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authorBenjamin Marzinski <bmarzins@redhat.com>2010-03-11 03:10:19 +0300
committerSteven Whitehouse <swhiteho@redhat.com>2010-03-11 12:50:46 +0300
commit2e95e3f668c85276ce699993596d3b52b0fcf4c5 (patch)
tree07b4fee61babe92111e1cafb3a30e99b6bdd4934 /fs/gfs2/log.c
parente9edb1d8a345119c9baafa1b240eb1ec06a44662 (diff)
downloadlinux-2e95e3f668c85276ce699993596d3b52b0fcf4c5.tar.xz
GFS2: Allow the number of committed revokes to temporarily be negative
GFS2 tracks the number of revokes and unrevokes that are part of committed transactions via sd_log_commited_revoke. It is possible for one process to add revokes during its transaction, while another process unrevokes them during its transaction. If the second process finishes its transaction first, sd_log_commited_revoke will be decremented by the number of unrevokes that the second process did, without first being incremented by the number of revokes the first process did. This is fine, since all started transactions must be completed before the journal can be flushed. However, sd_log_commited_revoke is an unsigned integer, and log_refund() causes an assertion failure if it would go negative at the end of a transaction. This patch makes sd_log_commited_revoke a signed integer and allows it to go negative. __gfs2_log_flush() still checks that it mataches the actual number of revokes. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/log.c')
-rw-r--r--fs/gfs2/log.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 4511b08fc451..e5bf4b59d46e 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -417,7 +417,7 @@ static unsigned int calc_reserved(struct gfs2_sbd *sdp)
databufhdrs_needed = (sdp->sd_log_commited_databuf +
(dbuf_limit - 1)) / dbuf_limit;
- if (sdp->sd_log_commited_revoke)
+ if (sdp->sd_log_commited_revoke > 0)
revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
sizeof(u64));
@@ -790,7 +790,6 @@ static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) ||
(((int)sdp->sd_log_commited_databuf) >= 0));
sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
- gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0);
reserved = calc_reserved(sdp);
gfs2_assert_withdraw(sdp, sdp->sd_log_blks_reserved + tr->tr_reserved >= reserved);
unused = sdp->sd_log_blks_reserved - reserved + tr->tr_reserved;