17336d0e6SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2b1e71b06SSteven Whitehouse /* 3b1e71b06SSteven Whitehouse * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4b1e71b06SSteven Whitehouse * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. 5b1e71b06SSteven Whitehouse */ 6b1e71b06SSteven Whitehouse 7b1e71b06SSteven Whitehouse #include <linux/sched.h> 8b1e71b06SSteven Whitehouse #include <linux/slab.h> 9b1e71b06SSteven Whitehouse #include <linux/spinlock.h> 10b1e71b06SSteven Whitehouse #include <linux/completion.h> 11b1e71b06SSteven Whitehouse #include <linux/buffer_head.h> 12b1e71b06SSteven Whitehouse #include <linux/pagemap.h> 13b1e71b06SSteven Whitehouse #include <linux/pagevec.h> 14b1e71b06SSteven Whitehouse #include <linux/mpage.h> 15b1e71b06SSteven Whitehouse #include <linux/fs.h> 16b1e71b06SSteven Whitehouse #include <linux/writeback.h> 17b1e71b06SSteven Whitehouse #include <linux/swap.h> 18b1e71b06SSteven Whitehouse #include <linux/gfs2_ondisk.h> 19b1e71b06SSteven Whitehouse #include <linux/backing-dev.h> 20e2e40f2cSChristoph Hellwig #include <linux/uio.h> 21774016b2SSteven Whitehouse #include <trace/events/writeback.h> 2264bc06bbSAndreas Gruenbacher #include <linux/sched/signal.h> 23b1e71b06SSteven Whitehouse 24b1e71b06SSteven Whitehouse #include "gfs2.h" 25b1e71b06SSteven Whitehouse #include "incore.h" 26b1e71b06SSteven Whitehouse #include "bmap.h" 27b1e71b06SSteven Whitehouse #include "glock.h" 28b1e71b06SSteven Whitehouse #include "inode.h" 29b1e71b06SSteven Whitehouse #include "log.h" 30b1e71b06SSteven Whitehouse #include "meta_io.h" 31b1e71b06SSteven Whitehouse #include "quota.h" 32b1e71b06SSteven Whitehouse #include "trans.h" 33b1e71b06SSteven Whitehouse #include "rgrp.h" 34b1e71b06SSteven Whitehouse #include "super.h" 35b1e71b06SSteven Whitehouse #include "util.h" 36b1e71b06SSteven Whitehouse #include "glops.h" 3764bc06bbSAndreas Gruenbacher #include "aops.h" 38b1e71b06SSteven Whitehouse 39b1e71b06SSteven Whitehouse 4064bc06bbSAndreas Gruenbacher void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, 4188b65ce5SAndreas Gruenbacher unsigned int from, unsigned int len) 42b1e71b06SSteven Whitehouse { 43b1e71b06SSteven Whitehouse struct buffer_head *head = page_buffers(page); 44b1e71b06SSteven Whitehouse unsigned int bsize = head->b_size; 45b1e71b06SSteven Whitehouse struct buffer_head *bh; 4688b65ce5SAndreas Gruenbacher unsigned int to = from + len; 47b1e71b06SSteven Whitehouse unsigned int start, end; 48b1e71b06SSteven Whitehouse 49b1e71b06SSteven Whitehouse for (bh = head, start = 0; bh != head || !start; 50b1e71b06SSteven Whitehouse bh = bh->b_this_page, start = end) { 51b1e71b06SSteven Whitehouse end = start + bsize; 5288b65ce5SAndreas Gruenbacher if (end <= from) 53b1e71b06SSteven Whitehouse continue; 5488b65ce5SAndreas Gruenbacher if (start >= to) 5588b65ce5SAndreas Gruenbacher break; 56b1e71b06SSteven Whitehouse set_buffer_uptodate(bh); 57350a9b0aSSteven Whitehouse gfs2_trans_add_data(ip->i_gl, bh); 58b1e71b06SSteven Whitehouse } 59b1e71b06SSteven Whitehouse } 60b1e71b06SSteven Whitehouse 61b1e71b06SSteven Whitehouse /** 62b1e71b06SSteven Whitehouse * gfs2_get_block_noalloc - Fills in a buffer head with details about a block 63b1e71b06SSteven Whitehouse * @inode: The inode 64b1e71b06SSteven Whitehouse * @lblock: The block number to look up 65b1e71b06SSteven Whitehouse * @bh_result: The buffer head to return the result in 66b1e71b06SSteven Whitehouse * @create: Non-zero if we may add block to the file 67b1e71b06SSteven Whitehouse * 68b1e71b06SSteven Whitehouse * Returns: errno 69b1e71b06SSteven Whitehouse */ 70b1e71b06SSteven Whitehouse 71b1e71b06SSteven Whitehouse static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, 72b1e71b06SSteven Whitehouse struct buffer_head *bh_result, int create) 73b1e71b06SSteven Whitehouse { 74b1e71b06SSteven Whitehouse int error; 75b1e71b06SSteven Whitehouse 76b1e71b06SSteven Whitehouse error = gfs2_block_map(inode, lblock, bh_result, 0); 77b1e71b06SSteven Whitehouse if (error) 78b1e71b06SSteven Whitehouse return error; 79b1e71b06SSteven Whitehouse if (!buffer_mapped(bh_result)) 80b1e71b06SSteven Whitehouse return -EIO; 81b1e71b06SSteven Whitehouse return 0; 82b1e71b06SSteven Whitehouse } 83b1e71b06SSteven Whitehouse 84b1e71b06SSteven Whitehouse /** 8559c01c50SChristoph Hellwig * gfs2_writepage - Write page for writeback mappings 8659c01c50SChristoph Hellwig * @page: The page 87b1e71b06SSteven Whitehouse * @wbc: The writeback control 88b1e71b06SSteven Whitehouse */ 8959c01c50SChristoph Hellwig static int gfs2_writepage(struct page *page, struct writeback_control *wbc) 90b1e71b06SSteven Whitehouse { 91b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 92b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 93b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 942164f9b9SChristoph Hellwig struct iomap_writepage_ctx wpc = { }; 95b1e71b06SSteven Whitehouse 96b1e71b06SSteven Whitehouse if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 97b1e71b06SSteven Whitehouse goto out; 98b1e71b06SSteven Whitehouse if (current->journal_info) 99b1e71b06SSteven Whitehouse goto redirty; 1002164f9b9SChristoph Hellwig return iomap_writepage(page, wbc, &wpc, &gfs2_writeback_ops); 10159c01c50SChristoph Hellwig 102b1e71b06SSteven Whitehouse redirty: 103b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 104b1e71b06SSteven Whitehouse out: 105b1e71b06SSteven Whitehouse unlock_page(page); 106b1e71b06SSteven Whitehouse return 0; 107b1e71b06SSteven Whitehouse } 108b1e71b06SSteven Whitehouse 109fd4c5748SBenjamin Marzinski /* This is the same as calling block_write_full_page, but it also 110fd4c5748SBenjamin Marzinski * writes pages outside of i_size 111fd4c5748SBenjamin Marzinski */ 112c548a1c1SAndrew Price static int gfs2_write_full_page(struct page *page, get_block_t *get_block, 113fd4c5748SBenjamin Marzinski struct writeback_control *wbc) 114fd4c5748SBenjamin Marzinski { 115fd4c5748SBenjamin Marzinski struct inode * const inode = page->mapping->host; 116fd4c5748SBenjamin Marzinski loff_t i_size = i_size_read(inode); 117fd4c5748SBenjamin Marzinski const pgoff_t end_index = i_size >> PAGE_SHIFT; 118fd4c5748SBenjamin Marzinski unsigned offset; 119fd4c5748SBenjamin Marzinski 120fd4c5748SBenjamin Marzinski /* 121fd4c5748SBenjamin Marzinski * The page straddles i_size. It must be zeroed out on each and every 122fd4c5748SBenjamin Marzinski * writepage invocation because it may be mmapped. "A file is mapped 123fd4c5748SBenjamin Marzinski * in multiples of the page size. For a file that is not a multiple of 124fd4c5748SBenjamin Marzinski * the page size, the remaining memory is zeroed when mapped, and 125fd4c5748SBenjamin Marzinski * writes to that region are not written out to the file." 126fd4c5748SBenjamin Marzinski */ 127fd4c5748SBenjamin Marzinski offset = i_size & (PAGE_SIZE - 1); 128fd4c5748SBenjamin Marzinski if (page->index == end_index && offset) 129fd4c5748SBenjamin Marzinski zero_user_segment(page, offset, PAGE_SIZE); 130fd4c5748SBenjamin Marzinski 131fd4c5748SBenjamin Marzinski return __block_write_full_page(inode, page, get_block, wbc, 132fd4c5748SBenjamin Marzinski end_buffer_async_write); 133fd4c5748SBenjamin Marzinski } 134fd4c5748SBenjamin Marzinski 135b1e71b06SSteven Whitehouse /** 136b1e71b06SSteven Whitehouse * __gfs2_jdata_writepage - The core of jdata writepage 137b1e71b06SSteven Whitehouse * @page: The page to write 138b1e71b06SSteven Whitehouse * @wbc: The writeback control 139b1e71b06SSteven Whitehouse * 140b1e71b06SSteven Whitehouse * This is shared between writepage and writepages and implements the 141b1e71b06SSteven Whitehouse * core of the writepage operation. If a transaction is required then 142b1e71b06SSteven Whitehouse * PageChecked will have been set and the transaction will have 143b1e71b06SSteven Whitehouse * already been started before this is called. 144b1e71b06SSteven Whitehouse */ 145b1e71b06SSteven Whitehouse 146b1e71b06SSteven Whitehouse static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 147b1e71b06SSteven Whitehouse { 148b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 149b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 150b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 151b1e71b06SSteven Whitehouse 152b1e71b06SSteven Whitehouse if (PageChecked(page)) { 153b1e71b06SSteven Whitehouse ClearPageChecked(page); 154b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) { 155b1e71b06SSteven Whitehouse create_empty_buffers(page, inode->i_sb->s_blocksize, 15647a9a527SFabian Frederick BIT(BH_Dirty)|BIT(BH_Uptodate)); 157b1e71b06SSteven Whitehouse } 15888b65ce5SAndreas Gruenbacher gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize); 159b1e71b06SSteven Whitehouse } 160fd4c5748SBenjamin Marzinski return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc); 161b1e71b06SSteven Whitehouse } 162b1e71b06SSteven Whitehouse 163b1e71b06SSteven Whitehouse /** 164b1e71b06SSteven Whitehouse * gfs2_jdata_writepage - Write complete page 165b1e71b06SSteven Whitehouse * @page: Page to write 1661272574bSFabian Frederick * @wbc: The writeback control 167b1e71b06SSteven Whitehouse * 168b1e71b06SSteven Whitehouse * Returns: errno 169b1e71b06SSteven Whitehouse * 170b1e71b06SSteven Whitehouse */ 171b1e71b06SSteven Whitehouse 172b1e71b06SSteven Whitehouse static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 173b1e71b06SSteven Whitehouse { 174b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 175fd4c5748SBenjamin Marzinski struct gfs2_inode *ip = GFS2_I(inode); 176b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 177b1e71b06SSteven Whitehouse 178fd4c5748SBenjamin Marzinski if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 179fd4c5748SBenjamin Marzinski goto out; 180fd4c5748SBenjamin Marzinski if (PageChecked(page) || current->journal_info) 181b1e71b06SSteven Whitehouse goto out_ignore; 182e556280dSBob Peterson return __gfs2_jdata_writepage(page, wbc); 183b1e71b06SSteven Whitehouse 184b1e71b06SSteven Whitehouse out_ignore: 185b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 186fd4c5748SBenjamin Marzinski out: 187b1e71b06SSteven Whitehouse unlock_page(page); 188b1e71b06SSteven Whitehouse return 0; 189b1e71b06SSteven Whitehouse } 190b1e71b06SSteven Whitehouse 191b1e71b06SSteven Whitehouse /** 19245138990SSteven Whitehouse * gfs2_writepages - Write a bunch of dirty pages back to disk 193b1e71b06SSteven Whitehouse * @mapping: The mapping to write 194b1e71b06SSteven Whitehouse * @wbc: Write-back control 195b1e71b06SSteven Whitehouse * 19645138990SSteven Whitehouse * Used for both ordered and writeback modes. 197b1e71b06SSteven Whitehouse */ 19845138990SSteven Whitehouse static int gfs2_writepages(struct address_space *mapping, 199b1e71b06SSteven Whitehouse struct writeback_control *wbc) 200b1e71b06SSteven Whitehouse { 201b066a4eeSAbhi Das struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 2022164f9b9SChristoph Hellwig struct iomap_writepage_ctx wpc = { }; 2032164f9b9SChristoph Hellwig int ret; 204b066a4eeSAbhi Das 205b066a4eeSAbhi Das /* 206b066a4eeSAbhi Das * Even if we didn't write any pages here, we might still be holding 207b066a4eeSAbhi Das * dirty pages in the ail. We forcibly flush the ail because we don't 208b066a4eeSAbhi Das * want balance_dirty_pages() to loop indefinitely trying to write out 209b066a4eeSAbhi Das * pages held in the ail that it can't find. 210b066a4eeSAbhi Das */ 2112164f9b9SChristoph Hellwig ret = iomap_writepages(mapping, wbc, &wpc, &gfs2_writeback_ops); 212b066a4eeSAbhi Das if (ret == 0) 213b066a4eeSAbhi Das set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags); 214b066a4eeSAbhi Das return ret; 215b1e71b06SSteven Whitehouse } 216b1e71b06SSteven Whitehouse 217b1e71b06SSteven Whitehouse /** 218b1e71b06SSteven Whitehouse * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages 219b1e71b06SSteven Whitehouse * @mapping: The mapping 220b1e71b06SSteven Whitehouse * @wbc: The writeback control 221b1e71b06SSteven Whitehouse * @pvec: The vector of pages 222b1e71b06SSteven Whitehouse * @nr_pages: The number of pages to write 2231272574bSFabian Frederick * @done_index: Page index 224b1e71b06SSteven Whitehouse * 225b1e71b06SSteven Whitehouse * Returns: non-zero if loop should terminate, zero otherwise 226b1e71b06SSteven Whitehouse */ 227b1e71b06SSteven Whitehouse 228b1e71b06SSteven Whitehouse static int gfs2_write_jdata_pagevec(struct address_space *mapping, 229b1e71b06SSteven Whitehouse struct writeback_control *wbc, 230b1e71b06SSteven Whitehouse struct pagevec *pvec, 2319aa01593SAndreas Gruenbacher int nr_pages, 232774016b2SSteven Whitehouse pgoff_t *done_index) 233b1e71b06SSteven Whitehouse { 234b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 235b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 23645eb0504SAndreas Gruenbacher unsigned nrblocks = nr_pages * (PAGE_SIZE >> inode->i_blkbits); 237b1e71b06SSteven Whitehouse int i; 238b1e71b06SSteven Whitehouse int ret; 239b1e71b06SSteven Whitehouse 240b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); 241b1e71b06SSteven Whitehouse if (ret < 0) 242b1e71b06SSteven Whitehouse return ret; 243b1e71b06SSteven Whitehouse 244b1e71b06SSteven Whitehouse for(i = 0; i < nr_pages; i++) { 245b1e71b06SSteven Whitehouse struct page *page = pvec->pages[i]; 246b1e71b06SSteven Whitehouse 247774016b2SSteven Whitehouse *done_index = page->index; 248774016b2SSteven Whitehouse 249b1e71b06SSteven Whitehouse lock_page(page); 250b1e71b06SSteven Whitehouse 251b1e71b06SSteven Whitehouse if (unlikely(page->mapping != mapping)) { 252774016b2SSteven Whitehouse continue_unlock: 253b1e71b06SSteven Whitehouse unlock_page(page); 254b1e71b06SSteven Whitehouse continue; 255b1e71b06SSteven Whitehouse } 256b1e71b06SSteven Whitehouse 257774016b2SSteven Whitehouse if (!PageDirty(page)) { 258774016b2SSteven Whitehouse /* someone wrote it for us */ 259774016b2SSteven Whitehouse goto continue_unlock; 260b1e71b06SSteven Whitehouse } 261b1e71b06SSteven Whitehouse 262774016b2SSteven Whitehouse if (PageWriteback(page)) { 263b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_NONE) 264b1e71b06SSteven Whitehouse wait_on_page_writeback(page); 265774016b2SSteven Whitehouse else 266774016b2SSteven Whitehouse goto continue_unlock; 267b1e71b06SSteven Whitehouse } 268b1e71b06SSteven Whitehouse 269774016b2SSteven Whitehouse BUG_ON(PageWriteback(page)); 270774016b2SSteven Whitehouse if (!clear_page_dirty_for_io(page)) 271774016b2SSteven Whitehouse goto continue_unlock; 272774016b2SSteven Whitehouse 273de1414a6SChristoph Hellwig trace_wbc_writepage(wbc, inode_to_bdi(inode)); 274b1e71b06SSteven Whitehouse 275b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 276774016b2SSteven Whitehouse if (unlikely(ret)) { 277774016b2SSteven Whitehouse if (ret == AOP_WRITEPAGE_ACTIVATE) { 278774016b2SSteven Whitehouse unlock_page(page); 279774016b2SSteven Whitehouse ret = 0; 280774016b2SSteven Whitehouse } else { 281b1e71b06SSteven Whitehouse 282774016b2SSteven Whitehouse /* 283774016b2SSteven Whitehouse * done_index is set past this page, 284774016b2SSteven Whitehouse * so media errors will not choke 285774016b2SSteven Whitehouse * background writeout for the entire 286774016b2SSteven Whitehouse * file. This has consequences for 287774016b2SSteven Whitehouse * range_cyclic semantics (ie. it may 288774016b2SSteven Whitehouse * not be suitable for data integrity 289774016b2SSteven Whitehouse * writeout). 290774016b2SSteven Whitehouse */ 291774016b2SSteven Whitehouse *done_index = page->index + 1; 292b1e71b06SSteven Whitehouse ret = 1; 293774016b2SSteven Whitehouse break; 294774016b2SSteven Whitehouse } 295774016b2SSteven Whitehouse } 296774016b2SSteven Whitehouse 297774016b2SSteven Whitehouse /* 298774016b2SSteven Whitehouse * We stop writing back only if we are not doing 299774016b2SSteven Whitehouse * integrity sync. In case of integrity sync we have to 300774016b2SSteven Whitehouse * keep going until we have written all the pages 301774016b2SSteven Whitehouse * we tagged for writeback prior to entering this loop. 302774016b2SSteven Whitehouse */ 303774016b2SSteven Whitehouse if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) { 304774016b2SSteven Whitehouse ret = 1; 305774016b2SSteven Whitehouse break; 306774016b2SSteven Whitehouse } 307774016b2SSteven Whitehouse 308b1e71b06SSteven Whitehouse } 309b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 310b1e71b06SSteven Whitehouse return ret; 311b1e71b06SSteven Whitehouse } 312b1e71b06SSteven Whitehouse 313b1e71b06SSteven Whitehouse /** 314b1e71b06SSteven Whitehouse * gfs2_write_cache_jdata - Like write_cache_pages but different 315b1e71b06SSteven Whitehouse * @mapping: The mapping to write 316b1e71b06SSteven Whitehouse * @wbc: The writeback control 317b1e71b06SSteven Whitehouse * 318b1e71b06SSteven Whitehouse * The reason that we use our own function here is that we need to 319b1e71b06SSteven Whitehouse * start transactions before we grab page locks. This allows us 320b1e71b06SSteven Whitehouse * to get the ordering right. 321b1e71b06SSteven Whitehouse */ 322b1e71b06SSteven Whitehouse 323b1e71b06SSteven Whitehouse static int gfs2_write_cache_jdata(struct address_space *mapping, 324b1e71b06SSteven Whitehouse struct writeback_control *wbc) 325b1e71b06SSteven Whitehouse { 326b1e71b06SSteven Whitehouse int ret = 0; 327b1e71b06SSteven Whitehouse int done = 0; 328b1e71b06SSteven Whitehouse struct pagevec pvec; 329b1e71b06SSteven Whitehouse int nr_pages; 3303f649ab7SKees Cook pgoff_t writeback_index; 331b1e71b06SSteven Whitehouse pgoff_t index; 332b1e71b06SSteven Whitehouse pgoff_t end; 333774016b2SSteven Whitehouse pgoff_t done_index; 334774016b2SSteven Whitehouse int cycled; 335b1e71b06SSteven Whitehouse int range_whole = 0; 33610bbd235SMatthew Wilcox xa_mark_t tag; 337b1e71b06SSteven Whitehouse 33886679820SMel Gorman pagevec_init(&pvec); 339b1e71b06SSteven Whitehouse if (wbc->range_cyclic) { 340774016b2SSteven Whitehouse writeback_index = mapping->writeback_index; /* prev offset */ 341774016b2SSteven Whitehouse index = writeback_index; 342774016b2SSteven Whitehouse if (index == 0) 343774016b2SSteven Whitehouse cycled = 1; 344774016b2SSteven Whitehouse else 345774016b2SSteven Whitehouse cycled = 0; 346b1e71b06SSteven Whitehouse end = -1; 347b1e71b06SSteven Whitehouse } else { 34809cbfeafSKirill A. Shutemov index = wbc->range_start >> PAGE_SHIFT; 34909cbfeafSKirill A. Shutemov end = wbc->range_end >> PAGE_SHIFT; 350b1e71b06SSteven Whitehouse if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 351b1e71b06SSteven Whitehouse range_whole = 1; 352774016b2SSteven Whitehouse cycled = 1; /* ignore range_cyclic tests */ 353b1e71b06SSteven Whitehouse } 354774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 355774016b2SSteven Whitehouse tag = PAGECACHE_TAG_TOWRITE; 356774016b2SSteven Whitehouse else 357774016b2SSteven Whitehouse tag = PAGECACHE_TAG_DIRTY; 358b1e71b06SSteven Whitehouse 359b1e71b06SSteven Whitehouse retry: 360774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 361774016b2SSteven Whitehouse tag_pages_for_writeback(mapping, index, end); 362774016b2SSteven Whitehouse done_index = index; 363774016b2SSteven Whitehouse while (!done && (index <= end)) { 364d2bc5b3cSJan Kara nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end, 36567fd707fSJan Kara tag); 366774016b2SSteven Whitehouse if (nr_pages == 0) 367774016b2SSteven Whitehouse break; 368774016b2SSteven Whitehouse 3699aa01593SAndreas Gruenbacher ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, &done_index); 370b1e71b06SSteven Whitehouse if (ret) 371b1e71b06SSteven Whitehouse done = 1; 372b1e71b06SSteven Whitehouse if (ret > 0) 373b1e71b06SSteven Whitehouse ret = 0; 374b1e71b06SSteven Whitehouse pagevec_release(&pvec); 375b1e71b06SSteven Whitehouse cond_resched(); 376b1e71b06SSteven Whitehouse } 377b1e71b06SSteven Whitehouse 378774016b2SSteven Whitehouse if (!cycled && !done) { 379b1e71b06SSteven Whitehouse /* 380774016b2SSteven Whitehouse * range_cyclic: 381b1e71b06SSteven Whitehouse * We hit the last page and there is more work to be done: wrap 382b1e71b06SSteven Whitehouse * back to the start of the file 383b1e71b06SSteven Whitehouse */ 384774016b2SSteven Whitehouse cycled = 1; 385b1e71b06SSteven Whitehouse index = 0; 386774016b2SSteven Whitehouse end = writeback_index - 1; 387b1e71b06SSteven Whitehouse goto retry; 388b1e71b06SSteven Whitehouse } 389b1e71b06SSteven Whitehouse 390b1e71b06SSteven Whitehouse if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 391774016b2SSteven Whitehouse mapping->writeback_index = done_index; 392774016b2SSteven Whitehouse 393b1e71b06SSteven Whitehouse return ret; 394b1e71b06SSteven Whitehouse } 395b1e71b06SSteven Whitehouse 396b1e71b06SSteven Whitehouse 397b1e71b06SSteven Whitehouse /** 398b1e71b06SSteven Whitehouse * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk 399b1e71b06SSteven Whitehouse * @mapping: The mapping to write 400b1e71b06SSteven Whitehouse * @wbc: The writeback control 401b1e71b06SSteven Whitehouse * 402b1e71b06SSteven Whitehouse */ 403b1e71b06SSteven Whitehouse 404b1e71b06SSteven Whitehouse static int gfs2_jdata_writepages(struct address_space *mapping, 405b1e71b06SSteven Whitehouse struct writeback_control *wbc) 406b1e71b06SSteven Whitehouse { 407b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 408b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 409b1e71b06SSteven Whitehouse int ret; 410b1e71b06SSteven Whitehouse 411b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 412b1e71b06SSteven Whitehouse if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { 413805c0907SBob Peterson gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | 414805c0907SBob Peterson GFS2_LFC_JDATA_WPAGES); 415b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 416b1e71b06SSteven Whitehouse } 417b1e71b06SSteven Whitehouse return ret; 418b1e71b06SSteven Whitehouse } 419b1e71b06SSteven Whitehouse 420b1e71b06SSteven Whitehouse /** 421b1e71b06SSteven Whitehouse * stuffed_readpage - Fill in a Linux page with stuffed file data 422b1e71b06SSteven Whitehouse * @ip: the inode 423b1e71b06SSteven Whitehouse * @page: the page 424b1e71b06SSteven Whitehouse * 425b1e71b06SSteven Whitehouse * Returns: errno 426b1e71b06SSteven Whitehouse */ 427378b6cbfSChristoph Hellwig static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) 428b1e71b06SSteven Whitehouse { 429b1e71b06SSteven Whitehouse struct buffer_head *dibh; 430602c89d2SSteven Whitehouse u64 dsize = i_size_read(&ip->i_inode); 431b1e71b06SSteven Whitehouse void *kaddr; 432b1e71b06SSteven Whitehouse int error; 433b1e71b06SSteven Whitehouse 434b1e71b06SSteven Whitehouse /* 435b1e71b06SSteven Whitehouse * Due to the order of unstuffing files and ->fault(), we can be 436b1e71b06SSteven Whitehouse * asked for a zero page in the case of a stuffed file being extended, 437b1e71b06SSteven Whitehouse * so we need to supply one here. It doesn't happen often. 438b1e71b06SSteven Whitehouse */ 439b1e71b06SSteven Whitehouse if (unlikely(page->index)) { 44009cbfeafSKirill A. Shutemov zero_user(page, 0, PAGE_SIZE); 441b1e71b06SSteven Whitehouse SetPageUptodate(page); 442b1e71b06SSteven Whitehouse return 0; 443b1e71b06SSteven Whitehouse } 444b1e71b06SSteven Whitehouse 445b1e71b06SSteven Whitehouse error = gfs2_meta_inode_buffer(ip, &dibh); 446b1e71b06SSteven Whitehouse if (error) 447b1e71b06SSteven Whitehouse return error; 448b1e71b06SSteven Whitehouse 449d9349285SCong Wang kaddr = kmap_atomic(page); 450235628c5SAndreas Gruenbacher if (dsize > gfs2_max_stuffed_size(ip)) 451235628c5SAndreas Gruenbacher dsize = gfs2_max_stuffed_size(ip); 452602c89d2SSteven Whitehouse memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); 45309cbfeafSKirill A. Shutemov memset(kaddr + dsize, 0, PAGE_SIZE - dsize); 454d9349285SCong Wang kunmap_atomic(kaddr); 455b1e71b06SSteven Whitehouse flush_dcache_page(page); 456b1e71b06SSteven Whitehouse brelse(dibh); 457b1e71b06SSteven Whitehouse SetPageUptodate(page); 458b1e71b06SSteven Whitehouse 459b1e71b06SSteven Whitehouse return 0; 460b1e71b06SSteven Whitehouse } 461b1e71b06SSteven Whitehouse 462b1e71b06SSteven Whitehouse 463b1e71b06SSteven Whitehouse static int __gfs2_readpage(void *file, struct page *page) 464b1e71b06SSteven Whitehouse { 4652164f9b9SChristoph Hellwig struct inode *inode = page->mapping->host; 4662164f9b9SChristoph Hellwig struct gfs2_inode *ip = GFS2_I(inode); 4672164f9b9SChristoph Hellwig struct gfs2_sbd *sdp = GFS2_SB(inode); 468b1e71b06SSteven Whitehouse int error; 469b1e71b06SSteven Whitehouse 4702164f9b9SChristoph Hellwig if (!gfs2_is_jdata(ip) || 4712164f9b9SChristoph Hellwig (i_blocksize(inode) == PAGE_SIZE && !page_has_buffers(page))) { 472f95cbb44SAndreas Gruenbacher error = iomap_readpage(page, &gfs2_iomap_ops); 473f95cbb44SAndreas Gruenbacher } else if (gfs2_is_stuffed(ip)) { 474b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 475b1e71b06SSteven Whitehouse unlock_page(page); 476b1e71b06SSteven Whitehouse } else { 477b1e71b06SSteven Whitehouse error = mpage_readpage(page, gfs2_block_map); 478b1e71b06SSteven Whitehouse } 479b1e71b06SSteven Whitehouse 480eb43e660SBob Peterson if (unlikely(gfs2_withdrawn(sdp))) 481b1e71b06SSteven Whitehouse return -EIO; 482b1e71b06SSteven Whitehouse 483b1e71b06SSteven Whitehouse return error; 484b1e71b06SSteven Whitehouse } 485b1e71b06SSteven Whitehouse 486b1e71b06SSteven Whitehouse /** 487b1e71b06SSteven Whitehouse * gfs2_readpage - read a page of a file 488b1e71b06SSteven Whitehouse * @file: The file to read 489b1e71b06SSteven Whitehouse * @page: The page of the file 490b1e71b06SSteven Whitehouse */ 491b1e71b06SSteven Whitehouse 492b1e71b06SSteven Whitehouse static int gfs2_readpage(struct file *file, struct page *page) 493b1e71b06SSteven Whitehouse { 49420f82999SAndreas Gruenbacher return __gfs2_readpage(file, page); 495b1e71b06SSteven Whitehouse } 496b1e71b06SSteven Whitehouse 497b1e71b06SSteven Whitehouse /** 498b1e71b06SSteven Whitehouse * gfs2_internal_read - read an internal file 499b1e71b06SSteven Whitehouse * @ip: The gfs2 inode 500b1e71b06SSteven Whitehouse * @buf: The buffer to fill 501b1e71b06SSteven Whitehouse * @pos: The file position 502b1e71b06SSteven Whitehouse * @size: The amount to read 503b1e71b06SSteven Whitehouse * 504b1e71b06SSteven Whitehouse */ 505b1e71b06SSteven Whitehouse 5064306629eSAndrew Price int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, 5074306629eSAndrew Price unsigned size) 508b1e71b06SSteven Whitehouse { 509b1e71b06SSteven Whitehouse struct address_space *mapping = ip->i_inode.i_mapping; 51045eb0504SAndreas Gruenbacher unsigned long index = *pos >> PAGE_SHIFT; 51109cbfeafSKirill A. Shutemov unsigned offset = *pos & (PAGE_SIZE - 1); 512b1e71b06SSteven Whitehouse unsigned copied = 0; 513b1e71b06SSteven Whitehouse unsigned amt; 514b1e71b06SSteven Whitehouse struct page *page; 515b1e71b06SSteven Whitehouse void *p; 516b1e71b06SSteven Whitehouse 517b1e71b06SSteven Whitehouse do { 518b1e71b06SSteven Whitehouse amt = size - copied; 51909cbfeafSKirill A. Shutemov if (offset + size > PAGE_SIZE) 52009cbfeafSKirill A. Shutemov amt = PAGE_SIZE - offset; 521b1e71b06SSteven Whitehouse page = read_cache_page(mapping, index, __gfs2_readpage, NULL); 522b1e71b06SSteven Whitehouse if (IS_ERR(page)) 523b1e71b06SSteven Whitehouse return PTR_ERR(page); 524d9349285SCong Wang p = kmap_atomic(page); 525b1e71b06SSteven Whitehouse memcpy(buf + copied, p + offset, amt); 526d9349285SCong Wang kunmap_atomic(p); 52709cbfeafSKirill A. Shutemov put_page(page); 528b1e71b06SSteven Whitehouse copied += amt; 529b1e71b06SSteven Whitehouse index++; 530b1e71b06SSteven Whitehouse offset = 0; 531b1e71b06SSteven Whitehouse } while(copied < size); 532b1e71b06SSteven Whitehouse (*pos) += size; 533b1e71b06SSteven Whitehouse return size; 534b1e71b06SSteven Whitehouse } 535b1e71b06SSteven Whitehouse 536b1e71b06SSteven Whitehouse /** 537d4388340SMatthew Wilcox (Oracle) * gfs2_readahead - Read a bunch of pages at once 5381272574bSFabian Frederick * @file: The file to read from 5391272574bSFabian Frederick * @mapping: Address space info 5401272574bSFabian Frederick * @pages: List of pages to read 5411272574bSFabian Frederick * @nr_pages: Number of pages to read 542b1e71b06SSteven Whitehouse * 543b1e71b06SSteven Whitehouse * Some notes: 544b1e71b06SSteven Whitehouse * 1. This is only for readahead, so we can simply ignore any things 545b1e71b06SSteven Whitehouse * which are slightly inconvenient (such as locking conflicts between 546b1e71b06SSteven Whitehouse * the page lock and the glock) and return having done no I/O. Its 547b1e71b06SSteven Whitehouse * obviously not something we'd want to do on too regular a basis. 548b1e71b06SSteven Whitehouse * Any I/O we ignore at this time will be done via readpage later. 549b1e71b06SSteven Whitehouse * 2. We don't handle stuffed files here we let readpage do the honours. 550d4388340SMatthew Wilcox (Oracle) * 3. mpage_readahead() does most of the heavy lifting in the common case. 551b1e71b06SSteven Whitehouse * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. 552b1e71b06SSteven Whitehouse */ 553b1e71b06SSteven Whitehouse 554d4388340SMatthew Wilcox (Oracle) static void gfs2_readahead(struct readahead_control *rac) 555b1e71b06SSteven Whitehouse { 556d4388340SMatthew Wilcox (Oracle) struct inode *inode = rac->mapping->host; 557b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 558b1e71b06SSteven Whitehouse 5592164f9b9SChristoph Hellwig if (gfs2_is_stuffed(ip)) 5602164f9b9SChristoph Hellwig ; 5612164f9b9SChristoph Hellwig else if (gfs2_is_jdata(ip)) 562d4388340SMatthew Wilcox (Oracle) mpage_readahead(rac, gfs2_block_map); 5632164f9b9SChristoph Hellwig else 5642164f9b9SChristoph Hellwig iomap_readahead(rac, &gfs2_iomap_ops); 565b1e71b06SSteven Whitehouse } 566b1e71b06SSteven Whitehouse 567b1e71b06SSteven Whitehouse /** 568b1e71b06SSteven Whitehouse * adjust_fs_space - Adjusts the free space available due to gfs2_grow 569b1e71b06SSteven Whitehouse * @inode: the rindex inode 570b1e71b06SSteven Whitehouse */ 57164bc06bbSAndreas Gruenbacher void adjust_fs_space(struct inode *inode) 572b1e71b06SSteven Whitehouse { 573d0a22a4bSAndreas Gruenbacher struct gfs2_sbd *sdp = GFS2_SB(inode); 5741946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 5751946f70aSBenjamin Marzinski struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 576b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 577b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 5781946f70aSBenjamin Marzinski struct buffer_head *m_bh, *l_bh; 579b1e71b06SSteven Whitehouse u64 fs_total, new_free; 580b1e71b06SSteven Whitehouse 581d0a22a4bSAndreas Gruenbacher if (gfs2_trans_begin(sdp, 2 * RES_STATFS, 0) != 0) 582d0a22a4bSAndreas Gruenbacher return; 583d0a22a4bSAndreas Gruenbacher 584b1e71b06SSteven Whitehouse /* Total up the file system space, according to the latest rindex. */ 585b1e71b06SSteven Whitehouse fs_total = gfs2_ri_total(sdp); 5861946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) 587d0a22a4bSAndreas Gruenbacher goto out; 588b1e71b06SSteven Whitehouse 589b1e71b06SSteven Whitehouse spin_lock(&sdp->sd_statfs_spin); 5901946f70aSBenjamin Marzinski gfs2_statfs_change_in(m_sc, m_bh->b_data + 5911946f70aSBenjamin Marzinski sizeof(struct gfs2_dinode)); 592b1e71b06SSteven Whitehouse if (fs_total > (m_sc->sc_total + l_sc->sc_total)) 593b1e71b06SSteven Whitehouse new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); 594b1e71b06SSteven Whitehouse else 595b1e71b06SSteven Whitehouse new_free = 0; 596b1e71b06SSteven Whitehouse spin_unlock(&sdp->sd_statfs_spin); 597b1e71b06SSteven Whitehouse fs_warn(sdp, "File system extended by %llu blocks.\n", 598b1e71b06SSteven Whitehouse (unsigned long long)new_free); 599b1e71b06SSteven Whitehouse gfs2_statfs_change(sdp, new_free, new_free, 0); 6001946f70aSBenjamin Marzinski 6011946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) 602d0a22a4bSAndreas Gruenbacher goto out2; 6031946f70aSBenjamin Marzinski update_statfs(sdp, m_bh, l_bh); 6041946f70aSBenjamin Marzinski brelse(l_bh); 605d0a22a4bSAndreas Gruenbacher out2: 6061946f70aSBenjamin Marzinski brelse(m_bh); 607d0a22a4bSAndreas Gruenbacher out: 608d0a22a4bSAndreas Gruenbacher sdp->sd_rindex_uptodate = 0; 609d0a22a4bSAndreas Gruenbacher gfs2_trans_end(sdp); 610b1e71b06SSteven Whitehouse } 611b1e71b06SSteven Whitehouse 612b1e71b06SSteven Whitehouse /** 613b9e03f18SBob Peterson * jdata_set_page_dirty - Page dirtying function 614b1e71b06SSteven Whitehouse * @page: The page to dirty 615b1e71b06SSteven Whitehouse * 616b1e71b06SSteven Whitehouse * Returns: 1 if it dirtyed the page, or 0 otherwise 617b1e71b06SSteven Whitehouse */ 618b1e71b06SSteven Whitehouse 619b9e03f18SBob Peterson static int jdata_set_page_dirty(struct page *page) 620b1e71b06SSteven Whitehouse { 621b1e71b06SSteven Whitehouse SetPageChecked(page); 622b1e71b06SSteven Whitehouse return __set_page_dirty_buffers(page); 623b1e71b06SSteven Whitehouse } 624b1e71b06SSteven Whitehouse 625b1e71b06SSteven Whitehouse /** 626b1e71b06SSteven Whitehouse * gfs2_bmap - Block map function 627b1e71b06SSteven Whitehouse * @mapping: Address space info 628b1e71b06SSteven Whitehouse * @lblock: The block to map 629b1e71b06SSteven Whitehouse * 630b1e71b06SSteven Whitehouse * Returns: The disk address for the block or 0 on hole or error 631b1e71b06SSteven Whitehouse */ 632b1e71b06SSteven Whitehouse 633b1e71b06SSteven Whitehouse static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) 634b1e71b06SSteven Whitehouse { 635b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 636b1e71b06SSteven Whitehouse struct gfs2_holder i_gh; 637b1e71b06SSteven Whitehouse sector_t dblock = 0; 638b1e71b06SSteven Whitehouse int error; 639b1e71b06SSteven Whitehouse 640b1e71b06SSteven Whitehouse error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 641b1e71b06SSteven Whitehouse if (error) 642b1e71b06SSteven Whitehouse return 0; 643b1e71b06SSteven Whitehouse 644b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 6457770c93aSChristoph Hellwig dblock = iomap_bmap(mapping, lblock, &gfs2_iomap_ops); 646b1e71b06SSteven Whitehouse 647b1e71b06SSteven Whitehouse gfs2_glock_dq_uninit(&i_gh); 648b1e71b06SSteven Whitehouse 649b1e71b06SSteven Whitehouse return dblock; 650b1e71b06SSteven Whitehouse } 651b1e71b06SSteven Whitehouse 652b1e71b06SSteven Whitehouse static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) 653b1e71b06SSteven Whitehouse { 654b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 655b1e71b06SSteven Whitehouse 656b1e71b06SSteven Whitehouse lock_buffer(bh); 657b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 658b1e71b06SSteven Whitehouse clear_buffer_dirty(bh); 659b1e71b06SSteven Whitehouse bd = bh->b_private; 660b1e71b06SSteven Whitehouse if (bd) { 661c0752aa7SBob Peterson if (!list_empty(&bd->bd_list) && !buffer_pinned(bh)) 662c0752aa7SBob Peterson list_del_init(&bd->bd_list); 663b1e71b06SSteven Whitehouse else 66468cd4ce2SBob Peterson gfs2_remove_from_journal(bh, REMOVE_JDATA); 665b1e71b06SSteven Whitehouse } 666b1e71b06SSteven Whitehouse bh->b_bdev = NULL; 667b1e71b06SSteven Whitehouse clear_buffer_mapped(bh); 668b1e71b06SSteven Whitehouse clear_buffer_req(bh); 669b1e71b06SSteven Whitehouse clear_buffer_new(bh); 670b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 671b1e71b06SSteven Whitehouse unlock_buffer(bh); 672b1e71b06SSteven Whitehouse } 673b1e71b06SSteven Whitehouse 674d47992f8SLukas Czerner static void gfs2_invalidatepage(struct page *page, unsigned int offset, 675d47992f8SLukas Czerner unsigned int length) 676b1e71b06SSteven Whitehouse { 677b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 6785c0bb97cSLukas Czerner unsigned int stop = offset + length; 67909cbfeafSKirill A. Shutemov int partial_page = (offset || length < PAGE_SIZE); 680b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 681b1e71b06SSteven Whitehouse unsigned long pos = 0; 682b1e71b06SSteven Whitehouse 683b1e71b06SSteven Whitehouse BUG_ON(!PageLocked(page)); 6845c0bb97cSLukas Czerner if (!partial_page) 685b1e71b06SSteven Whitehouse ClearPageChecked(page); 686b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 687b1e71b06SSteven Whitehouse goto out; 688b1e71b06SSteven Whitehouse 689b1e71b06SSteven Whitehouse bh = head = page_buffers(page); 690b1e71b06SSteven Whitehouse do { 6915c0bb97cSLukas Czerner if (pos + bh->b_size > stop) 6925c0bb97cSLukas Czerner return; 6935c0bb97cSLukas Czerner 694b1e71b06SSteven Whitehouse if (offset <= pos) 695b1e71b06SSteven Whitehouse gfs2_discard(sdp, bh); 696b1e71b06SSteven Whitehouse pos += bh->b_size; 697b1e71b06SSteven Whitehouse bh = bh->b_this_page; 698b1e71b06SSteven Whitehouse } while (bh != head); 699b1e71b06SSteven Whitehouse out: 7005c0bb97cSLukas Czerner if (!partial_page) 701b1e71b06SSteven Whitehouse try_to_release_page(page, 0); 702b1e71b06SSteven Whitehouse } 703b1e71b06SSteven Whitehouse 704b1e71b06SSteven Whitehouse /** 705b1e71b06SSteven Whitehouse * gfs2_releasepage - free the metadata associated with a page 706b1e71b06SSteven Whitehouse * @page: the page that's being released 707b1e71b06SSteven Whitehouse * @gfp_mask: passed from Linux VFS, ignored by us 708b1e71b06SSteven Whitehouse * 7090ebbe4f9SAndreas Gruenbacher * Calls try_to_free_buffers() to free the buffers and put the page if the 7100ebbe4f9SAndreas Gruenbacher * buffers can be released. 711b1e71b06SSteven Whitehouse * 7120ebbe4f9SAndreas Gruenbacher * Returns: 1 if the page was put or else 0 713b1e71b06SSteven Whitehouse */ 714b1e71b06SSteven Whitehouse 715b1e71b06SSteven Whitehouse int gfs2_releasepage(struct page *page, gfp_t gfp_mask) 716b1e71b06SSteven Whitehouse { 717009d8518SSteven Whitehouse struct address_space *mapping = page->mapping; 718009d8518SSteven Whitehouse struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 719b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 720b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 721b1e71b06SSteven Whitehouse 722b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 723b1e71b06SSteven Whitehouse return 0; 724b1e71b06SSteven Whitehouse 7251c185c02SAndreas Gruenbacher /* 7261c185c02SAndreas Gruenbacher * From xfs_vm_releasepage: mm accommodates an old ext3 case where 7271c185c02SAndreas Gruenbacher * clean pages might not have had the dirty bit cleared. Thus, it can 7281c185c02SAndreas Gruenbacher * send actual dirty pages to ->releasepage() via shrink_active_list(). 7291c185c02SAndreas Gruenbacher * 7301c185c02SAndreas Gruenbacher * As a workaround, we skip pages that contain dirty buffers below. 7311c185c02SAndreas Gruenbacher * Once ->releasepage isn't called on dirty pages anymore, we can warn 7321c185c02SAndreas Gruenbacher * on dirty buffers like we used to here again. 7331c185c02SAndreas Gruenbacher */ 7341c185c02SAndreas Gruenbacher 735b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 736380f7c65SSteven Whitehouse spin_lock(&sdp->sd_ail_lock); 737b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 738b1e71b06SSteven Whitehouse do { 739b1e71b06SSteven Whitehouse if (atomic_read(&bh->b_count)) 740b1e71b06SSteven Whitehouse goto cannot_release; 741b1e71b06SSteven Whitehouse bd = bh->b_private; 74216ca9412SBenjamin Marzinski if (bd && bd->bd_tr) 743b1e71b06SSteven Whitehouse goto cannot_release; 7441c185c02SAndreas Gruenbacher if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh))) 7451c185c02SAndreas Gruenbacher goto cannot_release; 746b1e71b06SSteven Whitehouse bh = bh->b_this_page; 747b1e71b06SSteven Whitehouse } while(bh != head); 748380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 749b1e71b06SSteven Whitehouse 750b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 751b1e71b06SSteven Whitehouse do { 752b1e71b06SSteven Whitehouse bd = bh->b_private; 753b1e71b06SSteven Whitehouse if (bd) { 754b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, bd->bd_bh == bh); 755b1e71b06SSteven Whitehouse bd->bd_bh = NULL; 756b1e71b06SSteven Whitehouse bh->b_private = NULL; 757019dd669SBob Peterson /* 758019dd669SBob Peterson * The bd may still be queued as a revoke, in which 759019dd669SBob Peterson * case we must not dequeue nor free it. 760019dd669SBob Peterson */ 761019dd669SBob Peterson if (!bd->bd_blkno && !list_empty(&bd->bd_list)) 762019dd669SBob Peterson list_del_init(&bd->bd_list); 763019dd669SBob Peterson if (list_empty(&bd->bd_list)) 764b1e71b06SSteven Whitehouse kmem_cache_free(gfs2_bufdata_cachep, bd); 765e4f29206SSteven Whitehouse } 766b1e71b06SSteven Whitehouse 767b1e71b06SSteven Whitehouse bh = bh->b_this_page; 768b1e71b06SSteven Whitehouse } while (bh != head); 769e4f29206SSteven Whitehouse gfs2_log_unlock(sdp); 770b1e71b06SSteven Whitehouse 771b1e71b06SSteven Whitehouse return try_to_free_buffers(page); 7728f065d36SSteven Whitehouse 773b1e71b06SSteven Whitehouse cannot_release: 774380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 775b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 776b1e71b06SSteven Whitehouse return 0; 777b1e71b06SSteven Whitehouse } 778b1e71b06SSteven Whitehouse 779eadd7535SChristoph Hellwig static const struct address_space_operations gfs2_aops = { 7809d358143SSteven Whitehouse .writepage = gfs2_writepage, 78145138990SSteven Whitehouse .writepages = gfs2_writepages, 782b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 783d4388340SMatthew Wilcox (Oracle) .readahead = gfs2_readahead, 7842164f9b9SChristoph Hellwig .set_page_dirty = iomap_set_page_dirty, 7852164f9b9SChristoph Hellwig .releasepage = iomap_releasepage, 7862164f9b9SChristoph Hellwig .invalidatepage = iomap_invalidatepage, 787b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 788967bcc91SAndreas Gruenbacher .direct_IO = noop_direct_IO, 7892164f9b9SChristoph Hellwig .migratepage = iomap_migrate_page, 7902164f9b9SChristoph Hellwig .is_partially_uptodate = iomap_is_partially_uptodate, 791aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 792b1e71b06SSteven Whitehouse }; 793b1e71b06SSteven Whitehouse 794b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_jdata_aops = { 795b1e71b06SSteven Whitehouse .writepage = gfs2_jdata_writepage, 796b1e71b06SSteven Whitehouse .writepages = gfs2_jdata_writepages, 797b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 798d4388340SMatthew Wilcox (Oracle) .readahead = gfs2_readahead, 799b9e03f18SBob Peterson .set_page_dirty = jdata_set_page_dirty, 800b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 801b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 802b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 803b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 804aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 805b1e71b06SSteven Whitehouse }; 806b1e71b06SSteven Whitehouse 807b1e71b06SSteven Whitehouse void gfs2_set_aops(struct inode *inode) 808b1e71b06SSteven Whitehouse { 809eadd7535SChristoph Hellwig if (gfs2_is_jdata(GFS2_I(inode))) 810b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_jdata_aops; 811b1e71b06SSteven Whitehouse else 812eadd7535SChristoph Hellwig inode->i_mapping->a_ops = &gfs2_aops; 813b1e71b06SSteven Whitehouse } 814