* Original driver (sg.c):
* Copyright (C) 1992 Lawrence Foard
* Version 2 and 3 extensions to driver:
- * Copyright (C) 1998 - 2005 Douglas Gilbert
- *
- * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
+ * 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
*
*/
-static int sg_version_num = 30534; /* 2 digits for each component */
-#define SG_VERSION_STR "3.5.34"
+static int sg_version_num = 30536; /* 2 digits for each component */
+#define SG_VERSION_STR "3.5.36"
/*
- * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
+ * 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/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
-#include <linux/aio.h>
#include <linux/errno.h>
#include <linux/mtio.h>
#include <linux/ioctl.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>
#ifdef CONFIG_SCSI_PROC_FS
#include <linux/proc_fs.h>
-static char *sg_version_date = "20061027";
+static char *sg_version_date = "20140603";
static int sg_proc_init(void);
static void sg_proc_cleanup(void);
#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
+
/*
* Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
* Then when using 32 bit integers x * m may overflow during the calculation.
#define SG_SECTOR_SZ 512
-static int sg_add(struct device *, struct class_interface *);
-static void sg_remove(struct device *, struct class_interface *);
-
-static DEFINE_SPINLOCK(sg_open_exclusive_lock);
+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,
- .remove_dev = sg_remove,
+ .add_dev = sg_add_device,
+ .remove_dev = sg_remove_device,
};
typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
} Sg_request;
typedef struct sg_fd { /* holds the state of a file descriptor */
- /* sfd_siblings is protected by sg_index_lock */
- struct list_head sfd_siblings;
+ 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 */
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 */
- char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
+ 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;
typedef struct sg_device { /* holds the state of each scsi generic device */
struct scsi_device *device;
- wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
+ 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 */
- /* sfds is protected by sg_index_lock */
struct list_head sfds;
- volatile char detached; /* 0->attached, 1->detached pending removal */
- /* exclude protected by sg_open_exclusive_lock */
- char exclude; /* opened for exclusive access */
+ 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>] */
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_scatter_hold * schp);
+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, int dev);
+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_put_dev(Sg_device *sdp);
+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;
return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
}
-static int get_exclude(Sg_device *sdp)
-{
- unsigned long flags;
- int ret;
-
- spin_lock_irqsave(&sg_open_exclusive_lock, flags);
- ret = sdp->exclude;
- spin_unlock_irqrestore(&sg_open_exclusive_lock, flags);
- return ret;
-}
-
-static int set_exclude(Sg_device *sdp, char val)
+static int
+open_wait(Sg_device *sdp, int flags)
{
- unsigned long flags;
-
- spin_lock_irqsave(&sg_open_exclusive_lock, flags);
- sdp->exclude = val;
- spin_unlock_irqrestore(&sg_open_exclusive_lock, flags);
- return val;
-}
+ int retval = 0;
-static int sfds_list_empty(Sg_device *sdp)
-{
- unsigned long flags;
- int ret;
+ 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;
+ }
+ }
- read_lock_irqsave(&sg_index_lock, flags);
- ret = list_empty(&sdp->sfds);
- read_unlock_irqrestore(&sg_index_lock, flags);
- return ret;
+ return retval;
}
+/* Returns 0 on success, else a negated errno value */
static int
sg_open(struct inode *inode, struct file *filp)
{
struct request_queue *q;
Sg_device *sdp;
Sg_fd *sfp;
- int res;
int retval;
nonseekable_open(inode, filp);
- SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
+ 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)) {
- retval = PTR_ERR(sdp);
- sdp = NULL;
- goto sg_put;
- }
+ 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 */
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;
goto error_out;
}
- if (flags & O_EXCL) {
- if (O_RDONLY == (flags & O_ACCMODE)) {
- retval = -EPERM; /* Can't lock it with read only access */
- goto error_out;
- }
- if (!sfds_list_empty(sdp) && (flags & O_NONBLOCK)) {
- retval = -EBUSY;
- goto error_out;
- }
- res = wait_event_interruptible(sdp->o_excl_wait,
- ((!sfds_list_empty(sdp) || get_exclude(sdp)) ? 0 : set_exclude(sdp, 1)));
- if (res) {
- retval = res; /* -ERESTARTSYS because signal hit process */
- goto error_out;
- }
- } else if (get_exclude(sdp)) { /* some other fd has an exclusive lock on dev */
- if (flags & O_NONBLOCK) {
- retval = -EBUSY;
- goto error_out;
- }
- res = wait_event_interruptible(sdp->o_excl_wait, !get_exclude(sdp));
