ocfs2: Add support of decrementing refcount for delete.
Given a physical cpos and length, decrement the refcount in the tree. If the refcount for any portion of the extent goes to zero, that portion is queued for freeing. Signed-off-by: Tao Ma <tao.ma@oracle.com>wifi-calibration
Tao Ma
Joel Becker
parent
e73a819db9
commit
1823cb0b9f
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@ -6522,9 +6522,9 @@ ocfs2_find_per_slot_free_list(int type,
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return fl;
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}
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static int ocfs2_cache_block_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
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int type, int slot, u64 blkno,
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unsigned int bit)
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int ocfs2_cache_block_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
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int type, int slot, u64 blkno,
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unsigned int bit)
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{
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int ret;
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struct ocfs2_per_slot_free_list *fl;
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@ -202,6 +202,9 @@ static inline void ocfs2_init_dealloc_ctxt(struct ocfs2_cached_dealloc_ctxt *c)
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}
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int ocfs2_cache_cluster_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
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u64 blkno, unsigned int bit);
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int ocfs2_cache_block_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
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int type, int slot, u64 blkno,
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unsigned int bit);
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static inline int ocfs2_dealloc_has_cluster(struct ocfs2_cached_dealloc_ctxt *c)
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{
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return c->c_global_allocator != NULL;
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@ -1071,6 +1071,10 @@ static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb,
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ocfs2_rotate_refcount_rec_left(rb, index);
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}
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/*
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* Change the refcount indexed by "index" in ref_bh.
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* If refcount reaches 0, remove it.
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*/
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static int ocfs2_change_refcount_rec(handle_t *handle,
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struct ocfs2_caching_info *ci,
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struct buffer_head *ref_leaf_bh,
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@ -1079,7 +1083,8 @@ static int ocfs2_change_refcount_rec(handle_t *handle,
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int ret;
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struct ocfs2_refcount_block *rb =
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(struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
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struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index];
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struct ocfs2_refcount_list *rl = &rb->rf_records;
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struct ocfs2_refcount_rec *rec = &rl->rl_recs[index];
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ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
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OCFS2_JOURNAL_ACCESS_WRITE);
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@ -1092,7 +1097,18 @@ static int ocfs2_change_refcount_rec(handle_t *handle,
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le32_to_cpu(rec->r_refcount), change);
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le32_add_cpu(&rec->r_refcount, change);
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ocfs2_refcount_rec_merge(rb, index);
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if (!rec->r_refcount) {
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if (index != le16_to_cpu(rl->rl_used) - 1) {
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memmove(rec, rec + 1,
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(le16_to_cpu(rl->rl_used) - index - 1) *
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sizeof(struct ocfs2_refcount_rec));
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memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1],
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0, sizeof(struct ocfs2_refcount_rec));
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}
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le16_add_cpu(&rl->rl_used, -1);
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} else
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ocfs2_refcount_rec_merge(rb, index);
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ret = ocfs2_journal_dirty(handle, ref_leaf_bh);
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if (ret)
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@ -1901,3 +1917,239 @@ out:
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brelse(ref_leaf_bh);
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return ret;
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}
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static int ocfs2_remove_refcount_extent(handle_t *handle,
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struct ocfs2_caching_info *ci,
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struct buffer_head *ref_root_bh,
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struct buffer_head *ref_leaf_bh,
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struct ocfs2_alloc_context *meta_ac,
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struct ocfs2_cached_dealloc_ctxt *dealloc)
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{
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int ret;
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struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
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struct ocfs2_refcount_block *rb =
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(struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
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struct ocfs2_extent_tree et;
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BUG_ON(rb->rf_records.rl_used);
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ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
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ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos),
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1, meta_ac, dealloc);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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ocfs2_remove_from_cache(ci, ref_leaf_bh);
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/*
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* add the freed block to the dealloc so that it will be freed
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* when we run dealloc.
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*/
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ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE,
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le16_to_cpu(rb->rf_suballoc_slot),
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le64_to_cpu(rb->rf_blkno),
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le16_to_cpu(rb->rf_suballoc_bit));
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
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OCFS2_JOURNAL_ACCESS_WRITE);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
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le32_add_cpu(&rb->rf_clusters, -1);
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/*
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* check whether we need to restore the root refcount block if
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* there is no leaf extent block at atll.
