diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/md/dm-linear.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/md/dm-linear.c | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/ANDROID_3.4.5/drivers/md/dm-linear.c b/ANDROID_3.4.5/drivers/md/dm-linear.c deleted file mode 100644 index 3639eeab..00000000 --- a/ANDROID_3.4.5/drivers/md/dm-linear.c +++ /dev/null @@ -1,182 +0,0 @@ -/* - * Copyright (C) 2001-2003 Sistina Software (UK) Limited. - * - * This file is released under the GPL. - */ - -#include "dm.h" -#include <linux/module.h> -#include <linux/init.h> -#include <linux/blkdev.h> -#include <linux/bio.h> -#include <linux/slab.h> -#include <linux/device-mapper.h> - -#define DM_MSG_PREFIX "linear" - -/* - * Linear: maps a linear range of a device. - */ -struct linear_c { - struct dm_dev *dev; - sector_t start; -}; - -/* - * Construct a linear mapping: <dev_path> <offset> - */ -static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv) -{ - struct linear_c *lc; - unsigned long long tmp; - char dummy; - - if (argc != 2) { - ti->error = "Invalid argument count"; - return -EINVAL; - } - - lc = kmalloc(sizeof(*lc), GFP_KERNEL); - if (lc == NULL) { - ti->error = "dm-linear: Cannot allocate linear context"; - return -ENOMEM; - } - - if (sscanf(argv[1], "%llu%c", &tmp, &dummy) != 1) { - ti->error = "dm-linear: Invalid device sector"; - goto bad; - } - lc->start = tmp; - - if (dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &lc->dev)) { - ti->error = "dm-linear: Device lookup failed"; - goto bad; - } - - ti->num_flush_requests = 1; - ti->num_discard_requests = 1; - ti->private = lc; - return 0; - - bad: - kfree(lc); - return -EINVAL; -} - -static void linear_dtr(struct dm_target *ti) -{ - struct linear_c *lc = (struct linear_c *) ti->private; - - dm_put_device(ti, lc->dev); - kfree(lc); -} - -static sector_t linear_map_sector(struct dm_target *ti, sector_t bi_sector) -{ - struct linear_c *lc = ti->private; - - return lc->start + dm_target_offset(ti, bi_sector); -} - -static void linear_map_bio(struct dm_target *ti, struct bio *bio) -{ - struct linear_c *lc = ti->private; - - bio->bi_bdev = lc->dev->bdev; - if (bio_sectors(bio)) - bio->bi_sector = linear_map_sector(ti, bio->bi_sector); -} - -static int linear_map(struct dm_target *ti, struct bio *bio, - union map_info *map_context) -{ - linear_map_bio(ti, bio); - - return DM_MAPIO_REMAPPED; -} - -static int linear_status(struct dm_target *ti, status_type_t type, - char *result, unsigned int maxlen) -{ - struct linear_c *lc = (struct linear_c *) ti->private; - - switch (type) { - case STATUSTYPE_INFO: - result[0] = '\0'; - break; - - case STATUSTYPE_TABLE: - snprintf(result, maxlen, "%s %llu", lc->dev->name, - (unsigned long long)lc->start); - break; - } - return 0; -} - -static int linear_ioctl(struct dm_target *ti, unsigned int cmd, - unsigned long arg) -{ - struct linear_c *lc = (struct linear_c *) ti->private; - struct dm_dev *dev = lc->dev; - int r = 0; - - /* - * Only pass ioctls through if the device sizes match exactly. - */ - if (lc->start || - ti->len != i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT) - r = scsi_verify_blk_ioctl(NULL, cmd); - - return r ? : __blkdev_driver_ioctl(dev->bdev, dev->mode, cmd, arg); -} - -static int linear_merge(struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct linear_c *lc = ti->private; - struct request_queue *q = bdev_get_queue(lc->dev->bdev); - - if (!q->merge_bvec_fn) - return max_size; - - bvm->bi_bdev = lc->dev->bdev; - bvm->bi_sector = linear_map_sector(ti, bvm->bi_sector); - - return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); -} - -static int linear_iterate_devices(struct dm_target *ti, - iterate_devices_callout_fn fn, void *data) -{ - struct linear_c *lc = ti->private; - - return fn(ti, lc->dev, lc->start, ti->len, data); -} - -static struct target_type linear_target = { - .name = "linear", - .version = {1, 1, 0}, - .module = THIS_MODULE, - .ctr = linear_ctr, - .dtr = linear_dtr, - .map = linear_map, - .status = linear_status, - .ioctl = linear_ioctl, - .merge = linear_merge, - .iterate_devices = linear_iterate_devices, -}; - -int __init dm_linear_init(void) -{ - int r = dm_register_target(&linear_target); - - if (r < 0) - DMERR("register failed %d", r); - - return r; -} - -void dm_linear_exit(void) -{ - dm_unregister_target(&linear_target); -} |