1 files changed, 177 insertions, 83 deletions

diff --git a/drivers/scsi/osd/osd_uld.c b/drivers/scsi/osd/osd_uld.c
index 0bdef3390902..0a90702b3d71 100644
--- a/drivers/scsi/osd/osd_uld.c
+++ b/drivers/scsi/osd/osd_uld.c
@@ -71,8 +71,7 @@
 #define SCSI_OSD_MAX_MINOR 64
 
 static const char osd_name[] = "osd";
-static const char *osd_version_string = "open-osd 0.1.0";
-const char osd_symlink[] = "scsi_osd";
+static const char *osd_version_string = "open-osd 0.2.0";
 
 MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
 MODULE_DESCRIPTION("open-osd Upper-Layer-Driver osd.ko");
@@ -82,15 +81,25 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_OSD);
 
 struct osd_uld_device {
         int minor;
-        struct kref kref;
+        struct device class_dev;
         struct cdev cdev;
         struct osd_dev od;
+        struct osd_dev_info odi;
         struct gendisk *disk;
-        struct device *class_member;
 };
 
-static void __uld_get(struct osd_uld_device *oud);
-static void __uld_put(struct osd_uld_device *oud);
+struct osd_dev_handle {
+        struct osd_dev od;
+        struct file *file;
+        struct osd_uld_device *oud;
+} ;
+
+static DEFINE_IDA(osd_minor_ida);
+
+static struct class osd_uld_class = {
+        .owner          = THIS_MODULE,
+        .name           = "scsi_osd",
+};
 
 /*
  * Char Device operations
@@ -101,7 +110,7 @@ static int osd_uld_open(struct inode *inode, struct file *file)
         struct osd_uld_device *oud = container_of(inode->i_cdev,
                                         struct osd_uld_device, cdev);
 
-        __uld_get(oud);
+        get_device(&oud->class_dev);
         /* cache osd_uld_device on file handle */
         file->private_data = oud;
         OSD_DEBUG("osd_uld_open %p\n", oud);
@@ -114,7 +123,7 @@ static int osd_uld_release(struct inode *inode, struct file *file)
 
         OSD_DEBUG("osd_uld_release %p\n", file->private_data);
         file->private_data = NULL;
-        __uld_put(oud);
+        put_device(&oud->class_dev);
         return 0;
 }
 
@@ -177,7 +186,7 @@ static const struct file_operations osd_fops = {
 struct osd_dev *osduld_path_lookup(const char *name)
 {
         struct osd_uld_device *oud;
-        struct osd_dev *od;
+        struct osd_dev_handle *odh;
         struct file *file;
         int error;
 
@@ -186,8 +195,8 @@ struct osd_dev *osduld_path_lookup(const char *name)
                 return ERR_PTR(-EINVAL);
         }
 
-        od = kzalloc(sizeof(*od), GFP_KERNEL);
-        if (!od)
+        odh = kzalloc(sizeof(*odh), GFP_KERNEL);
+        if (unlikely(!odh))
                 return ERR_PTR(-ENOMEM);
 
         file = filp_open(name, O_RDWR, 0);
@@ -203,33 +212,134 @@ struct osd_dev *osduld_path_lookup(const char *name)
 
         oud = file->private_data;
 
-        *od = oud->od;
-        od->file = file;
+        odh->od = oud->od;
+        odh->file = file;
+        odh->oud = oud;
 
-        return od;
+        return &odh->od;
 
 close_file:
         fput(file);
 free_od:
-        kfree(od);
+        kfree(odh);
         return ERR_PTR(error);
 }
 EXPORT_SYMBOL(osduld_path_lookup);
 
-void osduld_put_device(struct osd_dev *od)
+static inline bool _the_same_or_null(const u8 *a1, unsigned a1_len,
+                                     const u8 *a2, unsigned a2_len)
 {
+        if (!a2_len) /* User string is Empty means don't care */
+                return true;
+
+        if (a1_len != a2_len)
+                return false;
+
+        return 0 == memcmp(a1, a2, a1_len);
+}
+
+struct find_oud_t {
+        const struct osd_dev_info *odi;
+        struct device *dev;
+        struct osd_uld_device *oud;
+} ;
+
+int _mach_odi(struct device *dev, void *find_data)
+{
+        struct osd_uld_device *oud = container_of(dev, struct osd_uld_device,
+                                                  class_dev);
+        struct find_oud_t *fot = find_data;
+        const struct osd_dev_info *odi = fot->odi;
+
+        if (_the_same_or_null(oud->odi.systemid, oud->odi.systemid_len,
+                              odi->systemid, odi->systemid_len) &&
+            _the_same_or_null(oud->odi.osdname, oud->odi.osdname_len,
+                              odi->osdname, odi->osdname_len)) {
+                OSD_DEBUG("found device sysid_len=%d osdname=%d\n",
+                          odi->systemid_len, odi->osdname_len);
+                fot->oud = oud;
+                return 1;
+        } else {
+                return 0;
+        }
+}
+
+/* osduld_info_lookup - Loop through all devices, return the requested osd_dev.
+ *
+ * if @odi->systemid_len and/or @odi->osdname_len are zero, they act as a don't
+ * care. .e.g if they're both zero /dev/osd0 is returned.
+ */
+struct osd_dev *osduld_info_lookup(const struct osd_dev_info *odi)
+{
+        struct find_oud_t find = {.odi = odi};
+
+        find.dev = class_find_device(&osd_uld_class, NULL, &find, _mach_odi);
+        if (likely(find.dev)) {
+                struct osd_dev_handle *odh = kzalloc(sizeof(*odh), GFP_KERNEL);
+
+                if (unlikely(!odh)) {
+                        put_device(find.dev);
+                        return ERR_PTR(-ENOMEM);
+                }
 
