#include "ext4_config.h"
#include "ext4_types.h"
#include "ext4_fs.h"
+#include "ext4_super.h"
#include "ext4_errno.h"
#include "ext4_blockdev.h"
#include "ext4_crc32c.h"
#include "ext4_debug.h"
+#include "tree.h"
#include <string.h>
+#include <malloc.h>
+
+struct revoke_entry {
+ ext4_fsblk_t block;
+ uint32_t trans_id;
+ RB_ENTRY(revoke_entry) revoke_node;
+};
+
+struct recover_info {
+ uint32_t start_trans_id;
+ uint32_t last_trans_id;
+ uint32_t this_trans_id;
+ RB_HEAD(jbd_revoke, revoke_entry) revoke_root;
+};
+
+struct replay_arg {
+ struct recover_info *info;
+ uint32_t *this_block;
+};
+
+static int
+jbd_revoke_entry_cmp(struct revoke_entry *a, struct revoke_entry *b)
+{
+ if (a->block > b->block)
+ return 1;
+ else if (a->block < b->block)
+ return -1;
+ return 0;
+}
+
+RB_GENERATE_INTERNAL(jbd_revoke, revoke_entry, revoke_node,
+ jbd_revoke_entry_cmp, static inline)
+
+#define jbd_alloc_revoke_entry() calloc(1, sizeof(struct revoke_entry))
+#define jbd_free_revoke_entry(addr) free(addr)
+
+int jbd_inode_bmap(struct jbd_fs *jbd_fs,
+ ext4_lblk_t iblock,
+ ext4_fsblk_t *fblock);
+
+int jbd_sb_write(struct jbd_fs *jbd_fs, struct jbd_sb *s)
+{
+ int rc;
+ struct ext4_fs *fs = jbd_fs->inode_ref.fs;
+ uint64_t offset;
+ ext4_fsblk_t fblock;
+ rc = jbd_inode_bmap(jbd_fs, 0, &fblock);
+ if (rc != EOK)
+ return rc;
+
+ offset = fblock * ext4_sb_get_block_size(&fs->sb);
+ return ext4_block_writebytes(fs->bdev, offset, s,
+ EXT4_SUPERBLOCK_SIZE);
+}
+
+int jbd_sb_read(struct jbd_fs *jbd_fs, struct jbd_sb *s)
+{
+ int rc;
+ struct ext4_fs *fs = jbd_fs->inode_ref.fs;
+ uint64_t offset;
+ ext4_fsblk_t fblock;
+ rc = jbd_inode_bmap(jbd_fs, 0, &fblock);
+ if (rc != EOK)
+ return rc;
+
+ offset = fblock * ext4_sb_get_block_size(&fs->sb);
+ return ext4_block_readbytes(fs->bdev, offset, s,
+ EXT4_SUPERBLOCK_SIZE);
+}
+
+static bool jbd_verify_sb(struct jbd_sb *sb)
+{
+ struct jbd_bhdr *header = &sb->header;
+ if (jbd_get32(header, magic) != JBD_MAGIC_NUMBER)
+ return false;
+
+ if (jbd_get32(header, blocktype) != JBD_SUPERBLOCK &&
+ jbd_get32(header, blocktype) != JBD_SUPERBLOCK_V2)
+ return false;
+
+ return true;
+}
int jbd_get_fs(struct ext4_fs *fs,
struct jbd_fs *jbd_fs)
rc = ext4_fs_get_inode_ref(fs,
journal_ino,
&jbd_fs->inode_ref);
+ if (rc != EOK) {
+ memset(jbd_fs, 0, sizeof(struct jbd_fs));
+ return rc;
+ }
+ rc = jbd_sb_read(jbd_fs, &jbd_fs->sb);
+ if (rc != EOK) {
+ memset(jbd_fs, 0, sizeof(struct jbd_fs));
+ ext4_fs_put_inode_ref(&jbd_fs->inode_ref);
+ }
+
return rc;
}
int jbd_put_fs(struct jbd_fs *jbd_fs)
{
int rc;
+ if (jbd_fs->dirty)
+ jbd_sb_write(jbd_fs, &jbd_fs->sb);
+
rc = ext4_fs_put_inode_ref(&jbd_fs->inode_ref);
return rc;
}
-int jbd_bmap(struct jbd_fs *jbd_fs,
- ext4_lblk_t iblock,
