1b1e71b06SSteven Whitehouse /* 2b1e71b06SSteven Whitehouse * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3b1e71b06SSteven Whitehouse * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. 4b1e71b06SSteven Whitehouse * 5b1e71b06SSteven Whitehouse * This copyrighted material is made available to anyone wishing to use, 6b1e71b06SSteven Whitehouse * modify, copy, or redistribute it subject to the terms and conditions 7b1e71b06SSteven Whitehouse * of the GNU General Public License version 2. 8b1e71b06SSteven Whitehouse */ 9b1e71b06SSteven Whitehouse 10b1e71b06SSteven Whitehouse #include <linux/sched.h> 11b1e71b06SSteven Whitehouse #include <linux/slab.h> 12b1e71b06SSteven Whitehouse #include <linux/spinlock.h> 13b1e71b06SSteven Whitehouse #include <linux/completion.h> 14b1e71b06SSteven Whitehouse #include <linux/buffer_head.h> 15b1e71b06SSteven Whitehouse #include <linux/pagemap.h> 16b1e71b06SSteven Whitehouse #include <linux/pagevec.h> 17b1e71b06SSteven Whitehouse #include <linux/mpage.h> 18b1e71b06SSteven Whitehouse #include <linux/fs.h> 19b1e71b06SSteven Whitehouse #include <linux/writeback.h> 20b1e71b06SSteven Whitehouse #include <linux/swap.h> 21b1e71b06SSteven Whitehouse #include <linux/gfs2_ondisk.h> 22b1e71b06SSteven Whitehouse #include <linux/backing-dev.h> 23a27bb332SKent Overstreet #include <linux/aio.h> 24b1e71b06SSteven Whitehouse 25b1e71b06SSteven Whitehouse #include "gfs2.h" 26b1e71b06SSteven Whitehouse #include "incore.h" 27b1e71b06SSteven Whitehouse #include "bmap.h" 28b1e71b06SSteven Whitehouse #include "glock.h" 29b1e71b06SSteven Whitehouse #include "inode.h" 30b1e71b06SSteven Whitehouse #include "log.h" 31b1e71b06SSteven Whitehouse #include "meta_io.h" 32b1e71b06SSteven Whitehouse #include "quota.h" 33b1e71b06SSteven Whitehouse #include "trans.h" 34b1e71b06SSteven Whitehouse #include "rgrp.h" 35b1e71b06SSteven Whitehouse #include "super.h" 36b1e71b06SSteven Whitehouse #include "util.h" 37b1e71b06SSteven Whitehouse #include "glops.h" 38b1e71b06SSteven Whitehouse 39b1e71b06SSteven Whitehouse 40b120193eSBob Peterson static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, 41b1e71b06SSteven Whitehouse unsigned int from, unsigned int to) 42b1e71b06SSteven Whitehouse { 43b1e71b06SSteven Whitehouse struct buffer_head *head = page_buffers(page); 44b1e71b06SSteven Whitehouse unsigned int bsize = head->b_size; 45b1e71b06SSteven Whitehouse struct buffer_head *bh; 46b1e71b06SSteven Whitehouse unsigned int start, end; 47b1e71b06SSteven Whitehouse 48b1e71b06SSteven Whitehouse for (bh = head, start = 0; bh != head || !start; 49b1e71b06SSteven Whitehouse bh = bh->b_this_page, start = end) { 50b1e71b06SSteven Whitehouse end = start + bsize; 51b1e71b06SSteven Whitehouse if (end <= from || start >= to) 52b1e71b06SSteven Whitehouse continue; 53b1e71b06SSteven Whitehouse if (gfs2_is_jdata(ip)) 54b1e71b06SSteven Whitehouse set_buffer_uptodate(bh); 55350a9b0aSSteven Whitehouse gfs2_trans_add_data(ip->i_gl, bh); 56b1e71b06SSteven Whitehouse } 57b1e71b06SSteven Whitehouse } 58b1e71b06SSteven Whitehouse 59b1e71b06SSteven Whitehouse /** 60b1e71b06SSteven Whitehouse * gfs2_get_block_noalloc - Fills in a buffer head with details about a block 61b1e71b06SSteven Whitehouse * @inode: The inode 62b1e71b06SSteven Whitehouse * @lblock: The block number to look up 63b1e71b06SSteven Whitehouse * @bh_result: The buffer head to return the result in 64b1e71b06SSteven Whitehouse * @create: Non-zero if we may add block to the file 65b1e71b06SSteven Whitehouse * 66b1e71b06SSteven Whitehouse * Returns: errno 67b1e71b06SSteven Whitehouse */ 68b1e71b06SSteven Whitehouse 69b1e71b06SSteven Whitehouse static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, 70b1e71b06SSteven Whitehouse struct buffer_head *bh_result, int create) 71b1e71b06SSteven Whitehouse { 72b1e71b06SSteven Whitehouse int error; 73b1e71b06SSteven Whitehouse 74b1e71b06SSteven Whitehouse error = gfs2_block_map(inode, lblock, bh_result, 0); 75b1e71b06SSteven Whitehouse if (error) 76b1e71b06SSteven Whitehouse return error; 77b1e71b06SSteven Whitehouse if (!buffer_mapped(bh_result)) 78b1e71b06SSteven Whitehouse return -EIO; 79b1e71b06SSteven Whitehouse return 0; 80b1e71b06SSteven Whitehouse } 81b1e71b06SSteven Whitehouse 82b1e71b06SSteven Whitehouse static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, 83b1e71b06SSteven Whitehouse struct buffer_head *bh_result, int create) 84b1e71b06SSteven Whitehouse { 85b1e71b06SSteven Whitehouse return gfs2_block_map(inode, lblock, bh_result, 0); 86b1e71b06SSteven Whitehouse } 87b1e71b06SSteven Whitehouse 88b1e71b06SSteven Whitehouse /** 89b1e71b06SSteven Whitehouse * gfs2_writepage_common - Common bits of writepage 90b1e71b06SSteven Whitehouse * @page: The page to be written 91b1e71b06SSteven Whitehouse * @wbc: The writeback control 92b1e71b06SSteven Whitehouse * 93b1e71b06SSteven Whitehouse * Returns: 1 if writepage is ok, otherwise an error code or zero if no error. 94b1e71b06SSteven Whitehouse */ 95b1e71b06SSteven Whitehouse 96b1e71b06SSteven Whitehouse static int gfs2_writepage_common(struct page *page, 97b1e71b06SSteven Whitehouse struct writeback_control *wbc) 98b1e71b06SSteven Whitehouse { 99b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 100b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 101b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 102b1e71b06SSteven Whitehouse loff_t i_size = i_size_read(inode); 103b1e71b06SSteven Whitehouse pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; 104b1e71b06SSteven Whitehouse unsigned offset; 105b1e71b06SSteven Whitehouse 106b1e71b06SSteven Whitehouse if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) 107b1e71b06SSteven Whitehouse goto out; 108b1e71b06SSteven Whitehouse if (current->journal_info) 109b1e71b06SSteven Whitehouse goto redirty; 110b1e71b06SSteven Whitehouse /* Is the page fully outside i_size? (truncate in progress) */ 111b1e71b06SSteven Whitehouse offset = i_size & (PAGE_CACHE_SIZE-1); 112b1e71b06SSteven Whitehouse if (page->index > end_index || (page->index == end_index && !offset)) { 113d47992f8SLukas Czerner page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE); 114b1e71b06SSteven Whitehouse goto out; 115b1e71b06SSteven Whitehouse } 116b1e71b06SSteven Whitehouse return 1; 117b1e71b06SSteven Whitehouse redirty: 118b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 119b1e71b06SSteven Whitehouse out: 120b1e71b06SSteven Whitehouse unlock_page(page); 121b1e71b06SSteven Whitehouse return 0; 122b1e71b06SSteven Whitehouse } 123b1e71b06SSteven Whitehouse 124b1e71b06SSteven Whitehouse /** 1259d358143SSteven Whitehouse * gfs2_writepage - Write page for writeback mappings 126b1e71b06SSteven Whitehouse * @page: The page 127b1e71b06SSteven Whitehouse * @wbc: The writeback control 128b1e71b06SSteven Whitehouse * 129b1e71b06SSteven Whitehouse */ 130b1e71b06SSteven Whitehouse 1319d358143SSteven Whitehouse static int gfs2_writepage(struct page *page, 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_jdata_writepage - The core of jdata writepage 144b1e71b06SSteven Whitehouse * @page: The page to write 145b1e71b06SSteven Whitehouse * @wbc: The writeback control 146b1e71b06SSteven Whitehouse * 147b1e71b06SSteven Whitehouse * This is shared between writepage and writepages and implements the 148b1e71b06SSteven Whitehouse * core of the writepage operation. If a transaction is required then 149b1e71b06SSteven Whitehouse * PageChecked will have been set and the transaction will have 150b1e71b06SSteven Whitehouse * already been started before this is called. 