Merge branch 'akpm' (patches from Andrew)

c397f8fa · Linus Torvalds <[email protected]> · 2015-02-17 08:38:30 -08:00

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 <[email protected]>: (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
  ...

Commit: c397f8fa4379040bada53256c848e62c8b060392
Parents: 796e1c55 · aaaf5fbf

Merge commit. Changes below are compared with the first parent: 796e1c55.

Changes

72 files changed · +4491 −946

File	Status	Add	Del	Content
Documentation/filesystems/00-INDEX	modified	+3	−2	View file
Documentation/filesystems/Locking	modified	+0	−3	View file
Documentation/filesystems/dax.txt	added	+94	−0	View file
Documentation/filesystems/ext2.txt	modified	+3	−2	View file
Documentation/filesystems/ext4.txt	modified	+4	−0	View file
Documentation/filesystems/vfs.txt	modified	+0	−7	View file
Documentation/filesystems/xip.txt	deleted	+0	−71	View before deletion
MAINTAINERS	modified	+33	−1	View file
arch/arm/boot/dts/zynq-parallella.dts	modified	+1	−1	View file
arch/powerpc/include/asm/pgtable-ppc32.h	modified	+2	−7	View file
arch/powerpc/include/asm/pgtable-ppc64.h	modified	+1	−4	View file
arch/powerpc/include/asm/pgtable.h	modified	+0	−1	View file
arch/powerpc/include/asm/pte-40x.h	modified	+0	−1	View file
arch/powerpc/include/asm/pte-44x.h	modified	+0	−5	View file
arch/powerpc/include/asm/pte-8xx.h	modified	+0	−1	View file
arch/powerpc/include/asm/pte-book3e.h	modified	+0	−1	View file
arch/powerpc/include/asm/pte-fsl-booke.h	modified	+0	−3	View file
arch/powerpc/include/asm/pte-hash32.h	modified	+0	−1	View file
arch/powerpc/include/asm/pte-hash64.h	modified	+0	−1	View file
arch/powerpc/mm/pgtable_64.c	modified	+1	−1	View file
drivers/block/Kconfig	modified	+7	−6	View file
drivers/block/brd.c	modified	+7	−7	View file
drivers/rtc/Kconfig	modified	+90	−0	View file
drivers/rtc/Makefile	modified	+1	−0	View file
drivers/rtc/rtc-ds1685.c	added	+2252	−0	View file
drivers/rtc/rtc-isl12022.c	modified	+2	−1	View file
drivers/rtc/rtc-isl12057.c	modified	+2	−1	View file
drivers/staging/iio/light/isl29028.c	modified	+2	−2	View file
fs/Kconfig	modified	+15	−7	View file
fs/Makefile	modified	+1	−0	View file
fs/dax.c	added	+534	−0	View file
fs/exofs/inode.c	modified	+0	−1	View file
fs/ext2/Kconfig	modified	+0	−11	View file
fs/ext2/Makefile	modified	+0	−1	View file
fs/ext2/ext2.h	modified	+7	−3	View file
fs/ext2/file.c	modified	+38	−6	View file
fs/ext2/inode.c	modified	+21	−17	View file
fs/ext2/namei.c	modified	+6	−7	View file
fs/ext2/super.c	modified	+25	−28	View file
fs/ext2/xip.c	deleted	+0	−86	View before deletion
fs/ext2/xip.h	deleted	+0	−26	View before deletion
fs/ext4/ext4.h	modified	+6	−0	View file
fs/ext4/file.c	modified	+47	−2	View file
fs/ext4/indirect.c	modified	+13	−5	View file
fs/ext4/inode.c	modified	+62	−27	View file
fs/ext4/namei.c	modified	+8	−2	View file
fs/ext4/super.c	modified	+38	−1	View file
fs/ocfs2/aops.c	modified	+236	−6	View file
fs/ocfs2/file.c	modified	+71	−5	View file
fs/ocfs2/file.h	modified	+9	−0	View file
fs/ocfs2/inode.c	modified	+1	−1	View file
fs/ocfs2/inode.h	modified	+2	−0	View file
fs/ocfs2/journal.c	modified	+90	−20	View file
fs/ocfs2/journal.h	modified	+5	−0	View file
fs/ocfs2/namei.c	modified	+257	−27	View file
fs/ocfs2/namei.h	modified	+7	−1	View file
fs/ocfs2/ocfs2.h	modified	+23	−0	View file
fs/ocfs2/ocfs2_fs.h	modified	+12	−2	View file
fs/ocfs2/super.c	modified	+2	−0	View file
fs/open.c	modified	+1	−4	View file
include/linux/fs.h	modified	+19	−15	View file
include/linux/mm.h	modified	+1	−0	View file
include/linux/rmap.h	modified	+1	−1	View file
include/linux/rtc/ds1685.h	added	+375	−0	View file
lib/Kconfig	modified	+1	−1	View file
mm/Makefile	modified	+0	−1	View file
mm/fadvise.c	modified	+4	−2	View file
mm/filemap.c	modified	+14	−11	View file
mm/filemap_xip.c	deleted	+0	−478	View before deletion
mm/madvise.c	modified	+1	−1	View file
mm/memory.c	modified	+33	−9	View file
scripts/diffconfig	modified	+0	−1	View file

