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Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002 * ext4.h
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040016#ifndef _EXT4_H
17#define _EXT4_H
Dave Kleikampac27a0e2006-10-11 01:20:50 -070018
19#include <linux/types.h>
Mingming Cao3a5b2ec2006-10-11 01:21:05 -070020#include <linux/blkdev.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070021#include <linux/magic.h>
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -050022#include <linux/jbd2.h>
Mingming Cao60e58e02009-01-22 18:13:05 +010023#include <linux/quota.h>
Theodore Ts'od444c3c2009-05-01 13:44:33 -040024#include <linux/rwsem.h>
25#include <linux/rbtree.h>
26#include <linux/seqlock.h>
27#include <linux/mutex.h>
Theodore Ts'oca0faba2009-05-03 16:33:44 -040028#include <linux/timer.h>
29#include <linux/wait.h>
30#include <linux/blockgroup_lock.h>
31#include <linux/percpu_counter.h>
Theodore Ts'oefbed4d2013-10-17 21:11:01 -040032#include <linux/ratelimit.h>
Darrick J. Wong04419842012-04-29 18:27:10 -040033#include <crypto/hash.h>
Lukas Czernera633f5a2014-02-22 06:18:17 -050034#include <linux/falloc.h>
Ben Hutchings4d92dc02010-05-17 06:00:00 -040035#ifdef __KERNEL__
36#include <linux/compat.h>
37#endif
Alex Tomasc9de5602008-01-29 00:19:52 -050038
Dave Kleikampac27a0e2006-10-11 01:20:50 -070039/*
Shen Feng8a356942008-07-11 19:27:31 -040040 * The fourth extended filesystem constants/structures
Dave Kleikampac27a0e2006-10-11 01:20:50 -070041 */
42
43/*
Mingming Cao617ba132006-10-11 01:20:53 -070044 * Define EXT4FS_DEBUG to produce debug messages
Dave Kleikampac27a0e2006-10-11 01:20:50 -070045 */
Mingming Cao617ba132006-10-11 01:20:53 -070046#undef EXT4FS_DEBUG
Dave Kleikampac27a0e2006-10-11 01:20:50 -070047
48/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -070049 * Debug code
50 */
Mingming Cao617ba132006-10-11 01:20:53 -070051#ifdef EXT4FS_DEBUG
52#define ext4_debug(f, a...) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070053 do { \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040054 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -040055 __FILE__, __LINE__, __func__); \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040056 printk(KERN_DEBUG f, ## a); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070057 } while (0)
58#else
Joe Perchesace36ad2012-03-19 23:11:43 -040059#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070060#endif
61
Theodore Ts'o4a092d72012-11-28 13:03:30 -050062/*
63 * Turn on EXT_DEBUG to get lots of info about extents operations.
64 */
65#define EXT_DEBUG__
66#ifdef EXT_DEBUG
67#define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
68#else
69#define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
70#endif
71
Frank Mayhar273df552010-03-02 11:46:09 -050072#define EXT4_ERROR_INODE(inode, fmt, a...) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -040073 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
74
75#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
76 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
Frank Mayhar273df552010-03-02 11:46:09 -050077
Theodore Ts'of7c21172011-01-10 12:10:55 -050078#define EXT4_ERROR_FILE(file, block, fmt, a...) \
79 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
Frank Mayhar273df552010-03-02 11:46:09 -050080
Theodore Ts'od444c3c2009-05-01 13:44:33 -040081/* data type for block offset of block group */
82typedef int ext4_grpblk_t;
83
84/* data type for filesystem-wide blocks number */
85typedef unsigned long long ext4_fsblk_t;
86
87/* data type for file logical block number */
88typedef __u32 ext4_lblk_t;
89
90/* data type for block group number */
91typedef unsigned int ext4_group_t;
92
Theodore Ts'o296c3552009-09-30 00:32:42 -040093/*
Theodore Ts'o60e66792010-05-17 07:00:00 -040094 * Flags used in mballoc's allocation_context flags field.
Theodore Ts'o296c3552009-09-30 00:32:42 -040095 *
96 * Also used to show what's going on for debugging purposes when the
97 * flag field is exported via the traceport interface
98 */
Theodore Ts'od444c3c2009-05-01 13:44:33 -040099
Alex Tomasc9de5602008-01-29 00:19:52 -0500100/* prefer goal again. length */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400101#define EXT4_MB_HINT_MERGE 0x0001
Alex Tomasc9de5602008-01-29 00:19:52 -0500102/* blocks already reserved */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400103#define EXT4_MB_HINT_RESERVED 0x0002
Alex Tomasc9de5602008-01-29 00:19:52 -0500104/* metadata is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400105#define EXT4_MB_HINT_METADATA 0x0004
Alex Tomasc9de5602008-01-29 00:19:52 -0500106/* first blocks in the file */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400107#define EXT4_MB_HINT_FIRST 0x0008
Alex Tomasc9de5602008-01-29 00:19:52 -0500108/* search for the best chunk */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400109#define EXT4_MB_HINT_BEST 0x0010
Alex Tomasc9de5602008-01-29 00:19:52 -0500110/* data is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400111#define EXT4_MB_HINT_DATA 0x0020
Alex Tomasc9de5602008-01-29 00:19:52 -0500112/* don't preallocate (for tails) */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400113#define EXT4_MB_HINT_NOPREALLOC 0x0040
Alex Tomasc9de5602008-01-29 00:19:52 -0500114/* allocate for locality group */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400115#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
Alex Tomasc9de5602008-01-29 00:19:52 -0500116/* allocate goal blocks or none */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400117#define EXT4_MB_HINT_GOAL_ONLY 0x0100
Alex Tomasc9de5602008-01-29 00:19:52 -0500118/* goal is meaningful */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400119#define EXT4_MB_HINT_TRY_GOAL 0x0200
Mingming Caod2a17632008-07-14 17:52:37 -0400120/* blocks already pre-reserved by delayed allocation */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400121#define EXT4_MB_DELALLOC_RESERVED 0x0400
Theodore Ts'o4ba74d02009-08-09 22:01:13 -0400122/* We are doing stream allocation */
123#define EXT4_MB_STREAM_ALLOC 0x0800
Allison Henderson55f020d2011-05-25 07:41:26 -0400124/* Use reserved root blocks if needed */
125#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
Lukas Czerner27dd4382013-04-09 22:11:22 -0400126/* Use blocks from reserved pool */
127#define EXT4_MB_USE_RESERVED 0x2000
Alex Tomasc9de5602008-01-29 00:19:52 -0500128
129struct ext4_allocation_request {
130 /* target inode for block we're allocating */
131 struct inode *inode;
Alex Tomasc9de5602008-01-29 00:19:52 -0500132 /* how many blocks we want to allocate */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500133 unsigned int len;
Eric Sandeen726447d2009-07-13 10:24:17 -0400134 /* logical block in target inode */
135 ext4_lblk_t logical;
136 /* the closest logical allocated block to the left */
137 ext4_lblk_t lleft;
138 /* the closest logical allocated block to the right */
139 ext4_lblk_t lright;
140 /* phys. target (a hint) */
141 ext4_fsblk_t goal;
142 /* phys. block for the closest logical allocated block to the left */
143 ext4_fsblk_t pleft;
144 /* phys. block for the closest logical allocated block to the right */
145 ext4_fsblk_t pright;
Alex Tomasc9de5602008-01-29 00:19:52 -0500146 /* flags. see above EXT4_MB_HINT_* */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500147 unsigned int flags;
Alex Tomasc9de5602008-01-29 00:19:52 -0500148};
149
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700150/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400151 * Logical to physical block mapping, used by ext4_map_blocks()
152 *
153 * This structure is used to pass requests into ext4_map_blocks() as
154 * well as to store the information returned by ext4_map_blocks(). It
155 * takes less room on the stack than a struct buffer_head.
156 */
157#define EXT4_MAP_NEW (1 << BH_New)
158#define EXT4_MAP_MAPPED (1 << BH_Mapped)
159#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
160#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
161#define EXT4_MAP_UNINIT (1 << BH_Uninit)
Aditya Kali7b415bf2011-09-09 19:04:51 -0400162/* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
163 * ext4_map_blocks wants to know whether or not the underlying cluster has
164 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
165 * the requested mapping was from previously mapped (or delayed allocated)
166 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
167 * should never appear on buffer_head's state flags.
168 */
169#define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400170#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
171 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
Aditya Kali7b415bf2011-09-09 19:04:51 -0400172 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400173
174struct ext4_map_blocks {
175 ext4_fsblk_t m_pblk;
176 ext4_lblk_t m_lblk;
177 unsigned int m_len;
178 unsigned int m_flags;
179};
180
181/*
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400182 * Flags for ext4_io_end->flags
183 */
184#define EXT4_IO_END_UNWRITTEN 0x0001
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400185
Curt Wohlgemuth41881882012-03-05 10:40:22 -0500186/*
Jan Kara6b523df2013-06-04 13:21:11 -0400187 * For converting uninitialized extents on a work queue. 'handle' is used for
188 * buffered writeback.
Curt Wohlgemuth41881882012-03-05 10:40:22 -0500189 */
Mingming Cao00314622009-09-28 15:49:08 -0400190typedef struct ext4_io_end {
jiayingz@google.com (Jiaying Zhang)5b3ff232010-07-27 11:56:06 -0400191 struct list_head list; /* per-file finished IO list */
Jan Kara6b523df2013-06-04 13:21:11 -0400192 handle_t *handle; /* handle reserved for extent
193 * conversion */
Mingming Cao00314622009-09-28 15:49:08 -0400194 struct inode *inode; /* file being written to */
Jan Karab0857d32013-06-04 14:23:41 -0400195 struct bio *bio; /* Linked list of completed
196 * bios covering the extent */
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400197 unsigned int flag; /* unwritten or not */
Eric Sandeena1de02d2010-02-04 23:58:38 -0500198 loff_t offset; /* offset in the file */
199 ssize_t size; /* size of the extent */
Jan Kara97a851e2013-06-04 11:58:58 -0400200 atomic_t count; /* reference counter */
Mingming Cao00314622009-09-28 15:49:08 -0400201} ext4_io_end_t;
202
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400203struct ext4_io_submit {
204 int io_op;
205 struct bio *io_bio;
206 ext4_io_end_t *io_end;
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400207 sector_t io_next_block;
208};
209
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400210/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700211 * Special inodes numbers
212 */
Mingming Cao617ba132006-10-11 01:20:53 -0700213#define EXT4_BAD_INO 1 /* Bad blocks inode */
214#define EXT4_ROOT_INO 2 /* Root inode */
Aditya Kaliae812302011-05-24 19:00:39 -0400215#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
216#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
Mingming Cao617ba132006-10-11 01:20:53 -0700217#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
218#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
219#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
220#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700221
Mingming Cao617ba132006-10-11 01:20:53 -0700222/* First non-reserved inode for old ext4 filesystems */
223#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700224
225/*
226 * Maximal count of links to a file
227 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400228#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700229
230/*
231 * Macro-instructions used to manage several block sizes
232 */
Mingming Cao617ba132006-10-11 01:20:53 -0700233#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -0500234#define EXT4_MAX_BLOCK_SIZE 65536
235#define EXT4_MIN_BLOCK_LOG_SIZE 10
Curt Wohlgemuthfb1813f2010-10-27 21:29:12 -0400236#define EXT4_MAX_BLOCK_LOG_SIZE 16
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700237#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700238# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700239#else
Mingming Cao617ba132006-10-11 01:20:53 -0700240# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700241#endif
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400242#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
Theodore Ts'o281b5992011-09-09 18:34:51 -0400243#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
244 EXT4_SB(s)->s_cluster_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700245#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700246# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Theodore Ts'o281b5992011-09-09 18:34:51 -0400247# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700248#else
Mingming Cao617ba132006-10-11 01:20:53 -0700249# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700250#endif
251#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700252#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
253#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
254#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700255#else
Mingming Cao617ba132006-10-11 01:20:53 -0700256#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
257 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700258 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -0700259#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
260 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700261 (s)->s_first_ino)
262#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400263#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700264
Theodore Ts'od5b8f312011-09-09 18:44:51 -0400265/* Translate a block number to a cluster number */
266#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
267/* Translate a cluster number to a block number */
268#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
269/* Translate # of blks to # of clusters */
270#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
271 (sbi)->s_cluster_bits)
Theodore Ts'of5a44db2013-12-20 09:29:35 -0500272/* Mask out the low bits to get the starting block of the cluster */
273#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
274 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
275#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
276 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
277/* Get the cluster offset */
278#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
279 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
280#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
281 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
Theodore Ts'od5b8f312011-09-09 18:44:51 -0400282
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700283/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700284 * Structure of a blocks group descriptor
285 */
Mingming Cao617ba132006-10-11 01:20:53 -0700286struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700287{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400288 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400289 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
290 __le32 bg_inode_table_lo; /* Inodes table block */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500291 __le16 bg_free_blocks_count_lo;/* Free blocks count */
292 __le16 bg_free_inodes_count_lo;/* Free inodes count */
293 __le16 bg_used_dirs_count_lo; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400294 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
Darrick J. Wonge6153912012-04-29 18:23:10 -0400295 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
296 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
297 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500298 __le16 bg_itable_unused_lo; /* Unused inodes count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400299 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700300 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
301 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
302 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500303 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
304 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
305 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500306 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
Darrick J. Wonge6153912012-04-29 18:23:10 -0400307 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
308 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
309 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
310 __u32 bg_reserved;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700311};
312
Darrick J. Wong41a246d2012-04-29 18:33:10 -0400313#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
314 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
315 sizeof(__le16))
316#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
317 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
318 sizeof(__le16))
319
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400320/*
321 * Structure of a flex block group info
322 */
323
324struct flex_groups {
Theodore Ts'o90ba9832013-03-11 23:39:59 -0400325 atomic64_t free_clusters;
326 atomic_t free_inodes;
327 atomic_t used_dirs;
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400328};
329
Andreas Dilger717d50e2007-10-16 18:38:25 -0400330#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
331#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
332#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
333
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700334/*
335 * Macro-instructions used to manage group descriptors
336 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700337#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700338#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700339#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
340#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700341#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700342# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
Theodore Ts'o281b5992011-09-09 18:34:51 -0400343# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
Mingming Cao617ba132006-10-11 01:20:53 -0700344# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
345# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
346# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700347#else
Mingming Cao617ba132006-10-11 01:20:53 -0700348# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700349# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700350# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700351#endif
352
353/*
354 * Constants relative to the data blocks
355 */
Mingming Cao617ba132006-10-11 01:20:53 -0700356#define EXT4_NDIR_BLOCKS 12
357#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
358#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
359#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
360#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700361
362/*
363 * Inode flags
364 */
Mingming Cao617ba132006-10-11 01:20:53 -0700365#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
366#define EXT4_UNRM_FL 0x00000002 /* Undelete */
367#define EXT4_COMPR_FL 0x00000004 /* Compress file */
368#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
369#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
370#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
371#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
372#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700373/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700374#define EXT4_DIRTY_FL 0x00000100
375#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
376#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
377#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700378/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700379#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
380#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
381#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
382#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
383#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
384#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500385#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
Alex Tomasa86c6182006-10-11 01:21:03 -0700386#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Theodore Ts'of710b4b2010-01-25 03:31:32 -0500387#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500388#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
Tao Ma67cf5b02012-12-10 14:04:46 -0500389#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500390#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700391
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500392#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
Theodore Ts'o996bb9f2013-04-03 22:04:52 -0400393#define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700394
Duane Griffin8fa43a82009-02-15 18:57:26 -0500395/* Flags that should be inherited by new inodes from their parent. */
396#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
Theodore Ts'o1cd9f092011-08-31 11:54:51 -0400397 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
Duane Griffin8fa43a82009-02-15 18:57:26 -0500398 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
399 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
400
Duane Griffin2dc6b0d2009-02-15 18:09:20 -0500401/* Flags that are appropriate for regular files (all but dir-specific ones). */
402#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
403
404/* Flags that are appropriate for non-directories/regular files. */
405#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
406
407/* Mask out flags that are inappropriate for the given type of inode. */
408static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
409{
410 if (S_ISDIR(mode))
411 return flags;
412 else if (S_ISREG(mode))
413 return flags & EXT4_REG_FLMASK;
414 else
415 return flags & EXT4_OTHER_FLMASK;
416}
417
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400418/*
419 * Inode flags used for atomic set/get
420 */
421enum {
422 EXT4_INODE_SECRM = 0, /* Secure deletion */
423 EXT4_INODE_UNRM = 1, /* Undelete */
424 EXT4_INODE_COMPR = 2, /* Compress file */
425 EXT4_INODE_SYNC = 3, /* Synchronous updates */
426 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
427 EXT4_INODE_APPEND = 5, /* writes to file may only append */
428 EXT4_INODE_NODUMP = 6, /* do not dump file */
429 EXT4_INODE_NOATIME = 7, /* do not update atime */
430/* Reserved for compression usage... */
431 EXT4_INODE_DIRTY = 8,
432 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
433 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
434 EXT4_INODE_ECOMPR = 11, /* Compression error */
435/* End compression flags --- maybe not all used */
436 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
437 EXT4_INODE_IMAGIC = 13, /* AFS directory */
438 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
439 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
440 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
441 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
442 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
443 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
444 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
445 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
Tao Ma67cf5b02012-12-10 14:04:46 -0500446 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400447 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
448};
449
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400450/*
Carlos Maiolino9a4c8012012-12-10 16:30:45 -0500451 * Since it's pretty easy to mix up bit numbers and hex values, we use a
452 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
453 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
454 * any extra space in the compiled kernel image, otherwise, the build will fail.
