jbd2: Fine tune estimate of necessary descriptor blocks
Currently we reserve j_max_transaction_buffers / 32 for transaction descriptor blocks. Now that revoke descriptors are accounted for separately this estimate is unnecessarily high and we can actually compute much tighter estimate. In the common case of 32k journal blocks and 4k blocksize this actually reduces the amount of reserved descriptor blocks from 256 to ~25 which allows us to fit more real data into a transaction. Signed-off-by:Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20191105164437.32602-25-jack@suse.czSigned-off-by:
Theodore Ts'o <tytso@mit.edu>
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