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ntfs_attr_pwrite: Write 4096 bytes blocks when possible. (David Fox, Szaka, Anton, Yura)

edge.strict_endians
Yura Pakhuchiy 2007-09-15 23:03:10 +03:00
parent 37476cf609
commit bf3a7442eb
1 changed files with 31 additions and 5 deletions
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36
libntfs/attrib.c
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@ -1323,11 +1323,37 @@ retry:
ntfs_log_trace("Writing 0x%llx bytes to vcn 0x%llx, lcn 0x%llx,"
" ofs 0x%llx.\n", to_write, rl->vcn, rl->lcn,
ofs);
if (!NVolReadOnly(vol))
written = ntfs_pwrite(vol->dev, (rl->lcn <<
vol->cluster_size_bits) + ofs,
to_write, b);
else
if (!NVolReadOnly(vol)) {
s64 pos = (rl->lcn << vol->cluster_size_bits) + ofs;
int bsize = 4096; /* FIXME: Test whether we need
PAGE_SIZE here. Eg., on IA64. */
/*
* Write 4096 size blocks if it's possible. This will
* cause the kernel not to seek and read disk blocks for
* filling the end of the buffer which increases write
* speed.
*/
if (vol->cluster_size >= bsize && !(ofs % bsize) &&
(to_write % bsize) && ofs + to_write ==
na->initialized_size) {
char *cb;
s64 rounded = (to_write + bsize - 1) &
~(bsize - 1);
cb = ntfs_malloc(rounded);
if (!cb)
goto err_out;
memcpy(cb, b, to_write);
memset(cb + to_write, 0, rounded - to_write);
written = ntfs_pwrite(vol->dev, pos, rounded,
cb);
if (written > to_write)
written = to_write;
free(cb);
} else
written = ntfs_pwrite(vol->dev, pos, to_write,
b);
} else
written = to_write;
/* If everything ok, update progress counters and continue. */
if (written > 0) {