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80cc838423
linux-next/fs/btrfs
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Ira Weiny 80cc838423 btrfs: use copy_highpage() instead of 2 kmaps() 
There are many places where kmap/memove/kunmap patterns occur.

This pattern exists in the core common function copy_highpage().

Use copy_highpage to avoid open coding the use of kmap and leverages the
core functions use of kmap_local_page().

Development of this patch was aided by the following coccinelle script:

// <smpl>
// SPDX-License-Identifier: GPL-2.0-only
// Find kmap/copypage/kunmap pattern and replace with copy_highpage calls
//
// NOTE: The expressions in the copy page version of this kmap pattern are
// overly complex and so these all need individual attention.
//
// Confidence: Low
// Copyright: (C) 2021 Intel Corporation
// URL: http://coccinelle.lip6.fr/
// Comments:
// Options:

//
// Then a copy_page where we have 2 pages involved.
//
@ copy_page_rule @
expression page, page2, To, From, Size;
identifier ptr, ptr2;
type VP, VP2;
@@

/* kmap */
(
-VP ptr = kmap(page);
...
-VP2 ptr2 = kmap(page2);
|
-VP ptr = kmap_atomic(page);
...
-VP2 ptr2 = kmap_atomic(page2);
|
-ptr = kmap(page);
...
-ptr2 = kmap(page2);
|
-ptr = kmap_atomic(page);
...
-ptr2 = kmap_atomic(page2);
)

// 1 or more copy versions of the entire page
<+...
(
-copy_page(To, From);
+copy_highpage(To, From);
|
-memmove(To, From, Size);
+memmoveExtra(To, From, Size);
)
...+>

/* kunmap */
(
-kunmap(page2);
...
-kunmap(page);
|
-kunmap(page);
...
-kunmap(page2);
|
-kmap_atomic(ptr2);
...
-kmap_atomic(ptr);
)

// Remove any pointers left unused
@
depends on copy_page_rule
@
identifier copy_page_rule.ptr;
identifier copy_page_rule.ptr2;
type VP, VP1;
type VP2, VP21;
@@

-VP ptr;
	... when != ptr;
? VP1 ptr;
-VP2 ptr2;
	... when != ptr2;
? VP21 ptr2;

