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Diffstat (limited to 'block/uuid.c')
-rw-r--r--block/uuid.c509
1 files changed, 0 insertions, 509 deletions
diff --git a/block/uuid.c b/block/uuid.c
deleted file mode 100644
index c2416b9cb..000000000
--- a/block/uuid.c
+++ /dev/null
@@ -1,509 +0,0 @@
-#include <linux/blkdev.h>
-#include <linux/ctype.h>
-#include <linux/fs_uuid.h>
-#include <linux/slab.h>
-#include <linux/export.h>
-
-static int debug_enabled;
-
-#define PRINTK(fmt, args...) do { \
- if (debug_enabled) \
- printk(KERN_DEBUG fmt, ## args); \
- } while(0)
-
-#define PRINT_HEX_DUMP(v1, v2, v3, v4, v5, v6, v7, v8) \
- do { \
- if (debug_enabled) \
- print_hex_dump(v1, v2, v3, v4, v5, v6, v7, v8); \
- } while(0)
-
-/*
- * Simple UUID translation
- */
-
-struct uuid_info {
- const char *key;
- const char *name;
- long bkoff;
- unsigned sboff;
- unsigned sig_len;
- const char *magic;
- int uuid_offset;
- int last_mount_offset;
- int last_mount_size;
-};
-
-/*
- * Based on libuuid's blkid_magic array. Note that I don't
- * have uuid offsets for all of these yet - mssing ones are 0x0.
- * Further information welcome.
- *
- * Rearranged by page of fs signature for optimisation.
- */
-static struct uuid_info uuid_list[] = {
- { NULL, "oracleasm", 0, 32, 8, "ORCLDISK", 0x0, 0, 0 },
- { "ntfs", "ntfs", 0, 3, 8, "NTFS ", 0x0, 0, 0 },
- { "vfat", "vfat", 0, 0x52, 5, "MSWIN", 0x0, 0, 0 },
- { "vfat", "vfat", 0, 0x52, 8, "FAT32 ", 0x0, 0, 0 },
- { "vfat", "vfat", 0, 0x36, 5, "MSDOS", 0x0, 0, 0 },
- { "vfat", "vfat", 0, 0x36, 8, "FAT16 ", 0x0, 0, 0 },
- { "vfat", "vfat", 0, 0x36, 8, "FAT12 ", 0x0, 0, 0 },
- { "vfat", "vfat", 0, 0, 1, "\353", 0x0, 0, 0 },
- { "vfat", "vfat", 0, 0, 1, "\351", 0x0, 0, 0 },
- { "vfat", "vfat", 0, 0x1fe, 2, "\125\252", 0x0, 0, 0 },
- { "xfs", "xfs", 0, 0, 4, "XFSB", 0x20, 0, 0 },
- { "romfs", "romfs", 0, 0, 8, "-rom1fs-", 0x0, 0, 0 },
- { "bfs", "bfs", 0, 0, 4, "\316\372\173\033", 0, 0, 0 },
- { "cramfs", "cramfs", 0, 0, 4, "E=\315\050", 0x0, 0, 0 },
- { "qnx4", "qnx4", 0, 4, 6, "QNX4FS", 0, 0, 0 },
- { NULL, "crypt_LUKS", 0, 0, 6, "LUKS\xba\xbe", 0x0, 0, 0 },
- { "squashfs", "squashfs", 0, 0, 4, "sqsh", 0, 0, 0 },
- { "squashfs", "squashfs", 0, 0, 4, "hsqs", 0, 0, 0 },
- { "ocfs", "ocfs", 0, 8, 9, "OracleCFS", 0x0, 0, 0 },
- { "lvm2pv", "lvm2pv", 0, 0x018, 8, "LVM2 001", 0x0, 0, 0 },
- { "sysv", "sysv", 0, 0x3f8, 4, "\020~\030\375", 0, 0, 0 },
- { "ext", "ext", 1, 0x38, 2, "\123\357", 0x468, 0x42c, 4 },
- { "minix", "minix", 1, 0x10, 2, "\177\023", 0, 0, 0 },
- { "minix", "minix", 1, 0x10, 2, "\217\023", 0, 0, 0 },
- { "minix", "minix", 1, 0x10, 2, "\150\044", 0, 0, 0 },
- { "minix", "minix", 1, 0x10, 2, "\170\044", 0, 0, 0 },
- { "lvm2pv", "lvm2pv", 1, 0x018, 8, "LVM2 001", 0x0, 0, 0 },
- { "vxfs", "vxfs", 1, 0, 4, "\365\374\001\245", 0, 0, 0 },
- { "hfsplus", "hfsplus", 1, 0, 2, "BD", 0x0, 0, 0 },
- { "hfsplus", "hfsplus", 1, 0, 2, "H+", 0x0, 0, 0 },
- { "hfsplus", "hfsplus", 1, 0, 2, "HX", 0x0, 0, 0 },
- { "hfs", "hfs", 1, 0, 2, "BD", 0x0, 0, 0 },
- { "ocfs2", "ocfs2", 1, 0, 6, "OCFSV2", 0x0, 0, 0 },
