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Diffstat (limited to 'kernel/power/tuxonice_bio_chains.c')
-rw-r--r--kernel/power/tuxonice_bio_chains.c1126
1 files changed, 0 insertions, 1126 deletions
diff --git a/kernel/power/tuxonice_bio_chains.c b/kernel/power/tuxonice_bio_chains.c
deleted file mode 100644
index 364fae9db..000000000
--- a/kernel/power/tuxonice_bio_chains.c
+++ /dev/null
@@ -1,1126 +0,0 @@
-/*
- * kernel/power/tuxonice_bio_devinfo.c
- *
- * Copyright (C) 2009-2015 Nigel Cunningham (nigel at nigelcunningham com au)
- *
- * Distributed under GPLv2.
- *
- */
-
-#include <linux/mm_types.h>
-#include "tuxonice_bio.h"
-#include "tuxonice_bio_internal.h"
-#include "tuxonice_alloc.h"
-#include "tuxonice_ui.h"
-#include "tuxonice.h"
-#include "tuxonice_io.h"
-
-static struct toi_bdev_info *prio_chain_head;
-static int num_chains;
-
-/* Pointer to current entry being loaded/saved. */
-struct toi_extent_iterate_state toi_writer_posn;
-
-#define metadata_size (sizeof(struct toi_bdev_info) - \
- offsetof(struct toi_bdev_info, uuid))
-
-/*
- * After section 0 (header) comes 2 => next_section[0] = 2
- */
-static int next_section[3] = { 2, 3, 1 };
-
-/**
- * dump_block_chains - print the contents of the bdev info array.
- **/
-void dump_block_chains(void)
-{
- int i = 0;
- int j;
- struct toi_bdev_info *cur_chain = prio_chain_head;
-
- while (cur_chain) {
- struct hibernate_extent *this = cur_chain->blocks.first;
-
- printk(KERN_DEBUG "Chain %d (prio %d):", i, cur_chain->prio);
-
- while (this) {
- printk(KERN_CONT " [%lu-%lu]%s", this->start,
- this->end, this->next ? "," : "");
- this = this->next;
- }
-
- printk("\n");
- cur_chain = cur_chain->next;
- i++;
- }
-
- printk(KERN_DEBUG "Saved states:\n");
- for (i = 0; i < 4; i++) {
- printk(KERN_DEBUG "Slot %d: Chain %d.\n",
- i, toi_writer_posn.saved_chain_number[i]);
-
- cur_chain = prio_chain_head;
- j = 0;
- while (cur_chain) {
- printk(KERN_DEBUG " Chain %d: Extent %d. Offset %lu.\n",
- j, cur_chain->saved_state[i].extent_num,
- cur_chain->saved_state[i].offset);
- cur_chain = cur_chain->next;
- j++;
- }
- printk(KERN_CONT "\n");
- }
-}
-
-/**
- *
- **/
-static void toi_extent_chain_next(void)
-{
- struct toi_bdev_info *this = toi_writer_posn.current_chain;
-
- if (!this->blocks.current_extent)
- return;
-
- if (this->blocks.current_offset == this->blocks.current_extent->end) {
- if (this->blocks.current_extent->next) {
- this->blocks.current_extent =
- this->blocks.current_extent->next;
- this->blocks.current_offset =
- this->blocks.current_extent->start;
- } else {
- this->blocks.current_extent = NULL;
- this->blocks.current_offset = 0;
- }
- } else
- this->blocks.current_offset++;
-}
-
-/**
- *
- */
-
-static struct toi_bdev_info *__find_next_chain_same_prio(void)
-{
- struct toi_bdev_info *start_chain = toi_writer_posn.current_chain;
- struct toi_bdev_info *this = start_chain;
- int orig_prio = this->prio;
-
- do {
- this = this->next;
-
- if (!this)
- this = prio_chain_head;
-
- /* Back on original chain? Use it again. */
- if (this == start_chain)
- return start_chain;
-
- } while (!this->blocks.current_extent || this->prio != orig_prio);
-
- return this;
-}
-
-static void find_next_chain(void)
-{
- struct toi_bdev_info *this;
-
- this = __find_next_chain_same_prio();
-
- /*
- * If we didn't get another chain of the same priority that we
- * can use, look for the next priority.