// </smpl>

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2021-02-26 12:45:15 +01:00
..
tests btrfs: tests: initialize test inodes location 2020-12-18 14:59:49 +01:00
acl.c
async-thread.c Btrfs: fix crash during unmount due to race with delayed inode workers 2020-03-23 17:01:51 +01:00
async-thread.h Btrfs: fix crash during unmount due to race with delayed inode workers 2020-03-23 17:01:51 +01:00
backref.c btrfs: do not double free backref nodes on error 2021-01-18 15:44:53 +01:00
backref.h btrfs: rename BTRFS_ROOT_REF_COWS to BTRFS_ROOT_SHAREABLE 2020-05-25 11:25:35 +02:00
block-group.c btrfs: fix possible free space tree corruption with online conversion 2021-01-25 18:44:37 +01:00
block-group.h btrfs: load free space cache asynchronously 2020-12-08 15:54:03 +01:00
block-rsv.c btrfs: introduce mount option rescue=ignorebadroots 2020-12-08 15:53:41 +01:00
block-rsv.h btrfs: Remove __ prefix from btrfs_block_rsv_release 2020-03-23 17:01:55 +01:00
btrfs_inode.h btrfs: fix deadlock when cloning inline extent and low on free metadata space 2020-12-18 14:49:50 +01:00
check-integrity.c btrfs: drop casts of bio bi_sector 2020-12-09 19:16:05 +01:00
check-integrity.h btrfs: remove btrfsic_submit_bh() 2020-03-23 17:01:39 +01:00
compression.c btrfs: use memcpy_[to|from]_page() and kmap_local_page() 2021-02-26 12:45:15 +01:00
compression.h btrfs: compression: move declarations to header 2020-10-07 12:06:55 +02:00
ctree.c btrfs: correctly calculate item size used when item key collision happens 2020-12-18 14:50:00 +01:00
ctree.h for-5.11-rc5-tag 2021-01-29 13:54:40 -08:00
delalloc-space.c btrfs: add btrfs_reserve_data_bytes and use it 2020-10-07 12:06:52 +02:00
delalloc-space.h btrfs: make btrfs_delalloc_reserve_space take btrfs_inode 2020-07-27 12:55:36 +02:00
delayed-inode.c btrfs: make btrfs_delayed_update_inode take btrfs_inode 2020-12-08 15:54:10 +01:00
delayed-inode.h btrfs: make btrfs_delayed_update_inode take btrfs_inode 2020-12-08 15:54:10 +01:00
delayed-ref.c btrfs: Remove __ prefix from btrfs_block_rsv_release 2020-03-23 17:01:55 +01:00
delayed-ref.h
dev-replace.c btrfs: fix deadlock when cloning inline extent and low on free metadata space 2020-12-18 14:49:50 +01:00
dev-replace.h btrfs: add __pure attribute to functions 2019-11-18 12:46:52 +01:00
dir-item.c btrfs: locking: rip out path->leave_spinning 2020-12-08 15:54:02 +01:00
discard.c btrfs: merge critical sections of discard lock in workfn 2020-12-18 14:59:54 +01:00
discard.h btrfs: cleanup btrfs_discard_update_discardable usage 2020-12-08 15:54:02 +01:00
disk-io.c btrfs: print the actual offset in btrfs_root_name 2021-01-07 17:25:05 +01:00
disk-io.h btrfs: rename bio_offset of extent_submit_bio_start_t to dio_file_offset 2020-12-09 19:16:09 +01:00
export.c btrfs: locking: rip out path->leave_spinning 2020-12-08 15:54:02 +01:00
export.h btrfs: export helpers for subvolume name/id resolution 2020-03-23 17:01:42 +01:00
extent_io.c btrfs: prevent NULL pointer dereference in extent_io_tree_panic 2021-01-07 17:25:05 +01:00
extent_io.h btrfs: update num_extent_pages to support subpage sized extent buffer 2020-12-09 19:16:10 +01:00
extent_map.c Btrfs: fix race between using extent maps and merging them 2020-02-12 17:16:46 +01:00
extent_map.h btrfs: remove extent_map::bdev 2019-11-18 23:43:44 +01:00
extent-io-tree.h btrfs: use fixed width int type for extent_state::state 2020-12-08 15:54:13 +01:00
extent-tree.c btrfs: fix log replay failure due to race with space cache rebuild 2021-01-25 18:44:53 +01:00
file-item.c btrfs: correctly calculate item size used when item key collision happens 2020-12-18 14:50:00 +01:00
file.c btrfs: disable fallocate in ZONED mode 2020-12-09 19:16:04 +01:00
free-space-cache.c btrfs: remove free space items when disabling space cache v1 2020-12-09 19:16:09 +01:00
free-space-cache.h btrfs: remove free space items when disabling space cache v1 2020-12-09 19:16:09 +01:00
free-space-tree.c btrfs: fix possible free space tree corruption with online conversion 2021-01-25 18:44:37 +01:00
free-space-tree.h btrfs: rename btrfs_block_group_cache 2019-11-18 17:51:51 +01:00
inode-item.c btrfs: locking: rip out path->leave_spinning 2020-12-08 15:54:02 +01:00
inode.c btrfs: shrink delalloc pages instead of full inodes 2021-01-08 16:36:44 +01:00
