Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [ 16/32] ext4: make sure the journal sb is written in ext4_clear_journal_err() | Date | Sun, 19 Aug 2012 20:57:12 -0700 |
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From: Greg KH <gregkh@linuxfoundation.org>
3.4-stable review patch. If anyone has any objections, please let me know.
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From: Theodore Ts'o <tytso@mit.edu>
commit d796c52ef0b71a988364f6109aeb63d79c5b116b upstream.
After we transfer set the EXT4_ERROR_FS bit in the file system superblock, it's not enough to call jbd2_journal_clear_err() to clear the error indication from journal superblock --- we need to call jbd2_journal_update_sb_errno() as well. Otherwise, when the root file system is mounted read-only, the journal is replayed, and the error indicator is transferred to the superblock --- but the s_errno field in the jbd2 superblock is left set (since although we cleared it in memory, we never flushed it out to disk).
This can end up confusing e2fsck. We should make e2fsck more robust in this case, but the kernel shouldn't be leaving things in this confused state, either.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/ext4/super.c | 1 + fs/jbd2/journal.c | 3 ++- include/linux/jbd2.h | 1 + 3 files changed, 4 insertions(+), 1 deletion(-)
--- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4227,6 +4227,7 @@ static void ext4_clear_journal_err(struc ext4_commit_super(sb, 1); jbd2_journal_clear_err(journal); + jbd2_journal_update_sb_errno(journal); } } --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -1340,7 +1340,7 @@ static void jbd2_mark_journal_empty(jour * Update a journal's errno. Write updated superblock to disk waiting for IO * to complete. */ -static void jbd2_journal_update_sb_errno(journal_t *journal) +void jbd2_journal_update_sb_errno(journal_t *journal) { journal_superblock_t *sb = journal->j_superblock; @@ -1352,6 +1352,7 @@ static void jbd2_journal_update_sb_errno jbd2_write_superblock(journal, WRITE_SYNC); } +EXPORT_SYMBOL(jbd2_journal_update_sb_errno); /* * Read the superblock for a given journal, performing initial --- a/include/linux/jbd2.h +++ b/include/linux/jbd2.h @@ -1091,6 +1091,7 @@ extern int jbd2_journal_destroy (j extern int jbd2_journal_recover (journal_t *journal); extern int jbd2_journal_wipe (journal_t *, int); extern int jbd2_journal_skip_recovery (journal_t *); +extern void jbd2_journal_update_sb_errno(journal_t *); extern void jbd2_journal_update_sb_log_tail (journal_t *, tid_t, unsigned long, int); extern void __jbd2_journal_abort_hard (journal_t *);
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