1748de673SAkira Fujita /* 2748de673SAkira Fujita * Copyright (c) 2008,2009 NEC Software Tohoku, Ltd. 3748de673SAkira Fujita * Written by Takashi Sato <t-sato@yk.jp.nec.com> 4748de673SAkira Fujita * Akira Fujita <a-fujita@rs.jp.nec.com> 5748de673SAkira Fujita * 6748de673SAkira Fujita * This program is free software; you can redistribute it and/or modify it 7748de673SAkira Fujita * under the terms of version 2.1 of the GNU Lesser General Public License 8748de673SAkira Fujita * as published by the Free Software Foundation. 9748de673SAkira Fujita * 10748de673SAkira Fujita * This program is distributed in the hope that it will be useful, 11748de673SAkira Fujita * but WITHOUT ANY WARRANTY; without even the implied warranty of 12748de673SAkira Fujita * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13748de673SAkira Fujita * GNU General Public License for more details. 14748de673SAkira Fujita */ 15748de673SAkira Fujita 16748de673SAkira Fujita #include <linux/fs.h> 17748de673SAkira Fujita #include <linux/quotaops.h> 185a0e3ad6STejun Heo #include <linux/slab.h> 19748de673SAkira Fujita #include "ext4_jbd2.h" 20748de673SAkira Fujita #include "ext4.h" 214a092d73STheodore Ts'o #include "ext4_extents.h" 22748de673SAkira Fujita 23e8505970SAkira Fujita /** 24e8505970SAkira Fujita * get_ext_path - Find an extent path for designated logical block number. 25e8505970SAkira Fujita * 26e8505970SAkira Fujita * @inode: an inode which is searched 27e8505970SAkira Fujita * @lblock: logical block number to find an extent path 28e8505970SAkira Fujita * @path: pointer to an extent path pointer (for output) 29e8505970SAkira Fujita * 30ed8a1a76STheodore Ts'o * ext4_find_extent wrapper. Return 0 on success, or a negative error value 31e8505970SAkira Fujita * on failure. 32e8505970SAkira Fujita */ 33e8505970SAkira Fujita static inline int 34e8505970SAkira Fujita get_ext_path(struct inode *inode, ext4_lblk_t lblock, 353bdf14b4STheodore Ts'o struct ext4_ext_path **ppath) 36e8505970SAkira Fujita { 370e401101SDmitry Monakhov struct ext4_ext_path *path; 38e8505970SAkira Fujita 39ed8a1a76STheodore Ts'o path = ext4_find_extent(inode, lblock, ppath, EXT4_EX_NOCACHE); 400e401101SDmitry Monakhov if (IS_ERR(path)) 413bdf14b4STheodore Ts'o return PTR_ERR(path); 423bdf14b4STheodore Ts'o if (path[ext_depth(inode)].p_ext == NULL) { 433bdf14b4STheodore Ts'o ext4_ext_drop_refs(path); 443bdf14b4STheodore Ts'o kfree(path); 453bdf14b4STheodore Ts'o *ppath = NULL; 463bdf14b4STheodore Ts'o return -ENODATA; 473bdf14b4STheodore Ts'o } 483bdf14b4STheodore Ts'o *ppath = path; 493bdf14b4STheodore Ts'o return 0; 50e8505970SAkira Fujita } 51748de673SAkira Fujita 52748de673SAkira Fujita /** 53393d1d1dSDr. Tilmann Bubeck * ext4_double_down_write_data_sem - Acquire two inodes' write lock 54393d1d1dSDr. Tilmann Bubeck * of i_data_sem 55748de673SAkira Fujita * 5603bd8b9bSDmitry Monakhov * Acquire write lock of i_data_sem of the two inodes 57748de673SAkira Fujita */ 58393d1d1dSDr. Tilmann Bubeck void 59393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(struct inode *first, struct inode *second) 60748de673SAkira Fujita { 6103bd8b9bSDmitry Monakhov if (first < second) { 62748de673SAkira Fujita down_write(&EXT4_I(first)->i_data_sem); 6349bd22bcSAkira Fujita down_write_nested(&EXT4_I(second)->i_data_sem, SINGLE_DEPTH_NESTING); 6403bd8b9bSDmitry Monakhov } else { 6503bd8b9bSDmitry Monakhov down_write(&EXT4_I(second)->i_data_sem); 6603bd8b9bSDmitry Monakhov down_write_nested(&EXT4_I(first)->i_data_sem, SINGLE_DEPTH_NESTING); 6703bd8b9bSDmitry Monakhov 6803bd8b9bSDmitry Monakhov } 69748de673SAkira Fujita } 70748de673SAkira Fujita 71748de673SAkira Fujita /** 72393d1d1dSDr. Tilmann Bubeck * ext4_double_up_write_data_sem - Release two inodes' write lock of i_data_sem 73748de673SAkira Fujita * 74748de673SAkira Fujita * @orig_inode: original inode structure to be released its lock first 75748de673SAkira Fujita * @donor_inode: donor inode structure to be released its lock second 76fc04cb49SAkira Fujita * Release write lock of i_data_sem of two inodes (orig and donor). 77748de673SAkira Fujita */ 78393d1d1dSDr. Tilmann Bubeck void 79393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(struct inode *orig_inode, 80393d1d1dSDr. Tilmann Bubeck struct inode *donor_inode) 81748de673SAkira Fujita { 82748de673SAkira Fujita up_write(&EXT4_I(orig_inode)->i_data_sem); 83748de673SAkira Fujita up_write(&EXT4_I(donor_inode)->i_data_sem); 84748de673SAkira Fujita } 85748de673SAkira Fujita 86748de673SAkira Fujita /** 878c854473SDmitry Monakhov * mext_check_coverage - Check that all extents in range has the same type 888c854473SDmitry Monakhov * 898c854473SDmitry Monakhov * @inode: inode in question 908c854473SDmitry Monakhov * @from: block offset of inode 918c854473SDmitry Monakhov * @count: block count to be checked 92556615dcSLukas Czerner * @unwritten: extents expected to be unwritten 938c854473SDmitry Monakhov * @err: pointer to save error value 948c854473SDmitry Monakhov * 958c854473SDmitry Monakhov * Return 1 if all extents in range has expected type, and zero otherwise. 