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Verify that a filesystem check operation (fsck) does not report the following scenario as an error: An extent is shared between two inodes, as a result of clone/reflink operation, and for one of the inodes, lets call it inode A, the extent is referenced through a file extent item as a prealloc extent, while for the other inode, call it inode B, the extent is referenced through a regular file extent item, that is, it was written to. The goal of this test is to make sure a filesystem check operation will not report "odd csum items" errors for the prealloc extent at inode A, because this scenario is valid since the extent was written through inode B and therefore it is expected to have checksum items in the filesystem's checksum btree for that shared extent. Such scenario can be created with the following steps for example: mkfs.btrfs -f /dev/sdb mount /dev/sdb /mnt touch /mnt/foo xfs_io -c "falloc 0 256K" /mnt/foo sync xfs_io -c "pwrite -S 0xab 0 256K" /mnt/foo touch /mnt/bar xfs_io -c "reflink /mnt/foo 0 0 256K" /mnt/bar xfs_io -c "fsync" /mnt/bar <power fail> mount /dev/sdb /mnt umount /mnt This scenario is fixed by the following patch for the filesystem checker: "Btrfs-progs: check, fix false error reports for shared prealloc extents" Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
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| .. | ||
| reflinked-prealloc-extents.img.xz | ||
| test.sh | ||