blob: 567a6c7af677c6eb2b4b93932f33cea5869fe698 [file] [log] [blame]
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002 * ext4.h
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040016#ifndef _EXT4_H
17#define _EXT4_H
Dave Kleikampac27a0e2006-10-11 01:20:50 -070018
19#include <linux/types.h>
Mingming Cao3a5b2ec2006-10-11 01:21:05 -070020#include <linux/blkdev.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070021#include <linux/magic.h>
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -050022#include <linux/jbd2.h>
Mingming Cao60e58e02009-01-22 18:13:05 +010023#include <linux/quota.h>
Theodore Ts'od444c3c2009-05-01 13:44:33 -040024#include <linux/rwsem.h>
25#include <linux/rbtree.h>
26#include <linux/seqlock.h>
27#include <linux/mutex.h>
Theodore Ts'oca0faba2009-05-03 16:33:44 -040028#include <linux/timer.h>
David Turnera4dad1a2015-11-24 14:34:37 -050029#include <linux/version.h>
Theodore Ts'oca0faba2009-05-03 16:33:44 -040030#include <linux/wait.h>
31#include <linux/blockgroup_lock.h>
32#include <linux/percpu_counter.h>
Theodore Ts'oefbed4d2013-10-17 21:11:01 -040033#include <linux/ratelimit.h>
Darrick J. Wong04419842012-04-29 18:27:10 -040034#include <crypto/hash.h>
Jaegeuk Kima7550b32016-07-10 14:01:03 -040035#include <linux/fscrypto.h>
Lukas Czernera633f5a2014-02-22 06:18:17 -050036#include <linux/falloc.h>
Daeho Jeongc8585c62016-04-25 23:22:35 -040037#include <linux/percpu-rwsem.h>
Ben Hutchings4d92dc02010-05-17 06:00:00 -040038#ifdef __KERNEL__
39#include <linux/compat.h>
40#endif
Alex Tomasc9de5602008-01-29 00:19:52 -050041
Dave Kleikampac27a0e2006-10-11 01:20:50 -070042/*
Shen Feng8a356942008-07-11 19:27:31 -040043 * The fourth extended filesystem constants/structures
Dave Kleikampac27a0e2006-10-11 01:20:50 -070044 */
45
46/*
Aihua Zhanga2821e342016-03-13 17:18:12 -040047 * with AGGRESSIVE_CHECK allocator runs consistency checks over
48 * structures. these checks slow things down a lot
49 */
50#define AGGRESSIVE_CHECK__
51
52/*
53 * with DOUBLE_CHECK defined mballoc creates persistent in-core
54 * bitmaps, maintains and uses them to check for double allocations
55 */
56#define DOUBLE_CHECK__
57
58/*
Mingming Cao617ba132006-10-11 01:20:53 -070059 * Define EXT4FS_DEBUG to produce debug messages
Dave Kleikampac27a0e2006-10-11 01:20:50 -070060 */
Mingming Cao617ba132006-10-11 01:20:53 -070061#undef EXT4FS_DEBUG
Dave Kleikampac27a0e2006-10-11 01:20:50 -070062
63/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -070064 * Debug code
65 */
Mingming Cao617ba132006-10-11 01:20:53 -070066#ifdef EXT4FS_DEBUG
67#define ext4_debug(f, a...) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070068 do { \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040069 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -040070 __FILE__, __LINE__, __func__); \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040071 printk(KERN_DEBUG f, ## a); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070072 } while (0)
73#else
Joe Perchesace36ad2012-03-19 23:11:43 -040074#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070075#endif
76
Theodore Ts'o4a092d72012-11-28 13:03:30 -050077/*
78 * Turn on EXT_DEBUG to get lots of info about extents operations.
79 */
80#define EXT_DEBUG__
81#ifdef EXT_DEBUG
82#define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
83#else
84#define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
85#endif
86
Theodore Ts'od444c3c2009-05-01 13:44:33 -040087/* data type for block offset of block group */
88typedef int ext4_grpblk_t;
89
90/* data type for filesystem-wide blocks number */
91typedef unsigned long long ext4_fsblk_t;
92
93/* data type for file logical block number */
94typedef __u32 ext4_lblk_t;
95
96/* data type for block group number */
97typedef unsigned int ext4_group_t;
98
Namjae Jeon331573f2015-06-09 01:55:03 -040099enum SHIFT_DIRECTION {
100 SHIFT_LEFT = 0,
101 SHIFT_RIGHT,
102};
103
Theodore Ts'o296c3552009-09-30 00:32:42 -0400104/*
Theodore Ts'o60e66792010-05-17 07:00:00 -0400105 * Flags used in mballoc's allocation_context flags field.
Theodore Ts'o296c3552009-09-30 00:32:42 -0400106 *
107 * Also used to show what's going on for debugging purposes when the
108 * flag field is exported via the traceport interface
109 */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400110
Alex Tomasc9de5602008-01-29 00:19:52 -0500111/* prefer goal again. length */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400112#define EXT4_MB_HINT_MERGE 0x0001
Alex Tomasc9de5602008-01-29 00:19:52 -0500113/* blocks already reserved */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400114#define EXT4_MB_HINT_RESERVED 0x0002
Alex Tomasc9de5602008-01-29 00:19:52 -0500115/* metadata is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400116#define EXT4_MB_HINT_METADATA 0x0004
Alex Tomasc9de5602008-01-29 00:19:52 -0500117/* first blocks in the file */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400118#define EXT4_MB_HINT_FIRST 0x0008
Alex Tomasc9de5602008-01-29 00:19:52 -0500119/* search for the best chunk */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400120#define EXT4_MB_HINT_BEST 0x0010
Alex Tomasc9de5602008-01-29 00:19:52 -0500121/* data is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400122#define EXT4_MB_HINT_DATA 0x0020
Alex Tomasc9de5602008-01-29 00:19:52 -0500123/* don't preallocate (for tails) */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400124#define EXT4_MB_HINT_NOPREALLOC 0x0040
Alex Tomasc9de5602008-01-29 00:19:52 -0500125/* allocate for locality group */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400126#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
Alex Tomasc9de5602008-01-29 00:19:52 -0500127/* allocate goal blocks or none */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400128#define EXT4_MB_HINT_GOAL_ONLY 0x0100
Alex Tomasc9de5602008-01-29 00:19:52 -0500129/* goal is meaningful */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400130#define EXT4_MB_HINT_TRY_GOAL 0x0200
Mingming Caod2a17632008-07-14 17:52:37 -0400131/* blocks already pre-reserved by delayed allocation */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400132#define EXT4_MB_DELALLOC_RESERVED 0x0400
Theodore Ts'o4ba74d02009-08-09 22:01:13 -0400133/* We are doing stream allocation */
134#define EXT4_MB_STREAM_ALLOC 0x0800
Allison Henderson55f020d2011-05-25 07:41:26 -0400135/* Use reserved root blocks if needed */
136#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
Lukas Czerner27dd4382013-04-09 22:11:22 -0400137/* Use blocks from reserved pool */
138#define EXT4_MB_USE_RESERVED 0x2000
Alex Tomasc9de5602008-01-29 00:19:52 -0500139
140struct ext4_allocation_request {
141 /* target inode for block we're allocating */
142 struct inode *inode;
Alex Tomasc9de5602008-01-29 00:19:52 -0500143 /* how many blocks we want to allocate */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500144 unsigned int len;
Eric Sandeen726447d2009-07-13 10:24:17 -0400145 /* logical block in target inode */
146 ext4_lblk_t logical;
147 /* the closest logical allocated block to the left */
148 ext4_lblk_t lleft;
149 /* the closest logical allocated block to the right */
150 ext4_lblk_t lright;
151 /* phys. target (a hint) */
152 ext4_fsblk_t goal;
153 /* phys. block for the closest logical allocated block to the left */
154 ext4_fsblk_t pleft;
155 /* phys. block for the closest logical allocated block to the right */
156 ext4_fsblk_t pright;
Alex Tomasc9de5602008-01-29 00:19:52 -0500157 /* flags. see above EXT4_MB_HINT_* */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500158 unsigned int flags;
Alex Tomasc9de5602008-01-29 00:19:52 -0500159};
160
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700161/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400162 * Logical to physical block mapping, used by ext4_map_blocks()
163 *
164 * This structure is used to pass requests into ext4_map_blocks() as
165 * well as to store the information returned by ext4_map_blocks(). It
166 * takes less room on the stack than a struct buffer_head.
167 */
168#define EXT4_MAP_NEW (1 << BH_New)
169#define EXT4_MAP_MAPPED (1 << BH_Mapped)
170#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
171#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400172#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
Jan Karacbd75842014-11-25 11:41:49 -0500173 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400174
175struct ext4_map_blocks {
176 ext4_fsblk_t m_pblk;
177 ext4_lblk_t m_lblk;
178 unsigned int m_len;
179 unsigned int m_flags;
180};
181
182/*
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400183 * Flags for ext4_io_end->flags
184 */
185#define EXT4_IO_END_UNWRITTEN 0x0001
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400186
Curt Wohlgemuth41881882012-03-05 10:40:22 -0500187/*
Lukas Czerner556615d2014-04-20 23:45:47 -0400188 * For converting unwritten extents on a work queue. 'handle' is used for
Jan Kara6b523df2013-06-04 13:21:11 -0400189 * buffered writeback.
Curt Wohlgemuth41881882012-03-05 10:40:22 -0500190 */
Mingming Cao00314622009-09-28 15:49:08 -0400191typedef struct ext4_io_end {
jiayingz@google.com (Jiaying Zhang)5b3ff232010-07-27 11:56:06 -0400192 struct list_head list; /* per-file finished IO list */
Jan Kara6b523df2013-06-04 13:21:11 -0400193 handle_t *handle; /* handle reserved for extent
194 * conversion */
Mingming Cao00314622009-09-28 15:49:08 -0400195 struct inode *inode; /* file being written to */
Jan Karab0857d32013-06-04 14:23:41 -0400196 struct bio *bio; /* Linked list of completed
197 * bios covering the extent */
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400198 unsigned int flag; /* unwritten or not */
Jan Kara3bd6ad72016-03-08 22:26:39 -0500199 atomic_t count; /* reference counter */
Eric Sandeena1de02d2010-02-04 23:58:38 -0500200 loff_t offset; /* offset in the file */
201 ssize_t size; /* size of the extent */
Mingming Cao00314622009-09-28 15:49:08 -0400202} ext4_io_end_t;
203
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400204struct ext4_io_submit {
Tejun Heo5a339112015-07-21 23:50:24 -0400205 struct writeback_control *io_wbc;
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400206 struct bio *io_bio;
207 ext4_io_end_t *io_end;
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400208 sector_t io_next_block;
209};
210
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400211/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700212 * Special inodes numbers
213 */
Mingming Cao617ba132006-10-11 01:20:53 -0700214#define EXT4_BAD_INO 1 /* Bad blocks inode */
215#define EXT4_ROOT_INO 2 /* Root inode */
Aditya Kaliae812302011-05-24 19:00:39 -0400216#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
217#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
Mingming Cao617ba132006-10-11 01:20:53 -0700218#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
219#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
220#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
221#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700222
Mingming Cao617ba132006-10-11 01:20:53 -0700223/* First non-reserved inode for old ext4 filesystems */
224#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700225
226/*
227 * Maximal count of links to a file
228 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400229#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700230
231/*
232 * Macro-instructions used to manage several block sizes
233 */
Mingming Cao617ba132006-10-11 01:20:53 -0700234#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -0500235#define EXT4_MAX_BLOCK_SIZE 65536
236#define EXT4_MIN_BLOCK_LOG_SIZE 10
Curt Wohlgemuthfb1813f2010-10-27 21:29:12 -0400237#define EXT4_MAX_BLOCK_LOG_SIZE 16
Theodore Ts'o8cdf3372016-11-18 13:00:24 -0500238#define EXT4_MAX_CLUSTER_LOG_SIZE 30
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700239#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700240# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700241#else
Mingming Cao617ba132006-10-11 01:20:53 -0700242# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700243#endif
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400244#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
Theodore Ts'o281b5992011-09-09 18:34:51 -0400245#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
246 EXT4_SB(s)->s_cluster_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700247#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700248# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Theodore Ts'o281b5992011-09-09 18:34:51 -0400249# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700250#else
Mingming Cao617ba132006-10-11 01:20:53 -0700251# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700252#endif
253#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700254#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
255#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
256#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700257#else
Mingming Cao617ba132006-10-11 01:20:53 -0700258#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
259 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700260 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -0700261#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
262 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700263 (s)->s_first_ino)
264#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400265#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Fabian Frederick518eaa62016-09-15 11:55:01 -0400266#define EXT4_MAX_BLOCKS(size, offset, blkbits) \
267 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
268 blkbits))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700269
Theodore Ts'od5b8f312011-09-09 18:44:51 -0400270/* Translate a block number to a cluster number */
271#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
272/* Translate a cluster number to a block number */
273#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
274/* Translate # of blks to # of clusters */
275#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
276 (sbi)->s_cluster_bits)
Theodore Ts'of5a44db2013-12-20 09:29:35 -0500277/* Mask out the low bits to get the starting block of the cluster */
278#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
279 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
280#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
281 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
282/* Get the cluster offset */
283#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
284 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
285#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
286 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
Theodore Ts'od5b8f312011-09-09 18:44:51 -0400287
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700288/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700289 * Structure of a blocks group descriptor
290 */
Mingming Cao617ba132006-10-11 01:20:53 -0700291struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700292{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400293 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400294 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
295 __le32 bg_inode_table_lo; /* Inodes table block */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500296 __le16 bg_free_blocks_count_lo;/* Free blocks count */
297 __le16 bg_free_inodes_count_lo;/* Free inodes count */
298 __le16 bg_used_dirs_count_lo; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400299 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
Darrick J. Wonge6153912012-04-29 18:23:10 -0400300 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
301 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
302 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500303 __le16 bg_itable_unused_lo; /* Unused inodes count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400304 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700305 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
306 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
307 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500308 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
309 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
310 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500311 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
Darrick J. Wonge6153912012-04-29 18:23:10 -0400312 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
313 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
314 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
315 __u32 bg_reserved;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700316};
317
Darrick J. Wong41a246d2012-04-29 18:33:10 -0400318#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
319 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
320 sizeof(__le16))
321#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
322 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
323 sizeof(__le16))
324
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400325/*
326 * Structure of a flex block group info
327 */
328
329struct flex_groups {
Theodore Ts'o90ba9832013-03-11 23:39:59 -0400330 atomic64_t free_clusters;
331 atomic_t free_inodes;
332 atomic_t used_dirs;
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400333};
334
Andreas Dilger717d50e2007-10-16 18:38:25 -0400335#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
336#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
337#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
338
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700339/*
340 * Macro-instructions used to manage group descriptors
341 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700342#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700343#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700344#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
345#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700346#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700347# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
Theodore Ts'o281b5992011-09-09 18:34:51 -0400348# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
Mingming Cao617ba132006-10-11 01:20:53 -0700349# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
350# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
351# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700352#else
Mingming Cao617ba132006-10-11 01:20:53 -0700353# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700354# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700355# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700356#endif
357
358/*
359 * Constants relative to the data blocks
360 */
Mingming Cao617ba132006-10-11 01:20:53 -0700361#define EXT4_NDIR_BLOCKS 12
362#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
363#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
364#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
365#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700366
367/*
368 * Inode flags
369 */
Mingming Cao617ba132006-10-11 01:20:53 -0700370#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
371#define EXT4_UNRM_FL 0x00000002 /* Undelete */
372#define EXT4_COMPR_FL 0x00000004 /* Compress file */
373#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
374#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
375#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
376#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
377#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700378/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700379#define EXT4_DIRTY_FL 0x00000100
380#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
381#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
Theodore Ts'o3edc18d2015-01-19 16:00:58 -0500382 /* nb: was previously EXT2_ECOMPR_FL */
383#define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700384/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700385#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
386#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
387#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
388#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
389#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
390#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500391#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
Alex Tomasa86c6182006-10-11 01:21:03 -0700392#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Theodore Ts'of710b4b2010-01-25 03:31:32 -0500393#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500394#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
Tao Ma67cf5b02012-12-10 14:04:46 -0500395#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
Theodore Ts'o8b4953e2015-10-17 16:15:18 -0400396#define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500397#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700398
Li Xi040cb372016-01-08 16:01:21 -0500399#define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */
400#define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700401
Li Xi9b7365f2016-01-08 16:01:22 -0500402#define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
403 EXT4_IMMUTABLE_FL | \
404 EXT4_APPEND_FL | \
405 EXT4_NODUMP_FL | \
406 EXT4_NOATIME_FL | \
407 EXT4_PROJINHERIT_FL)
408
Duane Griffin8fa43a82009-02-15 18:57:26 -0500409/* Flags that should be inherited by new inodes from their parent. */
410#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
Theodore Ts'o1cd9f092011-08-31 11:54:51 -0400411 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
Duane Griffin8fa43a82009-02-15 18:57:26 -0500412 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
Li Xi040cb372016-01-08 16:01:21 -0500413 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
414 EXT4_PROJINHERIT_FL)
Duane Griffin8fa43a82009-02-15 18:57:26 -0500415
Duane Griffin2dc6b0d2009-02-15 18:09:20 -0500416/* Flags that are appropriate for regular files (all but dir-specific ones). */
417#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
418
419/* Flags that are appropriate for non-directories/regular files. */
420#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
421
422/* Mask out flags that are inappropriate for the given type of inode. */
423static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
424{
425 if (S_ISDIR(mode))
426 return flags;
427 else if (S_ISREG(mode))
428 return flags & EXT4_REG_FLMASK;
429 else
430 return flags & EXT4_OTHER_FLMASK;
431}
432
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400433/*
434 * Inode flags used for atomic set/get
435 */
436enum {
437 EXT4_INODE_SECRM = 0, /* Secure deletion */
438 EXT4_INODE_UNRM = 1, /* Undelete */
439 EXT4_INODE_COMPR = 2, /* Compress file */
