605 lines
17 KiB
C
605 lines
17 KiB
C
/*
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* fs/sdcardfs/sdcardfs.h
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*
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* The sdcardfs v2.0
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* This file system replaces the sdcard daemon on Android
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* On version 2.0, some of the daemon functions have been ported
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* to support the multi-user concepts of Android 4.4
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*
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* Copyright (c) 2013 Samsung Electronics Co. Ltd
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* Authors: Daeho Jeong, Woojoong Lee, Seunghwan Hyun,
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* Sunghwan Yun, Sungjong Seo
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*
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* This program has been developed as a stackable file system based on
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* the WrapFS which written by
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*
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* Copyright (c) 1998-2011 Erez Zadok
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* Copyright (c) 2009 Shrikar Archak
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* Copyright (c) 2003-2011 Stony Brook University
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* Copyright (c) 2003-2011 The Research Foundation of SUNY
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*
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* This file is dual licensed. It may be redistributed and/or modified
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* under the terms of the Apache 2.0 License OR version 2 of the GNU
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* General Public License.
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*/
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#ifndef _SDCARDFS_H_
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#define _SDCARDFS_H_
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#include <linux/dcache.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/seq_file.h>
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#include <linux/statfs.h>
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#include <linux/fs_stack.h>
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#include <linux/magic.h>
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/security.h>
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#include <linux/string.h>
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#include <linux/ratelimit.h>
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#include <linux/hashtable.h>
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#include "multiuser.h"
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/* the file system name */
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#define SDCARDFS_NAME "sdcardfs"
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/* sdcardfs root inode number */
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#define SDCARDFS_ROOT_INO 1
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/* useful for tracking code reachability */
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#define UDBG printk(KERN_DEFAULT "DBG:%s:%s:%d\n", __FILE__, __func__, __LINE__)
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#define SDCARDFS_DIRENT_SIZE 256
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/* temporary static uid settings for development */
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#define AID_ROOT 0 /* uid for accessing /mnt/sdcard & extSdcard */
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#define AID_MEDIA_RW 1023 /* internal media storage write access */
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#define AID_SDCARD_RW 1015 /* external storage write access */
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#define AID_SDCARD_R 1028 /* external storage read access */
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#define AID_SDCARD_PICS 1033 /* external storage photos access */
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#define AID_SDCARD_AV 1034 /* external storage audio/video access */
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#define AID_SDCARD_ALL 1035 /* access all users external storage */
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#define AID_PACKAGE_INFO 1027
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#define AID_EVERYBODY 9997
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/* OVERRIDE_CRED() and REVERT_CRED()
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* OVERRID_CRED()
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* backup original task->cred
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* and modifies task->cred->fsuid/fsgid to specified value.
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* REVERT_CRED()
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* restore original task->cred->fsuid/fsgid.
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* These two macro should be used in pair, and OVERRIDE_CRED() should be
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* placed at the beginning of a function, right after variable declaration.
