Context |
Check |
Description |
bpf/vmtest-bpf-next-PR |
success
|
PR summary
|
bpf/vmtest-bpf-next-VM_Test-0 |
success
|
Logs for Lint
|
bpf/vmtest-bpf-next-VM_Test-1 |
success
|
Logs for ShellCheck
|
bpf/vmtest-bpf-next-VM_Test-2 |
success
|
Logs for Unittests
|
bpf/vmtest-bpf-next-VM_Test-3 |
success
|
Logs for Validate matrix.py
|
bpf/vmtest-bpf-next-VM_Test-5 |
success
|
Logs for aarch64-gcc / build-release
|
bpf/vmtest-bpf-next-VM_Test-4 |
success
|
Logs for aarch64-gcc / build / build for aarch64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-9 |
success
|
Logs for aarch64-gcc / test (test_verifier, false, 360) / test_verifier on aarch64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-10 |
success
|
Logs for aarch64-gcc / veristat
|
bpf/vmtest-bpf-next-VM_Test-12 |
success
|
Logs for s390x-gcc / build-release
|
bpf/vmtest-bpf-next-VM_Test-6 |
success
|
Logs for aarch64-gcc / test (test_maps, false, 360) / test_maps on aarch64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-7 |
success
|
Logs for aarch64-gcc / test (test_progs, false, 360) / test_progs on aarch64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-8 |
success
|
Logs for aarch64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on aarch64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-11 |
success
|
Logs for s390x-gcc / build / build for s390x with gcc
|
bpf/vmtest-bpf-next-VM_Test-16 |
success
|
Logs for s390x-gcc / veristat
|
bpf/vmtest-bpf-next-VM_Test-17 |
success
|
Logs for set-matrix
|
bpf/vmtest-bpf-next-VM_Test-18 |
success
|
Logs for x86_64-gcc / build / build for x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-19 |
success
|
Logs for x86_64-gcc / build-release
|
bpf/vmtest-bpf-next-VM_Test-27 |
success
|
Logs for x86_64-llvm-17 / build / build for x86_64 with llvm-17
|
bpf/vmtest-bpf-next-VM_Test-28 |
success
|
Logs for x86_64-llvm-17 / build-release / build for x86_64 with llvm-17-O2
|
bpf/vmtest-bpf-next-VM_Test-33 |
success
|
Logs for x86_64-llvm-17 / veristat
|
bpf/vmtest-bpf-next-VM_Test-34 |
success
|
Logs for x86_64-llvm-18 / build / build for x86_64 with llvm-18
|
bpf/vmtest-bpf-next-VM_Test-41 |
success
|
Logs for x86_64-llvm-18 / veristat
|
bpf/vmtest-bpf-next-VM_Test-15 |
success
|
Logs for s390x-gcc / test (test_verifier, false, 360) / test_verifier on s390x with gcc
|
bpf/vmtest-bpf-next-VM_Test-35 |
success
|
Logs for x86_64-llvm-18 / build-release / build for x86_64 with llvm-18-O2
|
bpf/vmtest-bpf-next-VM_Test-14 |
success
|
Logs for s390x-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on s390x with gcc
|
bpf/vmtest-bpf-next-VM_Test-20 |
success
|
Logs for x86_64-gcc / test (test_maps, false, 360) / test_maps on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-13 |
success
|
Logs for s390x-gcc / test (test_progs, false, 360) / test_progs on s390x with gcc
|
bpf/vmtest-bpf-next-VM_Test-21 |
success
|
Logs for x86_64-gcc / test (test_progs, false, 360) / test_progs on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-23 |
success
|
Logs for x86_64-gcc / test (test_progs_no_alu32_parallel, true, 30) / test_progs_no_alu32_parallel on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-22 |
success
|
Logs for x86_64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-24 |
success
|
Logs for x86_64-gcc / test (test_progs_parallel, true, 30) / test_progs_parallel on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-25 |
success
|
Logs for x86_64-gcc / test (test_verifier, false, 360) / test_verifier on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-26 |
success
|
Logs for x86_64-gcc / veristat / veristat on x86_64 with gcc
|
bpf/vmtest-bpf-next-VM_Test-29 |
success
|
Logs for x86_64-llvm-17 / test (test_maps, false, 360) / test_maps on x86_64 with llvm-17
