package/f2fs-tools: fsck should use correct returncodes

fsck.f2fs does not implement the returncodes from the fsck interface.
This is particularly bad if systemd is used with a root f2fs partition,
as it will interpret the rc as order to reboot.

for thread & pending upstream fix see:
https://sourceforge.net/p/linux-f2fs/mailman/message/37079401/

Signed-off-by: Norbert Lange <nolange79@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

diff --git a/package/f2fs-tools/0002-fsck.f2fs-correct-return-value.patch b/package/f2fs-tools/0002-fsck.f2fs-correct-return-value.patch
new file mode 100644 (file)
index 0000000..b420e27
--- /dev/null
+++ b/package/f2fs-tools/0002-fsck.f2fs-correct-return-value.patch
@@ -0,0 +1,195 @@
+From eee12fe5e2e6c5f71bc7cbe25a608b730fd5362e Mon Sep 17 00:00:00 2001
+From: Chao Yu <yuchao0@huawei.com>
+Date: Fri, 7 Aug 2020 10:02:31 +0800
+Subject: [PATCH] fsck.f2fs: correct return value
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+As Norbert Lange reported:
+
+"
+$ fsck.f2fs -a /dev/mmcblk0p5; echo $?
+Info: Fix the reported corruption.
+Info: Mounted device!
+Info: Check FS only on RO mounted device
+Error: Failed to open the device!
+255
+"
+
+Michael Laß reminds:
+
+"
+I think the return value is exactly the problem here. See fsck(8) (
+https://linux.die.net/man/8/fsck) which specifies the return values.
+Systemd looks at these and decides how to proceed:
+
+https://github.com/systemd/systemd/blob/a859abf062cef1511e4879c4ee39c6036ebeaec8/src/fsck/fsck.c#L407
+
+That means, if fsck.f2fs returns 255, then
+the FSCK_SYSTEM_SHOULD_REBOOT bit is set and systemd will reboot.
+"
+
+So the problem here is fsck.f2fs didn't return correct value to userspace
+apps, result in later unexpected behavior of rebooting, let's fix this.
+
+Reported-by: Norbert Lange <nolange79@gmail.com>
+Reported-by: Michael Laß <bevan@bi-co.net>
+Signed-off-by: Chao Yu <yuchao0@huawei.com>
+Signed-off-by: Norbert Lange <nolange79@gmail.com>
+---
+ fsck/fsck.h | 11 +++++++++++
+ fsck/main.c | 45 +++++++++++++++++++++++++++++++--------------
+ 2 files changed, 42 insertions(+), 14 deletions(-)
+
+diff --git a/fsck/fsck.h b/fsck/fsck.h
+index ccf4a39..c8aeb06 100644
+--- a/fsck/fsck.h
++++ b/fsck/fsck.h
+@@ -13,6 +13,17 @@
+ 
+ #include "f2fs.h"
+ 
++enum {
++      FSCK_SUCCESS                 = 0,
++      FSCK_ERROR_CORRECTED         = 1 << 0,
++      FSCK_SYSTEM_SHOULD_REBOOT    = 1 << 1,
++      FSCK_ERRORS_LEFT_UNCORRECTED = 1 << 2,
++      FSCK_OPERATIONAL_ERROR       = 1 << 3,
++      FSCK_USAGE_OR_SYNTAX_ERROR   = 1 << 4,
++      FSCK_USER_CANCELLED          = 1 << 5,
++      FSCK_SHARED_LIB_ERROR        = 1 << 7,
++};
++
+ struct quota_ctx;
+ 
+ #define FSCK_UNMATCHED_EXTENT         0x00000001
+diff --git a/fsck/main.c b/fsck/main.c
+index 8c62a14..b0f2ec3 100644
+--- a/fsck/main.c
++++ b/fsck/main.c
+@@ -591,7 +591,7 @@ void f2fs_parse_options(int argc, char *argv[])
+       error_out(prog);
+ }
+ 
+-static void do_fsck(struct f2fs_sb_info *sbi)
++static int do_fsck(struct f2fs_sb_info *sbi)
+ {
+       struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
+       u32 flag = le32_to_cpu(ckpt->ckpt_flags);
+@@ -614,7 +614,7 @@ static void do_fsck(struct f2fs_sb_info *sbi)
+                       } else {
+                               MSG(0, "[FSCK] F2FS metadata   [Ok..]");
+                               fsck_free(sbi);
+-                              return;
++                              return FSCK_SUCCESS;
