[IO] Remove read-only logic in mono_w32_get_disk_free_space (mono/mono#17177)

This brings us in line with GetDiskFreeSpaceExW on Windows as well as .NET Core.

Commit migrated from https://github.com/mono/mono/commit/6f723639326f6c479b604c0d955991519d85ff2d

diff --git a/src/mono/mono/metadata/w32file-unix.c b/src/mono/mono/metadata/w32file-unix.c
index 33f66a5..4203e15 100644 (file)
--- a/src/mono/mono/metadata/w32file-unix.c
+++ b/src/mono/mono/metadata/w32file-unix.c
@@ -4382,7 +4382,6 @@ mono_w32file_get_disk_free_space (const gunichar2 *path_name, guint64 *free_byte
 #elif defined(HAVE_STATFS)
        struct statfs fsstat;
 #endif
-       gboolean isreadonly;
        gchar *utf8_path_name;
        gint ret;
        unsigned long block_size;
@@ -4411,17 +4410,11 @@ mono_w32file_get_disk_free_space (const gunichar2 *path_name, guint64 *free_byte
                MONO_ENTER_GC_SAFE;
                ret = statvfs (utf8_path_name, &fsstat);
                MONO_EXIT_GC_SAFE;
-               isreadonly = ((fsstat.f_flag & ST_RDONLY) == ST_RDONLY);
                block_size = fsstat.f_frsize;
 #elif defined(HAVE_STATFS)
                MONO_ENTER_GC_SAFE;
                ret = statfs (utf8_path_name, &fsstat);
                MONO_EXIT_GC_SAFE;
-#if defined (MNT_RDONLY)
-               isreadonly = ((fsstat.f_flags & MNT_RDONLY) == MNT_RDONLY);
-#elif defined (MS_RDONLY)
-               isreadonly = ((fsstat.f_flags & MS_RDONLY) == MS_RDONLY);
-#endif
                block_size = fsstat.f_bsize;
 #endif
        } while(ret == -1 && errno == EINTR);
@@ -4435,19 +4428,13 @@ mono_w32file_get_disk_free_space (const gunichar2 *path_name, guint64 *free_byte
        }
 
        /* total number of free bytes for non-root */
-       if (isreadonly)
-               *free_bytes_avail = 0;
-       else
-               *free_bytes_avail = block_size * (guint64)fsstat.f_bavail;
+       *free_bytes_avail = block_size * (guint64)fsstat.f_bavail;
 
        /* total number of bytes available for non-root */
        *total_number_of_bytes = block_size * (guint64)fsstat.f_blocks;
 
        /* total number of bytes available for root */
-       if (isreadonly)
-               *total_number_of_free_bytes = 0;
-       else
-               *total_number_of_free_bytes = block_size * (guint64)fsstat.f_bfree;
+       *total_number_of_free_bytes = block_size * (guint64)fsstat.f_bfree;
 #endif
        return(TRUE);
 }