440 EXT4_INODE_SYNC = 3, /* Synchronous updates */
441 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
442 EXT4_INODE_APPEND = 5, /* writes to file may only append */
443 EXT4_INODE_NODUMP = 6, /* do not dump file */
444 EXT4_INODE_NOATIME = 7, /* do not update atime */
445/* Reserved for compression usage... */
446 EXT4_INODE_DIRTY = 8,
447 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
448 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
Theodore Ts'of542fbe2015-04-11 07:44:12 -0400449 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400450/* End compression flags --- maybe not all used */
451 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
452 EXT4_INODE_IMAGIC = 13, /* AFS directory */
453 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
454 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
455 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
456 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
457 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
458 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
459 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
460 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
Tao Ma67cf5b02012-12-10 14:04:46 -0500461 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
Theodore Ts'o8b4953e2015-10-17 16:15:18 -0400462 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
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);
Theodore Ts'o3edc18d2015-01-19 16:00:58 -0500495 CHECK_FLAG_VALUE(ENCRYPT);
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400496 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);
Theodore Ts'o8b4953e2015-10-17 16:15:18 -0400507 CHECK_FLAG_VALUE(PROJINHERIT);
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400508 CHECK_FLAG_VALUE(RESERVED);
509}
510
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700511/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700512struct ext4_new_group_input {
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400513 __u32 group; /* Group number for this data */
514 __u64 block_bitmap; /* Absolute block number of block bitmap */
515 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
516 __u64 inode_table; /* Absolute block number of inode table start */
517 __u32 blocks_count; /* Total number of blocks in this group */
518 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700519 __u16 unused;
520};
521
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400522#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
523struct compat_ext4_new_group_input {
524 u32 group;
525 compat_u64 block_bitmap;
526 compat_u64 inode_bitmap;
527 compat_u64 inode_table;
528 u32 blocks_count;
529 u16 reserved_blocks;
530 u16 unused;
531};
532#endif
533
Mingming Cao617ba132006-10-11 01:20:53 -0700534/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
535struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700536 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700537 __u64 block_bitmap;
538 __u64 inode_bitmap;
539 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700540 __u32 blocks_count;
541 __u16 reserved_blocks;
542 __u16 unused;
543 __u32 free_blocks_count;
544};
545
Yongqiang Yang33afdcc2012-01-03 23:32:52 -0500546/* Indexes used to index group tables in ext4_new_group_data */
547enum {
548 BLOCK_BITMAP = 0, /* block bitmap */
549 INODE_BITMAP, /* inode bitmap */
550 INODE_TABLE, /* inode tables */
551 GROUP_TABLE_COUNT,
552};
553
Amit Aroraa2df2a62007-07-17 21:42:41 -0400554/*
Eric Sandeen79e83032010-07-27 11:56:07 -0400555 * Flags used by ext4_map_blocks()
Amit Aroraa2df2a62007-07-17 21:42:41 -0400556 */
Lukas Czerner556615d2014-04-20 23:45:47 -0400557 /* Allocate any needed blocks and/or convert an unwritten
Theodore Ts'oc2177052009-05-14 00:58:52 -0400558 extent to be an initialized ext4 */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400559#define EXT4_GET_BLOCKS_CREATE 0x0001
Lukas Czerner556615d2014-04-20 23:45:47 -0400560 /* Request the creation of an unwritten extent */
561#define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
562#define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
Theodore Ts'oc2177052009-05-14 00:58:52 -0400563 EXT4_GET_BLOCKS_CREATE)
Lukas Czerner27dd4382013-04-09 22:11:22 -0400564 /* Caller is from the delayed allocation writeout path
565 * finally doing the actual allocation of delayed blocks */
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
Lukas Czerner556615d2014-04-20 23:45:47 -0400568 unwritten extents if not allocated, split the unwritten
Mingming Cao00314622009-09-28 15:49:08 -0400569 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|\
Lukas Czerner556615d2014-04-20 23:45:47 -0400573 EXT4_GET_BLOCKS_CREATE_UNWRIT_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|\
Lukas Czerner556615d2014-04-20 23:45:47 -0400576 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
Lukas Czerner27dd4382013-04-09 22:11:22 -0400577 /* Eventual metadata allocation (due to growing extent tree)
578 * should not fail, so try to use reserved blocks for that.*/
579#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
Vivek Haldar556b27a2011-05-25 07:41:54 -0400580 /* Don't normalize allocation size (used for fallocate) */
581#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
Dmitry Monakhova4e5d882011-10-25 08:15:12 -0400582 /* Request will not result in inode size update (user for fallocate) */
583#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
Lukas Czernerb8a86842014-03-18 18:05:35 -0400584 /* Convert written extents to unwritten */
Jan Kara2dcba472015-12-07 15:04:57 -0500585#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
Jan Karac86d8db2015-12-07 15:10:26 -0500586 /* Write zeros to newly created written extents */
587#define EXT4_GET_BLOCKS_ZERO 0x0200
588#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
589 EXT4_GET_BLOCKS_ZERO)
Jan Karaee0876b2016-04-24 00:56:08 -0400590 /* Caller will submit data before dropping transaction handle. This
591 * allows jbd2 to avoid submitting data before commit. */
592#define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700593
594/*
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400595 * The bit position of these flags must not overlap with any of the
Theodore Ts'oed8a1a72014-09-01 14:43:09 -0400596 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400597 * read_extent_tree_block(), ext4_split_extent_at(),
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400598 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
599 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
600 * caching the extents when reading from the extent tree while a
601 * truncate or punch hole operation is in progress.
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400602 */
Theodore Ts'od26e2c42014-09-04 18:09:29 -0400603#define EXT4_EX_NOCACHE 0x40000000
604#define EXT4_EX_FORCE_CACHE 0x20000000
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400605
606/*
Theodore Ts'oe6362602009-11-23 07:17:05 -0500607 * Flags used by ext4_free_blocks
608 */
609#define EXT4_FREE_BLOCKS_METADATA 0x0001
610#define EXT4_FREE_BLOCKS_FORGET 0x0002
Theodore Ts'o1f2acb62010-01-22 17:40:42 -0500611#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
Maxim Patlasov7132de72011-07-10 19:37:48 -0400612#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
Theodore Ts'o84130192011-09-09 18:50:51 -0400613#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
614#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
Theodore Ts'oe6362602009-11-23 07:17:05 -0500615
616/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700617 * ioctl commands
618 */
Mingming Cao617ba132006-10-11 01:20:53 -0700619#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
620#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
621#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
622#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
Mingming Cao617ba132006-10-11 01:20:53 -0700623#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
624#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Mingming Cao617ba132006-10-11 01:20:53 -0700625#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
626#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400627#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
628#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
629#define EXT4_IOC_MIGRATE _IO('f', 9)
Theodore Ts'occd25062009-02-26 01:04:07 -0500630 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400631 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
Theodore Ts'occd25062009-02-26 01:04:07 -0500632#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
Akira Fujita748de672009-06-17 19:24:03 -0400633#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
Yongqiang Yang19c52462012-01-04 17:09:44 -0500634#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400635#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400636#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
Jaegeuk Kima7550b32016-07-10 14:01:03 -0400637#define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY
638#define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT
639#define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700640
Li Xi9b7365f2016-01-08 16:01:22 -0500641#ifndef FS_IOC_FSGETXATTR
642/* Until the uapi changes get merged for project quota... */
643
644#define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr)
645#define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr)
646
647/*
648 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
649 */
650struct fsxattr {
651 __u32 fsx_xflags; /* xflags field value (get/set) */
652 __u32 fsx_extsize; /* extsize field value (get/set)*/
653 __u32 fsx_nextents; /* nextents field value (get) */
654 __u32 fsx_projid; /* project identifier (get/set) */
655 unsigned char fsx_pad[12];
656};
657
658/*
659 * Flags for the fsx_xflags field
660 */
661#define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */
662#define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */
663#define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */
664#define FS_XFLAG_APPEND 0x00000010 /* all writes append */
665#define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */
666#define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */
667#define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */
668#define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */
669#define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */
670#define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */
671#define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */
672#define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */
673#define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */
674#define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */
675#define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */
676#endif /* !defined(FS_IOC_FSGETXATTR) */
677
678#define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR
679#define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR
680
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400681#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700682/*
683 * ioctl commands in 32 bit emulation
684 */
Mingming Cao617ba132006-10-11 01:20:53 -0700685#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
686#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
687#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
688#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
689#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
690#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
691#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400692#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
Mingming Cao617ba132006-10-11 01:20:53 -0700693#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
694#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400695#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700696
Uwe Kleine-Königb5950762010-11-01 15:38:34 -0400697/* Max physical block we can address w/o extents */
Eric Sandeenfb0a3872009-09-16 14:45:10 -0400698#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
699
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700700/*
701 * Structure of an inode on the disk
702 */
Mingming Cao617ba132006-10-11 01:20:53 -0700703struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700704 __le16 i_mode; /* File mode */
705 __le16 i_uid; /* Low 16 bits of Owner Uid */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500706 __le32 i_size_lo; /* Size in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700707 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400708 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700709 __le32 i_mtime; /* Modification time */
710 __le32 i_dtime; /* Deletion Time */
711 __le16 i_gid; /* Low 16 bits of Group Id */
712 __le16 i_links_count; /* Links count */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500713 __le32 i_blocks_lo; /* Blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700714 __le32 i_flags; /* File flags */
715 union {
716 struct {
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500717 __le32 l_i_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700718 } linux1;
719 struct {
720 __u32 h_i_translator;
721 } hurd1;
722 struct {
723 __u32 m_i_reserved1;
724 } masix1;
725 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700726 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700727 __le32 i_generation; /* File version (for NFS) */
Aneesh Kumar K.V7973c0c2008-01-28 23:58:27 -0500728 __le32 i_file_acl_lo; /* File ACL */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500729 __le32 i_size_high;
Coly Lif077d0d2007-10-16 18:38:25 -0400730 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700731 union {
732 struct {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500733 __le16 l_i_blocks_high; /* were l_i_reserved1 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700734 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400735 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700736 __le16 l_i_gid_high; /* were reserved2[0] */
Darrick J. Wonge6153912012-04-29 18:23:10 -0400737 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
738 __le16 l_i_reserved;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700739 } linux2;
740 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400741 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700742 __u16 h_i_mode_high;
743 __u16 h_i_uid_high;
744 __u16 h_i_gid_high;
745 __u32 h_i_author;
746 } hurd2;
747 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400748 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700749 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700750 __u32 m_i_reserved2[2];
751 } masix2;
752 } osd2; /* OS dependent 2 */
753 __le16 i_extra_isize;
Darrick J. Wonge6153912012-04-29 18:23:10 -0400754 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400755 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
756 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
757 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
758 __le32 i_crtime; /* File Creation time */
759 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500760 __le32 i_version_hi; /* high 32 bits for 64-bit version */
Theodore Ts'o8b4953e2015-10-17 16:15:18 -0400761 __le32 i_projid; /* Project ID */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700762};
763
Akira Fujita748de672009-06-17 19:24:03 -0400764struct move_extent {
765 __u32 reserved; /* should be zero */
766 __u32 donor_fd; /* donor file descriptor */
767 __u64 orig_start; /* logical start offset in block for orig */
768 __u64 donor_start; /* logical start offset in block for donor */
769 __u64 len; /* block length to be moved */
770 __u64 moved_len; /* moved block length */
771};
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700772
Kalpak Shahef7f3832007-07-18 09:15:20 -0400773#define EXT4_EPOCH_BITS 2
774#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
775#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
776
777/*
778 * Extended fields will fit into an inode if the filesystem was formatted
779 * with large inodes (-I 256 or larger) and there are not currently any EAs
780 * consuming all of the available space. For new inodes we always reserve
781 * enough space for the kernel's known extended fields, but for inodes
782 * created with an old kernel this might not have been the case. None of
783 * the extended inode fields is critical for correct filesystem operation.
784 * This macro checks if a certain field fits in the inode. Note that
785 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
786 */
787#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
788 ((offsetof(typeof(*ext4_inode), field) + \
789 sizeof((ext4_inode)->field)) \
790 <= (EXT4_GOOD_OLD_INODE_SIZE + \
791 (einode)->i_extra_isize)) \
792
David Turnera4dad1a2015-11-24 14:34:37 -0500793/*
794 * We use an encoding that preserves the times for extra epoch "00":
795 *
796 * extra msb of adjust for signed
797 * epoch 32-bit 32-bit tv_sec to
798 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
799 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
800 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
801 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
802 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
803 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
804 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
805 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
806 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
807 *
808 * Note that previous versions of the kernel on 64-bit systems would
809 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
810 * 1970. e2fsck will correct this, assuming that it is run on the
811 * affected filesystem before 2242.
812 */
813
Kalpak Shahef7f3832007-07-18 09:15:20 -0400814static inline __le32 ext4_encode_extra_time(struct timespec *time)
815{
David Turnera4dad1a2015-11-24 14:34:37 -0500816 u32 extra = sizeof(time->tv_sec) > 4 ?
817 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0;
818 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
Kalpak Shahef7f3832007-07-18 09:15:20 -0400819}
820
821static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
822{
David Turnera4dad1a2015-11-24 14:34:37 -0500823 if (unlikely(sizeof(time->tv_sec) > 4 &&
824 (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) {
825#if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
826 /* Handle legacy encoding of pre-1970 dates with epoch
827 * bits 1,1. We assume that by kernel version 4.20,
828 * everyone will have run fsck over the affected
829 * filesystems to correct the problem. (This
830 * backwards compatibility may be removed before this
831 * time, at the discretion of the ext4 developers.)
832 */
833 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
834 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
835 extra_bits = 0;
836 time->tv_sec += extra_bits << 32;
837#else
838 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
839#endif
840 }
841 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400842}
843
844#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
845do { \
846 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
847 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
848 (raw_inode)->xtime ## _extra = \
849 ext4_encode_extra_time(&(inode)->xtime); \
850} while (0)
851
852#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
853do { \
854 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
855 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
856 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
857 (raw_inode)->xtime ## _extra = \
858 ext4_encode_extra_time(&(einode)->xtime); \
859} while (0)
860
861#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
862do { \
863 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
864 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
865 ext4_decode_extra_time(&(inode)->xtime, \
866 raw_inode->xtime ## _extra); \
Eric Sandeenaf0b44a2010-12-19 22:10:31 -0500867 else \
868 (inode)->xtime.tv_nsec = 0; \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400869} while (0)
870
871#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
872do { \
873 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
874 (einode)->xtime.tv_sec = \
875 (signed)le32_to_cpu((raw_inode)->xtime); \
Theodore Ts'o19ea8062014-02-16 19:29:32 -0500876 else \
877 (einode)->xtime.tv_sec = 0; \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400878 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
879 ext4_decode_extra_time(&(einode)->xtime, \
880 raw_inode->xtime ## _extra); \
Eric Sandeenaf0b44a2010-12-19 22:10:31 -0500881 else \
882 (einode)->xtime.tv_nsec = 0; \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400883} while (0)
884
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500885#define i_disk_version osd1.linux1.l_i_version
886
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700887#if defined(__KERNEL__) || defined(__linux__)
888#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700889#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500890#define i_blocks_high osd2.linux2.l_i_blocks_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700891#define i_uid_low i_uid
892#define i_gid_low i_gid
893#define i_uid_high osd2.linux2.l_i_uid_high
894#define i_gid_high osd2.linux2.l_i_gid_high
Darrick J. Wonge6153912012-04-29 18:23:10 -0400895#define i_checksum_lo osd2.linux2.l_i_checksum_lo
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700896
897#elif defined(__GNU__)
898
899#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700900#define i_uid_high osd2.hurd2.h_i_uid_high
901#define i_gid_high osd2.hurd2.h_i_gid_high
902#define i_author osd2.hurd2.h_i_author
903
904#elif defined(__masix__)
905
906#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700907#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700908#define i_reserved2 osd2.masix2.m_i_reserved2
909
910#endif /* defined(__KERNEL__) || defined(__linux__) */
911
Zheng Liuc0677e62012-11-08 15:18:54 -0500912#include "extents_status.h"
913
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400914/*
Theodore Ts'odaf647d2016-04-01 01:31:28 -0400915 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
916 *
917 * These are needed to avoid lockdep false positives when we need to
918 * allocate blocks to the quota inode during ext4_map_blocks(), while
919 * holding i_data_sem for a normal (non-quota) inode. Since we don't
920 * do quota tracking for the quota inode, this avoids deadlock (as
921 * well as infinite recursion, since it isn't turtles all the way
922 * down...)
