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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/ecryptfs | |
| parent | 714b8171af9c930a59a0da8f6fe50518e70ab035 (diff) | |
| download | linux-6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2.tar.gz linux-6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2.tar.bz2 linux-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/ecryptfs')
| -rw-r--r-- | fs/ecryptfs/mmap.c | 11 |
1 files changed, 1 insertions, 10 deletions
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c index b731b09499cb..0770c4b66f53 100644 --- a/fs/ecryptfs/mmap.c +++ b/fs/ecryptfs/mmap.c @@ -46,7 +46,6 @@ struct kmem_cache *ecryptfs_lower_page_cache; */ static struct page *ecryptfs_get1page(struct file *file, int index) { - struct page *page; struct dentry *dentry; struct inode *inode; struct address_space *mapping; @@ -54,14 +53,7 @@ static struct page *ecryptfs_get1page(struct file *file, int index) dentry = file->f_path.dentry; inode = dentry->d_inode; mapping = inode->i_mapping; - page = read_cache_page(mapping, index, - (filler_t *)mapping->a_ops->readpage, - (void *)file); - if (IS_ERR(page)) - goto out; - wait_on_page_locked(page); -out: - return page; + return read_mapping_page(mapping, index, (void *)file); } static @@ -233,7 +225,6 @@ int ecryptfs_do_readpage(struct file *file, struct page *page, ecryptfs_printk(KERN_ERR, "Error reading from page cache\n"); goto out; } - wait_on_page_locked(lower_page); page_data = kmap_atomic(page, KM_USER0); lower_page_data = kmap_atomic(lower_page, KM_USER1); memcpy(page_data, lower_page_data, PAGE_CACHE_SIZE); |