- { "lvm2pv", "lvm2pv", 0, 0x218, 8, "LVM2 001", 0x0, 0, 0 },
- { "lvm2pv", "lvm2pv", 1, 0x218, 8, "LVM2 001", 0x0, 0, 0 },
- { "ocfs2", "ocfs2", 2, 0, 6, "OCFSV2", 0x0, 0, 0 },
- { "swap", "swap", 0, 0xff6, 10, "SWAP-SPACE", 0x40c, 0, 0 },
- { "swap", "swap", 0, 0xff6, 10, "SWAPSPACE2", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0xff6, 9, "S1SUSPEND", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0xff6, 9, "S2SUSPEND", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0xff6, 9, "ULSUSPEND", 0x40c, 0, 0 },
- { "ocfs2", "ocfs2", 4, 0, 6, "OCFSV2", 0x0, 0, 0 },
- { "ocfs2", "ocfs2", 8, 0, 6, "OCFSV2", 0x0, 0, 0 },
- { "hpfs", "hpfs", 8, 0, 4, "I\350\225\371", 0, 0, 0 },
- { "reiserfs", "reiserfs", 8, 0x34, 8, "ReIsErFs", 0x10054, 0, 0 },
- { "reiserfs", "reiserfs", 8, 20, 8, "ReIsErFs", 0x10054, 0, 0 },
- { "zfs", "zfs", 8, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", 0x0, 0, 0 },
- { "zfs", "zfs", 8, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", 0x0, 0, 0 },
- { "ufs", "ufs", 8, 0x55c, 4, "T\031\001\000", 0, 0, 0 },
- { "swap", "swap", 0, 0x1ff6, 10, "SWAP-SPACE", 0x40c, 0, 0 },
- { "swap", "swap", 0, 0x1ff6, 10, "SWAPSPACE2", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0x1ff6, 9, "ULSUSPEND", 0x40c, 0, 0 },
- { "reiserfs", "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", 0x10054, 0, 0 },
- { "reiserfs", "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", 0x10054, 0, 0 },
- { "reiserfs", "reiserfs", 64, 0x34, 8, "ReIsErFs", 0x10054, 0, 0 },
- { "reiser4", "reiser4", 64, 0, 7, "ReIsEr4", 0x100544, 0, 0 },
- { "gfs2", "gfs2", 64, 0, 4, "\x01\x16\x19\x70", 0x0, 0, 0 },
- { "gfs", "gfs", 64, 0, 4, "\x01\x16\x19\x70", 0x0, 0, 0 },
- { "btrfs", "btrfs", 64, 0x40, 8, "_BHRfS_M", 0x0, 0, 0 },
- { "swap", "swap", 0, 0x3ff6, 10, "SWAP-SPACE", 0x40c, 0, 0 },
- { "swap", "swap", 0, 0x3ff6, 10, "SWAPSPACE2", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0x3ff6, 9, "ULSUSPEND", 0x40c, 0, 0 },
- { "udf", "udf", 32, 1, 5, "BEA01", 0x0, 0, 0 },
- { "udf", "udf", 32, 1, 5, "BOOT2", 0x0, 0, 0 },
- { "udf", "udf", 32, 1, 5, "CD001", 0x0, 0, 0 },
- { "udf", "udf", 32, 1, 5, "CDW02", 0x0, 0, 0 },
- { "udf", "udf", 32, 1, 5, "NSR02", 0x0, 0, 0 },
- { "udf", "udf", 32, 1, 5, "NSR03", 0x0, 0, 0 },
- { "udf", "udf", 32, 1, 5, "TEA01", 0x0, 0, 0 },
- { "iso9660", "iso9660", 32, 1, 5, "CD001", 0x0, 0, 0 },
- { "iso9660", "iso9660", 32, 9, 5, "CDROM", 0x0, 0, 0 },
- { "jfs", "jfs", 32, 0, 4, "JFS1", 0x88, 0, 0 },
- { "swap", "swap", 0, 0x7ff6, 10, "SWAP-SPACE", 0x40c, 0, 0 },
- { "swap", "swap", 0, 0x7ff6, 10, "SWAPSPACE2", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0x7ff6, 9, "ULSUSPEND", 0x40c, 0, 0 },
- { "swap", "swap", 0, 0xfff6, 10, "SWAP-SPACE", 0x40c, 0, 0 },
- { "swap", "swap", 0, 0xfff6, 10, "SWAPSPACE2", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", 0x40c, 0, 0 },
- { "swap", "swsuspend", 0, 0xfff6, 9, "ULSUSPEND", 0x40c, 0, 0 },
- { "zfs", "zfs", 264, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", 0x0, 0, 0 },
- { "zfs", "zfs", 264, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", 0x0, 0, 0 },
