diff options
| author | David S. Miller <davem@davemloft.net> | 2008-03-18 00:37:55 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-03-18 00:37:55 -0700 |
| commit | 577f99c1d08cf9cbdafd4e858dd13ff04d855090 (patch) | |
| tree | 0f726bbda9b18d311d4c95198bbd96cb7ac01db0 /mm/filemap.c | |
| parent | 26c0f03f6b77c513cb7bc37b73a06819bdbb791b (diff) | |
| parent | 2f633928cbba8a5858bb39b11e7219a41b0fbef5 (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
Conflicts:
drivers/net/wireless/rt2x00/rt2x00dev.c
net/8021q/vlan_dev.c
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 5c74b68935a..df343d1e634 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -28,7 +28,6 @@ #include <linux/backing-dev.h> #include <linux/pagevec.h> #include <linux/blkdev.h> -#include <linux/backing-dev.h> #include <linux/security.h> #include <linux/syscalls.h> #include <linux/cpuset.h> @@ -1743,21 +1742,27 @@ size_t iov_iter_copy_from_user(struct page *page, } EXPORT_SYMBOL(iov_iter_copy_from_user); -static void __iov_iter_advance_iov(struct iov_iter *i, size_t bytes) +void iov_iter_advance(struct iov_iter *i, size_t bytes) { + BUG_ON(i->count < bytes); + if (likely(i->nr_segs == 1)) { i->iov_offset += bytes; + i->count -= bytes; } else { const struct iovec *iov = i->iov; size_t base = i->iov_offset; /* * The !iov->iov_len check ensures we skip over unlikely - * zero-length segments. + * zero-length segments (without overruning the iovec). */ - while (bytes || !iov->iov_len) { - int copy = min(bytes, iov->iov_len - base); + while (bytes || unlikely(!iov->iov_len && i->count)) { + int copy; + copy = min(bytes, iov->iov_len - base); + BUG_ON(!i->count || i->count < copy); + i->count -= copy; bytes -= copy; base += copy; if (iov->iov_len == base) { @@ -1769,14 +1774,6 @@ static void __iov_iter_advance_iov(struct iov_iter *i, size_t bytes) i->iov_offset = base; } } - -void iov_iter_advance(struct iov_iter *i, size_t bytes) -{ - BUG_ON(i->count < bytes); - - __iov_iter_advance_iov(i, bytes); - i->count -= bytes; -} EXPORT_SYMBOL(iov_iter_advance); /* |