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authorPeng Tao <tao.peng@emc.com>2012-08-23 12:50:33 -0400
committerSteve Dickson <steved@redhat.com>2012-08-23 13:04:10 -0400
commit42a065968d0f690b5ffd5a7db6afe224206f7b0f (patch)
treedec58ad9024b33e9425deef5765a9bf45bf50762
parentb7a3eb501f8eef61b7767445b2e09b4dca813c82 (diff)
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blkmapd: allow blocklayoutdriver module to load/unload
User may load/unload blocklayoutdriver module dynanmically. So we handle it by watching the pipe file creation/deletion. Signed-off-by: Peng Tao <tao.peng@emc.com> Signed-off-by: Steve Dickson <steved@redhat.com>
-rw-r--r--configure.ac1
-rw-r--r--utils/blkmapd/device-discovery.c104
2 files changed, 85 insertions, 20 deletions
diff --git a/configure.ac b/configure.ac
index 18ee11a..a174bf4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -288,6 +288,7 @@ fi
if test "$enable_nfsv41" = yes; then
AC_CHECK_LIB([devmapper], [dm_task_create], [LIBDEVMAPPER="-ldevmapper"], AC_MSG_ERROR([libdevmapper needed]))
AC_CHECK_HEADER(libdevmapper.h, , AC_MSG_ERROR([Cannot find devmapper header file libdevmapper.h]))
+ AC_CHECK_HEADER(sys/inotify.h, , AC_MSG_ERROR([Cannot find header file sys/inotify.h]))
fi
dnl enable nfsidmap when its support by libnfsidmap
diff --git a/utils/blkmapd/device-discovery.c b/utils/blkmapd/device-discovery.c
index c21de3e..8eddf50 100644
--- a/utils/blkmapd/device-discovery.c
+++ b/utils/blkmapd/device-discovery.c
@@ -31,6 +31,7 @@
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/select.h>
+#include <sys/inotify.h>
#include <linux/kdev_t.h>
#include <scsi/scsi.h>
#include <scsi/scsi_ioctl.h>
@@ -50,10 +51,16 @@
#include "device-discovery.h"
+#define EVENT_SIZE (sizeof(struct inotify_event))
+#define EVENT_BUFSIZE (1024 * EVENT_SIZE)
+
#define BL_PIPE_FILE "/var/lib/nfs/rpc_pipefs/nfs/blocklayout"
+#define NFSPIPE_DIR "/var/lib/nfs/rpc_pipefs/nfs"
+#define RPCPIPE_DIR "/var/lib/nfs/rpc_pipefs"
#define PID_FILE "/var/run/blkmapd.pid"
struct bl_disk *visible_disk_list;
+int bl_watch_fd, bl_pipe_fd, nfs_pipedir_wfd, rpc_pipedir_wfd;
struct bl_disk_path *bl_get_path(const char *filepath,
struct bl_disk_path *paths)
@@ -262,7 +269,7 @@ int bl_discover_devices(void)
* return 1: request processed, and more requests waiting;
* return < 0: error
*/
-int bl_disk_inquiry_process(int fd)
+static int bl_disk_inquiry_process(int fd)
{
int ret = 0;
struct bl_pipemsg_hdr head;
@@ -338,23 +345,70 @@ int bl_disk_inquiry_process(int fd)
return ret;
}
-/* TODO: set bl_process_stop to 1 in command */
-unsigned int bl_process_stop;
+static void bl_watch_dir(const char* dir, int *wd)
+{
+ *wd = inotify_add_watch(bl_watch_fd, dir, IN_CREATE|IN_DELETE);
+ if (*wd < 0)
+ BL_LOG_ERR("failed to watch %s: %s\n", dir, strerror(errno));
+}
-int bl_run_disk_inquiry_process(int fd)
+static void bl_rpcpipe_cb(void)
{
- fd_set rset;
- int ret;
+ int rc, curr_byte = 0;
+ char eventArr[EVENT_BUFSIZE];
+ struct inotify_event *event;
+
+ rc = read(bl_watch_fd, &eventArr, EVENT_BUFSIZE);
