diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/configfs')
| -rw-r--r-- | ANDROID_3.4.5/fs/configfs/Kconfig | 11 | ||||
| -rw-r--r-- | ANDROID_3.4.5/fs/configfs/Makefile | 7 | ||||
| -rw-r--r-- | ANDROID_3.4.5/fs/configfs/configfs_internal.h | 160 | ||||
| -rw-r--r-- | ANDROID_3.4.5/fs/configfs/dir.c | 1756 | ||||
| -rw-r--r-- | ANDROID_3.4.5/fs/configfs/file.c | 344 | ||||
| -rw-r--r-- | ANDROID_3.4.5/fs/configfs/inode.c | 296 | ||||
| -rw-r--r-- | ANDROID_3.4.5/fs/configfs/item.c | 216 | ||||
| -rw-r--r-- | ANDROID_3.4.5/fs/configfs/mount.c | 183 | ||||
| -rw-r--r-- | ANDROID_3.4.5/fs/configfs/symlink.c | 314 |
9 files changed, 0 insertions, 3287 deletions
diff --git a/ANDROID_3.4.5/fs/configfs/Kconfig b/ANDROID_3.4.5/fs/configfs/Kconfig deleted file mode 100644 index 9febcdef..00000000 --- a/ANDROID_3.4.5/fs/configfs/Kconfig +++ /dev/null @@ -1,11 +0,0 @@ -config CONFIGFS_FS - tristate "Userspace-driven configuration filesystem" - select SYSFS - help - configfs is a RAM-based filesystem that provides the converse - of sysfs's functionality. Where sysfs is a filesystem-based - view of kernel objects, configfs is a filesystem-based manager - of kernel objects, or config_items. - - Both sysfs and configfs can and should exist together on the - same system. One is not a replacement for the other. diff --git a/ANDROID_3.4.5/fs/configfs/Makefile b/ANDROID_3.4.5/fs/configfs/Makefile deleted file mode 100644 index 00ffb278..00000000 --- a/ANDROID_3.4.5/fs/configfs/Makefile +++ /dev/null @@ -1,7 +0,0 @@ -# -# Makefile for the configfs virtual filesystem -# - -obj-$(CONFIG_CONFIGFS_FS) += configfs.o - -configfs-objs := inode.o file.o dir.o symlink.o mount.o item.o diff --git a/ANDROID_3.4.5/fs/configfs/configfs_internal.h b/ANDROID_3.4.5/fs/configfs/configfs_internal.h deleted file mode 100644 index b5f0a3b9..00000000 --- a/ANDROID_3.4.5/fs/configfs/configfs_internal.h +++ /dev/null @@ -1,160 +0,0 @@ -/* -*- mode: c; c-basic-offset:8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * configfs_internal.h - Internal stuff for configfs - * - * 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. - */ - -#include <linux/slab.h> -#include <linux/list.h> -#include <linux/spinlock.h> - -struct configfs_dirent { - atomic_t s_count; - int s_dependent_count; - struct list_head s_sibling; - struct list_head s_children; - struct list_head s_links; - void * s_element; - int s_type; - umode_t s_mode; - struct dentry * s_dentry; - struct iattr * s_iattr; -#ifdef CONFIG_LOCKDEP - int s_depth; -#endif -}; - -#define CONFIGFS_ROOT 0x0001 -#define CONFIGFS_DIR 0x0002 -#define CONFIGFS_ITEM_ATTR 0x0004 -#define CONFIGFS_ITEM_LINK 0x0020 -#define CONFIGFS_USET_DIR 0x0040 -#define CONFIGFS_USET_DEFAULT 0x0080 -#define CONFIGFS_USET_DROPPING 0x0100 -#define CONFIGFS_USET_IN_MKDIR 0x0200 -#define CONFIGFS_USET_CREATING 0x0400 -#define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR) - -extern struct mutex configfs_symlink_mutex; -extern spinlock_t configfs_dirent_lock; - -extern struct kmem_cache *configfs_dir_cachep; - -extern int configfs_is_root(struct config_item *item); - -extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *); -extern int configfs_create(struct dentry *, umode_t mode, int (*init)(struct inode *)); -extern int configfs_inode_init(void); -extern void configfs_inode_exit(void); - -extern int configfs_create_file(struct config_item *, const struct configfs_attribute *); -extern int configfs_make_dirent(struct configfs_dirent *, - struct dentry *, void *, umode_t, int); -extern int configfs_dirent_is_ready(struct configfs_dirent *); - -extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int); -extern void configfs_hash_and_remove(struct dentry * dir, const char * name); - -extern const unsigned char * configfs_get_name(struct configfs_dirent *sd); -extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent); -extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr); - -extern struct dentry *configfs_pin_fs(void); -extern void configfs_release_fs(void); - -extern struct rw_semaphore configfs_rename_sem; -extern const struct file_operations configfs_dir_operations; -extern const struct file_operations configfs_file_operations; -extern const struct file_operations bin_fops; -extern const struct inode_operations configfs_dir_inode_operations; -extern const struct inode_operations configfs_root_inode_operations; -extern const struct inode_operations configfs_symlink_inode_operations; -extern const struct dentry_operations configfs_dentry_ops; - -extern int configfs_symlink(struct inode *dir, struct dentry *dentry, - const char *symname); -extern int configfs_unlink(struct inode *dir, struct dentry *dentry); - -struct configfs_symlink { - struct list_head sl_list; - struct config_item *sl_target; -}; - -extern int configfs_create_link(struct configfs_symlink *sl, - struct dentry *parent, - struct dentry *dentry); - -static inline struct config_item * to_item(struct dentry * dentry) -{ - struct configfs_dirent * sd = dentry->d_fsdata; - return ((struct config_item *) sd->s_element); -} - -static inline struct configfs_attribute * to_attr(struct dentry * dentry) -{ - struct configfs_dirent * sd = dentry->d_fsdata; - return ((struct configfs_attribute *) sd->s_element); -} - -static inline struct config_item *configfs_get_config_item(struct dentry *dentry) -{ - struct config_item * item = NULL; - - spin_lock(&dentry->d_lock); - if (!d_unhashed(dentry)) { - struct configfs_dirent * sd = dentry->d_fsdata; - if (sd->s_type & CONFIGFS_ITEM_LINK) { - struct configfs_symlink * sl = sd->s_element; - item = config_item_get(sl->sl_target); - } else - item = config_item_get(sd->s_element); - } - spin_unlock(&dentry->d_lock); - - return item; -} - -static inline void release_configfs_dirent(struct configfs_dirent * sd) -{ - if (!(sd->s_type & CONFIGFS_ROOT)) { - kfree(sd->s_iattr); - kmem_cache_free(configfs_dir_cachep, sd); - } -} - -static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd) -{ - if (sd) { - WARN_ON(!atomic_read(&sd->s_count)); - atomic_inc(&sd->s_count); - } - return sd; -} - -static inline void configfs_put(struct configfs_dirent * sd) -{ - WARN_ON(!atomic_read(&sd->s_count)); - if (atomic_dec_and_test(&sd->s_count)) - release_configfs_dirent(sd); -} - diff --git a/ANDROID_3.4.5/fs/configfs/dir.c b/ANDROID_3.4.5/fs/configfs/dir.c deleted file mode 100644 index 7e6c52d8..00000000 --- a/ANDROID_3.4.5/fs/configfs/dir.c +++ /dev/null @@ -1,1756 +0,0 @@ -/* -*- 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/err.h> - -#include <linux/configfs.h> -#include "configfs_internal.h" - -DECLARE_RWSEM(configfs_rename_sem); -/* - * Protects mutations of configfs_dirent linkage together with proper i_mutex - * Also protects mutations of symlinks linkage to target configfs_dirent - * Mutators of configfs_dirent linkage must *both* have the proper inode locked - * and configfs_dirent_lock locked, in that order. - * This allows one to safely traverse configfs_dirent trees and symlinks without - * having to lock inodes. - * - * Protects setting of CONFIGFS_USET_DROPPING: checking the flag - * unlocked is not reliable unless in detach_groups() called from - * rmdir()/unregister() and from configfs_attach_group() - */ -DEFINE_SPINLOCK(configfs_dirent_lock); - -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); - /* Coordinate with configfs_readdir */ - spin_lock(&configfs_dirent_lock); - sd->s_dentry = NULL; - spin_unlock(&configfs_dirent_lock); - 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(const struct dentry *dentry) -{ - return 1; -} - -const struct dentry_operations configfs_dentry_ops = { - .d_iput = configfs_d_iput, - /* simple_delete_dentry() isn't exported */ - .d_delete = configfs_d_delete, -}; - -#ifdef CONFIG_LOCKDEP - -/* - * Helpers to make lockdep happy with our recursive locking of default groups' - * inodes (see configfs_attach_group() and configfs_detach_group()). - * We put default groups i_mutexes in separate classes according to their depth - * from the youngest non-default group ancestor. - * - * For a non-default group A having default groups A/B, A/C, and A/C/D, default - * groups A/B and A/C will have their inode's mutex in class - * default_group_class[0], and default group A/C/D will be in - * default_group_class[1]. - * - * The lock classes are declared and assigned in inode.c, according to the - * s_depth value. - * The s_depth value is initialized to -1, adjusted to >= 0 when attaching - * default groups, and reset to -1 when all default groups are