erofs: introduce on-disk lz4 fs configurations
Introduce z_erofs_lz4_cfgs to store all lz4 configurations. Currently it's only max_distance, but will be used for new features later. Link: https://lore.kernel.org/r/20210329012308.28743-4-hsiangkao@aol.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
This commit is contained in:
parent
5d50538fc5
commit
46249cded1
@ -29,9 +29,20 @@ struct z_erofs_decompressor {
|
|||||||
};
|
};
|
||||||
|
|
||||||
int z_erofs_load_lz4_config(struct super_block *sb,
|
int z_erofs_load_lz4_config(struct super_block *sb,
|
||||||
struct erofs_super_block *dsb)
|
struct erofs_super_block *dsb,
|
||||||
|
struct z_erofs_lz4_cfgs *lz4, int size)
|
||||||
{
|
{
|
||||||
u16 distance = le16_to_cpu(dsb->lz4_max_distance);
|
u16 distance;
|
||||||
|
|
||||||
|
if (lz4) {
|
||||||
|
if (size < sizeof(struct z_erofs_lz4_cfgs)) {
|
||||||
|
erofs_err(sb, "invalid lz4 cfgs, size=%u", size);
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
distance = le16_to_cpu(lz4->max_distance);
|
||||||
|
} else {
|
||||||
|
distance = le16_to_cpu(dsb->lz4_max_distance);
|
||||||
|
}
|
||||||
|
|
||||||
EROFS_SB(sb)->lz4.max_distance_pages = distance ?
|
EROFS_SB(sb)->lz4.max_distance_pages = distance ?
|
||||||
DIV_ROUND_UP(distance, PAGE_SIZE) + 1 :
|
DIV_ROUND_UP(distance, PAGE_SIZE) + 1 :
|
||||||
|
@ -200,6 +200,12 @@ enum {
|
|||||||
Z_EROFS_COMPRESSION_MAX
|
Z_EROFS_COMPRESSION_MAX
|
||||||
};
|
};
|
||||||
|
|
||||||
|
/* 14 bytes (+ length field = 16 bytes) */
|
||||||
|
struct z_erofs_lz4_cfgs {
|
||||||
|
__le16 max_distance;
|
||||||
|
u8 reserved[12];
|
||||||
|
} __packed;
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* bit 0 : COMPACTED_2B indexes (0 - off; 1 - on)
|
* bit 0 : COMPACTED_2B indexes (0 - off; 1 - on)
|
||||||
* e.g. for 4k logical cluster size, 4B if compacted 2B is off;
|
* e.g. for 4k logical cluster size, 4B if compacted 2B is off;
|
||||||
|
@ -439,7 +439,8 @@ int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
|
|||||||
int erofs_try_to_free_cached_page(struct address_space *mapping,
|
int erofs_try_to_free_cached_page(struct address_space *mapping,
|
||||||
struct page *page);
|
struct page *page);
|
||||||
int z_erofs_load_lz4_config(struct super_block *sb,
|
int z_erofs_load_lz4_config(struct super_block *sb,
|
||||||
struct erofs_super_block *dsb);
|
struct erofs_super_block *dsb,
|
||||||
|
struct z_erofs_lz4_cfgs *lz4, int len);
|
||||||
#else
|
#else
|
||||||
static inline void erofs_shrinker_register(struct super_block *sb) {}
|
static inline void erofs_shrinker_register(struct super_block *sb) {}
|
||||||
static inline void erofs_shrinker_unregister(struct super_block *sb) {}
|
static inline void erofs_shrinker_unregister(struct super_block *sb) {}
|
||||||
@ -448,9 +449,10 @@ static inline void erofs_exit_shrinker(void) {}
|
|||||||
static inline int z_erofs_init_zip_subsystem(void) { return 0; }
|
static inline int z_erofs_init_zip_subsystem(void) { return 0; }
|
||||||
static inline void z_erofs_exit_zip_subsystem(void) {}
|
static inline void z_erofs_exit_zip_subsystem(void) {}
|
||||||
static inline int z_erofs_load_lz4_config(struct super_block *sb,
|
static inline int z_erofs_load_lz4_config(struct super_block *sb,
|
||||||
struct erofs_super_block *dsb)
|
struct erofs_super_block *dsb,
|
||||||
|
struct z_erofs_lz4_cfgs *lz4, int len)
|
||||||
{
|
{
|
||||||
if (dsb->lz4_max_distance) {
|
if (lz4 || dsb->lz4_max_distance) {
|
||||||
erofs_err(sb, "lz4 algorithm isn't enabled");
|
erofs_err(sb, "lz4 algorithm isn't enabled");
|
||||||
return -EINVAL;
|
return -EINVAL;
|
||||||
}
|
}
|
||||||
|
@ -189,7 +189,7 @@ static int erofs_read_superblock(struct super_block *sb)
|
|||||||
}
|
}
|
||||||
|
|
||||||
/* parse on-disk compression configurations */
|
/* parse on-disk compression configurations */
|
||||||
ret = z_erofs_load_lz4_config(sb, dsb);
|
ret = z_erofs_load_lz4_config(sb, dsb, NULL, 0);
|
||||||
out:
|
out:
|
||||||
kunmap(page);
|
kunmap(page);
|
||||||
put_page(page);
|
put_page(page);
|
||||||
|
Loading…
Reference in New Issue
Block a user