALUE(DIRSYNC);
501 CHECK_FLAG_VALUE(TOPDIR);
502 CHECK_FLAG_VALUE(HUGE_FILE);
503 CHECK_FLAG_VALUE(EXTENTS);
504 CHECK_FLAG_VALUE(EA_INODE);
505 CHECK_FLAG_VALUE(EOFBLOCKS);
Tao Ma67cf5b02012-12-10 14:04:46 -0500506 CHECK_FLAG_VALUE(INLINE_DATA);
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400507 CHECK_FLAG_VALUE(RESERVED);
508}
509
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700510/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700511struct ext4_new_group_input {
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400512 __u32 group; /* Group number for this data */
513 __u64 block_bitmap; /* Absolute block number of block bitmap */
514 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
515 __u64 inode_table; /* Absolute block number of inode table start */
516 __u32 blocks_count; /* Total number of blocks in this group */
517 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700518 __u16 unused;
519};
520
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400521#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
522struct compat_ext4_new_group_input {
523 u32 group;
524 compat_u64 block_bitmap;
525 compat_u64 inode_bitmap;
526 compat_u64 inode_table;
527 u32 blocks_count;
528 u16 reserved_blocks;
529 u16 unused;
530};
531#endif
532
Mingming Cao617ba132006-10-11 01:20:53 -0700533/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
534struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700535 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700536 __u64 block_bitmap;
537 __u64 inode_bitmap;
538 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700539 __u32 blocks_count;
540 __u16 reserved_blocks;
541 __u16 unused;
542 __u32 free_blocks_count;
543};
544
Yongqiang Yang33afdcc2012-01-03 23:32:52 -0500545/* Indexes used to index group tables in ext4_new_group_data */
546enum {
547 BLOCK_BITMAP = 0, /* block bitmap */
548 INODE_BITMAP, /* inode bitmap */
549 INODE_TABLE, /* inode tables */
550 GROUP_TABLE_COUNT,
551};
552
Amit Aroraa2df2a62007-07-17 21:42:41 -0400553/*
Eric Sandeen79e83032010-07-27 11:56:07 -0400554 * Flags used by ext4_map_blocks()
Amit Aroraa2df2a62007-07-17 21:42:41 -0400555 */
Theodore Ts'oc2177052009-05-14 00:58:52 -0400556 /* Allocate any needed blocks and/or convert an unitialized
557 extent to be an initialized ext4 */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400558#define EXT4_GET_BLOCKS_CREATE 0x0001
Theodore Ts'oc2177052009-05-14 00:58:52 -0400559 /* Request the creation of an unitialized extent */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400560#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
Theodore Ts'oc2177052009-05-14 00:58:52 -0400561#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
562 EXT4_GET_BLOCKS_CREATE)
Theodore Ts'oc2177052009-05-14 00:58:52 -0400563 /* Caller is from the delayed allocation writeout path,
Theodore Ts'o60e66792010-05-17 07:00:00 -0400564 so set the magic i_delalloc_reserve_flag after taking the
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400565 inode allocation semaphore for */
Jan Kara03f5d8b2009-06-09 00:17:05 -0400566#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
Mingming Cao00314622009-09-28 15:49:08 -0400567 /* caller is from the direct IO path, request to creation of an
568 unitialized extents if not allocated, split the uninitialized
569 extent if blocks has been preallocated already*/
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500570#define EXT4_GET_BLOCKS_PRE_IO 0x0008
Aneesh Kumar K.V1296cc82010-01-15 01:27:59 -0500571#define EXT4_GET_BLOCKS_CONVERT 0x0010
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500572#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
Mingming Cao00314622009-09-28 15:49:08 -0400573 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500574 /* Convert extent to initialized after IO complete */
575#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
Jiaying Zhang744692d2010-03-04 16:14:02 -0500576 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
Allison Henderson55f020d2011-05-25 07:41:26 -0400577 /* Punch out blocks of an extent */
578#define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
Vivek Haldar556b27a2011-05-25 07:41:54 -0400579 /* Don't normalize allocation size (used for fallocate) */
580#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
Dmitry Monakhova4e5d882011-10-25 08:15:12 -0400581 /* Request will not result in inode size update (user for fallocate) */
582#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
Zheng Liu729f52c2012-07-09 16:29:29 -0400583 /* Do not take i_data_sem locking in ext4_map_blocks */
584#define EXT4_GET_BLOCKS_NO_LOCK 0x0100
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700585
586/*
Theodore Ts'oe6362602009-11-23 07:17:05 -0500587 * Flags used by ext4_free_blocks
588 */
589#define EXT4_FREE_BLOCKS_METADATA 0x0001
590#define EXT4_FREE_BLOCKS_FORGET 0x0002
Theodore Ts'o1f2acb62010-01-22 17:40:42 -0500591#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
Maxim Patlasov7132de72011-07-10 19:37:48 -0400592#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
Theodore Ts'o84130192011-09-09 18:50:51 -0400593#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
594#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
Theodore Ts'oe6362602009-11-23 07:17:05 -0500595
596/*
Allison Henderson4e96b2d2011-09-03 11:51:09 -0400597 * Flags used by ext4_discard_partial_page_buffers
598 */
599#define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700600
601/*
602 * ioctl commands
603 */
Mingming Cao617ba132006-10-11 01:20:53 -0700604#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
605#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
606#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
607#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
Mingming Cao617ba132006-10-11 01:20:53 -0700608#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
609#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Mingming Cao617ba132006-10-11 01:20:53 -0700610#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
611#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400612#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
613#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
614#define EXT4_IOC_MIGRATE _IO('f', 9)
Theodore Ts'occd25062009-02-26 01:04:07 -0500615 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400616 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
Theodore Ts'occd25062009-02-26 01:04:07 -0500617#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
Akira Fujita748de672009-06-17 19:24:03 -0400618#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
Yongqiang Yang19c52462012-01-04 17:09:44 -0500619#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700620
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400621#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700622/*
623 * ioctl commands in 32 bit emulation
624 */
Mingming Cao617ba132006-10-11 01:20:53 -0700625#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
626#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
627#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
628#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
629#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
630#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
631#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400632#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
Mingming Cao617ba132006-10-11 01:20:53 -0700633#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
634#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400635#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700636
Uwe Kleine-Königb5950762010-11-01 15:38:34 -0400637/* Max physical block we can address w/o extents */
Eric Sandeenfb0a3872009-09-16 14:45:10 -0400638#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
639
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700640/*
641 * Structure of an inode on the disk
642 */
Mingming Cao617ba132006-10-11 01:20:53 -0700643struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700644 __le16 i_mode; /* File mode */
645 __le16 i_uid; /* Low 16 bits of Owner Uid */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500646 __le32 i_size_lo; /* Size in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700647 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400648 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700649 __le32 i_mtime; /* Modification time */
650 __le32 i_dtime; /* Deletion Time */
651 __le16 i_gid; /* Low 16 bits of Group Id */
652 __le16 i_links_count; /* Links count */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500653 __le32 i_blocks_lo; /* Blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700654 __le32 i_flags; /* File flags */
655 union {
656 struct {
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500657 __le32 l_i_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700658 } linux1;
659 struct {
660 __u32 h_i_translator;
661 } hurd1;
662 struct {
663 __u32 m_i_reserved1;
664 } masix1;
665 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700666 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700667 __le32 i_generation; /* File version (for NFS) */
Aneesh Kumar K.V7973c0c2008-01-28 23:58:27 -0500668 __le32 i_file_acl_lo; /* File ACL */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500669 __le32 i_size_high;
Coly Lif077d0d2007-10-16 18:38:25 -0400670 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700671 union {
672 struct {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500673 __le16 l_i_blocks_high; /* were l_i_reserved1 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700674 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400675 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700676 __le16 l_i_gid_high; /* were reserved2[0] */
Darrick J. Wonge6153912012-04-29 18:23:10 -0400677 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
678 __le16 l_i_reserved;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700679 } linux2;
680 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400681 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700682 __u16 h_i_mode_high;
683 __u16 h_i_uid_high;
684 __u16 h_i_gid_high;
685 __u32 h_i_author;
686 } hurd2;
687 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400688 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700689 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700690 __u32 m_i_reserved2[2];
691 } masix2;
692 } osd2; /* OS dependent 2 */
693 __le16 i_extra_isize;
Darrick J. Wonge6153912012-04-29 18:23:10 -0400694 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400695 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
696 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
697 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
698 __le32 i_crtime; /* File Creation time */
699 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500700 __le32 i_version_hi; /* high 32 bits for 64-bit version */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700701};
702
Akira Fujita748de672009-06-17 19:24:03 -0400703struct move_extent {
704 __u32 reserved; /* should be zero */
705 __u32 donor_fd; /* donor file descriptor */
706 __u64 orig_start; /* logical start offset in block for orig */
707 __u64 donor_start; /* logical start offset in block for donor */
708 __u64 len; /* block length to be moved */
709 __u64 moved_len; /* moved block length */
710};
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700711
Kalpak Shahef7f3832007-07-18 09:15:20 -0400712#define EXT4_EPOCH_BITS 2
713#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
714#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
715
716/*
717 * Extended fields will fit into an inode if the filesystem was formatted
718 * with large inodes (-I 256 or larger) and there are not currently any EAs
719 * consuming all of the available space. For new inodes we always reserve
720 * enough space for the kernel's known extended fields, but for inodes
721 * created with an old kernel this might not have been the case. None of
722 * the extended inode fields is critical for correct filesystem operation.