|
bpf/vmtest-bpf-next-VM_Test-32 |
success
|
Logs for x86_64-llvm-17 / test (test_verifier, false, 360) / test_verifier on x86_64 with llvm-17
|
bpf/vmtest-bpf-next-VM_Test-30 |
success
|
Logs for x86_64-llvm-17 / test (test_progs, false, 360) / test_progs on x86_64 with llvm-17
|
bpf/vmtest-bpf-next-VM_Test-36 |
success
|
Logs for x86_64-llvm-18 / test (test_maps, false, 360) / test_maps on x86_64 with llvm-18
|
bpf/vmtest-bpf-next-VM_Test-40 |
success
|
Logs for x86_64-llvm-18 / test (test_verifier, false, 360) / test_verifier on x86_64 with llvm-18
|
bpf/vmtest-bpf-next-VM_Test-31 |
success
|
Logs for x86_64-llvm-17 / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with llvm-17
|
bpf/vmtest-bpf-next-VM_Test-37 |
success
|
Logs for x86_64-llvm-18 / test (test_progs, false, 360) / test_progs on x86_64 with llvm-18
|
bpf/vmtest-bpf-next-VM_Test-38 |
success
|
Logs for x86_64-llvm-18 / test (test_progs_cpuv4, false, 360) / test_progs_cpuv4 on x86_64 with llvm-18
|
bpf/vmtest-bpf-next-VM_Test-39 |
success
|
Logs for x86_64-llvm-18 / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with llvm-18
|
netdev/series_format |
success
|
Posting correctly formatted
|
netdev/tree_selection |
success
|
Clearly marked for bpf-next, async
|
netdev/ynl |
success
|
Generated files up to date;
no warnings/errors;
no diff in generated;
|
netdev/fixes_present |
success
|
Fixes tag not required for -next series
|
netdev/header_inline |
success
|
No static functions without inline keyword in header files
|
netdev/build_32bit |
fail
|
Errors and warnings before: 5 this patch: 7
|
netdev/build_tools |
success
|
No tools touched, skip
|
netdev/cc_maintainers |
success
|
CCed 14 of 14 maintainers
|
netdev/build_clang |
fail
|
Errors and warnings before: 4 this patch: 6
|
netdev/verify_signedoff |
success
|
Signed-off-by tag matches author and committer
|
netdev/deprecated_api |
success
|
None detected
|
netdev/check_selftest |
success
|
No net selftest shell script
|
netdev/verify_fixes |
success
|
No Fixes tag
|
netdev/build_allmodconfig_warn |
fail
|
Errors and warnings before: 8 this patch: 14
|
netdev/checkpatch |
warning
|
CHECK: Alignment should match open parenthesis
WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
WARNING: line length of 85 exceeds 80 columns
WARNING: line length of 97 exceeds 80 columns
|
netdev/build_clang_rust |
success
|
No Rust files in patch. Skipping build
|
netdev/kdoc |
fail
|
Errors and warnings before: 0 this patch: 5
|
netdev/source_inline |
success
|
Was 0 now: 0
|
@@ -53,3 +53,4 @@ obj-$(CONFIG_BPF_SYSCALL) += relo_core.o
obj-$(CONFIG_BPF_SYSCALL) += btf_iter.o
obj-$(CONFIG_BPF_SYSCALL) += btf_relocate.o
obj-$(CONFIG_BPF_SYSCALL) += kmem_cache_iter.o
+obj-$(CONFIG_BPF_SYSCALL) += crib/
new file mode 100644
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_BPF_SYSCALL) += crib.o files.o
new file mode 100644
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Checkpoint/Restore In eBPF (CRIB)
+ */
+
+#include <linux/bpf.h>
+#include <linux/btf.h>
+#include <linux/btf_ids.h>
+
+BTF_KFUNCS_START(bpf_crib_kfuncs)
+
+BTF_ID_FLAGS(func, bpf_iter_task_file_new, KF_ITER_NEW | KF_TRUSTED_ARGS)
+BTF_ID_FLAGS(func, bpf_iter_task_file_next, KF_ITER_NEXT | KF_RET_NULL)
+BTF_ID_FLAGS(func, bpf_iter_task_file_get_fd)
+BTF_ID_FLAGS(func, bpf_iter_task_file_destroy, KF_ITER_DESTROY)
+
+BTF_KFUNCS_END(bpf_crib_kfuncs)
+
+static const struct btf_kfunc_id_set bpf_crib_kfunc_set = {
+ .owner = THIS_MODULE,
+ .set = &bpf_crib_kfuncs,
+};
+
+static int __init bpf_crib_init(void)
+{
+ return register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &bpf_crib_kfunc_set);
+}
+
+late_initcall(bpf_crib_init);
new file mode 100644
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/btf.h>
