blob: 5b0e26a1272dcc6c6573463767f8563ec683e6e3 [file] [log] [blame]
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002 * ext4.h
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040016#ifndef _EXT4_H
17#define _EXT4_H
Dave Kleikampac27a0e2006-10-11 01:20:50 -070018
19#include <linux/types.h>
Mingming Cao3a5b2ec2006-10-11 01:21:05 -070020#include <linux/blkdev.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070021#include <linux/magic.h>
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -050022#include <linux/jbd2.h>
Mingming Cao60e58e02009-01-22 18:13:05 +010023#include <linux/quota.h>
Theodore Ts'od444c3c2009-05-01 13:44:33 -040024#include <linux/rwsem.h>
25#include <linux/rbtree.h>
26#include <linux/seqlock.h>
27#include <linux/mutex.h>
Theodore Ts'oca0faba2009-05-03 16:33:44 -040028#include <linux/timer.h>
29#include <linux/wait.h>
30#include <linux/blockgroup_lock.h>
31#include <linux/percpu_counter.h>
Ben Hutchings4d92dc02010-05-17 06:00:00 -040032#ifdef __KERNEL__
33#include <linux/compat.h>
34#endif
Alex Tomasc9de5602008-01-29 00:19:52 -050035
Dave Kleikampac27a0e2006-10-11 01:20:50 -070036/*
Shen Feng8a356942008-07-11 19:27:31 -040037 * The fourth extended filesystem constants/structures
Dave Kleikampac27a0e2006-10-11 01:20:50 -070038 */
39
40/*
Mingming Cao617ba132006-10-11 01:20:53 -070041 * Define EXT4FS_DEBUG to produce debug messages
Dave Kleikampac27a0e2006-10-11 01:20:50 -070042 */
Mingming Cao617ba132006-10-11 01:20:53 -070043#undef EXT4FS_DEBUG
Dave Kleikampac27a0e2006-10-11 01:20:50 -070044
45/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -070046 * Debug code
47 */
Mingming Cao617ba132006-10-11 01:20:53 -070048#ifdef EXT4FS_DEBUG
49#define ext4_debug(f, a...) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070050 do { \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040051 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -040052 __FILE__, __LINE__, __func__); \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040053 printk(KERN_DEBUG f, ## a); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070054 } while (0)
55#else
Mingming Cao617ba132006-10-11 01:20:53 -070056#define ext4_debug(f, a...) do {} while (0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070057#endif
58
Frank Mayhar273df552010-03-02 11:46:09 -050059#define EXT4_ERROR_INODE(inode, fmt, a...) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -040060 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
61
62#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
63 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
Frank Mayhar273df552010-03-02 11:46:09 -050064
Theodore Ts'of7c21172011-01-10 12:10:55 -050065#define EXT4_ERROR_FILE(file, block, fmt, a...) \
66 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
Frank Mayhar273df552010-03-02 11:46:09 -050067
Theodore Ts'od444c3c2009-05-01 13:44:33 -040068/* data type for block offset of block group */
69typedef int ext4_grpblk_t;
70
71/* data type for filesystem-wide blocks number */
72typedef unsigned long long ext4_fsblk_t;
73
74/* data type for file logical block number */
75typedef __u32 ext4_lblk_t;
76
77/* data type for block group number */
78typedef unsigned int ext4_group_t;
79
Theodore Ts'o296c3552009-09-30 00:32:42 -040080/*
Theodore Ts'o60e66792010-05-17 07:00:00 -040081 * Flags used in mballoc's allocation_context flags field.
Theodore Ts'o296c3552009-09-30 00:32:42 -040082 *
83 * Also used to show what's going on for debugging purposes when the
84 * flag field is exported via the traceport interface
85 */
Theodore Ts'od444c3c2009-05-01 13:44:33 -040086
Alex Tomasc9de5602008-01-29 00:19:52 -050087/* prefer goal again. length */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040088#define EXT4_MB_HINT_MERGE 0x0001
Alex Tomasc9de5602008-01-29 00:19:52 -050089/* blocks already reserved */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040090#define EXT4_MB_HINT_RESERVED 0x0002
Alex Tomasc9de5602008-01-29 00:19:52 -050091/* metadata is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040092#define EXT4_MB_HINT_METADATA 0x0004
Alex Tomasc9de5602008-01-29 00:19:52 -050093/* first blocks in the file */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040094#define EXT4_MB_HINT_FIRST 0x0008
Alex Tomasc9de5602008-01-29 00:19:52 -050095/* search for the best chunk */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040096#define EXT4_MB_HINT_BEST 0x0010
Alex Tomasc9de5602008-01-29 00:19:52 -050097/* data is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040098#define EXT4_MB_HINT_DATA 0x0020
Alex Tomasc9de5602008-01-29 00:19:52 -050099/* don't preallocate (for tails) */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400100#define EXT4_MB_HINT_NOPREALLOC 0x0040
Alex Tomasc9de5602008-01-29 00:19:52 -0500101/* allocate for locality group */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400102#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
Alex Tomasc9de5602008-01-29 00:19:52 -0500103/* allocate goal blocks or none */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400104#define EXT4_MB_HINT_GOAL_ONLY 0x0100
Alex Tomasc9de5602008-01-29 00:19:52 -0500105/* goal is meaningful */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400106#define EXT4_MB_HINT_TRY_GOAL 0x0200
Mingming Caod2a17632008-07-14 17:52:37 -0400107/* blocks already pre-reserved by delayed allocation */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400108#define EXT4_MB_DELALLOC_RESERVED 0x0400
Theodore Ts'o4ba74d02009-08-09 22:01:13 -0400109/* We are doing stream allocation */
110#define EXT4_MB_STREAM_ALLOC 0x0800
Allison Henderson55f020d2011-05-25 07:41:26 -0400111/* Use reserved root blocks if needed */
112#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
Alex Tomasc9de5602008-01-29 00:19:52 -0500113
114struct ext4_allocation_request {
115 /* target inode for block we're allocating */
116 struct inode *inode;
Alex Tomasc9de5602008-01-29 00:19:52 -0500117 /* how many blocks we want to allocate */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500118 unsigned int len;
Eric Sandeen726447d2009-07-13 10:24:17 -0400119 /* logical block in target inode */
120 ext4_lblk_t logical;
121 /* the closest logical allocated block to the left */
122 ext4_lblk_t lleft;
123 /* the closest logical allocated block to the right */
124 ext4_lblk_t lright;
125 /* phys. target (a hint) */
126 ext4_fsblk_t goal;
127 /* phys. block for the closest logical allocated block to the left */
128 ext4_fsblk_t pleft;
129 /* phys. block for the closest logical allocated block to the right */
130 ext4_fsblk_t pright;
Alex Tomasc9de5602008-01-29 00:19:52 -0500131 /* flags. see above EXT4_MB_HINT_* */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500132 unsigned int flags;
Alex Tomasc9de5602008-01-29 00:19:52 -0500133};
134
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700135/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400136 * Logical to physical block mapping, used by ext4_map_blocks()
137 *
138 * This structure is used to pass requests into ext4_map_blocks() as
139 * well as to store the information returned by ext4_map_blocks(). It
140 * takes less room on the stack than a struct buffer_head.
141 */
142#define EXT4_MAP_NEW (1 << BH_New)
143#define EXT4_MAP_MAPPED (1 << BH_Mapped)
144#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
145#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
146#define EXT4_MAP_UNINIT (1 << BH_Uninit)
Aditya Kali7b415bf2011-09-09 19:04:51 -0400147/* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
148 * ext4_map_blocks wants to know whether or not the underlying cluster has
149 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
150 * the requested mapping was from previously mapped (or delayed allocated)
151 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
152 * should never appear on buffer_head's state flags.
153 */
154#define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400155#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
156 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
Aditya Kali7b415bf2011-09-09 19:04:51 -0400157 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400158
159struct ext4_map_blocks {
160 ext4_fsblk_t m_pblk;
161 ext4_lblk_t m_lblk;
162 unsigned int m_len;
163 unsigned int m_flags;
164};
165
166/*
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400167 * For delayed allocation tracking
168 */
169struct mpage_da_data {
170 struct inode *inode;
171 sector_t b_blocknr; /* start block number of extent */
172 size_t b_size; /* size of extent */
173 unsigned long b_state; /* state of the extent */
174 unsigned long first_page, next_page; /* extent of pages */
175 struct writeback_control *wbc;
176 int io_done;
177 int pages_written;
178 int retval;
179};
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400180
181/*
182 * Flags for ext4_io_end->flags
183 */
184#define EXT4_IO_END_UNWRITTEN 0x0001
185#define EXT4_IO_END_ERROR 0x0002
Jiaying Zhang8c0bec22011-08-31 11:50:51 -0400186#define EXT4_IO_END_QUEUED 0x0004
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400187
188struct ext4_io_page {
189 struct page *p_page;
Theodore Ts'o83668e72010-11-08 13:45:33 -0500190 atomic_t p_count;
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400191};
192
193#define MAX_IO_PAGES 128
194
Mingming Cao00314622009-09-28 15:49:08 -0400195typedef struct ext4_io_end {
jiayingz@google.com (Jiaying Zhang)5b3ff232010-07-27 11:56:06 -0400196 struct list_head list; /* per-file finished IO list */
Mingming Cao00314622009-09-28 15:49:08 -0400197 struct inode *inode; /* file being written to */
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400198 unsigned int flag; /* unwritten or not */
Jiaying Zhang744692d2010-03-04 16:14:02 -0500199 struct page *page; /* page struct for buffer write */
Eric Sandeena1de02d2010-02-04 23:58:38 -0500200 loff_t offset; /* offset in the file */
201 ssize_t size; /* size of the extent */
Mingming Cao00314622009-09-28 15:49:08 -0400202 struct work_struct work; /* data work queue */
jiayingz@google.com (Jiaying Zhang)5b3ff232010-07-27 11:56:06 -0400203 struct kiocb *iocb; /* iocb struct for AIO */
204 int result; /* error value for AIO */
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400205 int num_io_pages;
206 struct ext4_io_page *pages[MAX_IO_PAGES];
Mingming Cao00314622009-09-28 15:49:08 -0400207} ext4_io_end_t;
208
Theodore Ts'obd2d0212010-10-27 21:30:10 -0400209struct ext4_io_submit {
210 int io_op;
211 struct bio *io_bio;
212 ext4_io_end_t *io_end;
213 struct ext4_io_page *io_page;
214 sector_t io_next_block;
215};
216
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400217/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700218 * Special inodes numbers
219 */
Mingming Cao617ba132006-10-11 01:20:53 -0700220#define EXT4_BAD_INO 1 /* Bad blocks inode */
221#define EXT4_ROOT_INO 2 /* Root inode */
Aditya Kaliae812302011-05-24 19:00:39 -0400222#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
223#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
Mingming Cao617ba132006-10-11 01:20:53 -0700224#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
225#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
226#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
227#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700228
Mingming Cao617ba132006-10-11 01:20:53 -0700229/* First non-reserved inode for old ext4 filesystems */
230#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700231
232/*
233 * Maximal count of links to a file
234 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400235#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700236
237/*
238 * Macro-instructions used to manage several block sizes
239 */
Mingming Cao617ba132006-10-11 01:20:53 -0700240#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -0500241#define EXT4_MAX_BLOCK_SIZE 65536
242#define EXT4_MIN_BLOCK_LOG_SIZE 10
Curt Wohlgemuthfb1813f2010-10-27 21:29:12 -0400243#define EXT4_MAX_BLOCK_LOG_SIZE 16
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700244#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700245# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700246#else
Mingming Cao617ba132006-10-11 01:20:53 -0700247# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700248#endif
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400249#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
Theodore Ts'o281b5992011-09-09 18:34:51 -0400250#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
251 EXT4_SB(s)->s_cluster_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700252#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700253# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Theodore Ts'o281b5992011-09-09 18:34:51 -0400254# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700255#else
Mingming Cao617ba132006-10-11 01:20:53 -0700256# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700257#endif
258#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700259#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
260#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
261#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700262#else
Mingming Cao617ba132006-10-11 01:20:53 -0700263#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
264 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700265 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -0700266#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
267 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700268 (s)->s_first_ino)
269#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400270#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700271
Theodore Ts'od5b8f312011-09-09 18:44:51 -0400272/* Translate a block number to a cluster number */
273#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
274/* Translate a cluster number to a block number */
275#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
276/* Translate # of blks to # of clusters */
277#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
278 (sbi)->s_cluster_bits)
279
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700280/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700281 * Structure of a blocks group descriptor
282 */
Mingming Cao617ba132006-10-11 01:20:53 -0700283struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700284{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400285 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400286 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
287 __le32 bg_inode_table_lo; /* Inodes table block */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500288 __le16 bg_free_blocks_count_lo;/* Free blocks count */
289 __le16 bg_free_inodes_count_lo;/* Free inodes count */
