Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm fixes from Dan Williams: - A collection of crash and deadlock fixes for DAX that are also tagged for -stable. We will look to re-enable DAX pmd mappings in 4.5, but for now 4.4 and -stable should disable it by default. - A fixup to ext2 and ext4 to mirror the same warning emitted by XFS when mounting with "-o dax" * 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: block: protect rw_page against device teardown mm, dax: fix DAX deadlocks (COW fault) dax: disable pmd mappings ext2, ext4: warn when mounting with dax enabled
This commit is contained in:
commit
95803066c6
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@ -72,8 +72,6 @@ void blk_dequeue_request(struct request *rq);
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void __blk_queue_free_tags(struct request_queue *q);
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bool __blk_end_bidi_request(struct request *rq, int error,
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unsigned int nr_bytes, unsigned int bidi_bytes);
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int blk_queue_enter(struct request_queue *q, gfp_t gfp);
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void blk_queue_exit(struct request_queue *q);
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void blk_freeze_queue(struct request_queue *q);
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static inline void blk_queue_enter_live(struct request_queue *q)
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@ -46,6 +46,12 @@ config FS_DAX
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or if unsure, say N. Saying Y will increase the size of the kernel
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by about 5kB.
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config FS_DAX_PMD
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bool
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default FS_DAX
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depends on FS_DAX
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depends on BROKEN
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endif # BLOCK
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# Posix ACL utility routines
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@ -390,9 +390,17 @@ int bdev_read_page(struct block_device *bdev, sector_t sector,
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struct page *page)
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{
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const struct block_device_operations *ops = bdev->bd_disk->fops;
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int result = -EOPNOTSUPP;
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if (!ops->rw_page || bdev_get_integrity(bdev))
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return -EOPNOTSUPP;
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return ops->rw_page(bdev, sector + get_start_sect(bdev), page, READ);
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return result;
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result = blk_queue_enter(bdev->bd_queue, GFP_KERNEL);
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if (result)
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return result;
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result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, READ);
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blk_queue_exit(bdev->bd_queue);
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return result;
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}
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EXPORT_SYMBOL_GPL(bdev_read_page);
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@ -421,14 +429,20 @@ int bdev_write_page(struct block_device *bdev, sector_t sector,
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int result;
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int rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE;
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const struct block_device_operations *ops = bdev->bd_disk->fops;
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if (!ops->rw_page || bdev_get_integrity(bdev))
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return -EOPNOTSUPP;
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result = blk_queue_enter(bdev->bd_queue, GFP_KERNEL);
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if (result)
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return result;
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set_page_writeback(page);
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result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, rw);
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if (result)
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end_page_writeback(page);
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else
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unlock_page(page);
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blk_queue_exit(bdev->bd_queue);
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return result;
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}
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EXPORT_SYMBOL_GPL(bdev_write_page);
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4
fs/dax.c
4
fs/dax.c
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@ -541,6 +541,10 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
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unsigned long pfn;
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int result = 0;
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/* dax pmd mappings are broken wrt gup and fork */
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if (!IS_ENABLED(CONFIG_FS_DAX_PMD))
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return VM_FAULT_FALLBACK;
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/* Fall back to PTEs if we're going to COW */
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if (write && !(vma->vm_flags & VM_SHARED))
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return VM_FAULT_FALLBACK;
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@ -569,6 +569,8 @@ static int parse_options(char *options, struct super_block *sb)
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/* Fall through */
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case Opt_dax:
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#ifdef CONFIG_FS_DAX
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ext2_msg(sb, KERN_WARNING,
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"DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
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set_opt(sbi->s_mount_opt, DAX);
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#else
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ext2_msg(sb, KERN_INFO, "dax option not supported");
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@ -1664,8 +1664,12 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
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}
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sbi->s_jquota_fmt = m->mount_opt;
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#endif
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#ifndef CONFIG_FS_DAX
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} else if (token == Opt_dax) {
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#ifdef CONFIG_FS_DAX
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ext4_msg(sb, KERN_WARNING,
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"DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
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sbi->s_mount_opt |= m->mount_opt;
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#else
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ext4_msg(sb, KERN_INFO, "dax option not supported");
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return -1;
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#endif
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@ -794,6 +794,8 @@ extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
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extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
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struct scsi_ioctl_command __user *);
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extern int blk_queue_enter(struct request_queue *q, gfp_t gfp);
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extern void blk_queue_exit(struct request_queue *q);
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extern void blk_start_queue(struct request_queue *q);
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extern void blk_stop_queue(struct request_queue *q);
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extern void blk_sync_queue(struct request_queue *q);
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@ -3015,9 +3015,9 @@ static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma,
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} else {
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/*
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* The fault handler has no page to lock, so it holds
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* i_mmap_lock for write to protect against truncate.
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* i_mmap_lock for read to protect against truncate.
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*/
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i_mmap_unlock_write(vma->vm_file->f_mapping);
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i_mmap_unlock_read(vma->vm_file->f_mapping);
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}
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goto uncharge_out;
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}
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@ -3031,9 +3031,9 @@ static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma,
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} else {
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/*
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* The fault handler has no page to lock, so it holds
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* i_mmap_lock for write to protect against truncate.
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* i_mmap_lock for read to protect against truncate.
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*/
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i_mmap_unlock_write(vma->vm_file->f_mapping);
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i_mmap_unlock_read(vma->vm_file->f_mapping);
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}
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return ret;
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uncharge_out:
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