| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * History: |
| 4 | * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), |
| 5 | * to allow user process control of SCSI devices. |
| 6 | * Development Sponsored by Killy Corp. NY NY |
| 7 | * |
| 8 | * Original driver (sg.c): |
| 9 | * Copyright (C) 1992 Lawrence Foard |
| 10 | * Version 2 and 3 extensions to driver: |
| 11 | * Copyright (C) 1998 - 2014 Douglas Gilbert |
| 12 | */ |
| 13 | |
| 14 | static int sg_version_num = 30536; /* 2 digits for each component */ |
| 15 | #define SG_VERSION_STR "3.5.36" |
| 16 | |
| 17 | /* |
| 18 | * D. P. Gilbert (dgilbert@interlog.com), notes: |
| 19 | * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First |
| 20 | * the kernel/module needs to be built with CONFIG_SCSI_LOGGING |
| 21 | * (otherwise the macros compile to empty statements). |
| 22 | * |
| 23 | */ |
| 24 | #include <linux/module.h> |
| 25 | |
| 26 | #include <linux/fs.h> |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/sched.h> |
| 29 | #include <linux/string.h> |
| 30 | #include <linux/mm.h> |
| 31 | #include <linux/errno.h> |
| 32 | #include <linux/mtio.h> |
| 33 | #include <linux/ioctl.h> |
| 34 | #include <linux/slab.h> |
| 35 | #include <linux/fcntl.h> |
| 36 | #include <linux/init.h> |
| 37 | #include <linux/poll.h> |
| 38 | #include <linux/moduleparam.h> |
| 39 | #include <linux/cdev.h> |
| 40 | #include <linux/idr.h> |
| 41 | #include <linux/seq_file.h> |
| 42 | #include <linux/blkdev.h> |
| 43 | #include <linux/delay.h> |
| 44 | #include <linux/blktrace_api.h> |
| 45 | #include <linux/mutex.h> |
| 46 | #include <linux/atomic.h> |
| 47 | #include <linux/ratelimit.h> |
| 48 | #include <linux/uio.h> |
| 49 | #include <linux/cred.h> /* for sg_check_file_access() */ |
| 50 | |
| 51 | #include "scsi.h" |
| 52 | #include <scsi/scsi_dbg.h> |
| 53 | #include <scsi/scsi_host.h> |
| 54 | #include <scsi/scsi_driver.h> |
| 55 | #include <scsi/scsi_ioctl.h> |
| 56 | #include <scsi/sg.h> |
| 57 | |
| 58 | #include "scsi_logging.h" |
| 59 | |
| 60 | #ifdef CONFIG_SCSI_PROC_FS |
| 61 | #include <linux/proc_fs.h> |
| 62 | static char *sg_version_date = "20140603"; |
| 63 | |
| 64 | static int sg_proc_init(void); |
| 65 | #endif |
| 66 | |
| 67 | #define SG_ALLOW_DIO_DEF 0 |
| 68 | |
| 69 | #define SG_MAX_DEVS 32768 |
| 70 | |
| 71 | /* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type |
| 72 | * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater |
| 73 | * than 16 bytes are "variable length" whose length is a multiple of 4 |
| 74 | */ |
| 75 | #define SG_MAX_CDB_SIZE 252 |
| 76 | |
| 77 | #define SG_DEFAULT_TIMEOUT mult_frac(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) |
| 78 | |
| 79 | int sg_big_buff = SG_DEF_RESERVED_SIZE; |
| 80 | /* N.B. This variable is readable and writeable via |
| 81 | /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer |
| 82 | of this size (or less if there is not enough memory) will be reserved |
| 83 | for use by this file descriptor. [Deprecated usage: this variable is also |
| 84 | readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into |
| 85 | the kernel (i.e. it is not a module).] */ |
| 86 | static int def_reserved_size = -1; /* picks up init parameter */ |
| 87 | static int sg_allow_dio = SG_ALLOW_DIO_DEF; |
| 88 | |
| 89 | static int scatter_elem_sz = SG_SCATTER_SZ; |
| 90 | static int scatter_elem_sz_prev = SG_SCATTER_SZ; |
| 91 | |
| 92 | #define SG_SECTOR_SZ 512 |
| 93 | |
| 94 | static int sg_add_device(struct device *, struct class_interface *); |
| 95 | static void sg_remove_device(struct device *, struct class_interface *); |
| 96 | |
| 97 | static DEFINE_IDR(sg_index_idr); |
| 98 | static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock |
| 99 | file descriptor list for device */ |
| 100 | |
| 101 | static struct class_interface sg_interface = { |
| 102 | .add_dev = sg_add_device, |
| 103 | .remove_dev = sg_remove_device, |
| 104 | }; |
| 105 | |
| 106 | typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ |
| 107 | unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ |
| 108 | unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ |
| 109 | unsigned bufflen; /* Size of (aggregate) data buffer */ |
| 110 | struct page **pages; |
| 111 | int page_order; |
| 112 | char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ |
| 113 | unsigned char cmd_opcode; /* first byte of command */ |
| 114 | } Sg_scatter_hold; |
| 115 | |
| 116 | struct sg_device; /* forward declarations */ |
| 117 | struct sg_fd; |
| 118 | |
| 119 | typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ |
| 120 | struct list_head entry; /* list entry */ |
| 121 | struct sg_fd *parentfp; /* NULL -> not in use */ |
| 122 | Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ |
| 123 | sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ |
| 124 | unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; |
| 125 | char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ |
| 126 | char orphan; /* 1 -> drop on sight, 0 -> normal */ |
| 127 | char sg_io_owned; /* 1 -> packet belongs to SG_IO */ |
| 128 | /* done protected by rq_list_lock */ |
| 129 | char done; /* 0->before bh, 1->before read, 2->read */ |
| 130 | struct request *rq; |
| 131 | struct bio *bio; |
| 132 | struct execute_work ew; |
| 133 | } Sg_request; |
| 134 | |
| 135 | typedef struct sg_fd { /* holds the state of a file descriptor */ |
| 136 | struct list_head sfd_siblings; /* protected by device's sfd_lock */ |
| 137 | struct sg_device *parentdp; /* owning device */ |
| 138 | wait_queue_head_t read_wait; /* queue read until command done */ |
| 139 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ |
| 140 | struct mutex f_mutex; /* protect against changes in this fd */ |
| 141 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ |
| 142 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ |
| 143 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ |
| 144 | struct list_head rq_list; /* head of request list */ |
| 145 | struct fasync_struct *async_qp; /* used by asynchronous notification */ |
| 146 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ |
| 147 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ |
| 148 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ |
| 149 | unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */ |
| 150 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ |
| 151 | char mmap_called; /* 0 -> mmap() never called on this fd */ |
| 152 | char res_in_use; /* 1 -> 'reserve' array in use */ |
| 153 | struct kref f_ref; |
| 154 | struct execute_work ew; |
| 155 | } Sg_fd; |
| 156 | |
| 157 | typedef struct sg_device { /* holds the state of each scsi generic device */ |
| 158 | struct scsi_device *device; |
| 159 | wait_queue_head_t open_wait; /* queue open() when O_EXCL present */ |
| 160 | struct mutex open_rel_lock; /* held when in open() or release() */ |
| 161 | int sg_tablesize; /* adapter's max scatter-gather table size */ |
| 162 | u32 index; /* device index number */ |
| 163 | struct list_head sfds; |
| 164 | rwlock_t sfd_lock; /* protect access to sfd list */ |
| 165 | atomic_t detaching; /* 0->device usable, 1->device detaching */ |
| 166 | bool exclude; /* 1->open(O_EXCL) succeeded and is active */ |
| 167 | int open_cnt; /* count of opens (perhaps < num(sfds) ) */ |
| 168 | char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ |
| 169 | char name[DISK_NAME_LEN]; |
| 170 | struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ |
| 171 | struct kref d_ref; |
| 172 | } Sg_device; |
| 173 | |
| 174 | /* tasklet or soft irq callback */ |
| 175 | static void sg_rq_end_io(struct request *rq, blk_status_t status); |
| 176 | static int sg_start_req(Sg_request *srp, unsigned char *cmd); |
| 177 | static int sg_finish_rem_req(Sg_request * srp); |
| 178 | static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); |
| 179 | static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, |
| 180 | Sg_request * srp); |
| 181 | static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, |
| 182 | const char __user *buf, size_t count, int blocking, |
| 183 | int read_only, int sg_io_owned, Sg_request **o_srp); |
| 184 | static int sg_common_write(Sg_fd * sfp, Sg_request * srp, |
| 185 | unsigned char *cmnd, int timeout, int blocking); |
| 186 | static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); |
| 187 | static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp); |
| 188 | static void sg_build_reserve(Sg_fd * sfp, int req_size); |
| 189 | static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); |
| 190 | static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); |
| 191 | static Sg_fd *sg_add_sfp(Sg_device * sdp); |
| 192 | static void sg_remove_sfp(struct kref *); |
| 193 | static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); |
| 194 | static Sg_request *sg_add_request(Sg_fd * sfp); |
| 195 | static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); |
| 196 | static Sg_device *sg_get_dev(int dev); |
| 197 | static void sg_device_destroy(struct kref *kref); |
| 198 | |
| 199 | #define SZ_SG_HEADER sizeof(struct sg_header) |
| 200 | #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) |
| 201 | #define SZ_SG_IOVEC sizeof(sg_iovec_t) |
| 202 | #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) |
| 203 | |
| 204 | #define sg_printk(prefix, sdp, fmt, a...) \ |
| 205 | sdev_prefix_printk(prefix, (sdp)->device, (sdp)->name, fmt, ##a) |
| 206 | |
| 207 | /* |
| 208 | * The SCSI interfaces that use read() and write() as an asynchronous variant of |
| 209 | * ioctl(..., SG_IO, ...) are fundamentally unsafe, since there are lots of ways |
| 210 | * to trigger read() and write() calls from various contexts with elevated |
| 211 | * privileges. This can lead to kernel memory corruption (e.g. if these |
| 212 | * interfaces are called through splice()) and privilege escalation inside |
| 213 | * userspace (e.g. if a process with access to such a device passes a file |
| 214 | * descriptor to a SUID binary as stdin/stdout/stderr). |
| 215 | * |
| 216 | * This function provides protection for the legacy API by restricting the |
| 217 | * calling context. |
| 218 | */ |
| 219 | static int sg_check_file_access(struct file *filp, const char *caller) |
| 220 | { |
| 221 | if (filp->f_cred != current_real_cred()) { |
| 222 | pr_err_once("%s: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n", |
| 223 | caller, task_tgid_vnr(current), current->comm); |
| 224 | return -EPERM; |
| 225 | } |
| 226 | if (uaccess_kernel()) { |
| 227 | pr_err_once("%s: process %d (%s) called from kernel context, this is not allowed.\n", |
| 228 | caller, task_tgid_vnr(current), current->comm); |
| 229 | return -EACCES; |
| 230 | } |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | static int sg_allow_access(struct file *filp, unsigned char *cmd) |
| 235 | { |
| 236 | struct sg_fd *sfp = filp->private_data; |
| 237 | |
| 238 | if (sfp->parentdp->device->type == TYPE_SCANNER) |
| 239 | return 0; |
| 240 | |
| 241 | return blk_verify_command(cmd, filp->f_mode); |
| 242 | } |
| 243 | |
| 244 | static int |
| 245 | open_wait(Sg_device *sdp, int flags) |
| 246 | { |
| 247 | int retval = 0; |
| 248 | |
| 249 | if (flags & O_EXCL) { |
| 250 | while (sdp->open_cnt > 0) { |
| 251 | mutex_unlock(&sdp->open_rel_lock); |
| 252 | retval = wait_event_interruptible(sdp->open_wait, |
| 253 | (atomic_read(&sdp->detaching) || |
| 254 | !sdp->open_cnt)); |
| 255 | mutex_lock(&sdp->open_rel_lock); |
| 256 | |
| 257 | if (retval) /* -ERESTARTSYS */ |
| 258 | return retval; |
| 259 | if (atomic_read(&sdp->detaching)) |
| 260 | return -ENODEV; |
| 261 | } |
| 262 | } else { |
| 263 | while (sdp->exclude) { |
