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| author | Fabio M. De Francesco <fmdefrancesco@gmail.com> | 2022-06-18 11:19:01 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-07-25 17:45:41 +0200 |
| commit | 5a6e6e7ce6b7df615a971f30bf4215b2dc389612 (patch) | |
| tree | 48059b4239af8ff4bcd2d0fdc311168eaa29f394 /fs/btrfs/zlib.c | |
| parent | btrfs: zlib: replace kmap() with kmap_local_page() in zlib_compress_pages() (diff) | |
| download | linux-5a6e6e7ce6b7df615a971f30bf4215b2dc389612.tar.xz linux-5a6e6e7ce6b7df615a971f30bf4215b2dc389612.zip | |
btrfs: zlib: replace kmap() with kmap_local_page() in zlib_decompress_bio()
The use of kmap() is being deprecated in favor of kmap_local_page(). With
kmap_local_page(), the mapping is per thread, CPU local and not globally
visible.
Therefore, use kmap_local_page() / kunmap_local() in zlib_decompress_bio()
because in this function the mappings are per thread and are not visible
in other contexts.
Tested with xfstests on QEMU + KVM 32-bits VM with 4GB of RAM and
HIGHMEM64G enabled. This patch passes 26/26 tests of group "compress".
Suggested-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/zlib.c')
| -rw-r--r-- | fs/btrfs/zlib.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/btrfs/zlib.c b/fs/btrfs/zlib.c index 82a43ac90387..b4f44662cda7 100644 --- a/fs/btrfs/zlib.c +++ b/fs/btrfs/zlib.c @@ -281,7 +281,7 @@ int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb) unsigned long buf_start; struct page **pages_in = cb->compressed_pages; - data_in = kmap(pages_in[page_in_index]); + data_in = kmap_local_page(pages_in[page_in_index]); workspace->strm.next_in = data_in; workspace->strm.avail_in = min_t(size_t, srclen, PAGE_SIZE); workspace->strm.total_in = 0; @@ -303,7 +303,7 @@ int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb) if (Z_OK != zlib_inflateInit2(&workspace->strm, wbits)) { pr_warn("BTRFS: inflateInit failed\n"); - kunmap(pages_in[page_in_index]); + kunmap_local(data_in); return -EIO; } while (workspace->strm.total_in < srclen) { @@ -330,13 +330,13 @@ int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb) if (workspace->strm.avail_in == 0) { unsigned long tmp; - kunmap(pages_in[page_in_index]); + kunmap_local(data_in); page_in_index++; if (page_in_index >= total_pages_in) { data_in = NULL; break; } - data_in = kmap(pages_in[page_in_index]); + data_in = kmap_local_page(pages_in[page_in_index]); workspace->strm.next_in = data_in; tmp = srclen - workspace->strm.total_in; workspace->strm.avail_in = min(tmp, PAGE_SIZE); @@ -349,7 +349,7 @@ int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb) done: zlib_inflateEnd(&workspace->strm); if (data_in) - kunmap(pages_in[page_in_index]); + kunmap_local(data_in); if (!ret) zero_fill_bio(cb->orig_bio); return ret; |