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a39da514eb
Currently buffered writeback bios are allowed to span multiple
ordered_extents, although that basically never actually happens since
commit 4a445b7b61
("btrfs: don't merge pages into bio if their page
offset is not contiguous").
Supporting bios than span ordered_extents complicates the file
checksumming code, and prevents us from adding an ordered_extent pointer
to the btrfs_bio structure. Use the existing code to limit a bio to
single ordered_extent for zoned device writes for all writes.
This allows to remove the REQ_BTRFS_ONE_ORDERED flags, and the
handling of multiple ordered_extents in btrfs_csum_one_bio.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
1370 lines
38 KiB
C
1370 lines
38 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#include <linux/bio.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <linux/sched/mm.h>
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#include <crypto/hash.h>
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#include "messages.h"
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#include "misc.h"
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "bio.h"
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#include "print-tree.h"
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#include "compression.h"
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#include "fs.h"
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#include "accessors.h"
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#include "file-item.h"
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#include "super.h"
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#define __MAX_CSUM_ITEMS(r, size) ((unsigned long)(((BTRFS_LEAF_DATA_SIZE(r) - \
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sizeof(struct btrfs_item) * 2) / \
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size) - 1))
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#define MAX_CSUM_ITEMS(r, size) (min_t(u32, __MAX_CSUM_ITEMS(r, size), \
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PAGE_SIZE))
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/*
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* Set inode's size according to filesystem options.
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*
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* @inode: inode we want to update the disk_i_size for
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* @new_i_size: i_size we want to set to, 0 if we use i_size
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*
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* With NO_HOLES set this simply sets the disk_is_size to whatever i_size_read()
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* returns as it is perfectly fine with a file that has holes without hole file
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* extent items.
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*
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* However without NO_HOLES we need to only return the area that is contiguous
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* from the 0 offset of the file. Otherwise we could end up adjust i_size up
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* to an extent that has a gap in between.
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*
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* Finally new_i_size should only be set in the case of truncate where we're not
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* ready to use i_size_read() as the limiter yet.
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*/
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void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size)
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{
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struct btrfs_fs_info *fs_info = inode->root->fs_info;
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u64 start, end, i_size;
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int ret;
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spin_lock(&inode->lock);
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i_size = new_i_size ?: i_size_read(&inode->vfs_inode);
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if (btrfs_fs_incompat(fs_info, NO_HOLES)) {
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inode->disk_i_size = i_size;
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goto out_unlock;
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}
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ret = find_contiguous_extent_bit(&inode->file_extent_tree, 0, &start,
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&end, EXTENT_DIRTY);
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if (!ret && start == 0)
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i_size = min(i_size, end + 1);
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else
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i_size = 0;
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inode->disk_i_size = i_size;
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out_unlock:
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spin_unlock(&inode->lock);
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}
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/*
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* Mark range within a file as having a new extent inserted.
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*
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* @inode: inode being modified
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* @start: start file offset of the file extent we've inserted
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* @len: logical length of the file extent item
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*
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* Call when we are inserting a new file extent where there was none before.
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* Does not need to call this in the case where we're replacing an existing file
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* extent, however if not sure it's fine to call this multiple times.
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*
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* The start and len must match the file extent item, so thus must be sectorsize
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* aligned.
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*/
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int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start,
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u64 len)
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{
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if (len == 0)
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return 0;
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ASSERT(IS_ALIGNED(start + len, inode->root->fs_info->sectorsize));
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if (btrfs_fs_incompat(inode->root->fs_info, NO_HOLES))
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return 0;
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return set_extent_bit(&inode->file_extent_tree, start, start + len - 1,
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EXTENT_DIRTY, NULL);
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}
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/*
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* Mark an inode range as not having a backing extent.
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*
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* @inode: inode being modified
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* @start: start file offset of the file extent we've inserted
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* @len: logical length of the file extent item
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*
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* Called when we drop a file extent, for example when we truncate. Doesn't
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* need to be called for cases where we're replacing a file extent, like when
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* we've COWed a file extent.
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*
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* The start and len must match the file extent item, so thus must be sectorsize
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* aligned.
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*/
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int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
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u64 len)
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{
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if (len == 0)
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return 0;
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ASSERT(IS_ALIGNED(start + len, inode->root->fs_info->sectorsize) ||
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len == (u64)-1);
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if (btrfs_fs_incompat(inode->root->fs_info, NO_HOLES))
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return 0;
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return clear_extent_bit(&inode->file_extent_tree, start,
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start + len - 1, EXTENT_DIRTY, NULL);
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}
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static size_t bytes_to_csum_size(const struct btrfs_fs_info *fs_info, u32 bytes)
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{
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ASSERT(IS_ALIGNED(bytes, fs_info->sectorsize));
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return (bytes >> fs_info->sectorsize_bits) * fs_info->csum_size;
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}
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static size_t csum_size_to_bytes(const struct btrfs_fs_info *fs_info, u32 csum_size)
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{
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ASSERT(IS_ALIGNED(csum_size, fs_info->csum_size));
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return (csum_size / fs_info->csum_size) << fs_info->sectorsize_bits;
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}
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static inline u32 max_ordered_sum_bytes(const struct btrfs_fs_info *fs_info)
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{
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u32 max_csum_size = round_down(PAGE_SIZE - sizeof(struct btrfs_ordered_sum),
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fs_info->csum_size);
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return csum_size_to_bytes(fs_info, max_csum_size);
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}
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/*
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* Calculate the total size needed to allocate for an ordered sum structure
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* spanning @bytes in the file.
