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| author | Gao Xiang <gaoxiang25@huawei.com> | 2019-09-22 18:04:34 +0800 |
|---|---|---|
| committer | Gao Xiang <gaoxiang25@huawei.com> | 2019-10-01 04:54:45 +0800 |
| commit | dc76ea8c1087b5c44235566ed4be2202d21a8504 (patch) | |
| tree | e1a69c8abad8599f4056ece3d13140bc657f52df /fs/erofs | |
| parent | 55252ab72b774119afedfdc6d1f142ffa2a9b818 (diff) | |
| download | linux-stable-dc76ea8c1087b5c44235566ed4be2202d21a8504.tar.gz linux-stable-dc76ea8c1087b5c44235566ed4be2202d21a8504.tar.bz2 linux-stable-dc76ea8c1087b5c44235566ed4be2202d21a8504.zip | |
erofs: fix mis-inplace determination related with noio chain
Fix a recent cleanup patch. noio (bypass) chain is
handled asynchronously against submit chain, therefore
inplace I/O or pagevec cannot be applied to such pages.
Add detailed comment for this as well.
Fixes: 97e86a858bc3 ("staging: erofs: tidy up decompression frontend")
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Link: https://lore.kernel.org/r/20190922100434.229340-1-gaoxiang25@huawei.com
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Diffstat (limited to 'fs/erofs')
| -rw-r--r-- | fs/erofs/zdata.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index 96e34c90f814..fad80c97d247 100644 --- a/fs/erofs/zdata.c +++ b/fs/erofs/zdata.c @@ -575,7 +575,7 @@ static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe, struct erofs_map_blocks *const map = &fe->map; struct z_erofs_collector *const clt = &fe->clt; const loff_t offset = page_offset(page); - bool tight = (clt->mode >= COLLECT_PRIMARY_HOOKED); + bool tight = true; enum z_erofs_cache_alloctype cache_strategy; enum z_erofs_page_type page_type; @@ -628,8 +628,16 @@ restart_now: preload_compressed_pages(clt, MNGD_MAPPING(sbi), cache_strategy, pagepool); - tight &= (clt->mode >= COLLECT_PRIMARY_HOOKED); hitted: + /* + * Ensure the current partial page belongs to this submit chain rather + * than other concurrent submit chains or the noio(bypass) chain since + * those chains are handled asynchronously thus the page cannot be used + * for inplace I/O or pagevec (should be processed in strict order.) + */ + tight &= (clt->mode >= COLLECT_PRIMARY_HOOKED && + clt->mode != COLLECT_PRIMARY_FOLLOWED_NOINPLACE); + cur = end - min_t(unsigned int, offset + end - map->m_la, end); if (!(map->m_flags & EROFS_MAP_MAPPED)) { zero_user_segment(page, cur, end); |