Linux-libre 4.5-gnu

1 files changed, 0 insertions, 484 deletions

diff --git a/kernel/power/tuxonice_file.c b/kernel/power/tuxonice_file.c
deleted file mode 100644
index baf191211..000000000
--- a/kernel/power/tuxonice_file.c
+++ /dev/null
@@ -1,484 +0,0 @@
-/*
- * kernel/power/tuxonice_file.c
- *
- * Copyright (C) 2005-2015 Nigel Cunningham (nigel at nigelcunningham com au)
- *
- * Distributed under GPLv2.
- *
- * This file encapsulates functions for usage of a simple file as a
- * backing store. It is based upon the swapallocator, and shares the
- * same basic working. Here, though, we have nothing to do with
- * swapspace, and only one device to worry about.
- *
- * The user can just
- *
- * echo TuxOnIce > /path/to/my_file
- *
- * dd if=/dev/zero bs=1M count=<file_size_desired> >> /path/to/my_file
- *
- * and
- *
- * echo /path/to/my_file > /sys/power/tuxonice/file/target
- *
- * then put what they find in /sys/power/tuxonice/resume
- * as their resume= parameter in lilo.conf (and rerun lilo if using it).
- *
- * Having done this, they're ready to hibernate and resume.
- *
- * TODO:
- * - File resizing.
- */
-
-#include <linux/blkdev.h>
-#include <linux/mount.h>
-#include <linux/fs.h>
-#include <linux/fs_uuid.h>
-
-#include "tuxonice.h"
-#include "tuxonice_modules.h"
-#include "tuxonice_bio.h"
-#include "tuxonice_alloc.h"
-#include "tuxonice_builtin.h"
-#include "tuxonice_sysfs.h"
-#include "tuxonice_ui.h"
-#include "tuxonice_io.h"
-
-#define target_is_normal_file() (S_ISREG(target_inode->i_mode))
-
-static struct toi_module_ops toi_fileops;
-
-static struct file *target_file;
-static struct block_device *toi_file_target_bdev;
-static unsigned long pages_available, pages_allocated;
-static char toi_file_target[256];
-static struct inode *target_inode;
-static int file_target_priority;
-static int used_devt;
-static int target_claim;
-static dev_t toi_file_dev_t;
-static int sig_page_index;
-
-/* For test_toi_file_target */
-static struct toi_bdev_info *file_chain;
-
-static int has_contiguous_blocks(struct toi_bdev_info *dev_info, int page_num)
-{
-        int j;
-        sector_t last = 0;
-
-        for (j = 0; j < dev_info->blocks_per_page; j++) {
-                sector_t this = bmap(target_inode,
-                                page_num * dev_info->blocks_per_page + j);
-
-                if (!this || (last && (last + 1) != this))
-                        break;
-
-                last = this;
-        }
-
-        return j == dev_info->blocks_per_page;
-}
-
-static unsigned long get_usable_pages(struct toi_bdev_info *dev_info)
-{
-        unsigned long result = 0;
-        struct block_device *bdev = dev_info->bdev;
-        int i;
-
-        switch (target_inode->i_mode & S_IFMT) {
-        case S_IFSOCK:
-        case S_IFCHR:
-        case S_IFIFO: /* Socket, Char, Fifo */
-                return -1;
-        case S_IFREG: /* Regular file: current size - holes + free
-                         space on part */
-                for (i = 0; i < (target_inode->i_size >> PAGE_SHIFT) ; i++) {
-                        if (has_contiguous_blocks(dev_info, i))
-                                result++;
-                }
-                break;
-        case S_IFBLK: /* Block device */
-                if (!bdev->bd_disk) {
-                        toi_message(TOI_IO, TOI_VERBOSE, 0,
-                                        "bdev->bd_disk null.");
-                        return 0;
-                }
-
-                result = (bdev->bd_part ?
