Merge branch 'master'
[linux-2.6.git] / 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         {"transtec", "T5008", "0001", BLIST_NOREPORTLUN },
114         {"YAMAHA", "CDR100", "1.00", BLIST_NOLUN},      /* locks up */
115         {"YAMAHA", "CDR102", "1.00", BLIST_NOLUN},      /* locks up */
116         {"YAMAHA", "CRW8424S", "1.0", BLIST_NOLUN},     /* locks up */
117         {"YAMAHA", "CRW6416S", "1.0c", BLIST_NOLUN},    /* locks up */
118         {"", "Scanner", "1.80", BLIST_NOLUN},   /* responds to all lun */
119
120         /*
121          * Other types of devices that have special flags.
122          * Note that all USB devices should have the BLIST_INQUIRY_36 flag.
123          */
124         {"3PARdata", "VV", NULL, BLIST_REPORTLUN2},
125         {"ADAPTEC", "AACRAID", NULL, BLIST_FORCELUN},
126         {"ADAPTEC", "Adaptec 5400S", NULL, BLIST_FORCELUN},
127         {"AFT PRO", "-IX CF", "0.0>", BLIST_FORCELUN},
128         {"BELKIN", "USB 2 HS-CF", "1.95",  BLIST_FORCELUN | BLIST_INQUIRY_36},
129         {"BROWNIE", "1600U3P", NULL, BLIST_NOREPORTLUN},
130         {"CANON", "IPUBJD", NULL, BLIST_SPARSELUN},
131         {"CBOX3", "USB Storage-SMC", "300A", BLIST_FORCELUN | BLIST_INQUIRY_36},
132         {"CMD", "CRA-7280", NULL, BLIST_SPARSELUN},     /* CMD RAID Controller */
133         {"CNSI", "G7324", NULL, BLIST_SPARSELUN},       /* Chaparral G7324 RAID */
134         {"CNSi", "G8324", NULL, BLIST_SPARSELUN},       /* Chaparral G8324 RAID */
135         {"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN},
136         {"COMPAQ", "CR3500", NULL, BLIST_FORCELUN},
137         {"COMPAQ", "MSA1000", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
138         {"COMPAQ", "MSA1000 VOLUME", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
139         {"COMPAQ", "HSV110", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
140         {"DDN", "SAN DataDirector", "*", BLIST_SPARSELUN},
141         {"DEC", "HSG80", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
142         {"DELL", "PV660F", NULL, BLIST_SPARSELUN},
143         {"DELL", "PV660F   PSEUDO", NULL, BLIST_SPARSELUN},
144         {"DELL", "PSEUDO DEVICE .", NULL, BLIST_SPARSELUN},     /* Dell PV 530F */
145         {"DELL", "PV530F", NULL, BLIST_SPARSELUN},
146         {"DELL", "PERCRAID", NULL, BLIST_FORCELUN},
147         {"DGC", "RAID", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, storage on LUN 0 */
148         {"DGC", "DISK", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, no storage on LUN 0 */
149         {"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN | BLIST_LARGELUN | BLIST_FORCELUN},
150         {"EMULEX", "MD21/S2     ESDI", NULL, BLIST_SINGLELUN},
151         {"FSC", "CentricStor", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
152         {"Generic", "USB SD Reader", "1.00", BLIST_FORCELUN | BLIST_INQUIRY_36},
153         {"Generic", "USB Storage-SMC", "0180", BLIST_FORCELUN | BLIST_INQUIRY_36},
154         {"Generic", "USB Storage-SMC", "0207", BLIST_FORCELUN | BLIST_INQUIRY_36},
155         {"HITACHI", "DF400", "*", BLIST_SPARSELUN},
156         {"HITACHI", "DF500", "*", BLIST_SPARSELUN},
157         {"HITACHI", "DF600", "*", BLIST_SPARSELUN},
158         {"HP", "A6189A", NULL, BLIST_SPARSELUN | BLIST_LARGELUN},       /* HP VA7400 */
159         {"HP", "OPEN-", "*", BLIST_SPARSELUN | BLIST_LARGELUN}, /* HP XP Arrays */
160         {"HP", "NetRAID-4M", NULL, BLIST_FORCELUN},
161         {"HP", "HSV100", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
162         {"HP", "C1557A", NULL, BLIST_FORCELUN},
163         {"HP", "C3323-300", "4269", BLIST_NOTQ},
164         {"IBM", "AuSaV1S2", NULL, BLIST_FORCELUN},
