btrfs: use per-buffer locking for extent_buffer reading

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Instead of locking and unlocking every page or the extent, just add a
new EXTENT_BUFFER_READING bit that mirrors EXTENT_BUFFER_WRITEBACK
for synchronizing threads trying to read an extent_buffer and to wait
for I/O completion.

Reviewed-by: Josef Bacik <josef@toxicpanda.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 2023-05-03 17:24:40 +02:00 • committed by David Sterba

parent 9e2aff90fc

commit d7172f52e9

2 changed files with 37 additions and 115 deletions

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150

fs/btrfs/extent_io.c

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2

fs/btrfs/extent_io.h

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