Merge /spare/repo/linux-2.6/
[linux-2.6] / drivers / scsi / scsi_devinfo.c
1
2 #include <linux/blkdev.h>
3 #include <linux/init.h>
4 #include <linux/kernel.h>
5 #include <linux/module.h>
6 #include <linux/moduleparam.h>
7 #include <linux/proc_fs.h>
8 #include <linux/seq_file.h>
9
10 #include <scsi/scsi_device.h>
11 #include <scsi/scsi_devinfo.h>
12
13 #include "scsi_priv.h"
14
15
16 /*
17  * scsi_dev_info_list: structure to hold black/white listed devices.
18  */
19 struct scsi_dev_info_list {
20         struct list_head dev_info_list;
21         char vendor[8];
22         char model[16];
23         unsigned flags;
24         unsigned compatible; /* for use with scsi_static_device_list entries */
25 };
26
27
28 static const char spaces[] = "                "; /* 16 of them */
29 static unsigned scsi_default_dev_flags;
30 static LIST_HEAD(scsi_dev_info_list);
31 static char scsi_dev_flags[256];
32
33 /*
34  * scsi_static_device_list: deprecated list of devices that require
35  * settings that differ from the default, includes black-listed (broken)
36  * devices. The entries here are added to the tail of scsi_dev_info_list
37  * via scsi_dev_info_list_init.
38  *
39  * Do not add to this list, use the command line or proc interface to add
40  * to the scsi_dev_info_list. This table will eventually go away.
41  */
42 static struct {
43         char *vendor;
44         char *model;
45         char *revision; /* revision known to be bad, unused */
46         unsigned flags;
47 } scsi_static_device_list[] __initdata = {
48         /*
49          * The following devices are known not to tolerate a lun != 0 scan
50          * for one reason or another. Some will respond to all luns,
51          * others will lock up.
52          */
53         {"Aashima", "IMAGERY 2400SP", "1.03", BLIST_NOLUN},     /* locks up */
54         {"CHINON", "CD-ROM CDS-431", "H42", BLIST_NOLUN},       /* locks up */
55         {"CHINON", "CD-ROM CDS-535", "Q14", BLIST_NOLUN},       /* locks up */
56         {"DENON", "DRD-25X", "V", BLIST_NOLUN},                 /* locks up */
57         {"HITACHI", "DK312C", "CM81", BLIST_NOLUN},     /* responds to all lun */
58         {"HITACHI", "DK314C", "CR21", BLIST_NOLUN},     /* responds to all lun */
59         {"IMS", "CDD521/10", "2.06", BLIST_NOLUN},      /* locks up */
60         {"MAXTOR", "XT-3280", "PR02", BLIST_NOLUN},     /* locks up */
61         {"MAXTOR", "XT-4380S", "B3C", BLIST_NOLUN},     /* locks up */
62         {"MAXTOR", "MXT-1240S", "I1.2", BLIST_NOLUN},   /* locks up */
63         {"MAXTOR", "XT-4170S", "B5A", BLIST_NOLUN},     /* locks up */
64         {"MAXTOR", "XT-8760S", "B7B", BLIST_NOLUN},     /* locks up */
65         {"MEDIAVIS", "RENO CD-ROMX2A", "2.03", BLIST_NOLUN},    /* responds to all lun */
66         {"MICROTEK", "ScanMakerIII", "2.30", BLIST_NOLUN},      /* responds to all lun */
67         {"NEC", "CD-ROM DRIVE:841", "1.0", BLIST_NOLUN},/* locks up */
68         {"PHILIPS", "PCA80SC", "V4-2", BLIST_NOLUN},    /* responds to all lun */
69         {"RODIME", "RO3000S", "2.33", BLIST_NOLUN},     /* locks up */
70         {"SUN", "SENA", NULL, BLIST_NOLUN},             /* responds to all luns */
71         /*
72          * The following causes a failed REQUEST SENSE on lun 1 for
73          * aha152x controller, which causes SCSI code to reset bus.
74          */
75         {"SANYO", "CRD-250S", "1.20", BLIST_NOLUN},
76         /*
77          * The following causes a failed REQUEST SENSE on lun 1 for
78          * aha152x controller, which causes SCSI code to reset bus.
79          */
80         {"SEAGATE", "ST157N", "\004|j", BLIST_NOLUN},
81         {"SEAGATE", "ST296", "921", BLIST_NOLUN},       /* responds to all lun */
82         {"SEAGATE", "ST1581", "6538", BLIST_NOLUN},     /* responds to all lun */
83         {"SONY", "CD-ROM CDU-541", "4.3d", BLIST_NOLUN},
84         {"SONY", "CD-ROM CDU-55S", "1.0i", BLIST_NOLUN},
85         {"SONY", "CD-ROM CDU-561", "1.7x", BLIST_NOLUN},
86         {"SONY", "CD-ROM CDU-8012", NULL, BLIST_NOLUN},
87         {"SONY", "SDT-5000", "3.17", BLIST_SELECT_NO_ATN},
88         {"TANDBERG", "TDC 3600", "U07", BLIST_NOLUN},   /* locks up */
89         {"TEAC", "CD-R55S", "1.0H", BLIST_NOLUN},       /* locks up */
90         /*
91          * The following causes a failed REQUEST SENSE on lun 1 for
92          * seagate controller, which causes SCSI code to reset bus.
93          */
94         {"TEAC", "CD-ROM", "1.06", BLIST_NOLUN},
95         {"TEAC", "MT-2ST/45S2-27", "RV M", BLIST_NOLUN},        /* responds to all lun */
96         /*
97          * The following causes a failed REQUEST SENSE on lun 1 for
98          * seagate controller, which causes SCSI code to reset bus.
99          */
100         {"HP", "C1750A", "3226", BLIST_NOLUN},          /* scanjet iic */
101         {"HP", "C1790A", "", BLIST_NOLUN},              /* scanjet iip */
102         {"HP", "C2500A", "", BLIST_NOLUN},              /* scanjet iicx */
103         {"MEDIAVIS", "CDR-H93MV", "1.31", BLIST_NOLUN}, /* locks up */
104         {"MICROTEK", "ScanMaker II", "5.61", BLIST_NOLUN},      /* responds to all lun */
105         {"MITSUMI", "CD-R CR-2201CS", "6119", BLIST_NOLUN},     /* locks up */
106         {"NEC", "D3856", "0009", BLIST_NOLUN},
107         {"QUANTUM", "LPS525S", "3110", BLIST_NOLUN},    /* locks up */
108         {"QUANTUM", "PD1225S", "3110", BLIST_NOLUN},    /* locks up */
109         {"QUANTUM", "FIREBALL ST4.3S", "0F0C", BLIST_NOLUN},    /* locks up */
110         {"RELISYS", "Scorpio", NULL, BLIST_NOLUN},      /* responds to all lun */
111         {"SANKYO", "CP525", "6.64", BLIST_NOLUN},       /* causes failed REQ SENSE, extra reset */
112         {"TEXEL", "CD-ROM", "1.06", BLIST_NOLUN},
113         {"YAMAHA", "CDR100", "1.00", BLIST_NOLUN},      /* locks up */
114         {"YAMAHA", "CDR102", "1.00", BLIST_NOLUN},      /* locks up */
115         {"YAMAHA", "CRW8424S", "1.0", BLIST_NOLUN},     /* locks up */
116         {"YAMAHA", "CRW6416S", "1.0c", BLIST_NOLUN},    /* locks up */
117         {"", "Scanner", "1.80", BLIST_NOLUN},   /* responds to all lun */
118
119         /*
120          * Other types of devices that have special flags.
121          * Note that all USB devices should have the BLIST_INQUIRY_36 flag.
