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![Josef Bacik](/assets/img/avatar_default.png)
This provides basic DIO support for reading and writing. It does not do the work to recover from mismatching checksums, that will come later. A few design changes have been made from Jim's code (sorry Jim!) 1) Use the generic direct-io code. Jim originally re-wrote all the generic DIO code in order to account for all of BTRFS's oddities, but thanks to that work it seems like the best bet is to just ignore compression and such and just opt to fallback on buffered IO. 2) Fallback on buffered IO for compressed or inline extents. Jim's code did it's own buffering to make dio with compressed extents work. Now we just fallback onto normal buffered IO. 3) Use ordered extents for the writes so that all of the lock_extent() lookup_ordered() type checks continue to work. 4) Do the lock_extent() lookup_ordered() loop in readpage so we don't race with DIO writes. I've tested this with fsx and everything works great. This patch depends on my dio and filemap.c patches to work. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
898 lines
23 KiB
C
898 lines
23 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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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/writeback.h>
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#include <linux/pagevec.h>
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#include "ctree.h"
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#include "transaction.h"
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#include "btrfs_inode.h"
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#include "extent_io.h"
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static u64 entry_end(struct btrfs_ordered_extent *entry)
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{
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if (entry->file_offset + entry->len < entry->file_offset)
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return (u64)-1;
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return entry->file_offset + entry->len;
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}
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/* returns NULL if the insertion worked, or it returns the node it did find
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* in the tree
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*/
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static struct rb_node *tree_insert(struct rb_root *root, u64 file_offset,
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struct rb_node *node)
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{
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struct rb_node **p = &root->rb_node;
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struct rb_node *parent = NULL;
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struct btrfs_ordered_extent *entry;
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while (*p) {
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parent = *p;
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entry = rb_entry(parent, struct btrfs_ordered_extent, rb_node);
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if (file_offset < entry->file_offset)
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p = &(*p)->rb_left;
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else if (file_offset >= entry_end(entry))
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p = &(*p)->rb_right;
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else
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return parent;
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}
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rb_link_node(node, parent, p);
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rb_insert_color(node, root);
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return NULL;
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}
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/*
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* look for a given offset in the tree, and if it can't be found return the
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* first lesser offset
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*/
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static struct rb_node *__tree_search(struct rb_root *root, u64 file_offset,
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struct rb_node **prev_ret)
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{
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struct rb_node *n = root->rb_node;
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struct rb_node *prev = NULL;
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struct rb_node *test;
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struct btrfs_ordered_extent *entry;
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struct btrfs_ordered_extent *prev_entry = NULL;
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while (n) {
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entry = rb_entry(n, struct btrfs_ordered_extent, rb_node);
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prev = n;
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prev_entry = entry;
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if (file_offset < entry->file_offset)
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n = n->rb_left;
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else if (file_offset >= entry_end(entry))
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n = n->rb_right;
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else
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return n;
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}
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if (!prev_ret)
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return NULL;
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while (prev && file_offset >= entry_end(prev_entry)) {
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test = rb_next(prev);
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if (!test)
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break;
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prev_entry = rb_entry(test, struct btrfs_ordered_extent,
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rb_node);
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if (file_offset < entry_end(prev_entry))
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break;
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prev = test;
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}
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if (prev)
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prev_entry = rb_entry(prev, struct btrfs_ordered_extent,
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rb_node);
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while (prev && file_offset < entry_end(prev_entry)) {
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test = rb_prev(prev);
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if (!test)
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break;
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prev_entry = rb_entry(test, struct btrfs_ordered_extent,
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rb_node);
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prev = test;
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}
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*prev_ret = prev;
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return NULL;
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}
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/*
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* helper to check if a given offset is inside a given entry
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*/
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static int offset_in_entry(struct btrfs_ordered_extent *entry, u64 file_offset)
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{
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if (file_offset < entry->file_offset ||
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entry->file_offset + entry->len <= file_offset)
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return 0;
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return 1;
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}
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static int range_overlaps(struct btrfs_ordered_extent *entry, u64 file_offset,
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u64 len)
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{
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if (file_offset + len <= entry->file_offset ||
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entry->file_offset + entry->len <= file_offset)
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return 0;
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return 1;
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}
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/*
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* look find the first ordered struct that has this offset, otherwise
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* the first one less than this offset
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*/
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static inline struct rb_node *tree_search(struct btrfs_ordered_inode_tree *tree,
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u64 file_offset)
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{
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struct rb_root *root = &tree->tree;
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struct rb_node *prev;
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struct rb_node *ret;
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struct btrfs_ordered_extent *entry;
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if (tree->last) {
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entry = rb_entry(tree->last, struct btrfs_ordered_extent,
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rb_node);
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if (offset_in_entry(entry, file_offset))
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return tree->last;
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}
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ret = __tree_search(root, file_offset, &prev);
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if (!ret)
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ret = prev;
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if (ret)
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tree->last = ret;
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return ret;
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}
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/* allocate and add a new ordered_extent into the per-inode tree.
