1BTRFS-MAP-LOGICAL(8)             Btrfs Manual             BTRFS-MAP-LOGICAL(8)
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NAME

6       btrfs-map-logical - map btrfs logical extent to physical extent
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SYNOPSIS

9       btrfs-map-logical <options> <device>
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DESCRIPTION

12       btrfs-map-logical can be used to find out what the physical offsets are
13       on the mirrors, the result is dumped to stdout by default.
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15       Mainly used for debug purpose.
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OPTIONS

18       -l|--logical <logical_num>
19           Logical extent to map.
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21       -c|--copy <copy>
22           Copy of the extent to read(usually 1 or 2).
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24       -o|--output <filename>
25           Output file to hold the extent.
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27       -b|--bytes <bytes>
28           Number of bytes to read.
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EXIT STATUS

31       btrfs-map-logical will return 0 if no error happened. If any problems
32       happened, 1 will be returned.
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SEE ALSO

35       mkfs.btrfs(8)
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39Btrfs v5.6                        04/05/2020              BTRFS-MAP-LOGICAL(8)