- if (res) {
- retval = res; /* -ERESTARTSYS because signal hit process */
- 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;
}
- if (sdp->detached) {
- retval = -ENODEV;
- goto error_out;
- }
- if (sfds_list_empty(sdp)) { /* no existing opens on this device */
+
+ /* 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);
}
- if ((sfp = sg_add_sfp(sdp, dev)))
- filp->private_data = sfp;
- else {
- if (flags & O_EXCL) {
- set_exclude(sdp, 0); /* undo if error */
- wake_up_interruptible(&sdp->o_excl_wait);
- }
- retval = -ENOMEM;
- goto error_out;
+ 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;
-error_out:
- if (retval) {
- scsi_autopm_put_device(sdp->device);
-sdp_put:
- scsi_device_put(sdp->device);
- }
sg_put:
- if (sdp)
- sg_put_dev(sdp);
+ 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;
}
-/* Following function was formerly called 'sg_close' */
+/* 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)
{
if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
return -ENXIO;
- SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
-
- set_exclude(sdp, 0);
- wake_up_interruptible(&sdp->o_excl_wait);
+ 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;
}
if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
return -ENXIO;
- SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
- sdp->disk->disk_name, (int) count));
+ 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;
}
srp = sg_get_rq_mark(sfp, req_pack_id);
if (!srp) { /* now wait on packet to arrive */
- if (sdp->detached) {
+ if (atomic_read(&sdp->detaching)) {
retval = -ENODEV;
goto free_old_hdr;
}
goto free_old_hdr;
}
retval = wait_event_interruptible(sfp->read_wait,
- (sdp->detached ||
+ (atomic_read(&sdp->detaching) ||
(srp = sg_get_rq_mark(sfp, req_pack_id))));
- if (sdp->detached) {
+ if (atomic_read(&sdp->detaching)) {
retval = -ENODEV;
goto free_old_hdr;
}
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;
+ int err = 0, err2;
int len;
if (count < SZ_SG_IO_HDR) {
goto err_out;
}
err_out:
- err = sg_finish_rem_req(srp);
- return (0 == err) ? count : err;
+ err2 = sg_finish_rem_req(srp);
+ return err ? : err2 ? : count;
}
static ssize_t
Sg_request *srp;
struct sg_header old_hdr;
sg_io_hdr_t *hp;
- unsigned char cmnd[MAX_COMMAND_SIZE];
+ 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, printk("sg_write: %s, count=%d\n",
- sdp->disk->disk_name, (int) count));
- if (sdp->detached)
+ 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 -EIO; /* The minimum scsi command length is 6 bytes. */
if (!(srp = sg_add_request(sfp))) {
- SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
+ 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) {
- if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
- SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
- sfp->next_cmd_len = 0;
- sg_remove_request(sfp, srp);
- return -EIO;
- }
cmd_size = sfp->next_cmd_len;
sfp->next_cmd_len = 0; /* reset so only this write() effected */
} else {
if ((opcode >= 0xc0) && old_hdr.twelve_byte)
cmd_size = 12;
}
- SCSI_LOG_TIMEOUT(4, printk(
+ 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;
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)
+ 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;
int k;
Sg_request *srp;
sg_io_hdr_t *hp;
- unsigned char cmnd[MAX_COMMAND_SIZE];
+ unsigned char cmnd[SG_MAX_CDB_SIZE];
int timeout;
unsigned long ul_timeout;
sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
if (!(srp = sg_add_request(sfp))) {
- SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
+ 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;
sg_common_write(Sg_fd * sfp, Sg_request * srp,
unsigned char *cmnd, int timeout, int blocking)
{
- int k, data_dir;
+ int k, at_head;
Sg_device *sdp = sfp->parentdp;
sg_io_hdr_t *hp = &srp->header;
hp->host_status = 0;
hp->driver_status = 0;
hp->resid = 0;
- SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
- (int) cmnd[0], (int) hp->cmd_len));
+ 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, printk("sg_common_write: start_req err=%d\n", 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 (sdp->detached) {
- if (srp->bio)
+ 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;
}
- switch (hp->dxfer_direction) {
- case SG_DXFER_TO_FROM_DEV:
- case SG_DXFER_FROM_DEV:
- data_dir = DMA_FROM_DEVICE;
- break;
- case SG_DXFER_TO_DEV:
- data_dir = DMA_TO_DEVICE;
- break;
- case SG_DXFER_UNKNOWN:
- data_dir = DMA_BIDIRECTIONAL;
- break;
- default:
- data_dir = DMA_NONE;
- break;
- }
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, 1, sg_rq_end_io);
+ srp->rq, at_head, sg_rq_end_io);
return 0;
}
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)
{
if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
return -ENXIO;
- SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
- sdp->disk->disk_name, (int) cmd_in));
