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ntfs_attr_pwrite: fix rounding condition

master
szaka 2009-03-05 23:04:08 +00:00
parent 705cd1c22f
commit 24b4391bc6
1 changed files with 6 additions and 7 deletions
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13
libntfs-3g/attrib.c
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@ -1352,18 +1352,17 @@ retry:
s64 wpos = (rl->lcn << vol->cluster_size_bits) + ofs;
s64 wend = (rl->vcn << vol->cluster_size_bits) + ofs + to_write;
u32 bsize = vol->cluster_size;
/* Byte size needed to zero fill a cluster */
s64 rounded = ((wend + bsize - 1) & ~(s64)(bsize - 1)) - wend;
/*
* Zero fill to cluster boundary if we're writing to an
* ex-sparse cluster or we're at the end of the attribute.
/**
* Zero fill to cluster boundary if we're writing at the
* end of the attribute or into an ex-sparse cluster.
* This will cause the kernel not to seek and read disk
* blocks during write(2) to fill the end of the buffer
* which increases write speed by 2-10 fold typically.
*/
if ((rounded && (wend < (hole << vol->cluster_size_bits))) ||
(((to_write % bsize) &&
(wend == na->initialized_size)))) {
if (rounded && ((wend == na->initialized_size) ||
(wend < (hole << vol->cluster_size_bits)))) {
char *cb;