723 * This macro checks if a certain field fits in the inode. Note that
724 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
725 */
726#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
727 ((offsetof(typeof(*ext4_inode), field) + \
728 sizeof((ext4_inode)->field)) \
729 <= (EXT4_GOOD_OLD_INODE_SIZE + \
730 (einode)->i_extra_isize)) \
731
732static inline __le32 ext4_encode_extra_time(struct timespec *time)
733{
734 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400735 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
736 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
Kalpak Shahef7f3832007-07-18 09:15:20 -0400737}
738
739static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
740{
741 if (sizeof(time->tv_sec) > 4)
742 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
743 << 32;
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400744 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400745}
746
747#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
748do { \
749 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
750 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
751 (raw_inode)->xtime ## _extra = \
752 ext4_encode_extra_time(&(inode)->xtime); \
753} while (0)
754
755#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
756do { \
757 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
758 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
759 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
760 (raw_inode)->xtime ## _extra = \
761 ext4_encode_extra_time(&(einode)->xtime); \
762} while (0)
763
764#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
765do { \
766 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
767 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
768 ext4_decode_extra_time(&(inode)->xtime, \
769 raw_inode->xtime ## _extra); \
Eric Sandeenaf0b44a2010-12-19 22:10:31 -0500770 else \
771 (inode)->xtime.tv_nsec = 0; \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400772} while (0)
773
774#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
775do { \
776 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
777 (einode)->xtime.tv_sec = \
778 (signed)le32_to_cpu((raw_inode)->xtime); \
779 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
780 ext4_decode_extra_time(&(einode)->xtime, \
781 raw_inode->xtime ## _extra); \
Eric Sandeenaf0b44a2010-12-19 22:10:31 -0500782 else \
783 (einode)->xtime.tv_nsec = 0; \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400784} while (0)
785
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500786#define i_disk_version osd1.linux1.l_i_version
787
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700788#if defined(__KERNEL__) || defined(__linux__)
789#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700790#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500791#define i_blocks_high osd2.linux2.l_i_blocks_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700792#define i_uid_low i_uid
793#define i_gid_low i_gid
794#define i_uid_high osd2.linux2.l_i_uid_high
795#define i_gid_high osd2.linux2.l_i_gid_high
Darrick J. Wonge6153912012-04-29 18:23:10 -0400796#define i_checksum_lo osd2.linux2.l_i_checksum_lo
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700797
798#elif defined(__GNU__)
799
800#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700801#define i_uid_high osd2.hurd2.h_i_uid_high
802#define i_gid_high osd2.hurd2.h_i_gid_high
803#define i_author osd2.hurd2.h_i_author
804
805#elif defined(__masix__)
806
807#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700808#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700809#define i_reserved2 osd2.masix2.m_i_reserved2
810
811#endif /* defined(__KERNEL__) || defined(__linux__) */
812
813/*
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400814 * storage for cached extent
Theodore Ts'ob05e6ae2011-01-10 12:13:26 -0500815 * If ec_len == 0, then the cache is invalid.
816 * If ec_start == 0, then the cache represents a gap (null mapping)
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400817 */
818struct ext4_ext_cache {
819 ext4_fsblk_t ec_start;
820 ext4_lblk_t ec_block;
821 __u32 ec_len; /* must be 32bit to return holes */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400822};
823
Zheng Liuc0677e62012-11-08 15:18:54 -0500824#include "extents_status.h"
825
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400826/*
827 * fourth extended file system inode data in memory
828 */
829struct ext4_inode_info {
830 __le32 i_data[15]; /* unconverted */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400831 __u32 i_dtime;
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400832 ext4_fsblk_t i_file_acl;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400833
834 /*
835 * i_block_group is the number of the block group which contains
836 * this file's inode. Constant across the lifetime of the inode,
837 * it is ued for making block allocation decisions - we try to
838 * place a file's data blocks near its inode block, and new inodes
839 * near to their parent directory's inode.
840 */
841 ext4_group_t i_block_group;
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500842 ext4_lblk_t i_dir_start_lookup;
Theodore Ts'o353eb832011-01-10 12:18:25 -0500843#if (BITS_PER_LONG < 64)
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500844 unsigned long i_state_flags; /* Dynamic state flags */
Theodore Ts'o353eb832011-01-10 12:18:25 -0500845#endif
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400846 unsigned long i_flags;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400847
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400848 /*
849 * Extended attributes can be read independently of the main file
850 * data. Taking i_mutex even when reading would cause contention
851 * between readers of EAs and writers of regular file data, so
852 * instead we synchronize on xattr_sem when reading or changing
853 * EAs.
854 */
855 struct rw_semaphore xattr_sem;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400856
857 struct list_head i_orphan; /* unlinked but open inodes */
858
859 /*
860 * i_disksize keeps track of what the inode size is ON DISK, not
861 * in memory. During truncate, i_size is set to the new size by
862 * the VFS prior to calling ext4_truncate(), but the filesystem won't
863 * set i_disksize to 0 until the truncate is actually under way.
864 *
865 * The intent is that i_disksize always represents the blocks which
866 * are used by this file. This allows recovery to restart truncate
867 * on orphans if we crash during truncate. We actually write i_disksize
868 * into the on-disk inode when writing inodes out, instead of i_size.
869 *
870 * The only time when i_disksize and i_size may be different is when
871 * a truncate is in progress. The only things which change i_disksize
872 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
873 */
874 loff_t i_disksize;
875
876 /*
877 * i_data_sem is for serialising ext4_truncate() against
878 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
879 * data tree are chopped off during truncate. We can't do that in
880 * ext4 because whenever we perform intermediate commits during
881 * truncate, the inode and all the metadata blocks *must* be in a
882 * consistent state which allows truncation of the orphans to restart
883 * during recovery. Hence we must fix the get_block-vs-truncate race
884 * by other means, so we have i_data_sem.
885 */
886 struct rw_semaphore i_data_sem;
887 struct inode vfs_inode;
Theodore Ts'o8aefcd52011-01-10 12:29:43 -0500888 struct jbd2_inode *jinode;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400889
890 struct ext4_ext_cache i_cached_extent;
891 /*
892 * File creation time. Its function is same as that of
893 * struct timespec i_{a,c,m}time in the generic inode.
894 */
895 struct timespec i_crtime;
896
897 /* mballoc */
898 struct list_head i_prealloc_list;
899 spinlock_t i_prealloc_lock;
900
Zheng Liuc0677e62012-11-08 15:18:54 -0500901 /* extents status tree */
902 struct ext4_es_tree i_es_tree;
903 rwlock_t i_es_lock;
904
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400905 /* ialloc */
906 ext4_group_t i_last_alloc_group;
907
908 /* allocation reservation info for delalloc */
Theodore Ts'o57042652011-09-09 18:56:51 -0400909 /* In case of bigalloc, these refer to clusters rather than blocks */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400910 unsigned int i_reserved_data_blocks;
911 unsigned int i_reserved_meta_blocks;
912 unsigned int i_allocated_meta_blocks;
Theodore Ts'o01f49d02011-01-10 12:13:03 -0500913 ext4_lblk_t i_da_metadata_calc_last_lblock;
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500914 int i_da_metadata_calc_len;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400915
916 /* on-disk additional length */
917 __u16 i_extra_isize;
918
Tao Ma67cf5b02012-12-10 14:04:46 -0500919 /* Indicate the inline data space. */
920 u16 i_inline_off;
921 u16 i_inline_size;
922
Dmitry Monakhova9e7f442009-12-14 15:21:14 +0300923#ifdef CONFIG_QUOTA
924 /* quota space reservation, managed internally by quota code */
925 qsize_t i_reserved_quota;
926#endif
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400927
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500928 /* completed IOs that might need unwritten extents handling */
929 struct list_head i_completed_io_list;
Jiaying Zhang744692d2010-03-04 16:14:02 -0500930 spinlock_t i_completed_io_lock;
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500931 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
Dmitry Monakhove27f41e2012-09-28 23:24:52 -0400932 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500933
934 spinlock_t i_block_reservation_lock;
Jan Karab436b9b2009-12-08 23:51:10 -0500935
936 /*
937 * Transactions that contain inode's metadata needed to complete
938 * fsync and fdatasync, respectively.
939 */
940 tid_t i_sync_tid;
941 tid_t i_datasync_tid;
Darrick J. Wong814525f2012-04-29 18:31:10 -0400942
943 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
944 __u32 i_csum_seed;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400945};
946
947/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700948 * File system states
949 */
Mingming Cao617ba132006-10-11 01:20:53 -0700950#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
951#define EXT4_ERROR_FS 0x0002 /* Errors detected */
952#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700953
954/*
Theodore Tso469108f2008-02-10 01:11:44 -0500955 * Misc. filesystem flags
956 */
957#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
958#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
959#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
960
961/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700962 * Mount flags
963 */
Mingming Cao617ba132006-10-11 01:20:53 -0700964#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
965#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
966#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
967#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
968#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
Theodore Ts'o39ef17f2012-03-03 17:56:23 -0500969#define EXT4_MOUNT_ERRORS_MASK 0x00070
Mingming Cao617ba132006-10-11 01:20:53 -0700970#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
971#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
Mingming Cao617ba132006-10-11 01:20:53 -0700972#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
973#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
974#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
975#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
976#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
977#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
978#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
979#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
Theodore Ts'oafd46722009-03-16 23:12:23 -0400980#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
Mingming Cao617ba132006-10-11 01:20:53 -0700981#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
Mingming Cao617ba132006-10-11 01:20:53 -0700982#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
983#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
984#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Jiaying Zhang744692d2010-03-04 16:14:02 -0500985#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
Linus Torvaldsd4da6c92009-11-02 10:15:27 -0800986#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500987#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
Theodore Ts'o14490322010-12-14 15:27:50 -0500988#define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
Alex Tomas64769242008-07-11 19:27:31 -0400989#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400990#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400991#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
Eric Sandeen5328e632009-11-19 14:25:42 -0500992#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
Lukas Czernerbfff6872010-10-27 21:30:05 -0400993#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400994
Theodore Ts'o56889782011-09-03 18:22:38 -0400995#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
996 specified delalloc */
997
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -0500998#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
999 ~EXT4_MOUNT_##opt
1000#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1001 EXT4_MOUNT_##opt
Mingming Cao617ba132006-10-11 01:20:53 -07001002#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1003 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001004
Theodore Ts'oa2595b82010-12-15 20:30:48 -05001005#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1006 ~EXT4_MOUNT2_##opt
1007#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1008 EXT4_MOUNT2_##opt
1009#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1010 EXT4_MOUNT2_##opt)
1011
Akinobu Mita597d5082011-12-28 20:32:07 -05001012#define ext4_test_and_set_bit __test_and_set_bit_le
1013#define ext4_set_bit __set_bit_le
Mingming Cao617ba132006-10-11 01:20:53 -07001014#define ext4_set_bit_atomic ext2_set_bit_atomic
Akinobu Mita597d5082011-12-28 20:32:07 -05001015#define ext4_test_and_clear_bit __test_and_clear_bit_le
1016#define ext4_clear_bit __clear_bit_le
Mingming Cao617ba132006-10-11 01:20:53 -07001017#define ext4_clear_bit_atomic ext2_clear_bit_atomic
Akinobu Mita50e01682011-03-23 16:42:07 -07001018#define ext4_test_bit test_bit_le
Akinobu Mita50e01682011-03-23 16:42:07 -07001019#define ext4_find_next_zero_bit find_next_zero_bit_le
1020#define ext4_find_next_bit find_next_bit_le
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001021
Yongqiang Yangc3e94d12011-07-26 22:05:53 -04001022extern void ext4_set_bits(void *bm, int cur, int len);
1023
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001024/*
1025 * Maximal mount counts between two filesystem checks
1026 */
Mingming Cao617ba132006-10-11 01:20:53 -07001027#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1028#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001029
1030/*
1031 * Behaviour when detecting errors
1032 */
Mingming Cao617ba132006-10-11 01:20:53 -07001033#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1034#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1035#define EXT4_ERRORS_PANIC 3 /* Panic */
1036#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001037
Darrick J. Wonge6153912012-04-29 18:23:10 -04001038/* Metadata checksum algorithm codes */
1039#define EXT4_CRC32C_CHKSUM 1
1040
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001041/*
1042 * Structure of the super block
1043 */
Mingming Cao617ba132006-10-11 01:20:53 -07001044struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001045/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001046 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001047 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1048 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001049/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1050 __le32 s_first_data_block; /* First Data Block */
1051 __le32 s_log_block_size; /* Block size */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001052 __le32 s_log_cluster_size; /* Allocation cluster size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001053/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001054 __le32 s_clusters_per_group; /* # Clusters per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001055 __le32 s_inodes_per_group; /* # Inodes per group */
1056 __le32 s_mtime; /* Mount time */
1057/*30*/ __le32 s_wtime; /* Write time */
1058 __le16 s_mnt_count; /* Mount count */
1059 __le16 s_max_mnt_count; /* Maximal mount count */
1060 __le16 s_magic; /* Magic signature */
1061 __le16 s_state; /* File system state */
1062 __le16 s_errors; /* Behaviour when detecting errors */
1063 __le16 s_minor_rev_level; /* minor revision level */
1064/*40*/ __le32 s_lastcheck; /* time of last check */
1065 __le32 s_checkinterval; /* max. time between checks */
1066 __le32 s_creator_os; /* OS */
1067 __le32 s_rev_level; /* Revision level */
1068/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1069 __le16 s_def_resgid; /* Default gid for reserved blocks */
1070 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001071 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001072 *
1073 * Note: the difference between the compatible feature set and
1074 * the incompatible feature set is that if there is a bit set
1075 * in the incompatible feature set that the kernel doesn't
1076 * know about, it should refuse to mount the filesystem.
