diff options
Diffstat (limited to 'sysfs.c')
| -rw-r--r-- | sysfs.c | 33 |
1 files changed, 33 insertions, 0 deletions
@@ -435,6 +435,17 @@ int sysfs_uevent(struct mdinfo *sra, char *event) return 0; } +int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name) +{ + char fname[50]; + struct stat st; + + sprintf(fname, "/sys/block/%s/md/%s/%s", + sra->sys_name, dev?dev->sys_name:"", name); + + return stat(fname, &st) == 0; +} + int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev, char *name) { @@ -789,6 +800,28 @@ int sysfs_unique_holder(int devnum, long rdev) return found; } +int sysfs_freeze_array(struct mdinfo *sra) +{ + /* Try to freeze resync/rebuild on this array/container. + * Return -1 if the array is busy, + * return -2 container cannot be frozen, + * return 0 if this kernel doesn't support 'frozen' + * return 1 if it worked. + */ + char buf[20]; + + if (!sysfs_attribute_available(sra, NULL, "sync_action")) + return 1; /* no sync_action == frozen */ + if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0) + return 0; + if (strcmp(buf, "idle\n") != 0 && + strcmp(buf, "frozen\n") != 0) + return -1; + if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0) + return 0; + return 1; +} + #ifndef MDASSEMBLE static char *clean_states[] = { |