hardcoresushi/libgocryptfs
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fusefrontend: Allow to create sparse file of size 4096.

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When the old size is zero, there are no existing blocks to merge the
new data with. Directly use Ftruncate if the size is block-aligned.

Fixes https://github.com/rfjakob/gocryptfs/issues/305
This commit is contained in:
Sebastian Lackner 2019-01-03 22:00:36 +01:00 committed by rfjakob
parent ab169443fd
commit acf7e52022
1 changed files with 10 additions and 11 deletions
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7
internal/fusefrontend/file_allocate_truncate.go
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@ -181,11 +181,9 @@ func (f *File) truncateGrowFile(oldPlainSz uint64, newPlainSz uint64) fuse.Statu
if newPlainSz <= oldPlainSz {
log.Panicf("BUG: newSize=%d <= oldSize=%d", newPlainSz, oldPlainSz)
}
var n1 uint64
if oldPlainSz > 0 {
n1 = f.contentEnc.PlainOffToBlockNo(oldPlainSz - 1)
}
newEOFOffset := newPlainSz - 1
if oldPlainSz > 0 {
n1 := f.contentEnc.PlainOffToBlockNo(oldPlainSz - 1)
n2 := f.contentEnc.PlainOffToBlockNo(newEOFOffset)
// The file is grown within one block, no need to pad anything.
// Write a single zero to the last byte and let doWrite figure out the RMW.
@ -194,6 +192,7 @@ func (f *File) truncateGrowFile(oldPlainSz uint64, newPlainSz uint64) fuse.Statu
_, status := f.doWrite(buf, int64(newEOFOffset))
return status
}
}
// The truncate creates at least one new block.
//
// Make sure the old last block is padded to the block boundary. This call