290 __le16 bg_used_dirs_count_lo; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400291 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
292 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500293 __le16 bg_itable_unused_lo; /* Unused inodes count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400294 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700295 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
296 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
297 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500298 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
299 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
300 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500301 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500302 __u32 bg_reserved2[3];
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700303};
304
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400305/*
306 * Structure of a flex block group info
307 */
308
309struct flex_groups {
Theodore Ts'o9f24e422009-03-04 19:09:10 -0500310 atomic_t free_inodes;
Theodore Ts'o24aaa8e2011-09-09 18:58:51 -0400311 atomic_t free_clusters;
Theodore Ts'o7d39db12009-03-04 19:31:53 -0500312 atomic_t used_dirs;
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400313};
314
Andreas Dilger717d50e2007-10-16 18:38:25 -0400315#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
316#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
317#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
318
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700319/*
320 * Macro-instructions used to manage group descriptors
321 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700322#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700323#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700324#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
325#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700326#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700327# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
Theodore Ts'o281b5992011-09-09 18:34:51 -0400328# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
Mingming Cao617ba132006-10-11 01:20:53 -0700329# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
330# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
331# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700332#else
Mingming Cao617ba132006-10-11 01:20:53 -0700333# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700334# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700335# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700336#endif
337
338/*
339 * Constants relative to the data blocks
340 */
Mingming Cao617ba132006-10-11 01:20:53 -0700341#define EXT4_NDIR_BLOCKS 12
342#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
343#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
344#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
345#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700346
347/*
348 * Inode flags
349 */
Mingming Cao617ba132006-10-11 01:20:53 -0700350#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
351#define EXT4_UNRM_FL 0x00000002 /* Undelete */
352#define EXT4_COMPR_FL 0x00000004 /* Compress file */
353#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
354#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
355#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
356#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
357#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700358/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700359#define EXT4_DIRTY_FL 0x00000100
360#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
361#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
362#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700363/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700364#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
365#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
366#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
367#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
368#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
369#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500370#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
Alex Tomasa86c6182006-10-11 01:21:03 -0700371#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Theodore Ts'of710b4b2010-01-25 03:31:32 -0500372#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500373#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500374#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700375
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500376#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
377#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700378
Duane Griffin8fa43a82009-02-15 18:57:26 -0500379/* Flags that should be inherited by new inodes from their parent. */
380#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
Theodore Ts'o1cd9f092011-08-31 11:54:51 -0400381 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
Duane Griffin8fa43a82009-02-15 18:57:26 -0500382 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
383 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
384
Duane Griffin2dc6b0d2009-02-15 18:09:20 -0500385/* Flags that are appropriate for regular files (all but dir-specific ones). */
386#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
387
388/* Flags that are appropriate for non-directories/regular files. */
389#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
390
391/* Mask out flags that are inappropriate for the given type of inode. */
392static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
393{
394 if (S_ISDIR(mode))
395 return flags;
396 else if (S_ISREG(mode))
397 return flags & EXT4_REG_FLMASK;
398 else
399 return flags & EXT4_OTHER_FLMASK;
400}
401
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400402/*
403 * Inode flags used for atomic set/get
404 */
405enum {
406 EXT4_INODE_SECRM = 0, /* Secure deletion */
407 EXT4_INODE_UNRM = 1, /* Undelete */
408 EXT4_INODE_COMPR = 2, /* Compress file */
409 EXT4_INODE_SYNC = 3, /* Synchronous updates */
410 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
411 EXT4_INODE_APPEND = 5, /* writes to file may only append */
412 EXT4_INODE_NODUMP = 6, /* do not dump file */
413 EXT4_INODE_NOATIME = 7, /* do not update atime */
414/* Reserved for compression usage... */
415 EXT4_INODE_DIRTY = 8,
416 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
417 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
418 EXT4_INODE_ECOMPR = 11, /* Compression error */
419/* End compression flags --- maybe not all used */
420 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
421 EXT4_INODE_IMAGIC = 13, /* AFS directory */
422 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
423 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
424 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
425 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
426 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
427 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
428 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
429 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
430 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
431};
432
433#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
434#define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
435 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
436 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
437
438/*
439 * Since it's pretty easy to mix up bit numbers and hex values, and we
440 * can't do a compile-time test for ENUM values, we use a run-time
441 * test to make sure that EXT4_XXX_FL is consistent with respect to
442 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
443 * out so it won't cost any extra space in the compiled kernel image.
444 * But it's important that these values are the same, since we are
445 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
446 * must be consistent with the values of FS_XXX_FL defined in
447 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
448 * ext4 filesystems, and of course the values defined in e2fsprogs.
449 *
450 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
451 */
452static inline void ext4_check_flag_values(void)
453{
454 CHECK_FLAG_VALUE(SECRM);
455 CHECK_FLAG_VALUE(UNRM);
456 CHECK_FLAG_VALUE(COMPR);
457 CHECK_FLAG_VALUE(SYNC);
458 CHECK_FLAG_VALUE(IMMUTABLE);
459 CHECK_FLAG_VALUE(APPEND);
460 CHECK_FLAG_VALUE(NODUMP);
461 CHECK_FLAG_VALUE(NOATIME);
462 CHECK_FLAG_VALUE(DIRTY);
463 CHECK_FLAG_VALUE(COMPRBLK);
464 CHECK_FLAG_VALUE(NOCOMPR);
465 CHECK_FLAG_VALUE(ECOMPR);
466 CHECK_FLAG_VALUE(INDEX);
467 CHECK_FLAG_VALUE(IMAGIC);
468 CHECK_FLAG_VALUE(JOURNAL_DATA);
469 CHECK_FLAG_VALUE(NOTAIL);
470 CHECK_FLAG_VALUE(DIRSYNC);
471 CHECK_FLAG_VALUE(TOPDIR);
472 CHECK_FLAG_VALUE(HUGE_FILE);
473 CHECK_FLAG_VALUE(EXTENTS);
474 CHECK_FLAG_VALUE(EA_INODE);
475 CHECK_FLAG_VALUE(EOFBLOCKS);
476 CHECK_FLAG_VALUE(RESERVED);
477}
478
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700479/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700480struct ext4_new_group_input {
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400481 __u32 group; /* Group number for this data */
482 __u64 block_bitmap; /* Absolute block number of block bitmap */
483 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
484 __u64 inode_table; /* Absolute block number of inode table start */
485 __u32 blocks_count; /* Total number of blocks in this group */
486 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700487 __u16 unused;
488};
489
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400490#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
491struct compat_ext4_new_group_input {
492 u32 group;
493 compat_u64 block_bitmap;
494 compat_u64 inode_bitmap;
495 compat_u64 inode_table;
496 u32 blocks_count;
497 u16 reserved_blocks;
498 u16 unused;
499};
500#endif
501
Mingming Cao617ba132006-10-11 01:20:53 -0700502/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
503struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700504 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700505 __u64 block_bitmap;
506 __u64 inode_bitmap;
507 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700508 __u32 blocks_count;
509 __u16 reserved_blocks;
510 __u16 unused;
511 __u32 free_blocks_count;
512};
513
Amit Aroraa2df2a62007-07-17 21:42:41 -0400514/*
Eric Sandeen79e83032010-07-27 11:56:07 -0400515 * Flags used by ext4_map_blocks()
Amit Aroraa2df2a62007-07-17 21:42:41 -0400516 */
Theodore Ts'oc2177052009-05-14 00:58:52 -0400517 /* Allocate any needed blocks and/or convert an unitialized
518 extent to be an initialized ext4 */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400519#define EXT4_GET_BLOCKS_CREATE 0x0001
Theodore Ts'oc2177052009-05-14 00:58:52 -0400520 /* Request the creation of an unitialized extent */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400521#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
Theodore Ts'oc2177052009-05-14 00:58:52 -0400522#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
523 EXT4_GET_BLOCKS_CREATE)
Theodore Ts'oc2177052009-05-14 00:58:52 -0400524 /* Caller is from the delayed allocation writeout path,
Theodore Ts'o60e66792010-05-17 07:00:00 -0400525 so set the magic i_delalloc_reserve_flag after taking the
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400526 inode allocation semaphore for */
Jan Kara03f5d8b2009-06-09 00:17:05 -0400527#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
Mingming Cao00314622009-09-28 15:49:08 -0400528 /* caller is from the direct IO path, request to creation of an
529 unitialized extents if not allocated, split the uninitialized
530 extent if blocks has been preallocated already*/
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500531#define EXT4_GET_BLOCKS_PRE_IO 0x0008
Aneesh Kumar K.V1296cc82010-01-15 01:27:59 -0500532#define EXT4_GET_BLOCKS_CONVERT 0x0010
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500533#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
Mingming Cao00314622009-09-28 15:49:08 -0400534 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500535 /* Convert extent to initialized after IO complete */
536#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
Jiaying Zhang744692d2010-03-04 16:14:02 -0500537 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
Allison Henderson55f020d2011-05-25 07:41:26 -0400538 /* Punch out blocks of an extent */
539#define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
Vivek Haldar556b27a2011-05-25 07:41:54 -0400540 /* Don't normalize allocation size (used for fallocate) */
541#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
Dmitry Monakhova4e5d882011-10-25 08:15:12 -0400542 /* Request will not result in inode size update (user for fallocate) */
543#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700544
545/*
Theodore Ts'oe6362602009-11-23 07:17:05 -0500546 * Flags used by ext4_free_blocks
547 */
548#define EXT4_FREE_BLOCKS_METADATA 0x0001
549#define EXT4_FREE_BLOCKS_FORGET 0x0002
Theodore Ts'o1f2acb62010-01-22 17:40:42 -0500550#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
Maxim Patlasov7132de72011-07-10 19:37:48 -0400551#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
Theodore Ts'o84130192011-09-09 18:50:51 -0400552#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
553#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
Theodore Ts'oe6362602009-11-23 07:17:05 -0500554
555/*
Allison Henderson4e96b2d2011-09-03 11:51:09 -0400556 * Flags used by ext4_discard_partial_page_buffers
557 */
558#define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700559
560/*
561 * ioctl commands
562 */
Mingming Cao617ba132006-10-11 01:20:53 -0700563#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
564#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
565#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
566#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
Mingming Cao617ba132006-10-11 01:20:53 -0700567#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
568#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Mingming Cao617ba132006-10-11 01:20:53 -0700569#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
570#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400571#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
572#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
573#define EXT4_IOC_MIGRATE _IO('f', 9)
Theodore Ts'occd25062009-02-26 01:04:07 -0500574 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400575 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
Theodore Ts'occd25062009-02-26 01:04:07 -0500576#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