122          */
123         {"3PARdata", "VV", NULL, BLIST_REPORTLUN2},
124         {"ADAPTEC", "AACRAID", NULL, BLIST_FORCELUN},
125         {"ADAPTEC", "Adaptec 5400S", NULL, BLIST_FORCELUN},
126         {"AFT PRO", "-IX CF", "0.0>", BLIST_FORCELUN},
127         {"BELKIN", "USB 2 HS-CF", "1.95",  BLIST_FORCELUN | BLIST_INQUIRY_36},
128         {"CANON", "IPUBJD", NULL, BLIST_SPARSELUN},
129         {"CBOX3", "USB Storage-SMC", "300A", BLIST_FORCELUN | BLIST_INQUIRY_36},
130         {"CMD", "CRA-7280", NULL, BLIST_SPARSELUN},     /* CMD RAID Controller */
131         {"CNSI", "G7324", NULL, BLIST_SPARSELUN},       /* Chaparral G7324 RAID */
132         {"CNSi", "G8324", NULL, BLIST_SPARSELUN},       /* Chaparral G8324 RAID */
133         {"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN},
134         {"COMPAQ", "CR3500", NULL, BLIST_FORCELUN},
135         {"COMPAQ", "MSA1000", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
136         {"COMPAQ", "MSA1000 VOLUME", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
137         {"COMPAQ", "HSV110", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
138         {"DDN", "SAN DataDirector", "*", BLIST_SPARSELUN},
139         {"DEC", "HSG80", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
140         {"DELL", "PV660F", NULL, BLIST_SPARSELUN},
141         {"DELL", "PV660F   PSEUDO", NULL, BLIST_SPARSELUN},
142         {"DELL", "PSEUDO DEVICE .", NULL, BLIST_SPARSELUN},     /* Dell PV 530F */
143         {"DELL", "PV530F", NULL, BLIST_SPARSELUN},
144         {"DELL", "PERCRAID", NULL, BLIST_FORCELUN},
145         {"DGC", "RAID", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, storage on LUN 0 */
146         {"DGC", "DISK", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, no storage on LUN 0 */
147         {"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN | BLIST_LARGELUN | BLIST_FORCELUN},
148         {"EMULEX", "MD21/S2     ESDI", NULL, BLIST_SINGLELUN},
149         {"FSC", "CentricStor", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
150         {"Generic", "USB SD Reader", "1.00", BLIST_FORCELUN | BLIST_INQUIRY_36},
151         {"Generic", "USB Storage-SMC", "0180", BLIST_FORCELUN | BLIST_INQUIRY_36},
152         {"Generic", "USB Storage-SMC", "0207", BLIST_FORCELUN | BLIST_INQUIRY_36},
153         {"HITACHI", "DF400", "*", BLIST_SPARSELUN},
154         {"HITACHI", "DF500", "*", BLIST_SPARSELUN},
155         {"HITACHI", "DF600", "*", BLIST_SPARSELUN},
156         {"HP", "A6189A", NULL, BLIST_SPARSELUN | BLIST_LARGELUN},       /* HP VA7400 */
157         {"HP", "OPEN-", "*", BLIST_SPARSELUN | BLIST_LARGELUN}, /* HP XP Arrays */
158         {"HP", "NetRAID-4M", NULL, BLIST_FORCELUN},
159         {"HP", "HSV100", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
160         {"HP", "C1557A", NULL, BLIST_FORCELUN},
161         {"HP", "C3323-300", "4269", BLIST_NOTQ},
162         {"IBM", "AuSaV1S2", NULL, BLIST_FORCELUN},
163         {"IBM", "ProFibre 4000R", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
164         {"IBM", "2105", NULL, BLIST_RETRY_HWERROR},
165         {"iomega", "jaz 1GB", "J.86", BLIST_NOTQ | BLIST_NOLUN},
166         {"IOMEGA", "Io20S         *F", NULL, BLIST_KEY},
167         {"INSITE", "Floptical   F*8I", NULL, BLIST_KEY},
168         {"INSITE", "I325VM", NULL, BLIST_KEY},
