Message-Id: <20210122054504.1498532-8-user@harshads-520.kir.corp.google.com>
Date:   Thu, 21 Jan 2021 21:45:03 -0800
From:   Harshad Shirwadkar <harshadshirwadkar@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     tytso@....edu, Harshad Shirwadkar <harshadshirwadkar@...il.com>
Subject: [PATCH v4 7/8] e2fsck: add replay for add_range, del_range, and inode tags

From: Harshad Shirwadkar <harshadshirwadkar@...il.com>

Add replay for inode's extent trees and inode itself.

Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@...il.com>
---
 e2fsck/journal.c | 348 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 347 insertions(+), 1 deletion(-)

diff --git a/e2fsck/journal.c b/e2fsck/journal.c
index 2afe0929..922c252d 100644
--- a/e2fsck/journal.c
+++ b/e2fsck/journal.c
@@ -394,6 +394,217 @@ static int __errcode_to_errno(errcode_t err, const char *func, int line)
 
 #define errcode_to_errno(err)	__errcode_to_errno(err, __func__, __LINE__)
 
+#define ex_end(__ex) ((__ex)->e_lblk + (__ex)->e_len - 1)
+#define ex_pend(__ex) ((__ex)->e_pblk + (__ex)->e_len - 1)
+
+static int make_room(struct extent_list *list, int i)
+{
+	int ret;
+
+	if (list->count == list->size) {
+		unsigned int new_size = (list->size + 341) *
+					sizeof(struct ext2fs_extent);
+		ret = errcode_to_errno(ext2fs_resize_mem(0, new_size, &list->extents));
+		if (ret)
+			return ret;
+		list->size += 341;
+	}
+
+	memmove(&list->extents[i + 1], &list->extents[i],
+			sizeof(list->extents[0]) * (list->count - i));
+	list->count++;
+	return 0;
+}
+
+static int ex_compar(const void *arg1, const void *arg2)
+{
+	struct ext2fs_extent *ex1 = (struct ext2fs_extent *)arg1;
+	struct ext2fs_extent *ex2 = (struct ext2fs_extent *)arg2;
+
+	if (ex1->e_lblk < ex2->e_lblk)
+		return -1;
+	if (ex1->e_lblk > ex2->e_lblk)
+		return 1;
+	return ex1->e_len - ex2->e_len;
+}
+
+static int ex_len_compar(const void *arg1, const void *arg2)
+{
+	struct ext2fs_extent *ex1 = (struct ext2fs_extent *)arg1;
+	struct ext2fs_extent *ex2 = (struct ext2fs_extent *)arg2;
+
+	if (ex1->e_len < ex2->e_len)
+		return 1;
+
+	if (ex1->e_lblk > ex2->e_lblk)
+		return -1;
+
+	return 0;
+}
+
+static void ex_sort_and_merge(e2fsck_t ctx, struct extent_list *list)
+{
+	blk64_t ex_end;
+	int i, j;
+
+	if (list->count < 2)
+		return;
+
+	/*
+	 * Reverse sort by length, that way we strip off all the 0 length
+	 * extents
+	 */
+	qsort(list->extents, list->count, sizeof(struct ext2fs_extent),
+		ex_len_compar);
+
+	for (i = 0; i < list->count; i++) {
+		if (list->extents[i].e_len == 0) {
+			list->count = i;
+			break;
+		}
+	}
+
+	/* Now sort by logical offset */
+	qsort(list->extents, list->count, sizeof(list->extents[0]),
+		ex_compar);
+
+	/* Merge adjacent extents if they are logically and physically contiguous */
+	i = 0;
+	while (i < list->count - 1) {
+		if (ex_end(&list->extents[i]) + 1 != list->extents[i + 1].e_lblk ||
+			ex_pend(&list->extents[i]) + 1 != list->extents[i + 1].e_pblk ||
+			(list->extents[i].e_flags & EXT2_EXTENT_FLAGS_UNINIT) !=
+				(list->extents[i + 1].e_flags & EXT2_EXTENT_FLAGS_UNINIT)) {
+			i++;
+			continue;
+		}
+
+		list->extents[i].e_len += list->extents[i + 1].e_len;
+		for (j = i + 1; j < list->count - 1; j++)
+			list->extents[j] = list->extents[j + 1];
+		list->count--;
+	}
+}
+
+/* must free blocks that are released */
+static int ext4_modify_extent_list(e2fsck_t ctx, struct extent_list *list,
+					struct ext2fs_extent *ex, int del)
+{
+	int ret;
+	int i, offset;
+	struct ext2fs_extent add_ex = *ex, add_ex2;
+
+	/* First let's create a hole from ex->e_lblk of length ex->e_len */
