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> 23e2e40f2cSChristoph Hellwig #include <linux/uio.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); 10409cbfeafSKirill A. Shutemov pgoff_t end_index = i_size >> PAGE_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) */ 11209cbfeafSKirill A. Shutemov offset = i_size & (PAGE_SIZE-1); 113b1e71b06SSteven Whitehouse if (page->index > end_index || (page->index == end_index && !offset)) { 11409cbfeafSKirill A. Shutemov page->mapping->a_ops->invalidatepage(page, 0, PAGE_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 143fd4c5748SBenjamin Marzinski /* This is the same as calling block_write_full_page, but it also 144fd4c5748SBenjamin Marzinski * writes pages outside of i_size 145fd4c5748SBenjamin Marzinski */ 146c548a1c1SAndrew Price static int gfs2_write_full_page(struct page *page, get_block_t *get_block, 147fd4c5748SBenjamin Marzinski struct writeback_control *wbc) 148fd4c5748SBenjamin Marzinski { 149fd4c5748SBenjamin Marzinski struct inode * const inode = page->mapping->host; 150fd4c5748SBenjamin Marzinski loff_t i_size = i_size_read(inode); 151fd4c5748SBenjamin Marzinski const pgoff_t end_index = i_size >> PAGE_SHIFT; 152fd4c5748SBenjamin Marzinski unsigned offset; 153fd4c5748SBenjamin Marzinski 154fd4c5748SBenjamin Marzinski /* 155fd4c5748SBenjamin Marzinski * The page straddles i_size. It must be zeroed out on each and every 156fd4c5748SBenjamin Marzinski * writepage invocation because it may be mmapped. "A file is mapped 157fd4c5748SBenjamin Marzinski * in multiples of the page size. For a file that is not a multiple of 158fd4c5748SBenjamin Marzinski * the page size, the remaining memory is zeroed when mapped, and 159fd4c5748SBenjamin Marzinski * writes to that region are not written out to the file." 160fd4c5748SBenjamin Marzinski */ 161fd4c5748SBenjamin Marzinski offset = i_size & (PAGE_SIZE-1); 162fd4c5748SBenjamin Marzinski if (page->index == end_index && offset) 163fd4c5748SBenjamin Marzinski zero_user_segment(page, offset, PAGE_SIZE); 164fd4c5748SBenjamin Marzinski 165fd4c5748SBenjamin Marzinski return __block_write_full_page(inode, page, get_block, wbc, 166fd4c5748SBenjamin Marzinski end_buffer_async_write); 167fd4c5748SBenjamin Marzinski } 168fd4c5748SBenjamin Marzinski 169b1e71b06SSteven Whitehouse /** 170b1e71b06SSteven Whitehouse * __gfs2_jdata_writepage - The core of jdata writepage 171b1e71b06SSteven Whitehouse * @page: The page to write 172b1e71b06SSteven Whitehouse * @wbc: The writeback control 173b1e71b06SSteven Whitehouse * 174b1e71b06SSteven Whitehouse * This is shared between writepage and writepages and implements the 175b1e71b06SSteven Whitehouse * core of the writepage operation. If a transaction is required then 176b1e71b06SSteven Whitehouse * PageChecked will have been set and the transaction will have 177b1e71b06SSteven Whitehouse * already been started before this is called. 178b1e71b06SSteven Whitehouse */ 179b1e71b06SSteven Whitehouse 180b1e71b06SSteven Whitehouse static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 181b1e71b06SSteven Whitehouse { 182b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 183b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 184b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 185b1e71b06SSteven Whitehouse 186b1e71b06SSteven Whitehouse if (PageChecked(page)) { 187b1e71b06SSteven Whitehouse ClearPageChecked(page); 188b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) { 189b1e71b06SSteven Whitehouse create_empty_buffers(page, inode->i_sb->s_blocksize, 19047a9a527SFabian Frederick BIT(BH_Dirty)|BIT(BH_Uptodate)); 191b1e71b06SSteven Whitehouse } 192b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); 193b1e71b06SSteven Whitehouse } 194fd4c5748SBenjamin Marzinski return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc); 195b1e71b06SSteven Whitehouse } 196b1e71b06SSteven Whitehouse 197b1e71b06SSteven Whitehouse /** 198b1e71b06SSteven Whitehouse * gfs2_jdata_writepage - Write complete page 199b1e71b06SSteven Whitehouse * @page: Page to write 2001272574bSFabian Frederick * @wbc: The writeback control 201b1e71b06SSteven Whitehouse * 202b1e71b06SSteven Whitehouse * Returns: errno 203b1e71b06SSteven Whitehouse * 204b1e71b06SSteven Whitehouse */ 205b1e71b06SSteven Whitehouse 206b1e71b06SSteven Whitehouse static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 207b1e71b06SSteven Whitehouse { 208b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 209fd4c5748SBenjamin Marzinski struct gfs2_inode *ip = GFS2_I(inode); 210b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 211b1e71b06SSteven Whitehouse int ret; 212b1e71b06SSteven Whitehouse 213fd4c5748SBenjamin Marzinski if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 214fd4c5748SBenjamin Marzinski goto out; 215fd4c5748SBenjamin Marzinski if (PageChecked(page) || current->journal_info) 216b1e71b06SSteven Whitehouse goto out_ignore; 217b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 218b1e71b06SSteven Whitehouse return ret; 219b1e71b06SSteven Whitehouse 220b1e71b06SSteven Whitehouse out_ignore: 221b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 222fd4c5748SBenjamin Marzinski out: 223b1e71b06SSteven Whitehouse unlock_page(page); 224b1e71b06SSteven Whitehouse return 0; 225b1e71b06SSteven Whitehouse } 226b1e71b06SSteven Whitehouse 227b1e71b06SSteven Whitehouse /** 22845138990SSteven Whitehouse * gfs2_writepages - Write a bunch of dirty pages back to disk 229b1e71b06SSteven Whitehouse * @mapping: The mapping to write 230b1e71b06SSteven Whitehouse * @wbc: Write-back control 231b1e71b06SSteven Whitehouse * 23245138990SSteven Whitehouse * Used for both ordered and writeback modes. 233b1e71b06SSteven Whitehouse */ 23445138990SSteven Whitehouse static int gfs2_writepages(struct address_space *mapping, 235b1e71b06SSteven Whitehouse struct writeback_control *wbc) 236b1e71b06SSteven Whitehouse { 237b066a4eeSAbhi Das struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 238b066a4eeSAbhi Das int ret = mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); 239b066a4eeSAbhi Das 240b066a4eeSAbhi Das /* 241b066a4eeSAbhi Das * Even if we didn't write any pages here, we might still be holding 242b066a4eeSAbhi Das * dirty pages in the ail. We forcibly flush the ail because we don't 243b066a4eeSAbhi Das * want balance_dirty_pages() to loop indefinitely trying to write out 244b066a4eeSAbhi Das * pages held in the ail that it can't find. 245b066a4eeSAbhi Das */ 246b066a4eeSAbhi Das if (ret == 0) 247b066a4eeSAbhi Das set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags); 248b066a4eeSAbhi Das 249b066a4eeSAbhi Das return ret; 250b1e71b06SSteven Whitehouse } 251b1e71b06SSteven Whitehouse 