16556981419

Committed 27 Jul 2025 10:50PM UTC coverage: 72.164% (-0.009%) from 72.173%

Build # 16556981419

Build Type

push

github

Committed by

bluca

Commit Message

include: update kernel headers from v6.16-rc7

- netfilter changes in v6.16-rc1 were reverted,
- vm_sockets.h now includes sys/socket.h, hence our workaround is not
  necessary anymore.

Run Details

302524 of 419218 relevant lines covered (72.16%)

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Source File
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93.58

/src/basic/stat-util.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <fcntl.h>
#include <linux/magic.h>
#include <sys/statvfs.h>
#include <unistd.h>

#include "alloc-util.h"
#include "chase.h"
#include "dirent-util.h"
#include "errno-util.h"
#include "fd-util.h"
#include "filesystems.h"
#include "fs-util.h"
#include "hash-funcs.h"
#include "log.h"
#include "mountpoint-util.h"
#include "path-util.h"
#include "siphash24.h"
#include "stat-util.h"
#include "string-util.h"
#include "time-util.h"

static int verify_stat_at(
                int fd,
                const char *path,
                bool follow,
                int (*verify_func)(const struct stat *st),
                bool verify) {

        struct stat st;
        int r;

        assert(fd >= 0 || fd == AT_FDCWD);
        assert(!isempty(path) || !follow);
        assert(verify_func);

        if (fstatat(fd, strempty(path), &st,
                    (isempty(path) ? AT_EMPTY_PATH : 0) | (follow ? 0 : AT_SYMLINK_NOFOLLOW)) < 0)
                return -errno;

        r = verify_func(&st);
        return verify ? r : r >= 0;
}

int stat_verify_regular(const struct stat *st) {
        assert(st);

        /* Checks whether the specified stat() structure refers to a regular file. If not returns an
         * appropriate error code. */

        if (S_ISDIR(st->st_mode))
                return -EISDIR;

        if (S_ISLNK(st->st_mode))
                return -ELOOP;

        if (!S_ISREG(st->st_mode))
                return -EBADFD;

        return 0;
}

int verify_regular_at(int fd, const char *path, bool follow) {
        return verify_stat_at(fd, path, follow, stat_verify_regular, true);
}

int fd_verify_regular(int fd) {
        assert(fd >= 0);
        return verify_regular_at(fd, NULL, false);
}

int stat_verify_directory(const struct stat *st) {
        assert(st);

        if (S_ISLNK(st->st_mode))
                return -ELOOP;

        if (!S_ISDIR(st->st_mode))
                return -ENOTDIR;

        return 0;
}

int fd_verify_directory(int fd) {
        assert(fd >= 0);
        return verify_stat_at(fd, NULL, false, stat_verify_directory, true);
}

int is_dir_at(int fd, const char *path, bool follow) {
        return verify_stat_at(fd, path, follow, stat_verify_directory, false);
}

int is_dir(const char *path, bool follow) {
        assert(!isempty(path));
        return is_dir_at(AT_FDCWD, path, follow);
}

int stat_verify_symlink(const struct stat *st) {
        assert(st);

        if (S_ISDIR(st->st_mode))
                return -EISDIR;

        if (!S_ISLNK(st->st_mode))
                return -ENOLINK;

        return 0;
}

int is_symlink(const char *path) {
        assert(!isempty(path));
        return verify_stat_at(AT_FDCWD, path, false, stat_verify_symlink, false);
}

int stat_verify_linked(const struct stat *st) {
        assert(st);

        if (st->st_nlink <= 0)
                return -EIDRM; /* recognizable error. */

        return 0;
}

int fd_verify_linked(int fd) {
        assert(fd >= 0);
        return verify_stat_at(fd, NULL, false, stat_verify_linked, true);
}

int stat_verify_device_node(const struct stat *st) {
        assert(st);

        if (S_ISLNK(st->st_mode))
                return -ELOOP;

        if (S_ISDIR(st->st_mode))
                return -EISDIR;

        if (!S_ISBLK(st->st_mode) && !S_ISCHR(st->st_mode))
                return -ENOTTY;

        return 0;
}

int is_device_node(const char *path) {
        assert(!isempty(path));
        return verify_stat_at(AT_FDCWD, path, false, stat_verify_device_node, false);
}

int dir_is_empty_at(int dir_fd, const char *path, bool ignore_hidden_or_backup) {
        _cleanup_close_ int fd = -EBADF;
        struct dirent *buf;
        size_t m;

        fd = xopenat(dir_fd, path, O_DIRECTORY|O_CLOEXEC);
        if (fd < 0)
                return fd;

        /* Allocate space for at least 3 full dirents, since every dir has at least two entries ("."  +
         * ".."), and only once we have seen if there's a third we know whether the dir is empty or not. If
         * 'ignore_hidden_or_backup' is true we'll allocate a bit more, since we might skip over a bunch of
         * entries that we end up ignoring. */
        m = (ignore_hidden_or_backup ? 16 : 3) * DIRENT_SIZE_MAX;
        buf = alloca(m);

        for (;;) {
                struct dirent *de;
                ssize_t n;

                n = getdents64(fd, buf, m);
                if (n < 0)
                        return -errno;
                if (n == 0)
                        break;

                assert((size_t) n <= m);
                msan_unpoison(buf, n);

