diff options
| author | Nick Piggin <npiggin@suse.de> | 2007-10-16 01:24:58 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:42:54 -0700 |
| commit | 4a9e5ef1f4f15205e477817a5cefc34bd3f65f55 (patch) | |
| tree | 51f52086ecbccc3f41955d8d12293ef7a566a05b /mm/filemap_xip.c | |
| parent | eb2be189317d031895b5ca534fbf735eb546158b (diff) | |
| download | lwn-4a9e5ef1f4f15205e477817a5cefc34bd3f65f55.tar.gz lwn-4a9e5ef1f4f15205e477817a5cefc34bd3f65f55.zip | |
mm: write iovec cleanup
Hide some of the open-coded nr_segs tests into the iovec helpers. This is all
to simplify generic_file_buffered_write, because that gets more complex in the
next patch.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/filemap_xip.c')
| -rw-r--r-- | mm/filemap_xip.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c index 53ee6a299635..32132f3cd641 100644 --- a/mm/filemap_xip.c +++ b/mm/filemap_xip.c @@ -15,7 +15,6 @@ #include <linux/rmap.h> #include <linux/sched.h> #include <asm/tlbflush.h> -#include "filemap.h" /* * We do use our own empty page to avoid interference with other users @@ -288,6 +287,7 @@ __xip_file_write(struct file *filp, const char __user *buf, unsigned long index; unsigned long offset; size_t copied; + char *kaddr; offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */ index = pos >> PAGE_CACHE_SHIFT; @@ -295,14 +295,6 @@ __xip_file_write(struct file *filp, const char __user *buf, if (bytes > count) bytes = count; - /* - * Bring in the user page that we will copy from _first_. - * Otherwise there's a nasty deadlock on copying from the - * same page as we're writing to, without it being marked - * up-to-date. - */ - fault_in_pages_readable(buf, bytes); - page = a_ops->get_xip_page(mapping, index*(PAGE_SIZE/512), 0); if (IS_ERR(page) && (PTR_ERR(page) == -ENODATA)) { @@ -319,8 +311,13 @@ __xip_file_write(struct file *filp, const char __user *buf, break; } - copied = filemap_copy_from_user(page, offset, buf, bytes); + fault_in_pages_readable(buf, bytes); + kaddr = kmap_atomic(page, KM_USER0); + copied = bytes - + __copy_from_user_inatomic_nocache(kaddr, buf, bytes); + kunmap_atomic(kaddr, KM_USER0); flush_dcache_page(page); + if (likely(copied > 0)) { status = copied; |