diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/cachefiles/namei.c | 2 | ||||
| -rw-r--r-- | fs/ecryptfs/inode.c | 4 | ||||
| -rw-r--r-- | fs/namei.c | 42 | ||||
| -rw-r--r-- | fs/nfsd/vfs.c | 2 |
4 files changed, 43 insertions, 7 deletions
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c index f4a08d7fa2f7..31d480c0e046 100644 --- a/fs/cachefiles/namei.c +++ b/fs/cachefiles/namei.c @@ -294,7 +294,7 @@ static int cachefiles_bury_object(struct cachefiles_cache *cache, if (ret < 0) { cachefiles_io_error(cache, "Unlink security error"); } else { - ret = vfs_unlink(dir->d_inode, rep); + ret = vfs_unlink(dir->d_inode, rep, NULL); if (preemptive) cachefiles_mark_object_buried(cache, rep); diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 0f9b66eaa767..dc60b8bd09ec 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -153,7 +153,7 @@ static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, dget(lower_dentry); lower_dir_dentry = lock_parent(lower_dentry); - rc = vfs_unlink(lower_dir_inode, lower_dentry); + rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); if (rc) { printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); goto out_unlock; @@ -208,7 +208,7 @@ ecryptfs_do_create(struct inode *directory_inode, inode = __ecryptfs_get_inode(lower_dentry->d_inode, directory_inode->i_sb); if (IS_ERR(inode)) { - vfs_unlink(lower_dir_dentry->d_inode, lower_dentry); + vfs_unlink(lower_dir_dentry->d_inode, lower_dentry, NULL); goto out_lock; } fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); diff --git a/fs/namei.c b/fs/namei.c index e633a58d4222..67ce331a3ed8 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -3615,7 +3615,25 @@ SYSCALL_DEFINE1(rmdir, const char __user *, pathname) return do_rmdir(AT_FDCWD, pathname); } -int vfs_unlink(struct inode *dir, struct dentry *dentry) +/** + * vfs_unlink - unlink a filesystem object + * @dir: parent directory + * @dentry: victim + * @delegated_inode: returns victim inode, if the inode is delegated. + * + * The caller must hold dir->i_mutex. + * + * If vfs_unlink discovers a delegation, it will return -EWOULDBLOCK and + * return a reference to the inode in delegated_inode. The caller + * should then break the delegation on that inode and retry. Because + * breaking a delegation may take a long time, the caller should drop + * dir->i_mutex before doing so. + * + * Alternatively, a caller may pass NULL for delegated_inode. This may + * be appropriate for callers that expect the underlying filesystem not + * to be NFS exported. + */ +int vfs_unlink(struct inode *dir, struct dentry *dentry, struct inode **delegated_inode) { struct inode *target = dentry->d_inode; int error = may_delete(dir, dentry, 0); @@ -3632,11 +3650,20 @@ int vfs_unlink(struct inode *dir, struct dentry *dentry) else { error = security_inode_unlink(dir, dentry); if (!error) { + error = break_deleg(target, O_WRONLY|O_NONBLOCK); + if (error) { + if (error == -EWOULDBLOCK && delegated_inode) { + *delegated_inode = target; + ihold(target); + } + goto out; + } error = dir->i_op->unlink(dir, dentry); if (!error) dont_mount(dentry); } } +out: mutex_unlock(&target->i_mutex); /* We don't d_delete() NFS sillyrenamed files--they still exist. */ @@ -3661,6 +3688,7 @@ static long do_unlinkat(int dfd, const char __user *pathname) struct dentry *dentry; struct nameidata nd; struct inode *inode = NULL; + struct inode *delegated_inode = NULL; unsigned int lookup_flags = 0; retry: name = user_path_parent(dfd, pathname, &nd, lookup_flags); @@ -3675,7 +3703,7 @@ retry: error = mnt_want_write(nd.path.mnt); if (error) goto exit1; - +retry_deleg: mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); dentry = lookup_hash(&nd); error = PTR_ERR(dentry); @@ -3690,13 +3718,21 @@ retry: error = security_path_unlink(&nd.path, dentry); if (error) goto exit2; - error = vfs_unlink(nd.path.dentry->d_inode, dentry); + error = vfs_unlink(nd.path.dentry->d_inode, dentry, &delegated_inode); exit2: dput(dentry); } mutex_unlock(&nd.path.dentry->d_inode->i_mutex); if (inode) iput(inode); /* truncate the inode here */ + inode = NULL; + if (delegated_inode) { + error = break_deleg(delegated_inode, O_WRONLY); + iput(delegated_inode); + delegated_inode = NULL; + if (!error) + goto retry_deleg; + } mnt_drop_write(nd.path.mnt); exit1: path_put(&nd.path); diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 13886f7f40d5..7a810235d599 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1910,7 +1910,7 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, if (host_err) goto out_put; if (type != S_IFDIR) - host_err = vfs_unlink(dirp, rdentry); + host_err = vfs_unlink(dirp, rdentry, NULL); else host_err = vfs_rmdir(dirp, rdentry); if (!host_err) |