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namei: split off filename_lookupat() with LOOKUP_PARENT

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new functions: filename_parentat() and path_parentat() resp.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-05-08 16:59:20 -04:00
parent b5cd339762
commit 8bcb77fabd
1 changed files with 33 additions and 4 deletions
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37
fs/namei.c
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@ -2034,7 +2034,7 @@ static int path_lookupat(int dfd, const struct filename *name,
* be able to complete).
*/
err = path_init(dfd, name, flags, nd);
if (!err && !(flags & LOOKUP_PARENT)) {
if (!err) {
while ((err = lookup_last(nd)) > 0) {
err = trailing_symlink(nd);
if (err)
@ -2074,6 +2074,35 @@ static int filename_lookup(int dfd, struct filename *name,
return retval;
}
/* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
static int path_parentat(int dfd, const struct filename *name,
unsigned int flags, struct nameidata *nd)
{
int err = path_init(dfd, name, flags | LOOKUP_PARENT, nd);
if (!err)
err = complete_walk(nd);
path_cleanup(nd);
return err;
}
static int filename_parentat(int dfd, struct filename *name,
unsigned int flags, struct nameidata *nd)
{
int retval;
struct nameidata *saved_nd = set_nameidata(nd);
retval = path_parentat(dfd, name, flags | LOOKUP_RCU, nd);
if (unlikely(retval == -ECHILD))
retval = path_parentat(dfd, name, flags, nd);
if (unlikely(retval == -ESTALE))
retval = path_parentat(dfd, name, flags | LOOKUP_REVAL, nd);
if (likely(!retval))
audit_inode(name, nd->path.dentry, LOOKUP_PARENT);
restore_nameidata(saved_nd);
return retval;
}
/* does lookup, returns the object with parent locked */
struct dentry *kern_path_locked(const char *name, struct path *path)
{
@ -2085,7 +2114,7 @@ struct dentry *kern_path_locked(const char *name, struct path *path)
if (IS_ERR(filename))
return ERR_CAST(filename);
err = filename_lookup(AT_FDCWD, filename, LOOKUP_PARENT, &nd);
err = filename_parentat(AT_FDCWD, filename, 0, &nd);
if (err) {
d = ERR_PTR(err);
goto out;
@ -2255,7 +2284,7 @@ user_path_parent(int dfd, const char __user *path,
if (IS_ERR(s))
return s;
error = filename_lookup(dfd, s, flags | LOOKUP_PARENT, &nd);
error = filename_parentat(dfd, s, flags, &nd);
if (error) {
putname(s);
return ERR_PTR(error);
@ -3344,7 +3373,7 @@ static struct dentry *filename_create(int dfd, struct filename *name,
*/
lookup_flags &= LOOKUP_REVAL;
error = filename_lookup(dfd, name, LOOKUP_PARENT|lookup_flags, &nd);
error = filename_parentat(dfd, name, lookup_flags, &nd);
if (error)
return ERR_PTR(error);