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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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17
winsup/cygwin/fhandler.cc
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@ -817,15 +817,17 @@ ssize_t __stdcall
fhandler_base::write (const void *ptr, size_t len)
{
int res;
IO_STATUS_BLOCK io;
FILE_POSITION_INFORMATION fpi;
FILE_STANDARD_INFORMATION fsi;
if (did_lseek ())
{
IO_STATUS_BLOCK io;
FILE_POSITION_INFORMATION fpi;
FILE_STANDARD_INFORMATION fsi;
did_lseek (false); /* don't do it again */
if (!(get_flags () & O_APPEND)
&& !has_attribute (FILE_ATTRIBUTE_SPARSE_FILE)
&& NT_SUCCESS (NtQueryInformationFile (get_output_handle (),
&io, &fsi, sizeof fsi,
FileStandardInformation))
@ -833,8 +835,7 @@ fhandler_base::write (const void *ptr, size_t len)
&io, &fpi, sizeof fpi,
FilePositionInformation))
&& fpi.CurrentByteOffset.QuadPart
>= fsi.EndOfFile.QuadPart + (128 * 1024)
&& (pc.fs_flags () & FILE_SUPPORTS_SPARSE_FILES))
>= fsi.EndOfFile.QuadPart + (128 * 1024))
{
/* If the file system supports sparse files and the application
is writing after a long seek beyond EOF, convert the file to
@ -842,6 +843,9 @@ fhandler_base::write (const void *ptr, size_t len)
NTSTATUS status;
status = NtFsControlFile (get_output_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);
debug_printf ("%p = NtFsControlFile(%S, FSCTL_SET_SPARSE)",
status, pc.get_nt_native_path ());
}
@ -1071,7 +1075,8 @@ fhandler_base::lseek (_off64_t offset, int whence)
/* When next we write(), we will check to see if *this* seek went beyond
the end of the file and if so, potentially sparsify the file. */
did_lseek (true);
if (pc.support_sparse ())
did_lseek (true);
/* If this was a SEEK_CUR with offset 0, we still might have
readahead that we have to take into account when calculating