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Subject[PATCH V2 6/8] btrfs: use memcpy_[to|from]_page() and kmap_local_page()
Date
From: Ira Weiny <ira.weiny@intel.com>

There are many places where the pattern kmap/memcpy/kunmap occurs.

This pattern was lifted to the core common functions
memcpy_[to|from]_page().

Use these new functions to reduce the code, eliminate direct uses of
kmap, and leverage the new core functions use of kmap_local_page().

Also, there is 1 place where a kmap/memcpy is followed by an
optional memset. Here we leave the kmap open coded to avoid remapping
the page but use kmap_local_page() directly.

Development of this patch was aided by the coccinelle script:

// <smpl>
// SPDX-License-Identifier: GPL-2.0-only
// Find kmap/memcpy/kunmap pattern and replace with memcpy*page calls
//
// NOTE: Offsets and other expressions may be more complex than what the script
// will automatically generate. Therefore a catchall rule is provided to find
// the pattern which then must be evaluated by hand.
//
// Confidence: Low
// Copyright: (C) 2021 Intel Corporation
// URL: http://coccinelle.lip6.fr/
// Comments:
// Options:

//
// simple memcpy version
//
@ memcpy_rule1 @
expression page, T, F, B, Off;
identifier ptr;
type VP;
@@

(
-VP ptr = kmap(page);
|
-ptr = kmap(page);
|
-VP ptr = kmap_atomic(page);
|
-ptr = kmap_atomic(page);
)
<+...
(
-memcpy(ptr + Off, F, B);
+memcpy_to_page(page, Off, F, B);
|
-memcpy(ptr, F, B);
+memcpy_to_page(page, 0, F, B);
|
-memcpy(T, ptr + Off, B);
+memcpy_from_page(T, page, Off, B);
|
-memcpy(T, ptr, B);
+memcpy_from_page(T, page, 0, B);
)
...+>
(
-kunmap(page);
|
-kunmap_atomic(ptr);
)

// Remove any pointers left unused
@
depends on memcpy_rule1
@
identifier memcpy_rule1.ptr;
type VP, VP1;
@@

-VP ptr;
... when != ptr;
? VP1 ptr;

//
// Some callers kmap without a temp pointer
//
@ memcpy_rule2 @
expression page, T, Off, F, B;
@@

<+...
(
-memcpy(kmap(page) + Off, F, B);
+memcpy_to_page(page, Off, F, B);
|
-memcpy(kmap(page), F, B);
+memcpy_to_page(page, 0, F, B);
|
-memcpy(T, kmap(page) + Off, B);
+memcpy_from_page(T, page, Off, B);
|
-memcpy(T, kmap(page), B);
+memcpy_from_page(T, page, 0, B);
)
...+>
-kunmap(page);
// No need for the ptr variable removal

//
// Catch all
//
@ memcpy_rule3 @
expression page;
expression GenTo, GenFrom, GenSize;
identifier ptr;
type VP;
@@

(
-VP ptr = kmap(page);
|
-ptr = kmap(page);
|
-VP ptr = kmap_atomic(page);
|
-ptr = kmap_atomic(page);
)
<+...
(
//
// Some call sites have complex expressions within the memcpy
// match a catch all to be evaluated by hand.
//
-memcpy(GenTo, GenFrom, GenSize);
+memcpy_to_pageExtra(page, GenTo, GenFrom, GenSize);
+memcpy_from_pageExtra(GenTo, page, GenFrom, GenSize);
)
...+>
(
-kunmap(page);
|
-kunmap_atomic(ptr);
)

// Remove any pointers left unused
@
depends on memcpy_rule3
@
identifier memcpy_rule3.ptr;
type VP, VP1;
@@

-VP ptr;
... when != ptr;
? VP1 ptr;

// <smpl>

Signed-off-by: Ira Weiny <ira.weiny@intel.com>

---
Changes from v1:
Update commit message per David
https://lore.kernel.org/lkml/20210209151442.GU1993@suse.cz/
---
fs/btrfs/compression.c | 6 ++----
fs/btrfs/lzo.c | 4 ++--
fs/btrfs/reflink.c | 6 +-----
fs/btrfs/send.c | 7 ++-----
fs/btrfs/zlib.c | 5 ++---
fs/btrfs/zstd.c | 6 ++----
6 files changed, 11 insertions(+), 23 deletions(-)

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 5ae3fa0386b7..047b632b4139 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -1231,7 +1231,6 @@ int btrfs_decompress_buf2page(const char *buf, unsigned long buf_start,
unsigned long prev_start_byte;
unsigned long working_bytes = total_out - buf_start;
unsigned long bytes;
- char *kaddr;
struct bio_vec bvec = bio_iter_iovec(bio, bio->bi_iter);

/*
@@ -1262,9 +1261,8 @@ int btrfs_decompress_buf2page(const char *buf, unsigned long buf_start,
PAGE_SIZE - (buf_offset % PAGE_SIZE));
bytes = min(bytes, working_bytes);

