1f5166768STheodore Ts'o // SPDX-License-Identifier: LGPL-2.1 2748de673SAkira Fujita /* 3748de673SAkira Fujita * Copyright (c) 2008,2009 NEC Software Tohoku, Ltd. 4748de673SAkira Fujita * Written by Takashi Sato <t-sato@yk.jp.nec.com> 5748de673SAkira Fujita * Akira Fujita <a-fujita@rs.jp.nec.com> 6748de673SAkira Fujita */ 7748de673SAkira Fujita 8748de673SAkira Fujita #include <linux/fs.h> 9748de673SAkira Fujita #include <linux/quotaops.h> 105a0e3ad6STejun Heo #include <linux/slab.h> 118f50c8b7SMatthew Wilcox (Oracle) #include <linux/sched/mm.h> 12748de673SAkira Fujita #include "ext4_jbd2.h" 13748de673SAkira Fujita #include "ext4.h" 144a092d73STheodore Ts'o #include "ext4_extents.h" 15748de673SAkira Fujita 16e8505970SAkira Fujita /** 17c60990b3STheodore Ts'o * get_ext_path() - Find an extent path for designated logical block number. 18c60990b3STheodore Ts'o * @inode: inode to be searched 19e8505970SAkira Fujita * @lblock: logical block number to find an extent path 20c60990b3STheodore Ts'o * @ppath: pointer to an extent path pointer (for output) 21e8505970SAkira Fujita * 22ed8a1a76STheodore Ts'o * ext4_find_extent wrapper. Return 0 on success, or a negative error value 23e8505970SAkira Fujita * on failure. 24e8505970SAkira Fujita */ 25e8505970SAkira Fujita static inline int 26e8505970SAkira Fujita get_ext_path(struct inode *inode, ext4_lblk_t lblock, 273bdf14b4STheodore Ts'o struct ext4_ext_path **ppath) 28e8505970SAkira Fujita { 290e401101SDmitry Monakhov struct ext4_ext_path *path; 30e8505970SAkira Fujita 31ed8a1a76STheodore Ts'o path = ext4_find_extent(inode, lblock, ppath, EXT4_EX_NOCACHE); 320e401101SDmitry Monakhov if (IS_ERR(path)) 333bdf14b4STheodore Ts'o return PTR_ERR(path); 343bdf14b4STheodore Ts'o if (path[ext_depth(inode)].p_ext == NULL) { 357ff5fddaSYe Bin ext4_free_ext_path(path); 363bdf14b4STheodore Ts'o *ppath = NULL; 373bdf14b4STheodore Ts'o return -ENODATA; 383bdf14b4STheodore Ts'o } 393bdf14b4STheodore Ts'o *ppath = path; 403bdf14b4STheodore Ts'o return 0; 41e8505970SAkira Fujita } 42748de673SAkira Fujita 43748de673SAkira Fujita /** 44c60990b3STheodore Ts'o * ext4_double_down_write_data_sem() - write lock two inodes's i_data_sem 45c60990b3STheodore Ts'o * @first: inode to be locked 46c60990b3STheodore Ts'o * @second: inode to be locked 47748de673SAkira Fujita * 4803bd8b9bSDmitry Monakhov * Acquire write lock of i_data_sem of the two inodes 49748de673SAkira Fujita */ 50393d1d1dSDr. Tilmann Bubeck void 51393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(struct inode *first, struct inode *second) 52748de673SAkira Fujita { 5303bd8b9bSDmitry Monakhov if (first < second) { 54748de673SAkira Fujita down_write(&EXT4_I(first)->i_data_sem); 55daf647d2STheodore Ts'o down_write_nested(&EXT4_I(second)->i_data_sem, I_DATA_SEM_OTHER); 5603bd8b9bSDmitry Monakhov } else { 5703bd8b9bSDmitry Monakhov down_write(&EXT4_I(second)->i_data_sem); 58daf647d2STheodore Ts'o down_write_nested(&EXT4_I(first)->i_data_sem, I_DATA_SEM_OTHER); 5903bd8b9bSDmitry Monakhov 6003bd8b9bSDmitry Monakhov } 61748de673SAkira Fujita } 62748de673SAkira Fujita 63748de673SAkira Fujita /** 64393d1d1dSDr. Tilmann Bubeck * ext4_double_up_write_data_sem - Release two inodes' write lock of i_data_sem 65748de673SAkira Fujita * 66748de673SAkira Fujita * @orig_inode: original inode structure to be released its lock first 67748de673SAkira Fujita * @donor_inode: donor inode structure to be released its lock second 68fc04cb49SAkira Fujita * Release write lock of i_data_sem of two inodes (orig and donor). 69748de673SAkira Fujita */ 70393d1d1dSDr. Tilmann Bubeck void 71393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(struct inode *orig_inode, 72393d1d1dSDr. Tilmann Bubeck struct inode *donor_inode) 73748de673SAkira Fujita { 74748de673SAkira Fujita up_write(&EXT4_I(orig_inode)->i_data_sem); 75748de673SAkira Fujita up_write(&EXT4_I(donor_inode)->i_data_sem); 76748de673SAkira Fujita } 77748de673SAkira Fujita 78748de673SAkira Fujita /** 798c854473SDmitry Monakhov * mext_check_coverage - Check that all extents in range has the same type 808c854473SDmitry Monakhov * 818c854473SDmitry Monakhov * @inode: inode in question 828c854473SDmitry Monakhov * @from: block offset of inode 838c854473SDmitry Monakhov * @count: block count to be checked 84556615dcSLukas Czerner * @unwritten: extents expected to be unwritten 858c854473SDmitry Monakhov * @err: pointer to save error value 868c854473SDmitry Monakhov * 878c854473SDmitry Monakhov * Return 1 if all extents in range has expected type, and zero otherwise. 