+                odh->od = find.oud->od;
+                odh->oud = find.oud;
+
+                return &odh->od;
+        }
+
+        return ERR_PTR(-ENODEV);
+}
+EXPORT_SYMBOL(osduld_info_lookup);
+
+void osduld_put_device(struct osd_dev *od)
+{
         if (od && !IS_ERR(od)) {
-                struct osd_uld_device *oud = od->file->private_data;
+                struct osd_dev_handle *odh =
+                                container_of(od, struct osd_dev_handle, od);
+                struct osd_uld_device *oud = odh->oud;
 
                 BUG_ON(od->scsi_device != oud->od.scsi_device);
 
-                fput(od->file);
-                kfree(od);
+                /* If scsi has released the device (logout), and exofs has last
+                 * reference on oud it will be freed by above osd_uld_release
+                 * within fput below. But this will oops in cdev_release which
+                 * is called after the fops->release. A get_/put_ pair makes
+                 * sure we have a cdev for the duration of fput
+                 */
+                if (odh->file) {
+                        get_device(&oud->class_dev);
+                        fput(odh->file);
+                }
+                put_device(&oud->class_dev);
+                kfree(odh);
         }
 }
 EXPORT_SYMBOL(osduld_put_device);
 
+const struct osd_dev_info *osduld_device_info(struct osd_dev *od)
+{
+        struct osd_dev_handle *odh =
+                                container_of(od, struct osd_dev_handle, od);
+        return &odh->oud->odi;
+}
+EXPORT_SYMBOL(osduld_device_info);
+
+bool osduld_device_same(struct osd_dev *od, const struct osd_dev_info *odi)
+{
+        struct osd_dev_handle *odh =
+                                container_of(od, struct osd_dev_handle, od);
+        struct osd_uld_device *oud = odh->oud;
+
+        return (oud->odi.systemid_len == odi->systemid_len) &&
+                _the_same_or_null(oud->odi.systemid, oud->odi.systemid_len,
+                                 odi->systemid, odi->systemid_len) &&
+                (oud->odi.osdname_len == odi->osdname_len) &&
+                _the_same_or_null(oud->odi.osdname, oud->odi.osdname_len,
+                                  odi->osdname, odi->osdname_len);
+}
+EXPORT_SYMBOL(osduld_device_same);
+
 /*
  * Scsi Device operations
  */
@@ -250,14 +360,35 @@ static int __detect_osd(struct osd_uld_device *oud)
                 OSD_ERR("warning: scsi_test_unit_ready failed\n");
 
         osd_sec_init_nosec_doall_caps(caps, &osd_root_object, false, true);
-        if (osd_auto_detect_ver(&oud->od, caps))
+        if (osd_auto_detect_ver(&oud->od, caps, &oud->odi))
                 return -ENODEV;
 
         return 0;
 }
 
-static struct class *osd_sysfs_class;
-static DEFINE_IDA(osd_minor_ida);
+static void __remove(struct device *dev)
+{
+        struct osd_uld_device *oud = container_of(dev, struct osd_uld_device,
+                                                  class_dev);
+        struct scsi_device *scsi_device = oud->od.scsi_device;
+
+        kfree(oud->odi.osdname);
+
+        if (oud->cdev.owner)
+                cdev_del(&oud->cdev);
+
+        osd_dev_fini(&oud->od);
+        scsi_device_put(scsi_device);
+
+        OSD_INFO("osd_remove %s\n",
+                 oud->disk ? oud->disk->disk_name : NULL);
+
+        if (oud->disk)
+                put_disk(oud->disk);
+        ida_remove(&osd_minor_ida, oud->minor);
+
+        kfree(oud);
+}
 
 static int osd_probe(struct device *dev)
 {
@@ -289,7 +420,6 @@ static int osd_probe(struct device *dev)
         if (NULL == oud)
                 goto err_retract_minor;
 