165         {"IBM", "ProFibre 4000R", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
166         {"IBM", "2105", NULL, BLIST_RETRY_HWERROR},
167         {"iomega", "jaz 1GB", "J.86", BLIST_NOTQ | BLIST_NOLUN},
168         {"IOMEGA", "Io20S         *F", NULL, BLIST_KEY},
169         {"INSITE", "Floptical   F*8I", NULL, BLIST_KEY},
170         {"INSITE", "I325VM", NULL, BLIST_KEY},
171         {"iRiver", "iFP Mass Driver", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
172         {"LASOUND", "CDX7405", "3.10", BLIST_MAX5LUN | BLIST_SINGLELUN},
173         {"MATSHITA", "PD-1", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
174         {"MATSHITA", "DMC-LC5", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
175         {"MATSHITA", "DMC-LC40", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
176         {"Medion", "Flash XL  MMC/SD", "2.6D", BLIST_FORCELUN},
177         {"MegaRAID", "LD", NULL, BLIST_FORCELUN},
178         {"MICROP", "4110", NULL, BLIST_NOTQ},
179         {"MYLEX", "DACARMRB", "*", BLIST_REPORTLUN2},
180         {"nCipher", "Fastness Crypto", NULL, BLIST_FORCELUN},
181         {"NAKAMICH", "MJ-4.8S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
182         {"NAKAMICH", "MJ-5.16S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
183         {"NEC", "PD-1 ODX654P", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
184         {"NRC", "MBR-7", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
185         {"NRC", "MBR-7.4", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
186         {"PIONEER", "CD-ROM DRM-600", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
187         {"PIONEER", "CD-ROM DRM-602X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
188         {"PIONEER", "CD-ROM DRM-604X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
189         {"PIONEER", "CD-ROM DRM-624X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
190         {"REGAL", "CDC-4X", NULL, BLIST_MAX5LUN | BLIST_SINGLELUN},
191         {"SanDisk", "ImageMate CF-SD1", NULL, BLIST_FORCELUN},
192         {"SEAGATE", "ST34555N", "0930", BLIST_NOTQ},    /* Chokes on tagged INQUIRY */
193         {"SEAGATE", "ST3390N", "9546", BLIST_NOTQ},
194         {"SGI", "RAID3", "*", BLIST_SPARSELUN},
195         {"SGI", "RAID5", "*", BLIST_SPARSELUN},
196         {"SGI", "TP9100", "*", BLIST_REPORTLUN2},
197         {"SGI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
198         {"IBM", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
199         {"SMSC", "USB 2 HS-CF", NULL, BLIST_SPARSELUN | BLIST_INQUIRY_36},
200         {"SONY", "CD-ROM CDU-8001", NULL, BLIST_BORKEN},
201         {"SONY", "TSL", NULL, BLIST_FORCELUN},          /* DDS3 & DDS4 autoloaders */
202         {"ST650211", "CF", NULL, BLIST_RETRY_HWERROR},
203         {"SUN", "T300", "*", BLIST_SPARSELUN},
204         {"SUN", "T4", "*", BLIST_SPARSELUN},
205         {"TEXEL", "CD-ROM", "1.06", BLIST_BORKEN},
206         {"TOSHIBA", "CDROM", NULL, BLIST_ISROM},
207         {"TOSHIBA", "CD-ROM", NULL, BLIST_ISROM},
208         {"USB2.0", "SMARTMEDIA/XD", NULL, BLIST_FORCELUN | BLIST_INQUIRY_36},
209         {"WangDAT", "Model 2600", "01.7", BLIST_SELECT_NO_ATN},
210         {"WangDAT", "Model 3200", "02.2", BLIST_SELECT_NO_ATN},
211         {"WangDAT", "Model 1300", "02.4", BLIST_SELECT_NO_ATN},
212         {"WDC WD25", "00JB-00FUA0", NULL, BLIST_NOREPORTLUN},
213         {"XYRATEX", "RS", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
214         {"Zzyzx", "RocketStor 500S", NULL, BLIST_SPARSELUN},
215         {"Zzyzx", "RocketStor 2000", NULL, BLIST_SPARSELUN},
216         { NULL, NULL, NULL, 0 },
217 };
218
219 /*
220  * scsi_strcpy_devinfo: called from scsi_dev_info_list_add to copy into
221  * devinfo vendor and model strings.
