sg.c 70 KB

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  1. /*
  2. * History:
  3. * Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
  4. * to allow user process control of SCSI devices.
  5. * Development Sponsored by Killy Corp. NY NY
  6. *
  7. * Original driver (sg.c):
  8. * Copyright (C) 1992 Lawrence Foard
  9. * Version 2 and 3 extensions to driver:
  10. * Copyright (C) 1998 - 2005 Douglas Gilbert
  11. *
  12. * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
  13. *
  14. * This program is free software; you can redistribute it and/or modify
  15. * it under the terms of the GNU General Public License as published by
  16. * the Free Software Foundation; either version 2, or (at your option)
  17. * any later version.
  18. *
  19. */
  20. static int sg_version_num = 30534; /* 2 digits for each component */
  21. #define SG_VERSION_STR "3.5.34"
  22. /*
  23. * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
  24. * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
  25. * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
  26. * (otherwise the macros compile to empty statements).
  27. *
  28. */
  29. #include <linux/module.h>
  30. #include <linux/fs.h>
  31. #include <linux/kernel.h>
  32. #include <linux/sched.h>
  33. #include <linux/string.h>
  34. #include <linux/mm.h>
  35. #include <linux/errno.h>
  36. #include <linux/mtio.h>
  37. #include <linux/ioctl.h>
  38. #include <linux/slab.h>
  39. #include <linux/fcntl.h>
  40. #include <linux/init.h>
  41. #include <linux/poll.h>
  42. #include <linux/moduleparam.h>
  43. #include <linux/cdev.h>
  44. #include <linux/idr.h>
  45. #include <linux/seq_file.h>
  46. #include <linux/blkdev.h>
  47. #include <linux/delay.h>
  48. #include <linux/blktrace_api.h>
  49. #include <linux/smp_lock.h>
  50. #include "scsi.h"
  51. #include <scsi/scsi_dbg.h>
  52. #include <scsi/scsi_host.h>
  53. #include <scsi/scsi_driver.h>
  54. #include <scsi/scsi_ioctl.h>
  55. #include <scsi/sg.h>
  56. #include "scsi_logging.h"
  57. #ifdef CONFIG_SCSI_PROC_FS
  58. #include <linux/proc_fs.h>
  59. static char *sg_version_date = "20061027";
  60. static int sg_proc_init(void);
  61. static void sg_proc_cleanup(void);
  62. #endif
  63. #define SG_ALLOW_DIO_DEF 0
  64. #define SG_MAX_DEVS 32768
  65. /*
  66. * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
  67. * Then when using 32 bit integers x * m may overflow during the calculation.
  68. * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
  69. * calculates the same, but prevents the overflow when both m and d
  70. * are "small" numbers (like HZ and USER_HZ).
  71. * Of course an overflow is inavoidable if the result of muldiv doesn't fit
  72. * in 32 bits.
  73. */
  74. #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
  75. #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
  76. int sg_big_buff = SG_DEF_RESERVED_SIZE;
  77. /* N.B. This variable is readable and writeable via
  78. /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
  79. of this size (or less if there is not enough memory) will be reserved
  80. for use by this file descriptor. [Deprecated usage: this variable is also
  81. readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
  82. the kernel (i.e. it is not a module).] */
  83. static int def_reserved_size = -1; /* picks up init parameter */
  84. static int sg_allow_dio = SG_ALLOW_DIO_DEF;
  85. static int scatter_elem_sz = SG_SCATTER_SZ;
  86. static int scatter_elem_sz_prev = SG_SCATTER_SZ;
  87. #define SG_SECTOR_SZ 512
  88. static int sg_add(struct device *, struct class_interface *);
  89. static void sg_remove(struct device *, struct class_interface *);
  90. static DEFINE_IDR(sg_index_idr);
  91. static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
  92. file descriptor list for device */
  93. static struct class_interface sg_interface = {
  94. .add_dev = sg_add,
  95. .remove_dev = sg_remove,
  96. };
  97. typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
  98. unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
  99. unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
  100. unsigned bufflen; /* Size of (aggregate) data buffer */
  101. struct page **pages;
  102. int page_order;
  103. char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
  104. unsigned char cmd_opcode; /* first byte of command */
  105. } Sg_scatter_hold;
  106. struct sg_device; /* forward declarations */
  107. struct sg_fd;
  108. typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
  109. struct sg_request *nextrp; /* NULL -> tail request (slist) */
  110. struct sg_fd *parentfp; /* NULL -> not in use */
  111. Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
  112. sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
  113. unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
  114. char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
  115. char orphan; /* 1 -> drop on sight, 0 -> normal */
  116. char sg_io_owned; /* 1 -> packet belongs to SG_IO */
  117. volatile char done; /* 0->before bh, 1->before read, 2->read */
  118. struct request *rq;
  119. struct bio *bio;
  120. struct execute_work ew;
  121. } Sg_request;
  122. typedef struct sg_fd { /* holds the state of a file descriptor */
  123. struct list_head sfd_siblings;
  124. struct sg_device *parentdp; /* owning device */
  125. wait_queue_head_t read_wait; /* queue read until command done */
  126. rwlock_t rq_list_lock; /* protect access to list in req_arr */
  127. int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
  128. int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
  129. Sg_scatter_hold reserve; /* buffer held for this file descriptor */
  130. unsigned save_scat_len; /* original length of trunc. scat. element */
  131. Sg_request *headrp; /* head of request slist, NULL->empty */
  132. struct fasync_struct *async_qp; /* used by asynchronous notification */
  133. Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
  134. char low_dma; /* as in parent but possibly overridden to 1 */
  135. char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
  136. volatile char closed; /* 1 -> fd closed but request(s) outstanding */
  137. char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
  138. char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
  139. char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
  140. char mmap_called; /* 0 -> mmap() never called on this fd */
  141. struct kref f_ref;
  142. struct execute_work ew;
  143. } Sg_fd;
  144. typedef struct sg_device { /* holds the state of each scsi generic device */
  145. struct scsi_device *device;
  146. wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
  147. int sg_tablesize; /* adapter's max scatter-gather table size */
  148. u32 index; /* device index number */
  149. struct list_head sfds;
  150. volatile char detached; /* 0->attached, 1->detached pending removal */
  151. volatile char exclude; /* opened for exclusive access */
  152. char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
  153. struct gendisk *disk;
  154. struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
  155. struct kref d_ref;
  156. } Sg_device;
  157. /* tasklet or soft irq callback */
  158. static void sg_rq_end_io(struct request *rq, int uptodate);
  159. static int sg_start_req(Sg_request *srp, unsigned char *cmd);
  160. static int sg_finish_rem_req(Sg_request * srp);
  161. static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
  162. static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
  163. Sg_request * srp);
  164. static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
  165. const char __user *buf, size_t count, int blocking,
  166. int read_only, int sg_io_owned, Sg_request **o_srp);
  167. static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
  168. unsigned char *cmnd, int timeout, int blocking);
  169. static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
  170. static void sg_remove_scat(Sg_scatter_hold * schp);
  171. static void sg_build_reserve(Sg_fd * sfp, int req_size);
  172. static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
  173. static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
  174. static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
  175. static void sg_remove_sfp(struct kref *);
  176. static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
  177. static Sg_request *sg_add_request(Sg_fd * sfp);
  178. static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
  179. static int sg_res_in_use(Sg_fd * sfp);
  180. static Sg_device *sg_get_dev(int dev);
  181. static void sg_put_dev(Sg_device *sdp);
  182. #define SZ_SG_HEADER sizeof(struct sg_header)
  183. #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
  184. #define SZ_SG_IOVEC sizeof(sg_iovec_t)
  185. #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
  186. static int sg_allow_access(struct file *filp, unsigned char *cmd)
  187. {
  188. struct sg_fd *sfp = (struct sg_fd *)filp->private_data;
  189. if (sfp->parentdp->device->type == TYPE_SCANNER)
  190. return 0;
  191. return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
  192. }
  193. static int
  194. sg_open(struct inode *inode, struct file *filp)
  195. {
  196. int dev = iminor(inode);
  197. int flags = filp->f_flags;
  198. struct request_queue *q;
  199. Sg_device *sdp;
  200. Sg_fd *sfp;
  201. int res;
  202. int retval;
  203. lock_kernel();
  204. nonseekable_open(inode, filp);
  205. SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
  206. sdp = sg_get_dev(dev);
  207. if (IS_ERR(sdp)) {
  208. retval = PTR_ERR(sdp);
  209. sdp = NULL;
  210. goto sg_put;
  211. }
  212. /* This driver's module count bumped by fops_get in <linux/fs.h> */
  213. /* Prevent the device driver from vanishing while we sleep */
  214. retval = scsi_device_get(sdp->device);
  215. if (retval)
  216. goto sg_put;
  217. if (!((flags & O_NONBLOCK) ||
  218. scsi_block_when_processing_errors(sdp->device))) {
  219. retval = -ENXIO;
  220. /* we are in error recovery for this device */
  221. goto error_out;
  222. }
  223. if (flags & O_EXCL) {
  224. if (O_RDONLY == (flags & O_ACCMODE)) {
  225. retval = -EPERM; /* Can't lock it with read only access */
  226. goto error_out;
  227. }
  228. if (!list_empty(&sdp->sfds) && (flags & O_NONBLOCK)) {
  229. retval = -EBUSY;
  230. goto error_out;
  231. }
  232. res = 0;
  233. __wait_event_interruptible(sdp->o_excl_wait,
  234. ((!list_empty(&sdp->sfds) || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
  235. if (res) {
  236. retval = res; /* -ERESTARTSYS because signal hit process */
  237. goto error_out;
  238. }