1077 *
1078 * e2fsck's requirements are more strict; if it doesn't know
1079 * about a feature in either the compatible or incompatible
1080 * feature set, it must abort and not try to meddle with
1081 * things it doesn't understand...
1082 */
1083 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001084 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001085 __le16 s_block_group_nr; /* block group # of this superblock */
1086 __le32 s_feature_compat; /* compatible feature set */
1087/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1088 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1089/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1090/*78*/ char s_volume_name[16]; /* volume name */
1091/*88*/ char s_last_mounted[64]; /* directory where last mounted */
1092/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1093 /*
1094 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -07001095 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001096 */
1097 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1098 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1099 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1100 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001101 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001102 */
1103/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1104/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1105 __le32 s_journal_dev; /* device number of journal file */
1106 __le32 s_last_orphan; /* start of list of inodes to delete */
1107 __le32 s_hash_seed[4]; /* HTREE hash seed */
1108 __u8 s_def_hash_version; /* Default hash version to use */
Theodore Ts'o89eeddf2010-07-27 11:56:04 -04001109 __u8 s_jnl_backup_type;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001110 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001111/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001112 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001113 __le32 s_mkfs_time; /* When the filesystem was created */
1114 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1115 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1116/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1117 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1118 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -04001119 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1120 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1121 __le32 s_flags; /* Miscellaneous flags */
1122 __le16 s_raid_stride; /* RAID stride */
Johann Lombardic5e06d12011-05-24 18:31:25 -04001123 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -04001124 __le64 s_mmp_block; /* Block for multi-mount protection */
1125 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001126 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
Darrick J. Wonge6153912012-04-29 18:23:10 -04001127 __u8 s_checksum_type; /* metadata checksum algorithm used */
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001128 __le16 s_reserved_pad;
Theodore Ts'oafc32f72009-02-28 19:39:58 -05001129 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
Theodore Ts'o4a9cdec2010-06-29 11:00:23 -04001130 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1131 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1132 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1133 snapshot's future use */
1134 __le32 s_snapshot_list; /* inode number of the head of the
1135 on-disk snapshot list */
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04001136#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1137 __le32 s_error_count; /* number of fs errors */
1138 __le32 s_first_error_time; /* first time an error happened */
1139 __le32 s_first_error_ino; /* inode involved in first error */
1140 __le64 s_first_error_block; /* block involved of first error */
1141 __u8 s_first_error_func[32]; /* function where the error happened */
1142 __le32 s_first_error_line; /* line number where error happened */
1143 __le32 s_last_error_time; /* most recent time of an error */
1144 __le32 s_last_error_ino; /* inode involved in last error */
1145 __le32 s_last_error_line; /* line number where error happened */
1146 __le64 s_last_error_block; /* block involved of last error */
1147 __u8 s_last_error_func[32]; /* function where the error happened */
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001148#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1149 __u8 s_mount_opts[64];
Theodore Ts'o281b5992011-09-09 18:34:51 -04001150 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1151 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1152 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
Darrick J. Wonge6153912012-04-29 18:23:10 -04001153 __le32 s_reserved[108]; /* Padding to the end of the block */
1154 __le32 s_checksum; /* crc32c(superblock) */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001155};
1156
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04001157#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1158
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001159#ifdef __KERNEL__
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001160
1161/*
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001162 * run-time mount flags
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001163 */
1164#define EXT4_MF_MNTDIR_SAMPLED 0x0001
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001165#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001166
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001167/*
1168 * fourth extended-fs super-block data in memory
1169 */
1170struct ext4_sb_info {
1171 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1172 unsigned long s_inodes_per_block;/* Number of inodes per block */
1173 unsigned long s_blocks_per_group;/* Number of blocks in a group */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001174 unsigned long s_clusters_per_group; /* Number of clusters in a group */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001175 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1176 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1177 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1178 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1179 ext4_group_t s_groups_count; /* Number of groups in the fs */
Eric Sandeenfb0a3872009-09-16 14:45:10 -04001180 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
Theodore Ts'o952fc182012-07-09 16:27:05 -04001181 unsigned long s_overhead; /* # of fs overhead clusters */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001182 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1183 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001184 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1185 struct buffer_head * s_sbh; /* Buffer containing the super block */
1186 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1187 struct buffer_head **s_group_desc;
Theodore Ts'o7f4520c2009-06-13 10:09:41 -04001188 unsigned int s_mount_opt;
Theodore Ts'oa2595b82010-12-15 20:30:48 -05001189 unsigned int s_mount_opt2;
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001190 unsigned int s_mount_flags;
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001191 unsigned int s_def_mount_opt;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001192 ext4_fsblk_t s_sb_block;
Eric W. Biederman08cefc72012-02-07 15:41:49 -08001193 kuid_t s_resuid;
1194 kgid_t s_resgid;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001195 unsigned short s_mount_state;
1196 unsigned short s_pad;
1197 int s_addr_per_block_bits;
1198 int s_desc_per_block_bits;
1199 int s_inode_size;
1200 int s_first_ino;
1201 unsigned int s_inode_readahead_blks;
Andreas Dilger11013912009-06-13 11:45:35 -04001202 unsigned int s_inode_goal;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001203 spinlock_t s_next_gen_lock;
1204 u32 s_next_generation;
1205 u32 s_hash_seed[4];
1206 int s_def_hash_version;
1207 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
Theodore Ts'o57042652011-09-09 18:56:51 -04001208 struct percpu_counter s_freeclusters_counter;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001209 struct percpu_counter s_freeinodes_counter;
1210 struct percpu_counter s_dirs_counter;
Theodore Ts'o57042652011-09-09 18:56:51 -04001211 struct percpu_counter s_dirtyclusters_counter;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001212 struct blockgroup_lock *s_blockgroup_lock;
1213 struct proc_dir_entry *s_proc;
1214 struct kobject s_kobj;
1215 struct completion s_kobj_unregister;
Theodore Ts'o2c0544b2012-05-30 22:56:46 -04001216 struct super_block *s_sb;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001217
1218 /* Journaling */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001219 struct journal_s *s_journal;
1220 struct list_head s_orphan;
1221 struct mutex s_orphan_lock;
Yongqiang Yang8f82f842011-07-26 21:35:44 -04001222 unsigned long s_resize_flags; /* Flags indicating if there
1223 is a resizer */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001224 unsigned long s_commit_interval;
1225 u32 s_max_batch_time;
1226 u32 s_min_batch_time;
1227 struct block_device *journal_bdev;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001228#ifdef CONFIG_QUOTA
1229 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1230 int s_jquota_fmt; /* Format of quota to use */
1231#endif
1232 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001233 struct rb_root system_blks;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001234
1235#ifdef EXTENTS_STATS
1236 /* ext4 extents stats */
1237 unsigned long s_ext_min;
1238 unsigned long s_ext_max;
1239 unsigned long s_depth_max;
1240 spinlock_t s_ext_stats_lock;
1241 unsigned long s_ext_blocks;
1242 unsigned long s_ext_extents;
1243#endif
1244
1245 /* for buddy allocator */
1246 struct ext4_group_info ***s_group_info;
1247 struct inode *s_buddy_cache;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001248 spinlock_t s_md_lock;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001249 unsigned short *s_mb_offsets;
1250 unsigned int *s_mb_maxs;
Theodore Ts'o28623c22012-09-05 01:31:50 -04001251 unsigned int s_group_info_size;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001252
1253 /* tunables */
1254 unsigned long s_stripe;
1255 unsigned int s_mb_stream_request;
1256 unsigned int s_mb_max_to_scan;
1257 unsigned int s_mb_min_to_scan;
1258 unsigned int s_mb_stats;
1259 unsigned int s_mb_order2_reqs;
1260 unsigned int s_mb_group_prealloc;
Theodore Ts'o55138e02009-09-29 13:31:31 -04001261 unsigned int s_max_writeback_mb_bump;
