1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @brief Block Device Management |
---|
5 | * @ingroup rtems_blkdev |
---|
6 | */ |
---|
7 | |
---|
8 | /* |
---|
9 | * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia |
---|
10 | * Author: Victor V. Vengerov <vvv@oktet.ru> |
---|
11 | */ |
---|
12 | |
---|
13 | #if HAVE_CONFIG_H |
---|
14 | #include "config.h" |
---|
15 | #endif |
---|
16 | |
---|
17 | #include <errno.h> |
---|
18 | #include <string.h> |
---|
19 | |
---|
20 | #include <rtems.h> |
---|
21 | #include <rtems/libio.h> |
---|
22 | #include <sys/ioctl.h> |
---|
23 | |
---|
24 | #include "rtems/diskdevs.h" |
---|
25 | #include "rtems/bdbuf.h" |
---|
26 | |
---|
27 | /* rtems_blkdev_generic_read -- |
---|
28 | * Generic block device read primitive. Implemented using block device |
---|
29 | * buffer management primitives. |
---|
30 | */ |
---|
31 | rtems_device_driver |
---|
32 | rtems_blkdev_generic_read( |
---|
33 | rtems_device_major_number major __attribute__((unused)), |
---|
34 | rtems_device_minor_number minor __attribute__((unused)), |
---|
35 | void * arg) |
---|
36 | { |
---|
37 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
---|
38 | rtems_libio_rw_args_t *args = arg; |
---|
39 | rtems_libio_t *iop = args->iop; |
---|
40 | rtems_disk_device *dd = iop->data1; |
---|
41 | uint32_t block_size = dd->block_size; |
---|
42 | char *buf = args->buffer; |
---|
43 | uint32_t count = args->count; |
---|
44 | rtems_blkdev_bnum block = (rtems_blkdev_bnum) (args->offset / block_size); |
---|
45 | uint32_t blkofs = (uint32_t) (args->offset % block_size); |
---|
46 | |
---|
47 | args->bytes_moved = 0; |
---|
48 | |
---|
49 | while (count > 0) |
---|
50 | { |
---|
51 | rtems_bdbuf_buffer *diskbuf; |
---|
52 | uint32_t copy; |
---|
53 | |
---|
54 | rc = rtems_bdbuf_read(dd, block, &diskbuf); |
---|
55 | if (rc != RTEMS_SUCCESSFUL) |
---|
56 | break; |
---|
57 | copy = block_size - blkofs; |
---|
58 | if (copy > count) |
---|
59 | copy = count; |
---|
60 | memcpy(buf, (char *)diskbuf->buffer + blkofs, copy); |
---|
61 | rc = rtems_bdbuf_release(diskbuf); |
---|
62 | args->bytes_moved += copy; |
---|
63 | if (rc != RTEMS_SUCCESSFUL) |
---|
64 | break; |
---|
65 | count -= copy; |
---|
66 | buf += copy; |
---|
67 | blkofs = 0; |
---|
68 | block++; |
---|
69 | } |
---|
70 | |
---|
71 | return rc; |
---|
72 | } |
---|
73 | |
---|
74 | /* rtems_blkdev_generic_write -- |
---|
75 | * Generic block device write primitive. Implemented using block device |
---|
76 | * buffer management primitives. |
---|
77 | */ |
---|
78 | rtems_device_driver |
---|
79 | rtems_blkdev_generic_write( |
---|
80 | rtems_device_major_number major __attribute__((unused)), |
---|
81 | rtems_device_minor_number minor __attribute__((unused)), |
---|
82 | void * arg) |
---|
83 | { |
---|
84 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
---|
85 | rtems_libio_rw_args_t *args = arg; |
---|
86 | rtems_libio_t *iop = args->iop; |
---|
87 | rtems_disk_device *dd = iop->data1; |
---|
88 | uint32_t block_size = dd->block_size; |
---|
89 | char *buf = args->buffer; |
---|
90 | uint32_t count = args->count; |
---|
91 | rtems_blkdev_bnum block = (rtems_blkdev_bnum) (args->offset / block_size); |
---|
92 | uint32_t blkofs = (uint32_t) (args->offset % block_size); |
---|
93 | |
---|
94 | args->bytes_moved = 0; |
