mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 07:25:14 +07:00
abaf75dd61
We just need to free the request here. Additionally, this is currently wrong for a queue that's using MQ currently, it'll crash. Cc: Doug Gilbert <dgilbert@interlog.com> Cc: linux-scsi@vger.kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2623 lines
71 KiB
C
2623 lines
71 KiB
C
/*
|
|
* 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 <linux/cred.h> /* for sg_check_file_access() */
|
|
|
|
#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);
|
|
#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 list_head entry; /* list entry */
|
|
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 */
|
|
struct mutex f_mutex; /* protect against changes in this fd */
|
|
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 */
|
|
struct list_head rq_list; /* head of request list */
|
|
struct fasync_struct *async_qp; /* used by asynchronous notification */
|
|
Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
|
|
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 */
|
|
char res_in_use; /* 1 -> 'reserve' array in use */
|
|
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, blk_status_t status);
|
|
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 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)
|
|
|
|
/*
|
|
* The SCSI interfaces that use read() and write() as an asynchronous variant of
|
|
* ioctl(..., SG_IO, ...) are fundamentally unsafe, since there are lots of ways
|
|
* to trigger read() and write() calls from various contexts with elevated
|
|
* privileges. This can lead to kernel memory corruption (e.g. if these
|
|
* interfaces are called through splice()) and privilege escalation inside
|
|
* userspace (e.g. if a process with access to such a device passes a file
|
|
* descriptor to a SUID binary as stdin/stdout/stderr).
|
|
*
|
|
* This function provides protection for the legacy API by restricting the
|
|
* calling context.
|
|
*/
|
|
static int sg_check_file_access(struct file *filp, const char *caller)
|
|
{
|
|
if (filp->f_cred != current_real_cred()) {
|
|
pr_err_once("%s: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
|
|
caller, task_tgid_vnr(current), current->comm);
|
|
return -EPERM;
|
|
}
|
|
if (uaccess_kernel()) {
|
|
pr_err_once("%s: process %d (%s) called from kernel context, this is not allowed.\n",
|
|
caller, task_tgid_vnr(current), current->comm);
|
|
return -EACCES;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
|
|
/*
|
|
* This could cause a response to be stranded. Close the associated
|
|
* file descriptor to free up any resources being held.
|
|
*/
|
|
retval = sg_check_file_access(filp, __func__);
|
|
if (retval)
|
|
return retval;
|
|
|
|
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);
|
|
sg_remove_request(sfp, 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);
|
|
sg_remove_request(sfp, 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];
|
|
int retval;
|
|
|
|
retval = sg_check_file_access(filp, __func__);
|
|
if (retval)
|
|
return retval;
|
|
|
|
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);
|
|
mutex_lock(&sfp->f_mutex);
|
|
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;
|
|
}
|
|
mutex_unlock(&sfp->f_mutex);
|
|
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) {
|
|
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);
|
|
}
|
|
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 (sfp->res_in_use) {
|
|
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));
|
|
|
|
if (hp->dxfer_len >= SZ_256M)
|
|
return -EINVAL;
|
|
|
|
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);
|
|
sg_remove_request(sfp, srp);
|
|
return k; /* probably out of space --> ENOMEM */
|
|
}
|
|
if (atomic_read(&sdp->detaching)) {
|
|
if (srp->bio) {
|
|
scsi_req_free_cmd(scsi_req(srp->rq));
|
|
blk_put_request(srp->rq);
|
|
srp->rq = NULL;
|
|
}
|
|
|
|
sg_finish_rem_req(srp);
|
|
sg_remove_request(sfp, 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;
|
|
|
|
srp->rq->timeout = timeout;
|
|
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 void
|
|
sg_fill_request_table(Sg_fd *sfp, sg_req_info_t *rinfo)
|
|
{
|
|
Sg_request *srp;
|
|
int val;
|
|
unsigned int ms;
|
|
|
|
val = 0;
|
|
list_for_each_entry(srp, &sfp->rq_list, entry) {
|
|
if (val >= SG_MAX_QUEUE)
|
|
break;
|
|
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;
|
|
val++;
|
|
}
|
|
}
|
|
|
|
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:
|
|
/*
|
|
* N.B. This ioctl never worked properly, but failed to
|
|
* return an error value. So returning '0' to keep compability
|
|
* with legacy applications.