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*/
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#define OVERRIDE_CRED(sdcardfs_sbi, saved_cred) do { \
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saved_cred = override_fsids(sdcardfs_sbi->options.fs_low_uid, \
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sdcardfs_sbi->options.fs_low_gid); \
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if (!saved_cred) { \
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return -ENOMEM; \
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} \
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} while (0)
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#define OVERRIDE_CRED_PTR(sdcardfs_sbi, saved_cred) do { \
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saved_cred = override_fsids(sdcardfs_sbi->options.fs_low_uid, \
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sdcardfs_sbi->options.fs_low_gid); \
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if (!saved_cred) { \
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return ERR_PTR(-ENOMEM); \
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} \
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} while (0)
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#define OVERRIDE_ROOT_CRED(saved_cred) do { \
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saved_cred = override_fsids(0, 0); \
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if (!saved_cred) { \
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return -ENOMEM; \
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} \
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} while (0)
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#define REVERT_CRED(saved_cred) revert_fsids(saved_cred)
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#define DEBUG_CRED() do { \
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printk("KAKJAGI: %s:%d fsuid %d fsgid %d\n", \
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__FUNCTION__, __LINE__, \
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(int)current->cred->fsuid, \
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(int)current->cred->fsgid); \
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} while (0)
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/* Permission mode for a specific node. Controls how file permissions
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* are derived for children nodes. */
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typedef enum {
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/* Nothing special; this node should just inherit from its parent. */
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PERM_INHERIT,
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/* This node is one level above a normal root; used for legacy layouts
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* which use the first level to represent user_id. */
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PERM_PRE_ROOT,
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/* This node is "/" */
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PERM_ROOT,
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/* This node is "/Android" */
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PERM_ANDROID,
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/* This node is "/Android/data" */
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PERM_ANDROID_DATA,
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/* This node is "/Android/obb" */
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PERM_ANDROID_OBB,
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/* This node is "/Android/media" */
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PERM_ANDROID_MEDIA,
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/* knox folder */
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PERM_ANDROID_KNOX,
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/* knox user folder*/
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PERM_ANDROID_KNOX_USER,
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/* knox Android folder*/
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PERM_ANDROID_KNOX_ANDROID,
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/* knox shared folder */
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PERM_ANDROID_KNOX_SHARED,
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/* knox data folder */
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PERM_ANDROID_KNOX_DATA,
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/* knox package data folder */
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PERM_ANDROID_KNOX_PACKAGE_DATA
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} perm_t;
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typedef enum {
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LOWER_FS_EXT4,
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LOWER_FS_FAT,
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} lower_fs_t;
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typedef enum {
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TYPE_NONE,
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TYPE_DEFAULT,
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TYPE_READ,
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TYPE_WRITE,
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} type_t;
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struct sdcardfs_sb_info;
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struct sdcardfs_mount_options;
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/* Do not directly use this function. Use OVERRIDE_CRED() instead. */
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const struct cred *override_fsids(uid_t fsuid, gid_t fsgid);
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/* Do not directly use this function, use REVERT_CRED() instead. */
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void revert_fsids(const struct cred *old_cred);
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/* operations vectors defined in specific files */
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extern const struct file_operations sdcardfs_main_fops;
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extern const struct file_operations sdcardfs_dir_fops;
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extern const struct inode_operations sdcardfs_main_iops;
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extern const struct inode_operations sdcardfs_dir_iops;
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extern const struct inode_operations sdcardfs_symlink_iops;
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extern const struct super_operations sdcardfs_sops;
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extern const struct super_operations sdcardfs_multimount_sops;
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extern const struct dentry_operations sdcardfs_ci_dops;
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extern const struct address_space_operations sdcardfs_aops, sdcardfs_dummy_aops;
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extern const struct vm_operations_struct sdcardfs_vm_ops;
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extern int sdcardfs_init_inode_cache(void);
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extern void sdcardfs_destroy_inode_cache(void);
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extern int sdcardfs_init_dentry_cache(void);
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extern void sdcardfs_destroy_dentry_cache(void);
