diff --git a/Documentation/filesystems/locking.rst b/Documentation/filesystems/locking.rst
index b95cd4992896..167988321a8c 100644
--- a/Documentation/filesystems/locking.rst
+++ b/Documentation/filesystems/locking.rst
@@ -91,7 +91,7 @@ prototypes::
 	int (*fileattr_set)(const struct mnt_idmap *idmap,
 			    struct dentry *dentry, struct file_kattr *fa);
 	int (*fileattr_get)(struct dentry *dentry, struct file_kattr *fa);
-	struct posix_acl * (*get_acl)(struct mnt_idmap *, struct dentry *, int);
+	struct posix_acl * (*get_acl)(const struct mnt_idmap *, struct dentry *, int);
 	struct offset_ctx *(*get_offset_ctx)(struct inode *inode);
 
 locking rules:
diff --git a/Documentation/filesystems/vfs.rst b/Documentation/filesystems/vfs.rst
index d0dd2be3885b..6adb1061a9b6 100644
--- a/Documentation/filesystems/vfs.rst
+++ b/Documentation/filesystems/vfs.rst
@@ -439,7 +439,7 @@ As of kernel 2.6.22, the following members are defined:
 		int (*atomic_open)(struct inode *, struct dentry *, struct file *,
 				   unsigned open_flag, umode_t create_mode);
 		int (*tmpfile) (struct mnt_idmap *, struct inode *, struct file *, umode_t);
-		struct posix_acl * (*get_acl)(struct mnt_idmap *, struct dentry *, int);
+		struct posix_acl * (*get_acl)(const struct mnt_idmap *, struct dentry *, int);
 	        int (*set_acl)(const struct mnt_idmap *, struct dentry *, struct posix_acl *, int);
 		int (*fileattr_set)(const struct mnt_idmap *idmap,
 				    struct dentry *dentry, struct file_kattr *fa);
diff --git a/fs/9p/acl.c b/fs/9p/acl.c
index d09a41336d0d..c6c7c47d32b9 100644
--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -140,7 +140,7 @@ struct posix_acl *v9fs_iop_get_inode_acl(struct inode *inode, int type, bool rcu
 
 }
 
-struct posix_acl *v9fs_iop_get_acl(struct mnt_idmap *idmap,
+struct posix_acl *v9fs_iop_get_acl(const struct mnt_idmap *idmap,
 				   struct dentry *dentry, int type)
 {
 	struct v9fs_session_info *v9ses;
diff --git a/fs/9p/acl.h b/fs/9p/acl.h
index 7de74704c465..2d1b24abcd3f 100644
--- a/fs/9p/acl.h
+++ b/fs/9p/acl.h
@@ -10,7 +10,7 @@
 int v9fs_get_acl(struct inode *inode, struct p9_fid *fid);
 struct posix_acl *v9fs_iop_get_inode_acl(struct inode *inode, int type,
 				   bool rcu);
-struct posix_acl *v9fs_iop_get_acl(struct mnt_idmap *idmap,
+struct posix_acl *v9fs_iop_get_acl(const struct mnt_idmap *idmap,
 					  struct dentry *dentry, int type);
 int v9fs_iop_set_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 		     struct posix_acl *acl, int type);
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 1e5146485214..bd1187661d6d 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -1090,7 +1090,7 @@ static int ecryptfs_fileattr_set(const struct mnt_idmap *idmap,
 	return rc;
 }
 
-static struct posix_acl *ecryptfs_get_acl(struct mnt_idmap *idmap,
+static struct posix_acl *ecryptfs_get_acl(const struct mnt_idmap *idmap,
 					  struct dentry *dentry, int type)
 {
 	return vfs_get_acl(idmap, ecryptfs_dentry_to_lower(dentry),
diff --git a/fs/fuse/acl.c b/fs/fuse/acl.c
index c3813fff4f27..738abed9a816 100644
--- a/fs/fuse/acl.c
+++ b/fs/fuse/acl.c
@@ -62,7 +62,7 @@ static inline bool fuse_no_acl(const struct fuse_conn *fc,
 	return !fc->posix_acl && (i_user_ns(inode) != &init_user_ns);
 }
 
