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[LogFS] Only write journal if dirty

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This prevents unnecessary journal writes.  More importantly it prevents
an oops due to a journal write on failed mount.
This commit is contained in:
Joern Engel
2010-03-04 21:36:19 +01:00
parent 9421502b4f
commit c6d3830140
6 changed files with 19 additions and 13 deletions
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11
fs/logfs/journal.c
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@@ -724,14 +724,17 @@ static int logfs_write_obj_aliases(struct super_block *sb)
* bit wasteful, but robustness is more important. With this we can *always*
* erase all journal segments except the one containing the most recent commit.
*/
void logfs_write_anchor(struct inode *inode)
void logfs_write_anchor(struct super_block *sb)
{
struct super_block *sb = inode->i_sb;
struct logfs_super *super = logfs_super(sb);
struct logfs_area *area = super->s_journal_area;
int i, err;
BUG_ON(logfs_super(sb)->s_flags & LOGFS_SB_FLAG_SHUTDOWN);
if (!(super->s_flags & LOGFS_SB_FLAG_DIRTY))
return;
super->s_flags &= ~LOGFS_SB_FLAG_DIRTY;
BUG_ON(super->s_flags & LOGFS_SB_FLAG_SHUTDOWN);
mutex_lock(&super->s_journal_mutex);
/* Do this first or suffer corruption */
@@ -821,7 +824,7 @@ void do_logfs_journal_wl_pass(struct super_block *sb)
area->a_is_open = 0;
area->a_used_bytes = 0;
/* Write journal */
logfs_write_anchor(super->s_master_inode);
logfs_write_anchor(sb);
/* Write superblocks */
err = logfs_write_sb(sb);
BUG_ON(err);