jenna
/
kernel_samsung_sm7125
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

vfs: spread struct mount - clone_mnt/copy_tree argument

Browse Source 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
tirimbino
Al Viro 13 years ago
parent 692afc312b
commit 87129cc0e3
3 changed files with 35 additions and 32 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 63
      fs/namespace.c
  2. 2
      fs/pnode.c
  3. 2
      fs/pnode.h

63
fs/namespace.c
Unescape View File

@ -687,17 +687,17 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
}
EXPORT_SYMBOL_GPL(vfs_kern_mount);
static struct mount *clone_mnt(struct vfsmount *old, struct dentry *root,
static struct mount *clone_mnt(struct mount *old, struct dentry *root,
int flag)
{
struct super_block *sb = old->mnt_sb;
struct mount *mnt = alloc_vfsmnt(old->mnt_devname);
struct super_block *sb = old->mnt.mnt_sb;
struct mount *mnt = alloc_vfsmnt(old->mnt.mnt_devname);
if (mnt) {
if (flag & (CL_SLAVE | CL_PRIVATE))
mnt->mnt.mnt_group_id = 0; /* not a peer of original */
else
mnt->mnt.mnt_group_id = old->mnt_group_id;
mnt->mnt.mnt_group_id = old->mnt.mnt_group_id;
if ((flag & CL_MAKE_SHARED) && !mnt->mnt.mnt_group_id) {
int err = mnt_alloc_group_id(mnt);
@ -705,7 +705,7 @@ static struct mount *clone_mnt(struct vfsmount *old, struct dentry *root,
goto out_free;
}
mnt->mnt.mnt_flags = old->mnt_flags & ~MNT_WRITE_HOLD;
mnt->mnt.mnt_flags = old->mnt.mnt_flags & ~MNT_WRITE_HOLD;
atomic_inc(&sb->s_active);
mnt->mnt.mnt_sb = sb;
mnt->mnt.mnt_root = dget(root);
@ -713,15 +713,15 @@ static struct mount *clone_mnt(struct vfsmount *old, struct dentry *root,
mnt->mnt.mnt_parent = &mnt->mnt;
if (flag & CL_SLAVE) {
list_add(&mnt->mnt.mnt_slave, &old->mnt_slave_list);
mnt->mnt.mnt_master = old;
list_add(&mnt->mnt.mnt_slave, &old->mnt.mnt_slave_list);
mnt->mnt.mnt_master = &old->mnt;
CLEAR_MNT_SHARED(&mnt->mnt);
} else if (!(flag & CL_PRIVATE)) {
if ((flag & CL_MAKE_SHARED) || IS_MNT_SHARED(old))
list_add(&mnt->mnt.mnt_share, &old->mnt_share);
if (IS_MNT_SLAVE(old))
list_add(&mnt->mnt.mnt_slave, &old->mnt_slave);
mnt->mnt.mnt_master = old->mnt_master;
if ((flag & CL_MAKE_SHARED) || IS_MNT_SHARED(&old->mnt))
list_add(&mnt->mnt.mnt_share, &old->mnt.mnt_share);
if (IS_MNT_SLAVE(&old->mnt))
list_add(&mnt->mnt.mnt_slave, &old->mnt.mnt_slave);
mnt->mnt.mnt_master = old->mnt.mnt_master;
}
if (flag & CL_MAKE_SHARED)
set_mnt_shared(mnt);
@ -729,8 +729,8 @@ static struct mount *clone_mnt(struct vfsmount *old, struct dentry *root,
/* stick the duplicate mount on the same expiry list
* as the original if that was on one */
if (flag & CL_EXPIRE) {
if (!list_empty(&old->mnt_expire))
list_add(&mnt->mnt.mnt_expire, &old->mnt_expire);
if (!list_empty(&old->mnt.mnt_expire))
list_add(&mnt->mnt.mnt_expire, &old->mnt.mnt_expire);
}
}
return mnt;
@ -1408,23 +1408,23 @@ static int mount_is_safe(struct path *path)
#endif
}
struct mount *copy_tree(struct vfsmount *mnt, struct dentry *dentry,
struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,
int flag)
{
struct mount *res, *q;
struct vfsmount *p, *r;
struct mount *res, *p, *q;
struct vfsmount *r;
struct path path;
if (!(flag & CL_COPY_ALL) && IS_MNT_UNBINDABLE(mnt))
