1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 26cbd5570SChris Mason /* 36cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 46cbd5570SChris Mason */ 56cbd5570SChris Mason 6065631f6SChris Mason #include <linux/bio.h> 75a0e3ad6STejun Heo #include <linux/slab.h> 8065631f6SChris Mason #include <linux/pagemap.h> 9065631f6SChris Mason #include <linux/highmem.h> 10a3d46aeaSNikolay Borisov #include <linux/sched/mm.h> 11d5178578SJohannes Thumshirn #include <crypto/hash.h> 12cea62800SJohannes Thumshirn #include "misc.h" 131e1d2701SChris Mason #include "ctree.h" 14dee26a9fSChris Mason #include "disk-io.h" 159f5fae2fSChris Mason #include "transaction.h" 16facc8a22SMiao Xie #include "volumes.h" 171de037a4SChris Mason #include "print-tree.h" 18ebb8765bSAnand Jain #include "compression.h" 191e1d2701SChris Mason 2042049bf6SChris Mason #define __MAX_CSUM_ITEMS(r, size) ((unsigned long)(((BTRFS_LEAF_DATA_SIZE(r) - \ 2142049bf6SChris Mason sizeof(struct btrfs_item) * 2) / \ 2242049bf6SChris Mason size) - 1)) 2307d400a6SYan Zheng 24221b8318SZach Brown #define MAX_CSUM_ITEMS(r, size) (min_t(u32, __MAX_CSUM_ITEMS(r, size), \ 2509cbfeafSKirill A. Shutemov PAGE_SIZE)) 267ca4be45SChris Mason 2741a2ee75SJosef Bacik /** 28ca4207aeSNikolay Borisov * Set inode's size according to filesystem options 29ca4207aeSNikolay Borisov * 30ca4207aeSNikolay Borisov * @inode: inode we want to update the disk_i_size for 31ca4207aeSNikolay Borisov * @new_i_size: i_size we want to set to, 0 if we use i_size 3241a2ee75SJosef Bacik * 3341a2ee75SJosef Bacik * With NO_HOLES set this simply sets the disk_is_size to whatever i_size_read() 3441a2ee75SJosef Bacik * returns as it is perfectly fine with a file that has holes without hole file 3541a2ee75SJosef Bacik * extent items. 3641a2ee75SJosef Bacik * 3741a2ee75SJosef Bacik * However without NO_HOLES we need to only return the area that is contiguous 3841a2ee75SJosef Bacik * from the 0 offset of the file. Otherwise we could end up adjust i_size up 3941a2ee75SJosef Bacik * to an extent that has a gap in between. 4041a2ee75SJosef Bacik * 4141a2ee75SJosef Bacik * Finally new_i_size should only be set in the case of truncate where we're not 4241a2ee75SJosef Bacik * ready to use i_size_read() as the limiter yet. 4341a2ee75SJosef Bacik */ 4476aea537SNikolay Borisov void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size) 4541a2ee75SJosef Bacik { 4676aea537SNikolay Borisov struct btrfs_fs_info *fs_info = inode->root->fs_info; 4741a2ee75SJosef Bacik u64 start, end, i_size; 4841a2ee75SJosef Bacik int ret; 4941a2ee75SJosef Bacik 5076aea537SNikolay Borisov i_size = new_i_size ?: i_size_read(&inode->vfs_inode); 5141a2ee75SJosef Bacik if (btrfs_fs_incompat(fs_info, NO_HOLES)) { 5276aea537SNikolay Borisov inode->disk_i_size = i_size; 5341a2ee75SJosef Bacik return; 5441a2ee75SJosef Bacik } 5541a2ee75SJosef Bacik 5676aea537SNikolay Borisov spin_lock(&inode->lock); 5776aea537SNikolay Borisov ret = find_contiguous_extent_bit(&inode->file_extent_tree, 0, &start, 5876aea537SNikolay Borisov &end, EXTENT_DIRTY); 5941a2ee75SJosef Bacik if (!ret && start == 0) 6041a2ee75SJosef Bacik i_size = min(i_size, end + 1); 6141a2ee75SJosef Bacik else 6241a2ee75SJosef Bacik i_size = 0; 6376aea537SNikolay Borisov inode->disk_i_size = i_size; 6476aea537SNikolay Borisov spin_unlock(&inode->lock); 6541a2ee75SJosef Bacik } 6641a2ee75SJosef Bacik 6741a2ee75SJosef Bacik /** 68ca4207aeSNikolay Borisov * Mark range within a file as having a new extent inserted 69ca4207aeSNikolay Borisov * 70ca4207aeSNikolay Borisov * @inode: inode being modified 71ca4207aeSNikolay Borisov * @start: start file offset of the file extent we've inserted 72ca4207aeSNikolay Borisov * @len: logical length of the file extent item 7341a2ee75SJosef Bacik * 7441a2ee75SJosef Bacik * Call when we are inserting a new file extent where there was none before. 7541a2ee75SJosef Bacik * Does not need to call this in the case where we're replacing an existing file 7641a2ee75SJosef Bacik * extent, however if not sure it's fine to call this multiple times. 7741a2ee75SJosef Bacik * 7841a2ee75SJosef Bacik * The start and len must match the file extent item, so thus must be sectorsize 7941a2ee75SJosef Bacik * aligned. 8041a2ee75SJosef Bacik */ 8141a2ee75SJosef Bacik int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start, 8241a2ee75SJosef Bacik u64 len) 8341a2ee75SJosef Bacik { 8441a2ee75SJosef Bacik if (len == 0) 8541a2ee75SJosef Bacik return 0; 8641a2ee75SJosef Bacik 8741a2ee75SJosef Bacik ASSERT(IS_ALIGNED(start + len, inode->root->fs_info->sectorsize)); 8841a2ee75SJosef Bacik 8941a2ee75SJosef Bacik if (btrfs_fs_incompat(inode->root->fs_info, NO_HOLES)) 9041a2ee75SJosef Bacik return 0; 9141a2ee75SJosef Bacik return set_extent_bits(&inode->file_extent_tree, start, start + len - 1, 9241a2ee75SJosef Bacik EXTENT_DIRTY); 9341a2ee75SJosef Bacik } 9441a2ee75SJosef Bacik 9541a2ee75SJosef Bacik /** 96ca4207aeSNikolay Borisov * Marks an inode range as not having a backing extent 97ca4207aeSNikolay Borisov * 98ca4207aeSNikolay Borisov * @inode: inode being modified 99ca4207aeSNikolay Borisov * @start: start file offset of the file extent we've inserted 100ca4207aeSNikolay Borisov * @len: logical length of the file extent item 10141a2ee75SJosef Bacik * 10241a2ee75SJosef Bacik * Called when we drop a file extent, for example when we truncate. Doesn't 10341a2ee75SJosef Bacik * need to be called for cases where we're replacing a file extent, like when 10441a2ee75SJosef Bacik * we've COWed a file extent. 10541a2ee75SJosef Bacik * 10641a2ee75SJosef Bacik * The start and len must match the file extent item, so thus must be sectorsize 10741a2ee75SJosef Bacik * aligned. 10841a2ee75SJosef Bacik */ 10941a2ee75SJosef Bacik int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start, 11041a2ee75SJosef Bacik u64 len) 11141a2ee75SJosef Bacik { 11241a2ee75SJosef Bacik if (len == 0) 11341a2ee75SJosef Bacik return 0; 11441a2ee75SJosef Bacik 11541a2ee75SJosef Bacik ASSERT(IS_ALIGNED(start + len, inode->root->fs_info->sectorsize) || 11641a2ee75SJosef Bacik len == (u64)-1); 11741a2ee75SJosef Bacik 11841a2ee75SJosef Bacik if (btrfs_fs_incompat(inode->root->fs_info, NO_HOLES)) 11941a2ee75SJosef Bacik return 0; 12041a2ee75SJosef Bacik return clear_extent_bit(&inode->file_extent_tree, start, 121bd015294SJosef Bacik start + len - 1, EXTENT_DIRTY, NULL); 12241a2ee75SJosef Bacik } 12341a2ee75SJosef Bacik 1241e25a2e3SJohannes Thumshirn static inline u32 max_ordered_sum_bytes(struct btrfs_fs_info *fs_info, 1251e25a2e3SJohannes Thumshirn u16 csum_size) 1261e25a2e3SJohannes Thumshirn { 1271e25a2e3SJohannes Thumshirn u32 ncsums = (PAGE_SIZE - sizeof(struct btrfs_ordered_sum)) / csum_size; 1281e25a2e3SJohannes Thumshirn 1291e25a2e3SJohannes Thumshirn return ncsums * fs_info->sectorsize; 1301e25a2e3SJohannes Thumshirn } 13107d400a6SYan Zheng 1322b6433c7SJosef Bacik /* 1332b6433c7SJosef Bacik * Calculate the total size needed to allocate for an ordered sum structure 1342b6433c7SJosef Bacik * spanning @bytes in the file. 1352b6433c7SJosef Bacik */ 1362b6433c7SJosef Bacik static int btrfs_ordered_sum_size(struct btrfs_fs_info *fs_info, unsigned long bytes) 1372b6433c7SJosef Bacik { 1382b6433c7SJosef Bacik int num_sectors = (int)DIV_ROUND_UP(bytes, fs_info->sectorsize); 1392b6433c7SJosef Bacik 1402b6433c7SJosef Bacik return sizeof(struct btrfs_ordered_sum) + num_sectors * fs_info->csum_size; 1412b6433c7SJosef Bacik } 1422b6433c7SJosef Bacik 143d1f68ba0SOmar Sandoval int btrfs_insert_hole_extent(struct btrfs_trans_handle *trans, 144dee26a9fSChris Mason struct btrfs_root *root, 145d1f68ba0SOmar Sandoval u64 objectid, u64 pos, u64 num_bytes) 1469f5fae2fSChris Mason { 147dee26a9fSChris Mason int ret = 0; 148dee26a9fSChris Mason struct btrfs_file_extent_item *item; 149dee26a9fSChris Mason struct btrfs_key file_key; 1505caf2a00SChris Mason struct btrfs_path *path; 1515f39d397SChris Mason struct extent_buffer *leaf; 152dee26a9fSChris Mason 1535caf2a00SChris Mason path = btrfs_alloc_path(); 154db5b493aSTsutomu Itoh if (!path) 155db5b493aSTsutomu Itoh return -ENOMEM; 156dee26a9fSChris Mason file_key.objectid = objectid; 157b18c6685SChris Mason file_key.offset = pos; 158962a298fSDavid Sterba file_key.type = BTRFS_EXTENT_DATA_KEY; 