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authorMel Gorman <mgorman@techsingularity.net>2016-03-15 14:55:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-15 16:55:16 -0700
commit32b635298ff4e991d8d8f64dc23782b02eec29c3 (patch)
tree0ef68aa7b2f91f3de5a73b203db6c99e00d2adac /mm
parent07061aab2f750bbf61337b922aa8a245b5da85e1 (diff)
downloadlinux-32b635298ff4e991d8d8f64dc23782b02eec29c3.tar.bz2
mm: filemap: remove redundant code in do_read_cache_page
do_read_cache_page and __read_cache_page duplicate page filler code when filling the page for the first time. This patch simply removes the duplicate logic. Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/filemap.c43
1 files changed, 12 insertions, 31 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index da7a35d83de7..deae0b9ad90b 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2303,7 +2303,7 @@ static struct page *wait_on_page_read(struct page *page)
return page;
}
-static struct page *__read_cache_page(struct address_space *mapping,
+static struct page *do_read_cache_page(struct address_space *mapping,
pgoff_t index,
int (*filler)(void *, struct page *),
void *data,
@@ -2325,31 +2325,19 @@ repeat:
/* Presumably ENOMEM for radix tree node */
return ERR_PTR(err);
}
+
+filler:
err = filler(data, page);
if (err < 0) {
page_cache_release(page);
- page = ERR_PTR(err);
- } else {
- page = wait_on_page_read(page);
+ return ERR_PTR(err);
}
- }
- return page;
-}
-
-static struct page *do_read_cache_page(struct address_space *mapping,
- pgoff_t index,
- int (*filler)(void *, struct page *),
- void *data,
- gfp_t gfp)
-
-{
- struct page *page;
- int err;
-retry:
- page = __read_cache_page(mapping, index, filler, data, gfp);
- if (IS_ERR(page))
- return page;
+ page = wait_on_page_read(page);
+ if (IS_ERR(page))
+ return page;
+ goto out;
+ }
if (PageUptodate(page))
goto out;
@@ -2357,21 +2345,14 @@ retry:
if (!page->mapping) {
unlock_page(page);
page_cache_release(page);
- goto retry;
+ goto repeat;
}
if (PageUptodate(page)) {
unlock_page(page);
goto out;
}
- err = filler(data, page);
- if (err < 0) {
- page_cache_release(page);
- return ERR_PTR(err);
- } else {
- page = wait_on_page_read(page);
- if (IS_ERR(page))
- return page;
- }
+ goto filler;
+
out:
mark_page_accessed(page);
return page;