| /* |
| * History: |
| * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), |
| * to allow user process control of SCSI devices. |
| * Development Sponsored by Killy Corp. NY NY |
| * |
| * Original driver (sg.c): |
| * Copyright (C) 1992 Lawrence Foard |
| * Version 2 and 3 extensions to driver: |
| * Copyright (C) 1998 - 2014 Douglas Gilbert |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2, or (at your option) |
| * any later version. |
| * |
| */ |
| |
| static int sg_version_num = 30536; /* 2 digits for each component */ |
| #define SG_VERSION_STR "3.5.36" |
| |
| /* |
| * D. P. Gilbert (dgilbert@interlog.com), notes: |
| * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First |
| * the kernel/module needs to be built with CONFIG_SCSI_LOGGING |
| * (otherwise the macros compile to empty statements). |
| * |
| */ |
| #include <linux/module.h> |
| |
| #include <linux/fs.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/string.h> |
| #include <linux/mm.h> |
| #include <linux/errno.h> |
| #include <linux/mtio.h> |
| #include <linux/ioctl.h> |
| #include <linux/slab.h> |
| #include <linux/fcntl.h> |
| #include <linux/init.h> |
| #include <linux/poll.h> |
| #include <linux/moduleparam.h> |
| #include <linux/cdev.h> |
| #include <linux/idr.h> |
| #include <linux/seq_file.h> |
| #include <linux/blkdev.h> |
| #include <linux/delay.h> |
| #include <linux/blktrace_api.h> |
| #include <linux/mutex.h> |
| #include <linux/atomic.h> |
| #include <linux/ratelimit.h> |
| #include <linux/uio.h> |
| |
| #include "scsi.h" |
| #include <scsi/scsi_dbg.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi_driver.h> |
| #include <scsi/scsi_ioctl.h> |
| #include <scsi/sg.h> |
| |
| #include "scsi_logging.h" |
| |
| #ifdef CONFIG_SCSI_PROC_FS |
| #include <linux/proc_fs.h> |
| static char *sg_version_date = "20140603"; |
| |
| static int sg_proc_init(void); |
| static void sg_proc_cleanup(void); |
| #endif |
| |
| #define SG_ALLOW_DIO_DEF 0 |
| |
| #define SG_MAX_DEVS 32768 |
| |
| /* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type |
| * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater |
| * than 16 bytes are "variable length" whose length is a multiple of 4 |
| */ |
| #define SG_MAX_CDB_SIZE 252 |
| |
| #define SG_DEFAULT_TIMEOUT mult_frac(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) |
| |
| int sg_big_buff = SG_DEF_RESERVED_SIZE; |
| /* N.B. This variable is readable and writeable via |
| /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer |
| of this size (or less if there is not enough memory) will be reserved |
| for use by this file descriptor. [Deprecated usage: this variable is also |
| readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into |
| the kernel (i.e. it is not a module).] */ |
| static int def_reserved_size = -1; /* picks up init parameter */ |
| static int sg_allow_dio = SG_ALLOW_DIO_DEF; |
| |
| static int scatter_elem_sz = SG_SCATTER_SZ; |
| static int scatter_elem_sz_prev = SG_SCATTER_SZ; |
| |
| #define SG_SECTOR_SZ 512 |
| |
| static int sg_add_device(struct device *, struct class_interface *); |
| static void sg_remove_device(struct device *, struct class_interface *); |
| |
| static DEFINE_IDR(sg_index_idr); |
| static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock |
| file descriptor list for device */ |
| |
| static struct class_interface sg_interface = { |
| .add_dev = sg_add_device, |
| .remove_dev = sg_remove_device, |
| }; |
| |
| typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ |
| unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ |
| unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ |
| unsigned bufflen; /* Size of (aggregate) data buffer */ |
| struct page **pages; |
| int page_order; |
| char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ |
| unsigned char cmd_opcode; /* first byte of command */ |
| } Sg_scatter_hold; |
| |
| struct sg_device; /* forward declarations */ |
| struct sg_fd; |
| |
| typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ |
| struct sg_request *nextrp; /* NULL -> tail request (slist) */ |
| struct sg_fd *parentfp; /* NULL -> not in use */ |
| Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ |
| sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ |
| unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; |
| char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ |
| char orphan; /* 1 -> drop on sight, 0 -> normal */ |
| char sg_io_owned; /* 1 -> packet belongs to SG_IO */ |
| /* done protected by rq_list_lock */ |
| char done; /* 0->before bh, 1->before read, 2->read */ |
| struct request *rq; |
| struct bio *bio; |
| struct execute_work ew; |
| } Sg_request; |
| |
| typedef struct sg_fd { /* holds the state of a file descriptor */ |
| struct list_head sfd_siblings; /* protected by device's sfd_lock */ |
| struct sg_device *parentdp; /* owning device */ |
| wait_queue_head_t read_wait; /* queue read until command done */ |
| rwlock_t rq_list_lock; /* protect access to list in req_arr */ |
| int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ |
| int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ |
| Sg_scatter_hold reserve; /* buffer held for this file descriptor */ |
| unsigned save_scat_len; /* original length of trunc. scat. element */ |
| Sg_request *headrp; /* head of request slist, NULL->empty */ |
| struct fasync_struct *async_qp; /* used by asynchronous notification */ |
| Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ |
| char low_dma; /* as in parent but possibly overridden to 1 */ |
| char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ |
| char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ |
| unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */ |
| char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ |
| char mmap_called; /* 0 -> mmap() never called on this fd */ |
| struct kref f_ref; |
| struct execute_work ew; |
| } Sg_fd; |
| |
| typedef struct sg_device { /* holds the state of each scsi generic device */ |
| struct scsi_device *device; |
| wait_queue_head_t open_wait; /* queue open() when O_EXCL present */ |
| struct mutex open_rel_lock; /* held when in open() or release() */ |
| int sg_tablesize; /* adapter's max scatter-gather table size */ |
| u32 index; /* device index number */ |
| struct list_head sfds; |
| rwlock_t sfd_lock; /* protect access to sfd list */ |
| atomic_t detaching; /* 0->device usable, 1->device detaching */ |
| bool exclude; /* 1->open(O_EXCL) succeeded and is active */ |
| int open_cnt; /* count of opens (perhaps < num(sfds) ) */ |
| char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ |
| struct gendisk *disk; |
| struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ |
| struct kref d_ref; |
| } Sg_device; |
| |
| /* tasklet or soft irq callback */ |
| static void sg_rq_end_io(struct request *rq, int uptodate); |
| static int sg_start_req(Sg_request *srp, unsigned char *cmd); |
| static int sg_finish_rem_req(Sg_request * srp); |
| static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); |
| static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, |
| Sg_request * srp); |
| static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, |
| const char __user *buf, size_t count, int blocking, |
| int read_only, int sg_io_owned, Sg_request **o_srp); |
| static int sg_common_write(Sg_fd * sfp, Sg_request * srp, |
| unsigned char *cmnd, int timeout, int blocking); |
| static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); |
| static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp); |
| static void sg_build_reserve(Sg_fd * sfp, int req_size); |
| static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); |
| static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); |
| static Sg_fd *sg_add_sfp(Sg_device * sdp); |
| static void sg_remove_sfp(struct kref *); |
| static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); |
| static Sg_request *sg_add_request(Sg_fd * sfp); |
| static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); |
| static int sg_res_in_use(Sg_fd * sfp); |
| static Sg_device *sg_get_dev(int dev); |
| static void sg_device_destroy(struct kref *kref); |
| |
| #define SZ_SG_HEADER sizeof(struct sg_header) |
| #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) |
| #define SZ_SG_IOVEC sizeof(sg_iovec_t) |
| #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) |
| |
| #define sg_printk(prefix, sdp, fmt, a...) \ |
| sdev_prefix_printk(prefix, (sdp)->device, \ |
| (sdp)->disk->disk_name, fmt, ##a) |
| |
| static int sg_allow_access(struct file *filp, unsigned char *cmd) |
| { |
| struct sg_fd *sfp = filp->private_data; |
| |
| if (sfp->parentdp->device->type == TYPE_SCANNER) |
| return 0; |
| |
| return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); |
| } |
| |
| static int |
| open_wait(Sg_device *sdp, int flags) |
| { |
| int retval = 0; |
| |
| if (flags & O_EXCL) { |
| while (sdp->open_cnt > 0) { |
| mutex_unlock(&sdp->open_rel_lock); |
| retval = wait_event_interruptible(sdp->open_wait, |
| (atomic_read(&sdp->detaching) || |
| !sdp->open_cnt)); |
| mutex_lock(&sdp->open_rel_lock); |
| |
| if (retval) /* -ERESTARTSYS */ |
| return retval; |
| if (atomic_read(&sdp->detaching)) |
| return -ENODEV; |
| } |
| } else { |
| while (sdp->exclude) { |
| mutex_unlock(&sdp->open_rel_lock); |
| retval = wait_event_interruptible(sdp->open_wait, |
| (atomic_read(&sdp->detaching) || |
| !sdp->exclude)); |
| mutex_lock(&sdp->open_rel_lock); |
| |
| if (retval) /* -ERESTARTSYS */ |
| return retval; |
| if (atomic_read(&sdp->detaching)) |
| return -ENODEV; |
| } |
| } |
| |
| return retval; |
| } |
| |
| /* Returns 0 on success, else a negated errno value */ |
| static int |
| sg_open(struct inode *inode, struct file *filp) |
| { |
| int dev = iminor(inode); |
| int flags = filp->f_flags; |