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extern int new_dentry_private_data(struct dentry *dentry);
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extern void free_dentry_private_data(struct dentry *dentry);
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extern struct dentry *sdcardfs_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags);
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extern int sdcardfs_interpose(struct dentry *dentry, struct super_block *sb,
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struct path *lower_path);
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#ifdef SDCARD_FS_XATTR
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extern int sdcardfs_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
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extern ssize_t sdcardfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size);
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extern ssize_t sdcardfs_listxattr(struct dentry *dentry, char *list, size_t size);
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extern int sdcardfs_removexattr(struct dentry *dentry, const char *name);
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#endif // SDCARD_FS_XATTR
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/* file private data */
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struct sdcardfs_file_info {
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struct file *lower_file;
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const struct vm_operations_struct *lower_vm_ops;
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};
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/* sdcardfs inode data in memory */
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struct sdcardfs_inode_info {
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struct inode *lower_inode;
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/* state derived based on current position in hierachy
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*/
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perm_t perm;
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userid_t userid;
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uid_t d_uid;
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gid_t d_gid;
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bool under_android;
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struct inode vfs_inode;
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};
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/* sdcardfs dentry data in memory */
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struct sdcardfs_dentry_info {
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spinlock_t lock; /* protects lower_path */
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struct path lower_path;
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struct path orig_path;
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#ifdef CONFIG_SDP
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int under_knox;
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int userid;
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#define PERMISSION_PRE_ROOT 0
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#define PERMISSION_ROOT 1
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#define PERMISSION_ANDROID 2
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#define PERMISSION_UNDER_ANDROID 3
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int permission;
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appid_t appid;
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#endif
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};
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struct sdcardfs_mount_options {
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uid_t fs_low_uid;
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gid_t fs_low_gid;
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gid_t gid;
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userid_t userid;
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lower_fs_t lower_fs;
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unsigned int reserved_mb;
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mode_t mask;
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bool multi_user;
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char *label;
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type_t type;
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};
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/* sdcardfs super-block data in memory */
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struct sdcardfs_sb_info {
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struct super_block *lower_sb;
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/* derived perm policy : some of options have been added
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* to sdcardfs_mount_options (Android 4.4 support) */
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struct sdcardfs_mount_options options;
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spinlock_t lock; /* protects obbpath */
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char *obbpath_s;
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struct path obbpath;
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void *pkgl_id;
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char *devpath;
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};
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/*
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* inode to private data
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*
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* Since we use containers and the struct inode is _inside_ the
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* sdcardfs_inode_info structure, SDCARDFS_I will always (given a non-NULL
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* inode pointer), return a valid non-NULL pointer.
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*/
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static inline struct sdcardfs_inode_info *SDCARDFS_I(const struct inode *inode)
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{
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return container_of(inode, struct sdcardfs_inode_info, vfs_inode);
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}
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/* dentry to private data */
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#define SDCARDFS_D(dent) ((struct sdcardfs_dentry_info *)(dent)->d_fsdata)
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/* superblock to private data */
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#define SDCARDFS_SB(super) ((struct sdcardfs_sb_info *)(super)->s_fs_info)
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/* file to private Data */
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#define SDCARDFS_F(file) ((struct sdcardfs_file_info *)((file)->private_data))
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/* file to lower file */
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static inline struct file *sdcardfs_lower_file(const struct file *f)
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{
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return SDCARDFS_F(f)->lower_file;
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}
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static inline void sdcardfs_set_lower_file(struct file *f, struct file *val)