968c854473SDmitry Monakhov */ 978c854473SDmitry Monakhov static int 988c854473SDmitry Monakhov mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count, 99556615dcSLukas Czerner int unwritten, int *err) 1008c854473SDmitry Monakhov { 1018c854473SDmitry Monakhov struct ext4_ext_path *path = NULL; 1028c854473SDmitry Monakhov struct ext4_extent *ext; 1030e401101SDmitry Monakhov int ret = 0; 1048c854473SDmitry Monakhov ext4_lblk_t last = from + count; 1058c854473SDmitry Monakhov while (from < last) { 1068c854473SDmitry Monakhov *err = get_ext_path(inode, from, &path); 1078c854473SDmitry Monakhov if (*err) 1080e401101SDmitry Monakhov goto out; 1098c854473SDmitry Monakhov ext = path[ext_depth(inode)].p_ext; 110556615dcSLukas Czerner if (unwritten != ext4_ext_is_unwritten(ext)) 1110e401101SDmitry Monakhov goto out; 1128c854473SDmitry Monakhov from += ext4_ext_get_actual_len(ext); 1138c854473SDmitry Monakhov ext4_ext_drop_refs(path); 1148c854473SDmitry Monakhov } 1150e401101SDmitry Monakhov ret = 1; 1160e401101SDmitry Monakhov out: 1170e401101SDmitry Monakhov ext4_ext_drop_refs(path); 1180e401101SDmitry Monakhov kfree(path); 1190e401101SDmitry Monakhov return ret; 1208c854473SDmitry Monakhov } 1218c854473SDmitry Monakhov 1228c854473SDmitry Monakhov /** 123748de673SAkira Fujita * mext_replace_branches - Replace original extents with new extents 124748de673SAkira Fujita * 125748de673SAkira Fujita * @handle: journal handle 126748de673SAkira Fujita * @orig_inode: original inode 127748de673SAkira Fujita * @donor_inode: donor inode 128748de673SAkira Fujita * @from: block offset of orig_inode 129748de673SAkira Fujita * @count: block count to be replaced 130f868a48dSAkira Fujita * @err: pointer to save return value 131748de673SAkira Fujita * 132748de673SAkira Fujita * Replace original inode extents and donor inode extents page by page. 133748de673SAkira Fujita * We implement this replacement in the following three steps: 134748de673SAkira Fujita * 1. Save the block information of original and donor inodes into 135748de673SAkira Fujita * dummy extents. 136748de673SAkira Fujita * 2. Change the block information of original inode to point at the 137748de673SAkira Fujita * donor inode blocks. 138748de673SAkira Fujita * 3. Change the block information of donor inode to point at the saved 139748de673SAkira Fujita * original inode blocks in the dummy extents. 140748de673SAkira Fujita * 141f868a48dSAkira Fujita * Return replaced block count. 142748de673SAkira Fujita */ 143748de673SAkira Fujita 144748de673SAkira Fujita /** 145bb557488SDmitry Monakhov * mext_page_double_lock - Grab and lock pages on both @inode1 and @inode2 146bb557488SDmitry Monakhov * 147bb557488SDmitry Monakhov * @inode1: the inode structure 148bb557488SDmitry Monakhov * @inode2: the inode structure 149bb557488SDmitry Monakhov * @index: page index 150bb557488SDmitry Monakhov * @page: result page vector 151bb557488SDmitry Monakhov * 152bb557488SDmitry Monakhov * Grab two locked pages for inode's by inode order 153bb557488SDmitry Monakhov */ 154bb557488SDmitry Monakhov static int 155bb557488SDmitry Monakhov mext_page_double_lock(struct inode *inode1, struct inode *inode2, 156fcf6b1b7SDmitry Monakhov pgoff_t index1, pgoff_t index2, struct page *page[2]) 157bb557488SDmitry Monakhov { 158bb557488SDmitry Monakhov struct address_space *mapping[2]; 159bb557488SDmitry Monakhov unsigned fl = AOP_FLAG_NOFS; 160bb557488SDmitry Monakhov 161bb557488SDmitry Monakhov BUG_ON(!inode1 || !inode2); 162bb557488SDmitry Monakhov if (inode1 < inode2) { 163bb557488SDmitry Monakhov mapping[0] = inode1->i_mapping; 164bb557488SDmitry Monakhov mapping[1] = inode2->i_mapping; 165bb557488SDmitry Monakhov } else { 166fcf6b1b7SDmitry Monakhov pgoff_t tmp = index1; 167fcf6b1b7SDmitry Monakhov index1 = index2; 168fcf6b1b7SDmitry Monakhov index2 = tmp; 169bb557488SDmitry Monakhov mapping[0] = inode2->i_mapping; 170bb557488SDmitry Monakhov mapping[1] = inode1->i_mapping; 171bb557488SDmitry Monakhov } 172bb557488SDmitry Monakhov 173fcf6b1b7SDmitry Monakhov page[0] = grab_cache_page_write_begin(mapping[0], index1, fl); 174bb557488SDmitry Monakhov if (!page[0]) 175bb557488SDmitry Monakhov return -ENOMEM; 176bb557488SDmitry Monakhov 177fcf6b1b7SDmitry Monakhov page[1] = grab_cache_page_write_begin(mapping[1], index2, fl); 178bb557488SDmitry Monakhov if (!page[1]) { 179bb557488SDmitry Monakhov unlock_page(page[0]); 180bb557488SDmitry Monakhov page_cache_release(page[0]); 181bb557488SDmitry Monakhov return -ENOMEM; 182bb557488SDmitry Monakhov } 1837e8b12c6SDmitry Monakhov /* 1847e8b12c6SDmitry Monakhov * grab_cache_page_write_begin() may not wait on page's writeback if 1857e8b12c6SDmitry Monakhov * BDI not demand that. But it is reasonable to be very conservative 1867e8b12c6SDmitry Monakhov * here and explicitly wait on page's writeback 1877e8b12c6SDmitry Monakhov */ 1887e8b12c6SDmitry Monakhov wait_on_page_writeback(page[0]); 1897e8b12c6SDmitry Monakhov wait_on_page_writeback(page[1]); 190bb557488SDmitry Monakhov if (inode1 > inode2) { 191bb557488SDmitry Monakhov struct page *tmp; 192bb557488SDmitry Monakhov tmp = page[0]; 193bb557488SDmitry Monakhov page[0] = page[1]; 194bb557488SDmitry Monakhov page[1] = tmp; 195bb557488SDmitry Monakhov } 196bb557488SDmitry Monakhov return 0; 197bb557488SDmitry Monakhov } 198bb557488SDmitry Monakhov 199bb557488SDmitry Monakhov /* Force page buffers uptodate w/o dropping page's lock */ 200bb557488SDmitry Monakhov static int 201bb557488SDmitry Monakhov mext_page_mkuptodate(struct page *page, unsigned from, unsigned to) 202bb557488SDmitry Monakhov { 203bb557488SDmitry Monakhov struct inode *inode = page->mapping->host; 204bb557488SDmitry Monakhov sector_t block; 205bb557488SDmitry Monakhov struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE]; 206bb557488SDmitry Monakhov unsigned int blocksize, block_start, block_end; 207bb557488SDmitry Monakhov int i, err, nr = 0, partial = 0; 208bb557488SDmitry Monakhov BUG_ON(!PageLocked(page)); 209bb557488SDmitry Monakhov BUG_ON(PageWriteback(page)); 210bb557488SDmitry Monakhov 211bb557488SDmitry Monakhov if (PageUptodate(page)) 212bb557488SDmitry Monakhov return 0; 213bb557488SDmitry Monakhov 214bb557488SDmitry Monakhov blocksize = 1 << inode->i_blkbits; 215bb557488SDmitry Monakhov if (!page_has_buffers(page)) 216bb557488SDmitry Monakhov create_empty_buffers(page, blocksize, 0); 217bb557488SDmitry Monakhov 218bb557488SDmitry Monakhov head = page_buffers(page); 219bb557488SDmitry Monakhov block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); 220bb557488SDmitry Monakhov for (bh = head, block_start = 0; bh != head || !block_start; 221bb557488SDmitry Monakhov block++, block_start = block_end, bh = bh->b_this_page) { 222bb557488SDmitry Monakhov block_end = block_start + blocksize; 223bb557488SDmitry Monakhov if (block_end <= from || block_start >= to) { 224bb557488SDmitry Monakhov if (!buffer_uptodate(bh)) 225bb557488SDmitry Monakhov partial = 1; 226bb557488SDmitry Monakhov continue; 227bb557488SDmitry Monakhov } 228bb557488SDmitry Monakhov if (buffer_uptodate(bh)) 229bb557488SDmitry Monakhov continue; 230bb557488SDmitry Monakhov if (!buffer_mapped(bh)) { 231bb557488SDmitry Monakhov err = ext4_get_block(inode, block, bh, 0); 232bb557488SDmitry Monakhov if (err) { 233bb557488SDmitry Monakhov SetPageError(page); 234bb557488SDmitry Monakhov return err; 235bb557488SDmitry Monakhov } 236bb557488SDmitry Monakhov if (!buffer_mapped(bh)) { 237bb557488SDmitry Monakhov zero_user(page, block_start, blocksize); 238bb557488SDmitry Monakhov set_buffer_uptodate(bh); 239bb557488SDmitry Monakhov continue; 240bb557488SDmitry Monakhov } 241bb557488SDmitry Monakhov } 242bb557488SDmitry Monakhov BUG_ON(nr >= MAX_BUF_PER_PAGE); 243bb557488SDmitry Monakhov arr[nr++] = bh; 244bb557488SDmitry Monakhov } 245bb557488SDmitry Monakhov /* No io required */ 246bb557488SDmitry Monakhov if (!nr) 247bb557488SDmitry Monakhov goto out; 248bb557488SDmitry Monakhov 249bb557488SDmitry Monakhov for (i = 0; i < nr; i++) { 250bb557488SDmitry Monakhov bh = arr[i]; 251bb557488SDmitry Monakhov if (!bh_uptodate_or_lock(bh)) { 252bb557488SDmitry Monakhov err = bh_submit_read(bh); 253bb557488SDmitry Monakhov if (err) 254bb557488SDmitry Monakhov return err; 255bb557488SDmitry Monakhov } 256bb557488SDmitry Monakhov } 257bb557488SDmitry Monakhov out: 258bb557488SDmitry Monakhov if (!partial) 259bb557488SDmitry Monakhov SetPageUptodate(page); 260bb557488SDmitry Monakhov return 0; 261bb557488SDmitry Monakhov } 262bb557488SDmitry Monakhov 263bb557488SDmitry Monakhov /** 264748de673SAkira Fujita * move_extent_per_page - Move extent data per page 265748de673SAkira Fujita * 266748de673SAkira Fujita * @o_filp: file structure of original file 267748de673SAkira Fujita * @donor_inode: donor inode 268748de673SAkira Fujita * @orig_page_offset: page index on original file 269748de673SAkira Fujita * @data_offset_in_page: block index where data swapping starts 270748de673SAkira Fujita * @block_len_in_page: the number of blocks to be swapped 271556615dcSLukas Czerner * @unwritten: orig extent is unwritten or not 272f868a48dSAkira Fujita * @err: pointer to save return value 273748de673SAkira Fujita * 274748de673SAkira Fujita * Save the data in original inode blocks and replace original inode extents 275748de673SAkira Fujita * with donor inode extents by calling mext_replace_branches(). 276f868a48dSAkira Fujita * Finally, write out the saved data in new original inode blocks. Return 277f868a48dSAkira Fujita * replaced block count. 278748de673SAkira Fujita */ 279748de673SAkira Fujita static int 28044fc48f7SAkira Fujita move_extent_per_page(struct file *o_filp, struct inode *donor_inode, 281fcf6b1b7SDmitry Monakhov pgoff_t orig_page_offset, pgoff_t donor_page_offset, 282fcf6b1b7SDmitry Monakhov int data_offset_in_page, 283556615dcSLukas Czerner int block_len_in_page, int unwritten, int *err) 284748de673SAkira Fujita { 285496ad9aaSAl Viro struct inode *orig_inode = file_inode(o_filp); 286bb557488SDmitry Monakhov struct page *pagep[2] = {NULL, NULL}; 287748de673SAkira Fujita handle_t *handle; 288fcf6b1b7SDmitry Monakhov ext4_lblk_t orig_blk_offset, donor_blk_offset; 289748de673SAkira Fujita unsigned long blocksize = orig_inode->i_sb->s_blocksize; 290748de673SAkira Fujita unsigned int w_flags = 0; 291f868a48dSAkira Fujita unsigned int tmp_data_size, data_size, replaced_size; 292bb557488SDmitry Monakhov int err2, jblocks, retries = 0; 293f868a48dSAkira Fujita int replaced_count = 0; 294bb557488SDmitry Monakhov int from = data_offset_in_page << orig_inode->i_blkbits; 295748de673SAkira Fujita int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits; 296748de673SAkira Fujita 297748de673SAkira Fujita /* 298748de673SAkira Fujita * It needs twice the amount of ordinary journal buffers because 299748de673SAkira Fujita * inode and donor_inode may change each different metadata blocks. 300748de673SAkira Fujita */ 301bb557488SDmitry Monakhov again: 302bb557488SDmitry Monakhov *err = 0; 303748de673SAkira Fujita jblocks = ext4_writepage_trans_blocks(orig_inode) * 2; 3049924a92aSTheodore Ts'o handle = ext4_journal_start(orig_inode, EXT4_HT_MOVE_EXTENTS, jblocks); 305748de673SAkira Fujita if (IS_ERR(handle)) { 306f868a48dSAkira Fujita *err = PTR_ERR(handle); 307f868a48dSAkira Fujita return 0; 308748de673SAkira Fujita } 309748de673SAkira Fujita 310748de673SAkira Fujita if (segment_eq(get_fs(), KERNEL_DS)) 311748de673SAkira Fujita w_flags |= AOP_FLAG_UNINTERRUPTIBLE; 312748de673SAkira Fujita 313748de673SAkira Fujita orig_blk_offset = orig_page_offset * blocks_per_page + 314748de673SAkira Fujita data_offset_in_page; 315748de673SAkira Fujita 316fcf6b1b7SDmitry Monakhov donor_blk_offset = donor_page_offset * blocks_per_page + 317fcf6b1b7SDmitry Monakhov data_offset_in_page; 318fcf6b1b7SDmitry Monakhov 319f868a48dSAkira Fujita /* Calculate data_size */ 320748de673SAkira Fujita if ((orig_blk_offset + block_len_in_page - 1) == 321748de673SAkira Fujita ((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) { 322748de673SAkira Fujita /* Replace the last block */ 323f868a48dSAkira Fujita tmp_data_size = orig_inode->i_size & (blocksize - 1); 324748de673SAkira Fujita /* 325f868a48dSAkira Fujita * If data_size equal zero, it shows data_size is multiples of 326748de673SAkira Fujita * blocksize. So we set appropriate value. 327748de673SAkira Fujita */ 328f868a48dSAkira Fujita if (tmp_data_size == 0) 329f868a48dSAkira Fujita tmp_data_size = blocksize; 330748de673SAkira Fujita 331f868a48dSAkira Fujita data_size = tmp_data_size + 332748de673SAkira Fujita ((block_len_in_page - 1) << orig_inode->i_blkbits); 333f868a48dSAkira Fujita } else 334f868a48dSAkira Fujita data_size = block_len_in_page << orig_inode->i_blkbits; 335748de673SAkira Fujita 336f868a48dSAkira Fujita replaced_size = data_size; 337f868a48dSAkira Fujita 338bb557488SDmitry Monakhov *err = mext_page_double_lock(orig_inode, donor_inode, orig_page_offset, 339fcf6b1b7SDmitry Monakhov donor_page_offset, pagep); 340f868a48dSAkira Fujita if (unlikely(*err < 0)) 341bb557488SDmitry Monakhov goto stop_journal; 3428c854473SDmitry Monakhov /* 343556615dcSLukas Czerner * If orig extent was unwritten it can become initialized 3448c854473SDmitry Monakhov * at any time after i_data_sem was dropped, in order to 3458c854473SDmitry Monakhov * serialize with delalloc we have recheck extent while we 3468c854473SDmitry Monakhov * hold page's lock, if it is still the case data copy is not 3478c854473SDmitry Monakhov * necessary, just swap data blocks between orig and donor. 3488c854473SDmitry Monakhov */ 349556615dcSLukas Czerner if (unwritten) { 350393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode); 3518c854473SDmitry Monakhov /* If any of extents in range became initialized we have to 3528c854473SDmitry Monakhov * fallback to data copying */ 353556615dcSLukas Czerner unwritten = mext_check_coverage(orig_inode, orig_blk_offset, 3548c854473SDmitry Monakhov block_len_in_page, 1, err); 3558c854473SDmitry Monakhov if (*err) 3568c854473SDmitry Monakhov goto drop_data_sem; 357748de673SAkira Fujita 358fcf6b1b7SDmitry Monakhov unwritten &= mext_check_coverage(donor_inode, donor_blk_offset, 3598c854473SDmitry Monakhov block_len_in_page, 1, err); 3608c854473SDmitry Monakhov if (*err) 3618c854473SDmitry Monakhov goto drop_data_sem; 3628c854473SDmitry Monakhov 363556615dcSLukas Czerner if (!unwritten) { 364393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 3658c854473SDmitry Monakhov goto data_copy; 3668c854473SDmitry Monakhov } 3678c854473SDmitry Monakhov if ((page_has_private(pagep[0]) && 3688c854473SDmitry Monakhov !try_to_release_page(pagep[0], 0)) || 3698c854473SDmitry Monakhov (page_has_private(pagep[1]) && 3708c854473SDmitry Monakhov !try_to_release_page(pagep[1], 0))) { 3718c854473SDmitry Monakhov *err = -EBUSY; 3728c854473SDmitry Monakhov goto drop_data_sem; 3738c854473SDmitry Monakhov } 374fcf6b1b7SDmitry Monakhov replaced_count = ext4_swap_extents(handle, orig_inode, 3758c854473SDmitry Monakhov donor_inode, orig_blk_offset, 376fcf6b1b7SDmitry Monakhov donor_blk_offset, 377fcf6b1b7SDmitry Monakhov block_len_in_page, 1, err); 3788c854473SDmitry Monakhov drop_data_sem: 379393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 3808c854473SDmitry Monakhov goto unlock_pages; 3818c854473SDmitry Monakhov } 3828c854473SDmitry Monakhov data_copy: 383bb557488SDmitry Monakhov *err = mext_page_mkuptodate(pagep[0], from, from + replaced_size); 384bb557488SDmitry Monakhov if (*err) 385bb557488SDmitry Monakhov goto unlock_pages; 386bb557488SDmitry Monakhov 387bb557488SDmitry Monakhov /* At this point all buffers in range are uptodate, old mapping layout 388bb557488SDmitry Monakhov * is no longer required, try to drop it now. */ 389bb557488SDmitry Monakhov if ((page_has_private(pagep[0]) && !try_to_release_page(pagep[0], 0)) || 390bb557488SDmitry Monakhov (page_has_private(pagep[1]) && !try_to_release_page(pagep[1], 0))) { 391bb557488SDmitry Monakhov *err = -EBUSY; 392bb557488SDmitry Monakhov goto unlock_pages; 393748de673SAkira Fujita } 3946e263146SDmitry Monakhov ext4_double_down_write_data_sem(orig_inode, donor_inode); 395fcf6b1b7SDmitry Monakhov replaced_count = ext4_swap_extents(handle, orig_inode, donor_inode, 396fcf6b1b7SDmitry Monakhov orig_blk_offset, donor_blk_offset, 397fcf6b1b7SDmitry Monakhov block_len_in_page, 1, err); 3986e263146SDmitry Monakhov ext4_double_up_write_data_sem(orig_inode, donor_inode); 399bb557488SDmitry Monakhov if (*err) { 400f868a48dSAkira Fujita if (replaced_count) { 401f868a48dSAkira Fujita block_len_in_page = replaced_count; 402f868a48dSAkira Fujita replaced_size = 403f868a48dSAkira Fujita block_len_in_page << orig_inode->i_blkbits; 404ac48b0a1SAkira Fujita } else 405bb557488SDmitry Monakhov goto unlock_pages; 406f868a48dSAkira Fujita } 407bb557488SDmitry Monakhov /* Perform all necessary steps similar write_begin()/write_end() 408bb557488SDmitry Monakhov * but keeping in mind that i_size will not change */ 4097e8b12c6SDmitry Monakhov *err = __block_write_begin(pagep[0], from, replaced_size, 410bb557488SDmitry Monakhov ext4_get_block); 411bb557488SDmitry Monakhov if (!*err) 412bb557488SDmitry Monakhov *err = block_commit_write(pagep[0], from, from + replaced_size); 413fc04cb49SAkira Fujita 414bb557488SDmitry Monakhov if (unlikely(*err < 0)) 415bb557488SDmitry Monakhov goto repair_branches; 416748de673SAkira Fujita 417bb557488SDmitry Monakhov /* Even in case of data=writeback it is reasonable to pin 418bb557488SDmitry Monakhov * inode to transaction, to prevent unexpected data loss */ 419bb557488SDmitry Monakhov *err = ext4_jbd2_file_inode(handle, orig_inode); 420748de673SAkira Fujita 421bb557488SDmitry Monakhov unlock_pages: 422bb557488SDmitry Monakhov unlock_page(pagep[0]); 423bb557488SDmitry Monakhov page_cache_release(pagep[0]); 424bb557488SDmitry Monakhov unlock_page(pagep[1]); 425bb557488SDmitry Monakhov page_cache_release(pagep[1]); 426bb557488SDmitry Monakhov stop_journal: 42791cc219aSPeng Tao ext4_journal_stop(handle); 428bb557488SDmitry Monakhov /* Buffer was busy because probably is pinned to journal transaction, 429bb557488SDmitry Monakhov * force transaction commit may help to free it. */ 430bb557488SDmitry Monakhov if (*err == -EBUSY && ext4_should_retry_alloc(orig_inode->i_sb, 431bb557488SDmitry Monakhov &retries)) 432bb557488SDmitry Monakhov goto again; 433f868a48dSAkira Fujita return replaced_count; 434bb557488SDmitry Monakhov 435bb557488SDmitry Monakhov repair_branches: 436bb557488SDmitry Monakhov /* 437bb557488SDmitry Monakhov * This should never ever happen! 438bb557488SDmitry Monakhov * Extents are swapped already, but we are not able to copy data. 439bb557488SDmitry Monakhov * Try to swap extents to it's original places 440bb557488SDmitry Monakhov */ 441393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode); 442fcf6b1b7SDmitry Monakhov replaced_count = ext4_swap_extents(handle, donor_inode, orig_inode, 443fcf6b1b7SDmitry Monakhov orig_blk_offset, donor_blk_offset, 444fcf6b1b7SDmitry Monakhov block_len_in_page, 0, &err2); 445393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 446bb557488SDmitry Monakhov if (replaced_count != block_len_in_page) { 447bb557488SDmitry Monakhov EXT4_ERROR_INODE_BLOCK(orig_inode, (sector_t)(orig_blk_offset), 448bb557488SDmitry Monakhov "Unable to copy data block," 449bb557488SDmitry Monakhov " data will be lost."); 450bb557488SDmitry Monakhov *err = -EIO; 451bb557488SDmitry Monakhov } 452bb557488SDmitry Monakhov replaced_count = 0; 453bb557488SDmitry Monakhov goto unlock_pages; 454748de673SAkira Fujita } 455748de673SAkira Fujita 456748de673SAkira Fujita /** 457c437b273SAkira Fujita * mext_check_arguments - Check whether move extent can be done 458748de673SAkira Fujita * 459748de673SAkira Fujita * @orig_inode: original inode 460748de673SAkira Fujita * @donor_inode: donor inode 461748de673SAkira Fujita * @orig_start: logical start offset in block for orig 462748de673SAkira Fujita * @donor_start: logical start offset in block for donor 463748de673SAkira Fujita * @len: the number of blocks to be moved 464748de673SAkira Fujita * 465748de673SAkira Fujita * Check the arguments of ext4_move_extents() whether the files can be 466748de673SAkira Fujita * exchanged with each other. 467748de673SAkira Fujita * Return 0 on success, or a negative error value on failure. 