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> 2564bc06bbSAndreas Gruenbacher #include <linux/sched/signal.h> 26b1e71b06SSteven Whitehouse 27b1e71b06SSteven Whitehouse #include "gfs2.h" 28b1e71b06SSteven Whitehouse #include "incore.h" 29b1e71b06SSteven Whitehouse #include "bmap.h" 30b1e71b06SSteven Whitehouse #include "glock.h" 31b1e71b06SSteven Whitehouse #include "inode.h" 32b1e71b06SSteven Whitehouse #include "log.h" 33b1e71b06SSteven Whitehouse #include "meta_io.h" 34b1e71b06SSteven Whitehouse #include "quota.h" 35b1e71b06SSteven Whitehouse #include "trans.h" 36b1e71b06SSteven Whitehouse #include "rgrp.h" 37b1e71b06SSteven Whitehouse #include "super.h" 38b1e71b06SSteven Whitehouse #include "util.h" 39b1e71b06SSteven Whitehouse #include "glops.h" 4064bc06bbSAndreas Gruenbacher #include "aops.h" 41b1e71b06SSteven Whitehouse 42b1e71b06SSteven Whitehouse 4364bc06bbSAndreas Gruenbacher void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, 4488b65ce5SAndreas Gruenbacher unsigned int from, unsigned int len) 45b1e71b06SSteven Whitehouse { 46b1e71b06SSteven Whitehouse struct buffer_head *head = page_buffers(page); 47b1e71b06SSteven Whitehouse unsigned int bsize = head->b_size; 48b1e71b06SSteven Whitehouse struct buffer_head *bh; 4988b65ce5SAndreas Gruenbacher unsigned int to = from + len; 50b1e71b06SSteven Whitehouse unsigned int start, end; 51b1e71b06SSteven Whitehouse 52b1e71b06SSteven Whitehouse for (bh = head, start = 0; bh != head || !start; 53b1e71b06SSteven Whitehouse bh = bh->b_this_page, start = end) { 54b1e71b06SSteven Whitehouse end = start + bsize; 5588b65ce5SAndreas Gruenbacher if (end <= from) 56b1e71b06SSteven Whitehouse continue; 5788b65ce5SAndreas Gruenbacher if (start >= to) 5888b65ce5SAndreas Gruenbacher break; 59b1e71b06SSteven Whitehouse set_buffer_uptodate(bh); 60350a9b0aSSteven Whitehouse gfs2_trans_add_data(ip->i_gl, bh); 61b1e71b06SSteven Whitehouse } 62b1e71b06SSteven Whitehouse } 63b1e71b06SSteven Whitehouse 64b1e71b06SSteven Whitehouse /** 65b1e71b06SSteven Whitehouse * gfs2_get_block_noalloc - Fills in a buffer head with details about a block 66b1e71b06SSteven Whitehouse * @inode: The inode 67b1e71b06SSteven Whitehouse * @lblock: The block number to look up 68b1e71b06SSteven Whitehouse * @bh_result: The buffer head to return the result in 69b1e71b06SSteven Whitehouse * @create: Non-zero if we may add block to the file 70b1e71b06SSteven Whitehouse * 71b1e71b06SSteven Whitehouse * Returns: errno 72b1e71b06SSteven Whitehouse */ 73b1e71b06SSteven Whitehouse 74b1e71b06SSteven Whitehouse static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, 75b1e71b06SSteven Whitehouse struct buffer_head *bh_result, int create) 76b1e71b06SSteven Whitehouse { 77b1e71b06SSteven Whitehouse int error; 78b1e71b06SSteven Whitehouse 79b1e71b06SSteven Whitehouse error = gfs2_block_map(inode, lblock, bh_result, 0); 80b1e71b06SSteven Whitehouse if (error) 81b1e71b06SSteven Whitehouse return error; 82b1e71b06SSteven Whitehouse if (!buffer_mapped(bh_result)) 83b1e71b06SSteven Whitehouse return -EIO; 84b1e71b06SSteven Whitehouse return 0; 85b1e71b06SSteven Whitehouse } 86b1e71b06SSteven Whitehouse 87b1e71b06SSteven Whitehouse static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, 88b1e71b06SSteven Whitehouse struct buffer_head *bh_result, int create) 89b1e71b06SSteven Whitehouse { 90b1e71b06SSteven Whitehouse return gfs2_block_map(inode, lblock, bh_result, 0); 91b1e71b06SSteven Whitehouse } 92b1e71b06SSteven Whitehouse 93b1e71b06SSteven Whitehouse /** 94b1e71b06SSteven Whitehouse * gfs2_writepage_common - Common bits of writepage 95b1e71b06SSteven Whitehouse * @page: The page to be written 96b1e71b06SSteven Whitehouse * @wbc: The writeback control 97b1e71b06SSteven Whitehouse * 98b1e71b06SSteven Whitehouse * Returns: 1 if writepage is ok, otherwise an error code or zero if no error. 99b1e71b06SSteven Whitehouse */ 100b1e71b06SSteven Whitehouse 101b1e71b06SSteven Whitehouse static int gfs2_writepage_common(struct page *page, 102b1e71b06SSteven Whitehouse struct writeback_control *wbc) 103b1e71b06SSteven Whitehouse { 104b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 105b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 106b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 107b1e71b06SSteven Whitehouse loff_t i_size = i_size_read(inode); 10809cbfeafSKirill A. Shutemov pgoff_t end_index = i_size >> PAGE_SHIFT; 109b1e71b06SSteven Whitehouse unsigned offset; 110b1e71b06SSteven Whitehouse 111b1e71b06SSteven Whitehouse if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 112b1e71b06SSteven Whitehouse goto out; 113b1e71b06SSteven Whitehouse if (current->journal_info) 114b1e71b06SSteven Whitehouse goto redirty; 115b1e71b06SSteven Whitehouse /* Is the page fully outside i_size? (truncate in progress) */ 11609cbfeafSKirill A. Shutemov offset = i_size & (PAGE_SIZE-1); 117b1e71b06SSteven Whitehouse if (page->index > end_index || (page->index == end_index && !offset)) { 11809cbfeafSKirill A. Shutemov page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 119b1e71b06SSteven Whitehouse goto out; 120b1e71b06SSteven Whitehouse } 121b1e71b06SSteven Whitehouse return 1; 122b1e71b06SSteven Whitehouse redirty: 123b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 124b1e71b06SSteven Whitehouse out: 125b1e71b06SSteven Whitehouse unlock_page(page); 126b1e71b06SSteven Whitehouse return 0; 127b1e71b06SSteven Whitehouse } 128b1e71b06SSteven Whitehouse 129b1e71b06SSteven Whitehouse /** 1309d358143SSteven Whitehouse * gfs2_writepage - Write page for writeback mappings 131b1e71b06SSteven Whitehouse * @page: The page 132b1e71b06SSteven Whitehouse * @wbc: The writeback control 133b1e71b06SSteven Whitehouse * 134b1e71b06SSteven Whitehouse */ 135b1e71b06SSteven Whitehouse 1369d358143SSteven Whitehouse static int gfs2_writepage(struct page *page, struct writeback_control *wbc) 137b1e71b06SSteven Whitehouse { 138b1e71b06SSteven Whitehouse int ret; 139b1e71b06SSteven Whitehouse 140b1e71b06SSteven Whitehouse ret = gfs2_writepage_common(page, wbc); 141b1e71b06SSteven Whitehouse if (ret <= 0) 142b1e71b06SSteven Whitehouse return ret; 143b1e71b06SSteven Whitehouse 14430116ff6SSteven Whitehouse return nobh_writepage(page, gfs2_get_block_noalloc, wbc); 145b1e71b06SSteven Whitehouse } 146b1e71b06SSteven Whitehouse 147fd4c5748SBenjamin Marzinski /* This is the same as calling block_write_full_page, but it also 148fd4c5748SBenjamin Marzinski * writes pages outside of i_size 149fd4c5748SBenjamin Marzinski */ 150c548a1c1SAndrew Price static int gfs2_write_full_page(struct page *page, get_block_t *get_block, 151fd4c5748SBenjamin Marzinski struct writeback_control *wbc) 152fd4c5748SBenjamin Marzinski { 153fd4c5748SBenjamin Marzinski struct inode * const inode = page->mapping->host; 154fd4c5748SBenjamin Marzinski loff_t i_size = i_size_read(inode); 155fd4c5748SBenjamin Marzinski const pgoff_t end_index = i_size >> PAGE_SHIFT; 156fd4c5748SBenjamin Marzinski unsigned offset; 157fd4c5748SBenjamin Marzinski 158fd4c5748SBenjamin Marzinski /* 159fd4c5748SBenjamin Marzinski * The page straddles i_size. It must be zeroed out on each and every 160fd4c5748SBenjamin Marzinski * writepage invocation because it may be mmapped. "A file is mapped 161fd4c5748SBenjamin Marzinski * in multiples of the page size. For a file that is not a multiple of 162fd4c5748SBenjamin Marzinski * the page size, the remaining memory is zeroed when mapped, and 163fd4c5748SBenjamin Marzinski * writes to that region are not written out to the file." 164fd4c5748SBenjamin Marzinski */ 165fd4c5748SBenjamin Marzinski offset = i_size & (PAGE_SIZE-1); 166fd4c5748SBenjamin Marzinski if (page->index == end_index && offset) 167fd4c5748SBenjamin Marzinski zero_user_segment(page, offset, PAGE_SIZE); 168fd4c5748SBenjamin Marzinski 169fd4c5748SBenjamin Marzinski return __block_write_full_page(inode, page, get_block, wbc, 170fd4c5748SBenjamin Marzinski end_buffer_async_write); 171fd4c5748SBenjamin Marzinski } 172fd4c5748SBenjamin Marzinski 173b1e71b06SSteven Whitehouse /** 174b1e71b06SSteven Whitehouse * __gfs2_jdata_writepage - The core of jdata writepage 175b1e71b06SSteven Whitehouse * @page: The page to write 176b1e71b06SSteven Whitehouse * @wbc: The writeback control 177b1e71b06SSteven Whitehouse * 178b1e71b06SSteven Whitehouse * This is shared between writepage and writepages and implements the 179b1e71b06SSteven Whitehouse * core of the writepage operation. If a transaction is required then 180b1e71b06SSteven Whitehouse * PageChecked will have been set and the transaction will have 181b1e71b06SSteven Whitehouse * already been started before this is called. 