- ext4_fsblk_t *fblock)
+int jbd_inode_bmap(struct jbd_fs *jbd_fs,
+ ext4_lblk_t iblock,
+ ext4_fsblk_t *fblock)
{
int rc = ext4_fs_get_inode_data_block_index(
&jbd_fs->inode_ref,
false);
return rc;
}
+
+int jbd_block_get(struct jbd_fs *jbd_fs,
+ struct ext4_block *block,
+ ext4_fsblk_t fblock)
+{
+ /* TODO: journal device. */
+ int rc;
+ ext4_lblk_t iblock = (ext4_lblk_t)fblock;
+ rc = jbd_inode_bmap(jbd_fs, iblock,
+ &fblock);
+ if (rc != EOK)
+ return rc;
+
+ struct ext4_blockdev *bdev = jbd_fs->inode_ref.fs->bdev;
+ rc = ext4_block_get(bdev, block, fblock);
+ return rc;
+}
+
+int jbd_block_get_noread(struct jbd_fs *jbd_fs,
+ struct ext4_block *block,
+ ext4_fsblk_t fblock)
+{
+ /* TODO: journal device. */
+ int rc;
+ ext4_lblk_t iblock = (ext4_lblk_t)fblock;
+ rc = jbd_inode_bmap(jbd_fs, iblock,
+ &fblock);
+ if (rc != EOK)
+ return rc;
+
+ struct ext4_blockdev *bdev = jbd_fs->inode_ref.fs->bdev;
+ rc = ext4_block_get_noread(bdev, block, fblock);
+ return rc;
+}
+
+int jbd_block_set(struct jbd_fs *jbd_fs,
+ struct ext4_block *block)
+{
+ return ext4_block_set(jbd_fs->inode_ref.fs->bdev,
+ block);
+}
+
+/*
+ * helper functions to deal with 32 or 64bit block numbers.
+ */
+int jbd_tag_bytes(struct jbd_fs *jbd_fs)
+{
+ int size;
+
+ if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
+ JBD_FEATURE_INCOMPAT_CSUM_V3))
+ return sizeof(struct jbd_block_tag3);
+
+ size = sizeof(struct jbd_block_tag);
+
+ if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
+ JBD_FEATURE_INCOMPAT_CSUM_V2))
+ size += sizeof(uint16_t);
+
+ if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
+ JBD_FEATURE_INCOMPAT_64BIT))
+ return size;
+
+ return size - sizeof(uint32_t);
+}
+
+static void
+jbd_extract_block_tag(struct jbd_fs *jbd_fs,
+ uint32_t tag_bytes,
+ void *__tag,
+ ext4_fsblk_t *block,
+ bool *uuid_exist,
+ uint8_t *uuid,
+ bool *last_tag)
+{
+ char *uuid_start;
+ *uuid_exist = false;
+ *last_tag = false;
+ if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
+ JBD_FEATURE_INCOMPAT_CSUM_V3)) {
+ struct jbd_block_tag3 *tag = __tag;
+ *block = jbd_get32(tag, blocknr);
+ if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
+ JBD_FEATURE_INCOMPAT_64BIT))
+ *block |= (uint64_t)jbd_get32(tag, blocknr_high) << 32;
+
+ if (jbd_get32(tag, flags) & JBD_FLAG_ESCAPE)
+ *block = 0;
+
+ if (!(jbd_get32(tag, flags) & JBD_FLAG_SAME_UUID)) {
+ uuid_start = (char *)tag + tag_bytes;
+ *uuid_exist = true;
+ memcpy(uuid, uuid_start, UUID_SIZE);
+ }
+
+ if (jbd_get32(tag, flags) & JBD_FLAG_LAST_TAG)
+ *last_tag = true;
+
+ } else {
+ struct jbd_block_tag *tag = __tag;
+ *block = jbd_get32(tag, blocknr);
+ if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
+ JBD_FEATURE_INCOMPAT_64BIT))