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*/
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static int btrfs_ordered_sum_size(struct btrfs_fs_info *fs_info, unsigned long bytes)
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{
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return sizeof(struct btrfs_ordered_sum) + bytes_to_csum_size(fs_info, bytes);
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}
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int btrfs_insert_hole_extent(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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u64 objectid, u64 pos, u64 num_bytes)
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{
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int ret = 0;
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struct btrfs_file_extent_item *item;
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struct btrfs_key file_key;
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struct btrfs_path *path;
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struct extent_buffer *leaf;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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file_key.objectid = objectid;
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file_key.offset = pos;
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file_key.type = BTRFS_EXTENT_DATA_KEY;
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ret = btrfs_insert_empty_item(trans, root, path, &file_key,
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sizeof(*item));
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if (ret < 0)
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goto out;
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BUG_ON(ret); /* Can't happen */
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leaf = path->nodes[0];
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item = btrfs_item_ptr(leaf, path->slots[0],
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struct btrfs_file_extent_item);
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btrfs_set_file_extent_disk_bytenr(leaf, item, 0);
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btrfs_set_file_extent_disk_num_bytes(leaf, item, 0);
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btrfs_set_file_extent_offset(leaf, item, 0);
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btrfs_set_file_extent_num_bytes(leaf, item, num_bytes);
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btrfs_set_file_extent_ram_bytes(leaf, item, num_bytes);
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btrfs_set_file_extent_generation(leaf, item, trans->transid);
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btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
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btrfs_set_file_extent_compression(leaf, item, 0);
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btrfs_set_file_extent_encryption(leaf, item, 0);
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btrfs_set_file_extent_other_encoding(leaf, item, 0);
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btrfs_mark_buffer_dirty(leaf);
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out:
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btrfs_free_path(path);
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return ret;
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}
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static struct btrfs_csum_item *
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btrfs_lookup_csum(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path,
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u64 bytenr, int cow)
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{
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struct btrfs_fs_info *fs_info = root->fs_info;
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int ret;
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struct btrfs_key file_key;
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struct btrfs_key found_key;
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struct btrfs_csum_item *item;
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struct extent_buffer *leaf;
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u64 csum_offset = 0;
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const u32 csum_size = fs_info->csum_size;
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int csums_in_item;
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file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
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file_key.offset = bytenr;
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file_key.type = BTRFS_EXTENT_CSUM_KEY;
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ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
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if (ret < 0)
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goto fail;
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leaf = path->nodes[0];
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if (ret > 0) {
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ret = 1;
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if (path->slots[0] == 0)
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goto fail;
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path->slots[0]--;
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btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
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if (found_key.type != BTRFS_EXTENT_CSUM_KEY)
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goto fail;
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csum_offset = (bytenr - found_key.offset) >>
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fs_info->sectorsize_bits;
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csums_in_item = btrfs_item_size(leaf, path->slots[0]);
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csums_in_item /= csum_size;
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if (csum_offset == csums_in_item) {
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ret = -EFBIG;
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goto fail;
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} else if (csum_offset > csums_in_item) {
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goto fail;
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}
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}
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item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
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item = (struct btrfs_csum_item *)((unsigned char *)item +
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csum_offset * csum_size);
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return item;
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fail:
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if (ret > 0)
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ret = -ENOENT;
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return ERR_PTR(ret);
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}
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int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path, u64 objectid,
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u64 offset, int mod)
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{
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struct btrfs_key file_key;
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int ins_len = mod < 0 ? -1 : 0;
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int cow = mod != 0;
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file_key.objectid = objectid;
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file_key.offset = offset;
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file_key.type = BTRFS_EXTENT_DATA_KEY;
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return btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
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}
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/*
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* Find checksums for logical bytenr range [disk_bytenr, disk_bytenr + len) and
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* store the result to @dst.
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*
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* Return >0 for the number of sectors we found.
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* Return 0 for the range [disk_bytenr, disk_bytenr + sectorsize) has no csum
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* for it. Caller may want to try next sector until one range is hit.
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* Return <0 for fatal error.
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*/
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static int search_csum_tree(struct btrfs_fs_info *fs_info,
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struct btrfs_path *path, u64 disk_bytenr,
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u64 len, u8 *dst)
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{
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struct btrfs_root *csum_root;
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struct btrfs_csum_item *item = NULL;
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struct btrfs_key key;
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const u32 sectorsize = fs_info->sectorsize;
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const u32 csum_size = fs_info->csum_size;
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u32 itemsize;
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int ret;
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u64 csum_start;
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u64 csum_len;
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ASSERT(IS_ALIGNED(disk_bytenr, sectorsize) &&
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IS_ALIGNED(len, sectorsize));
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/* Check if the current csum item covers disk_bytenr */
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if (path->nodes[0]) {
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item = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_csum_item);
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btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
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itemsize = btrfs_item_size(path->nodes[0], path->slots[0]);
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csum_start = key.offset;
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csum_len = (itemsize / csum_size) * sectorsize;
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if (in_range(disk_bytenr, csum_start, csum_len))
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goto found;
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}
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/* Current item doesn't contain the desired range, search again */
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btrfs_release_path(path);
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csum_root = btrfs_csum_root(fs_info, disk_bytenr);
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item = btrfs_lookup_csum(NULL, csum_root, path, disk_bytenr, 0);
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if (IS_ERR(item)) {
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ret = PTR_ERR(item);
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goto out;
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}
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btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
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itemsize = btrfs_item_size(path->nodes[0], path->slots[0]);
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csum_start = key.offset;
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csum_len = (itemsize / csum_size) * sectorsize;
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ASSERT(in_range(disk_bytenr, csum_start, csum_len));
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found:
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ret = (min(csum_start + csum_len, disk_bytenr + len) -
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disk_bytenr) >> fs_info->sectorsize_bits;
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read_extent_buffer(path->nodes[0], dst, (unsigned long)item,
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ret * csum_size);
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out:
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if (ret == -ENOENT || ret == -EFBIG)
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ret = 0;
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return ret;
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}
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|
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/*
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* Lookup the checksum for the read bio in csum tree.
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*
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* Return: BLK_STS_RESOURCE if allocating memory fails, BLK_STS_OK otherwise.
