splice: introduce FMODE_SPLICE_READ and FMODE_SPLICE_WRITE
Introduce FMODE_SPLICE_READ and FMODE_SPLICE_WRITE. These modes check
whether it is legal to read or write a file using splice. Both get
automatically set on regular files and are not checked when a 'struct
fileoperations' includes the splice_{read,write} methods.
Change-Id: Ice6a3fab20bf0ac131f8d908f4bb0f7dc34bf4e3
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
diff --git a/fs/open.c b/fs/open.c
index 56c8810..4f4568f 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -679,6 +679,10 @@
return f;
}
+ if (S_ISREG(inode->i_mode))
+ f->f_mode |= FMODE_SPLICE_WRITE | FMODE_SPLICE_READ;
+
+
f->f_op = fops_get(inode->i_fop);
error = security_dentry_open(f, cred);