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@@ -0,0 +1,3085 @@
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+/*
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+ * Copyright (C) 2016-2017 Red Hat, Inc. All rights reserved.
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+ * Copyright (C) 2016-2017 Milan Broz
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+ * Copyright (C) 2016-2017 Mikulas Patocka
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+ *
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+ * This file is released under the GPL.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/device-mapper.h>
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+#include <linux/dm-io.h>
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+#include <linux/vmalloc.h>
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+#include <linux/sort.h>
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+#include <linux/rbtree.h>
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+#include <linux/delay.h>
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+#include <linux/random.h>
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+#include <crypto/hash.h>
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+#include <crypto/skcipher.h>
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+#include <linux/async_tx.h>
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+#include "dm-bufio.h"
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+
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+#define DM_MSG_PREFIX "integrity"
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+
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+#define DEFAULT_INTERLEAVE_SECTORS 32768
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+#define DEFAULT_JOURNAL_SIZE_FACTOR 7
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+#define DEFAULT_BUFFER_SECTORS 128
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+#define DEFAULT_JOURNAL_WATERMARK 50
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+#define DEFAULT_SYNC_MSEC 10000
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+#define DEFAULT_MAX_JOURNAL_SECTORS 131072
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+#define MIN_INTERLEAVE_SECTORS 3
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+#define MAX_INTERLEAVE_SECTORS 31
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+#define METADATA_WORKQUEUE_MAX_ACTIVE 16
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+
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+/*
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+ * Warning - DEBUG_PRINT prints security-sensitive data to the log,
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+ * so it should not be enabled in the official kernel
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+ */
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+//#define DEBUG_PRINT
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+//#define INTERNAL_VERIFY
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+
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+/*
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+ * On disk structures
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+ */
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+
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+#define SB_MAGIC "integrt"
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+#define SB_VERSION 1
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+#define SB_SECTORS 8
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+
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+struct superblock {
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+ __u8 magic[8];
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+ __u8 version;
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+ __u8 log2_interleave_sectors;
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+ __u16 integrity_tag_size;
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+ __u32 journal_sections;
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+ __u64 provided_data_sectors; /* userspace uses this value */
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+ __u32 flags;
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+};
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+
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+#define SB_FLAG_HAVE_JOURNAL_MAC 0x1
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+
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+#define JOURNAL_ENTRY_ROUNDUP 8
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+
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+typedef __u64 commit_id_t;
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+#define JOURNAL_MAC_PER_SECTOR 8
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+
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+struct journal_entry {
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+ union {
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+ struct {
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+ __u32 sector_lo;
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+ __u32 sector_hi;
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+ } s;
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+ __u64 sector;
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+ } u;
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+ commit_id_t last_bytes;
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+ __u8 tag[0];
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+};
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+
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+#if BITS_PER_LONG == 64
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+#define journal_entry_set_sector(je, x) do { smp_wmb(); ACCESS_ONCE((je)->u.sector) = cpu_to_le64(x); } while (0)
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+#define journal_entry_get_sector(je) le64_to_cpu((je)->u.sector)
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+#elif defined(CONFIG_LBDAF)
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+#define journal_entry_set_sector(je, x) do { (je)->u.s.sector_lo = cpu_to_le32(x); smp_wmb(); ACCESS_ONCE((je)->u.s.sector_hi) = cpu_to_le32((x) >> 32); } while (0)
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+#define journal_entry_get_sector(je) le64_to_cpu((je)->u.sector)
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+#else
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+#define journal_entry_set_sector(je, x) do { (je)->u.s.sector_lo = cpu_to_le32(x); smp_wmb(); ACCESS_ONCE((je)->u.s.sector_hi) = cpu_to_le32(0); } while (0)
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+#define journal_entry_get_sector(je) le32_to_cpu((je)->u.s.sector_lo)
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+#endif
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+#define journal_entry_is_unused(je) ((je)->u.s.sector_hi == cpu_to_le32(-1))
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+#define journal_entry_set_unused(je) do { ((je)->u.s.sector_hi = cpu_to_le32(-1)); } while (0)
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+#define journal_entry_is_inprogress(je) ((je)->u.s.sector_hi == cpu_to_le32(-2))
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+#define journal_entry_set_inprogress(je) do { ((je)->u.s.sector_hi = cpu_to_le32(-2)); } while (0)
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+
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+#define JOURNAL_BLOCK_SECTORS 8
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+#define JOURNAL_SECTOR_DATA ((1 << SECTOR_SHIFT) - sizeof(commit_id_t))
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+#define JOURNAL_MAC_SIZE (JOURNAL_MAC_PER_SECTOR * JOURNAL_BLOCK_SECTORS)
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+
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+struct journal_sector {
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+ __u8 entries[JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR];
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+ __u8 mac[JOURNAL_MAC_PER_SECTOR];
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+ commit_id_t commit_id;
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+};
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+
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+#define MAX_TAG_SIZE (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, tag))
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+
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+#define METADATA_PADDING_SECTORS 8
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+
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+#define N_COMMIT_IDS 4
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+
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+static unsigned char prev_commit_seq(unsigned char seq)
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+{
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+ return (seq + N_COMMIT_IDS - 1) % N_COMMIT_IDS;
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+}
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+
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+static unsigned char next_commit_seq(unsigned char seq)
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+{
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+ return (seq + 1) % N_COMMIT_IDS;
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+}
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+
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+/*
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+ * In-memory structures
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+ */
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+
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+struct journal_node {
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+ struct rb_node node;
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+ sector_t sector;
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+};
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+
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+struct alg_spec {
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+ char *alg_string;
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+ char *key_string;
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+ __u8 *key;
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+ unsigned key_size;
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+};
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+
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+struct dm_integrity_c {
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+ struct dm_dev *dev;
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+ unsigned tag_size;
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+ __s8 log2_tag_size;
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+ sector_t start;
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+ mempool_t *journal_io_mempool;
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+ struct dm_io_client *io;
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+ struct dm_bufio_client *bufio;
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+ struct workqueue_struct *metadata_wq;
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+ struct superblock *sb;
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+ unsigned journal_pages;
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+ struct page_list *journal;
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+ struct page_list *journal_io;
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+ struct page_list *journal_xor;
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+
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+ struct crypto_skcipher *journal_crypt;
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+ struct scatterlist **journal_scatterlist;
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+ struct scatterlist **journal_io_scatterlist;
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+ struct skcipher_request **sk_requests;
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+
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+ struct crypto_shash *journal_mac;
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+
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+ struct journal_node *journal_tree;
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+ struct rb_root journal_tree_root;
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+
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+ sector_t provided_data_sectors;
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+
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+ unsigned short journal_entry_size;
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+ unsigned char journal_entries_per_sector;
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+ unsigned char journal_section_entries;
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+ unsigned char journal_section_sectors;
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+ unsigned journal_sections;
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+ unsigned journal_entries;
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+ sector_t device_sectors;
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+ unsigned initial_sectors;
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+ unsigned metadata_run;
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+ __s8 log2_metadata_run;
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+ __u8 log2_buffer_sectors;
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+
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+ unsigned char mode;
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+ bool suspending;
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+
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+ int failed;
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+
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+ struct crypto_shash *internal_hash;
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+
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+ /* these variables are locked with endio_wait.lock */
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+ struct rb_root in_progress;
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+ wait_queue_head_t endio_wait;
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+ struct workqueue_struct *wait_wq;
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+
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+ unsigned char commit_seq;
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+ commit_id_t commit_ids[N_COMMIT_IDS];
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+
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+ unsigned committed_section;
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+ unsigned n_committed_sections;
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+
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+ unsigned uncommitted_section;
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+ unsigned n_uncommitted_sections;
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+
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+ unsigned free_section;
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+ unsigned char free_section_entry;
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+ unsigned free_sectors;
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+
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+ unsigned free_sectors_threshold;
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+
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+ struct workqueue_struct *commit_wq;
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+ struct work_struct commit_work;
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+
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+ struct workqueue_struct *writer_wq;
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+ struct work_struct writer_work;
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+
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+ struct bio_list flush_bio_list;
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+
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+ unsigned long autocommit_jiffies;
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+ struct timer_list autocommit_timer;
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+ unsigned autocommit_msec;
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+
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+ wait_queue_head_t copy_to_journal_wait;
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+
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+ struct completion crypto_backoff;
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+
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+ bool journal_uptodate;
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+ bool just_formatted;
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+
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+ struct alg_spec internal_hash_alg;
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+ struct alg_spec journal_crypt_alg;
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+ struct alg_spec journal_mac_alg;
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+};
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+
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+struct dm_integrity_range {
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+ sector_t logical_sector;
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+ unsigned n_sectors;
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+ struct rb_node node;
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+};
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+
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+struct dm_integrity_io {
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+ struct work_struct work;
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+
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+ struct dm_integrity_c *ic;
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+ bool write;
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+ bool fua;
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+
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+ struct dm_integrity_range range;
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+
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+ sector_t metadata_block;
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+ unsigned metadata_offset;
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+
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+ atomic_t in_flight;
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+ int bi_error;
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+
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+ struct completion *completion;
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+
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+ struct block_device *orig_bi_bdev;
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+ bio_end_io_t *orig_bi_end_io;
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+ struct bio_integrity_payload *orig_bi_integrity;
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+ struct bvec_iter orig_bi_iter;
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+};
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+
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+struct journal_completion {
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+ struct dm_integrity_c *ic;
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+ atomic_t in_flight;
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+ struct completion comp;
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+};
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+
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+struct journal_io {
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+ struct dm_integrity_range range;
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+ struct journal_completion *comp;
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+};
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+
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+static struct kmem_cache *journal_io_cache;
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+
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+#define JOURNAL_IO_MEMPOOL 32
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+
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+#ifdef DEBUG_PRINT
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+#define DEBUG_print(x, ...) printk(KERN_DEBUG x, ##__VA_ARGS__)