+ 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 (sdp->detached)
+ if (atomic_read(&sdp->detaching))
return -ENODEV;
if (!scsi_block_when_processing_errors(sdp->device))
return -ENXIO;
if (result < 0)
return result;
result = wait_event_interruptible(sfp->read_wait,
- (srp_done(sfp, srp) || sdp->detached));
- if (sdp->detached)
+ (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) {
sfp->low_dma = 1;
if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
val = (int) sfp->reserve.bufflen;
- sg_remove_scat(&sfp->reserve);
+ sg_remove_scat(sfp, &sfp->reserve);
sg_build_reserve(sfp, val);
}
} else {
- if (sdp->detached)
+ if (atomic_read(&sdp->detaching))
return -ENODEV;
sfp->low_dma = sdp->device->host->unchecked_isa_dma;
}
else {
sg_scsi_id_t __user *sg_idp = p;
- if (sdp->detached)
+ if (atomic_read(&sdp->detaching))
return -ENODEV;
__put_user((int) sdp->device->host->host_no,
&sg_idp->host_no);
if (val < 0)
return -EINVAL;
val = min_t(int, val,
- queue_max_sectors(sdp->device->request_queue) * 512);
+ 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->reserve);
+ 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,
- queue_max_sectors(sdp->device->request_queue) * 512);
+ max_sectors_bytes(sdp->device->request_queue));
return put_user(val, ip);
case SG_SET_COMMAND_Q:
result = get_user(val, ip);
return result;
}
case SG_EMULATED_HOST:
- if (sdp->detached)
+ if (atomic_read(&sdp->detaching))
return -ENODEV;
return put_user(sdp->device->host->hostt->emulated, ip);
- case SG_SCSI_RESET:
- if (sdp->detached)
- return -ENODEV;
- if (filp->f_flags & O_NONBLOCK) {
- if (scsi_host_in_recovery(sdp->device->host))
- return -EBUSY;
- } else if (!scsi_block_when_processing_errors(sdp->device))
- return -EBUSY;
- result = get_user(val, ip);
- if (result)
- return result;
- if (SG_SCSI_RESET_NOTHING == val)
- return 0;
- switch (val) {
- case SG_SCSI_RESET_DEVICE:
- val = SCSI_TRY_RESET_DEVICE;
- break;
- case SG_SCSI_RESET_TARGET:
- val = SCSI_TRY_RESET_TARGET;
- break;
- case SG_SCSI_RESET_BUS:
- val = SCSI_TRY_RESET_BUS;
- break;
- case SG_SCSI_RESET_HOST:
- val = SCSI_TRY_RESET_HOST;
- break;
- default:
- return -EINVAL;
- }
- if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
- return -EACCES;
- return (scsi_reset_provider(sdp->device, val) ==
- SUCCESS) ? 0 : -EIO;
case SCSI_IOCTL_SEND_COMMAND:
- if (sdp->detached)
+ if (atomic_read(&sdp->detaching))
return -ENODEV;
if (read_only) {
unsigned char opcode = WRITE_6;
return result;
sdp->sgdebug = (char) val;
return 0;
- case SCSI_IOCTL_GET_IDLUN:
- case SCSI_IOCTL_GET_BUS_NUMBER:
- case SCSI_IOCTL_PROBE_HOST:
- case SG_GET_TRANSFORM:
- if (sdp->detached)
- return -ENODEV;
- return scsi_ioctl(sdp->device, cmd_in, p);
case BLKSECTGET:
- return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
+ return put_user(max_sectors_bytes(sdp->device->request_queue),
ip);
case BLKTRACESETUP:
return blk_trace_setup(sdp->device->request_queue,
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 */
- return scsi_ioctl(sdp->device, cmd_in, p);
+ 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
}
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
- if (sdp->detached)
+ 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, printk("sg_poll: %s, res=0x%x\n",
- sdp->disk->disk_name, (int) res));
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+ "sg_poll: res=0x%x\n", (int) res));
return res;
}
if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
return -ENXIO;
- SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
- sdp->disk->disk_name, mode));
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+ "sg_fasync: mode=%d\n", mode));
return fasync_helper(fd, filp, mode, &sfp->async_qp);
}
offset = vmf->pgoff << PAGE_SHIFT;
if (offset >= rsv_schp->bufflen)
return VM_FAULT_SIGBUS;
- SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
- offset, rsv_schp->k_use_sg));
+ 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++) {
if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
return -ENXIO;
req_sz = vma->vm_end - vma->vm_start;
- SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
- (void *) vma->vm_start, (int) req_sz));
+ 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;
}
sfp->mmap_called = 1;
- vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
+ 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)
+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;
* 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)
+static void
+sg_rq_end_io(struct request *rq, int uptodate)
{
struct sg_request *srp = rq->end_io_data;
Sg_device *sdp;
return;
sdp = sfp->parentdp;
- if (unlikely(sdp->detached))
- printk(KERN_INFO "sg_rq_end_io: device detached\n");
+ 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, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
- sdp->disk->disk_name, srp->header.pack_id, result));
+ 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) ?
