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-rw-r--r--fs/ocfs2/alloc.c206
-rw-r--r--fs/ocfs2/alloc.h1
-rw-r--r--fs/ocfs2/aops.c6
3 files changed, 203 insertions, 10 deletions
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 134f3b5c25b0..b3321de88d2b 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -165,6 +165,13 @@ static int ocfs2_dinode_insert_check(struct ocfs2_extent_tree *et,
struct ocfs2_extent_rec *rec);
static int ocfs2_dinode_sanity_check(struct ocfs2_extent_tree *et);
static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et);
+
+static int ocfs2_reuse_blk_from_dealloc(handle_t *handle,
+ struct ocfs2_extent_tree *et,
+ struct buffer_head **new_eb_bh,
+ int blk_wanted, int *blk_given);
+static int ocfs2_is_dealloc_empty(struct ocfs2_extent_tree *et);
+
static const struct ocfs2_extent_tree_operations ocfs2_dinode_et_ops = {
.eo_set_last_eb_blk = ocfs2_dinode_set_last_eb_blk,
.eo_get_last_eb_blk = ocfs2_dinode_get_last_eb_blk,
@@ -448,6 +455,7 @@ static void __ocfs2_init_extent_tree(struct ocfs2_extent_tree *et,
if (!obj)
obj = (void *)bh->b_data;
et->et_object = obj;
+ et->et_dealloc = NULL;
et->et_ops->eo_fill_root_el(et);
if (!et->et_ops->eo_fill_max_leaf_clusters)
@@ -1158,7 +1166,7 @@ static int ocfs2_add_branch(handle_t *handle,
struct buffer_head **last_eb_bh,
struct ocfs2_alloc_context *meta_ac)
{
- int status, new_blocks, i;
+ int status, new_blocks, i, block_given = 0;
u64 next_blkno, new_last_eb_blk;
struct buffer_head *bh;
struct buffer_head **new_eb_bhs = NULL;
@@ -1213,11 +1221,31 @@ static int ocfs2_add_branch(handle_t *handle,
goto bail;
}
- status = ocfs2_create_new_meta_bhs(handle, et, new_blocks,
- meta_ac, new_eb_bhs);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
+ /* Firstyly, try to reuse dealloc since we have already estimated how
+ * many extent blocks we may use.
+ */
+ if (!ocfs2_is_dealloc_empty(et)) {
+ status = ocfs2_reuse_blk_from_dealloc(handle, et,
+ new_eb_bhs, new_blocks,
+ &block_given);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ BUG_ON(block_given > new_blocks);
+
+ if (block_given < new_blocks) {
+ BUG_ON(!meta_ac);
+ status = ocfs2_create_new_meta_bhs(handle, et,
+ new_blocks - block_given,
+ meta_ac,
+ &new_eb_bhs[block_given]);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
}
/* Note: new_eb_bhs[new_blocks - 1] is the guy which will be
@@ -1340,15 +1368,25 @@ static int ocfs2_shift_tree_depth(handle_t *handle,
struct ocfs2_alloc_context *meta_ac,
struct buffer_head **ret_new_eb_bh)
{
- int status, i;
+ int status, i, block_given = 0;
u32 new_clusters;
struct buffer_head *new_eb_bh = NULL;
struct ocfs2_extent_block *eb;
struct ocfs2_extent_list *root_el;
struct ocfs2_extent_list *eb_el;
- status = ocfs2_create_new_meta_bhs(handle, et, 1, meta_ac,
- &new_eb_bh);
+ if (!ocfs2_is_dealloc_empty(et)) {
+ status = ocfs2_reuse_blk_from_dealloc(handle, et,
+ &new_eb_bh, 1,
+ &block_given);
+ } else if (meta_ac) {
+ status = ocfs2_create_new_meta_bhs(handle, et, 1, meta_ac,
+ &new_eb_bh);
+
+ } else {
+ BUG();
+ }
+
if (status < 0) {
mlog_errno(status);
goto bail;
@@ -1511,7 +1549,7 @@ static int ocfs2_grow_tree(handle_t *handle, struct ocfs2_extent_tree *et,
int depth = le16_to_cpu(el->l_tree_depth);
struct buffer_head *bh = NULL;
- BUG_ON(meta_ac == NULL);
+ BUG_ON(meta_ac == NULL && ocfs2_is_dealloc_empty(et));
shift = ocfs2_find_branch_target(et, &bh);
if (shift < 0) {
@@ -6578,6 +6616,154 @@ ocfs2_find_per_slot_free_list(int type,
return fl;
}
+static struct ocfs2_per_slot_free_list *
+ocfs2_find_preferred_free_list(int type,
+ int preferred_slot,
+ int *real_slot,
+ struct ocfs2_cached_dealloc_ctxt *ctxt)
+{
+ struct ocfs2_per_slot_free_list *fl = ctxt->c_first_suballocator;
+
+ while (fl) {
+ if (fl->f_inode_type == type && fl->f_slot == preferred_slot) {
+ *real_slot = fl->f_slot;
+ return fl;
+ }
+
+ fl = fl->f_next_suballocator;
+ }
+
+ /* If we can't find any free list matching preferred slot, just use
+ * the first one.
