filesystem-dax: convert to dax_direct_access()
Now that a dax_device is plumbed through all dax-capable drivers we can switch from block_device_operations to dax_operations for invoking ->direct_access. This also lets us kill off some usages of struct blk_dax_ctl on the way to its eventual removal. Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
Родитель
a41fe02b6b
Коммит
cccbce6715
271
fs/dax.c
271
fs/dax.c
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@ -55,32 +55,6 @@ static int __init init_dax_wait_table(void)
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}
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fs_initcall(init_dax_wait_table);
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static long dax_map_atomic(struct block_device *bdev, struct blk_dax_ctl *dax)
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{
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struct request_queue *q = bdev->bd_queue;
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long rc = -EIO;
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dax->addr = ERR_PTR(-EIO);
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if (blk_queue_enter(q, true) != 0)
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return rc;
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rc = bdev_direct_access(bdev, dax);
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if (rc < 0) {
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dax->addr = ERR_PTR(rc);
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blk_queue_exit(q);
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return rc;
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}
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return rc;
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}
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static void dax_unmap_atomic(struct block_device *bdev,
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const struct blk_dax_ctl *dax)
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{
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if (IS_ERR(dax->addr))
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return;
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blk_queue_exit(bdev->bd_queue);
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}
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static int dax_is_pmd_entry(void *entry)
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{
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return (unsigned long)entry & RADIX_DAX_PMD;
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@ -553,21 +527,30 @@ static int dax_load_hole(struct address_space *mapping, void **entry,
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return ret;
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}
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static int copy_user_dax(struct block_device *bdev, sector_t sector, size_t size,
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struct page *to, unsigned long vaddr)
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static int copy_user_dax(struct block_device *bdev, struct dax_device *dax_dev,
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sector_t sector, size_t size, struct page *to,
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unsigned long vaddr)
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{
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struct blk_dax_ctl dax = {
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.sector = sector,
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.size = size,
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};
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void *vto;
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void *vto, *kaddr;
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pgoff_t pgoff;
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pfn_t pfn;
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long rc;
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int id;
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if (dax_map_atomic(bdev, &dax) < 0)
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return PTR_ERR(dax.addr);
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rc = bdev_dax_pgoff(bdev, sector, size, &pgoff);
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if (rc)
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return rc;
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id = dax_read_lock();
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rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr, &pfn);
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if (rc < 0) {
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dax_read_unlock(id);
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return rc;
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}
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vto = kmap_atomic(to);
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copy_user_page(vto, (void __force *)dax.addr, vaddr, to);
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copy_user_page(vto, (void __force *)kaddr, vaddr, to);
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kunmap_atomic(vto);
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dax_unmap_atomic(bdev, &dax);
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dax_read_unlock(id);
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return 0;
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}
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@ -735,12 +718,16 @@ unlock_pte:
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}
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static int dax_writeback_one(struct block_device *bdev,
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struct address_space *mapping, pgoff_t index, void *entry)
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struct dax_device *dax_dev, struct address_space *mapping,
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pgoff_t index, void *entry)
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{
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struct radix_tree_root *page_tree = &mapping->page_tree;
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struct blk_dax_ctl dax;
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void *entry2, **slot;
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int ret = 0;
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void *entry2, **slot, *kaddr;
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long ret = 0, id;
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sector_t sector;
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pgoff_t pgoff;
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size_t size;
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pfn_t pfn;
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/*
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* A page got tagged dirty in DAX mapping? Something is seriously
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@ -789,26 +776,29 @@ static int dax_writeback_one(struct block_device *bdev,
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* 'entry'. This allows us to flush for PMD_SIZE and not have to
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* worry about partial PMD writebacks.
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*/
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dax.sector = dax_radix_sector(entry);
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dax.size = PAGE_SIZE << dax_radix_order(entry);
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sector = dax_radix_sector(entry);
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size = PAGE_SIZE << dax_radix_order(entry);
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id = dax_read_lock();
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ret = bdev_dax_pgoff(bdev, sector, size, &pgoff);
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if (ret)
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goto dax_unlock;
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/*
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* We cannot hold tree_lock while calling dax_map_atomic() because it
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* eventually calls cond_resched().
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* dax_direct_access() may sleep, so cannot hold tree_lock over
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* its invocation.