if (!(flag & CL_COPY_ALL) && IS_MNT_UNBINDABLE(&mnt->mnt))
return NULL;
res = q = clone_mnt(mnt, dentry, flag);
if (!q)
goto Enomem;
q->mnt.mnt_mountpoint = mnt->mnt_mountpoint;
q->mnt.mnt_mountpoint = mnt->mnt.mnt_mountpoint;
p = mnt;
list_for_each_entry(r, &mnt->mnt_mounts, mnt_child) {
list_for_each_entry(r, &mnt->mnt.mnt_mounts, mnt_child) {
struct mount *s;
if (!is_subdir(r->mnt_mountpoint, dentry))
continue;
@ -1434,14 +1434,14 @@ struct mount *copy_tree(struct vfsmount *mnt, struct dentry *dentry,
s = skip_mnt_tree(s);
continue;
}
while (p != s->mnt.mnt_parent) {
p = p->mnt_parent;
while (p != real_mount(s->mnt.mnt_parent)) {
p = real_mount(p->mnt.mnt_parent);
q = real_mount(q->mnt.mnt_parent);
}
p = &s->mnt;
p = s;
path.mnt = &q->mnt;
path.dentry = p->mnt_mountpoint;
q = clone_mnt(p, p->mnt_root, flag);
path.dentry = p->mnt.mnt_mountpoint;
q = clone_mnt(p, p->mnt.mnt_root, flag);
if (!q)
goto Enomem;
br_write_lock(vfsmount_lock);
@ -1466,7 +1466,8 @@ struct vfsmount *collect_mounts(struct path *path)
{
struct mount *tree;
down_write(&namespace_sem);
tree = copy_tree(path->mnt, path->dentry, CL_COPY_ALL | CL_PRIVATE);
tree = copy_tree(real_mount(path->mnt), path->dentry,
CL_COPY_ALL | CL_PRIVATE);
up_write(&namespace_sem);
return tree ? &tree->mnt : NULL;
}
@ -1740,7 +1741,7 @@ static int do_loopback(struct path *path, char *old_name,
{
LIST_HEAD(umount_list);
struct path old_path;
struct mount *mnt = NULL;
struct mount *mnt = NULL, *old;
int err = mount_is_safe(path);
if (err)
return err;
@ -1754,6 +1755,8 @@ static int do_loopback(struct path *path, char *old_name,
if (err)
goto out;
old = real_mount(old_path.mnt);
err = -EINVAL;
if (IS_MNT_UNBINDABLE(old_path.mnt))
goto out2;
@ -1763,9 +1766,9 @@ static int do_loopback(struct path *path, char *old_name,
err = -ENOMEM;
if (recurse)
mnt = copy_tree(old_path.mnt, old_path.dentry, 0);
mnt = copy_tree(old, old_path.dentry, 0);
else
mnt = clone_mnt(old_path.mnt, old_path.dentry, 0);
mnt = clone_mnt(old, old_path.dentry, 0);
if (!mnt)
goto out2;
@ -2394,7 +2397,7 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
down_write(&namespace_sem);
/* First pass: copy the tree topology */
new = copy_tree(mnt_ns->root, mnt_ns->root->mnt_root,
new = copy_tree(real_mount(mnt_ns->root), mnt_ns->root->mnt_root,
CL_COPY_ALL | CL_EXPIRE);
if (!new) {
up_write(&namespace_sem);

2
fs/pnode.c
Unescape View File

@ -239,7 +239,7 @@ int propagate_mnt(struct vfsmount *dest_mnt, struct dentry *dest_dentry,
source = get_source(m, prev_dest_mnt, prev_src_mnt, &type);
if (!(child = copy_tree(source, source->mnt_root, type))) {
if (!(child = copy_tree(real_mount(source), source->mnt_root, type))) {
ret = -ENOMEM;
list_splice(tree_list, tmp_list.prev);
goto out;

2
fs/pnode.h
Unescape View File

@ -41,7 +41,7 @@ void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
struct vfsmount *);
void release_mounts(struct list_head *);
void umount_tree(struct mount *, int, struct list_head *);
struct mount *copy_tree(struct vfsmount *, struct dentry *, int);
struct mount *copy_tree(struct mount *, struct dentry *, int);
bool is_path_reachable(struct vfsmount *, struct dentry *,
const struct path *root);
#endif /* _LINUX_PNODE_H */

Write Preview
Loading…
Cancel
Save