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authorNick Piggin <npiggin@suse.de>2007-10-16 01:24:59 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:55 -0700
commit2f718ffc16c43a435d12919c75dbfad518abd056 (patch)
tree55588cb2815d844e9d0b2404cf8ceafe98b5c55d /mm/filemap.h
parent08291429cfa6258c4cd95d8833beb40f828b194e (diff)
downloadop-kernel-dev-2f718ffc16c43a435d12919c75dbfad518abd056.zip
op-kernel-dev-2f718ffc16c43a435d12919c75dbfad518abd056.tar.gz
mm: buffered write iterator
Add an iterator data structure to operate over an iovec. Add usercopy operators needed by generic_file_buffered_write, and convert that function over. 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.h')
-rw-r--r--mm/filemap.h103
1 files changed, 0 insertions, 103 deletions
diff --git a/mm/filemap.h b/mm/filemap.h
deleted file mode 100644
index b500d93..0000000
--- a/mm/filemap.h
+++ /dev/null
@@ -1,103 +0,0 @@
-/*
- * linux/mm/filemap.h
- *
- * Copyright (C) 1994-1999 Linus Torvalds
- */
-
-#ifndef __FILEMAP_H
-#define __FILEMAP_H
-
-#include <linux/types.h>
-#include <linux/fs.h>
-#include <linux/mm.h>
-#include <linux/highmem.h>
-#include <linux/uio.h>
-#include <linux/uaccess.h>
-
-size_t
-__filemap_copy_from_user_iovec_inatomic(char *vaddr,
- const struct iovec *iov,
- size_t base,
- size_t bytes);
-
-/*
- * Copy as much as we can into the page and return the number of bytes which
- * were sucessfully copied. If a fault is encountered then return the number of
- * bytes which were copied.
- */
-static inline size_t
-filemap_copy_from_user_atomic(struct page *page, unsigned long offset,
- const struct iovec *iov, unsigned long nr_segs,
- size_t base, size_t bytes)
-{
- char *kaddr;
- size_t copied;
-
- kaddr = kmap_atomic(page, KM_USER0);
- if (likely(nr_segs == 1)) {
- int left;
- char __user *buf = iov->iov_base + base;
- left = __copy_from_user_inatomic_nocache(kaddr + offset,
- buf, bytes);
- copied = bytes - left;
- } else {
- copied = __filemap_copy_from_user_iovec_inatomic(kaddr + offset,
- iov, base, bytes);
- }
- kunmap_atomic(kaddr, KM_USER0);
-
- return copied;
-}
-
-/*
- * This has the same sideeffects and return value as
- * filemap_copy_from_user_atomic().
- * The difference is that it attempts to resolve faults.
- */
-static inline size_t
-filemap_copy_from_user(struct page *page, unsigned long offset,
- const struct iovec *iov, unsigned long nr_segs,
- size_t base, size_t bytes)
-{
- char *kaddr;
- size_t copied;
-
- kaddr = kmap(page);
- if (likely(nr_segs == 1)) {
- int left;
- char __user *buf = iov->iov_base + base;
- left = __copy_from_user_nocache(kaddr + offset, buf, bytes);
- copied = bytes - left;
- } else {
- copied = __filemap_copy_from_user_iovec_inatomic(kaddr + offset,
- iov, base, bytes);
- }
- kunmap(page);
- return copied;
-}
-
-static inline void
-filemap_set_next_iovec(const struct iovec **iovp, unsigned long nr_segs,
- size_t *basep, size_t bytes)
-{
- if (likely(nr_segs == 1)) {
- *basep += bytes;
- } else {
- const struct iovec *iov = *iovp;
- size_t base = *basep;
-
- while (bytes) {
- int copy = min(bytes, iov->iov_len - base);
-
- bytes -= copy;
- base += copy;
- if (iov->iov_len == base) {
- iov++;
- base = 0;
- }
- }
- *iovp = iov;
- *basep = base;
- }
-}
-#endif
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