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); 94b1e71b06SSteven Whitehouse loff_t i_size = i_size_read(inode); 9509cbfeafSKirill A. Shutemov pgoff_t end_index = i_size >> PAGE_SHIFT; 96b1e71b06SSteven Whitehouse unsigned offset; 97b1e71b06SSteven Whitehouse 98b1e71b06SSteven Whitehouse if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 99b1e71b06SSteven Whitehouse goto out; 100b1e71b06SSteven Whitehouse if (current->journal_info) 101b1e71b06SSteven Whitehouse goto redirty; 102b1e71b06SSteven Whitehouse /* Is the page fully outside i_size? (truncate in progress) */ 10309cbfeafSKirill A. Shutemov offset = i_size & (PAGE_SIZE-1); 104b1e71b06SSteven Whitehouse if (page->index > end_index || (page->index == end_index && !offset)) { 10509cbfeafSKirill A. Shutemov page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 106b1e71b06SSteven Whitehouse goto out; 107b1e71b06SSteven Whitehouse } 10859c01c50SChristoph Hellwig 10959c01c50SChristoph Hellwig return nobh_writepage(page, gfs2_get_block_noalloc, wbc); 11059c01c50SChristoph Hellwig 111b1e71b06SSteven Whitehouse redirty: 112b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 113b1e71b06SSteven Whitehouse out: 114b1e71b06SSteven Whitehouse unlock_page(page); 115b1e71b06SSteven Whitehouse return 0; 116b1e71b06SSteven Whitehouse } 117b1e71b06SSteven Whitehouse 118fd4c5748SBenjamin Marzinski /* This is the same as calling block_write_full_page, but it also 119fd4c5748SBenjamin Marzinski * writes pages outside of i_size 120fd4c5748SBenjamin Marzinski */ 121c548a1c1SAndrew Price static int gfs2_write_full_page(struct page *page, get_block_t *get_block, 122fd4c5748SBenjamin Marzinski struct writeback_control *wbc) 123fd4c5748SBenjamin Marzinski { 124fd4c5748SBenjamin Marzinski struct inode * const inode = page->mapping->host; 125fd4c5748SBenjamin Marzinski loff_t i_size = i_size_read(inode); 126fd4c5748SBenjamin Marzinski const pgoff_t end_index = i_size >> PAGE_SHIFT; 127fd4c5748SBenjamin Marzinski unsigned offset; 128fd4c5748SBenjamin Marzinski 129fd4c5748SBenjamin Marzinski /* 130fd4c5748SBenjamin Marzinski * The page straddles i_size. It must be zeroed out on each and every 131fd4c5748SBenjamin Marzinski * writepage invocation because it may be mmapped. "A file is mapped 132fd4c5748SBenjamin Marzinski * in multiples of the page size. For a file that is not a multiple of 133fd4c5748SBenjamin Marzinski * the page size, the remaining memory is zeroed when mapped, and 134fd4c5748SBenjamin Marzinski * writes to that region are not written out to the file." 135fd4c5748SBenjamin Marzinski */ 136fd4c5748SBenjamin Marzinski offset = i_size & (PAGE_SIZE-1); 137fd4c5748SBenjamin Marzinski if (page->index == end_index && offset) 138fd4c5748SBenjamin Marzinski zero_user_segment(page, offset, PAGE_SIZE); 139fd4c5748SBenjamin Marzinski 140fd4c5748SBenjamin Marzinski return __block_write_full_page(inode, page, get_block, wbc, 141fd4c5748SBenjamin Marzinski end_buffer_async_write); 142fd4c5748SBenjamin Marzinski } 143fd4c5748SBenjamin Marzinski 144b1e71b06SSteven Whitehouse /** 145b1e71b06SSteven Whitehouse * __gfs2_jdata_writepage - The core of jdata writepage 146b1e71b06SSteven Whitehouse * @page: The page to write 147b1e71b06SSteven Whitehouse * @wbc: The writeback control 148b1e71b06SSteven Whitehouse * 149b1e71b06SSteven Whitehouse * This is shared between writepage and writepages and implements the 150b1e71b06SSteven Whitehouse * core of the writepage operation. If a transaction is required then 151b1e71b06SSteven Whitehouse * PageChecked will have been set and the transaction will have 152b1e71b06SSteven Whitehouse * already been started before this is called. 153b1e71b06SSteven Whitehouse */ 154b1e71b06SSteven Whitehouse 155b1e71b06SSteven Whitehouse static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 156b1e71b06SSteven Whitehouse { 157b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 158b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 159b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 160b1e71b06SSteven Whitehouse 161b1e71b06SSteven Whitehouse if (PageChecked(page)) { 162b1e71b06SSteven Whitehouse ClearPageChecked(page); 163b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) { 164b1e71b06SSteven Whitehouse create_empty_buffers(page, inode->i_sb->s_blocksize, 16547a9a527SFabian Frederick BIT(BH_Dirty)|BIT(BH_Uptodate)); 166b1e71b06SSteven Whitehouse } 16788b65ce5SAndreas Gruenbacher gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize); 168b1e71b06SSteven Whitehouse } 169fd4c5748SBenjamin Marzinski return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc); 170b1e71b06SSteven Whitehouse } 171b1e71b06SSteven Whitehouse 172b1e71b06SSteven Whitehouse /** 173b1e71b06SSteven Whitehouse * gfs2_jdata_writepage - Write complete page 174b1e71b06SSteven Whitehouse * @page: Page to write 1751272574bSFabian Frederick * @wbc: The writeback control 176b1e71b06SSteven Whitehouse * 177b1e71b06SSteven Whitehouse * Returns: errno 178b1e71b06SSteven Whitehouse * 179b1e71b06SSteven Whitehouse */ 180b1e71b06SSteven Whitehouse 181b1e71b06SSteven Whitehouse