Only the first 600 diff lines are shown. Download the complete patch.

Documentation/filesystems/00-INDEX

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diff --git a/Documentation/filesystems/00-INDEX b/Documentation/filesystems/00-INDEX
index ac28149..9922939 100644
--- a/Documentation/filesystems/00-INDEX
+++ b/Documentation/filesystems/00-INDEX
@@ -34,6 +34,9 @@ configfs/
 	- directory containing configfs documentation and example code.
 cramfs.txt
 	- info on the cram filesystem for small storage (ROMs etc).
+dax.txt
+	- info on avoiding the page cache for files stored on CPU-addressable
+	  storage devices.
 debugfs.txt
 	- info on the debugfs filesystem.
 devpts.txt
@@ -154,5 +157,3 @@ xfs-self-describing-metadata.txt
 	- info on XFS Self Describing Metadata.
 xfs.txt
 	- info and mount options for the XFS filesystem.
-xip.txt
-	- info on execute-in-place for file mappings.

Documentation/filesystems/Locking

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diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index b30753c..2ca3d17 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -199,8 +199,6 @@ prototypes:
 	int (*releasepage) (struct page *, int);
 	void (*freepage)(struct page *);
 	int (*direct_IO)(int, struct kiocb *, struct iov_iter *iter, loff_t offset);
-	int (*get_xip_mem)(struct address_space *, pgoff_t, int, void **,
-				unsigned long *);
 	int (*migratepage)(struct address_space *, struct page *, struct page *);
 	int (*launder_page)(struct page *);
 	int (*is_partially_uptodate)(struct page *, unsigned long, unsigned long);
@@ -225,7 +223,6 @@ invalidatepage:		yes
 releasepage:		yes
 freepage:		yes
 direct_IO:
-get_xip_mem:					maybe
 migratepage:		yes (both)
 launder_page:		yes
 is_partially_uptodate:	yes

