linux/drivers/ide/ide-gd.c

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#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/mutex.h>
#include <linux/ide.h>
#include <linux/hdreg.h>
#include <linux/dmi.h>
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>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
#define IDE_DISK_MINORS (1 << PARTN_BITS)
#else
#define IDE_DISK_MINORS 0
#endif
#include "ide-disk.h"
#include "ide-floppy.h"
#define IDE_GD_VERSION "1.18"
/* module parameters */
static DEFINE_MUTEX(ide_gd_mutex);
static unsigned long debug_mask;
module_param(debug_mask, ulong, 0644);
static DEFINE_MUTEX(ide_disk_ref_mutex);
static void ide_disk_release(struct device *);
static struct ide_disk_obj *ide_disk_get(struct gendisk *disk)
{
struct ide_disk_obj *idkp = NULL;
mutex_lock(&ide_disk_ref_mutex);
idkp = ide_drv_g(disk, ide_disk_obj);
if (idkp) {
if (ide_device_get(idkp->drive))
idkp = NULL;
else
get_device(&idkp->dev);
}
mutex_unlock(&ide_disk_ref_mutex);
return idkp;
}
static void ide_disk_put(struct ide_disk_obj *idkp)
{
ide_drive_t *drive = idkp->drive;
mutex_lock(&ide_disk_ref_mutex);
put_device(&idkp->dev);
ide_device_put(drive);
mutex_unlock(&ide_disk_ref_mutex);
}
sector_t ide_gd_capacity(ide_drive_t *drive)
{
return drive->capacity64;
}
static int ide_gd_probe(ide_drive_t *);
static void ide_gd_remove(ide_drive_t *drive)
{
struct ide_disk_obj *idkp = drive->driver_data;
struct gendisk *g = idkp->disk;
ide_proc_unregister_driver(drive, idkp->driver);
device_del(&idkp->dev);
del_gendisk(g);
drive->disk_ops->flush(drive);
mutex_lock(&ide_disk_ref_mutex);
put_device(&idkp->dev);
mutex_unlock(&ide_disk_ref_mutex);
}
static void ide_disk_release(struct device *dev)
{
struct ide_disk_obj *idkp = to_ide_drv(dev, ide_disk_obj);
ide_drive_t *drive = idkp->drive;
struct gendisk *g = idkp->disk;
drive->disk_ops = NULL;
drive->driver_data = NULL;
g->private_data = NULL;
put_disk(g);
kfree(idkp);
}
/*
* On HPA drives the capacity needs to be
* reinitialized on resume otherwise the disk
* can not be used and a hard reset is required
*/
static void ide_gd_resume(ide_drive_t *drive)
{
if (ata_id_hpa_enabled(drive->id))
(void)drive->disk_ops->get_capacity(drive);
}
static const struct dmi_system_id ide_coldreboot_table[] = {
{
/* Acer TravelMate 66x cuts power during reboot */
.ident = "Acer TravelMate 660",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 660"),
},
},
{ } /* terminate list */
};
static void ide_gd_shutdown(ide_drive_t *drive)
{
#ifdef CONFIG_ALPHA
/* On Alpha, halt(8) doesn't actually turn the machine off,
it puts you into the sort of firmware monitor. Typically,
it's used to boot another kernel image, so it's not much
different from reboot(8). Therefore, we don't need to
spin down the disk in this case, especially since Alpha
firmware doesn't handle disks in standby mode properly.
On the other hand, it's reasonably safe to turn the power
off when the shutdown process reaches the firmware prompt,
as the firmware initialization takes rather long time -
at least 10 seconds, which should be sufficient for
the disk to expire its write cache. */
if (system_state != SYSTEM_POWER_OFF) {
#else
if (system_state == SYSTEM_RESTART &&
!dmi_check_system(ide_coldreboot_table)) {
#endif
drive->disk_ops->flush(drive);
return;
}
printk(KERN_INFO "Shutdown: %s\n", drive->name);
drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND);
}
#ifdef CONFIG_IDE_PROC_FS
static ide_proc_entry_t *ide_disk_proc_entries(ide_drive_t *drive)
{
return (drive->media == ide_disk) ? ide_disk_proc : ide_floppy_proc;
}
static const struct ide_proc_devset *ide_disk_proc_devsets(ide_drive_t *drive)
{
return (drive->media == ide_disk) ? ide_disk_settings
: ide_floppy_settings;
}
#endif
static ide_startstop_t ide_gd_do_request(ide_drive_t *drive,
struct request *rq, sector_t sector)
{
return drive->disk_ops->do_request(drive, rq, sector);
}
static struct ide_driver ide_gd_driver = {
.gen_driver = {
.owner = THIS_MODULE,
.name = "ide-gd",
.bus = &ide_bus_type,
},
.probe = ide_gd_probe,
.remove = ide_gd_remove,
.resume = ide_gd_resume,
.shutdown = ide_gd_shutdown,
.version = IDE_GD_VERSION,
.do_request = ide_gd_do_request,
#ifdef CONFIG_IDE_PROC_FS
.proc_entries = ide_disk_proc_entries,
.proc_devsets = ide_disk_proc_devsets,
#endif
};
static int ide_gd_open(struct block_device *bdev, fmode_t mode)
{
struct gendisk *disk = bdev->bd_disk;
struct ide_disk_obj *idkp;
ide_drive_t *drive;
int ret = 0;
idkp = ide_disk_get(disk);
if (idkp == NULL)
return -ENXIO;
drive = idkp->drive;
ide_debug_log(IDE_DBG_FUNC, "enter");
idkp->openers++;
if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
/* Just in case */
ret = drive->disk_ops->init_media(drive, disk);
/*
* Allow O_NDELAY to open a drive without a disk, or with an
* unreadable disk, so that we can get the format capacity
* of the drive or begin the format - Sam
*/
if (ret && (mode & FMODE_NDELAY) == 0) {
ret = -EIO;
goto out_put_idkp;
}
if ((drive->dev_flags & IDE_DFLAG_WP) && (mode & FMODE_WRITE)) {
ret = -EROFS;
goto out_put_idkp;
}
/*
* Ignore the return code from door_lock,
* since the open() has already succeeded,
* and the door_lock is irrelevant at this point.
*/
drive->disk_ops->set_doorlock(drive, disk, 1);
drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
check_disk_change(bdev);
} else if (drive->dev_flags & IDE_DFLAG_FORMAT_IN_PROGRESS) {
ret = -EBUSY;
goto out_put_idkp;
}
return 0;
out_put_idkp:
idkp->openers--;
ide_disk_put(idkp);
return ret;
}
static int ide_gd_unlocked_open(struct block_device *bdev, fmode_t mode)
{
int ret;
mutex_lock(&ide_gd_mutex);
ret = ide_gd_open(bdev, mode);
mutex_unlock(&ide_gd_mutex);
return ret;
}
static void ide_gd_release(struct gendisk *disk, fmode_t mode)
{
struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
ide_drive_t *drive = idkp->drive;
ide_debug_log(IDE_DBG_FUNC, "enter");
mutex_lock(&ide_gd_mutex);
if (idkp->openers == 1)
drive->disk_ops->flush(drive);
if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
drive->disk_ops->set_doorlock(drive, disk, 0);
drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
}
idkp->openers--;
ide_disk_put(idkp);
mutex_unlock(&ide_gd_mutex);
}
static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
ide_drive_t *drive = idkp->drive;
geo->heads = drive->bios_head;
geo->sectors = drive->bios_sect;
geo->cylinders = (u16)drive->bios_cyl; /* truncate */
return 0;
}
static unsigned int ide_gd_check_events(struct gendisk *disk,
unsigned int clearing)
{
struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
ide_drive_t *drive = idkp->drive;
bool ret;
/* do not scan partitions twice if this is a removable device */
if (drive->dev_flags & IDE_DFLAG_ATTACH) {
drive->dev_flags &= ~IDE_DFLAG_ATTACH;
return 0;
}
/*
* The following is used to force revalidation on the first open on
* removeable devices, and never gets reported to userland as
* genhd->events is 0. This is intended as removeable ide disk
* can't really detect MEDIA_CHANGE events.
