The patch titled
Subject: dax,ext2: replace xip_truncate_page with dax_truncate_page
has been removed from the -mm tree. Its filename was
daxext2-replace-xip_truncate_page-with-dax_truncate_page.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 xip_truncate_page with dax_truncate_page
It takes a get_block parameter just like nobh_truncate_page() and
block_truncate_page()
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
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: 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 | 44 +++++++++++++++++++++++++++++++++++++++++++
fs/ext2/inode.c | 2 -
include/linux/fs.h | 10 ---------
mm/filemap_xip.c | 40 ---------------------------------------
4 files changed, 46 insertions(+), 50 deletions(-)
diff -puN fs/dax.c~daxext2-replace-xip_truncate_page-with-dax_truncate_page fs/dax.c
--- a/fs/dax.c~daxext2-replace-xip_truncate_page-with-dax_truncate_page
+++ a/fs/dax.c
@@ -462,3 +462,47 @@ int dax_fault(struct vm_area_struct *vma
return result;
}
EXPORT_SYMBOL_GPL(dax_fault);
+
+/**
+ * dax_truncate_page - handle a partial page being truncated in a DAX file
+ * @inode: The file being truncated
+ * @from: The file offset that is being truncated to
+ * @get_block: The filesystem method used to translate file offsets to blocks
+ *
+ * Similar to block_truncate_page(), this function can be called by a
+ * filesystem when it is truncating an DAX file to handle the partial page.
+ *
+ * We work in terms of PAGE_CACHE_SIZE here for commonality with
+ * block_truncate_page(), but we could go down to PAGE_SIZE if the filesystem
+ * took care of disposing of the unnecessary blocks. Even if the filesystem
+ * block size is smaller than PAGE_SIZE, we have to zero the rest of the page
+ * since the file might be mmaped.
+ */
+int dax_truncate_page(struct inode *inode, loff_t from, get_block_t get_block)
+{
+ struct buffer_head bh;
+ pgoff_t index = from >> PAGE_CACHE_SHIFT;
+ unsigned offset = from & (PAGE_CACHE_SIZE-1);
+ unsigned length = PAGE_CACHE_ALIGN(from) - from;
+ int err;
+
+ /* Block boundary? Nothing to do */
+ if (!length)
+ return 0;
+
+ memset(&bh, 0, sizeof(bh));
+ bh.b_size = PAGE_CACHE_SIZE;
+ err = get_block(inode, index, &bh, 0);
+ if (err < 0)
+ return err;
+ if (buffer_written(&bh)) {
+ void *addr;
+ err = dax_get_addr(&bh, &addr, inode->i_blkbits);
+ if (err < 0)
+ return err;
+ memset(addr + offset, 0, length);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(dax_truncate_page);
diff -puN fs/ext2/inode.c~daxext2-replace-xip_truncate_page-with-dax_truncate_page fs/ext2/inode.c
--- a/fs/ext2/inode.c~daxext2-replace-xip_truncate_page-with-dax_truncate_page
+++ a/fs/ext2/inode.c
@@ -1210,7 +1210,7 @@ static int ext2_setsize(struct inode *in
inode_dio_wait(inode);
if (IS_DAX(inode))
- error = xip_truncate_page(inode->i_mapping, newsize);
+ 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);
diff -puN include/linux/fs.h~daxext2-replace-xip_truncate_page-with-dax_truncate_page include/linux/fs.h
--- a/include/linux/fs.h~daxext2-replace-xip_truncate_page-with-dax_truncate_page
+++ a/include/linux/fs.h
@@ -2591,18 +2591,10 @@ 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);
+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);
#define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb)
-#ifdef CONFIG_FS_XIP
-extern int xip_truncate_page(struct address_space *mapping, loff_t from);
-#else
-static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
-{
- return 0;
-}
-#endif
-
#ifdef CONFIG_BLOCK
typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
loff_t file_offset);
diff -puN mm/filemap_xip.c~daxext2-replace-xip_truncate_page-with-dax_truncate_page mm/filemap_xip.c
--- a/mm/filemap_xip.c~daxext2-replace-xip_truncate_page-with-dax_truncate_page
+++ a/mm/filemap_xip.c
@@ -22,43 +22,3 @@
#include <asm/tlbflush.h>
#include <asm/io.h>
-/*
- * truncate a page used for execute in place
- * functionality is analog to block_truncate_page but does use get_xip_mem
- * to get the page instead of page cache
- */
-int
-xip_truncate_page(struct address_space *mapping, loff_t from)
-{
- pgoff_t index = from >> PAGE_CACHE_SHIFT;
- unsigned offset = from & (PAGE_CACHE_SIZE-1);
- unsigned blocksize;
- unsigned length;
- void *xip_mem;
- unsigned long xip_pfn;
- int err;
-
- BUG_ON(!mapping->a_ops->get_xip_mem);
-
- blocksize = 1 << mapping->host->i_blkbits;
- length = offset & (blocksize - 1);
-
- /* Block boundary? Nothing to do */
- if (!length)
- return 0;
-
- length = blocksize - length;
-
- err = mapping->a_ops->get_xip_mem(mapping, index, 0,
- &xip_mem, &xip_pfn);
- if (unlikely(err)) {
- if (err == -ENODATA)
- /* Hole? No need to truncate */
- return 0;
- else
- return err;
- }
- memset(xip_mem + offset, 0, length);
- return 0;
-}
-EXPORT_SYMBOL_GPL(xip_truncate_page);
_
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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