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[PATCH] BLOCK: Move the loop device ioctl compat stuff to the loop driver [try #6]
Move the loop device ioctl compat stuff from fs/compat_ioctl.c to the loop driver so that the loop header file doesn't need to be included. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
David Howells
Jens Axboe
parent
b71e8a4ce0
commit
863d5b822c
@ -66,6 +66,7 @@
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#include <linux/swap.h>
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#include <linux/slab.h>
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#include <linux/loop.h>
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#include <linux/compat.h>
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#include <linux/suspend.h>
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#include <linux/writeback.h>
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#include <linux/buffer_head.h> /* for invalidate_bdev() */
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@ -1165,6 +1166,162 @@ static int lo_ioctl(struct inode * inode, struct file * file,
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return err;
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}
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#ifdef CONFIG_COMPAT
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struct compat_loop_info {
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compat_int_t lo_number; /* ioctl r/o */
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compat_dev_t lo_device; /* ioctl r/o */
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compat_ulong_t lo_inode; /* ioctl r/o */
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compat_dev_t lo_rdevice; /* ioctl r/o */
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compat_int_t lo_offset;
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compat_int_t lo_encrypt_type;
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compat_int_t lo_encrypt_key_size; /* ioctl w/o */
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compat_int_t lo_flags; /* ioctl r/o */
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char lo_name[LO_NAME_SIZE];
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unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
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compat_ulong_t lo_init[2];
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char reserved[4];
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};
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/*
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* Transfer 32-bit compatibility structure in userspace to 64-bit loop info
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* - noinlined to reduce stack space usage in main part of driver
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*/
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static noinline int
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loop_info64_from_compat(const struct compat_loop_info *arg,
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struct loop_info64 *info64)
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{
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struct compat_loop_info info;
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if (copy_from_user(&info, arg, sizeof(info)))
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return -EFAULT;
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memset(info64, 0, sizeof(*info64));
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info64->lo_number = info.lo_number;
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info64->lo_device = info.lo_device;
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info64->lo_inode = info.lo_inode;
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info64->lo_rdevice = info.lo_rdevice;
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info64->lo_offset = info.lo_offset;
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info64->lo_sizelimit = 0;
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info64->lo_encrypt_type = info.lo_encrypt_type;
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info64->lo_encrypt_key_size = info.lo_encrypt_key_size;
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info64->lo_flags = info.lo_flags;
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info64->lo_init[0] = info.lo_init[0];
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info64->lo_init[1] = info.lo_init[1];
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if (info.lo_encrypt_type == LO_CRYPT_CRYPTOAPI)
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memcpy(info64->lo_crypt_name, info.lo_name, LO_NAME_SIZE);
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else
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memcpy(info64->lo_file_name, info.lo_name, LO_NAME_SIZE);
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memcpy(info64->lo_encrypt_key, info.lo_encrypt_key, LO_KEY_SIZE);
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return 0;
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}
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/*
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* Transfer 64-bit loop info to 32-bit compatibility structure in userspace
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* - noinlined to reduce stack space usage in main part of driver
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*/
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static noinline int
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loop_info64_to_compat(const struct loop_info64 *info64,
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struct compat_loop_info __user *arg)
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{
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struct compat_loop_info info;
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memset(&info, 0, sizeof(info));
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info.lo_number = info64->lo_number;
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info.lo_device = info64->lo_device;
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info.lo_inode = info64->lo_inode;
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info.lo_rdevice = info64->lo_rdevice;
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info.lo_offset = info64->lo_offset;
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info.lo_encrypt_type = info64->lo_encrypt_type;
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info.lo_encrypt_key_size = info64->lo_encrypt_key_size;
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info.lo_flags = info64->lo_flags;
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info.lo_init[0] = info64->lo_init[0];
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info.lo_init[1] = info64->lo_init[1];
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if (info.lo_encrypt_type == LO_CRYPT_CRYPTOAPI)
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memcpy(info.lo_name, info64->lo_crypt_name, LO_NAME_SIZE);
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else
