/** * relayfs_create_entry - create a relayfs directory or file * @name: the name of the file to create * @parent: parent directory * @mode: mode * @chan: relay channel associated with the file * * Returns the new dentry, NULL on failure * * Creates a file or directory with the specifed permissions. */ static struct dentry *relayfs_create_entry(const char *name, struct dentry *parent, int mode, struct rchan *chan) { struct dentry *d; struct inode *inode; int error = 0; BUG_ON(!name || !(S_ISREG(mode) || S_ISDIR(mode))); error = simple_pin_fs("relayfs", &relayfs_mount, &relayfs_mount_count); if (error) { printk(KERN_ERR "Couldn't mount relayfs: errcode %d\n", error); return NULL; } if (!parent && relayfs_mount && relayfs_mount->mnt_sb) parent = relayfs_mount->mnt_sb->s_root; if (!parent) { simple_release_fs(&relayfs_mount, &relayfs_mount_count); return NULL; } parent = dget(parent); down(&parent->d_inode->i_sem); d = lookup_one_len(name, parent, strlen(name)); if (IS_ERR(d)) { d = NULL; goto release_mount; } if (d->d_inode) { d = NULL; goto release_mount; } inode = relayfs_get_inode(parent->d_inode->i_sb, mode, chan); if (!inode) { d = NULL; goto release_mount; } d_instantiate(d, inode); dget(d); /* Extra count - pin the dentry in core */ if (S_ISDIR(mode)) parent->d_inode->i_nlink++; goto exit; release_mount: simple_release_fs(&relayfs_mount, &relayfs_mount_count); exit: up(&parent->d_inode->i_sem); dput(parent); return d; }
/** * debugfs_create_file - create a file in the debugfs filesystem * @name: a pointer to a string containing the name of the file to create. * @mode: the permission that the file should have * @parent: a pointer to the parent dentry for this file. This should be a * directory dentry if set. If this paramater is NULL, then the * file will be created in the root of the debugfs filesystem. * @data: a pointer to something that the caller will want to get to later * on. The inode.i_private pointer will point to this value on * the open() call. * @fops: a pointer to a struct file_operations that should be used for * this file. * * This is the basic "create a file" function for debugfs. It allows for a * wide range of flexibility in createing a file, or a directory (if you * want to create a directory, the debugfs_create_dir() function is * recommended to be used instead.) * * This function will return a pointer to a dentry if it succeeds. This * pointer must be passed to the debugfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, * you are responsible here.) If an error occurs, %NULL will be returned. * * If debugfs is not enabled in the kernel, the value -%ENODEV will be * returned. */ struct dentry *debugfs_create_file(const char *name, mode_t mode, struct dentry *parent, void *data, const struct file_operations *fops) { struct dentry *dentry = NULL; int error; pr_debug("debugfs: creating file '%s'\n",name); error = simple_pin_fs(&debug_fs_type, &debugfs_mount, &debugfs_mount_count); if (error) goto exit; error = debugfs_create_by_name(name, mode, parent, &dentry); if (error) { dentry = NULL; simple_release_fs(&debugfs_mount, &debugfs_mount_count); goto exit; } if (dentry->d_inode) { if (data) dentry->d_inode->i_private = data; if (fops) dentry->d_inode->i_fop = fops; } exit: return dentry; }
/** * securityfs_create_file - create a file in the securityfs filesystem * * @name: a pointer to a string containing the name of the file to create. * @mode: the permission that the file should have * @parent: a pointer to the parent dentry for this file. This should be a * directory dentry if set. If this paramater is NULL, then the * file will be created in the root of the securityfs filesystem. * @data: a pointer to something that the caller will want to get to later * on. The inode.u.generic_ip pointer will point to this value on * the open() call. * @fops: a pointer to a struct file_operations that should be used for * this file. * * This is the basic "create a file" function for securityfs. It allows for a * wide range of flexibility in createing a file, or a directory (if you * want to create a directory, the securityfs_create_dir() function is * recommended to be used instead.) * * This function will return a pointer to a dentry if it succeeds. This * pointer must be passed to the securityfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, * you are responsible here.) If an error occurs, NULL will be returned. * * If securityfs is not enabled in the kernel, the value -ENODEV will be * returned. It is not wise to check for this value, but rather, check for * NULL or !NULL instead as to eliminate the need for #ifdef in the calling * code. */ struct dentry *securityfs_create_file(const char *name, mode_t mode, struct dentry *parent, void *data, struct file_operations *fops) { struct dentry *dentry = NULL; int error; pr_debug("securityfs: creating file '%s'\n",name); error = simple_pin_fs("securityfs", &mount, &mount_count); if (error) { dentry = ERR_PTR(error); goto exit; } error = create_by_name(name, mode, parent, &dentry); if (error) { dentry = ERR_PTR(error); simple_release_fs(&mount, &mount_count); goto exit; } if (dentry->d_inode) { if (fops) dentry->d_inode->i_fop = fops; if (data) dentry->d_inode->u.generic_ip = data; } exit: return dentry; }