151b1e71b06SSteven Whitehouse */ 152b1e71b06SSteven Whitehouse 153b1e71b06SSteven Whitehouse static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 154b1e71b06SSteven Whitehouse { 155b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 156b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 157b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 158b1e71b06SSteven Whitehouse 159b1e71b06SSteven Whitehouse if (PageChecked(page)) { 160b1e71b06SSteven Whitehouse ClearPageChecked(page); 161b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) { 162b1e71b06SSteven Whitehouse create_empty_buffers(page, inode->i_sb->s_blocksize, 163b1e71b06SSteven Whitehouse (1 << BH_Dirty)|(1 << BH_Uptodate)); 164b1e71b06SSteven Whitehouse } 165b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); 166b1e71b06SSteven Whitehouse } 167b1e71b06SSteven Whitehouse return block_write_full_page(page, gfs2_get_block_noalloc, wbc); 168b1e71b06SSteven Whitehouse } 169b1e71b06SSteven Whitehouse 170b1e71b06SSteven Whitehouse /** 171b1e71b06SSteven Whitehouse * gfs2_jdata_writepage - Write complete page 172b1e71b06SSteven Whitehouse * @page: Page to write 173b1e71b06SSteven Whitehouse * 174b1e71b06SSteven Whitehouse * Returns: errno 175b1e71b06SSteven Whitehouse * 176b1e71b06SSteven Whitehouse */ 177b1e71b06SSteven Whitehouse 178b1e71b06SSteven Whitehouse static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 179b1e71b06SSteven Whitehouse { 180b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 181b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 182b1e71b06SSteven Whitehouse int ret; 183b1e71b06SSteven Whitehouse int done_trans = 0; 184b1e71b06SSteven Whitehouse 185b1e71b06SSteven Whitehouse if (PageChecked(page)) { 186b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_ALL) 187b1e71b06SSteven Whitehouse goto out_ignore; 188b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); 189b1e71b06SSteven Whitehouse if (ret) 190b1e71b06SSteven Whitehouse goto out_ignore; 191b1e71b06SSteven Whitehouse done_trans = 1; 192b1e71b06SSteven Whitehouse } 193b1e71b06SSteven Whitehouse ret = gfs2_writepage_common(page, wbc); 194b1e71b06SSteven Whitehouse if (ret > 0) 195b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 196b1e71b06SSteven Whitehouse if (done_trans) 197b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 198b1e71b06SSteven Whitehouse return ret; 199b1e71b06SSteven Whitehouse 200b1e71b06SSteven Whitehouse out_ignore: 201b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 202b1e71b06SSteven Whitehouse unlock_page(page); 203b1e71b06SSteven Whitehouse return 0; 204b1e71b06SSteven Whitehouse } 205b1e71b06SSteven Whitehouse 206b1e71b06SSteven Whitehouse /** 20745138990SSteven Whitehouse * gfs2_writepages - Write a bunch of dirty pages back to disk 208b1e71b06SSteven Whitehouse * @mapping: The mapping to write 209b1e71b06SSteven Whitehouse * @wbc: Write-back control 210b1e71b06SSteven Whitehouse * 21145138990SSteven Whitehouse * Used for both ordered and writeback modes. 212b1e71b06SSteven Whitehouse */ 21345138990SSteven Whitehouse static int gfs2_writepages(struct address_space *mapping, 214b1e71b06SSteven Whitehouse struct writeback_control *wbc) 215b1e71b06SSteven Whitehouse { 216b1e71b06SSteven Whitehouse return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); 217b1e71b06SSteven Whitehouse } 218b1e71b06SSteven Whitehouse 219b1e71b06SSteven Whitehouse /** 220b1e71b06SSteven Whitehouse * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages 221b1e71b06SSteven Whitehouse * @mapping: The mapping 222b1e71b06SSteven Whitehouse * @wbc: The writeback control 223b1e71b06SSteven Whitehouse * @writepage: The writepage function to call for each page 224b1e71b06SSteven Whitehouse * @pvec: The vector of pages 225b1e71b06SSteven Whitehouse * @nr_pages: The number of pages to write 226b1e71b06SSteven Whitehouse * 227b1e71b06SSteven Whitehouse * Returns: non-zero if loop should terminate, zero otherwise 228b1e71b06SSteven Whitehouse */ 229b1e71b06SSteven Whitehouse 230b1e71b06SSteven Whitehouse static int gfs2_write_jdata_pagevec(struct address_space *mapping, 231b1e71b06SSteven Whitehouse struct writeback_control *wbc, 232b1e71b06SSteven Whitehouse struct pagevec *pvec, 233b1e71b06SSteven Whitehouse int nr_pages, pgoff_t end) 234b1e71b06SSteven Whitehouse { 235b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 236b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 237b1e71b06SSteven Whitehouse loff_t i_size = i_size_read(inode); 238b1e71b06SSteven Whitehouse pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; 239b1e71b06SSteven Whitehouse unsigned offset = i_size & (PAGE_CACHE_SIZE-1); 240b1e71b06SSteven Whitehouse unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize); 241b1e71b06SSteven Whitehouse int i; 242b1e71b06SSteven Whitehouse int ret; 243b1e71b06SSteven Whitehouse 244b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); 245b1e71b06SSteven Whitehouse if (ret < 0) 246b1e71b06SSteven Whitehouse return ret; 247b1e71b06SSteven Whitehouse 248b1e71b06SSteven Whitehouse for(i = 0; i < nr_pages; i++) { 249b1e71b06SSteven Whitehouse struct page *page = pvec->pages[i]; 250b1e71b06SSteven Whitehouse 251b1e71b06SSteven Whitehouse lock_page(page); 252b1e71b06SSteven Whitehouse 253b1e71b06SSteven Whitehouse if (unlikely(page->mapping != mapping)) { 254b1e71b06SSteven Whitehouse unlock_page(page); 255b1e71b06SSteven Whitehouse continue; 256b1e71b06SSteven Whitehouse } 257b1e71b06SSteven Whitehouse 258b1e71b06SSteven Whitehouse if (!wbc->range_cyclic && page->index > end) { 259b1e71b06SSteven Whitehouse ret = 1; 260b1e71b06SSteven Whitehouse unlock_page(page); 261b1e71b06SSteven Whitehouse continue; 262b1e71b06SSteven Whitehouse } 263b1e71b06SSteven Whitehouse 264b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_NONE) 265b1e71b06SSteven Whitehouse wait_on_page_writeback(page); 266b1e71b06SSteven Whitehouse 267b1e71b06SSteven Whitehouse if (PageWriteback(page) || 268b1e71b06SSteven Whitehouse !clear_page_dirty_for_io(page)) { 269b1e71b06SSteven Whitehouse unlock_page(page); 270b1e71b06SSteven Whitehouse continue; 271b1e71b06SSteven Whitehouse } 272b1e71b06SSteven Whitehouse 273b1e71b06SSteven Whitehouse /* Is the page fully outside i_size? (truncate in progress) */ 274b1e71b06SSteven Whitehouse if (page->index > end_index || (page->index == end_index && !offset)) { 275d47992f8SLukas Czerner page->mapping->a_ops->invalidatepage(page, 0, 276d47992f8SLukas Czerner PAGE_CACHE_SIZE); 277b1e71b06SSteven Whitehouse unlock_page(page); 