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authorNick Piggin <npiggin@suse.de>2007-05-06 14:49:04 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 12:12:51 -0700
commit6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2 (patch)
tree8bbfe5072279227cc50a941ad4813908082426a1 /fs/ntfs/super.c
parent714b8171af9c930a59a0da8f6fe50518e70ab035 (diff)
downloadop-kernel-dev-6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2.zip
op-kernel-dev-6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2.tar.gz
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/ntfs/super.c')
-rw-r--r--fs/ntfs/super.c30
1 files changed, 4 insertions, 26 deletions
diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c
index 1594c90..2ddde53 100644
--- a/fs/ntfs/super.c
+++ b/fs/ntfs/super.c
@@ -2471,7 +2471,6 @@ static s64 get_nr_free_clusters(ntfs_volume *vol)
s64 nr_free = vol->nr_clusters;
u32 *kaddr;
struct address_space *mapping = vol->lcnbmp_ino->i_mapping;
- filler_t *readpage = (filler_t*)mapping->a_ops->readpage;
struct page *page;
pgoff_t index, max_index;
@@ -2494,24 +2493,14 @@ static s64 get_nr_free_clusters(ntfs_volume *vol)
* Read the page from page cache, getting it from backing store
* if necessary, and increment the use count.
*/
- page = read_cache_page(mapping, index, (filler_t*)readpage,
- NULL);
+ page = read_mapping_page(mapping, index, NULL);
/* Ignore pages which errored synchronously. */
if (IS_ERR(page)) {
- ntfs_debug("Sync read_cache_page() error. Skipping "
+ ntfs_debug("read_mapping_page() error. Skipping "
"page (index 0x%lx).", index);
nr_free -= PAGE_CACHE_SIZE * 8;
continue;
}
- wait_on_page_locked(page);
- /* Ignore pages which errored asynchronously. */
- if (!PageUptodate(page)) {
- ntfs_debug("Async read_cache_page() error. Skipping "
- "page (index 0x%lx).", index);
- page_cache_release(page);
- nr_free -= PAGE_CACHE_SIZE * 8;
- continue;
- }
kaddr = (u32*)kmap_atomic(page, KM_USER0);
/*
* For each 4 bytes, subtract the number of set bits. If this
@@ -2562,7 +2551,6 @@ static unsigned long __get_nr_free_mft_records(ntfs_volume *vol,
{
u32 *kaddr;
struct address_space *mapping = vol->mftbmp_ino->i_mapping;
- filler_t *readpage = (filler_t*)mapping->a_ops->readpage;
struct page *page;
pgoff_t index;
@@ -2576,21 +2564,11 @@ static unsigned long __get_nr_free_mft_records(ntfs_volume *vol,
* Read the page from page cache, getting it from backing store
* if necessary, and increment the use count.
*/
- page = read_cache_page(mapping, index, (filler_t*)readpage,
- NULL);
+ page = read_mapping_page(mapping, index, NULL);
/* Ignore pages which errored synchronously. */
if (IS_ERR(page)) {
- ntfs_debug("Sync read_cache_page() error. Skipping "
- "page (index 0x%lx).", index);
- nr_free -= PAGE_CACHE_SIZE * 8;
- continue;
- }
- wait_on_page_locked(page);
- /* Ignore pages which errored asynchronously. */
- if (!PageUptodate(page)) {
- ntfs_debug("Async read_cache_page() error. Skipping "
+ ntfs_debug("read_mapping_page() error. Skipping "
"page (index 0x%lx).", index);
- page_cache_release(page);
nr_free -= PAGE_CACHE_SIZE * 8;
continue;
}
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