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authorLinus Torvalds <torvalds@linux-foundation.org>2013-03-26 17:42:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-03-26 17:42:55 -0700
commitde55eb1d60d2ed0f1ba5e13226d91b3bfbe1c108 (patch)
tree8f2a62f811562b4008dd1cd50a0ebf5603b13a76 /fs/read_write.c
parentb175293ccc98ab84e93d25472d7422b4a897614b (diff)
parente8cd81693bbbb15db57d3c9aa7dd90eda4842874 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs fixes from Al Viro: "stable fodder; assorted deadlock fixes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: vt: synchronize_rcu() under spinlock is not nice... Nest rename_lock inside vfsmount_lock Don't bother with redoing rw_verify_area() from default_file_splice_from()
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index a698eff457fb..f7b5a23b804b 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -17,6 +17,7 @@
#include <linux/splice.h>
#include <linux/compat.h>
#include "read_write.h"
+#include "internal.h"
#include <asm/uaccess.h>
#include <asm/unistd.h>
@@ -417,6 +418,30 @@ ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, lof
EXPORT_SYMBOL(do_sync_write);
+ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos)
+{
+ mm_segment_t old_fs;
+ const char __user *p;
+ ssize_t ret;
+
+ old_fs = get_fs();
+ set_fs(get_ds());
+ p = (__force const char __user *)buf;
+ if (count > MAX_RW_COUNT)
+ count = MAX_RW_COUNT;
+ if (file->f_op->write)
+ ret = file->f_op->write(file, p, count, pos);
+ else
+ ret = do_sync_write(file, p, count, pos);
+ set_fs(old_fs);
+ if (ret > 0) {
+ fsnotify_modify(file);
+ add_wchar(current, ret);
+ }
+ inc_syscw(current);
+ return ret;
+}
+
ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
{
ssize_t ret;