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ishwarbb 133909c8f6 resolved: add configurable DNS cache size 
Add CacheSize= option to [Resolve] section of resolved.conf to allow
configuring the maximum number of entries in the per-scope DNS cache.
The default remains 4096 entries. Setting this to 0 disables caching
(similar to Cache=no).

CacheSize= is only read when Cache=yes or Cache=no-negative. When
Cache=no, caching is fully disabled regardless of CacheSize=.

Changes:
- Add cache_size field to Manager struct
- Parse CacheSize= from resolved.conf via gperf
- Thread cache_size through dns_cache_put() and helper functions
- Replace hard-coded CACHE_MAX with the configurable cache_size
- When cache_size is 0 or Cache=no, flush cache and skip caching
- Add man page documentation for the new option
- Add unit tests for cache size enforcement

Co-developed-by: Claude <claude@anthropic.com>
2026-05-18 11:45:03 +01:00
..
ac-power
shared/help-util: automatically append ":" in sections
2026-05-05 11:14:33 +02:00
analyze
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
ask-password
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
backlight
tree-wide: use device_get_sysattr_unsigned() and friends
2026-05-18 02:55:56 +09:00
basic
Introduce several more helper functions to read sysfs attributes and use them where applicable (#41065)
2026-05-18 07:26:44 +09:00
battery-check
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
binfmt
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
bless-boot
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
boot
boot: fix off-by-one truncation when reading efivars
2026-05-18 08:26:44 +02:00
bootctl
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
bpf
merge-bpf-compdb: apply "ruff format"
2026-05-18 02:47:09 +09:00
busctl
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
cgls
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
cgtop
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
core
tree-wide: make use of sd_json_parse_fd() where appropriate
2026-05-18 10:39:04 +01:00
coredump
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
coverage
…
creds
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
cryptenroll
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
cryptsetup
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
debug-generator
debug-generator: assert breakpoint type is valid before bit shift
2026-04-12 13:25:28 +01:00
delta
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
detect-virt
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
dissect
dissect: convert the other parser to option macros
2026-05-16 18:36:08 +02:00
environment-d-generator
…
escape
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
factory-reset
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
firstboot
firstboot,sysinstall,hostnamed: always show FANCY_NAME=
2026-05-12 00:07:42 +01:00
fsck
stat-util: also introduce stat_verify_block() and use it everywhere
2026-04-13 13:20:43 +02:00
fstab-generator
fstab-generator: support swap on network block devices
2026-04-08 11:51:09 +01:00
fundamental
Convert systemctl to option and verb macros (#42088)
2026-05-14 11:33:09 +02:00
fuzz
fuzz-bootspec: apply "ruff format"
2026-05-18 02:44:46 +09:00
getty-generator
…
gpt-auto-generator
gpt-auto-generator: do not fail on missing libcryptsetup when verity
2026-04-23 11:45:22 +02:00
growfs
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
hibernate-resume
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
home
tree-wide: make use of sd_json_parse_fd() where appropriate
2026-05-18 10:39:04 +01:00
hostname
tree-wide: use device_get_sysattr_safe_string()
2026-05-18 02:55:56 +09:00
hwdb
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
id128
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
imds
curl-util: bring CurlGlue/CurlSlot in line with sd-bus and qmp-client
2026-05-08 16:52:57 +02:00
import
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
include
generate-syscall: apply "ruff format" and "ruff check --fix"
2026-05-18 02:44:46 +09:00
integritysetup
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
journal
meson: Drop two unnecessary dependencies
2026-05-15 22:05:07 +02:00
journal-remote
log-generator: apply "ruff format" and "ruff check --fix"
2026-05-18 02:44:46 +09:00
kernel-install
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
keyutil
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
libc
treewide: get rid of remaing getopt/getopt_long stuff
2026-05-16 18:37:12 +02:00
libsystemd
test: add unit test for new sd-json functionality
2026-05-18 10:39:04 +01:00
libsystemd-network
dhcp-message: introduce dhcp_message_{payload,packet}_size()
2026-05-18 09:34:32 +09:00
libudev
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
locale
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
login
tree-wide: use device_get_sysattr_unsigned() and friends
2026-05-18 02:55:56 +09:00
machine
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
machine-id-setup
