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, 4288b65ce5SAndreas Gruenbacher unsigned int from, unsigned int len) 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; 4788b65ce5SAndreas Gruenbacher unsigned int to = from + len; 48b1e71b06SSteven Whitehouse unsigned int start, end; 49b1e71b06SSteven Whitehouse 50b1e71b06SSteven Whitehouse for (bh = head, start = 0; bh != head || !start; 51b1e71b06SSteven Whitehouse bh = bh->b_this_page, start = end) { 52b1e71b06SSteven Whitehouse end = start + bsize; 5388b65ce5SAndreas Gruenbacher if (end <= from) 54b1e71b06SSteven Whitehouse continue; 5588b65ce5SAndreas Gruenbacher if (start >= to) 5688b65ce5SAndreas Gruenbacher break; 57b1e71b06SSteven Whitehouse if (gfs2_is_jdata(ip)) 58b1e71b06SSteven Whitehouse set_buffer_uptodate(bh); 59350a9b0aSSteven Whitehouse gfs2_trans_add_data(ip->i_gl, bh); 60b1e71b06SSteven Whitehouse } 61b1e71b06SSteven Whitehouse } 62b1e71b06SSteven Whitehouse 63b1e71b06SSteven Whitehouse /** 64b1e71b06SSteven Whitehouse * gfs2_get_block_noalloc - Fills in a buffer head with details about a block 65b1e71b06SSteven Whitehouse * @inode: The inode 66b1e71b06SSteven Whitehouse * @lblock: The block number to look up 67b1e71b06SSteven Whitehouse * @bh_result: The buffer head to return the result in 68b1e71b06SSteven Whitehouse * @create: Non-zero if we may add block to the file 69b1e71b06SSteven Whitehouse * 70b1e71b06SSteven Whitehouse * Returns: errno 71b1e71b06SSteven Whitehouse */ 72b1e71b06SSteven Whitehouse 73b1e71b06SSteven Whitehouse static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, 74b1e71b06SSteven Whitehouse struct buffer_head *bh_result, int create) 75b1e71b06SSteven Whitehouse { 76b1e71b06SSteven Whitehouse int error; 77b1e71b06SSteven Whitehouse 78b1e71b06SSteven Whitehouse error = gfs2_block_map(inode, lblock, bh_result, 0); 79b1e71b06SSteven Whitehouse if (error) 80b1e71b06SSteven Whitehouse return error; 81b1e71b06SSteven Whitehouse if (!buffer_mapped(bh_result)) 82b1e71b06SSteven Whitehouse return -EIO; 83b1e71b06SSteven Whitehouse return 0; 84b1e71b06SSteven Whitehouse } 85b1e71b06SSteven Whitehouse 86b1e71b06SSteven Whitehouse static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, 87b1e71b06SSteven Whitehouse struct buffer_head *bh_result, int create) 88b1e71b06SSteven Whitehouse { 89b1e71b06SSteven Whitehouse return gfs2_block_map(inode, lblock, bh_result, 0); 90b1e71b06SSteven Whitehouse } 91b1e71b06SSteven Whitehouse 92b1e71b06SSteven Whitehouse /** 93b1e71b06SSteven Whitehouse * gfs2_writepage_common - Common bits of writepage 94b1e71b06SSteven Whitehouse * @page: The page to be written 95b1e71b06SSteven Whitehouse * @wbc: The writeback control 96b1e71b06SSteven Whitehouse * 97b1e71b06SSteven Whitehouse * Returns: 1 if writepage is ok, otherwise an error code or zero if no error. 98b1e71b06SSteven Whitehouse */ 99b1e71b06SSteven Whitehouse 100b1e71b06SSteven Whitehouse static int gfs2_writepage_common(struct page *page, 101b1e71b06SSteven Whitehouse struct writeback_control *wbc) 102b1e71b06SSteven Whitehouse { 103b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 104b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 105b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 106b1e71b06SSteven Whitehouse loff_t i_size = i_size_read(inode); 10709cbfeafSKirill A. Shutemov pgoff_t end_index = i_size >> PAGE_SHIFT; 108b1e71b06SSteven Whitehouse unsigned offset; 109b1e71b06SSteven Whitehouse 110b1e71b06SSteven Whitehouse if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 111b1e71b06SSteven Whitehouse goto out; 112b1e71b06SSteven Whitehouse if (current->journal_info) 113b1e71b06SSteven Whitehouse goto redirty; 114b1e71b06SSteven Whitehouse /* Is the page fully outside i_size? (truncate in progress) */ 11509cbfeafSKirill A. Shutemov offset = i_size & (PAGE_SIZE-1); 116b1e71b06SSteven Whitehouse if (page->index > end_index || (page->index == end_index && !offset)) { 11709cbfeafSKirill A. Shutemov page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 118b1e71b06SSteven Whitehouse goto out; 119b1e71b06SSteven Whitehouse } 120b1e71b06SSteven Whitehouse return 1; 121b1e71b06SSteven Whitehouse redirty: 122b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 123b1e71b06SSteven Whitehouse out: 124b1e71b06SSteven Whitehouse unlock_page(page); 125b1e71b06SSteven Whitehouse return 0; 126b1e71b06SSteven Whitehouse } 127b1e71b06SSteven Whitehouse 128b1e71b06SSteven Whitehouse /** 1299d358143SSteven Whitehouse * gfs2_writepage - Write page for writeback mappings 130b1e71b06SSteven Whitehouse * @page: The page 131b1e71b06SSteven Whitehouse * @wbc: The writeback control 132b1e71b06SSteven Whitehouse * 133b1e71b06SSteven Whitehouse */ 134b1e71b06SSteven Whitehouse 1359d358143SSteven Whitehouse static int gfs2_writepage(struct page *page, struct writeback_control *wbc) 136b1e71b06SSteven Whitehouse { 137b1e71b06SSteven Whitehouse int ret; 138b1e71b06SSteven Whitehouse 139b1e71b06SSteven Whitehouse ret = gfs2_writepage_common(page, wbc); 140b1e71b06SSteven Whitehouse if (ret <= 0) 141b1e71b06SSteven Whitehouse return ret; 142b1e71b06SSteven Whitehouse 14330116ff6SSteven Whitehouse return nobh_writepage(page, gfs2_get_block_noalloc, wbc); 144b1e71b06SSteven Whitehouse } 145b1e71b06SSteven Whitehouse 146fd4c5748SBenjamin Marzinski /* This is the same as calling block_write_full_page, but it also 147fd4c5748SBenjamin Marzinski * writes pages outside of i_size 148fd4c5748SBenjamin Marzinski */ 149c548a1c1SAndrew Price static int gfs2_write_full_page(struct page *page, get_block_t *get_block, 150fd4c5748SBenjamin Marzinski struct writeback_control *wbc) 151fd4c5748SBenjamin Marzinski { 152fd4c5748SBenjamin Marzinski struct inode * const inode = page->mapping->host; 153fd4c5748SBenjamin Marzinski loff_t i_size = i_size_read(inode); 154fd4c5748SBenjamin Marzinski const pgoff_t end_index = i_size >> PAGE_SHIFT; 155fd4c5748SBenjamin Marzinski unsigned offset; 156fd4c5748SBenjamin Marzinski 157fd4c5748SBenjamin Marzinski /* 158fd4c5748SBenjamin Marzinski * The page straddles i_size. It must be zeroed out on each and every 159fd4c5748SBenjamin Marzinski * writepage invocation because it may be mmapped. "A file is mapped 160fd4c5748SBenjamin Marzinski * in multiples of the page size. For a file that is not a multiple of 161fd4c5748SBenjamin Marzinski * the page size, the remaining memory is zeroed when mapped, and 162fd4c5748SBenjamin Marzinski * writes to that region are not written out to the file." 163fd4c5748SBenjamin Marzinski */ 164fd4c5748SBenjamin Marzinski offset = i_size & (PAGE_SIZE-1); 165fd4c5748SBenjamin Marzinski if (page->index == end_index && offset) 166fd4c5748SBenjamin Marzinski zero_user_segment(page, offset, PAGE_SIZE); 167fd4c5748SBenjamin Marzinski 168fd4c5748SBenjamin Marzinski return __block_write_full_page(inode, page, get_block, wbc, 169fd4c5748SBenjamin Marzinski end_buffer_async_write); 170fd4c5748SBenjamin Marzinski } 171fd4c5748SBenjamin Marzinski 172b1e71b06SSteven Whitehouse /** 173b1e71b06SSteven Whitehouse * __gfs2_jdata_writepage - The core of jdata writepage 174b1e71b06SSteven Whitehouse * @page: The page to write 175b1e71b06SSteven Whitehouse * @wbc: The writeback control 176b1e71b06SSteven Whitehouse * 177b1e71b06SSteven Whitehouse * This is shared between writepage and writepages and implements the 178b1e71b06SSteven Whitehouse * core of the writepage operation. If a transaction is required then 179b1e71b06SSteven Whitehouse * PageChecked will have been set and the transaction will have 180b1e71b06SSteven Whitehouse * already been started before this is called. 