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| author | Gao Xiang <hsiangkao@linux.alibaba.com> | 2022-01-02 12:00:13 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2022-01-04 23:43:23 +0800 |
| commit | fdf80a4793021c2f27953b3075f401a497519ba4 (patch) | |
| tree | 9eb58a2d7154a3d2732f7c3eceb86a68d07e852f /fs/erofs/internal.h | |
| parent | ab92184ff8f12979f3d3dd5ed601ed85770d81ba (diff) | |
| download | linux-fdf80a4793021c2f27953b3075f401a497519ba4.tar.bz2 | |
erofs: introduce meta buffer operations
In order to support subpage and folio for all uncompressed files,
introduce meta buffer descriptors, which can be effectively stored
on stack, in place of meta page operations.
This converts the uncompressed data path to meta buffers.
Link: https://lore.kernel.org/r/20220102040017.51352-2-hsiangkao@linux.alibaba.com
Reviewed-by: Liu Bo <bo.liu@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs/internal.h')
| -rw-r--r-- | fs/erofs/internal.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index fca3747d97be..7053f1c4171d 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -251,6 +251,19 @@ static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) #error erofs cannot be used in this platform #endif +enum erofs_kmap_type { + EROFS_NO_KMAP, /* don't map the buffer */ + EROFS_KMAP, /* use kmap() to map the buffer */ + EROFS_KMAP_ATOMIC, /* use kmap_atomic() to map the buffer */ +}; + +struct erofs_buf { + struct page *page; + void *base; + enum erofs_kmap_type kmap_type; +}; +#define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL }) + #define ROOT_NID(sb) ((sb)->root_nid) #define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ) |