static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 182b1e71b06SSteven Whitehouse { 183b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 184fd4c5748SBenjamin Marzinski struct gfs2_inode *ip = GFS2_I(inode); 185b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 186b1e71b06SSteven Whitehouse int ret; 187b1e71b06SSteven Whitehouse 188fd4c5748SBenjamin Marzinski if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 189fd4c5748SBenjamin Marzinski goto out; 190fd4c5748SBenjamin Marzinski if (PageChecked(page) || current->journal_info) 191b1e71b06SSteven Whitehouse goto out_ignore; 192b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 193b1e71b06SSteven Whitehouse return ret; 194b1e71b06SSteven Whitehouse 195b1e71b06SSteven Whitehouse out_ignore: 196b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 197fd4c5748SBenjamin Marzinski out: 198b1e71b06SSteven Whitehouse unlock_page(page); 199b1e71b06SSteven Whitehouse return 0; 200b1e71b06SSteven Whitehouse } 201b1e71b06SSteven Whitehouse 202b1e71b06SSteven Whitehouse /** 20345138990SSteven Whitehouse * gfs2_writepages - Write a bunch of dirty pages back to disk 204b1e71b06SSteven Whitehouse * @mapping: The mapping to write 205b1e71b06SSteven Whitehouse * @wbc: Write-back control 206b1e71b06SSteven Whitehouse * 20745138990SSteven Whitehouse * Used for both ordered and writeback modes. 208b1e71b06SSteven Whitehouse */ 20945138990SSteven Whitehouse static int gfs2_writepages(struct address_space *mapping, 210b1e71b06SSteven Whitehouse struct writeback_control *wbc) 211b1e71b06SSteven Whitehouse { 212b066a4eeSAbhi Das struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 213b066a4eeSAbhi Das int ret = mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); 214b066a4eeSAbhi Das 215b066a4eeSAbhi Das /* 216b066a4eeSAbhi Das * Even if we didn't write any pages here, we might still be holding 217b066a4eeSAbhi Das * dirty pages in the ail. We forcibly flush the ail because we don't 218b066a4eeSAbhi Das * want balance_dirty_pages() to loop indefinitely trying to write out 219b066a4eeSAbhi Das * pages held in the ail that it can't find. 220b066a4eeSAbhi Das */ 221b066a4eeSAbhi Das if (ret == 0) 222b066a4eeSAbhi Das set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags); 223b066a4eeSAbhi Das 224b066a4eeSAbhi Das return ret; 225b1e71b06SSteven Whitehouse } 226b1e71b06SSteven Whitehouse 227b1e71b06SSteven Whitehouse /** 228b1e71b06SSteven Whitehouse * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages 229b1e71b06SSteven Whitehouse * @mapping: The mapping 230b1e71b06SSteven Whitehouse * @wbc: The writeback control 231b1e71b06SSteven Whitehouse * @pvec: The vector of pages 232b1e71b06SSteven Whitehouse * @nr_pages: The number of pages to write 2331272574bSFabian Frederick * @done_index: Page index 234b1e71b06SSteven Whitehouse * 235b1e71b06SSteven Whitehouse * Returns: non-zero if loop should terminate, zero otherwise 236b1e71b06SSteven Whitehouse */ 237b1e71b06SSteven Whitehouse 238b1e71b06SSteven Whitehouse static int gfs2_write_jdata_pagevec(struct address_space *mapping, 239b1e71b06SSteven Whitehouse struct writeback_control *wbc, 240b1e71b06SSteven Whitehouse struct pagevec *pvec, 2419aa01593SAndreas Gruenbacher int nr_pages, 242774016b2SSteven Whitehouse pgoff_t *done_index) 243b1e71b06SSteven Whitehouse { 244b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 245b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 24609cbfeafSKirill A. Shutemov unsigned nrblocks = nr_pages * (PAGE_SIZE/inode->i_sb->s_blocksize); 247b1e71b06SSteven Whitehouse int i; 248b1e71b06SSteven Whitehouse int ret; 249b1e71b06SSteven Whitehouse 250b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); 251b1e71b06SSteven Whitehouse if (ret < 0) 252b1e71b06SSteven Whitehouse return ret; 253b1e71b06SSteven Whitehouse 254b1e71b06SSteven Whitehouse for(i = 0; i < nr_pages; i++) { 255b1e71b06SSteven Whitehouse struct page *page = pvec->pages[i]; 256b1e71b06SSteven Whitehouse 257774016b2SSteven Whitehouse *done_index = page->index; 258774016b2SSteven Whitehouse 259b1e71b06SSteven Whitehouse lock_page(page); 260b1e71b06SSteven Whitehouse 261b1e71b06SSteven Whitehouse if (unlikely(page->mapping != mapping)) { 262774016b2SSteven Whitehouse continue_unlock: 263b1e71b06SSteven Whitehouse unlock_page(page); 264b1e71b06SSteven Whitehouse continue; 265b1e71b06SSteven Whitehouse } 266b1e71b06SSteven Whitehouse 267774016b2SSteven Whitehouse if (!PageDirty(page)) { 268774016b2SSteven Whitehouse /* someone wrote it for us */ 269774016b2SSteven Whitehouse goto continue_unlock; 270b1e71b06SSteven Whitehouse } 271b1e71b06SSteven Whitehouse 272774016b2SSteven Whitehouse if (PageWriteback(page)) { 273b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_NONE) 274b1e71b06SSteven Whitehouse wait_on_page_writeback(page); 275774016b2SSteven Whitehouse else 276774016b2SSteven Whitehouse goto continue_unlock; 277b1e71b06SSteven Whitehouse } 278b1e71b06SSteven Whitehouse 279774016b2SSteven Whitehouse BUG_ON(PageWriteback(page)); 280774016b2SSteven Whitehouse if (!clear_page_dirty_for_io(page)) 281774016b2SSteven Whitehouse goto continue_unlock; 282774016b2SSteven Whitehouse 283de1414a6SChristoph Hellwig trace_wbc_writepage(wbc, inode_to_bdi(inode)); 284b1e71b06SSteven Whitehouse 285b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 286774016b2SSteven Whitehouse if (unlikely(ret)) { 287774016b2SSteven Whitehouse if (ret == AOP_WRITEPAGE_ACTIVATE) { 288774016b2SSteven Whitehouse unlock_page(page); 289774016b2SSteven Whitehouse ret = 0; 290774016b2SSteven Whitehouse } else { 291b1e71b06SSteven Whitehouse 292774016b2SSteven Whitehouse /* 293774016b2SSteven Whitehouse * done_index is set past this page, 294774016b2SSteven Whitehouse * so media errors will not choke 295774016b2SSteven Whitehouse * background writeout for the entire 296774016b2SSteven Whitehouse * file. This has consequences for 297774016b2SSteven Whitehouse * range_cyclic semantics (ie. it may 298774016b2SSteven Whitehouse * not be suitable for data integrity 299774016b2SSteven Whitehouse * writeout). 300774016b2SSteven Whitehouse */ 301774016b2SSteven Whitehouse *done_index = page->index + 1; 302b1e71b06SSteven Whitehouse ret = 1; 303774016b2SSteven Whitehouse break; 304774016b2SSteven Whitehouse } 305774016b2SSteven Whitehouse } 306774016b2SSteven Whitehouse 307774016b2SSteven Whitehouse /* 308774016b2SSteven Whitehouse * We stop writing back only if we are not doing 309774016b2SSteven Whitehouse * integrity sync. In case of integrity sync we have to 310774016b2SSteven Whitehouse * keep going until we have written all the pages 311774016b2SSteven Whitehouse * we tagged for writeback prior to entering this loop. 312774016b2SSteven Whitehouse */ 313774016b2SSteven Whitehouse if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) { 314774016b2SSteven Whitehouse ret = 1; 315774016b2SSteven Whitehouse break; 316774016b2SSteven Whitehouse } 317774016b2SSteven Whitehouse 318b1e71b06SSteven Whitehouse } 319b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 320b1e71b06SSteven Whitehouse return ret; 321b1e71b06SSteven Whitehouse } 322b1e71b06SSteven Whitehouse 323b1e71b06SSteven Whitehouse /** 324b1e71b06SSteven Whitehouse * gfs2_write_cache_jdata - Like write_cache_pages but different 325b1e71b06SSteven Whitehouse * @mapping: The mapping to write 326b1e71b06SSteven Whitehouse * @wbc: The writeback control 327b1e71b06SSteven Whitehouse * 328b1e71b06SSteven Whitehouse * The reason that we use our own function here is that we need to 329b1e71b06SSteven Whitehouse * start transactions before we grab page locks. This allows us 330b1e71b06SSteven Whitehouse * to get the ordering right. 331b1e71b06SSteven Whitehouse */ 332b1e71b06SSteven Whitehouse 333b1e71b06SSteven Whitehouse static int gfs2_write_cache_jdata(struct address_space *mapping, 334b1e71b06SSteven Whitehouse struct writeback_control *wbc) 335b1e71b06SSteven Whitehouse { 336b1e71b06SSteven Whitehouse int ret = 0; 337b1e71b06SSteven Whitehouse int done = 0; 338b1e71b06SSteven Whitehouse struct pagevec pvec; 339b1e71b06SSteven Whitehouse int nr_pages; 340774016b2SSteven Whitehouse pgoff_t uninitialized_var(writeback_index); 341b1e71b06SSteven Whitehouse pgoff_t index; 342b1e71b06SSteven Whitehouse pgoff_t end; 343774016b2SSteven Whitehouse pgoff_t done_index; 344774016b2SSteven Whitehouse int cycled; 345b1e71b06SSteven Whitehouse int range_whole = 0; 34610bbd235SMatthew Wilcox xa_mark_t tag; 347b1e71b06SSteven Whitehouse 34886679820SMel Gorman pagevec_init(&pvec); 349b1e71b06SSteven Whitehouse if (wbc->range_cyclic) { 350774016b2SSteven Whitehouse writeback_index = mapping->writeback_index; /* prev offset */ 351774016b2SSteven Whitehouse index = writeback_index; 352774016b2SSteven Whitehouse if (index == 0) 353774016b2SSteven Whitehouse cycled = 1; 354774016b2SSteven Whitehouse else 355774016b2SSteven Whitehouse cycled = 0; 356b1e71b06SSteven Whitehouse end = -1; 357b1e71b06SSteven Whitehouse } else { 35809cbfeafSKirill A. Shutemov index = wbc->range_start >> PAGE_SHIFT; 35909cbfeafSKirill A. Shutemov end = wbc->range_end >> PAGE_SHIFT; 360b1e71b06SSteven Whitehouse if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 361b1e71b06SSteven Whitehouse range_whole = 1; 362774016b2SSteven Whitehouse cycled = 1; /* ignore range_cyclic tests */ 363b1e71b06SSteven Whitehouse } 364774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 365774016b2SSteven Whitehouse tag = PAGECACHE_TAG_TOWRITE; 366774016b2SSteven Whitehouse else 367774016b2SSteven Whitehouse tag = PAGECACHE_TAG_DIRTY; 368b1e71b06SSteven Whitehouse 369b1e71b06SSteven Whitehouse retry: 370774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 371774016b2SSteven Whitehouse tag_pages_for_writeback(mapping, index, end); 372774016b2SSteven Whitehouse done_index = index; 373774016b2SSteven Whitehouse while (!done && (index <= end)) { 374d2bc5b3cSJan Kara nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end, 37567fd707fSJan Kara tag); 376774016b2SSteven Whitehouse if (nr_pages == 0) 377774016b2SSteven Whitehouse break; 378774016b2SSteven Whitehouse 3799aa01593SAndreas Gruenbacher ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, &done_index); 380b1e71b06SSteven Whitehouse if (ret) 381b1e71b06SSteven Whitehouse done = 1; 382b1e71b06SSteven Whitehouse if (ret > 0) 383b1e71b06SSteven Whitehouse ret = 0; 384b1e71b06SSteven Whitehouse pagevec_release(&pvec); 385b1e71b06SSteven Whitehouse cond_resched(); 386b1e71b06SSteven Whitehouse } 387b1e71b06SSteven Whitehouse 388774016b2SSteven Whitehouse if (!cycled && !done) { 389b1e71b06SSteven Whitehouse /* 390774016b2SSteven Whitehouse * range_cyclic: 391b1e71b06SSteven Whitehouse * We hit the last page and there is more work to be done: wrap 392b1e71b06SSteven Whitehouse * back to the start of the file 393b1e71b06SSteven Whitehouse */ 394774016b2SSteven Whitehouse cycled = 1; 395b1e71b06SSteven Whitehouse index = 0; 396774016b2SSteven Whitehouse end = writeback_index - 1; 397b1e71b06SSteven Whitehouse goto retry; 398b1e71b06SSteven Whitehouse } 399b1e71b06SSteven Whitehouse 400b1e71b06SSteven Whitehouse if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 401774016b2SSteven Whitehouse mapping->writeback_index = done_index; 402774016b2SSteven Whitehouse 403b1e71b06SSteven Whitehouse return ret; 404b1e71b06SSteven Whitehouse } 405b1e71b06SSteven Whitehouse 406b1e71b06SSteven Whitehouse 407b1e71b06SSteven Whitehouse /** 408b1e71b06SSteven Whitehouse * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk 409b1e71b06SSteven Whitehouse * @mapping: The mapping to write 410b1e71b06SSteven Whitehouse * @wbc: The writeback control 411b1e71b06SSteven Whitehouse * 412b1e71b06SSteven Whitehouse */ 413b1e71b06SSteven Whitehouse 414b1e71b06SSteven Whitehouse static int gfs2_jdata_writepages(struct address_space *mapping, 415b1e71b06SSteven Whitehouse struct writeback_control *wbc) 416b1e71b06SSteven Whitehouse { 417b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 418b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 419b1e71b06SSteven Whitehouse int ret; 420b1e71b06SSteven Whitehouse 421b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 422b1e71b06SSteven Whitehouse if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { 423805c0907SBob Peterson gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | 424805c0907SBob Peterson GFS2_LFC_JDATA_WPAGES); 425b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 426b1e71b06SSteven Whitehouse } 427b1e71b06SSteven Whitehouse return ret; 428b1e71b06SSteven Whitehouse } 429b1e71b06SSteven Whitehouse 430b1e71b06SSteven Whitehouse /** 431b1e71b06SSteven Whitehouse * stuffed_readpage - Fill in a Linux page with stuffed file data 432b1e71b06SSteven Whitehouse * @ip: the inode 433b1e71b06SSteven Whitehouse * @page: the page 434b1e71b06SSteven Whitehouse * 435b1e71b06SSteven Whitehouse * Returns: errno 436b1e71b06SSteven Whitehouse */ 437378b6cbfSChristoph Hellwig static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) 438b1e71b06SSteven Whitehouse { 439b1e71b06SSteven Whitehouse struct buffer_head *dibh; 440602c89d2SSteven Whitehouse u64 dsize = i_size_read(&ip->i_inode); 441b1e71b06SSteven Whitehouse void *kaddr; 442b1e71b06SSteven Whitehouse int error; 443b1e71b06SSteven Whitehouse 444b1e71b06SSteven Whitehouse /* 445b1e71b06SSteven Whitehouse * Due to the order of unstuffing files and ->fault(), we can be 446b1e71b06SSteven Whitehouse * asked for a zero page in the case of a stuffed file being extended, 447b1e71b06SSteven Whitehouse * so we need to supply one here. It doesn't happen often. 448b1e71b06SSteven Whitehouse */ 449b1e71b06SSteven Whitehouse if (unlikely(page->index)) { 45009cbfeafSKirill A. Shutemov zero_user(page, 0, PAGE_SIZE); 451b1e71b06SSteven Whitehouse SetPageUptodate(page); 452b1e71b06SSteven Whitehouse return 0; 453b1e71b06SSteven Whitehouse } 454b1e71b06SSteven Whitehouse 455b1e71b06SSteven Whitehouse error = gfs2_meta_inode_buffer(ip, &dibh); 456b1e71b06SSteven Whitehouse if (error) 457b1e71b06SSteven Whitehouse return error; 458b1e71b06SSteven Whitehouse 459d9349285SCong Wang kaddr = kmap_atomic(page); 460235628c5SAndreas Gruenbacher if (dsize > gfs2_max_stuffed_size(ip)) 461235628c5SAndreas Gruenbacher dsize = gfs2_max_stuffed_size(ip); 462602c89d2SSteven Whitehouse memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); 46309cbfeafSKirill A. Shutemov memset(kaddr + dsize, 0, PAGE_SIZE - dsize); 464d9349285SCong Wang kunmap_atomic(kaddr); 465b1e71b06SSteven Whitehouse flush_dcache_page(page); 466b1e71b06SSteven Whitehouse brelse(dibh); 467b1e71b06SSteven Whitehouse SetPageUptodate(page); 468b1e71b06SSteven Whitehouse 469b1e71b06SSteven Whitehouse return 0; 470b1e71b06SSteven Whitehouse } 471b1e71b06SSteven Whitehouse 472b1e71b06SSteven Whitehouse 473b1e71b06SSteven Whitehouse /** 474b1e71b06SSteven Whitehouse * __gfs2_readpage - readpage 475b1e71b06SSteven Whitehouse * @file: The file to read a page for 476b1e71b06SSteven Whitehouse * @page: The page to read 477b1e71b06SSteven Whitehouse * 4789db115a0SAndreas Gruenbacher * This is the core of gfs2's readpage. It's used by the internal file 4799db115a0SAndreas Gruenbacher * reading code as in that case we already hold the glock. Also it's 480b1e71b06SSteven Whitehouse * called by gfs2_readpage() once the required lock has been granted. 481b1e71b06SSteven Whitehouse */ 482b1e71b06SSteven Whitehouse 483b1e71b06SSteven Whitehouse static int __gfs2_readpage(void *file, struct page *page) 484b1e71b06SSteven Whitehouse { 485b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(page->mapping->host); 486b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 487f95cbb44SAndreas Gruenbacher 488b1e71b06SSteven Whitehouse int error; 489b1e71b06SSteven Whitehouse 490f95cbb44SAndreas Gruenbacher if (i_blocksize(page->mapping->host) == PAGE_SIZE && 491f95cbb44SAndreas Gruenbacher !page_has_buffers(page)) { 492f95cbb44SAndreas Gruenbacher error = iomap_readpage(page, &gfs2_iomap_ops); 493f95cbb44SAndreas Gruenbacher } else if (gfs2_is_stuffed(ip)) { 494b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 495b1e71b06SSteven Whitehouse unlock_page(page); 496b1e71b06SSteven Whitehouse } else { 497b1e71b06SSteven Whitehouse error = mpage_readpage(page, gfs2_block_map); 498b1e71b06SSteven Whitehouse } 499b1e71b06SSteven Whitehouse 50004aea0caSBob Peterson if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags))) 501b1e71b06SSteven Whitehouse return -EIO; 502b1e71b06SSteven Whitehouse 503b1e71b06SSteven Whitehouse return error; 504b1e71b06SSteven Whitehouse } 505b1e71b06SSteven Whitehouse 506b1e71b06SSteven Whitehouse /** 507b1e71b06SSteven Whitehouse * gfs2_readpage - read a page of a file 508b1e71b06SSteven Whitehouse * @file: The file to read 509b1e71b06SSteven Whitehouse * @page: The page of the file 510b1e71b06SSteven Whitehouse * 511b1e71b06SSteven Whitehouse * This deals with the locking required. We have to unlock and 512b1e71b06SSteven Whitehouse * relock the page in order to get the locking in the right 513b1e71b06SSteven Whitehouse * order. 514b1e71b06SSteven Whitehouse */ 515b1e71b06SSteven Whitehouse 516b1e71b06SSteven Whitehouse static int gfs2_readpage(struct file *file, struct page *page) 517b1e71b06SSteven Whitehouse { 518b1e71b06SSteven Whitehouse struct address_space *mapping = page->mapping; 519b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 520b1e71b06SSteven Whitehouse struct gfs2_holder gh; 521b1e71b06SSteven Whitehouse int error; 522b1e71b06SSteven Whitehouse 523b1e71b06SSteven Whitehouse unlock_page(page); 524b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 525b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&gh); 526b1e71b06SSteven Whitehouse if (unlikely(error)) 527b1e71b06SSteven Whitehouse goto out; 528b1e71b06SSteven Whitehouse error = AOP_TRUNCATED_PAGE; 529b1e71b06SSteven Whitehouse lock_page(page); 530b1e71b06SSteven Whitehouse if (page->mapping == mapping && !PageUptodate(page)) 531b1e71b06SSteven Whitehouse error = __gfs2_readpage(file, page); 532b1e71b06SSteven Whitehouse else 533b1e71b06SSteven Whitehouse unlock_page(page); 534b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 535b1e71b06SSteven Whitehouse out: 536b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 537b1e71b06SSteven Whitehouse if (error && error != AOP_TRUNCATED_PAGE) 538b1e71b06SSteven Whitehouse lock_page(page); 539b1e71b06SSteven Whitehouse return error; 540b1e71b06SSteven Whitehouse } 541b1e71b06SSteven Whitehouse 542b1e71b06SSteven Whitehouse /** 543b1e71b06SSteven Whitehouse * gfs2_internal_read - read an internal file 544b1e71b06SSteven Whitehouse * @ip: The gfs2 inode 545b1e71b06SSteven Whitehouse * @buf: The buffer to fill 546b1e71b06SSteven Whitehouse * @pos: The file position 547b1e71b06SSteven Whitehouse * @size: The amount to read 548b1e71b06SSteven Whitehouse * 549b1e71b06SSteven Whitehouse */ 550b1e71b06SSteven Whitehouse 5514306629eSAndrew Price int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, 5524306629eSAndrew Price unsigned size) 553b1e71b06SSteven Whitehouse { 554b1e71b06SSteven Whitehouse struct address_space *mapping = ip->i_inode.i_mapping; 55509cbfeafSKirill A. Shutemov unsigned long index = *pos / PAGE_SIZE; 55609cbfeafSKirill A. Shutemov unsigned offset = *pos & (PAGE_SIZE - 1); 557b1e71b06SSteven Whitehouse unsigned copied = 0; 558b1e71b06SSteven Whitehouse unsigned amt; 559b1e71b06SSteven Whitehouse struct page *page; 560b1e71b06SSteven Whitehouse void *p; 561b1e71b06SSteven Whitehouse 562b1e71b06SSteven Whitehouse do { 563b1e71b06SSteven Whitehouse amt = size - copied; 56409cbfeafSKirill A. Shutemov if (offset + size > PAGE_SIZE) 56509cbfeafSKirill A. Shutemov amt = PAGE_SIZE - offset; 566b1e71b06SSteven Whitehouse page = read_cache_page(mapping, index, __gfs2_readpage, NULL); 567b1e71b06SSteven Whitehouse if (IS_ERR(page)) 568b1e71b06SSteven Whitehouse return PTR_ERR(page); 569d9349285SCong Wang p = kmap_atomic(page); 570b1e71b06SSteven Whitehouse memcpy(buf + copied, p + offset, amt); 571d9349285SCong Wang kunmap_atomic(p); 57209cbfeafSKirill A. Shutemov put_page(page); 573b1e71b06SSteven Whitehouse copied += amt; 574b1e71b06SSteven Whitehouse index++; 575b1e71b06SSteven Whitehouse offset = 0; 576b1e71b06SSteven Whitehouse } while(copied < size); 577b1e71b06SSteven Whitehouse (*pos) += size; 578b1e71b06SSteven Whitehouse return size; 579b1e71b06SSteven Whitehouse } 580b1e71b06SSteven Whitehouse 581b1e71b06SSteven Whitehouse /** 582b1e71b06SSteven Whitehouse * gfs2_readpages - Read a bunch of pages at once 5831272574bSFabian Frederick * @file: The file to read from 5841272574bSFabian Frederick * @mapping: Address space info 5851272574bSFabian Frederick * @pages: List of pages to read 5861272574bSFabian Frederick * @nr_pages: Number of pages to read 587b1e71b06SSteven Whitehouse * 588b1e71b06SSteven Whitehouse * Some notes: 589b1e71b06SSteven Whitehouse * 1. This is only for readahead, so we can simply ignore any things 590b1e71b06SSteven Whitehouse * which are slightly inconvenient (such as locking conflicts between 591b1e71b06SSteven Whitehouse * the page lock and the glock) and return having done no I/O. Its 592b1e71b06SSteven Whitehouse * obviously not something we'd want to do on too regular a basis. 593b1e71b06SSteven Whitehouse * Any I/O we ignore at this time will be done via readpage later. 594b1e71b06SSteven Whitehouse * 2. We don't handle stuffed files here we let readpage do the honours. 595b1e71b06SSteven Whitehouse * 3. mpage_readpages() does most of the heavy lifting in the common case. 596b1e71b06SSteven Whitehouse * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. 597b1e71b06SSteven Whitehouse */ 598b1e71b06SSteven Whitehouse 599b1e71b06SSteven Whitehouse static int gfs2_readpages(struct file *file, struct address_space *mapping, 600b1e71b06SSteven Whitehouse struct list_head *pages, unsigned nr_pages) 601b1e71b06SSteven Whitehouse { 602b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 603b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 604b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 605b1e71b06SSteven Whitehouse struct gfs2_holder gh; 606b1e71b06SSteven Whitehouse int ret; 607b1e71b06SSteven Whitehouse 608b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 609b1e71b06SSteven Whitehouse ret = gfs2_glock_nq(&gh); 610b1e71b06SSteven Whitehouse if (unlikely(ret)) 611b1e71b06SSteven Whitehouse goto out_uninit; 612b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 613b1e71b06SSteven Whitehouse ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); 614b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 615b1e71b06SSteven Whitehouse out_uninit: 616b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 61704aea0caSBob Peterson if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags))) 618b1e71b06SSteven Whitehouse ret = -EIO; 619b1e71b06SSteven Whitehouse return ret; 620b1e71b06SSteven Whitehouse } 621b1e71b06SSteven Whitehouse 622b1e71b06SSteven Whitehouse /** 623b1e71b06SSteven Whitehouse * adjust_fs_space - Adjusts the free space available due to gfs2_grow 624b1e71b06SSteven Whitehouse * @inode: the rindex inode 625b1e71b06SSteven Whitehouse */ 62664bc06bbSAndreas Gruenbacher void adjust_fs_space(struct inode *inode) 627b1e71b06SSteven Whitehouse { 628d0a22a4bSAndreas Gruenbacher struct gfs2_sbd *sdp = GFS2_SB(inode); 6291946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 6301946f70aSBenjamin Marzinski struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 631b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 632b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 6331946f70aSBenjamin Marzinski struct buffer_head *m_bh, *l_bh; 634b1e71b06SSteven Whitehouse u64 fs_total, new_free; 635b1e71b06SSteven Whitehouse 636d0a22a4bSAndreas Gruenbacher if (gfs2_trans_begin(sdp, 2 * RES_STATFS, 0) != 0) 637d0a22a4bSAndreas Gruenbacher return; 638d0a22a4bSAndreas Gruenbacher 639b1e71b06SSteven Whitehouse /* Total up the file system space, according to the latest rindex. */ 640b1e71b06SSteven Whitehouse fs_total = gfs2_ri_total(sdp); 6411946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) 642d0a22a4bSAndreas Gruenbacher goto out; 643b1e71b06SSteven Whitehouse 644b1e71b06SSteven Whitehouse spin_lock(&sdp->sd_statfs_spin); 6451946f70aSBenjamin Marzinski gfs2_statfs_change_in(m_sc, m_bh->b_data + 6461946f70aSBenjamin Marzinski sizeof(struct gfs2_dinode)); 647b1e71b06SSteven Whitehouse if (fs_total > (m_sc->sc_total + l_sc->sc_total)) 648b1e71b06SSteven Whitehouse new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); 649b1e71b06SSteven Whitehouse else 650b1e71b06SSteven Whitehouse new_free = 0; 651b1e71b06SSteven Whitehouse spin_unlock(&sdp->sd_statfs_spin); 652b1e71b06SSteven Whitehouse fs_warn(sdp, "File system extended by %llu blocks.\n", 653b1e71b06SSteven Whitehouse (unsigned long long)new_free); 654b1e71b06SSteven Whitehouse gfs2_statfs_change(sdp, new_free, new_free, 0); 6551946f70aSBenjamin Marzinski 6561946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) 657d0a22a4bSAndreas Gruenbacher goto out2; 6581946f70aSBenjamin Marzinski update_statfs(sdp, m_bh, l_bh); 6591946f70aSBenjamin Marzinski brelse(l_bh); 660d0a22a4bSAndreas Gruenbacher out2: 6611946f70aSBenjamin Marzinski brelse(m_bh); 662d0a22a4bSAndreas Gruenbacher out: 663d0a22a4bSAndreas Gruenbacher sdp->sd_rindex_uptodate = 0; 664d0a22a4bSAndreas Gruenbacher gfs2_trans_end(sdp); 665b1e71b06SSteven Whitehouse } 666b1e71b06SSteven Whitehouse 667b1e71b06SSteven Whitehouse /** 668b9e03f18SBob Peterson * jdata_set_page_dirty - Page dirtying function 669b1e71b06SSteven Whitehouse * @page: The page to dirty 670b1e71b06SSteven Whitehouse * 671b1e71b06SSteven Whitehouse * Returns: 1 if it dirtyed the page, or 0 otherwise 672b1e71b06SSteven Whitehouse */ 673b1e71b06SSteven Whitehouse 674b9e03f18SBob Peterson static int jdata_set_page_dirty(struct page *page) 675b1e71b06SSteven Whitehouse { 676b1e71b06SSteven Whitehouse SetPageChecked(page); 677b1e71b06SSteven Whitehouse return __set_page_dirty_buffers(page); 678b1e71b06SSteven Whitehouse } 679b1e71b06SSteven Whitehouse 680b1e71b06SSteven Whitehouse /** 681b1e71b06SSteven Whitehouse * gfs2_bmap - Block map function 682b1e71b06SSteven Whitehouse * @mapping: Address space info 683b1e71b06SSteven Whitehouse * @lblock: The block to map 684b1e71b06SSteven Whitehouse * 685b1e71b06SSteven Whitehouse * Returns: The disk address for the block or 0 on hole or error 686b1e71b06SSteven Whitehouse */ 687b1e71b06SSteven Whitehouse 688b1e71b06SSteven Whitehouse static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) 689b1e71b06SSteven Whitehouse { 690b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 691b1e71b06SSteven Whitehouse struct gfs2_holder i_gh; 692b1e71b06SSteven Whitehouse sector_t dblock = 0; 693b1e71b06SSteven Whitehouse int error; 694b1e71b06SSteven Whitehouse 695b1e71b06SSteven Whitehouse error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 696b1e71b06SSteven Whitehouse if (error) 697b1e71b06SSteven Whitehouse return 0; 698b1e71b06SSteven Whitehouse 699b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 700b1e71b06SSteven Whitehouse dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); 701b1e71b06SSteven Whitehouse 702b1e71b06SSteven Whitehouse gfs2_glock_dq_uninit(&i_gh); 703b1e71b06SSteven Whitehouse 704b1e71b06SSteven Whitehouse return dblock; 705b1e71b06SSteven Whitehouse } 706b1e71b06SSteven Whitehouse 707b1e71b06SSteven Whitehouse static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) 708b1e71b06SSteven Whitehouse { 709b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 710b1e71b06SSteven Whitehouse 711b1e71b06SSteven Whitehouse lock_buffer(bh); 712b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 713b1e71b06SSteven Whitehouse clear_buffer_dirty(bh); 714b1e71b06SSteven Whitehouse bd = bh->b_private; 715b1e71b06SSteven Whitehouse if (bd) { 716c0752aa7SBob Peterson if (!list_empty(&bd->bd_list) && !buffer_pinned(bh)) 717c0752aa7SBob Peterson list_del_init(&bd->bd_list); 718b1e71b06SSteven Whitehouse else 71968cd4ce2SBob Peterson gfs2_remove_from_journal(bh, REMOVE_JDATA); 720b1e71b06SSteven Whitehouse } 721b1e71b06SSteven Whitehouse bh->b_bdev = NULL; 722b1e71b06SSteven Whitehouse clear_buffer_mapped(bh); 723b1e71b06SSteven Whitehouse clear_buffer_req(bh); 724b1e71b06SSteven Whitehouse clear_buffer_new(bh); 725b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 726b1e71b06SSteven Whitehouse unlock_buffer(bh); 727b1e71b06SSteven Whitehouse } 728b1e71b06SSteven Whitehouse 729d47992f8SLukas Czerner static void gfs2_invalidatepage(struct page *page, unsigned int offset, 730d47992f8SLukas Czerner unsigned int length) 731b1e71b06SSteven Whitehouse { 732b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 7335c0bb97cSLukas Czerner unsigned int stop = offset + length; 73409cbfeafSKirill A. Shutemov int partial_page = (offset || length < PAGE_SIZE); 735b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 736b1e71b06SSteven Whitehouse unsigned long pos = 0; 737b1e71b06SSteven Whitehouse 738b1e71b06SSteven Whitehouse BUG_ON(!PageLocked(page)); 7395c0bb97cSLukas Czerner if (!partial_page) 740b1e71b06SSteven Whitehouse ClearPageChecked(page); 741b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 742b1e71b06SSteven Whitehouse goto out; 743b1e71b06SSteven Whitehouse 744b1e71b06SSteven Whitehouse bh = head = page_buffers(page); 745b1e71b06SSteven Whitehouse do { 7465c0bb97cSLukas Czerner if (pos + bh->b_size > stop) 7475c0bb97cSLukas Czerner return; 7485c0bb97cSLukas Czerner 749b1e71b06SSteven Whitehouse if (offset <= pos) 750b1e71b06SSteven Whitehouse gfs2_discard(sdp, bh); 751b1e71b06SSteven Whitehouse pos += bh->b_size; 752b1e71b06SSteven Whitehouse bh = bh->b_this_page; 753b1e71b06SSteven Whitehouse } while (bh != head); 754b1e71b06SSteven Whitehouse out: 7555c0bb97cSLukas Czerner if (!partial_page) 756b1e71b06SSteven Whitehouse try_to_release_page(page, 0); 757b1e71b06SSteven Whitehouse } 758b1e71b06SSteven Whitehouse 759b1e71b06SSteven Whitehouse /** 760b1e71b06SSteven Whitehouse * gfs2_releasepage - free the metadata associated with a page 761b1e71b06SSteven Whitehouse * @page: the page that's being released 762b1e71b06SSteven Whitehouse * @gfp_mask: passed from Linux VFS, ignored by us 763b1e71b06SSteven Whitehouse * 7640ebbe4f9SAndreas Gruenbacher * Calls try_to_free_buffers() to free the buffers and put the page if the 7650ebbe4f9SAndreas Gruenbacher * buffers can be released. 766b1e71b06SSteven Whitehouse * 7670ebbe4f9SAndreas Gruenbacher * Returns: 1 if the page was put or else 0 768b1e71b06SSteven Whitehouse */ 769b1e71b06SSteven Whitehouse 770b1e71b06SSteven Whitehouse int gfs2_releasepage(struct page *page, gfp_t gfp_mask) 771b1e71b06SSteven Whitehouse { 772009d8518SSteven Whitehouse struct address_space *mapping = page->mapping; 773009d8518SSteven Whitehouse struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 774b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 775b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 776b1e71b06SSteven Whitehouse 777b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 778b1e71b06SSteven Whitehouse return 0; 779b1e71b06SSteven Whitehouse 7801c185c02SAndreas Gruenbacher /* 7811c185c02SAndreas Gruenbacher * From xfs_vm_releasepage: mm accommodates an old ext3 case where 7821c185c02SAndreas Gruenbacher * clean pages might not have had the dirty bit cleared. Thus, it can 7831c185c02SAndreas Gruenbacher * send actual dirty pages to ->releasepage() via shrink_active_list(). 7841c185c02SAndreas Gruenbacher * 7851c185c02SAndreas Gruenbacher * As a workaround, we skip pages that contain dirty buffers below. 7861c185c02SAndreas Gruenbacher * Once ->releasepage isn't called on dirty pages anymore, we can warn 7871c185c02SAndreas Gruenbacher * on dirty buffers like we used to here again. 7881c185c02SAndreas Gruenbacher */ 7891c185c02SAndreas Gruenbacher 790b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 791380f7c65SSteven Whitehouse spin_lock(&sdp->sd_ail_lock); 792b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 793b1e71b06SSteven Whitehouse do { 794b1e71b06SSteven Whitehouse if (atomic_read(&bh->b_count)) 795b1e71b06SSteven Whitehouse goto cannot_release; 796b1e71b06SSteven Whitehouse bd = bh->b_private; 79716ca9412SBenjamin Marzinski if (bd && bd->bd_tr) 798b1e71b06SSteven Whitehouse goto cannot_release; 7991c185c02SAndreas Gruenbacher if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh))) 8001c185c02SAndreas Gruenbacher goto cannot_release; 801b1e71b06SSteven Whitehouse bh = bh->b_this_page; 802b1e71b06SSteven Whitehouse } while(bh != head); 803380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 804b1e71b06SSteven Whitehouse 805b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 806b1e71b06SSteven Whitehouse do { 807b1e71b06SSteven Whitehouse bd = bh->b_private; 808b1e71b06SSteven Whitehouse if (bd) { 809b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, bd->bd_bh == bh); 810e4f29206SSteven Whitehouse if (!list_empty(&bd->bd_list)) 811c0752aa7SBob Peterson list_del_init(&bd->bd_list); 812b1e71b06SSteven Whitehouse bd->bd_bh = NULL; 813b1e71b06SSteven Whitehouse bh->b_private = NULL; 814b1e71b06SSteven Whitehouse kmem_cache_free(gfs2_bufdata_cachep, bd); 815e4f29206SSteven Whitehouse } 816b1e71b06SSteven Whitehouse 817b1e71b06SSteven Whitehouse bh = bh->b_this_page; 818b1e71b06SSteven Whitehouse } while (bh != head); 819e4f29206SSteven Whitehouse gfs2_log_unlock(sdp); 820b1e71b06SSteven Whitehouse 821b1e71b06SSteven Whitehouse return try_to_free_buffers(page); 8228f065d36SSteven Whitehouse 823b1e71b06SSteven Whitehouse cannot_release: 824380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 825b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 826b1e71b06SSteven Whitehouse return 0; 827b1e71b06SSteven Whitehouse } 828b1e71b06SSteven Whitehouse 829eadd7535SChristoph Hellwig static const struct address_space_operations gfs2_aops = { 8309d358143SSteven Whitehouse .writepage = gfs2_writepage, 83145138990SSteven Whitehouse .writepages = gfs2_writepages, 832b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 833b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 834b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 835b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 836b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 837967bcc91SAndreas Gruenbacher .direct_IO = noop_direct_IO, 838b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 839b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 840aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 841b1e71b06SSteven Whitehouse }; 842b1e71b06SSteven Whitehouse 843b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_jdata_aops = { 844b1e71b06SSteven Whitehouse .writepage = gfs2_jdata_writepage, 845b1e71b06SSteven Whitehouse .writepages = gfs2_jdata_writepages, 846b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 847b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 848b9e03f18SBob Peterson .set_page_dirty = jdata_set_page_dirty, 849b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 850b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 851b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 852b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 853aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 854b1e71b06SSteven Whitehouse }; 855b1e71b06SSteven Whitehouse 856b1e71b06SSteven Whitehouse void gfs2_set_aops(struct inode *inode) 857b1e71b06SSteven Whitehouse { 858eadd7535SChristoph Hellwig if (gfs2_is_jdata(GFS2_I(inode))) 859b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_jdata_aops; 860b1e71b06SSteven Whitehouse else 861eadd7535SChristoph Hellwig inode->i_mapping->a_ops = &gfs2_aops; 862b1e71b06SSteven Whitehouse } 863