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Kumar" , "Matthew R. Ochs" , Uma Krishnan , "James E.J. Bottomley" , "Martin K. Petersen" , Felipe Balbi , Alexander Viro , Ian Kent , Joel Becker , Christoph Hellwig , "Rafael J. Wysocki" , Matthew Garrett , Ard Biesheuvel , Miklos Szeredi , Mike Kravetz , Mark Fasheh , Joseph Qi , Alexey Dobriyan , Luis Chamberlain , Kees Cook , Iurii Zaikin , Anton Vorontsov , Colin Cross , Tony Luck , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , Andrii Nakryiko , John Fastabend , KP Singh , Hugh Dickins , Andrew Morton , "J. Bruce Fields" , Chuck Lever , Trond Myklebust , Anna Schumaker , "David S. Miller" , Jakub Kicinski , James Morris , "Serge E. Hallyn" , John Johansen , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, oprofile-list@lists.sf.net, linux-scsi@vger.kernel.org, linux-usb@vger.kernel.org, linux-fsdevel@vger.kernel.org, autofs@vger.kernel.org, linux-efi@vger.kernel.org, linux-mm@kvack.org, ocfs2-devel@oss.oracle.com, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 7/8] debugfs: switch to simplefs inode creation API Date: Tue, 14 Apr 2020 14:43:01 +0200 Message-Id: <20200414124304.4470-8-eesposit@redhat.com> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200414124304.4470-1-eesposit@redhat.com> References: <20200414124304.4470-1-eesposit@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The only difference, compared to the pre-existing code, is that symlink creation now triggers fsnotify_create. This was a bug in the debugfs code, since for example vfs_symlink does call fsnotify_create. Signed-off-by: Emanuele Giuseppe Esposito --- fs/debugfs/inode.c | 144 +++++---------------------------------------- 1 file changed, 15 insertions(+), 129 deletions(-) diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index 834b5872ca0d..7a2369373b85 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -294,68 +294,6 @@ struct dentry *debugfs_lookup(const char *name, struct= dentry *parent) } EXPORT_SYMBOL_GPL(debugfs_lookup); =20 -static struct dentry *start_creating(const char *name, struct dentry *pare= nt) -{ -=09struct dentry *dentry; -=09int error; - -=09pr_debug("creating file '%s'\n", name); - -=09if (IS_ERR(parent)) -=09=09return parent; - -=09error =3D simple_pin_fs(&debugfs, &debug_fs_type); -=09if (error) { -=09=09pr_err("Unable to pin filesystem for file '%s'\n", name); -=09=09return ERR_PTR(error); -=09} - -=09/* If the parent is not specified, we create it in the root. -=09 * We need the root dentry to do this, which is in the super -=09 * block. A pointer to that is in the struct vfsmount that we -=09 * have around. -=09 */ -=09if (!parent) -=09=09parent =3D debugfs.mount->mnt_root; - -=09inode_lock(d_inode(parent)); -=09if (unlikely(IS_DEADDIR(d_inode(parent)))) -=09=09dentry =3D ERR_PTR(-ENOENT); -=09else -=09=09dentry =3D lookup_one_len(name, parent, strlen(name)); -=09if (!IS_ERR(dentry) && d_really_is_positive(dentry)) { -=09=09if (d_is_dir(dentry)) -=09=09=09pr_err("Directory '%s' with parent '%s' already present!\n", -=09=09=09 name, parent->d_name.name); -=09=09else -=09=09=09pr_err("File '%s' in directory '%s' already present!\n", -=09=09=09 name, parent->d_name.name); -=09=09dput(dentry); -=09=09dentry =3D ERR_PTR(-EEXIST); -=09} - -=09if (IS_ERR(dentry)) { -=09=09inode_unlock(d_inode(parent)); -=09=09simple_release_fs(&debugfs); -=09} - -=09return dentry; -} - -static struct dentry *failed_creating(struct dentry *dentry) -{ -=09inode_unlock(d_inode(dentry->d_parent)); -=09dput(dentry); -=09simple_release_fs(&debugfs); -=09return ERR_PTR(-ENOMEM); -} - -static struct dentry *end_creating(struct dentry *dentry) -{ -=09inode_unlock(d_inode(dentry->d_parent)); -=09return dentry; -} - static struct dentry *__debugfs_create_file(const char *name, umode_t mode= , =09=09=09=09struct dentry *parent, void *data, =09=09=09=09const struct file_operations *proxy_fops, @@ -364,32 +302,17 @@ static struct dentry *__debugfs_create_file(const cha= r *name, umode_t mode, =09struct dentry *dentry; =09struct inode *inode; =20 -=09if (!