Theodore Ts'odf981d02012-08-17 09:48:17 -04001262 unsigned int s_max_dir_size_kb;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001263 /* where last allocation was done - for stream allocation */
1264 unsigned long s_mb_last_group;
1265 unsigned long s_mb_last_start;
1266
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001267 /* stats for buddy allocator */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001268 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1269 atomic_t s_bal_success; /* we found long enough chunks */
1270 atomic_t s_bal_allocated; /* in blocks */
1271 atomic_t s_bal_ex_scanned; /* total extents scanned */
1272 atomic_t s_bal_goals; /* goal hits */
1273 atomic_t s_bal_breaks; /* too long searches */
1274 atomic_t s_bal_2orders; /* 2^order hits */
1275 spinlock_t s_bal_lock;
1276 unsigned long s_mb_buddies_generated;
1277 unsigned long long s_mb_generation_time;
1278 atomic_t s_mb_lost_chunks;
1279 atomic_t s_mb_preallocated;
1280 atomic_t s_mb_discarded;
Theodore Ts'o50797482009-09-18 13:34:02 -04001281 atomic_t s_lock_busy;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001282
1283 /* locality groups */
Tejun Heo003cb602010-02-02 14:39:01 +09001284 struct ext4_locality_group __percpu *s_locality_groups;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001285
1286 /* for write statistics */
1287 unsigned long s_sectors_written_start;
1288 u64 s_kbytes_written;
1289
Zheng Liu67a5da52012-08-17 09:54:17 -04001290 /* the size of zero-out chunk */
1291 unsigned int s_extent_max_zeroout_kb;
1292
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001293 unsigned int s_log_groups_per_flex;
1294 struct flex_groups *s_flex_groups;
Theodore Ts'o117fff12012-09-05 01:29:50 -04001295 ext4_group_t s_flex_groups_allocated;
Mingming Cao4c0425f2009-09-28 15:48:41 -04001296
1297 /* workqueue for dio unwritten */
1298 struct workqueue_struct *dio_unwritten_wq;
Theodore Ts'o66e61a92010-07-27 11:56:04 -04001299
1300 /* timer for periodic error stats printing */
1301 struct timer_list s_err_report;
Lukas Czernerbfff6872010-10-27 21:30:05 -04001302
1303 /* Lazy inode table initialization info */
1304 struct ext4_li_request *s_li_request;
1305 /* Wait multiplier for lazy initialization thread */
1306 unsigned int s_li_wait_mult;
Johann Lombardic5e06d12011-05-24 18:31:25 -04001307
1308 /* Kernel thread for multiple mount protection */
1309 struct task_struct *s_mmp_tsk;
Tao Ma3d56b8d2011-07-11 00:03:38 -04001310
1311 /* record the last minlen when FITRIM is called. */
1312 atomic_t s_last_trim_minblks;
Darrick J. Wong04419842012-04-29 18:27:10 -04001313
1314 /* Reference to checksum algorithm driver via cryptoapi */
1315 struct crypto_shash *s_chksum_driver;
Darrick J. Wonga9c473172012-04-29 18:29:10 -04001316
1317 /* Precomputed FS UUID checksum for seeding other checksums */
1318 __u32 s_csum_seed;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001319};
1320
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001321static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001322{
1323 return sb->s_fs_info;
1324}
Mingming Cao617ba132006-10-11 01:20:53 -07001325static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001326{
Mingming Cao617ba132006-10-11 01:20:53 -07001327 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001328}
1329
Kalpak Shahef7f3832007-07-18 09:15:20 -04001330static inline struct timespec ext4_current_time(struct inode *inode)
1331{
1332 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1333 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1334}
1335
Mingming Cao617ba132006-10-11 01:20:53 -07001336static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001337{
Mingming Cao617ba132006-10-11 01:20:53 -07001338 return ino == EXT4_ROOT_INO ||
Aditya Kali7c319d32012-07-22 20:21:31 -04001339 ino == EXT4_USR_QUOTA_INO ||
1340 ino == EXT4_GRP_QUOTA_INO ||
Mingming Cao617ba132006-10-11 01:20:53 -07001341 ino == EXT4_JOURNAL_INO ||
1342 ino == EXT4_RESIZE_INO ||
1343 (ino >= EXT4_FIRST_INO(sb) &&
1344 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001345}
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001346
Tao Ma0edeb712011-10-31 17:30:44 -04001347static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1348 struct ext4_io_end *io_end)
1349{
1350 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1351 io_end->flag |= EXT4_IO_END_UNWRITTEN;
Dmitry Monakhove27f41e2012-09-28 23:24:52 -04001352 atomic_inc(&EXT4_I(inode)->i_unwritten);
Tao Ma0edeb712011-10-31 17:30:44 -04001353 }
1354}
1355
Dmitry Monakhovf45ee3a2012-09-28 23:21:09 -04001356static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1357{
1358 return inode->i_private;
1359}
1360
1361static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1362{
1363 inode->i_private = io;
1364}
1365
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001366/*
1367 * Inode dynamic state flags
1368 */
1369enum {
1370 EXT4_STATE_JDATA, /* journaled data exists */
1371 EXT4_STATE_NEW, /* inode is newly created */
1372 EXT4_STATE_XATTR, /* has in-inode xattrs */
1373 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1374 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1375 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1376 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
Frank Mayhar14ece102010-05-17 08:00:00 -04001377 EXT4_STATE_NEWENTRY, /* File just added to dir */
Theodore Ts'of2321092011-01-10 12:12:36 -05001378 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
Dmitry Monakhov17335dc2012-09-29 00:41:21 -04001379 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1380 nolocking */
Tao Ma67cf5b02012-12-10 14:04:46 -05001381 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001382};
1383
Theodore Ts'o353eb832011-01-10 12:18:25 -05001384#define EXT4_INODE_BIT_FNS(name, field, offset) \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001385static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1386{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001387 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001388} \
1389static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1390{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001391 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001392} \
1393static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1394{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001395 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001396}
1397
Theodore Ts'o353eb832011-01-10 12:18:25 -05001398EXT4_INODE_BIT_FNS(flag, flags, 0)
1399#if (BITS_PER_LONG < 64)
1400EXT4_INODE_BIT_FNS(state, state_flags, 0)
1401
1402static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1403{
1404 (ei)->i_state_flags = 0;
1405}
1406#else
1407EXT4_INODE_BIT_FNS(state, flags, 32)
1408
1409static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1410{
1411 /* We depend on the fact that callers will set i_flags */
1412}
1413#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001414#else
Mingming Cao617ba132006-10-11 01:20:53 -07001415/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001416 * a kernel struct super_block. This will allow us to call the feature-test
1417 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -07001418#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001419#endif
1420
Mingming Cao617ba132006-10-11 01:20:53 -07001421#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001422
1423/*
1424 * Codes for operating systems
1425 */
Mingming Cao617ba132006-10-11 01:20:53 -07001426#define EXT4_OS_LINUX 0
1427#define EXT4_OS_HURD 1
1428#define EXT4_OS_MASIX 2
1429#define EXT4_OS_FREEBSD 3
1430#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001431
1432/*
1433 * Revision levels
1434 */
Mingming Cao617ba132006-10-11 01:20:53 -07001435#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1436#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001437
Mingming Cao617ba132006-10-11 01:20:53 -07001438#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1439#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001440
Mingming Cao617ba132006-10-11 01:20:53 -07001441#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001442
1443/*
1444 * Feature set definitions
1445 */
1446
Mingming Cao617ba132006-10-11 01:20:53 -07001447#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001448 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001449#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001450 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001451#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001452 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001453#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1454 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1455#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1456 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1457#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1458 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1459#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1460 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1461#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1462 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1463#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1464 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001465
Mingming Cao617ba132006-10-11 01:20:53 -07001466#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1467#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1468#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1469#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1470#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1471#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001472
Mingming Cao617ba132006-10-11 01:20:53 -07001473#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1474#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1475#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001476#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
Andreas Dilger717d50e2007-10-16 18:38:25 -04001477#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001478#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -04001479#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Aditya Kaliae812302011-05-24 19:00:39 -04001480#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
Theodore Ts'o281b5992011-09-09 18:34:51 -04001481#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
Darrick J. Wonge6153912012-04-29 18:23:10 -04001482/*
1483 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1484 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1485 * all other data structures' checksums. However, the METADATA_CSUM and
1486 * GDT_CSUM bits are mutually exclusive.