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*/
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ret = dax_map_atomic(bdev, &dax);
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if (ret < 0) {
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put_locked_mapping_entry(mapping, index, entry);
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return ret;
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}
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ret = dax_direct_access(dax_dev, pgoff, size / PAGE_SIZE, &kaddr, &pfn);
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if (ret < 0)
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goto dax_unlock;
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if (WARN_ON_ONCE(ret < dax.size)) {
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if (WARN_ON_ONCE(ret < size / PAGE_SIZE)) {
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ret = -EIO;
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goto unmap;
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goto dax_unlock;
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}
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dax_mapping_entry_mkclean(mapping, index, pfn_t_to_pfn(dax.pfn));
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wb_cache_pmem(dax.addr, dax.size);
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dax_mapping_entry_mkclean(mapping, index, pfn_t_to_pfn(pfn));
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wb_cache_pmem(kaddr, size);
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/*
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* After we have flushed the cache, we can clear the dirty tag. There
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* cannot be new dirty data in the pfn after the flush has completed as
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@ -818,8 +808,8 @@ static int dax_writeback_one(struct block_device *bdev,
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spin_lock_irq(&mapping->tree_lock);
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radix_tree_tag_clear(page_tree, index, PAGECACHE_TAG_DIRTY);
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spin_unlock_irq(&mapping->tree_lock);
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unmap:
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dax_unmap_atomic(bdev, &dax);
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dax_unlock:
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dax_read_unlock(id);
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put_locked_mapping_entry(mapping, index, entry);
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return ret;
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@ -840,6 +830,7 @@ int dax_writeback_mapping_range(struct address_space *mapping,
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struct inode *inode = mapping->host;
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pgoff_t start_index, end_index;
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pgoff_t indices[PAGEVEC_SIZE];
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struct dax_device *dax_dev;
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struct pagevec pvec;
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bool done = false;
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int i, ret = 0;
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@ -850,6 +841,10 @@ int dax_writeback_mapping_range(struct address_space *mapping,
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if (!mapping->nrexceptional || wbc->sync_mode != WB_SYNC_ALL)
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return 0;
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dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
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if (!dax_dev)
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return -EIO;
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start_index = wbc->range_start >> PAGE_SHIFT;
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end_index = wbc->range_end >> PAGE_SHIFT;
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@ -870,38 +865,49 @@ int dax_writeback_mapping_range(struct address_space *mapping,
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break;
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}
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ret = dax_writeback_one(bdev, mapping, indices[i],
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pvec.pages[i]);
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if (ret < 0)
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ret = dax_writeback_one(bdev, dax_dev, mapping,
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indices[i], pvec.pages[i]);
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if (ret < 0) {
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put_dax(dax_dev);
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return ret;
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}
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}
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}
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put_dax(dax_dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(dax_writeback_mapping_range);
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static int dax_insert_mapping(struct address_space *mapping,
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struct block_device *bdev, sector_t sector, size_t size,
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void **entryp, struct vm_area_struct *vma, struct vm_fault *vmf)
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struct block_device *bdev, struct dax_device *dax_dev,
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sector_t sector, size_t size, void **entryp,
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struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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unsigned long vaddr = vmf->address;
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struct blk_dax_ctl dax = {
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.sector = sector,
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.size = size,
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};
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void *ret;
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void *entry = *entryp;
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void *ret, *kaddr;
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pgoff_t pgoff;
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int id, rc;
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pfn_t pfn;
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if (dax_map_atomic(bdev, &dax) < 0)
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return PTR_ERR(dax.addr);
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dax_unmap_atomic(bdev, &dax);
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rc = bdev_dax_pgoff(bdev, sector, size, &pgoff);
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if (rc)
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return rc;
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ret = dax_insert_mapping_entry(mapping, vmf, entry, dax.sector, 0);
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id = dax_read_lock();
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rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr, &pfn);
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if (rc < 0) {
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dax_read_unlock(id);
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return rc;
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}
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dax_read_unlock(id);
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ret = dax_insert_mapping_entry(mapping, vmf, entry, sector, 0);
