X-Git-Url: http://git.cascardo.eti.br/?a=blobdiff_plain;f=fs%2Fbtrfs%2Finode.c;h=355a297e79885bdbafbbd0b9bb0bd4b6bf284c85;hb=70c8a91ce21b83ccd2d9e7c968775430ead4353d;hp=73e6833dcc21e3e76707ac5afa640e372f41ab7f;hpb=d6393786cd40f67709324bc4f08d7e4b911153fe;p=cascardo%2Flinux.git diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 73e6833dcc21..355a297e7988 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -95,6 +95,10 @@ static noinline int cow_file_range(struct inode *inode, struct page *locked_page, u64 start, u64 end, int *page_started, unsigned long *nr_written, int unlock); +static struct extent_map *create_pinned_em(struct inode *inode, u64 start, + u64 len, u64 orig_start, + u64 block_start, u64 block_len, + u64 orig_block_len, int type); static int btrfs_init_inode_security(struct btrfs_trans_handle *trans, struct inode *inode, struct inode *dir, @@ -704,10 +708,14 @@ retry: em->compress_type = async_extent->compress_type; set_bit(EXTENT_FLAG_PINNED, &em->flags); set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); + em->generation = -1; while (1) { write_lock(&em_tree->lock); ret = add_extent_mapping(em_tree, em); + if (!ret) + list_move(&em->list, + &em_tree->modified_extents); write_unlock(&em_tree->lock); if (ret != -EEXIST) { free_extent_map(em); @@ -890,10 +898,14 @@ static noinline int __cow_file_range(struct btrfs_trans_handle *trans, em->orig_block_len = ins.offset; em->bdev = root->fs_info->fs_devices->latest_bdev; set_bit(EXTENT_FLAG_PINNED, &em->flags); + em->generation = -1; while (1) { write_lock(&em_tree->lock); ret = add_extent_mapping(em_tree, em); + if (!ret) + list_move(&em->list, + &em_tree->modified_extents); write_unlock(&em_tree->lock); if (ret != -EEXIST) { free_extent_map(em); @@ -1320,7 +1332,7 @@ out_check: em = alloc_extent_map(); BUG_ON(!em); /* -ENOMEM */ em->start = cur_offset; - em->orig_start = em->start; + em->orig_start = found_key.offset - extent_offset; em->len = num_bytes; em->block_len = num_bytes; em->block_start = disk_bytenr; @@ -1328,9 +1340,13 @@ out_check: em->bdev = root->fs_info->fs_devices->latest_bdev; set_bit(EXTENT_FLAG_PINNED, &em->flags); set_bit(EXTENT_FLAG_FILLING, &em->flags); + em->generation = -1; while (1) { write_lock(&em_tree->lock); ret = add_extent_mapping(em_tree, em); + if (!ret) + list_move(&em->list, + &em_tree->modified_extents); write_unlock(&em_tree->lock); if (ret != -EEXIST) { free_extent_map(em); @@ -5371,6 +5387,7 @@ again: if (start + len <= found_key.offset) goto not_found; em->start = start; + em->orig_start = start; em->len = found_key.offset - start; goto not_found_em; } @@ -5423,7 +5440,7 @@ again: em->len = (copy_size + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); em->orig_block_len = em->len; - em->orig_start = EXTENT_MAP_INLINE; + em->orig_start = em->start; if (compress_type) { set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); em->compress_type = compress_type; @@ -5476,6 +5493,7 @@ again: } not_found: em->start = start; + em->orig_start = start; em->len = len; not_found_em: em->block_start = EXTENT_MAP_HOLE; @@ -5677,30 +5695,14 @@ out: } static struct extent_map *btrfs_new_extent_direct(struct inode *inode, - struct extent_map *em, u64 start, u64 len) { struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_trans_handle *trans; - struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; + struct extent_map *em; struct btrfs_key ins; u64 alloc_hint; int ret; - bool insert = false; - - /* - * Ok if the extent map we looked up is a hole and is for the exact - * range we want, there is no reason to allocate a new one, however if - * it is not right then we need to free this one and drop the cache for - * our range. - */ - if (em->block_start != EXTENT_MAP_HOLE || em->start != start || - em->len != len) { - free_extent_map(em); - em = NULL; - insert = true; - btrfs_drop_extent_cache(inode, start, start + len - 1, 0); - } trans = btrfs_join_transaction(root); if (IS_ERR(trans)) @@ -5716,38 +5718,10 @@ static struct extent_map *btrfs_new_extent_direct(struct inode *inode, goto out; } - if (!em) { - em = alloc_extent_map(); - if (!em) { - em = ERR_PTR(-ENOMEM); - goto out; - } - } - - em->start = start; - em->orig_start = em->start; - em->len = ins.offset; - - em->block_start = ins.objectid; - em->block_len = ins.offset; - em->orig_block_len = ins.offset; - em->bdev = root->fs_info->fs_devices->latest_bdev; - - /* - * We need to do this because if we're using the original em we searched - * for, we could have EXTENT_FLAG_VACANCY set, and we don't want that. - */ - em->flags = 0; - set_bit(EXTENT_FLAG_PINNED, &em->flags); - - while (insert) { - write_lock(&em_tree->lock); - ret = add_extent_mapping(em_tree, em); - write_unlock(&em_tree->lock); - if (ret != -EEXIST) - break; - btrfs_drop_extent_cache(inode, start, start + em->len - 1, 0); - } + em = create_pinned_em(inode, start, ins.offset, start, ins.objectid, + ins.offset, ins.offset, 0); + if (IS_ERR(em)) + goto out; ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid, ins.offset, ins.offset, 0); @@ -5943,6 +5917,7 @@ static struct extent_map *create_pinned_em(struct inode *inode, u64 start, em->block_start = block_start; em->bdev = root->fs_info->fs_devices->latest_bdev; em->orig_block_len = orig_block_len; + em->generation = -1; set_bit(EXTENT_FLAG_PINNED, &em->flags); if (type == BTRFS_ORDERED_PREALLOC) set_bit(EXTENT_FLAG_FILLING, &em->flags); @@ -5952,6 +5927,9 @@ static struct extent_map *create_pinned_em(struct inode *inode, u64 start, em->start + em->len - 1, 0); write_lock(&em_tree->lock); ret = add_extent_mapping(em_tree, em); + if (!ret) + list_move(&em->list, + &em_tree->modified_extents); write_unlock(&em_tree->lock); } while (ret == -EEXIST); @@ -6078,7 +6056,7 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, goto must_cow; if (can_nocow_odirect(trans, inode, start, len) == 1) { - u64 orig_start = em->start; + u64 orig_start = em->orig_start; u64 orig_block_len = em->orig_block_len; if (type == BTRFS_ORDERED_PREALLOC) { @@ -6110,7 +6088,8 @@ must_cow: * it above */ len = bh_result->b_size; - em = btrfs_new_extent_direct(inode, em, start, len); + free_extent_map(em); + em = btrfs_new_extent_direct(inode, start, len); if (IS_ERR(em)) { ret = PTR_ERR(em); goto unlock_err;