1b1e71b06SSteven Whitehouse /* 2b1e71b06SSteven Whitehouse * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3b1e71b06SSteven Whitehouse * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. 4b1e71b06SSteven Whitehouse * 5b1e71b06SSteven Whitehouse * This copyrighted material is made available to anyone wishing to use, 6b1e71b06SSteven Whitehouse * modify, copy, or redistribute it subject to the terms and conditions 7b1e71b06SSteven Whitehouse * of the GNU General Public License version 2. 8b1e71b06SSteven Whitehouse */ 9b1e71b06SSteven Whitehouse 10b1e71b06SSteven Whitehouse #include <linux/sched.h> 11b1e71b06SSteven Whitehouse #include <linux/slab.h> 12b1e71b06SSteven Whitehouse #include <linux/spinlock.h> 13b1e71b06SSteven Whitehouse #include <linux/completion.h> 14b1e71b06SSteven Whitehouse #include <linux/buffer_head.h> 15b1e71b06SSteven Whitehouse #include <linux/pagemap.h> 16b1e71b06SSteven Whitehouse #include <linux/pagevec.h> 17b1e71b06SSteven Whitehouse #include <linux/mpage.h> 18b1e71b06SSteven Whitehouse #include <linux/fs.h> 19b1e71b06SSteven Whitehouse #include <linux/writeback.h> 20b1e71b06SSteven Whitehouse #include <linux/swap.h> 21b1e71b06SSteven Whitehouse #include <linux/gfs2_ondisk.h> 22b1e71b06SSteven Whitehouse #include <linux/backing-dev.h> 23a27bb332SKent Overstreet #include <linux/aio.h> 24774016b2SSteven Whitehouse #include <trace/events/writeback.h> 25b1e71b06SSteven Whitehouse 26b1e71b06SSteven Whitehouse #include "gfs2.h" 27b1e71b06SSteven Whitehouse #include "incore.h" 28b1e71b06SSteven Whitehouse #include "bmap.h" 29b1e71b06SSteven Whitehouse #include "glock.h" 30b1e71b06SSteven Whitehouse #include "inode.h" 31b1e71b06SSteven Whitehouse #include "log.h" 32b1e71b06SSteven Whitehouse #include "meta_io.h" 33b1e71b06SSteven Whitehouse #include "quota.h" 34b1e71b06SSteven Whitehouse #include "trans.h" 35b1e71b06SSteven Whitehouse #include "rgrp.h" 36b1e71b06SSteven Whitehouse #include "super.h" 37b1e71b06SSteven Whitehouse #include "util.h" 38b1e71b06SSteven Whitehouse #include "glops.h" 39b1e71b06SSteven Whitehouse 40b1e71b06SSteven Whitehouse 41b120193eSBob Peterson static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, 42b1e71b06SSteven Whitehouse unsigned int from, unsigned int to) 43b1e71b06SSteven Whitehouse { 44b1e71b06SSteven Whitehouse struct buffer_head *head = page_buffers(page); 45b1e71b06SSteven Whitehouse unsigned int bsize = head->b_size; 46b1e71b06SSteven Whitehouse struct buffer_head *bh; 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; 52b1e71b06SSteven Whitehouse if (end <= from || start >= to) 53b1e71b06SSteven Whitehouse continue; 54b1e71b06SSteven Whitehouse if (gfs2_is_jdata(ip)) 55b1e71b06SSteven Whitehouse set_buffer_uptodate(bh); 56350a9b0aSSteven Whitehouse gfs2_trans_add_data(ip->i_gl, bh); 57b1e71b06SSteven Whitehouse } 58b1e71b06SSteven Whitehouse } 59b1e71b06SSteven Whitehouse 60b1e71b06SSteven Whitehouse /** 61b1e71b06SSteven Whitehouse * gfs2_get_block_noalloc - Fills in a buffer head with details about a block 62b1e71b06SSteven Whitehouse * @inode: The inode 63b1e71b06SSteven Whitehouse * @lblock: The block number to look up 64b1e71b06SSteven Whitehouse * @bh_result: The buffer head to return the result in 65b1e71b06SSteven Whitehouse * @create: Non-zero if we may add block to the file 66b1e71b06SSteven Whitehouse * 67b1e71b06SSteven Whitehouse * Returns: errno 68b1e71b06SSteven Whitehouse */ 69b1e71b06SSteven Whitehouse 70b1e71b06SSteven Whitehouse static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, 71b1e71b06SSteven Whitehouse struct buffer_head *bh_result, int create) 72b1e71b06SSteven Whitehouse { 73b1e71b06SSteven Whitehouse int error; 74b1e71b06SSteven Whitehouse 75b1e71b06SSteven Whitehouse error = gfs2_block_map(inode, lblock, bh_result, 0); 76b1e71b06SSteven Whitehouse if (error) 77b1e71b06SSteven Whitehouse return error; 78b1e71b06SSteven Whitehouse if (!buffer_mapped(bh_result)) 79b1e71b06SSteven Whitehouse return -EIO; 80b1e71b06SSteven Whitehouse return 0; 81b1e71b06SSteven Whitehouse } 82b1e71b06SSteven Whitehouse 83b1e71b06SSteven Whitehouse static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, 84b1e71b06SSteven Whitehouse struct buffer_head *bh_result, int create) 85b1e71b06SSteven Whitehouse { 86b1e71b06SSteven Whitehouse return gfs2_block_map(inode, lblock, bh_result, 0); 87b1e71b06SSteven Whitehouse } 88b1e71b06SSteven Whitehouse 89b1e71b06SSteven Whitehouse /** 90b1e71b06SSteven Whitehouse * gfs2_writepage_common - Common bits of writepage 91b1e71b06SSteven Whitehouse * @page: The page to be written 92b1e71b06SSteven Whitehouse * @wbc: The writeback control 93b1e71b06SSteven Whitehouse * 94b1e71b06SSteven Whitehouse * Returns: 1 if writepage is ok, otherwise an error code or zero if no error. 95b1e71b06SSteven Whitehouse */ 96b1e71b06SSteven Whitehouse 97b1e71b06SSteven Whitehouse static int gfs2_writepage_common(struct page *page, 98b1e71b06SSteven Whitehouse struct writeback_control *wbc) 99b1e71b06SSteven Whitehouse { 100b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 101b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 102b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 103b1e71b06SSteven Whitehouse loff_t i_size = i_size_read(inode); 104b1e71b06SSteven Whitehouse pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; 105b1e71b06SSteven Whitehouse unsigned offset; 106b1e71b06SSteven Whitehouse 107b1e71b06SSteven Whitehouse if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 108b1e71b06SSteven Whitehouse goto out; 109b1e71b06SSteven Whitehouse if (current->journal_info) 110b1e71b06SSteven Whitehouse goto redirty; 111b1e71b06SSteven Whitehouse /* Is the page fully outside i_size? (truncate in progress) */ 112b1e71b06SSteven Whitehouse offset = i_size & (PAGE_CACHE_SIZE-1); 113b1e71b06SSteven Whitehouse if (page->index > end_index || (page->index == end_index && !offset)) { 114d47992f8SLukas Czerner page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE); 115b1e71b06SSteven Whitehouse goto out; 116b1e71b06SSteven Whitehouse } 117b1e71b06SSteven Whitehouse return 1; 118b1e71b06SSteven Whitehouse redirty: 119b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 120b1e71b06SSteven Whitehouse out: 121b1e71b06SSteven Whitehouse unlock_page(page); 122b1e71b06SSteven Whitehouse return 0; 123b1e71b06SSteven Whitehouse } 124b1e71b06SSteven Whitehouse 125b1e71b06SSteven Whitehouse /** 1269d358143SSteven Whitehouse * gfs2_writepage - Write page for writeback mappings 127b1e71b06SSteven Whitehouse * @page: The page 128b1e71b06SSteven Whitehouse * @wbc: The writeback control 129b1e71b06SSteven Whitehouse * 130b1e71b06SSteven Whitehouse */ 131b1e71b06SSteven Whitehouse 1329d358143SSteven Whitehouse static int gfs2_writepage(struct page *page, struct writeback_control *wbc) 133b1e71b06SSteven Whitehouse { 134b1e71b06SSteven Whitehouse int ret; 135b1e71b06SSteven Whitehouse 136b1e71b06SSteven Whitehouse ret = gfs2_writepage_common(page, wbc); 137b1e71b06SSteven Whitehouse if (ret <= 0) 138b1e71b06SSteven Whitehouse return ret; 139b1e71b06SSteven Whitehouse 14030116ff6SSteven Whitehouse return nobh_writepage(page, gfs2_get_block_noalloc, wbc); 141b1e71b06SSteven Whitehouse } 142b1e71b06SSteven Whitehouse 143b1e71b06SSteven Whitehouse /** 144b1e71b06SSteven Whitehouse * __gfs2_jdata_writepage - The core of jdata writepage 145b1e71b06SSteven Whitehouse * @page: The page to write 146b1e71b06SSteven Whitehouse * @wbc: The writeback control 147b1e71b06SSteven Whitehouse * 148b1e71b06SSteven Whitehouse * This is shared between writepage and writepages and implements the 149b1e71b06SSteven Whitehouse * core of the writepage operation. If a transaction is required then 150b1e71b06SSteven Whitehouse * PageChecked will have been set and the transaction will have 151b1e71b06SSteven Whitehouse * already been started before this is called. 