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1 | /* | |
2 | * ide-floppy IOCTLs handling. | |
3 | */ | |
4 | ||
5 | #include <linux/kernel.h> | |
6 | #include <linux/ide.h> | |
7 | #include <linux/cdrom.h> | |
8 | #include <linux/mutex.h> | |
9 | ||
10 | #include <asm/unaligned.h> | |
11 | ||
12 | #include <scsi/scsi_ioctl.h> | |
13 | ||
14 | #include "ide-floppy.h" | |
15 | ||
16 | /* | |
17 | * Obtain the list of formattable capacities. | |
18 | * Very similar to ide_floppy_get_capacity, except that we push the capacity | |
19 | * descriptors to userland, instead of our own structures. | |
20 | * | |
21 | * Userland gives us the following structure: | |
22 | * | |
23 | * struct idefloppy_format_capacities { | |
24 | * int nformats; | |
25 | * struct { | |
26 | * int nblocks; | |
27 | * int blocksize; | |
28 | * } formats[]; | |
29 | * }; | |
30 | * | |
31 | * userland initializes nformats to the number of allocated formats[] records. | |
32 | * On exit we set nformats to the number of records we've actually initialized. | |
33 | */ | |
34 | ||
35 | static DEFINE_MUTEX(ide_floppy_ioctl_mutex); | |
36 | static int ide_floppy_get_format_capacities(ide_drive_t *drive, | |
37 | struct ide_atapi_pc *pc, | |
38 | int __user *arg) | |
39 | { | |
40 | struct ide_disk_obj *floppy = drive->driver_data; | |
41 | int i, blocks, length, u_array_size, u_index; | |
42 | int __user *argp; | |
43 | u8 pc_buf[256], header_len, desc_cnt; | |
44 | ||
45 | if (get_user(u_array_size, arg)) | |
46 | return -EFAULT; | |
47 | ||
48 | if (u_array_size <= 0) | |
49 | return -EINVAL; | |
50 | ||
51 | ide_floppy_create_read_capacity_cmd(pc); | |
52 | ||
53 | if (ide_queue_pc_tail(drive, floppy->disk, pc, pc_buf, pc->req_xfer)) { | |
54 | printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n"); | |
55 | return -EIO; | |
56 | } | |
57 | ||
58 | header_len = pc_buf[3]; | |
59 | desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */ | |
60 | ||
61 | u_index = 0; | |
62 | argp = arg + 1; | |
63 | ||
64 | /* | |
65 | * We always skip the first capacity descriptor. That's the current | |
66 | * capacity. We are interested in the remaining descriptors, the | |
67 | * formattable capacities. | |
68 | */ | |
69 | for (i = 1; i < desc_cnt; i++) { | |
70 | unsigned int desc_start = 4 + i*8; | |
71 | ||
72 | if (u_index >= u_array_size) | |
73 | break; /* User-supplied buffer too small */ | |
74 | ||
75 | blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]); | |
76 | length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]); | |
77 | ||
78 | if (put_user(blocks, argp)) | |
79 | return -EFAULT; | |
80 | ||
81 | ++argp; | |
82 | ||
83 | if (put_user(length, argp)) | |
84 | return -EFAULT; | |
85 | ||
86 | ++argp; | |
87 | ||
88 | ++u_index; | |
89 | } | |
90 | ||
91 | if (put_user(u_index, arg)) | |
92 | return -EFAULT; | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc, | |
98 | u8 *buf, int b, int l, | |
99 | int flags) | |
100 | { | |
101 | ide_init_pc(pc); | |
102 | pc->c[0] = GPCMD_FORMAT_UNIT; | |
103 | pc->c[1] = 0x17; | |
104 | ||
105 | memset(buf, 0, 12); | |
106 | buf[1] = 0xA2; | |
107 | /* Default format list header, u8 1: FOV/DCRT/IMM bits set */ | |
108 | ||
109 | if (flags & 1) /* Verify bit on... */ | |
110 | buf[1] ^= 0x20; /* ... turn off DCRT bit */ | |
111 | buf[3] = 8; | |
112 | ||
113 | put_unaligned(cpu_to_be32(b), (unsigned int *)(&buf[4])); | |
114 | put_unaligned(cpu_to_be32(l), (unsigned int *)(&buf[8])); | |
115 | pc->req_xfer = 12; | |
116 | pc->flags |= PC_FLAG_WRITING; | |
117 | } | |
118 | ||
119 | static int ide_floppy_get_sfrp_bit(ide_drive_t *drive, struct ide_atapi_pc *pc) | |
120 | { | |
121 | struct ide_disk_obj *floppy = drive->driver_data; | |
122 | u8 buf[20]; | |
123 | ||
124 | drive->atapi_flags &= ~IDE_AFLAG_SRFP; | |
125 | ||
126 | ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_CAPABILITIES_PAGE); | |
127 | pc->flags |= PC_FLAG_SUPPRESS_ERROR; | |
128 | ||
129 | if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer)) | |
130 | return 1; | |
131 | ||
132 | if (buf[8 + 2] & 0x40) | |
133 | drive->atapi_flags |= IDE_AFLAG_SRFP; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static int ide_floppy_format_unit(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
139 | int __user *arg) | |
140 | { | |
141 | struct ide_disk_obj *floppy = drive->driver_data; | |
142 | u8 buf[12]; | |
143 | int blocks, length, flags, err = 0; | |
144 | ||
145 | if (floppy->openers > 1) { | |
146 | /* Don't format if someone is using the disk */ | |
147 | drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS; | |
148 | return -EBUSY; | |
149 | } | |
150 | ||
151 | drive->dev_flags |= IDE_DFLAG_FORMAT_IN_PROGRESS; | |
152 | ||
153 | /* | |
154 | * Send ATAPI_FORMAT_UNIT to the drive. | |
155 | * | |
156 | * Userland gives us the following structure: | |
157 | * | |