Documentation/filesystems/dax.txt

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diff --git a/Documentation/filesystems/dax.txt b/Documentation/filesystems/dax.txt
new file mode 100644
index 0000000..baf4111
--- /dev/null
+++ b/Documentation/filesystems/dax.txt
@@ -0,0 +1,94 @@
+Direct Access for files
+-----------------------
+
+Motivation
+----------
+
+The page cache is usually used to buffer reads and writes to files.
+It is also used to provide the pages which are mapped into userspace
+by a call to mmap.
+
+For block devices that are memory-like, the page cache pages would be
+unnecessary copies of the original storage.  The DAX code removes the
+extra copy by performing reads and writes directly to the storage device.
+For file mappings, the storage device is mapped directly into userspace.
+
+
+Usage
+-----
+
+If you have a block device which supports DAX, you can make a filesystem
+on it as usual.  When mounting it, use the -o dax option manually
+or add 'dax' to the options in /etc/fstab.
+
+
+Implementation Tips for Block Driver Writers
+--------------------------------------------
+
+To support DAX in your block driver, implement the 'direct_access'
+block device operation.  It is used to translate the sector number
+(expressed in units of 512-byte sectors) to a page frame number (pfn)
+that identifies the physical page for the memory.  It also returns a
+kernel virtual address that can be used to access the memory.
+
+The direct_access method takes a 'size' parameter that indicates the
+number of bytes being requested.  The function should return the number
+of bytes that can be contiguously accessed at that offset.  It may also
+return a negative errno if an error occurs.
+
+In order to support this method, the storage must be byte-accessible by
+the CPU at all times.  If your device uses paging techniques to expose
+a large amount of memory through a smaller window, then you cannot
+implement direct_access.  Equally, if your device can occasionally
+stall the CPU for an extended period, you should also not attempt to
+implement direct_access.
+
+These block devices may be used for inspiration:
+- axonram: Axon DDR2 device driver
+- brd: RAM backed block device driver
+- dcssblk: s390 dcss block device driver
+
+
+Implementation Tips for Filesystem Writers
+------------------------------------------
+
+Filesystem support consists of
+- adding support to mark inodes as being DAX by setting the S_DAX flag in
+  i_flags
+- implementing the direct_IO address space operation, and calling
+  dax_do_io() instead of blockdev_direct_IO() if S_DAX is set
+- implementing an mmap file operation for DAX files which sets the
+  VM_MIXEDMAP flag on the VMA, and setting the vm_ops to include handlers
+  for fault and page_mkwrite (which should probably call dax_fault() and
+  dax_mkwrite(), passing the appropriate get_block() callback)
+- calling dax_truncate_page() instead of block_truncate_page() for DAX files
+- calling dax_zero_page_range() instead of zero_user() for DAX files
+- ensuring that there is sufficient locking between reads, writes,
+  truncates and page faults
+
+The get_block() callback passed to the DAX functions may return
+uninitialised extents.  If it does, it must ensure that simultaneous
+calls to get_block() (for example by a page-fault racing with a read()
+or a write()) work correctly.
+
+These filesystems may be used for inspiration:
+- ext2: the second extended filesystem, see Documentation/filesystems/ext2.txt
+- ext4: the fourth extended filesystem, see Documentation/filesystems/ext4.txt
+
+
+Shortcomings
+------------
+
+Even if the kernel or its modules are stored on a filesystem that supports
+DAX on a block device that supports DAX, they will still be copied into RAM.
+
+The DAX code does not work correctly on architectures which have virtually
+mapped caches such as ARM, MIPS and SPARC.
+
+Calling get_user_pages() on a range of user memory that has been mmaped
+from a DAX file will fail as there are no 'struct page' to describe
+those pages.  This problem is being worked on.  That means that O_DIRECT
+reads/writes to those memory ranges from a non-DAX file will fail (note
+that O_DIRECT reads/writes _of a DAX file_ do work, it is the memory
+that is being accessed that is key here).  Other things that will not
+work include RDMA, sendfile() and splice().

Documentation/filesystems/ext2.txt

View file

diff --git a/Documentation/filesystems/ext2.txt b/Documentation/filesystems/ext2.txt
index 67639f9..b971456 100644
--- a/Documentation/filesystems/ext2.txt
+++ b/Documentation/filesystems/ext2.txt
@@ -20,6 +20,9 @@ minixdf				Makes `df' act like Minix.
 check=none, nocheck	(*)	Don't do extra checking of bitmaps on mount
 				(check=normal and check=strict options removed)
 
+dax				Use direct access (no page cache).  See
+				Documentation/filesystems/dax.txt.
+
 debug				Extra debugging information is sent to the
 				kernel syslog.  Useful for developers.
 
@@ -56,8 +59,6 @@ noacl				Don't support POSIX ACLs.
 
 nobh				Do not attach buffer_heads to file pagecache.
 
-xip				Use execute in place (no caching) if possible
-
 grpquota,noquota,quota,usrquota	Quota options are silently ignored by ext2.
 
 

Documentation/filesystems/ext4.txt

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diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index 919a329..6c0108e 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -386,6 +386,10 @@ max_dir_size_kb=n	This limits the size of directories so that any
 i_version		Enable 64-bit inode version support. This option is
 			off by default.
 
