[PATCH v5 20/42] namei: introduce struct renamedata
From: Christian Brauner <hidden>
Date: 2021-01-12 22:06:51
Also in:
linux-ext4, linux-fsdevel, linux-integrity, linux-security-module, linux-xfs, selinux
Subsystem:
cachefiles: fs-cache backend for caching on mounted filesystems, ecrypt file system, filesystems (vfs and infrastructure), kernel nfsd, sunrpc, and lockd servers, overlay filesystem, the rest · Maintainers:
David Howells, Tyler Hicks, Alexander Viro, Christian Brauner, Chuck Lever, Jeff Layton, Miklos Szeredi, Amir Goldstein, Linus Torvalds
In order to handle idmapped mounts we will extend the vfs rename helper
to take two new arguments in follow up patches. Since this operations
already takes a bunch of arguments add a simple struct renamedata (based
on struct nameidata) and make the current helper use it before we extend
it.
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <redacted>
---
/* v2 */
unchanged
/* v3 */
unchanged
/* v4 */
- Serge Hallyn [off-list ref]:
- Use "mnt_userns" to refer to a vfsmount's userns everywhere to make
terminology consistent.
- Christoph Hellwig [off-list ref]:
- Declare variable on separate lines instead of chaining them and
wrapping with weird indentation.
/* v5 */
base-commit: 7c53f6b671f4aba70ff15e1b05148b10d58c2837
---
fs/cachefiles/namei.c | 9 +++++++--
fs/ecryptfs/inode.c | 10 +++++++---
fs/namei.c | 21 +++++++++++++++------
fs/nfsd/vfs.c | 8 +++++++-
fs/overlayfs/overlayfs.h | 9 ++++++++-
include/linux/fs.h | 12 +++++++++++-
6 files changed, 55 insertions(+), 14 deletions(-)
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index ecc8ecbbfa5a..7b987de0babe 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c@@ -412,9 +412,14 @@ static int cachefiles_bury_object(struct cachefiles_cache *cache, if (ret < 0) { cachefiles_io_error(cache, "Rename security error %d", ret); } else { + struct renamedata rd = { + .old_dir = d_inode(dir), + .old_dentry = rep, + .new_dir = d_inode(cache->graveyard), + .new_dentry = grave, + }; trace_cachefiles_rename(object, rep, grave, why); - ret = vfs_rename(d_inode(dir), rep, - d_inode(cache->graveyard), grave, NULL, 0); + ret = vfs_rename(&rd); if (ret != 0 && ret != -ENOMEM) cachefiles_io_error(cache, "Rename failed with error %d", ret);
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 0a218d7c3023..0697480ee2eb 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c@@ -590,6 +590,7 @@ ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, struct dentry *lower_new_dir_dentry; struct dentry *trap; struct inode *target_inode; + struct renamedata rd = {}; if (flags) return -EINVAL;
@@ -619,9 +620,12 @@ ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, rc = -ENOTEMPTY; goto out_lock; } - rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, - d_inode(lower_new_dir_dentry), lower_new_dentry, - NULL, 0); + + rd.old_dir = d_inode(lower_old_dir_dentry); + rd.old_dentry = lower_old_dentry; + rd.new_dir = d_inode(lower_new_dir_dentry); + rd.new_dentry = lower_new_dentry; + rc = vfs_rename(&rd); if (rc) goto out_lock; if (target_inode)
diff --git a/fs/namei.c b/fs/namei.c
index 05f1db8e7ed0..d145dceeaeb0 100644
--- a/fs/namei.c
+++ b/fs/namei.c@@ -4315,12 +4315,15 @@ SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname * ->i_mutex on parents, which works but leads to some truly excessive * locking]. */ -int vfs_rename(struct inode *old_dir, struct dentry *old_dentry, - struct inode *new_dir, struct dentry *new_dentry, - struct inode **delegated_inode, unsigned int flags) +int vfs_rename(struct renamedata *rd) { int error; struct user_namespace *mnt_userns = &init_user_ns; + struct inode *old_dir = rd->old_dir, *new_dir = rd->new_dir; + struct dentry *old_dentry = rd->old_dentry; + struct dentry *new_dentry = rd->new_dentry; + struct inode **delegated_inode = rd->delegated_inode; + unsigned int flags = rd->flags; bool is_dir = d_is_dir(old_dentry); struct inode *source = old_dentry->d_inode; struct inode *target = new_dentry->d_inode;
@@ -4444,6 +4447,7 @@ EXPORT_SYMBOL(vfs_rename); int do_renameat2(int olddfd, struct filename *from, int newdfd, struct filename *to, unsigned int flags) { + struct renamedata rd; struct dentry *old_dentry, *new_dentry; struct dentry *trap; struct path old_path, new_path;
@@ -4547,9 +4551,14 @@ int do_renameat2(int olddfd, struct filename *from, int newdfd, &new_path, new_dentry, flags); if (error) goto exit5; - error = vfs_rename(old_path.dentry->d_inode, old_dentry, - new_path.dentry->d_inode, new_dentry, - &delegated_inode, flags); + + rd.old_dir = old_path.dentry->d_inode; + rd.old_dentry = old_dentry; + rd.new_dir = new_path.dentry->d_inode; + rd.new_dentry = new_dentry; + rd.delegated_inode = &delegated_inode; + rd.flags = flags; + error = vfs_rename(&rd); exit5: dput(new_dentry); exit4:
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 494362c2e4fc..045f49a4352d 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c@@ -1797,7 +1797,13 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, close_cached = true; goto out_dput_old; } else { - host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL, 0); + struct renamedata rd = { + .old_dir = fdir, + .old_dentry = odentry, + .new_dir = tdir, + .new_dentry = ndentry, + }; + host_err = vfs_rename(&rd); if (!host_err) { host_err = commit_metadata(tfhp); if (!host_err)
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 0002834f664a..426899681df7 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h@@ -214,9 +214,16 @@ static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, unsigned int flags) { int err; + struct renamedata rd = { + .old_dir = olddir, + .old_dentry = olddentry, + .new_dir = newdir, + .new_dentry = newdentry, + .flags = flags, + }; pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); - err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); + err = vfs_rename(&rd); if (err) { pr_debug("...rename(%pd2, %pd2, ...) = %i\n", olddentry, newdentry, err);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e7c802478730..e0e27e4dd817 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h@@ -1774,7 +1774,17 @@ extern int vfs_symlink(struct inode *, struct dentry *, const char *); extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **); extern int vfs_rmdir(struct inode *, struct dentry *); extern int vfs_unlink(struct inode *, struct dentry *, struct inode **); -extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int); + +struct renamedata { + struct inode *old_dir; + struct dentry *old_dentry; + struct inode *new_dir; + struct dentry *new_dentry; + struct inode **delegated_inode; + unsigned int flags; +} __randomize_layout; + +extern int vfs_rename(struct renamedata *); static inline int vfs_whiteout(struct inode *dir, struct dentry *dentry) {
--
2.30.0