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authorAl Viro <viro@zeniv.linux.org.uk>2016-07-05 16:49:21 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2016-07-05 23:02:31 +0300
commitc94c09535c4debcc439f55b5b6d9ebe57bd4665a (patch)
treed5f68cb191a2094d9dc5595a61079e0527f258a3 /fs
parent00699ad8571afd7fb8bc2c61f67c86c2428680ab (diff)
downloadlinux-c94c09535c4debcc439f55b5b6d9ebe57bd4665a.tar.xz
nfs_atomic_open(): prevent parallel nfs_lookup() on a negative hashed
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/dir.c28
1 files changed, 25 insertions, 3 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 3d5eb5edbf50..19d93d0cd400 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1485,11 +1485,13 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
struct file *file, unsigned open_flags,
umode_t mode, int *opened)
{
+ DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
struct nfs_open_context *ctx;
struct dentry *res;
struct iattr attr = { .ia_valid = ATTR_OPEN };
struct inode *inode;
unsigned int lookup_flags = 0;
+ bool switched = false;
int err;
/* Expect a negative dentry */
@@ -1528,6 +1530,17 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
attr.ia_size = 0;
}
+ if (!(open_flags & O_CREAT) && !d_in_lookup(dentry)) {
+ d_drop(dentry);
+ switched = true;
+ dentry = d_alloc_parallel(dentry->d_parent,
+ &dentry->d_name, &wq);
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
+ if (unlikely(!d_in_lookup(dentry)))
+ return finish_no_open(file, dentry);
+ }
+
ctx = create_nfs_open_context(dentry, open_flags);
err = PTR_ERR(ctx);
if (IS_ERR(ctx))
@@ -1563,14 +1576,23 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
trace_nfs_atomic_open_exit(dir, ctx, open_flags, err);
put_nfs_open_context(ctx);
out:
+ if (unlikely(switched)) {
+ d_lookup_done(dentry);
+ dput(dentry);
+ }
return err;
no_open:
res = nfs_lookup(dir, dentry, lookup_flags);
- err = PTR_ERR(res);
+ if (switched) {
+ d_lookup_done(dentry);
+ if (!res)
+ res = dentry;
+ else
+ dput(dentry);
+ }
if (IS_ERR(res))
- goto out;
-
+ return PTR_ERR(res);
return finish_no_open(file, res);
}
EXPORT_SYMBOL_GPL(nfs_atomic_open);