/* * ext4_i.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_i.h * * Copyright (C) 1991, 1992 Linus Torvalds */ #ifndef _EXT4_I #define _EXT4_I #include <linux/rwsem.h> #include <linux/rbtree.h> #include <linux/seqlock.h> #include <linux/mutex.h> /* 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 long ext4_group_t; #define rsv_start rsv_window._rsv_start #define rsv_end rsv_window._rsv_end /* * storage for cached extent */ struct ext4_ext_cache { ext4_fsblk_t ec_start; ext4_lblk_t ec_block; __u32 ec_len; /* must be 32bit to return holes */ __u32 ec_type; }; /* * fourth extended file system inode data in memory */ struct ext4_inode_info { __le32 i_data[15]; /* unconverted */ __u32 i_flags; ext4_fsblk_t i_file_acl; __u32 i_dtime; /* * 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; __u32 i_state; /* Dynamic state flags for ext4 */ ext4_lblk_t i_dir_start_lookup; #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 #ifdef CONFIG_EXT4_FS_POSIX_ACL struct posix_acl *i_acl; struct posix_acl *i_default_acl; #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; /* on-disk additional length */ __u16 i_extra_isize; /* * 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; unsigned long i_ext_generation; 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; /* allocation reservation info for delalloc */ unsigned long i_reserved_data_blocks; unsigned long i_reserved_meta_blocks; unsigned long i_allocated_meta_blocks; unsigned short i_delalloc_reserved_flag; spinlock_t i_block_reservation_lock; }; #endif /* _EXT4_I */