923 *
924 * I_DATA_SEM_NORMAL - Used for most inodes
925 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
926 * where the second inode has larger inode number
927 * than the first
928 * I_DATA_SEM_QUOTA - Used for quota inodes only
929 */
930enum {
931 I_DATA_SEM_NORMAL = 0,
932 I_DATA_SEM_OTHER,
933 I_DATA_SEM_QUOTA,
934};
935
936
937/*
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400938 * fourth extended file system inode data in memory
939 */
940struct ext4_inode_info {
941 __le32 i_data[15]; /* unconverted */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400942 __u32 i_dtime;
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400943 ext4_fsblk_t i_file_acl;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400944
945 /*
946 * i_block_group is the number of the block group which contains
947 * this file's inode. Constant across the lifetime of the inode,
948 * it is ued for making block allocation decisions - we try to
949 * place a file's data blocks near its inode block, and new inodes
950 * near to their parent directory's inode.
951 */
952 ext4_group_t i_block_group;
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500953 ext4_lblk_t i_dir_start_lookup;
Theodore Ts'o353eb832011-01-10 12:18:25 -0500954#if (BITS_PER_LONG < 64)
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500955 unsigned long i_state_flags; /* Dynamic state flags */
Theodore Ts'o353eb832011-01-10 12:18:25 -0500956#endif
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400957 unsigned long i_flags;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400958
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400959 /*
960 * Extended attributes can be read independently of the main file
961 * data. Taking i_mutex even when reading would cause contention
962 * between readers of EAs and writers of regular file data, so
963 * instead we synchronize on xattr_sem when reading or changing
964 * EAs.
965 */
966 struct rw_semaphore xattr_sem;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400967
968 struct list_head i_orphan; /* unlinked but open inodes */
969
970 /*
971 * i_disksize keeps track of what the inode size is ON DISK, not
972 * in memory. During truncate, i_size is set to the new size by
973 * the VFS prior to calling ext4_truncate(), but the filesystem won't
974 * set i_disksize to 0 until the truncate is actually under way.
975 *
976 * The intent is that i_disksize always represents the blocks which
977 * are used by this file. This allows recovery to restart truncate
978 * on orphans if we crash during truncate. We actually write i_disksize
979 * into the on-disk inode when writing inodes out, instead of i_size.
980 *
981 * The only time when i_disksize and i_size may be different is when
982 * a truncate is in progress. The only things which change i_disksize
983 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
984 */
985 loff_t i_disksize;
986
987 /*
988 * i_data_sem is for serialising ext4_truncate() against
989 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
990 * data tree are chopped off during truncate. We can't do that in
991 * ext4 because whenever we perform intermediate commits during
992 * truncate, the inode and all the metadata blocks *must* be in a
993 * consistent state which allows truncation of the orphans to restart
994 * during recovery. Hence we must fix the get_block-vs-truncate race
995 * by other means, so we have i_data_sem.
996 */
997 struct rw_semaphore i_data_sem;
Jan Karaea3d7202015-12-07 14:28:03 -0500998 /*
999 * i_mmap_sem is for serializing page faults with truncate / punch hole
1000 * operations. We have to make sure that new page cannot be faulted in
1001 * a section of the inode that is being punched. We cannot easily use
1002 * i_data_sem for this since we need protection for the whole punch
1003 * operation and i_data_sem ranks below transaction start so we have
1004 * to occasionally drop it.
1005 */
1006 struct rw_semaphore i_mmap_sem;
Theodore Ts'od444c3c2009-05-01 13:44:33 -04001007 struct inode vfs_inode;
Theodore Ts'o8aefcd52011-01-10 12:29:43 -05001008 struct jbd2_inode *jinode;
Theodore Ts'od444c3c2009-05-01 13:44:33 -04001009
Theodore Ts'o202ee5d2014-04-21 14:37:55 -04001010 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1011
Theodore Ts'od444c3c2009-05-01 13:44:33 -04001012 /*
1013 * File creation time. Its function is same as that of
1014 * struct timespec i_{a,c,m}time in the generic inode.
1015 */
1016 struct timespec i_crtime;
1017
1018 /* mballoc */
1019 struct list_head i_prealloc_list;
1020 spinlock_t i_prealloc_lock;
1021
Zheng Liuc0677e62012-11-08 15:18:54 -05001022 /* extents status tree */
1023 struct ext4_es_tree i_es_tree;
1024 rwlock_t i_es_lock;
Zheng Liuedaa53c2014-11-25 11:45:37 -05001025 struct list_head i_es_list;
Zheng Liueb68d0e2014-09-01 22:26:49 -04001026 unsigned int i_es_all_nr; /* protected by i_es_lock */
Zheng Liuedaa53c2014-11-25 11:45:37 -05001027 unsigned int i_es_shk_nr; /* protected by i_es_lock */
Jan Karadd475922014-11-25 11:51:23 -05001028 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1029 extents to shrink. Protected by
1030 i_es_lock */
Zheng Liuc0677e62012-11-08 15:18:54 -05001031
Theodore Ts'od444c3c2009-05-01 13:44:33 -04001032 /* ialloc */
1033 ext4_group_t i_last_alloc_group;
1034
1035 /* allocation reservation info for delalloc */
Theodore Ts'o57042652011-09-09 18:56:51 -04001036 /* In case of bigalloc, these refer to clusters rather than blocks */
Theodore Ts'od444c3c2009-05-01 13:44:33 -04001037 unsigned int i_reserved_data_blocks;
1038 unsigned int i_reserved_meta_blocks;
1039 unsigned int i_allocated_meta_blocks;
Theodore Ts'o01f49d02011-01-10 12:13:03 -05001040 ext4_lblk_t i_da_metadata_calc_last_lblock;
Theodore Ts'o9d0be502010-01-01 02:41:30 -05001041 int i_da_metadata_calc_len;
Theodore Ts'od444c3c2009-05-01 13:44:33 -04001042
1043 /* on-disk additional length */
1044 __u16 i_extra_isize;
1045
Tao Ma67cf5b02012-12-10 14:04:46 -05001046 /* Indicate the inline data space. */
1047 u16 i_inline_off;
1048 u16 i_inline_size;
1049
Dmitry Monakhova9e7f442009-12-14 15:21:14 +03001050#ifdef CONFIG_QUOTA
1051 /* quota space reservation, managed internally by quota code */
1052 qsize_t i_reserved_quota;
1053#endif
Mingming Cao8d5d02e2009-09-28 15:48:29 -04001054
Jan Kara2e8fa542013-06-04 14:21:02 -04001055 /* Lock protecting lists below */
Jiaying Zhang744692d2010-03-04 16:14:02 -05001056 spinlock_t i_completed_io_lock;
Jan Kara2e8fa542013-06-04 14:21:02 -04001057 /*
1058 * Completed IOs that need unwritten extents handling and have
1059 * transaction reserved
1060 */
1061 struct list_head i_rsv_conversion_list;
Jan Kara2e8fa542013-06-04 14:21:02 -04001062 struct work_struct i_rsv_conversion_work;
Jan Kara600be302016-03-08 23:39:21 -05001063 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
Theodore Ts'o8a2005d2011-01-10 12:13:42 -05001064
1065 spinlock_t i_block_reservation_lock;
Jan Karab436b9b2009-12-08 23:51:10 -05001066
1067 /*
1068 * Transactions that contain inode's metadata needed to complete
1069 * fsync and fdatasync, respectively.
1070 */
1071 tid_t i_sync_tid;
1072 tid_t i_datasync_tid;
Darrick J. Wong814525f2012-04-29 18:31:10 -04001073
Jan Kara96c7e0d2014-09-29 14:58:25 +02001074#ifdef CONFIG_QUOTA
1075 struct dquot *i_dquot[MAXQUOTAS];
1076#endif
1077
Darrick J. Wong814525f2012-04-29 18:31:10 -04001078 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1079 __u32 i_csum_seed;
Michael Halcrowb30ab0e2015-04-12 00:43:56 -04001080
Li Xi040cb372016-01-08 16:01:21 -05001081 kprojid_t i_projid;
Theodore Ts'od444c3c2009-05-01 13:44:33 -04001082};
1083
1084/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001085 * File system states
1086 */
Mingming Cao617ba132006-10-11 01:20:53 -07001087#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1088#define EXT4_ERROR_FS 0x0002 /* Errors detected */
1089#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001090
1091/*
Theodore Tso469108f2008-02-10 01:11:44 -05001092 * Misc. filesystem flags
1093 */
1094#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1095#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1096#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1097
1098/*
Lukas Czerner68911002013-04-03 22:12:52 -04001099 * Mount flags set via mount options or defaults
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001100 */
Mingming Cao617ba132006-10-11 01:20:53 -07001101#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1102#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1103#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1104#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1105#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
Theodore Ts'o39ef17f2012-03-03 17:56:23 -05001106#define EXT4_MOUNT_ERRORS_MASK 0x00070
Mingming Cao617ba132006-10-11 01:20:53 -07001107#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1108#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
Ross Zwisler923ae0f2015-02-16 15:59:38 -08001109#ifdef CONFIG_FS_DAX
1110#define EXT4_MOUNT_DAX 0x00200 /* Direct Access */
1111#else
1112#define EXT4_MOUNT_DAX 0
1113#endif
Mingming Cao617ba132006-10-11 01:20:53 -07001114#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1115#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1116#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1117#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1118#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1119#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1120#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1121#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
Theodore Ts'oafd46722009-03-16 23:12:23 -04001122#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
Mingming Cao617ba132006-10-11 01:20:53 -07001123#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
Jan Kara49da9392016-09-05 23:08:16 -04001124#define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1125#define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1126 * enable enforcement for hidden
1127 * quota files */
1128#define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1129 * enforcement for hidden quota
1130 * files */
1131#define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1132 * enforcement */
Jiaying Zhang744692d2010-03-04 16:14:02 -05001133#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
Linus Torvaldsd4da6c92009-11-02 10:15:27 -08001134#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
Girish Shilamkar818d2762008-01-28 23:58:27 -05001135#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
Alex Tomas64769242008-07-11 19:27:31 -04001136#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001137#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001138#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
Eric Sandeen5328e632009-11-19 14:25:42 -05001139#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
Lukas Czernerbfff6872010-10-27 21:30:05 -04001140#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001141
Lukas Czerner68911002013-04-03 22:12:52 -04001142/*
1143 * Mount flags set either automatically (could not be set by mount option)
1144 * based on per file system feature or property or in special cases such as
1145 * distinguishing between explicit mount option definition and default.
1146 */
Theodore Ts'o56889782011-09-03 18:22:38 -04001147#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1148 specified delalloc */
Lukas Czerner68911002013-04-03 22:12:52 -04001149#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1150 size of blocksize * 8
1151 blocks */
Theodore Ts'oed3654e2014-03-24 14:09:06 -04001152#define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1153 file systems */
Theodore Ts'o56889782011-09-03 18:22:38 -04001154
Dmitry Monakhov1e381f62015-10-18 23:50:26 -04001155#define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1156 specified journal checksum */
1157
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05001158#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1159 ~EXT4_MOUNT_##opt
1160#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1161 EXT4_MOUNT_##opt
Mingming Cao617ba132006-10-11 01:20:53 -07001162#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1163 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001164
Theodore Ts'oa2595b82010-12-15 20:30:48 -05001165#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1166 ~EXT4_MOUNT2_##opt
1167#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1168 EXT4_MOUNT2_##opt
1169#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1170 EXT4_MOUNT2_##opt)
1171
Akinobu Mita597d5082011-12-28 20:32:07 -05001172#define ext4_test_and_set_bit __test_and_set_bit_le
1173#define ext4_set_bit __set_bit_le
Mingming Cao617ba132006-10-11 01:20:53 -07001174#define ext4_set_bit_atomic ext2_set_bit_atomic
Akinobu Mita597d5082011-12-28 20:32:07 -05001175#define ext4_test_and_clear_bit __test_and_clear_bit_le
1176#define ext4_clear_bit __clear_bit_le
Mingming Cao617ba132006-10-11 01:20:53 -07001177#define ext4_clear_bit_atomic ext2_clear_bit_atomic
Akinobu Mita50e01682011-03-23 16:42:07 -07001178#define ext4_test_bit test_bit_le
Akinobu Mita50e01682011-03-23 16:42:07 -07001179#define ext4_find_next_zero_bit find_next_zero_bit_le
1180#define ext4_find_next_bit find_next_bit_le
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001181
Yongqiang Yangc3e94d12011-07-26 22:05:53 -04001182extern void ext4_set_bits(void *bm, int cur, int len);
1183
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001184/*
1185 * Maximal mount counts between two filesystem checks
1186 */
Mingming Cao617ba132006-10-11 01:20:53 -07001187#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1188#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001189
1190/*
1191 * Behaviour when detecting errors
1192 */
Mingming Cao617ba132006-10-11 01:20:53 -07001193#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1194#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1195#define EXT4_ERRORS_PANIC 3 /* Panic */
1196#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001197
Darrick J. Wonge6153912012-04-29 18:23:10 -04001198/* Metadata checksum algorithm codes */
1199#define EXT4_CRC32C_CHKSUM 1
1200
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001201/*
1202 * Structure of the super block
1203 */
Mingming Cao617ba132006-10-11 01:20:53 -07001204struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001205/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001206 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001207 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1208 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001209/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1210 __le32 s_first_data_block; /* First Data Block */
1211 __le32 s_log_block_size; /* Block size */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001212 __le32 s_log_cluster_size; /* Allocation cluster size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001213/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001214 __le32 s_clusters_per_group; /* # Clusters per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001215 __le32 s_inodes_per_group; /* # Inodes per group */
1216 __le32 s_mtime; /* Mount time */
1217/*30*/ __le32 s_wtime; /* Write time */
1218 __le16 s_mnt_count; /* Mount count */
1219 __le16 s_max_mnt_count; /* Maximal mount count */
1220 __le16 s_magic; /* Magic signature */
1221 __le16 s_state; /* File system state */
1222 __le16 s_errors; /* Behaviour when detecting errors */
1223 __le16 s_minor_rev_level; /* minor revision level */
1224/*40*/ __le32 s_lastcheck; /* time of last check */
1225 __le32 s_checkinterval; /* max. time between checks */
1226 __le32 s_creator_os; /* OS */
1227 __le32 s_rev_level; /* Revision level */
1228/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1229 __le16 s_def_resgid; /* Default gid for reserved blocks */
1230 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001231 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001232 *
1233 * Note: the difference between the compatible feature set and
1234 * the incompatible feature set is that if there is a bit set
1235 * in the incompatible feature set that the kernel doesn't
1236 * know about, it should refuse to mount the filesystem.
1237 *
1238 * e2fsck's requirements are more strict; if it doesn't know
1239 * about a feature in either the compatible or incompatible
1240 * feature set, it must abort and not try to meddle with
1241 * things it doesn't understand...
