/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * dir.c - Operations for configfs directories. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. * * Based on sysfs: * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel * * configfs Copyright (C) 2005 Oracle. All rights reserved. */ #undef DEBUG #include <linux/fs.h> #include <linux/mount.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/configfs.h> #include "configfs_internal.h" DECLARE_RWSEM(configfs_rename_sem); static void configfs_d_iput(struct dentry * dentry, struct inode * inode) { struct configfs_dirent * sd = dentry->d_fsdata; if (sd) { BUG_ON(sd->s_dentry != dentry); sd->s_dentry = NULL; configfs_put(sd); } iput(inode); } /* * We _must_ delete our dentries on last dput, as the chain-to-parent * behavior is required to clear the parents of default_groups. */ static int configfs_d_delete(struct dentry *dentry) { return 1; } static struct dentry_operations configfs_dentry_ops = { .d_iput = configfs_d_iput, /* simple_delete_dentry() isn't exported */ .d_delete = configfs_d_delete, }; /* * Allocates a new configfs_dirent and links it to the parent configfs_dirent */ static struct configfs_dirent *configfs_new_dirent(struct configfs_dirent * parent_sd, void * element) { struct configfs_dirent * sd; sd = kmem_cache_alloc(configfs_dir_cachep, GFP_KERNEL); if (!sd) return NULL; memset(sd, 0, sizeof(*sd)); atomic_set(&sd->s_count, 1); INIT_LIST_HEAD(&sd->s_links); INIT_LIST_HEAD(&sd->s_children); list_add(&sd->s_sibling, &parent_sd->s_children); sd->s_element = element; return sd; } /* * * Return -EEXIST if there is already a configfs element with the same * name for the same parent. * * called with parent inode's i_mutex held */ static int configfs_dirent_exists(struct configfs_dirent *parent_sd, const unsigned char *new) { struct configfs_dirent * sd; list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { if (sd->s_element) { const unsigned char *existing = configfs_get_name(sd); if (strcmp(existing, new)) continue; else return -EEXIST; } } return 0; } int configfs_make_dirent(struct configfs_dirent * parent_sd, struct dentry * dentry, void * element, umode_t mode, int type) { struct configfs_dirent * sd; sd = configfs_new_dirent(parent_sd, element); if (!sd) return -ENOMEM; sd->s_mode = mode; sd->s_type = type; sd->s_dentry = dentry; if (dentry) { dentry->d_fsdata = configfs_get(sd); dentry->d_op = &configfs_dentry_ops; } return 0; } static int init_dir(struct inode * inode) { inode->i_op = &configfs_dir_inode_operations; inode->i_fop = &configfs_dir_operations; /* directory inodes start off with i_nlink == 2 (for "." entry) */ inc_nlink(inode); return 0; } static int init_file(struct inode * inode) { inode->i_size = PAGE_SIZE; inode->i_fop = &configfs_file_operations; return 0; } static int init_symlink(struct inode * inode) { inode->i_op = &configfs_symlink_inode_operations; return 0; } static int create_dir(struct config_item * k, struct dentry * p, struct dentry * d) { int error; umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO; error = configfs_dirent_exists(p->d_fsdata, d->d_name.name); if (!error) error = configfs_make_dirent(p->d_fsdata, d, k, mode, CONFIGFS_DIR); if (!error) { error = configfs_create(d, mode, init_dir); if (!error) { inc_nlink(p->d_inode); (d)->d_op = &configfs_dentry_ops; } else { struct configfs_dirent *sd = d->d_fsdata; if (sd) { list_del_init(&sd->s_sibling); configfs_put(sd); } } } return error; } /** * configfs_create_dir - create a directory for an config_item. * @item: config_itemwe're creating directory for. * @dentry: config_item's dentry. */ static int