| 264 | mutex_unlock(&sdp->open_rel_lock); |
| 265 | retval = wait_event_interruptible(sdp->open_wait, |
| 266 | (atomic_read(&sdp->detaching) || |
| 267 | !sdp->exclude)); |
| 268 | mutex_lock(&sdp->open_rel_lock); |
| 269 | |
| 270 | if (retval) /* -ERESTARTSYS */ |
| 271 | return retval; |
| 272 | if (atomic_read(&sdp->detaching)) |
| 273 | return -ENODEV; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | return retval; |
| 278 | } |
| 279 | |
| 280 | /* Returns 0 on success, else a negated errno value */ |
| 281 | static int |
| 282 | sg_open(struct inode *inode, struct file *filp) |
| 283 | { |
| 284 | int dev = iminor(inode); |
| 285 | int flags = filp->f_flags; |
| 286 | struct request_queue *q; |
| 287 | Sg_device *sdp; |
| 288 | Sg_fd *sfp; |
| 289 | int retval; |
| 290 | |
| 291 | nonseekable_open(inode, filp); |
| 292 | if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) |
| 293 | return -EPERM; /* Can't lock it with read only access */ |
| 294 | sdp = sg_get_dev(dev); |
| 295 | if (IS_ERR(sdp)) |
| 296 | return PTR_ERR(sdp); |
| 297 | |
| 298 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 299 | "sg_open: flags=0x%x\n", flags)); |
| 300 | |
| 301 | /* This driver's module count bumped by fops_get in <linux/fs.h> */ |
| 302 | /* Prevent the device driver from vanishing while we sleep */ |
| 303 | retval = scsi_device_get(sdp->device); |
| 304 | if (retval) |
| 305 | goto sg_put; |
| 306 | |
| 307 | retval = scsi_autopm_get_device(sdp->device); |
| 308 | if (retval) |
| 309 | goto sdp_put; |
| 310 | |
| 311 | /* scsi_block_when_processing_errors() may block so bypass |
| 312 | * check if O_NONBLOCK. Permits SCSI commands to be issued |
| 313 | * during error recovery. Tread carefully. */ |
| 314 | if (!((flags & O_NONBLOCK) || |
| 315 | scsi_block_when_processing_errors(sdp->device))) { |
| 316 | retval = -ENXIO; |
| 317 | /* we are in error recovery for this device */ |
| 318 | goto error_out; |
| 319 | } |
| 320 | |
| 321 | mutex_lock(&sdp->open_rel_lock); |
| 322 | if (flags & O_NONBLOCK) { |
| 323 | if (flags & O_EXCL) { |
| 324 | if (sdp->open_cnt > 0) { |
| 325 | retval = -EBUSY; |
| 326 | goto error_mutex_locked; |
| 327 | } |
| 328 | } else { |
| 329 | if (sdp->exclude) { |
| 330 | retval = -EBUSY; |
| 331 | goto error_mutex_locked; |
| 332 | } |
| 333 | } |
| 334 | } else { |
| 335 | retval = open_wait(sdp, flags); |
| 336 | if (retval) /* -ERESTARTSYS or -ENODEV */ |
| 337 | goto error_mutex_locked; |
| 338 | } |
| 339 | |
| 340 | /* N.B. at this point we are holding the open_rel_lock */ |
| 341 | if (flags & O_EXCL) |
| 342 | sdp->exclude = true; |
| 343 | |
| 344 | if (sdp->open_cnt < 1) { /* no existing opens */ |
| 345 | sdp->sgdebug = 0; |
| 346 | q = sdp->device->request_queue; |
| 347 | sdp->sg_tablesize = queue_max_segments(q); |
| 348 | } |
| 349 | sfp = sg_add_sfp(sdp); |
| 350 | if (IS_ERR(sfp)) { |
| 351 | retval = PTR_ERR(sfp); |
| 352 | goto out_undo; |
| 353 | } |
| 354 | |
| 355 | filp->private_data = sfp; |
| 356 | sdp->open_cnt++; |
| 357 | mutex_unlock(&sdp->open_rel_lock); |
| 358 | |
| 359 | retval = 0; |
| 360 | sg_put: |
| 361 | kref_put(&sdp->d_ref, sg_device_destroy); |
| 362 | return retval; |
| 363 | |
| 364 | out_undo: |
| 365 | if (flags & O_EXCL) { |
| 366 | sdp->exclude = false; /* undo if error */ |
| 367 | wake_up_interruptible(&sdp->open_wait); |
| 368 | } |
| 369 | error_mutex_locked: |
| 370 | mutex_unlock(&sdp->open_rel_lock); |
| 371 | error_out: |
| 372 | scsi_autopm_put_device(sdp->device); |
| 373 | sdp_put: |
| 374 | scsi_device_put(sdp->device); |
| 375 | goto sg_put; |
| 376 | } |
| 377 | |
| 378 | /* Release resources associated with a successful sg_open() |
| 379 | * Returns 0 on success, else a negated errno value */ |
| 380 | static int |
| 381 | sg_release(struct inode *inode, struct file *filp) |
| 382 | { |
| 383 | Sg_device *sdp; |
| 384 | Sg_fd *sfp; |
| 385 | |
| 386 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| 387 | return -ENXIO; |
| 388 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n")); |
| 389 | |
| 390 | mutex_lock(&sdp->open_rel_lock); |
| 391 | scsi_autopm_put_device(sdp->device); |
| 392 | kref_put(&sfp->f_ref, sg_remove_sfp); |
| 393 | sdp->open_cnt--; |
| 394 | |
| 395 | /* possibly many open()s waiting on exlude clearing, start many; |
| 396 | * only open(O_EXCL)s wait on 0==open_cnt so only start one */ |
| 397 | if (sdp->exclude) { |
| 398 | sdp->exclude = false; |
| 399 | wake_up_interruptible_all(&sdp->open_wait); |
| 400 | } else if (0 == sdp->open_cnt) { |
| 401 | wake_up_interruptible(&sdp->open_wait); |
| 402 | } |
| 403 | mutex_unlock(&sdp->open_rel_lock); |
| 404 | return 0; |
| 405 | } |
| 406 | |
| 407 | static int get_sg_io_pack_id(int *pack_id, void __user *buf, size_t count) |
| 408 | { |
| 409 | struct sg_header __user *old_hdr = buf; |
| 410 | int reply_len; |
| 411 | |
| 412 | if (count >= SZ_SG_HEADER) { |
| 413 | /* negative reply_len means v3 format, otherwise v1/v2 */ |
| 414 | if (get_user(reply_len, &old_hdr->reply_len)) |
| 415 | return -EFAULT; |
| 416 | |
| 417 | if (reply_len >= 0) |
| 418 | return get_user(*pack_id, &old_hdr->pack_id); |
| 419 | |
| 420 | if (in_compat_syscall() && |
| 421 | count >= sizeof(struct compat_sg_io_hdr)) { |
| 422 | struct compat_sg_io_hdr __user *hp = buf; |
| 423 | |
| 424 | return get_user(*pack_id, &hp->pack_id); |
| 425 | } |
| 426 | |
| 427 | if (count >= sizeof(struct sg_io_hdr)) { |
| 428 | struct sg_io_hdr __user *hp = buf; |
| 429 | |
| 430 | return get_user(*pack_id, &hp->pack_id); |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | /* no valid header was passed, so ignore the pack_id */ |
| 435 | *pack_id = -1; |
| 436 | return 0; |
| 437 | } |
| 438 | |
| 439 | static ssize_t |
| 440 | sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) |
| 441 | { |
| 442 | Sg_device *sdp; |
| 443 | Sg_fd *sfp; |
| 444 | Sg_request *srp; |
| 445 | int req_pack_id = -1; |
| 446 | sg_io_hdr_t *hp; |
| 447 | struct sg_header *old_hdr; |
| 448 | int retval; |
| 449 | |
| 450 | /* |
| 451 | * This could cause a response to be stranded. Close the associated |
| 452 | * file descriptor to free up any resources being held. |
| 453 | */ |
| 454 | retval = sg_check_file_access(filp, __func__); |
| 455 | if (retval) |
| 456 | return retval; |
| 457 | |
| 458 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| 459 | return -ENXIO; |
| 460 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 461 | "sg_read: count=%d\n", (int) count)); |
| 462 | |
| 463 | if (sfp->force_packid) |
| 464 | retval = get_sg_io_pack_id(&req_pack_id, buf, count); |
| 465 | if (retval) |
| 466 | return retval; |
| 467 | |
| 468 | srp = sg_get_rq_mark(sfp, req_pack_id); |
| 469 | if (!srp) { /* now wait on packet to arrive */ |
| 470 | if (atomic_read(&sdp->detaching)) |
| 471 | return -ENODEV; |
| 472 | if (filp->f_flags & O_NONBLOCK) |
| 473 | return -EAGAIN; |
| 474 | retval = wait_event_interruptible(sfp->read_wait, |
| 475 | (atomic_read(&sdp->detaching) || |
| 476 | (srp = sg_get_rq_mark(sfp, req_pack_id)))); |
| 477 | if (atomic_read(&sdp->detaching)) |
| 478 | return -ENODEV; |
| 479 | if (retval) |
| 480 | /* -ERESTARTSYS as signal hit process */ |
| 481 | return retval; |
| 482 | } |
| 483 | if (srp->header.interface_id != '\0') |
| 484 | return sg_new_read(sfp, buf, count, srp); |
| 485 | |
| 486 | hp = &srp->header; |
| 487 | old_hdr = kzalloc(SZ_SG_HEADER, GFP_KERNEL); |
| 488 | if (!old_hdr) |
| 489 | return -ENOMEM; |
| 490 | |
| 491 | old_hdr->reply_len = (int) hp->timeout; |
| 492 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ |
| 493 | old_hdr->pack_id = hp->pack_id; |
| 494 | old_hdr->twelve_byte = |
| 495 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
| 496 | old_hdr->target_status = hp->masked_status; |
| 497 | old_hdr->host_status = hp->host_status; |
| 498 | old_hdr->driver_status = hp->driver_status; |
| 499 | if ((CHECK_CONDITION & hp->masked_status) || |
| 500 | (srp->sense_b[0] & 0x70) == 0x70) { |
| 501 | old_hdr->driver_status = DRIVER_SENSE; |
| 502 | memcpy(old_hdr->sense_buffer, srp->sense_b, |
| 503 | sizeof (old_hdr->sense_buffer)); |
| 504 | } |
| 505 | switch (hp->host_status) { |
| 506 | /* This setup of 'result' is for backward compatibility and is best |
| 507 | ignored by the user who should use target, host + driver status */ |
| 508 | case DID_OK: |
| 509 | case DID_PASSTHROUGH: |
| 510 | case DID_SOFT_ERROR: |
| 511 | old_hdr->result = 0; |
| 512 | break; |
| 513 | case DID_NO_CONNECT: |
| 514 | case DID_BUS_BUSY: |
| 515 | case DID_TIME_OUT: |
| 516 | old_hdr->result = EBUSY; |
| 517 | break; |
| 518 | case DID_BAD_TARGET: |
| 519 | case DID_ABORT: |
| 520 | case DID_PARITY: |
| 521 | case DID_RESET: |
| 522 | case DID_BAD_INTR: |
| 523 | old_hdr->result = EIO; |
| 524 | break; |
| 525 | case DID_ERROR: |
| 526 | old_hdr->result = (srp->sense_b[0] == 0 && |
| 527 | hp->masked_status == GOOD) ? 0 : EIO; |
| 528 | break; |
| 529 | default: |
| 530 | old_hdr->result = EIO; |
| 531 | break; |
| 532 | } |
| 533 | |
| 534 | /* Now copy the result back to the user buffer. */ |
| 535 | if (count >= SZ_SG_HEADER) { |
| 536 | if (copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
| 537 | retval = -EFAULT; |
| 538 | goto free_old_hdr; |
| 539 | } |
| 540 | buf += SZ_SG_HEADER; |
| 541 | if (count > old_hdr->reply_len) |
| 542 | count = old_hdr->reply_len; |
| 543 | if (count > SZ_SG_HEADER) { |
| 544 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
| 545 | retval = -EFAULT; |
| 546 | goto free_old_hdr; |
| 547 | } |
| 548 | } |
| 549 | } else |
| 550 | count = (old_hdr->result == 0) ? 0 : -EIO; |
| 551 | sg_finish_rem_req(srp); |
| 552 | sg_remove_request(sfp, srp); |
| 553 | retval = count; |
| 554 | free_old_hdr: |
| 555 | kfree(old_hdr); |
| 556 | return retval; |
| 557 | } |
| 558 | |
| 559 | static ssize_t |
| 560 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) |
| 561 | { |
| 562 | sg_io_hdr_t *hp = &srp->header; |
| 563 | int err = 0, err2; |
| 564 | int len; |
| 565 | |
| 566 | if (in_compat_syscall()) { |
| 567 | if (count < sizeof(struct compat_sg_io_hdr)) { |
| 568 | err = -EINVAL; |
| 569 | goto err_out; |
| 570 | } |
| 571 | } else if (count < SZ_SG_IO_HDR) { |
| 572 | err = -EINVAL; |
| 573 | goto err_out; |
| 574 | } |
| 575 | hp->sb_len_wr = 0; |
| 576 | if ((hp->mx_sb_len > 0) && hp->sbp) { |
| 577 | if ((CHECK_CONDITION & hp->masked_status) || |
| 578 | (srp->sense_b[0] & 0x70) == 0x70) { |
| 579 | int sb_len = SCSI_SENSE_BUFFERSIZE; |
| 580 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; |
| 581 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ |
| 582 | len = (len > sb_len) ? sb_len : len; |
| 583 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { |
| 584 | err = -EFAULT; |
| 585 | goto err_out; |
| 586 | } |
| 587 | hp->driver_status = DRIVER_SENSE; |
| 588 | hp->sb_len_wr = len; |
| 589 | } |
| 590 | } |
| 591 | if (hp->masked_status || hp->host_status || hp->driver_status) |
| 592 | hp->info |= SG_INFO_CHECK; |
| 593 | err = put_sg_io_hdr(hp, buf); |
| 594 | err_out: |
| 595 | err2 = sg_finish_rem_req(srp); |
| 596 | sg_remove_request(sfp, srp); |
| 597 | return err ? : err2 ? : count; |
| 598 | } |
| 599 | |
| 600 | static ssize_t |
| 601 | sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) |
| 602 | { |
| 603 | int mxsize, cmd_size, k; |
| 604 | int input_size, blocking; |
| 605 | unsigned char opcode; |
| 606 | Sg_device *sdp; |
| 607 | Sg_fd *sfp; |
| 608 | Sg_request *srp; |
| 609 | struct sg_header old_hdr; |
| 610 | sg_io_hdr_t *hp; |
| 611 | unsigned char cmnd[SG_MAX_CDB_SIZE]; |
| 612 | int retval; |
| 613 | |
| 614 | retval = sg_check_file_access(filp, __func__); |
