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 cc3ddee97cff034cea4d095de4a484c92a219bf5 Mon Sep 17 00:00:00 2001
From: Hans de Goede hdegoede@redhat.com Date: Thu, 21 Jan 2021 10:08:59 +0100 Subject: [PATCH] vboxsf: Honor excl flag to the dir-inode create op
Honor the excl flag to the dir-inode create op, instead of behaving as if it is always set.
Note the old behavior still worked most of the time since a non-exclusive open only calls the create op, if there is a race and the file is created between the dentry lookup and the calling of the create call.
While at it change the type of the is_dir parameter to the vboxsf_dir_create() helper from an int to a bool, to be consistent with the use of bool for the excl parameter.
Fixes: 0fd169576648 ("fs: Add VirtualBox guest shared folder (vboxsf) support") Signed-off-by: Hans de Goede hdegoede@redhat.com
diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c index eac6788fc6cf..6ff84343edca 100644 --- a/fs/vboxsf/dir.c +++ b/fs/vboxsf/dir.c @@ -253,7 +253,7 @@ static int vboxsf_dir_instantiate(struct inode *parent, struct dentry *dentry, }
static int vboxsf_dir_create(struct inode *parent, struct dentry *dentry, - umode_t mode, int is_dir) + umode_t mode, bool is_dir, bool excl) { struct vboxsf_inode *sf_parent_i = VBOXSF_I(parent); struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb); @@ -261,10 +261,12 @@ static int vboxsf_dir_create(struct inode *parent, struct dentry *dentry, int err;
params.handle = SHFL_HANDLE_NIL; - params.create_flags = SHFL_CF_ACT_CREATE_IF_NEW | - SHFL_CF_ACT_FAIL_IF_EXISTS | - SHFL_CF_ACCESS_READWRITE | - (is_dir ? SHFL_CF_DIRECTORY : 0); + params.create_flags = SHFL_CF_ACT_CREATE_IF_NEW | SHFL_CF_ACCESS_READWRITE; + if (is_dir) + params.create_flags |= SHFL_CF_DIRECTORY; + if (excl) + params.create_flags |= SHFL_CF_ACT_FAIL_IF_EXISTS; + params.info.attr.mode = (mode & 0777) | (is_dir ? SHFL_TYPE_DIRECTORY : SHFL_TYPE_FILE); params.info.attr.additional = SHFLFSOBJATTRADD_NOTHING; @@ -292,14 +294,14 @@ static int vboxsf_dir_mkfile(struct user_namespace *mnt_userns, struct inode *parent, struct dentry *dentry, umode_t mode, bool excl) { - return vboxsf_dir_create(parent, dentry, mode, 0); + return vboxsf_dir_create(parent, dentry, mode, false, excl); }
static int vboxsf_dir_mkdir(struct user_namespace *mnt_userns, struct inode *parent, struct dentry *dentry, umode_t mode) { - return vboxsf_dir_create(parent, dentry, mode, 1); + return vboxsf_dir_create(parent, dentry, mode, true, true); }
static int vboxsf_dir_unlink(struct inode *parent, struct dentry *dentry)