xfs: implement the GETFSMAP ioctl
Introduce a new ioctl that uses the reverse mapping btree to return
information about the physical layout of the filesystem.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index b72dc82..095bdf0 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -92,6 +92,18 @@ struct getbmapx {
#define BMV_OF_LAST 0x4 /* segment is the last in the file */
#define BMV_OF_SHARED 0x8 /* segment shared with another file */
+/* fmr_owner special values for FS_IOC_GETFSMAP */
+#define XFS_FMR_OWN_FREE FMR_OWN_FREE /* free space */
+#define XFS_FMR_OWN_UNKNOWN FMR_OWN_UNKNOWN /* unknown owner */
+#define XFS_FMR_OWN_FS FMR_OWNER('X', 1) /* static fs metadata */
+#define XFS_FMR_OWN_LOG FMR_OWNER('X', 2) /* journalling log */
+#define XFS_FMR_OWN_AG FMR_OWNER('X', 3) /* per-AG metadata */
+#define XFS_FMR_OWN_INOBT FMR_OWNER('X', 4) /* inode btree blocks */
+#define XFS_FMR_OWN_INODES FMR_OWNER('X', 5) /* inodes */
+#define XFS_FMR_OWN_REFC FMR_OWNER('X', 6) /* refcount tree */
+#define XFS_FMR_OWN_COW FMR_OWNER('X', 7) /* cow staging */
+#define XFS_FMR_OWN_DEFECTIVE FMR_OWNER('X', 8) /* bad blocks */
+
/*
* Structure for XFS_IOC_FSSETDM.
* For use by backup and restore programs to set the XFS on-disk inode
@@ -502,6 +514,7 @@ typedef struct xfs_swapext
#define XFS_IOC_GETBMAPX _IOWR('X', 56, struct getbmap)
#define XFS_IOC_ZERO_RANGE _IOW ('X', 57, struct xfs_flock64)
#define XFS_IOC_FREE_EOFBLOCKS _IOR ('X', 58, struct xfs_fs_eofblocks)
+/* XFS_IOC_GETFSMAP ------ hoisted 59 */
/*
* ioctl commands that replace IRIX syssgi()'s