888c854473SDmitry Monakhov */ 898c854473SDmitry Monakhov static int 908c854473SDmitry Monakhov mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count, 91556615dcSLukas Czerner int unwritten, int *err) 928c854473SDmitry Monakhov { 938c854473SDmitry Monakhov struct ext4_ext_path *path = NULL; 948c854473SDmitry Monakhov struct ext4_extent *ext; 950e401101SDmitry Monakhov int ret = 0; 968c854473SDmitry Monakhov ext4_lblk_t last = from + count; 978c854473SDmitry Monakhov while (from < last) { 988c854473SDmitry Monakhov *err = get_ext_path(inode, from, &path); 998c854473SDmitry Monakhov if (*err) 1000e401101SDmitry Monakhov goto out; 1018c854473SDmitry Monakhov ext = path[ext_depth(inode)].p_ext; 102556615dcSLukas Czerner if (unwritten != ext4_ext_is_unwritten(ext)) 1030e401101SDmitry Monakhov goto out; 1048c854473SDmitry Monakhov from += ext4_ext_get_actual_len(ext); 1058c854473SDmitry Monakhov } 1060e401101SDmitry Monakhov ret = 1; 1070e401101SDmitry Monakhov out: 1087ff5fddaSYe Bin ext4_free_ext_path(path); 1090e401101SDmitry Monakhov return ret; 1108c854473SDmitry Monakhov } 1118c854473SDmitry Monakhov 1128c854473SDmitry Monakhov /** 113e8dfc854SVishal Moola (Oracle) * mext_folio_double_lock - Grab and lock folio on both @inode1 and @inode2 114bb557488SDmitry Monakhov * 115bb557488SDmitry Monakhov * @inode1: the inode structure 116bb557488SDmitry Monakhov * @inode2: the inode structure 117e8dfc854SVishal Moola (Oracle) * @index1: folio index 118e8dfc854SVishal Moola (Oracle) * @index2: folio index 119e8dfc854SVishal Moola (Oracle) * @folio: result folio vector 120bb557488SDmitry Monakhov * 121e8dfc854SVishal Moola (Oracle) * Grab two locked folio for inode's by inode order 122bb557488SDmitry Monakhov */ 123bb557488SDmitry Monakhov static int 124e8dfc854SVishal Moola (Oracle) mext_folio_double_lock(struct inode *inode1, struct inode *inode2, 125e8dfc854SVishal Moola (Oracle) pgoff_t index1, pgoff_t index2, struct folio *folio[2]) 126bb557488SDmitry Monakhov { 127bb557488SDmitry Monakhov struct address_space *mapping[2]; 1288f50c8b7SMatthew Wilcox (Oracle) unsigned int flags; 129e8dfc854SVishal Moola (Oracle) unsigned fgp_flags = FGP_LOCK | FGP_WRITE | FGP_CREAT | FGP_STABLE; 130bb557488SDmitry Monakhov 131bb557488SDmitry Monakhov BUG_ON(!inode1 || !inode2); 132bb557488SDmitry Monakhov if (inode1 < inode2) { 133bb557488SDmitry Monakhov mapping[0] = inode1->i_mapping; 134bb557488SDmitry Monakhov mapping[1] = inode2->i_mapping; 135bb557488SDmitry Monakhov } else { 13662bbdd99SGustavo A. R. Silva swap(index1, index2); 137bb557488SDmitry Monakhov mapping[0] = inode2->i_mapping; 138bb557488SDmitry Monakhov mapping[1] = inode1->i_mapping; 139bb557488SDmitry Monakhov } 140bb557488SDmitry Monakhov 1418f50c8b7SMatthew Wilcox (Oracle) flags = memalloc_nofs_save(); 142e8dfc854SVishal Moola (Oracle) folio[0] = __filemap_get_folio(mapping[0], index1, fgp_flags, 143e8dfc854SVishal Moola (Oracle) mapping_gfp_mask(mapping[0])); 144*66dabbb6SChristoph Hellwig if (IS_ERR(folio[0])) { 1458f50c8b7SMatthew Wilcox (Oracle) memalloc_nofs_restore(flags); 146*66dabbb6SChristoph Hellwig return PTR_ERR(folio[0]); 1478f50c8b7SMatthew Wilcox (Oracle) } 148bb557488SDmitry Monakhov 149e8dfc854SVishal Moola (Oracle) folio[1] = __filemap_get_folio(mapping[1], index2, fgp_flags, 150e8dfc854SVishal Moola (Oracle) mapping_gfp_mask(mapping[1])); 1518f50c8b7SMatthew Wilcox (Oracle) memalloc_nofs_restore(flags); 152*66dabbb6SChristoph Hellwig if (IS_ERR(folio[1])) { 153e8dfc854SVishal Moola (Oracle) folio_unlock(folio[0]); 154e8dfc854SVishal Moola (Oracle) folio_put(folio[0]); 155*66dabbb6SChristoph Hellwig return PTR_ERR(folio[1]); 156bb557488SDmitry Monakhov } 1577e8b12c6SDmitry Monakhov /* 158e8dfc854SVishal Moola (Oracle) * __filemap_get_folio() may not wait on folio's writeback if 1597e8b12c6SDmitry Monakhov * BDI not demand that. But it is reasonable to be very conservative 160e8dfc854SVishal Moola (Oracle) * here and explicitly wait on folio's writeback 1617e8b12c6SDmitry Monakhov */ 162e8dfc854SVishal Moola (Oracle) folio_wait_writeback(folio[0]); 163e8dfc854SVishal Moola (Oracle) folio_wait_writeback(folio[1]); 164bf865467SFabian Frederick if (inode1 > inode2) 165e8dfc854SVishal Moola (Oracle) swap(folio[0], folio[1]); 166bf865467SFabian Frederick 167bb557488SDmitry Monakhov return 0; 168bb557488SDmitry Monakhov } 169bb557488SDmitry Monakhov 170bb557488SDmitry Monakhov /* Force page buffers uptodate w/o dropping page's lock */ 171bb557488SDmitry Monakhov static int 172bb557488SDmitry Monakhov mext_page_mkuptodate(struct page *page, unsigned from, unsigned to) 173bb557488SDmitry Monakhov { 174bb557488SDmitry Monakhov struct inode *inode = page->mapping->host; 175bb557488SDmitry Monakhov sector_t block; 176bb557488SDmitry Monakhov struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE]; 177bb557488SDmitry Monakhov unsigned int blocksize, block_start, block_end; 178bb557488SDmitry Monakhov int i, err, nr = 0, partial = 0; 179bb557488SDmitry Monakhov BUG_ON(!PageLocked(page)); 180bb557488SDmitry Monakhov BUG_ON(PageWriteback(page)); 181bb557488SDmitry Monakhov 182bb557488SDmitry Monakhov if (PageUptodate(page)) 183bb557488SDmitry Monakhov return 0; 184bb557488SDmitry Monakhov 18593407472SFabian Frederick