struct dentry *__create_file(const char *name, umode_t mode, struct dentry *parent, void *data, const struct file_operations *fops) { struct dentry *dentry = NULL; int error; pr_debug("debugfs: creating file '%s'\n",name); error = simple_pin_fs(&debug_fs_type, &debugfs_mount, &debugfs_mount_count); if (error) goto exit; /* 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; dentry = NULL; mutex_lock(&parent->d_inode->i_mutex); dentry = lookup_one_len(name, parent, strlen(name)); if (!IS_ERR(dentry)) { switch (mode & S_IFMT) { case S_IFDIR: error = debugfs_mkdir(parent->d_inode, dentry, mode); break; case S_IFLNK: error = debugfs_link(parent->d_inode, dentry, mode, data); break; default: error = debugfs_create(parent->d_inode, dentry, mode, data, fops); break; } dput(dentry); } else error = PTR_ERR(dentry); mutex_unlock(&parent->d_inode->i_mutex); if (error) { dentry = NULL; simple_release_fs(&debugfs_mount, &debugfs_mount_count); } exit: return dentry; }
struct dentry *capifs_new_ncci(unsigned int number, dev_t device) { struct dentry *dentry; if (simple_pin_fs(&capifs_fs_type, &capifs_mnt, &capifs_mnt_count) < 0) return NULL; dentry = new_ncci(number, device); if (!dentry) simple_release_fs(&capifs_mnt, &capifs_mnt_count); return dentry; }
static struct inode *drm_fs_inode_new(void) { struct inode *inode; int r; r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); if (r < 0) { DRM_ERROR("Cannot mount pseudo fs: %d\n", r); return ERR_PTR(r); } inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); if (IS_ERR(inode)) simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); return inode; }
static struct file *cxl_getfile(const char *name, const struct file_operations *fops, void *priv, int flags) { struct file *file; struct inode *inode; int rc; /* strongly inspired by anon_inode_getfile() */ if (fops->owner && !try_module_get(fops->owner)) return ERR_PTR(-ENOENT); rc = simple_pin_fs(&cxl_fs_type, &cxl_vfs_mount, &cxl_fs_cnt); if (rc < 0) { pr_err("Cannot mount cxl pseudo filesystem: %d\n", rc); file = ERR_PTR(rc); goto err_module; } inode = alloc_anon_inode(cxl_vfs_mount->mnt_sb); if (IS_ERR(inode)) { file = ERR_CAST(inode); goto err_fs; } file = alloc_file_pseudo(inode, cxl_vfs_mount, name, flags & (O_ACCMODE | O_NONBLOCK), fops); if (IS_ERR(file)) goto err_inode; file->private_data = priv; return file; err_inode: iput(inode); err_fs: simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt); err_module: module_put(fops->owner); return file; }
/** * securityfs_create_file - create a file in the securityfs filesystem * * @name: a pointer to a string containing the name of the file to create. * @mode: the permission that the file should have * @parent: a pointer to the parent dentry for this file. This should be a * directory dentry if set. If this parameter is %NULL, then the * file will be created in the root of the securityfs filesystem. * @data: a pointer to something that the caller will want to get to later * on. The inode.i_private pointer will point to this value on * the open() call. * @fops: a pointer to a struct file_operations that should be used for * this file. * * This is the basic "create a file" function for securityfs. It allows for a * wide range of flexibility in creating a file, or a directory (if you * want to create a directory, the securityfs_create_dir() function is * recommended to be used instead). * * This function returns a pointer to a dentry if it succeeds. This * pointer must be passed to the securityfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, * you are responsible here). If an error occurs, the function will return * the erorr value (via ERR_PTR). * * If securityfs is not enabled in the kernel, the value %-ENODEV is * returned. */ struct dentry *securityfs_create_file(const char *name, umode_t mode, struct dentry *parent, void *data, const struct file_operations *fops) { struct dentry *dentry; int is_dir = S_ISDIR(mode); struct inode *dir, *inode; int error; if (!is_dir) { BUG_ON(!fops); mode = (mode & S_IALLUGO) | S_IFREG; } pr_debug("securityfs: creating file '%s'\n",name); error = simple_pin_fs(&fs_type, &mount, &mount_count); if (error) return ERR_PTR(error); if (!parent) parent = mount->mnt_root; dir = parent->d_inode; mutex_lock(&dir->i_mutex); dentry = lookup_one_len(name, parent, strlen(name)); if (IS_ERR(dentry)) goto out; if (dentry->d_inode) { error = -EEXIST; goto out1; } inode = new_inode(dir->i_sb); if (!inode) { error = -ENOMEM; goto out1; } inode->i_ino = get_next_ino(); inode->i_mode = mode; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; inode->i_private = data; if (is_dir) { inode->i_op = &simple_dir_inode_operations; inode->i_fop = &simple_dir_operations; inc_nlink(inode); inc_nlink(dir); } else { inode->i_fop = fops; } d_instantiate(dentry, inode); dget(dentry); mutex_unlock(&dir->i_mutex); return dentry; out1: dput(dentry); dentry = ERR_PTR(error); out: mutex_unlock(&dir->i_mutex); simple_release_fs(&mount, &mount_count); return dentry; }
int configfs_pin_fs(void) { return simple_pin_fs(&configfs_fs_type, &configfs_mount, &configfs_mnt_count); }
struct dentry *configfs_pin_fs(void) { int err = simple_pin_fs(&configfs_fs_type, &configfs_mount, &configfs_mnt_count); return err ? ERR_PTR(err) : configfs_mount->mnt_root; }