if ((sdp->sgdebug > 0) &&
((CHECK_CONDITION == srp->header.masked_status) ||
(COMMAND_TERMINATED == srp->header.masked_status)))
- __scsi_print_sense("sg_cmd_done", sense,
+ __scsi_print_sense(sdp->device, __func__, sense,
SCSI_SENSE_BUFFERSIZE);
/* Following if statement is a patch supplied by Eric Youngdale */
}
/* 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)
static int sg_sysfs_valid = 0;
-static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
+static Sg_device *
+sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
{
struct request_queue *q = scsidp->request_queue;
Sg_device *sdp;
sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
if (!sdp) {
- printk(KERN_WARNING "kmalloc Sg_device failure\n");
+ sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
+ "failure\n", __func__);
return ERR_PTR(-ENOMEM);
}
scsidp->type, SG_MAX_DEVS - 1);
error = -ENODEV;
} else {
- printk(KERN_WARNING
- "idr allocation Sg_device failure: %d\n", error);
+ sdev_printk(KERN_WARNING, scsidp, "%s: idr "
+ "allocation Sg_device failure: %d\n",
+ __func__, error);
}
goto out_unlock;
}
k = error;
- SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
+ 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->o_excl_wait);
+ 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);
}
static int
-sg_add(struct device *cl_dev, struct class_interface *cl_intf)
+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;
disk = alloc_disk(1);
if (!disk) {
- printk(KERN_WARNING "alloc_disk failed\n");
+ pr_warn("%s: alloc_disk failed\n", __func__);
return -ENOMEM;
}
disk->major = SCSI_GENERIC_MAJOR;
error = -ENOMEM;
cdev = cdev_alloc();
if (!cdev) {
- printk(KERN_WARNING "cdev_alloc failed\n");
+ pr_warn("%s: cdev_alloc failed\n", __func__);
goto out;
}
cdev->owner = THIS_MODULE;
sdp = sg_alloc(disk, scsidp);
if (IS_ERR(sdp)) {
- printk(KERN_WARNING "sg_alloc failed\n");
+ pr_warn("%s: sg_alloc failed\n", __func__);
error = PTR_ERR(sdp);
goto out;
}
sdp->index),
sdp, "%s", disk->disk_name);
if (IS_ERR(sg_class_member)) {
- printk(KERN_ERR "sg_add: "
- "device_create failed\n");
+ 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)
- printk(KERN_ERR "sg_add: unable to make symlink "
- "'generic' back to sg%d\n", sdp->index);
+ pr_err("%s: unable to make symlink 'generic' back "
+ "to sg%d\n", __func__, sdp->index);
} else
- printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
+ 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);
+ sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
+ "type %d\n", sdp->index, scsidp->type);
dev_set_drvdata(cl_dev, sdp);
return error;
}
-static void sg_device_destroy(struct kref *kref)
+static void
+sg_device_destroy(struct kref *kref)
{
struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
unsigned long flags;
write_unlock_irqrestore(&sg_index_lock, flags);
SCSI_LOG_TIMEOUT(3,
- printk("sg_device_destroy: %s\n",
- sdp->disk->disk_name));
+ sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
put_disk(sdp->disk);
kfree(sdp);
}
-static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
+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 || sdp->detached)
+ 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, printk("sg_remove: %s\n", sdp->disk->disk_name));
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+ "%s\n", __func__));
- /* Need a write lock to set sdp->detached. */
- write_lock_irqsave(&sg_index_lock, iflags);
- sdp->detached = 1;
+ read_lock_irqsave(&sdp->sfd_lock, iflags);
list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
- wake_up_interruptible(&sfp->read_wait);
+ wake_up_interruptible_all(&sfp->read_wait);
kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
}
- write_unlock_irqrestore(&sg_index_lock, iflags);
+ 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;
- sg_put_dev(sdp);
+ kref_put(&sdp->d_ref, sg_device_destroy);
}
module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
idr_destroy(&sg_index_idr);
}
-static int sg_start_req(Sg_request *srp, unsigned char *cmd)
+static int
+sg_start_req(Sg_request *srp, unsigned char *cmd)
{
int res;
struct request *rq;
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, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
- dxfer_len));
+ SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_start_req: dxfer_len=%d\n",
+ dxfer_len));
- rq = blk_get_request(q, rw, GFP_ATOMIC);
- if (!rq)
- return -ENOMEM;
+ if (hp->cmd_len > BLK_MAX_CDB) {
+ long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
+ if (!long_cmdp)
+ return -ENOMEM;
+ }
- memcpy(rq->cmd, cmd, hp->cmd_len);
+ /*
+ * 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;
- rq->cmd_type = REQ_TYPE_BLOCK_PC;
srp->rq = rq;
rq->end_io_data = srp;
}
if (iov_count) {
- int len, size = sizeof(struct sg_iovec) * iov_count;
- struct iovec *iov;
+ struct iovec *iov = NULL;
+ struct iov_iter i;
- iov = memdup_user(hp->dxferp, size);
- if (IS_ERR(iov))
- return PTR_ERR(iov);
+ res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
+ if (res < 0)
+ return res;
- len = iov_length(iov, iov_count);
- if (hp->dxfer_len < len) {
- iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
- len = hp->dxfer_len;
+ 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, (struct sg_iovec *)iov,
- iov_count,
- len, GFP_ATOMIC);
+ 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,
return res;
}
-static int sg_finish_rem_req(Sg_request * srp)
+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, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
- if (srp->rq) {
- if (srp->bio)
- ret = blk_rq_unmap_user(srp->bio);
+ 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(req_schp);
+ sg_remove_scat(sfp, req_schp);
sg_remove_request(sfp, srp);
++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, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
- buff_size, blk_size));
+ 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);
}
}
- SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
- "ret_sz=%d\n", k, num, 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, printk("sg_build_indirect: k_use_sg=%d, "
- "rem_sz=%d\n", k, rem_sz));
+ 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 */
}
static void
-sg_remove_scat(Sg_scatter_hold * schp)
+sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
{
- SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
+ 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, printk(
- "sg_remove_scat: k=%d, pg=0x%p\n",
- k, schp->pages[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);
}
Sg_scatter_hold *schp = &srp->data;
int k, num;
- SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
- num_read_xfer));
+ 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;
{
Sg_scatter_hold *schp = &sfp->reserve;
- SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
+ 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(schp);
+ sg_remove_scat(sfp, schp);
req_size >>= 1; /* divide by 2 */
} while (req_size > (PAGE_SIZE / 2));
}
int k, num, rem;
srp->res_used = 1;
- SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
+ 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);
}
if (k >= rsv_schp->k_use_sg)
- SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
+ SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_link_reserve: BAD size\n"));
}
static void
{
Sg_scatter_hold *req_schp = &srp->data;
- SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
- (int) req_schp->k_use_sg));
+ 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;
}
static Sg_fd *
-sg_add_sfp(Sg_device * sdp, int dev)
+sg_add_sfp(Sg_device * sdp)
{
Sg_fd *sfp;
unsigned long iflags;
sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
if (!sfp)
- return NULL;
+ return ERR_PTR(-ENOMEM);
init_waitqueue_head(&sfp->read_wait);
rwlock_init(&sfp->rq_list_lock);
sfp->cmd_q = SG_DEF_COMMAND_Q;
sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
sfp->parentdp = sdp;
- write_lock_irqsave(&sg_index_lock, iflags);
+ 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(&sg_index_lock, iflags);
- SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
+ 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,
- queue_max_sectors(sdp->device->request_queue) * 512);