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if (IS_ERR(ret))
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return PTR_ERR(ret);
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*entryp = ret;
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return vm_insert_mixed(vma, vaddr, dax.pfn);
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return vm_insert_mixed(vma, vaddr, pfn);
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}
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/**
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@ -950,24 +956,34 @@ static bool dax_range_is_aligned(struct block_device *bdev,
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return true;
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}
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int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
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unsigned int offset, unsigned int length)
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int __dax_zero_page_range(struct block_device *bdev,
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struct dax_device *dax_dev, sector_t sector,
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unsigned int offset, unsigned int size)
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{
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struct blk_dax_ctl dax = {
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.sector = sector,
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.size = PAGE_SIZE,
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};
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if (dax_range_is_aligned(bdev, offset, length)) {
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sector_t start_sector = dax.sector + (offset >> 9);
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if (dax_range_is_aligned(bdev, offset, size)) {
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sector_t start_sector = sector + (offset >> 9);
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return blkdev_issue_zeroout(bdev, start_sector,
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length >> 9, GFP_NOFS, true);
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size >> 9, GFP_NOFS, true);
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} else {
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if (dax_map_atomic(bdev, &dax) < 0)
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return PTR_ERR(dax.addr);
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clear_pmem(dax.addr + offset, length);
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dax_unmap_atomic(bdev, &dax);
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pgoff_t pgoff;
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long rc, id;
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void *kaddr;
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pfn_t pfn;
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rc = bdev_dax_pgoff(bdev, sector, size, &pgoff);
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if (rc)
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return rc;
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id = dax_read_lock();
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rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr,
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&pfn);
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if (rc < 0) {
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dax_read_unlock(id);
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return rc;
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}
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clear_pmem(kaddr + offset, size);
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dax_read_unlock(id);
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}
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return 0;
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}
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@ -982,9 +998,12 @@ static loff_t
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dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
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struct iomap *iomap)
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{
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struct block_device *bdev = iomap->bdev;
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struct dax_device *dax_dev = iomap->dax_dev;
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struct iov_iter *iter = data;
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loff_t end = pos + length, done = 0;
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ssize_t ret = 0;
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int id;
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if (iov_iter_rw(iter) == READ) {
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end = min(end, i_size_read(inode));
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@ -1009,34 +1028,42 @@ dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
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(end - 1) >> PAGE_SHIFT);
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}
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id = dax_read_lock();
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while (pos < end) {
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unsigned offset = pos & (PAGE_SIZE - 1);
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struct blk_dax_ctl dax = { 0 };
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const size_t size = ALIGN(length + offset, PAGE_SIZE);
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const sector_t sector = dax_iomap_sector(iomap, pos);
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ssize_t map_len;
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pgoff_t pgoff;
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void *kaddr;
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pfn_t pfn;
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if (fatal_signal_pending(current)) {
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ret = -EINTR;
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break;
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}
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dax.sector = dax_iomap_sector(iomap, pos);
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dax.size = (length + offset + PAGE_SIZE - 1) & PAGE_MASK;
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map_len = dax_map_atomic(iomap->bdev, &dax);
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ret = bdev_dax_pgoff(bdev, sector, size, &pgoff);
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if (ret)
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break;
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map_len = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size),
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&kaddr, &pfn);
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if (map_len < 0) {
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ret = map_len;
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break;
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}
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dax.addr += offset;
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map_len = PFN_PHYS(map_len);
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kaddr += offset;
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map_len -= offset;
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if (map_len > end - pos)
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map_len = end - pos;
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|
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if (iov_iter_rw(iter) == WRITE)
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map_len = copy_from_iter_pmem(dax.addr, map_len, iter);
|
