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author | Tristan Ye <tristan.ye@oracle.com> | 2011-03-18 07:35:32 +0100 |
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committer | Tristan Ye <tristan.ye@oracle.com> | 2011-05-25 09:17:09 +0200 |
commit | de474ee8bbc315b0e6772cebdb24b335f82cf95d (patch) | |
tree | 04426cf07865f7f456eb2f8154d96b2ef403cee9 /fs/ocfs2/move_extents.c | |
parent | Ocfs2/move_extents: Add basic framework and source files for extent moving. (diff) | |
download | linux-de474ee8bbc315b0e6772cebdb24b335f82cf95d.tar.xz linux-de474ee8bbc315b0e6772cebdb24b335f82cf95d.zip |
Ocfs2/move_extents: lock allocators and reserve metadata blocks and data clusters for extents moving.
ocfs2_lock_allocators_move_extents() was like the common ocfs2_lock_allocators(),
to lock metadata and data alloctors during extents moving, reserve appropriate
metadata blocks and data clusters, also performa a best- effort to calculate the
credits for journal transaction in one run of movement.
Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
Diffstat (limited to 'fs/ocfs2/move_extents.c')
-rw-r--r-- | fs/ocfs2/move_extents.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/fs/ocfs2/move_extents.c b/fs/ocfs2/move_extents.c index 6311c15356f7..e5ce1495dc77 100644 --- a/fs/ocfs2/move_extents.c +++ b/fs/ocfs2/move_extents.c @@ -54,3 +54,64 @@ struct ocfs2_move_extents_context { struct ocfs2_alloc_context *data_ac; struct ocfs2_cached_dealloc_ctxt dealloc; }; + +/* + * lock allocators, and reserving appropriate number of bits for + * meta blocks and data clusters. + * + * in some cases, we don't need to reserve clusters, just let data_ac + * be NULL. + */ +static int ocfs2_lock_allocators_move_extents(struct inode *inode, + struct ocfs2_extent_tree *et, + u32 clusters_to_move, + u32 extents_to_split, + struct ocfs2_alloc_context **meta_ac, + struct ocfs2_alloc_context **data_ac, + int extra_blocks, + int *credits) +{ + int ret, num_free_extents; + unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + num_free_extents = ocfs2_num_free_extents(osb, et); + if (num_free_extents < 0) { + ret = num_free_extents; + mlog_errno(ret); + goto out; + } + + if (!num_free_extents || + (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) + extra_blocks += ocfs2_extend_meta_needed(et->et_root_el); + + ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac); + if (ret) { + mlog_errno(ret); + goto out; + } + + if (data_ac) { + ret = ocfs2_reserve_clusters(osb, clusters_to_move, data_ac); + if (ret) { + mlog_errno(ret); + goto out; + } + } + + *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el, + clusters_to_move + 2); + + mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n", + extra_blocks, clusters_to_move, *credits); +out: + if (ret) { + if (*meta_ac) { + ocfs2_free_alloc_context(*meta_ac); + *meta_ac = NULL; + } + } + + return ret; +} |