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authorNick Piggin <npiggin@suse.de>2007-05-06 17:49:04 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 15:12:51 -0400
commit6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2 (patch)
tree8bbfe5072279227cc50a941ad4813908082426a1 /fs/ext2
parent714b8171af9c930a59a0da8f6fe50518e70ab035 (diff)
mm: make read_cache_page synchronous
Ensure pages are uptodate after returning from read_cache_page, which allows us to cut out most of the filesystem-internal PageUptodate calls. I didn't have a great look down the call chains, but this appears to fixes 7 possible use-before uptodate in hfs, 2 in hfsplus, 1 in jfs, a few in ecryptfs, 1 in jffs2, and a possible cleared data overwritten with readpage in block2mtd. All depending on whether the filler is async and/or can return with a !uptodate page. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext2')
-rw-r--r--fs/ext2/dir.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c
index e89bfc8cf957..1d1e7e30d70e 100644
--- a/fs/ext2/dir.c
+++ b/fs/ext2/dir.c
@@ -161,10 +161,7 @@ static struct page * ext2_get_page(struct inode *dir, unsigned long n)
161 struct address_space *mapping = dir->i_mapping; 161 struct address_space *mapping = dir->i_mapping;
162 struct page *page = read_mapping_page(mapping, n, NULL); 162 struct page *page = read_mapping_page(mapping, n, NULL);
163 if (!IS_ERR(page)) { 163 if (!IS_ERR(page)) {
164 wait_on_page_locked(page);
165 kmap(page); 164 kmap(page);
166 if (!PageUptodate(page))
167 goto fail;
168 if (!PageChecked(page)) 165 if (!PageChecked(page))
169 ext2_check_page(page); 166 ext2_check_page(page);
170 if (PageError(page)) 167 if (PageError(page))