| 615 | if (retval) |
| 616 | return retval; |
| 617 | |
| 618 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| 619 | return -ENXIO; |
| 620 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 621 | "sg_write: count=%d\n", (int) count)); |
| 622 | if (atomic_read(&sdp->detaching)) |
| 623 | return -ENODEV; |
| 624 | if (!((filp->f_flags & O_NONBLOCK) || |
| 625 | scsi_block_when_processing_errors(sdp->device))) |
| 626 | return -ENXIO; |
| 627 | |
| 628 | if (count < SZ_SG_HEADER) |
| 629 | return -EIO; |
| 630 | if (copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) |
| 631 | return -EFAULT; |
| 632 | blocking = !(filp->f_flags & O_NONBLOCK); |
| 633 | if (old_hdr.reply_len < 0) |
| 634 | return sg_new_write(sfp, filp, buf, count, |
| 635 | blocking, 0, 0, NULL); |
| 636 | if (count < (SZ_SG_HEADER + 6)) |
| 637 | return -EIO; /* The minimum scsi command length is 6 bytes. */ |
| 638 | |
| 639 | buf += SZ_SG_HEADER; |
| 640 | if (get_user(opcode, buf)) |
| 641 | return -EFAULT; |
| 642 | |
| 643 | if (!(srp = sg_add_request(sfp))) { |
| 644 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp, |
| 645 | "sg_write: queue full\n")); |
| 646 | return -EDOM; |
| 647 | } |
| 648 | mutex_lock(&sfp->f_mutex); |
| 649 | if (sfp->next_cmd_len > 0) { |
| 650 | cmd_size = sfp->next_cmd_len; |
| 651 | sfp->next_cmd_len = 0; /* reset so only this write() effected */ |
| 652 | } else { |
| 653 | cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ |
| 654 | if ((opcode >= 0xc0) && old_hdr.twelve_byte) |
| 655 | cmd_size = 12; |
| 656 | } |
| 657 | mutex_unlock(&sfp->f_mutex); |
| 658 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, |
| 659 | "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); |
| 660 | /* Determine buffer size. */ |
| 661 | input_size = count - cmd_size; |
| 662 | mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; |
| 663 | mxsize -= SZ_SG_HEADER; |
| 664 | input_size -= SZ_SG_HEADER; |
| 665 | if (input_size < 0) { |
| 666 | sg_remove_request(sfp, srp); |
| 667 | return -EIO; /* User did not pass enough bytes for this command. */ |
| 668 | } |
| 669 | hp = &srp->header; |
| 670 | hp->interface_id = '\0'; /* indicator of old interface tunnelled */ |
| 671 | hp->cmd_len = (unsigned char) cmd_size; |
| 672 | hp->iovec_count = 0; |
| 673 | hp->mx_sb_len = 0; |
| 674 | if (input_size > 0) |
| 675 | hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? |
| 676 | SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; |
| 677 | else |
| 678 | hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; |
| 679 | hp->dxfer_len = mxsize; |
| 680 | if ((hp->dxfer_direction == SG_DXFER_TO_DEV) || |
| 681 | (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)) |
| 682 | hp->dxferp = (char __user *)buf + cmd_size; |
| 683 | else |
| 684 | hp->dxferp = NULL; |
| 685 | hp->sbp = NULL; |
| 686 | hp->timeout = old_hdr.reply_len; /* structure abuse ... */ |
| 687 | hp->flags = input_size; /* structure abuse ... */ |
| 688 | hp->pack_id = old_hdr.pack_id; |
| 689 | hp->usr_ptr = NULL; |
| 690 | if (copy_from_user(cmnd, buf, cmd_size)) { |
| 691 | sg_remove_request(sfp, srp); |
| 692 | return -EFAULT; |
| 693 | } |
| 694 | /* |
| 695 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, |
| 696 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there |
| 697 | * is a non-zero input_size, so emit a warning. |
| 698 | */ |
| 699 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { |
| 700 | printk_ratelimited(KERN_WARNING |
| 701 | "sg_write: data in/out %d/%d bytes " |
| 702 | "for SCSI command 0x%x-- guessing " |
| 703 | "data in;\n program %s not setting " |
| 704 | "count and/or reply_len properly\n", |
| 705 | old_hdr.reply_len - (int)SZ_SG_HEADER, |
| 706 | input_size, (unsigned int) cmnd[0], |
| 707 | current->comm); |
| 708 | } |
| 709 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); |
| 710 | return (k < 0) ? k : count; |
| 711 | } |
| 712 | |
| 713 | static ssize_t |
| 714 | sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, |
| 715 | size_t count, int blocking, int read_only, int sg_io_owned, |
| 716 | Sg_request **o_srp) |
| 717 | { |
| 718 | int k; |
| 719 | Sg_request *srp; |
| 720 | sg_io_hdr_t *hp; |
| 721 | unsigned char cmnd[SG_MAX_CDB_SIZE]; |
| 722 | int timeout; |
| 723 | unsigned long ul_timeout; |
| 724 | |
| 725 | if (count < SZ_SG_IO_HDR) |
| 726 | return -EINVAL; |
| 727 | |
| 728 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ |
| 729 | if (!(srp = sg_add_request(sfp))) { |
| 730 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
| 731 | "sg_new_write: queue full\n")); |
| 732 | return -EDOM; |
| 733 | } |
| 734 | srp->sg_io_owned = sg_io_owned; |
| 735 | hp = &srp->header; |
| 736 | if (get_sg_io_hdr(hp, buf)) { |
| 737 | sg_remove_request(sfp, srp); |
| 738 | return -EFAULT; |
| 739 | } |
| 740 | if (hp->interface_id != 'S') { |
| 741 | sg_remove_request(sfp, srp); |
| 742 | return -ENOSYS; |
| 743 | } |
| 744 | if (hp->flags & SG_FLAG_MMAP_IO) { |
| 745 | if (hp->dxfer_len > sfp->reserve.bufflen) { |
| 746 | sg_remove_request(sfp, srp); |
| 747 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ |
| 748 | } |
| 749 | if (hp->flags & SG_FLAG_DIRECT_IO) { |
| 750 | sg_remove_request(sfp, srp); |
| 751 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ |
| 752 | } |
| 753 | if (sfp->res_in_use) { |
| 754 | sg_remove_request(sfp, srp); |
| 755 | return -EBUSY; /* reserve buffer already being used */ |
| 756 | } |
| 757 | } |
| 758 | ul_timeout = msecs_to_jiffies(srp->header.timeout); |
| 759 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; |
| 760 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { |
| 761 | sg_remove_request(sfp, srp); |
| 762 | return -EMSGSIZE; |
| 763 | } |
| 764 | if (copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { |
| 765 | sg_remove_request(sfp, srp); |
| 766 | return -EFAULT; |
| 767 | } |
| 768 | if (read_only && sg_allow_access(file, cmnd)) { |
| 769 | sg_remove_request(sfp, srp); |
| 770 | return -EPERM; |
| 771 | } |
| 772 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); |
| 773 | if (k < 0) |
| 774 | return k; |
| 775 | if (o_srp) |
| 776 | *o_srp = srp; |
| 777 | return count; |
| 778 | } |
| 779 | |
| 780 | static int |
| 781 | sg_common_write(Sg_fd * sfp, Sg_request * srp, |
| 782 | unsigned char *cmnd, int timeout, int blocking) |
| 783 | { |
| 784 | int k, at_head; |
| 785 | Sg_device *sdp = sfp->parentdp; |
| 786 | sg_io_hdr_t *hp = &srp->header; |
| 787 | |
| 788 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ |
| 789 | hp->status = 0; |
| 790 | hp->masked_status = 0; |
| 791 | hp->msg_status = 0; |
| 792 | hp->info = 0; |
| 793 | hp->host_status = 0; |
| 794 | hp->driver_status = 0; |
| 795 | hp->resid = 0; |
| 796 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 797 | "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", |
| 798 | (int) cmnd[0], (int) hp->cmd_len)); |
| 799 | |
| 800 | if (hp->dxfer_len >= SZ_256M) { |
| 801 | sg_remove_request(sfp, srp); |
| 802 | return -EINVAL; |
| 803 | } |
| 804 | |
| 805 | k = sg_start_req(srp, cmnd); |
| 806 | if (k) { |
| 807 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
| 808 | "sg_common_write: start_req err=%d\n", k)); |
| 809 | sg_finish_rem_req(srp); |
| 810 | sg_remove_request(sfp, srp); |
| 811 | return k; /* probably out of space --> ENOMEM */ |
| 812 | } |
| 813 | if (atomic_read(&sdp->detaching)) { |
| 814 | if (srp->bio) { |
| 815 | scsi_req_free_cmd(scsi_req(srp->rq)); |
| 816 | blk_put_request(srp->rq); |
| 817 | srp->rq = NULL; |
| 818 | } |
| 819 | |
| 820 | sg_finish_rem_req(srp); |
| 821 | sg_remove_request(sfp, srp); |
| 822 | return -ENODEV; |
| 823 | } |
| 824 | |
| 825 | hp->duration = jiffies_to_msecs(jiffies); |
| 826 | if (hp->interface_id != '\0' && /* v3 (or later) interface */ |
| 827 | (SG_FLAG_Q_AT_TAIL & hp->flags)) |
| 828 | at_head = 0; |
| 829 | else |
| 830 | at_head = 1; |
| 831 | |
| 832 | srp->rq->timeout = timeout; |
| 833 | kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ |
| 834 | blk_execute_rq_nowait(NULL, srp->rq, at_head, sg_rq_end_io); |
| 835 | return 0; |
| 836 | } |
| 837 | |
| 838 | static int srp_done(Sg_fd *sfp, Sg_request *srp) |
| 839 | { |
| 840 | unsigned long flags; |
| 841 | int ret; |
| 842 | |
| 843 | read_lock_irqsave(&sfp->rq_list_lock, flags); |
| 844 | ret = srp->done; |
| 845 | read_unlock_irqrestore(&sfp->rq_list_lock, flags); |
| 846 | return ret; |
| 847 | } |
| 848 | |
| 849 | static int max_sectors_bytes(struct request_queue *q) |
| 850 | { |
| 851 | unsigned int max_sectors = queue_max_sectors(q); |
| 852 | |
| 853 | max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); |
| 854 | |
| 855 | return max_sectors << 9; |
| 856 | } |
| 857 | |
| 858 | static void |
| 859 | sg_fill_request_table(Sg_fd *sfp, sg_req_info_t *rinfo) |
| 860 | { |
| 861 | Sg_request *srp; |
| 862 | int val; |
| 863 | unsigned int ms; |
| 864 | |
| 865 | val = 0; |
| 866 | list_for_each_entry(srp, &sfp->rq_list, entry) { |
| 867 | if (val >= SG_MAX_QUEUE) |
| 868 | break; |
| 869 | rinfo[val].req_state = srp->done + 1; |
| 870 | rinfo[val].problem = |
| 871 | srp->header.masked_status & |
| 872 | srp->header.host_status & |
| 873 | srp->header.driver_status; |
| 874 | if (srp->done) |
| 875 | rinfo[val].duration = |
| 876 | srp->header.duration; |
| 877 | else { |
| 878 | ms = jiffies_to_msecs(jiffies); |
| 879 | rinfo[val].duration = |
| 880 | (ms > srp->header.duration) ? |
| 881 | (ms - srp->header.duration) : 0; |
| 882 | } |
| 883 | rinfo[val].orphan = srp->orphan; |
| 884 | rinfo[val].sg_io_owned = srp->sg_io_owned; |
| 885 | rinfo[val].pack_id = srp->header.pack_id; |
| 886 | rinfo[val].usr_ptr = srp->header.usr_ptr; |
| 887 | val++; |
| 888 | } |
| 889 | } |
| 890 | |
| 891 | #ifdef CONFIG_COMPAT |
| 892 | struct compat_sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */ |
| 893 | char req_state; |
| 894 | char orphan; |
| 895 | char sg_io_owned; |
| 896 | char problem; |
| 897 | int pack_id; |
| 898 | compat_uptr_t usr_ptr; |
| 899 | unsigned int duration; |
| 900 | int unused; |
| 901 | }; |
| 902 | |
| 903 | static int put_compat_request_table(struct compat_sg_req_info __user *o, |
| 904 | struct sg_req_info *rinfo) |
| 905 | { |
| 906 | int i; |
| 907 | for (i = 0; i < SG_MAX_QUEUE; i++) { |
| 908 | if (copy_to_user(o + i, rinfo + i, offsetof(sg_req_info_t, usr_ptr)) || |
| 909 | put_user((uintptr_t)rinfo[i].usr_ptr, &o[i].usr_ptr) || |
| 910 | put_user(rinfo[i].duration, &o[i].duration) || |
| 911 | put_user(rinfo[i].unused, &o[i].unused)) |
| 912 | return -EFAULT; |
| 913 | } |
| 914 | return 0; |
| 915 | } |
| 916 | #endif |
| 917 | |
| 918 | static long |
| 919 | sg_ioctl_common(struct file *filp, Sg_device *sdp, Sg_fd *sfp, |
| 920 | unsigned int cmd_in, void __user *p) |
| 921 | { |
| 922 | int __user *ip = p; |
| 923 | int result, val, read_only; |
| 924 | Sg_request *srp; |
| 925 | unsigned long iflags; |
| 926 | |
| 927 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 928 | "sg_ioctl: cmd=0x%x\n", (int) cmd_in)); |
| 929 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); |
| 930 | |
| 931 | switch (cmd_in) { |
| 932 | case SG_IO: |
| 933 | if (atomic_read(&sdp->detaching)) |
| 934 | return -ENODEV; |
| 935 | if (!scsi_block_when_processing_errors(sdp->device)) |
| 936 | return -ENXIO; |
| 937 | result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, |
| 938 | 1, read_only, 1, &srp); |
| 939 | if (result < 0) |
| 940 | return result; |
| 941 | result = wait_event_interruptible(sfp->read_wait, |
| 942 | (srp_done(sfp, srp) || atomic_read(&sdp->detaching))); |
| 943 | if (atomic_read(&sdp->detaching)) |
| 944 | return -ENODEV; |
