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Grow: accept --assume-clean with --grow --size 

When an array is resized to have larger members, --assume-clean will
disable any resync if the kernel supports it (2.6.40 and later).

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2011-05-16 17:28:27 +10:00
parent ab80e597ba
commit ce52f92f04
4 changed files with 19 additions and 3 deletions
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10
Grow.c
View File

@ -1293,7 +1293,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
long long size,
int level, char *layout_str, int chunksize, int raid_disks,
struct mddev_dev *devlist,
int force)
int assume_clean, int force)
{
/* Make some changes in the shape of an array.
* The kernel must support the change.
@ -1491,6 +1491,14 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
rv = 1;
goto release;
}
if (assume_clean) {
/* This will fail on kernels newer than 2.6.40 unless
* a backport has been arranged.
*/
if (sra == NULL ||
sysfs_set_str(sra, NULL, "resync_start", "none") < 0)
fprintf(stderr, Name ": --assume-clean not support with --grow on this kernel\n");
}
ioctl(fd, GET_ARRAY_INFO, &array);
size = get_component_size(fd)/2;
if (size == 0)

7
mdadm.8.in
View File

@ -702,6 +702,13 @@ with zeros before creation the operator knows the array is
actually clean. If that is the case, such as after running
badblocks, this argument can be used to tell mdadm the
facts the operator knows.
.IP
When an array is resized to a larger size with
.B "\-\-grow \-\-size="
the new space is normally resynced in that same way that the whole
array is resynced at creation. From Linux version 2.6.40,
.B \-\-assume\-clean
can be used with that command to avoid the automatic resync.
.TP
.BR \-\-backup\-file=

3
mdadm.c
View File

@ -542,6 +542,7 @@ int main(int argc, char *argv[])
case O(CREATE,AssumeClean):
case O(BUILD,AssumeClean): /* assume clean */
case O(GROW,AssumeClean):
assume_clean = 1;
continue;
@ -1637,7 +1638,7 @@ int main(int argc, char *argv[])
rv = Grow_reshape(devlist->devname, mdfd, quiet, backup_file,
size, level, layout_str, chunk, raiddisks,
devlist->next,
force);
assume_clean, force);
} else if (array_size < 0)
fprintf(stderr, Name ": no changes to --grow\n");
break;

2
mdadm.h
View File

@ -1013,7 +1013,7 @@ extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
long long size,
int level, char *layout_str, int chunksize, int raid_disks,
struct mddev_dev *devlist,
int force);
int assume_clean, int force);
extern int Grow_restart(struct supertype *st, struct mdinfo *info,
int *fdlist, int cnt, char *backup_file, int verbose);
extern int Grow_continue(int mdfd, struct supertype *st,