+ *block |= (uint64_t)jbd_get32(tag, blocknr_high) << 32;
+
+ if (jbd_get16(tag, flags) & JBD_FLAG_ESCAPE)
+ *block = 0;
+
+ if (!(jbd_get16(tag, flags) & JBD_FLAG_SAME_UUID)) {
+ uuid_start = (char *)tag + tag_bytes;
+ *uuid_exist = true;
+ memcpy(uuid, uuid_start, UUID_SIZE);
+ }
+
+ if (jbd_get16(tag, flags) & JBD_FLAG_LAST_TAG)
+ *last_tag = true;
+
+ }
+}
+
+static void
+jbd_iterate_block_table(struct jbd_fs *jbd_fs,
+ void *__tag_start,
+ uint32_t tag_tbl_size,
+ void (*func)(struct jbd_fs * jbd_fs,
+ ext4_fsblk_t block,
+ uint8_t *uuid,
+ void *arg),
+ void *arg)
+{
+ ext4_fsblk_t block = 0;
+ uint8_t uuid[UUID_SIZE];
+ char *tag_start, *tag_ptr;
+ uint32_t tag_bytes = jbd_tag_bytes(jbd_fs);
+ tag_start = __tag_start;
+ tag_ptr = tag_start;
+
+ if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
+ JBD_FEATURE_INCOMPAT_CSUM_V2) ||
+ JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
+ JBD_FEATURE_INCOMPAT_CSUM_V3))
+ tag_tbl_size -= sizeof(struct jbd_block_tail);
+
+ while (tag_ptr - tag_start + tag_bytes <= tag_tbl_size) {
+ bool uuid_exist;
+ bool last_tag;
+ jbd_extract_block_tag(jbd_fs,
+ tag_bytes,
+ tag_ptr,
+ &block,
+ &uuid_exist,
+ uuid,
+ &last_tag);
+ if (func)
+ func(jbd_fs, block, uuid, arg);
+
+ if (last_tag)
+ break;
+
+ tag_ptr += tag_bytes;
+ if (uuid_exist)
+ tag_ptr += UUID_SIZE;
+
+ }
+}
+
+static void jbd_display_block_tags(struct jbd_fs *jbd_fs,
+ ext4_fsblk_t block,
+ uint8_t *uuid,
+ void *arg)
+{
+ uint32_t *iblock = arg;
+ ext4_dbg(DEBUG_JBD, "Block in block_tag: %" PRIu64 "\n", block);
+ (*iblock)++;
+ (void)jbd_fs;
+ (void)uuid;
+ return;
+}
+
+static struct revoke_entry *
+jbd_revoke_entry_lookup(struct recover_info *info, ext4_fsblk_t block)
+{
+ struct revoke_entry tmp = {
+ .block = block
+ };
+
+ return RB_FIND(jbd_revoke, &info->revoke_root, &tmp);
+}
+
+static void jbd_replay_block_tags(struct jbd_fs *jbd_fs,
+ ext4_fsblk_t block,
+ uint8_t *uuid __unused,
+ void *__arg)
+{
+ int r;
+ struct replay_arg *arg = __arg;
+ struct recover_info *info = arg->info;
+ uint32_t *this_block = arg->this_block;
+ struct revoke_entry *revoke_entry;
+ struct ext4_block journal_block, ext4_block;
+ ext4_dbg(DEBUG_JBD,
+ "Replaying block in block_tag: %" PRIu64 "\n",
+ block);
+ (*this_block)++;
+
+ revoke_entry = jbd_revoke_entry_lookup(info, block);
+ if (revoke_entry)
+ return;
+
+ r = jbd_block_get(jbd_fs, &journal_block, *this_block);
+ if (r != EOK)
+ return;
+
+ r = ext4_block_get_noread(jbd_fs->bdev, &ext4_block, block);
+ if (r != EOK) {
+ jbd_block_set(jbd_fs, &journal_block);
+ return;
+ }
+
+ memcpy(ext4_block.data,
+ journal_block.data,
+ jbd_get32(&jbd_fs->sb, blocksize));
+
+ ext4_block.dirty = true;
+ ext4_block_set(jbd_fs->bdev, &ext4_block);