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+static void __DEBUG_bytes(__u8 *bytes, size_t len, const char *msg, ...)
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+{
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+ va_list args;
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+ va_start(args, msg);
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+ vprintk(msg, args);
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+ va_end(args);
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+ if (len)
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+ pr_cont(":");
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+ while (len) {
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+ pr_cont(" %02x", *bytes);
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+ bytes++;
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+ len--;
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+ }
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+ pr_cont("\n");
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+}
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+#define DEBUG_bytes(bytes, len, msg, ...) __DEBUG_bytes(bytes, len, KERN_DEBUG msg, ##__VA_ARGS__)
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+#else
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+#define DEBUG_print(x, ...) do { } while (0)
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+#define DEBUG_bytes(bytes, len, msg, ...) do { } while (0)
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+#endif
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+
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+/*
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+ * DM Integrity profile, protection is performed layer above (dm-crypt)
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+ */
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+static struct blk_integrity_profile dm_integrity_profile = {
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+ .name = "DM-DIF-EXT-TAG",
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+ .generate_fn = NULL,
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+ .verify_fn = NULL,
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+};
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+
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+static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map);
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+static void integrity_bio_wait(struct work_struct *w);
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+static void dm_integrity_dtr(struct dm_target *ti);
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+
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+static void dm_integrity_io_error(struct dm_integrity_c *ic, const char *msg, int err)
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+{
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+ if (!cmpxchg(&ic->failed, 0, err))
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+ DMERR("Error on %s: %d", msg, err);
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+}
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+
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+static int dm_integrity_failed(struct dm_integrity_c *ic)
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+{
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+ return ACCESS_ONCE(ic->failed);
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+}
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+
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+static commit_id_t dm_integrity_commit_id(struct dm_integrity_c *ic, unsigned i,
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+ unsigned j, unsigned char seq)
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+{
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+ /*
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+ * Xor the number with section and sector, so that if a piece of
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+ * journal is written at wrong place, it is detected.
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+ */
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+ return ic->commit_ids[seq] ^ cpu_to_le64(((__u64)i << 32) ^ j);
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+}
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+
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+static void get_area_and_offset(struct dm_integrity_c *ic, sector_t data_sector,
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+ sector_t *area, sector_t *offset)
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+{
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+ __u8 log2_interleave_sectors = ic->sb->log2_interleave_sectors;
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+
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+ *area = data_sector >> log2_interleave_sectors;
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+ *offset = (unsigned)data_sector & ((1U << log2_interleave_sectors) - 1);
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+}
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+
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+static __u64 get_metadata_sector_and_offset(struct dm_integrity_c *ic, sector_t area,
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+ sector_t offset, unsigned *metadata_offset)
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+{
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+ __u64 ms;
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+ unsigned mo;
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+
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+ ms = area << ic->sb->log2_interleave_sectors;
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+ if (likely(ic->log2_metadata_run >= 0))
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+ ms += area << ic->log2_metadata_run;
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+ else
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+ ms += area * ic->metadata_run;
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+ ms >>= ic->log2_buffer_sectors;
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+
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+ if (likely(ic->log2_tag_size >= 0)) {
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+ ms += offset >> (SECTOR_SHIFT + ic->log2_buffer_sectors - ic->log2_tag_size);
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+ mo = (offset << ic->log2_tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
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+ } else {
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+ ms += (__u64)offset * ic->tag_size >> (SECTOR_SHIFT + ic->log2_buffer_sectors);
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+ mo = (offset * ic->tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
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+ }
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+ *metadata_offset = mo;
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+ return ms;
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+}
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+
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+static sector_t get_data_sector(struct dm_integrity_c *ic, sector_t area, sector_t offset)
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+{
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+ sector_t result;
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+
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+ result = area << ic->sb->log2_interleave_sectors;
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+ if (likely(ic->log2_metadata_run >= 0))
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+ result += (area + 1) << ic->log2_metadata_run;
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+ else
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+ result += (area + 1) * ic->metadata_run;
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+
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+ result += (sector_t)ic->initial_sectors + offset;
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+ return result;
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+}
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+
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+static void wraparound_section(struct dm_integrity_c *ic, unsigned *sec_ptr)
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+{
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+ if (unlikely(*sec_ptr >= ic->journal_sections))
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+ *sec_ptr -= ic->journal_sections;
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+}
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+
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+static int sync_rw_sb(struct dm_integrity_c *ic, int op, int op_flags)
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+{
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+ struct dm_io_request io_req;
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+ struct dm_io_region io_loc;
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+
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+ io_req.bi_op = op;
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+ io_req.bi_op_flags = op_flags;
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+ io_req.mem.type = DM_IO_KMEM;
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+ io_req.mem.ptr.addr = ic->sb;
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+ io_req.notify.fn = NULL;
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+ io_req.client = ic->io;
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+ io_loc.bdev = ic->dev->bdev;
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+ io_loc.sector = ic->start;
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+ io_loc.count = SB_SECTORS;
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+
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+ return dm_io(&io_req, 1, &io_loc, NULL);
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+}
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+
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+static void access_journal_check(struct dm_integrity_c *ic, unsigned section, unsigned offset,
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+ bool e, const char *function)
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+{
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|
+#if defined(CONFIG_DM_DEBUG) || defined(INTERNAL_VERIFY)
|
|
|
+ unsigned limit = e ? ic->journal_section_entries : ic->journal_section_sectors;
|
|
|
+
|
|
|
+ if (unlikely(section >= ic->journal_sections) ||
|
|
|
+ unlikely(offset >= limit)) {
|
|
|
+ printk(KERN_CRIT "%s: invalid access at (%u,%u), limit (%u,%u)\n",
|
|
|
+ function, section, offset, ic->journal_sections, limit);
|
|
|
+ BUG();
|
|
|
+ }
|
|
|
+#endif
|
|
|
+}
|
|
|
+
|
|
|
+static void page_list_location(struct dm_integrity_c *ic, unsigned section, unsigned offset,
|
|
|
+ unsigned *pl_index, unsigned *pl_offset)
|
|
|
+{
|
|
|
+ unsigned sector;
|
|
|
+
|
|
|
+ access_journal_check(ic, section, offset, false, "access_journal");
|
|
|
+
|
|
|
+ sector = section * ic->journal_section_sectors + offset;
|
|
|
+
|
|
|
+ *pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
|
|
|
+ *pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
|
|
|
+}
|
|
|
+
|
|
|
+static struct journal_sector *access_page_list(struct dm_integrity_c *ic, struct page_list *pl,
|
|
|
+ unsigned section, unsigned offset, unsigned *n_sectors)
|
|
|
+{
|
|
|
+ unsigned pl_index, pl_offset;
|
|
|
+ char *va;
|
|
|
+
|
|
|
+ page_list_location(ic, section, offset, &pl_index, &pl_offset);
|
|
|
+
|
|
|
+ if (n_sectors)
|
|
|
+ *n_sectors = (PAGE_SIZE - pl_offset) >> SECTOR_SHIFT;
|
|
|
+
|
|
|
+ va = lowmem_page_address(pl[pl_index].page);
|
|
|
+
|
|
|
+ return (struct journal_sector *)(va + pl_offset);
|
|
|
+}
|
|
|
+
|
|
|
+static struct journal_sector *access_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset)
|
|
|
+{
|
|
|
+ return access_page_list(ic, ic->journal, section, offset, NULL);
|
|
|
+}
|
|
|
+
|
|
|
+static struct journal_entry *access_journal_entry(struct dm_integrity_c *ic, unsigned section, unsigned n)
|
|
|
+{
|
|
|
+ unsigned rel_sector, offset;
|
|
|
+ struct journal_sector *js;
|
|
|
+
|
|
|
+ access_journal_check(ic, section, n, true, "access_journal_entry");
|
|
|
+
|
|
|
+ rel_sector = n % JOURNAL_BLOCK_SECTORS;
|
|
|
+ offset = n / JOURNAL_BLOCK_SECTORS;
|
|
|
+
|
|
|
+ js = access_journal(ic, section, rel_sector);
|
|
|
+ return (struct journal_entry *)((char *)js + offset * ic->journal_entry_size);
|
|
|
+}
|
|
|
+
|
|
|
+static struct journal_sector *access_journal_data(struct dm_integrity_c *ic, unsigned section, unsigned n)
|
|
|
+{
|
|
|
+ access_journal_check(ic, section, n, true, "access_journal_data");
|
|
|
+
|
|
|
+ return access_journal(ic, section, n + JOURNAL_BLOCK_SECTORS);
|
|
|
+}
|
|
|
+
|
|
|
+static void section_mac(struct dm_integrity_c *ic, unsigned section, __u8 result[JOURNAL_MAC_SIZE])
|
|
|
+{
|
|
|
+ SHASH_DESC_ON_STACK(desc, ic->journal_mac);
|
|
|
+ int r;
|
|
|
+ unsigned j, size;
|
|
|
+
|
|
|
+ desc->tfm = ic->journal_mac;
|
|
|
+ desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
|
|
|
+
|
|
|
+ r = crypto_shash_init(desc);
|
|
|
+ if (unlikely(r)) {
|
|
|
+ dm_integrity_io_error(ic, "crypto_shash_init", r);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ for (j = 0; j < ic->journal_section_entries; j++) {
|
|
|
+ struct journal_entry *je = access_journal_entry(ic, section, j);
|
|
|
+ r = crypto_shash_update(desc, (__u8 *)&je->u.sector, sizeof je->u.sector);
|
|
|
+ if (unlikely(r)) {
|
|
|
+ dm_integrity_io_error(ic, "crypto_shash_update", r);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ size = crypto_shash_digestsize(ic->journal_mac);
|
|
|
+
|
|
|
+ if (likely(size <= JOURNAL_MAC_SIZE)) {
|
|
|
+ r = crypto_shash_final(desc, result);
|
|
|
+ if (unlikely(r)) {
|
|
|
+ dm_integrity_io_error(ic, "crypto_shash_final", r);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+ memset(result + size, 0, JOURNAL_MAC_SIZE - size);
|
|
|
+ } else {
|
|
|
+ __u8 digest[size];
|
|
|
+ r = crypto_shash_final(desc, digest);
|
|
|
+ if (unlikely(r)) {
|
|
|
+ dm_integrity_io_error(ic, "crypto_shash_final", r);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+ memcpy(result, digest, JOURNAL_MAC_SIZE);
|
|
|
+ }
|
|
|
+
|
|
|
+ return;
|
|
|
+err:
|
|
|
+ memset(result, 0, JOURNAL_MAC_SIZE);
|
|
|
+}
|
|
|
+
|
|
|
+static void rw_section_mac(struct dm_integrity_c *ic, unsigned section, bool wr)
|
|
|
+{
|
|
|
+ __u8 result[JOURNAL_MAC_SIZE];
|
|
|
+ unsigned j;
|
|
|
+
|
|
|
+ if (!ic->journal_mac)
|
|
|
+ return;
|
|
|
+
|
|
|
+ section_mac(ic, section, result);
|
|
|
+
|
|
|
+ for (j = 0; j < JOURNAL_BLOCK_SECTORS; j++) {
|
|
|
+ struct journal_sector *js = access_journal(ic, section, j);
|
|
|
+
|
|
|
+ if (likely(wr))
|
|
|
+ memcpy(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR);
|
|
|
+ else {
|
|
|
+ if (memcmp(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR))
|
|
|
+ dm_integrity_io_error(ic, "journal mac", -EILSEQ);
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void complete_journal_op(void *context)
|
|
|
+{
|
|
|
+ struct journal_completion *comp = context;
|
|
|
+ BUG_ON(!atomic_read(&comp->in_flight));
|
|
|
+ if (likely(atomic_dec_and_test(&comp->in_flight)))
|
|
|
+ complete(&comp->comp);
|
|
|
+}
|
|
|
+
|
|
|
+static void xor_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
|
|
|
+ unsigned n_sections, struct journal_completion *comp)
|
|
|
+{
|
|
|
+ struct async_submit_ctl submit;
|
|
|
+ size_t n_bytes = (size_t)(n_sections * ic->journal_section_sectors) << SECTOR_SHIFT;
|
|
|
+ unsigned pl_index, pl_offset, section_index;
|
|
|
+ struct page_list *source_pl, *target_pl;
|
|
|
+
|
|
|
+ if (likely(encrypt)) {
|
|
|
+ source_pl = ic->journal;
|
|
|
+ target_pl = ic->journal_io;
|
|
|
+ } else {
|
|
|
+ source_pl = ic->journal_io;
|
|
|
+ target_pl = ic->journal;
|
|
|
+ }
|
|
|
+
|
|
|
+ page_list_location(ic, section, 0, &pl_index, &pl_offset);
|
|
|
+
|
|
|
+ atomic_add(roundup(pl_offset + n_bytes, PAGE_SIZE) >> PAGE_SHIFT, &comp->in_flight);
|
|
|
+
|
|
|
+ init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, complete_journal_op, comp, NULL);
|
|
|
+
|
|
|
+ section_index = pl_index;
|
|
|
+
|
|
|
+ do {
|
|
|
+ size_t this_step;
|
|
|
+ struct page *src_pages[2];
|
|
|
+ struct page *dst_page;
|
|
|
+
|
|
|
+ while (unlikely(pl_index == section_index)) {
|
|
|
+ unsigned dummy;
|
|
|
+ if (likely(encrypt))
|
|
|
+ rw_section_mac(ic, section, true);
|
|
|
+ section++;
|
|
|
+ n_sections--;
|
|
|
+ if (!n_sections)
|
|
|
+ break;
|
|
|
+ page_list_location(ic, section, 0, §ion_index, &dummy);
|
|
|
+ }
|
|
|
+
|
|
|
+ this_step = min(n_bytes, (size_t)PAGE_SIZE - pl_offset);
|
|
|
+ dst_page = target_pl[pl_index].page;
|
|
|
+ src_pages[0] = source_pl[pl_index].page;
|
|
|
+ src_pages[1] = ic->journal_xor[pl_index].page;
|
|
|
+
|
|
|
+ async_xor(dst_page, src_pages, pl_offset, 2, this_step, &submit);
|
|
|
+
|
|
|
+ pl_index++;
|
|
|
+ pl_offset = 0;
|
|
|
+ n_bytes -= this_step;
|
|
|
+ } while (n_bytes);
|
|
|
+
|
|
|
+ BUG_ON(n_sections);
|
|
|
+
|
|
|
+ async_tx_issue_pending_all();
|
|
|
+}
|
|
|
+
|
|
|
+static void complete_journal_encrypt(struct crypto_async_request *req, int err)
|
|
|
+{
|
|
|
+ struct journal_completion *comp = req->data;
|
|
|
+ if (unlikely(err)) {
|
|
|
+ if (likely(err == -EINPROGRESS)) {
|
|
|
+ complete(&comp->ic->crypto_backoff);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ dm_integrity_io_error(comp->ic, "asynchronous encrypt", err);
|
|
|
+ }
|
|
|
+ complete_journal_op(comp);
|
|
|
+}
|
|
|
+
|
|
|
+static bool do_crypt(bool encrypt, struct skcipher_request *req, struct journal_completion *comp)
|
|
|
+{
|
|
|
+ int r;
|
|
|
+ skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
|
|
|
+ complete_journal_encrypt, comp);
|
|
|
+ if (likely(encrypt))
|
|
|
+ r = crypto_skcipher_encrypt(req);
|
|
|
+ else
|
|
|
+ r = crypto_skcipher_decrypt(req);
|
|
|
+ if (likely(!r))
|
|
|
+ return false;
|
|
|
+ if (likely(r == -EINPROGRESS))
|
|
|
+ return true;
|
|
|
+ if (likely(r == -EBUSY)) {
|
|
|
+ wait_for_completion(&comp->ic->crypto_backoff);
|
|
|
+ reinit_completion(&comp->ic->crypto_backoff);
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+ dm_integrity_io_error(comp->ic, "encrypt", r);
|
|
|
+ return false;
|
|
|
+}
|
|
|
+
|
|
|
+static void crypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
|
|
|
+ unsigned n_sections, struct journal_completion *comp)
|
|
|
+{
|
|
|
+ struct scatterlist **source_sg;
|
|
|
+ struct scatterlist **target_sg;
|
|
|
+
|
|
|
+ atomic_add(2, &comp->in_flight);
|
|
|
+
|
|
|
+ if (likely(encrypt)) {
|
|
|
+ source_sg = ic->journal_scatterlist;
|
|
|
+ target_sg = ic->journal_io_scatterlist;
|
|
|
+ } else {
|
|
|
+ source_sg = ic->journal_io_scatterlist;
|
|
|
+ target_sg = ic->journal_scatterlist;
|
|
|
+ }
|
|
|
+
|
|
|
+ do {
|
|
|
+ struct skcipher_request *req;
|
|
|
+ unsigned ivsize;
|
|
|
+ char *iv;
|
|
|
+
|
|
|
+ if (likely(encrypt))
|
|
|
+ rw_section_mac(ic, section, true);
|
|
|
+
|
|
|
+ req = ic->sk_requests[section];
|
|
|
+ ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
|
|
|
+ iv = req->iv;
|
|
|
+
|
|
|
+ memcpy(iv, iv + ivsize, ivsize);
|
|
|
+
|
|
|
+ req->src = source_sg[section];
|
|
|
+ req->dst = target_sg[section];
|
|
|
+
|
|
|
+ if (unlikely(do_crypt(encrypt, req, comp)))
|
|
|
+ atomic_inc(&comp->in_flight);
|
|
|
+
|
|
|
+ section++;
|
|
|
+ n_sections--;
|
|
|
+ } while (n_sections);
|
|
|
+
|
|
|
+ atomic_dec(&comp->in_flight);
|
|
|
+ complete_journal_op(comp);
|
|
|
+}
|
|
|
+
|
|
|
+static void encrypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
|
|
|
+ unsigned n_sections, struct journal_completion *comp)
|
|
|
+{
|
|
|
+ if (ic->journal_xor)
|
|
|
+ return xor_journal(ic, encrypt, section, n_sections, comp);
|
|
|
+ else
|
|
|
+ return crypt_journal(ic, encrypt, section, n_sections, comp);
|
|
|
+}
|
|
|
+
|
|
|
+static void complete_journal_io(unsigned long error, void *context)
|
|
|
+{
|
|
|
+ struct journal_completion *comp = context;
|
|
|
+ if (unlikely(error != 0))
|
|
|
+ dm_integrity_io_error(comp->ic, "writing journal", -EIO);
|
|
|
+ complete_journal_op(comp);
|
|
|
+}
|
|
|
+
|
|
|
+static void rw_journal(struct dm_integrity_c *ic, int op, int op_flags, unsigned section,
|
|
|
+ unsigned n_sections, struct journal_completion *comp)
|
|
|
+{
|
|
|
+ struct dm_io_request io_req;
|
|
|
+ struct dm_io_region io_loc;
|
|
|
+ unsigned sector, n_sectors, pl_index, pl_offset;
|
|
|
+ int r;
|
|
|
+
|
|
|