| 945 | write_lock_irq(&sfp->rq_list_lock); |
| 946 | if (srp->done) { |
| 947 | srp->done = 2; |
| 948 | write_unlock_irq(&sfp->rq_list_lock); |
| 949 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); |
| 950 | return (result < 0) ? result : 0; |
| 951 | } |
| 952 | srp->orphan = 1; |
| 953 | write_unlock_irq(&sfp->rq_list_lock); |
| 954 | return result; /* -ERESTARTSYS because signal hit process */ |
| 955 | case SG_SET_TIMEOUT: |
| 956 | result = get_user(val, ip); |
| 957 | if (result) |
| 958 | return result; |
| 959 | if (val < 0) |
| 960 | return -EIO; |
| 961 | if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ)) |
| 962 | val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ), |
| 963 | INT_MAX); |
| 964 | sfp->timeout_user = val; |
| 965 | sfp->timeout = mult_frac(val, HZ, USER_HZ); |
| 966 | |
| 967 | return 0; |
| 968 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ |
| 969 | /* strange ..., for backward compatibility */ |
| 970 | return sfp->timeout_user; |
| 971 | case SG_SET_FORCE_LOW_DMA: |
| 972 | /* |
| 973 | * N.B. This ioctl never worked properly, but failed to |
| 974 | * return an error value. So returning '0' to keep compability |
| 975 | * with legacy applications. |
| 976 | */ |
| 977 | return 0; |
| 978 | case SG_GET_LOW_DMA: |
| 979 | return put_user(0, ip); |
| 980 | case SG_GET_SCSI_ID: |
| 981 | { |
| 982 | sg_scsi_id_t v; |
| 983 | |
| 984 | if (atomic_read(&sdp->detaching)) |
| 985 | return -ENODEV; |
| 986 | memset(&v, 0, sizeof(v)); |
| 987 | v.host_no = sdp->device->host->host_no; |
| 988 | v.channel = sdp->device->channel; |
| 989 | v.scsi_id = sdp->device->id; |
| 990 | v.lun = sdp->device->lun; |
| 991 | v.scsi_type = sdp->device->type; |
| 992 | v.h_cmd_per_lun = sdp->device->host->cmd_per_lun; |
| 993 | v.d_queue_depth = sdp->device->queue_depth; |
| 994 | if (copy_to_user(p, &v, sizeof(sg_scsi_id_t))) |
| 995 | return -EFAULT; |
| 996 | return 0; |
| 997 | } |
| 998 | case SG_SET_FORCE_PACK_ID: |
| 999 | result = get_user(val, ip); |
| 1000 | if (result) |
| 1001 | return result; |
| 1002 | sfp->force_packid = val ? 1 : 0; |
| 1003 | return 0; |
| 1004 | case SG_GET_PACK_ID: |
| 1005 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 1006 | list_for_each_entry(srp, &sfp->rq_list, entry) { |
| 1007 | if ((1 == srp->done) && (!srp->sg_io_owned)) { |
| 1008 | read_unlock_irqrestore(&sfp->rq_list_lock, |
| 1009 | iflags); |
| 1010 | return put_user(srp->header.pack_id, ip); |
| 1011 | } |
| 1012 | } |
| 1013 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 1014 | return put_user(-1, ip); |
| 1015 | case SG_GET_NUM_WAITING: |
| 1016 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 1017 | val = 0; |
| 1018 | list_for_each_entry(srp, &sfp->rq_list, entry) { |
| 1019 | if ((1 == srp->done) && (!srp->sg_io_owned)) |
| 1020 | ++val; |
| 1021 | } |
| 1022 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 1023 | return put_user(val, ip); |
| 1024 | case SG_GET_SG_TABLESIZE: |
| 1025 | return put_user(sdp->sg_tablesize, ip); |
| 1026 | case SG_SET_RESERVED_SIZE: |
| 1027 | result = get_user(val, ip); |
| 1028 | if (result) |
| 1029 | return result; |
| 1030 | if (val < 0) |
| 1031 | return -EINVAL; |
| 1032 | val = min_t(int, val, |
| 1033 | max_sectors_bytes(sdp->device->request_queue)); |
| 1034 | mutex_lock(&sfp->f_mutex); |
| 1035 | if (val != sfp->reserve.bufflen) { |
| 1036 | if (sfp->mmap_called || |
| 1037 | sfp->res_in_use) { |
| 1038 | mutex_unlock(&sfp->f_mutex); |
| 1039 | return -EBUSY; |
| 1040 | } |
| 1041 | |
| 1042 | sg_remove_scat(sfp, &sfp->reserve); |
| 1043 | sg_build_reserve(sfp, val); |
| 1044 | } |
| 1045 | mutex_unlock(&sfp->f_mutex); |
| 1046 | return 0; |
| 1047 | case SG_GET_RESERVED_SIZE: |
| 1048 | val = min_t(int, sfp->reserve.bufflen, |
| 1049 | max_sectors_bytes(sdp->device->request_queue)); |
| 1050 | return put_user(val, ip); |
| 1051 | case SG_SET_COMMAND_Q: |
| 1052 | result = get_user(val, ip); |
| 1053 | if (result) |
| 1054 | return result; |
| 1055 | sfp->cmd_q = val ? 1 : 0; |
| 1056 | return 0; |
| 1057 | case SG_GET_COMMAND_Q: |
| 1058 | return put_user((int) sfp->cmd_q, ip); |
| 1059 | case SG_SET_KEEP_ORPHAN: |
| 1060 | result = get_user(val, ip); |
| 1061 | if (result) |
| 1062 | return result; |
| 1063 | sfp->keep_orphan = val; |
| 1064 | return 0; |
| 1065 | case SG_GET_KEEP_ORPHAN: |
| 1066 | return put_user((int) sfp->keep_orphan, ip); |
| 1067 | case SG_NEXT_CMD_LEN: |
| 1068 | result = get_user(val, ip); |
| 1069 | if (result) |
| 1070 | return result; |
| 1071 | if (val > SG_MAX_CDB_SIZE) |
| 1072 | return -ENOMEM; |
| 1073 | sfp->next_cmd_len = (val > 0) ? val : 0; |
| 1074 | return 0; |
| 1075 | case SG_GET_VERSION_NUM: |
| 1076 | return put_user(sg_version_num, ip); |
| 1077 | case SG_GET_ACCESS_COUNT: |
| 1078 | /* faked - we don't have a real access count anymore */ |
| 1079 | val = (sdp->device ? 1 : 0); |
| 1080 | return put_user(val, ip); |
| 1081 | case SG_GET_REQUEST_TABLE: |
| 1082 | { |
| 1083 | sg_req_info_t *rinfo; |
| 1084 | |
| 1085 | rinfo = kcalloc(SG_MAX_QUEUE, SZ_SG_REQ_INFO, |
| 1086 | GFP_KERNEL); |
| 1087 | if (!rinfo) |
| 1088 | return -ENOMEM; |
| 1089 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 1090 | sg_fill_request_table(sfp, rinfo); |
| 1091 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 1092 | #ifdef CONFIG_COMPAT |
| 1093 | if (in_compat_syscall()) |
| 1094 | result = put_compat_request_table(p, rinfo); |
| 1095 | else |
| 1096 | #endif |
| 1097 | result = copy_to_user(p, rinfo, |
| 1098 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); |
| 1099 | result = result ? -EFAULT : 0; |
| 1100 | kfree(rinfo); |
| 1101 | return result; |
| 1102 | } |
| 1103 | case SG_EMULATED_HOST: |
| 1104 | if (atomic_read(&sdp->detaching)) |
| 1105 | return -ENODEV; |
| 1106 | return put_user(sdp->device->host->hostt->emulated, ip); |
| 1107 | case SCSI_IOCTL_SEND_COMMAND: |
| 1108 | if (atomic_read(&sdp->detaching)) |
| 1109 | return -ENODEV; |
| 1110 | return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); |
| 1111 | case SG_SET_DEBUG: |
| 1112 | result = get_user(val, ip); |
| 1113 | if (result) |
| 1114 | return result; |
| 1115 | sdp->sgdebug = (char) val; |
| 1116 | return 0; |
| 1117 | case BLKSECTGET: |
| 1118 | return put_user(max_sectors_bytes(sdp->device->request_queue), |
| 1119 | ip); |
| 1120 | case BLKTRACESETUP: |
| 1121 | return blk_trace_setup(sdp->device->request_queue, NULL, |
| 1122 | MKDEV(SCSI_GENERIC_MAJOR, sdp->index), |
| 1123 | NULL, p); |
| 1124 | case BLKTRACESTART: |
| 1125 | return blk_trace_startstop(sdp->device->request_queue, 1); |
| 1126 | case BLKTRACESTOP: |
| 1127 | return blk_trace_startstop(sdp->device->request_queue, 0); |
| 1128 | case BLKTRACETEARDOWN: |
| 1129 | return blk_trace_remove(sdp->device->request_queue); |
| 1130 | case SCSI_IOCTL_GET_IDLUN: |
| 1131 | case SCSI_IOCTL_GET_BUS_NUMBER: |
| 1132 | case SCSI_IOCTL_PROBE_HOST: |
| 1133 | case SG_GET_TRANSFORM: |
| 1134 | case SG_SCSI_RESET: |
| 1135 | if (atomic_read(&sdp->detaching)) |
| 1136 | return -ENODEV; |
| 1137 | break; |
| 1138 | default: |
| 1139 | if (read_only) |
| 1140 | return -EPERM; /* don't know so take safe approach */ |
| 1141 | break; |
| 1142 | } |
| 1143 | |
| 1144 | result = scsi_ioctl_block_when_processing_errors(sdp->device, |
| 1145 | cmd_in, filp->f_flags & O_NDELAY); |
| 1146 | if (result) |
| 1147 | return result; |
| 1148 | |
| 1149 | return -ENOIOCTLCMD; |
| 1150 | } |
| 1151 | |
| 1152 | static long |
| 1153 | sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) |
| 1154 | { |
| 1155 | void __user *p = (void __user *)arg; |
| 1156 | Sg_device *sdp; |
| 1157 | Sg_fd *sfp; |
| 1158 | int ret; |
| 1159 | |
| 1160 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| 1161 | return -ENXIO; |
| 1162 | |
| 1163 | ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p); |
| 1164 | if (ret != -ENOIOCTLCMD) |
| 1165 | return ret; |
| 1166 | |
| 1167 | return scsi_ioctl(sdp->device, cmd_in, p); |
| 1168 | } |
| 1169 | |
| 1170 | #ifdef CONFIG_COMPAT |
| 1171 | static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) |
| 1172 | { |
| 1173 | void __user *p = compat_ptr(arg); |
| 1174 | Sg_device *sdp; |
| 1175 | Sg_fd *sfp; |
| 1176 | int ret; |
| 1177 | |
| 1178 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| 1179 | return -ENXIO; |
| 1180 | |
| 1181 | ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p); |
| 1182 | if (ret != -ENOIOCTLCMD) |
| 1183 | return ret; |
| 1184 | |
| 1185 | return scsi_compat_ioctl(sdp->device, cmd_in, p); |
| 1186 | } |
| 1187 | #endif |
| 1188 | |
| 1189 | static __poll_t |
| 1190 | sg_poll(struct file *filp, poll_table * wait) |
| 1191 | { |
| 1192 | __poll_t res = 0; |
| 1193 | Sg_device *sdp; |
| 1194 | Sg_fd *sfp; |
| 1195 | Sg_request *srp; |
| 1196 | int count = 0; |
| 1197 | unsigned long iflags; |
| 1198 | |
| 1199 | sfp = filp->private_data; |
| 1200 | if (!sfp) |
| 1201 | return EPOLLERR; |
| 1202 | sdp = sfp->parentdp; |
| 1203 | if (!sdp) |
| 1204 | return EPOLLERR; |
| 1205 | poll_wait(filp, &sfp->read_wait, wait); |
| 1206 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 1207 | list_for_each_entry(srp, &sfp->rq_list, entry) { |
| 1208 | /* if any read waiting, flag it */ |
| 1209 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) |
| 1210 | res = EPOLLIN | EPOLLRDNORM; |
| 1211 | ++count; |
| 1212 | } |
| 1213 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 1214 | |
| 1215 | if (atomic_read(&sdp->detaching)) |
| 1216 | res |= EPOLLHUP; |
| 1217 | else if (!sfp->cmd_q) { |
| 1218 | if (0 == count) |
| 1219 | res |= EPOLLOUT | EPOLLWRNORM; |
| 1220 | } else if (count < SG_MAX_QUEUE) |
| 1221 | res |= EPOLLOUT | EPOLLWRNORM; |
| 1222 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 1223 | "sg_poll: res=0x%x\n", (__force u32) res)); |
| 1224 | return res; |
| 1225 | } |
| 1226 | |
| 1227 | static int |
| 1228 | sg_fasync(int fd, struct file *filp, int mode) |
| 1229 | { |
| 1230 | Sg_device *sdp; |
| 1231 | Sg_fd *sfp; |
| 1232 | |
| 1233 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| 1234 | return -ENXIO; |
| 1235 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 1236 | "sg_fasync: mode=%d\n", mode)); |
| 1237 | |
| 1238 | return fasync_helper(fd, filp, mode, &sfp->async_qp); |
| 1239 | } |
| 1240 | |
| 1241 | static vm_fault_t |
| 1242 | sg_vma_fault(struct vm_fault *vmf) |
| 1243 | { |
| 1244 | struct vm_area_struct *vma = vmf->vma; |
| 1245 | Sg_fd *sfp; |
| 1246 | unsigned long offset, len, sa; |
| 1247 | Sg_scatter_hold *rsv_schp; |
| 1248 | int k, length; |
| 1249 | |
| 1250 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) |
| 1251 | return VM_FAULT_SIGBUS; |
| 1252 | rsv_schp = &sfp->reserve; |
| 1253 | offset = vmf->pgoff << PAGE_SHIFT; |
| 1254 | if (offset >= rsv_schp->bufflen) |
| 1255 | return VM_FAULT_SIGBUS; |
| 1256 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, |
| 1257 | "sg_vma_fault: offset=%lu, scatg=%d\n", |
| 1258 | offset, rsv_schp->k_use_sg)); |
| 1259 | sa = vma->vm_start; |
| 1260 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
| 1261 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { |
| 1262 | len = vma->vm_end - sa; |
| 1263 | len = (len < length) ? len : length; |
| 1264 | if (offset < len) { |
| 1265 | struct page *page = nth_page(rsv_schp->pages[k], |
| 1266 | offset >> PAGE_SHIFT); |
| 1267 | get_page(page); /* increment page count */ |
| 1268 | vmf->page = page; |
| 1269 | return 0; /* success */ |
| 1270 | } |
| 1271 | sa += len; |
| 1272 | offset -= len; |
| 1273 | } |
| 1274 | |
| 1275 | return VM_FAULT_SIGBUS; |
| 1276 | } |
| 1277 | |
| 1278 | static const struct vm_operations_struct sg_mmap_vm_ops = { |
| 1279 | .fault = sg_vma_fault, |
