[PATCH 1/3] erofs: move each decompressor to its own source file

From: Gao Xiang
Date: Tue Jul 09 2024 - 05:41:51 EST

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Thus *_config() function declarations can be avoided.

Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
---
fs/erofs/compress.h | 20 +++++-------------
fs/erofs/decompressor.c | 36 ++++++++++-----------------------
fs/erofs/decompressor_deflate.c | 12 ++++++++---
fs/erofs/decompressor_lzma.c | 12 ++++++++---
fs/erofs/decompressor_zstd.c | 12 ++++++++---
fs/erofs/zdata.c | 2 +-
6 files changed, 44 insertions(+), 50 deletions(-)

diff --git a/fs/erofs/compress.h b/fs/erofs/compress.h
index 19d53c30c8af..c68d5739932f 100644
--- a/fs/erofs/compress.h
+++ b/fs/erofs/compress.h
@@ -81,21 +81,11 @@ static inline bool z_erofs_put_shortlivedpage(struct page **pagepool,
return true;
}

+extern const struct z_erofs_decompressor z_erofs_lzma_decomp;
+extern const struct z_erofs_decompressor z_erofs_deflate_decomp;
+extern const struct z_erofs_decompressor z_erofs_zstd_decomp;
+extern const struct z_erofs_decompressor *z_erofs_decomp[];
+
int z_erofs_fixup_insize(struct z_erofs_decompress_req *rq, const char *padbuf,
unsigned int padbufsize);
-extern const struct z_erofs_decompressor erofs_decompressors[];
-
-/* prototypes for specific algorithms */
-int z_erofs_load_lzma_config(struct super_block *sb,
- struct erofs_super_block *dsb, void *data, int size);
-int z_erofs_load_deflate_config(struct super_block *sb,
- struct erofs_super_block *dsb, void *data, int size);
-int z_erofs_load_zstd_config(struct super_block *sb,
- struct erofs_super_block *dsb, void *data, int size);
-int z_erofs_lzma_decompress(struct z_erofs_decompress_req *rq,
- struct page **pagepool);
-int z_erofs_deflate_decompress(struct z_erofs_decompress_req *rq,
- struct page **pagepool);
-int z_erofs_zstd_decompress(struct z_erofs_decompress_req *rq,
- struct page **pgpl);
#endif
diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c
index 9d85b6c11c6b..de50a9de4e8a 100644
--- a/fs/erofs/decompressor.c
+++ b/fs/erofs/decompressor.c
@@ -371,40 +371,28 @@ static int z_erofs_transform_plain(struct z_erofs_decompress_req *rq,
return 0;
}

-const struct z_erofs_decompressor erofs_decompressors[] = {
- [Z_EROFS_COMPRESSION_SHIFTED] = {
+const struct z_erofs_decompressor *z_erofs_decomp[] = {
+ [Z_EROFS_COMPRESSION_SHIFTED] = &(const struct z_erofs_decompressor) {
.decompress = z_erofs_transform_plain,
.name = "shifted"
},
- [Z_EROFS_COMPRESSION_INTERLACED] = {
+ [Z_EROFS_COMPRESSION_INTERLACED] = &(const struct z_erofs_decompressor) {
.decompress = z_erofs_transform_plain,
.name = "interlaced"
},
- [Z_EROFS_COMPRESSION_LZ4] = {
+ [Z_EROFS_COMPRESSION_LZ4] = &(const struct z_erofs_decompressor) {
.config = z_erofs_load_lz4_config,
.decompress = z_erofs_lz4_decompress,
.name = "lz4"
},
#ifdef CONFIG_EROFS_FS_ZIP_LZMA
- [Z_EROFS_COMPRESSION_LZMA] = {
- .config = z_erofs_load_lzma_config,
- .decompress = z_erofs_lzma_decompress,
- .name = "lzma"
- },
+ [Z_EROFS_COMPRESSION_LZMA] = &z_erofs_lzma_decomp,
#endif
#ifdef CONFIG_EROFS_FS_ZIP_DEFLATE
- [Z_EROFS_COMPRESSION_DEFLATE] = {
- .config = z_erofs_load_deflate_config,
- .decompress = z_erofs_deflate_decompress,
- .name = "deflate"
- },
+ [Z_EROFS_COMPRESSION_DEFLATE] = &z_erofs_deflate_decomp,
#endif
#ifdef CONFIG_EROFS_FS_ZIP_ZSTD
- [Z_EROFS_COMPRESSION_ZSTD] = {
- .config = z_erofs_load_zstd_config,
- .decompress = z_erofs_zstd_decompress,
- .name = "zstd"
- },
+ [Z_EROFS_COMPRESSION_ZSTD] = &z_erofs_zstd_decomp,
#endif
};

@@ -432,6 +420,7 @@ int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb)
offset = EROFS_SUPER_OFFSET + sbi->sb_size;
alg = 0;
for (algs = sbi->available_compr_algs; algs; algs >>= 1, ++alg) {
+ const struct z_erofs_decompressor *dec = z_erofs_decomp[alg];
void *data;

if (!(algs & 1))
@@ -443,16 +432,13 @@ int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb)
break;
}

- if (alg >= ARRAY_SIZE(erofs_decompressors) ||
- !erofs_decompressors[alg].config) {
+ if (alg < Z_EROFS_COMPRESSION_MAX && dec && dec->config) {
+ ret = dec->config(sb, dsb, data, size);
+ } else {
erofs_err(sb, "algorithm %d isn't enabled on this kernel",
alg);
ret = -EOPNOTSUPP;
- } else {
- ret = erofs_decompressors[alg].config(sb,
- dsb, data, size);
}
-
kfree(data);
if (ret)
break;
diff --git a/fs/erofs/decompressor_deflate.c b/fs/erofs/decompressor_deflate.c
index 3a3461561a3c..1c0ed77dcdb2 100644
--- a/fs/erofs/decompressor_deflate.c
+++ b/fs/erofs/decompressor_deflate.c
@@ -49,7 +49,7 @@ int __init z_erofs_deflate_init(void)
return 0;
}

