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> 23b1e71b06SSteven Whitehouse 24b1e71b06SSteven Whitehouse #include "gfs2.h" 25b1e71b06SSteven Whitehouse #include "incore.h" 26b1e71b06SSteven Whitehouse #include "bmap.h" 27b1e71b06SSteven Whitehouse #include "glock.h" 28b1e71b06SSteven Whitehouse #include "inode.h" 29b1e71b06SSteven Whitehouse #include "log.h" 30b1e71b06SSteven Whitehouse #include "meta_io.h" 31b1e71b06SSteven Whitehouse #include "quota.h" 32b1e71b06SSteven Whitehouse #include "trans.h" 33b1e71b06SSteven Whitehouse #include "rgrp.h" 34b1e71b06SSteven Whitehouse #include "super.h" 35b1e71b06SSteven Whitehouse #include "util.h" 36b1e71b06SSteven Whitehouse #include "glops.h" 37b1e71b06SSteven Whitehouse 38b1e71b06SSteven Whitehouse 39b120193eSBob Peterson static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, 40b1e71b06SSteven Whitehouse unsigned int from, unsigned int to) 41b1e71b06SSteven Whitehouse { 42b1e71b06SSteven Whitehouse struct buffer_head *head = page_buffers(page); 43b1e71b06SSteven Whitehouse unsigned int bsize = head->b_size; 44b1e71b06SSteven Whitehouse struct buffer_head *bh; 45b1e71b06SSteven Whitehouse unsigned int start, end; 46b1e71b06SSteven Whitehouse 47b1e71b06SSteven Whitehouse for (bh = head, start = 0; bh != head || !start; 48b1e71b06SSteven Whitehouse bh = bh->b_this_page, start = end) { 49b1e71b06SSteven Whitehouse end = start + bsize; 50b1e71b06SSteven Whitehouse if (end <= from || start >= to) 51b1e71b06SSteven Whitehouse continue; 52b1e71b06SSteven Whitehouse if (gfs2_is_jdata(ip)) 53b1e71b06SSteven Whitehouse set_buffer_uptodate(bh); 54350a9b0aSSteven Whitehouse gfs2_trans_add_data(ip->i_gl, bh); 55b1e71b06SSteven Whitehouse } 56b1e71b06SSteven Whitehouse } 57b1e71b06SSteven Whitehouse 58b1e71b06SSteven Whitehouse /** 59b1e71b06SSteven Whitehouse * gfs2_get_block_noalloc - Fills in a buffer head with details about a block 60b1e71b06SSteven Whitehouse * @inode: The inode 61b1e71b06SSteven Whitehouse * @lblock: The block number to look up 62b1e71b06SSteven Whitehouse * @bh_result: The buffer head to return the result in 63b1e71b06SSteven Whitehouse * @create: Non-zero if we may add block to the file 64b1e71b06SSteven Whitehouse * 65b1e71b06SSteven Whitehouse * Returns: errno 66b1e71b06SSteven Whitehouse */ 67b1e71b06SSteven Whitehouse 68b1e71b06SSteven Whitehouse static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, 69b1e71b06SSteven Whitehouse struct buffer_head *bh_result, int create) 70b1e71b06SSteven Whitehouse { 71b1e71b06SSteven Whitehouse int error; 72b1e71b06SSteven Whitehouse 73b1e71b06SSteven Whitehouse error = gfs2_block_map(inode, lblock, bh_result, 0); 74b1e71b06SSteven Whitehouse if (error) 75b1e71b06SSteven Whitehouse return error; 76b1e71b06SSteven Whitehouse if (!buffer_mapped(bh_result)) 77b1e71b06SSteven Whitehouse return -EIO; 78b1e71b06SSteven Whitehouse return 0; 79b1e71b06SSteven Whitehouse } 80b1e71b06SSteven Whitehouse 81b1e71b06SSteven Whitehouse static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, 82b1e71b06SSteven Whitehouse struct buffer_head *bh_result, int create) 83b1e71b06SSteven Whitehouse { 84b1e71b06SSteven Whitehouse return gfs2_block_map(inode, lblock, bh_result, 0); 85b1e71b06SSteven Whitehouse } 86b1e71b06SSteven Whitehouse 87b1e71b06SSteven Whitehouse /** 88b1e71b06SSteven Whitehouse * gfs2_writepage_common - Common bits of writepage 89b1e71b06SSteven Whitehouse * @page: The page to be written 90b1e71b06SSteven Whitehouse * @wbc: The writeback control 91b1e71b06SSteven Whitehouse * 92b1e71b06SSteven Whitehouse * Returns: 1 if writepage is ok, otherwise an error code or zero if no error. 93b1e71b06SSteven Whitehouse */ 94b1e71b06SSteven Whitehouse 95b1e71b06SSteven Whitehouse static int gfs2_writepage_common(struct page *page, 96b1e71b06SSteven Whitehouse struct writeback_control *wbc) 97b1e71b06SSteven Whitehouse { 98b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 99b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 100b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 101b1e71b06SSteven Whitehouse loff_t i_size = i_size_read(inode); 102b1e71b06SSteven Whitehouse pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; 103b1e71b06SSteven Whitehouse unsigned offset; 104b1e71b06SSteven Whitehouse 105b1e71b06SSteven Whitehouse if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 106b1e71b06SSteven Whitehouse goto out; 107b1e71b06SSteven Whitehouse if (current->journal_info) 108b1e71b06SSteven Whitehouse goto redirty; 109b1e71b06SSteven Whitehouse /* Is the page fully outside i_size? (truncate in progress) */ 110b1e71b06SSteven Whitehouse offset = i_size & (PAGE_CACHE_SIZE-1); 111b1e71b06SSteven Whitehouse if (page->index > end_index || (page->index == end_index && !offset)) { 112b1e71b06SSteven Whitehouse page->mapping->a_ops->invalidatepage(page, 0); 113b1e71b06SSteven Whitehouse goto out; 114b1e71b06SSteven Whitehouse } 115b1e71b06SSteven Whitehouse return 1; 116b1e71b06SSteven Whitehouse redirty: 117b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 118b1e71b06SSteven Whitehouse out: 119b1e71b06SSteven Whitehouse unlock_page(page); 120b1e71b06SSteven Whitehouse return 0; 121b1e71b06SSteven Whitehouse } 122b1e71b06SSteven Whitehouse 123b1e71b06SSteven Whitehouse /** 124b1e71b06SSteven Whitehouse * gfs2_writeback_writepage - Write page for writeback mappings 125b1e71b06SSteven Whitehouse * @page: The page 126b1e71b06SSteven Whitehouse * @wbc: The writeback control 127b1e71b06SSteven Whitehouse * 128b1e71b06SSteven Whitehouse */ 129b1e71b06SSteven Whitehouse 130b1e71b06SSteven Whitehouse static int gfs2_writeback_writepage(struct page *page, 131b1e71b06SSteven Whitehouse struct writeback_control *wbc) 132b1e71b06SSteven Whitehouse { 133b1e71b06SSteven Whitehouse int ret; 134b1e71b06SSteven Whitehouse 135b1e71b06SSteven Whitehouse ret = gfs2_writepage_common(page, wbc); 136b1e71b06SSteven Whitehouse if (ret <= 0) 137b1e71b06SSteven Whitehouse return ret; 138b1e71b06SSteven Whitehouse 13930116ff6SSteven Whitehouse return nobh_writepage(page, gfs2_get_block_noalloc, wbc); 140b1e71b06SSteven Whitehouse } 141b1e71b06SSteven Whitehouse 142b1e71b06SSteven Whitehouse /** 143b1e71b06SSteven Whitehouse * gfs2_ordered_writepage - Write page for ordered data files 144b1e71b06SSteven Whitehouse * @page: The page to write 145b1e71b06SSteven Whitehouse * @wbc: The writeback control 146b1e71b06SSteven Whitehouse * 147b1e71b06SSteven Whitehouse */ 148b1e71b06SSteven Whitehouse 149b1e71b06SSteven Whitehouse static int gfs2_ordered_writepage(struct page *page, 150b1e71b06SSteven Whitehouse struct writeback_control *wbc) 151b1e71b06SSteven Whitehouse { 152b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 153b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 154b1e71b06SSteven Whitehouse int ret; 155b1e71b06SSteven Whitehouse 156b1e71b06SSteven Whitehouse ret = gfs2_writepage_common(page, wbc); 157b1e71b06SSteven Whitehouse if (ret <= 0) 158b1e71b06SSteven Whitehouse return ret; 159b1e71b06SSteven Whitehouse 160b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) { 161b1e71b06SSteven Whitehouse create_empty_buffers(page, inode->i_sb->s_blocksize, 162b1e71b06SSteven Whitehouse (1 << BH_Dirty)|(1 << BH_Uptodate)); 163b1e71b06SSteven Whitehouse } 164b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, 0, inode->i_sb->s_blocksize-1); 165b1e71b06SSteven Whitehouse return block_write_full_page(page, gfs2_get_block_noalloc, wbc); 166b1e71b06SSteven Whitehouse } 167b1e71b06SSteven Whitehouse 168b1e71b06SSteven Whitehouse /** 169b1e71b06SSteven Whitehouse * __gfs2_jdata_writepage - The core of jdata writepage 170b1e71b06SSteven Whitehouse * @page: The page to write 171b1e71b06SSteven Whitehouse * @wbc: The writeback control 172b1e71b06SSteven Whitehouse * 173b1e71b06SSteven Whitehouse * This is shared between writepage and writepages and implements the 174b1e71b06SSteven Whitehouse * core of the writepage operation. If a transaction is required then 175b1e71b06SSteven Whitehouse * PageChecked will have been set and the transaction will have 176b1e71b06SSteven Whitehouse * already been started before this is called. 