+dax			Use direct access (no page cache).  See
+			Documentation/filesystems/dax.txt.  Note that
+			this option is incompatible with data=journal.
+
 Data Mode
 =========
 There are 3 different data modes:

Documentation/filesystems/vfs.txt

View file

diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 43ce050..966b228 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -591,8 +591,6 @@ struct address_space_operations {
 	int (*releasepage) (struct page *, int);
 	void (*freepage)(struct page *);
 	ssize_t (*direct_IO)(int, struct kiocb *, struct iov_iter *iter, loff_t offset);
-	struct page* (*get_xip_page)(struct address_space *, sector_t,
-			int);
 	/* migrate the contents of a page to the specified target */
 	int (*migratepage) (struct page *, struct page *);
 	int (*launder_page) (struct page *);
@@ -748,11 +746,6 @@ struct address_space_operations {
         and transfer data directly between the storage and the
         application's address space.
 
-  get_xip_page: called by the VM to translate a block number to a page.
-	The page is valid until the corresponding filesystem is unmounted.
-	Filesystems that want to use execute-in-place (XIP) need to implement
-	it.  An example implementation can be found in fs/ext2/xip.c.
-
   migrate_page:  This is used to compact the physical memory usage.
         If the VM wants to relocate a page (maybe off a memory card
         that is signalling imminent failure) it will pass a new page

Documentation/filesystems/xip.txt

View before deletion

diff --git a/Documentation/filesystems/xip.txt b/Documentation/filesystems/xip.txt
deleted file mode 100644
index b774729..0000000
--- a/Documentation/filesystems/xip.txt
+++ /dev/null
@@ -1,71 +0,0 @@
-Execute-in-place for file mappings
-----------------------------------
-
-Motivation
-----------
-File mappings are performed by mapping page cache pages to userspace. In
-addition, read&write type file operations also transfer data from/to the page
-cache.
-
-For memory backed storage devices that use the block device interface, the page
-cache pages are in fact copies of the original storage. Various approaches
-exist to work around the need for an extra copy. The ramdisk driver for example
-does read the data into the page cache, keeps a reference, and discards the
-original data behind later on.
-
-Execute-in-place solves this issue the other way around: instead of keeping
-data in the page cache, the need to have a page cache copy is eliminated
-completely. With execute-in-place, read&write type operations are performed
-directly from/to the memory backed storage device. For file mappings, the
-storage device itself is mapped directly into userspace.
-
-This implementation was initially written for shared memory segments between
-different virtual machines on s390 hardware to allow multiple machines to
-share the same binaries and libraries.
-
-Implementation
---------------
-Execute-in-place is implemented in three steps: block device operation,
-address space operation, and file operations.
-
-A block device operation named direct_access is used to translate the
-block device sector number to a page frame number (pfn) that identifies
-the physical page for the memory.  It also returns a kernel virtual
-address that can be used to access the memory.
-
-The direct_access method takes a 'size' parameter that indicates the
-number of bytes being requested.  The function should return the number
-of bytes that can be contiguously accessed at that offset.  It may also
-return a negative errno if an error occurs.
-
-The block device operation is optional, these block devices support it as of
-today:
-- dcssblk: s390 dcss block device driver
-
-An address space operation named get_xip_mem is used to retrieve references
-to a page frame number and a kernel address. To obtain these values a reference
-to an address_space is provided. This function assigns values to the kmem and
-pfn parameters. The third argument indicates whether the function should allocate
-blocks if needed.
-
-This address space operation is mutually exclusive with readpage&writepage that
-do page cache read/write operations.
-The following filesystems support it as of today:
-- ext2: the second extended filesystem, see Documentation/filesystems/ext2.txt
-
-A set of file operations that do utilize get_xip_page can be found in
-mm/filemap_xip.c . The following file operation implementations are provided:
-- aio_read/aio_write
-- readv/writev
-- sendfile
-
-The generic file operations do_sync_read/do_sync_write can be used to implement
-classic synchronous IO calls.
-
-Shortcomings
-------------
-This implementation is limited to storage devices that are cpu addressable at
-all times (no highmem or such). It works well on rom/ram, but enhancements are
-needed to make it work with flash in read+write mode.
-Putting the Linux kernel and/or its modules on a xip filesystem does not mean
-they are not copied.

MAINTAINERS

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diff --git a/MAINTAINERS b/MAINTAINERS
index 0beaaac..e75c218 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -34,7 +34,7 @@ trivial patch so apply some common sense.
 	generalized kernel feature ready for next time.
 
 	PLEASE check your patch with the automated style checker
-	(scripts/checkpatch.pl) to catch trival style violations.
+	(scripts/checkpatch.pl) to catch trivial style violations.
 	See Documentation/CodingStyle for guidance here.
 