- */
- while (this && !this->blocks.current_extent)
- this = this->next;
-
- toi_writer_posn.current_chain = this;
-}
-
-/**
- * toi_extent_state_next - go to the next extent
- * @blocks: The number of values to progress.
- * @stripe_mode: Whether to spread usage across all chains.
- *
- * Given a state, progress to the next valid entry. We may begin in an
- * invalid state, as we do when invoked after extent_state_goto_start below.
- *
- * When using compression and expected_compression > 0, we let the image size
- * be larger than storage, so we can validly run out of data to return.
- **/
-static unsigned long toi_extent_state_next(int blocks, int current_stream)
-{
- int i;
-
- if (!toi_writer_posn.current_chain)
- return -ENOSPC;
-
- /* Assume chains always have lengths that are multiples of @blocks */
- for (i = 0; i < blocks; i++)
- toi_extent_chain_next();
-
- /* The header stream is not striped */
- if (current_stream ||
- !toi_writer_posn.current_chain->blocks.current_extent)
- find_next_chain();
-
- return toi_writer_posn.current_chain ? 0 : -ENOSPC;
-}
-
-static void toi_insert_chain_in_prio_list(struct toi_bdev_info *this)
-{
- struct toi_bdev_info **prev_ptr;
- struct toi_bdev_info *cur;
-
- /* Loop through the existing chain, finding where to insert it */
- prev_ptr = &prio_chain_head;
- cur = prio_chain_head;
-
- while (cur && cur->prio >= this->prio) {
- prev_ptr = &cur->next;
- cur = cur->next;
- }
-
- this->next = *prev_ptr;
- *prev_ptr = this;
-
- this = prio_chain_head;
- while (this)
- this = this->next;
- num_chains++;
-}
-
-/**
- * toi_extent_state_goto_start - reinitialize an extent chain iterator
- * @state: Iterator to reinitialize
- **/
-void toi_extent_state_goto_start(void)
-{
- struct toi_bdev_info *this = prio_chain_head;
-
- while (this) {
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- "Setting current extent to %p.", this->blocks.first);
- this->blocks.current_extent = this->blocks.first;
- if (this->blocks.current_extent) {
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- "Setting current offset to %lu.",
- this->blocks.current_extent->start);
- this->blocks.current_offset =
- this->blocks.current_extent->start;
- }
-
- this = this->next;
- }
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Setting current chain to %p.",
- prio_chain_head);
- toi_writer_posn.current_chain = prio_chain_head;
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Leaving extent state goto start.");
-}
-
-/**
- * toi_extent_state_save - save state of the iterator
- * @state: Current state of the chain
- * @saved_state: Iterator to populate
- *
- * Given a state and a struct hibernate_extent_state_store, save the current
- * position in a format that can be used with relocated chains (at
- * resume time).