182b1e71b06SSteven Whitehouse */ 183b1e71b06SSteven Whitehouse 184b1e71b06SSteven Whitehouse static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 185b1e71b06SSteven Whitehouse { 186b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 187b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 188b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 189b1e71b06SSteven Whitehouse 190b1e71b06SSteven Whitehouse if (PageChecked(page)) { 191b1e71b06SSteven Whitehouse ClearPageChecked(page); 192b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) { 193b1e71b06SSteven Whitehouse create_empty_buffers(page, inode->i_sb->s_blocksize, 19447a9a527SFabian Frederick BIT(BH_Dirty)|BIT(BH_Uptodate)); 195b1e71b06SSteven Whitehouse } 19688b65ce5SAndreas Gruenbacher gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize); 197b1e71b06SSteven Whitehouse } 198fd4c5748SBenjamin Marzinski return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc); 199b1e71b06SSteven Whitehouse } 200b1e71b06SSteven Whitehouse 201b1e71b06SSteven Whitehouse /** 202b1e71b06SSteven Whitehouse * gfs2_jdata_writepage - Write complete page 203b1e71b06SSteven Whitehouse * @page: Page to write 2041272574bSFabian Frederick * @wbc: The writeback control 205b1e71b06SSteven Whitehouse * 206b1e71b06SSteven Whitehouse * Returns: errno 207b1e71b06SSteven Whitehouse * 208b1e71b06SSteven Whitehouse */ 209b1e71b06SSteven Whitehouse 210b1e71b06SSteven Whitehouse static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 211b1e71b06SSteven Whitehouse { 212b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 213fd4c5748SBenjamin Marzinski struct gfs2_inode *ip = GFS2_I(inode); 214b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 215b1e71b06SSteven Whitehouse int ret; 216b1e71b06SSteven Whitehouse 217fd4c5748SBenjamin Marzinski if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 218fd4c5748SBenjamin Marzinski goto out; 219fd4c5748SBenjamin Marzinski if (PageChecked(page) || current->journal_info) 220b1e71b06SSteven Whitehouse goto out_ignore; 221b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 222b1e71b06SSteven Whitehouse return ret; 223b1e71b06SSteven Whitehouse 224b1e71b06SSteven Whitehouse out_ignore: 225b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 226fd4c5748SBenjamin Marzinski out: 227b1e71b06SSteven Whitehouse unlock_page(page); 228b1e71b06SSteven Whitehouse return 0; 229b1e71b06SSteven Whitehouse } 230b1e71b06SSteven Whitehouse 231b1e71b06SSteven Whitehouse /** 23245138990SSteven Whitehouse * gfs2_writepages - Write a bunch of dirty pages back to disk 233b1e71b06SSteven Whitehouse * @mapping: The mapping to write 234b1e71b06SSteven Whitehouse * @wbc: Write-back control 235b1e71b06SSteven Whitehouse * 23645138990SSteven Whitehouse * Used for both ordered and writeback modes. 237b1e71b06SSteven Whitehouse */ 23845138990SSteven Whitehouse static int gfs2_writepages(struct address_space *mapping, 239b1e71b06SSteven Whitehouse struct writeback_control *wbc) 240b1e71b06SSteven Whitehouse { 241b066a4eeSAbhi Das struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 242b066a4eeSAbhi Das int ret = mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); 243b066a4eeSAbhi Das 244b066a4eeSAbhi Das /* 245b066a4eeSAbhi Das * Even if we didn't write any pages here, we might still be holding 246b066a4eeSAbhi Das * dirty pages in the ail. We forcibly flush the ail because we don't 247b066a4eeSAbhi Das * want balance_dirty_pages() to loop indefinitely trying to write out 248b066a4eeSAbhi Das * pages held in the ail that it can't find. 249b066a4eeSAbhi Das */ 250b066a4eeSAbhi Das if (ret == 0) 251b066a4eeSAbhi Das set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags); 252b066a4eeSAbhi Das 253b066a4eeSAbhi Das return ret; 254b1e71b06SSteven Whitehouse } 255b1e71b06SSteven Whitehouse 256b1e71b06SSteven Whitehouse /** 257b1e71b06SSteven Whitehouse * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages 258b1e71b06SSteven Whitehouse * @mapping: The mapping 259b1e71b06SSteven Whitehouse * @wbc: The writeback control 260b1e71b06SSteven Whitehouse * @pvec: The vector of pages 261b1e71b06SSteven Whitehouse * @nr_pages: The number of pages to write 2621272574bSFabian Frederick * @done_index: Page index 263b1e71b06SSteven Whitehouse * 264b1e71b06SSteven Whitehouse * Returns: non-zero if loop should terminate, zero otherwise 265b1e71b06SSteven Whitehouse */ 266b1e71b06SSteven Whitehouse 267b1e71b06SSteven Whitehouse static int gfs2_write_jdata_pagevec(struct address_space *mapping, 268b1e71b06SSteven Whitehouse struct writeback_control *wbc, 269b1e71b06SSteven Whitehouse struct pagevec *pvec, 2709aa01593SAndreas Gruenbacher int nr_pages, 271774016b2SSteven Whitehouse pgoff_t *done_index) 272b1e71b06SSteven Whitehouse { 273b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 274b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 27509cbfeafSKirill A. Shutemov unsigned nrblocks = nr_pages * (PAGE_SIZE/inode->i_sb->s_blocksize); 276b1e71b06SSteven Whitehouse int i; 277b1e71b06SSteven Whitehouse int ret; 278b1e71b06SSteven Whitehouse 279b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); 280b1e71b06SSteven Whitehouse if (ret < 0) 281b1e71b06SSteven Whitehouse return ret; 282b1e71b06SSteven Whitehouse 283b1e71b06SSteven Whitehouse for(i = 0; i < nr_pages; i++) { 284b1e71b06SSteven Whitehouse struct page *page = pvec->pages[i]; 285b1e71b06SSteven Whitehouse 286774016b2SSteven Whitehouse *done_index = page->index; 287774016b2SSteven Whitehouse 288b1e71b06SSteven Whitehouse lock_page(page); 289b1e71b06SSteven Whitehouse 290b1e71b06SSteven Whitehouse if (unlikely(page->mapping != mapping)) { 291774016b2SSteven Whitehouse continue_unlock: 292b1e71b06SSteven Whitehouse unlock_page(page); 293b1e71b06SSteven Whitehouse continue; 294b1e71b06SSteven Whitehouse } 295b1e71b06SSteven Whitehouse 296774016b2SSteven Whitehouse if (!PageDirty(page)) { 297774016b2SSteven Whitehouse /* someone wrote it for us */ 298774016b2SSteven Whitehouse goto continue_unlock; 299b1e71b06SSteven Whitehouse } 300b1e71b06SSteven Whitehouse 301774016b2SSteven Whitehouse if (PageWriteback(page)) { 302b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_NONE) 303b1e71b06SSteven Whitehouse wait_on_page_writeback(page); 304774016b2SSteven Whitehouse else 305774016b2SSteven Whitehouse goto continue_unlock; 306b1e71b06SSteven Whitehouse } 307b1e71b06SSteven Whitehouse 308774016b2SSteven Whitehouse BUG_ON(PageWriteback(page)); 309774016b2SSteven Whitehouse if (!clear_page_dirty_for_io(page)) 310774016b2SSteven Whitehouse goto continue_unlock; 311774016b2SSteven Whitehouse 312de1414a6SChristoph Hellwig trace_wbc_writepage(wbc, inode_to_bdi(inode)); 313b1e71b06SSteven Whitehouse 314b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 315774016b2SSteven Whitehouse if (unlikely(ret)) { 316774016b2SSteven Whitehouse if (ret == AOP_WRITEPAGE_ACTIVATE) { 317774016b2SSteven Whitehouse unlock_page(page); 318774016b2SSteven Whitehouse ret = 0; 319774016b2SSteven Whitehouse } else { 320b1e71b06SSteven Whitehouse 321774016b2SSteven Whitehouse /* 322774016b2SSteven Whitehouse * done_index is set past this page, 323774016b2SSteven Whitehouse * so media errors will not choke 324774016b2SSteven Whitehouse * background writeout for the entire 325774016b2SSteven Whitehouse * file. This has consequences for 326774016b2SSteven Whitehouse * range_cyclic semantics (ie. it may 327774016b2SSteven Whitehouse * not be suitable for data integrity 328774016b2SSteven Whitehouse * writeout). 