177b1e71b06SSteven Whitehouse */ 178b1e71b06SSteven Whitehouse 179b1e71b06SSteven Whitehouse static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 180b1e71b06SSteven Whitehouse { 181b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 182b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 183b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 184b1e71b06SSteven Whitehouse 185b1e71b06SSteven Whitehouse if (PageChecked(page)) { 186b1e71b06SSteven Whitehouse ClearPageChecked(page); 187b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) { 188b1e71b06SSteven Whitehouse create_empty_buffers(page, inode->i_sb->s_blocksize, 189b1e71b06SSteven Whitehouse (1 << BH_Dirty)|(1 << BH_Uptodate)); 190b1e71b06SSteven Whitehouse } 191b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); 192b1e71b06SSteven Whitehouse } 193b1e71b06SSteven Whitehouse return block_write_full_page(page, gfs2_get_block_noalloc, wbc); 194b1e71b06SSteven Whitehouse } 195b1e71b06SSteven Whitehouse 196b1e71b06SSteven Whitehouse /** 197b1e71b06SSteven Whitehouse * gfs2_jdata_writepage - Write complete page 198b1e71b06SSteven Whitehouse * @page: Page to write 199b1e71b06SSteven Whitehouse * 200b1e71b06SSteven Whitehouse * Returns: errno 201b1e71b06SSteven Whitehouse * 202b1e71b06SSteven Whitehouse */ 203b1e71b06SSteven Whitehouse 204b1e71b06SSteven Whitehouse static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 205b1e71b06SSteven Whitehouse { 206b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 207b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 208b1e71b06SSteven Whitehouse int ret; 209b1e71b06SSteven Whitehouse int done_trans = 0; 210b1e71b06SSteven Whitehouse 211b1e71b06SSteven Whitehouse if (PageChecked(page)) { 212b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_ALL) 213b1e71b06SSteven Whitehouse goto out_ignore; 214b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); 215b1e71b06SSteven Whitehouse if (ret) 216b1e71b06SSteven Whitehouse goto out_ignore; 217b1e71b06SSteven Whitehouse done_trans = 1; 218b1e71b06SSteven Whitehouse } 219b1e71b06SSteven Whitehouse ret = gfs2_writepage_common(page, wbc); 220b1e71b06SSteven Whitehouse if (ret > 0) 221b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 222b1e71b06SSteven Whitehouse if (done_trans) 223b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 224b1e71b06SSteven Whitehouse return ret; 225b1e71b06SSteven Whitehouse 226b1e71b06SSteven Whitehouse out_ignore: 227b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 228b1e71b06SSteven Whitehouse unlock_page(page); 229b1e71b06SSteven Whitehouse return 0; 230b1e71b06SSteven Whitehouse } 231b1e71b06SSteven Whitehouse 232b1e71b06SSteven Whitehouse /** 23345138990SSteven Whitehouse * gfs2_writepages - Write a bunch of dirty pages back to disk 234b1e71b06SSteven Whitehouse * @mapping: The mapping to write 235b1e71b06SSteven Whitehouse * @wbc: Write-back control 236b1e71b06SSteven Whitehouse * 23745138990SSteven Whitehouse * Used for both ordered and writeback modes. 238b1e71b06SSteven Whitehouse */ 23945138990SSteven Whitehouse static int gfs2_writepages(struct address_space *mapping, 240b1e71b06SSteven Whitehouse struct writeback_control *wbc) 241b1e71b06SSteven Whitehouse { 242b1e71b06SSteven Whitehouse return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); 243b1e71b06SSteven Whitehouse } 244b1e71b06SSteven Whitehouse 245b1e71b06SSteven Whitehouse /** 246b1e71b06SSteven Whitehouse * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages 247b1e71b06SSteven Whitehouse * @mapping: The mapping 248b1e71b06SSteven Whitehouse * @wbc: The writeback control 249b1e71b06SSteven Whitehouse * @writepage: The writepage function to call for each page 250b1e71b06SSteven Whitehouse * @pvec: The vector of pages 251b1e71b06SSteven Whitehouse * @nr_pages: The number of pages to write 252b1e71b06SSteven Whitehouse * 253b1e71b06SSteven Whitehouse * Returns: non-zero if loop should terminate, zero otherwise 254b1e71b06SSteven Whitehouse */ 255b1e71b06SSteven Whitehouse 256b1e71b06SSteven Whitehouse static int gfs2_write_jdata_pagevec(struct address_space *mapping, 257b1e71b06SSteven Whitehouse struct writeback_control *wbc, 258b1e71b06SSteven Whitehouse struct pagevec *pvec, 259b1e71b06SSteven Whitehouse int nr_pages, pgoff_t end) 260b1e71b06SSteven Whitehouse { 261b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 262b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 263b1e71b06SSteven Whitehouse loff_t i_size = i_size_read(inode); 264b1e71b06SSteven Whitehouse pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; 265b1e71b06SSteven Whitehouse unsigned offset = i_size & (PAGE_CACHE_SIZE-1); 266b1e71b06SSteven Whitehouse unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize); 267b1e71b06SSteven Whitehouse int i; 268b1e71b06SSteven Whitehouse int ret; 269b1e71b06SSteven Whitehouse 270b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); 271b1e71b06SSteven Whitehouse if (ret < 0) 272b1e71b06SSteven Whitehouse return ret; 273b1e71b06SSteven Whitehouse 274b1e71b06SSteven Whitehouse for(i = 0; i < nr_pages; i++) { 275b1e71b06SSteven Whitehouse struct page *page = pvec->pages[i]; 276b1e71b06SSteven Whitehouse 277b1e71b06SSteven Whitehouse lock_page(page); 278b1e71b06SSteven Whitehouse 279b1e71b06SSteven Whitehouse if (unlikely(page->mapping != mapping)) { 280b1e71b06SSteven Whitehouse unlock_page(page); 281b1e71b06SSteven Whitehouse continue; 282b1e71b06SSteven Whitehouse } 283b1e71b06SSteven Whitehouse 284b1e71b06SSteven Whitehouse if (!wbc->range_cyclic && page->index > end) { 285b1e71b06SSteven Whitehouse ret = 1; 286b1e71b06SSteven Whitehouse unlock_page(page); 287b1e71b06SSteven Whitehouse continue; 288b1e71b06SSteven Whitehouse } 289b1e71b06SSteven Whitehouse 290b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_NONE) 291b1e71b06SSteven Whitehouse wait_on_page_writeback(page); 292b1e71b06SSteven Whitehouse 293b1e71b06SSteven Whitehouse if (PageWriteback(page) || 294b1e71b06SSteven Whitehouse !clear_page_dirty_for_io(page)) { 295b1e71b06SSteven Whitehouse unlock_page(page); 296b1e71b06SSteven Whitehouse continue; 297b1e71b06SSteven Whitehouse } 298b1e71b06SSteven Whitehouse 299b1e71b06SSteven Whitehouse /* Is the page fully outside i_size? (truncate in progress) */ 300b1e71b06SSteven Whitehouse if (page->index > end_index || (page->index == end_index && !offset)) { 301b1e71b06SSteven Whitehouse page->mapping->a_ops->invalidatepage(page, 0); 302b1e71b06SSteven Whitehouse unlock_page(page); 303b1e71b06SSteven Whitehouse continue; 304b1e71b06SSteven Whitehouse } 305b1e71b06SSteven Whitehouse 306b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 307b1e71b06SSteven Whitehouse 308b1e71b06SSteven Whitehouse if (ret || (--(wbc->nr_to_write) <= 0)) 309b1e71b06SSteven Whitehouse ret = 1; 310b1e71b06SSteven Whitehouse } 311b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 312b1e71b06SSteven Whitehouse return ret; 313b1e71b06SSteven Whitehouse } 314b1e71b06SSteven Whitehouse 315b1e71b06SSteven Whitehouse /** 316b1e71b06SSteven Whitehouse * gfs2_write_cache_jdata - Like write_cache_pages but different 317b1e71b06SSteven Whitehouse * @mapping: The mapping to write 318b1e71b06SSteven Whitehouse * @wbc: The writeback control 319b1e71b06SSteven Whitehouse * @writepage: The writepage function to call 320b1e71b06SSteven Whitehouse * @data: The data to pass to writepage 321b1e71b06SSteven Whitehouse * 322b1e71b06SSteven Whitehouse * The reason that we use our own function here is that we need to 323b1e71b06SSteven Whitehouse * start transactions before we grab page locks. This allows us 324b1e71b06SSteven Whitehouse * to get the ordering right. 