From: Harshad Shirwadkar <[email protected]>
Add fast commit scan pass. Scan pass is responsible for following
things:
* Count total number of fast commit tags that need to be replayed
during the replay phase.
* Validate whether the fast commit area is valid for a given
transaction ID.
* Verify the CRC of fast commit area.
Signed-off-by: Harshad Shirwadkar <[email protected]>
---
e2fsck/journal.c | 109 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 109 insertions(+)
diff --git a/e2fsck/journal.c b/e2fsck/journal.c
index 56e48385..ba38124e 100644
--- a/e2fsck/journal.c
+++ b/e2fsck/journal.c
@@ -278,6 +278,108 @@ static int process_journal_block(ext2_filsys fs,
return 0;
}
+static int ext4_fc_replay_scan(journal_t *j, struct buffer_head *bh,
+ int off, tid_t expected_tid)
+{
+ e2fsck_t ctx = j->j_fs_dev->k_ctx;
+ struct e2fsck_fc_replay_state *state;
+ int ret = JBD2_FC_REPLAY_CONTINUE;
+ struct ext4_fc_add_range *ext;
+ struct ext4_fc_tl *tl;
+ struct ext4_fc_tail *tail;
+ __u8 *start, *end;
+ struct ext4_fc_head *head;
+ struct ext2fs_extent ext2fs_ex;
+
+ state = &ctx->fc_replay_state;
+
+ start = (__u8 *)bh->b_data;
+ end = (__u8 *)bh->b_data + j->j_blocksize - 1;
+
+ jbd_debug(1, "Scan phase starting, expected %d", expected_tid);
+ if (state->fc_replay_expected_off == 0) {
+ memset(state, 0, sizeof(*state));
+ /* Check if we can stop early */
+ if (le16_to_cpu(((struct ext4_fc_tl *)start)->fc_tag)
+ != EXT4_FC_TAG_HEAD) {
+ jbd_debug(1, "Ending early!, not a head tag");
+ return 0;
+ }
+ }
+
+ if (off != state->fc_replay_expected_off) {
+ ret = -EFSCORRUPTED;
+ goto out_err;
+ }
+
+ state->fc_replay_expected_off++;
+ fc_for_each_tl(start, end, tl) {
+ jbd_debug(3, "Scan phase, tag:%s, blk %lld\n",
+ tag2str(le16_to_cpu(tl->fc_tag)), bh->b_blocknr);
+ switch (le16_to_cpu(tl->fc_tag)) {
+ case EXT4_FC_TAG_ADD_RANGE:
+ ext = (struct ext4_fc_add_range *)ext4_fc_tag_val(tl);
+ ret = ext2fs_decode_extent(&ext2fs_ex, (void *)&ext->fc_ex,
+ sizeof(ext->fc_ex));
+ if (ret)
+ ret = JBD2_FC_REPLAY_STOP;
+ else
+ ret = JBD2_FC_REPLAY_CONTINUE;
+ case EXT4_FC_TAG_DEL_RANGE:
+ case EXT4_FC_TAG_LINK:
+ case EXT4_FC_TAG_UNLINK:
+ case EXT4_FC_TAG_CREAT:
+ case EXT4_FC_TAG_INODE:
+ case EXT4_FC_TAG_PAD:
+ state->fc_cur_tag++;
+ state->fc_crc = jbd2_chksum(j, state->fc_crc, tl,
+ sizeof(*tl) + ext4_fc_tag_len(tl));
+ break;
+ case EXT4_FC_TAG_TAIL:
+ state->fc_cur_tag++;
+ tail = (struct ext4_fc_tail *)ext4_fc_tag_val(tl);
+ state->fc_crc = jbd2_chksum(j, state->fc_crc, tl,
+ sizeof(*tl) +
+ offsetof(struct ext4_fc_tail,
+ fc_crc));
+ jbd_debug(1, "tail tid %d, expected %d\n",
+ le32_to_cpu(tail->fc_tid),
+ expected_tid);
+ if (le32_to_cpu(tail->fc_tid) == expected_tid &&
+ le32_to_cpu(tail->fc_crc) == state->fc_crc) {
+ state->fc_replay_num_tags = state->fc_cur_tag;
+ } else {
+ ret = state->fc_replay_num_tags ?
+ JBD2_FC_REPLAY_STOP : -EFSBADCRC;
+ }
+ state->fc_crc = 0;
+ break;
+ case EXT4_FC_TAG_HEAD:
+ head = (struct ext4_fc_head *)ext4_fc_tag_val(tl);
+ if (le32_to_cpu(head->fc_features) &
+ ~EXT4_FC_SUPPORTED_FEATURES) {
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ if (le32_to_cpu(head->fc_tid) != expected_tid) {
+ ret = -EINVAL;
+ break;
+ }
+ state->fc_cur_tag++;
+ state->fc_crc = jbd2_chksum(j, state->fc_crc, tl,
+ sizeof(*tl) + ext4_fc_tag_len(tl));
+ break;
+ default:
+ ret = state->fc_replay_num_tags ?
+ JBD2_FC_REPLAY_STOP : -ECANCELED;
+ }
+ if (ret < 0 || ret == JBD2_FC_REPLAY_STOP)
+ break;
+ }
+
+out_err:
+ return ret;
+}
/*
* Main recovery path entry point. This function returns JBD2_FC_REPLAY_CONTINUE
* to indicate that it is expecting more fast commit blocks. It returns
@@ -286,6 +388,13 @@ static int process_journal_block(ext2_filsys fs,
static int ext4_fc_replay(journal_t *journal, struct buffer_head *bh,
enum passtype pass, int off, tid_t expected_tid)
{
+ e2fsck_t ctx = journal->j_fs_dev->k_ctx;
+ struct e2fsck_fc_replay_state *state = &ctx->fc_replay_state;
+
+ if (pass == PASS_SCAN) {
+ state->fc_current_pass = PASS_SCAN;
+ return ext4_fc_replay_scan(journal, bh, off, expected_tid);
+ }
return JBD2_FC_REPLAY_STOP;
}
--
2.30.0.284.gd98b1dd5eaa7-goog