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Tue, 14 Apr 2020 05:44:23 -0700 (PDT) Received: from localhost.localdomain ([194.230.155.210]) by smtp.gmail.com with ESMTPSA id m14sm16948816wrs.76.2020.04.14.05.44.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Apr 2020 05:44:23 -0700 (PDT) From: Emanuele Giuseppe Esposito To: linux-nfs@vger.kernel.org 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 X-Proofpoint-SPF-Result: pass X-Proofpoint-SPF-Record: v=spf1 ip4:103.23.64.2 ip4:103.23.65.2 ip4:103.23.66.26 ip4:103.23.67.26 ip4:107.21.15.141 ip4:108.177.8.0/21 ip4:13.111.0.0/16 ip4:136.147.128.0/20 ip4:136.147.176.0/20 ip4:148.105.8.0/21 ip4:149.72.0.0/16 ip4:149.96.1.26 ip4:149.96.13.2 ip4:149.96.132.2 ip4:149.96.133.2 ip4:149.96.14.2 ip4:149.96.194.2 ip4:149.96.195.2 ip4:149.96.2.26 include:spf1.redhat.com -all X-Proofpoint-SPF-VenPass: Allowed X-PDR: PASS X-Source-IP: 207.211.31.120 X-ServerName: us-smtp-delivery-1.mimecast.com X-Proofpoint-SPF-Result: pass X-Proofpoint-SPF-Record: v=spf1 ip4:103.23.64.2 ip4:103.23.65.2 ip4:103.23.66.26 ip4:103.23.67.26 ip4:107.21.15.141 ip4:108.177.8.0/21 ip4:13.111.0.0/16 ip4:136.147.128.0/20 ip4:136.147.176.0/20 ip4:148.105.8.0/21 ip4:149.72.0.0/16 ip4:149.96.1.26 ip4:149.96.13.2 ip4:149.96.132.2 ip4:149.96.133.2 ip4:149.96.14.2 ip4:149.96.194.2 ip4:149.96.195.2 ip4:149.96.2.26 include:spf1.redhat.com -all X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9590 signatures=668686 X-Proofpoint-Spam-Details: rule=tap_spam_policies_safe policy=tap_spam_policies score=0 classifier= adjust=0 reason=safe scancount=1 engine=8.12.0-2003020000 definitions=main-2004140037 X-Spam: OrgSafeList X-SpamRule: orgsafelist X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 suspectscore=4 spamscore=0 adultscore=0 mlxscore=0 phishscore=0 mlxlogscore=986 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004140105 X-Mailman-Approved-At: Tue, 14 Apr 2020 05:45:19 -0700 Cc: Song Liu , linux-usb@vger.kernel.org, bpf@vger.kernel.org, "Rafael J. Wysocki" , David Airlie , Benjamin Herrenschmidt , Heiko Carstens , Alexei Starovoitov , dri-devel@lists.freedesktop.org, "J. Bruce Fields" , Hugh Dickins , Paul Mackerras , John Johansen , linux-s390@vger.kernel.org, Andrew Donnellan , Emanuele Giuseppe Esposito , Matthew Garrett , linux-efi@vger.kernel.org, Arnd Bergmann , Daniel Borkmann , Christian Borntraeger , linux-rdma@vger.kernel.org, Michael Ellerman , Anton Vorontsov , John Fastabend , James Morris , Ard Biesheuvel , Jason Gunthorpe , Doug Ledford , oprofile-list@lists.sf.net, Yonghong Song , Ian Kent , Andrii Nakryiko , Alexey Dobriyan , "Serge E. Hallyn" , netdev@vger.kernel.org, Robert Richter , Thomas Zimmermann , Vasily Gorbik , Tony Luck , Kees Cook , "James E.J. Bottomley" , autofs@vger.kernel.org, Maarten Lankhorst , Uma Krishnan , Maxime Ripard , linux-fsdevel@vger.kernel.org, "Manoj N. Kumar" , Alexander Viro , Jakub Kicinski , KP Singh , Trond Myklebust , "Matthew R. Ochs" , "David S. Miller" , Felipe Balbi , Mike Marciniszyn , Iurii Zaikin , linux-scsi@vger.kernel.org, linux-mm@kvack.org, Greg Kroah-Hartman , Dennis Dalessandro , Miklos Szeredi , linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Anna Schumaker , Luis Chamberlain , Chuck Lever , Jeremy Kerr , Daniel Vetter , Colin Cross , Frederic Barrat , Paolo Bonzini , Mike Kravetz , linuxppc-dev@lists.ozlabs.org, Martin KaFai Lau , ocfs2-devel@oss.oracle.com Subject: [Ocfs2-devel] [PATCH 7/8] debugfs: switch to simplefs inode creation API X-BeenThere: ocfs2-devel@oss.oracle.com X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: ocfs2-devel-bounces@oss.oracle.com Errors-To: ocfs2-devel-bounces@oss.oracle.com X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9590 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxlogscore=999 bulkscore=0 malwarescore=0 phishscore=0 mlxscore=0 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004140105 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9590 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 clxscore=1015 bulkscore=0 mlxscore=0 mlxlogscore=999 lowpriorityscore=0 impostorscore=0 adultscore=0 phishscore=0 spamscore=0 suspectscore=0 malwarescore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004140105 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); -static struct dentry *start_creating(const char *name, struct dentry *parent) -{ - struct dentry *dentry; - int error; - - pr_debug("creating file '%s'\n", name); - - if (IS_ERR(parent)) - return parent; - - error = simple_pin_fs(&debugfs, &debug_fs_type); - if (error) { - pr_err("Unable to pin filesystem for file '%s'\n", name); - return ERR_PTR(error); - } - - /* If the parent is not specified, we create it in the root. - * We need the root dentry to do this, which is in the super - * block. A pointer to that is in the struct vfsmount that we - * have around. - */ - if (!parent) - parent = debugfs.mount->mnt_root; - - inode_lock(d_inode(parent)); - if (unlikely(IS_DEADDIR(d_inode(parent)))) - dentry = ERR_PTR(-ENOENT); - else - dentry = lookup_one_len(name, parent, strlen(name)); - if (!IS_ERR(dentry) && d_really_is_positive(dentry)) { - if (d_is_dir(dentry)) - pr_err("Directory '%s' with parent '%s' already present!\n", - name, parent->d_name.name); - else - pr_err("File '%s' in directory '%s' already present!\n", - name, parent->d_name.name); - dput(dentry); - dentry = ERR_PTR(-EEXIST); - } - - if (IS_ERR(dentry)) { - inode_unlock(d_inode(parent)); - simple_release_fs(&debugfs); - } - - return dentry; -} - -static struct dentry *failed_creating(struct dentry *dentry) -{ - inode_unlock(d_inode(dentry->d_parent)); - dput(dentry); - simple_release_fs(&debugfs); - return ERR_PTR(-ENOMEM); -} - -static struct dentry *end_creating(struct dentry *dentry) -{ - inode_unlock(d_inode(dentry->d_parent)); - return dentry; -} - static struct dentry *__debugfs_create_file(const char *name, umode_t mode, struct dentry *parent, void *data, const struct file_operations *proxy_fops, @@ -364,32 +302,17 @@ static struct dentry *__debugfs_create_file(const char *name, umode_t mode, struct dentry *dentry; struct inode *inode; - if (!