[PATCH v6 07/17] vfs: allow rmdir to wait for delegation break on parent

Jeff Layton
2025-11-11T14:13:27Z

In order to add directory delegation support, we need to break
delegations on the parent whenever there is going to be a change in the
directory.

Add a delegated_inode struct to vfs_rmdir() and populate that
pointer with the parent inode if it's non-NULL. Most existing in-kernel
callers pass in a NULL pointer.

Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
drivers/base/devtmpfs.c | 2 +-
fs/ecryptfs/inode.c | 2 +-
fs/namei.c | 22 +++++++++++++++++-----
fs/nfsd/nfs4recover.c | 4 ++--
fs/nfsd/vfs.c | 2 +-
fs/overlayfs/overlayfs.h | 2 +-
fs/smb/server/vfs.c | 4 ++--
include/linux/fs.h | 3 ++-
8 files changed, 27 insertions(+), 14 deletions(-)

diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index 0e79621cb0f79870003b867ca384199171ded4e0..104025104ef75381984fd94dfbd50feeaa8cdd22 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -261,7 +261,7 @@ static int dev_rmdir(const char *name)
return PTR_ERR(dentry);
if (d_inode(dentry)->i_private == &thread)
err = vfs_rmdir(&nop_mnt_idmap, d_inode(parent.dentry),
- dentry);
+ dentry, NULL);
else
err = -EPERM;

diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 35830b3144f8f71374a78b3e7463b864f4fc216e..88631291b32535f623a3fbe4ea9b6ed48a306ca0 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -540,7 +540,7 @@ static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
if (d_unhashed(lower_dentry))
rc = -EINVAL;
else
- rc = vfs_rmdir(&nop_mnt_idmap, lower_dir, lower_dentry);
+ rc = vfs_rmdir(&nop_mnt_idmap, lower_dir, lower_dentry, NULL);
}
if (!rc) {
clear_nlink(d_inode(dentry));
diff --git a/fs/namei.c b/fs/namei.c
index 76c0587d991ff7307e3dde69497719d716c8d7b8..9e0393a92091ac522b5324fcdad8c5592a948e8d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4522,9 +4522,10 @@ SYSCALL_DEFINE2(mkdir, const char __user *, pathname, umode_t, mode)

/**
* vfs_rmdir - remove directory
- * @idmap: idmap of the mount the inode was found from
- * @dir: inode of the parent directory
- * @dentry: dentry of the child directory
+ * @idmap: idmap of the mount the inode was found from
+ * @dir: inode of the parent directory
+ * @dentry: dentry of the child directory
+ * @delegated_inode: returns parent inode, if it's delegated.
*
* Remove a directory.
*
@@ -4535,7 +4536,7 @@ SYSCALL_DEFINE2(mkdir, const char __user *, pathname, umode_t, mode)
* raw inode simply pass @nop_mnt_idmap.
*/
int vfs_rmdir(struct mnt_idmap *idmap, struct inode *dir,
- struct dentry *dentry)
+ struct dentry *dentry, struct delegated_inode *delegated_inode)
{
int error = may_delete(idmap, dir, dentry, 1);

@@ -4557,6 +4558,10 @@ int vfs_rmdir(struct mnt_idmap *idmap, struct inode *dir,
if (error)
goto out;

+ error = try_break_deleg(dir, delegated_inode);
+ if (error)
+ goto out;
+
error = dir->i_op->rmdir(dir, dentry);
if (error)
goto out;
@@ -4583,6 +4588,7 @@ int do_rmdir(int dfd, struct filename *name)
struct qstr last;
int type;
unsigned int lookup_flags = 0;
+ struct delegated_inode delegated_inode = { };
retry:
error = filename_parentat(dfd, name, lookup_flags, &path, &last, &type);
if (error)
@@ -4612,7 +4618,8 @@ int do_rmdir(int dfd, struct filename *name)
error = security_path_rmdir(&path, dentry);
if (error)
goto exit4;
- error = vfs_rmdir(mnt_idmap(path.mnt), path.dentry->d_inode, dentry);
+ error = vfs_rmdir(mnt_idmap(path.mnt), path.dentry->d_inode,
+ dentry, &delegated_inode);
exit4:
dput(dentry);
exit3:
@@ -4620,6 +4627,11 @@ int do_rmdir(int dfd, struct filename *name)
mnt_drop_write(path.mnt);
exit2:
path_put(&path);
+ if (is_delegated(&delegated_inode)) {
+ error = break_deleg_wait(&delegated_inode);
+ if (!error)
+ goto retry;
+ }
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 1f56834b2072fcee1d0d400bbb554b0c949ecab4..30bae93931d9c9f8900dfcf96f79403db4f3f458 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -337,7 +337,7 @@ nfsd4_unlink_clid_dir(char *name, struct nfsd_net *nn)
status = -ENOENT;
if (d_really_is_negative(dentry))
goto out;
- status = vfs_rmdir(&nop_mnt_idmap, d_inode(dir), dentry);
+ status = vfs_rmdir(&nop_mnt_idmap, d_inode(dir), dentry, NULL);
out:
dput(dentry);
out_unlock:
@@ -427,7 +427,7 @@ purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
if (nfs4_has_reclaimed_state(name, nn))
goto out_free;

