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block: introduce preallocate filter

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It's intended to be inserted between format and protocol nodes to
preallocate additional space (expanding protocol file) on writes
crossing EOF. It improves performance for file-systems with slow
allocation.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20201021145859.11201-9-vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
[mreitz: Two comment fixes, and bumped the version from 5.2 to 6.0]
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2020-10-21 17:58:46 +03:00 • committed by Max Reitz
parent 9530a25b8b
commit 33fa2222eb
4 changed files with 605 additions and 1 deletions
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block/meson.build
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@ -12,6 +12,7 @@ block_ss.add(files(
'block-copy.c',
'commit.c',
'copy-on-read.c',
'preallocate.c',
'create.c',
'crypto.c',
'dirty-bitmap.c',