329774016b2SSteven Whitehouse */ 330774016b2SSteven Whitehouse *done_index = page->index + 1; 331b1e71b06SSteven Whitehouse ret = 1; 332774016b2SSteven Whitehouse break; 333774016b2SSteven Whitehouse } 334774016b2SSteven Whitehouse } 335774016b2SSteven Whitehouse 336774016b2SSteven Whitehouse /* 337774016b2SSteven Whitehouse * We stop writing back only if we are not doing 338774016b2SSteven Whitehouse * integrity sync. In case of integrity sync we have to 339774016b2SSteven Whitehouse * keep going until we have written all the pages 340774016b2SSteven Whitehouse * we tagged for writeback prior to entering this loop. 341774016b2SSteven Whitehouse */ 342774016b2SSteven Whitehouse if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) { 343774016b2SSteven Whitehouse ret = 1; 344774016b2SSteven Whitehouse break; 345774016b2SSteven Whitehouse } 346774016b2SSteven Whitehouse 347b1e71b06SSteven Whitehouse } 348b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 349b1e71b06SSteven Whitehouse return ret; 350b1e71b06SSteven Whitehouse } 351b1e71b06SSteven Whitehouse 352b1e71b06SSteven Whitehouse /** 353b1e71b06SSteven Whitehouse * gfs2_write_cache_jdata - Like write_cache_pages but different 354b1e71b06SSteven Whitehouse * @mapping: The mapping to write 355b1e71b06SSteven Whitehouse * @wbc: The writeback control 356b1e71b06SSteven Whitehouse * 357b1e71b06SSteven Whitehouse * The reason that we use our own function here is that we need to 358b1e71b06SSteven Whitehouse * start transactions before we grab page locks. This allows us 359b1e71b06SSteven Whitehouse * to get the ordering right. 360b1e71b06SSteven Whitehouse */ 361b1e71b06SSteven Whitehouse 362b1e71b06SSteven Whitehouse static int gfs2_write_cache_jdata(struct address_space *mapping, 363b1e71b06SSteven Whitehouse struct writeback_control *wbc) 364b1e71b06SSteven Whitehouse { 365b1e71b06SSteven Whitehouse int ret = 0; 366b1e71b06SSteven Whitehouse int done = 0; 367b1e71b06SSteven Whitehouse struct pagevec pvec; 368b1e71b06SSteven Whitehouse int nr_pages; 369774016b2SSteven Whitehouse pgoff_t uninitialized_var(writeback_index); 370b1e71b06SSteven Whitehouse pgoff_t index; 371b1e71b06SSteven Whitehouse pgoff_t end; 372774016b2SSteven Whitehouse pgoff_t done_index; 373774016b2SSteven Whitehouse int cycled; 374b1e71b06SSteven Whitehouse int range_whole = 0; 375774016b2SSteven Whitehouse int tag; 376b1e71b06SSteven Whitehouse 37786679820SMel Gorman pagevec_init(&pvec); 378b1e71b06SSteven Whitehouse if (wbc->range_cyclic) { 379774016b2SSteven Whitehouse writeback_index = mapping->writeback_index; /* prev offset */ 380774016b2SSteven Whitehouse index = writeback_index; 381774016b2SSteven Whitehouse if (index == 0) 382774016b2SSteven Whitehouse cycled = 1; 383774016b2SSteven Whitehouse else 384774016b2SSteven Whitehouse cycled = 0; 385b1e71b06SSteven Whitehouse end = -1; 386b1e71b06SSteven Whitehouse } else { 38709cbfeafSKirill A. Shutemov index = wbc->range_start >> PAGE_SHIFT; 38809cbfeafSKirill A. Shutemov end = wbc->range_end >> PAGE_SHIFT; 389b1e71b06SSteven Whitehouse if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 390b1e71b06SSteven Whitehouse range_whole = 1; 391774016b2SSteven Whitehouse cycled = 1; /* ignore range_cyclic tests */ 392b1e71b06SSteven Whitehouse } 393774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 394774016b2SSteven Whitehouse tag = PAGECACHE_TAG_TOWRITE; 395774016b2SSteven Whitehouse else 396774016b2SSteven Whitehouse tag = PAGECACHE_TAG_DIRTY; 397b1e71b06SSteven Whitehouse 398b1e71b06SSteven Whitehouse retry: 399774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 400774016b2SSteven Whitehouse tag_pages_for_writeback(mapping, index, end); 401774016b2SSteven Whitehouse done_index = index; 402774016b2SSteven Whitehouse while (!done && (index <= end)) { 403d2bc5b3cSJan Kara nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end, 40467fd707fSJan Kara tag); 405774016b2SSteven Whitehouse if (nr_pages == 0) 406774016b2SSteven Whitehouse break; 407774016b2SSteven Whitehouse 4089aa01593SAndreas Gruenbacher ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, &done_index); 409b1e71b06SSteven Whitehouse if (ret) 410b1e71b06SSteven Whitehouse done = 1; 411b1e71b06SSteven Whitehouse if (ret > 0) 412b1e71b06SSteven Whitehouse ret = 0; 413b1e71b06SSteven Whitehouse pagevec_release(&pvec); 414b1e71b06SSteven Whitehouse cond_resched(); 415b1e71b06SSteven Whitehouse } 416b1e71b06SSteven Whitehouse 417774016b2SSteven Whitehouse if (!cycled && !done) { 418b1e71b06SSteven Whitehouse /* 419774016b2SSteven Whitehouse * range_cyclic: 420b1e71b06SSteven Whitehouse * We hit the last page and there is more work to be done: wrap 421b1e71b06SSteven Whitehouse * back to the start of the file 422b1e71b06SSteven Whitehouse */ 423774016b2SSteven Whitehouse cycled = 1; 424b1e71b06SSteven Whitehouse index = 0; 425774016b2SSteven Whitehouse end = writeback_index - 1; 426b1e71b06SSteven Whitehouse goto retry; 427b1e71b06SSteven Whitehouse } 428b1e71b06SSteven Whitehouse 429b1e71b06SSteven Whitehouse if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 430774016b2SSteven Whitehouse mapping->writeback_index = done_index; 431774016b2SSteven Whitehouse 432b1e71b06SSteven Whitehouse return ret; 433b1e71b06SSteven Whitehouse } 434b1e71b06SSteven Whitehouse 435b1e71b06SSteven Whitehouse 436b1e71b06SSteven Whitehouse /** 437b1e71b06SSteven Whitehouse * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk 438b1e71b06SSteven Whitehouse * @mapping: The mapping to write 439b1e71b06SSteven Whitehouse * @wbc: The writeback control 440b1e71b06SSteven Whitehouse * 441b1e71b06SSteven Whitehouse */ 442b1e71b06SSteven Whitehouse 443b1e71b06SSteven Whitehouse static int gfs2_jdata_writepages(struct address_space *mapping, 444b1e71b06SSteven Whitehouse struct writeback_control *wbc) 445b1e71b06SSteven Whitehouse { 446b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 447b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 448b1e71b06SSteven Whitehouse int ret; 449b1e71b06SSteven Whitehouse 450b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 451b1e71b06SSteven Whitehouse if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { 452805c0907SBob Peterson gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | 453805c0907SBob Peterson GFS2_LFC_JDATA_WPAGES); 454b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 455b1e71b06SSteven Whitehouse } 456b1e71b06SSteven Whitehouse return ret; 457b1e71b06SSteven Whitehouse } 458b1e71b06SSteven Whitehouse 459b1e71b06SSteven Whitehouse /** 460b1e71b06SSteven Whitehouse * stuffed_readpage - Fill in a Linux page with stuffed file data 461b1e71b06SSteven Whitehouse * @ip: the inode 462b1e71b06SSteven Whitehouse * @page: the page 463b1e71b06SSteven Whitehouse * 464b1e71b06SSteven Whitehouse * Returns: errno 465b1e71b06SSteven Whitehouse */ 466b1e71b06SSteven Whitehouse 46764bc06bbSAndreas Gruenbacher int stuffed_readpage(struct gfs2_inode *ip, struct page *page) 468b1e71b06SSteven Whitehouse { 469b1e71b06SSteven Whitehouse struct buffer_head *dibh; 470602c89d2SSteven Whitehouse u64 dsize = i_size_read(&ip->i_inode); 471b1e71b06SSteven Whitehouse void *kaddr; 472b1e71b06SSteven Whitehouse int error; 473b1e71b06SSteven Whitehouse 474b1e71b06SSteven Whitehouse /* 475b1e71b06SSteven Whitehouse * Due to the order of unstuffing files and ->fault(), we can be 476b1e71b06SSteven Whitehouse * asked for a zero page in the case of a stuffed file being extended, 477b1e71b06SSteven Whitehouse * so we need to supply one here. It doesn't happen often. 478b1e71b06SSteven Whitehouse */ 479b1e71b06SSteven Whitehouse if (unlikely(page->index)) { 48009cbfeafSKirill A. Shutemov zero_user(page, 0, PAGE_SIZE); 481b1e71b06SSteven Whitehouse SetPageUptodate(page); 482b1e71b06SSteven Whitehouse return 0; 483b1e71b06SSteven Whitehouse } 484b1e71b06SSteven Whitehouse 485b1e71b06SSteven Whitehouse error = gfs2_meta_inode_buffer(ip, &dibh); 486b1e71b06SSteven Whitehouse if (error) 487b1e71b06SSteven Whitehouse return error; 488b1e71b06SSteven Whitehouse 489d9349285SCong Wang kaddr = kmap_atomic(page); 490235628c5SAndreas Gruenbacher if (dsize > gfs2_max_stuffed_size(ip)) 491235628c5SAndreas Gruenbacher dsize = gfs2_max_stuffed_size(ip); 492602c89d2SSteven Whitehouse memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); 49309cbfeafSKirill A. Shutemov memset(kaddr + dsize, 0, PAGE_SIZE - dsize); 494d9349285SCong Wang kunmap_atomic(kaddr); 495b1e71b06SSteven Whitehouse flush_dcache_page(page); 496b1e71b06SSteven Whitehouse brelse(dibh); 497b1e71b06SSteven Whitehouse SetPageUptodate(page); 498b1e71b06SSteven Whitehouse 499b1e71b06SSteven Whitehouse return 0; 500b1e71b06SSteven Whitehouse } 501b1e71b06SSteven Whitehouse 502b1e71b06SSteven Whitehouse 503b1e71b06SSteven Whitehouse /** 504b1e71b06SSteven Whitehouse * __gfs2_readpage - readpage 505b1e71b06SSteven Whitehouse * @file: The file to read a page for 506b1e71b06SSteven Whitehouse * @page: The page to read 507b1e71b06SSteven Whitehouse * 5089db115a0SAndreas Gruenbacher * This is the core of gfs2's readpage. It's used by the internal file 5099db115a0SAndreas Gruenbacher * reading code as in that case we already hold the glock. Also it's 510b1e71b06SSteven Whitehouse * called by gfs2_readpage() once the required lock has been granted. 511b1e71b06SSteven Whitehouse */ 512b1e71b06SSteven Whitehouse 513b1e71b06SSteven Whitehouse static int __gfs2_readpage(void *file, struct page *page) 514b1e71b06SSteven Whitehouse { 515b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(page->mapping->host); 516b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 517b1e71b06SSteven Whitehouse int error; 518b1e71b06SSteven Whitehouse 519b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 520b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 521b1e71b06SSteven Whitehouse unlock_page(page); 522b1e71b06SSteven Whitehouse } else { 523b1e71b06SSteven Whitehouse error = mpage_readpage(page, gfs2_block_map); 524b1e71b06SSteven Whitehouse } 525b1e71b06SSteven Whitehouse 526b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 527b1e71b06SSteven Whitehouse return -EIO; 528b1e71b06SSteven Whitehouse 529b1e71b06SSteven Whitehouse return error; 530b1e71b06SSteven Whitehouse } 531b1e71b06SSteven Whitehouse 532b1e71b06SSteven Whitehouse /** 533b1e71b06SSteven Whitehouse * gfs2_readpage - read a page of a file 534b1e71b06SSteven Whitehouse * @file: The file to read 535b1e71b06SSteven Whitehouse * @page: The page of the file 536b1e71b06SSteven Whitehouse * 537b1e71b06SSteven Whitehouse * This deals with the locking required. We have to unlock and 538b1e71b06SSteven Whitehouse * relock the page in order to get the locking in the right 539b1e71b06SSteven Whitehouse * order. 540b1e71b06SSteven Whitehouse */ 541b1e71b06SSteven Whitehouse 542b1e71b06SSteven Whitehouse static int gfs2_readpage(struct file *file, struct page *page) 543b1e71b06SSteven Whitehouse { 544b1e71b06SSteven Whitehouse struct address_space *mapping = page->mapping; 545b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 546b1e71b06SSteven Whitehouse struct gfs2_holder gh; 547b1e71b06SSteven Whitehouse int error; 548b1e71b06SSteven Whitehouse 549b1e71b06SSteven Whitehouse unlock_page(page); 550b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 551b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&gh); 552b1e71b06SSteven Whitehouse if (unlikely(error)) 553b1e71b06SSteven Whitehouse goto out; 554b1e71b06SSteven Whitehouse error = AOP_TRUNCATED_PAGE; 555b1e71b06SSteven Whitehouse lock_page(page); 556b1e71b06SSteven Whitehouse if (page->mapping == mapping && !PageUptodate(page)) 557b1e71b06SSteven Whitehouse error = __gfs2_readpage(file, page); 558b1e71b06SSteven Whitehouse else 559b1e71b06SSteven Whitehouse unlock_page(page); 560b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 561b1e71b06SSteven Whitehouse out: 562b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 563b1e71b06SSteven Whitehouse if (error && error != AOP_TRUNCATED_PAGE) 564b1e71b06SSteven Whitehouse lock_page(page); 565b1e71b06SSteven Whitehouse return error; 566b1e71b06SSteven Whitehouse } 567b1e71b06SSteven Whitehouse 568b1e71b06SSteven Whitehouse /** 569b1e71b06SSteven Whitehouse * gfs2_internal_read - read an internal file 570b1e71b06SSteven Whitehouse * @ip: The gfs2 inode 571b1e71b06SSteven Whitehouse * @buf: The buffer to fill 572b1e71b06SSteven Whitehouse * @pos: The file position 573b1e71b06SSteven Whitehouse * @size: The amount to read 574b1e71b06SSteven Whitehouse * 575b1e71b06SSteven Whitehouse */ 576b1e71b06SSteven Whitehouse 5774306629eSAndrew Price int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, 5784306629eSAndrew Price unsigned size) 579b1e71b06SSteven Whitehouse { 580b1e71b06SSteven Whitehouse struct address_space *mapping = ip->i_inode.i_mapping; 58109cbfeafSKirill A. Shutemov unsigned long index = *pos / PAGE_SIZE; 58209cbfeafSKirill A. Shutemov unsigned offset = *pos & (PAGE_SIZE - 1); 583b1e71b06SSteven Whitehouse unsigned copied = 0; 584b1e71b06SSteven Whitehouse unsigned amt; 585b1e71b06SSteven Whitehouse struct page *page; 586b1e71b06SSteven Whitehouse void *p; 587b1e71b06SSteven Whitehouse 588b1e71b06SSteven Whitehouse do { 589b1e71b06SSteven Whitehouse amt = size - copied; 59009cbfeafSKirill A. Shutemov if (offset + size > PAGE_SIZE) 59109cbfeafSKirill A. Shutemov amt = PAGE_SIZE - offset; 592b1e71b06SSteven Whitehouse page = read_cache_page(mapping, index, __gfs2_readpage, NULL); 593b1e71b06SSteven Whitehouse if (IS_ERR(page)) 594b1e71b06SSteven Whitehouse return PTR_ERR(page); 595d9349285SCong Wang p = kmap_atomic(page); 596b1e71b06SSteven Whitehouse memcpy(buf + copied, p + offset, amt); 597d9349285SCong Wang kunmap_atomic(p); 59809cbfeafSKirill A. Shutemov put_page(page); 599b1e71b06SSteven Whitehouse copied += amt; 600b1e71b06SSteven Whitehouse index++; 601b1e71b06SSteven Whitehouse offset = 0; 602b1e71b06SSteven Whitehouse } while(copied < size); 603b1e71b06SSteven Whitehouse (*pos) += size; 604b1e71b06SSteven Whitehouse return size; 605b1e71b06SSteven Whitehouse } 606b1e71b06SSteven Whitehouse 607b1e71b06SSteven Whitehouse /** 608b1e71b06SSteven Whitehouse * gfs2_readpages - Read a bunch of pages at once 6091272574bSFabian Frederick * @file: The file to read from 6101272574bSFabian Frederick * @mapping: Address space info 6111272574bSFabian Frederick * @pages: List of pages to read 6121272574bSFabian Frederick * @nr_pages: Number of pages to read 613b1e71b06SSteven Whitehouse * 614b1e71b06SSteven Whitehouse * Some notes: 615b1e71b06SSteven Whitehouse * 1. This is only for readahead, so we can simply ignore any things 616b1e71b06SSteven Whitehouse * which are slightly inconvenient (such as locking conflicts between 617b1e71b06SSteven Whitehouse * the page lock and the glock) and return having done no I/O. Its 618b1e71b06SSteven Whitehouse * obviously not something we'd want to do on too regular a basis. 619b1e71b06SSteven Whitehouse * Any I/O we ignore at this time will be done via readpage later. 620b1e71b06SSteven Whitehouse * 2. We don't handle stuffed files here we let readpage do the honours. 621b1e71b06SSteven Whitehouse * 3. mpage_readpages() does most of the heavy lifting in the common case. 622b1e71b06SSteven Whitehouse * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. 