152b1e71b06SSteven Whitehouse */ 153b1e71b06SSteven Whitehouse 154b1e71b06SSteven Whitehouse static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 155b1e71b06SSteven Whitehouse { 156b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 157b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 158b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 159b1e71b06SSteven Whitehouse 160b1e71b06SSteven Whitehouse if (PageChecked(page)) { 161b1e71b06SSteven Whitehouse ClearPageChecked(page); 162b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) { 163b1e71b06SSteven Whitehouse create_empty_buffers(page, inode->i_sb->s_blocksize, 164b1e71b06SSteven Whitehouse (1 << BH_Dirty)|(1 << BH_Uptodate)); 165b1e71b06SSteven Whitehouse } 166b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); 167b1e71b06SSteven Whitehouse } 168b1e71b06SSteven Whitehouse return block_write_full_page(page, gfs2_get_block_noalloc, wbc); 169b1e71b06SSteven Whitehouse } 170b1e71b06SSteven Whitehouse 171b1e71b06SSteven Whitehouse /** 172b1e71b06SSteven Whitehouse * gfs2_jdata_writepage - Write complete page 173b1e71b06SSteven Whitehouse * @page: Page to write 174b1e71b06SSteven Whitehouse * 175b1e71b06SSteven Whitehouse * Returns: errno 176b1e71b06SSteven Whitehouse * 177b1e71b06SSteven Whitehouse */ 178b1e71b06SSteven Whitehouse 179b1e71b06SSteven Whitehouse static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 180b1e71b06SSteven Whitehouse { 181b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 182b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 183b1e71b06SSteven Whitehouse int ret; 184b1e71b06SSteven Whitehouse int done_trans = 0; 185b1e71b06SSteven Whitehouse 186b1e71b06SSteven Whitehouse if (PageChecked(page)) { 187b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_ALL) 188b1e71b06SSteven Whitehouse goto out_ignore; 189b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); 190b1e71b06SSteven Whitehouse if (ret) 191b1e71b06SSteven Whitehouse goto out_ignore; 192b1e71b06SSteven Whitehouse done_trans = 1; 193b1e71b06SSteven Whitehouse } 194b1e71b06SSteven Whitehouse ret = gfs2_writepage_common(page, wbc); 195b1e71b06SSteven Whitehouse if (ret > 0) 196b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 197b1e71b06SSteven Whitehouse if (done_trans) 198b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 199b1e71b06SSteven Whitehouse return ret; 200b1e71b06SSteven Whitehouse 201b1e71b06SSteven Whitehouse out_ignore: 202b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 203b1e71b06SSteven Whitehouse unlock_page(page); 204b1e71b06SSteven Whitehouse return 0; 205b1e71b06SSteven Whitehouse } 206b1e71b06SSteven Whitehouse 207b1e71b06SSteven Whitehouse /** 20845138990SSteven Whitehouse * gfs2_writepages - Write a bunch of dirty pages back to disk 209b1e71b06SSteven Whitehouse * @mapping: The mapping to write 210b1e71b06SSteven Whitehouse * @wbc: Write-back control 211b1e71b06SSteven Whitehouse * 21245138990SSteven Whitehouse * Used for both ordered and writeback modes. 213b1e71b06SSteven Whitehouse */ 21445138990SSteven Whitehouse static int gfs2_writepages(struct address_space *mapping, 215b1e71b06SSteven Whitehouse struct writeback_control *wbc) 216b1e71b06SSteven Whitehouse { 217b1e71b06SSteven Whitehouse return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); 218b1e71b06SSteven Whitehouse } 219b1e71b06SSteven Whitehouse 220b1e71b06SSteven Whitehouse /** 221b1e71b06SSteven Whitehouse * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages 222b1e71b06SSteven Whitehouse * @mapping: The mapping 223b1e71b06SSteven Whitehouse * @wbc: The writeback control 224b1e71b06SSteven Whitehouse * @writepage: The writepage function to call for each page 225b1e71b06SSteven Whitehouse * @pvec: The vector of pages 226b1e71b06SSteven Whitehouse * @nr_pages: The number of pages to write 227b1e71b06SSteven Whitehouse * 228b1e71b06SSteven Whitehouse * Returns: non-zero if loop should terminate, zero otherwise 229b1e71b06SSteven Whitehouse */ 230b1e71b06SSteven Whitehouse 231b1e71b06SSteven Whitehouse static int gfs2_write_jdata_pagevec(struct address_space *mapping, 232b1e71b06SSteven Whitehouse struct writeback_control *wbc, 233b1e71b06SSteven Whitehouse struct pagevec *pvec, 234774016b2SSteven Whitehouse int nr_pages, pgoff_t end, 235774016b2SSteven Whitehouse pgoff_t *done_index) 236b1e71b06SSteven Whitehouse { 237b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 238b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 239b1e71b06SSteven Whitehouse unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize); 240b1e71b06SSteven Whitehouse int i; 241b1e71b06SSteven Whitehouse int ret; 242b1e71b06SSteven Whitehouse 243b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); 244b1e71b06SSteven Whitehouse if (ret < 0) 245b1e71b06SSteven Whitehouse return ret; 246b1e71b06SSteven Whitehouse 247b1e71b06SSteven Whitehouse for(i = 0; i < nr_pages; i++) { 248b1e71b06SSteven Whitehouse struct page *page = pvec->pages[i]; 249b1e71b06SSteven Whitehouse 250774016b2SSteven Whitehouse /* 251774016b2SSteven Whitehouse * At this point, the page may be truncated or 252774016b2SSteven Whitehouse * invalidated (changing page->mapping to NULL), or 253774016b2SSteven Whitehouse * even swizzled back from swapper_space to tmpfs file 254774016b2SSteven Whitehouse * mapping. However, page->index will not change 255774016b2SSteven Whitehouse * because we have a reference on the page. 256774016b2SSteven Whitehouse */ 257774016b2SSteven Whitehouse if (page->index > end) { 258774016b2SSteven Whitehouse /* 259774016b2SSteven Whitehouse * can't be range_cyclic (1st pass) because 260774016b2SSteven Whitehouse * end == -1 in that case. 261774016b2SSteven Whitehouse */ 262774016b2SSteven Whitehouse ret = 1; 263774016b2SSteven Whitehouse break; 264774016b2SSteven Whitehouse } 265774016b2SSteven Whitehouse 266774016b2SSteven Whitehouse *done_index = page->index; 267774016b2SSteven Whitehouse 268b1e71b06SSteven Whitehouse lock_page(page); 269b1e71b06SSteven Whitehouse 270b1e71b06SSteven Whitehouse if (unlikely(page->mapping != mapping)) { 271774016b2SSteven Whitehouse continue_unlock: 272b1e71b06SSteven Whitehouse unlock_page(page); 273b1e71b06SSteven Whitehouse continue; 274b1e71b06SSteven Whitehouse } 275b1e71b06SSteven Whitehouse 276774016b2SSteven Whitehouse if (!PageDirty(page)) { 277774016b2SSteven Whitehouse /* someone wrote it for us */ 278774016b2SSteven Whitehouse goto continue_unlock; 279b1e71b06SSteven Whitehouse } 280b1e71b06SSteven Whitehouse 281774016b2SSteven Whitehouse if (PageWriteback(page)) { 282b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_NONE) 283b1e71b06SSteven Whitehouse wait_on_page_writeback(page); 284774016b2SSteven Whitehouse else 285774016b2SSteven Whitehouse goto continue_unlock; 286b1e71b06SSteven Whitehouse } 287b1e71b06SSteven Whitehouse 288774016b2SSteven Whitehouse BUG_ON(PageWriteback(page)); 289774016b2SSteven Whitehouse if (!clear_page_dirty_for_io(page)) 290774016b2SSteven Whitehouse goto continue_unlock; 291774016b2SSteven Whitehouse 292774016b2SSteven Whitehouse trace_wbc_writepage(wbc, mapping->backing_dev_info); 293b1e71b06SSteven Whitehouse 294b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 295774016b2SSteven Whitehouse if (unlikely(ret)) { 296774016b2SSteven Whitehouse if (ret == AOP_WRITEPAGE_ACTIVATE) { 297774016b2SSteven Whitehouse unlock_page(page); 298774016b2SSteven Whitehouse ret = 0; 299774016b2SSteven Whitehouse } else { 300b1e71b06SSteven Whitehouse 301774016b2SSteven Whitehouse /* 302774016b2SSteven Whitehouse * done_index is set past this page, 303774016b2SSteven Whitehouse * so media errors will not choke 304774016b2SSteven Whitehouse * background writeout for the entire 305774016b2SSteven Whitehouse * file. This has consequences for 306774016b2SSteven Whitehouse * range_cyclic semantics (ie. it may 307774016b2SSteven Whitehouse * not be suitable for data integrity 308774016b2SSteven Whitehouse * writeout). 309774016b2SSteven Whitehouse */ 310774016b2SSteven Whitehouse *done_index = page->index + 1; 311b1e71b06SSteven Whitehouse ret = 1; 312774016b2SSteven Whitehouse break; 313774016b2SSteven Whitehouse } 314774016b2SSteven Whitehouse } 315774016b2SSteven Whitehouse 316774016b2SSteven Whitehouse /* 317774016b2SSteven Whitehouse * We stop writing back only if we are not doing 318774016b2SSteven Whitehouse * integrity sync. In case of integrity sync we have to 319774016b2SSteven Whitehouse * keep going until we have written all the pages 320774016b2SSteven Whitehouse * we tagged for writeback prior to entering this loop. 321774016b2SSteven Whitehouse */ 322774016b2SSteven Whitehouse if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) { 323774016b2SSteven Whitehouse ret = 1; 324774016b2SSteven Whitehouse break; 325774016b2SSteven Whitehouse } 326774016b2SSteven Whitehouse 327b1e71b06SSteven Whitehouse } 328b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 329b1e71b06SSteven Whitehouse return ret; 330b1e71b06SSteven Whitehouse } 331b1e71b06SSteven Whitehouse 332b1e71b06SSteven Whitehouse /** 333b1e71b06SSteven Whitehouse * gfs2_write_cache_jdata - Like write_cache_pages but different 334b1e71b06SSteven Whitehouse * @mapping: The mapping to write 335b1e71b06SSteven Whitehouse * @wbc: The writeback control 336b1e71b06SSteven Whitehouse * @writepage: The writepage function to call 337b1e71b06SSteven Whitehouse * @data: The data to pass to writepage 338b1e71b06SSteven Whitehouse * 339b1e71b06SSteven Whitehouse * The reason that we use our own function here is that we need to 340b1e71b06SSteven Whitehouse * start transactions before we grab page locks. This allows us 341b1e71b06SSteven Whitehouse * to get the ordering right. 342b1e71b06SSteven Whitehouse */ 343b1e71b06SSteven Whitehouse 344b1e71b06SSteven Whitehouse static int gfs2_write_cache_jdata(struct address_space *mapping, 345b1e71b06SSteven Whitehouse struct writeback_control *wbc) 346b1e71b06SSteven Whitehouse { 347b1e71b06SSteven Whitehouse int ret = 0; 348b1e71b06SSteven Whitehouse int done = 0; 349b1e71b06SSteven Whitehouse struct pagevec pvec; 350b1e71b06SSteven Whitehouse int nr_pages; 351774016b2SSteven Whitehouse pgoff_t uninitialized_var(writeback_index); 352b1e71b06SSteven Whitehouse pgoff_t index; 353b1e71b06SSteven Whitehouse pgoff_t end; 354774016b2SSteven Whitehouse pgoff_t done_index; 355774016b2SSteven Whitehouse int cycled; 356b1e71b06SSteven Whitehouse int range_whole = 0; 357774016b2SSteven Whitehouse int tag; 358b1e71b06SSteven Whitehouse 359b1e71b06SSteven Whitehouse pagevec_init(&pvec, 0); 360b1e71b06SSteven Whitehouse if (wbc->range_cyclic) { 361774016b2SSteven Whitehouse writeback_index = mapping->writeback_index; /* prev offset */ 362774016b2SSteven Whitehouse index = writeback_index; 363774016b2SSteven Whitehouse if (index == 0) 364774016b2SSteven Whitehouse cycled = 1; 365774016b2SSteven Whitehouse else 366774016b2SSteven Whitehouse cycled = 0; 367b1e71b06SSteven Whitehouse end = -1; 368b1e71b06SSteven Whitehouse } else { 369b1e71b06SSteven Whitehouse index = wbc->range_start >> PAGE_CACHE_SHIFT; 370b1e71b06SSteven Whitehouse end = wbc->range_end >> PAGE_CACHE_SHIFT; 371b1e71b06SSteven Whitehouse if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 372b1e71b06SSteven Whitehouse range_whole = 1; 373774016b2SSteven Whitehouse cycled = 1; /* ignore range_cyclic tests */ 374b1e71b06SSteven Whitehouse } 375774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 376774016b2SSteven Whitehouse tag = PAGECACHE_TAG_TOWRITE; 377774016b2SSteven Whitehouse else 378774016b2SSteven Whitehouse tag = PAGECACHE_TAG_DIRTY; 379b1e71b06SSteven Whitehouse 380b1e71b06SSteven Whitehouse retry: 381774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 382774016b2SSteven Whitehouse tag_pages_for_writeback(mapping, index, end); 383774016b2SSteven Whitehouse done_index = index; 384774016b2SSteven Whitehouse while (!done && (index <= end)) { 385774016b2SSteven Whitehouse nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, 386774016b2SSteven Whitehouse min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1); 387774016b2SSteven Whitehouse if (nr_pages == 0) 388774016b2SSteven Whitehouse break; 389774016b2SSteven Whitehouse 390774016b2SSteven Whitehouse ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end, &done_index); 391b1e71b06SSteven Whitehouse if (ret) 392b1e71b06SSteven Whitehouse done = 1; 393b1e71b06SSteven Whitehouse if (ret > 0) 394b1e71b06SSteven Whitehouse ret = 0; 395b1e71b06SSteven Whitehouse pagevec_release(&pvec); 396b1e71b06SSteven Whitehouse cond_resched(); 397b1e71b06SSteven Whitehouse } 398b1e71b06SSteven Whitehouse 399774016b2SSteven Whitehouse if (!cycled && !done) { 400b1e71b06SSteven Whitehouse /* 401774016b2SSteven Whitehouse * range_cyclic: 402b1e71b06SSteven Whitehouse * We hit the last page and there is more work to be done: wrap 403b1e71b06SSteven Whitehouse * back to the start of the file 404b1e71b06SSteven Whitehouse */ 405774016b2SSteven Whitehouse cycled = 1; 406b1e71b06SSteven Whitehouse index = 0; 407774016b2SSteven Whitehouse end = writeback_index - 1; 408b1e71b06SSteven Whitehouse goto retry; 409b1e71b06SSteven Whitehouse } 410b1e71b06SSteven Whitehouse 411b1e71b06SSteven Whitehouse if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 412774016b2SSteven Whitehouse mapping->writeback_index = done_index; 413774016b2SSteven Whitehouse 414b1e71b06SSteven Whitehouse return ret; 415b1e71b06SSteven Whitehouse } 416b1e71b06SSteven Whitehouse 417b1e71b06SSteven Whitehouse 418b1e71b06SSteven Whitehouse /** 419b1e71b06SSteven Whitehouse * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk 420b1e71b06SSteven Whitehouse * @mapping: The mapping to write 421b1e71b06SSteven Whitehouse * @wbc: The writeback control 422b1e71b06SSteven Whitehouse * 423b1e71b06SSteven Whitehouse */ 424b1e71b06SSteven Whitehouse 425b1e71b06SSteven Whitehouse static int gfs2_jdata_writepages(struct address_space *mapping, 426b1e71b06SSteven Whitehouse struct writeback_control *wbc) 427b1e71b06SSteven Whitehouse { 428b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 429b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 430b1e71b06SSteven Whitehouse int ret; 431b1e71b06SSteven Whitehouse 432b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 433b1e71b06SSteven Whitehouse if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { 43424972557SBenjamin Marzinski gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH); 435b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 436b1e71b06SSteven Whitehouse } 437b1e71b06SSteven Whitehouse return ret; 438b1e71b06SSteven Whitehouse } 439b1e71b06SSteven Whitehouse 440b1e71b06SSteven Whitehouse /** 441b1e71b06SSteven Whitehouse * stuffed_readpage - Fill in a Linux page with stuffed file data 442b1e71b06SSteven Whitehouse * @ip: the inode 443b1e71b06SSteven Whitehouse * @page: the page 444b1e71b06SSteven Whitehouse * 445b1e71b06SSteven Whitehouse * Returns: errno 446b1e71b06SSteven Whitehouse */ 447b1e71b06SSteven Whitehouse 448b1e71b06SSteven Whitehouse static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) 449b1e71b06SSteven Whitehouse { 450b1e71b06SSteven Whitehouse struct buffer_head *dibh; 451602c89d2SSteven Whitehouse u64 dsize = i_size_read(&ip->i_inode); 452b1e71b06SSteven Whitehouse void *kaddr; 453b1e71b06SSteven Whitehouse int error; 454b1e71b06SSteven Whitehouse 455b1e71b06SSteven Whitehouse /* 456b1e71b06SSteven Whitehouse * Due to the order of unstuffing files and ->fault(), we can be 457b1e71b06SSteven Whitehouse * asked for a zero page in the case of a stuffed file being extended, 458b1e71b06SSteven Whitehouse * so we need to supply one here. It doesn't happen often. 459b1e71b06SSteven Whitehouse */ 460b1e71b06SSteven Whitehouse if (unlikely(page->index)) { 461b1e71b06SSteven Whitehouse zero_user(page, 0, PAGE_CACHE_SIZE); 462b1e71b06SSteven Whitehouse SetPageUptodate(page); 463b1e71b06SSteven Whitehouse return 0; 464b1e71b06SSteven Whitehouse } 465b1e71b06SSteven Whitehouse 466b1e71b06SSteven Whitehouse error = gfs2_meta_inode_buffer(ip, &dibh); 467b1e71b06SSteven Whitehouse if (error) 468b1e71b06SSteven Whitehouse return error; 469b1e71b06SSteven Whitehouse 470d9349285SCong Wang kaddr = kmap_atomic(page); 471602c89d2SSteven Whitehouse if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode))) 472602c89d2SSteven Whitehouse dsize = (dibh->b_size - sizeof(struct gfs2_dinode)); 473602c89d2SSteven Whitehouse memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); 474602c89d2SSteven Whitehouse memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize); 475d9349285SCong Wang kunmap_atomic(kaddr); 476b1e71b06SSteven Whitehouse flush_dcache_page(page); 477b1e71b06SSteven Whitehouse brelse(dibh); 478b1e71b06SSteven Whitehouse SetPageUptodate(page); 479b1e71b06SSteven Whitehouse 480b1e71b06SSteven Whitehouse return 0; 481b1e71b06SSteven Whitehouse } 482b1e71b06SSteven Whitehouse 483b1e71b06SSteven Whitehouse 484b1e71b06SSteven Whitehouse /** 485b1e71b06SSteven Whitehouse * __gfs2_readpage - readpage 486b1e71b06SSteven Whitehouse * @file: The file to read a page for 487b1e71b06SSteven Whitehouse * @page: The page to read 488b1e71b06SSteven Whitehouse * 489b1e71b06SSteven Whitehouse * This is the core of gfs2's readpage. Its used by the internal file 490b1e71b06SSteven Whitehouse * reading code as in that case we already hold the glock. Also its 491b1e71b06SSteven Whitehouse * called by gfs2_readpage() once the required lock has been granted. 492b1e71b06SSteven Whitehouse * 493b1e71b06SSteven Whitehouse */ 494b1e71b06SSteven Whitehouse 495b1e71b06SSteven Whitehouse static int __gfs2_readpage(void *file, struct page *page) 496b1e71b06SSteven Whitehouse { 497b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(page->mapping->host); 498b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 499b1e71b06SSteven Whitehouse int error; 500b1e71b06SSteven Whitehouse 501b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 502b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 503b1e71b06SSteven Whitehouse unlock_page(page); 504b1e71b06SSteven Whitehouse } else { 505b1e71b06SSteven Whitehouse error = mpage_readpage(page, gfs2_block_map); 506b1e71b06SSteven Whitehouse } 507b1e71b06SSteven Whitehouse 508b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 509b1e71b06SSteven Whitehouse return -EIO; 510b1e71b06SSteven Whitehouse 511b1e71b06SSteven Whitehouse return error; 512b1e71b06SSteven Whitehouse } 513b1e71b06SSteven Whitehouse 514b1e71b06SSteven Whitehouse /** 515b1e71b06SSteven Whitehouse * gfs2_readpage - read a page of a file 516b1e71b06SSteven Whitehouse * @file: The file to read 517b1e71b06SSteven Whitehouse * @page: The page of the file 518b1e71b06SSteven Whitehouse * 519b1e71b06SSteven Whitehouse * This deals with the locking required. We have to unlock and 520b1e71b06SSteven Whitehouse * relock the page in order to get the locking in the right 521b1e71b06SSteven Whitehouse * order. 522b1e71b06SSteven Whitehouse */ 523b1e71b06SSteven Whitehouse 524b1e71b06SSteven Whitehouse static int gfs2_readpage(struct file *file, struct page *page) 525b1e71b06SSteven Whitehouse { 526b1e71b06SSteven Whitehouse struct address_space *mapping = page->mapping; 527b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 528b1e71b06SSteven Whitehouse struct gfs2_holder gh; 529b1e71b06SSteven Whitehouse int error; 530b1e71b06SSteven Whitehouse 531b1e71b06SSteven Whitehouse unlock_page(page); 532b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 533b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&gh); 534b1e71b06SSteven Whitehouse if (unlikely(error)) 535b1e71b06SSteven Whitehouse goto out; 536b1e71b06SSteven Whitehouse error = AOP_TRUNCATED_PAGE; 537b1e71b06SSteven Whitehouse lock_page(page); 538b1e71b06SSteven Whitehouse if (page->mapping == mapping && !PageUptodate(page)) 539b1e71b06SSteven Whitehouse error = __gfs2_readpage(file, page); 540b1e71b06SSteven Whitehouse else 541b1e71b06SSteven Whitehouse unlock_page(page); 542b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 543b1e71b06SSteven Whitehouse out: 544b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 545b1e71b06SSteven Whitehouse if (error && error != AOP_TRUNCATED_PAGE) 546b1e71b06SSteven Whitehouse lock_page(page); 547b1e71b06SSteven Whitehouse return error; 548b1e71b06SSteven Whitehouse } 549b1e71b06SSteven Whitehouse 550b1e71b06SSteven Whitehouse /** 551b1e71b06SSteven Whitehouse * gfs2_internal_read - read an internal file 552b1e71b06SSteven Whitehouse * @ip: The gfs2 inode 553b1e71b06SSteven Whitehouse * @buf: The buffer to fill 554b1e71b06SSteven Whitehouse * @pos: The file position 555b1e71b06SSteven Whitehouse * @size: The amount to read 556b1e71b06SSteven Whitehouse * 557b1e71b06SSteven Whitehouse */ 558b1e71b06SSteven Whitehouse 5594306629eSAndrew Price int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, 5604306629eSAndrew Price unsigned size) 561b1e71b06SSteven Whitehouse { 562b1e71b06SSteven Whitehouse struct address_space *mapping = ip->i_inode.i_mapping; 563b1e71b06SSteven Whitehouse unsigned long index = *pos / PAGE_CACHE_SIZE; 564b1e71b06SSteven Whitehouse unsigned offset = *pos & (PAGE_CACHE_SIZE - 1); 565b1e71b06SSteven Whitehouse unsigned copied = 0; 566b1e71b06SSteven Whitehouse unsigned amt; 567b1e71b06SSteven Whitehouse struct page *page; 568b1e71b06SSteven Whitehouse void *p; 569b1e71b06SSteven Whitehouse 570b1e71b06SSteven Whitehouse do { 571b1e71b06SSteven Whitehouse amt = size - copied; 572b1e71b06SSteven Whitehouse if (offset + size > PAGE_CACHE_SIZE) 573b1e71b06SSteven Whitehouse amt = PAGE_CACHE_SIZE - offset; 574b1e71b06SSteven Whitehouse page = read_cache_page(mapping, index, __gfs2_readpage, NULL); 575b1e71b06SSteven Whitehouse if (IS_ERR(page)) 576b1e71b06SSteven Whitehouse return PTR_ERR(page); 577d9349285SCong Wang p = kmap_atomic(page); 578b1e71b06SSteven Whitehouse memcpy(buf + copied, p + offset, amt); 579d9349285SCong Wang kunmap_atomic(p); 580b1e71b06SSteven Whitehouse mark_page_accessed(page); 581b1e71b06SSteven Whitehouse page_cache_release(page); 582b1e71b06SSteven Whitehouse copied += amt; 583b1e71b06SSteven Whitehouse index++; 584b1e71b06SSteven Whitehouse offset = 0; 585b1e71b06SSteven Whitehouse } while(copied < size); 586b1e71b06SSteven Whitehouse (*pos) += size; 587b1e71b06SSteven Whitehouse return size; 588b1e71b06SSteven Whitehouse } 589b1e71b06SSteven Whitehouse 590b1e71b06SSteven Whitehouse /** 591b1e71b06SSteven Whitehouse * gfs2_readpages - Read a bunch of pages at once 592b1e71b06SSteven Whitehouse * 593b1e71b06SSteven Whitehouse * Some notes: 594b1e71b06SSteven Whitehouse * 1. This is only for readahead, so we can simply ignore any things 595b1e71b06SSteven Whitehouse * which are slightly inconvenient (such as locking conflicts between 596b1e71b06SSteven Whitehouse * the page lock and the glock) and return having done no I/O. Its 597b1e71b06SSteven Whitehouse * obviously not something we'd want to do on too regular a basis. 598b1e71b06SSteven Whitehouse * Any I/O we ignore at this time will be done via readpage later. 599b1e71b06SSteven Whitehouse * 2. We don't handle stuffed files here we let readpage do the honours. 600b1e71b06SSteven Whitehouse * 3. mpage_readpages() does most of the heavy lifting in the common case. 601b1e71b06SSteven Whitehouse * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. 602b1e71b06SSteven Whitehouse */ 603b1e71b06SSteven Whitehouse 604b1e71b06SSteven Whitehouse static int gfs2_readpages(struct file *file, struct address_space *mapping, 605b1e71b06SSteven Whitehouse struct list_head *pages, unsigned nr_pages) 606b1e71b06SSteven Whitehouse { 607b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 608b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 609b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 610b1e71b06SSteven Whitehouse struct gfs2_holder gh; 611b1e71b06SSteven Whitehouse int ret; 612b1e71b06SSteven Whitehouse 613b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 614b1e71b06SSteven Whitehouse ret = gfs2_glock_nq(&gh); 615b1e71b06SSteven Whitehouse if (unlikely(ret)) 616b1e71b06SSteven Whitehouse goto out_uninit; 617b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 618b1e71b06SSteven Whitehouse ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); 619b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 620b1e71b06SSteven Whitehouse out_uninit: 621b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 622b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 623b1e71b06SSteven Whitehouse ret = -EIO; 624b1e71b06SSteven Whitehouse return ret; 625b1e71b06SSteven Whitehouse } 626b1e71b06SSteven Whitehouse 627b1e71b06SSteven Whitehouse /** 628b1e71b06SSteven Whitehouse * gfs2_write_begin - Begin to write to a file 629b1e71b06SSteven Whitehouse * @file: The file