| struct request_queue *q; |
| Sg_device *sdp; |
| Sg_fd *sfp; |
| int retval; |
| |
| nonseekable_open(inode, filp); |
| if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) |
| return -EPERM; /* Can't lock it with read only access */ |
| sdp = sg_get_dev(dev); |
| if (IS_ERR(sdp)) |
| return PTR_ERR(sdp); |
| |
| SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| "sg_open: flags=0x%x\n", flags)); |
| |
| /* This driver's module count bumped by fops_get in <linux/fs.h> */ |
| /* Prevent the device driver from vanishing while we sleep */ |
| retval = scsi_device_get(sdp->device); |
| if (retval) |
| goto sg_put; |
| |
| retval = scsi_autopm_get_device(sdp->device); |
| if (retval) |
| goto sdp_put; |
| |
| /* scsi_block_when_processing_errors() may block so bypass |
| * check if O_NONBLOCK. Permits SCSI commands to be issued |
| * during error recovery. Tread carefully. */ |
| if (!((flags & O_NONBLOCK) || |
| scsi_block_when_processing_errors(sdp->device))) { |
| retval = -ENXIO; |
| /* we are in error recovery for this device */ |
| goto error_out; |
| } |
| |
| mutex_lock(&sdp->open_rel_lock); |
| if (flags & O_NONBLOCK) { |
| if (flags & O_EXCL) { |
| if (sdp->open_cnt > 0) { |
| retval = -EBUSY; |
| goto error_mutex_locked; |
| } |
| } else { |
| if (sdp->exclude) { |
| retval = -EBUSY; |
| goto error_mutex_locked; |
| } |
| } |
| } else { |
| retval = open_wait(sdp, flags); |
| if (retval) /* -ERESTARTSYS or -ENODEV */ |
| goto error_mutex_locked; |
| } |
| |
| /* N.B. at this point we are holding the open_rel_lock */ |
| if (flags & O_EXCL) |
| sdp->exclude = true; |
| |
| if (sdp->open_cnt < 1) { /* no existing opens */ |
| sdp->sgdebug = 0; |
| q = sdp->device->request_queue; |
| sdp->sg_tablesize = queue_max_segments(q); |
| } |
| sfp = sg_add_sfp(sdp); |
| if (IS_ERR(sfp)) { |
| retval = PTR_ERR(sfp); |
| goto out_undo; |
| } |
| |
| filp->private_data = sfp; |
| sdp->open_cnt++; |
| mutex_unlock(&sdp->open_rel_lock); |
| |
| retval = 0; |
| sg_put: |
| kref_put(&sdp->d_ref, sg_device_destroy); |
| return retval; |
| |
| out_undo: |
| if (flags & O_EXCL) { |
| sdp->exclude = false; /* undo if error */ |
| wake_up_interruptible(&sdp->open_wait); |
| } |
| error_mutex_locked: |
| mutex_unlock(&sdp->open_rel_lock); |
| error_out: |
| scsi_autopm_put_device(sdp->device); |
| sdp_put: |
| scsi_device_put(sdp->device); |
| goto sg_put; |
| } |
| |
| /* Release resources associated with a successful sg_open() |
| * Returns 0 on success, else a negated errno value */ |
| static int |
| sg_release(struct inode *inode, struct file *filp) |
| { |
| Sg_device *sdp; |
| Sg_fd *sfp; |
| |
| if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| return -ENXIO; |
| SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n")); |
| |
| mutex_lock(&sdp->open_rel_lock); |
| scsi_autopm_put_device(sdp->device); |
| kref_put(&sfp->f_ref, sg_remove_sfp); |
| sdp->open_cnt--; |
| |
| /* possibly many open()s waiting on exlude clearing, start many; |
| * only open(O_EXCL)s wait on 0==open_cnt so only start one */ |
| if (sdp->exclude) { |
| sdp->exclude = false; |
| wake_up_interruptible_all(&sdp->open_wait); |
| } else if (0 == sdp->open_cnt) { |
| wake_up_interruptible(&sdp->open_wait); |
| } |
| mutex_unlock(&sdp->open_rel_lock); |
| return 0; |
| } |
| |
| static ssize_t |
| sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) |
| { |
| Sg_device *sdp; |
| Sg_fd *sfp; |
| Sg_request *srp; |
| int req_pack_id = -1; |
| sg_io_hdr_t *hp; |
| struct sg_header *old_hdr = NULL; |
| int retval = 0; |
| |
| if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| return -ENXIO; |
| SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| "sg_read: count=%d\n", (int) count)); |
| |
| if (!access_ok(VERIFY_WRITE, buf, count)) |
| return -EFAULT; |
| if (sfp->force_packid && (count >= SZ_SG_HEADER)) { |
| old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
| if (!old_hdr) |
| return -ENOMEM; |
| if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { |
| retval = -EFAULT; |
| goto free_old_hdr; |
| } |
| if (old_hdr->reply_len < 0) { |
| if (count >= SZ_SG_IO_HDR) { |
| sg_io_hdr_t *new_hdr; |
| new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); |
| if (!new_hdr) { |
| retval = -ENOMEM; |
| goto free_old_hdr; |
| } |
| retval =__copy_from_user |
| (new_hdr, buf, SZ_SG_IO_HDR); |
| req_pack_id = new_hdr->pack_id; |
| kfree(new_hdr); |
| if (retval) { |
| retval = -EFAULT; |
| goto free_old_hdr; |
| } |
| } |
| } else |
| req_pack_id = old_hdr->pack_id; |
| } |
| srp = sg_get_rq_mark(sfp, req_pack_id); |
| if (!srp) { /* now wait on packet to arrive */ |
| if (atomic_read(&sdp->detaching)) { |
| retval = -ENODEV; |
| goto free_old_hdr; |
| } |
| if (filp->f_flags & O_NONBLOCK) { |
| retval = -EAGAIN; |
| goto free_old_hdr; |
| } |
| retval = wait_event_interruptible(sfp->read_wait, |
| (atomic_read(&sdp->detaching) || |
| (srp = sg_get_rq_mark(sfp, req_pack_id)))); |
| if (atomic_read(&sdp->detaching)) { |
| retval = -ENODEV; |
| goto free_old_hdr; |
| } |
| if (retval) { |
| /* -ERESTARTSYS as signal hit process */ |
| goto free_old_hdr; |
| } |
| } |
| if (srp->header.interface_id != '\0') { |
| retval = sg_new_read(sfp, buf, count, srp); |
| goto free_old_hdr; |
| } |
| |
| hp = &srp->header; |
| if (old_hdr == NULL) { |
| old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
| if (! old_hdr) { |
| retval = -ENOMEM; |
| goto free_old_hdr; |
| } |
| } |
| memset(old_hdr, 0, SZ_SG_HEADER); |
| old_hdr->reply_len = (int) hp->timeout; |
| old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ |
| old_hdr->pack_id = hp->pack_id; |
| old_hdr->twelve_byte = |
| ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
| old_hdr->target_status = hp->masked_status; |
| old_hdr->host_status = hp->host_status; |
| old_hdr->driver_status = hp->driver_status; |
| if ((CHECK_CONDITION & hp->masked_status) || |
| (DRIVER_SENSE & hp->driver_status)) |
| memcpy(old_hdr->sense_buffer, srp->sense_b, |
| sizeof (old_hdr->sense_buffer)); |
| switch (hp->host_status) { |
| /* This setup of 'result' is for backward compatibility and is best |
| ignored by the user who should use target, host + driver status */ |
| case DID_OK: |
| case DID_PASSTHROUGH: |
| case DID_SOFT_ERROR: |
| old_hdr->result = 0; |
| break; |
| case DID_NO_CONNECT: |
| case DID_BUS_BUSY: |
| case DID_TIME_OUT: |
| old_hdr->result = EBUSY; |
| break; |
| case DID_BAD_TARGET: |
| case DID_ABORT: |
| case DID_PARITY: |
| case DID_RESET: |
| case DID_BAD_INTR: |
| old_hdr->result = EIO; |
| break; |
| case DID_ERROR: |
| old_hdr->result = (srp->sense_b[0] == 0 && |
| hp->masked_status == GOOD) ? 0 : EIO; |
| break; |
| default: |
| old_hdr->result = EIO; |
| break; |
| } |
| |
| /* Now copy the result back to the user buffer. */ |
| if (count >= SZ_SG_HEADER) { |
| if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
| retval = -EFAULT; |
| goto free_old_hdr; |
| } |
| buf += SZ_SG_HEADER; |
| if (count > old_hdr->reply_len) |
| count = old_hdr->reply_len; |
| if (count > SZ_SG_HEADER) { |
| if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
| retval = -EFAULT; |
| goto free_old_hdr; |
| } |
| } |
| } else |
| count = (old_hdr->result == 0) ? 0 : -EIO; |
| sg_finish_rem_req(srp); |
| retval = count; |
| free_old_hdr: |
| kfree(old_hdr); |
| return retval; |
| } |
| |
| static ssize_t |
| sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) |
| { |
| sg_io_hdr_t *hp = &srp->header; |
| int err = 0, err2; |
| int len; |
| |
| if (count < SZ_SG_IO_HDR) { |
| err = -EINVAL; |
| goto err_out; |
| } |
| hp->sb_len_wr = 0; |
| if ((hp->mx_sb_len > 0) && hp->sbp) { |
| if ((CHECK_CONDITION & hp->masked_status) || |
| (DRIVER_SENSE & hp->driver_status)) { |
| int sb_len = SCSI_SENSE_BUFFERSIZE; |
| sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; |
| len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ |
| len = (len > sb_len) ? sb_len : len; |
| if (copy_to_user(hp->sbp, srp->sense_b, len)) { |
| err = -EFAULT; |
| goto err_out; |
| } |
| hp->sb_len_wr = len; |
| } |
| } |
| if (hp->masked_status || hp->host_status || hp->driver_status) |
| hp->info |= SG_INFO_CHECK; |
| if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { |
| err = -EFAULT; |
| goto err_out; |
| } |
| err_out: |
| err2 = sg_finish_rem_req(srp); |
| return err ? : err2 ? : count; |
| } |
| |
| static ssize_t |
| sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) |
| { |
| int mxsize, cmd_size, k; |
| int input_size, blocking; |
| unsigned char opcode; |
| Sg_device *sdp; |
| Sg_fd *sfp; |
| Sg_request *srp; |
| struct sg_header old_hdr; |
| sg_io_hdr_t *hp; |
| unsigned char cmnd[SG_MAX_CDB_SIZE]; |
| |
| if (unlikely(segment_eq(get_fs(), KERNEL_DS))) |
| return -EINVAL; |
| |
| if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| return -ENXIO; |
| SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| "sg_write: count=%d\n", (int) count)); |
| if (atomic_read(&sdp->detaching)) |
| return -ENODEV; |
| if (!((filp->f_flags & O_NONBLOCK) || |
| scsi_block_when_processing_errors(sdp->device))) |
| return -ENXIO; |
| |
| if (!access_ok(VERIFY_READ, buf, count)) |
| return -EFAULT; /* protects following copy_from_user()s + get_user()s */ |
| if (count < SZ_SG_HEADER) |
| return -EIO; |
| if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) |
| return -EFAULT; |
| blocking = !(filp->f_flags & O_NONBLOCK); |
| if (old_hdr.reply_len < 0) |
| return sg_new_write(sfp, filp, buf, count, |
| blocking, 0, 0, NULL); |
| if (count < (SZ_SG_HEADER + 6)) |
| return -EIO; /* The minimum scsi command length is 6 bytes. */ |
| |
| if (!(srp = sg_add_request(sfp))) { |
| SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp, |
| "sg_write: queue full\n")); |
| return -EDOM; |
| } |
| buf += SZ_SG_HEADER; |
| __get_user(opcode, buf); |
