mirror of https://gitee.com/openkylin/linux.git
3289 lines
92 KiB
C
3289 lines
92 KiB
C
/*
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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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#include <linux/compiler.h>
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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 <linux/dm-bufio.h>
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#define DM_MSG_PREFIX "integrity"
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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_LOG2_INTERLEAVE_SECTORS 3
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#define MAX_LOG2_INTERLEAVE_SECTORS 31
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#define METADATA_WORKQUEUE_MAX_ACTIVE 16
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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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* On disk structures
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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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#define MAX_SECTORS_PER_BLOCK 8
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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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__u8 log2_sectors_per_block;
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};
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#define SB_FLAG_HAVE_JOURNAL_MAC 0x1
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#define JOURNAL_ENTRY_ROUNDUP 8
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typedef __u64 commit_id_t;
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#define JOURNAL_MAC_PER_SECTOR 8
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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[0];
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/* __u8 tag[0]; */
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};
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#define journal_entry_tag(ic, je) ((__u8 *)&(je)->last_bytes[(ic)->sectors_per_block])
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#if BITS_PER_LONG == 64
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#define journal_entry_set_sector(je, x) do { smp_wmb(); WRITE_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(); WRITE_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(); WRITE_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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#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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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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#define MAX_TAG_SIZE (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
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#define METADATA_PADDING_SECTORS 8
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#define N_COMMIT_IDS 4
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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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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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* In-memory structures
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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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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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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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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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struct crypto_shash *journal_mac;
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struct journal_node *journal_tree;
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struct rb_root journal_tree_root;
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sector_t provided_data_sectors;
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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 short 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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__u8 sectors_per_block;
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unsigned char mode;
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bool suspending;
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int failed;
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struct crypto_shash *internal_hash;
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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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unsigned char commit_seq;
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commit_id_t commit_ids[N_COMMIT_IDS];
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unsigned committed_section;
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unsigned n_committed_sections;
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unsigned uncommitted_section;
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unsigned n_uncommitted_sections;
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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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unsigned free_sectors_threshold;
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struct workqueue_struct *commit_wq;
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struct work_struct commit_work;
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struct workqueue_struct *writer_wq;
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struct work_struct writer_work;
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struct bio_list flush_bio_list;
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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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wait_queue_head_t copy_to_journal_wait;
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struct completion crypto_backoff;