1242 */
1243 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001244 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001245 __le16 s_block_group_nr; /* block group # of this superblock */
1246 __le32 s_feature_compat; /* compatible feature set */
1247/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1248 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1249/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1250/*78*/ char s_volume_name[16]; /* volume name */
1251/*88*/ char s_last_mounted[64]; /* directory where last mounted */
1252/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1253 /*
1254 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -07001255 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001256 */
1257 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1258 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1259 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1260 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001261 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001262 */
1263/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1264/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1265 __le32 s_journal_dev; /* device number of journal file */
1266 __le32 s_last_orphan; /* start of list of inodes to delete */
1267 __le32 s_hash_seed[4]; /* HTREE hash seed */
1268 __u8 s_def_hash_version; /* Default hash version to use */
Theodore Ts'o89eeddf2010-07-27 11:56:04 -04001269 __u8 s_jnl_backup_type;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001270 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001271/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001272 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001273 __le32 s_mkfs_time; /* When the filesystem was created */
1274 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1275 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1276/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1277 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1278 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -04001279 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1280 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1281 __le32 s_flags; /* Miscellaneous flags */
1282 __le16 s_raid_stride; /* RAID stride */
Johann Lombardic5e06d12011-05-24 18:31:25 -04001283 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -04001284 __le64 s_mmp_block; /* Block for multi-mount protection */
1285 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001286 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
Darrick J. Wonge6153912012-04-29 18:23:10 -04001287 __u8 s_checksum_type; /* metadata checksum algorithm used */
Theodore Ts'of542fbe2015-04-11 07:44:12 -04001288 __u8 s_encryption_level; /* versioning level for encryption */
1289 __u8 s_reserved_pad; /* Padding to next 32bits */
Theodore Ts'oafc32f72009-02-28 19:39:58 -05001290 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
Theodore Ts'o4a9cdec2010-06-29 11:00:23 -04001291 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1292 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1293 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1294 snapshot's future use */
1295 __le32 s_snapshot_list; /* inode number of the head of the
1296 on-disk snapshot list */
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04001297#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1298 __le32 s_error_count; /* number of fs errors */
1299 __le32 s_first_error_time; /* first time an error happened */
1300 __le32 s_first_error_ino; /* inode involved in first error */
1301 __le64 s_first_error_block; /* block involved of first error */
1302 __u8 s_first_error_func[32]; /* function where the error happened */
1303 __le32 s_first_error_line; /* line number where error happened */
1304 __le32 s_last_error_time; /* most recent time of an error */
1305 __le32 s_last_error_ino; /* inode involved in last error */
1306 __le32 s_last_error_line; /* line number where error happened */
1307 __le64 s_last_error_block; /* block involved of last error */
1308 __u8 s_last_error_func[32]; /* function where the error happened */
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001309#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1310 __u8 s_mount_opts[64];
Theodore Ts'o281b5992011-09-09 18:34:51 -04001311 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1312 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1313 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
Darrick J. Wong1beeef12014-05-12 10:16:06 -04001314 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
Theodore Ts'o3edc18d2015-01-19 16:00:58 -05001315 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
Theodore Ts'of542fbe2015-04-11 07:44:12 -04001316 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1317 __le32 s_lpf_ino; /* Location of the lost+found inode */
Theodore Ts'o8b4953e2015-10-17 16:15:18 -04001318 __le32 s_prj_quota_inum; /* inode for tracking project quota */
Darrick J. Wong8c81bd82015-10-17 16:16:02 -04001319 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1320 __le32 s_reserved[98]; /* Padding to the end of the block */
Darrick J. Wonge6153912012-04-29 18:23:10 -04001321 __le32 s_checksum; /* crc32c(superblock) */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001322};
1323
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04001324#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1325
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001326#ifdef __KERNEL__
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001327
1328/*
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001329 * run-time mount flags
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001330 */
Theodore Ts'o6ddb2442015-04-16 01:56:00 -04001331#define EXT4_MF_MNTDIR_SAMPLED 0x0001
1332#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1333#define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004
1334
1335#ifdef CONFIG_EXT4_FS_ENCRYPTION
1336#define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1337 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1338#else
1339#define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1340#endif
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001341
Jan Karaa2d4a642014-09-11 11:15:15 -04001342/* Number of quota types we support */
Li Xi689c9582016-01-08 16:01:22 -05001343#define EXT4_MAXQUOTAS 3
Jan Karaa2d4a642014-09-11 11:15:15 -04001344
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001345#ifdef CONFIG_EXT4_FS_ENCRYPTION
1346#define EXT4_KEY_DESC_PREFIX "ext4:"
1347#define EXT4_KEY_DESC_PREFIX_SIZE 5
1348#endif
1349
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001350/*
1351 * fourth extended-fs super-block data in memory
1352 */
1353struct ext4_sb_info {
1354 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1355 unsigned long s_inodes_per_block;/* Number of inodes per block */
1356 unsigned long s_blocks_per_group;/* Number of blocks in a group */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001357 unsigned long s_clusters_per_group; /* Number of clusters in a group */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001358 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1359 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1360 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1361 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1362 ext4_group_t s_groups_count; /* Number of groups in the fs */
Eric Sandeenfb0a3872009-09-16 14:45:10 -04001363 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
Theodore Ts'o952fc182012-07-09 16:27:05 -04001364 unsigned long s_overhead; /* # of fs overhead clusters */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001365 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1366 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001367 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1368 struct buffer_head * s_sbh; /* Buffer containing the super block */
1369 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1370 struct buffer_head **s_group_desc;
Theodore Ts'o7f4520c2009-06-13 10:09:41 -04001371 unsigned int s_mount_opt;
Theodore Ts'oa2595b82010-12-15 20:30:48 -05001372 unsigned int s_mount_opt2;
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001373 unsigned int s_mount_flags;
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001374 unsigned int s_def_mount_opt;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001375 ext4_fsblk_t s_sb_block;
Lukas Czerner27dd4382013-04-09 22:11:22 -04001376 atomic64_t s_resv_clusters;
Eric W. Biederman08cefc72012-02-07 15:41:49 -08001377 kuid_t s_resuid;
1378 kgid_t s_resgid;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001379 unsigned short s_mount_state;
1380 unsigned short s_pad;
1381 int s_addr_per_block_bits;
1382 int s_desc_per_block_bits;
1383 int s_inode_size;
1384 int s_first_ino;
1385 unsigned int s_inode_readahead_blks;
Andreas Dilger11013912009-06-13 11:45:35 -04001386 unsigned int s_inode_goal;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001387 spinlock_t s_next_gen_lock;
1388 u32 s_next_generation;
1389 u32 s_hash_seed[4];
1390 int s_def_hash_version;
1391 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
Theodore Ts'o57042652011-09-09 18:56:51 -04001392 struct percpu_counter s_freeclusters_counter;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001393 struct percpu_counter s_freeinodes_counter;
1394 struct percpu_counter s_dirs_counter;
Theodore Ts'o57042652011-09-09 18:56:51 -04001395 struct percpu_counter s_dirtyclusters_counter;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001396 struct blockgroup_lock *s_blockgroup_lock;
1397 struct proc_dir_entry *s_proc;
1398 struct kobject s_kobj;
1399 struct completion s_kobj_unregister;
Theodore Ts'o2c0544b2012-05-30 22:56:46 -04001400 struct super_block *s_sb;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001401
1402 /* Journaling */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001403 struct journal_s *s_journal;
1404 struct list_head s_orphan;
1405 struct mutex s_orphan_lock;
Yongqiang Yang8f82f842011-07-26 21:35:44 -04001406 unsigned long s_resize_flags; /* Flags indicating if there
1407 is a resizer */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001408 unsigned long s_commit_interval;
1409 u32 s_max_batch_time;
1410 u32 s_min_batch_time;
1411 struct block_device *journal_bdev;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001412#ifdef CONFIG_QUOTA
Jan Karaa2d4a642014-09-11 11:15:15 -04001413 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001414 int s_jquota_fmt; /* Format of quota to use */
1415#endif
1416 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001417 struct rb_root system_blks;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001418
1419#ifdef EXTENTS_STATS
1420 /* ext4 extents stats */
1421 unsigned long s_ext_min;
1422 unsigned long s_ext_max;
1423 unsigned long s_depth_max;
1424 spinlock_t s_ext_stats_lock;
1425 unsigned long s_ext_blocks;
1426 unsigned long s_ext_extents;
1427#endif
1428
1429 /* for buddy allocator */
1430 struct ext4_group_info ***s_group_info;
1431 struct inode *s_buddy_cache;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001432 spinlock_t s_md_lock;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001433 unsigned short *s_mb_offsets;
1434 unsigned int *s_mb_maxs;
Theodore Ts'o28623c22012-09-05 01:31:50 -04001435 unsigned int s_group_info_size;
Theodore Ts'od08854f2016-06-26 18:24:01 -04001436 unsigned int s_mb_free_pending;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001437
1438 /* tunables */
1439 unsigned long s_stripe;
1440 unsigned int s_mb_stream_request;
1441 unsigned int s_mb_max_to_scan;
1442 unsigned int s_mb_min_to_scan;
1443 unsigned int s_mb_stats;
1444 unsigned int s_mb_order2_reqs;
1445 unsigned int s_mb_group_prealloc;
Theodore Ts'odf981d02012-08-17 09:48:17 -04001446 unsigned int s_max_dir_size_kb;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001447 /* where last allocation was done - for stream allocation */
1448 unsigned long s_mb_last_group;
1449 unsigned long s_mb_last_start;
1450
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001451 /* stats for buddy allocator */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001452 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1453 atomic_t s_bal_success; /* we found long enough chunks */
1454 atomic_t s_bal_allocated; /* in blocks */
1455 atomic_t s_bal_ex_scanned; /* total extents scanned */
1456 atomic_t s_bal_goals; /* goal hits */
1457 atomic_t s_bal_breaks; /* too long searches */
1458 atomic_t s_bal_2orders; /* 2^order hits */
1459 spinlock_t s_bal_lock;
1460 unsigned long s_mb_buddies_generated;
1461 unsigned long long s_mb_generation_time;
1462 atomic_t s_mb_lost_chunks;
1463 atomic_t s_mb_preallocated;
1464 atomic_t s_mb_discarded;
Theodore Ts'o50797482009-09-18 13:34:02 -04001465 atomic_t s_lock_busy;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001466
1467 /* locality groups */
Tejun Heo003cb602010-02-02 14:39:01 +09001468 struct ext4_locality_group __percpu *s_locality_groups;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001469
1470 /* for write statistics */
1471 unsigned long s_sectors_written_start;
1472 u64 s_kbytes_written;
1473
Zheng Liu67a5da52012-08-17 09:54:17 -04001474 /* the size of zero-out chunk */
1475 unsigned int s_extent_max_zeroout_kb;
1476
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001477 unsigned int s_log_groups_per_flex;
1478 struct flex_groups *s_flex_groups;
Theodore Ts'o117fff12012-09-05 01:29:50 -04001479 ext4_group_t s_flex_groups_allocated;
Mingming Cao4c0425f2009-09-28 15:48:41 -04001480
Jan Kara2e8fa542013-06-04 14:21:02 -04001481 /* workqueue for reserved extent conversions (buffered io) */
1482 struct workqueue_struct *rsv_conversion_wq;
Theodore Ts'o66e61a92010-07-27 11:56:04 -04001483
1484 /* timer for periodic error stats printing */
1485 struct timer_list s_err_report;
Lukas Czernerbfff6872010-10-27 21:30:05 -04001486
1487 /* Lazy inode table initialization info */
1488 struct ext4_li_request *s_li_request;
1489 /* Wait multiplier for lazy initialization thread */
1490 unsigned int s_li_wait_mult;
Johann Lombardic5e06d12011-05-24 18:31:25 -04001491
1492 /* Kernel thread for multiple mount protection */
1493 struct task_struct *s_mmp_tsk;
Tao Ma3d56b8d2011-07-11 00:03:38 -04001494
1495 /* record the last minlen when FITRIM is called. */
1496 atomic_t s_last_trim_minblks;
Darrick J. Wong04419842012-04-29 18:27:10 -04001497
1498 /* Reference to checksum algorithm driver via cryptoapi */
1499 struct crypto_shash *s_chksum_driver;
Darrick J. Wonga9c473172012-04-29 18:29:10 -04001500
1501 /* Precomputed FS UUID checksum for seeding other checksums */
1502 __u32 s_csum_seed;
Zheng Liu74cd15c2013-02-18 00:32:55 -05001503
1504 /* Reclaim extents from extent status tree */
1505 struct shrinker s_es_shrinker;
Jan Karadd475922014-11-25 11:51:23 -05001506 struct list_head s_es_list; /* List of inodes with reclaimable extents */
Zheng Liuedaa53c2014-11-25 11:45:37 -05001507 long s_es_nr_inode;
Zheng Liueb68d0e2014-09-01 22:26:49 -04001508 struct ext4_es_stats s_es_stats;
Jan Kara7a2508e2016-02-22 22:35:22 -05001509 struct mb_cache *s_mb_cache;
Zheng Liuedaa53c2014-11-25 11:45:37 -05001510 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
Theodore Ts'oefbed4d2013-10-17 21:11:01 -04001511
1512 /* Ratelimit ext4 messages. */
1513 struct ratelimit_state s_err_ratelimit_state;
1514 struct ratelimit_state s_warning_ratelimit_state;
1515 struct ratelimit_state s_msg_ratelimit_state;
Daeho Jeongc8585c62016-04-25 23:22:35 -04001516
1517 /* Barrier between changing inodes' journal flags and writepages ops. */
1518 struct percpu_rw_semaphore s_journal_flag_rwsem;
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001519
1520 /* Encryption support */
1521#ifdef CONFIG_EXT4_FS_ENCRYPTION
1522 u8 key_prefix[EXT4_KEY_DESC_PREFIX_SIZE];
1523 u8 key_prefix_size;
1524#endif
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001525};
1526
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001527static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001528{
1529 return sb->s_fs_info;
1530}
Mingming Cao617ba132006-10-11 01:20:53 -07001531static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001532{
Mingming Cao617ba132006-10-11 01:20:53 -07001533 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001534}
1535
Kalpak Shahef7f3832007-07-18 09:15:20 -04001536static inline struct timespec ext4_current_time(struct inode *inode)
1537{
1538 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1539 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1540}
1541
Mingming Cao617ba132006-10-11 01:20:53 -07001542static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001543{
Mingming Cao617ba132006-10-11 01:20:53 -07001544 return ino == EXT4_ROOT_INO ||
Mingming Cao617ba132006-10-11 01:20:53 -07001545 (ino >= EXT4_FIRST_INO(sb) &&
1546 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001547}
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001548
1549/*
1550 * Inode dynamic state flags
1551 */
1552enum {
1553 EXT4_STATE_JDATA, /* journaled data exists */
1554 EXT4_STATE_NEW, /* inode is newly created */
1555 EXT4_STATE_XATTR, /* has in-inode xattrs */
1556 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1557 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1558 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1559 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
Frank Mayhar14ece102010-05-17 08:00:00 -04001560 EXT4_STATE_NEWENTRY, /* File just added to dir */
Dmitry Monakhov17335dc2012-09-29 00:41:21 -04001561 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1562 nolocking */
Tao Ma67cf5b02012-12-10 14:04:46 -05001563 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
Theodore Ts'o7869a4a2013-08-16 22:05:14 -04001564 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001565};
1566
Theodore Ts'o353eb832011-01-10 12:18:25 -05001567#define EXT4_INODE_BIT_FNS(name, field, offset) \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001568static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1569{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001570 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001571} \
1572static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1573{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001574 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001575} \
1576static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1577{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001578 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001579}
1580
Andreas Dilger3f61c0c2013-11-11 22:40:40 -05001581/* Add these declarations here only so that these functions can be
1582 * found by name. Otherwise, they are very hard to locate. */
1583static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1584static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1585static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
Theodore Ts'o353eb832011-01-10 12:18:25 -05001586EXT4_INODE_BIT_FNS(flag, flags, 0)
Andreas Dilger3f61c0c2013-11-11 22:40:40 -05001587
1588/* Add these declarations here only so that these functions can be
1589 * found by name. Otherwise, they are very hard to locate. */
1590static inline int ext4_test_inode_state(struct inode *inode, int bit);
1591static inline void ext4_set_inode_state(struct inode *inode, int bit);
1592static inline void ext4_clear_inode_state(struct inode *inode, int bit);
Theodore Ts'o353eb832011-01-10 12:18:25 -05001593#if (BITS_PER_LONG < 64)
1594EXT4_INODE_BIT_FNS(state, state_flags, 0)
1595
1596static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1597{
1598 (ei)->i_state_flags = 0;
1599}
1600#else
1601EXT4_INODE_BIT_FNS(state, flags, 32)
1602
1603static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1604{
1605 /* We depend on the fact that callers will set i_flags */
1606}
1607#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001608#else
Mingming Cao617ba132006-10-11 01:20:53 -07001609/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001610 * a kernel struct super_block. This will allow us to call the feature-test
1611 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -07001612#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001613#endif
1614
Michael Halcrowb30ab0e2015-04-12 00:43:56 -04001615/*
1616 * Returns true if the inode is inode is encrypted
1617 */
Mingming Cao617ba132006-10-11 01:20:53 -07001618#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001619
1620/*
1621 * Codes for operating systems
1622 */
Mingming Cao617ba132006-10-11 01:20:53 -07001623#define EXT4_OS_LINUX 0
1624#define EXT4_OS_HURD 1
1625#define EXT4_OS_MASIX 2
1626#define EXT4_OS_FREEBSD 3
1627#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001628
1629/*
1630 * Revision levels
1631 */
Mingming Cao617ba132006-10-11 01:20:53 -07001632#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1633#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001634
Mingming Cao617ba132006-10-11 01:20:53 -07001635#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1636#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001637
Mingming Cao617ba132006-10-11 01:20:53 -07001638#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001639
1640/*
1641 * Feature set definitions
1642 */
1643
Mingming Cao617ba132006-10-11 01:20:53 -07001644#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1645#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1646#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1647#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1648#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1649#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Darrick J. Wong1beeef12014-05-12 10:16:06 -04001650#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001651
Mingming Cao617ba132006-10-11 01:20:53 -07001652#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1653#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1654#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001655#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
Andreas Dilger717d50e2007-10-16 18:38:25 -04001656#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001657#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -04001658#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Aditya Kaliae812302011-05-24 19:00:39 -04001659#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
Theodore Ts'o281b5992011-09-09 18:34:51 -04001660#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
Darrick J. Wonge6153912012-04-29 18:23:10 -04001661/*
1662 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1663 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1664 * all other data structures' checksums. However, the METADATA_CSUM and
1665 * GDT_CSUM bits are mutually exclusive.