252b1e71b06SSteven Whitehouse /** 253b1e71b06SSteven Whitehouse * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages 254b1e71b06SSteven Whitehouse * @mapping: The mapping 255b1e71b06SSteven Whitehouse * @wbc: The writeback control 256b1e71b06SSteven Whitehouse * @pvec: The vector of pages 257b1e71b06SSteven Whitehouse * @nr_pages: The number of pages to write 2581272574bSFabian Frederick * @done_index: Page index 259b1e71b06SSteven Whitehouse * 260b1e71b06SSteven Whitehouse * Returns: non-zero if loop should terminate, zero otherwise 261b1e71b06SSteven Whitehouse */ 262b1e71b06SSteven Whitehouse 263b1e71b06SSteven Whitehouse static int gfs2_write_jdata_pagevec(struct address_space *mapping, 264b1e71b06SSteven Whitehouse struct writeback_control *wbc, 265b1e71b06SSteven Whitehouse struct pagevec *pvec, 2669aa01593SAndreas Gruenbacher int nr_pages, 267774016b2SSteven Whitehouse pgoff_t *done_index) 268b1e71b06SSteven Whitehouse { 269b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 270b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 27109cbfeafSKirill A. Shutemov unsigned nrblocks = nr_pages * (PAGE_SIZE/inode->i_sb->s_blocksize); 272b1e71b06SSteven Whitehouse int i; 273b1e71b06SSteven Whitehouse int ret; 274b1e71b06SSteven Whitehouse 275b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); 276b1e71b06SSteven Whitehouse if (ret < 0) 277b1e71b06SSteven Whitehouse return ret; 278b1e71b06SSteven Whitehouse 279b1e71b06SSteven Whitehouse for(i = 0; i < nr_pages; i++) { 280b1e71b06SSteven Whitehouse struct page *page = pvec->pages[i]; 281b1e71b06SSteven Whitehouse 282774016b2SSteven Whitehouse *done_index = page->index; 283774016b2SSteven Whitehouse 284b1e71b06SSteven Whitehouse lock_page(page); 285b1e71b06SSteven Whitehouse 286b1e71b06SSteven Whitehouse if (unlikely(page->mapping != mapping)) { 287774016b2SSteven Whitehouse continue_unlock: 288b1e71b06SSteven Whitehouse unlock_page(page); 289b1e71b06SSteven Whitehouse continue; 290b1e71b06SSteven Whitehouse } 291b1e71b06SSteven Whitehouse 292774016b2SSteven Whitehouse if (!PageDirty(page)) { 293774016b2SSteven Whitehouse /* someone wrote it for us */ 294774016b2SSteven Whitehouse goto continue_unlock; 295b1e71b06SSteven Whitehouse } 296b1e71b06SSteven Whitehouse 297774016b2SSteven Whitehouse if (PageWriteback(page)) { 298b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_NONE) 299b1e71b06SSteven Whitehouse wait_on_page_writeback(page); 300774016b2SSteven Whitehouse else 301774016b2SSteven Whitehouse goto continue_unlock; 302b1e71b06SSteven Whitehouse } 303b1e71b06SSteven Whitehouse 304774016b2SSteven Whitehouse BUG_ON(PageWriteback(page)); 305774016b2SSteven Whitehouse if (!clear_page_dirty_for_io(page)) 306774016b2SSteven Whitehouse goto continue_unlock; 307774016b2SSteven Whitehouse 308de1414a6SChristoph Hellwig trace_wbc_writepage(wbc, inode_to_bdi(inode)); 309b1e71b06SSteven Whitehouse 310b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 311774016b2SSteven Whitehouse if (unlikely(ret)) { 312774016b2SSteven Whitehouse if (ret == AOP_WRITEPAGE_ACTIVATE) { 313774016b2SSteven Whitehouse unlock_page(page); 314774016b2SSteven Whitehouse ret = 0; 315774016b2SSteven Whitehouse } else { 316b1e71b06SSteven Whitehouse 317774016b2SSteven Whitehouse /* 318774016b2SSteven Whitehouse * done_index is set past this page, 319774016b2SSteven Whitehouse * so media errors will not choke 320774016b2SSteven Whitehouse * background writeout for the entire 321774016b2SSteven Whitehouse * file. This has consequences for 322774016b2SSteven Whitehouse * range_cyclic semantics (ie. it may 323774016b2SSteven Whitehouse * not be suitable for data integrity 324774016b2SSteven Whitehouse * writeout). 325774016b2SSteven Whitehouse */ 326774016b2SSteven Whitehouse *done_index = page->index + 1; 327b1e71b06SSteven Whitehouse ret = 1; 328774016b2SSteven Whitehouse break; 329774016b2SSteven Whitehouse } 330774016b2SSteven Whitehouse } 331774016b2SSteven Whitehouse 332774016b2SSteven Whitehouse /* 333774016b2SSteven Whitehouse * We stop writing back only if we are not doing 334774016b2SSteven Whitehouse * integrity sync. In case of integrity sync we have to 335774016b2SSteven Whitehouse * keep going until we have written all the pages 336774016b2SSteven Whitehouse * we tagged for writeback prior to entering this loop. 337774016b2SSteven Whitehouse */ 338774016b2SSteven Whitehouse if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) { 339774016b2SSteven Whitehouse ret = 1; 340774016b2SSteven Whitehouse break; 341774016b2SSteven Whitehouse } 342774016b2SSteven Whitehouse 343b1e71b06SSteven Whitehouse } 344b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 345b1e71b06SSteven Whitehouse return ret; 346b1e71b06SSteven Whitehouse } 347b1e71b06SSteven Whitehouse 348b1e71b06SSteven Whitehouse /** 349b1e71b06SSteven Whitehouse * gfs2_write_cache_jdata - Like write_cache_pages but different 350b1e71b06SSteven Whitehouse * @mapping: The mapping to write 351b1e71b06SSteven Whitehouse * @wbc: The writeback control 352b1e71b06SSteven Whitehouse * 353b1e71b06SSteven Whitehouse * The reason that we use our own function here is that we need to 354b1e71b06SSteven Whitehouse * start transactions before we grab page locks. This allows us 355b1e71b06SSteven Whitehouse * to get the ordering right. 356b1e71b06SSteven Whitehouse */ 357b1e71b06SSteven Whitehouse 358b1e71b06SSteven Whitehouse static int gfs2_write_cache_jdata(struct address_space *mapping, 359b1e71b06SSteven Whitehouse struct writeback_control *wbc) 360b1e71b06SSteven Whitehouse { 361b1e71b06SSteven Whitehouse int ret = 0; 362b1e71b06SSteven Whitehouse int done = 0; 363b1e71b06SSteven Whitehouse struct pagevec pvec; 364b1e71b06SSteven Whitehouse int nr_pages; 365774016b2SSteven Whitehouse pgoff_t uninitialized_var(writeback_index); 366b1e71b06SSteven Whitehouse pgoff_t index; 367b1e71b06SSteven Whitehouse pgoff_t end; 368774016b2SSteven Whitehouse pgoff_t done_index; 369774016b2SSteven Whitehouse int cycled; 370b1e71b06SSteven Whitehouse int range_whole = 0; 371774016b2SSteven Whitehouse int tag; 372b1e71b06SSteven Whitehouse 37386679820SMel Gorman pagevec_init(&pvec); 374b1e71b06SSteven Whitehouse if (wbc->range_cyclic) { 375774016b2SSteven Whitehouse writeback_index = mapping->writeback_index; /* prev offset */ 376774016b2SSteven Whitehouse index = writeback_index; 377774016b2SSteven Whitehouse if (index == 0) 378774016b2SSteven Whitehouse cycled = 1; 379774016b2SSteven Whitehouse else 380774016b2SSteven Whitehouse cycled = 0; 381b1e71b06SSteven Whitehouse end = -1; 382b1e71b06SSteven Whitehouse } else { 38309cbfeafSKirill A. Shutemov index = wbc->range_start >> PAGE_SHIFT; 38409cbfeafSKirill A. Shutemov end = wbc->range_end >> PAGE_SHIFT; 385b1e71b06SSteven Whitehouse if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 386b1e71b06SSteven Whitehouse range_whole = 1; 387774016b2SSteven Whitehouse cycled = 1; /* ignore range_cyclic tests */ 388b1e71b06SSteven Whitehouse } 389774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 390774016b2SSteven Whitehouse tag = PAGECACHE_TAG_TOWRITE; 391774016b2SSteven Whitehouse else 392774016b2SSteven Whitehouse tag = PAGECACHE_TAG_DIRTY; 393b1e71b06SSteven Whitehouse 394b1e71b06SSteven Whitehouse retry: 395774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 396774016b2SSteven Whitehouse tag_pages_for_writeback(mapping, index, end); 397774016b2SSteven Whitehouse done_index = index; 398774016b2SSteven Whitehouse while (!done && (index <= end)) { 399d2bc5b3cSJan Kara nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end, 40067fd707fSJan Kara tag); 401774016b2SSteven Whitehouse if (nr_pages == 0) 402774016b2SSteven Whitehouse break; 403774016b2SSteven Whitehouse 4049aa01593SAndreas Gruenbacher ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, &done_index); 405b1e71b06SSteven Whitehouse if (ret) 406b1e71b06SSteven Whitehouse done = 1; 407b1e71b06SSteven Whitehouse if (ret > 0) 408b1e71b06SSteven Whitehouse ret = 0; 409b1e71b06SSteven Whitehouse pagevec_release(&pvec); 410b1e71b06SSteven Whitehouse cond_resched(); 411b1e71b06SSteven Whitehouse } 412b1e71b06SSteven Whitehouse 413774016b2SSteven Whitehouse if (!cycled && !done) { 414b1e71b06SSteven Whitehouse /* 415774016b2SSteven Whitehouse * range_cyclic: 416b1e71b06SSteven Whitehouse * We hit the last page and there is more work to be done: wrap 417b1e71b06SSteven Whitehouse * back to the start of the file 418b1e71b06SSteven Whitehouse */ 419774016b2SSteven Whitehouse cycled = 1; 420b1e71b06SSteven Whitehouse index = 0; 421774016b2SSteven Whitehouse end = writeback_index - 1; 422b1e71b06SSteven Whitehouse goto retry; 423b1e71b06SSteven Whitehouse } 424b1e71b06SSteven Whitehouse 425b1e71b06SSteven Whitehouse if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 426774016b2SSteven Whitehouse mapping->writeback_index = done_index; 427774016b2SSteven Whitehouse 428b1e71b06SSteven Whitehouse return ret; 429b1e71b06SSteven Whitehouse } 430b1e71b06SSteven Whitehouse 431b1e71b06SSteven Whitehouse 432b1e71b06SSteven Whitehouse /** 433b1e71b06SSteven Whitehouse * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk 434b1e71b06SSteven Whitehouse * @mapping: The mapping to write 435b1e71b06SSteven Whitehouse * @wbc: The writeback control 436b1e71b06SSteven Whitehouse * 437b1e71b06SSteven Whitehouse */ 438b1e71b06SSteven Whitehouse 439b1e71b06SSteven Whitehouse static int gfs2_jdata_writepages(struct address_space *mapping, 440b1e71b06SSteven Whitehouse struct writeback_control *wbc) 441b1e71b06SSteven Whitehouse { 442b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 443b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 444b1e71b06SSteven Whitehouse int ret; 445b1e71b06SSteven Whitehouse 446b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 447b1e71b06SSteven Whitehouse if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { 44824972557SBenjamin Marzinski gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH); 449b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 450b1e71b06SSteven Whitehouse } 451b1e71b06SSteven Whitehouse return ret; 452b1e71b06SSteven Whitehouse } 453b1e71b06SSteven Whitehouse 454b1e71b06SSteven Whitehouse /** 455b1e71b06SSteven Whitehouse * stuffed_readpage - Fill in a Linux page with stuffed file data 456b1e71b06SSteven Whitehouse * @ip: the inode 457b1e71b06SSteven Whitehouse * @page: the page 458b1e71b06SSteven Whitehouse * 459b1e71b06SSteven Whitehouse * Returns: errno 460b1e71b06SSteven Whitehouse */ 461b1e71b06SSteven Whitehouse 462b1e71b06SSteven Whitehouse static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) 463b1e71b06SSteven Whitehouse { 464b1e71b06SSteven Whitehouse struct buffer_head *dibh; 465602c89d2SSteven Whitehouse u64 dsize = i_size_read(&ip->i_inode); 466b1e71b06SSteven Whitehouse void *kaddr; 467b1e71b06SSteven Whitehouse int error; 468b1e71b06SSteven Whitehouse 469b1e71b06SSteven Whitehouse /* 470b1e71b06SSteven Whitehouse * Due to the order of unstuffing files and ->fault(), we can be 471b1e71b06SSteven Whitehouse * asked for a zero page in the case of a stuffed file being extended, 472b1e71b06SSteven Whitehouse * so we need to supply one here. It doesn't happen often. 473b1e71b06SSteven Whitehouse */ 474b1e71b06SSteven Whitehouse if (unlikely(page->index)) { 47509cbfeafSKirill A. Shutemov zero_user(page, 0, PAGE_SIZE); 476b1e71b06SSteven Whitehouse SetPageUptodate(page); 477b1e71b06SSteven Whitehouse return 0; 478b1e71b06SSteven Whitehouse } 479b1e71b06SSteven Whitehouse 480b1e71b06SSteven Whitehouse error = gfs2_meta_inode_buffer(ip, &dibh); 481b1e71b06SSteven Whitehouse if (error) 482b1e71b06SSteven Whitehouse return error; 483b1e71b06SSteven Whitehouse 484d9349285SCong Wang kaddr = kmap_atomic(page); 485602c89d2SSteven Whitehouse if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode))) 486602c89d2SSteven Whitehouse dsize = (dibh->b_size - sizeof(struct gfs2_dinode)); 487602c89d2SSteven Whitehouse memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); 48809cbfeafSKirill A. Shutemov memset(kaddr + dsize, 0, PAGE_SIZE - dsize); 489d9349285SCong Wang kunmap_atomic(kaddr); 490b1e71b06SSteven Whitehouse flush_dcache_page(page); 491b1e71b06SSteven Whitehouse brelse(dibh); 492b1e71b06SSteven Whitehouse SetPageUptodate(page); 493b1e71b06SSteven Whitehouse 494b1e71b06SSteven Whitehouse return 0; 495b1e71b06SSteven Whitehouse } 496b1e71b06SSteven Whitehouse 497b1e71b06SSteven Whitehouse 498b1e71b06SSteven Whitehouse /** 499b1e71b06SSteven Whitehouse * __gfs2_readpage - readpage 500b1e71b06SSteven Whitehouse * @file: The file to read a page for 501b1e71b06SSteven Whitehouse * @page: The page to read 502b1e71b06SSteven Whitehouse * 5039db115a0SAndreas Gruenbacher * This is the core of gfs2's readpage. It's used by the internal file 5049db115a0SAndreas Gruenbacher * reading code as in that case we already hold the glock. Also it's 505b1e71b06SSteven Whitehouse * called by gfs2_readpage() once the required lock has been granted. 