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bool journal_uptodate;
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bool just_formatted;
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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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atomic64_t number_of_mismatches;
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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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struct dm_integrity_io {
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struct work_struct work;
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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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struct dm_integrity_range range;
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sector_t metadata_block;
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unsigned metadata_offset;
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atomic_t in_flight;
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blk_status_t bi_status;
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struct completion *completion;
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struct gendisk *orig_bi_disk;
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u8 orig_bi_partno;
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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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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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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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static struct kmem_cache *journal_io_cache;
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#define JOURNAL_IO_MEMPOOL 32
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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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* DM Integrity profile, protection is performed layer above (dm-crypt)
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*/
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static const 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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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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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 (err == -EILSEQ)
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atomic64_inc(&ic->number_of_mismatches);
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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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static int dm_integrity_failed(struct dm_integrity_c *ic)
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{
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return READ_ONCE(ic->failed);
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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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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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*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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#define sector_to_block(ic, n) \
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do { \
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BUG_ON((n) & (unsigned)((ic)->sectors_per_block - 1)); \
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(n) >>= (ic)->sb->log2_sectors_per_block; \
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} while (0)
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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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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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sector_to_block(ic, offset);
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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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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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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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result += (sector_t)ic->initial_sectors + offset;
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return result;
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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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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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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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return dm_io(&io_req, 1, &io_loc, NULL);
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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)
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unsigned limit = e ? ic->journal_section_entries : ic->journal_section_sectors;
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if (unlikely(section >= ic->journal_sections) ||
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unlikely(offset >= limit)) {
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printk(KERN_CRIT "%s: invalid access at (%u,%u), limit (%u,%u)\n",
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function, section, offset, ic->journal_sections, limit);
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BUG();
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}
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#endif
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}
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static void page_list_location(struct dm_integrity_c *ic, unsigned section, unsigned offset,
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unsigned *pl_index, unsigned *pl_offset)
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{