455 * It's important that these values are the same, since we are using
456 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
457 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
458 * values found in ext2, ext3 and ext4 filesystems, and of course the values
459 * defined in e2fsprogs.
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400460 *
461 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
462 */
Carlos Maiolino9a4c8012012-12-10 16:30:45 -0500463#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
464#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
465
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400466static inline void ext4_check_flag_values(void)
467{
468 CHECK_FLAG_VALUE(SECRM);
469 CHECK_FLAG_VALUE(UNRM);
470 CHECK_FLAG_VALUE(COMPR);
471 CHECK_FLAG_VALUE(SYNC);
472 CHECK_FLAG_VALUE(IMMUTABLE);
473 CHECK_FLAG_VALUE(APPEND);
474 CHECK_FLAG_VALUE(NODUMP);
475 CHECK_FLAG_VALUE(NOATIME);
476 CHECK_FLAG_VALUE(DIRTY);
477 CHECK_FLAG_VALUE(COMPRBLK);
478 CHECK_FLAG_VALUE(NOCOMPR);
479 CHECK_FLAG_VALUE(ECOMPR);
480 CHECK_FLAG_VALUE(INDEX);
481 CHECK_FLAG_VALUE(IMAGIC);
482 CHECK_FLAG_VALUE(JOURNAL_DATA);
483 CHECK_FLAG_VALUE(NOTAIL);
484 CHECK_FLAG_VALUE(DIRSYNC);
485 CHECK_FLAG_VALUE(TOPDIR);
486 CHECK_FLAG_VALUE(HUGE_FILE);
487 CHECK_FLAG_VALUE(EXTENTS);
488 CHECK_FLAG_VALUE(EA_INODE);
489 CHECK_FLAG_VALUE(EOFBLOCKS);
Tao Ma67cf5b02012-12-10 14:04:46 -0500490 CHECK_FLAG_VALUE(INLINE_DATA);
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400491 CHECK_FLAG_VALUE(RESERVED);
492}
493
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700494/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700495struct ext4_new_group_input {
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400496 __u32 group; /* Group number for this data */
497 __u64 block_bitmap; /* Absolute block number of block bitmap */
498 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
499 __u64 inode_table; /* Absolute block number of inode table start */
500 __u32 blocks_count; /* Total number of blocks in this group */
501 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700502 __u16 unused;
503};
504
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400505#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
506struct compat_ext4_new_group_input {
507 u32 group;
508 compat_u64 block_bitmap;
509 compat_u64 inode_bitmap;
510 compat_u64 inode_table;
511 u32 blocks_count;
512 u16 reserved_blocks;
513 u16 unused;
514};
515#endif
516
Mingming Cao617ba132006-10-11 01:20:53 -0700517/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
518struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700519 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700520 __u64 block_bitmap;
521 __u64 inode_bitmap;
522 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700523 __u32 blocks_count;
524 __u16 reserved_blocks;
525 __u16 unused;
526 __u32 free_blocks_count;
527};
528
Yongqiang Yang33afdcc2012-01-03 23:32:52 -0500529/* Indexes used to index group tables in ext4_new_group_data */
530enum {
531 BLOCK_BITMAP = 0, /* block bitmap */
532 INODE_BITMAP, /* inode bitmap */
533 INODE_TABLE, /* inode tables */
534 GROUP_TABLE_COUNT,
535};
536
Amit Aroraa2df2a62007-07-17 21:42:41 -0400537/*
Eric Sandeen79e83032010-07-27 11:56:07 -0400538 * Flags used by ext4_map_blocks()
Amit Aroraa2df2a62007-07-17 21:42:41 -0400539 */
Theodore Ts'oc2177052009-05-14 00:58:52 -0400540 /* Allocate any needed blocks and/or convert an unitialized
541 extent to be an initialized ext4 */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400542#define EXT4_GET_BLOCKS_CREATE 0x0001
Theodore Ts'oc2177052009-05-14 00:58:52 -0400543 /* Request the creation of an unitialized extent */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400544#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
Theodore Ts'oc2177052009-05-14 00:58:52 -0400545#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
546 EXT4_GET_BLOCKS_CREATE)
Lukas Czerner27dd4382013-04-09 22:11:22 -0400547 /* Caller is from the delayed allocation writeout path
548 * finally doing the actual allocation of delayed blocks */
Jan Kara03f5d8b2009-06-09 00:17:05 -0400549#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
Mingming Cao00314622009-09-28 15:49:08 -0400550 /* caller is from the direct IO path, request to creation of an
551 unitialized extents if not allocated, split the uninitialized
552 extent if blocks has been preallocated already*/
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500553#define EXT4_GET_BLOCKS_PRE_IO 0x0008
Aneesh Kumar K.V1296cc82010-01-15 01:27:59 -0500554#define EXT4_GET_BLOCKS_CONVERT 0x0010
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500555#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
Mingming Cao00314622009-09-28 15:49:08 -0400556 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500557 /* Convert extent to initialized after IO complete */
558#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
Jiaying Zhang744692d2010-03-04 16:14:02 -0500559 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
Lukas Czerner27dd4382013-04-09 22:11:22 -0400560 /* Eventual metadata allocation (due to growing extent tree)
561 * should not fail, so try to use reserved blocks for that.*/
562#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
Vivek Haldar556b27a2011-05-25 07:41:54 -0400563 /* Don't normalize allocation size (used for fallocate) */
564#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
Dmitry Monakhova4e5d882011-10-25 08:15:12 -0400565 /* Request will not result in inode size update (user for fallocate) */
566#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
Zheng Liu729f52c2012-07-09 16:29:29 -0400567 /* Do not take i_data_sem locking in ext4_map_blocks */
568#define EXT4_GET_BLOCKS_NO_LOCK 0x0100
Zheng Liud100eef2013-02-18 00:29:59 -0500569 /* Do not put hole in extent cache */
570#define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200
Lukas Czernerb8a86842014-03-18 18:05:35 -0400571 /* Convert written extents to unwritten */
572#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0400
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700573
574/*
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400575 * The bit position of these flags must not overlap with any of the
576 * EXT4_GET_BLOCKS_*. They are used by ext4_ext_find_extent(),
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400577 * read_extent_tree_block(), ext4_split_extent_at(),
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400578 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
579 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
580 * caching the extents when reading from the extent tree while a
581 * truncate or punch hole operation is in progress.
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400582 */
583#define EXT4_EX_NOCACHE 0x0400
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400584#define EXT4_EX_FORCE_CACHE 0x0800
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400585
586/*
Theodore Ts'oe6362602009-11-23 07:17:05 -0500587 * Flags used by ext4_free_blocks
588 */
589#define EXT4_FREE_BLOCKS_METADATA 0x0001
590#define EXT4_FREE_BLOCKS_FORGET 0x0002
Theodore Ts'o1f2acb62010-01-22 17:40:42 -0500591#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
Maxim Patlasov7132de72011-07-10 19:37:48 -0400592#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
Theodore Ts'o84130192011-09-09 18:50:51 -0400593#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
594#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
Jan Kara7d734532013-08-17 09:36:54 -0400595#define EXT4_FREE_BLOCKS_RESERVE 0x0040
Theodore Ts'oe6362602009-11-23 07:17:05 -0500596
597/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700598 * ioctl commands
599 */
Mingming Cao617ba132006-10-11 01:20:53 -0700600#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
601#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
602#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
603#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
Mingming Cao617ba132006-10-11 01:20:53 -0700604#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
605#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Mingming Cao617ba132006-10-11 01:20:53 -0700606#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
607#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400608#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
609#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
610#define EXT4_IOC_MIGRATE _IO('f', 9)
Theodore Ts'occd25062009-02-26 01:04:07 -0500611 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400612 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
Theodore Ts'occd25062009-02-26 01:04:07 -0500613#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
Akira Fujita748de672009-06-17 19:24:03 -0400614#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
Yongqiang Yang19c52462012-01-04 17:09:44 -0500615#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400616#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400617#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700618
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400619#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700620/*
621 * ioctl commands in 32 bit emulation
622 */
Mingming Cao617ba132006-10-11 01:20:53 -0700623#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
624#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
625#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
626#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
627#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
628#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
629#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400630#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
Mingming Cao617ba132006-10-11 01:20:53 -0700631#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
632#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400633#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700634
Uwe Kleine-Königb5950762010-11-01 15:38:34 -0400635/* Max physical block we can address w/o extents */
Eric Sandeenfb0a3872009-09-16 14:45:10 -0400636#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
637
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700638/*
639 * Structure of an inode on the disk
640 */
Mingming Cao617ba132006-10-11 01:20:53 -0700641struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700642 __le16 i_mode; /* File mode */
643 __le16 i_uid; /* Low 16 bits of Owner Uid */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500644 __le32 i_size_lo; /* Size in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700645 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400646 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700647 __le32 i_mtime; /* Modification time */
648 __le32 i_dtime; /* Deletion Time */
649 __le16 i_gid; /* Low 16 bits of Group Id */
650 __le16 i_links_count; /* Links count */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500651 __le32 i_blocks_lo; /* Blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700652 __le32 i_flags; /* File flags */
653 union {
654 struct {
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500655 __le32 l_i_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700656 } linux1;
657 struct {
658 __u32 h_i_translator;
659 } hurd1;
660 struct {
661 __u32 m_i_reserved1;
662 } masix1;
663 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700664 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700665 __le32 i_generation; /* File version (for NFS) */
Aneesh Kumar K.V7973c0c2008-01-28 23:58:27 -0500666 __le32 i_file_acl_lo; /* File ACL */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500667 __le32 i_size_high;
Coly Lif077d0d2007-10-16 18:38:25 -0400668 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700669 union {
670 struct {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500671 __le16 l_i_blocks_high; /* were l_i_reserved1 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700672 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400673 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700674 __le16 l_i_gid_high; /* were reserved2[0] */
Darrick J. Wonge6153912012-04-29 18:23:10 -0400675 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
676 __le16 l_i_reserved;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700677 } linux2;
678 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400679 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700680 __u16 h_i_mode_high;
681 __u16 h_i_uid_high;
682 __u16 h_i_gid_high;
683 __u32 h_i_author;
684 } hurd2;
685 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400686 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700687 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700688 __u32 m_i_reserved2[2];
689 } masix2;
690 } osd2; /* OS dependent 2 */
691 __le16 i_extra_isize;
Darrick J. Wonge6153912012-04-29 18:23:10 -0400692 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400693 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
694 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
695 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
696 __le32 i_crtime; /* File Creation time */
697 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500698 __le32 i_version_hi; /* high 32 bits for 64-bit version */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700699};
700
Akira Fujita748de672009-06-17 19:24:03 -0400701struct move_extent {
702 __u32 reserved; /* should be zero */
703 __u32 donor_fd; /* donor file descriptor */
704 __u64 orig_start; /* logical start offset in block for orig */
705 __u64 donor_start; /* logical start offset in block for donor */
706 __u64 len; /* block length to be moved */
707 __u64 moved_len; /* moved block length */
708};
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700709
Kalpak Shahef7f3832007-07-18 09:15:20 -0400710#define EXT4_EPOCH_BITS 2
711#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
712#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
713
714/*
715 * Extended fields will fit into an inode if the filesystem was formatted
716 * with large inodes (-I 256 or larger) and there are not currently any EAs
717 * consuming all of the available space. For new inodes we always reserve
718 * enough space for the kernel's known extended fields, but for inodes
719 * created with an old kernel this might not have been the case. None of
720 * the extended inode fields is critical for correct filesystem operation.
