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namei: shift nameidata inside filename_lookup()

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pass root instead; non-NULL => copy to nd.root and
set LOOKUP_ROOT in flags

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-05-12 16:44:39 -04:00
parent e4bd1c1a95
commit 9ad1aaa615
1 changed files with 14 additions and 16 deletions
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30
fs/namei.c
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@ -2119,17 +2119,20 @@ static int path_lookupat(int dfd, const struct filename *name, unsigned flags,
} }
static int filename_lookup(int dfd, struct filename *name, unsigned flags, static int filename_lookup(int dfd, struct filename *name, unsigned flags,
struct nameidata *nd, struct path *path) struct path *path, struct path *root)
{ {
int retval; int retval;
struct nameidata *saved_nd = set_nameidata(nd); struct nameidata nd, *saved_nd = set_nameidata(&nd);
if (unlikely(root)) {
retval = path_lookupat(dfd, name, flags | LOOKUP_RCU, nd, path); nd.root = *root;
flags |= LOOKUP_ROOT;
}
retval = path_lookupat(dfd, name, flags | LOOKUP_RCU, &nd, path);
if (unlikely(retval == -ECHILD)) if (unlikely(retval == -ECHILD))
retval = path_lookupat(dfd, name, flags, nd, path); retval = path_lookupat(dfd, name, flags, &nd, path);
if (unlikely(retval == -ESTALE)) if (unlikely(retval == -ESTALE))
retval = path_lookupat(dfd, name, flags | LOOKUP_REVAL, retval = path_lookupat(dfd, name, flags | LOOKUP_REVAL,
nd, path); &nd, path);
if (likely(!retval)) if (likely(!retval))
audit_inode(name, path->dentry, flags & LOOKUP_PARENT); audit_inode(name, path->dentry, flags & LOOKUP_PARENT);
@ -2209,11 +2212,10 @@ struct dentry *kern_path_locked(const char *name, struct path *path)
int kern_path(const char *name, unsigned int flags, struct path *path) int kern_path(const char *name, unsigned int flags, struct path *path)
{ {
struct nameidata nd;
struct filename *filename = getname_kernel(name); struct filename *filename = getname_kernel(name);
if (IS_ERR(filename)) if (IS_ERR(filename))
return PTR_ERR(filename); return PTR_ERR(filename);
return filename_lookup(AT_FDCWD, filename, flags, &nd, path); return filename_lookup(AT_FDCWD, filename, flags, path, NULL);
} }
EXPORT_SYMBOL(kern_path); EXPORT_SYMBOL(kern_path);
@ -2229,7 +2231,7 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
const char *name, unsigned int flags, const char *name, unsigned int flags,
struct path *path) struct path *path)
{ {
struct nameidata nd; struct path root = {.mnt = mnt, .dentry = dentry};
struct filename *filename = getname_kernel(name); struct filename *filename = getname_kernel(name);
BUG_ON(flags & LOOKUP_PARENT); BUG_ON(flags & LOOKUP_PARENT);
@ -2237,11 +2239,8 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
if (IS_ERR(filename)) if (IS_ERR(filename))
return PTR_ERR(filename); return PTR_ERR(filename);
nd.root.dentry = dentry; /* the first argument of filename_lookup() is ignored with root */
nd.root.mnt = mnt; return filename_lookup(AT_FDCWD, filename, flags , path, &root);
/* the first argument of filename_lookup() is ignored with LOOKUP_ROOT */
return filename_lookup(AT_FDCWD, filename,
flags | LOOKUP_ROOT, &nd, path);
} }
EXPORT_SYMBOL(vfs_path_lookup); EXPORT_SYMBOL(vfs_path_lookup);
@ -2299,14 +2298,13 @@ EXPORT_SYMBOL(lookup_one_len);
int user_path_at_empty(int dfd, const char __user *name, unsigned flags, int user_path_at_empty(int dfd, const char __user *name, unsigned flags,
struct path *path, int *empty) struct path *path, int *empty)
{ {
struct nameidata nd;
struct filename *tmp = getname_flags(name, flags, empty); struct filename *tmp = getname_flags(name, flags, empty);
if (IS_ERR(tmp)) if (IS_ERR(tmp))
return PTR_ERR(tmp); return PTR_ERR(tmp);
BUG_ON(flags & LOOKUP_PARENT); BUG_ON(flags & LOOKUP_PARENT);
return filename_lookup(dfd, tmp, flags, &nd, path); return filename_lookup(dfd, tmp, flags, path, NULL);
} }
int user_path_at(int dfd, const char __user *name, unsigned flags, int user_path_at(int dfd, const char __user *name, unsigned flags,