[PATCH RFC 07/24] vfs: make vfs_create break delegations on parent directory
From: Jeff Layton <jlayton@kernel.org>
Date: 2024-03-15 16:53:29
Also in:
linux-cifs, linux-fsdevel, linux-nfs, linux-unionfs, lkml, netfs
Subsystem:
ecrypt file system, filesystems (vfs and infrastructure), kernel nfsd, sunrpc, and lockd servers, kernel smb3 server (ksmbd), overlay filesystem, the rest · Maintainers:
Tyler Hicks, Alexander Viro, Christian Brauner, Chuck Lever, Jeff Layton, Namjae Jeon, Steve French, Miklos Szeredi, Amir Goldstein, Linus Torvalds
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 new delegated_inode parameter to vfs_create. Most callers will set that to NULL, but do_mknodat can use that to synchronously wait for the delegation break to complete. Signed-off-by: Jeff Layton <jlayton@kernel.org> --- fs/ecryptfs/inode.c | 2 +- fs/namei.c | 15 +++++++++++++-- fs/nfsd/nfs3proc.c | 2 +- fs/nfsd/vfs.c | 2 +- fs/open.c | 2 +- fs/overlayfs/overlayfs.h | 2 +- fs/smb/server/vfs.c | 2 +- include/linux/fs.h | 2 +- 8 files changed, 20 insertions(+), 9 deletions(-)
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 3d0cddbf037c..a99b1e264c46 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c@@ -189,7 +189,7 @@ 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_dir, - lower_dentry, mode, true); + lower_dentry, mode, true, 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 88598a62ec64..01e04cf155eb 100644
--- a/fs/namei.c
+++ b/fs/namei.c@@ -3174,6 +3174,7 @@ static inline umode_t vfs_prepare_mode(struct mnt_idmap *idmap, * @dentry: pointer to dentry of the base directory * @mode: mode of the new file * @want_excl: whether the file must not yet exist + * @delegated_inode: return pointer for delegated_inode * * Create a new file. *
@@ -3184,7 +3185,8 @@ static inline umode_t vfs_prepare_mode(struct mnt_idmap *idmap, * raw inode simply pass @nop_mnt_idmap. */ int vfs_create(struct mnt_idmap *idmap, struct inode *dir, - struct dentry *dentry, umode_t mode, bool want_excl) + struct dentry *dentry, umode_t mode, bool want_excl, + struct inode **delegated_inode) { int error;
@@ -3197,6 +3199,9 @@ int vfs_create(struct mnt_idmap *idmap, struct inode *dir, 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, delegated_inode); if (error) return error; error = dir->i_op->create(idmap, dir, dentry, mode, want_excl);
@@ -4047,6 +4052,7 @@ static int do_mknodat(int dfd, struct filename *name, umode_t mode, struct path path; int error; unsigned int lookup_flags = 0; + struct inode *delegated_inode = NULL; error = may_mknod(mode); if (error)
@@ -4066,7 +4072,7 @@ static int do_mknodat(int dfd, struct filename *name, umode_t mode, switch (mode & S_IFMT) { case 0: case S_IFREG: error = vfs_create(idmap, path.dentry->d_inode, - dentry, mode, true); + dentry, mode, true, &delegated_inode); if (!error) ima_post_path_mknod(idmap, dentry); break;
@@ -4081,6 +4087,11 @@ static int do_mknodat(int dfd, struct filename *name, umode_t mode, } out2: done_path_create(&path, dentry); + if (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/nfs3proc.c b/fs/nfsd/nfs3proc.c
index dfcc957e460d..e920a6291f2d 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c@@ -313,7 +313,7 @@ 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, inode, child, iap->ia_mode, true); + host_err = vfs_create(&nop_mnt_idmap, inode, child, iap->ia_mode, true, NULL); if (host_err < 0) { status = nfserrno(host_err); goto out;
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 34cc2d1a4944..47b8ab1d4b17 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c@@ -1491,7 +1491,7 @@ nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp, switch (type) { case S_IFREG: host_err = vfs_create(&nop_mnt_idmap, dirp, dchild, - iap->ia_mode, true); + iap->ia_mode, true, NULL); if (!host_err) nfsd_check_ignore_resizing(iap); break;
diff --git a/fs/open.c b/fs/open.c
index 0a73afe04d34..0b50ea7e8aec 100644
--- a/fs/open.c
+++ b/fs/open.c@@ -1137,7 +1137,7 @@ struct file *dentry_create(const struct path *path, int flags, umode_t mode, error = vfs_create(mnt_idmap(path->mnt), d_inode(path->dentry->d_parent), - path->dentry, mode, true); + path->dentry, mode, true, NULL); if (!error) error = vfs_open(path, f);
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 5b1f56294c4d..be2518e6da95 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h@@ -232,7 +232,7 @@ 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), dir, dentry, mode, true); + int err = vfs_create(ovl_upper_mnt_idmap(ofs), dir, dentry, mode, true, 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 5b4e5876c2ac..b313eb5a1d28 100644
--- a/fs/smb/server/vfs.c
+++ b/fs/smb/server/vfs.c@@ -187,7 +187,7 @@ int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode) mode |= S_IFREG; err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry), - dentry, mode, true); + dentry, mode, true, 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 e72c825476de..8fb4101fea49 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h@@ -1837,7 +1837,7 @@ bool inode_owner_or_capable(struct mnt_idmap *idmap, * VFS helper functions.. */ int vfs_create(struct mnt_idmap *, struct inode *, - struct dentry *, umode_t, bool); + struct dentry *, umode_t, bool, struct inode **); int vfs_mkdir(struct mnt_idmap *, struct inode *, struct dentry *, umode_t, struct inode **); int vfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *,
--
2.44.0