diff options
Diffstat (limited to 'fs/ocfs2/refcounttree.c')
| -rw-r--r-- | fs/ocfs2/refcounttree.c | 73 |
1 files changed, 62 insertions, 11 deletions
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c index 3ac5aa733e9c..b5f9160e93e9 100644 --- a/fs/ocfs2/refcounttree.c +++ b/fs/ocfs2/refcounttree.c @@ -49,6 +49,7 @@ struct ocfs2_cow_context { struct inode *inode; + struct file *file; u32 cow_start; u32 cow_len; struct ocfs2_extent_tree data_et; @@ -2436,16 +2437,26 @@ static int ocfs2_calc_refcount_meta_credits(struct super_block *sb, len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) + le32_to_cpu(rec.r_clusters)) - cpos; /* - * If the refcount rec already exist, cool. We just need - * to check whether there is a split. Otherwise we just need - * to increase the refcount. - * If we will insert one, increases recs_add. - * * We record all the records which will be inserted to the * same refcount block, so that we can tell exactly whether * we need a new refcount block or not. + * + * If we will insert a new one, this is easy and only happens + * during adding refcounted flag to the extent, so we don't + * have a chance of spliting. We just need one record. + * + * If the refcount rec already exists, that would be a little + * complicated. we may have to: + * 1) split at the beginning if the start pos isn't aligned. + * we need 1 more record in this case. + * 2) split int the end if the end pos isn't aligned. + * we need 1 more record in this case. + * 3) split in the middle because of file system fragmentation. + * we need 2 more records in this case(we can't detect this + * beforehand, so always think of the worst case). */ if (rec.r_refcount) { + recs_add += 2; /* Check whether we need a split at the beginning. */ if (cpos == start_cpos && cpos != le64_to_cpu(rec.r_cpos)) @@ -2922,13 +2933,16 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle, u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster); struct page *page; pgoff_t page_index; - unsigned int from, to; + unsigned int from, to, readahead_pages; loff_t offset, end, map_end; struct address_space *mapping = context->inode->i_mapping; mlog(0, "old_cluster %u, new %u, len %u at offset %u\n", old_cluster, new_cluster, new_len, cpos); + readahead_pages = + (ocfs2_cow_contig_clusters(sb) << + OCFS2_SB(sb)->s_clustersize_bits) >> PAGE_CACHE_SHIFT; offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits; end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits); /* @@ -2950,7 +2964,7 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle, if (map_end & (PAGE_CACHE_SIZE - 1)) to = map_end & (PAGE_CACHE_SIZE - 1); - page = grab_cache_page(mapping, page_index); + page = find_or_create_page(mapping, page_index, GFP_NOFS); /* * In case PAGE_CACHE_SIZE <= CLUSTER_SIZE, This page @@ -2959,6 +2973,14 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle, if (PAGE_CACHE_SIZE <= OCFS2_SB(sb)->s_clustersize) BUG_ON(PageDirty(page)); + if (PageReadahead(page) && context->file) { + page_cache_async_readahead(mapping, + &context->file->f_ra, + context->file, + page, page_index, + readahead_pages); + } + if (!PageUptodate(page)) { ret = block_read_full_page(page, ocfs2_get_block); if (ret) { @@ -3169,7 +3191,8 @@ static int ocfs2_cow_sync_writeback(struct super_block *sb, if (map_end > end) map_end = end; - page = grab_cache_page(context->inode->i_mapping, page_index); + page = find_or_create_page(context->inode->i_mapping, + page_index, GFP_NOFS); BUG_ON(!page); wait_on_page_writeback(page); @@ -3398,12 +3421,35 @@ static int ocfs2_replace_cow(struct ocfs2_cow_context *context) return ret; } +static void ocfs2_readahead_for_cow(struct inode *inode, + struct file *file, + u32 start, u32 len) +{ + struct address_space *mapping; + pgoff_t index; + unsigned long num_pages; + int cs_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits; + + if (!file) + return; + + mapping = file->f_mapping; + num_pages = (len << cs_bits) >> PAGE_CACHE_SHIFT; + if (!num_pages) + num_pages = 1; + + index = ((loff_t)start << cs_bits) >> PAGE_CACHE_SHIFT; + page_cache_sync_readahead(mapping, &file->f_ra, file, + index, num_pages); +} + /* * Starting at cpos, try to CoW write_len clusters. Don't CoW * past max_cpos. This will stop when it runs into a hole or an * unrefcounted extent. */ static int ocfs2_refcount_cow_hunk(struct inode *inode, + struct file *file, struct buffer_head *di_bh, u32 cpos, u32 write_len, u32 max_cpos) { @@ -3432,6 +3478,8 @@ static int ocfs2_refcount_cow_hunk(struct inode *inode, BUG_ON(cow_len == 0); + ocfs2_readahead_for_cow(inode, file, cow_start, cow_len); + context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS); if (!context) { ret = -ENOMEM; @@ -3453,6 +3501,7 @@ static int ocfs2_refcount_cow_hunk(struct inode *inode, context->ref_root_bh = ref_root_bh; context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page; context->get_clusters = ocfs2_di_get_clusters; + context->file = file; ocfs2_init_dinode_extent_tree(&context->data_et, INODE_CACHE(inode), di_bh); @@ -3481,6 +3530,7 @@ out: * clusters between cpos and cpos+write_len are safe to modify. */ int ocfs2_refcount_cow(struct inode *inode, + struct file *file, struct buffer_head *di_bh, u32 cpos, u32 write_len, u32 max_cpos) { @@ -3500,7 +3550,7 @@ int ocfs2_refcount_cow(struct inode *inode, num_clusters = write_len; if (ext_flags & OCFS2_EXT_REFCOUNTED) { - ret = ocfs2_refcount_cow_hunk(inode, di_bh, cpos, + ret = ocfs2_refcount_cow_hunk(inode, file, di_bh, cpos, num_clusters, max_cpos); if (ret) { mlog_errno(ret); @@ -4190,8 +4240,9 @@ static int __ocfs2_reflink(struct dentry *old_dentry, goto out; } - mutex_lock(&new_inode->i_mutex); - ret = ocfs2_inode_lock(new_inode, &new_bh, 1); + mutex_lock_nested(&new_inode->i_mutex, I_MUTEX_CHILD); + ret = ocfs2_inode_lock_nested(new_inode, &new_bh, 1, + OI_LS_REFLINK_TARGET); if (ret) { mlog_errno(ret); goto out_unlock; |