diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 02b6e7af8edb..873bb99fc2ff 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -2957,6 +2957,210 @@ int ocfs2_truncate_log_init(struct ocfs2_super *osb)
return status;
}
+/*
+ * Delayed de-allocation of suballocator blocks.
+ *
+ * Some sets of block de-allocations might involve multiple suballocator inodes.
+ *
+ * The locking for this can get extremely complicated, especially when
+ * the suballocator inodes to delete from aren't known until deep
+ * within an unrelated codepath.
+ *
+ * ocfs2_extent_block structures are a good example of this - an inode
+ * btree could have been grown by any number of nodes each allocating
+ * out of their own suballoc inode.
+ *
+ * These structures allow the delay of block de-allocation until a
+ * later time, when locking of multiple cluster inodes won't cause
+ * deadlock.
+ */
+
+/*
+ * Describes a single block free from a suballocator
+ */
+struct ocfs2_cached_block_free {
+ struct ocfs2_cached_block_free *free_next;
+ u64 free_blk;
+ unsigned int free_bit;
+};
+
+struct ocfs2_per_slot_free_list {
+ struct ocfs2_per_slot_free_list *f_next_suballocator;
+ int f_inode_type;
+ int f_slot;
+ struct ocfs2_cached_block_free *f_first;
+};
+
+static int ocfs2_free_cached_items(struct ocfs2_super *osb,
+ int sysfile_type,
+ int slot,
+ struct ocfs2_cached_block_free *head)
+{
+ int ret;
+ u64 bg_blkno;
+ handle_t *handle;
+ struct inode *inode;
+ struct buffer_head *di_bh = NULL;
+ struct ocfs2_cached_block_free *tmp;
+
+ inode = ocfs2_get_system_file_inode(osb, sysfile_type, slot);
+ if (!inode) {
+ ret = -EINVAL;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ mutex_lock(&inode->i_mutex);
+
+ ret = ocfs2_meta_lock(inode, &di_bh, 1);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_mutex;
+ }
+
+ handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ mlog_errno(ret);
+ goto out_unlock;
+ }
+
+ while (head) {
+ bg_blkno = ocfs2_which_suballoc_group(head->free_blk,
+ head->free_bit);
+ mlog(0, "Free bit: (bit %u, blkno %llu)\n",
+ head->free_bit, (unsigned long long)head->free_blk);
+
+ ret = ocfs2_free_suballoc_bits(handle, inode, di_bh,
+ head->free_bit, bg_blkno, 1);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_journal;
+ }
+
+ ret = ocfs2_extend_trans(handle, OCFS2_SUBALLOC_FREE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_journal;
+ }
+
+ tmp = head;
+ head = head->free_next;
+ kfree(tmp);
+ }
+
+out_journal:
+ ocfs2_commit_trans(osb, handle);
+
+out_unlock:
+ ocfs2_meta_unlock(inode, 1);
+ brelse(di_bh);
+out_mutex:
+ mutex_unlock(&inode->i_mutex);
+ iput(inode);
+out:
+ while(head) {
+ /* Premature exit may have left some dangling items. */
+ tmp = head;
+ head = head->free_next;
+ kfree(tmp);
+ }
+
+ return ret;
+}
+
+int ocfs2_run_deallocs(struct ocfs2_super *osb,
+ struct ocfs2_cached_dealloc_ctxt *ctxt)
+{
+ int ret = 0, ret2;
+ struct ocfs2_per_slot_free_list *fl;
+
+ if (!ctxt)
+ return 0;
+
+ while (ctxt->c_first_suballocator) {
+ fl = ctxt->c_first_suballocator;
+
+ if (fl->f_first) {
+ mlog(0, "Free items: (type %u, slot %d)\n",
+ fl->f_inode_type, fl->f_slot);
+ ret2 = ocfs2_free_cached_items(osb, fl->f_inode_type,
+ fl->f_slot, fl->f_first);
+ if (ret2)
+ mlog_errno(ret2);
+ if (!ret)
+ ret = ret2;
+ }
+
+ ctxt->c_first_suballocator = fl->f_next_suballocator;
+ kfree(fl);
+ }
+
+ return ret;
+}
+
+static struct ocfs2_per_slot_free_list *
+ocfs2_find_per_slot_free_list(int type,
+ int 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 == slot)
+ return fl;
+
+ fl = fl->f_next_suballocator;
+ }
+
+ fl = kmalloc(sizeof(*fl), GFP_NOFS);
+ if (fl) {
+ fl->f_inode_type = type;
+ fl->f_slot = slot;
+ fl->f_first = NULL;
+ fl->f_next_suballocator = ctxt->c_first_suballocator;
+
+ ctxt->c_first_suballocator = fl;
+ }
+ return fl;
+}
+
+static int ocfs2_cache_block_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
+ int type, int slot, u64 blkno,
+ unsigned int bit)
+{
+ int ret;
+ struct ocfs2_per_slot_free_list *fl;
+ struct ocfs2_cached_block_free *item;
+
+ fl = ocfs2_find_per_slot_free_list(type, slot, ctxt);
+ if (fl == NULL) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ item = kmalloc(sizeof(*item), GFP_NOFS);
+ if (item == NULL) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ mlog(0, "Insert: (type %d, slot %u, bit %u, blk %llu)\n",
+ type, slot, bit, (unsigned long long)blkno);
+
+ item->free_blk = blkno;
+ item->free_bit = bit;
+ item->free_next = fl->f_first;
+
+ fl->f_first = item;
+
+ ret = 0;
+out:
+ return ret;
+}
+
/* 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
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index fbcb5934a081..01db0adc2150 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -63,6 +63,25 @@ int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb,
int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb,
struct ocfs2_dinode *tl_copy);
+/*
+ * Process local structure which describes the block unlinks done
+ * during an operation. This is populated via
+ * ocfs2_cache_block_dealloc().