configfs_create_dir(struct config_item * item, struct dentry *dentry) { struct dentry * parent; int error = 0; BUG_ON(!item); if (item->ci_parent) parent = item->ci_parent->ci_dentry; else if (configfs_mount && configfs_mount->mnt_sb) parent = configfs_mount->mnt_sb->s_root; else return -EFAULT; error = create_dir(item,parent,dentry); if (!error) item->ci_dentry = dentry; return error; } int configfs_create_link(struct configfs_symlink *sl, struct dentry *parent, struct dentry *dentry) { int err = 0; umode_t mode = S_IFLNK | S_IRWXUGO; err = configfs_make_dirent(parent->d_fsdata, dentry, sl, mode, CONFIGFS_ITEM_LINK); if (!err) { err = configfs_create(dentry, mode, init_symlink); if (!err) dentry->d_op = &configfs_dentry_ops; else { struct configfs_dirent *sd = dentry->d_fsdata; if (sd) { list_del_init(&sd->s_sibling); configfs_put(sd); } } } return err; } static void remove_dir(struct dentry * d) { struct dentry * parent = dget(d->d_parent); struct configfs_dirent * sd; sd = d->d_fsdata; list_del_init(&sd->s_sibling); configfs_put(sd); if (d->d_inode) simple_rmdir(parent->d_inode,d); pr_debug(" o %s removing done (%d)\n",d->d_name.name, atomic_read(&d->d_count)); dput(parent); } /** * configfs_remove_dir - remove an config_item's directory. * @item: config_item we're removing. * * The only thing special about this is that we remove any files in * the directory before we remove the directory, and we've inlined * what used to be configfs_rmdir() below, instead of calling separately. */ static void configfs_remove_dir(struct config_item * item) { struct dentry * dentry = dget(item->ci_dentry); if (!dentry) return; remove_dir(dentry); /** * Drop reference from dget() on entrance. */ dput(dentry); } /* attaches attribute's configfs_dirent to the dentry corresponding to the * attribute file */ static int configfs_attach_attr(struct configfs_dirent * sd, struct dentry * dentry) { struct configfs_attribute * attr = sd->s_element; int error; dentry->d_fsdata = configfs_get(sd); sd->s_dentry = dentry; error = configfs_create(dentry, (attr->ca_mode & S_IALLUGO) | S_IFREG, init_file); if (error) { configfs_put(sd); return error; } dentry->d_op = &configfs_dentry_ops; d_rehash(dentry); return 0; } static struct dentry * configfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { struct configfs_dirent * parent_sd = dentry->d_parent->d_fsdata; struct configfs_dirent * sd; int found = 0; int err = 0; list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { if (sd->s_type & CONFIGFS_NOT_PINNED) { const unsigned char * name = configfs_get_name(sd); if (strcmp(name, dentry->d_name.name)) continue; found = 1; err = configfs_attach_attr(sd, dentry); break; } } if (!found) { /* * If it doesn't exist and it isn't a NOT_PINNED item, * it must be negative. */ return simple_lookup(dir, dentry, nd); } return ERR_PTR(err); } /* * Only subdirectories count here. Files (CONFIGFS_NOT_PINNED) are * attributes and are removed by rmdir(). We recurse, taking i_mutex * on all children that are candidates for default detach. If the * result is clean, then configfs_detach_group() will handle dropping * i_mutex. If there is an error, the caller will clean up the i_mutex * holders via configfs_detach_rollback(). */ static int configfs_detach_prep(struct dentry *dentry) { struct configfs_dirent *parent_sd = dentry->d_fsdata; struct configfs_dirent *sd; int ret; ret = -EBUSY; if (!list_empty(&parent_sd->s_links)) goto out; ret = 0; list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { if (sd->s_type & CONFIGFS_NOT_PINNED) continue; if (sd->s_type & CONFIGFS_USET_DEFAULT) { mutex_lock(&sd->s_dentry->d_inode->i_mutex); /* Mark