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LU-5844 get rid of IOC_LIBCFS_MEMHOG and IOC_LIBCFS_PANIC ioctls
[fs/lustre-release.git] / libcfs / libcfs / module.c
index 6b3ace5..694bbb4 100644 (file)
 #include <libcfs/libcfs_crypto.h>
 #include <lnet/lib-lnet.h>
 
-static void
-kportal_memhog_free (struct libcfs_device_userstate *ldu)
-{
-       struct page **level0p = &ldu->ldu_memhog_root_page;
-       struct page **level1p;
-       struct page **level2p;
-       int           count1;
-       int           count2;
-
-       if (*level0p != NULL) {
-               level1p = (struct page **)page_address(*level0p);
-               count1 = 0;
-
-               while (count1 < PAGE_CACHE_SIZE/sizeof(struct page *) &&
-                      *level1p != NULL) {
-
-                       level2p = (struct page **)page_address(*level1p);
-                       count2 = 0;
-
-                       while (count2 < PAGE_CACHE_SIZE/sizeof(struct page *) &&
-                              *level2p != NULL) {
-
-                               __free_page(*level2p);
-                               ldu->ldu_memhog_pages--;
-                               level2p++;
-                               count2++;
-                       }
-
-                       __free_page(*level1p);
-                       ldu->ldu_memhog_pages--;
-                       level1p++;
-                       count1++;
-               }
-
-               __free_page(*level0p);
-               ldu->ldu_memhog_pages--;
-
-               *level0p = NULL;
-       }
-
-       LASSERT(ldu->ldu_memhog_pages == 0);
-}
-
-static int
-kportal_memhog_alloc(struct libcfs_device_userstate *ldu, int npages,
-                    gfp_t flags)
-{
-       struct page **level0p;
-       struct page **level1p;
-       struct page **level2p;
-       int           count1;
-       int           count2;
-
-       LASSERT(ldu->ldu_memhog_pages == 0);
-       LASSERT(ldu->ldu_memhog_root_page == NULL);
-
-       if (npages < 0)
-               return -EINVAL;
-
-       if (npages == 0)
-               return 0;
-
-       level0p = &ldu->ldu_memhog_root_page;
-       *level0p = alloc_page(flags);
-       if (*level0p == NULL)
-               return -ENOMEM;
-       ldu->ldu_memhog_pages++;
-
-       level1p = (struct page **)page_address(*level0p);
-       count1 = 0;
-       memset(level1p, 0, PAGE_CACHE_SIZE);
-
-       while (ldu->ldu_memhog_pages < npages &&
-              count1 < PAGE_CACHE_SIZE/sizeof(struct page *)) {
-
-               if (signal_pending(current))
-                       return -EINTR;
-
-               *level1p = alloc_page(flags);
-               if (*level1p == NULL)
-                       return -ENOMEM;
-               ldu->ldu_memhog_pages++;
-
-               level2p = (struct page **)page_address(*level1p);
-               count2 = 0;
-               memset(level2p, 0, PAGE_CACHE_SIZE);
-
-               while (ldu->ldu_memhog_pages < npages &&
-                      count2 < PAGE_CACHE_SIZE/sizeof(struct page *)) {
-
-                       if (signal_pending(current))
-                               return -EINTR;
-
-                       *level2p = alloc_page(flags);
-                       if (*level2p == NULL)
-                               return -ENOMEM;
-                       ldu->ldu_memhog_pages++;
-
-                       level2p++;
-                       count2++;
-               }
-
-               level1p++;
-               count1++;
-       }
-
-       return 0;
-}
-
-/* called when opening /dev/device */
-static int libcfs_psdev_open(unsigned long flags, void *args)
-{
-       struct libcfs_device_userstate *ldu;
-       ENTRY;
-
-       try_module_get(THIS_MODULE);
-
-       LIBCFS_ALLOC(ldu, sizeof(*ldu));
-       if (ldu != NULL) {
-               ldu->ldu_memhog_pages = 0;
-               ldu->ldu_memhog_root_page = NULL;
-       }
-       *(struct libcfs_device_userstate **)args = ldu;
-
-       RETURN(0);
-}
-
-/* called when closing /dev/device */
-static int libcfs_psdev_release(unsigned long flags, void *args)
-{
-       struct libcfs_device_userstate *ldu;
-       ENTRY;
-
-       ldu = (struct libcfs_device_userstate *)args;
-       if (ldu != NULL) {
-               kportal_memhog_free(ldu);
-               LIBCFS_FREE(ldu, sizeof(*ldu));
-       }
-
-       module_put(THIS_MODULE);
-       RETURN(0);
-}
-
 static DECLARE_RWSEM(ioctl_list_sem);
 static LIST_HEAD(ioctl_list);
 
@@ -216,8 +73,7 @@ int libcfs_deregister_ioctl(struct libcfs_ioctl_handler *hand)
 }
 EXPORT_SYMBOL(libcfs_deregister_ioctl);
 
-static int libcfs_ioctl(struct cfs_psdev_file *pfile,
-                       unsigned long cmd, void __user *uparam)
+int libcfs_ioctl(unsigned long cmd, void __user *uparam)
 {
        struct libcfs_ioctl_data *data = NULL;
        struct libcfs_ioctl_hdr  *hdr;
@@ -248,10 +104,6 @@ static int libcfs_ioctl(struct cfs_psdev_file *pfile,
        case IOC_LIBCFS_CLEAR_DEBUG:
                libcfs_debug_clear_buffer();
                break;
-       /*
-        * case IOC_LIBCFS_PANIC:
-        * Handled in arch/cfs_module.c
-        */
        case IOC_LIBCFS_MARK_DEBUG:
                if (data == NULL ||
                    data->ioc_inlbuf1 == NULL ||
@@ -261,20 +113,6 @@ static int libcfs_ioctl(struct cfs_psdev_file *pfile,
                libcfs_debug_mark_buffer(data->ioc_inlbuf1);
                break;
 
-       case IOC_LIBCFS_MEMHOG:
-               if (data == NULL)
-                       GOTO(out, err = -EINVAL);
-
-               if (pfile->private_data == NULL)
-                       GOTO(out, err = -EINVAL);
-
-               kportal_memhog_free(pfile->private_data);
-               err = kportal_memhog_alloc(pfile->private_data,
-                                          data->ioc_count, data->ioc_flags);
-               if (err != 0)
-                       kportal_memhog_free(pfile->private_data);
-               break;
-
        default: {
                struct libcfs_ioctl_handler *hand;
 
@@ -299,14 +137,6 @@ out:
        RETURN(err);
 }
 
-struct cfs_psdev_ops libcfs_psdev_ops = {
-        libcfs_psdev_open,
-        libcfs_psdev_release,
-        NULL,
-        NULL,
-        libcfs_ioctl
-};
-
 static int __init libcfs_init(void)
 {
        int rc;