blocksize = i_blocksize(inode); 186bb557488SDmitry Monakhov if (!page_has_buffers(page)) 187bb557488SDmitry Monakhov create_empty_buffers(page, blocksize, 0); 188bb557488SDmitry Monakhov 189bb557488SDmitry Monakhov head = page_buffers(page); 19009cbfeafSKirill A. Shutemov block = (sector_t)page->index << (PAGE_SHIFT - inode->i_blkbits); 191bb557488SDmitry Monakhov for (bh = head, block_start = 0; bh != head || !block_start; 192bb557488SDmitry Monakhov block++, block_start = block_end, bh = bh->b_this_page) { 193bb557488SDmitry Monakhov block_end = block_start + blocksize; 194bb557488SDmitry Monakhov if (block_end <= from || block_start >= to) { 195bb557488SDmitry Monakhov if (!buffer_uptodate(bh)) 196bb557488SDmitry Monakhov partial = 1; 197bb557488SDmitry Monakhov continue; 198bb557488SDmitry Monakhov } 199bb557488SDmitry Monakhov if (buffer_uptodate(bh)) 200bb557488SDmitry Monakhov continue; 201bb557488SDmitry Monakhov if (!buffer_mapped(bh)) { 202bb557488SDmitry Monakhov err = ext4_get_block(inode, block, bh, 0); 203bb557488SDmitry Monakhov if (err) { 204bb557488SDmitry Monakhov SetPageError(page); 205bb557488SDmitry Monakhov return err; 206bb557488SDmitry Monakhov } 207bb557488SDmitry Monakhov if (!buffer_mapped(bh)) { 208bb557488SDmitry Monakhov zero_user(page, block_start, blocksize); 209bb557488SDmitry Monakhov set_buffer_uptodate(bh); 210bb557488SDmitry Monakhov continue; 211bb557488SDmitry Monakhov } 212bb557488SDmitry Monakhov } 213bb557488SDmitry Monakhov BUG_ON(nr >= MAX_BUF_PER_PAGE); 214bb557488SDmitry Monakhov arr[nr++] = bh; 215bb557488SDmitry Monakhov } 216bb557488SDmitry Monakhov /* No io required */ 217bb557488SDmitry Monakhov if (!nr) 218bb557488SDmitry Monakhov goto out; 219bb557488SDmitry Monakhov 220bb557488SDmitry Monakhov for (i = 0; i < nr; i++) { 221bb557488SDmitry Monakhov bh = arr[i]; 222bb557488SDmitry Monakhov if (!bh_uptodate_or_lock(bh)) { 2232d069c08Szhangyi (F) err = ext4_read_bh(bh, 0, NULL); 224bb557488SDmitry Monakhov if (err) 225bb557488SDmitry Monakhov return err; 226bb557488SDmitry Monakhov } 227bb557488SDmitry Monakhov } 228bb557488SDmitry Monakhov out: 229bb557488SDmitry Monakhov if (!partial) 230bb557488SDmitry Monakhov SetPageUptodate(page); 231bb557488SDmitry Monakhov return 0; 232bb557488SDmitry Monakhov } 233bb557488SDmitry Monakhov 234bb557488SDmitry Monakhov /** 235748de673SAkira Fujita * move_extent_per_page - Move extent data per page 236748de673SAkira Fujita * 237748de673SAkira Fujita * @o_filp: file structure of original file 238748de673SAkira Fujita * @donor_inode: donor inode 239748de673SAkira Fujita * @orig_page_offset: page index on original file 24065dd8327SXiaoguang Wang * @donor_page_offset: page index on donor file 241748de673SAkira Fujita * @data_offset_in_page: block index where data swapping starts 242748de673SAkira Fujita * @block_len_in_page: the number of blocks to be swapped 243556615dcSLukas Czerner * @unwritten: orig extent is unwritten or not 244f868a48dSAkira Fujita * @err: pointer to save return value 245748de673SAkira Fujita * 246748de673SAkira Fujita * Save the data in original inode blocks and replace original inode extents 24765dd8327SXiaoguang Wang * with donor inode extents by calling ext4_swap_extents(). 248f868a48dSAkira Fujita * Finally, write out the saved data in new original inode blocks. Return 249f868a48dSAkira Fujita * replaced block count. 250748de673SAkira Fujita */ 251748de673SAkira Fujita static int 25244fc48f7SAkira Fujita move_extent_per_page(struct file *o_filp, struct inode *donor_inode, 253fcf6b1b7SDmitry Monakhov pgoff_t orig_page_offset, pgoff_t donor_page_offset, 254fcf6b1b7SDmitry Monakhov int data_offset_in_page, 255556615dcSLukas Czerner int block_len_in_page, int unwritten, int *err) 256748de673SAkira Fujita { 257496ad9aaSAl Viro struct inode *orig_inode = file_inode(o_filp); 2586dd8fe86SVishal Moola (Oracle) struct folio *folio[2] = {NULL, NULL}; 259748de673SAkira Fujita handle_t *handle; 260fcf6b1b7SDmitry Monakhov ext4_lblk_t orig_blk_offset, donor_blk_offset; 261748de673SAkira Fujita unsigned long blocksize = orig_inode->i_sb->s_blocksize; 262f868a48dSAkira Fujita unsigned int tmp_data_size, data_size, replaced_size; 263bcff2488SEryu Guan int i, err2, jblocks, retries = 0; 264f868a48dSAkira Fujita int replaced_count = 0; 265bb557488SDmitry Monakhov int from = data_offset_in_page << orig_inode->i_blkbits; 26609cbfeafSKirill A. Shutemov int blocks_per_page = PAGE_SIZE >> orig_inode->i_blkbits; 26788c6b61fSDmitry Monakhov struct super_block *sb = orig_inode->i_sb; 268bcff2488SEryu Guan struct buffer_head *bh = NULL; 269748de673SAkira Fujita 270748de673SAkira Fujita /* 271748de673SAkira Fujita * It needs twice the amount of ordinary journal buffers because 272748de673SAkira Fujita * inode and donor_inode may change each different metadata blocks. 