attached. During - * attachment, if configfs_create() sees s_depth > 0, the lock class of the new - * inode's mutex is set to default_group_class[s_depth - 1]. - */ - -static void configfs_init_dirent_depth(struct configfs_dirent *sd) -{ - sd->s_depth = -1; -} - -static void configfs_set_dir_dirent_depth(struct configfs_dirent *parent_sd, - struct configfs_dirent *sd) -{ - int parent_depth = parent_sd->s_depth; - - if (parent_depth >= 0) - sd->s_depth = parent_depth + 1; -} - -static void -configfs_adjust_dir_dirent_depth_before_populate(struct configfs_dirent *sd) -{ - /* - * item's i_mutex class is already setup, so s_depth is now only - * used to set new sub-directories s_depth, which is always done - * with item's i_mutex locked. - */ - /* - * sd->s_depth == -1 iff we are a non default group. - * else (we are a default group) sd->s_depth > 0 (see - * create_dir()). - */ - if (sd->s_depth == -1) - /* - * We are a non default group and we are going to create - * default groups. - */ - sd->s_depth = 0; -} - -static void -configfs_adjust_dir_dirent_depth_after_populate(struct configfs_dirent *sd) -{ - /* We will not create default groups anymore. */ - sd->s_depth = -1; -} - -#else /* CONFIG_LOCKDEP */ - -static void configfs_init_dirent_depth(struct configfs_dirent *sd) -{ -} - -static void configfs_set_dir_dirent_depth(struct configfs_dirent *parent_sd, - struct configfs_dirent *sd) -{ -} - -static void -configfs_adjust_dir_dirent_depth_before_populate(struct configfs_dirent *sd) -{ -} - -static void -configfs_adjust_dir_dirent_depth_after_populate(struct configfs_dirent *sd) -{ -} - -#endif /* CONFIG_LOCKDEP */ - -/* - * 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, int type) -{ - struct configfs_dirent * sd; - - sd = kmem_cache_zalloc(configfs_dir_cachep, GFP_KERNEL); - if (!sd) - return ERR_PTR(-ENOMEM); - - atomic_set(&sd->s_count, 1); - INIT_LIST_HEAD(&sd->s_links); - INIT_LIST_HEAD(&sd->s_children); - sd->s_element = element; - sd->s_type = type; - configfs_init_dirent_depth(sd); - spin_lock(&configfs_dirent_lock); - if (parent_sd->s_type & CONFIGFS_USET_DROPPING) { - spin_unlock(&configfs_dirent_lock); - kmem_cache_free(configfs_dir_cachep, sd); - return ERR_PTR(-ENOENT); - } - list_add(&sd->s_sibling, &parent_sd->s_children); - spin_unlock(&configfs_dirent_lock); - - 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, type); - if (IS_ERR(sd)) - return PTR_ERR(sd); - - sd->s_mode = mode; - sd->s_dentry = dentry; - if (dentry) - dentry->d_fsdata = configfs_get(sd); - - 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 configfs_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 *d) -{ - int error; - umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO; - struct dentry *p = d->d_parent; - - BUG_ON(!k); - - 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 | CONFIGFS_USET_CREATING); - if (!error) { - configfs_set_dir_dirent_depth(p->d_fsdata, d->d_fsdata); - error = configfs_create(d, mode, init_dir); - if (!error) { - inc_nlink(p->d_inode); - } else { - struct configfs_dirent *sd = d->d_fsdata; - if (sd) { - spin_lock(&configfs_dirent_lock); - list_del_init(&sd->s_sibling); - spin_unlock(&configfs_dirent_lock); - 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. - * - * Note: user-created entries won't be allowed under this new directory - * until it is validated by configfs_dir_set_ready() - */ - -static int configfs_create_dir(struct config_item * item, struct dentry *dentry) -{ - int error = create_dir(item, dentry); - if (!error) - item->ci_dentry = dentry; - return error; -} - -/* - * Allow userspace to create new entries under a new directory created with - * configfs_create_dir(), and under all of its chidlren directories recursively. - * @sd configfs_dirent of the new directory to validate - * - * Caller must hold configfs_dirent_lock. - */ -static void configfs_dir_set_ready(struct configfs_dirent *sd) -{ - struct configfs_dirent *child_sd; - - sd->s_type &= ~CONFIGFS_USET_CREATING; - list_for_each_entry(child_sd, &sd->s_children, s_sibling) - if (child_sd->s_type & CONFIGFS_USET_CREATING) - configfs_dir_set_ready(child_sd); -} - -/* - * Check that a directory does not belong to a directory hierarchy being - * attached and not validated yet. - * @sd configfs_dirent of the directory to check - * - * @return non-zero iff the directory was validated - * - * Note: takes configfs_dirent_lock, so the result may change from false to true - * in two consecutive calls, but never from true to false. - */ -int configfs_dirent_is_ready(struct configfs_dirent *sd) -{ - int ret; - - spin_lock(&configfs_dirent_lock); - ret = !(sd->s_type & CONFIGFS_USET_CREATING); - spin_unlock(&configfs_dirent_lock); - - return ret; -} - -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) { - struct configfs_dirent *sd = dentry->d_fsdata; - if (sd) { - spin_lock(&configfs_dirent_lock); - list_del_init(&sd->s_sibling); - spin_unlock(&configfs_dirent_lock); - 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; - spin_lock(&configfs_dirent_lock); - list_del_init(&sd->s_sibling); - spin_unlock(&configfs_dirent_lock); - 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, 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. - * - * Caller holds the mutex of the item's inode - */ - -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, - configfs_init_file); - if (error) { - configfs_put(sd); - return error; - } - - 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; - - /* - * Fake invisibility if dir belongs to a group/default groups hierarchy - * being attached - * - * This forbids userspace to read/write attributes of items which may - * not complete their initialization, since the dentries of the - * attributes won't be instantiated. - */ - err = -ENOENT; - if (!configfs_dirent_is_ready(parent_sd)) - goto out; - - 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. - */ - if (dentry->d_name.len > NAME_MAX) - return ERR_PTR(-ENAMETOOLONG); - d_add(dentry, NULL); - return NULL; - } - -out: - return ERR_PTR(err); -} - -/* - * Only subdirectories count here. Files (CONFIGFS_NOT_PINNED) are - * attributes and are removed by rmdir(). We recurse, setting - * CONFIGFS_USET_DROPPING on all children that are candidates for - * default detach. - * If there is an error, the caller will reset the flags via - * configfs_detach_rollback(). - */ -static int configfs_detach_prep(struct dentry *dentry, struct mutex **wait_mutex) -{ - struct configfs_dirent *parent_sd = dentry->d_fsdata; - struct configfs_dirent *sd; - int ret; - - /* Mark that we're trying to drop the group */ - parent_sd->s_type |= CONFIGFS_USET_DROPPING; - - 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_element || - (sd->s_type & CONFIGFS_NOT_PINNED)) - continue; - if (sd->s_type & CONFIGFS_USET_DEFAULT) { - /* Abort if racing with mkdir() */ - if (sd->s_type & CONFIGFS_USET_IN_MKDIR) { - if (wait_mutex) - *wait_mutex = &sd->s_dentry->d_inode->i_mutex; - return -EAGAIN; - } - - /* - * Yup, recursive. If there's a problem, blame - * deep nesting of default_groups - */ - ret = configfs_detach_prep(sd->s_dentry, wait_mutex); - if (!ret) - continue; - } else - ret = -ENOTEMPTY; - - break; - } - -out: - return ret; -} - -/* - * Walk the tree, resetting CONFIGFS_USET_DROPPING wherever it was - * set. - */ -static void configfs_detach_rollback(struct dentry *dentry) -{ - struct configfs_dirent *parent_sd = dentry->d_fsdata; - struct configfs_dirent *sd; - - parent_sd->s_type &= ~CONFIGFS_USET_DROPPING; - - list_for_each_entry(sd, &parent_sd->s_children, s_sibling) - if (sd->s_type & CONFIGFS_USET_DEFAULT) - configfs_detach_rollback(sd->s_dentry); -} - -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; - spin_lock(&configfs_dirent_lock); - list_del_init(&sd->s_sibling); - spin_unlock(&configfs_dirent_lock); - 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; - - mutex_lock(&child->d_inode->i_mutex); - - configfs_detach_group(sd->s_element); - child->d_inode->i_flags |= S_DEAD; - dont_mount(child); - - 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 { - BUG_ON(child->d_inode); - d_drop(child); - dput(child); - } - } - - return ret; -} - -static int populate_groups(struct config_group *group) -{ - struct config_group *new_group; - int ret = 0; - int i; - - if (group->default_groups) { - for (i = 0; group->default_groups[i]; i++) { - new_group = group->default_groups[i]; - - ret = create_default_group(group, new_group); - if (ret) { - detach_groups(group); - break; - } - } - } - - return ret; -} - -/* - * All