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Kumar" , "Matthew R. Ochs" , Uma Krishnan , "James E.J. Bottomley" , "Martin K. Petersen" , Alexander Viro , Joel Becker , Christoph Hellwig , "Rafael J. Wysocki" , John Johansen , James Morris , "Serge E. Hallyn" , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-scsi@vger.kernel.org, linux-security-module@vger.kernel.org, Paolo Bonzini , Emanuele Giuseppe Esposito Subject: [PATCH v2 7/7] tracefs: switch to simplefs inode creation API Date: Tue, 21 Apr 2020 15:57:41 +0200 Message-Id: <20200421135741.30657-5-eesposit@redhat.com> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200421135119.30007-1-eesposit@redhat.com> References: <20200421135119.30007-1-eesposit@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There is no semantic change intended; the code in the libfs.c functions in fact was derived from debugfs and tracefs code. Signed-off-by: Emanuele Giuseppe Esposito --- fs/tracefs/inode.c | 86 ++++------------------------------------------ 1 file changed, 7 insertions(+), 79 deletions(-) diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c index 370eb38ff1ad..bceaa4f45da2 100644 --- a/fs/tracefs/inode.c +++ b/fs/tracefs/inode.c @@ -308,57 +308,6 @@ static struct file_system_type trace_fs_type = { }; MODULE_ALIAS_FS("tracefs"); -static struct dentry *start_creating(const char *name, struct dentry *parent) -{ - struct dentry *dentry; - int error; - - pr_debug("tracefs: creating file '%s'\n",name); - - error = simple_pin_fs(&tracefs, &trace_fs_type); - if (error) - 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 = tracefs.mount->mnt_root; - - inode_lock(parent->d_inode); - if (unlikely(IS_DEADDIR(parent->d_inode))) - dentry = ERR_PTR(-ENOENT); - else - dentry = lookup_one_len(name, parent, strlen(name)); - if (!IS_ERR(dentry) && dentry->d_inode) { - dput(dentry); - dentry = ERR_PTR(-EEXIST); - } - - if (IS_ERR(dentry)) { - inode_unlock(parent->d_inode); - simple_release_fs(&tracefs); - } - - return dentry; -} - -static struct dentry *failed_creating(struct dentry *dentry) -{ - inode_unlock(dentry->d_parent->d_inode); - dput(dentry); - simple_release_fs(&tracefs); - return NULL; -} - -static struct dentry *end_creating(struct dentry *dentry) -{ - inode_unlock(dentry->d_parent->d_inode); - return dentry; -} - /** * tracefs_create_file - create a file in the tracefs filesystem * @name: a pointer to a string containing the name of the file to create. @@ -395,49 +344,28 @@ struct dentry *tracefs_create_file(const char *name, umode_t mode, if (security_locked_down(LOCKDOWN_TRACEFS)) return NULL; - if (!(mode & S_IFMT)) - mode |= S_IFREG; - BUG_ON(!S_ISREG(mode)); - dentry = start_creating(name, parent); - + dentry = simplefs_create_file(&tracefs, &trace_fs_type, + name, mode, parent, data, &inode); if (IS_ERR(dentry)) return NULL; - inode = tracefs_get_inode(dentry->d_sb); - if (unlikely(!inode)) - return failed_creating(dentry); - - inode->i_mode = mode; inode->i_fop = fops ? fops : &tracefs_file_operations; - inode->i_private = data; - d_instantiate(dentry, inode); - fsnotify_create(dentry->d_parent->d_inode, dentry); - return end_creating(dentry); + return simplefs_finish_dentry(dentry, inode); } static struct dentry *__create_dir(const char *name, struct dentry *parent, const struct inode_operations *ops) { - struct dentry *dentry = start_creating(name, parent); + struct dentry *dentry; struct inode *inode; + dentry = simplefs_create_dir(&tracefs, &trace_fs_type, + name, 0755, parent, &inode); if (IS_ERR(dentry)) return NULL; - inode = tracefs_get_inode(dentry->d_sb); - if (unlikely(!inode)) - return failed_creating(dentry); - - inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO; inode->i_op = ops; - 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(dentry->d_parent->d_inode); - fsnotify_mkdir(dentry->d_parent->d_inode, dentry); - return end_creating(dentry); + return simplefs_finish_dentry(dentry, inode); } /** -- 2.25.2