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erofs: simplify compression configuration parser 

Move erofs_load_compr_cfgs() into decompressor.c as well as introduce
a callback instead of a hard-coded switch for each algorithm for
simplicity.

Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20231022130957.11398-1-xiang@kernel.org
This commit is contained in:
Gao Xiang 2023-10-22 21:09:57 +08:00
parent 798eecaea0
commit efb4fb02ce
6 changed files with 79 additions and 108 deletions
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6
fs/erofs/compress.h
View File

@ -21,6 +21,8 @@ struct z_erofs_decompress_req {
};
struct z_erofs_decompressor {
int (*config)(struct super_block *sb, struct erofs_super_block *dsb,
void *data, int size);
int (*decompress)(struct z_erofs_decompress_req *rq,
struct page **pagepool);
char *name;
@ -92,6 +94,10 @@ int z_erofs_fixup_insize(struct z_erofs_decompress_req *rq, const char *padbuf,
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_lzma_decompress(struct z_erofs_decompress_req *rq,
struct page **pagepool);
int z_erofs_deflate_decompress(struct z_erofs_decompress_req *rq,

62
fs/erofs/decompressor.c
View File

@ -24,11 +24,11 @@ struct z_erofs_lz4_decompress_ctx {
unsigned int oend;
};
int z_erofs_load_lz4_config(struct super_block *sb,
struct erofs_super_block *dsb,
struct z_erofs_lz4_cfgs *lz4, int size)
static int z_erofs_load_lz4_config(struct super_block *sb,
struct erofs_super_block *dsb, void *data, int size)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
struct z_erofs_lz4_cfgs *lz4 = data;
u16 distance;
if (lz4) {
@ -370,19 +370,75 @@ const struct z_erofs_decompressor erofs_decompressors[] = {
.name = "interlaced"
},
[Z_EROFS_COMPRESSION_LZ4] = {
.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"
},
#endif
#ifdef CONFIG_EROFS_FS_ZIP_DEFLATE
[Z_EROFS_COMPRESSION_DEFLATE] = {
.config = z_erofs_load_deflate_config,
.decompress = z_erofs_deflate_decompress,
.name = "deflate"
},
#endif
};
int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
unsigned int algs, alg;
erofs_off_t offset;
int size, ret = 0;
if (!erofs_sb_has_compr_cfgs(sbi)) {
sbi->available_compr_algs = Z_EROFS_COMPRESSION_LZ4;
return z_erofs_load_lz4_config(sb, dsb, NULL, 0);
}
sbi->available_compr_algs = le16_to_cpu(dsb->u1.available_compr_algs);
if (sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS) {
erofs_err(sb, "unidentified algorithms %x, please upgrade kernel",
sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS);
return -EOPNOTSUPP;
}
erofs_init_metabuf(&buf, sb);
offset = EROFS_SUPER_OFFSET + sbi->sb_size;
alg = 0;
for (algs = sbi->available_compr_algs; algs; algs >>= 1, ++alg) {
void *data;
if (!(algs & 1))
continue;
data = erofs_read_metadata(sb, &buf, &offset, &size);
if (IS_ERR(data)) {
ret = PTR_ERR(data);
break;
}
if (alg >= ARRAY_SIZE(erofs_decompressors) ||
!erofs_decompressors[alg].config) {
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;
}
erofs_put_metabuf(&buf);
return ret;
}

5
fs/erofs/decompressor_deflate.c
View File

@ -77,9 +77,10 @@ out_failed:
}
int z_erofs_load_deflate_config(struct super_block *sb,
struct erofs_super_block *dsb,
struct z_erofs_deflate_cfgs *dfl, int size)
struct erofs_super_block *dsb, void *data, int size)
{
struct z_erofs_deflate_cfgs *dfl = data;
if (!dfl || size < sizeof(struct z_erofs_deflate_cfgs)) {
erofs_err(sb, "invalid deflate cfgs, size=%u", size);
return -EINVAL;

4
fs/erofs/decompressor_lzma.c
View File

@ -72,10 +72,10 @@ int __init z_erofs_lzma_init(void)
}
int z_erofs_load_lzma_config(struct super_block *sb,
struct erofs_super_block *dsb,
struct z_erofs_lzma_cfgs *lzma, int size)
struct erofs_super_block *dsb, void *data, int size)
{
static DEFINE_MUTEX(lzma_resize_mutex);
struct z_erofs_lzma_cfgs *lzma = data;
unsigned int dict_size, i;
struct z_erofs_lzma *strm, *head = NULL;
int err;

