[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, 19 insertions, 37 deletions

diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.c b/fs/xfs/linux-2.6/xfs_ioctl32.c
index b34b3d8892a2..0504cece9f66 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl32.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl32.c
@@ -599,19 +599,24 @@ out:
         return error;
 }
 
-STATIC long
-xfs_compat_ioctl(
-        xfs_inode_t     *ip,
-        struct file     *filp,
-        int             ioflags,
-        unsigned        cmd,
-        void            __user *arg)
+long
+xfs_file_compat_ioctl(
+        struct file             *filp,
+        unsigned                cmd,
+        unsigned long           p)
 {
-        struct inode    *inode = filp->f_path.dentry->d_inode;
-        xfs_mount_t     *mp = ip->i_mount;
-        int             error;
+        struct inode            *inode = filp->f_path.dentry->d_inode;
+        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;
+
+        if (filp->f_mode & FMODE_NOCMTIME)
+                ioflags |= IO_INVIS;
+
+        xfs_itrace_entry(ip);
 
-        xfs_itrace_entry(XFS_I(inode));
         switch (cmd) {
         /* No size or alignment issues on any arch */
         case XFS_IOC_DIOINFO:
@@ -632,7 +637,7 @@ xfs_compat_ioctl(
         case XFS_IOC_GOINGDOWN:
         case XFS_IOC_ERROR_INJECTION:
         case XFS_IOC_ERROR_CLEARALL:
-                return xfs_ioctl(ip, filp, ioflags, cmd, arg);
+                return xfs_file_ioctl(filp, cmd, p);
 #ifndef BROKEN_X86_ALIGNMENT
         /* These are handled fine if no alignment issues */
         case XFS_IOC_ALLOCSP:
@@ -646,7 +651,7 @@ xfs_compat_ioctl(
         case XFS_IOC_FSGEOMETRY_V1:
         case XFS_IOC_FSGROWFSDATA:
         case XFS_IOC_FSGROWFSRT:
-                return xfs_ioctl(ip, filp, ioflags, cmd, arg);
+                return xfs_file_ioctl(filp, cmd, p);
 #else
         case XFS_IOC_ALLOCSP_32:
         case XFS_IOC_FREESP_32:
@@ -687,7 +692,7 @@ xfs_compat_ioctl(
         case XFS_IOC_SETXFLAGS_32:
         case XFS_IOC_GETVERSION_32:
                 cmd = _NATIVE_IOC(cmd, long);
-                return xfs_ioctl(ip, filp, ioflags, cmd, arg);
+                return xfs_file_ioctl(filp, cmd, p);
         case XFS_IOC_SWAPEXT: {
                 struct xfs_swapext        sxp;
                 struct compat_xfs_swapext __user *sxu = arg;
@@ -738,26 +743,3 @@ xfs_compat_ioctl(
                 return -XFS_ERROR(ENOIOCTLCMD);
         }
 }
-
-long
-xfs_file_compat_ioctl(
-        struct file             *filp,
-        unsigned int            cmd,
-        unsigned long           p)
-{
-        struct inode    *inode = filp->f_path.dentry->d_inode;
-
-        return xfs_compat_ioctl(XFS_I(inode), filp, 0, cmd, (void __user *)p);
-}
-
-long
-xfs_file_compat_invis_ioctl(
-        struct file             *filp,
-        unsigned int            cmd,
-        unsigned long           p)
-{
-        struct inode    *inode = filp->f_path.dentry->d_inode;
-
-        return xfs_compat_ioctl(XFS_I(inode), filp, IO_INVIS, cmd,
-                                (void __user *)p);
-}