| if (sfp->next_cmd_len > 0) { |
| cmd_size = sfp->next_cmd_len; |
| sfp->next_cmd_len = 0; /* reset so only this write() effected */ |
| } else { |
| cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ |
| if ((opcode >= 0xc0) && old_hdr.twelve_byte) |
| cmd_size = 12; |
| } |
| SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, |
| "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); |
| /* Determine buffer size. */ |
| input_size = count - cmd_size; |
| mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; |
| mxsize -= SZ_SG_HEADER; |
| input_size -= SZ_SG_HEADER; |
| if (input_size < 0) { |
| sg_remove_request(sfp, srp); |
| return -EIO; /* User did not pass enough bytes for this command. */ |
| } |
| hp = &srp->header; |
| hp->interface_id = '\0'; /* indicator of old interface tunnelled */ |
| hp->cmd_len = (unsigned char) cmd_size; |
| hp->iovec_count = 0; |
| hp->mx_sb_len = 0; |
| if (input_size > 0) |
| hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? |
| SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; |
| else |
| hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; |
| hp->dxfer_len = mxsize; |
| if ((hp->dxfer_direction == SG_DXFER_TO_DEV) || |
| (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)) |
| hp->dxferp = (char __user *)buf + cmd_size; |
| else |
| hp->dxferp = NULL; |
| hp->sbp = NULL; |
| hp->timeout = old_hdr.reply_len; /* structure abuse ... */ |
| hp->flags = input_size; /* structure abuse ... */ |
| hp->pack_id = old_hdr.pack_id; |
| hp->usr_ptr = NULL; |
| if (__copy_from_user(cmnd, buf, cmd_size)) |
| return -EFAULT; |
| /* |
| * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, |
| * but is is possible that the app intended SG_DXFER_TO_DEV, because there |
| * is a non-zero input_size, so emit a warning. |
| */ |
| if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { |
| static char cmd[TASK_COMM_LEN]; |
| if (strcmp(current->comm, cmd)) { |
| printk_ratelimited(KERN_WARNING |
| "sg_write: data in/out %d/%d bytes " |
| "for SCSI command 0x%x-- guessing " |
| "data in;\n program %s not setting " |
| "count and/or reply_len properly\n", |
| old_hdr.reply_len - (int)SZ_SG_HEADER, |
| input_size, (unsigned int) cmnd[0], |
| current->comm); |
| strcpy(cmd, current->comm); |
| } |
| } |
| k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); |
| return (k < 0) ? k : count; |
| } |
| |
| static ssize_t |
| sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, |
| size_t count, int blocking, int read_only, int sg_io_owned, |
| Sg_request **o_srp) |
| { |
| int k; |
| Sg_request *srp; |
| sg_io_hdr_t *hp; |
| unsigned char cmnd[SG_MAX_CDB_SIZE]; |
| int timeout; |
| unsigned long ul_timeout; |
| |
| if (count < SZ_SG_IO_HDR) |
| return -EINVAL; |
| if (!access_ok(VERIFY_READ, buf, count)) |
| return -EFAULT; /* protects following copy_from_user()s + get_user()s */ |
| |
| sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ |
| if (!(srp = sg_add_request(sfp))) { |
| SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_new_write: queue full\n")); |
| return -EDOM; |
| } |
| srp->sg_io_owned = sg_io_owned; |
| hp = &srp->header; |
| if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { |
| sg_remove_request(sfp, srp); |
| return -EFAULT; |
| } |
| if (hp->interface_id != 'S') { |
| sg_remove_request(sfp, srp); |
| return -ENOSYS; |
| } |
| if (hp->flags & SG_FLAG_MMAP_IO) { |
| if (hp->dxfer_len > sfp->reserve.bufflen) { |
| sg_remove_request(sfp, srp); |
| return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ |
| } |
| if (hp->flags & SG_FLAG_DIRECT_IO) { |
| sg_remove_request(sfp, srp); |
| return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ |
| } |
| if (sg_res_in_use(sfp)) { |
| sg_remove_request(sfp, srp); |
| return -EBUSY; /* reserve buffer already being used */ |
| } |
| } |
| ul_timeout = msecs_to_jiffies(srp->header.timeout); |
| timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; |
| if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { |
| sg_remove_request(sfp, srp); |
| return -EMSGSIZE; |
| } |
| if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { |
| sg_remove_request(sfp, srp); |
| return -EFAULT; /* protects following copy_from_user()s + get_user()s */ |
| } |
| if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { |
| sg_remove_request(sfp, srp); |
| return -EFAULT; |
| } |
| if (read_only && sg_allow_access(file, cmnd)) { |
| sg_remove_request(sfp, srp); |
| return -EPERM; |
| } |
| k = sg_common_write(sfp, srp, cmnd, timeout, blocking); |
| if (k < 0) |
| return k; |
| if (o_srp) |
| *o_srp = srp; |
| return count; |
| } |
| |
| static int |
| sg_common_write(Sg_fd * sfp, Sg_request * srp, |
| unsigned char *cmnd, int timeout, int blocking) |
| { |
| int k, at_head; |
| Sg_device *sdp = sfp->parentdp; |
| sg_io_hdr_t *hp = &srp->header; |
| |
| srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ |
| hp->status = 0; |
| hp->masked_status = 0; |
| hp->msg_status = 0; |
| hp->info = 0; |
| hp->host_status = 0; |
| hp->driver_status = 0; |
| hp->resid = 0; |
| SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", |
| (int) cmnd[0], (int) hp->cmd_len)); |
| |
| k = sg_start_req(srp, cmnd); |
| if (k) { |
| SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_common_write: start_req err=%d\n", k)); |
| sg_finish_rem_req(srp); |
| return k; /* probably out of space --> ENOMEM */ |
| } |
| if (atomic_read(&sdp->detaching)) { |
| if (srp->bio) { |
| if (srp->rq->cmd != srp->rq->__cmd) |
| kfree(srp->rq->cmd); |
| |
| blk_end_request_all(srp->rq, -EIO); |
| srp->rq = NULL; |
| } |
| |
| sg_finish_rem_req(srp); |
| return -ENODEV; |
| } |
| |
| hp->duration = jiffies_to_msecs(jiffies); |
| if (hp->interface_id != '\0' && /* v3 (or later) interface */ |
| (SG_FLAG_Q_AT_TAIL & hp->flags)) |
| at_head = 0; |
| else |
| at_head = 1; |
| |
| if (likely(!sdp->device->timeout_override)) |
| srp->rq->timeout = timeout; |
| else |
| srp->rq->timeout = sdp->device->timeout_override; |
| |
| kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ |
| blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, |
| srp->rq, at_head, sg_rq_end_io); |
| return 0; |
| } |
| |
| static int srp_done(Sg_fd *sfp, Sg_request *srp) |
| { |
| unsigned long flags; |
| int ret; |
| |
| read_lock_irqsave(&sfp->rq_list_lock, flags); |
| ret = srp->done; |
| read_unlock_irqrestore(&sfp->rq_list_lock, flags); |
| return ret; |
| } |
| |
| static int max_sectors_bytes(struct request_queue *q) |
| { |
| unsigned int max_sectors = queue_max_sectors(q); |
| |
| max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); |
| |
| return max_sectors << 9; |
| } |
| |
| static long |
| sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) |
| { |
| void __user *p = (void __user *)arg; |
| int __user *ip = p; |
| int result, val, read_only; |
| Sg_device *sdp; |
| Sg_fd *sfp; |
| Sg_request *srp; |
| unsigned long iflags; |
| |
| if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| return -ENXIO; |
| |
| SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| "sg_ioctl: cmd=0x%x\n", (int) cmd_in)); |
| read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); |
| |
| switch (cmd_in) { |
| case SG_IO: |
| if (atomic_read(&sdp->detaching)) |
| return -ENODEV; |
| if (!scsi_block_when_processing_errors(sdp->device)) |
| return -ENXIO; |
| if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) |
| return -EFAULT; |
| result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, |
| 1, read_only, 1, &srp); |
| if (result < 0) |
| return result; |
| result = wait_event_interruptible(sfp->read_wait, |
| (srp_done(sfp, srp) || atomic_read(&sdp->detaching))); |
| if (atomic_read(&sdp->detaching)) |
| return -ENODEV; |
| write_lock_irq(&sfp->rq_list_lock); |
| if (srp->done) { |
| srp->done = 2; |
| write_unlock_irq(&sfp->rq_list_lock); |
| result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); |
| return (result < 0) ? result : 0; |
| } |
| srp->orphan = 1; |
| write_unlock_irq(&sfp->rq_list_lock); |
| return result; /* -ERESTARTSYS because signal hit process */ |
| case SG_SET_TIMEOUT: |
| result = get_user(val, ip); |
| if (result) |
| return result; |
| if (val < 0) |
| return -EIO; |
| if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ)) |
| val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ), |
| INT_MAX); |
| sfp->timeout_user = val; |
| sfp->timeout = mult_frac(val, HZ, USER_HZ); |
| |
| return 0; |
| case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ |
| /* strange ..., for backward compatibility */ |
| return sfp->timeout_user; |
| case SG_SET_FORCE_LOW_DMA: |
| result = get_user(val, ip); |
| if (result) |
| return result; |
| if (val) { |
| sfp->low_dma = 1; |
| if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { |
| val = (int) sfp->reserve.bufflen; |
| sg_remove_scat(sfp, &sfp->reserve); |
| sg_build_reserve(sfp, val); |
| } |
| } else { |
| if (atomic_read(&sdp->detaching)) |
| return -ENODEV; |
| sfp->low_dma = sdp->device->host->unchecked_isa_dma; |
| } |
| return 0; |
| case SG_GET_LOW_DMA: |
| return put_user((int) sfp->low_dma, ip); |
| case SG_GET_SCSI_ID: |
| if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) |
| return -EFAULT; |
| else { |
| sg_scsi_id_t __user *sg_idp = p; |
| |
| if (atomic_read(&sdp->detaching)) |
| return -ENODEV; |
| __put_user((int) sdp->device->host->host_no, |
| &sg_idp->host_no); |
| __put_user((int) sdp->device->channel, |
| &sg_idp->channel); |
| __put_user((int) sdp->device->id, &sg_idp->scsi_id); |
| __put_user((int) sdp->device->lun, &sg_idp->lun); |
| __put_user((int) sdp->device->type, &sg_idp->scsi_type); |
| __put_user((short) sdp->device->host->cmd_per_lun, |
| &sg_idp->h_cmd_per_lun); |
| __put_user((short) sdp->device->queue_depth, |
| &sg_idp->d_queue_depth); |
| __put_user(0, &sg_idp->unused[0]); |
