[PATCH bpf-next v4 3/5] libbpf: Move directory creation into _pin() functions
From: Toke Høiland-Jørgensen <hidden>
Date: 2019-10-29 19:39:32
Also in:
bpf
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [library] (libbpf), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
From: Toke Høiland-Jørgensen <redacted> The existing pin_*() functions all try to create the parent directory before pinning. Move this check into the per-object _pin() functions instead. This ensures consistent behaviour when auto-pinning is added (which doesn't go through the top-level pin_maps() function), at the cost of a few more calls to mkdir(). Signed-off-by: Toke Høiland-Jørgensen <redacted> --- tools/lib/bpf/libbpf.c | 61 +++++++++++++++++++++++++++--------------------- 1 file changed, 34 insertions(+), 27 deletions(-)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index fd11f6aeb32c..895066393508 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c@@ -3805,6 +3805,28 @@ int bpf_object__load(struct bpf_object *obj) return bpf_object__load_xattr(&attr); } +static int make_parent_dir(const char *path) +{ + char *cp, errmsg[STRERR_BUFSIZE]; + char *dname, *dir; + int err = 0; + + dname = strdup(path); + if (dname == NULL) + return -ENOMEM; + + dir = dirname(dname); + if (mkdir(dir, 0700) && errno != EEXIST) + err = -errno; + + free(dname); + if (err) { + cp = libbpf_strerror_r(-err, errmsg, sizeof(errmsg)); + pr_warn("failed to mkdir %s: %s\n", path, cp); + } + return err; +} + static int check_path(const char *path) { char *cp, errmsg[STRERR_BUFSIZE];
@@ -3841,6 +3863,10 @@ int bpf_program__pin_instance(struct bpf_program *prog, const char *path, char *cp, errmsg[STRERR_BUFSIZE]; int err; + err = make_parent_dir(path); + if (err) + return err; + err = check_path(path); if (err) return err;
@@ -3894,25 +3920,14 @@ int bpf_program__unpin_instance(struct bpf_program *prog, const char *path, return 0; } -static int make_dir(const char *path) -{ - char *cp, errmsg[STRERR_BUFSIZE]; - int err = 0; - - if (mkdir(path, 0700) && errno != EEXIST) - err = -errno; - - if (err) { - cp = libbpf_strerror_r(-err, errmsg, sizeof(errmsg)); - pr_warn("failed to mkdir %s: %s\n", path, cp); - } - return err; -} - int bpf_program__pin(struct bpf_program *prog, const char *path) { int i, err; + err = make_parent_dir(path); + if (err) + return err; + err = check_path(path); if (err) return err;
@@ -3933,10 +3948,6 @@ int bpf_program__pin(struct bpf_program *prog, const char *path) return bpf_program__pin_instance(prog, path, 0); } - err = make_dir(path); - if (err) - return err; - for (i = 0; i < prog->instances.nr; i++) { char buf[PATH_MAX]; int len;
@@ -4059,6 +4070,10 @@ int bpf_map__pin(struct bpf_map *map, const char *path) } } + err = make_parent_dir(map->pin_path); + if (err) + return err; + err = check_path(map->pin_path); if (err) return err;
@@ -4153,10 +4168,6 @@ int bpf_object__pin_maps(struct bpf_object *obj, const char *path) return -ENOENT; } - err = make_dir(path); - if (err) - return err; - bpf_object__for_each_map(map, obj) { char *pin_path = NULL; char buf[PATH_MAX];
@@ -4243,10 +4254,6 @@ int bpf_object__pin_programs(struct bpf_object *obj, const char *path) return -ENOENT; } - err = make_dir(path); - if (err) - return err; - bpf_object__for_each_program(prog, obj) { char buf[PATH_MAX]; int len;