Hi Greg,
On Thu, Jul 22, 2021 at 05:31:53PM +0200, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
>
> 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@xxxxxxxxxxxxxxx>.
Here is the backport along with cc3ddee97cff ("vboxsf: Honor excl flag
to the dir-inode create op") which was also in another failed mail.
--
Regards
Sudip
>From 3233e395a642f599315f928ebe12af6bbf079520 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Thu, 21 Jan 2021 10:08:59 +0100
Subject: [PATCH 1/2] vboxsf: Honor excl flag to the dir-inode create op
commit cc3ddee97cff034cea4d095de4a484c92a219bf5 upstream
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@xxxxxxxxxx>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
---
fs/vboxsf/dir.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c
index 4d569f14a8d8..c3e68ad6c0f4 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;
@@ -291,13 +293,13 @@ static int vboxsf_dir_create(struct inode *parent, struct dentry *dentry,
static int vboxsf_dir_mkfile(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 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)
--
2.30.2
>From ee92acd5243cec7687d73f60cdcb239756de9e2a Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Thu, 21 Jan 2021 10:22:27 +0100
Subject: [PATCH 2/2] vboxsf: Make vboxsf_dir_create() return the handle for
the created file
commit ab0c29687bc7a890d1a86ac376b0b0fd78b2d9b6 upstream
Make vboxsf_dir_create() optionally return the vboxsf-handle for
the created file. This is a preparation patch for adding atomic_open
support.
Fixes: 0fd169576648 ("fs: Add VirtualBox guest shared folder (vboxsf) support")
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
---
fs/vboxsf/dir.c | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c
index c3e68ad6c0f4..0664787f2b74 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, bool is_dir, bool excl)
+ umode_t mode, bool is_dir, bool excl, u64 *handle_ret)
{
struct vboxsf_inode *sf_parent_i = VBOXSF_I(parent);
struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
@@ -278,28 +278,32 @@ static int vboxsf_dir_create(struct inode *parent, struct dentry *dentry,
if (params.result != SHFL_FILE_CREATED)
return -EPERM;
- vboxsf_close(sbi->root, params.handle);
-
err = vboxsf_dir_instantiate(parent, dentry, ¶ms.info);
if (err)
- return err;
+ goto out;
/* parent directory access/change time changed */
sf_parent_i->force_restat = 1;
- return 0;
+out:
+ if (err == 0 && handle_ret)
+ *handle_ret = params.handle;
+ else
+ vboxsf_close(sbi->root, params.handle);
+
+ return err;
}
static int vboxsf_dir_mkfile(struct inode *parent, struct dentry *dentry,
umode_t mode, bool excl)
{
- return vboxsf_dir_create(parent, dentry, mode, false, excl);
+ return vboxsf_dir_create(parent, dentry, mode, false, excl, NULL);
}
static int vboxsf_dir_mkdir(struct inode *parent, struct dentry *dentry,
umode_t mode)
{
- return vboxsf_dir_create(parent, dentry, mode, true, true);
+ return vboxsf_dir_create(parent, dentry, mode, true, true, NULL);
}
static int vboxsf_dir_unlink(struct inode *parent, struct dentry *dentry)
--
2.30.2
