struct inode *inode;
struct file *file;
int auto_defrag;
+ int partial;
int credits;
u32 new_phys_cpos;
u32 clusters_moved;
/*
* 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)
+ u32 cpos, u32 phys_cpos, u32 *len, int ext_flags)
{
- int ret, credits = 0, extra_blocks = 0;
+ int ret, credits = 0, extra_blocks = 0, partial = context->partial;
handle_t *handle;
struct inode *inode = context->inode;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
u32 new_phys_cpos, new_len;
u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
- if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) {
+ if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) {
BUG_ON(!(OCFS2_I(inode)->ip_dyn_features &
OCFS2_HAS_REFCOUNT_FL));
ret = ocfs2_prepare_refcount_change_for_del(inode,
context->refcount_loc,
phys_blkno,
- len,
+ *len,
&credits,
&extra_blocks);
if (ret) {
}
}
- ret = ocfs2_lock_allocators_move_extents(inode, &context->et, len, 1,
+ ret = ocfs2_lock_allocators_move_extents(inode, &context->et, *len, 1,
&context->meta_ac,
&context->data_ac,
extra_blocks, &credits);
goto out_unlock_mutex;
}
- ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, len,
+ ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, *len,
&new_phys_cpos, &new_len);
if (ret) {
mlog_errno(ret);
}
/*
- * we're not quite patient here to make multiple attempts for claiming
- * enough clusters, failure to claim clusters per-requested is not a
- * disaster though, it can only mean partial range of defragmentation
- * or extent movements gets gone, users anyway is able to have another
- * try as they wish anytime, since they're going to be returned a
- * '-ENOSPC' and completed length of this movement.
+ * allowing partial extent moving is kind of 'pros and cons', it makes
+ * whole defragmentation less likely to fail, on the contrary, the bad
+ * thing is it may make the fs even more fragmented after moving, let
+ * userspace make a good decision here.
*/
- if (new_len != len) {
- mlog(0, "len_claimed: %u, len: %u\n", new_len, len);
- context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE;
- ret = -ENOSPC;
- goto out_commit;
+ if (new_len != *len) {
+ mlog(0, "len_claimed: %u, len: %u\n", new_len, *len);
+ if (!partial) {
+ context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE;
+ ret = -ENOSPC;
+ goto out_commit;
+ }
}
mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos,
phys_cpos, new_phys_cpos);
- ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos,
+ ret = __ocfs2_move_extent(handle, context, cpos, new_len, phys_cpos,
new_phys_cpos, ext_flags);
if (ret)
mlog_errno(ret);
+ if (partial && (new_len != *len))
+ *len = new_len;
+
/*
* Here we should write the new page out first if we are
* in write-back mode.
*/
- ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len);
+ ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, *len);
if (ret)
mlog_errno(ret);
int *vict_bit,
struct buffer_head **ret_bh)
{
- int ret, i, blocks_per_unit = 1;
+ int ret, i, bits_per_unit = 0;
u64 blkno;
char namebuf[40];
rec = &(cl->cl_recs[0]);
if (type == GLOBAL_BITMAP_SYSTEM_INODE)
- blocks_per_unit <<= (osb->s_clustersize_bits -
- inode->i_sb->s_blocksize_bits);
+ bits_per_unit = osb->s_clustersize_bits -
+ inode->i_sb->s_blocksize_bits;
/*
* 'vict_blkno' was out of the valid range.
*/
if ((vict_blkno < le64_to_cpu(rec->c_blkno)) ||
- (vict_blkno >= (le32_to_cpu(ac_dinode->id1.bitmap1.i_total) *
- blocks_per_unit))) {
+ (vict_blkno >= (le32_to_cpu(ac_dinode->id1.bitmap1.i_total) <<
+ bits_per_unit))) {
ret = -EINVAL;
goto out;
}
le16_to_cpu(bg->bg_bits))) {
*ret_bh = gd_bh;
- *vict_bit = (vict_blkno - blkno) /
- blocks_per_unit;
+ *vict_bit = (vict_blkno - blkno) >>
+ bits_per_unit;
mlog(0, "find the victim group: #%llu, "
"total_bits: %u, vict_bit: %u\n",
blkno, le16_to_cpu(bg->bg_bits),
int ret, goal_bit = 0;
struct buffer_head *gd_bh = NULL;
- struct ocfs2_group_desc *bg;
+ struct ocfs2_group_desc *bg = NULL;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
int c_to_b = 1 << (osb->s_clustersize_bits -
inode->i_sb->s_blocksize_bits);
+ /*
+ * make goal become cluster aligned.
+ */
+ range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb,
+ range->me_goal);
+ /*
+ * moving goal is not allowd to start with a group desc blok(#0 blk)
+ * let's compromise to the latter cluster.
+ */
+ if (range->me_goal == le64_to_cpu(bg->bg_blkno))
+ range->me_goal += c_to_b;
+
/*
* validate goal sits within global_bitmap, and return the victim
* group desc
bg = (struct ocfs2_group_desc *)gd_bh->b_data;
- /*
- * make goal become cluster aligned.
- */
- if (range->me_goal % c_to_b)
- range->me_goal = range->me_goal / c_to_b * c_to_b;
-
- /*
- * moving goal is not allowd to start with a group desc blok(#0 blk)
- * let's compromise to the latter cluster.
- */
- if (range->me_goal == le64_to_cpu(bg->bg_blkno))
- range->me_goal += c_to_b;
-
/*
* movement is not gonna cross two groups.
*/
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);
cpos, phys_cpos, alloc_size, len_defraged);
ret = ocfs2_defrag_extent(context, cpos, phys_cpos,
- alloc_size, flags);
+ &alloc_size, flags);
} else {
ret = ocfs2_move_extent(context, cpos, phys_cpos,
&new_phys_cpos, alloc_size,
len_to_move -= alloc_size;
}
+done:
range->me_flags |= OCFS2_MOVE_EXT_FL_COMPLETE;
out:
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 {
/*
* first best-effort attempt to validate and adjust the goal
projects / mv-sheeva.git / blobdiff