diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ext4/ext4.h')
| -rw-r--r-- | ANDROID_3.4.5/fs/ext4/ext4.h | 2372 |
1 files changed, 0 insertions, 2372 deletions
diff --git a/ANDROID_3.4.5/fs/ext4/ext4.h b/ANDROID_3.4.5/fs/ext4/ext4.h deleted file mode 100644 index 0e01e90a..00000000 --- a/ANDROID_3.4.5/fs/ext4/ext4.h +++ /dev/null @@ -1,2372 +0,0 @@ -/* - * ext4.h - * - * Copyright (C) 1992, 1993, 1994, 1995 - * Remy Card (card@masi.ibp.fr) - * Laboratoire MASI - Institut Blaise Pascal - * Universite Pierre et Marie Curie (Paris VI) - * - * from - * - * linux/include/linux/minix_fs.h - * - * Copyright (C) 1991, 1992 Linus Torvalds - */ - -#ifndef _EXT4_H -#define _EXT4_H - -#include <linux/types.h> -#include <linux/blkdev.h> -#include <linux/magic.h> -#include <linux/jbd2.h> -#include <linux/quota.h> -#include <linux/rwsem.h> -#include <linux/rbtree.h> -#include <linux/seqlock.h> -#include <linux/mutex.h> -#include <linux/timer.h> -#include <linux/wait.h> -#include <linux/blockgroup_lock.h> -#include <linux/percpu_counter.h> -#ifdef __KERNEL__ -#include <linux/compat.h> -#endif - -/* - * The fourth extended filesystem constants/structures - */ - -/* - * Define EXT4FS_DEBUG to produce debug messages - */ -#undef EXT4FS_DEBUG - -/* - * Debug code - */ -#ifdef EXT4FS_DEBUG -#define ext4_debug(f, a...) \ - do { \ - printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ - __FILE__, __LINE__, __func__); \ - printk(KERN_DEBUG f, ## a); \ - } while (0) -#else -#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) -#endif - -#define EXT4_ERROR_INODE(inode, fmt, a...) \ - ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) - -#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ - ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) - -#define EXT4_ERROR_FILE(file, block, fmt, a...) \ - ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) - -/* data type for block offset of block group */ -typedef int ext4_grpblk_t; - -/* data type for filesystem-wide blocks number */ -typedef unsigned long long ext4_fsblk_t; - -/* data type for file logical block number */ -typedef __u32 ext4_lblk_t; - -/* data type for block group number */ -typedef unsigned int ext4_group_t; - -/* - * Flags used in mballoc's allocation_context flags field. - * - * Also used to show what's going on for debugging purposes when the - * flag field is exported via the traceport interface - */ - -/* prefer goal again. length */ -#define EXT4_MB_HINT_MERGE 0x0001 -/* blocks already reserved */ -#define EXT4_MB_HINT_RESERVED 0x0002 -/* metadata is being allocated */ -#define EXT4_MB_HINT_METADATA 0x0004 -/* first blocks in the file */ -#define EXT4_MB_HINT_FIRST 0x0008 -/* search for the best chunk */ -#define EXT4_MB_HINT_BEST 0x0010 -/* data is being allocated */ -#define EXT4_MB_HINT_DATA 0x0020 -/* don't preallocate (for tails) */ -#define EXT4_MB_HINT_NOPREALLOC 0x0040 -/* allocate for locality group */ -#define EXT4_MB_HINT_GROUP_ALLOC 0x0080 -/* allocate goal blocks or none */ -#define EXT4_MB_HINT_GOAL_ONLY 0x0100 -/* goal is meaningful */ -#define EXT4_MB_HINT_TRY_GOAL 0x0200 -/* blocks already pre-reserved by delayed allocation */ -#define EXT4_MB_DELALLOC_RESERVED 0x0400 -/* We are doing stream allocation */ -#define EXT4_MB_STREAM_ALLOC 0x0800 -/* Use reserved root blocks if needed */ -#define EXT4_MB_USE_ROOT_BLOCKS 0x1000 - -struct ext4_allocation_request { - /* target inode for block we're allocating */ - struct inode *inode; - /* how many blocks we want to allocate */ - unsigned int len; - /* logical block in target inode */ - ext4_lblk_t logical; - /* the closest logical allocated block to the left */ - ext4_lblk_t lleft; - /* the closest logical allocated block to the right */ - ext4_lblk_t lright; - /* phys. target (a hint) */ - ext4_fsblk_t goal; - /* phys. block for the closest logical allocated block to the left */ - ext4_fsblk_t pleft; - /* phys. block for the closest logical allocated block to the right */ - ext4_fsblk_t pright; - /* flags. see above EXT4_MB_HINT_* */ - unsigned int flags; -}; - -/* - * Logical to physical block mapping, used by ext4_map_blocks() - * - * This structure is used to pass requests into ext4_map_blocks() as - * well as to store the information returned by ext4_map_blocks(). It - * takes less room on the stack than a struct buffer_head. - */ -#define EXT4_MAP_NEW (1 << BH_New) -#define EXT4_MAP_MAPPED (1 << BH_Mapped) -#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) -#define EXT4_MAP_BOUNDARY (1 << BH_Boundary) -#define EXT4_MAP_UNINIT (1 << BH_Uninit) -/* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of - * ext4_map_blocks wants to know whether or not the underlying cluster has - * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that - * the requested mapping was from previously mapped (or delayed allocated) - * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster - * should never appear on buffer_head's state flags. - */ -#define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) -#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ - EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ - EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) - -struct ext4_map_blocks { - ext4_fsblk_t m_pblk; - ext4_lblk_t m_lblk; - unsigned int m_len; - unsigned int m_flags; -}; - -/* - * For delayed allocation tracking - */ -struct mpage_da_data { - struct inode *inode; - sector_t b_blocknr; /* start block number of extent */ - size_t b_size; /* size of extent */ - unsigned long b_state; /* state of the extent */ - unsigned long first_page, next_page; /* extent of pages */ - struct writeback_control *wbc; - int io_done; - int pages_written; - int retval; -}; - -/* - * Flags for ext4_io_end->flags - */ -#define EXT4_IO_END_UNWRITTEN 0x0001 -#define EXT4_IO_END_ERROR 0x0002 -#define EXT4_IO_END_QUEUED 0x0004 -#define EXT4_IO_END_DIRECT 0x0008 -#define EXT4_IO_END_IN_FSYNC 0x0010 - -struct ext4_io_page { - struct page *p_page; - atomic_t p_count; -}; - -#define MAX_IO_PAGES 128 - -/* - * For converting uninitialized extents on a work queue. - * - * 'page' is only used from the writepage() path; 'pages' is only used for - * buffered writes; they are used to keep page references until conversion - * takes place. For AIO/DIO, neither field is filled in. - */ -typedef struct ext4_io_end { - struct list_head list; /* per-file finished IO list */ - struct inode *inode; /* file being written to */ - unsigned int flag; /* unwritten or not */ - struct page *page; /* for writepage() path */ - loff_t offset; /* offset in the file */ - ssize_t size; /* size of the extent */ - struct work_struct work; /* data work queue */ - struct kiocb *iocb; /* iocb struct for AIO */ - int result; /* error value for AIO */ - int num_io_pages; /* for writepages() */ - struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */ -} ext4_io_end_t; - -struct ext4_io_submit { - int io_op; - struct bio *io_bio; - ext4_io_end_t *io_end; - struct ext4_io_page *io_page; - sector_t io_next_block; -}; - -/* - * Special inodes numbers - */ -#define EXT4_BAD_INO 1 /* Bad blocks inode */ -#define EXT4_ROOT_INO 2 /* Root inode */ -#define EXT4_USR_QUOTA_INO 3 /* User quota inode */ -#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ -#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ -#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ -#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ -#define EXT4_JOURNAL_INO 8 /* Journal inode */ - -/* First non-reserved inode for old ext4 filesystems */ -#define EXT4_GOOD_OLD_FIRST_INO 11 - -/* - * Maximal count of links to a file - */ -#define EXT4_LINK_MAX 65000 - -/* - * Macro-instructions used to manage several block sizes - */ -#define EXT4_MIN_BLOCK_SIZE 1024 -#define EXT4_MAX_BLOCK_SIZE 65536 -#define EXT4_MIN_BLOCK_LOG_SIZE 10 -#define EXT4_MAX_BLOCK_LOG_SIZE 16 -#ifdef __KERNEL__ -# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) -#else -# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) -#endif -#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) -#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ - EXT4_SB(s)->s_cluster_bits) -#ifdef __KERNEL__ -# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) -# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) -#else -# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) -#endif -#ifdef __KERNEL__ -#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) -#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) -#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) -#else -#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ - EXT4_GOOD_OLD_INODE_SIZE : \ - (s)->s_inode_size) -#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ - EXT4_GOOD_OLD_FIRST_INO : \ - (s)->s_first_ino) -#endif -#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) - -/* Translate a block number to a cluster number */ -#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) -/* Translate a cluster number to a block number */ -#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) -/* Translate # of blks to # of clusters */ -#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ - (sbi)->s_cluster_bits) - -/* - * Structure of a blocks group descriptor - */ -struct ext4_group_desc -{ - __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ - __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ - __le32 bg_inode_table_lo; /* Inodes table block */ - __le16 bg_free_blocks_count_lo;/* Free blocks count */ - __le16 bg_free_inodes_count_lo;/* Free inodes count */ - __le16 bg_used_dirs_count_lo; /* Directories count */ - __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ - __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ - __le16 bg_itable_unused_lo; /* Unused inodes count */ - __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ - __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ - __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ - __le32 bg_inode_table_hi; /* Inodes table block MSB */ - __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ - __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ - __le16 bg_used_dirs_count_hi; /* Directories count MSB */ - __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ - __u32 bg_reserved2[3]; -}; - -/* - * Structure of a flex block group info - */ - -struct flex_groups { - atomic_t free_inodes; - atomic_t free_clusters; - atomic_t