Commit cccbce67 authored by Dan Williams's avatar Dan Williams

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: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent a41fe02b
......@@ -55,32 +55,6 @@ static int __init init_dax_wait_table(void)
}
fs_initcall(init_dax_wait_table);
static long dax_map_atomic(struct block_device *bdev, struct blk_dax_ctl *dax)
{
struct request_queue *q = bdev->bd_queue;
long rc = -EIO;
dax->addr = ERR_PTR(-EIO);
if (blk_queue_enter(q, true) != 0)
return rc;
rc = bdev_direct_access(bdev, dax);
if (rc < 0) {
dax->addr = ERR_PTR(rc);
blk_queue_exit(q);
return rc;
}
return rc;
}
static void dax_unmap_atomic(struct block_device *bdev,
const struct blk_dax_ctl *dax)
{
if (IS_ERR(dax->addr))
return;
blk_queue_exit(bdev->bd_queue);
}
static int dax_is_pmd_entry(void *entry)
{
return (unsigned long)entry & RADIX_DAX_PMD;
......@@ -553,21 +527,30 @@ static int dax_load_hole(struct address_space *mapping, void **entry,
return ret;
}
static int copy_user_dax(struct block_device *bdev, sector_t sector, size_t size,
struct page *to, unsigned long vaddr)
static int copy_user_dax(struct block_device *bdev, struct dax_device *dax_dev,
sector_t sector, size_t size, struct page *to,
unsigned long vaddr)
{
struct blk_dax_ctl dax = {
.sector = sector,
.size = size,
};
void *vto;
if (dax_map_atomic(bdev, &dax) < 0)
return PTR_ERR(dax.addr);
void *vto, *kaddr;
pgoff_t pgoff;
pfn_t pfn;
long rc;
int id;
rc = bdev_dax_pgoff(bdev, sector, size, &pgoff);
if (rc)
return rc;
id = dax_read_lock();
rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr, &pfn);
if (rc < 0) {
dax_read_unlock(id);
return rc;
}
vto = kmap_atomic(to);
copy_user_page(vto, (void __force *)dax.addr, vaddr, to);
copy_user_page(vto, (void __force *)kaddr, vaddr, to);
kunmap_atomic(vto);
dax_unmap_atomic(bdev, &dax);
dax_read_unlock(id);
return 0;
}
......@@ -735,12 +718,16 @@ static void dax_mapping_entry_mkclean(struct address_space *mapping,
}
static int dax_writeback_one(struct block_device *bdev,
struct address_space *mapping, pgoff_t index, void *entry)
struct dax_device *dax_dev, struct address_space *mapping,
pgoff_t index, void *entry)
{
struct radix_tree_root *page_tree = &mapping->page_tree;
struct blk_dax_ctl dax;
void *entry2, **slot;
int ret = 0;
void *entry2, **slot, *kaddr;
long ret = 0, id;
sector_t sector;
pgoff_t pgoff;
size_t size;
pfn_t pfn;
/*
* A page got tagged dirty in DAX mapping? Something is seriously
......@@ -789,26 +776,29 @@ static int dax_writeback_one(struct block_device *bdev,
* 'entry'. This allows us to flush for PMD_SIZE and not have to
* worry about partial PMD writebacks.
*/
dax.sector = dax_radix_sector(entry);
dax.size = PAGE_SIZE << dax_radix_order(entry);
sector = dax_radix_sector(entry);
size = PAGE_SIZE << dax_radix_order(entry);
id = dax_read_lock();
ret = bdev_dax_pgoff(bdev, sector, size, &pgoff);
if (ret)
goto dax_unlock;
/*
* We cannot hold tree_lock while calling dax_map_atomic() because it
* eventually calls cond_resched().
* dax_direct_access() may sleep, so cannot hold tree_lock over
* its invocation.
