diff options
Diffstat (limited to 'fs/erofs/zdata.h')
| -rw-r--r-- | fs/erofs/zdata.h | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/fs/erofs/zdata.h b/fs/erofs/zdata.h index 58053bb5066f..f8daadb19e37 100644 --- a/fs/erofs/zdata.h +++ b/fs/erofs/zdata.h @@ -21,6 +21,21 @@ */ typedef void *z_erofs_next_pcluster_t; +struct z_erofs_bvec { + struct page *page; + int offset; + unsigned int end; +}; + +#define __Z_EROFS_BVSET(name, total) \ +struct name { \ + /* point to the next page which contains the following bvecs */ \ + struct page *nextpage; \ + struct z_erofs_bvec bvec[total]; \ +} +__Z_EROFS_BVSET(z_erofs_bvset,); +__Z_EROFS_BVSET(z_erofs_bvset_inline, Z_EROFS_NR_INLINE_PAGEVECS); + /* * Structure fields follow one of the following exclusion rules. * @@ -41,22 +56,25 @@ struct z_erofs_pcluster { /* A: lower limit of decompressed length and if full length or not */ unsigned int length; + /* L: total number of bvecs */ + unsigned int vcnt; + /* I: page offset of start position of decompression */ unsigned short pageofs_out; /* I: page offset of inline compressed data */ unsigned short pageofs_in; - /* L: maximum relative page index in pagevec[] */ + /* L: maximum relative page index in bvecs */ unsigned short nr_pages; - /* L: total number of pages in pagevec[] */ - unsigned int vcnt; - union { /* L: inline a certain number of pagevecs for bootstrap */ erofs_vtptr_t pagevec[Z_EROFS_NR_INLINE_PAGEVECS]; + /* L: inline a certain number of bvec for bootstrap */ + struct z_erofs_bvset_inline bvset; + /* I: can be used to free the pcluster by RCU. */ struct rcu_head rcu; }; |