43 lines
1.3 KiB
Bash
43 lines
1.3 KiB
Bash
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#!/bin/bash
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#
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# Verify that a filesystem check operation (fsck) does not report the following
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# scenario as an error:
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#
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# An extent is shared between two inodes, as a result of clone/reflink operation,
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# and for one of the inodes, lets call it inode A, the extent is referenced
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# through a file extent item as a prealloc extent, while for the other inode,
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# call it inode B, the extent is referenced through a regular file extent item,
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# that is, it was written to. The goal of this test is to make sure a filesystem
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# check operation will not report "odd csum items" errors for the prealloc
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# extent at inode A, because this scenario is valid since the extent was written
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# through inode B and therefore it is expected to have checksum items in the
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# filesystem's checksum btree for that shared extent.
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#
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# Such scenario can be created with the following steps for example:
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#
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# mkfs.btrfs -f /dev/sdb
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# mount /dev/sdb /mnt
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#
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# touch /mnt/foo
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# xfs_io -c "falloc 0 256K" /mnt/foo
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# sync
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#
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# xfs_io -c "pwrite -S 0xab 0 256K" /mnt/foo
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# touch /mnt/bar
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# xfs_io -c "reflink /mnt/foo 0 0 256K" /mnt/bar
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# xfs_io -c "fsync" /mnt/bar
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#
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# <power fail>
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# mount /dev/sdb /mnt
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# umount /mnt
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source "$TEST_TOP/common"
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check_prereq btrfs
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check_image() {
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run_check "$TOP/btrfs" check "$1"
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}
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check_all_images
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