623b1e71b06SSteven Whitehouse */ 624b1e71b06SSteven Whitehouse 625b1e71b06SSteven Whitehouse static int gfs2_readpages(struct file *file, struct address_space *mapping, 626b1e71b06SSteven Whitehouse struct list_head *pages, unsigned nr_pages) 627b1e71b06SSteven Whitehouse { 628b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 629b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 630b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 631b1e71b06SSteven Whitehouse struct gfs2_holder gh; 632b1e71b06SSteven Whitehouse int ret; 633b1e71b06SSteven Whitehouse 634b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 635b1e71b06SSteven Whitehouse ret = gfs2_glock_nq(&gh); 636b1e71b06SSteven Whitehouse if (unlikely(ret)) 637b1e71b06SSteven Whitehouse goto out_uninit; 638b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 639b1e71b06SSteven Whitehouse ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); 640b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 641b1e71b06SSteven Whitehouse out_uninit: 642b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 643b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 644b1e71b06SSteven Whitehouse ret = -EIO; 645b1e71b06SSteven Whitehouse return ret; 646b1e71b06SSteven Whitehouse } 647b1e71b06SSteven Whitehouse 648b1e71b06SSteven Whitehouse /** 649b1e71b06SSteven Whitehouse * gfs2_write_begin - Begin to write to a file 650b1e71b06SSteven Whitehouse * @file: The file to write to 651b1e71b06SSteven Whitehouse * @mapping: The mapping in which to write 652b1e71b06SSteven Whitehouse * @pos: The file offset at which to start writing 653b1e71b06SSteven Whitehouse * @len: Length of the write 654b1e71b06SSteven Whitehouse * @flags: Various flags 655b1e71b06SSteven Whitehouse * @pagep: Pointer to return the page 656b1e71b06SSteven Whitehouse * @fsdata: Pointer to return fs data (unused by GFS2) 657b1e71b06SSteven Whitehouse * 658b1e71b06SSteven Whitehouse * Returns: errno 659b1e71b06SSteven Whitehouse */ 660b1e71b06SSteven Whitehouse 661b1e71b06SSteven Whitehouse static int gfs2_write_begin(struct file *file, struct address_space *mapping, 662b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned flags, 663b1e71b06SSteven Whitehouse struct page **pagep, void **fsdata) 664b1e71b06SSteven Whitehouse { 665b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 666b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 6671946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 668b1e71b06SSteven Whitehouse unsigned int data_blocks = 0, ind_blocks = 0, rblocks; 66971f890f7SSteven Whitehouse unsigned requested = 0; 670b1e71b06SSteven Whitehouse int alloc_required; 671b1e71b06SSteven Whitehouse int error = 0; 67209cbfeafSKirill A. Shutemov pgoff_t index = pos >> PAGE_SHIFT; 67309cbfeafSKirill A. Shutemov unsigned from = pos & (PAGE_SIZE - 1); 674b1e71b06SSteven Whitehouse struct page *page; 675b1e71b06SSteven Whitehouse 676b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); 677b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&ip->i_gh); 678b1e71b06SSteven Whitehouse if (unlikely(error)) 679b1e71b06SSteven Whitehouse goto out_uninit; 6801946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 6811946f70aSBenjamin Marzinski error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 6821946f70aSBenjamin Marzinski GL_NOCACHE, &m_ip->i_gh); 6831946f70aSBenjamin Marzinski if (unlikely(error)) { 6841946f70aSBenjamin Marzinski gfs2_glock_dq(&ip->i_gh); 6851946f70aSBenjamin Marzinski goto out_uninit; 6861946f70aSBenjamin Marzinski } 6871946f70aSBenjamin Marzinski } 688b1e71b06SSteven Whitehouse 689461cb419SBob Peterson alloc_required = gfs2_write_alloc_required(ip, pos, len); 690b1e71b06SSteven Whitehouse 691b1e71b06SSteven Whitehouse if (alloc_required || gfs2_is_jdata(ip)) 692b1e71b06SSteven Whitehouse gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); 693b1e71b06SSteven Whitehouse 694b1e71b06SSteven Whitehouse if (alloc_required) { 6957b9cff46SSteven Whitehouse struct gfs2_alloc_parms ap = { .aflags = 0, }; 696b8fbf471SAbhi Das requested = data_blocks + ind_blocks; 697b8fbf471SAbhi Das ap.target = requested; 698b8fbf471SAbhi Das error = gfs2_quota_lock_check(ip, &ap); 699b1e71b06SSteven Whitehouse if (error) 7005407e242SBob Peterson goto out_unlock; 701b1e71b06SSteven Whitehouse 7027b9cff46SSteven Whitehouse error = gfs2_inplace_reserve(ip, &ap); 703b1e71b06SSteven Whitehouse if (error) 704b1e71b06SSteven Whitehouse goto out_qunlock; 705b1e71b06SSteven Whitehouse } 706b1e71b06SSteven Whitehouse 707b1e71b06SSteven Whitehouse rblocks = RES_DINODE + ind_blocks; 708b1e71b06SSteven Whitehouse if (gfs2_is_jdata(ip)) 709b1e71b06SSteven Whitehouse rblocks += data_blocks ? data_blocks : 1; 710b1e71b06SSteven Whitehouse if (ind_blocks || data_blocks) 711b1e71b06SSteven Whitehouse rblocks += RES_STATFS + RES_QUOTA; 7121946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) 7131946f70aSBenjamin Marzinski rblocks += 2 * RES_STATFS; 714bf97b673SBenjamin Marzinski if (alloc_required) 71571f890f7SSteven Whitehouse rblocks += gfs2_rg_blocks(ip, requested); 716b1e71b06SSteven Whitehouse 717b1e71b06SSteven Whitehouse error = gfs2_trans_begin(sdp, rblocks, 71809cbfeafSKirill A. Shutemov PAGE_SIZE/sdp->sd_sb.sb_bsize); 719b1e71b06SSteven Whitehouse if (error) 720b1e71b06SSteven Whitehouse goto out_trans_fail; 721b1e71b06SSteven Whitehouse 722b1e71b06SSteven Whitehouse error = -ENOMEM; 723b1e71b06SSteven Whitehouse flags |= AOP_FLAG_NOFS; 724b1e71b06SSteven Whitehouse page = grab_cache_page_write_begin(mapping, index, flags); 725b1e71b06SSteven Whitehouse *pagep = page; 726b1e71b06SSteven Whitehouse if (unlikely(!page)) 727b1e71b06SSteven Whitehouse goto out_endtrans; 728b1e71b06SSteven Whitehouse 729b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 730b1e71b06SSteven Whitehouse error = 0; 731235628c5SAndreas Gruenbacher if (pos + len > gfs2_max_stuffed_size(ip)) { 732b1e71b06SSteven Whitehouse error = gfs2_unstuff_dinode(ip, page); 733b1e71b06SSteven Whitehouse if (error == 0) 734b1e71b06SSteven Whitehouse goto prepare_write; 735b1e71b06SSteven Whitehouse } else if (!PageUptodate(page)) { 736b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 737b1e71b06SSteven Whitehouse } 738b1e71b06SSteven Whitehouse goto out; 739b1e71b06SSteven Whitehouse } 740b1e71b06SSteven Whitehouse 741b1e71b06SSteven Whitehouse prepare_write: 742ebdec241SChristoph Hellwig error = __block_write_begin(page, from, len, gfs2_block_map); 743b1e71b06SSteven Whitehouse out: 744b1e71b06SSteven Whitehouse if (error == 0) 745b1e71b06SSteven Whitehouse return 0; 746b1e71b06SSteven Whitehouse 7476c474f7bSMaxim unlock_page(page); 74809cbfeafSKirill A. Shutemov put_page(page); 74915c6fd97Snpiggin@suse.de 750ff8f33c8SSteven Whitehouse gfs2_trans_end(sdp); 7517b5747f4SAndreas Gruenbacher if (alloc_required) { 7527b5747f4SAndreas Gruenbacher gfs2_inplace_release(ip); 753b1e71b06SSteven Whitehouse if (pos + len > ip->i_inode.i_size) 754ff8f33c8SSteven Whitehouse gfs2_trim_blocks(&ip->i_inode); 7557b5747f4SAndreas Gruenbacher } 7567b5747f4SAndreas Gruenbacher goto out_qunlock; 757ff8f33c8SSteven Whitehouse 758b1e71b06SSteven Whitehouse out_endtrans: 759b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 760b1e71b06SSteven Whitehouse out_trans_fail: 7617b5747f4SAndreas Gruenbacher if (alloc_required) 762b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 763b1e71b06SSteven Whitehouse out_qunlock: 7647b5747f4SAndreas Gruenbacher if (alloc_required) 765b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 766b1e71b06SSteven Whitehouse out_unlock: 7671946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 7681946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 7691946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 7701946f70aSBenjamin Marzinski } 771b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 772b1e71b06SSteven Whitehouse out_uninit: 773b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 774b1e71b06SSteven Whitehouse return error; 775b1e71b06SSteven Whitehouse } 776b1e71b06SSteven Whitehouse 777b1e71b06SSteven Whitehouse /** 778b1e71b06SSteven Whitehouse * adjust_fs_space - Adjusts the free space available due to gfs2_grow 779b1e71b06SSteven Whitehouse * @inode: the rindex inode 780b1e71b06SSteven Whitehouse */ 78164bc06bbSAndreas Gruenbacher void adjust_fs_space(struct inode *inode) 782b1e71b06SSteven Whitehouse { 783b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; 7841946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 7851946f70aSBenjamin Marzinski struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 786b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 787b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 7881946f70aSBenjamin Marzinski struct buffer_head *m_bh, *l_bh; 789b1e71b06SSteven Whitehouse u64 fs_total, new_free; 790b1e71b06SSteven Whitehouse 791b1e71b06SSteven Whitehouse /* Total up the file system space, according to the latest rindex. */ 792b1e71b06SSteven Whitehouse fs_total = gfs2_ri_total(sdp); 7931946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) 7941946f70aSBenjamin Marzinski return; 795b1e71b06SSteven Whitehouse 796b1e71b06SSteven Whitehouse spin_lock(&sdp->sd_statfs_spin); 7971946f70aSBenjamin Marzinski gfs2_statfs_change_in(m_sc, m_bh->b_data + 7981946f70aSBenjamin Marzinski sizeof(struct gfs2_dinode)); 799b1e71b06SSteven Whitehouse if (fs_total > (m_sc->sc_total + l_sc->sc_total)) 800b1e71b06SSteven Whitehouse new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); 801b1e71b06SSteven Whitehouse else 802b1e71b06SSteven Whitehouse new_free = 0; 803b1e71b06SSteven Whitehouse spin_unlock(&sdp->sd_statfs_spin); 804b1e71b06SSteven Whitehouse fs_warn(sdp, "File system extended by %llu blocks.