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| author | Nick Piggin <npiggin@suse.de> | 2007-05-06 14:49:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-07 12:12:51 -0700 |
| commit | 6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2 (patch) | |
| tree | 8bbfe5072279227cc50a941ad4813908082426a1 /fs/cramfs | |
| parent | 714b8171af9c930a59a0da8f6fe50518e70ab035 (diff) | |
| download | lwn-6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2.tar.gz lwn-6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2.zip | |
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/cramfs')
| -rw-r--r-- | fs/cramfs/inode.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c index facd0c89be8f..3d194a2be3f5 100644 --- a/fs/cramfs/inode.c +++ b/fs/cramfs/inode.c @@ -180,7 +180,8 @@ static void *cramfs_read(struct super_block *sb, unsigned int offset, unsigned i struct page *page = NULL; if (blocknr + i < devsize) { - page = read_mapping_page(mapping, blocknr + i, NULL); + page = read_mapping_page_async(mapping, blocknr + i, + NULL); /* synchronous error? */ if (IS_ERR(page)) page = NULL; |