// SPDX-License-Identifier: GPL-2.0#include <linux/capability.h>#include <linux/compat.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 <linux/uaccess.h>#include "blk.h" static int blkpg_do_ioctl(struct block_device *bdev, struct blkpg_partition __user *upart, int op){ struct blkpg_partition p; long long start, length; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (copy_from_user(&p, upart, sizeof(struct blkpg_partition))) return -EFAULT; if (bdev != bdev->bd_contains) return -EINVAL; if (p.pno <= 0) return -EINVAL; if (op == BLKPG_DEL_PARTITION) return bdev_del_partition(bdev, p.pno); start = p.start >> SECTOR_SHIFT; length = p.length >> SECTOR_SHIFT; /* check for fit in a hd_struct */ if (sizeof(sector_t) < sizeof(long long)) { long pstart = start, plength = length; if (pstart != start || plength != length || pstart < 0 || plength < 0 || p.pno > 65535) return -EINVAL; } switch (op) { case BLKPG_ADD_PARTITION: /* check if partition is aligned to blocksize */ if (p.start & (bdev_logical_block_size(bdev) - 1)) return -EINVAL; return bdev_add_partition(bdev, p.pno, start, length); case BLKPG_RESIZE_PARTITION: return bdev_resize_partition(bdev, p.pno, start, length); default: return -EINVAL; }} static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg){ struct blkpg_partition __user *udata; int op; if (get_user(op, &arg->op) || get_user(udata, &arg->data)) return -EFAULT; return blkpg_do_ioctl(bdev, udata, op);} #ifdef CONFIG_COMPATstruct compat_blkpg_ioctl_arg { compat_int_t op; compat_int_t flags; compat_int_t datalen; compat_caddr_t data;}; static int compat_blkpg_ioctl(struct block_device *bdev, struct compat_blkpg_ioctl_arg __user *arg){ compat_caddr_t udata; int op; if (get_user(op, &arg->op) || get_user(udata, &arg->data)) return -EFAULT; return blkpg_do_ioctl(bdev, compat_ptr(udata), op);}#endif static int blkdev_reread_part(struct block_device *bdev){ int ret; if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains) return -EINVAL; if (!capable(CAP_SYS_ADMIN)) return -EACCES; mutex_lock(&bdev->bd_mutex); ret = bdev_disk_changed(bdev, false); mutex_unlock(&bdev->bd_mutex); return ret;} 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; struct request_queue *q = bdev_get_queue(bdev); struct address_space *mapping = bdev->bd_inode->i_mapping; if (!(mode & FMODE_WRITE)) return -EBADF; if (!blk_queue_discard(q)) return -EOPNOTSUPP; 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; if (start + len > i_size_read(bdev->bd_inode)) return -EINVAL; truncate_inode_pages_range(mapping, start, start + len - 1); return blkdev_issue_discard(bdev, start >> 9, len >> 9, 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, BLKDEV_ZERO_NOUNMAP);} static int put_ushort(unsigned short __user *argp, unsigned short val){ return put_user(val, argp);} static int put_int(int __user *argp, int val){ return put_user(val, argp);} static int put_uint(unsigned int __user *argp, unsigned int val){ return put_user(val, argp);} static int put_long(long __user *argp, long val){ return put_user(val, argp);} static int put_ulong(unsigned long __user *argp, unsigned long val){ return put_user(val, argp);} static int put_u64(u64 __user *argp, u64 val){ return put_user(val, argp);} #ifdef CONFIG_COMPATstatic int compat_put_long(compat_long_t __user *argp, long val){ return put_user(val, argp);} static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val){ return put_user(val, argp);}#endif 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); #ifdef CONFIG_COMPAT/* * This is the equivalent of compat_ptr_ioctl(), to be used by block * drivers that implement only commands that are completely compatible * between 32-bit and 64-bit user space */int blkdev_compat_ptr_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, (unsigned long)compat_ptr(arg)); return -ENOIOCTLCMD;}EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);#endif 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(®, 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; if (!capable(CAP_SYS_ADMIN)) return -EACCES; ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); if (!is_unrecognized_ioctl(ret)) return ret; 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;} #ifdef CONFIG_COMPATstruct compat_hd_geometry { unsigned char heads; unsigned char sectors; unsigned short cylinders; u32 start;}; static int compat_hdio_getgeo(struct block_device *bdev, struct compat_hd_geometry __user *ugeo){ struct gendisk *disk = bdev->bd_disk; struct hd_geometry geo; int ret; if (!ugeo) return -EINVAL; if (!disk->fops->getgeo) return -ENOTTY; memset(&geo, 0, sizeof(geo)); /* * We need to set the startsect first, the driver may * want to override it. */ geo.start = get_start_sect(bdev); ret = disk->fops->getgeo(bdev, &geo); if (ret) return ret; ret = copy_to_user(ugeo, &geo, 4); ret |= put_user(geo.start, &ugeo->start); if (ret) ret = -EFAULT; return ret;}#endif /* 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;} /* * Common commands that are handled the same way on native and compat * user space. Note the separate arg/argp parameters that are needed * to deal with the compat_ptr() conversion. */static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, unsigned long arg, void __user *argp){ unsigned int max_sectors; switch (cmd) { case BLKFLSBUF:Lines 1–500 of 695. Load more