                FOREACH_DIRENT_IN_BUFFER(de, buf, n)
                        if (!(ignore_hidden_or_backup ? hidden_or_backup_file(de->d_name) : dot_or_dot_dot(de->d_name)))
                                return 0;
        }

        return 1;
}

bool stat_may_be_dev_null(struct stat *st) {
        assert(st);

        /* We don't want to hardcode the major/minor of /dev/null, hence we do a simpler "is this a character
         * device node?" check. */

        return S_ISCHR(st->st_mode);
}

bool stat_is_empty(struct stat *st) {
        assert(st);

        return S_ISREG(st->st_mode) && st->st_size <= 0;
}

int null_or_empty_path_with_root(const char *fn, const char *root) {
        struct stat st;
        int r;

        assert(fn);

        /* A symlink to /dev/null or an empty file?
         * When looking under root_dir, we can't expect /dev/ to be mounted,
         * so let's see if the path is a (possibly dangling) symlink to /dev/null. */

        if (path_equal(path_startswith(fn, root ?: "/"), "dev/null"))
                return true;

        r = chase_and_stat(fn, root, CHASE_PREFIX_ROOT, NULL, &st);
        if (r < 0)
                return r;

        return null_or_empty(&st);
}

int fd_is_read_only_fs(int fd) {
        struct statfs st;

        assert(fd >= 0);

        if (fstatfs(fd, &st) < 0)
                return -errno;

        if (st.f_flags & ST_RDONLY)
                return true;

        if (is_network_fs(&st)) {
                /* On NFS, fstatfs() might not reflect whether we can actually write to the remote share.
                 * Let's try again with access(W_OK) which is more reliable, at least sometimes. */
                if (access_fd(fd, W_OK) == -EROFS)
                        return true;
        }

        return false;
}

int path_is_read_only_fs(const char *path) {
        _cleanup_close_ int fd = -EBADF;

        assert(path);

        fd = open(path, O_CLOEXEC | O_PATH);
        if (fd < 0)
                return -errno;

        return fd_is_read_only_fs(fd);
}

int inode_same_at(int fda, const char *filea, int fdb, const char *fileb, int flags) {
        struct stat sta, stb;
        int r;

        assert(fda >= 0 || fda == AT_FDCWD);
        assert(fdb >= 0 || fdb == AT_FDCWD);
        assert((flags & ~(AT_EMPTY_PATH|AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT)) == 0);

        /* Refuse an unset filea or fileb early unless AT_EMPTY_PATH is set */
        if ((isempty(filea) || isempty(fileb)) && !FLAGS_SET(flags, AT_EMPTY_PATH))
                return -EINVAL;

        /* Shortcut: comparing the same fd with itself means we can return true */
        if (fda >= 0 && fda == fdb && isempty(filea) && isempty(fileb) && FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW))
                return true;

        _cleanup_close_ int pin_a = -EBADF, pin_b = -EBADF;
        if (!FLAGS_SET(flags, AT_NO_AUTOMOUNT)) {
                /* Let's try to use the name_to_handle_at() AT_HANDLE_FID API to identify identical
                 * inodes. We have to issue multiple calls on the same file for that (first, to acquire the
                 * FID, and then to check if .st_dev is actually the same). Hence let's pin the inode in
                 * between via O_PATH, unless we already have an fd for it. */

                if (!isempty(filea)) {
                        pin_a = openat(fda, filea, O_PATH|O_CLOEXEC|(FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW) ? O_NOFOLLOW : 0));
                        if (pin_a < 0)
                                return -errno;

                        fda = pin_a;
                        filea = NULL;
                        flags |= AT_EMPTY_PATH;
                }

                if (!isempty(fileb)) {
                        pin_b = openat(fdb, fileb, O_PATH|O_CLOEXEC|(FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW) ? O_NOFOLLOW : 0));
                        if (pin_b < 0)
                                return -errno;

                        fdb = pin_b;
                        fileb = NULL;
                        flags |= AT_EMPTY_PATH;
                }

                int ntha_flags = at_flags_normalize_follow(flags) & (AT_EMPTY_PATH|AT_SYMLINK_FOLLOW);
                _cleanup_free_ struct file_handle *ha = NULL, *hb = NULL;
                int mntida = -1, mntidb = -1;

                r = name_to_handle_at_try_fid(
                                fda,
                                filea,
                                &ha,
                                &mntida,
                                ntha_flags);
                if (r < 0) {
                        if (is_name_to_handle_at_fatal_error(r))
                                return r;

                        goto fallback;
                }

                r = name_to_handle_at_try_fid(
                                fdb,
                                fileb,
                                &hb,
                                &mntidb,
                                ntha_flags);
                if (r < 0) {
                        if (is_name_to_handle_at_fatal_error(r))
                                return r;

                        goto fallback;
                }

                /* Now compare the two file handles */
                if (!file_handle_equal(ha, hb))
                        return false;

                /* If the file handles are the same and they come from the same mount ID? Great, then we are
                 * good, they are definitely the same */
                if (mntida == mntidb)
                        return true;

