linux-ext4 - Re: ext4: dev: Broken with CONFIG_JBD2=and CONFIG_EXT4

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Date:   Fri, 9 Oct 2020 16:10:15 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     "Theodore Y. Ts'o" <tytso@....edu>
Cc:     linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: ext4: dev: Broken with CONFIG_JBD2=and CONFIG_EXT4_FS=m

On Fri, Oct 9, 2020 at 3:49 PM Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> Hi Ted,
>
> with <ext4.git#dev> up to commit
> ab7b179af3f98772f2433ddc4ace6b7924a4e862 ("Merge branch
> 'hs/fast-commit-v9' into dev") I see some warnings (were reported via
> kernel-test-bot)...
>
> fs/jbd2/recovery.c:241:15: warning: unused variable 'seq' [-Wunused-variable]
> fs/ext4/fast_commit.c:1091:6: warning: variable 'start_time' is used
> uninitialized whenever 'if' condition is true
> [-Wsometimes-uninitialized]
> fs/ext4/fast_commit.c:1091:6: warning: variable 'start_time' is used
> uninitialized whenever '||' condition is true
> [-Wsometimes-uninitialized]
>
> ...and more severe a build breakage with CONFIG_JBD2=and CONFIG_EXT4_FS=m
>
> ERROR: modpost: "jbd2_fc_release_bufs" [fs/ext4/ext4.ko] undefined!
> ERROR: modpost: "jbd2_fc_init" [fs/ext4/ext4.ko] undefined!
> ERROR: modpost: "jbd2_fc_stop_do_commit" [fs/ext4/ext4.ko] undefined!
> ERROR: modpost: "jbd2_fc_stop" [fs/ext4/ext4.ko] undefined!
> ERROR: modpost: "jbd2_fc_start" [fs/ext4/ext4.ko] undefined!
>
> Looks like missing exports.
>

This fixes it...

$ git diff
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 8a51c1ad7088..e50aeefaa217 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -754,6 +754,7 @@ int jbd2_fc_start(journal_t *journal, tid_t tid)

       return 0;
}
+EXPORT_SYMBOL(jbd2_fc_start);

/*
 * Stop a fast commit. If fallback is set, this function starts commit of
@@ -778,11 +779,13 @@ int jbd2_fc_stop(journal_t *journal)
{
       return __jbd2_fc_stop(journal, 0, 0);
}
+EXPORT_SYMBOL(jbd2_fc_stop);

int jbd2_fc_stop_do_commit(journal_t *journal, tid_t tid)
{
       return __jbd2_fc_stop(journal, tid, 1);
}
+EXPORT_SYMBOL(jbd2_fc_stop_do_commit);

/* Return 1 when transaction with given tid has already committed. */
int jbd2_transaction_committed(journal_t *journal, tid_t tid)
@@ -954,6 +957,7 @@ int jbd2_fc_release_bufs(journal_t *journal)

       return 0;
}
+EXPORT_SYMBOL(jbd2_fc_release_bufs);

/*
 * Conversion of logical to physical block numbers for the journal
@@ -1389,6 +1393,7 @@ int jbd2_fc_init(journal_t *journal, int num_fc_blks)
               return -ENOMEM;
       return 0;
}
+EXPORT_SYMBOL(jbd2_fc_init);

/* jbd2_journal_init_dev and jbd2_journal_init_inode:
 *

- Sedat -

View attachment "jbd2-journal-fix-build-when-CONFIG_EXT4-as-module.diff" of type "text/x-patch" (1152 bytes)