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namei: rename follow_link to trailing_symlink, move it down

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-04-22 13:46:57 -04:00
parent 21fef2176e
commit 95fa25d9f2
1 changed files with 30 additions and 32 deletions
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62
fs/namei.c
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@ -668,8 +668,6 @@ static __always_inline void set_root(struct nameidata *nd)
get_fs_root(current->fs, &nd->root); get_fs_root(current->fs, &nd->root);
} }
static int link_path_walk(const char *, struct nameidata *);
static __always_inline unsigned set_root_rcu(struct nameidata *nd) static __always_inline unsigned set_root_rcu(struct nameidata *nd)
{ {
struct fs_struct *fs = current->fs; struct fs_struct *fs = current->fs;
@ -880,33 +878,6 @@ get_link(struct path *link, struct nameidata *nd, void **p)
return res; return res;
} }
static int follow_link(struct path *link, struct nameidata *nd, void **p)
{
const char *s;
int error = may_follow_link(link, nd);
if (unlikely(error))
return error;
nd->flags |= LOOKUP_PARENT;
s = get_link(link, nd, p);
if (unlikely(IS_ERR(s)))
return PTR_ERR(s);
if (unlikely(!s))
return 0;
if (*s == '/') {
if (!nd->root.mnt)
set_root(nd);
path_put(&nd->path);
nd->path = nd->root;
path_get(&nd->root);
nd->flags |= LOOKUP_JUMPED;
}
nd->inode = nd->path.dentry->d_inode;
error = link_path_walk(s, nd);
if (unlikely(error))
put_link(nd, link, *p);
return error;
}
static int follow_up_rcu(struct path *path) static int follow_up_rcu(struct path *path)
{ {
struct mount *mnt = real_mount(path->mnt); struct mount *mnt = real_mount(path->mnt);
@ -1970,6 +1941,33 @@ static void path_cleanup(struct nameidata *nd)
fput(nd->base); fput(nd->base);
} }
static int trailing_symlink(struct path *link, struct nameidata *nd, void **p)
{
const char *s;
int error = may_follow_link(link, nd);
if (unlikely(error))
return error;
nd->flags |= LOOKUP_PARENT;
s = get_link(link, nd, p);
if (unlikely(IS_ERR(s)))
return PTR_ERR(s);
if (unlikely(!s))
return 0;
if (*s == '/') {
if (!nd->root.mnt)
set_root(nd);
path_put(&nd->path);
nd->path = nd->root;
path_get(&nd->root);
nd->flags |= LOOKUP_JUMPED;
}
nd->inode = nd->path.dentry->d_inode;
error = link_path_walk(s, nd);
if (unlikely(error))
put_link(nd, link, *p);
return error;
}
static inline int lookup_last(struct nameidata *nd) static inline int lookup_last(struct nameidata *nd)
{ {
if (nd->last_type == LAST_NORM && nd->last.name[nd->last.len]) if (nd->last_type == LAST_NORM && nd->last.name[nd->last.len])
@ -2005,7 +2003,7 @@ static int path_lookupat(int dfd, const struct filename *name,
while (err > 0) { while (err > 0) {
void *cookie; void *cookie;
struct path link = nd->link; struct path link = nd->link;
err = follow_link(&link, nd, &cookie); err = trailing_symlink(&link, nd, &cookie);
if (err) if (err)
break; break;
err = lookup_last(nd); err = lookup_last(nd);
@ -2351,7 +2349,7 @@ path_mountpoint(int dfd, const struct filename *name, struct path *path,
while (err > 0) { while (err > 0) {
void *cookie; void *cookie;
struct path link = *path; struct path link = *path;
err = follow_link(&link, nd, &cookie); err = trailing_symlink(&link, nd, &cookie);
if (err) if (err)
break; break;
err = mountpoint_last(nd, path); err = mountpoint_last(nd, path);
@ -3235,7 +3233,7 @@ static struct file *path_openat(int dfd, struct filename *pathname,
struct path link = nd->link; struct path link = nd->link;
void *cookie; void *cookie;
nd->flags &= ~(LOOKUP_OPEN|LOOKUP_CREATE|LOOKUP_EXCL); nd->flags &= ~(LOOKUP_OPEN|LOOKUP_CREATE|LOOKUP_EXCL);
error = follow_link(&link, nd, &cookie); error = trailing_symlink(&link, nd, &cookie);
if (unlikely(error)) if (unlikely(error))
break; break;
error = do_last(nd, file, op, &opened, pathname); error = do_last(nd, file, op, &opened, pathname);