linux/drivers/scsi/osd/osd_uld.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

571 lines
14 KiB
C

/*
* osd_uld.c - OSD Upper Layer Driver
*
* A Linux driver module that registers as a SCSI ULD and probes
* for OSD type SCSI devices.
* It's main function is to export osd devices to in-kernel users like
* osdfs and pNFS-objects-LD. It also provides one ioctl for running
* in Kernel tests.
*
* Copyright (C) 2008 Panasas Inc. All rights reserved.
*
* Authors:
* Boaz Harrosh <bharrosh@panasas.com>
* Benny Halevy <bhalevy@panasas.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Panasas company nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/namei.h>
#include <linux/cdev.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/major.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <scsi/scsi.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_ioctl.h>
#include <scsi/osd_initiator.h>
#include <scsi/osd_sec.h>
#include "osd_debug.h"
#ifndef TYPE_OSD
# define TYPE_OSD 0x11
#endif
#ifndef SCSI_OSD_MAJOR
# define SCSI_OSD_MAJOR 260
#endif
#define SCSI_OSD_MAX_MINOR 64
static const char osd_name[] = "osd";
static const char *osd_version_string = "open-osd 0.2.0";
MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
MODULE_DESCRIPTION("open-osd Upper-Layer-Driver osd.ko");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(SCSI_OSD_MAJOR);
MODULE_ALIAS_SCSI_DEVICE(TYPE_OSD);
struct osd_uld_device {
int minor;
struct device class_dev;
struct cdev cdev;
struct osd_dev od;
struct osd_dev_info odi;
struct gendisk *disk;
};
struct osd_dev_handle {
struct osd_dev od;
struct file *file;
struct osd_uld_device *oud;
} ;
static DEFINE_IDA(osd_minor_ida);
static struct class osd_uld_class = {
.owner = THIS_MODULE,
.name = "scsi_osd",
};
/*
* Char Device operations
*/
static int osd_uld_open(struct inode *inode, struct file *file)
{
struct osd_uld_device *oud = container_of(inode->i_cdev,
struct osd_uld_device, cdev);
get_device(&oud->class_dev);
/* cache osd_uld_device on file handle */
file->private_data = oud;
OSD_DEBUG("osd_uld_open %p\n", oud);
return 0;
}
static int osd_uld_release(struct inode *inode, struct file *file)
{
struct osd_uld_device *oud = file->private_data;
OSD_DEBUG("osd_uld_release %p\n", file->private_data);
file->private_data = NULL;
put_device(&oud->class_dev);
return 0;
}
/* FIXME: Only one vector for now */
unsigned g_test_ioctl;
do_test_fn *g_do_test;
int osduld_register_test(unsigned ioctl, do_test_fn *do_test)
{
if (g_test_ioctl)
return -EINVAL;
g_test_ioctl = ioctl;
g_do_test = do_test;
return 0;
}
EXPORT_SYMBOL(osduld_register_test);
void osduld_unregister_test(unsigned ioctl)
{
if (ioctl == g_test_ioctl) {
g_test_ioctl = 0;
g_do_test = NULL;
}
}
EXPORT_SYMBOL(osduld_unregister_test);
static do_test_fn *_find_ioctl(unsigned cmd)
{
if (g_test_ioctl == cmd)
return g_do_test;
else
return NULL;
}
static long osd_uld_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct osd_uld_device *oud = file->private_data;
int ret;
do_test_fn *do_test;
do_test = _find_ioctl(cmd);
if (do_test)
ret = do_test(&oud->od, cmd, arg);
else {
OSD_ERR("Unknown ioctl %d: osd_uld_device=%p\n", cmd, oud);
ret = -ENOIOCTLCMD;
}
return ret;
}
static const struct file_operations osd_fops = {
.owner = THIS_MODULE,
.open = osd_uld_open,
.release = osd_uld_release,
.unlocked_ioctl = osd_uld_ioctl,
};
struct osd_dev *osduld_path_lookup(const char *name)
{
struct osd_uld_device *oud;
struct osd_dev_handle *odh;
struct file *file;
int error;
if (!name || !*name) {
OSD_ERR("Mount with !path || !*path\n");
return ERR_PTR(-EINVAL);
}
odh = kzalloc(sizeof(*odh), GFP_KERNEL);
if (unlikely(!odh))
return ERR_PTR(-ENOMEM);
file = filp_open(name, O_RDWR, 0);
if (IS_ERR(file)) {
error = PTR_ERR(file);
goto free_od;
}
if (file->f_op != &osd_fops){
error = -EINVAL;
goto close_file;
}
oud = file->private_data;
odh->od = oud->od;
odh->file = file;
odh->oud = oud;
return &odh->od;
close_file:
fput(file);
free_od:
kfree(odh);
return ERR_PTR(error);
}
EXPORT_SYMBOL(osduld_path_lookup);
static inline bool _the_same_or_null(const u8 *a1, unsigned a1_len,
const u8 *a2, unsigned a2_len)
{
if (!a2_len) /* User string is Empty means don't care */
return true;
if (a1_len != a2_len)
return false;
return 0 == memcmp(a1, a2, a1_len);
}
struct find_oud_t {
const struct osd_dev_info *odi;
struct device *dev;
struct osd_uld_device *oud;
} ;
int _mach_odi(struct device *dev, void *find_data)
{
struct osd_uld_device *oud = container_of(dev, struct osd_uld_device,
class_dev);
struct find_oud_t *fot = find_data;
const struct osd_dev_info *odi = fot->odi;
if (_the_same_or_null(oud->odi.systemid, oud->odi.systemid_len,
odi->systemid, odi->systemid_len) &&
_the_same_or_null(oud->odi.osdname, oud->odi.osdname_len,
odi->osdname, odi->osdname_len)) {
OSD_DEBUG("found device sysid_len=%d osdname=%d\n",
odi->systemid_len, odi->osdname_len);
fot->oud = oud;
return 1;
} else {
return 0;
}
}
/* osduld_info_lookup - Loop through all devices, return the requested osd_dev.