of link_obj/unlink_obj/link_group/unlink_group require that - * subsys->su_mutex 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) { - /* - * We are going to remove an inode and its dentry but - * the VFS may already have hit and used them. Thus, - * we must lock them as rmdir() would. - */ - mutex_lock(&dentry->d_inode->i_mutex); - configfs_remove_dir(item); - dentry->d_inode->i_flags |= S_DEAD; - dont_mount(dentry); - mutex_unlock(&dentry->d_inode->i_mutex); - d_delete(dentry); - } - } - - return ret; -} - -/* Caller holds the mutex of the item's inode */ -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; - - /* - * FYI, we're faking mkdir in populate_groups() - * We must lock the group's inode to avoid races with the VFS - * which can already hit the inode and try to add/remove entries - * under it. - * - * We must also lock the inode to remove it safely in case of - * error, as rmdir() would. - */ - mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); - configfs_adjust_dir_dirent_depth_before_populate(sd); - ret = populate_groups(to_config_group(item)); - if (ret) { - configfs_detach_item(item); - dentry->d_inode->i_flags |= S_DEAD; - dont_mount(dentry); - } - configfs_adjust_dir_dirent_depth_after_populate(sd); - mutex_unlock(&dentry->d_inode->i_mutex); - if (ret) - d_delete(dentry); - } - - return ret; -} - -/* Caller holds the mutex of the group's inode */ -static void configfs_detach_group(struct config_item *item) -{ - detach_groups(to_config_group(item)); - configfs_detach_item(item); -} - -/* - * After the item has been detached from the filesystem view, we are - * ready to tear it out of the hierarchy. Notify the client before - * we do that so they can perform any cleanup that requires - * navigating the hierarchy. A client does not need to provide this - * callback. The subsystem semaphore MUST be held by the caller, and - * references must be valid for both items. It also assumes the - * caller has validated ci_type. - */ -static void client_disconnect_notify(struct config_item *parent_item, - struct config_item *item) -{ - struct config_item_type *type; - - type = parent_item->ci_type; - BUG_ON(!type); - - if (type->ct_group_ops && type->ct_group_ops->disconnect_notify) - type->ct_group_ops->disconnect_notify(to_config_group(parent_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); -} - -#ifdef DEBUG -static void configfs_dump_one(struct configfs_dirent *sd, int level) -{ - printk(KERN_INFO "%*s\"%s\":\n", level, " ", configfs_get_name(sd)); - -#define type_print(_type) if (sd->s_type & _type) printk(KERN_INFO "%*s %s\n", level, " ", #_type); - type_print(CONFIGFS_ROOT); - type_print(CONFIGFS_DIR); - type_print(CONFIGFS_ITEM_ATTR); - type_print(CONFIGFS_ITEM_LINK); - type_print(CONFIGFS_USET_DIR); - type_print(CONFIGFS_USET_DEFAULT); - type_print(CONFIGFS_USET_DROPPING); -#undef type_print -} - -static int configfs_dump(struct configfs_dirent *sd, int level) -{ - struct configfs_dirent *child_sd; - int ret = 0; - - configfs_dump_one(sd, level); - - if (!(sd->s_type & (CONFIGFS_DIR|CONFIGFS_ROOT))) - return 0; - - list_for_each_entry(child_sd, &sd->s_children, s_sibling) { - ret = configfs_dump(child_sd, level + 2); - if (ret) - break; - } - - return ret; -} -#endif - - -/* - * configfs_depend_item() and configfs_undepend_item() - * - * WARNING: Do not call these from a configfs callback! - * - * This describes these functions and their helpers. - * - * Allow another kernel system to depend on a config_item. If this - * happens, the item cannot go away until the dependent can live without - * it. The idea is to give client modules as simple an interface as - * possible. When a system asks them to depend on an item, they just - * call configfs_depend_item(). If the item is live and the client - * driver is in good shape, we'll happily do the work for them. - * - * Why is the locking complex? Because configfs uses the VFS to handle - * all locking, but this function is called outside the normal - * VFS->configfs path. So it must take VFS locks to prevent the - * VFS->configfs stuff (configfs_mkdir(), configfs_rmdir(), etc). This is - * why you can't call these functions underneath configfs callbacks. - * - * Note, btw, that this can be called at *any* time, even when a configfs - * subsystem isn't registered, or when configfs is loading or unloading. - * Just like configfs_register_subsystem(). So we take the same - * precautions. We pin the filesystem. We lock configfs_dirent_lock. - * If we can find the target item in the - * configfs tree, it must be part of the subsystem tree as well, so we - * do not need the subsystem semaphore. Holding configfs_dirent_lock helps - * locking out mkdir() and rmdir(), who might be racing us. - */ - -/* - * configfs_depend_prep() - * - * Only subdirectories count here. Files (CONFIGFS_NOT_PINNED) are - * attributes. This is similar but not the same to configfs_detach_prep(). - * Note that configfs_detach_prep() expects the parent to be locked when it - * is called, but we lock the parent *inside* configfs_depend_prep(). We - * do that so we can unlock it if we find nothing. - * - * Here we do a depth-first search of the dentry hierarchy looking for - * our object. - * We deliberately ignore items tagged as dropping since they are virtually - * dead, as well as items in the middle of attachment since they virtually - * do not exist yet. This completes the locking out of racing mkdir() and - * rmdir(). - * Note: subdirectories in the middle of attachment start with s_type = - * CONFIGFS_DIR|CONFIGFS_USET_CREATING set by create_dir(). When - * CONFIGFS_USET_CREATING is set, we ignore the item. The actual set of - * s_type is in configfs_new_dirent(), which has configfs_dirent_lock. - * - * If the target is not found, -ENOENT is bubbled up. - * - * This adds a requirement that all config_items be unique! - * - * This is recursive. There isn't - * much on the stack, though, so folks that need this function - be careful - * about your stack! Patches will be accepted to make it iterative. - */ -static int configfs_depend_prep(struct dentry *origin, - struct config_item *target) -{ - struct configfs_dirent *child_sd, *sd = origin->d_fsdata; - int ret = 0; - - BUG_ON(!origin || !sd); - - if (sd->s_element == target) /* Boo-yah */ - goto out; - - list_for_each_entry(child_sd, &sd->s_children, s_sibling) { - if ((child_sd->s_type & CONFIGFS_DIR) && - !(child_sd->s_type & CONFIGFS_USET_DROPPING) && - !(child_sd->s_type & CONFIGFS_USET_CREATING)) { - ret = configfs_depend_prep(child_sd->s_dentry, - target); - if (!ret) - goto out; /* Child path boo-yah */ - } - } - - /* We looped all our children and didn't find target */ - ret = -ENOENT; - -out: - return ret; -} - -int configfs_depend_item(struct configfs_subsystem *subsys, - struct config_item *target) -{ - int ret; - struct configfs_dirent *p, *root_sd, *subsys_sd = NULL; - struct config_item *s_item = &subsys->su_group.cg_item; - struct dentry *root; - - /* - * Pin the configfs filesystem. This means we can safely access - * the root of the configfs filesystem. - */ - root = configfs_pin_fs(); - if (IS_ERR(root)) - return PTR_ERR(root); - - /* - * Next, lock the root directory. We're going to check that the - * subsystem is really registered, and so we need to lock out - * configfs_[un]register_subsystem(). - */ - mutex_lock(&root->d_inode->i_mutex); - - root_sd = root->d_fsdata; - - list_for_each_entry(p, &root_sd->s_children, s_sibling) { - if (p->s_type & CONFIGFS_DIR) { - if (p->s_element == s_item) { - subsys_sd = p; - break; - } - } - } - - if (!subsys_sd) { - ret = -ENOENT; - goto out_unlock_fs; - } - - /* Ok, now we can trust subsys/s_item */ - - spin_lock(&configfs_dirent_lock); - /* Scan the tree, return 0 if found */ - ret = configfs_depend_prep(subsys_sd->s_dentry, target); - if (ret) - goto out_unlock_dirent_lock; - - /* - * We are sure that the item is not about to be removed by rmdir(), and - * not in the middle of attachment by mkdir(). - */ - p = target->ci_dentry->d_fsdata; - p->s_dependent_count += 1; - -out_unlock_dirent_lock: - spin_unlock(&configfs_dirent_lock); -out_unlock_fs: - mutex_unlock(&root->d_inode->i_mutex); - - /* - * If we succeeded, the fs is pinned via other methods. If not, - * we're done with it anyway. So release_fs() is always right. - */ - configfs_release_fs(); - - return ret; -} -EXPORT_SYMBOL(configfs_depend_item); - -/* - * Release the dependent linkage. This is much simpler than - * configfs_depend_item() because we know that that