coredump: Ensure proper size of sparse core files

[mirror_ubuntu-bionic-kernel.git] / include / linux / dax.h

diff --git a/include/linux/dax.h b/include/linux/dax.h
index 9c6dc77040434c52a0091a6a720fd055f4c618a2..f97bcfe794724d4fb757297851fe218268d0c86b 100644 (file)
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -6,21 +6,46 @@
 #include <linux/radix-tree.h>
 #include <asm/pgtable.h>
 
-/* We use lowest available exceptional entry bit for locking */
+struct iomap_ops;
+
+/*
+ * We use lowest available bit in exceptional entry for locking, one bit for
+ * the entry size (PMD) and two more to tell us if the entry is a huge zero
+ * page (HZP) or an empty entry that is just used for locking.  In total four
+ * special bits.
+ *
+ * If the PMD bit isn't set the entry has size PAGE_SIZE, and if the HZP and
+ * EMPTY bits aren't set the entry is a normal DAX entry with a filesystem
+ * block allocation.
+ */
+#define RADIX_DAX_SHIFT        (RADIX_TREE_EXCEPTIONAL_SHIFT + 4)
 #define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT)
+#define RADIX_DAX_PMD (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 1))
+#define RADIX_DAX_HZP (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 2))
+#define RADIX_DAX_EMPTY (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 3))
+
+static inline unsigned long dax_radix_sector(void *entry)
+{
+       return (unsigned long)entry >> RADIX_DAX_SHIFT;
+}
+
+static inline void *dax_radix_locked_entry(sector_t sector, unsigned long flags)
+{
+       return (void *)(RADIX_TREE_EXCEPTIONAL_ENTRY | flags |
+                       ((unsigned long)sector << RADIX_DAX_SHIFT) |
+                       RADIX_DAX_ENTRY_LOCK);
+}
 
-ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *,
-                 get_block_t, dio_iodone_t, int flags);
-int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
-int dax_truncate_page(struct inode *, loff_t from, get_block_t);
-int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
+ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
+               struct iomap_ops *ops);
+int dax_iomap_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
+                       struct iomap_ops *ops);
 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
 void dax_wake_mapping_entry_waiter(struct address_space *mapping,
-                                  pgoff_t index, bool wake_all);
+               pgoff_t index, void *entry, bool wake_all);
 
 #ifdef CONFIG_FS_DAX
 struct page *read_dax_sector(struct block_device *bdev, sector_t n);
-void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index);
 int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
                unsigned int offset, unsigned int length);
 #else
@@ -29,12 +54,6 @@ static inline struct page *read_dax_sector(struct block_device *bdev,
 {
        return ERR_PTR(-ENXIO);
 }
-/* Shouldn't ever be called when dax is disabled. */
-static inline void dax_unlock_mapping_entry(struct address_space *mapping,
-                                           pgoff_t index)
-{
-       BUG();
-}
 static inline int __dax_zero_page_range(struct block_device *bdev,
                sector_t sector, unsigned int offset, unsigned int length)
 {
@@ -42,18 +61,28 @@ static inline int __dax_zero_page_range(struct block_device *bdev,
 }
 #endif
 
-#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
-int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
-                               unsigned int flags, get_block_t);
+#ifdef CONFIG_FS_DAX_PMD
+static inline unsigned int dax_radix_order(void *entry)
+{
+       if ((unsigned long)entry & RADIX_DAX_PMD)
+               return PMD_SHIFT - PAGE_SHIFT;
+       return 0;
+}
+int dax_iomap_pmd_fault(struct vm_area_struct *vma, unsigned long address,
+               pmd_t *pmd, unsigned int flags, struct iomap_ops *ops);
 #else
-static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
-                               pmd_t *pmd, unsigned int flags, get_block_t gb)
+static inline unsigned int dax_radix_order(void *entry)
+{
+       return 0;
+}
+static inline int dax_iomap_pmd_fault(struct vm_area_struct *vma,
+               unsigned long address, pmd_t *pmd, unsigned int flags,
+               struct iomap_ops *ops)
 {
        return VM_FAULT_FALLBACK;
 }
 #endif
 int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *);
-#define dax_mkwrite(vma, vmf, gb)      dax_fault(vma, vmf, gb)
 
 static inline bool vma_is_dax(struct vm_area_struct *vma)
 {