325b1e71b06SSteven Whitehouse */ 326b1e71b06SSteven Whitehouse 327b1e71b06SSteven Whitehouse static int gfs2_write_cache_jdata(struct address_space *mapping, 328b1e71b06SSteven Whitehouse struct writeback_control *wbc) 329b1e71b06SSteven Whitehouse { 330b1e71b06SSteven Whitehouse int ret = 0; 331b1e71b06SSteven Whitehouse int done = 0; 332b1e71b06SSteven Whitehouse struct pagevec pvec; 333b1e71b06SSteven Whitehouse int nr_pages; 334b1e71b06SSteven Whitehouse pgoff_t index; 335b1e71b06SSteven Whitehouse pgoff_t end; 336b1e71b06SSteven Whitehouse int scanned = 0; 337b1e71b06SSteven Whitehouse int range_whole = 0; 338b1e71b06SSteven Whitehouse 339b1e71b06SSteven Whitehouse pagevec_init(&pvec, 0); 340b1e71b06SSteven Whitehouse if (wbc->range_cyclic) { 341b1e71b06SSteven Whitehouse index = mapping->writeback_index; /* Start from prev offset */ 342b1e71b06SSteven Whitehouse end = -1; 343b1e71b06SSteven Whitehouse } else { 344b1e71b06SSteven Whitehouse index = wbc->range_start >> PAGE_CACHE_SHIFT; 345b1e71b06SSteven Whitehouse end = wbc->range_end >> PAGE_CACHE_SHIFT; 346b1e71b06SSteven Whitehouse if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 347b1e71b06SSteven Whitehouse range_whole = 1; 348b1e71b06SSteven Whitehouse scanned = 1; 349b1e71b06SSteven Whitehouse } 350b1e71b06SSteven Whitehouse 351b1e71b06SSteven Whitehouse retry: 352b1e71b06SSteven Whitehouse while (!done && (index <= end) && 353b1e71b06SSteven Whitehouse (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, 354b1e71b06SSteven Whitehouse PAGECACHE_TAG_DIRTY, 355b1e71b06SSteven Whitehouse min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { 356b1e71b06SSteven Whitehouse scanned = 1; 357b1e71b06SSteven Whitehouse ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end); 358b1e71b06SSteven Whitehouse if (ret) 359b1e71b06SSteven Whitehouse done = 1; 360b1e71b06SSteven Whitehouse if (ret > 0) 361b1e71b06SSteven Whitehouse ret = 0; 362b1e71b06SSteven Whitehouse 363b1e71b06SSteven Whitehouse pagevec_release(&pvec); 364b1e71b06SSteven Whitehouse cond_resched(); 365b1e71b06SSteven Whitehouse } 366b1e71b06SSteven Whitehouse 367b1e71b06SSteven Whitehouse if (!scanned && !done) { 368b1e71b06SSteven Whitehouse /* 369b1e71b06SSteven Whitehouse * We hit the last page and there is more work to be done: wrap 370b1e71b06SSteven Whitehouse * back to the start of the file 371b1e71b06SSteven Whitehouse */ 372b1e71b06SSteven Whitehouse scanned = 1; 373b1e71b06SSteven Whitehouse index = 0; 374b1e71b06SSteven Whitehouse goto retry; 375b1e71b06SSteven Whitehouse } 376b1e71b06SSteven Whitehouse 377b1e71b06SSteven Whitehouse if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 378b1e71b06SSteven Whitehouse mapping->writeback_index = index; 379b1e71b06SSteven Whitehouse return ret; 380b1e71b06SSteven Whitehouse } 381b1e71b06SSteven Whitehouse 382b1e71b06SSteven Whitehouse 383b1e71b06SSteven Whitehouse /** 384b1e71b06SSteven Whitehouse * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk 385b1e71b06SSteven Whitehouse * @mapping: The mapping to write 386b1e71b06SSteven Whitehouse * @wbc: The writeback control 387b1e71b06SSteven Whitehouse * 388b1e71b06SSteven Whitehouse */ 389b1e71b06SSteven Whitehouse 390b1e71b06SSteven Whitehouse static int gfs2_jdata_writepages(struct address_space *mapping, 391b1e71b06SSteven Whitehouse struct writeback_control *wbc) 392b1e71b06SSteven Whitehouse { 393b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 394b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 395b1e71b06SSteven Whitehouse int ret; 396b1e71b06SSteven Whitehouse 397b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 398b1e71b06SSteven Whitehouse if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { 399b1e71b06SSteven Whitehouse gfs2_log_flush(sdp, ip->i_gl); 400b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 401b1e71b06SSteven Whitehouse } 402b1e71b06SSteven Whitehouse return ret; 403b1e71b06SSteven Whitehouse } 404b1e71b06SSteven Whitehouse 405b1e71b06SSteven Whitehouse /** 406b1e71b06SSteven Whitehouse * stuffed_readpage - Fill in a Linux page with stuffed file data 407b1e71b06SSteven Whitehouse * @ip: the inode 408b1e71b06SSteven Whitehouse * @page: the page 409b1e71b06SSteven Whitehouse * 410b1e71b06SSteven Whitehouse * Returns: errno 411b1e71b06SSteven Whitehouse */ 412b1e71b06SSteven Whitehouse 413b1e71b06SSteven Whitehouse static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) 414b1e71b06SSteven Whitehouse { 415b1e71b06SSteven Whitehouse struct buffer_head *dibh; 416602c89d2SSteven Whitehouse u64 dsize = i_size_read(&ip->i_inode); 417b1e71b06SSteven Whitehouse void *kaddr; 418b1e71b06SSteven Whitehouse int error; 419b1e71b06SSteven Whitehouse 420b1e71b06SSteven Whitehouse /* 421b1e71b06SSteven Whitehouse * Due to the order of unstuffing files and ->fault(), we can be 422b1e71b06SSteven Whitehouse * asked for a zero page in the case of a stuffed file being extended, 423b1e71b06SSteven Whitehouse * so we need to supply one here. It doesn't happen often. 424b1e71b06SSteven Whitehouse */ 425b1e71b06SSteven Whitehouse if (unlikely(page->index)) { 426b1e71b06SSteven Whitehouse zero_user(page, 0, PAGE_CACHE_SIZE); 427b1e71b06SSteven Whitehouse SetPageUptodate(page); 428b1e71b06SSteven Whitehouse return 0; 429b1e71b06SSteven Whitehouse } 430b1e71b06SSteven Whitehouse 431b1e71b06SSteven Whitehouse error = gfs2_meta_inode_buffer(ip, &dibh); 432b1e71b06SSteven Whitehouse if (error) 433b1e71b06SSteven Whitehouse return error; 434b1e71b06SSteven Whitehouse 435d9349285SCong Wang kaddr = kmap_atomic(page); 436602c89d2SSteven Whitehouse if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode))) 437602c89d2SSteven Whitehouse dsize = (dibh->b_size - sizeof(struct gfs2_dinode)); 438602c89d2SSteven Whitehouse memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); 439602c89d2SSteven Whitehouse memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize); 440d9349285SCong Wang kunmap_atomic(kaddr); 441b1e71b06SSteven Whitehouse flush_dcache_page(page); 442b1e71b06SSteven Whitehouse brelse(dibh); 443b1e71b06SSteven Whitehouse SetPageUptodate(page); 444b1e71b06SSteven Whitehouse 445b1e71b06SSteven Whitehouse return 0; 446b1e71b06SSteven Whitehouse } 447b1e71b06SSteven Whitehouse 448b1e71b06SSteven Whitehouse 449b1e71b06SSteven Whitehouse /** 450b1e71b06SSteven Whitehouse * __gfs2_readpage - readpage 451b1e71b06SSteven Whitehouse * @file: The file to read a page for 452b1e71b06SSteven Whitehouse * @page: The page to read 453b1e71b06SSteven Whitehouse * 454b1e71b06SSteven Whitehouse * This is the core of gfs2's readpage. Its used by the internal file 455b1e71b06SSteven Whitehouse * reading code as in that case we already hold the glock. Also its 456b1e71b06SSteven Whitehouse * called by gfs2_readpage() once the required lock has been granted. 