\n", 805b1e71b06SSteven Whitehouse (unsigned long long)new_free); 806b1e71b06SSteven Whitehouse gfs2_statfs_change(sdp, new_free, new_free, 0); 8071946f70aSBenjamin Marzinski 8081946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) 8091946f70aSBenjamin Marzinski goto out; 8101946f70aSBenjamin Marzinski update_statfs(sdp, m_bh, l_bh); 8111946f70aSBenjamin Marzinski brelse(l_bh); 8121946f70aSBenjamin Marzinski out: 8131946f70aSBenjamin Marzinski brelse(m_bh); 814b1e71b06SSteven Whitehouse } 815b1e71b06SSteven Whitehouse 816b1e71b06SSteven Whitehouse /** 817b1e71b06SSteven Whitehouse * gfs2_stuffed_write_end - Write end for stuffed files 818b1e71b06SSteven Whitehouse * @inode: The inode 819b1e71b06SSteven Whitehouse * @dibh: The buffer_head containing the on-disk inode 820b1e71b06SSteven Whitehouse * @pos: The file position 821b1e71b06SSteven Whitehouse * @copied: How much was actually copied by the VFS 822b1e71b06SSteven Whitehouse * @page: The page 823b1e71b06SSteven Whitehouse * 824b1e71b06SSteven Whitehouse * This copies the data from the page into the inode block after 825b1e71b06SSteven Whitehouse * the inode data structure itself. 826b1e71b06SSteven Whitehouse * 82764bc06bbSAndreas Gruenbacher * Returns: copied bytes or errno 828b1e71b06SSteven Whitehouse */ 82964bc06bbSAndreas Gruenbacher int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, 830d6382a35SAndreas Gruenbacher loff_t pos, unsigned copied, 831b1e71b06SSteven Whitehouse struct page *page) 832b1e71b06SSteven Whitehouse { 833b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 834b1e71b06SSteven Whitehouse u64 to = pos + copied; 835b1e71b06SSteven Whitehouse void *kaddr; 836b1e71b06SSteven Whitehouse unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); 837b1e71b06SSteven Whitehouse 838d6382a35SAndreas Gruenbacher BUG_ON(pos + copied > gfs2_max_stuffed_size(ip)); 839235628c5SAndreas Gruenbacher 840d9349285SCong Wang kaddr = kmap_atomic(page); 841b1e71b06SSteven Whitehouse memcpy(buf + pos, kaddr + pos, copied); 842b1e71b06SSteven Whitehouse flush_dcache_page(page); 843d9349285SCong Wang kunmap_atomic(kaddr); 844b1e71b06SSteven Whitehouse 84543388b21SAl Viro WARN_ON(!PageUptodate(page)); 846b1e71b06SSteven Whitehouse unlock_page(page); 84709cbfeafSKirill A. Shutemov put_page(page); 848b1e71b06SSteven Whitehouse 849b1e71b06SSteven Whitehouse if (copied) { 850a2e0f799SSteven Whitehouse if (inode->i_size < to) 851b1e71b06SSteven Whitehouse i_size_write(inode, to); 852b1e71b06SSteven Whitehouse mark_inode_dirty(inode); 853b1e71b06SSteven Whitehouse } 854b1e71b06SSteven Whitehouse return copied; 855b1e71b06SSteven Whitehouse } 856b1e71b06SSteven Whitehouse 857b1e71b06SSteven Whitehouse /** 858b1e71b06SSteven Whitehouse * gfs2_write_end 859b1e71b06SSteven Whitehouse * @file: The file to write to 860b1e71b06SSteven Whitehouse * @mapping: The address space to write to 861b1e71b06SSteven Whitehouse * @pos: The file position 862b1e71b06SSteven Whitehouse * @len: The length of the data 8631272574bSFabian Frederick * @copied: How much was actually copied by the VFS 864b1e71b06SSteven Whitehouse * @page: The page that has been written 865b1e71b06SSteven Whitehouse * @fsdata: The fsdata (unused in GFS2) 866b1e71b06SSteven Whitehouse * 867d6382a35SAndreas Gruenbacher * The main write_end function for GFS2. We just put our locking around the VFS 868d6382a35SAndreas Gruenbacher * provided functions. 869b1e71b06SSteven Whitehouse * 87064bc06bbSAndreas Gruenbacher * Returns: copied bytes or errno 871b1e71b06SSteven Whitehouse */ 872b1e71b06SSteven Whitehouse 873b1e71b06SSteven Whitehouse static int gfs2_write_end(struct file *file, struct address_space *mapping, 874b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 875b1e71b06SSteven Whitehouse struct page *page, void *fsdata) 876b1e71b06SSteven Whitehouse { 877b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 878b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 879b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 8801946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 881b1e71b06SSteven Whitehouse struct buffer_head *dibh; 882b1e71b06SSteven Whitehouse int ret; 8830c901809SBenjamin Marzinski struct gfs2_trans *tr = current->journal_info; 8840c901809SBenjamin Marzinski BUG_ON(!tr); 885b1e71b06SSteven Whitehouse 886b1e71b06SSteven Whitehouse BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); 887b1e71b06SSteven Whitehouse 888b1e71b06SSteven Whitehouse ret = gfs2_meta_inode_buffer(ip, &dibh); 889d6382a35SAndreas Gruenbacher if (unlikely(ret)) 890d6382a35SAndreas Gruenbacher goto out; 891b1e71b06SSteven Whitehouse 892d6382a35SAndreas Gruenbacher if (gfs2_is_stuffed(ip)) { 893d6382a35SAndreas Gruenbacher ret = gfs2_stuffed_write_end(inode, dibh, pos, copied, page); 894d6382a35SAndreas Gruenbacher page = NULL; 895d6382a35SAndreas Gruenbacher goto out2; 896d6382a35SAndreas Gruenbacher } 897b1e71b06SSteven Whitehouse 898845802b1SAndreas Gruenbacher if (gfs2_is_jdata(ip)) 89988b65ce5SAndreas Gruenbacher gfs2_page_add_databufs(ip, page, pos & ~PAGE_MASK, len); 900845802b1SAndreas Gruenbacher else 901845802b1SAndreas Gruenbacher gfs2_ordered_add_inode(ip); 902b1e71b06SSteven Whitehouse 903b1e71b06SSteven Whitehouse ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); 904d6382a35SAndreas Gruenbacher page = NULL; 9050c901809SBenjamin Marzinski if (tr->tr_num_buf_new) 9060c901809SBenjamin Marzinski __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 9070c901809SBenjamin Marzinski else 9080c901809SBenjamin Marzinski gfs2_trans_add_meta(ip->i_gl, dibh); 9090c901809SBenjamin Marzinski 910d6382a35SAndreas Gruenbacher out2: 9119ae3c6deSBenjamin Marzinski if (inode == sdp->sd_rindex) { 912b1e71b06SSteven Whitehouse adjust_fs_space(inode); 913ca9248d8SBob Peterson sdp->sd_rindex_uptodate = 0; 9149ae3c6deSBenjamin Marzinski } 915b1e71b06SSteven Whitehouse 916b1e71b06SSteven Whitehouse brelse(dibh); 917d6382a35SAndreas Gruenbacher out: 918d6382a35SAndreas Gruenbacher if (page) { 919d6382a35SAndreas Gruenbacher unlock_page(page); 920d6382a35SAndreas Gruenbacher put_page(page); 921d6382a35SAndreas Gruenbacher } 922deab72d3SBob Peterson gfs2_trans_end(sdp); 923b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 924b54e9a0bSBob Peterson if (ip->i_qadata && ip->i_qadata->qa_qd_num) 925b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 9261946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 9271946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 9281946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 9291946f70aSBenjamin Marzinski } 930b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 931b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 932b1e71b06SSteven Whitehouse return ret; 933b1e71b06SSteven Whitehouse } 934b1e71b06SSteven Whitehouse 935b1e71b06SSteven Whitehouse /** 936b9e03f18SBob Peterson * jdata_set_page_dirty - Page dirtying function 937b1e71b06SSteven Whitehouse * @page: The page to dirty 938b1e71b06SSteven Whitehouse * 939b1e71b06SSteven Whitehouse * Returns: 1 if it dirtyed the page, or 0 otherwise 940b1e71b06SSteven Whitehouse */ 941b1e71b06SSteven Whitehouse 942b9e03f18SBob Peterson static int jdata_set_page_dirty(struct page *page) 943b1e71b06SSteven Whitehouse { 944b1e71b06SSteven Whitehouse SetPageChecked(page); 945b1e71b06SSteven Whitehouse return __set_page_dirty_buffers(page); 946b1e71b06SSteven Whitehouse } 947b1e71b06SSteven Whitehouse 948b1e71b06SSteven Whitehouse /** 949b1e71b06SSteven Whitehouse * gfs2_bmap - Block map function 950b1e71b06SSteven Whitehouse * @mapping: Address space info 951b1e71b06SSteven Whitehouse * @lblock: The block to map 952b1e71b06SSteven Whitehouse * 953b1e71b06SSteven Whitehouse * Returns: The disk address for the block or 0 on hole or error 954b1e71b06SSteven Whitehouse */ 955b1e71b06SSteven Whitehouse 956b1e71b06SSteven Whitehouse static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) 957b1e71b06SSteven Whitehouse { 958b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 959b1e71b06SSteven Whitehouse struct gfs2_holder i_gh; 960b1e71b06SSteven Whitehouse sector_t dblock = 0; 961b1e71b06SSteven Whitehouse int error; 962b1e71b06SSteven Whitehouse 963b1e71b06SSteven Whitehouse error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 964b1e71b06SSteven Whitehouse if (error) 965b1e71b06SSteven Whitehouse return 0; 966b1e71b06SSteven Whitehouse 967b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 968b1e71b06SSteven Whitehouse dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); 969b1e71b06SSteven Whitehouse 970b1e71b06SSteven Whitehouse gfs2_glock_dq_uninit(&i_gh); 971b1e71b06SSteven Whitehouse 972b1e71b06SSteven Whitehouse return dblock; 973b1e71b06SSteven Whitehouse } 974b1e71b06SSteven Whitehouse 975b1e71b06SSteven Whitehouse static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) 976b1e71b06SSteven Whitehouse { 977b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 978b1e71b06SSteven Whitehouse 979b1e71b06SSteven Whitehouse lock_buffer(bh); 980b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 981b1e71b06SSteven Whitehouse clear_buffer_dirty(bh); 982b1e71b06SSteven Whitehouse bd = bh->b_private; 983b1e71b06SSteven Whitehouse if (bd) { 984c0752aa7SBob Peterson if (!list_empty(&bd->bd_list) && !buffer_pinned(bh)) 985c0752aa7SBob Peterson list_del_init(&bd->bd_list); 986b1e71b06SSteven Whitehouse else 98768cd4ce2SBob Peterson gfs2_remove_from_journal(bh, REMOVE_JDATA); 988b1e71b06SSteven Whitehouse } 989b1e71b06SSteven Whitehouse bh->b_bdev = NULL; 990b1e71b06SSteven Whitehouse clear_buffer_mapped(bh); 991b1e71b06SSteven Whitehouse clear_buffer_req(bh); 992b1e71b06SSteven Whitehouse clear_buffer_new(bh); 993b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 994b1e71b06SSteven Whitehouse unlock_buffer(bh); 995b1e71b06SSteven Whitehouse } 996b1e71b06SSteven Whitehouse 997d47992f8SLukas Czerner static void gfs2_invalidatepage(struct page *page, unsigned int offset, 998d47992f8SLukas Czerner unsigned int length) 999b1e71b06SSteven Whitehouse { 1000b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 10015c0bb97cSLukas Czerner unsigned int stop = offset + length; 100209cbfeafSKirill A. Shutemov int partial_page = (offset || length < PAGE_SIZE); 1003b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 1004b1e71b06SSteven Whitehouse unsigned long pos = 0; 1005b1e71b06SSteven Whitehouse 1006b1e71b06SSteven Whitehouse BUG_ON(!PageLocked(page)); 10075c0bb97cSLukas Czerner if (!partial_page) 1008b1e71b06SSteven Whitehouse ClearPageChecked(page); 1009b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 1010b1e71b06SSteven Whitehouse goto out; 1011b1e71b06SSteven Whitehouse 1012b1e71b06SSteven Whitehouse bh = head = page_buffers(page); 1013b1e71b06SSteven Whitehouse do { 10145c0bb97cSLukas Czerner if (pos + bh->b_size > stop) 10155c0bb97cSLukas Czerner return; 10165c0bb97cSLukas Czerner 1017b1e71b06SSteven Whitehouse if (offset <= pos) 1018b1e71b06SSteven Whitehouse gfs2_discard(sdp, bh); 1019b1e71b06SSteven Whitehouse pos += bh->b_size; 1020b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1021b1e71b06SSteven Whitehouse } while (bh != head); 1022b1e71b06SSteven Whitehouse out: 10235c0bb97cSLukas Czerner if (!partial_page) 1024b1e71b06SSteven Whitehouse try_to_release_page(page, 0); 1025b1e71b06SSteven Whitehouse } 1026b1e71b06SSteven Whitehouse 1027b1e71b06SSteven Whitehouse /** 1028b1e71b06SSteven Whitehouse * gfs2_ok_for_dio - check that dio is valid on this file 1029b1e71b06SSteven Whitehouse * @ip: The inode 1030b1e71b06SSteven Whitehouse * @offset: The offset at which we are reading or writing 1031b1e71b06SSteven Whitehouse * 1032b1e71b06SSteven Whitehouse * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) 1033b1e71b06SSteven Whitehouse * 1 (to accept the i/o request) 1034b1e71b06SSteven Whitehouse */ 10356f673763SOmar Sandoval static int gfs2_ok_for_dio(struct gfs2_inode *ip, loff_t offset) 1036b1e71b06SSteven Whitehouse { 1037b1e71b06SSteven Whitehouse /* 1038b1e71b06SSteven Whitehouse * Should we return an error here? I can't see that O_DIRECT for 1039b1e71b06SSteven Whitehouse * a stuffed file makes any sense. For now we'll silently fall 1040b1e71b06SSteven Whitehouse * back to buffered I/O 1041b1e71b06SSteven Whitehouse */ 1042b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 1043b1e71b06SSteven Whitehouse return 0; 1044b1e71b06SSteven Whitehouse 1045b1e71b06SSteven Whitehouse if (offset >= i_size_read(&ip->i_inode)) 1046b1e71b06SSteven Whitehouse return 0; 1047b1e71b06SSteven Whitehouse return 1; 1048b1e71b06SSteven Whitehouse } 1049b1e71b06SSteven Whitehouse 1050b1e71b06SSteven Whitehouse 1051b1e71b06SSteven Whitehouse 1052c8b8e32dSChristoph Hellwig static ssize_t gfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 1053b1e71b06SSteven Whitehouse { 1054b1e71b06SSteven Whitehouse struct file *file = iocb->ki_filp; 1055b1e71b06SSteven Whitehouse struct inode *inode = file->f_mapping->host; 1056dfd11184SSteven Whitehouse struct address_space *mapping = inode->i_mapping; 1057b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1058c8b8e32dSChristoph Hellwig loff_t offset = iocb->ki_pos; 1059b1e71b06SSteven Whitehouse struct gfs2_holder gh; 1060b1e71b06SSteven Whitehouse int rv; 1061b1e71b06SSteven Whitehouse 1062b1e71b06SSteven Whitehouse /* 1063b1e71b06SSteven Whitehouse * Deferred lock, even if its a write, since we do no allocation 1064b1e71b06SSteven Whitehouse * on this path. All we need change is atime, and this lock mode 1065b1e71b06SSteven Whitehouse * ensures that other nodes have flushed their buffered read caches 1066b1e71b06SSteven Whitehouse * (i.e. their page cache entries for this inode). We do not, 1067b1e71b06SSteven Whitehouse * unfortunately have the option of only flushing a range like 1068b1e71b06SSteven Whitehouse * the VFS does. 1069b1e71b06SSteven Whitehouse */ 1070b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); 1071b1e71b06SSteven Whitehouse rv = gfs2_glock_nq(&gh); 1072b1e71b06SSteven Whitehouse if (rv) 10739c7fe835SDaniel DeFreez goto out_uninit; 10746f673763SOmar Sandoval rv = gfs2_ok_for_dio(ip, offset); 1075b1e71b06SSteven Whitehouse if (rv != 1) 1076b1e71b06SSteven Whitehouse goto out; /* dio not valid, fall back to buffered i/o */ 1077b1e71b06SSteven Whitehouse 1078dfd11184SSteven Whitehouse /* 1079dfd11184SSteven Whitehouse * Now since we are holding a deferred (CW) lock at this point, you 1080dfd11184SSteven Whitehouse * might be wondering why this is ever needed. There is a case however 1081dfd11184SSteven Whitehouse * where we've granted a deferred local lock against a cached exclusive 1082dfd11184SSteven Whitehouse * glock. That is ok provided all granted local locks are deferred, but 1083dfd11184SSteven Whitehouse * it also means that it is possible to encounter pages which are 1084dfd11184SSteven Whitehouse * cached and possibly also mapped. So here we check for that and sort 1085dfd11184SSteven Whitehouse * them out ahead of the dio. The glock state machine will take care of 1086dfd11184SSteven Whitehouse * everything else. 1087dfd11184SSteven Whitehouse * 1088dfd11184SSteven Whitehouse * If in fact the cached glock state (gl->gl_state) is deferred (CW) in 1089dfd11184SSteven Whitehouse * the first place, mapping->nr_pages will always be zero. 1090dfd11184SSteven Whitehouse */ 1091dfd11184SSteven Whitehouse if (mapping->nrpages) { 109209cbfeafSKirill A. Shutemov loff_t lstart = offset & ~(PAGE_SIZE - 1); 1093a6cbcd4aSAl Viro loff_t len = iov_iter_count(iter); 1094dfd11184SSteven Whitehouse loff_t end = PAGE_ALIGN(offset + len) - 1; 1095dfd11184SSteven Whitehouse 1096dfd11184SSteven Whitehouse rv = 0; 1097dfd11184SSteven Whitehouse if (len == 0) 1098dfd11184SSteven Whitehouse goto out; 1099dfd11184SSteven Whitehouse if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags)) 1100dfd11184SSteven Whitehouse unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len); 