+ if (unlikely(dm_integrity_failed(ic))) {
|
|
|
+ if (comp)
|
|
|
+ complete_journal_io(-1UL, comp);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ sector = section * ic->journal_section_sectors;
|
|
|
+ n_sectors = n_sections * ic->journal_section_sectors;
|
|
|
+
|
|
|
+ pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
|
|
|
+ pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
|
|
|
+
|
|
|
+ io_req.bi_op = op;
|
|
|
+ io_req.bi_op_flags = op_flags;
|
|
|
+ io_req.mem.type = DM_IO_PAGE_LIST;
|
|
|
+ if (ic->journal_io)
|
|
|
+ io_req.mem.ptr.pl = &ic->journal_io[pl_index];
|
|
|
+ else
|
|
|
+ io_req.mem.ptr.pl = &ic->journal[pl_index];
|
|
|
+ io_req.mem.offset = pl_offset;
|
|
|
+ if (likely(comp != NULL)) {
|
|
|
+ io_req.notify.fn = complete_journal_io;
|
|
|
+ io_req.notify.context = comp;
|
|
|
+ } else {
|
|
|
+ io_req.notify.fn = NULL;
|
|
|
+ }
|
|
|
+ io_req.client = ic->io;
|
|
|
+ io_loc.bdev = ic->dev->bdev;
|
|
|
+ io_loc.sector = ic->start + SB_SECTORS + sector;
|
|
|
+ io_loc.count = n_sectors;
|
|
|
+
|
|
|
+ r = dm_io(&io_req, 1, &io_loc, NULL);
|
|
|
+ if (unlikely(r)) {
|
|
|
+ dm_integrity_io_error(ic, op == REQ_OP_READ ? "reading journal" : "writing journal", r);
|
|
|
+ if (comp) {
|
|
|
+ WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
|
|
|
+ complete_journal_io(-1UL, comp);
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void write_journal(struct dm_integrity_c *ic, unsigned commit_start, unsigned commit_sections)
|
|
|
+{
|
|
|
+ struct journal_completion io_comp;
|
|
|
+ struct journal_completion crypt_comp_1;
|
|
|
+ struct journal_completion crypt_comp_2;
|
|
|
+ unsigned i;
|
|
|
+
|
|
|
+ io_comp.ic = ic;
|
|
|
+ io_comp.comp = COMPLETION_INITIALIZER_ONSTACK(io_comp.comp);
|
|
|
+
|
|
|
+ if (commit_start + commit_sections <= ic->journal_sections) {
|
|
|
+ io_comp.in_flight = (atomic_t)ATOMIC_INIT(1);
|
|
|
+ if (ic->journal_io) {
|
|
|
+ crypt_comp_1.ic = ic;
|
|
|
+ crypt_comp_1.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp_1.comp);
|
|
|
+ crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
|
|
|
+ encrypt_journal(ic, true, commit_start, commit_sections, &crypt_comp_1);
|
|
|
+ wait_for_completion_io(&crypt_comp_1.comp);
|
|
|
+ } else {
|
|
|
+ for (i = 0; i < commit_sections; i++)
|
|
|
+ rw_section_mac(ic, commit_start + i, true);
|
|
|
+ }
|
|
|
+ rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, commit_sections, &io_comp);
|
|
|
+ } else {
|
|
|
+ unsigned to_end;
|
|
|
+ io_comp.in_flight = (atomic_t)ATOMIC_INIT(2);
|
|
|
+ to_end = ic->journal_sections - commit_start;
|
|
|
+ if (ic->journal_io) {
|
|
|
+ crypt_comp_1.ic = ic;
|
|
|
+ crypt_comp_1.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp_1.comp);
|
|
|
+ crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
|
|
|
+ encrypt_journal(ic, true, commit_start, to_end, &crypt_comp_1);
|
|
|
+ if (try_wait_for_completion(&crypt_comp_1.comp)) {
|
|
|
+ rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
|
|
|
+ crypt_comp_1.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp_1.comp);
|
|
|
+ crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
|
|
|
+ encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_1);
|
|
|
+ wait_for_completion_io(&crypt_comp_1.comp);
|
|
|
+ } else {
|
|
|
+ crypt_comp_2.ic = ic;
|
|
|
+ crypt_comp_2.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp_2.comp);
|
|
|
+ crypt_comp_2.in_flight = (atomic_t)ATOMIC_INIT(0);
|
|
|
+ encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_2);
|
|
|
+ wait_for_completion_io(&crypt_comp_1.comp);
|
|
|
+ rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
|
|
|
+ wait_for_completion_io(&crypt_comp_2.comp);
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ for (i = 0; i < to_end; i++)
|
|
|
+ rw_section_mac(ic, commit_start + i, true);
|
|
|
+ rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
|
|
|
+ for (i = 0; i < commit_sections - to_end; i++)
|
|
|
+ rw_section_mac(ic, i, true);
|
|
|
+ }
|
|
|
+ rw_journal(ic, REQ_OP_WRITE, REQ_FUA, 0, commit_sections - to_end, &io_comp);
|
|
|
+ }
|
|
|
+
|
|
|
+ wait_for_completion_io(&io_comp.comp);
|
|
|
+}
|
|
|
+
|
|
|
+static void copy_from_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset,
|
|
|
+ unsigned n_sectors, sector_t target, io_notify_fn fn, void *data)
|
|
|
+{
|
|
|
+ struct dm_io_request io_req;
|
|
|
+ struct dm_io_region io_loc;
|
|
|
+ int r;
|
|
|
+ unsigned sector, pl_index, pl_offset;
|
|
|
+
|
|
|
+ if (unlikely(dm_integrity_failed(ic))) {
|
|
|
+ fn(-1UL, data);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ sector = section * ic->journal_section_sectors + JOURNAL_BLOCK_SECTORS + offset;
|
|
|
+
|
|
|
+ pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
|
|
|
+ pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
|
|
|
+
|
|
|
+ io_req.bi_op = REQ_OP_WRITE;
|
|
|
+ io_req.bi_op_flags = 0;
|
|
|
+ io_req.mem.type = DM_IO_PAGE_LIST;
|
|
|
+ io_req.mem.ptr.pl = &ic->journal[pl_index];
|
|
|
+ io_req.mem.offset = pl_offset;
|
|
|
+ io_req.notify.fn = fn;
|
|
|
+ io_req.notify.context = data;
|
|
|
+ io_req.client = ic->io;
|
|
|
+ io_loc.bdev = ic->dev->bdev;
|
|
|
+ io_loc.sector = ic->start + target;
|
|
|
+ io_loc.count = n_sectors;
|
|
|
+
|
|
|
+ r = dm_io(&io_req, 1, &io_loc, NULL);
|
|
|
+ if (unlikely(r)) {
|
|
|
+ WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
|
|
|
+ fn(-1UL, data);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static bool add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
|
|
|
+{
|
|
|
+ struct rb_node **n = &ic->in_progress.rb_node;
|
|
|
+ struct rb_node *parent;
|
|
|
+
|
|
|
+ parent = NULL;
|
|
|
+
|
|
|
+ while (*n) {
|
|
|
+ struct dm_integrity_range *range = container_of(*n, struct dm_integrity_range, node);
|
|
|
+
|
|
|
+ parent = *n;
|
|
|
+ if (new_range->logical_sector + new_range->n_sectors <= range->logical_sector) {
|
|
|
+ n = &range->node.rb_left;
|
|
|
+ } else if (new_range->logical_sector >= range->logical_sector + range->n_sectors) {
|
|
|
+ n = &range->node.rb_right;
|
|
|
+ } else {
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ rb_link_node(&new_range->node, parent, n);
|
|
|
+ rb_insert_color(&new_range->node, &ic->in_progress);
|
|
|
+
|
|
|
+ return true;
|
|
|
+}
|
|
|
+
|
|
|
+static void remove_range_unlocked(struct dm_integrity_c *ic, struct dm_integrity_range *range)
|
|
|
+{
|
|
|
+ rb_erase(&range->node, &ic->in_progress);
|
|
|
+ wake_up_locked(&ic->endio_wait);
|
|
|
+}
|
|
|
+
|
|
|
+static void remove_range(struct dm_integrity_c *ic, struct dm_integrity_range *range)
|
|
|
+{
|
|
|
+ unsigned long flags;
|
|
|
+
|
|
|
+ spin_lock_irqsave(&ic->endio_wait.lock, flags);
|
|
|
+ remove_range_unlocked(ic, range);
|
|
|
+ spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
|
|
|
+}
|
|
|
+
|
|
|
+static void init_journal_node(struct journal_node *node)
|
|
|
+{
|
|
|
+ RB_CLEAR_NODE(&node->node);
|
|
|
+ node->sector = (sector_t)-1;
|
|
|
+}
|
|
|
+
|
|
|
+static void add_journal_node(struct dm_integrity_c *ic, struct journal_node *node, sector_t sector)
|
|
|
+{
|
|
|
+ struct rb_node **link;
|
|
|
+ struct rb_node *parent;
|
|
|
+
|
|
|
+ node->sector = sector;
|
|
|
+ BUG_ON(!RB_EMPTY_NODE(&node->node));
|
|
|
+
|
|
|
+ link = &ic->journal_tree_root.rb_node;
|
|
|
+ parent = NULL;
|
|
|
+
|
|
|
+ while (*link) {
|
|
|
+ struct journal_node *j;
|
|
|
+ parent = *link;
|
|
|
+ j = container_of(parent, struct journal_node, node);
|
|
|
+ if (sector < j->sector)
|
|
|
+ link = &j->node.rb_left;
|
|
|
+ else
|
|
|
+ link = &j->node.rb_right;
|
|
|
+ }
|
|
|
+
|
|
|
+ rb_link_node(&node->node, parent, link);
|
|
|
+ rb_insert_color(&node->node, &ic->journal_tree_root);
|
|
|
+}
|
|
|
+
|
|
|
+static void remove_journal_node(struct dm_integrity_c *ic, struct journal_node *node)
|
|
|
+{
|
|
|
+ BUG_ON(RB_EMPTY_NODE(&node->node));
|
|
|
+ rb_erase(&node->node, &ic->journal_tree_root);
|
|
|
+ init_journal_node(node);
|
|
|
+}
|
|
|
+
|
|
|
+#define NOT_FOUND (-1U)
|
|
|
+
|
|
|
+static unsigned find_journal_node(struct dm_integrity_c *ic, sector_t sector, sector_t *next_sector)
|
|
|
+{
|
|
|
+ struct rb_node *n = ic->journal_tree_root.rb_node;
|
|
|
+ unsigned found = NOT_FOUND;
|
|
|
+ *next_sector = (sector_t)-1;
|
|
|
+ while (n) {
|
|
|
+ struct journal_node *j = container_of(n, struct journal_node, node);
|
|
|
+ if (sector == j->sector) {
|
|
|
+ found = j - ic->journal_tree;
|
|
|
+ }
|
|
|
+ if (sector < j->sector) {
|
|
|
+ *next_sector = j->sector;
|
|
|
+ n = j->node.rb_left;
|
|
|
+ } else {
|
|
|
+ n = j->node.rb_right;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return found;
|
|
|
+}
|
|
|
+
|
|
|
+static bool test_journal_node(struct dm_integrity_c *ic, unsigned pos, sector_t sector)
|
|
|
+{
|
|
|
+ struct journal_node *node, *next_node;
|
|
|
+ struct rb_node *next;
|
|
|
+
|
|
|
+ if (unlikely(pos >= ic->journal_entries))
|
|
|
+ return false;
|
|
|
+ node = &ic->journal_tree[pos];
|
|
|
+ if (unlikely(RB_EMPTY_NODE(&node->node)))
|
|
|
+ return false;
|
|
|
+ if (unlikely(node->sector != sector))
|
|
|
+ return false;
|
|
|
+
|
|
|
+ next = rb_next(&node->node);
|
|
|
+ if (unlikely(!next))
|
|
|
+ return true;
|
|
|
+
|
|
|
+ next_node = container_of(next, struct journal_node, node);
|
|
|
+ return next_node->sector != sector;
|
|
|
+}
|
|
|
+
|
|
|
+static bool find_newer_committed_node(struct dm_integrity_c *ic, struct journal_node *node)
|
|
|
+{
|
|
|
+ struct rb_node *next;
|
|
|
+ struct journal_node *next_node;
|
|
|
+ unsigned next_section;
|
|
|
+
|
|
|
+ BUG_ON(RB_EMPTY_NODE(&node->node));
|
|
|
+
|
|
|
+ next = rb_next(&node->node);
|
|
|
+ if (unlikely(!next))
|
|
|
+ return false;
|
|
|
+
|
|
|
+ next_node = container_of(next, struct journal_node, node);
|
|
|
+
|
|
|
+ if (next_node->sector != node->sector)
|
|
|
+ return false;
|
|
|
+
|
|
|
+ next_section = (unsigned)(next_node - ic->journal_tree) / ic->journal_section_entries;
|
|
|
+ if (next_section >= ic->committed_section &&
|
|
|
+ next_section < ic->committed_section + ic->n_committed_sections)
|
|
|
+ return true;
|
|
|
+ if (next_section + ic->journal_sections < ic->committed_section + ic->n_committed_sections)
|
|
|
+ return true;
|
|
|
+
|
|
|
+ return false;
|
|
|
+}
|
|
|
+
|
|
|
+#define TAG_READ 0
|
|
|
+#define TAG_WRITE 1
|
|
|
+#define TAG_CMP 2
|
|
|
+
|
|
|
+static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, sector_t *metadata_block,
|
|
|
+ unsigned *metadata_offset, unsigned total_size, int op)
|
|
|
+{
|
|
|
+ do {
|
|
|
+ unsigned char *data, *dp;
|
|
|
+ struct dm_buffer *b;
|
|
|
+ unsigned to_copy;
|
|
|
+ int r;
|
|
|
+
|
|
|
+ r = dm_integrity_failed(ic);
|
|
|
+ if (unlikely(r))
|
|
|
+ return r;
|
|
|
+
|
|
|
+ data = dm_bufio_read(ic->bufio, *metadata_block, &b);
|
|
|
+ if (unlikely(IS_ERR(data)))
|
|
|
+ return PTR_ERR(data);
|
|
|
+
|
|
|
+ to_copy = min((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - *metadata_offset, total_size);
|
|
|
+ dp = data + *metadata_offset;
|
|
|
+ if (op == TAG_READ) {
|
|
|
+ memcpy(tag, dp, to_copy);
|
|
|
+ } else if (op == TAG_WRITE) {
|
|
|
+ memcpy(dp, tag, to_copy);
|
|
|
+ dm_bufio_mark_buffer_dirty(b);
|
|
|
+ } else {
|
|
|
+ /* e.g.: op == TAG_CMP */
|
|
|
+ if (unlikely(memcmp(dp, tag, to_copy))) {
|
|
|
+ unsigned i;
|
|
|
+
|
|
|
+ for (i = 0; i < to_copy; i++) {
|
|
|
+ if (dp[i] != tag[i])
|
|
|
+ break;
|
|
|
+ total_size--;
|
|
|
+ }
|
|
|
+ dm_bufio_release(b);
|
|
|
+ return total_size;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ dm_bufio_release(b);
|
|
|
+
|
|
|
+ tag += to_copy;
|
|
|
+ *metadata_offset += to_copy;
|
|
|
+ if (unlikely(*metadata_offset == 1U << SECTOR_SHIFT << ic->log2_buffer_sectors)) {
|
|
|
+ (*metadata_block)++;
|
|
|
+ *metadata_offset = 0;
|
|
|
+ }
|
|
|
+ total_size -= to_copy;
|
|
|
+ } while (unlikely(total_size));
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void dm_integrity_flush_buffers(struct dm_integrity_c *ic)
|
|
|
+{
|
|
|
+ int r;
|
|
|
+ r = dm_bufio_write_dirty_buffers(ic->bufio);
|
|
|
+ if (unlikely(r))
|
|
|
+ dm_integrity_io_error(ic, "writing tags", r);
|
|
|
+}
|
|
|
+
|
|
|
+static void sleep_on_endio_wait(struct dm_integrity_c *ic)
|
|
|
+{
|
|
|
+ DECLARE_WAITQUEUE(wait, current);
|
|
|
+ __add_wait_queue(&ic->endio_wait, &wait);
|
|
|
+ __set_current_state(TASK_UNINTERRUPTIBLE);
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+ io_schedule();
|
|
|
+ spin_lock_irq(&ic->endio_wait.lock);
|
|
|
+ __remove_wait_queue(&ic->endio_wait, &wait);
|
|
|
+}
|
|
|
+
|
|
|
+static void autocommit_fn(unsigned long data)
|
|
|
+{
|
|
|
+ struct dm_integrity_c *ic = (struct dm_integrity_c *)data;
|
|
|
+
|
|
|
+ if (likely(!dm_integrity_failed(ic)))
|
|
|
+ queue_work(ic->commit_wq, &ic->commit_work);
|
|
|
+}
|
|
|
+
|
|
|
+static void schedule_autocommit(struct dm_integrity_c *ic)
|
|
|
+{
|
|
|
+ if (!timer_pending(&ic->autocommit_timer))
|
|
|
+ mod_timer(&ic->autocommit_timer, jiffies + ic->autocommit_jiffies);
|
|
|
+}
|
|
|
+
|
|
|
+static void submit_flush_bio(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
|
|
|
+{
|
|
|
+ struct bio *bio;
|
|
|
+ spin_lock_irq(&ic->endio_wait.lock);
|
|
|
+ bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
|
|
|
+ bio_list_add(&ic->flush_bio_list, bio);
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+ queue_work(ic->commit_wq, &ic->commit_work);
|
|
|
+}
|
|
|
+
|
|
|
+static void do_endio(struct dm_integrity_c *ic, struct bio *bio)
|
|
|
+{
|
|
|
+ int r = dm_integrity_failed(ic);
|
|
|
+ if (unlikely(r) && !bio->bi_error)
|
|
|
+ bio->bi_error = r;
|
|
|
+ bio_endio(bio);
|
|
|
+}
|
|
|
+
|
|
|
+static void do_endio_flush(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
|
|
|
+{
|
|
|
+ struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
|
|
|
+
|
|
|
+ if (unlikely(dio->fua) && likely(!bio->bi_error) && likely(!dm_integrity_failed(ic)))
|
|
|
+ submit_flush_bio(ic, dio);
|
|
|
+ else
|
|
|
+ do_endio(ic, bio);
|
|
|
+}
|
|
|
+
|
|
|
+static void dec_in_flight(struct dm_integrity_io *dio)
|
|
|
+{
|
|
|
+ if (atomic_dec_and_test(&dio->in_flight)) {
|
|
|
+ struct dm_integrity_c *ic = dio->ic;
|
|
|
+ struct bio *bio;
|
|
|
+
|
|
|
+ remove_range(ic, &dio->range);
|
|
|
+
|
|
|
+ if (unlikely(dio->write))
|
|
|
+ schedule_autocommit(ic);
|
|
|
+
|
|
|
+ bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
|
|
|
+
|
|
|
+ if (unlikely(dio->bi_error) && !bio->bi_error)
|
|
|
+ bio->bi_error = dio->bi_error;
|
|
|
+ if (likely(!bio->bi_error) && unlikely(bio_sectors(bio) != dio->range.n_sectors)) {
|
|
|
+ dio->range.logical_sector += dio->range.n_sectors;
|
|
|
+ bio_advance(bio, dio->range.n_sectors << SECTOR_SHIFT);
|
|
|
+ INIT_WORK(&dio->work, integrity_bio_wait);
|
|
|
+ queue_work(ic->wait_wq, &dio->work);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ do_endio_flush(ic, dio);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void integrity_end_io(struct bio *bio)
|
|
|
+{
|
|
|
+ struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
|
|
|
+
|
|
|
+ bio->bi_iter = dio->orig_bi_iter;
|
|
|
+ bio->bi_bdev = dio->orig_bi_bdev;
|
|
|
+ if (dio->orig_bi_integrity) {
|
|
|
+ bio->bi_integrity = dio->orig_bi_integrity;
|
|
|
+ bio->bi_opf |= REQ_INTEGRITY;
|
|
|
+ }
|
|
|
+ bio->bi_end_io = dio->orig_bi_end_io;
|
|
|
+
|
|
|
+ if (dio->completion)
|
|
|
+ complete(dio->completion);
|
|
|
+
|
|
|
+ dec_in_flight(dio);
|
|
|
+}
|
|
|
+
|
|
|
+static void integrity_sector_checksum(struct dm_integrity_c *ic, sector_t sector,
|
|
|
+ const char *data, char *result)
|
|
|
+{
|
|
|
+ __u64 sector_le = cpu_to_le64(sector);
|
|
|
+ SHASH_DESC_ON_STACK(req, ic->internal_hash);
|
|
|
+ int r;
|
|
|
+ unsigned digest_size;
|
|
|
+
|
|
|
+ req->tfm = ic->internal_hash;
|
|
|
+ req->flags = 0;
|
|
|
+
|
|
|
+ r = crypto_shash_init(req);
|
|
|
+ if (unlikely(r < 0)) {
|
|
|
+ dm_integrity_io_error(ic, "crypto_shash_init", r);
|
|
|
+ goto failed;
|
|
|
+ }
|
|
|
+
|
|
|
+ r = crypto_shash_update(req, (const __u8 *)§or_le, sizeof sector_le);
|
|
|
+ if (unlikely(r < 0)) {
|
|
|
+ dm_integrity_io_error(ic, "crypto_shash_update", r);
|
|
|
+ goto failed;
|
|
|
+ }
|
|
|
+
|
|
|
+ r = crypto_shash_update(req, data, 1 << SECTOR_SHIFT);
|
|
|
+ if (unlikely(r < 0)) {
|
|
|
+ dm_integrity_io_error(ic, "crypto_shash_update", r);
|
|
|
+ goto failed;
|
|
|
+ }
|
|
|
+
|
|
|
+ r = crypto_shash_final(req, result);
|
|
|
+ if (unlikely(r < 0)) {
|
|
|
+ dm_integrity_io_error(ic, "crypto_shash_final", r);
|
|
|
+ goto failed;
|
|
|
+ }
|
|
|
+
|
|
|
+ digest_size = crypto_shash_digestsize(ic->internal_hash);
|
|
|
+ if (unlikely(digest_size < ic->tag_size))
|
|
|
+ memset(result + digest_size, 0, ic->tag_size - digest_size);
|
|
|
+
|
|
|
+ return;
|
|
|
+
|
|
|
+failed:
|
|
|
+ /* this shouldn't happen anyway, the hash functions have no reason to fail */
|
|
|
+ get_random_bytes(result, ic->tag_size);
|
|
|
+}
|
|
|
+
|
|
|
+static void integrity_metadata(struct work_struct *w)
|
|
|
+{
|
|
|
+ struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
|
|
|
+ struct dm_integrity_c *ic = dio->ic;
|
|
|
+
|
|
|
+ int r;
|
|
|
+
|
|
|
+ if (ic->internal_hash) {
|
|
|
+ struct bvec_iter iter;
|
|
|
+ struct bio_vec bv;
|
|
|
+ unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
|
|
|
+ struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
|
|
|
+ char *checksums;
|
|
|
+ unsigned extra_space = digest_size > ic->tag_size ? digest_size - ic->tag_size : 0;
|
|
|
+ char checksums_onstack[ic->tag_size + extra_space];
|
|
|
+ unsigned sectors_to_process = dio->range.n_sectors;
|
|
|
+ sector_t sector = dio->range.logical_sector;
|
|
|
+
|
|
|
+ checksums = kmalloc((PAGE_SIZE >> SECTOR_SHIFT) * ic->tag_size + extra_space,
|
|
|
+ GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN);
|
|
|
+ if (!checksums)
|
|
|
+ checksums = checksums_onstack;
|
|
|
+
|
|
|
+ __bio_for_each_segment(bv, bio, iter, dio->orig_bi_iter) {
|
|
|
+ unsigned pos;
|
|
|
+ char *mem, *checksums_ptr;
|
|
|
+
|
|
|
+again:
|
|
|
+ mem = (char *)kmap_atomic(bv.bv_page) + bv.bv_offset;
|
|
|
+ pos = 0;
|
|
|
+ checksums_ptr = checksums;
|
|
|
+ do {
|
|
|
+ integrity_sector_checksum(ic, sector, mem + pos, checksums_ptr);
|
|
|
+ checksums_ptr += ic->tag_size;
|
|
|
+ sectors_to_process--;
|
|
|
+ pos += 1 << SECTOR_SHIFT;
|
|
|
+ sector++;
|
|
|
+ } while (pos < bv.bv_len && sectors_to_process && checksums != checksums_onstack);
|
|
|
+ kunmap_atomic(mem);
|
|
|
+
|
|
|
+ r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
|
|
|
+ checksums_ptr - checksums, !dio->write ? TAG_CMP : TAG_WRITE);
|
|
|
+ if (unlikely(r)) {
|
|
|
+ if (r > 0) {
|
|
|
+ DMERR("Checksum failed at sector 0x%llx",
|
|
|
+ (unsigned long long)(sector - ((r + ic->tag_size - 1) / ic->tag_size)));
|
|
|
+ r = -EILSEQ;
|
|
|
+ }
|
|
|
+ if (likely(checksums != checksums_onstack))
|
|
|
+ kfree(checksums);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!sectors_to_process)
|
|
|
+ break;
|
|
|
+
|
|
|
+ if (unlikely(pos < bv.bv_len)) {
|
|
|
+ bv.bv_offset += pos;
|
|
|
+ bv.bv_len -= pos;
|
|
|
+ goto again;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (likely(checksums != checksums_onstack))
|
|
|
+ kfree(checksums);
|
|
|
+ } else {
|
|
|
+ struct bio_integrity_payload *bip = dio->orig_bi_integrity;
|
|
|
+
|
|
|
+ if (bip) {
|
|
|
+ struct bio_vec biv;
|
|
|
+ struct bvec_iter iter;
|
|
|
+ unsigned data_to_process = dio->range.n_sectors * ic->tag_size;
|
|
|
+
|
|
|
+ bip_for_each_vec(biv, bip, iter) {
|
|
|
+ unsigned char *tag;
|
|
|
+ unsigned this_len;
|
|
|
+
|
|
|
+ BUG_ON(PageHighMem(biv.bv_page));
|
|
|
+ tag = lowmem_page_address(biv.bv_page) + biv.bv_offset;
|
|
|
+ this_len = min(biv.bv_len, data_to_process);
|
|
|
+ r = dm_integrity_rw_tag(ic, tag, &dio->metadata_block, &dio->metadata_offset,
|
|
|
+ this_len, !dio->write ? TAG_READ : TAG_WRITE);
|
|
|
+ if (unlikely(r))
|
|
|
+ goto error;
|
|
|
+ data_to_process -= this_len;
|
|
|
+ if (!data_to_process)
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ dec_in_flight(dio);
|
|
|
+ return;
|
|
|
+error:
|
|
|
+ dio->bi_error = r;
|
|
|
+ dec_in_flight(dio);
|
|
|
+}
|
|
|
+
|
|
|
+static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
|
|
|
+{
|
|
|
+ struct dm_integrity_c *ic = ti->private;
|
|
|
+ struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
|
|
|
+
|
|
|
+ sector_t area, offset;
|
|
|
+
|
|
|
+ dio->ic = ic;
|
|
|
+ dio->bi_error = 0;
|
|
|
+
|
|
|
+ if (unlikely(bio->bi_opf & REQ_PREFLUSH)) {
|
|
|
+ submit_flush_bio(ic, dio);
|
|
|
+ return DM_MAPIO_SUBMITTED;
|
|
|
+ }
|
|
|
+
|
|
|
+ dio->range.logical_sector = dm_target_offset(ti, bio->bi_iter.bi_sector);
|
|
|
+ dio->write = bio_op(bio) == REQ_OP_WRITE;
|
|
|
+ dio->fua = dio->write && bio->bi_opf & REQ_FUA;
|
|
|
+ if (unlikely(dio->fua)) {
|
|
|
+ /*
|
|
|
+ * Don't pass down the FUA flag because we have to flush
|
|
|
+ * disk cache anyway.
