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btrfs: compression: drop kmap/kunmap from lzo 

As we don't use highmem pages anymore, drop the kmap/kunmap. The kmap is
simply page_address and kunmap is a no-op.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2021-06-14 22:25:53 +02:00
parent b0ee5e1ec4
commit 8c945d32e6
1 changed files with 10 additions and 28 deletions
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38
fs/btrfs/lzo.c
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@ -140,7 +140,7 @@ int lzo_compress_pages(struct list_head *ws, struct address_space *mapping,
*total_in = 0;
in_page = find_get_page(mapping, start >> PAGE_SHIFT);
data_in = kmap(in_page);
data_in = page_address(in_page);
/*
* store the size of all chunks of compressed data in
@ -151,7 +151,7 @@ int lzo_compress_pages(struct list_head *ws, struct address_space *mapping,
ret = -ENOMEM;
goto out;
}
cpage_out = kmap(out_page);
cpage_out = page_address(out_page);
out_offset = LZO_LEN;
tot_out = LZO_LEN;
pages[0] = out_page;
@ -209,7 +209,6 @@ int lzo_compress_pages(struct list_head *ws, struct address_space *mapping,
if (out_len == 0 && tot_in >= len)
break;
kunmap(out_page);
if (nr_pages == nr_dest_pages) {
out_page = NULL;
ret = -E2BIG;
@ -221,7 +220,7 @@ int lzo_compress_pages(struct list_head *ws, struct address_space *mapping,
ret = -ENOMEM;
goto out;
}
cpage_out = kmap(out_page);
cpage_out = page_address(out_page);
pages[nr_pages++] = out_page;
pg_bytes_left = PAGE_SIZE;
@ -243,12 +242,11 @@ int lzo_compress_pages(struct list_head *ws, struct address_space *mapping,
break;
bytes_left = len - tot_in;
kunmap(in_page);
put_page(in_page);
start += PAGE_SIZE;
in_page = find_get_page(mapping, start >> PAGE_SHIFT);
data_in = kmap(in_page);
data_in = page_address(in_page);
in_len = min(bytes_left, PAGE_SIZE);
}
@ -258,22 +256,17 @@ int lzo_compress_pages(struct list_head *ws, struct address_space *mapping,
}
/* store the size of all chunks of compressed data */
sizes_ptr = kmap_local_page(pages[0]);
sizes_ptr = page_address(pages[0]);
write_compress_length(sizes_ptr, tot_out);
kunmap_local(sizes_ptr);
ret = 0;
*total_out = tot_out;
*total_in = tot_in;
out:
*out_pages = nr_pages;
if (out_page)
kunmap(out_page);
if (in_page) {
kunmap(in_page);
if (in_page)
put_page(in_page);
}
return ret;
}
@ -299,12 +292,11 @@ int lzo_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
unsigned long tot_out;
unsigned long tot_len;
char *buf;
bool may_late_unmap, need_unmap;
struct page **pages_in = cb->compressed_pages;
u64 disk_start = cb->start;
struct bio *orig_bio = cb->orig_bio;
data_in = kmap(pages_in[0]);
data_in = page_address(pages_in[0]);
tot_len = read_compress_length(data_in);
/*
* Compressed data header check.
@ -345,13 +337,11 @@ int lzo_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
tot_in += in_len;
working_bytes = in_len;
may_late_unmap = need_unmap = false;
/* fast path: avoid using the working buffer */
if (in_page_bytes_left >= in_len) {
buf = data_in + in_offset;
bytes = in_len;
may_late_unmap = true;
goto cont;
}
@ -381,12 +371,8 @@ cont:
goto done;
}
if (may_late_unmap)
need_unmap = true;
else
kunmap(pages_in[page_in_index]);
data_in = kmap(pages_in[++page_in_index]);
page_in_index++;
data_in = page_address(pages_in[page_in_index]);
in_page_bytes_left = PAGE_SIZE;
in_offset = 0;
@ -396,8 +382,6 @@ cont:
out_len = max_segment_len;
ret = lzo1x_decompress_safe(buf, in_len, workspace->buf,
&out_len);
if (need_unmap)
kunmap(pages_in[page_in_index - 1]);
if (ret != LZO_E_OK) {
pr_warn("BTRFS: decompress failed\n");
ret = -EIO;
@ -413,7 +397,6 @@ cont:
break;
}
done:
kunmap(pages_in[page_in_index]);
if (!ret)
zero_fill_bio(orig_bio);
return ret;
@ -466,7 +449,7 @@ 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_local_page(dest_page);
kaddr = page_address(dest_page);
memcpy(kaddr, workspace->buf + start_byte, bytes);
/*
@ -476,7 +459,6 @@ int lzo_decompress(struct list_head *ws, unsigned char *data_in,
*/
if (bytes < destlen)
memset(kaddr+bytes, 0, destlen-bytes);
kunmap_local(kaddr);
out:
return ret;
}