[Cluster-devel] [PATCH 2/2] gfs2: Eliminate redundant ip->i_rgd
Andreas Gruenbacher
agruenba at redhat.com
Wed Jun 20 19:20:57 UTC 2018
GFS2 remembers the last rgrp used for allocations in ip->i_rgd.
However, block allocations are made by way of a reservations structure,
ip->i_res, which keeps the last rgrp in ip->i_res.rs_rgd, and ip->i_res
is kept in sync with ip->i_res.rs_rgd, so it's redundant. Get rid of
ip->i_rgd and just use ip->i_res.rs_rgd in its place.
Based on patches by Robert Peterson.
Signed-off-by: Andreas Gruenbacher <agruenba at redhat.com>
---
fs/gfs2/incore.h | 1 -
fs/gfs2/rgrp.c | 11 +++++------
fs/gfs2/super.c | 1 -
fs/gfs2/trans.h | 6 ++++--
4 files changed, 9 insertions(+), 10 deletions(-)
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index d2ad817e089f..f491577a7de2 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -398,7 +398,6 @@ struct gfs2_inode {
struct gfs2_holder i_gh; /* for prepare/commit_write only */
struct gfs2_qadata *i_qadata; /* quota allocation data */
struct gfs2_blkreserv i_res; /* rgrp multi-block reservation */
- struct gfs2_rgrpd *i_rgd;
u64 i_goal; /* goal block for allocations */
struct rw_semaphore i_rw_mutex;
struct list_head i_ordered;
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index ad7acf552e58..cf34a8d95b01 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1991,8 +1991,8 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, struct gfs2_alloc_parms *ap)
return -EINVAL;
if (gfs2_rs_active(rs)) {
begin = rs->rs_rbm.rgd;
- } else if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, ip->i_goal)) {
- rs->rs_rbm.rgd = begin = ip->i_rgd;
+ } else if (rs->rs_rbm.rgd && rgrp_contains_block(rs->rs_rbm.rgd, ip->i_goal)) {
+ begin = rs->rs_rbm.rgd;
} else {
check_and_update_goal(ip);
rs->rs_rbm.rgd = begin = gfs2_blk2rgrpd(sdp, ip->i_goal, 1);
@@ -2056,8 +2056,7 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, struct gfs2_alloc_parms *ap)
if (rs->rs_rbm.rgd->rd_free_clone >= ap->target ||
(loops == 2 && ap->min_target &&
rs->rs_rbm.rgd->rd_free_clone >= ap->min_target)) {
- ip->i_rgd = rs->rs_rbm.rgd;
- ap->allowed = ip->i_rgd->rd_free_clone;
+ ap->allowed = rs->rs_rbm.rgd->rd_free_clone;
return 0;
}
check_rgrp:
@@ -2335,7 +2334,7 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks,
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct buffer_head *dibh;
- struct gfs2_rbm rbm = { .rgd = ip->i_rgd, };
+ struct gfs2_rbm rbm = { .rgd = ip->i_res.rs_rbm.rgd, };
unsigned int ndata;
u64 block; /* block, within the file system scope */
int error;
@@ -2563,7 +2562,7 @@ void gfs2_rlist_add(struct gfs2_inode *ip, struct gfs2_rgrp_list *rlist,
*/
rgd = rlist->rl_rgrps ? rlist->rl_rgd[rlist->rl_rgrps - 1] :
- ip->i_rgd;
+ ip->i_res.rs_rbm.rgd;
if (rgd && rgrp_contains_block(rgd, block))
return;
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index af0d5b01cf0b..c212893534ed 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -1729,7 +1729,6 @@ static struct inode *gfs2_alloc_inode(struct super_block *sb)
if (ip) {
ip->i_flags = 0;
ip->i_gl = NULL;
- ip->i_rgd = NULL;
memset(&ip->i_res, 0, sizeof(ip->i_res));
RB_CLEAR_NODE(&ip->i_res.rs_node);
ip->i_rahead = 0;
diff --git a/fs/gfs2/trans.h b/fs/gfs2/trans.h
index 1e6e7da25a17..ad70087d0597 100644
--- a/fs/gfs2/trans.h
+++ b/fs/gfs2/trans.h
@@ -30,9 +30,11 @@ struct gfs2_glock;
* block, or all of the blocks in the rg, whichever is smaller */
static inline unsigned int gfs2_rg_blocks(const struct gfs2_inode *ip, unsigned requested)
{
- if (requested < ip->i_rgd->rd_length)
+ struct gfs2_rgrpd *rgd = ip->i_res.rs_rbm.rgd;
+
+ if (requested < rgd->rd_length)
return requested + 1;
- return ip->i_rgd->rd_length;
+ return rgd->rd_length;
}
extern int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
--
2.17.1
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