(mode & S_IFMT)) -=09=09mode |=3D S_IFREG; -=09BUG_ON(!S_ISREG(mode)); -=09dentry =3D start_creating(name, parent); - +=09dentry =3D simplefs_create_file(&debugfs, &debug_fs_type, +=09=09=09=09 name, mode, parent, data, &inode); =09if (IS_ERR(dentry)) =09=09return dentry; =20 -=09inode =3D simple_new_inode(dentry->d_sb); -=09if (unlikely(!inode)) { -=09=09pr_err("out of free dentries, can not create file '%s'\n", -=09=09 name); -=09=09return failed_creating(dentry); -=09} - -=09inode->i_mode =3D mode; -=09inode->i_private =3D data; - =09inode->i_op =3D &debugfs_file_inode_operations; =09inode->i_fop =3D proxy_fops; =09dentry->d_fsdata =3D (void *)((unsigned long)real_fops | =09=09=09=09DEBUGFS_FSDATA_IS_REAL_FOPS_BIT); =20 -=09d_instantiate(dentry, inode); -=09fsnotify_create(d_inode(dentry->d_parent), dentry); -=09return end_creating(dentry); +=09return simplefs_finish_dentry(dentry, inode); } =20 /** @@ -522,29 +445,16 @@ EXPORT_SYMBOL_GPL(debugfs_create_file_size); */ struct dentry *debugfs_create_dir(const char *name, struct dentry *parent) { -=09struct dentry *dentry =3D start_creating(name, parent); +=09struct dentry *dentry; =09struct inode *inode; =20 +=09dentry =3D simplefs_create_dir(&debugfs, &debug_fs_type, +=09=09=09=09 name, 0755, parent, &inode); =09if (IS_ERR(dentry)) =09=09return dentry; =20 -=09inode =3D simple_new_inode(dentry->d_sb); -=09if (unlikely(!inode)) { -=09=09pr_err("out of free dentries, can not create directory '%s'\n", -=09=09 name); -=09=09return failed_creating(dentry); -=09} - -=09inode->i_mode =3D S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO; =09inode->i_op =3D &debugfs_dir_inode_operations; -=09inode->i_fop =3D &simple_dir_operations; - -=09/* directory inodes start off with i_nlink =3D=3D 2 (for "." entry) */ -=09inc_nlink(inode); -=09d_instantiate(dentry, inode); -=09inc_nlink(d_inode(dentry->d_parent)); -=09fsnotify_mkdir(d_inode(dentry->d_parent), dentry); -=09return end_creating(dentry); +=09return simplefs_finish_dentry(dentry, inode); } EXPORT_SYMBOL_GPL(debugfs_create_dir); =20 @@ -564,29 +474,19 @@ struct dentry *debugfs_create_automount(const char *n= ame, =09=09=09=09=09debugfs_automount_t f, =09=09=09=09=09void *data) { -=09struct dentry *dentry =3D start_creating(name, parent); +=09struct dentry *dentry; =09struct inode *inode; =20 +=09dentry =3D simplefs_create_dentry(&debugfs, &debug_fs_type, name, paren= t, +=09=09=09=09=09&inode); =09if (IS_ERR(dentry)) =09=09return dentry; =20 -=09inode =3D simple_new_inode(dentry->d_sb); -=09if (unlikely(!inode)) { -=09=09pr_err("out of free dentries, can not create automount '%s'\n", -=09=09 name); -=09=09return failed_creating(dentry); -=09} - =09make_empty_dir_inode(inode); =09inode->i_flags |=3D S_AUTOMOUNT; =09inode->i_private =3D data; =09dentry->d_fsdata =3D (void *)f; -=09/* directory inodes start off with i_nlink =3D=3D 2 (for "." entry) */ -=09inc_nlink(inode); -=09d_instantiate(dentry, inode); -=09inc_nlink(d_inode(dentry->d_parent)); -=09fsnotify_mkdir(d_inode(dentry->d_parent), dentry); -=09return end_creating(dentry); +=09return simplefs_finish_dentry(dentry, inode); } EXPORT_SYMBOL(debugfs_create_automount); =20 @@ -618,28 +518,14 @@ struct dentry *debugfs_create_symlink(const char *nam= e, struct dentry *parent, { =09struct dentry *dentry; =09struct inode *inode; -=09char *link =3D kstrdup(target, GFP_KERNEL); -=09if (!link) -=09=09return ERR_PTR(-ENOMEM); =20 -=09dentry =3D start_creating(name, parent); -=09if (IS_ERR(dentry)) { -=09=09kfree(link); +=09dentry =3D simplefs_create_symlink(&debugfs, &debug_fs_type, +=09=09=09=09=09 name, parent, target, &inode); +=09if (IS_ERR(dentry)) =09=09return dentry; -=09} =20 -=09inode =3D simple_new_inode(dentry->d_sb); -=09if (unlikely(!inode)) { -=09=09pr_err("out of free dentries, can not create symlink '%s'\n", -=09=09 name); -=09=09kfree(link); -=09=09return failed_creating(dentry); -=09} -=09inode->i_mode =3D S_IFLNK | S_IRWXUGO; =09inode->i_op =3D &debugfs_symlink_inode_operations; -=09inode->i_link =3D link; -=09d_instantiate(dentry, inode); -=09return end_creating(dentry); +=09return simplefs_finish_dentry(dentry, inode); } EXPORT_SYMBOL_GPL(debugfs_create_symlink); =20 --=20 2.25.2