diff options
| -rw-r--r-- | Manage.c | 38 |
1 files changed, 36 insertions, 2 deletions
@@ -207,10 +207,26 @@ int Manage_runstop(char *devname, int fd, int runstop, int quiet) struct stat stb; struct mdinfo *mdi; int devnum; + int err; + int count; /* If this is an mdmon managed array, just write 'inactive' * to the array state and let mdmon clear up. */ devnum = fd2devnum(fd); + /* Get EXCL access first. If this fails, then attempting + * to stop is probably a bad idea. + */ + close(fd); + fd = open(devname, O_RDONLY|O_EXCL); + if (fd < 0 || fd2devnum(fd) != devnum) { + if (fd >= 0) + close(fd); + fprintf(stderr, + Name ": Cannot get exclusive access to %s:" + " possibly it is still in use.\n", + devname); + return 1; + } mdi = sysfs_read(fd, -1, GET_LEVEL|GET_VERSION); if (mdi && mdi->array.level > 0 && @@ -229,7 +245,14 @@ int Manage_runstop(char *devname, int fd, int runstop, int quiet) /* Give monitor a chance to act */ ping_monitor(mdi->text_version); - fd = open(devname, O_RDONLY); + fd = open_dev_excl(devnum); + if (fd < 0) { + fprintf(stderr, Name + ": failed to completely stop %s" + ": Device is busy\n", + devname); + return 1; + } } else if (mdi && mdi->array.major_version == -1 && mdi->array.minor_version == -2 && @@ -262,7 +285,18 @@ int Manage_runstop(char *devname, int fd, int runstop, int quiet) } } - if (fd >= 0 && ioctl(fd, STOP_ARRAY, NULL)) { + /* As we have an O_EXCL open, any use of the device + * which blocks STOP_ARRAY is probably a transient use, + * so it is reasonable to retry for a while - 5 seconds. + */ + count = 25; err = 0; + while (count && fd >= 0 + && (err = ioctl(fd, STOP_ARRAY, NULL)) < 0 + && errno == EBUSY) { + usleep(200000); + count --; + } + if (fd >= 0 && err) { if (quiet == 0) { fprintf(stderr, Name ": failed to stop array %s: %s\n", |