  239. } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
  240. if (flags & O_NONBLOCK) {
  241. retval = -EBUSY;
  242. goto error_out;
  243. }
  244. res = 0;
  245. __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
  246. res);
  247. if (res) {
  248. retval = res; /* -ERESTARTSYS because signal hit process */
  249. goto error_out;
  250. }
  251. }
  252. if (sdp->detached) {
  253. retval = -ENODEV;
  254. goto error_out;
  255. }
  256. if (list_empty(&sdp->sfds)) { /* no existing opens on this device */
  257. sdp->sgdebug = 0;
  258. q = sdp->device->request_queue;
  259. sdp->sg_tablesize = queue_max_segments(q);
  260. }
  261. if ((sfp = sg_add_sfp(sdp, dev)))
  262. filp->private_data = sfp;
  263. else {
  264. if (flags & O_EXCL) {
  265. sdp->exclude = 0; /* undo if error */
  266. wake_up_interruptible(&sdp->o_excl_wait);
  267. }
  268. retval = -ENOMEM;
  269. goto error_out;
  270. }
  271. retval = 0;
  272. error_out:
  273. if (retval)
  274. scsi_device_put(sdp->device);
  275. sg_put:
  276. if (sdp)
  277. sg_put_dev(sdp);
  278. unlock_kernel();
  279. return retval;
  280. }
  281. /* Following function was formerly called 'sg_close' */
  282. static int
  283. sg_release(struct inode *inode, struct file *filp)
  284. {
  285. Sg_device *sdp;
  286. Sg_fd *sfp;
  287. if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
  288. return -ENXIO;
  289. SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
  290. sfp->closed = 1;
  291. sdp->exclude = 0;
  292. wake_up_interruptible(&sdp->o_excl_wait);
  293. kref_put(&sfp->f_ref, sg_remove_sfp);
  294. return 0;
  295. }
  296. static ssize_t
  297. sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
  298. {
  299. Sg_device *sdp;
  300. Sg_fd *sfp;
  301. Sg_request *srp;
  302. int req_pack_id = -1;
  303. sg_io_hdr_t *hp;
  304. struct sg_header *old_hdr = NULL;
  305. int retval = 0;
  306. if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
  307. return -ENXIO;
  308. SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
  309. sdp->disk->disk_name, (int) count));
  310. if (!access_ok(VERIFY_WRITE, buf, count))
  311. return -EFAULT;
  312. if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
  313. old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
  314. if (!old_hdr)
  315. return -ENOMEM;
  316. if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
  317. retval = -EFAULT;
  318. goto free_old_hdr;
  319. }
  320. if (old_hdr->reply_len < 0) {
  321. if (count >= SZ_SG_IO_HDR) {
  322. sg_io_hdr_t *new_hdr;
  323. new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
  324. if (!new_hdr) {
  325. retval = -ENOMEM;
  326. goto free_old_hdr;
  327. }
  328. retval =__copy_from_user
  329. (new_hdr, buf, SZ_SG_IO_HDR);
  330. req_pack_id = new_hdr->pack_id;
  331. kfree(new_hdr);
  332. if (retval) {
  333. retval = -EFAULT;
  334. goto free_old_hdr;
  335. }
  336. }
  337. } else
  338. req_pack_id = old_hdr->pack_id;
  339. }
  340. srp = sg_get_rq_mark(sfp, req_pack_id);
  341. if (!srp) { /* now wait on packet to arrive */
  342. if (sdp->detached) {
  343. retval = -ENODEV;
  344. goto free_old_hdr;
  345. }
  346. if (filp->f_flags & O_NONBLOCK) {
  347. retval = -EAGAIN;
  348. goto free_old_hdr;
  349. }
  350. while (1) {
  351. retval = 0; /* following macro beats race condition */
  352. __wait_event_interruptible(sfp->read_wait,
  353. (sdp->detached ||
  354. (srp = sg_get_rq_mark(sfp, req_pack_id))),
  355. retval);
  356. if (sdp->detached) {
  357. retval = -ENODEV;
  358. goto free_old_hdr;
  359. }
  360. if (0 == retval)
  361. break;
  362. /* -ERESTARTSYS as signal hit process */
  363. goto free_old_hdr;
  364. }
  365. }
  366. if (srp->header.interface_id != '\0') {
  367. retval = sg_new_read(sfp, buf, count, srp);
  368. goto free_old_hdr;
  369. }
  370. hp = &srp->header;
  371. if (old_hdr == NULL) {
  372. old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
  373. if (! old_hdr) {
  374. retval = -ENOMEM;
  375. goto free_old_hdr;
  376. }
  377. }
  378. memset(old_hdr, 0, SZ_SG_HEADER);
  379. old_hdr->reply_len = (int) hp->timeout;
  380. old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
  381. old_hdr->pack_id = hp->pack_id;
  382. old_hdr->twelve_byte =
  383. ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
  384. old_hdr->target_status = hp->masked_status;
  385. old_hdr->host_status = hp->host_status;
  386. old_hdr->driver_status = hp->driver_status;
  387. if ((CHECK_CONDITION & hp->masked_status) ||
  388. (DRIVER_SENSE & hp->driver_status))
  389. memcpy(old_hdr->sense_buffer, srp->sense_b,
  390. sizeof (old_hdr->sense_buffer));
  391. switch (hp->host_status) {
  392. /* This setup of 'result' is for backward compatibility and is best
  393. ignored by the user who should use target, host + driver status */
  394. case DID_OK:
  395. case DID_PASSTHROUGH:
  396. case DID_SOFT_ERROR:
  397. old_hdr->result = 0;
  398. break;
  399. case DID_NO_CONNECT:
  400. case DID_BUS_BUSY:
  401. case DID_TIME_OUT:
  402. old_hdr->result = EBUSY;
  403. break;
  404. case DID_BAD_TARGET:
  405. case DID_ABORT:
  406. case DID_PARITY:
  407. case DID_RESET:
  408. case DID_BAD_INTR:
  409. old_hdr->result = EIO;
  410. break;
  411. case DID_ERROR:
  412. old_hdr->result = (srp->sense_b[0] == 0 &&
  413. hp->masked_status == GOOD) ? 0 : EIO;
  414. break;
  415. default:
  416. old_hdr->result = EIO;
  417. break;
  418. }
  419. /* Now copy the result back to the user buffer. */
  420. if (count >= SZ_SG_HEADER) {
  421. if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
  422. retval = -EFAULT;
  423. goto free_old_hdr;
  424. }
  425. buf += SZ_SG_HEADER;
  426. if (count > old_hdr->reply_len)
  427. count = old_hdr->reply_len;
  428. if (count > SZ_SG_HEADER) {
  429. if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
  430. retval = -EFAULT;
  431. goto free_old_hdr;
  432. }
  433. }
  434. } else
  435. count = (old_hdr->result == 0) ? 0 : -EIO;
  436. sg_finish_rem_req(srp);
  437. retval = count;
  438. free_old_hdr:
  439. kfree(old_hdr);
  440. return retval;
  441. }
  442. static ssize_t
  443. sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
  444. {
  445. sg_io_hdr_t *hp = &srp->header;
  446. int err = 0;
  447. int len;
  448. if (count < SZ_SG_IO_HDR) {
  449. err = -EINVAL;
  450. goto err_out;
  451. }
  452. hp->sb_len_wr = 0;
  453. if ((hp->mx_sb_len > 0) && hp->sbp) {
  454. if ((CHECK_CONDITION & hp->masked_status) ||
  455. (DRIVER_SENSE & hp->driver_status)) {
  456. int sb_len = SCSI_SENSE_BUFFERSIZE;
  457. sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
  458. len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
  459. len = (len > sb_len) ? sb_len : len;
  460. if (copy_to_user(hp->sbp, srp->sense_b, len)) {
  461. err = -EFAULT;
  462. goto err_out;
  463. }
  464. hp->sb_len_wr = len;
  465. }
  466. }
  467. if (hp->masked_status || hp->host_status || hp->driver_status)
  468. hp->info |= SG_INFO_CHECK;
  469. if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
  470. err = -EFAULT;
  471. goto err_out;
  472. }
  473. err_out:
  474. err = sg_finish_rem_req(srp);
  475. return (0 == err) ? count : err;
  476. }
  477. static ssize_t
  478. sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
  479. {
  480. int mxsize, cmd_size, k;
  481. int input_size, blocking;
  482. unsigned char opcode;
  483. Sg_device *sdp;
  484. Sg_fd *sfp;
  485. Sg_request *srp;
  486. struct sg_header old_hdr;
  487. sg_io_hdr_t *hp;
  488. unsigned char cmnd[MAX_COMMAND_SIZE];
  489. if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
  490. return -ENXIO;
  491. SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
  492. sdp->disk->disk_name, (int) count));
  493. if (sdp->detached)
  494. return -ENODEV;
  495. if (!((filp->f_flags & O_NONBLOCK) ||
  496. scsi_block_when_processing_errors(sdp->device)))
  497. return -ENXIO;
  498. if (!access_ok(VERIFY_READ, buf, count))
  499. return -EFAULT; /* protects following copy_from_user()s + get_user()s */
  500. if (count < SZ_SG_HEADER)
  501. return -EIO;
  502. if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
  503. return -EFAULT;
  504. blocking = !(filp->f_flags & O_NONBLOCK);
  505. if (old_hdr.reply_len < 0)
  506. return sg_new_write(sfp, filp, buf, count,
  507. blocking, 0, 0, NULL);
  508. if (count < (SZ_SG_HEADER + 6))
  509. return -EIO; /* The minimum scsi command length is 6 bytes. */
  510. if (!(srp = sg_add_request(sfp))) {
  511. SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
  512. return -EDOM;
  513. }
  514. buf += SZ_SG_HEADER;
  515. __get_user(opcode, buf);
  516. if (sfp->next_cmd_len > 0) {
  517. if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
  518. SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
  519. sfp->next_cmd_len = 0;
  520. sg_remove_request(sfp, srp);
  521. return -EIO;
  522. }
  523. cmd_size = sfp->next_cmd_len;
  524. sfp->next_cmd_len = 0; /* reset so only this write() effected */
  525. } else {
  526. cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
  527. if ((opcode >= 0xc0) && old_hdr.twelve_byte)
  528. cmd_size = 12;
  529. }
  530. SCSI_LOG_TIMEOUT(4, printk(
  531. "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
  532. /* Determine buffer size. */
  533. input_size = count - cmd_size;
  534. mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
  535. mxsize -= SZ_SG_HEADER;
  536. input_size -= SZ_SG_HEADER;
  537. if (input_size < 0) {
  538. sg_remove_request(sfp, srp);
  539. return -EIO; /* User did not pass enough bytes for this command. */
  540. }
  541. hp = &srp->header;
  542. hp->interface_id = '\0'; /* indicator of old interface tunnelled */
  543. hp->cmd_len = (unsigned char) cmd_size;
  544. hp->iovec_count = 0;
  545. hp->mx_sb_len = 0;
  546. if (input_size > 0)
  547. hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
  548. SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
  549. else
  550. hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
  551. hp->dxfer_len = mxsize;
  552. if (hp->dxfer_direction == SG_DXFER_TO_DEV)
  553. hp->dxferp = (char __user *)buf + cmd_size;
  554. else
  555. hp->dxferp = NULL;
  556. hp->sbp = NULL;
  557. hp->timeout = old_hdr.reply_len; /* structure abuse ... */
  558. hp->flags = input_size; /* structure abuse ... */
  559. hp->pack_id = old_hdr.pack_id;
  560. hp->usr_ptr = NULL;
  561. if (__copy_from_user(cmnd, buf, cmd_size))
  562. return -EFAULT;
  563. /*
  564. * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
  565. * but is is possible that the app intended SG_DXFER_TO_DEV, because there
  566. * is a non-zero input_size, so emit a warning.