                /* File handles are the same, they are not on the same mount id. This might either be because
                 * they are on two entirely different file systems, that just happen to have the same FIDs
                 * (because they originally where created off the same disk images), or it could be because
                 * they are located on two distinct bind mounts of the same fs. To check that, let's look at
                 * .st_rdev of the inode. We simply reuse the fallback codepath for that, since it checks
                 * exactly that (it checks slightly more, but we don't care.) */
        }

fallback:
        if (fstatat(fda, strempty(filea), &sta, flags) < 0)
                return log_debug_errno(errno, "Cannot stat %s: %m", strna(filea));

        if (fstatat(fdb, strempty(fileb), &stb, flags) < 0)
                return log_debug_errno(errno, "Cannot stat %s: %m", strna(fileb));

        return stat_inode_same(&sta, &stb);
}

bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) {
        assert(s);
        assert_cc(sizeof(statfs_f_type_t) >= sizeof(s->f_type));

        return F_TYPE_EQUAL(s->f_type, magic_value);
}

int is_fs_type_at(int dir_fd, const char *path, statfs_f_type_t magic_value) {
        struct statfs s;
        int r;

        r = xstatfsat(dir_fd, path, &s);
        if (r < 0)
                return r;

        return is_fs_type(&s, magic_value);
}

bool is_temporary_fs(const struct statfs *s) {
        return fs_in_group(s, FILESYSTEM_SET_TEMPORARY);
}

bool is_network_fs(const struct statfs *s) {
        return fs_in_group(s, FILESYSTEM_SET_NETWORK);
}

int fd_is_temporary_fs(int fd) {
        struct statfs s;

        if (fstatfs(fd, &s) < 0)
                return -errno;

        return is_temporary_fs(&s);
}

int fd_is_network_fs(int fd) {
        struct statfs s;

        if (fstatfs(fd, &s) < 0)
                return -errno;

        return is_network_fs(&s);
}

int path_is_temporary_fs(const char *path) {
        struct statfs s;

        if (statfs(path, &s) < 0)
                return -errno;

        return is_temporary_fs(&s);
}

int path_is_network_fs(const char *path) {
        struct statfs s;

        if (statfs(path, &s) < 0)
                return -errno;

        return is_network_fs(&s);
}

int proc_mounted(void) {
        int r;

        /* A quick check of procfs is properly mounted */

        r = path_is_fs_type("/proc/", PROC_SUPER_MAGIC);
        if (r == -ENOENT) /* not mounted at all */
                return false;

        return r;
}

bool stat_inode_same(const struct stat *a, const struct stat *b) {

        /* Returns if the specified stat structure references the same (though possibly modified) inode. Does
         * a thorough check, comparing inode nr, backing device and if the inode is still of the same type. */

        return stat_is_set(a) && stat_is_set(b) &&
                ((a->st_mode ^ b->st_mode) & S_IFMT) == 0 &&  /* same inode type */
                a->st_dev == b->st_dev &&
                a->st_ino == b->st_ino;
}

bool stat_inode_unmodified(const struct stat *a, const struct stat *b) {

        /* Returns if the specified stat structures reference the same, unmodified inode. This check tries to
         * be reasonably careful when detecting changes: we check both inode and mtime, to cater for file
         * systems where mtimes are fixed to 0 (think: ostree/nixos type installations). We also check file
         * size, backing device, inode type and if this refers to a device not the major/minor.
         *
         * Note that we don't care if file attributes such as ownership or access mode change, this here is
         * about contents of the file. The purpose here is to detect file contents changes, and nothing
         * else. */

        return stat_inode_same(a, b) &&
                a->st_mtim.tv_sec == b->st_mtim.tv_sec &&
                a->st_mtim.tv_nsec == b->st_mtim.tv_nsec &&
                (!S_ISREG(a->st_mode) || a->st_size == b->st_size) && /* if regular file, compare file size */
                (!(S_ISCHR(a->st_mode) || S_ISBLK(a->st_mode)) || a->st_rdev == b->st_rdev); /* if device node, also compare major/minor, because we can */
}

bool statx_inode_same(const struct statx *a, const struct statx *b) {

        /* Same as stat_inode_same() but for struct statx */

        return statx_is_set(a) && statx_is_set(b) &&
                FLAGS_SET(a->stx_mask, STATX_TYPE|STATX_INO) && FLAGS_SET(b->stx_mask, STATX_TYPE|STATX_INO) &&
                ((a->stx_mode ^ b->stx_mode) & S_IFMT) == 0 &&
                a->stx_dev_major == b->stx_dev_major &&
                a->stx_dev_minor == b->stx_dev_minor &&
                a->stx_ino == b->stx_ino;
}

bool statx_mount_same(const struct statx *a, const struct statx *b) {
        if (!statx_is_set(a) || !statx_is_set(b))
                return false;

        /* if we have the mount ID, that's all we need */
        if (FLAGS_SET(a->stx_mask, STATX_MNT_ID) && FLAGS_SET(b->stx_mask, STATX_MNT_ID))
                return a->stx_mnt_id == b->stx_mnt_id;

