1 /* 2 * ext4_i.h 3 * 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_i.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_I 17 #define _EXT4_I 18 19 #include <linux/rwsem.h> 20 #include <linux/rbtree.h> 21 #include <linux/seqlock.h> 22 #include <linux/mutex.h> 23 24 /* data type for block offset of block group */ 25 typedef int ext4_grpblk_t; 26 27 /* data type for filesystem-wide blocks number */ 28 typedef unsigned long long ext4_fsblk_t; 29 30 /* data type for file logical block number */ 31 typedef __u32 ext4_lblk_t; 32 33 /* data type for block group number */ 34 typedef unsigned int ext4_group_t; 35 36 #define rsv_start rsv_window._rsv_start 37 #define rsv_end rsv_window._rsv_end 38 39 /* 40 * storage for cached extent 41 */ 42 struct ext4_ext_cache { 43 ext4_fsblk_t ec_start; 44 ext4_lblk_t ec_block; 45 __u32 ec_len; /* must be 32bit to return holes */ 46 __u32 ec_type; 47 }; 48 49 /* 50 * fourth extended file system inode data in memory 51 */ 52 struct ext4_inode_info { 53 __le32 i_data[15]; /* unconverted */ 54 __u32 i_flags; 55 ext4_fsblk_t i_file_acl; 56 __u32 i_dtime; 57 58 /* 59 * i_block_group is the number of the block group which contains 60 * this file's inode. Constant across the lifetime of the inode, 61 * it is ued for making block allocation decisions - we try to 62 * place a file's data blocks near its inode block, and new inodes 63 * near to their parent directory's inode. 64 */ 65 ext4_group_t i_block_group; 66 __u32 i_state; /* Dynamic state flags for ext4 */ 67 68 ext4_lblk_t i_dir_start_lookup; 69 #ifdef CONFIG_EXT4_FS_XATTR 70 /* 71 * Extended attributes can be read independently of the main file 72 * data. Taking i_mutex even when reading would cause contention 73 * between readers of EAs and writers of regular file data, so 74 * instead we synchronize on xattr_sem when reading or changing 75 * EAs. 76 */ 77 struct rw_semaphore xattr_sem; 78 #endif 79 #ifdef CONFIG_EXT4_FS_POSIX_ACL 80 struct posix_acl *i_acl; 81 struct posix_acl *i_default_acl; 82 #endif 83 84 struct list_head i_orphan; /* unlinked but open inodes */ 85 86 /* 87 * i_disksize keeps track of what the inode size is ON DISK, not 88 * in memory. During truncate, i_size is set to the new size by 89 * the VFS prior to calling ext4_truncate(), but the filesystem won't 90 * set i_disksize to 0 until the truncate is actually under way. 91 * 92 * The intent is that i_disksize always represents the blocks which 93 * are used by this file. This allows recovery to restart truncate 94 * on orphans if we crash during truncate. We actually write i_disksize 95 * into the on-disk inode when writing inodes out, instead of i_size. 96 * 97 * The only time when i_disksize and i_size may be different is when 98 * a truncate is in progress. The only things which change i_disksize 99 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 100 */ 101 loff_t i_disksize; 102 103 /* 104 * i_data_sem is for serialising ext4_truncate() against 105 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 106 * data tree are chopped off during truncate. We can't do that in 107 * ext4 because whenever we perform intermediate commits during 108 * truncate, the inode and all the metadata blocks *must* be in a 109 * consistent state which allows truncation of the orphans to restart 110 * during recovery. Hence we must fix the get_block-vs-truncate race 111 * by other means, so we have i_data_sem. 112 */ 113 struct rw_semaphore i_data_sem; 114 struct inode vfs_inode; 115 struct jbd2_inode jinode; 116 117 struct ext4_ext_cache i_cached_extent; 118 /* 119 * File creation time. Its function is same as that of 120 * struct timespec i_{a,c,m}time in the generic inode. 121 */ 122 struct timespec i_crtime; 123 124 /* mballoc */ 125 struct list_head i_prealloc_list; 126 spinlock_t i_prealloc_lock; 127 128 /* allocation reservation info for delalloc */ 129 unsigned int i_reserved_data_blocks; 130 unsigned int i_reserved_meta_blocks; 131 unsigned int i_allocated_meta_blocks; 132 unsigned short i_delalloc_reserved_flag; 133 134 /* on-disk additional length */ 135 __u16 i_extra_isize; 136 137 spinlock_t i_block_reservation_lock; 138 }; 139 140 #endif /* _EXT4_I */ 141