+	for (i = 0; i < list->count; i++) {
+		if (ex_end(&list->extents[i]) < add_ex.e_lblk)
+			continue;
+
+		/* Case 1: No overlap */
+		if (list->extents[i].e_lblk > ex_end(&add_ex))
+			break;
+		/*
+		 * Unmark all the blocks in bb now. All the blocks get marked
+		 * before we exit this function.
+		 */
+		ext2fs_unmark_block_bitmap_range2(ctx->fs->block_map,
+			list->extents[i].e_pblk, list->extents[i].e_len);
+		/* Case 2: Split */
+		if (list->extents[i].e_lblk < add_ex.e_lblk &&
+			ex_end(&list->extents[i]) > ex_end(&add_ex)) {
+			ret = make_room(list, i + 1);
+			if (ret)
+				return ret;
+			list->extents[i + 1] = list->extents[i];
+			offset = ex_end(&add_ex) + 1 - list->extents[i].e_lblk;
+			list->extents[i + 1].e_lblk += offset;
+			list->extents[i + 1].e_pblk += offset;
+			list->extents[i + 1].e_len -= offset;
+			list->extents[i].e_len =
+				add_ex.e_lblk - list->extents[i].e_lblk;
+			break;
+		}
+
+		/* Case 3: Exact overlap */
+		if (add_ex.e_lblk <= list->extents[i].e_lblk  &&
+			ex_end(&list->extents[i]) <= ex_end(&add_ex)) {
+
+			list->extents[i].e_len = 0;
+			continue;
+		}
+
+		/* Case 4: Partial overlap */
+		if (ex_end(&list->extents[i]) > ex_end(&add_ex)) {
+			offset = ex_end(&add_ex) + 1 - list->extents[i].e_lblk;
+			list->extents[i].e_lblk += offset;
+			list->extents[i].e_pblk += offset;
+			list->extents[i].e_len -= offset;
+			break;
+		}
+
+		if (ex_end(&add_ex) >= ex_end(&list->extents[i]))
+			list->extents[i].e_len =
+				add_ex.e_lblk > list->extents[i].e_lblk ?
+				add_ex.e_lblk - list->extents[i].e_lblk : 0;
+	}
+
+	if (add_ex.e_len && !del) {
+		make_room(list, list->count);
+		list->extents[list->count - 1] = add_ex;
+	}
+
+	ex_sort_and_merge(ctx, list);
+
+	/* Mark all occupied blocks allocated */
+	for (i = 0; i < list->count; i++)
+		ext2fs_mark_block_bitmap_range2(ctx->fs->block_map,
+			list->extents[i].e_pblk, list->extents[i].e_len);
+	ext2fs_mark_bb_dirty(ctx->fs);
+
+	return 0;
+}
+
+static int ext4_add_extent_to_list(e2fsck_t ctx, struct extent_list *list,
+					struct ext2fs_extent *ex)
+{
+	return ext4_modify_extent_list(ctx, list, ex, 0 /* add */);
+}
+
+static int ext4_del_extent_from_list(e2fsck_t ctx, struct extent_list *list,
+					struct ext2fs_extent *ex)
+{
+	return ext4_modify_extent_list(ctx, list, ex, 1 /* delete */);
+}
+
+static int ext4_fc_read_extents(e2fsck_t ctx, int ino)
+{
+	struct extent_list *extent_list = &ctx->fc_replay_state.fc_extent_list;
+
+	if (extent_list->ino == ino)
+		return 0;
+
+	extent_list->ino = ino;
+	return errcode_to_errno(e2fsck_read_extents(ctx, extent_list));
+}
+
+/*
+ * Flush extents in replay state on disk. @ino is the inode that is going
+ * to be processed next. So, we hold back flushing of the extent list
+ * if the next inode that's going to be processed is same as the one with
+ * cached extents in our replay state. That allows us to gather multiple extents
+ * for the inode so that we can flush all of them at once and it also saves us
+ * from continuously growing and shrinking the extent tree.
+ */
+static void ext4_fc_flush_extents(e2fsck_t ctx, int ino)
+{
+	struct extent_list *extent_list = &ctx->fc_replay_state.fc_extent_list;
+
+	if (extent_list->ino == ino || extent_list->ino == 0)
+		return;
+	e2fsck_rewrite_extent_tree(ctx, extent_list);
+	ext2fs_free_mem(&extent_list->extents);
+	memset(extent_list, 0, sizeof(*extent_list));
+}
+
 /* Helper struct for dentry replay routines */
 struct dentry_info_args {
 	int parent_ino, dname_len, ino, inode_len;
@@ -431,6 +642,7 @@ static int ext4_fc_handle_unlink(e2fsck_t ctx, struct ext4_fc_tl *tl)
 	int ret;
 