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* file_offset is the logical offset in the file
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*
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* start is the disk block number of an extent already reserved in the
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* extent allocation tree
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*
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* len is the length of the extent
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*
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* The tree is given a single reference on the ordered extent that was
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* inserted.
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*/
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static int __btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
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u64 start, u64 len, u64 disk_len,
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int type, int dio)
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{
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struct btrfs_ordered_inode_tree *tree;
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struct rb_node *node;
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struct btrfs_ordered_extent *entry;
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tree = &BTRFS_I(inode)->ordered_tree;
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entry = kzalloc(sizeof(*entry), GFP_NOFS);
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if (!entry)
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return -ENOMEM;
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entry->file_offset = file_offset;
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entry->start = start;
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entry->len = len;
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entry->disk_len = disk_len;
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entry->bytes_left = len;
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entry->inode = inode;
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if (type != BTRFS_ORDERED_IO_DONE && type != BTRFS_ORDERED_COMPLETE)
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set_bit(type, &entry->flags);
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if (dio)
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set_bit(BTRFS_ORDERED_DIRECT, &entry->flags);
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/* one ref for the tree */
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atomic_set(&entry->refs, 1);
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init_waitqueue_head(&entry->wait);
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INIT_LIST_HEAD(&entry->list);
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INIT_LIST_HEAD(&entry->root_extent_list);
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spin_lock(&tree->lock);
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node = tree_insert(&tree->tree, file_offset,
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&entry->rb_node);
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BUG_ON(node);
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spin_unlock(&tree->lock);
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spin_lock(&BTRFS_I(inode)->root->fs_info->ordered_extent_lock);
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list_add_tail(&entry->root_extent_list,
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&BTRFS_I(inode)->root->fs_info->ordered_extents);
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spin_unlock(&BTRFS_I(inode)->root->fs_info->ordered_extent_lock);
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BUG_ON(node);
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return 0;
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}
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int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
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u64 start, u64 len, u64 disk_len, int type)
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{
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return __btrfs_add_ordered_extent(inode, file_offset, start, len,
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disk_len, type, 0);
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}
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int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
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u64 start, u64 len, u64 disk_len, int type)
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{
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return __btrfs_add_ordered_extent(inode, file_offset, start, len,
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disk_len, type, 1);
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}
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/*
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* Add a struct btrfs_ordered_sum into the list of checksums to be inserted
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* when an ordered extent is finished. If the list covers more than one
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* ordered extent, it is split across multiples.
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*/
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int btrfs_add_ordered_sum(struct inode *inode,
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struct btrfs_ordered_extent *entry,
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struct btrfs_ordered_sum *sum)
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{
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struct btrfs_ordered_inode_tree *tree;
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tree = &BTRFS_I(inode)->ordered_tree;
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spin_lock(&tree->lock);
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list_add_tail(&sum->list, &entry->list);
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spin_unlock(&tree->lock);
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return 0;
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}
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/*
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* this is used to account for finished IO across a given range
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* of the file. The IO should not span ordered extents. If
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* a given ordered_extent is completely done, 1 is returned, otherwise
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* 0.
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*
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* test_and_set_bit on a flag in the struct btrfs_ordered_extent is used
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* to make sure this function only returns 1 once for a given ordered extent.
