File: | build-scan/../src/shared/machine-pool.c |
Warning: | line 113, column 17 Value stored to 'fd' is never read |
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1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2 | |
3 | #include <errno(*__errno_location ()).h> |
4 | #include <fcntl.h> |
5 | #include <linux1/loop.h> |
6 | #include <signal.h> |
7 | #include <stdbool.h> |
8 | #include <stdio.h> |
9 | #include <stdlib.h> |
10 | #include <sys/file.h> |
11 | #include <sys/ioctl.h> |
12 | #include <sys/mount.h> |
13 | #include <sys/prctl.h> |
14 | #include <sys/stat.h> |
15 | #include <sys/statfs.h> |
16 | #include <sys/statvfs.h> |
17 | #include <unistd.h> |
18 | |
19 | #include "sd-bus-protocol.h" |
20 | #include "sd-bus.h" |
21 | |
22 | #include "alloc-util.h" |
23 | #include "btrfs-util.h" |
24 | #include "fd-util.h" |
25 | #include "fileio.h" |
26 | #include "fs-util.h" |
27 | #include "label.h" |
28 | #include "lockfile-util.h" |
29 | #include "log.h" |
30 | #include "machine-pool.h" |
31 | #include "macro.h" |
32 | #include "missing.h" |
33 | #include "mkdir.h" |
34 | #include "mount-util.h" |
35 | #include "parse-util.h" |
36 | #include "path-util.h" |
37 | #include "process-util.h" |
38 | #include "signal-util.h" |
39 | #include "stat-util.h" |
40 | #include "string-util.h" |
41 | |
42 | #define VAR_LIB_MACHINES_SIZE_START(1024UL*1024UL*500UL) (1024UL*1024UL*500UL) |
43 | #define VAR_LIB_MACHINES_FREE_MIN(1024UL*1024UL*750UL) (1024UL*1024UL*750UL) |
44 | |
45 | static int check_btrfs(void) { |
46 | struct statfs sfs; |
47 | |
48 | if (statfs("/var/lib/machines", &sfs) < 0) { |
49 | if (errno(*__errno_location ()) != ENOENT2) |
50 | return -errno(*__errno_location ()); |
51 | |
52 | if (statfs("/var/lib", &sfs) < 0) |
53 | return -errno(*__errno_location ()); |
54 | } |
55 | |
56 | return F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC)(sfs.f_type == (typeof(sfs.f_type)) 0x9123683E); |
57 | } |
58 | |
59 | static int setup_machine_raw(uint64_t size, sd_bus_error *error) { |
60 | _cleanup_free___attribute__((cleanup(freep))) char *tmp = NULL((void*)0); |
61 | _cleanup_close___attribute__((cleanup(closep))) int fd = -1; |
62 | struct statvfs ss; |
63 | pid_t pid = 0; |
64 | int r; |
65 | |
66 | /* We want to be able to make use of btrfs-specific file |
67 | * system features, in particular subvolumes, reflinks and |
68 | * quota. Hence, if we detect that /var/lib/machines.raw is |
69 | * not located on btrfs, let's create a loopback file, place a |
70 | * btrfs file system into it, and mount it to |
71 | * /var/lib/machines. */ |
72 | |
73 | fd = open("/var/lib/machines.raw", O_RDWR02|O_CLOEXEC02000000|O_NONBLOCK04000|O_NOCTTY0400); |
74 | if (fd >= 0) |
75 | return TAKE_FD(fd)({ int _fd_ = (fd); (fd) = -1; _fd_; }); |
76 | |
77 | if (errno(*__errno_location ()) != ENOENT2) |
78 | return sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to open /var/lib/machines.raw: %m"); |
79 | |
80 | r = tempfn_xxxxxx("/var/lib/machines.raw", NULL((void*)0), &tmp); |
81 | if (r < 0) |
82 | return r; |
83 | |
84 | (void) mkdir_p_label("/var/lib", 0755); |
85 | fd = open(tmp, O_RDWR02|O_CREAT0100|O_EXCL0200|O_NOCTTY0400|O_CLOEXEC02000000, 0600); |
86 | if (fd < 0) |
87 | return sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to create /var/lib/machines.raw: %m"); |
88 | |
89 | if (fstatvfs(fd, &ss) < 0) { |
90 | r = sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to determine free space on /var/lib/machines.raw: %m"); |
91 | goto fail; |
92 | } |
93 | |
94 | if (ss.f_bsize * ss.f_bavail < VAR_LIB_MACHINES_FREE_MIN(1024UL*1024UL*750UL)) { |
95 | r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED"org.freedesktop.DBus.Error.Failed", "Not enough free disk space to set up /var/lib/machines."); |
96 | goto fail; |
97 | } |
98 | |
99 | if (ftruncate(fd, size) < 0) { |
100 | r = sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to enlarge /var/lib/machines.raw: %m"); |
101 | goto fail; |
102 | } |
103 | |
104 | r = safe_fork("(mkfs)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &pid); |
105 | if (r < 0) { |
106 | sd_bus_error_set_errnof(error, r, "Failed to fork mkfs.btrfs: %m"); |
107 | goto fail; |
108 | } |
109 | if (r == 0) { |
110 | |
111 | /* Child */ |
112 | |
113 | fd = safe_close(fd); |
Value stored to 'fd' is never read | |
114 | |
115 | execlp("mkfs.btrfs", "-Lvar-lib-machines", tmp, NULL((void*)0)); |
116 | if (errno(*__errno_location ()) == ENOENT2) |
117 | _exit(99); |
118 | |
119 | _exit(EXIT_FAILURE1); |
120 | } |
121 | |
122 | r = wait_for_terminate_and_check("mkfs", pid, 0); |
123 | pid = 0; |
124 | |
125 | if (r < 0) { |
126 | sd_bus_error_set_errnof(error, r, "Failed to wait for mkfs.btrfs: %m"); |
127 | goto fail; |
128 | } |
129 | if (r == 99) { |
130 | r = sd_bus_error_set_errnof(error, ENOENT2, "Cannot set up /var/lib/machines, mkfs.btrfs is missing"); |
131 | goto fail; |
132 | } |
133 | if (r != EXIT_SUCCESS0) { |
134 | r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED"org.freedesktop.DBus.Error.Failed", "mkfs.btrfs failed with error code %i", r); |
135 | goto fail; |
136 | } |
137 | |
138 | r = rename_noreplace(AT_FDCWD-100, tmp, AT_FDCWD-100, "/var/lib/machines.raw"); |
139 | if (r < 0) { |
140 | sd_bus_error_set_errnof(error, r, "Failed to move /var/lib/machines.raw into place: %m"); |
141 | goto fail; |
142 | } |
143 | |
144 | return TAKE_FD(fd)({ int _fd_ = (fd); (fd) = -1; _fd_; }); |
145 | |
146 | fail: |
147 | unlink_noerrno(tmp); |
148 | |
149 | if (pid > 1) |
150 | kill_and_sigcont(pid, SIGKILL9); |
151 | |
152 | return r; |
153 | } |
154 | |
155 | int setup_machine_directory(uint64_t size, sd_bus_error *error) { |
156 | _cleanup_(release_lock_file)__attribute__((cleanup(release_lock_file))) LockFile lock_file = LOCK_FILE_INIT{ .fd = -1, .path = ((void*)0) }; |
157 | struct loop_info64 info = { |
158 | .lo_flags = LO_FLAGS_AUTOCLEAR, |
159 | }; |
160 | _cleanup_close___attribute__((cleanup(closep))) int fd = -1, control = -1, loop = -1; |
161 | _cleanup_free___attribute__((cleanup(freep))) char* loopdev = NULL((void*)0); |
162 | char tmpdir[] = "/tmp/machine-pool.XXXXXX", *mntdir = NULL((void*)0); |
163 | bool_Bool tmpdir_made = false0, mntdir_made = false0, mntdir_mounted = false0; |
164 | char buf[FORMAT_BYTES_MAX8]; |
165 | int r, nr = -1; |
166 | |
167 | /* btrfs cannot handle file systems < 16M, hence use this as minimum */ |
168 | if (size == (uint64_t) -1) |
169 | size = VAR_LIB_MACHINES_SIZE_START(1024UL*1024UL*500UL); |
170 | else if (size < 16*1024*1024) |
171 | size = 16*1024*1024; |
172 | |
173 | /* Make sure we only set the directory up once at a time */ |
174 | r = make_lock_file("/run/systemd/machines.lock", LOCK_EX2, &lock_file); |
175 | if (r < 0) |
176 | return r; |
177 | |
178 | r = check_btrfs(); |
179 | if (r < 0) |
180 | return sd_bus_error_set_errnof(error, r, "Failed to determine whether /var/lib/machines is located on btrfs: %m"); |