 	PLEASE CC: the maintainers and mailing lists that are generated
@@ -2965,6 +2965,12 @@ S:	Supported
 F:	drivers/input/touchscreen/cyttsp*
 F:	include/linux/input/cyttsp.h
 
+DALLAS/MAXIM DS1685-FAMILY REAL TIME CLOCK
+M:	Joshua Kinard <[email protected]>
+S:	Maintained
+F:	drivers/rtc/rtc-ds1685.c
+F:	include/linux/rtc/ds1685.h
+
 DAMA SLAVE for AX.25
 M:	Joerg Reuter <[email protected]>
 W:	http://yaina.de/jreuter/
@@ -3153,6 +3159,12 @@ L:	[email protected]
 S:	Maintained
 F:	drivers/i2c/busses/i2c-diolan-u2c.c
 
+DIRECT ACCESS (DAX)
+M:	Matthew Wilcox <[email protected]>
+L:	[email protected]
+S:	Supported
+F:	fs/dax.c
+
 DIRECTORY NOTIFICATION (DNOTIFY)
 M:	Eric Paris <[email protected]>
 S:	Maintained
@@ -6212,6 +6224,26 @@ S:	Supported
 F:	drivers/power/max14577_charger.c
 F:	drivers/power/max77693_charger.c
 
+MAXIM PMIC AND MUIC DRIVERS FOR EXYNOS BASED BOARDS
+M:	Chanwoo Choi <[email protected]>
+M:	Krzysztof Kozlowski <[email protected]>
+L:	[email protected]
+S:	Supported
+F:	drivers/*/max14577.c
+F:	drivers/*/max77686.c
+F:	drivers/*/max77693.c
+F:	drivers/extcon/extcon-max14577.c
+F:	drivers/extcon/extcon-max77693.c
+F:	drivers/rtc/rtc-max77686.c
+F:	drivers/clk/clk-max77686.c
+F:	Documentation/devicetree/bindings/mfd/max14577.txt
+F:	Documentation/devicetree/bindings/mfd/max77686.txt
+F:	Documentation/devicetree/bindings/mfd/max77693.txt
+F:	Documentation/devicetree/bindings/clock/maxim,max77686.txt
+F:	include/linux/mfd/max14577*.h
+F:	include/linux/mfd/max77686*.h
+F:	include/linux/mfd/max77693*.h
+
 MAXIRADIO FM RADIO RECEIVER DRIVER
 M:	Hans Verkuil <[email protected]>
 L:	[email protected]

arch/arm/boot/dts/zynq-parallella.dts

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diff --git a/arch/arm/boot/dts/zynq-parallella.dts b/arch/arm/boot/dts/zynq-parallella.dts
index ab1dc0a..1745712 100644
--- a/arch/arm/boot/dts/zynq-parallella.dts
+++ b/arch/arm/boot/dts/zynq-parallella.dts
@@ -58,7 +58,7 @@
 	status = "okay";
 
 	isl9305: isl9305@68 {
-		compatible = "isl,isl9305";
+		compatible = "isil,isl9305";
 		reg = <0x68>;
 
 		regulators {

arch/powerpc/include/asm/pgtable-ppc32.h

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diff --git a/arch/powerpc/include/asm/pgtable-ppc32.h b/arch/powerpc/include/asm/pgtable-ppc32.h
index 14bdcbd..64b52b1 100644
--- a/arch/powerpc/include/asm/pgtable-ppc32.h
+++ b/arch/powerpc/include/asm/pgtable-ppc32.h
@@ -333,8 +333,8 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
 /*
  * Encode and decode a swap entry.
  * Note that the bits we use in a PTE for representing a swap entry
- * must not include the _PAGE_PRESENT bit, the _PAGE_FILE bit, or the
- *_PAGE_HASHPTE bit (if used).  -- paulus
+ * must not include the _PAGE_PRESENT bit or the _PAGE_HASHPTE bit (if used).
+ *   -- paulus
  */
 #define __swp_type(entry)		((entry).val & 0x1f)
 #define __swp_offset(entry)		((entry).val >> 5)
@@ -342,11 +342,6 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) >> 3 })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val << 3 })
 