+ jbd_block_set(jbd_fs, &journal_block);
+
+ return;
+}
+
+static void jbd_add_revoke_block_tags(struct recover_info *info,
+ ext4_fsblk_t block)
+{
+ struct revoke_entry *revoke_entry;
+
+ ext4_dbg(DEBUG_JBD, "Add block %" PRIu64 " to revoke tree\n", block);
+ revoke_entry = jbd_revoke_entry_lookup(info, block);
+ if (revoke_entry) {
+ revoke_entry->trans_id = info->this_trans_id;
+ return;
+ }
+
+ revoke_entry = jbd_alloc_revoke_entry();
+ ext4_assert(revoke_entry);
+ revoke_entry->block = block;
+ revoke_entry->trans_id = info->this_trans_id;
+ RB_INSERT(jbd_revoke, &info->revoke_root, revoke_entry);
+
+ return;
+}
+
+static void jbd_destroy_revoke_tree(struct recover_info *info)
+{
+ while (!RB_EMPTY(&info->revoke_root)) {
+ struct revoke_entry *revoke_entry =
+ RB_MIN(jbd_revoke, &info->revoke_root);
+ ext4_assert(revoke_entry);
+ RB_REMOVE(jbd_revoke, &info->revoke_root, revoke_entry);
+ jbd_free_revoke_entry(revoke_entry);
+ }
+}
+
+/* Make sure we wrap around the log correctly! */
+#define wrap(sb, var) \
+do { \
+ if (var >= jbd_get32((sb), maxlen)) \
+ var -= (jbd_get32((sb), maxlen) - jbd_get32((sb), first)); \
+} while (0)
+
+#define ACTION_SCAN 0
+#define ACTION_REVOKE 1
+#define ACTION_RECOVER 2
+
+
+static void jbd_build_revoke_tree(struct jbd_fs *jbd_fs,
+ struct jbd_bhdr *header,
+ struct recover_info *info)
+{
+ char *blocks_entry;
+ struct jbd_revoke_header *revoke_hdr =
+ (struct jbd_revoke_header *)header;
+ uint32_t i, nr_entries, record_len = 4;
+ if (JBD_HAS_INCOMPAT_FEATURE(&jbd_fs->sb,
+ JBD_FEATURE_INCOMPAT_64BIT))
+ record_len = 8;
+
+ nr_entries = (revoke_hdr->count -
+ sizeof(struct jbd_revoke_header)) /
+ record_len;
+
+ blocks_entry = (char *)(revoke_hdr + 1);
+
+ for (i = 0;i < nr_entries;i++) {
+ if (record_len == 8) {
+ uint64_t *blocks =
+ (uint64_t *)blocks_entry;
+ jbd_add_revoke_block_tags(info, *blocks);
+ } else {
+ uint32_t *blocks =
+ (uint32_t *)blocks_entry;
+ jbd_add_revoke_block_tags(info, *blocks);
+ }
+ blocks_entry += record_len;
+ }
+}
+
+static void jbd_debug_descriptor_block(struct jbd_fs *jbd_fs,
+ struct jbd_bhdr *header,
+ uint32_t *iblock)
+{
+ jbd_iterate_block_table(jbd_fs,
+ header + 1,
+ jbd_get32(&jbd_fs->sb, blocksize) -
+ sizeof(struct jbd_bhdr),
+ jbd_display_block_tags,
+ iblock);
+}
+
+static void jbd_replay_descriptor_block(struct jbd_fs *jbd_fs,
+ struct jbd_bhdr *header,
+ struct replay_arg *arg)
+{
+ jbd_iterate_block_table(jbd_fs,
+ header + 1,
+ jbd_get32(&jbd_fs->sb, blocksize) -
+ sizeof(struct jbd_bhdr),
+ jbd_replay_block_tags,
+ arg);
+}
+
+int jbd_iterate_log(struct jbd_fs *jbd_fs,
+ struct recover_info *info,
+ int action)
+{
+ int r = EOK;
+ bool log_end = false;
+ struct jbd_sb *sb = &jbd_fs->sb;