181 | if (r > 0) { |
182 | (void) btrfs_subvol_make_label("/var/lib/machines"); |
183 | |
184 | r = btrfs_quota_enable("/var/lib/machines", true1); |
185 | if (r < 0) |
186 | log_warning_errno(r, "Failed to enable quota for /var/lib/machines, ignoring: %m")({ int _level = ((4)), _e = ((r)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/shared/machine-pool.c", 186, __func__, "Failed to enable quota for /var/lib/machines, ignoring: %m" ) : -abs(_e); }); |
187 | |
188 | r = btrfs_subvol_auto_qgroup("/var/lib/machines", 0, true1); |
189 | if (r < 0) |
190 | log_warning_errno(r, "Failed to set up default quota hierarchy for /var/lib/machines, ignoring: %m")({ int _level = ((4)), _e = ((r)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/shared/machine-pool.c", 190, __func__, "Failed to set up default quota hierarchy for /var/lib/machines, ignoring: %m" ) : -abs(_e); }); |
191 | |
192 | return 1; |
193 | } |
194 | |
195 | if (path_is_mount_point("/var/lib/machines", NULL((void*)0), AT_SYMLINK_FOLLOW0x400) > 0) { |
196 | log_debug("/var/lib/machines is already a mount point, not creating loopback file for it.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/shared/machine-pool.c", 196, __func__, "/var/lib/machines is already a mount point, not creating loopback file for it." ) : -abs(_e); }); |
197 | return 0; |
198 | } |
199 | |
200 | r = dir_is_populated("/var/lib/machines"); |
201 | if (r < 0 && r != -ENOENT2) |
202 | return r; |
203 | if (r > 0) { |
204 | log_debug("/var/log/machines is already populated, not creating loopback file for it.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/shared/machine-pool.c", 204, __func__, "/var/log/machines is already populated, not creating loopback file for it." ) : -abs(_e); }); |
205 | return 0; |
206 | } |
207 | |
208 | r = mkfs_exists("btrfs"); |
209 | if (r == 0) |
210 | return sd_bus_error_set_errnof(error, ENOENT2, "Cannot set up /var/lib/machines, mkfs.btrfs is missing"); |
211 | if (r < 0) |
212 | return r; |
213 | |
214 | fd = setup_machine_raw(size, error); |
215 | if (fd < 0) |
216 | return fd; |
217 | |
218 | control = open("/dev/loop-control", O_RDWR02|O_CLOEXEC02000000|O_NOCTTY0400|O_NONBLOCK04000); |
219 | if (control < 0) |
220 | return sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to open /dev/loop-control: %m"); |
221 | |
222 | nr = ioctl(control, LOOP_CTL_GET_FREE0x4C82); |
223 | if (nr < 0) |
224 | return sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to allocate loop device: %m"); |
225 | |
226 | if (asprintf(&loopdev, "/dev/loop%i", nr) < 0) { |
227 | r = -ENOMEM12; |
228 | goto fail; |
229 | } |
230 | |
231 | loop = open(loopdev, O_CLOEXEC02000000|O_RDWR02|O_NOCTTY0400|O_NONBLOCK04000); |
232 | if (loop < 0) { |
233 | r = sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to open loopback device: %m"); |
234 | goto fail; |
235 | } |
236 | |
237 | if (ioctl(loop, LOOP_SET_FD0x4C00, fd) < 0) { |
238 | r = sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to bind loopback device: %m"); |
239 | goto fail; |
240 | } |
241 | |
242 | if (ioctl(loop, LOOP_SET_STATUS640x4C04, &info) < 0) { |
243 | r = sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to enable auto-clear for loopback device: %m"); |
244 | goto fail; |
245 | } |
246 | |
247 | /* We need to make sure the new /var/lib/machines directory |
248 | * has an access mode of 0700 at the time it is first made |
249 | * available. mkfs will create it with 0755 however. Hence, |