the client driver is - * pinned, thus the subsystem is pinned, and therefore configfs is pinned. - */ -void configfs_undepend_item(struct configfs_subsystem *subsys, - struct config_item *target) -{ - struct configfs_dirent *sd; - - /* - * Since we can trust everything is pinned, we just need - * configfs_dirent_lock. - */ - spin_lock(&configfs_dirent_lock); - - sd = target->ci_dentry->d_fsdata; - BUG_ON(sd->s_dependent_count < 1); - - sd->s_dependent_count -= 1; - - /* - * After this unlock, we cannot trust the item to stay alive! - * DO NOT REFERENCE item after this unlock. - */ - spin_unlock(&configfs_dirent_lock); -} -EXPORT_SYMBOL(configfs_undepend_item); - -static int configfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) -{ - int ret = 0; - int module_got = 0; - struct config_group *group = NULL; - struct config_item *item = NULL; - struct config_item *parent_item; - struct configfs_subsystem *subsys; - struct configfs_dirent *sd; - struct config_item_type *type; - struct module *subsys_owner = NULL, *new_item_owner = NULL; - char *name; - - sd = dentry->d_parent->d_fsdata; - - /* - * Fake invisibility if dir belongs to a group/default groups hierarchy - * being attached - */ - if (!configfs_dirent_is_ready(sd)) { - ret = -ENOENT; - goto out; - } - - 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; - } - - /* - * The subsystem may belong to a different module than the item - * being created. We don't want to safely pin the new item but - * fail to pin the subsystem it sits under. - */ - if (!subsys->su_group.cg_item.ci_type) { - ret = -EINVAL; - goto out_put; - } - subsys_owner = subsys->su_group.cg_item.ci_type->ct_owner; - if (!try_module_get(subsys_owner)) { - ret = -EINVAL; - goto out_put; - } - - name = kmalloc(dentry->d_name.len + 1, GFP_KERNEL); - if (!name) { - ret = -ENOMEM; - goto out_subsys_put; - } - - snprintf(name, dentry->d_name.len + 1, "%s", dentry->d_name.name); - - mutex_lock(&subsys->su_mutex); - if (type->ct_group_ops->make_group) { - group = type->ct_group_ops->make_group(to_config_group(parent_item), name); - if (!group) - group = ERR_PTR(-ENOMEM); - if (!IS_ERR(group)) { - link_group(to_config_group(parent_item), group); - item = &group->cg_item; - } else - ret = PTR_ERR(group); - } else { - item = type->ct_group_ops->make_item(to_config_group(parent_item), name); - if (!item) - item = ERR_PTR(-ENOMEM); - if (!IS_ERR(item)) - link_obj(parent_item, item); - else - ret = PTR_ERR(item); - } - mutex_unlock(&subsys->su_mutex); - - kfree(name); - if (ret) { - /* - * If ret != 0, then link_obj() was never called. - * There are no extra references to clean up. - */ - goto out_subsys_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; - } - - new_item_owner = type->ct_owner; - if (!try_module_get(new_item_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; - - /* - * Make racing rmdir() fail if it did not tag parent with - * CONFIGFS_USET_DROPPING - * Note: if CONFIGFS_USET_DROPPING is already set, attach_group() will - * fail and let rmdir() terminate correctly - */ - spin_lock(&configfs_dirent_lock); - /* This will make configfs_detach_prep() fail */ - sd->s_type |= CONFIGFS_USET_IN_MKDIR; - spin_unlock(&configfs_dirent_lock); - - if (group) - ret = configfs_attach_group(parent_item, item, dentry); - else - ret = configfs_attach_item(parent_item, item, dentry); - - spin_lock(&configfs_dirent_lock); - sd->s_type &= ~CONFIGFS_USET_IN_MKDIR; - if (!ret) - configfs_dir_set_ready(dentry->d_fsdata); - spin_unlock(&configfs_dirent_lock); - -out_unlink: - if (ret) { - /* Tear down everything we built up */ - mutex_lock(&subsys->su_mutex); - - client_disconnect_notify(parent_item, item); - if (group) - unlink_group(group); - else - unlink_obj(item); - client_drop_item(parent_item, item); - - mutex_unlock(&subsys->su_mutex); - - if (module_got) - module_put(new_item_owner); - } - -out_subsys_put: - if (ret) - module_put(subsys_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 *subsys_owner = NULL, *dead_item_owner = NULL; - int ret; - - 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; - } - - /* configfs_mkdir() shouldn't have allowed this */ - BUG_ON(!subsys->su_group.cg_item.ci_type); - subsys_owner = subsys->su_group.cg_item.ci_type->ct_owner; - - /* - * Ensure that no racing symlink() will make detach_prep() fail while - * the new link is temporarily attached - */ - do { - struct mutex *wait_mutex; - - mutex_lock(&configfs_symlink_mutex); - spin_lock(&configfs_dirent_lock); - /* - * Here's where we check for dependents. We're protected by - * configfs_dirent_lock. - * If no dependent, atomically tag the item as dropping. - */ - ret = sd->s_dependent_count ? -EBUSY : 0; - if (!ret) { - ret = configfs_detach_prep(dentry, &wait_mutex); - if (ret) - configfs_detach_rollback(dentry); - } - spin_unlock(&configfs_dirent_lock); - mutex_unlock(&configfs_symlink_mutex); - - if (ret) { - if (ret != -EAGAIN) { - config_item_put(parent_item); - return ret; - } - - /* Wait until the racing operation terminates */ - mutex_lock(wait_mutex); - mutex_unlock(wait_mutex); - } - } while (ret == -EAGAIN); - - /* 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) - dead_item_owner = item->ci_type->ct_owner; - - if (sd->s_type & CONFIGFS_USET_DIR) { - configfs_detach_group(item); - - mutex_lock(&subsys->su_mutex); - client_disconnect_notify(parent_item, item); - unlink_group(to_config_group(item)); - } else { - configfs_detach_item(item); - - mutex_lock(&subsys->su_mutex); - client_disconnect_notify(parent_item, item); - unlink_obj(item); - } - - client_drop_item(parent_item, item); - mutex_unlock(&subsys->su_mutex); - - /* Drop our reference from above */ - config_item_put(item); - - module_put(dead_item_owner); - module_put(subsys_owner); - - return 0; -} - -const 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, -}; - -const struct inode_operations configfs_root_inode_operations = { - .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; - int err; - - mutex_lock(&dentry->d_inode->i_mutex); - /* - * Fake invisibility if dir belongs to a group/default groups hierarchy - * being attached - */ - err = -ENOENT; - if (configfs_dirent_is_ready(parent_sd)) { - file->private_data = configfs_new_dirent(parent_sd, NULL, 0); - if (IS_ERR(file->private_data)) - err = PTR_ERR(file->private_data); - else - err = 0; - } - mutex_unlock(&dentry->d_inode->i_mutex); - - return err; -} - -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); - spin_lock(&configfs_dirent_lock); - list_del_init(&cursor->s_sibling); - spin_unlock(&configfs_dirent_lock); - 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 super_block *sb = dentry->d_sb; - 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 = 0; - 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) { - spin_lock(&configfs_dirent_lock); - list_move(q, &parent_sd->s_children); - spin_unlock(&configfs_dirent_lock); - } - for (p=q->next; p!= &parent_sd->s_children; p=p->next) { - struct configfs_dirent *next; - const char * name; - int len; - struct inode *inode = NULL; - - next = list_entry(p, struct configfs_dirent, - s_sibling); - if (!next->s_element) - continue; - - name = configfs_get_name(next); - len = strlen(name); - - /* - * We'll have a dentry and an inode for - * PINNED items and for open attribute - * files. We lock here to prevent a race - * with configfs_d_iput() clearing - * s_dentry before calling iput(). - * - * Why do we go to the trouble? If - * someone has an attribute file open, - * the inode number should match until - * they close it. Beyond that, we don't - * care. - */ - spin_lock(&configfs_dirent_lock); - dentry = next->s_dentry; - if (dentry) - inode = dentry->d_inode; - if (inode) - ino = inode->i_ino; - spin_unlock(&configfs_dirent_lock); - if (!inode) - ino = iunique(sb, 2); - - if (filldir(dirent, name, len, filp->f_pos, ino, - dt_type(next)) < 0) - return 0; - - spin_lock(&configfs_dirent_lock); - list_move(q, p); - spin_unlock(&configfs_dirent_lock); - 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; - - spin_lock(&configfs_dirent_lock); - 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); - spin_unlock(&configfs_dirent_lock); - } - } - 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 dentry *root; - struct configfs_dirent *sd; - - root = configfs_pin_fs(); - if (IS_ERR(root)) - return PTR_ERR(root); - - if (!group->cg_item.ci_name) - group->cg_item.ci_name = group->cg_item.ci_namebuf; - - sd = root->d_fsdata; - link_group(to_config_group(sd->s_element), group); - - mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT); - - 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(root, &name); - if (dentry) { - d_add(dentry, NULL); - - err = configfs_attach_group(sd->s_element, &group->cg_item, - dentry); - if (err) { - BUG_ON(dentry->d_inode); - d_drop(dentry); - dput(dentry); - } else { - spin_lock(&configfs_dirent_lock); - configfs_dir_set_ready(dentry->d_fsdata); - spin_unlock(&configfs_dirent_lock); - } - } - - mutex_unlock(&root->d_inode->i_mutex); - - if (err) { - 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; - struct dentry *root = dentry->d_sb->s_root; - - if (dentry->d_parent != root) { - printk(KERN_ERR "configfs: Tried to unregister non-subsystem!