| 1280 | }; |
| 1281 | |
| 1282 | static int |
| 1283 | sg_mmap(struct file *filp, struct vm_area_struct *vma) |
| 1284 | { |
| 1285 | Sg_fd *sfp; |
| 1286 | unsigned long req_sz, len, sa; |
| 1287 | Sg_scatter_hold *rsv_schp; |
| 1288 | int k, length; |
| 1289 | int ret = 0; |
| 1290 | |
| 1291 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) |
| 1292 | return -ENXIO; |
| 1293 | req_sz = vma->vm_end - vma->vm_start; |
| 1294 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, |
| 1295 | "sg_mmap starting, vm_start=%p, len=%d\n", |
| 1296 | (void *) vma->vm_start, (int) req_sz)); |
| 1297 | if (vma->vm_pgoff) |
| 1298 | return -EINVAL; /* want no offset */ |
| 1299 | rsv_schp = &sfp->reserve; |
| 1300 | mutex_lock(&sfp->f_mutex); |
| 1301 | if (req_sz > rsv_schp->bufflen) { |
| 1302 | ret = -ENOMEM; /* cannot map more than reserved buffer */ |
| 1303 | goto out; |
| 1304 | } |
| 1305 | |
| 1306 | sa = vma->vm_start; |
| 1307 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
| 1308 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { |
| 1309 | len = vma->vm_end - sa; |
| 1310 | len = (len < length) ? len : length; |
| 1311 | sa += len; |
| 1312 | } |
| 1313 | |
| 1314 | sfp->mmap_called = 1; |
| 1315 | vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; |
| 1316 | vma->vm_private_data = sfp; |
| 1317 | vma->vm_ops = &sg_mmap_vm_ops; |
| 1318 | out: |
| 1319 | mutex_unlock(&sfp->f_mutex); |
| 1320 | return ret; |
| 1321 | } |
| 1322 | |
| 1323 | static void |
| 1324 | sg_rq_end_io_usercontext(struct work_struct *work) |
| 1325 | { |
| 1326 | struct sg_request *srp = container_of(work, struct sg_request, ew.work); |
| 1327 | struct sg_fd *sfp = srp->parentfp; |
| 1328 | |
| 1329 | sg_finish_rem_req(srp); |
| 1330 | sg_remove_request(sfp, srp); |
| 1331 | kref_put(&sfp->f_ref, sg_remove_sfp); |
| 1332 | } |
| 1333 | |
| 1334 | /* |
| 1335 | * This function is a "bottom half" handler that is called by the mid |
| 1336 | * level when a command is completed (or has failed). |
| 1337 | */ |
| 1338 | static void |
| 1339 | sg_rq_end_io(struct request *rq, blk_status_t status) |
| 1340 | { |
| 1341 | struct sg_request *srp = rq->end_io_data; |
| 1342 | struct scsi_request *req = scsi_req(rq); |
| 1343 | Sg_device *sdp; |
| 1344 | Sg_fd *sfp; |
| 1345 | unsigned long iflags; |
| 1346 | unsigned int ms; |
| 1347 | char *sense; |
| 1348 | int result, resid, done = 1; |
| 1349 | |
| 1350 | if (WARN_ON(srp->done != 0)) |
| 1351 | return; |
| 1352 | |
| 1353 | sfp = srp->parentfp; |
| 1354 | if (WARN_ON(sfp == NULL)) |
| 1355 | return; |
| 1356 | |
| 1357 | sdp = sfp->parentdp; |
| 1358 | if (unlikely(atomic_read(&sdp->detaching))) |
| 1359 | pr_info("%s: device detaching\n", __func__); |
| 1360 | |
| 1361 | sense = req->sense; |
| 1362 | result = req->result; |
| 1363 | resid = req->resid_len; |
| 1364 | |
| 1365 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, |
| 1366 | "sg_cmd_done: pack_id=%d, res=0x%x\n", |
| 1367 | srp->header.pack_id, result)); |
| 1368 | srp->header.resid = resid; |
| 1369 | ms = jiffies_to_msecs(jiffies); |
| 1370 | srp->header.duration = (ms > srp->header.duration) ? |
| 1371 | (ms - srp->header.duration) : 0; |
| 1372 | if (0 != result) { |
| 1373 | struct scsi_sense_hdr sshdr; |
| 1374 | |
| 1375 | srp->header.status = 0xff & result; |
| 1376 | srp->header.masked_status = status_byte(result); |
| 1377 | srp->header.msg_status = COMMAND_COMPLETE; |
| 1378 | srp->header.host_status = host_byte(result); |
| 1379 | srp->header.driver_status = driver_byte(result); |
| 1380 | if ((sdp->sgdebug > 0) && |
| 1381 | ((CHECK_CONDITION == srp->header.masked_status) || |
| 1382 | (COMMAND_TERMINATED == srp->header.masked_status))) |
| 1383 | __scsi_print_sense(sdp->device, __func__, sense, |
| 1384 | SCSI_SENSE_BUFFERSIZE); |
| 1385 | |
| 1386 | /* Following if statement is a patch supplied by Eric Youngdale */ |
| 1387 | if (driver_byte(result) != 0 |
| 1388 | && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) |
| 1389 | && !scsi_sense_is_deferred(&sshdr) |
| 1390 | && sshdr.sense_key == UNIT_ATTENTION |
| 1391 | && sdp->device->removable) { |
| 1392 | /* Detected possible disc change. Set the bit - this */ |
| 1393 | /* may be used if there are filesystems using this device */ |
| 1394 | sdp->device->changed = 1; |
| 1395 | } |
| 1396 | } |
| 1397 | |
| 1398 | if (req->sense_len) |
| 1399 | memcpy(srp->sense_b, req->sense, SCSI_SENSE_BUFFERSIZE); |
| 1400 | |
| 1401 | /* Rely on write phase to clean out srp status values, so no "else" */ |
| 1402 | |
| 1403 | /* |
| 1404 | * Free the request as soon as it is complete so that its resources |
| 1405 | * can be reused without waiting for userspace to read() the |
| 1406 | * result. But keep the associated bio (if any) around until |
| 1407 | * blk_rq_unmap_user() can be called from user context. |
| 1408 | */ |
| 1409 | srp->rq = NULL; |
| 1410 | scsi_req_free_cmd(scsi_req(rq)); |
| 1411 | blk_put_request(rq); |
| 1412 | |
| 1413 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 1414 | if (unlikely(srp->orphan)) { |
| 1415 | if (sfp->keep_orphan) |
| 1416 | srp->sg_io_owned = 0; |
| 1417 | else |
| 1418 | done = 0; |
| 1419 | } |
| 1420 | srp->done = done; |
| 1421 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 1422 | |
| 1423 | if (likely(done)) { |
| 1424 | /* Now wake up any sg_read() that is waiting for this |
| 1425 | * packet. |
| 1426 | */ |
| 1427 | wake_up_interruptible(&sfp->read_wait); |
| 1428 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); |
| 1429 | kref_put(&sfp->f_ref, sg_remove_sfp); |
| 1430 | } else { |
| 1431 | INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); |
| 1432 | schedule_work(&srp->ew.work); |
| 1433 | } |
| 1434 | } |
| 1435 | |
| 1436 | static const struct file_operations sg_fops = { |
| 1437 | .owner = THIS_MODULE, |
| 1438 | .read = sg_read, |
| 1439 | .write = sg_write, |
| 1440 | .poll = sg_poll, |
| 1441 | .unlocked_ioctl = sg_ioctl, |
| 1442 | #ifdef CONFIG_COMPAT |
| 1443 | .compat_ioctl = sg_compat_ioctl, |
| 1444 | #endif |
| 1445 | .open = sg_open, |
| 1446 | .mmap = sg_mmap, |
| 1447 | .release = sg_release, |
| 1448 | .fasync = sg_fasync, |
| 1449 | .llseek = no_llseek, |
| 1450 | }; |
| 1451 | |
| 1452 | static struct class *sg_sysfs_class; |
| 1453 | |
| 1454 | static int sg_sysfs_valid = 0; |
| 1455 | |
| 1456 | static Sg_device * |
| 1457 | sg_alloc(struct scsi_device *scsidp) |
| 1458 | { |
| 1459 | struct request_queue *q = scsidp->request_queue; |
| 1460 | Sg_device *sdp; |
| 1461 | unsigned long iflags; |
| 1462 | int error; |
| 1463 | u32 k; |
| 1464 | |
| 1465 | sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); |
| 1466 | if (!sdp) { |
| 1467 | sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device " |
| 1468 | "failure\n", __func__); |
| 1469 | return ERR_PTR(-ENOMEM); |
| 1470 | } |
| 1471 | |
| 1472 | idr_preload(GFP_KERNEL); |
| 1473 | write_lock_irqsave(&sg_index_lock, iflags); |
| 1474 | |
| 1475 | error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT); |
| 1476 | if (error < 0) { |
| 1477 | if (error == -ENOSPC) { |
| 1478 | sdev_printk(KERN_WARNING, scsidp, |
| 1479 | "Unable to attach sg device type=%d, minor number exceeds %d\n", |
| 1480 | scsidp->type, SG_MAX_DEVS - 1); |
| 1481 | error = -ENODEV; |
| 1482 | } else { |
| 1483 | sdev_printk(KERN_WARNING, scsidp, "%s: idr " |
| 1484 | "allocation Sg_device failure: %d\n", |
| 1485 | __func__, error); |
| 1486 | } |
| 1487 | goto out_unlock; |
| 1488 | } |
| 1489 | k = error; |
| 1490 | |
| 1491 | SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp, |
| 1492 | "sg_alloc: dev=%d \n", k)); |
| 1493 | sprintf(sdp->name, "sg%d", k); |
| 1494 | sdp->device = scsidp; |
| 1495 | mutex_init(&sdp->open_rel_lock); |
| 1496 | INIT_LIST_HEAD(&sdp->sfds); |
| 1497 | init_waitqueue_head(&sdp->open_wait); |
| 1498 | atomic_set(&sdp->detaching, 0); |
| 1499 | rwlock_init(&sdp->sfd_lock); |
| 1500 | sdp->sg_tablesize = queue_max_segments(q); |
| 1501 | sdp->index = k; |
| 1502 | kref_init(&sdp->d_ref); |
| 1503 | error = 0; |
| 1504 | |
| 1505 | out_unlock: |
| 1506 | write_unlock_irqrestore(&sg_index_lock, iflags); |
| 1507 | idr_preload_end(); |
| 1508 | |
| 1509 | if (error) { |
| 1510 | kfree(sdp); |
| 1511 | return ERR_PTR(error); |
| 1512 | } |
| 1513 | return sdp; |
| 1514 | } |
| 1515 | |
| 1516 | static int |
| 1517 | sg_add_device(struct device *cl_dev, struct class_interface *cl_intf) |
| 1518 | { |
| 1519 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
| 1520 | Sg_device *sdp = NULL; |
| 1521 | struct cdev * cdev = NULL; |
| 1522 | int error; |
| 1523 | unsigned long iflags; |
| 1524 | |
| 1525 | error = -ENOMEM; |
| 1526 | cdev = cdev_alloc(); |
| 1527 | if (!cdev) { |
| 1528 | pr_warn("%s: cdev_alloc failed\n", __func__); |
| 1529 | goto out; |
| 1530 | } |
| 1531 | cdev->owner = THIS_MODULE; |
| 1532 | cdev->ops = &sg_fops; |
| 1533 | |
| 1534 | sdp = sg_alloc(scsidp); |
| 1535 | if (IS_ERR(sdp)) { |
| 1536 | pr_warn("%s: sg_alloc failed\n", __func__); |
| 1537 | error = PTR_ERR(sdp); |
| 1538 | goto out; |
| 1539 | } |
| 1540 | |
| 1541 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); |
| 1542 | if (error) |
| 1543 | goto cdev_add_err; |
| 1544 | |
| 1545 | sdp->cdev = cdev; |
| 1546 | if (sg_sysfs_valid) { |
| 1547 | struct device *sg_class_member; |
| 1548 | |
| 1549 | sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, |
| 1550 | MKDEV(SCSI_GENERIC_MAJOR, |
| 1551 | sdp->index), |
| 1552 | sdp, "%s", sdp->name); |
| 1553 | if (IS_ERR(sg_class_member)) { |
| 1554 | pr_err("%s: device_create failed\n", __func__); |
| 1555 | error = PTR_ERR(sg_class_member); |
| 1556 | goto cdev_add_err; |
| 1557 | } |
| 1558 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, |
| 1559 | &sg_class_member->kobj, "generic"); |
| 1560 | if (error) |
| 1561 | pr_err("%s: unable to make symlink 'generic' back " |
| 1562 | "to sg%d\n", __func__, sdp->index); |
| 1563 | } else |
| 1564 | pr_warn("%s: sg_sys Invalid\n", __func__); |
| 1565 | |
| 1566 | sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d " |
| 1567 | "type %d\n", sdp->index, scsidp->type); |
| 1568 | |
| 1569 | dev_set_drvdata(cl_dev, sdp); |
| 1570 | |
| 1571 | return 0; |
| 1572 | |
| 1573 | cdev_add_err: |
| 1574 | write_lock_irqsave(&sg_index_lock, iflags); |
| 1575 | idr_remove(&sg_index_idr, sdp->index); |
| 1576 | write_unlock_irqrestore(&sg_index_lock, iflags); |
| 1577 | kfree(sdp); |
| 1578 | |
| 1579 | out: |
| 1580 | if (cdev) |
| 1581 | cdev_del(cdev); |
| 1582 | return error; |
| 1583 | } |
| 1584 | |
| 1585 | static void |
| 1586 | sg_device_destroy(struct kref *kref) |
| 1587 | { |
| 1588 | struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); |
| 1589 | unsigned long flags; |
| 1590 | |
| 1591 | /* CAUTION! Note that the device can still be found via idr_find() |
| 1592 | * even though the refcount is 0. Therefore, do idr_remove() BEFORE |
| 1593 | * any other cleanup. |
| 1594 | */ |
| 1595 | |
| 1596 | write_lock_irqsave(&sg_index_lock, flags); |
| 1597 | idr_remove(&sg_index_idr, sdp->index); |
| 1598 | write_unlock_irqrestore(&sg_index_lock, flags); |
| 1599 | |
| 1600 | SCSI_LOG_TIMEOUT(3, |
| 1601 | sg_printk(KERN_INFO, sdp, "sg_device_destroy\n")); |
| 1602 | |
| 1603 | kfree(sdp); |
| 1604 | } |
| 1605 | |
| 1606 | static void |
| 1607 | sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf) |
| 1608 | { |
| 1609 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
| 1610 | Sg_device *sdp = dev_get_drvdata(cl_dev); |
| 1611 | unsigned long iflags; |
| 1612 | Sg_fd *sfp; |
| 1613 | int val; |
| 1614 | |
| 1615 | if (!sdp) |
| 1616 | return; |
| 1617 | /* want sdp->detaching non-zero as soon as possible */ |