Akira Fujita748de672009-06-17 19:24:03 -0400577#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700578
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400579#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700580/*
581 * ioctl commands in 32 bit emulation
582 */
Mingming Cao617ba132006-10-11 01:20:53 -0700583#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
584#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
585#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
586#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
587#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
588#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
589#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400590#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
Mingming Cao617ba132006-10-11 01:20:53 -0700591#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
592#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400593#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700594
Uwe Kleine-Königb5950762010-11-01 15:38:34 -0400595/* Max physical block we can address w/o extents */
Eric Sandeenfb0a3872009-09-16 14:45:10 -0400596#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
597
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700598/*
599 * Structure of an inode on the disk
600 */
Mingming Cao617ba132006-10-11 01:20:53 -0700601struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700602 __le16 i_mode; /* File mode */
603 __le16 i_uid; /* Low 16 bits of Owner Uid */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500604 __le32 i_size_lo; /* Size in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700605 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400606 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700607 __le32 i_mtime; /* Modification time */
608 __le32 i_dtime; /* Deletion Time */
609 __le16 i_gid; /* Low 16 bits of Group Id */
610 __le16 i_links_count; /* Links count */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500611 __le32 i_blocks_lo; /* Blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700612 __le32 i_flags; /* File flags */
613 union {
614 struct {
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500615 __le32 l_i_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700616 } linux1;
617 struct {
618 __u32 h_i_translator;
619 } hurd1;
620 struct {
621 __u32 m_i_reserved1;
622 } masix1;
623 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700624 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700625 __le32 i_generation; /* File version (for NFS) */
Aneesh Kumar K.V7973c0c2008-01-28 23:58:27 -0500626 __le32 i_file_acl_lo; /* File ACL */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500627 __le32 i_size_high;
Coly Lif077d0d2007-10-16 18:38:25 -0400628 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700629 union {
630 struct {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500631 __le16 l_i_blocks_high; /* were l_i_reserved1 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700632 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400633 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700634 __le16 l_i_gid_high; /* were reserved2[0] */
635 __u32 l_i_reserved2;
636 } linux2;
637 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400638 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700639 __u16 h_i_mode_high;
640 __u16 h_i_uid_high;
641 __u16 h_i_gid_high;
642 __u32 h_i_author;
643 } hurd2;
644 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400645 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700646 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700647 __u32 m_i_reserved2[2];
648 } masix2;
649 } osd2; /* OS dependent 2 */
650 __le16 i_extra_isize;
651 __le16 i_pad1;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400652 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
653 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
654 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
655 __le32 i_crtime; /* File Creation time */
656 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500657 __le32 i_version_hi; /* high 32 bits for 64-bit version */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700658};
659
Akira Fujita748de672009-06-17 19:24:03 -0400660struct move_extent {
661 __u32 reserved; /* should be zero */
662 __u32 donor_fd; /* donor file descriptor */
663 __u64 orig_start; /* logical start offset in block for orig */
664 __u64 donor_start; /* logical start offset in block for donor */
665 __u64 len; /* block length to be moved */
666 __u64 moved_len; /* moved block length */
667};
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700668
Kalpak Shahef7f3832007-07-18 09:15:20 -0400669#define EXT4_EPOCH_BITS 2
670#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
671#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
672
673/*
674 * Extended fields will fit into an inode if the filesystem was formatted
675 * with large inodes (-I 256 or larger) and there are not currently any EAs
676 * consuming all of the available space. For new inodes we always reserve
677 * enough space for the kernel's known extended fields, but for inodes
678 * created with an old kernel this might not have been the case. None of
679 * the extended inode fields is critical for correct filesystem operation.
680 * This macro checks if a certain field fits in the inode. Note that
681 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
682 */
683#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
684 ((offsetof(typeof(*ext4_inode), field) + \
685 sizeof((ext4_inode)->field)) \
686 <= (EXT4_GOOD_OLD_INODE_SIZE + \
687 (einode)->i_extra_isize)) \
688
689static inline __le32 ext4_encode_extra_time(struct timespec *time)
690{
691 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400692 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
693 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
Kalpak Shahef7f3832007-07-18 09:15:20 -0400694}
695
696static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
697{
698 if (sizeof(time->tv_sec) > 4)
699 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
700 << 32;
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400701 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400702}
703
704#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
705do { \
706 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
707 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
708 (raw_inode)->xtime ## _extra = \
709 ext4_encode_extra_time(&(inode)->xtime); \
710} while (0)
711
712#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
713do { \
714 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
715 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
716 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
717 (raw_inode)->xtime ## _extra = \
718 ext4_encode_extra_time(&(einode)->xtime); \
719} while (0)
720
721#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
722do { \
723 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
724 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
725 ext4_decode_extra_time(&(inode)->xtime, \
726 raw_inode->xtime ## _extra); \
Eric Sandeenaf0b44a2010-12-19 22:10:31 -0500727 else \
728 (inode)->xtime.tv_nsec = 0; \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400729} while (0)
730
731#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
732do { \
733 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
734 (einode)->xtime.tv_sec = \
735 (signed)le32_to_cpu((raw_inode)->xtime); \
736 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
737 ext4_decode_extra_time(&(einode)->xtime, \
738 raw_inode->xtime ## _extra); \
Eric Sandeenaf0b44a2010-12-19 22:10:31 -0500739 else \
740 (einode)->xtime.tv_nsec = 0; \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400741} while (0)
742
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500743#define i_disk_version osd1.linux1.l_i_version
744
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700745#if defined(__KERNEL__) || defined(__linux__)
746#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700747#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500748#define i_blocks_high osd2.linux2.l_i_blocks_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700749#define i_uid_low i_uid
750#define i_gid_low i_gid
751#define i_uid_high osd2.linux2.l_i_uid_high
752#define i_gid_high osd2.linux2.l_i_gid_high
753#define i_reserved2 osd2.linux2.l_i_reserved2
754
755#elif defined(__GNU__)
756
757#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700758#define i_uid_high osd2.hurd2.h_i_uid_high
759#define i_gid_high osd2.hurd2.h_i_gid_high
760#define i_author osd2.hurd2.h_i_author
761
762#elif defined(__masix__)
763
764#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700765#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700766#define i_reserved2 osd2.masix2.m_i_reserved2
767
768#endif /* defined(__KERNEL__) || defined(__linux__) */
769
770/*
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400771 * storage for cached extent
Theodore Ts'ob05e6ae2011-01-10 12:13:26 -0500772 * If ec_len == 0, then the cache is invalid.
773 * If ec_start == 0, then the cache represents a gap (null mapping)
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400774 */
775struct ext4_ext_cache {
776 ext4_fsblk_t ec_start;
777 ext4_lblk_t ec_block;
778 __u32 ec_len; /* must be 32bit to return holes */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400779};
780
781/*
782 * fourth extended file system inode data in memory
783 */
784struct ext4_inode_info {
785 __le32 i_data[15]; /* unconverted */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400786 __u32 i_dtime;
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400787 ext4_fsblk_t i_file_acl;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400788
789 /*
790 * i_block_group is the number of the block group which contains
791 * this file's inode. Constant across the lifetime of the inode,
792 * it is ued for making block allocation decisions - we try to
793 * place a file's data blocks near its inode block, and new inodes
794 * near to their parent directory's inode.
795 */
796 ext4_group_t i_block_group;
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500797 ext4_lblk_t i_dir_start_lookup;
Theodore Ts'o353eb832011-01-10 12:18:25 -0500798#if (BITS_PER_LONG < 64)
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500799 unsigned long i_state_flags; /* Dynamic state flags */
Theodore Ts'o353eb832011-01-10 12:18:25 -0500800#endif
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400801 unsigned long i_flags;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400802
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400803#ifdef CONFIG_EXT4_FS_XATTR
804 /*
805 * Extended attributes can be read independently of the main file
806 * data. Taking i_mutex even when reading would cause contention
807 * between readers of EAs and writers of regular file data, so
808 * instead we synchronize on xattr_sem when reading or changing
809 * EAs.
810 */
811 struct rw_semaphore xattr_sem;
812#endif
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400813
814 struct list_head i_orphan; /* unlinked but open inodes */
815
816 /*
817 * i_disksize keeps track of what the inode size is ON DISK, not
818 * in memory. During truncate, i_size is set to the new size by
819 * the VFS prior to calling ext4_truncate(), but the filesystem won't
820 * set i_disksize to 0 until the truncate is actually under way.
821 *
822 * The intent is that i_disksize always represents the blocks which
823 * are used by this file. This allows recovery to restart truncate
824 * on orphans if we crash during truncate. We actually write i_disksize
825 * into the on-disk inode when writing inodes out, instead of i_size.
826 *
827 * The only time when i_disksize and i_size may be different is when
828 * a truncate is in progress. The only things which change i_disksize
829 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
830 */
831 loff_t i_disksize;
832
833 /*
834 * i_data_sem is for serialising ext4_truncate() against
835 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
836 * data tree are chopped off during truncate. We can't do that in
837 * ext4 because whenever we perform intermediate commits during
838 * truncate, the inode and all the metadata blocks *must* be in a
839 * consistent state which allows truncation of the orphans to restart
840 * during recovery. Hence we must fix the get_block-vs-truncate race
841 * by other means, so we have i_data_sem.
842 */
843 struct rw_semaphore i_data_sem;
844 struct inode vfs_inode;
Theodore Ts'o8aefcd52011-01-10 12:29:43 -0500845 struct jbd2_inode *jinode;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400846
847 struct ext4_ext_cache i_cached_extent;
848 /*
849 * File creation time. Its function is same as that of
850 * struct timespec i_{a,c,m}time in the generic inode.
851 */
852 struct timespec i_crtime;
853
854 /* mballoc */
855 struct list_head i_prealloc_list;
856 spinlock_t i_prealloc_lock;
857
858 /* ialloc */
859 ext4_group_t i_last_alloc_group;
860
861 /* allocation reservation info for delalloc */
Theodore Ts'o57042652011-09-09 18:56:51 -0400862 /* In case of bigalloc, these refer to clusters rather than blocks */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400863 unsigned int i_reserved_data_blocks;
864 unsigned int i_reserved_meta_blocks;
865 unsigned int i_allocated_meta_blocks;
Theodore Ts'o01f49d02011-01-10 12:13:03 -0500866 ext4_lblk_t i_da_metadata_calc_last_lblock;
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500867 int i_da_metadata_calc_len;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400868
869 /* on-disk additional length */
870 __u16 i_extra_isize;
871
Dmitry Monakhova9e7f442009-12-14 15:21:14 +0300872#ifdef CONFIG_QUOTA
873 /* quota space reservation, managed internally by quota code */
874 qsize_t i_reserved_quota;
875#endif
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400876
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500877 /* completed IOs that might need unwritten extents handling */
878 struct list_head i_completed_io_list;
Jiaying Zhang744692d2010-03-04 16:14:02 -0500879 spinlock_t i_completed_io_lock;
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500880 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400881 /* current io_end structure for async DIO write*/
882 ext4_io_end_t *cur_aio_dio;
Eric Sandeene9e3bce2011-02-12 08:17:34 -0500883 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
Theodore Ts'o8a2005d2011-01-10 12:13:42 -0500884
885 spinlock_t i_block_reservation_lock;
Jan Karab436b9b2009-12-08 23:51:10 -0500886
887 /*
888 * Transactions that contain inode's metadata needed to complete
889 * fsync and fdatasync, respectively.
