o Introduce extattr_{delete,get,set}_fd() to allow extended attribute

  operations on file descriptors, which complement the existing set of
  calls, extattr_{delete,get,set}_file() which act on paths.  In doing
  so, restructure the system call implementation such that the two sets
  of functions share most of the relevant code, rather than duplicating
  it.  This pushes the vnode locking into the shared code, but keeps
  the copying in of some arguments in the system call code.  Allowing
  access via file descriptors reduces the opportunity for race
  conditions when managing extended attributes.

Obtained from:	TrustedBSD Project

1 files changed, 13 insertions, 8 deletions

diff --git a/sys/sys/extattr.h b/sys/sys/extattr.h
index dbde540..d53ab03 100644
--- a/sys/sys/extattr.h
+++ b/sys/sys/extattr.h
@@ -57,14 +57,19 @@
 struct iovec;
 
 __BEGIN_DECLS
-int	extattrctl(const char *path, int cmd, const char *filename,
-	    int attrnamespace, const char *attrname);
-int	extattr_delete_file(const char *path, int attrnamespace,
-	    const char *attrname);
-int	extattr_get_file(const char *path, int attrnamespace,
-	    const char *attrname, struct iovec *iovp, unsigned iovcnt);
-int	extattr_set_file(const char *path, int attrnamespace,
-	    const char *attrname, struct iovec *iovp, unsigned iovcnt);
+int	extattrctl(const char *_path, int _cmd, const char *_filename,
+	    int _attrnamespace, const char *_attrname);
+int	extattr_delete_fd(int _fd, int _attrnamespace, const char *_attrname);
+int	extattr_delete_file(const char *_path, int _attrnamespace,
+	    const char *_attrname);
+int	extattr_get_fd(int _fd, int _attrnamespace, const char *_attrname,
+	    struct iovec *_iovp, unsigned _iovcnt);
+int	extattr_get_file(const char *_path, int _attrnamespace,
+	    const char *_attrname, struct iovec *_iovp, unsigned _iovcnt);
+int	extattr_set_fd(int _fd, int _attrnamespace, const char *_attrname,
+	    struct iovec *_iovp, unsigned _iovcnt);
+int	extattr_set_file(const char *_path, int _attrnamespace,
+	    const char *_attrname, struct iovec *_iovp, unsigned _iovcnt);
 __END_DECLS
 
 #endif /* !_KERNEL */