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vfs: make vfs_create break delegations on parent directory

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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 <jack@suse.cz>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20251111-dir-deleg-ro-v6-10-52f3feebb2f2@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Jeff Layton
2025-11-11 09:12:51 -05:00
committed by Christian Brauner
parent 85bbffcad7
commit c826229c6a
8 changed files with 21 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
fs/ecryptfs/inode.c
View File

@@ -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);

15
fs/namei.c
View File

@@ -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;

2
fs/nfsd/nfs3proc.c
View File

@@ -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;

2
fs/nfsd/vfs.c
View File

@@ -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;

2
fs/open.c
View File

@@ -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);

2
fs/overlayfs/overlayfs.h
View File

@@ -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;

2
fs/smb/server/vfs.c
View File

@@ -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));

3
include/linux/fs.h
View File

@@ -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 *,