| __put_user(0, &sg_idp->unused[1]); |
| return 0; |
| } |
| case SG_SET_FORCE_PACK_ID: |
| result = get_user(val, ip); |
| if (result) |
| return result; |
| sfp->force_packid = val ? 1 : 0; |
| return 0; |
| case SG_GET_PACK_ID: |
| if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) |
| return -EFAULT; |
| read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| for (srp = sfp->headrp; srp; srp = srp->nextrp) { |
| if ((1 == srp->done) && (!srp->sg_io_owned)) { |
| read_unlock_irqrestore(&sfp->rq_list_lock, |
| iflags); |
| __put_user(srp->header.pack_id, ip); |
| return 0; |
| } |
| } |
| read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| __put_user(-1, ip); |
| return 0; |
| case SG_GET_NUM_WAITING: |
| read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { |
| if ((1 == srp->done) && (!srp->sg_io_owned)) |
| ++val; |
| } |
| read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| return put_user(val, ip); |
| case SG_GET_SG_TABLESIZE: |
| return put_user(sdp->sg_tablesize, ip); |
| case SG_SET_RESERVED_SIZE: |
| result = get_user(val, ip); |
| if (result) |
| return result; |
| if (val < 0) |
| return -EINVAL; |
| val = min_t(int, val, |
| max_sectors_bytes(sdp->device->request_queue)); |
| if (val != sfp->reserve.bufflen) { |
| if (sg_res_in_use(sfp) || sfp->mmap_called) |
| return -EBUSY; |
| sg_remove_scat(sfp, &sfp->reserve); |
| sg_build_reserve(sfp, val); |
| } |
| return 0; |
| case SG_GET_RESERVED_SIZE: |
| val = min_t(int, sfp->reserve.bufflen, |
| max_sectors_bytes(sdp->device->request_queue)); |
| return put_user(val, ip); |
| case SG_SET_COMMAND_Q: |
| result = get_user(val, ip); |
| if (result) |
| return result; |
| sfp->cmd_q = val ? 1 : 0; |
| return 0; |
| case SG_GET_COMMAND_Q: |
| return put_user((int) sfp->cmd_q, ip); |
| case SG_SET_KEEP_ORPHAN: |
| result = get_user(val, ip); |
| if (result) |
| return result; |
| sfp->keep_orphan = val; |
| return 0; |
| case SG_GET_KEEP_ORPHAN: |
| return put_user((int) sfp->keep_orphan, ip); |
| case SG_NEXT_CMD_LEN: |
| result = get_user(val, ip); |
| if (result) |
| return result; |
| sfp->next_cmd_len = (val > 0) ? val : 0; |
| return 0; |
| case SG_GET_VERSION_NUM: |
| return put_user(sg_version_num, ip); |
| case SG_GET_ACCESS_COUNT: |
| /* faked - we don't have a real access count anymore */ |
| val = (sdp->device ? 1 : 0); |
| return put_user(val, ip); |
| case SG_GET_REQUEST_TABLE: |
| if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) |
| return -EFAULT; |
| else { |
| sg_req_info_t *rinfo; |
| unsigned int ms; |
| |
| rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, |
| GFP_KERNEL); |
| if (!rinfo) |
| return -ENOMEM; |
| read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; |
| ++val, srp = srp ? srp->nextrp : srp) { |
| memset(&rinfo[val], 0, SZ_SG_REQ_INFO); |
| if (srp) { |
| rinfo[val].req_state = srp->done + 1; |
| rinfo[val].problem = |
| srp->header.masked_status & |
| srp->header.host_status & |
| srp->header.driver_status; |
| if (srp->done) |
| rinfo[val].duration = |
| srp->header.duration; |
| else { |
| ms = jiffies_to_msecs(jiffies); |
| rinfo[val].duration = |
| (ms > srp->header.duration) ? |
| (ms - srp->header.duration) : 0; |
| } |
| rinfo[val].orphan = srp->orphan; |
| rinfo[val].sg_io_owned = |
| srp->sg_io_owned; |
| rinfo[val].pack_id = |
| srp->header.pack_id; |
| rinfo[val].usr_ptr = |
| srp->header.usr_ptr; |
| } |
| } |
| read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| result = __copy_to_user(p, rinfo, |
| SZ_SG_REQ_INFO * SG_MAX_QUEUE); |
| result = result ? -EFAULT : 0; |
| kfree(rinfo); |
| return result; |
| } |
| case SG_EMULATED_HOST: |
| if (atomic_read(&sdp->detaching)) |
| return -ENODEV; |
| return put_user(sdp->device->host->hostt->emulated, ip); |
| case SCSI_IOCTL_SEND_COMMAND: |
| if (atomic_read(&sdp->detaching)) |
| return -ENODEV; |
| if (read_only) { |
| unsigned char opcode = WRITE_6; |
| Scsi_Ioctl_Command __user *siocp = p; |
| |
| if (copy_from_user(&opcode, siocp->data, 1)) |
| return -EFAULT; |
| if (sg_allow_access(filp, &opcode)) |
| return -EPERM; |
| } |
| return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); |
| case SG_SET_DEBUG: |
| result = get_user(val, ip); |
| if (result) |
| return result; |
| sdp->sgdebug = (char) val; |
| return 0; |
| case BLKSECTGET: |
| return put_user(max_sectors_bytes(sdp->device->request_queue), |
| ip); |
| case BLKTRACESETUP: |
| return blk_trace_setup(sdp->device->request_queue, |
| sdp->disk->disk_name, |
| MKDEV(SCSI_GENERIC_MAJOR, sdp->index), |
| NULL, |
| (char *)arg); |
| case BLKTRACESTART: |
| return blk_trace_startstop(sdp->device->request_queue, 1); |
| case BLKTRACESTOP: |
| return blk_trace_startstop(sdp->device->request_queue, 0); |
| case BLKTRACETEARDOWN: |
| return blk_trace_remove(sdp->device->request_queue); |
| case SCSI_IOCTL_GET_IDLUN: |
| case SCSI_IOCTL_GET_BUS_NUMBER: |
| case SCSI_IOCTL_PROBE_HOST: |
| case SG_GET_TRANSFORM: |
| case SG_SCSI_RESET: |
| if (atomic_read(&sdp->detaching)) |
| return -ENODEV; |
| break; |
| default: |
| if (read_only) |
| return -EPERM; /* don't know so take safe approach */ |
| break; |
| } |
| |
| result = scsi_ioctl_block_when_processing_errors(sdp->device, |
| cmd_in, filp->f_flags & O_NDELAY); |
| if (result) |
| return result; |
| return scsi_ioctl(sdp->device, cmd_in, p); |
| } |
| |
| #ifdef CONFIG_COMPAT |
| static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) |
| { |
| Sg_device *sdp; |
| Sg_fd *sfp; |
| struct scsi_device *sdev; |
| |
| if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| return -ENXIO; |
| |
| sdev = sdp->device; |
| if (sdev->host->hostt->compat_ioctl) { |
| int ret; |
| |
| ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); |
| |
| return ret; |
| } |
| |
| return -ENOIOCTLCMD; |
| } |
| #endif |
| |
| static unsigned int |
| sg_poll(struct file *filp, poll_table * wait) |
| { |
| unsigned int res = 0; |
| Sg_device *sdp; |
| Sg_fd *sfp; |
| Sg_request *srp; |
| int count = 0; |
| unsigned long iflags; |
| |
| sfp = filp->private_data; |
| if (!sfp) |
| return POLLERR; |
| sdp = sfp->parentdp; |
| if (!sdp) |
| return POLLERR; |
| poll_wait(filp, &sfp->read_wait, wait); |
| read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| for (srp = sfp->headrp; srp; srp = srp->nextrp) { |
| /* if any read waiting, flag it */ |
| if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) |
| res = POLLIN | POLLRDNORM; |
| ++count; |
| } |
| read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| |
| if (atomic_read(&sdp->detaching)) |
| res |= POLLHUP; |
| else if (!sfp->cmd_q) { |
| if (0 == count) |
| res |= POLLOUT | POLLWRNORM; |
| } else if (count < SG_MAX_QUEUE) |
| res |= POLLOUT | POLLWRNORM; |
| SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| "sg_poll: res=0x%x\n", (int) res)); |
| return res; |
| } |
| |
| static int |
| sg_fasync(int fd, struct file *filp, int mode) |
| { |
| Sg_device *sdp; |
| Sg_fd *sfp; |
| |
| if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| return -ENXIO; |
| SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| "sg_fasync: mode=%d\n", mode)); |
| |
| return fasync_helper(fd, filp, mode, &sfp->async_qp); |
| } |
| |
| static int |
| sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| Sg_fd *sfp; |
| unsigned long offset, len, sa; |
| Sg_scatter_hold *rsv_schp; |
| int k, length; |
| |
| if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) |
| return VM_FAULT_SIGBUS; |
| rsv_schp = &sfp->reserve; |
| offset = vmf->pgoff << PAGE_SHIFT; |
| if (offset >= rsv_schp->bufflen) |
| return VM_FAULT_SIGBUS; |
| SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_vma_fault: offset=%lu, scatg=%d\n", |
| offset, rsv_schp->k_use_sg)); |
| sa = vma->vm_start; |
| length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
| for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { |
| len = vma->vm_end - sa; |
| len = (len < length) ? len : length; |
| if (offset < len) { |
| struct page *page = nth_page(rsv_schp->pages[k], |
| offset >> PAGE_SHIFT); |
| get_page(page); /* increment page count */ |
| vmf->page = page; |
| return 0; /* success */ |
| } |
| sa += len; |
| offset -= len; |
| } |
| |
| return VM_FAULT_SIGBUS; |
| } |
| |
| static const struct vm_operations_struct sg_mmap_vm_ops = { |
| .fault = sg_vma_fault, |
| }; |
| |
| static int |
| sg_mmap(struct file *filp, struct vm_area_struct *vma) |
| { |
| Sg_fd *sfp; |
| unsigned long req_sz, len, sa; |
| Sg_scatter_hold *rsv_schp; |
| int k, length; |
| |
| if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) |
| return -ENXIO; |
| req_sz = vma->vm_end - vma->vm_start; |
| SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_mmap starting, vm_start=%p, len=%d\n", |
| (void *) vma->vm_start, (int) req_sz)); |
| if (vma->vm_pgoff) |
| return -EINVAL; /* want no offset */ |
| rsv_schp = &sfp->reserve; |
| if (req_sz > rsv_schp->bufflen) |
| return -ENOMEM; /* cannot map more than reserved buffer */ |
| |
| sa = vma->vm_start; |
| length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
| for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { |
| len = vma->vm_end - sa; |
| len = (len < length) ? len : length; |
| sa += len; |
| } |
| |
| sfp->mmap_called = 1; |
| vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; |
| vma->vm_private_data = sfp; |
| vma->vm_ops = &sg_mmap_vm_ops; |
| return 0; |
| } |
| |
| static void |
| sg_rq_end_io_usercontext(struct work_struct *work) |
| { |
| struct sg_request *srp = container_of(work, struct sg_request, ew.work); |
| struct sg_fd *sfp = srp->parentfp; |
| |
| sg_finish_rem_req(srp); |
| kref_put(&sfp->f_ref, sg_remove_sfp); |
| } |
| |
| /* |
| * This function is a "bottom half" handler that is called by the mid |
| * level when a command is completed (or has failed). |
| */ |