  567. */
  568. if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
  569. static char cmd[TASK_COMM_LEN];
  570. if (strcmp(current->comm, cmd) && printk_ratelimit()) {
  571. printk(KERN_WARNING
  572. "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
  573. "guessing data in;\n "
  574. "program %s not setting count and/or reply_len properly\n",
  575. old_hdr.reply_len - (int)SZ_SG_HEADER,
  576. input_size, (unsigned int) cmnd[0],
  577. current->comm);
  578. strcpy(cmd, current->comm);
  579. }
  580. }
  581. k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
  582. return (k < 0) ? k : count;
  583. }
  584. static ssize_t
  585. sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
  586. size_t count, int blocking, int read_only, int sg_io_owned,
  587. Sg_request **o_srp)
  588. {
  589. int k;
  590. Sg_request *srp;
  591. sg_io_hdr_t *hp;
  592. unsigned char cmnd[MAX_COMMAND_SIZE];
  593. int timeout;
  594. unsigned long ul_timeout;
  595. if (count < SZ_SG_IO_HDR)
  596. return -EINVAL;
  597. if (!access_ok(VERIFY_READ, buf, count))
  598. return -EFAULT; /* protects following copy_from_user()s + get_user()s */
  599. sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
  600. if (!(srp = sg_add_request(sfp))) {
  601. SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
  602. return -EDOM;
  603. }
  604. srp->sg_io_owned = sg_io_owned;
  605. hp = &srp->header;
  606. if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
  607. sg_remove_request(sfp, srp);
  608. return -EFAULT;
  609. }
  610. if (hp->interface_id != 'S') {
  611. sg_remove_request(sfp, srp);
  612. return -ENOSYS;
  613. }
  614. if (hp->flags & SG_FLAG_MMAP_IO) {
  615. if (hp->dxfer_len > sfp->reserve.bufflen) {
  616. sg_remove_request(sfp, srp);
  617. return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
  618. }
  619. if (hp->flags & SG_FLAG_DIRECT_IO) {
  620. sg_remove_request(sfp, srp);
  621. return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
  622. }
  623. if (sg_res_in_use(sfp)) {
  624. sg_remove_request(sfp, srp);
  625. return -EBUSY; /* reserve buffer already being used */
  626. }
  627. }
  628. ul_timeout = msecs_to_jiffies(srp->header.timeout);
  629. timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
  630. if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
  631. sg_remove_request(sfp, srp);
  632. return -EMSGSIZE;
  633. }
  634. if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
  635. sg_remove_request(sfp, srp);
  636. return -EFAULT; /* protects following copy_from_user()s + get_user()s */
  637. }
  638. if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
  639. sg_remove_request(sfp, srp);
  640. return -EFAULT;
  641. }
  642. if (read_only && sg_allow_access(file, cmnd)) {
  643. sg_remove_request(sfp, srp);
  644. return -EPERM;
  645. }
  646. k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
  647. if (k < 0)
  648. return k;
  649. if (o_srp)
  650. *o_srp = srp;
  651. return count;
  652. }
  653. static int
  654. sg_common_write(Sg_fd * sfp, Sg_request * srp,
  655. unsigned char *cmnd, int timeout, int blocking)
  656. {
  657. int k, data_dir;
  658. Sg_device *sdp = sfp->parentdp;
  659. sg_io_hdr_t *hp = &srp->header;
  660. srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
  661. hp->status = 0;
  662. hp->masked_status = 0;
  663. hp->msg_status = 0;
  664. hp->info = 0;
  665. hp->host_status = 0;
  666. hp->driver_status = 0;
  667. hp->resid = 0;
  668. SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
  669. (int) cmnd[0], (int) hp->cmd_len));
  670. k = sg_start_req(srp, cmnd);
  671. if (k) {
  672. SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
  673. sg_finish_rem_req(srp);
  674. return k; /* probably out of space --> ENOMEM */
  675. }
  676. if (sdp->detached) {
  677. if (srp->bio)
  678. blk_end_request_all(srp->rq, -EIO);
  679. sg_finish_rem_req(srp);
  680. return -ENODEV;
  681. }
  682. switch (hp->dxfer_direction) {
  683. case SG_DXFER_TO_FROM_DEV:
  684. case SG_DXFER_FROM_DEV:
  685. data_dir = DMA_FROM_DEVICE;
  686. break;
  687. case SG_DXFER_TO_DEV:
  688. data_dir = DMA_TO_DEVICE;
  689. break;
  690. case SG_DXFER_UNKNOWN:
  691. data_dir = DMA_BIDIRECTIONAL;
  692. break;
  693. default:
  694. data_dir = DMA_NONE;
  695. break;
  696. }
  697. hp->duration = jiffies_to_msecs(jiffies);
  698. srp->rq->timeout = timeout;
  699. kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
  700. blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
  701. srp->rq, 1, sg_rq_end_io);
  702. return 0;
  703. }
  704. static int
  705. sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
  706. {
  707. void __user *p = (void __user *)arg;
  708. int __user *ip = p;
  709. int result, val, read_only;
  710. Sg_device *sdp;
  711. Sg_fd *sfp;
  712. Sg_request *srp;
  713. unsigned long iflags;
  714. if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
  715. return -ENXIO;
  716. SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
  717. sdp->disk->disk_name, (int) cmd_in));
  718. read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
  719. switch (cmd_in) {
  720. case SG_IO:
  721. {
  722. int blocking = 1; /* ignore O_NONBLOCK flag */
  723. if (sdp->detached)
  724. return -ENODEV;
  725. if (!scsi_block_when_processing_errors(sdp->device))
  726. return -ENXIO;
  727. if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
  728. return -EFAULT;
  729. result =
  730. sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
  731. blocking, read_only, 1, &srp);
  732. if (result < 0)
  733. return result;
  734. while (1) {
  735. result = 0; /* following macro to beat race condition */
  736. __wait_event_interruptible(sfp->read_wait,
  737. (srp->done || sdp->detached),
  738. result);
  739. if (sdp->detached)
  740. return -ENODEV;
  741. write_lock_irq(&sfp->rq_list_lock);
  742. if (srp->done) {
  743. srp->done = 2;
  744. write_unlock_irq(&sfp->rq_list_lock);
  745. break;
  746. }
  747. srp->orphan = 1;
  748. write_unlock_irq(&sfp->rq_list_lock);
  749. return result; /* -ERESTARTSYS because signal hit process */
  750. }
  751. result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
  752. return (result < 0) ? result : 0;
  753. }
  754. case SG_SET_TIMEOUT:
  755. result = get_user(val, ip);
  756. if (result)
  757. return result;
  758. if (val < 0)
  759. return -EIO;
  760. if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
  761. val = MULDIV (INT_MAX, USER_HZ, HZ);
  762. sfp->timeout_user = val;
  763. sfp->timeout = MULDIV (val, HZ, USER_HZ);
  764. return 0;
  765. case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
  766. /* strange ..., for backward compatibility */
  767. return sfp->timeout_user;
  768. case SG_SET_FORCE_LOW_DMA:
  769. result = get_user(val, ip);
  770. if (result)
  771. return result;
  772. if (val) {
  773. sfp->low_dma = 1;
  774. if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
  775. val = (int) sfp->reserve.bufflen;
  776. sg_remove_scat(&sfp->reserve);
  777. sg_build_reserve(sfp, val);
  778. }
  779. } else {
  780. if (sdp->detached)
  781. return -ENODEV;
  782. sfp->low_dma = sdp->device->host->unchecked_isa_dma;
  783. }
  784. return 0;
  785. case SG_GET_LOW_DMA:
  786. return put_user((int) sfp->low_dma, ip);
  787. case SG_GET_SCSI_ID:
  788. if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
  789. return -EFAULT;
  790. else {
  791. sg_scsi_id_t __user *sg_idp = p;
  792. if (sdp->detached)
  793. return -ENODEV;
  794. __put_user((int) sdp->device->host->host_no,
  795. &sg_idp->host_no);
  796. __put_user((int) sdp->device->channel,
  797. &sg_idp->channel);
  798. __put_user((int) sdp->device->id, &sg_idp->scsi_id);
  799. __put_user((int) sdp->device->lun, &sg_idp->lun);
  800. __put_user((int) sdp->device->type, &sg_idp->scsi_type);
  801. __put_user((short) sdp->device->host->cmd_per_lun,
  802. &sg_idp->h_cmd_per_lun);
  803. __put_user((short) sdp->device->queue_depth,
  804. &sg_idp->d_queue_depth);
  805. __put_user(0, &sg_idp->unused[0]);
  806. __put_user(0, &sg_idp->unused[1]);
  807. return 0;
  808. }
  809. case SG_SET_FORCE_PACK_ID:
  810. result = get_user(val, ip);
  811. if (result)
  812. return result;
  813. sfp->force_packid = val ? 1 : 0;
  814. return 0;
  815. case SG_GET_PACK_ID:
  816. if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
  817. return -EFAULT;
  818. read_lock_irqsave(&sfp->rq_list_lock, iflags);
  819. for (srp = sfp->headrp; srp; srp = srp->nextrp) {
  820. if ((1 == srp->done) && (!srp->sg_io_owned)) {
  821. read_unlock_irqrestore(&sfp->rq_list_lock,
  822. iflags);
  823. __put_user(srp->header.pack_id, ip);
  824. return 0;
  825. }
  826. }
  827. read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
  828. __put_user(-1, ip);
  829. return 0;
  830. case SG_GET_NUM_WAITING:
  831. read_lock_irqsave(&sfp->rq_list_lock, iflags);
  832. for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
  833. if ((1 == srp->done) && (!srp->sg_io_owned))
  834. ++val;
  835. }
  836. read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
  837. return put_user(val, ip);
  838. case SG_GET_SG_TABLESIZE:
  839. return put_user(sdp->sg_tablesize, ip);
  840. case SG_SET_RESERVED_SIZE:
  841. result = get_user(val, ip);
  842. if (result)
  843. return result;
  844. if (val < 0)
  845. return -EINVAL;
  846. val = min_t(int, val,
  847. queue_max_sectors(sdp->device->request_queue) * 512);
  848. if (val != sfp->reserve.bufflen) {
  849. if (sg_res_in_use(sfp) || sfp->mmap_called)
  850. return -EBUSY;
  851. sg_remove_scat(&sfp->reserve);
  852. sg_build_reserve(sfp, val);
  853. }
  854. return 0;
  855. case SG_GET_RESERVED_SIZE:
  856. val = min_t(int, sfp->reserve.bufflen,
  857. queue_max_sectors(sdp->device->request_queue) * 512);
  858. return put_user(val, ip);
  859. case SG_SET_COMMAND_Q:
  860. result = get_user(val, ip);
  861. if (result)
  862. return result;
  863. sfp->cmd_q = val ? 1 : 0;
  864. return 0;
  865. case SG_GET_COMMAND_Q:
  866. return put_user((int) sfp->cmd_q, ip);
  867. case SG_SET_KEEP_ORPHAN:
  868. result = get_user(val, ip);
  869. if (result)
  870. return result;
  871. sfp->keep_orphan = val;
  872. return 0;
  873. case SG_GET_KEEP_ORPHAN:
  874. return put_user((int) sfp->keep_orphan, ip);
  875. case SG_NEXT_CMD_LEN:
  876. result = get_user(val, ip);
  877. if (result)
  878. return result;
  879. sfp->next_cmd_len = (val > 0) ? val : 0;
  880. return 0;
  881. case SG_GET_VERSION_NUM:
  882. return put_user(sg_version_num, ip);
  883. case SG_GET_ACCESS_COUNT:
  884. /* faked - we don't have a real access count anymore */
  885. val = (sdp->device ? 1 : 0);
  886. return put_user(val, ip);
  887. case SG_GET_REQUEST_TABLE:
  888. if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
  889. return -EFAULT;
  890. else {
  891. sg_req_info_t *rinfo;
  892. unsigned int ms;
  893. rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
  894. GFP_KERNEL);
  895. if (!rinfo)
  896. return -ENOMEM;
  897. read_lock_irqsave(&sfp->rq_list_lock, iflags);
  898. for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
  899. ++val, srp = srp ? srp->nextrp : srp) {
  900. memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
  901. if (srp) {
  902. rinfo[val].req_state = srp->done + 1;
  903. rinfo[val].problem =
  904. srp->header.masked_status &
  905. srp->header.host_status &
  906. srp->header.driver_status;
  907. if (srp->done)
  908. rinfo[val].duration =
  909. srp->header.duration;
  910. else {
  911. ms = jiffies_to_msecs(jiffies);
  912. rinfo[val].duration =
  913. (ms > srp->header.duration) ?
