[PATCH v3 1/3] fs: rethread notify_change to take a path instead of a dentry

From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: linux-fsdevel@vger.kernel.org
Cc: "David Howells" <dhowells@redhat.com>,
	"Christian Brauner" <christian@brauner.io>,
	"Al Viro" <viro@ZenIV.linux.org.uk>,
	"Miklos Szeredi" <miklos@szeredi.hu>,
	"Seth Forshee" <seth.forshee@canonical.com>,
	linux-unionfs@vger.kernel.org,
	"Amir Goldstein" <amir73il@gmail.com>,
	"Stéphane Graber" <stgraber@ubuntu.com>,
	"Eric Biederman" <ebiederm@xmission.com>,
	"Aleksa Sarai" <cyphar@cyphar.com>,
	"Serge E . Hallyn" <serge@hallyn.com>,
	"Tycho Andersen" <tycho@tycho.ws>,
	containers@lists.linux-foundation.org
Subject: [PATCH v3 1/3] fs: rethread notify_change to take a path instead of a dentry
Date: Mon, 17 Feb 2020 12:53:05 -0800	[thread overview]
Message-ID: <20200217205307.32256-2-James.Bottomley@HansenPartnership.com> (raw)
In-Reply-To: <20200217205307.32256-1-James.Bottomley@HansenPartnership.com>

In order to prepare for implementing shiftfs as a property changing
bind mount, the path (which contains the vfsmount) must be threaded
through everywhere we are going to do either a permission check or an
attribute get/set so that we can arrange for the credentials for the
operation to be based on the bind mount properties rather than those
of current.

Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

---

v2: fix issues found by Amir Goldstein
v3: add reviews
---
 drivers/base/devtmpfs.c   |  8 ++++++--
 fs/attr.c                 |  4 +++-
 fs/cachefiles/interface.c |  6 ++++--
 fs/coredump.c             |  4 ++--
 fs/ecryptfs/inode.c       |  9 ++++++---
 fs/inode.c                |  7 ++++---
 fs/namei.c                |  2 +-
 fs/nfsd/vfs.c             | 13 ++++++++-----
 fs/open.c                 | 19 ++++++++++---------
 fs/overlayfs/copy_up.c    | 40 ++++++++++++++++++++++++----------------
 fs/overlayfs/dir.c        | 10 ++++++++--
 fs/overlayfs/inode.c      |  6 ++++--
 fs/overlayfs/overlayfs.h  |  2 +-
 fs/overlayfs/super.c      |  3 ++-
 fs/utimes.c               |  2 +-
 include/linux/fs.h        |  7 +++----
 16 files changed, 87 insertions(+), 55 deletions(-)

diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index c9017e0584c0..e323b55721a1 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -214,13 +214,17 @@ static int handle_create(const char *nodename, umode_t mode, kuid_t uid,
 	err = vfs_mknod(d_inode(path.dentry), dentry, mode, dev->devt);
 	if (!err) {
 		struct iattr newattrs;
+		struct path newpath = {
+			.mnt = path.mnt,
+			.dentry = dentry,
+		};
 
 		newattrs.ia_mode = mode;
 		newattrs.ia_uid = uid;
 		newattrs.ia_gid = gid;
 		newattrs.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID;
 		inode_lock(d_inode(dentry));
-		notify_change(dentry, &newattrs, NULL);
+		notify_change(&newpath, &newattrs, NULL);
 		inode_unlock(d_inode(dentry));
 
 		/* mark as kernel-created inode */
@@ -327,7 +331,7 @@ static int handle_remove(const char *nodename, struct device *dev)
 			newattrs.ia_valid =
 				ATTR_UID|ATTR_GID|ATTR_MODE;
 			inode_lock(d_inode(dentry));
-			notify_change(dentry, &newattrs, NULL);
+			notify_change(&p, &newattrs, NULL);
 			inode_unlock(d_inode(dentry));
 			err = vfs_unlink(d_inode(parent.dentry), dentry, NULL);
 			if (!err || err == -ENOENT)
diff --git a/fs/attr.c b/fs/attr.c
index b4bbdbd4c8ca..11201ab7e3b1 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -220,8 +220,10 @@ EXPORT_SYMBOL(setattr_copy);
  * the file open for write, as there can be no conflicting delegation in
  * that case.
  */
-int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **delegated_inode)
+int notify_change(const struct path *path, struct iattr * attr,
+		  struct inode **delegated_inode)
 {
+	struct dentry *dentry = path->dentry;
 	struct inode *inode = dentry->d_inode;
 	umode_t mode = inode->i_mode;
 	int error;
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index 4cea5fbf695e..f11216f59a56 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -436,6 +436,7 @@ static int cachefiles_attr_changed(struct fscache_object *_object)
 	uint64_t ni_size;
 	loff_t oi_size;
 	int ret;
+	struct path path;
 
 	ni_size = _object->store_limit_l;
 