*/
ret = dax_map_atomic(bdev, &dax);
if (ret < 0) {
put_locked_mapping_entry(mapping, index, entry);
return ret;
}
ret = dax_direct_access(dax_dev, pgoff, size / PAGE_SIZE, &kaddr, &pfn);
if (ret < 0)
goto dax_unlock;
if (WARN_ON_ONCE(ret < dax.size)) {
if (WARN_ON_ONCE(ret < size / PAGE_SIZE)) {
ret = -EIO;
goto unmap;
goto dax_unlock;
}
dax_mapping_entry_mkclean(mapping, index, pfn_t_to_pfn(dax.pfn));
wb_cache_pmem(dax.addr, dax.size);
dax_mapping_entry_mkclean(mapping, index, pfn_t_to_pfn(pfn));
wb_cache_pmem(kaddr, size);
/*
* After we have flushed the cache, we can clear the dirty tag. There
* cannot be new dirty data in the pfn after the flush has completed as
......@@ -818,8 +808,8 @@ static int dax_writeback_one(struct block_device *bdev,
spin_lock_irq(&mapping->tree_lock);
radix_tree_tag_clear(page_tree, index, PAGECACHE_TAG_DIRTY);
spin_unlock_irq(&mapping->tree_lock);
unmap:
dax_unmap_atomic(bdev, &dax);
dax_unlock:
dax_read_unlock(id);
put_locked_mapping_entry(mapping, index, entry);
return ret;
......@@ -840,6 +830,7 @@ int dax_writeback_mapping_range(struct address_space *mapping,
struct inode *inode = mapping->host;
pgoff_t start_index, end_index;
pgoff_t indices[PAGEVEC_SIZE];
struct dax_device *dax_dev;
struct pagevec pvec;
bool done = false;
int i, ret = 0;
......@@ -850,6 +841,10 @@ int dax_writeback_mapping_range(struct address_space *mapping,
if (!mapping->nrexceptional || wbc->sync_mode != WB_SYNC_ALL)
return 0;
dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
if (!dax_dev)
return -EIO;
start_index = wbc->range_start >> PAGE_SHIFT;
end_index = wbc->range_end >> PAGE_SHIFT;
......@@ -870,38 +865,49 @@ int dax_writeback_mapping_range(struct address_space *mapping,
break;
}
ret = dax_writeback_one(bdev, mapping, indices[i],
pvec.pages[i]);
if (ret < 0)
ret = dax_writeback_one(bdev, dax_dev, mapping,
indices[i], pvec.pages[i]);
if (ret < 0) {
put_dax(dax_dev);
return ret;
}
}
}
put_dax(dax_dev);
return 0;
}
EXPORT_SYMBOL_GPL(dax_writeback_mapping_range);
static int dax_insert_mapping(struct address_space *mapping,
struct block_device *bdev, sector_t sector, size_t size,
void **entryp, struct vm_area_struct *vma, struct vm_fault *vmf)
struct block_device *bdev, struct dax_device *dax_dev,
sector_t sector, size_t size, void **entryp,
struct vm_area_struct *vma, struct vm_fault *vmf)
{
unsigned long vaddr = vmf->address;
struct blk_dax_ctl dax = {
.sector = sector,
.size = size,
};
void *ret;
void *entry = *entryp;
void *ret, *kaddr;
pgoff_t pgoff;
int id, rc;
pfn_t pfn;
if (dax_map_atomic(bdev, &dax) < 0)
return PTR_ERR(dax.addr);
dax_unmap_atomic(bdev, &dax);
rc = bdev_dax_pgoff(bdev, sector, size, &pgoff);
if (rc)
return rc;
ret = dax_insert_mapping_entry(mapping, vmf, entry, dax.sector, 0);
id = dax_read_lock();
rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr, &pfn);
if (rc < 0) {
dax_read_unlock(id);
return rc;
}
dax_read_unlock(id);
ret = dax_insert_mapping_entry(mapping, vmf, entry, sector, 0);
if (IS_ERR(ret))
return PTR_ERR(ret);
*entryp = ret;
return vm_insert_mixed(vma, vaddr, dax.pfn);
return vm_insert_mixed(vma, vaddr, pfn);
}
/**
......@@ -950,24 +956,34 @@ static bool dax_range_is_aligned(struct block_device *bdev,
return true;
}
int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
unsigned int offset, unsigned int length)
int __dax_zero_page_range(struct block_device *bdev,
struct dax_device *dax_dev, sector_t sector,
unsigned int offset, unsigned int size)
{
struct blk_dax_ctl dax = {
.sector = sector,
.size = PAGE_SIZE,
};
if (dax_range_is_aligned(bdev, offset, length)) {
sector_t start_sector = dax.sector + (offset >> 9);
if (dax_range_is_aligned(bdev, offset, size)) {
sector_t start_sector = sector + (offset >> 9);
return blkdev_issue_zeroout(bdev, start_sector,
length >> 9, GFP_NOFS, true);
size >> 9, GFP_NOFS, true);
} else {
if (dax_map_atomic(bdev, &dax) < 0)
return PTR_ERR(dax.addr);
clear_pmem(dax.addr + offset, length);
dax_unmap_atomic(bdev, &dax);
pgoff_t pgoff;
long rc, id;
void *kaddr;
pfn_t pfn;
rc = bdev_dax_pgoff(bdev, sector, size, &pgoff);
if (rc)