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*/
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if (!rb->rf_list.l_next_free_rec) {
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BUG_ON(rb->rf_clusters);
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mlog(0, "reset refcount tree root %llu to be a record block.\n",
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(unsigned long long)ref_root_bh->b_blocknr);
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rb->rf_flags = 0;
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rb->rf_parent = 0;
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rb->rf_cpos = 0;
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memset(&rb->rf_records, 0, sb->s_blocksize -
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offsetof(struct ocfs2_refcount_block, rf_records));
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rb->rf_records.rl_count =
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cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
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}
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ocfs2_journal_dirty(handle, ref_root_bh);
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out:
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return ret;
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}
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static int ocfs2_decrease_refcount_rec(handle_t *handle,
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struct ocfs2_caching_info *ci,
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struct buffer_head *ref_root_bh,
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struct buffer_head *ref_leaf_bh,
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int index, u64 cpos, unsigned int len,
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struct ocfs2_alloc_context *meta_ac,
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struct ocfs2_cached_dealloc_ctxt *dealloc)
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{
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int ret;
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struct ocfs2_refcount_block *rb =
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(struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
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struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index];
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BUG_ON(cpos < le64_to_cpu(rec->r_cpos));
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BUG_ON(cpos + len >
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le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters));
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if (cpos == le64_to_cpu(rec->r_cpos) &&
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len == le32_to_cpu(rec->r_clusters))
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ret = ocfs2_change_refcount_rec(handle, ci,
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ref_leaf_bh, index, -1);
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else {
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struct ocfs2_refcount_rec split = *rec;
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split.r_cpos = cpu_to_le64(cpos);
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split.r_clusters = cpu_to_le32(len);
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le32_add_cpu(&split.r_refcount, -1);
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mlog(0, "split refcount rec, start %llu, "
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"len %u, count %u, original start %llu, len %u\n",
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(unsigned long long)le64_to_cpu(split.r_cpos),
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len, le32_to_cpu(split.r_refcount),
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(unsigned long long)le64_to_cpu(rec->r_cpos),
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le32_to_cpu(rec->r_clusters));
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ret = ocfs2_split_refcount_rec(handle, ci,
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ref_root_bh, ref_leaf_bh,
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&split, index,
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meta_ac, dealloc);
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}
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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/* Remove the leaf refcount block if it contains no refcount record. */
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if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) {
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ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh,
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ref_leaf_bh, meta_ac,
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dealloc);
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if (ret)
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mlog_errno(ret);
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}
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out:
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return ret;
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}
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static int __ocfs2_decrease_refcount(handle_t *handle,
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struct ocfs2_caching_info *ci,
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struct buffer_head *ref_root_bh,
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u64 cpos, u32 len,
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struct ocfs2_alloc_context *meta_ac,
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struct ocfs2_cached_dealloc_ctxt *dealloc)
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{
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int ret = 0, index = 0;
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struct ocfs2_refcount_rec rec;
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unsigned int r_count = 0, r_len;
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struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
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struct buffer_head *ref_leaf_bh = NULL;
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mlog(0, "Tree owner %llu, decrease refcount start %llu, len %u\n",
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(unsigned long long)ocfs2_metadata_cache_owner(ci),
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(unsigned long long)cpos, len);
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while (len) {
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ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
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cpos, len, &rec, &index,
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&ref_leaf_bh);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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r_count = le32_to_cpu(rec.r_refcount);
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BUG_ON(r_count == 0);
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r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) +
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le32_to_cpu(rec.r_clusters)) - cpos;
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ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh,
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ref_leaf_bh, index,
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cpos, r_len,
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meta_ac, dealloc);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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if (le32_to_cpu(rec.r_refcount) == 1) {
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ret = ocfs2_cache_cluster_dealloc(dealloc,
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ocfs2_clusters_to_blocks(sb, cpos),
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r_len);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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}
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cpos += r_len;
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len -= r_len;
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brelse(ref_leaf_bh);
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ref_leaf_bh = NULL;
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}
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out:
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brelse(ref_leaf_bh);
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return ret;
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}
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/* Caller must hold refcount tree lock. */
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int ocfs2_decrease_refcount(struct inode *inode,
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handle_t *handle, u32 cpos, u32 len,
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struct ocfs2_alloc_context *meta_ac,
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struct ocfs2_cached_dealloc_ctxt *dealloc)
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{
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int ret;
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u64 ref_blkno;
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struct ocfs2_inode_info *oi = OCFS2_I(inode);
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struct buffer_head *ref_root_bh = NULL;
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struct ocfs2_refcount_tree *tree;
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BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
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ret = ocfs2_get_refcount_block(inode, &ref_blkno);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
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&ref_root_bh);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh,
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cpos, len, meta_ac, dealloc);
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if (ret)
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mlog_errno(ret);
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out:
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brelse(ref_root_bh);
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return ret;
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}
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@ -40,4 +40,9 @@ int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
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void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
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struct ocfs2_refcount_tree *tree,
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int rw);
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int ocfs2_decrease_refcount(struct inode *inode,
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handle_t *handle, u32 cpos, u32 len,
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struct ocfs2_alloc_context *meta_ac,
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struct ocfs2_cached_dealloc_ctxt *dealloc);
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#endif /* OCFS2_REFCOUNTTREE_H */
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