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*/
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int btrfs_dec_test_ordered_pending(struct inode *inode,
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struct btrfs_ordered_extent **cached,
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u64 file_offset, u64 io_size)
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{
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struct btrfs_ordered_inode_tree *tree;
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struct rb_node *node;
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struct btrfs_ordered_extent *entry = NULL;
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int ret;
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tree = &BTRFS_I(inode)->ordered_tree;
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spin_lock(&tree->lock);
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node = tree_search(tree, file_offset);
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if (!node) {
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ret = 1;
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goto out;
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}
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entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
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if (!offset_in_entry(entry, file_offset)) {
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ret = 1;
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goto out;
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}
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if (io_size > entry->bytes_left) {
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printk(KERN_CRIT "bad ordered accounting left %llu size %llu\n",
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(unsigned long long)entry->bytes_left,
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(unsigned long long)io_size);
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}
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entry->bytes_left -= io_size;
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if (entry->bytes_left == 0)
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ret = test_and_set_bit(BTRFS_ORDERED_IO_DONE, &entry->flags);
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else
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ret = 1;
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out:
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if (!ret && cached && entry) {
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*cached = entry;
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atomic_inc(&entry->refs);
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}
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spin_unlock(&tree->lock);
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return ret == 0;
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}
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/*
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* used to drop a reference on an ordered extent. This will free
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* the extent if the last reference is dropped
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*/
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int btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry)
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{
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struct list_head *cur;
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struct btrfs_ordered_sum *sum;
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if (atomic_dec_and_test(&entry->refs)) {
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while (!list_empty(&entry->list)) {
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cur = entry->list.next;
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sum = list_entry(cur, struct btrfs_ordered_sum, list);
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list_del(&sum->list);
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kfree(sum);
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}
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kfree(entry);
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}
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return 0;
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}
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/*
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* remove an ordered extent from the tree. No references are dropped
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* and you must wake_up entry->wait. You must hold the tree lock
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* while you call this function.
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*/
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static int __btrfs_remove_ordered_extent(struct inode *inode,
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struct btrfs_ordered_extent *entry)
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{
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struct btrfs_ordered_inode_tree *tree;
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struct btrfs_root *root = BTRFS_I(inode)->root;
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struct rb_node *node;
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tree = &BTRFS_I(inode)->ordered_tree;
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node = &entry->rb_node;
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rb_erase(node, &tree->tree);
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tree->last = NULL;
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set_bit(BTRFS_ORDERED_COMPLETE, &entry->flags);
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spin_lock(&root->fs_info->ordered_extent_lock);
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list_del_init(&entry->root_extent_list);
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/*
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* we have no more ordered extents for this inode and
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* no dirty pages. We can safely remove it from the
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* list of ordered extents
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*/
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if (RB_EMPTY_ROOT(&tree->tree) &&
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!mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY)) {
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list_del_init(&BTRFS_I(inode)->ordered_operations);
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}
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spin_unlock(&root->fs_info->ordered_extent_lock);
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return 0;
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}
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/*
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* remove an ordered extent from the tree. No references are dropped
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* but any waiters are woken.
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*/
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int btrfs_remove_ordered_extent(struct inode *inode,
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struct btrfs_ordered_extent *entry)
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{
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struct btrfs_ordered_inode_tree *tree;
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int ret;
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tree = &BTRFS_I(inode)->ordered_tree;
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spin_lock(&tree->lock);
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ret = __btrfs_remove_ordered_extent(inode, entry);
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spin_unlock(&tree->lock);
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wake_up(&entry->wait);
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return ret;
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}
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/*
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* wait for all the ordered extents in a root. This is done when balancing
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* space between drives.
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*/
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int btrfs_wait_ordered_extents(struct btrfs_root *root,
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int nocow_only, int delay_iput)
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{
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struct list_head splice;
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struct list_head *cur;
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struct btrfs_ordered_extent *ordered;
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struct inode *inode;
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INIT_LIST_HEAD(&splice);
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spin_lock(&root->fs_info->ordered_extent_lock);
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list_splice_init(&root->fs_info->ordered_extents, &splice);
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while (!list_empty(&splice)) {
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cur = splice.next;
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ordered = list_entry(cur, struct btrfs_ordered_extent,
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root_extent_list);
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if (nocow_only &&
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!test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags) &&
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!test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags)) {
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list_move(&ordered->root_extent_list,
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&root->fs_info->ordered_extents);
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cond_resched_lock(&root->fs_info->ordered_extent_lock);
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continue;
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}
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list_del_init(&ordered->root_extent_list);
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atomic_inc(&ordered->refs);
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/*
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* the inode may be getting freed (in sys_unlink path).
