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namei: massage lookup_slow() to be usable by lookup_one_len_unlocked()

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Return dentry and don't pass nameidata or path; lift crossing mountpoints
into the caller.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-03-06 14:03:27 -05:00
parent d6d95ded91
commit e3c1392808
1 changed files with 24 additions and 32 deletions
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56
fs/namei.c
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@ -1445,7 +1445,8 @@ static int follow_dotdot(struct nameidata *nd)
* allocates a new one if not found or not valid. In the need_lookup argument
* returns whether i_op->lookup is necessary.
*/
static struct dentry *lookup_dcache(struct qstr *name, struct dentry *dir,
static struct dentry *lookup_dcache(const struct qstr *name,
struct dentry *dir,
unsigned int flags)
{
struct dentry *dentry;
@ -1491,7 +1492,7 @@ static struct dentry *lookup_real(struct inode *dir, struct dentry *dentry,
return dentry;
}
static struct dentry *__lookup_hash(struct qstr *name,
static struct dentry *__lookup_hash(const struct qstr *name,
struct dentry *base, unsigned int flags)
{
struct dentry *dentry = lookup_dcache(name, base, flags);
@ -1598,21 +1599,15 @@ static int lookup_fast(struct nameidata *nd,
}
/* Fast lookup failed, do it the slow way */
static int lookup_slow(struct nameidata *nd, struct path *path)
static struct dentry *lookup_slow(const struct qstr *name,
struct dentry *dir,
unsigned int flags)
{
struct dentry *dentry, *parent;
parent = nd->path.dentry;
BUG_ON(nd->inode != parent->d_inode);
inode_lock(parent->d_inode);
dentry = __lookup_hash(&nd->last, parent, nd->flags);
inode_unlock(parent->d_inode);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
path->mnt = nd->path.mnt;
path->dentry = dentry;
return follow_managed(path, nd);
struct dentry *dentry;
inode_lock(dir->d_inode);
dentry = __lookup_hash(name, dir, flags);
inode_unlock(dir->d_inode);
return dentry;
}
static inline int may_lookup(struct nameidata *nd)
@ -1719,15 +1714,20 @@ static int walk_component(struct nameidata *nd, int flags)
if (unlikely(err <= 0)) {
if (err < 0)
return err;
err = lookup_slow(nd, &path);
if (err < 0)
path.dentry = lookup_slow(&nd->last, nd->path.dentry,
nd->flags);
if (IS_ERR(path.dentry))
return PTR_ERR(path.dentry);
if (unlikely(d_is_negative(path.dentry))) {
dput(path.dentry);
return -ENOENT;
}
path.mnt = nd->path.mnt;
err = follow_managed(&path, nd);
if (unlikely(err < 0))
return err;
seq = 0; /* we are already out of RCU mode */
err = -ENOENT;
if (d_is_negative(path.dentry))
goto out_path_put;
inode = d_backing_inode(path.dentry);
}
@ -1740,10 +1740,6 @@ static int walk_component(struct nameidata *nd, int flags)
nd->inode = inode;
nd->seq = seq;
return 0;
out_path_put:
path_to_nameidata(&path, nd);
return err;
}
/*
@ -2350,12 +2346,8 @@ struct dentry *lookup_one_len_unlocked(const char *name,
return ERR_PTR(err);
ret = lookup_dcache(&this, base, 0);
if (ret)
return ret;
inode_lock(base->d_inode);
ret = __lookup_hash(&this, base, 0);
inode_unlock(base->d_inode);
if (!ret)
ret = lookup_slow(&this, base, 0);
return ret;
}
EXPORT_SYMBOL(lookup_one_len_unlocked);