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marcus.erl |
/*
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* linux/include/linux/ext4_fs_i.h
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/include/linux/minix_fs_i.h
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#ifndef _LINUX_EXT4_FS_I
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#define _LINUX_EXT4_FS_I
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#include <linux/rwsem.h>
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#include <linux/rbtree.h>
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#include <linux/seqlock.h>
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#include <linux/mutex.h>
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/* data type for block offset of block group */
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typedef int ext4_grpblk_t;
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/* data type for filesystem-wide blocks number */
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typedef unsigned long long ext4_fsblk_t;
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struct ext4_reserve_window {
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ext4_fsblk_t _rsv_start; /* First byte reserved */
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ext4_fsblk_t _rsv_end; /* Last byte reserved or 0 */
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};
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struct ext4_reserve_window_node {
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struct rb_node rsv_node;
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__u32 rsv_goal_size;
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__u32 rsv_alloc_hit;
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struct ext4_reserve_window rsv_window;
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};
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struct ext4_block_alloc_info {
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/* information about reservation window */
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struct ext4_reserve_window_node rsv_window_node;
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/*
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* was i_next_alloc_block in ext4_inode_info
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* is the logical (file-relative) number of the
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* most-recently-allocated block in this file.
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* We use this for detecting linearly ascending allocation requests.
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*/
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__u32 last_alloc_logical_block;
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/*
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* Was i_next_alloc_goal in ext4_inode_info
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* is the *physical* companion to i_next_alloc_block.
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* it the physical block number of the block which was most-recentl
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* allocated to this file. This give us the goal (target) for the next
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* allocation when we detect linearly ascending requests.
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*/
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ext4_fsblk_t last_alloc_physical_block;
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};
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#define rsv_start rsv_window._rsv_start
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#define rsv_end rsv_window._rsv_end
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/*
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* storage for cached extent
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*/
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struct ext4_ext_cache {
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ext4_fsblk_t ec_start;
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__u32 ec_block;
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__u32 ec_len; /* must be 32bit to return holes */
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__u32 ec_type;
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};
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/*
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* third extended file system inode data in memory
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*/
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struct ext4_inode_info {
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__le32 i_data[15]; /* unconverted */
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__u32 i_flags;
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ext4_fsblk_t i_file_acl;
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__u32 i_dir_acl;
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__u32 i_dtime;
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/*
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* i_block_group is the number of the block group which contains
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* this file's inode. Constant across the lifetime of the inode,
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* it is ued for making block allocation decisions - we try to
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* place a file's data blocks near its inode block, and new inodes
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* near to their parent directory's inode.
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*/
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__u32 i_block_group;
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__u32 i_state; /* Dynamic state flags for ext4 */
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/* block reservation info */
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struct ext4_block_alloc_info *i_block_alloc_info;
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__u32 i_dir_start_lookup;
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#ifdef CONFIG_EXT4DEV_FS_XATTR
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/*
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* Extended attributes can be read independently of the main file
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* data. Taking i_mutex even when reading would cause contention
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* between readers of EAs and writers of regular file data, so
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* instead we synchronize on xattr_sem when reading or changing
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* EAs.
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*/
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struct rw_semaphore xattr_sem;
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#endif
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#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
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struct posix_acl *i_acl;
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struct posix_acl *i_default_acl;
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#endif
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struct list_head i_orphan; /* unlinked but open inodes */
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/*
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* i_disksize keeps track of what the inode size is ON DISK, not
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* in memory. During truncate, i_size is set to the new size by
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* the VFS prior to calling ext4_truncate(), but the filesystem won't
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* set i_disksize to 0 until the truncate is actually under way.
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*
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* The intent is that i_disksize always represents the blocks which
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* are used by this file. This allows recovery to restart truncate
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* on orphans if we crash during truncate. We actually write i_disksize
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* into the on-disk inode when writing inodes out, instead of i_size.
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*
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* The only time when i_disksize and i_size may be different is when
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* a truncate is in progress. The only things which change i_disksize
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* are ext4_get_block (growth) and ext4_truncate (shrinkth).
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*/
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loff_t i_disksize;
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/* on-disk additional length */
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__u16 i_extra_isize;
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/*
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* truncate_mutex is for serialising ext4_truncate() against
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* ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
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* data tree are chopped off during truncate. We can't do that in
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* ext4 because whenever we perform intermediate commits during
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* truncate, the inode and all the metadata blocks *must* be in a
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* consistent state which allows truncation of the orphans to restart
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* during recovery. Hence we must fix the get_block-vs-truncate race
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* by other means, so we have truncate_mutex.
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*/
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struct mutex truncate_mutex;
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struct inode vfs_inode;
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unsigned long i_ext_generation;
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struct ext4_ext_cache i_cached_extent;
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/*
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* File creation time. Its function is same as that of
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* struct timespec i_{a,c,m}time in the generic inode.
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*/
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struct timespec i_crtime;
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};
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#endif /* _LINUX_EXT4_FS_I */
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