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lightnvm: introduce factory reset

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Now that a device can be managed using the system blocks, a method to
reset the device is necessary as well. This patch introduces logic to
reset the device easily to factory state and exposes it through an
ioctl.

The ioctl takes the following flags:

  NVM_FACTORY_ERASE_ONLY_USER
      By default all blocks, except host-reserved blocks are erased upon
      factory reset. Instead of this, only erase host-reserved blocks.
  NVM_FACTORY_RESET_HOST_BLKS
      Mark host-reserved blocks to be erased and set their type to free.
  NVM_FACTORY_RESET_GRWN_BBLKS
      Mark "grown bad blocks" to be erased and set their type to free.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Matias Bjørling 2016-01-12 07:49:39 +01:00 • committed by Jens Axboe
parent b769207678
commit 8b4970c41f
4 changed files with 234 additions and 0 deletions
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2
include/linux/lightnvm.h
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@ -527,6 +527,8 @@ struct nvm_system_block {
extern int nvm_get_sysblock(struct nvm_dev *, struct nvm_sb_info *);
extern int nvm_update_sysblock(struct nvm_dev *, struct nvm_sb_info *);
extern int nvm_init_sysblock(struct nvm_dev *, struct nvm_sb_info *);
extern int nvm_dev_factory(struct nvm_dev *, int flags);
#else /* CONFIG_NVM */
struct nvm_dev_ops;