159dee26a9fSChris Mason 1605caf2a00SChris Mason ret = btrfs_insert_empty_item(trans, root, path, &file_key, 161dee26a9fSChris Mason sizeof(*item)); 16254aa1f4dSChris Mason if (ret < 0) 16354aa1f4dSChris Mason goto out; 16479787eaaSJeff Mahoney BUG_ON(ret); /* Can't happen */ 1655f39d397SChris Mason leaf = path->nodes[0]; 1665f39d397SChris Mason item = btrfs_item_ptr(leaf, path->slots[0], 167dee26a9fSChris Mason struct btrfs_file_extent_item); 168d1f68ba0SOmar Sandoval btrfs_set_file_extent_disk_bytenr(leaf, item, 0); 169d1f68ba0SOmar Sandoval btrfs_set_file_extent_disk_num_bytes(leaf, item, 0); 170d1f68ba0SOmar Sandoval btrfs_set_file_extent_offset(leaf, item, 0); 171db94535dSChris Mason btrfs_set_file_extent_num_bytes(leaf, item, num_bytes); 172d1f68ba0SOmar Sandoval btrfs_set_file_extent_ram_bytes(leaf, item, num_bytes); 1735f39d397SChris Mason btrfs_set_file_extent_generation(leaf, item, trans->transid); 1745f39d397SChris Mason btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG); 175d1f68ba0SOmar Sandoval btrfs_set_file_extent_compression(leaf, item, 0); 176d1f68ba0SOmar Sandoval btrfs_set_file_extent_encryption(leaf, item, 0); 177d1f68ba0SOmar Sandoval btrfs_set_file_extent_other_encoding(leaf, item, 0); 178c8b97818SChris Mason 1795f39d397SChris Mason btrfs_mark_buffer_dirty(leaf); 18054aa1f4dSChris Mason out: 1815caf2a00SChris Mason btrfs_free_path(path); 18254aa1f4dSChris Mason return ret; 1839f5fae2fSChris Mason } 184dee26a9fSChris Mason 18548a3b636SEric Sandeen static struct btrfs_csum_item * 18648a3b636SEric Sandeen btrfs_lookup_csum(struct btrfs_trans_handle *trans, 187b18c6685SChris Mason struct btrfs_root *root, 1886567e837SChris Mason struct btrfs_path *path, 189d20f7043SChris Mason u64 bytenr, int cow) 1906567e837SChris Mason { 1910b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 1926567e837SChris Mason int ret; 1936567e837SChris Mason struct btrfs_key file_key; 1946567e837SChris Mason struct btrfs_key found_key; 1956567e837SChris Mason struct btrfs_csum_item *item; 1965f39d397SChris Mason struct extent_buffer *leaf; 1976567e837SChris Mason u64 csum_offset = 0; 198223486c2SDavid Sterba const u32 csum_size = fs_info->csum_size; 199a429e513SChris Mason int csums_in_item; 2006567e837SChris Mason 201d20f7043SChris Mason file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; 202d20f7043SChris Mason file_key.offset = bytenr; 203962a298fSDavid Sterba file_key.type = BTRFS_EXTENT_CSUM_KEY; 204b18c6685SChris Mason ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow); 2056567e837SChris Mason if (ret < 0) 2066567e837SChris Mason goto fail; 2075f39d397SChris Mason leaf = path->nodes[0]; 2086567e837SChris Mason if (ret > 0) { 2096567e837SChris Mason ret = 1; 21070b2befdSChris Mason if (path->slots[0] == 0) 2116567e837SChris Mason goto fail; 2126567e837SChris Mason path->slots[0]--; 2135f39d397SChris Mason btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); 214962a298fSDavid Sterba if (found_key.type != BTRFS_EXTENT_CSUM_KEY) 2156567e837SChris Mason goto fail; 216d20f7043SChris Mason 217d20f7043SChris Mason csum_offset = (bytenr - found_key.offset) >> 218265fdfa6SDavid Sterba fs_info->sectorsize_bits; 2193212fa14SJosef Bacik csums_in_item = btrfs_item_size(leaf, path->slots[0]); 220607d432dSJosef Bacik csums_in_item /= csum_size; 221a429e513SChris Mason 22282d130ffSMiao Xie if (csum_offset == csums_in_item) { 223a429e513SChris Mason ret = -EFBIG; 2246567e837SChris Mason goto fail; 22582d130ffSMiao Xie } else if (csum_offset > csums_in_item) { 22682d130ffSMiao Xie goto fail; 2276567e837SChris Mason } 2286567e837SChris Mason } 2296567e837SChris Mason item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); 230509659cdSChris Mason item = (struct btrfs_csum_item *)((unsigned char *)item + 231607d432dSJosef Bacik csum_offset * csum_size); 2326567e837SChris Mason return item; 2336567e837SChris Mason fail: 2346567e837SChris Mason if (ret > 0) 235b18c6685SChris Mason ret = -ENOENT; 2366567e837SChris Mason return ERR_PTR(ret); 2376567e837SChris Mason } 2386567e837SChris Mason 239dee26a9fSChris Mason int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, 240dee26a9fSChris Mason struct btrfs_root *root, 241dee26a9fSChris Mason struct btrfs_path *path, u64 objectid, 2429773a788SChris Mason u64 offset, int mod) 243dee26a9fSChris Mason { 244dee26a9fSChris Mason struct btrfs_key file_key; 245dee26a9fSChris Mason int ins_len = mod < 0 ? -1 : 0; 246dee26a9fSChris Mason int cow = mod != 0; 247dee26a9fSChris Mason 248dee26a9fSChris Mason file_key.objectid = objectid; 24970b2befdSChris Mason file_key.offset = offset; 250962a298fSDavid Sterba file_key.type = BTRFS_EXTENT_DATA_KEY; 251f8ee80deSMarcos Paulo de Souza 252f8ee80deSMarcos Paulo de Souza return btrfs_search_slot(trans, root, &file_key, path, ins_len, cow); 253dee26a9fSChris Mason } 254f254e52cSChris Mason 2556275193eSQu Wenruo /* 2566275193eSQu Wenruo * Find checksums for logical bytenr range [disk_bytenr, disk_bytenr + len) and 2576275193eSQu Wenruo * estore the result to @dst. 2586275193eSQu Wenruo * 2596275193eSQu Wenruo * Return >0 for the number of sectors we found. 2606275193eSQu Wenruo * Return 0 for the range [disk_bytenr, disk_bytenr + sectorsize) has no csum 2616275193eSQu Wenruo * for it. Caller may want to try next sector until one range is hit. 2626275193eSQu Wenruo * Return <0 for fatal error. 2636275193eSQu Wenruo */ 2646275193eSQu Wenruo static int search_csum_tree(struct btrfs_fs_info *fs_info, 2656275193eSQu Wenruo struct btrfs_path *path, u64 disk_bytenr, 2666275193eSQu Wenruo u64 len, u8 *dst) 2676275193eSQu Wenruo { 268fc28b25eSJosef Bacik struct btrfs_root *csum_root; 2696275193eSQu Wenruo struct btrfs_csum_item *item = NULL; 2706275193eSQu Wenruo struct btrfs_key key; 2716275193eSQu Wenruo const u32 sectorsize = fs_info->sectorsize; 2726275193eSQu Wenruo const u32 csum_size = fs_info->csum_size; 2736275193eSQu Wenruo u32 itemsize; 2746275193eSQu Wenruo int ret; 2756275193eSQu Wenruo u64 csum_start; 2766275193eSQu Wenruo u64 csum_len; 2776275193eSQu Wenruo 2786275193eSQu Wenruo ASSERT(IS_ALIGNED(disk_bytenr, sectorsize) && 2796275193eSQu Wenruo IS_ALIGNED(len, sectorsize)); 2806275193eSQu Wenruo 2816275193eSQu Wenruo /* Check if the current csum item covers disk_bytenr */ 2826275193eSQu Wenruo if (path->nodes[0]) { 2836275193eSQu Wenruo item = btrfs_item_ptr(path->nodes[0], path->slots[0], 2846275193eSQu Wenruo struct btrfs_csum_item); 2856275193eSQu Wenruo btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 2863212fa14SJosef Bacik itemsize = btrfs_item_size(path->nodes[0], path->slots[0]); 2876275193eSQu Wenruo 2886275193eSQu Wenruo csum_start = key.offset; 2896275193eSQu Wenruo csum_len = (itemsize / csum_size) * sectorsize; 2906275193eSQu Wenruo 2916275193eSQu Wenruo if (in_range(disk_bytenr, csum_start, csum_len)) 2926275193eSQu Wenruo goto found; 2936275193eSQu Wenruo } 2946275193eSQu Wenruo 2956275193eSQu Wenruo /* Current item doesn't contain the desired range, search again */ 2966275193eSQu Wenruo btrfs_release_path(path); 297fc28b25eSJosef Bacik csum_root = btrfs_csum_root(fs_info, disk_bytenr); 298fc28b25eSJosef Bacik item = btrfs_lookup_csum(NULL, csum_root, path, disk_bytenr, 0); 2996275193eSQu Wenruo if (IS_ERR(item)) { 3006275193eSQu Wenruo ret = PTR_ERR(item); 3016275193eSQu Wenruo goto out; 3026275193eSQu Wenruo } 3036275193eSQu Wenruo btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 3043212fa14SJosef Bacik itemsize = btrfs_item_size(path->nodes[0], path->slots[0]); 3056275193eSQu Wenruo 3066275193eSQu Wenruo csum_start = key.offset; 3076275193eSQu Wenruo csum_len = (itemsize / csum_size) * sectorsize; 3086275193eSQu Wenruo ASSERT(in_range(disk_bytenr, csum_start, csum_len)); 3096275193eSQu Wenruo 3106275193eSQu Wenruo found: 3116275193eSQu Wenruo ret = (min(csum_start + csum_len, disk_bytenr + len) - 3126275193eSQu Wenruo disk_bytenr) >> fs_info->sectorsize_bits; 3136275193eSQu Wenruo read_extent_buffer(path->nodes[0], dst, (unsigned long)item, 3146275193eSQu Wenruo ret * csum_size); 3156275193eSQu Wenruo out: 31603ddb19dSJosef Bacik if (ret == -ENOENT || ret == -EFBIG) 3176275193eSQu Wenruo ret = 0; 3186275193eSQu Wenruo return ret; 3196275193eSQu Wenruo } 3206275193eSQu Wenruo 3216275193eSQu Wenruo /* 3226275193eSQu Wenruo * Locate the file_offset of @cur_disk_bytenr of a @bio. 3236275193eSQu Wenruo * 3246275193eSQu Wenruo * Bio of btrfs represents read range of 3256275193eSQu Wenruo * [bi_sector << 9, bi_sector << 9 + bi_size). 3266275193eSQu Wenruo * Knowing this, we can iterate through each bvec to locate the page belong to 3276275193eSQu Wenruo * @cur_disk_bytenr and get the file offset. 3286275193eSQu Wenruo * 3296275193eSQu Wenruo * @inode is used to determine if the bvec page really belongs to @inode. 3306275193eSQu Wenruo * 3316275193eSQu Wenruo * Return 0 if we can't find the file offset 3326275193eSQu Wenruo * Return >0 if we find the file offset and restore it to @file_offset_ret 3336275193eSQu Wenruo */ 3346275193eSQu Wenruo static int search_file_offset_in_bio(struct bio *bio, struct inode *inode, 3356275193eSQu Wenruo u64 disk_bytenr, u64 *file_offset_ret) 3366275193eSQu Wenruo { 3376275193eSQu Wenruo struct bvec_iter iter; 3386275193eSQu Wenruo struct bio_vec bvec; 3396275193eSQu Wenruo u64 cur = bio->bi_iter.bi_sector << SECTOR_SHIFT; 3406275193eSQu Wenruo int ret = 0; 3416275193eSQu Wenruo 3426275193eSQu Wenruo bio_for_each_segment(bvec, bio, iter) { 3436275193eSQu Wenruo struct page *page = bvec.bv_page; 3446275193eSQu Wenruo 3456275193eSQu Wenruo if (cur > disk_bytenr) 3466275193eSQu Wenruo break; 3476275193eSQu Wenruo if (cur + bvec.bv_len <= disk_bytenr) { 3486275193eSQu Wenruo cur += bvec.bv_len; 3496275193eSQu Wenruo continue; 3506275193eSQu Wenruo } 3516275193eSQu Wenruo ASSERT(in_range(disk_bytenr, cur, bvec.bv_len)); 3526275193eSQu Wenruo if (page->mapping && page->mapping->host && 3536275193eSQu Wenruo page->mapping->host == inode) { 3546275193eSQu Wenruo ret = 1; 3556275193eSQu Wenruo *file_offset_ret = page_offset(page) + bvec.bv_offset + 3566275193eSQu Wenruo disk_bytenr - cur; 3576275193eSQu Wenruo break; 3586275193eSQu Wenruo } 3596275193eSQu Wenruo } 3606275193eSQu Wenruo return ret; 3616275193eSQu Wenruo } 3626275193eSQu Wenruo 363e62958fcSOmar Sandoval /** 3646275193eSQu Wenruo * Lookup the checksum for the read bio in csum tree. 3659e46458aSQu Wenruo * 366e62958fcSOmar Sandoval * @inode: inode that the bio is for. 367fb30f470SOmar Sandoval * @bio: bio to look up. 368fb30f470SOmar Sandoval * @dst: Buffer of size nblocks * btrfs_super_csum_size() used to return 369fb30f470SOmar Sandoval * checksum (nblocks = bio->bi_iter.bi_size / fs_info->sectorsize). If 370fb30f470SOmar Sandoval * NULL, the checksum buffer is allocated and returned in 371c3a3b19bSQu Wenruo * btrfs_bio(bio)->csum instead. 372e62958fcSOmar Sandoval * 373e62958fcSOmar Sandoval * Return: BLK_STS_RESOURCE if allocating memory fails, BLK_STS_OK otherwise. 374e62958fcSOmar Sandoval */ 3756275193eSQu Wenruo blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u8 *dst) 37661b49440SChris Mason { 3770b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 378facc8a22SMiao Xie struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 3791784b7d5SJosef Bacik struct btrfs_bio *bbio = NULL; 380facc8a22SMiao Xie struct btrfs_path *path; 3816275193eSQu Wenruo const u32 sectorsize = fs_info->sectorsize; 382223486c2SDavid Sterba const u32 csum_size = fs_info->csum_size; 3836275193eSQu Wenruo u32 orig_len = bio->bi_iter.bi_size; 3846275193eSQu Wenruo u64 orig_disk_bytenr = bio->bi_iter.bi_sector << SECTOR_SHIFT; 3856275193eSQu Wenruo u64 cur_disk_bytenr; 3866275193eSQu Wenruo u8 *csum; 3876275193eSQu Wenruo const unsigned int nblocks = orig_len >> fs_info->sectorsize_bits; 3886275193eSQu Wenruo int count = 0; 3891784b7d5SJosef Bacik blk_status_t ret = BLK_STS_OK; 39061b49440SChris Mason 391056c8311SJosef Bacik if ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) || 392056c8311SJosef Bacik test_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state)) 393334c16d8SJosef Bacik return BLK_STS_OK; 394334c16d8SJosef Bacik 3959e46458aSQu Wenruo /* 3969e46458aSQu Wenruo * This function is only called for read bio. 3979e46458aSQu Wenruo * 3989e46458aSQu Wenruo * This means two things: 3999e46458aSQu Wenruo * - All our csums should only be in csum tree 4009e46458aSQu Wenruo * No ordered extents csums, as ordered extents are only for write 4019e46458aSQu Wenruo * path. 4026275193eSQu Wenruo * - No need to bother any other info from bvec 4036275193eSQu Wenruo * Since we're looking up csums, the only important info is the 4046275193eSQu Wenruo * disk_bytenr and the length, which can be extracted from bi_iter 4056275193eSQu Wenruo * directly. 4069e46458aSQu Wenruo */ 4079e46458aSQu Wenruo ASSERT(bio_op(bio) == REQ_OP_READ); 40861b49440SChris Mason path = btrfs_alloc_path(); 409c2db1073STsutomu Itoh if (!path) 4104e4cbee9SChristoph Hellwig return BLK_STS_RESOURCE; 411facc8a22SMiao Xie 412facc8a22SMiao Xie if (!dst) { 4131784b7d5SJosef Bacik bbio = btrfs_bio(bio); 414fb30f470SOmar Sandoval 415facc8a22SMiao Xie if (nblocks * csum_size > BTRFS_BIO_INLINE_CSUM_SIZE) { 416c3a3b19bSQu Wenruo bbio->csum = kmalloc_array(nblocks, csum_size, GFP_NOFS); 417c3a3b19bSQu Wenruo if (!bbio->csum) { 418facc8a22SMiao Xie btrfs_free_path(path); 4194e4cbee9SChristoph Hellwig return BLK_STS_RESOURCE; 420facc8a22SMiao Xie } 421facc8a22SMiao Xie } else { 422c3a3b19bSQu Wenruo bbio->csum = bbio->csum_inline; 423facc8a22SMiao Xie } 424c3a3b19bSQu Wenruo csum = bbio->csum; 425facc8a22SMiao Xie } else { 42610fe6ca8SJohannes Thumshirn csum = dst; 427facc8a22SMiao Xie } 428facc8a22SMiao Xie 42935478d05SQu Wenruo /* 43035478d05SQu Wenruo * If requested number of sectors is larger than one leaf can contain, 43135478d05SQu Wenruo * kick the readahead for csum tree. 43235478d05SQu Wenruo */ 43335478d05SQu Wenruo if (nblocks > fs_info->csums_per_leaf) 434e4058b54SDavid Sterba path->reada = READA_FORWARD; 43561b49440SChris Mason 4362cf8572dSChris Mason /* 4372cf8572dSChris Mason * the free space stuff is only read when it hasn't been 4382cf8572dSChris Mason * updated in the current transaction. So, we can safely 4392cf8572dSChris Mason * read from the commit root and sidestep a nasty deadlock 4402cf8572dSChris Mason * between reading the free space cache and updating the csum tree. 4412cf8572dSChris Mason */ 44270ddc553SNikolay Borisov if (btrfs_is_free_space_inode(BTRFS_I(inode))) { 4432cf8572dSChris Mason path->search_commit_root = 1; 444ddf23b3fSJosef Bacik path->skip_locking = 1; 445ddf23b3fSJosef Bacik } 4462cf8572dSChris Mason 4476275193eSQu Wenruo for (cur_disk_bytenr = orig_disk_bytenr; 4486275193eSQu Wenruo cur_disk_bytenr < orig_disk_bytenr + orig_len; 4496275193eSQu Wenruo cur_disk_bytenr += (count * sectorsize)) { 4506275193eSQu Wenruo u64 search_len = orig_disk_bytenr + orig_len - cur_disk_bytenr; 4516275193eSQu Wenruo unsigned int sector_offset; 4526275193eSQu Wenruo u8 *csum_dst; 453c40a3d38SChandan Rajendra 4546275193eSQu Wenruo /* 4556275193eSQu Wenruo * Although both cur_disk_bytenr and orig_disk_bytenr is u64, 4566275193eSQu Wenruo * we're calculating the offset to the bio start. 4576275193eSQu Wenruo * 4586275193eSQu Wenruo * Bio size is limited to UINT_MAX, thus unsigned int is large 4596275193eSQu Wenruo * enough to contain the raw result, not to mention the right 4606275193eSQu Wenruo * shifted result. 4616275193eSQu Wenruo */ 4626275193eSQu Wenruo ASSERT(cur_disk_bytenr - orig_disk_bytenr < UINT_MAX); 4636275193eSQu Wenruo sector_offset = (cur_disk_bytenr - orig_disk_bytenr) >> 4646275193eSQu Wenruo fs_info->sectorsize_bits; 4656275193eSQu Wenruo csum_dst = csum + sector_offset * csum_size; 4664989d277SChristoph Hellwig 4676275193eSQu Wenruo count = search_csum_tree(fs_info, path, cur_disk_bytenr, 4686275193eSQu Wenruo search_len, csum_dst); 4691784b7d5SJosef Bacik if (count < 0) { 4701784b7d5SJosef Bacik ret = errno_to_blk_status(count); 4711784b7d5SJosef Bacik if (bbio) 4721784b7d5SJosef Bacik btrfs_bio_free_csum(bbio); 4731784b7d5SJosef Bacik break; 4741784b7d5SJosef Bacik } 4751784b7d5SJosef Bacik 4766275193eSQu Wenruo /* 4771784b7d5SJosef Bacik * We didn't find a csum for this range. We need to make sure 4781784b7d5SJosef Bacik * we complain loudly about this, because we are not NODATASUM. 