721 * This macro checks if a certain field fits in the inode. Note that
722 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
723 */
724#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
725 ((offsetof(typeof(*ext4_inode), field) + \
726 sizeof((ext4_inode)->field)) \
727 <= (EXT4_GOOD_OLD_INODE_SIZE + \
728 (einode)->i_extra_isize)) \
729
730static inline __le32 ext4_encode_extra_time(struct timespec *time)
731{
732 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400733 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
734 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
Kalpak Shahef7f3832007-07-18 09:15:20 -0400735}
736
737static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
738{
739 if (sizeof(time->tv_sec) > 4)
740 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
741 << 32;
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400742 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400743}
744
745#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
746do { \
747 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
748 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
749 (raw_inode)->xtime ## _extra = \
750 ext4_encode_extra_time(&(inode)->xtime); \
751} while (0)
752
753#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
754do { \
755 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
756 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
757 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
758 (raw_inode)->xtime ## _extra = \
759 ext4_encode_extra_time(&(einode)->xtime); \
760} while (0)
761
762#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
763do { \
764 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
765 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
766 ext4_decode_extra_time(&(inode)->xtime, \
767 raw_inode->xtime ## _extra); \
Eric Sandeenaf0b44a2010-12-19 22:10:31 -0500768 else \
769 (inode)->xtime.tv_nsec = 0; \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400770} while (0)
771
772#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
773do { \
774 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
775 (einode)->xtime.tv_sec = \
776 (signed)le32_to_cpu((raw_inode)->xtime); \
Theodore Ts'o19ea8062014-02-16 19:29:32 -0500777 else \
778 (einode)->xtime.tv_sec = 0; \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400779 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
780 ext4_decode_extra_time(&(einode)->xtime, \
781 raw_inode->xtime ## _extra); \
Eric Sandeenaf0b44a2010-12-19 22:10:31 -0500782 else \
783 (einode)->xtime.tv_nsec = 0; \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400784} while (0)
785
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500786#define i_disk_version osd1.linux1.l_i_version
787
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700788#if defined(__KERNEL__) || defined(__linux__)
789#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700790#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500791#define i_blocks_high osd2.linux2.l_i_blocks_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700792#define i_uid_low i_uid
793#define i_gid_low i_gid
794#define i_uid_high osd2.linux2.l_i_uid_high
795#define i_gid_high osd2.linux2.l_i_gid_high
Darrick J. Wonge6153912012-04-29 18:23:10 -0400796#define i_checksum_lo osd2.linux2.l_i_checksum_lo
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700797
798#elif defined(__GNU__)
799
800#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700801#define i_uid_high osd2.hurd2.h_i_uid_high
802#define i_gid_high osd2.hurd2.h_i_gid_high
803#define i_author osd2.hurd2.h_i_author
804
805#elif defined(__masix__)
806
807#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700808#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700809#define i_reserved2 osd2.masix2.m_i_reserved2
810
811#endif /* defined(__KERNEL__) || defined(__linux__) */
812
Zheng Liuc0677e62012-11-08 15:18:54 -0500813#include "extents_status.h"
814
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400815/*
816 * fourth extended file system inode data in memory
817 */
818struct ext4_inode_info {
819 __le32 i_data[15]; /* unconverted */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400820 __u32 i_dtime;
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400821 ext4_fsblk_t i_file_acl;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400822
823 /*
824 * i_block_group is the number of the block group which contains
825 * this file's inode. Constant across the lifetime of the inode,
826 * it is ued for making block allocation decisions - we try to
827 * place a file's data blocks near its inode block, and new inodes
828 * near to their parent directory's inode.
829 */
830 ext4_group_t i_block_group;
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500831 ext4_lblk_t i_dir_start_lookup;
Theodore Ts'o353eb832011-01-10 12:18:25 -0500832#if (BITS_PER_LONG < 64)
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500833 unsigned long i_state_flags; /* Dynamic state flags */
Theodore Ts'o353eb832011-01-10 12:18:25 -0500834#endif
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400835 unsigned long i_flags;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400836
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400837 /*
838 * Extended attributes can be read independently of the main file
839 * data. Taking i_mutex even when reading would cause contention
840 * between readers of EAs and writers of regular file data, so
841 * instead we synchronize on xattr_sem when reading or changing
842 * EAs.
843 */
844 struct rw_semaphore xattr_sem;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400845
846 struct list_head i_orphan; /* unlinked but open inodes */
847
848 /*
849 * i_disksize keeps track of what the inode size is ON DISK, not
850 * in memory. During truncate, i_size is set to the new size by
851 * the VFS prior to calling ext4_truncate(), but the filesystem won't
852 * set i_disksize to 0 until the truncate is actually under way.
853 *
854 * The intent is that i_disksize always represents the blocks which
855 * are used by this file. This allows recovery to restart truncate
856 * on orphans if we crash during truncate. We actually write i_disksize
857 * into the on-disk inode when writing inodes out, instead of i_size.
858 *
859 * The only time when i_disksize and i_size may be different is when
860 * a truncate is in progress. The only things which change i_disksize
861 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
862 */
863 loff_t i_disksize;
864
865 /*
866 * i_data_sem is for serialising ext4_truncate() against
867 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
868 * data tree are chopped off during truncate. We can't do that in
869 * ext4 because whenever we perform intermediate commits during
870 * truncate, the inode and all the metadata blocks *must* be in a
871 * consistent state which allows truncation of the orphans to restart
872 * during recovery. Hence we must fix the get_block-vs-truncate race
873 * by other means, so we have i_data_sem.
874 */
875 struct rw_semaphore i_data_sem;
876 struct inode vfs_inode;
Theodore Ts'o8aefcd52011-01-10 12:29:43 -0500877 struct jbd2_inode *jinode;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400878
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400879 /*
880 * File creation time. Its function is same as that of
881 * struct timespec i_{a,c,m}time in the generic inode.
882 */
883 struct timespec i_crtime;
884
885 /* mballoc */
886 struct list_head i_prealloc_list;
887 spinlock_t i_prealloc_lock;
888
Zheng Liuc0677e62012-11-08 15:18:54 -0500889 /* extents status tree */
890 struct ext4_es_tree i_es_tree;
891 rwlock_t i_es_lock;
Zheng Liu74cd15c2013-02-18 00:32:55 -0500892 struct list_head i_es_lru;
893 unsigned int i_es_lru_nr; /* protected by i_es_lock */
Zheng Liud3922a72013-07-01 08:12:37 -0400894 unsigned long i_touch_when; /* jiffies of last accessing */
Zheng Liuc0677e62012-11-08 15:18:54 -0500895
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400896 /* ialloc */
897 ext4_group_t i_last_alloc_group;
898
899 /* allocation reservation info for delalloc */
Theodore Ts'o57042652011-09-09 18:56:51 -0400900 /* In case of bigalloc, these refer to clusters rather than blocks */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400901 unsigned int i_reserved_data_blocks;
902 unsigned int i_reserved_meta_blocks;
903 unsigned int i_allocated_meta_blocks;
Theodore Ts'o01f49d02011-01-10 12:13:03 -0500904 ext4_lblk_t i_da_metadata_calc_last_lblock;
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500905 int i_da_metadata_calc_len;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400906
907 /* on-disk additional length */
908 __u16 i_extra_isize;
909
Tao Ma67cf5b02012-12-10 14:04:46 -0500910 /* Indicate the inline data space. */
911 u16 i_inline_off;
912 u16 i_inline_size;
913
Dmitry Monakhova9e7f442009-12-14 15:21:14 +0300914#ifdef CONFIG_QUOTA
915 /* quota space reservation, managed internally by quota code */
916 qsize_t i_reserved_quota;
917#endif
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400918
Jan Kara2e8fa542013-06-04 14:21:02 -0400919 /* Lock protecting lists below */
Jiaying Zhang744692d2010-03-04 16:14:02 -0500920 spinlock_t i_completed_io_lock;
Jan Kara2e8fa542013-06-04 14:21:02 -0400921 /*
922 * Completed IOs that need unwritten extents handling and have
923 * transaction reserved
924 */
925 struct list_head i_rsv_conversion_list;
926 /*
927 * Completed IOs that need unwritten extents handling and don't have
928 * transaction reserved
929 */
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500930 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
Dmitry Monakhove27f41e2012-09-28 23:24:52 -0400931 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
Jan Kara2e8fa542013-06-04 14:21:02 -0400932 struct work_struct i_rsv_conversion_work;
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500933
934 spinlock_t i_block_reservation_lock;
Jan Karab436b9b2009-12-08 23:51:10 -0500935
936 /*
937 * Transactions that contain inode's metadata needed to complete
938 * fsync and fdatasync, respectively.
939 */
940 tid_t i_sync_tid;
941 tid_t i_datasync_tid;
Darrick J. Wong814525f2012-04-29 18:31:10 -0400942
943 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
944 __u32 i_csum_seed;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400945};
946
947/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700948 * File system states
949 */
Mingming Cao617ba132006-10-11 01:20:53 -0700950#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
951#define EXT4_ERROR_FS 0x0002 /* Errors detected */
952#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700953
954/*
Theodore Tso469108f2008-02-10 01:11:44 -0500955 * Misc. filesystem flags
956 */
957#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
958#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
959#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
960
961/*
Lukas Czerner68911002013-04-03 22:12:52 -0400962 * Mount flags set via mount options or defaults
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700963 */
Mingming Cao617ba132006-10-11 01:20:53 -0700964#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
965#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
966#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
967#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
968#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
Theodore Ts'o39ef17f2012-03-03 17:56:23 -0500969#define EXT4_MOUNT_ERRORS_MASK 0x00070
Mingming Cao617ba132006-10-11 01:20:53 -0700970#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
971#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
Mingming Cao617ba132006-10-11 01:20:53 -0700972#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
973#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
974#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
975#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
976#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
977#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
978#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
979#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
Theodore Ts'oafd46722009-03-16 23:12:23 -0400980#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
Mingming Cao617ba132006-10-11 01:20:53 -0700981#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
Mingming Cao617ba132006-10-11 01:20:53 -0700982#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
983#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
984#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Jiaying Zhang744692d2010-03-04 16:14:02 -0500985#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
Linus Torvaldsd4da6c92009-11-02 10:15:27 -0800986#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500987#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
Alex Tomas64769242008-07-11 19:27:31 -0400988#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400989#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400990#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
Eric Sandeen5328e632009-11-19 14:25:42 -0500991#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
Lukas Czernerbfff6872010-10-27 21:30:05 -0400992#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400993
Lukas Czerner68911002013-04-03 22:12:52 -0400994/*
995 * Mount flags set either automatically (could not be set by mount option)
996 * based on per file system feature or property or in special cases such as
997 * distinguishing between explicit mount option definition and default.
998 */
Theodore Ts'o56889782011-09-03 18:22:38 -0400999#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1000 specified delalloc */
Lukas Czerner68911002013-04-03 22:12:52 -04001001#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1002 size of blocksize * 8
1003 blocks */
Theodore Ts'oed3654e2014-03-24 14:09:06 -04001004#define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1005 file systems */
Theodore Ts'o56889782011-09-03 18:22:38 -04001006
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05001007#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1008 ~EXT4_MOUNT_##opt
1009#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1010 EXT4_MOUNT_##opt
Mingming Cao617ba132006-10-11 01:20:53 -07001011#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1012 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001013
Theodore Ts'oa2595b82010-12-15 20:30:48 -05001014#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1015 ~EXT4_MOUNT2_##opt
1016#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1017 EXT4_MOUNT2_##opt
1018#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1019 EXT4_MOUNT2_##opt)
1020
Akinobu Mita597d5082011-12-28 20:32:07 -05001021#define ext4_test_and_set_bit __test_and_set_bit_le
1022#define ext4_set_bit __set_bit_le
Mingming Cao617ba132006-10-11 01:20:53 -07001023#define ext4_set_bit_atomic ext2_set_bit_atomic
Akinobu Mita597d5082011-12-28 20:32:07 -05001024#define ext4_test_and_clear_bit __test_and_clear_bit_le
1025#define ext4_clear_bit __clear_bit_le
Mingming Cao617ba132006-10-11 01:20:53 -07001026#define ext4_clear_bit_atomic ext2_clear_bit_atomic
Akinobu Mita50e01682011-03-23 16:42:07 -07001027#define ext4_test_bit test_bit_le
Akinobu Mita50e01682011-03-23 16:42:07 -07001028#define ext4_find_next_zero_bit find_next_zero_bit_le
1029#define ext4_find_next_bit find_next_bit_le
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001030
Yongqiang Yangc3e94d12011-07-26 22:05:53 -04001031extern void ext4_set_bits(void *bm, int cur, int len);
1032
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001033/*
1034 * Maximal mount counts between two filesystem checks
1035 */
Mingming Cao617ba132006-10-11 01:20:53 -07001036#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1037#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001038
1039/*
1040 * Behaviour when detecting errors
1041 */
Mingming Cao617ba132006-10-11 01:20:53 -07001042#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1043#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1044#define EXT4_ERRORS_PANIC 3 /* Panic */
1045#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001046
Darrick J. Wonge6153912012-04-29 18:23:10 -04001047/* Metadata checksum algorithm codes */
1048#define EXT4_CRC32C_CHKSUM 1
1049
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001050/*
1051 * Structure of the super block
1052 */
Mingming Cao617ba132006-10-11 01:20:53 -07001053struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001054/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001055 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001056 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1057 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001058/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1059 __le32 s_first_data_block; /* First Data Block */
1060 __le32 s_log_block_size; /* Block size */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001061 __le32 s_log_cluster_size; /* Allocation cluster size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001062/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001063 __le32 s_clusters_per_group; /* # Clusters per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001064 __le32 s_inodes_per_group; /* # Inodes per group */
1065 __le32 s_mtime; /* Mount time */
1066/*30*/ __le32 s_wtime; /* Write time */
1067 __le16 s_mnt_count; /* Mount count */
1068 __le16 s_max_mnt_count; /* Maximal mount count */
1069 __le16 s_magic; /* Magic signature */
1070 __le16 s_state; /* File system state */
1071 __le16 s_errors; /* Behaviour when detecting errors */
1072 __le16 s_minor_rev_level; /* minor revision level */
1073/*40*/ __le32 s_lastcheck; /* time of last check */
1074 __le32 s_checkinterval; /* max. time between checks */
1075 __le32 s_creator_os; /* OS */
1076 __le32 s_rev_level; /* Revision level */
1077/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1078 __le16 s_def_resgid; /* Default gid for reserved blocks */
1079 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001080 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001081 *
1082 * Note: the difference between the compatible feature set and
1083 * the incompatible feature set is that if there is a bit set
1084 * in the incompatible feature set that the kernel doesn't
1085 * know about, it should refuse to mount the filesystem.
1086 *
1087 * e2fsck's requirements are more strict; if it doesn't know
1088 * about a feature in either the compatible or incompatible
1089 * feature set, it must abort and not try to meddle with
1090 * things it doesn't understand...