*
* if @odi->systemid_len and/or @odi->osdname_len are zero, they act as a don't
* care. .e.g if they're both zero /dev/osd0 is returned.
*/
struct osd_dev *osduld_info_lookup(const struct osd_dev_info *odi)
{
struct find_oud_t find = {.odi = odi};
find.dev = class_find_device(&osd_uld_class, NULL, &find, _mach_odi);
if (likely(find.dev)) {
struct osd_dev_handle *odh = kzalloc(sizeof(*odh), GFP_KERNEL);
if (unlikely(!odh)) {
put_device(find.dev);
return ERR_PTR(-ENOMEM);
}
odh->od = find.oud->od;
odh->oud = find.oud;
return &odh->od;
}
return ERR_PTR(-ENODEV);
}
EXPORT_SYMBOL(osduld_info_lookup);
void osduld_put_device(struct osd_dev *od)
{
if (od && !IS_ERR(od)) {
struct osd_dev_handle *odh =
container_of(od, struct osd_dev_handle, od);
struct osd_uld_device *oud = odh->oud;
BUG_ON(od->scsi_device != oud->od.scsi_device);
/* If scsi has released the device (logout), and exofs has last
* reference on oud it will be freed by above osd_uld_release
* within fput below. But this will oops in cdev_release which
* is called after the fops->release. A get_/put_ pair makes
* sure we have a cdev for the duration of fput
*/
if (odh->file) {
get_device(&oud->class_dev);
fput(odh->file);
}
put_device(&oud->class_dev);
kfree(odh);
}
}
EXPORT_SYMBOL(osduld_put_device);
const struct osd_dev_info *osduld_device_info(struct osd_dev *od)
{
struct osd_dev_handle *odh =
container_of(od, struct osd_dev_handle, od);
return &odh->oud->odi;
}
EXPORT_SYMBOL(osduld_device_info);
bool osduld_device_same(struct osd_dev *od, const struct osd_dev_info *odi)
{
struct osd_dev_handle *odh =
container_of(od, struct osd_dev_handle, od);
struct osd_uld_device *oud = odh->oud;
return (oud->odi.systemid_len == odi->systemid_len) &&
_the_same_or_null(oud->odi.systemid, oud->odi.systemid_len,
odi->systemid, odi->systemid_len) &&
(oud->odi.osdname_len == odi->osdname_len) &&
_the_same_or_null(oud->odi.osdname, oud->odi.osdname_len,
odi->osdname, odi->osdname_len);
}
EXPORT_SYMBOL(osduld_device_same);
/*
* Scsi Device operations
*/
static int __detect_osd(struct osd_uld_device *oud)
{
struct scsi_device *scsi_device = oud->od.scsi_device;
char caps[OSD_CAP_LEN];
int error;
/* sending a test_unit_ready as first command seems to be needed
* by some targets
*/
OSD_DEBUG("start scsi_test_unit_ready %p %p %p\n",
oud, scsi_device, scsi_device->request_queue);
error = scsi_test_unit_ready(scsi_device, 10*HZ, 5, NULL);
if (error)
OSD_ERR("warning: scsi_test_unit_ready failed\n");
osd_sec_init_nosec_doall_caps(caps, &osd_root_object, false, true);
if (osd_auto_detect_ver(&oud->od, caps, &oud->odi))
return -ENODEV;
return 0;
}
static void __remove(struct device *dev)
{
struct osd_uld_device *oud = container_of(dev, struct osd_uld_device,
class_dev);
struct scsi_device *scsi_device = oud->od.scsi_device;
kfree(oud->odi.osdname);
if (oud->cdev.owner)
cdev_del(&oud->cdev);
osd_dev_fini(&oud->od);
scsi_device_put(scsi_device);
OSD_INFO("osd_remove %s\n",
oud->disk ? oud->disk->disk_name : NULL);
if (oud->disk)
put_disk(oud->disk);
ida_remove(&osd_minor_ida, oud->minor);
kfree(oud);
}
static int osd_probe(struct device *dev)
{
struct scsi_device *scsi_device = to_scsi_device(dev);
struct gendisk *disk;
struct osd_uld_device *oud;
int minor;
int error;
if (scsi_device->type != TYPE_OSD)
return -ENODEV;
do {
if (!ida_pre_get(&osd_minor_ida, GFP_KERNEL))
return -ENODEV;
error = ida_get_new(&osd_minor_ida, &minor);
} while (error == -EAGAIN);
if (error)
return error;