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*/
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inode = igrab(ordered->inode);
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spin_unlock(&root->fs_info->ordered_extent_lock);
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if (inode) {
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btrfs_start_ordered_extent(inode, ordered, 1);
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btrfs_put_ordered_extent(ordered);
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if (delay_iput)
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btrfs_add_delayed_iput(inode);
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else
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iput(inode);
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} else {
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btrfs_put_ordered_extent(ordered);
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}
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spin_lock(&root->fs_info->ordered_extent_lock);
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}
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spin_unlock(&root->fs_info->ordered_extent_lock);
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return 0;
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}
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/*
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* this is used during transaction commit to write all the inodes
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* added to the ordered operation list. These files must be fully on
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* disk before the transaction commits.
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*
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* we have two modes here, one is to just start the IO via filemap_flush
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* and the other is to wait for all the io. When we wait, we have an
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* extra check to make sure the ordered operation list really is empty
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* before we return
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*/
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int btrfs_run_ordered_operations(struct btrfs_root *root, int wait)
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{
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struct btrfs_inode *btrfs_inode;
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struct inode *inode;
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struct list_head splice;
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INIT_LIST_HEAD(&splice);
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mutex_lock(&root->fs_info->ordered_operations_mutex);
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spin_lock(&root->fs_info->ordered_extent_lock);
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again:
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list_splice_init(&root->fs_info->ordered_operations, &splice);
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while (!list_empty(&splice)) {
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btrfs_inode = list_entry(splice.next, struct btrfs_inode,
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ordered_operations);
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inode = &btrfs_inode->vfs_inode;
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list_del_init(&btrfs_inode->ordered_operations);
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/*
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* the inode may be getting freed (in sys_unlink path).
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*/
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inode = igrab(inode);
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if (!wait && inode) {
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list_add_tail(&BTRFS_I(inode)->ordered_operations,
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&root->fs_info->ordered_operations);
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}
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spin_unlock(&root->fs_info->ordered_extent_lock);
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if (inode) {
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if (wait)
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btrfs_wait_ordered_range(inode, 0, (u64)-1);
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else
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filemap_flush(inode->i_mapping);
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btrfs_add_delayed_iput(inode);
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}
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cond_resched();
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spin_lock(&root->fs_info->ordered_extent_lock);
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}
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if (wait && !list_empty(&root->fs_info->ordered_operations))
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goto again;
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spin_unlock(&root->fs_info->ordered_extent_lock);
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mutex_unlock(&root->fs_info->ordered_operations_mutex);
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return 0;
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}
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/*
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* Used to start IO or wait for a given ordered extent to finish.
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*
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|
* If wait is one, this effectively waits on page writeback for all the pages
|
|
* in the extent, and it waits on the io completion code to insert
|
|
* metadata into the btree corresponding to the extent
|
|
*/
|
|
void btrfs_start_ordered_extent(struct inode *inode,
|
|
struct btrfs_ordered_extent *entry,
|
|
int wait)
|
|
{
|
|
u64 start = entry->file_offset;
|
|
u64 end = start + entry->len - 1;
|
|
|
|
/*
|
|
* pages in the range can be dirty, clean or writeback. We
|
|
* start IO on any dirty ones so the wait doesn't stall waiting
|
|
* for pdflush to find them
|
|
*/
|
|
if (!test_bit(BTRFS_ORDERED_DIRECT, &entry->flags))
|
|
filemap_fdatawrite_range(inode->i_mapping, start, end);
|
|
if (wait) {
|
|
wait_event(entry->wait, test_bit(BTRFS_ORDERED_COMPLETE,
|
|
&entry->flags));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Used to wait on ordered extents across a large range of bytes.
