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btrfs: add BTRFS_IOC_ENCODED_WRITE

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The implementation resembles direct I/O: we have to flush any ordered
extents, invalidate the page cache, and do the io tree/delalloc/extent
map/ordered extent dance. From there, we can reuse the compression code
with a minor modification to distinguish the write from writeback. This
also creates inline extents when possible.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Omar Sandoval 2019-08-13 16:00:02 -07:00 • committed by David Sterba
commit 7c0c7269f7
8 changed files with 433 additions and 20 deletions
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