adamrk · adamrk · Apr 27, 2021 · Apr 27, 2021 · Apr 28, 2021
diff --git a/.github/workflows/busybox.config b/.github/workflows/busybox.config
@@ -196,7 +196,7 @@ CONFIG_GZIP_FAST=0
 # Coreutils
 #
 # CONFIG_BASENAME is not set
-# CONFIG_CAT is not set
+CONFIG_CAT=y
 # CONFIG_FEATURE_CATN is not set
 # CONFIG_FEATURE_CATV is not set
 # CONFIG_CHGRP is not set
@@ -209,7 +209,7 @@ CONFIG_GZIP_FAST=0
 # CONFIG_CP is not set
 # CONFIG_FEATURE_CP_LONG_OPTIONS is not set
 # CONFIG_FEATURE_CP_REFLINK is not set
-# CONFIG_CUT is not set
+CONFIG_CUT=y
 # CONFIG_DATE is not set
 # CONFIG_FEATURE_DATE_ISOFMT is not set
 # CONFIG_FEATURE_DATE_NANO is not set
@@ -263,9 +263,9 @@ CONFIG_GZIP_FAST=0
 # CONFIG_SHA512SUM is not set
 # CONFIG_SHA3SUM is not set
 # CONFIG_FEATURE_MD5_SHA1_SUM_CHECK is not set
-# CONFIG_MKDIR is not set
+CONFIG_MKDIR=y
 # CONFIG_MKFIFO is not set
-# CONFIG_MKNOD is not set
+CONFIG_MKNOD=y
 # CONFIG_MKTEMP is not set
 # CONFIG_MV is not set
 # CONFIG_NICE is not set
@@ -280,7 +280,7 @@ CONFIG_GZIP_FAST=0
 # CONFIG_READLINK is not set
 # CONFIG_FEATURE_READLINK_FOLLOW is not set
 # CONFIG_REALPATH is not set
-# CONFIG_RM is not set
+CONFIG_RM=y
 # CONFIG_RMDIR is not set
 # CONFIG_SEQ is not set
 # CONFIG_SHRED is not set
@@ -449,7 +449,7 @@ CONFIG_FEATURE_VI_UNDO_QUEUE_MAX=0
 # CONFIG_FEATURE_FIND_REGEX is not set
 # CONFIG_FEATURE_FIND_CONTEXT is not set
 # CONFIG_FEATURE_FIND_LINKS is not set
-# CONFIG_GREP is not set
+CONFIG_GREP=y
 # CONFIG_EGREP is not set
 # CONFIG_FGREP is not set
 # CONFIG_FEATURE_GREP_CONTEXT is not set
@@ -635,7 +635,7 @@ CONFIG_DEFAULT_DEPMOD_FILE="modules.dep"
 # CONFIG_MKSWAP is not set
 # CONFIG_FEATURE_MKSWAP_UUID is not set
 # CONFIG_MORE is not set
-# CONFIG_MOUNT is not set
+CONFIG_MOUNT=y
 # CONFIG_FEATURE_MOUNT_FAKE is not set
 # CONFIG_FEATURE_MOUNT_VERBOSE is not set
 # CONFIG_FEATURE_MOUNT_HELPERS is not set

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
@@ -304,6 +304,15 @@ jobs:
           grep '] rust_semaphore_c: Rust semaphore sample (in C, for comparison) (init)$' qemu-stdout.log
           grep '] rust_semaphore_c: Rust semaphore sample (in C, for comparison) (exit)$' qemu-stdout.log
 
+      - run: |
+          grep '] rust_seq_file: Rust seq_file sample (init)$'   qemu-stdout.log
+          grep '] rust_seq_file: Rust seq_file sample (exit)$'   qemu-stdout.log
+          if [ $(grep -c 'rust_seq_file: device opened this many times: 2' qemu-stdout.log) -ne 3 ]; then
+            exit 1; 
+          else 
+            exit 0;
+          fi
+
       # Report
       - run: |
           ls -l \

diff --git a/.github/workflows/kernel-arm-debug.config b/.github/workflows/kernel-arm-debug.config
@@ -1665,6 +1665,7 @@ CONFIG_SAMPLE_RUST_MISCDEV=m
 CONFIG_SAMPLE_RUST_STACK_PROBING=m
 CONFIG_SAMPLE_RUST_SEMAPHORE=m
 CONFIG_SAMPLE_RUST_SEMAPHORE_C=m
+CONFIG_SAMPLE_RUST_SEQ_FILE=m
 # CONFIG_STRICT_DEVMEM is not set
 