506b1e71b06SSteven Whitehouse */ 507b1e71b06SSteven Whitehouse 508b1e71b06SSteven Whitehouse static int __gfs2_readpage(void *file, struct page *page) 509b1e71b06SSteven Whitehouse { 510b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(page->mapping->host); 511b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 512b1e71b06SSteven Whitehouse int error; 513b1e71b06SSteven Whitehouse 514b1e71b06SSteven Whitehouse 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 521b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &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); 638b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 639b1e71b06SSteven Whitehouse ret = -EIO; 640b1e71b06SSteven Whitehouse return ret; 641b1e71b06SSteven Whitehouse } 642b1e71b06SSteven Whitehouse 643b1e71b06SSteven Whitehouse /** 644b1e71b06SSteven Whitehouse * gfs2_write_begin - Begin to write to a file 645b1e71b06SSteven Whitehouse * @file: The file to write to 646b1e71b06SSteven Whitehouse * @mapping: The mapping in which to write 647b1e71b06SSteven Whitehouse * @pos: The file offset at which to start writing 648b1e71b06SSteven Whitehouse * @len: Length of the write 649b1e71b06SSteven Whitehouse * @flags: Various flags 650b1e71b06SSteven Whitehouse * @pagep: Pointer to return the page 651b1e71b06SSteven Whitehouse * @fsdata: Pointer to return fs data (unused by GFS2) 652b1e71b06SSteven Whitehouse * 653b1e71b06SSteven Whitehouse * Returns: errno 654b1e71b06SSteven Whitehouse */ 655b1e71b06SSteven Whitehouse 656b1e71b06SSteven Whitehouse static int gfs2_write_begin(struct file *file, struct address_space *mapping, 657b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned flags, 658b1e71b06SSteven Whitehouse struct page **pagep, void **fsdata) 659b1e71b06SSteven Whitehouse { 660b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 661b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 6621946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 663b1e71b06SSteven Whitehouse unsigned int data_blocks = 0, ind_blocks = 0, rblocks; 66471f890f7SSteven Whitehouse unsigned requested = 0; 665b1e71b06SSteven Whitehouse int alloc_required; 666b1e71b06SSteven Whitehouse int error = 0; 66709cbfeafSKirill A. Shutemov pgoff_t index = pos >> PAGE_SHIFT; 66809cbfeafSKirill A. Shutemov unsigned from = pos & (PAGE_SIZE - 1); 669b1e71b06SSteven Whitehouse struct page *page; 670b1e71b06SSteven Whitehouse 671b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); 672b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&ip->i_gh); 673b1e71b06SSteven Whitehouse if (unlikely(error)) 674b1e71b06SSteven Whitehouse goto out_uninit; 6751946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 6761946f70aSBenjamin Marzinski error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 6771946f70aSBenjamin Marzinski GL_NOCACHE, &m_ip->i_gh); 6781946f70aSBenjamin Marzinski if (unlikely(error)) { 6791946f70aSBenjamin Marzinski gfs2_glock_dq(&ip->i_gh); 6801946f70aSBenjamin Marzinski goto out_uninit; 6811946f70aSBenjamin Marzinski } 6821946f70aSBenjamin Marzinski } 683b1e71b06SSteven Whitehouse 684461cb419SBob Peterson alloc_required = gfs2_write_alloc_required(ip, pos, len); 685b1e71b06SSteven Whitehouse 686b1e71b06SSteven Whitehouse if (alloc_required || gfs2_is_jdata(ip)) 687b1e71b06SSteven Whitehouse gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); 688b1e71b06SSteven Whitehouse 689b1e71b06SSteven Whitehouse if (alloc_required) { 6907b9cff46SSteven Whitehouse struct gfs2_alloc_parms ap = { .aflags = 0, }; 691b8fbf471SAbhi Das requested = data_blocks + ind_blocks; 692b8fbf471SAbhi Das ap.target = requested; 693b8fbf471SAbhi Das error = gfs2_quota_lock_check(ip, &ap); 694b1e71b06SSteven Whitehouse if (error) 6955407e242SBob Peterson goto out_unlock; 696b1e71b06SSteven Whitehouse 6977b9cff46SSteven Whitehouse error = gfs2_inplace_reserve(ip, &ap); 698b1e71b06SSteven Whitehouse if (error) 699b1e71b06SSteven Whitehouse goto out_qunlock; 700b1e71b06SSteven Whitehouse } 701b1e71b06SSteven Whitehouse 702b1e71b06SSteven Whitehouse rblocks = RES_DINODE + ind_blocks; 703b1e71b06SSteven Whitehouse if (gfs2_is_jdata(ip)) 704b1e71b06SSteven Whitehouse rblocks += data_blocks ? data_blocks : 1; 705b1e71b06SSteven Whitehouse if (ind_blocks || data_blocks) 706b1e71b06SSteven Whitehouse rblocks += RES_STATFS + RES_QUOTA; 7071946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) 7081946f70aSBenjamin Marzinski rblocks += 2 * RES_STATFS; 709bf97b673SBenjamin Marzinski if (alloc_required) 71071f890f7SSteven Whitehouse rblocks += gfs2_rg_blocks(ip, requested); 711b1e71b06SSteven Whitehouse 712b1e71b06SSteven Whitehouse error = gfs2_trans_begin(sdp, rblocks, 71309cbfeafSKirill A. Shutemov PAGE_SIZE/sdp->sd_sb.sb_bsize); 714b1e71b06SSteven Whitehouse if (error) 715b1e71b06SSteven Whitehouse goto out_trans_fail; 716b1e71b06SSteven Whitehouse 717b1e71b06SSteven Whitehouse error = -ENOMEM; 718b1e71b06SSteven Whitehouse flags |= AOP_FLAG_NOFS; 719b1e71b06SSteven Whitehouse page = grab_cache_page_write_begin(mapping, index, flags); 720b1e71b06SSteven Whitehouse *pagep = page; 721b1e71b06SSteven Whitehouse if (unlikely(!page)) 722b1e71b06SSteven Whitehouse goto out_endtrans; 723b1e71b06SSteven Whitehouse 724b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 725b1e71b06SSteven Whitehouse error = 0; 726b1e71b06SSteven Whitehouse if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { 727b1e71b06SSteven Whitehouse error = gfs2_unstuff_dinode(ip, page); 728b1e71b06SSteven Whitehouse if (error == 0) 729b1e71b06SSteven Whitehouse goto prepare_write; 730b1e71b06SSteven Whitehouse } else if (!PageUptodate(page)) { 731b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 732b1e71b06SSteven Whitehouse } 733b1e71b06SSteven Whitehouse goto out; 734b1e71b06SSteven Whitehouse } 735b1e71b06SSteven Whitehouse 736b1e71b06SSteven Whitehouse prepare_write: 737ebdec241SChristoph Hellwig error = __block_write_begin(page, from, len, gfs2_block_map); 738b1e71b06SSteven Whitehouse out: 739b1e71b06SSteven Whitehouse if (error == 0) 740b1e71b06SSteven Whitehouse return 0; 741b1e71b06SSteven Whitehouse 7426c474f7bSMaxim unlock_page(page); 74309cbfeafSKirill A. Shutemov put_page(page); 74415c6fd97Snpiggin@suse.de 745ff8f33c8SSteven Whitehouse gfs2_trans_end(sdp); 746b1e71b06SSteven Whitehouse if (pos + len > ip->i_inode.i_size) 747ff8f33c8SSteven Whitehouse gfs2_trim_blocks(&ip->i_inode); 748ff8f33c8SSteven Whitehouse goto out_trans_fail; 749ff8f33c8SSteven Whitehouse 750b1e71b06SSteven Whitehouse out_endtrans: 751b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 752b1e71b06SSteven Whitehouse out_trans_fail: 753b1e71b06SSteven Whitehouse if (alloc_required) { 754b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 755b1e71b06SSteven Whitehouse out_qunlock: 756b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 757b1e71b06SSteven Whitehouse } 758b1e71b06SSteven Whitehouse out_unlock: 7591946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 7601946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 7611946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 