In prep for the following support for readahead for page cache sharing, add support for readahead in meta routine.
Signed-off-by: Jingbo Xu <[email protected]> --- fs/erofs/fscache.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index 014e20962376..e2ebe8f7dbe9 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -193,6 +193,30 @@ static int erofs_fscache_meta_read_folio(struct file *data, struct folio *folio) return ret; } +static void erofs_fscache_meta_readahead(struct readahead_control *rac) +{ + int ret; + struct erofs_fscache *ctx = rac->mapping->host->i_private; + struct erofs_fscache_request *req; + + if (!readahead_count(rac)) + return; + + req = erofs_fscache_req_alloc(rac->mapping, + readahead_pos(rac), readahead_length(rac)); + if (IS_ERR(req)) + return; + + /* The request completion will drop refs on the folios. */ + while (readahead_folio(rac)) + ; + + ret = erofs_fscache_read_folios_async(ctx->cookie, req, req->start, req->len); + if (ret) + req->error = ret; + erofs_fscache_req_put(req); +} + static int erofs_fscache_data_read_slice(struct erofs_fscache_request *primary) { struct address_space *mapping = primary->mapping; @@ -319,6 +343,7 @@ static void erofs_fscache_readahead(struct readahead_control *rac) static const struct address_space_operations erofs_fscache_meta_aops = { .read_folio = erofs_fscache_meta_read_folio, + .readahead = erofs_fscache_meta_readahead, }; const struct address_space_operations erofs_fscache_access_aops = { -- 2.19.1.6.gb485710b