1487 */
Theodore Ts'o9b90e5e2012-01-04 22:01:53 -05001488#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001489
Mingming Cao617ba132006-10-11 01:20:53 -07001490#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1491#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1492#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1493#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1494#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -07001495#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001496#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001497#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
Jose R. Santosce421582007-10-16 18:38:25 -04001498#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Theodore Ts'of710b4b2010-01-25 03:31:32 -05001499#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1500#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
Theodore Ts'o856cbcf2012-02-20 17:53:01 -05001501#define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
Theodore Ts'o9b90e5e2012-01-04 22:01:53 -05001502#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
Tao Ma67cf5b02012-12-10 14:04:46 -05001503#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001504
Theodore Ts'o2035e772011-04-18 17:29:14 -04001505#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1506#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1507 EXT4_FEATURE_INCOMPAT_META_BG)
1508#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1509 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1510 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1511
1512#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1513#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1514 EXT4_FEATURE_INCOMPAT_RECOVER| \
1515 EXT4_FEATURE_INCOMPAT_META_BG)
1516#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1517 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1518 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1519
Mingming Cao617ba132006-10-11 01:20:53 -07001520#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1521#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1522 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -07001523 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001524 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -04001525 EXT4_FEATURE_INCOMPAT_64BIT| \
Johann Lombardic5e06d12011-05-24 18:31:25 -04001526 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
Tao Maf08225d2012-12-10 14:06:03 -05001527 EXT4_FEATURE_INCOMPAT_MMP | \
1528 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
Mingming Cao617ba132006-10-11 01:20:53 -07001529#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1530 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -04001531 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001532 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -04001533 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001534 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
Theodore Ts'o6f16b602011-09-09 19:06:51 -04001535 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
Darrick J. Wonge93376c2012-05-27 08:12:42 -04001536 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
Aditya Kali7c319d32012-07-22 20:21:31 -04001537 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1538 EXT4_FEATURE_RO_COMPAT_QUOTA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001539
1540/*
1541 * Default values for user and/or group using reserved blocks
1542 */
Mingming Cao617ba132006-10-11 01:20:53 -07001543#define EXT4_DEF_RESUID 0
1544#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001545
Theodore Ts'o240799c2008-10-09 23:53:47 -04001546#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1547
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001548/*
1549 * Default mount options
1550 */
Mingming Cao617ba132006-10-11 01:20:53 -07001551#define EXT4_DEFM_DEBUG 0x0001
1552#define EXT4_DEFM_BSDGROUPS 0x0002
1553#define EXT4_DEFM_XATTR_USER 0x0004
1554#define EXT4_DEFM_ACL 0x0008
1555#define EXT4_DEFM_UID16 0x0010
1556#define EXT4_DEFM_JMODE 0x0060
1557#define EXT4_DEFM_JMODE_DATA 0x0020
1558#define EXT4_DEFM_JMODE_ORDERED 0x0040
1559#define EXT4_DEFM_JMODE_WBACK 0x0060
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001560#define EXT4_DEFM_NOBARRIER 0x0100
1561#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1562#define EXT4_DEFM_DISCARD 0x0400
1563#define EXT4_DEFM_NODELALLOC 0x0800
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001564
1565/*
Theodore Ts'o30773842009-01-03 20:27:38 -05001566 * Default journal batch times
1567 */
1568#define EXT4_DEF_MIN_BATCH_TIME 0
1569#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1570
1571/*
Theodore Ts'oa4912122009-03-12 12:18:34 -04001572 * Minimum number of groups in a flexgroup before we separate out
1573 * directories into the first block group of a flexgroup
1574 */
1575#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1576
1577/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001578 * Structure of a directory entry
1579 */
Mingming Cao617ba132006-10-11 01:20:53 -07001580#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001581
Mingming Cao617ba132006-10-11 01:20:53 -07001582struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001583 __le32 inode; /* Inode number */
1584 __le16 rec_len; /* Directory entry length */
1585 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -07001586 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001587};
1588
1589/*
Mingming Cao617ba132006-10-11 01:20:53 -07001590 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001591 * stored in intel byte order, and the name_len field could never be
1592 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1593 * file_type field.
1594 */
Mingming Cao617ba132006-10-11 01:20:53 -07001595struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001596 __le32 inode; /* Inode number */
1597 __le16 rec_len; /* Directory entry length */
1598 __u8 name_len; /* Name length */
1599 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -07001600 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001601};
1602
1603/*
Darrick J. Wonge6153912012-04-29 18:23:10 -04001604 * This is a bogus directory entry at the end of each leaf block that
1605 * records checksums.
1606 */
1607struct ext4_dir_entry_tail {
1608 __le32 det_reserved_zero1; /* Pretend to be unused */
1609 __le16 det_rec_len; /* 12 */
1610 __u8 det_reserved_zero2; /* Zero name length */
1611 __u8 det_reserved_ft; /* 0xDE, fake file type */
1612 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1613};
1614
Tao Ma3c47d542012-12-10 14:05:59 -05001615#define EXT4_DIRENT_TAIL(block, blocksize) \
1616 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1617 ((blocksize) - \
1618 sizeof(struct ext4_dir_entry_tail))))
1619
Darrick J. Wonge6153912012-04-29 18:23:10 -04001620/*
Mingming Cao617ba132006-10-11 01:20:53 -07001621 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001622 * other bits are reserved for now.
1623 */
Mingming Cao617ba132006-10-11 01:20:53 -07001624#define EXT4_FT_UNKNOWN 0
1625#define EXT4_FT_REG_FILE 1
1626#define EXT4_FT_DIR 2
1627#define EXT4_FT_CHRDEV 3
1628#define EXT4_FT_BLKDEV 4
1629#define EXT4_FT_FIFO 5
1630#define EXT4_FT_SOCK 6
1631#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001632
Mingming Cao617ba132006-10-11 01:20:53 -07001633#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001634
Darrick J. Wonge6153912012-04-29 18:23:10 -04001635#define EXT4_FT_DIR_CSUM 0xDE
1636
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001637/*
Mingming Cao617ba132006-10-11 01:20:53 -07001638 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001639 *
1640 * NOTE: It must be a multiple of 4
1641 */
Mingming Cao617ba132006-10-11 01:20:53 -07001642#define EXT4_DIR_PAD 4
1643#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1644#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1645 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -05001646#define EXT4_MAX_REC_LEN ((1<<16)-1)
1647
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001648/*
Eric Sandeen0cfc9252010-08-05 01:46:37 -04001649 * If we ever get support for fs block sizes > page_size, we'll need
1650 * to remove the #if statements in the next two functions...
1651 */
1652static inline unsigned int
1653ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1654{
1655 unsigned len = le16_to_cpu(dlen);
1656
1657#if (PAGE_CACHE_SIZE >= 65536)
1658 if (len == EXT4_MAX_REC_LEN || len == 0)
1659 return blocksize;
1660 return (len & 65532) | ((len & 3) << 16);
1661#else
1662 return len;
1663#endif
1664}
1665
1666static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1667{
1668 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1669 BUG();
1670#if (PAGE_CACHE_SIZE >= 65536)
1671 if (len < 65536)
1672 return cpu_to_le16(len);
1673 if (len == blocksize) {
1674 if (blocksize == 65536)
1675 return cpu_to_le16(EXT4_MAX_REC_LEN);
1676 else
1677 return cpu_to_le16(0);
1678 }
1679 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1680#else
1681 return cpu_to_le16(len);
1682#endif
1683}
1684
1685/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001686 * Hash Tree Directory indexing
1687 * (c) Daniel Phillips, 2001
1688 */
1689
Eric Sandeen4074fe32007-10-16 18:38:25 -04001690#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1691 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001692 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
Mingming Cao617ba132006-10-11 01:20:53 -07001693#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1694#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001695
1696/* Legal values for the dx_root hash_version field: */
1697
1698#define DX_HASH_LEGACY 0
1699#define DX_HASH_HALF_MD4 1
1700#define DX_HASH_TEA 2
Theodore Ts'of99b2582008-10-28 13:21:44 -04001701#define DX_HASH_LEGACY_UNSIGNED 3
1702#define DX_HASH_HALF_MD4_UNSIGNED 4
1703#define DX_HASH_TEA_UNSIGNED 5
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001704
Darrick J. Wong04419842012-04-29 18:27:10 -04001705static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1706 const void *address, unsigned int length)
1707{
1708 struct {
1709 struct shash_desc shash;
Theodore Ts'o3108b542012-07-22 20:25:31 -04001710 char ctx[4];
Darrick J. Wong04419842012-04-29 18:27:10 -04001711 } desc;
1712 int err;
1713
Theodore Ts'o3108b542012-07-22 20:25:31 -04001714 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1715
Darrick J. Wong04419842012-04-29 18:27:10 -04001716 desc.shash.tfm = sbi->s_chksum_driver;
1717 desc.shash.flags = 0;
1718 *(u32 *)desc.ctx = crc;
1719
1720 err = crypto_shash_update(&desc.shash, address, length);
1721 BUG_ON(err);
1722
1723 return *(u32 *)desc.ctx;
1724}
1725
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001726#ifdef __KERNEL__
1727
1728/* hash info structure used by the directory hash */
1729struct dx_hash_info
1730{
1731 u32 hash;
1732 u32 minor_hash;
1733 int hash_version;
1734 u32 *seed;
1735};
1736
Fan Yongd1f52732012-03-18 22:44:40 -04001737
1738/* 32 and 64 bit signed EOF for dx directories */
1739#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1740#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1741
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001742
1743/*
Mingming Cao617ba132006-10-11 01:20:53 -07001744 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001745 */
1746#define HASH_NB_ALWAYS 1
1747
1748
1749/*
1750 * Describe an inode's exact location on disk and in memory
1751 */
Mingming Cao617ba132006-10-11 01:20:53 -07001752struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001753{
1754 struct buffer_head *bh;
1755 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001756 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001757};
1758
Mingming Cao617ba132006-10-11 01:20:53 -07001759static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001760{
Mingming Cao617ba132006-10-11 01:20:53 -07001761 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001762}
1763
1764/*
1765 * This structure is stuffed into the struct file's private_data field
1766 * for directories. It is where we put information so that we can do
1767 * readdir operations in hash tree order.
1768 */
1769struct dir_private_info {
1770 struct rb_root root;
1771 struct rb_node *curr_node;
1772 struct fname *extra_fname;
1773 loff_t last_pos;
1774 __u32 curr_hash;
1775 __u32 curr_minor_hash;
1776 __u32 next_hash;
1777};
1778
1779/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -07001780static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001781ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001782{
Mingming Cao617ba132006-10-11 01:20:53 -07001783 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1784 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001785}
1786
1787/*
1788 * Special error return code only used by dx_probe() and its callers.
1789 */
1790#define ERR_BAD_DX_DIR -75000
1791
Andrew Morton72b64b52006-10-11 01:21:18 -07001792void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001793 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001794
1795/*
Lukas Czernerbfff6872010-10-27 21:30:05 -04001796 * Timeout and state flag for lazy initialization inode thread.