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unsigned sector;
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access_journal_check(ic, section, offset, false, "page_list_location");
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sector = section * ic->journal_section_sectors + offset;
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*pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
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*pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
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}
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static struct journal_sector *access_page_list(struct dm_integrity_c *ic, struct page_list *pl,
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unsigned section, unsigned offset, unsigned *n_sectors)
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{
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unsigned pl_index, pl_offset;
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char *va;
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page_list_location(ic, section, offset, &pl_index, &pl_offset);
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if (n_sectors)
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*n_sectors = (PAGE_SIZE - pl_offset) >> SECTOR_SHIFT;
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va = lowmem_page_address(pl[pl_index].page);
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return (struct journal_sector *)(va + pl_offset);
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}
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static struct journal_sector *access_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset)
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{
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return access_page_list(ic, ic->journal, section, offset, NULL);
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}
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static struct journal_entry *access_journal_entry(struct dm_integrity_c *ic, unsigned section, unsigned n)
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{
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unsigned rel_sector, offset;
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struct journal_sector *js;
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access_journal_check(ic, section, n, true, "access_journal_entry");
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rel_sector = n % JOURNAL_BLOCK_SECTORS;
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offset = n / JOURNAL_BLOCK_SECTORS;
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js = access_journal(ic, section, rel_sector);
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return (struct journal_entry *)((char *)js + offset * ic->journal_entry_size);
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}
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static struct journal_sector *access_journal_data(struct dm_integrity_c *ic, unsigned section, unsigned n)
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{
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n <<= ic->sb->log2_sectors_per_block;
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n += JOURNAL_BLOCK_SECTORS;
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access_journal_check(ic, section, n, false, "access_journal_data");
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return access_journal(ic, section, n);
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}
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static void section_mac(struct dm_integrity_c *ic, unsigned section, __u8 result[JOURNAL_MAC_SIZE])
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{
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SHASH_DESC_ON_STACK(desc, ic->journal_mac);
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int r;
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unsigned j, size;
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desc->tfm = ic->journal_mac;
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desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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r = crypto_shash_init(desc);
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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;
|
|
init_completion(&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;
|
|
init_completion(&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 | REQ_SYNC, 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;
|
|
init_completion(&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);
|
|
reinit_completion(&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;
|
|
init_completion(&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;
|
|
|
|
BUG_ON((target | n_sectors | offset) & (unsigned)(ic->sectors_per_block - 1));
|
|
|
|
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;
|
|
|
|
BUG_ON((new_range->logical_sector | new_range->n_sectors) & (unsigned)(ic->sectors_per_block - 1));
|
|
|
|
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_partial_buffer_dirty(b, *metadata_offset, *metadata_offset + to_copy);
|
|
} 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(struct timer_list *t)
|
|
{
|
|
struct dm_integrity_c *ic = from_timer(ic, t, autocommit_timer);
|
|
|
|
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;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ic->endio_wait.lock, flags);
|
|
bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
|
|
bio_list_add(&ic->flush_bio_list, bio);
|
|
spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
|
|
|
|
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_status)
|
|
bio->bi_status = errno_to_blk_status(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_status) && 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_status) && !bio->bi_status)
|
|
bio->bi_status = dio->bi_status;
|
|
if (likely(!bio->bi_status) && 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_disk = dio->orig_bi_disk;
|
|
