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![Linus Torvalds](/assets/img/avatar_default.png)
- Until now, dax has been disabled if media errors were found on any device. This enables the use of DAX in the presence of these errors by making all sector-aligned zeroing go through the driver. - The driver (already) has the ability to clear errors on writes that are sent through the block layer using 'DSMs' defined in ACPI 6.1. Other misc changes: - When mounting DAX filesystems, check to make sure the partition is page aligned. This is a requirement for DAX, and previously, we allowed such unaligned mounts to succeed, but subsequent reads/writes would fail. - Misc/cleanup fixes from Jan that remove unused code from DAX related to zeroing, writeback, and some size checks. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJXQ4GKAAoJEHr6Yb6juE3/zowP/iclIhgXXXMQJRUHJlePMXC8 15sGZ32JS1ak9g7vrsmNVEDNynfNtiMYdBxtUyRuj6xqgwdZvFk3F55KOCPtaeA1 +yADkgeRkTAcwzmHw9WQVEzBCqyzSisdrwtEfH817qdq9FJdH66x2Kos6i+HeAVr 5Q/e4gs7lKrjf384/QBl+wxNZOndJaQAPd2VRHQqx2A9F33v0ljdwRaUG1r4fjK2 dtmhcZCqdQyuAGXW3piTnZc5ZFc3DPqO4FkEfqkEK3lFOflK0fd8wMsAZRp/Jd0j GJsgnVSWSqG0Dz476djlG0w8t2p5Jv1g9cKChV+ZZEdFLKWHCOUFqXNj8uI8I4k5 cOEKCHyJ3IwfSHhNQqktEWrQN4T8ZXhWtuc9GuV4UZYuqJqHci6EdR/YsWsJjV+L lm/qvK4ipDS1pivxOy8KX/iN0z7Io8J9GXpStDx3g8iWjLlh4YYlbJLWeeRepo/z aPlV/QAKcHiGY6jzLExrZIyCWkzwo6O+0p1Kxerv9/7K/32HWbOodZ+tC8eD+N25 pV69nCGf+u50T2TtIx1+iann4NC1r7zg5yqnT9AgpyZpiwR5joCDzI5sXW+D0rcS vPtfM84Ccdeq/e6mvfIpZgR0/npQapKnrmUest0J7P2BFPHiFPji1KzZ7M+1aFOo 9R6JdrAj0Sc+FBa+cGzH =v6Of -----END PGP SIGNATURE----- Merge tag 'dax-misc-for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm Pull misc DAX updates from Vishal Verma: "DAX error handling for 4.7 - Until now, dax has been disabled if media errors were found on any device. This enables the use of DAX in the presence of these errors by making all sector-aligned zeroing go through the driver. - The driver (already) has the ability to clear errors on writes that are sent through the block layer using 'DSMs' defined in ACPI 6.1. Other misc changes: - When mounting DAX filesystems, check to make sure the partition is page aligned. This is a requirement for DAX, and previously, we allowed such unaligned mounts to succeed, but subsequent reads/writes would fail. - Misc/cleanup fixes from Jan that remove unused code from DAX related to zeroing, writeback, and some size checks" * tag 'dax-misc-for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: dax: fix a comment in dax_zero_page_range and dax_truncate_page dax: for truncate/hole-punch, do zeroing through the driver if possible dax: export a low-level __dax_zero_page_range helper dax: use sb_issue_zerout instead of calling dax_clear_sectors dax: enable dax in the presence of known media errors (badblocks) dax: fallback from pmd to pte on error block: Update blkdev_dax_capable() for consistency xfs: Add alignment check for DAX mount ext2: Add alignment check for DAX mount ext4: Add alignment check for DAX mount block: Add bdev_dax_supported() for dax mount checks block: Add vfs_msg() interface dax: Remove redundant inode size checks dax: Remove pointless writeback from dax_do_io() dax: Remove zeroing from dax_io() dax: Remove dead zeroing code from fault handlers ext2: Avoid DAX zeroing to corrupt data ext2: Fix block zeroing in ext2_get_blocks() for DAX dax: Remove complete_unwritten argument DAX: move RADIX_DAX_ definitions to dax.c
587 lines
15 KiB
C
587 lines
15 KiB
C
#include <linux/capability.h>
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#include <linux/blkdev.h>
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#include <linux/export.h>
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#include <linux/gfp.h>
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#include <linux/blkpg.h>
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#include <linux/hdreg.h>
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#include <linux/backing-dev.h>
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#include <linux/fs.h>
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#include <linux/blktrace_api.h>
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#include <linux/pr.h>
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#include <asm/uaccess.h>
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static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
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{
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struct block_device *bdevp;
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struct gendisk *disk;
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struct hd_struct *part, *lpart;
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struct blkpg_ioctl_arg a;
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struct blkpg_partition p;
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struct disk_part_iter piter;
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long long start, length;
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int partno;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
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return -EFAULT;
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if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
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return -EFAULT;
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disk = bdev->bd_disk;
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if (bdev != bdev->bd_contains)
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return -EINVAL;
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partno = p.pno;
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if (partno <= 0)
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return -EINVAL;
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switch (a.op) {
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case BLKPG_ADD_PARTITION:
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start = p.start >> 9;
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length = p.length >> 9;
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/* check for fit in a hd_struct */
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if (sizeof(sector_t) == sizeof(long) &&
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sizeof(long long) > sizeof(long)) {
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long pstart = start, plength = length;
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if (pstart != start || plength != length
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|| pstart < 0 || plength < 0 || partno > 65535)
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return -EINVAL;
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}
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mutex_lock(&bdev->bd_mutex);
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/* overlap? */
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disk_part_iter_init(&piter, disk,
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DISK_PITER_INCL_EMPTY);
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while ((part = disk_part_iter_next(&piter))) {
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if (!(start + length <= part->start_sect ||
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start >= part->start_sect + part->nr_sects)) {
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disk_part_iter_exit(&piter);
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mutex_unlock(&bdev->bd_mutex);
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return -EBUSY;
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}
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}
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disk_part_iter_exit(&piter);
