add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/ext4/fsmap.c
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@@ -280,7 +280,7 @@
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 	/* Fabricate an rmap entry for the external log device. */
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 	irec.fmr_physical = journal->j_blk_offset;
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-	irec.fmr_length = journal->j_maxlen;
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+	irec.fmr_length = journal->j_total_len;
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 	irec.fmr_owner = EXT4_FMR_OWN_LOG;
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 	irec.fmr_flags = 0;
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@@ -486,6 +486,8 @@
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 		keys[0].fmr_physical = bofs;
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 	if (keys[1].fmr_physical >= eofs)
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 		keys[1].fmr_physical = eofs - 1;
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+	if (keys[1].fmr_physical < keys[0].fmr_physical)
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+		return 0;
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 	start_fsb = keys[0].fmr_physical;
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 	end_fsb = keys[1].fmr_physical;
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@@ -574,8 +576,8 @@
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 	if (fm->fmr_device == 0 || fm->fmr_device == UINT_MAX ||
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 	    fm->fmr_device == new_encode_dev(sb->s_bdev->bd_dev))
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 		return true;
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-	if (EXT4_SB(sb)->journal_bdev &&
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-	    fm->fmr_device == new_encode_dev(EXT4_SB(sb)->journal_bdev->bd_dev))
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+	if (EXT4_SB(sb)->s_journal_bdev &&
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+	    fm->fmr_device == new_encode_dev(EXT4_SB(sb)->s_journal_bdev->bd_dev))
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 		return true;
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 	return false;
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 }
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@@ -629,7 +631,7 @@
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 {
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 	struct ext4_fsmap dkeys[2];	/* per-dev keys */
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 	struct ext4_getfsmap_dev handlers[EXT4_GETFSMAP_DEVS];
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-	struct ext4_getfsmap_info info = {0};
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+	struct ext4_getfsmap_info info = { NULL };
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 	int i;
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 	int error = 0;
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@@ -645,9 +647,9 @@
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 	memset(handlers, 0, sizeof(handlers));
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 	handlers[0].gfd_dev = new_encode_dev(sb->s_bdev->bd_dev);
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 	handlers[0].gfd_fn = ext4_getfsmap_datadev;
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-	if (EXT4_SB(sb)->journal_bdev) {
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+	if (EXT4_SB(sb)->s_journal_bdev) {
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 		handlers[1].gfd_dev = new_encode_dev(
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-				EXT4_SB(sb)->journal_bdev->bd_dev);
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+				EXT4_SB(sb)->s_journal_bdev->bd_dev);
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 		handlers[1].gfd_fn = ext4_getfsmap_logdev;
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 	}
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