From 3c95f0dce82186de657d828cce420daa0edd9a19 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Fri, 6 Apr 2018 16:32:38 -0400 Subject: [PATCH] merge common parts of lookup_one_len{,_unlocked} into common helper Signed-off-by: Al Viro --- fs/namei.c | 90 +++++++++++++++++++++--------------------------------- 1 file 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); -- 2.30.2