bio->bi_partno = dio->orig_bi_partno;
|
|
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, ic->sectors_per_block << 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 = unlikely(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;
|
|
|
|
if (unlikely(ic->mode == 'R'))
|
|
goto skip_io;
|
|
|
|
checksums = kmalloc((PAGE_SIZE >> SECTOR_SHIFT >> ic->sb->log2_sectors_per_block) * 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 -= ic->sectors_per_block;
|
|
pos += ic->sectors_per_block << SECTOR_SHIFT;
|
|
sector += ic->sectors_per_block;
|
|
} 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;
|
|
atomic64_inc(&ic->number_of_mismatches);
|
|
}
|
|
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;
|
|
sector_to_block(ic, data_to_process);
|
|
data_to_process *= 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;
|
|
}
|
|
}
|
|
}
|
|
skip_io:
|
|
dec_in_flight(dio);
|
|
return;
|
|
error:
|
|
dio->bi_status = errno_to_blk_status(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));
|
|
struct bio_integrity_payload *bip;
|
|
|
|
sector_t area, offset;
|
|
|
|
dio->ic = ic;
|
|
dio->bi_status = 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 DM_MAPIO_KILL;
|
|
}
|
|
if (unlikely((dio->range.logical_sector | bio_sectors(bio)) & (unsigned)(ic->sectors_per_block - 1))) {
|
|
DMERR("Bio not aligned on %u sectors: 0x%llx, 0x%x",
|
|
ic->sectors_per_block,
|
|
(unsigned long long)dio->range.logical_sector, bio_sectors(bio));
|
|
return DM_MAPIO_KILL;
|
|
}
|
|
|
|
if (ic->sectors_per_block > 1) {
|
|
struct bvec_iter iter;
|
|
struct bio_vec bv;
|
|
bio_for_each_segment(bv, bio, iter) {
|
|
if (unlikely(bv.bv_len & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
|
|
DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary",
|
|
bv.bv_offset, bv.bv_len, ic->sectors_per_block);
|
|
return DM_MAPIO_KILL;
|
|
}
|
|
}
|
|
}
|
|
|
|
bip = bio_integrity(bio);
|
|
if (!ic->internal_hash) {
|
|
if (bip) {
|
|
unsigned wanted_tag_size = bio_sectors(bio) >> ic->sb->log2_sectors_per_block;
|
|
if (ic->log2_tag_size >= 0)
|
|
wanted_tag_size <<= ic->log2_tag_size;
|
|
else
|
|
wanted_tag_size *= ic->tag_size;
|
|
if (unlikely(wanted_tag_size != bip->bip_iter.bi_size)) {
|
|
DMERR("Invalid integrity data size %u, expected %u", bip->bip_iter.bi_size, wanted_tag_size);
|
|
return DM_MAPIO_KILL;
|
|
}
|
|
}
|
|
} else {
|
|
if (unlikely(bip != NULL)) {
|
|
DMERR("Unexpected integrity data when using internal hash");
|
|
return DM_MAPIO_KILL;
|
|
}
|
|
}
|
|
|
|
if (unlikely(ic->mode == 'R') && unlikely(dio->write))
|
|
return DM_MAPIO_KILL;
|
|
|
|
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;
|
|
char *mem_ptr;
|
|
unsigned s;
|
|
|
|
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);
|
|
mem_ptr = mem + bv.bv_offset;
|
|
s = 0;
|
|
do {
|
|
memcpy(mem_ptr, js, JOURNAL_SECTOR_DATA);
|
|
*(commit_id_t *)(mem_ptr + JOURNAL_SECTOR_DATA) = je->last_bytes[s];
|
|
js++;
|
|
mem_ptr += 1 << SECTOR_SHIFT;
|
|
} while (++s < ic->sectors_per_block);
|
|
#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, journal_entry_tag(ic, je), 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 = journal_entry_tag(ic, je);
|
|
|
|
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;
|
|
unsigned s;
|
|
|
|
js = access_journal_data(ic, journal_section, journal_entry);
|
|
memcpy(js, mem + bv.bv_offset, ic->sectors_per_block << SECTOR_SHIFT);
|
|
|
|
s = 0;
|
|
do {
|
|
je->last_bytes[s] = js[s].commit_id;
|
|
} while (++s < ic->sectors_per_block);
|
|
|
|
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(journal_entry_tag(ic, je), checksums_onstack, ic->tag_size);
|
|
} else
|
|
integrity_sector_checksum(ic, logical_sector, (char *)js, journal_entry_tag(ic, je));
|
|
}
|
|
|
|
journal_entry_set_sector(je, logical_sector);
|
|
}
|
|
logical_sector += ic->sectors_per_block;
|
|
|
|
journal_entry++;
|
|
if (unlikely(journal_entry == ic->journal_section_entries)) {
|
|
journal_entry = 0;
|
|
journal_section++;
|
|
wraparound_section(ic, &journal_section);
|
|
}
|
|
|
|
bv.bv_offset += ic->sectors_per_block << SECTOR_SHIFT;
|
|
} while (bv.bv_len -= ic->sectors_per_block << 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 (READ_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, range_sectors;
|
|
|
|
dio->range.n_sectors = min(dio->range.n_sectors,
|
|
ic->free_sectors << ic->sb->log2_sectors_per_block);
|
|
if (unlikely(!dio->range.n_sectors))
|
|
goto sleep;
|
|
range_sectors = dio->range.n_sectors >> ic->sb->log2_sectors_per_block;
|
|
ic->free_sectors -= range_sectors;
|
|
journal_section = ic->free_section;
|
|
journal_entry = ic->free_section_entry;
|
|
|
|
next_entry = ic->free_section_entry + range_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;
|
|
i = 0;
|
|
do {
|
|
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);
|
|
}
|
|
} while ((i += ic->sectors_per_block) < dio->range.n_sectors);
|
|
|
|
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;
|
|
unsigned jp = journal_read_pos + 1;
|
|
for (i = ic->sectors_per_block; i < dio->range.n_sectors; i += ic->sectors_per_block, jp++) {
|
|
if (!test_journal_node(ic, jp, 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) {
|
|
init_completion(&read_comp);
|
|
dio->completion = &read_comp;
|
|
} else
|
|
dio->completion = NULL;
|
|
|
|
dio->orig_bi_iter = bio->bi_iter;
|
|
|
|
dio->orig_bi_disk = bio->bi_disk;
|
|
dio->orig_bi_partno = bio->bi_partno;
|
|
bio_set_dev(bio, 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);
|
|
if (likely(!bio->bi_status))
|
|
integrity_metadata(&dio->work);
|
|
else
|
|
dec_in_flight(dio);
|
|
|
|
} 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++;
|
|
}
|
|
WARN_ON(ic->journal_sections * ic->journal_section_entries !=
|
|
(ic->n_uncommitted_sections + ic->n_committed_sections) * ic->journal_section_entries + ic->free_sectors);
|
|
}
|
|
|
|
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 (READ_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 restore_last_bytes(struct dm_integrity_c *ic, struct journal_sector *js,
|
|
struct journal_entry *je)
|
|
{
|
|
