16cbd5570SChris Mason /* 26cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 36cbd5570SChris Mason * 46cbd5570SChris Mason * This program is free software; you can redistribute it and/or 56cbd5570SChris Mason * modify it under the terms of the GNU General Public 66cbd5570SChris Mason * License v2 as published by the Free Software Foundation. 76cbd5570SChris Mason * 86cbd5570SChris Mason * This program is distributed in the hope that it will be useful, 96cbd5570SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 106cbd5570SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 116cbd5570SChris Mason * General Public License for more details. 126cbd5570SChris Mason * 136cbd5570SChris Mason * You should have received a copy of the GNU General Public 146cbd5570SChris Mason * License along with this program; if not, write to the 156cbd5570SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 166cbd5570SChris Mason * Boston, MA 021110-1307, USA. 176cbd5570SChris Mason */ 186cbd5570SChris Mason 19e20d96d6SChris Mason #include <linux/fs.h> 20d98237b3SChris Mason #include <linux/blkdev.h> 2111bd143fSChris Mason #include <linux/crc32c.h> 2287cbda5cSChris Mason #include <linux/scatterlist.h> 2322b0ebdaSChris Mason #include <linux/swap.h> 240f7d52f4SChris Mason #include <linux/radix-tree.h> 2535b7e476SChris Mason #include <linux/writeback.h> 265f39d397SChris Mason #include <linux/buffer_head.h> // for block_sync_page 27eb60ceacSChris Mason #include "ctree.h" 28eb60ceacSChris Mason #include "disk-io.h" 29e089f05cSChris Mason #include "transaction.h" 300f7d52f4SChris Mason #include "btrfs_inode.h" 31eb60ceacSChris Mason 325f39d397SChris Mason #if 0 335f39d397SChris Mason static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf) 347eccb903SChris Mason { 355f39d397SChris Mason if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) { 365f39d397SChris Mason printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n", 375f39d397SChris Mason (unsigned long long)extent_buffer_blocknr(buf), 385f39d397SChris Mason (unsigned long long)btrfs_header_blocknr(buf)); 3939279cc3SChris Mason return 1; 40d98237b3SChris Mason } 419a8dd150SChris Mason return 0; 42eb60ceacSChris Mason } 435f39d397SChris Mason #endif 44eb60ceacSChris Mason 455f39d397SChris Mason struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, 46d98237b3SChris Mason u64 blocknr) 47eb60ceacSChris Mason { 485f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 495f39d397SChris Mason return find_extent_buffer(&BTRFS_I(btree_inode)->extent_tree, 505f39d397SChris Mason blocknr * root->sectorsize, 515f39d397SChris Mason root->sectorsize, GFP_NOFS); 52e20d96d6SChris Mason } 535f39d397SChris Mason 545f39d397SChris Mason struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, 555f39d397SChris Mason u64 blocknr) 565f39d397SChris Mason { 575f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 585f39d397SChris Mason return alloc_extent_buffer(&BTRFS_I(btree_inode)->extent_tree, 595f39d397SChris Mason blocknr * root->sectorsize, 605f39d397SChris Mason root->sectorsize, GFP_NOFS); 61d98237b3SChris Mason } 625f39d397SChris Mason 635f39d397SChris Mason struct extent_map *btree_get_extent(struct inode *inode, struct page *page, 645f39d397SChris Mason size_t page_offset, u64 start, u64 end, 655f39d397SChris Mason int create) 665f39d397SChris Mason { 675f39d397SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 685f39d397SChris Mason struct extent_map *em; 695f39d397SChris Mason int ret; 705f39d397SChris Mason 715f39d397SChris Mason again: 725f39d397SChris Mason em = lookup_extent_mapping(em_tree, start, end); 735f39d397SChris Mason if (em) { 745f39d397SChris Mason goto out; 755f39d397SChris Mason } 765f39d397SChris Mason em = alloc_extent_map(GFP_NOFS); 775f39d397SChris Mason if (!em) { 785f39d397SChris Mason em = ERR_PTR(-ENOMEM); 795f39d397SChris Mason goto out; 805f39d397SChris