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path_init(): store the "base" pointer to file in nameidata itself

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-11-20 14:14:42 -05:00
parent bd9b51e79c
commit 5e53084d77
1 changed files with 13 additions and 14 deletions
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27
fs/namei.c
View file

@ -496,6 +496,7 @@ struct nameidata {
unsigned seq, m_seq;
int last_type;
unsigned depth;
struct file *base;
char *saved_names[MAX_NESTED_LINKS + 1];
};
@ -1845,13 +1846,14 @@ static int link_path_walk(const char *name, struct nameidata *nd)
}
static int path_init(int dfd, const char *name, unsigned int flags,
struct nameidata *nd, struct file **fp)
struct nameidata *nd)
{
int retval = 0;
nd->last_type = LAST_ROOT; /* if there are only slashes... */
nd->flags = flags | LOOKUP_JUMPED;
nd->depth = 0;
nd->base = NULL;
if (flags & LOOKUP_ROOT) {
struct dentry *root = nd->root.dentry;
struct inode *inode = root->d_inode;
@ -1921,7 +1923,7 @@ static int path_init(int dfd, const char *name, unsigned int flags,
nd->path = f.file->f_path;
if (flags & LOOKUP_RCU) {
if (f.flags & FDPUT_FPUT)
*fp = f.file;
nd->base = f.file;
nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq);
rcu_read_lock();
} else {
@ -1954,7 +1956,6 @@ static inline int lookup_last(struct nameidata *nd, struct path *path)
static int path_lookupat(int dfd, const char *name,
unsigned int flags, struct nameidata *nd)
{
struct file *base = NULL;
struct path path;
int err;
@ -1972,7 +1973,7 @@ static int path_lookupat(int dfd, const char *name,
* be handled by restarting a traditional ref-walk (which will always
* be able to complete).
*/
err = path_init(dfd, name, flags | LOOKUP_PARENT, nd, &base);
err = path_init(dfd, name, flags | LOOKUP_PARENT, nd);
if (unlikely(err))
goto out;
@ -2008,8 +2009,8 @@ static int path_lookupat(int dfd, const char *name,
}
out:
if (base)
fput(base);
if (nd->base)
fput(nd->base);
if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) {
path_put(&nd->root);
@ -2321,11 +2322,10 @@ out:
static int
path_mountpoint(int dfd, const char *name, struct path *path, unsigned int flags)
{
struct file *base = NULL;
struct nameidata nd;
int err;
err = path_init(dfd, name, flags | LOOKUP_PARENT, &nd, &base);
err = path_init(dfd, name, flags | LOOKUP_PARENT, &nd);
if (unlikely(err))
goto out;
@ -2349,8 +2349,8 @@ path_mountpoint(int dfd, const char *name, struct path *path, unsigned int flags
put_link(&nd, &link, cookie);
}
out:
if (base)
fput(base);
if (nd.base)
fput(nd.base);
if (nd.root.mnt && !(nd.flags & LOOKUP_ROOT))
path_put(&nd.root);
@ -3205,7 +3205,6 @@ out:
static struct file *path_openat(int dfd, struct filename *pathname,
struct nameidata *nd, const struct open_flags *op, int flags)
{
struct file *base = NULL;
struct file *file;
struct path path;
int opened = 0;
@ -3222,7 +3221,7 @@ static struct file *path_openat(int dfd, struct filename *pathname,
goto out;
}
error = path_init(dfd, pathname->name, flags | LOOKUP_PARENT, nd, &base);
error = path_init(dfd, pathname->name, flags | LOOKUP_PARENT, nd);
if (unlikely(error))
goto out;
@ -3255,8 +3254,8 @@ static struct file *path_openat(int dfd, struct filename *pathname,
out:
if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT))
path_put(&nd->root);
if (base)
fput(base);
if (nd->base)
fput(nd->base);
if (!(opened & FILE_OPENED)) {
BUG_ON(!error);
put_filp(file);