 	tl_to_darg(&darg, tl);
+	ext4_fc_flush_extents(ctx, darg.ino);
 	ret = errcode_to_errno(
 		       ext2fs_unlink(ctx->fs, darg.parent_ino,
 				     darg.dname, darg.ino, 0));
@@ -447,6 +659,7 @@ static int ext4_fc_handle_link_and_create(e2fsck_t ctx, struct ext4_fc_tl *tl)
 	int ret, filetype, mode;
 
 	tl_to_darg(&darg, tl);
+	ext4_fc_flush_extents(ctx, 0);
 	ret = errcode_to_errno(ext2fs_read_inode(fs, darg.ino,
 						 (struct ext2_inode *)&inode_large));
 	if (ret)
@@ -488,6 +701,132 @@ out:
 	return ret;
 
 }
+
+/* This function fixes the i_blocks field in the replayed indoe */
+static void ext4_fc_replay_fixup_iblocks(struct ext2_inode_large *ondisk_inode,
+	struct ext2_inode_large *fc_inode)
+{
+	if (le32_to_cpu(ondisk_inode->i_flags) & EXT4_EXTENTS_FL) {
+		struct ext3_extent_header *eh;
+
+		eh = (struct ext3_extent_header *)(&ondisk_inode->i_block[0]);
+		if (eh->eh_magic != EXT3_EXT_MAGIC) {
+			memset(eh, 0, sizeof(*eh));
+			eh->eh_magic = EXT3_EXT_MAGIC;
+			eh->eh_max = cpu_to_le16(
+				(sizeof(ondisk_inode->i_block) -
+					sizeof(struct ext3_extent_header)) /
+					sizeof(struct ext3_extent));
+		}
+	} else if (le32_to_cpu(ondisk_inode->i_flags) & EXT4_INLINE_DATA_FL) {
+		memcpy(ondisk_inode->i_block, fc_inode->i_block,
+			sizeof(fc_inode->i_block));
+	}
+}
+
+static int ext4_fc_handle_inode(e2fsck_t ctx, struct ext4_fc_tl *tl)
+{
+	struct e2fsck_fc_replay_state *state = &ctx->fc_replay_state;
+	int ino, inode_len = EXT2_GOOD_OLD_INODE_SIZE;
+	struct ext2_inode_large *inode = NULL;
+	struct ext4_fc_inode *fc_inode;
+	errcode_t err;
+	blk64_t blks;
+
+	fc_inode = (struct ext4_fc_inode *)ext4_fc_tag_val(tl);
+	ino = le32_to_cpu(fc_inode->fc_ino);
+
+	if (EXT2_INODE_SIZE(ctx->fs->super) > EXT2_GOOD_OLD_INODE_SIZE)
+		inode_len += ext2fs_le16_to_cpu(
+			((struct ext2_inode_large *)fc_inode->fc_raw_inode)
+				->i_extra_isize);
+	err = ext2fs_get_mem(inode_len, &inode);
+	if (err)
+		return errcode_to_errno(err);
+	ext4_fc_flush_extents(ctx, ino);
+
+	err = ext2fs_read_inode_full(ctx->fs, ino, (struct ext2_inode *)inode,
+					inode_len);
+	if (err)
+		goto out;
+	memcpy(inode, fc_inode->fc_raw_inode,
+		offsetof(struct ext2_inode_large, i_block));
+	memcpy(&inode->i_generation,
+		&((struct ext2_inode_large *)(fc_inode->fc_raw_inode))->i_generation,
+		inode_len - offsetof(struct ext2_inode_large, i_generation));
+	ext4_fc_replay_fixup_iblocks(inode,
+		(struct ext2_inode_large *)fc_inode->fc_raw_inode);
+	err = ext2fs_count_blocks(ctx->fs, ino, EXT2_INODE(inode), &blks);
+	if (err)
+		goto out;
+	ext2fs_iblk_set(ctx->fs, EXT2_INODE(inode), blks);
+	ext2fs_inode_csum_set(ctx->fs, ino, inode);
+
+	err = ext2fs_write_inode_full(ctx->fs, ino, (struct ext2_inode *)inode,
+					inode_len);
+	if (err)
+		goto out;
+	if (inode->i_links_count)