unsigned s = 0;
|
|
do {
|
|
js->commit_id = je->last_bytes[s];
|
|
js++;
|
|
} while (++s < ic->sectors_per_block);
|
|
}
|
|
|
|
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;
|
|
struct blk_plug plug;
|
|
|
|
blk_start_plug(&plug);
|
|
|
|
comp.ic = ic;
|
|
comp.in_flight = (atomic_t)ATOMIC_INIT(1);
|
|
init_completion(&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);
|
|
if (unlikely(from_replay)) {
|
|
if (unlikely(sec & (unsigned)(ic->sectors_per_block - 1))) {
|
|
dm_integrity_io_error(ic, "invalid sector in journal", -EIO);
|
|
sec &= ~(sector_t)(ic->sectors_per_block - 1);
|
|
}
|
|
}
|
|
get_area_and_offset(ic, sec, &area, &offset);
|
|
restore_last_bytes(ic, access_journal_data(ic, i, j), je);
|
|
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) << ic->sb->log2_sectors_per_block))
|
|
break;
|
|
restore_last_bytes(ic, access_journal_data(ic, i, k), je2);
|
|
}
|
|
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) << ic->sb->log2_sectors_per_block;
|
|
|
|
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 += ic->sectors_per_block;
|
|
offset += ic->sectors_per_block;
|
|
}
|
|
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) {
|
|
char test_tag[max(crypto_shash_digestsize(ic->internal_hash), ic->tag_size)];
|
|
|
|
integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block),
|
|
(char *)access_journal_data(ic, i, l), test_tag);
|
|
if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), 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, journal_entry_tag(ic, je2), &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 << ic->sb->log2_sectors_per_block,
|
|
(k - j) << ic->sb->log2_sectors_per_block,
|
|
get_data_sector(ic, area, offset),
|
|
complete_copy_from_journal, io);
|
|
skip_io:
|
|
j = next_loop;
|
|
}
|
|
}
|
|
|
|
dm_bufio_write_dirty_buffers_async(ic->bufio);
|
|
|
|
blk_finish_plug(&plug);
|
|
|
|
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 (READ_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->mode == 'R')
|
|
return;
|
|
|
|
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;
|
|
init_completion(&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:
|
|
DMEMIT("%llu", (unsigned long long)atomic64_read(&ic->number_of_mismatches));
|
|
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->sectors_per_block != 1;
|
|
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);
|
|
if (ic->sectors_per_block != 1)
|
|
DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT);
|
|
|
|
#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 dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *limits)
|
|
{
|
|
struct dm_integrity_c *ic = ti->private;
|
|
|
|
if (ic->sectors_per_block > 1) {
|
|
limits->logical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
|
|
limits->physical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
|
|
blk_limits_io_min(limits, ic->sectors_per_block << SECTOR_SHIFT);
|
|
}
|
|
}
|
|
|
|
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, last_bytes[ic->sectors_per_block]) + 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 << ic->sb->log2_sectors_per_block) + 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 - ic->sb->log2_sectors_per_block),
|
|
(__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;
|
|
|
|
memset(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT);
|
|
memcpy(ic->sb->magic, SB_MAGIC, 8);
|
|
ic->sb->version = SB_VERSION;
|
|
ic->sb->integrity_tag_size = cpu_to_le16(ic->tag_size);
|
|
ic->sb->log2_sectors_per_block = __ffs(ic->sectors_per_block);
|
|
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);
|
|
|
|
if (!interleave_sectors)
|
|
interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
|
|
ic->sb->log2_interleave_sectors = __fls(interleave_sectors);
|
|
ic->sb->log2_interleave_sectors = max((__u8)MIN_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
|
|
ic->sb->log2_interleave_sectors = min((__u8)MAX_LOG2_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 (!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;
|
|
bi.tag_size = bi.tuple_size;
|
|
bi.interval_exp = ic->sb->log2_sectors_per_block + SECTOR_SHIFT;
|
|
|
|
blk_integrity_register(disk, &bi);
|
|
blk_queue_max_integrity_segments(disk->queue, UINT_MAX);
|
|
}
|
|
|
|
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 = kvmalloc(page_list_desc_size, GFP_KERNEL | __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 = kvmalloc(ic->journal_sections * sizeof(struct scatterlist *), GFP_KERNEL | __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 = kvmalloc(n_pages * sizeof(struct scatterlist), GFP_KERNEL);
|
|
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) {
|
|
*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;
|
|
if (hex2bin(a->key, a->key_string, a->key_size))
|
|
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;
|
|
}
|
|
} else if (crypto_shash_get_flags(*hash) & CRYPTO_TFM_NEED_KEY) {
|
|
*error = error_key;
|
|
return -ENOKEY;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int create_journal(struct dm_integrity_c *ic, char **error)
|
|
{
|
|
int r = 0;
|
|
unsigned i;
|
|
__u64 journal_pages, journal_desc_size, journal_tree_size;
|
|
unsigned char *crypt_data = NULL, *crypt_iv = NULL;
|
|
struct skcipher_request *req = NULL;
|
|
|
|
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);
|
|
|
|
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) {
|
|
*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) {
|
|
*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)) {
|
|
*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) {
|
|
*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) {
|
|
*error = "Could not allocate memory for journal io";
|
|
r = -ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
if (blocksize == 1) {
|
|
struct scatterlist *sg;
|
|
|
|
req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
|
|
if (!req) {
|
|
*error = "Could not allocate crypt request";
|
|
r = -ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
crypt_iv = kmalloc(ivsize, GFP_KERNEL);
|
|
if (!crypt_iv) {
|
|