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*/
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blk_status_t btrfs_lookup_bio_sums(struct btrfs_bio *bbio)
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{
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struct btrfs_inode *inode = bbio->inode;
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struct btrfs_fs_info *fs_info = inode->root->fs_info;
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struct bio *bio = &bbio->bio;
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struct btrfs_path *path;
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const u32 sectorsize = fs_info->sectorsize;
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const u32 csum_size = fs_info->csum_size;
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u32 orig_len = bio->bi_iter.bi_size;
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u64 orig_disk_bytenr = bio->bi_iter.bi_sector << SECTOR_SHIFT;
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const unsigned int nblocks = orig_len >> fs_info->sectorsize_bits;
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blk_status_t ret = BLK_STS_OK;
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u32 bio_offset = 0;
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|
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if ((inode->flags & BTRFS_INODE_NODATASUM) ||
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test_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state))
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return BLK_STS_OK;
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|
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/*
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* This function is only called for read bio.
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*
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* This means two things:
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* - All our csums should only be in csum tree
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* No ordered extents csums, as ordered extents are only for write
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* path.
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* - No need to bother any other info from bvec
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* Since we're looking up csums, the only important info is the
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* disk_bytenr and the length, which can be extracted from bi_iter
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* directly.
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*/
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ASSERT(bio_op(bio) == REQ_OP_READ);
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path = btrfs_alloc_path();
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if (!path)
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return BLK_STS_RESOURCE;
|
|
|
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if (nblocks * csum_size > BTRFS_BIO_INLINE_CSUM_SIZE) {
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bbio->csum = kmalloc_array(nblocks, csum_size, GFP_NOFS);
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if (!bbio->csum) {
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btrfs_free_path(path);
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return BLK_STS_RESOURCE;
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}
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} else {
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bbio->csum = bbio->csum_inline;
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}
|
|
|
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/*
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* If requested number of sectors is larger than one leaf can contain,
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* kick the readahead for csum tree.
|
|
*/
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if (nblocks > fs_info->csums_per_leaf)
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|
path->reada = READA_FORWARD;
|
|
|
|
/*
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|
* the free space stuff is only read when it hasn't been
|
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* updated in the current transaction. So, we can safely
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* read from the commit root and sidestep a nasty deadlock
|
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* between reading the free space cache and updating the csum tree.
|
|
*/
|
|
if (btrfs_is_free_space_inode(inode)) {
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|
path->search_commit_root = 1;
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|
path->skip_locking = 1;
|
|
}
|
|
|
|
while (bio_offset < orig_len) {
|
|
int count;
|
|
u64 cur_disk_bytenr = orig_disk_bytenr + bio_offset;
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|
u8 *csum_dst = bbio->csum +
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(bio_offset >> fs_info->sectorsize_bits) * csum_size;
|
|
|
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count = search_csum_tree(fs_info, path, cur_disk_bytenr,
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orig_len - bio_offset, csum_dst);
|
|
if (count < 0) {
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|
ret = errno_to_blk_status(count);
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|
if (bbio->csum != bbio->csum_inline)
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kfree(bbio->csum);
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bbio->csum = NULL;
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break;
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|
}
|
|
|
|
/*
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* We didn't find a csum for this range. We need to make sure
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|
* we complain loudly about this, because we are not NODATASUM.
|
|
*
|
|
* However for the DATA_RELOC inode we could potentially be
|
|
* relocating data extents for a NODATASUM inode, so the inode
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|
* itself won't be marked with NODATASUM, but the extent we're
|
|
* copying is in fact NODATASUM. If we don't find a csum we
|
|
* assume this is the case.
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|
*/
|
|
if (count == 0) {
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memset(csum_dst, 0, csum_size);
|
|
count = 1;
|
|
|
|
if (inode->root->root_key.objectid ==
|
|
BTRFS_DATA_RELOC_TREE_OBJECTID) {
|
|
u64 file_offset = bbio->file_offset + bio_offset;
|
|
|
|
set_extent_bit(&inode->io_tree, file_offset,
|
|
file_offset + sectorsize - 1,
|
|
EXTENT_NODATASUM, NULL);
|
|
} else {
|
|
btrfs_warn_rl(fs_info,
|
|
"csum hole found for disk bytenr range [%llu, %llu)",
|
|
cur_disk_bytenr, cur_disk_bytenr + sectorsize);
|
|
}
|
|
}
|
|
bio_offset += count * sectorsize;
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_lookup_csums_list(struct btrfs_root *root, u64 start, u64 end,
|
|
struct list_head *list, int search_commit,
|
|
bool nowait)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_key key;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_ordered_sum *sums;
|
|
struct btrfs_csum_item *item;
|
|
LIST_HEAD(tmplist);
|
|
int ret;
|
|
|
|
ASSERT(IS_ALIGNED(start, fs_info->sectorsize) &&
|
|
IS_ALIGNED(end + 1, fs_info->sectorsize));
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
path->nowait = nowait;
|
|
if (search_commit) {
|
|
path->skip_locking = 1;
|
|
path->reada = READA_FORWARD;
|
|
path->search_commit_root = 1;
|
|
}
|
|
|
|
key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
key.offset = start;
|
|
key.type = BTRFS_EXTENT_CSUM_KEY;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto fail;
|
|
if (ret > 0 && path->slots[0] > 0) {
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
|
|
|
|
/*
|
|
* There are two cases we can hit here for the previous csum
|
|
* item:
|
|
*
|
|
* |<- search range ->|
|
|
* |<- csum item ->|
|
|
*
|
|
* Or
|
|
* |<- search range ->|
|
|
* |<- csum item ->|
|
|
*
|
|
* Check if the previous csum item covers the leading part of
|
|
* the search range. If so we have to start from previous csum
|
|
* item.