Mason } 815f39d397SChris Mason em->start = 0; 825f39d397SChris Mason em->end = (i_size_read(inode) & ~((u64)PAGE_CACHE_SIZE -1)) - 1; 835f39d397SChris Mason em->block_start = 0; 845f39d397SChris Mason em->block_end = em->end; 855f39d397SChris Mason em->bdev = inode->i_sb->s_bdev; 865f39d397SChris Mason ret = add_extent_mapping(em_tree, em); 875f39d397SChris Mason if (ret == -EEXIST) { 885f39d397SChris Mason free_extent_map(em); 895f39d397SChris Mason em = NULL; 905f39d397SChris Mason goto again; 915f39d397SChris Mason } else if (ret) { 925f39d397SChris Mason em = ERR_PTR(ret); 935f39d397SChris Mason } 945f39d397SChris Mason out: 955f39d397SChris Mason return em; 965f39d397SChris Mason } 975f39d397SChris Mason 985f39d397SChris Mason static int btree_writepage(struct page *page, struct writeback_control *wbc) 995f39d397SChris Mason { 1005f39d397SChris Mason struct extent_map_tree *tree; 1015f39d397SChris Mason tree = &BTRFS_I(page->mapping->host)->extent_tree; 1025f39d397SChris Mason return extent_write_full_page(tree, page, btree_get_extent, wbc); 1035f39d397SChris Mason } 1045f39d397SChris Mason int btree_readpage(struct file *file, struct page *page) 1055f39d397SChris Mason { 1065f39d397SChris Mason struct extent_map_tree *tree; 1075f39d397SChris Mason tree = &BTRFS_I(page->mapping->host)->extent_tree; 1085f39d397SChris Mason return extent_read_full_page(tree, page, btree_get_extent); 1095f39d397SChris Mason } 1105f39d397SChris Mason 1115f39d397SChris Mason static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags) 1125f39d397SChris Mason { 1135f39d397SChris Mason struct extent_map_tree *tree; 1145f39d397SChris Mason int ret; 1155f39d397SChris Mason 1165f39d397SChris Mason BUG_ON(page->private != 1); 1175f39d397SChris Mason tree = &BTRFS_I(page->mapping->host)->extent_tree; 1185f39d397SChris Mason ret = try_release_extent_mapping(tree, page); 1195f39d397SChris Mason if (ret == 1) { 1205f39d397SChris Mason ClearPagePrivate(page); 1215f39d397SChris Mason set_page_private(page, 0); 122d98237b3SChris Mason page_cache_release(page); 1235f39d397SChris Mason } 124d98237b3SChris Mason return ret; 125d98237b3SChris Mason } 126d98237b3SChris Mason 1275f39d397SChris Mason static void btree_invalidatepage(struct page *page, unsigned long offset) 128d98237b3SChris Mason { 1295f39d397SChris Mason struct extent_map_tree *tree; 1305f39d397SChris Mason tree = &BTRFS_I(page->mapping->host)->extent_tree; 1315f39d397SChris Mason extent_invalidatepage(tree, page, offset); 1325f39d397SChris Mason btree_releasepage(page, GFP_NOFS); 133d98237b3SChris Mason } 134d98237b3SChris Mason 135f254e52cSChris Mason int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len, 136f254e52cSChris Mason char *result) 13787cbda5cSChris Mason { 1385f39d397SChris Mason return 0; 1395f39d397SChris Mason #if 0 14011bd143fSChris Mason u32 crc; 14111bd143fSChris Mason crc = crc32c(0, data, len); 14211bd143fSChris Mason memcpy(result, &crc, BTRFS_CRC32_SIZE); 14311bd143fSChris Mason return 0; 1445f39d397SChris Mason #endif 14511bd143fSChris Mason } 14687cbda5cSChris Mason 1475f39d397SChris Mason #if 0 1485f39d397SChris Mason static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, 149f254e52cSChris Mason int verify) 150f254e52cSChris Mason { 1515f39d397SChris Mason return 0; 152509659cdSChris Mason char result[BTRFS_CRC32_SIZE]; 153f254e52cSChris Mason int ret; 154f254e52cSChris Mason struct btrfs_node *node; 155f254e52cSChris Mason 156f254e52cSChris Mason ret = btrfs_csum_data(root, bh->b_data + BTRFS_CSUM_SIZE, 157f254e52cSChris Mason bh->b_size - BTRFS_CSUM_SIZE, result); 158f254e52cSChris Mason if (ret) 159f254e52cSChris Mason return ret; 16087cbda5cSChris Mason if (verify) { 161509659cdSChris Mason if (memcmp(bh->b_data, result, BTRFS_CRC32_SIZE)) { 1625af3981cSChris Mason printk("btrfs: %s checksum verify failed on %llu\n", 1635af3981cSChris Mason