| static void |
| sg_rq_end_io(struct request *rq, int uptodate) |
| { |
| struct sg_request *srp = rq->end_io_data; |
| Sg_device *sdp; |
| Sg_fd *sfp; |
| unsigned long iflags; |
| unsigned int ms; |
| char *sense; |
| int result, resid, done = 1; |
| |
| if (WARN_ON(srp->done != 0)) |
| return; |
| |
| sfp = srp->parentfp; |
| if (WARN_ON(sfp == NULL)) |
| return; |
| |
| sdp = sfp->parentdp; |
| if (unlikely(atomic_read(&sdp->detaching))) |
| pr_info("%s: device detaching\n", __func__); |
| |
| sense = rq->sense; |
| result = rq->errors; |
| resid = rq->resid_len; |
| |
| SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, |
| "sg_cmd_done: pack_id=%d, res=0x%x\n", |
| srp->header.pack_id, result)); |
| srp->header.resid = resid; |
| ms = jiffies_to_msecs(jiffies); |
| srp->header.duration = (ms > srp->header.duration) ? |
| (ms - srp->header.duration) : 0; |
| if (0 != result) { |
| struct scsi_sense_hdr sshdr; |
| |
| srp->header.status = 0xff & result; |
| srp->header.masked_status = status_byte(result); |
| srp->header.msg_status = msg_byte(result); |
| srp->header.host_status = host_byte(result); |
| srp->header.driver_status = driver_byte(result); |
| if ((sdp->sgdebug > 0) && |
| ((CHECK_CONDITION == srp->header.masked_status) || |
| (COMMAND_TERMINATED == srp->header.masked_status))) |
| __scsi_print_sense(sdp->device, __func__, sense, |
| SCSI_SENSE_BUFFERSIZE); |
| |
| /* Following if statement is a patch supplied by Eric Youngdale */ |
| if (driver_byte(result) != 0 |
| && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) |
| && !scsi_sense_is_deferred(&sshdr) |
| && sshdr.sense_key == UNIT_ATTENTION |
| && sdp->device->removable) { |
| /* Detected possible disc change. Set the bit - this */ |
| /* may be used if there are filesystems using this device */ |
| sdp->device->changed = 1; |
| } |
| } |
| /* Rely on write phase to clean out srp status values, so no "else" */ |
| |
| /* |
| * Free the request as soon as it is complete so that its resources |
| * can be reused without waiting for userspace to read() the |
| * result. But keep the associated bio (if any) around until |
| * blk_rq_unmap_user() can be called from user context. |
| */ |
| srp->rq = NULL; |
| if (rq->cmd != rq->__cmd) |
| kfree(rq->cmd); |
| __blk_put_request(rq->q, rq); |
| |
| write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| if (unlikely(srp->orphan)) { |
| if (sfp->keep_orphan) |
| srp->sg_io_owned = 0; |
| else |
| done = 0; |
| } |
| srp->done = done; |
| write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| |
| if (likely(done)) { |
| /* Now wake up any sg_read() that is waiting for this |
| * packet. |
| */ |
| wake_up_interruptible(&sfp->read_wait); |
| kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); |
| kref_put(&sfp->f_ref, sg_remove_sfp); |
| } else { |
| INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); |
| schedule_work(&srp->ew.work); |
| } |
| } |
| |
| static const struct file_operations sg_fops = { |
| .owner = THIS_MODULE, |
| .read = sg_read, |
| .write = sg_write, |
| .poll = sg_poll, |
| .unlocked_ioctl = sg_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = sg_compat_ioctl, |
| #endif |
| .open = sg_open, |
| .mmap = sg_mmap, |
| .release = sg_release, |
| .fasync = sg_fasync, |
| .llseek = no_llseek, |
| }; |
| |
| static struct class *sg_sysfs_class; |
| |
| static int sg_sysfs_valid = 0; |
| |
| static Sg_device * |
| sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) |
| { |
| struct request_queue *q = scsidp->request_queue; |
| Sg_device *sdp; |
| unsigned long iflags; |
| int error; |
| u32 k; |
| |
| sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); |
| if (!sdp) { |
| sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device " |
| "failure\n", __func__); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| idr_preload(GFP_KERNEL); |
| write_lock_irqsave(&sg_index_lock, iflags); |
| |
| error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT); |
| if (error < 0) { |
| if (error == -ENOSPC) { |
| sdev_printk(KERN_WARNING, scsidp, |
| "Unable to attach sg device type=%d, minor number exceeds %d\n", |
| scsidp->type, SG_MAX_DEVS - 1); |
| error = -ENODEV; |
| } else { |
| sdev_printk(KERN_WARNING, scsidp, "%s: idr " |
| "allocation Sg_device failure: %d\n", |
| __func__, error); |
| } |
| goto out_unlock; |
| } |
| k = error; |
| |
| SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp, |
| "sg_alloc: dev=%d \n", k)); |
| sprintf(disk->disk_name, "sg%d", k); |
| disk->first_minor = k; |
| sdp->disk = disk; |
| sdp->device = scsidp; |
| mutex_init(&sdp->open_rel_lock); |
| INIT_LIST_HEAD(&sdp->sfds); |
| init_waitqueue_head(&sdp->open_wait); |
| atomic_set(&sdp->detaching, 0); |
| rwlock_init(&sdp->sfd_lock); |
| sdp->sg_tablesize = queue_max_segments(q); |
| sdp->index = k; |
| kref_init(&sdp->d_ref); |
| error = 0; |
| |
| out_unlock: |
| write_unlock_irqrestore(&sg_index_lock, iflags); |
| idr_preload_end(); |
| |
| if (error) { |
| kfree(sdp); |
| return ERR_PTR(error); |
| } |
| return sdp; |
| } |
| |
| static int |
| sg_add_device(struct device *cl_dev, struct class_interface *cl_intf) |
| { |
| struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
| struct gendisk *disk; |
| Sg_device *sdp = NULL; |
| struct cdev * cdev = NULL; |
| int error; |
| unsigned long iflags; |
| |
| disk = alloc_disk(1); |
| if (!disk) { |
| pr_warn("%s: alloc_disk failed\n", __func__); |
| return -ENOMEM; |
| } |
| disk->major = SCSI_GENERIC_MAJOR; |
| |
| error = -ENOMEM; |
| cdev = cdev_alloc(); |
| if (!cdev) { |
| pr_warn("%s: cdev_alloc failed\n", __func__); |
| goto out; |
| } |
| cdev->owner = THIS_MODULE; |
| cdev->ops = &sg_fops; |
| |
| sdp = sg_alloc(disk, scsidp); |
| if (IS_ERR(sdp)) { |
| pr_warn("%s: sg_alloc failed\n", __func__); |
| error = PTR_ERR(sdp); |
| goto out; |
| } |
| |
| error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); |
| if (error) |
| goto cdev_add_err; |
| |
| sdp->cdev = cdev; |
| if (sg_sysfs_valid) { |
| struct device *sg_class_member; |
| |
| sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, |
| MKDEV(SCSI_GENERIC_MAJOR, |
| sdp->index), |
| sdp, "%s", disk->disk_name); |
| if (IS_ERR(sg_class_member)) { |
| pr_err("%s: device_create failed\n", __func__); |
| error = PTR_ERR(sg_class_member); |
| goto cdev_add_err; |
| } |
| error = sysfs_create_link(&scsidp->sdev_gendev.kobj, |
| &sg_class_member->kobj, "generic"); |
| if (error) |
| pr_err("%s: unable to make symlink 'generic' back " |
| "to sg%d\n", __func__, sdp->index); |
| } else |
| pr_warn("%s: sg_sys Invalid\n", __func__); |
| |
| dev_set_drvdata(cl_dev, sdp); |
| |
| return 0; |
| |
| cdev_add_err: |
| write_lock_irqsave(&sg_index_lock, iflags); |
| idr_remove(&sg_index_idr, sdp->index); |
| write_unlock_irqrestore(&sg_index_lock, iflags); |
| kfree(sdp); |
| |
| out: |
| put_disk(disk); |
| if (cdev) |
| cdev_del(cdev); |
| return error; |
| } |
| |
| static void |
| sg_device_destroy(struct kref *kref) |
| { |
| struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); |
| unsigned long flags; |
| |
| /* CAUTION! Note that the device can still be found via idr_find() |
| * even though the refcount is 0. Therefore, do idr_remove() BEFORE |
| * any other cleanup. |
| */ |
| |
| write_lock_irqsave(&sg_index_lock, flags); |
| idr_remove(&sg_index_idr, sdp->index); |
| write_unlock_irqrestore(&sg_index_lock, flags); |
| |
| SCSI_LOG_TIMEOUT(3, |
| sg_printk(KERN_INFO, sdp, "sg_device_destroy\n")); |
| |
| put_disk(sdp->disk); |
| kfree(sdp); |
| } |
| |
| static void |
| sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf) |
| { |
| struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
| Sg_device *sdp = dev_get_drvdata(cl_dev); |
| unsigned long iflags; |
| Sg_fd *sfp; |
| int val; |
| |
| if (!sdp) |
| return; |
| /* want sdp->detaching non-zero as soon as possible */ |
| val = atomic_inc_return(&sdp->detaching); |
| if (val > 1) |
| return; /* only want to do following once per device */ |
| |
| SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| "%s\n", __func__)); |
| |
| read_lock_irqsave(&sdp->sfd_lock, iflags); |
| list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { |
| wake_up_interruptible_all(&sfp->read_wait); |
| kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); |
| } |
| wake_up_interruptible_all(&sdp->open_wait); |
| read_unlock_irqrestore(&sdp->sfd_lock, iflags); |
| |
| sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); |
| device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); |
| cdev_del(sdp->cdev); |
| sdp->cdev = NULL; |
| |
| kref_put(&sdp->d_ref, sg_device_destroy); |
| } |
| |
| module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); |
| module_param_named(def_reserved_size, def_reserved_size, int, |
| S_IRUGO | S_IWUSR); |
| module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); |
| |
| MODULE_AUTHOR("Douglas Gilbert"); |
| MODULE_DESCRIPTION("SCSI generic (sg) driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_VERSION(SG_VERSION_STR); |
| MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |
| |
| MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " |
| "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); |
| MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); |
| MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); |
| |
| static int __init |
| init_sg(void) |
| { |
| int rc; |
| |
| if (scatter_elem_sz < PAGE_SIZE) { |
| scatter_elem_sz = PAGE_SIZE; |
| scatter_elem_sz_prev = scatter_elem_sz; |
| } |
| if (def_reserved_size >= 0) |
| sg_big_buff = def_reserved_size; |
| else |
| def_reserved_size = sg_big_buff; |
| |
| rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), |
| SG_MAX_DEVS, "sg"); |
| if (rc) |
| return rc; |
| sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); |