that we've taken i_mutex */ sd->s_type |= CONFIGFS_USET_DROPPING; ret = configfs_detach_prep(sd->s_dentry); if (!ret) continue; } else ret = -ENOTEMPTY; break; } out: return ret; } /* * Walk the tree, dropping i_mutex wherever CONFIGFS_USET_DROPPING is * set. */ static void configfs_detach_rollback(struct dentry *dentry) { struct configfs_dirent *parent_sd = dentry->d_fsdata; struct configfs_dirent *sd; list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { if (sd->s_type & CONFIGFS_USET_DEFAULT) { configfs_detach_rollback(sd->s_dentry); if (sd->s_type & CONFIGFS_USET_DROPPING) { sd->s_type &= ~CONFIGFS_USET_DROPPING; mutex_unlock(&sd->s_dentry->d_inode->i_mutex); } } } } static void detach_attrs(struct config_item * item) { struct dentry * dentry = dget(item->ci_dentry); struct configfs_dirent * parent_sd; struct configfs_dirent * sd, * tmp; if (!dentry) return; pr_debug("configfs %s: dropping attrs for dir\n", dentry->d_name.name); parent_sd = dentry->d_fsdata; list_for_each_entry_safe(sd, tmp, &parent_sd->s_children, s_sibling) { if (!sd->s_element || !(sd->s_type & CONFIGFS_NOT_PINNED)) continue; list_del_init(&sd->s_sibling); configfs_drop_dentry(sd, dentry); configfs_put(sd); } /** * Drop reference from dget() on entrance. */ dput(dentry); } static int populate_attrs(struct config_item *item) { struct config_item_type *t = item->ci_type; struct configfs_attribute *attr; int error = 0; int i; if (!t) return -EINVAL; if (t->ct_attrs) { for (i = 0; (attr = t->ct_attrs[i]) != NULL; i++) { if ((error = configfs_create_file(item, attr))) break; } } if (error) detach_attrs(item); return error; } static int configfs_attach_group(struct config_item *parent_item, struct config_item *item, struct dentry *dentry); static void configfs_detach_group(struct config_item *item); static void detach_groups(struct config_group *group) { struct dentry * dentry = dget(group->cg_item.ci_dentry); struct dentry *child; struct configfs_dirent *parent_sd; struct configfs_dirent *sd, *tmp; if (!dentry) return; parent_sd = dentry->d_fsdata; list_for_each_entry_safe(sd, tmp, &parent_sd->s_children, s_sibling) { if (!sd->s_element || !(sd->s_type & CONFIGFS_USET_DEFAULT)) continue; child = sd->s_dentry; configfs_detach_group(sd->s_element); child->d_inode->i_flags |= S_DEAD; /* * From rmdir/unregister, a configfs_detach_prep() pass * has taken our i_mutex for us. Drop it. * From mkdir/register cleanup, there is no sem held. */ if (sd->s_type & CONFIGFS_USET_DROPPING) mutex_unlock(&child->d_inode->i_mutex); d_delete(child); dput(child); } /** * Drop reference from dget() on entrance. */ dput(dentry); } /* * This fakes mkdir(2) on a default_groups[] entry. It * creates a dentry, attachs it, and then does fixup * on the sd->s_type. * * We could, perhaps, tweak our parent's ->mkdir for a minute and * try using vfs_mkdir. Just a thought. */ static int create_default_group(struct config_group *parent_group, struct config_group *group) { int ret; struct qstr name; struct configfs_dirent *sd; /* We trust the caller holds a reference to parent */ struct dentry *child, *parent = parent_group->cg_item.ci_dentry; if (!group->cg_item.ci_name) group->cg_item.ci_name = group->cg_item.ci_namebuf; name.name = group->cg_item.ci_name; name.len = strlen(name.name); name.hash = full_name_hash(name.name, name.len); ret = -ENOMEM; child = d_alloc(parent, &name); if (child) { d_add(child, NULL); ret = configfs_attach_group(&parent_group->cg_item, &group->cg_item, child); if (!ret) { sd = child->d_fsdata; sd->s_type |= CONFIGFS_USET_DEFAULT; } else { d_delete(child); dput(child); } } return ret; } static