890 */
891 tid_t i_sync_tid;
892 tid_t i_datasync_tid;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400893};
894
895/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700896 * File system states
897 */
Mingming Cao617ba132006-10-11 01:20:53 -0700898#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
899#define EXT4_ERROR_FS 0x0002 /* Errors detected */
900#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700901
902/*
Theodore Tso469108f2008-02-10 01:11:44 -0500903 * Misc. filesystem flags
904 */
905#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
906#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
907#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
908
909/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700910 * Mount flags
911 */
Mingming Cao617ba132006-10-11 01:20:53 -0700912#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
913#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
914#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
915#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
916#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
917#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
918#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
Mingming Cao617ba132006-10-11 01:20:53 -0700919#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
920#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
921#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
922#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
923#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
924#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
925#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
926#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
Theodore Ts'oafd46722009-03-16 23:12:23 -0400927#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
Mingming Cao617ba132006-10-11 01:20:53 -0700928#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
Mingming Cao617ba132006-10-11 01:20:53 -0700929#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
930#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
931#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Jiaying Zhang744692d2010-03-04 16:14:02 -0500932#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
Linus Torvaldsd4da6c92009-11-02 10:15:27 -0800933#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500934#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500935#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
Theodore Ts'o14490322010-12-14 15:27:50 -0500936#define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
Alex Tomas64769242008-07-11 19:27:31 -0400937#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400938#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400939#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
Eric Sandeen5328e632009-11-19 14:25:42 -0500940#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
Lukas Czernerbfff6872010-10-27 21:30:05 -0400941#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400942
Theodore Ts'o56889782011-09-03 18:22:38 -0400943#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
944 specified delalloc */
945
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -0500946#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
947 ~EXT4_MOUNT_##opt
948#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
949 EXT4_MOUNT_##opt
Mingming Cao617ba132006-10-11 01:20:53 -0700950#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
951 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700952
Theodore Ts'oa2595b82010-12-15 20:30:48 -0500953#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
954 ~EXT4_MOUNT2_##opt
955#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
956 EXT4_MOUNT2_##opt
957#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
958 EXT4_MOUNT2_##opt)
959
Akinobu Mita50e01682011-03-23 16:42:07 -0700960#define ext4_set_bit __test_and_set_bit_le
Mingming Cao617ba132006-10-11 01:20:53 -0700961#define ext4_set_bit_atomic ext2_set_bit_atomic
Akinobu Mita50e01682011-03-23 16:42:07 -0700962#define ext4_clear_bit __test_and_clear_bit_le
Mingming Cao617ba132006-10-11 01:20:53 -0700963#define ext4_clear_bit_atomic ext2_clear_bit_atomic
Akinobu Mita50e01682011-03-23 16:42:07 -0700964#define ext4_test_bit test_bit_le
965#define ext4_find_first_zero_bit find_first_zero_bit_le
966#define ext4_find_next_zero_bit find_next_zero_bit_le
967#define ext4_find_next_bit find_next_bit_le
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700968
Yongqiang Yangc3e94d12011-07-26 22:05:53 -0400969extern void ext4_set_bits(void *bm, int cur, int len);
970
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700971/*
972 * Maximal mount counts between two filesystem checks
973 */
Mingming Cao617ba132006-10-11 01:20:53 -0700974#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
975#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700976
977/*
978 * Behaviour when detecting errors
979 */
Mingming Cao617ba132006-10-11 01:20:53 -0700980#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
981#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
982#define EXT4_ERRORS_PANIC 3 /* Panic */
983#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700984
985/*
986 * Structure of the super block
987 */
Mingming Cao617ba132006-10-11 01:20:53 -0700988struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700989/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -0400990 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -0400991 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
992 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700993/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
994 __le32 s_first_data_block; /* First Data Block */
995 __le32 s_log_block_size; /* Block size */
Theodore Ts'o281b5992011-09-09 18:34:51 -0400996 __le32 s_log_cluster_size; /* Allocation cluster size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700997/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Theodore Ts'o281b5992011-09-09 18:34:51 -0400998 __le32 s_clusters_per_group; /* # Clusters per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700999 __le32 s_inodes_per_group; /* # Inodes per group */
1000 __le32 s_mtime; /* Mount time */
1001/*30*/ __le32 s_wtime; /* Write time */
1002 __le16 s_mnt_count; /* Mount count */
1003 __le16 s_max_mnt_count; /* Maximal mount count */
1004 __le16 s_magic; /* Magic signature */
1005 __le16 s_state; /* File system state */
1006 __le16 s_errors; /* Behaviour when detecting errors */
1007 __le16 s_minor_rev_level; /* minor revision level */
1008/*40*/ __le32 s_lastcheck; /* time of last check */
1009 __le32 s_checkinterval; /* max. time between checks */
1010 __le32 s_creator_os; /* OS */
1011 __le32 s_rev_level; /* Revision level */
1012/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1013 __le16 s_def_resgid; /* Default gid for reserved blocks */
1014 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001015 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001016 *
1017 * Note: the difference between the compatible feature set and
1018 * the incompatible feature set is that if there is a bit set
1019 * in the incompatible feature set that the kernel doesn't
1020 * know about, it should refuse to mount the filesystem.
1021 *
1022 * e2fsck's requirements are more strict; if it doesn't know
1023 * about a feature in either the compatible or incompatible
1024 * feature set, it must abort and not try to meddle with
1025 * things it doesn't understand...
1026 */
1027 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001028 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001029 __le16 s_block_group_nr; /* block group # of this superblock */
1030 __le32 s_feature_compat; /* compatible feature set */
1031/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1032 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1033/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1034/*78*/ char s_volume_name[16]; /* volume name */
1035/*88*/ char s_last_mounted[64]; /* directory where last mounted */
1036/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1037 /*
1038 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -07001039 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001040 */
1041 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1042 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1043 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1044 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001045 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001046 */
1047/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1048/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1049 __le32 s_journal_dev; /* device number of journal file */
1050 __le32 s_last_orphan; /* start of list of inodes to delete */
1051 __le32 s_hash_seed[4]; /* HTREE hash seed */
1052 __u8 s_def_hash_version; /* Default hash version to use */
Theodore Ts'o89eeddf2010-07-27 11:56:04 -04001053 __u8 s_jnl_backup_type;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001054 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001055/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001056 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001057 __le32 s_mkfs_time; /* When the filesystem was created */
1058 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1059 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1060/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1061 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1062 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -04001063 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1064 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1065 __le32 s_flags; /* Miscellaneous flags */
1066 __le16 s_raid_stride; /* RAID stride */
Johann Lombardic5e06d12011-05-24 18:31:25 -04001067 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -04001068 __le64 s_mmp_block; /* Block for multi-mount protection */
1069 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001070 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
Theodore Ts'o89eeddf2010-07-27 11:56:04 -04001071 __u8 s_reserved_char_pad;
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001072 __le16 s_reserved_pad;
Theodore Ts'oafc32f72009-02-28 19:39:58 -05001073 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
Theodore Ts'o4a9cdec2010-06-29 11:00:23 -04001074 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1075 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1076 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1077 snapshot's future use */
1078 __le32 s_snapshot_list; /* inode number of the head of the
1079 on-disk snapshot list */
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04001080#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1081 __le32 s_error_count; /* number of fs errors */
1082 __le32 s_first_error_time; /* first time an error happened */
1083 __le32 s_first_error_ino; /* inode involved in first error */
1084 __le64 s_first_error_block; /* block involved of first error */
1085 __u8 s_first_error_func[32]; /* function where the error happened */
1086 __le32 s_first_error_line; /* line number where error happened */
1087 __le32 s_last_error_time; /* most recent time of an error */
1088 __le32 s_last_error_ino; /* inode involved in last error */
1089 __le32 s_last_error_line; /* line number where error happened */
1090 __le64 s_last_error_block; /* block involved of last error */
1091 __u8 s_last_error_func[32]; /* function where the error happened */
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001092#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1093 __u8 s_mount_opts[64];
Theodore Ts'o281b5992011-09-09 18:34:51 -04001094 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1095 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1096 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1097 __le32 s_reserved[109]; /* Padding to the end of the block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001098};
1099
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04001100#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1101
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001102#ifdef __KERNEL__
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001103
1104/*
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001105 * run-time mount flags
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001106 */
1107#define EXT4_MF_MNTDIR_SAMPLED 0x0001
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001108#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001109
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001110/*
1111 * fourth extended-fs super-block data in memory
1112 */
1113struct ext4_sb_info {
1114 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1115 unsigned long s_inodes_per_block;/* Number of inodes per block */
1116 unsigned long s_blocks_per_group;/* Number of blocks in a group */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001117 unsigned long s_clusters_per_group; /* Number of clusters in a group */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001118 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1119 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1120 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1121 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1122 ext4_group_t s_groups_count; /* Number of groups in the fs */
Eric Sandeenfb0a3872009-09-16 14:45:10 -04001123 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001124 unsigned long s_overhead_last; /* Last calculated overhead */
1125 unsigned long s_blocks_last; /* Last seen block count */
Theodore Ts'o281b5992011-09-09 18:34:51 -04001126 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1127 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001128 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1129 struct buffer_head * s_sbh; /* Buffer containing the super block */
1130 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1131 struct buffer_head **s_group_desc;
Theodore Ts'o7f4520c2009-06-13 10:09:41 -04001132 unsigned int s_mount_opt;
Theodore Ts'oa2595b82010-12-15 20:30:48 -05001133 unsigned int s_mount_opt2;
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001134 unsigned int s_mount_flags;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001135 ext4_fsblk_t s_sb_block;
1136 uid_t s_resuid;
1137 gid_t s_resgid;
1138 unsigned short s_mount_state;
1139 unsigned short s_pad;
1140 int s_addr_per_block_bits;
1141 int s_desc_per_block_bits;
1142 int s_inode_size;
1143 int s_first_ino;
1144 unsigned int s_inode_readahead_blks;
Andreas Dilger11013912009-06-13 11:45:35 -04001145 unsigned int s_inode_goal;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001146 spinlock_t s_next_gen_lock;
1147 u32 s_next_generation;
1148 u32 s_hash_seed[4];
1149 int s_def_hash_version;
1150 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
Theodore Ts'o57042652011-09-09 18:56:51 -04001151 struct percpu_counter s_freeclusters_counter;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001152 struct percpu_counter s_freeinodes_counter;
1153 struct percpu_counter s_dirs_counter;
Theodore Ts'o57042652011-09-09 18:56:51 -04001154 struct percpu_counter s_dirtyclusters_counter;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001155 struct blockgroup_lock *s_blockgroup_lock;
1156 struct proc_dir_entry *s_proc;
1157 struct kobject s_kobj;
1158 struct completion s_kobj_unregister;
1159
1160 /* Journaling */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001161 struct journal_s *s_journal;
1162 struct list_head s_orphan;
1163 struct mutex s_orphan_lock;
Yongqiang Yang8f82f842011-07-26 21:35:44 -04001164 unsigned long s_resize_flags; /* Flags indicating if there