| if ( IS_ERR(sg_sysfs_class) ) { |
| rc = PTR_ERR(sg_sysfs_class); |
| goto err_out; |
| } |
| sg_sysfs_valid = 1; |
| rc = scsi_register_interface(&sg_interface); |
| if (0 == rc) { |
| #ifdef CONFIG_SCSI_PROC_FS |
| sg_proc_init(); |
| #endif /* CONFIG_SCSI_PROC_FS */ |
| return 0; |
| } |
| class_destroy(sg_sysfs_class); |
| err_out: |
| unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); |
| return rc; |
| } |
| |
| static void __exit |
| exit_sg(void) |
| { |
| #ifdef CONFIG_SCSI_PROC_FS |
| sg_proc_cleanup(); |
| #endif /* CONFIG_SCSI_PROC_FS */ |
| scsi_unregister_interface(&sg_interface); |
| class_destroy(sg_sysfs_class); |
| sg_sysfs_valid = 0; |
| unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), |
| SG_MAX_DEVS); |
| idr_destroy(&sg_index_idr); |
| } |
| |
| static int |
| sg_start_req(Sg_request *srp, unsigned char *cmd) |
| { |
| int res; |
| struct request *rq; |
| Sg_fd *sfp = srp->parentfp; |
| sg_io_hdr_t *hp = &srp->header; |
| int dxfer_len = (int) hp->dxfer_len; |
| int dxfer_dir = hp->dxfer_direction; |
| unsigned int iov_count = hp->iovec_count; |
| Sg_scatter_hold *req_schp = &srp->data; |
| Sg_scatter_hold *rsv_schp = &sfp->reserve; |
| struct request_queue *q = sfp->parentdp->device->request_queue; |
| struct rq_map_data *md, map_data; |
| int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; |
| unsigned char *long_cmdp = NULL; |
| |
| SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_start_req: dxfer_len=%d\n", |
| dxfer_len)); |
| |
| if (hp->cmd_len > BLK_MAX_CDB) { |
| long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL); |
| if (!long_cmdp) |
| return -ENOMEM; |
| } |
| |
| /* |
| * NOTE |
| * |
| * With scsi-mq enabled, there are a fixed number of preallocated |
| * requests equal in number to shost->can_queue. If all of the |
| * preallocated requests are already in use, then using GFP_ATOMIC with |
| * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL |
| * will cause blk_get_request() to sleep until an active command |
| * completes, freeing up a request. Neither option is ideal, but |
| * GFP_KERNEL is the better choice to prevent userspace from getting an |
| * unexpected EWOULDBLOCK. |
| * |
| * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually |
| * does not sleep except under memory pressure. |
| */ |
| rq = blk_get_request(q, rw, GFP_KERNEL); |
| if (IS_ERR(rq)) { |
| kfree(long_cmdp); |
| return PTR_ERR(rq); |
| } |
| |
| blk_rq_set_block_pc(rq); |
| |
| if (hp->cmd_len > BLK_MAX_CDB) |
| rq->cmd = long_cmdp; |
| memcpy(rq->cmd, cmd, hp->cmd_len); |
| rq->cmd_len = hp->cmd_len; |
| |
| srp->rq = rq; |
| rq->end_io_data = srp; |
| rq->sense = srp->sense_b; |
| rq->retries = SG_DEFAULT_RETRIES; |
| |
| if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) |
| return 0; |
| |
| if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && |
| dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && |
| !sfp->parentdp->device->host->unchecked_isa_dma && |
| blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) |
| md = NULL; |
| else |
| md = &map_data; |
| |
| if (md) { |
| if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) |
| sg_link_reserve(sfp, srp, dxfer_len); |
| else { |
| res = sg_build_indirect(req_schp, sfp, dxfer_len); |
| if (res) |
| return res; |
| } |
| |
| md->pages = req_schp->pages; |
| md->page_order = req_schp->page_order; |
| md->nr_entries = req_schp->k_use_sg; |
| md->offset = 0; |
| md->null_mapped = hp->dxferp ? 0 : 1; |
| if (dxfer_dir == SG_DXFER_TO_FROM_DEV) |
| md->from_user = 1; |
| else |
| md->from_user = 0; |
| } |
| |
| if (iov_count) { |
| struct iovec *iov = NULL; |
| struct iov_iter i; |
| |
| res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i); |
| if (res < 0) |
| return res; |
| |
| iov_iter_truncate(&i, hp->dxfer_len); |
| if (!iov_iter_count(&i)) { |
| kfree(iov); |
| return -EINVAL; |
| } |
| |
| res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC); |
| kfree(iov); |
| } else |
| res = blk_rq_map_user(q, rq, md, hp->dxferp, |
| hp->dxfer_len, GFP_ATOMIC); |
| |
| if (!res) { |
| srp->bio = rq->bio; |
| |
| if (!md) { |
| req_schp->dio_in_use = 1; |
| hp->info |= SG_INFO_DIRECT_IO; |
| } |
| } |
| return res; |
| } |
| |
| static int |
| sg_finish_rem_req(Sg_request *srp) |
| { |
| int ret = 0; |
| |
| Sg_fd *sfp = srp->parentfp; |
| Sg_scatter_hold *req_schp = &srp->data; |
| |
| SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_finish_rem_req: res_used=%d\n", |
| (int) srp->res_used)); |
| if (srp->bio) |
| ret = blk_rq_unmap_user(srp->bio); |
| |
| if (srp->rq) { |
| if (srp->rq->cmd != srp->rq->__cmd) |
| kfree(srp->rq->cmd); |
| blk_put_request(srp->rq); |
| } |
| |
| if (srp->res_used) |
| sg_unlink_reserve(sfp, srp); |
| else |
| sg_remove_scat(sfp, req_schp); |
| |
| sg_remove_request(sfp, srp); |
| |
| return ret; |
| } |
| |
| static int |
| sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) |
| { |
| int sg_bufflen = tablesize * sizeof(struct page *); |
| gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; |
| |
| schp->pages = kzalloc(sg_bufflen, gfp_flags); |
| if (!schp->pages) |
| return -ENOMEM; |
| schp->sglist_len = sg_bufflen; |
| return tablesize; /* number of scat_gath elements allocated */ |
| } |
| |
| static int |
| sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) |
| { |
| int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; |
| int sg_tablesize = sfp->parentdp->sg_tablesize; |
| int blk_size = buff_size, order; |
| gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; |
| |
| if (blk_size < 0) |
| return -EFAULT; |
| if (0 == blk_size) |
| ++blk_size; /* don't know why */ |
| /* round request up to next highest SG_SECTOR_SZ byte boundary */ |
| blk_size = ALIGN(blk_size, SG_SECTOR_SZ); |
| SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_build_indirect: buff_size=%d, blk_size=%d\n", |
| buff_size, blk_size)); |
| |
| /* N.B. ret_sz carried into this block ... */ |
| mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); |
| if (mx_sc_elems < 0) |
| return mx_sc_elems; /* most likely -ENOMEM */ |
| |
| num = scatter_elem_sz; |
| if (unlikely(num != scatter_elem_sz_prev)) { |
| if (num < PAGE_SIZE) { |
| scatter_elem_sz = PAGE_SIZE; |
| scatter_elem_sz_prev = PAGE_SIZE; |
| } else |
| scatter_elem_sz_prev = num; |
| } |
| |
| if (sfp->low_dma) |
| gfp_mask |= GFP_DMA; |
| |
| if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
| gfp_mask |= __GFP_ZERO; |
| |
| order = get_order(num); |
| retry: |
| ret_sz = 1 << (PAGE_SHIFT + order); |
| |
| for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; |
| k++, rem_sz -= ret_sz) { |
| |
| num = (rem_sz > scatter_elem_sz_prev) ? |
| scatter_elem_sz_prev : rem_sz; |
| |
| schp->pages[k] = alloc_pages(gfp_mask, order); |
| if (!schp->pages[k]) |
| goto out; |
| |
| if (num == scatter_elem_sz_prev) { |
| if (unlikely(ret_sz > scatter_elem_sz_prev)) { |
| scatter_elem_sz = ret_sz; |
| scatter_elem_sz_prev = ret_sz; |
| } |
| } |
| |
| SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n", |
| k, num, ret_sz)); |
| } /* end of for loop */ |
| |
| schp->page_order = order; |
| schp->k_use_sg = k; |
| SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", |
| k, rem_sz)); |
| |
| schp->bufflen = blk_size; |
| if (rem_sz > 0) /* must have failed */ |
| return -ENOMEM; |
| return 0; |
| out: |
| for (i = 0; i < k; i++) |
| __free_pages(schp->pages[i], order); |
| |
| if (--order >= 0) |
| goto retry; |
| |
| return -ENOMEM; |
| } |
| |
| static void |
| sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp) |
| { |
| SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); |
| if (schp->pages && schp->sglist_len > 0) { |
| if (!schp->dio_in_use) { |
| int k; |
| |
| for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { |
| SCSI_LOG_TIMEOUT(5, |
| sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_remove_scat: k=%d, pg=0x%p\n", |
| k, schp->pages[k])); |
| __free_pages(schp->pages[k], schp->page_order); |
| } |
| |
| kfree(schp->pages); |
| } |
| } |
| memset(schp, 0, sizeof (*schp)); |
| } |
| |
| static int |
| sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) |
| { |
| Sg_scatter_hold *schp = &srp->data; |
| int k, num; |
| |
| SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, |
| "sg_read_oxfer: num_read_xfer=%d\n", |
| num_read_xfer)); |
| if ((!outp) || (num_read_xfer <= 0)) |
| return 0; |
| |
| num = 1 << (PAGE_SHIFT + schp->page_order); |
| for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { |
| if (num > num_read_xfer) { |
| if (__copy_to_user(outp, page_address(schp->pages[k]), |
| num_read_xfer)) |
| return -EFAULT; |
| break; |
| } else { |
| if (__copy_to_user(outp, page_address(schp->pages[k]), |
| num)) |
| return -EFAULT; |
| num_read_xfer -= num; |
| if (num_read_xfer <= 0) |
| break; |
| outp += num; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void |
| sg_build_reserve(Sg_fd * sfp, int req_size) |
| { |
| Sg_scatter_hold *schp = &sfp->reserve; |
| |
| SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_build_reserve: req_size=%d\n", req_size)); |
| do { |
| if (req_size < PAGE_SIZE) |
| req_size = PAGE_SIZE; |
| if (0 == sg_build_indirect(schp, sfp, req_size)) |
| return; |
| else |
| sg_remove_scat(sfp, schp); |
| req_size >>= 1; /* divide by 2 */ |
| } while (req_size > (PAGE_SIZE / 2)); |
| } |
| |
| static void |
| sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) |
| { |
| Sg_scatter_hold *req_schp = &srp->data; |
| Sg_scatter_hold *rsv_schp = &sfp->reserve; |
| int k, num, rem; |
| |
| srp->res_used = 1; |
| SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_link_reserve: size=%d\n", size)); |
| rem = size; |
| |
| num = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
| for (k = 0; k < rsv_schp->k_use_sg; k++) { |
| if (rem <= num) { |