|
|
*/
|
|
if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
|
|
key.type == BTRFS_EXTENT_CSUM_KEY) {
|
|
if (bytes_to_csum_size(fs_info, start - key.offset) <
|
|
btrfs_item_size(leaf, path->slots[0] - 1))
|
|
path->slots[0]--;
|
|
}
|
|
}
|
|
|
|
while (start <= end) {
|
|
u64 csum_end;
|
|
|
|
leaf = path->nodes[0];
|
|
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
goto fail;
|
|
if (ret > 0)
|
|
break;
|
|
leaf = path->nodes[0];
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
key.type != BTRFS_EXTENT_CSUM_KEY ||
|
|
key.offset > end)
|
|
break;
|
|
|
|
if (key.offset > start)
|
|
start = key.offset;
|
|
|
|
csum_end = key.offset + csum_size_to_bytes(fs_info,
|
|
btrfs_item_size(leaf, path->slots[0]));
|
|
if (csum_end <= start) {
|
|
path->slots[0]++;
|
|
continue;
|
|
}
|
|
|
|
csum_end = min(csum_end, end + 1);
|
|
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_csum_item);
|
|
while (start < csum_end) {
|
|
unsigned long offset;
|
|
size_t size;
|
|
|
|
size = min_t(size_t, csum_end - start,
|
|
max_ordered_sum_bytes(fs_info));
|
|
sums = kzalloc(btrfs_ordered_sum_size(fs_info, size),
|
|
GFP_NOFS);
|
|
if (!sums) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
sums->logical = start;
|
|
sums->len = size;
|
|
|
|
offset = bytes_to_csum_size(fs_info, start - key.offset);
|
|
|
|
read_extent_buffer(path->nodes[0],
|
|
sums->sums,
|
|
((unsigned long)item) + offset,
|
|
bytes_to_csum_size(fs_info, size));
|
|
|
|
start += size;
|
|
list_add_tail(&sums->list, &tmplist);
|
|
}
|
|
path->slots[0]++;
|
|
}
|
|
ret = 0;
|
|
fail:
|
|
while (ret < 0 && !list_empty(&tmplist)) {
|
|
sums = list_entry(tmplist.next, struct btrfs_ordered_sum, list);
|
|
list_del(&sums->list);
|
|
kfree(sums);
|
|
}
|
|
list_splice_tail(&tmplist, list);
|
|
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Do the same work as btrfs_lookup_csums_list(), the difference is in how
|
|
* we return the result.
|
|
*
|
|
* This version will set the corresponding bits in @csum_bitmap to represent
|
|
* that there is a csum found.
|
|
* Each bit represents a sector. Thus caller should ensure @csum_buf passed
|
|
* in is large enough to contain all csums.
|
|
*/
|
|
int btrfs_lookup_csums_bitmap(struct btrfs_root *root, u64 start, u64 end,
|
|
u8 *csum_buf, unsigned long *csum_bitmap,
|
|
bool search_commit)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_key key;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_csum_item *item;
|
|
const u64 orig_start = start;
|
|
int ret;
|
|
|
|
ASSERT(IS_ALIGNED(start, fs_info->sectorsize) &&
|
|
IS_ALIGNED(end + 1, fs_info->sectorsize));
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
if (search_commit) {
|
|
path->skip_locking = 1;
|
|
path->reada = READA_FORWARD;
|
|
path->search_commit_root = 1;
|
|
}
|
|
|
|
key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
key.type = BTRFS_EXTENT_CSUM_KEY;
|
|
key.offset = start;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto fail;
|
|
if (ret > 0 && path->slots[0] > 0) {
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
|
|
|
|
/*
|
|
* There are two cases we can hit here for the previous csum
|
|
* item:
|
|
*
|
|
* |<- search range ->|
|
|
* |<- csum item ->|
|
|
*
|
|
* Or
|
|
* |<- search range ->|
|
|
* |<- csum item ->|
|
|
*
|
|
* Check if the previous csum item covers the leading part of
|
|
* the search range. If so we have to start from previous csum
|
|
* item.
|
|
*/
|
|
if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
|
|
key.type == BTRFS_EXTENT_CSUM_KEY) {
|
|
if (bytes_to_csum_size(fs_info, start - key.offset) <
|
|
btrfs_item_size(leaf, path->slots[0] - 1))
|
|
path->slots[0]--;
|
|
}
|
|
}
|
|
|
|
while (start <= end) {
|
|
u64 csum_end;
|
|
|
|
leaf = path->nodes[0];
|
|
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
goto fail;
|
|
if (ret > 0)
|
|
break;
|
|
leaf = path->nodes[0];
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
key.type != BTRFS_EXTENT_CSUM_KEY ||
|
|
key.offset > end)
|
|
break;
|
|
|
|
if (key.offset > start)
|
|
start = key.offset;
|
|
|
|
csum_end = key.offset + csum_size_to_bytes(fs_info,
|
|
btrfs_item_size(leaf, path->slots[0]));
|
|
if (csum_end <= start) {
|
|
path->slots[0]++;
|
|
continue;
|
|
}
|
|
|
|
csum_end = min(csum_end, end + 1);
|
|
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_csum_item);
|
|
while (start < csum_end) {
|
|
unsigned long offset;
|
|
size_t size;
|
|
u8 *csum_dest = csum_buf + bytes_to_csum_size(fs_info,
|
|
start - orig_start);
|
|
|
|
size = min_t(size_t, csum_end - start, end + 1 - start);
|
|
|
|
offset = bytes_to_csum_size(fs_info, start - key.offset);
|
|
|
|
read_extent_buffer(path->nodes[0], csum_dest,
|
|
((unsigned long)item) + offset,
|
|
bytes_to_csum_size(fs_info, size));
|
|
|
|
bitmap_set(csum_bitmap,
|
|
(start - orig_start) >> fs_info->sectorsize_bits,
|
|
size >> fs_info->sectorsize_bits);
|
|
|
|
start += size;
|
|
}
|
|
path->slots[0]++;
|
|
}
|
|
ret = 0;
|
|
fail:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Calculate checksums of the data contained inside a bio.
|
|
*/
|
|
blk_status_t btrfs_csum_one_bio(struct btrfs_bio *bbio)
|
|
{
|
|
struct btrfs_inode *inode = bbio->inode;
|
|
struct btrfs_fs_info *fs_info = inode->root->fs_info;
|
|
SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
|
|
struct bio *bio = &bbio->bio;
|
|
u64 offset = bbio->file_offset;
|
|
struct btrfs_ordered_sum *sums;
|
|
struct btrfs_ordered_extent *ordered = NULL;
|
|
char *data;
|
|
struct bvec_iter iter;
|
|
struct bio_vec bvec;
|
|
int index;
|
|
unsigned int blockcount;
|
|
int i;
|
|
unsigned nofs_flag;
|
|
|
|
nofs_flag = memalloc_nofs_save();
|
|
sums = kvzalloc(btrfs_ordered_sum_size(fs_info, bio->bi_iter.bi_size),
|
|
GFP_KERNEL);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
|
|
if (!sums)
|
|
return BLK_STS_RESOURCE;
|
|
|
|
sums->len = bio->bi_iter.bi_size;
|
|
INIT_LIST_HEAD(&sums->list);
|
|
|
|
sums->logical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
|
|
index = 0;
|
|
|
|
shash->tfm = fs_info->csum_shash;
|
|
|
|
bio_for_each_segment(bvec, bio, iter) {
|
|
if (!ordered) {
|
|
ordered = btrfs_lookup_ordered_extent(inode, offset);
|
|
/*
|
|
* The bio range is not covered by any ordered extent,
|
|
* must be a code logic error.
|
|
*/
|
|
if (unlikely(!ordered)) {
|
|
WARN(1, KERN_WARNING
|
|
"no ordered extent for root %llu ino %llu offset %llu\n",
|
|
inode->root->root_key.objectid,
|
|
btrfs_ino(inode), offset);
|
|
kvfree(sums);
|
|
return BLK_STS_IOERR;
|
|
}
|
|
}
|
|
|
|
blockcount = BTRFS_BYTES_TO_BLKS(fs_info,
|
|
bvec.bv_len + fs_info->sectorsize
|
|
- 1);
|
|
|
|
for (i = 0; i < blockcount; i++) {
|
|
data = bvec_kmap_local(&bvec);
|
|
crypto_shash_digest(shash,
|
|
data + (i * fs_info->sectorsize),
|
|
fs_info->sectorsize,
|
|
sums->sums + index);
|
|
kunmap_local(data);
|
|
index += fs_info->csum_size;
|
|
offset += fs_info->sectorsize;
|
|
}
|
|
|
|
}
|
|
|
|
bbio->sums = sums;
|
|
btrfs_add_ordered_sum(ordered, sums);
|
|
btrfs_put_ordered_extent(ordered);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Nodatasum I/O on zoned file systems still requires an btrfs_ordered_sum to
|
|
* record the updated logical address on Zone Append completion.
|
|
* Allocate just the structure with an empty sums array here for that case.
|
|
*/
|
|
blk_status_t btrfs_alloc_dummy_sum(struct btrfs_bio *bbio)
|
|
{
|
|
struct btrfs_ordered_extent *ordered =
|
|
btrfs_lookup_ordered_extent(bbio->inode, bbio->file_offset);
|
|
|
|
if (WARN_ON_ONCE(!ordered))
|
|
return BLK_STS_IOERR;
|
|
|
|
bbio->sums = kmalloc(sizeof(*bbio->sums), GFP_NOFS);
|
|
if (!bbio->sums)
|
|
return BLK_STS_RESOURCE;
|
|
bbio->sums->len = bbio->bio.bi_iter.bi_size;
|
|
bbio->sums->logical = bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT;
|
|
btrfs_add_ordered_sum(ordered, bbio->sums);
|
|
btrfs_put_ordered_extent(ordered);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove one checksum overlapping a range.
|
|
*
|
|
* This expects the key to describe the csum pointed to by the path, and it
|
|
* expects the csum to overlap the range [bytenr, len]
|
|
*
|
|
* The csum should not be entirely contained in the range and the range should
|
|
* not be entirely contained in the csum.
|
|
*
|
|
* This calls btrfs_truncate_item with the correct args based on the overlap,
|
|
* and fixes up the key as required.
|
|
*/
|
|
static noinline void truncate_one_csum(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
struct btrfs_key *key,
|
|
u64 bytenr, u64 len)
|
|
{
|
|
struct extent_buffer *leaf;
|
|
const u32 csum_size = fs_info->csum_size;
|
|
u64 csum_end;
|
|
u64 end_byte = bytenr + len;
|
|
u32 blocksize_bits = fs_info->sectorsize_bits;
|
|
|
|
leaf = path->nodes[0];
|
|
csum_end = btrfs_item_size(leaf, path->slots[0]) / csum_size;
|
|
csum_end <<= blocksize_bits;
|
|
csum_end += key->offset;
|
|
|
|
if (key->offset < bytenr && csum_end <= end_byte) {
|
|
/*
|
|
* [ bytenr - len ]
|
|
* [ ]
|
|
* [csum ]
|
|
* A simple truncate off the end of the item
|
|
*/
|
|
u32 new_size = (bytenr - key->offset) >> blocksize_bits;
|
|
new_size *= csum_size;
|
|
btrfs_truncate_item(path, new_size, 1);
|
|
} else if (key->offset >= bytenr && csum_end > end_byte &&
|
|
end_byte > key->offset) {
|
|
/*
|
|
* [ bytenr - len ]
|
|
* [ ]
|
|
* [csum ]
|
|
* we need to truncate from the beginning of the csum
|
|
*/
|
|
u32 new_size = (csum_end - end_byte) >> blocksize_bits;
|
|
new_size *= csum_size;
|
|
|
|
btrfs_truncate_item(path, new_size, 0);
|
|
|
|
key->offset = end_byte;
|
|
btrfs_set_item_key_safe(fs_info, path, key);
|
|
} else {
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Delete the csum items from the csum tree for a given range of bytes.