1165 is a resizer */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001166 unsigned long s_commit_interval;
1167 u32 s_max_batch_time;
1168 u32 s_min_batch_time;
1169 struct block_device *journal_bdev;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001170#ifdef CONFIG_QUOTA
1171 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1172 int s_jquota_fmt; /* Format of quota to use */
1173#endif
1174 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001175 struct rb_root system_blks;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001176
1177#ifdef EXTENTS_STATS
1178 /* ext4 extents stats */
1179 unsigned long s_ext_min;
1180 unsigned long s_ext_max;
1181 unsigned long s_depth_max;
1182 spinlock_t s_ext_stats_lock;
1183 unsigned long s_ext_blocks;
1184 unsigned long s_ext_extents;
1185#endif
Vivek Haldar77f41352011-05-22 21:24:16 -04001186 /* ext4 extent cache stats */
1187 unsigned long extent_cache_hits;
1188 unsigned long extent_cache_misses;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001189
1190 /* for buddy allocator */
1191 struct ext4_group_info ***s_group_info;
1192 struct inode *s_buddy_cache;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001193 spinlock_t s_md_lock;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001194 unsigned short *s_mb_offsets;
1195 unsigned int *s_mb_maxs;
1196
1197 /* tunables */
1198 unsigned long s_stripe;
1199 unsigned int s_mb_stream_request;
1200 unsigned int s_mb_max_to_scan;
1201 unsigned int s_mb_min_to_scan;
1202 unsigned int s_mb_stats;
1203 unsigned int s_mb_order2_reqs;
1204 unsigned int s_mb_group_prealloc;
Theodore Ts'o55138e02009-09-29 13:31:31 -04001205 unsigned int s_max_writeback_mb_bump;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001206 /* where last allocation was done - for stream allocation */
1207 unsigned long s_mb_last_group;
1208 unsigned long s_mb_last_start;
1209
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001210 /* stats for buddy allocator */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001211 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1212 atomic_t s_bal_success; /* we found long enough chunks */
1213 atomic_t s_bal_allocated; /* in blocks */
1214 atomic_t s_bal_ex_scanned; /* total extents scanned */
1215 atomic_t s_bal_goals; /* goal hits */
1216 atomic_t s_bal_breaks; /* too long searches */
1217 atomic_t s_bal_2orders; /* 2^order hits */
1218 spinlock_t s_bal_lock;
1219 unsigned long s_mb_buddies_generated;
1220 unsigned long long s_mb_generation_time;
1221 atomic_t s_mb_lost_chunks;
1222 atomic_t s_mb_preallocated;
1223 atomic_t s_mb_discarded;
Theodore Ts'o50797482009-09-18 13:34:02 -04001224 atomic_t s_lock_busy;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001225
1226 /* locality groups */
Tejun Heo003cb602010-02-02 14:39:01 +09001227 struct ext4_locality_group __percpu *s_locality_groups;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001228
1229 /* for write statistics */
1230 unsigned long s_sectors_written_start;
1231 u64 s_kbytes_written;
1232
1233 unsigned int s_log_groups_per_flex;
1234 struct flex_groups *s_flex_groups;
Mingming Cao4c0425f2009-09-28 15:48:41 -04001235
1236 /* workqueue for dio unwritten */
1237 struct workqueue_struct *dio_unwritten_wq;
Theodore Ts'o66e61a92010-07-27 11:56:04 -04001238
1239 /* timer for periodic error stats printing */
1240 struct timer_list s_err_report;
Lukas Czernerbfff6872010-10-27 21:30:05 -04001241
1242 /* Lazy inode table initialization info */
1243 struct ext4_li_request *s_li_request;
1244 /* Wait multiplier for lazy initialization thread */
1245 unsigned int s_li_wait_mult;
Johann Lombardic5e06d12011-05-24 18:31:25 -04001246
1247 /* Kernel thread for multiple mount protection */
1248 struct task_struct *s_mmp_tsk;
Tao Ma3d56b8d2011-07-11 00:03:38 -04001249
1250 /* record the last minlen when FITRIM is called. */
1251 atomic_t s_last_trim_minblks;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001252};
1253
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001254static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001255{
1256 return sb->s_fs_info;
1257}
Mingming Cao617ba132006-10-11 01:20:53 -07001258static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001259{
Mingming Cao617ba132006-10-11 01:20:53 -07001260 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001261}
1262
Kalpak Shahef7f3832007-07-18 09:15:20 -04001263static inline struct timespec ext4_current_time(struct inode *inode)
1264{
1265 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1266 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1267}
1268
Mingming Cao617ba132006-10-11 01:20:53 -07001269static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001270{
Mingming Cao617ba132006-10-11 01:20:53 -07001271 return ino == EXT4_ROOT_INO ||
1272 ino == EXT4_JOURNAL_INO ||
1273 ino == EXT4_RESIZE_INO ||
1274 (ino >= EXT4_FIRST_INO(sb) &&
1275 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001276}
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001277
Tao Ma0edeb712011-10-31 17:30:44 -04001278static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1279 struct ext4_io_end *io_end)
1280{
1281 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1282 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1283 atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten);
1284 }
1285}
1286
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001287/*
1288 * Inode dynamic state flags
1289 */
1290enum {
1291 EXT4_STATE_JDATA, /* journaled data exists */
1292 EXT4_STATE_NEW, /* inode is newly created */
1293 EXT4_STATE_XATTR, /* has in-inode xattrs */
1294 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1295 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1296 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1297 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
Frank Mayhar14ece102010-05-17 08:00:00 -04001298 EXT4_STATE_NEWENTRY, /* File just added to dir */
Theodore Ts'of2321092011-01-10 12:12:36 -05001299 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001300};
1301
Theodore Ts'o353eb832011-01-10 12:18:25 -05001302#define EXT4_INODE_BIT_FNS(name, field, offset) \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001303static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1304{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001305 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001306} \
1307static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1308{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001309 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001310} \
1311static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1312{ \
Theodore Ts'o353eb832011-01-10 12:18:25 -05001313 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001314}
1315
Theodore Ts'o353eb832011-01-10 12:18:25 -05001316EXT4_INODE_BIT_FNS(flag, flags, 0)
1317#if (BITS_PER_LONG < 64)
1318EXT4_INODE_BIT_FNS(state, state_flags, 0)
1319
1320static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1321{
1322 (ei)->i_state_flags = 0;
1323}
1324#else
1325EXT4_INODE_BIT_FNS(state, flags, 32)
1326
1327static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1328{
1329 /* We depend on the fact that callers will set i_flags */
1330}
1331#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001332#else
Mingming Cao617ba132006-10-11 01:20:53 -07001333/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001334 * a kernel struct super_block. This will allow us to call the feature-test
1335 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -07001336#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001337#endif
1338
Mingming Cao617ba132006-10-11 01:20:53 -07001339#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001340
1341/*
1342 * Codes for operating systems
1343 */
Mingming Cao617ba132006-10-11 01:20:53 -07001344#define EXT4_OS_LINUX 0
1345#define EXT4_OS_HURD 1
1346#define EXT4_OS_MASIX 2
1347#define EXT4_OS_FREEBSD 3
1348#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001349
1350/*
1351 * Revision levels
1352 */
Mingming Cao617ba132006-10-11 01:20:53 -07001353#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1354#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001355
Mingming Cao617ba132006-10-11 01:20:53 -07001356#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1357#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001358
Mingming Cao617ba132006-10-11 01:20:53 -07001359#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001360
1361/*
1362 * Feature set definitions
1363 */
1364
Mingming Cao617ba132006-10-11 01:20:53 -07001365#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001366 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001367#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001368 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001369#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001370 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001371#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1372 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1373#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1374 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1375#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1376 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1377#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1378 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1379#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1380 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1381#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1382 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001383
Mingming Cao617ba132006-10-11 01:20:53 -07001384#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1385#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1386#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1387#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1388#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1389#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001390
Mingming Cao617ba132006-10-11 01:20:53 -07001391#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1392#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1393#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001394#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
Andreas Dilger717d50e2007-10-16 18:38:25 -04001395#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001396#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -04001397#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Aditya Kaliae812302011-05-24 19:00:39 -04001398#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
Theodore Ts'o281b5992011-09-09 18:34:51 -04001399#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001400
Mingming Cao617ba132006-10-11 01:20:53 -07001401#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1402#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1403#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1404#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1405#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -07001406#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001407#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001408#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
Jose R. Santosce421582007-10-16 18:38:25 -04001409#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Theodore Ts'of710b4b2010-01-25 03:31:32 -05001410#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1411#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001412
Theodore Ts'o2035e772011-04-18 17:29:14 -04001413#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1414#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1415 EXT4_FEATURE_INCOMPAT_META_BG)
1416#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1417 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1418 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1419
1420#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1421#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1422 EXT4_FEATURE_INCOMPAT_RECOVER| \
1423 EXT4_FEATURE_INCOMPAT_META_BG)
1424#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1425 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1426 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1427
Mingming Cao617ba132006-10-11 01:20:53 -07001428#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1429#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1430 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -07001431 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001432 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -04001433 EXT4_FEATURE_INCOMPAT_64BIT| \
Johann Lombardic5e06d12011-05-24 18:31:25 -04001434 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1435 EXT4_FEATURE_INCOMPAT_MMP)
Mingming Cao617ba132006-10-11 01:20:53 -07001436#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1437 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -04001438 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001439 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -04001440 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001441 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
Theodore Ts'o6f16b602011-09-09 19:06:51 -04001442 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1443 EXT4_FEATURE_RO_COMPAT_BIGALLOC)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001444
1445/*
1446 * Default values for user and/or group using reserved blocks
1447 */
Mingming Cao617ba132006-10-11 01:20:53 -07001448#define EXT4_DEF_RESUID 0
1449#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001450
Theodore Ts'o240799c2008-10-09 23:53:47 -04001451#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1452
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001453/*
1454 * Default mount options
1455 */
Mingming Cao617ba132006-10-11 01:20:53 -07001456#define EXT4_DEFM_DEBUG 0x0001
1457#define EXT4_DEFM_BSDGROUPS 0x0002
1458#define EXT4_DEFM_XATTR_USER 0x0004
1459#define EXT4_DEFM_ACL 0x0008
1460#define EXT4_DEFM_UID16 0x0010
1461#define EXT4_DEFM_JMODE 0x0060
1462#define EXT4_DEFM_JMODE_DATA 0x0020
1463#define EXT4_DEFM_JMODE_ORDERED 0x0040
1464#define EXT4_DEFM_JMODE_WBACK 0x0060
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001465#define EXT4_DEFM_NOBARRIER 0x0100
1466#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1467#define EXT4_DEFM_DISCARD 0x0400
1468#define EXT4_DEFM_NODELALLOC 0x0800
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001469
1470/*
Theodore Ts'o30773842009-01-03 20:27:38 -05001471 * Default journal batch times
1472 */
1473#define EXT4_DEF_MIN_BATCH_TIME 0
1474#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1475
1476/*
Theodore Ts'oa4912122009-03-12 12:18:34 -04001477 * Minimum number of groups in a flexgroup before we separate out
1478 * directories into the first block group of a flexgroup
1479 */
1480#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1481
1482/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001483 * Structure of a directory entry
1484 */
Mingming Cao617ba132006-10-11 01:20:53 -07001485#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001486
Mingming Cao617ba132006-10-11 01:20:53 -07001487struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001488 __le32 inode; /* Inode number */
1489 __le16 rec_len; /* Directory entry length */
1490 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -07001491 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001492};
1493
1494/*
Mingming Cao617ba132006-10-11 01:20:53 -07001495 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001496 * stored in intel byte order, and the name_len field could never be
1497 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1498 * file_type field.
