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-rw-r--r--fs/jbd/checkpoint.c31
1 files changed, 24 insertions, 7 deletions
diff --git a/fs/jbd/checkpoint.c b/fs/jbd/checkpoint.c
index 1bd8d4acc6f2..61f32f3868cd 100644
--- a/fs/jbd/checkpoint.c
+++ b/fs/jbd/checkpoint.c
@@ -115,7 +115,7 @@ static int __try_to_free_cp_buf(struct journal_head *jh)
115 */ 115 */
116void __log_wait_for_space(journal_t *journal) 116void __log_wait_for_space(journal_t *journal)
117{ 117{
118 int nblocks; 118 int nblocks, space_left;
119 assert_spin_locked(&journal->j_state_lock); 119 assert_spin_locked(&journal->j_state_lock);
120 120
121 nblocks = jbd_space_needed(journal); 121 nblocks = jbd_space_needed(journal);
@@ -128,25 +128,42 @@ void __log_wait_for_space(journal_t *journal)
128 /* 128 /*
129 * Test again, another process may have checkpointed while we 129 * Test again, another process may have checkpointed while we
130 * were waiting for the checkpoint lock. If there are no 130 * were waiting for the checkpoint lock. If there are no
131 * outstanding transactions there is nothing to checkpoint and 131 * transactions ready to be checkpointed, try to recover
132 * we can't make progress. Abort the journal in this case. 132 * journal space by calling cleanup_journal_tail(), and if
133 * that doesn't work, by waiting for the currently committing
134 * transaction to complete. If there is absolutely no way
135 * to make progress, this is either a BUG or corrupted
136 * filesystem, so abort the journal and leave a stack
137 * trace for forensic evidence.
133 */ 138 */
134 spin_lock(&journal->j_state_lock); 139 spin_lock(&journal->j_state_lock);
135 spin_lock(&journal->j_list_lock); 140 spin_lock(&journal->j_list_lock);
136 nblocks = jbd_space_needed(journal); 141 nblocks = jbd_space_needed(journal);
137 if (__log_space_left(journal) < nblocks) { 142 space_left = __log_space_left(journal);
143 if (space_left < nblocks) {
138 int chkpt = journal->j_checkpoint_transactions != NULL; 144 int chkpt = journal->j_checkpoint_transactions != NULL;
145 tid_t tid = 0;
139 146
147 if (journal->j_committing_transaction)
148 tid = journal->j_committing_transaction->t_tid;
140 spin_unlock(&journal->j_list_lock); 149 spin_unlock(&journal->j_list_lock);
141 spin_unlock(&journal->j_state_lock); 150 spin_unlock(&journal->j_state_lock);
142 if (chkpt) { 151 if (chkpt) {
143 log_do_checkpoint(journal); 152 log_do_checkpoint(journal);
153 } else if (cleanup_journal_tail(journal) == 0) {
154 /* We were able to recover space; yay! */
155 ;
156 } else if (tid) {
157 log_wait_commit(journal, tid);
144 } else { 158 } else {
145 printk(KERN_ERR "%s: no transactions\n", 159 printk(KERN_ERR "%s: needed %d blocks and "
146 __func__); 160 "only had %d space available\n",
161 __func__, nblocks, space_left);
162 printk(KERN_ERR "%s: no way to get more "
163 "journal space\n", __func__);
164 WARN_ON(1);
147 journal_abort(journal, 0); 165 journal_abort(journal, 0);
148 } 166 }
149
150 spin_lock(&journal->j_state_lock); 167 spin_lock(&journal->j_state_lock);
151 } else { 168 } else {
152 spin_unlock(&journal->j_list_lock); 169 spin_unlock(&journal->j_list_lock);