diff options
| author | Corinna Vinschen <corinna@vinschen.de> | 2023-11-27 23:14:49 +0300 |
|---|---|---|
| committer | Corinna Vinschen <corinna@vinschen.de> | 2023-11-28 12:55:33 +0300 |
| commit | 7f9caa4a3698827010d9b478407d21dd58b8bca5 (patch) | |
| tree | d6e7d97d33bab68ccfcc9d03a4d69e63702314f7 /winsup | |
| parent | e01c50c7b0a6c5d2a25feb02958d57902c25c141 (diff) | |
Cygwin: open(2): reset sparseness on O_TRUNCated files
open(2) implements O_TRUNC by just reducing the size of the file
to 0, to make sure EAs stay available.
Turns out, file sparseness is not removed this way either, so add
code to do just that.
Fixes: 603ef545bdbd ("* fhandler.cc (fhandler_base::open): Never open files with FILE_OVERWITE/FILE_OVERWRITE_IF.")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Diffstat (limited to 'winsup')
| -rw-r--r-- | winsup/cygwin/fhandler/base.cc | 9 | ||||
| -rw-r--r-- | winsup/cygwin/release/3.4.10 | 3 |
2 files changed, 12 insertions, 0 deletions
diff --git a/winsup/cygwin/fhandler/base.cc b/winsup/cygwin/fhandler/base.cc index d859870cb..b93366254 100644 --- a/winsup/cygwin/fhandler/base.cc +++ b/winsup/cygwin/fhandler/base.cc @@ -776,6 +776,15 @@ fhandler_base::open (int flags, mode_t mode) NtClose (fh); goto done; } + /* Drop sparseness */ + if (pc.file_attributes () & FILE_ATTRIBUTE_SPARSE_FILE) + { + FILE_SET_SPARSE_BUFFER fssb = { SetSparse: FALSE }; + status = NtFsControlFile (fh, NULL, NULL, NULL, &io, + FSCTL_SET_SPARSE, &fssb, sizeof fssb, NULL, 0); + if (NT_SUCCESS (status)) + pc.file_attributes (pc.file_attributes () & ~FILE_ATTRIBUTE_SPARSE_FILE); + } } set_handle (fh); diff --git a/winsup/cygwin/release/3.4.10 b/winsup/cygwin/release/3.4.10 index 02f688583..632ffcd39 100644 --- a/winsup/cygwin/release/3.4.10 +++ b/winsup/cygwin/release/3.4.10 @@ -21,3 +21,6 @@ Bug Fixes - Fix posix_fallocate(3) return value in case of being called on other than regular files. + +- Reset sparseness in case open(2) has been called with O_CREAT|O_TRUNC on + sparse files. |