1499 */
Mingming Cao617ba132006-10-11 01:20:53 -07001500struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001501 __le32 inode; /* Inode number */
1502 __le16 rec_len; /* Directory entry length */
1503 __u8 name_len; /* Name length */
1504 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -07001505 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001506};
1507
1508/*
Mingming Cao617ba132006-10-11 01:20:53 -07001509 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001510 * other bits are reserved for now.
1511 */
Mingming Cao617ba132006-10-11 01:20:53 -07001512#define EXT4_FT_UNKNOWN 0
1513#define EXT4_FT_REG_FILE 1
1514#define EXT4_FT_DIR 2
1515#define EXT4_FT_CHRDEV 3
1516#define EXT4_FT_BLKDEV 4
1517#define EXT4_FT_FIFO 5
1518#define EXT4_FT_SOCK 6
1519#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001520
Mingming Cao617ba132006-10-11 01:20:53 -07001521#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001522
1523/*
Mingming Cao617ba132006-10-11 01:20:53 -07001524 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001525 *
1526 * NOTE: It must be a multiple of 4
1527 */
Mingming Cao617ba132006-10-11 01:20:53 -07001528#define EXT4_DIR_PAD 4
1529#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1530#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1531 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -05001532#define EXT4_MAX_REC_LEN ((1<<16)-1)
1533
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001534/*
Eric Sandeen0cfc9252010-08-05 01:46:37 -04001535 * If we ever get support for fs block sizes > page_size, we'll need
1536 * to remove the #if statements in the next two functions...
1537 */
1538static inline unsigned int
1539ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1540{
1541 unsigned len = le16_to_cpu(dlen);
1542
1543#if (PAGE_CACHE_SIZE >= 65536)
1544 if (len == EXT4_MAX_REC_LEN || len == 0)
1545 return blocksize;
1546 return (len & 65532) | ((len & 3) << 16);
1547#else
1548 return len;
1549#endif
1550}
1551
1552static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1553{
1554 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1555 BUG();
1556#if (PAGE_CACHE_SIZE >= 65536)
1557 if (len < 65536)
1558 return cpu_to_le16(len);
1559 if (len == blocksize) {
1560 if (blocksize == 65536)
1561 return cpu_to_le16(EXT4_MAX_REC_LEN);
1562 else
1563 return cpu_to_le16(0);
1564 }
1565 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1566#else
1567 return cpu_to_le16(len);
1568#endif
1569}
1570
1571/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001572 * Hash Tree Directory indexing
1573 * (c) Daniel Phillips, 2001
1574 */
1575
Eric Sandeen4074fe32007-10-16 18:38:25 -04001576#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1577 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001578 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
Mingming Cao617ba132006-10-11 01:20:53 -07001579#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1580#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001581
1582/* Legal values for the dx_root hash_version field: */
1583
1584#define DX_HASH_LEGACY 0
1585#define DX_HASH_HALF_MD4 1
1586#define DX_HASH_TEA 2
Theodore Ts'of99b2582008-10-28 13:21:44 -04001587#define DX_HASH_LEGACY_UNSIGNED 3
1588#define DX_HASH_HALF_MD4_UNSIGNED 4
1589#define DX_HASH_TEA_UNSIGNED 5
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001590
1591#ifdef __KERNEL__
1592
1593/* hash info structure used by the directory hash */
1594struct dx_hash_info
1595{
1596 u32 hash;
1597 u32 minor_hash;
1598 int hash_version;
1599 u32 *seed;
1600};
1601
Mingming Cao617ba132006-10-11 01:20:53 -07001602#define EXT4_HTREE_EOF 0x7fffffff
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001603
1604/*
Mingming Cao617ba132006-10-11 01:20:53 -07001605 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001606 */
1607#define HASH_NB_ALWAYS 1
1608
1609
1610/*
1611 * Describe an inode's exact location on disk and in memory
1612 */
Mingming Cao617ba132006-10-11 01:20:53 -07001613struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001614{
1615 struct buffer_head *bh;
1616 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001617 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001618};
1619
Mingming Cao617ba132006-10-11 01:20:53 -07001620static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001621{
Mingming Cao617ba132006-10-11 01:20:53 -07001622 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001623}
1624
1625/*
1626 * This structure is stuffed into the struct file's private_data field
1627 * for directories. It is where we put information so that we can do
1628 * readdir operations in hash tree order.
1629 */
1630struct dir_private_info {
1631 struct rb_root root;
1632 struct rb_node *curr_node;
1633 struct fname *extra_fname;
1634 loff_t last_pos;
1635 __u32 curr_hash;
1636 __u32 curr_minor_hash;
1637 __u32 next_hash;
1638};
1639
1640/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -07001641static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001642ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001643{
Mingming Cao617ba132006-10-11 01:20:53 -07001644 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1645 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001646}
1647
1648/*
1649 * Special error return code only used by dx_probe() and its callers.
1650 */
1651#define ERR_BAD_DX_DIR -75000
1652
Andrew Morton72b64b52006-10-11 01:21:18 -07001653void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001654 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001655
1656/*
Lukas Czernerbfff6872010-10-27 21:30:05 -04001657 * Timeout and state flag for lazy initialization inode thread.
1658 */
1659#define EXT4_DEF_LI_WAIT_MULT 10
1660#define EXT4_DEF_LI_MAX_START_DELAY 5
1661#define EXT4_LAZYINIT_QUIT 0x0001
1662#define EXT4_LAZYINIT_RUNNING 0x0002
1663
1664/*
1665 * Lazy inode table initialization info
1666 */
1667struct ext4_lazy_init {
1668 unsigned long li_state;
Lukas Czernerbfff6872010-10-27 21:30:05 -04001669 struct list_head li_request_list;
1670 struct mutex li_list_mtx;
1671};
1672
1673struct ext4_li_request {
1674 struct super_block *lr_super;
1675 struct ext4_sb_info *lr_sbi;
1676 ext4_group_t lr_next_group;
1677 struct list_head lr_request;
1678 unsigned long lr_next_sched;
1679 unsigned long lr_timeout;
1680};
1681
Lukas Czerner857ac882010-10-27 21:30:05 -04001682struct ext4_features {
1683 struct kobject f_kobj;
1684 struct completion f_kobj_unregister;
1685};
1686
Lukas Czernerbfff6872010-10-27 21:30:05 -04001687/*
Johann Lombardic5e06d12011-05-24 18:31:25 -04001688 * This structure will be used for multiple mount protection. It will be
1689 * written into the block number saved in the s_mmp_block field in the
1690 * superblock. Programs that check MMP should assume that if
1691 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1692 * to use the filesystem, regardless of how old the timestamp is.
1693 */
1694#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1695#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1696#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1697#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1698
1699struct mmp_struct {
1700 __le32 mmp_magic; /* Magic number for MMP */
1701 __le32 mmp_seq; /* Sequence no. updated periodically */
1702
1703 /*
1704 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1705 * purposes and do not affect the correctness of the algorithm
1706 */
1707 __le64 mmp_time; /* Time last updated */
1708 char mmp_nodename[64]; /* Node which last updated MMP block */
1709 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1710
1711 /*
1712 * mmp_check_interval is used to verify if the MMP block has been
1713 * updated on the block device. The value is updated based on the
1714 * maximum time to write the MMP block during an update cycle.
1715 */
1716 __le16 mmp_check_interval;
1717
1718 __le16 mmp_pad1;
1719 __le32 mmp_pad2[227];
1720};
1721
1722/* arguments passed to the mmp thread */
1723struct mmpd_data {
1724 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1725 struct super_block *sb; /* super block of the fs */
1726};
1727
1728/*
1729 * Check interval multiplier
1730 * The MMP block is written every update interval and initially checked every
1731 * update interval x the multiplier (the value is then adapted based on the
1732 * write latency). The reason is that writes can be delayed under load and we
1733 * don't want readers to incorrectly assume that the filesystem is no longer
1734 * in use.
1735 */
1736#define EXT4_MMP_CHECK_MULT 2UL
1737
1738/*
1739 * Minimum interval for MMP checking in seconds.
1740 */
1741#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1742
1743/*
1744 * Maximum interval for MMP checking in seconds.
1745 */
1746#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1747
1748/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001749 * Function prototypes
1750 */
1751
1752/*
1753 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -07001754 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001755 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001756# define NORET_TYPE /**/
1757# define ATTRIB_NORET __attribute__((noreturn))
1758# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001759
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001760/* bitmap.c */
1761extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1762
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001763/* balloc.c */
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001764extern unsigned int ext4_block_group(struct super_block *sb,
1765 ext4_fsblk_t blocknr);
1766extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1767 ext4_fsblk_t blocknr);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001768extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1769extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1770 ext4_group_t group);
Aneesh Kumar K.V7061eba2008-07-11 19:27:31 -04001771extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
Allison Henderson55f020d2011-05-25 07:41:26 -04001772 ext4_fsblk_t goal,
1773 unsigned int flags,
1774 unsigned long *count,
1775 int *errp);
Theodore Ts'oe7d5f312011-09-09 19:14:51 -04001776extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1777 s64 nclusters, unsigned int flags);
Theodore Ts'o5dee5432011-09-09 19:10:51 -04001778extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001779extern void ext4_check_blocks_bitmap(struct super_block *);
Mingming Cao617ba132006-10-11 01:20:53 -07001780extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001781 ext4_group_t block_group,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001782 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -07001783extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001784struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1785 ext4_group_t block_group);
Theodore Ts'ofd034a82011-09-09 18:42:51 -04001786extern void ext4_init_block_bitmap(struct super_block *sb,
1787 struct buffer_head *bh,
1788 ext4_group_t group,
1789 struct ext4_group_desc *desc);
Theodore Ts'ocff1dfd2011-09-09 19:12:51 -04001790extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1791 ext4_group_t block_group,
1792 struct ext4_group_desc *gdp);
Theodore Ts'od5b8f312011-09-09 18:44:51 -04001793extern unsigned ext4_num_base_meta_clusters(struct super_block *sb,
1794 ext4_group_t block_group);
1795extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1796 ext4_group_t block_group,
1797 struct ext4_group_desc *gdp);
Eric Sandeenf86186b2011-06-28 10:01:31 -04001798ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001799
1800/* dir.c */
Theodore Ts'o60fd4da2010-07-27 11:54:40 -04001801extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
Theodore Ts'of7c21172011-01-10 12:10:55 -05001802 struct file *,
Theodore Ts'o60fd4da2010-07-27 11:54:40 -04001803 struct ext4_dir_entry_2 *,
1804 struct buffer_head *, unsigned int);
Theodore Ts'of7c21172011-01-10 12:10:55 -05001805#define ext4_check_dir_entry(dir, filp, de, bh, offset) \
1806 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1807 (de), (bh), (offset)))
Mingming Cao617ba132006-10-11 01:20:53 -07001808extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001809 __u32 minor_hash,
Mingming Cao617ba132006-10-11 01:20:53 -07001810 struct ext4_dir_entry_2 *dirent);
1811extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001812
1813/* fsync.c */
Josef Bacik02c24a82011-07-16 20:44:56 -04001814extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
Jiaying Zhang3889fd52011-01-10 12:47:05 -05001815extern int ext4_flush_completed_IO(struct inode *);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001816
1817/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001818extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001819 dx_hash_info *hinfo);
1820
1821/* ialloc.c */
Theodore Ts'of157a4a2009-06-13 11:09:42 -04001822extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
Dmitry Monakhov5cb81da2011-10-29 09:05:00 -04001823 const struct qstr *qstr, __u32 goal,
1824 uid_t *owner);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001825extern void ext4_free_inode(handle_t *, struct inode *);
1826extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1827extern unsigned long ext4_count_free_inodes(struct super_block *);
1828extern unsigned long ext4_count_dirs(struct super_block *);
1829extern void ext4_check_inodes_bitmap(struct super_block *);
Theodore Ts'o61d08672010-10-27 21:30:15 -04001830extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
Lukas Czernerbfff6872010-10-27 21:30:05 -04001831extern int ext4_init_inode_table(struct super_block *sb,
1832 ext4_group_t group, int barrier);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001833
Alex Tomasc9de5602008-01-29 00:19:52 -05001834/* mballoc.c */
1835extern long ext4_mb_stats;
1836extern long ext4_mb_max_to_scan;
1837extern int ext4_mb_init(struct super_block *, int);
1838extern int ext4_mb_release(struct super_block *);
1839extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1840 struct ext4_allocation_request *, int *);
1841extern int ext4_mb_reserve_blocks(struct super_block *, int);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04001842extern void ext4_discard_preallocations(struct inode *);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04001843extern int __init ext4_init_mballoc(void);
1844extern void ext4_exit_mballoc(void);
Theodore Ts'o44338712009-11-22 07:44:56 -05001845extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'oe6362602009-11-23 07:17:05 -05001846 struct buffer_head *bh, ext4_fsblk_t block,
1847 unsigned long count, int flags);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05001848extern int ext4_mb_add_groupinfo(struct super_block *sb,
Frederic Bohe5f21b0e2008-07-11 19:27:31 -04001849 ext4_group_t i, struct ext4_group_desc *desc);
Yongqiang Yangcc7365d2011-07-26 21:46:07 -04001850extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
Amir Goldstein2846e822011-05-09 10:46:41 -04001851 ext4_fsblk_t block, unsigned long count);
Lukas Czerner7360d172010-10-27 21:30:12 -04001852extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1853
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001854/* inode.c */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001855struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1856 ext4_lblk_t, int, int *);