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
measure
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
modules-load
cpu-set-util: introduce cpus_online().
2026-05-14 08:12:28 +02:00
mount
tree-wide: use device_get_sysattr_unsigned() and friends
2026-05-18 02:55:56 +09:00
mountfsd
Improve error logging for fstat failure
2026-04-30 08:05:54 +02:00
mstack
mstack-tool: convert to OPTION macros
2026-05-05 13:49:51 +02:00
mute-console
bootctl,mute-console,pcrextend,pcrlock,repart: allow connections from self
2026-05-05 17:23:16 +02:00
network
tree-wide: make use of sd_json_parse_fd() where appropriate
2026-05-18 10:39:04 +01:00
notify
shared/help-util: automatically append ":" in sections
2026-05-05 11:14:33 +02:00
nspawn
nspawn: support forwarding FDs from payloads to managers
2026-05-15 13:46:08 +01:00
nsresourced
nsresourced: detect and clean up registry entries for dead user namespaces
2026-05-15 18:05:21 +00:00
nss-myhostname
nss-myhostname: fix maybe-uninitialized warning
2026-04-24 16:45:19 +01:00
nss-mymachines
…
nss-resolve
many: fix remaining check-pointer-deref issues
2026-04-12 15:27:15 +02:00
nss-systemd
nss-systemd: fix off-by-one in nss_pack_group_record_shadow()
2026-04-12 21:20:15 +01:00
oom
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
path
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
pcrextend
bootctl,mute-console,pcrextend,pcrlock,repart: allow connections from self
2026-05-05 17:23:16 +02:00
pcrlock
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
portable
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
pstore
…
ptyfwd
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
quotacheck
…
random-seed
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
remount-fs
…
repart
blockdev-util: Drop name argument from BLKPG functions
2026-05-13 23:47:29 +01:00
reply-password
…
report
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
resolve
resolved: add configurable DNS cache size
2026-05-18 11:45:03 +01:00
rfkill
tree-wide: use device_get_sysattr_safe_string()
2026-05-18 02:55:56 +09:00
rpm
…
run
treewide: fix typos in the entire codebase
2026-05-05 17:22:26 +02:00
run-generator
…
sbsign
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
shared
tree-wide: make use of sd_json_parse_fd() where appropriate
2026-05-18 10:39:04 +01:00
shutdown
shutdown: prepare LUO session for FD Stores before kexec
2026-05-15 13:46:08 +01:00
sleep
tree-wide: use device_get_sysattr_unsigned() and friends
2026-05-18 02:55:56 +09:00
socket-activate
socket-activate: fix comment
2026-05-05 13:48:48 +02:00
socket-proxy
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
ssh-generator
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
stdio-bridge
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
storage
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
storagetm
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
sulogin-shell
…
sysctl
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
sysext
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
sysinstall
firstboot,sysinstall,hostnamed: always show FANCY_NAME=
2026-05-12 00:07:42 +01:00
system-update-generator
…
systemctl
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
systemd
sd-json: add sd_json_parse_fd() helper
2026-05-18 08:51:09 +02:00
sysupdate
tree-wide: make use of sd_json_parse_fd() where appropriate
2026-05-18 10:39:04 +01:00
sysusers
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
test
Introduce several more helper functions to read sysfs attributes and use them where applicable (#41065)
2026-05-18 07:26:44 +09:00
timedate
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
timesync
timesync: verify the actual size of the received data
2026-04-16 19:19:02 +01:00
tmpfiles
tmpfiles: Add commands for file capabilites
2026-05-09 11:36:55 +02:00
tpm2-setup
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
tty-ask-password-agent
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
udev
udev-builtin-input-id: drop unused value
2026-05-18 02:55:56 +09:00
ukify
ukify: factor out method for value parsing in ConfigItem
2026-05-18 09:41:22 +09:00
update-done
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
update-utmp
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
user-sessions
…
userdb
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
validatefs
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
varlinkctl
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
vconsole
boot,vconsole: Propagate UEFI HII keyboard layout to the OS
2026-05-11 21:10:11 +02:00
veritysetup
tree-wide: get rid of old dispatch_verb
2026-05-16 18:37:10 +02:00
version
bpf: move all programs into src/bpf/ and consolidate meson logic
2026-04-22 16:49:36 +02:00
vmspawn
vmspawn: multifunction-pack pcie-root-ports on pcie.0
2026-05-13 23:48:53 +02:00
volatile-root
…
vpick
options: get rid of "on_error" parameter to FOREACH_OPTION
2026-04-30 11:12:33 +01:00
xdg-autostart-generator
many: fix remaining check-pointer-deref issues
2026-04-12 15:27:15 +02:00