\n"); - return; - } - - mutex_lock_nested(&root->d_inode->i_mutex, - I_MUTEX_PARENT); - mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); - mutex_lock(&configfs_symlink_mutex); - spin_lock(&configfs_dirent_lock); - if (configfs_detach_prep(dentry, NULL)) { - printk(KERN_ERR "configfs: Tried to unregister non-empty subsystem!\n"); - } - spin_unlock(&configfs_dirent_lock); - mutex_unlock(&configfs_symlink_mutex); - configfs_detach_group(&group->cg_item); - dentry->d_inode->i_flags |= S_DEAD; - dont_mount(dentry); - mutex_unlock(&dentry->d_inode->i_mutex); - - d_delete(dentry); - - mutex_unlock(&root->d_inode->i_mutex); - - dput(dentry); - - unlink_group(group); - configfs_release_fs(); -} - -EXPORT_SYMBOL(configfs_register_subsystem); -EXPORT_SYMBOL(configfs_unregister_subsystem); diff --git a/ANDROID_3.4.5/fs/configfs/file.c b/ANDROID_3.4.5/fs/configfs/file.c deleted file mode 100644 index 2b6cb23d..00000000 --- a/ANDROID_3.4.5/fs/configfs/file.c +++ /dev/null @@ -1,344 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * file.c - operations for regular (text) files. - * - * 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. - */ - -#include <linux/fs.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/mutex.h> -#include <asm/uaccess.h> - -#include <linux/configfs.h> -#include "configfs_internal.h" - -/* - * A simple attribute can only be 4096 characters. Why 4k? Because the - * original code limited it to PAGE_SIZE. That's a bad idea, though, - * because an attribute of 16k on ia64 won't work on x86. So we limit to - * 4k, our minimum common page size. - */ -#define SIMPLE_ATTR_SIZE 4096 - -struct configfs_buffer { - size_t count; - loff_t pos; - char * page; - struct configfs_item_operations * ops; - struct mutex mutex; - int needs_read_fill; -}; - - -/** - * fill_read_buffer - allocate and fill buffer from item. - * @dentry: dentry pointer. - * @buffer: data buffer for file. - * - * Allocate @buffer->page, if it hasn't been already, then call the - * config_item's show() method to fill the buffer with this attribute's - * data. - * This is called only once, on the file's first read. - */ -static int fill_read_buffer(struct dentry * dentry, struct configfs_buffer * buffer) -{ - struct configfs_attribute * attr = to_attr(dentry); - struct config_item * item = to_item(dentry->d_parent); - struct configfs_item_operations * ops = buffer->ops; - int ret = 0; - ssize_t count; - - if (!buffer->page) - buffer->page = (char *) get_zeroed_page(GFP_KERNEL); - if (!buffer->page) - return -ENOMEM; - - count = ops->show_attribute(item,attr,buffer->page); - buffer->needs_read_fill = 0; - BUG_ON(count > (ssize_t)SIMPLE_ATTR_SIZE); - if (count >= 0) - buffer->count = count; - else - ret = count; - return ret; -} - -/** - * configfs_read_file - read an attribute. - * @file: file pointer. - * @buf: buffer to fill. - * @count: number of bytes to read. - * @ppos: starting offset in file. - * - * Userspace wants to read an attribute file. The attribute descriptor - * is in the file's ->d_fsdata. The target item is in the directory's - * ->d_fsdata. - * - * We call fill_read_buffer() to allocate and fill the buffer from the - * item's show() method exactly once (if the read is happening from - * the beginning of the file). That should fill the entire buffer with - * all the data the item has to offer for that attribute. - * We then call flush_read_buffer() to copy the buffer to userspace - * in the increments specified. - */ - -static ssize_t -configfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *ppos) -{ - struct configfs_buffer * buffer = file->private_data; - ssize_t retval = 0; - - mutex_lock(&buffer->mutex); - if (buffer->needs_read_fill) { - if ((retval = fill_read_buffer(file->f_path.dentry,buffer))) - goto out; - } - pr_debug("%s: count = %zd, ppos = %lld, buf = %s\n", - __func__, count, *ppos, buffer->page); - retval = simple_read_from_buffer(buf, count, ppos, buffer->page, - buffer->count); -out: - mutex_unlock(&buffer->mutex); - return retval; -} - - -/** - * fill_write_buffer - copy buffer from userspace. - * @buffer: data buffer for file. - * @buf: data from user. - * @count: number of bytes in @userbuf. - * - * Allocate @buffer->page if it hasn't been already, then - * copy the user-supplied buffer into it. - */ - -static int -fill_write_buffer(struct configfs_buffer * buffer, const char __user * buf, size_t count) -{ - int error; - - if (!buffer->page) - buffer->page = (char *)__get_free_pages(GFP_KERNEL, 0); - if (!buffer->page) - return -ENOMEM; - - if (count >= SIMPLE_ATTR_SIZE) - count = SIMPLE_ATTR_SIZE - 1; - error = copy_from_user(buffer->page,buf,count); - buffer->needs_read_fill = 1; - /* if buf is assumed to contain a string, terminate it by \0, - * so e.g. sscanf() can scan the string easily */ - buffer->page[count] = 0; - return error ? -EFAULT : count; -} - - -/** - * flush_write_buffer - push buffer to config_item. - * @dentry: dentry to the attribute - * @buffer: data buffer for file. - * @count: number of bytes - * - * Get the correct pointers for the config_item and the attribute we're - * dealing with, then call the store() method for the attribute, - * passing the buffer that we acquired in fill_write_buffer(). - */ - -static int -flush_write_buffer(struct dentry * dentry, struct configfs_buffer * buffer, size_t count) -{ - struct configfs_attribute * attr = to_attr(dentry); - struct config_item * item = to_item(dentry->d_parent); - struct configfs_item_operations * ops = buffer->ops; - - return ops->store_attribute(item,attr,buffer->page,count); -} - - -/** - * configfs_write_file - write an attribute. - * @file: file pointer - * @buf: data to write - * @count: number of bytes - * @ppos: starting offset - * - * Similar to configfs_read_file(), though working in the opposite direction. - * We allocate and fill the data from the user in fill_write_buffer(), - * then push it to the config_item in flush_write_buffer(). - * There is no easy way for us to know if userspace is only doing a partial - * write, so we don't support them. We expect the entire buffer to come - * on the first write. - * Hint: if you're writing a value, first read the file, modify only the - * the value you're changing, then write entire buffer back. - */ - -static ssize_t -configfs_write_file(struct file *file, const char __user *buf, size_t count, loff_t *ppos) -{ - struct configfs_buffer * buffer = file->private_data; - ssize_t len; - - mutex_lock(&buffer->mutex); - len = fill_write_buffer(buffer, buf, count); - if (len > 0) - len = flush_write_buffer(file->f_path.dentry, buffer, count); - if (len > 0) - *ppos += len; - mutex_unlock(&buffer->mutex); - return len; -} - -static int check_perm(struct inode * inode, struct file * file) -{ - struct config_item *item = configfs_get_config_item(file->f_path.dentry->d_parent); - struct configfs_attribute * attr = to_attr(file->f_path.dentry); - struct configfs_buffer * buffer; - struct configfs_item_operations * ops = NULL; - int error = 0; - - if (!item || !attr) - goto Einval; - - /* Grab the module reference for this attribute if we have one */ - if (!try_module_get(attr->ca_owner)) { - error = -ENODEV; - goto Done; - } - - if (item->ci_type) - ops = item->ci_type->ct_item_ops; - else - goto Eaccess; - - /* File needs write support. - * The inode's perms must say it's ok, - * and we must have a store method. - */ - if (file->f_mode & FMODE_WRITE) { - - if (!(inode->i_mode & S_IWUGO) || !ops->store_attribute) - goto Eaccess; - - } - - /* File needs read support. - * The inode's perms must say it's ok, and we there - * must be a show method for it. - */ - if (file->f_mode & FMODE_READ) { - if (!