4791784b7d5SJosef Bacik * 4801784b7d5SJosef Bacik * However for the DATA_RELOC inode we could potentially be 4811784b7d5SJosef Bacik * relocating data extents for a NODATASUM inode, so the inode 4821784b7d5SJosef Bacik * itself won't be marked with NODATASUM, but the extent we're 4831784b7d5SJosef Bacik * copying is in fact NODATASUM. If we don't find a csum we 4841784b7d5SJosef Bacik * assume this is the case. 4856275193eSQu Wenruo */ 4861784b7d5SJosef Bacik if (count == 0) { 4876275193eSQu Wenruo memset(csum_dst, 0, csum_size); 488e4100d98SMiao Xie count = 1; 4896275193eSQu Wenruo 49017d217feSYan Zheng if (BTRFS_I(inode)->root->root_key.objectid == 49117d217feSYan Zheng BTRFS_DATA_RELOC_TREE_OBJECTID) { 4926275193eSQu Wenruo u64 file_offset; 4936275193eSQu Wenruo int ret; 4946275193eSQu Wenruo 4956275193eSQu Wenruo ret = search_file_offset_in_bio(bio, inode, 4966275193eSQu Wenruo cur_disk_bytenr, &file_offset); 4976275193eSQu Wenruo if (ret) 4986275193eSQu Wenruo set_extent_bits(io_tree, file_offset, 4996275193eSQu Wenruo file_offset + sectorsize - 1, 500ceeb0ae7SDavid Sterba EXTENT_NODATASUM); 50117d217feSYan Zheng } else { 5026275193eSQu Wenruo btrfs_warn_rl(fs_info, 5036275193eSQu Wenruo "csum hole found for disk bytenr range [%llu, %llu)", 5046275193eSQu Wenruo cur_disk_bytenr, cur_disk_bytenr + sectorsize); 50517d217feSYan Zheng } 5064989d277SChristoph Hellwig } 5074989d277SChristoph Hellwig } 5084989d277SChristoph Hellwig 50961b49440SChris Mason btrfs_free_path(path); 5101784b7d5SJosef Bacik return ret; 5114b46fce2SJosef Bacik } 5124b46fce2SJosef Bacik 51317d217feSYan Zheng int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, 514*26ce9114SJosef Bacik struct list_head *list, int search_commit, 515*26ce9114SJosef Bacik bool nowait) 51617d217feSYan Zheng { 5170b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 51817d217feSYan Zheng struct btrfs_key key; 51917d217feSYan Zheng struct btrfs_path *path; 52017d217feSYan Zheng struct extent_buffer *leaf; 52117d217feSYan Zheng struct btrfs_ordered_sum *sums; 52217d217feSYan Zheng struct btrfs_csum_item *item; 5230678b618SMark Fasheh LIST_HEAD(tmplist); 52417d217feSYan Zheng unsigned long offset; 52517d217feSYan Zheng int ret; 52617d217feSYan Zheng size_t size; 52717d217feSYan Zheng u64 csum_end; 528223486c2SDavid Sterba const u32 csum_size = fs_info->csum_size; 52917d217feSYan Zheng 5300b246afaSJeff Mahoney ASSERT(IS_ALIGNED(start, fs_info->sectorsize) && 5310b246afaSJeff Mahoney IS_ALIGNED(end + 1, fs_info->sectorsize)); 5324277a9c3SJosef Bacik 53317d217feSYan Zheng path = btrfs_alloc_path(); 534d8926bb3SMark Fasheh if (!path) 535d8926bb3SMark Fasheh return -ENOMEM; 53617d217feSYan Zheng 537*26ce9114SJosef Bacik path->nowait = nowait; 538a2de733cSArne Jansen if (search_commit) { 539a2de733cSArne Jansen path->skip_locking = 1; 540e4058b54SDavid Sterba path->reada = READA_FORWARD; 541a2de733cSArne Jansen path->search_commit_root = 1; 542a2de733cSArne Jansen } 543a2de733cSArne Jansen 54417d217feSYan Zheng key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; 54517d217feSYan Zheng key.offset = start; 54617d217feSYan Zheng key.type = BTRFS_EXTENT_CSUM_KEY; 54717d217feSYan Zheng 54807d400a6SYan Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 54917d217feSYan Zheng if (ret < 0) 55017d217feSYan Zheng goto fail; 55117d217feSYan Zheng if (ret > 0 && path->slots[0] > 0) { 55217d217feSYan Zheng leaf = path->nodes[0]; 55317d217feSYan Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1); 55417d217feSYan Zheng if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID && 55517d217feSYan Zheng key.type == BTRFS_EXTENT_CSUM_KEY) { 556265fdfa6SDavid Sterba offset = (start - key.offset) >> fs_info->sectorsize_bits; 55717d217feSYan Zheng if (offset * csum_size < 5583212fa14SJosef Bacik btrfs_item_size(leaf, path->slots[0] - 1)) 55917d217feSYan Zheng path->slots[0]--; 56017d217feSYan Zheng } 56117d217feSYan Zheng } 56217d217feSYan Zheng 56317d217feSYan Zheng while (start <= end) { 56417d217feSYan Zheng leaf = path->nodes[0]; 56517d217feSYan Zheng if (path->slots[0] >= btrfs_header_nritems(leaf)) { 56607d400a6SYan Zheng ret = btrfs_next_leaf(root, path); 56717d217feSYan Zheng if (ret < 0) 56817d217feSYan Zheng goto fail; 56917d217feSYan Zheng if (ret > 0) 57017d217feSYan Zheng break; 57117d217feSYan Zheng leaf = path->nodes[0]; 57217d217feSYan Zheng } 57317d217feSYan Zheng 57417d217feSYan Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 57517d217feSYan Zheng if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || 576628c8282SZhi Yong Wu key.type != BTRFS_EXTENT_CSUM_KEY || 577628c8282SZhi Yong Wu key.offset > end) 57817d217feSYan Zheng break; 57917d217feSYan Zheng 58017d217feSYan Zheng if (key.offset > start) 58117d217feSYan Zheng start = key.offset; 58217d217feSYan Zheng 5833212fa14SJosef Bacik size = btrfs_item_size(leaf, path->slots[0]); 5840b246afaSJeff Mahoney csum_end = key.offset + (size / csum_size) * fs_info->sectorsize; 58587b29b20SYan Zheng if (csum_end <= start) { 58687b29b20SYan Zheng path->slots[0]++; 58787b29b20SYan Zheng continue; 58887b29b20SYan Zheng } 58917d217feSYan Zheng 59007d400a6SYan Zheng csum_end = min(csum_end, end + 1); 59107d400a6SYan Zheng item = btrfs_item_ptr(path->nodes[0], path->slots[0], 59207d400a6SYan Zheng struct btrfs_csum_item); 59307d400a6SYan Zheng while (start < csum_end) { 59407d400a6SYan Zheng size = min_t(size_t, csum_end - start, 5951e25a2e3SJohannes Thumshirn max_ordered_sum_bytes(fs_info, csum_size)); 5960b246afaSJeff Mahoney sums = kzalloc(btrfs_ordered_sum_size(fs_info, size), 59707d400a6SYan Zheng GFP_NOFS); 5980678b618SMark Fasheh if (!sums) { 5990678b618SMark Fasheh ret = -ENOMEM; 6000678b618SMark Fasheh goto fail; 6010678b618SMark Fasheh } 60217d217feSYan Zheng 60317d217feSYan Zheng sums->bytenr = start; 604f51a4a18SMiao Xie sums->len = (int)size; 60517d217feSYan Zheng 606265fdfa6SDavid Sterba offset = (start - key.offset) >> fs_info->sectorsize_bits; 60717d217feSYan Zheng offset *= csum_size; 608265fdfa6SDavid Sterba size >>= fs_info->sectorsize_bits; 60917d217feSYan Zheng 61007d400a6SYan Zheng read_extent_buffer(path->nodes[0], 611f51a4a18SMiao Xie sums->sums, 612f51a4a18SMiao Xie ((unsigned long)item) + offset, 613f51a4a18SMiao Xie csum_size * size); 61417d217feSYan Zheng 6150b246afaSJeff Mahoney start += fs_info->sectorsize * size; 6160678b618SMark Fasheh list_add_tail(&sums->list, &tmplist); 61707d400a6SYan Zheng } 61817d217feSYan Zheng path->slots[0]++; 61917d217feSYan Zheng } 62017d217feSYan Zheng ret = 0; 62117d217feSYan Zheng fail: 6220678b618SMark Fasheh while (ret < 0 && !list_empty(&tmplist)) { 6236e5aafb2SChris Mason sums = list_entry(tmplist.next, struct btrfs_ordered_sum, list); 6240678b618SMark Fasheh list_del(&sums->list); 6250678b618SMark Fasheh kfree(sums); 6260678b618SMark Fasheh } 6270678b618SMark Fasheh list_splice_tail(&tmplist, list); 6280678b618SMark Fasheh 62917d217feSYan Zheng btrfs_free_path(path); 63017d217feSYan Zheng return ret; 63117d217feSYan Zheng } 63217d217feSYan Zheng 633e331f6b1SOmar Sandoval /** 634e331f6b1SOmar Sandoval * Calculate checksums of the data contained inside a bio 635e331f6b1SOmar Sandoval * 63651d470aeSNikolay Borisov * @inode: Owner of the data inside the bio 63751d470aeSNikolay Borisov * @bio: Contains the data to be checksummed 638e331f6b1SOmar Sandoval * @offset: If (u64)-1, @bio may contain discontiguous bio vecs, so the 639e331f6b1SOmar Sandoval * file offsets are determined from the page offsets in the bio. 640e331f6b1SOmar Sandoval * Otherwise, this is the starting file offset of the bio vecs in 641e331f6b1SOmar Sandoval * @bio, which must be contiguous. 642e331f6b1SOmar Sandoval * @one_ordered: If true, @bio only refers to one ordered extent. 64351d470aeSNikolay Borisov */ 644bd242a08SNikolay Borisov blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio, 645e331f6b1SOmar Sandoval u64 offset, bool one_ordered) 646e015640fSChris Mason { 647c3504372SNikolay Borisov struct btrfs_fs_info *fs_info = inode->root->fs_info; 648d5178578SJohannes Thumshirn SHASH_DESC_ON_STACK(shash, fs_info->csum_shash); 649e6dcd2dcSChris Mason struct btrfs_ordered_sum *sums; 6506cd7ce49SChristoph Hellwig struct btrfs_ordered_extent *ordered = NULL; 651e331f6b1SOmar Sandoval const bool use_page_offsets = (offset == (u64)-1); 652e015640fSChris Mason char *data; 65317347cecSLiu Bo struct bvec_iter iter; 65417347cecSLiu Bo struct bio_vec bvec; 655f51a4a18SMiao Xie int index; 656e331f6b1SOmar Sandoval unsigned int blockcount; 6573edf7d33SChris Mason unsigned long total_bytes = 0; 6583edf7d33SChris Mason unsigned long this_sum_bytes = 0; 65917347cecSLiu Bo int i; 660a3d46aeaSNikolay Borisov unsigned nofs_flag; 661e015640fSChris Mason 662a3d46aeaSNikolay Borisov nofs_flag = memalloc_nofs_save(); 663a3d46aeaSNikolay Borisov sums = kvzalloc(btrfs_ordered_sum_size(fs_info, bio->bi_iter.bi_size), 664a3d46aeaSNikolay Borisov GFP_KERNEL); 665a3d46aeaSNikolay Borisov memalloc_nofs_restore(nofs_flag); 666a3d46aeaSNikolay Borisov 667e015640fSChris Mason if (!sums) 6684e4cbee9SChristoph Hellwig return BLK_STS_RESOURCE; 6693edf7d33SChris Mason 6704f024f37SKent Overstreet sums->len = bio->bi_iter.bi_size; 671e6dcd2dcSChris Mason INIT_LIST_HEAD(&sums->list); 672d20f7043SChris Mason 6731201b58bSDavid Sterba sums->bytenr = bio->bi_iter.bi_sector << 9; 674f51a4a18SMiao Xie index = 0; 675e015640fSChris Mason 676d5178578SJohannes Thumshirn shash->tfm = fs_info->csum_shash; 677d5178578SJohannes Thumshirn 67817347cecSLiu Bo bio_for_each_segment(bvec, bio, iter) { 679e331f6b1SOmar Sandoval if (use_page_offsets) 68017347cecSLiu Bo offset = page_offset(bvec.bv_page) + bvec.bv_offset; 681d20f7043SChris Mason 6826cd7ce49SChristoph Hellwig if (!ordered) { 6836cd7ce49SChristoph Hellwig ordered = btrfs_lookup_ordered_extent(inode, offset); 684bbc9a6ebSQu Wenruo /* 685bbc9a6ebSQu Wenruo * The bio range is not covered by any ordered extent, 686bbc9a6ebSQu Wenruo * must be a code logic error. 687bbc9a6ebSQu Wenruo */ 688bbc9a6ebSQu Wenruo if (unlikely(!ordered)) { 689bbc9a6ebSQu Wenruo WARN(1, KERN_WARNING 690bbc9a6ebSQu Wenruo "no ordered extent for root %llu ino %llu offset %llu\n", 691bbc9a6ebSQu Wenruo inode->root->root_key.objectid, 692bbc9a6ebSQu Wenruo btrfs_ino(inode), offset); 693bbc9a6ebSQu Wenruo kvfree(sums); 694bbc9a6ebSQu Wenruo return BLK_STS_IOERR; 695bbc9a6ebSQu Wenruo } 6966cd7ce49SChristoph Hellwig } 6976cd7ce49SChristoph Hellwig 698e331f6b1SOmar Sandoval blockcount = BTRFS_BYTES_TO_BLKS(fs_info, 69917347cecSLiu Bo bvec.bv_len + fs_info->sectorsize 700c40a3d38SChandan Rajendra - 1); 701c40a3d38SChandan Rajendra 702e331f6b1SOmar Sandoval for (i = 0; i < blockcount; i++) { 703e331f6b1SOmar Sandoval if (!one_ordered && 704e331f6b1SOmar Sandoval !in_range(offset, ordered->file_offset, 705e331f6b1SOmar Sandoval ordered->num_bytes)) { 7063edf7d33SChris Mason unsigned long bytes_left; 707c40a3d38SChandan Rajendra 7083edf7d33SChris Mason sums->len = this_sum_bytes; 7093edf7d33SChris Mason this_sum_bytes = 0; 710f9756261SNikolay Borisov btrfs_add_ordered_sum(ordered, sums); 7113edf7d33SChris Mason btrfs_put_ordered_extent(ordered); 7123edf7d33SChris Mason 7134f024f37SKent Overstreet bytes_left = bio->bi_iter.bi_size - total_bytes; 7143edf7d33SChris Mason 715a3d46aeaSNikolay Borisov nofs_flag = memalloc_nofs_save(); 716a3d46aeaSNikolay Borisov sums = kvzalloc(btrfs_ordered_sum_size(fs_info, 717a3d46aeaSNikolay Borisov bytes_left), GFP_KERNEL); 718a3d46aeaSNikolay Borisov memalloc_nofs_restore(nofs_flag); 71979787eaaSJeff Mahoney BUG_ON(!sums); /* -ENOMEM */ 7203edf7d33SChris Mason sums->len = bytes_left; 721c40a3d38SChandan Rajendra ordered = btrfs_lookup_ordered_extent(inode, 722c40a3d38SChandan Rajendra offset); 723c40a3d38SChandan Rajendra ASSERT(ordered); /* Logic error */ 7241201b58bSDavid Sterba sums->bytenr = (bio->bi_iter.bi_sector << 9) 725c40a3d38SChandan Rajendra + total_bytes; 726f51a4a18SMiao Xie index = 0; 727c40a3d38SChandan Rajendra } 728c40a3d38SChandan Rajendra 7293dcfbcceSChristoph Hellwig data = bvec_kmap_local(&bvec); 7303dcfbcceSChristoph Hellwig crypto_shash_digest(shash, 7313dcfbcceSChristoph Hellwig data + (i * fs_info->sectorsize), 732fd08001fSEric Biggers fs_info->sectorsize, 733fd08001fSEric Biggers sums->sums + index); 7343dcfbcceSChristoph Hellwig kunmap_local(data); 735713cebfbSDavid Sterba index += fs_info->csum_size; 7360b246afaSJeff Mahoney offset += fs_info->sectorsize; 7370b246afaSJeff Mahoney this_sum_bytes += fs_info->sectorsize; 7380b246afaSJeff Mahoney total_bytes += fs_info->sectorsize; 739c40a3d38SChandan Rajendra } 740c40a3d38SChandan Rajendra 741e015640fSChris Mason } 742ed98b56aSChris Mason this_sum_bytes = 0; 743f9756261SNikolay Borisov btrfs_add_ordered_sum(ordered, sums); 7443edf7d33SChris Mason btrfs_put_ordered_extent(ordered); 745e015640fSChris Mason return 0; 746e015640fSChris Mason } 747e015640fSChris Mason 748459931ecSChris Mason /* 749459931ecSChris Mason * helper function for csum removal, this expects the 750459931ecSChris Mason * key to describe the csum pointed to by the path, and it expects 751459931ecSChris Mason * the csum to overlap the range [bytenr, len] 752459931ecSChris Mason * 753459931ecSChris Mason * The csum should not be entirely contained in the range and the 754459931ecSChris Mason * range should not be entirely contained in the csum. 755459931ecSChris Mason * 756459931ecSChris Mason * This calls btrfs_truncate_item with the correct args based on the 757459931ecSChris Mason * overlap, and fixes up the key as required. 758459931ecSChris Mason */ 7592ff7e61eSJeff Mahoney static noinline void truncate_one_csum(struct btrfs_fs_info *fs_info, 760459931ecSChris Mason struct btrfs_path *path, 761459931ecSChris Mason struct btrfs_key *key, 762459931ecSChris Mason u64 bytenr, u64 len) 763459931ecSChris Mason { 764459931ecSChris Mason struct extent_buffer *leaf; 765223486c2SDavid Sterba const u32 csum_size = fs_info->csum_size; 766459931ecSChris Mason u64 csum_end; 767459931ecSChris Mason u64 end_byte = bytenr + len; 768265fdfa6SDavid Sterba u32 blocksize_bits = fs_info->sectorsize_bits; 769459931ecSChris Mason 770459931ecSChris Mason leaf = path->nodes[0]; 7713212fa14SJosef Bacik csum_end = btrfs_item_size(leaf, path->slots[0]) / csum_size; 772265fdfa6SDavid Sterba csum_end <<= blocksize_bits; 773459931ecSChris Mason csum_end += key->offset; 774459931ecSChris Mason 775459931ecSChris Mason if (key->offset < bytenr && csum_end <= end_byte) { 776459931ecSChris Mason /* 777459931ecSChris Mason * [ bytenr - len ] 778459931ecSChris Mason * [ ] 779459931ecSChris Mason * [csum ] 780459931ecSChris Mason * A simple truncate off the end of the item 781459931ecSChris Mason */ 782459931ecSChris Mason u32 new_size = (bytenr - key->offset) >> blocksize_bits; 783459931ecSChris Mason new_size *= csum_size; 78478ac4f9eSDavid Sterba btrfs_truncate_item(path, new_size, 1); 785459931ecSChris Mason } else if (key->offset >= bytenr && csum_end > end_byte && 786459931ecSChris Mason end_byte > key->offset) { 787459931ecSChris Mason /* 788459931ecSChris Mason * [ bytenr - len ] 789459931ecSChris Mason * [ ] 790459931ecSChris Mason * [csum ] 791459931ecSChris Mason * we need to truncate from the beginning of the csum 792459931ecSChris Mason */ 793459931ecSChris Mason u32 new_size = (csum_end - end_byte) >> blocksize_bits; 794459931ecSChris Mason new_size *= csum_size; 795459931ecSChris Mason 79678ac4f9eSDavid Sterba btrfs_truncate_item(path, new_size, 0); 797459931ecSChris Mason 798459931ecSChris Mason key->offset = end_byte; 7990b246afaSJeff Mahoney btrfs_set_item_key_safe(fs_info, path, key); 800459931ecSChris Mason } else { 801459931ecSChris Mason BUG(); 802459931ecSChris Mason } 803459931ecSChris Mason } 804459931ecSChris Mason 805459931ecSChris Mason /* 806459931ecSChris Mason * deletes the csum items from the csum tree for a given 807459931ecSChris Mason * range of bytes. 808459931ecSChris Mason */ 809459931ecSChris Mason int btrfs_del_csums(struct btrfs_trans_handle *trans, 81040e046acSFilipe Manana struct btrfs_root *root, u64 bytenr, u64 len) 811459931ecSChris Mason { 81240e046acSFilipe Manana struct btrfs_fs_info *fs_info = trans->fs_info; 813459931ecSChris Mason struct btrfs_path *path; 814459931ecSChris Mason struct btrfs_key key; 815459931ecSChris Mason u64 end_byte = bytenr + len; 816459931ecSChris Mason u64 csum_end; 817459931ecSChris Mason struct extent_buffer *leaf; 818b86652beSJosef Bacik int ret = 0; 819223486c2SDavid Sterba const u32 csum_size = fs_info->csum_size; 820265fdfa6SDavid Sterba u32 blocksize_bits = fs_info->sectorsize_bits; 821459931ecSChris Mason 82284d2d6c7SJosef Bacik ASSERT(root->root_key.objectid == BTRFS_CSUM_TREE_OBJECTID || 82340e046acSFilipe Manana root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID); 82440e046acSFilipe Manana 825459931ecSChris Mason path = btrfs_alloc_path(); 8262a29edc6Sliubo if (!path) 8272a29edc6Sliubo return -ENOMEM; 828459931ecSChris Mason 829459931ecSChris Mason while (1) { 830459931ecSChris Mason key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; 831459931ecSChris Mason key.offset = end_byte - 1; 832459931ecSChris Mason key.type = BTRFS_EXTENT_CSUM_KEY; 833459931ecSChris Mason 834459931ecSChris Mason ret = btrfs_search_slot(trans, root, &key, path, -1, 1); 835459931ecSChris Mason if (ret > 0) { 836b86652beSJosef Bacik ret = 0; 837459931ecSChris Mason if (path->slots[0] == 0) 83865a246c5STsutomu Itoh break; 839459931ecSChris Mason path->slots[0]--; 840ad0397a7SJosef Bacik } else if (ret < 0) { 84165a246c5STsutomu Itoh break; 842459931ecSChris Mason } 843ad0397a7SJosef Bacik 844459931ecSChris Mason leaf = path->nodes[0]; 845459931ecSChris Mason btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 846459931ecSChris Mason 847459931ecSChris Mason if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || 848459931ecSChris Mason key.type != BTRFS_EXTENT_CSUM_KEY) { 849459931ecSChris Mason break; 850459931ecSChris Mason } 851459931ecSChris Mason 852459931ecSChris Mason if (key.offset >= end_byte) 853459931ecSChris Mason break; 854459931ecSChris Mason 8553212fa14SJosef Bacik csum_end = btrfs_item_size(leaf, path->slots[0]) / csum_size; 856459931ecSChris Mason csum_end <<= blocksize_bits; 857459931ecSChris Mason csum_end += key.offset; 858459931ecSChris Mason 859459931ecSChris Mason /* this csum ends before we start, we're done */ 860459931ecSChris Mason if (csum_end <= bytenr) 861459931ecSChris Mason break; 862459931ecSChris Mason 863459931ecSChris Mason /* delete the entire item, it is inside our range */ 864459931ecSChris Mason if (key.offset >= bytenr && csum_end <= end_byte) { 8656f546216SFilipe Manana int del_nr = 1; 8666f546216SFilipe Manana 8676f546216SFilipe Manana /* 8686f546216SFilipe Manana * Check how many csum items preceding this one in this 8696f546216SFilipe Manana * leaf correspond to our range and then delete them all 8706f546216SFilipe Manana * at once. 8716f546216SFilipe Manana */ 8726f546216SFilipe Manana if (key.offset > bytenr && path->slots[0] > 0) { 8736f546216SFilipe Manana int slot = path->slots[0] - 1; 8746f546216SFilipe Manana 8756f546216SFilipe Manana while (slot >= 0) { 8766f546216SFilipe Manana struct btrfs_key pk; 8776f546216SFilipe Manana 8786f546216SFilipe Manana btrfs_item_key_to_cpu(leaf, &pk, slot); 8796f546216SFilipe Manana if (pk.offset < bytenr || 8806f546216SFilipe Manana pk.type != BTRFS_EXTENT_CSUM_KEY || 8816f546216SFilipe Manana pk.objectid != 8826f546216SFilipe Manana BTRFS_EXTENT_CSUM_OBJECTID) 8836f546216SFilipe Manana break; 8846f546216SFilipe Manana path->slots[0] = slot; 8856f546216SFilipe Manana del_nr++; 8866f546216SFilipe Manana key.offset = pk.offset; 8876f546216SFilipe Manana slot--; 8886f546216SFilipe Manana } 8896f546216SFilipe Manana } 8906f546216SFilipe Manana ret = btrfs_del_items(trans, root, path, 8916f546216SFilipe Manana path->slots[0], del_nr); 89265a246c5STsutomu Itoh if (ret) 893b86652beSJosef Bacik break; 894dcbdd4dcSChris Mason if (key.offset == bytenr) 895dcbdd4dcSChris Mason break; 896459931ecSChris Mason } else if (key.offset < bytenr && csum_end > end_byte) { 897459931ecSChris Mason unsigned long offset; 898459931ecSChris Mason unsigned long shift_len; 899459931ecSChris Mason unsigned long item_offset; 900459931ecSChris Mason /* 901459931ecSChris Mason * [ bytenr - len ] 902459931ecSChris Mason * [csum ] 903459931ecSChris Mason * 904459931ecSChris Mason * Our bytes are in the middle of the csum, 905459931ecSChris Mason * we need to split this item and insert a new one. 906459931ecSChris Mason * 907459931ecSChris Mason * But we can't drop the path because the 908459931ecSChris Mason * csum could change, get removed, extended etc. 909459931ecSChris Mason * 910459931ecSChris Mason * The trick here is the max size of a csum item leaves 911459931ecSChris Mason * enough room in the tree block for a single 912459931ecSChris Mason * item header. So, we split the item in place, 913459931ecSChris Mason * adding a new header pointing to the existing 914459931ecSChris Mason * bytes. Then we loop around again and we have 915459931ecSChris Mason * a nicely formed csum item that we can neatly 916459931ecSChris Mason * truncate. 917459931ecSChris Mason */ 918459931ecSChris Mason offset = (bytenr - key.offset) >> blocksize_bits; 919459931ecSChris Mason offset *= csum_size; 920459931ecSChris Mason 921459931ecSChris Mason shift_len = (len >> blocksize_bits) * csum_size; 922459931ecSChris Mason 923459931ecSChris Mason item_offset = btrfs_item_ptr_offset(leaf, 924459931ecSChris Mason path->slots[0]); 925459931ecSChris Mason 926b159fa28SDavid Sterba memzero_extent_buffer(leaf, item_offset + offset, 927459931ecSChris Mason shift_len); 928459931ecSChris Mason key.offset = bytenr; 929459931ecSChris Mason 930459931ecSChris Mason /* 931459931ecSChris Mason * btrfs_split_item returns -EAGAIN when the 932459931ecSChris Mason * item changed size or key 933459931ecSChris Mason */ 934459931ecSChris Mason ret = btrfs_split_item(trans, root, path, &key, offset); 93579787eaaSJeff Mahoney if (ret && ret != -EAGAIN) { 93666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 937b86652beSJosef Bacik break; 93879787eaaSJeff Mahoney } 939b86652beSJosef Bacik ret = 0; 940459931ecSChris Mason 941459931ecSChris Mason key.offset = end_byte - 1; 942459931ecSChris Mason } else { 9432ff7e61eSJeff Mahoney truncate_one_csum(fs_info, path, &key, bytenr, len); 944dcbdd4dcSChris Mason if (key.offset < bytenr) 945dcbdd4dcSChris Mason break; 946459931ecSChris Mason } 947b3b4aa74SDavid Sterba btrfs_release_path(path); 948459931ecSChris Mason } 949459931ecSChris Mason btrfs_free_path(path); 95065a246c5STsutomu Itoh return ret; 951459931ecSChris Mason } 952459931ecSChris Mason 953ea7036deSFilipe Manana static int find_next_csum_offset(struct btrfs_root *root, 954ea7036deSFilipe Manana struct btrfs_path *path, 955ea7036deSFilipe Manana u64 *next_offset) 956ea7036deSFilipe Manana { 957ea7036deSFilipe Manana const u32 nritems = btrfs_header_nritems(path->nodes[0]); 958ea7036deSFilipe Manana struct btrfs_key found_key; 959ea7036deSFilipe Manana int slot = path->slots[0] + 1; 960ea7036deSFilipe Manana int ret; 961ea7036deSFilipe Manana 962ea7036deSFilipe Manana if (nritems == 0 || slot >= nritems) { 963ea7036deSFilipe Manana ret = btrfs_next_leaf(root, path); 964ea7036deSFilipe Manana if (ret < 0) { 965ea7036deSFilipe Manana return ret; 966ea7036deSFilipe Manana } else if (ret > 0) { 967ea7036deSFilipe Manana *next_offset = (u64)-1; 968ea7036deSFilipe Manana return 0; 969ea7036deSFilipe Manana } 970ea7036deSFilipe Manana slot = path->slots[0]; 971ea7036deSFilipe Manana } 972ea7036deSFilipe Manana 973ea7036deSFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot); 974ea7036deSFilipe Manana 975ea7036deSFilipe Manana if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || 976ea7036deSFilipe Manana found_key.type != BTRFS_EXTENT_CSUM_KEY) 977ea7036deSFilipe Manana *next_offset = (u64)-1; 978ea7036deSFilipe Manana else 979ea7036deSFilipe Manana *next_offset = found_key.offset; 980ea7036deSFilipe Manana 981ea7036deSFilipe Manana return 0; 982ea7036deSFilipe Manana } 983ea7036deSFilipe Manana 984065631f6SChris Mason int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, 985d20f7043SChris Mason struct btrfs_root *root, 986e6dcd2dcSChris Mason struct btrfs_ordered_sum *sums) 987f254e52cSChris Mason { 9880b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 989f254e52cSChris Mason struct btrfs_key file_key; 9906567e837SChris Mason struct btrfs_key found_key; 9915caf2a00SChris Mason struct btrfs_path *path; 992f254e52cSChris Mason struct btrfs_csum_item *item; 993065631f6SChris Mason struct btrfs_csum_item *item_end; 994ff79f819SChris Mason struct extent_buffer *leaf = NULL; 995f51a4a18SMiao Xie u64 next_offset; 996f51a4a18SMiao Xie u64 total_bytes = 0; 9976567e837SChris Mason u64 csum_offset; 