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version 1.1, 2015/11/25 07:23:21
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version 1.2, 2016/08/26 19:35:19
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Line 14 difficulty="medium"
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Line 14 difficulty="medium"
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| duration="2-3 months" |
duration="2-3 months" |
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| description=""" |
description=""" |
| The fdiscard system call, and the file-system-level discard operation |
The fdiscard system call, and the file-system-level VOP_DISCARD operation |
| backing it, allow dropping ranges of blocks from files to create |
backing it, allow dropping ranges of blocks from files to create |
| sparse files with holes. |
sparse files with holes. |
| This is a simple generalization of truncate. |
This is a simple generalization of truncate. |
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Line 24 Discard is not currently implemented for
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Line 24 Discard is not currently implemented for
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| It should be possible to do so by generalizing the existing truncate |
It should be possible to do so by generalizing the existing truncate |
| code; this should be not super-difficult, but somewhat messy. |
code; this should be not super-difficult, but somewhat messy. |
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Note that it's important (for both the WAPBL and non-WAPBL cases) to |
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preserve the on-disk invariants needed for successful crash recovery. |
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| """ |
""" |
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| ]] |
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