litmus-rt.git - The LITMUS^RT kernel.

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author	Tejun Heo <htejun@gmail.com>	2007-08-06 05:36:22 -0400
committer	Jeff Garzik <jeff@garzik.org>	2007-10-12 14:55:30 -0400
commit	9af5c9c97dc9d599281778864c72b385f0c63341 (patch)
tree	8359986bd42c4a9a5b1993078aa9ee4c7971ac3d /include/asm-m32r/cacheflush.h
parent	640fdb504941fa2b9f6f274716fc9f97f2bf6bff (diff)

libata-link: introduce ata_link

Introduce ata_link. It abstracts PHY and sits between ata_port and ata_device. This new level of abstraction is necessary to support SATA Port Multiplier, which basically adds a bunch of links (PHYs) to a ATA host port. Fields related to command execution, spd_limit and EH are per-link and thus moved to ata_link. This patch only defines the host link. Multiple link handling will be added later. Also, a lot of ap->link derefences are added but many of them will be removed as each part is converted to deal directly with ata_link instead of ata_port. This patch introduces no behavior change. Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: James Bottomley <James.Bottomley@SteelEye.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>

Diffstat (limited to 'include/asm-m32r/cacheflush.h')

0 files changed, 0 insertions, 0 deletions

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#include <linux/capability.h> #include <linux/blkdev.h> #include <linux/export.h> #include <linux/gfp.h> #include <linux/blkpg.h> #include <linux/hdreg.h> #include <linux/backing-dev.h> #include <linux/fs.h> #include <linux/blktrace_api.h> #include <linux/pr.h> #include <asm/uaccess.h> static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg) { struct block_device *bdevp; struct gendisk *disk; struct hd_struct *part, *lpart; struct blkpg_ioctl_arg a; struct blkpg_partition p; struct disk_part_iter piter; long long start, length; int partno; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) return -EFAULT; if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) return -EFAULT; disk = bdev->bd_disk; if (bdev != bdev->bd_contains) return -EINVAL; partno = p.pno; if (partno <= 0) return -EINVAL; switch (a.op) { case BLKPG_ADD_PARTITION: start = p.start >> 9; length = p.length >> 9; /* check for fit in a hd_struct */ if (sizeof(sector_t) == sizeof(long) && sizeof(long long) > sizeof(long)) { long pstart = start, plength = length; if (pstart != start || plength != length || pstart < 0 || plength < 0 || partno > 65535) return -EINVAL; } mutex_lock(&bdev->bd_mutex); /* overlap? */ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); while ((part = disk_part_iter_next(&piter))) { if (!(start + length <= part->start_sect || start >= part->start_sect + part->nr_sects)) { disk_part_iter_exit(&piter); mutex_unlock(&bdev->bd_mutex); return -EBUSY; } } disk_part_iter_exit(&piter); /* all seems OK */ part = add_partition(disk, partno, start, length, ADDPART_FLAG_NONE, NULL); mutex_unlock(&bdev->bd_mutex); return PTR_ERR_OR_ZERO(part); case BLKPG_DEL_PARTITION: part = disk_get_part(disk, partno); if (!part) return -ENXIO; bdevp = bdget(part_devt(part)); disk_put_part(part); if (!bdevp) return -ENOMEM; mutex_lock(&bdevp->bd_mutex); if (bdevp->bd_openers) { mutex_unlock(&bdevp->bd_mutex); bdput(bdevp); return -EBUSY; } /* all seems OK */ fsync_bdev(bdevp); invalidate_bdev(bdevp); mutex_lock_nested(&bdev->bd_mutex, 1); delete_partition(disk, partno); mutex_unlock(&bdev->bd_mutex); mutex_unlock(&bdevp->bd_mutex); bdput(bdevp); return 0; case BLKPG_RESIZE_PARTITION: start = p.start >> 9; /* new length of partition in bytes */ length = p.length >> 9; /* check for fit in a hd_struct */ if (sizeof(sector_t) == sizeof(long) && sizeof(long long) > sizeof(long)) { long pstart = start, plength = length; if (pstart != start || plength != length || pstart < 0 || plength < 0) return -EINVAL; } part = disk_get_part(disk, partno); if (!part) return -ENXIO; bdevp = bdget(part_devt(part)); if (!bdevp) { disk_put_part(part); return -ENOMEM; } mutex_lock(&bdevp->bd_mutex); mutex_lock_nested(&bdev->bd_mutex, 1); if (start != part->start_sect) { mutex_unlock(&bdevp->bd_mutex); mutex_unlock(&bdev->bd_mutex); bdput(bdevp); disk_put_part(part); return -EINVAL; } /* overlap? */ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); while ((lpart = disk_part_iter_next(&piter))) { if (lpart->partno != partno && !