222  */
223 static void scsi_strcpy_devinfo(char *name, char *to, size_t to_length,
224                                 char *from, int compatible)
225 {
226         size_t from_length;
227
228         from_length = strlen(from);
229         strncpy(to, from, min(to_length, from_length));
230         if (from_length < to_length) {
231                 if (compatible) {
232                         /*
233                          * NUL terminate the string if it is short.
234                          */
235                         to[from_length] = '\0';
236                 } else {
237                         /* 
238                          * space pad the string if it is short. 
239                          */
240                         strncpy(&to[from_length], spaces,
241                                 to_length - from_length);
242                 }
243         }
244         if (from_length > to_length)
245                  printk(KERN_WARNING "%s: %s string '%s' is too long\n",
246                         __FUNCTION__, name, from);
247 }
248
249 /**
250  * scsi_dev_info_list_add: add one dev_info list entry.
251  * @vendor:     vendor string
252  * @model:      model (product) string
253  * @strflags:   integer string
254  * @flag:       if strflags NULL, use this flag value
255  *
256  * Description:
257  *      Create and add one dev_info entry for @vendor, @model, @strflags or
258  *      @flag. If @compatible, add to the tail of the list, do not space
259  *      pad, and set devinfo->compatible. The scsi_static_device_list entries
260  *      are added with @compatible 1 and @clfags NULL.
261  *
262  * Returns: 0 OK, -error on failure.
263  **/
264 static int scsi_dev_info_list_add(int compatible, char *vendor, char *model,
265                             char *strflags, int flags)
266 {
267         struct scsi_dev_info_list *devinfo;
268
269         devinfo = kmalloc(sizeof(*devinfo), GFP_KERNEL);
270         if (!devinfo) {
271                 printk(KERN_ERR "%s: no memory\n", __FUNCTION__);
272                 return -ENOMEM;
273         }
274
275         scsi_strcpy_devinfo("vendor", devinfo->vendor, sizeof(devinfo->vendor),
276                             vendor, compatible);
277         scsi_strcpy_devinfo("model", devinfo->model, sizeof(devinfo->model),
278                             model, compatible);
279
280         if (strflags)
281                 devinfo->flags = simple_strtoul(strflags, NULL, 0);
282         else
283                 devinfo->flags = flags;
284
285         devinfo->compatible = compatible;
286
287         if (compatible)
288                 list_add_tail(&devinfo->dev_info_list, &scsi_dev_info_list);
289         else
290                 list_add(&devinfo->dev_info_list, &scsi_dev_info_list);
291
292         return 0;
293 }
294
295 /**
296  * scsi_dev_info_list_add_str: parse dev_list and add to the
297  * scsi_dev_info_list.
298  * @dev_list:   string of device flags to add
299  *
300  * Description:
301  *      Parse dev_list, and add entries to the scsi_dev_info_list.
302  *      dev_list is of the form "vendor:product:flag,vendor:product:flag".
303  *      dev_list is modified via strsep. Can be called for command line
304  *      addition, for proc or mabye a sysfs interface.
305  *
306  * Returns: 0 if OK, -error on failure.
307  **/
308 static int scsi_dev_info_list_add_str(char *dev_list)
309 {
310         char *vendor, *model, *strflags, *next;
311         char *next_check;
312         int res = 0;
313
314         next = dev_list;
315         if (next && next[0] == '"') {
316                 /*
317                  * Ignore both the leading and trailing quote.
318                  */
319                 next++;
320                 next_check = ",\"";
321         } else {
322                 next_check = ",";
323         }
324
325         /*
326          * For the leading and trailing '"' case, the for loop comes
327          * through the last time with vendor[0] == '\0'.