1666 */
Theodore Ts'o9b90e5e2012-01-04 22:01:53 -05001667#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
Darrick J. Wong2cb5cc82015-02-12 22:31:21 -05001668#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
Theodore Ts'o8b4953e2015-10-17 16:15:18 -04001669#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001670
Mingming Cao617ba132006-10-11 01:20:53 -07001671#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1672#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1673#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1674#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1675#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -07001676#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001677#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001678#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
Jose R. Santosce421582007-10-16 18:38:25 -04001679#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Theodore Ts'of710b4b2010-01-25 03:31:32 -05001680#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1681#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
Darrick J. Wong8c81bd82015-10-17 16:16:02 -04001682#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
Theodore Ts'o9b90e5e2012-01-04 22:01:53 -05001683#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
Tao Ma67cf5b02012-12-10 14:04:46 -05001684#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
Theodore Ts'o3edc18d2015-01-19 16:00:58 -05001685#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001686
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04001687#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1688static inline bool ext4_has_feature_##name(struct super_block *sb) \
1689{ \
1690 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1691 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1692} \
1693static inline void ext4_set_feature_##name(struct super_block *sb) \
1694{ \
1695 EXT4_SB(sb)->s_es->s_feature_compat |= \
1696 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1697} \
1698static inline void ext4_clear_feature_##name(struct super_block *sb) \
1699{ \
1700 EXT4_SB(sb)->s_es->s_feature_compat &= \
1701 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1702}
1703
1704#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1705static inline bool ext4_has_feature_##name(struct super_block *sb) \
1706{ \
1707 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1708 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1709} \
1710static inline void ext4_set_feature_##name(struct super_block *sb) \
1711{ \
1712 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1713 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1714} \
1715static inline void ext4_clear_feature_##name(struct super_block *sb) \
1716{ \
1717 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1718 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1719}
1720
1721#define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1722static inline bool ext4_has_feature_##name(struct super_block *sb) \
1723{ \
1724 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1725 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1726} \
1727static inline void ext4_set_feature_##name(struct super_block *sb) \
1728{ \
1729 EXT4_SB(sb)->s_es->s_feature_incompat |= \
1730 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1731} \
1732static inline void ext4_clear_feature_##name(struct super_block *sb) \
1733{ \
1734 EXT4_SB(sb)->s_es->s_feature_incompat &= \
1735 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1736}
1737
1738EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
1739EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
1740EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
1741EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
1742EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
1743EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
1744EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
1745
1746EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
1747EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
1748EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
1749EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
1750EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
1751EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
1752EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
1753EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
1754EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
1755EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
1756EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
1757EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
1758
1759EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
1760EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
1761EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
1762EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
1763EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
1764EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
1765EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
1766EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
1767EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
1768EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
1769EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
1770EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
1771EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
1772EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
1773EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
1774
Theodore Ts'o2035e772011-04-18 17:29:14 -04001775#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1776#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1777 EXT4_FEATURE_INCOMPAT_META_BG)
1778#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1779 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1780 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1781
1782#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1783#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1784 EXT4_FEATURE_INCOMPAT_RECOVER| \
1785 EXT4_FEATURE_INCOMPAT_META_BG)
1786#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1787 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1788 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1789
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04001790#define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
Mingming Cao617ba132006-10-11 01:20:53 -07001791#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1792 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -07001793 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001794 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -04001795 EXT4_FEATURE_INCOMPAT_64BIT| \
Johann Lombardic5e06d12011-05-24 18:31:25 -04001796 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
Theodore Ts'o6ddb2442015-04-16 01:56:00 -04001797 EXT4_FEATURE_INCOMPAT_MMP | \
1798 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
Darrick J. Wong8c81bd82015-10-17 16:16:02 -04001799 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1800 EXT4_FEATURE_INCOMPAT_CSUM_SEED)
Mingming Cao617ba132006-10-11 01:20:53 -07001801#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1802 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -04001803 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001804 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -04001805 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001806 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
Theodore Ts'o6f16b602011-09-09 19:06:51 -04001807 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
Darrick J. Wonge93376c2012-05-27 08:12:42 -04001808 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
Aditya Kali7c319d32012-07-22 20:21:31 -04001809 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
Li Xi040cb372016-01-08 16:01:21 -05001810 EXT4_FEATURE_RO_COMPAT_QUOTA |\
1811 EXT4_FEATURE_RO_COMPAT_PROJECT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001812
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04001813#define EXTN_FEATURE_FUNCS(ver) \
1814static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1815{ \
1816 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1817 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1818} \
1819static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1820{ \
1821 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1822 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1823} \
1824static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1825{ \
1826 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1827 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1828}
1829
1830EXTN_FEATURE_FUNCS(2)
1831EXTN_FEATURE_FUNCS(3)
1832EXTN_FEATURE_FUNCS(4)
1833
1834static inline bool ext4_has_compat_features(struct super_block *sb)
1835{
1836 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1837}
1838static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1839{
1840 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1841}
1842static inline bool ext4_has_incompat_features(struct super_block *sb)
1843{
1844 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1845}
1846
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001847/*
1848 * Default values for user and/or group using reserved blocks
1849 */
Mingming Cao617ba132006-10-11 01:20:53 -07001850#define EXT4_DEF_RESUID 0
1851#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001852
Li Xi040cb372016-01-08 16:01:21 -05001853/*
1854 * Default project ID
1855 */
1856#define EXT4_DEF_PROJID 0
1857
Theodore Ts'o240799c2008-10-09 23:53:47 -04001858#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1859
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001860/*
1861 * Default mount options
1862 */
Mingming Cao617ba132006-10-11 01:20:53 -07001863#define EXT4_DEFM_DEBUG 0x0001
1864#define EXT4_DEFM_BSDGROUPS 0x0002
1865#define EXT4_DEFM_XATTR_USER 0x0004
1866#define EXT4_DEFM_ACL 0x0008
1867#define EXT4_DEFM_UID16 0x0010
1868#define EXT4_DEFM_JMODE 0x0060
1869#define EXT4_DEFM_JMODE_DATA 0x0020
1870#define EXT4_DEFM_JMODE_ORDERED 0x0040
1871#define EXT4_DEFM_JMODE_WBACK 0x0060
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001872#define EXT4_DEFM_NOBARRIER 0x0100
1873#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1874#define EXT4_DEFM_DISCARD 0x0400
1875#define EXT4_DEFM_NODELALLOC 0x0800
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001876
1877/*
Theodore Ts'o30773842009-01-03 20:27:38 -05001878 * Default journal batch times
1879 */
1880#define EXT4_DEF_MIN_BATCH_TIME 0
1881#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1882
1883/*
Theodore Ts'oa4912122009-03-12 12:18:34 -04001884 * Minimum number of groups in a flexgroup before we separate out
1885 * directories into the first block group of a flexgroup
1886 */
1887#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1888
1889/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001890 * Structure of a directory entry
1891 */
Mingming Cao617ba132006-10-11 01:20:53 -07001892#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001893
Mingming Cao617ba132006-10-11 01:20:53 -07001894struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001895 __le32 inode; /* Inode number */
1896 __le16 rec_len; /* Directory entry length */
1897 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -07001898 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001899};
1900
1901/*
Mingming Cao617ba132006-10-11 01:20:53 -07001902 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001903 * stored in intel byte order, and the name_len field could never be
1904 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1905 * file_type field.
1906 */
Mingming Cao617ba132006-10-11 01:20:53 -07001907struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001908 __le32 inode; /* Inode number */
1909 __le16 rec_len; /* Directory entry length */
1910 __u8 name_len; /* Name length */
1911 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -07001912 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001913};
1914
1915/*
Darrick J. Wonge6153912012-04-29 18:23:10 -04001916 * This is a bogus directory entry at the end of each leaf block that
1917 * records checksums.
1918 */
1919struct ext4_dir_entry_tail {
1920 __le32 det_reserved_zero1; /* Pretend to be unused */
1921 __le16 det_rec_len; /* 12 */
1922 __u8 det_reserved_zero2; /* Zero name length */
1923 __u8 det_reserved_ft; /* 0xDE, fake file type */
1924 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1925};
1926
Tao Ma3c47d542012-12-10 14:05:59 -05001927#define EXT4_DIRENT_TAIL(block, blocksize) \
1928 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1929 ((blocksize) - \
1930 sizeof(struct ext4_dir_entry_tail))))
1931
Darrick J. Wonge6153912012-04-29 18:23:10 -04001932/*
Mingming Cao617ba132006-10-11 01:20:53 -07001933 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001934 * other bits are reserved for now.
1935 */
Mingming Cao617ba132006-10-11 01:20:53 -07001936#define EXT4_FT_UNKNOWN 0
1937#define EXT4_FT_REG_FILE 1
1938#define EXT4_FT_DIR 2
1939#define EXT4_FT_CHRDEV 3
1940#define EXT4_FT_BLKDEV 4
1941#define EXT4_FT_FIFO 5
1942#define EXT4_FT_SOCK 6
1943#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001944
Mingming Cao617ba132006-10-11 01:20:53 -07001945#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001946
Darrick J. Wonge6153912012-04-29 18:23:10 -04001947#define EXT4_FT_DIR_CSUM 0xDE
1948
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001949/*
Mingming Cao617ba132006-10-11 01:20:53 -07001950 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001951 *
1952 * NOTE: It must be a multiple of 4
1953 */
Mingming Cao617ba132006-10-11 01:20:53 -07001954#define EXT4_DIR_PAD 4
1955#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1956#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1957 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -05001958#define EXT4_MAX_REC_LEN ((1<<16)-1)
1959
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001960/*
Eric Sandeen0cfc9252010-08-05 01:46:37 -04001961 * If we ever get support for fs block sizes > page_size, we'll need
1962 * to remove the #if statements in the next two functions...
1963 */
1964static inline unsigned int
1965ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1966{
1967 unsigned len = le16_to_cpu(dlen);
1968
Kirill A. Shutemovea1754a2016-04-01 15:29:48 +03001969#if (PAGE_SIZE >= 65536)
Eric Sandeen0cfc9252010-08-05 01:46:37 -04001970 if (len == EXT4_MAX_REC_LEN || len == 0)
1971 return blocksize;
1972 return (len & 65532) | ((len & 3) << 16);
1973#else
1974 return len;
1975#endif
1976}
1977
1978static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1979{
1980 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1981 BUG();
Kirill A. Shutemovea1754a2016-04-01 15:29:48 +03001982#if (PAGE_SIZE >= 65536)
Eric Sandeen0cfc9252010-08-05 01:46:37 -04001983 if (len < 65536)
1984 return cpu_to_le16(len);
1985 if (len == blocksize) {
1986 if (blocksize == 65536)
1987 return cpu_to_le16(EXT4_MAX_REC_LEN);
1988 else
1989 return cpu_to_le16(0);
1990 }
1991 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1992#else
1993 return cpu_to_le16(len);
1994#endif
1995}
1996
1997/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001998 * Hash Tree Directory indexing
1999 * (c) Daniel Phillips, 2001
2000 */
2001
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002002#define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04002003 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
Mingming Cao617ba132006-10-11 01:20:53 -07002004#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
2005#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002006
2007/* Legal values for the dx_root hash_version field: */
2008
2009#define DX_HASH_LEGACY 0
2010#define DX_HASH_HALF_MD4 1
2011#define DX_HASH_TEA 2
Theodore Ts'of99b2582008-10-28 13:21:44 -04002012#define DX_HASH_LEGACY_UNSIGNED 3
2013#define DX_HASH_HALF_MD4_UNSIGNED 4
2014#define DX_HASH_TEA_UNSIGNED 5
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002015
Darrick J. Wong04419842012-04-29 18:27:10 -04002016static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2017 const void *address, unsigned int length)
2018{
2019 struct {
2020 struct shash_desc shash;
Theodore Ts'o3108b542012-07-22 20:25:31 -04002021 char ctx[4];
Darrick J. Wong04419842012-04-29 18:27:10 -04002022 } desc;
2023 int err;
2024
Theodore Ts'o3108b542012-07-22 20:25:31 -04002025 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2026
Darrick J. Wong04419842012-04-29 18:27:10 -04002027 desc.shash.tfm = sbi->s_chksum_driver;
2028 desc.shash.flags = 0;
2029 *(u32 *)desc.ctx = crc;
2030
2031 err = crypto_shash_update(&desc.shash, address, length);
2032 BUG_ON(err);
2033
2034 return *(u32 *)desc.ctx;
2035}
2036
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002037#ifdef __KERNEL__
2038
2039/* hash info structure used by the directory hash */
2040struct dx_hash_info
2041{
2042 u32 hash;
2043 u32 minor_hash;
2044 int hash_version;
2045 u32 *seed;
2046};
2047
Fan Yongd1f52732012-03-18 22:44:40 -04002048
2049/* 32 and 64 bit signed EOF for dx directories */
2050#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2051#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2052
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002053
2054/*
Mingming Cao617ba132006-10-11 01:20:53 -07002055 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002056 */
2057#define HASH_NB_ALWAYS 1
2058
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002059struct ext4_filename {
2060 const struct qstr *usr_fname;
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002061 struct fscrypt_str disk_name;
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002062 struct dx_hash_info hinfo;
2063#ifdef CONFIG_EXT4_FS_ENCRYPTION
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002064 struct fscrypt_str crypto_buf;
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002065#endif
2066};
2067
2068#define fname_name(p) ((p)->disk_name.name)
2069#define fname_len(p) ((p)->disk_name.len)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002070
2071/*
2072 * Describe an inode's exact location on disk and in memory
2073 */
Mingming Cao617ba132006-10-11 01:20:53 -07002074struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002075{
2076 struct buffer_head *bh;
2077 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -05002078 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002079};
2080
Mingming Cao617ba132006-10-11 01:20:53 -07002081static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002082{
Mingming Cao617ba132006-10-11 01:20:53 -07002083 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002084}
2085
2086/*
2087 * This structure is stuffed into the struct file's private_data field
2088 * for directories. It is where we put information so that we can do
2089 * readdir operations in hash tree order.
2090 */
2091struct dir_private_info {
2092 struct rb_root root;
2093 struct rb_node *curr_node;
2094 struct fname *extra_fname;
2095 loff_t last_pos;
2096 __u32 curr_hash;
2097 __u32 curr_minor_hash;
2098 __u32 next_hash;
2099};
2100
2101/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -07002102static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -05002103ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002104{
Mingming Cao617ba132006-10-11 01:20:53 -07002105 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2106 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002107}
2108
2109/*
2110 * Special error return code only used by dx_probe() and its callers.
2111 */
Theodore Ts'o36de9282014-08-23 17:47:19 -04002112#define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002113
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07002114/*
Lukas Czernerbfff6872010-10-27 21:30:05 -04002115 * Timeout and state flag for lazy initialization inode thread.
2116 */
2117#define EXT4_DEF_LI_WAIT_MULT 10
2118#define EXT4_DEF_LI_MAX_START_DELAY 5
2119#define EXT4_LAZYINIT_QUIT 0x0001
2120#define EXT4_LAZYINIT_RUNNING 0x0002
2121
2122/*
2123 * Lazy inode table initialization info
2124 */
2125struct ext4_lazy_init {
2126 unsigned long li_state;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002127 struct list_head li_request_list;
2128 struct mutex li_list_mtx;
2129};
2130
2131struct ext4_li_request {
2132 struct super_block *lr_super;
2133 struct ext4_sb_info *lr_sbi;
2134 ext4_group_t lr_next_group;
2135 struct list_head lr_request;
2136 unsigned long lr_next_sched;
2137 unsigned long lr_timeout;
2138};
2139
Lukas Czerner857ac882010-10-27 21:30:05 -04002140struct ext4_features {
2141 struct kobject f_kobj;
2142 struct completion f_kobj_unregister;
2143};
2144
Lukas Czernerbfff6872010-10-27 21:30:05 -04002145/*
Johann Lombardic5e06d12011-05-24 18:31:25 -04002146 * This structure will be used for multiple mount protection. It will be
2147 * written into the block number saved in the s_mmp_block field in the
2148 * superblock. Programs that check MMP should assume that if
2149 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2150 * to use the filesystem, regardless of how old the timestamp is.
