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Btrfs: stop using try_to_writeback_inodes_sb_nr to flush delalloc

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try_to_writeback_inodes_sb_nr returns 1 if writeback is already underway, which
is completely fraking useless for us as we need to make sure pages are actually
written before we go and check if there are ordered extents.  So replace this
with an open coding of try_to_writeback_inodes_sb_nr minus the writeback
underway check so that we are sure to actually have flushed some dirty pages out
and will have ordered extents to use.  With this patch xfstests generic/273 now
passes.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2013-06-20 12:31:27 -04:00
parent b150a4f10d
commit 925a6efb8f
1 changed files with 4 additions and 5 deletions
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9
fs/btrfs/extent-tree.c
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@ -3943,12 +3943,11 @@ static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root,
unsigned long nr_pages)
{
struct super_block *sb = root->fs_info->sb;
int started;
/* If we can not start writeback, just sync all the delalloc file. */
started = try_to_writeback_inodes_sb_nr(sb, nr_pages,
WB_REASON_FS_FREE_SPACE);
if (!started) {
if (down_read_trylock(&sb->s_umount)) {
writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE);
up_read(&sb->s_umount);
} else {
/*
* We needn't worry the filesystem going from r/w to r/o though
* we don't acquire ->s_umount mutex, because the filesystem