- **/
-void toi_extent_state_save(int slot)
-{
- struct toi_bdev_info *cur_chain = prio_chain_head;
- struct hibernate_extent *extent;
- struct hibernate_extent_saved_state *chain_state;
- int i = 0;
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "toi_extent_state_save, slot %d.",
- slot);
-
- if (!toi_writer_posn.current_chain) {
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "No current chain => "
- "chain_num = -1.");
- toi_writer_posn.saved_chain_number[slot] = -1;
- return;
- }
-
- while (cur_chain) {
- i++;
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Saving chain %d (%p) "
- "state, slot %d.", i, cur_chain, slot);
-
- chain_state = &cur_chain->saved_state[slot];
-
- chain_state->offset = cur_chain->blocks.current_offset;
-
- if (toi_writer_posn.current_chain == cur_chain) {
- toi_writer_posn.saved_chain_number[slot] = i;
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "This is the chain "
- "we were on => chain_num is %d.", i);
- }
-
- if (!cur_chain->blocks.current_extent) {
- chain_state->extent_num = 0;
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "No current extent "
- "for this chain => extent_num %d is 0.",
- i);
- cur_chain = cur_chain->next;
- continue;
- }
-
- extent = cur_chain->blocks.first;
- chain_state->extent_num = 1;
-
- while (extent != cur_chain->blocks.current_extent) {
- chain_state->extent_num++;
- extent = extent->next;
- }
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "extent num %d is %d.", i,
- chain_state->extent_num);
-
- cur_chain = cur_chain->next;
- }
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- "Completed saving extent state slot %d.", slot);
-}
-
-/**
- * toi_extent_state_restore - restore the position saved by extent_state_save
- * @state: State to populate
- * @saved_state: Iterator saved to restore
- **/
-void toi_extent_state_restore(int slot)
-{
- int i = 0;
- struct toi_bdev_info *cur_chain = prio_chain_head;
- struct hibernate_extent_saved_state *chain_state;
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- "toi_extent_state_restore - slot %d.", slot);
-
- if (toi_writer_posn.saved_chain_number[slot] == -1) {
- toi_writer_posn.current_chain = NULL;
- return;
- }
-
- while (cur_chain) {
- int posn;
- int j;
- i++;
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Restoring chain %d (%p) "
- "state, slot %d.", i, cur_chain, slot);
-
- chain_state = &cur_chain->saved_state[slot];
-
- posn = chain_state->extent_num;
-
- cur_chain->blocks.current_extent = cur_chain->blocks.first;
- cur_chain->blocks.current_offset = chain_state->offset;
-
- if (i == toi_writer_posn.saved_chain_number[slot]) {
- toi_writer_posn.current_chain = cur_chain;
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- "Found current chain.");
- }
-
- for (j = 0; j < 4; j++)
- if (i == toi_writer_posn.saved_chain_number[j]) {
- toi_writer_posn.saved_chain_ptr[j] = cur_chain;
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- "Found saved chain ptr %d (%p) (offset"
- " %d).", j, cur_chain,
- cur_chain->saved_state[j].offset);
- }
-
- if (posn) {
- while (--posn)
- cur_chain->blocks.current_extent =
- cur_chain->blocks.current_extent->next;
- } else
- cur_chain->blocks.current_extent = NULL;
-
- cur_chain = cur_chain->next;
- }
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Done.");
- if (test_action_state(TOI_LOGALL))
- dump_block_chains();
-}
-
-/*
- * Storage needed
- *
- * Returns amount of space in the image header required
- * for the chain data. This ignores the links between
- * pages, which we factor in when allocating the space.
- */
-int toi_bio_devinfo_storage_needed(void)
-{
- int result = sizeof(num_chains);
- struct toi_bdev_info *chain = prio_chain_head;
-
- while (chain) {
- result += metadata_size;
-
- /* Chain size */
- result += sizeof(int);
-
- /* Extents */
- result += (2 * sizeof(unsigned long) *
- chain->blocks.num_extents);
-
- chain = chain->next;
- }
-
- result += 4 * sizeof(int);
- return result;
-}
-
-static unsigned long chain_pages_used(struct toi_bdev_info *chain)
-{
- struct hibernate_extent *this = chain->blocks.first;
- struct hibernate_extent_saved_state *state = &chain->saved_state[3];
- unsigned long size = 0;
- int extent_idx = 1;
-
- if (!state->extent_num) {
- if (!this)
- return 0;
- else
- return chain->blocks.size;
- }
-
- while (extent_idx < state->extent_num) {
- size += (this->end - this->start + 1);
- this = this->next;
- extent_idx++;
- }
-
- /* We didn't use the one we're sitting on, so don't count it */
- return size + state->offset - this->start;
-}
-
-void toi_bio_free_unused_storage_chain(struct toi_bdev_info *chain)
-{
- unsigned long used = chain_pages_used(chain);
-
- /* Free the storage */
- unsigned long first_freed = 0;
-
- if (chain->allocator->bio_allocator_ops->free_unused_storage)
- first_freed = chain->allocator->bio_allocator_ops->free_unused_storage(chain, used);
-
- printk(KERN_EMERG "Used %ld blocks in this chain. First extent freed is %lx.\n", used, first_freed);
-
- /* Adjust / free the extents. */
- toi_put_extent_chain_from(&chain->blocks, first_freed);
-
- {
- struct hibernate_extent *this = chain->blocks.first;
- while (this) {
- printk("Extent %lx-%lx.\n", this->start, this->end);
- this = this->next;
- }
- }
-}
-
-/**
- * toi_serialise_extent_chain - write a chain in the image
- * @chain: Chain to write.