(mode & S_IFMT)) - mode |= S_IFREG; - BUG_ON(!S_ISREG(mode)); - dentry = start_creating(name, parent); - + dentry = simplefs_create_file(&debugfs, &debug_fs_type, + name, mode, parent, data, &inode); if (IS_ERR(dentry)) return dentry; - inode = simple_new_inode(dentry->d_sb); - if (unlikely(!inode)) { - pr_err("out of free dentries, can not create file '%s'\n", - name); - return failed_creating(dentry); - } - - inode->i_mode = mode; - inode->i_private = data; - inode->i_op = &debugfs_file_inode_operations; inode->i_fop = proxy_fops; dentry->d_fsdata = (void *)((unsigned long)real_fops | DEBUGFS_FSDATA_IS_REAL_FOPS_BIT); - d_instantiate(dentry, inode); - fsnotify_create(d_inode(dentry->d_parent), dentry); - return end_creating(dentry); + return simplefs_finish_dentry(dentry, inode); } /** @@ -522,29 +445,16 @@ EXPORT_SYMBOL_GPL(debugfs_create_file_size); */ struct dentry *debugfs_create_dir(const char *name, struct dentry *parent) { - struct dentry *dentry = start_creating(name, parent); + struct dentry *dentry; struct inode *inode; + dentry = simplefs_create_dir(&debugfs, &debug_fs_type, + name, 0755, parent, &inode); if (IS_ERR(dentry)) return dentry; - inode = simple_new_inode(dentry->d_sb); - if (unlikely(!inode)) { - pr_err("out of free dentries, can not create directory '%s'\n", - name); - return failed_creating(dentry); - } - - inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO; inode->i_op = &debugfs_dir_inode_operations; - inode->i_fop = &simple_dir_operations; - - /* directory inodes start off with i_nlink == 2 (for "." entry) */ - inc_nlink(inode); - d_instantiate(dentry, inode); - inc_nlink(d_inode(dentry->d_parent)); - fsnotify_mkdir(d_inode(dentry->d_parent), dentry); - return end_creating(dentry); + return simplefs_finish_dentry(dentry, inode); } EXPORT_SYMBOL_GPL(debugfs_create_dir); @@ -564,29 +474,19 @@ struct dentry *debugfs_create_automount(const char *name, debugfs_automount_t f, void *data) { - struct dentry *dentry = start_creating(name, parent); + struct dentry *dentry; struct inode *inode; + dentry = simplefs_create_dentry(&debugfs, &debug_fs_type, name, parent, + &inode); if (IS_ERR(dentry)) return dentry; - inode = simple_new_inode(dentry->d_sb); - if (unlikely(!inode)) { - pr_err("out of free dentries, can not create automount '%s'\n", - name); - return failed_creating(dentry); - } - make_empty_dir_inode(inode); inode->i_flags |= S_AUTOMOUNT; inode->i_private = data; dentry->d_fsdata = (void *)f; - /* directory inodes start off with i_nlink == 2 (for "." entry) */ - inc_nlink(inode); - d_instantiate(dentry, inode); - inc_nlink(d_inode(dentry->d_parent)); - fsnotify_mkdir(d_inode(dentry->d_parent), dentry); - return end_creating(dentry); + return simplefs_finish_dentry(dentry, inode); } EXPORT_SYMBOL(debugfs_create_automount); @@ -618,28 +518,14 @@ struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent, { struct dentry *dentry; struct inode *inode; - char *link = kstrdup(target, GFP_KERNEL); - if (!link) - return ERR_PTR(-ENOMEM); - dentry = start_creating(name, parent); - if (IS_ERR(dentry)) { - kfree(link); + dentry = simplefs_create_symlink(&debugfs, &debug_fs_type, + name, parent, target, &inode); + if (IS_ERR(dentry)) return dentry; - } - inode = simple_new_inode(dentry->d_sb); - if (unlikely(!inode)) { - pr_err("out of free dentries, can not create symlink '%s'\n", - name); - kfree(link); - return failed_creating(dentry); - } - inode->i_mode = S_IFLNK | S_IRWXUGO; inode->i_op = &debugfs_symlink_inode_operations; - inode->i_link = link; - d_instantiate(dentry, inode); - return end_creating(dentry); + return simplefs_finish_dentry(dentry, inode); } EXPORT_SYMBOL_GPL(debugfs_create_symlink);