278b1e71b06SSteven Whitehouse continue; 279b1e71b06SSteven Whitehouse } 280b1e71b06SSteven Whitehouse 281b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 282b1e71b06SSteven Whitehouse 283b1e71b06SSteven Whitehouse if (ret || (--(wbc->nr_to_write) <= 0)) 284b1e71b06SSteven Whitehouse ret = 1; 285b1e71b06SSteven Whitehouse } 286b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 287b1e71b06SSteven Whitehouse return ret; 288b1e71b06SSteven Whitehouse } 289b1e71b06SSteven Whitehouse 290b1e71b06SSteven Whitehouse /** 291b1e71b06SSteven Whitehouse * gfs2_write_cache_jdata - Like write_cache_pages but different 292b1e71b06SSteven Whitehouse * @mapping: The mapping to write 293b1e71b06SSteven Whitehouse * @wbc: The writeback control 294b1e71b06SSteven Whitehouse * @writepage: The writepage function to call 295b1e71b06SSteven Whitehouse * @data: The data to pass to writepage 296b1e71b06SSteven Whitehouse * 297b1e71b06SSteven Whitehouse * The reason that we use our own function here is that we need to 298b1e71b06SSteven Whitehouse * start transactions before we grab page locks. This allows us 299b1e71b06SSteven Whitehouse * to get the ordering right. 300b1e71b06SSteven Whitehouse */ 301b1e71b06SSteven Whitehouse 302b1e71b06SSteven Whitehouse static int gfs2_write_cache_jdata(struct address_space *mapping, 303b1e71b06SSteven Whitehouse struct writeback_control *wbc) 304b1e71b06SSteven Whitehouse { 305b1e71b06SSteven Whitehouse int ret = 0; 306b1e71b06SSteven Whitehouse int done = 0; 307b1e71b06SSteven Whitehouse struct pagevec pvec; 308b1e71b06SSteven Whitehouse int nr_pages; 309b1e71b06SSteven Whitehouse pgoff_t index; 310b1e71b06SSteven Whitehouse pgoff_t end; 311b1e71b06SSteven Whitehouse int scanned = 0; 312b1e71b06SSteven Whitehouse int range_whole = 0; 313b1e71b06SSteven Whitehouse 314b1e71b06SSteven Whitehouse pagevec_init(&pvec, 0); 315b1e71b06SSteven Whitehouse if (wbc->range_cyclic) { 316b1e71b06SSteven Whitehouse index = mapping->writeback_index; /* Start from prev offset */ 317b1e71b06SSteven Whitehouse end = -1; 318b1e71b06SSteven Whitehouse } else { 319b1e71b06SSteven Whitehouse index = wbc->range_start >> PAGE_CACHE_SHIFT; 320b1e71b06SSteven Whitehouse end = wbc->range_end >> PAGE_CACHE_SHIFT; 321b1e71b06SSteven Whitehouse if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 322b1e71b06SSteven Whitehouse range_whole = 1; 323b1e71b06SSteven Whitehouse scanned = 1; 324b1e71b06SSteven Whitehouse } 325b1e71b06SSteven Whitehouse 326b1e71b06SSteven Whitehouse retry: 327b1e71b06SSteven Whitehouse while (!done && (index <= end) && 328b1e71b06SSteven Whitehouse (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, 329b1e71b06SSteven Whitehouse PAGECACHE_TAG_DIRTY, 330b1e71b06SSteven Whitehouse min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { 331b1e71b06SSteven Whitehouse scanned = 1; 332b1e71b06SSteven Whitehouse ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end); 333b1e71b06SSteven Whitehouse if (ret) 334b1e71b06SSteven Whitehouse done = 1; 335b1e71b06SSteven Whitehouse if (ret > 0) 336b1e71b06SSteven Whitehouse ret = 0; 337b1e71b06SSteven Whitehouse 338b1e71b06SSteven Whitehouse pagevec_release(&pvec); 339b1e71b06SSteven Whitehouse cond_resched(); 340b1e71b06SSteven Whitehouse } 341b1e71b06SSteven Whitehouse 342b1e71b06SSteven Whitehouse if (!scanned && !done) { 343b1e71b06SSteven Whitehouse /* 344b1e71b06SSteven Whitehouse * We hit the last page and there is more work to be done: wrap 345b1e71b06SSteven Whitehouse * back to the start of the file 346b1e71b06SSteven Whitehouse */ 347b1e71b06SSteven Whitehouse scanned = 1; 348b1e71b06SSteven Whitehouse index = 0; 349b1e71b06SSteven Whitehouse goto retry; 350b1e71b06SSteven Whitehouse } 351b1e71b06SSteven Whitehouse 352b1e71b06SSteven Whitehouse if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 353b1e71b06SSteven Whitehouse mapping->writeback_index = index; 354b1e71b06SSteven Whitehouse return ret; 355b1e71b06SSteven Whitehouse } 356b1e71b06SSteven Whitehouse 357b1e71b06SSteven Whitehouse 358b1e71b06SSteven Whitehouse /** 359b1e71b06SSteven Whitehouse * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk 360b1e71b06SSteven Whitehouse * @mapping: The mapping to write 361b1e71b06SSteven Whitehouse * @wbc: The writeback control 362b1e71b06SSteven Whitehouse * 363b1e71b06SSteven Whitehouse */ 364b1e71b06SSteven Whitehouse 365b1e71b06SSteven Whitehouse static int gfs2_jdata_writepages(struct address_space *mapping, 366b1e71b06SSteven Whitehouse struct writeback_control *wbc) 367b1e71b06SSteven Whitehouse { 368b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 369b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 370b1e71b06SSteven Whitehouse int ret; 371b1e71b06SSteven Whitehouse 372b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 373b1e71b06SSteven Whitehouse if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { 374b1e71b06SSteven Whitehouse gfs2_log_flush(sdp, ip->i_gl); 375b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 376b1e71b06SSteven Whitehouse } 377b1e71b06SSteven Whitehouse return ret; 378b1e71b06SSteven Whitehouse } 379b1e71b06SSteven Whitehouse 380b1e71b06SSteven Whitehouse /** 381b1e71b06SSteven Whitehouse * stuffed_readpage - Fill in a Linux page with stuffed file data 382b1e71b06SSteven Whitehouse * @ip: the inode 383b1e71b06SSteven Whitehouse * @page: the page 384b1e71b06SSteven Whitehouse * 385b1e71b06SSteven Whitehouse * Returns: errno 386b1e71b06SSteven Whitehouse */ 387b1e71b06SSteven Whitehouse 388b1e71b06SSteven Whitehouse static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) 389b1e71b06SSteven Whitehouse { 390b1e71b06SSteven Whitehouse struct buffer_head *dibh; 391602c89d2SSteven Whitehouse u64 dsize = i_size_read(&ip->i_inode); 392b1e71b06SSteven Whitehouse void *kaddr; 393b1e71b06SSteven Whitehouse int error; 394b1e71b06SSteven Whitehouse 395b1e71b06SSteven Whitehouse /* 396b1e71b06SSteven Whitehouse * Due to the order of unstuffing files and ->fault(), we can be 397b1e71b06SSteven Whitehouse * asked for a zero page in the case of a stuffed file being extended, 398b1e71b06SSteven Whitehouse * so we need to supply one here. It doesn't happen often. 