 #

diff --git a/.github/workflows/kernel-arm-release.config b/.github/workflows/kernel-arm-release.config
@@ -1589,6 +1589,7 @@ CONFIG_SAMPLE_RUST_MISCDEV=m
 CONFIG_SAMPLE_RUST_STACK_PROBING=m
 CONFIG_SAMPLE_RUST_SEMAPHORE=m
 CONFIG_SAMPLE_RUST_SEMAPHORE_C=m
+CONFIG_SAMPLE_RUST_SEQ_FILE=m
 # CONFIG_STRICT_DEVMEM is not set
 
 #

diff --git a/.github/workflows/kernel-arm64-debug.config b/.github/workflows/kernel-arm64-debug.config
@@ -1069,7 +1069,7 @@ CONFIG_DCACHE_WORD_ACCESS=y
 #
 # Pseudo filesystems
 #
-# CONFIG_PROC_FS is not set
+CONFIG_PROC_FS=y
 # CONFIG_PROC_CHILDREN is not set
 # CONFIG_SYSFS is not set
 # CONFIG_HUGETLBFS is not set
@@ -1431,6 +1431,7 @@ CONFIG_SAMPLE_RUST_MISCDEV=m
 CONFIG_SAMPLE_RUST_STACK_PROBING=m
 CONFIG_SAMPLE_RUST_SEMAPHORE=m
 CONFIG_SAMPLE_RUST_SEMAPHORE_C=m
+CONFIG_SAMPLE_RUST_SEQ_FILE=m
 
 #
 # arm64 Debugging

diff --git a/.github/workflows/kernel-arm64-release.config b/.github/workflows/kernel-arm64-release.config
@@ -1064,7 +1064,7 @@ CONFIG_DCACHE_WORD_ACCESS=y
 #
 # Pseudo filesystems
 #
-# CONFIG_PROC_FS is not set
+CONFIG_PROC_FS=y
 # CONFIG_PROC_CHILDREN is not set
 # CONFIG_SYSFS is not set
 # CONFIG_HUGETLBFS is not set
@@ -1349,6 +1349,7 @@ CONFIG_SAMPLE_RUST_MISCDEV=m
 CONFIG_SAMPLE_RUST_STACK_PROBING=m
 CONFIG_SAMPLE_RUST_SEMAPHORE=m
 CONFIG_SAMPLE_RUST_SEMAPHORE_C=m
+CONFIG_SAMPLE_RUST_SEQ_FILE=m
 
 #
 # arm64 Debugging

diff --git a/.github/workflows/kernel-ppc64le-debug.config b/.github/workflows/kernel-ppc64le-debug.config
@@ -1491,6 +1491,7 @@ CONFIG_SAMPLE_RUST_MISCDEV=m
 CONFIG_SAMPLE_RUST_STACK_PROBING=m
 CONFIG_SAMPLE_RUST_SEMAPHORE=m
 CONFIG_SAMPLE_RUST_SEMAPHORE_C=m
+CONFIG_SAMPLE_RUST_SEQ_FILE=m
 CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED=y
 # CONFIG_STRICT_DEVMEM is not set
 

diff --git a/.github/workflows/kernel-ppc64le-release.config b/.github/workflows/kernel-ppc64le-release.config
@@ -1453,6 +1453,7 @@ CONFIG_SAMPLE_RUST_MISCDEV=m
 CONFIG_SAMPLE_RUST_STACK_PROBING=m
 CONFIG_SAMPLE_RUST_SEMAPHORE=m
 CONFIG_SAMPLE_RUST_SEMAPHORE_C=m
+CONFIG_SAMPLE_RUST_SEQ_FILE=m
 CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED=y
 # CONFIG_STRICT_DEVMEM is not set
 