  914. (ms - srp->header.duration) : 0;
  915. }
  916. rinfo[val].orphan = srp->orphan;
  917. rinfo[val].sg_io_owned =
  918. srp->sg_io_owned;
  919. rinfo[val].pack_id =
  920. srp->header.pack_id;
  921. rinfo[val].usr_ptr =
  922. srp->header.usr_ptr;
  923. }
  924. }
  925. read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
  926. result = __copy_to_user(p, rinfo,
  927. SZ_SG_REQ_INFO * SG_MAX_QUEUE);
  928. result = result ? -EFAULT : 0;
  929. kfree(rinfo);
  930. return result;
  931. }
  932. case SG_EMULATED_HOST:
  933. if (sdp->detached)
  934. return -ENODEV;
  935. return put_user(sdp->device->host->hostt->emulated, ip);
  936. case SG_SCSI_RESET:
  937. if (sdp->detached)
  938. return -ENODEV;
  939. if (filp->f_flags & O_NONBLOCK) {
  940. if (scsi_host_in_recovery(sdp->device->host))
  941. return -EBUSY;
  942. } else if (!scsi_block_when_processing_errors(sdp->device))
  943. return -EBUSY;
  944. result = get_user(val, ip);
  945. if (result)
  946. return result;
  947. if (SG_SCSI_RESET_NOTHING == val)
  948. return 0;
  949. switch (val) {
  950. case SG_SCSI_RESET_DEVICE:
  951. val = SCSI_TRY_RESET_DEVICE;
  952. break;
  953. case SG_SCSI_RESET_TARGET:
  954. val = SCSI_TRY_RESET_TARGET;
  955. break;
  956. case SG_SCSI_RESET_BUS:
  957. val = SCSI_TRY_RESET_BUS;
  958. break;
  959. case SG_SCSI_RESET_HOST:
  960. val = SCSI_TRY_RESET_HOST;
  961. break;
  962. default:
  963. return -EINVAL;
  964. }
  965. if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
  966. return -EACCES;
  967. return (scsi_reset_provider(sdp->device, val) ==
  968. SUCCESS) ? 0 : -EIO;
  969. case SCSI_IOCTL_SEND_COMMAND:
  970. if (sdp->detached)
  971. return -ENODEV;
  972. if (read_only) {
  973. unsigned char opcode = WRITE_6;
  974. Scsi_Ioctl_Command __user *siocp = p;
  975. if (copy_from_user(&opcode, siocp->data, 1))
  976. return -EFAULT;
  977. if (sg_allow_access(filp, &opcode))
  978. return -EPERM;
  979. }
  980. return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
  981. case SG_SET_DEBUG:
  982. result = get_user(val, ip);
  983. if (result)
  984. return result;
  985. sdp->sgdebug = (char) val;
  986. return 0;
  987. case SCSI_IOCTL_GET_IDLUN:
  988. case SCSI_IOCTL_GET_BUS_NUMBER:
  989. case SCSI_IOCTL_PROBE_HOST:
  990. case SG_GET_TRANSFORM:
  991. if (sdp->detached)
  992. return -ENODEV;
  993. return scsi_ioctl(sdp->device, cmd_in, p);
  994. case BLKSECTGET:
  995. return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
  996. ip);
  997. case BLKTRACESETUP:
  998. return blk_trace_setup(sdp->device->request_queue,
  999. sdp->disk->disk_name,
  1000. MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
  1001. NULL,
  1002. (char *)arg);
  1003. case BLKTRACESTART:
  1004. return blk_trace_startstop(sdp->device->request_queue, 1);
  1005. case BLKTRACESTOP:
  1006. return blk_trace_startstop(sdp->device->request_queue, 0);
  1007. case BLKTRACETEARDOWN:
  1008. return blk_trace_remove(sdp->device->request_queue);
  1009. default:
  1010. if (read_only)
  1011. return -EPERM; /* don't know so take safe approach */
  1012. return scsi_ioctl(sdp->device, cmd_in, p);
  1013. }
  1014. }
  1015. static long
  1016. sg_unlocked_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
  1017. {
  1018. int ret;
  1019. lock_kernel();
  1020. ret = sg_ioctl(filp, cmd_in, arg);
  1021. unlock_kernel();
  1022. return ret;
  1023. }
  1024. #ifdef CONFIG_COMPAT
  1025. static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
  1026. {
  1027. Sg_device *sdp;
  1028. Sg_fd *sfp;
  1029. struct scsi_device *sdev;
  1030. if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
  1031. return -ENXIO;
  1032. sdev = sdp->device;
  1033. if (sdev->host->hostt->compat_ioctl) {
  1034. int ret;
  1035. ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
  1036. return ret;
  1037. }
  1038. return -ENOIOCTLCMD;
  1039. }
  1040. #endif
  1041. static unsigned int
  1042. sg_poll(struct file *filp, poll_table * wait)
  1043. {
  1044. unsigned int res = 0;
  1045. Sg_device *sdp;
  1046. Sg_fd *sfp;
  1047. Sg_request *srp;
  1048. int count = 0;
  1049. unsigned long iflags;
  1050. if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
  1051. || sfp->closed)
  1052. return POLLERR;
  1053. poll_wait(filp, &sfp->read_wait, wait);
  1054. read_lock_irqsave(&sfp->rq_list_lock, iflags);
  1055. for (srp = sfp->headrp; srp; srp = srp->nextrp) {
  1056. /* if any read waiting, flag it */
  1057. if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
  1058. res = POLLIN | POLLRDNORM;
  1059. ++count;
  1060. }
  1061. read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
  1062. if (sdp->detached)
  1063. res |= POLLHUP;
  1064. else if (!sfp->cmd_q) {
  1065. if (0 == count)
  1066. res |= POLLOUT | POLLWRNORM;
  1067. } else if (count < SG_MAX_QUEUE)
  1068. res |= POLLOUT | POLLWRNORM;
  1069. SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
  1070. sdp->disk->disk_name, (int) res));
  1071. return res;
  1072. }
  1073. static int
  1074. sg_fasync(int fd, struct file *filp, int mode)
  1075. {
  1076. Sg_device *sdp;
  1077. Sg_fd *sfp;
  1078. if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
  1079. return -ENXIO;
  1080. SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
  1081. sdp->disk->disk_name, mode));
  1082. return fasync_helper(fd, filp, mode, &sfp->async_qp);
  1083. }
  1084. static int
  1085. sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  1086. {
  1087. Sg_fd *sfp;
  1088. unsigned long offset, len, sa;
  1089. Sg_scatter_hold *rsv_schp;
  1090. int k, length;
  1091. if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
  1092. return VM_FAULT_SIGBUS;
  1093. rsv_schp = &sfp->reserve;
  1094. offset = vmf->pgoff << PAGE_SHIFT;
  1095. if (offset >= rsv_schp->bufflen)
  1096. return VM_FAULT_SIGBUS;
  1097. SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
  1098. offset, rsv_schp->k_use_sg));
  1099. sa = vma->vm_start;
  1100. length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
  1101. for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
  1102. len = vma->vm_end - sa;
  1103. len = (len < length) ? len : length;
  1104. if (offset < len) {
  1105. struct page *page = nth_page(rsv_schp->pages[k],
  1106. offset >> PAGE_SHIFT);
  1107. get_page(page); /* increment page count */
  1108. vmf->page = page;
  1109. return 0; /* success */
  1110. }
  1111. sa += len;
  1112. offset -= len;
  1113. }
  1114. return VM_FAULT_SIGBUS;
  1115. }
  1116. static const struct vm_operations_struct sg_mmap_vm_ops = {
  1117. .fault = sg_vma_fault,
  1118. };
  1119. static int
  1120. sg_mmap(struct file *filp, struct vm_area_struct *vma)
  1121. {
  1122. Sg_fd *sfp;
  1123. unsigned long req_sz, len, sa;
  1124. Sg_scatter_hold *rsv_schp;
  1125. int k, length;
  1126. if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
  1127. return -ENXIO;
  1128. req_sz = vma->vm_end - vma->vm_start;
  1129. SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
  1130. (void *) vma->vm_start, (int) req_sz));
  1131. if (vma->vm_pgoff)
  1132. return -EINVAL; /* want no offset */
  1133. rsv_schp = &sfp->reserve;
  1134. if (req_sz > rsv_schp->bufflen)
  1135. return -ENOMEM; /* cannot map more than reserved buffer */
  1136. sa = vma->vm_start;
  1137. length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
  1138. for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
  1139. len = vma->vm_end - sa;
  1140. len = (len < length) ? len : length;
  1141. sa += len;
  1142. }
  1143. sfp->mmap_called = 1;
  1144. vma->vm_flags |= VM_RESERVED;
  1145. vma->vm_private_data = sfp;
  1146. vma->vm_ops = &sg_mmap_vm_ops;
  1147. return 0;
  1148. }
  1149. static void sg_rq_end_io_usercontext(struct work_struct *work)
  1150. {
  1151. struct sg_request *srp = container_of(work, struct sg_request, ew.work);
  1152. struct sg_fd *sfp = srp->parentfp;
  1153. sg_finish_rem_req(srp);
  1154. kref_put(&sfp->f_ref, sg_remove_sfp);
  1155. }
  1156. /*
  1157. * This function is a "bottom half" handler that is called by the mid
  1158. * level when a command is completed (or has failed).
  1159. */
  1160. static void sg_rq_end_io(struct request *rq, int uptodate)
  1161. {
  1162. struct sg_request *srp = rq->end_io_data;
  1163. Sg_device *sdp;
  1164. Sg_fd *sfp;
  1165. unsigned long iflags;
  1166. unsigned int ms;
  1167. char *sense;
  1168. int result, resid, done = 1;
  1169. if (WARN_ON(srp->done != 0))
  1170. return;
  1171. sfp = srp->parentfp;
  1172. if (WARN_ON(sfp == NULL))
  1173. return;
  1174. sdp = sfp->parentdp;
  1175. if (unlikely(sdp->detached))
  1176. printk(KERN_INFO "sg_rq_end_io: device detached\n");
  1177. sense = rq->sense;
  1178. result = rq->errors;
  1179. resid = rq->resid_len;
  1180. SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
  1181. sdp->disk->disk_name, srp->header.pack_id, result));
  1182. srp->header.resid = resid;
  1183. ms = jiffies_to_msecs(jiffies);
  1184. srp->header.duration = (ms > srp->header.duration) ?