|
|
|
+ */
|
|
|
+ bio->bi_opf &= ~REQ_FUA;
|
|
|
+ }
|
|
|
+ if (unlikely(dio->range.logical_sector + bio_sectors(bio) > ic->provided_data_sectors)) {
|
|
|
+ DMERR("Too big sector number: 0x%llx + 0x%x > 0x%llx",
|
|
|
+ (unsigned long long)dio->range.logical_sector, bio_sectors(bio),
|
|
|
+ (unsigned long long)ic->provided_data_sectors);
|
|
|
+ return -EIO;
|
|
|
+ }
|
|
|
+
|
|
|
+ get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
|
|
|
+ dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
|
|
|
+ bio->bi_iter.bi_sector = get_data_sector(ic, area, offset);
|
|
|
+
|
|
|
+ dm_integrity_map_continue(dio, true);
|
|
|
+ return DM_MAPIO_SUBMITTED;
|
|
|
+}
|
|
|
+
|
|
|
+static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio,
|
|
|
+ unsigned journal_section, unsigned journal_entry)
|
|
|
+{
|
|
|
+ struct dm_integrity_c *ic = dio->ic;
|
|
|
+ sector_t logical_sector;
|
|
|
+ unsigned n_sectors;
|
|
|
+
|
|
|
+ logical_sector = dio->range.logical_sector;
|
|
|
+ n_sectors = dio->range.n_sectors;
|
|
|
+ do {
|
|
|
+ struct bio_vec bv = bio_iovec(bio);
|
|
|
+ char *mem;
|
|
|
+
|
|
|
+ if (unlikely(bv.bv_len >> SECTOR_SHIFT > n_sectors))
|
|
|
+ bv.bv_len = n_sectors << SECTOR_SHIFT;
|
|
|
+ n_sectors -= bv.bv_len >> SECTOR_SHIFT;
|
|
|
+ bio_advance_iter(bio, &bio->bi_iter, bv.bv_len);
|
|
|
+retry_kmap:
|
|
|
+ mem = kmap_atomic(bv.bv_page);
|
|
|
+ if (likely(dio->write))
|
|
|
+ flush_dcache_page(bv.bv_page);
|
|
|
+
|
|
|
+ do {
|
|
|
+ struct journal_entry *je = access_journal_entry(ic, journal_section, journal_entry);
|
|
|
+
|
|
|
+ if (unlikely(!dio->write)) {
|
|
|
+ struct journal_sector *js;
|
|
|
+
|
|
|
+ if (unlikely(journal_entry_is_inprogress(je))) {
|
|
|
+ flush_dcache_page(bv.bv_page);
|
|
|
+ kunmap_atomic(mem);
|
|
|
+
|
|
|
+ __io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
|
|
|
+ goto retry_kmap;
|
|
|
+ }
|
|
|
+ smp_rmb();
|
|
|
+ BUG_ON(journal_entry_get_sector(je) != logical_sector);
|
|
|
+ js = access_journal_data(ic, journal_section, journal_entry);
|
|
|
+ memcpy(mem + bv.bv_offset, js, JOURNAL_SECTOR_DATA);
|
|
|
+ memcpy(mem + bv.bv_offset + JOURNAL_SECTOR_DATA, &je->last_bytes, sizeof je->last_bytes);
|
|
|
+#ifdef INTERNAL_VERIFY
|
|
|
+ if (ic->internal_hash) {
|
|
|
+ char checksums_onstack[max(crypto_shash_digestsize(ic->internal_hash), ic->tag_size)];
|
|
|
+
|
|
|
+ integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, checksums_onstack);
|
|
|
+ if (unlikely(memcmp(checksums_onstack, je->tag, ic->tag_size))) {
|
|
|
+ DMERR("Checksum failed when reading from journal, at sector 0x%llx",
|
|
|
+ (unsigned long long)logical_sector);
|
|
|
+ }
|
|
|
+ }
|
|
|
+#endif
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!ic->internal_hash) {
|
|
|
+ struct bio_integrity_payload *bip = bio_integrity(bio);
|
|
|
+ unsigned tag_todo = ic->tag_size;
|
|
|
+ char *tag_ptr = je->tag;
|
|
|
+
|
|
|
+ if (bip) do {
|
|
|
+ struct bio_vec biv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
|
|
|
+ unsigned tag_now = min(biv.bv_len, tag_todo);
|
|
|
+ char *tag_addr;
|
|
|
+ BUG_ON(PageHighMem(biv.bv_page));
|
|
|
+ tag_addr = lowmem_page_address(biv.bv_page) + biv.bv_offset;
|
|
|
+ if (likely(dio->write))
|
|
|
+ memcpy(tag_ptr, tag_addr, tag_now);
|
|
|
+ else
|
|
|
+ memcpy(tag_addr, tag_ptr, tag_now);
|
|
|
+ bvec_iter_advance(bip->bip_vec, &bip->bip_iter, tag_now);
|
|
|
+ tag_ptr += tag_now;
|
|
|
+ tag_todo -= tag_now;
|
|
|
+ } while (unlikely(tag_todo)); else {
|
|
|
+ if (likely(dio->write))
|
|
|
+ memset(tag_ptr, 0, tag_todo);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (likely(dio->write)) {
|
|
|
+ struct journal_sector *js;
|
|
|
+
|
|
|
+ js = access_journal_data(ic, journal_section, journal_entry);
|
|
|
+ memcpy(js, mem + bv.bv_offset, 1 << SECTOR_SHIFT);
|
|
|
+ je->last_bytes = js->commit_id;
|
|
|
+
|
|
|
+ if (ic->internal_hash) {
|
|
|
+ unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
|
|
|
+ if (unlikely(digest_size > ic->tag_size)) {
|
|
|
+ char checksums_onstack[digest_size];
|
|
|
+ integrity_sector_checksum(ic, logical_sector, (char *)js, checksums_onstack);
|
|
|
+ memcpy(je->tag, checksums_onstack, ic->tag_size);
|
|
|
+ } else
|
|
|
+ integrity_sector_checksum(ic, logical_sector, (char *)js, je->tag);
|
|
|
+ }
|
|
|
+
|
|
|
+ journal_entry_set_sector(je, logical_sector);
|
|
|
+ }
|
|
|
+ logical_sector++;
|
|
|
+
|
|
|
+ journal_entry++;
|
|
|
+ if (unlikely(journal_entry == ic->journal_section_entries)) {
|
|
|
+ journal_entry = 0;
|
|
|
+ journal_section++;
|
|
|
+ wraparound_section(ic, &journal_section);
|
|
|
+ }
|
|
|
+
|
|
|
+ bv.bv_offset += 1 << SECTOR_SHIFT;
|
|
|
+ } while (bv.bv_len -= 1 << SECTOR_SHIFT);
|
|
|
+
|
|
|
+ if (unlikely(!dio->write))
|
|
|
+ flush_dcache_page(bv.bv_page);
|
|
|
+ kunmap_atomic(mem);
|
|
|
+ } while (n_sectors);
|
|
|
+
|
|
|
+ if (likely(dio->write)) {
|
|
|
+ smp_mb();
|
|
|
+ if (unlikely(waitqueue_active(&ic->copy_to_journal_wait)))
|
|
|
+ wake_up(&ic->copy_to_journal_wait);
|
|
|
+ if (ACCESS_ONCE(ic->free_sectors) <= ic->free_sectors_threshold) {
|
|
|
+ queue_work(ic->commit_wq, &ic->commit_work);
|
|
|
+ } else {
|
|
|
+ schedule_autocommit(ic);
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ remove_range(ic, &dio->range);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (unlikely(bio->bi_iter.bi_size)) {
|
|
|
+ sector_t area, offset;
|
|
|
+
|
|
|
+ dio->range.logical_sector = logical_sector;
|
|
|
+ get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
|
|
|
+ dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+
|
|
|
+ return false;
|
|
|
+}
|
|
|
+
|
|
|
+static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map)
|
|
|
+{
|
|
|
+ struct dm_integrity_c *ic = dio->ic;
|
|
|
+ struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
|
|
|
+ unsigned journal_section, journal_entry;
|
|
|
+ unsigned journal_read_pos;
|
|
|
+ struct completion read_comp;
|
|
|
+ bool need_sync_io = ic->internal_hash && !dio->write;
|
|
|
+
|
|
|
+ if (need_sync_io && from_map) {
|
|
|
+ INIT_WORK(&dio->work, integrity_bio_wait);
|
|
|
+ queue_work(ic->metadata_wq, &dio->work);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+lock_retry:
|
|
|
+ spin_lock_irq(&ic->endio_wait.lock);
|
|
|
+retry:
|
|
|
+ if (unlikely(dm_integrity_failed(ic))) {
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+ do_endio(ic, bio);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ dio->range.n_sectors = bio_sectors(bio);
|
|
|
+ journal_read_pos = NOT_FOUND;
|
|
|
+ if (likely(ic->mode == 'J')) {
|
|
|
+ if (dio->write) {
|
|
|
+ unsigned next_entry, i, pos;
|
|
|
+ unsigned ws, we;
|
|
|
+
|
|
|
+ dio->range.n_sectors = min(dio->range.n_sectors, ic->free_sectors);
|
|
|
+ if (unlikely(!dio->range.n_sectors))
|
|
|
+ goto sleep;
|
|
|
+ ic->free_sectors -= dio->range.n_sectors;
|
|
|
+ journal_section = ic->free_section;
|
|
|
+ journal_entry = ic->free_section_entry;
|
|
|
+
|
|
|
+ next_entry = ic->free_section_entry + dio->range.n_sectors;
|
|
|
+ ic->free_section_entry = next_entry % ic->journal_section_entries;
|
|
|
+ ic->free_section += next_entry / ic->journal_section_entries;
|
|
|
+ ic->n_uncommitted_sections += next_entry / ic->journal_section_entries;
|
|
|
+ wraparound_section(ic, &ic->free_section);
|
|
|
+
|
|
|
+ pos = journal_section * ic->journal_section_entries + journal_entry;
|
|
|
+ ws = journal_section;
|
|
|
+ we = journal_entry;
|
|
|
+ for (i = 0; i < dio->range.n_sectors; i++) {
|
|
|
+ struct journal_entry *je;
|
|
|
+
|
|
|
+ add_journal_node(ic, &ic->journal_tree[pos], dio->range.logical_sector + i);
|
|
|
+ pos++;
|
|
|
+ if (unlikely(pos >= ic->journal_entries))
|
|
|
+ pos = 0;
|
|
|
+
|
|
|
+ je = access_journal_entry(ic, ws, we);
|
|
|
+ BUG_ON(!journal_entry_is_unused(je));
|
|
|
+ journal_entry_set_inprogress(je);
|
|
|
+ we++;
|
|
|
+ if (unlikely(we == ic->journal_section_entries)) {
|
|
|
+ we = 0;
|
|
|
+ ws++;
|
|
|
+ wraparound_section(ic, &ws);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+ goto journal_read_write;
|
|
|
+ } else {
|
|
|
+ sector_t next_sector;
|
|
|
+ journal_read_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
|
|
|
+ if (likely(journal_read_pos == NOT_FOUND)) {
|
|
|
+ if (unlikely(dio->range.n_sectors > next_sector - dio->range.logical_sector))
|
|
|
+ dio->range.n_sectors = next_sector - dio->range.logical_sector;
|
|
|
+ } else {
|
|
|
+ unsigned i;
|
|
|
+ for (i = 1; i < dio->range.n_sectors; i++) {
|
|
|
+ if (!test_journal_node(ic, journal_read_pos + i, dio->range.logical_sector + i))
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ dio->range.n_sectors = i;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if (unlikely(!add_new_range(ic, &dio->range))) {
|
|
|
+ /*
|
|
|
+ * We must not sleep in the request routine because it could
|
|
|
+ * stall bios on current->bio_list.
|
|
|
+ * So, we offload the bio to a workqueue if we have to sleep.
