logfs: commit reservations under space pressure

[safe/jmp/linux-2.6] / fs / sync.c

diff --git a/fs/sync.c b/fs/sync.c
index 418727a..92b2281 100644 (file)
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -5,6 +5,7 @@
 #include <linux/kernel.h>
 #include <linux/file.h>
 #include <linux/fs.h>
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/writeback.h>
@@ -13,6 +14,7 @@
 #include <linux/pagemap.h>
 #include <linux/quotaops.h>
 #include <linux/buffer_head.h>
+#include <linux/backing-dev.h>
 #include "internal.h"
 
 #define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE| \
@@ -31,17 +33,17 @@ static int __sync_filesystem(struct super_block *sb, int wait)
         * This should be safe, as we require bdi backing to actually
         * write out data in the first place
         */
-       if (!sb->s_bdi)
+       if (!sb->s_bdi || sb->s_bdi == &noop_backing_dev_info)
                return 0;
 
-       /* Avoid doing twice syncing and cache pruning for quota sync */
-       if (!wait) {
-               writeout_quota_sb(sb, -1);
-               writeback_inodes_sb(sb);
-       } else {
-               sync_quota_sb(sb, -1);
+       if (sb->s_qcop && sb->s_qcop->quota_sync)
+               sb->s_qcop->quota_sync(sb, -1, wait);
+
+       if (wait)
                sync_inodes_sb(sb);
-       }
+       else
+               writeback_inodes_sb(sb);
+
        if (sb->s_op->sync_fs)
                sb->s_op->sync_fs(sb, wait);
        return __sync_blockdev(sb->s_bdev, wait);