The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 52dfd86aa568e433b24357bb5fc725560f1e22d8 Mon Sep 17 00:00:00 2001
From: Hans de Goede hdegoede@redhat.com Date: Thu, 21 Jan 2021 12:54:18 +0100 Subject: [PATCH] vboxsf: Add support for the atomic_open directory-inode op
Opening a new file is done in 2 steps on regular filesystems:
1. Call the create inode-op on the parent-dir to create an inode to hold the meta-data related to the file. 2. Call the open file-op to get a handle for the file.
vboxsf however does not really use disk-backed inodes because it is based on passing through file-related system-calls through to the hypervisor. So both steps translate to an open(2) call being passed through to the hypervisor. With the handle returned by the first call immediately being closed again.
Making 2 open calls for a single open(..., O_CREATE, ...) calls has 2 problems:
a) It is not really efficient. b) It actually breaks some apps.
An example of b) is doing a git clone inside a vboxsf mount. When git clone tries to create a tempfile to store the pak files which is downloading the following happens:
1. vboxsf_dir_mkfile() gets called with a mode of 0444 and succeeds. 2. vboxsf_file_open() gets called with file->f_flags containing O_RDWR. When the host is a Linux machine this fails because doing a open(..., O_RDWR) on a file which exists and has mode 0444 results in an -EPERM error.
Other network-filesystems and fuse avoid the problem of needing to pass 2 open() calls to the other side by using the atomic_open directory-inode op.
This commit fixes git clone not working inside a vboxsf mount, by adding support for the atomic_open directory-inode op. As an added bonus this should also make opening new files faster.
The atomic_open implementation is modelled after the atomic_open implementations from the 9p and fuse code.
Fixes: 0fd169576648 ("fs: Add VirtualBox guest shared folder (vboxsf) support") Reported-by: Ludovic Pouzenc bugreports@pouzenc.fr Signed-off-by: Hans de Goede hdegoede@redhat.com
diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c index 87d5b2fef592..c4769a9396c5 100644 --- a/fs/vboxsf/dir.c +++ b/fs/vboxsf/dir.c @@ -308,6 +308,53 @@ static int vboxsf_dir_mkdir(struct user_namespace *mnt_userns, return vboxsf_dir_create(parent, dentry, mode, true, true, NULL); }
+static int vboxsf_dir_atomic_open(struct inode *parent, struct dentry *dentry, + struct file *file, unsigned int flags, umode_t mode) +{ + struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb); + struct vboxsf_handle *sf_handle; + struct dentry *res = NULL; + u64 handle; + int err; + + if (d_in_lookup(dentry)) { + res = vboxsf_dir_lookup(parent, dentry, 0); + if (IS_ERR(res)) + return PTR_ERR(res); + + if (res) + dentry = res; + } + + /* Only creates */ + if (!(flags & O_CREAT) || d_really_is_positive(dentry)) + return finish_no_open(file, res); + + err = vboxsf_dir_create(parent, dentry, mode, false, flags & O_EXCL, &handle); + if (err) + goto out; + + sf_handle = vboxsf_create_sf_handle(d_inode(dentry), handle, SHFL_CF_ACCESS_READWRITE); + if (IS_ERR(sf_handle)) { + vboxsf_close(sbi->root, handle); + err = PTR_ERR(sf_handle); + goto out; + } + + err = finish_open(file, dentry, generic_file_open); + if (err) { + /* This also closes the handle passed to vboxsf_create_sf_handle() */ + vboxsf_release_sf_handle(d_inode(dentry), sf_handle); + goto out; + } + + file->private_data = sf_handle; + file->f_mode |= FMODE_CREATED; +out: + dput(res); + return err; +} + static int vboxsf_dir_unlink(struct inode *parent, struct dentry *dentry) { struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb); @@ -428,6 +475,7 @@ const struct inode_operations vboxsf_dir_iops = { .lookup = vboxsf_dir_lookup, .create = vboxsf_dir_mkfile, .mkdir = vboxsf_dir_mkdir, + .atomic_open = vboxsf_dir_atomic_open, .rmdir = vboxsf_dir_unlink, .unlink = vboxsf_dir_unlink, .rename = vboxsf_dir_rename,