1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright 2017 Nexenta Inc. All rights reserved. 14 */ 15 16 /* needed when building libzpool */ 17 #ifndef _KERNEL 18 #include <sys/zfs_context.h> 19 #endif 20 21 #include <sys/sunddi.h> 22 #include <sys/dkio.h> 23 #include <sys/dkioc_free_util.h> 24 #include <sys/sysmacros.h> 25 #include <sys/file.h> 26 #include <sys/sdt.h> 27 28 /* 29 * Copy-in convenience function for variable-length dkioc_free_list_t 30 * structures. The pointer to be copied from is in `arg' (may be a pointer 31 * to userspace). A new buffer is allocated and a pointer to it is placed 32 * in `out'. `ddi_flags' indicates whether the pointer is from user- 33 * or kernelspace (FKIOCTL) and `kmflags' are the flags passed to 34 * kmem_zalloc when allocating the new structure. 35 * Returns 0 on success, or an errno on failure. 36 */ 37 int 38 dfl_copyin(void *arg, dkioc_free_list_t **out, int ddi_flags, int kmflags) 39 { 40 dkioc_free_list_t *dfl; 41 42 if (ddi_flags & FKIOCTL) { 43 dkioc_free_list_t *dfl_in = arg; 44 45 if (dfl_in->dfl_num_exts == 0 || 46 dfl_in->dfl_num_exts > DFL_COPYIN_MAX_EXTS) 47 return (SET_ERROR(EINVAL)); 48 dfl = kmem_alloc(DFL_SZ(dfl_in->dfl_num_exts), kmflags); 49 if (dfl == NULL) 50 return (SET_ERROR(ENOMEM)); 51 bcopy(dfl_in, dfl, DFL_SZ(dfl_in->dfl_num_exts)); 52 } else { 53 uint64_t num_exts; 54 55 if (ddi_copyin(((uint8_t *)arg) + offsetof(dkioc_free_list_t, 56 dfl_num_exts), &num_exts, sizeof (num_exts), 57 ddi_flags) != 0) 58 return (SET_ERROR(EFAULT)); 59 if (num_exts == 0 || num_exts > DFL_COPYIN_MAX_EXTS) 60 return (SET_ERROR(EINVAL)); 61 dfl = kmem_alloc(DFL_SZ(num_exts), kmflags); 62 if (dfl == NULL) 63 return (SET_ERROR(ENOMEM)); 64 if (ddi_copyin(arg, dfl, DFL_SZ(num_exts), ddi_flags) != 0 || 65 dfl->dfl_num_exts != num_exts) { 66 kmem_free(dfl, DFL_SZ(num_exts)); 67 return (SET_ERROR(EFAULT)); 68 } 69 } 70 71 *out = dfl; 72 return (0); 73 } 74 75 /* Frees a variable-length dkioc_free_list_t structure. */ 76 void 77 dfl_free(dkioc_free_list_t *dfl) 78 { 79 kmem_free(dfl, DFL_SZ(dfl->dfl_num_exts)); 80 } 81