The patch titled
Subject: dax,ext2: replace ext2_clear_xip_target with dax_clear_blocks
has been removed from the -mm tree. Its filename was
daxext2-replace-ext2_clear_xip_target-with-dax_clear_blocks.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>
Subject: dax,ext2: replace ext2_clear_xip_target with dax_clear_blocks
This is practically generic code; other filesystems will want to call it
from other places, but there's nothing ext2-specific about it.
Make it a little more generic by allowing it to take a count of the number
of bytes to zero rather than fixing it to a single page. Thanks to Dave
Hansen for suggesting that I need to call cond_resched() if zeroing more
than one page.
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>
Cc: Andreas Dilger <andreas.dilger@xxxxxxxxx>
Cc: Boaz Harrosh <boaz@xxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/dax.c | 37 +++++++++++++++++++++++++++++++++++++
fs/ext2/inode.c | 8 +++++---
fs/ext2/xip.c | 14 --------------
fs/ext2/xip.h | 3 ---
include/linux/fs.h | 1 +
5 files changed, 43 insertions(+), 20 deletions(-)
diff -puN fs/dax.c~daxext2-replace-ext2_clear_xip_target-with-dax_clear_blocks fs/dax.c
--- a/fs/dax.c~daxext2-replace-ext2_clear_xip_target-with-dax_clear_blocks
+++ a/fs/dax.c
@@ -20,8 +20,45 @@
#include <linux/fs.h>
#include <linux/genhd.h>
#include <linux/mutex.h>
+#include <linux/sched.h>
#include <linux/uio.h>
+int dax_clear_blocks(struct inode *inode, sector_t block, long size)
+{
+ struct block_device *bdev = inode->i_sb->s_bdev;
+ sector_t sector = block << (inode->i_blkbits - 9);
+
+ might_sleep();
+ do {
+ void *addr;
+ unsigned long pfn;
+ long count;
+
+ count = bdev_direct_access(bdev, sector, &addr, &pfn, size);
+ if (count < 0)
+ return count;
+ BUG_ON(size < count);
+ while (count > 0) {
+ unsigned pgsz = PAGE_SIZE - offset_in_page(addr);
+ if (pgsz > count)
+ pgsz = count;
+ if (pgsz < PAGE_SIZE)
+ memset(addr, 0, pgsz);
+ else
+ clear_page(addr);
+ addr += pgsz;
+ size -= pgsz;
+ count -= pgsz;
+ BUG_ON(pgsz & 511);
+ sector += pgsz / 512;
+ cond_resched();
+ }
+ } while (size);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(dax_clear_blocks);
+
static long dax_get_addr(struct buffer_head *bh, void **addr, unsigned blkbits)
{
unsigned long pfn;
diff -puN fs/ext2/inode.c~daxext2-replace-ext2_clear_xip_target-with-dax_clear_blocks fs/ext2/inode.c
--- a/fs/ext2/inode.c~daxext2-replace-ext2_clear_xip_target-with-dax_clear_blocks
+++ a/fs/ext2/inode.c
@@ -733,10 +733,12 @@ static int ext2_get_blocks(struct inode
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;
diff -puN fs/ext2/xip.c~daxext2-replace-ext2_clear_xip_target-with-dax_clear_blocks fs/ext2/xip.c
--- a/fs/ext2/xip.c~daxext2-replace-ext2_clear_xip_target-with-dax_clear_blocks
+++ a/fs/ext2/xip.c
@@ -42,20 +42,6 @@ __ext2_get_block(struct inode *inode, pg
return rc;
}
-int
-ext2_clear_xip_target(struct inode *inode, sector_t block)
-{
- void *kaddr;
- unsigned long pfn;
- long size;
-
- size = __inode_direct_access(inode, block, &kaddr, &pfn, PAGE_SIZE);
- if (size < 0)
- return size;
- clear_page(kaddr);
- return 0;
-}
-
void ext2_xip_verify_sb(struct super_block *sb)
{
struct ext2_sb_info *sbi = EXT2_SB(sb);
diff -puN fs/ext2/xip.h~daxext2-replace-ext2_clear_xip_target-with-dax_clear_blocks fs/ext2/xip.h
--- a/fs/ext2/xip.h~daxext2-replace-ext2_clear_xip_target-with-dax_clear_blocks
+++ a/fs/ext2/xip.h
@@ -7,8 +7,6 @@
#ifdef CONFIG_EXT2_FS_XIP
extern void ext2_xip_verify_sb (struct super_block *);
-extern int ext2_clear_xip_target (struct inode *, sector_t);
-
static inline int ext2_use_xip (struct super_block *sb)
{
struct ext2_sb_info *sbi = EXT2_SB(sb);
@@ -19,6 +17,5 @@ int ext2_get_xip_mem(struct address_spac
#else
#define ext2_xip_verify_sb(sb) do { } while (0)
#define ext2_use_xip(sb) 0
-#define ext2_clear_xip_target(inode, chain) 0
#define ext2_get_xip_mem NULL
#endif
diff -puN include/linux/fs.h~daxext2-replace-ext2_clear_xip_target-with-dax_clear_blocks include/linux/fs.h
--- a/include/linux/fs.h~daxext2-replace-ext2_clear_xip_target-with-dax_clear_blocks
+++ a/include/linux/fs.h
@@ -2589,6 +2589,7 @@ extern int nonseekable_open(struct inode
ssize_t dax_do_io(int rw, struct kiocb *, struct inode *, struct iov_iter *,
loff_t, get_block_t, dio_iodone_t, int flags);
+int dax_clear_blocks(struct inode *, sector_t block, long size);
#ifdef CONFIG_FS_XIP
extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
_
Patches currently in -mm which might be from matthew.r.wilcox@xxxxxxxxx are
origin.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
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