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Make sure child_monitor reliably reports whether reshape completed or aborted. 

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2011-01-17 09:51:25 +11:00
parent 631d7405f1
commit 77a73a17be
1 changed files with 19 additions and 5 deletions
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24
Grow.c
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@ -2216,6 +2216,7 @@ int progress_reshape(struct mdinfo *info, struct reshape *reshape,
unsigned long long array_size = (info->component_size
* reshape->before.data_disks);
int fd;
char buf[20];
/* First, we unsuspend any region that is now known to be safe.
* If suspend_point is on the 'wrong' side of reshape_progress, then
@ -2366,11 +2367,11 @@ int progress_reshape(struct mdinfo *info, struct reshape *reshape,
*/
fd = sysfs_get_fd(info, NULL, "sync_completed");
if (fd < 0)
return -1;
goto check_progress;
if (sysfs_fd_get_ll(fd, &completed) < 0) {
close(fd);
return -1;
goto check_progress;
}
while (completed < max_progress && completed < wait_point) {
/* Check that sync_action is still 'reshape' to avoid
@ -2387,7 +2388,7 @@ int progress_reshape(struct mdinfo *info, struct reshape *reshape,
select(fd+1, NULL, NULL, &rfds, NULL);
if (sysfs_fd_get_ll(fd, &completed) < 0) {
close(fd);
return -1;
goto check_progress;
}
}
/* some kernels can give an incorrectly high 'completed' number */
@ -2409,6 +2410,18 @@ int progress_reshape(struct mdinfo *info, struct reshape *reshape,
return advancing
? (need_backup > info->reshape_progress)
: (need_backup < info->reshape_progress);
check_progress:
/* if we couldn't read a number from sync_completed, then
* either the reshape did complete, or it aborted.
* We can tell which by checking for 'none' in reshape_position.
*/
strcpy(buf, "hi");
if (sysfs_get_str(info, NULL, "reshape_position", buf, sizeof(buf)) < 0
|| strncmp(buf, "none", 4) != 0)
return -2; /* abort */
else
return -1; /* complete */
}
@ -2785,7 +2798,8 @@ int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape,
}
if (rv < 0) {
done = 1;
if (rv == -1)
done = 1;
break;
}
@ -2840,7 +2854,7 @@ int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape,
if (reshape->before.data_disks == reshape->after.data_disks)
sysfs_set_num(sra, NULL, "sync_speed_min", speed);
free(buf);
return 1; /* FIXME what does this mean? */
return done;
}
/*