- **/
-static int toi_serialise_extent_chain(struct toi_bdev_info *chain)
-{
- struct hibernate_extent *this;
- int ret;
- int i = 1;
-
- chain->pages_used = chain_pages_used(chain);
-
- if (test_action_state(TOI_LOGALL))
- dump_block_chains();
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Serialising chain (dev_t %lx).",
- chain->dev_t);
- /* Device info - dev_t, prio, bmap_shift, blocks per page, positions */
- ret = toiActiveAllocator->rw_header_chunk(WRITE, &toi_blockwriter_ops,
- (char *) &chain->uuid, metadata_size);
- if (ret)
- return ret;
-
- /* Num extents */
- ret = toiActiveAllocator->rw_header_chunk(WRITE, &toi_blockwriter_ops,
- (char *) &chain->blocks.num_extents, sizeof(int));
- if (ret)
- return ret;
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "%d extents.",
- chain->blocks.num_extents);
-
- this = chain->blocks.first;
- while (this) {
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Extent %d.", i);
- ret = toiActiveAllocator->rw_header_chunk(WRITE,
- &toi_blockwriter_ops,
- (char *) this, 2 * sizeof(this->start));
- if (ret)
- return ret;
- this = this->next;
- i++;
- }
-
- return ret;
-}
-
-int toi_serialise_extent_chains(void)
-{
- struct toi_bdev_info *this = prio_chain_head;
- int result;
-
- /* Write the number of chains */
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Write number of chains (%d)",
- num_chains);
- result = toiActiveAllocator->rw_header_chunk(WRITE,
- &toi_blockwriter_ops, (char *) &num_chains,
- sizeof(int));
- if (result)
- return result;
-
- /* Then the chains themselves */
- while (this) {
- result = toi_serialise_extent_chain(this);
- if (result)
- return result;
- this = this->next;
- }
-
- /*
- * Finally, the chain we should be on at the start of each
- * section.
- */
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Saved chain numbers.");
- result = toiActiveAllocator->rw_header_chunk(WRITE,
- &toi_blockwriter_ops,
- (char *) &toi_writer_posn.saved_chain_number[0],
- 4 * sizeof(int));
-
- return result;
-}
-
-int toi_register_storage_chain(struct toi_bdev_info *new)
-{
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Inserting chain %p into list.",
- new);
- toi_insert_chain_in_prio_list(new);
- return 0;
-}
-
-static void free_bdev_info(struct toi_bdev_info *chain)
-{
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Free chain %p.", chain);
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, " - Block extents.");
- toi_put_extent_chain(&chain->blocks);
-
- /*
- * The allocator may need to do more than just free the chains
- * (swap_free, for example). Don't call from boot kernel.
- */
- toi_message(TOI_BIO, TOI_VERBOSE, 0, " - Allocator extents.");
- if (chain->allocator)
- chain->allocator->bio_allocator_ops->free_storage(chain);
-
- /*
- * Dropping out of reading atomic copy? Need to undo
- * toi_open_by_devnum.
- */
- toi_message(TOI_BIO, TOI_VERBOSE, 0, " - Bdev.");
- if (chain->bdev && !IS_ERR(chain->bdev) &&
- chain->bdev != resume_block_device &&
- chain->bdev != header_block_device &&
- test_toi_state(TOI_TRYING_TO_RESUME))
- toi_close_bdev(chain->bdev);
-
- /* Poison */
- toi_message(TOI_BIO, TOI_VERBOSE, 0, " - Struct.");
- toi_kfree(39, chain, sizeof(*chain));
-
- if (prio_chain_head == chain)
- prio_chain_head = NULL;
-
- num_chains--;
-}
-
-void free_all_bdev_info(void)
-{
- struct toi_bdev_info *this = prio_chain_head;
-
- while (this) {
- struct toi_bdev_info *next = this->next;
- free_bdev_info(this);
- this = next;
- }
-
- memset((char *) &toi_writer_posn, 0, sizeof(toi_writer_posn));
- prio_chain_head = NULL;
-}
-
-static void set_up_start_position(void)
-{
- toi_writer_posn.current_chain = prio_chain_head;
- go_next_page(0, 0);
-}
-
-/**
- * toi_load_extent_chain - read back a chain saved in the image
- * @chain: Chain to load
- *
- * The linked list of extents is reconstructed from the disk. chain will point
- * to the first entry.
