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| author | David Sterba <dsterba@suse.com> | 2023-11-15 19:59:39 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2023-12-15 22:27:01 +0300 |
| commit | 9ba965dca3b13757e49f98bbea7cf48f07633ff9 (patch) | |
| tree | ad8a92d059c15e8e141d11c7dee004b29d413736 /fs/btrfs/compression.h | |
| parent | 9ba7c686feb04f16088ca4523c204ed49b07fc0a (diff) | |
| download | linux-9ba965dca3b13757e49f98bbea7cf48f07633ff9.tar.xz | |
btrfs: use page alloc/free wrappers for compression pages
This is a preparation for managing compression pages in a cache-like
manner, instead of asking the allocator each time. The common allocation
and free wrappers are introduced and are functionally equivalent to the
current code.
The freeing helpers need to be carefully placed where the last reference
is dropped. This is either after directly allocating (error handling)
or when there are no other users of the pages (after copying the contents).
It's safe to not use the helper and use put_page() that will handle the
reference count. Not using the helper means there's lower number of
pages that could be reused without passing them back to allocator.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/compression.h')
| -rw-r--r-- | fs/btrfs/compression.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h index 03bb9d143fa7..93cc92974dee 100644 --- a/fs/btrfs/compression.h +++ b/fs/btrfs/compression.h @@ -32,6 +32,8 @@ static_assert((BTRFS_MAX_COMPRESSED % PAGE_SIZE) == 0); #define BTRFS_ZLIB_DEFAULT_LEVEL 3 +struct page; + struct compressed_bio { /* Number of compressed pages in the array */ unsigned int nr_pages; @@ -96,6 +98,9 @@ void btrfs_submit_compressed_read(struct btrfs_bio *bbio); unsigned int btrfs_compress_str2level(unsigned int type, const char *str); +struct page *btrfs_alloc_compr_page(void); +void btrfs_free_compr_page(struct page *page); + enum btrfs_compression_type { BTRFS_COMPRESS_NONE = 0, BTRFS_COMPRESS_ZLIB = 1, |