NTFS: - Change ntfs_cluster_alloc() to take an extra boolean parameter

[sfrench/cifs-2.6.git] / fs / ntfs / lcnalloc.c

diff --git a/fs/ntfs/lcnalloc.c b/fs/ntfs/lcnalloc.c
index 75313f4307e3a4fe743ba998987e933c7c2bf418..29cabf93d2d24ed66ffd0aff3a5478163e93f210 100644 (file)
--- a/fs/ntfs/lcnalloc.c
+++ b/fs/ntfs/lcnalloc.c
@@ -76,6 +76,7 @@ int ntfs_cluster_free_from_rl_nolock(ntfs_volume *vol,
  * @count:     number of clusters to allocate
  * @start_lcn: starting lcn at which to allocate the clusters (or -1 if none)
  * @zone:      zone from which to allocate the clusters
+ * @is_extension:      if TRUE, this is an attribute extension
  *
  * Allocate @count clusters preferably starting at cluster @start_lcn or at the
  * current allocator position if @start_lcn is -1, on the mounted ntfs volume
@@ -86,6 +87,13 @@ int ntfs_cluster_free_from_rl_nolock(ntfs_volume *vol,
  * @start_vcn specifies the vcn of the first allocated cluster.  This makes
  * merging the resulting runlist with the old runlist easier.
  *
+ * If @is_extension is TRUE, the caller is allocating clusters to extend an
+ * attribute and if it is FALSE, the caller is allocating clusters to fill a
+ * hole in an attribute.  Practically the difference is that if @is_extension
+ * is TRUE the returned runlist will be terminated with LCN_ENOENT and if
+ * @is_extension is FALSE the runlist will be terminated with
+ * LCN_RL_NOT_MAPPED.
+ *
  * You need to check the return value with IS_ERR().  If this is false, the
  * function was successful and the return value is a runlist describing the
  * allocated cluster(s).  If IS_ERR() is true, the function failed and
@@ -137,7 +145,8 @@ int ntfs_cluster_free_from_rl_nolock(ntfs_volume *vol,
  */
 runlist_element *ntfs_cluster_alloc(ntfs_volume *vol, const VCN start_vcn,
                const s64 count, const LCN start_lcn,
-               const NTFS_CLUSTER_ALLOCATION_ZONES zone)
+               const NTFS_CLUSTER_ALLOCATION_ZONES zone,
+               const BOOL is_extension)
 {
        LCN zone_start, zone_end, bmp_pos, bmp_initial_pos, last_read_pos, lcn;
        LCN prev_lcn = 0, prev_run_len = 0, mft_zone_size;
@@ -310,7 +319,7 @@ runlist_element *ntfs_cluster_alloc(ntfs_volume *vol, const VCN start_vcn,
                                continue;
                        }
                        bit = 1 << (lcn & 7);
-                       ntfs_debug("bit %i.", bit);
+                       ntfs_debug("bit 0x%x.", bit);
                        /* If the bit is already set, go onto the next one. */
                        if (*byte & bit) {
                                lcn++;
@@ -729,7 +738,7 @@ out:
        /* Add runlist terminator element. */
        if (likely(rl)) {
                rl[rlpos].vcn = rl[rlpos - 1].vcn + rl[rlpos - 1].length;
-               rl[rlpos].lcn = LCN_RL_NOT_MAPPED;
+               rl[rlpos].lcn = is_extension ? LCN_ENOENT : LCN_RL_NOT_MAPPED;
                rl[rlpos].length = 0;
        }
        if (likely(page && !IS_ERR(page))) {