- **/
-int toi_load_extent_chain(int index, int *num_loaded)
-{
- struct toi_bdev_info *chain = toi_kzalloc(39,
- sizeof(struct toi_bdev_info), GFP_ATOMIC);
- struct hibernate_extent *this, *last = NULL;
- int i, ret;
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Loading extent chain %d.", index);
- /* Get dev_t, prio, bmap_shift, blocks per page, positions */
- ret = toiActiveAllocator->rw_header_chunk_noreadahead(READ, NULL,
- (char *) &chain->uuid, metadata_size);
-
- if (ret) {
- printk(KERN_ERR "Failed to read the size of extent chain.\n");
- toi_kfree(39, chain, sizeof(*chain));
- return 1;
- }
-
- toi_bkd.pages_used[index] = chain->pages_used;
-
- ret = toiActiveAllocator->rw_header_chunk_noreadahead(READ, NULL,
- (char *) &chain->blocks.num_extents, sizeof(int));
- if (ret) {
- printk(KERN_ERR "Failed to read the size of extent chain.\n");
- toi_kfree(39, chain, sizeof(*chain));
- return 1;
- }
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "%d extents.",
- chain->blocks.num_extents);
-
- for (i = 0; i < chain->blocks.num_extents; i++) {
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Extent %d.", i + 1);
-
- this = toi_kzalloc(2, sizeof(struct hibernate_extent),
- TOI_ATOMIC_GFP);
- if (!this) {
- printk(KERN_INFO "Failed to allocate a new extent.\n");
- free_bdev_info(chain);
- return -ENOMEM;
- }
- this->next = NULL;
- /* Get the next page */
- ret = toiActiveAllocator->rw_header_chunk_noreadahead(READ,
- NULL, (char *) this, 2 * sizeof(this->start));
- if (ret) {
- printk(KERN_INFO "Failed to read an extent.\n");
- toi_kfree(2, this, sizeof(struct hibernate_extent));
- free_bdev_info(chain);
- return 1;
- }
-
- if (last)
- last->next = this;
- else {
- char b1[32], b2[32], b3[32];
- /*
- * Open the bdev
- */
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- "Chain dev_t is %s. Resume dev t is %s. Header"
- " bdev_t is %s.\n",
- format_dev_t(b1, chain->dev_t),
- format_dev_t(b2, resume_dev_t),
- format_dev_t(b3, toi_sig_data->header_dev_t));
-
- if (chain->dev_t == resume_dev_t)
- chain->bdev = resume_block_device;
- else if (chain->dev_t == toi_sig_data->header_dev_t)
- chain->bdev = header_block_device;
- else {
- chain->bdev = toi_open_bdev(chain->uuid,
- chain->dev_t, 1);
- if (IS_ERR(chain->bdev)) {
- free_bdev_info(chain);
- return -ENODEV;
- }
- }
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Chain bmap shift "
- "is %d and blocks per page is %d.",
- chain->bmap_shift,
- chain->blocks_per_page);
-
- chain->blocks.first = this;
-
- /*
- * Couldn't do this earlier, but can't do
- * goto_start now - we may have already used blocks
- * in the first chain.
- */
- chain->blocks.current_extent = this;
- chain->blocks.current_offset = this->start;
-
- /*
- * Can't wait until we've read the whole chain
- * before we insert it in the list. We might need
- * this chain to read the next page in the header
- */
- toi_insert_chain_in_prio_list(chain);
- }
-
- /*
- * We have to wait until 2 extents are loaded before setting up
- * properly because if the first extent has only one page, we
- * will need to put the position on the second extent. Sounds
- * obvious, but it wasn't!