273748de673SAkira Fujita */ 274bb557488SDmitry Monakhov again: 275bb557488SDmitry Monakhov *err = 0; 276748de673SAkira Fujita jblocks = ext4_writepage_trans_blocks(orig_inode) * 2; 2779924a92aSTheodore Ts'o handle = ext4_journal_start(orig_inode, EXT4_HT_MOVE_EXTENTS, jblocks); 278748de673SAkira Fujita if (IS_ERR(handle)) { 279f868a48dSAkira Fujita *err = PTR_ERR(handle); 280f868a48dSAkira Fujita return 0; 281748de673SAkira Fujita } 282748de673SAkira Fujita 283748de673SAkira Fujita orig_blk_offset = orig_page_offset * blocks_per_page + 284748de673SAkira Fujita data_offset_in_page; 285748de673SAkira Fujita 286fcf6b1b7SDmitry Monakhov donor_blk_offset = donor_page_offset * blocks_per_page + 287fcf6b1b7SDmitry Monakhov data_offset_in_page; 288fcf6b1b7SDmitry Monakhov 289f868a48dSAkira Fujita /* Calculate data_size */ 290748de673SAkira Fujita if ((orig_blk_offset + block_len_in_page - 1) == 291748de673SAkira Fujita ((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) { 292748de673SAkira Fujita /* Replace the last block */ 293f868a48dSAkira Fujita tmp_data_size = orig_inode->i_size & (blocksize - 1); 294748de673SAkira Fujita /* 295f868a48dSAkira Fujita * If data_size equal zero, it shows data_size is multiples of 296748de673SAkira Fujita * blocksize. So we set appropriate value. 297748de673SAkira Fujita */ 298f868a48dSAkira Fujita if (tmp_data_size == 0) 299f868a48dSAkira Fujita tmp_data_size = blocksize; 300748de673SAkira Fujita 301f868a48dSAkira Fujita data_size = tmp_data_size + 302748de673SAkira Fujita ((block_len_in_page - 1) << orig_inode->i_blkbits); 303f868a48dSAkira Fujita } else 304f868a48dSAkira Fujita data_size = block_len_in_page << orig_inode->i_blkbits; 305748de673SAkira Fujita 306f868a48dSAkira Fujita replaced_size = data_size; 307f868a48dSAkira Fujita 308e8dfc854SVishal Moola (Oracle) *err = mext_folio_double_lock(orig_inode, donor_inode, orig_page_offset, 309e8dfc854SVishal Moola (Oracle) donor_page_offset, folio); 310f868a48dSAkira Fujita if (unlikely(*err < 0)) 311bb557488SDmitry Monakhov goto stop_journal; 3128c854473SDmitry Monakhov /* 313556615dcSLukas Czerner * If orig extent was unwritten it can become initialized 3148c854473SDmitry Monakhov * at any time after i_data_sem was dropped, in order to 3158c854473SDmitry Monakhov * serialize with delalloc we have recheck extent while we 3168c854473SDmitry Monakhov * hold page's lock, if it is still the case data copy is not 3178c854473SDmitry Monakhov * necessary, just swap data blocks between orig and donor. 3188c854473SDmitry Monakhov */ 3196dd8fe86SVishal Moola (Oracle) 3206dd8fe86SVishal Moola (Oracle) VM_BUG_ON_FOLIO(folio_test_large(folio[0]), folio[0]); 3216dd8fe86SVishal Moola (Oracle) VM_BUG_ON_FOLIO(folio_test_large(folio[1]), folio[1]); 3226dd8fe86SVishal Moola (Oracle) VM_BUG_ON_FOLIO(folio_nr_pages(folio[0]) != folio_nr_pages(folio[1]), folio[1]); 3236dd8fe86SVishal Moola (Oracle) 324556615dcSLukas Czerner if (unwritten) { 325393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode); 3268c854473SDmitry Monakhov /* If any of extents in range became initialized we have to 3278c854473SDmitry Monakhov * fallback to data copying */ 328556615dcSLukas Czerner unwritten = mext_check_coverage(orig_inode, orig_blk_offset, 3298c854473SDmitry Monakhov block_len_in_page, 1, err); 3308c854473SDmitry Monakhov if (*err) 3318c854473SDmitry Monakhov goto drop_data_sem; 332748de673SAkira Fujita 333fcf6b1b7SDmitry Monakhov unwritten &= mext_check_coverage(donor_inode, donor_blk_offset, 3348c854473SDmitry Monakhov block_len_in_page, 1, err); 3358c854473SDmitry Monakhov if (*err) 3368c854473SDmitry Monakhov goto drop_data_sem; 3378c854473SDmitry Monakhov 338556615dcSLukas Czerner if (!unwritten) { 339393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 3408c854473SDmitry Monakhov goto data_copy; 3418c854473SDmitry Monakhov } 3426dd8fe86SVishal Moola (Oracle) if ((folio_has_private(folio[0]) && 3436dd8fe86SVishal Moola (Oracle) !filemap_release_folio(folio[0], 0)) || 3446dd8fe86SVishal Moola (Oracle) (folio_has_private(folio[1]) && 3456dd8fe86SVishal Moola (Oracle) !filemap_release_folio(folio[1], 0))) { 3468c854473SDmitry Monakhov *err = -EBUSY; 3478c854473SDmitry Monakhov goto drop_data_sem; 3488c854473SDmitry Monakhov } 349fcf6b1b7SDmitry Monakhov replaced_count = ext4_swap_extents(handle, orig_inode, 3508c854473SDmitry Monakhov donor_inode, orig_blk_offset, 351fcf6b1b7SDmitry Monakhov donor_blk_offset, 352fcf6b1b7SDmitry Monakhov block_len_in_page, 1, err); 3538c854473SDmitry Monakhov drop_data_sem: 354393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 3556dd8fe86SVishal Moola (Oracle) goto unlock_folios; 3568c854473SDmitry Monakhov } 3578c854473SDmitry Monakhov data_copy: 3586dd8fe86SVishal Moola (Oracle) *err = mext_page_mkuptodate(&folio[0]->page, from, from + replaced_size); 359bb557488SDmitry Monakhov if (*err) 3606dd8fe86SVishal Moola (Oracle) goto unlock_folios; 361bb557488SDmitry Monakhov 362bb557488SDmitry Monakhov /* At this point all buffers in range are uptodate, old mapping layout 363bb557488SDmitry Monakhov * is no longer required, try to drop it now. */ 3646dd8fe86SVishal Moola (Oracle) if ((folio_has_private(folio[0]) && 3656dd8fe86SVishal Moola (Oracle) !filemap_release_folio(folio[0], 0)) || 3666dd8fe86SVishal Moola (Oracle) (folio_has_private(folio[1]) && 3676dd8fe86SVishal Moola (Oracle) !filemap_release_folio(folio[1], 0))) { 368bb557488SDmitry Monakhov *err = -EBUSY; 3696dd8fe86SVishal Moola (Oracle) goto unlock_folios; 370748de673SAkira Fujita } 3716e263146SDmitry Monakhov ext4_double_down_write_data_sem(orig_inode, donor_inode); 372fcf6b1b7SDmitry Monakhov replaced_count = ext4_swap_extents(handle, orig_inode, donor_inode, 373fcf6b1b7SDmitry Monakhov orig_blk_offset, donor_blk_offset, 374fcf6b1b7SDmitry Monakhov block_len_in_page, 1, err); 3756e263146SDmitry Monakhov ext4_double_up_write_data_sem(orig_inode, donor_inode); 376bb557488SDmitry Monakhov if (*err) { 377f868a48dSAkira Fujita if (replaced_count) { 378f868a48dSAkira Fujita block_len_in_page = replaced_count; 379f868a48dSAkira Fujita replaced_size = 380f868a48dSAkira Fujita block_len_in_page << orig_inode->i_blkbits; 381ac48b0a1SAkira Fujita } else 3826dd8fe86SVishal Moola (Oracle) goto unlock_folios; 383f868a48dSAkira Fujita } 384bb557488SDmitry Monakhov /* Perform all necessary steps similar write_begin()/write_end() 385bb557488SDmitry Monakhov * but keeping in mind that i_size will not change */ 3866dd8fe86SVishal Moola (Oracle) if (!folio_buffers(folio[0])) 3876dd8fe86SVishal Moola (Oracle) create_empty_buffers(&folio[0]->page, 1 << orig_inode->i_blkbits, 0); 3886dd8fe86SVishal Moola (Oracle) bh = folio_buffers(folio[0]); 389bcff2488SEryu Guan for (i = 0; i < data_offset_in_page; i++) 390bcff2488SEryu Guan bh = bh->b_this_page; 391bcff2488SEryu Guan for (i = 0; i < block_len_in_page; i++) { 392bcff2488SEryu Guan *err = ext4_get_block(orig_inode, orig_blk_offset + i, bh, 0); 393bcff2488SEryu Guan if (*err < 0) 394bcff2488SEryu Guan break; 3956ffe77baSEryu Guan bh = bh->b_this_page; 396bcff2488SEryu Guan } 397bb557488SDmitry Monakhov if (!*err) 3986dd8fe86SVishal Moola (Oracle) *err = block_commit_write(&folio[0]->page, from, from + replaced_size); 399fc04cb49SAkira Fujita 400bb557488SDmitry Monakhov if (unlikely(*err < 0)) 401bb557488SDmitry Monakhov goto repair_branches; 402748de673SAkira Fujita 403bb557488SDmitry Monakhov /* Even in case of data=writeback it is reasonable to pin 404bb557488SDmitry Monakhov * inode to transaction, to prevent unexpected data loss */ 40573131fbbSRoss Zwisler *err = ext4_jbd2_inode_add_write(handle, orig_inode, 40673131fbbSRoss Zwisler (loff_t)orig_page_offset << PAGE_SHIFT, replaced_size); 407748de673SAkira Fujita 4086dd8fe86SVishal Moola (Oracle) unlock_folios: 4096dd8fe86SVishal Moola (Oracle) folio_unlock(folio[0]); 4106dd8fe86SVishal Moola (Oracle) folio_put(folio[0]); 4116dd8fe86SVishal Moola (Oracle) folio_unlock(folio[1]); 4126dd8fe86SVishal Moola (Oracle) folio_put(folio[1]); 413bb557488SDmitry Monakhov stop_journal: 41491cc219aSPeng Tao ext4_journal_stop(handle); 41588c6b61fSDmitry Monakhov if (*err == -ENOSPC && 41688c6b61fSDmitry Monakhov ext4_should_retry_alloc(sb, &retries)) 41788c6b61fSDmitry Monakhov goto again; 418bb557488SDmitry Monakhov /* Buffer was busy because probably is pinned to journal transaction, 419bb557488SDmitry Monakhov * force transaction commit may help to free it. */ 42088c6b61fSDmitry Monakhov if (*err == -EBUSY && retries++ < 4 && EXT4_SB(sb)->s_journal && 42188c6b61fSDmitry Monakhov jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal)) 422bb557488SDmitry Monakhov goto again; 423f868a48dSAkira Fujita return replaced_count; 424bb557488SDmitry Monakhov 425bb557488SDmitry Monakhov repair_branches: 426bb557488SDmitry Monakhov /* 427bb557488SDmitry Monakhov * This should never ever happen! 428bb557488SDmitry Monakhov * Extents are swapped already, but we are not able to copy data. 429bb557488SDmitry Monakhov * Try to swap extents to it's original places 430bb557488SDmitry Monakhov */ 431393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode); 432fcf6b1b7SDmitry Monakhov replaced_count = ext4_swap_extents(handle, donor_inode, orig_inode, 433fcf6b1b7SDmitry Monakhov orig_blk_offset, donor_blk_offset, 434fcf6b1b7SDmitry Monakhov block_len_in_page, 0, &err2); 435393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 436bb557488SDmitry Monakhov if (replaced_count != block_len_in_page) { 43754d3adbcSTheodore Ts'o ext4_error_inode_block(orig_inode, (sector_t)(orig_blk_offset), 43854d3adbcSTheodore Ts'o EIO, "Unable to copy data block," 439bb557488SDmitry Monakhov " data will be lost."); 440bb557488SDmitry Monakhov *err = -EIO; 441bb557488SDmitry Monakhov } 442bb557488SDmitry Monakhov replaced_count = 0; 4436dd8fe86SVishal Moola (Oracle) goto unlock_folios; 444748de673SAkira Fujita } 445748de673SAkira Fujita 446748de673SAkira Fujita /** 447c437b273SAkira Fujita * mext_check_arguments - Check whether move extent can be done 448748de673SAkira Fujita * 449748de673SAkira Fujita * @orig_inode: original inode 450748de673SAkira Fujita * @donor_inode: donor inode 451748de673SAkira Fujita * @orig_start: logical start offset in block for orig 452748de673SAkira Fujita * @donor_start: logical start offset in block for donor 453748de673SAkira Fujita * @len: the number of blocks to be moved 454748de673SAkira Fujita * 455748de673SAkira Fujita * Check the arguments of ext4_move_extents() whether the files can be 456748de673SAkira Fujita * exchanged with each other. 