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GFS2: Use cached rgrp in gfs2_rlist_add()

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Each block which is deallocated, requires a call to gfs2_rlist_add()
and each of those calls was calling gfs2_blk2rgrpd() in order to
figure out which rgrp the block belonged in. This can be speeded up
by making use of the rgrp cached in the inode. We also reset this
cached rgrp in case the block has changed rgrp. This should provide
a big reduction in gfs2_blk2rgrpd() calls during deallocation.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse
2011-09-02 16:08:09 +01:00
parent d56fa8a1c1
commit 70b0c3656f
5 changed files with 15 additions and 11 deletions
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14
fs/gfs2/rgrp.c
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@@ -1560,7 +1560,7 @@ fail:
/**
* gfs2_rlist_add - add a RG to a list of RGs
* @sdp: the filesystem
* @ip: the inode
* @rlist: the list of resource groups
* @block: the block
*
@@ -1570,9 +1570,10 @@ fail:
*
*/
void gfs2_rlist_add(struct gfs2_sbd *sdp, struct gfs2_rgrp_list *rlist,
void gfs2_rlist_add(struct gfs2_inode *ip, struct gfs2_rgrp_list *rlist,
u64 block)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_rgrpd *rgd;
struct gfs2_rgrpd **tmp;
unsigned int new_space;
@@ -1581,12 +1582,15 @@ void gfs2_rlist_add(struct gfs2_sbd *sdp, struct gfs2_rgrp_list *rlist,
if (gfs2_assert_warn(sdp, !rlist->rl_ghs))
return;
rgd = gfs2_blk2rgrpd(sdp, block);
if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, block))
rgd = ip->i_rgd;
else
rgd = gfs2_blk2rgrpd(sdp, block);
if (!rgd) {
if (gfs2_consist(sdp))
fs_err(sdp, "block = %llu\n", (unsigned long long)block);
fs_err(sdp, "rlist_add: no rgrp for block %llu\n", (unsigned long long)block);
return;
}
ip->i_rgd = rgd;
for (x = 0; x < rlist->rl_rgrps; x++)
if (rlist->rl_rgd[x] == rgd)