opengnsys
/
ntfs-3g
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Always instantiate holes

edge.strict_endians
yura 2006-10-27 14:18:02 +00:00
parent b1583bdce6
commit ab3519cbcd
1 changed files with 3 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
libntfs/attrib.c
View File

@ -1131,52 +1131,16 @@ s64 ntfs_attr_pwrite(ntfs_attr *na, const s64 pos, s64 count, const void *b)
LCN lcn_seek_from = -1;
runlist *rlc;
VCN cur_vcn, from_vcn;
s64 t;
int cnt;
if (rl->lcn != (LCN)LCN_HOLE) {
errno = EIO;
goto rl_err_out;
}
/*
* It is a hole. Check if the data buffer is zero in
* this region and if not instantiate the hole.
*/
to_write = min(count, (rl->length <<
vol->cluster_size_bits) - ofs);
written = to_write / sizeof(unsigned long);
eo = 0;
for (t = 0; t < written; t++) {
if (((const unsigned long*)b)[t]) {
eo = 1;
break;
}
}
cnt = to_write & (sizeof(unsigned long) - 1);
if (cnt && !eo) {
int i;
const u8 *b2;
b2 = (const u8*)b + (to_write &
~(sizeof(unsigned long) - 1));
for (i = 0; i < cnt; i++) {
if (b2[i]) {
eo = 1;
break;
}
}
}
if (!eo) {
/*
* The buffer region is zero, update progress
* counters and proceed with next run.
*/
total += to_write;
count -= to_write;
b = (const u8*)b + to_write;
continue;
}
/* The buffer is non zero, instantiate the hole. */
/* Instantiate the hole. */
cur_vcn = rl->vcn;
from_vcn = rl->vcn + (ofs >> vol->cluster_size_bits);
ntfs_log_trace("Instantiate hole with vcn 0x%llx.\n",