Hi,
Here is the patch to pass size of the remaining IO to batch_write()
interface.
I would like to use it ext3/ext4 to allocate in chunks. Currently its
passing
only the size of the current buffer (in the vector entry).
Comments ? Flames ? Looks reasonable ?
Thanks,
Badari
Pass remaining size of this IO to batch_write(). This
way filesystems could choose to allocate for the entire IO,
instead of current buffer size.
I would like to use this for setting ext3 reservation window
or allocating entire extent (ext4).
Signed-off-by: Badari Pulavarty <[email protected]>
---
include/linux/fs.h | 2 ++
mm/filemap.c | 1 +
2 files changed, 3 insertions(+)
Index: linux-2.6.18-rc1/include/linux/fs.h
===================================================================
--- linux-2.6.18-rc1.orig/include/linux/fs.h 2006-07-24 10:12:18.000000000 -0700
+++ linux-2.6.18-rc1/include/linux/fs.h 2006-07-24 10:35:51.000000000 -0700
@@ -356,6 +356,7 @@ struct writeback_control;
* struct write_descriptor - set of write arguments
* @pos: offset from the start of the file to write to
* @count: number of bytes to write
+ * @iosize: remaining number of bytes in the IO
* @buf: pointer to data to be written
* @lru_pvec: multipage container to batch adding pages to LRU list
* @cached_page: allocated but not used on previous call
@@ -366,6 +367,7 @@ struct writeback_control;
struct write_descriptor {
loff_t pos;
size_t count;
+ size_t iosize;
char __user *buf;
struct page *cached_page;
struct pagevec *lru_pvec;
Index: linux-2.6.18-rc1/mm/filemap.c
===================================================================
--- linux-2.6.18-rc1.orig/mm/filemap.c 2006-07-24 10:12:20.000000000 -0700
+++ linux-2.6.18-rc1/mm/filemap.c 2006-07-24 10:36:44.000000000 -0700
@@ -2278,6 +2278,7 @@ generic_file_buffered_write(struct kiocb
do {
/* do not walk over current segment */
desc.buf = cur_iov->iov_base + iov_base;
+ desc.iosize = count;
desc.count = min(count, cur_iov->iov_len - iov_base);
if (desc.count > 0)
status = (*batch_write)(file, &desc, &copied);
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
