NFS: Throttle page dirtying while we're flushing to disk

[linux-2.6-omap-h63xx.git] / fs / nfs / write.c

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 1a999939fedf8cce2007e00f6575817a71cf18f5..36fd35e0de835314757ca10307b43138afb2260b 100644 (file)
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -313,19 +313,34 @@ static int nfs_writepages_callback(struct page *page, struct writeback_control *
 int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
 {
        struct inode *inode = mapping->host;
+       unsigned long *bitlock = &NFS_I(inode)->flags;
        struct nfs_pageio_descriptor pgio;
        int err;
 
+       /* Stop dirtying of new pages while we sync */
+       err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING,
+                       nfs_wait_bit_killable, TASK_KILLABLE);
+       if (err)
+               goto out_err;
+
        nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
 
        nfs_pageio_init_write(&pgio, inode, wb_priority(wbc));
        err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
        nfs_pageio_complete(&pgio);
+
+       clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
+       smp_mb__after_clear_bit();
+       wake_up_bit(bitlock, NFS_INO_FLUSHING);
+
        if (err < 0)
-               return err;
-       if (pgio.pg_error < 0)
-               return pgio.pg_error;
+               goto out_err;
+       err = pgio.pg_error;
+       if (err < 0)
+               goto out_err;
        return 0;
+out_err:
+       return err;
 }
 
 /*
@@ -1432,18 +1447,13 @@ static int nfs_write_mapping(struct address_space *mapping, int how)
 {
        struct writeback_control wbc = {
                .bdi = mapping->backing_dev_info,
-               .sync_mode = WB_SYNC_NONE,
+               .sync_mode = WB_SYNC_ALL,
                .nr_to_write = LONG_MAX,
                .range_start = 0,
                .range_end = LLONG_MAX,
                .for_writepages = 1,
        };
-       int ret;
 
-       ret = __nfs_write_mapping(mapping, &wbc, how);
-       if (ret < 0)
-               return ret;
-       wbc.sync_mode = WB_SYNC_ALL;
        return __nfs_write_mapping(mapping, &wbc, how);
 }