-struct posix_acl *fuse_get_acl(struct mnt_idmap *idmap,
+struct posix_acl *fuse_get_acl(const struct mnt_idmap *idmap,
 			       struct dentry *dentry, int type)
 {
 	struct inode *inode = d_inode(dentry);
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 561ada21ea86..9bf4c738bd74 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1205,7 +1205,7 @@ extern const struct xattr_handler * const fuse_xattr_handlers[];
 
 struct posix_acl;
 struct posix_acl *fuse_get_inode_acl(struct inode *inode, int type, bool rcu);
-struct posix_acl *fuse_get_acl(struct mnt_idmap *idmap,
+struct posix_acl *fuse_get_acl(const struct mnt_idmap *idmap,
 			       struct dentry *dentry, int type);
 int fuse_set_acl(const struct mnt_idmap *, struct dentry *dentry,
 		 struct posix_acl *acl, int type);
diff --git a/fs/internal.h b/fs/internal.h
index 8ba0a1613d20..8a1c7c05c5a2 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -304,7 +304,7 @@ int may_write_xattr(const struct mnt_idmap *idmap, struct inode *inode);
 #ifdef CONFIG_FS_POSIX_ACL
 int do_set_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 	       const char *acl_name, const void *kvalue, size_t size);
-ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
+ssize_t do_get_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 		   const char *acl_name, void *kvalue, size_t size);
 #else
 static inline int do_set_acl(const struct mnt_idmap *idmap,
@@ -313,7 +313,7 @@ static inline int do_set_acl(const struct mnt_idmap *idmap,
 {
 	return -EOPNOTSUPP;
 }
-static inline ssize_t do_get_acl(struct mnt_idmap *idmap,
+static inline ssize_t do_get_acl(const struct mnt_idmap *idmap,
 				 struct dentry *dentry, const char *acl_name,
 				 void *kvalue, size_t size)
 {
diff --git a/fs/ntfs/ea.c b/fs/ntfs/ea.c
index 063cc15f1626..ed31f0e9f5d2 100644
--- a/fs/ntfs/ea.c
+++ b/fs/ntfs/ea.c
@@ -954,7 +954,7 @@ const struct xattr_handler * const ntfs_xattr_handlers[] = {
 // clang-format on
 
 #ifdef CONFIG_NTFS_FS_POSIX_ACL
-struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
+struct posix_acl *ntfs_get_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 			       int type)
 {
 	struct inode *inode = d_inode(dentry);
diff --git a/fs/ntfs/ea.h b/fs/ntfs/ea.h
index 6d98e7487a2c..690fafe181fb 100644
--- a/fs/ntfs/ea.h
+++ b/fs/ntfs/ea.h
@@ -17,7 +17,7 @@ int ntfs_ea_set_wsl_inode(struct inode *inode, dev_t rdev, __le16 *ea_size,
 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 
 #ifdef CONFIG_NTFS_FS_POSIX_ACL
-struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
+struct posix_acl *ntfs_get_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 			       int type);
 int ntfs_set_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 		 struct posix_acl *acl, int type);
diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h
index 0a5e81d420f0..d89609a17886 100644
--- a/fs/ntfs3/ntfs_fs.h
+++ b/fs/ntfs3/ntfs_fs.h
@@ -963,7 +963,7 @@ unsigned long ntfs_names_hash(const u16 *name, size_t len, const u16 *upcase,
 
 /* globals from xattr.c */
 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
-struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
+struct posix_acl *ntfs_get_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 			       int type);
 int ntfs_set_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 		 struct posix_acl *acl, int type);
diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
index 2d17b80999ca..941d516ab8dd 100644
--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@ -543,7 +543,7 @@ static noinline int ntfs_set_ea(struct inode *inode, const char *name,
 /*
  * ntfs_get_acl - inode_operations::get_acl
  */
-struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
+struct posix_acl *ntfs_get_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 			       int type)
 {
 	struct inode *inode = d_inode(dentry);
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 8b335993bf56..1759221dcad5 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -814,7 +814,7 @@ static inline struct posix_acl *ovl_get_inode_acl(struct inode *inode, int type,
 {
 	return do_ovl_get_acl(&nop_mnt_idmap, inode, type, rcu, true);
 }
-static inline struct posix_acl *ovl_get_acl(struct mnt_idmap *idmap,
+static inline struct posix_acl *ovl_get_acl(const struct mnt_idmap *idmap,
 					    struct dentry *dentry, int type)
 {
 	return do_ovl_get_acl(idmap, d_inode(dentry), type, false, false);
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index cec7fb557278..fe77934ea8f2 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -118,7 +118,7 @@ void forget_all_cached_acls(struct inode *inode)
 }
 EXPORT_SYMBOL(forget_all_cached_acls);
 
