kernel/power/tuxonice_bio_internal.h

   1 /*
   2  * kernel/power/tuxonice_bio_internal.h
   3  *
   4  * Copyright (C) 2009-2010 Nigel Cunningham (nigel at tuxonice net)
   5  *
   6  * Distributed under GPLv2.
   7  *
   8  * This file contains declarations for functions exported from
   9  * tuxonice_bio.c, which contains low level io functions.
  10  */
  11
  12 /* Extent chains */
  13 void toi_extent_state_goto_start(void);
  14 void toi_extent_state_save(int slot);
  15 int go_next_page(int writing, int section_barrier);
  16 void toi_extent_state_restore(int slot);
  17 void free_all_bdev_info(void);
  18 int devices_of_same_priority(struct toi_bdev_info *this);
  19 int toi_register_storage_chain(struct toi_bdev_info *new);
  20 int toi_serialise_extent_chains(void);
  21 int toi_load_extent_chains(void);
  22 int toi_bio_rw_page(int writing, struct page *page, int is_readahead, int free_group);
  23 int toi_bio_restore_original_signature(void);
  24 int toi_bio_devinfo_storage_needed(void);
  25 unsigned long get_headerblock(void);
  26 dev_t get_header_dev_t(void);
  27 struct block_device *get_header_bdev(void);
  28 int toi_bio_allocate_storage(unsigned long request);
  29
  30 /* Signature functions */
  31 #define HaveImage "HaveImage"
  32 #define NoImage "TuxOnIce"
  33 #define sig_size (sizeof(HaveImage))
  34
  35 struct sig_data {
  36         char sig[sig_size];
  37         int have_image;
  38         int resumed_before;
  39
  40         char have_uuid;
  41         char header_uuid[17];
  42         dev_t header_dev_t;
  43         unsigned long first_header_block;
  44
  45         /* Repeat the signature to be sure we have a header version */
  46         char sig2[sig_size];
  47         int header_version;
  48 };
  49
  50 void forget_signature_page(void);
  51 int toi_check_for_signature(void);
  52 int toi_bio_image_exists(int quiet);
  53 int get_signature_page(void);
  54 int toi_bio_mark_resume_attempted(int);
  55 extern char *toi_cur_sig_page;
  56 extern char *toi_orig_sig_page;
  57 int toi_bio_mark_have_image(void);
  58 extern struct sig_data *toi_sig_data;
  59 extern dev_t resume_dev_t;
  60 extern struct block_device *resume_block_device;
  61 extern struct block_device *header_block_device;
  62 extern unsigned long resume_firstblock;
  63
  64 struct block_device *open_bdev(dev_t device, int display_errs);
  65 extern int current_stream;
  66 extern int more_readahead;
  67 int toi_do_io(int writing, struct block_device *bdev, long block0,
  68               struct page *page, int is_readahead, int syncio, int free_group);
  69 int get_main_pool_phys_params(void);
  70
  71 void toi_close_bdev(struct block_device *bdev);
  72 struct block_device *toi_open_bdev(char *uuid, dev_t default_device, int display_errs);
  73
  74 extern struct toi_module_ops toi_blockwriter_ops;
  75 void dump_block_chains(void);
  76 void debug_broken_header(void);
  77 extern unsigned long raw_pages_allocd, header_pages_reserved;
  78 int toi_bio_chains_debug_info(char *buffer, int size);
  79 void toi_bio_chains_post_atomic(struct toi_boot_kernel_data *bkd);
  80 int toi_bio_scan_for_image(int quiet);
  81 int toi_bio_get_header_version(void);
  82
  83 void close_resume_dev_t(int force);
  84 int open_resume_dev_t(int force, int quiet);