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d_path: prepend_path(): get rid of vfsmnt

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it's kept equal to &mnt->mnt all along.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2021-05-12 16:24:12 -04:00
parent ad08ae5865
commit 7c0d552fd5
1 changed files with 4 additions and 7 deletions
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11
fs/d_path.c
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@ -90,7 +90,6 @@ static int prepend_path(const struct path *path,
struct prepend_buffer *p) struct prepend_buffer *p)
{ {
struct dentry *dentry; struct dentry *dentry;
struct vfsmount *vfsmnt;
struct mount *mnt; struct mount *mnt;
int error = 0; int error = 0;
unsigned seq, m_seq = 0; unsigned seq, m_seq = 0;
@ -105,18 +104,17 @@ static int prepend_path(const struct path *path,
b = *p; b = *p;
error = 0; error = 0;
dentry = path->dentry; dentry = path->dentry;
vfsmnt = path->mnt; mnt = real_mount(path->mnt);
mnt = real_mount(vfsmnt);
read_seqbegin_or_lock(&rename_lock, &seq); read_seqbegin_or_lock(&rename_lock, &seq);
while (dentry != root->dentry || vfsmnt != root->mnt) { while (dentry != root->dentry || &mnt->mnt != root->mnt) {
struct dentry * parent; struct dentry * parent;
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { if (dentry == mnt->mnt.mnt_root || IS_ROOT(dentry)) {
struct mount *parent = READ_ONCE(mnt->mnt_parent); struct mount *parent = READ_ONCE(mnt->mnt_parent);
struct mnt_namespace *mnt_ns; struct mnt_namespace *mnt_ns;
/* Escaped? */ /* Escaped? */
if (dentry != vfsmnt->mnt_root) { if (dentry != mnt->mnt.mnt_root) {
b = *p; b = *p;
error = 3; error = 3;
break; break;
@ -125,7 +123,6 @@ static int prepend_path(const struct path *path,
if (mnt != parent) { if (mnt != parent) {
dentry = READ_ONCE(mnt->mnt_mountpoint); dentry = READ_ONCE(mnt->mnt_mountpoint);
mnt = parent; mnt = parent;
vfsmnt = &mnt->mnt;
continue; continue;
} }
mnt_ns = READ_ONCE(mnt->mnt_ns); mnt_ns = READ_ONCE(mnt->mnt_ns);