(start + length <= lpart->start_sect || start >= lpart->start_sect + lpart->nr_sects) ) { disk_part_iter_exit(&piter); mutex_unlock(&bdevp->bd_mutex); mutex_unlock(&bdev->bd_mutex); bdput(bdevp); disk_put_part(part); return -EBUSY; } } disk_part_iter_exit(&piter); part_nr_sects_write(part, (sector_t)length); i_size_write(bdevp->bd_inode, p.length); mutex_unlock(&bdevp->bd_mutex); mutex_unlock(&bdev->bd_mutex); bdput(bdevp); disk_put_part(part); return 0; default: return -EINVAL; } } /* * This is an exported API for the block driver, and will not * acquire bd_mutex. This API should be used in case that * caller has held bd_mutex already. */ int __blkdev_reread_part(struct block_device *bdev) { struct gendisk *disk = bdev->bd_disk; if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains) return -EINVAL; if (!capable(CAP_SYS_ADMIN)) return -EACCES; lockdep_assert_held(&bdev->bd_mutex); return rescan_partitions(disk, bdev); } EXPORT_SYMBOL(__blkdev_reread_part); /* * This is an exported API for the block driver, and will * try to acquire bd_mutex. If bd_mutex has been held already * in current context, please call __blkdev_reread_part(). * * Make sure the held locks in current context aren't required * in open()/close() handler and I/O path for avoiding ABBA deadlock: * - bd_mutex is held before calling block driver's open/close * handler * - reading partition table may submit I/O to the block device */ int blkdev_reread_part(struct block_device *bdev) { int res; mutex_lock(&bdev->bd_mutex); res = __blkdev_reread_part(bdev); mutex_unlock(&bdev->bd_mutex); return res; } EXPORT_SYMBOL(blkdev_reread_part); static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, unsigned long arg, unsigned long flags) { uint64_t range[2]; uint64_t start, len; if (!(mode & FMODE_WRITE)) return -EBADF; if (copy_from_user(range, (void __user *)arg, sizeof(range))) return -EFAULT; start = range[0]; len = range[1]; if (start & 511) return -EINVAL; if (len & 511) return -EINVAL; start >>= 9; len >>= 9; if (start + len > (i_size_read(bdev->bd_inode) >> 9)) return -EINVAL; return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags); } static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, unsigned long arg) { uint64_t range[2]; struct address_space *mapping; uint64_t start, end, len; if (!(mode & FMODE_WRITE)) return -EBADF; if (copy_from_user(range, (void __user *)arg, sizeof(range))) return -EFAULT; start = range[0]; len = range[1]; end = start + len - 1; if (start & 511) return -EINVAL; if (len & 511) return -EINVAL; if (end >= (uint64_t)i_size_read(bdev->bd_inode)) return -EINVAL; if (end < start) return -EINVAL; /* Invalidate the page cache, including dirty pages */ mapping = bdev->bd_inode->i_mapping; truncate_inode_pages_range(mapping, start, end); return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, false); } static int put_ushort(unsigned long arg, unsigned short val) { return put_user(val, (unsigned short __user *)arg); } static int put_int(unsigned long arg, int val) { return put_user(val, (int __user *)arg); } static int put_uint(unsigned long arg, unsigned int val) { return put_user(val, (unsigned int __user *)arg); } static int put_long(unsigned long arg, long val) { return put_user(val, (long __user *)arg); } static int put_ulong(unsigned long arg, unsigned long val) { return