used_dirs; -}; - -#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ -#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ -#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ - -/* - * Macro-instructions used to manage group descriptors - */ -#define EXT4_MIN_DESC_SIZE 32 -#define EXT4_MIN_DESC_SIZE_64BIT 64 -#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE -#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) -#ifdef __KERNEL__ -# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) -# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) -# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) -# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) -# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) -#else -# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) -# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) -# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) -#endif - -/* - * Constants relative to the data blocks - */ -#define EXT4_NDIR_BLOCKS 12 -#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS -#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) -#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) -#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) - -/* - * Inode flags - */ -#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ -#define EXT4_UNRM_FL 0x00000002 /* Undelete */ -#define EXT4_COMPR_FL 0x00000004 /* Compress file */ -#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ -#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ -#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ -#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ -#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ -/* Reserved for compression usage... */ -#define EXT4_DIRTY_FL 0x00000100 -#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ -#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ -#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ -/* End compression flags --- maybe not all used */ -#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ -#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ -#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ -#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ -#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ -#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ -#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ -#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ -#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ -#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ -#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ - -#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ -#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ - -/* Flags that should be inherited by new inodes from their parent. */ -#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ - EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ - EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ - EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) - -/* Flags that are appropriate for regular files (all but dir-specific ones). */ -#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) - -/* Flags that are appropriate for non-directories/regular files. */ -#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) - -/* Mask out flags that are inappropriate for the given type of inode. */ -static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) -{ - if (S_ISDIR(mode)) - return flags; - else if (S_ISREG(mode)) - return flags & EXT4_REG_FLMASK; - else - return flags & EXT4_OTHER_FLMASK; -} - -/* - * Inode flags used for atomic set/get - */ -enum { - EXT4_INODE_SECRM = 0, /* Secure deletion */ - EXT4_INODE_UNRM = 1, /* Undelete */ - EXT4_INODE_COMPR = 2, /* Compress file */ - EXT4_INODE_SYNC = 3, /* Synchronous updates */ - EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ - EXT4_INODE_APPEND = 5, /* writes to file may only append */ - EXT4_INODE_NODUMP = 6, /* do not dump file */ - EXT4_INODE_NOATIME = 7, /* do not update atime */ -/* Reserved for compression usage... */ - EXT4_INODE_DIRTY = 8, - EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ - EXT4_INODE_NOCOMPR = 10, /* Don't compress */ - EXT4_INODE_ECOMPR = 11, /* Compression error */ -/* End compression flags --- maybe not all used */ - EXT4_INODE_INDEX = 12, /* hash-indexed directory */ - EXT4_INODE_IMAGIC = 13, /* AFS directory */ - EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ - EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ - EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ - EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ - EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ - EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ - EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ - EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ - EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ -}; - -#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) -#define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ - printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ - EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } - -/* - * Since it's pretty easy to mix up bit numbers and hex values, and we - * can't do a compile-time test for ENUM values, we use a run-time - * test to make sure that EXT4_XXX_FL is consistent with respect to - * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop - * out so it won't cost any extra space in the compiled kernel image. - * But it's important that these values are the same, since we are - * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL - * must be consistent with the values of FS_XXX_FL defined in - * include/linux/fs.h and the on-disk values found in ext2, ext3, and - * ext4 filesystems, and of course the values defined in e2fsprogs. - * - * It's not paranoia if the Murphy's Law really *is* out to get you. :-) - */ -static inline void ext4_check_flag_values(void) -{ - CHECK_FLAG_VALUE(SECRM); - CHECK_FLAG_VALUE(UNRM); - CHECK_FLAG_VALUE(COMPR); - CHECK_FLAG_VALUE(SYNC); - CHECK_FLAG_VALUE(IMMUTABLE); - CHECK_FLAG_VALUE(APPEND); - CHECK_FLAG_VALUE(NODUMP); - CHECK_FLAG_VALUE(NOATIME); - CHECK_FLAG_VALUE(DIRTY); - CHECK_FLAG_VALUE(COMPRBLK); - CHECK_FLAG_VALUE(NOCOMPR); - CHECK_FLAG_VALUE(ECOMPR); - CHECK_FLAG_VALUE(INDEX); - CHECK_FLAG_VALUE(IMAGIC); - CHECK_FLAG_VALUE(JOURNAL_DATA); - CHECK_FLAG_VALUE(NOTAIL); - CHECK_FLAG_VALUE(DIRSYNC); - CHECK_FLAG_VALUE(TOPDIR); - CHECK_FLAG_VALUE(HUGE_FILE); - CHECK_FLAG_VALUE(EXTENTS); - CHECK_FLAG_VALUE(EA_INODE); - CHECK_FLAG_VALUE(EOFBLOCKS); - CHECK_FLAG_VALUE(RESERVED); -} - -/* Used to pass group descriptor data when online resize is done */ -struct ext4_new_group_input { - __u32 group; /* Group number for this data */ - __u64 block_bitmap; /* Absolute block number of block bitmap */ - __u64 inode_bitmap; /* Absolute block number of inode bitmap */ - __u64 inode_table; /* Absolute block number of inode table start */ - __u32 blocks_count; /* Total number of blocks in this group */ - __u16 reserved_blocks; /* Number of reserved blocks in this group */ - __u16 unused; -}; - -#if defined(__KERNEL__) && defined(CONFIG_COMPAT) -struct compat_ext4_new_group_input { - u32 group; - compat_u64 block_bitmap; - compat_u64 inode_bitmap; - compat_u64 inode_table; - u32 blocks_count; - u16 reserved_blocks; - u16 unused; -}; -#endif - -/* The struct ext4_new_group_input in kernel space, with free_blocks_count */ -struct ext4_new_group_data { - __u32 group; - __u64 block_bitmap; - __u64 inode_bitmap; - __u64 inode_table; - __u32 blocks_count; - __u16 reserved_blocks; - __u16 unused; - __u32 free_blocks_count; -}; - -/* Indexes used to index group tables in ext4_new_group_data */ -enum { - BLOCK_BITMAP = 0, /* block bitmap */ - INODE_BITMAP, /* inode bitmap */ - INODE_TABLE, /* inode tables */ - GROUP_TABLE_COUNT, -}; - -/* - * Flags used by ext4_map_blocks() - */ - /* Allocate any needed blocks and/or convert an unitialized - extent to be an initialized ext4 */ -#define EXT4_GET_BLOCKS_CREATE 0x0001 - /* Request the creation of an unitialized extent */ -#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 -#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ - EXT4_GET_BLOCKS_CREATE) - /* Caller is from the delayed allocation writeout path, - so set the magic i_delalloc_reserve_flag after taking the - inode allocation semaphore for */ -#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 - /* caller is from the direct IO path, request to creation of an - unitialized extents if not allocated, split the uninitialized - extent if blocks has been preallocated already*/ -#define EXT4_GET_BLOCKS_PRE_IO 0x0008 -#define EXT4_GET_BLOCKS_CONVERT 0x0010 -#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ - EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) - /* Convert extent to initialized after IO complete */ -#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ - EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) - /* Punch out blocks of an extent */ -#define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 - /* Don't normalize allocation size (used for fallocate) */ -#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 - /* Request will not result in inode size update (user for fallocate) */ -#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 - -/* - * Flags used by ext4_free_blocks - */ -#define EXT4_FREE_BLOCKS_METADATA 0x0001 -#define EXT4_FREE_BLOCKS_FORGET 0x0002 -#define EXT4_FREE_BLOCKS_VALIDATED 0x0004 -#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 -#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 -#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 - -/* - * Flags used by ext4_discard_partial_page_buffers - */ -#define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 - -/* - * ioctl commands - */ -#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS -#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS -#define EXT4_IOC_GETVERSION _IOR('f', 3, long) -#define EXT4_IOC_SETVERSION _IOW('f', 4, long) -#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION -#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION -#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) -#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) -#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) -#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) -#define