@@ -466,18 +467,19 @@ static int cachefiles_attr_changed(struct fscache_object *_object)
 	/* if there's an extension to a partial page at the end of the backing
 	 * file, we need to discard the partial page so that we pick up new
 	 * data after it */
+	path = (struct path){ .mnt = cache->mnt, .dentry = object->backer };
 	if (oi_size & ~PAGE_MASK && ni_size > oi_size) {
 		_debug("discard tail %llx", oi_size);
 		newattrs.ia_valid = ATTR_SIZE;
 		newattrs.ia_size = oi_size & PAGE_MASK;
-		ret = notify_change(object->backer, &newattrs, NULL);
+		ret = notify_change(&path, &newattrs, NULL);
 		if (ret < 0)
 			goto truncate_failed;
 	}
 
 	newattrs.ia_valid = ATTR_SIZE;
 	newattrs.ia_size = ni_size;
-	ret = notify_change(object->backer, &newattrs, NULL);
+	ret = notify_change(&path, &newattrs, NULL);
 
 truncate_failed:
 	inode_unlock(d_inode(object->backer));
diff --git a/fs/coredump.c b/fs/coredump.c
index f8296a82d01d..0334050e27e4 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -775,7 +775,7 @@ void do_coredump(const kernel_siginfo_t *siginfo)
 			goto close_fail;
 		if (!(cprm.file->f_mode & FMODE_CAN_WRITE))
 			goto close_fail;
-		if (do_truncate(cprm.file->f_path.dentry, 0, 0, cprm.file))
+		if (do_truncate(&cprm.file->f_path, 0, 0, cprm.file))
 			goto close_fail;
 	}
 
@@ -879,7 +879,7 @@ void dump_truncate(struct coredump_params *cprm)
 	if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
 		offset = file->f_op->llseek(file, 0, SEEK_CUR);
 		if (i_size_read(file->f_mapping->host) < offset)
-			do_truncate(file->f_path.dentry, offset, 0, file);
+			do_truncate(&file->f_path, offset, 0, file);
 	}
 }
 EXPORT_SYMBOL(dump_truncate);
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index e23752d9a79f..3bc67c478163 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -852,10 +852,11 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 
 	rc = truncate_upper(dentry, &ia, &lower_ia);
 	if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
-		struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
+		struct path *lower_path = ecryptfs_dentry_to_lower_path(dentry);
+		struct dentry *lower_dentry = lower_path->dentry;
 
 		inode_lock(d_inode(lower_dentry));
-		rc = notify_change(lower_dentry, &lower_ia, NULL);
+		rc = notify_change(lower_path, &lower_ia, NULL);
 		inode_unlock(d_inode(lower_dentry));
 	}
 	return rc;
@@ -883,6 +884,7 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 {
 	int rc = 0;
 	struct dentry *lower_dentry;
+	struct path *lower_path;
 	struct iattr lower_ia;
 	struct inode *inode;
 	struct inode *lower_inode;
@@ -897,6 +899,7 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 	inode = d_inode(dentry);
 	lower_inode = ecryptfs_inode_to_lower(inode);
 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
+	lower_path = ecryptfs_dentry_to_lower_path(dentry);
 	mutex_lock(&crypt_stat->cs_mutex);
 	if (d_is_dir(dentry))
 		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
@@ -959,7 +962,7 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 		lower_ia.ia_valid &= ~ATTR_MODE;
 
 	inode_lock(d_inode(lower_dentry));
-	rc = notify_change(lower_dentry, &lower_ia, NULL);
+	rc = notify_change(lower_path, &lower_ia, NULL);
 	inode_unlock(d_inode(lower_dentry));
 out:
 	fsstack_copy_attr_all(inode, lower_inode);
diff --git a/fs/inode.c b/fs/inode.c
index 7d57068b6b7a..be14d3fcbee1 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1821,7 +1821,7 @@ int dentry_needs_remove_privs(struct dentry *dentry)
 	return mask;
 }
 