7621946f70aSBenjamin Marzinski } 763b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 764b1e71b06SSteven Whitehouse out_uninit: 765b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 766b1e71b06SSteven Whitehouse return error; 767b1e71b06SSteven Whitehouse } 768b1e71b06SSteven Whitehouse 769b1e71b06SSteven Whitehouse /** 770b1e71b06SSteven Whitehouse * adjust_fs_space - Adjusts the free space available due to gfs2_grow 771b1e71b06SSteven Whitehouse * @inode: the rindex inode 772b1e71b06SSteven Whitehouse */ 773b1e71b06SSteven Whitehouse static void adjust_fs_space(struct inode *inode) 774b1e71b06SSteven Whitehouse { 775b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; 7761946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 7771946f70aSBenjamin Marzinski struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 778b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 779b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 7801946f70aSBenjamin Marzinski struct buffer_head *m_bh, *l_bh; 781b1e71b06SSteven Whitehouse u64 fs_total, new_free; 782b1e71b06SSteven Whitehouse 783b1e71b06SSteven Whitehouse /* Total up the file system space, according to the latest rindex. */ 784b1e71b06SSteven Whitehouse fs_total = gfs2_ri_total(sdp); 7851946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) 7861946f70aSBenjamin Marzinski return; 787b1e71b06SSteven Whitehouse 788b1e71b06SSteven Whitehouse spin_lock(&sdp->sd_statfs_spin); 7891946f70aSBenjamin Marzinski gfs2_statfs_change_in(m_sc, m_bh->b_data + 7901946f70aSBenjamin Marzinski sizeof(struct gfs2_dinode)); 791b1e71b06SSteven Whitehouse if (fs_total > (m_sc->sc_total + l_sc->sc_total)) 792b1e71b06SSteven Whitehouse new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); 793b1e71b06SSteven Whitehouse else 794b1e71b06SSteven Whitehouse new_free = 0; 795b1e71b06SSteven Whitehouse spin_unlock(&sdp->sd_statfs_spin); 796b1e71b06SSteven Whitehouse fs_warn(sdp, "File system extended by %llu blocks.\n", 797b1e71b06SSteven Whitehouse (unsigned long long)new_free); 798b1e71b06SSteven Whitehouse gfs2_statfs_change(sdp, new_free, new_free, 0); 7991946f70aSBenjamin Marzinski 8001946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) 8011946f70aSBenjamin Marzinski goto out; 8021946f70aSBenjamin Marzinski update_statfs(sdp, m_bh, l_bh); 8031946f70aSBenjamin Marzinski brelse(l_bh); 8041946f70aSBenjamin Marzinski out: 8051946f70aSBenjamin Marzinski brelse(m_bh); 806b1e71b06SSteven Whitehouse } 807b1e71b06SSteven Whitehouse 808b1e71b06SSteven Whitehouse /** 809b1e71b06SSteven Whitehouse * gfs2_stuffed_write_end - Write end for stuffed files 810b1e71b06SSteven Whitehouse * @inode: The inode 811b1e71b06SSteven Whitehouse * @dibh: The buffer_head containing the on-disk inode 812b1e71b06SSteven Whitehouse * @pos: The file position 813b1e71b06SSteven Whitehouse * @len: The length of the write 814b1e71b06SSteven Whitehouse * @copied: How much was actually copied by the VFS 815b1e71b06SSteven Whitehouse * @page: The page 816b1e71b06SSteven Whitehouse * 817b1e71b06SSteven Whitehouse * This copies the data from the page into the inode block after 818b1e71b06SSteven Whitehouse * the inode data structure itself. 819b1e71b06SSteven Whitehouse * 820b1e71b06SSteven Whitehouse * Returns: errno 821b1e71b06SSteven Whitehouse */ 822b1e71b06SSteven Whitehouse static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, 823b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 824b1e71b06SSteven Whitehouse struct page *page) 825b1e71b06SSteven Whitehouse { 826b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 827b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 8281946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 829b1e71b06SSteven Whitehouse u64 to = pos + copied; 830b1e71b06SSteven Whitehouse void *kaddr; 831b1e71b06SSteven Whitehouse unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); 832b1e71b06SSteven Whitehouse 833b1e71b06SSteven Whitehouse BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode))); 834d9349285SCong Wang kaddr = kmap_atomic(page); 835b1e71b06SSteven Whitehouse memcpy(buf + pos, kaddr + pos, copied); 836b1e71b06SSteven Whitehouse flush_dcache_page(page); 837d9349285SCong Wang kunmap_atomic(kaddr); 838b1e71b06SSteven Whitehouse 83943388b21SAl Viro WARN_ON(!PageUptodate(page)); 840b1e71b06SSteven Whitehouse unlock_page(page); 84109cbfeafSKirill A. Shutemov put_page(page); 842b1e71b06SSteven Whitehouse 843b1e71b06SSteven Whitehouse if (copied) { 844a2e0f799SSteven Whitehouse if (inode->i_size < to) 845b1e71b06SSteven Whitehouse i_size_write(inode, to); 846b1e71b06SSteven Whitehouse mark_inode_dirty(inode); 847b1e71b06SSteven Whitehouse } 848b1e71b06SSteven Whitehouse 8499ae3c6deSBenjamin Marzinski if (inode == sdp->sd_rindex) { 850b1e71b06SSteven Whitehouse adjust_fs_space(inode); 851ca9248d8SBob Peterson sdp->sd_rindex_uptodate = 0; 8529ae3c6deSBenjamin Marzinski } 853b1e71b06SSteven Whitehouse 854b1e71b06SSteven Whitehouse brelse(dibh); 855b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 8561946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 8571946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 8581946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 8591946f70aSBenjamin Marzinski } 860b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 861b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 862b1e71b06SSteven Whitehouse return copied; 863b1e71b06SSteven Whitehouse } 864b1e71b06SSteven Whitehouse 865b1e71b06SSteven Whitehouse /** 866b1e71b06SSteven Whitehouse * gfs2_write_end 867b1e71b06SSteven Whitehouse * @file: The file to write to 868b1e71b06SSteven Whitehouse * @mapping: The address space to write to 869b1e71b06SSteven Whitehouse * @pos: The file position 870b1e71b06SSteven Whitehouse * @len: The length of the data 8711272574bSFabian Frederick * @copied: How much was actually copied by the VFS 872b1e71b06SSteven Whitehouse * @page: The page that has been written 873b1e71b06SSteven Whitehouse * @fsdata: The fsdata (unused in GFS2) 874b1e71b06SSteven Whitehouse * 875b1e71b06SSteven Whitehouse * The main write_end function for GFS2. We have a separate one for 876b1e71b06SSteven Whitehouse * stuffed files as they are slightly different, otherwise we just 877b1e71b06SSteven Whitehouse * put our locking around the VFS provided functions. 