468748de673SAkira Fujita */ 469748de673SAkira Fujita static int 470748de673SAkira Fujita mext_check_arguments(struct inode *orig_inode, 471748de673SAkira Fujita struct inode *donor_inode, __u64 orig_start, 472446aaa6eSKazuya Mio __u64 donor_start, __u64 *len) 473748de673SAkira Fujita { 474fcf6b1b7SDmitry Monakhov __u64 orig_eof, donor_eof; 47570d5d3dcSAkira Fujita unsigned int blkbits = orig_inode->i_blkbits; 47670d5d3dcSAkira Fujita unsigned int blocksize = 1 << blkbits; 47770d5d3dcSAkira Fujita 478fcf6b1b7SDmitry Monakhov orig_eof = (i_size_read(orig_inode) + blocksize - 1) >> blkbits; 479fcf6b1b7SDmitry Monakhov donor_eof = (i_size_read(donor_inode) + blocksize - 1) >> blkbits; 480fcf6b1b7SDmitry Monakhov 481fcf6b1b7SDmitry Monakhov 4824a58579bSAkira Fujita if (donor_inode->i_mode & (S_ISUID|S_ISGID)) { 4834a58579bSAkira Fujita ext4_debug("ext4 move extent: suid or sgid is set" 4844a58579bSAkira Fujita " to donor file [ino:orig %lu, donor %lu]\n", 4854a58579bSAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 4864a58579bSAkira Fujita return -EINVAL; 4874a58579bSAkira Fujita } 4884a58579bSAkira Fujita 4891f5a81e4STheodore Ts'o if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode)) 4901f5a81e4STheodore Ts'o return -EPERM; 4911f5a81e4STheodore Ts'o 492748de673SAkira Fujita /* Ext4 move extent does not support swapfile */ 493748de673SAkira Fujita if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) { 494748de673SAkira Fujita ext4_debug("ext4 move extent: The argument files should " 495748de673SAkira Fujita "not be swapfile [ino:orig %lu, donor %lu]\n", 496748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 497fcf6b1b7SDmitry Monakhov return -EBUSY; 498748de673SAkira Fujita } 499748de673SAkira Fujita 500748de673SAkira Fujita /* Ext4 move extent supports only extent based file */ 50112e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(orig_inode, EXT4_INODE_EXTENTS))) { 502748de673SAkira Fujita ext4_debug("ext4 move extent: orig file is not extents " 503748de673SAkira Fujita "based file [ino:orig %lu]\n", orig_inode->i_ino); 504748de673SAkira Fujita return -EOPNOTSUPP; 50512e9b892SDmitry Monakhov } else if (!(ext4_test_inode_flag(donor_inode, EXT4_INODE_EXTENTS))) { 506748de673SAkira Fujita ext4_debug("ext4 move extent: donor file is not extents " 507748de673SAkira Fujita "based file [ino:donor %lu]\n", donor_inode->i_ino); 508748de673SAkira Fujita return -EOPNOTSUPP; 509748de673SAkira Fujita } 510748de673SAkira Fujita 511748de673SAkira Fujita if ((!orig_inode->i_size) || (!donor_inode->i_size)) { 512748de673SAkira Fujita ext4_debug("ext4 move extent: File size is 0 byte\n"); 513748de673SAkira Fujita return -EINVAL; 514748de673SAkira Fujita } 515748de673SAkira Fujita 516748de673SAkira Fujita /* Start offset should be same */ 517fcf6b1b7SDmitry Monakhov if ((orig_start & ~(PAGE_MASK >> orig_inode->i_blkbits)) != 518fcf6b1b7SDmitry Monakhov (donor_start & ~(PAGE_MASK >> orig_inode->i_blkbits))) { 519748de673SAkira Fujita ext4_debug("ext4 move extent: orig and donor's start " 520fcf6b1b7SDmitry Monakhov "offset are not alligned [ino:orig %lu, donor %lu]\n", 521748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 522748de673SAkira Fujita return -EINVAL; 523748de673SAkira Fujita } 524748de673SAkira Fujita 525f17722f9SLukas Czerner if ((orig_start >= EXT_MAX_BLOCKS) || 526fcf6b1b7SDmitry Monakhov (donor_start >= EXT_MAX_BLOCKS) || 527f17722f9SLukas Czerner (*len > EXT_MAX_BLOCKS) || 528fcf6b1b7SDmitry Monakhov (donor_start + *len >= EXT_MAX_BLOCKS) || 529f17722f9SLukas Czerner (orig_start + *len >= EXT_MAX_BLOCKS)) { 5300a80e986SEric Sandeen ext4_debug("ext4 move extent: Can't handle over [%u] blocks " 531f17722f9SLukas Czerner "[ino:orig %lu, donor %lu]\n", EXT_MAX_BLOCKS, 532748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 533748de673SAkira Fujita return -EINVAL; 534748de673SAkira Fujita } 535fcf6b1b7SDmitry Monakhov if (orig_eof < orig_start + *len - 1) 536fcf6b1b7SDmitry Monakhov *len = orig_eof - orig_start; 537fcf6b1b7SDmitry Monakhov if (donor_eof < donor_start + *len - 1) 538fcf6b1b7SDmitry Monakhov *len = donor_eof - donor_start; 539748de673SAkira Fujita if (!*len) { 54092c28159SAkira Fujita ext4_debug("ext4 move extent: len should not be 0 " 541748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", orig_inode->i_ino, 542748de673SAkira Fujita donor_inode->i_ino); 543748de673SAkira Fujita return -EINVAL; 544748de673SAkira Fujita } 545748de673SAkira Fujita 546748de673SAkira Fujita return 0; 547748de673SAkira Fujita } 548748de673SAkira Fujita 549748de673SAkira Fujita /** 550748de673SAkira Fujita * ext4_move_extents - Exchange the specified range of a file 551748de673SAkira Fujita * 552748de673SAkira Fujita * @o_filp: file structure of the original file 553748de673SAkira Fujita * @d_filp: file structure of the donor file 554748de673SAkira Fujita * @orig_start: start offset in block for orig 555748de673SAkira Fujita * @donor_start: start offset in block for donor 556748de673SAkira Fujita * @len: the number of blocks to be moved 557748de673SAkira Fujita * @moved_len: moved block length 558748de673SAkira Fujita * 559748de673SAkira Fujita * This function returns 0 and moved block length is set in moved_len 560748de673SAkira Fujita * if succeed, otherwise returns error value. 