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Bug 791301 - Generic fallocate code is broken for files smaller than system block size. r=taras

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This commit is contained in:
Gian-Carlo Pascutto 2012-09-17 13:27:24 +02:00
parent d44653555d
commit 95deb6b017
1 changed files with 3 additions and 2 deletions
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5
xpcom/glue/FileUtils.cpp
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@ -83,12 +83,13 @@ mozilla::fallocate(PRFileDesc *aFD, int64_t aLength)
int nWrite; // Return value from write()
int64_t iWrite = ((buf.st_size + 2 * nBlk - 1) / nBlk) * nBlk - 1; // Next offset to write to
do {
while (iWrite < aLength) {
nWrite = 0;
if (PR_Seek64(aFD, iWrite, PR_SEEK_SET) == iWrite)
nWrite = PR_Write(aFD, "", 1);
if (nWrite != 1) break;
iWrite += nBlk;
} while (nWrite == 1 && iWrite < aLength);
}
PR_Seek64(aFD, oldpos, PR_SEEK_SET);
return nWrite == 1;