*/
ret = drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED;
drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
return ret ? DISK_EVENT_MEDIA_CHANGE : 0;
}
static void ide_gd_unlock_native_capacity(struct gendisk *disk)
{
struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
ide_drive_t *drive = idkp->drive;
const struct ide_disk_ops *disk_ops = drive->disk_ops;
if (disk_ops->unlock_native_capacity)
disk_ops->unlock_native_capacity(drive);
}
static int ide_gd_revalidate_disk(struct gendisk *disk)
{
struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
ide_drive_t *drive = idkp->drive;
if (ide_gd_check_events(disk, 0))
drive->disk_ops->get_capacity(drive);
set_capacity(disk, ide_gd_capacity(drive));
return 0;
}
static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
ide_drive_t *drive = idkp->drive;
return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg);
}
static const struct block_device_operations ide_gd_ops = {
.owner = THIS_MODULE,
.open = ide_gd_unlocked_open,
.release = ide_gd_release,
.ioctl = ide_gd_ioctl,
.getgeo = ide_gd_getgeo,
.check_events = ide_gd_check_events,
.unlock_native_capacity = ide_gd_unlock_native_capacity,
.revalidate_disk = ide_gd_revalidate_disk
};
static int ide_gd_probe(ide_drive_t *drive)
{
const struct ide_disk_ops *disk_ops = NULL;
struct ide_disk_obj *idkp;
struct gendisk *g;
/* strstr("foo", "") is non-NULL */
if (!strstr("ide-gd", drive->driver_req))
goto failed;
#ifdef CONFIG_IDE_GD_ATA
if (drive->media == ide_disk)
disk_ops = &ide_ata_disk_ops;
#endif
#ifdef CONFIG_IDE_GD_ATAPI
if (drive->media == ide_floppy)
disk_ops = &ide_atapi_disk_ops;
#endif
if (disk_ops == NULL)
goto failed;
if (disk_ops->check(drive, DRV_NAME) == 0) {
printk(KERN_ERR PFX "%s: not supported by this driver\n",
drive->name);
goto failed;
}
idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
if (!idkp) {
printk(KERN_ERR PFX "%s: can't allocate a disk structure\n",
drive->name);
goto failed;
}
g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif));
if (!g)
goto out_free_idkp;
ide_init_disk(g, drive);
idkp->dev.parent = &drive->gendev;
idkp->dev.release = ide_disk_release;
dev_set_name(&idkp->dev, "%s", dev_name(&drive->gendev));
if (device_register(&idkp->dev))
goto out_free_disk;
idkp->drive = drive;
idkp->driver = &ide_gd_driver;
idkp->disk = g;
g->private_data = &idkp->driver;
drive->driver_data = idkp;
drive->debug_mask = debug_mask;
drive->disk_ops = disk_ops;
disk_ops->setup(drive);
set_capacity(g, ide_gd_capacity(drive));
g->minors = IDE_DISK_MINORS;
g->driverfs_dev = &drive->gendev;
g->flags |= GENHD_FL_EXT_DEVT;
if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
g->flags = GENHD_FL_REMOVABLE;
g->fops = &ide_gd_ops;
add_disk(g);
return 0;
out_free_disk:
put_disk(g);
out_free_idkp:
kfree(idkp);
failed:
return -ENODEV;
}
static int __init ide_gd_init(void)
{
printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n");
return driver_register(&ide_gd_driver.gen_driver);
}
static void __exit ide_gd_exit(void)
{
driver_unregister(&ide_gd_driver.gen_driver);
}
MODULE_ALIAS("ide:*m-disk*");
MODULE_ALIAS("ide-disk");
MODULE_ALIAS("ide:*m-floppy*");
MODULE_ALIAS("ide-floppy");
module_init(ide_gd_init);
module_exit(ide_gd_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");