diff options
Diffstat (limited to 'drivers/scsi/osd/osd_uld.c')
-rw-r--r-- | drivers/scsi/osd/osd_uld.c | 162 |
1 files changed, 77 insertions, 85 deletions
diff --git a/drivers/scsi/osd/osd_uld.c b/drivers/scsi/osd/osd_uld.c index 1ea6447..fc6fc1c 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 +81,24 @@ 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 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 +109,7 @@ 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 +122,7 @@ 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 +185,7 @@ 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 +194,8 @@ 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); @@ -203,37 +211,39 @@ 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) { - 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); /* 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. __uld_get/put pair makes + * is called after the fops->release. A get_/put_ pair makes * sure we have a cdev for the duration of fput */ - __uld_get(oud); - fput(od->file); - __uld_put(oud); - kfree(od); + get_device(&oud->class_dev); + fput(odh->file); + put_device(&oud->class_dev); + kfree(odh); } } EXPORT_SYMBOL(osduld_put_device); @@ -264,8 +274,27 @@ static int __detect_osd(struct osd_uld_device *oud) 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; + + 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) { @@ -297,7 +326,6 @@ 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; @@ -335,18 +363,25 @@ 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; } - dev_set_drvdata(oud->class_member, oud); + error = device_register(&oud->class_dev); + if (error) { + OSD_ERR("device_register failed => %d\n", error); + goto err_put_cdev; + } + + get_device(&oud->class_dev); OSD_INFO("osd_probe %s\n", disk->disk_name); return 0; @@ -375,54 +410,12 @@ static int osd_remove(struct device *dev) scsi_device); } - if (oud->class_member) - device_destroy(osd_sysfs_class, - MKDEV(SCSI_OSD_MAJOR, oud->minor)); - - /* 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); + device_unregister(&oud->class_dev); - __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 */ @@ -440,11 +433,10 @@ 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), @@ -467,7 +459,7 @@ 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; } @@ -475,7 +467,7 @@ 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); } |