- */
- (*num_loaded)++;
- if ((*num_loaded) == 2)
- set_up_start_position();
- last = this;
- }
-
- /*
- * Shouldn't get empty chains, but it's not impossible. Link them in so
- * they get freed properly later.
- */
- if (!chain->blocks.num_extents)
- toi_insert_chain_in_prio_list(chain);
-
- if (!chain->blocks.current_extent) {
- chain->blocks.current_extent = chain->blocks.first;
- if (chain->blocks.current_extent)
- chain->blocks.current_offset =
- chain->blocks.current_extent->start;
- }
- return 0;
-}
-
-int toi_load_extent_chains(void)
-{
- int result;
- int to_load;
- int i;
- int extents_loaded = 0;
-
- result = toiActiveAllocator->rw_header_chunk_noreadahead(READ, NULL,
- (char *) &to_load,
- sizeof(int));
- if (result)
- return result;
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "%d chains to read.", to_load);
-
- for (i = 0; i < to_load; i++) {
- toi_message(TOI_BIO, TOI_VERBOSE, 0, " >> Loading chain %d/%d.",
- i, to_load);
- result = toi_load_extent_chain(i, &extents_loaded);
- if (result)
- return result;
- }
-
- /* If we never got to a second extent, we still need to do this. */
- if (extents_loaded == 1)
- set_up_start_position();
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Save chain numbers.");
- result = toiActiveAllocator->rw_header_chunk_noreadahead(READ,
- &toi_blockwriter_ops,
- (char *) &toi_writer_posn.saved_chain_number[0],
- 4 * sizeof(int));
-
- return result;
-}
-
-static int toi_end_of_stream(int writing, int section_barrier)
-{
- struct toi_bdev_info *cur_chain = toi_writer_posn.current_chain;
- int compare_to = next_section[current_stream];
- struct toi_bdev_info *compare_chain =
- toi_writer_posn.saved_chain_ptr[compare_to];
- int compare_offset = compare_chain ?
- compare_chain->saved_state[compare_to].offset : 0;
-
- if (!section_barrier)
- return 0;
-
- if (!cur_chain)
- return 1;
-
- if (cur_chain == compare_chain &&
- cur_chain->blocks.current_offset == compare_offset) {
- if (writing) {
- if (!current_stream) {
- debug_broken_header();
- return 1;
- }
- } else {
- more_readahead = 0;
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- "Reached the end of stream %d "
- "(not an error).", current_stream);
- return 1;
- }
- }
-
- return 0;
-}
-
-/**
- * go_next_page - skip blocks to the start of the next page
- * @writing: Whether we're reading or writing the image.
- *
- * Go forward one page.
- **/
-int go_next_page(int writing, int section_barrier)
-{
- struct toi_bdev_info *cur_chain = toi_writer_posn.current_chain;
- int max = cur_chain ? cur_chain->blocks_per_page : 1;
-
- /* Nope. Go foward a page - or maybe two. Don't stripe the header,
- * so that bad fragmentation doesn't put the extent data containing
- * the location of the second page out of the first header page.
- */
- if (toi_extent_state_next(max, current_stream)) {
- /* Don't complain if readahead falls off the end */
- if (writing && section_barrier) {
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Extent state eof. "
- "Expected compression ratio too optimistic?");
- if (test_action_state(TOI_LOGALL))
- dump_block_chains();
- }
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Ran out of extents to "
- "read/write. (Not necessarily a fatal error.");
- return -ENOSPC;
- }
-
- return 0;
-}
-
-int devices_of_same_priority(struct toi_bdev_info *this)
-{
- struct toi_bdev_info *check = prio_chain_head;
- int i = 0;
-
- while (check) {
- if (check->prio == this->prio)
- i++;
- check = check->next;
- }
-
- return i;
-}
-
-/**
- * toi_bio_rw_page - do i/o on the next disk page in the image
- * @writing: Whether reading or writing.
- * @page: Page to do i/o on.
- * @is_readahead: Whether we're doing readahead
- * @free_group: The group used in allocating the page
- *
- * Submit a page for reading or writing, possibly readahead.
