diff options
Diffstat (limited to 'fs/btrfs/free-space-cache.c')
-rw-r--r-- | fs/btrfs/free-space-cache.c | 193 |
1 files changed, 76 insertions, 117 deletions
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index bf0d615..41ac927 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -98,6 +98,12 @@ struct inode *lookup_free_space_inode(struct btrfs_root *root, return inode; spin_lock(&block_group->lock); + if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) { + printk(KERN_INFO "Old style space inode found, converting.\n"); + BTRFS_I(inode)->flags &= ~BTRFS_INODE_NODATASUM; + block_group->disk_cache_state = BTRFS_DC_CLEAR; + } + if (!btrfs_fs_closing(root->fs_info)) { block_group->inode = igrab(inode); block_group->iref = 1; @@ -135,7 +141,7 @@ int __create_free_space_inode(struct btrfs_root *root, btrfs_set_inode_gid(leaf, inode_item, 0); btrfs_set_inode_mode(leaf, inode_item, S_IFREG | 0600); btrfs_set_inode_flags(leaf, inode_item, BTRFS_INODE_NOCOMPRESS | - BTRFS_INODE_PREALLOC | BTRFS_INODE_NODATASUM); + BTRFS_INODE_PREALLOC); btrfs_set_inode_nlink(leaf, inode_item, 1); btrfs_set_inode_transid(leaf, inode_item, trans->transid); btrfs_set_inode_block_group(leaf, inode_item, offset); @@ -184,9 +190,11 @@ int btrfs_truncate_free_space_cache(struct btrfs_root *root, struct btrfs_path *path, struct inode *inode) { + struct btrfs_block_rsv *rsv; loff_t oldsize; int ret = 0; + rsv = trans->block_rsv; trans->block_rsv = root->orphan_block_rsv; ret = btrfs_block_rsv_check(trans, root, root->orphan_block_rsv, @@ -204,6 +212,8 @@ int btrfs_truncate_free_space_cache(struct btrfs_root *root, */ ret = btrfs_truncate_inode_items(trans, root, inode, 0, BTRFS_EXTENT_DATA_KEY); + + trans->block_rsv = rsv; if (ret) { WARN_ON(1); return ret; @@ -239,17 +249,12 @@ int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, struct btrfs_free_space_header *header; struct extent_buffer *leaf; struct page *page; - u32 *checksums = NULL, *crc; - char *disk_crcs = NULL; struct btrfs_key key; struct list_head bitmaps; u64 num_entries; u64 num_bitmaps; u64 generation; - u32 cur_crc = ~(u32)0; pgoff_t index = 0; - unsigned long first_page_offset; - int num_checksums; int ret = 0; INIT_LIST_HEAD(&bitmaps); @@ -292,16 +297,6 @@ int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, if (!num_entries) goto out; - /* Setup everything for doing checksumming */ - num_checksums = i_size_read(inode) / PAGE_CACHE_SIZE; - checksums = crc = kzalloc(sizeof(u32) * num_checksums, GFP_NOFS); - if (!checksums) - goto out; - first_page_offset = (sizeof(u32) * num_checksums) + sizeof(u64); - disk_crcs = kzalloc(first_page_offset, GFP_NOFS); - if (!disk_crcs) - goto out; - ret = readahead_cache(inode); if (ret) goto out; @@ -311,18 +306,12 @@ int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, struct btrfs_free_space *e; void *addr; unsigned long offset = 0; - unsigned long start_offset = 0; int need_loop = 0; if (!num_entries && !num_bitmaps) break; - if (index == 0) { - start_offset = first_page_offset; - offset = start_offset; - } - - page = grab_cache_page(inode->i_mapping, index); + page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); if (!page) goto free_cache; @@ -342,8 +331,15 @@ int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, if (index == 0) { u64 *gen; - memcpy(disk_crcs, addr, first_page_offset); - gen = addr + (sizeof(u32) * num_checksums); + /* + * We put a bogus crc in the front of the first page in + * case old kernels try to mount a fs with the new + * format to make sure they discard the cache. + */ + addr += sizeof(u64); + offset += sizeof(u64); + + gen = addr; if (*gen != BTRFS_I(inode)->generation) { printk(KERN_ERR "btrfs: space