181b1e71b06SSteven Whitehouse */ 182b1e71b06SSteven Whitehouse 183b1e71b06SSteven Whitehouse static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 184b1e71b06SSteven Whitehouse { 185b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 186b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 187b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 188b1e71b06SSteven Whitehouse 189b1e71b06SSteven Whitehouse if (PageChecked(page)) { 190b1e71b06SSteven Whitehouse ClearPageChecked(page); 191b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) { 192b1e71b06SSteven Whitehouse create_empty_buffers(page, inode->i_sb->s_blocksize, 19347a9a527SFabian Frederick BIT(BH_Dirty)|BIT(BH_Uptodate)); 194b1e71b06SSteven Whitehouse } 19588b65ce5SAndreas Gruenbacher gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize); 196b1e71b06SSteven Whitehouse } 197fd4c5748SBenjamin Marzinski return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc); 198b1e71b06SSteven Whitehouse } 199b1e71b06SSteven Whitehouse 200b1e71b06SSteven Whitehouse /** 201b1e71b06SSteven Whitehouse * gfs2_jdata_writepage - Write complete page 202b1e71b06SSteven Whitehouse * @page: Page to write 2031272574bSFabian Frederick * @wbc: The writeback control 204b1e71b06SSteven Whitehouse * 205b1e71b06SSteven Whitehouse * Returns: errno 206b1e71b06SSteven Whitehouse * 207b1e71b06SSteven Whitehouse */ 208b1e71b06SSteven Whitehouse 209b1e71b06SSteven Whitehouse static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 210b1e71b06SSteven Whitehouse { 211b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 212fd4c5748SBenjamin Marzinski struct gfs2_inode *ip = GFS2_I(inode); 213b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 214b1e71b06SSteven Whitehouse int ret; 215b1e71b06SSteven Whitehouse 216fd4c5748SBenjamin Marzinski if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 217fd4c5748SBenjamin Marzinski goto out; 218fd4c5748SBenjamin Marzinski if (PageChecked(page) || current->journal_info) 219b1e71b06SSteven Whitehouse goto out_ignore; 220b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 221b1e71b06SSteven Whitehouse return ret; 222b1e71b06SSteven Whitehouse 223b1e71b06SSteven Whitehouse out_ignore: 224b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 225fd4c5748SBenjamin Marzinski out: 226b1e71b06SSteven Whitehouse unlock_page(page); 227b1e71b06SSteven Whitehouse return 0; 228b1e71b06SSteven Whitehouse } 229b1e71b06SSteven Whitehouse 230b1e71b06SSteven Whitehouse /** 23145138990SSteven Whitehouse * gfs2_writepages - Write a bunch of dirty pages back to disk 232b1e71b06SSteven Whitehouse * @mapping: The mapping to write 233b1e71b06SSteven Whitehouse * @wbc: Write-back control 234b1e71b06SSteven Whitehouse * 23545138990SSteven Whitehouse * Used for both ordered and writeback modes. 236b1e71b06SSteven Whitehouse */ 23745138990SSteven Whitehouse static int gfs2_writepages(struct address_space *mapping, 238b1e71b06SSteven Whitehouse struct writeback_control *wbc) 239b1e71b06SSteven Whitehouse { 240b066a4eeSAbhi Das struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 241b066a4eeSAbhi Das int ret = mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); 242b066a4eeSAbhi Das 243b066a4eeSAbhi Das /* 244b066a4eeSAbhi Das * Even if we didn't write any pages here, we might still be holding 245b066a4eeSAbhi Das * dirty pages in the ail. We forcibly flush the ail because we don't 246b066a4eeSAbhi Das * want balance_dirty_pages() to loop indefinitely trying to write out 247b066a4eeSAbhi Das * pages held in the ail that it can't find. 248b066a4eeSAbhi Das */ 249b066a4eeSAbhi Das if (ret == 0) 250b066a4eeSAbhi Das set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags); 251b066a4eeSAbhi Das 252b066a4eeSAbhi Das return ret; 253b1e71b06SSteven Whitehouse } 254b1e71b06SSteven Whitehouse 255b1e71b06SSteven Whitehouse /** 256b1e71b06SSteven Whitehouse * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages 257b1e71b06SSteven Whitehouse * @mapping: The mapping 258b1e71b06SSteven Whitehouse * @wbc: The writeback control 259b1e71b06SSteven Whitehouse * @pvec: The vector of pages 260b1e71b06SSteven Whitehouse * @nr_pages: The number of pages to write 2611272574bSFabian Frederick * @done_index: Page index 262b1e71b06SSteven Whitehouse * 263b1e71b06SSteven Whitehouse * Returns: non-zero if loop should terminate, zero otherwise 264b1e71b06SSteven Whitehouse */ 265b1e71b06SSteven Whitehouse 266b1e71b06SSteven Whitehouse static int gfs2_write_jdata_pagevec(struct address_space *mapping, 267b1e71b06SSteven Whitehouse struct writeback_control *wbc, 268b1e71b06SSteven Whitehouse struct pagevec *pvec, 2699aa01593SAndreas Gruenbacher int nr_pages, 270774016b2SSteven Whitehouse pgoff_t *done_index) 271b1e71b06SSteven Whitehouse { 272b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 273b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 27409cbfeafSKirill A. Shutemov unsigned nrblocks = nr_pages * (PAGE_SIZE/inode->i_sb->s_blocksize); 275b1e71b06SSteven Whitehouse int i; 276b1e71b06SSteven Whitehouse int ret; 277b1e71b06SSteven Whitehouse 278b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); 279b1e71b06SSteven Whitehouse if (ret < 0) 280b1e71b06SSteven Whitehouse return ret; 281b1e71b06SSteven Whitehouse 282b1e71b06SSteven Whitehouse for(i = 0; i < nr_pages; i++) { 283b1e71b06SSteven Whitehouse struct page *page = pvec->pages[i]; 284b1e71b06SSteven Whitehouse 285774016b2SSteven Whitehouse *done_index = page->index; 286774016b2SSteven Whitehouse 287b1e71b06SSteven Whitehouse lock_page(page); 288b1e71b06SSteven Whitehouse 289b1e71b06SSteven Whitehouse if (unlikely(page->mapping != mapping)) { 290774016b2SSteven Whitehouse continue_unlock: 291b1e71b06SSteven Whitehouse unlock_page(page); 292b1e71b06SSteven Whitehouse continue; 293b1e71b06SSteven Whitehouse } 294b1e71b06SSteven Whitehouse 295774016b2SSteven Whitehouse if (!PageDirty(page)) { 296774016b2SSteven Whitehouse /* someone wrote it for us */ 297774016b2SSteven Whitehouse goto continue_unlock; 298b1e71b06SSteven Whitehouse } 299b1e71b06SSteven Whitehouse 300774016b2SSteven Whitehouse if (PageWriteback(page)) { 301b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_NONE) 302b1e71b06SSteven Whitehouse wait_on_page_writeback(page); 303774016b2SSteven Whitehouse else 304774016b2SSteven Whitehouse goto continue_unlock; 305b1e71b06SSteven Whitehouse } 306b1e71b06SSteven Whitehouse 307774016b2SSteven Whitehouse BUG_ON(PageWriteback(page)); 308774016b2SSteven Whitehouse if (!clear_page_dirty_for_io(page)) 309774016b2SSteven Whitehouse goto continue_unlock; 310774016b2SSteven Whitehouse 311de1414a6SChristoph Hellwig trace_wbc_writepage(wbc, inode_to_bdi(inode)); 312b1e71b06SSteven Whitehouse 313b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 314774016b2SSteven Whitehouse if (unlikely(ret)) { 315774016b2SSteven Whitehouse if (ret == AOP_WRITEPAGE_ACTIVATE) { 316774016b2SSteven Whitehouse unlock_page(page); 317774016b2SSteven Whitehouse ret = 0; 318774016b2SSteven Whitehouse } else { 319b1e71b06SSteven Whitehouse 320774016b2SSteven Whitehouse /* 321774016b2SSteven Whitehouse * done_index is set past this page, 322774016b2SSteven Whitehouse * so media errors will not choke 323774016b2SSteven Whitehouse * background writeout for the entire 324774016b2SSteven Whitehouse * file. This has consequences for 325774016b2SSteven Whitehouse * range_cyclic semantics (ie. it may 326774016b2SSteven Whitehouse * not be suitable for data integrity 327774016b2SSteven Whitehouse * writeout). 328774016b2SSteven Whitehouse */ 329774016b2SSteven Whitehouse *done_index = page->index + 1; 330b1e71b06SSteven Whitehouse ret = 1; 331774016b2SSteven Whitehouse break; 332774016b2SSteven Whitehouse } 333774016b2SSteven Whitehouse } 334774016b2SSteven Whitehouse 335774016b2SSteven Whitehouse /* 336774016b2SSteven Whitehouse * We stop writing back only if we are not doing 337774016b2SSteven Whitehouse * integrity sync. In case of integrity sync we have to 338774016b2SSteven Whitehouse * keep going until we have written all the pages 339774016b2SSteven Whitehouse * we tagged for writeback prior to entering this loop. 340774016b2SSteven Whitehouse */ 341774016b2SSteven Whitehouse if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) { 342774016b2SSteven Whitehouse ret = 1; 343774016b2SSteven Whitehouse break; 344774016b2SSteven Whitehouse } 345774016b2SSteven Whitehouse 346b1e71b06SSteven Whitehouse } 347b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 348b1e71b06SSteven Whitehouse return ret; 349b1e71b06SSteven Whitehouse } 350b1e71b06SSteven Whitehouse 351b1e71b06SSteven Whitehouse /** 352b1e71b06SSteven Whitehouse * gfs2_write_cache_jdata - Like write_cache_pages but different 353b1e71b06SSteven Whitehouse * @mapping: The mapping to write 354b1e71b06SSteven Whitehouse * @wbc: The writeback control 355b1e71b06SSteven Whitehouse * 356b1e71b06SSteven Whitehouse * The reason that we use our own function here is that we need to 357b1e71b06SSteven Whitehouse * start transactions before we grab page locks. This allows us 358b1e71b06SSteven Whitehouse * to get the ordering right. 