561748de673SAkira Fujita * 562748de673SAkira Fujita * Note: ext4_move_extents() proceeds the following order. 563748de673SAkira Fujita * 1:ext4_move_extents() calculates the last block number of moving extent 564748de673SAkira Fujita * function by the start block number (orig_start) and the number of blocks 565748de673SAkira Fujita * to be moved (len) specified as arguments. 566748de673SAkira Fujita * If the {orig, donor}_start points a hole, the extent's start offset 567748de673SAkira Fujita * pointed by ext_cur (current extent), holecheck_path, orig_path are set 568748de673SAkira Fujita * after hole behind. 569748de673SAkira Fujita * 2:Continue step 3 to step 5, until the holecheck_path points to last_extent 570748de673SAkira Fujita * or the ext_cur exceeds the block_end which is last logical block number. 571748de673SAkira Fujita * 3:To get the length of continues area, call mext_next_extent() 572748de673SAkira Fujita * specified with the ext_cur (initial value is holecheck_path) re-cursive, 573748de673SAkira Fujita * until find un-continuous extent, the start logical block number exceeds 574748de673SAkira Fujita * the block_end or the extent points to the last extent. 575748de673SAkira Fujita * 4:Exchange the original inode data with donor inode data 576748de673SAkira Fujita * from orig_page_offset to seq_end_page. 577748de673SAkira Fujita * The start indexes of data are specified as arguments. 578748de673SAkira Fujita * That of the original inode is orig_page_offset, 579748de673SAkira Fujita * and the donor inode is also orig_page_offset 580748de673SAkira Fujita * (To easily handle blocksize != pagesize case, the offset for the 581748de673SAkira Fujita * donor inode is block unit). 582748de673SAkira Fujita * 5:Update holecheck_path and orig_path to points a next proceeding extent, 583748de673SAkira Fujita * then returns to step 2. 584748de673SAkira Fujita * 6:Release holecheck_path, orig_path and set the len to moved_len 585748de673SAkira Fujita * which shows the number of moved blocks. 586748de673SAkira Fujita * The moved_len is useful for the command to calculate the file offset 587748de673SAkira Fujita * for starting next move extent ioctl. 588748de673SAkira Fujita * 7:Return 0 on success, or a negative error value on failure. 589748de673SAkira Fujita */ 590748de673SAkira Fujita int 591fcf6b1b7SDmitry Monakhov ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk, 592fcf6b1b7SDmitry Monakhov __u64 donor_blk, __u64 len, __u64 *moved_len) 593748de673SAkira Fujita { 594496ad9aaSAl Viro struct inode *orig_inode = file_inode(o_filp); 595496ad9aaSAl Viro struct inode *donor_inode = file_inode(d_filp); 596fcf6b1b7SDmitry Monakhov struct ext4_ext_path *path = NULL; 597748de673SAkira Fujita int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits; 598fcf6b1b7SDmitry Monakhov ext4_lblk_t o_end, o_start = orig_blk; 599fcf6b1b7SDmitry Monakhov ext4_lblk_t d_start = donor_blk; 600fcf6b1b7SDmitry Monakhov int ret; 601748de673SAkira Fujita 60203bd8b9bSDmitry Monakhov if (orig_inode->i_sb != donor_inode->i_sb) { 60303bd8b9bSDmitry Monakhov ext4_debug("ext4 move extent: The argument files " 60403bd8b9bSDmitry Monakhov "should be in same FS [ino:orig %lu, donor %lu]\n", 60503bd8b9bSDmitry Monakhov orig_inode->i_ino, donor_inode->i_ino); 60603bd8b9bSDmitry Monakhov return -EINVAL; 60703bd8b9bSDmitry Monakhov } 60803bd8b9bSDmitry Monakhov 60903bd8b9bSDmitry Monakhov /* orig and donor should be different inodes */ 61003bd8b9bSDmitry Monakhov if (orig_inode == donor_inode) { 611f3ce8064STheodore Ts'o ext4_debug("ext4 move extent: The argument files should not " 61203bd8b9bSDmitry Monakhov "be same inode [ino:orig %lu, donor %lu]\n", 613f3ce8064STheodore Ts'o orig_inode->i_ino, donor_inode->i_ino); 614f3ce8064STheodore Ts'o return -EINVAL; 615f3ce8064STheodore Ts'o } 616f3ce8064STheodore Ts'o 6177247c0caSAkira Fujita /* Regular file check */ 6187247c0caSAkira Fujita if (!S_ISREG(orig_inode->i_mode) || !S_ISREG(donor_inode->i_mode)) { 6197247c0caSAkira Fujita ext4_debug("ext4 move extent: The argument files should be " 6207247c0caSAkira Fujita "regular file [ino:orig %lu, donor %lu]\n", 6217247c0caSAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 6227247c0caSAkira Fujita return -EINVAL; 6237247c0caSAkira Fujita } 624f066055aSDmitry Monakhov /* TODO: This is non obvious task to swap blocks for inodes with full 625f066055aSDmitry Monakhov jornaling enabled */ 626f066055aSDmitry Monakhov if (ext4_should_journal_data(orig_inode) || 627f066055aSDmitry Monakhov ext4_should_journal_data(donor_inode)) { 628f066055aSDmitry Monakhov return -EINVAL; 629f066055aSDmitry Monakhov } 630fc04cb49SAkira Fujita /* Protect orig and donor inodes against a truncate */ 631375e289eSJ. Bruce Fields lock_two_nondirectories(orig_inode, donor_inode); 632748de673SAkira Fujita 63317335dccSDmitry Monakhov /* Wait for all existing dio workers */ 63417335dccSDmitry Monakhov ext4_inode_block_unlocked_dio(orig_inode); 63517335dccSDmitry Monakhov ext4_inode_block_unlocked_dio(donor_inode); 63617335dccSDmitry Monakhov inode_dio_wait(orig_inode); 