[PATCH 24/31] mdadm: read chunksize and layout from mdstat

Support reading layout and chunk size from mdstat.
It is needed for external reshape with layout or chunk size changes.

Signed-off-by: Maciej Trela
Signed-off-by: Adam Kwolek
---

mdadm/mdadm/mdadm.h | 1 +
mdadm/mdadm/mdstat.c | 11 +++++++++--
2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/mdadm/mdadm/mdadm.h b/mdadm/mdadm/mdadm.h index cd095fc..68df20b 100644
--- a/mdadm/mdadm/mdadm.h
+++ b/mdadm/mdadm/mdadm.h
@@ -358,6 +358,7 @@ struct mdstat_ent {
int resync; /* 1 if resync, 0 if recovery */
int devcnt;
int raid_disks;
+ int layout;
int chunk_size;
char * metadata_version;
struct dev_member {
diff --git a/mdadm/mdadm/mdstat.c b/mdadm/mdadm/mdstat.c index 47f54cb..aecd1d4 100644
--- a/mdadm/mdadm/mdstat.c
+++ b/mdadm/mdadm/mdstat.c
@@ -146,7 +146,7 @@ struct mdstat_ent *mdstat_read(int hold, int start)
end = &all;
for (; (line = conf_line(f)) ; free_line(line)) {
struct mdstat_ent *ent;
- char *w;
+ char *w, *prev = NULL;
int devnum;
int in_devs = 0;
char *ep;
@@ -192,7 +192,7 @@ struct mdstat_ent *mdstat_read(int hold, int start)
ent->dev = strdup(line);
ent->devnum = devnum;

- for (w=dl_next(line); w!= line ; w=dl_next(w)) {
+ for (w = dl_next(line); w != line ; prev = w, w = dl_next(w)) {
int l = strlen(w);
char *eq;
if (strcmp(w, "active")==0)
@@ -251,6 +251,13 @@ struct mdstat_ent *mdstat_read(int hold, int start)
w[0] <= '9' &&
w[l-1] == '%') {
ent->percent = atoi(w);
+ } else if (strcmp(w, "algorithm") == 0 &&
+ dl_next(w) != line) {
+ w = dl_next(w);
+ ent->layout = atoi(w);
+ } else if (strncmp(w, "chunk", 5) == 0 &&
+ prev != NULL) {
+ ent->chunk_size = atoi(prev) * 1024;
}
}
if (insert_here && (*insert_here)) {

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