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memcpy(info.lo_name, info64->lo_file_name, LO_NAME_SIZE);
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memcpy(info.lo_encrypt_key, info64->lo_encrypt_key, LO_KEY_SIZE);
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/* error in case values were truncated */
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if (info.lo_device != info64->lo_device ||
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info.lo_rdevice != info64->lo_rdevice ||
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info.lo_inode != info64->lo_inode ||
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info.lo_offset != info64->lo_offset ||
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info.lo_init[0] != info64->lo_init[0] ||
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info.lo_init[1] != info64->lo_init[1])
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return -EOVERFLOW;
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if (copy_to_user(arg, &info, sizeof(info)))
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return -EFAULT;
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return 0;
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}
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static int
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loop_set_status_compat(struct loop_device *lo,
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const struct compat_loop_info __user *arg)
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{
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struct loop_info64 info64;
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int ret;
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ret = loop_info64_from_compat(arg, &info64);
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if (ret < 0)
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return ret;
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return loop_set_status(lo, &info64);
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}
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static int
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loop_get_status_compat(struct loop_device *lo,
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struct compat_loop_info __user *arg)
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{
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struct loop_info64 info64;
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int err = 0;
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if (!arg)
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err = -EINVAL;
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if (!err)
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err = loop_get_status(lo, &info64);
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if (!err)
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err = loop_info64_to_compat(&info64, arg);
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return err;
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}
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static long lo_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct inode *inode = file->f_dentry->d_inode;
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struct loop_device *lo = inode->i_bdev->bd_disk->private_data;
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int err;
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lock_kernel();
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switch(cmd) {
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case LOOP_SET_STATUS:
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mutex_lock(&lo->lo_ctl_mutex);
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err = loop_set_status_compat(
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lo, (const struct compat_loop_info __user *) arg);
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mutex_unlock(&lo->lo_ctl_mutex);
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break;
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case LOOP_GET_STATUS:
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mutex_lock(&lo->lo_ctl_mutex);
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err = loop_get_status_compat(
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lo, (struct compat_loop_info __user *) arg);
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mutex_unlock(&lo->lo_ctl_mutex);
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break;
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case LOOP_CLR_FD:
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case LOOP_GET_STATUS64:
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case LOOP_SET_STATUS64:
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arg = (unsigned long) compat_ptr(arg);
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case LOOP_SET_FD:
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case LOOP_CHANGE_FD:
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err = lo_ioctl(inode, file, cmd, arg);
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break;
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default:
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err = -ENOIOCTLCMD;
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break;
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}
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unlock_kernel();
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return err;
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}
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#endif
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static int lo_open(struct inode *inode, struct file *file)
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{
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struct loop_device *lo = inode->i_bdev->bd_disk->private_data;
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@ -1192,6 +1349,9 @@ static struct block_device_operations lo_fops = {
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.open = lo_open,
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.release = lo_release,
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.ioctl = lo_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = lo_compat_ioctl,
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#endif
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};
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/*
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@ -40,7 +40,6 @@
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#include <linux/if_pppox.h>
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#include <linux/mtio.h>
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#include <linux/cdrom.h>
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#include <linux/loop.h>
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#include <linux/auto_fs.h>
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#include <linux/auto_fs4.h>
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#include <linux/tty.h>
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@ -1214,71 +1213,6 @@ static int cdrom_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long ar
