commit 2ab4992be86b56d602628a3065b5a679cde02327
Author: Erez Zadok <[EMAIL PROTECTED]>
Date: Sun Nov 25 18:32:31 2007 -0500
Unionfs: support splice(2)
Also remove redundant variable from unionfs_readpage (saves a bit on stack
space).
Signed-off-by: Erez Zadok <[EMAIL PROTECTED]>
diff --git a/fs/unionfs/mmap.c b/fs/unionfs/mmap.c
index ba05bf0..bfd2cad 100644
--- a/fs/unionfs/mmap.c
+++ b/fs/unionfs/mmap.c
@@ -179,7 +179,7 @@ static int unionfs_readpage(struct file *file, struct page
*page)
struct inode *inode;
mm_segment_t old_fs;
char *page_data = NULL;
- loff_t offset;
+ mode_t orig_mode;
unionfs_read_lock(file->f_path.dentry->d_sb);
err = unionfs_file_revalidate(file, false);
@@ -207,11 +207,17 @@ static int unionfs_readpage(struct file *file, struct
page *page)
* the necessary magic for us.
*/
lower_file->f_pos = page_offset(page);
- offset = page_offset(page);
old_fs = get_fs();
set_fs(KERNEL_DS);
+ /*
+ * generic_file_splice_write may call us on a file not opened for
+ * reading, so temporarily allow reading.
+ */
+ orig_mode = lower_file->f_mode;
+ lower_file->f_mode |= FMODE_READ;
err = vfs_read(lower_file, page_data, PAGE_CACHE_SIZE,
&lower_file->f_pos);
+ lower_file->f_mode = orig_mode;
set_fs(old_fs);
if (err >= 0 && err < PAGE_CACHE_SIZE)
memset(page_data + err, 0, PAGE_CACHE_SIZE - err);
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