- status = vfs_rmdir(&nop_mnt_idmap, d_inode(parent), child);
+ status = vfs_rmdir(&nop_mnt_idmap, d_inode(parent), child, NULL);
if (status)
printk("failed to remove client recovery directory %pd\n",
child);
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 97aef140cbf5fca4c41738fdcaccba3b57886463..c400ea94ff2e837fd59719bf2c4b79ef1d064743 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -2108,7 +2108,7 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
break;
}
} else {
- host_err = vfs_rmdir(&nop_mnt_idmap, dirp, rdentry);
+ host_err = vfs_rmdir(&nop_mnt_idmap, dirp, rdentry, NULL);
}
fh_fill_post_attrs(fhp);

diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 0f65f9a5d54d4786b39e4f4f30f416d5b9016e70..d215d7349489686b66bb66e939b27046f7d836f6 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -206,7 +206,7 @@ static inline int ovl_do_notify_change(struct ovl_fs *ofs,
static inline int ovl_do_rmdir(struct ovl_fs *ofs,
struct inode *dir, struct dentry *dentry)
{
- int err = vfs_rmdir(ovl_upper_mnt_idmap(ofs), dir, dentry);
+ int err = vfs_rmdir(ovl_upper_mnt_idmap(ofs), dir, dentry, NULL);

pr_debug("rmdir(%pd2) = %i\n", dentry, err);
return err;
diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c
index 3d2190f26623b23ea79c63410905a3c3ad684048..c5f0f3170d586cb2dc4d416b80948c642797fb82 100644
--- a/fs/smb/server/vfs.c
+++ b/fs/smb/server/vfs.c
@@ -609,7 +609,7 @@ int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)

idmap = mnt_idmap(path->mnt);
if (S_ISDIR(d_inode(path->dentry)->i_mode)) {
- err = vfs_rmdir(idmap, d_inode(parent), path->dentry);
+ err = vfs_rmdir(idmap, d_inode(parent), path->dentry, NULL);
if (err && err != -ENOTEMPTY)
ksmbd_debug(VFS, "rmdir failed, err %d\n", err);
} else {
@@ -1090,7 +1090,7 @@ int ksmbd_vfs_unlink(struct file *filp)
dget(dentry);

if (S_ISDIR(d_inode(dentry)->i_mode))
- err = vfs_rmdir(idmap, d_inode(dir), dentry);
+ err = vfs_rmdir(idmap, d_inode(dir), dentry, NULL);
else
err = vfs_unlink(idmap, d_inode(dir), dentry, NULL);

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 20bb4c8a4e8e1be7e11047d228c05920ea6c388d..12873214e1c7811735ea5d2dee3d57e2a5604d8f 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2121,7 +2121,8 @@ int vfs_symlink(struct mnt_idmap *, struct inode *,
struct dentry *, const char *);
int vfs_link(struct dentry *, struct mnt_idmap *, struct inode *,
struct dentry *, struct delegated_inode *);
-int vfs_rmdir(struct mnt_idmap *, struct inode *, struct dentry *);
+int vfs_rmdir(struct mnt_idmap *, struct inode *, struct dentry *,
+ struct delegated_inode *);
int vfs_unlink(struct mnt_idmap *, struct inode *, struct dentry *,
struct delegated_inode *);

--
2.51.1