diff options
author | Jeff Moyer <jmoyer@redhat.com> | 2005-04-16 15:24:05 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:24:05 -0700 |
commit | d345734267dbec642f4e34a9d392d2fd85b5fa9b (patch) | |
tree | 9a74f4b8292a696620f95933171ac5ddff970ef9 /mm | |
parent | 41aac24f8fb5a21ff3d0f6f56f85fad3cf0e88a9 (diff) | |
download | linux-d345734267dbec642f4e34a9d392d2fd85b5fa9b.tar.gz |
[PATCH] filemap_getpage can block when MAP_NONBLOCK specified
We will return NULL from filemap_getpage when a page does not exist in the page cache and MAP_NONBLOCK is specified, here: page = find_get_page(mapping, pgoff); if (!page) { if (nonblock) return NULL; goto no_cached_page; } But we forget to do so when the page in the cache is not uptodate. The following could result in a blocking call: /* * Ok, found a page in the page cache, now we need to check * that it's up-to-date. */ if (!PageUptodate(page)) goto page_not_uptodate; Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/filemap.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 439b2bea8e34..93595c327bbd 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1379,8 +1379,13 @@ retry_find: * Ok, found a page in the page cache, now we need to check * that it's up-to-date. */ - if (!PageUptodate(page)) + if (!PageUptodate(page)) { + if (nonblock) { + page_cache_release(page); + return NULL; + } goto page_not_uptodate; + } success: /* |