457b1e71b06SSteven Whitehouse * 458b1e71b06SSteven Whitehouse */ 459b1e71b06SSteven Whitehouse 460b1e71b06SSteven Whitehouse static int __gfs2_readpage(void *file, struct page *page) 461b1e71b06SSteven Whitehouse { 462b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(page->mapping->host); 463b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 464b1e71b06SSteven Whitehouse int error; 465b1e71b06SSteven Whitehouse 466b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 467b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 468b1e71b06SSteven Whitehouse unlock_page(page); 469b1e71b06SSteven Whitehouse } else { 470b1e71b06SSteven Whitehouse error = mpage_readpage(page, gfs2_block_map); 471b1e71b06SSteven Whitehouse } 472b1e71b06SSteven Whitehouse 473b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 474b1e71b06SSteven Whitehouse return -EIO; 475b1e71b06SSteven Whitehouse 476b1e71b06SSteven Whitehouse return error; 477b1e71b06SSteven Whitehouse } 478b1e71b06SSteven Whitehouse 479b1e71b06SSteven Whitehouse /** 480b1e71b06SSteven Whitehouse * gfs2_readpage - read a page of a file 481b1e71b06SSteven Whitehouse * @file: The file to read 482b1e71b06SSteven Whitehouse * @page: The page of the file 483b1e71b06SSteven Whitehouse * 484b1e71b06SSteven Whitehouse * This deals with the locking required. We have to unlock and 485b1e71b06SSteven Whitehouse * relock the page in order to get the locking in the right 486b1e71b06SSteven Whitehouse * order. 487b1e71b06SSteven Whitehouse */ 488b1e71b06SSteven Whitehouse 489b1e71b06SSteven Whitehouse static int gfs2_readpage(struct file *file, struct page *page) 490b1e71b06SSteven Whitehouse { 491b1e71b06SSteven Whitehouse struct address_space *mapping = page->mapping; 492b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 493b1e71b06SSteven Whitehouse struct gfs2_holder gh; 494b1e71b06SSteven Whitehouse int error; 495b1e71b06SSteven Whitehouse 496b1e71b06SSteven Whitehouse unlock_page(page); 497b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 498b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&gh); 499b1e71b06SSteven Whitehouse if (unlikely(error)) 500b1e71b06SSteven Whitehouse goto out; 501b1e71b06SSteven Whitehouse error = AOP_TRUNCATED_PAGE; 502b1e71b06SSteven Whitehouse lock_page(page); 503b1e71b06SSteven Whitehouse if (page->mapping == mapping && !PageUptodate(page)) 504b1e71b06SSteven Whitehouse error = __gfs2_readpage(file, page); 505b1e71b06SSteven Whitehouse else 506b1e71b06SSteven Whitehouse unlock_page(page); 507b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 508b1e71b06SSteven Whitehouse out: 509b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 510b1e71b06SSteven Whitehouse if (error && error != AOP_TRUNCATED_PAGE) 511b1e71b06SSteven Whitehouse lock_page(page); 512b1e71b06SSteven Whitehouse return error; 513b1e71b06SSteven Whitehouse } 514b1e71b06SSteven Whitehouse 515b1e71b06SSteven Whitehouse /** 516b1e71b06SSteven Whitehouse * gfs2_internal_read - read an internal file 517b1e71b06SSteven Whitehouse * @ip: The gfs2 inode 518b1e71b06SSteven Whitehouse * @buf: The buffer to fill 519b1e71b06SSteven Whitehouse * @pos: The file position 520b1e71b06SSteven Whitehouse * @size: The amount to read 521b1e71b06SSteven Whitehouse * 522b1e71b06SSteven Whitehouse */ 523b1e71b06SSteven Whitehouse 5244306629eSAndrew Price int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, 5254306629eSAndrew Price unsigned size) 526b1e71b06SSteven Whitehouse { 527b1e71b06SSteven Whitehouse struct address_space *mapping = ip->i_inode.i_mapping; 528b1e71b06SSteven Whitehouse unsigned long index = *pos / PAGE_CACHE_SIZE; 529b1e71b06SSteven Whitehouse unsigned offset = *pos & (PAGE_CACHE_SIZE - 1); 530b1e71b06SSteven Whitehouse unsigned copied = 0; 531b1e71b06SSteven Whitehouse unsigned amt; 532b1e71b06SSteven Whitehouse struct page *page; 533b1e71b06SSteven Whitehouse void *p; 534b1e71b06SSteven Whitehouse 535b1e71b06SSteven Whitehouse do { 536b1e71b06SSteven Whitehouse amt = size - copied; 537b1e71b06SSteven Whitehouse if (offset + size > PAGE_CACHE_SIZE) 538b1e71b06SSteven Whitehouse amt = PAGE_CACHE_SIZE - offset; 539b1e71b06SSteven Whitehouse page = read_cache_page(mapping, index, __gfs2_readpage, NULL); 540b1e71b06SSteven Whitehouse if (IS_ERR(page)) 541b1e71b06SSteven Whitehouse return PTR_ERR(page); 542d9349285SCong Wang p = kmap_atomic(page); 543b1e71b06SSteven Whitehouse memcpy(buf + copied, p + offset, amt); 544d9349285SCong Wang kunmap_atomic(p); 545b1e71b06SSteven Whitehouse mark_page_accessed(page); 546b1e71b06SSteven Whitehouse page_cache_release(page); 547b1e71b06SSteven Whitehouse copied += amt; 548b1e71b06SSteven Whitehouse index++; 549b1e71b06SSteven Whitehouse offset = 0; 550b1e71b06SSteven Whitehouse } while(copied < size); 551b1e71b06SSteven Whitehouse (*pos) += size; 552b1e71b06SSteven Whitehouse return size; 553b1e71b06SSteven Whitehouse } 554b1e71b06SSteven Whitehouse 555b1e71b06SSteven Whitehouse /** 556b1e71b06SSteven Whitehouse * gfs2_readpages - Read a bunch of pages at once 557b1e71b06SSteven Whitehouse * 558b1e71b06SSteven Whitehouse * Some notes: 559b1e71b06SSteven Whitehouse * 1. This is only for readahead, so we can simply ignore any things 560b1e71b06SSteven Whitehouse * which are slightly inconvenient (such as locking conflicts between 561b1e71b06SSteven Whitehouse * the page lock and the glock) and return having done no I/O. Its 562b1e71b06SSteven Whitehouse * obviously not something we'd want to do on too regular a basis. 563b1e71b06SSteven Whitehouse * Any I/O we ignore at this time will be done via readpage later. 564b1e71b06SSteven Whitehouse * 2. We don't handle stuffed files here we let readpage do the honours. 565b1e71b06SSteven Whitehouse * 3. mpage_readpages() does most of the heavy lifting in the common case. 566b1e71b06SSteven Whitehouse * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. 567b1e71b06SSteven Whitehouse */ 568b1e71b06SSteven Whitehouse 569b1e71b06SSteven Whitehouse static int gfs2_readpages(struct file *file, struct address_space *mapping, 570b1e71b06SSteven Whitehouse struct list_head *pages, unsigned nr_pages) 571b1e71b06SSteven Whitehouse { 572b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 573b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 574b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 575b1e71b06SSteven Whitehouse struct gfs2_holder gh; 576b1e71b06SSteven Whitehouse int ret; 577b1e71b06SSteven Whitehouse 578b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 579b1e71b06SSteven Whitehouse ret = gfs2_glock_nq(&gh); 580b1e71b06SSteven Whitehouse if (unlikely(ret)) 581b1e71b06SSteven Whitehouse goto out_uninit; 582b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 583b1e71b06SSteven Whitehouse ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); 584b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 585b1e71b06SSteven Whitehouse out_uninit: 586b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 587b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 588b1e71b06SSteven Whitehouse ret = -EIO; 589b1e71b06SSteven Whitehouse return ret; 590b1e71b06SSteven Whitehouse } 591b1e71b06SSteven Whitehouse 592b1e71b06SSteven Whitehouse /** 593b1e71b06SSteven Whitehouse * gfs2_write_begin - Begin to write to a file 594b1e71b06SSteven Whitehouse * @file: The file to write to 595b1e71b06SSteven Whitehouse * @mapping: The mapping in which to write 596b1e71b06SSteven Whitehouse * @pos: The file offset at which to start writing 597b1e71b06SSteven Whitehouse * @len: Length of the write 598b1e71b06SSteven Whitehouse * @flags: Various flags 599b1e71b06SSteven Whitehouse * @pagep: Pointer to return the page 600b1e71b06SSteven Whitehouse * @fsdata: Pointer to return fs data (unused by GFS2) 601b1e71b06SSteven Whitehouse * 602b1e71b06SSteven Whitehouse * Returns: errno 603b1e71b06SSteven Whitehouse */ 604b1e71b06SSteven Whitehouse 605b1e71b06SSteven Whitehouse static int gfs2_write_begin(struct file *file, struct address_space *mapping, 606b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned flags, 607b1e71b06SSteven Whitehouse struct page **pagep, void **fsdata) 608b1e71b06SSteven Whitehouse { 609b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 610b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 6111946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 612b1e71b06SSteven Whitehouse unsigned int data_blocks = 0, ind_blocks = 0, rblocks; 61371f890f7SSteven Whitehouse unsigned requested = 0; 614b1e71b06SSteven Whitehouse int alloc_required; 615b1e71b06SSteven Whitehouse int error = 0; 616b1e71b06SSteven Whitehouse pgoff_t index = pos >> PAGE_CACHE_SHIFT; 617b1e71b06SSteven Whitehouse unsigned from = pos & (PAGE_CACHE_SIZE - 1); 618b1e71b06SSteven Whitehouse struct page *page; 619b1e71b06SSteven Whitehouse 620b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); 621b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&ip->i_gh); 622b1e71b06SSteven Whitehouse if (unlikely(error)) 623b1e71b06SSteven Whitehouse goto out_uninit; 6241946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 6251946f70aSBenjamin Marzinski error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 6261946f70aSBenjamin Marzinski GL_NOCACHE, &m_ip->i_gh); 6271946f70aSBenjamin Marzinski if (unlikely(error)) { 6281946f70aSBenjamin Marzinski gfs2_glock_dq(&ip->i_gh); 6291946f70aSBenjamin Marzinski goto out_uninit; 6301946f70aSBenjamin Marzinski } 6311946f70aSBenjamin Marzinski } 632b1e71b06SSteven Whitehouse 633461cb419SBob Peterson alloc_required = gfs2_write_alloc_required(ip, pos, len); 634b1e71b06SSteven Whitehouse 635b1e71b06SSteven Whitehouse if (alloc_required || gfs2_is_jdata(ip)) 636b1e71b06SSteven Whitehouse gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); 637b1e71b06SSteven Whitehouse 638b1e71b06SSteven Whitehouse if (alloc_required) { 639b1e71b06SSteven Whitehouse error = gfs2_quota_lock_check(ip); 640b1e71b06SSteven Whitehouse if (error) 6415407e242SBob Peterson goto out_unlock; 642b1e71b06SSteven Whitehouse 64371f890f7SSteven Whitehouse requested = data_blocks + ind_blocks; 6449dbe9610SSteven Whitehouse error = gfs2_inplace_reserve(ip, requested, 0); 645b1e71b06SSteven Whitehouse if (error) 646b1e71b06SSteven Whitehouse goto out_qunlock; 647b1e71b06SSteven Whitehouse } 648b1e71b06SSteven Whitehouse 649b1e71b06SSteven Whitehouse rblocks = RES_DINODE + ind_blocks; 650b1e71b06SSteven Whitehouse if (gfs2_is_jdata(ip)) 651b1e71b06SSteven Whitehouse rblocks += data_blocks ? data_blocks : 1; 652b1e71b06SSteven Whitehouse if (ind_blocks || data_blocks) 653b1e71b06SSteven Whitehouse rblocks += RES_STATFS + RES_QUOTA; 6541946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) 6551946f70aSBenjamin Marzinski rblocks += 2 * RES_STATFS; 656bf97b673SBenjamin Marzinski if (alloc_required) 65771f890f7SSteven Whitehouse rblocks += gfs2_rg_blocks(ip, requested); 658b1e71b06SSteven Whitehouse 659b1e71b06SSteven Whitehouse error = gfs2_trans_begin(sdp, rblocks, 660b1e71b06SSteven Whitehouse PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); 661b1e71b06SSteven Whitehouse if (error) 662b1e71b06SSteven Whitehouse goto out_trans_fail; 663b1e71b06SSteven Whitehouse 664b1e71b06SSteven Whitehouse error = -ENOMEM; 665b1e71b06SSteven Whitehouse flags |= AOP_FLAG_NOFS; 666b1e71b06SSteven Whitehouse page = grab_cache_page_write_begin(mapping, index, flags); 667b1e71b06SSteven Whitehouse *pagep = page; 668b1e71b06SSteven Whitehouse if (unlikely(!page)) 669b1e71b06SSteven Whitehouse goto out_endtrans; 670b1e71b06SSteven Whitehouse 671b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 672b1e71b06SSteven Whitehouse error = 0; 673b1e71b06SSteven Whitehouse if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { 674b1e71b06SSteven Whitehouse error = gfs2_unstuff_dinode(ip, page); 675b1e71b06SSteven Whitehouse if (error == 0) 676b1e71b06SSteven Whitehouse goto prepare_write; 677b1e71b06SSteven Whitehouse } else if (!PageUptodate(page)) { 678b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 679b1e71b06SSteven Whitehouse } 680b1e71b06SSteven Whitehouse goto out; 681b1e71b06SSteven Whitehouse } 682b1e71b06SSteven Whitehouse 683b1e71b06SSteven Whitehouse prepare_write: 684ebdec241SChristoph Hellwig error = __block_write_begin(page, from, len, gfs2_block_map); 685b1e71b06SSteven Whitehouse out: 686b1e71b06SSteven Whitehouse if (error == 0) 687b1e71b06SSteven Whitehouse return 0; 688b1e71b06SSteven Whitehouse 6896c474f7bSMaxim unlock_page(page); 690b1e71b06SSteven Whitehouse page_cache_release(page); 69115c6fd97Snpiggin@suse.de 692ff8f33c8SSteven Whitehouse gfs2_trans_end(sdp); 693b1e71b06SSteven Whitehouse if (pos + len > ip->i_inode.i_size) 694ff8f33c8SSteven Whitehouse gfs2_trim_blocks(&ip->i_inode); 695ff8f33c8SSteven Whitehouse goto out_trans_fail; 696ff8f33c8SSteven Whitehouse 697b1e71b06SSteven Whitehouse out_endtrans: 698b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 699b1e71b06SSteven Whitehouse out_trans_fail: 700b1e71b06SSteven Whitehouse if (alloc_required) { 701b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 702b1e71b06SSteven Whitehouse out_qunlock: 703b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 704b1e71b06SSteven Whitehouse } 705b1e71b06SSteven Whitehouse out_unlock: 7061946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 7071946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 7081946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 7091946f70aSBenjamin Marzinski } 710b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 711b1e71b06SSteven Whitehouse out_uninit: 712b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 713b1e71b06SSteven Whitehouse return error; 714b1e71b06SSteven Whitehouse } 715b1e71b06SSteven Whitehouse 716b1e71b06SSteven Whitehouse /** 717b1e71b06SSteven Whitehouse * adjust_fs_space - Adjusts the free space available due to gfs2_grow 718b1e71b06SSteven Whitehouse * @inode: the rindex inode 719b1e71b06SSteven Whitehouse */ 720b1e71b06SSteven Whitehouse static void adjust_fs_space(struct inode *inode) 721b1e71b06SSteven Whitehouse { 722b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; 7231946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 7241946f70aSBenjamin Marzinski struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 725b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 726b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 7271946f70aSBenjamin Marzinski struct buffer_head *m_bh, *l_bh; 728b1e71b06SSteven Whitehouse u64 fs_total, new_free; 729b1e71b06SSteven Whitehouse 730b1e71b06SSteven Whitehouse /* Total up the file system space, according to the latest rindex. */ 731b1e71b06SSteven Whitehouse fs_total = gfs2_ri_total(sdp); 7321946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) 7331946f70aSBenjamin Marzinski return; 734b1e71b06SSteven Whitehouse 735b1e71b06SSteven Whitehouse spin_lock(&sdp->sd_statfs_spin); 7361946f70aSBenjamin Marzinski gfs2_statfs_change_in(m_sc, m_bh->b_data + 7371946f70aSBenjamin Marzinski sizeof(struct gfs2_dinode)); 738b1e71b06SSteven Whitehouse if (fs_total > (m_sc->sc_total + l_sc->sc_total)) 739b1e71b06SSteven Whitehouse new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); 740b1e71b06SSteven Whitehouse else 741b1e71b06SSteven Whitehouse new_free = 0; 742b1e71b06SSteven Whitehouse spin_unlock(&sdp->sd_statfs_spin); 743b1e71b06SSteven Whitehouse fs_warn(sdp, "File system extended by %llu blocks.\n", 744b1e71b06SSteven Whitehouse (unsigned long long)new_free); 745b1e71b06SSteven Whitehouse gfs2_statfs_change(sdp, new_free, new_free, 0); 7461946f70aSBenjamin Marzinski 7471946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) 7481946f70aSBenjamin Marzinski goto out; 7491946f70aSBenjamin Marzinski update_statfs(sdp, m_bh, l_bh); 7501946f70aSBenjamin Marzinski brelse(l_bh); 7511946f70aSBenjamin Marzinski out: 7521946f70aSBenjamin Marzinski brelse(m_bh); 753b1e71b06SSteven Whitehouse } 754b1e71b06SSteven Whitehouse 755b1e71b06SSteven Whitehouse /** 756b1e71b06SSteven Whitehouse * gfs2_stuffed_write_end - Write end for stuffed files 757b1e71b06SSteven Whitehouse * @inode: The inode 758b1e71b06SSteven Whitehouse * @dibh: The buffer_head containing the on-disk inode 759b1e71b06SSteven Whitehouse * @pos: The file position 760b1e71b06SSteven Whitehouse * @len: The length of the write 761b1e71b06SSteven Whitehouse * @copied: How much was actually copied by the VFS 762b1e71b06SSteven Whitehouse * @page: The page 763b1e71b06SSteven Whitehouse * 764b1e71b06SSteven Whitehouse * This copies the data from the page into the inode block after 765b1e71b06SSteven Whitehouse * the inode data structure itself. 766b1e71b06SSteven Whitehouse * 767b1e71b06SSteven Whitehouse * Returns: errno 768b1e71b06SSteven Whitehouse */ 769b1e71b06SSteven Whitehouse static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, 770b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 771b1e71b06SSteven Whitehouse struct page *page) 772b1e71b06SSteven Whitehouse { 773b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 774b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 7751946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 776b1e71b06SSteven Whitehouse u64 to = pos + copied; 777b1e71b06SSteven Whitehouse void *kaddr; 778b1e71b06SSteven Whitehouse unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); 779b1e71b06SSteven Whitehouse 780b1e71b06SSteven Whitehouse BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode))); 781d9349285SCong Wang kaddr = kmap_atomic(page); 782b1e71b06SSteven Whitehouse memcpy(buf + pos, kaddr + pos, copied); 783b1e71b06SSteven Whitehouse memset(kaddr + pos + copied, 0, len - copied); 784b1e71b06SSteven Whitehouse flush_dcache_page(page); 785d9349285SCong Wang kunmap_atomic(kaddr); 786b1e71b06SSteven Whitehouse 787b1e71b06SSteven Whitehouse if (!PageUptodate(page)) 788b1e71b06SSteven Whitehouse SetPageUptodate(page); 789b1e71b06SSteven Whitehouse unlock_page(page); 790b1e71b06SSteven Whitehouse page_cache_release(page); 791b1e71b06SSteven Whitehouse 792b1e71b06SSteven Whitehouse if (copied) { 793a2e0f799SSteven Whitehouse if (inode->i_size < to) 794b1e71b06SSteven Whitehouse i_size_write(inode, to); 795b1e71b06SSteven Whitehouse mark_inode_dirty(inode); 796b1e71b06SSteven Whitehouse } 797b1e71b06SSteven Whitehouse 7989ae3c6deSBenjamin Marzinski if (inode == sdp->sd_rindex) { 799b1e71b06SSteven Whitehouse adjust_fs_space(inode); 800ca9248d8SBob Peterson sdp->sd_rindex_uptodate = 0; 8019ae3c6deSBenjamin Marzinski } 802b1e71b06SSteven Whitehouse 803b1e71b06SSteven Whitehouse brelse(dibh); 804b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 8051946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 8061946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 8071946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 8081946f70aSBenjamin Marzinski } 809b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 810b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 811b1e71b06SSteven Whitehouse return copied; 812b1e71b06SSteven Whitehouse } 813b1e71b06SSteven Whitehouse 814b1e71b06SSteven Whitehouse /** 815b1e71b06SSteven Whitehouse * gfs2_write_end 816b1e71b06SSteven Whitehouse * @file: The file to write to 817b1e71b06SSteven Whitehouse * @mapping: The address space to write to 818b1e71b06SSteven Whitehouse * @pos: The file position 819b1e71b06SSteven Whitehouse * @len: The length of the data 820b1e71b06SSteven Whitehouse * @copied: 821b1e71b06SSteven Whitehouse * @page: The page that has been written 822b1e71b06SSteven Whitehouse * @fsdata: The fsdata (unused in GFS2) 823b1e71b06SSteven Whitehouse * 824b1e71b06SSteven Whitehouse * The main write_end function for GFS2. We have a separate one for 825b1e71b06SSteven Whitehouse * stuffed files as they are slightly different, otherwise we just 826b1e71b06SSteven Whitehouse * put our locking around the VFS provided functions. 827b1e71b06SSteven Whitehouse * 828b1e71b06SSteven Whitehouse * Returns: errno 829b1e71b06SSteven Whitehouse */ 830b1e71b06SSteven Whitehouse 831b1e71b06SSteven Whitehouse static int gfs2_write_end(struct file *file, struct address_space *mapping, 832b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 833b1e71b06SSteven Whitehouse struct page *page, void *fsdata) 834b1e71b06SSteven Whitehouse { 835b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 836b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 837b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 8381946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 839b1e71b06SSteven Whitehouse struct buffer_head *dibh; 840b1e71b06SSteven Whitehouse unsigned int from = pos & (PAGE_CACHE_SIZE - 1); 841b1e71b06SSteven Whitehouse unsigned int to = from + len; 842b1e71b06SSteven Whitehouse int ret; 843b1e71b06SSteven Whitehouse 844b1e71b06SSteven Whitehouse BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); 845b1e71b06SSteven Whitehouse 846b1e71b06SSteven Whitehouse ret = gfs2_meta_inode_buffer(ip, &dibh); 847b1e71b06SSteven Whitehouse if (unlikely(ret)) { 848b1e71b06SSteven Whitehouse unlock_page(page); 849b1e71b06SSteven Whitehouse page_cache_release(page); 850b1e71b06SSteven Whitehouse goto failed; 851b1e71b06SSteven Whitehouse } 852b1e71b06SSteven Whitehouse 853350a9b0aSSteven Whitehouse gfs2_trans_add_meta(ip->i_gl, dibh); 854b1e71b06SSteven Whitehouse 855b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 856b1e71b06SSteven Whitehouse return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); 857b1e71b06SSteven Whitehouse 858b1e71b06SSteven Whitehouse if (!gfs2_is_writeback(ip)) 859b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, from, to); 860b1e71b06SSteven Whitehouse 861b1e71b06SSteven Whitehouse ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); 862b1e71b06SSteven Whitehouse 8639ae3c6deSBenjamin Marzinski if (inode == sdp->sd_rindex) { 864b1e71b06SSteven Whitehouse adjust_fs_space(inode); 865ca9248d8SBob Peterson sdp->sd_rindex_uptodate = 0; 8669ae3c6deSBenjamin Marzinski } 867b1e71b06SSteven Whitehouse 868b1e71b06SSteven Whitehouse brelse(dibh); 869b1e71b06SSteven Whitehouse failed: 870deab72d3SBob Peterson gfs2_trans_end(sdp); 871b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 8725407e242SBob Peterson if (ip->i_res->rs_qa_qd_num) 873b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 8741946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 8751946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 8761946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 8771946f70aSBenjamin Marzinski } 878b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 879b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 880b1e71b06SSteven Whitehouse return ret; 881b1e71b06SSteven Whitehouse } 882b1e71b06SSteven Whitehouse 883b1e71b06SSteven Whitehouse /** 884b1e71b06SSteven Whitehouse * gfs2_set_page_dirty - Page dirtying function 885b1e71b06SSteven Whitehouse * @page: The page to dirty 886b1e71b06SSteven Whitehouse * 887b1e71b06SSteven Whitehouse * Returns: 1 if it dirtyed the page, or 0 otherwise 888b1e71b06SSteven Whitehouse */ 889b1e71b06SSteven Whitehouse 890b1e71b06SSteven Whitehouse static int gfs2_set_page_dirty(struct page *page) 891b1e71b06SSteven Whitehouse { 892b1e71b06SSteven Whitehouse SetPageChecked(page); 893b1e71b06SSteven Whitehouse return __set_page_dirty_buffers(page); 894b1e71b06SSteven Whitehouse } 895b1e71b06SSteven Whitehouse 896b1e71b06SSteven Whitehouse /** 897b1e71b06SSteven Whitehouse * gfs2_bmap - Block map function 898b1e71b06SSteven Whitehouse * @mapping: Address space info 899b1e71b06SSteven Whitehouse * @lblock: The block to map 900b1e71b06SSteven Whitehouse * 901b1e71b06SSteven Whitehouse * Returns: The disk address for the block or 0 on hole or error 902b1e71b06SSteven Whitehouse */ 903b1e71b06SSteven Whitehouse 904b1e71b06SSteven Whitehouse static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) 905b1e71b06SSteven Whitehouse { 906b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 907b1e71b06SSteven Whitehouse struct gfs2_holder i_gh; 908b1e71b06SSteven Whitehouse sector_t dblock = 0; 909b1e71b06SSteven Whitehouse int error; 910b1e71b06SSteven Whitehouse 911b1e71b06SSteven Whitehouse error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 912b1e71b06SSteven Whitehouse if (error) 913b1e71b06SSteven Whitehouse return 0; 914b1e71b06SSteven Whitehouse 915b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 916b1e71b06SSteven Whitehouse dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); 917b1e71b06SSteven Whitehouse 918b1e71b06SSteven Whitehouse gfs2_glock_dq_uninit(&i_gh); 919b1e71b06SSteven Whitehouse 920b1e71b06SSteven Whitehouse return dblock; 921b1e71b06SSteven Whitehouse } 922b1e71b06SSteven Whitehouse 923b1e71b06SSteven Whitehouse static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) 924b1e71b06SSteven Whitehouse { 925b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 926b1e71b06SSteven Whitehouse 927b1e71b06SSteven Whitehouse lock_buffer(bh); 928b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 929b1e71b06SSteven Whitehouse clear_buffer_dirty(bh); 930b1e71b06SSteven Whitehouse bd = bh->b_private; 931b1e71b06SSteven Whitehouse if (bd) { 932c0752aa7SBob Peterson if (!list_empty(&bd->bd_list) && !buffer_pinned(bh)) 933c0752aa7SBob Peterson list_del_init(&bd->bd_list); 934b1e71b06SSteven Whitehouse else 935b1e71b06SSteven Whitehouse gfs2_remove_from_journal(bh, current->journal_info, 0); 936b1e71b06SSteven Whitehouse } 937b1e71b06SSteven Whitehouse bh->b_bdev = NULL; 938b1e71b06SSteven Whitehouse clear_buffer_mapped(bh); 939b1e71b06SSteven Whitehouse clear_buffer_req(bh); 940b1e71b06SSteven Whitehouse clear_buffer_new(bh); 941b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 942b1e71b06SSteven Whitehouse unlock_buffer(bh); 943b1e71b06SSteven Whitehouse } 944b1e71b06SSteven Whitehouse 945b1e71b06SSteven Whitehouse static void gfs2_invalidatepage(struct page *page, unsigned long offset) 946b1e71b06SSteven Whitehouse { 947b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 948b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 949b1e71b06SSteven Whitehouse unsigned long pos = 0; 950b1e71b06SSteven Whitehouse 951b1e71b06SSteven Whitehouse BUG_ON(!PageLocked(page)); 952b1e71b06SSteven Whitehouse if (offset == 0) 953b1e71b06SSteven Whitehouse ClearPageChecked(page); 954b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 955b1e71b06SSteven Whitehouse goto out; 956b1e71b06SSteven Whitehouse 957b1e71b06SSteven Whitehouse bh = head = page_buffers(page); 958b1e71b06SSteven Whitehouse do { 959b1e71b06SSteven Whitehouse if (offset <= pos) 960b1e71b06SSteven Whitehouse gfs2_discard(sdp, bh); 961b1e71b06SSteven Whitehouse pos += bh->b_size; 962b1e71b06SSteven Whitehouse bh = bh->b_this_page; 963b1e71b06SSteven Whitehouse } while (bh != head); 964b1e71b06SSteven Whitehouse out: 965b1e71b06SSteven Whitehouse if (offset == 0) 966b1e71b06SSteven Whitehouse try_to_release_page(page, 0); 967b1e71b06SSteven Whitehouse } 968b1e71b06SSteven Whitehouse 969b1e71b06SSteven Whitehouse /** 970b1e71b06SSteven Whitehouse * gfs2_ok_for_dio - check that dio is valid on this file 971b1e71b06SSteven Whitehouse * @ip: The inode 972b1e71b06SSteven Whitehouse * @rw: READ or WRITE 973b1e71b06SSteven Whitehouse * @offset: The offset at which we are reading or writing 974b1e71b06SSteven Whitehouse * 975b1e71b06SSteven Whitehouse * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) 976b1e71b06SSteven Whitehouse * 1 (to accept the i/o request) 977b1e71b06SSteven Whitehouse */ 978b1e71b06SSteven Whitehouse static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset) 979b1e71b06SSteven Whitehouse { 980b1e71b06SSteven Whitehouse /* 981b1e71b06SSteven Whitehouse * Should we return an error here? I can't see that O_DIRECT for 982b1e71b06SSteven Whitehouse * a stuffed file makes any sense. For now we'll silently fall 983b1e71b06SSteven Whitehouse * back to buffered I/O 984b1e71b06SSteven Whitehouse */ 985b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 986b1e71b06SSteven Whitehouse return 0; 987b1e71b06SSteven Whitehouse 988b1e71b06SSteven Whitehouse if (offset >= i_size_read(&ip->i_inode)) 989b1e71b06SSteven Whitehouse return 0; 990b1e71b06SSteven Whitehouse return 1; 991b1e71b06SSteven Whitehouse } 992b1e71b06SSteven Whitehouse 993b1e71b06SSteven Whitehouse 994b1e71b06SSteven Whitehouse 995b1e71b06SSteven Whitehouse static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, 996b1e71b06SSteven Whitehouse const struct iovec *iov, loff_t offset, 997b1e71b06SSteven Whitehouse unsigned long nr_segs) 998b1e71b06SSteven Whitehouse { 999b1e71b06SSteven Whitehouse struct file *file = iocb->ki_filp; 1000b1e71b06SSteven Whitehouse struct inode *inode = file->f_mapping->host; 1001b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1002b1e71b06SSteven Whitehouse struct gfs2_holder gh; 1003b1e71b06SSteven Whitehouse int rv; 1004b1e71b06SSteven Whitehouse 1005b1e71b06SSteven Whitehouse /* 1006b1e71b06SSteven Whitehouse * Deferred lock, even if its a write, since we do no allocation 1007b1e71b06SSteven Whitehouse * on this path. All we need change is atime, and this lock mode 1008b1e71b06SSteven Whitehouse * ensures that other nodes have flushed their buffered read caches 1009b1e71b06SSteven Whitehouse * (i.e. their page cache entries for this inode). We do not, 1010b1e71b06SSteven Whitehouse * unfortunately have the option of only flushing a range like 1011b1e71b06SSteven Whitehouse * the VFS does. 1012b1e71b06SSteven Whitehouse */ 1013b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); 1014b1e71b06SSteven Whitehouse rv = gfs2_glock_nq(&gh); 1015b1e71b06SSteven Whitehouse if (rv) 1016b1e71b06SSteven Whitehouse return rv; 1017b1e71b06SSteven Whitehouse rv = gfs2_ok_for_dio(ip, rw, offset); 1018b1e71b06SSteven Whitehouse if (rv != 1) 1019b1e71b06SSteven Whitehouse goto out; /* dio not valid, fall back to buffered i/o */ 1020b1e71b06SSteven Whitehouse 1021eafdc7d1SChristoph Hellwig rv = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 1022eafdc7d1SChristoph Hellwig offset, nr_segs, gfs2_get_block_direct, 1023eafdc7d1SChristoph Hellwig NULL, NULL, 0); 1024b1e71b06SSteven Whitehouse out: 10258e711e10SBob Peterson gfs2_glock_dq(&gh); 1026b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 1027b1e71b06SSteven Whitehouse return rv; 1028b1e71b06SSteven Whitehouse } 1029b1e71b06SSteven Whitehouse 1030b1e71b06SSteven Whitehouse /** 1031b1e71b06SSteven Whitehouse * gfs2_releasepage - free the metadata associated with a page 1032b1e71b06SSteven Whitehouse * @page: the page that's being released 1033b1e71b06SSteven Whitehouse * @gfp_mask: passed from Linux VFS, ignored by us 1034b1e71b06SSteven Whitehouse * 1035b1e71b06SSteven Whitehouse * Call try_to_free_buffers() if the buffers in this page can be 1036b1e71b06SSteven Whitehouse * released. 