|
|
|
+ */
|
|
|
+sleep:
|
|
|
+ if (from_map) {
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+ INIT_WORK(&dio->work, integrity_bio_wait);
|
|
|
+ queue_work(ic->wait_wq, &dio->work);
|
|
|
+ return;
|
|
|
+ } else {
|
|
|
+ sleep_on_endio_wait(ic);
|
|
|
+ goto retry;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+
|
|
|
+ if (unlikely(journal_read_pos != NOT_FOUND)) {
|
|
|
+ journal_section = journal_read_pos / ic->journal_section_entries;
|
|
|
+ journal_entry = journal_read_pos % ic->journal_section_entries;
|
|
|
+ goto journal_read_write;
|
|
|
+ }
|
|
|
+
|
|
|
+ dio->in_flight = (atomic_t)ATOMIC_INIT(2);
|
|
|
+
|
|
|
+ if (need_sync_io) {
|
|
|
+ read_comp = COMPLETION_INITIALIZER_ONSTACK(read_comp);
|
|
|
+ dio->completion = &read_comp;
|
|
|
+ } else
|
|
|
+ dio->completion = NULL;
|
|
|
+
|
|
|
+ dio->orig_bi_iter = bio->bi_iter;
|
|
|
+
|
|
|
+ dio->orig_bi_bdev = bio->bi_bdev;
|
|
|
+ bio->bi_bdev = ic->dev->bdev;
|
|
|
+
|
|
|
+ dio->orig_bi_integrity = bio_integrity(bio);
|
|
|
+ bio->bi_integrity = NULL;
|
|
|
+ bio->bi_opf &= ~REQ_INTEGRITY;
|
|
|
+
|
|
|
+ dio->orig_bi_end_io = bio->bi_end_io;
|
|
|
+ bio->bi_end_io = integrity_end_io;
|
|
|
+
|
|
|
+ bio->bi_iter.bi_size = dio->range.n_sectors << SECTOR_SHIFT;
|
|
|
+ bio->bi_iter.bi_sector += ic->start;
|
|
|
+ generic_make_request(bio);
|
|
|
+
|
|
|
+ if (need_sync_io) {
|
|
|
+ wait_for_completion_io(&read_comp);
|
|
|
+ integrity_metadata(&dio->work);
|
|
|
+ } else {
|
|
|
+ INIT_WORK(&dio->work, integrity_metadata);
|
|
|
+ queue_work(ic->metadata_wq, &dio->work);
|
|
|
+ }
|
|
|
+
|
|
|
+ return;
|
|
|
+
|
|
|
+journal_read_write:
|
|
|
+ if (unlikely(__journal_read_write(dio, bio, journal_section, journal_entry)))
|
|
|
+ goto lock_retry;
|
|
|
+
|
|
|
+ do_endio_flush(ic, dio);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static void integrity_bio_wait(struct work_struct *w)
|
|
|
+{
|
|
|
+ struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
|
|
|
+
|
|
|
+ dm_integrity_map_continue(dio, false);
|
|
|
+}
|
|
|
+
|
|
|
+static void pad_uncommitted(struct dm_integrity_c *ic)
|
|
|
+{
|
|
|
+ if (ic->free_section_entry) {
|
|
|
+ ic->free_sectors -= ic->journal_section_entries - ic->free_section_entry;
|
|
|
+ ic->free_section_entry = 0;
|
|
|
+ ic->free_section++;
|
|
|
+ wraparound_section(ic, &ic->free_section);
|
|
|
+ ic->n_uncommitted_sections++;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void integrity_commit(struct work_struct *w)
|
|
|
+{
|
|
|
+ struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, commit_work);
|
|
|
+ unsigned commit_start, commit_sections;
|
|
|
+ unsigned i, j, n;
|
|
|
+ struct bio *flushes;
|
|
|
+
|
|
|
+ del_timer(&ic->autocommit_timer);
|
|
|
+
|
|
|
+ spin_lock_irq(&ic->endio_wait.lock);
|
|
|
+ flushes = bio_list_get(&ic->flush_bio_list);
|
|
|
+ if (unlikely(ic->mode != 'J')) {
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+ dm_integrity_flush_buffers(ic);
|
|
|
+ goto release_flush_bios;
|
|
|
+ }
|
|
|
+
|
|
|
+ pad_uncommitted(ic);
|
|
|
+ commit_start = ic->uncommitted_section;
|
|
|
+ commit_sections = ic->n_uncommitted_sections;
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+
|
|
|
+ if (!commit_sections)
|
|
|
+ goto release_flush_bios;
|
|
|
+
|
|
|
+ i = commit_start;
|
|
|
+ for (n = 0; n < commit_sections; n++) {
|
|
|
+ for (j = 0; j < ic->journal_section_entries; j++) {
|
|
|
+ struct journal_entry *je;
|
|
|
+ je = access_journal_entry(ic, i, j);
|
|
|
+ io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
|
|
|
+ }
|
|
|
+ for (j = 0; j < ic->journal_section_sectors; j++) {
|
|
|
+ struct journal_sector *js;
|
|
|
+ js = access_journal(ic, i, j);
|
|
|
+ js->commit_id = dm_integrity_commit_id(ic, i, j, ic->commit_seq);
|
|
|
+ }
|
|
|
+ i++;
|
|
|
+ if (unlikely(i >= ic->journal_sections))
|
|
|
+ ic->commit_seq = next_commit_seq(ic->commit_seq);
|
|
|
+ wraparound_section(ic, &i);
|
|
|
+ }
|
|
|
+ smp_rmb();
|
|
|
+
|
|
|
+ write_journal(ic, commit_start, commit_sections);
|
|
|
+
|
|
|
+ spin_lock_irq(&ic->endio_wait.lock);
|
|
|
+ ic->uncommitted_section += commit_sections;
|
|
|
+ wraparound_section(ic, &ic->uncommitted_section);
|
|
|
+ ic->n_uncommitted_sections -= commit_sections;
|
|
|
+ ic->n_committed_sections += commit_sections;
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+
|
|
|
+ if (ACCESS_ONCE(ic->free_sectors) <= ic->free_sectors_threshold)
|
|
|
+ queue_work(ic->writer_wq, &ic->writer_work);
|
|
|
+
|
|
|
+release_flush_bios:
|
|
|
+ while (flushes) {
|
|
|
+ struct bio *next = flushes->bi_next;
|
|
|
+ flushes->bi_next = NULL;
|
|
|
+ do_endio(ic, flushes);
|
|
|
+ flushes = next;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void complete_copy_from_journal(unsigned long error, void *context)
|
|
|
+{
|
|
|
+ struct journal_io *io = context;
|
|
|
+ struct journal_completion *comp = io->comp;
|
|
|
+ struct dm_integrity_c *ic = comp->ic;
|
|
|
+ remove_range(ic, &io->range);
|
|
|
+ mempool_free(io, ic->journal_io_mempool);
|
|
|
+ if (unlikely(error != 0))
|
|
|
+ dm_integrity_io_error(ic, "copying from journal", -EIO);
|
|
|
+ complete_journal_op(comp);
|
|
|
+}
|
|
|
+
|
|
|
+static void do_journal_write(struct dm_integrity_c *ic, unsigned write_start,
|
|
|
+ unsigned write_sections, bool from_replay)
|
|
|
+{
|
|
|
+ unsigned i, j, n;
|
|
|
+ struct journal_completion comp;
|
|
|
+
|
|
|
+ comp.ic = ic;
|
|
|
+ comp.in_flight = (atomic_t)ATOMIC_INIT(1);
|
|
|
+ comp.comp = COMPLETION_INITIALIZER_ONSTACK(comp.comp);
|
|
|
+
|
|
|
+ i = write_start;
|
|
|
+ for (n = 0; n < write_sections; n++, i++, wraparound_section(ic, &i)) {
|
|
|
+#ifndef INTERNAL_VERIFY
|
|
|
+ if (unlikely(from_replay))
|
|
|
+#endif
|
|
|
+ rw_section_mac(ic, i, false);
|
|
|
+ for (j = 0; j < ic->journal_section_entries; j++) {
|
|
|
+ struct journal_entry *je = access_journal_entry(ic, i, j);
|
|
|
+ sector_t sec, area, offset;
|
|
|
+ unsigned k, l, next_loop;
|
|
|
+ sector_t metadata_block;
|
|
|
+ unsigned metadata_offset;
|
|
|
+ struct journal_io *io;
|
|
|
+
|
|
|
+ if (journal_entry_is_unused(je))
|
|
|
+ continue;
|
|
|
+ BUG_ON(unlikely(journal_entry_is_inprogress(je)) && !from_replay);
|
|
|
+ sec = journal_entry_get_sector(je);
|
|
|
+ get_area_and_offset(ic, sec, &area, &offset);
|
|
|
+ access_journal_data(ic, i, j)->commit_id = je->last_bytes;
|
|
|
+ for (k = j + 1; k < ic->journal_section_entries; k++) {
|
|
|
+ struct journal_entry *je2 = access_journal_entry(ic, i, k);
|
|
|
+ sector_t sec2, area2, offset2;
|
|
|
+ if (journal_entry_is_unused(je2))
|
|
|
+ break;
|
|
|
+ BUG_ON(unlikely(journal_entry_is_inprogress(je2)) && !from_replay);
|
|
|
+ sec2 = journal_entry_get_sector(je2);
|
|
|
+ get_area_and_offset(ic, sec2, &area2, &offset2);
|
|
|
+ if (area2 != area || offset2 != offset + (k - j))
|
|
|
+ break;
|
|
|
+ access_journal_data(ic, i, k)->commit_id = je2->last_bytes;
|
|
|
+ }
|
|
|
+ next_loop = k - 1;
|
|
|
+
|
|
|
+ io = mempool_alloc(ic->journal_io_mempool, GFP_NOIO);
|
|
|
+ io->comp = ∁
|
|
|
+ io->range.logical_sector = sec;
|
|
|
+ io->range.n_sectors = k - j;
|
|
|
+
|
|
|
+ spin_lock_irq(&ic->endio_wait.lock);
|
|
|
+ while (unlikely(!add_new_range(ic, &io->range)))
|
|
|
+ sleep_on_endio_wait(ic);
|
|
|
+
|
|
|
+ if (likely(!from_replay)) {
|
|
|
+ struct journal_node *section_node = &ic->journal_tree[i * ic->journal_section_entries];
|
|
|
+
|
|
|
+ /* don't write if there is newer committed sector */
|
|
|
+ while (j < k && find_newer_committed_node(ic, §ion_node[j])) {
|
|
|
+ struct journal_entry *je2 = access_journal_entry(ic, i, j);
|
|
|
+
|
|
|
+ journal_entry_set_unused(je2);
|
|
|
+ remove_journal_node(ic, §ion_node[j]);
|
|
|
+ j++;
|
|
|
+ sec++;
|
|
|
+ offset++;
|
|
|
+ }
|
|
|
+ while (j < k && find_newer_committed_node(ic, §ion_node[k - 1])) {
|
|
|
+ struct journal_entry *je2 = access_journal_entry(ic, i, k - 1);
|
|
|
+
|
|
|
+ journal_entry_set_unused(je2);
|
|
|
+ remove_journal_node(ic, §ion_node[k - 1]);
|
|
|
+ k--;
|
|
|
+ }
|
|
|
+ if (j == k) {
|
|
|
+ remove_range_unlocked(ic, &io->range);
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+ mempool_free(io, ic->journal_io_mempool);
|
|
|
+ goto skip_io;
|
|
|
+ }
|
|
|
+ for (l = j; l < k; l++) {
|
|
|
+ remove_journal_node(ic, §ion_node[l]);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+
|
|
|
+ metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
|
|
|
+ for (l = j; l < k; l++) {
|
|
|
+ int r;
|
|
|
+ struct journal_entry *je2 = access_journal_entry(ic, i, l);
|
|
|
+
|
|
|
+ if (
|
|
|
+#ifndef INTERNAL_VERIFY
|
|
|
+ unlikely(from_replay) &&
|
|
|
+#endif
|
|
|
+ ic->internal_hash) {
|
|
|
+ unsigned char test_tag[ic->tag_size];
|
|
|
+
|
|
|
+ integrity_sector_checksum(ic, sec + (l - j),
|
|
|
+ (char *)access_journal_data(ic, i, l), test_tag);
|
|
|
+ if (unlikely(memcmp(test_tag, je2->tag, ic->tag_size)))
|
|
|
+ dm_integrity_io_error(ic, "tag mismatch when replaying journal", -EILSEQ);
|
|
|
+ }
|
|
|
+
|
|
|
+ journal_entry_set_unused(je2);
|
|
|
+ r = dm_integrity_rw_tag(ic, je2->tag, &metadata_block, &metadata_offset,
|
|
|
+ ic->tag_size, TAG_WRITE);
|
|
|
+ if (unlikely(r)) {
|
|
|
+ dm_integrity_io_error(ic, "reading tags", r);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ atomic_inc(&comp.in_flight);
|
|
|
+ copy_from_journal(ic, i, j, k - j, get_data_sector(ic, area, offset),
|
|
|
+ complete_copy_from_journal, io);
|
|
|
+skip_io:
|
|
|
+ j = next_loop;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ dm_bufio_write_dirty_buffers_async(ic->bufio);
|
|
|
+
|
|
|
+ complete_journal_op(&comp);
|
|
|
+ wait_for_completion_io(&comp.comp);
|
|
|
+
|
|
|
+ dm_integrity_flush_buffers(ic);
|
|
|
+}
|
|
|
+
|
|
|
+static void integrity_writer(struct work_struct *w)
|
|
|
+{
|
|
|
+ struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, writer_work);
|
|
|
+ unsigned write_start, write_sections;
|
|
|
+
|
|
|
+ unsigned prev_free_sectors;
|
|
|
+
|
|
|
+ /* the following test is not needed, but it tests the replay code */
|
|
|
+ if (ACCESS_ONCE(ic->suspending))
|
|
|
+ return;
|
|
|
+
|
|
|
+ spin_lock_irq(&ic->endio_wait.lock);
|
|
|
+ write_start = ic->committed_section;
|
|
|
+ write_sections = ic->n_committed_sections;
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+
|
|
|
+ if (!write_sections)
|
|
|
+ return;
|
|
|
+
|
|
|
+ do_journal_write(ic, write_start, write_sections, false);
|
|
|
+
|
|
|
+ spin_lock_irq(&ic->endio_wait.lock);
|
|
|
+
|
|
|
+ ic->committed_section += write_sections;
|
|
|
+ wraparound_section(ic, &ic->committed_section);
|
|
|
+ ic->n_committed_sections -= write_sections;
|
|
|
+
|
|
|
+ prev_free_sectors = ic->free_sectors;
|
|
|
+ ic->free_sectors += write_sections * ic->journal_section_entries;
|
|
|
+ if (unlikely(!prev_free_sectors))
|
|
|
+ wake_up_locked(&ic->endio_wait);
|
|
|
+
|
|
|
+ spin_unlock_irq(&ic->endio_wait.lock);
|
|
|
+}
|
|
|
+
|
|
|
+static void init_journal(struct dm_integrity_c *ic, unsigned start_section,
|
|
|
+ unsigned n_sections, unsigned char commit_seq)
|
|
|
+{
|
|
|
+ unsigned i, j, n;
|
|
|
+
|
|
|
+ if (!n_sections)
|
|
|
+ return;
|
|
|
+
|
|
|
+ for (n = 0; n < n_sections; n++) {
|
|
|
+ i = start_section + n;
|
|
|
+ wraparound_section(ic, &i);
|
|
|
+ for (j = 0; j < ic->journal_section_sectors; j++) {
|
|
|
+ struct journal_sector *js = access_journal(ic, i, j);
|
|
|
+ memset(&js->entries, 0, JOURNAL_SECTOR_DATA);
|
|
|
+ js->commit_id = dm_integrity_commit_id(ic, i, j, commit_seq);
|
|
|
+ }
|
|
|
+ for (j = 0; j < ic->journal_section_entries; j++) {
|
|
|
+ struct journal_entry *je = access_journal_entry(ic, i, j);
|
|
|
+ journal_entry_set_unused(je);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ write_journal(ic, start_section, n_sections);
|
|
|
+}
|
|
|
+
|
|
|
+static int find_commit_seq(struct dm_integrity_c *ic, unsigned i, unsigned j, commit_id_t id)
|
|
|
+{
|
|
|
+ unsigned char k;
|
|
|
+ for (k = 0; k < N_COMMIT_IDS; k++) {
|
|
|
+ if (dm_integrity_commit_id(ic, i, j, k) == id)
|
|
|
+ return k;
|
|
|
+ }
|
|
|
+ dm_integrity_io_error(ic, "journal commit id", -EIO);
|
|
|
+ return -EIO;
|
|
|
+}
|
|
|
+
|
|
|
+static void replay_journal(struct dm_integrity_c *ic)
|
|
|
+{
|
|
|
+ unsigned i, j;
|
|
|
+ bool used_commit_ids[N_COMMIT_IDS];
|
|
|
+ unsigned max_commit_id_sections[N_COMMIT_IDS];
|
|
|
+ unsigned write_start, write_sections;
|
|
|
+ unsigned continue_section;
|
|
|
+ bool journal_empty;
|
|
|
+ unsigned char unused, last_used, want_commit_seq;
|
|
|
+
|
|
|
+ if (ic->journal_uptodate)
|
|
|
+ return;
|
|
|
+
|
|
|
+ last_used = 0;
|
|
|
+ write_start = 0;
|
|
|
+
|
|
|
+ if (!ic->just_formatted) {
|
|
|
+ DEBUG_print("reading journal\n");
|
|
|
+ rw_journal(ic, REQ_OP_READ, 0, 0, ic->journal_sections, NULL);
|
|
|
+ if (ic->journal_io)
|
|
|
+ DEBUG_bytes(lowmem_page_address(ic->journal_io[0].page), 64, "read journal");
|
|
|
+ if (ic->journal_io) {
|
|
|
+ struct journal_completion crypt_comp;
|
|
|
+ crypt_comp.ic = ic;
|
|
|
+ crypt_comp.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp.comp);
|
|
|
+ crypt_comp.in_flight = (atomic_t)ATOMIC_INIT(0);
|
|
|
+ encrypt_journal(ic, false, 0, ic->journal_sections, &crypt_comp);
|
|
|
+ wait_for_completion(&crypt_comp.comp);
|
|
|
+ }
|
|
|
+ DEBUG_bytes(lowmem_page_address(ic->journal[0].page), 64, "decrypted journal");
|
|
|
+ }
|
|
|
+
|
|
|
+ if (dm_integrity_failed(ic))
|
|
|
+ goto clear_journal;
|
|
|
+
|
|
|
+ journal_empty = true;
|
|
|
+ memset(used_commit_ids, 0, sizeof used_commit_ids);
|
|
|
+ memset(max_commit_id_sections, 0, sizeof max_commit_id_sections);
|
|
|
+ for (i = 0; i < ic->journal_sections; i++) {
|
|
|
+ for (j = 0; j < ic->journal_section_sectors; j++) {
|
|
|
+ int k;
|
|
|
+ struct journal_sector *js = access_journal(ic, i, j);
|
|
|
+ k = find_commit_seq(ic, i, j, js->commit_id);
|
|
|
+ if (k < 0)
|
|
|
+ goto clear_journal;
|
|
|
+ used_commit_ids[k] = true;
|
|
|
+ max_commit_id_sections[k] = i;
|
|
|
+ }
|
|
|
+ if (journal_empty) {
|
|
|
+ for (j = 0; j < ic->journal_section_entries; j++) {
|
|
|
+ struct journal_entry *je = access_journal_entry(ic, i, j);
|
|
|
+ if (!journal_entry_is_unused(je)) {
|
|
|
+ journal_empty = false;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!used_commit_ids[N_COMMIT_IDS - 1]) {
|
|
|
+ unused = N_COMMIT_IDS - 1;
|
|
|
+ while (unused && !used_commit_ids[unused - 1])
|
|
|
+ unused--;
|
|
|
+ } else {
|
|
|
+ for (unused = 0; unused < N_COMMIT_IDS; unused++)
|
|
|
+ if (!used_commit_ids[unused])
|
|
|
+ break;
|
|
|
+ if (unused == N_COMMIT_IDS) {
|
|
|
+ dm_integrity_io_error(ic, "journal commit ids", -EIO);
|
|
|
+ goto clear_journal;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ DEBUG_print("first unused commit seq %d [%d,%d,%d,%d]\n",
|
|
|
+ unused, used_commit_ids[0], used_commit_ids[1],
|
|
|
+ used_commit_ids[2], used_commit_ids[3]);
|
|
|
+
|
|
|
+ last_used = prev_commit_seq(unused);
|
|
|
+ want_commit_seq = prev_commit_seq(last_used);
|
|
|
+
|
|
|
+ if (!used_commit_ids[want_commit_seq] && used_commit_ids[prev_commit_seq(want_commit_seq)])
|
|
|
+ journal_empty = true;
|
|
|
+
|
|
|
+ write_start = max_commit_id_sections[last_used] + 1;
|
|
|
+ if (unlikely(write_start >= ic->journal_sections))
|
|
|
+ want_commit_seq = next_commit_seq(want_commit_seq);
|
|
|
+ wraparound_section(ic, &write_start);
|
|
|
+
|
|
|
+ i = write_start;
|
|
|
+ for (write_sections = 0; write_sections < ic->journal_sections; write_sections++) {
|
|
|
+ for (j = 0; j < ic->journal_section_sectors; j++) {
|
|
|
+ struct journal_sector *js = access_journal(ic, i, j);
|
|
|
+
|
|
|
+ if (js->commit_id != dm_integrity_commit_id(ic, i, j, want_commit_seq)) {
|
|
|
+ /*
|
|
|
+ * This could be caused by crash during writing.