-                        bdev->bd_part->nr_sects :
-                        get_capacity(bdev->bd_disk)) >> (PAGE_SHIFT - 9);
-        }
-
-
-        return result;
-}
-
-static int toi_file_register_storage(void)
-{
-        struct toi_bdev_info *devinfo;
-        int result = 0;
-        struct fs_info *fs_info;
-
-        toi_message(TOI_IO, TOI_VERBOSE, 0, "toi_file_register_storage.");
-        if (!strlen(toi_file_target)) {
-                toi_message(TOI_IO, TOI_VERBOSE, 0, "Register file storage: "
-                                "No target filename set.");
-                return 0;
-        }
-
-        target_file = filp_open(toi_file_target, O_RDONLY|O_LARGEFILE, 0);
-        toi_message(TOI_IO, TOI_VERBOSE, 0, "filp_open %s returned %p.",
-                        toi_file_target, target_file);
-
-        if (IS_ERR(target_file) || !target_file) {
-                target_file = NULL;
-                toi_file_dev_t = name_to_dev_t(toi_file_target);
-                if (!toi_file_dev_t) {
-                        struct kstat stat;
-                        int error = vfs_stat(toi_file_target, &stat);
-                        printk(KERN_INFO "Open file %s returned %p and "
-                                        "name_to_devt failed.\n",
-                                        toi_file_target, target_file);
-                        if (error) {
-                                printk(KERN_INFO "Stating the file also failed."
-                                        " Nothing more we can do.\n");
-                                return 0;
-                        } else
-                                toi_file_dev_t = stat.rdev;
-                }
-
-                toi_file_target_bdev = toi_open_by_devnum(toi_file_dev_t);
-                if (IS_ERR(toi_file_target_bdev)) {
-                        printk(KERN_INFO "Got a dev_num (%lx) but failed to "
-                                        "open it.\n",
-                                        (unsigned long) toi_file_dev_t);
-                        toi_file_target_bdev = NULL;
-                        return 0;
-                }
-                used_devt = 1;
-                target_inode = toi_file_target_bdev->bd_inode;
-        } else
-                target_inode = target_file->f_mapping->host;
-
-        toi_message(TOI_IO, TOI_VERBOSE, 0, "Succeeded in opening the target.");
-        if (S_ISLNK(target_inode->i_mode) || S_ISDIR(target_inode->i_mode) ||
-            S_ISSOCK(target_inode->i_mode) || S_ISFIFO(target_inode->i_mode)) {
-                printk(KERN_INFO "File support works with regular files,"
-                                " character files and block devices.\n");
-                /* Cleanup routine will undo the above */
-                return 0;
-        }
-
-        if (!used_devt) {
-                if (S_ISBLK(target_inode->i_mode)) {
-                        toi_file_target_bdev = I_BDEV(target_inode);
-                        if (!blkdev_get(toi_file_target_bdev, FMODE_WRITE |
-                                                FMODE_READ, NULL))
-                                target_claim = 1;
-                } else
-                        toi_file_target_bdev = target_inode->i_sb->s_bdev;
-                if (!toi_file_target_bdev) {
-                        printk(KERN_INFO "%s is not a valid file allocator "
-                                        "target.\n", toi_file_target);
-                        return 0;
-                }
-                toi_file_dev_t = toi_file_target_bdev->bd_dev;
-        }
-
-        devinfo = toi_kzalloc(39, sizeof(struct toi_bdev_info), GFP_ATOMIC);
-        if (!devinfo) {
-                printk("Failed to allocate a toi_bdev_info struct for the file allocator.\n");
-                return -ENOMEM;
-        }
-
-        devinfo->bdev = toi_file_target_bdev;
-        devinfo->allocator = &toi_fileops;
-        devinfo->allocator_index = 0;
-
-        fs_info = fs_info_from_block_dev(toi_file_target_bdev);
-        if (fs_info && !IS_ERR(fs_info)) {
-                memcpy(devinfo->uuid, &fs_info->uuid, 16);
-                free_fs_info(fs_info);
-        } else
-                result = (int) PTR_ERR(fs_info);
-
-        /* Unlike swap code, only complain if fs_info_from_block_dev returned
-         * -ENOMEM. The 'file' might be a full partition, so might validly not
-         * have an identifiable type, UUID etc.
