From: Christian Brauner Date: Mon, 14 Oct 2024 14:31:22 +0000 (+0200) Subject: Merge patch series "ovl: file descriptors based layer setup" X-Git-Tag: v6.13-rc1~224^2~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=58439f6c48a9dc7a12765a6b37a5c43a542ea90f;p=thirdparty%2Fkernel%2Flinux.git Merge patch series "ovl: file descriptors based layer setup" Christian Brauner says: Currently overlayfs only allows specifying layers through path names. This is inconvenient for users such as systemd that want to assemble an overlayfs mount purely based on file descriptors. When porting overlayfs to the new mount api I already mentioned this. This enables user to specify both: fsconfig(fd_overlay, FSCONFIG_SET_FD, "upperdir+", NULL, fd_upper); fsconfig(fd_overlay, FSCONFIG_SET_FD, "workdir+", NULL, fd_work); fsconfig(fd_overlay, FSCONFIG_SET_FD, "lowerdir+", NULL, fd_lower1); fsconfig(fd_overlay, FSCONFIG_SET_FD, "lowerdir+", NULL, fd_lower2); in addition to: fsconfig(fd_overlay, FSCONFIG_SET_STRING, "upperdir+", "/upper", 0); fsconfig(fd_overlay, FSCONFIG_SET_STRING, "workdir+", "/work", 0); fsconfig(fd_overlay, FSCONFIG_SET_STRING, "lowerdir+", "/lower1", 0); fsconfig(fd_overlay, FSCONFIG_SET_STRING, "lowerdir+", "/lower2", 0); The selftest contain an example for this. * patches from https://lore.kernel.org/r/20241014-work-overlayfs-v3-0-32b3fed1286e@kernel.org: selftests: add overlayfs fd mounting selftests selftests: use shared header Documentation,ovl: document new file descriptor based layers ovl: specify layers via file descriptors fs: add helper to use mount option as path or fd Link: https://lore.kernel.org/r/20241014-work-overlayfs-v3-0-32b3fed1286e@kernel.org Signed-off-by: Christian Brauner --- 58439f6c48a9dc7a12765a6b37a5c43a542ea90f