- * Pass the group used in allocating the page as well, as it should
- * be freed on completion of the bio if we're writing the page.
- **/
-int toi_bio_rw_page(int writing, struct page *page,
- int is_readahead, int free_group)
-{
- int result = toi_end_of_stream(writing, 1);
- struct toi_bdev_info *dev_info = toi_writer_posn.current_chain;
-
- if (result) {
- if (writing)
- abort_hibernate(TOI_INSUFFICIENT_STORAGE,
- "Insufficient storage for your image.");
- else
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Seeking to "
- "read/write another page when stream has "
- "ended.");
- return -ENOSPC;
- }
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- "%s %lx:%ld",
- writing ? "Write" : "Read",
- dev_info->dev_t, dev_info->blocks.current_offset);
-
- result = toi_do_io(writing, dev_info->bdev,
- dev_info->blocks.current_offset << dev_info->bmap_shift,
- page, is_readahead, 0, free_group);
-
- /* Ignore the result here - will check end of stream if come in again */
- go_next_page(writing, 1);
-
- if (result)
- printk(KERN_ERR "toi_do_io returned %d.\n", result);
- return result;
-}
-
-dev_t get_header_dev_t(void)
-{
- return prio_chain_head->dev_t;
-}
-
-struct block_device *get_header_bdev(void)
-{
- return prio_chain_head->bdev;
-}
-
-unsigned long get_headerblock(void)
-{
- return prio_chain_head->blocks.first->start <<
- prio_chain_head->bmap_shift;
-}
-
-int get_main_pool_phys_params(void)
-{
- struct toi_bdev_info *this = prio_chain_head;
- int result;
-
- while (this) {
- result = this->allocator->bio_allocator_ops->bmap(this);
- if (result)
- return result;
- this = this->next;
- }
-
- return 0;
-}
-
-static int apply_header_reservation(void)
-{
- int i;
-
- if (!header_pages_reserved) {
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- "No header pages reserved at the moment.");
- return 0;
- }
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Applying header reservation.");
-
- /* Apply header space reservation */
- toi_extent_state_goto_start();
-
- for (i = 0; i < header_pages_reserved; i++)
- if (go_next_page(1, 0))
- return -ENOSPC;
-
- /* The end of header pages will be the start of pageset 2 */
- toi_extent_state_save(2);
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- "Finished applying header reservation.");
- return 0;
-}
-
-static int toi_bio_register_storage(void)
-{
- int result = 0;
- struct toi_module_ops *this_module;
-
- list_for_each_entry(this_module, &toi_modules, module_list) {
- if (!this_module->enabled ||
- this_module->type != BIO_ALLOCATOR_MODULE)
- continue;
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- "Registering storage from %s.",
- this_module->name);
- result = this_module->bio_allocator_ops->register_storage();
- if (result)
- break;
- }
-
- return result;
-}
-
-void toi_bio_free_unused_storage(void)
-{
- struct toi_bdev_info *this = prio_chain_head;
-
- while (this) {
- toi_bio_free_unused_storage_chain(this);
- this = this->next;
- }
-}
-
-int toi_bio_allocate_storage(unsigned long request)
-{
- struct toi_bdev_info *chain = prio_chain_head;
- unsigned long to_get = request;
- unsigned long extra_pages, needed;
- int no_free = 0;
-
- if (!chain) {
- int result = toi_bio_register_storage();
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "toi_bio_allocate_storage: "
- "Registering storage.");
- if (result)
- return 0;
- chain = prio_chain_head;
- if (!chain) {
- printk("TuxOnIce: No storage was registered.\n");
- return 0;
- }
- }
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "toi_bio_allocate_storage: "
- "Request is %lu pages.", request);
- extra_pages = DIV_ROUND_UP(request * (sizeof(unsigned long)
- + sizeof(int)), PAGE_SIZE);
- needed = request + extra_pages + header_pages_reserved;
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Adding %lu extra pages and %lu "
- "for header => %lu.",
- extra_pages, header_pages_reserved, needed);
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Already allocated %lu pages.",
- raw_pages_allocd);
-
- to_get = needed > raw_pages_allocd ? needed - raw_pages_allocd : 0;
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Need to get %lu pages.", to_get);
-
- if (!to_get)
- return apply_header_reservation();
-
- while (to_get && chain) {
- int num_group = devices_of_same_priority(chain);
- int divisor = num_group - no_free;
- int i;
- unsigned long portion = DIV_ROUND_UP(to_get, divisor);
- unsigned long got = 0;
- unsigned long got_this_round = 0;
- struct toi_bdev_info *top = chain;
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- " Start of loop. To get is %lu. Divisor is %d.",
- to_get, divisor);
- no_free = 0;
-
- /*
- * We're aiming to spread the allocated storage as evenly
- * as possible, but we also want to get all the storage we
- * can off this priority.