158 | * struct idefloppy_format_command { | |
159 | * int nblocks; | |
160 | * int blocksize; | |
161 | * int flags; | |
162 | * } ; | |
163 | * | |
164 | * flags is a bitmask, currently, the only defined flag is: | |
165 | * | |
166 | * 0x01 - verify media after format. | |
167 | */ | |
168 | if (get_user(blocks, arg) || | |
169 | get_user(length, arg+1) || | |
170 | get_user(flags, arg+2)) { | |
171 | err = -EFAULT; | |
172 | goto out; | |
173 | } | |
174 | ||
175 | ide_floppy_get_sfrp_bit(drive, pc); | |
176 | ide_floppy_create_format_unit_cmd(pc, buf, blocks, length, flags); | |
177 | ||
178 | if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer)) | |
179 | err = -EIO; | |
180 | ||
181 | out: | |
182 | if (err) | |
183 | drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS; | |
184 | return err; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Get ATAPI_FORMAT_UNIT progress indication. | |
189 | * | |
190 | * Userland gives a pointer to an int. The int is set to a progress | |
191 | * indicator 0-65536, with 65536=100%. | |
192 | * | |
193 | * If the drive does not support format progress indication, we just check | |
194 | * the dsc bit, and return either 0 or 65536. | |
195 | */ | |
196 | ||
197 | static int ide_floppy_get_format_progress(ide_drive_t *drive, | |
198 | struct ide_atapi_pc *pc, | |
199 | int __user *arg) | |
200 | { | |
201 | struct ide_disk_obj *floppy = drive->driver_data; | |
202 | u8 sense_buf[18]; | |
203 | int progress_indication = 0x10000; | |
204 | ||
205 | if (drive->atapi_flags & IDE_AFLAG_SRFP) { | |
206 | ide_create_request_sense_cmd(drive, pc); | |
207 | if (ide_queue_pc_tail(drive, floppy->disk, pc, sense_buf, | |
208 | pc->req_xfer)) | |
209 | return -EIO; | |
210 | ||
211 | if (floppy->sense_key == 2 && | |
212 | floppy->asc == 4 && | |
213 | floppy->ascq == 4) | |
214 | progress_indication = floppy->progress_indication; | |
215 | ||
216 | /* Else assume format_unit has finished, and we're at 0x10000 */ | |
217 | } else { | |
218 | ide_hwif_t *hwif = drive->hwif; | |
219 | unsigned long flags; | |
220 | u8 stat; | |
221 | ||
222 | local_irq_save(flags); | |
223 | stat = hwif->tp_ops->read_status(hwif); | |
224 | local_irq_restore(flags); | |
225 | ||
226 | progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000; | |
227 | } | |
228 | ||
229 | if (put_user(progress_indication, arg)) | |
230 | return -EFAULT; | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
236 | unsigned long arg, unsigned int cmd) | |
237 | { | |
238 | struct ide_disk_obj *floppy = drive->driver_data; | |
239 | struct gendisk *disk = floppy->disk; | |
240 | int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0; | |
241 | ||
242 | if (floppy->openers > 1) | |
243 | return -EBUSY; | |
244 | ||
245 | ide_set_media_lock(drive, disk, prevent); | |
246 | ||
247 | if (cmd == CDROMEJECT) | |
248 | ide_do_start_stop(drive, disk, 2); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | static int ide_floppy_format_ioctl(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
254 | fmode_t mode, unsigned int cmd, | |
255 | void __user *argp) | |
256 | { | |
257 | switch (cmd) { | |
258 | case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED: | |
259 | return 0; | |
260 | case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY: | |
261 | return ide_floppy_get_format_capacities(drive, pc, argp); | |
262 | case IDEFLOPPY_IOCTL_FORMAT_START: | |
263 | if (!(mode & FMODE_WRITE)) | |
264 | return -EPERM; | |
265 | return ide_floppy_format_unit(drive, pc, (int __user *)argp); | |
266 | case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS: | |
267 | return ide_floppy_get_format_progress(drive, pc, argp); | |
268 | default: | |
269 | return -ENOTTY; | |
270 | } | |
271 | } | |
272 | ||
273 | int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev, | |
274 | fmode_t mode, unsigned int cmd, unsigned long arg) | |
275 | { | |
276 | struct ide_atapi_pc pc; | |
277 | void __user *argp = (void __user *)arg; | |
278 | int err; | |
279 | ||
280 | mutex_lock(&ide_floppy_ioctl_mutex); | |
281 | if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) { | |
282 | err = ide_floppy_lockdoor(drive, &pc, arg, cmd); | |
283 | goto out; | |
284 | } | |
285 | ||
286 | err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp); | |
287 | if (err != -ENOTTY) | |
288 | goto out; | |
289 | ||
290 | /* | |
291 | * skip SCSI_IOCTL_SEND_COMMAND (deprecated) | |
292 | * and CDROM_SEND_PACKET (legacy) ioctls | |
293 | */ | |
294 | if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND) | |
295 | err = scsi_cmd_ioctl(bdev->bd_disk->queue, bdev->bd_disk, | |
296 | mode, cmd, argp); | |
297 | ||
298 | if (err == -ENOTTY) | |
299 | err = generic_ide_ioctl(drive, bdev, cmd, arg); | |
300 | ||
301 | out: | |
302 | mutex_unlock(&ide_floppy_ioctl_mutex); | |
303 | return err; | |
304 | } |