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/* all seems OK */
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part = add_partition(disk, partno, start, length,
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ADDPART_FLAG_NONE, NULL);
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mutex_unlock(&bdev->bd_mutex);
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return PTR_ERR_OR_ZERO(part);
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case BLKPG_DEL_PARTITION:
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part = disk_get_part(disk, partno);
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if (!part)
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return -ENXIO;
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bdevp = bdget(part_devt(part));
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disk_put_part(part);
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if (!bdevp)
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return -ENOMEM;
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mutex_lock(&bdevp->bd_mutex);
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if (bdevp->bd_openers) {
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mutex_unlock(&bdevp->bd_mutex);
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bdput(bdevp);
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return -EBUSY;
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}
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/* all seems OK */
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fsync_bdev(bdevp);
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invalidate_bdev(bdevp);
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mutex_lock_nested(&bdev->bd_mutex, 1);
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delete_partition(disk, partno);
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mutex_unlock(&bdev->bd_mutex);
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mutex_unlock(&bdevp->bd_mutex);
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bdput(bdevp);
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return 0;
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case BLKPG_RESIZE_PARTITION:
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start = p.start >> 9;
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/* new length of partition in bytes */
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length = p.length >> 9;
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/* check for fit in a hd_struct */
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if (sizeof(sector_t) == sizeof(long) &&
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sizeof(long long) > sizeof(long)) {
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long pstart = start, plength = length;
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if (pstart != start || plength != length
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|| pstart < 0 || plength < 0)
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return -EINVAL;
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}
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part = disk_get_part(disk, partno);
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if (!part)
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return -ENXIO;
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bdevp = bdget(part_devt(part));
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if (!bdevp) {
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disk_put_part(part);
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return -ENOMEM;
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}
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mutex_lock(&bdevp->bd_mutex);
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mutex_lock_nested(&bdev->bd_mutex, 1);
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if (start != part->start_sect) {
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mutex_unlock(&bdevp->bd_mutex);
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mutex_unlock(&bdev->bd_mutex);
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bdput(bdevp);
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disk_put_part(part);
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return -EINVAL;
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}
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/* overlap? */
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disk_part_iter_init(&piter, disk,
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DISK_PITER_INCL_EMPTY);
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while ((lpart = disk_part_iter_next(&piter))) {
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if (lpart->partno != partno &&
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!(start + length <= lpart->start_sect ||
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start >= lpart->start_sect + lpart->nr_sects)
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) {
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disk_part_iter_exit(&piter);
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mutex_unlock(&bdevp->bd_mutex);
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mutex_unlock(&bdev->bd_mutex);
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bdput(bdevp);
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disk_put_part(part);
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return -EBUSY;
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}
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}
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disk_part_iter_exit(&piter);
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part_nr_sects_write(part, (sector_t)length);
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i_size_write(bdevp->bd_inode, p.length);
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mutex_unlock(&bdevp->bd_mutex);
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mutex_unlock(&bdev->bd_mutex);
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bdput(bdevp);
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disk_put_part(part);
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return 0;
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default:
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return -EINVAL;
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}
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}
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/*
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* This is an exported API for the block driver, and will not
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* acquire bd_mutex. This API should be used in case that
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* caller has held bd_mutex already.
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*/
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int __blkdev_reread_part(struct block_device *bdev)
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{
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struct gendisk *disk = bdev->bd_disk;
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if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
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return -EINVAL;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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lockdep_assert_held(&bdev->bd_mutex);
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return rescan_partitions(disk, bdev);
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}
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EXPORT_SYMBOL(__blkdev_reread_part);
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/*
