From: Jeff Layton Date: Tue, 11 Nov 2025 14:12:51 +0000 (-0500) Subject: vfs: make vfs_create break delegations on parent directory X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c826229c6a82fe1fe7b7752692f87a881eb4b545;p=thirdparty%2Flinux.git vfs: make vfs_create break delegations on parent directory 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 parameter to vfs_create. Most callers are converted to pass in NULL, but do_mknodat() is changed to wait for a delegation break if there is one. Reviewed-by: Jan Kara Reviewed-by: NeilBrown Signed-off-by: Jeff Layton Link: https://patch.msgid.link/20251111-dir-deleg-ro-v6-10-52f3feebb2f2@kernel.org Signed-off-by: Christian Brauner --- diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index d109e3763a88..3341f00dd087 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -188,7 +188,7 @@ ecryptfs_do_create(struct inode *directory_inode, rc = lock_parent(ecryptfs_dentry, &lower_dentry, &lower_dir); if (!rc) - rc = vfs_create(&nop_mnt_idmap, lower_dentry, mode); + rc = vfs_create(&nop_mnt_idmap, lower_dentry, mode, NULL); if (rc) { printk(KERN_ERR "%s: Failure to create dentry in lower fs; " "rc = [%d]\n", __func__, rc); diff --git a/fs/namei.c b/fs/namei.c index 9586c6aba6ea..b20f053374a5 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -3463,6 +3463,7 @@ static inline umode_t vfs_prepare_mode(struct mnt_idmap *idmap, * @idmap: idmap of the mount the inode was found from * @dentry: dentry of the child file * @mode: mode of the child file + * @di: returns parent inode, if the inode is delegated. * * Create a new file. * @@ -3472,7 +3473,8 @@ static inline umode_t vfs_prepare_mode(struct mnt_idmap *idmap, * On non-idmapped mounts or if permission checking is to be performed on the * raw inode simply pass @nop_mnt_idmap. */ -int vfs_create(struct mnt_idmap *idmap, struct dentry *dentry, umode_t mode) +int vfs_create(struct mnt_idmap *idmap, struct dentry *dentry, umode_t mode, + struct delegated_inode *di) { struct inode *dir = d_inode(dentry->d_parent); int error; @@ -3486,6 +3488,9 @@ int vfs_create(struct mnt_idmap *idmap, struct dentry *dentry, umode_t mode) mode = vfs_prepare_mode(idmap, dir, mode, S_IALLUGO, S_IFREG); error = security_inode_create(dir, dentry, mode); + if (error) + return error; + error = try_break_deleg(dir, di); if (error) return error; error = dir->i_op->create(idmap, dir, dentry, mode, true); @@ -4358,6 +4363,7 @@ static int may_mknod(umode_t mode) static int do_mknodat(int dfd, struct filename *name, umode_t mode, unsigned int dev) { + struct delegated_inode di = { }; struct mnt_idmap *idmap; struct dentry *dentry; struct path path; @@ -4381,7 +4387,7 @@ retry: idmap = mnt_idmap(path.mnt); switch (mode & S_IFMT) { case 0: case S_IFREG: - error = vfs_create(idmap, dentry, mode); + error = vfs_create(idmap, dentry, mode, &di); if (!error) security_path_post_mknod(idmap, dentry); break; @@ -4396,6 +4402,11 @@ retry: } out2: end_creating_path(&path, dentry); + if (is_delegated(&di)) { + error = break_deleg_wait(&di); + if (!error) + goto retry; + } if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c index 30ea7ffa2aff..2cb972b5ed99 100644 --- a/fs/nfsd/nfs3proc.c +++ b/fs/nfsd/nfs3proc.c @@ -344,7 +344,7 @@ nfsd3_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp, status = fh_fill_pre_attrs(fhp); if (status != nfs_ok) goto out; - host_err = vfs_create(&nop_mnt_idmap, child, iap->ia_mode); + host_err = vfs_create(&nop_mnt_idmap, child, iap->ia_mode, NULL); if (host_err < 0) { status = nfserrno(host_err); goto out; diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 464fd54675f3..de5f46f8c6d3 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1552,7 +1552,7 @@ nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp, err = 0; switch (type) { case S_IFREG: - host_err = vfs_create(&nop_mnt_idmap, dchild, iap->ia_mode); + host_err = vfs_create(&nop_mnt_idmap, dchild, iap->ia_mode, NULL); if (!host_err) nfsd_check_ignore_resizing(iap); break; diff --git a/fs/open.c b/fs/open.c index e440f58e3ce8..92cf2e11781b 100644 --- a/fs/open.c +++ b/fs/open.c @@ -1171,7 +1171,7 @@ struct file *dentry_create(const struct path *path, int flags, umode_t mode, if (IS_ERR(f)) return f; - error = vfs_create(mnt_idmap(path->mnt), path->dentry, mode); + error = vfs_create(mnt_idmap(path->mnt), path->dentry, mode, NULL); if (!error) error = vfs_open(path, f); diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h index 2bdc434941eb..e30441cc9c63 100644 --- a/fs/overlayfs/overlayfs.h +++ b/fs/overlayfs/overlayfs.h @@ -235,7 +235,7 @@ static inline int ovl_do_create(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry, umode_t mode) { - int err = vfs_create(ovl_upper_mnt_idmap(ofs), dentry, mode); + int err = vfs_create(ovl_upper_mnt_idmap(ofs), dentry, mode, NULL); pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); return err; diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c index 83ece2de4b23..3747851b61c8 100644 --- a/fs/smb/server/vfs.c +++ b/fs/smb/server/vfs.c @@ -188,7 +188,7 @@ int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode) } mode |= S_IFREG; - err = vfs_create(mnt_idmap(path.mnt), dentry, mode); + err = vfs_create(mnt_idmap(path.mnt), dentry, mode, NULL); if (!err) { ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(dentry)); diff --git a/include/linux/fs.h b/include/linux/fs.h index 21876ef1fec9..83b05aec4e10 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2111,7 +2111,8 @@ bool inode_owner_or_capable(struct mnt_idmap *idmap, /* * VFS helper functions.. */ -int vfs_create(struct mnt_idmap *, struct dentry *, umode_t); +int vfs_create(struct mnt_idmap *, struct dentry *, umode_t, + struct delegated_inode *); struct dentry *vfs_mkdir(struct mnt_idmap *, struct inode *, struct dentry *, umode_t, struct delegated_inode *); int vfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *,