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
get_ext_path(struct inode * inode,ext4_lblk_t lblock,struct ext4_ext_path ** ppath)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
ext4_double_down_write_data_sem(struct inode * first,struct inode * second)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
ext4_double_up_write_data_sem(struct inode * orig_inode,struct inode * donor_inode)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
mext_check_coverage(struct inode * inode,ext4_lblk_t from,ext4_lblk_t count,int unwritten,int * err)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
mext_folio_double_lock(struct inode * inode1,struct inode * inode2,pgoff_t index1,pgoff_t index2,struct folio * folio[2])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;
129bb557488SDmitry Monakhov
130bb557488SDmitry Monakhov BUG_ON(!inode1 || !inode2);
131bb557488SDmitry Monakhov if (inode1 < inode2) {
132bb557488SDmitry Monakhov mapping[0] = inode1->i_mapping;
133bb557488SDmitry Monakhov mapping[1] = inode2->i_mapping;
134bb557488SDmitry Monakhov } else {
13562bbdd99SGustavo A. R. Silva swap(index1, index2);
136bb557488SDmitry Monakhov mapping[0] = inode2->i_mapping;
137bb557488SDmitry Monakhov mapping[1] = inode1->i_mapping;
138bb557488SDmitry Monakhov }
139bb557488SDmitry Monakhov
1408f50c8b7SMatthew Wilcox (Oracle) flags = memalloc_nofs_save();
141e999a5c5SMatthew Wilcox folio[0] = __filemap_get_folio(mapping[0], index1, FGP_WRITEBEGIN,
142e8dfc854SVishal Moola (Oracle) mapping_gfp_mask(mapping[0]));
14366dabbb6SChristoph Hellwig if (IS_ERR(folio[0])) {
1448f50c8b7SMatthew Wilcox (Oracle) memalloc_nofs_restore(flags);
14566dabbb6SChristoph Hellwig return PTR_ERR(folio[0]);
1468f50c8b7SMatthew Wilcox (Oracle) }
147bb557488SDmitry Monakhov
148e999a5c5SMatthew Wilcox folio[1] = __filemap_get_folio(mapping[1], index2, FGP_WRITEBEGIN,
149e8dfc854SVishal Moola (Oracle) mapping_gfp_mask(mapping[1]));
1508f50c8b7SMatthew Wilcox (Oracle) memalloc_nofs_restore(flags);
15166dabbb6SChristoph Hellwig if (IS_ERR(folio[1])) {
152e8dfc854SVishal Moola (Oracle) folio_unlock(folio[0]);
153e8dfc854SVishal Moola (Oracle) folio_put(folio[0]);
15466dabbb6SChristoph Hellwig return PTR_ERR(folio[1]);
155bb557488SDmitry Monakhov }
1567e8b12c6SDmitry Monakhov /*
157e8dfc854SVishal Moola (Oracle) * __filemap_get_folio() may not wait on folio's writeback if
1587e8b12c6SDmitry Monakhov * BDI not demand that. But it is reasonable to be very conservative
159e8dfc854SVishal Moola (Oracle) * here and explicitly wait on folio's writeback
1607e8b12c6SDmitry Monakhov */
161e8dfc854SVishal Moola (Oracle) folio_wait_writeback(folio[0]);
162e8dfc854SVishal Moola (Oracle) folio_wait_writeback(folio[1]);
163bf865467SFabian Frederick if (inode1 > inode2)
164e8dfc854SVishal Moola (Oracle) swap(folio[0], folio[1]);
165bf865467SFabian Frederick
166bb557488SDmitry Monakhov return 0;
167bb557488SDmitry Monakhov }
168bb557488SDmitry Monakhov
169bb557488SDmitry Monakhov /* Force page buffers uptodate w/o dropping page's lock */
170bb557488SDmitry Monakhov static int
mext_page_mkuptodate(struct folio * folio,unsigned from,unsigned to)1713060b6efSMatthew Wilcox mext_page_mkuptodate(struct folio *folio, unsigned from, unsigned to)
172bb557488SDmitry Monakhov {
1733060b6efSMatthew Wilcox struct inode *inode = folio->mapping->host;
174bb557488SDmitry Monakhov sector_t block;
175bb557488SDmitry Monakhov struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE];
176bb557488SDmitry Monakhov unsigned int blocksize, block_start, block_end;
177bb557488SDmitry Monakhov int i, err, nr = 0, partial = 0;
1783060b6efSMatthew Wilcox BUG_ON(!folio_test_locked(folio));
1793060b6efSMatthew Wilcox BUG_ON(folio_test_writeback(folio));
180bb557488SDmitry Monakhov
1813060b6efSMatthew Wilcox if (folio_test_uptodate(folio))
182bb557488SDmitry Monakhov return 0;
183bb557488SDmitry Monakhov
18493407472SFabian Frederick blocksize = i_blocksize(inode);
1853060b6efSMatthew Wilcox head = folio_buffers(folio);
1863060b6efSMatthew Wilcox if (!head) {
1873060b6efSMatthew Wilcox create_empty_buffers(&folio->page, blocksize, 0);
1883060b6efSMatthew Wilcox head = folio_buffers(folio);
1893060b6efSMatthew Wilcox }
190bb557488SDmitry Monakhov
1913060b6efSMatthew Wilcox block = (sector_t)folio->index << (PAGE_SHIFT - inode->i_blkbits);
192bb557488SDmitry Monakhov for (bh = head, block_start = 0; bh != head || !block_start;
193bb557488SDmitry Monakhov block++, block_start = block_end, bh = bh->b_this_page) {
194bb557488SDmitry Monakhov block_end = block_start + blocksize;
195bb557488SDmitry Monakhov if (block_end <= from || block_start >= to) {
196bb557488SDmitry Monakhov if (!buffer_uptodate(bh))
197bb557488SDmitry Monakhov partial = 1;
198bb557488SDmitry Monakhov continue;
199bb557488SDmitry Monakhov }
200bb557488SDmitry Monakhov if (buffer_uptodate(bh))
201bb557488SDmitry Monakhov continue;
202bb557488SDmitry Monakhov if (!buffer_mapped(bh)) {
203bb557488SDmitry Monakhov err = ext4_get_block(inode, block, bh, 0);
204bb557488SDmitry Monakhov if (err) {
2053060b6efSMatthew Wilcox folio_set_error(folio);
206bb557488SDmitry Monakhov return err;
207bb557488SDmitry Monakhov }
208bb557488SDmitry Monakhov if (!buffer_mapped(bh)) {
2093060b6efSMatthew Wilcox folio_zero_range(folio, block_start, blocksize);
210bb557488SDmitry Monakhov set_buffer_uptodate(bh);
211bb557488SDmitry Monakhov continue;
212bb557488SDmitry Monakhov }
213bb557488SDmitry Monakhov }
214bb557488SDmitry Monakhov BUG_ON(nr >= MAX_BUF_PER_PAGE);
215bb557488SDmitry Monakhov arr[nr++] = bh;
216bb557488SDmitry Monakhov }
217bb557488SDmitry Monakhov /* No io required */
218bb557488SDmitry Monakhov if (!nr)
219bb557488SDmitry Monakhov goto out;
220bb557488SDmitry Monakhov
221bb557488SDmitry Monakhov for (i = 0; i < nr; i++) {
222bb557488SDmitry Monakhov bh = arr[i];
223bb557488SDmitry Monakhov if (!bh_uptodate_or_lock(bh)) {
2242d069c08Szhangyi (F) err = ext4_read_bh(bh, 0, NULL);
225bb557488SDmitry Monakhov if (err)
226bb557488SDmitry Monakhov return err;
227bb557488SDmitry Monakhov }
228bb557488SDmitry Monakhov }
229bb557488SDmitry Monakhov out:
230bb557488SDmitry Monakhov if (!partial)
2313060b6efSMatthew Wilcox folio_mark_uptodate(folio);
232bb557488SDmitry Monakhov return 0;
233bb557488SDmitry Monakhov }
234bb557488SDmitry Monakhov
235bb557488SDmitry Monakhov /**
236748de673SAkira Fujita * move_extent_per_page - Move extent data per page
237748de673SAkira Fujita *
238748de673SAkira Fujita * @o_filp: file structure of original file
239748de673SAkira Fujita * @donor_inode: donor inode
240748de673SAkira Fujita * @orig_page_offset: page index on original file
24165dd8327SXiaoguang Wang * @donor_page_offset: page index on donor file
242748de673SAkira Fujita * @data_offset_in_page: block index where data swapping starts
243748de673SAkira Fujita * @block_len_in_page: the number of blocks to be swapped
244556615dcSLukas Czerner * @unwritten: orig extent is unwritten or not
245f868a48dSAkira Fujita * @err: pointer to save return value
246748de673SAkira Fujita *
247748de673SAkira Fujita * Save the data in original inode blocks and replace original inode extents
24865dd8327SXiaoguang Wang * with donor inode extents by calling ext4_swap_extents().
249f868a48dSAkira Fujita * Finally, write out the saved data in new original inode blocks. Return
250f868a48dSAkira Fujita * replaced block count.
251748de673SAkira Fujita */
252748de673SAkira Fujita static int
move_extent_per_page(struct file * o_filp,struct inode * donor_inode,pgoff_t orig_page_offset,pgoff_t donor_page_offset,int data_offset_in_page,int block_len_in_page,int unwritten,int * err)25344fc48f7SAkira Fujita move_extent_per_page(struct file *o_filp, struct inode *donor_inode,
254fcf6b1b7SDmitry Monakhov pgoff_t orig_page_offset, pgoff_t donor_page_offset,
255fcf6b1b7SDmitry Monakhov int data_offset_in_page,
256556615dcSLukas Czerner int block_len_in_page, int unwritten, int *err)
257748de673SAkira Fujita {
258496ad9aaSAl Viro struct inode *orig_inode = file_inode(o_filp);
2596dd8fe86SVishal Moola (Oracle) struct folio *folio[2] = {NULL, NULL};
260748de673SAkira Fujita handle_t *handle;
261fcf6b1b7SDmitry Monakhov ext4_lblk_t orig_blk_offset, donor_blk_offset;
262748de673SAkira Fujita unsigned long blocksize = orig_inode->i_sb->s_blocksize;
263f868a48dSAkira Fujita unsigned int tmp_data_size, data_size, replaced_size;
264bcff2488SEryu Guan int i, err2, jblocks, retries = 0;
265f868a48dSAkira Fujita int replaced_count = 0;
266bb557488SDmitry Monakhov int from = data_offset_in_page << orig_inode->i_blkbits;
26709cbfeafSKirill A. Shutemov int blocks_per_page = PAGE_SIZE >> orig_inode->i_blkbits;
26888c6b61fSDmitry Monakhov struct super_block *sb = orig_inode->i_sb;
269bcff2488SEryu Guan struct buffer_head *bh = NULL;
270748de673SAkira Fujita
271748de673SAkira Fujita /*
272748de673SAkira Fujita * It needs twice the amount of ordinary journal buffers because
273748de673SAkira Fujita * inode and donor_inode may change each different metadata blocks.
274748de673SAkira Fujita */
275bb557488SDmitry Monakhov again:
276bb557488SDmitry Monakhov *err = 0;
277748de673SAkira Fujita jblocks = ext4_writepage_trans_blocks(orig_inode) * 2;
2789924a92aSTheodore Ts'o handle = ext4_journal_start(orig_inode, EXT4_HT_MOVE_EXTENTS, jblocks);
279748de673SAkira Fujita if (IS_ERR(handle)) {
280f868a48dSAkira Fujita *err = PTR_ERR(handle);
281f868a48dSAkira Fujita return 0;
282748de673SAkira Fujita }
283748de673SAkira Fujita
284748de673SAkira Fujita orig_blk_offset = orig_page_offset * blocks_per_page +
285748de673SAkira Fujita data_offset_in_page;
286748de673SAkira Fujita
287fcf6b1b7SDmitry Monakhov donor_blk_offset = donor_page_offset * blocks_per_page +
288fcf6b1b7SDmitry Monakhov data_offset_in_page;
289fcf6b1b7SDmitry Monakhov
290f868a48dSAkira Fujita /* Calculate data_size */
291748de673SAkira Fujita if ((orig_blk_offset + block_len_in_page - 1) ==
292748de673SAkira Fujita ((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) {
293748de673SAkira Fujita /* Replace the last block */
294f868a48dSAkira Fujita tmp_data_size = orig_inode->i_size & (blocksize - 1);
295748de673SAkira Fujita /*
296f868a48dSAkira Fujita * If data_size equal zero, it shows data_size is multiples of
297748de673SAkira Fujita * blocksize. So we set appropriate value.
298748de673SAkira Fujita */
299f868a48dSAkira Fujita if (tmp_data_size == 0)
300f868a48dSAkira Fujita tmp_data_size = blocksize;
301748de673SAkira Fujita
302f868a48dSAkira Fujita data_size = tmp_data_size +
303748de673SAkira Fujita ((block_len_in_page - 1) << orig_inode->i_blkbits);
304f868a48dSAkira Fujita } else
305f868a48dSAkira Fujita data_size = block_len_in_page << orig_inode->i_blkbits;
306748de673SAkira Fujita
307f868a48dSAkira Fujita replaced_size = data_size;
308f868a48dSAkira Fujita
309e8dfc854SVishal Moola (Oracle) *err = mext_folio_double_lock(orig_inode, donor_inode, orig_page_offset,
310e8dfc854SVishal Moola (Oracle) donor_page_offset, folio);
311f868a48dSAkira Fujita if (unlikely(*err < 0))
312bb557488SDmitry Monakhov goto stop_journal;
3138c854473SDmitry Monakhov /*
314556615dcSLukas Czerner * If orig extent was unwritten it can become initialized
3158c854473SDmitry Monakhov * at any time after i_data_sem was dropped, in order to
3168c854473SDmitry Monakhov * serialize with delalloc we have recheck extent while we
3178c854473SDmitry Monakhov * hold page's lock, if it is still the case data copy is not
3188c854473SDmitry Monakhov * necessary, just swap data blocks between orig and donor.
3198c854473SDmitry Monakhov */
3206dd8fe86SVishal Moola (Oracle)
3216dd8fe86SVishal Moola (Oracle) VM_BUG_ON_FOLIO(folio_test_large(folio[0]), folio[0]);
3226dd8fe86SVishal Moola (Oracle) VM_BUG_ON_FOLIO(folio_test_large(folio[1]), folio[1]);
3236dd8fe86SVishal Moola (Oracle) VM_BUG_ON_FOLIO(folio_nr_pages(folio[0]) != folio_nr_pages(folio[1]), folio[1]);
3246dd8fe86SVishal Moola (Oracle)
325556615dcSLukas Czerner if (unwritten) {
326393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode);
3278c854473SDmitry Monakhov /* If any of extents in range became initialized we have to
3288c854473SDmitry Monakhov * fallback to data copying */
329556615dcSLukas Czerner unwritten = mext_check_coverage(orig_inode, orig_blk_offset,
3308c854473SDmitry Monakhov block_len_in_page, 1, err);
3318c854473SDmitry Monakhov if (*err)
3328c854473SDmitry Monakhov goto drop_data_sem;
333748de673SAkira Fujita
334fcf6b1b7SDmitry Monakhov unwritten &= mext_check_coverage(donor_inode, donor_blk_offset,
3358c854473SDmitry Monakhov block_len_in_page, 1, err);
3368c854473SDmitry Monakhov if (*err)
3378c854473SDmitry Monakhov goto drop_data_sem;
3388c854473SDmitry Monakhov
339556615dcSLukas Czerner if (!unwritten) {
340393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode);
3418c854473SDmitry Monakhov goto data_copy;
3428c854473SDmitry Monakhov }
3430201ebf2SDavid Howells if (!filemap_release_folio(folio[0], 0) ||
3440201ebf2SDavid Howells !filemap_release_folio(folio[1], 0)) {
3458c854473SDmitry Monakhov *err = -EBUSY;
3468c854473SDmitry Monakhov goto drop_data_sem;
3478c854473SDmitry Monakhov }
348fcf6b1b7SDmitry Monakhov replaced_count = ext4_swap_extents(handle, orig_inode,
3498c854473SDmitry Monakhov donor_inode, orig_blk_offset,
350fcf6b1b7SDmitry Monakhov donor_blk_offset,
351fcf6b1b7SDmitry Monakhov block_len_in_page, 1, err);
3528c854473SDmitry Monakhov drop_data_sem:
353393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode);
3546dd8fe86SVishal Moola (Oracle) goto unlock_folios;
3558c854473SDmitry Monakhov }
3568c854473SDmitry Monakhov data_copy:
3573060b6efSMatthew Wilcox *err = mext_page_mkuptodate(folio[0], from, from + replaced_size);
358bb557488SDmitry Monakhov if (*err)
3596dd8fe86SVishal Moola (Oracle) goto unlock_folios;
360bb557488SDmitry Monakhov
361bb557488SDmitry Monakhov /* At this point all buffers in range are uptodate, old mapping layout
362bb557488SDmitry Monakhov * is no longer required, try to drop it now. */
3630201ebf2SDavid Howells if (!filemap_release_folio(folio[0], 0) ||
3640201ebf2SDavid Howells !filemap_release_folio(folio[1], 0)) {
365bb557488SDmitry Monakhov *err = -EBUSY;
3666dd8fe86SVishal Moola (Oracle) goto unlock_folios;
367748de673SAkira Fujita }
3686e263146SDmitry Monakhov ext4_double_down_write_data_sem(orig_inode, donor_inode);
369fcf6b1b7SDmitry Monakhov replaced_count = ext4_swap_extents(handle, orig_inode, donor_inode,
370fcf6b1b7SDmitry Monakhov orig_blk_offset, donor_blk_offset,
371fcf6b1b7SDmitry Monakhov block_len_in_page, 1, err);
3726e263146SDmitry Monakhov ext4_double_up_write_data_sem(orig_inode, donor_inode);
373bb557488SDmitry Monakhov if (*err) {
374f868a48dSAkira Fujita if (replaced_count) {
375f868a48dSAkira Fujita block_len_in_page = replaced_count;
376f868a48dSAkira Fujita replaced_size =
377f868a48dSAkira Fujita block_len_in_page << orig_inode->i_blkbits;
378ac48b0a1SAkira Fujita } else
3796dd8fe86SVishal Moola (Oracle) goto unlock_folios;
380f868a48dSAkira Fujita }
381bb557488SDmitry Monakhov /* Perform all necessary steps similar write_begin()/write_end()
382bb557488SDmitry Monakhov * but keeping in mind that i_size will not change */
3836dd8fe86SVishal Moola (Oracle) if (!folio_buffers(folio[0]))
3846dd8fe86SVishal Moola (Oracle) create_empty_buffers(&folio[0]->page, 1 << orig_inode->i_blkbits, 0);
3856dd8fe86SVishal Moola (Oracle) bh = folio_buffers(folio[0]);
386bcff2488SEryu Guan for (i = 0; i < data_offset_in_page; i++)
387bcff2488SEryu Guan bh = bh->b_this_page;
388bcff2488SEryu Guan for (i = 0; i < block_len_in_page; i++) {
389bcff2488SEryu Guan *err = ext4_get_block(orig_inode, orig_blk_offset + i, bh, 0);
390bcff2488SEryu Guan if (*err < 0)
391a524fcfeSBean Huo goto repair_branches;
3926ffe77baSEryu Guan bh = bh->b_this_page;
393bcff2488SEryu Guan }
394fc04cb49SAkira Fujita
395a524fcfeSBean Huo block_commit_write(&folio[0]->page, from, from + replaced_size);
396748de673SAkira Fujita
397bb557488SDmitry Monakhov /* Even in case of data=writeback it is reasonable to pin
398bb557488SDmitry Monakhov * inode to transaction, to prevent unexpected data loss */
39973131fbbSRoss Zwisler *err = ext4_jbd2_inode_add_write(handle, orig_inode,
40073131fbbSRoss Zwisler (loff_t)orig_page_offset << PAGE_SHIFT, replaced_size);
401748de673SAkira Fujita
4026dd8fe86SVishal Moola (Oracle) unlock_folios:
4036dd8fe86SVishal Moola (Oracle) folio_unlock(folio[0]);
4046dd8fe86SVishal Moola (Oracle) folio_put(folio[0]);
4056dd8fe86SVishal Moola (Oracle) folio_unlock(folio[1]);
4066dd8fe86SVishal Moola (Oracle) folio_put(folio[1]);
407bb557488SDmitry Monakhov stop_journal:
40891cc219aSPeng Tao ext4_journal_stop(handle);
40988c6b61fSDmitry Monakhov if (*err == -ENOSPC &&
41088c6b61fSDmitry Monakhov ext4_should_retry_alloc(sb, &retries))
41188c6b61fSDmitry Monakhov goto again;
412bb557488SDmitry Monakhov /* Buffer was busy because probably is pinned to journal transaction,
413bb557488SDmitry Monakhov * force transaction commit may help to free it. */
41488c6b61fSDmitry Monakhov if (*err == -EBUSY && retries++ < 4 && EXT4_SB(sb)->s_journal &&
41588c6b61fSDmitry Monakhov jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal))
416bb557488SDmitry Monakhov goto again;
417f868a48dSAkira Fujita return replaced_count;
418bb557488SDmitry Monakhov
419bb557488SDmitry Monakhov repair_branches:
420bb557488SDmitry Monakhov /*
421bb557488SDmitry Monakhov * This should never ever happen!
422bb557488SDmitry Monakhov * Extents are swapped already, but we are not able to copy data.
423bb557488SDmitry Monakhov * Try to swap extents to it's original places
424bb557488SDmitry Monakhov */
425393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode);
426fcf6b1b7SDmitry Monakhov replaced_count = ext4_swap_extents(handle, donor_inode, orig_inode,
427fcf6b1b7SDmitry Monakhov orig_blk_offset, donor_blk_offset,
428fcf6b1b7SDmitry Monakhov block_len_in_page, 0, &err2);
429393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode);
430bb557488SDmitry Monakhov if (replaced_count != block_len_in_page) {
43154d3adbcSTheodore Ts'o ext4_error_inode_block(orig_inode, (sector_t)(orig_blk_offset),
43254d3adbcSTheodore Ts'o EIO, "Unable to copy data block,"
433bb557488SDmitry Monakhov " data will be lost.");
434bb557488SDmitry Monakhov *err = -EIO;
435bb557488SDmitry Monakhov }
436bb557488SDmitry Monakhov replaced_count = 0;
4376dd8fe86SVishal Moola (Oracle) goto unlock_folios;
438748de673SAkira Fujita }
439748de673SAkira Fujita
440748de673SAkira Fujita /**
441c437b273SAkira Fujita * mext_check_arguments - Check whether move extent can be done
442748de673SAkira Fujita *
443748de673SAkira Fujita * @orig_inode: original inode
444748de673SAkira Fujita * @donor_inode: donor inode
445748de673SAkira Fujita * @orig_start: logical start offset in block for orig
446748de673SAkira Fujita * @donor_start: logical start offset in block for donor
447748de673SAkira Fujita * @len: the number of blocks to be moved
448748de673SAkira Fujita *
449748de673SAkira Fujita * Check the arguments of ext4_move_extents() whether the files can be
450748de673SAkira Fujita * exchanged with each other.
451748de673SAkira Fujita * Return 0 on success, or a negative error value on failure.
452748de673SAkira Fujita */
453748de673SAkira Fujita static int
mext_check_arguments(struct inode * orig_inode,struct inode * donor_inode,__u64 orig_start,__u64 donor_start,__u64 * len)454748de673SAkira Fujita mext_check_arguments(struct inode *orig_inode,
455748de673SAkira Fujita struct inode *donor_inode, __u64 orig_start,
456446aaa6eSKazuya Mio __u64 donor_start, __u64 *len)
457748de673SAkira Fujita {
458fcf6b1b7SDmitry Monakhov __u64 orig_eof, donor_eof;
45970d5d3dcSAkira Fujita unsigned int blkbits = orig_inode->i_blkbits;
46070d5d3dcSAkira Fujita unsigned int blocksize = 1 << blkbits;
46170d5d3dcSAkira Fujita
462fcf6b1b7SDmitry Monakhov orig_eof = (i_size_read(orig_inode) + blocksize - 1) >> blkbits;
463fcf6b1b7SDmitry Monakhov donor_eof = (i_size_read(donor_inode) + blocksize - 1) >> blkbits;
464fcf6b1b7SDmitry Monakhov
465fcf6b1b7SDmitry Monakhov
4664a58579bSAkira Fujita if (donor_inode->i_mode & (S_ISUID|S_ISGID)) {
4674a58579bSAkira Fujita ext4_debug("ext4 move extent: suid or sgid is set"
4684a58579bSAkira Fujita " to donor file [ino:orig %lu, donor %lu]\n",
4694a58579bSAkira Fujita orig_inode->i_ino, donor_inode->i_ino);
4704a58579bSAkira Fujita return -EINVAL;
4714a58579bSAkira Fujita }
4724a58579bSAkira Fujita
4731f5a81e4STheodore Ts'o if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode))
4741f5a81e4STheodore Ts'o return -EPERM;
4751f5a81e4STheodore Ts'o
476d412df53SEric Whitney /* Ext4 move extent does not support swap files */
477748de673SAkira Fujita if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) {
478d412df53SEric Whitney ext4_debug("ext4 move extent: The argument files should not be swap files [ino:orig %lu, donor %lu]\n",
479748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino);
480d412df53SEric Whitney return -ETXTBSY;
481748de673SAkira Fujita }
482748de673SAkira Fujita
48302749a4cSTahsin Erdogan if (ext4_is_quota_file(orig_inode) && ext4_is_quota_file(donor_inode)) {
484d412df53SEric Whitney ext4_debug("ext4 move extent: The argument files should not be quota files [ino:orig %lu, donor %lu]\n",
485daf647d2STheodore Ts'o orig_inode->i_ino, donor_inode->i_ino);
486d412df53SEric Whitney return -EOPNOTSUPP;
487daf647d2STheodore Ts'o }
488daf647d2STheodore Ts'o
489748de673SAkira Fujita /* Ext4 move extent supports only extent based file */
49012e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(orig_inode, EXT4_INODE_EXTENTS))) {
491748de673SAkira Fujita ext4_debug("ext4 move extent: orig file is not extents "
492748de673SAkira Fujita "based file [ino:orig %lu]\n", orig_inode->i_ino);
493748de673SAkira Fujita return -EOPNOTSUPP;
49412e9b892SDmitry Monakhov } else if (!(ext4_test_inode_flag(donor_inode, EXT4_INODE_EXTENTS))) {
495748de673SAkira Fujita ext4_debug("ext4 move extent: donor file is not extents "
496748de673SAkira Fujita "based file [ino:donor %lu]\n", donor_inode->i_ino);
497748de673SAkira Fujita return -EOPNOTSUPP;
498748de673SAkira Fujita }
499748de673SAkira Fujita
500748de673SAkira Fujita if ((!orig_inode->i_size) || (!donor_inode->i_size)) {
501748de673SAkira Fujita ext4_debug("ext4 move extent: File size is 0 byte\n");
502748de673SAkira Fujita return -EINVAL;
503748de673SAkira Fujita }
504748de673SAkira Fujita
505748de673SAkira Fujita /* Start offset should be same */
506fcf6b1b7SDmitry Monakhov if ((orig_start & ~(PAGE_MASK >> orig_inode->i_blkbits)) !=
507fcf6b1b7SDmitry Monakhov (donor_start & ~(PAGE_MASK >> orig_inode->i_blkbits))) {
508748de673SAkira Fujita ext4_debug("ext4 move extent: orig and donor's start "
509d67d64f4STheodore Ts'o "offsets are not aligned [ino:orig %lu, donor %lu]\n",
510748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino);
511748de673SAkira Fujita return -EINVAL;
512748de673SAkira Fujita }
513748de673SAkira Fujita
514f17722f9SLukas Czerner if ((orig_start >= EXT_MAX_BLOCKS) ||
515fcf6b1b7SDmitry Monakhov (donor_start >= EXT_MAX_BLOCKS) ||
516f17722f9SLukas Czerner (*len > EXT_MAX_BLOCKS) ||
517fcf6b1b7SDmitry Monakhov (donor_start + *len >= EXT_MAX_BLOCKS) ||
518f17722f9SLukas Czerner (orig_start + *len >= EXT_MAX_BLOCKS)) {
5190a80e986SEric Sandeen ext4_debug("ext4 move extent: Can't handle over [%u] blocks "
520f17722f9SLukas Czerner "[ino:orig %lu, donor %lu]\n", EXT_MAX_BLOCKS,
521748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino);
522748de673SAkira Fujita return -EINVAL;
523748de673SAkira Fujita }
524f18b2b83STheodore Ts'o if (orig_eof <= orig_start)
525f18b2b83STheodore Ts'o *len = 0;
526f18b2b83STheodore Ts'o else if (orig_eof < orig_start + *len - 1)
527fcf6b1b7SDmitry Monakhov *len = orig_eof - orig_start;
528f18b2b83STheodore Ts'o if (donor_eof <= donor_start)
529f18b2b83STheodore Ts'o *len = 0;
530f18b2b83STheodore Ts'o else if (donor_eof < donor_start + *len - 1)
531fcf6b1b7SDmitry Monakhov *len = donor_eof - donor_start;
532748de673SAkira Fujita if (!*len) {
53392c28159SAkira Fujita ext4_debug("ext4 move extent: len should not be 0 "
534748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", orig_inode->i_ino,
535748de673SAkira Fujita donor_inode->i_ino);
536748de673SAkira Fujita return -EINVAL;
537748de673SAkira Fujita }
538748de673SAkira Fujita
539748de673SAkira Fujita return 0;
540748de673SAkira Fujita }
541748de673SAkira Fujita
542748de673SAkira Fujita /**
543748de673SAkira Fujita * ext4_move_extents - Exchange the specified range of a file
544748de673SAkira Fujita *
545748de673SAkira Fujita * @o_filp: file structure of the original file
546748de673SAkira Fujita * @d_filp: file structure of the donor file
54765dd8327SXiaoguang Wang * @orig_blk: start offset in block for orig
54865dd8327SXiaoguang Wang * @donor_blk: start offset in block for donor
549748de673SAkira Fujita * @len: the number of blocks to be moved
550748de673SAkira Fujita * @moved_len: moved block length
551748de673SAkira Fujita *
552748de673SAkira Fujita * This function returns 0 and moved block length is set in moved_len
553748de673SAkira Fujita * if succeed, otherwise returns error value.
554748de673SAkira Fujita *
555748de673SAkira Fujita */
556748de673SAkira Fujita int
ext4_move_extents(struct file * o_filp,struct file * d_filp,__u64 orig_blk,__u64 donor_blk,__u64 len,__u64 * moved_len)557fcf6b1b7SDmitry Monakhov ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
558fcf6b1b7SDmitry Monakhov __u64 donor_blk, __u64 len, __u64 *moved_len)
559748de673SAkira Fujita {
560496ad9aaSAl Viro struct inode *orig_inode = file_inode(o_filp);
561496ad9aaSAl Viro struct inode *donor_inode = file_inode(d_filp);
562fcf6b1b7SDmitry Monakhov struct ext4_ext_path *path = NULL;
56309cbfeafSKirill A. Shutemov int blocks_per_page = PAGE_SIZE >> orig_inode->i_blkbits;
564fcf6b1b7SDmitry Monakhov ext4_lblk_t o_end, o_start = orig_blk;
565fcf6b1b7SDmitry Monakhov ext4_lblk_t d_start = donor_blk;
566fcf6b1b7SDmitry Monakhov int ret;
567748de673SAkira Fujita
56803bd8b9bSDmitry Monakhov if (orig_inode->i_sb != donor_inode->i_sb) {
56903bd8b9bSDmitry Monakhov ext4_debug("ext4 move extent: The argument files "
57003bd8b9bSDmitry Monakhov "should be in same FS [ino:orig %lu, donor %lu]\n",
57103bd8b9bSDmitry Monakhov orig_inode->i_ino, donor_inode->i_ino);
57203bd8b9bSDmitry Monakhov return -EINVAL;
57303bd8b9bSDmitry Monakhov }
57403bd8b9bSDmitry Monakhov
57503bd8b9bSDmitry Monakhov /* orig and donor should be different inodes */
57603bd8b9bSDmitry Monakhov if (orig_inode == donor_inode) {
577f3ce8064STheodore Ts'o ext4_debug("ext4 move extent: The argument files should not "
57803bd8b9bSDmitry Monakhov "be same inode [ino:orig %lu, donor %lu]\n",
579f3ce8064STheodore Ts'o orig_inode->i_ino, donor_inode->i_ino);
580f3ce8064STheodore Ts'o return -EINVAL;
581f3ce8064STheodore Ts'o }
582f3ce8064STheodore Ts'o
5837247c0caSAkira Fujita /* Regular file check */
5847247c0caSAkira Fujita if (!S_ISREG(orig_inode->i_mode) || !S_ISREG(donor_inode->i_mode)) {
5857247c0caSAkira Fujita ext4_debug("ext4 move extent: The argument files should be "
5867247c0caSAkira Fujita "regular file [ino:orig %lu, donor %lu]\n",
5877247c0caSAkira Fujita orig_inode->i_ino, donor_inode->i_ino);
5887247c0caSAkira Fujita return -EINVAL;
5897247c0caSAkira Fujita }
59004e22412SEric Whitney
59104e22412SEric Whitney /* TODO: it's not obvious how to swap blocks for inodes with full
59204e22412SEric Whitney journaling enabled */
593f066055aSDmitry Monakhov if (ext4_should_journal_data(orig_inode) ||
594f066055aSDmitry Monakhov ext4_should_journal_data(donor_inode)) {
59504e22412SEric Whitney ext4_msg(orig_inode->i_sb, KERN_ERR,
59604e22412SEric Whitney "Online defrag not supported with data journaling");
59704e22412SEric Whitney return -EOPNOTSUPP;
598f066055aSDmitry Monakhov }
59904e22412SEric Whitney
600592ddec7SChandan Rajendra if (IS_ENCRYPTED(orig_inode) || IS_ENCRYPTED(donor_inode)) {
60114fbd4aaSEric Whitney ext4_msg(orig_inode->i_sb, KERN_ERR,
60214fbd4aaSEric Whitney "Online defrag not supported for encrypted files");
60314fbd4aaSEric Whitney return -EOPNOTSUPP;
60414fbd4aaSEric Whitney }
60514fbd4aaSEric Whitney
606fc04cb49SAkira Fujita /* Protect orig and donor inodes against a truncate */
607375e289eSJ. Bruce Fields lock_two_nondirectories(orig_inode, donor_inode);
608748de673SAkira Fujita
60917335dccSDmitry Monakhov /* Wait for all existing dio workers */
61017335dccSDmitry Monakhov inode_dio_wait(orig_inode);
61117335dccSDmitry Monakhov inode_dio_wait(donor_inode);
61217335dccSDmitry Monakhov
613fc04cb49SAkira Fujita /* Protect extent tree against block allocations via delalloc */
614393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode);
615748de673SAkira Fujita /* Check the filesystem environment whether move_extent can be done */
616fcf6b1b7SDmitry Monakhov ret = mext_check_arguments(orig_inode, donor_inode, orig_blk,
617fcf6b1b7SDmitry Monakhov donor_blk, &len);
61803bd8b9bSDmitry Monakhov if (ret)
619347fa6f1SAkira Fujita goto out;
620fcf6b1b7SDmitry Monakhov o_end = o_start + len;
621748de673SAkira Fujita
622*2883940bSBaokun Li *moved_len = 0;
623fcf6b1b7SDmitry Monakhov while (o_start < o_end) {