cache generation" " (%llu) does not match inode (%llu)\n", @@ -355,24 +351,10 @@ int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, page_cache_release(page); goto free_cache; } - crc = (u32 *)disk_crcs; + addr += sizeof(u64); + offset += sizeof(u64); } - entry = addr + start_offset; - - /* First lets check our crc before we do anything fun */ - cur_crc = ~(u32)0; - cur_crc = btrfs_csum_data(root, addr + start_offset, cur_crc, - PAGE_CACHE_SIZE - start_offset); - btrfs_csum_final(cur_crc, (char *)&cur_crc); - if (cur_crc != *crc) { - printk(KERN_ERR "btrfs: crc mismatch for page %lu\n", - index); - kunmap(page); - unlock_page(page); - page_cache_release(page); - goto free_cache; - } - crc++; + entry = addr; while (1) { if (!num_entries) @@ -470,8 +452,6 @@ next: ret = 1; out: - kfree(checksums); - kfree(disk_crcs); return ret; free_cache: __btrfs_remove_free_space_cache(ctl); @@ -569,8 +549,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, struct btrfs_key key; u64 start, end, len; u64 bytes = 0; - u32 *crc, *checksums; - unsigned long first_page_offset; + u32 crc = ~(u32)0; int index = 0, num_pages = 0; int entries = 0; int bitmaps = 0; @@ -590,34 +569,13 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, num_pages = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; - /* Since the first page has all of our checksums and our generation we - * need to calculate the offset into the page that we can start writing - * our entries. - */ - first_page_offset = (sizeof(u32) * num_pages) + sizeof(u64); - filemap_write_and_wait(inode->i_mapping); btrfs_wait_ordered_range(inode, inode->i_size & ~(root->sectorsize - 1), (u64)-1); - /* make sure we don't overflow that first page */ - if (first_page_offset + sizeof(struct btrfs_free_space_entry) >= PAGE_CACHE_SIZE) { - /* this is really the same as running out of space, where we also return 0 */ - printk(KERN_CRIT "Btrfs: free space cache was too big for the crc page\n"); - ret = 0; - goto out_update; - } - - /* We need a checksum per page. */ - crc = checksums = kzalloc(sizeof(u32) * num_pages, GFP_NOFS); - if (!crc) - return -1; - pages = kzalloc(sizeof(struct page *) * num_pages, GFP_NOFS); - if (!pages) { - kfree(crc); + if (!pages) return -1; - } /* Get the cluster for this block_group if it exists */ if (block_group && !list_empty(&block_group->cluster_list)) @@ -640,7 +598,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, * know and don't freak out. */ while (index < num_pages) { - page = grab_cache_page(inode->i_mapping, index); + page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); if (!page) { int i; @@ -648,7 +606,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, unlock_page(pages[i]); page_cache_release(pages[i]); } - goto out_free; + goto out; } pages[index] = page; index++; @@ -668,17 +626,11 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, /* Write out the extent entries */ do { struct btrfs_free_space_entry *entry; - void *addr; + void *addr, *orig; unsigned long offset = 0; - unsigned long start_offset = 0; next_page = false; - if (index == 0) { - start_offset = first_page_offset; - offset = start_offset; - } - if (index >= num_pages) { out_of_space = true; break; @@ -686,10 +638,26 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, page = pages[index]; - addr = kmap(page); - entry = addr + start_offset; + orig = addr = kmap(page); + if (index == 0) { + u64 *gen; - memset(addr, 0, PAGE_CACHE_SIZE); + /* + * We're going to put in a bogus crc for this page to + * make sure that old kernels who aren't aware of this + * format will be sure to discard the cache. + */ + addr += sizeof(u64); + offset += sizeof(u64); + + gen = addr; + *gen = trans->transid; + addr += sizeof(u64); + offset += sizeof(u64); + } + entry = addr; + + memset(addr, 0, PAGE_CACHE_SIZE - offset); while (node && !next_page) { struct btrfs_free_space *e; @@ -752,13 +720,19 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, next_page = true; entry++; } - *crc = ~(u32)0; - *crc = btrfs_csum_data(root, addr + start_offset, *crc, - PAGE_CACHE_SIZE - start_offset); - kunmap(page); - btrfs_csum_final(*crc, (char *)crc); - crc++; + /* Generate bogus crc value */ + if (index == 0) { + u32 *tmp; + crc = btrfs_csum_data(root, orig + sizeof(u64), crc, + PAGE_CACHE_SIZE - sizeof(u64)); + btrfs_csum_final(crc, (char *)&crc); + crc++; + tmp = orig; + *tmp = crc; + } + + kunmap(page); bytes += PAGE_CACHE_SIZE; @@ -779,11 +753,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, addr = kmap(page); memcpy(addr, entry->bitmap, PAGE_CACHE_SIZE); - *crc = ~(u32)0; - *crc = btrfs_csum_data(root, addr, *crc, PAGE_CACHE_SIZE); kunmap(page); - btrfs_csum_final(*crc, (char *)crc); - crc++; bytes += PAGE_CACHE_SIZE; list_del_init(&entry->list); @@ -796,7 +766,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, i_size_read(inode) - 1, &cached_state, GFP_NOFS); ret = 0; - goto out_free; + goto out; } /* Zero out the rest of the pages just to make sure */ @@ -811,20 +781,6 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, index++; } - /* Write the checksums and trans id to the first page */ - { - void *addr; - u64 *gen; - - page = pages[0]; - - addr = kmap(page); - memcpy(addr, checksums, sizeof(u32) * num_pages); - gen = addr + (sizeof(u32) * num_pages); - *gen = trans->transid; - kunmap(page); - } - ret = btrfs_dirty_pages(root, inode, pages, num_pages, 0, bytes, &cached_state); btrfs_drop_pages(pages, num_pages); @@ -833,7 +789,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, if (ret) { ret = 0; - goto out_free; + goto out; } BTRFS_I(inode)->generation = trans->transid; @@ -850,7 +806,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, bytes - 1, EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS); - goto out_free; + goto out; } leaf = path->nodes[0]; if (ret > 0) { @@ -866,7 +822,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS); btrfs_release_path(path); - goto out_free; + goto out; } } header = btrfs_item_ptr(leaf, path->slots[0], @@ -879,11 +835,8 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, ret = 1; -out_free: - kfree(checksums); +out: kfree(pages); - -out_update: if (ret != 1) { invalidate_inode_pages2_range(inode->i_mapping, 0, index); BTRFS_I(inode)->generation = 0; @@ -1219,9 +1172,9 @@ static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl) div64_u64(extent_bytes, (sizeof(struct btrfs_free_space))); } -static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, - struct btrfs_free_space *info, u64 offset, - u64 bytes) +static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, + struct btrfs_free_space *info, + u64 offset, u64 bytes) { unsigned long start, count; @@ -1232,6 +1185,13 @@ static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, bitmap_clear(info->bitmap, start, count); info->bytes -= bytes; +} + +static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, + struct btrfs_free_space *info, u64 offset, + u64 bytes) +{ + __bitmap_clear_bits(ctl, info, offset, bytes); ctl->free_space -= bytes; } @@ -2035,7 +1995,7 @@ static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group, return 0; ret = search_start; - bitmap_clear_bits(ctl, entry, ret, bytes); + __bitmap_clear_bits(ctl, entry, ret, bytes); return ret; } @@ -2090,7 +2050,6 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, continue; } } else { - ret = entry->offset; entry->offset += bytes; |