---|
95 | |
---|
96 | while (count > 0) |
---|
97 | { |
---|
98 | rtems_bdbuf_buffer *diskbuf; |
---|
99 | uint32_t copy; |
---|
100 | |
---|
101 | if ((blkofs == 0) && (count >= block_size)) |
---|
102 | rc = rtems_bdbuf_get(dd, block, &diskbuf); |
---|
103 | else |
---|
104 | rc = rtems_bdbuf_read(dd, block, &diskbuf); |
---|
105 | if (rc != RTEMS_SUCCESSFUL) |
---|
106 | break; |
---|
107 | |
---|
108 | copy = block_size - blkofs; |
---|
109 | if (copy > count) |
---|
110 | copy = count; |
---|
111 | memcpy((char *)diskbuf->buffer + blkofs, buf, copy); |
---|
112 | args->bytes_moved += copy; |
---|
113 | |
---|
114 | rc = rtems_bdbuf_release_modified(diskbuf); |
---|
115 | if (rc != RTEMS_SUCCESSFUL) |
---|
116 | break; |
---|
117 | |
---|
118 | count -= copy; |
---|
119 | buf += copy; |
---|
120 | blkofs = 0; |
---|
121 | block++; |
---|
122 | } |
---|
123 | |
---|
124 | return rc; |
---|
125 | } |
---|
126 | |
---|
127 | /* blkdev_generic_open -- |
---|
128 | * Generic block device open primitive. |
---|
129 | */ |
---|
130 | rtems_device_driver |
---|
131 | rtems_blkdev_generic_open( |
---|
132 | rtems_device_major_number major, |
---|
133 | rtems_device_minor_number minor, |
---|
134 | void * arg) |
---|
135 | { |
---|
136 | rtems_libio_open_close_args_t *oc = arg; |
---|
137 | rtems_libio_t *iop = oc->iop; |
---|
138 | dev_t dev = rtems_filesystem_make_dev_t(major, minor); |
---|
139 | rtems_disk_device *dd = rtems_disk_obtain(dev); |
---|
140 | |
---|
141 | iop->data1 = dd; |
---|
142 | |
---|
143 | if (dd != NULL) |
---|
144 | return RTEMS_SUCCESSFUL; |
---|
145 | else |
---|
146 | return RTEMS_UNSATISFIED; |
---|
147 | } |
---|
148 | |
---|
149 | |
---|
150 | /* blkdev_generic_close -- |
---|
151 | * Generic block device close primitive. |
---|
152 | */ |
---|
153 | rtems_device_driver |
---|
154 | rtems_blkdev_generic_close( |
---|
155 | rtems_device_major_number major __attribute__((unused)), |
---|
156 | rtems_device_minor_number minor __attribute__((unused)), |
---|
157 | void * arg) |
---|
158 | { |
---|
159 | rtems_libio_open_close_args_t *oc = arg; |
---|
160 | rtems_libio_t *iop = oc->iop; |
---|
161 | rtems_disk_device *dd = iop->data1; |
---|
162 | |
---|
163 | rtems_disk_release(dd); |
---|
164 | |
---|
165 | return RTEMS_SUCCESSFUL; |
---|
166 | } |
---|
167 | |
---|
168 | /* blkdev_generic_ioctl -- |
---|
169 | * Generic block device ioctl primitive. |
---|
170 | */ |
---|
171 | rtems_device_driver |
---|
172 | rtems_blkdev_generic_ioctl( |
---|
173 | rtems_device_major_number major __attribute__((unused)), |
---|
174 | rtems_device_minor_number minor __attribute__((unused)), |
---|
175 | void * arg) |
---|
176 | { |
---|
177 | rtems_libio_ioctl_args_t *args = arg; |
---|
178 | rtems_libio_t *iop = args->iop; |
---|
179 | rtems_disk_device *dd = iop->data1; |
---|
180 | |
---|
181 | if (args->command != RTEMS_BLKIO_REQUEST) |
---|
182 | { |
---|
183 | args->ioctl_return = dd->ioctl(dd, |
---|
184 | args->command, |
---|
185 | args->buffer); |
---|
186 | } |
---|
187 | else |
---|
188 | { |
---|
189 | /* |
---|
190 | * It is not allowed to directly access the driver circumventing the |
---|
191 | * cache. |
---|
192 | */ |
---|
193 | args->ioctl_return = -1; |
---|
194 | } |
---|
195 | |
---|
196 | return RTEMS_SUCCESSFUL; |
---|
197 | } |
---|