| req_schp->k_use_sg = k + 1; |
| req_schp->sglist_len = rsv_schp->sglist_len; |
| req_schp->pages = rsv_schp->pages; |
| |
| req_schp->bufflen = size; |
| req_schp->page_order = rsv_schp->page_order; |
| break; |
| } else |
| rem -= num; |
| } |
| |
| if (k >= rsv_schp->k_use_sg) |
| SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
| "sg_link_reserve: BAD size\n")); |
| } |
| |
| static void |
| sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) |
| { |
| Sg_scatter_hold *req_schp = &srp->data; |
| |
| SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, |
| "sg_unlink_reserve: req->k_use_sg=%d\n", |
| (int) req_schp->k_use_sg)); |
| req_schp->k_use_sg = 0; |
| req_schp->bufflen = 0; |
| req_schp->pages = NULL; |
| req_schp->page_order = 0; |
| req_schp->sglist_len = 0; |
| sfp->save_scat_len = 0; |
| srp->res_used = 0; |
| } |
| |
| static Sg_request * |
| sg_get_rq_mark(Sg_fd * sfp, int pack_id) |
| { |
| Sg_request *resp; |
| unsigned long iflags; |
| |
| write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| for (resp = sfp->headrp; resp; resp = resp->nextrp) { |
| /* look for requests that are ready + not SG_IO owned */ |
| if ((1 == resp->done) && (!resp->sg_io_owned) && |
| ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { |
| resp->done = 2; /* guard against other readers */ |
| break; |
| } |
| } |
| write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| return resp; |
| } |
| |
| /* always adds to end of list */ |
| static Sg_request * |
| sg_add_request(Sg_fd * sfp) |
| { |
| int k; |
| unsigned long iflags; |
| Sg_request *resp; |
| Sg_request *rp = sfp->req_arr; |
| |
| write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| resp = sfp->headrp; |
| if (!resp) { |
| memset(rp, 0, sizeof (Sg_request)); |
| rp->parentfp = sfp; |
| resp = rp; |
| sfp->headrp = resp; |
| } else { |
| if (0 == sfp->cmd_q) |
| resp = NULL; /* command queuing disallowed */ |
| else { |
| for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { |
| if (!rp->parentfp) |
| break; |
| } |
| if (k < SG_MAX_QUEUE) { |
| memset(rp, 0, sizeof (Sg_request)); |
| rp->parentfp = sfp; |
| while (resp->nextrp) |
| resp = resp->nextrp; |
| resp->nextrp = rp; |
| resp = rp; |
| } else |
| resp = NULL; |
| } |
| } |
| if (resp) { |
| resp->nextrp = NULL; |
| resp->header.duration = jiffies_to_msecs(jiffies); |
| } |
| write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| return resp; |
| } |
| |
| /* Return of 1 for found; 0 for not found */ |
| static int |
| sg_remove_request(Sg_fd * sfp, Sg_request * srp) |
| { |
| Sg_request *prev_rp; |
| Sg_request *rp; |
| unsigned long iflags; |
| int res = 0; |
| |
| if ((!sfp) || (!srp) || (!sfp->headrp)) |
| return res; |
| write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| prev_rp = sfp->headrp; |
| if (srp == prev_rp) { |
| sfp->headrp = prev_rp->nextrp; |
| prev_rp->parentfp = NULL; |
| res = 1; |
| } else { |
| while ((rp = prev_rp->nextrp)) { |
| if (srp == rp) { |
| prev_rp->nextrp = rp->nextrp; |
| rp->parentfp = NULL; |
| res = 1; |
| break; |
| } |
| prev_rp = rp; |
| } |
| } |
| write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| return res; |
| } |
| |
| static Sg_fd * |
| sg_add_sfp(Sg_device * sdp) |
| { |
| Sg_fd *sfp; |
| unsigned long iflags; |
| int bufflen; |
| |
| sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); |
| if (!sfp) |
| return ERR_PTR(-ENOMEM); |
| |
| init_waitqueue_head(&sfp->read_wait); |
| rwlock_init(&sfp->rq_list_lock); |
| |
| kref_init(&sfp->f_ref); |
| sfp->timeout = SG_DEFAULT_TIMEOUT; |
| sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; |
| sfp->force_packid = SG_DEF_FORCE_PACK_ID; |
| sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? |
| sdp->device->host->unchecked_isa_dma : 1; |
| sfp->cmd_q = SG_DEF_COMMAND_Q; |
| sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; |
| sfp->parentdp = sdp; |
| write_lock_irqsave(&sdp->sfd_lock, iflags); |
| if (atomic_read(&sdp->detaching)) { |
| write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
| return ERR_PTR(-ENODEV); |
| } |
| list_add_tail(&sfp->sfd_siblings, &sdp->sfds); |
| write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
| SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| "sg_add_sfp: sfp=0x%p\n", sfp)); |
| if (unlikely(sg_big_buff != def_reserved_size)) |
| sg_big_buff = def_reserved_size; |
| |
| bufflen = min_t(int, sg_big_buff, |
| max_sectors_bytes(sdp->device->request_queue)); |
| sg_build_reserve(sfp, bufflen); |
| SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| "sg_add_sfp: bufflen=%d, k_use_sg=%d\n", |
| sfp->reserve.bufflen, |
| sfp->reserve.k_use_sg)); |
| |
| kref_get(&sdp->d_ref); |
| __module_get(THIS_MODULE); |
| return sfp; |
| } |
| |
| static void |
| sg_remove_sfp_usercontext(struct work_struct *work) |
| { |
| struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); |
| struct sg_device *sdp = sfp->parentdp; |
| |
| /* Cleanup any responses which were never read(). */ |
| while (sfp->headrp) |
| sg_finish_rem_req(sfp->headrp); |
| |
| if (sfp->reserve.bufflen > 0) { |
| SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, |
| "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", |
| (int) sfp->reserve.bufflen, |
| (int) sfp->reserve.k_use_sg)); |
| sg_remove_scat(sfp, &sfp->reserve); |
| } |
| |
| SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, |
| "sg_remove_sfp: sfp=0x%p\n", sfp)); |
| kfree(sfp); |
| |
| scsi_device_put(sdp->device); |
| kref_put(&sdp->d_ref, sg_device_destroy); |
| module_put(THIS_MODULE); |
| } |
| |
| static void |
| sg_remove_sfp(struct kref *kref) |
| { |
| struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); |
| struct sg_device *sdp = sfp->parentdp; |
| unsigned long iflags; |
| |
| write_lock_irqsave(&sdp->sfd_lock, iflags); |
| list_del(&sfp->sfd_siblings); |
| write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
| |
| INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); |
| schedule_work(&sfp->ew.work); |
| } |
| |
| static int |
| sg_res_in_use(Sg_fd * sfp) |
| { |
| const Sg_request *srp; |
| unsigned long iflags; |
| |
| read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| for (srp = sfp->headrp; srp; srp = srp->nextrp) |
| if (srp->res_used) |
| break; |
| read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| return srp ? 1 : 0; |
| } |
| |
| #ifdef CONFIG_SCSI_PROC_FS |
| static int |
| sg_idr_max_id(int id, void *p, void *data) |
| { |
| int *k = data; |
| |
| if (*k < id) |
| *k = id; |
| |
| return 0; |
| } |
| |
| static int |
| sg_last_dev(void) |
| { |
| int k = -1; |
| unsigned long iflags; |
| |
| read_lock_irqsave(&sg_index_lock, iflags); |
| idr_for_each(&sg_index_idr, sg_idr_max_id, &k); |
| read_unlock_irqrestore(&sg_index_lock, iflags); |
| return k + 1; /* origin 1 */ |
| } |
| #endif |
| |
| /* must be called with sg_index_lock held */ |
| static Sg_device *sg_lookup_dev(int dev) |
| { |
| return idr_find(&sg_index_idr, dev); |
| } |
| |
| static Sg_device * |
| sg_get_dev(int dev) |
| { |
| struct sg_device *sdp; |
| unsigned long flags; |
| |
| read_lock_irqsave(&sg_index_lock, flags); |
| sdp = sg_lookup_dev(dev); |
| if (!sdp) |
| sdp = ERR_PTR(-ENXIO); |
| else if (atomic_read(&sdp->detaching)) { |
| /* If sdp->detaching, then the refcount may already be 0, in |
| * which case it would be a bug to do kref_get(). |
| */ |
| sdp = ERR_PTR(-ENODEV); |
| } else |
| kref_get(&sdp->d_ref); |
| read_unlock_irqrestore(&sg_index_lock, flags); |
| |
| return sdp; |
| } |
| |
| #ifdef CONFIG_SCSI_PROC_FS |
| |
| static struct proc_dir_entry *sg_proc_sgp = NULL; |
| |
| static char sg_proc_sg_dirname[] = "scsi/sg"; |
| |
| static int sg_proc_seq_show_int(struct seq_file *s, void *v); |
| |
| static int sg_proc_single_open_adio(struct inode *inode, struct file *file); |
| static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, |
| size_t count, loff_t *off); |
| static const struct file_operations adio_fops = { |
| .owner = THIS_MODULE, |
| .open = sg_proc_single_open_adio, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .write = sg_proc_write_adio, |
| .release = single_release, |
| }; |
| |
| static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); |
| static ssize_t sg_proc_write_dressz(struct file *filp, |
| const char __user *buffer, size_t count, loff_t *off); |
| static const struct file_operations dressz_fops = { |
| .owner = THIS_MODULE, |
| .open = sg_proc_single_open_dressz, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .write = sg_proc_write_dressz, |
| .release = single_release, |
| }; |
| |
| static int sg_proc_seq_show_version(struct seq_file *s, void *v); |
| static int sg_proc_single_open_version(struct inode *inode, struct file *file); |
| static const struct file_operations version_fops = { |
| .owner = THIS_MODULE, |
| .open = sg_proc_single_open_version, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); |
| static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); |
| static const struct file_operations devhdr_fops = { |
| .owner = THIS_MODULE, |
| .open = sg_proc_single_open_devhdr, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static int sg_proc_seq_show_dev(struct seq_file *s, void *v); |
| static int sg_proc_open_dev(struct inode *inode, struct file *file); |
| static void * dev_seq_start(struct seq_file *s, loff_t *pos); |
| static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); |
| static void dev_seq_stop(struct seq_file *s, void *v); |
| static const struct file_operations dev_fops = { |
| .owner = THIS_MODULE, |
| .open = sg_proc_open_dev, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| static const struct seq_operations dev_seq_ops = { |
| .start = dev_seq_start, |
| .next = dev_seq_next, |
| .stop = dev_seq_stop, |
| .show = sg_proc_seq_show_dev, |
| }; |
| |
