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* Copyright (C) 2007 Oracle. All rights reserved.
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* General Public License for more details.
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
#ifndef __BTRFS_I__
#define __BTRFS_I__
#include "extent_map.h"
#include "extent_io.h"
#include "ordered-data.h"
/* in memory btrfs inode */
struct btrfs_inode {
/* which subvolume this inode belongs to */
struct btrfs_root *root;
/* key used to find this inode on disk. This is used by the code
* to read in roots of subvolumes
struct btrfs_key location;
/* the extent_tree has caches of all the extent mappings to disk */
struct extent_map_tree extent_tree;
/* the io_tree does range state (DIRTY, LOCKED etc) */
struct extent_io_tree io_tree;
/* special utility tree used to record which mirrors have already been
* tried when checksums fail for a given block
struct extent_io_tree io_failure_tree;
/* held while inesrting or deleting extents from files */
struct mutex extent_mutex;
/* held while logging the inode in tree-log.c */
struct mutex log_mutex;
/* used to order data wrt metadata */
struct btrfs_ordered_inode_tree ordered_tree;
/* for keeping track of orphaned inodes */
struct list_head i_orphan;
/* list of all the delalloc inodes in the FS. There are times we need
* to write all the delalloc pages to disk, and this list is used
* to walk them all.
struct list_head delalloc_inodes;
* list for tracking inodes that must be sent to disk before a
* rename or truncate commit
struct list_head ordered_operations;
/* node for the red-black tree that links inodes in subvolume root */
struct rb_node rb_node;
/* the space_info for where this inode's data allocations are done */
struct btrfs_space_info *space_info;
/* full 64 bit generation number, struct vfs_inode doesn't have a big
* enough field for this.
u64 generation;
/* sequence number for NFS changes */
u64 sequence;
* transid of the trans_handle that last modified this inode
u64 last_trans;
* log transid when this inode was last modified
u64 last_sub_trans;
* transid that last logged this inode
u64 logged_trans;
/* total number of bytes pending delalloc, used by stat to calc the
* real block usage of the file
u64 delalloc_bytes;
/* total number of bytes that may be used for this inode for
* delalloc
u64 reserved_bytes;
* the size of the file stored in the metadata on disk. data=ordered
* means the in-memory i_size might be larger than the size on disk
* because not all the blocks are written yet.
u64 disk_i_size;
/* flags field from the on disk inode */
u32 flags;
* if this is a directory then index_cnt is the counter for the index
* number for new files that are created
u64 index_cnt;
/* the start of block group preferred for allocations. */
u64 block_group;
/* the fsync log has some corner cases that mean we have to check
* directories to see if any unlinks have been done before
* the directory was logged. See tree-log.c for all the
* details
u64 last_unlink_trans;
* Counters to keep track of the number of extent item's we may use due
* to delalloc and such. outstanding_extents is the number of extent
* items we think we'll end up using, and reserved_extents is the number
* of extent items we've reserved metadata for.
spinlock_t accounting_lock;
int reserved_extents;
int outstanding_extents;
* ordered_data_close is set by truncate when a file that used
* to have good data has been truncated to zero. When it is set
* the btrfs file release call will add this inode to the
* ordered operations list so that we make sure to flush out any
* new data the application may have written before commit.
* yes, its silly to have a single bitflag, but we might grow more
* of these.
unsigned ordered_data_close:1;
unsigned dummy_inode:1;
struct inode vfs_inode;
static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
return container_of(inode, struct btrfs_inode, vfs_inode);
static inline void btrfs_i_size_write(struct inode *inode, u64 size)
inode->i_size = size;
BTRFS_I(inode)->disk_i_size = size;