+ if (rc < 0)
+ BL_LOG_ERR("read event fail: %s", strerror(errno));
+
+ while (rc > curr_byte) {
+ event = (struct inotify_event *)&eventArr[curr_byte];
+ curr_byte += EVENT_SIZE + event->len;
+ if (event->wd == rpc_pipedir_wfd) {
+ if (strncmp(event->name, "nfs", 3))
+ continue;
+ if (event->mask & IN_CREATE) {
+ BL_LOG_WARNING("nfs pipe dir created\n");
+ bl_watch_dir(NFSPIPE_DIR, &nfs_pipedir_wfd);
+ bl_pipe_fd = open(BL_PIPE_FILE, O_RDWR);
+ } else if (event->mask & IN_DELETE) {
+ BL_LOG_WARNING("nfs pipe dir deleted\n");
+ inotify_rm_watch(bl_watch_fd, nfs_pipedir_wfd);
+ close(bl_pipe_fd);
+ nfs_pipedir_wfd = -1;
+ bl_pipe_fd = -1;
+ }
+ } else if (event->wd == nfs_pipedir_wfd) {
+ if (strncmp(event->name, "blocklayout", 11))
+ continue;
+ if (event->mask & IN_CREATE) {
+ BL_LOG_WARNING("blocklayout pipe file created\n");
+ bl_pipe_fd = open(BL_PIPE_FILE, O_RDWR);
+ if (bl_pipe_fd < 0)
+ BL_LOG_ERR("open %s failed: %s\n",
+ event->name, strerror(errno));
+ } else if (event->mask & IN_DELETE) {
+ BL_LOG_WARNING("blocklayout pipe file deleted\n");
+ close(bl_pipe_fd);
+ bl_pipe_fd = -1;
+ }
+ }
+ }
+}
- bl_process_stop = 0;
+static int bl_event_helper(void)
+{
+ fd_set rset;
+ int ret = 0, maxfd;
for (;;) {
- if (bl_process_stop)
- return 1;
FD_ZERO(&rset);
- FD_SET(fd, &rset);
- ret = 0;
- switch (select(fd + 1, &rset, NULL, NULL, NULL)) {
+ FD_SET(bl_watch_fd, &rset);
+ if (bl_pipe_fd > 0)
+ FD_SET(bl_pipe_fd, &rset);
+ maxfd = (bl_watch_fd>bl_pipe_fd)?bl_watch_fd:bl_pipe_fd;
+ switch (select(maxfd + 1, &rset, NULL, NULL, NULL)) {
case -1:
if (errno == EINTR)
continue;
@@ -365,8 +419,12 @@ int bl_run_disk_inquiry_process(int fd)
case 0:
goto out;
default:
- if (FD_ISSET(fd, &rset))
- ret = bl_disk_inquiry_process(fd);
+ if (FD_ISSET(bl_watch_fd, &rset))
+ bl_rpcpipe_cb();
+ else if (bl_pipe_fd > 0 && FD_ISSET(bl_pipe_fd, &rset))
+ ret = bl_disk_inquiry_process(bl_pipe_fd);
+ if (ret)
+ goto out;
}
}
out:
@@ -376,7 +434,7 @@ int bl_run_disk_inquiry_process(int fd)
/* Daemon */
int main(int argc, char **argv)
{
- int fd, pidfd = -1, opt, dflag = 0, fg = 0, ret = 1;
+ int pidfd = -1, opt, dflag = 0, fg = 0, ret = 1;
struct stat statbuf;
char pidbuf[64];
@@ -426,18 +484,24 @@ int main(int argc, char **argv)
exit(0);
}
- /* open pipe file */
- fd = open(BL_PIPE_FILE, O_RDWR);
- if (fd < 0) {
- BL_LOG_ERR("open pipe file %s error\n", BL_PIPE_FILE);
+ if ((bl_watch_fd = inotify_init()) < 0) {
+ BL_LOG_ERR("init inotify failed %s\n", strerror(errno));
exit(1);
}
+ /* open pipe file */
+ bl_watch_dir(RPCPIPE_DIR, &rpc_pipedir_wfd);
+ bl_watch_dir(NFSPIPE_DIR, &nfs_pipedir_wfd);
+
+ bl_pipe_fd = open(BL_PIPE_FILE, O_RDWR);
+ if (bl_pipe_fd < 0)
+ BL_LOG_ERR("open pipe file %s failed: %s\n", BL_PIPE_FILE, strerror(errno));
+
while (1) {
/* discover device when needed */
bl_discover_devices();
- ret = bl_run_disk_inquiry_process(fd);
+ ret = bl_event_helper();
if (ret < 0) {
/* what should we do with process error? */
BL_LOG_ERR("inquiry process return %d\n", ret);