c/mirror_zfs
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_zfs.git synced 2024-12-26 03:09:34 +03:00
Code Issues Packages Projects Releases Wiki Activity

Fix some signedness issues in arc_evict()

Browse Source 
It may happen that "wanted total ARC size" (wt) is negative, that was
expected.  But multiplication product of it and unsigned fractions
result in unsigned value, incorrectly shifted right with a sing loss.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Prakash Surya <prakash.surya@delphix.com>
Reviewed-by: Paul Dagnelie <pcd@delphix.com>
Signed-off-by:  Alexander Motin <mav@FreeBSD.org>
Sponsored by:   iXsystems, Inc.
Closes #14692
This commit is contained in:
Alexander Motin 2023-04-06 02:42:22 +09:00 committed by GitHub
parent 8eb2f26057
commit 1038f87c4e
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
module/zfs/arc.c
View File

@ -4465,7 +4465,7 @@ arc_evict(void)
*/
int64_t prune = 0;
int64_t dn = wmsum_value(&arc_sums.arcstat_dnode_size);
w = wt * (arc_meta >> 16) >> 16;
w = wt * (int64_t)(arc_meta >> 16) >> 16;
if (zfs_refcount_count(&arc_mru->arcs_size[ARC_BUFC_METADATA]) +
zfs_refcount_count(&arc_mfu->arcs_size[ARC_BUFC_METADATA]) -
zfs_refcount_count(&arc_mru->arcs_esize[ARC_BUFC_METADATA]) -
@ -4481,7 +4481,7 @@ arc_evict(void)
arc_prune_async(prune);
/* Evict MRU metadata. */
w = wt * (arc_meta * arc_pm >> 48) >> 16;
w = wt * (int64_t)(arc_meta * arc_pm >> 48) >> 16;
e = MIN((int64_t)(asize - arc_c), (int64_t)(mrum - w));
bytes = arc_evict_impl(arc_mru, ARC_BUFC_METADATA, e);
total_evicted += bytes;
@ -4489,7 +4489,7 @@ arc_evict(void)
asize -= bytes;
/* Evict MFU metadata. */
w = wt * (arc_meta >> 16) >> 16;
w = wt * (int64_t)(arc_meta >> 16) >> 16;
e = MIN((int64_t)(asize - arc_c), (int64_t)(m - w));
bytes = arc_evict_impl(arc_mfu, ARC_BUFC_METADATA, e);
total_evicted += bytes;
@ -4498,7 +4498,7 @@ arc_evict(void)
/* Evict MRU data. */
wt -= m - total_evicted;
w = wt * (arc_pd >> 16) >> 16;
w = wt * (int64_t)(arc_pd >> 16) >> 16;
e = MIN((int64_t)(asize - arc_c), (int64_t)(mrud - w));
bytes = arc_evict_impl(arc_mru, ARC_BUFC_DATA, e);
total_evicted += bytes;