359b1e71b06SSteven Whitehouse */ 360b1e71b06SSteven Whitehouse 361b1e71b06SSteven Whitehouse static int gfs2_write_cache_jdata(struct address_space *mapping, 362b1e71b06SSteven Whitehouse struct writeback_control *wbc) 363b1e71b06SSteven Whitehouse { 364b1e71b06SSteven Whitehouse int ret = 0; 365b1e71b06SSteven Whitehouse int done = 0; 366b1e71b06SSteven Whitehouse struct pagevec pvec; 367b1e71b06SSteven Whitehouse int nr_pages; 368774016b2SSteven Whitehouse pgoff_t uninitialized_var(writeback_index); 369b1e71b06SSteven Whitehouse pgoff_t index; 370b1e71b06SSteven Whitehouse pgoff_t end; 371774016b2SSteven Whitehouse pgoff_t done_index; 372774016b2SSteven Whitehouse int cycled; 373b1e71b06SSteven Whitehouse int range_whole = 0; 374774016b2SSteven Whitehouse int tag; 375b1e71b06SSteven Whitehouse 37686679820SMel Gorman pagevec_init(&pvec); 377b1e71b06SSteven Whitehouse if (wbc->range_cyclic) { 378774016b2SSteven Whitehouse writeback_index = mapping->writeback_index; /* prev offset */ 379774016b2SSteven Whitehouse index = writeback_index; 380774016b2SSteven Whitehouse if (index == 0) 381774016b2SSteven Whitehouse cycled = 1; 382774016b2SSteven Whitehouse else 383774016b2SSteven Whitehouse cycled = 0; 384b1e71b06SSteven Whitehouse end = -1; 385b1e71b06SSteven Whitehouse } else { 38609cbfeafSKirill A. Shutemov index = wbc->range_start >> PAGE_SHIFT; 38709cbfeafSKirill A. Shutemov end = wbc->range_end >> PAGE_SHIFT; 388b1e71b06SSteven Whitehouse if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 389b1e71b06SSteven Whitehouse range_whole = 1; 390774016b2SSteven Whitehouse cycled = 1; /* ignore range_cyclic tests */ 391b1e71b06SSteven Whitehouse } 392774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 393774016b2SSteven Whitehouse tag = PAGECACHE_TAG_TOWRITE; 394774016b2SSteven Whitehouse else 395774016b2SSteven Whitehouse tag = PAGECACHE_TAG_DIRTY; 396b1e71b06SSteven Whitehouse 397b1e71b06SSteven Whitehouse retry: 398774016b2SSteven Whitehouse if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 399774016b2SSteven Whitehouse tag_pages_for_writeback(mapping, index, end); 400774016b2SSteven Whitehouse done_index = index; 401774016b2SSteven Whitehouse while (!done && (index <= end)) { 402d2bc5b3cSJan Kara nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end, 40367fd707fSJan Kara tag); 404774016b2SSteven Whitehouse if (nr_pages == 0) 405774016b2SSteven Whitehouse break; 406774016b2SSteven Whitehouse 4079aa01593SAndreas Gruenbacher ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, &done_index); 408b1e71b06SSteven Whitehouse if (ret) 409b1e71b06SSteven Whitehouse done = 1; 410b1e71b06SSteven Whitehouse if (ret > 0) 411b1e71b06SSteven Whitehouse ret = 0; 412b1e71b06SSteven Whitehouse pagevec_release(&pvec); 413b1e71b06SSteven Whitehouse cond_resched(); 414b1e71b06SSteven Whitehouse } 415b1e71b06SSteven Whitehouse 416774016b2SSteven Whitehouse if (!cycled && !done) { 417b1e71b06SSteven Whitehouse /* 418774016b2SSteven Whitehouse * range_cyclic: 419b1e71b06SSteven Whitehouse * We hit the last page and there is more work to be done: wrap 420b1e71b06SSteven Whitehouse * back to the start of the file 421b1e71b06SSteven Whitehouse */ 422774016b2SSteven Whitehouse cycled = 1; 423b1e71b06SSteven Whitehouse index = 0; 424774016b2SSteven Whitehouse end = writeback_index - 1; 425b1e71b06SSteven Whitehouse goto retry; 426b1e71b06SSteven Whitehouse } 427b1e71b06SSteven Whitehouse 428b1e71b06SSteven Whitehouse if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 429774016b2SSteven Whitehouse mapping->writeback_index = done_index; 430774016b2SSteven Whitehouse 431b1e71b06SSteven Whitehouse return ret; 432b1e71b06SSteven Whitehouse } 433b1e71b06SSteven Whitehouse 434b1e71b06SSteven Whitehouse 435b1e71b06SSteven Whitehouse /** 436b1e71b06SSteven Whitehouse * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk 437b1e71b06SSteven Whitehouse * @mapping: The mapping to write 438b1e71b06SSteven Whitehouse * @wbc: The writeback control 439b1e71b06SSteven Whitehouse * 440b1e71b06SSteven Whitehouse */ 441b1e71b06SSteven Whitehouse 442b1e71b06SSteven Whitehouse static int gfs2_jdata_writepages(struct address_space *mapping, 443b1e71b06SSteven Whitehouse struct writeback_control *wbc) 444b1e71b06SSteven Whitehouse { 445b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 446b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 447b1e71b06SSteven Whitehouse int ret; 448b1e71b06SSteven Whitehouse 449b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 450b1e71b06SSteven Whitehouse if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { 451805c0907SBob Peterson gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | 452805c0907SBob Peterson GFS2_LFC_JDATA_WPAGES); 453b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 454b1e71b06SSteven Whitehouse } 455b1e71b06SSteven Whitehouse return ret; 456b1e71b06SSteven Whitehouse } 457b1e71b06SSteven Whitehouse 458b1e71b06SSteven Whitehouse /** 459b1e71b06SSteven Whitehouse * stuffed_readpage - Fill in a Linux page with stuffed file data 460b1e71b06SSteven Whitehouse * @ip: the inode 461b1e71b06SSteven Whitehouse * @page: the page 462b1e71b06SSteven Whitehouse * 463b1e71b06SSteven Whitehouse * Returns: errno 464b1e71b06SSteven Whitehouse */ 465b1e71b06SSteven Whitehouse 466b1e71b06SSteven Whitehouse static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) 467b1e71b06SSteven Whitehouse { 468b1e71b06SSteven Whitehouse struct buffer_head *dibh; 469602c89d2SSteven Whitehouse u64 dsize = i_size_read(&ip->i_inode); 470b1e71b06SSteven Whitehouse void *kaddr; 471b1e71b06SSteven Whitehouse int error; 472b1e71b06SSteven Whitehouse 473b1e71b06SSteven Whitehouse /* 474b1e71b06SSteven Whitehouse * Due to the order of unstuffing files and ->fault(), we can be 475b1e71b06SSteven Whitehouse * asked for a zero page in the case of a stuffed file being extended, 476b1e71b06SSteven Whitehouse * so we need to supply one here. It doesn't happen often. 477b1e71b06SSteven Whitehouse */ 478b1e71b06SSteven Whitehouse if (unlikely(page->index)) { 47909cbfeafSKirill A. Shutemov zero_user(page, 0, PAGE_SIZE); 480b1e71b06SSteven Whitehouse SetPageUptodate(page); 481b1e71b06SSteven Whitehouse return 0; 482b1e71b06SSteven Whitehouse } 483b1e71b06SSteven Whitehouse 484b1e71b06SSteven Whitehouse error = gfs2_meta_inode_buffer(ip, &dibh); 485b1e71b06SSteven Whitehouse if (error) 486b1e71b06SSteven Whitehouse return error; 487b1e71b06SSteven Whitehouse 488d9349285SCong Wang kaddr = kmap_atomic(page); 489235628c5SAndreas Gruenbacher if (dsize > gfs2_max_stuffed_size(ip)) 490235628c5SAndreas Gruenbacher dsize = gfs2_max_stuffed_size(ip); 491602c89d2SSteven Whitehouse memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); 49209cbfeafSKirill A. Shutemov memset(kaddr + dsize, 0, PAGE_SIZE - dsize); 493d9349285SCong Wang kunmap_atomic(kaddr); 494b1e71b06SSteven Whitehouse flush_dcache_page(page); 495b1e71b06SSteven Whitehouse brelse(dibh); 496b1e71b06SSteven Whitehouse SetPageUptodate(page); 497b1e71b06SSteven Whitehouse 498b1e71b06SSteven Whitehouse return 0; 499b1e71b06SSteven Whitehouse } 500b1e71b06SSteven Whitehouse 501b1e71b06SSteven Whitehouse 502b1e71b06SSteven Whitehouse /** 503b1e71b06SSteven Whitehouse * __gfs2_readpage - readpage 504b1e71b06SSteven Whitehouse * @file: The file to read a page for 505b1e71b06SSteven Whitehouse * @page: The page to read 506b1e71b06SSteven Whitehouse * 5079db115a0SAndreas Gruenbacher * This is the core of gfs2's readpage. It's used by the internal file 5089db115a0SAndreas Gruenbacher * reading code as in that case we already hold the glock. Also it's 509b1e71b06SSteven Whitehouse * called by gfs2_readpage() once the required lock has been granted. 510b1e71b06SSteven Whitehouse */ 511b1e71b06SSteven Whitehouse 512b1e71b06SSteven Whitehouse static int __gfs2_readpage(void *file, struct page *page) 513b1e71b06SSteven Whitehouse { 514b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(page->mapping->host); 515b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 516b1e71b06SSteven Whitehouse int error; 517b1e71b06SSteven Whitehouse 518b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 519b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 520b1e71b06SSteven Whitehouse unlock_page(page); 521b1e71b06SSteven Whitehouse } else { 522b1e71b06SSteven Whitehouse error = mpage_readpage(page, gfs2_block_map); 523b1e71b06SSteven Whitehouse } 524b1e71b06SSteven Whitehouse 525b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 526b1e71b06SSteven Whitehouse return -EIO; 527b1e71b06SSteven Whitehouse 528b1e71b06SSteven Whitehouse return error; 529b1e71b06SSteven Whitehouse } 530b1e71b06SSteven Whitehouse 531b1e71b06SSteven Whitehouse /** 532b1e71b06SSteven Whitehouse * gfs2_readpage - read a page of a file 533b1e71b06SSteven Whitehouse * @file: The file to read 534b1e71b06SSteven Whitehouse * @page: The page of the file 535b1e71b06SSteven Whitehouse * 536b1e71b06SSteven Whitehouse * This deals with the locking required. We have to unlock and 537b1e71b06SSteven Whitehouse * relock the page in order to get the locking in the right 538b1e71b06SSteven Whitehouse * order. 539b1e71b06SSteven Whitehouse */ 540b1e71b06SSteven Whitehouse 541b1e71b06SSteven Whitehouse static int gfs2_readpage(struct file *file, struct page *page) 542b1e71b06SSteven Whitehouse { 543b1e71b06SSteven Whitehouse struct address_space *mapping = page->mapping; 544b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 545b1e71b06SSteven Whitehouse struct gfs2_holder gh; 546b1e71b06SSteven Whitehouse int error; 547b1e71b06SSteven Whitehouse 548b1e71b06SSteven Whitehouse unlock_page(page); 549b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 550b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&gh); 551b1e71b06SSteven Whitehouse if (unlikely(error)) 552b1e71b06SSteven Whitehouse goto out; 553b1e71b06SSteven Whitehouse error = AOP_TRUNCATED_PAGE; 554b1e71b06SSteven Whitehouse lock_page(page); 555b1e71b06SSteven Whitehouse if (page->mapping == mapping && !PageUptodate(page)) 556b1e71b06SSteven Whitehouse error = __gfs2_readpage(file, page); 557b1e71b06SSteven Whitehouse else 558b1e71b06SSteven Whitehouse unlock_page(page); 559b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 560b1e71b06SSteven Whitehouse out: 561b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 562b1e71b06SSteven Whitehouse if (error && error != AOP_TRUNCATED_PAGE) 563b1e71b06SSteven Whitehouse lock_page(page); 564b1e71b06SSteven Whitehouse return error; 565b1e71b06SSteven Whitehouse } 566b1e71b06SSteven Whitehouse 567b1e71b06SSteven Whitehouse /** 568b1e71b06SSteven Whitehouse * gfs2_internal_read - read an internal file 569b1e71b06SSteven Whitehouse * @ip: The gfs2 inode 570b1e71b06SSteven Whitehouse * @buf: The buffer to fill 571b1e71b06SSteven Whitehouse * @pos: The file position 572b1e71b06SSteven Whitehouse * @size: The amount to read 573b1e71b06SSteven Whitehouse * 574b1e71b06SSteven Whitehouse */ 575b1e71b06SSteven Whitehouse 5764306629eSAndrew Price int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, 5774306629eSAndrew Price unsigned size) 578b1e71b06SSteven Whitehouse { 579b1e71b06SSteven Whitehouse struct address_space *mapping = ip->i_inode.i_mapping; 58009cbfeafSKirill A. Shutemov unsigned long index = *pos / PAGE_SIZE; 58109cbfeafSKirill A. Shutemov unsigned offset = *pos & (PAGE_SIZE - 1); 582b1e71b06SSteven Whitehouse unsigned copied = 0; 583b1e71b06SSteven Whitehouse unsigned amt; 584b1e71b06SSteven Whitehouse struct page *page; 585b1e71b06SSteven Whitehouse void *p; 586b1e71b06SSteven Whitehouse 587b1e71b06SSteven Whitehouse do { 588b1e71b06SSteven Whitehouse amt = size - copied; 58909cbfeafSKirill A. Shutemov if (offset + size > PAGE_SIZE) 59009cbfeafSKirill A. Shutemov amt = PAGE_SIZE - offset; 591b1e71b06SSteven Whitehouse page = read_cache_page(mapping, index, __gfs2_readpage, NULL); 592b1e71b06SSteven Whitehouse if (IS_ERR(page)) 593b1e71b06SSteven Whitehouse return PTR_ERR(page); 594d9349285SCong Wang p = kmap_atomic(page); 595b1e71b06SSteven Whitehouse memcpy(buf + copied, p + offset, amt); 596d9349285SCong Wang kunmap_atomic(p); 59709cbfeafSKirill A. Shutemov put_page(page); 598b1e71b06SSteven Whitehouse copied += amt; 599b1e71b06SSteven Whitehouse index++; 600b1e71b06SSteven Whitehouse offset = 0; 601b1e71b06SSteven Whitehouse } while(copied < size); 602b1e71b06SSteven Whitehouse (*pos) += size; 603b1e71b06SSteven Whitehouse return size; 604b1e71b06SSteven Whitehouse } 605b1e71b06SSteven Whitehouse 606b1e71b06SSteven Whitehouse /** 607b1e71b06SSteven Whitehouse * gfs2_readpages - Read a bunch of pages at once 6081272574bSFabian Frederick * @file: The file to read from 6091272574bSFabian Frederick * @mapping: Address space info 6101272574bSFabian Frederick * @pages: List of pages to read 6111272574bSFabian Frederick * @nr_pages: Number of pages to read 612b1e71b06SSteven Whitehouse * 613b1e71b06SSteven Whitehouse * Some notes: 614b1e71b06SSteven Whitehouse * 1. This is only for readahead, so we can simply ignore any things 615b1e71b06SSteven Whitehouse * which are slightly inconvenient (such as locking conflicts between 616b1e71b06SSteven Whitehouse * the page lock and the glock) and return having done no I/O. Its 617b1e71b06SSteven Whitehouse * obviously not something we'd want to do on too regular a basis. 618b1e71b06SSteven Whitehouse * Any I/O we ignore at this time will be done via readpage later. 619b1e71b06SSteven Whitehouse * 2. We don't handle stuffed files here we let readpage do the honours. 620b1e71b06SSteven Whitehouse * 3. mpage_readpages() does most of the heavy lifting in the common case. 621b1e71b06SSteven Whitehouse * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. 622b1e71b06SSteven Whitehouse */ 623b1e71b06SSteven Whitehouse 624b1e71b06SSteven Whitehouse static int gfs2_readpages(struct file *file, struct address_space *mapping, 625b1e71b06SSteven Whitehouse struct list_head *pages, unsigned nr_pages) 626b1e71b06SSteven Whitehouse { 627b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 628b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 629b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 630b1e71b06SSteven Whitehouse struct gfs2_holder gh; 631b1e71b06SSteven Whitehouse int ret; 632b1e71b06SSteven Whitehouse 633b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 634b1e71b06SSteven Whitehouse ret = gfs2_glock_nq(&gh); 635b1e71b06SSteven Whitehouse if (unlikely(ret)) 636b1e71b06SSteven Whitehouse goto out_uninit; 637b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 638b1e71b06SSteven Whitehouse ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); 639b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 640b1e71b06SSteven Whitehouse out_uninit: 641b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 642b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 643b1e71b06SSteven Whitehouse ret = -EIO; 644b1e71b06SSteven Whitehouse return ret; 645b1e71b06SSteven Whitehouse } 646b1e71b06SSteven Whitehouse 647b1e71b06SSteven Whitehouse /** 648b1e71b06SSteven Whitehouse * gfs2_write_begin - Begin to write to a file 649b1e71b06SSteven Whitehouse * @file: The file to write to 650b1e71b06SSteven Whitehouse * @mapping: The mapping in which to write 651b1e71b06SSteven Whitehouse * @pos: The file offset at which to start writing 652b1e71b06SSteven Whitehouse * @len: Length of the write 653b1e71b06SSteven Whitehouse * @flags: Various flags 654b1e71b06SSteven Whitehouse * @pagep: Pointer to return the page 655b1e71b06SSteven Whitehouse * @fsdata: Pointer to return fs data (unused by GFS2) 656b1e71b06SSteven Whitehouse * 657b1e71b06SSteven Whitehouse * Returns: errno 658b1e71b06SSteven Whitehouse */ 659b1e71b06SSteven Whitehouse 660b1e71b06SSteven Whitehouse static int gfs2_write_begin(struct file *file, struct address_space *mapping, 661b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned flags, 662b1e71b06SSteven Whitehouse struct page **pagep, void **fsdata) 663b1e71b06SSteven Whitehouse { 664b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 665b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 6661946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 667b1e71b06SSteven Whitehouse unsigned int data_blocks = 0, ind_blocks = 0, rblocks; 66871f890f7SSteven Whitehouse unsigned requested = 0; 669b1e71b06SSteven Whitehouse int alloc_required; 670b1e71b06SSteven Whitehouse int error = 0; 67109cbfeafSKirill A. Shutemov pgoff_t index = pos >> PAGE_SHIFT; 67209cbfeafSKirill A. Shutemov unsigned from = pos & (PAGE_SIZE - 1); 673b1e71b06SSteven Whitehouse struct page *page; 674b1e71b06SSteven Whitehouse 675b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); 676b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&ip->i_gh); 677b1e71b06SSteven Whitehouse if (unlikely(error)) 678b1e71b06SSteven Whitehouse goto out_uninit; 6791946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 6801946f70aSBenjamin Marzinski error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 6811946f70aSBenjamin Marzinski GL_NOCACHE, &m_ip->i_gh); 6821946f70aSBenjamin Marzinski if (unlikely(error)) { 6831946f70aSBenjamin Marzinski gfs2_glock_dq(&ip->i_gh); 6841946f70aSBenjamin Marzinski goto out_uninit; 6851946f70aSBenjamin Marzinski } 6861946f70aSBenjamin Marzinski } 687b1e71b06SSteven Whitehouse 688461cb419SBob Peterson alloc_required = gfs2_write_alloc_required(ip, pos, len); 689b1e71b06SSteven Whitehouse 690b1e71b06SSteven Whitehouse if (alloc_required || gfs2_is_jdata(ip)) 691b1e71b06SSteven Whitehouse gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); 692b1e71b06SSteven Whitehouse 693b1e71b06SSteven Whitehouse if (alloc_required) { 6947b9cff46SSteven Whitehouse struct gfs2_alloc_parms ap = { .aflags = 0, }; 695b8fbf471SAbhi Das requested = data_blocks + ind_blocks; 696b8fbf471SAbhi Das ap.target = requested; 697b8fbf471SAbhi Das error = gfs2_quota_lock_check(ip, &ap); 698b1e71b06SSteven Whitehouse if (error) 6995407e242SBob Peterson goto out_unlock; 700b1e71b06SSteven Whitehouse 7017b9cff46SSteven Whitehouse error = gfs2_inplace_reserve(ip, &ap); 702b1e71b06SSteven Whitehouse if (error) 703b1e71b06SSteven Whitehouse goto out_qunlock; 704b1e71b06SSteven Whitehouse } 705b1e71b06SSteven Whitehouse 706b1e71b06SSteven Whitehouse rblocks = RES_DINODE + ind_blocks; 707b1e71b06SSteven Whitehouse if (gfs2_is_jdata(ip)) 708b1e71b06SSteven Whitehouse rblocks += data_blocks ? data_blocks : 1; 709b1e71b06SSteven Whitehouse if (ind_blocks || data_blocks) 710b1e71b06SSteven Whitehouse rblocks += RES_STATFS + RES_QUOTA; 7111946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) 7121946f70aSBenjamin Marzinski rblocks += 2 * RES_STATFS; 713bf97b673SBenjamin Marzinski if (alloc_required) 71471f890f7SSteven Whitehouse rblocks += gfs2_rg_blocks(ip, requested); 715b1e71b06SSteven Whitehouse 716b1e71b06SSteven Whitehouse error = gfs2_trans_begin(sdp, rblocks, 71709cbfeafSKirill A. Shutemov PAGE_SIZE/sdp->sd_sb.sb_bsize); 718b1e71b06SSteven Whitehouse if (error) 719b1e71b06SSteven Whitehouse goto out_trans_fail; 720b1e71b06SSteven Whitehouse 721b1e71b06SSteven Whitehouse error = -ENOMEM; 722b1e71b06SSteven Whitehouse flags |= AOP_FLAG_NOFS; 723b1e71b06SSteven Whitehouse page = grab_cache_page_write_begin(mapping, index, flags); 724b1e71b06SSteven Whitehouse *pagep = page; 725b1e71b06SSteven Whitehouse if (unlikely(!page)) 726b1e71b06SSteven Whitehouse goto out_endtrans; 727b1e71b06SSteven Whitehouse 728b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 729b1e71b06SSteven Whitehouse error = 0; 730235628c5SAndreas Gruenbacher if (pos + len > gfs2_max_stuffed_size(ip)) { 731b1e71b06SSteven Whitehouse error = gfs2_unstuff_dinode(ip, page); 732b1e71b06SSteven Whitehouse if (error == 0) 733b1e71b06SSteven Whitehouse goto prepare_write; 734b1e71b06SSteven Whitehouse } else if (!PageUptodate(page)) { 735b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 736b1e71b06SSteven Whitehouse } 737b1e71b06SSteven Whitehouse goto out; 738b1e71b06SSteven Whitehouse } 739b1e71b06SSteven Whitehouse 740b1e71b06SSteven Whitehouse prepare_write: 741ebdec241SChristoph Hellwig error = __block_write_begin(page, from, len, gfs2_block_map); 742b1e71b06SSteven Whitehouse out: 743b1e71b06SSteven Whitehouse if (error == 0) 744b1e71b06SSteven Whitehouse return 0; 745b1e71b06SSteven Whitehouse 7466c474f7bSMaxim unlock_page(page); 74709cbfeafSKirill A. Shutemov put_page(page); 74815c6fd97Snpiggin@suse.de 749ff8f33c8SSteven Whitehouse gfs2_trans_end(sdp); 7507b5747f4SAndreas Gruenbacher if (alloc_required) { 7517b5747f4SAndreas Gruenbacher gfs2_inplace_release(ip); 752b1e71b06SSteven Whitehouse if (pos + len > ip->i_inode.i_size) 753ff8f33c8SSteven Whitehouse gfs2_trim_blocks(&ip->i_inode); 7547b5747f4SAndreas Gruenbacher } 7557b5747f4SAndreas Gruenbacher goto out_qunlock; 756ff8f33c8SSteven Whitehouse 757b1e71b06SSteven Whitehouse out_endtrans: 758b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 759b1e71b06SSteven Whitehouse out_trans_fail: 7607b5747f4SAndreas Gruenbacher if (alloc_required) 761b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 762b1e71b06SSteven Whitehouse out_qunlock: 7637b5747f4SAndreas Gruenbacher if (alloc_required) 764b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 765b1e71b06SSteven Whitehouse out_unlock: 7661946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 7671946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 7681946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 7691946f70aSBenjamin Marzinski } 770b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 771b1e71b06SSteven Whitehouse out_uninit: 772b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 773b1e71b06SSteven Whitehouse return error; 774b1e71b06SSteven Whitehouse } 775b1e71b06SSteven Whitehouse 776b1e71b06SSteven Whitehouse /** 777b1e71b06SSteven Whitehouse * adjust_fs_space - Adjusts the free space available due to gfs2_grow 778b1e71b06SSteven Whitehouse * @inode: the rindex inode 779b1e71b06SSteven Whitehouse */ 780b1e71b06SSteven Whitehouse static void adjust_fs_space(struct inode *inode) 781b1e71b06SSteven Whitehouse { 782b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; 7831946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 7841946f70aSBenjamin Marzinski struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 785b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 786b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 7871946f70aSBenjamin Marzinski struct buffer_head *m_bh, *l_bh; 788b1e71b06SSteven Whitehouse u64 fs_total, new_free; 789b1e71b06SSteven Whitehouse 790b1e71b06SSteven Whitehouse /* Total up the file system space, according to the latest rindex. */ 791b1e71b06SSteven Whitehouse fs_total = gfs2_ri_total(sdp); 7921946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) 7931946f70aSBenjamin Marzinski return; 794b1e71b06SSteven Whitehouse 795b1e71b06SSteven Whitehouse spin_lock(&sdp->sd_statfs_spin); 7961946f70aSBenjamin Marzinski gfs2_statfs_change_in(m_sc, m_bh->b_data + 7971946f70aSBenjamin Marzinski sizeof(struct gfs2_dinode)); 798b1e71b06SSteven Whitehouse if (fs_total > (m_sc->sc_total + l_sc->sc_total)) 799b1e71b06SSteven Whitehouse new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); 800b1e71b06SSteven Whitehouse else 801b1e71b06SSteven Whitehouse new_free = 0; 802b1e71b06SSteven Whitehouse spin_unlock(&sdp->sd_statfs_spin); 803b1e71b06SSteven Whitehouse fs_warn(sdp, "File system extended by %llu blocks.\n", 804b1e71b06SSteven Whitehouse (unsigned long long)new_free); 805b1e71b06SSteven Whitehouse gfs2_statfs_change(sdp, new_free, new_free, 0); 8061946f70aSBenjamin Marzinski 8071946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) 8081946f70aSBenjamin Marzinski goto out; 8091946f70aSBenjamin Marzinski update_statfs(sdp, m_bh, l_bh); 8101946f70aSBenjamin Marzinski brelse(l_bh); 8111946f70aSBenjamin Marzinski out: 8121946f70aSBenjamin Marzinski brelse(m_bh); 813b1e71b06SSteven Whitehouse } 814b1e71b06SSteven Whitehouse 815b1e71b06SSteven Whitehouse /** 816b1e71b06SSteven Whitehouse * gfs2_stuffed_write_end - Write end for stuffed files 817b1e71b06SSteven Whitehouse * @inode: The inode 818b1e71b06SSteven Whitehouse * @dibh: The buffer_head containing the on-disk inode 819b1e71b06SSteven Whitehouse * @pos: The file position 820b1e71b06SSteven Whitehouse * @copied: How much was actually copied by the VFS 821b1e71b06SSteven Whitehouse * @page: The page 822b1e71b06SSteven Whitehouse * 823b1e71b06SSteven Whitehouse * This copies the data from the page into the inode block after 824b1e71b06SSteven Whitehouse * the inode data structure itself. 825b1e71b06SSteven Whitehouse * 826b1e71b06SSteven Whitehouse * Returns: errno 827b1e71b06SSteven Whitehouse */ 828b1e71b06SSteven Whitehouse static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, 829d6382a35SAndreas Gruenbacher loff_t pos, unsigned copied, 830b1e71b06SSteven Whitehouse struct page *page) 831b1e71b06SSteven Whitehouse { 832b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 833b1e71b06SSteven Whitehouse u64 to = pos + copied; 834b1e71b06SSteven Whitehouse void *kaddr; 835b1e71b06SSteven Whitehouse unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); 836b1e71b06SSteven Whitehouse 837d6382a35SAndreas Gruenbacher BUG_ON(pos + copied > gfs2_max_stuffed_size(ip)); 838235628c5SAndreas Gruenbacher 839d9349285SCong Wang kaddr = kmap_atomic(page); 840b1e71b06SSteven Whitehouse memcpy(buf + pos, kaddr + pos, copied); 841b1e71b06SSteven Whitehouse flush_dcache_page(page); 842d9349285SCong Wang kunmap_atomic(kaddr); 843b1e71b06SSteven Whitehouse 84443388b21SAl Viro WARN_ON(!PageUptodate(page)); 845b1e71b06SSteven Whitehouse unlock_page(page); 84609cbfeafSKirill A. Shutemov put_page(page); 847b1e71b06SSteven Whitehouse 848b1e71b06SSteven Whitehouse if (copied) { 849a2e0f799SSteven Whitehouse if (inode->i_size < to) 850b1e71b06SSteven Whitehouse i_size_write(inode, to); 851b1e71b06SSteven Whitehouse mark_inode_dirty(inode); 852b1e71b06SSteven Whitehouse } 853b1e71b06SSteven Whitehouse return copied; 854b1e71b06SSteven Whitehouse } 855b1e71b06SSteven Whitehouse 856b1e71b06SSteven Whitehouse /** 857b1e71b06SSteven Whitehouse * gfs2_write_end 858b1e71b06SSteven Whitehouse * @file: The file to write to 859b1e71b06SSteven Whitehouse * @mapping: The address space to write to 860b1e71b06SSteven Whitehouse * @pos: The file position 861b1e71b06SSteven Whitehouse * @len: The length of the data 8621272574bSFabian Frederick * @copied: How much was actually copied by the VFS 863b1e71b06SSteven Whitehouse * @page: The page that has been written 864b1e71b06SSteven Whitehouse * @fsdata: The fsdata (unused in GFS2) 865b1e71b06SSteven Whitehouse * 866d6382a35SAndreas Gruenbacher * The main write_end function for GFS2. We just put our locking around the VFS 867d6382a35SAndreas Gruenbacher * provided functions. 868b1e71b06SSteven Whitehouse * 869b1e71b06SSteven Whitehouse * Returns: errno 870b1e71b06SSteven Whitehouse */ 871b1e71b06SSteven Whitehouse 872b1e71b06SSteven Whitehouse static int gfs2_write_end(struct file *file, struct address_space *mapping, 873b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 874b1e71b06SSteven Whitehouse struct page *page, void *fsdata) 875b1e71b06SSteven Whitehouse { 876b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 877b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 878b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 8791946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 880b1e71b06SSteven Whitehouse struct buffer_head *dibh; 881b1e71b06SSteven Whitehouse int ret; 8820c901809SBenjamin Marzinski struct gfs2_trans *tr = current->journal_info; 8830c901809SBenjamin Marzinski BUG_ON(!tr); 884b1e71b06SSteven Whitehouse 885b1e71b06SSteven Whitehouse BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); 886b1e71b06SSteven Whitehouse 887b1e71b06SSteven Whitehouse ret = gfs2_meta_inode_buffer(ip, &dibh); 888d6382a35SAndreas Gruenbacher if (unlikely(ret)) 889d6382a35SAndreas Gruenbacher goto out; 890b1e71b06SSteven Whitehouse 891d6382a35SAndreas Gruenbacher if (gfs2_is_stuffed(ip)) { 892d6382a35SAndreas Gruenbacher ret = gfs2_stuffed_write_end(inode, dibh, pos, copied, page); 893d6382a35SAndreas Gruenbacher page = NULL; 894d6382a35SAndreas Gruenbacher goto out2; 895d6382a35SAndreas Gruenbacher } 896b1e71b06SSteven Whitehouse 897b1e71b06SSteven Whitehouse if (!gfs2_is_writeback(ip)) 89888b65ce5SAndreas Gruenbacher gfs2_page_add_databufs(ip, page, pos & ~PAGE_MASK, len); 899b1e71b06SSteven Whitehouse 900b1e71b06SSteven Whitehouse ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); 901d6382a35SAndreas Gruenbacher page = NULL; 9020c901809SBenjamin Marzinski if (tr->tr_num_buf_new) 9030c901809SBenjamin Marzinski __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 9040c901809SBenjamin Marzinski else 9050c901809SBenjamin Marzinski gfs2_trans_add_meta(ip->i_gl, dibh); 9060c901809SBenjamin Marzinski 907d6382a35SAndreas Gruenbacher out2: 9089ae3c6deSBenjamin Marzinski if (inode == sdp->sd_rindex) { 909b1e71b06SSteven Whitehouse adjust_fs_space(inode); 910ca9248d8SBob Peterson sdp->sd_rindex_uptodate = 0; 9119ae3c6deSBenjamin Marzinski } 912b1e71b06SSteven Whitehouse 913b1e71b06SSteven Whitehouse brelse(dibh); 914d6382a35SAndreas Gruenbacher out: 915d6382a35SAndreas Gruenbacher if (page) { 916d6382a35SAndreas Gruenbacher unlock_page(page); 917d6382a35SAndreas Gruenbacher put_page(page); 918d6382a35SAndreas Gruenbacher } 919deab72d3SBob Peterson gfs2_trans_end(sdp); 920b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 921b54e9a0bSBob Peterson if (ip->i_qadata && ip->i_qadata->qa_qd_num) 922b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 9231946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 9241946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 9251946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 9261946f70aSBenjamin Marzinski } 927b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 928b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 929b1e71b06SSteven Whitehouse return ret; 930b1e71b06SSteven Whitehouse } 931b1e71b06SSteven Whitehouse 932b1e71b06SSteven Whitehouse /** 933b9e03f18SBob Peterson * jdata_set_page_dirty - Page dirtying function 934b1e71b06SSteven Whitehouse * @page: The page to dirty 935b1e71b06SSteven Whitehouse * 936b1e71b06SSteven Whitehouse * Returns: 1 if it dirtyed the page, or 0 otherwise 937b1e71b06SSteven Whitehouse */ 938b1e71b06SSteven Whitehouse 939b9e03f18SBob Peterson static int jdata_set_page_dirty(struct page *page) 940b1e71b06SSteven Whitehouse { 941b1e71b06SSteven Whitehouse SetPageChecked(page); 942b1e71b06SSteven Whitehouse return __set_page_dirty_buffers(page); 943b1e71b06SSteven Whitehouse } 944b1e71b06SSteven Whitehouse 945b1e71b06SSteven Whitehouse /** 946b1e71b06SSteven Whitehouse * gfs2_bmap - Block map function 947b1e71b06SSteven Whitehouse * @mapping: Address space info 948b1e71b06SSteven Whitehouse * @lblock: The block to map 949b1e71b06SSteven Whitehouse * 950b1e71b06SSteven Whitehouse * Returns: The disk address for the block or 0 on hole or error 951b1e71b06SSteven Whitehouse */ 952b1e71b06SSteven Whitehouse 953b1e71b06SSteven Whitehouse static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) 954b1e71b06SSteven Whitehouse { 955b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 956b1e71b06SSteven Whitehouse struct