169         {"iRiver", "iFP Mass Driver", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
170         {"LASOUND", "CDX7405", "3.10", BLIST_MAX5LUN | BLIST_SINGLELUN},
171         {"MATSHITA", "PD-1", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
172         {"MATSHITA", "DMC-LC5", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
173         {"MATSHITA", "DMC-LC40", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
174         {"Medion", "Flash XL  MMC/SD", "2.6D", BLIST_FORCELUN},
175         {"MegaRAID", "LD", NULL, BLIST_FORCELUN},
176         {"MICROP", "4110", NULL, BLIST_NOTQ},
177         {"MYLEX", "DACARMRB", "*", BLIST_REPORTLUN2},
178         {"nCipher", "Fastness Crypto", NULL, BLIST_FORCELUN},
179         {"NAKAMICH", "MJ-4.8S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
180         {"NAKAMICH", "MJ-5.16S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
181         {"NEC", "PD-1 ODX654P", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
182         {"NRC", "MBR-7", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
183         {"NRC", "MBR-7.4", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
184         {"PIONEER", "CD-ROM DRM-600", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
185         {"PIONEER", "CD-ROM DRM-602X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
186         {"PIONEER", "CD-ROM DRM-604X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
187         {"REGAL", "CDC-4X", NULL, BLIST_MAX5LUN | BLIST_SINGLELUN},
188         {"SanDisk", "ImageMate CF-SD1", NULL, BLIST_FORCELUN},
189         {"SEAGATE", "ST34555N", "0930", BLIST_NOTQ},    /* Chokes on tagged INQUIRY */
190         {"SEAGATE", "ST3390N", "9546", BLIST_NOTQ},
191         {"SGI", "RAID3", "*", BLIST_SPARSELUN},
192         {"SGI", "RAID5", "*", BLIST_SPARSELUN},
193         {"SGI", "TP9100", "*", BLIST_REPORTLUN2},
194         {"SGI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
195         {"IBM", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
196         {"SMSC", "USB 2 HS-CF", NULL, BLIST_SPARSELUN | BLIST_INQUIRY_36},
197         {"SONY", "CD-ROM CDU-8001", NULL, BLIST_BORKEN},
198         {"SONY", "TSL", NULL, BLIST_FORCELUN},          /* DDS3 & DDS4 autoloaders */
199         {"ST650211", "CF", NULL, BLIST_RETRY_HWERROR},
200         {"SUN", "T300", "*", BLIST_SPARSELUN},
201         {"SUN", "T4", "*", BLIST_SPARSELUN},
202         {"TEXEL", "CD-ROM", "1.06", BLIST_BORKEN},
203         {"TOSHIBA", "CDROM", NULL, BLIST_ISROM},
204         {"TOSHIBA", "CD-ROM", NULL, BLIST_ISROM},
205         {"USB2.0", "SMARTMEDIA/XD", NULL, BLIST_FORCELUN | BLIST_INQUIRY_36},
206         {"WangDAT", "Model 2600", "01.7", BLIST_SELECT_NO_ATN},
207         {"WangDAT", "Model 3200", "02.2", BLIST_SELECT_NO_ATN},
208         {"WangDAT", "Model 1300", "02.4", BLIST_SELECT_NO_ATN},
209         {"WDC WD25", "00JB-00FUA0", NULL, BLIST_NOREPORTLUN},
210         {"XYRATEX", "RS", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
211         {"Zzyzx", "RocketStor 500S", NULL, BLIST_SPARSELUN},
212         {"Zzyzx", "RocketStor 2000", NULL, BLIST_SPARSELUN},
213         { NULL, NULL, NULL, 0 },
214 };
215
216 /*
217  * scsi_strcpy_devinfo: called from scsi_dev_info_list_add to copy into
218  * devinfo vendor and model strings.