1101dfd11184SSteven Whitehouse rv = filemap_write_and_wait_range(mapping, lstart, end); 1102dfd11184SSteven Whitehouse if (rv) 1103086352f1SSteven Whitehouse goto out; 11046f673763SOmar Sandoval if (iov_iter_rw(iter) == WRITE) 1105dfd11184SSteven Whitehouse truncate_inode_pages_range(mapping, lstart, end); 1106dfd11184SSteven Whitehouse } 1107dfd11184SSteven Whitehouse 110817f8c842SOmar Sandoval rv = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, 1109c8b8e32dSChristoph Hellwig gfs2_get_block_direct, NULL, NULL, 0); 1110b1e71b06SSteven Whitehouse out: 11118e711e10SBob Peterson gfs2_glock_dq(&gh); 11129c7fe835SDaniel DeFreez out_uninit: 1113b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 1114b1e71b06SSteven Whitehouse return rv; 1115b1e71b06SSteven Whitehouse } 1116b1e71b06SSteven Whitehouse 1117b1e71b06SSteven Whitehouse /** 1118b1e71b06SSteven Whitehouse * gfs2_releasepage - free the metadata associated with a page 1119b1e71b06SSteven Whitehouse * @page: the page that's being released 1120b1e71b06SSteven Whitehouse * @gfp_mask: passed from Linux VFS, ignored by us 1121b1e71b06SSteven Whitehouse * 1122b1e71b06SSteven Whitehouse * Call try_to_free_buffers() if the buffers in this page can be 1123b1e71b06SSteven Whitehouse * released. 1124b1e71b06SSteven Whitehouse * 1125b1e71b06SSteven Whitehouse * Returns: 0 1126b1e71b06SSteven Whitehouse */ 1127b1e71b06SSteven Whitehouse 1128b1e71b06SSteven Whitehouse int gfs2_releasepage(struct page *page, gfp_t gfp_mask) 1129b1e71b06SSteven Whitehouse { 1130009d8518SSteven Whitehouse struct address_space *mapping = page->mapping; 1131009d8518SSteven Whitehouse struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 1132b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 1133b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 1134b1e71b06SSteven Whitehouse 1135b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 1136b1e71b06SSteven Whitehouse return 0; 1137b1e71b06SSteven Whitehouse 11381c185c02SAndreas Gruenbacher /* 11391c185c02SAndreas Gruenbacher * From xfs_vm_releasepage: mm accommodates an old ext3 case where 11401c185c02SAndreas Gruenbacher * clean pages might not have had the dirty bit cleared. Thus, it can 11411c185c02SAndreas Gruenbacher * send actual dirty pages to ->releasepage() via shrink_active_list(). 11421c185c02SAndreas Gruenbacher * 11431c185c02SAndreas Gruenbacher * As a workaround, we skip pages that contain dirty buffers below. 11441c185c02SAndreas Gruenbacher * Once ->releasepage isn't called on dirty pages anymore, we can warn 11451c185c02SAndreas Gruenbacher * on dirty buffers like we used to here again. 11461c185c02SAndreas Gruenbacher */ 11471c185c02SAndreas Gruenbacher 1148b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 1149380f7c65SSteven Whitehouse spin_lock(&sdp->sd_ail_lock); 1150b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1151b1e71b06SSteven Whitehouse do { 1152b1e71b06SSteven Whitehouse if (atomic_read(&bh->b_count)) 1153b1e71b06SSteven Whitehouse goto cannot_release; 1154b1e71b06SSteven Whitehouse bd = bh->b_private; 115516ca9412SBenjamin Marzinski if (bd && bd->bd_tr) 1156b1e71b06SSteven Whitehouse goto cannot_release; 11571c185c02SAndreas Gruenbacher if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh))) 11581c185c02SAndreas Gruenbacher goto cannot_release; 1159b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1160b1e71b06SSteven Whitehouse } while(bh != head); 1161380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 1162b1e71b06SSteven Whitehouse 1163b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1164b1e71b06SSteven Whitehouse do { 1165b1e71b06SSteven Whitehouse bd = bh->b_private; 1166b1e71b06SSteven Whitehouse if (bd) { 1167b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, bd->bd_bh == bh); 1168e4f29206SSteven Whitehouse if (!list_empty(&bd->bd_list)) 1169c0752aa7SBob Peterson list_del_init(&bd->bd_list); 1170b1e71b06SSteven Whitehouse bd->bd_bh = NULL; 1171b1e71b06SSteven Whitehouse bh->b_private = NULL; 1172b1e71b06SSteven Whitehouse kmem_cache_free(gfs2_bufdata_cachep, bd); 1173e4f29206SSteven Whitehouse } 1174b1e71b06SSteven Whitehouse 1175b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1176b1e71b06SSteven Whitehouse } while (bh != head); 1177e4f29206SSteven Whitehouse gfs2_log_unlock(sdp); 1178b1e71b06SSteven Whitehouse 1179b1e71b06SSteven Whitehouse return try_to_free_buffers(page); 11808f065d36SSteven Whitehouse 1181b1e71b06SSteven Whitehouse cannot_release: 1182380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 1183b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1184b1e71b06SSteven Whitehouse return 0; 1185b1e71b06SSteven Whitehouse } 1186b1e71b06SSteven Whitehouse 1187b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_writeback_aops = { 11889d358143SSteven Whitehouse .writepage = gfs2_writepage, 118945138990SSteven Whitehouse .writepages = gfs2_writepages, 1190b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1191b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1192b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1193b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1194b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1195b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1196b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1197b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1198b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1199b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1200aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1201b1e71b06SSteven Whitehouse }; 1202b1e71b06SSteven Whitehouse 1203b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_ordered_aops = { 12049d358143SSteven Whitehouse .writepage = gfs2_writepage, 120545138990SSteven Whitehouse .writepages = gfs2_writepages, 1206b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1207b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1208b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1209b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1210b9e03f18SBob Peterson .set_page_dirty = __set_page_dirty_buffers, 1211b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1212b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1213b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1214b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1215b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1216b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1217aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1218b1e71b06SSteven Whitehouse }; 1219b1e71b06SSteven Whitehouse 1220b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_jdata_aops = { 1221b1e71b06SSteven Whitehouse .writepage = gfs2_jdata_writepage, 1222b1e71b06SSteven Whitehouse .writepages = gfs2_jdata_writepages, 1223b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1224b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1225b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1226b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1227b9e03f18SBob Peterson .set_page_dirty = jdata_set_page_dirty, 1228b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1229b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1230b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1231b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1232aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1233b1e71b06SSteven Whitehouse }; 1234b1e71b06SSteven Whitehouse 1235b1e71b06SSteven Whitehouse void gfs2_set_aops(struct inode *inode) 1236b1e71b06SSteven Whitehouse { 1237b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1238b1e71b06SSteven Whitehouse 1239b1e71b06SSteven Whitehouse if (gfs2_is_writeback(ip)) 1240b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_writeback_aops; 1241b1e71b06SSteven Whitehouse else if (gfs2_is_ordered(ip)) 1242b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_ordered_aops; 1243b1e71b06SSteven Whitehouse else if (gfs2_is_jdata(ip)) 1244b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_jdata_aops; 1245b1e71b06SSteven Whitehouse else 1246b1e71b06SSteven Whitehouse BUG(); 1247b1e71b06SSteven Whitehouse } 1248b1e71b06SSteven Whitehouse 1249