forked from Minki/linux
d352ac6814
This improves the comments at the top of many functions. It didn't dive into the guts of functions because I was trying to avoid merging problems with the new allocator and back reference work. extent-tree.c and volumes.c were both skipped, and there is definitely more work todo in cleaning and commenting the code. Signed-off-by: Chris Mason <chris.mason@oracle.com>
134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS_I__
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#define __BTRFS_I__
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#include "extent_map.h"
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#include "extent_io.h"
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#include "ordered-data.h"
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/* in memory btrfs inode */
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struct btrfs_inode {
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/* which subvolume this inode belongs to */
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struct btrfs_root *root;
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/* the block group preferred for allocations. This pointer is buggy
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* and needs to be replaced with a bytenr instead
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*/
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struct btrfs_block_group_cache *block_group;
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/* key used to find this inode on disk. This is used by the code
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* to read in roots of subvolumes
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*/
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struct btrfs_key location;
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/* the extent_tree has caches of all the extent mappings to disk */
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struct extent_map_tree extent_tree;
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/* the io_tree does range state (DIRTY, LOCKED etc) */
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struct extent_io_tree io_tree;
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/* special utility tree used to record which mirrors have already been
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* tried when checksums fail for a given block
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*/
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struct extent_io_tree io_failure_tree;
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/* held while inserting checksums to avoid races */
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struct mutex csum_mutex;
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/* held while inesrting or deleting extents from files */
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struct mutex extent_mutex;
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/* held while logging the inode in tree-log.c */
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struct mutex log_mutex;
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/* used to order data wrt metadata */
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struct btrfs_ordered_inode_tree ordered_tree;
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/* standard acl pointers */
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struct posix_acl *i_acl;
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struct posix_acl *i_default_acl;
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/* for keeping track of orphaned inodes */
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struct list_head i_orphan;
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/* list of all the delalloc inodes in the FS. There are times we need
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* to write all the delalloc pages to disk, and this list is used
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* to walk them all.
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*/
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struct list_head delalloc_inodes;
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/* full 64 bit generation number, struct vfs_inode doesn't have a big
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* enough field for this.
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*/
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u64 generation;
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/*
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* transid of the trans_handle that last modified this inode
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*/
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u64 last_trans;
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/*
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* transid that last logged this inode
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*/
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u64 logged_trans;
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/*
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* trans that last made a change that should be fully fsync'd. This
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* gets reset to zero each time the inode is logged
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*/
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u64 log_dirty_trans;
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/* total number of bytes pending delalloc, used by stat to calc the
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* real block usage of the file
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*/
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u64 delalloc_bytes;
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/*
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* the size of the file stored in the metadata on disk. data=ordered
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* means the in-memory i_size might be larger than the size on disk
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* because not all the blocks are written yet.
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*/
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u64 disk_i_size;
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/* flags field from the on disk inode */
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u32 flags;
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/*
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* if this is a directory then index_cnt is the counter for the index
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* number for new files that are created
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*/
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u64 index_cnt;
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struct inode vfs_inode;
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};
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static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
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{
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return container_of(inode, struct btrfs_inode, vfs_inode);
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}
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static inline void btrfs_i_size_write(struct inode *inode, u64 size)
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{
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inode->i_size = size;
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BTRFS_I(inode)->disk_i_size = size;
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}
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#endif
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