2151 */
2152#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2153#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2154#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2155#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2156
2157struct mmp_struct {
2158 __le32 mmp_magic; /* Magic number for MMP */
2159 __le32 mmp_seq; /* Sequence no. updated periodically */
2160
2161 /*
2162 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2163 * purposes and do not affect the correctness of the algorithm
2164 */
2165 __le64 mmp_time; /* Time last updated */
2166 char mmp_nodename[64]; /* Node which last updated MMP block */
2167 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2168
2169 /*
2170 * mmp_check_interval is used to verify if the MMP block has been
2171 * updated on the block device. The value is updated based on the
2172 * maximum time to write the MMP block during an update cycle.
2173 */
2174 __le16 mmp_check_interval;
2175
2176 __le16 mmp_pad1;
Darrick J. Wonge6153912012-04-29 18:23:10 -04002177 __le32 mmp_pad2[226];
2178 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
Johann Lombardic5e06d12011-05-24 18:31:25 -04002179};
2180
2181/* arguments passed to the mmp thread */
2182struct mmpd_data {
2183 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2184 struct super_block *sb; /* super block of the fs */
2185};
2186
2187/*
2188 * Check interval multiplier
2189 * The MMP block is written every update interval and initially checked every
2190 * update interval x the multiplier (the value is then adapted based on the
2191 * write latency). The reason is that writes can be delayed under load and we
2192 * don't want readers to incorrectly assume that the filesystem is no longer
2193 * in use.
2194 */
2195#define EXT4_MMP_CHECK_MULT 2UL
2196
2197/*
2198 * Minimum interval for MMP checking in seconds.
2199 */
2200#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2201
2202/*
2203 * Maximum interval for MMP checking in seconds.
2204 */
2205#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2206
2207/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002208 * Function prototypes
2209 */
2210
2211/*
2212 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -07002213 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002214 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002215# define NORET_TYPE /**/
2216# define ATTRIB_NORET __attribute__((noreturn))
2217# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002218
Theodore Ts'o498e5f22008-11-05 00:14:04 -05002219/* bitmap.c */
Theodore Ts'of6fb99c2012-06-30 19:14:57 -04002220extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
Darrick J. Wong41a246d2012-04-29 18:33:10 -04002221void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2222 struct ext4_group_desc *gdp,
2223 struct buffer_head *bh, int sz);
2224int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2225 struct ext4_group_desc *gdp,
2226 struct buffer_head *bh, int sz);
Darrick J. Wongfa77dcf2012-04-29 18:35:10 -04002227void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2228 struct ext4_group_desc *gdp,
Tao Ma79f1ba42012-10-22 00:34:32 -04002229 struct buffer_head *bh);
Darrick J. Wongfa77dcf2012-04-29 18:35:10 -04002230int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2231 struct ext4_group_desc *gdp,
Tao Ma79f1ba42012-10-22 00:34:32 -04002232 struct buffer_head *bh);
Theodore Ts'o498e5f22008-11-05 00:14:04 -05002233
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002234/* balloc.c */
Lukas Czernerbd862982013-04-03 23:32:34 -04002235extern void ext4_get_group_no_and_offset(struct super_block *sb,
2236 ext4_fsblk_t blocknr,
2237 ext4_group_t *blockgrpp,
2238 ext4_grpblk_t *offsetp);
2239extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2240 ext4_fsblk_t block);
2241
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07002242extern unsigned int ext4_block_group(struct super_block *sb,
2243 ext4_fsblk_t blocknr);
2244extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2245 ext4_fsblk_t blocknr);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05002246extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2247extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2248 ext4_group_t group);
Aneesh Kumar K.V7061eba2008-07-11 19:27:31 -04002249extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
Allison Henderson55f020d2011-05-25 07:41:26 -04002250 ext4_fsblk_t goal,
2251 unsigned int flags,
2252 unsigned long *count,
2253 int *errp);
Theodore Ts'oe7d5f312011-09-09 19:14:51 -04002254extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2255 s64 nclusters, unsigned int flags);
Theodore Ts'o5dee5432011-09-09 19:10:51 -04002256extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002257extern void ext4_check_blocks_bitmap(struct super_block *);
Mingming Cao617ba132006-10-11 01:20:53 -07002258extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Avantika Mathurfd2d4292008-01-28 23:58:27 -05002259 ext4_group_t block_group,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002260 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -07002261extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
Theodore Ts'o813e5722012-02-20 17:52:46 -05002262
2263extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2264 ext4_group_t block_group);
2265extern int ext4_wait_block_bitmap(struct super_block *sb,
2266 ext4_group_t block_group,
2267 struct buffer_head *bh);
2268extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2269 ext4_group_t block_group);
Theodore Ts'ocff1dfd72011-09-09 19:12:51 -04002270extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2271 ext4_group_t block_group,
2272 struct ext4_group_desc *gdp);
Eric Sandeenf86186b2011-06-28 10:01:31 -04002273ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002274
Michael Halcrowb30ab0e2015-04-12 00:43:56 -04002275static inline int ext4_sb_has_crypto(struct super_block *sb)
2276{
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002277 return ext4_has_feature_encrypt(sb);
Michael Halcrowb30ab0e2015-04-12 00:43:56 -04002278}
Michael Halcrowb30ab0e2015-04-12 00:43:56 -04002279
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002280static inline bool ext4_encrypted_inode(struct inode *inode)
Michael Halcrowd5d0e8c2015-04-12 00:56:17 -04002281{
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002282 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
Michael Halcrowd5d0e8c2015-04-12 00:56:17 -04002283}
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002284
2285#ifdef CONFIG_EXT4_FS_ENCRYPTION
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002286static inline int ext4_fname_setup_filename(struct inode *dir,
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002287 const struct qstr *iname,
2288 int lookup, struct ext4_filename *fname)
2289{
2290 struct fscrypt_name name;
2291 int err;
2292
2293 memset(fname, 0, sizeof(struct ext4_filename));
2294
2295 err = fscrypt_setup_filename(dir, iname, lookup, &name);
2296
2297 fname->usr_fname = name.usr_fname;
2298 fname->disk_name = name.disk_name;
2299 fname->hinfo.hash = name.hash;
2300 fname->hinfo.minor_hash = name.minor_hash;
2301 fname->crypto_buf = name.crypto_buf;
2302 return err;
2303}
2304
2305static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2306{
2307 struct fscrypt_name name;
2308
2309 name.crypto_buf = fname->crypto_buf;
2310 fscrypt_free_filename(&name);
2311
2312 fname->crypto_buf.name = NULL;
2313 fname->usr_fname = NULL;
2314 fname->disk_name.name = NULL;
2315}
2316#else
2317static inline int ext4_fname_setup_filename(struct inode *dir,
2318 const struct qstr *iname,
2319 int lookup, struct ext4_filename *fname)
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002320{
2321 fname->usr_fname = iname;
2322 fname->disk_name.name = (unsigned char *) iname->name;
2323 fname->disk_name.len = iname->len;
2324 return 0;
2325}
2326static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002327
2328#define fscrypt_set_d_op(i)
2329#define fscrypt_get_ctx fscrypt_notsupp_get_ctx
2330#define fscrypt_release_ctx fscrypt_notsupp_release_ctx
2331#define fscrypt_encrypt_page fscrypt_notsupp_encrypt_page
2332#define fscrypt_decrypt_page fscrypt_notsupp_decrypt_page
2333#define fscrypt_decrypt_bio_pages fscrypt_notsupp_decrypt_bio_pages
2334#define fscrypt_pullback_bio_page fscrypt_notsupp_pullback_bio_page
2335#define fscrypt_restore_control_page fscrypt_notsupp_restore_control_page
2336#define fscrypt_zeroout_range fscrypt_notsupp_zeroout_range
2337#define fscrypt_process_policy fscrypt_notsupp_process_policy
2338#define fscrypt_get_policy fscrypt_notsupp_get_policy
2339#define fscrypt_has_permitted_context fscrypt_notsupp_has_permitted_context
2340#define fscrypt_inherit_context fscrypt_notsupp_inherit_context
2341#define fscrypt_get_encryption_info fscrypt_notsupp_get_encryption_info
2342#define fscrypt_put_encryption_info fscrypt_notsupp_put_encryption_info
2343#define fscrypt_setup_filename fscrypt_notsupp_setup_filename
2344#define fscrypt_free_filename fscrypt_notsupp_free_filename
2345#define fscrypt_fname_encrypted_size fscrypt_notsupp_fname_encrypted_size
2346#define fscrypt_fname_alloc_buffer fscrypt_notsupp_fname_alloc_buffer
2347#define fscrypt_fname_free_buffer fscrypt_notsupp_fname_free_buffer
2348#define fscrypt_fname_disk_to_usr fscrypt_notsupp_fname_disk_to_usr
2349#define fscrypt_fname_usr_to_disk fscrypt_notsupp_fname_usr_to_disk
Michael Halcrowd5d0e8c2015-04-12 00:56:17 -04002350#endif
2351
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002352/* dir.c */
Theodore Ts'o60fd4da2010-07-27 11:54:40 -04002353extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
Theodore Ts'of7c21172011-01-10 12:10:55 -05002354 struct file *,
Theodore Ts'o60fd4da2010-07-27 11:54:40 -04002355 struct ext4_dir_entry_2 *,
Tao Ma226ba972012-12-10 14:05:58 -05002356 struct buffer_head *, char *, int,
2357 unsigned int);
2358#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
Theodore Ts'of7c21172011-01-10 12:10:55 -05002359 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
Tao Ma226ba972012-12-10 14:05:58 -05002360 (de), (bh), (buf), (size), (offset)))
Mingming Cao617ba132006-10-11 01:20:53 -07002361extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Theodore Ts'o2f618302015-04-12 00:56:26 -04002362 __u32 minor_hash,
2363 struct ext4_dir_entry_2 *dirent,
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002364 struct fscrypt_str *ent_name);
Mingming Cao617ba132006-10-11 01:20:53 -07002365extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Tao Ma978fef92012-12-10 14:05:58 -05002366extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2367 struct buffer_head *bh,
2368 void *buf, int buf_size,
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002369 struct ext4_filename *fname,
Tao Ma978fef92012-12-10 14:05:58 -05002370 struct ext4_dir_entry_2 **dest_de);
Michael Halcrow4bdfc872015-04-12 00:56:28 -04002371int ext4_insert_dentry(struct inode *dir,
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002372 struct inode *inode,
2373 struct ext4_dir_entry_2 *de,
2374 int buf_size,
2375 struct ext4_filename *fname);
Tao Ma978fef92012-12-10 14:05:58 -05002376static inline void ext4_update_dx_flag(struct inode *inode)
2377{
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002378 if (!ext4_has_feature_dir_index(inode->i_sb))
Tao Ma978fef92012-12-10 14:05:58 -05002379 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2380}
Tao Ma65d165d2012-12-10 14:05:59 -05002381static unsigned char ext4_filetype_table[] = {
2382 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2383};
2384
2385static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2386{
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002387 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
Tao Ma65d165d2012-12-10 14:05:59 -05002388 return DT_UNKNOWN;
2389
2390 return ext4_filetype_table[filetype];
2391}
Darrick J. Wong40b163f2014-07-28 13:06:26 -04002392extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2393 void *buf, int buf_size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002394
2395/* fsync.c */
Josef Bacik02c24a82011-07-16 20:44:56 -04002396extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002397
2398/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002399extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002400 dx_hash_info *hinfo);
2401
2402/* ialloc.c */
Theodore Ts'o11395752013-02-09 16:27:09 -05002403extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2404 const struct qstr *qstr, __u32 goal,
2405 uid_t *owner, int handle_type,
2406 unsigned int line_no, int nblocks);
2407
2408#define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2409 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2410 0, 0, 0)
2411#define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2412 type, nblocks) \
2413 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2414 (type), __LINE__, (nblocks))
2415
2416
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002417extern void ext4_free_inode(handle_t *, struct inode *);
2418extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2419extern unsigned long ext4_count_free_inodes(struct super_block *);
2420extern unsigned long ext4_count_dirs(struct super_block *);
2421extern void ext4_check_inodes_bitmap(struct super_block *);
Theodore Ts'o61d08672010-10-27 21:30:15 -04002422extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002423extern int ext4_init_inode_table(struct super_block *sb,
2424 ext4_group_t group, int barrier);
Theodore Ts'o813e5722012-02-20 17:52:46 -05002425extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002426
Alex Tomasc9de5602008-01-29 00:19:52 -05002427/* mballoc.c */
Theodore Ts'oebd173b2015-09-23 12:46:17 -04002428extern const struct file_operations ext4_seq_mb_groups_fops;
Alex Tomasc9de5602008-01-29 00:19:52 -05002429extern long ext4_mb_stats;
2430extern long ext4_mb_max_to_scan;
Akira Fujita9d990122012-05-28 14:19:25 -04002431extern int ext4_mb_init(struct super_block *);
Alex Tomasc9de5602008-01-29 00:19:52 -05002432extern int ext4_mb_release(struct super_block *);
2433extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2434 struct ext4_allocation_request *, int *);
2435extern int ext4_mb_reserve_blocks(struct super_block *, int);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04002436extern void ext4_discard_preallocations(struct inode *);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002437extern int __init ext4_init_mballoc(void);
2438extern void ext4_exit_mballoc(void);
Theodore Ts'o44338712009-11-22 07:44:56 -05002439extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'oe6362602009-11-23 07:17:05 -05002440 struct buffer_head *bh, ext4_fsblk_t block,
2441 unsigned long count, int flags);
Theodore Ts'o28623c22012-09-05 01:31:50 -04002442extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2443 ext4_group_t ngroups);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05002444extern int ext4_mb_add_groupinfo(struct super_block *sb,
Frederic Bohe5f21b0e2008-07-11 19:27:31 -04002445 ext4_group_t i, struct ext4_group_desc *desc);
Yongqiang Yangcc7365d2011-07-26 21:46:07 -04002446extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
Amir Goldstein2846e822011-05-09 10:46:41 -04002447 ext4_fsblk_t block, unsigned long count);
Lukas Czerner7360d172010-10-27 21:30:12 -04002448extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2449
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002450/* inode.c */
Theodore Ts'of348c252015-04-16 01:55:00 -04002451int ext4_inode_is_fast_symlink(struct inode *inode);
Theodore Ts'o10560082014-08-29 20:51:32 -04002452struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
Theodore Ts'o1c215022014-08-29 20:52:15 -04002453struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
Jan Kara705965b2016-03-08 23:08:10 -05002454int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2455 struct buffer_head *bh_result, int create);
Jan Kara12735f82016-05-13 00:51:15 -04002456int ext4_dax_get_block(struct inode *inode, sector_t iblock,
2457 struct buffer_head *bh_result, int create);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002458int ext4_get_block(struct inode *inode, sector_t iblock,
Jan Kara705965b2016-03-08 23:08:10 -05002459 struct buffer_head *bh_result, int create);
2460int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2461 struct buffer_head *bh_result, int create);
Tao Ma9c3569b2012-12-10 14:05:57 -05002462int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2463 struct buffer_head *bh, int create);
Tao Maf19d5872012-12-10 14:05:51 -05002464int ext4_walk_page_buffers(handle_t *handle,
2465 struct buffer_head *head,
2466 unsigned from,
2467 unsigned to,
2468 int *partial,
2469 int (*fn)(handle_t *handle,
2470 struct buffer_head *bh));
2471int do_journal_get_write_access(handle_t *handle,
2472 struct buffer_head *bh);
Tao Ma9c3569b2012-12-10 14:05:57 -05002473#define FALL_BACK_TO_NONDELALLOC 1
2474#define CONVERT_INLINE_DATA 2
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002475
David Howells1d1fe1e2008-02-07 00:15:37 -08002476extern struct inode *ext4_iget(struct super_block *, unsigned long);
Theodore Ts'of4bb2982014-10-05 22:56:00 -04002477extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
Christoph Hellwiga9185b42010-03-05 09:21:37 +01002478extern int ext4_write_inode(struct inode *, struct writeback_control *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002479extern int ext4_setattr(struct dentry *, struct iattr *);
Mingming Cao3e3398a2008-07-11 19:27:31 -04002480extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2481 struct kstat *stat);
Al Viro0930fcc2010-06-07 13:16:22 -04002482extern void ext4_evict_inode(struct inode *);
2483extern void ext4_clear_inode(struct inode *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002484extern int ext4_sync_inode(handle_t *, struct inode *);
Christoph Hellwigaa385722011-05-27 06:53:02 -04002485extern void ext4_dirty_inode(struct inode *, int);
Mingming Cao617ba132006-10-11 01:20:53 -07002486extern int ext4_change_inode_journal_flag(struct inode *, int);
2487extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
Jan Karaa3612932013-08-16 21:19:41 -04002488extern int ext4_inode_attach_jinode(struct inode *inode);
Duane Griffin91ef4ca2008-07-11 19:27:31 -04002489extern int ext4_can_truncate(struct inode *inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002490extern void ext4_truncate(struct inode *);
Ashish Sangwanaeb28172013-07-01 08:12:38 -04002491extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
Jan Kara487caee2009-08-17 22:17:20 -04002492extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
Mingming Cao617ba132006-10-11 01:20:53 -07002493extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -04002494extern void ext4_get_inode_flags(struct ext4_inode_info *);
Theodore Ts'occd25062009-02-26 01:04:07 -05002495extern int ext4_alloc_da_blocks(struct inode *inode);
Mingming Cao617ba132006-10-11 01:20:53 -07002496extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07002497extern int ext4_writepage_trans_blocks(struct inode *);
Mingming Caof3bd1f32008-08-19 22:16:03 -04002498extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
Lukas Czernera87dd182013-05-27 23:32:35 -04002499extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2500 loff_t lstart, loff_t lend);
Nick Pigginc2ec1752009-03-31 15:23:21 -07002501extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
