Move the call to vmtruncate to get rid of accessive blocks to the only
remaining caller and rename the non-truncating version to nobh_write_begin.
Get rid of the superflous file argument to it while we're at it.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Index: linux-2.6/fs/buffer.c
===================================================================
--- linux-2.6.orig/fs/buffer.c 2010-05-30 22:28:16.571004834 +0200
+++ linux-2.6/fs/buffer.c 2010-05-30 22:30:49.341024320 +0200
@@ -2510,11 +2510,11 @@ static void attach_nobh_buffers(struct p
}
/*
- * Filesystems implementing the new truncate sequence should use the
- * _newtrunc postfix variant which won't incorrectly call vmtruncate.
+ * On entry, the page is fully not uptodate.
+ * On exit the page is fully uptodate in the areas outside (from,to)
* The filesystem needs to handle block truncation upon failure.
*/
-int nobh_write_begin_newtrunc(struct file *file, struct address_space *mapping,
+int nobh_write_begin(struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata,
get_block_t *get_block)
@@ -2547,7 +2547,7 @@ int nobh_write_begin_newtrunc(struct fil
unlock_page(page);
page_cache_release(page);
*pagep = NULL;
- return block_write_begin_newtrunc(file, mapping, pos, len,
+ return block_write_begin_newtrunc(NULL, mapping, pos, len,
flags, pagep, fsdata, get_block);
}
@@ -2654,35 +2654,6 @@ out_release:
return ret;
}
-EXPORT_SYMBOL(nobh_write_begin_newtrunc);
-
-/*
- * On entry, the page is fully not uptodate.
- * On exit the page is fully uptodate in the areas outside (from,to)
- */
-int nobh_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
- struct page **pagep, void **fsdata,
- get_block_t *get_block)
-{
- int ret;
-
- ret = nobh_write_begin_newtrunc(file, mapping, pos, len, flags,
- pagep, fsdata, get_block);
-
- /*
- * prepare_write() may have instantiated a few blocks
- * outside i_size. Trim these off again. Don't need
- * i_size_read because we hold i_mutex.
- */
- if (unlikely(ret)) {
- loff_t isize = mapping->host->i_size;
- if (pos + len > isize)
- vmtruncate(mapping->host, isize);
- }
-
- return ret;
-}
EXPORT_SYMBOL(nobh_write_begin);
int nobh_write_end(struct file *file, struct address_space *mapping,
Index: linux-2.6/fs/ext2/inode.c
===================================================================
--- linux-2.6.orig/fs/ext2/inode.c 2010-05-30 22:28:18.670254589 +0200
+++ linux-2.6/fs/ext2/inode.c 2010-05-30 22:30:49.342022505 +0200
@@ -806,13 +806,8 @@ ext2_nobh_write_begin(struct file *file,
{
int ret;
- /*
- * Dir-in-pagecache still uses ext2_write_begin. Would have to rework
- * directory handling code to pass around offsets rather than struct
- * pages in order to make this work easily.
- */
- ret = nobh_write_begin_newtrunc(file, mapping, pos, len, flags, pagep,
- fsdata, ext2_get_block);
+ ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
+ ext2_get_block);
if (ret < 0)
ext2_write_failed(mapping, pos + len);
return ret;
Index: linux-2.6/fs/jfs/inode.c
===================================================================
--- linux-2.6.orig/fs/jfs/inode.c 2010-05-30 22:28:18.696254170 +0200
+++ linux-2.6/fs/jfs/inode.c 2010-05-30 22:30:49.547300686 +0200
@@ -303,8 +303,17 @@ static int jfs_write_begin(struct file *
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
- return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
+ int ret;
+
+ ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
jfs_get_block);
+ if (unlikely(ret)) {
+ loff_t isize = mapping->host->i_size;
+ if (pos + len > isize)
+ vmtruncate(mapping->host, isize);
+ }
+
+ return ret;
}
static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
Index: linux-2.6/include/linux/buffer_head.h
===================================================================
--- linux-2.6.orig/include/linux/buffer_head.h 2010-05-30 22:28:16.601004276 +0200
+++ linux-2.6/include/linux/buffer_head.h 2010-05-30 22:30:49.611005673 +0200
@@ -231,11 +231,7 @@ void block_sync_page(struct page *);
sector_t generic_block_bmap(struct address_space *, sector_t, get_block_t *);
int block_truncate_page(struct address_space *, loff_t, get_block_t *);
int file_fsync(struct file *, int);
-int nobh_write_begin_newtrunc(struct file *, struct address_space *,
- loff_t, unsigned, unsigned,
- struct page **, void **, get_block_t*);
-int nobh_write_begin(struct file *, struct address_space *,
- loff_t, unsigned, unsigned,
+int nobh_write_begin(struct address_space *, loff_t, unsigned, unsigned,
struct page **, void **, get_block_t*);
int nobh_write_end(struct file *, struct address_space *,
loff_t, unsigned, unsigned,
--
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