219  */
220 static void scsi_strcpy_devinfo(char *name, char *to, size_t to_length,
221                                 char *from, int compatible)
222 {
223         size_t from_length;
224
225         from_length = strlen(from);
226         strncpy(to, from, min(to_length, from_length));
227         if (from_length < to_length) {
228                 if (compatible) {
229                         /*
230                          * NUL terminate the string if it is short.
231                          */
232                         to[from_length] = '\0';
233                 } else {
234                         /* 
235                          * space pad the string if it is short. 
236                          */
237                         strncpy(&to[from_length], spaces,
238                                 to_length - from_length);
239                 }
240         }
241         if (from_length > to_length)
242                  printk(KERN_WARNING "%s: %s string '%s' is too long\n",
243                         __FUNCTION__, name, from);
244 }
245
246 /**
247  * scsi_dev_info_list_add: add one dev_info list entry.
248  * @vendor:     vendor string
249  * @model:      model (product) string
250  * @strflags:   integer string
251  * @flag:       if strflags NULL, use this flag value
252  *
253  * Description:
254  *      Create and add one dev_info entry for @vendor, @model, @strflags or
255  *      @flag. If @compatible, add to the tail of the list, do not space
256  *      pad, and set devinfo->compatible. The scsi_static_device_list entries
257  *      are added with @compatible 1 and @clfags NULL.
258  *
259  * Returns: 0 OK, -error on failure.
260  **/
261 static int scsi_dev_info_list_add(int compatible, char *vendor, char *model,
262                             char *strflags, int flags)
263 {
264         struct scsi_dev_info_list *devinfo;
265
266         devinfo = kmalloc(sizeof(*devinfo), GFP_KERNEL);
267         if (!devinfo) {
268                 printk(KERN_ERR "%s: no memory\n", __FUNCTION__);
269                 return -ENOMEM;
270         }
271
272         scsi_strcpy_devinfo("vendor", devinfo->vendor, sizeof(devinfo->vendor),
273                             vendor, compatible);
274         scsi_strcpy_devinfo("model", devinfo->model, sizeof(devinfo->model),
275                             model, compatible);
276
277         if (strflags)
278                 devinfo->flags = simple_strtoul(strflags, NULL, 0);
279         else
280                 devinfo->flags = flags;
281
282         devinfo->compatible = compatible;
283
284         if (compatible)
285                 list_add_tail(&devinfo->dev_info_list, &scsi_dev_info_list);
286         else
287                 list_add(&devinfo->dev_info_list, &scsi_dev_info_list);
288
289         return 0;
290 }
291
292 /**
293  * scsi_dev_info_list_add_str: parse dev_list and add to the
294  * scsi_dev_info_list.
295  * @dev_list:   string of device flags to add
296  *
297  * Description:
298  *      Parse dev_list, and add entries to the scsi_dev_info_list.
299  *      dev_list is of the form "vendor:product:flag,vendor:product:flag".
300  *      dev_list is modified via strsep. Can be called for command line
301  *      addition, for proc or mabye a sysfs interface.
302  *
303  * Returns: 0 if OK, -error on failure.
304  **/
305 static int scsi_dev_info_list_add_str(char *dev_list)
306 {
307         char *vendor, *model, *strflags, *next;
308         char *next_check;
309         int res = 0;
310
311         next = dev_list;
312         if (next && next[0] == '"') {
313                 /*
314                  * Ignore both the leading and trailing quote.
315                  */
316                 next++;
317                 next_check = ",\"";
318         } else {
319                 next_check = ",";
320         }
321
322         /*
323          * For the leading and trailing '"' case, the for loop comes
324          * through the last time with vendor[0] == '\0'.
325          */
326         for (vendor = strsep(&next, ":"); vendor && (vendor[0] != '\0')
327              && (res == 0); vendor = strsep(&next, ":")) {
328                 strflags = NULL;
329                 model = strsep(&next, ":");
330                 if (model)
331                         strflags = strsep(&next, next_check);
332                 if (!model || !strflags) {
333                         printk(KERN_ERR "%s: bad dev info string '%s' '%s'"
334                                " '%s'\n", __FUNCTION__, vendor, model,
335                                strflags);
336                         res = -EINVAL;
337                 } else
338                         res = scsi_dev_info_list_add(0 /* compatible */, vendor,
339                                                      model, strflags, 0);
340         }
341         return res;
342 }
343
344 /**
345  * get_device_flags - get device specific flags from the dynamic device
346  * list. Called during scan time.
