[PATCH] kill BMAPI_UNWRITTEN

[Christoph Hellwig <hch@xxxxxx>]

There is no reason to go through xfs_iomap for the BMAPI_UNWRITTEN
because it has nothing in common with the other cases.  Instead
check for the shutdown filesystem in xfs_end_bio_unwritten and perform
a direct call to xfs_iomap_write_unwritten (which should be renamed
to something more sensible one day)


Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Index: linux-2.6-xfs/fs/xfs/linux-2.6/xfs_aops.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/linux-2.6/xfs_aops.c      2007-09-06 
10:18:05.000000000 +0200
+++ linux-2.6-xfs/fs/xfs/linux-2.6/xfs_aops.c   2007-09-06 10:18:05.000000000 
+0200
@@ -237,12 +237,13 @@ xfs_end_bio_unwritten(
 {
        xfs_ioend_t             *ioend =
                container_of(work, xfs_ioend_t, io_work);
+       struct xfs_inode        *ip = XFS_I(ioend->io_inode);
        xfs_off_t               offset = ioend->io_offset;
        size_t                  size = ioend->io_size;
 
        if (likely(!ioend->io_error)) {
-               xfs_bmap(XFS_I(ioend->io_inode), offset, size,
-                               BMAPI_UNWRITTEN, NULL, NULL);
+               if (!XFS_FORCED_SHUTDOWN(ip->i_mount))
+                       xfs_iomap_write_unwritten(ip, offset, size);
                xfs_setfilesize(ioend);
        }
        xfs_destroy_ioend(ioend);
Index: linux-2.6-xfs/fs/xfs/xfs_iomap.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_iomap.c       2007-09-06 10:18:05.000000000 
+0200
+++ linux-2.6-xfs/fs/xfs/xfs_iomap.c    2007-09-06 10:18:05.000000000 +0200
@@ -191,9 +191,7 @@ xfs_iomap(
        if (XFS_FORCED_SHUTDOWN(mp))
                return XFS_ERROR(EIO);
 
-       switch (flags &
-               (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE |
-                BMAPI_UNWRITTEN)) {
+       switch (flags & (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE)) {
        case BMAPI_READ:
                xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count);
                lockmode = XFS_LCK_MAP_SHARED(mp, io);
@@ -218,8 +216,6 @@ xfs_iomap(
                        XFS_ILOCK(mp, io, lockmode);
                }
                break;
-       case BMAPI_UNWRITTEN:
-               goto phase2;
        default:
                BUG();
        }
@@ -238,8 +234,7 @@ xfs_iomap(
        if (error)
                goto out;
 
-phase2:
-       switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) {
+       switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE)) {
        case BMAPI_WRITE:
                /* If we found an extent, return it */
                if (nimaps &&
@@ -277,11 +272,6 @@ phase2:
                error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count,
                                                 &imap, &nimaps);
                break;
-       case BMAPI_UNWRITTEN:
-               lockmode = 0;
-               error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count);
-               nimaps = 0;
-               break;
        }
 
        if (nimaps) {
Index: linux-2.6-xfs/fs/xfs/xfs_iomap.h
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_iomap.h       2007-09-06 10:18:05.000000000 
+0200
+++ linux-2.6-xfs/fs/xfs/xfs_iomap.h    2007-09-06 10:18:05.000000000 +0200
@@ -36,7 +36,6 @@ typedef enum {
        BMAPI_READ = (1 << 0),          /* read extents */
        BMAPI_WRITE = (1 << 1),         /* create extents */
        BMAPI_ALLOCATE = (1 << 2),      /* delayed allocate to real extents */
-       BMAPI_UNWRITTEN  = (1 << 3),    /* unwritten extents to real extents */
        /* modifiers */
        BMAPI_IGNSTATE = (1 << 4),      /* ignore unwritten state on read */
        BMAPI_DIRECT = (1 << 5),        /* direct instead of buffered write */