  1185. (ms - srp->header.duration) : 0;
  1186. if (0 != result) {
  1187. struct scsi_sense_hdr sshdr;
  1188. srp->header.status = 0xff & result;
  1189. srp->header.masked_status = status_byte(result);
  1190. srp->header.msg_status = msg_byte(result);
  1191. srp->header.host_status = host_byte(result);
  1192. srp->header.driver_status = driver_byte(result);
  1193. if ((sdp->sgdebug > 0) &&
  1194. ((CHECK_CONDITION == srp->header.masked_status) ||
  1195. (COMMAND_TERMINATED == srp->header.masked_status)))
  1196. __scsi_print_sense("sg_cmd_done", sense,
  1197. SCSI_SENSE_BUFFERSIZE);
  1198. /* Following if statement is a patch supplied by Eric Youngdale */
  1199. if (driver_byte(result) != 0
  1200. && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
  1201. && !scsi_sense_is_deferred(&sshdr)
  1202. && sshdr.sense_key == UNIT_ATTENTION
  1203. && sdp->device->removable) {
  1204. /* Detected possible disc change. Set the bit - this */
  1205. /* may be used if there are filesystems using this device */
  1206. sdp->device->changed = 1;
  1207. }
  1208. }
  1209. /* Rely on write phase to clean out srp status values, so no "else" */
  1210. write_lock_irqsave(&sfp->rq_list_lock, iflags);
  1211. if (unlikely(srp->orphan)) {
  1212. if (sfp->keep_orphan)
  1213. srp->sg_io_owned = 0;
  1214. else
  1215. done = 0;
  1216. }
  1217. srp->done = done;
  1218. write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
  1219. if (likely(done)) {
  1220. /* Now wake up any sg_read() that is waiting for this
  1221. * packet.
  1222. */
  1223. wake_up_interruptible(&sfp->read_wait);
  1224. kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
  1225. kref_put(&sfp->f_ref, sg_remove_sfp);
  1226. } else {
  1227. INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
  1228. schedule_work(&srp->ew.work);
  1229. }
  1230. }
  1231. static const struct file_operations sg_fops = {
  1232. .owner = THIS_MODULE,
  1233. .read = sg_read,
  1234. .write = sg_write,
  1235. .poll = sg_poll,
  1236. .unlocked_ioctl = sg_unlocked_ioctl,
  1237. #ifdef CONFIG_COMPAT
  1238. .compat_ioctl = sg_compat_ioctl,
  1239. #endif
  1240. .open = sg_open,
  1241. .mmap = sg_mmap,
  1242. .release = sg_release,
  1243. .fasync = sg_fasync,
  1244. };
  1245. static struct class *sg_sysfs_class;
  1246. static int sg_sysfs_valid = 0;
  1247. static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
  1248. {
  1249. struct request_queue *q = scsidp->request_queue;
  1250. Sg_device *sdp;
  1251. unsigned long iflags;
  1252. int error;
  1253. u32 k;
  1254. sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
  1255. if (!sdp) {
  1256. printk(KERN_WARNING "kmalloc Sg_device failure\n");
  1257. return ERR_PTR(-ENOMEM);
  1258. }
  1259. if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
  1260. printk(KERN_WARNING "idr expansion Sg_device failure\n");
  1261. error = -ENOMEM;
  1262. goto out;
  1263. }
  1264. write_lock_irqsave(&sg_index_lock, iflags);
  1265. error = idr_get_new(&sg_index_idr, sdp, &k);
  1266. if (error) {
  1267. write_unlock_irqrestore(&sg_index_lock, iflags);
  1268. printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
  1269. error);
  1270. goto out;
  1271. }
  1272. if (unlikely(k >= SG_MAX_DEVS))
  1273. goto overflow;
  1274. SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
  1275. sprintf(disk->disk_name, "sg%d", k);
  1276. disk->first_minor = k;
  1277. sdp->disk = disk;
  1278. sdp->device = scsidp;
  1279. INIT_LIST_HEAD(&sdp->sfds);
  1280. init_waitqueue_head(&sdp->o_excl_wait);
  1281. sdp->sg_tablesize = queue_max_segments(q);
  1282. sdp->index = k;
  1283. kref_init(&sdp->d_ref);
  1284. write_unlock_irqrestore(&sg_index_lock, iflags);
  1285. error = 0;
  1286. out:
  1287. if (error) {
  1288. kfree(sdp);
  1289. return ERR_PTR(error);
  1290. }
  1291. return sdp;
  1292. overflow:
  1293. idr_remove(&sg_index_idr, k);
  1294. write_unlock_irqrestore(&sg_index_lock, iflags);
  1295. sdev_printk(KERN_WARNING, scsidp,
  1296. "Unable to attach sg device type=%d, minor "
  1297. "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
  1298. error = -ENODEV;
  1299. goto out;
  1300. }
  1301. static int
  1302. sg_add(struct device *cl_dev, struct class_interface *cl_intf)
  1303. {
  1304. struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
  1305. struct gendisk *disk;
  1306. Sg_device *sdp = NULL;
  1307. struct cdev * cdev = NULL;
  1308. int error;
  1309. unsigned long iflags;
  1310. disk = alloc_disk(1);
  1311. if (!disk) {
  1312. printk(KERN_WARNING "alloc_disk failed\n");
  1313. return -ENOMEM;
  1314. }
  1315. disk->major = SCSI_GENERIC_MAJOR;
  1316. error = -ENOMEM;
  1317. cdev = cdev_alloc();
  1318. if (!cdev) {
  1319. printk(KERN_WARNING "cdev_alloc failed\n");
  1320. goto out;
  1321. }
  1322. cdev->owner = THIS_MODULE;
  1323. cdev->ops = &sg_fops;
  1324. sdp = sg_alloc(disk, scsidp);
  1325. if (IS_ERR(sdp)) {
  1326. printk(KERN_WARNING "sg_alloc failed\n");
  1327. error = PTR_ERR(sdp);
  1328. goto out;
  1329. }
  1330. error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
  1331. if (error)
  1332. goto cdev_add_err;
  1333. sdp->cdev = cdev;
  1334. if (sg_sysfs_valid) {
  1335. struct device *sg_class_member;
  1336. sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
  1337. MKDEV(SCSI_GENERIC_MAJOR,
  1338. sdp->index),
  1339. sdp, "%s", disk->disk_name);
  1340. if (IS_ERR(sg_class_member)) {
  1341. printk(KERN_ERR "sg_add: "
  1342. "device_create failed\n");
  1343. error = PTR_ERR(sg_class_member);
  1344. goto cdev_add_err;
  1345. }
  1346. error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
  1347. &sg_class_member->kobj, "generic");
  1348. if (error)
  1349. printk(KERN_ERR "sg_add: unable to make symlink "
  1350. "'generic' back to sg%d\n", sdp->index);
  1351. } else
  1352. printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
  1353. sdev_printk(KERN_NOTICE, scsidp,
  1354. "Attached scsi generic sg%d type %d\n", sdp->index,
  1355. scsidp->type);
  1356. dev_set_drvdata(cl_dev, sdp);
  1357. return 0;
  1358. cdev_add_err:
  1359. write_lock_irqsave(&sg_index_lock, iflags);
  1360. idr_remove(&sg_index_idr, sdp->index);
  1361. write_unlock_irqrestore(&sg_index_lock, iflags);
  1362. kfree(sdp);
  1363. out:
  1364. put_disk(disk);
  1365. if (cdev)
  1366. cdev_del(cdev);
  1367. return error;
  1368. }
  1369. static void sg_device_destroy(struct kref *kref)
  1370. {
  1371. struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
  1372. unsigned long flags;
  1373. /* CAUTION! Note that the device can still be found via idr_find()
  1374. * even though the refcount is 0. Therefore, do idr_remove() BEFORE
  1375. * any other cleanup.
  1376. */
  1377. write_lock_irqsave(&sg_index_lock, flags);
  1378. idr_remove(&sg_index_idr, sdp->index);
  1379. write_unlock_irqrestore(&sg_index_lock, flags);
  1380. SCSI_LOG_TIMEOUT(3,
  1381. printk("sg_device_destroy: %s\n",
  1382. sdp->disk->disk_name));
  1383. put_disk(sdp->disk);
  1384. kfree(sdp);
  1385. }
  1386. static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
  1387. {
  1388. struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
  1389. Sg_device *sdp = dev_get_drvdata(cl_dev);
  1390. unsigned long iflags;
  1391. Sg_fd *sfp;
  1392. if (!sdp || sdp->detached)
  1393. return;
  1394. SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
  1395. /* Need a write lock to set sdp->detached. */
  1396. write_lock_irqsave(&sg_index_lock, iflags);
  1397. sdp->detached = 1;
  1398. list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
  1399. wake_up_interruptible(&sfp->read_wait);
  1400. kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
  1401. }
  1402. write_unlock_irqrestore(&sg_index_lock, iflags);
  1403. sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
  1404. device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
  1405. cdev_del(sdp->cdev);
  1406. sdp->cdev = NULL;
  1407. sg_put_dev(sdp);
  1408. }
  1409. module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
  1410. module_param_named(def_reserved_size, def_reserved_size, int,
  1411. S_IRUGO | S_IWUSR);
  1412. module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
  1413. MODULE_AUTHOR("Douglas Gilbert");
  1414. MODULE_DESCRIPTION("SCSI generic (sg) driver");
  1415. MODULE_LICENSE("GPL");
  1416. MODULE_VERSION(SG_VERSION_STR);
  1417. MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
  1418. MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
  1419. "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
  1420. MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
  1421. MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
  1422. static int __init
  1423. init_sg(void)
  1424. {
  1425. int rc;
  1426. if (scatter_elem_sz < PAGE_SIZE) {
  1427. scatter_elem_sz = PAGE_SIZE;
  1428. scatter_elem_sz_prev = scatter_elem_sz;
  1429. }
  1430. if (def_reserved_size >= 0)
  1431. sg_big_buff = def_reserved_size;
  1432. else
  1433. def_reserved_size = sg_big_buff;
  1434. rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
  1435. SG_MAX_DEVS, "sg");
  1436. if (rc)
  1437. return rc;
  1438. sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
  1439. if ( IS_ERR(sg_sysfs_class) ) {
  1440. rc = PTR_ERR(sg_sysfs_class);
  1441. goto err_out;
  1442. }
  1443. sg_sysfs_valid = 1;
  1444. rc = scsi_register_interface(&sg_interface);
  1445. if (0 == rc) {
  1446. #ifdef CONFIG_SCSI_PROC_FS
  1447. sg_proc_init();
  1448. #endif /* CONFIG_SCSI_PROC_FS */
  1449. return 0;
  1450. }
  1451. class_destroy(sg_sysfs_class);
  1452. err_out:
  1453. unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
  1454. return rc;
  1455. }
  1456. static void __exit
  1457. exit_sg(void)
  1458. {
  1459. #ifdef CONFIG_SCSI_PROC_FS
  1460. sg_proc_cleanup();
  1461. #endif /* CONFIG_SCSI_PROC_FS */
  1462. scsi_unregister_interface(&sg_interface);
  1463. class_destroy(sg_sysfs_class);
  1464. sg_sysfs_valid = 0;
  1465. unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