+		ext2fs_mark_inode_bitmap2(ctx->fs->inode_map, ino);
+	else
+		ext2fs_unmark_inode_bitmap2(ctx->fs->inode_map, ino);
+	ext2fs_mark_ib_dirty(ctx->fs);
+
+out:
+	ext2fs_free_mem(&inode);
+	return errcode_to_errno(err);
+}
+
+/*
+ * Handle add extent replay tag.
+ */
+static int ext4_fc_handle_add_extent(e2fsck_t ctx, struct ext4_fc_tl *tl)
+{
+	struct ext2fs_extent extent;
+	struct ext4_fc_add_range *add_range;
+	struct ext4_fc_del_range *del_range;
+	int ret = 0, ino;
+
+	add_range = (struct ext4_fc_add_range *)ext4_fc_tag_val(tl);
+	ino = le32_to_cpu(add_range->fc_ino);
+	ext4_fc_flush_extents(ctx, ino);
+
+	ret = ext4_fc_read_extents(ctx, ino);
+	if (ret)
+		return ret;
+	memset(&extent, 0, sizeof(extent));
+	ret = errcode_to_errno(ext2fs_decode_extent(
+			&extent, (void *)(add_range->fc_ex),
+			sizeof(add_range->fc_ex)));
+	if (ret)
+		return ret;
+	return ext4_add_extent_to_list(ctx,
+		&ctx->fc_replay_state.fc_extent_list, &extent);
+}
+
+/*
+ * Handle delete logical range replay tag.
+ */
+static int ext4_fc_handle_del_range(e2fsck_t ctx, struct ext4_fc_tl *tl)
+{
+	struct ext2fs_extent extent;
+	struct ext4_fc_del_range *del_range;
+	int ret, ino;
+
+	del_range = (struct ext4_fc_del_range *)ext4_fc_tag_val(tl);
+	ino = le32_to_cpu(del_range->fc_ino);
+	ext4_fc_flush_extents(ctx, ino);
+
+	memset(&extent, 0, sizeof(extent));
+	extent.e_lblk = ext2fs_le32_to_cpu(del_range->fc_lblk);
+	extent.e_len = ext2fs_le16_to_cpu(del_range->fc_len);
+	ret = ext4_fc_read_extents(ctx, ino);
+	if (ret)
+		return ret;
+	return ext4_del_extent_from_list(ctx,
+		&ctx->fc_replay_state.fc_extent_list, &extent);
+}
+
 /*
  * Main recovery path entry point. This function returns JBD2_FC_REPLAY_CONTINUE
  * to indicate that it is expecting more fast commit blocks. It returns
@@ -515,7 +854,7 @@ static int ext4_fc_replay(journal_t *journal, struct buffer_head *bh,
 		state->fc_current_pass = pass;
 		/* We will reset checksums */
 		ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
-		ret = ext2fs_read_bitmaps(ctx->fs);
+		ret = errcode_to_errno(ext2fs_read_bitmaps(ctx->fs));
 		if (ret) {
 			jbd_debug(1, "Error %d while reading bitmaps\n", ret);
 			return ret;
@@ -551,9 +890,16 @@ static int ext4_fc_replay(journal_t *journal, struct buffer_head *bh,
 			ret = ext4_fc_handle_unlink(ctx, tl);
 			break;
 		case EXT4_FC_TAG_ADD_RANGE:
+			ret = ext4_fc_handle_add_extent(ctx, tl);
+			break;
 		case EXT4_FC_TAG_DEL_RANGE:
+			ret = ext4_fc_handle_del_range(ctx, tl);
+			break;
 		case EXT4_FC_TAG_INODE:
+			ret = ext4_fc_handle_inode(ctx, tl);
+			break;
 		case EXT4_FC_TAG_TAIL:
+			ext4_fc_flush_extents(ctx, 0);
 		case EXT4_FC_TAG_PAD:
 		case EXT4_FC_TAG_HEAD:
 			break;
-- 
2.30.0.280.ga3ce27912f-goog

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