|
|
|
+ * We won't replay the inconsistent part of the
|
|
|
+ * journal.
|
|
|
+ */
|
|
|
+ DEBUG_print("commit id mismatch at position (%u, %u): %d != %d\n",
|
|
|
+ i, j, find_commit_seq(ic, i, j, js->commit_id), want_commit_seq);
|
|
|
+ goto brk;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ i++;
|
|
|
+ if (unlikely(i >= ic->journal_sections))
|
|
|
+ want_commit_seq = next_commit_seq(want_commit_seq);
|
|
|
+ wraparound_section(ic, &i);
|
|
|
+ }
|
|
|
+brk:
|
|
|
+
|
|
|
+ if (!journal_empty) {
|
|
|
+ DEBUG_print("replaying %u sections, starting at %u, commit seq %d\n",
|
|
|
+ write_sections, write_start, want_commit_seq);
|
|
|
+ do_journal_write(ic, write_start, write_sections, true);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (write_sections == ic->journal_sections && (ic->mode == 'J' || journal_empty)) {
|
|
|
+ continue_section = write_start;
|
|
|
+ ic->commit_seq = want_commit_seq;
|
|
|
+ DEBUG_print("continuing from section %u, commit seq %d\n", write_start, ic->commit_seq);
|
|
|
+ } else {
|
|
|
+ unsigned s;
|
|
|
+ unsigned char erase_seq;
|
|
|
+clear_journal:
|
|
|
+ DEBUG_print("clearing journal\n");
|
|
|
+
|
|
|
+ erase_seq = prev_commit_seq(prev_commit_seq(last_used));
|
|
|
+ s = write_start;
|
|
|
+ init_journal(ic, s, 1, erase_seq);
|
|
|
+ s++;
|
|
|
+ wraparound_section(ic, &s);
|
|
|
+ if (ic->journal_sections >= 2) {
|
|
|
+ init_journal(ic, s, ic->journal_sections - 2, erase_seq);
|
|
|
+ s += ic->journal_sections - 2;
|
|
|
+ wraparound_section(ic, &s);
|
|
|
+ init_journal(ic, s, 1, erase_seq);
|
|
|
+ }
|
|
|
+
|
|
|
+ continue_section = 0;
|
|
|
+ ic->commit_seq = next_commit_seq(erase_seq);
|
|
|
+ }
|
|
|
+
|
|
|
+ ic->committed_section = continue_section;
|
|
|
+ ic->n_committed_sections = 0;
|
|
|
+
|
|
|
+ ic->uncommitted_section = continue_section;
|
|
|
+ ic->n_uncommitted_sections = 0;
|
|
|
+
|
|
|
+ ic->free_section = continue_section;
|
|
|
+ ic->free_section_entry = 0;
|
|
|
+ ic->free_sectors = ic->journal_entries;
|
|
|
+
|
|
|
+ ic->journal_tree_root = RB_ROOT;
|
|
|
+ for (i = 0; i < ic->journal_entries; i++)
|
|
|
+ init_journal_node(&ic->journal_tree[i]);
|
|
|
+}
|
|
|
+
|
|
|
+static void dm_integrity_postsuspend(struct dm_target *ti)
|
|
|
+{
|
|
|
+ struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
|
|
|
+
|
|
|
+ del_timer_sync(&ic->autocommit_timer);
|
|
|
+
|
|
|
+ ic->suspending = true;
|
|
|
+
|
|
|
+ queue_work(ic->commit_wq, &ic->commit_work);
|
|
|
+ drain_workqueue(ic->commit_wq);
|
|
|
+
|
|
|
+ if (ic->mode == 'J') {
|
|
|
+ drain_workqueue(ic->writer_wq);
|
|
|
+ dm_integrity_flush_buffers(ic);
|
|
|
+ }
|
|
|
+
|
|
|
+ ic->suspending = false;
|
|
|
+
|
|
|
+ BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
|
|
|
+
|
|
|
+ ic->journal_uptodate = true;
|
|
|
+}
|
|
|
+
|
|
|
+static void dm_integrity_resume(struct dm_target *ti)
|
|
|
+{
|
|
|
+ struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
|
|
|
+
|
|
|
+ replay_journal(ic);
|
|
|
+}
|
|
|
+
|
|
|
+static void dm_integrity_status(struct dm_target *ti, status_type_t type,
|
|
|
+ unsigned status_flags, char *result, unsigned maxlen)
|
|
|
+{
|
|
|
+ struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
|
|
|
+ unsigned arg_count;
|
|
|
+ size_t sz = 0;
|
|
|
+
|
|
|
+ switch (type) {
|
|
|
+ case STATUSTYPE_INFO:
|
|
|
+ result[0] = '\0';
|
|
|
+ break;
|
|
|
+
|
|
|
+ case STATUSTYPE_TABLE: {
|
|
|
+ __u64 watermark_percentage = (__u64)(ic->journal_entries - ic->free_sectors_threshold) * 100;
|
|
|
+ watermark_percentage += ic->journal_entries / 2;
|
|
|
+ do_div(watermark_percentage, ic->journal_entries);
|
|
|
+ arg_count = 5;
|
|
|
+ arg_count += !!ic->internal_hash_alg.alg_string;
|
|
|
+ arg_count += !!ic->journal_crypt_alg.alg_string;
|
|
|
+ arg_count += !!ic->journal_mac_alg.alg_string;
|
|
|
+ DMEMIT("%s %llu %u %c %u", ic->dev->name, (unsigned long long)ic->start,
|
|
|
+ ic->tag_size, ic->mode, arg_count);
|
|
|
+ DMEMIT(" journal-sectors:%u", ic->initial_sectors - SB_SECTORS);
|
|
|
+ DMEMIT(" interleave-sectors:%u", 1U << ic->sb->log2_interleave_sectors);
|
|
|
+ DMEMIT(" buffer-sectors:%u", 1U << ic->log2_buffer_sectors);
|
|
|
+ DMEMIT(" journal-watermark:%u", (unsigned)watermark_percentage);
|
|
|
+ DMEMIT(" commit-time:%u", ic->autocommit_msec);
|
|
|
+
|
|
|
+#define EMIT_ALG(a, n) \
|
|
|
+ do { \
|
|
|
+ if (ic->a.alg_string) { \
|
|
|
+ DMEMIT(" %s:%s", n, ic->a.alg_string); \
|
|
|
+ if (ic->a.key_string) \
|
|
|
+ DMEMIT(":%s", ic->a.key_string);\
|
|
|
+ } \
|
|
|
+ } while (0)
|
|
|
+ EMIT_ALG(internal_hash_alg, "internal-hash");
|
|
|
+ EMIT_ALG(journal_crypt_alg, "journal-crypt");
|
|
|
+ EMIT_ALG(journal_mac_alg, "journal-mac");
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static int dm_integrity_iterate_devices(struct dm_target *ti,
|
|
|
+ iterate_devices_callout_fn fn, void *data)
|
|
|
+{
|
|
|
+ struct dm_integrity_c *ic = ti->private;
|
|
|
+
|
|
|
+ return fn(ti, ic->dev, ic->start + ic->initial_sectors + ic->metadata_run, ti->len, data);
|
|
|
+}
|
|
|
+
|
|
|
+static void calculate_journal_section_size(struct dm_integrity_c *ic)
|
|
|
+{
|
|
|
+ unsigned sector_space = JOURNAL_SECTOR_DATA;
|
|
|
+
|
|
|
+ ic->journal_sections = le32_to_cpu(ic->sb->journal_sections);
|
|
|
+ ic->journal_entry_size = roundup(offsetof(struct journal_entry, tag) + ic->tag_size,
|
|
|
+ JOURNAL_ENTRY_ROUNDUP);
|
|
|
+
|
|
|
+ if (ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC))
|
|
|
+ sector_space -= JOURNAL_MAC_PER_SECTOR;
|
|
|
+ ic->journal_entries_per_sector = sector_space / ic->journal_entry_size;
|
|
|
+ ic->journal_section_entries = ic->journal_entries_per_sector * JOURNAL_BLOCK_SECTORS;
|
|
|
+ ic->journal_section_sectors = ic->journal_section_entries + JOURNAL_BLOCK_SECTORS;
|
|
|
+ ic->journal_entries = ic->journal_section_entries * ic->journal_sections;
|
|
|
+}
|
|
|
+
|
|
|
+static int calculate_device_limits(struct dm_integrity_c *ic)
|
|
|
+{
|
|
|
+ __u64 initial_sectors;
|
|
|
+ sector_t last_sector, last_area, last_offset;
|
|
|
+
|
|
|
+ calculate_journal_section_size(ic);
|
|
|
+ initial_sectors = SB_SECTORS + (__u64)ic->journal_section_sectors * ic->journal_sections;
|
|
|
+ if (initial_sectors + METADATA_PADDING_SECTORS >= ic->device_sectors || initial_sectors > UINT_MAX)
|
|
|
+ return -EINVAL;
|
|
|
+ ic->initial_sectors = initial_sectors;
|
|
|
+
|
|
|
+ ic->metadata_run = roundup((__u64)ic->tag_size << ic->sb->log2_interleave_sectors,
|
|
|
+ (__u64)(1 << SECTOR_SHIFT << METADATA_PADDING_SECTORS)) >> SECTOR_SHIFT;
|
|
|
+ if (!(ic->metadata_run & (ic->metadata_run - 1)))
|
|
|
+ ic->log2_metadata_run = __ffs(ic->metadata_run);
|
|
|
+ else
|
|
|
+ ic->log2_metadata_run = -1;
|
|
|
+
|
|
|
+ get_area_and_offset(ic, ic->provided_data_sectors - 1, &last_area, &last_offset);
|
|
|
+ last_sector = get_data_sector(ic, last_area, last_offset);
|
|
|
+
|
|
|
+ if (ic->start + last_sector < last_sector || ic->start + last_sector >= ic->device_sectors)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int initialize_superblock(struct dm_integrity_c *ic, unsigned journal_sectors, unsigned interleave_sectors)
|
|
|
+{
|
|
|
+ unsigned journal_sections;
|
|
|
+ int test_bit;
|
|
|
+
|
|
|
+ memcpy(ic->sb->magic, SB_MAGIC, 8);
|
|
|
+ ic->sb->version = SB_VERSION;
|
|
|
+ ic->sb->integrity_tag_size = cpu_to_le16(ic->tag_size);
|
|
|
+ if (ic->journal_mac_alg.alg_string)
|
|
|
+ ic->sb->flags |= cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC);
|
|
|
+
|
|
|
+ calculate_journal_section_size(ic);
|
|
|
+ journal_sections = journal_sectors / ic->journal_section_sectors;
|
|
|
+ if (!journal_sections)
|
|
|
+ journal_sections = 1;
|
|
|
+ ic->sb->journal_sections = cpu_to_le32(journal_sections);
|
|
|
+
|
|
|
+ ic->sb->log2_interleave_sectors = __fls(interleave_sectors);
|
|
|
+ ic->sb->log2_interleave_sectors = max((__u8)MIN_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
|
|
|
+ ic->sb->log2_interleave_sectors = min((__u8)MAX_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
|
|
|
+
|
|
|
+ ic->provided_data_sectors = 0;
|
|
|
+ for (test_bit = fls64(ic->device_sectors) - 1; test_bit >= 3; test_bit--) {
|
|
|
+ __u64 prev_data_sectors = ic->provided_data_sectors;
|
|
|
+
|
|
|
+ ic->provided_data_sectors |= (sector_t)1 << test_bit;
|
|
|
+ if (calculate_device_limits(ic))
|
|
|
+ ic->provided_data_sectors = prev_data_sectors;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!le64_to_cpu(ic->provided_data_sectors))
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void dm_integrity_set(struct dm_target *ti, struct dm_integrity_c *ic)
|
|
|
+{
|
|
|
+ struct gendisk *disk = dm_disk(dm_table_get_md(ti->table));
|
|
|
+ struct blk_integrity bi;
|
|
|
+
|
|
|
+ memset(&bi, 0, sizeof(bi));
|
|
|
+ bi.profile = &dm_integrity_profile;
|
|
|
+ bi.tuple_size = ic->tag_size * (queue_logical_block_size(disk->queue) >> SECTOR_SHIFT);
|
|
|
+ bi.tag_size = ic->tag_size;
|
|
|
+
|
|
|
+ blk_integrity_register(disk, &bi);
|
|
|
+ blk_queue_max_integrity_segments(disk->queue, UINT_MAX);
|
|
|
+}
|
|
|
+
|
|
|
+/* FIXME: use new kvmalloc */
|
|
|
+static void *dm_integrity_kvmalloc(size_t size, gfp_t gfp)
|
|
|
+{
|
|
|
+ void *ptr = NULL;
|
|
|
+
|
|
|
+ if (size <= PAGE_SIZE)
|
|
|
+ ptr = kmalloc(size, GFP_KERNEL | gfp);
|
|
|
+ if (!ptr && size <= KMALLOC_MAX_SIZE)
|
|
|
+ ptr = kmalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY | gfp);
|
|
|
+ if (!ptr)
|
|
|
+ ptr = __vmalloc(size, GFP_KERNEL | gfp, PAGE_KERNEL);
|
|
|
+
|
|
|
+ return ptr;
|
|
|
+}
|
|
|
+
|
|
|
+static void dm_integrity_free_page_list(struct dm_integrity_c *ic, struct page_list *pl)
|
|
|
+{
|
|
|
+ unsigned i;
|
|
|
+
|
|
|
+ if (!pl)
|
|
|
+ return;
|
|
|
+ for (i = 0; i < ic->journal_pages; i++)
|
|
|
+ if (pl[i].page)
|
|
|
+ __free_page(pl[i].page);
|
|
|
+ kvfree(pl);
|
|
|
+}
|
|
|
+
|
|
|
+static struct page_list *dm_integrity_alloc_page_list(struct dm_integrity_c *ic)
|
|
|
+{
|
|
|
+ size_t page_list_desc_size = ic->journal_pages * sizeof(struct page_list);
|
|
|
+ struct page_list *pl;
|
|
|
+ unsigned i;
|
|
|
+
|
|
|
+ pl = dm_integrity_kvmalloc(page_list_desc_size, __GFP_ZERO);
|
|
|
+ if (!pl)
|
|
|
+ return NULL;
|
|
|
+
|
|
|
+ for (i = 0; i < ic->journal_pages; i++) {
|
|
|
+ pl[i].page = alloc_page(GFP_KERNEL);
|
|
|
+ if (!pl[i].page) {
|
|
|
+ dm_integrity_free_page_list(ic, pl);
|
|
|
+ return NULL;
|
|
|
+ }
|
|
|
+ if (i)
|
|
|
+ pl[i - 1].next = &pl[i];
|
|
|
+ }
|
|
|
+
|
|
|
+ return pl;
|
|
|
+}
|
|
|
+
|
|
|
+static void dm_integrity_free_journal_scatterlist(struct dm_integrity_c *ic, struct scatterlist **sl)
