This patch doesn't attempt to solve any bugs. I just wanted to get more
useful information about snapshots from /proc -- little things like the
snapshots' actual size, what volume is its source, and how much of its space
it has used. Yes, all this information is available from /sbin/lvdisplay
(except for the *real* allocated LE, which you have to figure by hand). But
I like using /proc.
I put the extra (conditional) lines before the "device:" line because the
optional stripesize line was already there.
I'd like to fit the snapshot/snapshot-source bit into the status bits in
/proc/lvm/global too, but I haven't done it yet.
Dale J. Stephenson
steph@snapserver.com
--- linux/drivers/md/lvm-fs.c.orig Mon Apr 22 12:14:59 2002
+++ linux/drivers/md/lvm-fs.c Mon Apr 22 13:44:03 2002
@@ -285,6 +285,26 @@
sz += sprintf(page + sz, "stripesize: %u\n",
lv->lv_stripesize);
}
+ if (lv->lv_access & LV_SNAPSHOT) {
+ sz += sprintf(page + sz, "remap total: %u\n",
+ lv->lv_remap_end * lv->lv_chunk_size / 2);
+ sz += sprintf(page + sz, "remap used: %u\n",
+ lv->lv_remap_ptr * lv->lv_chunk_size / 2);
+ sz += sprintf(page + sz, "snapshot LE: %u\n",
+ lv->lv_allocated_snapshot_le);
+ if (lv->lv_snapshot_org != NULL) {
+ sz += sprintf(page + sz, "source: %s\n",
+ lv->lv_snapshot_org->lv_name);
+ }
+ }
+ if (lv->lv_access & LV_SNAPSHOT_ORG) {
+ lv_t *lvp = lv->lv_snapshot_next;
+ while (lvp != NULL) {
+ sz += sprintf(page + sz, "source of: %s\n",
+ lvp->lv_name);
+ lvp = lvp->lv_snapshot_next;
+ }
+ }
sz += sprintf(page + sz, "device: %02u:%02u\n",
MAJOR(lv->lv_dev), MINOR(lv->lv_dev));
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