| /* Copyright (C) 1998-2014 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 <sys/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 |
| |
| |
| # ifndef __ASSUME_STATFS_F_FLAGS |
| int |
| __statvfs_getflags (const char *name, int fstype, struct stat64 *st) |
| { |
| if (st == NULL) |
| return 0; |
| |
| const char *fsname = NULL; |
| const char *fsname2 = NULL; |
| const char *fsname3 = NULL; |
| |
| /* Map the filesystem type we got from the statfs call to a string. */ |
| switch (fstype) |
| { |
| case EXT2_SUPER_MAGIC: |
| fsname = "ext4"; |
| fsname2 = "ext3"; |
| fsname3 = "ext2"; |
| break; |
| case DEVPTS_SUPER_MAGIC: |
| fsname= "devpts"; |
| break; |
| case SHMFS_SUPER_MAGIC: |
| fsname = "tmpfs"; |
| break; |
| case PROC_SUPER_MAGIC: |
| fsname = "proc"; |
| break; |
| case USBDEVFS_SUPER_MAGIC: |
| fsname = "usbdevfs"; |
| break; |
| case AUTOFS_SUPER_MAGIC: |
| fsname = "autofs"; |
| break; |
| case NFS_SUPER_MAGIC: |
| fsname = "nfs"; |
| break; |
| case SYSFS_MAGIC: |
| fsname = "sysfs"; |
| break; |
| case REISERFS_SUPER_MAGIC: |
| fsname = "reiserfs"; |
| break; |
| case XFS_SUPER_MAGIC: |
| fsname = "xfs"; |
| break; |
| case JFS_SUPER_MAGIC: |
| fsname = "jfs"; |
| break; |
| case HPFS_SUPER_MAGIC: |
| fsname = "hpfs"; |
| break; |
| case DEVFS_SUPER_MAGIC: |
| fsname = "devfs"; |
| break; |
| case ISOFS_SUPER_MAGIC: |
| fsname = "iso9660"; |
| break; |
| case MSDOS_SUPER_MAGIC: |
| fsname = "msdos"; |
| break; |
| case NTFS_SUPER_MAGIC: |
| fsname = "ntfs"; |
| break; |
| case LOGFS_MAGIC_U32: |
| fsname = "logfs"; |
| break; |
| case BTRFS_SUPER_MAGIC: |
| fsname = "btrfs"; |
| break; |
| case CGROUP_SUPER_MAGIC: |
| fsname = "cgroup"; |
| break; |
| case LUSTRE_SUPER_MAGIC: |
| fsname = "lustre"; |
| break; |
| case F2FS_SUPER_MAGIC: |
| fsname = "f2fs"; |
| break; |
| case EFIVARFS_MAGIC: |
| fsname = "efivarfs"; |
| break; |
| } |
| |
| FILE *mtab = __setmntent ("/proc/mounts", "r"); |
| if (mtab == NULL) |
| mtab = __setmntent (_PATH_MOUNTED, "r"); |
| |
| int result = 0; |
| if (mtab != NULL) |
| { |
| bool success = false; |
| struct mntent mntbuf; |
| char tmpbuf[1024]; |
| |
| /* No locking needed. */ |
| (void) __fsetlocking (mtab, FSETLOCKING_BYCALLER); |
| |
| again: |
| while (__getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf))) |
| { |
| /* In a first round we look for a given mount point, if |
| we have a name. */ |
| if (name != NULL && strcmp (name, mntbuf.mnt_dir) != 0) |
| continue; |
| /* We need to look at the entry only if the filesystem |
| name matches. If we have a filesystem name. */ |
| else if (fsname != NULL |
| && strcmp (fsname, mntbuf.mnt_type) != 0 |
| && (fsname2 == NULL |
| || strcmp (fsname2, mntbuf.mnt_type) != 0) |
| && (fsname3 == NULL |
| || strcmp (fsname3, mntbuf.mnt_type) != 0)) |
| continue; |
| |
| /* Find out about the device the current entry is for. */ |
| struct stat64 fsst; |
| if (stat64 (mntbuf.mnt_dir, &fsst) >= 0 |
| && st->st_dev == fsst.st_dev) |
| { |
| /* Bingo, we found the entry for the device FD is on. |
| Now interpret the option string. */ |
| char *cp = mntbuf.mnt_opts; |
| char *opt; |
| |
| while ((opt = strsep (&cp, ",")) != NULL) |
| if (strcmp (opt, "ro") == 0) |
| result |= ST_RDONLY; |
| else if (strcmp (opt, "nosuid") == 0) |
| result |= ST_NOSUID; |
| else if (strcmp (opt, "noexec") == 0) |
| result |= ST_NOEXEC; |
| else if (strcmp (opt, "nodev") == 0) |
| result |= ST_NODEV; |
| else if (strcmp (opt, "sync") == 0) |
| result |= ST_SYNCHRONOUS; |
| else if (strcmp (opt, "mand") == 0) |
| result |= ST_MANDLOCK; |
| else if (strcmp (opt, "noatime") == 0) |
| result |= ST_NOATIME; |
| else if (strcmp (opt, "nodiratime") == 0) |
| result |= ST_NODIRATIME; |
| else if (strcmp (opt, "relatime") == 0) |
| result |= ST_RELATIME; |
| |
| /* We can stop looking for more entries. */ |
| success = true; |
| break; |
| } |
| } |
| /* Maybe the kernel names for the filesystems changed or the |
| statvfs call got a name which was not the mount point. Check |
| again, this time without checking for name matches first. */ |
| if (! success && (name != NULL || fsname != NULL)) |
| { |
| if (name != NULL) |
| /* Try without a mount point name. */ |
| name = NULL; |
| else |
| { |
| /* Try without a filesystem name. */ |
| assert (fsname != NULL); |
| fsname = fsname2 = fsname3 = NULL; |
| } |
| |
| /* It is not strictly allowed to use rewind here. But |
| this code is part of the implementation so it is |
| acceptable. */ |
| rewind (mtab); |
| |
| goto again; |
| } |
| |
| /* Close the file. */ |
| __endmntent (mtab); |
| } |
| |
| return result; |
| } |
| # endif |
| #else |
| extern int __statvfs_getflags (const char *name, int fstype, |
| struct stat64 *st); |
| #endif |
| |
| |
| void |
| INTERNAL_STATVFS (const char *name, struct STATVFS *buf, |
| struct STATFS *fsbuf, struct stat64 *st) |
| { |
| /* 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; |
| |
| #ifndef __ASSUME_STATFS_F_FLAGS |
| if ((fsbuf->f_flags & ST_VALID) == 0) |
| /* Determining the flags is tricky. We have to read /proc/mounts or |
| the /etc/mtab file and search for the entry which matches the given |
| file. The way we can test for matching filesystem is using the |
| device number. */ |
| buf->f_flag = __statvfs_getflags (name, fsbuf->f_type, st); |
| else |
| #endif |
| buf->f_flag = fsbuf->f_flags ^ ST_VALID; |
| } |