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authorAl Viro <viro@zeniv.linux.org.uk>2013-03-20 13:19:30 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-03-21 13:11:11 -0400
commit06ae43f34bcc07a0b6be8bf78a1c895bcd12c839 (patch)
treeb74fe0c7e9370dfed956a1607dd10282c9ba1096 /fs/internal.h
parentf6161aa153581da4a3867a2d1a7caf4be19b6ec9 (diff)
downloadlinux-06ae43f34bcc07a0b6be8bf78a1c895bcd12c839.tar.bz2
Don't bother with redoing rw_verify_area() from default_file_splice_from()
default_file_splice_from() ends up calling vfs_write() (via very convoluted callchain). It's an overkill, since we already have done rw_verify_area() in the caller by the time we call vfs_write() we are under set_fs(KERNEL_DS), so access_ok() is also pointless. Add a new helper (__kernel_write()), use it instead of kernel_write() in there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/internal.h')
-rw-r--r--fs/internal.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/internal.h b/fs/internal.h
index 507141fceb99..4be78237d896 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -125,3 +125,8 @@ extern int invalidate_inodes(struct super_block *, bool);
* dcache.c
*/
extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
+
+/*
+ * read_write.c
+ */
+extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);