EXT4_IOC_MIGRATE _IO('f', 9) - /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ - /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ -#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) -#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) -#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) - -#if defined(__KERNEL__) && defined(CONFIG_COMPAT) -/* - * ioctl commands in 32 bit emulation - */ -#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS -#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS -#define EXT4_IOC32_GETVERSION _IOR('f', 3, int) -#define EXT4_IOC32_SETVERSION _IOW('f', 4, int) -#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) -#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) -#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) -#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) -#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION -#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION -#endif - -/* Max physical block we can address w/o extents */ -#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF - -/* - * Structure of an inode on the disk - */ -struct ext4_inode { - __le16 i_mode; /* File mode */ - __le16 i_uid; /* Low 16 bits of Owner Uid */ - __le32 i_size_lo; /* Size in bytes */ - __le32 i_atime; /* Access time */ - __le32 i_ctime; /* Inode Change time */ - __le32 i_mtime; /* Modification time */ - __le32 i_dtime; /* Deletion Time */ - __le16 i_gid; /* Low 16 bits of Group Id */ - __le16 i_links_count; /* Links count */ - __le32 i_blocks_lo; /* Blocks count */ - __le32 i_flags; /* File flags */ - union { - struct { - __le32 l_i_version; - } linux1; - struct { - __u32 h_i_translator; - } hurd1; - struct { - __u32 m_i_reserved1; - } masix1; - } osd1; /* OS dependent 1 */ - __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ - __le32 i_generation; /* File version (for NFS) */ - __le32 i_file_acl_lo; /* File ACL */ - __le32 i_size_high; - __le32 i_obso_faddr; /* Obsoleted fragment address */ - union { - struct { - __le16 l_i_blocks_high; /* were l_i_reserved1 */ - __le16 l_i_file_acl_high; - __le16 l_i_uid_high; /* these 2 fields */ - __le16 l_i_gid_high; /* were reserved2[0] */ - __u32 l_i_reserved2; - } linux2; - struct { - __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ - __u16 h_i_mode_high; - __u16 h_i_uid_high; - __u16 h_i_gid_high; - __u32 h_i_author; - } hurd2; - struct { - __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ - __le16 m_i_file_acl_high; - __u32 m_i_reserved2[2]; - } masix2; - } osd2; /* OS dependent 2 */ - __le16 i_extra_isize; - __le16 i_pad1; - __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ - __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ - __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ - __le32 i_crtime; /* File Creation time */ - __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ - __le32 i_version_hi; /* high 32 bits for 64-bit version */ -}; - -struct move_extent { - __u32 reserved; /* should be zero */ - __u32 donor_fd; /* donor file descriptor */ - __u64 orig_start; /* logical start offset in block for orig */ - __u64 donor_start; /* logical start offset in block for donor */ - __u64 len; /* block length to be moved */ - __u64 moved_len; /* moved block length */ -}; - -#define EXT4_EPOCH_BITS 2 -#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) -#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) - -/* - * Extended fields will fit into an inode if the filesystem was formatted - * with large inodes (-I 256 or larger) and there are not currently any EAs - * consuming all of the available space. For new inodes we always reserve - * enough space for the kernel's known extended fields, but for inodes - * created with an old kernel this might not have been the case. None of - * the extended inode fields is critical for correct filesystem operation. - * This macro checks if a certain field fits in the inode. Note that - * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize - */ -#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ - ((offsetof(typeof(*ext4_inode), field) + \ - sizeof((ext4_inode)->field)) \ - <= (EXT4_GOOD_OLD_INODE_SIZE + \ - (einode)->i_extra_isize)) \ - -static inline __le32 ext4_encode_extra_time(struct timespec *time) -{ - return cpu_to_le32((sizeof(time->tv_sec) > 4 ? - (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | - ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); -} - -static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) -{ - if (sizeof(time->tv_sec) > 4) - time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) - << 32; - time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; -} - -#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ -do { \ - (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ - if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ - (raw_inode)->xtime ## _extra = \ - ext4_encode_extra_time(&(inode)->xtime); \ -} while (0) - -#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ -do { \ - if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ - (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ - if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ - (raw_inode)->xtime ## _extra = \ - ext4_encode_extra_time(&(einode)->xtime); \ -} while (0) - -#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ -do { \ - (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ - if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ - ext4_decode_extra_time(&(inode)->xtime, \ - raw_inode->xtime ## _extra); \ - else \ - (inode)->xtime.tv_nsec = 0; \ -} while (0) - -#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ -do { \ - if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ - (einode)->xtime.tv_sec = \ - (signed)le32_to_cpu((raw_inode)->xtime); \ - if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ - ext4_decode_extra_time(&(einode)->xtime, \ - raw_inode->xtime ## _extra); \ - else \ - (einode)->xtime.tv_nsec = 0; \ -} while (0) - -#define i_disk_version osd1.linux1.l_i_version - -#if defined(__KERNEL__) || defined(__linux__) -#define i_reserved1 osd1.linux1.l_i_reserved1 -#define i_file_acl_high osd2.linux2.l_i_file_acl_high -#define i_blocks_high osd2.linux2.l_i_blocks_high -#define i_uid_low i_uid -#define i_gid_low i_gid -#define i_uid_high osd2.linux2.l_i_uid_high -#define i_gid_high osd2.linux2.l_i_gid_high -#define i_reserved2 osd2.linux2.l_i_reserved2 - -#elif defined(__GNU__) - -#define i_translator osd1.hurd1.h_i_translator -#define i_uid_high osd2.hurd2.h_i_uid_high -#define i_gid_high osd2.hurd2.h_i_gid_high -#define i_author osd2.hurd2.h_i_author - -#elif defined(__masix__) - -#define i_reserved1 osd1.masix1.m_i_reserved1 -#define i_file_acl_high osd2.masix2.m_i_file_acl_high -#define i_reserved2 osd2.masix2.m_i_reserved2 - -#endif /* defined(__KERNEL__) || defined(__linux__) */ - -/* - * storage for cached extent - * If ec_len == 0, then the cache is invalid. - * If ec_start == 0, then the cache represents a gap (null mapping) - */ -struct ext4_ext_cache { - ext4_fsblk_t ec_start; - ext4_lblk_t ec_block; - __u32 ec_len; /* must be 32bit to return holes */ -}; - -/* - * fourth extended file system inode data in memory - */ -struct ext4_inode_info { - __le32 i_data[15]; /* unconverted */ - __u32 i_dtime; - ext4_fsblk_t i_file_acl; - - /* - * i_block_group is the number of the block group which contains - * this file's inode. Constant across the lifetime of the inode, - * it is ued for making block allocation decisions - we try to - * place a file's data blocks near its inode block, and new inodes - * near to their parent directory's inode. - */ - ext4_group_t i_block_group; - ext4_lblk_t i_dir_start_lookup; -#if (BITS_PER_LONG < 64) - unsigned long i_state_flags; /* Dynamic state flags */ -#endif - unsigned long i_flags; - -#ifdef CONFIG_EXT4_FS_XATTR - /* - * Extended attributes can be read independently of the main file - * data. Taking i_mutex even when reading would cause contention - * between readers of EAs and writers of regular file data, so - * instead we synchronize on xattr_sem when reading or changing - * EAs. - */ - struct rw_semaphore xattr_sem; -#endif - - struct list_head i_orphan; /* unlinked but open inodes */ - - /* - * i_disksize keeps track of what the inode size is ON DISK, not - * in memory. During truncate, i_size is set to the new size by - * the VFS prior to calling ext4_truncate(), but the filesystem won't - * set i_disksize to 0 until the truncate is actually under way. - * - * The intent is that i_disksize always represents the blocks which - * are used by this file. This allows recovery to restart truncate - * on orphans if we crash during truncate. We actually write i_disksize - * into the on-disk inode when writing inodes out, instead of i_size. - * - * The only time when i_disksize and i_size may be different is when - * a truncate is in progress. The only things which change i_disksize - * are ext4_get_block (growth) and ext4_truncate (shrinkth). - */ - loff_t i_disksize; - - /* - * i_data_sem is for serialising ext4_truncate() against - * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's - * data tree are chopped off during truncate. We can't do that in - * ext4 because whenever we perform intermediate commits during - * truncate, the inode and all the metadata blocks *must* be in a - * consistent state which allows truncation of the orphans to restart - * during recovery. Hence we must fix the get_block-vs-truncate race - * by other means, so we have i_data_sem. - */ - struct rw_semaphore i_data_sem; - struct inode vfs_inode; - struct jbd2_inode *jinode; - - struct ext4_ext_cache i_cached_extent; - /* - * File creation time. Its function is same as that of - * struct timespec i_{a,c,m}time in the generic inode. - */ - struct timespec i_crtime; - - /* mballoc */ - struct list_head i_prealloc_list; - spinlock_t i_prealloc_lock; - - /* ialloc */ - ext4_group_t i_last_alloc_group; - - /* allocation reservation info for delalloc */ - /* In case of bigalloc, these refer to clusters rather than blocks */ - unsigned int i_reserved_data_blocks; - unsigned int i_reserved_meta_blocks; - unsigned int i_allocated_meta_blocks; - ext4_lblk_t i_da_metadata_calc_last_lblock; - int i_da_metadata_calc_len; - - /* on-disk additional length */ - __u16 i_extra_isize; - -#ifdef