624fcf6b1b7SDmitry Monakhov struct ext4_extent *ex;
625fcf6b1b7SDmitry Monakhov ext4_lblk_t cur_blk, next_blk;
626fcf6b1b7SDmitry Monakhov pgoff_t orig_page_index, donor_page_index;
627fcf6b1b7SDmitry Monakhov int offset_in_page;
628fcf6b1b7SDmitry Monakhov int unwritten, cur_len;
629748de673SAkira Fujita
630fcf6b1b7SDmitry Monakhov ret = get_ext_path(orig_inode, o_start, &path);
63103bd8b9bSDmitry Monakhov if (ret)
632347fa6f1SAkira Fujita goto out;
633fcf6b1b7SDmitry Monakhov ex = path[path->p_depth].p_ext;
634fcf6b1b7SDmitry Monakhov cur_blk = le32_to_cpu(ex->ee_block);
635fcf6b1b7SDmitry Monakhov cur_len = ext4_ext_get_actual_len(ex);
636fcf6b1b7SDmitry Monakhov /* Check hole before the start pos */
637fcf6b1b7SDmitry Monakhov if (cur_blk + cur_len - 1 < o_start) {
638d412df53SEric Whitney next_blk = ext4_ext_next_allocated_block(path);
639fcf6b1b7SDmitry Monakhov if (next_blk == EXT_MAX_BLOCKS) {
640fcf6b1b7SDmitry Monakhov ret = -ENODATA;
641748de673SAkira Fujita goto out;
642748de673SAkira Fujita }
643fcf6b1b7SDmitry Monakhov d_start += next_blk - o_start;
644fcf6b1b7SDmitry Monakhov o_start = next_blk;
6453bdf14b4STheodore Ts'o continue;
646fcf6b1b7SDmitry Monakhov /* Check hole after the start pos */
647fcf6b1b7SDmitry Monakhov } else if (cur_blk > o_start) {
648fcf6b1b7SDmitry Monakhov /* Skip hole */
649fcf6b1b7SDmitry Monakhov d_start += cur_blk - o_start;
650fcf6b1b7SDmitry Monakhov o_start = cur_blk;
651fcf6b1b7SDmitry Monakhov /* Extent inside requested range ?*/
652fcf6b1b7SDmitry Monakhov if (cur_blk >= o_end)
653748de673SAkira Fujita goto out;
654fcf6b1b7SDmitry Monakhov } else { /* in_range(o_start, o_blk, o_len) */
655fcf6b1b7SDmitry Monakhov cur_len += cur_blk - o_start;
656748de673SAkira Fujita }
657fcf6b1b7SDmitry Monakhov unwritten = ext4_ext_is_unwritten(ex);
658fcf6b1b7SDmitry Monakhov if (o_end - o_start < cur_len)
659fcf6b1b7SDmitry Monakhov cur_len = o_end - o_start;
660748de673SAkira Fujita
66109cbfeafSKirill A. Shutemov orig_page_index = o_start >> (PAGE_SHIFT -
662fcf6b1b7SDmitry Monakhov orig_inode->i_blkbits);
66309cbfeafSKirill A. Shutemov donor_page_index = d_start >> (PAGE_SHIFT -
664fcf6b1b7SDmitry Monakhov donor_inode->i_blkbits);
665fcf6b1b7SDmitry Monakhov offset_in_page = o_start % blocks_per_page;
666fcf6b1b7SDmitry Monakhov if (cur_len > blocks_per_page - offset_in_page)
667fcf6b1b7SDmitry Monakhov cur_len = blocks_per_page - offset_in_page;
668fc04cb49SAkira Fujita /*
669fc04cb49SAkira Fujita * Up semaphore to avoid following problems:
670fc04cb49SAkira Fujita * a. transaction deadlock among ext4_journal_start,
671fc04cb49SAkira Fujita * ->write_begin via pagefault, and jbd2_journal_commit
672fe5ddf6bSMatthew Wilcox (Oracle) * b. racing with ->read_folio, ->write_begin, and
673fe5ddf6bSMatthew Wilcox (Oracle) * ext4_get_block in move_extent_per_page
674fc04cb49SAkira Fujita */
675393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode);
676748de673SAkira Fujita /* Swap original branches with new branches */
677*2883940bSBaokun Li *moved_len += move_extent_per_page(o_filp, donor_inode,
678fcf6b1b7SDmitry Monakhov orig_page_index, donor_page_index,
679fcf6b1b7SDmitry Monakhov offset_in_page, cur_len,
680556615dcSLukas Czerner unwritten, &ret);
681393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode);
68203bd8b9bSDmitry Monakhov if (ret < 0)
683fc04cb49SAkira Fujita break;
684fcf6b1b7SDmitry Monakhov o_start += cur_len;
685fcf6b1b7SDmitry Monakhov d_start += cur_len;
686748de673SAkira Fujita }
687fcf6b1b7SDmitry Monakhov
688748de673SAkira Fujita out:
68994d7c16cSAkira Fujita if (*moved_len) {
69027bc446eSbrookxu ext4_discard_preallocations(orig_inode, 0);
69127bc446eSbrookxu ext4_discard_preallocations(donor_inode, 0);
69294d7c16cSAkira Fujita }
69394d7c16cSAkira Fujita
6947ff5fddaSYe Bin ext4_free_ext_path(path);
695393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode);
696375e289eSJ. Bruce Fields unlock_two_nondirectories(orig_inode, donor_inode);
697748de673SAkira Fujita
69803bd8b9bSDmitry Monakhov return ret;
699748de673SAkira Fujita }
700