        /* Otherwise, major/minor of backing device must match */
        return a->stx_dev_major == b->stx_dev_major &&
                a->stx_dev_minor == b->stx_dev_minor;
}

int xstatfsat(int dir_fd, const char *path, struct statfs *ret) {
        _cleanup_close_ int fd = -EBADF;

        assert(dir_fd >= 0 || dir_fd == AT_FDCWD);
        assert(ret);

        if (!isempty(path)) {
                fd = xopenat(dir_fd, path, O_PATH|O_CLOEXEC|O_NOCTTY);
                if (fd < 0)
                        return fd;
                dir_fd = fd;
        }

        return RET_NERRNO(fstatfs(dir_fd, ret));
}

usec_t statx_timestamp_load(const struct statx_timestamp *ts) {
        return timespec_load(&(const struct timespec) { .tv_sec = ts->tv_sec, .tv_nsec = ts->tv_nsec });
}
nsec_t statx_timestamp_load_nsec(const struct statx_timestamp *ts) {
        return timespec_load_nsec(&(const struct timespec) { .tv_sec = ts->tv_sec, .tv_nsec = ts->tv_nsec });
}

void inode_hash_func(const struct stat *q, struct siphash *state) {
        siphash24_compress_typesafe(q->st_dev, state);
        siphash24_compress_typesafe(q->st_ino, state);
}

int inode_compare_func(const struct stat *a, const struct stat *b) {
        int r;

        r = CMP(a->st_dev, b->st_dev);
        if (r != 0)
                return r;

        return CMP(a->st_ino, b->st_ino);
}

DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(inode_hash_ops, struct stat, inode_hash_func, inode_compare_func, free);

const char* inode_type_to_string(mode_t m) {

        /* Returns a short string for the inode type. We use the same name as the underlying macros for each
         * inode type. */

        switch (m & S_IFMT) {
        case S_IFREG:
                return "reg";
        case S_IFDIR:
                return "dir";
        case S_IFLNK:
                return "lnk";
        case S_IFCHR:
                return "chr";
        case S_IFBLK:
                return "blk";
        case S_IFIFO:
                return "fifo";
        case S_IFSOCK:
                return "sock";
        }

        /* Note anonymous inodes in the kernel will have a zero type. Hence fstat() of an eventfd() will
         * return an .st_mode where we'll return NULL here! */
        return NULL;
}

mode_t inode_type_from_string(const char *s) {
        if (!s)
                return MODE_INVALID;

        if (streq(s, "reg"))
                return S_IFREG;
        if (streq(s, "dir"))
                return S_IFDIR;
        if (streq(s, "lnk"))
                return S_IFLNK;
        if (streq(s, "chr"))
                return S_IFCHR;
        if (streq(s, "blk"))
                return S_IFBLK;
        if (streq(s, "fifo"))
                return S_IFIFO;
        if (streq(s, "sock"))
                return S_IFSOCK;

