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Message-ID: <20250721084412.370258-2-neil@brown.name>
Date: Mon, 21 Jul 2025 17:59:57 +1000
From: NeilBrown <neil@...wn.name>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
Jan Kara <jack@...e.cz>
Cc: linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/7] VFS: unify old_mnt_idmap and new_mnt_idmap in renamedata
A rename can only rename with a single mount. Callers of vfs_rename()
must and do ensure this is the case.
So there is no point in having two mnt_idmaps in renamedata as they are
always the same. Only of of them is passed to ->rename in any case.
This patch replaces both with a single "mnt_idmap" and changes all
callers.
Signed-off-by: NeilBrown <neil@...wn.name>
---
fs/cachefiles/namei.c | 3 +--
fs/ecryptfs/inode.c | 3 +--
fs/namei.c | 17 ++++++++---------
fs/nfsd/vfs.c | 3 +--
fs/overlayfs/overlayfs.h | 3 +--
fs/smb/server/vfs.c | 3 +--
include/linux/fs.h | 6 ++----
7 files changed, 15 insertions(+), 23 deletions(-)
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index 91dfd0231877..d1edb2ac3837 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -387,10 +387,9 @@ int cachefiles_bury_object(struct cachefiles_cache *cache,
cachefiles_io_error(cache, "Rename security error %d", ret);
} else {
struct renamedata rd = {
- .old_mnt_idmap = &nop_mnt_idmap,
+ .mnt_idmap = &nop_mnt_idmap,
.old_parent = dir,
.old_dentry = rep,
- .new_mnt_idmap = &nop_mnt_idmap,
.new_parent = cache->graveyard,
.new_dentry = grave,
};
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 72fbe1316ab8..abd954c6a14e 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -634,10 +634,9 @@ ecryptfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
goto out_lock;
}
- rd.old_mnt_idmap = &nop_mnt_idmap;
+ rd.mnt_idmap = &nop_mnt_idmap;
rd.old_parent = lower_old_dir_dentry;
rd.old_dentry = lower_old_dentry;
- rd.new_mnt_idmap = &nop_mnt_idmap;
rd.new_parent = lower_new_dir_dentry;
rd.new_dentry = lower_new_dentry;
rc = vfs_rename(&rd);
diff --git a/fs/namei.c b/fs/namei.c
index cd43ff89fbaa..1c80445693d4 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -5024,20 +5024,20 @@ int vfs_rename(struct renamedata *rd)
if (source == target)
return 0;
- error = may_delete(rd->old_mnt_idmap, old_dir, old_dentry, is_dir);
+ error = may_delete(rd->mnt_idmap, old_dir, old_dentry, is_dir);
if (error)
return error;
if (!target) {
- error = may_create(rd->new_mnt_idmap, new_dir, new_dentry);
+ error = may_create(rd->mnt_idmap, new_dir, new_dentry);
} else {
new_is_dir = d_is_dir(new_dentry);
if (!(flags & RENAME_EXCHANGE))
- error = may_delete(rd->new_mnt_idmap, new_dir,
+ error = may_delete(rd->mnt_idmap, new_dir,
new_dentry, is_dir);
else
- error = may_delete(rd->new_mnt_idmap, new_dir,
+ error = may_delete(rd->mnt_idmap, new_dir,
new_dentry, new_is_dir);
}
if (error)
@@ -5052,13 +5052,13 @@ int vfs_rename(struct renamedata *rd)
*/
if (new_dir != old_dir) {
if (is_dir) {
- error = inode_permission(rd->old_mnt_idmap, source,
+ error = inode_permission(rd->mnt_idmap, source,
MAY_WRITE);
if (error)
return error;
}
if ((flags & RENAME_EXCHANGE) && new_is_dir) {
- error = inode_permission(rd->new_mnt_idmap, target,
+ error = inode_permission(rd->mnt_idmap, target,
MAY_WRITE);
if (error)
return error;
@@ -5126,7 +5126,7 @@ int vfs_rename(struct renamedata *rd)
if (error)
goto out;
}
- error = old_dir->i_op->rename(rd->new_mnt_idmap, old_dir, old_dentry,
+ error = old_dir->i_op->rename(rd->mnt_idmap, old_dir, old_dentry,
new_dir, new_dentry, flags);
if (error)
goto out;
@@ -5269,10 +5269,9 @@ int do_renameat2(int olddfd, struct filename *from, int newdfd,
rd.old_parent = old_path.dentry;
rd.old_dentry = old_dentry;
- rd.old_mnt_idmap = mnt_idmap(old_path.mnt);
+ rd.mnt_idmap = mnt_idmap(old_path.mnt);
rd.new_parent = new_path.dentry;
rd.new_dentry = new_dentry;
- rd.new_mnt_idmap = mnt_idmap(new_path.mnt);
rd.delegated_inode = &delegated_inode;
rd.flags = flags;
error = vfs_rename(&rd);
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 7d522e426b2d..a21940cadede 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1940,10 +1940,9 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
goto out_dput_old;
} else {
struct renamedata rd = {
- .old_mnt_idmap = &nop_mnt_idmap,
+ .mnt_idmap = &nop_mnt_idmap,
.old_parent = fdentry,
.old_dentry = odentry,
- .new_mnt_idmap = &nop_mnt_idmap,
.new_parent = tdentry,
.new_dentry = ndentry,
};
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index bb0d7ded8e76..4f84abaa0d68 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -361,10 +361,9 @@ static inline int ovl_do_rename(struct ovl_fs *ofs, struct dentry *olddir,
{
int err;
struct renamedata rd = {
- .old_mnt_idmap = ovl_upper_mnt_idmap(ofs),
+ .mnt_idmap = ovl_upper_mnt_idmap(ofs),
.old_parent = olddir,
.old_dentry = olddentry,
- .new_mnt_idmap = ovl_upper_mnt_idmap(ofs),
.new_parent = newdir,
.new_dentry = newdentry,
.flags = flags,
diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c
index 49e731dd0529..bfd62a21e75c 100644
--- a/fs/smb/server/vfs.c
+++ b/fs/smb/server/vfs.c
@@ -770,10 +770,9 @@ int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
goto out4;
}
- rd.old_mnt_idmap = mnt_idmap(old_path->mnt),
+ rd.mnt_idmap = mnt_idmap(old_path->mnt),
rd.old_parent = old_parent,
rd.old_dentry = old_child,
- rd.new_mnt_idmap = mnt_idmap(new_path.mnt),
rd.new_parent = new_path.dentry,
rd.new_dentry = new_dentry,
rd.flags = flags,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1948b2c828d3..d3e27da8a6aa 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2005,20 +2005,18 @@ int vfs_unlink(struct mnt_idmap *, struct inode *, struct dentry *,
/**
* struct renamedata - contains all information required for renaming
- * @old_mnt_idmap: idmap of the old mount the inode was found from
+ * @mnt_idmap: idmap of the mount in which the rename is happening.
* @old_parent: parent of source
* @old_dentry: source
- * @new_mnt_idmap: idmap of the new mount the inode was found from
* @new_parent: parent of destination
* @new_dentry: destination
* @delegated_inode: returns an inode needing a delegation break
* @flags: rename flags
*/
struct renamedata {
- struct mnt_idmap *old_mnt_idmap;
+ struct mnt_idmap *mnt_idmap;
struct dentry *old_parent;
struct dentry *old_dentry;
- struct mnt_idmap *new_mnt_idmap;
struct dentry *new_parent;
struct dentry *new_dentry;
struct inode **delegated_inode;
--
2.49.0
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