|
|
*/
|
|
int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
|
|
{
|
|
u64 end;
|
|
u64 orig_end;
|
|
u64 wait_end;
|
|
struct btrfs_ordered_extent *ordered;
|
|
int found;
|
|
|
|
if (start + len < start) {
|
|
orig_end = INT_LIMIT(loff_t);
|
|
} else {
|
|
orig_end = start + len - 1;
|
|
if (orig_end > INT_LIMIT(loff_t))
|
|
orig_end = INT_LIMIT(loff_t);
|
|
}
|
|
wait_end = orig_end;
|
|
again:
|
|
/* start IO across the range first to instantiate any delalloc
|
|
* extents
|
|
*/
|
|
filemap_fdatawrite_range(inode->i_mapping, start, orig_end);
|
|
|
|
/* The compression code will leave pages locked but return from
|
|
* writepage without setting the page writeback. Starting again
|
|
* with WB_SYNC_ALL will end up waiting for the IO to actually start.
|
|
*/
|
|
filemap_fdatawrite_range(inode->i_mapping, start, orig_end);
|
|
|
|
filemap_fdatawait_range(inode->i_mapping, start, orig_end);
|
|
|
|
end = orig_end;
|
|
found = 0;
|
|
while (1) {
|
|
ordered = btrfs_lookup_first_ordered_extent(inode, end);
|
|
if (!ordered)
|
|
break;
|
|
if (ordered->file_offset > orig_end) {
|
|
btrfs_put_ordered_extent(ordered);
|
|
break;
|
|
}
|
|
if (ordered->file_offset + ordered->len < start) {
|
|
btrfs_put_ordered_extent(ordered);
|
|
break;
|
|
}
|
|
found++;
|
|
btrfs_start_ordered_extent(inode, ordered, 1);
|
|
end = ordered->file_offset;
|
|
btrfs_put_ordered_extent(ordered);
|
|
if (end == 0 || end == start)
|
|
break;
|
|
end--;
|
|
}
|
|
if (found || test_range_bit(&BTRFS_I(inode)->io_tree, start, orig_end,
|
|
EXTENT_DELALLOC, 0, NULL)) {
|
|
schedule_timeout(1);
|
|
goto again;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* find an ordered extent corresponding to file_offset. return NULL if
|
|
* nothing is found, otherwise take a reference on the extent and return it
|
|
*/
|
|
struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
|
|
u64 file_offset)
|
|
{
|
|
struct btrfs_ordered_inode_tree *tree;
|
|
struct rb_node *node;
|
|
struct btrfs_ordered_extent *entry = NULL;
|
|
|
|
tree = &BTRFS_I(inode)->ordered_tree;
|
|
spin_lock(&tree->lock);
|
|
node = tree_search(tree, file_offset);
|
|
if (!node)
|
|
goto out;
|
|
|
|
entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
|
|
if (!offset_in_entry(entry, file_offset))
|
|
entry = NULL;
|
|
if (entry)
|
|
atomic_inc(&entry->refs);
|
|
out:
|
|
spin_unlock(&tree->lock);
|
|
return entry;
|
|
}
|
|
|
|
/* Since the DIO code tries to lock a wide area we need to look for any ordered
|
|
* extents that exist in the range, rather than just the start of the range.
|
|
*/
|
|
struct btrfs_ordered_extent *btrfs_lookup_ordered_range(struct inode *inode,
|
|
u64 file_offset,
|
|
u64 len)
|
|
{
|
|
struct btrfs_ordered_inode_tree *tree;
|
|
struct rb_node *node;
|
|
struct btrfs_ordered_extent *entry = NULL;
|
|
|
|
tree = &BTRFS_I(inode)->ordered_tree;
|
|
spin_lock(&tree->lock);
|
|
node = tree_search(tree, file_offset);
|
|
if (!node) {
|
|
node = tree_search(tree, file_offset + len);
|
|
if (!node)
|
|
goto out;
|
|
}
|
|
|
|
while (1) {
|
|
entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
|
|
if (range_overlaps(entry, file_offset, len))
|
|
break;
|
|
|
|
if (entry->file_offset >= file_offset + len) {
|
|
entry = NULL;
|
|
break;
|
|
}
|
|
entry = NULL;
|
|
node = rb_next(node);
|
|
if (!node)
|
|
break;
|
|
}
|
|
out:
|
|
if (entry)
|
|
atomic_inc(&entry->refs);
|
|
spin_unlock(&tree->lock);
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* lookup and return any extent before 'file_offset'. NULL is returned
|
|
* if none is found
|
|
*/
|
|
struct btrfs_ordered_extent *
|
|
btrfs_lookup_first_ordered_extent(struct inode *inode, u64 file_offset)
|
|
{
|
|
struct btrfs_ordered_inode_tree *tree;
|
|
struct rb_node *node;
|
|
struct btrfs_ordered_extent *entry = NULL;
|
|
|
|
tree = &BTRFS_I(inode)->ordered_tree;
|
|
spin_lock(&tree->lock);
|
|
node = tree_search(tree, file_offset);
|
|
if (!node)
|
|
goto out;
|
|
|
|
entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
|
|
atomic_inc(&entry->refs);
|
|
out:
|
|
spin_unlock(&tree->lock);
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* After an extent is done, call this to conditionally update the on disk
|
|
* i_size. i_size is updated to cover any fully written part of the file.