- { NULL, NULL, 0, 0, 0, NULL, 0x0, 0, 0 }
-};
-
-static int null_uuid(const char *uuid)
-{
- int i;
-
- for (i = 0; i < 16 && !uuid[i]; i++);
-
- return (i == 16);
-}
-
-
-static void uuid_end_bio(struct bio *bio)
-{
- struct page *page = bio->bi_io_vec[0].bv_page;
-
- if (bio->bi_error)
- SetPageError(page);
-
- unlock_page(page);
- bio_put(bio);
-}
-
-
-/**
- * read_bdev_page - Read a page from a device.
- * @dev: The block device we're using.
- * @page_num: The page we're reading.
- *
- * Based on Patrick Mochell's pmdisk code from long ago: "Straight from the
- * textbook - allocate and initialize the bio. If we're writing, make sure
- * the page is marked as dirty. Then submit it and carry on."
- **/
-static struct page *read_bdev_page(struct block_device *dev, int page_num)
-{
- struct bio *bio = NULL;
- struct page *page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
-
- if (!page) {
- printk(KERN_ERR "Failed to allocate a page for reading data "
- "in UUID checks.");
- return NULL;
- }
-
- bio = bio_alloc(GFP_NOFS, 1);
- bio->bi_bdev = dev;
- bio->bi_iter.bi_sector = page_num << 3;
- bio->bi_end_io = uuid_end_bio;
- bio->bi_flags |= (1 << BIO_TOI);
-
- PRINTK("Submitting bio on device %lx, page %d using bio %p and page %p.\n",
- (unsigned long) dev->bd_dev, page_num, bio, page);
-
- if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
- printk(KERN_DEBUG "ERROR: adding page to bio at %d\n",
- page_num);
- bio_put(bio);
- __free_page(page);
- printk(KERN_DEBUG "read_bdev_page freed page %p (in error "
- "path).\n", page);
- return NULL;
- }
-
- lock_page(page);
- submit_bio(READ | REQ_SYNC, bio);
-
- wait_on_page_locked(page);
- if (PageError(page)) {
- __free_page(page);
- page = NULL;
- }
- return page;
-}
-
-int bdev_matches_key(struct block_device *bdev, const char *key)
-{
- unsigned char *data = NULL;
- struct page *data_page = NULL;
-
- int dev_offset, pg_num, pg_off, i;
- int last_pg_num = -1;
- int result = 0;
- char buf[50];
-
- if (null_uuid(key)) {
- PRINTK("Refusing to find a NULL key.\n");
- return 0;
- }
-
- if (!bdev->bd_disk) {
- bdevname(bdev, buf);
- PRINTK("bdev %s has no bd_disk.\n", buf);
- return 0;
- }
-
- if (!bdev->bd_disk->queue) {
- bdevname(bdev, buf);
- PRINTK("bdev %s has no queue.\n", buf);
- return 0;
- }
-
- for (i = 0; uuid_list[i].name; i++) {
- struct uuid_info *dat = &uuid_list[i];
-
- if (!dat->key || strcmp(dat->key, key))
- continue;
-
- dev_offset = (dat->bkoff << 10) + dat->sboff;
- pg_num = dev_offset >> 12;
- pg_off = dev_offset & 0xfff;
-
- if ((((pg_num + 1) << 3) - 1) > bdev->bd_part->nr_sects >> 1)
- continue;
-
- if (pg_num != last_pg_num) {
- if (data_page) {
- kunmap(data_page);
- __free_page(data_page);
- }
- data_page = read_bdev_page(bdev, pg_num);
- if (!data_page)
- continue;
- data = kmap(data_page);
- }
-
- last_pg_num = pg_num;
-
- if (strncmp(&data[pg_off], dat->magic, dat->sig_len))
- continue;
-
- result = 1;
- break;
- }
-
- if (data_page) {
- kunmap(data_page);
- __free_page(data_page);
- }
-
- return result;
-}
-
-/*
- * part_matches_fs_info - Does the given partition match the details given?