root->fs_info->sb->s_id, 1645af3981cSChris Mason (unsigned long long)bh_blocknr(bh)); 165f254e52cSChris Mason return 1; 166f254e52cSChris Mason } 167f254e52cSChris Mason } else { 168f254e52cSChris Mason node = btrfs_buffer_node(bh); 169509659cdSChris Mason memcpy(node->header.csum, result, BTRFS_CRC32_SIZE); 170f254e52cSChris Mason } 17187cbda5cSChris Mason return 0; 17287cbda5cSChris Mason } 1735f39d397SChris Mason #endif 17487cbda5cSChris Mason 1755f39d397SChris Mason #if 0 176d98237b3SChris Mason static int btree_writepage(struct page *page, struct writeback_control *wbc) 177d98237b3SChris Mason { 17887cbda5cSChris Mason struct buffer_head *bh; 1790f7d52f4SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 18087cbda5cSChris Mason struct buffer_head *head; 18187cbda5cSChris Mason if (!page_has_buffers(page)) { 18287cbda5cSChris Mason create_empty_buffers(page, root->fs_info->sb->s_blocksize, 18387cbda5cSChris Mason (1 << BH_Dirty)|(1 << BH_Uptodate)); 18487cbda5cSChris Mason } 18587cbda5cSChris Mason head = page_buffers(page); 18687cbda5cSChris Mason bh = head; 18787cbda5cSChris Mason do { 18887cbda5cSChris Mason if (buffer_dirty(bh)) 18987cbda5cSChris Mason csum_tree_block(root, bh, 0); 19087cbda5cSChris Mason bh = bh->b_this_page; 19187cbda5cSChris Mason } while (bh != head); 192d98237b3SChris Mason return block_write_full_page(page, btree_get_block, wbc); 193d98237b3SChris Mason } 1945f39d397SChris Mason #endif 195d98237b3SChris Mason 196d98237b3SChris Mason static struct address_space_operations btree_aops = { 197d98237b3SChris Mason .readpage = btree_readpage, 198d98237b3SChris Mason .writepage = btree_writepage, 1995f39d397SChris Mason .releasepage = btree_releasepage, 2005f39d397SChris Mason .invalidatepage = btree_invalidatepage, 201d98237b3SChris Mason .sync_page = block_sync_page, 202d98237b3SChris Mason }; 203123abc88SChris Mason 204090d1875SChris Mason int readahead_tree_block(struct btrfs_root *root, u64 blocknr) 205090d1875SChris Mason { 2065f39d397SChris Mason struct extent_buffer *buf = NULL; 2075f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 208de428b63SChris Mason int ret = 0; 209090d1875SChris Mason 2105f39d397SChris Mason buf = btrfs_find_create_tree_block(root, blocknr); 2115f39d397SChris Mason if (!buf) 212090d1875SChris Mason return 0; 2135f39d397SChris Mason read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree, 2145f39d397SChris Mason buf, 0); 2155f39d397SChris Mason free_extent_buffer(buf); 216de428b63SChris Mason return ret; 217090d1875SChris Mason } 218090d1875SChris Mason 2195f39d397SChris Mason struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 blocknr) 220e20d96d6SChris Mason { 2215f39d397SChris Mason struct extent_buffer *buf = NULL; 2225f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 223e20d96d6SChris Mason 2245f39d397SChris Mason buf = btrfs_find_create_tree_block(root, blocknr); 2255f39d397SChris Mason if (!buf) 226d98237b3SChris Mason return NULL; 2275f39d397SChris Mason read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree, 2285f39d397SChris Mason buf, 1); 2295f39d397SChris Mason return buf; 230eb60ceacSChris Mason } 231eb60ceacSChris Mason 232e089f05cSChris Mason int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2335f39d397SChris Mason struct extent_buffer *buf) 234ed2ff2cbSChris Mason { 2355f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 2365f39d397SChris Mason clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf); 2375f39d397SChris Mason return 0; 2385f39d397SChris Mason } 2395f39d397SChris Mason 2405f39d397SChris Mason int wait_on_tree_block_writeback(struct btrfs_root *root, 2415f39d397SChris Mason struct extent_buffer *buf) 2425f39d397SChris Mason { 2435f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 2445f39d397SChris Mason wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->extent_tree, 2455f39d397SChris Mason buf); 2465f39d397SChris