|
|
*/
|
|
return 0;
|
|
case SG_GET_LOW_DMA:
|
|
return put_user((int) sdp->device->host->unchecked_isa_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);
|
|
list_for_each_entry(srp, &sfp->rq_list, entry) {
|
|
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);
|
|
val = 0;
|
|
list_for_each_entry(srp, &sfp->rq_list, entry) {
|
|
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));
|
|
mutex_lock(&sfp->f_mutex);
|
|
if (val != sfp->reserve.bufflen) {
|
|
if (sfp->mmap_called ||
|
|
sfp->res_in_use) {
|
|
mutex_unlock(&sfp->f_mutex);
|
|
return -EBUSY;
|
|
}
|
|
|
|
sg_remove_scat(sfp, &sfp->reserve);
|
|
sg_build_reserve(sfp, val);
|
|
}
|
|
mutex_unlock(&sfp->f_mutex);
|
|
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;
|
|
if (val > SG_MAX_CDB_SIZE)
|
|
return -ENOMEM;
|
|
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;
|
|
|
|
rinfo = kcalloc(SG_MAX_QUEUE, SZ_SG_REQ_INFO,
|
|
GFP_KERNEL);
|
|
if (!rinfo)
|
|
return -ENOMEM;
|
|
read_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
sg_fill_request_table(sfp, rinfo);
|
|
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;
|
|
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, p);
|
|
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 __poll_t
|
|
sg_poll(struct file *filp, poll_table * wait)
|
|
{
|
|
__poll_t res = 0;
|
|
Sg_device *sdp;
|
|
Sg_fd *sfp;
|
|
Sg_request *srp;
|
|
int count = 0;
|
|
unsigned long iflags;
|
|
|
|
sfp = filp->private_data;
|
|
if (!sfp)
|
|
return EPOLLERR;
|
|
sdp = sfp->parentdp;
|
|
if (!sdp)
|
|
return EPOLLERR;
|
|
poll_wait(filp, &sfp->read_wait, wait);
|
|
read_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
list_for_each_entry(srp, &sfp->rq_list, entry) {
|
|
/* if any read waiting, flag it */
|
|
if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
|
|
res = EPOLLIN | EPOLLRDNORM;
|
|
++count;
|
|
}
|
|
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
|
|
if (atomic_read(&sdp->detaching))
|
|
res |= EPOLLHUP;
|
|
else if (!sfp->cmd_q) {
|
|
if (0 == count)
|
|
res |= EPOLLOUT | EPOLLWRNORM;
|
|
} else if (count < SG_MAX_QUEUE)
|
|
res |= EPOLLOUT | EPOLLWRNORM;
|
|
SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
|
|
"sg_poll: res=0x%x\n", (__force u32) 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 vm_fault_t
|
|
sg_vma_fault(struct vm_fault *vmf)
|
|
{
|
|
struct vm_area_struct *vma = vmf->vma;
|
|
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;
|
|
int ret = 0;
|
|
|
|
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;
|
|
mutex_lock(&sfp->f_mutex);
|
|
if (req_sz > rsv_schp->bufflen) {
|
|
ret = -ENOMEM; /* cannot map more than reserved buffer */
|
|
goto out;
|
|
}
|
|
|
|
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;
|
|
out:
|
|
mutex_unlock(&sfp->f_mutex);
|
|
return ret;
|
|
}
|
|
|
|
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);
|
|
sg_remove_request(sfp, 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, blk_status_t status)
|
|
{
|
|
struct sg_request *srp = rq->end_io_data;
|
|
struct scsi_request *req = scsi_req(rq);
|
|
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 = req->sense;
|
|
result = req->result;
|
|
resid = req->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;
|
|
}
|
|
}
|
|
|
|
if (req->sense_len)
|
|
memcpy(srp->sense_b, req->sense, SCSI_SENSE_BUFFERSIZE);
|
|
|
|
/* 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;
|
|
scsi_req_free_cmd(scsi_req(rq));
|
|
__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__);
|
|
|
|
sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
|
|
"type %d\n", sdp->index, scsidp->type);
|
|
|
|
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
|
|
remove_proc_subtree("scsi/sg", NULL);
|
|
#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;
|
|
struct scsi_request *req;
|
|
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 blk_get_request()
|
|
* will sleep until an active command completes, freeing up a request.
