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Fixed cluster mapping ahead of mapped runlist 

A corner case was wrong and could cause aborted writes with error
"Run lists overlap. Cannot merge" when the clusters required by the
write are described in different MFT extents.
This can only happen in very fragmented files when the cluster size
is smaller than 4096 bytes. It does not cause any metadata corruption.
PERMISSION_HANDLING_BRANCH
Jean-Pierre André 2011-03-01 12:06:26 +01:00
parent 29190c9394
commit 54e49e77f1
1 changed files with 8 additions and 0 deletions
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8
libntfs-3g/attrib.c
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@ -603,6 +603,7 @@ static int ntfs_attr_map_partial_runlist(ntfs_attr *na, VCN vcn)
VCN last_vcn;
VCN highest_vcn;
VCN needed;
VCN existing_vcn;
runlist_element *rl;
ATTR_RECORD *a;
BOOL startseen;
@ -612,6 +613,8 @@ static int ntfs_attr_map_partial_runlist(ntfs_attr *na, VCN vcn)
if (lcn >= 0 || lcn == LCN_HOLE || lcn == LCN_ENOENT)
return 0;
existing_vcn = (na->rl ? na->rl->vcn : -1);
ctx = ntfs_attr_get_search_ctx(na->ni, NULL);
if (!ctx)
return -1;
@ -643,6 +646,11 @@ static int ntfs_attr_map_partial_runlist(ntfs_attr *na, VCN vcn)
needed = highest_vcn + 1;
if (!a->lowest_vcn)
startseen = TRUE;
/* reaching a previously allocated part ? */
if ((existing_vcn >= 0)
&& (needed >= existing_vcn)) {
needed = last_vcn;
}
}
} else
rl = (runlist_element*)NULL;