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| author |   Gao Xiang <gaoxiang25@huawei.com> | 2018-07-26 20:22:07 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-27 17:24:10 +0200 |
| commit | 105d4ad857dcbf3dc1288f339c5b09dafbc8f923 (patch) | |
| tree | 1024b2a9b33a67d7a2a483cfe6e48c478c23e7e3 /drivers/staging/erofs/internal.h | |
| parent | staging: erofs: introduce VLE decompression support (diff) | |
| download | linux-dev-105d4ad857dcbf3dc1288f339c5b09dafbc8f923.tar.xz linux-dev-105d4ad857dcbf3dc1288f339c5b09dafbc8f923.zip | |
staging: erofs: introduce cached decompression
This patch adds an optional choice which can be
enabled by users in order to cache both incomplete
ends of compressed clusters as a complement to
the in-place decompression in order to boost random
read, but it costs more memory than the in-place
decompression only.
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/erofs/internal.h')
| -rw-r--r-- | drivers/staging/erofs/internal.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h index 3adec7d95d3e..669f93ae6920 100644 --- a/drivers/staging/erofs/internal.h +++ b/drivers/staging/erofs/internal.h @@ -58,6 +58,18 @@ struct erofs_fault_info { }; #endif +#ifdef CONFIG_EROFS_FS_ZIP_CACHE_BIPOLAR +#define EROFS_FS_ZIP_CACHE_LVL (2) +#elif defined(EROFS_FS_ZIP_CACHE_UNIPOLAR) +#define EROFS_FS_ZIP_CACHE_LVL (1) +#else +#define EROFS_FS_ZIP_CACHE_LVL (0) +#endif + +#if (!defined(EROFS_FS_HAS_MANAGED_CACHE) && (EROFS_FS_ZIP_CACHE_LVL > 0)) +#define EROFS_FS_HAS_MANAGED_CACHE +#endif + /* EROFS_SUPER_MAGIC_V1 to represent the whole file system */ #define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1 @@ -82,6 +94,11 @@ struct erofs_sb_info { /* the dedicated workstation for compression */ struct radix_tree_root workstn_tree; + +#ifdef EROFS_FS_HAS_MANAGED_CACHE + struct inode *managed_cache; +#endif + #endif u32 build_time_nsec; @@ -240,6 +257,15 @@ static inline void erofs_workstation_cleanup_all(struct super_block *sb) erofs_shrink_workstation(EROFS_SB(sb), ~0UL, true); } +#ifdef EROFS_FS_HAS_MANAGED_CACHE +#define EROFS_UNALLOCATED_CACHED_PAGE ((void *)0x5F0EF00D) + +extern int try_to_free_all_cached_pages(struct erofs_sb_info *sbi, + struct erofs_workgroup *egrp); +extern int try_to_free_cached_page(struct address_space *mapping, + struct page *page); +#endif + #endif /* we strictly follow PAGE_SIZE and no buffer head yet */ |