+ max_sectors_bytes(sdp->device->request_queue));
sg_build_reserve(sfp, bufflen);
- SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
- sfp->reserve.bufflen, sfp->reserve.k_use_sg));
+ 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)
+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_finish_rem_req(sfp->headrp);
if (sfp->reserve.bufflen > 0) {
- SCSI_LOG_TIMEOUT(6,
- printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
+ 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->reserve);
+ sg_remove_scat(sfp, &sfp->reserve);
}
- SCSI_LOG_TIMEOUT(6,
- printk("sg_remove_sfp: %s, sfp=0x%p\n",
- sdp->disk->disk_name,
- sfp));
+ SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
+ "sg_remove_sfp: sfp=0x%p\n", sfp));
kfree(sfp);
scsi_device_put(sdp->device);
- sg_put_dev(sdp);
+ kref_put(&sdp->d_ref, sg_device_destroy);
module_put(THIS_MODULE);
}
-static void sg_remove_sfp(struct kref *kref)
+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(&sg_index_lock, iflags);
+ write_lock_irqsave(&sdp->sfd_lock, iflags);
list_del(&sfp->sfd_siblings);
- write_unlock_irqrestore(&sg_index_lock, iflags);
- wake_up_interruptible(&sdp->o_excl_wait);
+ write_unlock_irqrestore(&sdp->sfd_lock, iflags);
INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
schedule_work(&sfp->ew.work);
return idr_find(&sg_index_idr, dev);
}
-static Sg_device *sg_get_dev(int dev)
+static Sg_device *
+sg_get_dev(int dev)
{
struct sg_device *sdp;
unsigned long flags;
sdp = sg_lookup_dev(dev);
if (!sdp)
sdp = ERR_PTR(-ENXIO);
- else if (sdp->detached) {
- /* If sdp->detached, then the refcount may already be 0, in
+ 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);
return sdp;
}
-static void sg_put_dev(struct sg_device *sdp)
-{
- kref_put(&sdp->d_ref, sg_device_destroy);
-}
-
#ifdef CONFIG_SCSI_PROC_FS
static struct proc_dir_entry *sg_proc_sgp = NULL;
static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
{
- seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
- "online\n");
+ seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
return 0;
}
read_lock_irqsave(&sg_index_lock, iflags);
sdp = it ? sg_lookup_dev(it->index) : NULL;
- if (sdp && (scsidp = sdp->device) && (!sdp->detached))
- seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
+ 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) scsidp->device_busy,
+ (int) atomic_read(&scsidp->device_busy),
(int) scsi_device_online(scsidp));
- else
- seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
+ }
read_unlock_irqrestore(&sg_index_lock, iflags);
return 0;
}
read_lock_irqsave(&sg_index_lock, iflags);
sdp = it ? sg_lookup_dev(it->index) : NULL;
- if (sdp && (scsidp = sdp->device) && (!sdp->detached))
+ 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_printf(s, "<no active device>\n");
+ seq_puts(s, "<no active device>\n");
read_unlock_irqrestore(&sg_index_lock, iflags);
return 0;
}
else
cp = " ";
}
- seq_printf(s, cp);
+ seq_puts(s, cp);
blen = srp->data.bufflen;
usg = srp->data.k_use_sg;
- seq_printf(s, srp->done ?
- ((1 == srp->done) ? "rcv:" : "fin:")
- : "act:");
+ 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)
(int) srp->data.cmd_opcode);
}
if (0 == m)
- seq_printf(s, " No requests active\n");
+ seq_puts(s, " No requests active\n");
read_unlock(&fp->rq_list_lock);
}
}
Sg_device *sdp;
unsigned long iflags;
- if (it && (0 == it->index)) {
- seq_printf(s, "max_active_device=%d(origin 1)\n",
- (int)it->max);
- seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
- }
+ 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 (sdp && !list_empty(&sdp->sfds)) {
- struct scsi_device *scsidp = sdp->device;
-
+ 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 (sdp->detached)
- seq_printf(s, "detached pending close ");
- else
- seq_printf
- (s, "scsi%d chan=%d id=%d lun=%d em=%d",
- scsidp->host->host_no,
- scsidp->channel, scsidp->id,
- scsidp->lun,
- scsidp->host->hostt->emulated);
- seq_printf(s, " sg_tablesize=%d excl=%d\n",
- sdp->sg_tablesize, get_exclude(sdp));
+ 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;
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff