NTFS: Add an extra parameter @last_vcn to ntfs_get_size_for_mapping_pairs()

      and ntfs_mapping_pairs_build() to allow the runlist encoding to be
      partial which is desirable when filling holes in sparse attributes.
      Update all callers.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

fs/ntfs/ChangeLog

@@ -135,6 +135,10 @@ ToDo/Notes:
 	- Change the runlist terminator of the newly allocated cluster(s) to
 	  LCN_ENOENT in ntfs_attr_make_non_resident().  Otherwise the runlist
 	  code gets confused.
+	- Add an extra parameter @last_vcn to ntfs_get_size_for_mapping_pairs()
+	  and ntfs_mapping_pairs_build() to allow the runlist encoding to be
+	  partial which is desirable when filling holes in sparse attributes.
+	  Update all callers.
 
 2.1.22 - Many bug and race fixes and error handling improvements.
 

fs/ntfs/attrib.c

@@ -1317,7 +1317,7 @@ int ntfs_attr_make_non_resident(ntfs_inode *ni)
 		page = NULL;
 	}
 	/* Determine the size of the mapping pairs array. */
-	mp_size = ntfs_get_size_for_mapping_pairs(vol, rl, 0);
+	mp_size = ntfs_get_size_for_mapping_pairs(vol, rl, 0, -1);
 	if (unlikely(mp_size < 0)) {
 		err = mp_size;
 		ntfs_debug("Failed to get size for mapping pairs array, error "
@@ -1416,7 +1416,7 @@ int ntfs_attr_make_non_resident(ntfs_inode *ni)
 			cpu_to_sle64(attr_size);
 	/* Generate the mapping pairs array into the attribute record. */
 	err = ntfs_mapping_pairs_build(vol, (u8*)a + mp_ofs,
-			arec_size - mp_ofs, rl, 0, NULL);
+			arec_size - mp_ofs, rl, 0, -1, NULL);
 	if (unlikely(err)) {
 		ntfs_debug("Failed to build mapping pairs, error code %i.",
 				err);

fs/ntfs/mft.c

@@ -1407,7 +1407,7 @@ static int ntfs_mft_bitmap_extend_allocation_nolock(ntfs_volume *vol)
 	BUG_ON(ll < rl2->vcn);
 	BUG_ON(ll >= rl2->vcn + rl2->length);
 	/* Get the size for the new mapping pairs array for this extent. */
-	mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, ll);
+	mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, ll, -1);
 	if (unlikely(mp_size <= 0)) {
 		ntfs_error(vol->sb, "Get size for mapping pairs failed for "
 				"mft bitmap attribute extent.");
@@ -1441,7 +1441,7 @@ static int ntfs_mft_bitmap_extend_allocation_nolock(ntfs_volume *vol)
 	/* Generate the mapping pairs array directly into the attr record. */
 	ret = ntfs_mapping_pairs_build(vol, (u8*)a +
 			le16_to_cpu(a->data.non_resident.mapping_pairs_offset),
-			mp_size, rl2, ll, NULL);
+			mp_size, rl2, ll, -1, NULL);
 	if (unlikely(ret)) {
 		ntfs_error(vol->sb, "Failed to build mapping pairs array for "
 				"mft bitmap attribute.");
@@ -1529,7 +1529,7 @@ static int ntfs_mft_bitmap_extend_allocation_nolock(ntfs_volume *vol)
 				a->data.non_resident.mapping_pairs_offset),
 				old_alen - le16_to_cpu(
 				a->data.non_resident.mapping_pairs_offset),
-				rl2, ll, NULL)) {
+				rl2, ll, -1, NULL)) {
 			ntfs_error(vol->sb, "Failed to restore mapping pairs "
 					"array.%s", es);
 			NVolSetErrors(vol);
@@ -1838,7 +1838,7 @@ static int ntfs_mft_data_extend_allocation_nolock(ntfs_volume *vol)
 	BUG_ON(ll < rl2->vcn);
 	BUG_ON(ll >= rl2->vcn + rl2->length);
 	/* Get the size for the new mapping pairs array for this extent. */
-	mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, ll);
+	mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, ll, -1);
 	if (unlikely(mp_size <= 0)) {
 		ntfs_error(vol->sb, "Get size for mapping pairs failed for "
 				"mft data attribute extent.");
@@ -1877,7 +1877,7 @@ static int ntfs_mft_data_extend_allocation_nolock(ntfs_volume *vol)
 	/* Generate the mapping pairs array directly into the attr record. */
 	ret = ntfs_mapping_pairs_build(vol, (u8*)a +
 			le16_to_cpu(a->data.non_resident.mapping_pairs_offset),
-			mp_size, rl2, ll, NULL);
+			mp_size, rl2, ll, -1, NULL);
 	if (unlikely(ret)) {
 		ntfs_error(vol->sb, "Failed to build mapping pairs array of "
 				"mft data attribute.");
@@ -1959,7 +1959,7 @@ static int ntfs_mft_data_extend_allocation_nolock(ntfs_volume *vol)
 				a->data.non_resident.mapping_pairs_offset),
 				old_alen - le16_to_cpu(
 				a->data.non_resident.mapping_pairs_offset),
-				rl2, ll, NULL)) {
+				rl2, ll, -1, NULL)) {
 			ntfs_error(vol->sb, "Failed to restore mapping pairs "
 					"array.%s", es);
 			NVolSetErrors(vol);

fs/ntfs/runlist.h

@@ -84,11 +84,12 @@ extern runlist_element *ntfs_rl_find_vcn_nolock(runlist_element *rl,
 		const VCN vcn);
 
 extern int ntfs_get_size_for_mapping_pairs(const ntfs_volume *vol,
-		const runlist_element *rl, const VCN start_vcn);
+		const runlist_element *rl, const VCN first_vcn,
+		const VCN last_vcn);
 
 extern int ntfs_mapping_pairs_build(const ntfs_volume *vol, s8 *dst,
 		const int dst_len, const runlist_element *rl,
-		const VCN start_vcn, VCN *const stop_vcn);
+		const VCN first_vcn, const VCN last_vcn, VCN *const stop_vcn);
 
 extern int ntfs_rl_truncate_nolock(const ntfs_volume *vol,
 		runlist *const runlist, const s64 new_length);