(inode->i_mode & S_IRUGO) || !ops->show_attribute) - goto Eaccess; - } - - /* No error? Great, allocate a buffer for the file, and store it - * it in file->private_data for easy access. - */ - buffer = kzalloc(sizeof(struct configfs_buffer),GFP_KERNEL); - if (!buffer) { - error = -ENOMEM; - goto Enomem; - } - mutex_init(&buffer->mutex); - buffer->needs_read_fill = 1; - buffer->ops = ops; - file->private_data = buffer; - goto Done; - - Einval: - error = -EINVAL; - goto Done; - Eaccess: - error = -EACCES; - Enomem: - module_put(attr->ca_owner); - Done: - if (error && item) - config_item_put(item); - return error; -} - -static int configfs_open_file(struct inode * inode, struct file * filp) -{ - return check_perm(inode,filp); -} - -static int configfs_release(struct inode * inode, struct file * filp) -{ - struct config_item * item = to_item(filp->f_path.dentry->d_parent); - struct configfs_attribute * attr = to_attr(filp->f_path.dentry); - struct module * owner = attr->ca_owner; - struct configfs_buffer * buffer = filp->private_data; - - if (item) - config_item_put(item); - /* After this point, attr should not be accessed. */ - module_put(owner); - - if (buffer) { - if (buffer->page) - free_page((unsigned long)buffer->page); - mutex_destroy(&buffer->mutex); - kfree(buffer); - } - return 0; -} - -const struct file_operations configfs_file_operations = { - .read = configfs_read_file, - .write = configfs_write_file, - .llseek = generic_file_llseek, - .open = configfs_open_file, - .release = configfs_release, -}; - - -int configfs_add_file(struct dentry * dir, const struct configfs_attribute * attr, int type) -{ - struct configfs_dirent * parent_sd = dir->d_fsdata; - umode_t mode = (attr->ca_mode & S_IALLUGO) | S_IFREG; - int error = 0; - - mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_NORMAL); - error = configfs_make_dirent(parent_sd, NULL, (void *) attr, mode, type); - mutex_unlock(&dir->d_inode->i_mutex); - - return error; -} - - -/** - * configfs_create_file - create an attribute file for an item. - * @item: item we're creating for. - * @attr: atrribute descriptor. - */ - -int configfs_create_file(struct config_item * item, const struct configfs_attribute * attr) -{ - BUG_ON(!item || !item->ci_dentry || !attr); - - return configfs_add_file(item->ci_dentry, attr, - CONFIGFS_ITEM_ATTR); -} - diff --git a/ANDROID_3.4.5/fs/configfs/inode.c b/ANDROID_3.4.5/fs/configfs/inode.c deleted file mode 100644 index 0074362d..00000000 --- a/ANDROID_3.4.5/fs/configfs/inode.c +++ /dev/null @@ -1,296 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * inode.c - basic inode and dentry operations. - * - * 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. - * - * Please see Documentation/filesystems/configfs/configfs.txt for more - * information. - */ - -#undef DEBUG - -#include <linux/pagemap.h> -#include <linux/namei.h> -#include <linux/backing-dev.h> -#include <linux/capability.h> -#include <linux/sched.h> -#include <linux/lockdep.h> -#include <linux/slab.h> - -#include <linux/configfs.h> -#include "configfs_internal.h" - -#ifdef CONFIG_LOCKDEP -static struct lock_class_key default_group_class[MAX_LOCK_DEPTH]; -#endif - -static const struct address_space_operations configfs_aops = { - .readpage = simple_readpage, - .write_begin = simple_write_begin, - .write_end = simple_write_end, -}; - -static struct backing_dev_info configfs_backing_dev_info = { - .name = "configfs", - .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, -}; - -static const struct inode_operations configfs_inode_operations ={ - .setattr = configfs_setattr, -}; - -int configfs_setattr(struct dentry * dentry, struct iattr * iattr) -{ - struct inode * inode = dentry->d_inode; - struct configfs_dirent * sd = dentry->d_fsdata; - struct iattr * sd_iattr; - unsigned int ia_valid = iattr->ia_valid; - int error; - - if (!sd) - return -EINVAL; - - sd_iattr = sd->s_iattr; - if (!sd_iattr) { - /* setting attributes for the first time, allocate now */ - sd_iattr = kzalloc(sizeof(struct iattr), GFP_KERNEL); - if (!sd_iattr) - return -ENOMEM; - /* assign default attributes */ - sd_iattr->ia_mode = sd->s_mode; - sd_iattr->ia_uid = 0; - sd_iattr->ia_gid = 0; - sd_iattr->ia_atime = sd_iattr->ia_mtime = sd_iattr->ia_ctime = CURRENT_TIME; - sd->s_iattr = sd_iattr; - } - /* attributes were changed atleast once in past */ - - error = simple_setattr(dentry, iattr); - if (error) - return error; - - if (ia_valid & ATTR_UID) - sd_iattr->ia_uid = iattr->ia_uid; - if (ia_valid & ATTR_GID) - sd_iattr->ia_gid = iattr->ia_gid; - if (ia_valid & ATTR_ATIME) - sd_iattr->ia_atime = timespec_trunc(iattr->ia_atime, - inode->i_sb->s_time_gran); - if (ia_valid & ATTR_MTIME) - sd_iattr->ia_mtime = timespec_trunc(iattr->ia_mtime, - inode->i_sb->s_time_gran); - if (ia_valid & ATTR_CTIME) - sd_iattr->ia_ctime = timespec_trunc(iattr->ia_ctime, - inode->i_sb->s_time_gran); - if (ia_valid & ATTR_MODE) { - umode_t mode = iattr->ia_mode; - - if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID)) - mode &= ~S_ISGID; - sd_iattr->ia_mode = sd->s_mode = mode; - } - - return error; -} - -static inline void set_default_inode_attr(struct inode * inode, umode_t mode) -{ - inode->i_mode = mode; - inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; -} - -static inline void set_inode_attr(struct inode * inode, struct iattr * iattr) -{ - inode->i_mode = iattr->ia_mode; - inode->i_uid = iattr->ia_uid; - inode->i_gid = iattr->ia_gid; - inode->i_atime = iattr->ia_atime; - inode->i_mtime = iattr->ia_mtime; - inode->i_ctime = iattr->ia_ctime; -} - -struct inode *configfs_new_inode(umode_t mode, struct configfs_dirent *sd, - struct super_block *s) -{ - struct inode * inode = new_inode(s); - if (inode) { - inode->i_ino = get_next_ino(); - inode->i_mapping->a_ops = &configfs_aops; - inode->i_mapping->backing_dev_info = &configfs_backing_dev_info; - inode->i_op = &configfs_inode_operations; - - if (sd->s_iattr) { - /* sysfs_dirent has non-default attributes - * get them for the new inode from persistent copy - * in sysfs_dirent - */ - set_inode_attr(inode, sd->s_iattr); - } else - set_default_inode_attr(inode, mode); - } - return inode; -} - -#ifdef CONFIG_LOCKDEP - -static void configfs_set_inode_lock_class(struct configfs_dirent *sd, - struct inode *inode) -{ - int depth = sd->s_depth; - - if (depth > 0) { - if (depth <= ARRAY_SIZE(default_group_class)) { - lockdep_set_class(&inode->i_mutex, - &default_group_class[depth - 1]); - } else { - /* - * In practice the maximum level of locking depth is - * already reached. Just inform about possible reasons. - */ - printk(KERN_INFO "configfs: Too many levels of inodes" - " for the locking correctness validator.\n"); - printk(KERN_INFO "Spurious warnings may appear.\n"); - } - } -} - -#else /* CONFIG_LOCKDEP */ - -static void configfs_set_inode_lock_class(struct configfs_dirent *sd, - struct inode *inode) -{ -} - -#endif /* CONFIG_LOCKDEP */ - -int configfs_create(struct dentry * dentry, umode_t mode, int (*init)(struct inode *)) -{ - int error = 0; - struct inode *inode = NULL; - struct configfs_dirent *sd; - struct inode *p_inode; - - if (!dentry) - return -ENOENT; - - if (dentry->d_inode) - return -EEXIST; - - sd = dentry->d_fsdata; - inode = configfs_new_inode(mode, sd, dentry->d_sb); - if (!inode) - return -ENOMEM; - - p_inode = dentry->d_parent->d_inode; - p_inode->i_mtime = p_inode->i_ctime = CURRENT_TIME; - configfs_set_inode_lock_class(sd, inode); - - if (init) { - error = init(inode); - if (error) { - iput(inode); - return error; - } - } - d_instantiate(dentry, inode); - if (S_ISDIR(mode) || S_ISLNK(mode)) - dget(dentry); /* pin link and directory dentries in core */ - return error; -} - -/* - * Get the name for corresponding element represented by the given configfs_dirent - */ -const unsigned char * configfs_get_name(struct configfs_dirent *sd) -{ - struct configfs_attribute *attr; - - BUG_ON(!sd || !sd->s_element); - - /* These always have a dentry, so use that */ - if (sd->s_type & (CONFIGFS_DIR | CONFIGFS_ITEM_LINK)) - return sd->s_dentry->d_name.name; - - if (sd->s_type & CONFIGFS_ITEM_ATTR) { - attr = sd->s_element; - return attr->ca_name; - } - return NULL; -} - - -/* - * Unhashes the dentry corresponding to given configfs_dirent - * Called with parent inode's i_mutex held. - */ -void configfs_drop_dentry(struct configfs_dirent * sd, struct dentry * parent) -{ - struct dentry * dentry = sd->s_dentry; - - if (dentry) { - spin_lock(&dentry->d_lock); - if (!