1091 */
1092 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001093 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001094 __le16 s_block_group_nr; /* block group # of this superblock */
1095 __le32 s_feature_compat; /* compatible feature set */
1096/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1097 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1098/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1099/*78*/ char s_volume_name[16]; /* volume name */
1100/*88*/ char s_last_mounted[64]; /* directory where last mounted */
1101/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1102 /*
1103 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -07001104 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001105 */
1106 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1107 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1108 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1109 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001110 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001111 */
1112/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1113/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1114 __le32 s_journal_dev; /* device number of journal file */
1115 __le32 s_last_orphan; /* start of list of inodes to delete */
1116 __le32 s_hash_seed[4]; /* HTREE hash seed */
1117 __u8 s_def_hash_version; /* Default hash version to use */
Theodore Ts'o89eeddf2010-07-27 11:56:04 -04001118 __u8 s_jnl_backup_type;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001119 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001120/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001121 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001122 __le32 s_mkfs_time; /* When the filesystem was created */
1123 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1124 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1125/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1126 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1127 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -04001128 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1129 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1130 __le32 s_flags; /* Miscellaneous flags */
1131 __le16 s_raid_stride; /* RAID stride */
Johann Lombardic5e06d12011-05-24 18:31:25 -04001132 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -04001133 __le64 s_mmp_block; /* Block for multi-mount protection */
1134 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001135 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
Darrick J. Wonge6153912012-04-29 18:23:10 -04001136 __u8 s_checksum_type; /* metadata checksum algorithm used */
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001137 __le16 s_reserved_pad;
Theodore Ts'oafc32f72009-02-28 19:39:58 -05001138 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
Theodore Ts'o4a9cdec2010-06-29 11:00:23 -04001139 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1140 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1141 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1142 snapshot's future use */
1143 __le32 s_snapshot_list; /* inode number of the head of the
1144 on-disk snapshot list */
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04001145#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1146 __le32 s_error_count; /* number of fs errors */
1147 __le32 s_first_error_time; /* first time an error happened */
1148 __le32 s_first_error_ino; /* inode involved in first error */
1149 __le64 s_first_error_block; /* block involved of first error */
1150 __u8 s_first_error_func[32]; /* function where the error happened */
1151 __le32 s_first_error_line; /* line number where error happened */
1152 __le32 s_last_error_time; /* most recent time of an error */
1153 __le32 s_last_error_ino; /* inode involved in last error */
1154 __le32 s_last_error_line; /* line number where error happened */
1155 __le64 s_last_error_block; /* block involved of last error */
1156 __u8 s_last_error_func[32]; /* function where the error happened */
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001157#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1158 __u8 s_mount_opts[64];
Theodore Ts'o281b5992011-09-09 18:34:51 -04001159 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1160 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1161 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
Darrick J. Wonge6153912012-04-29 18:23:10 -04001162 __le32 s_reserved[108]; /* Padding to the end of the block */
1163 __le32 s_checksum; /* crc32c(superblock) */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001164};
1165
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04001166#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1167
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001168#ifdef __KERNEL__
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001169
1170/*
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001171 * run-time mount flags
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001172 */
1173#define EXT4_MF_MNTDIR_SAMPLED 0x0001
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001174#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001175
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001176/*
1177 * fourth extended-fs super-block data in memory
1178 */
1179struct ext4_sb_info {
1180 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1181 unsigned long s_inodes_per_block;/* Number of inodes per block */
1182 unsigned long s_blocks_per_group;/* Number of blocks in a group */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001183 unsigned long s_clusters_per_group; /* Number of clusters in a group */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001184 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1185 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1186 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1187 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1188 ext4_group_t s_groups_count; /* Number of groups in the fs */
Eric Sandeenfb0a3872009-09-16 14:45:10 -04001189 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
Theodore Ts'o952fc182012-07-09 16:27:05 -04001190 unsigned long s_overhead; /* # of fs overhead clusters */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001191 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1192 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001193 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1194 struct buffer_head * s_sbh; /* Buffer containing the super block */
1195 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1196 struct buffer_head **s_group_desc;
Theodore Ts'o7f4520c2009-06-13 10:09:41 -04001197 unsigned int s_mount_opt;
Theodore Ts'oa2595b82010-12-15 20:30:48 -05001198 unsigned int s_mount_opt2;
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001199 unsigned int s_mount_flags;
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001200 unsigned int s_def_mount_opt;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001201 ext4_fsblk_t s_sb_block;
Lukas Czerner27dd4382013-04-09 22:11:22 -04001202 atomic64_t s_resv_clusters;
Eric W. Biederman08cefc72012-02-07 15:41:49 -08001203 kuid_t s_resuid;
1204 kgid_t s_resgid;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001205 unsigned short s_mount_state;
1206 unsigned short s_pad;
1207 int s_addr_per_block_bits;
1208 int s_desc_per_block_bits;
1209 int s_inode_size;
1210 int s_first_ino;
1211 unsigned int s_inode_readahead_blks;
Andreas Dilger11013912009-06-13 11:45:35 -04001212 unsigned int s_inode_goal;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001213 spinlock_t s_next_gen_lock;
1214 u32 s_next_generation;
1215 u32 s_hash_seed[4];
1216 int s_def_hash_version;
1217 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
Theodore Ts'o57042652011-09-09 18:56:51 -04001218 struct percpu_counter s_freeclusters_counter;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001219 struct percpu_counter s_freeinodes_counter;
1220 struct percpu_counter s_dirs_counter;
Theodore Ts'o57042652011-09-09 18:56:51 -04001221 struct percpu_counter s_dirtyclusters_counter;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001222 struct blockgroup_lock *s_blockgroup_lock;
1223 struct proc_dir_entry *s_proc;
1224 struct kobject s_kobj;
1225 struct completion s_kobj_unregister;
Theodore Ts'o2c0544b2012-05-30 22:56:46 -04001226 struct super_block *s_sb;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001227
1228 /* Journaling */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001229 struct journal_s *s_journal;
1230 struct list_head s_orphan;
1231 struct mutex s_orphan_lock;
Yongqiang Yang8f82f842011-07-26 21:35:44 -04001232 unsigned long s_resize_flags; /* Flags indicating if there
1233 is a resizer */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001234 unsigned long s_commit_interval;
1235 u32 s_max_batch_time;
1236 u32 s_min_batch_time;
1237 struct block_device *journal_bdev;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001238#ifdef CONFIG_QUOTA
1239 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1240 int s_jquota_fmt; /* Format of quota to use */
1241#endif
1242 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001243 struct rb_root system_blks;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001244
1245#ifdef EXTENTS_STATS
1246 /* ext4 extents stats */
1247 unsigned long s_ext_min;
1248 unsigned long s_ext_max;
1249 unsigned long s_depth_max;
1250 spinlock_t s_ext_stats_lock;
1251 unsigned long s_ext_blocks;
1252 unsigned long s_ext_extents;
1253#endif
1254
1255 /* for buddy allocator */
1256 struct ext4_group_info ***s_group_info;
1257 struct inode *s_buddy_cache;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001258 spinlock_t s_md_lock;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001259 unsigned short *s_mb_offsets;
1260 unsigned int *s_mb_maxs;
Theodore Ts'o28623c22012-09-05 01:31:50 -04001261 unsigned int s_group_info_size;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001262
1263 /* tunables */
1264 unsigned long s_stripe;
1265 unsigned int s_mb_stream_request;
1266 unsigned int s_mb_max_to_scan;
1267 unsigned int s_mb_min_to_scan;
1268 unsigned int s_mb_stats;
1269 unsigned int s_mb_order2_reqs;
1270 unsigned int s_mb_group_prealloc;
Theodore Ts'odf981d02012-08-17 09:48:17 -04001271 unsigned int s_max_dir_size_kb;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001272 /* where last allocation was done - for stream allocation */
1273 unsigned long s_mb_last_group;
1274 unsigned long s_mb_last_start;
1275
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001276 /* stats for buddy allocator */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001277 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1278 atomic_t s_bal_success; /* we found long enough chunks */
1279 atomic_t s_bal_allocated; /* in blocks */
1280 atomic_t s_bal_ex_scanned; /* total extents scanned */
1281 atomic_t s_bal_goals; /* goal hits */
1282 atomic_t s_bal_breaks; /* too long searches */
1283 atomic_t s_bal_2orders; /* 2^order hits */
1284 spinlock_t s_bal_lock;
1285 unsigned long s_mb_buddies_generated;
1286 unsigned long long s_mb_generation_time;
1287 atomic_t s_mb_lost_chunks;
1288 atomic_t s_mb_preallocated;
1289 atomic_t s_mb_discarded;
Theodore Ts'o50797482009-09-18 13:34:02 -04001290 atomic_t s_lock_busy;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001291
1292 /* locality groups */
Tejun Heo003cb602010-02-02 14:39:01 +09001293 struct ext4_locality_group __percpu *s_locality_groups;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001294
1295 /* for write statistics */
1296 unsigned long s_sectors_written_start;
1297 u64 s_kbytes_written;
1298
Zheng Liu67a5da52012-08-17 09:54:17 -04001299 /* the size of zero-out chunk */
1300 unsigned int s_extent_max_zeroout_kb;
1301
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001302 unsigned int s_log_groups_per_flex;
1303 struct flex_groups *s_flex_groups;
Theodore Ts'o117fff12012-09-05 01:29:50 -04001304 ext4_group_t s_flex_groups_allocated;
Mingming Cao4c0425f2009-09-28 15:48:41 -04001305
Jan Kara2e8fa542013-06-04 14:21:02 -04001306 /* workqueue for reserved extent conversions (buffered io) */
1307 struct workqueue_struct *rsv_conversion_wq;
Theodore Ts'o66e61a92010-07-27 11:56:04 -04001308
1309 /* timer for periodic error stats printing */
1310 struct timer_list s_err_report;
Lukas Czernerbfff6872010-10-27 21:30:05 -04001311
1312 /* Lazy inode table initialization info */
1313 struct ext4_li_request *s_li_request;
1314 /* Wait multiplier for lazy initialization thread */
1315 unsigned int s_li_wait_mult;
Johann Lombardic5e06d12011-05-24 18:31:25 -04001316
1317 /* Kernel thread for multiple mount protection */
1318 struct task_struct *s_mmp_tsk;
Tao Ma3d56b8d2011-07-11 00:03:38 -04001319
1320 /* record the last minlen when FITRIM is called. */
1321 atomic_t s_last_trim_minblks;
Darrick J. Wong04419842012-04-29 18:27:10 -04001322
1323 /* Reference to checksum algorithm driver via cryptoapi */
1324 struct crypto_shash *s_chksum_driver;
Darrick J. Wonga9c473172012-04-29 18:29:10 -04001325
1326 /* Precomputed FS UUID checksum for seeding other checksums */
1327 __u32 s_csum_seed;
Zheng Liu74cd15c2013-02-18 00:32:55 -05001328
1329 /* Reclaim extents from extent status tree */
1330 struct shrinker s_es_shrinker;
1331 struct list_head s_es_lru;
Zheng Liud3922a72013-07-01 08:12:37 -04001332 unsigned long s_es_last_sorted;
Theodore Ts'o1ac64662013-03-02 10:27:46 -05001333 struct percpu_counter s_extent_cache_cnt;
T Makphaibulchoke9c191f72014-03-18 19:24:49 -04001334 struct mb_cache *s_mb_cache;
Zheng Liu74cd15c2013-02-18 00:32:55 -05001335 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp;
Theodore Ts'oefbed4d2013-10-17 21:11:01 -04001336
1337 /* Ratelimit ext4 messages. */
1338 struct ratelimit_state s_err_ratelimit_state;
1339 struct ratelimit_state s_warning_ratelimit_state;
1340 struct ratelimit_state s_msg_ratelimit_state;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001341};
1342
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001343static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001344{
1345 return sb->s_fs_info;
1346}
Mingming Cao617ba132006-10-11 01:20:53 -07001347static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001348{
Mingming Cao617ba132006-10-11 01:20:53 -07001349 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001350}
1351
Kalpak Shahef7f3832007-07-18 09:15:20 -04001352static inline struct timespec ext4_current_time(struct inode *inode)
1353{
1354 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1355 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1356}
1357
Mingming Cao617ba132006-10-11 01:20:53 -07001358static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001359{
Mingming Cao617ba132006-10-11 01:20:53 -07001360 return ino == EXT4_ROOT_INO ||
Aditya Kali7c319d32012-07-22 20:21:31 -04001361 ino == EXT4_USR_QUOTA_INO ||
1362 ino == EXT4_GRP_QUOTA_INO ||
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -04001363 ino == EXT4_BOOT_LOADER_INO ||
Mingming Cao617ba132006-10-11 01:20:53 -07001364 ino == EXT4_JOURNAL_INO ||
1365 ino == EXT4_RESIZE_INO ||
1366 (ino >= EXT4_FIRST_INO(sb) &&
1367 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001368}
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001369
Tao Ma0edeb712011-10-31 17:30:44 -04001370static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1371 struct ext4_io_end *io_end)
1372{
1373 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1374 io_end->flag |= EXT4_IO_END_UNWRITTEN;
Dmitry Monakhove27f41e2012-09-28 23:24:52 -04001375 atomic_inc(&EXT4_I(inode)->i_unwritten);
Tao Ma0edeb712011-10-31 17:30:44 -04001376 }
1377}
1378
Dmitry Monakhovf45ee3a2012-09-28 23:21:09 -04001379static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1380{
1381 return inode->i_private;
1382}
1383
1384static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1385{
1386 inode->i_private = io;
1387}
1388
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001389/*
1390 * Inode dynamic state flags
1391 */
1392enum {
1393 EXT4_STATE_JDATA, /* journaled data exists */
1394 EXT4_STATE_NEW, /* inode is newly created */
1395 EXT4_STATE_XATTR, /* has in-inode xattrs */
1396 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1397 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1398 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1399 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
Frank Mayhar14ece102010-05-17 08:00:00 -04001400 EXT4_STATE_NEWENTRY, /* File just added to dir */
Theodore Ts'of2321092011-01-10 12:12:36 -05001401 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
Dmitry Monakhov17335dc2012-09-29 00:41:21 -04001402 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1403 nolocking */
Tao Ma67cf5b02012-12-10 14:04:46 -05001404 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
Theodore Ts'o74d553a2013-04-03 12:39:17 -04001405 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
Theodore Ts'o7869a4a2013-08-16 22:05:14 -04001406 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001407};
1408
Theodore Ts'o353eb832011-01-10 12:18:25 -05001409#define EXT4_INODE_BIT_FNS(name, field, offset) \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001410static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1411{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001412 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001413} \
1414static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1415{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001416 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001417} \
1418static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1419{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001420 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001421}
1422
Andreas Dilger3f61c0c2013-11-11 22:40:40 -05001423/* Add these declarations here only so that these functions can be
1424 * found by name. Otherwise, they are very hard to locate. */
1425static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1426static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1427static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
Theodore Ts'o353eb832011-01-10 12:18:25 -05001428EXT4_INODE_BIT_FNS(flag, flags, 0)
Andreas Dilger3f61c0c2013-11-11 22:40:40 -05001429
1430/* Add these declarations here only so that these functions can be
1431 * found by name. Otherwise, they are very hard to locate. */
1432static inline int ext4_test_inode_state(struct inode *inode, int bit);
1433static inline void ext4_set_inode_state(struct inode *inode, int bit);
1434static inline void ext4_clear_inode_state(struct inode *inode, int bit);
Theodore Ts'o353eb832011-01-10 12:18:25 -05001435#if (BITS_PER_LONG < 64)
1436EXT4_INODE_BIT_FNS(state, state_flags, 0)
1437
1438static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1439{
1440 (ei)->i_state_flags = 0;
1441}
1442#else
1443EXT4_INODE_BIT_FNS(state, flags, 32)
1444
1445static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1446{
1447 /* We depend on the fact that callers will set i_flags */
1448}
1449#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001450#else
Mingming Cao617ba132006-10-11 01:20:53 -07001451/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001452 * a kernel struct super_block. This will allow us to call the feature-test
1453 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -07001454#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001455#endif
1456
Mingming Cao617ba132006-10-11 01:20:53 -07001457#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001458
1459/*
1460 * Codes for operating systems
1461 */
Mingming Cao617ba132006-10-11 01:20:53 -07001462#define EXT4_OS_LINUX 0
1463#define EXT4_OS_HURD 1
1464#define EXT4_OS_MASIX 2
1465#define EXT4_OS_FREEBSD 3
1466#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001467
1468/*
1469 * Revision levels
1470 */
Mingming Cao617ba132006-10-11 01:20:53 -07001471#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1472#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001473
Mingming Cao617ba132006-10-11 01:20:53 -07001474#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1475#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001476
Mingming Cao617ba132006-10-11 01:20:53 -07001477#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001478
1479/*
1480 * Feature set definitions
1481 */
1482
Mingming Cao617ba132006-10-11 01:20:53 -07001483#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001484 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001485#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001486 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001487#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001488 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001489#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1490 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1491#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1492 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1493#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1494 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1495#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1496 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1497#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1498 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1499#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1500 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001501
Mingming Cao617ba132006-10-11 01:20:53 -07001502#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1503#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1504#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1505#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1506#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1507#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001508
Mingming Cao617ba132006-10-11 01:20:53 -07001509#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1510#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1511#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001512#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
Andreas Dilger717d50e2007-10-16 18:38:25 -04001513#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001514#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -04001515#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Aditya Kaliae812302011-05-24 19:00:39 -04001516#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
Theodore Ts'o281b5992011-09-09 18:34:51 -04001517#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
Darrick J. Wonge6153912012-04-29 18:23:10 -04001518/*
1519 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1520 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1521 * all other data structures' checksums. However, the METADATA_CSUM and
1522 * GDT_CSUM bits are mutually exclusive.
