Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
Pull ext4 fix from Ted Ts'o:
"Fix an ext4 regression which landed during the 6.4 merge window"
* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
Revert "ext4: remove ac->ac_found > sbi->s_mb_min_to_scan dead check in ext4_mb_check_limits"
+15
-1
+15
-1
fs/ext4/mballoc.c
+15
-1
fs/ext4/mballoc.c
···
2062
2062
if (bex->fe_len < gex->fe_len)
2063
2063
return;
2064
2064
2065
-
if (finish_group)
2065
+
if (finish_group || ac->ac_found > sbi->s_mb_min_to_scan)
2066
2066
ext4_mb_use_best_found(ac, e4b);
2067
2067
}
2068
2068
···
2073
2073
* previous found extent and if new one is better, then it's stored
2074
2074
* in the context. Later, the best found extent will be used, if
2075
2075
* mballoc can't find good enough extent.
2076
+
*
2077
+
* The algorithm used is roughly as follows:
2078
+
*
2079
+
* * If free extent found is exactly as big as goal, then
2080
+
* stop the scan and use it immediately
2081
+
*
2082
+
* * If free extent found is smaller than goal, then keep retrying
2083
+
* upto a max of sbi->s_mb_max_to_scan times (default 200). After
2084
+
* that stop scanning and use whatever we have.
2085
+
*
2086
+
* * If free extent found is bigger than goal, then keep retrying
2087
+
* upto a max of sbi->s_mb_min_to_scan times (default 10) before
2088
+
* stopping the scan and using the extent.
2089
+
*
2076
2090
*
2077
2091
* FIXME: real allocation policy is to be designed yet!
2078
2092
*/