347  * @vendor:     vendor name
348  * @model:      model name
349  *
350  * Description:
351  *     Search the scsi_dev_info_list for an entry matching @vendor and
352  *     @model, if found, return the matching flags value, else return
353  *     the host or global default settings.
354  **/
355 int scsi_get_device_flags(struct scsi_device *sdev, unsigned char *vendor,
356                           unsigned char *model)
357 {
358         struct scsi_dev_info_list *devinfo;
359         unsigned int bflags;
360
361         bflags = sdev->sdev_bflags;
362         if (!bflags)
363                 bflags = scsi_default_dev_flags;
364
365         list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
366                 if (devinfo->compatible) {
367                         /*
368                          * Behave like the older version of get_device_flags.
369                          */
370                         size_t max;
371                         /*
372                          * XXX why skip leading spaces? If an odd INQUIRY
373                          * value, that should have been part of the
374                          * scsi_static_device_list[] entry, such as "  FOO"
375                          * rather than "FOO". Since this code is already
376                          * here, and we don't know what device it is
377                          * trying to work with, leave it as-is.
378                          */
379                         max = 8;        /* max length of vendor */
380                         while ((max > 0) && *vendor == ' ') {
381                                 max--;
382                                 vendor++;
383                         }
384                         /*
385                          * XXX removing the following strlen() would be
386                          * good, using it means that for a an entry not in
387                          * the list, we scan every byte of every vendor
388                          * listed in scsi_static_device_list[], and never match
389                          * a single one (and still have to compare at
390                          * least the first byte of each vendor).
391                          */
392                         if (memcmp(devinfo->vendor, vendor,
393                                     min(max, strlen(devinfo->vendor))))
394                                 continue;
395                         /*
396                          * Skip spaces again.
397                          */
398                         max = 16;       /* max length of model */
399                         while ((max > 0) && *model == ' ') {
400                                 max--;
401                                 model++;
402                         }
403                         if (memcmp(devinfo->model, model,
404                                    min(max, strlen(devinfo->model))))
405                                 continue;
406                         return devinfo->flags;
407                 } else {
408                         if (!memcmp(devinfo->vendor, vendor,
409                                      sizeof(devinfo->vendor)) &&
410                              !memcmp(devinfo->model, model,
411                                       sizeof(devinfo->model)))
412                                 return devinfo->flags;
413                 }
414         }
415         return bflags;
416 }
417
418 #ifdef CONFIG_SCSI_PROC_FS
419 /* 
420  * proc_scsi_dev_info_read: dump the scsi_dev_info_list via
421  * /proc/scsi/device_info
422  */
423 static int proc_scsi_devinfo_read(char *buffer, char **start,
424                                   off_t offset, int length)
425 {
426         struct scsi_dev_info_list *devinfo;
427         int size, len = 0;
428         off_t begin = 0;
429         off_t pos = 0;
430
431         list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
432                 size = sprintf(buffer + len, "'%.8s' '%.16s' 0x%x\n",
433                         devinfo->vendor, devinfo->model, devinfo->flags);
434                 len += size;
435                 pos = begin + len;
436                 if (pos < offset) {
437                         len = 0;
438                         begin = pos;
439                 }
440                 if (pos > offset + length)
441                         goto stop_output;
442         }
443
444 stop_output:
445         *start = buffer + (offset - begin);     /* Start of wanted data */
446         len -= (offset - begin);        /* Start slop */
447         if (len > length)
448                 len = length;   /* Ending slop */
449         return (len);
450 }
451
452 /* 
453  * proc_scsi_dev_info_write: allow additions to the scsi_dev_info_list via
454  * /proc.