Jan Karaea3d7202015-12-07 14:28:03 -05002502extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
Dmitry Monakhova9e7f442009-12-14 15:21:14 +03002503extern qsize_t *ext4_get_reserved_space(struct inode *inode);
Li Xi040cb372016-01-08 16:01:21 -05002504extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05002505extern void ext4_da_update_reserve_space(struct inode *inode,
2506 int used, int quota_claim);
Jan Kara53085fa2015-12-07 15:09:35 -05002507extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2508 ext4_fsblk_t pblk, ext4_lblk_t len);
Jan Kara2d90c162016-03-09 23:11:13 -05002509extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk,
2510 unsigned int map_len,
2511 struct extent_status *result);
Amir Goldsteindae1e522011-06-27 19:40:50 -04002512
2513/* indirect.c */
2514extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2515 struct ext4_map_blocks *map, int flags);
Amir Goldsteindae1e522011-06-27 19:40:50 -04002516extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
Jan Karafa55a0e2013-06-04 12:56:55 -04002517extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
Theodore Ts'o819c4922013-04-03 12:47:17 -04002518extern void ext4_ind_truncate(handle_t *, struct inode *inode);
Lukas Czerner4f579ae2014-07-15 06:03:38 -04002519extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2520 ext4_lblk_t start, ext4_lblk_t end);
Amir Goldsteinff9893d2011-06-27 16:36:31 -04002521
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002522/* ioctl.c */
Andi Kleen5cdd7b22008-04-29 22:03:54 -04002523extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002524extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002525
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05002526/* migrate.c */
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -04002527extern int ext4_ext_migrate(struct inode *);
Lukas Czerner0d14b092013-04-10 23:32:52 -04002528extern int ext4_ind_migrate(struct inode *inode);
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002529
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002530/* namei.c */
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002531extern int ext4_dirent_csum_verify(struct inode *inode,
2532 struct ext4_dir_entry *dirent);
Mingming Cao617ba132006-10-11 01:20:53 -07002533extern int ext4_orphan_add(handle_t *, struct inode *);
2534extern int ext4_orphan_del(handle_t *, struct inode *);
2535extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002536 __u32 start_minor_hash, __u32 *next_hash);
Theodore Ts'o5b643f92015-05-18 13:14:47 -04002537extern int ext4_search_dir(struct buffer_head *bh,
2538 char *search_buf,
2539 int buf_size,
2540 struct inode *dir,
2541 struct ext4_filename *fname,
2542 const struct qstr *d_name,
2543 unsigned int offset,
2544 struct ext4_dir_entry_2 **res_dir);
Tao Ma05019a92012-12-10 14:06:00 -05002545extern int ext4_generic_delete_entry(handle_t *handle,
2546 struct inode *dir,
2547 struct ext4_dir_entry_2 *de_del,
2548 struct buffer_head *bh,
2549 void *entry_buf,
2550 int buf_size,
2551 int csum_size);
Jaegeuk Kima7550b32016-07-10 14:01:03 -04002552extern bool ext4_empty_dir(struct inode *inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002553
2554/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002555extern int ext4_group_add(struct super_block *sb,
2556 struct ext4_new_group_data *input);
2557extern int ext4_group_extend(struct super_block *sb,
2558 struct ext4_super_block *es,
2559 ext4_fsblk_t n_blocks_count);
Yongqiang Yang19c52462012-01-04 17:09:44 -05002560extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002561
2562/* super.c */
Theodore Ts'oebd173b2015-09-23 12:46:17 -04002563extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
Theodore Ts'o952fc182012-07-09 16:27:05 -04002564extern int ext4_calculate_overhead(struct super_block *sb);
Theodore Ts'o06db49e2012-10-10 01:06:58 -04002565extern void ext4_superblock_csum_set(struct super_block *sb);
Theodore Ts'o9933fc02011-08-01 08:45:02 -04002566extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2567extern void *ext4_kvzalloc(size_t size, gfp_t flags);
Theodore Ts'o117fff12012-09-05 01:29:50 -04002568extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2569 ext4_group_t ngroup);
Theodore Ts'o722887d2013-02-08 13:00:31 -05002570extern const char *ext4_decode_error(struct super_block *sb, int errno,
2571 char nbuf[16]);
Joe Perchese7c96e82013-07-01 08:12:37 -04002572
Joe Perchesb9075fa2011-10-31 17:11:33 -07002573extern __printf(4, 5)
2574void __ext4_error(struct super_block *, const char *, unsigned int,
2575 const char *, ...);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002576extern __printf(5, 6)
Joe Perchese7c96e82013-07-01 08:12:37 -04002577void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
Joe Perchesb9075fa2011-10-31 17:11:33 -07002578 const char *, ...);
2579extern __printf(5, 6)
Joe Perchese7c96e82013-07-01 08:12:37 -04002580void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
Joe Perchesb9075fa2011-10-31 17:11:33 -07002581 const char *, ...);
Theodore Ts'oc398eda2010-07-27 11:56:40 -04002582extern void __ext4_std_error(struct super_block *, const char *,
2583 unsigned int, int);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002584extern __printf(4, 5)
2585void __ext4_abort(struct super_block *, const char *, unsigned int,
2586 const char *, ...);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002587extern __printf(4, 5)
2588void __ext4_warning(struct super_block *, const char *, unsigned int,
2589 const char *, ...);
Andreas Dilgerb03a2f72015-06-15 14:50:26 -04002590extern __printf(4, 5)
2591void __ext4_warning_inode(const struct inode *inode, const char *function,
2592 unsigned int line, const char *fmt, ...);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002593extern __printf(3, 4)
Joe Perchese7c96e82013-07-01 08:12:37 -04002594void __ext4_msg(struct super_block *, const char *, const char *, ...);
Johann Lombardic5e06d12011-05-24 18:31:25 -04002595extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2596 const char *, unsigned int, const char *);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002597extern __printf(7, 8)
2598void __ext4_grp_locked_error(const char *, unsigned int,
2599 struct super_block *, ext4_group_t,
2600 unsigned long, ext4_fsblk_t,
2601 const char *, ...);
Joe Perchese7c96e82013-07-01 08:12:37 -04002602
Andreas Dilgerb03a2f72015-06-15 14:50:26 -04002603#define EXT4_ERROR_INODE(inode, fmt, a...) \
2604 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2605
2606#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
2607 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2608
2609#define EXT4_ERROR_FILE(file, block, fmt, a...) \
2610 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2611
Joe Perchese7c96e82013-07-01 08:12:37 -04002612#ifdef CONFIG_PRINTK
2613
2614#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2615 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2616#define ext4_error_file(file, func, line, block, fmt, ...) \
2617 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2618#define ext4_error(sb, fmt, ...) \
2619 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2620#define ext4_abort(sb, fmt, ...) \
2621 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2622#define ext4_warning(sb, fmt, ...) \
2623 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
Andreas Dilgerb03a2f72015-06-15 14:50:26 -04002624#define ext4_warning_inode(inode, fmt, ...) \
2625 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
Joe Perchese7c96e82013-07-01 08:12:37 -04002626#define ext4_msg(sb, level, fmt, ...) \
2627 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2628#define dump_mmp_msg(sb, mmp, msg) \
2629 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2630#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2631 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2632 fmt, ##__VA_ARGS__)
2633
2634#else
2635
2636#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2637do { \
2638 no_printk(fmt, ##__VA_ARGS__); \
2639 __ext4_error_inode(inode, "", 0, block, " "); \
2640} while (0)
2641#define ext4_error_file(file, func, line, block, fmt, ...) \
2642do { \
2643 no_printk(fmt, ##__VA_ARGS__); \
2644 __ext4_error_file(file, "", 0, block, " "); \
2645} while (0)
2646#define ext4_error(sb, fmt, ...) \
2647do { \
2648 no_printk(fmt, ##__VA_ARGS__); \
2649 __ext4_error(sb, "", 0, " "); \
2650} while (0)
2651#define ext4_abort(sb, fmt, ...) \
2652do { \
2653 no_printk(fmt, ##__VA_ARGS__); \
2654 __ext4_abort(sb, "", 0, " "); \
2655} while (0)
2656#define ext4_warning(sb, fmt, ...) \
2657do { \
2658 no_printk(fmt, ##__VA_ARGS__); \
2659 __ext4_warning(sb, "", 0, " "); \
2660} while (0)
Andreas Dilgerb03a2f72015-06-15 14:50:26 -04002661#define ext4_warning_inode(inode, fmt, ...) \
2662do { \
2663 no_printk(fmt, ##__VA_ARGS__); \
2664 __ext4_warning_inode(inode, "", 0, " "); \
2665} while (0)
Joe Perchese7c96e82013-07-01 08:12:37 -04002666#define ext4_msg(sb, level, fmt, ...) \
2667do { \
2668 no_printk(fmt, ##__VA_ARGS__); \
2669 __ext4_msg(sb, "", " "); \
2670} while (0)
2671#define dump_mmp_msg(sb, mmp, msg) \
2672 __dump_mmp_msg(sb, mmp, "", 0, "")
2673#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2674do { \
2675 no_printk(fmt, ##__VA_ARGS__); \
2676 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2677} while (0)
2678
2679#endif
2680
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002681extern void ext4_update_dynamic_rev(struct super_block *sb);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -05002682extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2683 __u32 compat);
2684extern int ext4_update_rocompat_feature(handle_t *handle,
2685 struct super_block *sb, __u32 rocompat);
2686extern int ext4_update_incompat_feature(handle_t *handle,
2687 struct super_block *sb, __u32 incompat);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002688extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2689 struct ext4_group_desc *bg);
2690extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2691 struct ext4_group_desc *bg);
2692extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2693 struct ext4_group_desc *bg);
Theodore Ts'o021b65b2011-09-09 19:08:51 -04002694extern __u32 ext4_free_group_clusters(struct super_block *sb,
2695 struct ext4_group_desc *bg);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05002696extern __u32 ext4_free_inodes_count(struct super_block *sb,
2697 struct ext4_group_desc *bg);
2698extern __u32 ext4_used_dirs_count(struct super_block *sb,
2699 struct ext4_group_desc *bg);
2700extern __u32 ext4_itable_unused_count(struct super_block *sb,
2701 struct ext4_group_desc *bg);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002702extern void ext4_block_bitmap_set(struct super_block *sb,
2703 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2704extern void ext4_inode_bitmap_set(struct super_block *sb,
2705 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2706extern void ext4_inode_table_set(struct super_block *sb,
2707 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Theodore Ts'o021b65b2011-09-09 19:08:51 -04002708extern void ext4_free_group_clusters_set(struct super_block *sb,
2709 struct ext4_group_desc *bg,
2710 __u32 count);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05002711extern void ext4_free_inodes_set(struct super_block *sb,
2712 struct ext4_group_desc *bg, __u32 count);
2713extern void ext4_used_dirs_set(struct super_block *sb,
2714 struct ext4_group_desc *bg, __u32 count);
2715extern void ext4_itable_unused_set(struct super_block *sb,
2716 struct ext4_group_desc *bg, __u32 count);
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002717extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
Theodore Ts'obb23c202009-05-01 19:44:44 -04002718 struct ext4_group_desc *gdp);
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002719extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2720 struct ext4_group_desc *gdp);
Theodore Ts'o7f511862013-01-13 08:41:45 -05002721extern int ext4_register_li_request(struct super_block *sb,
2722 ext4_group_t first_not_zeroed);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002723
Darrick J. Wong41a246d2012-04-29 18:33:10 -04002724static inline int ext4_has_group_desc_csum(struct super_block *sb)
2725{
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002726 return ext4_has_feature_gdt_csum(sb) ||
2727 EXT4_SB(sb)->s_chksum_driver != NULL;
Darrick J. Wong41a246d2012-04-29 18:33:10 -04002728}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002729
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -04002730static inline int ext4_has_metadata_csum(struct super_block *sb)
2731{
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002732 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -04002733 !EXT4_SB(sb)->s_chksum_driver);
2734
2735 return (EXT4_SB(sb)->s_chksum_driver != NULL);
2736}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002737static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2738{
2739 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04002740 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002741}
2742
2743static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2744{
2745 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002746 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002747}
2748
2749static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2750{
2751 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002752 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002753}
2754
2755static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2756 ext4_fsblk_t blk)
2757{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04002758 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002759 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2760}
2761
2762static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2763 ext4_fsblk_t blk)
2764{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002765 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002766 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2767}
2768
2769static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2770 ext4_fsblk_t blk)
2771{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002772 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002773 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2774}
2775
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002776static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2777{
Theodore Ts'o06a279d2009-01-17 18:41:37 -05002778 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2779 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2780 le32_to_cpu(raw_inode->i_size_lo);
2781 else
2782 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002783}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002784
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002785static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2786{
2787 raw_inode->i_size_lo = cpu_to_le32(i_size);
2788 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2789}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002790
Alex Tomasc9de5602008-01-29 00:19:52 -05002791static inline
2792struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002793 ext4_group_t group)
Alex Tomasc9de5602008-01-29 00:19:52 -05002794{
2795 struct ext4_group_info ***grp_info;
2796 long indexv, indexh;
Theodore Ts'o2f2e09e2013-06-06 11:16:43 -04002797 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
Alex Tomasc9de5602008-01-29 00:19:52 -05002798 grp_info = EXT4_SB(sb)->s_group_info;
2799 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2800 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2801 return grp_info[indexv][indexh];
2802}
2803
Theodore Ts'o8df96752009-05-01 08:50:38 -04002804/*
2805 * Reading s_groups_count requires using smp_rmb() afterwards. See
2806 * the locking protocol documented in the comments of ext4_group_add()
2807 * in resize.c
2808 */
2809static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2810{
2811 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2812
2813 smp_rmb();
2814 return ngroups;
2815}
Alex Tomasc9de5602008-01-29 00:19:52 -05002816
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002817static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2818 ext4_group_t block_group)
2819{
2820 return block_group >> sbi->s_log_groups_per_flex;
2821}
2822
2823static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2824{
2825 return 1 << sbi->s_log_groups_per_flex;
2826}
2827
Mingming Cao617ba132006-10-11 01:20:53 -07002828#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002829do { \
2830 if ((errno)) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -04002831 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002832} while (0)
2833
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002834#ifdef CONFIG_SMP
Theodore Ts'odf55c992011-09-09 19:16:51 -04002835/* Each CPU can accumulate percpu_counter_batch clusters in their local
2836 * counters. So we need to make sure we have free clusters more
Eric Dumazet179f7eb2009-01-06 14:41:04 -08002837 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002838 */
Theodore Ts'odf55c992011-09-09 19:16:51 -04002839#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002840#else
Theodore Ts'odf55c992011-09-09 19:16:51 -04002841#define EXT4_FREECLUSTERS_WATERMARK 0
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002842#endif
2843
Jan Kara90e775b2013-08-17 10:09:31 -04002844/* Update i_disksize. Requires i_mutex to avoid races with truncate */
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04002845static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2846{
Jan Kara90e775b2013-08-17 10:09:31 -04002847 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
Al Viro59551022016-01-22 15:40:57 -05002848 !inode_is_locked(inode));
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04002849 down_write(&EXT4_I(inode)->i_data_sem);
2850 if (newsize > EXT4_I(inode)->i_disksize)
2851 EXT4_I(inode)->i_disksize = newsize;
2852 up_write(&EXT4_I(inode)->i_data_sem);
Jan Kara90e775b2013-08-17 10:09:31 -04002853}
2854
Dmitry Monakhov4631dbf2014-08-23 17:48:28 -04002855/* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2856static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2857{
2858 int changed = 0;
2859
2860 if (newsize > inode->i_size) {
2861 i_size_write(inode, newsize);
2862 changed = 1;
2863 }
2864 if (newsize > EXT4_I(inode)->i_disksize) {
2865 ext4_update_i_disksize(inode, newsize);
2866 changed |= 2;
2867 }
2868 return changed;
2869}
2870
Jan Kara01127842015-12-07 14:34:49 -05002871int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2872 loff_t len);
2873
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002874struct ext4_group_info {
2875 unsigned long bb_state;
2876 struct rb_root bb_free_root;
Eric Sandeena36b4492009-08-25 22:36:45 -04002877 ext4_grpblk_t bb_first_free; /* first free block */
2878 ext4_grpblk_t bb_free; /* total free blocks */
2879 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
Curt Wohlgemuth8a57d9d2010-05-16 15:00:00 -04002880 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002881 struct list_head bb_prealloc_list;
2882#ifdef DOUBLE_CHECK
2883 void *bb_bitmap;
2884#endif
2885 struct rw_semaphore alloc_sem;
Eric Sandeena36b4492009-08-25 22:36:45 -04002886 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2887 * regions, index is order.