1857struct buffer_head *ext4_bread(handle_t *, struct inode *,
1858 ext4_lblk_t, int, int *);
Eric Sandeen6873fa02008-10-07 00:46:36 -04001859int ext4_get_block(struct inode *inode, sector_t iblock,
1860 struct buffer_head *bh_result, int create);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001861
David Howells1d1fe1e2008-02-07 00:15:37 -08001862extern struct inode *ext4_iget(struct super_block *, unsigned long);
Christoph Hellwiga9185b42010-03-05 09:21:37 +01001863extern int ext4_write_inode(struct inode *, struct writeback_control *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001864extern int ext4_setattr(struct dentry *, struct iattr *);
Mingming Cao3e3398a2008-07-11 19:27:31 -04001865extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1866 struct kstat *stat);
Al Viro0930fcc2010-06-07 13:16:22 -04001867extern void ext4_evict_inode(struct inode *);
1868extern void ext4_clear_inode(struct inode *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001869extern int ext4_sync_inode(handle_t *, struct inode *);
Christoph Hellwigaa385722011-05-27 06:53:02 -04001870extern void ext4_dirty_inode(struct inode *, int);
Mingming Cao617ba132006-10-11 01:20:53 -07001871extern int ext4_change_inode_journal_flag(struct inode *, int);
1872extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
Duane Griffin91ef4ca2008-07-11 19:27:31 -04001873extern int ext4_can_truncate(struct inode *inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001874extern void ext4_truncate(struct inode *);
Allison Hendersona4bb6b62011-05-25 07:41:50 -04001875extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
Jan Kara487caee2009-08-17 22:17:20 -04001876extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
Mingming Cao617ba132006-10-11 01:20:53 -07001877extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -04001878extern void ext4_get_inode_flags(struct ext4_inode_info *);
Theodore Ts'occd25062009-02-26 01:04:07 -05001879extern int ext4_alloc_da_blocks(struct inode *inode);
Mingming Cao617ba132006-10-11 01:20:53 -07001880extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07001881extern int ext4_writepage_trans_blocks(struct inode *);
Mingming Caof3bd1f32008-08-19 22:16:03 -04001882extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
Jan Karacf108bc2008-07-11 19:27:31 -04001883extern int ext4_block_truncate_page(handle_t *handle,
Alex Tomasa86c6182006-10-11 01:21:03 -07001884 struct address_space *mapping, loff_t from);
Allison Henderson30848852011-05-25 07:41:32 -04001885extern int ext4_block_zero_page_range(handle_t *handle,
1886 struct address_space *mapping, loff_t from, loff_t length);
Allison Henderson4e96b2d2011-09-03 11:51:09 -04001887extern int ext4_discard_partial_page_buffers(handle_t *handle,
1888 struct address_space *mapping, loff_t from,
1889 loff_t length, int flags);
1890extern int ext4_discard_partial_page_buffers_no_lock(handle_t *handle,
1891 struct inode *inode, struct page *page, loff_t from,
1892 loff_t length, int flags);
Nick Pigginc2ec1752009-03-31 15:23:21 -07001893extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
Dmitry Monakhova9e7f442009-12-14 15:21:14 +03001894extern qsize_t *ext4_get_reserved_space(struct inode *inode);
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05001895extern void ext4_da_update_reserve_space(struct inode *inode,
1896 int used, int quota_claim);
Amir Goldsteindae1e522011-06-27 19:40:50 -04001897
1898/* indirect.c */
1899extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
1900 struct ext4_map_blocks *map, int flags);
1901extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
1902 const struct iovec *iov, loff_t offset,
1903 unsigned long nr_segs);
1904extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
1905extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
Amir Goldsteinff9893d2011-06-27 16:36:31 -04001906extern void ext4_ind_truncate(struct inode *inode);
1907
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001908/* ioctl.c */
Andi Kleen5cdd7b22008-04-29 22:03:54 -04001909extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001910extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001911
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05001912/* migrate.c */
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -04001913extern int ext4_ext_migrate(struct inode *);
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001914
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001915/* namei.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001916extern int ext4_orphan_add(handle_t *, struct inode *);
1917extern int ext4_orphan_del(handle_t *, struct inode *);
1918extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001919 __u32 start_minor_hash, __u32 *next_hash);
1920
1921/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001922extern int ext4_group_add(struct super_block *sb,
1923 struct ext4_new_group_data *input);
1924extern int ext4_group_extend(struct super_block *sb,
1925 struct ext4_super_block *es,
1926 ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001927
1928/* super.c */
Theodore Ts'o9933fc02011-08-01 08:45:02 -04001929extern void *ext4_kvmalloc(size_t size, gfp_t flags);
1930extern void *ext4_kvzalloc(size_t size, gfp_t flags);
1931extern void ext4_kvfree(void *ptr);
Joe Perchesb9075fa2011-10-31 17:11:33 -07001932extern __printf(4, 5)
1933void __ext4_error(struct super_block *, const char *, unsigned int,
1934 const char *, ...);
Theodore Ts'oc398eda2010-07-27 11:56:40 -04001935#define ext4_error(sb, message...) __ext4_error(sb, __func__, \
1936 __LINE__, ## message)
Joe Perchesb9075fa2011-10-31 17:11:33 -07001937extern __printf(5, 6)
1938void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
1939 const char *, ...);
1940extern __printf(5, 6)
1941void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
1942 const char *, ...);
Theodore Ts'oc398eda2010-07-27 11:56:40 -04001943extern void __ext4_std_error(struct super_block *, const char *,
1944 unsigned int, int);
Joe Perchesb9075fa2011-10-31 17:11:33 -07001945extern __printf(4, 5)
1946void __ext4_abort(struct super_block *, const char *, unsigned int,
1947 const char *, ...);
Theodore Ts'oc67d8592010-06-29 11:07:07 -04001948#define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
Theodore Ts'oc398eda2010-07-27 11:56:40 -04001949 __LINE__, ## message)
Joe Perchesb9075fa2011-10-31 17:11:33 -07001950extern __printf(4, 5)
1951void __ext4_warning(struct super_block *, const char *, unsigned int,
1952 const char *, ...);
Theodore Ts'oc398eda2010-07-27 11:56:40 -04001953#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
1954 __LINE__, ## message)
Joe Perchesb9075fa2011-10-31 17:11:33 -07001955extern __printf(3, 4)
1956void ext4_msg(struct super_block *, const char *, const char *, ...);
Johann Lombardic5e06d12011-05-24 18:31:25 -04001957extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
1958 const char *, unsigned int, const char *);
1959#define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
1960 __LINE__, msg)
Joe Perchesb9075fa2011-10-31 17:11:33 -07001961extern __printf(7, 8)
1962void __ext4_grp_locked_error(const char *, unsigned int,
1963 struct super_block *, ext4_group_t,
1964 unsigned long, ext4_fsblk_t,
1965 const char *, ...);
Theodore Ts'oe29136f2010-06-29 12:54:28 -04001966#define ext4_grp_locked_error(sb, grp, message...) \
1967 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001968extern void ext4_update_dynamic_rev(struct super_block *sb);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -05001969extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1970 __u32 compat);
1971extern int ext4_update_rocompat_feature(handle_t *handle,
1972 struct super_block *sb, __u32 rocompat);
1973extern int ext4_update_incompat_feature(handle_t *handle,
1974 struct super_block *sb, __u32 incompat);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001975extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1976 struct ext4_group_desc *bg);
1977extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1978 struct ext4_group_desc *bg);
1979extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1980 struct ext4_group_desc *bg);
Theodore Ts'o021b65b2011-09-09 19:08:51 -04001981extern __u32 ext4_free_group_clusters(struct super_block *sb,
1982 struct ext4_group_desc *bg);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001983extern __u32 ext4_free_inodes_count(struct super_block *sb,
1984 struct ext4_group_desc *bg);
1985extern __u32 ext4_used_dirs_count(struct super_block *sb,
1986 struct ext4_group_desc *bg);
1987extern __u32 ext4_itable_unused_count(struct super_block *sb,
1988 struct ext4_group_desc *bg);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001989extern void ext4_block_bitmap_set(struct super_block *sb,
1990 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1991extern void ext4_inode_bitmap_set(struct super_block *sb,
1992 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1993extern void ext4_inode_table_set(struct super_block *sb,
1994 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Theodore Ts'o021b65b2011-09-09 19:08:51 -04001995extern void ext4_free_group_clusters_set(struct super_block *sb,
1996 struct ext4_group_desc *bg,
1997 __u32 count);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001998extern void ext4_free_inodes_set(struct super_block *sb,
1999 struct ext4_group_desc *bg, __u32 count);
2000extern void ext4_used_dirs_set(struct super_block *sb,
2001 struct ext4_group_desc *bg, __u32 count);
2002extern void ext4_itable_unused_set(struct super_block *sb,
2003 struct ext4_group_desc *bg, __u32 count);
Theodore Ts'obb23c202009-05-01 19:44:44 -04002004extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
2005 struct ext4_group_desc *gdp);
2006extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
2007 struct ext4_group_desc *gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002008
2009static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2010{
2011 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04002012 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002013}
2014
2015static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2016{
2017 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002018 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002019}
2020
2021static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2022{
2023 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002024 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002025}
2026
2027static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2028 ext4_fsblk_t blk)
2029{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04002030 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002031 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2032}
2033
2034static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2035 ext4_fsblk_t blk)
2036{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002037 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002038 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2039}
2040
2041static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2042 ext4_fsblk_t blk)
2043{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04002044 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002045 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2046}
2047
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002048static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2049{
Theodore Ts'o06a279d2009-01-17 18:41:37 -05002050 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2051 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2052 le32_to_cpu(raw_inode->i_size_lo);
2053 else
2054 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002055}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002056
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05002057static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2058{
2059 raw_inode->i_size_lo = cpu_to_le32(i_size);
2060 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2061}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002062
Alex Tomasc9de5602008-01-29 00:19:52 -05002063static inline
2064struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002065 ext4_group_t group)
Alex Tomasc9de5602008-01-29 00:19:52 -05002066{
2067 struct ext4_group_info ***grp_info;
2068 long indexv, indexh;
2069 grp_info = EXT4_SB(sb)->s_group_info;
2070 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2071 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2072 return grp_info[indexv][indexh];
2073}
2074
Theodore Ts'o8df96752009-05-01 08:50:38 -04002075/*
2076 * Reading s_groups_count requires using smp_rmb() afterwards. See
2077 * the locking protocol documented in the comments of ext4_group_add()
2078 * in resize.c
2079 */
2080static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2081{
2082 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2083
2084 smp_rmb();
2085 return ngroups;
2086}
Alex Tomasc9de5602008-01-29 00:19:52 -05002087
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002088static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2089 ext4_group_t block_group)
2090{
2091 return block_group >> sbi->s_log_groups_per_flex;
2092}
2093
2094static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2095{
2096 return 1 << sbi->s_log_groups_per_flex;
2097}
2098
Mingming Cao617ba132006-10-11 01:20:53 -07002099#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002100do { \
2101 if ((errno)) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -04002102 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002103} while (0)
2104
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04002105#ifdef CONFIG_SMP
Theodore Ts'odf55c992011-09-09 19:16:51 -04002106/* Each CPU can accumulate percpu_counter_batch clusters in their local
2107 * counters. So we need to make sure we have free clusters more
Eric Dumazet179f7eb2009-01-06 14:41:04 -08002108 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04002109 */
Theodore Ts'odf55c992011-09-09 19:16:51 -04002110#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04002111#else
Theodore Ts'odf55c992011-09-09 19:16:51 -04002112#define EXT4_FREECLUSTERS_WATERMARK 0
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04002113#endif
2114
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04002115static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2116{
2117 /*
2118 * XXX: replace with spinlock if seen contended -bzzz
2119 */
2120 down_write(&EXT4_I(inode)->i_data_sem);
2121 if (newsize > EXT4_I(inode)->i_disksize)
2122 EXT4_I(inode)->i_disksize = newsize;
2123 up_write(&EXT4_I(inode)->i_data_sem);
2124 return ;
2125}
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04002126
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002127struct ext4_group_info {
2128 unsigned long bb_state;
2129 struct rb_root bb_free_root;
Eric Sandeena36b4492009-08-25 22:36:45 -04002130 ext4_grpblk_t bb_first_free; /* first free block */
2131 ext4_grpblk_t bb_free; /* total free blocks */
2132 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
Curt Wohlgemuth8a57d9d2010-05-16 15:00:00 -04002133 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002134 struct list_head bb_prealloc_list;
2135#ifdef DOUBLE_CHECK
2136 void *bb_bitmap;
2137#endif
2138 struct rw_semaphore alloc_sem;
Eric Sandeena36b4492009-08-25 22:36:45 -04002139 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2140 * regions, index is order.
