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authorYongqiang Yang <xiaoqiangnk@gmail.com>2011-11-19 13:34:29 +0400
committerJan Kara <jack@suse.cz>2011-11-22 04:20:53 +0400
commit8c111b3f56332a216b18cd57950bdf04ac8f2a98 (patch)
tree9295744be006082391c9bfeed2cabf43b29cc4ea /fs/jbd/revoke.c
parent63894ab9f63a688f6b0b8cdd01ac0a9f36d507b8 (diff)
downloadlinux-8c111b3f56332a216b18cd57950bdf04ac8f2a98.tar.xz
jbd: clear revoked flag on buffers before a new transaction started
Currently, we clear revoked flag only when a block is reused. However, this can tigger a false journal error. Consider a situation when a block is used as a meta block and is deleted(revoked) in ordered mode, then the block is allocated as a data block to a file. At this moment, user changes the file's journal mode from ordered to journaled and truncates the file. The block will be considered re-revoked by journal because it has revoked flag still pending from the last transaction and an assertion triggers. We fix the problem by keeping the revoked status more uptodate - we clear revoked flag when switching revoke tables to reflect there is no revoked buffers in current transaction any more. Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/jbd/revoke.c')
-rw-r--r--fs/jbd/revoke.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/fs/jbd/revoke.c b/fs/jbd/revoke.c
index 305a90763154..25c713e7071c 100644
--- a/fs/jbd/revoke.c
+++ b/fs/jbd/revoke.c
@@ -47,6 +47,10 @@
* overwriting the new data. We don't even need to clear the revoke
* bit here.
*
+ * We cache revoke status of a buffer in the current transaction in b_states
+ * bits. As the name says, revokevalid flag indicates that the cached revoke
+ * status of a buffer is valid and we can rely on the cached status.
+ *
* Revoke information on buffers is a tri-state value:
*
* RevokeValid clear: no cached revoke status, need to look it up
@@ -479,6 +483,36 @@ int journal_cancel_revoke(handle_t *handle, struct journal_head *jh)
return did_revoke;
}
+/*
+ * journal_clear_revoked_flags clears revoked flag of buffers in
+ * revoke table to reflect there is no revoked buffer in the next
+ * transaction which is going to be started.
+ */
+void journal_clear_buffer_revoked_flags(journal_t *journal)
+{
+ struct jbd_revoke_table_s *revoke = journal->j_revoke;
+ int i = 0;
+
+ for (i = 0; i < revoke->hash_size; i++) {
+ struct list_head *hash_list;
+ struct list_head *list_entry;
+ hash_list = &revoke->hash_table[i];
+
+ list_for_each(list_entry, hash_list) {
+ struct jbd_revoke_record_s *record;
+ struct buffer_head *bh;
+ record = (struct jbd_revoke_record_s *)list_entry;
+ bh = __find_get_block(journal->j_fs_dev,
+ record->blocknr,
+ journal->j_blocksize);
+ if (bh) {
+ clear_buffer_revoked(bh);
+ __brelse(bh);
+ }
+ }
+ }
+}
+
/* journal_switch_revoke table select j_revoke for next transaction
* we do not want to suspend any processing until all revokes are
* written -bzzz