+#include <linux/file.h>
+#include <linux/fdtable.h>
+#include <linux/net.h>
+
+struct bpf_iter_task_file {
+ __u64 __opaque[3];
+} __aligned(8);
+
+struct bpf_iter_task_file_kern {
+ struct task_struct *task;
+ struct file *file;
+ int fd;
+} __aligned(8);
+
+__bpf_kfunc_start_defs();
+
+/**
+ * bpf_iter_task_file_new() - Initialize a new task file iterator for a task,
+ * used to iterate over all files opened by a specified task
+ *
+ * @it: the new bpf_iter_task_file to be created
+ * @task: a pointer pointing to a task to be iterated over
+ */
+__bpf_kfunc int bpf_iter_task_file_new(struct bpf_iter_task_file *it,
+ struct task_struct *task)
+{
+ struct bpf_iter_task_file_kern *kit = (void *)it;
+
+ BUILD_BUG_ON(sizeof(struct bpf_iter_task_file_kern) > sizeof(struct bpf_iter_task_file));
+ BUILD_BUG_ON(__alignof__(struct bpf_iter_task_file_kern) !=
+ __alignof__(struct bpf_iter_task_file));
+
+ kit->task = task;
+ kit->fd = -1;
+ kit->file = NULL;
+
+ return 0;
+}
+
+/**
+ * bpf_iter_task_file_next() - Get the next file in bpf_iter_task_file
+ *
+ * bpf_iter_task_file_next acquires a reference to the returned struct file.
+ *
+ * The reference to struct file acquired by the previous
+ * bpf_iter_task_file_next() is released in the next bpf_iter_task_file_next(),
+ * and the last reference is released in the last bpf_iter_task_file_next()
+ * that returns NULL.
+ *
+ * @it: the bpf_iter_task_file to be checked
+ *
+ * @returns a pointer to the struct file of the next file if further files
+ * are available, otherwise returns NULL
+ */
+__bpf_kfunc struct file *bpf_iter_task_file_next(struct bpf_iter_task_file *it)
+{
+ struct bpf_iter_task_file_kern *kit = (void *)it;
+
+ if (kit->file)
+ fput(kit->file);
+
+ kit->fd++;
+
+ rcu_read_lock();
+ kit->file = task_lookup_next_fdget_rcu(kit->task, &kit->fd);
+ rcu_read_unlock();
+
+ return kit->file;
+}
+
+/**
+ * bpf_iter_task_file_get_fd() - Get the file descriptor corresponding to
+ * the file in the current iteration
+ *
+ * @it: the bpf_iter_task_file to be checked
+ *
+ * @returns the file descriptor
+ */
+__bpf_kfunc int bpf_iter_task_file_get_fd(struct bpf_iter_task_file *it__iter)
+{
+ struct bpf_iter_task_file_kern *kit = (void *)it__iter;
+
+ return kit->fd;
+}
+
+/**
+ * bpf_iter_task_file_destroy() - Destroy a bpf_iter_task_file
+ *
+ * If the iterator does not iterate to the end, then the last
+ * struct file reference is released at this time.
+ *
+ * @it: the bpf_iter_task_file to be destroyed
+ */
+__bpf_kfunc void bpf_iter_task_file_destroy(struct bpf_iter_task_file *it)
+{
+ struct bpf_iter_task_file_kern *kit = (void *)it;
+
+ if (kit->file)
+ fput(kit->file);
+}
+
+__bpf_kfunc_end_defs();
This patch adds the open-coded iterator style process file iterator kfuncs bpf_iter_task_file_{new,next,destroy} that iterates over all files opened by the specified process. In addition, this patch adds bpf_iter_task_file_get_fd() getter to get the file descriptor corresponding to the file in the current iteration. The reference to struct file acquired by the previous bpf_iter_task_file_next() is released in the next bpf_iter_task_file_next(), and the last reference is released in the last bpf_iter_task_file_next() that returns NULL. In the bpf_iter_task_file_destroy(), if the iterator does not iterate to the end, then the last struct file reference is released at this time. Signed-off-by: Juntong Deng <juntong.deng@outlook.com> --- kernel/bpf/Makefile | 1 + kernel/bpf/crib/Makefile | 3 ++ kernel/bpf/crib/crib.c | 29 +++++++++++ kernel/bpf/crib/files.c | 105 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 138 insertions(+) create mode 100644 kernel/bpf/crib/Makefile create mode 100644 kernel/bpf/crib/crib.c create mode 100644 kernel/bpf/crib/files.c