|
|
*/
|
|
int btrfs_del_csums(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, u64 bytenr, u64 len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
u64 end_byte = bytenr + len;
|
|
u64 csum_end;
|
|
struct extent_buffer *leaf;
|
|
int ret = 0;
|
|
const u32 csum_size = fs_info->csum_size;
|
|
u32 blocksize_bits = fs_info->sectorsize_bits;
|
|
|
|
ASSERT(root->root_key.objectid == BTRFS_CSUM_TREE_OBJECTID ||
|
|
root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
while (1) {
|
|
key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
key.offset = end_byte - 1;
|
|
key.type = BTRFS_EXTENT_CSUM_KEY;
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret > 0) {
|
|
ret = 0;
|
|
if (path->slots[0] == 0)
|
|
break;
|
|
path->slots[0]--;
|
|
} else if (ret < 0) {
|
|
break;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
|
|
if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
key.type != BTRFS_EXTENT_CSUM_KEY) {
|
|
break;
|
|
}
|
|
|
|
if (key.offset >= end_byte)
|
|
break;
|
|
|
|
csum_end = btrfs_item_size(leaf, path->slots[0]) / csum_size;
|
|
csum_end <<= blocksize_bits;
|
|
csum_end += key.offset;
|
|
|
|
/* this csum ends before we start, we're done */
|
|
if (csum_end <= bytenr)
|
|
break;
|
|
|
|
/* delete the entire item, it is inside our range */
|
|
if (key.offset >= bytenr && csum_end <= end_byte) {
|
|
int del_nr = 1;
|
|
|
|
/*
|
|
* Check how many csum items preceding this one in this
|
|
* leaf correspond to our range and then delete them all
|
|
* at once.
|
|
*/
|
|
if (key.offset > bytenr && path->slots[0] > 0) {
|
|
int slot = path->slots[0] - 1;
|
|
|
|
while (slot >= 0) {
|
|
struct btrfs_key pk;
|
|
|
|
btrfs_item_key_to_cpu(leaf, &pk, slot);
|
|
if (pk.offset < bytenr ||
|
|
pk.type != BTRFS_EXTENT_CSUM_KEY ||
|
|
pk.objectid !=
|
|
BTRFS_EXTENT_CSUM_OBJECTID)
|
|
break;
|
|
path->slots[0] = slot;
|
|
del_nr++;
|
|
key.offset = pk.offset;
|
|
slot--;
|
|
}
|
|
}
|
|
ret = btrfs_del_items(trans, root, path,
|
|
path->slots[0], del_nr);
|
|
if (ret)
|
|
break;
|
|
if (key.offset == bytenr)
|
|
break;
|
|
} else if (key.offset < bytenr && csum_end > end_byte) {
|
|
unsigned long offset;
|
|
unsigned long shift_len;
|
|
unsigned long item_offset;
|
|
/*
|
|
* [ bytenr - len ]
|
|
* [csum ]
|
|
*
|
|
* Our bytes are in the middle of the csum,
|
|
* we need to split this item and insert a new one.
|
|
*
|
|
* But we can't drop the path because the
|
|
* csum could change, get removed, extended etc.
|
|
*
|
|
* The trick here is the max size of a csum item leaves
|
|
* enough room in the tree block for a single
|
|
* item header. So, we split the item in place,
|
|
* adding a new header pointing to the existing
|
|
* bytes. Then we loop around again and we have
|
|
* a nicely formed csum item that we can neatly
|
|
* truncate.
|
|
*/
|
|
offset = (bytenr - key.offset) >> blocksize_bits;
|
|
offset *= csum_size;
|
|
|
|
shift_len = (len >> blocksize_bits) * csum_size;
|
|
|
|
item_offset = btrfs_item_ptr_offset(leaf,
|
|
path->slots[0]);
|
|
|
|
memzero_extent_buffer(leaf, item_offset + offset,
|
|
shift_len);
|
|
key.offset = bytenr;
|
|
|
|
/*
|
|
* btrfs_split_item returns -EAGAIN when the
|
|
* item changed size or key
|
|
*/
|
|
ret = btrfs_split_item(trans, root, path, &key, offset);
|
|
if (ret && ret != -EAGAIN) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
break;
|
|
}
|
|
ret = 0;
|
|
|
|
key.offset = end_byte - 1;
|
|
} else {
|
|
truncate_one_csum(fs_info, path, &key, bytenr, len);
|
|
if (key.offset < bytenr)
|
|
break;
|
|
}
|
|
btrfs_release_path(path);
|
|
}
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int find_next_csum_offset(struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
u64 *next_offset)
|
|
{
|
|
const u32 nritems = btrfs_header_nritems(path->nodes[0]);
|
|
struct btrfs_key found_key;
|
|
int slot = path->slots[0] + 1;
|
|
int ret;
|
|
|
|
if (nritems == 0 || slot >= nritems) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0) {
|
|
return ret;
|
|
} else if (ret > 0) {
|
|
*next_offset = (u64)-1;
|
|
return 0;
|
|
}
|
|
slot = path->slots[0];
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
|
|
|
|
if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
found_key.type != BTRFS_EXTENT_CSUM_KEY)
|
|
*next_offset = (u64)-1;
|
|
else
|
|
*next_offset = found_key.offset;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_ordered_sum *sums)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_key file_key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_path *path;