-/* Encode and decode a nonlinear file mapping entry */
-#define PTE_FILE_MAX_BITS	29
-#define pte_to_pgoff(pte)	(pte_val(pte) >> 3)
-#define pgoff_to_pte(off)	((pte_t) { ((off) << 3) | _PAGE_FILE })
-
 #ifndef CONFIG_PPC_4K_PAGES
 void pgtable_cache_init(void);
 #else

arch/powerpc/include/asm/pgtable-ppc64.h

View file

diff --git a/arch/powerpc/include/asm/pgtable-ppc64.h b/arch/powerpc/include/asm/pgtable-ppc64.h
index d46532c..43e6ad4 100644
--- a/arch/powerpc/include/asm/pgtable-ppc64.h
+++ b/arch/powerpc/include/asm/pgtable-ppc64.h
@@ -352,9 +352,6 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
 #define __swp_entry(type, offset) ((swp_entry_t){((type)<< 1)|((offset)<<8)})
 #define __pte_to_swp_entry(pte)	((swp_entry_t){pte_val(pte) >> PTE_RPN_SHIFT})
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val << PTE_RPN_SHIFT })
-#define pte_to_pgoff(pte)	(pte_val(pte) >> PTE_RPN_SHIFT)
-#define pgoff_to_pte(off)	((pte_t) {((off) << PTE_RPN_SHIFT)|_PAGE_FILE})
-#define PTE_FILE_MAX_BITS	(BITS_PER_LONG - PTE_RPN_SHIFT)
 
 void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
 void pgtable_cache_init(void);
@@ -389,7 +386,7 @@ void pgtable_cache_init(void);
  * The last three bits are intentionally left to zero. This memory location
  * are also used as normal page PTE pointers. So if we have any pointers
  * left around while we collapse a hugepage, we need to make sure
- * _PAGE_PRESENT and _PAGE_FILE bits of that are zero when we look at them
+ * _PAGE_PRESENT bit of that is zero when we look at them
  */
 static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index)
 {

arch/powerpc/include/asm/pgtable.h

View file

diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 79fee2e..9835ac4 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -34,7 +34,6 @@ static inline int pte_write(pte_t pte)
 {	return (pte_val(pte) & (_PAGE_RW | _PAGE_RO)) != _PAGE_RO; }
 static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
 static inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_file(pte_t pte)		{ return pte_val(pte) & _PAGE_FILE; }
 static inline int pte_special(pte_t pte)	{ return pte_val(pte) & _PAGE_SPECIAL; }
 static inline int pte_none(pte_t pte)		{ return (pte_val(pte) & ~_PTE_NONE_MASK) == 0; }
 static inline pgprot_t pte_pgprot(pte_t pte)	{ return __pgprot(pte_val(pte) & PAGE_PROT_BITS); }

arch/powerpc/include/asm/pte-40x.h

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diff --git a/arch/powerpc/include/asm/pte-40x.h b/arch/powerpc/include/asm/pte-40x.h
index ec0b0b0..486b1ef 100644
--- a/arch/powerpc/include/asm/pte-40x.h
+++ b/arch/powerpc/include/asm/pte-40x.h
@@ -38,7 +38,6 @@
  */
 
 #define	_PAGE_GUARDED	0x001	/* G: page is guarded from prefetch */
-#define _PAGE_FILE	0x001	/* when !present: nonlinear file mapping */
 #define _PAGE_PRESENT	0x002	/* software: PTE contains a translation */
 #define	_PAGE_NO_CACHE	0x004	/* I: caching is inhibited */
 #define	_PAGE_WRITETHRU	0x008	/* W: caching is write-through */

arch/powerpc/include/asm/pte-44x.h

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diff --git a/arch/powerpc/include/asm/pte-44x.h b/arch/powerpc/include/asm/pte-44x.h
index 4192b9b..36f75fa 100644
--- a/arch/powerpc/include/asm/pte-44x.h
+++ b/arch/powerpc/include/asm/pte-44x.h
@@ -44,9 +44,6 @@
  *   - PRESENT *must* be in the bottom three bits because swap cache
  *     entries use the top 29 bits for TLB2.
  *
- *   - FILE *must* be in the bottom three bits because swap cache
- *     entries use the top 29 bits for TLB2.
- *
  *   - CACHE COHERENT bit (M) has no effect on original PPC440 cores,
  *     because it doesn't support SMP. However, some later 460 variants
  *     have -some- form of SMP support and so I keep the bit there for
@@ -68,7 +65,6 @@
  *
  * There are three protection bits available for SWAP entry:
  *	_PAGE_PRESENT
- *	_PAGE_FILE
  *	_PAGE_HASHPTE (if HW has)
  *
  * So those three bits have to be inside of 0-2nd LSB of PTE.
@@ -77,7 +73,6 @@
 