457748de673SAkira Fujita * Return 0 on success, or a negative error value on failure. 458748de673SAkira Fujita */ 459748de673SAkira Fujita static int 460748de673SAkira Fujita mext_check_arguments(struct inode *orig_inode, 461748de673SAkira Fujita struct inode *donor_inode, __u64 orig_start, 462446aaa6eSKazuya Mio __u64 donor_start, __u64 *len) 463748de673SAkira Fujita { 464fcf6b1b7SDmitry Monakhov __u64 orig_eof, donor_eof; 46570d5d3dcSAkira Fujita unsigned int blkbits = orig_inode->i_blkbits; 46670d5d3dcSAkira Fujita unsigned int blocksize = 1 << blkbits; 46770d5d3dcSAkira Fujita 468fcf6b1b7SDmitry Monakhov orig_eof = (i_size_read(orig_inode) + blocksize - 1) >> blkbits; 469fcf6b1b7SDmitry Monakhov donor_eof = (i_size_read(donor_inode) + blocksize - 1) >> blkbits; 470fcf6b1b7SDmitry Monakhov 471fcf6b1b7SDmitry Monakhov 4724a58579bSAkira Fujita if (donor_inode->i_mode & (S_ISUID|S_ISGID)) { 4734a58579bSAkira Fujita ext4_debug("ext4 move extent: suid or sgid is set" 4744a58579bSAkira Fujita " to donor file [ino:orig %lu, donor %lu]\n", 4754a58579bSAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 4764a58579bSAkira Fujita return -EINVAL; 4774a58579bSAkira Fujita } 4784a58579bSAkira Fujita 4791f5a81e4STheodore Ts'o if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode)) 4801f5a81e4STheodore Ts'o return -EPERM; 4811f5a81e4STheodore Ts'o 482d412df53SEric Whitney /* Ext4 move extent does not support swap files */ 483748de673SAkira Fujita if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) { 484d412df53SEric Whitney ext4_debug("ext4 move extent: The argument files should not be swap files [ino:orig %lu, donor %lu]\n", 485748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 486d412df53SEric Whitney return -ETXTBSY; 487748de673SAkira Fujita } 488748de673SAkira Fujita 48902749a4cSTahsin Erdogan if (ext4_is_quota_file(orig_inode) && ext4_is_quota_file(donor_inode)) { 490d412df53SEric Whitney ext4_debug("ext4 move extent: The argument files should not be quota files [ino:orig %lu, donor %lu]\n", 491daf647d2STheodore Ts'o orig_inode->i_ino, donor_inode->i_ino); 492d412df53SEric Whitney return -EOPNOTSUPP; 493daf647d2STheodore Ts'o } 494daf647d2STheodore Ts'o 495748de673SAkira Fujita /* Ext4 move extent supports only extent based file */ 49612e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(orig_inode, EXT4_INODE_EXTENTS))) { 497748de673SAkira Fujita ext4_debug("ext4 move extent: orig file is not extents " 498748de673SAkira Fujita "based file [ino:orig %lu]\n", orig_inode->i_ino); 499748de673SAkira Fujita return -EOPNOTSUPP; 50012e9b892SDmitry Monakhov } else if (!(ext4_test_inode_flag(donor_inode, EXT4_INODE_EXTENTS))) { 501748de673SAkira Fujita ext4_debug("ext4 move extent: donor file is not extents " 502748de673SAkira Fujita "based file [ino:donor %lu]\n", donor_inode->i_ino); 503748de673SAkira Fujita return -EOPNOTSUPP; 504748de673SAkira Fujita } 505748de673SAkira Fujita 506748de673SAkira Fujita if ((!orig_inode->i_size) || (!donor_inode->i_size)) { 507748de673SAkira Fujita ext4_debug("ext4 move extent: File size is 0 byte\n"); 508748de673SAkira Fujita return -EINVAL; 509748de673SAkira Fujita } 510748de673SAkira Fujita 511748de673SAkira Fujita /* Start offset should be same */ 512fcf6b1b7SDmitry Monakhov if ((orig_start & ~(PAGE_MASK >> orig_inode->i_blkbits)) != 513fcf6b1b7SDmitry Monakhov (donor_start & ~(PAGE_MASK >> orig_inode->i_blkbits))) { 514748de673SAkira Fujita ext4_debug("ext4 move extent: orig and donor's start " 515d67d64f4STheodore Ts'o "offsets are not aligned [ino:orig %lu, donor %lu]\n", 516748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 517748de673SAkira Fujita return -EINVAL; 518748de673SAkira Fujita } 519748de673SAkira Fujita 520f17722f9SLukas Czerner if ((orig_start >= EXT_MAX_BLOCKS) || 521fcf6b1b7SDmitry Monakhov (donor_start >= EXT_MAX_BLOCKS) || 522f17722f9SLukas Czerner (*len > EXT_MAX_BLOCKS) || 523fcf6b1b7SDmitry Monakhov (donor_start + *len >= EXT_MAX_BLOCKS) || 524f17722f9SLukas Czerner (orig_start + *len >= EXT_MAX_BLOCKS)) { 5250a80e986SEric Sandeen ext4_debug("ext4 move extent: Can't handle over [%u] blocks " 526f17722f9SLukas Czerner "[ino:orig %lu, donor %lu]\n", EXT_MAX_BLOCKS, 527748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 528748de673SAkira Fujita return -EINVAL; 529748de673SAkira Fujita } 530f18b2b83STheodore Ts'o if (orig_eof <= orig_start) 531f18b2b83STheodore Ts'o *len = 0; 532f18b2b83STheodore Ts'o else if (orig_eof < orig_start + *len - 1) 533fcf6b1b7SDmitry Monakhov *len = orig_eof - orig_start; 534f18b2b83STheodore Ts'o if (donor_eof <= donor_start) 535f18b2b83STheodore Ts'o *len = 0; 536f18b2b83STheodore Ts'o else if (donor_eof < donor_start + *len - 1) 537fcf6b1b7SDmitry Monakhov *len = donor_eof - donor_start; 538748de673SAkira Fujita if (!*len) { 53992c28159SAkira Fujita ext4_debug("ext4 move extent: len should not be 0 " 540748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", orig_inode->i_ino, 541748de673SAkira Fujita donor_inode->i_ino); 542748de673SAkira Fujita return -EINVAL; 543748de673SAkira Fujita } 544748de673SAkira Fujita 545748de673SAkira Fujita return 0; 546748de673SAkira Fujita } 547748de673SAkira Fujita 548748de673SAkira Fujita /** 549748de673SAkira Fujita * ext4_move_extents - Exchange the specified range of a file 550748de673SAkira Fujita * 551748de673SAkira Fujita * @o_filp: file structure of the original file 552748de673SAkira Fujita * @d_filp: file structure of the donor file 55365dd8327SXiaoguang Wang * @orig_blk: start offset in block for orig 55465dd8327SXiaoguang Wang * @donor_blk: start offset in block for donor 555748de673SAkira Fujita * @len: the number of blocks to be moved 556748de673SAkira Fujita * @moved_len: moved block length 557748de673SAkira Fujita * 558748de673SAkira Fujita * This function returns 0 and moved block length is set in moved_len 559748de673SAkira Fujita * if succeed, otherwise returns error value. 560748de673SAkira Fujita * 561748de673SAkira Fujita */ 562748de673SAkira Fujita int 563fcf6b1b7SDmitry Monakhov ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk, 564fcf6b1b7SDmitry Monakhov __u64 donor_blk, __u64 len, __u64 *moved_len) 565748de673SAkira Fujita { 566496ad9aaSAl Viro struct inode *orig_inode = file_inode(o_filp); 567496ad9aaSAl Viro struct inode *donor_inode = file_inode(d_filp); 568fcf6b1b7SDmitry Monakhov struct ext4_ext_path *path = NULL; 56909cbfeafSKirill A. Shutemov int blocks_per_page = PAGE_SIZE >> orig_inode->i_blkbits; 570fcf6b1b7SDmitry Monakhov ext4_lblk_t o_end, o_start = orig_blk; 571fcf6b1b7SDmitry Monakhov ext4_lblk_t d_start = donor_blk; 572fcf6b1b7SDmitry Monakhov int ret; 573748de673SAkira Fujita 57403bd8b9bSDmitry Monakhov if (orig_inode->i_sb != donor_inode->i_sb) { 57503bd8b9bSDmitry Monakhov ext4_debug("ext4 move extent: The argument files " 57603bd8b9bSDmitry Monakhov "should be in same FS [ino:orig %lu, donor %lu]\n", 57703bd8b9bSDmitry Monakhov orig_inode->i_ino, donor_inode->i_ino); 57803bd8b9bSDmitry Monakhov return -EINVAL; 57903bd8b9bSDmitry Monakhov } 58003bd8b9bSDmitry Monakhov 58103bd8b9bSDmitry Monakhov /* orig and donor should be different inodes */ 58203bd8b9bSDmitry Monakhov if (orig_inode == donor_inode) { 583f3ce8064STheodore Ts'o ext4_debug("ext4 move extent: The argument files should not " 58403bd8b9bSDmitry Monakhov "be same inode [ino:orig %lu, donor %lu]\n", 585f3ce8064STheodore Ts'o orig_inode->i_ino, donor_inode->i_ino); 586f3ce8064STheodore Ts'o return -EINVAL; 587f3ce8064STheodore Ts'o } 588f3ce8064STheodore Ts'o 5897247c0caSAkira Fujita /* Regular file check */ 5907247c0caSAkira Fujita if (!S_ISREG(orig_inode->i_mode) || !S_ISREG(donor_inode->i_mode)) { 5917247c0caSAkira Fujita ext4_debug("ext4 move extent: The argument files should be " 5927247c0caSAkira Fujita "regular file [ino:orig %lu, donor %lu]\n", 5937247c0caSAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 5947247c0caSAkira Fujita return -EINVAL; 5957247c0caSAkira Fujita } 59604e22412SEric Whitney 59704e22412SEric Whitney /* TODO: it's not obvious how to swap blocks for inodes with full 59804e22412SEric Whitney journaling enabled */ 599f066055aSDmitry Monakhov if (ext4_should_journal_data(orig_inode) || 600f066055aSDmitry Monakhov ext4_should_journal_data(donor_inode)) { 60104e22412SEric Whitney ext4_msg(orig_inode->i_sb, KERN_ERR, 60204e22412SEric Whitney "Online defrag not supported with data journaling"); 60304e22412SEric Whitney return -EOPNOTSUPP; 604f066055aSDmitry Monakhov } 60504e22412SEric Whitney 606592ddec7SChandan Rajendra if (IS_ENCRYPTED(orig_inode) || IS_ENCRYPTED(donor_inode)) { 60714fbd4aaSEric Whitney ext4_msg(orig_inode->i_sb, KERN_ERR, 60814fbd4aaSEric Whitney "Online defrag not supported for encrypted files"); 60914fbd4aaSEric Whitney return -EOPNOTSUPP; 61014fbd4aaSEric Whitney } 61114fbd4aaSEric Whitney 612fc04cb49SAkira Fujita /* Protect orig and donor inodes against a truncate */ 613375e289eSJ. Bruce Fields lock_two_nondirectories(orig_inode, donor_inode); 614748de673SAkira Fujita 61517335dccSDmitry Monakhov /* Wait for all existing dio workers */ 61617335dccSDmitry Monakhov