(d_unhashed(dentry) && dentry->d_inode)) { - dget_dlock(dentry); - __d_drop(dentry); - spin_unlock(&dentry->d_lock); - simple_unlink(parent->d_inode, dentry); - } else - spin_unlock(&dentry->d_lock); - } -} - -void configfs_hash_and_remove(struct dentry * dir, const char * name) -{ - struct configfs_dirent * sd; - struct configfs_dirent * parent_sd = dir->d_fsdata; - - if (dir->d_inode == NULL) - /* no inode means this hasn't been made visible yet */ - return; - - mutex_lock(&dir->d_inode->i_mutex); - list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { - if (!sd->s_element) - continue; - if (!strcmp(configfs_get_name(sd), name)) { - spin_lock(&configfs_dirent_lock); - list_del_init(&sd->s_sibling); - spin_unlock(&configfs_dirent_lock); - configfs_drop_dentry(sd, dir); - configfs_put(sd); - break; - } - } - mutex_unlock(&dir->d_inode->i_mutex); -} - -int __init configfs_inode_init(void) -{ - return bdi_init(&configfs_backing_dev_info); -} - -void configfs_inode_exit(void) -{ - bdi_destroy(&configfs_backing_dev_info); -} diff --git a/ANDROID_3.4.5/fs/configfs/item.c b/ANDROID_3.4.5/fs/configfs/item.c deleted file mode 100644 index 50cee7f9..00000000 --- a/ANDROID_3.4.5/fs/configfs/item.c +++ /dev/null @@ -1,216 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * item.c - library routines for handling generic config items - * - * 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 kobject: - * kobject is Copyright (c) 2002-2003 Patrick Mochel - * - * configfs Copyright (C) 2005 Oracle. All rights reserved. - * - * Please see the file Documentation/filesystems/configfs/configfs.txt for - * critical information about using the config_item interface. - */ - -#include <linux/string.h> -#include <linux/module.h> -#include <linux/stat.h> -#include <linux/slab.h> - -#include <linux/configfs.h> - - -static inline struct config_item * to_item(struct list_head * entry) -{ - return container_of(entry,struct config_item,ci_entry); -} - -/* Evil kernel */ -static void config_item_release(struct kref *kref); - -/** - * config_item_init - initialize item. - * @item: item in question. - */ -void config_item_init(struct config_item * item) -{ - kref_init(&item->ci_kref); - INIT_LIST_HEAD(&item->ci_entry); -} - -/** - * config_item_set_name - Set the name of an item - * @item: item. - * @name: name. - * - * If strlen(name) >= CONFIGFS_ITEM_NAME_LEN, then use a - * dynamically allocated string that @item->ci_name points to. - * Otherwise, use the static @item->ci_namebuf array. - */ -int config_item_set_name(struct config_item * item, const char * fmt, ...) -{ - int error = 0; - int limit = CONFIGFS_ITEM_NAME_LEN; - int need; - va_list args; - char * name; - - /* - * First, try the static array - */ - va_start(args,fmt); - need = vsnprintf(item->ci_namebuf,limit,fmt,args); - va_end(args); - if (need < limit) - name = item->ci_namebuf; - else { - /* - * Need more space? Allocate it and try again - */ - limit = need + 1; - name = kmalloc(limit,GFP_KERNEL); - if (!name) { - error = -ENOMEM; - goto Done; - } - va_start(args,fmt); - need = vsnprintf(name,limit,fmt,args); - va_end(args); - - /* Still? Give up. */ - if (need >= limit) { - kfree(name); - error = -EFAULT; - goto Done; - } - } - - /* Free the old name, if necessary. */ - if (item->ci_name && item->ci_name != item->ci_namebuf) - kfree(item->ci_name); - - /* Now, set the new name */ - item->ci_name = name; - Done: - return error; -} - -EXPORT_SYMBOL(config_item_set_name); - -void config_item_init_type_name(struct config_item *item, - const char *name, - struct config_item_type *type) -{ - config_item_set_name(item, name); - item->ci_type = type; - config_item_init(item); -} -EXPORT_SYMBOL(config_item_init_type_name); - -void config_group_init_type_name(struct config_group *group, const char *name, - struct config_item_type *type) -{ - config_item_set_name(&group->cg_item, name); - group->cg_item.ci_type = type; - config_group_init(group); -} -EXPORT_SYMBOL(config_group_init_type_name); - -struct config_item * config_item_get(struct config_item * item) -{ - if (item) - kref_get(&item->ci_kref); - return item; -} - -static void config_item_cleanup(struct config_item * item) -{ - struct config_item_type * t = item->ci_type; - struct config_group * s = item->ci_group; - struct config_item * parent = item->ci_parent; - - pr_debug("config_item %s: cleaning up\n",config_item_name(item)); - if (item->ci_name != item->ci_namebuf) - kfree(item->ci_name); - item->ci_name = NULL; - if (t && t->ct_item_ops && t->ct_item_ops->release) - t->ct_item_ops->release(item); - if (s) - config_group_put(s); - if (parent) - config_item_put(parent); -} - -static void config_item_release(struct kref *kref) -{ - config_item_cleanup(container_of(kref, struct config_item, ci_kref)); -} - -/** - * config_item_put - decrement refcount for item. - * @item: item. - * - * Decrement the refcount, and if 0, call config_item_cleanup(). - */ -void config_item_put(struct config_item * item) -{ - if (item) - kref_put(&item->ci_kref, config_item_release); -} - -/** - * config_group_init - initialize a group for use - * @k: group - */ -void config_group_init(struct config_group *group) -{ - config_item_init(&group->cg_item); - INIT_LIST_HEAD(&group->cg_children); -} - -/** - * config_group_find_item - search for item in group. - * @group: group we're looking in. - * @name: item's name. - * - * Iterate over @group->cg_list, looking for a matching config_item. - * If matching item is found take a reference and return the item. - * Caller must have locked group via @group->cg_subsys->su_mtx. - */ -struct config_item *config_group_find_item(struct config_group *group, - const char *name) -{ - struct list_head * entry; - struct config_item * ret = NULL; - - list_for_each(entry,&group->cg_children) { - struct config_item * item = to_item(entry); - if (config_item_name(item) && - !strcmp(config_item_name(item), name)) { - ret = config_item_get(item); - break; - } - } - return ret; -} - -EXPORT_SYMBOL(config_item_init); -EXPORT_SYMBOL(config_group_init); -EXPORT_SYMBOL(config_item_get); -EXPORT_SYMBOL(config_item_put); -EXPORT_SYMBOL(config_group_find_item); diff --git a/ANDROID_3.4.5/fs/configfs/mount.c b/ANDROID_3.4.5/fs/configfs/mount.c deleted file mode 100644 index aee0a7eb..00000000 --- a/ANDROID_3.4.5/fs/configfs/mount.c +++ /dev/null @@ -1,183 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * mount.c - operations for initializing and mounting configfs. - * - * 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. - */ - -#include <linux/fs.h> -#include <linux/module.h> -#include <linux/mount.h> -#include <linux/pagemap.h> -#include <linux/init.h> -#include <linux/slab.h> - -#include <linux/configfs.h> -#include "configfs_internal.h" - -/* Random magic number */ -#define CONFIGFS_MAGIC 0x62656570 - -static struct vfsmount *configfs_mount = NULL; -struct kmem_cache *configfs_dir_cachep; -static int configfs_mnt_count = 0; - -static const struct super_operations configfs_ops = { - .statfs = simple_statfs, - .drop_inode = generic_delete_inode, -}; - -static struct config_group configfs_root_group = { - .cg_item = { - .ci_namebuf = "root", - .ci_name = configfs_root_group.cg_item.ci_namebuf, - }, -}; - -int configfs_is_root(struct config_item *item) -{ - return item == &configfs_root_group.cg_item; -} - -static struct configfs_dirent configfs_root = { - .s_sibling = LIST_HEAD_INIT(configfs_root.s_sibling), - .s_children = LIST_HEAD_INIT(configfs_root.s_children), - .s_element = &configfs_root_group.cg_item, - .s_type = CONFIGFS_ROOT, - .s_iattr = NULL, -}; - -static int configfs_fill_super(struct super_block *sb, void *data, int silent) -{ - struct inode *inode; - struct dentry *root; - - sb->s_blocksize = PAGE_CACHE_SIZE; - sb->s_blocksize_bits = PAGE_CACHE_SHIFT; - sb->s_magic = CONFIGFS_MAGIC; - sb->s_op = &configfs_ops; - sb->s_time_gran = 1; - - inode = configfs_new_inode(S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO, - &configfs_root, sb); - if (inode) { - inode->i_op = &configfs_root_inode_operations; - inode->i_fop = &configfs_dir_operations; - /* directory inodes start off with i_nlink == 2 (for "." entry) */ - inc_nlink(inode); - } else { - pr_debug("configfs: could not get root inode\n"); - return -ENOMEM; - } - - root = d_make_root(inode); - if (!root) { - pr_debug("%s: could not get root dentry!