- *
- * Returns a score saying how good the match is.
- * 0 = no UUID match.
- * 1 = UUID but last mount time differs.
- * 2 = UUID, last mount time but not dev_t
- * 3 = perfect match
- *
- * This lets us cope elegantly with probing resulting in dev_ts changing
- * from boot to boot, and with the case where a user copies a partition
- * (UUID is non unique), and we need to check the last mount time of the
- * correct partition.
- */
-int part_matches_fs_info(struct hd_struct *part, struct fs_info *seek)
-{
- struct block_device *bdev;
- struct fs_info *got;
- int result = 0;
- char buf[50];
-
- if (null_uuid((char *) &seek->uuid)) {
- PRINTK("Refusing to find a NULL uuid.\n");
- return 0;
- }
-
- bdev = bdget(part_devt(part));
-
- PRINTK("part_matches fs info considering %x.\n", part_devt(part));
-
- if (blkdev_get(bdev, FMODE_READ, 0)) {
- PRINTK("blkdev_get failed.\n");
- return 0;
- }
-
- if (!bdev->bd_disk) {
- bdevname(bdev, buf);
- PRINTK("bdev %s has no bd_disk.\n", buf);
- goto out;
- }
-
- if (!bdev->bd_disk->queue) {
- bdevname(bdev, buf);
- PRINTK("bdev %s has no queue.\n", buf);
- goto out;
- }
-
- got = fs_info_from_block_dev(bdev);
-
- if (got && !memcmp(got->uuid, seek->uuid, 16)) {
- PRINTK(" Have matching UUID.\n");
- PRINTK(" Got: LMS %d, LM %p.\n", got->last_mount_size, got->last_mount);
- PRINTK(" Seek: LMS %d, LM %p.\n", seek->last_mount_size, seek->last_mount);
- result = 1;
-
- if (got->last_mount_size == seek->last_mount_size &&
- got->last_mount && seek->last_mount &&
- !memcmp(got->last_mount, seek->last_mount,
- got->last_mount_size)) {
- result = 2;
-
- PRINTK(" Matching last mount time.\n");
-
- if (part_devt(part) == seek->dev_t) {
- result = 3;
- PRINTK(" Matching dev_t.\n");
- } else
- PRINTK("Dev_ts differ (%x vs %x).\n", part_devt(part), seek->dev_t);
- }
- }
-
- PRINTK(" Score for %x is %d.\n", part_devt(part), result);
- free_fs_info(got);
-out:
- blkdev_put(bdev, FMODE_READ);
- return result;
-}
-
-void free_fs_info(struct fs_info *fs_info)
-{
- if (!fs_info || IS_ERR(fs_info))
- return;
-
- if (fs_info->last_mount)
- kfree(fs_info->last_mount);
-
- kfree(fs_info);
-}
-
-struct fs_info *fs_info_from_block_dev(struct block_device *bdev)
-{
- unsigned char *data = NULL;
- struct page *data_page = NULL;
-
- int dev_offset, pg_num, pg_off;
- int uuid_pg_num, uuid_pg_off, i;
- unsigned char *uuid_data = NULL;
- struct page *uuid_data_page = NULL;
-
- int last_pg_num = -1, last_uuid_pg_num = 0;
- char buf[50];
- struct fs_info *fs_info = NULL;
-
- bdevname(bdev, buf);
-
- PRINTK("uuid_from_block_dev looking for partition type of %s.\n", buf);
-
- for (i = 0; uuid_list[i].name; i++) {
- struct uuid_info *dat = &uuid_list[i];
- dev_offset = (dat->bkoff << 10) + dat->sboff;
- pg_num = dev_offset >> 12;
- pg_off = dev_offset & 0xfff;