328          */
329         for (vendor = strsep(&next, ":"); vendor && (vendor[0] != '\0')
330              && (res == 0); vendor = strsep(&next, ":")) {
331                 strflags = NULL;
332                 model = strsep(&next, ":");
333                 if (model)
334                         strflags = strsep(&next, next_check);
335                 if (!model || !strflags) {
336                         printk(KERN_ERR "%s: bad dev info string '%s' '%s'"
337                                " '%s'\n", __FUNCTION__, vendor, model,
338                                strflags);
339                         res = -EINVAL;
340                 } else
341                         res = scsi_dev_info_list_add(0 /* compatible */, vendor,
342                                                      model, strflags, 0);
343         }
344         return res;
345 }
346
347 /**
348  * get_device_flags - get device specific flags from the dynamic device
349  * list. Called during scan time.
350  * @vendor:     vendor name
351  * @model:      model name
352  *
353  * Description:
354  *     Search the scsi_dev_info_list for an entry matching @vendor and
355  *     @model, if found, return the matching flags value, else return
356  *     the host or global default settings.
357  **/
358 int scsi_get_device_flags(struct scsi_device *sdev,
359                           const unsigned char *vendor,
360                           const unsigned char *model)
361 {
362         struct scsi_dev_info_list *devinfo;
363         unsigned int bflags;
364
365         bflags = sdev->sdev_bflags;
366         if (!bflags)
367                 bflags = scsi_default_dev_flags;
368
369         list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
370                 if (devinfo->compatible) {
371                         /*
372                          * Behave like the older version of get_device_flags.
373                          */
374                         size_t max;
375                         /*
376                          * XXX why skip leading spaces? If an odd INQUIRY
377                          * value, that should have been part of the
378                          * scsi_static_device_list[] entry, such as "  FOO"
379                          * rather than "FOO". Since this code is already
380                          * here, and we don't know what device it is
381                          * trying to work with, leave it as-is.
382                          */
383                         max = 8;        /* max length of vendor */
384                         while ((max > 0) && *vendor == ' ') {
385                                 max--;
386                                 vendor++;
387                         }
388                         /*
389                          * XXX removing the following strlen() would be
390                          * good, using it means that for a an entry not in
391                          * the list, we scan every byte of every vendor
392                          * listed in scsi_static_device_list[], and never match
393                          * a single one (and still have to compare at
394                          * least the first byte of each vendor).
395                          */
396                         if (memcmp(devinfo->vendor, vendor,
397                                     min(max, strlen(devinfo->vendor))))
398                                 continue;
399                         /*
400                          * Skip spaces again.
401                          */
402                         max = 16;       /* max length of model */
403                         while ((max > 0) && *model == ' ') {
404                                 max--;
405                                 model++;
406                         }
407                         if (memcmp(devinfo->model, model,
408                                    min(max, strlen(devinfo->model))))
409                                 continue;
410                         return devinfo->flags;
411                 } else {
412                         if (!memcmp(devinfo->vendor, vendor,
413                                      sizeof(devinfo->vendor)) &&
414                              !memcmp(devinfo->model, model,
415                                       sizeof(devinfo->model)))
416                                 return devinfo->flags;
417                 }
418         }
419         return bflags;
420 }
421
422 #ifdef CONFIG_SCSI_PROC_FS
423 /* 
424  * proc_scsi_dev_info_read: dump the scsi_dev_info_list via
425  * /proc/scsi/device_info
426  */
427 static int proc_scsi_devinfo_read(char *buffer, char **start,
428                                   off_t offset, int length)
429 {
430         struct scsi_dev_info_list *devinfo;
431         int size, len = 0;
432         off_t begin = 0;
433         off_t pos = 0;
434
435         list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
436                 size = sprintf(buffer + len, "'%.8s' '%.16s' 0x%x\n",
437                         devinfo->vendor, devinfo->model, devinfo->flags);
438                 len += size;
439                 pos = begin + len;
440                 if (pos < offset) {
441                         len = 0;
442                         begin = pos;
443                 }
444                 if (pos > offset + length)
445                         goto stop_output;
446         }
447
448 stop_output:
449         *start = buffer + (offset - begin);     /* Start of wanted data */
450         len -= (offset - begin);        /* Start slop */
451         if (len > length)
452                 len = length;   /* Ending slop */
453         return (len);
454 }
455
456 /* 
457  * proc_scsi_dev_info_write: allow additions to the scsi_dev_info_list via
458  * /proc.