|
|
* Although waiting in an asynchronous interface is less than ideal, we
|
|
* do not want to use BLK_MQ_REQ_NOWAIT here because userspace might
|
|
* not expect an EWOULDBLOCK from this condition.
|
|
*/
|
|
rq = blk_get_request(q, hp->dxfer_direction == SG_DXFER_TO_DEV ?
|
|
REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
|
|
if (IS_ERR(rq)) {
|
|
kfree(long_cmdp);
|
|
return PTR_ERR(rq);
|
|
}
|
|
req = scsi_req(rq);
|
|
|
|
if (hp->cmd_len > BLK_MAX_CDB)
|
|
req->cmd = long_cmdp;
|
|
memcpy(req->cmd, cmd, hp->cmd_len);
|
|
req->cmd_len = hp->cmd_len;
|
|
|
|
srp->rq = rq;
|
|
rq->end_io_data = srp;
|
|
req->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) {
|
|
mutex_lock(&sfp->f_mutex);
|
|
if (dxfer_len <= rsv_schp->bufflen &&
|
|
!sfp->res_in_use) {
|
|
sfp->res_in_use = 1;
|
|
sg_link_reserve(sfp, srp, dxfer_len);
|
|
} else if (hp->flags & SG_FLAG_MMAP_IO) {
|
|
res = -EBUSY; /* sfp->res_in_use == 1 */
|
|
if (dxfer_len > rsv_schp->bufflen)
|
|
res = -ENOMEM;
|
|
mutex_unlock(&sfp->f_mutex);
|
|
return res;
|
|
} else {
|
|
res = sg_build_indirect(req_schp, sfp, dxfer_len);
|
|
if (res) {
|
|
mutex_unlock(&sfp->f_mutex);
|
|
return res;
|
|
}
|
|
}
|
|
mutex_unlock(&sfp->f_mutex);
|
|
|
|
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) {
|
|
scsi_req_free_cmd(scsi_req(srp->rq));
|
|
blk_put_request(srp->rq);
|
|
}
|
|
|
|
if (srp->res_used)
|
|
sg_unlink_reserve(sfp, srp);
|
|
else
|
|
sg_remove_scat(sfp, req_schp);
|
|
|
|
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 | __GFP_ZERO;
|
|
struct sg_device *sdp = sfp->parentdp;
|
|
|
|
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 (sdp->device->host->unchecked_isa_dma)
|
|
gfp_mask |= GFP_DMA;
|
|
|
|
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;
|
|
srp->res_used = 0;
|
|
/* Called without mutex lock to avoid deadlock */
|
|
sfp->res_in_use = 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);
|
|
list_for_each_entry(resp, &sfp->rq_list, entry) {
|
|
/* 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 */
|
|
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
return resp;
|
|
}
|
|
}
|
|
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
return NULL;
|
|
}
|
|
|
|
/* always adds to end of list */
|
|
static Sg_request *
|
|
sg_add_request(Sg_fd * sfp)
|
|
{
|
|
int k;
|
|
unsigned long iflags;
|
|
Sg_request *rp = sfp->req_arr;
|
|
|
|
write_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
if (!list_empty(&sfp->rq_list)) {
|
|
if (!sfp->cmd_q)
|
|
goto out_unlock;
|
|
|
|
for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
|
|
if (!rp->parentfp)
|
|
break;
|
|
}
|
|
if (k >= SG_MAX_QUEUE)
|
|
goto out_unlock;
|
|
}
|
|
memset(rp, 0, sizeof (Sg_request));
|
|
rp->parentfp = sfp;
|
|
rp->header.duration = jiffies_to_msecs(jiffies);
|
|
list_add_tail(&rp->entry, &sfp->rq_list);
|
|
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
return rp;
|
|
out_unlock:
|
|
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
return NULL;
|
|
}
|
|
|
|
/* Return of 1 for found; 0 for not found */
|
|
static int
|
|
sg_remove_request(Sg_fd * sfp, Sg_request * srp)
