btrfs: push inode locking and unlocking into buffered/direct write
Push inode locking and unlocking closer to where we perform the I/O. For this we need to move the write checks inside the respective functions as well. pos is evaluated after generic_write_checks because O_APPEND can change iocb->ki_pos. Reviewed-by: Josef Bacik <josef@toxicpanda.com> 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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