| 1618 | val = atomic_inc_return(&sdp->detaching); |
| 1619 | if (val > 1) |
| 1620 | return; /* only want to do following once per device */ |
| 1621 | |
| 1622 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 1623 | "%s\n", __func__)); |
| 1624 | |
| 1625 | read_lock_irqsave(&sdp->sfd_lock, iflags); |
| 1626 | list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { |
| 1627 | wake_up_interruptible_all(&sfp->read_wait); |
| 1628 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); |
| 1629 | } |
| 1630 | wake_up_interruptible_all(&sdp->open_wait); |
| 1631 | read_unlock_irqrestore(&sdp->sfd_lock, iflags); |
| 1632 | |
| 1633 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); |
| 1634 | device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); |
| 1635 | cdev_del(sdp->cdev); |
| 1636 | sdp->cdev = NULL; |
| 1637 | |
| 1638 | kref_put(&sdp->d_ref, sg_device_destroy); |
| 1639 | } |
| 1640 | |
| 1641 | module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); |
| 1642 | module_param_named(def_reserved_size, def_reserved_size, int, |
| 1643 | S_IRUGO | S_IWUSR); |
| 1644 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); |
| 1645 | |
| 1646 | MODULE_AUTHOR("Douglas Gilbert"); |
| 1647 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); |
| 1648 | MODULE_LICENSE("GPL"); |
| 1649 | MODULE_VERSION(SG_VERSION_STR); |
| 1650 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |
| 1651 | |
| 1652 | MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " |
| 1653 | "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); |
| 1654 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); |
| 1655 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); |
| 1656 | |
| 1657 | static int __init |
| 1658 | init_sg(void) |
| 1659 | { |
| 1660 | int rc; |
| 1661 | |
| 1662 | if (scatter_elem_sz < PAGE_SIZE) { |
| 1663 | scatter_elem_sz = PAGE_SIZE; |
| 1664 | scatter_elem_sz_prev = scatter_elem_sz; |
| 1665 | } |
| 1666 | if (def_reserved_size >= 0) |
| 1667 | sg_big_buff = def_reserved_size; |
| 1668 | else |
| 1669 | def_reserved_size = sg_big_buff; |
| 1670 | |
| 1671 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), |
| 1672 | SG_MAX_DEVS, "sg"); |
| 1673 | if (rc) |
| 1674 | return rc; |
| 1675 | sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); |
| 1676 | if ( IS_ERR(sg_sysfs_class) ) { |
| 1677 | rc = PTR_ERR(sg_sysfs_class); |
| 1678 | goto err_out; |
| 1679 | } |
| 1680 | sg_sysfs_valid = 1; |
| 1681 | rc = scsi_register_interface(&sg_interface); |
| 1682 | if (0 == rc) { |
| 1683 | #ifdef CONFIG_SCSI_PROC_FS |
| 1684 | sg_proc_init(); |
| 1685 | #endif /* CONFIG_SCSI_PROC_FS */ |
| 1686 | return 0; |
| 1687 | } |
| 1688 | class_destroy(sg_sysfs_class); |
| 1689 | err_out: |
| 1690 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); |
| 1691 | return rc; |
| 1692 | } |
| 1693 | |
| 1694 | static void __exit |
| 1695 | exit_sg(void) |
| 1696 | { |
| 1697 | #ifdef CONFIG_SCSI_PROC_FS |
| 1698 | remove_proc_subtree("scsi/sg", NULL); |
| 1699 | #endif /* CONFIG_SCSI_PROC_FS */ |
| 1700 | scsi_unregister_interface(&sg_interface); |
| 1701 | class_destroy(sg_sysfs_class); |
| 1702 | sg_sysfs_valid = 0; |
| 1703 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), |
| 1704 | SG_MAX_DEVS); |
| 1705 | idr_destroy(&sg_index_idr); |
| 1706 | } |
| 1707 | |
| 1708 | static int |
| 1709 | sg_start_req(Sg_request *srp, unsigned char *cmd) |
| 1710 | { |
| 1711 | int res; |
| 1712 | struct request *rq; |
| 1713 | struct scsi_request *req; |
| 1714 | Sg_fd *sfp = srp->parentfp; |
| 1715 | sg_io_hdr_t *hp = &srp->header; |
| 1716 | int dxfer_len = (int) hp->dxfer_len; |
| 1717 | int dxfer_dir = hp->dxfer_direction; |
| 1718 | unsigned int iov_count = hp->iovec_count; |
| 1719 | Sg_scatter_hold *req_schp = &srp->data; |
| 1720 | Sg_scatter_hold *rsv_schp = &sfp->reserve; |
| 1721 | struct request_queue *q = sfp->parentdp->device->request_queue; |
| 1722 | struct rq_map_data *md, map_data; |
| 1723 | int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; |
| 1724 | unsigned char *long_cmdp = NULL; |
| 1725 | |
| 1726 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 1727 | "sg_start_req: dxfer_len=%d\n", |
| 1728 | dxfer_len)); |
| 1729 | |
| 1730 | if (hp->cmd_len > BLK_MAX_CDB) { |
| 1731 | long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL); |
| 1732 | if (!long_cmdp) |
| 1733 | return -ENOMEM; |
| 1734 | } |
| 1735 | |
| 1736 | /* |
| 1737 | * NOTE |
| 1738 | * |
| 1739 | * With scsi-mq enabled, there are a fixed number of preallocated |
| 1740 | * requests equal in number to shost->can_queue. If all of the |
| 1741 | * preallocated requests are already in use, then blk_get_request() |
| 1742 | * will sleep until an active command completes, freeing up a request. |
| 1743 | * Although waiting in an asynchronous interface is less than ideal, we |
| 1744 | * do not want to use BLK_MQ_REQ_NOWAIT here because userspace might |
| 1745 | * not expect an EWOULDBLOCK from this condition. |
| 1746 | */ |
| 1747 | rq = blk_get_request(q, hp->dxfer_direction == SG_DXFER_TO_DEV ? |
| 1748 | REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); |
| 1749 | if (IS_ERR(rq)) { |
| 1750 | kfree(long_cmdp); |
| 1751 | return PTR_ERR(rq); |
| 1752 | } |
| 1753 | req = scsi_req(rq); |
| 1754 | |
| 1755 | if (hp->cmd_len > BLK_MAX_CDB) |
| 1756 | req->cmd = long_cmdp; |
| 1757 | memcpy(req->cmd, cmd, hp->cmd_len); |
| 1758 | req->cmd_len = hp->cmd_len; |
| 1759 | |
| 1760 | srp->rq = rq; |
| 1761 | rq->end_io_data = srp; |
| 1762 | req->retries = SG_DEFAULT_RETRIES; |
| 1763 | |
| 1764 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) |
| 1765 | return 0; |
| 1766 | |
| 1767 | if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && |
| 1768 | dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && |
| 1769 | blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) |
| 1770 | md = NULL; |
| 1771 | else |
| 1772 | md = &map_data; |
| 1773 | |
| 1774 | if (md) { |
| 1775 | mutex_lock(&sfp->f_mutex); |
| 1776 | if (dxfer_len <= rsv_schp->bufflen && |
| 1777 | !sfp->res_in_use) { |
| 1778 | sfp->res_in_use = 1; |
| 1779 | sg_link_reserve(sfp, srp, dxfer_len); |
| 1780 | } else if (hp->flags & SG_FLAG_MMAP_IO) { |
| 1781 | res = -EBUSY; /* sfp->res_in_use == 1 */ |
| 1782 | if (dxfer_len > rsv_schp->bufflen) |
| 1783 | res = -ENOMEM; |
| 1784 | mutex_unlock(&sfp->f_mutex); |
| 1785 | return res; |
| 1786 | } else { |
| 1787 | res = sg_build_indirect(req_schp, sfp, dxfer_len); |
| 1788 | if (res) { |
| 1789 | mutex_unlock(&sfp->f_mutex); |
| 1790 | return res; |
| 1791 | } |
| 1792 | } |
| 1793 | mutex_unlock(&sfp->f_mutex); |
| 1794 | |
| 1795 | md->pages = req_schp->pages; |
| 1796 | md->page_order = req_schp->page_order; |
| 1797 | md->nr_entries = req_schp->k_use_sg; |
| 1798 | md->offset = 0; |
| 1799 | md->null_mapped = hp->dxferp ? 0 : 1; |
| 1800 | if (dxfer_dir == SG_DXFER_TO_FROM_DEV) |
| 1801 | md->from_user = 1; |
| 1802 | else |
| 1803 | md->from_user = 0; |
| 1804 | } |
| 1805 | |
| 1806 | if (iov_count) { |
| 1807 | struct iovec *iov = NULL; |
| 1808 | struct iov_iter i; |
| 1809 | |
| 1810 | res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i); |
| 1811 | if (res < 0) |
| 1812 | return res; |
| 1813 | |
| 1814 | iov_iter_truncate(&i, hp->dxfer_len); |
| 1815 | if (!iov_iter_count(&i)) { |
| 1816 | kfree(iov); |
| 1817 | return -EINVAL; |
| 1818 | } |
| 1819 | |
| 1820 | res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC); |
| 1821 | kfree(iov); |
| 1822 | } else |
| 1823 | res = blk_rq_map_user(q, rq, md, hp->dxferp, |
| 1824 | hp->dxfer_len, GFP_ATOMIC); |
| 1825 | |
| 1826 | if (!res) { |
| 1827 | srp->bio = rq->bio; |
| 1828 | |
| 1829 | if (!md) { |
| 1830 | req_schp->dio_in_use = 1; |
| 1831 | hp->info |= SG_INFO_DIRECT_IO; |
| 1832 | } |
| 1833 | } |
| 1834 | return res; |
| 1835 | } |
| 1836 | |
| 1837 | static int |
| 1838 | sg_finish_rem_req(Sg_request *srp) |
| 1839 | { |
| 1840 | int ret = 0; |
| 1841 | |
| 1842 | Sg_fd *sfp = srp->parentfp; |
| 1843 | Sg_scatter_hold *req_schp = &srp->data; |
| 1844 | |
| 1845 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 1846 | "sg_finish_rem_req: res_used=%d\n", |
| 1847 | (int) srp->res_used)); |
| 1848 | if (srp->bio) |
| 1849 | ret = blk_rq_unmap_user(srp->bio); |
| 1850 | |
| 1851 | if (srp->rq) { |
| 1852 | scsi_req_free_cmd(scsi_req(srp->rq)); |
| 1853 | blk_put_request(srp->rq); |
| 1854 | } |
| 1855 | |
| 1856 | if (srp->res_used) |
| 1857 | sg_unlink_reserve(sfp, srp); |
| 1858 | else |
| 1859 | sg_remove_scat(sfp, req_schp); |
| 1860 | |
| 1861 | return ret; |
| 1862 | } |
| 1863 | |
| 1864 | static int |
| 1865 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) |
| 1866 | { |
| 1867 | int sg_bufflen = tablesize * sizeof(struct page *); |
| 1868 | gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; |
| 1869 | |
| 1870 | schp->pages = kzalloc(sg_bufflen, gfp_flags); |
| 1871 | if (!schp->pages) |
| 1872 | return -ENOMEM; |
| 1873 | schp->sglist_len = sg_bufflen; |
| 1874 | return tablesize; /* number of scat_gath elements allocated */ |
| 1875 | } |
| 1876 | |
| 1877 | static int |
| 1878 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) |
| 1879 | { |
| 1880 | int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; |
| 1881 | int sg_tablesize = sfp->parentdp->sg_tablesize; |
| 1882 | int blk_size = buff_size, order; |
| 1883 | gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN | __GFP_ZERO; |
| 1884 | |
| 1885 | if (blk_size < 0) |
| 1886 | return -EFAULT; |
| 1887 | if (0 == blk_size) |
| 1888 | ++blk_size; /* don't know why */ |
| 1889 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ |
| 1890 | blk_size = ALIGN(blk_size, SG_SECTOR_SZ); |
| 1891 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 1892 | "sg_build_indirect: buff_size=%d, blk_size=%d\n", |
| 1893 | buff_size, blk_size)); |
| 1894 | |
| 1895 | /* N.B. ret_sz carried into this block ... */ |
| 1896 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); |
| 1897 | if (mx_sc_elems < 0) |
| 1898 | return mx_sc_elems; /* most likely -ENOMEM */ |
| 1899 | |
| 1900 | num = scatter_elem_sz; |
| 1901 | if (unlikely(num != scatter_elem_sz_prev)) { |
| 1902 | if (num < PAGE_SIZE) { |
| 1903 | scatter_elem_sz = PAGE_SIZE; |
| 1904 | scatter_elem_sz_prev = PAGE_SIZE; |
| 1905 | } else |
| 1906 | scatter_elem_sz_prev = num; |
| 1907 | } |
| 1908 | |
| 1909 | order = get_order(num); |
| 1910 | retry: |
| 1911 | ret_sz = 1 << (PAGE_SHIFT + order); |
| 1912 | |
| 1913 | for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; |
| 1914 | k++, rem_sz -= ret_sz) { |
| 1915 | |
| 1916 | num = (rem_sz > scatter_elem_sz_prev) ? |
| 1917 | scatter_elem_sz_prev : rem_sz; |
| 1918 | |
| 1919 | schp->pages[k] = alloc_pages(gfp_mask, order); |
| 1920 | if (!schp->pages[k]) |
| 1921 | goto out; |
| 1922 | |
| 1923 | if (num == scatter_elem_sz_prev) { |
| 1924 | if (unlikely(ret_sz > scatter_elem_sz_prev)) { |
| 1925 | scatter_elem_sz = ret_sz; |
| 1926 | scatter_elem_sz_prev = ret_sz; |
| 1927 | } |
| 1928 | } |
| 1929 | |
| 1930 | SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, |
| 1931 | "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n", |
| 1932 | k, num, ret_sz)); |
| 1933 | } /* end of for loop */ |
| 1934 | |
| 1935 | schp->page_order = order; |
| 1936 | schp->k_use_sg = k; |
| 1937 | SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, |
| 1938 | "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", |
| 1939 | k, rem_sz)); |
| 1940 | |
| 1941 | schp->bufflen = blk_size; |
| 1942 | if (rem_sz > 0) /* must have failed */ |
| 1943 | return -ENOMEM; |
| 1944 | return 0; |
| 1945 | out: |
