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synced 2024-08-26 02:39:48 +00:00
![Darrick J. Wong](/assets/img/avatar_default.png)
Patch series "fallocate for block devices", v11. This is a patchset to fix page cache coherency with BLKZEROOUT and implement fallocate for block devices. The first patch is a fix to the existing BLKZEROOUT ioctl to invalidate the page cache if the zeroing command to the underlying device succeeds. Without this patch we still have the pagecache coherence bug that's been in the kernel forever. The second patch changes the internal block device functions to reject attempts to discard or zeroout that are not aligned to the logical block size. Previously, we only checked that the start/len parameters were 512-byte aligned, which caused kernel BUG_ONs for unaligned IOs to 4k-LBA devices. The third patch creates an fallocate handler for block devices, wires up the FALLOC_FL_PUNCH_HOLE flag to zeroing-discard, and connects FALLOC_FL_ZERO_RANGE to write-same so that we can have a consistent fallocate interface between files and block devices. It also allows the combination of PUNCH_HOLE and NO_HIDE_STALE to invoke non-zeroing discard. Test cases for the new block device fallocate are now in xfstests as generic/349-351. This patch (of 3): Invalidate the page cache (as a regular O_DIRECT write would do) to avoid returning stale cache contents at a later time. Link: http://lkml.kernel.org/r/147518378313.22791.16649519283678515021.stgit@birch.djwong.org Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Mike Snitzer <snitzer@redhat.com> Cc: Brian Foster <bfoster@redhat.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
593 lines
15 KiB
C
593 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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struct address_space *mapping;
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uint64_t start, end, 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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end = start + len - 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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if (end >= (uint64_t)i_size_read(bdev->bd_inode))
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return -EINVAL;
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if (end < start)
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return -EINVAL;
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/* Invalidate the page cache, including dirty pages */
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mapping = bdev->bd_inode->i_mapping;
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truncate_inode_pages_range(mapping, start, end);
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return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
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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))
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return ret;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (get_user(n, (int __user *)arg))
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return -EFAULT;
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set_device_ro(bdev, n);
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return 0;
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}
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static int blkdev_getgeo(struct block_device *bdev,
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struct hd_geometry __user *argp)
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{
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struct gendisk *disk = bdev->bd_disk;
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struct hd_geometry geo;
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int ret;
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if (!argp)
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return -EINVAL;
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if (!disk->fops->getgeo)
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return -ENOTTY;
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/*
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* We need to set the startsect first, the driver may
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* want to override it.
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*/
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memset(&geo, 0, sizeof(geo));
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geo.start = get_start_sect(bdev);
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ret = disk->fops->getgeo(bdev, &geo);
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if (ret)
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return ret;
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if (copy_to_user(argp, &geo, sizeof(geo)))
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return -EFAULT;
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return 0;
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}
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/* set the logical block size */
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static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
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int __user *argp)
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{
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int ret, n;
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if (!capable(CAP_SYS_ADMIN))
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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);
|