put_user(val, (unsigned long __user *)arg); } static int put_u64(unsigned long arg, u64 val) { return put_user(val, (u64 __user *)arg); } int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, unsigned long arg) { struct gendisk *disk = bdev->bd_disk; if (disk->fops->ioctl) return disk->fops->ioctl(bdev, mode, cmd, arg); return -ENOTTY; } /* * For the record: _GPL here is only because somebody decided to slap it * on the previous export. Sheer idiocy, since it wasn't copyrightable * at all and could be open-coded without any exports by anybody who cares. */ EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); static int blkdev_pr_register(struct block_device *bdev, struct pr_registration __user *arg) { const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; struct pr_registration reg; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!ops || !ops->pr_register) return -EOPNOTSUPP; if (copy_from_user(&reg, arg, sizeof(reg))) return -EFAULT; if (reg.flags & ~PR_FL_IGNORE_KEY) return -EOPNOTSUPP; return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); } static int blkdev_pr_reserve(struct block_device *bdev, struct pr_reservation __user *arg) { const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; struct pr_reservation rsv; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!ops || !ops->pr_reserve) return -EOPNOTSUPP; if (copy_from_user(&rsv, arg, sizeof(rsv))) return -EFAULT; if (rsv.flags & ~PR_FL_IGNORE_KEY) return -EOPNOTSUPP; return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); } static int blkdev_pr_release(struct block_device *bdev, struct pr_reservation __user *arg) { const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; struct pr_reservation rsv; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!ops || !ops->pr_release) return -EOPNOTSUPP; if (copy_from_user(&rsv, arg, sizeof(rsv))) return -EFAULT; if (rsv.flags) return -EOPNOTSUPP; return ops->pr_release(bdev, rsv.key, rsv.type); } static int blkdev_pr_preempt(struct block_device *bdev, struct pr_preempt __user *arg, bool abort) { const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; struct pr_preempt p; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!ops || !ops->pr_preempt) return -EOPNOTSUPP; if (copy_from_user(&p, arg, sizeof(p))) return -EFAULT; if (p.flags) return -EOPNOTSUPP; return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); } static int blkdev_pr_clear(struct block_device *bdev, struct pr_clear __user *arg) { const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; struct pr_clear c; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!ops || !ops->pr_clear) return -EOPNOTSUPP; if (copy_from_user(&c, arg, sizeof(c))) return -EFAULT; if (c.flags) return -EOPNOTSUPP; return ops->pr_clear(bdev, c.key); } /* * Is it an unrecognized ioctl? The correct returns are either * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl * code before returning. * * Confused drivers sometimes return EINVAL, which is wrong. It * means "I understood the ioctl command, but the parameters to * it were wrong". * * We should aim to just fix the broken drivers, the EINVAL case * should go away. */ static inline int is_unrecognized_ioctl(int ret) { return ret == -EINVAL || ret == -ENOTTY || ret == -ENOIOCTLCMD; } static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode, unsigned cmd, unsigned long arg) { int ret; if (!capable(CAP_SYS_ADMIN)) return -EACCES; ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); if (!is_unrecognized_ioctl(ret)) return ret; fsync_bdev(bdev); invalidate_bdev(bdev); return 0; } static int blkdev_roset(struct block_device *bdev, fmode_t mode, unsigned cmd, unsigned long arg) { int ret, n; ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); if (!is_unrecognized_ioctl(ret)) return ret; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (get_user(n, (int __user *)arg)) return -EFAULT; set_device_ro(bdev, n); return 0; } static int blkdev_getgeo(struct block_device *bdev, struct hd_geometry __user *argp) { struct gendisk *disk = bdev->bd_disk; struct hd_geometry geo; int ret; if (!argp) return -EINVAL; if (!disk->fops->getgeo) return -ENOTTY; /* * We need to set the startsect first, the driver may * want to override it. */ memset(&geo, 0, sizeof(geo)); geo.start = get_start_sect(bdev); ret = disk->fops->getgeo(bdev, &geo); if (ret) return ret; if (copy_to_user(argp, &geo, sizeof(geo))) return -EFAULT; return 0; } /* set the logical block size */ static int blkdev_bszset(struct block_device *bdev, fmode_t mode, int __user *argp) { int ret, n; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (!argp) return -EINVAL; if (get_user(n, argp)) return -EFAULT; if (!(mode & FMODE_EXCL)) { bdgrab(bdev); if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0) return -EBUSY; } ret = set_blocksize(bdev, n); if (!(mode & FMODE_EXCL)) blkdev_put(bdev, mode | FMODE_EXCL); return ret; } /* * always keep this in sync with compat_blkdev_ioctl() */ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, unsigned long arg) { struct backing_dev_info *bdi; void __user *argp = (void __user *)arg; loff_t size; unsigned int max_sectors; switch (cmd) { case BLKFLSBUF: return blkdev_flushbuf(bdev, mode, cmd, arg); case BLKROSET: return blkdev_roset(bdev, mode, cmd, arg); case BLKDISCARD: return blk_ioctl_discard(bdev, mode, arg, 0); case BLKSECDISCARD: return blk_ioctl_discard(bdev, mode, arg, BLKDEV_DISCARD_SECURE); case BLKZEROOUT: return blk_ioctl_zeroout(bdev, mode, arg); case HDIO_GETGEO: return blkdev_getgeo(bdev, argp); case BLKRAGET: case BLKFRAGET: if (!arg) return -EINVAL; bdi = blk_get_backing_dev_info(bdev); return put_long(arg, (bdi->ra_pages * PAGE_SIZE) / 512); case BLKROGET: return put_int(arg, bdev_read_only(bdev) != 0); case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ return put_int(arg, block_size(bdev)); case BLKSSZGET: /* get block device logical block size */ return put_int(arg, bdev_logical_block_size(bdev)); case BLKPBSZGET: /* get block device physical block size */ return put_uint(arg, bdev_physical_block_size(bdev)); case BLKIOMIN: return put_uint(arg, bdev_io_min(bdev)); case BLKIOOPT: return put_uint(arg, bdev_io_opt(bdev)); case BLKALIGNOFF: return put_int(arg, bdev_alignment_offset(bdev)); case BLKDISCARDZEROES: return put_uint(arg, bdev_discard_zeroes_data(bdev)); case BLKSECTGET: max_sectors = min_t(unsigned int, USHRT_MAX, queue_max_sectors(bdev_get_queue(bdev))); return put_ushort(arg, max_sectors); case BLKROTATIONAL: return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev))); case BLKRASET: case BLKFRASET: if(!capable(CAP_SYS_ADMIN)) return -EACCES; bdi = blk_get_backing_dev_info(bdev); bdi->ra_pages = (arg * 512) / PAGE_SIZE; return 0; case BLKBSZSET: return blkdev_bszset(bdev, mode, argp); case BLKPG: return blkpg_ioctl(bdev, argp); case BLKRRPART: return blkdev_reread_part(bdev); case BLKGETSIZE: size = i_size_read(bdev->bd_inode); if ((size >> 9) > ~0UL) return -EFBIG; return put_ulong(arg, size >> 9); case BLKGETSIZE64: return put_u64(arg, i_size_read(bdev->bd_inode)); case BLKTRACESTART: case BLKTRACESTOP: case BLKTRACESETUP: case BLKTRACETEARDOWN: return blk_trace_ioctl(bdev, cmd, argp); case IOC_PR_REGISTER: return blkdev_pr_register(bdev, argp); case IOC_PR_RESERVE: return blkdev_pr_reserve(bdev, argp); case IOC_PR_RELEASE: return blkdev_pr_release(bdev, argp); case IOC_PR_PREEMPT: return blkdev_pr_preempt(bdev, argp, false); case IOC_PR_PREEMPT_ABORT: return blkdev_pr_preempt(bdev, argp, true); case IOC_PR_CLEAR: return blkdev_pr_clear(bdev, argp); default: return __blkdev_driver_ioctl(bdev, mode, cmd, arg); } } EXPORT_SYMBOL_GPL(blkdev_ioctl);


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