| 1946 | for (i = 0; i < k; i++) |
| 1947 | __free_pages(schp->pages[i], order); |
| 1948 | |
| 1949 | if (--order >= 0) |
| 1950 | goto retry; |
| 1951 | |
| 1952 | return -ENOMEM; |
| 1953 | } |
| 1954 | |
| 1955 | static void |
| 1956 | sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp) |
| 1957 | { |
| 1958 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 1959 | "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); |
| 1960 | if (schp->pages && schp->sglist_len > 0) { |
| 1961 | if (!schp->dio_in_use) { |
| 1962 | int k; |
| 1963 | |
| 1964 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { |
| 1965 | SCSI_LOG_TIMEOUT(5, |
| 1966 | sg_printk(KERN_INFO, sfp->parentdp, |
| 1967 | "sg_remove_scat: k=%d, pg=0x%p\n", |
| 1968 | k, schp->pages[k])); |
| 1969 | __free_pages(schp->pages[k], schp->page_order); |
| 1970 | } |
| 1971 | |
| 1972 | kfree(schp->pages); |
| 1973 | } |
| 1974 | } |
| 1975 | memset(schp, 0, sizeof (*schp)); |
| 1976 | } |
| 1977 | |
| 1978 | static int |
| 1979 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) |
| 1980 | { |
| 1981 | Sg_scatter_hold *schp = &srp->data; |
| 1982 | int k, num; |
| 1983 | |
| 1984 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, |
| 1985 | "sg_read_oxfer: num_read_xfer=%d\n", |
| 1986 | num_read_xfer)); |
| 1987 | if ((!outp) || (num_read_xfer <= 0)) |
| 1988 | return 0; |
| 1989 | |
| 1990 | num = 1 << (PAGE_SHIFT + schp->page_order); |
| 1991 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { |
| 1992 | if (num > num_read_xfer) { |
| 1993 | if (copy_to_user(outp, page_address(schp->pages[k]), |
| 1994 | num_read_xfer)) |
| 1995 | return -EFAULT; |
| 1996 | break; |
| 1997 | } else { |
| 1998 | if (copy_to_user(outp, page_address(schp->pages[k]), |
| 1999 | num)) |
| 2000 | return -EFAULT; |
| 2001 | num_read_xfer -= num; |
| 2002 | if (num_read_xfer <= 0) |
| 2003 | break; |
| 2004 | outp += num; |
| 2005 | } |
| 2006 | } |
| 2007 | |
| 2008 | return 0; |
| 2009 | } |
| 2010 | |
| 2011 | static void |
| 2012 | sg_build_reserve(Sg_fd * sfp, int req_size) |
| 2013 | { |
| 2014 | Sg_scatter_hold *schp = &sfp->reserve; |
| 2015 | |
| 2016 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 2017 | "sg_build_reserve: req_size=%d\n", req_size)); |
| 2018 | do { |
| 2019 | if (req_size < PAGE_SIZE) |
| 2020 | req_size = PAGE_SIZE; |
| 2021 | if (0 == sg_build_indirect(schp, sfp, req_size)) |
| 2022 | return; |
| 2023 | else |
| 2024 | sg_remove_scat(sfp, schp); |
| 2025 | req_size >>= 1; /* divide by 2 */ |
| 2026 | } while (req_size > (PAGE_SIZE / 2)); |
| 2027 | } |
| 2028 | |
| 2029 | static void |
| 2030 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) |
| 2031 | { |
| 2032 | Sg_scatter_hold *req_schp = &srp->data; |
| 2033 | Sg_scatter_hold *rsv_schp = &sfp->reserve; |
| 2034 | int k, num, rem; |
| 2035 | |
| 2036 | srp->res_used = 1; |
| 2037 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 2038 | "sg_link_reserve: size=%d\n", size)); |
| 2039 | rem = size; |
| 2040 | |
| 2041 | num = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
| 2042 | for (k = 0; k < rsv_schp->k_use_sg; k++) { |
| 2043 | if (rem <= num) { |
| 2044 | req_schp->k_use_sg = k + 1; |
| 2045 | req_schp->sglist_len = rsv_schp->sglist_len; |
| 2046 | req_schp->pages = rsv_schp->pages; |
| 2047 | |
| 2048 | req_schp->bufflen = size; |
| 2049 | req_schp->page_order = rsv_schp->page_order; |
| 2050 | break; |
| 2051 | } else |
| 2052 | rem -= num; |
| 2053 | } |
| 2054 | |
| 2055 | if (k >= rsv_schp->k_use_sg) |
| 2056 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
| 2057 | "sg_link_reserve: BAD size\n")); |
| 2058 | } |
| 2059 | |
| 2060 | static void |
| 2061 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) |
| 2062 | { |
| 2063 | Sg_scatter_hold *req_schp = &srp->data; |
| 2064 | |
| 2065 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, |
| 2066 | "sg_unlink_reserve: req->k_use_sg=%d\n", |
| 2067 | (int) req_schp->k_use_sg)); |
| 2068 | req_schp->k_use_sg = 0; |
| 2069 | req_schp->bufflen = 0; |
| 2070 | req_schp->pages = NULL; |
| 2071 | req_schp->page_order = 0; |
| 2072 | req_schp->sglist_len = 0; |
| 2073 | srp->res_used = 0; |
| 2074 | /* Called without mutex lock to avoid deadlock */ |
| 2075 | sfp->res_in_use = 0; |
| 2076 | } |
| 2077 | |
| 2078 | static Sg_request * |
| 2079 | sg_get_rq_mark(Sg_fd * sfp, int pack_id) |
| 2080 | { |
| 2081 | Sg_request *resp; |
| 2082 | unsigned long iflags; |
| 2083 | |
| 2084 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 2085 | list_for_each_entry(resp, &sfp->rq_list, entry) { |
| 2086 | /* look for requests that are ready + not SG_IO owned */ |
| 2087 | if ((1 == resp->done) && (!resp->sg_io_owned) && |
| 2088 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { |
| 2089 | resp->done = 2; /* guard against other readers */ |
| 2090 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 2091 | return resp; |
| 2092 | } |
| 2093 | } |
| 2094 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 2095 | return NULL; |
| 2096 | } |
| 2097 | |
| 2098 | /* always adds to end of list */ |
| 2099 | static Sg_request * |
| 2100 | sg_add_request(Sg_fd * sfp) |
| 2101 | { |
| 2102 | int k; |
| 2103 | unsigned long iflags; |
| 2104 | Sg_request *rp = sfp->req_arr; |
| 2105 | |
| 2106 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 2107 | if (!list_empty(&sfp->rq_list)) { |
| 2108 | if (!sfp->cmd_q) |
| 2109 | goto out_unlock; |
| 2110 | |
| 2111 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { |
| 2112 | if (!rp->parentfp) |
| 2113 | break; |
| 2114 | } |
| 2115 | if (k >= SG_MAX_QUEUE) |
| 2116 | goto out_unlock; |
| 2117 | } |
| 2118 | memset(rp, 0, sizeof (Sg_request)); |
| 2119 | rp->parentfp = sfp; |
| 2120 | rp->header.duration = jiffies_to_msecs(jiffies); |
| 2121 | list_add_tail(&rp->entry, &sfp->rq_list); |
| 2122 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 2123 | return rp; |
| 2124 | out_unlock: |
| 2125 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 2126 | return NULL; |
| 2127 | } |
| 2128 | |
| 2129 | /* Return of 1 for found; 0 for not found */ |
| 2130 | static int |
| 2131 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) |
| 2132 | { |
| 2133 | unsigned long iflags; |
| 2134 | int res = 0; |
| 2135 | |
| 2136 | if (!sfp || !srp || list_empty(&sfp->rq_list)) |
| 2137 | return res; |
| 2138 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 2139 | if (!list_empty(&srp->entry)) { |
| 2140 | list_del(&srp->entry); |
| 2141 | srp->parentfp = NULL; |
| 2142 | res = 1; |
| 2143 | } |
| 2144 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 2145 | return res; |
| 2146 | } |
| 2147 | |
| 2148 | static Sg_fd * |
| 2149 | sg_add_sfp(Sg_device * sdp) |
| 2150 | { |
| 2151 | Sg_fd *sfp; |
| 2152 | unsigned long iflags; |
| 2153 | int bufflen; |
| 2154 | |
| 2155 | sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); |
| 2156 | if (!sfp) |
| 2157 | return ERR_PTR(-ENOMEM); |
| 2158 | |
| 2159 | init_waitqueue_head(&sfp->read_wait); |
| 2160 | rwlock_init(&sfp->rq_list_lock); |
| 2161 | INIT_LIST_HEAD(&sfp->rq_list); |
| 2162 | kref_init(&sfp->f_ref); |
| 2163 | mutex_init(&sfp->f_mutex); |
| 2164 | sfp->timeout = SG_DEFAULT_TIMEOUT; |
| 2165 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; |
| 2166 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; |
| 2167 | sfp->cmd_q = SG_DEF_COMMAND_Q; |
| 2168 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; |
| 2169 | sfp->parentdp = sdp; |
| 2170 | write_lock_irqsave(&sdp->sfd_lock, iflags); |
| 2171 | if (atomic_read(&sdp->detaching)) { |
| 2172 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
| 2173 | kfree(sfp); |
| 2174 | return ERR_PTR(-ENODEV); |
| 2175 | } |
| 2176 | list_add_tail(&sfp->sfd_siblings, &sdp->sfds); |
| 2177 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
| 2178 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 2179 | "sg_add_sfp: sfp=0x%p\n", sfp)); |
| 2180 | if (unlikely(sg_big_buff != def_reserved_size)) |
| 2181 | sg_big_buff = def_reserved_size; |
| 2182 | |
| 2183 | bufflen = min_t(int, sg_big_buff, |
| 2184 | max_sectors_bytes(sdp->device->request_queue)); |
| 2185 | sg_build_reserve(sfp, bufflen); |
| 2186 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 2187 | "sg_add_sfp: bufflen=%d, k_use_sg=%d\n", |
| 2188 | sfp->reserve.bufflen, |
| 2189 | sfp->reserve.k_use_sg)); |
| 2190 | |
| 2191 | kref_get(&sdp->d_ref); |
| 2192 | __module_get(THIS_MODULE); |
| 2193 | return sfp; |
| 2194 | } |
| 2195 | |
| 2196 | static void |
| 2197 | sg_remove_sfp_usercontext(struct work_struct *work) |
| 2198 | { |
| 2199 | struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); |
| 2200 | struct sg_device *sdp = sfp->parentdp; |
| 2201 | Sg_request *srp; |
| 2202 | unsigned long iflags; |
| 2203 | |
| 2204 | /* Cleanup any responses which were never read(). */ |
| 2205 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 2206 | while (!list_empty(&sfp->rq_list)) { |
| 2207 | srp = list_first_entry(&sfp->rq_list, Sg_request, entry); |
| 2208 | sg_finish_rem_req(srp); |
| 2209 | list_del(&srp->entry); |
| 2210 | srp->parentfp = NULL; |
| 2211 | } |
| 2212 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 2213 | |
| 2214 | if (sfp->reserve.bufflen > 0) { |
| 2215 | SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, |
| 2216 | "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", |
| 2217 | (int) sfp->reserve.bufflen, |
| 2218 | (int) sfp->reserve.k_use_sg)); |
| 2219 | sg_remove_scat(sfp, &sfp->reserve); |
| 2220 | } |
| 2221 | |
| 2222 | SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, |
| 2223 | "sg_remove_sfp: sfp=0x%p\n", sfp)); |
| 2224 | kfree(sfp); |
| 2225 | |
| 2226 | scsi_device_put(sdp->device); |
| 2227 | kref_put(&sdp->d_ref, sg_device_destroy); |
| 2228 | module_put(THIS_MODULE); |
| 2229 | } |
| 2230 | |
| 2231 | static void |
| 2232 | sg_remove_sfp(struct kref *kref) |
| 2233 | { |
| 2234 | struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); |
| 2235 | struct sg_device *sdp = sfp->parentdp; |
| 2236 | unsigned long iflags; |
| 2237 | |
| 2238 | write_lock_irqsave(&sdp->sfd_lock, iflags); |
| 2239 | list_del(&sfp->sfd_siblings); |
| 2240 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
| 2241 | |
| 2242 | INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); |
| 2243 | schedule_work(&sfp->ew.work); |
| 2244 | } |
| 2245 | |
| 2246 | #ifdef CONFIG_SCSI_PROC_FS |
| 2247 | static int |
| 2248 | sg_idr_max_id(int id, void *p, void *data) |
| 2249 | { |
| 2250 | int *k = data; |
| 2251 | |
| 2252 | if (*k < id) |
| 2253 | *k = id; |
| 2254 | |
| 2255 | return 0; |
| 2256 | } |
| 2257 | |
| 2258 | static int |
| 2259 | sg_last_dev(void) |
| 2260 | { |
| 2261 | int k = -1; |
| 2262 | unsigned long iflags; |
| 2263 | |
| 2264 | read_lock_irqsave(&sg_index_lock, iflags); |
| 2265 | idr_for_each(&sg_index_idr, sg_idr_max_id, &k); |
| 2266 | read_unlock_irqrestore(&sg_index_lock, iflags); |
| 2267 | return k + 1; /* origin 1 */ |
| 2268 | } |
| 2269 | #endif |
| 2270 | |
| 2271 | /* must be called with sg_index_lock held */ |
| 2272 | static Sg_device *sg_lookup_dev(int dev) |
| 2273 | { |
| 2274 | return idr_find(&sg_index_idr, dev); |
| 2275 | } |
| 2276 | |
| 2277 | static Sg_device * |
| 2278 | sg_get_dev(int dev) |
| 2279 | { |
| 2280 | struct sg_device *sdp; |
| 2281 | unsigned long flags; |
| 2282 | |
| 2283 | read_lock_irqsave(&sg_index_lock, flags); |
| 2284 | sdp = sg_lookup_dev(dev); |
| 2285 | if (!sdp) |
| 2286 | sdp = ERR_PTR(-ENXIO); |
| 2287 | else if (atomic_read(&sdp->detaching)) { |
| 2288 | /* If sdp->detaching, then the refcount may already be 0, in |
| 2289 | * which case it would be a bug to do kref_get(). |
| 2290 | */ |
