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gfs2: eliminate rs_inum and reduce the size of gfs2 inodes 

Before this patch, block reservations kept track of the inode
number. At one point, that was a valid thing to do. However, since
we made the reservation a part of the inode (rather than a pointer
to a separate allocated object) the reservation can determine the
inode number by using container_of. This saves us a little memory
in our inode.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
Reviewed-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Bob Peterson 2018-06-13 08:52:47 -05:00
parent f0dc7f9c6d
commit f85c10e24a
3 changed files with 5 additions and 4 deletions
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1
fs/gfs2/incore.h
View File

@ -295,7 +295,6 @@ struct gfs2_blkreserv {
struct rb_node rs_node; /* link to other block reservations */
struct gfs2_rbm rs_rbm; /* Start of reservation */
u32 rs_free; /* how many blocks are still free */
u64 rs_inum; /* Inode number for reservation */
};
/*

5
fs/gfs2/rgrp.c
View File

@ -607,8 +607,10 @@ int gfs2_rsqa_alloc(struct gfs2_inode *ip)
static void dump_rs(struct seq_file *seq, const struct gfs2_blkreserv *rs)
{
struct gfs2_inode *ip = container_of(rs, struct gfs2_inode, i_res);
gfs2_print_dbg(seq, " B: n:%llu s:%llu b:%u f:%u\n",
(unsigned long long)rs->rs_inum,
(unsigned long long)ip->i_no_addr,
(unsigned long long)gfs2_rbm_to_block(&rs->rs_rbm),
rs->rs_rbm.offset, rs->rs_free);
}
@ -1528,7 +1530,6 @@ static void rg_mblk_search(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip,
if (ret == 0) {
rs->rs_rbm = rbm;
rs->rs_free = extlen;
rs->rs_inum = ip->i_no_addr;
rs_insert(ip);
} else {
if (goal == rgd->rd_last_alloc + rgd->rd_data0)

3
fs/gfs2/trace_gfs2.h
View File

@ -606,7 +606,8 @@ TRACE_EVENT(gfs2_rs,
__entry->rd_addr = rs->rs_rbm.rgd->rd_addr;
__entry->rd_free_clone = rs->rs_rbm.rgd->rd_free_clone;
__entry->rd_reserved = rs->rs_rbm.rgd->rd_reserved;
__entry->inum = rs->rs_inum;
__entry->inum = container_of(rs, struct gfs2_inode,
i_res)->i_no_addr;
__entry->start = gfs2_rbm_to_block(&rs->rs_rbm);
__entry->free = rs->rs_free;
__entry->func = func;