- kaddr = kmap_atomic(bvec.bv_page);
- memcpy(kaddr + bvec.bv_offset, buf + buf_offset, bytes);
- kunmap_atomic(kaddr);
+ memcpy_to_page(bvec.bv_page, bvec.bv_offset, buf + buf_offset,
+ bytes);
flush_dcache_page(bvec.bv_page);

buf_offset += bytes;
diff --git a/fs/btrfs/lzo.c b/fs/btrfs/lzo.c
index aa9cd11f4b78..9084a950dc09 100644
--- a/fs/btrfs/lzo.c
+++ b/fs/btrfs/lzo.c
@@ -467,7 +467,7 @@ int lzo_decompress(struct list_head *ws, unsigned char *data_in,
destlen = min_t(unsigned long, destlen, PAGE_SIZE);
bytes = min_t(unsigned long, destlen, out_len - start_byte);

- kaddr = kmap_atomic(dest_page);
+ kaddr = kmap_local_page(dest_page);
memcpy(kaddr, workspace->buf + start_byte, bytes);

/*
@@ -477,7 +477,7 @@ int lzo_decompress(struct list_head *ws, unsigned char *data_in,
*/
if (bytes < destlen)
memset(kaddr+bytes, 0, destlen-bytes);
- kunmap_atomic(kaddr);
+ kunmap_local(kaddr);
out:
return ret;
}
diff --git a/fs/btrfs/reflink.c b/fs/btrfs/reflink.c
index b03e7891394e..74c62e49c0c9 100644
--- a/fs/btrfs/reflink.c
+++ b/fs/btrfs/reflink.c
@@ -103,12 +103,8 @@ static int copy_inline_to_page(struct btrfs_inode *inode,
set_bit(BTRFS_INODE_NO_DELALLOC_FLUSH, &inode->runtime_flags);

if (comp_type == BTRFS_COMPRESS_NONE) {
- char *map;
-
- map = kmap(page);
- memcpy(map, data_start, datal);
+ memcpy_to_page(page, 0, data_start, datal);
flush_dcache_page(page);
- kunmap(page);
} else {
ret = btrfs_decompress(comp_type, data_start, page, 0,
inline_size, datal);
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 78a35374d492..83982b3b7057 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -4948,7 +4948,6 @@ static int put_file_data(struct send_ctx *sctx, u64 offset, u32 len)
struct btrfs_fs_info *fs_info = root->fs_info;
struct inode *inode;
struct page *page;
- char *addr;
pgoff_t index = offset >> PAGE_SHIFT;
pgoff_t last_index;
unsigned pg_offset = offset_in_page(offset);
@@ -5001,10 +5000,8 @@ static int put_file_data(struct send_ctx *sctx, u64 offset, u32 len)
}
}

- addr = kmap(page);
- memcpy(sctx->send_buf + sctx->send_size, addr + pg_offset,
- cur_len);
- kunmap(page);
+ memcpy_from_page(sctx->send_buf + sctx->send_size, page,
+ pg_offset, cur_len);
unlock_page(page);
put_page(page);
index++;
diff --git a/fs/btrfs/zlib.c b/fs/btrfs/zlib.c
index 05615a1099db..d524acf7b3e5 100644
--- a/fs/btrfs/zlib.c
+++ b/fs/btrfs/zlib.c
@@ -432,9 +432,8 @@ int zlib_decompress(struct list_head *ws, unsigned char *data_in,
PAGE_SIZE - (buf_offset % PAGE_SIZE));
bytes = min(bytes, bytes_left);

- kaddr = kmap_atomic(dest_page);
- memcpy(kaddr + pg_offset, workspace->buf + buf_offset, bytes);
- kunmap_atomic(kaddr);
+ memcpy_to_page(dest_page, pg_offset,
+ workspace->buf + buf_offset, bytes);

pg_offset += bytes;
bytes_left -= bytes;
diff --git a/fs/btrfs/zstd.c b/fs/btrfs/zstd.c
index 9a4871636c6c..8e9626d63976 100644
--- a/fs/btrfs/zstd.c
+++ b/fs/btrfs/zstd.c
@@ -688,10 +688,8 @@ int zstd_decompress(struct list_head *ws, unsigned char *data_in,
bytes = min_t(unsigned long, destlen - pg_offset,
workspace->out_buf.size - buf_offset);

- kaddr = kmap_atomic(dest_page);
- memcpy(kaddr + pg_offset, workspace->out_buf.dst + buf_offset,
- bytes);
- kunmap_atomic(kaddr);
+ memcpy_to_page(dest_page, pg_offset,
+ workspace->out_buf.dst + buf_offset, bytes);

pg_offset += bytes;
}
--
2.28.0.rc0.12.gb6a658bd00c9
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