// SPDX-License-Identifier: GPL-2.0 #include <linux/capability.h> #include <linux/compat.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 <linux/uaccess.h> #include "blk.h" static int blkpg_do_ioctl(struct block_device *bdev, struct blkpg_partition __user *upart, int op) { struct blkpg_partition p; long long start, length; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (copy_from_user(&p, upart, sizeof(struct blkpg_partition))) return -EFAULT; if (bdev != bdev->bd_contains) return -EINVAL; if (p.pno <= 0) return -EINVAL; if (op == BLKPG_DEL_PARTITION) return bdev_del_partition(bdev, p.pno); start = p.start >> SECTOR_SHIFT; length = p.length >> SECTOR_SHIFT; /* check for fit in a hd_struct */ if (sizeof(sector_t) < sizeof(long long)) { long pstart = start, plength = length; if (pstart != start || plength != length || pstart < 0 || plength < 0 || p.pno > 65535) return -EINVAL; } switch (op) { case BLKPG_ADD_PARTITION: /* check if partition is aligned to blocksize */ if (p.start & (bdev_logical_block_size(bdev) - 1)) return -EINVAL; return bdev_add_partition(bdev, p.pno, start, length); case BLKPG_RESIZE_PARTITION: return bdev_resize_partition(bdev, p.pno, start, length); default: return -EINVAL; } } static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg) { struct blkpg_partition __user *udata; int op; if (get_user(op, &arg->op) || get_user(udata, &arg->data)) return -EFAULT; return blkpg_do_ioctl(bdev, udata, op); } #ifdef CONFIG_COMPAT struct compat_blkpg_ioctl_arg { compat_int_t op; compat_int_t flags; compat_int_t datalen; compat_caddr_t data; }; static int compat_blkpg_ioctl(struct block_device *bdev, struct compat_blkpg_ioctl_arg __user *arg) { compat_caddr_t udata; int op; if (get_user(op, &arg->op) || get_user(udata, &arg->data)) return -EFAULT; return blkpg_do_ioctl(bdev, compat_ptr(udata), op); } #endif static int blkdev_reread_part(struct block_device *bdev) { int ret; if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains) return -EINVAL; if (!capable(CAP_SYS_ADMIN)) return -EACCES; mutex_lock(&bdev->bd_mutex); ret = bdev_disk_changed(bdev, false); mutex_unlock(&bdev->bd_mutex); return ret; } 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; struct request_queue *q = bdev_get_queue(bdev); struct address_space *mapping = bdev->bd_inode->i_mapping; if (!(mode & FMODE_WRITE)) return -EBADF; if (!blk_queue_discard(q)) return -EOPNOTSUPP; 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; if (start + len > i_size_read(bdev->bd_inode)) return -EINVAL; truncate_inode_pages_range(mapping, start, start + len - 1); return blkdev_issue_discard(bdev, start >> 9, len >> 9, 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, BLKDEV_ZERO_NOUNMAP); } static int put_ushort(unsigned short __user *argp, unsigned short val) { return put_user(val, argp); } static int put_int(int __user *argp, int val) { return put_user(val, argp); } static int put_uint(unsigned int __user *argp, unsigned int val) { return put_user(val, argp); } static int put_long(long __user *argp, long val) { return put_user(val, argp); } static int put_ulong(unsigned long __user *argp, unsigned long val) { return put_user(val, argp); } static int put_u64(u64 __user *argp, u64 val) { return put_user(val, argp); } #ifdef CONFIG_COMPAT static int compat_put_long(compat_long_t __user *argp, long val) { return put_user(val, argp); } static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val) { return put_user(val, argp); } #endif 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); #ifdef CONFIG_COMPAT /* * This is the equivalent of compat_ptr_ioctl(), to be used by block * drivers that implement only commands that are completely compatible * between 32-bit and 64-bit user space */ int blkdev_compat_ptr_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, (unsigned long)compat_ptr(arg)); return -ENOIOCTLCMD; } EXPORT_SYMBOL(blkdev_compat_ptr_ioctl); #endif 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(®, 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; if (!capable(CAP_SYS_ADMIN)) return -EACCES; ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); if (!is_unrecognized_ioctl(ret)) return ret; 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; } #ifdef CONFIG_COMPAT struct compat_hd_geometry { unsigned char heads; unsigned char sectors; unsigned short cylinders; u32 start; }; static int compat_hdio_getgeo(struct block_device *bdev, struct compat_hd_geometry __user *ugeo) { struct gendisk *disk = bdev->bd_disk; struct hd_geometry geo; int ret; if (!ugeo) return -EINVAL; if (!disk->fops->getgeo) return -ENOTTY; memset(&geo, 0, sizeof(geo)); /* * We need to set the startsect first, the driver may * want to override it. */ geo.start = get_start_sect(bdev); ret = disk->fops->getgeo(bdev, &geo); if (ret) return ret; ret = copy_to_user(ugeo, &geo, 4); ret |= put_user(geo.start, &ugeo->start); if (ret) ret = -EFAULT; return ret; } #endif /* 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; } /* * Common commands that are handled the same way on native and compat * user space. Note the separate arg/argp parameters that are needed * to deal with the compat_ptr() conversion. */ static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, unsigned long arg, void __user *argp) { unsigned int max_sectors; switch (cmd) { case BLKFLSBUF: