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Subject[PATCH 06/14] readahead: call scheme: cleanup
Merge two similar page_cache_readahead_adaptive() calls into one.

No behavior change.

Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
---
mm/filemap.c | 18 ++++++------------
1 file changed, 6 insertions(+), 12 deletions(-)
--- linux-2.6.21-rc3-mm2.orig/mm/filemap.c
+++ linux-2.6.21-rc3-mm2/mm/filemap.c
@@ -934,17 +934,13 @@ void do_generic_mapping_read(struct addr
find_page:
page = find_get_page(mapping, index);
if (prefer_adaptive_readahead()) {
- if (unlikely(page == NULL)) {
- ra.prev_page = prev_index;
- page_cache_readahead_adaptive(mapping,
- &ra, filp, NULL,
- index, last_index - index);
- page = find_get_page(mapping, index);
- } else if (PageReadahead(page)) {
+ if (!page || PageReadahead(page)) {
ra.prev_page = prev_index;
page_cache_readahead_adaptive(mapping,
&ra, filp, page,
index, last_index - index);
+ if (!page)
+ page = find_get_page(mapping, index);
}
}
if (unlikely(page == NULL)) {
@@ -1394,13 +1390,11 @@ struct page *filemap_fault(struct vm_are
retry_find:
page = find_lock_page(mapping, fdata->pgoff);
if (prefer_adaptive_readahead() && VM_SequentialReadHint(vma)) {
- if (!page) {
- page_cache_readahead_adaptive(mapping, ra, file, NULL,
- fdata->pgoff, 1);
- page = find_lock_page(mapping, fdata->pgoff);
- } else if (PageReadahead(page)) {
+ if (!page || PageReadahead(page)) {
page_cache_readahead_adaptive(mapping, ra, file, page,
fdata->pgoff, 1);
+ if (!page)
+ page = find_lock_page(mapping, fdata->pgoff);
}
}
if (!page) {
--
-
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