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dax fixes 4.20-rc6

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* Fix the Xarray conversion of fsdax to properly handle
 dax_lock_mapping_entry() in the presense of pmd entries.
 
 * Fix inode destruction racing a new lock request.
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Merge tag 'dax-fixes-4.20-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull dax fixes from Dan Williams:
 "The last of the known regression fixes and fallout from the Xarray
  conversion of the filesystem-dax implementation.

  On the path to debugging why the dax memory-failure injection test
  started failing after the Xarray conversion a couple more fixes for
  the dax_lock_mapping_entry(), now called dax_lock_page(), surfaced.
  Those plus the bug that started the hunt are now addressed. These
  patches have appeared in a -next release with no issues reported.

  Note the touches to mm/memory-failure.c are just the conversion to the
  new function signature for dax_lock_page().

  Summary:

   - Fix the Xarray conversion of fsdax to properly handle
     dax_lock_mapping_entry() in the presense of pmd entries

   - Fix inode destruction racing a new lock request"

* tag 'dax-fixes-4.20-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  dax: Fix unlock mismatch with updated API
  dax: Don't access a freed inode
  dax: Check page->mapping isn't NULL
This commit is contained in:
Linus Torvalds 2018-12-09 09:54:04 -08:00
commit fa82dcbf2a
3 changed files with 50 additions and 25 deletions
Download patch file Download diff file Expand all files Collapse all files

14
include/linux/dax.h
View file

@ -7,6 +7,8 @@
#include <linux/radix-tree.h>
#include <asm/pgtable.h>
typedef unsigned long dax_entry_t;
struct iomap_ops;
struct dax_device;
struct dax_operations {
@ -88,8 +90,8 @@ int dax_writeback_mapping_range(struct address_space *mapping,
struct block_device *bdev, struct writeback_control *wbc);
struct page *dax_layout_busy_page(struct address_space *mapping);
bool dax_lock_mapping_entry(struct page *page);
void dax_unlock_mapping_entry(struct page *page);
dax_entry_t dax_lock_page(struct page *page);
void dax_unlock_page(struct page *page, dax_entry_t cookie);
#else
static inline bool bdev_dax_supported(struct block_device *bdev,
int blocksize)
@ -122,14 +124,14 @@ static inline int dax_writeback_mapping_range(struct address_space *mapping,
return -EOPNOTSUPP;
}
static inline bool dax_lock_mapping_entry(struct page *page)
static inline dax_entry_t dax_lock_page(struct page *page)
{
if (IS_DAX(page->mapping->host))
return true;
return false;
return ~0UL;
return 0;
}
static inline void dax_unlock_mapping_entry(struct page *page)
static inline void dax_unlock_page(struct page *page, dax_entry_t cookie)
{
}
#endif