Part I: Update extended attribute API and ABI:

o Modify the system call syntax for extattr_{get,set}_{fd,file}() so
  as not to use the scatter gather API (which appeared not to be used
  by any consumers, and be less portable), rather, accepts 'data'
  and 'nbytes' in the style of other simple read/write interfaces.
  This changes the API and ABI.

o Modify system call semantics so that extattr_get_{fd,file}() return
  a size_t.  When performing a read, the number of bytes read will
  be returned, unless the data pointer is NULL, in which case the
  number of bytes of data are returned.  This changes the API only.

o Modify the VOP_GETEXTATTR() vnode operation to accept a *size_t
  argument so as to return the size, if desirable.  If set to NULL,
  the size will not be returned.

o Update various filesystems (pseodofs, ufs) to DTRT.

These changes should make extended attributes more useful and more
portable.  More commits to rebuild the system call files, as well
as update userland utilities to follow.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs

1 files changed, 6 insertions, 6 deletions

diff --git a/sys/sys/extattr.h b/sys/sys/extattr.h
index bca21bd..2d65624 100644
--- a/sys/sys/extattr.h
+++ b/sys/sys/extattr.h
@@ -55,14 +55,14 @@ int	extattrctl(const char *_path, int _cmd, const char *_filename,
 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);
+ssize_t	extattr_get_fd(int _fd, int _attrnamespace, const char *_attrname,
+	    void *_data, size_t _nbytes);
+ssize_t	extattr_get_file(const char *_path, int _attrnamespace,
+	    const char *_attrname, void *_data, size_t _nbytes);
 int	extattr_set_fd(int _fd, int _attrnamespace, const char *_attrname,
-	    struct iovec *_iovp, unsigned _iovcnt);
+	    const void *_data, size_t _nbytes);
 int	extattr_set_file(const char *_path, int _attrnamespace,
-	    const char *_attrname, struct iovec *_iovp, unsigned _iovcnt);
+	    const char *_attrname, const void *_data, size_t _nbytes);
 __END_DECLS
 
 #endif /* !_KERNEL */