|
|
struct btrfs_csum_item *item;
|
|
struct btrfs_csum_item *item_end;
|
|
struct extent_buffer *leaf = NULL;
|
|
u64 next_offset;
|
|
u64 total_bytes = 0;
|
|
u64 csum_offset;
|
|
u64 bytenr;
|
|
u32 ins_size;
|
|
int index = 0;
|
|
int found_next;
|
|
int ret;
|
|
const u32 csum_size = fs_info->csum_size;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
again:
|
|
next_offset = (u64)-1;
|
|
found_next = 0;
|
|
bytenr = sums->logical + total_bytes;
|
|
file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
file_key.offset = bytenr;
|
|
file_key.type = BTRFS_EXTENT_CSUM_KEY;
|
|
|
|
item = btrfs_lookup_csum(trans, root, path, bytenr, 1);
|
|
if (!IS_ERR(item)) {
|
|
ret = 0;
|
|
leaf = path->nodes[0];
|
|
item_end = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_csum_item);
|
|
item_end = (struct btrfs_csum_item *)((char *)item_end +
|
|
btrfs_item_size(leaf, path->slots[0]));
|
|
goto found;
|
|
}
|
|
ret = PTR_ERR(item);
|
|
if (ret != -EFBIG && ret != -ENOENT)
|
|
goto out;
|
|
|
|
if (ret == -EFBIG) {
|
|
u32 item_size;
|
|
/* we found one, but it isn't big enough yet */
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size(leaf, path->slots[0]);
|
|
if ((item_size / csum_size) >=
|
|
MAX_CSUM_ITEMS(fs_info, csum_size)) {
|
|
/* already at max size, make a new one */
|
|
goto insert;
|
|
}
|
|
} else {
|
|
/* We didn't find a csum item, insert one. */
|
|
ret = find_next_csum_offset(root, path, &next_offset);
|
|
if (ret < 0)
|
|
goto out;
|
|
found_next = 1;
|
|
goto insert;
|
|
}
|
|
|
|
/*
|
|
* At this point, we know the tree has a checksum item that ends at an
|
|
* offset matching the start of the checksum range we want to insert.
|
|
* We try to extend that item as much as possible and then add as many
|
|
* checksums to it as they fit.
|
|
*
|
|
* First check if the leaf has enough free space for at least one
|
|
* checksum. If it has go directly to the item extension code, otherwise
|
|
* release the path and do a search for insertion before the extension.
|
|
*/
|
|
if (btrfs_leaf_free_space(leaf) >= csum_size) {
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
csum_offset = (bytenr - found_key.offset) >>
|
|
fs_info->sectorsize_bits;
|
|
goto extend_csum;
|
|
}
|
|
|
|
btrfs_release_path(path);
|
|
path->search_for_extension = 1;
|
|
ret = btrfs_search_slot(trans, root, &file_key, path,
|
|
csum_size, 1);
|
|
path->search_for_extension = 0;
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret > 0) {
|
|
if (path->slots[0] == 0)
|
|
goto insert;
|
|
path->slots[0]--;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
csum_offset = (bytenr - found_key.offset) >> fs_info->sectorsize_bits;
|
|
|
|
if (found_key.type != BTRFS_EXTENT_CSUM_KEY ||
|
|
found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
|
|
csum_offset >= MAX_CSUM_ITEMS(fs_info, csum_size)) {
|
|
goto insert;
|
|
}
|
|
|
|
extend_csum:
|
|
if (csum_offset == btrfs_item_size(leaf, path->slots[0]) /
|
|
csum_size) {
|
|
int extend_nr;
|
|
u64 tmp;
|
|
u32 diff;
|
|
|
|
tmp = sums->len - total_bytes;
|
|
tmp >>= fs_info->sectorsize_bits;
|
|
WARN_ON(tmp < 1);
|
|
extend_nr = max_t(int, 1, tmp);
|
|
|
|
/*
|
|
* A log tree can already have checksum items with a subset of
|
|
* the checksums we are trying to log. This can happen after
|
|
* doing a sequence of partial writes into prealloc extents and
|
|
* fsyncs in between, with a full fsync logging a larger subrange
|
|
* of an extent for which a previous fast fsync logged a smaller
|
|
* subrange. And this happens in particular due to merging file
|
|
* extent items when we complete an ordered extent for a range
|
|
* covered by a prealloc extent - this is done at
|
|
* btrfs_mark_extent_written().
|
|
*
|
|
* So if we try to extend the previous checksum item, which has
|
|
* a range that ends at the start of the range we want to insert,
|
|
* make sure we don't extend beyond the start offset of the next
|
|
* checksum item. If we are at the last item in the leaf, then
|
|
* forget the optimization of extending and add a new checksum
|
|
* item - it is not worth the complexity of releasing the path,
|
|
* getting the first key for the next leaf, repeat the btree
|
|
* search, etc, because log trees are temporary anyway and it
|
|
* would only save a few bytes of leaf space.