+ */
+ fl = ctxt->c_first_suballocator;
+ *real_slot = fl->f_slot;
+
+ return fl;
+}
+
+/* Return Value 1 indicates empty */
+static int ocfs2_is_dealloc_empty(struct ocfs2_extent_tree *et)
+{
+ struct ocfs2_per_slot_free_list *fl = NULL;
+
+ if (!et->et_dealloc)
+ return 1;
+
+ fl = et->et_dealloc->c_first_suballocator;
+ if (!fl)
+ return 1;
+
+ if (!fl->f_first)
+ return 1;
+
+ return 0;
+}
+
+/* If extent was deleted from tree due to extent rotation and merging, and
+ * no metadata is reserved ahead of time. Try to reuse some extents
+ * just deleted. This is only used to reuse extent blocks.
+ * It is supposed to find enough extent blocks in dealloc if our estimation
+ * on metadata is accurate.
+ */
+static int ocfs2_reuse_blk_from_dealloc(handle_t *handle,
+ struct ocfs2_extent_tree *et,
+ struct buffer_head **new_eb_bh,
+ int blk_wanted, int *blk_given)
+{
+ int i, status = 0, real_slot;
+ struct ocfs2_cached_dealloc_ctxt *dealloc;
+ struct ocfs2_per_slot_free_list *fl;
+ struct ocfs2_cached_block_free *bf;
+ struct ocfs2_extent_block *eb;
+ struct ocfs2_super *osb =
+ OCFS2_SB(ocfs2_metadata_cache_get_super(et->et_ci));
+
+ *blk_given = 0;
+
+ /* If extent tree doesn't have a dealloc, this is not faulty. Just
+ * tell upper caller dealloc can't provide any block and it should
+ * ask for alloc to claim more space.
+ */
+ dealloc = et->et_dealloc;
+ if (!dealloc)
+ goto bail;
+
+ for (i = 0; i < blk_wanted; i++) {
+ /* Prefer to use local slot */
+ fl = ocfs2_find_preferred_free_list(EXTENT_ALLOC_SYSTEM_INODE,
+ osb->slot_num, &real_slot,
+ dealloc);
+ /* If no more block can be reused, we should claim more
+ * from alloc. Just return here normally.
+ */
+ if (!fl) {
+ status = 0;
+ break;
+ }
+
+ bf = fl->f_first;
+ fl->f_first = bf->free_next;
+
+ new_eb_bh[i] = sb_getblk(osb->sb, bf->free_blk);
+ if (new_eb_bh[i] == NULL) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ mlog(0, "Reusing block(%llu) from "
+ "dealloc(local slot:%d, real slot:%d)\n",
+ bf->free_blk, osb->slot_num, real_slot);
+
+ ocfs2_set_new_buffer_uptodate(et->et_ci, new_eb_bh[i]);
+
+ status = ocfs2_journal_access_eb(handle, et->et_ci,
+ new_eb_bh[i],
+ OCFS2_JOURNAL_ACCESS_CREATE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ memset(new_eb_bh[i]->b_data, 0, osb->sb->s_blocksize);
+ eb = (struct ocfs2_extent_block *) new_eb_bh[i]->b_data;
+
+ /* We can't guarantee that buffer head is still cached, so
+ * polutlate the extent block again.
+ */
+ strcpy(eb->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE);
+ eb->h_blkno = cpu_to_le64(bf->free_blk);
+ eb->h_fs_generation = cpu_to_le32(osb->fs_generation);
+ eb->h_suballoc_slot = cpu_to_le16(real_slot);
+ eb->h_suballoc_loc = cpu_to_le64(bf->free_bg);
+ eb->h_suballoc_bit = cpu_to_le16(bf->free_bit);
+ eb->h_list.l_count =
+ cpu_to_le16(ocfs2_extent_recs_per_eb(osb->sb));
+
+ /* We'll also be dirtied by the caller, so
+ * this isn't absolutely necessary.
+ */
+ ocfs2_journal_dirty(handle, new_eb_bh[i]);
+
+ if (!fl->f_first) {
+ dealloc->c_first_suballocator = fl->f_next_suballocator;
+ kfree(fl);
+ }
+ kfree(bf);
+ }
+
+ *blk_given = i;
+
+bail:
+ if (unlikely(status < 0)) {
+ for (i = 0; i < blk_wanted; i++)
+ brelse(new_eb_bh[i]);
+ }
+
+ return status;
+}
+
int ocfs2_cache_block_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
int type, int slot, u64 suballoc,
u64 blkno, unsigned int bit)
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index 27b75cf32cfa..250bcacdf9e9 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -61,6 +61,7 @@ struct ocfs2_extent_tree {
ocfs2_journal_access_func et_root_journal_access;
void *et_object;
unsigned int et_max_leaf_clusters;
+ struct ocfs2_cached_dealloc_ctxt *et_dealloc;
};
/*
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 256986aca8df..e8e205bf2e41 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -2332,6 +2332,12 @@ static int ocfs2_dio_end_io_write(struct inode *inode,
ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
+ /* Attach dealloc with extent tree in case that we may reuse extents
+ * which are already unlinked from current extent tree due to extent
+ * rotation and merging.
+ */
+ et.et_dealloc = &dealloc;
+
ret = ocfs2_lock_allocators(inode, &et, 0, dwc->dw_zero_count*2,
&data_ac, &meta_ac);
if (ret) {
generated by cgit (git 2.34.1) at 2024-06-11 07:17:07 +0000