ocfs2: plug truncate into cached dealloc routines

[sfrench/cifs-2.6.git] / fs / ocfs2 / alloc.c

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 873bb99fc2ff4da3c6136a6ef76263515b05d338..26e867087e956ffa7603c287f911b54b6e1481d8 100644 (file)
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -50,6 +50,8 @@
 #include "buffer_head_io.h"
 
 static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc);
+static int ocfs2_cache_extent_block_free(struct ocfs2_cached_dealloc_ctxt *ctxt,
+                                        struct ocfs2_extent_block *eb);
 
 /*
  * Structures which describe a path through a btree, and functions to
@@ -3161,6 +3163,15 @@ out:
        return ret;
 }
 
+static int ocfs2_cache_extent_block_free(struct ocfs2_cached_dealloc_ctxt *ctxt,
+                                        struct ocfs2_extent_block *eb)
+{
+       return ocfs2_cache_block_dealloc(ctxt, EXTENT_ALLOC_SYSTEM_INODE,
+                                        le16_to_cpu(eb->h_suballoc_slot),
+                                        le64_to_cpu(eb->h_blkno),
+                                        le16_to_cpu(eb->h_suballoc_bit));
+}
+
 /* This function will figure out whether the currently last extent
  * block will be deleted, and if it will, what the new last extent
  * block will be so we can update his h_next_leaf_blk field, as well
@@ -3442,27 +3453,10 @@ delete:
                        BUG_ON(le32_to_cpu(el->l_recs[0].e_cpos));
                        BUG_ON(le64_to_cpu(el->l_recs[0].e_blkno));
 
-                       if (le16_to_cpu(eb->h_suballoc_slot) == 0) {
-                               /*
-                                * This code only understands how to
-                                * lock the suballocator in slot 0,
-                                * which is fine because allocation is
-                                * only ever done out of that
-                                * suballocator too. A future version
-                                * might change that however, so avoid
-                                * a free if we don't know how to
-                                * handle it. This way an fs incompat
-                                * bit will not be necessary.
-                                */
-                               ret = ocfs2_free_extent_block(handle,
-                                                             tc->tc_ext_alloc_inode,
-                                                             tc->tc_ext_alloc_bh,
-                                                             eb);
-
-                               /* An error here is not fatal. */
-                               if (ret < 0)
-                                       mlog_errno(ret);
-                       }
+                       ret = ocfs2_cache_extent_block_free(&tc->tc_dealloc, eb);
+                       /* An error here is not fatal. */
+                       if (ret < 0)
+                               mlog_errno(ret);
                } else {
                        deleted_eb = 0;
                }
@@ -3965,6 +3959,8 @@ bail:
        if (handle)
                ocfs2_commit_trans(osb, handle);
 
+       ocfs2_run_deallocs(osb, &tc->tc_dealloc);
+
        ocfs2_free_path(path);
 
        /* This will drop the ext_alloc cluster lock for us */
@@ -3975,23 +3971,18 @@ bail:
 }
 
 /*
- * Expects the inode to already be locked. This will figure out which
- * inodes need to be locked and will put them on the returned truncate
- * context.
+ * Expects the inode to already be locked.
  */
 int ocfs2_prepare_truncate(struct ocfs2_super *osb,
                           struct inode *inode,
                           struct buffer_head *fe_bh,
                           struct ocfs2_truncate_context **tc)
 {
-       int status, metadata_delete, i;
+       int status;
        unsigned int new_i_clusters;
        struct ocfs2_dinode *fe;
        struct ocfs2_extent_block *eb;
-       struct ocfs2_extent_list *el;
        struct buffer_head *last_eb_bh = NULL;
-       struct inode *ext_alloc_inode = NULL;
-       struct buffer_head *ext_alloc_bh = NULL;
 
        mlog_entry_void();
 
@@ -4011,12 +4002,9 @@ int ocfs2_prepare_truncate(struct ocfs2_super *osb,
                mlog_errno(status);
                goto bail;
        }
+       ocfs2_init_dealloc_ctxt(&(*tc)->tc_dealloc);
 
-       metadata_delete = 0;
        if (fe->id2.i_list.l_tree_depth) {
-               /* If we have a tree, then the truncate may result in
-                * metadata deletes. Figure this out from the
-                * rightmost leaf block.*/
                status = ocfs2_read_block(osb, le64_to_cpu(fe->i_last_eb_blk),
                                          &last_eb_bh, OCFS2_BH_CACHED, inode);
                if (status < 0) {
@@ -4031,43 +4019,10 @@ int ocfs2_prepare_truncate(struct ocfs2_super *osb,
                        status = -EIO;
                        goto bail;
                }
-               el = &(eb->h_list);
-
-               i = 0;
-               if (ocfs2_is_empty_extent(&el->l_recs[0]))
-                       i = 1;
-               /*
-                * XXX: Should we check that next_free_rec contains
-                * the extent?
-                */
-               if (le32_to_cpu(el->l_recs[i].e_cpos) >= new_i_clusters)
-                       metadata_delete = 1;
        }
 
        (*tc)->tc_last_eb_bh = last_eb_bh;
 
-       if (metadata_delete) {
-               mlog(0, "Will have to delete metadata for this trunc. "
-                    "locking allocator.\n");
-               ext_alloc_inode = ocfs2_get_system_file_inode(osb, EXTENT_ALLOC_SYSTEM_INODE, 0);
-               if (!ext_alloc_inode) {
-                       status = -ENOMEM;
-                       mlog_errno(status);
-                       goto bail;
-               }
-
-               mutex_lock(&ext_alloc_inode->i_mutex);
-               (*tc)->tc_ext_alloc_inode = ext_alloc_inode;
-
-               status = ocfs2_meta_lock(ext_alloc_inode, &ext_alloc_bh, 1);
-               if (status < 0) {
-                       mlog_errno(status);
-                       goto bail;
-               }
-               (*tc)->tc_ext_alloc_bh = ext_alloc_bh;
-               (*tc)->tc_ext_alloc_locked = 1;
-       }
-
        status = 0;
 bail:
        if (status < 0) {
@@ -4081,16 +4036,13 @@ bail:
 
 static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc)
 {
-       if (tc->tc_ext_alloc_inode) {
-               if (tc->tc_ext_alloc_locked)
-                       ocfs2_meta_unlock(tc->tc_ext_alloc_inode, 1);
-
-               mutex_unlock(&tc->tc_ext_alloc_inode->i_mutex);
-               iput(tc->tc_ext_alloc_inode);
-       }
-
-       if (tc->tc_ext_alloc_bh)
-               brelse(tc->tc_ext_alloc_bh);
+       /*
+        * The caller is responsible for completing deallocation
+        * before freeing the context.
+        */
+       if (tc->tc_dealloc.c_first_suballocator != NULL)
+               mlog(ML_NOTICE,
+                    "Truncate completion has non-empty dealloc context\n");
 
        if (tc->tc_last_eb_bh)
                brelse(tc->tc_last_eb_bh);