ref: 02044e5668850757a17a2ba0a1f41754f96fde7e
parent: 9eaeb41d951cda9fad195a4cf39cc7be37b001b0
author: 9ferno <gophone2015@gmail.com>
date: Sun Jan 15 14:57:50 EST 2023
save extests in text
--- a/extents.c
+++ b/extents.c
@@ -870,6 +870,99 @@
/* string length when the extents are written as a string */
s32
+sizeoftxtextents(Extents *es)
+{+ u64 n, used;
+ s8 tmp[128];
+ Extent *e;
+
+ used = 0;
+ qlock(&es->lck);
+ for(e = lowest(es); e != nil; e = e->high){+ n = snprint(tmp, 128, "%llud %llud %llud\n",
+ e->start, e->start+e->len-1, e->len);
+ if(n == 128)
+ es->panic("sizeofextents(): increase tmp size");+ used += n;
+ }
+ // keep it locked?
+ qunlock(&es->lck);
+ return used;
+}
+/*
+ write to *buf returns the length written.
+ Ensure that nbuf has an extra byte at the end
+ as snprint() alway places a terminating NUL byte.
+ If there is no extra byte, the content gets trimmed.
+ */
+s32
+savetxtextents(Extents *es, s8 *buf, u32 nbuf)
+{+ u64 used;
+ Extent *e;
+ s32 ret;
+
+ used = 0;
+ qlock(&es->lck);
+ for(e = lowest(es); e != nil; e = e->high){+ used += snprint(buf+used, nbuf-used,
+ "%llud %llud %llud\n",
+ e->start, e->start+e->len-1, e->len);
+ if(used >= nbuf){+ es->panic("saveextents(): increase buf size");+ ret = -1; /* increase buf size */
+ goto end;
+ }
+ }
+ ret = used;
+ // keep it locked?
+end:
+ qunlock(&es->lck);
+ return ret;
+}
+
+/* load the extents from buf of length nbuf */
+/* make this be called multiple times to add more extents - not needed now */
+/* assumes that the input is in ascending order of block numbers */
+s32
+loadtxtextents(Extents *es, s8 *buf, u32 nbuf)
+{+ s8 *p, *ep;
+ u64 start, end, nblocks;
+
+ p = buf;
+ if(es->lru != nil || es->n != 0){+ es->panic("extents already loaded.\n"+ " TODO make loadextents() be called multiple times");
+ }
+ while(*p != 0 && p-buf < nbuf){+ start = strtoull(p, &ep, 10);
+ if(p == ep)
+ es->panic("could not read");+
+ p = ep;
+ p += 1; /* skip over the space */
+ end = strtoull(p, &ep, 10);
+ if(p == ep)
+ es->panic("could not read");+
+ p = ep;
+ p += 1; /* skip over the space */
+ nblocks = strtoull(p, &ep, 10);
+ if(p == ep)
+ es->panic("could not read");+ if(end-start+1 != nblocks)
+ es->panic("loadextents does not match up: start %llud end %llud nblocks %llud",+ start, end, nblocks);
+
+ p = ep;
+ p++; /* to skip over the new line */
+ ufree(es, start, nblocks);
+ }
+ return es->n;
+}
+
+s32
sizeofextents(Extents *es)
{/* Do I need a lock? */
@@ -919,6 +1012,8 @@
for(n = nbuf/(3*sizeof(u64)); n>0; n--){start = *p; p++;
end = *p; p++;
+ if(start == 0 && end == 0)
+ panic("loadextents(): nil extent");nunits = *p; p++;
ufree(es, start, nunits);
}
--- a/extents.h
+++ b/extents.h
@@ -95,5 +95,7 @@
void showextentslists(int fd, char *msg, Extents *es);
void showextentspointers(int fd, char *msg, Extents *es);
s32 sizeofextents(Extents *es);
+s32 sizeoftxtextents(Extents *es);
s32 saveextents(Extents *es, s8 *buf, u32 nbuf);
+s32 savetxtextents(Extents *es, s8 *buf, u32 nbuf);
s32 loadextents(Extents *es, s8 *buf, u32 nbuf);