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authorChristian Brauner <brauner@kernel.org>2022-09-23 11:29:39 +0300
committerChristian Brauner (Microsoft) <brauner@kernel.org>2022-10-19 13:55:42 +0300
commit138060ba92b3b0d77c8e6818d0f33398b23ea42e (patch)
tree82d393e9d98a1910cb5cc01b465097409694c1b2 /fs/orangefs
parent4053d2500beb0ca1e0757665af9e31da249a7a52 (diff)
downloadlinux-138060ba92b3b0d77c8e6818d0f33398b23ea42e.tar.xz
fs: pass dentry to set acl method
The current way of setting and getting posix acls through the generic xattr interface is error prone and type unsafe. The vfs needs to interpret and fixup posix acls before storing or reporting it to userspace. Various hacks exist to make this work. The code is hard to understand and difficult to maintain in it's current form. Instead of making this work by hacking posix acls through xattr handlers we are building a dedicated posix acl api around the get and set inode operations. This removes a lot of hackiness and makes the codepaths easier to maintain. A lot of background can be found in [1]. Since some filesystem rely on the dentry being available to them when setting posix acls (e.g., 9p and cifs) they cannot rely on set acl inode operation. But since ->set_acl() is required in order to use the generic posix acl xattr handlers filesystems that do not implement this inode operation cannot use the handler and need to implement their own dedicated posix acl handlers. Update the ->set_acl() inode method to take a dentry argument. This allows all filesystems to rely on ->set_acl(). As far as I can tell all codepaths can be switched to rely on the dentry instead of just the inode. Note that the original motivation for passing the dentry separate from the inode instead of just the dentry in the xattr handlers was because of security modules that call security_d_instantiate(). This hook is called during d_instantiate_new(), d_add(), __d_instantiate_anon(), and d_splice_alias() to initialize the inode's security context and possibly to set security.* xattrs. Since this only affects security.* xattrs this is completely irrelevant for posix acls. Link: https://lore.kernel.org/all/20220801145520.1532837-1-brauner@kernel.org [1] Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Diffstat (limited to 'fs/orangefs')
-rw-r--r--fs/orangefs/acl.c5
-rw-r--r--fs/orangefs/inode.c7
-rw-r--r--fs/orangefs/orangefs-kernel.h4
3 files changed, 9 insertions, 7 deletions
diff --git a/fs/orangefs/acl.c b/fs/orangefs/acl.c
index 0e2db840c217..c5da2091cefb 100644
--- a/fs/orangefs/acl.c
+++ b/fs/orangefs/acl.c
@@ -118,12 +118,13 @@ out:
return error;
}
-int orangefs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+int orangefs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry,
struct posix_acl *acl, int type)
{
int error;
struct iattr iattr;
int rc;
+ struct inode *inode = d_inode(dentry);
memset(&iattr, 0, sizeof iattr);
@@ -152,7 +153,7 @@ int orangefs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
rc = __orangefs_set_acl(inode, acl, type);
if (!rc && (iattr.ia_valid == ATTR_MODE))
- rc = __orangefs_setattr_mode(inode, &iattr);
+ rc = __orangefs_setattr_mode(dentry, &iattr);
return rc;
}
diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c
index 35788cde6d24..825872d8d377 100644
--- a/fs/orangefs/inode.c
+++ b/fs/orangefs/inode.c
@@ -833,14 +833,15 @@ out:
return ret;
}
-int __orangefs_setattr_mode(struct inode *inode, struct iattr *iattr)
+int __orangefs_setattr_mode(struct dentry *dentry, struct iattr *iattr)
{
int ret;
+ struct inode *inode = d_inode(dentry);
ret = __orangefs_setattr(inode, iattr);
/* change mode on a file that has ACLs */
if (!ret && (iattr->ia_valid & ATTR_MODE))
- ret = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
+ ret = posix_acl_chmod(&init_user_ns, dentry, inode->i_mode);
return ret;
}
@@ -856,7 +857,7 @@ int orangefs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
ret = setattr_prepare(&init_user_ns, dentry, iattr);
if (ret)
goto out;
- ret = __orangefs_setattr_mode(d_inode(dentry), iattr);
+ ret = __orangefs_setattr_mode(dentry, iattr);
sync_inode_metadata(d_inode(dentry), 1);
out:
gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n",
diff --git a/fs/orangefs/orangefs-kernel.h b/fs/orangefs/orangefs-kernel.h
index 3298b15684b7..55cd6d50eea1 100644
--- a/fs/orangefs/orangefs-kernel.h
+++ b/fs/orangefs/orangefs-kernel.h
@@ -107,7 +107,7 @@ extern const struct xattr_handler *orangefs_xattr_handlers[];
extern struct posix_acl *orangefs_get_acl(struct inode *inode, int type, bool rcu);
extern int orangefs_set_acl(struct user_namespace *mnt_userns,
- struct inode *inode, struct posix_acl *acl,
+ struct dentry *dentry, struct posix_acl *acl,
int type);
int __orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
@@ -361,7 +361,7 @@ struct inode *orangefs_new_inode(struct super_block *sb,
struct orangefs_object_kref *ref);
int __orangefs_setattr(struct inode *, struct iattr *);
-int __orangefs_setattr_mode(struct inode *inode, struct iattr *iattr);
+int __orangefs_setattr_mode(struct dentry *dentry, struct iattr *iattr);
int orangefs_setattr(struct user_namespace *, struct dentry *, struct iattr *);
int orangefs_getattr(struct user_namespace *mnt_userns, const struct path *path,