+ uint32_t start_trans_id, this_trans_id;
+ uint32_t start_block, this_block;
+
+ start_trans_id = this_trans_id = jbd_get32(sb, sequence);
+ start_block = this_block = jbd_get32(sb, start);
+
+ ext4_dbg(DEBUG_JBD, "Start of journal at trans id: %" PRIu32 "\n",
+ start_trans_id);
+
+ while (!log_end) {
+ struct ext4_block block;
+ struct jbd_bhdr *header;
+ if (action != ACTION_SCAN)
+ if (this_trans_id > info->last_trans_id) {
+ log_end = true;
+ continue;
+ }
+
+ r = jbd_block_get(jbd_fs, &block, this_block);
+ if (r != EOK)
+ break;
+
+ header = (struct jbd_bhdr *)block.data;
+ if (jbd_get32(header, magic) != JBD_MAGIC_NUMBER) {
+ jbd_block_set(jbd_fs, &block);
+ log_end = true;
+ continue;
+ }
+
+ if (jbd_get32(header, sequence) != this_trans_id) {
+ if (action != ACTION_SCAN)
+ r = EIO;
+
+ jbd_block_set(jbd_fs, &block);
+ log_end = true;
+ continue;
+ }
+
+ switch (jbd_get32(header, blocktype)) {
+ case JBD_DESCRIPTOR_BLOCK:
+ ext4_dbg(DEBUG_JBD, "Descriptor block: %u, "
+ "trans_id: %u\n",
+ this_block, this_trans_id);
+ if (action == ACTION_SCAN)
+ jbd_debug_descriptor_block(jbd_fs,
+ header, &this_block);
+ else if (action == ACTION_RECOVER) {
+ struct replay_arg replay_arg;
+ replay_arg.info = info;
+ replay_arg.this_block = &this_block;
+ jbd_replay_descriptor_block(jbd_fs,
+ header, &replay_arg);
+ }
+
+ break;
+ case JBD_COMMIT_BLOCK:
+ ext4_dbg(DEBUG_JBD, "Commit block: %u, "
+ "trans_id: %u\n",
+ this_block, this_trans_id);
+ this_trans_id++;
+ break;
+ case JBD_REVOKE_BLOCK:
+ ext4_dbg(DEBUG_JBD, "Revoke block: %u, "
+ "trans_id: %u\n",
+ this_block, this_trans_id);
+ if (action == ACTION_REVOKE) {
+ info->this_trans_id = this_trans_id;
+ jbd_build_revoke_tree(jbd_fs,
+ header, info);
+ }
+ break;
+ default:
+ log_end = true;
+ break;
+ }
+ jbd_block_set(jbd_fs, &block);
+ this_block++;
+ wrap(sb, this_block);
+ if (this_block == start_block)
+ log_end = true;
+
+ }
+ ext4_dbg(DEBUG_JBD, "End of journal.\n");
+ if (r == EOK && action == ACTION_SCAN) {
+ info->start_trans_id = start_trans_id;
+ if (this_trans_id > start_trans_id)
+ info->last_trans_id = this_trans_id - 1;
+ else
+ info->last_trans_id = this_trans_id;
+ }
+
+ return r;
+}
+
+int jbd_recover(struct jbd_fs *jbd_fs)
+{
+ int r;
+ struct recover_info info;
+ struct jbd_sb *sb = &jbd_fs->sb;
+ if (!sb->start)
+ return EOK;
+
+ RB_INIT(&info.revoke_root);
+
+ r = jbd_iterate_log(jbd_fs, &info, ACTION_SCAN);
+ if (r != EOK)
+ return r;
+
+ r = jbd_iterate_log(jbd_fs, &info, ACTION_REVOKE);
+ if (r != EOK)
+ return r;
+
+ r = jbd_iterate_log(jbd_fs, &info, ACTION_RECOVER);
+ if (r == EOK) {
+ jbd_set32(&jbd_fs->sb, start, 0);
+ jbd_fs->dirty = true;
+ }
+ jbd_destroy_revoke_tree(&info);
+ return r;
+}
projects / lwext4.git / blobdiff