\n",__func__); - return -ENOMEM; - } - config_group_init(&configfs_root_group); - configfs_root_group.cg_item.ci_dentry = root; - root->d_fsdata = &configfs_root; - sb->s_root = root; - sb->s_d_op = &configfs_dentry_ops; /* the rest get that */ - return 0; -} - -static struct dentry *configfs_do_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) -{ - return mount_single(fs_type, flags, data, configfs_fill_super); -} - -static struct file_system_type configfs_fs_type = { - .owner = THIS_MODULE, - .name = "configfs", - .mount = configfs_do_mount, - .kill_sb = kill_litter_super, -}; - -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; -} - -void configfs_release_fs(void) -{ - simple_release_fs(&configfs_mount, &configfs_mnt_count); -} - - -static struct kobject *config_kobj; - -static int __init configfs_init(void) -{ - int err = -ENOMEM; - - configfs_dir_cachep = kmem_cache_create("configfs_dir_cache", - sizeof(struct configfs_dirent), - 0, 0, NULL); - if (!configfs_dir_cachep) - goto out; - - config_kobj = kobject_create_and_add("config", kernel_kobj); - if (!config_kobj) - goto out2; - - err = configfs_inode_init(); - if (err) - goto out3; - - err = register_filesystem(&configfs_fs_type); - if (err) - goto out4; - - return 0; -out4: - printk(KERN_ERR "configfs: Unable to register filesystem!\n"); - configfs_inode_exit(); -out3: - kobject_put(config_kobj); -out2: - kmem_cache_destroy(configfs_dir_cachep); - configfs_dir_cachep = NULL; -out: - return err; -} - -static void __exit configfs_exit(void) -{ - unregister_filesystem(&configfs_fs_type); - kobject_put(config_kobj); - kmem_cache_destroy(configfs_dir_cachep); - configfs_dir_cachep = NULL; - configfs_inode_exit(); -} - -MODULE_AUTHOR("Oracle"); -MODULE_LICENSE("GPL"); -MODULE_VERSION("0.0.2"); -MODULE_DESCRIPTION("Simple RAM filesystem for user driven kernel subsystem configuration."); - -module_init(configfs_init); -module_exit(configfs_exit); diff --git a/ANDROID_3.4.5/fs/configfs/symlink.c b/ANDROID_3.4.5/fs/configfs/symlink.c deleted file mode 100644 index cc9f2546..00000000 --- a/ANDROID_3.4.5/fs/configfs/symlink.c +++ /dev/null @@ -1,314 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * symlink.c - operations for configfs symlinks. - * - * 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. - */ - -#include <linux/fs.h> -#include <linux/module.h> -#include <linux/namei.h> -#include <linux/slab.h> - -#include <linux/configfs.h> -#include "configfs_internal.h" - -/* Protects attachments of new symlinks */ -DEFINE_MUTEX(configfs_symlink_mutex); - -static int item_depth(struct config_item * item) -{ - struct config_item * p = item; - int depth = 0; - do { depth++; } while ((p = p->ci_parent) && !configfs_is_root(p)); - return depth; -} - -static int item_path_length(struct config_item * item) -{ - struct config_item * p = item; - int length = 1; - do { - length += strlen(config_item_name(p)) + 1; - p = p->ci_parent; - } while (p && !configfs_is_root(p)); - return length; -} - -static void fill_item_path(struct config_item * item, char * buffer, int length) -{ - struct config_item * p; - - --length; - for (p = item; p && !configfs_is_root(p); p = p->ci_parent) { - int cur = strlen(config_item_name(p)); - - /* back up enough to print this bus id with '/' */ - length -= cur; - strncpy(buffer + length,config_item_name(p),cur); - *(buffer + --length) = '/'; - } -} - -static int create_link(struct config_item *parent_item, - struct config_item *item, - struct dentry *dentry) -{ - struct configfs_dirent *target_sd = item->ci_dentry->d_fsdata; - struct configfs_symlink *sl; - int ret; - - ret = -ENOENT; - if (!configfs_dirent_is_ready(target_sd)) - goto out; - ret = -ENOMEM; - sl = kmalloc(sizeof(struct configfs_symlink), GFP_KERNEL); - if (sl) { - sl->sl_target = config_item_get(item); - spin_lock(&configfs_dirent_lock); - if (target_sd->s_type & CONFIGFS_USET_DROPPING) { - spin_unlock(&configfs_dirent_lock); - config_item_put(item); - kfree(sl); - return -ENOENT; - } - list_add(&sl->sl_list, &target_sd->s_links); - spin_unlock(&configfs_dirent_lock); - ret = configfs_create_link(sl, parent_item->ci_dentry, - dentry); - if (ret) { - spin_lock(&configfs_dirent_lock); - list_del_init(&sl->sl_list); - spin_unlock(&configfs_dirent_lock); - config_item_put(item); - kfree(sl); - } - } - -out: - return ret; -} - - -static int get_target(const char *symname, struct path *path, - struct config_item **target, struct super_block *sb) -{ - int ret; - - ret = kern_path(symname, LOOKUP_FOLLOW|LOOKUP_DIRECTORY, path); - if (!ret) { - if (path->dentry->d_sb == sb) { - *target = configfs_get_config_item(path->dentry); - if (!*target) { - ret = -ENOENT; - path_put(path); - } - } else { - ret = -EPERM; - path_put(path); - } - } - - return ret; -} - - -int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) -{ - int ret; - struct path path; - struct configfs_dirent *sd; - struct config_item *parent_item; - struct config_item *target_item = NULL; - struct config_item_type *type; - - sd = dentry->d_parent->d_fsdata; - /* - * Fake invisibility if dir belongs to a group/default groups hierarchy - * being attached - */ - ret = -ENOENT; - if (!configfs_dirent_is_ready(sd)) - goto out; - - parent_item = configfs_get_config_item(dentry->d_parent); - type = parent_item->ci_type; - - ret = -EPERM; - if (!type || !type->ct_item_ops || - !type->ct_item_ops->allow_link) - goto out_put; - - ret = get_target(symname, &path, &target_item, dentry->d_sb); - if (ret) - goto out_put; - - ret = type->ct_item_ops->allow_link(parent_item, target_item); - if (!ret) { - mutex_lock(&configfs_symlink_mutex); - ret = create_link(parent_item, target_item, dentry); - mutex_unlock(&configfs_symlink_mutex); - if (ret && type->ct_item_ops->drop_link) - type->ct_item_ops->drop_link(parent_item, - target_item); - } - - config_item_put(target_item); - path_put(&path); - -out_put: - config_item_put(parent_item); - -out: - return ret; -} - -int configfs_unlink(struct inode *dir, struct dentry *dentry) -{ - struct configfs_dirent *sd = dentry->d_fsdata; - struct configfs_symlink *sl; - struct config_item *parent_item; - struct config_item_type *type; - int ret; - - ret = -EPERM; /* What lack-of-symlink returns */ - if (!(sd->s_type & CONFIGFS_ITEM_LINK)) - goto out; - - sl = sd->s_element; - - parent_item = configfs_get_config_item(dentry->d_parent); - type = parent_item->ci_type; - - spin_lock(&configfs_dirent_lock); - list_del_init(&sd->s_sibling); - spin_unlock(&configfs_dirent_lock); - configfs_drop_dentry(sd, dentry->d_parent); - dput(dentry); - configfs_put(sd); - - /* - * drop_link() must be called before - * list_del_init(&sl->sl_list), so that the order of - * drop_link(this, target) and drop_item(target) is preserved. - */ - if (type && type->ct_item_ops && - type->ct_item_ops->drop_link) - type->ct_item_ops->drop_link(parent_item, - sl->sl_target); - - spin_lock(&configfs_dirent_lock); - list_del_init(&sl->sl_list); - spin_unlock(&configfs_dirent_lock); - - /* Put reference from create_link() */ - config_item_put(sl->sl_target); - kfree(sl); - - config_item_put(parent_item); - - ret = 0; - -out: - return ret; -} - -static int configfs_get_target_path(struct config_item * item, struct config_item * target, - char *path) -{ - char * s; - int depth, size; - - depth = item_depth(item); - size = item_path_length(target) + depth * 3 - 1; - if (size > PATH_MAX) - return -ENAMETOOLONG; - - pr_debug("%s: depth = %d, size = %d\n", __func__, depth, size); - - for (s = path; depth--; s += 3) - strcpy(s,"../"); - - fill_item_path(target, path, size); - pr_debug("%s: path = '%s'\n", __func__, path); - - return 0; -} - -static int configfs_getlink(struct dentry *dentry, char * path) -{ - struct config_item *item, *target_item; - int error = 0; - - item = configfs_get_config_item(dentry->d_parent); - if (!item) - return -EINVAL; - - target_item = configfs_get_config_item(dentry); - if (!target_item) { - config_item_put(item); - return -EINVAL; - } - - down_read(&configfs_rename_sem); - error = configfs_get_target_path(item, target_item, path); - up_read(&configfs_rename_sem); - - config_item_put(item); - config_item_put(target_item); - return error; - -} - -static void *configfs_follow_link(struct dentry *dentry, struct nameidata *nd) -{ - int error = -ENOMEM; - unsigned long page = get_zeroed_page(GFP_KERNEL); - - if (page) { - error = configfs_getlink(dentry, (char *)page); - if (!error) { - nd_set_link(nd, (char *)page); - return (void *)page; - } - } - - nd_set_link(nd, ERR_PTR(error)); - return NULL; -} - -static void configfs_put_link(struct dentry *dentry, struct nameidata *nd, - void *cookie) -{ - if (cookie) { - unsigned long page = (unsigned long)cookie; - free_page(page); - } -} - -const struct inode_operations configfs_symlink_inode_operations = { - .follow_link = configfs_follow_link, - .readlink = generic_readlink, - .put_link = configfs_put_link, - .setattr = configfs_setattr, -}; - |