Mason return 0; 2475f39d397SChris Mason } 2485f39d397SChris Mason 2495f39d397SChris Mason int set_tree_block_dirty(struct btrfs_root *root, struct extent_buffer *buf) 2505f39d397SChris Mason { 2515f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 2525f39d397SChris Mason set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf); 253ed2ff2cbSChris Mason return 0; 254ed2ff2cbSChris Mason } 255ed2ff2cbSChris Mason 2562c90e5d6SChris Mason static int __setup_root(int blocksize, 2579f5fae2fSChris Mason struct btrfs_root *root, 2589f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 259e20d96d6SChris Mason u64 objectid) 260d97e63b6SChris Mason { 261cfaa7295SChris Mason root->node = NULL; 2620f7d52f4SChris Mason root->inode = NULL; 263a28ec197SChris Mason root->commit_root = NULL; 2645f39d397SChris Mason root->sectorsize = blocksize; 2655f39d397SChris Mason root->nodesize = blocksize; 2665f39d397SChris Mason root->leafsize = blocksize; 267123abc88SChris Mason root->ref_cows = 0; 2689f5fae2fSChris Mason root->fs_info = fs_info; 2690f7d52f4SChris Mason root->objectid = objectid; 2700f7d52f4SChris Mason root->last_trans = 0; 2711b05da2eSChris Mason root->highest_inode = 0; 2721b05da2eSChris Mason root->last_inode_alloc = 0; 27358176a96SJosef Bacik root->name = NULL; 2743768f368SChris Mason memset(&root->root_key, 0, sizeof(root->root_key)); 2753768f368SChris Mason memset(&root->root_item, 0, sizeof(root->root_item)); 2766702ed49SChris Mason memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); 27758176a96SJosef Bacik memset(&root->root_kobj, 0, sizeof(root->root_kobj)); 27858176a96SJosef Bacik init_completion(&root->kobj_unregister); 279011410bdSChris Mason init_rwsem(&root->snap_sem); 2806702ed49SChris Mason root->defrag_running = 0; 2816702ed49SChris Mason root->defrag_level = 0; 2824d775673SChris Mason root->root_key.objectid = objectid; 2833768f368SChris Mason return 0; 2843768f368SChris Mason } 2853768f368SChris Mason 2862c90e5d6SChris Mason static int find_and_setup_root(int blocksize, 2879f5fae2fSChris Mason struct btrfs_root *tree_root, 2889f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 2899f5fae2fSChris Mason u64 objectid, 290e20d96d6SChris Mason struct btrfs_root *root) 2913768f368SChris Mason { 2923768f368SChris Mason int ret; 2933768f368SChris Mason 2942c90e5d6SChris Mason __setup_root(blocksize, root, fs_info, objectid); 2953768f368SChris Mason ret = btrfs_find_last_root(tree_root, objectid, 2963768f368SChris Mason &root->root_item, &root->root_key); 2973768f368SChris Mason BUG_ON(ret); 2983768f368SChris Mason 2993768f368SChris Mason root->node = read_tree_block(root, 3003768f368SChris Mason btrfs_root_blocknr(&root->root_item)); 3013768f368SChris Mason BUG_ON(!root->node); 302d97e63b6SChris Mason return 0; 303d97e63b6SChris Mason } 304d97e63b6SChris Mason 3055eda7b5eSChris Mason struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info, 3060f7d52f4SChris Mason struct btrfs_key *location) 3070f7d52f4SChris Mason { 3080f7d52f4SChris Mason struct btrfs_root *root; 3090f7d52f4SChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 3100f7d52f4SChris Mason struct btrfs_path *path; 3115f39d397SChris Mason struct extent_buffer *l; 3121b05da2eSChris Mason u64 highest_inode; 3130f7d52f4SChris Mason int ret = 0; 3140f7d52f4SChris Mason 3155eda7b5eSChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 3160cf6c620SChris Mason if (!root) 3170f7d52f4SChris Mason return ERR_PTR(-ENOMEM); 3180f7d52f4SChris Mason if (location->offset == (u64)-1) { 3190f7d52f4SChris Mason ret = find_and_setup_root(fs_info->sb->s_blocksize, 3200f7d52f4SChris Mason fs_info->tree_root, fs_info, 3210f7d52f4SChris Mason location->objectid, root); 3220f7d52f4SChris Mason if (ret) { 3230f7d52f4SChris Mason kfree(root); 3240f7d52f4SChris Mason return ERR_PTR(ret); 3250f7d52f4SChris Mason } 3260f7d52f4SChris Mason goto insert; 3270f7d52f4SChris Mason } 3280f7d52f4SChris Mason 3290f7d52f4SChris Mason __setup_root(fs_info->sb->s_blocksize, root, fs_info, 3300f7d52f4SChris Mason location->objectid); 3310f7d52f4SChris Mason 3320f7d52f4SChris Mason path = btrfs_alloc_path(); 3330f7d52f4SChris Mason BUG_ON(!path); 3340f7d52f4SChris Mason ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); 3350f7d52f4SChris Mason if (ret != 0) { 3360f7d52f4SChris Mason if (ret > 0) 3370f7d52f4SChris Mason ret = -ENOENT; 3380f7d52f4SChris Mason goto out; 3390f7d52f4SChris Mason } 3405f39d397SChris Mason l = path->nodes[0]; 3415f39d397SChris Mason read_extent_buffer(l, &root->root_item, 3425f39d397SChris Mason btrfs_item_ptr_offset(l, path->slots[0]), 3430f7d52f4SChris Mason sizeof(root->root_item)); 3440f7d52f4SChris Mason ret = 0; 3450f7d52f4SChris Mason out: 3460f7d52f4SChris Mason btrfs_release_path(root, path); 3470f7d52f4SChris Mason btrfs_free_path(path); 3480f7d52f4SChris Mason if (ret) { 3490f7d52f4SChris Mason kfree(root); 3500f7d52f4SChris Mason return ERR_PTR(ret); 3510f7d52f4SChris Mason } 3520f7d52f4SChris Mason root->node = read_tree_block(root, 3530f7d52f4SChris Mason btrfs_root_blocknr(&root->root_item)); 3540f7d52f4SChris Mason BUG_ON(!root->node); 3550f7d52f4SChris Mason insert: 3560f7d52f4SChris Mason root->ref_cows = 1; 3575eda7b5eSChris Mason ret = btrfs_find_highest_inode(root, &highest_inode); 3585eda7b5eSChris Mason if (ret == 0) { 3595eda7b5eSChris Mason root->highest_inode = highest_inode; 3605eda7b5eSChris Mason root->last_inode_alloc = highest_inode; 3615eda7b5eSChris Mason } 3625eda7b5eSChris Mason return root; 3635eda7b5eSChris Mason } 3645eda7b5eSChris Mason 3655eda7b5eSChris Mason struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, 36658176a96SJosef Bacik struct btrfs_key *location, 36758176a96SJosef Bacik const char *name, int namelen) 3685eda7b5eSChris Mason { 3695eda7b5eSChris Mason struct btrfs_root *root; 3705eda7b5eSChris Mason int ret; 3715eda7b5eSChris Mason 3725eda7b5eSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 3735eda7b5eSChris Mason (unsigned long)location->objectid); 3745eda7b5eSChris Mason if (root) 3755eda7b5eSChris Mason return root; 3765eda7b5eSChris Mason 3775eda7b5eSChris Mason root = btrfs_read_fs_root_no_radix(fs_info, location); 3785eda7b5eSChris Mason if (IS_ERR(root)) 3795eda7b5eSChris Mason return root; 3802619ba1fSChris Mason ret = radix_tree_insert(&fs_info->fs_roots_radix, 3812619ba1fSChris Mason (unsigned long)root->root_key.objectid, 3820f7d52f4SChris Mason root); 3830f7d52f4SChris Mason if (ret) { 3845f39d397SChris Mason free_extent_buffer(root->node); 3850f7d52f4SChris Mason kfree(root); 3860f7d52f4SChris Mason return ERR_PTR(ret); 3870f7d52f4SChris Mason } 38858176a96SJosef Bacik 38958176a96SJosef Bacik ret = btrfs_set_root_name(root, name, namelen); 39058176a96SJosef Bacik if (ret) { 3915f39d397SChris Mason free_extent_buffer(root->node); 39258176a96SJosef Bacik kfree(root); 39358176a96SJosef Bacik return ERR_PTR(ret); 39458176a96SJosef Bacik } 39558176a96SJosef Bacik 39658176a96SJosef Bacik ret = btrfs_sysfs_add_root(root); 39758176a96SJosef Bacik if (ret) { 3985f39d397SChris Mason free_extent_buffer(root->node); 39958176a96SJosef Bacik kfree(root->name); 40058176a96SJosef Bacik kfree(root); 40158176a96SJosef Bacik return ERR_PTR(ret); 40258176a96SJosef Bacik } 40358176a96SJosef Bacik 4045ce14bbcSChris Mason ret = btrfs_find_dead_roots(fs_info->tree_root, 4055ce14bbcSChris Mason root->root_key.objectid, root); 4065ce14bbcSChris Mason BUG_ON(ret); 4075ce14bbcSChris Mason 4080f7d52f4SChris Mason return root; 4090f7d52f4SChris Mason } 4100f7d52f4SChris Mason 4112c90e5d6SChris Mason struct btrfs_root *open_ctree(struct super_block *sb) 412eb60ceacSChris Mason { 413e20d96d6SChris Mason struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root), 414e20d96d6SChris Mason GFP_NOFS); 415e20d96d6SChris Mason struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root), 416e20d96d6SChris Mason GFP_NOFS); 417e20d96d6SChris Mason struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info), 418e20d96d6SChris Mason GFP_NOFS); 419eb60ceacSChris Mason int ret; 42039279cc3SChris Mason int err = -EIO; 4212c90e5d6SChris Mason struct btrfs_super_block *disk_super; 422eb60ceacSChris Mason 42339279cc3SChris Mason if (!extent_root || !tree_root || !fs_info) { 42439279cc3SChris Mason err = -ENOMEM; 42539279cc3SChris Mason goto fail; 42639279cc3SChris Mason } 4278ef97622SChris Mason init_bit_radix(&fs_info->pinned_radix); 4288ef97622SChris Mason init_bit_radix(&fs_info->pending_del_radix); 429e37c9e69SChris Mason init_bit_radix(&fs_info->extent_map_radix); 43026b8003fSChris Mason init_bit_radix(&fs_info->extent_ins_radix); 4310f7d52f4SChris Mason INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS); 4329078a3e1SChris Mason INIT_RADIX_TREE(&fs_info->block_group_radix, GFP_KERNEL); 433be744175SChris Mason INIT_RADIX_TREE(&fs_info->block_group_data_radix, GFP_KERNEL); 4348fd17795SChris Mason INIT_LIST_HEAD(&fs_info->trans_list); 435facda1e7SChris Mason INIT_LIST_HEAD(&fs_info->dead_roots); 43658176a96SJosef Bacik memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj)); 43758176a96SJosef Bacik init_completion(&fs_info->kobj_unregister); 4382c90e5d6SChris Mason sb_set_blocksize(sb, 4096); 4399f5fae2fSChris Mason fs_info->running_transaction = NULL; 44015ee9bc7SJosef Bacik fs_info->last_trans_committed = 0; 4419f5fae2fSChris Mason fs_info->tree_root = tree_root; 4429f5fae2fSChris Mason fs_info->extent_root = extent_root; 443e20d96d6SChris Mason fs_info->sb = sb; 444d98237b3SChris Mason fs_info->btree_inode = new_inode(sb); 445d98237b3SChris Mason fs_info->btree_inode->i_ino = 1; 4462c90e5d6SChris Mason fs_info->btree_inode->i_nlink = 1; 447d98237b3SChris Mason fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size; 448d98237b3SChris Mason fs_info->btree_inode->i_mapping->a_ops = &btree_aops; 4495f39d397SChris Mason extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, 4505f39d397SChris Mason fs_info->btree_inode->i_mapping, 4515f39d397SChris Mason GFP_NOFS); 452e66f709bSChris Mason fs_info->do_barriers = 1; 453facda1e7SChris Mason fs_info->closing = 0; 454facda1e7SChris Mason 45508607c1bSChris Mason INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner); 4560f7d52f4SChris Mason BTRFS_I(fs_info->btree_inode)->root = tree_root; 4570f7d52f4SChris Mason memset(&BTRFS_I(fs_info->btree_inode)->location, 0, 4580f7d52f4SChris Mason sizeof(struct btrfs_key)); 45922b0ebdaSChris Mason insert_inode_hash(fs_info->btree_inode); 460d98237b3SChris Mason mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); 46139279cc3SChris Mason 46279154b1bSChris Mason mutex_init(&fs_info->trans_mutex); 463d561c025SChris Mason mutex_init(&fs_info->fs_mutex); 4643768f368SChris Mason 4652c90e5d6SChris Mason __setup_root(sb->s_blocksize, tree_root, 4662c90e5d6SChris Mason fs_info, BTRFS_ROOT_TREE_OBJECTID); 4677eccb903SChris Mason 4682c90e5d6SChris Mason fs_info->sb_buffer = read_tree_block(tree_root, 4692c90e5d6SChris Mason BTRFS_SUPER_INFO_OFFSET / 4702c90e5d6SChris Mason sb->s_blocksize); 471d98237b3SChris Mason 4720f7d52f4SChris Mason if (!fs_info->sb_buffer) 47339279cc3SChris Mason goto fail_iput; 47439279cc3SChris Mason 4755f39d397SChris Mason read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0, 4765f39d397SChris Mason sizeof(fs_info->super_copy)); 4775f39d397SChris Mason 4785f39d397SChris Mason read_extent_buffer(fs_info->sb_buffer, fs_info->fsid, 4795f39d397SChris Mason (unsigned long)btrfs_super_fsid(fs_info->sb_buffer), 4805f39d397SChris Mason BTRFS_FSID_SIZE); 4815f39d397SChris Mason disk_super = &fs_info->super_copy; 4820f7d52f4SChris Mason if (!btrfs_super_root(disk_super)) 48339279cc3SChris Mason goto fail_sb_buffer; 4840f7d52f4SChris Mason 4858352d8a4SChris Mason i_size_write(fs_info->btree_inode, 4868352d8a4SChris Mason btrfs_super_total_blocks(disk_super) << 4878352d8a4SChris Mason fs_info->btree_inode->i_blkbits); 4888352d8a4SChris Mason 48939279cc3SChris Mason 49039279cc3SChris Mason if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, 49139279cc3SChris Mason sizeof(disk_super->magic))) { 49239279cc3SChris Mason printk("btrfs: valid FS not found on %s\n", sb->s_id); 49339279cc3SChris Mason goto fail_sb_buffer; 49439279cc3SChris Mason } 495e20d96d6SChris Mason tree_root->node = read_tree_block(tree_root, 496e20d96d6SChris Mason btrfs_super_root(disk_super)); 49739279cc3SChris Mason if (!tree_root->node) 49839279cc3SChris Mason goto fail_sb_buffer; 4993768f368SChris Mason 5002c90e5d6SChris Mason mutex_lock(&fs_info->fs_mutex); 5012c90e5d6SChris Mason ret = find_and_setup_root(sb->s_blocksize, tree_root, fs_info, 502e20d96d6SChris Mason BTRFS_EXTENT_TREE_OBJECTID, extent_root); 50339279cc3SChris Mason if (ret) { 50439279cc3SChris Mason mutex_unlock(&fs_info->fs_mutex); 50539279cc3SChris Mason goto fail_tree_root; 50639279cc3SChris Mason } 5073768f368SChris Mason 5089078a3e1SChris Mason btrfs_read_block_groups(extent_root); 5099078a3e1SChris Mason 5100f7d52f4SChris Mason fs_info->generation = btrfs_super_generation(disk_super) + 1; 5115be6f7f1SChris Mason mutex_unlock(&fs_info->fs_mutex); 5120f7d52f4SChris Mason return tree_root; 51339279cc3SChris Mason 51439279cc3SChris Mason fail_tree_root: 5155f39d397SChris Mason free_extent_buffer(tree_root->node); 51639279cc3SChris Mason fail_sb_buffer: 5175f39d397SChris Mason free_extent_buffer(fs_info->sb_buffer); 51839279cc3SChris Mason fail_iput: 51939279cc3SChris Mason iput(fs_info->btree_inode); 52039279cc3SChris Mason fail: 52139279cc3SChris Mason kfree(extent_root); 52239279cc3SChris Mason kfree(tree_root); 52339279cc3SChris Mason kfree(fs_info); 52439279cc3SChris Mason return ERR_PTR(err); 525eb60ceacSChris Mason } 526eb60ceacSChris Mason 527e089f05cSChris Mason int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root 52879154b1bSChris Mason *root) 529cfaa7295SChris Mason { 530e66f709bSChris Mason int ret; 5315f39d397SChris Mason struct extent_buffer *super = root->fs_info->sb_buffer; 5325f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 5332c90e5d6SChris Mason 5345f39d397SChris Mason set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, super); 5355f39d397SChris Mason ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping, 5365f39d397SChris Mason super->start, super->len); 5375f39d397SChris Mason return ret; 538cfaa7295SChris Mason } 539cfaa7295SChris Mason 5405eda7b5eSChris Mason int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) 5412619ba1fSChris Mason { 5422619ba1fSChris Mason radix_tree_delete(&fs_info->fs_roots_radix, 5432619ba1fSChris Mason (unsigned long)root->root_key.objectid); 54458176a96SJosef Bacik btrfs_sysfs_del_root(root); 5452619ba1fSChris Mason if (root->inode) 5462619ba1fSChris Mason iput(root->inode); 5472619ba1fSChris Mason if (root->node) 5485f39d397SChris Mason free_extent_buffer(root->node); 5492619ba1fSChris Mason if (root->commit_root) 5505f39d397SChris Mason free_extent_buffer(root->commit_root); 55158176a96SJosef Bacik if (root->name) 55258176a96SJosef Bacik kfree(root->name); 5532619ba1fSChris Mason kfree(root); 5542619ba1fSChris Mason return 0; 5552619ba1fSChris Mason } 5562619ba1fSChris Mason 55735b7e476SChris Mason static int del_fs_roots(struct btrfs_fs_info *fs_info) 5580f7d52f4SChris Mason { 5590f7d52f4SChris Mason int ret; 5600f7d52f4SChris Mason struct btrfs_root *gang[8]; 5610f7d52f4SChris Mason int i; 5620f7d52f4SChris Mason 5630f7d52f4SChris Mason while(1) { 5640f7d52f4SChris Mason ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 5650f7d52f4SChris Mason (void **)gang, 0, 5660f7d52f4SChris Mason ARRAY_SIZE(gang)); 5670f7d52f4SChris Mason if (!ret) 