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 /** 85b1e71b06SSteven Whitehouse * gfs2_writepage_common - Common bits of writepage 86b1e71b06SSteven Whitehouse * @page: The page to be written 87b1e71b06SSteven Whitehouse * @wbc: The writeback control 88b1e71b06SSteven Whitehouse * 89b1e71b06SSteven Whitehouse * Returns: 1 if writepage is ok, otherwise an error code or zero if no error. 90b1e71b06SSteven Whitehouse */ 91b1e71b06SSteven Whitehouse 92b1e71b06SSteven Whitehouse static int gfs2_writepage_common(struct page *page, 93b1e71b06SSteven Whitehouse struct writeback_control *wbc) 94b1e71b06SSteven Whitehouse { 95b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 96b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 97b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 98b1e71b06SSteven Whitehouse loff_t i_size = i_size_read(inode); 9909cbfeafSKirill A. Shutemov pgoff_t end_index = i_size >> PAGE_SHIFT; 100b1e71b06SSteven Whitehouse unsigned offset; 101b1e71b06SSteven Whitehouse 102b1e71b06SSteven Whitehouse if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 103b1e71b06SSteven Whitehouse goto out; 104b1e71b06SSteven Whitehouse if (current->journal_info) 105b1e71b06SSteven Whitehouse goto redirty; 106b1e71b06SSteven Whitehouse /* Is the page fully outside i_size? (truncate in progress) */ 10709cbfeafSKirill A. Shutemov offset = i_size & (PAGE_SIZE-1); 108b1e71b06SSteven Whitehouse if (page->index > end_index || (page->index == end_index && !offset)) { 10909cbfeafSKirill A. Shutemov page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 110b1e71b06SSteven Whitehouse goto out; 111b1e71b06SSteven Whitehouse } 112b1e71b06SSteven Whitehouse return 1; 113b1e71b06SSteven Whitehouse redirty: 114b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 115b1e71b06SSteven Whitehouse out: 116b1e71b06SSteven Whitehouse unlock_page(page); 117b1e71b06SSteven Whitehouse return 0; 118b1e71b06SSteven Whitehouse } 119b1e71b06SSteven Whitehouse 120b1e71b06SSteven Whitehouse /** 1219d358143SSteven Whitehouse * gfs2_writepage - Write page for writeback mappings 122b1e71b06SSteven Whitehouse * @page: The page 123b1e71b06SSteven Whitehouse * @wbc: The writeback control 124b1e71b06SSteven Whitehouse * 125b1e71b06SSteven Whitehouse */ 126b1e71b06SSteven Whitehouse 1279d358143SSteven Whitehouse static int gfs2_writepage(struct page *page, struct writeback_control *wbc) 128b1e71b06SSteven Whitehouse { 129b1e71b06SSteven Whitehouse int ret; 130b1e71b06SSteven Whitehouse 131b1e71b06SSteven Whitehouse ret = gfs2_writepage_common(page, wbc); 132b1e71b06SSteven Whitehouse if (ret <= 0) 133b1e71b06SSteven Whitehouse return ret; 134b1e71b06SSteven Whitehouse 13530116ff6SSteven Whitehouse return nobh_writepage(page, gfs2_get_block_noalloc, wbc); 136b1e71b06SSteven Whitehouse } 137b1e71b06SSteven Whitehouse 138fd4c5748SBenjamin Marzinski /* This is the same as calling block_write_full_page, but it also 139fd4c5748SBenjamin Marzinski * writes pages outside of i_size 140fd4c5748SBenjamin Marzinski */ 141c548a1c1SAndrew Price static int gfs2_write_full_page(struct page *page, get_block_t *get_block, 142fd4c5748SBenjamin Marzinski struct writeback_control *wbc) 143fd4c5748SBenjamin Marzinski { 144fd4c5748SBenjamin Marzinski struct inode * const inode = page->mapping->host; 145fd4c5748SBenjamin Marzinski loff_t i_size = i_size_read(inode); 146fd4c5748SBenjamin Marzinski const pgoff_t end_index = i_size >> PAGE_SHIFT; 147fd4c5748SBenjamin Marzinski unsigned offset; 148fd4c5748SBenjamin Marzinski 149fd4c5748SBenjamin Marzinski /* 150fd4c5748SBenjamin Marzinski * The page straddles i_size. It must be zeroed out on each and every 151fd4c5748SBenjamin Marzinski * writepage invocation because it may be mmapped. "A file is mapped 152fd4c5748SBenjamin Marzinski * in multiples of the page size. For a file that is not a multiple of 153fd4c5748SBenjamin Marzinski * the page size, the remaining memory is zeroed when mapped, and 154fd4c5748SBenjamin Marzinski * writes to that region are not written out to the file." 155fd4c5748SBenjamin Marzinski */ 156fd4c5748SBenjamin Marzinski offset = i_size & (PAGE_SIZE-1); 157fd4c5748SBenjamin Marzinski if (page->index == end_index && offset) 158fd4c5748SBenjamin Marzinski zero_user_segment(page, offset, PAGE_SIZE); 159fd4c5748SBenjamin Marzinski 160fd4c5748SBenjamin Marzinski return __block_write_full_page(inode, page, get_block, wbc, 161fd4c5748SBenjamin Marzinski end_buffer_async_write); 162fd4c5748SBenjamin Marzinski } 163fd4c5748SBenjamin Marzinski 164b1e71b06SSteven Whitehouse /** 165b1e71b06SSteven Whitehouse * __gfs2_jdata_writepage - The core of jdata writepage 166b1e71b06SSteven Whitehouse * @page: The page to write 167b1e71b06SSteven Whitehouse * @wbc: The writeback control 168b1e71b06SSteven Whitehouse * 169b1e71b06SSteven Whitehouse * This is shared between writepage and writepages and implements the 170b1e71b06SSteven Whitehouse * core of the writepage operation. If a transaction is required then 171b1e71b06SSteven Whitehouse * PageChecked will have been set and the transaction will have 172b1e71b06SSteven Whitehouse * already been started before this is called. 173b1e71b06SSteven Whitehouse */ 174b1e71b06SSteven Whitehouse 175b1e71b06SSteven Whitehouse static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 176b1e71b06SSteven Whitehouse { 177b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 178b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 179b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 180b1e71b06SSteven Whitehouse 181b1e71b06SSteven Whitehouse if (PageChecked(page)) { 182b1e71b06SSteven Whitehouse ClearPageChecked(page); 183b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) { 184b1e71b06SSteven Whitehouse create_empty_buffers(page, inode->i_sb->s_blocksize, 18547a9a527SFabian Frederick BIT(BH_Dirty)|BIT(BH_Uptodate)); 186b1e71b06SSteven Whitehouse } 18788b65ce5SAndreas Gruenbacher gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize); 188b1e71b06SSteven Whitehouse } 189fd4c5748SBenjamin Marzinski return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc); 190b1e71b06SSteven Whitehouse } 191b1e71b06SSteven Whitehouse 192b1e71b06SSteven Whitehouse /** 193b1e71b06SSteven Whitehouse * gfs2_jdata_writepage - Write complete page 194b1e71b06SSteven Whitehouse * @page: Page to write 1951272574bSFabian Frederick * @wbc: The writeback control 196b1e71b06SSteven Whitehouse * 197b1e71b06SSteven Whitehouse * Returns: errno 198b1e71b06SSteven Whitehouse * 199b1e71b06SSteven Whitehouse */ 200b1e71b06SSteven Whitehouse 201b1e71b06SSteven Whitehouse static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 202b1e71b06SSteven Whitehouse { 203b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 204fd4c5748SBenjamin Marzinski struct gfs2_inode *ip = GFS2_I(inode); 205b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 206b1e71b06SSteven Whitehouse int ret; 207b1e71b06SSteven Whitehouse 208fd4c5748SBenjamin Marzinski if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 209fd4c5748SBenjamin Marzinski goto out; 210fd4c5748SBenjamin Marzinski if (PageChecked(page) || current->journal_info) 211b1e71b06SSteven Whitehouse goto out_ignore; 212b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 213b1e71b06SSteven Whitehouse return ret; 214b1e71b06SSteven Whitehouse 215b1e71b06SSteven Whitehouse out_ignore: 216b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 217fd4c5748SBenjamin Marzinski out: 218b1e71b06SSteven Whitehouse unlock_page(page); 219b1e71b06SSteven Whitehouse return 0; 220b1e71b06SSteven Whitehouse } 221b1e71b06SSteven Whitehouse 222b1e71b06SSteven Whitehouse /** 22345138990SSteven Whitehouse * gfs2_writepages - Write a bunch of dirty pages back to disk 224b1e71b06SSteven Whitehouse * @mapping: The mapping to write 225b1e71b06SSteven Whitehouse * @wbc: Write-back control 226b1e71b06SSteven Whitehouse * 22745138990SSteven Whitehouse * Used for both ordered and writeback modes. 228b1e71b06SSteven Whitehouse */ 22945138990SSteven Whitehouse static int gfs2_writepages(struct address_space *mapping, 230b1e71b06SSteven Whitehouse struct writeback_control *wbc) 231b1e71b06SSteven Whitehouse { 232b066a4eeSAbhi Das struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 233b066a4eeSAbhi Das int ret = mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); 234b066a4eeSAbhi Das 235b066a4eeSAbhi Das /* 236b066a4eeSAbhi Das * Even if we didn't write any pages here, we might still be holding 237b066a4eeSAbhi Das * dirty pages in the ail. We forcibly flush the ail because we don't 238b066a4eeSAbhi Das * want balance_dirty_pages() to loop indefinitely trying to write out 239b066a4eeSAbhi Das * pages held in the ail that it can't find. 240b066a4eeSAbhi Das */ 241b066a4eeSAbhi Das if (ret == 0) 242b066a4eeSAbhi Das set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags); 243b066a4eeSAbhi Das 244b066a4eeSAbhi Das return ret; 245b1e71b06SSteven Whitehouse } 246b1e71b06SSteven Whitehouse 247b1e71b06SSteven Whitehouse /** 248b1e71b06SSteven Whitehouse * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages 249b1e71b06SSteven Whitehouse * @mapping: The mapping 250b1e71b06SSteven Whitehouse * @wbc: The writeback control 251b1e71b06SSteven Whitehouse * @pvec: The vector of pages 252b1e71b06SSteven Whitehouse * @nr_pages: The number of pages to write 2531272574bSFabian Frederick * @done_index: Page index 254b1e71b06SSteven Whitehouse * 255b1e71b06SSteven Whitehouse * Returns: non-zero if loop should terminate, zero otherwise 256b1e71b06SSteven Whitehouse */ 257b1e71b06SSteven Whitehouse 258b1e71b06SSteven Whitehouse static int gfs2_write_jdata_pagevec(struct address_space *mapping, 259b1e71b06SSteven Whitehouse struct writeback_control *wbc, 260b1e71b06SSteven Whitehouse struct pagevec *pvec, 2619aa01593SAndreas Gruenbacher int nr_pages, 262774016b2SSteven Whitehouse pgoff_t *done_index) 263b1e71b06SSteven Whitehouse { 264b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 265b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 26609cbfeafSKirill A. Shutemov unsigned nrblocks = nr_pages * (PAGE_SIZE/inode->i_sb->s_blocksize); 267b1e71b06SSteven Whitehouse int i; 268b1e71b06SSteven Whitehouse int ret; 269b1e71b06SSteven Whitehouse 270b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); 271b1e71b06SSteven Whitehouse if (ret < 0) 272b1e71b06SSteven Whitehouse return ret; 273b1e71b06SSteven Whitehouse 274b1e71b06SSteven Whitehouse for(i = 0; i < nr_pages; i++) { 275b1e71b06SSteven Whitehouse struct page *page = pvec->pages[i]; 276b1e71b06SSteven Whitehouse 277774016b2SSteven Whitehouse *done_index = page->index; 278774016b2SSteven Whitehouse 279b1e71b06SSteven Whitehouse lock_page(page); 280b1e71b06SSteven Whitehouse 281b1e71b06SSteven Whitehouse if (unlikely(page->mapping != mapping)) { 282774016b2SSteven Whitehouse continue_unlock: 283b1e71b06SSteven Whitehouse unlock_page(page); 284b1e71b06SSteven Whitehouse continue; 285b1e71b06SSteven Whitehouse } 286b1e71b06SSteven Whitehouse 287774016b2SSteven Whitehouse if (!PageDirty(page)) { 288774016b2SSteven Whitehouse /* someone wrote it for us */ 289774016b2SSteven Whitehouse goto continue_unlock; 290b1e71b06SSteven Whitehouse } 291b1e71b06SSteven Whitehouse 292774016b2SSteven Whitehouse if (PageWriteback(page)) { 293b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_NONE) 294b1e71b06SSteven Whitehouse wait_on_page_writeback(page); 295774016b2SSteven Whitehouse else 296774016b2SSteven Whitehouse goto continue_unlock; 297b1e71b06SSteven Whitehouse } 298b1e71b06SSteven Whitehouse 299774016b2SSteven Whitehouse BUG_ON(PageWriteback(page)); 300774016b2SSteven Whitehouse if (!clear_page_dirty_for_io(page)) 301774016b2SSteven Whitehouse goto continue_unlock; 302774016b2SSteven Whitehouse 303de1414a6SChristoph Hellwig trace_wbc_writepage(wbc, inode_to_bdi(inode)); 304b1e71b06SSteven Whitehouse 305b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 306774016b2SSteven Whitehouse if (unlikely(ret)) { 307774016b2SSteven Whitehouse if (ret == AOP_WRITEPAGE_ACTIVATE) { 308774016b2SSteven Whitehouse unlock_page(page); 309774016b2SSteven Whitehouse ret = 0; 310774016b2SSteven Whitehouse } else { 311b1e71b06SSteven Whitehouse 312774016b2SSteven Whitehouse /* 313774016b2SSteven Whitehouse * done_index is set past this page, 314774016b2SSteven Whitehouse * so media errors will not choke 315774016b2SSteven Whitehouse * background writeout for the entire 316774016b2SSteven Whitehouse * file. This has consequences for 317774016b2SSteven Whitehouse * range_cyclic semantics (ie. it may 318774016b2SSteven Whitehouse * not be suitable for data integrity 319774016b2SSteven Whitehouse * writeout). 320774016b2SSteven Whitehouse */ 321774016b2SSteven Whitehouse *done_index = page->index + 1; 322b1e71b06SSteven Whitehouse ret = 1; 323774016b2SSteven Whitehouse break; 324774016b2SSteven Whitehouse } 325774016b2SSteven Whitehouse } 326774016b2SSteven Whitehouse 327774016b2SSteven Whitehouse /* 328774016b2SSteven Whitehouse * We stop writing back only if we are not doing 329774016b2SSteven Whitehouse * integrity sync. In case of integrity sync we have to 330774016b2SSteven Whitehouse * keep going until we have written all the pages 331774016b2SSteven Whitehouse * we tagged for writeback prior to entering this loop. 332774016b2SSteven Whitehouse */ 333774016b2SSteven Whitehouse if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) { 334774016b2SSteven Whitehouse ret = 1; 335774016b2SSteven Whitehouse break; 336774016b2SSteven Whitehouse } 337774016b2SSteven Whitehouse 338b1e71b06SSteven Whitehouse } 339b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 340b1e71b06SSteven Whitehouse return ret; 341b1e71b06SSteven Whitehouse } 342b1e71b06SSteven Whitehouse 343b1e71b06SSteven Whitehouse /** 344b1e71b06SSteven Whitehouse * gfs2_write_cache_jdata - Like write_cache_pages but different 345b1e71b06SSteven Whitehouse * @mapping: The mapping to write 346b1e71b06SSteven Whitehouse * @wbc: The writeback control 347b1e71b06SSteven Whitehouse * 348b1e71b06SSteven Whitehouse * The reason that we use our own function here is that we need to 349b1e71b06SSteven Whitehouse * start transactions before we grab page locks. This allows us 350b1e71b06SSteven Whitehouse * to get the ordering right. 351b1e71b06SSteven Whitehouse */ 352b1e71b06SSteven Whitehouse 353b1e71b06SSteven Whitehouse static int gfs2_write_cache_jdata(struct address_space *mapping, 354b1e71b06SSteven Whitehouse struct writeback_control *wbc) 355b1e71b06SSteven Whitehouse { 356b1e71b06SSteven Whitehouse int ret = 0; 357b1e71b06SSteven Whitehouse int done = 0; 358b1e71b06SSteven Whitehouse struct pagevec pvec; 359b1e71b06SSteven Whitehouse int nr_pages; 360774016b2SSteven Whitehouse pgoff_t uninitialized_var(writeback_index); 361b1e71b06SSteven Whitehouse pgoff_t index; 362b1e71b06SSteven Whitehouse pgoff_t end; 363774016b2SSteven Whitehouse pgoff_t done_index; 364774016b2SSteven Whitehouse int cycled; 365b1e71b06SSteven Whitehouse int range_whole = 0; 36610bbd235SMatthew Wilcox xa_mark_t tag; 367b1e71b06SSteven Whitehouse 36886679820SMel Gorman pagevec_init(&pvec); 369b1e71b06SSteven Whitehouse if (wbc->range_cyclic) { 370774016b2SSteven Whitehouse writeback_index = mapping->writeback_index; /* prev offset */ 371774016b2SSteven Whitehouse index = writeback_index; 372774016b2SSteven Whitehouse if (index == 0) 373774016b2SSteven Whitehouse cycled = 1; 374774016b2SSteven Whitehouse else 375774016b2SSteven Whitehouse cycled = 0; 376b1e71b06SSteven Whitehouse end = -1; 377b1e71b06SSteven Whitehouse } else { 37809cbfeafSKirill A. Shutemov index = wbc->range_start >> PAGE_SHIFT; 37909cbfeafSKirill A. Shutemov end = wbc->range_end >> PAGE_SHIFT; 380b1e71b06SSteven Whitehouse if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 381b1e71b06SSteven Whitehouse range_whole = 1; 382774016b2SSteven Whitehouse cycled = 1; /* ignore range_cyclic tests */ 383b1e71b06SSteven Whitehouse } 384774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 385774016b2SSteven Whitehouse tag = PAGECACHE_TAG_TOWRITE; 386774016b2SSteven Whitehouse else 387774016b2SSteven Whitehouse tag = PAGECACHE_TAG_DIRTY; 388b1e71b06SSteven Whitehouse 389b1e71b06SSteven Whitehouse retry: 390774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 391774016b2SSteven Whitehouse tag_pages_for_writeback(mapping, index, end); 392774016b2SSteven Whitehouse done_index = index; 393774016b2SSteven Whitehouse while (!done && (index <= end)) { 394d2bc5b3cSJan Kara nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end, 39567fd707fSJan Kara tag); 396774016b2SSteven Whitehouse if (nr_pages == 0) 397774016b2SSteven Whitehouse break; 398774016b2SSteven Whitehouse 3999aa01593SAndreas Gruenbacher ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, &done_index); 400b1e71b06SSteven Whitehouse if (ret) 401b1e71b06SSteven Whitehouse done = 1; 402b1e71b06SSteven Whitehouse if (ret > 0) 403b1e71b06SSteven Whitehouse ret = 0; 404b1e71b06SSteven Whitehouse pagevec_release(&pvec); 405b1e71b06SSteven Whitehouse cond_resched(); 406b1e71b06SSteven Whitehouse } 407b1e71b06SSteven Whitehouse 408774016b2SSteven Whitehouse if (!cycled && !done) { 409b1e71b06SSteven Whitehouse /* 410774016b2SSteven Whitehouse * range_cyclic: 411b1e71b06SSteven Whitehouse * We hit the last page and there is more work to be done: wrap 412b1e71b06SSteven Whitehouse * back to the start of the file 413b1e71b06SSteven Whitehouse */ 414774016b2SSteven Whitehouse cycled = 1; 415b1e71b06SSteven Whitehouse index = 0; 416774016b2SSteven Whitehouse end = writeback_index - 1; 417b1e71b06SSteven Whitehouse goto retry; 418b1e71b06SSteven Whitehouse } 419b1e71b06SSteven Whitehouse 420b1e71b06SSteven Whitehouse if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 421774016b2SSteven Whitehouse mapping->writeback_index = done_index; 422774016b2SSteven Whitehouse 423b1e71b06SSteven Whitehouse return ret; 424b1e71b06SSteven Whitehouse } 425b1e71b06SSteven Whitehouse 426b1e71b06SSteven Whitehouse 427b1e71b06SSteven Whitehouse /** 428b1e71b06SSteven Whitehouse * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk 429b1e71b06SSteven Whitehouse * @mapping: The mapping to write 430b1e71b06SSteven Whitehouse * @wbc: The writeback control 431b1e71b06SSteven Whitehouse * 432b1e71b06SSteven Whitehouse */ 433b1e71b06SSteven Whitehouse 434b1e71b06SSteven Whitehouse static int gfs2_jdata_writepages(struct address_space *mapping, 435b1e71b06SSteven Whitehouse struct writeback_control *wbc) 436b1e71b06SSteven Whitehouse { 437b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 438b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 439b1e71b06SSteven Whitehouse int ret; 440b1e71b06SSteven Whitehouse 441b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 442b1e71b06SSteven Whitehouse if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { 443805c0907SBob Peterson gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | 444805c0907SBob Peterson GFS2_LFC_JDATA_WPAGES); 445b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 446b1e71b06SSteven Whitehouse } 447b1e71b06SSteven Whitehouse return ret; 448b1e71b06SSteven Whitehouse } 449b1e71b06SSteven Whitehouse 450b1e71b06SSteven Whitehouse /** 451b1e71b06SSteven Whitehouse * stuffed_readpage - Fill in a Linux page with stuffed file data 452b1e71b06SSteven Whitehouse * @ip: the inode 453b1e71b06SSteven Whitehouse * @page: the page 454b1e71b06SSteven Whitehouse * 455b1e71b06SSteven Whitehouse * Returns: errno 456b1e71b06SSteven Whitehouse */ 457b1e71b06SSteven Whitehouse 45864bc06bbSAndreas Gruenbacher int stuffed_readpage(struct gfs2_inode *ip, struct page *page) 459b1e71b06SSteven Whitehouse { 460b1e71b06SSteven Whitehouse struct buffer_head *dibh; 461602c89d2SSteven Whitehouse u64 dsize = i_size_read(&ip->i_inode); 462b1e71b06SSteven Whitehouse void *kaddr; 463b1e71b06SSteven Whitehouse int error; 464b1e71b06SSteven Whitehouse 465b1e71b06SSteven Whitehouse /* 466b1e71b06SSteven Whitehouse * Due to the order of unstuffing files and ->fault(), we can be 467b1e71b06SSteven Whitehouse * asked for a zero page in the case of a stuffed file being extended, 468b1e71b06SSteven Whitehouse * so we need to supply one here. It doesn't happen often. 469b1e71b06SSteven Whitehouse */ 470b1e71b06SSteven Whitehouse if (unlikely(page->index)) { 47109cbfeafSKirill A. Shutemov zero_user(page, 0, PAGE_SIZE); 472b1e71b06SSteven Whitehouse SetPageUptodate(page); 473b1e71b06SSteven Whitehouse return 0; 474b1e71b06SSteven Whitehouse } 475b1e71b06SSteven Whitehouse 476b1e71b06SSteven Whitehouse error = gfs2_meta_inode_buffer(ip, &dibh); 477b1e71b06SSteven Whitehouse if (error) 478b1e71b06SSteven Whitehouse return error; 479b1e71b06SSteven Whitehouse 480d9349285SCong Wang kaddr = kmap_atomic(page); 481235628c5SAndreas Gruenbacher if (dsize > gfs2_max_stuffed_size(ip)) 482235628c5SAndreas Gruenbacher dsize = gfs2_max_stuffed_size(ip); 483602c89d2SSteven Whitehouse memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); 48409cbfeafSKirill A. Shutemov memset(kaddr + dsize, 0, PAGE_SIZE - dsize); 485d9349285SCong Wang kunmap_atomic(kaddr); 486b1e71b06SSteven Whitehouse flush_dcache_page(page); 487b1e71b06SSteven Whitehouse brelse(dibh); 488b1e71b06SSteven Whitehouse SetPageUptodate(page); 489b1e71b06SSteven Whitehouse 490b1e71b06SSteven Whitehouse return 0; 491b1e71b06SSteven Whitehouse } 492b1e71b06SSteven Whitehouse 493b1e71b06SSteven Whitehouse 494b1e71b06SSteven Whitehouse /** 495b1e71b06SSteven Whitehouse * __gfs2_readpage - readpage 496b1e71b06SSteven Whitehouse * @file: The file to read a page for 497b1e71b06SSteven Whitehouse * @page: The page to read 498b1e71b06SSteven Whitehouse * 4999db115a0SAndreas Gruenbacher * This is the core of gfs2's readpage. It's used by the internal file 5009db115a0SAndreas Gruenbacher * reading code as in that case we already hold the glock. Also it's 501b1e71b06SSteven Whitehouse * called by gfs2_readpage() once the required lock has been granted. 502b1e71b06SSteven Whitehouse */ 503b1e71b06SSteven Whitehouse 504b1e71b06SSteven Whitehouse static int __gfs2_readpage(void *file, struct page *page) 505b1e71b06SSteven Whitehouse { 506b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(page->mapping->host); 507b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 508f95cbb44SAndreas Gruenbacher 509b1e71b06SSteven Whitehouse int error; 510b1e71b06SSteven Whitehouse 511f95cbb44SAndreas Gruenbacher if (i_blocksize(page->mapping->host) == PAGE_SIZE && 512f95cbb44SAndreas Gruenbacher !page_has_buffers(page)) { 513f95cbb44SAndreas Gruenbacher error = iomap_readpage(page, &gfs2_iomap_ops); 514f95cbb44SAndreas Gruenbacher } else if (gfs2_is_stuffed(ip)) { 515b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 516b1e71b06SSteven Whitehouse unlock_page(page); 517b1e71b06SSteven Whitehouse } else { 518b1e71b06SSteven Whitehouse error = mpage_readpage(page, gfs2_block_map); 519b1e71b06SSteven Whitehouse } 520b1e71b06SSteven Whitehouse 52104aea0caSBob Peterson if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags))) 522b1e71b06SSteven Whitehouse return -EIO; 523b1e71b06SSteven Whitehouse 524b1e71b06SSteven Whitehouse return error; 525b1e71b06SSteven Whitehouse } 526b1e71b06SSteven Whitehouse 527b1e71b06SSteven Whitehouse /** 528b1e71b06SSteven Whitehouse * gfs2_readpage - read a page of a file 529b1e71b06SSteven Whitehouse * @file: The file to read 530b1e71b06SSteven Whitehouse * @page: The page of the file 531b1e71b06SSteven Whitehouse * 532b1e71b06SSteven Whitehouse * This deals with the locking required. We have to unlock and 533b1e71b06SSteven Whitehouse * relock the page in order to get the locking in the right 534b1e71b06SSteven Whitehouse * order. 535b1e71b06SSteven Whitehouse */ 536b1e71b06SSteven Whitehouse 537b1e71b06SSteven Whitehouse static int gfs2_readpage(struct file *file, struct page *page) 538b1e71b06SSteven Whitehouse { 539b1e71b06SSteven Whitehouse struct address_space *mapping = page->mapping; 540b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 541b1e71b06SSteven Whitehouse struct gfs2_holder gh; 542b1e71b06SSteven Whitehouse int error; 543b1e71b06SSteven Whitehouse 544b1e71b06SSteven Whitehouse unlock_page(page); 545b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 546b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&gh); 547b1e71b06SSteven Whitehouse if (unlikely(error)) 548b1e71b06SSteven Whitehouse goto out; 549b1e71b06SSteven Whitehouse error = AOP_TRUNCATED_PAGE; 550b1e71b06SSteven Whitehouse lock_page(page); 551b1e71b06SSteven Whitehouse if (page->mapping == mapping && !PageUptodate(page)) 552b1e71b06SSteven Whitehouse error = __gfs2_readpage(file, page); 553b1e71b06SSteven Whitehouse else 554b1e71b06SSteven Whitehouse unlock_page(page); 555b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 556b1e71b06SSteven Whitehouse out: 557b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 558b1e71b06SSteven Whitehouse if (error && error != AOP_TRUNCATED_PAGE) 559b1e71b06SSteven Whitehouse lock_page(page); 560b1e71b06SSteven Whitehouse return error; 561b1e71b06SSteven Whitehouse } 562b1e71b06SSteven Whitehouse 563b1e71b06SSteven Whitehouse /** 564b1e71b06SSteven Whitehouse * gfs2_internal_read - read an internal file 565b1e71b06SSteven Whitehouse * @ip: The gfs2 inode 566b1e71b06SSteven Whitehouse * @buf: The buffer to fill 567b1e71b06SSteven Whitehouse * @pos: The file position 568b1e71b06SSteven Whitehouse * @size: The amount to read 569b1e71b06SSteven Whitehouse * 570b1e71b06SSteven Whitehouse */ 571b1e71b06SSteven Whitehouse 5724306629eSAndrew Price int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, 5734306629eSAndrew Price unsigned size) 574b1e71b06SSteven Whitehouse { 575b1e71b06SSteven Whitehouse struct address_space *mapping = ip->i_inode.i_mapping; 57609cbfeafSKirill A. Shutemov unsigned long index = *pos / PAGE_SIZE; 57709cbfeafSKirill A. Shutemov unsigned offset = *pos & (PAGE_SIZE - 1); 578b1e71b06SSteven Whitehouse unsigned copied = 0; 579b1e71b06SSteven Whitehouse unsigned amt; 580b1e71b06SSteven Whitehouse struct page *page; 581b1e71b06SSteven Whitehouse void *p; 582b1e71b06SSteven Whitehouse 583b1e71b06SSteven Whitehouse do { 584b1e71b06SSteven Whitehouse amt = size - copied; 58509cbfeafSKirill A. Shutemov if (offset + size > PAGE_SIZE) 58609cbfeafSKirill A. Shutemov amt = PAGE_SIZE - offset; 587b1e71b06SSteven Whitehouse page = read_cache_page(mapping, index, __gfs2_readpage, NULL); 588b1e71b06SSteven Whitehouse if (IS_ERR(page)) 589b1e71b06SSteven Whitehouse return PTR_ERR(page); 590d9349285SCong Wang p = kmap_atomic(page); 591b1e71b06SSteven Whitehouse memcpy(buf + copied, p + offset, amt); 592d9349285SCong Wang kunmap_atomic(p); 59309cbfeafSKirill A. Shutemov put_page(page); 594b1e71b06SSteven Whitehouse copied += amt; 595b1e71b06SSteven Whitehouse index++; 596b1e71b06SSteven Whitehouse offset = 0; 597b1e71b06SSteven Whitehouse } while(copied < size); 598b1e71b06SSteven Whitehouse (*pos) += size; 599b1e71b06SSteven Whitehouse return size; 600b1e71b06SSteven Whitehouse } 601b1e71b06SSteven Whitehouse 602b1e71b06SSteven Whitehouse /** 603b1e71b06SSteven Whitehouse * gfs2_readpages - Read a bunch of pages at once 6041272574bSFabian Frederick * @file: The file to read from 6051272574bSFabian Frederick * @mapping: Address space info 6061272574bSFabian Frederick * @pages: List of pages to read 6071272574bSFabian Frederick * @nr_pages: Number of pages to read 608b1e71b06SSteven Whitehouse * 609b1e71b06SSteven Whitehouse * Some notes: 610b1e71b06SSteven Whitehouse * 1. This is only for readahead, so we can simply ignore any things 611b1e71b06SSteven Whitehouse * which are slightly inconvenient (such as locking conflicts between 612b1e71b06SSteven Whitehouse * the page lock and the glock) and return having done no I/O. Its 613b1e71b06SSteven Whitehouse * obviously not something we'd want to do on too regular a basis. 614b1e71b06SSteven Whitehouse * Any I/O we ignore at this time will be done via readpage later. 615b1e71b06SSteven Whitehouse * 2. We don't handle stuffed files here we let readpage do the honours. 616b1e71b06SSteven Whitehouse * 3. mpage_readpages() does most of the heavy lifting in the common case. 617b1e71b06SSteven Whitehouse * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. 618b1e71b06SSteven Whitehouse */ 619b1e71b06SSteven Whitehouse 620b1e71b06SSteven Whitehouse static int gfs2_readpages(struct file *file, struct address_space *mapping, 621b1e71b06SSteven Whitehouse struct list_head *pages, unsigned nr_pages) 622b1e71b06SSteven Whitehouse { 623b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 624b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 625b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 626b1e71b06SSteven Whitehouse struct gfs2_holder gh; 627b1e71b06SSteven Whitehouse int ret; 628b1e71b06SSteven Whitehouse 629b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 630b1e71b06SSteven Whitehouse ret = gfs2_glock_nq(&gh); 631b1e71b06SSteven Whitehouse if (unlikely(ret)) 632b1e71b06SSteven Whitehouse goto out_uninit; 633b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 634b1e71b06SSteven Whitehouse ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); 635b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 636b1e71b06SSteven Whitehouse out_uninit: 637b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 63804aea0caSBob Peterson if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags))) 639b1e71b06SSteven Whitehouse ret = -EIO; 640b1e71b06SSteven Whitehouse return ret; 641b1e71b06SSteven Whitehouse } 642b1e71b06SSteven Whitehouse 643b1e71b06SSteven Whitehouse /** 644b1e71b06SSteven Whitehouse * adjust_fs_space - Adjusts the free space available due to gfs2_grow 645b1e71b06SSteven Whitehouse * @inode: the rindex inode 646b1e71b06SSteven Whitehouse */ 64764bc06bbSAndreas Gruenbacher void adjust_fs_space(struct inode *inode) 648b1e71b06SSteven Whitehouse { 649d0a22a4bSAndreas Gruenbacher struct gfs2_sbd *sdp = GFS2_SB(inode); 6501946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 6511946f70aSBenjamin Marzinski struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 652b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 653b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 6541946f70aSBenjamin Marzinski struct buffer_head *m_bh, *l_bh; 655b1e71b06SSteven Whitehouse u64 fs_total, new_free; 656b1e71b06SSteven Whitehouse 657d0a22a4bSAndreas Gruenbacher if (gfs2_trans_begin(sdp, 2 * RES_STATFS, 0) != 0) 658d0a22a4bSAndreas Gruenbacher return; 659d0a22a4bSAndreas Gruenbacher 660b1e71b06SSteven Whitehouse /* Total up the file system space, according to the latest rindex. */ 661b1e71b06SSteven Whitehouse fs_total = gfs2_ri_total(sdp); 6621946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) 663d0a22a4bSAndreas Gruenbacher goto out; 664b1e71b06SSteven Whitehouse 665b1e71b06SSteven Whitehouse spin_lock(&sdp->sd_statfs_spin); 6661946f70aSBenjamin Marzinski gfs2_statfs_change_in(m_sc, m_bh->b_data + 6671946f70aSBenjamin Marzinski sizeof(struct gfs2_dinode)); 668b1e71b06SSteven Whitehouse if (fs_total > (m_sc->sc_total + l_sc->sc_total)) 669b1e71b06SSteven Whitehouse new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); 670b1e71b06SSteven Whitehouse else 671b1e71b06SSteven Whitehouse new_free = 0; 672b1e71b06SSteven Whitehouse spin_unlock(&sdp->sd_statfs_spin); 673b1e71b06SSteven Whitehouse fs_warn(sdp, "File system extended by %llu blocks.\n", 674b1e71b06SSteven Whitehouse (unsigned long long)new_free); 675b1e71b06SSteven Whitehouse gfs2_statfs_change(sdp, new_free, new_free, 0); 6761946f70aSBenjamin Marzinski 6771946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) 678d0a22a4bSAndreas Gruenbacher goto out2; 6791946f70aSBenjamin Marzinski update_statfs(sdp, m_bh, l_bh); 6801946f70aSBenjamin Marzinski brelse(l_bh); 681d0a22a4bSAndreas Gruenbacher out2: 6821946f70aSBenjamin Marzinski brelse(m_bh); 683d0a22a4bSAndreas Gruenbacher out: 684d0a22a4bSAndreas Gruenbacher sdp->sd_rindex_uptodate = 0; 685d0a22a4bSAndreas Gruenbacher gfs2_trans_end(sdp); 686b1e71b06SSteven Whitehouse } 687b1e71b06SSteven Whitehouse 688b1e71b06SSteven Whitehouse /** 689b9e03f18SBob Peterson * jdata_set_page_dirty - Page dirtying function 690b1e71b06SSteven Whitehouse * @page: The page to dirty 691b1e71b06SSteven Whitehouse * 692b1e71b06SSteven Whitehouse * Returns: 1 if it dirtyed the page, or 0 otherwise 693b1e71b06SSteven Whitehouse */ 694b1e71b06SSteven Whitehouse 695b9e03f18SBob Peterson static int jdata_set_page_dirty(struct page *page) 696b1e71b06SSteven Whitehouse { 697b1e71b06SSteven Whitehouse SetPageChecked(page); 698b1e71b06SSteven Whitehouse return __set_page_dirty_buffers(page); 699b1e71b06SSteven Whitehouse } 700b1e71b06SSteven Whitehouse 701b1e71b06SSteven Whitehouse /** 702b1e71b06SSteven Whitehouse * gfs2_bmap - Block map function 703b1e71b06SSteven Whitehouse * @mapping: Address space info 704b1e71b06SSteven Whitehouse * @lblock: The block to map 705b1e71b06SSteven Whitehouse * 706b1e71b06SSteven Whitehouse * Returns: The disk address for the block or 0 on hole or error 707b1e71b06SSteven Whitehouse */ 708b1e71b06SSteven Whitehouse 709b1e71b06SSteven Whitehouse static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) 710b1e71b06SSteven Whitehouse { 711b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 712b1e71b06SSteven Whitehouse struct gfs2_holder i_gh; 713b1e71b06SSteven Whitehouse sector_t dblock = 0; 714b1e71b06SSteven Whitehouse int error; 715b1e71b06SSteven Whitehouse 716b1e71b06SSteven Whitehouse error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 717b1e71b06SSteven Whitehouse if (error) 718b1e71b06SSteven Whitehouse return 0; 719b1e71b06SSteven Whitehouse 720b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 721b1e71b06SSteven Whitehouse dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); 722b1e71b06SSteven Whitehouse 723b1e71b06SSteven Whitehouse gfs2_glock_dq_uninit(&i_gh); 724b1e71b06SSteven Whitehouse 725b1e71b06SSteven Whitehouse return dblock; 726b1e71b06SSteven Whitehouse } 727b1e71b06SSteven Whitehouse 728b1e71b06SSteven Whitehouse static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) 729b1e71b06SSteven Whitehouse { 730b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 731b1e71b06SSteven Whitehouse 732b1e71b06SSteven Whitehouse lock_buffer(bh); 733b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 734b1e71b06SSteven Whitehouse clear_buffer_dirty(bh); 735b1e71b06SSteven Whitehouse bd = bh->b_private; 736b1e71b06SSteven Whitehouse if (bd) { 737c0752aa7SBob Peterson if (!list_empty(&bd->bd_list) && !buffer_pinned(bh)) 738c0752aa7SBob Peterson list_del_init(&bd->bd_list); 739b1e71b06SSteven Whitehouse else 74068cd4ce2SBob Peterson gfs2_remove_from_journal(bh, REMOVE_JDATA); 741b1e71b06SSteven Whitehouse } 742b1e71b06SSteven Whitehouse bh->b_bdev = NULL; 743b1e71b06SSteven Whitehouse clear_buffer_mapped(bh); 744b1e71b06SSteven Whitehouse clear_buffer_req(bh); 745b1e71b06SSteven Whitehouse clear_buffer_new(bh); 746b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 747b1e71b06SSteven Whitehouse unlock_buffer(bh); 748b1e71b06SSteven Whitehouse } 749b1e71b06SSteven Whitehouse 750d47992f8SLukas Czerner static void gfs2_invalidatepage(struct page *page, unsigned int offset, 751d47992f8SLukas Czerner unsigned int length) 752b1e71b06SSteven Whitehouse { 753b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 7545c0bb97cSLukas Czerner unsigned int stop = offset + length; 75509cbfeafSKirill A. Shutemov int partial_page = (offset || length < PAGE_SIZE); 756b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 757b1e71b06SSteven Whitehouse unsigned long pos = 0; 758b1e71b06SSteven Whitehouse 759b1e71b06SSteven Whitehouse BUG_ON(!PageLocked(page)); 7605c0bb97cSLukas Czerner if (!partial_page) 761b1e71b06SSteven Whitehouse ClearPageChecked(page); 762b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 763b1e71b06SSteven Whitehouse goto out; 764b1e71b06SSteven Whitehouse 765b1e71b06SSteven Whitehouse bh = head = page_buffers(page); 766b1e71b06SSteven Whitehouse do { 7675c0bb97cSLukas Czerner if (pos + bh->b_size > stop) 7685c0bb97cSLukas Czerner return; 7695c0bb97cSLukas Czerner 770b1e71b06SSteven Whitehouse if (offset <= pos) 771b1e71b06SSteven Whitehouse gfs2_discard(sdp, bh); 772b1e71b06SSteven Whitehouse pos += bh->b_size; 773b1e71b06SSteven Whitehouse bh = bh->b_this_page; 774b1e71b06SSteven Whitehouse } while (bh != head); 775b1e71b06SSteven Whitehouse out: 7765c0bb97cSLukas Czerner if (!partial_page) 777b1e71b06SSteven Whitehouse try_to_release_page(page, 0); 778b1e71b06SSteven Whitehouse } 779b1e71b06SSteven Whitehouse 780b1e71b06SSteven Whitehouse /** 781b1e71b06SSteven Whitehouse * gfs2_releasepage - free the metadata associated with a page 782b1e71b06SSteven Whitehouse * @page: the page that's being released 783b1e71b06SSteven Whitehouse * @gfp_mask: passed from Linux VFS, ignored by us 784b1e71b06SSteven Whitehouse * 7850ebbe4f9SAndreas Gruenbacher * Calls try_to_free_buffers() to free the buffers and put the page if the 7860ebbe4f9SAndreas Gruenbacher * buffers can be released. 787b1e71b06SSteven Whitehouse * 7880ebbe4f9SAndreas Gruenbacher * Returns: 1 if the page was put or else 0 789b1e71b06SSteven Whitehouse */ 790b1e71b06SSteven Whitehouse 791b1e71b06SSteven Whitehouse int gfs2_releasepage(struct page *page, gfp_t gfp_mask) 792b1e71b06SSteven Whitehouse { 793009d8518SSteven Whitehouse struct address_space *mapping = page->mapping; 794009d8518SSteven Whitehouse struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 795b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 796b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 797b1e71b06SSteven Whitehouse 798b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 799b1e71b06SSteven Whitehouse return 0; 800b1e71b06SSteven Whitehouse 8011c185c02SAndreas Gruenbacher /* 8021c185c02SAndreas Gruenbacher * From xfs_vm_releasepage: mm accommodates an old ext3 case where 8031c185c02SAndreas Gruenbacher * clean pages might not have had the dirty bit cleared. Thus, it can 8041c185c02SAndreas Gruenbacher * send actual dirty pages to ->releasepage() via shrink_active_list(). 8051c185c02SAndreas Gruenbacher * 8061c185c02SAndreas Gruenbacher * As a workaround, we skip pages that contain dirty buffers below. 8071c185c02SAndreas Gruenbacher * Once ->releasepage isn't called on dirty pages anymore, we can warn 8081c185c02SAndreas Gruenbacher * on dirty buffers like we used to here again. 8091c185c02SAndreas Gruenbacher */ 8101c185c02SAndreas Gruenbacher 811b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 812380f7c65SSteven Whitehouse spin_lock(&sdp->sd_ail_lock); 813b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 814b1e71b06SSteven Whitehouse do { 815b1e71b06SSteven Whitehouse if (atomic_read(&bh->b_count)) 816b1e71b06SSteven Whitehouse goto cannot_release; 817b1e71b06SSteven Whitehouse bd = bh->b_private; 81816ca9412SBenjamin Marzinski if (bd && bd->bd_tr) 819b1e71b06SSteven Whitehouse goto cannot_release; 8201c185c02SAndreas Gruenbacher if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh))) 8211c185c02SAndreas Gruenbacher goto cannot_release; 822b1e71b06SSteven Whitehouse bh = bh->b_this_page; 823b1e71b06SSteven Whitehouse } while(bh != head); 824380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 825b1e71b06SSteven Whitehouse 826b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 827b1e71b06SSteven Whitehouse do { 828b1e71b06SSteven Whitehouse bd = bh->b_private; 829b1e71b06SSteven Whitehouse if (bd) { 830b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, bd->bd_bh == bh); 831e4f29206SSteven Whitehouse if (!list_empty(&bd->bd_list)) 832c0752aa7SBob Peterson list_del_init(&bd->bd_list); 833b1e71b06SSteven Whitehouse bd->bd_bh = NULL; 834b1e71b06SSteven Whitehouse bh->b_private = NULL; 835b1e71b06SSteven Whitehouse kmem_cache_free(gfs2_bufdata_cachep, bd); 836e4f29206SSteven Whitehouse } 837b1e71b06SSteven Whitehouse 838b1e71b06SSteven Whitehouse bh = bh->b_this_page; 839b1e71b06SSteven Whitehouse } while (bh != head); 840e4f29206SSteven Whitehouse gfs2_log_unlock(sdp); 841b1e71b06SSteven Whitehouse 842b1e71b06SSteven Whitehouse return try_to_free_buffers(page); 8438f065d36SSteven Whitehouse 844b1e71b06SSteven Whitehouse cannot_release: 845380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 846b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 847b1e71b06SSteven Whitehouse return 0; 848b1e71b06SSteven Whitehouse } 849b1e71b06SSteven Whitehouse 850eadd7535SChristoph Hellwig static const struct address_space_operations gfs2_aops = { 8519d358143SSteven Whitehouse .writepage = gfs2_writepage, 85245138990SSteven Whitehouse .writepages = gfs2_writepages, 853b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 854b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 855b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 856b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 857b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 858967bcc91SAndreas Gruenbacher .direct_IO = noop_direct_IO, 859b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 860b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 861aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 862b1e71b06SSteven Whitehouse }; 863b1e71b06SSteven Whitehouse 864b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_jdata_aops = { 865b1e71b06SSteven Whitehouse .writepage = gfs2_jdata_writepage, 866b1e71b06SSteven Whitehouse .writepages = gfs2_jdata_writepages, 867b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 868b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 869b9e03f18SBob Peterson .set_page_dirty = jdata_set_page_dirty, 870b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 871b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 872b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 873b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 874aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 875b1e71b06SSteven Whitehouse }; 876b1e71b06SSteven Whitehouse 877b1e71b06SSteven Whitehouse void gfs2_set_aops(struct inode *inode) 878b1e71b06SSteven Whitehouse { 879eadd7535SChristoph Hellwig if (gfs2_is_jdata(GFS2_I(inode))) 880b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_jdata_aops; 881b1e71b06SSteven Whitehouse else 882eadd7535SChristoph Hellwig inode->i_mapping->a_ops = &gfs2_aops; 883b1e71b06SSteven Whitehouse } 884