gfs2_holder i_gh; 957b1e71b06SSteven Whitehouse sector_t dblock = 0; 958b1e71b06SSteven Whitehouse int error; 959b1e71b06SSteven Whitehouse 960b1e71b06SSteven Whitehouse error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 961b1e71b06SSteven Whitehouse if (error) 962b1e71b06SSteven Whitehouse return 0; 963b1e71b06SSteven Whitehouse 964b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 965b1e71b06SSteven Whitehouse dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); 966b1e71b06SSteven Whitehouse 967b1e71b06SSteven Whitehouse gfs2_glock_dq_uninit(&i_gh); 968b1e71b06SSteven Whitehouse 969b1e71b06SSteven Whitehouse return dblock; 970b1e71b06SSteven Whitehouse } 971b1e71b06SSteven Whitehouse 972b1e71b06SSteven Whitehouse static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) 973b1e71b06SSteven Whitehouse { 974b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 975b1e71b06SSteven Whitehouse 976b1e71b06SSteven Whitehouse lock_buffer(bh); 977b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 978b1e71b06SSteven Whitehouse clear_buffer_dirty(bh); 979b1e71b06SSteven Whitehouse bd = bh->b_private; 980b1e71b06SSteven Whitehouse if (bd) { 981c0752aa7SBob Peterson if (!list_empty(&bd->bd_list) && !buffer_pinned(bh)) 982c0752aa7SBob Peterson list_del_init(&bd->bd_list); 983b1e71b06SSteven Whitehouse else 98468cd4ce2SBob Peterson gfs2_remove_from_journal(bh, REMOVE_JDATA); 985b1e71b06SSteven Whitehouse } 986b1e71b06SSteven Whitehouse bh->b_bdev = NULL; 987b1e71b06SSteven Whitehouse clear_buffer_mapped(bh); 988b1e71b06SSteven Whitehouse clear_buffer_req(bh); 989b1e71b06SSteven Whitehouse clear_buffer_new(bh); 990b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 991b1e71b06SSteven Whitehouse unlock_buffer(bh); 992b1e71b06SSteven Whitehouse } 993b1e71b06SSteven Whitehouse 994d47992f8SLukas Czerner static void gfs2_invalidatepage(struct page *page, unsigned int offset, 995d47992f8SLukas Czerner unsigned int length) 996b1e71b06SSteven Whitehouse { 997b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 9985c0bb97cSLukas Czerner unsigned int stop = offset + length; 99909cbfeafSKirill A. Shutemov int partial_page = (offset || length < PAGE_SIZE); 1000b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 1001b1e71b06SSteven Whitehouse unsigned long pos = 0; 1002b1e71b06SSteven Whitehouse 1003b1e71b06SSteven Whitehouse BUG_ON(!PageLocked(page)); 10045c0bb97cSLukas Czerner if (!partial_page) 1005b1e71b06SSteven Whitehouse ClearPageChecked(page); 1006b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 1007b1e71b06SSteven Whitehouse goto out; 1008b1e71b06SSteven Whitehouse 1009b1e71b06SSteven Whitehouse bh = head = page_buffers(page); 1010b1e71b06SSteven Whitehouse do { 10115c0bb97cSLukas Czerner if (pos + bh->b_size > stop) 10125c0bb97cSLukas Czerner return; 10135c0bb97cSLukas Czerner 1014b1e71b06SSteven Whitehouse if (offset <= pos) 1015b1e71b06SSteven Whitehouse gfs2_discard(sdp, bh); 1016b1e71b06SSteven Whitehouse pos += bh->b_size; 1017b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1018b1e71b06SSteven Whitehouse } while (bh != head); 1019b1e71b06SSteven Whitehouse out: 10205c0bb97cSLukas Czerner if (!partial_page) 1021b1e71b06SSteven Whitehouse try_to_release_page(page, 0); 1022b1e71b06SSteven Whitehouse } 1023b1e71b06SSteven Whitehouse 1024b1e71b06SSteven Whitehouse /** 1025b1e71b06SSteven Whitehouse * gfs2_ok_for_dio - check that dio is valid on this file 1026b1e71b06SSteven Whitehouse * @ip: The inode 1027b1e71b06SSteven Whitehouse * @offset: The offset at which we are reading or writing 1028b1e71b06SSteven Whitehouse * 1029b1e71b06SSteven Whitehouse * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) 1030b1e71b06SSteven Whitehouse * 1 (to accept the i/o request) 1031b1e71b06SSteven Whitehouse */ 10326f673763SOmar Sandoval static int gfs2_ok_for_dio(struct gfs2_inode *ip, loff_t offset) 1033b1e71b06SSteven Whitehouse { 1034b1e71b06SSteven Whitehouse /* 1035b1e71b06SSteven Whitehouse * Should we return an error here? I can't see that O_DIRECT for 1036b1e71b06SSteven Whitehouse * a stuffed file makes any sense. For now we'll silently fall 1037b1e71b06SSteven Whitehouse * back to buffered I/O 1038b1e71b06SSteven Whitehouse */ 1039b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 1040b1e71b06SSteven Whitehouse return 0; 1041b1e71b06SSteven Whitehouse 1042b1e71b06SSteven Whitehouse if (offset >= i_size_read(&ip->i_inode)) 1043b1e71b06SSteven Whitehouse return 0; 1044b1e71b06SSteven Whitehouse return 1; 1045b1e71b06SSteven Whitehouse } 1046b1e71b06SSteven Whitehouse 1047b1e71b06SSteven Whitehouse 1048b1e71b06SSteven Whitehouse 1049c8b8e32dSChristoph Hellwig static ssize_t gfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 1050b1e71b06SSteven Whitehouse { 1051b1e71b06SSteven Whitehouse struct file *file = iocb->ki_filp; 1052b1e71b06SSteven Whitehouse struct inode *inode = file->f_mapping->host; 1053dfd11184SSteven Whitehouse struct address_space *mapping = inode->i_mapping; 1054b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1055c8b8e32dSChristoph Hellwig loff_t offset = iocb->ki_pos; 1056b1e71b06SSteven Whitehouse struct gfs2_holder gh; 1057b1e71b06SSteven Whitehouse int rv; 1058b1e71b06SSteven Whitehouse 1059b1e71b06SSteven Whitehouse /* 1060b1e71b06SSteven Whitehouse * Deferred lock, even if its a write, since we do no allocation 1061b1e71b06SSteven Whitehouse * on this path. All we need change is atime, and this lock mode 1062b1e71b06SSteven Whitehouse * ensures that other nodes have flushed their buffered read caches 1063b1e71b06SSteven Whitehouse * (i.e. their page cache entries for this inode). We do not, 1064b1e71b06SSteven Whitehouse * unfortunately have the option of only flushing a range like 1065b1e71b06SSteven Whitehouse * the VFS does. 1066b1e71b06SSteven Whitehouse */ 1067b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); 1068b1e71b06SSteven Whitehouse rv = gfs2_glock_nq(&gh); 1069b1e71b06SSteven Whitehouse if (rv) 10709c7fe835SDaniel DeFreez goto out_uninit; 10716f673763SOmar Sandoval rv = gfs2_ok_for_dio(ip, offset); 1072b1e71b06SSteven Whitehouse if (rv != 1) 1073b1e71b06SSteven Whitehouse goto out; /* dio not valid, fall back to buffered i/o */ 1074b1e71b06SSteven Whitehouse 1075dfd11184SSteven Whitehouse /* 1076dfd11184SSteven Whitehouse * Now since we are holding a deferred (CW) lock at this point, you 1077dfd11184SSteven Whitehouse * might be wondering why this is ever needed. There is a case however 1078dfd11184SSteven Whitehouse * where we've granted a deferred local lock against a cached exclusive 1079dfd11184SSteven Whitehouse * glock. That is ok provided all granted local locks are deferred, but 1080dfd11184SSteven Whitehouse * it also means that it is possible to encounter pages which are 1081dfd11184SSteven Whitehouse * cached and possibly also mapped. So here we check for that and sort 1082dfd11184SSteven Whitehouse * them out ahead of the dio. The glock state machine will take care of 1083dfd11184SSteven Whitehouse * everything else. 1084dfd11184SSteven Whitehouse * 1085dfd11184SSteven Whitehouse * If in fact the cached glock state (gl->gl_state) is deferred (CW) in 1086dfd11184SSteven Whitehouse * the first place, mapping->nr_pages will always be zero. 1087dfd11184SSteven Whitehouse */ 1088dfd11184SSteven Whitehouse if (mapping->nrpages) { 108909cbfeafSKirill A. Shutemov loff_t lstart = offset & ~(PAGE_SIZE - 1); 1090a6cbcd4aSAl Viro loff_t len = iov_iter_count(iter); 1091dfd11184SSteven Whitehouse loff_t end = PAGE_ALIGN(offset + len) - 1; 1092dfd11184SSteven Whitehouse 1093dfd11184SSteven Whitehouse rv = 0; 1094dfd11184SSteven Whitehouse if (len == 0) 1095dfd11184SSteven Whitehouse goto out; 1096dfd11184SSteven Whitehouse if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags)) 1097dfd11184SSteven Whitehouse unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len); 1098dfd11184SSteven Whitehouse rv = filemap_write_and_wait_range(mapping, lstart, end); 1099dfd11184SSteven Whitehouse if (rv) 1100086352f1SSteven Whitehouse goto out; 11016f673763SOmar Sandoval if (iov_iter_rw(iter) == WRITE) 1102dfd11184SSteven Whitehouse truncate_inode_pages_range(mapping, lstart, end); 1103dfd11184SSteven Whitehouse } 1104dfd11184SSteven Whitehouse 110517f8c842SOmar Sandoval rv = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, 1106c8b8e32dSChristoph Hellwig gfs2_get_block_direct, NULL, NULL, 0); 1107b1e71b06SSteven Whitehouse out: 11088e711e10SBob Peterson gfs2_glock_dq(&gh); 11099c7fe835SDaniel DeFreez out_uninit: 1110b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 1111b1e71b06SSteven Whitehouse return rv; 1112b1e71b06SSteven Whitehouse } 1113b1e71b06SSteven Whitehouse 1114b1e71b06SSteven Whitehouse /** 1115b1e71b06SSteven Whitehouse * gfs2_releasepage - free the metadata associated with a page 1116b1e71b06SSteven Whitehouse * @page: the page that's being released 1117b1e71b06SSteven Whitehouse * @gfp_mask: passed from Linux VFS, ignored by us 1118b1e71b06SSteven Whitehouse * 1119b1e71b06SSteven Whitehouse * Call try_to_free_buffers() if the buffers in this page can be 1120b1e71b06SSteven Whitehouse * released. 1121b1e71b06SSteven Whitehouse * 1122b1e71b06SSteven Whitehouse * Returns: 0 1123b1e71b06SSteven Whitehouse */ 1124b1e71b06SSteven Whitehouse 1125b1e71b06SSteven Whitehouse int gfs2_releasepage(struct page *page, gfp_t gfp_mask) 1126b1e71b06SSteven Whitehouse { 1127009d8518SSteven Whitehouse struct address_space *mapping = page->mapping; 1128009d8518SSteven Whitehouse struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 1129b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 1130b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 1131b1e71b06SSteven Whitehouse 1132b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 1133b1e71b06SSteven Whitehouse return 0; 1134b1e71b06SSteven Whitehouse 11351c185c02SAndreas Gruenbacher /* 11361c185c02SAndreas Gruenbacher * From xfs_vm_releasepage: mm accommodates an old ext3 case where 11371c185c02SAndreas Gruenbacher * clean pages might not have had the dirty bit cleared. Thus, it can 11381c185c02SAndreas Gruenbacher * send actual dirty pages to ->releasepage() via shrink_active_list(). 11391c185c02SAndreas Gruenbacher * 11401c185c02SAndreas Gruenbacher * As a workaround, we skip pages that contain dirty buffers below. 11411c185c02SAndreas Gruenbacher * Once ->releasepage isn't called on dirty pages anymore, we can warn 11421c185c02SAndreas Gruenbacher * on dirty buffers like we used to here again. 11431c185c02SAndreas Gruenbacher */ 11441c185c02SAndreas Gruenbacher 1145b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 1146380f7c65SSteven Whitehouse spin_lock(&sdp->sd_ail_lock); 1147b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1148b1e71b06SSteven Whitehouse do { 1149b1e71b06SSteven Whitehouse if (atomic_read(&bh->b_count)) 1150b1e71b06SSteven Whitehouse goto cannot_release; 1151b1e71b06SSteven Whitehouse bd = bh->b_private; 115216ca9412SBenjamin Marzinski if (bd && bd->bd_tr) 1153b1e71b06SSteven Whitehouse goto cannot_release; 11541c185c02SAndreas Gruenbacher if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh))) 11551c185c02SAndreas Gruenbacher goto cannot_release; 1156b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1157b1e71b06SSteven Whitehouse } while(bh != head); 1158380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 1159b1e71b06SSteven Whitehouse 1160b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1161b1e71b06SSteven Whitehouse do { 1162b1e71b06SSteven Whitehouse bd = bh->b_private; 1163b1e71b06SSteven Whitehouse if (bd) { 1164b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, bd->bd_bh == bh); 1165e4f29206SSteven Whitehouse if (!list_empty(&bd->bd_list)) 1166c0752aa7SBob Peterson list_del_init(&bd->bd_list); 1167b1e71b06SSteven Whitehouse bd->bd_bh = NULL; 1168b1e71b06SSteven Whitehouse bh->b_private = NULL; 1169b1e71b06SSteven Whitehouse kmem_cache_free(gfs2_bufdata_cachep, bd); 1170e4f29206SSteven Whitehouse } 1171b1e71b06SSteven Whitehouse 1172b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1173b1e71b06SSteven Whitehouse } while (bh != head); 1174e4f29206SSteven Whitehouse gfs2_log_unlock(sdp); 1175b1e71b06SSteven Whitehouse 1176b1e71b06SSteven Whitehouse return try_to_free_buffers(page); 11778f065d36SSteven Whitehouse 1178b1e71b06SSteven Whitehouse cannot_release: 1179380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 1180b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1181b1e71b06SSteven Whitehouse return 0; 1182b1e71b06SSteven Whitehouse } 1183b1e71b06SSteven Whitehouse 1184b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_writeback_aops = { 11859d358143SSteven Whitehouse .writepage = gfs2_writepage, 118645138990SSteven Whitehouse .writepages = gfs2_writepages, 1187b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1188b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1189b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1190b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1191b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1192b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1193b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1194b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1195b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1196b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1197aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1198b1e71b06SSteven Whitehouse }; 1199b1e71b06SSteven Whitehouse 1200b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_ordered_aops = { 12019d358143SSteven Whitehouse .writepage = gfs2_writepage, 120245138990SSteven Whitehouse .writepages = gfs2_writepages, 1203b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1204b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1205b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1206b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1207b9e03f18SBob Peterson .set_page_dirty = __set_page_dirty_buffers, 1208b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1209b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1210b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1211b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1212b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1213b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1214aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1215b1e71b06SSteven Whitehouse }; 1216b1e71b06SSteven Whitehouse 1217b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_jdata_aops = { 1218b1e71b06SSteven Whitehouse .writepage = gfs2_jdata_writepage, 1219b1e71b06SSteven Whitehouse .writepages = gfs2_jdata_writepages, 1220b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1221b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1222b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1223b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1224b9e03f18SBob Peterson .set_page_dirty = jdata_set_page_dirty, 1225b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1226b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1227b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1228b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1229aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1230b1e71b06SSteven Whitehouse }; 1231b1e71b06SSteven Whitehouse 1232b1e71b06SSteven Whitehouse void gfs2_set_aops(struct inode *inode) 1233b1e71b06SSteven Whitehouse { 1234b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1235b1e71b06SSteven Whitehouse 1236b1e71b06SSteven Whitehouse if (gfs2_is_writeback(ip)) 1237b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_writeback_aops; 1238b1e71b06SSteven Whitehouse else if (gfs2_is_ordered(ip)) 1239b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_ordered_aops; 1240b1e71b06SSteven Whitehouse else if (gfs2_is_jdata(ip)) 1241b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_jdata_aops; 1242b1e71b06SSteven Whitehouse else 1243b1e71b06SSteven Whitehouse BUG(); 1244b1e71b06SSteven Whitehouse } 1245b1e71b06SSteven Whitehouse 1246