        return MODE_INVALID;
}

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3	#include <fcntl.h>
4	#include <linux/magic.h>
5	#include <sys/statvfs.h>
6	#include <unistd.h>
7
8	#include "alloc-util.h"
9	#include "chase.h"
10	#include "dirent-util.h"
11	#include "errno-util.h"
12	#include "fd-util.h"
13	#include "filesystems.h"
14	#include "fs-util.h"
15	#include "hash-funcs.h"
16	#include "log.h"
17	#include "mountpoint-util.h"
18	#include "path-util.h"
19	#include "siphash24.h"
20	#include "stat-util.h"
21	#include "string-util.h"
22	#include "time-util.h"
23
24	static int verify_stat_at(	2,201,631✔
25	int fd,
26	const char *path,
27	bool follow,
28	int (verify_func)(const struct stat st),
29	bool verify) {
30
31	struct stat st;	2,201,631✔
32	int r;	2,201,631✔
33
34	assert(fd >= 0 \|\| fd == AT_FDCWD);	2,201,631✔
35	assert(!isempty(path) \|\| !follow);	2,201,631✔
36	assert(verify_func);	2,201,631✔
37
38	if (fstatat(fd, strempty(path), &st,	5,231,291✔
39	(isempty(path) ? AT_EMPTY_PATH : 0) \| (follow ? 0 : AT_SYMLINK_NOFOLLOW)) < 0)	2,201,631✔
40	return -errno;	7,635✔
41
42	r = verify_func(&st);	2,193,996✔
43	return verify ? r : r >= 0;	2,193,996✔
44	}
45
46	int stat_verify_regular(const struct stat *st) {	2,656,008✔
47	assert(st);	2,656,008✔
48
49	/* Checks whether the specified stat() structure refers to a regular file. If not returns an
50	* appropriate error code. */
51
52	if (S_ISDIR(st->st_mode))	2,656,008✔
53	return -EISDIR;
54
55	if (S_ISLNK(st->st_mode))	2,653,820✔
56	return -ELOOP;
57
58	if (!S_ISREG(st->st_mode))	2,653,806✔
59	return -EBADFD;	17✔
60
61	return 0;
62	}
63
64	int verify_regular_at(int fd, const char *path, bool follow) {	828,285✔
65	return verify_stat_at(fd, path, follow, stat_verify_regular, true);	828,285✔
66	}
67
68	int fd_verify_regular(int fd) {	828,008✔
69	assert(fd >= 0);	828,008✔
70	return verify_regular_at(fd, NULL, false);	828,008✔
71	}
72
73	int stat_verify_directory(const struct stat *st) {	1,394,838✔
74	assert(st);	1,394,838✔
75
76	if (S_ISLNK(st->st_mode))	1,394,838✔
77	return -ELOOP;
78
79	if (!S_ISDIR(st->st_mode))	1,394,828✔
80	return -ENOTDIR;	8✔
81
82	return 0;
83	}
84
85	int fd_verify_directory(int fd) {	18✔
86	assert(fd >= 0);	18✔
87	return verify_stat_at(fd, NULL, false, stat_verify_directory, true);	18✔
88	}
89
90	int is_dir_at(int fd, const char *path, bool follow) {	1,358,976✔
91	return verify_stat_at(fd, path, follow, stat_verify_directory, false);	1,358,976✔
92	}
93
94	int is_dir(const char *path, bool follow) {	508,056✔
95	assert(!isempty(path));	508,056✔
96	return is_dir_at(AT_FDCWD, path, follow);	508,056✔
97	}
98
99	int stat_verify_symlink(const struct stat *st) {	14,229✔
100	assert(st);	14,229✔
101
102	if (S_ISDIR(st->st_mode))	14,229✔
103	return -EISDIR;
104
105	if (!S_ISLNK(st->st_mode))	14,214✔
106	return -ENOLINK;	266✔
107
108	return 0;
109	}
110
111	int is_symlink(const char *path) {	14,229✔
112	assert(!isempty(path));	14,229✔
113	return verify_stat_at(AT_FDCWD, path, false, stat_verify_symlink, false);	14,229✔
114	}
115
116	int stat_verify_linked(const struct stat *st) {	1,798,897✔
117	assert(st);	1,798,897✔
118
119	if (st->st_nlink <= 0)	1,798,897✔
120	return -EIDRM; /* recognizable error. */	2✔
121
122	return 0;
123	}
124
125	int fd_verify_linked(int fd) {	3✔
126	assert(fd >= 0);	3✔
127	return verify_stat_at(fd, NULL, false, stat_verify_linked, true);	3✔
128	}
129
130	int stat_verify_device_node(const struct stat *st) {	3,191✔
131	assert(st);	3,191✔
132
133	if (S_ISLNK(st->st_mode))	3,191✔
134	return -ELOOP;
135
136	if (S_ISDIR(st->st_mode))	3,191✔
137	return -EISDIR;
138
139	if (!S_ISBLK(st->st_mode) && !S_ISCHR(st->st_mode))	3,080✔
140	return -ENOTTY;	5✔
141
142	return 0;
143	}
144
145	int is_device_node(const char *path) {	120✔
146	assert(!isempty(path));	120✔
147	return verify_stat_at(AT_FDCWD, path, false, stat_verify_device_node, false);	120✔
148	}
149
150	int dir_is_empty_at(int dir_fd, const char *path, bool ignore_hidden_or_backup) {	36,646✔
151	_cleanup_close_ int fd = -EBADF;	36,646✔
152	struct dirent *buf;	36,646✔
153	size_t m;	36,646✔
154
155	fd = xopenat(dir_fd, path, O_DIRECTORY\|O_CLOEXEC);	36,646✔
156	if (fd < 0)	36,646✔
157	return fd;
158
159	/* Allocate space for at least 3 full dirents, since every dir has at least two entries ("." +
160	* ".."), and only once we have seen if there's a third we know whether the dir is empty or not. If
161	* 'ignore_hidden_or_backup' is true we'll allocate a bit more, since we might skip over a bunch of
162	* entries that we end up ignoring. */
