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[72.132.29.68]) by smtp.gmail.com with ESMTPSA id x125sm14516720pgb.35.2021.01.24.20.38.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 24 Jan 2021 20:38:20 -0800 (PST) Subject: Re: [PATCH 1/2] fs: make do_mkdirat() take struct filename To: Dmitry Kadashev , io-uring@vger.kernel.org Cc: viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org References: <20201116044529.1028783-1-dkadashev@gmail.com> <20201116044529.1028783-2-dkadashev@gmail.com> From: Jens Axboe Message-ID: <027e8488-2654-12cd-d525-37f249954b4d@kernel.dk> Date: Sun, 24 Jan 2021 21:38:19 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201116044529.1028783-2-dkadashev@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 11/15/20 9:45 PM, Dmitry Kadashev wrote: > Pass in the struct filename pointers instead of the user string, and > update the three callers to do the same. This is heavily based on > commit dbea8d345177 ("fs: make do_renameat2() take struct filename"). > > This behaves like do_unlinkat() and do_renameat2(). Al, are you OK with this patch? Leaving it quoted, though you should have the original too. > > Signed-off-by: Dmitry Kadashev > --- > fs/internal.h | 1 + > fs/namei.c | 20 ++++++++++++++------ > 2 files changed, 15 insertions(+), 6 deletions(-) > > diff --git a/fs/internal.h b/fs/internal.h > index 6fd14ea213c3..23b8b427dbd2 100644 > --- a/fs/internal.h > +++ b/fs/internal.h > @@ -80,6 +80,7 @@ long do_unlinkat(int dfd, struct filename *name); > int may_linkat(struct path *link); > int do_renameat2(int olddfd, struct filename *oldname, int newdfd, > struct filename *newname, unsigned int flags); > +long do_mkdirat(int dfd, struct filename *name, umode_t mode); > > /* > * namespace.c > diff --git a/fs/namei.c b/fs/namei.c > index 03d0e11e4f36..9d26a51f3f54 100644 > --- a/fs/namei.c > +++ b/fs/namei.c > @@ -3654,17 +3654,23 @@ int vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) > } > EXPORT_SYMBOL(vfs_mkdir); > > -static long do_mkdirat(int dfd, const char __user *pathname, umode_t mode) > +long do_mkdirat(int dfd, struct filename *name, umode_t mode) > { > struct dentry *dentry; > struct path path; > int error; > unsigned int lookup_flags = LOOKUP_DIRECTORY; > > + if (IS_ERR(name)) > + return PTR_ERR(name); > + > retry: > - dentry = user_path_create(dfd, pathname, &path, lookup_flags); > - if (IS_ERR(dentry)) > - return PTR_ERR(dentry); > + name->refcnt++; /* filename_create() drops our ref */ > + dentry = filename_create(dfd, name, &path, lookup_flags); > + if (IS_ERR(dentry)) { > + error = PTR_ERR(dentry); > + goto out; > + } > > if (!IS_POSIXACL(path.dentry->d_inode)) > mode &= ~current_umask(); > @@ -3676,17 +3682,19 @@ static long do_mkdirat(int dfd, const char __user *pathname, umode_t mode) > lookup_flags |= LOOKUP_REVAL; > goto retry; > } > +out: > + putname(name); > return error; > } > > SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode) > { > - return do_mkdirat(dfd, pathname, mode); > + return do_mkdirat(dfd, getname(pathname), mode); > } > > SYSCALL_DEFINE2(mkdir, const char __user *, pathname, umode_t, mode) > { > - return do_mkdirat(AT_FDCWD, pathname, mode); > + return do_mkdirat(AT_FDCWD, getname(pathname), mode); > } > > int vfs_rmdir(struct inode *dir, struct dentry *dentry) > -- Jens Axboe