Split out part of mount-util.c into mountpoint-util.c
The idea is that anything which is related to actually manipulating mounts is
in mount-util.c, but functions for mountpoint introspection are moved to the
new file. Anything which requires libmount must be in mount-util.c.
This was supposed to be a preparation for further changes, with no functional
difference, but it results in a significant change in linkage:
$ ldd build/libnss_*.so.2
(before)
build/libnss_myhostname.so.2:
linux-vdso.so.1 (0x00007fff77bf5000)
librt.so.1 => /lib64/librt.so.1 (0x00007f4bbb7b2000)
libmount.so.1 => /lib64/libmount.so.1 (0x00007f4bbb755000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f4bbb734000)
libc.so.6 => /lib64/libc.so.6 (0x00007f4bbb56e000)
/lib64/ld-linux-x86-64.so.2 (0x00007f4bbb8c1000)
libblkid.so.1 => /lib64/libblkid.so.1 (0x00007f4bbb51b000)
libuuid.so.1 => /lib64/libuuid.so.1 (0x00007f4bbb512000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f4bbb4e3000)
libpcre2-8.so.0 => /lib64/libpcre2-8.so.0 (0x00007f4bbb45e000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f4bbb458000)
build/libnss_mymachines.so.2:
linux-vdso.so.1 (0x00007ffc19cc0000)
librt.so.1 => /lib64/librt.so.1 (0x00007fdecb74b000)
libcap.so.2 => /lib64/libcap.so.2 (0x00007fdecb744000)
libmount.so.1 => /lib64/libmount.so.1 (0x00007fdecb6e7000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fdecb6c6000)
libc.so.6 => /lib64/libc.so.6 (0x00007fdecb500000)
/lib64/ld-linux-x86-64.so.2 (0x00007fdecb8a9000)
libblkid.so.1 => /lib64/libblkid.so.1 (0x00007fdecb4ad000)
libuuid.so.1 => /lib64/libuuid.so.1 (0x00007fdecb4a2000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007fdecb475000)
libpcre2-8.so.0 => /lib64/libpcre2-8.so.0 (0x00007fdecb3f0000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007fdecb3ea000)
build/libnss_resolve.so.2:
linux-vdso.so.1 (0x00007ffe8ef8e000)
librt.so.1 => /lib64/librt.so.1 (0x00007fcf314bd000)
libcap.so.2 => /lib64/libcap.so.2 (0x00007fcf314b6000)
libmount.so.1 => /lib64/libmount.so.1 (0x00007fcf31459000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fcf31438000)
libc.so.6 => /lib64/libc.so.6 (0x00007fcf31272000)
/lib64/ld-linux-x86-64.so.2 (0x00007fcf31615000)
libblkid.so.1 => /lib64/libblkid.so.1 (0x00007fcf3121f000)
libuuid.so.1 => /lib64/libuuid.so.1 (0x00007fcf31214000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007fcf311e7000)
libpcre2-8.so.0 => /lib64/libpcre2-8.so.0 (0x00007fcf31162000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007fcf3115c000)
build/libnss_systemd.so.2:
linux-vdso.so.1 (0x00007ffda6d17000)
librt.so.1 => /lib64/librt.so.1 (0x00007f610b83c000)
libcap.so.2 => /lib64/libcap.so.2 (0x00007f610b835000)
libmount.so.1 => /lib64/libmount.so.1 (0x00007f610b7d8000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f610b7b7000)
libc.so.6 => /lib64/libc.so.6 (0x00007f610b5f1000)
/lib64/ld-linux-x86-64.so.2 (0x00007f610b995000)
libblkid.so.1 => /lib64/libblkid.so.1 (0x00007f610b59e000)
libuuid.so.1 => /lib64/libuuid.so.1 (0x00007f610b593000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f610b566000)
libpcre2-8.so.0 => /lib64/libpcre2-8.so.0 (0x00007f610b4e1000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f610b4db000)
(after)
build/libnss_myhostname.so.2:
linux-vdso.so.1 (0x00007fff0b5e2000)
librt.so.1 => /lib64/librt.so.1 (0x00007fde0c328000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fde0c307000)
libc.so.6 => /lib64/libc.so.6 (0x00007fde0c141000)
/lib64/ld-linux-x86-64.so.2 (0x00007fde0c435000)
build/libnss_mymachines.so.2:
linux-vdso.so.1 (0x00007ffdc30a7000)
librt.so.1 => /lib64/librt.so.1 (0x00007f06ecabb000)
libcap.so.2 => /lib64/libcap.so.2 (0x00007f06ecab4000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f06eca93000)
libc.so.6 => /lib64/libc.so.6 (0x00007f06ec8cd000)
/lib64/ld-linux-x86-64.so.2 (0x00007f06ecc15000)
build/libnss_resolve.so.2:
linux-vdso.so.1 (0x00007ffe95747000)
librt.so.1 => /lib64/librt.so.1 (0x00007fa56a80f000)
libcap.so.2 => /lib64/libcap.so.2 (0x00007fa56a808000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fa56a7e7000)
libc.so.6 => /lib64/libc.so.6 (0x00007fa56a621000)
/lib64/ld-linux-x86-64.so.2 (0x00007fa56a964000)
build/libnss_systemd.so.2:
linux-vdso.so.1 (0x00007ffe67b51000)
librt.so.1 => /lib64/librt.so.1 (0x00007ffb32113000)
libcap.so.2 => /lib64/libcap.so.2 (0x00007ffb3210c000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007ffb320eb000)
libc.so.6 => /lib64/libc.so.6 (0x00007ffb31f25000)
/lib64/ld-linux-x86-64.so.2 (0x00007ffb3226a000)
I don't quite understand what is going on here, but let's not be too picky.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
+1
-1
@@ -24,7 +24,7 @@
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#include "io-util.h"
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#include "macro.h"
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#include "missing.h"
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#include "mount-util.h"
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#include "mountpoint-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "time-util.h"
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@@ -96,6 +96,8 @@ basic_sources = files('''
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mkdir.h
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mount-util.c
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mount-util.h
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mountpoint-util.c
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mountpoint-util.h
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nss-util.h
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ordered-set.c
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ordered-set.h
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+1
-427
@@ -20,6 +20,7 @@
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#include "fs-util.h"
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#include "hashmap.h"
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#include "mount-util.h"
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#include "mountpoint-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "set.h"
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@@ -27,279 +28,6 @@
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#include "string-util.h"
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#include "strv.h"
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/* This is the original MAX_HANDLE_SZ definition from the kernel, when the API was introduced. We use that in place of
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* any more currently defined value to future-proof things: if the size is increased in the API headers, and our code
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* is recompiled then it would cease working on old kernels, as those refuse any sizes larger than this value with
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* EINVAL right-away. Hence, let's disconnect ourselves from any such API changes, and stick to the original definition
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* from when it was introduced. We use it as a start value only anyway (see below), and hence should be able to deal
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* with large file handles anyway. */
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#define ORIGINAL_MAX_HANDLE_SZ 128
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int name_to_handle_at_loop(
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int fd,
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const char *path,
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struct file_handle **ret_handle,
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int *ret_mnt_id,
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int flags) {
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_cleanup_free_ struct file_handle *h = NULL;
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size_t n = ORIGINAL_MAX_HANDLE_SZ;
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/* We need to invoke name_to_handle_at() in a loop, given that it might return EOVERFLOW when the specified
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* buffer is too small. Note that in contrast to what the docs might suggest, MAX_HANDLE_SZ is only good as a
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* start value, it is not an upper bound on the buffer size required.
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*
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* This improves on raw name_to_handle_at() also in one other regard: ret_handle and ret_mnt_id can be passed
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* as NULL if there's no interest in either. */
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for (;;) {
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int mnt_id = -1;
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h = malloc0(offsetof(struct file_handle, f_handle) + n);
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if (!h)
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return -ENOMEM;
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h->handle_bytes = n;
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if (name_to_handle_at(fd, path, h, &mnt_id, flags) >= 0) {
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if (ret_handle)
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*ret_handle = TAKE_PTR(h);
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if (ret_mnt_id)
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*ret_mnt_id = mnt_id;
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return 0;
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}
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if (errno != EOVERFLOW)
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return -errno;
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if (!ret_handle && ret_mnt_id && mnt_id >= 0) {
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/* As it appears, name_to_handle_at() fills in mnt_id even when it returns EOVERFLOW when the
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* buffer is too small, but that's undocumented. Hence, let's make use of this if it appears to
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* be filled in, and the caller was interested in only the mount ID an nothing else. */
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*ret_mnt_id = mnt_id;
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return 0;
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}
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/* If name_to_handle_at() didn't increase the byte size, then this EOVERFLOW is caused by something
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* else (apparently EOVERFLOW is returned for untriggered nfs4 mounts sometimes), not by the too small
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* buffer. In that case propagate EOVERFLOW */
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if (h->handle_bytes <= n)
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return -EOVERFLOW;
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/* The buffer was too small. Size the new buffer by what name_to_handle_at() returned. */
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n = h->handle_bytes;
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if (offsetof(struct file_handle, f_handle) + n < n) /* check for addition overflow */
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return -EOVERFLOW;
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h = mfree(h);
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}
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}
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static int fd_fdinfo_mnt_id(int fd, const char *filename, int flags, int *mnt_id) {
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char path[STRLEN("/proc/self/fdinfo/") + DECIMAL_STR_MAX(int)];
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_cleanup_free_ char *fdinfo = NULL;
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_cleanup_close_ int subfd = -1;
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char *p;
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int r;
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if ((flags & AT_EMPTY_PATH) && isempty(filename))
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xsprintf(path, "/proc/self/fdinfo/%i", fd);
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else {
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subfd = openat(fd, filename, O_CLOEXEC|O_PATH);
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if (subfd < 0)
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return -errno;
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xsprintf(path, "/proc/self/fdinfo/%i", subfd);
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}
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r = read_full_file(path, &fdinfo, NULL);
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if (r == -ENOENT) /* The fdinfo directory is a relatively new addition */
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return -EOPNOTSUPP;
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if (r < 0)
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return r;
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p = startswith(fdinfo, "mnt_id:");
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if (!p) {
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p = strstr(fdinfo, "\nmnt_id:");
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if (!p) /* The mnt_id field is a relatively new addition */
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return -EOPNOTSUPP;
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p += 8;
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}
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p += strspn(p, WHITESPACE);
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p[strcspn(p, WHITESPACE)] = 0;
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return safe_atoi(p, mnt_id);
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}
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int fd_is_mount_point(int fd, const char *filename, int flags) {
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_cleanup_free_ struct file_handle *h = NULL, *h_parent = NULL;
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int mount_id = -1, mount_id_parent = -1;
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bool nosupp = false, check_st_dev = true;
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struct stat a, b;
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int r;
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assert(fd >= 0);
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assert(filename);
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/* First we will try the name_to_handle_at() syscall, which
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* tells us the mount id and an opaque file "handle". It is
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* not supported everywhere though (kernel compile-time
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* option, not all file systems are hooked up). If it works
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* the mount id is usually good enough to tell us whether
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* something is a mount point.
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*
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* If that didn't work we will try to read the mount id from
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* /proc/self/fdinfo/<fd>. This is almost as good as
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* name_to_handle_at(), however, does not return the
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* opaque file handle. The opaque file handle is pretty useful
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* to detect the root directory, which we should always
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* consider a mount point. Hence we use this only as
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* fallback. Exporting the mnt_id in fdinfo is a pretty recent
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* kernel addition.
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*
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* As last fallback we do traditional fstat() based st_dev
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* comparisons. This is how things were traditionally done,
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* but unionfs breaks this since it exposes file
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* systems with a variety of st_dev reported. Also, btrfs
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* subvolumes have different st_dev, even though they aren't
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* real mounts of their own. */
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r = name_to_handle_at_loop(fd, filename, &h, &mount_id, flags);
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if (IN_SET(r, -ENOSYS, -EACCES, -EPERM, -EOVERFLOW, -EINVAL))
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/* This kernel does not support name_to_handle_at() at all (ENOSYS), or the syscall was blocked
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* (EACCES/EPERM; maybe through seccomp, because we are running inside of a container?), or the mount
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* point is not triggered yet (EOVERFLOW, think nfs4), or some general name_to_handle_at() flakiness
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* (EINVAL): fall back to simpler logic. */
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goto fallback_fdinfo;
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else if (r == -EOPNOTSUPP)
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/* This kernel or file system does not support name_to_handle_at(), hence let's see if the upper fs
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* supports it (in which case it is a mount point), otherwise fallback to the traditional stat()
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* logic */
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nosupp = true;
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else if (r < 0)
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return r;
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r = name_to_handle_at_loop(fd, "", &h_parent, &mount_id_parent, AT_EMPTY_PATH);
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if (r == -EOPNOTSUPP) {
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if (nosupp)
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/* Neither parent nor child do name_to_handle_at()? We have no choice but to fall back. */
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goto fallback_fdinfo;
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else
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/* The parent can't do name_to_handle_at() but the directory we are interested in can? If so,
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* it must be a mount point. */
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return 1;
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} else if (r < 0)
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return r;
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/* The parent can do name_to_handle_at() but the
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* directory we are interested in can't? If so, it
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* must be a mount point. */
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if (nosupp)
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return 1;
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/* If the file handle for the directory we are
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* interested in and its parent are identical, we
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* assume this is the root directory, which is a mount
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* point. */
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if (h->handle_bytes == h_parent->handle_bytes &&
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h->handle_type == h_parent->handle_type &&
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memcmp(h->f_handle, h_parent->f_handle, h->handle_bytes) == 0)
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return 1;
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return mount_id != mount_id_parent;
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fallback_fdinfo:
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r = fd_fdinfo_mnt_id(fd, filename, flags, &mount_id);
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if (IN_SET(r, -EOPNOTSUPP, -EACCES, -EPERM))
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goto fallback_fstat;
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if (r < 0)
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return r;
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r = fd_fdinfo_mnt_id(fd, "", AT_EMPTY_PATH, &mount_id_parent);
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if (r < 0)
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return r;
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if (mount_id != mount_id_parent)
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return 1;
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/* Hmm, so, the mount ids are the same. This leaves one
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* special case though for the root file system. For that,
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* let's see if the parent directory has the same inode as we
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* are interested in. Hence, let's also do fstat() checks now,
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* too, but avoid the st_dev comparisons, since they aren't
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* that useful on unionfs mounts. */
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check_st_dev = false;
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fallback_fstat:
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/* yay for fstatat() taking a different set of flags than the other
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* _at() above */
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if (flags & AT_SYMLINK_FOLLOW)
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flags &= ~AT_SYMLINK_FOLLOW;
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else
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flags |= AT_SYMLINK_NOFOLLOW;
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if (fstatat(fd, filename, &a, flags) < 0)
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return -errno;
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if (fstatat(fd, "", &b, AT_EMPTY_PATH) < 0)
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return -errno;
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/* A directory with same device and inode as its parent? Must
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* be the root directory */
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if (a.st_dev == b.st_dev &&
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a.st_ino == b.st_ino)
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return 1;
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return check_st_dev && (a.st_dev != b.st_dev);
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}
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/* flags can be AT_SYMLINK_FOLLOW or 0 */
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int path_is_mount_point(const char *t, const char *root, int flags) {
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_cleanup_free_ char *canonical = NULL;
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_cleanup_close_ int fd = -1;
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int r;
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assert(t);
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assert((flags & ~AT_SYMLINK_FOLLOW) == 0);
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if (path_equal(t, "/"))
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return 1;
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|
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/* we need to resolve symlinks manually, we can't just rely on
|
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* fd_is_mount_point() to do that for us; if we have a structure like
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* /bin -> /usr/bin/ and /usr is a mount point, then the parent that we
|
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* look at needs to be /usr, not /. */
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if (flags & AT_SYMLINK_FOLLOW) {
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r = chase_symlinks(t, root, CHASE_TRAIL_SLASH, &canonical);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
t = canonical;
|
||||
}
|
||||
|
||||
fd = open_parent(t, O_PATH|O_CLOEXEC, 0);
|
||||
if (fd < 0)
|
||||
return -errno;
|
||||
|
||||
return fd_is_mount_point(fd, last_path_component(t), flags);
|
||||
}
|
||||
|
||||
int path_get_mnt_id(const char *path, int *ret) {
|
||||
int r;
|
||||
|
||||
r = name_to_handle_at_loop(AT_FDCWD, path, NULL, ret, 0);
|
||||
if (IN_SET(r, -EOPNOTSUPP, -ENOSYS, -EACCES, -EPERM, -EOVERFLOW, -EINVAL)) /* kernel/fs don't support this, or seccomp blocks access, or untriggered mount, or name_to_handle_at() is flaky */
|
||||
return fd_fdinfo_mnt_id(AT_FDCWD, path, 0, ret);
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
int umount_recursive(const char *prefix, int flags) {
|
||||
bool again;
|
||||
int n = 0, r;
|
||||
@@ -601,86 +329,6 @@ int mount_move_root(const char *path) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
bool fstype_is_network(const char *fstype) {
|
||||
const char *x;
|
||||
|
||||
x = startswith(fstype, "fuse.");
|
||||
if (x)
|
||||
fstype = x;
|
||||
|
||||
return STR_IN_SET(fstype,
|
||||
"afs",
|
||||
"cifs",
|
||||
"smbfs",
|
||||
"sshfs",
|
||||
"ncpfs",
|
||||
"ncp",
|
||||
"nfs",
|
||||
"nfs4",
|
||||
"gfs",
|
||||
"gfs2",
|
||||
"glusterfs",
|
||||
"pvfs2", /* OrangeFS */
|
||||
"ocfs2",
|
||||
"lustre");
|
||||
}
|
||||
|
||||
bool fstype_is_api_vfs(const char *fstype) {
|
||||
return STR_IN_SET(fstype,
|
||||
"autofs",
|
||||
"bpf",
|
||||
"cgroup",
|
||||
"cgroup2",
|
||||
"configfs",
|
||||
"cpuset",
|
||||
"debugfs",
|
||||
"devpts",
|
||||
"devtmpfs",
|
||||
"efivarfs",
|
||||
"fusectl",
|
||||
"hugetlbfs",
|
||||
"mqueue",
|
||||
"proc",
|
||||
"pstore",
|
||||
"ramfs",
|
||||
"securityfs",
|
||||
"sysfs",
|
||||
"tmpfs",
|
||||
"tracefs");
|
||||
}
|
||||
|
||||
bool fstype_is_ro(const char *fstype) {
|
||||
/* All Linux file systems that are necessarily read-only */
|
||||
return STR_IN_SET(fstype,
|
||||
"DM_verity_hash",
|
||||
"iso9660",
|
||||
"squashfs");
|
||||
}
|
||||
|
||||
bool fstype_can_discard(const char *fstype) {
|
||||
return STR_IN_SET(fstype,
|
||||
"btrfs",
|
||||
"ext4",
|
||||
"vfat",
|
||||
"xfs");
|
||||
}
|
||||
|
||||
bool fstype_can_uid_gid(const char *fstype) {
|
||||
|
||||
/* All file systems that have a uid=/gid= mount option that fixates the owners of all files and directories,
|
||||
* current and future. */
|
||||
|
||||
return STR_IN_SET(fstype,
|
||||
"adfs",
|
||||
"fat",
|
||||
"hfs",
|
||||
"hpfs",
|
||||
"iso9660",
|
||||
"msdos",
|
||||
"ntfs",
|
||||
"vfat");
|
||||
}
|
||||
|
||||
int repeat_unmount(const char *path, int flags) {
|
||||
bool done = false;
|
||||
|
||||
@@ -852,37 +500,6 @@ int umount_verbose(const char *what) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
const char *mount_propagation_flags_to_string(unsigned long flags) {
|
||||
|
||||
switch (flags & (MS_SHARED|MS_SLAVE|MS_PRIVATE)) {
|
||||
case 0:
|
||||
return "";
|
||||
case MS_SHARED:
|
||||
return "shared";
|
||||
case MS_SLAVE:
|
||||
return "slave";
|
||||
case MS_PRIVATE:
|
||||
return "private";
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int mount_propagation_flags_from_string(const char *name, unsigned long *ret) {
|
||||
|
||||
if (isempty(name))
|
||||
*ret = 0;
|
||||
else if (streq(name, "shared"))
|
||||
*ret = MS_SHARED;
|
||||
else if (streq(name, "slave"))
|
||||
*ret = MS_SLAVE;
|
||||
else if (streq(name, "private"))
|
||||
*ret = MS_PRIVATE;
|
||||
else
|
||||
return -EINVAL;
|
||||
return 0;
|
||||
}
|
||||
|
||||
int mount_option_mangle(
|
||||
const char *options,
|
||||
unsigned long mount_flags,
|
||||
@@ -951,46 +568,3 @@ int mount_option_mangle(
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int dev_is_devtmpfs(void) {
|
||||
_cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
|
||||
int mount_id, r;
|
||||
char *e;
|
||||
|
||||
r = path_get_mnt_id("/dev", &mount_id);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
|
||||
if (!proc_self_mountinfo)
|
||||
return -errno;
|
||||
|
||||
(void) __fsetlocking(proc_self_mountinfo, FSETLOCKING_BYCALLER);
|
||||
|
||||
for (;;) {
|
||||
_cleanup_free_ char *line = NULL;
|
||||
int mid;
|
||||
|
||||
r = read_line(proc_self_mountinfo, LONG_LINE_MAX, &line);
|
||||
if (r < 0)
|
||||
return r;
|
||||
if (r == 0)
|
||||
break;
|
||||
|
||||
if (sscanf(line, "%i", &mid) != 1)
|
||||
continue;
|
||||
|
||||
if (mid != mount_id)
|
||||
continue;
|
||||
|
||||
e = strstr(line, " - ");
|
||||
if (!e)
|
||||
continue;
|
||||
|
||||
/* accept any name that starts with the currently expected type */
|
||||
if (startswith(e + 3, "devtmpfs"))
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
+1
-25
@@ -1,25 +1,12 @@
|
||||
/* SPDX-License-Identifier: LGPL-2.1+ */
|
||||
#pragma once
|
||||
|
||||
#include <fcntl.h>
|
||||
#include <mntent.h>
|
||||
#include <stdbool.h>
|
||||
#include <stdio.h>
|
||||
#include <sys/stat.h>
|
||||
#include <sys/types.h>
|
||||
|
||||
#include "macro.h"
|
||||
#include "missing.h"
|
||||
|
||||
int name_to_handle_at_loop(int fd, const char *path, struct file_handle **ret_handle, int *ret_mnt_id, int flags);
|
||||
|
||||
int path_get_mnt_id(const char *path, int *ret);
|
||||
|
||||
int fd_is_mount_point(int fd, const char *filename, int flags);
|
||||
int path_is_mount_point(const char *path, const char *root, int flags);
|
||||
|
||||
int repeat_unmount(const char *path, int flags);
|
||||
|
||||
int umount_recursive(const char *target, int flags);
|
||||
int bind_remount_recursive(const char *prefix, bool ro, char **blacklist);
|
||||
int bind_remount_recursive_with_mountinfo(const char *prefix, bool ro, char **blacklist, FILE *proc_self_mountinfo);
|
||||
@@ -29,14 +16,6 @@ int mount_move_root(const char *path);
|
||||
DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent);
|
||||
#define _cleanup_endmntent_ _cleanup_(endmntentp)
|
||||
|
||||
bool fstype_is_network(const char *fstype);
|
||||
bool fstype_is_api_vfs(const char *fstype);
|
||||
bool fstype_is_ro(const char *fsype);
|
||||
bool fstype_can_discard(const char *fstype);
|
||||
bool fstype_can_uid_gid(const char *fstype);
|
||||
|
||||
const char* mode_to_inaccessible_node(mode_t mode);
|
||||
|
||||
int mount_verbose(
|
||||
int error_log_level,
|
||||
const char *what,
|
||||
@@ -46,13 +25,10 @@ int mount_verbose(
|
||||
const char *options);
|
||||
int umount_verbose(const char *where);
|
||||
|
||||
const char *mount_propagation_flags_to_string(unsigned long flags);
|
||||
int mount_propagation_flags_from_string(const char *name, unsigned long *ret);
|
||||
|
||||
int mount_option_mangle(
|
||||
const char *options,
|
||||
unsigned long mount_flags,
|
||||
unsigned long *ret_mount_flags,
|
||||
char **ret_remaining_options);
|
||||
|
||||
int dev_is_devtmpfs(void);
|
||||
const char* mode_to_inaccessible_node(mode_t mode);
|
||||
|
||||
@@ -0,0 +1,444 @@
|
||||
/* SPDX-License-Identifier: LGPL-2.1+ */
|
||||
|
||||
#include <errno.h>
|
||||
#include <fcntl.h>
|
||||
#include <stdio_ext.h>
|
||||
#include <sys/mount.h>
|
||||
|
||||
#include "alloc-util.h"
|
||||
#include "fd-util.h"
|
||||
#include "fileio.h"
|
||||
#include "fs-util.h"
|
||||
#include "missing.h"
|
||||
#include "mountpoint-util.h"
|
||||
#include "parse-util.h"
|
||||
#include "path-util.h"
|
||||
#include "stdio-util.h"
|
||||
#include "strv.h"
|
||||
|
||||
/* This is the original MAX_HANDLE_SZ definition from the kernel, when the API was introduced. We use that in place of
|
||||
* any more currently defined value to future-proof things: if the size is increased in the API headers, and our code
|
||||
* is recompiled then it would cease working on old kernels, as those refuse any sizes larger than this value with
|
||||
* EINVAL right-away. Hence, let's disconnect ourselves from any such API changes, and stick to the original definition
|
||||
* from when it was introduced. We use it as a start value only anyway (see below), and hence should be able to deal
|
||||
* with large file handles anyway. */
|
||||
#define ORIGINAL_MAX_HANDLE_SZ 128
|
||||
|
||||
int name_to_handle_at_loop(
|
||||
int fd,
|
||||
const char *path,
|
||||
struct file_handle **ret_handle,
|
||||
int *ret_mnt_id,
|
||||
int flags) {
|
||||
|
||||
_cleanup_free_ struct file_handle *h = NULL;
|
||||
size_t n = ORIGINAL_MAX_HANDLE_SZ;
|
||||
|
||||
/* We need to invoke name_to_handle_at() in a loop, given that it might return EOVERFLOW when the specified
|
||||
* buffer is too small. Note that in contrast to what the docs might suggest, MAX_HANDLE_SZ is only good as a
|
||||
* start value, it is not an upper bound on the buffer size required.