1523 */
Theodore Ts'o9b90e5e2012-01-04 22:01:53 -05001524#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001525
Mingming Cao617ba132006-10-11 01:20:53 -07001526#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1527#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1528#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1529#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1530#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -07001531#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001532#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001533#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
Jose R. Santosce421582007-10-16 18:38:25 -04001534#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Theodore Ts'of710b4b2010-01-25 03:31:32 -05001535#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1536#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
Theodore Ts'o856cbcf2012-02-20 17:53:01 -05001537#define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
Theodore Ts'o9b90e5e2012-01-04 22:01:53 -05001538#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
Tao Ma67cf5b02012-12-10 14:04:46 -05001539#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001540
Theodore Ts'o2035e772011-04-18 17:29:14 -04001541#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1542#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1543 EXT4_FEATURE_INCOMPAT_META_BG)
1544#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1545 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1546 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1547
1548#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1549#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1550 EXT4_FEATURE_INCOMPAT_RECOVER| \
1551 EXT4_FEATURE_INCOMPAT_META_BG)
1552#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1553 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1554 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1555
Mingming Cao617ba132006-10-11 01:20:53 -07001556#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1557#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1558 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -07001559 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001560 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -04001561 EXT4_FEATURE_INCOMPAT_64BIT| \
Johann Lombardic5e06d12011-05-24 18:31:25 -04001562 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
Tao Maf08225d2012-12-10 14:06:03 -05001563 EXT4_FEATURE_INCOMPAT_MMP | \
1564 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
Mingming Cao617ba132006-10-11 01:20:53 -07001565#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1566 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -04001567 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001568 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -04001569 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001570 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
Theodore Ts'o6f16b602011-09-09 19:06:51 -04001571 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
Darrick J. Wonge93376c2012-05-27 08:12:42 -04001572 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
Aditya Kali7c319d32012-07-22 20:21:31 -04001573 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1574 EXT4_FEATURE_RO_COMPAT_QUOTA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001575
1576/*
1577 * Default values for user and/or group using reserved blocks
1578 */
Mingming Cao617ba132006-10-11 01:20:53 -07001579#define EXT4_DEF_RESUID 0
1580#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001581
Theodore Ts'o240799c2008-10-09 23:53:47 -04001582#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1583
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001584/*
1585 * Default mount options
1586 */
Mingming Cao617ba132006-10-11 01:20:53 -07001587#define EXT4_DEFM_DEBUG 0x0001
1588#define EXT4_DEFM_BSDGROUPS 0x0002
1589#define EXT4_DEFM_XATTR_USER 0x0004
1590#define EXT4_DEFM_ACL 0x0008
1591#define EXT4_DEFM_UID16 0x0010
1592#define EXT4_DEFM_JMODE 0x0060
1593#define EXT4_DEFM_JMODE_DATA 0x0020
1594#define EXT4_DEFM_JMODE_ORDERED 0x0040
1595#define EXT4_DEFM_JMODE_WBACK 0x0060
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001596#define EXT4_DEFM_NOBARRIER 0x0100
1597#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1598#define EXT4_DEFM_DISCARD 0x0400
1599#define EXT4_DEFM_NODELALLOC 0x0800
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001600
1601/*
Theodore Ts'o30773842009-01-03 20:27:38 -05001602 * Default journal batch times
1603 */
1604#define EXT4_DEF_MIN_BATCH_TIME 0
1605#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1606
1607/*
Theodore Ts'oa4912122009-03-12 12:18:34 -04001608 * Minimum number of groups in a flexgroup before we separate out
1609 * directories into the first block group of a flexgroup
1610 */
1611#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1612
1613/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001614 * Structure of a directory entry
1615 */
Mingming Cao617ba132006-10-11 01:20:53 -07001616#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001617
Mingming Cao617ba132006-10-11 01:20:53 -07001618struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001619 __le32 inode; /* Inode number */
1620 __le16 rec_len; /* Directory entry length */
1621 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -07001622 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001623};
1624
1625/*
Mingming Cao617ba132006-10-11 01:20:53 -07001626 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001627 * stored in intel byte order, and the name_len field could never be
1628 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1629 * file_type field.
1630 */
Mingming Cao617ba132006-10-11 01:20:53 -07001631struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001632 __le32 inode; /* Inode number */
1633 __le16 rec_len; /* Directory entry length */
1634 __u8 name_len; /* Name length */
1635 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -07001636 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001637};
1638
1639/*
Darrick J. Wonge6153912012-04-29 18:23:10 -04001640 * This is a bogus directory entry at the end of each leaf block that
1641 * records checksums.
1642 */
1643struct ext4_dir_entry_tail {
1644 __le32 det_reserved_zero1; /* Pretend to be unused */
1645 __le16 det_rec_len; /* 12 */
1646 __u8 det_reserved_zero2; /* Zero name length */
1647 __u8 det_reserved_ft; /* 0xDE, fake file type */
1648 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1649};
1650
Tao Ma3c47d542012-12-10 14:05:59 -05001651#define EXT4_DIRENT_TAIL(block, blocksize) \
1652 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1653 ((blocksize) - \
1654 sizeof(struct ext4_dir_entry_tail))))
1655
Darrick J. Wonge6153912012-04-29 18:23:10 -04001656/*
Mingming Cao617ba132006-10-11 01:20:53 -07001657 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001658 * other bits are reserved for now.
1659 */
Mingming Cao617ba132006-10-11 01:20:53 -07001660#define EXT4_FT_UNKNOWN 0
1661#define EXT4_FT_REG_FILE 1
1662#define EXT4_FT_DIR 2
1663#define EXT4_FT_CHRDEV 3
1664#define EXT4_FT_BLKDEV 4
1665#define EXT4_FT_FIFO 5
1666#define EXT4_FT_SOCK 6
1667#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001668
Mingming Cao617ba132006-10-11 01:20:53 -07001669#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001670
Darrick J. Wonge6153912012-04-29 18:23:10 -04001671#define EXT4_FT_DIR_CSUM 0xDE
1672
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001673/*
Mingming Cao617ba132006-10-11 01:20:53 -07001674 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001675 *
1676 * NOTE: It must be a multiple of 4
1677 */
Mingming Cao617ba132006-10-11 01:20:53 -07001678#define EXT4_DIR_PAD 4
1679#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1680#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1681 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -05001682#define EXT4_MAX_REC_LEN ((1<<16)-1)
1683
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001684/*
Eric Sandeen0cfc9252010-08-05 01:46:37 -04001685 * If we ever get support for fs block sizes > page_size, we'll need
1686 * to remove the #if statements in the next two functions...
1687 */
1688static inline unsigned int
1689ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1690{
1691 unsigned len = le16_to_cpu(dlen);
1692
1693#if (PAGE_CACHE_SIZE >= 65536)
1694 if (len == EXT4_MAX_REC_LEN || len == 0)
1695 return blocksize;
1696 return (len & 65532) | ((len & 3) << 16);
1697#else
1698 return len;
1699#endif
1700}
1701
1702static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1703{
1704 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1705 BUG();
1706#if (PAGE_CACHE_SIZE >= 65536)
1707 if (len < 65536)
1708 return cpu_to_le16(len);
1709 if (len == blocksize) {
1710 if (blocksize == 65536)
1711 return cpu_to_le16(EXT4_MAX_REC_LEN);
1712 else
1713 return cpu_to_le16(0);
1714 }
1715 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1716#else
1717 return cpu_to_le16(len);
1718#endif
1719}
1720
1721/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001722 * Hash Tree Directory indexing
1723 * (c) Daniel Phillips, 2001
1724 */
1725
Eric Sandeen4074fe32007-10-16 18:38:25 -04001726#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1727 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001728 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
Mingming Cao617ba132006-10-11 01:20:53 -07001729#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1730#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001731
1732/* Legal values for the dx_root hash_version field: */
1733
1734#define DX_HASH_LEGACY 0
1735#define DX_HASH_HALF_MD4 1
1736#define DX_HASH_TEA 2
Theodore Ts'of99b2582008-10-28 13:21:44 -04001737#define DX_HASH_LEGACY_UNSIGNED 3
1738#define DX_HASH_HALF_MD4_UNSIGNED 4
1739#define DX_HASH_TEA_UNSIGNED 5
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001740
Darrick J. Wong04419842012-04-29 18:27:10 -04001741static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1742 const void *address, unsigned int length)
1743{
1744 struct {
1745 struct shash_desc shash;
Theodore Ts'o3108b542012-07-22 20:25:31 -04001746 char ctx[4];
Darrick J. Wong04419842012-04-29 18:27:10 -04001747 } desc;
1748 int err;
1749
Theodore Ts'o3108b542012-07-22 20:25:31 -04001750 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1751
Darrick J. Wong04419842012-04-29 18:27:10 -04001752 desc.shash.tfm = sbi->s_chksum_driver;
1753 desc.shash.flags = 0;
1754 *(u32 *)desc.ctx = crc;
1755
1756 err = crypto_shash_update(&desc.shash, address, length);
1757 BUG_ON(err);
1758
1759 return *(u32 *)desc.ctx;
1760}
1761
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001762#ifdef __KERNEL__
1763
1764/* hash info structure used by the directory hash */
1765struct dx_hash_info
1766{
1767 u32 hash;
1768 u32 minor_hash;
1769 int hash_version;
1770 u32 *seed;
1771};
1772
Fan Yongd1f52732012-03-18 22:44:40 -04001773
1774/* 32 and 64 bit signed EOF for dx directories */
1775#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1776#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1777
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001778
1779/*
Mingming Cao617ba132006-10-11 01:20:53 -07001780 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001781 */
1782#define HASH_NB_ALWAYS 1
1783
1784
1785/*
1786 * Describe an inode's exact location on disk and in memory
1787 */
Mingming Cao617ba132006-10-11 01:20:53 -07001788struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001789{
1790 struct buffer_head *bh;
1791 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001792 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001793};
1794
Mingming Cao617ba132006-10-11 01:20:53 -07001795static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001796{
Mingming Cao617ba132006-10-11 01:20:53 -07001797 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001798}
1799
1800/*
1801 * This structure is stuffed into the struct file's private_data field
1802 * for directories. It is where we put information so that we can do
1803 * readdir operations in hash tree order.
1804 */
1805struct dir_private_info {
1806 struct rb_root root;
1807 struct rb_node *curr_node;
1808 struct fname *extra_fname;
1809 loff_t last_pos;
1810 __u32 curr_hash;
1811 __u32 curr_minor_hash;
1812 __u32 next_hash;
1813};
1814
1815/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -07001816static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001817ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001818{
Mingming Cao617ba132006-10-11 01:20:53 -07001819 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1820 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001821}
1822
1823/*
1824 * Special error return code only used by dx_probe() and its callers.
1825 */
1826#define ERR_BAD_DX_DIR -75000
1827
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001828/*
Lukas Czernerbfff6872010-10-27 21:30:05 -04001829 * Timeout and state flag for lazy initialization inode thread.
1830 */
1831#define EXT4_DEF_LI_WAIT_MULT 10
1832#define EXT4_DEF_LI_MAX_START_DELAY 5
1833#define EXT4_LAZYINIT_QUIT 0x0001
1834#define EXT4_LAZYINIT_RUNNING 0x0002
1835
1836/*
1837 * Lazy inode table initialization info
1838 */
1839struct ext4_lazy_init {
1840 unsigned long li_state;
Lukas Czernerbfff6872010-10-27 21:30:05 -04001841 struct list_head li_request_list;
1842 struct mutex li_list_mtx;
1843};
1844
1845struct ext4_li_request {
1846 struct super_block *lr_super;
1847 struct ext4_sb_info *lr_sbi;
1848 ext4_group_t lr_next_group;
1849 struct list_head lr_request;
1850 unsigned long lr_next_sched;
1851 unsigned long lr_timeout;
1852};
1853
Lukas Czerner857ac882010-10-27 21:30:05 -04001854struct ext4_features {
1855 struct kobject f_kobj;
1856 struct completion f_kobj_unregister;
1857};
1858
Lukas Czernerbfff6872010-10-27 21:30:05 -04001859/*
Johann Lombardic5e06d12011-05-24 18:31:25 -04001860 * This structure will be used for multiple mount protection. It will be
1861 * written into the block number saved in the s_mmp_block field in the
1862 * superblock. Programs that check MMP should assume that if
1863 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1864 * to use the filesystem, regardless of how old the timestamp is.
1865 */
1866#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1867#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1868#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1869#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1870
1871struct mmp_struct {
1872 __le32 mmp_magic; /* Magic number for MMP */
1873 __le32 mmp_seq; /* Sequence no. updated periodically */
1874
1875 /*
1876 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1877 * purposes and do not affect the correctness of the algorithm
1878 */
1879 __le64 mmp_time; /* Time last updated */
1880 char mmp_nodename[64]; /* Node which last updated MMP block */
1881 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1882
1883 /*
1884 * mmp_check_interval is used to verify if the MMP block has been
1885 * updated on the block device. The value is updated based on the
1886 * maximum time to write the MMP block during an update cycle.
1887 */
1888 __le16 mmp_check_interval;
1889
1890 __le16 mmp_pad1;
Darrick J. Wonge6153912012-04-29 18:23:10 -04001891 __le32 mmp_pad2[226];
1892 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
Johann Lombardic5e06d12011-05-24 18:31:25 -04001893};
1894
1895/* arguments passed to the mmp thread */
1896struct mmpd_data {
1897 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1898 struct super_block *sb; /* super block of the fs */
1899};
1900
1901/*
1902 * Check interval multiplier
1903 * The MMP block is written every update interval and initially checked every
1904 * update interval x the multiplier (the value is then adapted based on the
1905 * write latency). The reason is that writes can be delayed under load and we
1906 * don't want readers to incorrectly assume that the filesystem is no longer
1907 * in use.
1908 */
1909#define EXT4_MMP_CHECK_MULT 2UL
1910
1911/*
1912 * Minimum interval for MMP checking in seconds.
1913 */
1914#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1915
1916/*
1917 * Maximum interval for MMP checking in seconds.
1918 */
1919#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1920
1921/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001922 * Function prototypes
1923 */
1924
1925/*
1926 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -07001927 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001928 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001929# define NORET_TYPE /**/
1930# define ATTRIB_NORET __attribute__((noreturn))
1931# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001932
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001933/* bitmap.c */
Theodore Ts'of6fb99c2012-06-30 19:14:57 -04001934extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
Darrick J. Wong41a246d2012-04-29 18:33:10 -04001935void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1936 struct ext4_group_desc *gdp,
1937 struct buffer_head *bh, int sz);
1938int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1939 struct ext4_group_desc *gdp,
1940 struct buffer_head *bh, int sz);
Darrick J. Wongfa77dcf2012-04-29 18:35:10 -04001941void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1942 struct ext4_group_desc *gdp,
Tao Ma79f1ba42012-10-22 00:34:32 -04001943 struct buffer_head *bh);
Darrick J. Wongfa77dcf2012-04-29 18:35:10 -04001944int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1945 struct ext4_group_desc *gdp,
Tao Ma79f1ba42012-10-22 00:34:32 -04001946 struct buffer_head *bh);
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001947
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001948/* balloc.c */
Lukas Czernerbd862982013-04-03 23:32:34 -04001949extern void ext4_get_group_no_and_offset(struct super_block *sb,
1950 ext4_fsblk_t blocknr,
1951 ext4_group_t *blockgrpp,
1952 ext4_grpblk_t *offsetp);
1953extern ext4_group_t ext4_get_group_number(struct super_block *sb,
1954 ext4_fsblk_t block);
1955
Darrick J. Wongfa77dcf2012-04-29 18:35:10 -04001956extern void ext4_validate_block_bitmap(struct super_block *sb,
1957 struct ext4_group_desc *desc,
Darrick J. Wongdbde0ab2013-08-28 15:59:51 -04001958 ext4_group_t block_group,
Darrick J. Wongfa77dcf2012-04-29 18:35:10 -04001959 struct buffer_head *bh);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001960extern unsigned int ext4_block_group(struct super_block *sb,
1961 ext4_fsblk_t blocknr);
1962extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1963 ext4_fsblk_t blocknr);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001964extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1965extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1966 ext4_group_t group);
Aneesh Kumar K.V7061eba2008-07-11 19:27:31 -04001967extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
Allison Henderson55f020d2011-05-25 07:41:26 -04001968 ext4_fsblk_t goal,
1969 unsigned int flags,
1970 unsigned long *count,
1971 int *errp);
Theodore Ts'oe7d5f312011-09-09 19:14:51 -04001972extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1973 s64 nclusters, unsigned int flags);
Theodore Ts'o5dee5432011-09-09 19:10:51 -04001974extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001975extern void ext4_check_blocks_bitmap(struct super_block *);
Mingming Cao617ba132006-10-11 01:20:53 -07001976extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001977 ext4_group_t block_group,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001978 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -07001979extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
Theodore Ts'o813e5722012-02-20 17:52:46 -05001980
1981extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1982 ext4_group_t block_group);
1983extern int ext4_wait_block_bitmap(struct super_block *sb,
1984 ext4_group_t block_group,
1985 struct buffer_head *bh);
1986extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1987 ext4_group_t block_group);
Theodore Ts'ofd034a82011-09-09 18:42:51 -04001988extern void ext4_init_block_bitmap(struct super_block *sb,
1989 struct buffer_head *bh,
1990 ext4_group_t group,
1991 struct ext4_group_desc *desc);
Theodore Ts'ocff1dfd72011-09-09 19:12:51 -04001992extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1993 ext4_group_t block_group,
1994 struct ext4_group_desc *gdp);
Theodore Ts'od5b8f312011-09-09 18:44:51 -04001995extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1996 ext4_group_t block_group,
1997 struct ext4_group_desc *gdp);
Eric Sandeenf86186b2011-06-28 10:01:31 -04001998ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001999
2000/* dir.c */
Theodore Ts'o60fd4da2010-07-27 11:54:40 -04002001extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
Theodore Ts'of7c21172011-01-10 12:10:55 -05002002 struct file *,
Theodore Ts'o60fd4da2010-07-27 11:54:40 -04002003 struct ext4_dir_entry_2 *,
Tao Ma226ba972012-12-10 14:05:58 -05002004 struct buffer_head *, char *, int,
2005 unsigned int);
2006#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
Theodore Ts'of7c21172011-01-10 12:10:55 -05002007 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
Tao Ma226ba972012-12-10 14:05:58 -05002008 (de), (bh), (buf), (size), (offset)))
Mingming Cao617ba132006-10-11 01:20:53 -07002009extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002010 __u32 minor_hash,
Mingming Cao617ba132006-10-11 01:20:53 -07002011 struct ext4_dir_entry_2 *dirent);
2012extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Tao Ma978fef92012-12-10 14:05:58 -05002013extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2014 struct buffer_head *bh,
2015 void *buf, int buf_size,
2016 const char *name, int namelen,
2017 struct ext4_dir_entry_2 **dest_de);
2018void ext4_insert_dentry(struct inode *inode,
2019 struct ext4_dir_entry_2 *de,
2020 int buf_size,
2021 const char *name, int namelen);
2022static inline void ext4_update_dx_flag(struct inode *inode)
2023{
2024 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
2025 EXT4_FEATURE_COMPAT_DIR_INDEX))
2026 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2027}
Tao Ma65d165d2012-12-10 14:05:59 -05002028static unsigned char ext4_filetype_table[] = {
2029 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2030};
2031
2032static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2033{
2034 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
2035 (filetype >= EXT4_FT_MAX))
2036 return DT_UNKNOWN;
2037
2038 return ext4_filetype_table[filetype];
2039}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002040
2041/* fsync.c */
Josef Bacik02c24a82011-07-16 20:44:56 -04002042extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002043
2044/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002045extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002046 dx_hash_info *hinfo);
2047
2048/* ialloc.c */
Theodore Ts'o11395752013-02-09 16:27:09 -05002049extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2050 const struct qstr *qstr, __u32 goal,
2051 uid_t *owner, int handle_type,
2052 unsigned int line_no, int nblocks);
2053
2054#define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2055 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2056 0, 0, 0)
2057#define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2058 type, nblocks) \
2059 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2060 (type), __LINE__, (nblocks))
2061
2062
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002063extern void ext4_free_inode(handle_t *, struct inode *);
2064extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2065extern unsigned long ext4_count_free_inodes(struct super_block *);
2066extern unsigned long ext4_count_dirs(struct super_block *);
2067extern void ext4_check_inodes_bitmap(struct super_block *);
Theodore Ts'o61d08672010-10-27 21:30:15 -04002068extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002069extern int ext4_init_inode_table(struct super_block *sb,
2070 ext4_group_t group, int barrier);
Theodore Ts'o813e5722012-02-20 17:52:46 -05002071extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002072
Alex Tomasc9de5602008-01-29 00:19:52 -05002073/* mballoc.c */
2074extern long ext4_mb_stats;
2075extern long ext4_mb_max_to_scan;
Akira Fujita9d990122012-05-28 14:19:25 -04002076extern int ext4_mb_init(struct super_block *);
Alex Tomasc9de5602008-01-29 00:19:52 -05002077extern int ext4_mb_release(struct super_block *);
2078extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2079 struct ext4_allocation_request *, int *);
2080extern int ext4_mb_reserve_blocks(struct super_block *, int);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04002081extern void ext4_discard_preallocations(struct inode *);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002082extern int __init ext4_init_mballoc(void);
2083extern void ext4_exit_mballoc(void);
Theodore Ts'o44338712009-11-22 07:44:56 -05002084extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'oe6362602009-11-23 07:17:05 -05002085 struct buffer_head *bh, ext4_fsblk_t block,
2086 unsigned long count, int flags);
Theodore Ts'o28623c22012-09-05 01:31:50 -04002087extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2088 ext4_group_t ngroups);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05002089extern int ext4_mb_add_groupinfo(struct super_block *sb,
Frederic Bohe5f21b0e2008-07-11 19:27:31 -04002090 ext4_group_t i, struct ext4_group_desc *desc);
Yongqiang Yangcc7365d2011-07-26 21:46:07 -04002091extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
Amir Goldstein2846e822011-05-09 10:46:41 -04002092 ext4_fsblk_t block, unsigned long count);
Lukas Czerner7360d172010-10-27 21:30:12 -04002093extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2094
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002095/* inode.c */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002096struct buffer_head *ext4_getblk(handle_t *, struct inode *,
2097 ext4_lblk_t, int, int *);
2098struct buffer_head *ext4_bread(handle_t *, struct inode *,
2099 ext4_lblk_t, int, int *);
Tao Maf19d5872012-12-10 14:05:51 -05002100int ext4_get_block_write(struct inode *inode, sector_t iblock,
2101 struct buffer_head *bh_result, int create);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002102int ext4_get_block(struct inode *inode, sector_t iblock,
2103 struct buffer_head *bh_result, int create);
Tao Ma9c3569b2012-12-10 14:05:57 -05002104int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2105 struct buffer_head *bh, int create);
Tao Maf19d5872012-12-10 14:05:51 -05002106int ext4_walk_page_buffers(handle_t *handle,
2107 struct buffer_head *head,
2108 unsigned from,
2109 unsigned to,
2110 int *partial,
2111 int (*fn)(handle_t *handle,
2112 struct buffer_head *bh));
2113int do_journal_get_write_access(handle_t *handle,
2114 struct buffer_head *bh);
Tao Ma9c3569b2012-12-10 14:05:57 -05002115#define FALL_BACK_TO_NONDELALLOC 1
2116#define CONVERT_INLINE_DATA 2
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002117
David Howells1d1fe1e2008-02-07 00:15:37 -08002118extern struct inode *ext4_iget(struct super_block *, unsigned long);
Christoph Hellwiga9185b42010-03-05 09:21:37 +01002119extern int ext4_write_inode(struct inode *, struct writeback_control *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002120extern int ext4_setattr(struct dentry *, struct iattr *);
Mingming Cao3e3398a2008-07-11 19:27:31 -04002121extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2122 struct kstat *stat);
Al Viro0930fcc2010-06-07 13:16:22 -04002123extern void ext4_evict_inode(struct inode *);
2124extern void ext4_clear_inode(struct inode *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002125extern int ext4_sync_inode(handle_t *, struct inode *);
Christoph Hellwigaa385722011-05-27 06:53:02 -04002126extern void ext4_dirty_inode(struct inode *, int);
Mingming Cao617ba132006-10-11 01:20:53 -07002127extern int ext4_change_inode_journal_flag(struct inode *, int);
2128extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
Jan Karaa3612932013-08-16 21:19:41 -04002129extern int ext4_inode_attach_jinode(struct inode *inode);
Duane Griffin91ef4ca2008-07-11 19:27:31 -04002130extern int ext4_can_truncate(struct inode *inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002131extern void ext4_truncate(struct inode *);
Ashish Sangwanaeb28172013-07-01 08:12:38 -04002132extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
Jan Kara487caee2009-08-17 22:17:20 -04002133extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
Mingming Cao617ba132006-10-11 01:20:53 -07002134extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -04002135extern void ext4_get_inode_flags(struct ext4_inode_info *);
Theodore Ts'occd25062009-02-26 01:04:07 -05002136extern int ext4_alloc_da_blocks(struct inode *inode);
Mingming Cao617ba132006-10-11 01:20:53 -07002137extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07002138extern int ext4_writepage_trans_blocks(struct inode *);
Mingming Caof3bd1f32008-08-19 22:16:03 -04002139extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
Lukas Czernerd863dc32013-05-27 23:32:35 -04002140extern int ext4_block_truncate_page(handle_t *handle,
2141 struct address_space *mapping, loff_t from);
Lukas Czernera87dd182013-05-27 23:32:35 -04002142extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2143 loff_t lstart, loff_t lend);
Nick Pigginc2ec1752009-03-31 15:23:21 -07002144extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
Dmitry Monakhova9e7f442009-12-14 15:21:14 +03002145extern qsize_t *ext4_get_reserved_space(struct inode *inode);
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05002146extern void ext4_da_update_reserve_space(struct inode *inode,
2147 int used, int quota_claim);
Amir Goldsteindae1e522011-06-27 19:40:50 -04002148
2149/* indirect.c */
2150extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2151 struct ext4_map_blocks *map, int flags);
2152extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2153 const struct iovec *iov, loff_t offset,
