[PATCH v10 16/21] Remove CONFIG_EXT2_FS_XIP and rename CONFIG_FS_XIP to CONFIG_FS_DAX

Matthew Wilcox
2014-08-27T04:37:41Z

The fewer Kconfig options we have the better. Use the generic
CONFIG_FS_DAX to enable XIP support in ext2 as well as in the core.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
---
fs/Kconfig | 21 ++++++++++++++-------
fs/Makefile | 2 +-
fs/ext2/Kconfig | 11 -----------
fs/ext2/ext2.h | 2 +-
fs/ext2/file.c | 4 ++--
fs/ext2/super.c | 4 ++--
include/linux/fs.h | 4 ++--
7 files changed, 22 insertions(+), 26 deletions(-)

diff --git a/fs/Kconfig b/fs/Kconfig
index 312393f..a9eb53d 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -13,13 +13,6 @@ if BLOCK
source "fs/ext2/Kconfig"
source "fs/ext3/Kconfig"
source "fs/ext4/Kconfig"
-
-config FS_XIP
-# execute in place
- bool
- depends on EXT2_FS_XIP
- default y
-
source "fs/jbd/Kconfig"
source "fs/jbd2/Kconfig"

@@ -40,6 +33,20 @@ source "fs/ocfs2/Kconfig"
source "fs/btrfs/Kconfig"
source "fs/nilfs2/Kconfig"

+config FS_DAX
+ bool "Direct Access support"
+ depends on MMU
+ help
+ Direct Access (DAX) can be used on memory-backed block devices.
+ If the block device supports DAX and the filesystem supports DAX,
+ then you can avoid using the pagecache to buffer I/Os. Turning
+ on this option will compile in support for DAX; you will need to
+ mount the filesystem using the -o xip option.
+
+ If you do not have a block device that is capable of using this,
+ or if unsure, say N. Saying Y will increase the size of the kernel
+ by about 2kB.
+
endif # BLOCK

# Posix ACL utility routines
diff --git a/fs/Makefile b/fs/Makefile
index 0325ec3..df4a4cf 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -28,7 +28,7 @@ obj-$(CONFIG_SIGNALFD) += signalfd.o
obj-$(CONFIG_TIMERFD) += timerfd.o
obj-$(CONFIG_EVENTFD) += eventfd.o
obj-$(CONFIG_AIO) += aio.o
-obj-$(CONFIG_FS_XIP) += dax.o
+obj-$(CONFIG_FS_DAX) += dax.o
obj-$(CONFIG_FILE_LOCKING) += locks.o
obj-$(CONFIG_COMPAT) += compat.o compat_ioctl.o
obj-$(CONFIG_BINFMT_AOUT) += binfmt_aout.o
diff --git a/fs/ext2/Kconfig b/fs/ext2/Kconfig
index 14a6780..c634874e 100644
--- a/fs/ext2/Kconfig
+++ b/fs/ext2/Kconfig
@@ -42,14 +42,3 @@ config EXT2_FS_SECURITY

If you are not using a security module that requires using
extended attributes for file security labels, say N.
-
-config EXT2_FS_XIP
- bool "Ext2 execute in place support"
- depends on EXT2_FS && MMU
- help
- Execute in place can be used on memory-backed block devices. If you
- enable this option, you can select to mount block devices which are
- capable of this feature without using the page cache.
-
- If you do not use a block device that is capable of using this,
- or if unsure, say N.
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 5ecf570..b30c3bd 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -380,7 +380,7 @@ struct ext2_inode {
#define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
#define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
#define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
-#ifdef CONFIG_FS_XIP
+#ifdef CONFIG_FS_DAX
#define EXT2_MOUNT_XIP 0x010000 /* Execute in place */
#else
#define EXT2_MOUNT_XIP 0
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index da8dc64..46b333d 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -25,7 +25,7 @@
#include "xattr.h"
#include "acl.h"

-#ifdef CONFIG_EXT2_FS_XIP
+#ifdef CONFIG_FS_DAX
static int ext2_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
return dax_fault(vma, vmf, ext2_get_block);
@@ -109,7 +109,7 @@ const struct file_operations ext2_file_operations = {
.splice_write = iter_file_splice_write,
};

-#ifdef CONFIG_EXT2_FS_XIP
+#ifdef CONFIG_FS_DAX
const struct file_operations ext2_xip_file_operations = {
.llseek = generic_file_llseek,
.read = new_sync_read,
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 0393c6d..feb53d8 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -287,7 +287,7 @@ static int ext2_show_options(struct seq_file *seq, struct dentry *root)
seq_puts(seq, ",grpquota");
#endif

-#if defined(CONFIG_EXT2_FS_XIP)
+#ifdef CONFIG_FS_DAX
if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
seq_puts(seq, ",xip");
#endif
@@ -549,7 +549,7 @@ static int parse_options(char *options, struct super_block *sb)
break;
#endif
case Opt_xip:
-#ifdef CONFIG_EXT2_FS_XIP
+#ifdef CONFIG_FS_DAX
set_opt (sbi->s_mount_opt, XIP);
#else
ext2_msg(sb, KERN_INFO, "xip option not supported");
diff --git a/include/linux/fs.h b/include/linux/fs.h
index d73db11..e6b48cc 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1642,7 +1642,7 @@ struct super_operations {
#define IS_IMA(inode) ((inode)->i_flags & S_IMA)
#define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
#define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
-#ifdef CONFIG_FS_XIP
+#ifdef CONFIG_FS_DAX
#define IS_DAX(inode) ((inode)->i_flags & S_DAX)
#else
#define IS_DAX(inode) 0
@@ -2488,7 +2488,7 @@ extern loff_t fixed_size_llseek(struct file *file, loff_t offset,
extern int generic_file_open(struct inode * inode, struct file * filp);
extern int nonseekable_open(struct inode * inode, struct file * filp);

-#ifdef CONFIG_FS_XIP
+#ifdef CONFIG_FS_DAX
int dax_clear_blocks(struct inode *, sector_t block, long size);
int dax_truncate_page(struct inode *, loff_t from, get_block_t);
ssize_t dax_do_io(int rw, struct kiocb *, struct inode *, struct iov_iter *,
--
2.0.0