399b1e71b06SSteven Whitehouse */ 400b1e71b06SSteven Whitehouse if (unlikely(page->index)) { 401b1e71b06SSteven Whitehouse zero_user(page, 0, PAGE_CACHE_SIZE); 402b1e71b06SSteven Whitehouse SetPageUptodate(page); 403b1e71b06SSteven Whitehouse return 0; 404b1e71b06SSteven Whitehouse } 405b1e71b06SSteven Whitehouse 406b1e71b06SSteven Whitehouse error = gfs2_meta_inode_buffer(ip, &dibh); 407b1e71b06SSteven Whitehouse if (error) 408b1e71b06SSteven Whitehouse return error; 409b1e71b06SSteven Whitehouse 410d9349285SCong Wang kaddr = kmap_atomic(page); 411602c89d2SSteven Whitehouse if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode))) 412602c89d2SSteven Whitehouse dsize = (dibh->b_size - sizeof(struct gfs2_dinode)); 413602c89d2SSteven Whitehouse memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); 414602c89d2SSteven Whitehouse memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize); 415d9349285SCong Wang kunmap_atomic(kaddr); 416b1e71b06SSteven Whitehouse flush_dcache_page(page); 417b1e71b06SSteven Whitehouse brelse(dibh); 418b1e71b06SSteven Whitehouse SetPageUptodate(page); 419b1e71b06SSteven Whitehouse 420b1e71b06SSteven Whitehouse return 0; 421b1e71b06SSteven Whitehouse } 422b1e71b06SSteven Whitehouse 423b1e71b06SSteven Whitehouse 424b1e71b06SSteven Whitehouse /** 425b1e71b06SSteven Whitehouse * __gfs2_readpage - readpage 426b1e71b06SSteven Whitehouse * @file: The file to read a page for 427b1e71b06SSteven Whitehouse * @page: The page to read 428b1e71b06SSteven Whitehouse * 429b1e71b06SSteven Whitehouse * This is the core of gfs2's readpage. Its used by the internal file 430b1e71b06SSteven Whitehouse * reading code as in that case we already hold the glock. Also its 431b1e71b06SSteven Whitehouse * called by gfs2_readpage() once the required lock has been granted. 432b1e71b06SSteven Whitehouse * 433b1e71b06SSteven Whitehouse */ 434b1e71b06SSteven Whitehouse 435b1e71b06SSteven Whitehouse static int __gfs2_readpage(void *file, struct page *page) 436b1e71b06SSteven Whitehouse { 437b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(page->mapping->host); 438b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 439b1e71b06SSteven Whitehouse int error; 440b1e71b06SSteven Whitehouse 441b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 442b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 443b1e71b06SSteven Whitehouse unlock_page(page); 444b1e71b06SSteven Whitehouse } else { 445b1e71b06SSteven Whitehouse error = mpage_readpage(page, gfs2_block_map); 446b1e71b06SSteven Whitehouse } 447b1e71b06SSteven Whitehouse 448b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 449b1e71b06SSteven Whitehouse return -EIO; 450b1e71b06SSteven Whitehouse 451b1e71b06SSteven Whitehouse return error; 452b1e71b06SSteven Whitehouse } 453b1e71b06SSteven Whitehouse 454b1e71b06SSteven Whitehouse /** 455b1e71b06SSteven Whitehouse * gfs2_readpage - read a page of a file 456b1e71b06SSteven Whitehouse * @file: The file to read 457b1e71b06SSteven Whitehouse * @page: The page of the file 458b1e71b06SSteven Whitehouse * 459b1e71b06SSteven Whitehouse * This deals with the locking required. We have to unlock and 460b1e71b06SSteven Whitehouse * relock the page in order to get the locking in the right 461b1e71b06SSteven Whitehouse * order. 462b1e71b06SSteven Whitehouse */ 463b1e71b06SSteven Whitehouse 464b1e71b06SSteven Whitehouse static int gfs2_readpage(struct file *file, struct page *page) 465b1e71b06SSteven Whitehouse { 466b1e71b06SSteven Whitehouse struct address_space *mapping = page->mapping; 467b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 468b1e71b06SSteven Whitehouse struct gfs2_holder gh; 469b1e71b06SSteven Whitehouse int error; 470b1e71b06SSteven Whitehouse 471b1e71b06SSteven Whitehouse unlock_page(page); 472b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 473b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&gh); 474b1e71b06SSteven Whitehouse if (unlikely(error)) 475b1e71b06SSteven Whitehouse goto out; 476b1e71b06SSteven Whitehouse error = AOP_TRUNCATED_PAGE; 477b1e71b06SSteven Whitehouse lock_page(page); 478b1e71b06SSteven Whitehouse if (page->mapping == mapping && !PageUptodate(page)) 479b1e71b06SSteven Whitehouse error = __gfs2_readpage(file, page); 480b1e71b06SSteven Whitehouse else 481b1e71b06SSteven Whitehouse unlock_page(page); 482b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 483b1e71b06SSteven Whitehouse out: 484b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 485b1e71b06SSteven Whitehouse if (error && error != AOP_TRUNCATED_PAGE) 486b1e71b06SSteven Whitehouse lock_page(page); 487b1e71b06SSteven Whitehouse return error; 488b1e71b06SSteven Whitehouse } 489b1e71b06SSteven Whitehouse 490b1e71b06SSteven Whitehouse /** 491b1e71b06SSteven Whitehouse * gfs2_internal_read - read an internal file 492b1e71b06SSteven Whitehouse * @ip: The gfs2 inode 493b1e71b06SSteven Whitehouse * @buf: The buffer to fill 494b1e71b06SSteven Whitehouse * @pos: The file position 495b1e71b06SSteven Whitehouse * @size: The amount to read 496b1e71b06SSteven Whitehouse * 497b1e71b06SSteven Whitehouse */ 498b1e71b06SSteven Whitehouse 4994306629eSAndrew Price int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, 5004306629eSAndrew Price unsigned size) 501b1e71b06SSteven Whitehouse { 502b1e71b06SSteven Whitehouse struct address_space *mapping = ip->i_inode.i_mapping; 503b1e71b06SSteven Whitehouse unsigned long index = *pos / PAGE_CACHE_SIZE; 504b1e71b06SSteven Whitehouse unsigned offset = *pos & (PAGE_CACHE_SIZE - 1); 505b1e71b06SSteven Whitehouse unsigned copied = 0; 506b1e71b06SSteven Whitehouse unsigned amt; 507b1e71b06SSteven Whitehouse struct page *page; 508b1e71b06SSteven Whitehouse void *p; 509b1e71b06SSteven Whitehouse 510b1e71b06SSteven Whitehouse do { 511b1e71b06SSteven Whitehouse amt = size - copied; 512b1e71b06SSteven Whitehouse if (offset + size > PAGE_CACHE_SIZE) 513b1e71b06SSteven Whitehouse amt = PAGE_CACHE_SIZE - offset; 514b1e71b06SSteven Whitehouse page = read_cache_page(mapping, index, __gfs2_readpage, NULL); 515b1e71b06SSteven Whitehouse if (IS_ERR(page)) 516b1e71b06SSteven Whitehouse return PTR_ERR(page); 517d9349285SCong Wang p = kmap_atomic(page); 518b1e71b06SSteven Whitehouse memcpy(buf + copied, p + offset, amt); 519d9349285SCong Wang kunmap_atomic(p); 520b1e71b06SSteven Whitehouse mark_page_accessed(page); 521b1e71b06SSteven Whitehouse page_cache_release(page); 522b1e71b06SSteven Whitehouse copied += amt; 523b1e71b06SSteven Whitehouse index++; 524b1e71b06SSteven Whitehouse offset = 0; 525b1e71b06SSteven Whitehouse } while(copied < size); 526b1e71b06SSteven Whitehouse (*pos) += size; 527b1e71b06SSteven Whitehouse return size; 528b1e71b06SSteven Whitehouse } 529b1e71b06SSteven Whitehouse 530b1e71b06SSteven Whitehouse /** 531b1e71b06SSteven Whitehouse * gfs2_readpages - Read a bunch of pages at once 532b1e71b06SSteven Whitehouse * 533b1e71b06SSteven Whitehouse * Some notes: 534b1e71b06SSteven Whitehouse * 1. This is only for readahead, so we can simply ignore any things 535b1e71b06SSteven Whitehouse * which are slightly inconvenient (such as locking conflicts between 536b1e71b06SSteven Whitehouse * the page lock and the glock) and return having done no I/O. Its 537b1e71b06SSteven Whitehouse * obviously not something we'd want to do on too regular a basis. 538b1e71b06SSteven Whitehouse * Any I/O we ignore at this time will be done via readpage later. 539b1e71b06SSteven Whitehouse * 2. We don't handle stuffed files here we let readpage do the honours. 540b1e71b06SSteven Whitehouse * 3. mpage_readpages() does most of the heavy lifting in the common case. 541b1e71b06SSteven Whitehouse * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. 542b1e71b06SSteven Whitehouse */ 543b1e71b06SSteven Whitehouse 544b1e71b06SSteven Whitehouse static int gfs2_readpages(struct file *file, struct address_space *mapping, 545b1e71b06SSteven Whitehouse struct list_head *pages, unsigned nr_pages) 546b1e71b06SSteven Whitehouse { 547b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 548b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 549b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 550b1e71b06SSteven Whitehouse struct gfs2_holder gh; 551b1e71b06SSteven Whitehouse int ret; 552b1e71b06SSteven Whitehouse 553b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 554b1e71b06SSteven Whitehouse ret = gfs2_glock_nq(&gh); 555b1e71b06SSteven Whitehouse if (unlikely(ret)) 556b1e71b06SSteven Whitehouse goto out_uninit; 557b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 558b1e71b06SSteven Whitehouse ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); 559b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 560b1e71b06SSteven Whitehouse out_uninit: 561b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 562b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 563b1e71b06SSteven Whitehouse ret = -EIO; 564b1e71b06SSteven Whitehouse return ret; 565b1e71b06SSteven Whitehouse } 566b1e71b06SSteven Whitehouse 567b1e71b06SSteven Whitehouse /** 568b1e71b06SSteven Whitehouse * gfs2_write_begin - Begin to write to a file 569b1e71b06SSteven Whitehouse * @file: The file to write to 570b1e71b06SSteven Whitehouse * @mapping: The mapping in which to write 571b1e71b06SSteven Whitehouse * @pos: The file offset at which to start writing 572b1e71b06SSteven Whitehouse * @len: Length of the write 573b1e71b06SSteven Whitehouse * @flags: Various flags 574b1e71b06SSteven Whitehouse * @pagep: Pointer to return the page 575b1e71b06SSteven Whitehouse * @fsdata: Pointer to return fs data (unused by GFS2) 576b1e71b06SSteven Whitehouse * 577b1e71b06SSteven Whitehouse * Returns: errno 578b1e71b06SSteven Whitehouse */ 579b1e71b06SSteven Whitehouse 580b1e71b06SSteven Whitehouse static int gfs2_write_begin(struct file *file, struct address_space *mapping, 581b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned flags, 582b1e71b06SSteven Whitehouse struct page **pagep, void **fsdata) 583b1e71b06SSteven Whitehouse { 584b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 585b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 5861946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 587b1e71b06SSteven Whitehouse unsigned int data_blocks = 0, ind_blocks = 0, rblocks; 58871f890f7SSteven Whitehouse unsigned requested = 0; 589b1e71b06SSteven Whitehouse int alloc_required; 590b1e71b06SSteven Whitehouse int error = 0; 591b1e71b06SSteven Whitehouse pgoff_t index = pos >> PAGE_CACHE_SHIFT; 592b1e71b06SSteven Whitehouse unsigned from = pos & (PAGE_CACHE_SIZE - 1); 593b1e71b06SSteven Whitehouse struct page *page; 594b1e71b06SSteven Whitehouse 595b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); 596b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&ip->i_gh); 597b1e71b06SSteven Whitehouse if (unlikely(error)) 598b1e71b06SSteven Whitehouse goto out_uninit; 5991946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 6001946f70aSBenjamin Marzinski error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 6011946f70aSBenjamin Marzinski GL_NOCACHE, &m_ip->i_gh); 6021946f70aSBenjamin Marzinski if (unlikely(error)) { 6031946f70aSBenjamin Marzinski gfs2_glock_dq(&ip->i_gh); 6041946f70aSBenjamin Marzinski goto out_uninit; 6051946f70aSBenjamin Marzinski } 6061946f70aSBenjamin Marzinski } 607b1e71b06SSteven Whitehouse 608461cb419SBob Peterson alloc_required = gfs2_write_alloc_required(ip, pos, len); 609b1e71b06SSteven Whitehouse 610b1e71b06SSteven Whitehouse if (alloc_required || gfs2_is_jdata(ip)) 611b1e71b06SSteven Whitehouse gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); 612b1e71b06SSteven Whitehouse 613b1e71b06SSteven Whitehouse if (alloc_required) { 6147b9cff46SSteven Whitehouse struct gfs2_alloc_parms ap = { .aflags = 0, }; 615b1e71b06SSteven Whitehouse error = gfs2_quota_lock_check(ip); 616b1e71b06SSteven Whitehouse if (error) 6175407e242SBob Peterson goto out_unlock; 618b1e71b06SSteven Whitehouse 61971f890f7SSteven Whitehouse requested = data_blocks + ind_blocks; 6207b9cff46SSteven Whitehouse ap.target = requested; 6217b9cff46SSteven Whitehouse error = gfs2_inplace_reserve(ip, &ap); 622b1e71b06SSteven Whitehouse if (error) 623b1e71b06SSteven Whitehouse goto out_qunlock; 624b1e71b06SSteven Whitehouse } 625b1e71b06SSteven Whitehouse 626b1e71b06SSteven Whitehouse rblocks = RES_DINODE + ind_blocks; 627b1e71b06SSteven Whitehouse if (gfs2_is_jdata(ip)) 628b1e71b06SSteven Whitehouse rblocks += data_blocks ? data_blocks : 1; 629b1e71b06SSteven Whitehouse if (ind_blocks || data_blocks) 630b1e71b06SSteven Whitehouse rblocks += RES_STATFS + RES_QUOTA; 6311946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) 6321946f70aSBenjamin Marzinski rblocks += 2 * RES_STATFS; 633bf97b673SBenjamin Marzinski if (alloc_required) 63471f890f7SSteven Whitehouse rblocks += gfs2_rg_blocks(ip, requested); 635b1e71b06SSteven Whitehouse 636b1e71b06SSteven Whitehouse error = gfs2_trans_begin(sdp, rblocks, 637b1e71b06SSteven Whitehouse PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); 638b1e71b06SSteven Whitehouse if (error) 639b1e71b06SSteven Whitehouse goto out_trans_fail; 640b1e71b06SSteven Whitehouse 641b1e71b06SSteven Whitehouse error = -ENOMEM; 642b1e71b06SSteven Whitehouse flags |= AOP_FLAG_NOFS; 643b1e71b06SSteven Whitehouse page = grab_cache_page_write_begin(mapping, index, flags); 644b1e71b06SSteven Whitehouse *pagep = page; 645b1e71b06SSteven Whitehouse if (unlikely(!page)) 646b1e71b06SSteven Whitehouse goto out_endtrans; 647b1e71b06SSteven Whitehouse 648b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 649b1e71b06SSteven Whitehouse error = 0; 650b1e71b06SSteven Whitehouse if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { 651b1e71b06SSteven Whitehouse error = gfs2_unstuff_dinode(ip, page); 652b1e71b06SSteven Whitehouse if (error == 0) 653b1e71b06SSteven Whitehouse goto prepare_write; 654b1e71b06SSteven Whitehouse } else if (!PageUptodate(page)) { 655b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 656b1e71b06SSteven Whitehouse } 657b1e71b06SSteven Whitehouse goto out; 658b1e71b06SSteven Whitehouse } 659b1e71b06SSteven Whitehouse 660b1e71b06SSteven Whitehouse prepare_write: 661ebdec241SChristoph Hellwig error = __block_write_begin(page, from, len, gfs2_block_map); 662b1e71b06SSteven Whitehouse out: 663b1e71b06SSteven Whitehouse if (error == 0) 664b1e71b06SSteven Whitehouse return 0; 665b1e71b06SSteven Whitehouse 6666c474f7bSMaxim unlock_page(page); 667b1e71b06SSteven Whitehouse page_cache_release(page); 66815c6fd97Snpiggin@suse.de 669ff8f33c8SSteven Whitehouse gfs2_trans_end(sdp); 670b1e71b06SSteven Whitehouse if (pos + len > ip->i_inode.i_size) 671ff8f33c8SSteven Whitehouse gfs2_trim_blocks(&ip->i_inode); 672ff8f33c8SSteven Whitehouse goto out_trans_fail; 673ff8f33c8SSteven Whitehouse 674b1e71b06SSteven Whitehouse out_endtrans: 675b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 676b1e71b06SSteven Whitehouse out_trans_fail: 677b1e71b06SSteven Whitehouse if (alloc_required) { 678b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 679b1e71b06SSteven Whitehouse out_qunlock: 680b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 681b1e71b06SSteven Whitehouse } 682b1e71b06SSteven Whitehouse out_unlock: 6831946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 6841946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 6851946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 6861946f70aSBenjamin Marzinski } 687b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 688b1e71b06SSteven Whitehouse out_uninit: 689b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 690b1e71b06SSteven Whitehouse return error; 691b1e71b06SSteven Whitehouse } 692b1e71b06SSteven Whitehouse 693b1e71b06SSteven Whitehouse /** 694b1e71b06SSteven Whitehouse * adjust_fs_space - Adjusts the free space available due to gfs2_grow 695b1e71b06SSteven Whitehouse * @inode: the rindex inode 696b1e71b06SSteven Whitehouse */ 697b1e71b06SSteven Whitehouse static void adjust_fs_space(struct inode *inode) 698b1e71b06SSteven Whitehouse { 699b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; 7001946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 7011946f70aSBenjamin Marzinski struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 702b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 703b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 7041946f70aSBenjamin Marzinski struct buffer_head *m_bh, *l_bh; 705b1e71b06SSteven Whitehouse u64 fs_total, new_free; 706b1e71b06SSteven Whitehouse 707b1e71b06SSteven Whitehouse /* Total up the file system space, according to the latest rindex. */ 708b1e71b06SSteven Whitehouse fs_total = gfs2_ri_total(sdp); 7091946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) 7101946f70aSBenjamin Marzinski return; 711b1e71b06SSteven Whitehouse 712b1e71b06SSteven Whitehouse spin_lock(&sdp->sd_statfs_spin); 7131946f70aSBenjamin Marzinski gfs2_statfs_change_in(m_sc, m_bh->b_data + 7141946f70aSBenjamin Marzinski sizeof(struct gfs2_dinode)); 715b1e71b06SSteven Whitehouse if (fs_total > (m_sc->sc_total + l_sc->sc_total)) 716b1e71b06SSteven Whitehouse new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); 717b1e71b06SSteven Whitehouse else 718b1e71b06SSteven Whitehouse new_free = 0; 719b1e71b06SSteven Whitehouse spin_unlock(&sdp->sd_statfs_spin); 720b1e71b06SSteven Whitehouse fs_warn(sdp, "File system extended by %llu blocks.\n", 721b1e71b06SSteven Whitehouse (unsigned long long)new_free); 722b1e71b06SSteven Whitehouse gfs2_statfs_change(sdp, new_free, new_free, 0); 7231946f70aSBenjamin Marzinski 7241946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) 7251946f70aSBenjamin Marzinski goto out; 7261946f70aSBenjamin Marzinski update_statfs(sdp, m_bh, l_bh); 7271946f70aSBenjamin Marzinski brelse(l_bh); 7281946f70aSBenjamin Marzinski out: 7291946f70aSBenjamin Marzinski brelse(m_bh); 730b1e71b06SSteven Whitehouse } 731b1e71b06SSteven Whitehouse 732b1e71b06SSteven Whitehouse /** 733b1e71b06SSteven Whitehouse * gfs2_stuffed_write_end - Write end for stuffed files 734b1e71b06SSteven Whitehouse * @inode: The inode 735b1e71b06SSteven Whitehouse * @dibh: The buffer_head containing the on-disk inode 736b1e71b06SSteven Whitehouse * @pos: The file position 737b1e71b06SSteven Whitehouse * @len: The length of the write 738b1e71b06SSteven Whitehouse * @copied: How much was actually copied by the VFS 739b1e71b06SSteven Whitehouse * @page: The page 740b1e71b06SSteven Whitehouse * 741b1e71b06SSteven Whitehouse * This copies the data from the page into the inode block after 742b1e71b06SSteven Whitehouse * the inode data structure itself. 743b1e71b06SSteven Whitehouse * 744b1e71b06SSteven Whitehouse * Returns: errno 745b1e71b06SSteven Whitehouse */ 746b1e71b06SSteven Whitehouse static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, 747b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 748b1e71b06SSteven Whitehouse struct page *page) 749b1e71b06SSteven Whitehouse { 750b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 751b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 7521946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 753b1e71b06SSteven Whitehouse u64 to = pos + copied; 754b1e71b06SSteven Whitehouse void *kaddr; 755b1e71b06SSteven Whitehouse unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); 756b1e71b06SSteven Whitehouse 757b1e71b06SSteven Whitehouse BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode))); 758d9349285SCong Wang kaddr = kmap_atomic(page); 759b1e71b06SSteven Whitehouse memcpy(buf + pos, kaddr + pos, copied); 760b1e71b06SSteven Whitehouse memset(kaddr + pos + copied, 0, len - copied); 761b1e71b06SSteven Whitehouse flush_dcache_page(page); 762d9349285SCong Wang kunmap_atomic(kaddr); 763b1e71b06SSteven Whitehouse 764b1e71b06SSteven Whitehouse if (!PageUptodate(page)) 765b1e71b06SSteven Whitehouse SetPageUptodate(page); 766b1e71b06SSteven Whitehouse unlock_page(page); 767b1e71b06SSteven Whitehouse page_cache_release(page); 768b1e71b06SSteven Whitehouse 769b1e71b06SSteven Whitehouse if (copied) { 770a2e0f799SSteven Whitehouse if (inode->i_size < to) 771b1e71b06SSteven Whitehouse i_size_write(inode, to); 772b1e71b06SSteven Whitehouse mark_inode_dirty(inode); 773b1e71b06SSteven Whitehouse } 774b1e71b06SSteven Whitehouse 7759ae3c6deSBenjamin Marzinski if (inode == sdp->sd_rindex) { 776b1e71b06SSteven Whitehouse adjust_fs_space(inode); 777ca9248d8SBob Peterson sdp->sd_rindex_uptodate = 0; 7789ae3c6deSBenjamin Marzinski } 779b1e71b06SSteven Whitehouse 780b1e71b06SSteven Whitehouse brelse(dibh); 781b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 7821946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 7831946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 7841946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 7851946f70aSBenjamin Marzinski } 786b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 787b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 788b1e71b06SSteven Whitehouse return copied; 789b1e71b06SSteven Whitehouse } 790b1e71b06SSteven Whitehouse 791b1e71b06SSteven Whitehouse /** 792b1e71b06SSteven Whitehouse * gfs2_write_end 793b1e71b06SSteven Whitehouse * @file: The file to write to 794b1e71b06SSteven Whitehouse * @mapping: The address space to write to 795b1e71b06SSteven Whitehouse * @pos: The file position 796b1e71b06SSteven Whitehouse * @len: The length of the data 797b1e71b06SSteven Whitehouse * @copied: 798b1e71b06SSteven Whitehouse * @page: The page that has been written 799b1e71b06SSteven Whitehouse * @fsdata: The fsdata (unused in GFS2) 800b1e71b06SSteven Whitehouse * 801b1e71b06SSteven Whitehouse * The main write_end function for GFS2. We have a separate one for 802b1e71b06SSteven Whitehouse * stuffed files as they are slightly different, otherwise we just 803b1e71b06SSteven Whitehouse * put our locking around the VFS provided functions. 