163	m = (ignore_hidden_or_backup ? 16 : 3) * DIRENT_SIZE_MAX;	2,140✔
164	buf = alloca(m);	2,140✔
165
166	for (;;) {	3,417✔
167	struct dirent *de;	3,417✔
168	ssize_t n;	3,417✔
169
170	n = getdents64(fd, buf, m);	3,417✔
171	if (n < 0)	3,417✔
172	return -errno;	×
173	if (n == 0)	3,417✔
174	break;
175
176	assert((size_t) n <= m);	2,140✔
177	msan_unpoison(buf, n);	2,140✔
178
179	FOREACH_DIRENT_IN_BUFFER(de, buf, n)	5,584✔
180	if (!(ignore_hidden_or_backup ? hidden_or_backup_file(de->d_name) : dot_or_dot_dot(de->d_name)))	4,307✔
181	return 0;
182	}
183
184	return 1;
185	}
186
187	bool stat_may_be_dev_null(struct stat *st) {	402,821✔
188	assert(st);	402,821✔
189
190	/* We don't want to hardcode the major/minor of /dev/null, hence we do a simpler "is this a character
191	* device node?" check. */
192
193	return S_ISCHR(st->st_mode);	402,821✔
194	}
195
196	bool stat_is_empty(struct stat *st) {	386,739✔
197	assert(st);	386,739✔
198
199	return S_ISREG(st->st_mode) && st->st_size <= 0;	386,739✔
200	}
201
202	int null_or_empty_path_with_root(const char fn, const char root) {	294,334✔
203	struct stat st;	294,334✔
204	int r;	294,334✔
205
206	assert(fn);	294,334✔
207
208	/* A symlink to /dev/null or an empty file?
209	* When looking under root_dir, we can't expect /dev/ to be mounted,
210	* so let's see if the path is a (possibly dangling) symlink to /dev/null. */
211
212	if (path_equal(path_startswith(fn, root ?: "/"), "dev/null"))	588,668✔
213	return true;	294,334✔
214
215	r = chase_and_stat(fn, root, CHASE_PREFIX_ROOT, NULL, &st);	294,172✔
216	if (r < 0)	294,172✔
217	return r;
218
219	return null_or_empty(&st);	294,059✔
220	}
221
222	int fd_is_read_only_fs(int fd) {	1,811✔
223	struct statfs st;	1,811✔
224
225	assert(fd >= 0);	1,811✔
226
227	if (fstatfs(fd, &st) < 0)	1,811✔
228	return -errno;	×
229
230	if (st.f_flags & ST_RDONLY)	1,811✔
231	return true;
232
233	if (is_network_fs(&st)) {	1,445✔
234	/* On NFS, fstatfs() might not reflect whether we can actually write to the remote share.
235	* Let's try again with access(W_OK) which is more reliable, at least sometimes. */
236	if (access_fd(fd, W_OK) == -EROFS)	×
237	return true;	×
238	}
239
240	return false;
241	}
242
243	int path_is_read_only_fs(const char *path) {	1,518✔
244	_cleanup_close_ int fd = -EBADF;	1,518✔
245
246	assert(path);	1,518✔
247
248	fd = open(path, O_CLOEXEC \| O_PATH);	1,518✔
249	if (fd < 0)	1,518✔
250	return -errno;	146✔
251
252	return fd_is_read_only_fs(fd);	1,372✔
253	}
254
255	int inode_same_at(int fda, const char filea, int fdb, const char fileb, int flags) {	15,947✔
256	struct stat sta, stb;	15,947✔
257	int r;	15,947✔
258
259	assert(fda >= 0 \|\| fda == AT_FDCWD);	15,947✔
260	assert(fdb >= 0 \|\| fdb == AT_FDCWD);	15,947✔
261	assert((flags & ~(AT_EMPTY_PATH\|AT_SYMLINK_NOFOLLOW\|AT_NO_AUTOMOUNT)) == 0);	15,947✔
262
263	/* Refuse an unset filea or fileb early unless AT_EMPTY_PATH is set */
264	if ((isempty(filea) \|\| isempty(fileb)) && !FLAGS_SET(flags, AT_EMPTY_PATH))	31,644✔
265	return -EINVAL;	15,947✔
266
267	/* Shortcut: comparing the same fd with itself means we can return true */
268	if (fda >= 0 && fda == fdb && isempty(filea) && isempty(fileb) && FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW))	15,949✔
269	return true;
270
271	_cleanup_close_ int pin_a = -EBADF, pin_b = -EBADF;	31,893✔
272	if (!FLAGS_SET(flags, AT_NO_AUTOMOUNT)) {	15,946✔
273	/* Let's try to use the name_to_handle_at() AT_HANDLE_FID API to identify identical
274	* inodes. We have to issue multiple calls on the same file for that (first, to acquire the
275	* FID, and then to check if .st_dev is actually the same). Hence let's pin the inode in
276	* between via O_PATH, unless we already have an fd for it. */
277
278	if (!isempty(filea)) {	15,946✔
279	pin_a = openat(fda, filea, O_PATH\|O_CLOEXEC\|(FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW) ? O_NOFOLLOW : 0));	15,697✔
280	if (pin_a < 0)	15,697✔
281	return -errno;	15,643✔
282
283	fda = pin_a;	15,375✔
284	filea = NULL;	15,375✔
285	flags \|= AT_EMPTY_PATH;	15,375✔
286	}
287
288	if (!isempty(fileb)) {	15,624✔
289	pin_b = openat(fdb, fileb, O_PATH\|O_CLOEXEC\|(FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW) ? O_NOFOLLOW : 0));	15,373✔
290	if (pin_b < 0)	15,373✔
291	return -errno;	4✔
292
293	fdb = pin_b;	15,369✔
294	fileb = NULL;	15,369✔
295	flags \|= AT_EMPTY_PATH;	15,369✔
296	}
297
298	int ntha_flags = at_flags_normalize_follow(flags) & (AT_EMPTY_PATH\|AT_SYMLINK_FOLLOW);	15,620✔
299	_cleanup_free_ struct file_handle ha = NULL, hb = NULL;	15,620✔