inode_dio_wait(orig_inode); 61717335dccSDmitry Monakhov inode_dio_wait(donor_inode); 61817335dccSDmitry Monakhov 619fc04cb49SAkira Fujita /* Protect extent tree against block allocations via delalloc */ 620393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode); 621748de673SAkira Fujita /* Check the filesystem environment whether move_extent can be done */ 622fcf6b1b7SDmitry Monakhov ret = mext_check_arguments(orig_inode, donor_inode, orig_blk, 623fcf6b1b7SDmitry Monakhov donor_blk, &len); 62403bd8b9bSDmitry Monakhov if (ret) 625347fa6f1SAkira Fujita goto out; 626fcf6b1b7SDmitry Monakhov o_end = o_start + len; 627748de673SAkira Fujita 628fcf6b1b7SDmitry Monakhov while (o_start < o_end) { 629fcf6b1b7SDmitry Monakhov struct ext4_extent *ex; 630fcf6b1b7SDmitry Monakhov ext4_lblk_t cur_blk, next_blk; 631fcf6b1b7SDmitry Monakhov pgoff_t orig_page_index, donor_page_index; 632fcf6b1b7SDmitry Monakhov int offset_in_page; 633fcf6b1b7SDmitry Monakhov int unwritten, cur_len; 634748de673SAkira Fujita 635fcf6b1b7SDmitry Monakhov ret = get_ext_path(orig_inode, o_start, &path); 63603bd8b9bSDmitry Monakhov if (ret) 637347fa6f1SAkira Fujita goto out; 638fcf6b1b7SDmitry Monakhov ex = path[path->p_depth].p_ext; 639fcf6b1b7SDmitry Monakhov cur_blk = le32_to_cpu(ex->ee_block); 640fcf6b1b7SDmitry Monakhov cur_len = ext4_ext_get_actual_len(ex); 641fcf6b1b7SDmitry Monakhov /* Check hole before the start pos */ 642fcf6b1b7SDmitry Monakhov if (cur_blk + cur_len - 1 < o_start) { 643d412df53SEric Whitney next_blk = ext4_ext_next_allocated_block(path); 644fcf6b1b7SDmitry Monakhov if (next_blk == EXT_MAX_BLOCKS) { 645fcf6b1b7SDmitry Monakhov ret = -ENODATA; 646748de673SAkira Fujita goto out; 647748de673SAkira Fujita } 648fcf6b1b7SDmitry Monakhov d_start += next_blk - o_start; 649fcf6b1b7SDmitry Monakhov o_start = next_blk; 6503bdf14b4STheodore Ts'o continue; 651fcf6b1b7SDmitry Monakhov /* Check hole after the start pos */ 652fcf6b1b7SDmitry Monakhov } else if (cur_blk > o_start) { 653fcf6b1b7SDmitry Monakhov /* Skip hole */ 654fcf6b1b7SDmitry Monakhov d_start += cur_blk - o_start; 655fcf6b1b7SDmitry Monakhov o_start = cur_blk; 656fcf6b1b7SDmitry Monakhov /* Extent inside requested range ?*/ 657fcf6b1b7SDmitry Monakhov if (cur_blk >= o_end) 658748de673SAkira Fujita goto out; 659fcf6b1b7SDmitry Monakhov } else { /* in_range(o_start, o_blk, o_len) */ 660fcf6b1b7SDmitry Monakhov cur_len += cur_blk - o_start; 661748de673SAkira Fujita } 662fcf6b1b7SDmitry Monakhov unwritten = ext4_ext_is_unwritten(ex); 663fcf6b1b7SDmitry Monakhov if (o_end - o_start < cur_len) 664fcf6b1b7SDmitry Monakhov cur_len = o_end - o_start; 665748de673SAkira Fujita 66609cbfeafSKirill A. Shutemov orig_page_index = o_start >> (PAGE_SHIFT - 667fcf6b1b7SDmitry Monakhov orig_inode->i_blkbits); 66809cbfeafSKirill A. Shutemov donor_page_index = d_start >> (PAGE_SHIFT - 669fcf6b1b7SDmitry Monakhov donor_inode->i_blkbits); 670fcf6b1b7SDmitry Monakhov offset_in_page = o_start % blocks_per_page; 671fcf6b1b7SDmitry Monakhov if (cur_len > blocks_per_page - offset_in_page) 672fcf6b1b7SDmitry Monakhov cur_len = blocks_per_page - offset_in_page; 673fc04cb49SAkira Fujita /* 674fc04cb49SAkira Fujita * Up semaphore to avoid following problems: 675fc04cb49SAkira Fujita * a. transaction deadlock among ext4_journal_start, 676fc04cb49SAkira Fujita * ->write_begin via pagefault, and jbd2_journal_commit 677fe5ddf6bSMatthew Wilcox (Oracle) * b. racing with ->read_folio, ->write_begin, and 678fe5ddf6bSMatthew Wilcox (Oracle) * ext4_get_block in move_extent_per_page 679fc04cb49SAkira Fujita */ 680393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 681748de673SAkira Fujita /* Swap original branches with new branches */ 682fcf6b1b7SDmitry Monakhov move_extent_per_page(o_filp, donor_inode, 683fcf6b1b7SDmitry Monakhov orig_page_index, donor_page_index, 684fcf6b1b7SDmitry Monakhov offset_in_page, cur_len, 685556615dcSLukas Czerner unwritten, &ret); 686393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode); 68703bd8b9bSDmitry Monakhov if (ret < 0) 688fc04cb49SAkira Fujita break; 689fcf6b1b7SDmitry Monakhov o_start += cur_len; 690fcf6b1b7SDmitry Monakhov d_start += cur_len; 691748de673SAkira Fujita } 692fcf6b1b7SDmitry Monakhov *moved_len = o_start - orig_blk; 693fcf6b1b7SDmitry Monakhov if (*moved_len > len) 694fcf6b1b7SDmitry Monakhov *moved_len = len; 695fcf6b1b7SDmitry Monakhov 696748de673SAkira Fujita out: 69794d7c16cSAkira Fujita if (*moved_len) { 69827bc446eSbrookxu ext4_discard_preallocations(orig_inode, 0); 69927bc446eSbrookxu ext4_discard_preallocations(donor_inode, 0); 70094d7c16cSAkira Fujita } 70194d7c16cSAkira Fujita 7027ff5fddaSYe Bin ext4_free_ext_path(path); 703393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 704375e289eSJ. Bruce Fields unlock_two_nondirectories(orig_inode, donor_inode); 705748de673SAkira Fujita 70603bd8b9bSDmitry Monakhov return ret; 707748de673SAkira Fujita } 708