int populate_groups(struct config_group *group) { struct config_group *new_group; struct dentry *dentry = group->cg_item.ci_dentry; int ret = 0; int i; if (group->default_groups) { /* * FYI, we're faking mkdir here * I'm not sure we need this semaphore, as we're called * from our parent's mkdir. That holds our parent's * i_mutex, so afaik lookup cannot continue through our * parent to find us, let alone mess with our tree. * That said, taking our i_mutex is closer to mkdir * emulation, and shouldn't hurt. */ mutex_lock(&dentry->d_inode->i_mutex); for (i = 0; group->default_groups[i]; i++) { new_group = group->default_groups[i]; ret = create_default_group(group, new_group); if (ret) break; } mutex_unlock(&dentry->d_inode->i_mutex); } if (ret) detach_groups(group); return ret; } /* * All of link_obj/unlink_obj/link_group/unlink_group require that * subsys->su_sem is held. */ static void unlink_obj(struct config_item *item) { struct config_group *group; group = item->ci_group; if (group) { list_del_init(&item->ci_entry); item->ci_group = NULL; item->ci_parent = NULL; /* Drop the reference for ci_entry */ config_item_put(item); /* Drop the reference for ci_parent */ config_group_put(group); } } static void link_obj(struct config_item *parent_item, struct config_item *item) { /* * Parent seems redundant with group, but it makes certain * traversals much nicer. */ item->ci_parent = parent_item; /* * We hold a reference on the parent for the child's ci_parent * link. */ item->ci_group = config_group_get(to_config_group(parent_item)); list_add_tail(&item->ci_entry, &item->ci_group->cg_children); /* * We hold a reference on the child for ci_entry on the parent's * cg_children */ config_item_get(item); } static void unlink_group(struct config_group *group) { int i; struct config_group *new_group; if (group->default_groups) { for (i = 0; group->default_groups[i]; i++) { new_group = group->default_groups[i]; unlink_group(new_group); } } group->cg_subsys = NULL; unlink_obj(&group->cg_item); } static void link_group(struct config_group *parent_group, struct config_group *group) { int i; struct config_group *new_group; struct configfs_subsystem *subsys = NULL; /* gcc is a turd */ link_obj(&parent_group->cg_item, &group->cg_item); if (parent_group->cg_subsys) subsys = parent_group->cg_subsys; else if (configfs_is_root(&parent_group->cg_item)) subsys = to_configfs_subsystem(group); else BUG(); group->cg_subsys = subsys; if (group->default_groups) { for (i = 0; group->default_groups[i]; i++) { new_group = group->default_groups[i]; link_group(group, new_group); } } } /* * The goal is that configfs_attach_item() (and * configfs_attach_group()) can be called from either the VFS or this * module. That is, they assume that the items have been created, * the dentry allocated, and the dcache is all ready to go. * * If they fail, they must clean up after themselves as if they * had never been called. The caller (VFS or local function) will * handle cleaning up the dcache bits. * * configfs_detach_group() and configfs_detach_item() behave similarly on * the way out. They assume that the proper semaphores are held, they * clean up the configfs items, and they expect their callers will * handle the dcache bits. */ static int configfs_attach_item(struct config_item *parent_item, struct config_item *item, struct dentry *dentry) { int ret; ret = configfs_create_dir(item, dentry); if (!ret) { ret = populate_attrs(item); if (ret) { configfs_remove_dir(item); d_delete(dentry); } } return ret; } static void configfs_detach_item(struct config_item *item) { detach_attrs(item); configfs_remove_dir(item); } static