put util_create_path() and file creastion in a retry loop

On 8/29/09, Florian Zumbiehl <florz@florz.de> wrote:
> Could it happen that > util_create_path() and util_delete_path()
> do run in parallel for > the same directory? After all, util_create_path()
> does handle > the case where creation of the directory happens in parallel
> to it running, so it doesn't seem all that unlikely to me ...

diff --git a/libudev/libudev-queue-private.c b/libudev/libudev-queue-private.c
index d9f7a67d18c7eac3b1478d1be6d876f6d0fbfdf5..4e67a1f9d05ae2503ab43b5860c92fcd4c2e7ab7 100644 (file)
--- a/libudev/libudev-queue-private.c
+++ b/libudev/libudev-queue-private.c
@@ -45,9 +45,9 @@
 #include <fcntl.h>
 #include <dirent.h>
 #include <limits.h>
+#include <errno.h>
 #include <sys/stat.h>
 #include <sys/types.h>
-#include <assert.h>
 
 #include "libudev.h"
 #include "libudev-private.h"
@@ -396,6 +396,7 @@ static void update_failed(struct udev_queue_export *udev_queue_export,
 {
        struct udev *udev = udev_device_get_udev(udev_device);
        char filename[UTIL_PATH_SIZE];
+       int err;
 
        if (state != DEVICE_FAILED && udev_queue_export->failed_count == 0)
                return;
@@ -408,10 +409,14 @@ static void update_failed(struct udev_queue_export *udev_queue_export,
        case DEVICE_FAILED:
                /* record event in the failed directory */
                udev_queue_export->failed_count++;
-               util_create_path(udev, filename);
-               udev_selinux_setfscreatecon(udev, filename, S_IFLNK);
-               symlink(udev_device_get_devpath(udev_device), filename);
-               udev_selinux_resetfscreatecon(udev);
+               do {
+                       util_create_path(udev, filename);
+                       udev_selinux_setfscreatecon(udev, filename, S_IFLNK);
+                       err = symlink(udev_device_get_devpath(udev_device), filename);
+                       if (err != 0)
+                               err = errno;
+                       udev_selinux_resetfscreatecon(udev);
+               } while (err == ENOENT);
                break;
 
        case DEVICE_QUEUED:

diff --git a/udev/udev-node.c b/udev/udev-node.c
index 3685485eb1066a113226733e366aa5eeb0160f3c..39bec3e166ba9cc5f9be49324df28b36c9396ec8 100644 (file)
--- a/udev/udev-node.c
+++ b/udev/udev-node.c
@@ -77,10 +77,14 @@ int udev_node_mknod(struct udev_device *dev, const char *file, dev_t devnum, mod
                }
        } else {
                info(udev, "mknod(%s, %#o, (%u,%u))\n", file, mode, major(devnum), minor(devnum));
-               util_create_path(udev, file);
-               udev_selinux_setfscreatecon(udev, file, mode);
-               err = mknod(file, mode, devnum);
-               udev_selinux_resetfscreatecon(udev);
+               do {
+                       util_create_path(udev, file);
+                       udev_selinux_setfscreatecon(udev, file, mode);
+                       err = mknod(file, mode, devnum);
+                       if (err != 0)
+                               err = errno;
+                       udev_selinux_resetfscreatecon(udev);
+               } while (err == ENOENT);
                if (err != 0) {
                        err(udev, "mknod(%s, %#o, (%u,%u) failed: %m\n", file, mode, major(devnum), minor(devnum));
                        goto exit;
@@ -175,10 +179,14 @@ static int node_symlink(struct udev *udev, const char *node, const char *slink)
                }
        } else {
                info(udev, "creating symlink '%s' to '%s'\n", slink, target);
-               util_create_path(udev, slink);
-               udev_selinux_setfscreatecon(udev, slink, S_IFLNK);
-               err = symlink(target, slink);
-               udev_selinux_resetfscreatecon(udev);
+               do {
+                       util_create_path(udev, slink);
+                       udev_selinux_setfscreatecon(udev, slink, S_IFLNK);
+                       err = symlink(target, slink);
+                       if (err != 0)
+                               err = errno;
+                       udev_selinux_resetfscreatecon(udev);
+               } while (err == ENOENT);
                if (err == 0)
                        goto exit;
        }
@@ -186,10 +194,14 @@ static int node_symlink(struct udev *udev, const char *node, const char *slink)
        info(udev, "atomically replace '%s'\n", slink);
        util_strscpyl(slink_tmp, sizeof(slink_tmp), slink, TMP_FILE_EXT, NULL);
        unlink(slink_tmp);
-       util_create_path(udev, slink);
-       udev_selinux_setfscreatecon(udev, slink, S_IFLNK);
-       err = symlink(target, slink_tmp);
-       udev_selinux_resetfscreatecon(udev);
+       do {
+               util_create_path(udev, slink);
+               udev_selinux_setfscreatecon(udev, slink, S_IFLNK);
+               err = symlink(target, slink_tmp);
+               if (err != 0)
+                       err = errno;
+               udev_selinux_resetfscreatecon(udev);
+       } while (err == ENOENT);
        if (err != 0) {
                err(udev, "symlink(%s, %s) failed: %m\n", target, slink_tmp);
                goto exit;
@@ -302,8 +314,10 @@ static void link_update(struct udev_device *dev, const char *slink, bool add)
 
        if (add) {
                dbg(udev, "creating index: '%s'\n", filename);
-               util_create_path(udev, filename);
-               symlink(udev_device_get_devpath(dev), filename);
+               do {
+                       util_create_path(udev, filename);
+                       symlink(udev_device_get_devpath(dev), filename);
+               } while (errno == ENOENT);
        }
 }