1797 */
1798#define EXT4_DEF_LI_WAIT_MULT 10
1799#define EXT4_DEF_LI_MAX_START_DELAY 5
1800#define EXT4_LAZYINIT_QUIT 0x0001
1801#define EXT4_LAZYINIT_RUNNING 0x0002
1802
1803/*
1804 * Lazy inode table initialization info
1805 */
1806struct ext4_lazy_init {
1807 unsigned long li_state;
Lukas Czernerbfff6872010-10-27 21:30:05 -04001808 struct list_head li_request_list;
1809 struct mutex li_list_mtx;
1810};
1811
1812struct ext4_li_request {
1813 struct super_block *lr_super;
1814 struct ext4_sb_info *lr_sbi;
1815 ext4_group_t lr_next_group;
1816 struct list_head lr_request;
1817 unsigned long lr_next_sched;
1818 unsigned long lr_timeout;
1819};
1820
Lukas Czerner857ac882010-10-27 21:30:05 -04001821struct ext4_features {
1822 struct kobject f_kobj;
1823 struct completion f_kobj_unregister;
1824};
1825
Lukas Czernerbfff6872010-10-27 21:30:05 -04001826/*
Johann Lombardic5e06d12011-05-24 18:31:25 -04001827 * This structure will be used for multiple mount protection. It will be
1828 * written into the block number saved in the s_mmp_block field in the
1829 * superblock. Programs that check MMP should assume that if
1830 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1831 * to use the filesystem, regardless of how old the timestamp is.
1832 */
1833#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1834#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1835#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1836#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1837
1838struct mmp_struct {
1839 __le32 mmp_magic; /* Magic number for MMP */
1840 __le32 mmp_seq; /* Sequence no. updated periodically */
1841
1842 /*
1843 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1844 * purposes and do not affect the correctness of the algorithm
1845 */
1846 __le64 mmp_time; /* Time last updated */
1847 char mmp_nodename[64]; /* Node which last updated MMP block */
1848 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1849
1850 /*
1851 * mmp_check_interval is used to verify if the MMP block has been
1852 * updated on the block device. The value is updated based on the
1853 * maximum time to write the MMP block during an update cycle.
1854 */
1855 __le16 mmp_check_interval;
1856
1857 __le16 mmp_pad1;
Darrick J. Wonge6153912012-04-29 18:23:10 -04001858 __le32 mmp_pad2[226];
1859 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
Johann Lombardic5e06d12011-05-24 18:31:25 -04001860};
1861
1862/* arguments passed to the mmp thread */
1863struct mmpd_data {
1864 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1865 struct super_block *sb; /* super block of the fs */
1866};
1867
1868/*
1869 * Check interval multiplier
1870 * The MMP block is written every update interval and initially checked every
1871 * update interval x the multiplier (the value is then adapted based on the
1872 * write latency). The reason is that writes can be delayed under load and we
1873 * don't want readers to incorrectly assume that the filesystem is no longer
1874 * in use.
1875 */
1876#define EXT4_MMP_CHECK_MULT 2UL
1877
1878/*
1879 * Minimum interval for MMP checking in seconds.
1880 */
1881#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1882
1883/*
1884 * Maximum interval for MMP checking in seconds.
1885 */
1886#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1887
1888/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001889 * Function prototypes
1890 */
1891
1892/*
1893 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -07001894 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001895 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001896# define NORET_TYPE /**/
1897# define ATTRIB_NORET __attribute__((noreturn))
1898# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001899
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001900/* bitmap.c */
Theodore Ts'of6fb99c2012-06-30 19:14:57 -04001901extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
Darrick J. Wong41a246d2012-04-29 18:33:10 -04001902void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1903 struct ext4_group_desc *gdp,
1904 struct buffer_head *bh, int sz);
1905int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1906 struct ext4_group_desc *gdp,
1907 struct buffer_head *bh, int sz);
Darrick J. Wongfa77dcf2012-04-29 18:35:10 -04001908void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1909 struct ext4_group_desc *gdp,
Tao Ma79f1ba42012-10-22 00:34:32 -04001910 struct buffer_head *bh);
Darrick J. Wongfa77dcf2012-04-29 18:35:10 -04001911int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1912 struct ext4_group_desc *gdp,
Tao Ma79f1ba42012-10-22 00:34:32 -04001913 struct buffer_head *bh);
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001914
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001915/* balloc.c */
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);
Dmitry Monakhovc2785312012-10-05 11:31:55 -04002003extern int ext4_flush_unwritten_io(struct inode *);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002004
2005/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002006extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002007 dx_hash_info *hinfo);
2008
2009/* ialloc.c */
Al Virodcca3fe2011-07-26 02:48:06 -04002010extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t,
Dmitry Monakhov5cb81da2011-10-29 09:05:00 -04002011 const struct qstr *qstr, __u32 goal,
2012 uid_t *owner);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002013extern void ext4_free_inode(handle_t *, struct inode *);
2014extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2015extern unsigned long ext4_count_free_inodes(struct super_block *);
2016extern unsigned long ext4_count_dirs(struct super_block *);
2017extern void ext4_check_inodes_bitmap(struct super_block *);
Theodore Ts'o61d08672010-10-27 21:30:15 -04002018extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002019extern int ext4_init_inode_table(struct super_block *sb,
2020 ext4_group_t group, int barrier);
Theodore Ts'o813e5722012-02-20 17:52:46 -05002021extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002022
Alex Tomasc9de5602008-01-29 00:19:52 -05002023/* mballoc.c */
2024extern long ext4_mb_stats;
2025extern long ext4_mb_max_to_scan;
Akira Fujita9d990122012-05-28 14:19:25 -04002026extern int ext4_mb_init(struct super_block *);
Alex Tomasc9de5602008-01-29 00:19:52 -05002027extern int ext4_mb_release(struct super_block *);
2028extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2029 struct ext4_allocation_request *, int *);
2030extern int ext4_mb_reserve_blocks(struct super_block *, int);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04002031extern void ext4_discard_preallocations(struct inode *);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002032extern int __init ext4_init_mballoc(void);
2033extern void ext4_exit_mballoc(void);
Theodore Ts'o44338712009-11-22 07:44:56 -05002034extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'oe6362602009-11-23 07:17:05 -05002035 struct buffer_head *bh, ext4_fsblk_t block,
2036 unsigned long count, int flags);
Theodore Ts'o28623c22012-09-05 01:31:50 -04002037extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2038 ext4_group_t ngroups);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05002039extern int ext4_mb_add_groupinfo(struct super_block *sb,
Frederic Bohe5f21b0e2008-07-11 19:27:31 -04002040 ext4_group_t i, struct ext4_group_desc *desc);
Yongqiang Yangcc7365d2011-07-26 21:46:07 -04002041extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
Amir Goldstein2846e822011-05-09 10:46:41 -04002042 ext4_fsblk_t block, unsigned long count);
Lukas Czerner7360d172010-10-27 21:30:12 -04002043extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2044
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002045/* inode.c */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002046struct buffer_head *ext4_getblk(handle_t *, struct inode *,
2047 ext4_lblk_t, int, int *);
2048struct buffer_head *ext4_bread(handle_t *, struct inode *,
2049 ext4_lblk_t, int, int *);
Tao Maf19d5872012-12-10 14:05:51 -05002050int ext4_get_block_write(struct inode *inode, sector_t iblock,
2051 struct buffer_head *bh_result, int create);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002052int ext4_get_block(struct inode *inode, sector_t iblock,
2053 struct buffer_head *bh_result, int create);
Tao Ma9c3569b2012-12-10 14:05:57 -05002054int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2055 struct buffer_head *bh, int create);
Tao Maf19d5872012-12-10 14:05:51 -05002056int ext4_walk_page_buffers(handle_t *handle,
2057 struct buffer_head *head,
2058 unsigned from,
2059 unsigned to,
2060 int *partial,
2061 int (*fn)(handle_t *handle,
2062 struct buffer_head *bh));
2063int do_journal_get_write_access(handle_t *handle,
2064 struct buffer_head *bh);
Tao Ma9c3569b2012-12-10 14:05:57 -05002065#define FALL_BACK_TO_NONDELALLOC 1
2066#define CONVERT_INLINE_DATA 2
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002067
David Howells1d1fe1e2008-02-07 00:15:37 -08002068extern struct inode *ext4_iget(struct super_block *, unsigned long);
Christoph Hellwiga9185b42010-03-05 09:21:37 +01002069extern int ext4_write_inode(struct inode *, struct writeback_control *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002070extern int ext4_setattr(struct dentry *, struct iattr *);
Mingming Cao3e3398a2008-07-11 19:27:31 -04002071extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2072 struct kstat *stat);
Al Viro0930fcc2010-06-07 13:16:22 -04002073extern void ext4_evict_inode(struct inode *);
2074extern void ext4_clear_inode(struct inode *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002075extern int ext4_sync_inode(handle_t *, struct inode *);
Christoph Hellwigaa385722011-05-27 06:53:02 -04002076extern void ext4_dirty_inode(struct inode *, int);
Mingming Cao617ba132006-10-11 01:20:53 -07002077extern int ext4_change_inode_journal_flag(struct inode *, int);
2078extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
Duane Griffin91ef4ca2008-07-11 19:27:31 -04002079extern int ext4_can_truncate(struct inode *inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002080extern void ext4_truncate(struct inode *);
Allison Hendersona4bb6b62011-05-25 07:41:50 -04002081extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
Jan Kara487caee2009-08-17 22:17:20 -04002082extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
Mingming Cao617ba132006-10-11 01:20:53 -07002083extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -04002084extern void ext4_get_inode_flags(struct ext4_inode_info *);
Theodore Ts'occd25062009-02-26 01:04:07 -05002085extern int ext4_alloc_da_blocks(struct inode *inode);
Mingming Cao617ba132006-10-11 01:20:53 -07002086extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07002087extern int ext4_writepage_trans_blocks(struct inode *);
Mingming Caof3bd1f32008-08-19 22:16:03 -04002088extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
Allison Henderson4e96b2d2011-09-03 11:51:09 -04002089extern int ext4_discard_partial_page_buffers(handle_t *handle,
2090 struct address_space *mapping, loff_t from,
2091 loff_t length, int flags);
Nick Pigginc2ec1752009-03-31 15:23:21 -07002092extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
Dmitry Monakhova9e7f442009-12-14 15:21:14 +03002093extern qsize_t *ext4_get_reserved_space(struct inode *inode);
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05002094extern void ext4_da_update_reserve_space(struct inode *inode,
2095 int used, int quota_claim);
Amir Goldsteindae1e522011-06-27 19:40:50 -04002096
2097/* indirect.c */
2098extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2099 struct ext4_map_blocks *map, int flags);
2100extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2101 const struct iovec *iov, loff_t offset,
2102 unsigned long nr_segs);
2103extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2104extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
Amir Goldsteinff9893d2011-06-27 16:36:31 -04002105extern void ext4_ind_truncate(struct inode *inode);
2106
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002107/* ioctl.c */
Andi Kleen5cdd7b22008-04-29 22:03:54 -04002108extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002109extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002110
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05002111/* migrate.c */
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -04002112extern int ext4_ext_migrate(struct inode *);
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002113
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002114/* namei.c */
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002115extern int ext4_dirent_csum_verify(struct inode *inode,