+                       }
+ 
+                       if (!c.ro)
+@@ -646,7 +646,7 @@ static void do_fsck(struct f2fs_sb_info *sbi)
+               ret = quota_init_context(sbi);
+               if (ret) {
+                       ASSERT_MSG("quota_init_context failure: %d", ret);
+-                      return;
++                      return FSCK_OPERATIONAL_ERROR;
+               }
+       }
+       fsck_chk_orphan_node(sbi);
+@@ -654,8 +654,14 @@ static void do_fsck(struct f2fs_sb_info *sbi)
+                       F2FS_FT_DIR, TYPE_INODE, &blk_cnt, NULL);
+       fsck_chk_quota_files(sbi);
+ 
+-      fsck_verify(sbi);
++      ret = fsck_verify(sbi);
+       fsck_free(sbi);
++
++      if (!c.bug_on)
++              return FSCK_SUCCESS;
++      if (!ret)
++              return FSCK_ERROR_CORRECTED;
++      return FSCK_ERRORS_LEFT_UNCORRECTED;
+ }
+ 
+ static void do_dump(struct f2fs_sb_info *sbi)
+@@ -763,7 +769,7 @@ static int do_sload(struct f2fs_sb_info *sbi)
+ int main(int argc, char **argv)
+ {
+       struct f2fs_sb_info *sbi;
+-      int ret = 0;
++      int ret = 0, ret2;
+       clock_t start = clock();
+ 
+       f2fs_init_configuration();
+@@ -771,10 +777,15 @@ int main(int argc, char **argv)
+       f2fs_parse_options(argc, argv);
+ 
+       if (c.func != DUMP && f2fs_devs_are_umounted() < 0) {
+-              if (errno == EBUSY)
++              if (errno == EBUSY) {
++                      if (c.func == FSCK)
++                              return FSCK_OPERATIONAL_ERROR;
+                       return -1;
++              }
+               if (!c.ro || c.func == DEFRAG) {
+                       MSG(0, "\tError: Not available on mounted device!\n");
++                      if (c.func == FSCK)
++                              return FSCK_OPERATIONAL_ERROR;
+                       return -1;
+               }
+ 
+@@ -789,8 +800,11 @@ int main(int argc, char **argv)
+       }
+ 
+       /* Get device */
+-      if (f2fs_get_device_info() < 0)
++      if (f2fs_get_device_info() < 0) {
++              if (c.func == FSCK)
++                      return FSCK_OPERATIONAL_ERROR;
+               return -1;
++      }
+ 
+ fsck_again:
+       memset(&gfsck, 0, sizeof(gfsck));
+@@ -808,7 +822,7 @@ fsck_again:
+ 
+       switch (c.func) {
+       case FSCK:
+-              do_fsck(sbi);
++              ret = do_fsck(sbi);
+               break;
+ #ifdef WITH_DUMP
+       case DUMP:
+@@ -856,8 +870,8 @@ fsck_again:
+                       char ans[255] = {0};
+ retry:
+                       printf("Do you want to fix this partition? [Y/N] ");
+-                      ret = scanf("%s", ans);
+-                      ASSERT(ret >= 0);
++                      ret2 = scanf("%s", ans);
++                      ASSERT(ret2 >= 0);
+                       if (!strcasecmp(ans, "y"))
+                               c.fix_on = 1;
+                       else if (!strcasecmp(ans, "n"))
+@@ -869,12 +883,15 @@ retry:
+                               goto fsck_again;
+               }
+       }
+-      ret = f2fs_finalize_device();
+-      if (ret < 0)
+-              return ret;
++      ret2 = f2fs_finalize_device();
++      if (ret2) {
++              if (c.func == FSCK)
++                      return FSCK_OPERATIONAL_ERROR;
++              return ret2;
++      }
+ 
+       printf("\nDone: %lf secs\n", (clock() - start) / (double)CLOCKS_PER_SEC);
+-      return 0;
++      return ret;
+ 
+ out_err:
+       if (sbi->ckpt)
+-- 
+2.27.0
+