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authorSteven Whitehouse <swhiteho@redhat.com>2014-02-21 21:55:33 +0000
committerSteven Whitehouse <swhiteho@redhat.com>2014-02-24 19:49:12 +0000
commit022ef4feed0c648aeb72d0c8ad06d266de08f525 (patch)
tree03fd8c0fe847338bcf2772a469c9eaa1853d8a9d /fs/gfs2/log.c
parentd69a3c6561362a53d1be908ca343d899161d602c (diff)
downloadlinux-022ef4feed0c648aeb72d0c8ad06d266de08f525.tar.bz2
GFS2: Move log buffer accounting to transaction
Now we have a master transaction into which other transactions are merged, the accounting can be done using this master transaction. We no longer require the superblock fields which were being used for this function. In addition, this allows for a clean up in calc_reserved() making it rather easier understand. Also, by reducing the number of variables used to track the buffers being added and removed from the journal, a number of error checks are now no longer required. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/log.c')
-rw-r--r--fs/gfs2/log.c67
1 files changed, 24 insertions, 43 deletions
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 975712c6660b..c1c9a29fda9c 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -414,24 +414,22 @@ static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer
static unsigned int calc_reserved(struct gfs2_sbd *sdp)
{
unsigned int reserved = 0;
- unsigned int mbuf_limit, metabufhdrs_needed;
- unsigned int dbuf_limit, databufhdrs_needed;
- unsigned int revokes = 0;
+ unsigned int mbuf;
+ unsigned int dbuf;
+ struct gfs2_trans *tr = sdp->sd_log_tr;
- mbuf_limit = buf_limit(sdp);
- metabufhdrs_needed = (sdp->sd_log_commited_buf +
- (mbuf_limit - 1)) / mbuf_limit;
- dbuf_limit = databuf_limit(sdp);
- databufhdrs_needed = (sdp->sd_log_commited_databuf +
- (dbuf_limit - 1)) / dbuf_limit;
+ if (tr) {
+ mbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
+ dbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
+ reserved = mbuf + dbuf;
+ /* Account for header blocks */
+ reserved += DIV_ROUND_UP(mbuf, buf_limit(sdp));
+ reserved += DIV_ROUND_UP(dbuf, databuf_limit(sdp));
+ }
if (sdp->sd_log_commited_revoke > 0)
- revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
+ reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
sizeof(u64));
-
- reserved = sdp->sd_log_commited_buf + metabufhdrs_needed +
- sdp->sd_log_commited_databuf + databufhdrs_needed +
- revokes;
/* One for the overall header */
if (reserved)
reserved++;
@@ -693,16 +691,6 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
INIT_LIST_HEAD(&tr->tr_ail2_list);
}
- if (sdp->sd_log_num_buf != sdp->sd_log_commited_buf) {
- printk(KERN_INFO "GFS2: log buf %u %u\n", sdp->sd_log_num_buf,
- sdp->sd_log_commited_buf);
- gfs2_assert_withdraw(sdp, 0);
- }
- if (sdp->sd_log_num_databuf != sdp->sd_log_commited_databuf) {
- printk(KERN_INFO "GFS2: log databuf %u %u\n",
- sdp->sd_log_num_databuf, sdp->sd_log_commited_databuf);
- gfs2_assert_withdraw(sdp, 0);
- }
gfs2_assert_withdraw(sdp,
sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);
@@ -727,8 +715,6 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
gfs2_log_lock(sdp);
sdp->sd_log_head = sdp->sd_log_flush_head;
sdp->sd_log_blks_reserved = 0;
- sdp->sd_log_commited_buf = 0;
- sdp->sd_log_commited_databuf = 0;
sdp->sd_log_commited_revoke = 0;
spin_lock(&sdp->sd_ail_lock);
@@ -769,31 +755,29 @@ static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
{
unsigned int reserved;
unsigned int unused;
+ unsigned int maxres;
gfs2_log_lock(sdp);
- sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm;
- sdp->sd_log_commited_databuf += tr->tr_num_databuf_new -
- tr->tr_num_databuf_rm;
- gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) ||
- (((int)sdp->sd_log_commited_databuf) >= 0));
+ if (sdp->sd_log_tr) {
+ gfs2_merge_trans(sdp->sd_log_tr, tr);
+ } else if (tr->tr_num_buf_new || tr->tr_num_databuf_new) {
+ gfs2_assert_withdraw(sdp, tr->tr_t_gh.gh_gl);
+ sdp->sd_log_tr = tr;
+ tr->tr_attached = 1;
+ }
+
sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
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;
+ maxres = sdp->sd_log_blks_reserved + tr->tr_reserved;
+ gfs2_assert_withdraw(sdp, maxres >= reserved);
+ unused = maxres - reserved;
atomic_add(unused, &sdp->sd_log_blks_free);
trace_gfs2_log_blocks(sdp, unused);
gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
sdp->sd_jdesc->jd_blocks);
sdp->sd_log_blks_reserved = reserved;
- if (sdp->sd_log_tr) {
- gfs2_merge_trans(sdp->sd_log_tr, tr);
- } else if (tr->tr_num_buf_new || tr->tr_num_databuf_new) {
- gfs2_assert_withdraw(sdp, tr->tr_t_gh.gh_gl);
- sdp->sd_log_tr = tr;
- tr->tr_attached = 1;
- }
gfs2_log_unlock(sdp);
}
@@ -833,10 +817,7 @@ void gfs2_log_shutdown(struct gfs2_sbd *sdp)
down_write(&sdp->sd_log_flush_lock);
gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
- gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
- gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
- gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf);
gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
sdp->sd_log_flush_head = sdp->sd_log_head;