int configfs_attach_group(struct config_item *parent_item, struct config_item *item, struct dentry *dentry) { int ret; struct configfs_dirent *sd; ret = configfs_attach_item(parent_item, item, dentry); if (!ret) { sd = dentry->d_fsdata; sd->s_type |= CONFIGFS_USET_DIR; ret = populate_groups(to_config_group(item)); if (ret) { configfs_detach_item(item); d_delete(dentry); } } return ret; } static void configfs_detach_group(struct config_item *item) { detach_groups(to_config_group(item)); configfs_detach_item(item); } /* * Drop the initial reference from make_item()/make_group() * This function assumes that reference is held on item * and that item holds a valid reference to the parent. Also, it * assumes the caller has validated ci_type. */ static void client_drop_item(struct config_item *parent_item, struct config_item *item) { struct config_item_type *type; type = parent_item->ci_type; BUG_ON(!type); /* * If ->drop_item() exists, it is responsible for the * config_item_put(). */ if (type->ct_group_ops && type->ct_group_ops->drop_item) type->ct_group_ops->drop_item(to_config_group(parent_item), item); else config_item_put(item); } static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) { int ret, module_got = 0; struct config_group *group; struct config_item *item; struct config_item *parent_item; struct configfs_subsystem *subsys; struct configfs_dirent *sd; struct config_item_type *type; struct module *owner = NULL; char *name; if (dentry->d_parent == configfs_sb->s_root) { ret = -EPERM; goto out; } sd = dentry->d_parent->d_fsdata; if (!(sd->s_type & CONFIGFS_USET_DIR)) { ret = -EPERM; goto out; } /* Get a working ref for the duration of this function */ parent_item = configfs_get_config_item(dentry->d_parent); type = parent_item->ci_type; subsys = to_config_group(parent_item)->cg_subsys; BUG_ON(!subsys); if (!type || !type->ct_group_ops || (!type->ct_group_ops->make_group && !type->ct_group_ops->make_item)) { ret = -EPERM; /* Lack-of-mkdir returns -EPERM */ goto out_put; } name = kmalloc(dentry->d_name.len + 1, GFP_KERNEL); if (!name) { ret = -ENOMEM; goto out_put; } snprintf(name, dentry->d_name.len + 1, "%s", dentry->d_name.name); down(&subsys->su_sem); group = NULL; item = NULL; if (type->ct_group_ops->make_group) { group = type->ct_group_ops->make_group(to_config_group(parent_item), name); if (group) { link_group(to_config_group(parent_item), group); item = &group->cg_item; } } else { item = type->ct_group_ops->make_item(to_config_group(parent_item), name); if (item) link_obj(parent_item, item); } up(&subsys->su_sem); kfree(name); if (!item) { /* * If item == NULL, then link_obj() was never called. * There are no extra references to clean up. */ ret = -ENOMEM; goto out_put; } /* * link_obj() has been called (via link_group() for groups). * From here on out, errors must clean that up. */ type = item->ci_type; if (!type) { ret = -EINVAL; goto out_unlink; } owner = type->ct_owner; if (!try_module_get(owner)) { ret = -EINVAL; goto out_unlink; } /* * I hate doing it this way, but if there is * an error, module_put() probably should * happen after any cleanup. */ module_got = 1; if (group) ret = configfs_attach_group(parent_item, item, dentry); else ret = configfs_attach_item(parent_item, item, dentry); out_unlink: if (ret) { /* Tear down everything we built up */ down(&subsys->su_sem); if (group) unlink_group(group); else unlink_obj(item); client_drop_item(parent_item, item); up(&subsys->su_sem); if (module_got) module_put(owner); } out_put: /* * link_obj()/link_group() took a reference from child->parent, * so the parent is safely pinned. We can drop our working * reference. */ config_item_put(parent_item); out: return ret; } static int configfs_rmdir(struct inode *dir, struct dentry *dentry) { struct config_item *parent_item; struct config_item *item; struct configfs_subsystem *subsys; struct configfs_dirent *sd; struct module *owner = NULL; int ret; if (dentry->d_parent == configfs_sb->s_root) return -EPERM; sd = dentry->d_fsdata; if (sd->s_type & CONFIGFS_USET_DEFAULT) return -EPERM; /* Get a working ref until we have the child */ parent_item = configfs_get_config_item(dentry->d_parent); subsys = to_config_group(parent_item)->cg_subsys; BUG_ON(!subsys); if (!parent_item->ci_type) { config_item_put(parent_item); return -EINVAL; } ret = configfs_detach_prep(dentry); if (ret) { configfs_detach_rollback(dentry); config_item_put(parent_item); return ret; } /* Get a working ref for the duration of this function */ item = configfs_get_config_item(dentry); /* Drop reference from above, item already holds one. */ config_item_put(parent_item); if (item->ci_type) owner = item->ci_type->ct_owner; if (sd->s_type & CONFIGFS_USET_DIR) { configfs_detach_group(item); down(&subsys->su_sem); unlink_group(to_config_group(item)); } else { configfs_detach_item(item); down(&subsys->su_sem); unlink_obj(item); } client_drop_item(parent_item, item); up(&subsys->su_sem); /* Drop our reference from above */ config_item_put(item); module_put(owner); return 0; } struct inode_operations configfs_dir_inode_operations = { .mkdir = configfs_mkdir, .rmdir = configfs_rmdir, .symlink = configfs_symlink, .unlink = configfs_unlink, .lookup = configfs_lookup, .setattr = configfs_setattr, }; #if 0 int configfs_rename_dir(struct config_item * item, const char *new_name) { int error = 0; struct dentry * new_dentry, * parent; if (!strcmp(config_item_name(item), new_name)) return -EINVAL; if (!item->parent) return -EINVAL; down_write(&configfs_rename_sem); parent = item->parent->dentry; mutex_lock(&parent->d_inode->i_mutex); new_dentry = lookup_one_len(new_name, parent, strlen(new_name)); if (!IS_ERR(new_dentry)) { if (!new_dentry->d_inode) { error = config_item_set_name(item, "%s", new_name); if (!error) { d_add(new_dentry, NULL); d_move(item->dentry, new_dentry); } else d_delete(new_dentry); } else error = -EEXIST; dput(new_dentry); } mutex_unlock(&parent->d_inode->i_mutex); up_write(&configfs_rename_sem); return error; } #endif static int configfs_dir_open(struct inode *inode, struct file *file) { struct dentry * dentry = file->f_path.dentry; struct configfs_dirent * parent_sd = dentry->d_fsdata; mutex_lock(&dentry->d_inode->i_mutex); file->private_data = configfs_new_dirent(parent_sd, NULL); mutex_unlock(&dentry->d_inode->i_mutex); return file->private_data ? 0 : -ENOMEM; } static int configfs_dir_close(struct inode *inode, struct file *file) { struct dentry * dentry = file->f_path.dentry; struct configfs_dirent * cursor = file->private_data; mutex_lock(&dentry->d_inode->i_mutex); list_del_init(&cursor->s_sibling); mutex_unlock(&dentry->d_inode->i_mutex); release_configfs_dirent(cursor); return 0; } /* Relationship between s_mode and the DT_xxx types */ static inline unsigned char dt_type(struct configfs_dirent *sd) { return (sd->s_mode >> 12) & 15; } static int configfs_readdir(struct file * filp, void * dirent, filldir_t filldir) { struct dentry *dentry = filp->f_path.dentry; struct configfs_dirent * parent_sd = dentry->d_fsdata; struct configfs_dirent *cursor = filp->private_data; struct list_head *p, *q = &cursor->s_sibling; ino_t ino; int i = filp->f_pos; switch (i) { case 0: ino = dentry->d_inode->i_ino; if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) break; filp->f_pos++; i++; /* fallthrough */ case 1: ino = parent_ino(dentry); if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) break; filp->f_pos++; i++; /* fallthrough */ default: if (filp->f_pos == 2) { list_move(q, &parent_sd->s_children); } for (p=q->next; p!