 #define _PAGE_PRESENT	0x00000001		/* S: PTE valid */
 #define _PAGE_RW	0x00000002		/* S: Write permission */
-#define _PAGE_FILE	0x00000004		/* S: nonlinear file mapping */
 #define _PAGE_EXEC	0x00000004		/* H: Execute permission */
 #define _PAGE_ACCESSED	0x00000008		/* S: Page referenced */
 #define _PAGE_DIRTY	0x00000010		/* S: Page dirty */

arch/powerpc/include/asm/pte-8xx.h

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diff --git a/arch/powerpc/include/asm/pte-8xx.h b/arch/powerpc/include/asm/pte-8xx.h
index eb6edb4..97bae64 100644
--- a/arch/powerpc/include/asm/pte-8xx.h
+++ b/arch/powerpc/include/asm/pte-8xx.h
@@ -29,7 +29,6 @@
 
 /* Definitions for 8xx embedded chips. */
 #define _PAGE_PRESENT	0x0001	/* Page is valid */
-#define _PAGE_FILE	0x0002	/* when !present: nonlinear file mapping */
 #define _PAGE_NO_CACHE	0x0002	/* I: cache inhibit */
 #define _PAGE_SHARED	0x0004	/* No ASID (context) compare */
 #define _PAGE_SPECIAL	0x0008	/* SW entry, forced to 0 by the TLB miss */

arch/powerpc/include/asm/pte-book3e.h

View file

diff --git a/arch/powerpc/include/asm/pte-book3e.h b/arch/powerpc/include/asm/pte-book3e.h
index 576ad88..91a7049 100644
--- a/arch/powerpc/include/asm/pte-book3e.h
+++ b/arch/powerpc/include/asm/pte-book3e.h
@@ -10,7 +10,6 @@
 
 /* Architected bits */
 #define _PAGE_PRESENT	0x000001 /* software: pte contains a translation */
-#define _PAGE_FILE	0x000002 /* (!present only) software: pte holds file offset */
 #define _PAGE_SW1	0x000002
 #define _PAGE_BAP_SR	0x000004
 #define _PAGE_BAP_UR	0x000008

arch/powerpc/include/asm/pte-fsl-booke.h

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diff --git a/arch/powerpc/include/asm/pte-fsl-booke.h b/arch/powerpc/include/asm/pte-fsl-booke.h
index e84dd7e..9f5c3d0 100644
--- a/arch/powerpc/include/asm/pte-fsl-booke.h
+++ b/arch/powerpc/include/asm/pte-fsl-booke.h
@@ -13,14 +13,11 @@
    - PRESENT *must* be in the bottom three bits because swap cache
      entries use the top 29 bits.
 
-   - FILE *must* be in the bottom three bits because swap cache
-     entries use the top 29 bits.
 */
 
 /* Definitions for FSL Book-E Cores */
 #define _PAGE_PRESENT	0x00001	/* S: PTE contains a translation */
 #define _PAGE_USER	0x00002	/* S: User page (maps to UR) */
-#define _PAGE_FILE	0x00002	/* S: when !present: nonlinear file mapping */
 #define _PAGE_RW	0x00004	/* S: Write permission (SW) */
 #define _PAGE_DIRTY	0x00008	/* S: Page dirty */
 #define _PAGE_EXEC	0x00010	/* H: SX permission */

arch/powerpc/include/asm/pte-hash32.h

View file

diff --git a/arch/powerpc/include/asm/pte-hash32.h b/arch/powerpc/include/asm/pte-hash32.h
index 4aad413..62cfb0c 100644
--- a/arch/powerpc/include/asm/pte-hash32.h
+++ b/arch/powerpc/include/asm/pte-hash32.h
@@ -18,7 +18,6 @@
 
