1 files changed, 84 insertions, 0 deletions

diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c
index 69c98cf32336..2903faf6a26a 100644
--- a/fs/xfs/linux-2.6/xfs_iops.c
+++ b/fs/xfs/linux-2.6/xfs_iops.c
@@ -53,6 +53,7 @@
 #include <linux/namei.h>
 #include <linux/security.h>
 #include <linux/falloc.h>
+#include <linux/fiemap.h>
 
 /*
  * Bring the atime in the XFS inode uptodate.
@@ -661,6 +662,88 @@ out_error:
         return error;
 }
 
+#define XFS_FIEMAP_FLAGS        (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
+
+/*
+ * Call fiemap helper to fill in user data.
+ * Returns positive errors to xfs_getbmap.
+ */
+STATIC int
+xfs_fiemap_format(
+        void                    **arg,
+        struct getbmapx         *bmv,
+        int                     *full)
+{
+        int                     error;
+        struct fiemap_extent_info *fieinfo = *arg;
+        u32                     fiemap_flags = 0;
+        u64                     logical, physical, length;
+
+        /* Do nothing for a hole */
+        if (bmv->bmv_block == -1LL)
+                return 0;
+
+        logical = BBTOB(bmv->bmv_offset);
+        physical = BBTOB(bmv->bmv_block);
+        length = BBTOB(bmv->bmv_length);
+
+        if (bmv->bmv_oflags & BMV_OF_PREALLOC)
+                fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
+        else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
+                fiemap_flags |= FIEMAP_EXTENT_DELALLOC;
+                physical = 0;   /* no block yet */
+        }
+        if (bmv->bmv_oflags & BMV_OF_LAST)
+                fiemap_flags |= FIEMAP_EXTENT_LAST;
+
+        error = fiemap_fill_next_extent(fieinfo, logical, physical,
+                                        length, fiemap_flags);
+        if (error > 0) {
+                error = 0;
+                *full = 1;      /* user array now full */
+        }
+
+        return -error;
+}
+
+STATIC int
+xfs_vn_fiemap(
+        struct inode            *inode,
+        struct fiemap_extent_info *fieinfo,
+        u64                     start,
+        u64                     length)
+{
+        xfs_inode_t             *ip = XFS_I(inode);
+        struct getbmapx         bm;
+        int                     error;
+
+        error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
+        if (error)
+                return error;
+
+        /* Set up bmap header for xfs internal routine */
+        bm.bmv_offset = BTOBB(start);
+        /* Special case for whole file */
+        if (length == FIEMAP_MAX_OFFSET)
+                bm.bmv_length = -1LL;
+        else
+                bm.bmv_length = BTOBB(length);
+
+        /* our formatter will tell xfs_getbmap when to stop. */
+        bm.bmv_count = MAXEXTNUM;
+        bm.bmv_iflags = BMV_IF_PREALLOC;
+        if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
+                bm.bmv_iflags |= BMV_IF_ATTRFORK;
+        if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
+                bm.bmv_iflags |= BMV_IF_DELALLOC;
+
+        error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
+        if (error)
+                return -error;
+
+        return 0;
+}
+
 static const struct inode_operations xfs_inode_operations = {
         .permission             = xfs_vn_permission,
         .truncate               = xfs_vn_truncate,
@@ -671,6 +754,7 @@ static const struct inode_operations xfs_inode_operations = {
         .removexattr            = generic_removexattr,
         .listxattr              = xfs_vn_listxattr,
         .fallocate              = xfs_vn_fallocate,
+        .fiemap                 = xfs_vn_fiemap,
 };
 
 static const struct inode_operations xfs_dir_inode_operations = {