*error = "Could not allocate iv";
|
|
r = -ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
ic->journal_xor = dm_integrity_alloc_page_list(ic);
|
|
if (!ic->journal_xor) {
|
|
*error = "Could not allocate memory for journal xor";
|
|
r = -ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
sg = kvmalloc((ic->journal_pages + 1) * sizeof(struct scatterlist), GFP_KERNEL);
|
|
if (!sg) {
|
|
*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(crypt_iv, 0x00, ivsize);
|
|
|
|
skcipher_request_set_crypt(req, sg, sg, PAGE_SIZE * ic->journal_pages + sizeof ic->commit_ids, crypt_iv);
|
|
init_completion(&comp.comp);
|
|
comp.in_flight = (atomic_t)ATOMIC_INIT(1);
|
|
if (do_crypt(true, req, &comp))
|
|
wait_for_completion(&comp.comp);
|
|
kvfree(sg);
|
|
r = dm_integrity_failed(ic);
|
|
if (r) {
|
|
*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 {
|
|
unsigned crypt_len = roundup(ivsize, blocksize);
|
|
|
|
req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
|
|
if (!req) {
|
|
*error = "Could not allocate crypt request";
|
|
r = -ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
crypt_iv = kmalloc(ivsize, GFP_KERNEL);
|
|
if (!crypt_iv) {
|
|
*error = "Could not allocate iv";
|
|
r = -ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
crypt_data = kmalloc(crypt_len, GFP_KERNEL);
|
|
if (!crypt_data) {
|
|
*error = "Unable to allocate crypt data";
|
|
r = -ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
ic->journal_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal);
|
|
if (!ic->journal_scatterlist) {
|
|
*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) {
|
|
*error = "Unable to allocate sg list";
|
|
r = -ENOMEM;
|
|
goto bad;
|
|
}
|
|
ic->sk_requests = kvmalloc(ic->journal_sections * sizeof(struct skcipher_request *), GFP_KERNEL | __GFP_ZERO);
|
|
if (!ic->sk_requests) {
|
|
*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(crypt_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, crypt_iv);
|
|
init_completion(&comp.comp);
|
|
comp.in_flight = (atomic_t)ATOMIC_INIT(1);
|
|
if (do_crypt(true, req, &comp))
|
|
wait_for_completion(&comp.comp);
|
|
|
|
r = dm_integrity_failed(ic);
|
|
if (r) {
|
|
*error = "Unable to generate iv";
|
|
goto bad;
|
|
}
|
|
|
|
section_req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
|
|
if (!section_req) {
|
|
*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);
|
|
*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) {
|
|
*error = "Journal doesn't fit into memory";
|
|
r = -ENOMEM;
|
|
goto bad;
|
|
}
|
|
ic->journal_tree = kvmalloc(journal_tree_size, GFP_KERNEL);
|
|
if (!ic->journal_tree) {
|
|
*error = "Could not allocate memory for journal tree";
|
|
r = -ENOMEM;
|
|
}
|
|
bad:
|
|
kfree(crypt_data);
|
|
kfree(crypt_iv);
|
|
skcipher_request_free(req);
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Construct a integrity mapping
|
|
*
|
|
* Arguments:
|
|
* device
|
|
* offset from the start of the device
|
|
* tag size
|
|
* D - direct writes, J - journal writes, R - recovery mode
|
|
* number of optional arguments
|
|
* optional arguments:
|
|
* journal_sectors
|
|
* interleave_sectors
|
|
* buffer_sectors
|
|
* journal_watermark
|
|
* commit_time
|
|
* internal_hash
|
|
* journal_crypt
|
|
* journal_mac
|
|
* block_size
|
|
*/
|
|
static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
|
|
{
|
|
struct dm_integrity_c *ic;
|
|
char dummy;
|
|
int r;
|
|
unsigned extra_args;
|
|
struct dm_arg_set as;
|
|
static const struct dm_arg _args[] = {
|
|
{0, 9, "Invalid number of feature args"},
|
|
};
|
|
unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
|
|
bool should_write_sb;
|
|
__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->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);
|
|
atomic64_set(&ic->number_of_mismatches, 0);
|
|
|
|
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") || !strcmp(argv[3], "R"))
|
|
ic->mode = argv[3][0];
|
|
else {
|
|
ti->error = "Invalid mode (expecting J, D, R)";
|
|
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;
|
|
ic->sectors_per_block = 1;
|
|
|
|
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 (sscanf(opt_string, "block_size:%u%c", &val, &dummy) == 1) {
|
|
if (val < 1 << SECTOR_SHIFT ||
|
|
val > MAX_SECTORS_PER_BLOCK << SECTOR_SHIFT ||
|
|
(val & (val -1))) {
|
|
r = -EINVAL;
|
|
ti->error = "Invalid block_size argument";
|
|
goto bad;
|
|
}
|
|
ic->sectors_per_block = val >> SECTOR_SHIFT;
|
|
} 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;
|
|
timer_setup(&ic->autocommit_timer, autocommit_fn, 0);
|
|
|
|
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;
|
|
}
|
|
should_write_sb = false;
|
|
if (memcmp(ic->sb->magic, SB_MAGIC, 8)) {
|
|
if (ic->mode != 'R') {
|
|
if (memchr_inv(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT)) {
|
|
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;
|
|
}
|
|
if (ic->mode != 'R')
|
|
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 = "Tag size doesn't match the information in superblock";
|
|
goto bad;
|
|
}
|
|
if (ic->sb->log2_sectors_per_block != __ffs(ic->sectors_per_block)) {
|
|
r = -EINVAL;
|
|
ti->error = "Block size doesn't match the information in superblock";
|
|
goto bad;
|
|
}
|
|
if (!le32_to_cpu(ic->sb->journal_sections)) {
|
|
r = -EINVAL;
|
|
ti->error = "Corrupted superblock, journal_sections is 0";
|
|
goto bad;
|
|
}
|
|
/* make sure that ti->max_io_len doesn't overflow */
|
|
if (ic->sb->log2_interleave_sectors < MIN_LOG2_INTERLEAVE_SECTORS ||
|
|
ic->sb->log2_interleave_sectors > MAX_LOG2_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 (ti->len > ic->provided_data_sectors) {
|
|
r = -EINVAL;
|
|
ti->error = "Not enough provided sectors for requested mapping size";
|
|
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);
|
|
|
|
if (ic->mode != 'R') {
|
|
r = create_journal(ic, &ti->error);
|
|
if (r)
|
|
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, 1, 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,
|
|
.io_hints = dm_integrity_io_hints,
|
|
};
|
|
|
|
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");
|