tree 6859cf49f8043ec11846e2c8ebc836499e1048c4
parent 0ef90db93a4ddfc300af288c2a1bfc1e6c79da64
author Theodore Ts'o <tytso@mit.edu> 1249869673 -0400
committer Theodore Ts'o <tytso@mit.edu> 1249869673 -0400

ext4: Fix bugs in mballoc's stream allocation mode

The logic around sbi->s_mb_last_group and sbi->s_mb_last_start was all
screwed up.  These fields were getting unconditionally all the time,
set even when stream allocation had not taken place, and if they were
being used when the file was smaller than s_mb_stream_request, which
is when the allocation should _not_ be doing stream allocation.

Fix this by determining whether or not we stream allocation should
take place once, in ext4_mb_group_or_file(), and setting a flag which
gets used in ext4_mb_regular_allocator() and ext4_mb_use_best_found().
This simplifies the code and assures that we are consistently using
(or not using) the stream allocation logic.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>