Allow passing metadata update to the monitor.
Code in manager can now just call queue_metadata_update with a (freeable) buf holding the update, and it will get passed to the monitor and written out.
This commit is contained in:
parent
b228067720
commit
2e735d1982
41
managemon.c
41
managemon.c
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@ -151,6 +151,45 @@ static void replace_array(struct supertype *container,
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write_wakeup(container);
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}
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struct metadata_update *update_queue = NULL;
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struct metadata_update *update_queue_handled = NULL;
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struct metadata_update *update_queue_pending = NULL;
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void check_update_queue(struct supertype *container)
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{
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while (update_queue_handled) {
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struct metadata_update *this = update_queue_handled;
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update_queue_handled = this->next;
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free(this->buf);
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free(this);
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}
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if (update_queue == NULL &&
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update_queue_pending) {
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update_queue = update_queue_pending;
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update_queue_pending = NULL;
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write_wakeup(container);
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}
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}
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void queue_metadata_update(struct metadata_update *mu)
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{
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struct metadata_update **qp;
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qp = &update_queue_pending;
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while (*qp)
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qp = & ((*qp)->next);
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*qp = mu;
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}
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void wait_update_handled(void)
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{
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/* Wait for any pending update to be handled by monitor.
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* i.e. wait until update_queue is NULL
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*/
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while (update_queue)
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usleep(100 * 1000);
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}
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static void manage_container(struct mdstat_ent *mdstat,
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struct supertype *container)
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{
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@ -404,6 +443,8 @@ void do_manager(struct supertype *container)
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remove_old();
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check_update_queue(container);
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manager_ready = 1;
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sigprocmask(SIG_SETMASK, &block, &orig);
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if (woke == 0)
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5
mdadm.h
5
mdadm.h
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@ -372,6 +372,7 @@ extern mapping_t r5layout[], pers[], modes[], faultylayout[];
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extern char *map_dev(int major, int minor, int create);
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struct active_array;
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struct metadata_update;
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extern struct superswitch {
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void (*examine_super)(struct supertype *st, char *homehost);
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@ -433,7 +434,9 @@ extern struct superswitch {
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* not in fact changed.
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*/
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void (*set_disk)(struct active_array *a, int n, int state);
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void (*sync_metadata)(struct active_array *a);
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void (*sync_metadata)(struct supertype *st);
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void (*process_update)(struct supertype *st,
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struct metadata_update *update);
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int major;
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19
mdmon.h
19
mdmon.h
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@ -21,7 +21,24 @@ struct active_array {
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unsigned long long resync_start;
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};
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/*
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* Metadata updates are handled by the monitor thread,
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* as it has exclusive access to the metadata.
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* When the manager want to updates metadata, either
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* for it's own reason (e.g. committing a spare) or
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* on behalf of mdadm, it creates a metadata_update
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* structure and queues it to the monitor.
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* Updates are created and processed by code under the
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* superswitch. All common code sees them as opaque
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* blobs.
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*/
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struct metadata_update {
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int len;
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char *buf;
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void *space; /* allocated space that monitor will use */
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struct metadata_update *next;
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};
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extern struct metadata_update *update_queue, *update_queue_handled;
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#define MD_MAJOR 9
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14
monitor.c
14
monitor.c
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@ -299,7 +299,7 @@ static int read_and_act(struct active_array *a)
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// FIXME;
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}
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a->container->ss->sync_metadata(a);
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a->container->ss->sync_metadata(a->container);
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/* Effect state changes in the array */
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if (a->next_state != bad_word)
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@ -492,6 +492,18 @@ static int wait_and_act(struct supertype *container, int pfd,
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}
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}
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if (update_queue) {
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struct metadata_update *this;
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for (this = update_queue; this ; this = this->next)
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container->ss->process_update(container, this);
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update_queue_handled = update_queue;
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update_queue = NULL;
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signal_manager();
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container->ss->sync_metadata(container);
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}
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for (a = *aap; a ; a = a->next) {
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if (a->replaces && !discard_this) {
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struct active_array **ap;
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@ -2666,7 +2666,7 @@ static void ddf_set_disk(struct active_array *a, int n, int state)
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fprintf(stderr, "ddf: set_disk %d\n", n);
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}
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static void ddf_sync_metadata(struct active_array *a)
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static void ddf_sync_metadata(struct supertype *st)
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{
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/*
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@ -2676,7 +2676,7 @@ static void ddf_sync_metadata(struct active_array *a)
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* but ddf is sufficiently weird that it probably always
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* changes global data ....
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*/
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__write_init_super_ddf(a->container, 0);
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__write_init_super_ddf(st, 0);
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fprintf(stderr, "ddf: sync_metadata\n");
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}
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@ -1307,9 +1307,9 @@ static int store_imsm_mpb(int fd, struct intel_super *super)
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return 0;
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}
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static void imsm_sync_metadata(struct active_array *a)
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static void imsm_sync_metadata(struct supertype *container)
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{
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struct intel_super *super = a->container->sb;
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struct intel_super *super = container->sb;
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struct imsm_super *mpb = super->mpb;
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struct dl *d;
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__u32 generation;
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