| /* Copyright (C) 1998-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <assert.h> |
| #include <errno.h> |
| #include <mntent.h> |
| #include <paths.h> |
| #include <stdbool.h> |
| #include <stdio_ext.h> |
| #include <string.h> |
| #include <sys/mount.h> |
| #include <sys/stat.h> |
| #include <sys/statfs.h> |
| #include "internal_statvfs.h" |
| #include "linux_fsinfo.h" |
| #include <kernel-features.h> |
| |
| |
| /* Special internal-only bit value. */ |
| #define ST_VALID 0x0020 |
| |
| |
| #ifndef STATFS |
| # define STATFS statfs |
| # define STATVFS statvfs |
| # define INTERNAL_STATVFS __internal_statvfs |
| #else |
| extern int __statvfs_getflags (const char *name, int fstype, int fd); |
| #endif |
| |
| |
| void |
| INTERNAL_STATVFS (const char *name, struct STATVFS *buf, |
| struct STATFS *fsbuf, int fd) |
| { |
| /* Now fill in the fields we have information for. */ |
| buf->f_bsize = fsbuf->f_bsize; |
| /* Linux has the f_frsize size only in later version of the kernel. |
| If the value is not filled in use f_bsize. */ |
| buf->f_frsize = fsbuf->f_frsize ?: fsbuf->f_bsize; |
| buf->f_blocks = fsbuf->f_blocks; |
| buf->f_bfree = fsbuf->f_bfree; |
| buf->f_bavail = fsbuf->f_bavail; |
| buf->f_files = fsbuf->f_files; |
| buf->f_ffree = fsbuf->f_ffree; |
| if (sizeof (buf->f_fsid) == sizeof (fsbuf->f_fsid)) |
| /* The shifting uses 'unsigned long long int' even though the target |
| field might only have 32 bits. This is OK since the 'if' branch |
| is not used in this case but the compiler would still generate |
| warnings. */ |
| buf->f_fsid = ((fsbuf->f_fsid.__val[0] |
| & ((1ULL << (8 * sizeof (fsbuf->f_fsid.__val[0]))) - 1)) |
| | ((unsigned long long int) fsbuf->f_fsid.__val[1] |
| << (8 * (sizeof (buf->f_fsid) |
| - sizeof (fsbuf->f_fsid.__val[0]))))); |
| else |
| /* We cannot help here. The statvfs element is not large enough to |
| contain both words of the statfs f_fsid field. */ |
| buf->f_fsid = fsbuf->f_fsid.__val[0]; |
| #ifdef _STATVFSBUF_F_UNUSED |
| buf->__f_unused = 0; |
| #endif |
| buf->f_namemax = fsbuf->f_namelen; |
| memset (buf->__f_spare, '\0', sizeof (buf->__f_spare)); |
| |
| /* What remains to do is to fill the fields f_favail and f_flag. */ |
| |
| /* XXX I have no idea how to compute f_favail. Any idea??? */ |
| buf->f_favail = buf->f_ffree; |
| |
| buf->f_flag = fsbuf->f_flags ^ ST_VALID; |
| } |