2141 * bb_counters[3] = 5 means
2142 * 5 free 8-block regions. */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002143};
2144
Tao Ma3d56b8d2011-07-11 00:03:38 -04002145#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2146#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002147
2148#define EXT4_MB_GRP_NEED_INIT(grp) \
2149 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2150
Tao Ma3d56b8d2011-07-11 00:03:38 -04002151#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2152 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2153#define EXT4_MB_GRP_SET_TRIMMED(grp) \
2154 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2155#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2156 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2157
Theodore Ts'o50797482009-09-18 13:34:02 -04002158#define EXT4_MAX_CONTENTION 8
2159#define EXT4_CONTENTION_THRESHOLD 2
2160
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002161static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2162 ext4_group_t group)
2163{
2164 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2165}
2166
Theodore Ts'o50797482009-09-18 13:34:02 -04002167/*
2168 * Returns true if the filesystem is busy enough that attempts to
2169 * access the block group locks has run into contention.
2170 */
2171static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2172{
2173 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2174}
2175
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002176static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2177{
Theodore Ts'o50797482009-09-18 13:34:02 -04002178 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2179 if (spin_trylock(lock))
2180 /*
2181 * We're able to grab the lock right away, so drop the
2182 * lock contention counter.
2183 */
2184 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2185 else {
2186 /*
2187 * The lock is busy, so bump the contention counter,
2188 * and then wait on the spin lock.
2189 */
2190 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2191 EXT4_MAX_CONTENTION);
2192 spin_lock(lock);
2193 }
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002194}
2195
2196static inline void ext4_unlock_group(struct super_block *sb,
2197 ext4_group_t group)
2198{
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002199 spin_unlock(ext4_group_lock_ptr(sb, group));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002200}
2201
Theodore Ts'oa0375152010-06-11 23:14:04 -04002202static inline void ext4_mark_super_dirty(struct super_block *sb)
2203{
2204 if (EXT4_SB(sb)->s_journal == NULL)
2205 sb->s_dirt =1;
2206}
2207
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002208/*
Theodore Ts'o1f7d1e72011-06-27 19:16:02 -04002209 * Block validity checking
2210 */
2211#define ext4_check_indirect_blockref(inode, bh) \
2212 ext4_check_blockref(__func__, __LINE__, inode, \
2213 (__le32 *)(bh)->b_data, \
2214 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2215
2216#define ext4_ind_check_inode(inode) \
2217 ext4_check_blockref(__func__, __LINE__, inode, \
2218 EXT4_I(inode)->i_data, \
2219 EXT4_NDIR_BLOCKS)
2220
2221/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002222 * Inodes and files operations
2223 */
2224
2225/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07002226extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002227
2228/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002229extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07002230extern const struct file_operations ext4_file_operations;
Toshiyuki Okajimae0d10bf2010-10-27 21:30:06 -04002231extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002232
2233/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002234extern const struct inode_operations ext4_dir_inode_operations;
2235extern const struct inode_operations ext4_special_inode_operations;
Theodore Ts'o596397b2009-05-01 13:49:15 -04002236extern struct dentry *ext4_get_parent(struct dentry *child);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002237
2238/* symlink.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002239extern const struct inode_operations ext4_symlink_inode_operations;
2240extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002241
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04002242/* block_validity */
2243extern void ext4_release_system_zone(struct super_block *sb);
2244extern int ext4_setup_system_zone(struct super_block *sb);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002245extern int __init ext4_init_system_zone(void);
2246extern void ext4_exit_system_zone(void);
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04002247extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2248 ext4_fsblk_t start_blk,
2249 unsigned int count);
Theodore Ts'o1f7d1e72011-06-27 19:16:02 -04002250extern int ext4_check_blockref(const char *, unsigned int,
2251 struct inode *, __le32 *, unsigned int);
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04002252
Alex Tomasa86c6182006-10-11 01:21:03 -07002253/* extents.c */
2254extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2255extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
Mingming Caoa02908f2008-08-19 22:16:07 -04002256extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2257 int chunk);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04002258extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2259 struct ext4_map_blocks *map, int flags);
Jan Karacf108bc2008-07-11 19:27:31 -04002260extern void ext4_ext_truncate(struct inode *);
Allison Hendersona4bb6b62011-05-25 07:41:50 -04002261extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2262 loff_t length);
Alex Tomasa86c6182006-10-11 01:21:03 -07002263extern void ext4_ext_init(struct super_block *);
2264extern void ext4_ext_release(struct super_block *);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002265extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
Amit Aroraa2df2a62007-07-17 21:42:41 -04002266 loff_t len);
Mingming Cao00314622009-09-28 15:49:08 -04002267extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
Eric Sandeena1de02d2010-02-04 23:58:38 -05002268 ssize_t len);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04002269extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2270 struct ext4_map_blocks *map, int flags);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05002271extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2272 __u64 start, __u64 len);
Akira Fujita748de672009-06-17 19:24:03 -04002273/* move_extent.c */
2274extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2275 __u64 start_orig, __u64 start_donor,
2276 __u64 len, __u64 *moved_len);
2277
Theodore Ts'obd2d0212010-10-27 21:30:10 -04002278/* page-io.c */
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04002279extern int __init ext4_init_pageio(void);
2280extern void ext4_exit_pageio(void);
Theodore Ts'of7ad6d22010-11-08 13:43:33 -05002281extern void ext4_ioend_wait(struct inode *);
Theodore Ts'obd2d0212010-10-27 21:30:10 -04002282extern void ext4_free_io_end(ext4_io_end_t *io);
2283extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2284extern int ext4_end_io_nolock(ext4_io_end_t *io);
2285extern void ext4_io_submit(struct ext4_io_submit *io);
2286extern int ext4_bio_write_page(struct ext4_io_submit *io,
2287 struct page *page,
2288 int len,
2289 struct writeback_control *wbc);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05002290
Johann Lombardic5e06d12011-05-24 18:31:25 -04002291/* mmp.c */
2292extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2293
Jiaying Zhang744692d2010-03-04 16:14:02 -05002294/* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2295enum ext4_state_bits {
2296 BH_Uninit /* blocks are allocated but uninitialized on disk */
2297 = BH_JBDPrivateStart,
Aditya Kali7b415bf2011-09-09 19:04:51 -04002298 BH_AllocFromCluster, /* allocated blocks were part of already
2299 * allocated cluster. Note that this flag will
2300 * never, ever appear in a buffer_head's state
2301 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2302 * this is used. */
Aditya Kali5356f262011-09-09 19:20:51 -04002303 BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This
2304 * flag is set when ext4_map_blocks is called on a
2305 * delayed allocated block to get its real mapping. */
Jiaying Zhang744692d2010-03-04 16:14:02 -05002306};
2307
2308BUFFER_FNS(Uninit, uninit)
2309TAS_BUFFER_FNS(Uninit, uninit)
Aditya Kali5356f262011-09-09 19:20:51 -04002310BUFFER_FNS(Da_Mapped, da_mapped)
Jiaying Zhang744692d2010-03-04 16:14:02 -05002311
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05002312/*
2313 * Add new method to test wether block and inode bitmaps are properly
2314 * initialized. With uninit_bg reading the block from disk is not enough
2315 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2316 */
2317#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2318
2319static inline int bitmap_uptodate(struct buffer_head *bh)
2320{
2321 return (buffer_uptodate(bh) &&
2322 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2323}
2324static inline void set_bitmap_uptodate(struct buffer_head *bh)
2325{
2326 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2327}
2328
Akinobu Mita731eb1a2010-03-03 23:55:01 -05002329#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2330
Eric Sandeene9e3bce2011-02-12 08:17:34 -05002331/* For ioend & aio unwritten conversion wait queues */
2332#define EXT4_WQ_HASH_SZ 37
2333#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2334 EXT4_WQ_HASH_SZ])
2335#define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2336 EXT4_WQ_HASH_SZ])
2337extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2338extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2339
Yongqiang Yang8f82f842011-07-26 21:35:44 -04002340#define EXT4_RESIZING 0
2341extern int ext4_resize_begin(struct super_block *sb);
2342extern void ext4_resize_end(struct super_block *sb);
2343
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002344#endif /* __KERNEL__ */
2345
Aditya Kalid8990242011-09-09 19:18:51 -04002346#include "ext4_extents.h"
2347
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002348#endif /* _EXT4_H */