ioctl.c btrfs: fix deadlock when cloning inline extent and low on free metadata space 2020-12-18 14:49:50 +01:00
Kconfig btrfs: switch to iomap for direct IO 2020-10-07 12:06:57 +02:00
locking.c btrfs: remove the recurse parameter from __btrfs_tree_read_lock 2020-12-08 15:54:09 +01:00
locking.h btrfs: remove the recurse parameter from __btrfs_tree_read_lock 2020-12-08 15:54:09 +01:00
lzo.c btrfs: use memcpy_[to|from]_page() and kmap_local_page() 2021-02-26 12:45:15 +01:00
Makefile btrfs: remove inode number cache feature 2020-12-09 19:16:05 +01:00
misc.h btrfs: rename tree_entry to rb_simple_node and export it 2020-05-25 11:25:19 +02:00
ordered-data.c btrfs: remove btrfs_find_ordered_sum call from btrfs_lookup_bio_sums 2020-12-09 19:16:10 +01:00
ordered-data.h btrfs: remove btrfs_find_ordered_sum call from btrfs_lookup_bio_sums 2020-12-09 19:16:10 +01:00
orphan.c
print-tree.c btrfs: print the actual offset in btrfs_root_name 2021-01-07 17:25:05 +01:00
print-tree.h btrfs: print the actual offset in btrfs_root_name 2021-01-07 17:25:05 +01:00
props.c btrfs: simplify iget helpers 2020-05-25 11:25:37 +02:00
props.h
qgroup.c btrfs: fix transaction leak and crash after RO remount caused by qgroup rescan 2020-12-18 14:59:57 +01:00
qgroup.h btrfs: qgroup: export qgroups in sysfs 2020-07-27 12:55:37 +02:00
raid56.c btrfs: use copy_highpage() instead of 2 kmaps() 2021-02-26 12:45:15 +01:00
raid56.h
rcu-string.h btrfs: rcu-string: Replace zero-length array with flexible-array member 2020-03-23 17:01:53 +01:00
reada.c btrfs: pass the owner_root and level to alloc_extent_buffer 2020-12-08 15:54:07 +01:00
ref-verify.c btrfs: use btrfs_read_node_slot in walk_down_tree 2020-12-08 15:54:06 +01:00
ref-verify.h
reflink.c btrfs: use memcpy_[to|from]_page() and kmap_local_page() 2021-02-26 12:45:15 +01:00
reflink.h Btrfs: move all reflink implementation code into its own file 2020-03-23 17:01:54 +01:00
relocation.c btrfs: reloc: fix wrong file extent type check to avoid false ENOENT 2021-01-07 17:25:05 +01:00
root-tree.c btrfs: qgroup: fix qgroup meta rsv leak for subvolume operations 2020-10-07 12:12:13 +02:00
scrub.c btrfs: scrub: allow scrub to work with subpage sectorsize 2020-12-09 19:16:11 +01:00
send.c btrfs: use memcpy_[to|from]_page() and kmap_local_page() 2021-02-26 12:45:15 +01:00
send.h btrfs: send: avoid copying file data 2020-10-07 12:13:17 +02:00
space-info.c btrfs: shrink delalloc pages instead of full inodes 2021-01-08 16:36:44 +01:00
space-info.h btrfs: add btrfs_reserve_data_bytes and use it 2020-10-07 12:06:52 +02:00
struct-funcs.c btrfs: handle sectorsize < PAGE_SIZE case for extent buffer accessors 2020-12-09 19:16:10 +01:00
super.c btrfs: run delayed iputs when remounting RO to avoid leaking them 2020-12-18 15:00:08 +01:00
sysfs.c for-5.11/block-2020-12-14 2020-12-16 12:57:51 -08:00
sysfs.h btrfs: split and refactor btrfs_sysfs_remove_devices_dir 2020-10-07 12:12:21 +02:00
transaction.c btrfs: no need to run delayed refs after commit_fs_roots during commit 2021-01-12 15:35:04 +01:00
transaction.h btrfs: return bool from btrfs_should_end_transaction 2020-12-08 15:54:16 +01:00
tree-checker.c btrfs: tree-checker: check if chunk item end overflows 2021-01-07 17:25:05 +01:00
tree-checker.h
tree-defrag.c btrfs: locking: remove all the blocking helpers 2020-12-08 15:54:01 +01:00
tree-log.c btrfs: do not block inode logging for so long during transaction commit 2020-12-09 19:16:07 +01:00
tree-log.h btrfs: make fast fsyncs wait only for writeback 2020-10-07 12:06:56 +02:00
ulist.c
ulist.h
uuid-tree.c btrfs: remove unnecessary casts in printk 2020-12-08 15:53:52 +01:00
volumes.c for-5.11-rc5-tag 2021-01-29 13:54:40 -08:00
volumes.h btrfs: fix lockdep warning due to seqcount_mutex on 32bit arch 2021-01-25 18:44:50 +01:00
xattr.c btrfs: skip unnecessary searches for xattrs when logging an inode 2020-12-08 15:54:12 +01:00
xattr.h
zlib.c btrfs: use memcpy_[to|from]_page() and kmap_local_page() 2021-02-26 12:45:15 +01:00
zoned.c for-5.11/block-2020-12-14 2020-12-16 12:57:51 -08:00
zoned.h btrfs: implement log-structured superblock for ZONED mode 2020-12-09 19:16:04 +01:00
zstd.c btrfs: use memcpy_[to|from]_page() and kmap_local_page() 2021-02-26 12:45:15 +01:00