|
|
*/
|
|
int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
|
|
struct btrfs_ordered_extent *ordered)
|
|
{
|
|
struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree;
|
|
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
|
|
u64 disk_i_size;
|
|
u64 new_i_size;
|
|
u64 i_size_test;
|
|
u64 i_size = i_size_read(inode);
|
|
struct rb_node *node;
|
|
struct rb_node *prev = NULL;
|
|
struct btrfs_ordered_extent *test;
|
|
int ret = 1;
|
|
|
|
if (ordered)
|
|
offset = entry_end(ordered);
|
|
else
|
|
offset = ALIGN(offset, BTRFS_I(inode)->root->sectorsize);
|
|
|
|
spin_lock(&tree->lock);
|
|
disk_i_size = BTRFS_I(inode)->disk_i_size;
|
|
|
|
/* truncate file */
|
|
if (disk_i_size > i_size) {
|
|
BTRFS_I(inode)->disk_i_size = i_size;
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* if the disk i_size is already at the inode->i_size, or
|
|
* this ordered extent is inside the disk i_size, we're done
|
|
*/
|
|
if (disk_i_size == i_size || offset <= disk_i_size) {
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* we can't update the disk_isize if there are delalloc bytes
|
|
* between disk_i_size and this ordered extent
|
|
*/
|
|
if (test_range_bit(io_tree, disk_i_size, offset - 1,
|
|
EXTENT_DELALLOC, 0, NULL)) {
|
|
goto out;
|
|
}
|
|
/*
|
|
* walk backward from this ordered extent to disk_i_size.
|
|
* if we find an ordered extent then we can't update disk i_size
|
|
* yet
|
|
*/
|
|
if (ordered) {
|
|
node = rb_prev(&ordered->rb_node);
|
|
} else {
|
|
prev = tree_search(tree, offset);
|
|
/*
|
|
* we insert file extents without involving ordered struct,
|
|
* so there should be no ordered struct cover this offset
|
|
*/
|
|
if (prev) {
|
|
test = rb_entry(prev, struct btrfs_ordered_extent,
|
|
rb_node);
|
|
BUG_ON(offset_in_entry(test, offset));
|
|
}
|
|
node = prev;
|
|
}
|
|
while (node) {
|
|
test = rb_entry(node, struct btrfs_ordered_extent, rb_node);
|
|
if (test->file_offset + test->len <= disk_i_size)
|
|
break;
|
|
if (test->file_offset >= i_size)
|
|
break;
|
|
if (test->file_offset >= disk_i_size)
|
|
goto out;
|
|
node = rb_prev(node);
|
|
}
|
|
new_i_size = min_t(u64, offset, i_size);
|
|
|
|
/*
|
|
* at this point, we know we can safely update i_size to at least
|
|
* the offset from this ordered extent. But, we need to
|
|
* walk forward and see if ios from higher up in the file have
|
|
* finished.
|
|
*/
|
|
if (ordered) {
|
|
node = rb_next(&ordered->rb_node);
|
|
} else {
|
|
if (prev)
|
|
node = rb_next(prev);
|
|
else
|
|
node = rb_first(&tree->tree);
|
|
}
|
|
i_size_test = 0;
|
|
if (node) {
|
|
/*
|
|
* do we have an area where IO might have finished
|
|
* between our ordered extent and the next one.
|
|
*/
|
|
test = rb_entry(node, struct btrfs_ordered_extent, rb_node);
|
|
if (test->file_offset > offset)
|
|
i_size_test = test->file_offset;
|
|
} else {
|
|
i_size_test = i_size;
|
|
}
|
|
|
|
/*
|
|
* i_size_test is the end of a region after this ordered
|
|
* extent where there are no ordered extents. As long as there
|
|
* are no delalloc bytes in this area, it is safe to update
|
|
* disk_i_size to the end of the region.