5680f7d52f4SChris Mason break; 5692619ba1fSChris Mason for (i = 0; i < ret; i++) 5705eda7b5eSChris Mason btrfs_free_fs_root(fs_info, gang[i]); 5710f7d52f4SChris Mason } 5720f7d52f4SChris Mason return 0; 5730f7d52f4SChris Mason } 574b4100d64SChris Mason 575e20d96d6SChris Mason int close_ctree(struct btrfs_root *root) 576eb60ceacSChris Mason { 5773768f368SChris Mason int ret; 578e089f05cSChris Mason struct btrfs_trans_handle *trans; 5790f7d52f4SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 580e089f05cSChris Mason 581facda1e7SChris Mason fs_info->closing = 1; 58208607c1bSChris Mason btrfs_transaction_flush_work(root); 5830f7d52f4SChris Mason mutex_lock(&fs_info->fs_mutex); 5846702ed49SChris Mason btrfs_defrag_dirty_roots(root->fs_info); 58579154b1bSChris Mason trans = btrfs_start_transaction(root, 1); 58654aa1f4dSChris Mason ret = btrfs_commit_transaction(trans, root); 58779154b1bSChris Mason /* run commit again to drop the original snapshot */ 58879154b1bSChris Mason trans = btrfs_start_transaction(root, 1); 58979154b1bSChris Mason btrfs_commit_transaction(trans, root); 59079154b1bSChris Mason ret = btrfs_write_and_wait_transaction(NULL, root); 5919f5fae2fSChris Mason BUG_ON(ret); 59279154b1bSChris Mason write_ctree_super(NULL, root); 5930f7d52f4SChris Mason mutex_unlock(&fs_info->fs_mutex); 594ed2ff2cbSChris Mason 5950f7d52f4SChris Mason if (fs_info->extent_root->node) 5965f39d397SChris Mason free_extent_buffer(fs_info->extent_root->node); 5970f7d52f4SChris Mason if (fs_info->tree_root->node) 5985f39d397SChris Mason free_extent_buffer(fs_info->tree_root->node); 5995f39d397SChris Mason free_extent_buffer(fs_info->sb_buffer); 6000f7d52f4SChris Mason truncate_inode_pages(fs_info->btree_inode->i_mapping, 0); 6010f7d52f4SChris Mason iput(fs_info->btree_inode); 6027eccb903SChris Mason 6039078a3e1SChris Mason btrfs_free_block_groups(root->fs_info); 6040f7d52f4SChris Mason del_fs_roots(fs_info); 6050f7d52f4SChris Mason kfree(fs_info->extent_root); 6060f7d52f4SChris Mason kfree(fs_info->tree_root); 607eb60ceacSChris Mason return 0; 608eb60ceacSChris Mason } 609eb60ceacSChris Mason 6105f39d397SChris Mason int btrfs_buffer_uptodate(struct extent_buffer *buf) 611ccd467d6SChris Mason { 6125f39d397SChris Mason struct inode *btree_inode = buf->pages[0]->mapping->host; 6135f39d397SChris Mason return extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree, buf); 6145f39d397SChris Mason } 6156702ed49SChris Mason 6165f39d397SChris Mason int btrfs_set_buffer_uptodate(struct extent_buffer *buf) 6175f39d397SChris Mason { 6185f39d397SChris Mason struct inode *btree_inode = buf->pages[0]->mapping->host; 6195f39d397SChris Mason return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree, 6205f39d397SChris Mason buf); 6215f39d397SChris Mason } 6225f39d397SChris Mason 6235f39d397SChris Mason void btrfs_mark_buffer_dirty(struct extent_buffer *buf) 6245f39d397SChris Mason { 6255f39d397SChris Mason struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root; 6265f39d397SChris Mason u64 transid = btrfs_header_generation(buf); 6275f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 6286702ed49SChris Mason 629ccd467d6SChris Mason if (transid != root->fs_info->generation) { 630ccd467d6SChris Mason printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n", 6315f39d397SChris Mason (unsigned long long)extent_buffer_blocknr(buf), 632ccd467d6SChris Mason transid, root->fs_info->generation); 633ccd467d6SChris Mason WARN_ON(1); 634ccd467d6SChris Mason } 6355f39d397SChris Mason set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf); 636eb60ceacSChris Mason } 637eb60ceacSChris Mason 638d3c2fdcfSChris Mason void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) 63935b7e476SChris Mason { 640d3c2fdcfSChris Mason balance_dirty_pages_ratelimited_nr( 641d3c2fdcfSChris Mason root->fs_info->btree_inode->i_mapping, nr); 64235b7e476SChris Mason } 643