-        kref_init(&oud->kref);
         dev_set_drvdata(dev, oud);
         oud->minor = minor;
 
@@ -327,18 +457,25 @@ static int osd_probe(struct device *dev)
                 OSD_ERR("cdev_add failed\n");
                 goto err_put_disk;
         }
-        kobject_get(&oud->cdev.kobj); /* 2nd ref see osd_remove() */
-
-        /* class_member */
-        oud->class_member = device_create(osd_sysfs_class, dev,
-                MKDEV(SCSI_OSD_MAJOR, oud->minor), "%s", disk->disk_name);
-        if (IS_ERR(oud->class_member)) {
-                OSD_ERR("class_device_create failed\n");
-                error = PTR_ERR(oud->class_member);
+
+        /* class device member */
+        oud->class_dev.devt = oud->cdev.dev;
+        oud->class_dev.class = &osd_uld_class;
+        oud->class_dev.parent = dev;
+        oud->class_dev.release = __remove;
+        error = dev_set_name(&oud->class_dev, disk->disk_name);
+        if (error) {
+                OSD_ERR("dev_set_name failed => %d\n", error);
+                goto err_put_cdev;
+        }
+
+        error = device_register(&oud->class_dev);
+        if (error) {
+                OSD_ERR("device_register failed => %d\n", error);
                 goto err_put_cdev;
         }
 
-        dev_set_drvdata(oud->class_member, oud);
+        get_device(&oud->class_dev);
 
         OSD_INFO("osd_probe %s\n", disk->disk_name);
         return 0;
@@ -367,54 +504,12 @@ static int osd_remove(struct device *dev)
                         scsi_device);
         }
 
-        if (oud->class_member)
-                device_destroy(osd_sysfs_class,
-                               MKDEV(SCSI_OSD_MAJOR, oud->minor));
+        device_unregister(&oud->class_dev);
 
-        /* We have 2 references to the cdev. One is released here
-         * and also takes down the /dev/osdX mapping. The second
-         * Will be released in __remove() after all users have released
-         * the osd_uld_device.
-         */
-        if (oud->cdev.owner)
-                cdev_del(&oud->cdev);
-
-        __uld_put(oud);
+        put_device(&oud->class_dev);
         return 0;
 }
 
-static void __remove(struct kref *kref)
-{
-        struct osd_uld_device *oud = container_of(kref,
-                                        struct osd_uld_device, kref);
-        struct scsi_device *scsi_device = oud->od.scsi_device;
-
-        /* now let delete the char_dev */
-        kobject_put(&oud->cdev.kobj);
-
-        osd_dev_fini(&oud->od);
-        scsi_device_put(scsi_device);
-
-        OSD_INFO("osd_remove %s\n",
-                 oud->disk ? oud->disk->disk_name : NULL);
-
-        if (oud->disk)
-                put_disk(oud->disk);
-
-        ida_remove(&osd_minor_ida, oud->minor);
-        kfree(oud);
-}
-
-static void __uld_get(struct osd_uld_device *oud)
-{
-        kref_get(&oud->kref);
-}
-
-static void __uld_put(struct osd_uld_device *oud)
-{
-        kref_put(&oud->kref, __remove);
-}
-
 /*
  * Global driver and scsi registration
  */
@@ -432,11 +527,10 @@ static int __init osd_uld_init(void)
 {
         int err;
 
-        osd_sysfs_class = class_create(THIS_MODULE, osd_symlink);
-        if (IS_ERR(osd_sysfs_class)) {
-                OSD_ERR("Unable to register sysfs class => %ld\n",
-                        PTR_ERR(osd_sysfs_class));
-                return PTR_ERR(osd_sysfs_class);
+        err = class_register(&osd_uld_class);
+        if (err) {
+                OSD_ERR("Unable to register sysfs class => %d\n", err);
+                return err;
         }
 
         err = register_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0),
@@ -459,7 +553,7 @@ static int __init osd_uld_init(void)
 err_out_chrdev:
         unregister_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0), SCSI_OSD_MAX_MINOR);
 err_out:
-        class_destroy(osd_sysfs_class);
+        class_unregister(&osd_uld_class);
         return err;
 }
 
@@ -467,7 +561,7 @@ static void __exit osd_uld_exit(void)
 {
         scsi_unregister_driver(&osd_driver.gendrv);
         unregister_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0), SCSI_OSD_MAX_MINOR);
-        class_destroy(osd_sysfs_class);
+        class_unregister(&osd_uld_class);
         OSD_INFO("UNLOADED %s\n", osd_version_string);
 }