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{
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SDCARDFS_F(f)->lower_file = val;
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}
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/* inode to lower inode. */
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static inline struct inode *sdcardfs_lower_inode(const struct inode *i)
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{
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return SDCARDFS_I(i)->lower_inode;
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}
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static inline void sdcardfs_set_lower_inode(struct inode *i, struct inode *val)
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{
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SDCARDFS_I(i)->lower_inode = val;
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}
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/* copy the inode attrs from src to dest except uid and gid */
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static inline void sdcardfs_copy_inode_attr(struct inode *dest, const struct inode *src)
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{
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dest->i_mode = src->i_mode;
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dest->i_rdev = src->i_rdev;
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dest->i_atime = src->i_atime;
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dest->i_mtime = src->i_mtime;
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dest->i_ctime = src->i_ctime;
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dest->i_blkbits = src->i_blkbits;
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dest->i_flags = src->i_flags;
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set_nlink(dest, src->i_nlink);
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}
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/* superblock to lower superblock */
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static inline struct super_block *sdcardfs_lower_super(
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const struct super_block *sb)
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{
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return SDCARDFS_SB(sb)->lower_sb;
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}
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static inline void sdcardfs_set_lower_super(struct super_block *sb,
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struct super_block *val)
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{
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SDCARDFS_SB(sb)->lower_sb = val;
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}
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/* path based (dentry/mnt) macros */
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static inline void pathcpy(struct path *dst, const struct path *src)
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{
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dst->dentry = src->dentry;
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dst->mnt = src->mnt;
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}
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/* sdcardfs_get_pname functions calls path_get()
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* therefore, the caller must call "proper" path_put functions
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*/
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#define SDCARDFS_DENT_FUNC(pname) \
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static inline void sdcardfs_get_##pname(const struct dentry *dent, \
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struct path *pname) \
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{ \
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spin_lock(&SDCARDFS_D(dent)->lock); \
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pathcpy(pname, &SDCARDFS_D(dent)->pname); \
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path_get(pname); \
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spin_unlock(&SDCARDFS_D(dent)->lock); \
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return; \
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} \
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static inline void sdcardfs_put_##pname(const struct dentry *dent, \
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struct path *pname) \
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{ \
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path_put(pname); \
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return; \
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} \
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static inline void sdcardfs_set_##pname(const struct dentry *dent, \
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struct path *pname) \
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{ \
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spin_lock(&SDCARDFS_D(dent)->lock); \
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pathcpy(&SDCARDFS_D(dent)->pname, pname); \
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spin_unlock(&SDCARDFS_D(dent)->lock); \
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return; \
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} \
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static inline void sdcardfs_reset_##pname(const struct dentry *dent) \
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{ \
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spin_lock(&SDCARDFS_D(dent)->lock); \
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SDCARDFS_D(dent)->pname.dentry = NULL; \
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SDCARDFS_D(dent)->pname.mnt = NULL; \
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spin_unlock(&SDCARDFS_D(dent)->lock); \
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return; \
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} \
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static inline void sdcardfs_put_reset_##pname(const struct dentry *dent) \
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{ \
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struct path pname; \
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spin_lock(&SDCARDFS_D(dent)->lock); \
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if (SDCARDFS_D(dent)->pname.dentry) { \
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pathcpy(&pname, &SDCARDFS_D(dent)->pname); \
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SDCARDFS_D(dent)->pname.dentry = NULL; \
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SDCARDFS_D(dent)->pname.mnt = NULL; \
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spin_unlock(&SDCARDFS_D(dent)->lock); \
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path_put(&pname); \
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} else \
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spin_unlock(&SDCARDFS_D(dent)->lock); \
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return; \
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}
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SDCARDFS_DENT_FUNC(lower_path)
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SDCARDFS_DENT_FUNC(orig_path)
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static inline void sdcardfs_copy_lower_path(const struct dentry *dent,
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struct path *lower_path)