diff --git a/.github/workflows/kernel-x86_64-debug.config b/.github/workflows/kernel-x86_64-debug.config
@@ -1059,7 +1059,7 @@ CONFIG_DCACHE_WORD_ACCESS=y
 #
 # Pseudo filesystems
 #
-# CONFIG_PROC_FS is not set
+CONFIG_PROC_FS=y
 # CONFIG_PROC_CHILDREN is not set
 CONFIG_KERNFS=y
 CONFIG_SYSFS=y
@@ -1443,6 +1443,7 @@ CONFIG_SAMPLE_RUST_MISCDEV=m
 CONFIG_SAMPLE_RUST_STACK_PROBING=m
 CONFIG_SAMPLE_RUST_SEMAPHORE=m
 CONFIG_SAMPLE_RUST_SEMAPHORE_C=m
+CONFIG_SAMPLE_RUST_SEQ_FILE=m
 CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED=y
 # CONFIG_STRICT_DEVMEM is not set
 

diff --git a/.github/workflows/kernel-x86_64-release.config b/.github/workflows/kernel-x86_64-release.config
@@ -1391,6 +1391,7 @@ CONFIG_SAMPLE_RUST_MISCDEV=m
 CONFIG_SAMPLE_RUST_STACK_PROBING=m
 CONFIG_SAMPLE_RUST_SEMAPHORE=m
 CONFIG_SAMPLE_RUST_SEMAPHORE_C=m
+CONFIG_SAMPLE_RUST_SEQ_FILE=m
 CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED=y
 # CONFIG_STRICT_DEVMEM is not set
 

diff --git a/.github/workflows/qemu-init.sh b/.github/workflows/qemu-init.sh
@@ -1,5 +1,16 @@
 #!/bin/sh
 
+busybox insmod rust_seq_file.ko
+busybox mkdir proc
+busybox mount -t proc proc /proc
+export RUST_SEQ_MINOR=$(busybox cat /proc/misc | busybox grep rust_seq_file | busybox cut -d ' ' -f 1)
+busybox mknod /dev/rust_seq_file0 c 10 $RUST_SEQ_MINOR
+busybox cat /dev/rust_seq_file0
+busybox cat /dev/rust_seq_file0
+busybox cat /proc/rust_seq_file
+busybox rm /dev/rust_seq_file0
+busybox rmmod rust_seq_file.ko
+
 busybox insmod rust_minimal.ko
 busybox  rmmod rust_minimal.ko
 

diff --git a/.github/workflows/qemu-initramfs.desc b/.github/workflows/qemu-initramfs.desc
@@ -14,6 +14,7 @@ file    /rust_miscdev.ko            samples/rust/rust_miscdev.ko            0755
 file    /rust_stack_probing.ko      samples/rust/rust_stack_probing.ko      0755 0 0
 file    /rust_semaphore.ko          samples/rust/rust_semaphore.ko          0755 0 0
 file    /rust_semaphore_c.ko        samples/rust/rust_semaphore_c.ko        0755 0 0
+file    /rust_seq_file.ko           samples/rust/rust_seq_file.ko           0755 0 0
 
 file    /rust_module_parameters_loadable_default.ko  samples/rust/rust_module_parameters_loadable_default.ko  0755 0 0
 file    /rust_module_parameters_loadable_custom.ko   samples/rust/rust_module_parameters_loadable_custom.ko   0755 0 0
diff --git a/rust/kernel/bindings_helper.h b/rust/kernel/bindings_helper.h
@@ -3,7 +3,9 @@
 #include <linux/cdev.h>
 #include <linux/fs.h>
 #include <linux/module.h>
+#include <linux/proc_fs.h>
 #include <linux/random.h>
+#include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/sysctl.h>
 #include <linux/uaccess.h>

diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
@@ -52,6 +52,7 @@ pub mod module_param;
 pub mod prelude;
 pub mod print;
 pub mod random;
+pub mod seq_file;
 mod static_assert;
 pub mod sync;