diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/pathconf.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/pathconf.c | 293 |
1 files changed, 0 insertions, 293 deletions
diff --git a/sysdeps/unix/sysv/linux/pathconf.c b/sysdeps/unix/sysv/linux/pathconf.c deleted file mode 100644 index 01d8c2bedd..0000000000 --- a/sysdeps/unix/sysv/linux/pathconf.c +++ /dev/null @@ -1,293 +0,0 @@ -/* Get file-specific information about a file. Linux version. - Copyright (C) 1991-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - 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 <errno.h> -#include <mntent.h> -#include <stdio_ext.h> -#include <string.h> -#include <unistd.h> -#include <sys/sysmacros.h> - -#include "pathconf.h" -#include "linux_fsinfo.h" -#include <not-cancel.h> - -static long int posix_pathconf (const char *file, int name); - -/* Define this first, so it can be inlined. */ -#define __pathconf static posix_pathconf -#include <sysdeps/posix/pathconf.c> - - -/* Get file-specific information about FILE. */ -long int -__pathconf (const char *file, int name) -{ - struct statfs fsbuf; - - switch (name) - { - case _PC_LINK_MAX: - return __statfs_link_max (__statfs (file, &fsbuf), &fsbuf, file, -1); - - case _PC_FILESIZEBITS: - return __statfs_filesize_max (__statfs (file, &fsbuf), &fsbuf); - - case _PC_2_SYMLINKS: - return __statfs_symlinks (__statfs (file, &fsbuf), &fsbuf); - - case _PC_CHOWN_RESTRICTED: - return __statfs_chown_restricted (__statfs (file, &fsbuf), &fsbuf); - - default: - return posix_pathconf (file, name); - } -} - - -static long int -distinguish_extX (const struct statfs *fsbuf, const char *file, int fd) -{ - char buf[64]; - char path[PATH_MAX]; - struct stat64 st; - - if ((file == NULL ? fstat64 (fd, &st) : stat64 (file, &st)) != 0) - /* Strange. The statfd call worked, but stat fails. Default to - the more pessimistic value. */ - return EXT2_LINK_MAX; - - __snprintf (buf, sizeof (buf), "/sys/dev/block/%u:%u", - gnu_dev_major (st.st_dev), gnu_dev_minor (st.st_dev)); - - ssize_t n = __readlink (buf, path, sizeof (path)); - if (n != -1 && n < sizeof (path)) - { - path[n] = '\0'; - char *base = strdupa (__basename (path)); - __snprintf (path, sizeof (path), "/sys/fs/ext4/%s", base); - - return __access (path, F_OK) == 0 ? EXT4_LINK_MAX : EXT2_LINK_MAX; - } - - /* XXX Is there a better way to distinguish ext2/3 from ext4 than - iterating over the mounted filesystems and compare the device - numbers? */ - FILE *mtab = __setmntent ("/proc/mounts", "r"); - if (mtab == NULL) - mtab = __setmntent (_PATH_MOUNTED, "r"); - - /* By default be conservative. */ - long int result = EXT2_LINK_MAX; - if (mtab != NULL) - { - struct mntent mntbuf; - char tmpbuf[1024]; - - /* No locking needed. */ - (void) __fsetlocking (mtab, FSETLOCKING_BYCALLER); - - while (__getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf))) - { - if (strcmp (mntbuf.mnt_type, "ext2") != 0 - && strcmp (mntbuf.mnt_type, "ext3") != 0 - && strcmp (mntbuf.mnt_type, "ext4") != 0) - continue; - - struct stat64 fsst; - if (stat64 (mntbuf.mnt_dir, &fsst) >= 0 - && st.st_dev == fsst.st_dev) - { - if (strcmp (mntbuf.mnt_type, "ext4") == 0) - result = EXT4_LINK_MAX; - break; - } - } - - /* Close the