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* This is an exported API for the block driver, and will
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* try to acquire bd_mutex. If bd_mutex has been held already
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* in current context, please call __blkdev_reread_part().
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*
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* Make sure the held locks in current context aren't required
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* in open()/close() handler and I/O path for avoiding ABBA deadlock:
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* - bd_mutex is held before calling block driver's open/close
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* handler
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* - reading partition table may submit I/O to the block device
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*/
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int blkdev_reread_part(struct block_device *bdev)
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{
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int res;
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mutex_lock(&bdev->bd_mutex);
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res = __blkdev_reread_part(bdev);
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mutex_unlock(&bdev->bd_mutex);
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return res;
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}
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EXPORT_SYMBOL(blkdev_reread_part);
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static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
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unsigned long arg, unsigned long flags)
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{
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uint64_t range[2];
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uint64_t start, len;
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if (!(mode & FMODE_WRITE))
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return -EBADF;
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if (copy_from_user(range, (void __user *)arg, sizeof(range)))
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return -EFAULT;
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start = range[0];
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len = range[1];
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if (start & 511)
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return -EINVAL;
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if (len & 511)
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return -EINVAL;
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start >>= 9;
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len >>= 9;
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if (start + len > (i_size_read(bdev->bd_inode) >> 9))
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return -EINVAL;
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return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
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}
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static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
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unsigned long arg)
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{
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uint64_t range[2];
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uint64_t start, len;
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if (!(mode & FMODE_WRITE))
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return -EBADF;
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if (copy_from_user(range, (void __user *)arg, sizeof(range)))
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return -EFAULT;
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start = range[0];
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len = range[1];
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if (start & 511)
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return -EINVAL;
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if (len & 511)
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return -EINVAL;
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start >>= 9;
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len >>= 9;
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if (start + len > (i_size_read(bdev->bd_inode) >> 9))
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return -EINVAL;
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return blkdev_issue_zeroout(bdev, start, len, GFP_KERNEL, false);
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}
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static int put_ushort(unsigned long arg, unsigned short val)
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{
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return put_user(val, (unsigned short __user *)arg);
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}
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static int put_int(unsigned long arg, int val)
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{
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return put_user(val, (int __user *)arg);
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}
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static int put_uint(unsigned long arg, unsigned int val)
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{
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return put_user(val, (unsigned int __user *)arg);
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}
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static int put_long(unsigned long arg, long val)
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{
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return put_user(val, (long __user *)arg);
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}
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static int put_ulong(unsigned long arg, unsigned long val)
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{
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return put_user(val, (unsigned long __user *)arg);
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}
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static int put_u64(unsigned long arg, u64 val)
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{
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return put_user(val, (u64 __user *)arg);
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}
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int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned cmd, unsigned long arg)
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{
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struct gendisk *disk = bdev->bd_disk;
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if (disk->fops->ioctl)
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return disk->fops->ioctl(bdev, mode, cmd, arg);
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return -ENOTTY;
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}
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/*
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* For the record: _GPL here is only because somebody decided to slap it
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* on the previous export. Sheer idiocy, since it wasn't copyrightable
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* at all and could be open-coded without any exports by anybody who cares.