= &parent_sd->s_children; p=p->next) { struct configfs_dirent *next; const char * name; int len; next = list_entry(p, struct configfs_dirent, s_sibling); if (!next->s_element) continue; name = configfs_get_name(next); len = strlen(name); if (next->s_dentry) ino = next->s_dentry->d_inode->i_ino; else ino = iunique(configfs_sb, 2); if (filldir(dirent, name, len, filp->f_pos, ino, dt_type(next)) < 0) return 0; list_move(q, p); p = q; filp->f_pos++; } } return 0; } static loff_t configfs_dir_lseek(struct file * file, loff_t offset, int origin) { struct dentry * dentry = file->f_path.dentry; mutex_lock(&dentry->d_inode->i_mutex); switch (origin) { case 1: offset += file->f_pos; case 0: if (offset >= 0) break; default: mutex_unlock(&file->f_path.dentry->d_inode->i_mutex); return -EINVAL; } if (offset != file->f_pos) { file->f_pos = offset; if (file->f_pos >= 2) { struct configfs_dirent *sd = dentry->d_fsdata; struct configfs_dirent *cursor = file->private_data; struct list_head *p; loff_t n = file->f_pos - 2; list_del(&cursor->s_sibling); p = sd->s_children.next; while (n && p != &sd->s_children) { struct configfs_dirent *next; next = list_entry(p, struct configfs_dirent, s_sibling); if (next->s_element) n--; p = p->next; } list_add_tail(&cursor->s_sibling, p); } } mutex_unlock(&dentry->d_inode->i_mutex); return offset; } const struct file_operations configfs_dir_operations = { .open = configfs_dir_open, .release = configfs_dir_close, .llseek = configfs_dir_lseek, .read = generic_read_dir, .readdir = configfs_readdir, }; int configfs_register_subsystem(struct configfs_subsystem *subsys) { int err; struct config_group *group = &subsys->su_group; struct qstr name; struct dentry *dentry; struct configfs_dirent *sd; err = configfs_pin_fs(); if (err) return err; if (!group->cg_item.ci_name) group->cg_item.ci_name = group->cg_item.ci_namebuf; sd = configfs_sb->s_root->d_fsdata; link_group(to_config_group(sd->s_element), group); mutex_lock(&configfs_sb->s_root->d_inode->i_mutex); name.name = group->cg_item.ci_name; name.len = strlen(name.name); name.hash = full_name_hash(name.name, name.len); err = -ENOMEM; dentry = d_alloc(configfs_sb->s_root, &name); if (!dentry) goto out_release; d_add(dentry, NULL); err = configfs_attach_group(sd->s_element, &group->cg_item, dentry); if (!err) dentry = NULL; else d_delete(dentry); mutex_unlock(&configfs_sb->s_root->d_inode->i_mutex); if (dentry) { dput(dentry); out_release: unlink_group(group); configfs_release_fs(); } return err; } void configfs_unregister_subsystem(struct configfs_subsystem *subsys) { struct config_group *group = &subsys->su_group; struct dentry *dentry = group->cg_item.ci_dentry; if (dentry->d_parent != configfs_sb->s_root) { printk(KERN_ERR "configfs: Tried to unregister non-subsystem!\n"); return; } mutex_lock_nested(&configfs_sb->s_root->d_inode->i_mutex, I_MUTEX_PARENT); mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); if (configfs_detach_prep(dentry)) { printk(KERN_ERR "configfs: Tried to unregister non-empty subsystem!\n"); } configfs_detach_group(&group->cg_item); dentry->d_inode->i_flags |= S_DEAD; mutex_unlock(&dentry->d_inode->i_mutex); d_delete(dentry); mutex_unlock(&configfs_sb->s_root->d_inode->i_mutex); dput(dentry); unlink_group(group); configfs_release_fs(); } EXPORT_SYMBOL(configfs_register_subsystem); EXPORT_SYMBOL(configfs_unregister_subsystem);