-static int __remove_privs(struct dentry *dentry, int kill)
+static int __remove_privs(struct path *path, int kill)
 {
 	struct iattr newattrs;
 
@@ -1830,7 +1830,7 @@ static int __remove_privs(struct dentry *dentry, int kill)
 	 * Note we call this on write, so notify_change will not
 	 * encounter any conflicting delegations:
 	 */
-	return notify_change(dentry, &newattrs, NULL);
+	return notify_change(path, &newattrs, NULL);
 }
 
 /*
@@ -1839,6 +1839,7 @@ static int __remove_privs(struct dentry *dentry, int kill)
  */
 int file_remove_privs(struct file *file)
 {
+	struct path *path = &file->f_path;
 	struct dentry *dentry = file_dentry(file);
 	struct inode *inode = file_inode(file);
 	int kill;
@@ -1857,7 +1858,7 @@ int file_remove_privs(struct file *file)
 	if (kill < 0)
 		return kill;
 	if (kill)
-		error = __remove_privs(dentry, kill);
+		error = __remove_privs(path, kill);
 	if (!error)
 		inode_has_no_xattr(inode);
 
diff --git a/fs/namei.c b/fs/namei.c
index db6565c99825..531ac55c7e67 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3080,7 +3080,7 @@ static int handle_truncate(struct file *filp)
 	if (!error)
 		error = security_path_truncate(path);
 	if (!error) {
-		error = do_truncate(path->dentry, 0,
+		error = do_truncate(path, 0,
 				    ATTR_MTIME|ATTR_CTIME|ATTR_OPEN,
 				    filp);
 	}
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 0aa02eb18bd3..a51a69e0cc87 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -366,8 +366,8 @@ __be32
 nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
 	     int check_guard, time64_t guardtime)
 {
-	struct dentry	*dentry;
 	struct inode	*inode;
+	struct path	path;
 	int		accmode = NFSD_MAY_SATTR;
 	umode_t		ftype = 0;
 	__be32		err;
@@ -406,8 +406,11 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
 			goto out;
 	}
 
-	dentry = fhp->fh_dentry;
-	inode = d_inode(dentry);
+	path = (struct path) {
+		.mnt = fhp->fh_export->ex_path.mnt,
+		.dentry = fhp->fh_dentry,
+	};
+	inode = d_inode(path.dentry);
 
 	/* Ignore any mode updates on symlinks */
 	if (S_ISLNK(inode->i_mode))
@@ -448,7 +451,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
 			.ia_size	= iap->ia_size,
 		};
 
-		host_err = notify_change(dentry, &size_attr, NULL);
+		host_err = notify_change(&path, &size_attr, NULL);
 		if (host_err)
 			goto out_unlock;
 		iap->ia_valid &= ~ATTR_SIZE;
@@ -463,7 +466,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
 	}
 
 	iap->ia_valid |= ATTR_CTIME;
-	host_err = notify_change(dentry, iap, NULL);
+	host_err = notify_change(&path, iap, NULL);
 
 out_unlock:
 	fh_unlock(fhp);
diff --git a/fs/open.c b/fs/open.c
index 0788b3715731..db6758b9636a 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -35,11 +35,12 @@
 
 #include "internal.h"
 
-int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
+int do_truncate(const struct path *path, loff_t length, unsigned int time_attrs,
 	struct file *filp)
 {
 	int ret;
 	struct iattr newattrs;
+	struct dentry *dentry = path->dentry;
 
 	/* Not pretty: "inode->i_size" shouldn't really be signed. But it is. */
 	if (length < 0)
@@ -61,7 +62,7 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
 
 	inode_lock(dentry->d_inode);
 	/* Note any delegations or leases have already been broken: */
-	ret = notify_change(dentry, &newattrs, NULL);
+	ret = notify_change(path, &newattrs, NULL);
 	inode_unlock(dentry->d_inode);
 	return ret;
 }
@@ -107,7 +108,7 @@ long vfs_truncate(const struct path *path, loff_t length)
 	if (!error)
 		error = security_path_truncate(path);
 	if (!error)
-		error = do_truncate(path->dentry, length, 0, NULL);
+		error = do_truncate(path, length, 0, NULL);
 
 put_write_and_out:
 	put_write_access(inode);
@@ -155,7 +156,7 @@ COMPAT_SYSCALL_DEFINE2(truncate, const char __user *, path, compat_off_t, length
 long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
 {
 	struct inode *inode;
-	struct dentry *dentry;
+	struct path *path;
 	struct fd f;
 	int error;
 