+ *
+ * ocfs2_run_deallocs() should be called after the potentially
+ * de-allocating routines. No journal handles should be open, and most
+ * locks should have been dropped.
+ */
+struct ocfs2_cached_dealloc_ctxt {
+ struct ocfs2_per_slot_free_list *c_first_suballocator;
+};
+static inline void ocfs2_init_dealloc_ctxt(struct ocfs2_cached_dealloc_ctxt *c)
+{
+ c->c_first_suballocator = NULL;
+}
+int ocfs2_run_deallocs(struct ocfs2_super *osb,
+ struct ocfs2_cached_dealloc_ctxt *ctxt);
+
struct ocfs2_truncate_context {
struct inode *tc_ext_alloc_inode;
struct buffer_head *tc_ext_alloc_bh;
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index e3437626d183..6788f2f1a667 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -98,14 +98,6 @@ static int ocfs2_relink_block_group(handle_t *handle,
u16 chain);
static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
u32 wanted);
-static int ocfs2_free_suballoc_bits(handle_t *handle,
- struct inode *alloc_inode,
- struct buffer_head *alloc_bh,
- unsigned int start_bit,
- u64 bg_blkno,
- unsigned int count);
-static inline u64 ocfs2_which_suballoc_group(u64 block,
- unsigned int bit);
static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
u64 bg_blkno,
u16 bg_bit_off);
@@ -1626,12 +1618,12 @@ bail:
/*
* expects the suballoc inode to already be locked.
*/
-static int ocfs2_free_suballoc_bits(handle_t *handle,
- struct inode *alloc_inode,
- struct buffer_head *alloc_bh,
- unsigned int start_bit,
- u64 bg_blkno,
- unsigned int count)
+int ocfs2_free_suballoc_bits(handle_t *handle,
+ struct inode *alloc_inode,
+ struct buffer_head *alloc_bh,
+ unsigned int start_bit,
+ u64 bg_blkno,
+ unsigned int count)
{
int status = 0;
u32 tmp_used;
@@ -1703,13 +1695,6 @@ bail:
return status;
}
-static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit)
-{
- u64 group = block - (u64) bit;
-
- return group;
-}
-
int ocfs2_free_dinode(handle_t *handle,
struct inode *inode_alloc_inode,
struct buffer_head *inode_alloc_bh,
diff --git a/fs/ocfs2/suballoc.h b/fs/ocfs2/suballoc.h
index 1a3c94cb9250..7bc4819db4db 100644
--- a/fs/ocfs2/suballoc.h
+++ b/fs/ocfs2/suballoc.h
@@ -86,6 +86,12 @@ int ocfs2_claim_clusters(struct ocfs2_super *osb,
u32 *cluster_start,
u32 *num_clusters);
+int ocfs2_free_suballoc_bits(handle_t *handle,
+ struct inode *alloc_inode,
+ struct buffer_head *alloc_bh,
+ unsigned int start_bit,
+ u64 bg_blkno,
+ unsigned int count);
int ocfs2_free_dinode(handle_t *handle,
struct inode *inode_alloc_inode,
struct buffer_head *inode_alloc_bh,
@@ -100,6 +106,13 @@ int ocfs2_free_clusters(handle_t *handle,
u64 start_blk,
unsigned int num_clusters);
+static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit)
+{
+ u64 group = block - (u64) bit;
+
+ return group;
+}
+
static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb,
u64 bg_blkno)
{