878b1e71b06SSteven Whitehouse * 879b1e71b06SSteven Whitehouse * Returns: errno 880b1e71b06SSteven Whitehouse */ 881b1e71b06SSteven Whitehouse 882b1e71b06SSteven Whitehouse static int gfs2_write_end(struct file *file, struct address_space *mapping, 883b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 884b1e71b06SSteven Whitehouse struct page *page, void *fsdata) 885b1e71b06SSteven Whitehouse { 886b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 887b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 888b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 8891946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 890b1e71b06SSteven Whitehouse struct buffer_head *dibh; 89109cbfeafSKirill A. Shutemov unsigned int from = pos & (PAGE_SIZE - 1); 892b1e71b06SSteven Whitehouse unsigned int to = from + len; 893b1e71b06SSteven Whitehouse int ret; 8940c901809SBenjamin Marzinski struct gfs2_trans *tr = current->journal_info; 8950c901809SBenjamin Marzinski BUG_ON(!tr); 896b1e71b06SSteven Whitehouse 897b1e71b06SSteven Whitehouse BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); 898b1e71b06SSteven Whitehouse 899b1e71b06SSteven Whitehouse ret = gfs2_meta_inode_buffer(ip, &dibh); 900b1e71b06SSteven Whitehouse if (unlikely(ret)) { 901b1e71b06SSteven Whitehouse unlock_page(page); 90209cbfeafSKirill A. Shutemov put_page(page); 903b1e71b06SSteven Whitehouse goto failed; 904b1e71b06SSteven Whitehouse } 905b1e71b06SSteven Whitehouse 906b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 907b1e71b06SSteven Whitehouse return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); 908b1e71b06SSteven Whitehouse 909b1e71b06SSteven Whitehouse if (!gfs2_is_writeback(ip)) 910b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, from, to); 911b1e71b06SSteven Whitehouse 912b1e71b06SSteven Whitehouse ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); 9130c901809SBenjamin Marzinski if (tr->tr_num_buf_new) 9140c901809SBenjamin Marzinski __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 9150c901809SBenjamin Marzinski else 9160c901809SBenjamin Marzinski gfs2_trans_add_meta(ip->i_gl, dibh); 9170c901809SBenjamin Marzinski 918b1e71b06SSteven Whitehouse 9199ae3c6deSBenjamin Marzinski if (inode == sdp->sd_rindex) { 920b1e71b06SSteven Whitehouse adjust_fs_space(inode); 921ca9248d8SBob Peterson sdp->sd_rindex_uptodate = 0; 9229ae3c6deSBenjamin Marzinski } 923b1e71b06SSteven Whitehouse 924b1e71b06SSteven Whitehouse brelse(dibh); 925b1e71b06SSteven Whitehouse failed: 926deab72d3SBob Peterson gfs2_trans_end(sdp); 927b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 928b54e9a0bSBob Peterson if (ip->i_qadata && ip->i_qadata->qa_qd_num) 929b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 9301946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 9311946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 9321946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 9331946f70aSBenjamin Marzinski } 934b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 935b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 936b1e71b06SSteven Whitehouse return ret; 937b1e71b06SSteven Whitehouse } 938b1e71b06SSteven Whitehouse 939b1e71b06SSteven Whitehouse /** 940b1e71b06SSteven Whitehouse * gfs2_set_page_dirty - Page dirtying function 941b1e71b06SSteven Whitehouse * @page: The page to dirty 942b1e71b06SSteven Whitehouse * 943b1e71b06SSteven Whitehouse * Returns: 1 if it dirtyed the page, or 0 otherwise 944b1e71b06SSteven Whitehouse */ 945b1e71b06SSteven Whitehouse 946b1e71b06SSteven Whitehouse static int gfs2_set_page_dirty(struct page *page) 947b1e71b06SSteven Whitehouse { 948b1e71b06SSteven Whitehouse SetPageChecked(page); 949b1e71b06SSteven Whitehouse return __set_page_dirty_buffers(page); 950b1e71b06SSteven Whitehouse } 951b1e71b06SSteven Whitehouse 952b1e71b06SSteven Whitehouse /** 953b1e71b06SSteven Whitehouse * gfs2_bmap - Block map function 954b1e71b06SSteven Whitehouse * @mapping: Address space info 955b1e71b06SSteven Whitehouse * @lblock: The block to map 956b1e71b06SSteven Whitehouse * 957b1e71b06SSteven Whitehouse * Returns: The disk address for the block or 0 on hole or error 958b1e71b06SSteven Whitehouse */ 959b1e71b06SSteven Whitehouse 960b1e71b06SSteven Whitehouse static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) 961b1e71b06SSteven Whitehouse { 962b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 963b1e71b06SSteven Whitehouse struct gfs2_holder i_gh; 964b1e71b06SSteven Whitehouse sector_t dblock = 0; 965b1e71b06SSteven Whitehouse int error; 966b1e71b06SSteven Whitehouse 967b1e71b06SSteven Whitehouse error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 968b1e71b06SSteven Whitehouse if (error) 969b1e71b06SSteven Whitehouse return 0; 970b1e71b06SSteven Whitehouse 971b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 972b1e71b06SSteven Whitehouse dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); 973b1e71b06SSteven Whitehouse 974b1e71b06SSteven Whitehouse gfs2_glock_dq_uninit(&i_gh); 975b1e71b06SSteven Whitehouse 976b1e71b06SSteven Whitehouse return dblock; 977b1e71b06SSteven Whitehouse } 978b1e71b06SSteven Whitehouse 979b1e71b06SSteven Whitehouse static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) 980b1e71b06SSteven Whitehouse { 981b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 982b1e71b06SSteven Whitehouse 983b1e71b06SSteven Whitehouse lock_buffer(bh); 984b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 985b1e71b06SSteven Whitehouse clear_buffer_dirty(bh); 986b1e71b06SSteven Whitehouse bd = bh->b_private; 987b1e71b06SSteven Whitehouse if (bd) { 988c0752aa7SBob Peterson if (!list_empty(&bd->bd_list) && !buffer_pinned(bh)) 989c0752aa7SBob Peterson list_del_init(&bd->bd_list); 990b1e71b06SSteven Whitehouse else 99168cd4ce2SBob Peterson gfs2_remove_from_journal(bh, REMOVE_JDATA); 992b1e71b06SSteven Whitehouse } 993b1e71b06SSteven Whitehouse bh->b_bdev = NULL; 994b1e71b06SSteven Whitehouse clear_buffer_mapped(bh); 995b1e71b06SSteven Whitehouse clear_buffer_req(bh); 996b1e71b06SSteven Whitehouse clear_buffer_new(bh); 997b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 998b1e71b06SSteven Whitehouse unlock_buffer(bh); 999b1e71b06SSteven Whitehouse } 1000b1e71b06SSteven Whitehouse 1001d47992f8SLukas Czerner static void gfs2_invalidatepage(struct page *page, unsigned int offset, 1002d47992f8SLukas Czerner unsigned int length) 1003b1e71b06SSteven Whitehouse { 1004b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 10055c0bb97cSLukas Czerner unsigned int stop = offset + length; 100609cbfeafSKirill A. Shutemov int partial_page = (offset || length < PAGE_SIZE); 1007b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 1008b1e71b06SSteven Whitehouse unsigned long pos = 0; 1009b1e71b06SSteven Whitehouse 1010b1e71b06SSteven Whitehouse BUG_ON(!PageLocked(page)); 10115c0bb97cSLukas Czerner if (!partial_page) 1012b1e71b06SSteven Whitehouse ClearPageChecked(page); 1013b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 1014b1e71b06SSteven Whitehouse goto out; 1015b1e71b06SSteven Whitehouse 1016b1e71b06SSteven