btrfs: use shared lock for direct writes within EOF

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Direct writes within EOF are safe to be performed with inode shared lock
to improve parallelization with other direct writes or reads because EOF
is not changed and there is no race with truncate().

Direct reads are already performed under shared inode lock.

This patch is precursor to removing btrfs_inode->dio_sem.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Goldwyn Rodrigues 2020-09-24 11:39:18 -05:00 • committed by David Sterba

parent c352370633

commit e9adabb971

1 changed files with 16 additions and 11 deletions

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fs/btrfs/file.c

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