On 4/16/20 8:44 AM, Luis Chamberlain wrote:
On Tue, Apr 14, 2020 at 02:42:55PM +0200, Emanuele Giuseppe Esposito wrote:
aa_mk_null_file is using simple_pin_fs/simple_release_fs with local
variables as arguments, for what would amount to a simple
vfs_kern_mount/mntput pair if everything was inlined. Just use
the normal filesystem API since the reference counting is not needed
here.
*Why* is refcounting not needed here?
The refcount is a local variable and is always 0 on entry and exit, so
it is not necessary to have refcounting across function invocations,
such as what simple_pin_fs and simple_release_fs provide.
Thank you,
Emanuele
Luis
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@xxxxxxxxxx>
---
security/apparmor/apparmorfs.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 280741fc0f5f..828bb1eb77ea 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -2525,14 +2525,14 @@ struct path aa_null;
static int aa_mk_null_file(struct dentry *parent)
{
- struct vfsmount *mount = NULL;
+ struct file_system_type *type = parent->d_sb->s_type;
+ struct vfsmount *mount;
struct dentry *dentry;
struct inode *inode;
- int count = 0;
- int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
- if (error)
- return error;
+ mount = vfs_kern_mount(type, SB_KERNMOUNT, type->name, NULL);
+ if (IS_ERR(mount))
+ return PTR_ERR(mount);
inode_lock(d_inode(parent));
dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
@@ -2561,7 +2561,7 @@ static int aa_mk_null_file(struct dentry *parent)
dput(dentry);
out:
inode_unlock(d_inode(parent));
- simple_release_fs(&mount, &count);
+ mntput(mount);
return error;
}
--
2.25.2
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