  1466. SG_MAX_DEVS);
  1467. idr_destroy(&sg_index_idr);
  1468. }
  1469. static int sg_start_req(Sg_request *srp, unsigned char *cmd)
  1470. {
  1471. int res;
  1472. struct request *rq;
  1473. Sg_fd *sfp = srp->parentfp;
  1474. sg_io_hdr_t *hp = &srp->header;
  1475. int dxfer_len = (int) hp->dxfer_len;
  1476. int dxfer_dir = hp->dxfer_direction;
  1477. unsigned int iov_count = hp->iovec_count;
  1478. Sg_scatter_hold *req_schp = &srp->data;
  1479. Sg_scatter_hold *rsv_schp = &sfp->reserve;
  1480. struct request_queue *q = sfp->parentdp->device->request_queue;
  1481. struct rq_map_data *md, map_data;
  1482. int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
  1483. SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
  1484. dxfer_len));
  1485. rq = blk_get_request(q, rw, GFP_ATOMIC);
  1486. if (!rq)
  1487. return -ENOMEM;
  1488. memcpy(rq->cmd, cmd, hp->cmd_len);
  1489. rq->cmd_len = hp->cmd_len;
  1490. rq->cmd_type = REQ_TYPE_BLOCK_PC;
  1491. srp->rq = rq;
  1492. rq->end_io_data = srp;
  1493. rq->sense = srp->sense_b;
  1494. rq->retries = SG_DEFAULT_RETRIES;
  1495. if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
  1496. return 0;
  1497. if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
  1498. dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
  1499. !sfp->parentdp->device->host->unchecked_isa_dma &&
  1500. blk_rq_aligned(q, hp->dxferp, dxfer_len))
  1501. md = NULL;
  1502. else
  1503. md = &map_data;
  1504. if (md) {
  1505. if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
  1506. sg_link_reserve(sfp, srp, dxfer_len);
  1507. else {
  1508. res = sg_build_indirect(req_schp, sfp, dxfer_len);
  1509. if (res)
  1510. return res;
  1511. }
  1512. md->pages = req_schp->pages;
  1513. md->page_order = req_schp->page_order;
  1514. md->nr_entries = req_schp->k_use_sg;
  1515. md->offset = 0;
  1516. md->null_mapped = hp->dxferp ? 0 : 1;
  1517. if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
  1518. md->from_user = 1;
  1519. else
  1520. md->from_user = 0;
  1521. }
  1522. if (iov_count) {
  1523. int len, size = sizeof(struct sg_iovec) * iov_count;
  1524. struct iovec *iov;
  1525. iov = kmalloc(size, GFP_ATOMIC);
  1526. if (!iov)
  1527. return -ENOMEM;
  1528. if (copy_from_user(iov, hp->dxferp, size)) {
  1529. kfree(iov);
  1530. return -EFAULT;
  1531. }
  1532. len = iov_length(iov, iov_count);
  1533. if (hp->dxfer_len < len) {
  1534. iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
  1535. len = hp->dxfer_len;
  1536. }
  1537. res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
  1538. iov_count,
  1539. len, GFP_ATOMIC);
  1540. kfree(iov);
  1541. } else
  1542. res = blk_rq_map_user(q, rq, md, hp->dxferp,
  1543. hp->dxfer_len, GFP_ATOMIC);
  1544. if (!res) {
  1545. srp->bio = rq->bio;
  1546. if (!md) {
  1547. req_schp->dio_in_use = 1;
  1548. hp->info |= SG_INFO_DIRECT_IO;
  1549. }
  1550. }
  1551. return res;
  1552. }
  1553. static int sg_finish_rem_req(Sg_request * srp)
  1554. {
  1555. int ret = 0;
  1556. Sg_fd *sfp = srp->parentfp;
  1557. Sg_scatter_hold *req_schp = &srp->data;
  1558. SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
  1559. if (srp->rq) {
  1560. if (srp->bio)
  1561. ret = blk_rq_unmap_user(srp->bio);
  1562. blk_put_request(srp->rq);
  1563. }
  1564. if (srp->res_used)
  1565. sg_unlink_reserve(sfp, srp);
  1566. else
  1567. sg_remove_scat(req_schp);
  1568. sg_remove_request(sfp, srp);
  1569. return ret;
  1570. }
  1571. static int
  1572. sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
  1573. {
  1574. int sg_bufflen = tablesize * sizeof(struct page *);
  1575. gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
  1576. schp->pages = kzalloc(sg_bufflen, gfp_flags);
  1577. if (!schp->pages)
  1578. return -ENOMEM;
  1579. schp->sglist_len = sg_bufflen;
  1580. return tablesize; /* number of scat_gath elements allocated */
  1581. }
  1582. static int
  1583. sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
  1584. {
  1585. int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
  1586. int sg_tablesize = sfp->parentdp->sg_tablesize;
  1587. int blk_size = buff_size, order;
  1588. gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
  1589. if (blk_size < 0)
  1590. return -EFAULT;
  1591. if (0 == blk_size)
  1592. ++blk_size; /* don't know why */
  1593. /* round request up to next highest SG_SECTOR_SZ byte boundary */
  1594. blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
  1595. SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
  1596. buff_size, blk_size));
  1597. /* N.B. ret_sz carried into this block ... */
  1598. mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
  1599. if (mx_sc_elems < 0)
  1600. return mx_sc_elems; /* most likely -ENOMEM */
  1601. num = scatter_elem_sz;
  1602. if (unlikely(num != scatter_elem_sz_prev)) {
  1603. if (num < PAGE_SIZE) {
  1604. scatter_elem_sz = PAGE_SIZE;
  1605. scatter_elem_sz_prev = PAGE_SIZE;
  1606. } else
  1607. scatter_elem_sz_prev = num;
  1608. }
  1609. if (sfp->low_dma)
  1610. gfp_mask |= GFP_DMA;
  1611. if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
  1612. gfp_mask |= __GFP_ZERO;
  1613. order = get_order(num);
  1614. retry:
  1615. ret_sz = 1 << (PAGE_SHIFT + order);
  1616. for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
  1617. k++, rem_sz -= ret_sz) {
  1618. num = (rem_sz > scatter_elem_sz_prev) ?
  1619. scatter_elem_sz_prev : rem_sz;
  1620. schp->pages[k] = alloc_pages(gfp_mask, order);
  1621. if (!schp->pages[k])
  1622. goto out;
  1623. if (num == scatter_elem_sz_prev) {
  1624. if (unlikely(ret_sz > scatter_elem_sz_prev)) {
  1625. scatter_elem_sz = ret_sz;
  1626. scatter_elem_sz_prev = ret_sz;
  1627. }
  1628. }
  1629. SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
  1630. "ret_sz=%d\n", k, num, ret_sz));
  1631. } /* end of for loop */
  1632. schp->page_order = order;
  1633. schp->k_use_sg = k;
  1634. SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
  1635. "rem_sz=%d\n", k, rem_sz));
  1636. schp->bufflen = blk_size;
  1637. if (rem_sz > 0) /* must have failed */
  1638. return -ENOMEM;
  1639. return 0;
  1640. out:
  1641. for (i = 0; i < k; i++)
  1642. __free_pages(schp->pages[i], order);
  1643. if (--order >= 0)
  1644. goto retry;
  1645. return -ENOMEM;
  1646. }
  1647. static void
  1648. sg_remove_scat(Sg_scatter_hold * schp)
  1649. {
  1650. SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
  1651. if (schp->pages && schp->sglist_len > 0) {
  1652. if (!schp->dio_in_use) {
  1653. int k;
  1654. for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
  1655. SCSI_LOG_TIMEOUT(5, printk(
  1656. "sg_remove_scat: k=%d, pg=0x%p\n",
  1657. k, schp->pages[k]));
  1658. __free_pages(schp->pages[k], schp->page_order);
  1659. }
  1660. kfree(schp->pages);
  1661. }
  1662. }
  1663. memset(schp, 0, sizeof (*schp));
  1664. }
  1665. static int
  1666. sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
  1667. {
  1668. Sg_scatter_hold *schp = &srp->data;
  1669. int k, num;
  1670. SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
  1671. num_read_xfer));
  1672. if ((!outp) || (num_read_xfer <= 0))
  1673. return 0;
  1674. num = 1 << (PAGE_SHIFT + schp->page_order);
  1675. for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
  1676. if (num > num_read_xfer) {
  1677. if (__copy_to_user(outp, page_address(schp->pages[k]),
  1678. num_read_xfer))
  1679. return -EFAULT;
  1680. break;
  1681. } else {
  1682. if (__copy_to_user(outp, page_address(schp->pages[k]),
  1683. num))
  1684. return -EFAULT;
  1685. num_read_xfer -= num;
  1686. if (num_read_xfer <= 0)
  1687. break;
  1688. outp += num;
  1689. }
  1690. }
  1691. return 0;
  1692. }
  1693. static void
  1694. sg_build_reserve(Sg_fd * sfp, int req_size)
  1695. {
  1696. Sg_scatter_hold *schp = &sfp->reserve;
  1697. SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
  1698. do {
  1699. if (req_size < PAGE_SIZE)
  1700. req_size = PAGE_SIZE;
  1701. if (0 == sg_build_indirect(schp, sfp, req_size))
  1702. return;
  1703. else
  1704. sg_remove_scat(schp);
  1705. req_size >>= 1; /* divide by 2 */
  1706. } while (req_size > (PAGE_SIZE / 2));
  1707. }
  1708. static void
  1709. sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
  1710. {
  1711. Sg_scatter_hold *req_schp = &srp->data;
  1712. Sg_scatter_hold *rsv_schp = &sfp->reserve;
  1713. int k, num, rem;
  1714. srp->res_used = 1;
  1715. SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
  1716. rem = size;
  1717. num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
  1718. for (k = 0; k < rsv_schp->k_use_sg; k++) {
  1719. if (rem <= num) {
  1720. req_schp->k_use_sg = k + 1;
  1721. req_schp->sglist_len = rsv_schp->sglist_len;
  1722. req_schp->pages = rsv_schp->pages;
  1723. req_schp->bufflen = size;
  1724. req_schp->page_order = rsv_schp->page_order;
  1725. break;
  1726. } else
  1727. rem -= num;
  1728. }
  1729. if (k >= rsv_schp->k_use_sg)
  1730. SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
  1731. }
  1732. static void
  1733. sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
  1734. {
  1735. Sg_scatter_hold *req_schp = &srp->data;
  1736. SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
  1737. (int) req_schp->k_use_sg));
  1738. req_schp->k_use_sg = 0;
  1739. req_schp->bufflen = 0;
  1740. req_schp->pages = NULL;
  1741. req_schp->page_order = 0;
  1742. req_schp->sglist_len = 0;
  1743. sfp->save_scat_len = 0;
  1744. srp->res_used = 0;
  1745. }
  1746. static Sg_request *
  1747. sg_get_rq_mark(Sg_fd * sfp, int pack_id)
  1748. {
  1749. Sg_request *resp;
  1750. unsigned long iflags;
  1751. write_lock_irqsave(&sfp->rq_list_lock, iflags);
  1752. for (resp = sfp->headrp; resp; resp = resp->nextrp) {
  1753. /* look for requests that are ready + not SG_IO owned */
  1754. if ((1 == resp->done) && (!resp->sg_io_owned) &&
  1755. ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
  1756. resp->done = 2; /* guard against other readers */
  1757. break;