|
|
*/
|
|
if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
|
|
if (path->slots[0] + 1 >=
|
|
btrfs_header_nritems(path->nodes[0])) {
|
|
ret = find_next_csum_offset(root, path, &next_offset);
|
|
if (ret < 0)
|
|
goto out;
|
|
found_next = 1;
|
|
goto insert;
|
|
}
|
|
|
|
ret = find_next_csum_offset(root, path, &next_offset);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
tmp = (next_offset - bytenr) >> fs_info->sectorsize_bits;
|
|
if (tmp <= INT_MAX)
|
|
extend_nr = min_t(int, extend_nr, tmp);
|
|
}
|
|
|
|
diff = (csum_offset + extend_nr) * csum_size;
|
|
diff = min(diff,
|
|
MAX_CSUM_ITEMS(fs_info, csum_size) * csum_size);
|
|
|
|
diff = diff - btrfs_item_size(leaf, path->slots[0]);
|
|
diff = min_t(u32, btrfs_leaf_free_space(leaf), diff);
|
|
diff /= csum_size;
|
|
diff *= csum_size;
|
|
|
|
btrfs_extend_item(path, diff);
|
|
ret = 0;
|
|
goto csum;
|
|
}
|
|
|
|
insert:
|
|
btrfs_release_path(path);
|
|
csum_offset = 0;
|
|
if (found_next) {
|
|
u64 tmp;
|
|
|
|
tmp = sums->len - total_bytes;
|
|
tmp >>= fs_info->sectorsize_bits;
|
|
tmp = min(tmp, (next_offset - file_key.offset) >>
|
|
fs_info->sectorsize_bits);
|
|
|
|
tmp = max_t(u64, 1, tmp);
|
|
tmp = min_t(u64, tmp, MAX_CSUM_ITEMS(fs_info, csum_size));
|
|
ins_size = csum_size * tmp;
|
|
} else {
|
|
ins_size = csum_size;
|
|
}
|
|
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
|
|
ins_size);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (WARN_ON(ret != 0))
|
|
goto out;
|
|
leaf = path->nodes[0];
|
|
csum:
|
|
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
|
|
item_end = (struct btrfs_csum_item *)((unsigned char *)item +
|
|
btrfs_item_size(leaf, path->slots[0]));
|
|
item = (struct btrfs_csum_item *)((unsigned char *)item +
|
|
csum_offset * csum_size);
|
|
found:
|
|
ins_size = (u32)(sums->len - total_bytes) >> fs_info->sectorsize_bits;
|
|
ins_size *= csum_size;
|
|
ins_size = min_t(u32, (unsigned long)item_end - (unsigned long)item,
|
|
ins_size);
|
|
write_extent_buffer(leaf, sums->sums + index, (unsigned long)item,
|
|
ins_size);
|
|
|
|
index += ins_size;
|
|
ins_size /= csum_size;
|
|
total_bytes += ins_size * fs_info->sectorsize;
|
|
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
if (total_bytes < sums->len) {
|
|
btrfs_release_path(path);
|
|
cond_resched();
|
|
goto again;
|
|
}
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
|
|
const struct btrfs_path *path,
|
|
struct btrfs_file_extent_item *fi,
|
|
struct extent_map *em)
|
|
{
|
|
struct btrfs_fs_info *fs_info = inode->root->fs_info;
|
|
struct btrfs_root *root = inode->root;
|
|
struct extent_buffer *leaf = path->nodes[0];
|
|
const int slot = path->slots[0];
|
|
struct btrfs_key key;
|
|
u64 extent_start, extent_end;
|
|
u64 bytenr;
|
|
u8 type = btrfs_file_extent_type(leaf, fi);
|
|
int compress_type = btrfs_file_extent_compression(leaf, fi);
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
extent_start = key.offset;
|
|
extent_end = btrfs_file_extent_end(path);
|
|
em->ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi);
|
|
em->generation = btrfs_file_extent_generation(leaf, fi);
|
|
if (type == BTRFS_FILE_EXTENT_REG ||
|
|
type == BTRFS_FILE_EXTENT_PREALLOC) {
|
|
em->start = extent_start;
|
|
em->len = extent_end - extent_start;
|
|
em->orig_start = extent_start -
|
|
btrfs_file_extent_offset(leaf, fi);
|
|
em->orig_block_len = btrfs_file_extent_disk_num_bytes(leaf, fi);
|
|
bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
|
|
if (bytenr == 0) {
|
|
em->block_start = EXTENT_MAP_HOLE;
|
|
return;
|
|
}
|
|
if (compress_type != BTRFS_COMPRESS_NONE) {
|
|
set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
|
|
em->compress_type = compress_type;
|
|
em->block_start = bytenr;
|
|
em->block_len = em->orig_block_len;
|
|
} else {
|
|
bytenr += btrfs_file_extent_offset(leaf, fi);
|
|
em->block_start = bytenr;
|
|
em->block_len = em->len;
|
|
if (type == BTRFS_FILE_EXTENT_PREALLOC)
|
|
set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
|
|
}
|
|
} else if (type == BTRFS_FILE_EXTENT_INLINE) {
|
|
em->block_start = EXTENT_MAP_INLINE;
|
|
em->start = extent_start;
|
|
em->len = extent_end - extent_start;
|
|
/*
|
|
* Initialize orig_start and block_len with the same values
|
|
* as in inode.c:btrfs_get_extent().
|
|
*/
|
|
em->orig_start = EXTENT_MAP_HOLE;
|
|
em->block_len = (u64)-1;
|
|
em->compress_type = compress_type;
|
|
if (compress_type != BTRFS_COMPRESS_NONE)
|
|
set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
|
|
} else {
|
|
btrfs_err(fs_info,
|
|
"unknown file extent item type %d, inode %llu, offset %llu, "
|
|
"root %llu", type, btrfs_ino(inode), extent_start,
|
|
root->root_key.objectid);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns the end offset (non inclusive) of the file extent item the given path
|
|
* points to. If it points to an inline extent, the returned offset is rounded
|
|
* up to the sector size.
|
|
*/
|
|
u64 btrfs_file_extent_end(const struct btrfs_path *path)
|
|
{
|
|
const struct extent_buffer *leaf = path->nodes[0];
|
|
const int slot = path->slots[0];
|
|
struct btrfs_file_extent_item *fi;
|
|
struct btrfs_key key;
|
|
u64 end;
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
ASSERT(key.type == BTRFS_EXTENT_DATA_KEY);
|
|
fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
|
|
|
|
if (btrfs_file_extent_type(leaf, fi) == BTRFS_FILE_EXTENT_INLINE) {
|
|
end = btrfs_file_extent_ram_bytes(leaf, fi);
|
|
end = ALIGN(key.offset + end, leaf->fs_info->sectorsize);
|
|
} else {
|
|
end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
|
|
}
|
|
|
|
return end;
|
|
}
|