2888 * bb_counters[3] = 5 means
2889 * 5 free 8-block regions. */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002890};
2891
Tao Ma3d56b8d2011-07-11 00:03:38 -04002892#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2893#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
Darrick J. Wong163a2032013-08-28 17:35:51 -04002894#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
Darrick J. Wong87a39382013-08-28 18:32:58 -04002895#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002896
2897#define EXT4_MB_GRP_NEED_INIT(grp) \
2898 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
Darrick J. Wong163a2032013-08-28 17:35:51 -04002899#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2900 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
Darrick J. Wong87a39382013-08-28 18:32:58 -04002901#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2902 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002903
Tao Ma3d56b8d2011-07-11 00:03:38 -04002904#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2905 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2906#define EXT4_MB_GRP_SET_TRIMMED(grp) \
2907 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2908#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2909 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2910
Theodore Ts'o50797482009-09-18 13:34:02 -04002911#define EXT4_MAX_CONTENTION 8
2912#define EXT4_CONTENTION_THRESHOLD 2
2913
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002914static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2915 ext4_group_t group)
2916{
2917 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2918}
2919
Theodore Ts'o50797482009-09-18 13:34:02 -04002920/*
2921 * Returns true if the filesystem is busy enough that attempts to
2922 * access the block group locks has run into contention.
2923 */
2924static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2925{
2926 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2927}
2928
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002929static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2930{
Theodore Ts'o50797482009-09-18 13:34:02 -04002931 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2932 if (spin_trylock(lock))
2933 /*
2934 * We're able to grab the lock right away, so drop the
2935 * lock contention counter.
2936 */
2937 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2938 else {
2939 /*
2940 * The lock is busy, so bump the contention counter,
2941 * and then wait on the spin lock.
2942 */
2943 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2944 EXT4_MAX_CONTENTION);
2945 spin_lock(lock);
2946 }
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002947}
2948
2949static inline void ext4_unlock_group(struct super_block *sb,
2950 ext4_group_t group)
2951{
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002952 spin_unlock(ext4_group_lock_ptr(sb, group));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002953}
2954
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002955/*
Theodore Ts'o1f7d1e72011-06-27 19:16:02 -04002956 * Block validity checking
2957 */
2958#define ext4_check_indirect_blockref(inode, bh) \
2959 ext4_check_blockref(__func__, __LINE__, inode, \
2960 (__le32 *)(bh)->b_data, \
2961 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2962
2963#define ext4_ind_check_inode(inode) \
2964 ext4_check_blockref(__func__, __LINE__, inode, \
2965 EXT4_I(inode)->i_data, \
2966 EXT4_NDIR_BLOCKS)
2967
2968/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002969 * Inodes and files operations
2970 */
2971
2972/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002973extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002974
2975/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002976extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07002977extern const struct file_operations ext4_file_operations;
Toshiyuki Okajimae0d10bf2010-10-27 21:30:06 -04002978extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002979
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05002980/* inline.c */
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05002981extern int ext4_get_max_inline_size(struct inode *inode);
2982extern int ext4_find_inline_data_nolock(struct inode *inode);
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05002983extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2984 unsigned int len);
2985extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2986
2987extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2988extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2989 struct inode *inode,
2990 loff_t pos, unsigned len,
2991 unsigned flags,
2992 struct page **pagep);
2993extern int ext4_write_inline_data_end(struct inode *inode,
2994 loff_t pos, unsigned len,
2995 unsigned copied,
2996 struct page *page);
2997extern struct buffer_head *
2998ext4_journalled_write_inline_data(struct inode *inode,
2999 unsigned len,
3000 struct page *page);
3001extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3002 struct inode *inode,
3003 loff_t pos, unsigned len,
3004 unsigned flags,
3005 struct page **pagep,
3006 void **fsdata);
3007extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3008 unsigned len, unsigned copied,
3009 struct page *page);
Theodore Ts'o5b643f92015-05-18 13:14:47 -04003010extern int ext4_try_add_inline_entry(handle_t *handle,
3011 struct ext4_filename *fname,
Theodore Ts'o56a04912016-01-08 16:00:31 -05003012 struct inode *dir, struct inode *inode);
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05003013extern int ext4_try_create_inline_dir(handle_t *handle,
3014 struct inode *parent,
3015 struct inode *inode);
3016extern int ext4_read_inline_dir(struct file *filp,
Al Viro725bebb2013-05-17 16:08:53 -04003017 struct dir_context *ctx,
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05003018 int *has_inline_data);
Tao Ma8af0f082013-04-19 17:53:09 -04003019extern int htree_inlinedir_to_tree(struct file *dir_file,
3020 struct inode *dir, ext4_lblk_t block,
3021 struct dx_hash_info *hinfo,
3022 __u32 start_hash, __u32 start_minor_hash,
3023 int *has_inline_data);
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05003024extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
Theodore Ts'o5b643f92015-05-18 13:14:47 -04003025 struct ext4_filename *fname,
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05003026 const struct qstr *d_name,
3027 struct ext4_dir_entry_2 **res_dir,
3028 int *has_inline_data);
3029extern int ext4_delete_inline_entry(handle_t *handle,
3030 struct inode *dir,
3031 struct ext4_dir_entry_2 *de_del,
3032 struct buffer_head *bh,
3033 int *has_inline_data);
Jaegeuk Kima7550b32016-07-10 14:01:03 -04003034extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05003035extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3036 struct ext4_dir_entry_2 **parent_de,
3037 int *retval);
3038extern int ext4_inline_data_fiemap(struct inode *inode,
3039 struct fiemap_extent_info *fieinfo,
Dmitry Monakhovd952d692014-12-02 16:11:20 -05003040 int *has_inline, __u64 start, __u64 len);
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05003041extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3042
3043extern int ext4_convert_inline_data(struct inode *inode);
3044
Zheng Liu83447cc2014-07-15 10:10:04 -04003045static inline int ext4_has_inline_data(struct inode *inode)
3046{
3047 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3048 EXT4_I(inode)->i_inline_off;
3049}
3050
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003051/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08003052extern const struct inode_operations ext4_dir_inode_operations;
3053extern const struct inode_operations ext4_special_inode_operations;
Theodore Ts'o596397b2009-05-01 13:49:15 -04003054extern struct dentry *ext4_get_parent(struct dentry *child);
Tao Maa774f9c2012-12-10 14:05:57 -05003055extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3056 struct ext4_dir_entry_2 *de,
3057 int blocksize, int csum_size,
3058 unsigned int parent_ino, int dotdot_real_len);
Tao Ma3c47d542012-12-10 14:05:59 -05003059extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3060 unsigned int blocksize);
3061extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3062 struct inode *inode,
3063 struct buffer_head *bh);
Tao Ma8af0f082013-04-19 17:53:09 -04003064#define S_SHIFT 12
3065static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
3066 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3067 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3068 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3069 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3070 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3071 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3072 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3073};
3074
3075static inline void ext4_set_de_type(struct super_block *sb,
3076 struct ext4_dir_entry_2 *de,
3077 umode_t mode) {
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003078 if (ext4_has_feature_filetype(sb))
Tao Ma8af0f082013-04-19 17:53:09 -04003079 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3080}
3081
Theodore Ts'of64e02f2015-04-08 00:00:32 -04003082/* readpages.c */
3083extern int ext4_mpage_readpages(struct address_space *mapping,
3084 struct list_head *pages, struct page *page,
3085 unsigned nr_pages);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003086
3087/* symlink.c */
Al Viroa7a67e82015-04-27 17:51:30 -04003088extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08003089extern const struct inode_operations ext4_symlink_inode_operations;
3090extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003091
Theodore Ts'ob5799012015-09-23 12:44:17 -04003092/* sysfs.c */
3093extern int ext4_register_sysfs(struct super_block *sb);
Theodore Ts'oebd173b2015-09-23 12:46:17 -04003094extern void ext4_unregister_sysfs(struct super_block *sb);
Theodore Ts'ob5799012015-09-23 12:44:17 -04003095extern int __init ext4_init_sysfs(void);
3096extern void ext4_exit_sysfs(void);
3097
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04003098/* block_validity */
3099extern void ext4_release_system_zone(struct super_block *sb);
3100extern int ext4_setup_system_zone(struct super_block *sb);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04003101extern int __init ext4_init_system_zone(void);
3102extern void ext4_exit_system_zone(void);
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04003103extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3104 ext4_fsblk_t start_blk,
3105 unsigned int count);
Theodore Ts'o1f7d1e72011-06-27 19:16:02 -04003106extern int ext4_check_blockref(const char *, unsigned int,
3107 struct inode *, __le32 *, unsigned int);
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04003108
Alex Tomasa86c6182006-10-11 01:21:03 -07003109/* extents.c */
Theodore Ts'o4a092d72012-11-28 13:03:30 -05003110struct ext4_ext_path;
3111struct ext4_extent;
3112
Zheng Liud7b2a002013-08-28 14:47:06 -04003113/*
3114 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3115 * __le32.
3116 */
3117#define EXT_MAX_BLOCKS 0xffffffff
3118
Alex Tomasa86c6182006-10-11 01:21:03 -07003119extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3120extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
Jan Karafffb2732013-06-04 13:01:11 -04003121extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003122extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3123 struct ext4_map_blocks *map, int flags);
Theodore Ts'o819c4922013-04-03 12:47:17 -04003124extern void ext4_ext_truncate(handle_t *, struct inode *);
Theodore Ts'o26a4c0c2013-04-03 12:45:17 -04003125extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3126 ext4_lblk_t end);
Alex Tomasa86c6182006-10-11 01:21:03 -07003127extern void ext4_ext_init(struct super_block *);
3128extern void ext4_ext_release(struct super_block *);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01003129extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
Amit Aroraa2df2a62007-07-17 21:42:41 -04003130 loff_t len);
Jan Kara6b523df2013-06-04 13:21:11 -04003131extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3132 loff_t offset, ssize_t len);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003133extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3134 struct ext4_map_blocks *map, int flags);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05003135extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3136 ext4_lblk_t lblocks);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05003137extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3138 int num,
3139 struct ext4_ext_path *path);
3140extern int ext4_can_extents_be_merged(struct inode *inode,
3141 struct ext4_extent *ex1,
3142 struct ext4_extent *ex2);
3143extern int ext4_ext_insert_extent(handle_t *, struct inode *,
Theodore Ts'odfe50802014-09-01 14:37:09 -04003144 struct ext4_ext_path **,
Theodore Ts'o4a092d72012-11-28 13:03:30 -05003145 struct ext4_extent *, int);
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04003146extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3147 struct ext4_ext_path **,
3148 int flags);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05003149extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3150extern int ext4_ext_check_inode(struct inode *inode);
Zheng Liuf7fec032013-02-18 00:28:47 -05003151extern int ext4_find_delalloc_range(struct inode *inode,
3152 ext4_lblk_t lblk_start,
3153 ext4_lblk_t lblk_end);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05003154extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04003155extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05003156extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3157 __u64 start, __u64 len);
Theodore Ts'o7869a4a2013-08-16 22:05:14 -04003158extern int ext4_ext_precache(struct inode *inode);
Namjae Jeon9eb79482014-02-23 15:18:59 -05003159extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
Namjae Jeon331573f2015-06-09 01:55:03 -04003160extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04003161extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3162 struct inode *inode2, ext4_lblk_t lblk1,
3163 ext4_lblk_t lblk2, ext4_lblk_t count,
3164 int mark_unwritten,int *err);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05003165
Akira Fujita748de672009-06-17 19:24:03 -04003166/* move_extent.c */
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -04003167extern void ext4_double_down_write_data_sem(struct inode *first,
3168 struct inode *second);
3169extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3170 struct inode *donor_inode);
Akira Fujita748de672009-06-17 19:24:03 -04003171extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3172 __u64 start_orig, __u64 start_donor,
3173 __u64 len, __u64 *moved_len);
3174
Theodore Ts'obd2d0212010-10-27 21:30:10 -04003175/* page-io.c */
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04003176extern int __init ext4_init_pageio(void);
3177extern void ext4_exit_pageio(void);
Theodore Ts'obd2d0212010-10-27 21:30:10 -04003178extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
Jan Kara97a851e2013-06-04 11:58:58 -04003179extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3180extern int ext4_put_io_end(ext4_io_end_t *io_end);
3181extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3182extern void ext4_io_submit_init(struct ext4_io_submit *io,
3183 struct writeback_control *wbc);
Jan Kara2e8fa542013-06-04 14:21:02 -04003184extern void ext4_end_io_rsv_work(struct work_struct *work);
Theodore Ts'obd2d0212010-10-27 21:30:10 -04003185extern void ext4_io_submit(struct ext4_io_submit *io);
3186extern int ext4_bio_write_page(struct ext4_io_submit *io,
3187 struct page *page,
3188 int len,
Namjae Jeon1c8349a2014-05-12 08:12:25 -04003189 struct writeback_control *wbc,
3190 bool keep_towrite);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05003191
Johann Lombardic5e06d12011-05-24 18:31:25 -04003192/* mmp.c */
3193extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3194
Jan Kara3613d222013-06-04 13:19:34 -04003195/*
Adam Buchbinder48fc7f72012-09-19 21:48:00 -04003196 * Add new method to test whether block and inode bitmaps are properly
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05003197 * initialized. With uninit_bg reading the block from disk is not enough
3198 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3199 */
3200#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3201
3202static inline int bitmap_uptodate(struct buffer_head *bh)
3203{
3204 return (buffer_uptodate(bh) &&
3205 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3206}
3207static inline void set_bitmap_uptodate(struct buffer_head *bh)
3208{
3209 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3210}
3211
Dmitry Monakhov17335dc2012-09-29 00:41:21 -04003212/*
3213 * Disable DIO read nolock optimization, so new dioreaders will be forced
3214 * to grab i_mutex
3215 */
3216static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3217{
3218 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3219 smp_mb();
3220}
3221static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3222{
3223 smp_mb();
3224 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3225}
3226
Akinobu Mita731eb1a2010-03-03 23:55:01 -05003227#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3228
Eric Sandeene9e3bce2011-02-12 08:17:34 -05003229/* For ioend & aio unwritten conversion wait queues */
3230#define EXT4_WQ_HASH_SZ 37
3231#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3232 EXT4_WQ_HASH_SZ])
Eric Sandeene9e3bce2011-02-12 08:17:34 -05003233extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
Eric Sandeene9e3bce2011-02-12 08:17:34 -05003234
Yongqiang Yang8f82f842011-07-26 21:35:44 -04003235#define EXT4_RESIZING 0
3236extern int ext4_resize_begin(struct super_block *sb);
3237extern void ext4_resize_end(struct super_block *sb);
3238
Jan Kara74c66bc2016-02-29 08:36:38 +11003239static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3240 struct ext4_io_end *io_end)
3241{
3242 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3243 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3244 atomic_inc(&EXT4_I(inode)->i_unwritten);
3245 }
3246}
3247
3248static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3249{
3250 struct inode *inode = io_end->inode;
3251
3252 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3253 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3254 /* Wake up anyone waiting on unwritten extent conversion */
3255 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3256 wake_up_all(ext4_ioend_wq(inode));
3257 }
3258}
3259
Jan Kara12735f82016-05-13 00:51:15 -04003260static inline bool ext4_aligned_io(struct inode *inode, loff_t off, loff_t len)
3261{
3262 int blksize = 1 << inode->i_blkbits;
3263
3264 return IS_ALIGNED(off, blksize) && IS_ALIGNED(len, blksize);
3265}
3266
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003267#endif /* __KERNEL__ */
3268
Darrick J. Wong6a797d22015-10-17 16:16:04 -04003269#define EFSBADCRC EBADMSG /* Bad CRC detected */
3270#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3271
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04003272#endif /* _EXT4_H */