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| author | Bob Peterson <rpeterso@redhat.com> | 2020-01-20 15:49:28 +0100 |
|---|---|---|
| committer | Andreas Gruenbacher <agruenba@redhat.com> | 2020-01-28 15:04:53 +0100 |
| commit | a31b4ec539e966515f1f97f4000d0e2a399930ce (patch) | |
| tree | 2dbc373f2a272a5b72f8fd910f9df352f7deebc1 /fs/gfs2/log.c | |
| parent | c04f2e0dd5309607dbc425f02b5ac076b395f19d (diff) | |
| download | linux-a31b4ec539e966515f1f97f4000d0e2a399930ce.tar.bz2 | |
Revert "gfs2: eliminate tr_num_revoke_rm"
This reverts commit e955537e3262de8e56f070b13817f525f472fa00.
Before patch e955537e32, tr_num_revoke tracked the number of revokes
added to the transaction, and tr_num_revoke_rm tracked how many
revokes were removed. But since revokes are queued off the sdp
(superblock) pointer, some transactions could remove more revokes
than they added. (e.g. revokes added by a different process).
Commit e955537e32 eliminated transaction variable tr_num_revoke_rm,
but in order to do so, it changed the accounting to always use
tr_num_revoke for its math. Since you can remove more revokes than
you add, tr_num_revoke could now become a negative value.
This negative value broke the assert in function gfs2_trans_end:
if (gfs2_assert_withdraw(sdp, (nbuf <=3D tr->tr_blocks) &&
(tr->tr_num_revoke <=3D tr->tr_revokes)))
One way to fix this is to simply remove the tr_num_revoke clause
from the assert and allow the value to become negative. Andreas
didn't like that idea, so instead, we decided to revert e955537e32.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Diffstat (limited to 'fs/gfs2/log.c')
| -rw-r--r-- | fs/gfs2/log.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c index ca8fcdb35822..00a2e721a374 100644 --- a/fs/gfs2/log.c +++ b/fs/gfs2/log.c @@ -895,6 +895,7 @@ static void gfs2_merge_trans(struct gfs2_trans *old, struct gfs2_trans *new) old->tr_num_buf_rm += new->tr_num_buf_rm; old->tr_num_databuf_rm += new->tr_num_databuf_rm; old->tr_num_revoke += new->tr_num_revoke; + old->tr_num_revoke_rm += new->tr_num_revoke_rm; list_splice_tail_init(&new->tr_databuf, &old->tr_databuf); list_splice_tail_init(&new->tr_buf, &old->tr_buf); @@ -916,7 +917,7 @@ static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) set_bit(TR_ATTACHED, &tr->tr_flags); } - sdp->sd_log_committed_revoke += tr->tr_num_revoke; + sdp->sd_log_committed_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; reserved = calc_reserved(sdp); maxres = sdp->sd_log_blks_reserved + tr->tr_reserved; gfs2_assert_withdraw(sdp, maxres >= reserved); |