| static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); |
| static int sg_proc_open_devstrs(struct inode *inode, struct file *file); |
| static const struct file_operations devstrs_fops = { |
| .owner = THIS_MODULE, |
| .open = sg_proc_open_devstrs, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| static const struct seq_operations devstrs_seq_ops = { |
| .start = dev_seq_start, |
| .next = dev_seq_next, |
| .stop = dev_seq_stop, |
| .show = sg_proc_seq_show_devstrs, |
| }; |
| |
| static int sg_proc_seq_show_debug(struct seq_file *s, void *v); |
| static int sg_proc_open_debug(struct inode *inode, struct file *file); |
| static const struct file_operations debug_fops = { |
| .owner = THIS_MODULE, |
| .open = sg_proc_open_debug, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| static const struct seq_operations debug_seq_ops = { |
| .start = dev_seq_start, |
| .next = dev_seq_next, |
| .stop = dev_seq_stop, |
| .show = sg_proc_seq_show_debug, |
| }; |
| |
| |
| struct sg_proc_leaf { |
| const char * name; |
| const struct file_operations * fops; |
| }; |
| |
| static const struct sg_proc_leaf sg_proc_leaf_arr[] = { |
| {"allow_dio", &adio_fops}, |
| {"debug", &debug_fops}, |
| {"def_reserved_size", &dressz_fops}, |
| {"device_hdr", &devhdr_fops}, |
| {"devices", &dev_fops}, |
| {"device_strs", &devstrs_fops}, |
| {"version", &version_fops} |
| }; |
| |
| static int |
| sg_proc_init(void) |
| { |
| int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
| int k; |
| |
| sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); |
| if (!sg_proc_sgp) |
| return 1; |
| for (k = 0; k < num_leaves; ++k) { |
| const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k]; |
| umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; |
| proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); |
| } |
| return 0; |
| } |
| |
| static void |
| sg_proc_cleanup(void) |
| { |
| int k; |
| int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
| |
| if (!sg_proc_sgp) |
| return; |
| for (k = 0; k < num_leaves; ++k) |
| remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); |
| remove_proc_entry(sg_proc_sg_dirname, NULL); |
| } |
| |
| |
| static int sg_proc_seq_show_int(struct seq_file *s, void *v) |
| { |
| seq_printf(s, "%d\n", *((int *)s->private)); |
| return 0; |
| } |
| |
| static int sg_proc_single_open_adio(struct inode *inode, struct file *file) |
| { |
| return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); |
| } |
| |
| static ssize_t |
| sg_proc_write_adio(struct file *filp, const char __user *buffer, |
| size_t count, loff_t *off) |
| { |
| int err; |
| unsigned long num; |
| |
| if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
| return -EACCES; |
| err = kstrtoul_from_user(buffer, count, 0, &num); |
| if (err) |
| return err; |
| sg_allow_dio = num ? 1 : 0; |
| return count; |
| } |
| |
| static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) |
| { |
| return single_open(file, sg_proc_seq_show_int, &sg_big_buff); |
| } |
| |
| static ssize_t |
| sg_proc_write_dressz(struct file *filp, const char __user *buffer, |
| size_t count, loff_t *off) |
| { |
| int err; |
| unsigned long k = ULONG_MAX; |
| |
| if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
| return -EACCES; |
| |
| err = kstrtoul_from_user(buffer, count, 0, &k); |
| if (err) |
| return err; |
| if (k <= 1048576) { /* limit "big buff" to 1 MB */ |
| sg_big_buff = k; |
| return count; |
| } |
| return -ERANGE; |
| } |
| |
| static int sg_proc_seq_show_version(struct seq_file *s, void *v) |
| { |
| seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, |
| sg_version_date); |
| return 0; |
| } |
| |
| static int sg_proc_single_open_version(struct inode *inode, struct file *file) |
| { |
| return single_open(file, sg_proc_seq_show_version, NULL); |
| } |
| |
| static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) |
| { |
| seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n"); |
| return 0; |
| } |
| |
| static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) |
| { |
| return single_open(file, sg_proc_seq_show_devhdr, NULL); |
| } |
| |
| struct sg_proc_deviter { |
| loff_t index; |
| size_t max; |
| }; |
| |
| static void * dev_seq_start(struct seq_file *s, loff_t *pos) |
| { |
| struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); |
| |
| s->private = it; |
| if (! it) |
| return NULL; |
| |
| it->index = *pos; |
| it->max = sg_last_dev(); |
| if (it->index >= it->max) |
| return NULL; |
| return it; |
| } |
| |
| static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| { |
| struct sg_proc_deviter * it = s->private; |
| |
| *pos = ++it->index; |
| return (it->index < it->max) ? it : NULL; |
| } |
| |
| static void dev_seq_stop(struct seq_file *s, void *v) |
| { |
| kfree(s->private); |
| } |
| |
| static int sg_proc_open_dev(struct inode *inode, struct file *file) |
| { |
| return seq_open(file, &dev_seq_ops); |
| } |
| |
| static int sg_proc_seq_show_dev(struct seq_file *s, void *v) |
| { |
| struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; |
| Sg_device *sdp; |
| struct scsi_device *scsidp; |
| unsigned long iflags; |
| |
| read_lock_irqsave(&sg_index_lock, iflags); |
| sdp = it ? sg_lookup_dev(it->index) : NULL; |
| if ((NULL == sdp) || (NULL == sdp->device) || |
| (atomic_read(&sdp->detaching))) |
| seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); |
| else { |
| scsidp = sdp->device; |
| seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n", |
| scsidp->host->host_no, scsidp->channel, |
| scsidp->id, scsidp->lun, (int) scsidp->type, |
| 1, |
| (int) scsidp->queue_depth, |
| (int) atomic_read(&scsidp->device_busy), |
| (int) scsi_device_online(scsidp)); |
| } |
| read_unlock_irqrestore(&sg_index_lock, iflags); |
| return 0; |
| } |
| |
| static int sg_proc_open_devstrs(struct inode *inode, struct file *file) |
| { |
| return seq_open(file, &devstrs_seq_ops); |
| } |
| |
| static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) |
| { |
| struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; |
| Sg_device *sdp; |
| struct scsi_device *scsidp; |
| unsigned long iflags; |
| |
| read_lock_irqsave(&sg_index_lock, iflags); |
| sdp = it ? sg_lookup_dev(it->index) : NULL; |
| scsidp = sdp ? sdp->device : NULL; |
| if (sdp && scsidp && (!atomic_read(&sdp->detaching))) |
| seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", |
| scsidp->vendor, scsidp->model, scsidp->rev); |
| else |
| seq_puts(s, "<no active device>\n"); |
| read_unlock_irqrestore(&sg_index_lock, iflags); |
| return 0; |
| } |
| |
| /* must be called while holding sg_index_lock */ |
| static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) |
| { |
| int k, m, new_interface, blen, usg; |
| Sg_request *srp; |
| Sg_fd *fp; |
| const sg_io_hdr_t *hp; |
| const char * cp; |
| unsigned int ms; |
| |
| k = 0; |
| list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { |
| k++; |
| read_lock(&fp->rq_list_lock); /* irqs already disabled */ |
| seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " |
| "(res)sgat=%d low_dma=%d\n", k, |
| jiffies_to_msecs(fp->timeout), |
| fp->reserve.bufflen, |
| (int) fp->reserve.k_use_sg, |
| (int) fp->low_dma); |
| seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", |
| (int) fp->cmd_q, (int) fp->force_packid, |
| (int) fp->keep_orphan); |
| for (m = 0, srp = fp->headrp; |
| srp != NULL; |
| ++m, srp = srp->nextrp) { |
| hp = &srp->header; |
| new_interface = (hp->interface_id == '\0') ? 0 : 1; |
| if (srp->res_used) { |
| if (new_interface && |
| (SG_FLAG_MMAP_IO & hp->flags)) |
| cp = " mmap>> "; |
| else |
| cp = " rb>> "; |
| } else { |
| if (SG_INFO_DIRECT_IO_MASK & hp->info) |
| cp = " dio>> "; |
| else |
| cp = " "; |
| } |
| seq_puts(s, cp); |
| blen = srp->data.bufflen; |
| usg = srp->data.k_use_sg; |
| seq_puts(s, srp->done ? |
| ((1 == srp->done) ? "rcv:" : "fin:") |
| : "act:"); |
| seq_printf(s, " id=%d blen=%d", |
| srp->header.pack_id, blen); |
| if (srp->done) |
| seq_printf(s, " dur=%d", hp->duration); |
| else { |
| ms = jiffies_to_msecs(jiffies); |
| seq_printf(s, " t_o/elap=%d/%d", |
| (new_interface ? hp->timeout : |
| jiffies_to_msecs(fp->timeout)), |
| (ms > hp->duration ? ms - hp->duration : 0)); |
| } |
| seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
| (int) srp->data.cmd_opcode); |
| } |
| if (0 == m) |
| seq_puts(s, " No requests active\n"); |
| read_unlock(&fp->rq_list_lock); |
| } |
| } |
| |
| static int sg_proc_open_debug(struct inode *inode, struct file *file) |
| { |
| return seq_open(file, &debug_seq_ops); |
| } |
| |
| static int sg_proc_seq_show_debug(struct seq_file *s, void *v) |
| { |
| struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; |
| Sg_device *sdp; |
| unsigned long iflags; |
| |
| if (it && (0 == it->index)) |
| seq_printf(s, "max_active_device=%d def_reserved_size=%d\n", |
| (int)it->max, sg_big_buff); |
| |
| read_lock_irqsave(&sg_index_lock, iflags); |
| sdp = it ? sg_lookup_dev(it->index) : NULL; |
| if (NULL == sdp) |
| goto skip; |
| read_lock(&sdp->sfd_lock); |
| if (!list_empty(&sdp->sfds)) { |
| seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); |
| if (atomic_read(&sdp->detaching)) |
| seq_puts(s, "detaching pending close "); |
| else if (sdp->device) { |
| struct scsi_device *scsidp = sdp->device; |
| |
| seq_printf(s, "%d:%d:%d:%llu em=%d", |
| scsidp->host->host_no, |
| scsidp->channel, scsidp->id, |
| scsidp->lun, |
| scsidp->host->hostt->emulated); |
| } |
| seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n", |
| sdp->sg_tablesize, sdp->exclude, sdp->open_cnt); |
| sg_proc_debug_helper(s, sdp); |
| } |
| read_unlock(&sdp->sfd_lock); |
| skip: |
| read_unlock_irqrestore(&sg_index_lock, iflags); |
| return 0; |
| } |
| |
| #endif /* CONFIG_SCSI_PROC_FS */ |
| |
| module_init(init_sg); |
| module_exit(exit_sg); |