|
|
|
+{
|
|
|
+ unsigned i;
|
|
|
+ for (i = 0; i < ic->journal_sections; i++)
|
|
|
+ kvfree(sl[i]);
|
|
|
+ kfree(sl);
|
|
|
+}
|
|
|
+
|
|
|
+static struct scatterlist **dm_integrity_alloc_journal_scatterlist(struct dm_integrity_c *ic, struct page_list *pl)
|
|
|
+{
|
|
|
+ struct scatterlist **sl;
|
|
|
+ unsigned i;
|
|
|
+
|
|
|
+ sl = dm_integrity_kvmalloc(ic->journal_sections * sizeof(struct scatterlist *), __GFP_ZERO);
|
|
|
+ if (!sl)
|
|
|
+ return NULL;
|
|
|
+
|
|
|
+ for (i = 0; i < ic->journal_sections; i++) {
|
|
|
+ struct scatterlist *s;
|
|
|
+ unsigned start_index, start_offset;
|
|
|
+ unsigned end_index, end_offset;
|
|
|
+ unsigned n_pages;
|
|
|
+ unsigned idx;
|
|
|
+
|
|
|
+ page_list_location(ic, i, 0, &start_index, &start_offset);
|
|
|
+ page_list_location(ic, i, ic->journal_section_sectors - 1, &end_index, &end_offset);
|
|
|
+
|
|
|
+ n_pages = (end_index - start_index + 1);
|
|
|
+
|
|
|
+ s = dm_integrity_kvmalloc(n_pages * sizeof(struct scatterlist), 0);
|
|
|
+ if (!s) {
|
|
|
+ dm_integrity_free_journal_scatterlist(ic, sl);
|
|
|
+ return NULL;
|
|
|
+ }
|
|
|
+
|
|
|
+ sg_init_table(s, n_pages);
|
|
|
+ for (idx = start_index; idx <= end_index; idx++) {
|
|
|
+ char *va = lowmem_page_address(pl[idx].page);
|
|
|
+ unsigned start = 0, end = PAGE_SIZE;
|
|
|
+ if (idx == start_index)
|
|
|
+ start = start_offset;
|
|
|
+ if (idx == end_index)
|
|
|
+ end = end_offset + (1 << SECTOR_SHIFT);
|
|
|
+ sg_set_buf(&s[idx - start_index], va + start, end - start);
|
|
|
+ }
|
|
|
+
|
|
|
+ sl[i] = s;
|
|
|
+ }
|
|
|
+
|
|
|
+ return sl;
|
|
|
+}
|
|
|
+
|
|
|
+static void free_alg(struct alg_spec *a)
|
|
|
+{
|
|
|
+ kzfree(a->alg_string);
|
|
|
+ kzfree(a->key);
|
|
|
+ memset(a, 0, sizeof *a);
|
|
|
+}
|
|
|
+
|
|
|
+static int get_alg_and_key(const char *arg, struct alg_spec *a, char **error, char *error_inval)
|
|
|
+{
|
|
|
+ char *k;
|
|
|
+
|
|
|
+ free_alg(a);
|
|
|
+
|
|
|
+ a->alg_string = kstrdup(strchr(arg, ':') + 1, GFP_KERNEL);
|
|
|
+ if (!a->alg_string)
|
|
|
+ goto nomem;
|
|
|
+
|
|
|
+ k = strchr(a->alg_string, ':');
|
|
|
+ if (k) {
|
|
|
+ unsigned i;
|
|
|
+
|
|
|
+ *k = 0;
|
|
|
+ a->key_string = k + 1;
|
|
|
+ if (strlen(a->key_string) & 1)
|
|
|
+ goto inval;
|
|
|
+
|
|
|
+ a->key_size = strlen(a->key_string) / 2;
|
|
|
+ a->key = kmalloc(a->key_size, GFP_KERNEL);
|
|
|
+ if (!a->key)
|
|
|
+ goto nomem;
|
|
|
+ for (i = 0; i < a->key_size; i++) {
|
|
|
+ char digit[3];
|
|
|
+ digit[0] = a->key_string[i * 2];
|
|
|
+ digit[1] = a->key_string[i * 2 + 1];
|
|
|
+ digit[2] = 0;
|
|
|
+ if (strspn(digit, "0123456789abcdefABCDEF") != 2)
|
|
|
+ goto inval;
|
|
|
+ if (kstrtou8(digit, 16, &a->key[i]))
|
|
|
+ goto inval;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+inval:
|
|
|
+ *error = error_inval;
|
|
|
+ return -EINVAL;
|
|
|
+nomem:
|
|
|
+ *error = "Out of memory for an argument";
|
|
|
+ return -ENOMEM;
|
|
|
+}
|
|
|
+
|
|
|
+static int get_mac(struct crypto_shash **hash, struct alg_spec *a, char **error,
|
|
|
+ char *error_alg, char *error_key)
|
|
|
+{
|
|
|
+ int r;
|
|
|
+
|
|
|
+ if (a->alg_string) {
|
|
|
+ *hash = crypto_alloc_shash(a->alg_string, 0, CRYPTO_ALG_ASYNC);
|
|
|
+ if (IS_ERR(*hash)) {
|
|
|
+ *error = error_alg;
|
|
|
+ r = PTR_ERR(*hash);
|
|
|
+ *hash = NULL;
|
|
|
+ return r;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (a->key) {
|
|
|
+ r = crypto_shash_setkey(*hash, a->key, a->key_size);
|
|
|
+ if (r) {
|
|
|
+ *error = error_key;
|
|
|
+ return r;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Construct a integrity mapping: <dev_path> <offset> <tag_size>
|
|
|
+ *
|
|
|
+ * Arguments:
|
|
|
+ * device
|
|
|
+ * offset from the start of the device
|
|
|
+ * tag size
|
|
|
+ * D - direct writes, J - journal writes
|
|
|
+ * number of optional arguments
|
|
|
+ * optional arguments:
|
|
|
+ * journal-sectors
|
|
|
+ * interleave-sectors
|
|
|
+ * buffer-sectors
|
|
|
+ * journal-watermark
|
|
|
+ * commit-time
|
|
|
+ * internal-hash
|
|
|
+ * journal-crypt
|
|
|
+ * journal-mac
|
|
|
+ */
|
|
|
+static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
|
|
|
+{
|
|
|
+ struct dm_integrity_c *ic;
|
|
|
+ char dummy;
|
|
|
+ int r;
|
|
|
+ unsigned i;
|
|
|
+ unsigned extra_args;
|
|
|
+ struct dm_arg_set as;
|
|
|
+ static struct dm_arg _args[] = {
|
|
|
+ {0, 7, "Invalid number of feature args"},
|
|
|
+ };
|
|
|
+ unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
|
|
|
+ bool should_write_sb;
|
|
|
+ __u64 journal_pages, journal_desc_size, journal_tree_size;
|
|
|
+ __u64 threshold;
|
|
|
+ unsigned long long start;
|
|
|
+
|
|
|
+#define DIRECT_ARGUMENTS 4
|
|
|
+
|
|
|
+ if (argc <= DIRECT_ARGUMENTS) {
|
|
|
+ ti->error = "Invalid argument count";
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ ic = kzalloc(sizeof(struct dm_integrity_c), GFP_KERNEL);
|
|
|
+ if (!ic) {
|
|
|
+ ti->error = "Cannot allocate integrity context";
|
|
|
+ return -ENOMEM;
|
|
|
+ }
|
|
|
+ ti->private = ic;
|
|
|
+ ti->per_io_data_size = sizeof(struct dm_integrity_io);
|
|
|
+
|
|
|
+ ic->commit_ids[0] = cpu_to_le64(0x1111111111111111ULL);
|
|
|
+ ic->commit_ids[1] = cpu_to_le64(0x2222222222222222ULL);
|
|
|
+ ic->commit_ids[2] = cpu_to_le64(0x3333333333333333ULL);
|
|
|
+ ic->commit_ids[3] = cpu_to_le64(0x4444444444444444ULL);
|
|
|
+
|
|
|
+ ic->in_progress = RB_ROOT;
|
|
|
+ init_waitqueue_head(&ic->endio_wait);
|
|
|
+ bio_list_init(&ic->flush_bio_list);
|
|
|
+ init_waitqueue_head(&ic->copy_to_journal_wait);
|
|
|
+ init_completion(&ic->crypto_backoff);
|
|
|
+
|
|
|
+ r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev);
|
|
|
+ if (r) {
|
|
|
+ ti->error = "Device lookup failed";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1 || start != (sector_t)start) {
|
|
|
+ ti->error = "Invalid starting offset";
|
|
|
+ r = -EINVAL;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ ic->start = start;
|
|
|
+
|
|
|
+ if (strcmp(argv[2], "-")) {
|
|
|
+ if (sscanf(argv[2], "%u%c", &ic->tag_size, &dummy) != 1 || !ic->tag_size) {
|
|
|
+ ti->error = "Invalid tag size";
|
|
|
+ r = -EINVAL;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!strcmp(argv[3], "J") || !strcmp(argv[3], "D"))
|
|
|
+ ic->mode = argv[3][0];
|
|
|
+ else {
|
|
|
+ ti->error = "Invalid mode (expecting J or D)";
|
|
|
+ r = -EINVAL;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+
|
|
|
+ ic->device_sectors = i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT;
|
|
|
+ journal_sectors = min((sector_t)DEFAULT_MAX_JOURNAL_SECTORS,
|
|
|
+ ic->device_sectors >> DEFAULT_JOURNAL_SIZE_FACTOR);
|
|
|
+ interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
|
|
|
+ buffer_sectors = DEFAULT_BUFFER_SECTORS;
|
|
|
+ journal_watermark = DEFAULT_JOURNAL_WATERMARK;
|
|
|
+ sync_msec = DEFAULT_SYNC_MSEC;
|
|
|
+
|
|
|
+ as.argc = argc - DIRECT_ARGUMENTS;
|
|
|
+ as.argv = argv + DIRECT_ARGUMENTS;
|
|
|
+ r = dm_read_arg_group(_args, &as, &extra_args, &ti->error);
|
|
|
+ if (r)
|
|
|
+ goto bad;
|
|
|
+
|
|
|
+ while (extra_args--) {
|
|
|
+ const char *opt_string;
|
|
|
+ unsigned val;
|
|
|
+ opt_string = dm_shift_arg(&as);
|
|
|
+ if (!opt_string) {
|
|
|
+ r = -EINVAL;
|
|
|
+ ti->error = "Not enough feature arguments";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ if (sscanf(opt_string, "journal-sectors:%u%c", &val, &dummy) == 1)
|
|
|
+ journal_sectors = val;
|
|
|
+ else if (sscanf(opt_string, "interleave-sectors:%u%c", &val, &dummy) == 1)
|
|
|
+ interleave_sectors = val;
|
|
|
+ else if (sscanf(opt_string, "buffer-sectors:%u%c", &val, &dummy) == 1)
|
|
|
+ buffer_sectors = val;
|
|
|
+ else if (sscanf(opt_string, "journal-watermark:%u%c", &val, &dummy) == 1 && val <= 100)
|
|
|
+ journal_watermark = val;
|
|
|
+ else if (sscanf(opt_string, "commit-time:%u%c", &val, &dummy) == 1)
|
|
|
+ sync_msec = val;
|
|
|
+ else if (!memcmp(opt_string, "internal-hash:", strlen("internal-hash:"))) {
|
|
|
+ r = get_alg_and_key(opt_string, &ic->internal_hash_alg, &ti->error,
|
|
|
+ "Invalid internal-hash argument");
|
|
|
+ if (r)
|
|
|
+ goto bad;
|
|
|
+ } else if (!memcmp(opt_string, "journal-crypt:", strlen("journal-crypt:"))) {
|
|
|
+ r = get_alg_and_key(opt_string, &ic->journal_crypt_alg, &ti->error,
|
|
|
+ "Invalid journal-crypt argument");
|
|
|
+ if (r)
|
|
|
+ goto bad;
|
|
|
+ } else if (!memcmp(opt_string, "journal-mac:", strlen("journal-mac:"))) {
|
|
|
+ r = get_alg_and_key(opt_string, &ic->journal_mac_alg, &ti->error,
|
|
|
+ "Invalid journal-mac argument");
|
|
|
+ if (r)
|
|
|
+ goto bad;
|
|
|
+ } else {
|
|
|
+ r = -EINVAL;
|
|
|
+ ti->error = "Invalid argument";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ r = get_mac(&ic->internal_hash, &ic->internal_hash_alg, &ti->error,
|
|
|
+ "Invalid internal hash", "Error setting internal hash key");
|
|
|
+ if (r)
|
|
|
+ goto bad;
|
|
|
+
|
|
|
+ r = get_mac(&ic->journal_mac, &ic->journal_mac_alg, &ti->error,
|
|
|
+ "Invalid journal mac", "Error setting journal mac key");
|
|
|
+ if (r)
|
|
|
+ goto bad;
|
|
|
+
|
|
|
+ if (!ic->tag_size) {
|
|
|
+ if (!ic->internal_hash) {
|
|
|
+ ti->error = "Unknown tag size";
|
|
|
+ r = -EINVAL;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ ic->tag_size = crypto_shash_digestsize(ic->internal_hash);
|
|
|
+ }
|
|
|
+ if (ic->tag_size > MAX_TAG_SIZE) {
|
|
|
+ ti->error = "Too big tag size";
|
|
|
+ r = -EINVAL;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ if (!(ic->tag_size & (ic->tag_size - 1)))
|
|
|
+ ic->log2_tag_size = __ffs(ic->tag_size);
|
|
|
+ else
|
|
|
+ ic->log2_tag_size = -1;
|
|
|
+
|
|
|
+ ic->autocommit_jiffies = msecs_to_jiffies(sync_msec);
|
|
|
+ ic->autocommit_msec = sync_msec;
|
|
|
+ setup_timer(&ic->autocommit_timer, autocommit_fn, (unsigned long)ic);
|
|
|
+
|
|
|
+ ic->io = dm_io_client_create();
|
|
|
+ if (IS_ERR(ic->io)) {
|
|
|
+ r = PTR_ERR(ic->io);
|
|
|
+ ic->io = NULL;
|
|
|
+ ti->error = "Cannot allocate dm io";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+
|
|
|
+ ic->journal_io_mempool = mempool_create_slab_pool(JOURNAL_IO_MEMPOOL, journal_io_cache);
|
|
|
+ if (!ic->journal_io_mempool) {
|
|
|
+ r = -ENOMEM;
|
|
|
+ ti->error = "Cannot allocate mempool";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+
|
|
|
+ ic->metadata_wq = alloc_workqueue("dm-integrity-metadata",
|
|
|
+ WQ_MEM_RECLAIM, METADATA_WORKQUEUE_MAX_ACTIVE);
|
|
|
+ if (!ic->metadata_wq) {
|
|
|
+ ti->error = "Cannot allocate workqueue";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * If this workqueue were percpu, it would cause bio reordering
|
|
|
+ * and reduced performance.