@@ -171,8 +172,8 @@ long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
 	if (f.file->f_flags & O_LARGEFILE)
 		small = 0;
 
-	dentry = f.file->f_path.dentry;
-	inode = dentry->d_inode;
+	path = &f.file->f_path;
+	inode = path->dentry->d_inode;
 	error = -EINVAL;
 	if (!S_ISREG(inode->i_mode) || !(f.file->f_mode & FMODE_WRITE))
 		goto out_putf;
@@ -192,7 +193,7 @@ long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
 	if (!error)
 		error = security_path_truncate(&f.file->f_path);
 	if (!error)
-		error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, f.file);
+		error = do_truncate(path, length, ATTR_MTIME|ATTR_CTIME, f.file);
 	sb_end_write(inode->i_sb);
 out_putf:
 	fdput(f);
@@ -558,7 +559,7 @@ static int chmod_common(const struct path *path, umode_t mode)
 		goto out_unlock;
 	newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
 	newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
-	error = notify_change(path->dentry, &newattrs, &delegated_inode);
+	error = notify_change(path, &newattrs, &delegated_inode);
 out_unlock:
 	inode_unlock(inode);
 	if (delegated_inode) {
@@ -649,7 +650,7 @@ static int chown_common(const struct path *path, uid_t user, gid_t group)
 	inode_lock(inode);
 	error = security_path_chown(path, uid, gid);
 	if (!error)
-		error = notify_change(path->dentry, &newattrs, &delegated_inode);
+		error = notify_change(path, &newattrs, &delegated_inode);
 	inode_unlock(inode);
 	if (delegated_inode) {
 		error = break_deleg_wait(&delegated_inode);
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 9fc47c2e078d..05cfbd579690 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -214,17 +214,17 @@ static int ovl_copy_up_data(struct path *old, struct path *new, loff_t len)
 	return error;
 }
 
-static int ovl_set_size(struct dentry *upperdentry, struct kstat *stat)
+static int ovl_set_size(struct path *upperpath, struct kstat *stat)
 {
 	struct iattr attr = {
 		.ia_valid = ATTR_SIZE,
 		.ia_size = stat->size,
 	};
 
-	return notify_change(upperdentry, &attr, NULL);
+	return notify_change(upperpath, &attr, NULL);
 }
 
-static int ovl_set_timestamps(struct dentry *upperdentry, struct kstat *stat)
+static int ovl_set_timestamps(struct path *upperpath, struct kstat *stat)
 {
 	struct iattr attr = {
 		.ia_valid =
@@ -233,10 +233,10 @@ static int ovl_set_timestamps(struct dentry *upperdentry, struct kstat *stat)
 		.ia_mtime = stat->mtime,
 	};
 
-	return notify_change(upperdentry, &attr, NULL);
+	return notify_change(upperpath, &attr, NULL);
 }
 
-int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
+int ovl_set_attr(struct path *upperpath, struct kstat *stat)
 {
 	int err = 0;
 
@@ -245,7 +245,7 @@ int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
 			.ia_valid = ATTR_MODE,
 			.ia_mode = stat->mode,
 		};
-		err = notify_change(upperdentry, &attr, NULL);
+		err = notify_change(upperpath, &attr, NULL);
 	}
 	if (!err) {
 		struct iattr attr = {
@@ -253,10 +253,10 @@ int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
 			.ia_uid = stat->uid,
 			.ia_gid = stat->gid,
 		};
-		err = notify_change(upperdentry, &attr, NULL);
+		err = notify_change(upperpath, &attr, NULL);
 	}
 	if (!err)
-		ovl_set_timestamps(upperdentry, stat);
+		ovl_set_timestamps(upperpath, stat);
 
 	return err;
 }
@@ -435,8 +435,13 @@ static int ovl_link_up(struct ovl_copy_up_ctx *c)
 {
 	int err;
 	struct dentry *upper;
-	struct dentry *upperdir = ovl_dentry_upper(c->parent);
-	struct inode *udir = d_inode(upperdir);
+	struct dentry *upperdir;
+	struct path upperdirpath;
+	struct inode *udir;
+
+	ovl_path_upper(c->parent, &upperdirpath);
+	upperdir = upperdirpath.dentry;
+	udir = d_inode(upperdir);
 