63717335dccSDmitry Monakhov inode_dio_wait(donor_inode); 63817335dccSDmitry Monakhov 639fc04cb49SAkira Fujita /* Protect extent tree against block allocations via delalloc */ 640393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode); 641748de673SAkira Fujita /* Check the filesystem environment whether move_extent can be done */ 642fcf6b1b7SDmitry Monakhov ret = mext_check_arguments(orig_inode, donor_inode, orig_blk, 643fcf6b1b7SDmitry Monakhov donor_blk, &len); 64403bd8b9bSDmitry Monakhov if (ret) 645347fa6f1SAkira Fujita goto out; 646fcf6b1b7SDmitry Monakhov o_end = o_start + len; 647748de673SAkira Fujita 648fcf6b1b7SDmitry Monakhov while (o_start < o_end) { 649fcf6b1b7SDmitry Monakhov struct ext4_extent *ex; 650fcf6b1b7SDmitry Monakhov ext4_lblk_t cur_blk, next_blk; 651fcf6b1b7SDmitry Monakhov pgoff_t orig_page_index, donor_page_index; 652fcf6b1b7SDmitry Monakhov int offset_in_page; 653fcf6b1b7SDmitry Monakhov int unwritten, cur_len; 654748de673SAkira Fujita 655fcf6b1b7SDmitry Monakhov ret = get_ext_path(orig_inode, o_start, &path); 65603bd8b9bSDmitry Monakhov if (ret) 657347fa6f1SAkira Fujita goto out; 658fcf6b1b7SDmitry Monakhov ex = path[path->p_depth].p_ext; 659fcf6b1b7SDmitry Monakhov next_blk = ext4_ext_next_allocated_block(path); 660fcf6b1b7SDmitry Monakhov cur_blk = le32_to_cpu(ex->ee_block); 661fcf6b1b7SDmitry Monakhov cur_len = ext4_ext_get_actual_len(ex); 662fcf6b1b7SDmitry Monakhov /* Check hole before the start pos */ 663fcf6b1b7SDmitry Monakhov if (cur_blk + cur_len - 1 < o_start) { 664fcf6b1b7SDmitry Monakhov if (next_blk == EXT_MAX_BLOCKS) { 665fcf6b1b7SDmitry Monakhov o_start = o_end; 666fcf6b1b7SDmitry Monakhov ret = -ENODATA; 667748de673SAkira Fujita goto out; 668748de673SAkira Fujita } 669fcf6b1b7SDmitry Monakhov d_start += next_blk - o_start; 670fcf6b1b7SDmitry Monakhov o_start = next_blk; 6713bdf14b4STheodore Ts'o continue; 672fcf6b1b7SDmitry Monakhov /* Check hole after the start pos */ 673fcf6b1b7SDmitry Monakhov } else if (cur_blk > o_start) { 674fcf6b1b7SDmitry Monakhov /* Skip hole */ 675fcf6b1b7SDmitry Monakhov d_start += cur_blk - o_start; 676fcf6b1b7SDmitry Monakhov o_start = cur_blk; 677fcf6b1b7SDmitry Monakhov /* Extent inside requested range ?*/ 678fcf6b1b7SDmitry Monakhov if (cur_blk >= o_end) 679748de673SAkira Fujita goto out; 680fcf6b1b7SDmitry Monakhov } else { /* in_range(o_start, o_blk, o_len) */ 681fcf6b1b7SDmitry Monakhov cur_len += cur_blk - o_start; 682748de673SAkira Fujita } 683fcf6b1b7SDmitry Monakhov unwritten = ext4_ext_is_unwritten(ex); 684fcf6b1b7SDmitry Monakhov if (o_end - o_start < cur_len) 685fcf6b1b7SDmitry Monakhov cur_len = o_end - o_start; 686748de673SAkira Fujita 687fcf6b1b7SDmitry Monakhov orig_page_index = o_start >> (PAGE_CACHE_SHIFT - 688fcf6b1b7SDmitry Monakhov orig_inode->i_blkbits); 689fcf6b1b7SDmitry Monakhov donor_page_index = d_start >> (PAGE_CACHE_SHIFT - 690fcf6b1b7SDmitry Monakhov donor_inode->i_blkbits); 691fcf6b1b7SDmitry Monakhov offset_in_page = o_start % blocks_per_page; 692fcf6b1b7SDmitry Monakhov if (cur_len > blocks_per_page- offset_in_page) 693fcf6b1b7SDmitry Monakhov cur_len = blocks_per_page - offset_in_page; 694fc04cb49SAkira Fujita /* 695fc04cb49SAkira Fujita * Up semaphore to avoid following problems: 696fc04cb49SAkira Fujita * a. transaction deadlock among ext4_journal_start, 697fc04cb49SAkira Fujita * ->write_begin via pagefault, and jbd2_journal_commit 698fc04cb49SAkira Fujita * b. racing with ->readpage, ->write_begin, and ext4_get_block 699fc04cb49SAkira Fujita * in move_extent_per_page 700fc04cb49SAkira Fujita */ 701393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 702748de673SAkira Fujita /* Swap original branches with new branches */ 703fcf6b1b7SDmitry Monakhov move_extent_per_page(o_filp, donor_inode, 704fcf6b1b7SDmitry Monakhov orig_page_index, donor_page_index, 705fcf6b1b7SDmitry Monakhov offset_in_page, cur_len, 706556615dcSLukas Czerner unwritten, &ret); 707393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode); 70803bd8b9bSDmitry Monakhov if (ret < 0) 709fc04cb49SAkira Fujita break; 710fcf6b1b7SDmitry Monakhov o_start += cur_len; 711fcf6b1b7SDmitry Monakhov d_start += cur_len; 712748de673SAkira Fujita } 713fcf6b1b7SDmitry Monakhov *moved_len = o_start - orig_blk; 714fcf6b1b7SDmitry Monakhov if (*moved_len > len) 715fcf6b1b7SDmitry Monakhov *moved_len = len; 716fcf6b1b7SDmitry Monakhov 717748de673SAkira Fujita out: 71894d7c16cSAkira Fujita if (*moved_len) { 71994d7c16cSAkira Fujita ext4_discard_preallocations(orig_inode); 72094d7c16cSAkira Fujita ext4_discard_preallocations(donor_inode); 72194d7c16cSAkira Fujita } 72294d7c16cSAkira Fujita 723fcf6b1b7SDmitry Monakhov ext4_ext_drop_refs(path); 724fcf6b1b7SDmitry Monakhov kfree(path); 725393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 72617335dccSDmitry Monakhov ext4_inode_resume_unlocked_dio(orig_inode); 72717335dccSDmitry Monakhov ext4_inode_resume_unlocked_dio(donor_inode); 728375e289eSJ. Bruce Fields unlock_two_nondirectories(orig_inode, donor_inode); 729748de673SAkira Fujita 73003bd8b9bSDmitry Monakhov return ret; 731748de673SAkira Fujita } 732