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Old 07-23-2012, 08:01 AM
Steven Whitehouse
 
Default GFS2: Combine functions get_local_rgrp and gfs2_inplace_reserve

From: Bob Peterson <rpeterso@redhat.com>

This function combines rgrp functions get_local_rgrp and
gfs2_inplace_reserve so that the double retry loop is gone.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 3c6f7ed..e53d0a1 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1207,25 +1207,30 @@ static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip
}

/**
- * get_local_rgrp - Choose and lock a rgrp for allocation
+ * gfs2_inplace_reserve - Reserve space in the filesystem
* @ip: the inode to reserve space for
- * @last_unlinked: the last unlinked block
- *
- * Try to acquire rgrp in way which avoids contending with others.
+ * @requested: the number of blocks to be reserved
*
* Returns: errno
*/

-static int get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
+int gfs2_inplace_reserve(struct gfs2_inode *ip, u32 requested)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_rgrpd *rgd, *begin = NULL;
struct gfs2_blkreserv *rs = ip->i_res;
- int error, rg_locked, flags = LM_FLAG_TRY;
+ int error = 0, rg_locked, flags = LM_FLAG_TRY;
+ u64 last_unlinked = NO_BLOCK;
int loops = 0;

if (sdp->sd_args.ar_rgrplvb)
flags |= GL_SKIP;
+ rs = ip->i_res;
+ rs->rs_requested = requested;
+ if (gfs2_assert_warn(sdp, requested)) {
+ error = -EINVAL;
+ goto out;
+ }

if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, ip->i_goal))
rgd = begin = ip->i_rgd;
@@ -1263,63 +1268,34 @@ static int get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
if (rgd->rd_flags & GFS2_RDF_CHECK) {
if (sdp->sd_args.ar_rgrplvb)
gfs2_rgrp_bh_get(rgd);
- try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
+ try_rgrp_unlink(rgd, &last_unlinked,
+ ip->i_no_addr);
}
if (!rg_locked)
gfs2_glock_dq_uninit(&rs->rs_rgd_gh);
/* fall through */
case GLR_TRYFAILED:
rgd = gfs2_rgrpd_get_next(rgd);
- if (rgd == begin) {
- flags &= ~LM_FLAG_TRY;
- loops++;
- }
+ if (rgd != begin) /* If we didn't wrap */
+ break;
+
+ flags &= ~LM_FLAG_TRY;
+ loops++;
+ /* Check that fs hasn't grown if writing to rindex */
+ if (ip == GFS2_I(sdp->sd_rindex) &&
+ !sdp->sd_rindex_uptodate) {
+ error = gfs2_ri_update(ip);
+ if (error)
+ goto out;
+ } else if (loops == 2)
+ /* Flushing the log may release space */
+ gfs2_log_flush(sdp, NULL);
break;
default:
- return error;
+ goto out;
}
}
-
- return -ENOSPC;
-}
-
-/**
- * gfs2_inplace_reserve - Reserve space in the filesystem
- * @ip: the inode to reserve space for
- * @requested: the number of blocks to be reserved
- *
- * Returns: errno
- */
-
-int gfs2_inplace_reserve(struct gfs2_inode *ip, u32 requested)
-{
- struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
- struct gfs2_blkreserv *rs;
- int error = 0;
- u64 last_unlinked = NO_BLOCK;
- int tries = 0;
-
- rs = ip->i_res;
- rs->rs_requested = requested;
- if (gfs2_assert_warn(sdp, requested)) {
- error = -EINVAL;
- goto out;
- }
-
- do {
- error = get_local_rgrp(ip, &last_unlinked);
- if (error != -ENOSPC)
- break;
- /* Check that fs hasn't grown if writing to rindex */
- if (ip == GFS2_I(sdp->sd_rindex) && !sdp->sd_rindex_uptodate) {
- error = gfs2_ri_update(ip);
- if (error)
- break;
- continue;
- }
- /* Flushing the log may release space */
- gfs2_log_flush(sdp, NULL);
- } while (tries++ < 3);
+ error = -ENOSPC;

out:
if (error)
--
1.7.4
 

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