804b1e71b06SSteven Whitehouse * 805b1e71b06SSteven Whitehouse * Returns: errno 806b1e71b06SSteven Whitehouse */ 807b1e71b06SSteven Whitehouse 808b1e71b06SSteven Whitehouse static int gfs2_write_end(struct file *file, struct address_space *mapping, 809b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 810b1e71b06SSteven Whitehouse struct page *page, void *fsdata) 811b1e71b06SSteven Whitehouse { 812b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 813b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 814b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 8151946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 816b1e71b06SSteven Whitehouse struct buffer_head *dibh; 817b1e71b06SSteven Whitehouse unsigned int from = pos & (PAGE_CACHE_SIZE - 1); 818b1e71b06SSteven Whitehouse unsigned int to = from + len; 819b1e71b06SSteven Whitehouse int ret; 8200c901809SBenjamin Marzinski struct gfs2_trans *tr = current->journal_info; 8210c901809SBenjamin Marzinski BUG_ON(!tr); 822b1e71b06SSteven Whitehouse 823b1e71b06SSteven Whitehouse BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); 824b1e71b06SSteven Whitehouse 825b1e71b06SSteven Whitehouse ret = gfs2_meta_inode_buffer(ip, &dibh); 826b1e71b06SSteven Whitehouse if (unlikely(ret)) { 827b1e71b06SSteven Whitehouse unlock_page(page); 828b1e71b06SSteven Whitehouse page_cache_release(page); 829b1e71b06SSteven Whitehouse goto failed; 830b1e71b06SSteven Whitehouse } 831b1e71b06SSteven Whitehouse 832b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 833b1e71b06SSteven Whitehouse return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); 834b1e71b06SSteven Whitehouse 835b1e71b06SSteven Whitehouse if (!gfs2_is_writeback(ip)) 836b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, from, to); 837b1e71b06SSteven Whitehouse 838b1e71b06SSteven Whitehouse ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); 8390c901809SBenjamin Marzinski if (tr->tr_num_buf_new) 8400c901809SBenjamin Marzinski __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 8410c901809SBenjamin Marzinski else 8420c901809SBenjamin Marzinski gfs2_trans_add_meta(ip->i_gl, dibh); 8430c901809SBenjamin Marzinski 844b1e71b06SSteven Whitehouse 8459ae3c6deSBenjamin Marzinski if (inode == sdp->sd_rindex) { 846b1e71b06SSteven Whitehouse adjust_fs_space(inode); 847ca9248d8SBob Peterson sdp->sd_rindex_uptodate = 0; 8489ae3c6deSBenjamin Marzinski } 849b1e71b06SSteven Whitehouse 850b1e71b06SSteven Whitehouse brelse(dibh); 851b1e71b06SSteven Whitehouse failed: 852deab72d3SBob Peterson gfs2_trans_end(sdp); 853b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 8545407e242SBob Peterson if (ip->i_res->rs_qa_qd_num) 855b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 8561946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 8571946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 8581946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 8591946f70aSBenjamin Marzinski } 860b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 861b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 862b1e71b06SSteven Whitehouse return ret; 863b1e71b06SSteven Whitehouse } 864b1e71b06SSteven Whitehouse 865b1e71b06SSteven Whitehouse /** 866b1e71b06SSteven Whitehouse * gfs2_set_page_dirty - Page dirtying function 867b1e71b06SSteven Whitehouse * @page: The page to dirty 868b1e71b06SSteven Whitehouse * 869b1e71b06SSteven Whitehouse * Returns: 1 if it dirtyed the page, or 0 otherwise 870b1e71b06SSteven Whitehouse */ 871b1e71b06SSteven Whitehouse 872b1e71b06SSteven Whitehouse static int gfs2_set_page_dirty(struct page *page) 873b1e71b06SSteven Whitehouse { 874b1e71b06SSteven Whitehouse SetPageChecked(page); 875b1e71b06SSteven Whitehouse return __set_page_dirty_buffers(page); 876b1e71b06SSteven Whitehouse } 877b1e71b06SSteven Whitehouse 878b1e71b06SSteven Whitehouse /** 879b1e71b06SSteven Whitehouse * gfs2_bmap - Block map function 880b1e71b06SSteven Whitehouse * @mapping: Address space info 881b1e71b06SSteven Whitehouse * @lblock: The block to map 882b1e71b06SSteven Whitehouse * 883b1e71b06SSteven Whitehouse * Returns: The disk address for the block or 0 on hole or error 884b1e71b06SSteven Whitehouse */ 885b1e71b06SSteven Whitehouse 886b1e71b06SSteven Whitehouse static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) 887b1e71b06SSteven Whitehouse { 888b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 889b1e71b06SSteven Whitehouse struct gfs2_holder i_gh; 890b1e71b06SSteven Whitehouse sector_t dblock = 0; 891b1e71b06SSteven Whitehouse int error; 892b1e71b06SSteven Whitehouse 893b1e71b06SSteven Whitehouse error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 894b1e71b06SSteven Whitehouse if (error) 895b1e71b06SSteven Whitehouse return 0; 896b1e71b06SSteven Whitehouse 897b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 898b1e71b06SSteven Whitehouse dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); 899b1e71b06SSteven Whitehouse 900b1e71b06SSteven Whitehouse gfs2_glock_dq_uninit(&i_gh); 901b1e71b06SSteven Whitehouse 902b1e71b06SSteven Whitehouse return dblock; 903b1e71b06SSteven Whitehouse } 904b1e71b06SSteven Whitehouse 905b1e71b06SSteven Whitehouse static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) 906b1e71b06SSteven Whitehouse { 907b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 908b1e71b06SSteven Whitehouse 909b1e71b06SSteven Whitehouse lock_buffer(bh); 910b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 911b1e71b06SSteven Whitehouse clear_buffer_dirty(bh); 912b1e71b06SSteven Whitehouse bd = bh->b_private; 913b1e71b06SSteven Whitehouse if (bd) { 914c0752aa7SBob Peterson if (!list_empty(&bd->bd_list) && !buffer_pinned(bh)) 915c0752aa7SBob Peterson list_del_init(&bd->bd_list); 916b1e71b06SSteven Whitehouse else 917b1e71b06SSteven Whitehouse gfs2_remove_from_journal(bh, current->journal_info, 0); 918b1e71b06SSteven Whitehouse } 919b1e71b06SSteven Whitehouse bh->b_bdev = NULL; 920b1e71b06SSteven Whitehouse clear_buffer_mapped(bh); 921b1e71b06SSteven Whitehouse clear_buffer_req(bh); 922b1e71b06SSteven Whitehouse clear_buffer_new(bh); 923b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 924b1e71b06SSteven Whitehouse unlock_buffer(bh); 925b1e71b06SSteven Whitehouse } 926b1e71b06SSteven Whitehouse 927d47992f8SLukas Czerner static void gfs2_invalidatepage(struct page *page, unsigned int offset, 928d47992f8SLukas Czerner unsigned int length) 929b1e71b06SSteven Whitehouse { 930b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 9315c0bb97cSLukas Czerner unsigned int stop = offset + length; 9325c0bb97cSLukas Czerner int partial_page = (offset || length < PAGE_CACHE_SIZE); 933b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 934b1e71b06SSteven Whitehouse unsigned long pos = 0; 935b1e71b06SSteven Whitehouse 936b1e71b06SSteven Whitehouse BUG_ON(!PageLocked(page)); 9375c0bb97cSLukas Czerner if (!partial_page) 938b1e71b06SSteven Whitehouse ClearPageChecked(page); 939b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 940b1e71b06SSteven Whitehouse goto out; 941b1e71b06SSteven Whitehouse 942b1e71b06SSteven Whitehouse bh = head = page_buffers(page); 943b1e71b06SSteven Whitehouse do { 9445c0bb97cSLukas Czerner if (pos + bh->b_size > stop) 9455c0bb97cSLukas Czerner return; 9465c0bb97cSLukas Czerner 947b1e71b06SSteven