455  *
456  * Use: echo "vendor:model:flag" > /proc/scsi/device_info
457  *
458  * To add a black/white list entry for vendor and model with an integer
459  * value of flag to the scsi device info list.
460  */
461 static int proc_scsi_devinfo_write(struct file *file, const char __user *buf,
462                                    unsigned long length, void *data)
463 {
464         char *buffer;
465         int err = length;
466
467         if (!buf || length>PAGE_SIZE)
468                 return -EINVAL;
469         if (!(buffer = (char *) __get_free_page(GFP_KERNEL)))
470                 return -ENOMEM;
471         if (copy_from_user(buffer, buf, length)) {
472                 err =-EFAULT;
473                 goto out;
474         }
475
476         if (length < PAGE_SIZE)
477                 buffer[length] = '\0';
478         else if (buffer[PAGE_SIZE-1]) {
479                 err = -EINVAL;
480                 goto out;
481         }
482
483         scsi_dev_info_list_add_str(buffer);
484
485 out:
486         free_page((unsigned long)buffer);
487         return err;
488 }
489 #endif /* CONFIG_SCSI_PROC_FS */
490
491 module_param_string(dev_flags, scsi_dev_flags, sizeof(scsi_dev_flags), 0);
492 MODULE_PARM_DESC(dev_flags,
493          "Given scsi_dev_flags=vendor:model:flags[,v:m:f] add black/white"
494          " list entries for vendor and model with an integer value of flags"
495          " to the scsi device info list");
496
497 module_param_named(default_dev_flags, scsi_default_dev_flags, int, S_IRUGO|S_IWUSR);
498 MODULE_PARM_DESC(default_dev_flags,
499                  "scsi default device flag integer value");
500
501 /**
502  * scsi_dev_info_list_delete: called from scsi.c:exit_scsi to remove
503  *      the scsi_dev_info_list.
504  **/
505 void scsi_exit_devinfo(void)
506 {
507         struct list_head *lh, *lh_next;
508         struct scsi_dev_info_list *devinfo;
509
510 #ifdef CONFIG_SCSI_PROC_FS
511         remove_proc_entry("scsi/device_info", NULL);
512 #endif
513
514         list_for_each_safe(lh, lh_next, &scsi_dev_info_list) {
515                 devinfo = list_entry(lh, struct scsi_dev_info_list,
516                                      dev_info_list);
517                 kfree(devinfo);
518         }
519 }
520
521 /**
522  * scsi_dev_list_init: set up the dynamic device list.
523  * @dev_list:   string of device flags to add
524  *
525  * Description:
526  *      Add command line @dev_list entries, then add
527  *      scsi_static_device_list entries to the scsi device info list.
528  **/
529 int __init scsi_init_devinfo(void)
530 {
531 #ifdef CONFIG_SCSI_PROC_FS
532         struct proc_dir_entry *p;
533 #endif
534         int error, i;
535
536         error = scsi_dev_info_list_add_str(scsi_dev_flags);
537         if (error)
538                 return error;
539
540         for (i = 0; scsi_static_device_list[i].vendor; i++) {
541                 error = scsi_dev_info_list_add(1 /* compatibile */,
542                                 scsi_static_device_list[i].vendor,
543                                 scsi_static_device_list[i].model,
544                                 NULL,
545                                 scsi_static_device_list[i].flags);
546                 if (error)
547                         goto out;
548         }
549
550 #ifdef CONFIG_SCSI_PROC_FS
551         p = create_proc_entry("scsi/device_info", 0, NULL);
552         if (!p) {
553                 error = -ENOMEM;
554                 goto out;
555         }
556
557         p->owner = THIS_MODULE;
558         p->get_info = proc_scsi_devinfo_read;
559         p->write_proc = proc_scsi_devinfo_write;
560 #endif /* CONFIG_SCSI_PROC_FS */
561
562  out:
563         if (error)
564                 scsi_exit_devinfo();
565         return error;
566 }