250 | * let's mount the directory into an inaccessible directory |
251 | * below /tmp first, fix the access mode, and move it to the |
252 | * public place then. */ |
253 | |
254 | if (!mkdtemp(tmpdir)) { |
255 | r = sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to create temporary mount parent directory: %m"); |
256 | goto fail; |
257 | } |
258 | tmpdir_made = true1; |
259 | |
260 | mntdir = strjoina(tmpdir, "/mnt")({ const char *_appendees_[] = { tmpdir, "/mnt" }; char *_d_, *_p_; size_t _len_ = 0; size_t _i_; for (_i_ = 0; _i_ < __extension__ (__builtin_choose_expr( !__builtin_types_compatible_p(typeof (_appendees_), typeof(&*(_appendees_))), sizeof(_appendees_ )/sizeof((_appendees_)[0]), ((void)0))) && _appendees_ [_i_]; _i_++) _len_ += strlen(_appendees_[_i_]); _p_ = _d_ = __builtin_alloca (_len_ + 1); for (_i_ = 0; _i_ < __extension__ (__builtin_choose_expr ( !__builtin_types_compatible_p(typeof(_appendees_), typeof(& *(_appendees_))), sizeof(_appendees_)/sizeof((_appendees_)[0] ), ((void)0))) && _appendees_[_i_]; _i_++) _p_ = stpcpy (_p_, _appendees_[_i_]); *_p_ = 0; _d_; }); |
261 | if (mkdir(mntdir, 0700) < 0) { |
262 | r = sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to create temporary mount directory: %m"); |
263 | goto fail; |
264 | } |
265 | mntdir_made = true1; |
266 | |
267 | if (mount(loopdev, mntdir, "btrfs", 0, NULL((void*)0)) < 0) { |
268 | r = sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to mount loopback device: %m"); |
269 | goto fail; |
270 | } |
271 | mntdir_mounted = true1; |
272 | |
273 | r = btrfs_quota_enable(mntdir, true1); |
274 | if (r < 0) |
275 | log_warning_errno(r, "Failed to enable quota, ignoring: %m")({ int _level = ((4)), _e = ((r)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/shared/machine-pool.c", 275, __func__, "Failed to enable quota, ignoring: %m" ) : -abs(_e); }); |
276 | |
277 | r = btrfs_subvol_auto_qgroup(mntdir, 0, true1); |
278 | if (r < 0) |
279 | log_warning_errno(r, "Failed to set up default quota hierarchy, ignoring: %m")({ int _level = ((4)), _e = ((r)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/shared/machine-pool.c", 279, __func__, "Failed to set up default quota hierarchy, ignoring: %m" ) : -abs(_e); }); |
280 | |
281 | if (chmod(mntdir, 0700) < 0) { |
282 | r = sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to fix owner: %m"); |
283 | goto fail; |
284 | } |
285 | |
286 | (void) mkdir_p_label("/var/lib/machines", 0700); |
287 | |
288 | if (mount(mntdir, "/var/lib/machines", NULL((void*)0), MS_BINDMS_BIND, NULL((void*)0)) < 0) { |
289 | r = sd_bus_error_set_errnof(error, errno(*__errno_location ()), "Failed to mount directory into right place: %m"); |
290 | goto fail; |
291 | } |
292 | |
293 | (void) syncfs(fd); |
294 | |
295 | log_info("Set up /var/lib/machines as btrfs loopback file system of size %s mounted on /var/lib/machines.raw.", format_bytes(buf, sizeof(buf), size))({ int _level = (((6))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/shared/machine-pool.c", 295, __func__, "Set up /var/lib/machines as btrfs loopback file system of size %s mounted on /var/lib/machines.raw." , format_bytes(buf, sizeof(buf), size)) : -abs(_e); }); |
296 | |
297 | (void) umount2(mntdir, MNT_DETACHMNT_DETACH); |
298 | (void) rmdir(mntdir); |
299 | (void) rmdir(tmpdir); |
300 | |
301 | return 1; |
302 | |
303 | fail: |
304 | if (mntdir_mounted) |
305 | (void) umount2(mntdir, MNT_DETACHMNT_DETACH); |
306 | |
307 | if (mntdir_made) |
308 | (void) rmdir(mntdir); |
309 | if (tmpdir_made) |
310 | (void) rmdir(tmpdir); |
311 | |
312 | if (loop >= 0) { |
313 | (void) ioctl(loop, LOOP_CLR_FD0x4C01); |
314 | loop = safe_close(loop); |
315 | } |
316 | |
317 | if (control >= 0 && nr >= 0) |
318 | (void) ioctl(control, LOOP_CTL_REMOVE0x4C81, nr); |
319 | |
320 | return r; |
321 | } |
322 | |
323 | static int sync_path(const char *p) { |
324 | _cleanup_close___attribute__((cleanup(closep))) int fd = -1; |
325 | |
326 | fd = open(p, O_RDONLY00|O_CLOEXEC02000000|O_NOCTTY0400); |
327 | if (fd < 0) |
328 | return -errno(*__errno_location ()); |
329 | |
330 | if (syncfs(fd) < 0) |
331 | return -errno(*__errno_location ()); |
332 | |
333 | return 0; |
334 | } |
335 | |
336 | int grow_machine_directory(void) { |
337 | char buf[FORMAT_BYTES_MAX8]; |
338 | struct statvfs a, b; |
339 | uint64_t old_size, new_size, max_add; |
340 | int r; |
341 | |
342 | /* Ensure the disk space data is accurate */ |
343 | sync_path("/var/lib/machines"); |
344 | sync_path("/var/lib/machines.raw"); |
345 | |
346 | if (statvfs("/var/lib/machines.raw", &a) < 0) |
347 | return -errno(*__errno_location ()); |
348 | |
349 | if (statvfs("/var/lib/machines", &b) < 0) |
350 | return -errno(*__errno_location ()); |
351 | |
352 | /* Don't grow if not enough disk space is available on the host */ |
353 | if (((uint64_t) a.f_bavail * (uint64_t) a.f_bsize) <= VAR_LIB_MACHINES_FREE_MIN(1024UL*1024UL*750UL)) |
354 | return 0; |
355 | |
356 | /* Don't grow if at least 1/3th of the fs is still free */ |
357 | if (b.f_bavail > b.f_blocks / 3) |
358 | return 0; |
359 | |
360 | /* Calculate how much we are willing to add at most */ |
361 | max_add = ((uint64_t) a.f_bavail * (uint64_t) a.f_bsize) - VAR_LIB_MACHINES_FREE_MIN(1024UL*1024UL*750UL); |
362 | |
363 | /* Calculate the old size */ |
364 | old_size = (uint64_t) b.f_blocks * (uint64_t) b.f_bsize; |
365 | |
366 | /* Calculate the new size as three times the size of what is used right now */ |
367 | new_size = ((uint64_t) b.f_blocks - (uint64_t) b.f_bavail) * (uint64_t) b.f_bsize * 3; |
368 | |
369 | /* Always, grow at least to the start size */ |
370 | if (new_size < VAR_LIB_MACHINES_SIZE_START(1024UL*1024UL*500UL)) |
371 | new_size = VAR_LIB_MACHINES_SIZE_START(1024UL*1024UL*500UL); |
372 | |
373 | /* If the new size is smaller than the old size, don't grow */ |
374 | if (new_size < old_size) |
375 | return 0; |
376 | |
377 | /* Ensure we never add more than the maximum */ |
378 | if (new_size > old_size + max_add) |
379 | new_size = old_size + max_add; |
380 | |
381 | r = btrfs_resize_loopback("/var/lib/machines", new_size, true1); |
382 | if (r <= 0) |
383 | return r; |
384 | |
385 | /* Also bump the quota, of both the subvolume leaf qgroup, as |
386 | * well as of any subtree quota group by the same id but a |
387 | * higher level, if it exists. */ |
388 | (void) btrfs_qgroup_set_limit("/var/lib/machines", 0, new_size); |
389 | (void) btrfs_subvol_set_subtree_quota_limit("/var/lib/machines", 0, new_size); |
390 | |
391 | log_info("Grew /var/lib/machines btrfs loopback file system to %s.", format_bytes(buf, sizeof(buf), new_size))({ int _level = (((6))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/shared/machine-pool.c", 391, __func__, "Grew /var/lib/machines btrfs loopback file system to %s." , format_bytes(buf, sizeof(buf), new_size)) : -abs(_e); }); |
392 | return 1; |
393 | } |