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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c3027eb552
This adds a sequence number to the btrfs inode that is increased on every update. NFS will be able to use that to detect when an inode has changed, without relying on inaccurate time fields. While we're here, this also: Puts reserved space into the super block and inode Adds a log root transid to the super so we can pick the newest super based on the fsync log as well as the main transaction ID. For now the log root transid is always zero, but that'll get fixed. Adds a starting offset to the dev_item. This will let us do better alignment calculations if we know the start of a partition on the disk. 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 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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/* sequence number for NFS changes */
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u64 sequence;
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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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