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| author | Tristan Ye <tristan.ye@oracle.com> | 2011-05-25 10:45:41 +0400 |
|---|---|---|
| committer | Tristan Ye <tristan.ye@oracle.com> | 2011-05-25 11:17:13 +0400 |
| commit | dda54e76d7dba0532ebdd72e0b4f492a03f83225 (patch) | |
| tree | 7eae649c453e65bc8b585d9f605bbabe9bdda5e2 | |
| parent | 4dfa66bd595120530506448f3d519f341afd736e (diff) | |
| download | linux-dda54e76d7dba0532ebdd72e0b4f492a03f83225.tar.xz | |
Ocfs2/move_extents: Set several trivial constraints for threshold.
The threshold should be greater than clustersize and less than i_size.
Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
| -rw-r--r-- | fs/ocfs2/move_extents.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/fs/ocfs2/move_extents.c b/fs/ocfs2/move_extents.c index efc509b3af1f..4c5488468c14 100644 --- a/fs/ocfs2/move_extents.c +++ b/fs/ocfs2/move_extents.c @@ -220,6 +220,9 @@ out: /* * Using one journal handle to guarantee the data consistency in case * crash happens anywhere. + * + * XXX: defrag can end up with finishing partial extent as requested, + * due to not enough contiguous clusters can be found in allocator. */ static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context, u32 cpos, u32 phys_cpos, u32 *len, int ext_flags) @@ -876,9 +879,11 @@ static int __ocfs2_move_extents_range(struct buffer_head *di_bh, else len_to_move = 0; - if (do_defrag) + if (do_defrag) { defrag_thresh = range->me_threshold >> osb->s_clustersize_bits; - else + if (defrag_thresh <= 1) + goto done; + } else new_phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, range->me_goal); @@ -950,6 +955,7 @@ next: len_to_move -= alloc_size; } +done: range->me_flags |= OCFS2_MOVE_EXT_FL_COMPLETE; out: @@ -1098,13 +1104,17 @@ int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp) if (range.me_flags & OCFS2_MOVE_EXT_FL_AUTO_DEFRAG) { context->auto_defrag = 1; + /* + * ok, the default theshold for the defragmentation + * is 1M, since our maximum clustersize was 1M also. + * any thought? + */ if (!range.me_threshold) - /* - * ok, the default theshold for the defragmentation - * is 1M, since our maximum clustersize was 1M also. - * any thought? - */ range.me_threshold = 1024 * 1024; + + if (range.me_threshold > i_size_read(inode)) + range.me_threshold = i_size_read(inode); + if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG) context->partial = 1; } else { |