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-rw-r--r--fs/gfs2/incore.h2
-rw-r--r--fs/gfs2/mount.c10
-rw-r--r--fs/gfs2/ops_super.c2
-rw-r--r--fs/gfs2/rgrp.c55
4 files changed, 68 insertions, 1 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 8fe0675120a..3f29bd224ba 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -416,7 +416,7 @@ struct gfs2_args {
unsigned int ar_suiddir:1; /* suiddir support */
unsigned int ar_data:2; /* ordered/writeback */
unsigned int ar_meta:1; /* mount metafs */
- unsigned int ar_num_glockd; /* Number of glockd threads */
+ unsigned int ar_discard:1; /* discard requests */
};
struct gfs2_tune {
diff --git a/fs/gfs2/mount.c b/fs/gfs2/mount.c
index fba502aa8b2..ee69701a777 100644
--- a/fs/gfs2/mount.c
+++ b/fs/gfs2/mount.c
@@ -41,6 +41,8 @@ enum {
Opt_data_writeback,
Opt_data_ordered,
Opt_meta,
+ Opt_discard,
+ Opt_nodiscard,
Opt_err,
};
@@ -65,6 +67,8 @@ static const match_table_t tokens = {
{Opt_data_writeback, "data=writeback"},
{Opt_data_ordered, "data=ordered"},
{Opt_meta, "meta"},
+ {Opt_discard, "discard"},
+ {Opt_nodiscard, "nodiscard"},
{Opt_err, NULL}
};
@@ -157,6 +161,12 @@ int gfs2_mount_args(struct gfs2_sbd *sdp, struct gfs2_args *args, char *options)
case Opt_meta:
args->ar_meta = 1;
break;
+ case Opt_discard:
+ args->ar_discard = 1;
+ break;
+ case Opt_nodiscard:
+ args->ar_discard = 0;
+ break;
case Opt_err:
default:
fs_info(sdp, "invalid mount option: %s\n", o);
diff --git a/fs/gfs2/ops_super.c b/fs/gfs2/ops_super.c
index 4ecdad026ea..458019569dc 100644
--- a/fs/gfs2/ops_super.c
+++ b/fs/gfs2/ops_super.c
@@ -608,6 +608,8 @@ static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
}
seq_printf(s, ",data=%s", state);
}
+ if (args->ar_discard)
+ seq_printf(s, ",discard");
return 0;
}
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index ba5a021b1c5..789953a2b6a 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -14,6 +14,7 @@
#include <linux/fs.h>
#include <linux/gfs2_ondisk.h>
#include <linux/prefetch.h>
+#include <linux/blkdev.h>
#include "gfs2.h"
#include "incore.h"
@@ -830,6 +831,58 @@ void gfs2_rgrp_bh_put(struct gfs2_rgrpd *rgd)
spin_unlock(&sdp->sd_rindex_spin);
}
+static void gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
+ const struct gfs2_bitmap *bi)
+{
+ struct super_block *sb = sdp->sd_vfs;
+ struct block_device *bdev = sb->s_bdev;
+ const unsigned int sects_per_blk = sdp->sd_sb.sb_bsize /
+ bdev_hardsect_size(sb->s_bdev);
+ u64 blk;
+ sector_t start;
+ sector_t nr_sects = 0;
+ int rv;
+ unsigned int x;
+
+ for (x = 0; x < bi->bi_len; x++) {
+ const u8 *orig = bi->bi_bh->b_data + bi->bi_offset + x;
+ const u8 *clone = bi->bi_clone + bi->bi_offset + x;
+ u8 diff = ~(*orig | (*orig >> 1)) & (*clone | (*clone >> 1));
+ diff &= 0x55;
+ if (diff == 0)
+ continue;
+ blk = offset + ((bi->bi_start + x) * GFS2_NBBY);
+ blk *= sects_per_blk; /* convert to sectors */
+ while(diff) {
+ if (diff & 1) {
+ if (nr_sects == 0)
+ goto start_new_extent;
+ if ((start + nr_sects) != blk) {
+ rv = blkdev_issue_discard(bdev, start,
+ nr_sects, GFP_NOFS);
+ if (rv)
+ goto fail;
+ nr_sects = 0;
+start_new_extent:
+ start = blk;
+ }
+ nr_sects += sects_per_blk;
+ }
+ diff >>= 2;
+ blk += sects_per_blk;
+ }
+ }
+ if (nr_sects) {
+ rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS);
+ if (rv)
+ goto fail;
+ }
+ return;
+fail:
+ fs_warn(sdp, "error %d on discard request, turning discards off for this filesystem", rv);
+ sdp->sd_args.ar_discard = 0;
+}
+
void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd)
{
struct gfs2_sbd *sdp = rgd->rd_sbd;
@@ -840,6 +893,8 @@ void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd)
struct gfs2_bitmap *bi = rgd->rd_bits + x;
if (!bi->bi_clone)
continue;
+ if (sdp->sd_args.ar_discard)
+ gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bi);
memcpy(bi->bi_clone + bi->bi_offset,
bi->bi_bh->b_data + bi->bi_offset, bi->bi_len);
}