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return err;
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}
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struct loop_info32 {
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compat_int_t lo_number; /* ioctl r/o */
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compat_dev_t lo_device; /* ioctl r/o */
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compat_ulong_t lo_inode; /* ioctl r/o */
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compat_dev_t lo_rdevice; /* ioctl r/o */
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compat_int_t lo_offset;
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compat_int_t lo_encrypt_type;
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compat_int_t lo_encrypt_key_size; /* ioctl w/o */
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compat_int_t lo_flags; /* ioctl r/o */
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char lo_name[LO_NAME_SIZE];
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unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
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compat_ulong_t lo_init[2];
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char reserved[4];
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};
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static int loop_status(unsigned int fd, unsigned int cmd, unsigned long arg)
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{
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mm_segment_t old_fs = get_fs();
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struct loop_info l;
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struct loop_info32 __user *ul;
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int err = -EINVAL;
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ul = compat_ptr(arg);
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switch(cmd) {
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case LOOP_SET_STATUS:
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err = get_user(l.lo_number, &ul->lo_number);
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err |= __get_user(l.lo_device, &ul->lo_device);
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err |= __get_user(l.lo_inode, &ul->lo_inode);
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err |= __get_user(l.lo_rdevice, &ul->lo_rdevice);
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err |= __copy_from_user(&l.lo_offset, &ul->lo_offset,
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8 + (unsigned long)l.lo_init - (unsigned long)&l.lo_offset);
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if (err) {
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err = -EFAULT;
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} else {
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set_fs (KERNEL_DS);
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err = sys_ioctl (fd, cmd, (unsigned long)&l);
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set_fs (old_fs);
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}
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break;
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case LOOP_GET_STATUS:
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set_fs (KERNEL_DS);
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err = sys_ioctl (fd, cmd, (unsigned long)&l);
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set_fs (old_fs);
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if (!err) {
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err = put_user(l.lo_number, &ul->lo_number);
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err |= __put_user(l.lo_device, &ul->lo_device);
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err |= __put_user(l.lo_inode, &ul->lo_inode);
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err |= __put_user(l.lo_rdevice, &ul->lo_rdevice);
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err |= __copy_to_user(&ul->lo_offset, &l.lo_offset,
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(unsigned long)l.lo_init - (unsigned long)&l.lo_offset);
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if (err)
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err = -EFAULT;
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}
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break;
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default: {
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static int count;
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if (++count <= 20)
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printk("%s: Unknown loop ioctl cmd, fd(%d) "
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"cmd(%08x) arg(%08lx)\n",
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__FUNCTION__, fd, cmd, arg);
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}
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}
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return err;
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}
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#ifdef CONFIG_VT
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static int vt_check(struct file *file)
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@ -2808,8 +2742,6 @@ HANDLE_IOCTL(MTIOCGET32, mt_ioctl_trans)
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HANDLE_IOCTL(MTIOCPOS32, mt_ioctl_trans)
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HANDLE_IOCTL(CDROMREADAUDIO, cdrom_ioctl_trans)
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HANDLE_IOCTL(CDROM_SEND_PACKET, cdrom_ioctl_trans)
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HANDLE_IOCTL(LOOP_SET_STATUS, loop_status)
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HANDLE_IOCTL(LOOP_GET_STATUS, loop_status)
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#define AUTOFS_IOC_SETTIMEOUT32 _IOWR(0x93,0x64,unsigned int)
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HANDLE_IOCTL(AUTOFS_IOC_SETTIMEOUT32, ioc_settimeout)
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#ifdef CONFIG_VT
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@ -395,12 +395,6 @@ COMPATIBLE_IOCTL(DVD_WRITE_STRUCT)
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COMPATIBLE_IOCTL(DVD_AUTH)
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/* pktcdvd */
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COMPATIBLE_IOCTL(PACKET_CTRL_CMD)
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/* Big L */
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ULONG_IOCTL(LOOP_SET_FD)
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ULONG_IOCTL(LOOP_CHANGE_FD)
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COMPATIBLE_IOCTL(LOOP_CLR_FD)
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COMPATIBLE_IOCTL(LOOP_GET_STATUS64)
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COMPATIBLE_IOCTL(LOOP_SET_STATUS64)
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/* Big A */
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/* sparc only */
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/* Big Q for sound/OSS */
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