459  *
460  * Use: echo "vendor:model:flag" > /proc/scsi/device_info
461  *
462  * To add a black/white list entry for vendor and model with an integer
463  * value of flag to the scsi device info list.
464  */
465 static int proc_scsi_devinfo_write(struct file *file, const char __user *buf,
466                                    unsigned long length, void *data)
467 {
468         char *buffer;
469         int err = length;
470
471         if (!buf || length>PAGE_SIZE)
472                 return -EINVAL;
473         if (!(buffer = (char *) __get_free_page(GFP_KERNEL)))
474                 return -ENOMEM;
475         if (copy_from_user(buffer, buf, length)) {
476                 err =-EFAULT;
477                 goto out;
478         }
479
480         if (length < PAGE_SIZE)
481                 buffer[length] = '\0';
482         else if (buffer[PAGE_SIZE-1]) {
483                 err = -EINVAL;
484                 goto out;
485         }
486
487         scsi_dev_info_list_add_str(buffer);
488
489 out:
490         free_page((unsigned long)buffer);
491         return err;
492 }
493 #endif /* CONFIG_SCSI_PROC_FS */
494
495 module_param_string(dev_flags, scsi_dev_flags, sizeof(scsi_dev_flags), 0);
496 MODULE_PARM_DESC(dev_flags,
497          "Given scsi_dev_flags=vendor:model:flags[,v:m:f] add black/white"
498          " list entries for vendor and model with an integer value of flags"
499          " to the scsi device info list");
500
501 module_param_named(default_dev_flags, scsi_default_dev_flags, int, S_IRUGO|S_IWUSR);
502 MODULE_PARM_DESC(default_dev_flags,
503                  "scsi default device flag integer value");
504
505 /**
506  * scsi_dev_info_list_delete: called from scsi.c:exit_scsi to remove
507  *      the scsi_dev_info_list.
508  **/
509 void scsi_exit_devinfo(void)
510 {
511         struct list_head *lh, *lh_next;
512         struct scsi_dev_info_list *devinfo;
513
514 #ifdef CONFIG_SCSI_PROC_FS
515         remove_proc_entry("scsi/device_info", NULL);
516 #endif
517
518         list_for_each_safe(lh, lh_next, &scsi_dev_info_list) {
519                 devinfo = list_entry(lh, struct scsi_dev_info_list,
520                                      dev_info_list);
521                 kfree(devinfo);
522         }
523 }
524
525 /**
526  * scsi_dev_list_init: set up the dynamic device list.
527  * @dev_list:   string of device flags to add
528  *
529  * Description:
530  *      Add command line @dev_list entries, then add
531  *      scsi_static_device_list entries to the scsi device info list.
532  **/
533 int __init scsi_init_devinfo(void)
534 {
535 #ifdef CONFIG_SCSI_PROC_FS
536         struct proc_dir_entry *p;
537 #endif
538         int error, i;
539
540         error = scsi_dev_info_list_add_str(scsi_dev_flags);
541         if (error)
542                 return error;
543
544         for (i = 0; scsi_static_device_list[i].vendor; i++) {
545                 error = scsi_dev_info_list_add(1 /* compatibile */,
546                                 scsi_static_device_list[i].vendor,
547                                 scsi_static_device_list[i].model,
548                                 NULL,
549                                 scsi_static_device_list[i].flags);
550                 if (error)
551                         goto out;
552         }
553
554 #ifdef CONFIG_SCSI_PROC_FS
555         p = create_proc_entry("scsi/device_info", 0, NULL);
556         if (!p) {
557                 error = -ENOMEM;
558                 goto out;
559         }
560
561         p->owner = THIS_MODULE;
562         p->get_info = proc_scsi_devinfo_read;
563         p->write_proc = proc_scsi_devinfo_write;
564 #endif /* CONFIG_SCSI_PROC_FS */
565
566  out:
567         if (error)
568                 scsi_exit_devinfo();
569         return error;
570 }