  1758. }
  1759. }
  1760. write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
  1761. return resp;
  1762. }
  1763. /* always adds to end of list */
  1764. static Sg_request *
  1765. sg_add_request(Sg_fd * sfp)
  1766. {
  1767. int k;
  1768. unsigned long iflags;
  1769. Sg_request *resp;
  1770. Sg_request *rp = sfp->req_arr;
  1771. write_lock_irqsave(&sfp->rq_list_lock, iflags);
  1772. resp = sfp->headrp;
  1773. if (!resp) {
  1774. memset(rp, 0, sizeof (Sg_request));
  1775. rp->parentfp = sfp;
  1776. resp = rp;
  1777. sfp->headrp = resp;
  1778. } else {
  1779. if (0 == sfp->cmd_q)
  1780. resp = NULL; /* command queuing disallowed */
  1781. else {
  1782. for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
  1783. if (!rp->parentfp)
  1784. break;
  1785. }
  1786. if (k < SG_MAX_QUEUE) {
  1787. memset(rp, 0, sizeof (Sg_request));
  1788. rp->parentfp = sfp;
  1789. while (resp->nextrp)
  1790. resp = resp->nextrp;
  1791. resp->nextrp = rp;
  1792. resp = rp;
  1793. } else
  1794. resp = NULL;
  1795. }
  1796. }
  1797. if (resp) {
  1798. resp->nextrp = NULL;
  1799. resp->header.duration = jiffies_to_msecs(jiffies);
  1800. }
  1801. write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
  1802. return resp;
  1803. }
  1804. /* Return of 1 for found; 0 for not found */
  1805. static int
  1806. sg_remove_request(Sg_fd * sfp, Sg_request * srp)
  1807. {
  1808. Sg_request *prev_rp;
  1809. Sg_request *rp;
  1810. unsigned long iflags;
  1811. int res = 0;
  1812. if ((!sfp) || (!srp) || (!sfp->headrp))
  1813. return res;
  1814. write_lock_irqsave(&sfp->rq_list_lock, iflags);
  1815. prev_rp = sfp->headrp;
  1816. if (srp == prev_rp) {
  1817. sfp->headrp = prev_rp->nextrp;
  1818. prev_rp->parentfp = NULL;
  1819. res = 1;
  1820. } else {
  1821. while ((rp = prev_rp->nextrp)) {
  1822. if (srp == rp) {
  1823. prev_rp->nextrp = rp->nextrp;
  1824. rp->parentfp = NULL;
  1825. res = 1;
  1826. break;
  1827. }
  1828. prev_rp = rp;
  1829. }
  1830. }
  1831. write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
  1832. return res;
  1833. }
  1834. static Sg_fd *
  1835. sg_add_sfp(Sg_device * sdp, int dev)
  1836. {
  1837. Sg_fd *sfp;
  1838. unsigned long iflags;
  1839. int bufflen;
  1840. sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
  1841. if (!sfp)
  1842. return NULL;
  1843. init_waitqueue_head(&sfp->read_wait);
  1844. rwlock_init(&sfp->rq_list_lock);
  1845. kref_init(&sfp->f_ref);
  1846. sfp->timeout = SG_DEFAULT_TIMEOUT;
  1847. sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
  1848. sfp->force_packid = SG_DEF_FORCE_PACK_ID;
  1849. sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
  1850. sdp->device->host->unchecked_isa_dma : 1;
  1851. sfp->cmd_q = SG_DEF_COMMAND_Q;
  1852. sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
  1853. sfp->parentdp = sdp;
  1854. write_lock_irqsave(&sg_index_lock, iflags);
  1855. list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
  1856. write_unlock_irqrestore(&sg_index_lock, iflags);
  1857. SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
  1858. if (unlikely(sg_big_buff != def_reserved_size))
  1859. sg_big_buff = def_reserved_size;
  1860. bufflen = min_t(int, sg_big_buff,
  1861. queue_max_sectors(sdp->device->request_queue) * 512);
  1862. sg_build_reserve(sfp, bufflen);
  1863. SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
  1864. sfp->reserve.bufflen, sfp->reserve.k_use_sg));
  1865. kref_get(&sdp->d_ref);
  1866. __module_get(THIS_MODULE);
  1867. return sfp;
  1868. }
  1869. static void sg_remove_sfp_usercontext(struct work_struct *work)
  1870. {
  1871. struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
  1872. struct sg_device *sdp = sfp->parentdp;
  1873. /* Cleanup any responses which were never read(). */
  1874. while (sfp->headrp)
  1875. sg_finish_rem_req(sfp->headrp);
  1876. if (sfp->reserve.bufflen > 0) {
  1877. SCSI_LOG_TIMEOUT(6,
  1878. printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
  1879. (int) sfp->reserve.bufflen,
  1880. (int) sfp->reserve.k_use_sg));
  1881. sg_remove_scat(&sfp->reserve);
  1882. }
  1883. SCSI_LOG_TIMEOUT(6,
  1884. printk("sg_remove_sfp: %s, sfp=0x%p\n",
  1885. sdp->disk->disk_name,
  1886. sfp));
  1887. kfree(sfp);
  1888. scsi_device_put(sdp->device);
  1889. sg_put_dev(sdp);
  1890. module_put(THIS_MODULE);
  1891. }
  1892. static void sg_remove_sfp(struct kref *kref)
  1893. {
  1894. struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
  1895. struct sg_device *sdp = sfp->parentdp;
  1896. unsigned long iflags;
  1897. write_lock_irqsave(&sg_index_lock, iflags);
  1898. list_del(&sfp->sfd_siblings);
  1899. write_unlock_irqrestore(&sg_index_lock, iflags);
  1900. wake_up_interruptible(&sdp->o_excl_wait);
  1901. INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
  1902. schedule_work(&sfp->ew.work);
  1903. }
  1904. static int
  1905. sg_res_in_use(Sg_fd * sfp)
  1906. {
  1907. const Sg_request *srp;
  1908. unsigned long iflags;
  1909. read_lock_irqsave(&sfp->rq_list_lock, iflags);
  1910. for (srp = sfp->headrp; srp; srp = srp->nextrp)
  1911. if (srp->res_used)
  1912. break;
  1913. read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
  1914. return srp ? 1 : 0;
  1915. }
  1916. #ifdef CONFIG_SCSI_PROC_FS
  1917. static int
  1918. sg_idr_max_id(int id, void *p, void *data)
  1919. {
  1920. int *k = data;
  1921. if (*k < id)
  1922. *k = id;
  1923. return 0;
  1924. }
  1925. static int
  1926. sg_last_dev(void)
  1927. {
  1928. int k = -1;
  1929. unsigned long iflags;
  1930. read_lock_irqsave(&sg_index_lock, iflags);
  1931. idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
  1932. read_unlock_irqrestore(&sg_index_lock, iflags);
  1933. return k + 1; /* origin 1 */
  1934. }
  1935. #endif
  1936. /* must be called with sg_index_lock held */
  1937. static Sg_device *sg_lookup_dev(int dev)
  1938. {
  1939. return idr_find(&sg_index_idr, dev);
  1940. }
  1941. static Sg_device *sg_get_dev(int dev)
  1942. {
  1943. struct sg_device *sdp;
  1944. unsigned long flags;
  1945. read_lock_irqsave(&sg_index_lock, flags);
  1946. sdp = sg_lookup_dev(dev);
  1947. if (!sdp)
  1948. sdp = ERR_PTR(-ENXIO);
  1949. else if (sdp->detached) {
  1950. /* If sdp->detached, then the refcount may already be 0, in
  1951. * which case it would be a bug to do kref_get().
  1952. */
  1953. sdp = ERR_PTR(-ENODEV);
  1954. } else
  1955. kref_get(&sdp->d_ref);
  1956. read_unlock_irqrestore(&sg_index_lock, flags);
  1957. return sdp;
  1958. }
  1959. static void sg_put_dev(struct sg_device *sdp)
  1960. {
  1961. kref_put(&sdp->d_ref, sg_device_destroy);
  1962. }
  1963. #ifdef CONFIG_SCSI_PROC_FS
  1964. static struct proc_dir_entry *sg_proc_sgp = NULL;
  1965. static char sg_proc_sg_dirname[] = "scsi/sg";
  1966. static int sg_proc_seq_show_int(struct seq_file *s, void *v);
  1967. static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
  1968. static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
  1969. size_t count, loff_t *off);
  1970. static const struct file_operations adio_fops = {
  1971. .owner = THIS_MODULE,
  1972. .open = sg_proc_single_open_adio,
  1973. .read = seq_read,
  1974. .llseek = seq_lseek,
  1975. .write = sg_proc_write_adio,
  1976. .release = single_release,
  1977. };
  1978. static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
  1979. static ssize_t sg_proc_write_dressz(struct file *filp,
  1980. const char __user *buffer, size_t count, loff_t *off);
  1981. static const struct file_operations dressz_fops = {
  1982. .owner = THIS_MODULE,
  1983. .open = sg_proc_single_open_dressz,
  1984. .read = seq_read,
  1985. .llseek = seq_lseek,
  1986. .write = sg_proc_write_dressz,
  1987. .release = single_release,
  1988. };
  1989. static int sg_proc_seq_show_version(struct seq_file *s, void *v);
  1990. static int sg_proc_single_open_version(struct inode *inode, struct file *file);
  1991. static const struct file_operations version_fops = {
  1992. .owner = THIS_MODULE,
  1993. .open = sg_proc_single_open_version,
  1994. .read = seq_read,
  1995. .llseek = seq_lseek,
  1996. .release = single_release,
  1997. };
  1998. static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
  1999. static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
  2000. static const struct file_operations devhdr_fops = {
  2001. .owner = THIS_MODULE,
  2002. .open = sg_proc_single_open_devhdr,
  2003. .read = seq_read,
  2004. .llseek = seq_lseek,
  2005. .release = single_release,
  2006. };
  2007. static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
  2008. static int sg_proc_open_dev(struct inode *inode, struct file *file);
  2009. static void * dev_seq_start(struct seq_file *s, loff_t *pos);
  2010. static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
  2011. static void dev_seq_stop(struct seq_file *s, void *v);
  2012. static const struct file_operations dev_fops = {
  2013. .owner = THIS_MODULE,
  2014. .open = sg_proc_open_dev,
  2015. .read = seq_read,
  2016. .llseek = seq_lseek,
  2017. .release = seq_release,
  2018. };
  2019. static const struct seq_operations dev_seq_ops = {
  2020. .start = dev_seq_start,
  2021. .next = dev_seq_next,
  2022. .stop = dev_seq_stop,
  2023. .show = sg_proc_seq_show_dev,
  2024. };
  2025. static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
  2026. static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
  2027. static const struct file_operations devstrs_fops = {
  2028. .owner = THIS_MODULE,
  2029. .open = sg_proc_open_devstrs,
  2030. .read = seq_read,
  2031. .llseek = seq_lseek,
  2032. .release = seq_release,
  2033. };
  2034. static const struct seq_operations devstrs_seq_ops = {
  2035. .start = dev_seq_start,
  2036. .next = dev_seq_next,
  2037. .stop = dev_seq_stop,
  2038. .show = sg_proc_seq_show_devstrs,
  2039. };
  2040. static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
  2041. static int sg_proc_open_debug(struct inode *inode, struct file *file);
  2042. static const struct file_operations debug_fops = {