return rc;
id = dax_read_lock();
rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr,
&pfn);
if (rc < 0) {
dax_read_unlock(id);
return rc;
}
clear_pmem(kaddr + offset, size);
dax_read_unlock(id);
}
return 0;
}
......@@ -982,9 +998,12 @@ static loff_t
dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
struct iomap *iomap)
{
struct block_device *bdev = iomap->bdev;
struct dax_device *dax_dev = iomap->dax_dev;
struct iov_iter *iter = data;
loff_t end = pos + length, done = 0;
ssize_t ret = 0;
int id;
if (iov_iter_rw(iter) == READ) {
end = min(end, i_size_read(inode));
......@@ -1009,34 +1028,42 @@ dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
(end - 1) >> PAGE_SHIFT);
}
id = dax_read_lock();
while (pos < end) {
unsigned offset = pos & (PAGE_SIZE - 1);
struct blk_dax_ctl dax = { 0 };
const size_t size = ALIGN(length + offset, PAGE_SIZE);
const sector_t sector = dax_iomap_sector(iomap, pos);
ssize_t map_len;
pgoff_t pgoff;
void *kaddr;
pfn_t pfn;
if (fatal_signal_pending(current)) {
ret = -EINTR;
break;
}
dax.sector = dax_iomap_sector(iomap, pos);
dax.size = (length + offset + PAGE_SIZE - 1) & PAGE_MASK;
map_len = dax_map_atomic(iomap->bdev, &dax);
ret = bdev_dax_pgoff(bdev, sector, size, &pgoff);
if (ret)
break;
map_len = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size),
&kaddr, &pfn);
if (map_len < 0) {
ret = map_len;
break;
}
dax.addr += offset;
map_len = PFN_PHYS(map_len);
kaddr += offset;
map_len -= offset;
if (map_len > end - pos)
map_len = end - pos;
if (iov_iter_rw(iter) == WRITE)
map_len = copy_from_iter_pmem(dax.addr, map_len, iter);
map_len = copy_from_iter_pmem(kaddr, map_len, iter);
else
map_len = copy_to_iter(dax.addr, map_len, iter);
dax_unmap_atomic(iomap->bdev, &dax);
map_len = copy_to_iter(kaddr, map_len, iter);
if (map_len <= 0) {
ret = map_len ? map_len : -EFAULT;
break;
......@@ -1046,6 +1073,7 @@ dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
length -= map_len;
done += map_len;
}
dax_read_unlock(id);
return done ? done : ret;
}
......@@ -1152,8 +1180,8 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf,
clear_user_highpage(vmf->cow_page, vaddr);
break;
case IOMAP_MAPPED:
error = copy_user_dax(iomap.bdev, sector, PAGE_SIZE,
vmf->cow_page, vaddr);
error = copy_user_dax(iomap.bdev, iomap.dax_dev,
sector, PAGE_SIZE, vmf->cow_page, vaddr);
break;
default:
WARN_ON_ONCE(1);
......@@ -1178,8 +1206,8 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf,
mem_cgroup_count_vm_event(vmf->vma->vm_mm, PGMAJFAULT);
major = VM_FAULT_MAJOR;
}
error = dax_insert_mapping(mapping, iomap.bdev, sector,
PAGE_SIZE, &entry, vmf->vma, vmf);
error = dax_insert_mapping(mapping, iomap.bdev, iomap.dax_dev,
sector, PAGE_SIZE, &entry, vmf->vma, vmf);
/* -EBUSY is fine, somebody else faulted on the same PTE */
if (error == -EBUSY)
error = 0;
......@@ -1229,41 +1257,48 @@ static int dax_pmd_insert_mapping(struct vm_fault *vmf, struct iomap *iomap,
loff_t pos, void **entryp)
{
struct address_space *mapping = vmf->vma->vm_file->f_mapping;
const sector_t sector = dax_iomap_sector(iomap, pos);
struct dax_device *dax_dev = iomap->dax_dev;
struct block_device *bdev = iomap->bdev;
struct inode *inode = mapping->host;
struct blk_dax_ctl dax = {
.sector = dax_iomap_sector(iomap, pos),
.size = PMD_SIZE,
};
long length = dax_map_atomic(bdev, &dax);
void *ret = NULL;
if (length < 0) /* dax_map_atomic() failed */
const size_t size = PMD_SIZE;
void *ret = NULL, *kaddr;
long length = 0;
pgoff_t pgoff;
pfn_t pfn;
int id;
if (bdev_dax_pgoff(bdev, sector, size, &pgoff) != 0)
goto fallback;
if (length < PMD_SIZE)
goto unmap_fallback;
if (pfn_t_to_pfn(dax.pfn) & PG_PMD_COLOUR)
goto unmap_fallback;
if (!pfn_t_devmap(dax.pfn))
goto unmap_fallback;
dax_unmap_atomic(bdev, &dax);
ret = dax_insert_mapping_entry(mapping, vmf, *entryp, dax.sector,
id = dax_read_lock();
length = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr, &pfn);
if (length < 0)
goto unlock_fallback;
length = PFN_PHYS(length);
if (length < size)
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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