fs/exofs/osd.c

   1 /*
   2  * Copyright (C) 2005, 2006
   3  * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
   4  * Copyright (C) 2005, 2006
   5  * International Business Machines
   6  * Copyright (C) 2008, 2009
   7  * Boaz Harrosh <bharrosh@panasas.com>
   8  *
   9  * This file is part of exofs.
  10  *
  11  * exofs is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation.  Since it is based on ext2, and the only
  14  * valid version of GPL for the Linux kernel is version 2, the only valid
  15  * version of GPL for exofs is version 2.
  16  *
  17  * exofs is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with exofs; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  25  */
  26
  27 #include <scsi/scsi_device.h>
  28 #include <scsi/osd_sense.h>
  29
  30 #include "exofs.h"
  31
  32 int exofs_check_ok_resid(struct osd_request *or, u64 *in_resid, u64 *out_resid)
  33 {
  34         struct osd_sense_info osi;
  35         int ret = osd_req_decode_sense(or, &osi);
  36
  37         if (ret) { /* translate to Linux codes */
  38                 if (osi.additional_code == scsi_invalid_field_in_cdb) {
  39                         if (osi.cdb_field_offset == OSD_CFO_STARTING_BYTE)
  40                                 ret = -EFAULT;
  41                         if (osi.cdb_field_offset == OSD_CFO_OBJECT_ID)
  42                                 ret = -ENOENT;
  43                         else
  44                                 ret = -EINVAL;
  45                 } else if (osi.additional_code == osd_quota_error)
  46                         ret = -ENOSPC;
  47                 else
  48                         ret = -EIO;
  49         }
  50
  51         /* FIXME: should be include in osd_sense_info */
  52         if (in_resid)
  53                 *in_resid = or->in.req ? or->in.req->data_len : 0;
  54
  55         if (out_resid)
  56                 *out_resid = or->out.req ? or->out.req->data_len : 0;
  57
  58         return ret;
  59 }
  60
  61 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
  62 {
  63         osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
  64 }
  65
  66 /*
  67  * Perform a synchronous OSD operation.
  68  */
  69 int exofs_sync_op(struct osd_request *or, int timeout, uint8_t *credential)
  70 {
  71         int ret;
  72
  73         or->timeout = timeout;
  74         ret = osd_finalize_request(or, 0, credential, NULL);
  75         if (ret) {
  76                 EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
  77                 return ret;
  78         }
  79
  80         ret = osd_execute_request(or);
  81
  82         if (ret)
  83                 EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
  84         /* osd_req_decode_sense(or, ret); */
  85         return ret;
  86 }
  87
  88 /*
  89  * Perform an asynchronous OSD operation.
  90  */
  91 int exofs_async_op(struct osd_request *or, osd_req_done_fn *async_done,
  92                    void *caller_context, u8 *cred)
  93 {
  94         int ret;
  95
  96         ret = osd_finalize_request(or, 0, cred, NULL);
  97         if (ret) {
  98                 EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
  99                 return ret;
 100         }
 101
 102         ret = osd_execute_request_async(or, async_done, caller_context);
 103
 104         if (ret)
 105                 EXOFS_DBGMSG("osd_execute_request_async() => %d\n", ret);
 106         return ret;
 107 }
 108
 109 int extract_attr_from_req(struct osd_request *or, struct osd_attr *attr)
 110 {
 111         struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
 112         void *iter = NULL;
 113         int nelem;
 114
 115         do {
 116                 nelem = 1;
 117                 osd_req_decode_get_attr_list(or, &cur_attr, &nelem, &iter);
 118                 if ((cur_attr.attr_page == attr->attr_page) &&
 119                     (cur_attr.attr_id == attr->attr_id)) {
 120                         attr->len = cur_attr.len;
 121                         attr->val_ptr = cur_attr.val_ptr;
 122                         return 0;
 123                 }
 124         } while (iter);
 125
 126         return -EIO;
 127 }
 128
 129 int osd_req_read_kern(struct osd_request *or,
 130         const struct osd_obj_id *obj, u64 offset, void* buff, u64 len)
 131 {
 132         struct request_queue *req_q = or->osd_dev->scsi_device->request_queue;
 133         struct bio *bio = bio_map_kern(req_q, buff, len, GFP_KERNEL);
 134
 135         if (!bio)
 136                 return -ENOMEM;
 137
 138         osd_req_read(or, obj, bio, offset);
 139         return 0;
 140 }
 141
 142 int osd_req_write_kern(struct osd_request *or,
 143         const struct osd_obj_id *obj, u64 offset, void* buff, u64 len)
 144 {
 145         struct request_queue *req_q = or->osd_dev->scsi_device->request_queue;
 146         struct bio *bio = bio_map_kern(req_q, buff, len, GFP_KERNEL);
 147
 148         if (!bio)
 149                 return -ENOMEM;
 150
 151         osd_req_write(or, obj, bio, offset);
 152         return 0;
 153 }