xfs: drop dmapi hooks

Dmapi support was never merged upstream, but we still have a lot of hooks
bloating XFS for it, all over the fast pathes of the filesystem.

This patch drops over 700 lines of dmapi overhead.  If we'll ever get HSM
support in mainline at least the namespace events can be done much saner
in the VFS instead of the individual filesystem, so it's not like this
is much help for future work.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

1 files changed, 0 insertions, 23 deletions

diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index 99587ded043f..9db1418a64bf 100644
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -34,7 +34,6 @@
 #include "xfs_dinode.h"
 #include "xfs_inode.h"
 #include "xfs_btree.h"
-#include "xfs_dmapi.h"
 #include "xfs_mount.h"
 #include "xfs_ialloc.h"
 #include "xfs_itable.h"
@@ -5605,28 +5604,6 @@ xfs_getbmap(
                 prealloced = 0;
                 fixlen = 1LL << 32;
         } else {
-                /*
-                 * If the BMV_IF_NO_DMAPI_READ interface bit specified, do
-                 * not generate a DMAPI read event.  Otherwise, if the
-                 * DM_EVENT_READ bit is set for the file, generate a read
-                 * event in order that the DMAPI application may do its thing
-                 * before we return the extents.  Usually this means restoring
-                 * user file data to regions of the file that look like holes.
-                 *
-                 * The "old behavior" (from XFS_IOC_GETBMAP) is to not specify
-                 * BMV_IF_NO_DMAPI_READ so that read events are generated.
-                 * If this were not true, callers of ioctl(XFS_IOC_GETBMAP)
-                 * could misinterpret holes in a DMAPI file as true holes,
-                 * when in fact they may represent offline user data.
-                 */
-                if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) &&
-                    !(iflags & BMV_IF_NO_DMAPI_READ)) {
-                        error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip,
-                                              0, 0, 0, NULL);
-                        if (error)
-                                return XFS_ERROR(error);
-                }
-
                 if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
                     ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
                     ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)