300	int mntida = -1, mntidb = -1;	15,620✔
301
302	r = name_to_handle_at_try_fid(	15,620✔
303	fda,
304	filea,
305	&ha,
306	&mntida,
307	ntha_flags);
308	if (r < 0) {	15,620✔
309	if (is_name_to_handle_at_fatal_error(r))	201✔
310	return r;
311
312	goto fallback;	201✔
313	}
314
315	r = name_to_handle_at_try_fid(	15,419✔
316	fdb,
317	fileb,
318	&hb,
319	&mntidb,
320	ntha_flags);
321	if (r < 0) {	15,419✔
322	if (is_name_to_handle_at_fatal_error(r))	5✔
323	return r;
324
325	goto fallback;	5✔
326	}
327
328	/* Now compare the two file handles */
329	if (!file_handle_equal(ha, hb))	15,414✔
330	return false;
331
332	/* If the file handles are the same and they come from the same mount ID? Great, then we are
333	* good, they are definitely the same */
334	if (mntida == mntidb)	15,292✔
335	return true;
336
337	/* File handles are the same, they are not on the same mount id. This might either be because
338	* they are on two entirely different file systems, that just happen to have the same FIDs
339	* (because they originally where created off the same disk images), or it could be because
340	* they are located on two distinct bind mounts of the same fs. To check that, let's look at
341	* .st_rdev of the inode. We simply reuse the fallback codepath for that, since it checks
342	* exactly that (it checks slightly more, but we don't care.) */
343	}
344
345	fallback:	×
346	if (fstatat(fda, strempty(filea), &sta, flags) < 0)	606✔
347	return log_debug_errno(errno, "Cannot stat %s: %m", strna(filea));	×
348
349	if (fstatat(fdb, strempty(fileb), &stb, flags) < 0)	606✔
350	return log_debug_errno(errno, "Cannot stat %s: %m", strna(fileb));	×
351
352	return stat_inode_same(&sta, &stb);	303✔
353	}
354
355	bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) {	8,279,048✔
356	assert(s);	8,279,048✔
357	assert_cc(sizeof(statfs_f_type_t) >= sizeof(s->f_type));	8,279,048✔
358
359	return F_TYPE_EQUAL(s->f_type, magic_value);	8,279,048✔
360	}
361
362	int is_fs_type_at(int dir_fd, const char *path, statfs_f_type_t magic_value) {	8,274,211✔
363	struct statfs s;	8,274,211✔
364	int r;	8,274,211✔
365
366	r = xstatfsat(dir_fd, path, &s);	8,274,211✔
367	if (r < 0)	8,274,211✔
368	return r;	8,274,211✔
369
370	return is_fs_type(&s, magic_value);	8,274,210✔
371	}
372
373	bool is_temporary_fs(const struct statfs *s) {	8,354✔
374	return fs_in_group(s, FILESYSTEM_SET_TEMPORARY);	8,354✔
375	}
376
377	bool is_network_fs(const struct statfs *s) {	18,020✔
378	return fs_in_group(s, FILESYSTEM_SET_NETWORK);	18,020✔
379	}
380
381	int fd_is_temporary_fs(int fd) {	151✔
382	struct statfs s;	151✔
383
384	if (fstatfs(fd, &s) < 0)	151✔
385	return -errno;	×
386
387	return is_temporary_fs(&s);	151✔
388	}
389
390	int fd_is_network_fs(int fd) {	16,468✔
391	struct statfs s;	16,468✔
392
393	if (fstatfs(fd, &s) < 0)	16,468✔
394	return -errno;	×
395
396	return is_network_fs(&s);	16,468✔
397	}
398
399	int path_is_temporary_fs(const char *path) {	11✔
400	struct statfs s;	11✔
401
402	if (statfs(path, &s) < 0)	11✔
403	return -errno;	2✔
404
405	return is_temporary_fs(&s);	9✔
406	}
407
408	int path_is_network_fs(const char *path) {	×
409	struct statfs s;	×
410
411	if (statfs(path, &s) < 0)	×
412	return -errno;	×
413
414	return is_network_fs(&s);	×
415	}
416
417	int proc_mounted(void) {	30,471✔
418	int r;	30,471✔
419
420	/* A quick check of procfs is properly mounted */
421
422	r = path_is_fs_type("/proc/", PROC_SUPER_MAGIC);	30,471✔
423	if (r == -ENOENT) /* not mounted at all */	30,471✔
424	return false;	×
425
426	return r;
427	}
428
429	bool stat_inode_same(const struct stat a, const struct stat b) {	1,385,723✔
430
431	/* Returns if the specified stat structure references the same (though possibly modified) inode. Does
432	* a thorough check, comparing inode nr, backing device and if the inode is still of the same type. */
433
434	return stat_is_set(a) && stat_is_set(b) &&	2,769,369✔
435	((a->st_mode ^ b->st_mode) & S_IFMT) == 0 && /* same inode type */	1,347,563✔
436	a->st_dev == b->st_dev &&	2,674,271✔
437	a->st_ino == b->st_ino;	1,288,548✔
438	}
439
440	bool stat_inode_unmodified(const struct stat a, const struct stat b) {	120,791✔
441
442	/* Returns if the specified stat structures reference the same, unmodified inode. This check tries to
443	* be reasonably careful when detecting changes: we check both inode and mtime, to cater for file
444	* systems where mtimes are fixed to 0 (think: ostree/nixos type installations). We also check file
445	* size, backing device, inode type and if this refers to a device not the major/minor.
