quota: Do not dirty bad dquots

Currently we mark dirty even dquots that are not active (i.e.,
initialization or reading failed for them). Thus later we have to check
whether dirty dquot is really active and just clear the dirty bit if
not. Avoid this complication by just never marking non-active dquot as
dirty.

Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index e1a155e8db155fdd221029933daf0cac4a6bbe75..0393581fe1a3aefa2851862b4fbd189ec4c389b9 100644 (file)
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -339,6 +339,9 @@ int dquot_mark_dquot_dirty(struct dquot *dquot)
 {
        int ret = 1;
 
+       if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
+               return 0;
+
        /* If quota is dirty already, we don't have to acquire dq_list_lock */
        if (test_bit(DQ_MOD_B, &dquot->dq_flags))
                return 1;
@@ -624,11 +627,9 @@ int dquot_writeback_dquots(struct super_block *sb, int type)
                while (!list_empty(dirty)) {
                        dquot = list_first_entry(dirty, struct dquot,
                                                 dq_dirty);
-                       /* Dirty and inactive can be only bad dquot... */
-                       if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
-                               clear_dquot_dirty(dquot);
-                               continue;
-                       }
+
+                       WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));
+
                        /* Now we have active dquot from which someone is
                         * holding reference so we can safely just increase
                         * use count */
@@ -759,7 +760,7 @@ we_slept:
                return;
        }
        /* Need to release dquot? */
-       if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
+       if (dquot_dirty(dquot)) {
                spin_unlock(&dq_list_lock);
                /* Commit dquot before releasing */
                ret = dquot->dq_sb->dq_op->write_dquot(dquot);
@@ -777,8 +778,6 @@ we_slept:
                }
                goto we_slept;
        }
-       /* Clear flag in case dquot was inactive (something bad happened) */
-       clear_dquot_dirty(dquot);
        if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
                spin_unlock(&dq_list_lock);
                dquot->dq_sb->dq_op->release_dquot(dquot);