Export correct symbols for Lustre Direct I/O

Originally the Lustre ZFS OSD code was going to use zfs_uio_t structs
for supporting Direct I/O with ZFS. However, this has changed to using
abd_t structs instead. This exports the proper symbols that will be used
by the Lustre ZFS OSD code.

Reviewed-by: Tony Hutter <[email protected]>
Reviewed-by: Alexander Motin <[email protected]>
Signed-off-by: Brian Atkinson <[email protected]>
Closes #17256

Author: bwatkinson

module/os/linux/zfs/abd_os.c

@@ -1340,6 +1340,8 @@ abd_bio_map_off(struct bio *bio, abd_t *abd,
 	return (io_size);
 }
 
+EXPORT_SYMBOL(abd_alloc_from_pages);
+
 /* Tunable Parameters */
 module_param(zfs_abd_scatter_enabled, int, 0644);
 MODULE_PARM_DESC(zfs_abd_scatter_enabled,

module/zfs/abd.c

@@ -1210,3 +1210,5 @@ abd_raidz_rec_iterate(abd_t **cabds, abd_t **tabds,
 	}
 	abd_exit_critical(flags);
 }
+
+EXPORT_SYMBOL(abd_free);

module/zfs/dmu_direct.c

@@ -393,5 +393,5 @@ dmu_write_uio_direct(dnode_t *dn, zfs_uio_t *uio, uint64_t size, dmu_tx_t *tx)
 }
 #endif /* _KERNEL */
 
-EXPORT_SYMBOL(dmu_read_uio_direct);
-EXPORT_SYMBOL(dmu_write_uio_direct);
+EXPORT_SYMBOL(dmu_read_abd);
+EXPORT_SYMBOL(dmu_write_abd);