Merge branch 'akpm' (patches from Andrew)

Merge fifth set of updates from Andrew Morton:

 - A few things which were awaiting merges from linux-next:
     - rtc
     - ocfs2
     - misc others

 - Willy's "dax" feature: direct fs access to memory (mainly NV-DIMMs)
   which isn't backed by pageframes.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (37 commits)
  rtc: add driver for DS1685 family of real time clocks
  MAINTAINERS: add entry for Maxim PMICs on Samsung boards
  lib/Kconfig: use bool instead of boolean
  powerpc: drop _PAGE_FILE and pte_file()-related helpers
  ocfs2: set append dio as a ro compat feature
  ocfs2: wait for orphan recovery first once append O_DIRECT write crash
  ocfs2: complete the rest request through buffer io
  ocfs2: do not fallback to buffer I/O write if appending
  ocfs2: allocate blocks in ocfs2_direct_IO_get_blocks
  ocfs2: implement ocfs2_direct_IO_write
  ocfs2: add orphan recovery types in ocfs2_recover_orphans
  ocfs2: add functions to add and remove inode in orphan dir
  ocfs2: prepare some interfaces used in append direct io
  MAINTAINERS: fix spelling mistake & remove trailing WS
  dax: does not work correctly with virtual aliasing caches
  brd: rename XIP to DAX
  ext4: add DAX functionality
  dax: add dax_zero_page_range
  ext2: get rid of most mentions of XIP in ext2
  ext2: remove ext2_aops_xip
  ...

1 files changed, 21 insertions, 17 deletions

diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 36d35c36311d..6434bc000125 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -34,7 +34,6 @@
 #include <linux/aio.h>
 #include "ext2.h"
 #include "acl.h"
-#include "xip.h"
 #include "xattr.h"
 
 static int __ext2_write_inode(struct inode *inode, int do_sync);
@@ -731,12 +730,14 @@ static int ext2_get_blocks(struct inode *inode,
                 goto cleanup;
         }
 
-        if (ext2_use_xip(inode->i_sb)) {
+        if (IS_DAX(inode)) {
                 /*
-                 * we need to clear the block
+                 * block must be initialised before we put it in the tree
+                 * so that it's not found by another thread before it's
+                 * initialised
                  */
-                err = ext2_clear_xip_target (inode,
-                        le32_to_cpu(chain[depth-1].key));
+                err = dax_clear_blocks(inode, le32_to_cpu(chain[depth-1].key),
+                                                1 << inode->i_blkbits);
                 if (err) {
                         mutex_unlock(&ei->truncate_mutex);
                         goto cleanup;
@@ -859,7 +860,12 @@ ext2_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
         size_t count = iov_iter_count(iter);
         ssize_t ret;
 
-        ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, ext2_get_block);
+        if (IS_DAX(inode))
+                ret = dax_do_io(rw, iocb, inode, iter, offset, ext2_get_block,
+                                NULL, DIO_LOCKING);
+        else
+                ret = blockdev_direct_IO(rw, iocb, inode, iter, offset,
+                                         ext2_get_block);
         if (ret < 0 && (rw & WRITE))
                 ext2_write_failed(mapping, offset + count);
         return ret;
@@ -885,11 +891,6 @@ const struct address_space_operations ext2_aops = {
         .error_remove_page      = generic_error_remove_page,
 };
 
-const struct address_space_operations ext2_aops_xip = {
-        .bmap                   = ext2_bmap,
-        .get_xip_mem            = ext2_get_xip_mem,
-};
-
 const struct address_space_operations ext2_nobh_aops = {
         .readpage               = ext2_readpage,
         .readpages              = ext2_readpages,
@@ -1201,8 +1202,8 @@ static int ext2_setsize(struct inode *inode, loff_t newsize)
 
         inode_dio_wait(inode);
 
-        if (mapping_is_xip(inode->i_mapping))
-                error = xip_truncate_page(inode->i_mapping, newsize);
+        if (IS_DAX(inode))
+                error = dax_truncate_page(inode, newsize, ext2_get_block);
         else if (test_opt(inode->i_sb, NOBH))
                 error = nobh_truncate_page(inode->i_mapping,
                                 newsize, ext2_get_block);
@@ -1273,7 +1274,8 @@ void ext2_set_inode_flags(struct inode *inode)
 {
         unsigned int flags = EXT2_I(inode)->i_flags;
 
-        inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
+        inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
+                                S_DIRSYNC | S_DAX);
         if (flags & EXT2_SYNC_FL)
                 inode->i_flags |= S_SYNC;
         if (flags & EXT2_APPEND_FL)
@@ -1284,6 +1286,8 @@ void ext2_set_inode_flags(struct inode *inode)
                 inode->i_flags |= S_NOATIME;
         if (flags & EXT2_DIRSYNC_FL)
                 inode->i_flags |= S_DIRSYNC;
+        if (test_opt(inode->i_sb, DAX))
+                inode->i_flags |= S_DAX;
 }
 
 /* Propagate flags from i_flags to EXT2_I(inode)->i_flags */
@@ -1384,9 +1388,9 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino)
 
         if (S_ISREG(inode->i_mode)) {
                 inode->i_op = &ext2_file_inode_operations;
-                if (ext2_use_xip(inode->i_sb)) {
-                        inode->i_mapping->a_ops = &ext2_aops_xip;
-                        inode->i_fop = &ext2_xip_file_operations;
+                if (test_opt(inode->i_sb, DAX)) {
+                        inode->i_mapping->a_ops = &ext2_aops;
+                        inode->i_fop = &ext2_dax_file_operations;
                 } else if (test_opt(inode->i_sb, NOBH)) {
                         inode->i_mapping->a_ops = &ext2_nobh_aops;
                         inode->i_fop = &ext2_file_operations;