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Signed-off-by: David Sterba <dsterba@suse.cz>
67 lines
2.0 KiB
Plaintext
67 lines
2.0 KiB
Plaintext
btrfs-image(8)
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==============
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NAME
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----
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btrfs-image - create/restore an image of the filesystem
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SYNOPSIS
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--------
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*btrfs-image* [options] <source> <target>
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DESCRIPTION
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-----------
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*btrfs-image* is used to create an image of a btrfs filesystem.
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All data will be zeroed, but metadata and the like is preserved.
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Mainly used for debugging purposes.
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In the dump mode, source is the btrfs device/file and target is the output
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file (use '-' for stdout).
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In the restore mode (option -r), source is the dumped image and target is the btrfs device/file.
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OPTIONS
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-------
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-r::
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Restore metadump image. By default, this fixes super's chunk tree, by
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using 1 stripe pointing to primary device, so that file system can be
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restored by running tree log reply if possible. To restore without
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changing number of stripes in chunk tree check -o option.
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-c <value>::
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Compression level (0 ~ 9).
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-t <value>::
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Number of threads (1 ~ 32) to be used to process the image dump or restore.
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-o::
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Use the old restore method, this does not fixup the chunk tree so the restored
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file system will not be able to be mounted.
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-s::
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Sanitize the file names when generating the image. One -s means just
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generate random garbage, which means that the directory indexes won't match up
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since the hashes won't match with the garbage filenames. Using -ss will
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calculate a collision for the filename so that the hashes match, and if it
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can't calculate a collision then it will just generate garbage. The collision
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calculator is very time and CPU intensive so only use it if you are having
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problems with your file system tree and need to have it mostly working.
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-w::
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Walk all the trees manually and copy any blocks that are referenced. Use this
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option if your extent tree is corrupted to make sure that all of the metadata is
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captured.
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-m::
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Restore for multiple devices, more than 1 device should be provided.
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EXIT STATUS
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-----------
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*btrfs-image* will return 0 if no error happened.
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If any problems happened, 1 will be returned.
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SEE ALSO
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--------
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`mkfs.btrfs`(8)
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