998f51a4a18SMiao Xie u64 bytenr; 999f578d4bdSChris Mason u32 ins_size; 1000f51a4a18SMiao Xie int index = 0; 1001f51a4a18SMiao Xie int found_next; 1002f51a4a18SMiao Xie int ret; 1003223486c2SDavid Sterba const u32 csum_size = fs_info->csum_size; 10046e92f5e6SChris Mason 10055caf2a00SChris Mason path = btrfs_alloc_path(); 1006d8926bb3SMark Fasheh if (!path) 1007d8926bb3SMark Fasheh return -ENOMEM; 1008065631f6SChris Mason again: 1009065631f6SChris Mason next_offset = (u64)-1; 1010065631f6SChris Mason found_next = 0; 1011f51a4a18SMiao Xie bytenr = sums->bytenr + total_bytes; 1012d20f7043SChris Mason file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; 1013f51a4a18SMiao Xie file_key.offset = bytenr; 1014962a298fSDavid Sterba file_key.type = BTRFS_EXTENT_CSUM_KEY; 1015a429e513SChris Mason 1016f51a4a18SMiao Xie item = btrfs_lookup_csum(trans, root, path, bytenr, 1); 1017ff79f819SChris Mason if (!IS_ERR(item)) { 1018639cb586SChris Mason ret = 0; 1019f51a4a18SMiao Xie leaf = path->nodes[0]; 1020f51a4a18SMiao Xie item_end = btrfs_item_ptr(leaf, path->slots[0], 1021f51a4a18SMiao Xie struct btrfs_csum_item); 1022f51a4a18SMiao Xie item_end = (struct btrfs_csum_item *)((char *)item_end + 10233212fa14SJosef Bacik btrfs_item_size(leaf, path->slots[0])); 1024a429e513SChris Mason goto found; 1025ff79f819SChris Mason } 1026a429e513SChris Mason ret = PTR_ERR(item); 10274a500fd1SYan, Zheng if (ret != -EFBIG && ret != -ENOENT) 1028918cdf44SFilipe Manana goto out; 10294a500fd1SYan, Zheng 1030a429e513SChris Mason if (ret == -EFBIG) { 1031a429e513SChris Mason u32 item_size; 1032a429e513SChris Mason /* we found one, but it isn't big enough yet */ 10335f39d397SChris Mason leaf = path->nodes[0]; 10343212fa14SJosef Bacik item_size = btrfs_item_size(leaf, path->slots[0]); 1035607d432dSJosef Bacik if ((item_size / csum_size) >= 10360b246afaSJeff Mahoney MAX_CSUM_ITEMS(fs_info, csum_size)) { 1037a429e513SChris Mason /* already at max size, make a new one */ 1038a429e513SChris Mason goto insert; 1039a429e513SChris Mason } 1040a429e513SChris Mason } else { 1041ea7036deSFilipe Manana /* We didn't find a csum item, insert one. */ 1042ea7036deSFilipe Manana ret = find_next_csum_offset(root, path, &next_offset); 1043ea7036deSFilipe Manana if (ret < 0) 10447e4a3f7eSFilipe Manana goto out; 1045f578d4bdSChris Mason found_next = 1; 1046a429e513SChris Mason goto insert; 1047a429e513SChris Mason } 1048a429e513SChris Mason 1049a429e513SChris Mason /* 1050cc14600cSFilipe Manana * At this point, we know the tree has a checksum item that ends at an 1051cc14600cSFilipe Manana * offset matching the start of the checksum range we want to insert. 1052cc14600cSFilipe Manana * We try to extend that item as much as possible and then add as many 1053cc14600cSFilipe Manana * checksums to it as they fit. 1054cc14600cSFilipe Manana * 1055cc14600cSFilipe Manana * First check if the leaf has enough free space for at least one 1056cc14600cSFilipe Manana * checksum. If it has go directly to the item extension code, otherwise 1057cc14600cSFilipe Manana * release the path and do a search for insertion before the extension. 1058a429e513SChris Mason */ 1059cc14600cSFilipe Manana if (btrfs_leaf_free_space(leaf) >= csum_size) { 1060cc14600cSFilipe Manana btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); 1061cc14600cSFilipe Manana csum_offset = (bytenr - found_key.offset) >> 1062265fdfa6SDavid Sterba fs_info->sectorsize_bits; 1063cc14600cSFilipe Manana goto extend_csum; 1064cc14600cSFilipe Manana } 1065cc14600cSFilipe Manana 1066b3b4aa74SDavid Sterba btrfs_release_path(path); 10679a664971Sethanwu path->search_for_extension = 1; 10686567e837SChris Mason ret = btrfs_search_slot(trans, root, &file_key, path, 1069607d432dSJosef Bacik csum_size, 1); 10709a664971Sethanwu path->search_for_extension = 0; 10716567e837SChris Mason if (ret < 0) 1072918cdf44SFilipe Manana goto out; 1073459931ecSChris Mason 1074459931ecSChris Mason if (ret > 0) { 1075459931ecSChris Mason if (path->slots[0] == 0) 10766567e837SChris Mason goto insert; 10776567e837SChris Mason path->slots[0]--; 1078459931ecSChris Mason } 1079459931ecSChris Mason 10805f39d397SChris Mason leaf = path->nodes[0]; 10815f39d397SChris Mason btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); 1082265fdfa6SDavid Sterba csum_offset = (bytenr - found_key.offset) >> fs_info->sectorsize_bits; 1083459931ecSChris Mason 1084962a298fSDavid Sterba if (found_key.type != BTRFS_EXTENT_CSUM_KEY || 1085d20f7043SChris Mason found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || 10860b246afaSJeff Mahoney csum_offset >= MAX_CSUM_ITEMS(fs_info, csum_size)) { 10876567e837SChris Mason goto insert; 10886567e837SChris Mason } 1089459931ecSChris Mason 1090cc14600cSFilipe Manana extend_csum: 10913212fa14SJosef Bacik if (csum_offset == btrfs_item_size(leaf, path->slots[0]) / 1092607d432dSJosef Bacik csum_size) { 10932f697dc6SLiu Bo int extend_nr; 10942f697dc6SLiu Bo u64 tmp; 10952f697dc6SLiu Bo u32 diff; 1096459931ecSChris Mason 1097f51a4a18SMiao Xie tmp = sums->len - total_bytes; 1098265fdfa6SDavid Sterba tmp >>= fs_info->sectorsize_bits; 10992f697dc6SLiu Bo WARN_ON(tmp < 1); 1100ea7036deSFilipe Manana extend_nr = max_t(int, 1, tmp); 11012f697dc6SLiu Bo 1102ea7036deSFilipe Manana /* 1103ea7036deSFilipe Manana * A log tree can already have checksum items with a subset of 1104ea7036deSFilipe Manana * the checksums we are trying to log. This can happen after 1105ea7036deSFilipe Manana * doing a sequence of partial writes into prealloc extents and 1106ea7036deSFilipe Manana * fsyncs in between, with a full fsync logging a larger subrange 1107ea7036deSFilipe Manana * of an extent for which a previous fast fsync logged a smaller 1108ea7036deSFilipe Manana * subrange. And this happens in particular due to merging file 1109ea7036deSFilipe Manana * extent items when we complete an ordered extent for a range 1110ea7036deSFilipe Manana * covered by a prealloc extent - this is done at 1111ea7036deSFilipe Manana * btrfs_mark_extent_written(). 1112ea7036deSFilipe Manana * 1113ea7036deSFilipe Manana * So if we try to extend the previous checksum item, which has 1114ea7036deSFilipe Manana * a range that ends at the start of the range we want to insert, 1115ea7036deSFilipe Manana * make sure we don't extend beyond the start offset of the next 1116ea7036deSFilipe Manana * checksum item. If we are at the last item in the leaf, then 1117ea7036deSFilipe Manana * forget the optimization of extending and add a new checksum 1118ea7036deSFilipe Manana * item - it is not worth the complexity of releasing the path, 1119ea7036deSFilipe Manana * getting the first key for the next leaf, repeat the btree 1120ea7036deSFilipe Manana * search, etc, because log trees are temporary anyway and it 1121ea7036deSFilipe Manana * would only save a few bytes of leaf space. 1122ea7036deSFilipe Manana */ 1123ea7036deSFilipe Manana if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { 1124ea7036deSFilipe Manana if (path->slots[0] + 1 >= 1125ea7036deSFilipe Manana btrfs_header_nritems(path->nodes[0])) { 1126ea7036deSFilipe Manana ret = find_next_csum_offset(root, path, &next_offset); 1127ea7036deSFilipe Manana if (ret < 0) 1128ea7036deSFilipe Manana goto out; 1129ea7036deSFilipe Manana found_next = 1; 1130ea7036deSFilipe Manana goto insert; 1131ea7036deSFilipe Manana } 1132ea7036deSFilipe Manana 1133ea7036deSFilipe Manana ret = find_next_csum_offset(root, path, &next_offset); 1134ea7036deSFilipe Manana if (ret < 0) 1135ea7036deSFilipe Manana goto out; 1136ea7036deSFilipe Manana 1137ea7036deSFilipe Manana tmp = (next_offset - bytenr) >> fs_info->sectorsize_bits; 1138ea7036deSFilipe Manana if (tmp <= INT_MAX) 1139ea7036deSFilipe Manana extend_nr = min_t(int, extend_nr, tmp); 1140ea7036deSFilipe Manana } 1141ea7036deSFilipe Manana 11422f697dc6SLiu Bo diff = (csum_offset + extend_nr) * csum_size; 11430b246afaSJeff Mahoney diff = min(diff, 11440b246afaSJeff Mahoney MAX_CSUM_ITEMS(fs_info, csum_size) * csum_size); 1145459931ecSChris Mason 11463212fa14SJosef Bacik diff = diff - btrfs_item_size(leaf, path->slots[0]); 1147cc14600cSFilipe Manana diff = min_t(u32, btrfs_leaf_free_space(leaf), diff); 11482f697dc6SLiu Bo diff /= csum_size; 11492f697dc6SLiu Bo diff *= csum_size; 1150459931ecSChris Mason 1151c71dd880SDavid Sterba btrfs_extend_item(path, diff); 1152f51a4a18SMiao Xie ret = 0; 11536567e837SChris Mason goto csum; 11546567e837SChris Mason } 11556567e837SChris Mason 11566567e837SChris Mason insert: 1157b3b4aa74SDavid Sterba btrfs_release_path(path); 11586567e837SChris Mason csum_offset = 0; 1159f578d4bdSChris Mason if (found_next) { 11602f697dc6SLiu Bo u64 tmp; 1161d20f7043SChris Mason 1162f51a4a18SMiao Xie tmp = sums->len - total_bytes; 1163265fdfa6SDavid Sterba tmp >>= fs_info->sectorsize_bits; 11642f697dc6SLiu Bo tmp = min(tmp, (next_offset - file_key.offset) >> 1165265fdfa6SDavid Sterba fs_info->sectorsize_bits); 11662f697dc6SLiu Bo 116750d0446eSSeraphime Kirkovski tmp = max_t(u64, 1, tmp); 116850d0446eSSeraphime Kirkovski tmp = min_t(u64, tmp, MAX_CSUM_ITEMS(fs_info, csum_size)); 1169607d432dSJosef Bacik ins_size = csum_size * tmp; 1170f578d4bdSChris Mason } else { 1171607d432dSJosef Bacik ins_size = csum_size; 1172f578d4bdSChris Mason } 11735caf2a00SChris Mason ret = btrfs_insert_empty_item(trans, root, path, &file_key, 1174f578d4bdSChris Mason ins_size); 117554aa1f4dSChris Mason if (ret < 0) 1176918cdf44SFilipe Manana goto out; 1177fae7f21cSDulshani Gunawardhana if (WARN_ON(ret != 0)) 1178918cdf44SFilipe Manana goto out; 11795f39d397SChris Mason leaf = path->nodes[0]; 1180f51a4a18SMiao Xie csum: 11815f39d397SChris Mason item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); 1182f51a4a18SMiao Xie item_end = (struct btrfs_csum_item *)((unsigned char *)item + 11833212fa14SJosef Bacik btrfs_item_size(leaf, path->slots[0])); 1184509659cdSChris Mason item = (struct btrfs_csum_item *)((unsigned char *)item + 1185607d432dSJosef Bacik csum_offset * csum_size); 1186b18c6685SChris Mason found: 1187265fdfa6SDavid Sterba ins_size = (u32)(sums->len - total_bytes) >> fs_info->sectorsize_bits; 1188f51a4a18SMiao Xie ins_size *= csum_size; 1189f51a4a18SMiao Xie ins_size = min_t(u32, (unsigned long)item_end - (unsigned long)item, 1190f51a4a18SMiao Xie ins_size); 1191f51a4a18SMiao Xie write_extent_buffer(leaf, sums->sums + index, (unsigned long)item, 1192f51a4a18SMiao Xie ins_size); 1193aadfeb6eSChris Mason 11941e25a2e3SJohannes Thumshirn index += ins_size; 1195f51a4a18SMiao Xie ins_size /= csum_size; 11960b246afaSJeff Mahoney total_bytes += ins_size * fs_info->sectorsize; 1197a6591715SChris Mason 11985caf2a00SChris Mason btrfs_mark_buffer_dirty(path->nodes[0]); 1199e6dcd2dcSChris Mason if (total_bytes < sums->len) { 1200b3b4aa74SDavid Sterba btrfs_release_path(path); 1201b9473439SChris Mason cond_resched(); 1202065631f6SChris Mason goto again; 1203065631f6SChris Mason } 120453863232SChris Mason out: 12055caf2a00SChris Mason btrfs_free_path(path); 1206f254e52cSChris Mason return ret; 1207f254e52cSChris Mason } 12087ffbb598SFilipe Manana 12099cdc5124SNikolay Borisov void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode, 12107ffbb598SFilipe Manana const struct btrfs_path *path, 12117ffbb598SFilipe Manana struct btrfs_file_extent_item *fi, 12127ffbb598SFilipe Manana const bool new_inline, 12137ffbb598SFilipe Manana struct extent_map *em) 12147ffbb598SFilipe Manana { 12153ffbd68cSDavid Sterba struct btrfs_fs_info *fs_info = inode->root->fs_info; 12169cdc5124SNikolay Borisov struct btrfs_root *root = inode->root; 12177ffbb598SFilipe Manana struct extent_buffer *leaf = path->nodes[0]; 12187ffbb598SFilipe Manana const int slot = path->slots[0]; 12197ffbb598SFilipe Manana struct btrfs_key key; 12207ffbb598SFilipe Manana u64 extent_start, extent_end; 12217ffbb598SFilipe Manana u64 bytenr; 12227ffbb598SFilipe Manana u8 type = btrfs_file_extent_type(leaf, fi); 12237ffbb598SFilipe Manana int compress_type = btrfs_file_extent_compression(leaf, fi); 12247ffbb598SFilipe Manana 12257ffbb598SFilipe Manana btrfs_item_key_to_cpu(leaf, &key, slot); 12267ffbb598SFilipe Manana extent_start = key.offset; 1227a5eeb3d1SFilipe Manana extent_end = btrfs_file_extent_end(path); 12287ffbb598SFilipe Manana em->ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); 122940e7efe0SQu Wenruo em->generation = btrfs_file_extent_generation(leaf, fi); 12307ffbb598SFilipe Manana if (type == BTRFS_FILE_EXTENT_REG || 12317ffbb598SFilipe Manana type == BTRFS_FILE_EXTENT_PREALLOC) { 12327ffbb598SFilipe Manana em->start = extent_start; 12337ffbb598SFilipe Manana em->len = extent_end - extent_start; 12347ffbb598SFilipe Manana em->orig_start = extent_start - 12357ffbb598SFilipe Manana btrfs_file_extent_offset(leaf, fi); 12367ffbb598SFilipe Manana em->orig_block_len = btrfs_file_extent_disk_num_bytes(leaf, fi); 12377ffbb598SFilipe Manana bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); 12387ffbb598SFilipe Manana if (bytenr == 0) { 12397ffbb598SFilipe Manana em->block_start = EXTENT_MAP_HOLE; 12407ffbb598SFilipe Manana return; 12417ffbb598SFilipe Manana } 12427ffbb598SFilipe Manana if (compress_type != BTRFS_COMPRESS_NONE) { 12437ffbb598SFilipe Manana set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); 12447ffbb598SFilipe Manana em->compress_type = compress_type; 12457ffbb598SFilipe Manana em->block_start = bytenr; 12467ffbb598SFilipe Manana em->block_len = em->orig_block_len; 12477ffbb598SFilipe Manana } else { 12487ffbb598SFilipe Manana bytenr += btrfs_file_extent_offset(leaf, fi); 12497ffbb598SFilipe Manana em->block_start = bytenr; 12507ffbb598SFilipe Manana em->block_len = em->len; 12517ffbb598SFilipe Manana if (type == BTRFS_FILE_EXTENT_PREALLOC) 12527ffbb598SFilipe Manana set_bit(EXTENT_FLAG_PREALLOC, &em->flags); 12537ffbb598SFilipe Manana } 12547ffbb598SFilipe Manana } else if (type == BTRFS_FILE_EXTENT_INLINE) { 12557ffbb598SFilipe Manana em->block_start = EXTENT_MAP_INLINE; 12567ffbb598SFilipe Manana em->start = extent_start; 12577ffbb598SFilipe Manana em->len = extent_end - extent_start; 12587ffbb598SFilipe Manana /* 12597ffbb598SFilipe Manana * Initialize orig_start and block_len with the same values 12607ffbb598SFilipe Manana * as in inode.c:btrfs_get_extent(). 12617ffbb598SFilipe Manana */ 12627ffbb598SFilipe Manana em->orig_start = EXTENT_MAP_HOLE; 12637ffbb598SFilipe Manana em->block_len = (u64)-1; 12647ffbb598SFilipe Manana if (!new_inline && compress_type != BTRFS_COMPRESS_NONE) { 12657ffbb598SFilipe Manana set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); 12667ffbb598SFilipe Manana em->compress_type = compress_type; 12677ffbb598SFilipe Manana } 12687ffbb598SFilipe Manana } else { 12690b246afaSJeff Mahoney btrfs_err(fs_info, 12709cdc5124SNikolay Borisov "unknown file extent item type %d, inode %llu, offset %llu, " 12719cdc5124SNikolay Borisov "root %llu", type, btrfs_ino(inode), extent_start, 12727ffbb598SFilipe Manana root->root_key.objectid); 12737ffbb598SFilipe Manana } 12747ffbb598SFilipe Manana } 1275a5eeb3d1SFilipe Manana 1276a5eeb3d1SFilipe Manana /* 1277a5eeb3d1SFilipe Manana * Returns the end offset (non inclusive) of the file extent item the given path 1278a5eeb3d1SFilipe Manana * points to. If it points to an inline extent, the returned offset is rounded 1279a5eeb3d1SFilipe Manana * up to the sector size. 1280a5eeb3d1SFilipe Manana */ 1281a5eeb3d1SFilipe Manana u64 btrfs_file_extent_end(const struct btrfs_path *path) 1282a5eeb3d1SFilipe Manana { 1283a5eeb3d1SFilipe Manana const struct extent_buffer *leaf = path->nodes[0]; 1284a5eeb3d1SFilipe Manana const int slot = path->slots[0]; 1285a5eeb3d1SFilipe Manana struct btrfs_file_extent_item *fi; 1286a5eeb3d1SFilipe Manana struct btrfs_key key; 1287a5eeb3d1SFilipe Manana u64 end; 1288a5eeb3d1SFilipe Manana 1289a5eeb3d1SFilipe Manana btrfs_item_key_to_cpu(leaf, &key, slot); 1290a5eeb3d1SFilipe Manana ASSERT(key.type == BTRFS_EXTENT_DATA_KEY); 1291a5eeb3d1SFilipe Manana fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); 1292a5eeb3d1SFilipe Manana 1293a5eeb3d1SFilipe Manana if (btrfs_file_extent_type(leaf, fi) == BTRFS_FILE_EXTENT_INLINE) { 1294a5eeb3d1SFilipe Manana end = btrfs_file_extent_ram_bytes(leaf, fi); 1295a5eeb3d1SFilipe Manana end = ALIGN(key.offset + end, leaf->fs_info->sectorsize); 1296a5eeb3d1SFilipe Manana } else { 1297a5eeb3d1SFilipe Manana end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); 1298a5eeb3d1SFilipe Manana } 1299a5eeb3d1SFilipe Manana 1300a5eeb3d1SFilipe Manana return end; 1301a5eeb3d1SFilipe Manana } 1302