- uuid_pg_num = dat->uuid_offset >> 12;
- uuid_pg_off = dat->uuid_offset & 0xfff;
-
- if ((((pg_num + 1) << 3) - 1) > bdev->bd_part->nr_sects >> 1)
- continue;
-
- /* Ignore partition types with no UUID offset */
- if (!dat->uuid_offset)
- continue;
-
- if (pg_num != last_pg_num) {
- if (data_page) {
- kunmap(data_page);
- __free_page(data_page);
- }
- data_page = read_bdev_page(bdev, pg_num);
- if (!data_page)
- continue;
- data = kmap(data_page);
- }
-
- last_pg_num = pg_num;
-
- if (strncmp(&data[pg_off], dat->magic, dat->sig_len))
- continue;
-
- PRINTK("This partition looks like %s.\n", dat->name);
-
- fs_info = kzalloc(sizeof(struct fs_info), GFP_KERNEL);
-
- if (!fs_info) {
- PRINTK("Failed to allocate fs_info struct.");
- fs_info = ERR_PTR(-ENOMEM);
- break;
- }
-
- /* UUID can't be off the end of the disk */
- if ((uuid_pg_num > bdev->bd_part->nr_sects >> 3) ||
- !dat->uuid_offset)
- goto no_uuid;
-
- if (!uuid_data || uuid_pg_num != last_uuid_pg_num) {
- /* No need to reread the page from above */
- if (uuid_pg_num == pg_num && uuid_data)
- memcpy(uuid_data, data, PAGE_SIZE);
- else {
- if (uuid_data_page) {
- kunmap(uuid_data_page);
- __free_page(uuid_data_page);
- }
- uuid_data_page = read_bdev_page(bdev, uuid_pg_num);
- if (!uuid_data_page)
- continue;
- uuid_data = kmap(uuid_data_page);
- }
- }
-
- last_uuid_pg_num = uuid_pg_num;
- memcpy(&fs_info->uuid, &uuid_data[uuid_pg_off], 16);
- fs_info->dev_t = bdev->bd_dev;
-
-no_uuid:
- PRINT_HEX_DUMP(KERN_EMERG, "fs_info_from_block_dev "
- "returning uuid ", DUMP_PREFIX_NONE, 16, 1,
- fs_info->uuid, 16, 0);
-
- if (dat->last_mount_size) {
- int pg = dat->last_mount_offset >> 12, sz;
- int off = dat->last_mount_offset & 0xfff;
- struct page *last_mount = read_bdev_page(bdev, pg);
- unsigned char *last_mount_data;
- char *ptr;
-
- if (!last_mount) {
- fs_info = ERR_PTR(-ENOMEM);
- break;
- }
- last_mount_data = kmap(last_mount);
- sz = dat->last_mount_size;
- ptr = kmalloc(sz, GFP_KERNEL);
-
- if (!ptr) {
- printk(KERN_EMERG "fs_info_from_block_dev "
- "failed to get memory for last mount "
- "timestamp.");
- free_fs_info(fs_info);
- fs_info = ERR_PTR(-ENOMEM);
- } else {
- fs_info->last_mount = ptr;
- fs_info->last_mount_size = sz;
- memcpy(ptr, &last_mount_data[off], sz);
- }
-
- kunmap(last_mount);
- __free_page(last_mount);
- }
- break;
- }
-
- if (data_page) {
- kunmap(data_page);
- __free_page(data_page);
- }
-
- if (uuid_data_page) {
- kunmap(uuid_data_page);
- __free_page(uuid_data_page);
- }
-
- return fs_info;
-}
-
-static int __init uuid_debug_setup(char *str)
-{
- int value;
-
- if (sscanf(str, "=%d", &value))
- debug_enabled = value;
-
- return 1;
-}
-
-__setup("uuid_debug", uuid_debug_setup);
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-06 02:13:00 +0000