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* fhandler.cc (fhandler_base::write): Don't attempt to sparsify

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an already sparse file.  Drop check for FILE_SUPPORTS_SPARSE_FILES
	flag.  Explicitely set FILE_ATTRIBUTE_SPARSE_FILE attribute in
	cached attributes.
	(fhandler_base::lseek): Only set did_lseek if sparseness is supported.
	* fhandler_disk_file.cc (fhandler_disk_file::ftruncate): Don't attempt
	to sparsify an already sparse file.  Explicitely set
	FILE_ATTRIBUTE_SPARSE_FILE attribute in cached attributes.
	* mount.cc (oopt): Add "sparse" flag.
	(fillout_mntent): Ditto.
	* path.h (enum path_types): Add PATH_SPARSE.
	(path_conv::support_sparse): New method.
	(path_conv::fs_flags): Constify.
	(path_conv::fs_name_len): Ditto.
	include/sys/mount.h: Replace unused MOUNT_MIXED flag with MOUNT_SPARSE.
This commit is contained in:
Corinna Vinschen
2012-12-14 10:45:29 +00:00
parent 60f901f4a9
commit 05297cca5f
6 changed files with 48 additions and 12 deletions
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7
winsup/cygwin/fhandler_disk_file.cc
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@@ -1189,12 +1189,15 @@ fhandler_disk_file::ftruncate (_off64_t length, bool allow_truncate)
feofi.EndOfFile.QuadPart = length;
/* Create sparse files only when called through ftruncate, not when
called through posix_fallocate. */
if (allow_truncate
&& (pc.fs_flags () & FILE_SUPPORTS_SPARSE_FILES)
if (allow_truncate && pc.support_sparse ()
&& !has_attribute (FILE_ATTRIBUTE_SPARSE_FILE)
&& length >= fsi.EndOfFile.QuadPart + (128 * 1024))
{
status = NtFsControlFile (get_handle (), NULL, NULL, NULL, &io,
FSCTL_SET_SPARSE, NULL, 0, NULL, 0);
if (NT_SUCCESS (status))
pc.file_attributes (pc.file_attributes ()
| FILE_ATTRIBUTE_SPARSE_FILE);
syscall_printf ("%p = NtFsControlFile(%S, FSCTL_SET_SPARSE)",
status, pc.get_nt_native_path ());
}