2154 unsigned long nr_segs);
2155extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
Jan Karafa55a0e2013-06-04 12:56:55 -04002156extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
Theodore Ts'o819c4922013-04-03 12:47:17 -04002157extern void ext4_ind_truncate(handle_t *, struct inode *inode);
Theodore Ts'o26a4c0c2013-04-03 12:45:17 -04002158extern int ext4_free_hole_blocks(handle_t *handle, struct inode *inode,
2159 ext4_lblk_t first, ext4_lblk_t stop);
Amir Goldsteinff9893d2011-06-27 16:36:31 -04002160
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002161/* ioctl.c */
Andi Kleen5cdd7b22008-04-29 22:03:54 -04002162extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002163extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002164
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05002165/* migrate.c */
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -04002166extern int ext4_ext_migrate(struct inode *);
Lukas Czerner0d14b092013-04-10 23:32:52 -04002167extern int ext4_ind_migrate(struct inode *inode);
Wei Yongjun3d0518f2009-02-14 23:01:36 -05002168
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002169/* namei.c */
Darrick J. Wongb0336e82012-04-29 18:41:10 -04002170extern int ext4_dirent_csum_verify(struct inode *inode,
2171 struct ext4_dir_entry *dirent);
Mingming Cao617ba132006-10-11 01:20:53 -07002172extern int ext4_orphan_add(handle_t *, struct inode *);
2173extern int ext4_orphan_del(handle_t *, struct inode *);
2174extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002175 __u32 start_minor_hash, __u32 *next_hash);
Tao Ma7335cd32012-12-10 14:05:59 -05002176extern int search_dir(struct buffer_head *bh,
2177 char *search_buf,
2178 int buf_size,
2179 struct inode *dir,
2180 const struct qstr *d_name,
2181 unsigned int offset,
2182 struct ext4_dir_entry_2 **res_dir);
Tao Ma05019a92012-12-10 14:06:00 -05002183extern int ext4_generic_delete_entry(handle_t *handle,
2184 struct inode *dir,
2185 struct ext4_dir_entry_2 *de_del,
2186 struct buffer_head *bh,
2187 void *entry_buf,
2188 int buf_size,
2189 int csum_size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002190
2191/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002192extern int ext4_group_add(struct super_block *sb,
2193 struct ext4_new_group_data *input);
2194extern int ext4_group_extend(struct super_block *sb,
2195 struct ext4_super_block *es,
2196 ext4_fsblk_t n_blocks_count);
Yongqiang Yang19c52462012-01-04 17:09:44 -05002197extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002198
2199/* super.c */
Theodore Ts'o952fc182012-07-09 16:27:05 -04002200extern int ext4_calculate_overhead(struct super_block *sb);
Darrick J. Wonga9c473172012-04-29 18:29:10 -04002201extern int ext4_superblock_csum_verify(struct super_block *sb,
2202 struct ext4_super_block *es);
Theodore Ts'o06db49e2012-10-10 01:06:58 -04002203extern void ext4_superblock_csum_set(struct super_block *sb);
Theodore Ts'o9933fc02011-08-01 08:45:02 -04002204extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2205extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2206extern void ext4_kvfree(void *ptr);
Theodore Ts'o117fff12012-09-05 01:29:50 -04002207extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2208 ext4_group_t ngroup);
Theodore Ts'o722887d2013-02-08 13:00:31 -05002209extern const char *ext4_decode_error(struct super_block *sb, int errno,
2210 char nbuf[16]);
Joe Perchese7c96e82013-07-01 08:12:37 -04002211
Joe Perchesb9075fa2011-10-31 17:11:33 -07002212extern __printf(4, 5)
2213void __ext4_error(struct super_block *, const char *, unsigned int,
2214 const char *, ...);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002215extern __printf(5, 6)
Joe Perchese7c96e82013-07-01 08:12:37 -04002216void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
Joe Perchesb9075fa2011-10-31 17:11:33 -07002217 const char *, ...);
2218extern __printf(5, 6)
Joe Perchese7c96e82013-07-01 08:12:37 -04002219void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
Joe Perchesb9075fa2011-10-31 17:11:33 -07002220 const char *, ...);
Theodore Ts'oc398eda2010-07-27 11:56:40 -04002221extern void __ext4_std_error(struct super_block *, const char *,
2222 unsigned int, int);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002223extern __printf(4, 5)
2224void __ext4_abort(struct super_block *, const char *, unsigned int,
2225 const char *, ...);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002226extern __printf(4, 5)
2227void __ext4_warning(struct super_block *, const char *, unsigned int,
2228 const char *, ...);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002229extern __printf(3, 4)
Joe Perchese7c96e82013-07-01 08:12:37 -04002230void __ext4_msg(struct super_block *, const char *, const char *, ...);
Johann Lombardic5e06d12011-05-24 18:31:25 -04002231extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2232 const char *, unsigned int, const char *);
Joe Perchesb9075fa2011-10-31 17:11:33 -07002233extern __printf(7, 8)
2234void __ext4_grp_locked_error(const char *, unsigned int,
2235 struct super_block *, ext4_group_t,
2236 unsigned long, ext4_fsblk_t,
2237 const char *, ...);
Joe Perchese7c96e82013-07-01 08:12:37 -04002238
2239#ifdef CONFIG_PRINTK
2240
2241#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2242 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2243#define ext4_error_file(file, func, line, block, fmt, ...) \
2244 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2245#define ext4_error(sb, fmt, ...) \
2246 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2247#define ext4_abort(sb, fmt, ...) \
2248 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2249#define ext4_warning(sb, fmt, ...) \
2250 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2251#define ext4_msg(sb, level, fmt, ...) \
2252 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2253#define dump_mmp_msg(sb, mmp, msg) \
2254 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2255#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2256 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2257 fmt, ##__VA_ARGS__)
2258
2259#else
2260
2261#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2262do { \
2263 no_printk(fmt, ##__VA_ARGS__); \
2264 __ext4_error_inode(inode, "", 0, block, " "); \
2265} while (0)
2266#define ext4_error_file(file, func, line, block, fmt, ...) \
2267do { \
2268 no_printk(fmt, ##__VA_ARGS__); \
2269 __ext4_error_file(file, "", 0, block, " "); \
2270} while (0)
2271#define ext4_error(sb, fmt, ...) \
2272do { \
2273 no_printk(fmt, ##__VA_ARGS__); \
2274 __ext4_error(sb, "", 0, " "); \
2275} while (0)
2276#define ext4_abort(sb, fmt, ...) \
2277do { \
2278 no_printk(fmt, ##__VA_ARGS__); \
2279 __ext4_abort(sb, "", 0, " "); \
2280} while (0)
2281#define ext4_warning(sb, fmt, ...) \
2282do { \
2283 no_printk(fmt, ##__VA_ARGS__); \
2284 __ext4_warning(sb, "", 0, " "); \
2285} while (0)
2286#define ext4_msg(sb, level, fmt, ...) \
2287do { \
2288 no_printk(fmt, ##__VA_ARGS__); \
2289 __ext4_msg(sb, "", " "); \
2290} while (0)
2291#define dump_mmp_msg(sb, mmp, msg) \
2292 __dump_mmp_msg(sb, mmp, "", 0, "")
2293#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2294do { \
2295 no_printk(fmt, ##__VA_ARGS__); \
2296 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2297} while (0)
2298
2299#endif
2300
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002301extern void ext4_update_dynamic_rev(struct super_block *sb);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -05002302extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2303 __u32 compat);
2304extern int ext4_update_rocompat_feature(handle_t *handle,
2305 struct super_block *sb, __u32 rocompat);
2306extern int ext4_update_incompat_feature(handle_t *handle,
2307 struct super_block *sb, __u32 incompat);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002308extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2309 struct ext4_group_desc *bg);
2310extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2311 struct ext4_group_desc *bg);
2312extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2313 struct ext4_group_desc *bg);
Theodore Ts'o021b65b2011-09-09 19:08:51 -04002314extern __u32 ext4_free_group_clusters(struct super_block *sb,
2315 struct ext4_group_desc *bg);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05002316extern __u32 ext4_free_inodes_count(struct super_block *sb,
2317 struct ext4_group_desc *bg);
2318extern __u32 ext4_used_dirs_count(struct super_block *sb,
2319 struct ext4_group_desc *bg);
2320extern __u32 ext4_itable_unused_count(struct super_block *sb,
2321 struct ext4_group_desc *bg);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002322extern void ext4_block_bitmap_set(struct super_block *sb,
2323 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2324extern void ext4_inode_bitmap_set(struct super_block *sb,
2325 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2326extern void ext4_inode_table_set(struct super_block *sb,
2327 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Theodore Ts'o021b65b2011-09-09 19:08:51 -04002328extern void ext4_free_group_clusters_set(struct super_block *sb,
2329 struct ext4_group_desc *bg,
2330 __u32 count);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05002331extern void ext4_free_inodes_set(struct super_block *sb,
2332 struct ext4_group_desc *bg, __u32 count);
2333extern void ext4_used_dirs_set(struct super_block *sb,
2334 struct ext4_group_desc *bg, __u32 count);
2335extern void ext4_itable_unused_set(struct super_block *sb,
2336 struct ext4_group_desc *bg, __u32 count);
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002337extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
Theodore Ts'obb23c202009-05-01 19:44:44 -04002338 struct ext4_group_desc *gdp);
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002339extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2340 struct ext4_group_desc *gdp);
Theodore Ts'o7f511862013-01-13 08:41:45 -05002341extern int ext4_register_li_request(struct super_block *sb,
2342 ext4_group_t first_not_zeroed);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002343
Darrick J. Wong41a246d2012-04-29 18:33:10 -04002344static inline int ext4_has_group_desc_csum(struct super_block *sb)
2345{
2346 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2347 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2348 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2349}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002350
2351static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2352{
2353 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04002354 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002355}
2356
2357static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2358{
2359 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002360 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002361}
2362
2363static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2364{
2365 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002366 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002367}
2368
2369static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2370 ext4_fsblk_t blk)
2371{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04002372 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002373 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2374}
2375
2376static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2377 ext4_fsblk_t blk)
2378{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002379 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002380 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2381}
2382
2383static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2384 ext4_fsblk_t blk)
2385{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002386 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002387 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2388}
2389
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002390static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2391{
Theodore Ts'o06a279d2009-01-17 18:41:37 -05002392 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2393 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2394 le32_to_cpu(raw_inode->i_size_lo);
2395 else
2396 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002397}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002398
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002399static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2400{
2401 raw_inode->i_size_lo = cpu_to_le32(i_size);
2402 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2403}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002404
Alex Tomasc9de5602008-01-29 00:19:52 -05002405static inline
2406struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002407 ext4_group_t group)
Alex Tomasc9de5602008-01-29 00:19:52 -05002408{
2409 struct ext4_group_info ***grp_info;
2410 long indexv, indexh;
Theodore Ts'o2f2e09e2013-06-06 11:16:43 -04002411 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
Alex Tomasc9de5602008-01-29 00:19:52 -05002412 grp_info = EXT4_SB(sb)->s_group_info;
2413 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2414 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2415 return grp_info[indexv][indexh];
2416}
2417
Theodore Ts'o8df96752009-05-01 08:50:38 -04002418/*
2419 * Reading s_groups_count requires using smp_rmb() afterwards. See
2420 * the locking protocol documented in the comments of ext4_group_add()
2421 * in resize.c
2422 */
2423static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2424{
2425 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2426
2427 smp_rmb();
2428 return ngroups;
2429}
Alex Tomasc9de5602008-01-29 00:19:52 -05002430
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002431static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2432 ext4_group_t block_group)
2433{
2434 return block_group >> sbi->s_log_groups_per_flex;
2435}
2436
2437static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2438{
2439 return 1 << sbi->s_log_groups_per_flex;
2440}
2441
Mingming Cao617ba132006-10-11 01:20:53 -07002442#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002443do { \
2444 if ((errno)) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -04002445 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002446} while (0)
2447
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002448#ifdef CONFIG_SMP
Theodore Ts'odf55c992011-09-09 19:16:51 -04002449/* Each CPU can accumulate percpu_counter_batch clusters in their local
2450 * counters. So we need to make sure we have free clusters more
Eric Dumazet179f7eb2009-01-06 14:41:04 -08002451 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002452 */
Theodore Ts'odf55c992011-09-09 19:16:51 -04002453#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002454#else
Theodore Ts'odf55c992011-09-09 19:16:51 -04002455#define EXT4_FREECLUSTERS_WATERMARK 0
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002456#endif
2457
Jan Kara90e775b2013-08-17 10:09:31 -04002458/* Update i_disksize. Requires i_mutex to avoid races with truncate */
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04002459static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2460{
Jan Kara90e775b2013-08-17 10:09:31 -04002461 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2462 !mutex_is_locked(&inode->i_mutex));
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04002463 down_write(&EXT4_I(inode)->i_data_sem);
2464 if (newsize > EXT4_I(inode)->i_disksize)
2465 EXT4_I(inode)->i_disksize = newsize;
2466 up_write(&EXT4_I(inode)->i_data_sem);
Jan Kara90e775b2013-08-17 10:09:31 -04002467}
2468
2469/*
2470 * Update i_disksize after writeback has been started. Races with truncate
2471 * are avoided by checking i_size under i_data_sem.
2472 */
2473static inline void ext4_wb_update_i_disksize(struct inode *inode, loff_t newsize)
2474{
2475 loff_t i_size;
2476
2477 down_write(&EXT4_I(inode)->i_data_sem);
2478 i_size = i_size_read(inode);
2479 if (newsize > i_size)
2480 newsize = i_size;
2481 if (newsize > EXT4_I(inode)->i_disksize)
2482 EXT4_I(inode)->i_disksize = newsize;
2483 up_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04002484}
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04002485
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002486struct ext4_group_info {
2487 unsigned long bb_state;
2488 struct rb_root bb_free_root;
Eric Sandeena36b4492009-08-25 22:36:45 -04002489 ext4_grpblk_t bb_first_free; /* first free block */
2490 ext4_grpblk_t bb_free; /* total free blocks */
2491 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
Curt Wohlgemuth8a57d9d2010-05-16 15:00:00 -04002492 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002493 struct list_head bb_prealloc_list;
2494#ifdef DOUBLE_CHECK
2495 void *bb_bitmap;
2496#endif
2497 struct rw_semaphore alloc_sem;
Eric Sandeena36b4492009-08-25 22:36:45 -04002498 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2499 * regions, index is order.