-         */
-        if (result)
-                printk(KERN_DEBUG "Failed to get fs_info for file device (%d).\n",
-                                result);
-        devinfo->dev_t = toi_file_dev_t;
-        devinfo->prio = file_target_priority;
-        devinfo->bmap_shift = target_inode->i_blkbits - 9;
-        devinfo->blocks_per_page =
-                (1 << (PAGE_SHIFT - target_inode->i_blkbits));
-        sprintf(devinfo->name, "file %s", toi_file_target);
-        file_chain = devinfo;
-        toi_message(TOI_IO, TOI_VERBOSE, 0, "Dev_t is %lx. Prio is %d. Bmap "
-                        "shift is %d. Blocks per page %d.",
-                        devinfo->dev_t, devinfo->prio, devinfo->bmap_shift,
-                        devinfo->blocks_per_page);
-
-        /* Keep one aside for the signature */
-        pages_available = get_usable_pages(devinfo) - 1;
-
-        toi_message(TOI_IO, TOI_VERBOSE, 0, "Registering file storage, %lu "
-                        "pages.", pages_available);
-
-        toi_bio_ops.register_storage(devinfo);
-        return 0;
-}
-
-static unsigned long toi_file_storage_available(void)
-{
-        return pages_available;
-}
-
-static int toi_file_allocate_storage(struct toi_bdev_info *chain,
-                unsigned long request)
-{
-        unsigned long available = pages_available - pages_allocated;
-        unsigned long to_add = min(available, request);
-
-        toi_message(TOI_IO, TOI_VERBOSE, 0, "Pages available is %lu. Allocated "
-                "is %lu. Allocating %lu pages from file.",
-                pages_available, pages_allocated, to_add);
-        pages_allocated += to_add;
-
-        return to_add;
-}
-
-/**
- * __populate_block_list - add an extent to the chain
- * @min:        Start of the extent (first physical block = sector)
- * @max:        End of the extent (last physical block = sector)
- *
- * If TOI_TEST_BIO is set, print a debug message, outputting the min and max
- * fs block numbers.
- **/
-static int __populate_block_list(struct toi_bdev_info *chain, int min, int max)
-{
-        if (test_action_state(TOI_TEST_BIO))
-                toi_message(TOI_IO, TOI_VERBOSE, 0, "Adding extent %d-%d.",
-                        min << chain->bmap_shift,
-                        ((max + 1) << chain->bmap_shift) - 1);
-
-        return toi_add_to_extent_chain(&chain->blocks, min, max);
-}
-
-static int get_main_pool_phys_params(struct toi_bdev_info *chain)
-{
-        int i, extent_min = -1, extent_max = -1, result = 0, have_sig_page = 0;
-        unsigned long pages_mapped = 0;
-
-        toi_message(TOI_IO, TOI_VERBOSE, 0, "Getting file allocator blocks.");
-
-        if (chain->blocks.first)
-                toi_put_extent_chain(&chain->blocks);
-
-        if (!target_is_normal_file()) {
-                result = (pages_available > 0) ?
-                        __populate_block_list(chain, chain->blocks_per_page,
-                                (pages_allocated + 1) *
-                                chain->blocks_per_page - 1) : 0;
-                return result;
-        }
-
-        /*
-         * FIXME: We are assuming the first page is contiguous. Is that
-         * assumption always right?
-         */
-
-        for (i = 0; i < (target_inode->i_size >> PAGE_SHIFT); i++) {
-                sector_t new_sector;
-
-                if (!has_contiguous_blocks(chain, i))
-                        continue;
-
-                if (!have_sig_page) {
-                        have_sig_page = 1;
-                        sig_page_index = i;
-                        continue;
-                }
-
-                pages_mapped++;
-
-                /* Ignore first page - it has the header */
-                if (pages_mapped == 1)
-                        continue;
-
-                new_sector = bmap(target_inode, (i * chain->blocks_per_page));
-
-                /*
-                 * I'd love to be able to fill in holes and resize
-                 * files, but not yet...
-                 */
-
-                if (new_sector == extent_max + 1)
-                        extent_max += chain->blocks_per_page;
-                else {
-                        if (extent_min > -1) {
-                                result = __populate_block_list(chain,
-                                                extent_min, extent_max);
-                                if (result)
-                                        return result;
-                        }
-
-                        extent_min = new_sector;
-                        extent_max = extent_min +
-                                chain->blocks_per_page - 1;
-                }
-
-                if (pages_mapped == pages_allocated)
-                        break;
-        }
-
-        if (extent_min > -1) {
-                result = __populate_block_list(chain, extent_min, extent_max);
-                if (result)
-                        return result;
-        }
-
-        return 0;
-}
-
-static void toi_file_free_storage(struct toi_bdev_info *chain)
-{
-        pages_allocated = 0;
-        file_chain = NULL;
-}
-
-/**
- * toi_file_print_debug_stats - print debug info
- * @buffer:        Buffer to data to populate
- * @size:        Size of the buffer
- **/
-static int toi_file_print_debug_stats(char *buffer, int size)
-{
-        int len = scnprintf(buffer, size, "- File Allocator active.\n");
-
-        len += scnprintf(buffer+len, size-len, "  Storage available for "
-                        "image: %lu pages.\n", pages_available);
-
-        return len;
-}
-
-static void toi_file_cleanup(int finishing_cycle)
-{
-        if (toi_file_target_bdev) {
-                if (target_claim) {
-                        blkdev_put(toi_file_target_bdev, FMODE_WRITE | FMODE_READ);
-                        target_claim = 0;
-                }
-
-                if (used_devt) {
-                        blkdev_put(toi_file_target_bdev,
-                                        FMODE_READ | FMODE_NDELAY);
-                        used_devt = 0;
-                }
-                toi_file_target_bdev = NULL;
-                target_inode = NULL;
-        }
-
-        if (target_file) {
-                filp_close(target_file, NULL);
-                target_file = NULL;
-        }
-
-        pages_available = 0;
-}
-
-/**
- * test_toi_file_target - sysfs callback for /sys/power/tuxonince/file/target
- *
- * Test wheter the target file is valid for hibernating.