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{
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spin_lock(&SDCARDFS_D(dent)->lock);
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pathcpy(lower_path, &SDCARDFS_D(dent)->lower_path);
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spin_unlock(&SDCARDFS_D(dent)->lock);
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return;
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}
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static inline int has_graft_path(const struct dentry *dent)
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{
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int ret = 0;
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spin_lock(&SDCARDFS_D(dent)->lock);
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if (SDCARDFS_D(dent)->orig_path.dentry != NULL)
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ret = 1;
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spin_unlock(&SDCARDFS_D(dent)->lock);
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return ret;
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}
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static inline void sdcardfs_get_real_lower(const struct dentry *dent,
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struct path *real_lower)
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{
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/* in case of a local obb dentry
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* the orig_path should be returned
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*/
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if (has_graft_path(dent))
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sdcardfs_get_orig_path(dent, real_lower);
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else
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sdcardfs_get_lower_path(dent, real_lower);
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}
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static inline void sdcardfs_put_real_lower(const struct dentry *dent,
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struct path *real_lower)
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{
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if (has_graft_path(dent))
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sdcardfs_put_orig_path(dent, real_lower);
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else
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sdcardfs_put_lower_path(dent, real_lower);
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}
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/* for packagelist.c */
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#define STRING_BUF_SIZE (512)
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struct packagelist_data {
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DECLARE_HASHTABLE(package_to_appid,8);
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struct mutex hashtable_lock;
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struct task_struct *thread_id;
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char read_buf[STRING_BUF_SIZE];
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char event_buf[STRING_BUF_SIZE];
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char app_name_buf[STRING_BUF_SIZE];
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char gids_buf[STRING_BUF_SIZE];
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atomic_t newly_created;
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};
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extern appid_t get_appid(void *pkgl_id, const char *app_name);
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extern int check_caller_access_to_name(struct inode *parent_node, const char *name);
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extern int open_flags_to_access_mode(int open_flags);
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extern void *packagelist_create(void);
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extern void packagelist_destroy(void *pkgl_id);
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extern int packagelist_init(void);
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extern void packagelist_exit(void);
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/* for derived_perm.c */
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extern void setup_derived_state(struct inode *inode, perm_t perm,
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userid_t userid, uid_t uid, gid_t gid, bool under_android);
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extern void get_derived_permission(struct dentry *parent, struct dentry *dentry);
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extern void fix_derived_permission(struct inode *inode);
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extern void update_derived_permission(struct dentry *dentry);
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extern int need_graft_path(struct dentry *dentry);
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extern int is_base_obbpath(struct dentry *dentry);
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extern int is_obbpath_invalid(struct dentry *dentry);
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extern int setup_obb_dentry(struct dentry *dentry, struct path *lower_path);
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/* locking helpers */
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static inline struct dentry *lock_parent(struct dentry *dentry)
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{
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struct dentry *dir = dget_parent(dentry);
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mutex_lock_nested(&d_inode(dir)->i_mutex, I_MUTEX_PARENT);
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return dir;
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}
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static inline void unlock_dir(struct dentry *dir)
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{
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mutex_unlock(&d_inode(dir)->i_mutex);
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dput(dir);
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}
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static inline int prepare_dir(const char *path_s, uid_t uid, gid_t gid, mode_t mode)
|
|
{
|
|
int err;
|
|
struct dentry *dent;
|
|
struct path path;
|
|
struct iattr attrs;
|
|
|
|
dent = kern_path_create(AT_FDCWD, path_s, &path, LOOKUP_DIRECTORY);
|
|
|
|
if (IS_ERR(dent)) {
|
|
err = PTR_ERR(dent);
|
|
if (err == -EEXIST)
|
|
err = 0;
|
|
return err;
|
|
}
|
|
|
|
err = mnt_want_write(path.mnt);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = vfs_mkdir(d_inode(path.dentry), dent, mode);
|
|
if (err) {
|
|
if (err == -EEXIST)
|
|
err = 0;
|
|
goto out_drop;
|
|
}
|
|
|
|
attrs.ia_uid = make_kuid(current_user_ns(), uid);
|
|
attrs.ia_gid = make_kgid(current_user_ns(), gid);
|
|
attrs.ia_valid = ATTR_UID | ATTR_GID;
|
|
mutex_lock(&d_inode(dent)->i_mutex);
|
|
notify_change(dent, &attrs, NULL);
|
|
mutex_unlock(&d_inode(dent)->i_mutex);
|
|
|
|
out_drop:
|
|
mnt_drop_write(path.mnt);
|
|
|
|
out:
|
|
dput(dent);
|
|
/* parent dentry locked by kern_path_create */
|
|
mutex_unlock(&d_inode(path.dentry)->i_mutex);
|
|
path_put(&path);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Return 1, if a disk has enough free space, otherwise 0.
|
|
* We assume that any files can not be overwritten.