| 2291 | sdp = ERR_PTR(-ENODEV); |
| 2292 | } else |
| 2293 | kref_get(&sdp->d_ref); |
| 2294 | read_unlock_irqrestore(&sg_index_lock, flags); |
| 2295 | |
| 2296 | return sdp; |
| 2297 | } |
| 2298 | |
| 2299 | #ifdef CONFIG_SCSI_PROC_FS |
| 2300 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); |
| 2301 | |
| 2302 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); |
| 2303 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, |
| 2304 | size_t count, loff_t *off); |
| 2305 | static const struct proc_ops adio_proc_ops = { |
| 2306 | .proc_open = sg_proc_single_open_adio, |
| 2307 | .proc_read = seq_read, |
| 2308 | .proc_lseek = seq_lseek, |
| 2309 | .proc_write = sg_proc_write_adio, |
| 2310 | .proc_release = single_release, |
| 2311 | }; |
| 2312 | |
| 2313 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); |
| 2314 | static ssize_t sg_proc_write_dressz(struct file *filp, |
| 2315 | const char __user *buffer, size_t count, loff_t *off); |
| 2316 | static const struct proc_ops dressz_proc_ops = { |
| 2317 | .proc_open = sg_proc_single_open_dressz, |
| 2318 | .proc_read = seq_read, |
| 2319 | .proc_lseek = seq_lseek, |
| 2320 | .proc_write = sg_proc_write_dressz, |
| 2321 | .proc_release = single_release, |
| 2322 | }; |
| 2323 | |
| 2324 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); |
| 2325 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); |
| 2326 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); |
| 2327 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); |
| 2328 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); |
| 2329 | static void dev_seq_stop(struct seq_file *s, void *v); |
| 2330 | static const struct seq_operations dev_seq_ops = { |
| 2331 | .start = dev_seq_start, |
| 2332 | .next = dev_seq_next, |
| 2333 | .stop = dev_seq_stop, |
| 2334 | .show = sg_proc_seq_show_dev, |
| 2335 | }; |
| 2336 | |
| 2337 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); |
| 2338 | static const struct seq_operations devstrs_seq_ops = { |
| 2339 | .start = dev_seq_start, |
| 2340 | .next = dev_seq_next, |
| 2341 | .stop = dev_seq_stop, |
| 2342 | .show = sg_proc_seq_show_devstrs, |
| 2343 | }; |
| 2344 | |
| 2345 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); |
| 2346 | static const struct seq_operations debug_seq_ops = { |
| 2347 | .start = dev_seq_start, |
| 2348 | .next = dev_seq_next, |
| 2349 | .stop = dev_seq_stop, |
| 2350 | .show = sg_proc_seq_show_debug, |
| 2351 | }; |
| 2352 | |
| 2353 | static int |
| 2354 | sg_proc_init(void) |
| 2355 | { |
| 2356 | struct proc_dir_entry *p; |
| 2357 | |
| 2358 | p = proc_mkdir("scsi/sg", NULL); |
| 2359 | if (!p) |
| 2360 | return 1; |
| 2361 | |
| 2362 | proc_create("allow_dio", S_IRUGO | S_IWUSR, p, &adio_proc_ops); |
| 2363 | proc_create_seq("debug", S_IRUGO, p, &debug_seq_ops); |
| 2364 | proc_create("def_reserved_size", S_IRUGO | S_IWUSR, p, &dressz_proc_ops); |
| 2365 | proc_create_single("device_hdr", S_IRUGO, p, sg_proc_seq_show_devhdr); |
| 2366 | proc_create_seq("devices", S_IRUGO, p, &dev_seq_ops); |
| 2367 | proc_create_seq("device_strs", S_IRUGO, p, &devstrs_seq_ops); |
| 2368 | proc_create_single("version", S_IRUGO, p, sg_proc_seq_show_version); |
| 2369 | return 0; |
| 2370 | } |
| 2371 | |
| 2372 | |
| 2373 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) |
| 2374 | { |
| 2375 | seq_printf(s, "%d\n", *((int *)s->private)); |
| 2376 | return 0; |
| 2377 | } |
| 2378 | |
| 2379 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) |
| 2380 | { |
| 2381 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); |
| 2382 | } |
| 2383 | |
| 2384 | static ssize_t |
| 2385 | sg_proc_write_adio(struct file *filp, const char __user *buffer, |
| 2386 | size_t count, loff_t *off) |
| 2387 | { |
| 2388 | int err; |
| 2389 | unsigned long num; |
| 2390 | |
| 2391 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
| 2392 | return -EACCES; |
| 2393 | err = kstrtoul_from_user(buffer, count, 0, &num); |
| 2394 | if (err) |
| 2395 | return err; |
| 2396 | sg_allow_dio = num ? 1 : 0; |
| 2397 | return count; |
| 2398 | } |
| 2399 | |
| 2400 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) |
| 2401 | { |
| 2402 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); |
| 2403 | } |
| 2404 | |
| 2405 | static ssize_t |
| 2406 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, |
| 2407 | size_t count, loff_t *off) |
| 2408 | { |
| 2409 | int err; |
| 2410 | unsigned long k = ULONG_MAX; |
| 2411 | |
| 2412 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
| 2413 | return -EACCES; |
| 2414 | |
| 2415 | err = kstrtoul_from_user(buffer, count, 0, &k); |
| 2416 | if (err) |
| 2417 | return err; |
| 2418 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ |
| 2419 | sg_big_buff = k; |
| 2420 | return count; |
| 2421 | } |
| 2422 | return -ERANGE; |
| 2423 | } |
| 2424 | |
| 2425 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) |
| 2426 | { |
| 2427 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, |
| 2428 | sg_version_date); |
| 2429 | return 0; |
| 2430 | } |
| 2431 | |
| 2432 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) |
| 2433 | { |
| 2434 | seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n"); |
| 2435 | return 0; |
| 2436 | } |
| 2437 | |
| 2438 | struct sg_proc_deviter { |
| 2439 | loff_t index; |
| 2440 | size_t max; |
| 2441 | }; |
| 2442 | |
| 2443 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) |
| 2444 | { |
| 2445 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); |
| 2446 | |
| 2447 | s->private = it; |
| 2448 | if (! it) |
| 2449 | return NULL; |
| 2450 | |
| 2451 | it->index = *pos; |
| 2452 | it->max = sg_last_dev(); |
| 2453 | if (it->index >= it->max) |
| 2454 | return NULL; |
| 2455 | return it; |
| 2456 | } |
| 2457 | |
| 2458 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 2459 | { |
| 2460 | struct sg_proc_deviter * it = s->private; |
| 2461 | |
| 2462 | *pos = ++it->index; |
| 2463 | return (it->index < it->max) ? it : NULL; |
| 2464 | } |
| 2465 | |
| 2466 | static void dev_seq_stop(struct seq_file *s, void *v) |
| 2467 | { |
| 2468 | kfree(s->private); |
| 2469 | } |
| 2470 | |
| 2471 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) |
| 2472 | { |
| 2473 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; |
| 2474 | Sg_device *sdp; |
| 2475 | struct scsi_device *scsidp; |
| 2476 | unsigned long iflags; |
| 2477 | |
| 2478 | read_lock_irqsave(&sg_index_lock, iflags); |
| 2479 | sdp = it ? sg_lookup_dev(it->index) : NULL; |
| 2480 | if ((NULL == sdp) || (NULL == sdp->device) || |
| 2481 | (atomic_read(&sdp->detaching))) |
| 2482 | seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); |
| 2483 | else { |
| 2484 | scsidp = sdp->device; |
| 2485 | seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n", |
| 2486 | scsidp->host->host_no, scsidp->channel, |
| 2487 | scsidp->id, scsidp->lun, (int) scsidp->type, |
| 2488 | 1, |
| 2489 | (int) scsidp->queue_depth, |
| 2490 | (int) scsi_device_busy(scsidp), |
| 2491 | (int) scsi_device_online(scsidp)); |
| 2492 | } |
| 2493 | read_unlock_irqrestore(&sg_index_lock, iflags); |
| 2494 | return 0; |
| 2495 | } |
| 2496 | |
| 2497 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) |
| 2498 | { |
| 2499 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; |
| 2500 | Sg_device *sdp; |
| 2501 | struct scsi_device *scsidp; |
| 2502 | unsigned long iflags; |
| 2503 | |
| 2504 | read_lock_irqsave(&sg_index_lock, iflags); |
| 2505 | sdp = it ? sg_lookup_dev(it->index) : NULL; |
| 2506 | scsidp = sdp ? sdp->device : NULL; |
| 2507 | if (sdp && scsidp && (!atomic_read(&sdp->detaching))) |
| 2508 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", |
| 2509 | scsidp->vendor, scsidp->model, scsidp->rev); |
| 2510 | else |
| 2511 | seq_puts(s, "<no active device>\n"); |
| 2512 | read_unlock_irqrestore(&sg_index_lock, iflags); |
| 2513 | return 0; |
| 2514 | } |
| 2515 | |
| 2516 | /* must be called while holding sg_index_lock */ |
| 2517 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) |
| 2518 | { |
| 2519 | int k, new_interface, blen, usg; |
| 2520 | Sg_request *srp; |
| 2521 | Sg_fd *fp; |
| 2522 | const sg_io_hdr_t *hp; |
| 2523 | const char * cp; |
| 2524 | unsigned int ms; |
| 2525 | |
| 2526 | k = 0; |
| 2527 | list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { |
| 2528 | k++; |
| 2529 | read_lock(&fp->rq_list_lock); /* irqs already disabled */ |
| 2530 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " |
| 2531 | "(res)sgat=%d low_dma=%d\n", k, |
| 2532 | jiffies_to_msecs(fp->timeout), |
| 2533 | fp->reserve.bufflen, |
| 2534 | (int) fp->reserve.k_use_sg, 0); |
| 2535 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", |
| 2536 | (int) fp->cmd_q, (int) fp->force_packid, |
| 2537 | (int) fp->keep_orphan); |
| 2538 | list_for_each_entry(srp, &fp->rq_list, entry) { |
| 2539 | hp = &srp->header; |
| 2540 | new_interface = (hp->interface_id == '\0') ? 0 : 1; |
| 2541 | if (srp->res_used) { |
| 2542 | if (new_interface && |
| 2543 | (SG_FLAG_MMAP_IO & hp->flags)) |
| 2544 | cp = " mmap>> "; |
| 2545 | else |
| 2546 | cp = " rb>> "; |
| 2547 | } else { |
| 2548 | if (SG_INFO_DIRECT_IO_MASK & hp->info) |
| 2549 | cp = " dio>> "; |
| 2550 | else |
| 2551 | cp = " "; |
| 2552 | } |
| 2553 | seq_puts(s, cp); |
| 2554 | blen = srp->data.bufflen; |
| 2555 | usg = srp->data.k_use_sg; |
| 2556 | seq_puts(s, srp->done ? |
| 2557 | ((1 == srp->done) ? "rcv:" : "fin:") |
| 2558 | : "act:"); |
| 2559 | seq_printf(s, " id=%d blen=%d", |
| 2560 | srp->header.pack_id, blen); |
| 2561 | if (srp->done) |
| 2562 | seq_printf(s, " dur=%d", hp->duration); |
| 2563 | else { |
| 2564 | ms = jiffies_to_msecs(jiffies); |
| 2565 | seq_printf(s, " t_o/elap=%d/%d", |
| 2566 | (new_interface ? hp->timeout : |
| 2567 | jiffies_to_msecs(fp->timeout)), |
| 2568 | (ms > hp->duration ? ms - hp->duration : 0)); |
| 2569 | } |
| 2570 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
| 2571 | (int) srp->data.cmd_opcode); |
| 2572 | } |
| 2573 | if (list_empty(&fp->rq_list)) |
| 2574 | seq_puts(s, " No requests active\n"); |
| 2575 | read_unlock(&fp->rq_list_lock); |
| 2576 | } |
| 2577 | } |
| 2578 | |
| 2579 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) |
| 2580 | { |
| 2581 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; |
| 2582 | Sg_device *sdp; |
| 2583 | unsigned long iflags; |
| 2584 | |
| 2585 | if (it && (0 == it->index)) |
| 2586 | seq_printf(s, "max_active_device=%d def_reserved_size=%d\n", |
| 2587 | (int)it->max, sg_big_buff); |
| 2588 | |
| 2589 | read_lock_irqsave(&sg_index_lock, iflags); |
| 2590 | sdp = it ? sg_lookup_dev(it->index) : NULL; |
| 2591 | if (NULL == sdp) |
| 2592 | goto skip; |
| 2593 | read_lock(&sdp->sfd_lock); |
| 2594 | if (!list_empty(&sdp->sfds)) { |
| 2595 | seq_printf(s, " >>> device=%s ", sdp->name); |
| 2596 | if (atomic_read(&sdp->detaching)) |
| 2597 | seq_puts(s, "detaching pending close "); |
| 2598 | else if (sdp->device) { |
| 2599 | struct scsi_device *scsidp = sdp->device; |
| 2600 | |
| 2601 | seq_printf(s, "%d:%d:%d:%llu em=%d", |
| 2602 | scsidp->host->host_no, |
| 2603 | scsidp->channel, scsidp->id, |
| 2604 | scsidp->lun, |
| 2605 | scsidp->host->hostt->emulated); |
| 2606 | } |
| 2607 | seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n", |
| 2608 | sdp->sg_tablesize, sdp->exclude, sdp->open_cnt); |
| 2609 | sg_proc_debug_helper(s, sdp); |
| 2610 | } |
| 2611 | read_unlock(&sdp->sfd_lock); |
| 2612 | skip: |
| 2613 | read_unlock_irqrestore(&sg_index_lock, iflags); |
| 2614 | return 0; |
| 2615 | } |
| 2616 | |
| 2617 | #endif /* CONFIG_SCSI_PROC_FS */ |
| 2618 | |
| 2619 | module_init(init_sg); |
| 2620 | module_exit(exit_sg); |