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 eac6788..6ff8434 100644 (file)
--- 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)