|
|
*/
|
|
static inline int check_min_free_space(struct dentry *dentry, size_t size, int dir)
|
|
{
|
|
int err;
|
|
struct path lower_path;
|
|
struct kstatfs statfs;
|
|
u64 avail;
|
|
struct sdcardfs_sb_info *sbi = SDCARDFS_SB(dentry->d_sb);
|
|
|
|
if (sbi->options.reserved_mb) {
|
|
/* Get fs stat of lower filesystem. */
|
|
sdcardfs_get_lower_path(dentry, &lower_path);
|
|
err = vfs_statfs(&lower_path, &statfs);
|
|
sdcardfs_put_lower_path(dentry, &lower_path);
|
|
|
|
if (unlikely(err))
|
|
goto out_invalid;
|
|
|
|
/* Invalid statfs informations. */
|
|
if (unlikely(statfs.f_bsize == 0))
|
|
goto out_invalid;
|
|
|
|
/* if you are checking directory, set size to f_bsize. */
|
|
if (unlikely(dir))
|
|
size = statfs.f_bsize;
|
|
|
|
/* available size */
|
|
avail = statfs.f_bavail * statfs.f_bsize;
|
|
|
|
/* not enough space */
|
|
if ((u64)size > avail)
|
|
goto out_nospc;
|
|
|
|
/* enough space */
|
|
if ((avail - size) > (sbi->options.reserved_mb * 1024 * 1024))
|
|
return 1;
|
|
goto out_nospc;
|
|
} else
|
|
return 1;
|
|
|
|
out_invalid:
|
|
printk(KERN_INFO "statfs : invalid return\n");
|
|
printk(KERN_INFO "vfs_statfs error# : %d\n", err);
|
|
printk(KERN_INFO "statfs.f_type : 0x%X\n", (u32)statfs.f_type);
|
|
printk(KERN_INFO "statfs.f_blocks : %llu blocks\n", statfs.f_blocks);
|
|
printk(KERN_INFO "statfs.f_bfree : %llu blocks\n", statfs.f_bfree);
|
|
printk(KERN_INFO "statfs.f_files : %llu\n", statfs.f_files);
|
|
printk(KERN_INFO "statfs.f_ffree : %llu\n", statfs.f_ffree);
|
|
printk(KERN_INFO "statfs.f_fsid.val[1] : 0x%X\n", (u32)statfs.f_fsid.val[1]);
|
|
printk(KERN_INFO "statfs.f_fsid.val[0] : 0x%X\n", (u32)statfs.f_fsid.val[0]);
|
|
printk(KERN_INFO "statfs.f_namelen : %ld\n", statfs.f_namelen);
|
|
printk(KERN_INFO "statfs.f_frsize : %ld\n", statfs.f_frsize);
|
|
printk(KERN_INFO "statfs.f_flags : %ld\n", statfs.f_flags);
|
|
printk(KERN_INFO "sdcardfs reserved_mb : %u\n", sbi->options.reserved_mb);
|
|
if (sbi->devpath)
|
|
printk(KERN_INFO "sdcardfs source path : %s\n", sbi->devpath);
|
|
|
|
out_nospc:
|
|
printk_ratelimited(KERN_INFO "statfs.f_bavail : %llu blocks / "
|
|
"statfs.f_bsize : %ld bytes / "
|
|
"required size : %llu byte\n"
|
|
, statfs.f_bavail, statfs.f_bsize, (u64)size);
|
|
return 0;
|
|
}
|
|
|
|
static inline bool str_case_eq(const char *s1, const char *s2)
|
|
{
|
|
return !strcasecmp(s1, s2);
|
|
}
|
|
|
|
static inline bool str_n_case_eq(const char *s1, const char *s2, size_t len)
|
|
{
|
|
return !strncasecmp(s1, s2, len);
|
|
}
|
|
|
|
static inline bool qstr_case_eq(const struct qstr *q1, const struct qstr *q2)
|
|
{
|
|
return q1->len == q2->len && str_n_case_eq(q1->name, q2->name, q1->len);
|
|
}
|
|
|
|
#define QSTR_LITERAL(string) QSTR_INIT(string, sizeof(string)-1)
|
|
|
|
#endif /* not _SDCARDFS_H_ */
|