- **/
-static void test_toi_file_target(void)
-{
-        int result = toi_file_register_storage();
-        sector_t sector;
-        char buf[50];
-        struct fs_info *fs_info;
-
-        if (result || !file_chain)
-                return;
-
-        /* This doesn't mean we're in business. Is any storage available? */
-        if (!pages_available)
-                goto out;
-
-        toi_file_allocate_storage(file_chain, 1);
-        result = get_main_pool_phys_params(file_chain);
-        if (result)
-                goto out;
-
-
-        sector = bmap(target_inode, sig_page_index *
-                        file_chain->blocks_per_page) << file_chain->bmap_shift;
-
-        /* Use the uuid, or the dev_t if that fails */
-        fs_info = fs_info_from_block_dev(toi_file_target_bdev);
-        if (!fs_info || IS_ERR(fs_info)) {
-                bdevname(toi_file_target_bdev, buf);
-                sprintf(resume_file, "/dev/%s:%llu", buf,
-                                (unsigned long long) sector);
-        } else {
-                int i;
-                hex_dump_to_buffer(fs_info->uuid, 16, 32, 1, buf, 50, 0);
-
-                /* Remove the spaces */
-                for (i = 1; i < 16; i++) {
-                        buf[2 * i] = buf[3 * i];
-                        buf[2 * i + 1] = buf[3 * i + 1];
-                }
-                buf[32] = 0;
-                sprintf(resume_file, "UUID=%s:0x%llx", buf,
-                                (unsigned long long) sector);
-                free_fs_info(fs_info);
-        }
-
-        toi_attempt_to_parse_resume_device(0);
-out:
-        toi_file_free_storage(file_chain);
-        toi_bio_ops.free_storage();
-}
-
-static struct toi_sysfs_data sysfs_params[] = {
-        SYSFS_STRING("target", SYSFS_RW, toi_file_target, 256,
-                SYSFS_NEEDS_SM_FOR_WRITE, test_toi_file_target),
-        SYSFS_INT("enabled", SYSFS_RW, &toi_fileops.enabled, 0, 1, 0, NULL),
-        SYSFS_INT("priority", SYSFS_RW, &file_target_priority, -4095,
-                        4096, 0, NULL),
-};
-
-static struct toi_bio_allocator_ops toi_bio_fileops = {
-        .register_storage                        = toi_file_register_storage,
-        .storage_available                        = toi_file_storage_available,
-        .allocate_storage                        = toi_file_allocate_storage,
-        .bmap                                        = get_main_pool_phys_params,
-        .free_storage                                = toi_file_free_storage,
-};
-
-static struct toi_module_ops toi_fileops = {
-        .type                                        = BIO_ALLOCATOR_MODULE,
-        .name                                        = "file storage",
-        .directory                                = "file",
-        .module                                        = THIS_MODULE,
-        .print_debug_info                        = toi_file_print_debug_stats,
-        .cleanup                                = toi_file_cleanup,
-        .bio_allocator_ops                        = &toi_bio_fileops,
-
-        .sysfs_data                = sysfs_params,
-        .num_sysfs_entries        = sizeof(sysfs_params) /
-                sizeof(struct toi_sysfs_data),
-};
-
-/* ---- Registration ---- */
-static __init int toi_file_load(void)
-{
-        return toi_register_module(&toi_fileops);
-}
-
-late_initcall(toi_file_load);