file. */ - __endmntent (mtab); - } - - return result; -} - - -/* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */ -long int -__statfs_link_max (int result, const struct statfs *fsbuf, const char *file, - int fd) -{ - if (result < 0) - { - if (errno == ENOSYS) - /* Not possible, return the default value. */ - return LINUX_LINK_MAX; - - /* Some error occured. */ - return -1; - } - - switch (fsbuf->f_type) - { - case EXT2_SUPER_MAGIC: - /* Unfortunately the kernel does not return a different magic number - for ext4. This would be necessary to easily detect etx4 since it - has a different LINK_MAX value. Therefore we have to find it out - the hard way. */ - return distinguish_extX (fsbuf, file, fd); - - case F2FS_SUPER_MAGIC: - return F2FS_LINK_MAX; - - case MINIX_SUPER_MAGIC: - case MINIX_SUPER_MAGIC2: - return MINIX_LINK_MAX; - - case MINIX2_SUPER_MAGIC: - case MINIX2_SUPER_MAGIC2: - return MINIX2_LINK_MAX; - - case XENIX_SUPER_MAGIC: - return XENIX_LINK_MAX; - - case SYSV4_SUPER_MAGIC: - case SYSV2_SUPER_MAGIC: - return SYSV_LINK_MAX; - - case COH_SUPER_MAGIC: - return COH_LINK_MAX; - - case UFS_MAGIC: - case UFS_CIGAM: - return UFS_LINK_MAX; - - case REISERFS_SUPER_MAGIC: - return REISERFS_LINK_MAX; - - case XFS_SUPER_MAGIC: - return XFS_LINK_MAX; - - case LUSTRE_SUPER_MAGIC: - return LUSTRE_LINK_MAX; - - default: - return LINUX_LINK_MAX; - } -} - - -/* Used like: return statfs_filesize_max (__statfs (name, &buf), &buf); */ -long int -__statfs_filesize_max (int result, const struct statfs *fsbuf) -{ - if (result < 0) - { - if (errno == ENOSYS) - /* Not possible, return the default value. */ - return 32; - - /* Some error occured. */ - return -1; - } - - switch (fsbuf->f_type) - { - case F2FS_SUPER_MAGIC: - return 256; - - case BTRFS_SUPER_MAGIC: - return 255; - - case EXT2_SUPER_MAGIC: - case UFS_MAGIC: - case UFS_CIGAM: - case REISERFS_SUPER_MAGIC: - case XFS_SUPER_MAGIC: - case SMB_SUPER_MAGIC: - case NTFS_SUPER_MAGIC: - case UDF_SUPER_MAGIC: - case JFS_SUPER_MAGIC: - case VXFS_SUPER_MAGIC: - case CGROUP_SUPER_MAGIC: - case LUSTRE_SUPER_MAGIC: - return 64; - - case MSDOS_SUPER_MAGIC: - case JFFS_SUPER_MAGIC: - case JFFS2_SUPER_MAGIC: - case NCP_SUPER_MAGIC: - case ROMFS_SUPER_MAGIC: - return 32; - - default: - return 32; - } -} - - -/* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */ -long int -__statfs_symlinks (int result, const struct statfs *fsbuf) -{ - if (result < 0) - { - if (errno == ENOSYS) - /* Not possible, return the default value. */ - return 1; - - /* Some error occured. */ - return -1; - } - - switch (fsbuf->f_type) - { - case ADFS_SUPER_MAGIC: - case BFS_MAGIC: - case CRAMFS_MAGIC: - case DEVPTS_SUPER_MAGIC: - case EFS_SUPER_MAGIC: - case EFS_MAGIC: - case MSDOS_SUPER_MAGIC: - case NTFS_SUPER_MAGIC: - case QNX4_SUPER_MAGIC: - case ROMFS_SUPER_MAGIC: - /* No symlink support. */ - return 0; - - default: - return 1; - } -} - - -/* Used like: return __statfs_chown_restricted (__statfs (name, &buf), &buf);*/ -long int -__statfs_chown_restricted (int result, const struct statfs *fsbuf) -{ - if (result < 0) - { - if (errno == ENOSYS) - /* Not possible, return the default value. */ - return 1; - - /* Some error occured. */ - return -1; - } - - return 1; -} |