btrfs: embed a btrfs_bio into struct compressed_bio

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Embed a btrfs_bio into struct compressed_bio.  This avoids potential
(so far theoretical) deadlocks due to nesting of btrfs_bioset allocations
for the original read bio and the compressed bio, and avoids an extra
memory allocation in the I/O path.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

Christoph Hellwig 2023-02-10 08:48:34 +01:00 • committed by David Sterba

parent 18d758a2d8

commit 544fe4a903

5 changed files with 83 additions and 109 deletions

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146

fs/btrfs/compression.c

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17

fs/btrfs/compression.h

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2

fs/btrfs/extent_io.c

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24

fs/btrfs/inode.c

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3

fs/btrfs/lzo.c

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