Make ondemand_readahead() take a readahead_control struct in preparation for making do_sync_mmap_readahead() pass down an RAC struct.
Signed-off-by: David Howells <[email protected]> --- mm/readahead.c | 32 ++++++++++++++++++-------------- 1 file changed, 18 insertions(+), 14 deletions(-) diff --git a/mm/readahead.c b/mm/readahead.c index 91859e6e2b7d..e3e3419dfe3d 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -511,14 +511,14 @@ static bool page_cache_readahead_order(struct readahead_control *rac, /* * A minimal readahead algorithm for trivial sequential/random reads. */ -static void ondemand_readahead(struct address_space *mapping, - struct file_ra_state *ra, struct file *file, - struct page *page, pgoff_t index, unsigned long req_size) +static void ondemand_readahead(struct readahead_control *rac, + struct file_ra_state *ra, + struct page *page, unsigned long req_size) { - DEFINE_READAHEAD(rac, file, mapping, index); - struct backing_dev_info *bdi = inode_to_bdi(mapping->host); + struct backing_dev_info *bdi = inode_to_bdi(rac->mapping->host); unsigned long max_pages = ra->ra_pages; unsigned long add_pages; + unsigned long index = rac->_index; pgoff_t prev_index; /* @@ -556,7 +556,7 @@ static void ondemand_readahead(struct address_space *mapping, pgoff_t start; rcu_read_lock(); - start = page_cache_next_miss(mapping, index + 1, max_pages); + start = page_cache_next_miss(rac->mapping, index + 1, max_pages); rcu_read_unlock(); if (!start || start - index > max_pages) @@ -589,14 +589,14 @@ static void ondemand_readahead(struct address_space *mapping, * Query the page cache and look for the traces(cached history pages) * that a sequential stream would leave behind. */ - if (try_context_readahead(mapping, ra, index, req_size, max_pages)) + if (try_context_readahead(rac->mapping, ra, index, req_size, max_pages)) goto readit; /* * standalone, small random read * Read as is, and do not pollute the readahead state. */ - __do_page_cache_readahead(&rac, req_size, 0); + __do_page_cache_readahead(rac, req_size, 0); return; initial_readahead: @@ -622,10 +622,10 @@ static void ondemand_readahead(struct address_space *mapping, } } - rac._index = ra->start; - if (page && page_cache_readahead_order(&rac, ra, thp_order(page))) + rac->_index = ra->start; + if (page && page_cache_readahead_order(rac, ra, thp_order(page))) return; - __do_page_cache_readahead(&rac, ra->size, ra->async_size); + __do_page_cache_readahead(rac, ra->size, ra->async_size); } /** @@ -645,6 +645,8 @@ void page_cache_sync_readahead(struct address_space *mapping, struct file_ra_state *ra, struct file *filp, pgoff_t index, unsigned long req_count) { + DEFINE_READAHEAD(rac, filp, mapping, index); + /* no read-ahead */ if (!ra->ra_pages) return; @@ -659,7 +661,7 @@ void page_cache_sync_readahead(struct address_space *mapping, } /* do read-ahead */ - ondemand_readahead(mapping, ra, filp, NULL, index, req_count); + ondemand_readahead(&rac, ra, NULL, req_count); } EXPORT_SYMBOL_GPL(page_cache_sync_readahead); @@ -683,7 +685,9 @@ page_cache_async_readahead(struct address_space *mapping, struct page *page, pgoff_t index, unsigned long req_count) { - /* no read-ahead */ + DEFINE_READAHEAD(rac, filp, mapping, index); + + /* No Read-ahead */ if (!ra->ra_pages) return; @@ -705,7 +709,7 @@ page_cache_async_readahead(struct address_space *mapping, return; /* do read-ahead */ - ondemand_readahead(mapping, ra, filp, page, index, req_count); + ondemand_readahead(&rac, ra, page, req_count); } EXPORT_SYMBOL_GPL(page_cache_async_readahead);