2500 * bb_counters[3] = 5 means
2501 * 5 free 8-block regions. */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002502};
2503
Tao Ma3d56b8d2011-07-11 00:03:38 -04002504#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2505#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
Darrick J. Wong163a2032013-08-28 17:35:51 -04002506#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
Darrick J. Wong87a39382013-08-28 18:32:58 -04002507#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002508
2509#define EXT4_MB_GRP_NEED_INIT(grp) \
2510 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
Darrick J. Wong163a2032013-08-28 17:35:51 -04002511#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2512 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
Darrick J. Wong87a39382013-08-28 18:32:58 -04002513#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2514 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002515
Tao Ma3d56b8d2011-07-11 00:03:38 -04002516#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2517 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2518#define EXT4_MB_GRP_SET_TRIMMED(grp) \
2519 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2520#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2521 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2522
Theodore Ts'o50797482009-09-18 13:34:02 -04002523#define EXT4_MAX_CONTENTION 8
2524#define EXT4_CONTENTION_THRESHOLD 2
2525
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002526static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2527 ext4_group_t group)
2528{
2529 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2530}
2531
Theodore Ts'o50797482009-09-18 13:34:02 -04002532/*
2533 * Returns true if the filesystem is busy enough that attempts to
2534 * access the block group locks has run into contention.
2535 */
2536static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2537{
2538 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2539}
2540
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002541static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2542{
Theodore Ts'o50797482009-09-18 13:34:02 -04002543 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2544 if (spin_trylock(lock))
2545 /*
2546 * We're able to grab the lock right away, so drop the
2547 * lock contention counter.
2548 */
2549 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2550 else {
2551 /*
2552 * The lock is busy, so bump the contention counter,
2553 * and then wait on the spin lock.
2554 */
2555 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2556 EXT4_MAX_CONTENTION);
2557 spin_lock(lock);
2558 }
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002559}
2560
2561static inline void ext4_unlock_group(struct super_block *sb,
2562 ext4_group_t group)
2563{
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002564 spin_unlock(ext4_group_lock_ptr(sb, group));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002565}
2566
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002567/*
Theodore Ts'o1f7d1e72011-06-27 19:16:02 -04002568 * Block validity checking
2569 */
2570#define ext4_check_indirect_blockref(inode, bh) \
2571 ext4_check_blockref(__func__, __LINE__, inode, \
2572 (__le32 *)(bh)->b_data, \
2573 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2574
2575#define ext4_ind_check_inode(inode) \
2576 ext4_check_blockref(__func__, __LINE__, inode, \
2577 EXT4_I(inode)->i_data, \
2578 EXT4_NDIR_BLOCKS)
2579
2580/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002581 * Inodes and files operations
2582 */
2583
2584/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002585extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002586
2587/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002588extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07002589extern const struct file_operations ext4_file_operations;
Toshiyuki Okajimae0d10bf2010-10-27 21:30:06 -04002590extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
Dmitry Monakhovc2785312012-10-05 11:31:55 -04002591extern void ext4_unwritten_wait(struct inode *inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002592
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05002593/* inline.c */
2594extern int ext4_has_inline_data(struct inode *inode);
2595extern int ext4_get_inline_size(struct inode *inode);
2596extern int ext4_get_max_inline_size(struct inode *inode);
2597extern int ext4_find_inline_data_nolock(struct inode *inode);
2598extern void ext4_write_inline_data(struct inode *inode,
2599 struct ext4_iloc *iloc,
2600 void *buffer, loff_t pos,
2601 unsigned int len);
2602extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
2603 unsigned int len);
2604extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2605 unsigned int len);
2606extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2607
2608extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2609extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2610 struct inode *inode,
2611 loff_t pos, unsigned len,
2612 unsigned flags,
2613 struct page **pagep);
2614extern int ext4_write_inline_data_end(struct inode *inode,
2615 loff_t pos, unsigned len,
2616 unsigned copied,
2617 struct page *page);
2618extern struct buffer_head *
2619ext4_journalled_write_inline_data(struct inode *inode,
2620 unsigned len,
2621 struct page *page);
2622extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2623 struct inode *inode,
2624 loff_t pos, unsigned len,
2625 unsigned flags,
2626 struct page **pagep,
2627 void **fsdata);
2628extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2629 unsigned len, unsigned copied,
2630 struct page *page);
2631extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
2632 struct inode *inode);
2633extern int ext4_try_create_inline_dir(handle_t *handle,
2634 struct inode *parent,
2635 struct inode *inode);
2636extern int ext4_read_inline_dir(struct file *filp,
Al Viro725bebb2013-05-17 16:08:53 -04002637 struct dir_context *ctx,
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05002638 int *has_inline_data);
Tao Ma8af0f082013-04-19 17:53:09 -04002639extern int htree_inlinedir_to_tree(struct file *dir_file,
2640 struct inode *dir, ext4_lblk_t block,
2641 struct dx_hash_info *hinfo,
2642 __u32 start_hash, __u32 start_minor_hash,
2643 int *has_inline_data);
Theodore Ts'o95eaefb2013-02-09 15:23:03 -05002644extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2645 const struct qstr *d_name,
2646 struct ext4_dir_entry_2 **res_dir,
2647 int *has_inline_data);
2648extern int ext4_delete_inline_entry(handle_t *handle,
2649 struct inode *dir,
2650 struct ext4_dir_entry_2 *de_del,
2651 struct buffer_head *bh,
2652 int *has_inline_data);
2653extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2654extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2655 struct ext4_dir_entry_2 **parent_de,
2656 int *retval);
2657extern int ext4_inline_data_fiemap(struct inode *inode,
2658 struct fiemap_extent_info *fieinfo,
2659 int *has_inline);
2660extern int ext4_try_to_evict_inline_data(handle_t *handle,
2661 struct inode *inode,
2662 int needed);
2663extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2664
2665extern int ext4_convert_inline_data(struct inode *inode);
2666
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002667/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002668extern const struct inode_operations ext4_dir_inode_operations;
2669extern const struct inode_operations ext4_special_inode_operations;
Theodore Ts'o596397b2009-05-01 13:49:15 -04002670extern struct dentry *ext4_get_parent(struct dentry *child);
Tao Maa774f9c2012-12-10 14:05:57 -05002671extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2672 struct ext4_dir_entry_2 *de,
2673 int blocksize, int csum_size,
2674 unsigned int parent_ino, int dotdot_real_len);
Tao Ma3c47d542012-12-10 14:05:59 -05002675extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2676 unsigned int blocksize);
2677extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2678 struct inode *inode,
2679 struct buffer_head *bh);
Tao Ma8af0f082013-04-19 17:53:09 -04002680#define S_SHIFT 12
2681static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2682 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
2683 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
2684 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
2685 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
2686 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
2687 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
2688 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
2689};
2690
2691static inline void ext4_set_de_type(struct super_block *sb,
2692 struct ext4_dir_entry_2 *de,
2693 umode_t mode) {
2694 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
2695 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2696}
2697
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002698
2699/* symlink.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002700extern const struct inode_operations ext4_symlink_inode_operations;
2701extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002702
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04002703/* block_validity */
2704extern void ext4_release_system_zone(struct super_block *sb);
2705extern int ext4_setup_system_zone(struct super_block *sb);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002706extern int __init ext4_init_system_zone(void);
2707extern void ext4_exit_system_zone(void);
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04002708extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2709 ext4_fsblk_t start_blk,
2710 unsigned int count);
Theodore Ts'o1f7d1e72011-06-27 19:16:02 -04002711extern int ext4_check_blockref(const char *, unsigned int,
2712 struct inode *, __le32 *, unsigned int);
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04002713
Alex Tomasa86c6182006-10-11 01:21:03 -07002714/* extents.c */
Theodore Ts'o4a092d72012-11-28 13:03:30 -05002715struct ext4_ext_path;
2716struct ext4_extent;
2717
Zheng Liud7b2a002013-08-28 14:47:06 -04002718/*
2719 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
2720 * __le32.
2721 */
2722#define EXT_MAX_BLOCKS 0xffffffff
2723
Alex Tomasa86c6182006-10-11 01:21:03 -07002724extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2725extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
Jan Karafffb2732013-06-04 13:01:11 -04002726extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04002727extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2728 struct ext4_map_blocks *map, int flags);
Theodore Ts'o819c4922013-04-03 12:47:17 -04002729extern void ext4_ext_truncate(handle_t *, struct inode *);
Theodore Ts'o26a4c0c2013-04-03 12:45:17 -04002730extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2731 ext4_lblk_t end);
Alex Tomasa86c6182006-10-11 01:21:03 -07002732extern void ext4_ext_init(struct super_block *);
2733extern void ext4_ext_release(struct super_block *);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002734extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
Amit Aroraa2df2a62007-07-17 21:42:41 -04002735 loff_t len);
Jan Kara6b523df2013-06-04 13:21:11 -04002736extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
2737 loff_t offset, ssize_t len);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04002738extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2739 struct ext4_map_blocks *map, int flags);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05002740extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2741 ext4_lblk_t lblocks);
2742extern int ext4_extent_tree_init(handle_t *, struct inode *);
2743extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2744 int num,
2745 struct ext4_ext_path *path);
2746extern int ext4_can_extents_be_merged(struct inode *inode,
2747 struct ext4_extent *ex1,
2748 struct ext4_extent *ex2);
2749extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2750 struct ext4_ext_path *,
2751 struct ext4_extent *, int);
2752extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002753 struct ext4_ext_path *,
2754 int flags);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05002755extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2756extern int ext4_ext_check_inode(struct inode *inode);
Zheng Liuf7fec032013-02-18 00:28:47 -05002757extern int ext4_find_delalloc_range(struct inode *inode,
2758 ext4_lblk_t lblk_start,
2759 ext4_lblk_t lblk_end);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05002760extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05002761extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2762 __u64 start, __u64 len);
Theodore Ts'o7869a4a2013-08-16 22:05:14 -04002763extern int ext4_ext_precache(struct inode *inode);
Namjae Jeon9eb79482014-02-23 15:18:59 -05002764extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
Theodore Ts'o4a092d72012-11-28 13:03:30 -05002765
Akira Fujita748de672009-06-17 19:24:03 -04002766/* move_extent.c */
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -04002767extern void ext4_double_down_write_data_sem(struct inode *first,
2768 struct inode *second);
2769extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2770 struct inode *donor_inode);
Akira Fujita748de672009-06-17 19:24:03 -04002771extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2772 __u64 start_orig, __u64 start_donor,
2773 __u64 len, __u64 *moved_len);
Namjae Jeon9eb79482014-02-23 15:18:59 -05002774extern int mext_next_extent(struct inode *inode, struct ext4_ext_path *path,
2775 struct ext4_extent **extent);
Akira Fujita748de672009-06-17 19:24:03 -04002776
Theodore Ts'obd2d0212010-10-27 21:30:10 -04002777/* page-io.c */
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002778extern int __init ext4_init_pageio(void);
2779extern void ext4_exit_pageio(void);
Theodore Ts'obd2d0212010-10-27 21:30:10 -04002780extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
Jan Kara97a851e2013-06-04 11:58:58 -04002781extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2782extern int ext4_put_io_end(ext4_io_end_t *io_end);
2783extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2784extern void ext4_io_submit_init(struct ext4_io_submit *io,
2785 struct writeback_control *wbc);
Jan Kara2e8fa542013-06-04 14:21:02 -04002786extern void ext4_end_io_rsv_work(struct work_struct *work);
Theodore Ts'obd2d0212010-10-27 21:30:10 -04002787extern void ext4_io_submit(struct ext4_io_submit *io);
2788extern int ext4_bio_write_page(struct ext4_io_submit *io,
2789 struct page *page,
2790 int len,
2791 struct writeback_control *wbc);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05002792
Johann Lombardic5e06d12011-05-24 18:31:25 -04002793/* mmp.c */
2794extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
Darrick J. Wong5c359a42012-04-29 18:47:10 -04002795extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2796extern int ext4_mmp_csum_verify(struct super_block *sb,
2797 struct mmp_struct *mmp);
Johann Lombardic5e06d12011-05-24 18:31:25 -04002798
Jan Kara3613d222013-06-04 13:19:34 -04002799/*
2800 * Note that these flags will never ever appear in a buffer_head's state flag.
2801 * See EXT4_MAP_... to see where this is used.
2802 */
Jiaying Zhang744692d2010-03-04 16:14:02 -05002803enum ext4_state_bits {
2804 BH_Uninit /* blocks are allocated but uninitialized on disk */
Jan Kara3613d222013-06-04 13:19:34 -04002805 = BH_JBDPrivateStart,
Aditya Kali7b415bf2011-09-09 19:04:51 -04002806 BH_AllocFromCluster, /* allocated blocks were part of already
Jan Kara3613d222013-06-04 13:19:34 -04002807 * allocated cluster. */
Jiaying Zhang744692d2010-03-04 16:14:02 -05002808};
2809
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05002810/*
Adam Buchbinder48fc7f72012-09-19 21:48:00 -04002811 * Add new method to test whether block and inode bitmaps are properly
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05002812 * initialized. With uninit_bg reading the block from disk is not enough
2813 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2814 */
2815#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2816
2817static inline int bitmap_uptodate(struct buffer_head *bh)
2818{
2819 return (buffer_uptodate(bh) &&
2820 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2821}
2822static inline void set_bitmap_uptodate(struct buffer_head *bh)
2823{
2824 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2825}
2826
Dmitry Monakhov17335dc2012-09-29 00:41:21 -04002827/*
2828 * Disable DIO read nolock optimization, so new dioreaders will be forced
2829 * to grab i_mutex
2830 */
2831static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2832{
2833 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2834 smp_mb();
2835}
2836static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2837{
2838 smp_mb();
2839 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2840}
2841
Akinobu Mita731eb1a2010-03-03 23:55:01 -05002842#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2843
Eric Sandeene9e3bce2011-02-12 08:17:34 -05002844/* For ioend & aio unwritten conversion wait queues */
2845#define EXT4_WQ_HASH_SZ 37
2846#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2847 EXT4_WQ_HASH_SZ])
2848#define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2849 EXT4_WQ_HASH_SZ])
2850extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2851extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2852
Yongqiang Yang8f82f842011-07-26 21:35:44 -04002853#define EXT4_RESIZING 0
2854extern int ext4_resize_begin(struct super_block *sb);
2855extern void ext4_resize_end(struct super_block *sb);
2856
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002857#endif /* __KERNEL__ */
2858
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002859#endif /* _EXT4_H */