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f2fs: compress: add .{init,destroy}_decompress_ctx callback

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Add below two callback interfaces in struct f2fs_compress_ops:

	int (*init_decompress_ctx)(struct decompress_io_ctx *dic);
	void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic);

Which will be used by zstd compress algorithm later.

In addition, this patch adds callback function pointer check, so that
specified algorithm can avoid defining unneeded functions.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-03-03 16:57:07 +08:00 committed by Jaegeuk Kim
parent 09ff48011e
commit 23b1faaade
1 changed files with 21 additions and 6 deletions
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27
fs/f2fs/compress.c
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@ -20,6 +20,8 @@ struct f2fs_compress_ops {
int (*init_compress_ctx)(struct compress_ctx *cc);
void (*destroy_compress_ctx)(struct compress_ctx *cc);
int (*compress_pages)(struct compress_ctx *cc);
int (*init_decompress_ctx)(struct decompress_io_ctx *dic);
void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic);
int (*decompress_pages)(struct decompress_io_ctx *dic);
};
@ -332,9 +334,11 @@ static int f2fs_compress_pages(struct compress_ctx *cc)
trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
cc->cluster_size, fi->i_compress_algorithm);
ret = cops->init_compress_ctx(cc);
if (ret)
goto out;
if (cops->init_compress_ctx) {
ret = cops->init_compress_ctx(cc);
if (ret)
goto out;
}
max_len = COMPRESS_HEADER_SIZE + cc->clen;
cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
@ -396,7 +400,8 @@ static int f2fs_compress_pages(struct compress_ctx *cc)
cc->cpages[i] = NULL;
}
cops->destroy_compress_ctx(cc);
if (cops->destroy_compress_ctx)
cops->destroy_compress_ctx(cc);
cc->nr_cpages = nr_cpages;
@ -416,7 +421,8 @@ static int f2fs_compress_pages(struct compress_ctx *cc)
kfree(cc->cpages);
cc->cpages = NULL;
destroy_compress_ctx:
cops->destroy_compress_ctx(cc);
if (cops->destroy_compress_ctx)
cops->destroy_compress_ctx(cc);
out:
trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
cc->clen, ret);
@ -450,10 +456,16 @@ void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
goto out_free_dic;
}
if (cops->init_decompress_ctx) {
ret = cops->init_decompress_ctx(dic);
if (ret)
goto out_free_dic;
}
dic->rbuf = vmap(dic->tpages, dic->cluster_size, VM_MAP, PAGE_KERNEL);
if (!dic->rbuf) {
ret = -ENOMEM;
goto out_free_dic;
goto destroy_decompress_ctx;
}
dic->cbuf = vmap(dic->cpages, dic->nr_cpages, VM_MAP, PAGE_KERNEL_RO);
@ -476,6 +488,9 @@ void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
vunmap(dic->cbuf);
out_vunmap_rbuf:
vunmap(dic->rbuf);
destroy_decompress_ctx:
if (cops->destroy_decompress_ctx)
cops->destroy_decompress_ctx(dic);
out_free_dic:
if (verity)
refcount_set(&dic->ref, dic->nr_cpages);