to write to 630b1e71b06SSteven Whitehouse * @mapping: The mapping in which to write 631b1e71b06SSteven Whitehouse * @pos: The file offset at which to start writing 632b1e71b06SSteven Whitehouse * @len: Length of the write 633b1e71b06SSteven Whitehouse * @flags: Various flags 634b1e71b06SSteven Whitehouse * @pagep: Pointer to return the page 635b1e71b06SSteven Whitehouse * @fsdata: Pointer to return fs data (unused by GFS2) 636b1e71b06SSteven Whitehouse * 637b1e71b06SSteven Whitehouse * Returns: errno 638b1e71b06SSteven Whitehouse */ 639b1e71b06SSteven Whitehouse 640b1e71b06SSteven Whitehouse static int gfs2_write_begin(struct file *file, struct address_space *mapping, 641b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned flags, 642b1e71b06SSteven Whitehouse struct page **pagep, void **fsdata) 643b1e71b06SSteven Whitehouse { 644b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 645b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 6461946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 647b1e71b06SSteven Whitehouse unsigned int data_blocks = 0, ind_blocks = 0, rblocks; 64871f890f7SSteven Whitehouse unsigned requested = 0; 649b1e71b06SSteven Whitehouse int alloc_required; 650b1e71b06SSteven Whitehouse int error = 0; 651b1e71b06SSteven Whitehouse pgoff_t index = pos >> PAGE_CACHE_SHIFT; 652b1e71b06SSteven Whitehouse unsigned from = pos & (PAGE_CACHE_SIZE - 1); 653b1e71b06SSteven Whitehouse struct page *page; 654b1e71b06SSteven Whitehouse 655b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); 656b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&ip->i_gh); 657b1e71b06SSteven Whitehouse if (unlikely(error)) 658b1e71b06SSteven Whitehouse goto out_uninit; 6591946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 6601946f70aSBenjamin Marzinski error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 6611946f70aSBenjamin Marzinski GL_NOCACHE, &m_ip->i_gh); 6621946f70aSBenjamin Marzinski if (unlikely(error)) { 6631946f70aSBenjamin Marzinski gfs2_glock_dq(&ip->i_gh); 6641946f70aSBenjamin Marzinski goto out_uninit; 6651946f70aSBenjamin Marzinski } 6661946f70aSBenjamin Marzinski } 667b1e71b06SSteven Whitehouse 668461cb419SBob Peterson alloc_required = gfs2_write_alloc_required(ip, pos, len); 669b1e71b06SSteven Whitehouse 670b1e71b06SSteven Whitehouse if (alloc_required || gfs2_is_jdata(ip)) 671b1e71b06SSteven Whitehouse gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); 672b1e71b06SSteven Whitehouse 673b1e71b06SSteven Whitehouse if (alloc_required) { 6747b9cff46SSteven Whitehouse struct gfs2_alloc_parms ap = { .aflags = 0, }; 675b1e71b06SSteven Whitehouse error = gfs2_quota_lock_check(ip); 676b1e71b06SSteven Whitehouse if (error) 6775407e242SBob Peterson goto out_unlock; 678b1e71b06SSteven Whitehouse 67971f890f7SSteven Whitehouse requested = data_blocks + ind_blocks; 6807b9cff46SSteven Whitehouse ap.target = requested; 6817b9cff46SSteven Whitehouse error = gfs2_inplace_reserve(ip, &ap); 682b1e71b06SSteven Whitehouse if (error) 683b1e71b06SSteven Whitehouse goto out_qunlock; 684b1e71b06SSteven Whitehouse } 685b1e71b06SSteven Whitehouse 686b1e71b06SSteven Whitehouse rblocks = RES_DINODE + ind_blocks; 687b1e71b06SSteven Whitehouse if (gfs2_is_jdata(ip)) 688b1e71b06SSteven Whitehouse rblocks += data_blocks ? data_blocks : 1; 689b1e71b06SSteven Whitehouse if (ind_blocks || data_blocks) 690b1e71b06SSteven Whitehouse rblocks += RES_STATFS + RES_QUOTA; 6911946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) 6921946f70aSBenjamin Marzinski rblocks += 2 * RES_STATFS; 693bf97b673SBenjamin Marzinski if (alloc_required) 69471f890f7SSteven Whitehouse rblocks += gfs2_rg_blocks(ip, requested); 695b1e71b06SSteven Whitehouse 696b1e71b06SSteven Whitehouse error = gfs2_trans_begin(sdp, rblocks, 697b1e71b06SSteven Whitehouse PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); 698b1e71b06SSteven Whitehouse if (error) 699b1e71b06SSteven Whitehouse goto out_trans_fail; 700b1e71b06SSteven Whitehouse 701b1e71b06SSteven Whitehouse error = -ENOMEM; 702b1e71b06SSteven Whitehouse flags |= AOP_FLAG_NOFS; 703b1e71b06SSteven Whitehouse page = grab_cache_page_write_begin(mapping, index, flags); 704b1e71b06SSteven Whitehouse *pagep = page; 705b1e71b06SSteven Whitehouse if (unlikely(!page)) 706b1e71b06SSteven Whitehouse goto out_endtrans; 707b1e71b06SSteven Whitehouse 708b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 709b1e71b06SSteven Whitehouse error = 0; 710b1e71b06SSteven Whitehouse if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { 711b1e71b06SSteven Whitehouse error = gfs2_unstuff_dinode(ip, page); 712b1e71b06SSteven Whitehouse if (error == 0) 713b1e71b06SSteven Whitehouse goto prepare_write; 714b1e71b06SSteven Whitehouse } else if (!PageUptodate(page)) { 715b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 716b1e71b06SSteven Whitehouse } 717b1e71b06SSteven Whitehouse goto out; 718b1e71b06SSteven Whitehouse } 719b1e71b06SSteven Whitehouse 720b1e71b06SSteven Whitehouse prepare_write: 721ebdec241SChristoph Hellwig error = __block_write_begin(page, from, len, gfs2_block_map); 722b1e71b06SSteven Whitehouse out: 723b1e71b06SSteven Whitehouse if (error == 0) 724b1e71b06SSteven Whitehouse return 0; 725b1e71b06SSteven Whitehouse 7266c474f7bSMaxim unlock_page(page); 727b1e71b06SSteven Whitehouse page_cache_release(page); 72815c6fd97Snpiggin@suse.de 729ff8f33c8SSteven Whitehouse gfs2_trans_end(sdp); 730b1e71b06SSteven Whitehouse if (pos + len > ip->i_inode.i_size) 731ff8f33c8SSteven Whitehouse gfs2_trim_blocks(&ip->i_inode); 732ff8f33c8SSteven Whitehouse goto out_trans_fail; 733ff8f33c8SSteven Whitehouse 734b1e71b06SSteven Whitehouse out_endtrans: 735b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 736b1e71b06SSteven Whitehouse out_trans_fail: 737b1e71b06SSteven Whitehouse if (alloc_required) { 738b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 739b1e71b06SSteven Whitehouse out_qunlock: 740b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 741b1e71b06SSteven Whitehouse } 742b1e71b06SSteven Whitehouse out_unlock: 7431946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 7441946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 7451946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 7461946f70aSBenjamin Marzinski } 747b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 748b1e71b06SSteven Whitehouse out_uninit: 749b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 750b1e71b06SSteven Whitehouse return error; 751b1e71b06SSteven Whitehouse } 752b1e71b06SSteven Whitehouse 753b1e71b06SSteven Whitehouse /** 754b1e71b06SSteven Whitehouse * adjust_fs_space - Adjusts the free space available due to gfs2_grow 755b1e71b06SSteven Whitehouse * @inode: the rindex inode 756b1e71b06SSteven Whitehouse */ 757b1e71b06SSteven Whitehouse static void adjust_fs_space(struct inode *inode) 758b1e71b06SSteven Whitehouse { 759b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; 7601946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 7611946f70aSBenjamin Marzinski struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 762b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 763b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 7641946f70aSBenjamin Marzinski struct buffer_head *m_bh, *l_bh; 765b1e71b06SSteven Whitehouse u64 fs_total, new_free; 766b1e71b06SSteven Whitehouse 767b1e71b06SSteven Whitehouse /* Total up the file system space, according to the latest rindex. */ 768b1e71b06SSteven Whitehouse fs_total = gfs2_ri_total(sdp); 7691946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) 7701946f70aSBenjamin Marzinski return; 771b1e71b06SSteven Whitehouse 772b1e71b06SSteven Whitehouse spin_lock(&sdp->sd_statfs_spin); 7731946f70aSBenjamin Marzinski gfs2_statfs_change_in(m_sc, m_bh->b_data + 7741946f70aSBenjamin Marzinski sizeof(struct gfs2_dinode)); 775b1e71b06SSteven Whitehouse if (fs_total > (m_sc->sc_total + l_sc->sc_total)) 776b1e71b06SSteven Whitehouse new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); 777b1e71b06SSteven Whitehouse else 778b1e71b06SSteven Whitehouse new_free = 0; 779b1e71b06SSteven Whitehouse spin_unlock(&sdp->sd_statfs_spin); 780b1e71b06SSteven Whitehouse fs_warn(sdp, "File system extended by %llu blocks.