|
|
|
+ */
|
|
|
+ ic->wait_wq = alloc_workqueue("dm-integrity-wait", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
|
|
|
+ if (!ic->wait_wq) {
|
|
|
+ ti->error = "Cannot allocate workqueue";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+
|
|
|
+ ic->commit_wq = alloc_workqueue("dm-integrity-commit", WQ_MEM_RECLAIM, 1);
|
|
|
+ if (!ic->commit_wq) {
|
|
|
+ ti->error = "Cannot allocate workqueue";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ INIT_WORK(&ic->commit_work, integrity_commit);
|
|
|
+
|
|
|
+ if (ic->mode == 'J') {
|
|
|
+ ic->writer_wq = alloc_workqueue("dm-integrity-writer", WQ_MEM_RECLAIM, 1);
|
|
|
+ if (!ic->writer_wq) {
|
|
|
+ ti->error = "Cannot allocate workqueue";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ INIT_WORK(&ic->writer_work, integrity_writer);
|
|
|
+ }
|
|
|
+
|
|
|
+ ic->sb = alloc_pages_exact(SB_SECTORS << SECTOR_SHIFT, GFP_KERNEL);
|
|
|
+ if (!ic->sb) {
|
|
|
+ r = -ENOMEM;
|
|
|
+ ti->error = "Cannot allocate superblock area";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+
|
|
|
+ r = sync_rw_sb(ic, REQ_OP_READ, 0);
|
|
|
+ if (r) {
|
|
|
+ ti->error = "Error reading superblock";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ if (!memcmp(ic->sb->magic, SB_MAGIC, 8)) {
|
|
|
+ should_write_sb = false;
|
|
|
+ } else {
|
|
|
+ for (i = 0; i < 512; i += 8) {
|
|
|
+ if (*(__u64 *)((__u8 *)ic->sb + i)) {
|
|
|
+ r = -EINVAL;
|
|
|
+ ti->error = "The device is not initialized";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ r = initialize_superblock(ic, journal_sectors, interleave_sectors);
|
|
|
+ if (r) {
|
|
|
+ ti->error = "Could not initialize superblock";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ should_write_sb = true;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (ic->sb->version != SB_VERSION) {
|
|
|
+ r = -EINVAL;
|
|
|
+ ti->error = "Unknown version";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ if (le16_to_cpu(ic->sb->integrity_tag_size) != ic->tag_size) {
|
|
|
+ r = -EINVAL;
|
|
|
+ ti->error = "Invalid tag size";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ /* make sure that ti->max_io_len doesn't overflow */
|
|
|
+ if (ic->sb->log2_interleave_sectors < MIN_INTERLEAVE_SECTORS ||
|
|
|
+ ic->sb->log2_interleave_sectors > MAX_INTERLEAVE_SECTORS) {
|
|
|
+ r = -EINVAL;
|
|
|
+ ti->error = "Invalid interleave_sectors in the superblock";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ ic->provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors);
|
|
|
+ if (ic->provided_data_sectors != le64_to_cpu(ic->sb->provided_data_sectors)) {
|
|
|
+ /* test for overflow */
|
|
|
+ r = -EINVAL;
|
|
|
+ ti->error = "The superblock has 64-bit device size, but the kernel was compiled with 32-bit sectors";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) {
|
|
|
+ r = -EINVAL;
|
|
|
+ ti->error = "Journal mac mismatch";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ r = calculate_device_limits(ic);
|
|
|
+ if (r) {
|
|
|
+ ti->error = "The device is too small";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!buffer_sectors)
|
|
|
+ buffer_sectors = 1;
|
|
|
+ ic->log2_buffer_sectors = min3((int)__fls(buffer_sectors), (int)__ffs(ic->metadata_run), 31 - SECTOR_SHIFT);
|
|
|
+
|
|
|
+ threshold = (__u64)ic->journal_entries * (100 - journal_watermark);
|
|
|
+ threshold += 50;
|
|
|
+ do_div(threshold, 100);
|
|
|
+ ic->free_sectors_threshold = threshold;
|
|
|
+
|
|
|
+ DEBUG_print("initialized:\n");
|
|
|
+ DEBUG_print(" integrity_tag_size %u\n", le16_to_cpu(ic->sb->integrity_tag_size));
|
|
|
+ DEBUG_print(" journal_entry_size %u\n", ic->journal_entry_size);
|
|
|
+ DEBUG_print(" journal_entries_per_sector %u\n", ic->journal_entries_per_sector);
|
|
|
+ DEBUG_print(" journal_section_entries %u\n", ic->journal_section_entries);
|
|
|
+ DEBUG_print(" journal_section_sectors %u\n", ic->journal_section_sectors);
|
|
|
+ DEBUG_print(" journal_sections %u\n", (unsigned)le32_to_cpu(ic->sb->journal_sections));
|
|
|
+ DEBUG_print(" journal_entries %u\n", ic->journal_entries);
|
|
|
+ DEBUG_print(" log2_interleave_sectors %d\n", ic->sb->log2_interleave_sectors);
|
|
|
+ DEBUG_print(" device_sectors 0x%llx\n", (unsigned long long)ic->device_sectors);
|
|
|
+ DEBUG_print(" initial_sectors 0x%x\n", ic->initial_sectors);
|
|
|
+ DEBUG_print(" metadata_run 0x%x\n", ic->metadata_run);
|
|
|
+ DEBUG_print(" log2_metadata_run %d\n", ic->log2_metadata_run);
|
|
|
+ DEBUG_print(" provided_data_sectors 0x%llx (%llu)\n", (unsigned long long)ic->provided_data_sectors,
|
|
|
+ (unsigned long long)ic->provided_data_sectors);
|
|
|
+ DEBUG_print(" log2_buffer_sectors %u\n", ic->log2_buffer_sectors);
|
|
|
+
|
|
|
+ ic->bufio = dm_bufio_client_create(ic->dev->bdev, 1U << (SECTOR_SHIFT + ic->log2_buffer_sectors),
|
|
|
+ 1, 0, NULL, NULL);
|
|
|
+ if (IS_ERR(ic->bufio)) {
|
|
|
+ r = PTR_ERR(ic->bufio);
|
|
|
+ ti->error = "Cannot initialize dm-bufio";
|
|
|
+ ic->bufio = NULL;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ dm_bufio_set_sector_offset(ic->bufio, ic->start + ic->initial_sectors);
|
|
|
+
|
|
|
+ journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors,
|
|
|
+ PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT);
|
|
|
+ journal_desc_size = journal_pages * sizeof(struct page_list);
|
|
|
+ if (journal_pages >= totalram_pages - totalhigh_pages || journal_desc_size > ULONG_MAX) {
|
|
|
+ ti->error = "Journal doesn't fit into memory";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ ic->journal_pages = journal_pages;
|
|
|
+
|
|
|
+ ic->journal = dm_integrity_alloc_page_list(ic);
|
|
|
+ if (!ic->journal) {
|
|
|
+ ti->error = "Could not allocate memory for journal";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ if (ic->journal_crypt_alg.alg_string) {
|
|
|
+ unsigned ivsize, blocksize;
|
|
|
+ struct journal_completion comp;
|
|
|
+ comp.ic = ic;
|
|
|
+
|
|
|
+ ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, 0);
|
|
|
+ if (IS_ERR(ic->journal_crypt)) {
|
|
|
+ ti->error = "Invalid journal cipher";
|
|
|
+ r = PTR_ERR(ic->journal_crypt);
|
|
|
+ ic->journal_crypt = NULL;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
|
|
|
+ blocksize = crypto_skcipher_blocksize(ic->journal_crypt);
|
|
|
+
|
|
|
+ if (ic->journal_crypt_alg.key) {
|
|
|
+ r = crypto_skcipher_setkey(ic->journal_crypt, ic->journal_crypt_alg.key,
|
|
|
+ ic->journal_crypt_alg.key_size);
|
|
|
+ if (r) {
|
|
|
+ ti->error = "Error setting encryption key";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ DEBUG_print("cipher %s, block size %u iv size %u\n",
|
|
|
+ ic->journal_crypt_alg.alg_string, blocksize, ivsize);
|
|
|
+
|
|
|
+ ic->journal_io = dm_integrity_alloc_page_list(ic);
|
|
|
+ if (!ic->journal_io) {
|
|
|
+ ti->error = "Could not allocate memory for journal io";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (blocksize == 1) {
|
|
|
+ struct scatterlist *sg;
|
|
|
+ SKCIPHER_REQUEST_ON_STACK(req, ic->journal_crypt);
|
|
|
+ unsigned char iv[ivsize];
|
|
|
+ skcipher_request_set_tfm(req, ic->journal_crypt);
|
|
|
+
|
|
|
+ ic->journal_xor = dm_integrity_alloc_page_list(ic);
|
|
|
+ if (!ic->journal_xor) {
|
|
|
+ ti->error = "Could not allocate memory for journal xor";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+
|
|
|
+ sg = dm_integrity_kvmalloc((ic->journal_pages + 1) * sizeof(struct scatterlist), 0);
|
|
|
+ if (!sg) {
|
|
|
+ ti->error = "Unable to allocate sg list";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ sg_init_table(sg, ic->journal_pages + 1);
|
|
|
+ for (i = 0; i < ic->journal_pages; i++) {
|
|
|
+ char *va = lowmem_page_address(ic->journal_xor[i].page);
|
|
|
+ clear_page(va);
|
|
|
+ sg_set_buf(&sg[i], va, PAGE_SIZE);
|
|
|
+ }
|
|
|
+ sg_set_buf(&sg[i], &ic->commit_ids, sizeof ic->commit_ids);
|
|
|
+ memset(iv, 0x00, ivsize);
|
|
|
+
|
|
|
+ skcipher_request_set_crypt(req, sg, sg, PAGE_SIZE * ic->journal_pages + sizeof ic->commit_ids, iv);
|
|
|
+ comp.comp = COMPLETION_INITIALIZER_ONSTACK(comp.comp);
|
|
|
+ comp.in_flight = (atomic_t)ATOMIC_INIT(1);
|
|
|
+ if (do_crypt(true, req, &comp))
|
|
|
+ wait_for_completion(&comp.comp);
|
|
|
+ kvfree(sg);
|
|
|
+ if ((r = dm_integrity_failed(ic))) {
|
|
|
+ ti->error = "Unable to encrypt journal";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ DEBUG_bytes(lowmem_page_address(ic->journal_xor[0].page), 64, "xor data");
|
|
|
+
|
|
|
+ crypto_free_skcipher(ic->journal_crypt);
|
|
|
+ ic->journal_crypt = NULL;
|
|
|
+ } else {
|
|
|
+ SKCIPHER_REQUEST_ON_STACK(req, ic->journal_crypt);
|
|
|
+ unsigned char iv[ivsize];
|
|
|
+ unsigned crypt_len = roundup(ivsize, blocksize);
|
|
|
+ unsigned char crypt_data[crypt_len];
|
|
|
+
|
|
|
+ skcipher_request_set_tfm(req, ic->journal_crypt);
|
|
|
+
|
|
|
+ ic->journal_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal);
|
|
|
+ if (!ic->journal_scatterlist) {
|
|
|
+ ti->error = "Unable to allocate sg list";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ ic->journal_io_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal_io);
|
|
|
+ if (!ic->journal_io_scatterlist) {
|
|
|
+ ti->error = "Unable to allocate sg list";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ ic->sk_requests = dm_integrity_kvmalloc(ic->journal_sections * sizeof(struct skcipher_request *), __GFP_ZERO);
|
|
|
+ if (!ic->sk_requests) {
|
|
|
+ ti->error = "Unable to allocate sk requests";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ for (i = 0; i < ic->journal_sections; i++) {
|
|
|
+ struct scatterlist sg;
|
|
|
+ struct skcipher_request *section_req;
|
|
|
+ __u32 section_le = cpu_to_le32(i);
|
|
|
+
|
|
|
+ memset(iv, 0x00, ivsize);
|
|
|
+ memset(crypt_data, 0x00, crypt_len);
|
|
|
+ memcpy(crypt_data, §ion_le, min((size_t)crypt_len, sizeof(section_le)));
|
|
|
+
|
|
|
+ sg_init_one(&sg, crypt_data, crypt_len);
|
|
|
+ skcipher_request_set_crypt(req, &sg, &sg, crypt_len, iv);
|
|
|
+ comp.comp = COMPLETION_INITIALIZER_ONSTACK(comp.comp);
|
|
|
+ comp.in_flight = (atomic_t)ATOMIC_INIT(1);
|
|
|
+ if (do_crypt(true, req, &comp))
|
|
|
+ wait_for_completion(&comp.comp);
|
|
|
+
|
|
|
+ if ((r = dm_integrity_failed(ic))) {
|
|
|
+ ti->error = "Unable to generate iv";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+
|
|
|
+ section_req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
|
|
|
+ if (!section_req) {
|
|
|
+ ti->error = "Unable to allocate crypt request";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ section_req->iv = kmalloc(ivsize * 2, GFP_KERNEL);
|
|
|
+ if (!section_req->iv) {
|
|
|
+ skcipher_request_free(section_req);
|
|
|
+ ti->error = "Unable to allocate iv";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ memcpy(section_req->iv + ivsize, crypt_data, ivsize);
|
|
|
+ section_req->cryptlen = (size_t)ic->journal_section_sectors << SECTOR_SHIFT;
|
|
|
+ ic->sk_requests[i] = section_req;
|
|
|
+ DEBUG_bytes(crypt_data, ivsize, "iv(%u)", i);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ for (i = 0; i < N_COMMIT_IDS; i++) {
|
|
|
+ unsigned j;
|
|
|
+retest_commit_id:
|
|
|
+ for (j = 0; j < i; j++) {
|
|
|
+ if (ic->commit_ids[j] == ic->commit_ids[i]) {
|
|
|
+ ic->commit_ids[i] = cpu_to_le64(le64_to_cpu(ic->commit_ids[i]) + 1);
|
|
|
+ goto retest_commit_id;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ DEBUG_print("commit id %u: %016llx\n", i, ic->commit_ids[i]);
|
|
|
+ }
|
|
|
+
|
|
|
+ journal_tree_size = (__u64)ic->journal_entries * sizeof(struct journal_node);
|
|
|
+ if (journal_tree_size > ULONG_MAX) {
|
|
|
+ ti->error = "Journal doesn't fit into memory";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ ic->journal_tree = dm_integrity_kvmalloc(journal_tree_size, 0);
|
|
|
+ if (!ic->journal_tree) {
|
|
|
+ ti->error = "Could not allocate memory for journal tree";
|
|
|
+ r = -ENOMEM;
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (should_write_sb) {
|
|
|
+ int r;
|
|
|
+
|
|
|
+ init_journal(ic, 0, ic->journal_sections, 0);
|
|
|
+ r = dm_integrity_failed(ic);
|
|
|
+ if (unlikely(r)) {
|
|
|
+ ti->error = "Error initializing journal";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
|
|
|
+ if (r) {
|
|
|
+ ti->error = "Error initializing superblock";
|
|
|
+ goto bad;
|
|
|
+ }
|
|
|
+ ic->just_formatted = true;
|
|
|
+ }
|
|
|
+
|
|
|
+ r = dm_set_target_max_io_len(ti, 1U << ic->sb->log2_interleave_sectors);
|
|
|
+ if (r)
|
|
|
+ goto bad;
|
|
|
+
|
|
|
+ if (!ic->internal_hash)
|
|
|
+ dm_integrity_set(ti, ic);
|
|
|
+
|
|
|
+ ti->num_flush_bios = 1;
|
|
|
+ ti->flush_supported = true;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+bad:
|
|
|
+ dm_integrity_dtr(ti);
|
|
|
+ return r;
|
|
|
+}
|
|
|
+
|
|
|
+static void dm_integrity_dtr(struct dm_target *ti)
|
|
|
+{
|
|
|
+ struct dm_integrity_c *ic = ti->private;
|
|
|
+
|
|
|
+ BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
|
|
|
+
|
|
|
+ if (ic->metadata_wq)
|
|
|
+ destroy_workqueue(ic->metadata_wq);
|
|
|
+ if (ic->wait_wq)
|
|
|
+ destroy_workqueue(ic->wait_wq);
|
|
|
+ if (ic->commit_wq)
|
|
|
+ destroy_workqueue(ic->commit_wq);
|
|
|
+ if (ic->writer_wq)
|
|
|
+ destroy_workqueue(ic->writer_wq);
|
|
|
+ if (ic->bufio)
|
|
|
+ dm_bufio_client_destroy(ic->bufio);
|
|
|
+ mempool_destroy(ic->journal_io_mempool);
|
|
|
+ if (ic->io)
|
|
|
+ dm_io_client_destroy(ic->io);
|
|
|
+ if (ic->dev)
|
|
|
+ dm_put_device(ti, ic->dev);
|
|
|
+ dm_integrity_free_page_list(ic, ic->journal);
|
|
|
+ dm_integrity_free_page_list(ic, ic->journal_io);
|
|
|
+ dm_integrity_free_page_list(ic, ic->journal_xor);
|
|
|
+ if (ic->journal_scatterlist)
|
|
|
+ dm_integrity_free_journal_scatterlist(ic, ic->journal_scatterlist);
|
|
|
+ if (ic->journal_io_scatterlist)
|
|
|
+ dm_integrity_free_journal_scatterlist(ic, ic->journal_io_scatterlist);
|
|
|
+ if (ic->sk_requests) {
|
|
|
+ unsigned i;
|
|
|
+
|
|
|
+ for (i = 0; i < ic->journal_sections; i++) {
|
|
|
+ struct skcipher_request *req = ic->sk_requests[i];
|
|
|
+ if (req) {
|
|
|
+ kzfree(req->iv);
|
|
|
+ skcipher_request_free(req);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ kvfree(ic->sk_requests);
|
|
|
+ }
|
|
|
+ kvfree(ic->journal_tree);
|
|
|
+ if (ic->sb)
|
|
|
+ free_pages_exact(ic->sb, SB_SECTORS << SECTOR_SHIFT);
|
|
|
+
|
|
|
+ if (ic->internal_hash)
|
|
|
+ crypto_free_shash(ic->internal_hash);
|
|
|
+ free_alg(&ic->internal_hash_alg);
|
|
|
+
|
|
|
+ if (ic->journal_crypt)
|
|
|
+ crypto_free_skcipher(ic->journal_crypt);
|
|
|
+ free_alg(&ic->journal_crypt_alg);
|
|
|
+
|
|
|
+ if (ic->journal_mac)
|
|
|
+ crypto_free_shash(ic->journal_mac);
|
|
|
+ free_alg(&ic->journal_mac_alg);
|
|
|
+
|
|
|
+ kfree(ic);
|
|
|
+}
|
|
|
+
|
|
|
+static struct target_type integrity_target = {
|
|
|
+ .name = "integrity",
|
|
|
+ .version = {1, 0, 0},
|
|
|
+ .module = THIS_MODULE,
|
|
|
+ .features = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,
|
|
|
+ .ctr = dm_integrity_ctr,
|
|
|
+ .dtr = dm_integrity_dtr,
|
|
|
+ .map = dm_integrity_map,
|
|
|
+ .postsuspend = dm_integrity_postsuspend,
|
|
|
+ .resume = dm_integrity_resume,
|
|
|
+ .status = dm_integrity_status,
|
|
|
+ .iterate_devices = dm_integrity_iterate_devices,
|
|
|
+};
|
|
|
+
|
|
|
+int __init dm_integrity_init(void)
|
|
|
+{
|
|
|
+ int r;
|
|
|
+
|
|
|
+ journal_io_cache = kmem_cache_create("integrity_journal_io",
|
|
|
+ sizeof(struct journal_io), 0, 0, NULL);
|
|
|
+ if (!journal_io_cache) {
|
|
|
+ DMERR("can't allocate journal io cache");
|
|
|
+ return -ENOMEM;
|
|
|
+ }
|
|
|
+
|
|
|
+ r = dm_register_target(&integrity_target);
|
|
|
+
|
|
|
+ if (r < 0)
|
|
|
+ DMERR("register failed %d", r);
|
|
|
+
|
|
|
+ return r;
|
|
|
+}
|
|
|
+
|
|
|
+void dm_integrity_exit(void)
|
|
|
+{
|
|
|
+ dm_unregister_target(&integrity_target);
|
|
|
+ kmem_cache_destroy(journal_io_cache);
|
|
|
+}
|
|
|
+
|
|
|
+module_init(dm_integrity_init);
|
|
|
+module_exit(dm_integrity_exit);
|
|
|
+
|
|
|
+MODULE_AUTHOR("Milan Broz");
|
|
|
+MODULE_AUTHOR("Mikulas Patocka");
|
|
|
+MODULE_DESCRIPTION(DM_NAME " target for integrity tags extension");
|
|
|
+MODULE_LICENSE("GPL");
|