 	/* Mark parent "impure" because it may now contain non-pure upper */
 	err = ovl_set_impure(c->parent, upperdir);
@@ -457,7 +462,7 @@ static int ovl_link_up(struct ovl_copy_up_ctx *c)
 
 		if (!err) {
 			/* Restore timestamps on parent (best effort) */
-			ovl_set_timestamps(upperdir, &c->pstat);
+			ovl_set_timestamps(&upperdirpath, &c->pstat);
 			ovl_dentry_set_upper_alias(c->dentry);
 		}
 	}
@@ -473,15 +478,16 @@ static int ovl_link_up(struct ovl_copy_up_ctx *c)
 static int ovl_copy_up_inode(struct ovl_copy_up_ctx *c, struct dentry *temp)
 {
 	int err;
+	struct path upperpath, temppath;
 
+	ovl_path_upper(c->dentry, &upperpath);
 	/*
 	 * Copy up data first and then xattrs. Writing data after
 	 * xattrs will remove security.capability xattr automatically.
 	 */
 	if (S_ISREG(c->stat.mode) && !c->metacopy) {
-		struct path upperpath, datapath;
+		struct path datapath;
 
-		ovl_path_upper(c->dentry, &upperpath);
 		if (WARN_ON(upperpath.dentry != NULL))
 			return -EIO;
 		upperpath.dentry = temp;
@@ -515,12 +521,13 @@ static int ovl_copy_up_inode(struct ovl_copy_up_ctx *c, struct dentry *temp)
 		if (err)
 			return err;
 	}
+	temppath = (struct path){ .mnt = upperpath.mnt, .dentry = temp };
 
 	inode_lock(temp->d_inode);
 	if (S_ISREG(c->stat.mode))
-		err = ovl_set_size(temp, &c->stat);
+		err = ovl_set_size(&temppath, &c->stat);
 	if (!err)
-		err = ovl_set_attr(temp, &c->stat);
+		err = ovl_set_attr(&temppath, &c->stat);
 	inode_unlock(temp->d_inode);
 
 	return err;
@@ -736,10 +743,11 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
 		err = ovl_set_nlink_upper(c->dentry);
 	} else {
 		struct inode *udir = d_inode(c->destdir);
+		struct path destpath = { .mnt = ofs->upper_mnt, .dentry = c->destdir };
 
 		/* Restore timestamps on parent (best effort) */
 		inode_lock(udir);
-		ovl_set_timestamps(c->destdir, &c->pstat);
+		ovl_set_timestamps(&destpath, &c->pstat);
 		inode_unlock(udir);
 
 		ovl_dentry_set_upper_alias(c->dentry);
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 8e57d5372b8f..cecd7e244829 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -374,7 +374,8 @@ static struct dentry *ovl_clear_empty(struct dentry *dentry,
 		goto out_cleanup;
 
 	inode_lock(opaquedir->d_inode);
-	err = ovl_set_attr(opaquedir, &stat);
+	err = ovl_set_attr(&(struct path) { .mnt = upperpath.mnt,
+					    .dentry = opaquedir }, &stat);
 	inode_unlock(opaquedir->d_inode);
 	if (err)
 		goto out_cleanup;
@@ -435,10 +436,13 @@ static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
 	struct inode *udir = upperdir->d_inode;
 	struct dentry *upper;
 	struct dentry *newdentry;
+	struct path newpath;
 	int err;
 	struct posix_acl *acl, *default_acl;
 	bool hardlink = !!cattr->hardlink;
 
+	ovl_path_upper(dentry, &newpath);
+
 	if (WARN_ON(!workdir))
 		return -EROFS;
 