-int z_erofs_load_deflate_config(struct super_block *sb,
+static int z_erofs_load_deflate_config(struct super_block *sb,
struct erofs_super_block *dsb, void *data, int size)
{
struct z_erofs_deflate_cfgs *dfl = data;
@@ -97,8 +97,8 @@ int z_erofs_load_deflate_config(struct super_block *sb,
return -ENOMEM;
}

-int z_erofs_deflate_decompress(struct z_erofs_decompress_req *rq,
- struct page **pgpl)
+static int z_erofs_deflate_decompress(struct z_erofs_decompress_req *rq,
+ struct page **pgpl)
{
const unsigned int nrpages_out =
PAGE_ALIGN(rq->pageofs_out + rq->outputsize) >> PAGE_SHIFT;
@@ -252,3 +252,9 @@ int z_erofs_deflate_decompress(struct z_erofs_decompress_req *rq,
wake_up(&z_erofs_deflate_wq);
return err;
}
+
+const struct z_erofs_decompressor z_erofs_deflate_decomp = {
+ .config = z_erofs_load_deflate_config,
+ .decompress = z_erofs_deflate_decompress,
+ .name = "deflate",
+};
diff --git a/fs/erofs/decompressor_lzma.c b/fs/erofs/decompressor_lzma.c
index 4b28dc130c9f..9cab3a2f7558 100644
--- a/fs/erofs/decompressor_lzma.c
+++ b/fs/erofs/decompressor_lzma.c
@@ -70,7 +70,7 @@ int __init z_erofs_lzma_init(void)
return 0;
}

-int z_erofs_load_lzma_config(struct super_block *sb,
+static int z_erofs_load_lzma_config(struct super_block *sb,
struct erofs_super_block *dsb, void *data, int size)
{
static DEFINE_MUTEX(lzma_resize_mutex);
@@ -147,8 +147,8 @@ int z_erofs_load_lzma_config(struct super_block *sb,
return err;
}

-int z_erofs_lzma_decompress(struct z_erofs_decompress_req *rq,
- struct page **pgpl)
+static int z_erofs_lzma_decompress(struct z_erofs_decompress_req *rq,
+ struct page **pgpl)
{
const unsigned int nrpages_out =
PAGE_ALIGN(rq->pageofs_out + rq->outputsize) >> PAGE_SHIFT;
@@ -293,3 +293,9 @@ int z_erofs_lzma_decompress(struct z_erofs_decompress_req *rq,
wake_up(&z_erofs_lzma_wq);
return err;
}
+
+const struct z_erofs_decompressor z_erofs_lzma_decomp = {
+ .config = z_erofs_load_lzma_config,
+ .decompress = z_erofs_lzma_decompress,
+ .name = "lzma"
+};
diff --git a/fs/erofs/decompressor_zstd.c b/fs/erofs/decompressor_zstd.c
index 63a23cac3af4..e8f931d41e60 100644
--- a/fs/erofs/decompressor_zstd.c
+++ b/fs/erofs/decompressor_zstd.c
@@ -72,7 +72,7 @@ int __init z_erofs_zstd_init(void)
return 0;
}

-int z_erofs_load_zstd_config(struct super_block *sb,
+static int z_erofs_load_zstd_config(struct super_block *sb,
struct erofs_super_block *dsb, void *data, int size)
{
static DEFINE_MUTEX(zstd_resize_mutex);
@@ -135,8 +135,8 @@ int z_erofs_load_zstd_config(struct super_block *sb,
return strm ? -ENOMEM : 0;
}

-int z_erofs_zstd_decompress(struct z_erofs_decompress_req *rq,
- struct page **pgpl)
+static int z_erofs_zstd_decompress(struct z_erofs_decompress_req *rq,
+ struct page **pgpl)
{
const unsigned int nrpages_out =
PAGE_ALIGN(rq->pageofs_out + rq->outputsize) >> PAGE_SHIFT;
@@ -277,3 +277,9 @@ int z_erofs_zstd_decompress(struct z_erofs_decompress_req *rq,
wake_up(&z_erofs_zstd_wq);
return err;
}
+
+const struct z_erofs_decompressor z_erofs_zstd_decomp = {
+ .config = z_erofs_load_zstd_config,
+ .decompress = z_erofs_zstd_decompress,
+ .name = "zstd",
+};
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index d6fe002a4a71..40ad9c80433e 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -1221,7 +1221,7 @@ static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be,
struct z_erofs_pcluster *pcl = be->pcl;
unsigned int pclusterpages = z_erofs_pclusterpages(pcl);
const struct z_erofs_decompressor *decomp =
- &erofs_decompressors[pcl->algorithmformat];
+ z_erofs_decomp[pcl->algorithmformat];
int i, err2;
struct page *page;
bool overlapped;
--
2.43.5

Next message: Gao Xiang: "[PATCH 2/3] erofs: refine z_erofs_{init,exit}_subsystem()"
Previous message: Lee Jones: "Re: [PATCH v2 0/6] mfd: tmio: simplify header and move to platform_data"
Next in thread: Gao Xiang: "[PATCH 2/3] erofs: refine z_erofs_{init,exit}_subsystem()"
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