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Fix stat.st_blocks for files compressed with CompactOS method 

Always retrieve FileCompressionInformation for non-empty
files if FileStandardInformation returns 0 allocated blocks.
This fixes stat.st_blocks for files compressed with CompactOS method.

Signed-off-by: Christian Franke <franke@computer.org>
This commit is contained in:
Christian Franke 2017-04-22 14:50:58 +02:00 committed by Corinna Vinschen
parent 8e0876727b
commit b8523353d7
1 changed files with 12 additions and 5 deletions
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17
winsup/cygwin/fhandler_disk_file.cc
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@ -463,18 +463,25 @@ fhandler_base::fstat_helper (struct stat *buf)
buf->st_blksize = PREFERRED_IO_BLKSIZE;
if (pfai->StandardInformation.AllocationSize.QuadPart >= 0LL)
if (buf->st_size == 0
&& pfai->StandardInformation.AllocationSize.QuadPart == 0LL)
/* File is empty and no blocks are preallocated. */
buf->st_blocks = 0;
else if (pfai->StandardInformation.AllocationSize.QuadPart > 0LL)
/* A successful NtQueryInformationFile returns the allocation size
correctly for compressed and sparse files as well. */
correctly for compressed and sparse files as well.
Allocation size 0 is ignored here because (at least) Windows 10
1607 always returns 0 for CompactOS compressed files. */
buf->st_blocks = (pfai->StandardInformation.AllocationSize.QuadPart
+ S_BLKSIZE - 1) / S_BLKSIZE;
else if (::has_attribute (attributes, FILE_ATTRIBUTE_COMPRESSED
| FILE_ATTRIBUTE_SPARSE_FILE)
else if ((pfai->StandardInformation.AllocationSize.QuadPart == 0LL
|| ::has_attribute (attributes, FILE_ATTRIBUTE_COMPRESSED
| FILE_ATTRIBUTE_SPARSE_FILE))
&& h && !is_fs_special ()
&& !NtQueryInformationFile (h, &st, (PVOID) &fci, sizeof fci,
FileCompressionInformation))
/* Otherwise we request the actual amount of bytes allocated for
compressed and sparsed files. */
compressed, sparsed and CompactOS files. */
buf->st_blocks = (fci.CompressedFileSize.QuadPart + S_BLKSIZE - 1)
/ S_BLKSIZE;
else