CONFIG_QUOTA - /* quota space reservation, managed internally by quota code */ - qsize_t i_reserved_quota; -#endif - - /* completed IOs that might need unwritten extents handling */ - struct list_head i_completed_io_list; - spinlock_t i_completed_io_lock; - atomic_t i_ioend_count; /* Number of outstanding io_end structs */ - /* current io_end structure for async DIO write*/ - ext4_io_end_t *cur_aio_dio; - atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */ - - spinlock_t i_block_reservation_lock; - - /* - * Transactions that contain inode's metadata needed to complete - * fsync and fdatasync, respectively. - */ - tid_t i_sync_tid; - tid_t i_datasync_tid; -}; - -/* - * File system states - */ -#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ -#define EXT4_ERROR_FS 0x0002 /* Errors detected */ -#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ - -/* - * Misc. filesystem flags - */ -#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ -#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ -#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ - -/* - * Mount flags - */ -#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ -#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ -#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ -#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ -#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ -#define EXT4_MOUNT_ERRORS_MASK 0x00070 -#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ -#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ -#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ -#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ -#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ -#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ -#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ -#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ -#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ -#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ -#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ -#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ -#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ -#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ -#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ -#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ -#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ -#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ -#define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */ -#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ -#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ -#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ -#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ -#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ - -#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly - specified delalloc */ - -#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ - ~EXT4_MOUNT_##opt -#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ - EXT4_MOUNT_##opt -#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ - EXT4_MOUNT_##opt) - -#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ - ~EXT4_MOUNT2_##opt -#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ - EXT4_MOUNT2_##opt -#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ - EXT4_MOUNT2_##opt) - -#define ext4_test_and_set_bit __test_and_set_bit_le -#define ext4_set_bit __set_bit_le -#define ext4_set_bit_atomic ext2_set_bit_atomic -#define ext4_test_and_clear_bit __test_and_clear_bit_le -#define ext4_clear_bit __clear_bit_le -#define ext4_clear_bit_atomic ext2_clear_bit_atomic -#define ext4_test_bit test_bit_le -#define ext4_find_next_zero_bit find_next_zero_bit_le -#define ext4_find_next_bit find_next_bit_le - -extern void ext4_set_bits(void *bm, int cur, int len); - -/* - * Maximal mount counts between two filesystem checks - */ -#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ -#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ - -/* - * Behaviour when detecting errors - */ -#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ -#define EXT4_ERRORS_RO 2 /* Remount fs read-only */ -#define EXT4_ERRORS_PANIC 3 /* Panic */ -#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE - -/* - * Structure of the super block - */ -struct ext4_super_block { -/*00*/ __le32 s_inodes_count; /* Inodes count */ - __le32 s_blocks_count_lo; /* Blocks count */ - __le32 s_r_blocks_count_lo; /* Reserved blocks count */ - __le32 s_free_blocks_count_lo; /* Free blocks count */ -/*10*/ __le32 s_free_inodes_count; /* Free inodes count */ - __le32 s_first_data_block; /* First Data Block */ - __le32 s_log_block_size; /* Block size */ - __le32 s_log_cluster_size; /* Allocation cluster size */ -/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ - __le32 s_clusters_per_group; /* # Clusters per group */ - __le32 s_inodes_per_group; /* # Inodes per group */ - __le32 s_mtime; /* Mount time */ -/*30*/ __le32 s_wtime; /* Write time */ - __le16 s_mnt_count; /* Mount count */ - __le16 s_max_mnt_count; /* Maximal mount count */ - __le16 s_magic; /* Magic signature */ - __le16 s_state; /* File system state */ - __le16 s_errors; /* Behaviour when detecting errors */ - __le16 s_minor_rev_level; /* minor revision level */ -/*40*/ __le32 s_lastcheck; /* time of last check */ - __le32 s_checkinterval; /* max. time between checks */ - __le32 s_creator_os; /* OS */ - __le32 s_rev_level; /* Revision level */ -/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ - __le16 s_def_resgid; /* Default gid for reserved blocks */ - /* - * These fields are for EXT4_DYNAMIC_REV superblocks only. - * - * Note: the difference between the compatible feature set and - * the incompatible feature set is that if there is a bit set - * in the incompatible feature set that the kernel doesn't - * know about, it should refuse to mount the filesystem. - * - * e2fsck's requirements are more strict; if it doesn't know - * about a feature in either the compatible or incompatible - * feature set, it must abort and not try to meddle with - * things it doesn't understand... - */ - __le32 s_first_ino; /* First non-reserved inode */ - __le16 s_inode_size; /* size of inode structure */ - __le16 s_block_group_nr; /* block group # of this superblock */ - __le32 s_feature_compat; /* compatible feature set */ -/*60*/ __le32 s_feature_incompat; /* incompatible feature set */ - __le32 s_feature_ro_compat; /* readonly-compatible feature set */ -/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ -/*78*/ char s_volume_name[16]; /* volume name */ -/*88*/ char s_last_mounted[64]; /* directory where last mounted */ -/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ - /* - * Performance hints. Directory preallocation should only - * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. - */ - __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ - __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ - __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ - /* - * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. - */ -/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ -/*E0*/ __le32 s_journal_inum; /* inode number of journal file */ - __le32 s_journal_dev; /* device number of journal file */ - __le32 s_last_orphan; /* start of list of inodes to delete */ - __le32 s_hash_seed[4]; /* HTREE hash seed */ - __u8 s_def_hash_version; /* Default hash version to use */ - __u8 s_jnl_backup_type; - __le16 s_desc_size; /* size of group descriptor */ -/*100*/ __le32 s_default_mount_opts; - __le32 s_first_meta_bg; /* First metablock block group */ - __le32 s_mkfs_time; /* When the filesystem was created */ - __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ - /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ -/*150*/ __le32 s_blocks_count_hi; /* Blocks count */ - __le32 s_r_blocks_count_hi; /* Reserved blocks count */ - __le32 s_free_blocks_count_hi; /* Free blocks count */ - __le16 s_min_extra_isize; /* All inodes have at least # bytes */ - __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ - __le32 s_flags; /* Miscellaneous flags */ - __le16 s_raid_stride; /* RAID stride */ - __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ - __le64 s_mmp_block; /* Block for multi-mount protection */ - __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ - __u8 s_log_groups_per_flex; /* FLEX_BG group size */ - __u8 s_reserved_char_pad; - __le16 s_reserved_pad; - __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ - __le32 s_snapshot_inum; /* Inode number of active snapshot */ - __le32 s_snapshot_id; /* sequential ID of active snapshot */ - __le64 s_snapshot_r_blocks_count; /* reserved blocks for active - snapshot's future use */ - __le32 s_snapshot_list; /* inode number of the head of the - on-disk snapshot list */ -#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) - __le32 s_error_count; /* number of fs errors */ - __le32 s_first_error_time; /* first time an error happened */ - __le32 s_first_error_ino; /* inode involved in first error */ - __le64 s_first_error_block; /* block involved of first error */ - __u8 s_first_error_func[32]; /* function where the error happened */ - __le32 s_first_error_line; /* line number where error happened */ - __le32 s_last_error_time; /* most recent time of an error */ - __le32 s_last_error_ino; /* inode involved in last error */ - __le32 s_last_error_line; /* line number where error happened */ - __le64 s_last_error_block; /* block involved of last error */ - __u8 s_last_error_func[32]; /* function where the error happened */ -#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) - __u8 s_mount_opts[64]; - __le32 s_usr_quota_inum; /* inode for tracking user quota */ - __le32 s_grp_quota_inum; /* inode for tracking group quota */ - __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ - __le32 s_reserved[109]; /* Padding to the end of the block */ -}; - -#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) - -#ifdef __KERNEL__ - -/* - * run-time mount flags - */ -#define EXT4_MF_MNTDIR_SAMPLED 0x0001 -#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ - -/* - * fourth extended-fs super-block data in memory - */ -struct ext4_sb_info { - unsigned long s_desc_size; /* Size of a group descriptor in bytes */ - unsigned long s_inodes_per_block;/* Number of inodes per block */ - unsigned long s_blocks_per_group;/* Number of blocks in a group */ - unsigned long s_clusters_per_group; /* Number of clusters in a group */ - unsigned long s_inodes_per_group;/* Number of inodes in a group */ - unsigned long s_itb_per_group; /* Number of inode table blocks per group */ - unsigned long s_gdb_count; /* Number of group descriptor blocks */ - unsigned long s_desc_per_block; /* Number of group descriptors per block */ - ext4_group_t s_groups_count; /* Number of groups in the fs */ - ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ - unsigned long s_overhead_last; /* Last calculated overhead */ - unsigned long s_blocks_last; /* Last seen block count */ - unsigned int s_cluster_ratio; /* Number of blocks per cluster */ - unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ - loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ - struct buffer_head * s_sbh; /* Buffer containing the super block */ - struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ - struct buffer_head **s_group_desc; - unsigned int s_mount_opt; - unsigned int s_mount_opt2; - unsigned int s_mount_flags; - unsigned int s_def_mount_opt; - ext4_fsblk_t s_sb_block; - uid_t s_resuid; - gid_t s_resgid; - unsigned short s_mount_state; - unsigned short s_pad; - int s_addr_per_block_bits; - int s_desc_per_block_bits; - int s_inode_size; - int s_first_ino; - unsigned int s_inode_readahead_blks; - unsigned int s_inode_goal; - spinlock_t s_next_gen_lock; - u32 s_next_generation; - u32 s_hash_seed[4]; - int s_def_hash_version; - int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ - struct percpu_counter s_freeclusters_counter; - struct percpu_counter s_freeinodes_counter; - struct percpu_counter s_dirs_counter; - struct percpu_counter s_dirtyclusters_counter; - struct blockgroup_lock *s_blockgroup_lock; - struct proc_dir_entry *s_proc; - struct kobject s_kobj; - struct completion s_kobj_unregister; - - /* Journaling */ - struct journal_s *s_journal; - struct list_head s_orphan; - struct mutex s_orphan_lock; - unsigned long s_resize_flags; /* Flags indicating if there - is a resizer */ - unsigned long s_commit_interval; - u32 s_max_batch_time; - u32 s_min_batch_time; - struct block_device *journal_bdev; -#ifdef CONFIG_QUOTA - char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ - int s_jquota_fmt; /* Format of quota to use */ -#endif - unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ - struct rb_root system_blks; - -#ifdef EXTENTS_STATS - /* ext4 extents stats */ - unsigned long s_ext_min; - unsigned long s_ext_max; - unsigned long s_depth_max; - spinlock_t s_ext_stats_lock; - unsigned long s_ext_blocks; - unsigned long s_ext_extents; -#endif - - /* for buddy allocator */ - struct ext4_group_info ***s_group_info; - struct inode *s_buddy_cache; - spinlock_t s_md_lock; - unsigned short *s_mb_offsets; - unsigned int *s_mb_maxs; - - /* tunables */ - unsigned long s_stripe; - unsigned int s_mb_stream_request; - unsigned int s_mb_max_to_scan; - unsigned int s_mb_min_to_scan; - unsigned int s_mb_stats; - unsigned int s_mb_order2_reqs; - unsigned int s_mb_group_prealloc; - unsigned int s_max_writeback_mb_bump; - /* where last allocation was done - for stream allocation */ - unsigned long s_mb_last_group; - unsigned long s_mb_last_start; - - /* stats for buddy allocator */ - atomic_t s_bal_reqs; /* number of reqs with len > 1 */ - atomic_t s_bal_success; /* we found long enough chunks */ - atomic_t s_bal_allocated; /* in blocks */ - atomic_t s_bal_ex_scanned; /* total extents scanned */ - atomic_t s_bal_goals; /* goal hits */ - atomic_t s_bal_breaks; /* too long searches */ - atomic_t s_bal_2orders; /* 2^order hits */ - spinlock_t s_bal_lock; - unsigned long s_mb_buddies_generated; - unsigned long long s_mb_generation_time; - atomic_t s_mb_lost_chunks; - atomic_t s_mb_preallocated; - atomic_t s_mb_discarded; - atomic_t s_lock_busy; - - /* locality groups */ - struct ext4_locality_group __percpu *s_locality_groups; - - /* for write statistics */ - unsigned long s_sectors_written_start; - u64 s_kbytes_written; - - unsigned int s_log_groups_per_flex; - struct flex_groups *s_flex_groups; - - /* workqueue for dio unwritten */ - struct workqueue_struct *dio_unwritten_wq; - - /* timer for periodic error stats printing */ - struct timer_list s_err_report; - - /* Lazy inode table initialization info */ - struct ext4_li_request *s_li_request; - /* Wait multiplier for lazy initialization thread */ - unsigned int s_li_wait_mult; - - /* Kernel thread for multiple mount protection */ - struct task_struct *s_mmp_tsk; - - /* record the last minlen when FITRIM is called. */ - atomic_t s_last_trim_minblks; -}; - -static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) -{ - return sb->s_fs_info; -} -static inline struct ext4_inode_info *EXT4_I(struct inode *inode) -{ - return container_of(inode, struct ext4_inode_info, vfs_inode); -} - -static inline struct timespec ext4_current_time(struct inode *inode) -{ - return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? - current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; -} - -static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) -{ - return ino == EXT4_ROOT_INO || - ino == EXT4_JOURNAL_INO || - ino == EXT4_RESIZE_INO || - (ino >= EXT4_FIRST_INO(sb) && - ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); -} - -static inline void ext4_set_io_unwritten_flag(struct inode *inode, - struct ext4_io_end *io_end) -{ - if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { - io_end->flag |= EXT4_IO_END_UNWRITTEN; - atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten); - } -} - -/* - * Inode dynamic state flags - */ -enum { - EXT4_STATE_JDATA, /* journaled data exists */ - EXT4_STATE_NEW, /* inode is newly created */ - EXT4_STATE_XATTR, /* has in-inode xattrs */ - EXT4_STATE_NO_EXPAND, /* No space for expansion */ - EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ - EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ - EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ - EXT4_STATE_NEWENTRY, /* File just added to dir */ - EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ -}; - -#define EXT4_INODE_BIT_FNS(name, field, offset) \ -static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ -{ \ - return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ -} \ -static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ -{ \ - set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ -} \ -static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ -{ \ - clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ -} - -EXT4_INODE_BIT_FNS(flag, flags, 0) -#if (BITS_PER_LONG < 64) -EXT4_INODE_BIT_FNS(state, state_flags, 0) - -static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) -{ - (ei)->i_state_flags = 0; -} -#else -EXT4_INODE_BIT_FNS(state, flags, 32) - -static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) -{ - /* We depend on the fact that callers will set i_flags */ -} -#endif -#else -/* Assume that user mode programs are passing in an ext4fs superblock, not - * a kernel struct super_block. This will allow us to call the feature-test - * macros from user land. */ -#define EXT4_SB(sb) (sb) -#endif - -#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime - -/* - * Codes for operating systems - */ -#define EXT4_OS_LINUX 0 -#define EXT4_OS_HURD 1 -#define EXT4_OS_MASIX 2 -#define EXT4_OS_FREEBSD 3 -#define EXT4_OS_LITES 4 - -/* - * Revision levels - */ -#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ -#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ - -#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV -#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV - -#define EXT4_GOOD_OLD_INODE_SIZE 128 - -/* - * Feature set definitions - */ - -#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ - ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) -#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ - ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) -#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ - ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) -#define EXT4_SET_COMPAT_FEATURE(sb,mask) \ - EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) -#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ - EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) -#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ - EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) -#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ - EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) -#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ - EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) -#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ - EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) - -#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 -#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 -#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 -#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 -#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 -#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 - -#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 -#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 -#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 -#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 -#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 -#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 -#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 -#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 -#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 -#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 - -#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 -#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 -#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ -#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ -#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 -#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ -#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 -#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 -#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 -#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ -#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ -#define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ -#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ -#define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */ - -#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR -#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ - EXT4_FEATURE_INCOMPAT_META_BG) -#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ - EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ - EXT4_FEATURE_RO_COMPAT_BTREE_DIR) - -#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR -#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ - EXT4_FEATURE_INCOMPAT_RECOVER| \ - EXT4_FEATURE_INCOMPAT_META_BG) -#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ - EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ - EXT4_FEATURE_RO_COMPAT_BTREE_DIR) - -#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR -#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ - EXT4_FEATURE_INCOMPAT_RECOVER| \ - EXT4_FEATURE_INCOMPAT_META_BG| \ - EXT4_FEATURE_INCOMPAT_EXTENTS| \ - EXT4_FEATURE_INCOMPAT_64BIT| \ - EXT4_FEATURE_INCOMPAT_FLEX_BG| \ - EXT4_FEATURE_INCOMPAT_MMP) -#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ - EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ - EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ - EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ - EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ - EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ - EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ - EXT4_FEATURE_RO_COMPAT_BIGALLOC) - -/* - * Default values for user and/or group using reserved blocks - */ -#define EXT4_DEF_RESUID 0 -#define EXT4_DEF_RESGID 0 - -#define EXT4_DEF_INODE_READAHEAD_BLKS 32 - -/* - * Default mount options - */ -#define EXT4_DEFM_DEBUG 0x0001 -#define EXT4_DEFM_BSDGROUPS 0x0002 -#define EXT4_DEFM_XATTR_USER 0x0004 -#define EXT4_DEFM_ACL 0x0008 -#define EXT4_DEFM_UID16 0x0010 -#define EXT4_DEFM_JMODE 0x0060 -#define EXT4_DEFM_JMODE_DATA 0x0020 -#define EXT4_DEFM_JMODE_ORDERED 0x0040 -#define EXT4_DEFM_JMODE_WBACK 0x0060 -#define EXT4_DEFM_NOBARRIER 0x0100 -#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 -#define EXT4_DEFM_DISCARD 0x0400 -#define EXT4_DEFM_NODELALLOC 0x0800 - -/* - * Default journal batch times - */ -#define EXT4_DEF_MIN_BATCH_TIME 0 -#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ - -/* - * Minimum number of groups in a flexgroup before we separate out - * directories into the first block group of a flexgroup - */ -#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 - -/* - * Structure of a directory entry - */ -#define EXT4_NAME_LEN 255 - -struct ext4_dir_entry { - __le32 inode; /* Inode number */ - __le16 rec_len; /* Directory entry length */ - __le16 name_len; /* Name length */ - char name[EXT4_NAME_LEN]; /* File name */ -}; - -/* - * The new version of the directory entry. Since EXT4 structures are - * stored in intel byte order, and the name_len field could never be - * bigger than 255 chars, it's safe to reclaim the extra byte for the - * file_type field. - */ -struct ext4_dir_entry_2 { - __le32 inode; /* Inode number */ - __le16 rec_len; /* Directory entry length */ - __u8 name_len; /* Name length */ - __u8 file_type; - char name[EXT4_NAME_LEN]; /* File name */ -}; - -/* - * Ext4 directory file types. Only the low 3 bits are used. The - * other bits are reserved for now. - */ -#define EXT4_FT_UNKNOWN 0 -#define EXT4_FT_REG_FILE 1 -#define EXT4_FT_DIR 2 -#define EXT4_FT_CHRDEV 3 -#define EXT4_FT_BLKDEV 4 -#define EXT4_FT_FIFO 5 -#define EXT4_FT_SOCK 6 -#define EXT4_FT_SYMLINK 7 - -#define EXT4_FT_MAX 8 - -/* - * EXT4_DIR_PAD defines the directory entries boundaries - * - * NOTE: It must be a multiple of 4 - */ -#define EXT4_DIR_PAD 4 -#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) -#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ - ~EXT4_DIR_ROUND) -#define EXT4_MAX_REC_LEN ((1<<16)-1) - -/* - * If we ever get support for fs block sizes > page_size, we'll need - * to remove the #if statements in the next two functions... - */ -static inline unsigned int -ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) -{ - unsigned len = le16_to_cpu(dlen); - -#if (PAGE_CACHE_SIZE >= 65536) - if (len == EXT4_MAX_REC_LEN || len == 0) - return blocksize; - return (len & 65532) | ((len & 3) << 16); -#else - return len; -#endif -} - -static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) -{ - if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) - BUG(); -#if (PAGE_CACHE_SIZE >= 65536) - if (len < 65536) - return cpu_to_le16(len); - if (len == blocksize) { - if (blocksize == 65536) - return cpu_to_le16(EXT4_MAX_REC_LEN); - else - return cpu_to_le16(0); - } - return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); -#else - return cpu_to_le16(len); -#endif -} - -/* - * Hash Tree Directory indexing - * (c) Daniel Phillips, 2001 - */ - -#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ - EXT4_FEATURE_COMPAT_DIR_INDEX) && \ - ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) -#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) -#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) - -/* Legal values for the dx_root hash_version field: */ - -#define DX_HASH_LEGACY 0 -#define DX_HASH_HALF_MD4 1 -#define DX_HASH_TEA 2 -#define DX_HASH_LEGACY_UNSIGNED 3 -#define DX_HASH_HALF_MD4_UNSIGNED 4 -#define DX_HASH_TEA_UNSIGNED 5 - -#ifdef __KERNEL__ - -/* hash info structure used by the directory hash */ -struct dx_hash_info -{ - u32 hash; - u32 minor_hash; - int hash_version; - u32 *seed; -}; - - -/* 32 and 64 bit signed EOF for dx directories */ -#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) -#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) - - -/* - * Control parameters used by ext4_htree_next_block - */ -#define HASH_NB_ALWAYS 1 - - -/* - * Describe an inode's exact location on disk and in memory - */ -struct ext4_iloc -{ - struct buffer_head *bh; - unsigned long offset; - ext4_group_t block_group; -}; - -static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) -{ - return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); -} - -/* - * This structure is stuffed into the struct file's private_data field - * for directories. It is where we put information so that we can do - * readdir operations in hash tree order. - */ -struct dir_private_info { - struct rb_root root; - struct rb_node *curr_node; - struct fname *extra_fname; - loff_t last_pos; - __u32 curr_hash; - __u32 curr_minor_hash; - __u32 next_hash; -}; - -/* calculate the first block number of the group */ -static inline ext4_fsblk_t -ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) -{ - return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + - le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); -} - -/* - * Special error return code only used by dx_probe() and its callers. - */ -#define ERR_BAD_DX_DIR -75000 - -void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, - ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); - -/* - * Timeout and state flag for lazy initialization inode thread. - */ -#define EXT4_DEF_LI_WAIT_MULT 10 -#define EXT4_DEF_LI_MAX_START_DELAY 5 -#define EXT4_LAZYINIT_QUIT 0x0001 -#define EXT4_LAZYINIT_RUNNING 0x0002 - -/* - * Lazy inode table initialization info - */ -struct ext4_lazy_init { - unsigned long li_state; - struct list_head li_request_list; - struct mutex li_list_mtx; -}; - -struct ext4_li_request { - struct super_block *lr_super; - struct ext4_sb_info *lr_sbi; - ext4_group_t lr_next_group; - struct list_head lr_request; - unsigned long lr_next_sched; - unsigned long lr_timeout; -}; - -struct ext4_features { - struct kobject f_kobj; - struct completion f_kobj_unregister; -}; - -/* - * This structure will be used for multiple mount protection. It will be - * written into the block number saved in the s_mmp_block field in the - * superblock. Programs that check MMP should assume that if - * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe - * to use the filesystem, regardless of how old the timestamp is. - */ -#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ -#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ -#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ -#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ - -struct mmp_struct { - __le32 mmp_magic; /* Magic number for MMP */ - __le32 mmp_seq; /* Sequence no. updated periodically */ - - /* - * mmp_time, mmp_nodename & mmp_bdevname are only used for information - * purposes and do not affect the correctness of the algorithm - */ - __le64 mmp_time; /* Time last updated */ - char mmp_nodename[64]; /* Node which last updated MMP block */ - char mmp_bdevname[32]; /* Bdev which last updated MMP block */ - - /* - * mmp_check_interval is used to verify if the MMP block has been - * updated on the block device. The value is updated based on the - * maximum time to write the MMP block during an update cycle. - */ - __le16 mmp_check_interval; - - __le16 mmp_pad1; - __le32 mmp_pad2[227]; -}; - -/* arguments passed to the mmp thread */ -struct mmpd_data { - struct buffer_head *bh; /* bh from initial read_mmp_block() */ - struct super_block *sb; /* super block of the fs */ -}; - -/* - * Check interval multiplier - * The MMP block is written every update interval and initially checked every - * update interval x the multiplier (the value is then adapted based on the - * write latency). The reason is that writes can be delayed under load and we - * don't want readers to incorrectly assume that the filesystem is no longer - * in use. - */ -#define EXT4_MMP_CHECK_MULT 2UL - -/* - * Minimum interval for MMP checking in seconds. - */ -#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL - -/* - * Maximum interval for MMP checking in seconds. - */ -#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL - -/* - * Function prototypes - */ - -/* - * Ok, these declarations are also in <linux/kernel.h> but none of the - * ext4 source programs needs to include it so they are duplicated here. - */ -# define NORET_TYPE /**/ -# define ATTRIB_NORET __attribute__((noreturn)) -# define NORET_AND noreturn, - -/* bitmap.c */ -extern unsigned int ext4_count_free(struct buffer_head *, unsigned); - -/* balloc.c */ -extern unsigned int ext4_block_group(struct super_block *sb, - ext4_fsblk_t blocknr); -extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, - ext4_fsblk_t blocknr); -extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); -extern unsigned long ext4_bg_num_gdb(struct super_block *sb, - ext4_group_t group); -extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, - ext4_fsblk_t goal, - unsigned int flags, - unsigned long *count, - int *errp); -extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, - s64 nclusters, unsigned int flags); -extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); -extern void ext4_check_blocks_bitmap(struct super_block *); -extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, - ext4_group_t block_group, - struct buffer_head ** bh); -extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); - -extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, - ext4_group_t block_group); -extern int ext4_wait_block_bitmap(struct super_block *sb, - ext4_group_t block_group, - struct buffer_head *bh); -extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, - ext4_group_t block_group); -extern void ext4_init_block_bitmap(struct super_block *sb, - struct buffer_head *bh, - ext4_group_t group, - struct ext4_group_desc *desc); -extern unsigned ext4_free_clusters_after_init(struct super_block *sb, - ext4_group_t block_group, - struct ext4_group_desc *gdp); -extern unsigned ext4_num_overhead_clusters(struct super_block *sb, - ext4_group_t block_group, - struct ext4_group_desc *gdp); -ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); - -/* dir.c */ -extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, - struct file *, - struct ext4_dir_entry_2 *, - struct buffer_head *, unsigned int); -#define ext4_check_dir_entry(dir, filp, de, bh, offset) \ - unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ - (de), (bh), (offset))) -extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, - __u32 minor_hash, - struct ext4_dir_entry_2 *dirent); -extern void ext4_htree_free_dir_info(struct dir_private_info *p); - -/* fsync.c */ -extern int ext4_sync_file(struct file *, loff_t, loff_t, int); -extern int ext4_flush_completed_IO(struct inode *); - -/* hash.c */ -extern int ext4fs_dirhash(const char *name, int len, struct - dx_hash_info *hinfo); - -/* ialloc.c */ -extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t, - const struct qstr *qstr, __u32 goal, - uid_t *owner); -extern void ext4_free_inode(handle_t *, struct inode *); -extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); -extern unsigned long ext4_count_free_inodes(struct super_block *); -extern unsigned long ext4_count_dirs(struct super_block *); -extern void ext4_check_inodes_bitmap(struct super_block *); -extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); -extern int ext4_init_inode_table(struct super_block *sb, - ext4_group_t group, int barrier); -extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); - -/* mballoc.c */ -extern long ext4_mb_stats; -extern long ext4_mb_max_to_scan; -extern int ext4_mb_init(struct super_block *, int); -extern int ext4_mb_release(struct super_block *); -extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, - struct ext4_allocation_request *, int *); -extern int ext4_mb_reserve_blocks(struct super_block *, int); -extern void ext4_discard_preallocations(struct inode *); -extern int __init ext4_init_mballoc(void); -extern void ext4_exit_mballoc(void); -extern void ext4_free_blocks(handle_t *handle, struct inode *inode, - struct buffer_head *bh, ext4_fsblk_t block, - unsigned long count, int flags); -extern int ext4_mb_add_groupinfo(struct super_block *sb, - ext4_group_t i, struct ext4_group_desc *desc); -extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, - ext4_fsblk_t block, unsigned long count); -extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); - -/* inode.c */ -struct buffer_head *ext4_getblk(handle_t *, struct inode *, - ext4_lblk_t, int, int *); -struct buffer_head *ext4_bread(handle_t *, struct inode *, - ext4_lblk_t, int, int *); -int ext4_get_block(struct inode *inode, sector_t iblock, - struct buffer_head *bh_result, int create); - -extern struct inode *ext4_iget(struct super_block *, unsigned long); -extern int ext4_write_inode(struct inode *, struct writeback_control *); -extern int ext4_setattr(struct dentry *, struct iattr *); -extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, - struct kstat *stat); -extern void ext4_evict_inode(struct inode *); -extern void ext4_clear_inode(struct inode *); -extern int ext4_sync_inode(handle_t *, struct inode *); -extern void ext4_dirty_inode(struct inode *, int); -extern int ext4_change_inode_journal_flag(struct inode *, int); -extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); -extern int ext4_can_truncate(struct inode *inode); -extern void ext4_truncate(struct inode *); -extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); -extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); -extern void ext4_set_inode_flags(struct inode *); -extern void ext4_get_inode_flags(struct ext4_inode_info *); -extern int ext4_alloc_da_blocks(struct inode *inode); -extern void ext4_set_aops(struct inode *inode); -extern int ext4_writepage_trans_blocks(struct inode *); -extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); -extern int ext4_discard_partial_page_buffers(handle_t *handle, - struct address_space *mapping, loff_t from, - loff_t length, int flags); -extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); -extern qsize_t *ext4_get_reserved_space(struct inode *inode); -extern void ext4_da_update_reserve_space(struct inode *inode, - int used, int quota_claim); - -/* indirect.c */ -extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, - struct ext4_map_blocks *map, int flags); -extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, - const struct iovec *iov, loff_t offset, - unsigned long nr_segs); -extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); -extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); -extern void ext4_ind_truncate(struct inode *inode); - -/* ioctl.c */ -extern long ext4_ioctl(struct file *, unsigned int, unsigned long); -extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); - -/* migrate.c */ -extern int ext4_ext_migrate(struct inode *); - -/* namei.c */ -extern int ext4_orphan_add(handle_t *, struct inode *); -extern int ext4_orphan_del(handle_t *, struct inode *); -extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, - __u32 start_minor_hash, __u32 *next_hash); - -/* resize.c */ -extern int ext4_group_add(struct super_block *sb, - struct ext4_new_group_data *input); -extern int ext4_group_extend(struct super_block *sb, - struct ext4_super_block *es, - ext4_fsblk_t n_blocks_count); -extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); - -/* super.c */ -extern void *ext4_kvmalloc(size_t size, gfp_t flags); -extern void *ext4_kvzalloc(size_t size, gfp_t flags); -extern void ext4_kvfree(void *ptr); -extern __printf(4, 5) -void __ext4_error(struct super_block *, const char *, unsigned int, - const char *, ...); -#define ext4_error(sb, message...) __ext4_error(sb, __func__, \ - __LINE__, ## message) -extern __printf(5, 6) -void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, - const char *, ...); -extern __printf(5, 6) -void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, - const char *, ...); -extern void __ext4_std_error(struct super_block *, const char *, - unsigned int, int); -extern __printf(4, 5) -void __ext4_abort(struct super_block *, const char *, unsigned int, - const char *, ...); -#define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ - __LINE__, ## message) -extern __printf(4, 5) -void __ext4_warning(struct super_block *, const char *, unsigned int, - const char *, ...); -#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ - __LINE__, ## message) -extern __printf(3, 4) -void ext4_msg(struct super_block *, const char *, const char *, ...); -extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, - const char *, unsigned int, const char *); -#define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ - __LINE__, msg) -extern __printf(7, 8) -void __ext4_grp_locked_error(const char *, unsigned int, - struct super_block *, ext4_group_t, - unsigned long, ext4_fsblk_t, - const char *, ...); -#define ext4_grp_locked_error(sb, grp, message...) \ - __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) -extern void ext4_update_dynamic_rev(struct super_block *sb); -extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, - __u32 compat); -extern int ext4_update_rocompat_feature(handle_t *handle, - struct super_block *sb, __u32 rocompat); -extern int ext4_update_incompat_feature(handle_t *handle, - struct super_block *sb, __u32 incompat); -extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, - struct ext4_group_desc *bg); -extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, - struct ext4_group_desc *bg); -extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, - struct ext4_group_desc *bg); -extern __u32 ext4_free_group_clusters(struct super_block *sb, - struct ext4_group_desc *bg); -extern __u32 ext4_free_inodes_count(struct super_block *sb, - struct ext4_group_desc *bg); -extern __u32 ext4_used_dirs_count(struct super_block *sb, - struct ext4_group_desc *bg); -extern __u32 ext4_itable_unused_count(struct super_block *sb, - struct ext4_group_desc *bg); -extern void ext4_block_bitmap_set(struct super_block *sb, - struct ext4_group_desc *bg, ext4_fsblk_t blk); -extern void ext4_inode_bitmap_set(struct super_block *sb, - struct ext4_group_desc *bg, ext4_fsblk_t blk); -extern void ext4_inode_table_set(struct super_block *sb, - struct ext4_group_desc *bg, ext4_fsblk_t blk); -extern void ext4_free_group_clusters_set(struct super_block *sb, - struct ext4_group_desc *bg, - __u32 count); -extern void ext4_free_inodes_set(struct super_block *sb, - struct ext4_group_desc *bg, __u32 count); -extern void ext4_used_dirs_set(struct super_block *sb, - struct ext4_group_desc *bg, __u32 count); -extern void ext4_itable_unused_set(struct super_block *sb, - struct ext4_group_desc *bg, __u32 count); -extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, - struct ext4_group_desc *gdp); -extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, - struct ext4_group_desc *gdp); - -static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) -{ - return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | - le32_to_cpu(es->s_blocks_count_lo); -} - -static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) -{ - return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | - le32_to_cpu(es->s_r_blocks_count_lo); -} - -static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) -{ - return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | - le32_to_cpu(es->s_free_blocks_count_lo); -} - -static inline void ext4_blocks_count_set(struct ext4_super_block *es, - ext4_fsblk_t blk) -{ - es->s_blocks_count_lo = cpu_to_le32((u32)blk); - es->s_blocks_count_hi = cpu_to_le32(blk >> 32); -} - -static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, - ext4_fsblk_t blk) -{ - es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); - es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); -} - -static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, - ext4_fsblk_t blk) -{ - es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); - es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); -} - -static inline loff_t ext4_isize(struct ext4_inode *raw_inode) -{ - if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) - return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | - le32_to_cpu(raw_inode->i_size_lo); - else - return (loff_t) le32_to_cpu(raw_inode->i_size_lo); -} - -static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) -{ - raw_inode->i_size_lo = cpu_to_le32(i_size); - raw_inode->i_size_high = cpu_to_le32(i_size >> 32); -} - -static inline -struct ext4_group_info *ext4_get_group_info(struct super_block *sb, - ext4_group_t group) -{ - struct ext4_group_info ***grp_info; - long indexv, indexh; - grp_info = EXT4_SB(sb)->s_group_info; - indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); - indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); - return grp_info[indexv][indexh]; -} - -/* - * Reading s_groups_count requires using smp_rmb() afterwards. See - * the locking protocol documented in the comments of ext4_group_add() - * in resize.c - */ -static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) -{ - ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; - - smp_rmb(); - return ngroups; -} - -static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, - ext4_group_t block_group) -{ - return block_group >> sbi->s_log_groups_per_flex; -} - -static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) -{ - return 1 << sbi->s_log_groups_per_flex; -} - -#define ext4_std_error(sb, errno) \ -do { \ - if ((errno)) \ - __ext4_std_error((sb), __func__, __LINE__, (errno)); \ -} while (0) - -#ifdef CONFIG_SMP -/* Each CPU can accumulate percpu_counter_batch clusters in their local - * counters. So we need to make sure we have free clusters more - * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. - */ -#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) -#else -#define EXT4_FREECLUSTERS_WATERMARK 0 -#endif - -static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) -{ - /* - * XXX: replace with spinlock if seen contended -bzzz - */ - down_write(&EXT4_I(inode)->i_data_sem); - if (newsize > EXT4_I(inode)->i_disksize) - EXT4_I(inode)->i_disksize = newsize; - up_write(&EXT4_I(inode)->i_data_sem); - return ; -} - -struct ext4_group_info { - unsigned long bb_state; - struct rb_root bb_free_root; - ext4_grpblk_t bb_first_free; /* first free block */ - ext4_grpblk_t bb_free; /* total free blocks */ - ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ - ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ - struct list_head bb_prealloc_list; -#ifdef DOUBLE_CHECK - void *bb_bitmap; -#endif - struct rw_semaphore alloc_sem; - ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block - * regions, index is order. - * bb_counters[3] = 5 means - * 5 free 8-block regions. */ -}; - -#define EXT4_GROUP_INFO_NEED_INIT_BIT 0 -#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 - -#define EXT4_MB_GRP_NEED_INIT(grp) \ - (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) - -#define EXT4_MB_GRP_WAS_TRIMMED(grp) \ - (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) -#define EXT4_MB_GRP_SET_TRIMMED(grp) \ - (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) -#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ - (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) - -#define EXT4_MAX_CONTENTION 8 -#define EXT4_CONTENTION_THRESHOLD 2 - -static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, - ext4_group_t group) -{ - return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); -} - -/* - * Returns true if the filesystem is busy enough that attempts to - * access the block group locks has run into contention. - */ -static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) -{ - return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); -} - -static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) -{ - spinlock_t *lock = ext4_group_lock_ptr(sb, group); - if (spin_trylock(lock)) - /* - * We're able to grab the lock right away, so drop the - * lock contention counter. - */ - atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); - else { - /* - * The lock is busy, so bump the contention counter, - * and then wait on the spin lock. - */ - atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, - EXT4_MAX_CONTENTION); - spin_lock(lock); - } -} - -static inline void ext4_unlock_group(struct super_block *sb, - ext4_group_t group) -{ - spin_unlock(ext4_group_lock_ptr(sb, group)); -} - -static inline void ext4_mark_super_dirty(struct super_block *sb) -{ - if (EXT4_SB(sb)->s_journal == NULL) - sb->s_dirt =1; -} - -/* - * Block validity checking - */ -#define ext4_check_indirect_blockref(inode, bh) \ - ext4_check_blockref(__func__, __LINE__, inode, \ - (__le32 *)(bh)->b_data, \ - EXT4_ADDR_PER_BLOCK((inode)->i_sb)) - -#define ext4_ind_check_inode(inode) \ - ext4_check_blockref(__func__, __LINE__, inode, \ - EXT4_I(inode)->i_data, \ - EXT4_NDIR_BLOCKS) - -/* - * Inodes and files operations - */ - -/* dir.c */ -extern const struct file_operations ext4_dir_operations; - -/* file.c */ -extern const struct inode_operations ext4_file_inode_operations; -extern const struct file_operations ext4_file_operations; -extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); - -/* namei.c */ -extern const struct inode_operations ext4_dir_inode_operations; -extern const struct inode_operations ext4_special_inode_operations; -extern struct dentry *ext4_get_parent(struct dentry *child); - -/* symlink.c */ -extern const struct inode_operations ext4_symlink_inode_operations; -extern const struct inode_operations ext4_fast_symlink_inode_operations; - -/* block_validity */ -extern void ext4_release_system_zone(struct super_block *sb); -extern int ext4_setup_system_zone(struct super_block *sb); -extern int __init ext4_init_system_zone(void); -extern void ext4_exit_system_zone(void); -extern int ext4_data_block_valid(struct ext4_sb_info *sbi, - ext4_fsblk_t start_blk, - unsigned int count); -extern int ext4_check_blockref(const char *, unsigned int, - struct inode *, __le32 *, unsigned int); - -/* extents.c */ -extern int ext4_ext_tree_init(handle_t *handle, struct inode *); -extern int ext4_ext_writepage_trans_blocks(struct inode *, int); -extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, - int chunk); -extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, - struct ext4_map_blocks *map, int flags); -extern void ext4_ext_truncate(struct inode *); -extern int ext4_ext_punch_hole(struct file *file, loff_t offset, - loff_t length); -extern void ext4_ext_init(struct super_block *); -extern void ext4_ext_release(struct super_block *); -extern long ext4_fallocate(struct file *file, int mode, loff_t offset, - loff_t len); -extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, - ssize_t len); -extern int ext4_map_blocks(handle_t *handle, struct inode *inode, - struct ext4_map_blocks *map, int flags); -extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, - __u64 start, __u64 len); -/* move_extent.c */ -extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, - __u64 start_orig, __u64 start_donor, - __u64 len, __u64 *moved_len); - -/* page-io.c */ -extern int __init ext4_init_pageio(void); -extern void ext4_exit_pageio(void); -extern void ext4_ioend_wait(struct inode *); -extern void ext4_free_io_end(ext4_io_end_t *io); -extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); -extern int ext4_end_io_nolock(ext4_io_end_t *io); -extern void ext4_io_submit(struct ext4_io_submit *io); -extern int ext4_bio_write_page(struct ext4_io_submit *io, - struct page *page, - int len, - struct writeback_control *wbc); - -/* mmp.c */ -extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); - -/* BH_Uninit flag: blocks are allocated but uninitialized on disk */ -enum ext4_state_bits { - BH_Uninit /* blocks are allocated but uninitialized on disk */ - = BH_JBDPrivateStart, - BH_AllocFromCluster, /* allocated blocks were part of already - * allocated cluster. Note that this flag will - * never, ever appear in a buffer_head's state - * flag. See EXT4_MAP_FROM_CLUSTER to see where - * this is used. */ - BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This - * flag is set when ext4_map_blocks is called on a - * delayed allocated block to get its real mapping. */ -}; - -BUFFER_FNS(Uninit, uninit) -TAS_BUFFER_FNS(Uninit, uninit) -BUFFER_FNS(Da_Mapped, da_mapped) - -/* - * Add new method to test wether block and inode bitmaps are properly - * initialized. With uninit_bg reading the block from disk is not enough - * to mark the bitmap uptodate. We need to also zero-out the bitmap - */ -#define BH_BITMAP_UPTODATE BH_JBDPrivateStart - -static inline int bitmap_uptodate(struct buffer_head *bh) -{ - return (buffer_uptodate(bh) && - test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); -} -static inline void set_bitmap_uptodate(struct buffer_head *bh) -{ - set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); -} - -#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) - -/* For ioend & aio unwritten conversion wait queues */ -#define EXT4_WQ_HASH_SZ 37 -#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ - EXT4_WQ_HASH_SZ]) -#define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ - EXT4_WQ_HASH_SZ]) -extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; -extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; - -#define EXT4_RESIZING 0 -extern int ext4_resize_begin(struct super_block *sb); -extern void ext4_resize_end(struct super_block *sb); - -#endif /* __KERNEL__ */ - -#include "ext4_extents.h" - -#endif /* _EXT4_H */ |