2116 struct ext4_dir_entry *dirent);
Mingming Cao617ba132006-10-11 01:20:53 -07002117extern int ext4_orphan_add(handle_t *, struct inode *);
2118extern int ext4_orphan_del(handle_t *, struct inode *);
2119extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002120 __u32 start_minor_hash, __u32 *next_hash);
Tao Ma7335cd32012-12-10 14:05:59 -05002121extern int search_dir(struct buffer_head *bh,
2122 char *search_buf,
2123 int buf_size,
2124 struct inode *dir,
2125 const struct qstr *d_name,
2126 unsigned int offset,
2127 struct ext4_dir_entry_2 **res_dir);
Tao Ma05019a92012-12-10 14:06:00 -05002128extern int ext4_generic_delete_entry(handle_t *handle,
2129 struct inode *dir,
2130 struct ext4_dir_entry_2 *de_del,
2131 struct buffer_head *bh,
2132 void *entry_buf,
2133 int buf_size,
2134 int csum_size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002135
2136/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002137extern int ext4_group_add(struct super_block *sb,
2138 struct ext4_new_group_data *input);
2139extern int ext4_group_extend(struct super_block *sb,
2140 struct ext4_super_block *es,
2141 ext4_fsblk_t n_blocks_count);
Yongqiang Yang19c52462012-01-04 17:09:44 -05002142extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002143
2144/* super.c */
Theodore Ts'o952fc182012-07-09 16:27:05 -04002145extern int ext4_calculate_overhead(struct super_block *sb);
Darrick J. Wonga9c473172012-04-29 18:29:10 -04002146extern int ext4_superblock_csum_verify(struct super_block *sb,
2147 struct ext4_super_block *es);
Theodore Ts'o06db49e2012-10-10 01:06:58 -04002148extern void ext4_superblock_csum_set(struct super_block *sb);
Theodore Ts'o9933fc02011-08-01 08:45:02 -04002149extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2150extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2151extern void ext4_kvfree(void *ptr);
Theodore Ts'o117fff12012-09-05 01:29:50 -04002152extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2153 ext4_group_t ngroup);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002154extern __printf(4, 5)
2155void __ext4_error(struct super_block *, const char *, unsigned int,
2156 const char *, ...);
Theodore Ts'oc398eda2010-07-27 11:56:40 -04002157#define ext4_error(sb, message...) __ext4_error(sb, __func__, \
2158 __LINE__, ## message)
Joe Perchesb9075fa2011-10-31 17:11:33 -07002159extern __printf(5, 6)
2160void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2161 const char *, ...);
2162extern __printf(5, 6)
2163void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2164 const char *, ...);
Theodore Ts'oc398eda2010-07-27 11:56:40 -04002165extern void __ext4_std_error(struct super_block *, const char *,
2166 unsigned int, int);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002167extern __printf(4, 5)
2168void __ext4_abort(struct super_block *, const char *, unsigned int,
2169 const char *, ...);
Theodore Ts'oc67d8592010-06-29 11:07:07 -04002170#define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
Theodore Ts'oc398eda2010-07-27 11:56:40 -04002171 __LINE__, ## message)
Joe Perchesb9075fa2011-10-31 17:11:33 -07002172extern __printf(4, 5)
2173void __ext4_warning(struct super_block *, const char *, unsigned int,
2174 const char *, ...);
Theodore Ts'oc398eda2010-07-27 11:56:40 -04002175#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
2176 __LINE__, ## message)
Joe Perchesb9075fa2011-10-31 17:11:33 -07002177extern __printf(3, 4)
2178void ext4_msg(struct super_block *, const char *, const char *, ...);
Johann Lombardic5e06d12011-05-24 18:31:25 -04002179extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2180 const char *, unsigned int, const char *);
2181#define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
2182 __LINE__, msg)
Joe Perchesb9075fa2011-10-31 17:11:33 -07002183extern __printf(7, 8)
2184void __ext4_grp_locked_error(const char *, unsigned int,
2185 struct super_block *, ext4_group_t,
2186 unsigned long, ext4_fsblk_t,
2187 const char *, ...);
Theodore Ts'oe29136f2010-06-29 12:54:28 -04002188#define ext4_grp_locked_error(sb, grp, message...) \
2189 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002190extern void ext4_update_dynamic_rev(struct super_block *sb);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -05002191extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2192 __u32 compat);
2193extern int ext4_update_rocompat_feature(handle_t *handle,
2194 struct super_block *sb, __u32 rocompat);
2195extern int ext4_update_incompat_feature(handle_t *handle,
2196 struct super_block *sb, __u32 incompat);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002197extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2198 struct ext4_group_desc *bg);
2199extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2200 struct ext4_group_desc *bg);
2201extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2202 struct ext4_group_desc *bg);
Theodore Ts'o021b65b2011-09-09 19:08:51 -04002203extern __u32 ext4_free_group_clusters(struct super_block *sb,
2204 struct ext4_group_desc *bg);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05002205extern __u32 ext4_free_inodes_count(struct super_block *sb,
2206 struct ext4_group_desc *bg);
2207extern __u32 ext4_used_dirs_count(struct super_block *sb,
2208 struct ext4_group_desc *bg);
2209extern __u32 ext4_itable_unused_count(struct super_block *sb,
2210 struct ext4_group_desc *bg);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002211extern void ext4_block_bitmap_set(struct super_block *sb,
2212 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2213extern void ext4_inode_bitmap_set(struct super_block *sb,
2214 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2215extern void ext4_inode_table_set(struct super_block *sb,
2216 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Theodore Ts'o021b65b2011-09-09 19:08:51 -04002217extern void ext4_free_group_clusters_set(struct super_block *sb,
2218 struct ext4_group_desc *bg,
2219 __u32 count);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05002220extern void ext4_free_inodes_set(struct super_block *sb,
2221 struct ext4_group_desc *bg, __u32 count);
2222extern void ext4_used_dirs_set(struct super_block *sb,
2223 struct ext4_group_desc *bg, __u32 count);
2224extern void ext4_itable_unused_set(struct super_block *sb,
2225 struct ext4_group_desc *bg, __u32 count);
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002226extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
Theodore Ts'obb23c202009-05-01 19:44:44 -04002227 struct ext4_group_desc *gdp);
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002228extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2229 struct ext4_group_desc *gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002230
Darrick J. Wong41a246d2012-04-29 18:33:10 -04002231static inline int ext4_has_group_desc_csum(struct super_block *sb)
2232{
2233 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2234 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2235 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2236}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002237
2238static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2239{
2240 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04002241 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002242}
2243
2244static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2245{
2246 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002247 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002248}
2249
2250static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2251{
2252 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002253 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002254}
2255
2256static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2257 ext4_fsblk_t blk)
2258{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04002259 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002260 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2261}
2262
2263static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2264 ext4_fsblk_t blk)
2265{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002266 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002267 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2268}
2269
2270static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2271 ext4_fsblk_t blk)
2272{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002273 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002274 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2275}
2276
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002277static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2278{
Theodore Ts'o06a279d2009-01-17 18:41:37 -05002279 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2280 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2281 le32_to_cpu(raw_inode->i_size_lo);
2282 else
2283 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002284}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002285
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002286static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2287{
2288 raw_inode->i_size_lo = cpu_to_le32(i_size);
2289 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2290}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002291
Alex Tomasc9de5602008-01-29 00:19:52 -05002292static inline
2293struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002294 ext4_group_t group)
Alex Tomasc9de5602008-01-29 00:19:52 -05002295{
2296 struct ext4_group_info ***grp_info;
2297 long indexv, indexh;
2298 grp_info = EXT4_SB(sb)->s_group_info;
2299 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2300 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2301 return grp_info[indexv][indexh];
2302}
2303
Theodore Ts'o8df96752009-05-01 08:50:38 -04002304/*
2305 * Reading s_groups_count requires using smp_rmb() afterwards. See
2306 * the locking protocol documented in the comments of ext4_group_add()
2307 * in resize.c
2308 */
2309static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2310{
2311 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2312
2313 smp_rmb();
2314 return ngroups;
2315}
Alex Tomasc9de5602008-01-29 00:19:52 -05002316
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002317static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2318 ext4_group_t block_group)
2319{
2320 return block_group >> sbi->s_log_groups_per_flex;
2321}
2322
2323static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2324{
2325 return 1 << sbi->s_log_groups_per_flex;
2326}
2327
Mingming Cao617ba132006-10-11 01:20:53 -07002328#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002329do { \
2330 if ((errno)) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -04002331 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002332} while (0)
2333
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002334#ifdef CONFIG_SMP
Theodore Ts'odf55c992011-09-09 19:16:51 -04002335/* Each CPU can accumulate percpu_counter_batch clusters in their local
2336 * counters. So we need to make sure we have free clusters more
Eric Dumazet179f7eb2009-01-06 14:41:04 -08002337 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002338 */
Theodore Ts'odf55c992011-09-09 19:16:51 -04002339#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002340#else
Theodore Ts'odf55c992011-09-09 19:16:51 -04002341#define EXT4_FREECLUSTERS_WATERMARK 0
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002342#endif
2343
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04002344static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2345{
2346 /*
2347 * XXX: replace with spinlock if seen contended -bzzz
2348 */
2349 down_write(&EXT4_I(inode)->i_data_sem);
2350 if (newsize > EXT4_I(inode)->i_disksize)
2351 EXT4_I(inode)->i_disksize = newsize;
2352 up_write(&EXT4_I(inode)->i_data_sem);
2353 return ;
2354}
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002355
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002356struct ext4_group_info {
2357 unsigned long bb_state;
2358 struct rb_root bb_free_root;
Eric Sandeena36b4492009-08-25 22:36:45 -04002359 ext4_grpblk_t bb_first_free; /* first free block */
2360 ext4_grpblk_t bb_free; /* total free blocks */
2361 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
Curt Wohlgemuth8a57d9d2010-05-16 15:00:00 -04002362 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002363 struct list_head bb_prealloc_list;
2364#ifdef DOUBLE_CHECK
2365 void *bb_bitmap;
2366#endif
2367 struct rw_semaphore alloc_sem;
Eric Sandeena36b4492009-08-25 22:36:45 -04002368 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2369 * regions, index is order.
