[XFS] Disable the combination of XFS direct IO and AIO until the IO completion

handling for unwritten extents can be moved out of interrupt context.

SGI Modid: xfs-linux:xfs-kern:22343a

Signed-off-by: Nathan Scott <nathans@sgi.com>
Signed-off-by: Christoph Hellwig <hch@sgi.com>

2 files changed, 44 insertions, 2 deletions

diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c
index 9f057a4a5b06..d0d412afd261 100644
--- a/fs/xfs/linux-2.6/xfs_file.c
+++ b/fs/xfs/linux-2.6/xfs_file.c
@@ -515,10 +515,49 @@ open_exec_out:
 }
 #endif /* HAVE_FOP_OPEN_EXEC */
 
+/*
+ * Temporary workaround to the AIO direct IO write problem.
+ * This code can go and we can revert to do_sync_write once
+ * the writepage(s) rework is merged.
+ */
+STATIC ssize_t
+linvfs_write(
+        struct file     *filp,
+        const char      __user *buf,
+        size_t          len,
+        loff_t          *ppos)
+{
+        struct kiocb    kiocb;
+        ssize_t         ret;
+
+        init_sync_kiocb(&kiocb, filp);
+        kiocb.ki_pos = *ppos;
+        ret = __linvfs_write(&kiocb, buf, 0, len, kiocb.ki_pos);
+        *ppos = kiocb.ki_pos;
+        return ret;
+}
+STATIC ssize_t
+linvfs_write_invis(
+        struct file     *filp,
+        const char      __user *buf,
+        size_t          len,
+        loff_t          *ppos)
+{
+        struct kiocb    kiocb;
+        ssize_t         ret;
+
+        init_sync_kiocb(&kiocb, filp);
+        kiocb.ki_pos = *ppos;
+        ret = __linvfs_write(&kiocb, buf, IO_INVIS, len, kiocb.ki_pos);
+        *ppos = kiocb.ki_pos;
+        return ret;
+}
+
+
 struct file_operations linvfs_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = do_sync_read,
-        .write          = do_sync_write,
+        .write          = linvfs_write,
         .readv          = linvfs_readv,
         .writev         = linvfs_writev,
         .aio_read       = linvfs_aio_read,
@@ -540,7 +579,7 @@ struct file_operations linvfs_file_operations = {
 struct file_operations linvfs_invis_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = do_sync_read,
-        .write          = do_sync_write,
+        .write          = linvfs_write_invis,
         .readv          = linvfs_readv_invis,
         .writev         = linvfs_writev_invis,
         .aio_read       = linvfs_aio_read_invis,
diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c
index ff145fd0d1a4..aa9daaea6c34 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.c
+++ b/fs/xfs/linux-2.6/xfs_lrw.c
@@ -683,6 +683,9 @@ xfs_write(
                         (xip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
                                 mp->m_rtdev_targp : mp->m_ddev_targp;
 
+                if (ioflags & IO_ISAIO)
+                        return XFS_ERROR(-ENOSYS);
+
                 if ((pos & target->pbr_smask) || (count & target->pbr_smask))
                         return XFS_ERROR(-EINVAL);