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map_len = copy_from_iter_pmem(kaddr, map_len, iter);
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else
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map_len = copy_to_iter(dax.addr, map_len, iter);
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dax_unmap_atomic(iomap->bdev, &dax);
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map_len = copy_to_iter(kaddr, map_len, iter);
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if (map_len <= 0) {
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ret = map_len ? map_len : -EFAULT;
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break;
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@ -1046,6 +1073,7 @@ dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
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length -= map_len;
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done += map_len;
|
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}
|
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dax_read_unlock(id);
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|
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return done ? done : ret;
|
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}
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@ -1152,8 +1180,8 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf,
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clear_user_highpage(vmf->cow_page, vaddr);
|
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break;
|
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case IOMAP_MAPPED:
|
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error = copy_user_dax(iomap.bdev, sector, PAGE_SIZE,
|
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vmf->cow_page, vaddr);
|
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error = copy_user_dax(iomap.bdev, iomap.dax_dev,
|
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sector, PAGE_SIZE, vmf->cow_page, vaddr);
|
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break;
|
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default:
|
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WARN_ON_ONCE(1);
|
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|
|
@ -1178,8 +1206,8 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf,
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mem_cgroup_count_vm_event(vmf->vma->vm_mm, PGMAJFAULT);
|
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major = VM_FAULT_MAJOR;
|
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}
|
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error = dax_insert_mapping(mapping, iomap.bdev, sector,
|
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PAGE_SIZE, &entry, vmf->vma, vmf);
|
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error = dax_insert_mapping(mapping, iomap.bdev, iomap.dax_dev,
|
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sector, PAGE_SIZE, &entry, vmf->vma, vmf);
|
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/* -EBUSY is fine, somebody else faulted on the same PTE */
|
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if (error == -EBUSY)
|
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error = 0;
|
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|
|
@ -1229,41 +1257,48 @@ static int dax_pmd_insert_mapping(struct vm_fault *vmf, struct iomap *iomap,
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loff_t pos, void **entryp)
|
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{
|
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struct address_space *mapping = vmf->vma->vm_file->f_mapping;
|
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const sector_t sector = dax_iomap_sector(iomap, pos);
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struct dax_device *dax_dev = iomap->dax_dev;
|
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struct block_device *bdev = iomap->bdev;
|
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struct inode *inode = mapping->host;
|
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struct blk_dax_ctl dax = {
|
||||
.sector = dax_iomap_sector(iomap, pos),
|
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.size = PMD_SIZE,
|
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};
|
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long length = dax_map_atomic(bdev, &dax);
|
||||
void *ret = NULL;
|
||||
const size_t size = PMD_SIZE;
|
||||
void *ret = NULL, *kaddr;
|
||||
long length = 0;
|
||||
pgoff_t pgoff;
|
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pfn_t pfn;
|
||||
int id;
|
||||
|
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if (length < 0) /* dax_map_atomic() failed */
|
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if (bdev_dax_pgoff(bdev, sector, size, &pgoff) != 0)
|
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goto fallback;
|
||||
if (length < PMD_SIZE)
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goto unmap_fallback;
|
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if (pfn_t_to_pfn(dax.pfn) & PG_PMD_COLOUR)
|
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goto unmap_fallback;
|
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if (!pfn_t_devmap(dax.pfn))
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goto unmap_fallback;
|
||||
|
||||
dax_unmap_atomic(bdev, &dax);
|
||||
id = dax_read_lock();
|
||||
length = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr, &pfn);
|
||||
if (length < 0)
|
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goto unlock_fallback;
|
||||
length = PFN_PHYS(length);
|
||||
|
||||
ret = dax_insert_mapping_entry(mapping, vmf, *entryp, dax.sector,
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if (length < size)
|
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goto unlock_fallback;
|
||||
if (pfn_t_to_pfn(pfn) & PG_PMD_COLOUR)
|
||||
goto unlock_fallback;
|
||||
if (!pfn_t_devmap(pfn))
|
||||
goto unlock_fallback;
|
||||
dax_read_unlock(id);
|
||||
|
||||
ret = dax_insert_mapping_entry(mapping, vmf, *entryp, sector,
|
||||
RADIX_DAX_PMD);
|
||||
if (IS_ERR(ret))
|
||||
goto fallback;
|
||||
*entryp = ret;
|
||||
|
||||
trace_dax_pmd_insert_mapping(inode, vmf, length, dax.pfn, ret);
|
||||
trace_dax_pmd_insert_mapping(inode, vmf, length, pfn, ret);
|
||||
return vmf_insert_pfn_pmd(vmf->vma, vmf->address, vmf->pmd,
|
||||
dax.pfn, vmf->flags & FAULT_FLAG_WRITE);
|
||||
pfn, vmf->flags & FAULT_FLAG_WRITE);
|
||||
|
||||
unmap_fallback:
|
||||
dax_unmap_atomic(bdev, &dax);
|
||||
unlock_fallback:
|
||||
dax_read_unlock(id);
|
||||
fallback:
|
||||
trace_dax_pmd_insert_mapping_fallback(inode, vmf, length,
|
||||
dax.pfn, ret);
|
||||
trace_dax_pmd_insert_mapping_fallback(inode, vmf, length, pfn, ret);
|
||||
return VM_FAULT_FALLBACK;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -360,7 +360,8 @@ static int iomap_dax_zero(loff_t pos, unsigned offset, unsigned bytes,
|
|||
sector_t sector = iomap->blkno +
|
||||
(((pos & ~(PAGE_SIZE - 1)) - iomap->offset) >> 9);
|
||||
|
||||
return __dax_zero_page_range(iomap->bdev, sector, offset, bytes);
|
||||
return __dax_zero_page_range(iomap->bdev, iomap->dax_dev, sector,
|
||||
offset, bytes);
|
||||
}
|
||||
|
||||
static loff_t
|
||||
|
|
|
|||
|
|
@ -70,11 +70,13 @@ void dax_wake_mapping_entry_waiter(struct address_space *mapping,
|
|||
pgoff_t index, void *entry, bool wake_all);
|
||||
|
||||
#ifdef CONFIG_FS_DAX
|
||||
int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
|
||||
int __dax_zero_page_range(struct block_device *bdev,
|
||||
struct dax_device *dax_dev, sector_t sector,
|
||||
unsigned int offset, unsigned int length);
|
||||
#else
|
||||
static inline int __dax_zero_page_range(struct block_device *bdev,
|
||||
sector_t sector, unsigned int offset, unsigned int length)
|
||||
struct dax_device *dax_dev, sector_t sector,
|
||||
unsigned int offset, unsigned int length)
|
||||
{
|
||||
return -ENXIO;
|
||||
}
|
||||
|
|
|
|||
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