-static struct posix_acl *__get_acl(struct mnt_idmap *idmap,
+static struct posix_acl *__get_acl(const struct mnt_idmap *idmap,
 				   struct dentry *dentry, struct inode *inode,
 				   int type)
 {
@@ -1168,7 +1168,7 @@ EXPORT_SYMBOL_GPL(vfs_set_acl);
  *
  * Return: On success POSIX ACLs in VFS format, on error negative errno.
  */
-struct posix_acl *vfs_get_acl(struct mnt_idmap *idmap,
+struct posix_acl *vfs_get_acl(const struct mnt_idmap *idmap,
 			      struct dentry *dentry, const char *acl_name)
 {
 	struct inode *inode = d_inode(dentry);
@@ -1286,7 +1286,7 @@ int do_set_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 	return error;
 }
 
-ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
+ssize_t do_get_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 		   const char *acl_name, void *kvalue, size_t size)
 {
 	ssize_t error;
diff --git a/fs/smb/client/cifsacl.c b/fs/smb/client/cifsacl.c
index 0a05b6b0be5f..084a4460ca19 100644
--- a/fs/smb/client/cifsacl.c
+++ b/fs/smb/client/cifsacl.c
@@ -1867,7 +1867,7 @@ id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 *pnmode,
 	return rc;
 }
 
-struct posix_acl *cifs_get_acl(struct mnt_idmap *idmap,
+struct posix_acl *cifs_get_acl(const struct mnt_idmap *idmap,
 			       struct dentry *dentry, int type)
 {
 #if defined(CONFIG_CIFS_ALLOW_INSECURE_LEGACY) && defined(CONFIG_CIFS_POSIX)
diff --git a/fs/smb/client/cifsproto.h b/fs/smb/client/cifsproto.h
index 565697c233a9..e6beff8aafe0 100644
--- a/fs/smb/client/cifsproto.h
+++ b/fs/smb/client/cifsproto.h
@@ -212,7 +212,7 @@ struct smb_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb,
 struct smb_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb,
 				     const struct cifs_fid *cifsfid,
 				     u32 *pacllen, u32 info);
-struct posix_acl *cifs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
+struct posix_acl *cifs_get_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 			       int type);
 int cifs_set_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 		 struct posix_acl *acl, int type);
diff --git a/fs/xattr.c b/fs/xattr.c
index 758a7ffe3a86..d9f035610f0b 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -787,7 +787,7 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
  * Extended attribute GET operations
  */
 static ssize_t
-do_getxattr(struct mnt_idmap *idmap, struct dentry *d,
+do_getxattr(const struct mnt_idmap *idmap, struct dentry *d,
 	struct kernel_xattr_ctx *ctx)
 {
 	ssize_t error;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9186d9bb2697..9809e7c3aa0d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2026,7 +2026,7 @@ struct inode_operations {
 			   umode_t create_mode);
 	int (*tmpfile) (struct mnt_idmap *, struct inode *,
 			struct file *, umode_t);
-	struct posix_acl *(*get_acl)(struct mnt_idmap *, struct dentry *,
+	struct posix_acl *(*get_acl)(const struct mnt_idmap *, struct dentry *,
 				     int);
 	int (*set_acl)(const struct mnt_idmap *, struct dentry *,
 		       struct posix_acl *, int);
diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h
index 9220fe0c965d..caf500bed993 100644
--- a/include/linux/posix_acl.h
+++ b/include/linux/posix_acl.h
@@ -107,7 +107,7 @@ static inline void cache_no_acl(struct inode *inode)
 
 int vfs_set_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 		const char *acl_name, struct posix_acl *kacl);
-struct posix_acl *vfs_get_acl(struct mnt_idmap *idmap,
+struct posix_acl *vfs_get_acl(const struct mnt_idmap *idmap,
 			      struct dentry *dentry, const char *acl_name);
 int vfs_remove_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
 		   const char *acl_name);
@@ -148,7 +148,7 @@ static inline int vfs_set_acl(const struct mnt_idmap *idmap,
 	return -EOPNOTSUPP;
 }
 
-static inline struct posix_acl *vfs_get_acl(struct mnt_idmap *idmap,
+static inline struct posix_acl *vfs_get_acl(const struct mnt_idmap *idmap,
 					    struct dentry *dentry,
 					    const char *acl_name)
 {