1037b1e71b06SSteven Whitehouse * 1038b1e71b06SSteven Whitehouse * Returns: 0 1039b1e71b06SSteven Whitehouse */ 1040b1e71b06SSteven Whitehouse 1041b1e71b06SSteven Whitehouse int gfs2_releasepage(struct page *page, gfp_t gfp_mask) 1042b1e71b06SSteven Whitehouse { 1043009d8518SSteven Whitehouse struct address_space *mapping = page->mapping; 1044009d8518SSteven Whitehouse struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 1045b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 1046b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 1047b1e71b06SSteven Whitehouse 1048b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 1049b1e71b06SSteven Whitehouse return 0; 1050b1e71b06SSteven Whitehouse 1051b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 1052380f7c65SSteven Whitehouse spin_lock(&sdp->sd_ail_lock); 1053b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1054b1e71b06SSteven Whitehouse do { 1055b1e71b06SSteven Whitehouse if (atomic_read(&bh->b_count)) 1056b1e71b06SSteven Whitehouse goto cannot_release; 1057b1e71b06SSteven Whitehouse bd = bh->b_private; 105816ca9412SBenjamin Marzinski if (bd && bd->bd_tr) 1059b1e71b06SSteven Whitehouse goto cannot_release; 10608f065d36SSteven Whitehouse if (buffer_pinned(bh) || buffer_dirty(bh)) 10618f065d36SSteven Whitehouse goto not_possible; 1062b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1063b1e71b06SSteven Whitehouse } while(bh != head); 1064380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 1065b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1066b1e71b06SSteven Whitehouse 1067b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1068b1e71b06SSteven Whitehouse do { 1069b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 1070b1e71b06SSteven Whitehouse bd = bh->b_private; 1071b1e71b06SSteven Whitehouse if (bd) { 1072b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, bd->bd_bh == bh); 1073c0752aa7SBob Peterson if (!list_empty(&bd->bd_list)) { 1074b1e71b06SSteven Whitehouse if (!buffer_pinned(bh)) 1075c0752aa7SBob Peterson list_del_init(&bd->bd_list); 1076b1e71b06SSteven Whitehouse else 1077b1e71b06SSteven Whitehouse bd = NULL; 1078b1e71b06SSteven Whitehouse } 1079b1e71b06SSteven Whitehouse if (bd) 1080b1e71b06SSteven Whitehouse bd->bd_bh = NULL; 1081b1e71b06SSteven Whitehouse bh->b_private = NULL; 1082b1e71b06SSteven Whitehouse } 1083b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1084b1e71b06SSteven Whitehouse if (bd) 1085b1e71b06SSteven Whitehouse kmem_cache_free(gfs2_bufdata_cachep, bd); 1086b1e71b06SSteven Whitehouse 1087b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1088b1e71b06SSteven Whitehouse } while (bh != head); 1089b1e71b06SSteven Whitehouse 1090b1e71b06SSteven Whitehouse return try_to_free_buffers(page); 10918f065d36SSteven Whitehouse 10928f065d36SSteven Whitehouse not_possible: /* Should never happen */ 10938f065d36SSteven Whitehouse WARN_ON(buffer_dirty(bh)); 10948f065d36SSteven Whitehouse WARN_ON(buffer_pinned(bh)); 1095b1e71b06SSteven Whitehouse cannot_release: 1096380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 1097b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1098b1e71b06SSteven Whitehouse return 0; 1099b1e71b06SSteven Whitehouse } 1100b1e71b06SSteven Whitehouse 1101b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_writeback_aops = { 1102b1e71b06SSteven Whitehouse .writepage = gfs2_writeback_writepage, 110345138990SSteven Whitehouse .writepages = gfs2_writepages, 1104b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1105b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1106b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1107b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1108b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1109b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1110b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1111b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1112b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1113b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1114aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1115b1e71b06SSteven Whitehouse }; 1116b1e71b06SSteven Whitehouse 1117b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_ordered_aops = { 1118b1e71b06SSteven Whitehouse .writepage = gfs2_ordered_writepage, 111945138990SSteven Whitehouse .writepages = gfs2_writepages, 1120b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1121b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1122b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1123b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1124b1e71b06SSteven Whitehouse .set_page_dirty = gfs2_set_page_dirty, 1125b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1126b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1127b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1128b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1129b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1130b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1131aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1132b1e71b06SSteven Whitehouse }; 1133b1e71b06SSteven Whitehouse 1134b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_jdata_aops = { 1135b1e71b06SSteven Whitehouse .writepage = gfs2_jdata_writepage, 1136b1e71b06SSteven Whitehouse .writepages = gfs2_jdata_writepages, 1137b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1138b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1139b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1140b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1141b1e71b06SSteven Whitehouse .set_page_dirty = gfs2_set_page_dirty, 1142b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1143b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1144b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1145b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1146aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1147b1e71b06SSteven Whitehouse }; 1148b1e71b06SSteven Whitehouse 1149b1e71b06SSteven Whitehouse void gfs2_set_aops(struct inode *inode) 1150b1e71b06SSteven Whitehouse { 1151b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1152b1e71b06SSteven Whitehouse 1153b1e71b06SSteven Whitehouse if (gfs2_is_writeback(ip)) 1154b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_writeback_aops; 1155b1e71b06SSteven Whitehouse else if (gfs2_is_ordered(ip)) 1156b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_ordered_aops; 1157b1e71b06SSteven Whitehouse else if (gfs2_is_jdata(ip)) 1158b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_jdata_aops; 1159b1e71b06SSteven Whitehouse else 1160b1e71b06SSteven Whitehouse BUG(); 1161b1e71b06SSteven Whitehouse } 1162b1e71b06SSteven Whitehouse 1163