446	*
447	* Note that we don't care if file attributes such as ownership or access mode change, this here is
448	* about contents of the file. The purpose here is to detect file contents changes, and nothing
449	* else. */
450
451	return stat_inode_same(a, b) &&	120,791✔
452	a->st_mtim.tv_sec == b->st_mtim.tv_sec &&	75,530✔
453	a->st_mtim.tv_nsec == b->st_mtim.tv_nsec &&	75,368✔
454	(!S_ISREG(a->st_mode) \|\| a->st_size == b->st_size) && /* if regular file, compare file size */	196,123✔
455	(!(S_ISCHR(a->st_mode) \|\| S_ISBLK(a->st_mode)) \|\| a->st_rdev == b->st_rdev); /* if device node, also compare major/minor, because we can */	75,332✔
456	}
457
458	bool statx_inode_same(const struct statx a, const struct statx b) {	4,162,011✔
459
460	/* Same as stat_inode_same() but for struct statx */
461
462	return statx_is_set(a) && statx_is_set(b) &&	8,324,022✔
463	FLAGS_SET(a->stx_mask, STATX_TYPE\|STATX_INO) && FLAGS_SET(b->stx_mask, STATX_TYPE\|STATX_INO) &&	4,162,011✔
464	((a->stx_mode ^ b->stx_mode) & S_IFMT) == 0 &&	4,162,011✔
465	a->stx_dev_major == b->stx_dev_major &&	4,162,011✔
466	a->stx_dev_minor == b->stx_dev_minor &&	3,958,083✔
467	a->stx_ino == b->stx_ino;	3,944,817✔
468	}
469
470	bool statx_mount_same(const struct statx a, const struct statx b) {	3,914,911✔
471	if (!statx_is_set(a) \|\| !statx_is_set(b))	7,829,822✔
472	return false;
473
474	/* if we have the mount ID, that's all we need */
475	if (FLAGS_SET(a->stx_mask, STATX_MNT_ID) && FLAGS_SET(b->stx_mask, STATX_MNT_ID))	3,914,911✔
476	return a->stx_mnt_id == b->stx_mnt_id;	3,914,911✔
477
478	/* Otherwise, major/minor of backing device must match */
479	return a->stx_dev_major == b->stx_dev_major &&	×
480	a->stx_dev_minor == b->stx_dev_minor;	×
481	}
482
483	int xstatfsat(int dir_fd, const char path, struct statfs ret) {	8,274,599✔
484	_cleanup_close_ int fd = -EBADF;	8,274,599✔
485
486	assert(dir_fd >= 0 \|\| dir_fd == AT_FDCWD);	8,274,599✔
487	assert(ret);	8,274,599✔
488
489	if (!isempty(path)) {	8,274,599✔
490	fd = xopenat(dir_fd, path, O_PATH\|O_CLOEXEC\|O_NOCTTY);	30,980✔
491	if (fd < 0)	30,980✔
492	return fd;
493	dir_fd = fd;
494	}
495
496	return RET_NERRNO(fstatfs(dir_fd, ret));	8,274,599✔
497	}
498
499	usec_t statx_timestamp_load(const struct statx_timestamp *ts) {	4,988✔
500	return timespec_load(&(const struct timespec) { .tv_sec = ts->tv_sec, .tv_nsec = ts->tv_nsec });	4,988✔
501	}
502	nsec_t statx_timestamp_load_nsec(const struct statx_timestamp *ts) {	820✔
503	return timespec_load_nsec(&(const struct timespec) { .tv_sec = ts->tv_sec, .tv_nsec = ts->tv_nsec });	820✔
504	}
505
506	void inode_hash_func(const struct stat q, struct siphash state) {	37,387✔
507	siphash24_compress_typesafe(q->st_dev, state);	37,387✔
508	siphash24_compress_typesafe(q->st_ino, state);	37,387✔
509	}	37,387✔
510
511	int inode_compare_func(const struct stat a, const struct stat b) {	31,537✔
512	int r;	31,537✔
513
514	r = CMP(a->st_dev, b->st_dev);	31,537✔
515	if (r != 0)	26,760✔
516	return r;	4,879✔
517
518	return CMP(a->st_ino, b->st_ino);	26,658✔
519	}
520
521	DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(inode_hash_ops, struct stat, inode_hash_func, inode_compare_func, free);	816✔
522
523	const char* inode_type_to_string(mode_t m) {	7,367✔
524
525	/* Returns a short string for the inode type. We use the same name as the underlying macros for each
526	* inode type. */
527
528	switch (m & S_IFMT) {	7,367✔
529	case S_IFREG:
530	return "reg";
531	case S_IFDIR:	2,826✔
532	return "dir";	2,826✔
533	case S_IFLNK:	1✔
534	return "lnk";	1✔
535	case S_IFCHR:	970✔
536	return "chr";	970✔
537	case S_IFBLK:	441✔
538	return "blk";	441✔
539	case S_IFIFO:	441✔
540	return "fifo";	441✔
541	case S_IFSOCK:	593✔
542	return "sock";	593✔
543	}
544
545	/* Note anonymous inodes in the kernel will have a zero type. Hence fstat() of an eventfd() will
546	* return an .st_mode where we'll return NULL here! */
547	return NULL;	3✔
548	}
549
550	mode_t inode_type_from_string(const char *s) {	13✔
551	if (!s)	13✔
552	return MODE_INVALID;
553
554	if (streq(s, "reg"))	13✔
555	return S_IFREG;
556	if (streq(s, "dir"))	10✔
557	return S_IFDIR;
558	if (streq(s, "lnk"))	7✔
559	return S_IFLNK;
560	if (streq(s, "chr"))	6✔
561	return S_IFCHR;
562	if (streq(s, "blk"))	5✔
563	return S_IFBLK;
564	if (streq(s, "fifo"))	4✔
565	return S_IFIFO;
566	if (streq(s, "sock"))	2✔
567	return S_IFSOCK;	2✔
568
569	return MODE_INVALID;
570	}

systemd / systemd / 16556981419

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