|
|
{
|
|
unsigned long iflags;
|
|
int res = 0;
|
|
|
|
if (!sfp || !srp || list_empty(&sfp->rq_list))
|
|
return res;
|
|
write_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
if (!list_empty(&srp->entry)) {
|
|
list_del(&srp->entry);
|
|
srp->parentfp = NULL;
|
|
res = 1;
|
|
}
|
|
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);
|
|
INIT_LIST_HEAD(&sfp->rq_list);
|
|
kref_init(&sfp->f_ref);
|
|
mutex_init(&sfp->f_mutex);
|
|
sfp->timeout = SG_DEFAULT_TIMEOUT;
|
|
sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
|
|
sfp->force_packid = SG_DEF_FORCE_PACK_ID;
|
|
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);
|
|
kfree(sfp);
|
|
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;
|
|
Sg_request *srp;
|
|
unsigned long iflags;
|
|
|
|
/* Cleanup any responses which were never read(). */
|
|
write_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
while (!list_empty(&sfp->rq_list)) {
|
|
srp = list_first_entry(&sfp->rq_list, Sg_request, entry);
|
|
sg_finish_rem_req(srp);
|
|
list_del(&srp->entry);
|
|
srp->parentfp = NULL;
|
|
}
|
|
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
|
|
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);
|
|
}
|
|
|
|
#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 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_seq_show_devhdr(struct seq_file *s, void *v);
|
|
static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
|
|
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 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 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 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,
|
|
};
|
|
|
|
static int
|
|
sg_proc_init(void)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
|
|
p = proc_mkdir("scsi/sg", NULL);
|
|
if (!p)
|
|
return 1;
|
|
|
|
proc_create("allow_dio", S_IRUGO | S_IWUSR, p, &adio_fops);
|
|
proc_create_seq("debug", S_IRUGO, p, &debug_seq_ops);
|
|
proc_create("def_reserved_size", S_IRUGO | S_IWUSR, p, &dressz_fops);
|
|
proc_create_single("device_hdr", S_IRUGO, p, sg_proc_seq_show_devhdr);
|
|
proc_create_seq("devices", S_IRUGO, p, &dev_seq_ops);
|
|
proc_create_seq("device_strs", S_IRUGO, p, &devstrs_seq_ops);
|
|
proc_create_single("version", S_IRUGO, p, sg_proc_seq_show_version);
|
|
return 0;
|
|
}
|
|
|
|
|
|
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_seq_show_devhdr(struct seq_file *s, void *v)
|
|
{
|
|
seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
|
|
return 0;
|
|
}
|
|
|
|
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_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_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, 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) sdp->device->host->unchecked_isa_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);
|
|
list_for_each_entry(srp, &fp->rq_list, entry) {
|
|
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 (list_empty(&fp->rq_list))
|
|
seq_puts(s, " No requests active\n");
|
|
read_unlock(&fp->rq_list_lock);
|
|
}
|
|
}
|
|
|
|
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);
|