2370 * bb_counters[3] = 5 means
2371 * 5 free 8-block regions. */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002372};
2373
Tao Ma3d56b8d2011-07-11 00:03:38 -04002374#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2375#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002376
2377#define EXT4_MB_GRP_NEED_INIT(grp) \
2378 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2379
Tao Ma3d56b8d2011-07-11 00:03:38 -04002380#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2381 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2382#define EXT4_MB_GRP_SET_TRIMMED(grp) \
2383 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2384#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2385 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2386
Theodore Ts'o50797482009-09-18 13:34:02 -04002387#define EXT4_MAX_CONTENTION 8
2388#define EXT4_CONTENTION_THRESHOLD 2
2389
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002390static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2391 ext4_group_t group)
2392{
2393 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2394}
2395
Theodore Ts'o50797482009-09-18 13:34:02 -04002396/*
2397 * Returns true if the filesystem is busy enough that attempts to
2398 * access the block group locks has run into contention.
2399 */
2400static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2401{
2402 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2403}
2404
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002405static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2406{
Theodore Ts'o50797482009-09-18 13:34:02 -04002407 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2408 if (spin_trylock(lock))
2409 /*
2410 * We're able to grab the lock right away, so drop the
2411 * lock contention counter.
2412 */
2413 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2414 else {
2415 /*
2416 * The lock is busy, so bump the contention counter,
2417 * and then wait on the spin lock.
2418 */
2419 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2420 EXT4_MAX_CONTENTION);
2421 spin_lock(lock);
2422 }
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002423}
2424
2425static inline void ext4_unlock_group(struct super_block *sb,
2426 ext4_group_t group)
2427{
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002428 spin_unlock(ext4_group_lock_ptr(sb, group));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002429}
2430
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002431/*
Theodore Ts'o1f7d1e72011-06-27 19:16:02 -04002432 * Block validity checking
2433 */
2434#define ext4_check_indirect_blockref(inode, bh) \
2435 ext4_check_blockref(__func__, __LINE__, inode, \
2436 (__le32 *)(bh)->b_data, \
2437 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2438
2439#define ext4_ind_check_inode(inode) \
2440 ext4_check_blockref(__func__, __LINE__, inode, \
2441 EXT4_I(inode)->i_data, \
2442 EXT4_NDIR_BLOCKS)
2443
2444/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002445 * Inodes and files operations
2446 */
2447
2448/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002449extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002450
2451/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002452extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07002453extern const struct file_operations ext4_file_operations;
Toshiyuki Okajimae0d10bf2010-10-27 21:30:06 -04002454extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
Dmitry Monakhovc2785312012-10-05 11:31:55 -04002455extern void ext4_unwritten_wait(struct inode *inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002456
2457/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002458extern const struct inode_operations ext4_dir_inode_operations;
2459extern const struct inode_operations ext4_special_inode_operations;
Theodore Ts'o596397b2009-05-01 13:49:15 -04002460extern struct dentry *ext4_get_parent(struct dentry *child);
Tao Maa774f9c2012-12-10 14:05:57 -05002461extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2462 struct ext4_dir_entry_2 *de,
2463 int blocksize, int csum_size,
2464 unsigned int parent_ino, int dotdot_real_len);
Tao Ma3c47d542012-12-10 14:05:59 -05002465extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2466 unsigned int blocksize);
2467extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2468 struct inode *inode,
2469 struct buffer_head *bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002470
2471/* symlink.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002472extern const struct inode_operations ext4_symlink_inode_operations;
2473extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002474
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04002475/* block_validity */
2476extern void ext4_release_system_zone(struct super_block *sb);
2477extern int ext4_setup_system_zone(struct super_block *sb);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002478extern int __init ext4_init_system_zone(void);
2479extern void ext4_exit_system_zone(void);
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04002480extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2481 ext4_fsblk_t start_blk,
2482 unsigned int count);
Theodore Ts'o1f7d1e72011-06-27 19:16:02 -04002483extern int ext4_check_blockref(const char *, unsigned int,
2484 struct inode *, __le32 *, unsigned int);
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04002485
Alex Tomasa86c6182006-10-11 01:21:03 -07002486/* extents.c */
Theodore Ts'o4a092d72012-11-28 13:03:30 -05002487struct ext4_ext_path;
2488struct ext4_extent;
2489
Alex Tomasa86c6182006-10-11 01:21:03 -07002490extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2491extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
Mingming Caoa02908f2008-08-19 22:16:07 -04002492extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2493 int chunk);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04002494extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2495 struct ext4_map_blocks *map, int flags);
Jan Karacf108bc2008-07-11 19:27:31 -04002496extern void ext4_ext_truncate(struct inode *);
Allison Hendersona4bb6b62011-05-25 07:41:50 -04002497extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2498 loff_t length);
Alex Tomasa86c6182006-10-11 01:21:03 -07002499extern void ext4_ext_init(struct super_block *);
2500extern void ext4_ext_release(struct super_block *);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002501extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
Amit Aroraa2df2a62007-07-17 21:42:41 -04002502 loff_t len);
Mingming Cao00314622009-09-28 15:49:08 -04002503extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
Eric Sandeena1de02d2010-02-04 23:58:38 -05002504 ssize_t len);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04002505extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2506 struct ext4_map_blocks *map, int flags);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05002507extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2508 ext4_lblk_t lblocks);
2509extern int ext4_extent_tree_init(handle_t *, struct inode *);
2510extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2511 int num,
2512 struct ext4_ext_path *path);
2513extern int ext4_can_extents_be_merged(struct inode *inode,
2514 struct ext4_extent *ex1,
2515 struct ext4_extent *ex2);
2516extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2517 struct ext4_ext_path *,
2518 struct ext4_extent *, int);
2519extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
2520 struct ext4_ext_path *);
2521extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2522extern int ext4_ext_check_inode(struct inode *inode);
2523extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05002524extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2525 __u64 start, __u64 len);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05002526
2527
Akira Fujita748de672009-06-17 19:24:03 -04002528/* move_extent.c */
2529extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2530 __u64 start_orig, __u64 start_donor,
2531 __u64 len, __u64 *moved_len);
2532
Theodore Ts'obd2d0212010-10-27 21:30:10 -04002533/* page-io.c */
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002534extern int __init ext4_init_pageio(void);
Dmitry Monakhov28a535f2012-09-29 00:14:55 -04002535extern void ext4_add_complete_io(ext4_io_end_t *io_end);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002536extern void ext4_exit_pageio(void);
Theodore Ts'of7ad6d22010-11-08 13:43:33 -05002537extern void ext4_ioend_wait(struct inode *);
Theodore Ts'obd2d0212010-10-27 21:30:10 -04002538extern void ext4_free_io_end(ext4_io_end_t *io);
2539extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
Theodore Ts'obd2d0212010-10-27 21:30:10 -04002540extern void ext4_io_submit(struct ext4_io_submit *io);
2541extern int ext4_bio_write_page(struct ext4_io_submit *io,
2542 struct page *page,
2543 int len,
2544 struct writeback_control *wbc);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05002545
Johann Lombardic5e06d12011-05-24 18:31:25 -04002546/* mmp.c */
2547extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
Darrick J. Wong5c359a42012-04-29 18:47:10 -04002548extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2549extern int ext4_mmp_csum_verify(struct super_block *sb,
2550 struct mmp_struct *mmp);
Johann Lombardic5e06d12011-05-24 18:31:25 -04002551
Jiaying Zhang744692d2010-03-04 16:14:02 -05002552/* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2553enum ext4_state_bits {
2554 BH_Uninit /* blocks are allocated but uninitialized on disk */
2555 = BH_JBDPrivateStart,
Aditya Kali7b415bf2011-09-09 19:04:51 -04002556 BH_AllocFromCluster, /* allocated blocks were part of already
2557 * allocated cluster. Note that this flag will
2558 * never, ever appear in a buffer_head's state
2559 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2560 * this is used. */
Jiaying Zhang744692d2010-03-04 16:14:02 -05002561};
2562
2563BUFFER_FNS(Uninit, uninit)
2564TAS_BUFFER_FNS(Uninit, uninit)
2565
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05002566/*
Adam Buchbinder48fc7f72012-09-19 21:48:00 -04002567 * Add new method to test whether block and inode bitmaps are properly
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05002568 * initialized. With uninit_bg reading the block from disk is not enough
2569 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2570 */
2571#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2572
2573static inline int bitmap_uptodate(struct buffer_head *bh)
2574{
2575 return (buffer_uptodate(bh) &&
2576 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2577}
2578static inline void set_bitmap_uptodate(struct buffer_head *bh)
2579{
2580 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2581}
2582
Dmitry Monakhov17335dc2012-09-29 00:41:21 -04002583/*
2584 * Disable DIO read nolock optimization, so new dioreaders will be forced
2585 * to grab i_mutex
2586 */
2587static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2588{
2589 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2590 smp_mb();
2591}
2592static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2593{
2594 smp_mb();
2595 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2596}
2597
Akinobu Mita731eb1a2010-03-03 23:55:01 -05002598#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2599
Eric Sandeene9e3bce2011-02-12 08:17:34 -05002600/* For ioend & aio unwritten conversion wait queues */
2601#define EXT4_WQ_HASH_SZ 37
2602#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2603 EXT4_WQ_HASH_SZ])
2604#define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2605 EXT4_WQ_HASH_SZ])
2606extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2607extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2608
Yongqiang Yang8f82f842011-07-26 21:35:44 -04002609#define EXT4_RESIZING 0
2610extern int ext4_resize_begin(struct super_block *sb);
2611extern void ext4_resize_end(struct super_block *sb);
2612
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002613#endif /* __KERNEL__ */
2614
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002615#endif /* _EXT4_H */