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libnvdimm/dax for 4.19-rc6

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* (2) fixes for the dax error handling updates that were merged for
 v4.19-rc1. My mails to Al have been bouncing recently, so I do not have
 his ack but the uaccess change is of the trivial / obviously correct
 variety. The address_space_operations fixes a regression.
 
 * A filesystem-dax fix to correct the zero page lookup to be compatible
  with non-x86 (mips and s390) architectures.
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erge tag 'libnvdimm-fixes-4.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Dan writes:
  "libnvdimm/dax for 4.19-rc6

  * (2) fixes for the dax error handling updates that were merged for
  v4.19-rc1. My mails to Al have been bouncing recently, so I do not have
  his ack but the uaccess change is of the trivial / obviously correct
  variety. The address_space_operations fixes a regression.

  * A filesystem-dax fix to correct the zero page lookup to be compatible
   with non-x86 (mips and s390) architectures."

* tag 'libnvdimm-fixes-4.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  device-dax: Add missing address_space_operations
  uaccess: Fix is_source param for check_copy_size() in copy_to_iter_mcsafe()
  filesystem-dax: Fix use of zero page
This commit is contained in:
Greg Kroah-Hartman 2018-09-25 21:37:41 +02:00
commit a38523185b
3 changed files with 9 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/dax/device.c
View File

@ -535,6 +535,11 @@ static unsigned long dax_get_unmapped_area(struct file *filp,
return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
}
static const struct address_space_operations dev_dax_aops = {
.set_page_dirty = noop_set_page_dirty,
.invalidatepage = noop_invalidatepage,
};
static int dax_open(struct inode *inode, struct file *filp)
{
struct dax_device *dax_dev = inode_dax(inode);
@ -544,6 +549,7 @@ static int dax_open(struct inode *inode, struct file *filp)
dev_dbg(&dev_dax->dev, "trace\n");
inode->i_mapping = __dax_inode->i_mapping;
inode->i_mapping->host = __dax_inode;
inode->i_mapping->a_ops = &dev_dax_aops;
filp->f_mapping = inode->i_mapping;
filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping);
filp->private_data = dev_dax;

13
fs/dax.c
View File

@ -1120,21 +1120,12 @@ static vm_fault_t dax_load_hole(struct address_space *mapping, void *entry,
{
struct inode *inode = mapping->host;
unsigned long vaddr = vmf->address;
vm_fault_t ret = VM_FAULT_NOPAGE;
struct page *zero_page;
pfn_t pfn;
pfn_t pfn = pfn_to_pfn_t(my_zero_pfn(vaddr));
vm_fault_t ret;
zero_page = ZERO_PAGE(0);
if (unlikely(!zero_page)) {
ret = VM_FAULT_OOM;
goto out;
}
pfn = page_to_pfn_t(zero_page);
dax_insert_mapping_entry(mapping, vmf, entry, pfn, RADIX_DAX_ZERO_PAGE,
false);
ret = vmf_insert_mixed(vmf->vma, vaddr, pfn);
out:
trace_dax_load_hole(inode, vmf, ret);
return ret;
}

2
include/linux/uio.h
View File

@ -172,7 +172,7 @@ size_t copy_from_iter_flushcache(void *addr, size_t bytes, struct iov_iter *i)
static __always_inline __must_check
size_t copy_to_iter_mcsafe(void *addr, size_t bytes, struct iov_iter *i)
{
if (unlikely(!check_copy_size(addr, bytes, false)))
if (unlikely(!check_copy_size(addr, bytes, true)))
return 0;
else
return _copy_to_iter_mcsafe(addr, bytes, i);