[XFS] add a FMODE flag to make XFS invisible I/O less hacky

XFS has a mode called invisble I/O that doesn't update any of the
timestamps.  It's used for HSM-style applications and exposed through
the nasty open by handle ioctl.

Instead of doing directly assignment of file operations that set an
internal flag for it add a new FMODE_NOCMTIME flag that we can check
in the normal file operations.

(addition of the generic VFS flag has been ACKed by Al as an interims
 solution)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

1 files changed, 20 insertions, 9 deletions

diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c
index c8f1e632ba94..0264c8719ffd 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl.c
@@ -319,10 +319,11 @@ xfs_open_by_handle(
                 put_unused_fd(new_fd);
                 return -XFS_ERROR(-PTR_ERR(filp));
         }
+
         if (inode->i_mode & S_IFREG) {
                 /* invisible operation should not change atime */
                 filp->f_flags |= O_NOATIME;
-                filp->f_op = &xfs_invis_file_operations;
+                filp->f_mode |= FMODE_NOCMTIME;
         }
 
         fd_install(new_fd, filp);
@@ -1328,21 +1329,31 @@ xfs_ioc_getbmapx(
         return 0;
 }
 
-int
-xfs_ioctl(
-        xfs_inode_t             *ip,
+/*
+ * Note: some of the ioctl's return positive numbers as a
+ * byte count indicating success, such as readlink_by_handle.
+ * So we don't "sign flip" like most other routines.  This means
+ * true errors need to be returned as a negative value.
+ */
+long
+xfs_file_ioctl(
         struct file             *filp,
-        int                     ioflags,
         unsigned int            cmd,
-        void                    __user *arg)
+        unsigned long           p)
 {
         struct inode            *inode = filp->f_path.dentry->d_inode;
-        xfs_mount_t             *mp = ip->i_mount;
+        struct xfs_inode        *ip = XFS_I(inode);
+        struct xfs_mount        *mp = ip->i_mount;
+        void                    __user *arg = (void __user *)p;
+        int                     ioflags = 0;
         int                     error;
 
-        xfs_itrace_entry(XFS_I(inode));
-        switch (cmd) {
+        if (filp->f_mode & FMODE_NOCMTIME)
+                ioflags |= IO_INVIS;
 
+        xfs_itrace_entry(ip);
+
+        switch (cmd) {
         case XFS_IOC_ALLOCSP:
         case XFS_IOC_FREESP:
         case XFS_IOC_RESVSP: