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-rw-r--r--src/shared/btrfs-util.c17
-rw-r--r--src/shared/btrfs-util.h4
-rw-r--r--src/shared/machine-pool.c75
-rw-r--r--src/shared/machine-pool.h1
4 files changed, 91 insertions, 6 deletions
diff --git a/src/shared/btrfs-util.c b/src/shared/btrfs-util.c
index 52fc5f4a17..256c5a6995 100644
--- a/src/shared/btrfs-util.c
+++ b/src/shared/btrfs-util.c
@@ -705,7 +705,7 @@ int btrfs_quota_limit(const char *path, uint64_t referred_max) {
return btrfs_quota_limit_fd(fd, referred_max);
}
-int btrfs_resize_loopback_fd(int fd, uint64_t new_size) {
+int btrfs_resize_loopback_fd(int fd, uint64_t new_size, bool grow_only) {
struct btrfs_ioctl_vol_args args = {};
_cleanup_free_ char *p = NULL, *loop = NULL, *backing = NULL;
_cleanup_close_ int loop_fd = -1, backing_fd = -1;
@@ -726,6 +726,8 @@ int btrfs_resize_loopback_fd(int fd, uint64_t new_size) {
if (asprintf(&p, "/sys/dev/block/%u:%u/loop/backing_file", major(dev), minor(dev)) < 0)
return -ENOMEM;
r = read_one_line_file(p, &backing);
+ if (r == -ENOENT)
+ return -ENODEV;
if (r < 0)
return r;
if (isempty(backing) || !path_is_absolute(backing))
@@ -743,6 +745,9 @@ int btrfs_resize_loopback_fd(int fd, uint64_t new_size) {
if (new_size == (uint64_t) st.st_size)
return 0;
+ if (grow_only && new_size < (uint64_t) st.st_size)
+ return -EINVAL;
+
if (asprintf(&loop, "/dev/block/%u:%u", major(dev), minor(dev)) < 0)
return -ENOMEM;
loop_fd = open(loop, O_RDWR|O_CLOEXEC|O_NOCTTY);
@@ -770,15 +775,19 @@ int btrfs_resize_loopback_fd(int fd, uint64_t new_size) {
return -errno;
}
- return 0;
+ /* Make sure the free disk space is correctly updated for both file systems */
+ (void) fsync(fd);
+ (void) fsync(backing_fd);
+
+ return 1;
}
-int btrfs_resize_loopback(const char *p, uint64_t new_size) {
+int btrfs_resize_loopback(const char *p, uint64_t new_size, bool grow_only) {
_cleanup_close_ int fd = -1;
fd = open(p, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (fd < 0)
return -errno;
- return btrfs_resize_loopback_fd(fd, new_size);
+ return btrfs_resize_loopback_fd(fd, new_size, grow_only);
}
diff --git a/src/shared/btrfs-util.h b/src/shared/btrfs-util.h
index e654a3fea1..a2c246b8d6 100644
--- a/src/shared/btrfs-util.h
+++ b/src/shared/btrfs-util.h
@@ -72,5 +72,5 @@ int btrfs_quota_enable(const char *path, bool b);
int btrfs_quota_limit_fd(int fd, uint64_t referred_max);
int btrfs_quota_limit(const char *path, uint64_t referred_max);
-int btrfs_resize_loopback_fd(int fd, uint64_t size);
-int btrfs_resize_loopback(const char *path, uint64_t size);
+int btrfs_resize_loopback_fd(int fd, uint64_t size, bool grow_only);
+int btrfs_resize_loopback(const char *path, uint64_t size, bool grow_only);
diff --git a/src/shared/machine-pool.c b/src/shared/machine-pool.c
index b74252dbc8..3eafb9443a 100644
--- a/src/shared/machine-pool.c
+++ b/src/shared/machine-pool.c
@@ -169,6 +169,7 @@ int setup_machine_directory(uint64_t size, sd_bus_error *error) {
_cleanup_free_ char* loopdev = NULL;
char tmpdir[] = "/tmp/import-mount.XXXXXX", *mntdir = NULL;
bool tmpdir_made = false, mntdir_made = false, mntdir_mounted = false;
+ char buf[FORMAT_BYTES_MAX];
int r, nr = -1;
/* btrfs cannot handle file systems < 16M, hence use this as minimum */
@@ -274,6 +275,10 @@ int setup_machine_directory(uint64_t size, sd_bus_error *error) {
goto fail;
}
+ (void) syncfs(fd);
+
+ 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));
+
(void) umount2(mntdir, MNT_DETACH);
(void) rmdir(mntdir);
(void) rmdir(tmpdir);
@@ -299,3 +304,73 @@ fail:
return r;
}
+
+static int sync_path(const char *p) {
+ _cleanup_close_ int fd = -1;
+
+ fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ if (fd < 0)
+ return -errno;
+
+ if (syncfs(fd) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int grow_machine_directory(void) {
+ char buf[FORMAT_BYTES_MAX];
+ struct statvfs a, b;
+ uint64_t old_size, new_size, max_add;
+ int r;
+
+ /* Ensure the disk space data is accurate */
+ sync_path("/var/lib/machines");
+ sync_path("/var/lib/machines.raw");
+
+ if (statvfs("/var/lib/machines.raw", &a) < 0)
+ return -errno;
+
+ if (statvfs("/var/lib/machines", &b) < 0)
+ return -errno;
+
+ /* Don't grow if not enough disk space is available on the host */
+ if (((uint64_t) a.f_bavail * (uint64_t) a.f_bsize) <= VAR_LIB_MACHINES_FREE_MIN)
+ return 0;
+
+ /* Don't grow if at least 1/3th of the fs is still free */
+ if (b.f_bavail > b.f_blocks / 3)
+ return 0;
+
+ /* Calculate how much we are willing to add at maximum */
+ max_add = ((uint64_t) a.f_bavail * (uint64_t) a.f_bsize) - VAR_LIB_MACHINES_FREE_MIN;
+
+ /* Calculate the old size */
+ old_size = (uint64_t) b.f_blocks * (uint64_t) b.f_bsize;
+
+ /* Calculate the new size as three times the size of what is used right now */
+ new_size = ((uint64_t) b.f_blocks - (uint64_t) b.f_bavail) * (uint64_t) b.f_bsize * 3;
+
+ /* Always, grow at least to the start size */
+ if (new_size < VAR_LIB_MACHINES_SIZE_START)
+ new_size = VAR_LIB_MACHINES_SIZE_START;
+
+ /* If the new size is smaller than the old size, don't grow */
+ if (new_size < old_size)
+ return 0;
+
+ /* Ensure we never add more than the maximum */
+ if (new_size > old_size + max_add)
+ new_size = old_size + max_add;
+
+ r = btrfs_resize_loopback("/var/lib/machines", new_size, true);
+ if (r <= 0)
+ return r;
+
+ r = btrfs_quota_limit("/var/lib/machines", new_size);
+ if (r < 0)
+ return r;
+
+ log_info("Grew /var/lib/machines btrfs loopback file system to %s.", format_bytes(buf, sizeof(buf), new_size));
+ return 1;
+}
diff --git a/src/shared/machine-pool.h b/src/shared/machine-pool.h
index 9c9849f618..06c5d40583 100644
--- a/src/shared/machine-pool.h
+++ b/src/shared/machine-pool.h
@@ -24,3 +24,4 @@
#include "sd-bus.h"
int setup_machine_directory(uint64_t size, sd_bus_error *error);
+int grow_machine_directory(void);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-14 00:59:29 +0000