Whitehouse bh = head = page_buffers(page); 1017b1e71b06SSteven Whitehouse do { 10185c0bb97cSLukas Czerner if (pos + bh->b_size > stop) 10195c0bb97cSLukas Czerner return; 10205c0bb97cSLukas Czerner 1021b1e71b06SSteven Whitehouse if (offset <= pos) 1022b1e71b06SSteven Whitehouse gfs2_discard(sdp, bh); 1023b1e71b06SSteven Whitehouse pos += bh->b_size; 1024b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1025b1e71b06SSteven Whitehouse } while (bh != head); 1026b1e71b06SSteven Whitehouse out: 10275c0bb97cSLukas Czerner if (!partial_page) 1028b1e71b06SSteven Whitehouse try_to_release_page(page, 0); 1029b1e71b06SSteven Whitehouse } 1030b1e71b06SSteven Whitehouse 1031b1e71b06SSteven Whitehouse /** 1032b1e71b06SSteven Whitehouse * gfs2_ok_for_dio - check that dio is valid on this file 1033b1e71b06SSteven Whitehouse * @ip: The inode 1034b1e71b06SSteven Whitehouse * @offset: The offset at which we are reading or writing 1035b1e71b06SSteven Whitehouse * 1036b1e71b06SSteven Whitehouse * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) 1037b1e71b06SSteven Whitehouse * 1 (to accept the i/o request) 1038b1e71b06SSteven Whitehouse */ 10396f673763SOmar Sandoval static int gfs2_ok_for_dio(struct gfs2_inode *ip, loff_t offset) 1040b1e71b06SSteven Whitehouse { 1041b1e71b06SSteven Whitehouse /* 1042b1e71b06SSteven Whitehouse * Should we return an error here? I can't see that O_DIRECT for 1043b1e71b06SSteven Whitehouse * a stuffed file makes any sense. For now we'll silently fall 1044b1e71b06SSteven Whitehouse * back to buffered I/O 1045b1e71b06SSteven Whitehouse */ 1046b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 1047b1e71b06SSteven Whitehouse return 0; 1048b1e71b06SSteven Whitehouse 1049b1e71b06SSteven Whitehouse if (offset >= i_size_read(&ip->i_inode)) 1050b1e71b06SSteven Whitehouse return 0; 1051b1e71b06SSteven Whitehouse return 1; 1052b1e71b06SSteven Whitehouse } 1053b1e71b06SSteven Whitehouse 1054b1e71b06SSteven Whitehouse 1055b1e71b06SSteven Whitehouse 1056c8b8e32dSChristoph Hellwig static ssize_t gfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 1057b1e71b06SSteven Whitehouse { 1058b1e71b06SSteven Whitehouse struct file *file = iocb->ki_filp; 1059b1e71b06SSteven Whitehouse struct inode *inode = file->f_mapping->host; 1060dfd11184SSteven Whitehouse struct address_space *mapping = inode->i_mapping; 1061b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1062c8b8e32dSChristoph Hellwig loff_t offset = iocb->ki_pos; 1063b1e71b06SSteven Whitehouse struct gfs2_holder gh; 1064b1e71b06SSteven Whitehouse int rv; 1065b1e71b06SSteven Whitehouse 1066b1e71b06SSteven Whitehouse /* 1067b1e71b06SSteven Whitehouse * Deferred lock, even if its a write, since we do no allocation 1068b1e71b06SSteven Whitehouse * on this path. All we need change is atime, and this lock mode 1069b1e71b06SSteven Whitehouse * ensures that other nodes have flushed their buffered read caches 1070b1e71b06SSteven Whitehouse * (i.e. their page cache entries for this inode). We do not, 1071b1e71b06SSteven Whitehouse * unfortunately have the option of only flushing a range like 1072b1e71b06SSteven Whitehouse * the VFS does. 1073b1e71b06SSteven Whitehouse */ 1074b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); 1075b1e71b06SSteven Whitehouse rv = gfs2_glock_nq(&gh); 1076b1e71b06SSteven Whitehouse if (rv) 10779c7fe835SDaniel DeFreez goto out_uninit; 10786f673763SOmar Sandoval rv = gfs2_ok_for_dio(ip, offset); 1079b1e71b06SSteven Whitehouse if (rv != 1) 1080b1e71b06SSteven Whitehouse goto out; /* dio not valid, fall back to buffered i/o */ 1081b1e71b06SSteven Whitehouse 1082dfd11184SSteven Whitehouse /* 1083dfd11184SSteven Whitehouse * Now since we are holding a deferred (CW) lock at this point, you 1084dfd11184SSteven Whitehouse * might be wondering why this is ever needed. There is a case however 1085dfd11184SSteven Whitehouse * where we've granted a deferred local lock against a cached exclusive 1086dfd11184SSteven Whitehouse * glock. That is ok provided all granted local locks are deferred, but 1087dfd11184SSteven Whitehouse * it also means that it is possible to encounter pages which are 1088dfd11184SSteven Whitehouse * cached and possibly also mapped. So here we check for that and sort 1089dfd11184SSteven Whitehouse * them out ahead of the dio. The glock state machine will take care of 1090dfd11184SSteven Whitehouse * everything else. 1091dfd11184SSteven Whitehouse * 1092dfd11184SSteven Whitehouse * If in fact the cached glock state (gl->gl_state) is deferred (CW) in 1093dfd11184SSteven Whitehouse * the first place, mapping->nr_pages will always be zero. 1094dfd11184SSteven Whitehouse */ 1095dfd11184SSteven Whitehouse if (mapping->nrpages) { 109609cbfeafSKirill A. Shutemov loff_t lstart = offset & ~(PAGE_SIZE - 1); 1097a6cbcd4aSAl Viro loff_t len = iov_iter_count(iter); 1098dfd11184SSteven Whitehouse loff_t end = PAGE_ALIGN(offset + len) - 1; 1099dfd11184SSteven Whitehouse 1100dfd11184SSteven Whitehouse rv = 0; 1101dfd11184SSteven Whitehouse if (len == 0) 1102dfd11184SSteven Whitehouse goto out; 1103dfd11184SSteven Whitehouse if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags)) 1104dfd11184SSteven Whitehouse unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len); 1105dfd11184SSteven Whitehouse rv = filemap_write_and_wait_range(mapping, lstart, end); 1106dfd11184SSteven Whitehouse if (rv) 1107086352f1SSteven Whitehouse goto out; 11086f673763SOmar Sandoval if (iov_iter_rw(iter) == WRITE) 1109dfd11184SSteven Whitehouse truncate_inode_pages_range(mapping, lstart, end); 1110dfd11184SSteven Whitehouse } 1111dfd11184SSteven Whitehouse 111217f8c842SOmar Sandoval rv = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, 1113c8b8e32dSChristoph Hellwig gfs2_get_block_direct, NULL, NULL, 0); 1114b1e71b06SSteven Whitehouse out: 11158e711e10SBob Peterson gfs2_glock_dq(&gh); 11169c7fe835SDaniel DeFreez out_uninit: 1117b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 1118b1e71b06SSteven Whitehouse return rv; 1119b1e71b06SSteven Whitehouse } 1120b1e71b06SSteven Whitehouse 1121b1e71b06SSteven Whitehouse /** 1122b1e71b06SSteven Whitehouse * gfs2_releasepage - free the metadata associated with a page 1123b1e71b06SSteven Whitehouse * @page: the page that's being released 1124b1e71b06SSteven Whitehouse * @gfp_mask: passed from Linux VFS, ignored by us 1125b1e71b06SSteven Whitehouse * 1126b1e71b06SSteven Whitehouse * Call try_to_free_buffers() if the buffers in this page can be 1127b1e71b06SSteven Whitehouse * released. 