|
||||
*
|
||||
* This improves on raw name_to_handle_at() also in one other regard: ret_handle and ret_mnt_id can be passed
|
||||
* as NULL if there's no interest in either. */
|
||||
|
||||
for (;;) {
|
||||
int mnt_id = -1;
|
||||
|
||||
h = malloc0(offsetof(struct file_handle, f_handle) + n);
|
||||
if (!h)
|
||||
return -ENOMEM;
|
||||
|
||||
h->handle_bytes = n;
|
||||
|
||||
if (name_to_handle_at(fd, path, h, &mnt_id, flags) >= 0) {
|
||||
|
||||
if (ret_handle)
|
||||
*ret_handle = TAKE_PTR(h);
|
||||
|
||||
if (ret_mnt_id)
|
||||
*ret_mnt_id = mnt_id;
|
||||
|
||||
return 0;
|
||||
}
|
||||
if (errno != EOVERFLOW)
|
||||
return -errno;
|
||||
|
||||
if (!ret_handle && ret_mnt_id && mnt_id >= 0) {
|
||||
|
||||
/* As it appears, name_to_handle_at() fills in mnt_id even when it returns EOVERFLOW when the
|
||||
* buffer is too small, but that's undocumented. Hence, let's make use of this if it appears to
|
||||
* be filled in, and the caller was interested in only the mount ID an nothing else. */
|
||||
|
||||
*ret_mnt_id = mnt_id;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* If name_to_handle_at() didn't increase the byte size, then this EOVERFLOW is caused by something
|
||||
* else (apparently EOVERFLOW is returned for untriggered nfs4 mounts sometimes), not by the too small
|
||||
* buffer. In that case propagate EOVERFLOW */
|
||||
if (h->handle_bytes <= n)
|
||||
return -EOVERFLOW;
|
||||
|
||||
/* The buffer was too small. Size the new buffer by what name_to_handle_at() returned. */
|
||||
n = h->handle_bytes;
|
||||
if (offsetof(struct file_handle, f_handle) + n < n) /* check for addition overflow */
|
||||
return -EOVERFLOW;
|
||||
|
||||
h = mfree(h);
|
||||
}
|
||||
}
|
||||
|
||||
static int fd_fdinfo_mnt_id(int fd, const char *filename, int flags, int *mnt_id) {
|
||||
char path[STRLEN("/proc/self/fdinfo/") + DECIMAL_STR_MAX(int)];
|
||||
_cleanup_free_ char *fdinfo = NULL;
|
||||
_cleanup_close_ int subfd = -1;
|
||||
char *p;
|
||||
int r;
|
||||
|
||||
if ((flags & AT_EMPTY_PATH) && isempty(filename))
|
||||
xsprintf(path, "/proc/self/fdinfo/%i", fd);
|
||||
else {
|
||||
subfd = openat(fd, filename, O_CLOEXEC|O_PATH);
|
||||
if (subfd < 0)
|
||||
return -errno;
|
||||
|
||||
xsprintf(path, "/proc/self/fdinfo/%i", subfd);
|
||||
}
|
||||
|
||||
r = read_full_file(path, &fdinfo, NULL);
|
||||
if (r == -ENOENT) /* The fdinfo directory is a relatively new addition */
|
||||
return -EOPNOTSUPP;
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
p = startswith(fdinfo, "mnt_id:");
|
||||
if (!p) {
|
||||
p = strstr(fdinfo, "\nmnt_id:");
|
||||
if (!p) /* The mnt_id field is a relatively new addition */
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
p += 8;
|
||||
}
|
||||
|
||||
p += strspn(p, WHITESPACE);
|
||||
p[strcspn(p, WHITESPACE)] = 0;
|
||||
|
||||
return safe_atoi(p, mnt_id);
|
||||
}
|
||||
|
||||
int fd_is_mount_point(int fd, const char *filename, int flags) {
|
||||
_cleanup_free_ struct file_handle *h = NULL, *h_parent = NULL;
|
||||
int mount_id = -1, mount_id_parent = -1;
|
||||
bool nosupp = false, check_st_dev = true;
|
||||
struct stat a, b;
|
||||
int r;
|
||||
|
||||
assert(fd >= 0);
|
||||
assert(filename);
|
||||
|
||||
/* First we will try the name_to_handle_at() syscall, which
|
||||
* tells us the mount id and an opaque file "handle". It is
|
||||
* not supported everywhere though (kernel compile-time
|
||||
* option, not all file systems are hooked up). If it works
|
||||
* the mount id is usually good enough to tell us whether
|
||||
* something is a mount point.
|
||||
*
|
||||
* If that didn't work we will try to read the mount id from
|
||||
* /proc/self/fdinfo/<fd>. This is almost as good as
|
||||
* name_to_handle_at(), however, does not return the
|
||||
* opaque file handle. The opaque file handle is pretty useful
|
||||
* to detect the root directory, which we should always
|
||||
* consider a mount point. Hence we use this only as
|
||||
* fallback. Exporting the mnt_id in fdinfo is a pretty recent
|
||||
* kernel addition.
|
||||
*
|
||||
* As last fallback we do traditional fstat() based st_dev
|
||||
* comparisons. This is how things were traditionally done,
|
||||
* but unionfs breaks this since it exposes file
|
||||
* systems with a variety of st_dev reported. Also, btrfs
|
||||
* subvolumes have different st_dev, even though they aren't
|
||||
* real mounts of their own. */
|
||||
|
||||
r = name_to_handle_at_loop(fd, filename, &h, &mount_id, flags);
|
||||
if (IN_SET(r, -ENOSYS, -EACCES, -EPERM, -EOVERFLOW, -EINVAL))
|
||||
/* This kernel does not support name_to_handle_at() at all (ENOSYS), or the syscall was blocked
|
||||
* (EACCES/EPERM; maybe through seccomp, because we are running inside of a container?), or the mount
|
||||
* point is not triggered yet (EOVERFLOW, think nfs4), or some general name_to_handle_at() flakiness
|
||||
* (EINVAL): fall back to simpler logic. */
|
||||
goto fallback_fdinfo;
|
||||
else if (r == -EOPNOTSUPP)
|
||||
/* This kernel or file system does not support name_to_handle_at(), hence let's see if the upper fs
|
||||
* supports it (in which case it is a mount point), otherwise fallback to the traditional stat()
|
||||
* logic */
|
||||
nosupp = true;
|
||||
else if (r < 0)
|
||||
return r;
|
||||
|
||||
r = name_to_handle_at_loop(fd, "", &h_parent, &mount_id_parent, AT_EMPTY_PATH);
|
||||
if (r == -EOPNOTSUPP) {
|
||||
if (nosupp)
|
||||
/* Neither parent nor child do name_to_handle_at()? We have no choice but to fall back. */
|
||||
goto fallback_fdinfo;
|
||||
else
|
||||
/* The parent can't do name_to_handle_at() but the directory we are interested in can? If so,
|
||||
* it must be a mount point. */
|
||||
return 1;
|
||||
} else if (r < 0)
|
||||
return r;
|
||||
|
||||
/* The parent can do name_to_handle_at() but the
|
||||
* directory we are interested in can't? If so, it
|
||||
* must be a mount point. */
|
||||
if (nosupp)
|
||||
return 1;
|
||||
|
||||
/* If the file handle for the directory we are
|
||||
* interested in and its parent are identical, we
|
||||
* assume this is the root directory, which is a mount
|
||||
* point. */
|
||||
|
||||
if (h->handle_bytes == h_parent->handle_bytes &&
|
||||
h->handle_type == h_parent->handle_type &&
|
||||
memcmp(h->f_handle, h_parent->f_handle, h->handle_bytes) == 0)
|
||||
return 1;
|
||||
|
||||
return mount_id != mount_id_parent;
|
||||
|
||||
fallback_fdinfo:
|
||||
r = fd_fdinfo_mnt_id(fd, filename, flags, &mount_id);
|
||||
if (IN_SET(r, -EOPNOTSUPP, -EACCES, -EPERM))
|
||||
goto fallback_fstat;
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = fd_fdinfo_mnt_id(fd, "", AT_EMPTY_PATH, &mount_id_parent);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
if (mount_id != mount_id_parent)
|
||||
return 1;
|
||||
|
||||
/* Hmm, so, the mount ids are the same. This leaves one
|
||||
* special case though for the root file system. For that,
|
||||
* let's see if the parent directory has the same inode as we
|
||||
* are interested in. Hence, let's also do fstat() checks now,
|
||||
* too, but avoid the st_dev comparisons, since they aren't
|
||||
* that useful on unionfs mounts. */
|
||||
check_st_dev = false;
|
||||
|
||||
fallback_fstat:
|
||||
/* yay for fstatat() taking a different set of flags than the other
|
||||
* _at() above */
|
||||
if (flags & AT_SYMLINK_FOLLOW)
|
||||
flags &= ~AT_SYMLINK_FOLLOW;
|
||||
else
|
||||
flags |= AT_SYMLINK_NOFOLLOW;
|
||||
if (fstatat(fd, filename, &a, flags) < 0)
|
||||
return -errno;
|
||||
|
||||
if (fstatat(fd, "", &b, AT_EMPTY_PATH) < 0)
|
||||
return -errno;
|
||||
|
||||
/* A directory with same device and inode as its parent? Must
|
||||
* be the root directory */
|
||||
if (a.st_dev == b.st_dev &&
|
||||
a.st_ino == b.st_ino)
|
||||
return 1;
|
||||
|
||||
return check_st_dev && (a.st_dev != b.st_dev);
|
||||
}
|
||||
|
||||
/* flags can be AT_SYMLINK_FOLLOW or 0 */
|
||||
int path_is_mount_point(const char *t, const char *root, int flags) {
|
||||
_cleanup_free_ char *canonical = NULL;
|
||||
_cleanup_close_ int fd = -1;
|
||||
int r;
|
||||
|
||||
assert(t);
|
||||
assert((flags & ~AT_SYMLINK_FOLLOW) == 0);
|
||||
|
||||
if (path_equal(t, "/"))
|
||||
return 1;
|
||||
|
||||
/* we need to resolve symlinks manually, we can't just rely on
|
||||
* fd_is_mount_point() to do that for us; if we have a structure like
|
||||
* /bin -> /usr/bin/ and /usr is a mount point, then the parent that we
|
||||
* look at needs to be /usr, not /. */
|
||||
if (flags & AT_SYMLINK_FOLLOW) {
|
||||
r = chase_symlinks(t, root, CHASE_TRAIL_SLASH, &canonical);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
t = canonical;
|
||||
}
|
||||
|
||||
fd = open_parent(t, O_PATH|O_CLOEXEC, 0);
|
||||
if (fd < 0)
|
||||
return -errno;
|
||||
|
||||
return fd_is_mount_point(fd, last_path_component(t), flags);
|
||||
}
|
||||
|
||||
int path_get_mnt_id(const char *path, int *ret) {
|
||||
int r;
|
||||
|
||||
r = name_to_handle_at_loop(AT_FDCWD, path, NULL, ret, 0);
|
||||
if (IN_SET(r, -EOPNOTSUPP, -ENOSYS, -EACCES, -EPERM, -EOVERFLOW, -EINVAL)) /* kernel/fs don't support this, or seccomp blocks access, or untriggered mount, or name_to_handle_at() is flaky */
|
||||
return fd_fdinfo_mnt_id(AT_FDCWD, path, 0, ret);
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
bool fstype_is_network(const char *fstype) {
|
||||
const char *x;
|
||||
|
||||
x = startswith(fstype, "fuse.");
|
||||
if (x)
|
||||
fstype = x;
|
||||
|
||||
return STR_IN_SET(fstype,
|
||||
"afs",
|
||||
"cifs",
|
||||
"smbfs",
|
||||
"sshfs",
|
||||
"ncpfs",
|
||||
"ncp",
|
||||
"nfs",
|
||||
"nfs4",
|
||||
"gfs",
|
||||
"gfs2",
|
||||
"glusterfs",
|
||||
"pvfs2", /* OrangeFS */
|
||||
"ocfs2",
|
||||
"lustre");
|
||||
}
|
||||
|
||||
bool fstype_is_api_vfs(const char *fstype) {
|
||||
return STR_IN_SET(fstype,
|
||||
"autofs",
|
||||
"bpf",
|
||||
"cgroup",
|
||||
"cgroup2",
|
||||
"configfs",
|
||||
"cpuset",
|
||||
"debugfs",
|
||||
"devpts",
|
||||
"devtmpfs",
|
||||
"efivarfs",
|
||||
"fusectl",
|
||||
"hugetlbfs",
|
||||
"mqueue",
|
||||
"proc",
|
||||
"pstore",
|
||||
"ramfs",
|
||||
"securityfs",
|
||||
"sysfs",
|
||||
"tmpfs",
|
||||
"tracefs");
|
||||
}
|
||||
|
||||
bool fstype_is_ro(const char *fstype) {
|
||||
/* All Linux file systems that are necessarily read-only */
|
||||
return STR_IN_SET(fstype,
|
||||
"DM_verity_hash",
|
||||
"iso9660",
|
||||
"squashfs");
|
||||
}
|
||||
|
||||
bool fstype_can_discard(const char *fstype) {
|
||||
return STR_IN_SET(fstype,
|
||||
"btrfs",
|
||||
"ext4",
|
||||
"vfat",
|
||||
"xfs");
|
||||
}
|
||||
|
||||
bool fstype_can_uid_gid(const char *fstype) {
|
||||
|
||||
/* All file systems that have a uid=/gid= mount option that fixates the owners of all files and directories,
|
||||
* current and future. */
|
||||
|
||||
return STR_IN_SET(fstype,
|
||||
"adfs",
|
||||
"fat",
|
||||
"hfs",
|
||||
"hpfs",
|
||||
"iso9660",
|
||||
"msdos",
|
||||
"ntfs",
|
||||
"vfat");
|
||||
}
|
||||
|
||||
int dev_is_devtmpfs(void) {
|
||||
_cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
|
||||
int mount_id, r;
|
||||
char *e;
|
||||
|
||||
r = path_get_mnt_id("/dev", &mount_id);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
|
||||
if (!proc_self_mountinfo)
|
||||
return -errno;
|
||||
|
||||
(void) __fsetlocking(proc_self_mountinfo, FSETLOCKING_BYCALLER);
|
||||
|
||||
for (;;) {
|
||||
_cleanup_free_ char *line = NULL;
|
||||
int mid;
|
||||
|
||||
r = read_line(proc_self_mountinfo, LONG_LINE_MAX, &line);
|
||||
if (r < 0)
|
||||
return r;
|
||||
if (r == 0)
|
||||
break;
|
||||
|
||||
if (sscanf(line, "%i", &mid) != 1)
|
||||
continue;
|
||||
|
||||
if (mid != mount_id)
|
||||
continue;
|
||||
|
||||
e = strstr(line, " - ");
|
||||
if (!e)
|
||||
continue;
|
||||
|
||||
/* accept any name that starts with the currently expected type */
|
||||
if (startswith(e + 3, "devtmpfs"))
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
const char *mount_propagation_flags_to_string(unsigned long flags) {
|
||||
|
||||
switch (flags & (MS_SHARED|MS_SLAVE|MS_PRIVATE)) {
|
||||
case 0:
|
||||
return "";
|
||||
case MS_SHARED:
|
||||
return "shared";
|
||||
case MS_SLAVE:
|
||||
return "slave";
|
||||
case MS_PRIVATE:
|
||||
return "private";
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int mount_propagation_flags_from_string(const char *name, unsigned long *ret) {
|
||||
|
||||
if (isempty(name))
|
||||
*ret = 0;
|
||||
else if (streq(name, "shared"))
|
||||
*ret = MS_SHARED;
|
||||
else if (streq(name, "slave"))
|
||||
*ret = MS_SLAVE;
|
||||
else if (streq(name, "private"))
|
||||
*ret = MS_PRIVATE;
|
||||
else
|
||||
return -EINVAL;
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,24 @@
|
||||
/* SPDX-License-Identifier: LGPL-2.1+ */
|
||||
#pragma once
|
||||
|
||||
#include <fcntl.h>
|
||||
#include <stdbool.h>
|
||||
#include <sys/types.h>
|
||||
|
||||
int name_to_handle_at_loop(int fd, const char *path, struct file_handle **ret_handle, int *ret_mnt_id, int flags);
|
||||
|
||||
int path_get_mnt_id(const char *path, int *ret);
|
||||
|
||||
int fd_is_mount_point(int fd, const char *filename, int flags);
|
||||
int path_is_mount_point(const char *path, const char *root, int flags);
|
||||
|
||||
bool fstype_is_network(const char *fstype);
|
||||
bool fstype_is_api_vfs(const char *fstype);
|
||||
bool fstype_is_ro(const char *fsype);
|
||||
bool fstype_can_discard(const char *fstype);
|
||||
bool fstype_can_uid_gid(const char *fstype);
|
||||
|
||||
int dev_is_devtmpfs(void);
|
||||
|
||||
const char *mount_propagation_flags_to_string(unsigned long flags);
|
||||
int mount_propagation_flags_from_string(const char *name, unsigned long *ret);
|
||||
+1
-1
@@ -15,7 +15,7 @@
|
||||
#include "fd-util.h"
|
||||
#include "log.h"
|
||||
#include "macro.h"
|
||||
#include "mount-util.h"
|
||||
#include "mountpoint-util.h"
|
||||
#include "path-util.h"
|
||||
#include "rm-rf.h"
|
||||
#include "stat-util.h"
|
||||
|
||||
Reference in New Issue
Block a user