if (minor >= SCSI_OSD_MAX_MINOR) {
error = -EBUSY;
goto err_retract_minor;
}
error = -ENOMEM;
oud = kzalloc(sizeof(*oud), GFP_KERNEL);
if (NULL == oud)
goto err_retract_minor;
dev_set_drvdata(dev, oud);
oud->minor = minor;
/* allocate a disk and set it up */
/* FIXME: do we need this since sg has already done that */
disk = alloc_disk(1);
if (!disk) {
OSD_ERR("alloc_disk failed\n");
goto err_free_osd;
}
disk->major = SCSI_OSD_MAJOR;
disk->first_minor = oud->minor;
sprintf(disk->disk_name, "osd%d", oud->minor);
oud->disk = disk;
/* hold one more reference to the scsi_device that will get released
* in __release, in case a logout is happening while fs is mounted
*/
scsi_device_get(scsi_device);
osd_dev_init(&oud->od, scsi_device);
/* Detect the OSD Version */
error = __detect_osd(oud);
if (error) {
OSD_ERR("osd detection failed, non-compatible OSD device\n");
goto err_put_disk;
}
/* init the char-device for communication with user-mode */
cdev_init(&oud->cdev, &osd_fops);
oud->cdev.owner = THIS_MODULE;
error = cdev_add(&oud->cdev,
MKDEV(SCSI_OSD_MAJOR, oud->minor), 1);
if (error) {
OSD_ERR("cdev_add failed\n");
goto err_put_disk;
}
/* class device member */
oud->class_dev.devt = oud->cdev.dev;
oud->class_dev.class = &osd_uld_class;
oud->class_dev.parent = dev;
oud->class_dev.release = __remove;
error = dev_set_name(&oud->class_dev, disk->disk_name);
if (error) {
OSD_ERR("dev_set_name failed => %d\n", error);
goto err_put_cdev;
}
error = device_register(&oud->class_dev);
if (error) {
OSD_ERR("device_register failed => %d\n", error);
goto err_put_cdev;
}
get_device(&oud->class_dev);
OSD_INFO("osd_probe %s\n", disk->disk_name);
return 0;
err_put_cdev:
cdev_del(&oud->cdev);
err_put_disk:
scsi_device_put(scsi_device);
put_disk(disk);
err_free_osd:
dev_set_drvdata(dev, NULL);
kfree(oud);
err_retract_minor:
ida_remove(&osd_minor_ida, minor);
return error;
}
static int osd_remove(struct device *dev)
{
struct scsi_device *scsi_device = to_scsi_device(dev);
struct osd_uld_device *oud = dev_get_drvdata(dev);
if (!oud || (oud->od.scsi_device != scsi_device)) {
OSD_ERR("Half cooked osd-device %p,%p || %p!=%p",
dev, oud, oud ? oud->od.scsi_device : NULL,
scsi_device);
}
device_unregister(&oud->class_dev);
put_device(&oud->class_dev);
return 0;
}
/*
* Global driver and scsi registration
*/
static struct scsi_driver osd_driver = {
.owner = THIS_MODULE,
.gendrv = {
.name = osd_name,
.probe = osd_probe,
.remove = osd_remove,
}
};
static int __init osd_uld_init(void)
{
int err;
err = class_register(&osd_uld_class);
if (err) {
OSD_ERR("Unable to register sysfs class => %d\n", err);
return err;
}
err = register_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0),
SCSI_OSD_MAX_MINOR, osd_name);
if (err) {
OSD_ERR("Unable to register major %d for osd ULD => %d\n",
SCSI_OSD_MAJOR, err);
goto err_out;
}
err = scsi_register_driver(&osd_driver.gendrv);
if (err) {
OSD_ERR("scsi_register_driver failed => %d\n", err);
goto err_out_chrdev;
}
OSD_INFO("LOADED %s\n", osd_version_string);
return 0;
err_out_chrdev:
unregister_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0), SCSI_OSD_MAX_MINOR);
err_out:
class_unregister(&osd_uld_class);
return err;
}
static void __exit osd_uld_exit(void)
{
scsi_unregister_driver(&osd_driver.gendrv);
unregister_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0), SCSI_OSD_MAX_MINOR);
class_unregister(&osd_uld_class);
OSD_INFO("UNLOADED %s\n", osd_version_string);
}
module_init(osd_uld_init);
module_exit(osd_uld_exit);