From 1442b02b66ad2c568f9d5178b7c3c1287b37e438 Mon Sep 17 00:00:00 2001 From: Jeffle Xu Date: Mon, 25 Apr 2022 20:21:40 +0800 Subject: erofs: implement fscache-based data read for non-inline layout Implement the data plane of reading data from data blobs over fscache for non-inline layout. Signed-off-by: Jeffle Xu Reviewed-by: Gao Xiang Link: https://lore.kernel.org/r/20220425122143.56815-19-jefflexu@linux.alibaba.com Acked-by: Chao Yu Signed-off-by: Gao Xiang --- fs/erofs/fscache.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) (limited to 'fs/erofs/fscache.c') diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index 23d7e862eed8..b3af72af7c88 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -83,10 +83,61 @@ out: return ret; } +static int erofs_fscache_readpage(struct file *file, struct page *page) +{ + struct folio *folio = page_folio(page); + struct inode *inode = folio_mapping(folio)->host; + struct super_block *sb = inode->i_sb; + struct erofs_map_blocks map; + struct erofs_map_dev mdev; + erofs_off_t pos; + loff_t pstart; + int ret; + + DBG_BUGON(folio_size(folio) != EROFS_BLKSIZ); + + pos = folio_pos(folio); + map.m_la = pos; + + ret = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW); + if (ret) + goto out_unlock; + + if (!(map.m_flags & EROFS_MAP_MAPPED)) { + folio_zero_range(folio, 0, folio_size(folio)); + goto out_uptodate; + } + + mdev = (struct erofs_map_dev) { + .m_deviceid = map.m_deviceid, + .m_pa = map.m_pa, + }; + + ret = erofs_map_dev(sb, &mdev); + if (ret) + goto out_unlock; + + pstart = mdev.m_pa + (pos - map.m_la); + ret = erofs_fscache_read_folios(mdev.m_fscache->cookie, + folio_mapping(folio), folio_pos(folio), + folio_size(folio), pstart); + +out_uptodate: + if (!ret) + folio_mark_uptodate(folio); +out_unlock: + folio_unlock(folio); + return ret; +} + static const struct address_space_operations erofs_fscache_meta_aops = { .readpage = erofs_fscache_meta_readpage, }; +const struct address_space_operations erofs_fscache_access_aops = { + .readpage = erofs_fscache_readpage, +}; + int erofs_fscache_register_cookie(struct super_block *sb, struct erofs_fscache **fscache, char *name, bool need_inode) -- cgit v1.2.3-70-g09d2