38
fs/erofs/internal.h
View File

@ -469,9 +469,6 @@ int __init z_erofs_init_zip_subsystem(void);
void z_erofs_exit_zip_subsystem(void);
int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
struct erofs_workgroup *egrp);
int z_erofs_load_lz4_config(struct super_block *sb,
struct erofs_super_block *dsb,
struct z_erofs_lz4_cfgs *lz4, int len);
int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
int flags);
void *erofs_get_pcpubuf(unsigned int requiredpages);
@ -480,6 +477,7 @@ int erofs_pcpubuf_growsize(unsigned int nrpages);
void __init erofs_pcpubuf_init(void);
void erofs_pcpubuf_exit(void);
int erofs_init_managed_cache(struct super_block *sb);
int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb);
#else
static inline void erofs_shrinker_register(struct super_block *sb) {}
static inline void erofs_shrinker_unregister(struct super_block *sb) {}
@ -487,16 +485,6 @@ static inline int erofs_init_shrinker(void) { return 0; }
static inline void erofs_exit_shrinker(void) {}
static inline int z_erofs_init_zip_subsystem(void) { return 0; }
static inline void z_erofs_exit_zip_subsystem(void) {}
static inline int z_erofs_load_lz4_config(struct super_block *sb,
struct erofs_super_block *dsb,
struct z_erofs_lz4_cfgs *lz4, int len)
{
if (lz4 || dsb->u1.lz4_max_distance) {
erofs_err(sb, "lz4 algorithm isn't enabled");
return -EINVAL;
}
return 0;
}
static inline void erofs_pcpubuf_init(void) {}
static inline void erofs_pcpubuf_exit(void) {}
static inline int erofs_init_managed_cache(struct super_block *sb) { return 0; }
@ -505,41 +493,17 @@ static inline int erofs_init_managed_cache(struct super_block *sb) { return 0; }
#ifdef CONFIG_EROFS_FS_ZIP_LZMA
int __init z_erofs_lzma_init(void);
void z_erofs_lzma_exit(void);
int z_erofs_load_lzma_config(struct super_block *sb,
struct erofs_super_block *dsb,
struct z_erofs_lzma_cfgs *lzma, int size);
#else
static inline int z_erofs_lzma_init(void) { return 0; }
static inline int z_erofs_lzma_exit(void) { return 0; }
static inline int z_erofs_load_lzma_config(struct super_block *sb,
struct erofs_super_block *dsb,
struct z_erofs_lzma_cfgs *lzma, int size) {
if (lzma) {
erofs_err(sb, "lzma algorithm isn't enabled");
return -EINVAL;
}
return 0;
}
#endif /* !CONFIG_EROFS_FS_ZIP_LZMA */
#ifdef CONFIG_EROFS_FS_ZIP_DEFLATE
int __init z_erofs_deflate_init(void);
void z_erofs_deflate_exit(void);
int z_erofs_load_deflate_config(struct super_block *sb,
struct erofs_super_block *dsb,
struct z_erofs_deflate_cfgs *dfl, int size);
#else
static inline int z_erofs_deflate_init(void) { return 0; }
static inline int z_erofs_deflate_exit(void) { return 0; }
static inline int z_erofs_load_deflate_config(struct super_block *sb,
struct erofs_super_block *dsb,
struct z_erofs_deflate_cfgs *dfl, int size) {
if (dfl) {
erofs_err(sb, "deflate algorithm isn't enabled");
return -EINVAL;
}
return 0;
}
#endif /* !CONFIG_EROFS_FS_ZIP_DEFLATE */
#ifdef CONFIG_EROFS_FS_ONDEMAND

72
fs/erofs/super.c
View File

@ -156,68 +156,15 @@ void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
return buffer;
}
#ifdef CONFIG_EROFS_FS_ZIP
static int erofs_load_compr_cfgs(struct super_block *sb,
struct erofs_super_block *dsb)
#ifndef CONFIG_EROFS_FS_ZIP
static int z_erofs_parse_cfgs(struct super_block *sb,
struct erofs_super_block *dsb)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
unsigned int algs, alg;
erofs_off_t offset;
int size, ret = 0;
if (!dsb->u1.available_compr_algs)
return 0;
sbi->available_compr_algs = le16_to_cpu(dsb->u1.available_compr_algs);
if (sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS) {
erofs_err(sb, "try to load compressed fs with unsupported algorithms %x",
sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS);
return -EINVAL;
}
erofs_init_metabuf(&buf, sb);
offset = EROFS_SUPER_OFFSET + sbi->sb_size;
alg = 0;
for (algs = sbi->available_compr_algs; algs; algs >>= 1, ++alg) {
void *data;
if (!(algs & 1))
continue;
data = erofs_read_metadata(sb, &buf, &offset, &size);
if (IS_ERR(data)) {
ret = PTR_ERR(data);
break;
}
switch (alg) {
case Z_EROFS_COMPRESSION_LZ4:
ret = z_erofs_load_lz4_config(sb, dsb, data, size);
break;
case Z_EROFS_COMPRESSION_LZMA:
ret = z_erofs_load_lzma_config(sb, dsb, data, size);
break;
case Z_EROFS_COMPRESSION_DEFLATE:
ret = z_erofs_load_deflate_config(sb, dsb, data, size);
break;
default:
DBG_BUGON(1);
ret = -EFAULT;
}
kfree(data);
if (ret)
break;
}
erofs_put_metabuf(&buf);
return ret;
}
#else
static int erofs_load_compr_cfgs(struct super_block *sb,
struct erofs_super_block *dsb)
{
if (dsb->u1.available_compr_algs) {
erofs_err(sb, "try to load compressed fs when compression is disabled");
return -EINVAL;
}
return 0;
erofs_err(sb, "compression disabled, unable to mount compressed EROFS");
return -EOPNOTSUPP;
}
#endif
@ -406,10 +353,7 @@ static int erofs_read_superblock(struct super_block *sb)
}
/* parse on-disk compression configurations */
if (erofs_sb_has_compr_cfgs(sbi))
ret = erofs_load_compr_cfgs(sb, dsb);
else
ret = z_erofs_load_lz4_config(sb, dsb, NULL, 0);
ret = z_erofs_parse_cfgs(sb, dsb);
if (ret < 0)
goto out;