1128b1e71b06SSteven Whitehouse * 1129b1e71b06SSteven Whitehouse * Returns: 0 1130b1e71b06SSteven Whitehouse */ 1131b1e71b06SSteven Whitehouse 1132b1e71b06SSteven Whitehouse int gfs2_releasepage(struct page *page, gfp_t gfp_mask) 1133b1e71b06SSteven Whitehouse { 1134009d8518SSteven Whitehouse struct address_space *mapping = page->mapping; 1135009d8518SSteven Whitehouse struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 1136b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 1137b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 1138b1e71b06SSteven Whitehouse 1139b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 1140b1e71b06SSteven Whitehouse return 0; 1141b1e71b06SSteven Whitehouse 11421c185c02SAndreas Gruenbacher /* 11431c185c02SAndreas Gruenbacher * From xfs_vm_releasepage: mm accommodates an old ext3 case where 11441c185c02SAndreas Gruenbacher * clean pages might not have had the dirty bit cleared. Thus, it can 11451c185c02SAndreas Gruenbacher * send actual dirty pages to ->releasepage() via shrink_active_list(). 11461c185c02SAndreas Gruenbacher * 11471c185c02SAndreas Gruenbacher * As a workaround, we skip pages that contain dirty buffers below. 11481c185c02SAndreas Gruenbacher * Once ->releasepage isn't called on dirty pages anymore, we can warn 11491c185c02SAndreas Gruenbacher * on dirty buffers like we used to here again. 11501c185c02SAndreas Gruenbacher */ 11511c185c02SAndreas Gruenbacher 1152b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 1153380f7c65SSteven Whitehouse spin_lock(&sdp->sd_ail_lock); 1154b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1155b1e71b06SSteven Whitehouse do { 1156b1e71b06SSteven Whitehouse if (atomic_read(&bh->b_count)) 1157b1e71b06SSteven Whitehouse goto cannot_release; 1158b1e71b06SSteven Whitehouse bd = bh->b_private; 115916ca9412SBenjamin Marzinski if (bd && bd->bd_tr) 1160b1e71b06SSteven Whitehouse goto cannot_release; 11611c185c02SAndreas Gruenbacher if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh))) 11621c185c02SAndreas Gruenbacher goto cannot_release; 1163b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1164b1e71b06SSteven Whitehouse } while(bh != head); 1165380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 1166b1e71b06SSteven Whitehouse 1167b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1168b1e71b06SSteven Whitehouse do { 1169b1e71b06SSteven Whitehouse bd = bh->b_private; 1170b1e71b06SSteven Whitehouse if (bd) { 1171b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, bd->bd_bh == bh); 1172e4f29206SSteven Whitehouse if (!list_empty(&bd->bd_list)) 1173c0752aa7SBob Peterson list_del_init(&bd->bd_list); 1174b1e71b06SSteven Whitehouse bd->bd_bh = NULL; 1175b1e71b06SSteven Whitehouse bh->b_private = NULL; 1176b1e71b06SSteven Whitehouse kmem_cache_free(gfs2_bufdata_cachep, bd); 1177e4f29206SSteven Whitehouse } 1178b1e71b06SSteven Whitehouse 1179b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1180b1e71b06SSteven Whitehouse } while (bh != head); 1181e4f29206SSteven Whitehouse gfs2_log_unlock(sdp); 1182b1e71b06SSteven Whitehouse 1183b1e71b06SSteven Whitehouse return try_to_free_buffers(page); 11848f065d36SSteven Whitehouse 1185b1e71b06SSteven Whitehouse cannot_release: 1186380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 1187b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1188b1e71b06SSteven Whitehouse return 0; 1189b1e71b06SSteven Whitehouse } 1190b1e71b06SSteven Whitehouse 1191b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_writeback_aops = { 11929d358143SSteven Whitehouse .writepage = gfs2_writepage, 119345138990SSteven Whitehouse .writepages = gfs2_writepages, 1194b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1195b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1196b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1197b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1198b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1199b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1200b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1201b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1202b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1203b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1204aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1205b1e71b06SSteven Whitehouse }; 1206b1e71b06SSteven Whitehouse 1207b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_ordered_aops = { 12089d358143SSteven Whitehouse .writepage = gfs2_writepage, 120945138990SSteven Whitehouse .writepages = gfs2_writepages, 1210b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1211b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1212b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1213b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1214b1e71b06SSteven Whitehouse .set_page_dirty = gfs2_set_page_dirty, 1215b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1216b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1217b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1218b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1219b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1220b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1221aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1222b1e71b06SSteven Whitehouse }; 1223b1e71b06SSteven Whitehouse 1224b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_jdata_aops = { 1225b1e71b06SSteven Whitehouse .writepage = gfs2_jdata_writepage, 1226b1e71b06SSteven Whitehouse .writepages = gfs2_jdata_writepages, 1227b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1228b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1229b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1230b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1231b1e71b06SSteven Whitehouse .set_page_dirty = gfs2_set_page_dirty, 1232b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1233b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1234b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1235b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1236aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1237b1e71b06SSteven Whitehouse }; 1238b1e71b06SSteven Whitehouse 1239b1e71b06SSteven Whitehouse void gfs2_set_aops(struct inode *inode) 1240b1e71b06SSteven Whitehouse { 1241b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1242b1e71b06SSteven Whitehouse 1243b1e71b06SSteven Whitehouse if (gfs2_is_writeback(ip)) 1244b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_writeback_aops; 1245b1e71b06SSteven Whitehouse else if (gfs2_is_ordered(ip)) 1246b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_ordered_aops; 1247b1e71b06SSteven Whitehouse else if (gfs2_is_jdata(ip)) 1248b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_jdata_aops; 1249b1e71b06SSteven Whitehouse else 1250b1e71b06SSteven Whitehouse BUG(); 1251b1e71b06SSteven Whitehouse } 1252b1e71b06SSteven Whitehouse 1253