![Josef Bacik](/assets/img/avatar_default.png)
I removed this in an earlier commit and I was wrong. Because compression can return from filemap_fdatawrite() without having actually set any of it's pages as writeback() it can make filemap_fdatawait() do essentially nothing, and then we won't find any ordered extents because they may not have been created yet. So not only does this make fsync() completely useless, but it will also screw up if you truncate on a non-page aligned offset since we zero out the end and then wait on ordered extents and then call drop caches. We can drop the cache before the io completes and then we try to unpin the extent we just wrote we won't find it and everything goes sideways. So fix this by putting it back and put a giant comment there to keep me from trying to remove it in the future. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com>
217 lines
5.7 KiB
C
217 lines
5.7 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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#include "delayed-inode.h"
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/*
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* ordered_data_close is set by truncate when a file that used
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* to have good data has been truncated to zero. When it is set
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* the btrfs file release call will add this inode to the
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* ordered operations list so that we make sure to flush out any
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* new data the application may have written before commit.
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*/
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#define BTRFS_INODE_ORDERED_DATA_CLOSE 0
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#define BTRFS_INODE_ORPHAN_META_RESERVED 1
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#define BTRFS_INODE_DUMMY 2
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#define BTRFS_INODE_IN_DEFRAG 3
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#define BTRFS_INODE_DELALLOC_META_RESERVED 4
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#define BTRFS_INODE_HAS_ORPHAN_ITEM 5
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#define BTRFS_INODE_HAS_ASYNC_EXTENT 6
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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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/* 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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/* Lock for counters */
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spinlock_t lock;
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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 logging the inode in tree-log.c */
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struct mutex log_mutex;
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/* held while doing delalloc reservations */
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struct mutex delalloc_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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/* 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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/*
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* list for tracking inodes that must be sent to disk before a
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* rename or truncate commit
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*/
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struct list_head ordered_operations;
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/* node for the red-black tree that links inodes in subvolume root */
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struct rb_node rb_node;
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/* the space_info for where this inode's data allocations are done */
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struct btrfs_space_info *space_info;
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unsigned long runtime_flags;
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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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* log transid when this inode was last modified
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*/
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u64 last_sub_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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/* 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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/*
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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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/* the fsync log has some corner cases that mean we have to check
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* directories to see if any unlinks have been done before
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* the directory was logged. See tree-log.c for all the
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* details
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*/
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u64 last_unlink_trans;
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/*
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* Number of bytes outstanding that are going to need csums. This is
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* used in ENOSPC accounting.
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*/
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u64 csum_bytes;
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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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* Counters to keep track of the number of extent item's we may use due
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* to delalloc and such. outstanding_extents is the number of extent
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* items we think we'll end up using, and reserved_extents is the number
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* of extent items we've reserved metadata for.
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*/
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unsigned outstanding_extents;
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unsigned reserved_extents;
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/*
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* always compress this one file
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*/
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unsigned force_compress;
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struct btrfs_delayed_node *delayed_node;
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struct inode vfs_inode;
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};
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extern unsigned char btrfs_filetype_table[];
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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 u64 btrfs_ino(struct inode *inode)
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{
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u64 ino = BTRFS_I(inode)->location.objectid;
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/*
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* !ino: btree_inode
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* type == BTRFS_ROOT_ITEM_KEY: subvol dir
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*/
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if (!ino || BTRFS_I(inode)->location.type == BTRFS_ROOT_ITEM_KEY)
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ino = inode->i_ino;
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return ino;
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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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i_size_write(inode, size);
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BTRFS_I(inode)->disk_i_size = size;
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}
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static inline bool btrfs_is_free_space_inode(struct btrfs_root *root,
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struct inode *inode)
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{
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if (root == root->fs_info->tree_root ||
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BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID)
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return true;
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return false;
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}
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static inline int btrfs_inode_in_log(struct inode *inode, u64 generation)
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{
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struct btrfs_root *root = BTRFS_I(inode)->root;
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int ret = 0;
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mutex_lock(&root->log_mutex);
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if (BTRFS_I(inode)->logged_trans == generation &&
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BTRFS_I(inode)->last_sub_trans <= root->last_log_commit)
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ret = 1;
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mutex_unlock(&root->log_mutex);
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return ret;
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}
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#endif
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