  2043. .owner = THIS_MODULE,
  2044. .open = sg_proc_open_debug,
  2045. .read = seq_read,
  2046. .llseek = seq_lseek,
  2047. .release = seq_release,
  2048. };
  2049. static const struct seq_operations debug_seq_ops = {
  2050. .start = dev_seq_start,
  2051. .next = dev_seq_next,
  2052. .stop = dev_seq_stop,
  2053. .show = sg_proc_seq_show_debug,
  2054. };
  2055. struct sg_proc_leaf {
  2056. const char * name;
  2057. const struct file_operations * fops;
  2058. };
  2059. static struct sg_proc_leaf sg_proc_leaf_arr[] = {
  2060. {"allow_dio", &adio_fops},
  2061. {"debug", &debug_fops},
  2062. {"def_reserved_size", &dressz_fops},
  2063. {"device_hdr", &devhdr_fops},
  2064. {"devices", &dev_fops},
  2065. {"device_strs", &devstrs_fops},
  2066. {"version", &version_fops}
  2067. };
  2068. static int
  2069. sg_proc_init(void)
  2070. {
  2071. int k, mask;
  2072. int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
  2073. struct sg_proc_leaf * leaf;
  2074. sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
  2075. if (!sg_proc_sgp)
  2076. return 1;
  2077. for (k = 0; k < num_leaves; ++k) {
  2078. leaf = &sg_proc_leaf_arr[k];
  2079. mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
  2080. proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
  2081. }
  2082. return 0;
  2083. }
  2084. static void
  2085. sg_proc_cleanup(void)
  2086. {
  2087. int k;
  2088. int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
  2089. if (!sg_proc_sgp)
  2090. return;
  2091. for (k = 0; k < num_leaves; ++k)
  2092. remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
  2093. remove_proc_entry(sg_proc_sg_dirname, NULL);
  2094. }
  2095. static int sg_proc_seq_show_int(struct seq_file *s, void *v)
  2096. {
  2097. seq_printf(s, "%d\n", *((int *)s->private));
  2098. return 0;
  2099. }
  2100. static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
  2101. {
  2102. return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
  2103. }
  2104. static ssize_t
  2105. sg_proc_write_adio(struct file *filp, const char __user *buffer,
  2106. size_t count, loff_t *off)
  2107. {
  2108. int num;
  2109. char buff[11];
  2110. if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
  2111. return -EACCES;
  2112. num = (count < 10) ? count : 10;
  2113. if (copy_from_user(buff, buffer, num))
  2114. return -EFAULT;
  2115. buff[num] = '\0';
  2116. sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
  2117. return count;
  2118. }
  2119. static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
  2120. {
  2121. return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
  2122. }
  2123. static ssize_t
  2124. sg_proc_write_dressz(struct file *filp, const char __user *buffer,
  2125. size_t count, loff_t *off)
  2126. {
  2127. int num;
  2128. unsigned long k = ULONG_MAX;
  2129. char buff[11];
  2130. if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
  2131. return -EACCES;
  2132. num = (count < 10) ? count : 10;
  2133. if (copy_from_user(buff, buffer, num))
  2134. return -EFAULT;
  2135. buff[num] = '\0';
  2136. k = simple_strtoul(buff, NULL, 10);
  2137. if (k <= 1048576) { /* limit "big buff" to 1 MB */
  2138. sg_big_buff = k;
  2139. return count;
  2140. }
  2141. return -ERANGE;
  2142. }
  2143. static int sg_proc_seq_show_version(struct seq_file *s, void *v)
  2144. {
  2145. seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
  2146. sg_version_date);
  2147. return 0;
  2148. }
  2149. static int sg_proc_single_open_version(struct inode *inode, struct file *file)
  2150. {
  2151. return single_open(file, sg_proc_seq_show_version, NULL);
  2152. }
  2153. static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
  2154. {
  2155. seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
  2156. "online\n");
  2157. return 0;
  2158. }
  2159. static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
  2160. {
  2161. return single_open(file, sg_proc_seq_show_devhdr, NULL);
  2162. }
  2163. struct sg_proc_deviter {
  2164. loff_t index;
  2165. size_t max;
  2166. };
  2167. static void * dev_seq_start(struct seq_file *s, loff_t *pos)
  2168. {
  2169. struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
  2170. s->private = it;
  2171. if (! it)
  2172. return NULL;
  2173. it->index = *pos;
  2174. it->max = sg_last_dev();
  2175. if (it->index >= it->max)
  2176. return NULL;
  2177. return it;
  2178. }
  2179. static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
  2180. {
  2181. struct sg_proc_deviter * it = s->private;
  2182. *pos = ++it->index;
  2183. return (it->index < it->max) ? it : NULL;
  2184. }
  2185. static void dev_seq_stop(struct seq_file *s, void *v)
  2186. {
  2187. kfree(s->private);
  2188. }
  2189. static int sg_proc_open_dev(struct inode *inode, struct file *file)
  2190. {
  2191. return seq_open(file, &dev_seq_ops);
  2192. }
  2193. static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
  2194. {
  2195. struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
  2196. Sg_device *sdp;
  2197. struct scsi_device *scsidp;
  2198. unsigned long iflags;
  2199. read_lock_irqsave(&sg_index_lock, iflags);
  2200. sdp = it ? sg_lookup_dev(it->index) : NULL;
  2201. if (sdp && (scsidp = sdp->device) && (!sdp->detached))
  2202. seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
  2203. scsidp->host->host_no, scsidp->channel,
  2204. scsidp->id, scsidp->lun, (int) scsidp->type,
  2205. 1,
  2206. (int) scsidp->queue_depth,
  2207. (int) scsidp->device_busy,
  2208. (int) scsi_device_online(scsidp));
  2209. else
  2210. seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
  2211. read_unlock_irqrestore(&sg_index_lock, iflags);
  2212. return 0;
  2213. }
  2214. static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
  2215. {
  2216. return seq_open(file, &devstrs_seq_ops);
  2217. }
  2218. static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
  2219. {
  2220. struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
  2221. Sg_device *sdp;
  2222. struct scsi_device *scsidp;
  2223. unsigned long iflags;
  2224. read_lock_irqsave(&sg_index_lock, iflags);
  2225. sdp = it ? sg_lookup_dev(it->index) : NULL;
  2226. if (sdp && (scsidp = sdp->device) && (!sdp->detached))
  2227. seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
  2228. scsidp->vendor, scsidp->model, scsidp->rev);
  2229. else
  2230. seq_printf(s, "<no active device>\n");
  2231. read_unlock_irqrestore(&sg_index_lock, iflags);
  2232. return 0;
  2233. }
  2234. /* must be called while holding sg_index_lock */
  2235. static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
  2236. {
  2237. int k, m, new_interface, blen, usg;
  2238. Sg_request *srp;
  2239. Sg_fd *fp;
  2240. const sg_io_hdr_t *hp;
  2241. const char * cp;
  2242. unsigned int ms;
  2243. k = 0;
  2244. list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
  2245. k++;
  2246. read_lock(&fp->rq_list_lock); /* irqs already disabled */
  2247. seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
  2248. "(res)sgat=%d low_dma=%d\n", k,
  2249. jiffies_to_msecs(fp->timeout),
  2250. fp->reserve.bufflen,
  2251. (int) fp->reserve.k_use_sg,
  2252. (int) fp->low_dma);
  2253. seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
  2254. (int) fp->cmd_q, (int) fp->force_packid,
  2255. (int) fp->keep_orphan, (int) fp->closed);
  2256. for (m = 0, srp = fp->headrp;
  2257. srp != NULL;
  2258. ++m, srp = srp->nextrp) {
  2259. hp = &srp->header;
  2260. new_interface = (hp->interface_id == '\0') ? 0 : 1;
  2261. if (srp->res_used) {
  2262. if (new_interface &&
  2263. (SG_FLAG_MMAP_IO & hp->flags))
  2264. cp = " mmap>> ";
  2265. else
  2266. cp = " rb>> ";
  2267. } else {
  2268. if (SG_INFO_DIRECT_IO_MASK & hp->info)
  2269. cp = " dio>> ";
  2270. else
  2271. cp = " ";
  2272. }
  2273. seq_printf(s, cp);
  2274. blen = srp->data.bufflen;
  2275. usg = srp->data.k_use_sg;
  2276. seq_printf(s, srp->done ?
  2277. ((1 == srp->done) ? "rcv:" : "fin:")
  2278. : "act:");
  2279. seq_printf(s, " id=%d blen=%d",
  2280. srp->header.pack_id, blen);
  2281. if (srp->done)
  2282. seq_printf(s, " dur=%d", hp->duration);
  2283. else {
  2284. ms = jiffies_to_msecs(jiffies);
  2285. seq_printf(s, " t_o/elap=%d/%d",
  2286. (new_interface ? hp->timeout :
  2287. jiffies_to_msecs(fp->timeout)),
  2288. (ms > hp->duration ? ms - hp->duration : 0));
  2289. }
  2290. seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
  2291. (int) srp->data.cmd_opcode);
  2292. }
  2293. if (0 == m)
  2294. seq_printf(s, " No requests active\n");
  2295. read_unlock(&fp->rq_list_lock);
  2296. }
  2297. }
  2298. static int sg_proc_open_debug(struct inode *inode, struct file *file)
  2299. {
  2300. return seq_open(file, &debug_seq_ops);
  2301. }
  2302. static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
  2303. {
  2304. struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
  2305. Sg_device *sdp;
  2306. unsigned long iflags;
  2307. if (it && (0 == it->index)) {
  2308. seq_printf(s, "max_active_device=%d(origin 1)\n",
  2309. (int)it->max);
  2310. seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
  2311. }
  2312. read_lock_irqsave(&sg_index_lock, iflags);
  2313. sdp = it ? sg_lookup_dev(it->index) : NULL;
  2314. if (sdp && !list_empty(&sdp->sfds)) {
  2315. struct scsi_device *scsidp = sdp->device;
  2316. seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
  2317. if (sdp->detached)
  2318. seq_printf(s, "detached pending close ");
  2319. else
  2320. seq_printf
  2321. (s, "scsi%d chan=%d id=%d lun=%d em=%d",
  2322. scsidp->host->host_no,
  2323. scsidp->channel, scsidp->id,
  2324. scsidp->lun,
  2325. scsidp->host->hostt->emulated);
  2326. seq_printf(s, " sg_tablesize=%d excl=%d\n",
  2327. sdp->sg_tablesize, sdp->exclude);
  2328. sg_proc_debug_helper(s, sdp);
  2329. }
  2330. read_unlock_irqrestore(&sg_index_lock, iflags);
  2331. return 0;
  2332. }
  2333. #endif /* CONFIG_SCSI_PROC_FS */
  2334. module_init(init_sg);
  2335. module_exit(exit_sg);