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*/
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EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
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static int blkdev_pr_register(struct block_device *bdev,
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struct pr_registration __user *arg)
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{
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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struct pr_registration reg;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!ops || !ops->pr_register)
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return -EOPNOTSUPP;
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if (copy_from_user(®, arg, sizeof(reg)))
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return -EFAULT;
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if (reg.flags & ~PR_FL_IGNORE_KEY)
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return -EOPNOTSUPP;
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return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
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}
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static int blkdev_pr_reserve(struct block_device *bdev,
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struct pr_reservation __user *arg)
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{
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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struct pr_reservation rsv;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!ops || !ops->pr_reserve)
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return -EOPNOTSUPP;
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if (copy_from_user(&rsv, arg, sizeof(rsv)))
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return -EFAULT;
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if (rsv.flags & ~PR_FL_IGNORE_KEY)
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return -EOPNOTSUPP;
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return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
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}
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static int blkdev_pr_release(struct block_device *bdev,
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struct pr_reservation __user *arg)
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{
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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struct pr_reservation rsv;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!ops || !ops->pr_release)
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return -EOPNOTSUPP;
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if (copy_from_user(&rsv, arg, sizeof(rsv)))
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return -EFAULT;
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if (rsv.flags)
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return -EOPNOTSUPP;
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return ops->pr_release(bdev, rsv.key, rsv.type);
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}
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static int blkdev_pr_preempt(struct block_device *bdev,
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struct pr_preempt __user *arg, bool abort)
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{
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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struct pr_preempt p;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!ops || !ops->pr_preempt)
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return -EOPNOTSUPP;
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if (copy_from_user(&p, arg, sizeof(p)))
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return -EFAULT;
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if (p.flags)
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return -EOPNOTSUPP;
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return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
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}
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static int blkdev_pr_clear(struct block_device *bdev,
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struct pr_clear __user *arg)
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{
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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struct pr_clear c;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!ops || !ops->pr_clear)
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return -EOPNOTSUPP;
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if (copy_from_user(&c, arg, sizeof(c)))
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return -EFAULT;
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if (c.flags)
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return -EOPNOTSUPP;
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return ops->pr_clear(bdev, c.key);
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}
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/*
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* Is it an unrecognized ioctl? The correct returns are either
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* ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
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* fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
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* code before returning.
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*
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* Confused drivers sometimes return EINVAL, which is wrong. It
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* means "I understood the ioctl command, but the parameters to
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* it were wrong".
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*
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* We should aim to just fix the broken drivers, the EINVAL case
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* should go away.
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*/
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static inline int is_unrecognized_ioctl(int ret)
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{
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return ret == -EINVAL ||
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ret == -ENOTTY ||
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ret == -ENOIOCTLCMD;
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}
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static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
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unsigned cmd, unsigned long arg)
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{
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int ret;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
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if (!is_unrecognized_ioctl(ret))
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return ret;
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fsync_bdev(bdev);
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invalidate_bdev(bdev);
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return 0;
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}
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static int blkdev_roset(struct block_device *bdev, fmode_t mode,
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unsigned cmd, unsigned long arg)
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{
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int ret, n;
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ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
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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);
|