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authorAl Viro <viro@zeniv.linux.org.uk>2018-04-06 16:32:38 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2018-04-06 16:33:40 -0400
commit3c95f0dce82186de657d828cce420daa0edd9a19 (patch)
treea97f43784db48e3f50309aa1c3db78a099926976 /fs/namei.c
parent04bbc9795d2e89c79edf48fb1303ace2e8c90a60 (diff)
downloadlinux-stericsson-3c95f0dce82186de657d828cce420daa0edd9a19.tar.gz
merge common parts of lookup_one_len{,_unlocked} into common helper
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c90
1 files changed, 34 insertions, 56 deletions
diff --git a/fs/namei.c b/fs/namei.c
index a3cd028e8a9b..b803c6c6ac95 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2417,52 +2417,57 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
}
EXPORT_SYMBOL(vfs_path_lookup);
-/**
- * lookup_one_len - filesystem helper to lookup single pathname component
- * @name: pathname component to lookup
- * @base: base directory to lookup from
- * @len: maximum length @len should be interpreted to
- *
- * Note that this routine is purely a helper for filesystem usage and should
- * not be called by generic code.
- *
- * The caller must hold base->i_mutex.
- */
-struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
+static int lookup_one_len_common(const char *name, struct dentry *base,
+ int len, struct qstr *this)
{
- struct qstr this;
- unsigned int c;
- int err;
-
- WARN_ON_ONCE(!inode_is_locked(base->d_inode));
-
- this.name = name;
- this.len = len;
- this.hash = full_name_hash(base, name, len);
+ this->name = name;
+ this->len = len;
+ this->hash = full_name_hash(base, name, len);
if (!len)
- return ERR_PTR(-EACCES);
+ return -EACCES;
if (unlikely(name[0] == '.')) {
if (len < 2 || (len == 2 && name[1] == '.'))
- return ERR_PTR(-EACCES);
+ return -EACCES;
}
while (len--) {
- c = *(const unsigned char *)name++;
+ unsigned int c = *(const unsigned char *)name++;
if (c == '/' || c == '\0')
- return ERR_PTR(-EACCES);
+ return -EACCES;
}
/*
* See if the low-level filesystem might want
* to use its own hash..
*/
if (base->d_flags & DCACHE_OP_HASH) {
- int err = base->d_op->d_hash(base, &this);
+ int err = base->d_op->d_hash(base, this);
if (err < 0)
- return ERR_PTR(err);
+ return err;
}
- err = inode_permission(base->d_inode, MAY_EXEC);
+ return inode_permission(base->d_inode, MAY_EXEC);
+}
+
+/**
+ * lookup_one_len - filesystem helper to lookup single pathname component
+ * @name: pathname component to lookup
+ * @base: base directory to lookup from
+ * @len: maximum length @len should be interpreted to
+ *
+ * Note that this routine is purely a helper for filesystem usage and should
+ * not be called by generic code.
+ *
+ * The caller must hold base->i_mutex.
+ */
+struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
+{
+ struct qstr this;
+ int err;
+
+ WARN_ON_ONCE(!inode_is_locked(base->d_inode));
+
+ err = lookup_one_len_common(name, base, len, &this);
if (err)
return ERR_PTR(err);
@@ -2486,37 +2491,10 @@ struct dentry *lookup_one_len_unlocked(const char *name,
struct dentry *base, int len)
{
struct qstr this;
- unsigned int c;
int err;
struct dentry *ret;
- this.name = name;
- this.len = len;
- this.hash = full_name_hash(base, name, len);
- if (!len)
- return ERR_PTR(-EACCES);
-
- if (unlikely(name[0] == '.')) {
- if (len < 2 || (len == 2 && name[1] == '.'))
- return ERR_PTR(-EACCES);
- }
-
- while (len--) {
- c = *(const unsigned char *)name++;
- if (c == '/' || c == '\0')
- return ERR_PTR(-EACCES);
- }
- /*
- * See if the low-level filesystem might want
- * to use its own hash..
- */
- if (base->d_flags & DCACHE_OP_HASH) {
- int err = base->d_op->d_hash(base, &this);
- if (err < 0)
- return ERR_PTR(err);
- }
-
- err = inode_permission(base->d_inode, MAY_EXEC);
+ err = lookup_one_len_common(name, base, len, &this);
if (err)
return ERR_PTR(err);