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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/afs | |
| parent | 714b8171af9c930a59a0da8f6fe50518e70ab035 (diff) | |
| download | kernel_samsung_smdk4412-6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2.zip kernel_samsung_smdk4412-6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2.tar.gz kernel_samsung_smdk4412-6fe6900e1e5b6fa9e5c59aa5061f244fe3f467e2.tar.bz2 | |
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/afs')
| -rw-r--r-- | fs/afs/dir.c | 3 | ||||
| -rw-r--r-- | fs/afs/mntpt.c | 11 |
2 files changed, 4 insertions, 10 deletions
diff --git a/fs/afs/dir.c b/fs/afs/dir.c index dac5b99..0c1e902 100644 --- a/fs/afs/dir.c +++ b/fs/afs/dir.c @@ -194,10 +194,7 @@ static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, page = read_mapping_page(dir->i_mapping, index, &file); if (!IS_ERR(page)) { - wait_on_page_locked(page); kmap(page); - if (!PageUptodate(page)) - goto fail; if (!PageChecked(page)) afs_dir_check_page(dir, page); if (PageError(page)) diff --git a/fs/afs/mntpt.c b/fs/afs/mntpt.c index b905ae3..034fcfd 100644 --- a/fs/afs/mntpt.c +++ b/fs/afs/mntpt.c @@ -68,13 +68,11 @@ int afs_mntpt_check_symlink(struct afs_vnode *vnode, struct key *key) } ret = -EIO; - wait_on_page_locked(page); - buf = kmap(page); - if (!PageUptodate(page)) - goto out_free; if (PageError(page)) goto out_free; + buf = kmap(page); + /* examine the symlink's contents */ size = vnode->status.size; _debug("symlink to %*.*s", (int) size, (int) size, buf); @@ -91,8 +89,8 @@ int afs_mntpt_check_symlink(struct afs_vnode *vnode, struct key *key) ret = 0; -out_free: kunmap(page); +out_free: page_cache_release(page); out: _leave(" = %d", ret); @@ -171,8 +169,7 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt) } ret = -EIO; - wait_on_page_locked(page); - if (!PageUptodate(page) || PageError(page)) + if (PageError(page)) goto error; buf = kmap(page); |