[PATCH 1/2] JBD2: Allow feature checks before journal recovery
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From: Patrick J. LoPresti on 11 Jul 2010 13:10 Before we start accessing a huge (> 16 TiB) OCFS2 volume, we need to confirm that its journal supports 64-bit offsets. So we need to check the journal's feature bits before recovering the journal. This is not possible with JBD2 at present, because the journal superblock (where the feature bits reside) is not loaded from disk until the journal is recovered. This patch loads the journal superblock in jbd2_journal_check_used_features() if it has not already been loaded, allowing us to check the feature bits before journal recovery. Signed-off-by: Patrick LoPresti <lopresti(a)gmail.com> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index bc2ff59..c5a864f 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -1365,6 +1365,8 @@ int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat, if (!compat && !ro && !incompat) return 1; + if (journal_get_superblock(journal)) + return 0; if (journal->j_format_version == 1) return 0; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |