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Commit e8c67fbb authored by Martijn Coenen's avatar Martijn Coenen
Browse files

BACKPORT: loop: Move loop_set_status_from_info() and friends up 



So we can use it without forward declaration. This is a separate commit
to make it easier to verify that this is just a move, without functional
modifications.

Signed-off-by: default avatarMartijn Coenen <maco@android.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
(cherry picked from commit 62ab466ca881fe200c21aa74b65f8bd83ec482dc)
Bug: 148607611
Change-Id: I8c68ebbe65cbec476f9f2d4c1d60eb343e88bb56
parent 24627fb3

drivers/block/loop.c

+103 −103
Original line number Diff line number Diff line
@@ -883,6 +883,109 @@ static int loop_prepare_queue(struct loop_device *lo) 
	return 0;

}



static int

loop_release_xfer(struct loop_device *lo)

{

	int err = 0;

	struct loop_func_table *xfer = lo->lo_encryption;



	if (xfer) {

		if (xfer->release)

			err = xfer->release(lo);

		lo->transfer = NULL;

		lo->lo_encryption = NULL;

		module_put(xfer->owner);

	}

	return err;

}



static int

loop_init_xfer(struct loop_device *lo, struct loop_func_table *xfer,

	       const struct loop_info64 *i)

{

	int err = 0;



	if (xfer) {

		struct module *owner = xfer->owner;



		if (!try_module_get(owner))

			return -EINVAL;

		if (xfer->init)

			err = xfer->init(lo, i);

		if (err)

			module_put(owner);

		else

			lo->lo_encryption = xfer;

	}

	return err;

}



/**

 * loop_set_status_from_info - configure device from loop_info

 * @lo: struct loop_device to configure

 * @info: struct loop_info64 to configure the device with

 *

 * Configures the loop device parameters according to the passed

 * in loop_info64 configuration.

 */

static int

loop_set_status_from_info(struct loop_device *lo,

			  const struct loop_info64 *info)

{

	int err;

	struct loop_func_table *xfer;

	kuid_t uid = current_uid();



	if ((unsigned int) info->lo_encrypt_key_size > LO_KEY_SIZE)

		return -EINVAL;



	err = loop_release_xfer(lo);

	if (err)

		return err;



	if (info->lo_encrypt_type) {

		unsigned int type = info->lo_encrypt_type;



		if (type >= MAX_LO_CRYPT)

			return -EINVAL;

		xfer = xfer_funcs[type];

		if (xfer == NULL)

			return -EINVAL;

	} else

		xfer = NULL;



	err = loop_init_xfer(lo, xfer, info);

	if (err)

		return err;



	lo->lo_offset = info->lo_offset;

	lo->lo_sizelimit = info->lo_sizelimit;

	memcpy(lo->lo_file_name, info->lo_file_name, LO_NAME_SIZE);

	memcpy(lo->lo_crypt_name, info->lo_crypt_name, LO_NAME_SIZE);

	lo->lo_file_name[LO_NAME_SIZE-1] = 0;

	lo->lo_crypt_name[LO_NAME_SIZE-1] = 0;



	if (!xfer)

		xfer = &none_funcs;

	lo->transfer = xfer->transfer;

	lo->ioctl = xfer->ioctl;



	if ((lo->lo_flags & LO_FLAGS_AUTOCLEAR) !=

	     (info->lo_flags & LO_FLAGS_AUTOCLEAR))

		lo->lo_flags ^= LO_FLAGS_AUTOCLEAR;



	lo->lo_encrypt_key_size = info->lo_encrypt_key_size;

	lo->lo_init[0] = info->lo_init[0];

	lo->lo_init[1] = info->lo_init[1];

	if (info->lo_encrypt_key_size) {

		memcpy(lo->lo_encrypt_key, info->lo_encrypt_key,

		       info->lo_encrypt_key_size);

		lo->lo_key_owner = uid;

	}



	return 0;

}



static int loop_set_fd(struct loop_device *lo, fmode_t mode,

		       struct block_device *bdev, unsigned int arg)

{
@@ -978,43 +1081,6 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, 
	return error;

}



static int

loop_release_xfer(struct loop_device *lo)

{

	int err = 0;

	struct loop_func_table *xfer = lo->lo_encryption;



	if (xfer) {

		if (xfer->release)

			err = xfer->release(lo);

		lo->transfer = NULL;

		lo->lo_encryption = NULL;

		module_put(xfer->owner);

	}

	return err;

}



static int

loop_init_xfer(struct loop_device *lo, struct loop_func_table *xfer,

	       const struct loop_info64 *i)

{

	int err = 0;



	if (xfer) {

		struct module *owner = xfer->owner;



		if (!try_module_get(owner))

			return -EINVAL;

		if (xfer->init)

			err = xfer->init(lo, i);

		if (err)

			module_put(owner);

		else

			lo->lo_encryption = xfer;

	}

	return err;

}



static int loop_clr_fd(struct loop_device *lo)

{

	struct file *filp = lo->lo_backing_file;
@@ -1097,72 +1163,6 @@ static int loop_clr_fd(struct loop_device *lo) 
	return 0;

}



/**

 * loop_set_status_from_info - configure device from loop_info

 * @lo: struct loop_device to configure

 * @info: struct loop_info64 to configure the device with

 *

 * Configures the loop device parameters according to the passed

 * in loop_info64 configuration.

 */

static int

loop_set_status_from_info(struct loop_device *lo,

			  const struct loop_info64 *info)

{

	int err;

	struct loop_func_table *xfer;

	kuid_t uid = current_uid();



	if ((unsigned int) info->lo_encrypt_key_size > LO_KEY_SIZE)

		return -EINVAL;



	err = loop_release_xfer(lo);

	if (err)

		return err;



	if (info->lo_encrypt_type) {

		unsigned int type = info->lo_encrypt_type;



		if (type >= MAX_LO_CRYPT)

			return -EINVAL;

		xfer = xfer_funcs[type];

		if (xfer == NULL)

			return -EINVAL;

	} else

		xfer = NULL;



	err = loop_init_xfer(lo, xfer, info);

	if (err)

		return err;



	lo->lo_offset = info->lo_offset;

	lo->lo_sizelimit = info->lo_sizelimit;

	memcpy(lo->lo_file_name, info->lo_file_name, LO_NAME_SIZE);

	memcpy(lo->lo_crypt_name, info->lo_crypt_name, LO_NAME_SIZE);

	lo->lo_file_name[LO_NAME_SIZE-1] = 0;

	lo->lo_crypt_name[LO_NAME_SIZE-1] = 0;



	if (!xfer)

		xfer = &none_funcs;

	lo->transfer = xfer->transfer;

	lo->ioctl = xfer->ioctl;



	if ((lo->lo_flags & LO_FLAGS_AUTOCLEAR) !=

	     (info->lo_flags & LO_FLAGS_AUTOCLEAR))

		lo->lo_flags ^= LO_FLAGS_AUTOCLEAR;



	lo->lo_encrypt_key_size = info->lo_encrypt_key_size;

	lo->lo_init[0] = info->lo_init[0];

	lo->lo_init[1] = info->lo_init[1];

	if (info->lo_encrypt_key_size) {

		memcpy(lo->lo_encrypt_key, info->lo_encrypt_key,

		       info->lo_encrypt_key_size);

		lo->lo_key_owner = uid;

	}



	return 0;

}



static int

loop_set_status(struct loop_device *lo, const struct loop_info64 *info)

{