\n", 781b1e71b06SSteven Whitehouse (unsigned long long)new_free); 782b1e71b06SSteven Whitehouse gfs2_statfs_change(sdp, new_free, new_free, 0); 7831946f70aSBenjamin Marzinski 7841946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) 7851946f70aSBenjamin Marzinski goto out; 7861946f70aSBenjamin Marzinski update_statfs(sdp, m_bh, l_bh); 7871946f70aSBenjamin Marzinski brelse(l_bh); 7881946f70aSBenjamin Marzinski out: 7891946f70aSBenjamin Marzinski brelse(m_bh); 790b1e71b06SSteven Whitehouse } 791b1e71b06SSteven Whitehouse 792b1e71b06SSteven Whitehouse /** 793b1e71b06SSteven Whitehouse * gfs2_stuffed_write_end - Write end for stuffed files 794b1e71b06SSteven Whitehouse * @inode: The inode 795b1e71b06SSteven Whitehouse * @dibh: The buffer_head containing the on-disk inode 796b1e71b06SSteven Whitehouse * @pos: The file position 797b1e71b06SSteven Whitehouse * @len: The length of the write 798b1e71b06SSteven Whitehouse * @copied: How much was actually copied by the VFS 799b1e71b06SSteven Whitehouse * @page: The page 800b1e71b06SSteven Whitehouse * 801b1e71b06SSteven Whitehouse * This copies the data from the page into the inode block after 802b1e71b06SSteven Whitehouse * the inode data structure itself. 803b1e71b06SSteven Whitehouse * 804b1e71b06SSteven Whitehouse * Returns: errno 805b1e71b06SSteven Whitehouse */ 806b1e71b06SSteven Whitehouse static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, 807b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 808b1e71b06SSteven Whitehouse struct page *page) 809b1e71b06SSteven Whitehouse { 810b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 811b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 8121946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 813b1e71b06SSteven Whitehouse u64 to = pos + copied; 814b1e71b06SSteven Whitehouse void *kaddr; 815b1e71b06SSteven Whitehouse unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); 816b1e71b06SSteven Whitehouse 817b1e71b06SSteven Whitehouse BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode))); 818d9349285SCong Wang kaddr = kmap_atomic(page); 819b1e71b06SSteven Whitehouse memcpy(buf + pos, kaddr + pos, copied); 820b1e71b06SSteven Whitehouse memset(kaddr + pos + copied, 0, len - copied); 821b1e71b06SSteven Whitehouse flush_dcache_page(page); 822d9349285SCong Wang kunmap_atomic(kaddr); 823b1e71b06SSteven Whitehouse 824b1e71b06SSteven Whitehouse if (!PageUptodate(page)) 825b1e71b06SSteven Whitehouse SetPageUptodate(page); 826b1e71b06SSteven Whitehouse unlock_page(page); 827b1e71b06SSteven Whitehouse page_cache_release(page); 828b1e71b06SSteven Whitehouse 829b1e71b06SSteven Whitehouse if (copied) { 830a2e0f799SSteven Whitehouse if (inode->i_size < to) 831b1e71b06SSteven Whitehouse i_size_write(inode, to); 832b1e71b06SSteven Whitehouse mark_inode_dirty(inode); 833b1e71b06SSteven Whitehouse } 834b1e71b06SSteven Whitehouse 8359ae3c6deSBenjamin Marzinski if (inode == sdp->sd_rindex) { 836b1e71b06SSteven Whitehouse adjust_fs_space(inode); 837ca9248d8SBob Peterson sdp->sd_rindex_uptodate = 0; 8389ae3c6deSBenjamin Marzinski } 839b1e71b06SSteven Whitehouse 840b1e71b06SSteven Whitehouse brelse(dibh); 841b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 8421946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 8431946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 8441946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 8451946f70aSBenjamin Marzinski } 846b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 847b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 848b1e71b06SSteven Whitehouse return copied; 849b1e71b06SSteven Whitehouse } 850b1e71b06SSteven Whitehouse 851b1e71b06SSteven Whitehouse /** 852b1e71b06SSteven Whitehouse * gfs2_write_end 853b1e71b06SSteven Whitehouse * @file: The file to write to 854b1e71b06SSteven Whitehouse * @mapping: The address space to write to 855b1e71b06SSteven Whitehouse * @pos: The file position 856b1e71b06SSteven Whitehouse * @len: The length of the data 857b1e71b06SSteven Whitehouse * @copied: 858b1e71b06SSteven Whitehouse * @page: The page that has been written 859b1e71b06SSteven Whitehouse * @fsdata: The fsdata (unused in GFS2) 860b1e71b06SSteven Whitehouse * 861b1e71b06SSteven Whitehouse * The main write_end function for GFS2. We have a separate one for 862b1e71b06SSteven Whitehouse * stuffed files as they are slightly different, otherwise we just 863b1e71b06SSteven Whitehouse * put our locking around the VFS provided functions. 864b1e71b06SSteven Whitehouse * 865b1e71b06SSteven Whitehouse * Returns: errno 866b1e71b06SSteven Whitehouse */ 867b1e71b06SSteven Whitehouse 868b1e71b06SSteven Whitehouse static int gfs2_write_end(struct file *file, struct address_space *mapping, 869b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 870b1e71b06SSteven Whitehouse struct page *page, void *fsdata) 871b1e71b06SSteven Whitehouse { 872b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 873b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 874b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 8751946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 876b1e71b06SSteven Whitehouse struct buffer_head *dibh; 877b1e71b06SSteven Whitehouse unsigned int from = pos & (PAGE_CACHE_SIZE - 1); 878b1e71b06SSteven Whitehouse unsigned int to = from + len; 879b1e71b06SSteven Whitehouse int ret; 8800c901809SBenjamin Marzinski struct gfs2_trans *tr = current->journal_info; 8810c901809SBenjamin Marzinski BUG_ON(!tr); 882b1e71b06SSteven Whitehouse 883b1e71b06SSteven Whitehouse BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); 884b1e71b06SSteven Whitehouse 885b1e71b06SSteven Whitehouse ret = gfs2_meta_inode_buffer(ip, &dibh); 886b1e71b06SSteven Whitehouse if (unlikely(ret)) { 887b1e71b06SSteven Whitehouse unlock_page(page); 888b1e71b06SSteven Whitehouse page_cache_release(page); 889b1e71b06SSteven Whitehouse goto failed; 890b1e71b06SSteven Whitehouse } 891b1e71b06SSteven Whitehouse 892b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 893b1e71b06SSteven Whitehouse return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); 894b1e71b06SSteven Whitehouse 895b1e71b06SSteven Whitehouse if (!gfs2_is_writeback(ip)) 896b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, from, to); 897b1e71b06SSteven Whitehouse 898b1e71b06SSteven Whitehouse ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); 8990c901809SBenjamin Marzinski if (tr->tr_num_buf_new) 9000c901809SBenjamin Marzinski __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 9010c901809SBenjamin Marzinski else 9020c901809SBenjamin Marzinski gfs2_trans_add_meta(ip->i_gl, dibh); 9030c901809SBenjamin Marzinski 904b1e71b06SSteven Whitehouse 9059ae3c6deSBenjamin Marzinski if (inode == sdp->sd_rindex) { 906b1e71b06SSteven Whitehouse adjust_fs_space(inode); 907ca9248d8SBob Peterson sdp->sd_rindex_uptodate = 0; 9089ae3c6deSBenjamin Marzinski } 909b1e71b06SSteven Whitehouse 910b1e71b06SSteven Whitehouse brelse(dibh); 911b1e71b06SSteven Whitehouse failed: 912deab72d3SBob Peterson gfs2_trans_end(sdp); 913b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 9145407e242SBob Peterson if (ip->i_res->rs_qa_qd_num) 915b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 9161946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 9171946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 9181946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 9191946f70aSBenjamin Marzinski } 920b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 921b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 922b1e71b06SSteven Whitehouse return ret; 923b1e71b06SSteven Whitehouse } 924b1e71b06SSteven Whitehouse 925b1e71b06SSteven Whitehouse /** 926b1e71b06SSteven Whitehouse * gfs2_set_page_dirty - Page dirtying function 927b1e71b06SSteven Whitehouse * @page: The page to dirty 928b1e71b06SSteven Whitehouse * 929b1e71b06SSteven Whitehouse * Returns: 1 if it dirtyed the page, or 0 otherwise 930b1e71b06SSteven Whitehouse */ 931b1e71b06SSteven Whitehouse 932b1e71b06SSteven Whitehouse static int gfs2_set_page_dirty(struct page *page) 933b1e71b06SSteven Whitehouse { 934b1e71b06SSteven Whitehouse SetPageChecked(page); 935b1e71b06SSteven