@@ -478,8 +482,10 @@ static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
 			.ia_valid = ATTR_MODE,
 			.ia_mode = cattr->mode,
 		};
+
+		newpath.dentry = newdentry;
 		inode_lock(newdentry->d_inode);
-		err = notify_change(newdentry, &attr, NULL);
+		err = notify_change(&newpath, &attr, NULL);
 		inode_unlock(newdentry->d_inode);
 		if (err)
 			goto out_cleanup;
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 79e8994e3bc1..f3d86b357a23 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -45,8 +45,10 @@ int ovl_setattr(struct dentry *dentry, struct iattr *attr)
 		err = ovl_copy_up_with_data(dentry);
 	if (!err) {
 		struct inode *winode = NULL;
+		struct path upperpath;
 
-		upperdentry = ovl_dentry_upper(dentry);
+		ovl_path_upper(dentry, &upperpath);
+		upperdentry = upperpath.dentry;
 
 		if (attr->ia_valid & ATTR_SIZE) {
 			winode = d_inode(upperdentry);
@@ -60,7 +62,7 @@ int ovl_setattr(struct dentry *dentry, struct iattr *attr)
 
 		inode_lock(upperdentry->d_inode);
 		old_cred = ovl_override_creds(dentry->d_sb);
-		err = notify_change(upperdentry, attr, NULL);
+		err = notify_change(&upperpath, attr, NULL);
 		revert_creds(old_cred);
 		if (!err)
 			ovl_copyattr(upperdentry->d_inode, dentry->d_inode);
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 3623d28aa4fa..ecd20f3d979b 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -459,7 +459,7 @@ int ovl_copy_up_with_data(struct dentry *dentry);
 int ovl_copy_up_flags(struct dentry *dentry, int flags);
 int ovl_maybe_copy_up(struct dentry *dentry, int flags);
 int ovl_copy_xattr(struct dentry *old, struct dentry *new);
-int ovl_set_attr(struct dentry *upper, struct kstat *stat);
+int ovl_set_attr(struct path *upperpath, struct kstat *stat);
 struct ovl_fh *ovl_encode_real_fh(struct dentry *real, bool is_upper);
 int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
 		   struct dentry *upper);
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 319fe0d355b0..1cd87964b34f 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -633,6 +633,7 @@ static struct dentry *ovl_workdir_create(struct ovl_fs *ofs,
 			.ia_valid = ATTR_MODE,
 			.ia_mode = S_IFDIR | 0,
 		};
+		const struct path workpath = { .mnt = mnt, .dentry = work };
 
 		if (work->d_inode) {
 			err = -EEXIST;
@@ -676,7 +677,7 @@ static struct dentry *ovl_workdir_create(struct ovl_fs *ofs,
 
 		/* Clear any inherited mode bits */
 		inode_lock(work->d_inode);
-		err = notify_change(work, &attr, NULL);
+		err = notify_change(&workpath, &attr, NULL);
 		inode_unlock(work->d_inode);
 		if (err)
 			goto out_dput;
diff --git a/fs/utimes.c b/fs/utimes.c
index 1d17ce98cb80..8b5635d30de4 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -57,7 +57,7 @@ static int utimes_common(const struct path *path, struct timespec64 *times)
 	}
 retry_deleg:
 	inode_lock(inode);
-	error = notify_change(path->dentry, &newattrs, &delegated_inode);
+	error = notify_change(path, &newattrs, &delegated_inode);
 	inode_unlock(inode);
 	if (delegated_inode) {
 		error = break_deleg_wait(&delegated_inode);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 4dc62a697817..d0e7ca7bf72e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2537,8 +2537,8 @@ struct filename {
 static_assert(offsetof(struct filename, iname) % sizeof(long) == 0);
 
 extern long vfs_truncate(const struct path *, loff_t);
-extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
-		       struct file *filp);
+extern int do_truncate(const struct path *p, loff_t start,
+		       unsigned int time_attrs, struct file *filp);
 extern int vfs_fallocate(struct file *file, int mode, loff_t offset,
 			loff_t len);
 extern long do_sys_open(int dfd, const char __user *filename, int flags,
@@ -2887,8 +2887,7 @@ static inline int bmap(struct inode *inode,  sector_t *block)
 	return -EINVAL;
 }
 #endif
-
-extern int notify_change(struct dentry *, struct iattr *, struct inode **);
+extern int notify_change(const struct path *, struct iattr *, struct inode **);
 extern int inode_permission(struct inode *, int);
 extern int generic_permission(struct inode *, int);
 extern int __check_sticky(struct inode *dir, struct inode *inode);
-- 
2.16.4