- */
- for (i = 0; i < num_group; i++) {
- struct toi_bio_allocator_ops *ops =
- chain->allocator->bio_allocator_ops;
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- " Asking for %lu pages from chain %p.",
- portion, chain);
- got = ops->allocate_storage(chain, portion);
- toi_message(TOI_BIO, TOI_VERBOSE, 0,
- " Got %lu pages from allocator %p.",
- got, chain);
- if (!got)
- no_free++;
- got_this_round += got;
- chain = chain->next;
- }
- toi_message(TOI_BIO, TOI_VERBOSE, 0, " Loop finished. Got a "
- "total of %lu pages from %d allocators.",
- got_this_round, divisor - no_free);
-
- raw_pages_allocd += got_this_round;
- to_get = needed > raw_pages_allocd ? needed - raw_pages_allocd :
- 0;
-
- /*
- * If we got anything from chains of this priority and we
- * still have storage to allocate, go over this priority
- * again.
- */
- if (got_this_round && to_get)
- chain = top;
- else
- no_free = 0;
- }
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Finished allocating. Calling "
- "get_main_pool_phys_params");
- /* Now let swap allocator bmap the pages */
- get_main_pool_phys_params();
-
- toi_message(TOI_BIO, TOI_VERBOSE, 0, "Done. Reserving header.");
- return apply_header_reservation();
-}
-
-void toi_bio_chains_post_atomic(struct toi_boot_kernel_data *bkd)
-{
- int i = 0;
- struct toi_bdev_info *cur_chain = prio_chain_head;
-
- while (cur_chain) {
- cur_chain->pages_used = bkd->pages_used[i];
- cur_chain = cur_chain->next;
- i++;
- }
-}
-
-int toi_bio_chains_debug_info(char *buffer, int size)
-{
- /* Show what we actually used */
- struct toi_bdev_info *cur_chain = prio_chain_head;
- int len = 0;
-
- while (cur_chain) {
- len += scnprintf(buffer + len, size - len, " Used %lu pages "
- "from %s.\n", cur_chain->pages_used,
- cur_chain->name);
- cur_chain = cur_chain->next;
- }
-
- return len;
-}
-
-void toi_bio_store_inc_image_ptr(struct toi_incremental_image_pointer *ptr)
-{
- struct toi_bdev_info *this = toi_writer_posn.current_chain,
- *cmp = prio_chain_head;
-
- ptr->save.chain = 1;
- while (this != cmp) {
- ptr->save.chain++;
- cmp = cmp->next;
- }
- ptr->save.block = this->blocks.current_offset;
-
- /* Save the raw info internally for quicker access when updating pointers */
- ptr->bdev = this->bdev;
- ptr->block = this->blocks.current_offset << this->bmap_shift;
-}
-
-void toi_bio_restore_inc_image_ptr(struct toi_incremental_image_pointer *ptr)
-{
- int i = ptr->save.chain - 1;
- struct toi_bdev_info *this;
- struct hibernate_extent *hib;
-
- /* Find chain by stored index */
- this = prio_chain_head;
- while (i) {
- this = this->next;
- i--;
- }
- toi_writer_posn.current_chain = this;
-
- /* Restore block */
- this->blocks.current_offset = ptr->save.block;
-
- /* Find current offset from block number */
- hib = this->blocks.first;
-
- while (hib->start > ptr->save.block) {
- hib = hib->next;
- }
-
- this->blocks.last_touched = this->blocks.current_extent = hib;
-}