 #define _PAGE_PRESENT	0x001	/* software: pte contains a translation */
 #define _PAGE_HASHPTE	0x002	/* hash_page has made an HPTE for this pte */
-#define _PAGE_FILE	0x004	/* when !present: nonlinear file mapping */
 #define _PAGE_USER	0x004	/* usermode access allowed */
 #define _PAGE_GUARDED	0x008	/* G: prohibit speculative access */
 #define _PAGE_COHERENT	0x010	/* M: enforce memory coherence (SMP systems) */

arch/powerpc/include/asm/pte-hash64.h

View file

diff --git a/arch/powerpc/include/asm/pte-hash64.h b/arch/powerpc/include/asm/pte-hash64.h
index 55aea0c..fc852f7 100644
--- a/arch/powerpc/include/asm/pte-hash64.h
+++ b/arch/powerpc/include/asm/pte-hash64.h
@@ -16,7 +16,6 @@
  */
 #define _PAGE_PRESENT		0x0001 /* software: pte contains a translation */
 #define _PAGE_USER		0x0002 /* matches one of the PP bits */
-#define _PAGE_FILE		0x0002 /* (!present only) software: pte holds file offset */
 #define _PAGE_EXEC		0x0004 /* No execute on POWER4 and newer (we invert) */
 #define _PAGE_GUARDED		0x0008
 /* We can derive Memory coherence from _PAGE_NO_CACHE */

arch/powerpc/mm/pgtable_64.c

View file

diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 91bb883..6957cc1 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -782,7 +782,7 @@ pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot)
 {
 	pmd_t pmd;
 	/*
-	 * For a valid pte, we would have _PAGE_PRESENT or _PAGE_FILE always
+	 * For a valid pte, we would have _PAGE_PRESENT always
 	 * set. We use this to check THP page at pmd level.
 	 * leaf pte for huge page, bottom two bits != 00
 	 */

drivers/block/Kconfig

View file

diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 014a1cf..1b8094d 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -393,14 +393,15 @@ config BLK_DEV_RAM_SIZE
 	  The default value is 4096 kilobytes. Only change this if you know
 	  what you are doing.
 
-config BLK_DEV_XIP
-	bool "Support XIP filesystems on RAM block device"
-	depends on BLK_DEV_RAM
+config BLK_DEV_RAM_DAX
+	bool "Support Direct Access (DAX) to RAM block devices"
+	depends on BLK_DEV_RAM && FS_DAX
 	default n
 	help
-	  Support XIP filesystems (such as ext2 with XIP support on) on
-	  top of block ram device. This will slightly enlarge the kernel, and
-	  will prevent RAM block device backing store memory from being
+	  Support filesystems using DAX to access RAM block devices.  This
+	  avoids double-buffering data in the page cache before copying it
+	  to the block device.  Answering Y will slightly enlarge the kernel,
+	  and will prevent RAM block device backing store memory from being
 	  allocated from highmem (only a problem for highmem systems).
 
 config CDROM_PKTCDVD

drivers/block/brd.c

View file

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index c01b921..64ab495 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -97,13 +97,13 @@ static struct page *brd_insert_page(struct brd_device *brd, sector_t sector)
 	 * Must use NOIO because we don't want to recurse back into the
 	 * block or filesystem layers from page reclaim.
 	 *
-	 * Cannot support XIP and highmem, because our ->direct_access
-	 * routine for XIP must return memory that is always addressable.
-	 * If XIP was reworked to use pfns and kmap throughout, this
+	 * Cannot support DAX and highmem, because our ->direct_access
+	 * routine for DAX must return memory that is always addressable.
+	 * If DAX was reworked to use pfns and kmap throughout, this
 	 * restriction might be able to be lifted.
 	 */
 	gfp_flags = GFP_NOIO | __GFP_ZERO;
-#ifndef CONFIG_BLK_DEV_XIP
+#ifndef CONFIG_BLK_DEV_RAM_DAX
 	gfp_flags |= __GFP_HIGHMEM;
 #endif
 	page = alloc_page(gfp_flags);
@@ -369,7 +369,7 @@ static int brd_rw_page(struct block_device *bdev, sector_t sector,
 	return err;
 }
 
-#ifdef CONFIG_BLK_DEV_XIP
+#ifdef CONFIG_BLK_DEV_RAM_DAX
 static long brd_direct_access(struct block_device *bdev, sector_t sector,
 			void **kaddr, unsigned long *pfn, long size)