Whitehouse return __set_page_dirty_buffers(page); 936b1e71b06SSteven Whitehouse } 937b1e71b06SSteven Whitehouse 938b1e71b06SSteven Whitehouse /** 939b1e71b06SSteven Whitehouse * gfs2_bmap - Block map function 940b1e71b06SSteven Whitehouse * @mapping: Address space info 941b1e71b06SSteven Whitehouse * @lblock: The block to map 942b1e71b06SSteven Whitehouse * 943b1e71b06SSteven Whitehouse * Returns: The disk address for the block or 0 on hole or error 944b1e71b06SSteven Whitehouse */ 945b1e71b06SSteven Whitehouse 946b1e71b06SSteven Whitehouse static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) 947b1e71b06SSteven Whitehouse { 948b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 949b1e71b06SSteven Whitehouse struct gfs2_holder i_gh; 950b1e71b06SSteven Whitehouse sector_t dblock = 0; 951b1e71b06SSteven Whitehouse int error; 952b1e71b06SSteven Whitehouse 953b1e71b06SSteven Whitehouse error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 954b1e71b06SSteven Whitehouse if (error) 955b1e71b06SSteven Whitehouse return 0; 956b1e71b06SSteven Whitehouse 957b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 958b1e71b06SSteven Whitehouse dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); 959b1e71b06SSteven Whitehouse 960b1e71b06SSteven Whitehouse gfs2_glock_dq_uninit(&i_gh); 961b1e71b06SSteven Whitehouse 962b1e71b06SSteven Whitehouse return dblock; 963b1e71b06SSteven Whitehouse } 964b1e71b06SSteven Whitehouse 965b1e71b06SSteven Whitehouse static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) 966b1e71b06SSteven Whitehouse { 967b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 968b1e71b06SSteven Whitehouse 969b1e71b06SSteven Whitehouse lock_buffer(bh); 970b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 971b1e71b06SSteven Whitehouse clear_buffer_dirty(bh); 972b1e71b06SSteven Whitehouse bd = bh->b_private; 973b1e71b06SSteven Whitehouse if (bd) { 974c0752aa7SBob Peterson if (!list_empty(&bd->bd_list) && !buffer_pinned(bh)) 975c0752aa7SBob Peterson list_del_init(&bd->bd_list); 976b1e71b06SSteven Whitehouse else 977b1e71b06SSteven Whitehouse gfs2_remove_from_journal(bh, current->journal_info, 0); 978b1e71b06SSteven Whitehouse } 979b1e71b06SSteven Whitehouse bh->b_bdev = NULL; 980b1e71b06SSteven Whitehouse clear_buffer_mapped(bh); 981b1e71b06SSteven Whitehouse clear_buffer_req(bh); 982b1e71b06SSteven Whitehouse clear_buffer_new(bh); 983b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 984b1e71b06SSteven Whitehouse unlock_buffer(bh); 985b1e71b06SSteven Whitehouse } 986b1e71b06SSteven Whitehouse 987d47992f8SLukas Czerner static void gfs2_invalidatepage(struct page *page, unsigned int offset, 988d47992f8SLukas Czerner unsigned int length) 989b1e71b06SSteven Whitehouse { 990b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 9915c0bb97cSLukas Czerner unsigned int stop = offset + length; 9925c0bb97cSLukas Czerner int partial_page = (offset || length < PAGE_CACHE_SIZE); 993b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 994b1e71b06SSteven Whitehouse unsigned long pos = 0; 995b1e71b06SSteven Whitehouse 996b1e71b06SSteven Whitehouse BUG_ON(!PageLocked(page)); 9975c0bb97cSLukas Czerner if (!partial_page) 998b1e71b06SSteven Whitehouse ClearPageChecked(page); 999b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 1000b1e71b06SSteven Whitehouse goto out; 1001b1e71b06SSteven Whitehouse 1002b1e71b06SSteven Whitehouse bh = head = page_buffers(page); 1003b1e71b06SSteven Whitehouse do { 10045c0bb97cSLukas Czerner if (pos + bh->b_size > stop) 10055c0bb97cSLukas Czerner return; 10065c0bb97cSLukas Czerner 1007b1e71b06SSteven Whitehouse if (offset <= pos) 1008b1e71b06SSteven Whitehouse gfs2_discard(sdp, bh); 1009b1e71b06SSteven Whitehouse pos += bh->b_size; 1010b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1011b1e71b06SSteven Whitehouse } while (bh != head); 1012b1e71b06SSteven Whitehouse out: 10135c0bb97cSLukas Czerner if (!partial_page) 1014b1e71b06SSteven Whitehouse try_to_release_page(page, 0); 1015b1e71b06SSteven Whitehouse } 1016b1e71b06SSteven Whitehouse 1017b1e71b06SSteven Whitehouse /** 1018b1e71b06SSteven Whitehouse * gfs2_ok_for_dio - check that dio is valid on this file 1019b1e71b06SSteven Whitehouse * @ip: The inode 1020b1e71b06SSteven Whitehouse * @rw: READ or WRITE 1021b1e71b06SSteven Whitehouse * @offset: The offset at which we are reading or writing 1022b1e71b06SSteven Whitehouse * 1023b1e71b06SSteven Whitehouse * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) 1024b1e71b06SSteven Whitehouse * 1 (to accept the i/o request) 1025b1e71b06SSteven Whitehouse */ 1026b1e71b06SSteven Whitehouse static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset) 1027b1e71b06SSteven Whitehouse { 1028b1e71b06SSteven Whitehouse /* 1029b1e71b06SSteven Whitehouse * Should we return an error here? I can't see that O_DIRECT for 1030b1e71b06SSteven Whitehouse * a stuffed file makes any sense. For now we'll silently fall 1031b1e71b06SSteven Whitehouse * back to buffered I/O 1032b1e71b06SSteven Whitehouse */ 1033b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 1034b1e71b06SSteven Whitehouse return 0; 1035b1e71b06SSteven Whitehouse 1036b1e71b06SSteven Whitehouse if (offset >= i_size_read(&ip->i_inode)) 1037b1e71b06SSteven Whitehouse return 0; 1038b1e71b06SSteven Whitehouse return 1; 1039b1e71b06SSteven Whitehouse } 1040b1e71b06SSteven Whitehouse 1041b1e71b06SSteven Whitehouse 1042b1e71b06SSteven Whitehouse 1043b1e71b06SSteven Whitehouse static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, 1044b1e71b06SSteven Whitehouse const struct iovec *iov, loff_t offset, 1045b1e71b06SSteven Whitehouse unsigned long nr_segs) 1046b1e71b06SSteven Whitehouse { 1047b1e71b06SSteven Whitehouse struct file *file = iocb->ki_filp; 1048b1e71b06SSteven Whitehouse struct inode *inode = file->f_mapping->host; 1049dfd11184SSteven Whitehouse struct address_space *mapping = inode->i_mapping; 1050b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1051b1e71b06SSteven Whitehouse struct gfs2_holder gh; 1052b1e71b06SSteven Whitehouse int rv; 1053b1e71b06SSteven Whitehouse 1054b1e71b06SSteven Whitehouse /* 1055b1e71b06SSteven Whitehouse * Deferred lock, even if its a write, since we do no allocation 1056b1e71b06SSteven Whitehouse * on this path. All we need change is atime, and this lock mode 1057b1e71b06SSteven Whitehouse * ensures that other nodes have flushed their buffered read caches 1058b1e71b06SSteven Whitehouse * (i.e. their page cache entries for this inode). We do not, 1059b1e71b06SSteven Whitehouse * unfortunately have the option of only flushing a range like 1060b1e71b06SSteven Whitehouse * the VFS does. 1061b1e71b06SSteven Whitehouse */ 1062b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); 1063b1e71b06SSteven Whitehouse rv = gfs2_glock_nq(&gh); 1064b1e71b06SSteven Whitehouse if (rv) 1065b1e71b06SSteven Whitehouse return rv; 1066b1e71b06SSteven Whitehouse rv = gfs2_ok_for_dio(ip, rw, offset); 1067b1e71b06SSteven Whitehouse if (rv != 1) 1068b1e71b06SSteven Whitehouse goto out; /* dio not valid, fall back to buffered i/o */ 1069b1e71b06SSteven Whitehouse 1070dfd11184SSteven Whitehouse /* 1071dfd11184SSteven Whitehouse * Now since we are holding a deferred (CW) lock at this point, you 1072dfd11184SSteven Whitehouse * might be wondering why this is ever needed. There is a case however 1073dfd11184SSteven Whitehouse * where we've granted a deferred local lock against a cached exclusive 1074dfd11184SSteven Whitehouse * glock. That is ok provided all granted local locks are deferred, but 1075dfd11184SSteven Whitehouse * it also means that it is possible to encounter pages which are 1076dfd11184SSteven Whitehouse * cached and possibly also mapped. So here we check for that and sort 1077dfd11184SSteven Whitehouse * them out ahead of the dio. The glock state machine will take care of 1078dfd11184SSteven Whitehouse * everything else. 1079dfd11184SSteven Whitehouse * 1080dfd11184SSteven Whitehouse * If in fact the cached glock state (gl->gl_state) is deferred (CW) in 1081dfd11184SSteven Whitehouse * the first place, mapping->nr_pages will always be zero. 1082dfd11184SSteven Whitehouse */ 1083dfd11184SSteven Whitehouse if (mapping->nrpages) { 1084dfd11184SSteven Whitehouse loff_t lstart = offset & (PAGE_CACHE_SIZE - 1); 1085dfd11184SSteven Whitehouse loff_t len = iov_length(iov, nr_segs); 1086dfd11184SSteven Whitehouse loff_t end = PAGE_ALIGN(offset + len) - 1; 1087dfd11184SSteven Whitehouse 1088dfd11184SSteven Whitehouse rv = 0; 1089dfd11184SSteven Whitehouse if (len == 0) 1090dfd11184SSteven Whitehouse goto out; 1091dfd11184SSteven Whitehouse if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags)) 1092dfd11184SSteven Whitehouse unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len); 1093dfd11184SSteven Whitehouse rv = filemap_write_and_wait_range(mapping, lstart, end); 1094dfd11184SSteven Whitehouse if (rv) 1095086352f1SSteven Whitehouse goto out; 1096086352f1SSteven Whitehouse if (rw == WRITE) 1097dfd11184SSteven Whitehouse truncate_inode_pages_range(mapping, lstart, end); 1098dfd11184SSteven Whitehouse } 1099dfd11184SSteven Whitehouse 1100eafdc7d1SChristoph Hellwig rv = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 1101eafdc7d1SChristoph Hellwig offset, nr_segs, gfs2_get_block_direct, 1102eafdc7d1SChristoph Hellwig NULL, NULL, 0); 1103b1e71b06SSteven Whitehouse out: 11048e711e10SBob Peterson gfs2_glock_dq(&gh); 1105b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 1106b1e71b06SSteven Whitehouse return rv; 1107b1e71b06SSteven Whitehouse } 1108b1e71b06SSteven Whitehouse 1109b1e71b06SSteven Whitehouse /** 1110b1e71b06SSteven Whitehouse * gfs2_releasepage - free the metadata associated with a page 1111b1e71b06SSteven Whitehouse * @page: the page that's being released 1112b1e71b06SSteven Whitehouse * @gfp_mask: passed from Linux VFS, ignored by us 1113b1e71b06SSteven Whitehouse * 1114b1e71b06SSteven Whitehouse * Call try_to_free_buffers() if the buffers in this page can be 1115b1e71b06SSteven Whitehouse * released. 1116b1e71b06SSteven Whitehouse * 1117b1e71b06SSteven Whitehouse * Returns: 0 1118b1e71b06SSteven Whitehouse */ 1119b1e71b06SSteven Whitehouse 1120b1e71b06SSteven Whitehouse int gfs2_releasepage(struct page *page, gfp_t gfp_mask) 1121b1e71b06SSteven Whitehouse { 1122009d8518SSteven Whitehouse struct address_space *mapping = page->mapping; 1123009d8518SSteven Whitehouse struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 1124b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 1125b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 1126b1e71b06SSteven Whitehouse 1127b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 1128b1e71b06SSteven Whitehouse return 0; 1129b1e71b06SSteven Whitehouse 1130b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 1131380f7c65SSteven Whitehouse spin_lock(&sdp->sd_ail_lock); 1132b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1133b1e71b06SSteven Whitehouse do { 1134b1e71b06SSteven Whitehouse if (atomic_read(&bh->b_count)) 1135b1e71b06SSteven Whitehouse goto cannot_release; 1136b1e71b06SSteven Whitehouse bd = bh->b_private; 113716ca9412SBenjamin Marzinski if (bd && bd->bd_tr) 1138b1e71b06SSteven Whitehouse goto cannot_release; 11398f065d36SSteven Whitehouse if (buffer_pinned(bh) || buffer_dirty(bh)) 11408f065d36SSteven Whitehouse goto not_possible; 1141b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1142b1e71b06SSteven Whitehouse } while(bh != head); 1143380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 1144b1e71b06SSteven Whitehouse 1145b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1146b1e71b06SSteven Whitehouse do { 1147b1e71b06SSteven Whitehouse bd = bh->b_private; 1148b1e71b06SSteven Whitehouse if (bd) { 1149b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, bd->bd_bh == bh); 1150e4f29206SSteven Whitehouse if (!list_empty(&bd->bd_list)) 1151c0752aa7SBob Peterson list_del_init(&bd->bd_list); 1152b1e71b06SSteven Whitehouse bd->bd_bh = NULL; 1153b1e71b06SSteven Whitehouse bh->b_private = NULL; 1154b1e71b06SSteven Whitehouse kmem_cache_free(gfs2_bufdata_cachep, bd); 1155e4f29206SSteven Whitehouse } 1156b1e71b06SSteven Whitehouse 1157b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1158b1e71b06SSteven Whitehouse } while (bh != head); 1159e4f29206SSteven Whitehouse gfs2_log_unlock(sdp); 1160b1e71b06SSteven Whitehouse 1161b1e71b06SSteven Whitehouse return try_to_free_buffers(page); 11628f065d36SSteven Whitehouse 11638f065d36SSteven Whitehouse not_possible: /* Should never happen */ 11648f065d36SSteven Whitehouse WARN_ON(buffer_dirty(bh)); 11658f065d36SSteven Whitehouse WARN_ON(buffer_pinned(bh)); 1166b1e71b06SSteven Whitehouse cannot_release: 1167380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 1168b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1169b1e71b06SSteven Whitehouse return 0; 1170b1e71b06SSteven Whitehouse } 1171b1e71b06SSteven Whitehouse 1172b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_writeback_aops = { 11739d358143SSteven Whitehouse .writepage = gfs2_writepage, 117445138990SSteven Whitehouse .writepages = gfs2_writepages, 1175b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1176b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1177b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1178b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1179b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1180b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1181b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1182b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1183b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1184b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1185aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1186b1e71b06SSteven Whitehouse }; 1187b1e71b06SSteven Whitehouse 1188b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_ordered_aops = { 11899d358143SSteven Whitehouse .writepage = gfs2_writepage, 119045138990SSteven Whitehouse .writepages = gfs2_writepages, 1191b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1192b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1193b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1194b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1195b1e71b06SSteven Whitehouse .set_page_dirty = gfs2_set_page_dirty, 1196b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1197b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1198b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1199b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1200b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1201b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1202aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1203b1e71b06SSteven Whitehouse }; 1204b1e71b06SSteven Whitehouse 1205b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_jdata_aops = { 1206b1e71b06SSteven Whitehouse .writepage = gfs2_jdata_writepage, 1207b1e71b06SSteven Whitehouse .writepages = gfs2_jdata_writepages, 1208b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1209b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1210b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1211b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1212b1e71b06SSteven Whitehouse .set_page_dirty = gfs2_set_page_dirty, 1213b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1214b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1215b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1216b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1217aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1218b1e71b06SSteven Whitehouse }; 1219b1e71b06SSteven Whitehouse 1220b1e71b06SSteven Whitehouse void gfs2_set_aops(struct inode *inode) 1221b1e71b06SSteven Whitehouse { 1222b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1223b1e71b06SSteven Whitehouse 1224b1e71b06SSteven Whitehouse if (gfs2_is_writeback(ip)) 1225b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_writeback_aops; 1226b1e71b06SSteven Whitehouse else if (gfs2_is_ordered(ip)) 1227b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_ordered_aops; 1228b1e71b06SSteven Whitehouse else if (gfs2_is_jdata(ip)) 1229b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_jdata_aops; 1230b1e71b06SSteven Whitehouse else 1231b1e71b06SSteven Whitehouse BUG(); 1232b1e71b06SSteven Whitehouse } 1233b1e71b06SSteven Whitehouse 1234