|
|
*/
|
|
if (i_size_test > offset &&
|
|
!test_range_bit(io_tree, offset, i_size_test - 1,
|
|
EXTENT_DELALLOC, 0, NULL)) {
|
|
new_i_size = min_t(u64, i_size_test, i_size);
|
|
}
|
|
BTRFS_I(inode)->disk_i_size = new_i_size;
|
|
ret = 0;
|
|
out:
|
|
/*
|
|
* we need to remove the ordered extent with the tree lock held
|
|
* so that other people calling this function don't find our fully
|
|
* processed ordered entry and skip updating the i_size
|
|
*/
|
|
if (ordered)
|
|
__btrfs_remove_ordered_extent(inode, ordered);
|
|
spin_unlock(&tree->lock);
|
|
if (ordered)
|
|
wake_up(&ordered->wait);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* search the ordered extents for one corresponding to 'offset' and
|
|
* try to find a checksum. This is used because we allow pages to
|
|
* be reclaimed before their checksum is actually put into the btree
|
|
*/
|
|
int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
|
|
u32 *sum)
|
|
{
|
|
struct btrfs_ordered_sum *ordered_sum;
|
|
struct btrfs_sector_sum *sector_sums;
|
|
struct btrfs_ordered_extent *ordered;
|
|
struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree;
|
|
unsigned long num_sectors;
|
|
unsigned long i;
|
|
u32 sectorsize = BTRFS_I(inode)->root->sectorsize;
|
|
int ret = 1;
|
|
|
|
ordered = btrfs_lookup_ordered_extent(inode, offset);
|
|
if (!ordered)
|
|
return 1;
|
|
|
|
spin_lock(&tree->lock);
|
|
list_for_each_entry_reverse(ordered_sum, &ordered->list, list) {
|
|
if (disk_bytenr >= ordered_sum->bytenr) {
|
|
num_sectors = ordered_sum->len / sectorsize;
|
|
sector_sums = ordered_sum->sums;
|
|
for (i = 0; i < num_sectors; i++) {
|
|
if (sector_sums[i].bytenr == disk_bytenr) {
|
|
*sum = sector_sums[i].sum;
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
out:
|
|
spin_unlock(&tree->lock);
|
|
btrfs_put_ordered_extent(ordered);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* add a given inode to the list of inodes that must be fully on
|
|
* disk before a transaction commit finishes.
|
|
*
|
|
* This basically gives us the ext3 style data=ordered mode, and it is mostly
|
|
* used to make sure renamed files are fully on disk.
|
|
*
|
|
* It is a noop if the inode is already fully on disk.
|
|
*
|
|
* If trans is not null, we'll do a friendly check for a transaction that
|
|
* is already flushing things and force the IO down ourselves.
|
|
*/
|
|
int btrfs_add_ordered_operation(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct inode *inode)
|
|
{
|
|
u64 last_mod;
|
|
|
|
last_mod = max(BTRFS_I(inode)->generation, BTRFS_I(inode)->last_trans);
|
|
|
|
/*
|
|
* if this file hasn't been changed since the last transaction
|
|
* commit, we can safely return without doing anything
|
|
*/
|
|
if (last_mod < root->fs_info->last_trans_committed)
|
|
return 0;
|
|
|
|
/*
|
|
* the transaction is already committing. Just start the IO and
|
|
* don't bother with all of this list nonsense
|
|
*/
|
|
if (trans && root->fs_info->running_transaction->blocked) {
|
|
btrfs_wait_ordered_range(inode, 0, (u64)-1);
|
|
return 0;
|
|
}
|
|
|
|
spin_lock(&root->fs_info->ordered_extent_lock);
|
|
if (list_empty(&BTRFS_I(inode)->ordered_operations)) {
|
|
list_add_tail(&BTRFS_I(inode)->ordered_operations,
|
|
&root->fs_info->ordered_operations);
|
|
}
|
|
spin_unlock(&root->fs_info->ordered_extent_lock);
|
|
|
|
return 0;
|
|
}
|