Whitehouse if (offset <= pos) 948b1e71b06SSteven Whitehouse gfs2_discard(sdp, bh); 949b1e71b06SSteven Whitehouse pos += bh->b_size; 950b1e71b06SSteven Whitehouse bh = bh->b_this_page; 951b1e71b06SSteven Whitehouse } while (bh != head); 952b1e71b06SSteven Whitehouse out: 9535c0bb97cSLukas Czerner if (!partial_page) 954b1e71b06SSteven Whitehouse try_to_release_page(page, 0); 955b1e71b06SSteven Whitehouse } 956b1e71b06SSteven Whitehouse 957b1e71b06SSteven Whitehouse /** 958b1e71b06SSteven Whitehouse * gfs2_ok_for_dio - check that dio is valid on this file 959b1e71b06SSteven Whitehouse * @ip: The inode 960b1e71b06SSteven Whitehouse * @rw: READ or WRITE 961b1e71b06SSteven Whitehouse * @offset: The offset at which we are reading or writing 962b1e71b06SSteven Whitehouse * 963b1e71b06SSteven Whitehouse * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) 964b1e71b06SSteven Whitehouse * 1 (to accept the i/o request) 965b1e71b06SSteven Whitehouse */ 966b1e71b06SSteven Whitehouse static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset) 967b1e71b06SSteven Whitehouse { 968b1e71b06SSteven Whitehouse /* 969b1e71b06SSteven Whitehouse * Should we return an error here? I can't see that O_DIRECT for 970b1e71b06SSteven Whitehouse * a stuffed file makes any sense. For now we'll silently fall 971b1e71b06SSteven Whitehouse * back to buffered I/O 972b1e71b06SSteven Whitehouse */ 973b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 974b1e71b06SSteven Whitehouse return 0; 975b1e71b06SSteven Whitehouse 976b1e71b06SSteven Whitehouse if (offset >= i_size_read(&ip->i_inode)) 977b1e71b06SSteven Whitehouse return 0; 978b1e71b06SSteven Whitehouse return 1; 979b1e71b06SSteven Whitehouse } 980b1e71b06SSteven Whitehouse 981b1e71b06SSteven Whitehouse 982b1e71b06SSteven Whitehouse 983b1e71b06SSteven Whitehouse static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, 984b1e71b06SSteven Whitehouse const struct iovec *iov, loff_t offset, 985b1e71b06SSteven Whitehouse unsigned long nr_segs) 986b1e71b06SSteven Whitehouse { 987b1e71b06SSteven Whitehouse struct file *file = iocb->ki_filp; 988b1e71b06SSteven Whitehouse struct inode *inode = file->f_mapping->host; 989dfd11184SSteven Whitehouse struct address_space *mapping = inode->i_mapping; 990b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 991b1e71b06SSteven Whitehouse struct gfs2_holder gh; 992b1e71b06SSteven Whitehouse int rv; 993b1e71b06SSteven Whitehouse 994b1e71b06SSteven Whitehouse /* 995b1e71b06SSteven Whitehouse * Deferred lock, even if its a write, since we do no allocation 996b1e71b06SSteven Whitehouse * on this path. All we need change is atime, and this lock mode 997b1e71b06SSteven Whitehouse * ensures that other nodes have flushed their buffered read caches 998b1e71b06SSteven Whitehouse * (i.e. their page cache entries for this inode). We do not, 999b1e71b06SSteven Whitehouse * unfortunately have the option of only flushing a range like 1000b1e71b06SSteven Whitehouse * the VFS does. 1001b1e71b06SSteven Whitehouse */ 1002b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); 1003b1e71b06SSteven Whitehouse rv = gfs2_glock_nq(&gh); 1004b1e71b06SSteven Whitehouse if (rv) 1005b1e71b06SSteven Whitehouse return rv; 1006b1e71b06SSteven Whitehouse rv = gfs2_ok_for_dio(ip, rw, offset); 1007b1e71b06SSteven Whitehouse if (rv != 1) 1008b1e71b06SSteven Whitehouse goto out; /* dio not valid, fall back to buffered i/o */ 1009b1e71b06SSteven Whitehouse 1010dfd11184SSteven Whitehouse /* 1011dfd11184SSteven Whitehouse * Now since we are holding a deferred (CW) lock at this point, you 1012dfd11184SSteven Whitehouse * might be wondering why this is ever needed. There is a case however 1013dfd11184SSteven Whitehouse * where we've granted a deferred local lock against a cached exclusive 1014dfd11184SSteven Whitehouse * glock. That is ok provided all granted local locks are deferred, but 1015dfd11184SSteven Whitehouse * it also means that it is possible to encounter pages which are 1016dfd11184SSteven Whitehouse * cached and possibly also mapped. So here we check for that and sort 1017dfd11184SSteven Whitehouse * them out ahead of the dio. The glock state machine will take care of 1018dfd11184SSteven Whitehouse * everything else. 1019dfd11184SSteven Whitehouse * 1020dfd11184SSteven Whitehouse * If in fact the cached glock state (gl->gl_state) is deferred (CW) in 1021dfd11184SSteven Whitehouse * the first place, mapping->nr_pages will always be zero. 1022dfd11184SSteven Whitehouse */ 1023dfd11184SSteven Whitehouse if (mapping->nrpages) { 1024dfd11184SSteven Whitehouse loff_t lstart = offset & (PAGE_CACHE_SIZE - 1); 1025dfd11184SSteven Whitehouse loff_t len = iov_length(iov, nr_segs); 1026dfd11184SSteven Whitehouse loff_t end = PAGE_ALIGN(offset + len) - 1; 1027dfd11184SSteven Whitehouse 1028dfd11184SSteven Whitehouse rv = 0; 1029dfd11184SSteven Whitehouse if (len == 0) 1030dfd11184SSteven Whitehouse goto out; 1031dfd11184SSteven Whitehouse if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags)) 1032dfd11184SSteven Whitehouse unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len); 1033dfd11184SSteven Whitehouse rv = filemap_write_and_wait_range(mapping, lstart, end); 1034dfd11184SSteven Whitehouse if (rv) 1035086352f1SSteven Whitehouse goto out; 1036086352f1SSteven Whitehouse if (rw == WRITE) 1037dfd11184SSteven Whitehouse truncate_inode_pages_range(mapping, lstart, end); 1038dfd11184SSteven Whitehouse } 1039dfd11184SSteven Whitehouse 1040eafdc7d1SChristoph Hellwig rv = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 1041eafdc7d1SChristoph Hellwig offset, nr_segs, gfs2_get_block_direct, 1042eafdc7d1SChristoph Hellwig NULL, NULL, 0); 1043b1e71b06SSteven Whitehouse out: 10448e711e10SBob Peterson gfs2_glock_dq(&gh); 1045b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 1046b1e71b06SSteven Whitehouse return rv; 1047b1e71b06SSteven Whitehouse } 1048b1e71b06SSteven Whitehouse 1049b1e71b06SSteven Whitehouse /** 1050b1e71b06SSteven Whitehouse * gfs2_releasepage - free the metadata associated with a page 1051b1e71b06SSteven Whitehouse * @page: the page that's being released 1052b1e71b06SSteven Whitehouse * @gfp_mask: passed from Linux VFS, ignored by us 1053b1e71b06SSteven Whitehouse * 1054b1e71b06SSteven Whitehouse * Call try_to_free_buffers() if the buffers in this page can be 1055b1e71b06SSteven Whitehouse * released. 1056b1e71b06SSteven Whitehouse * 1057b1e71b06SSteven Whitehouse * Returns: 0 1058b1e71b06SSteven Whitehouse */ 1059b1e71b06SSteven Whitehouse 1060b1e71b06SSteven Whitehouse int gfs2_releasepage(struct page *page, gfp_t gfp_mask) 1061b1e71b06SSteven Whitehouse { 1062009d8518SSteven Whitehouse struct address_space *mapping = page->mapping; 1063009d8518SSteven Whitehouse struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 1064b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 1065b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 1066b1e71b06SSteven Whitehouse 1067b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 1068b1e71b06SSteven Whitehouse return 0; 1069b1e71b06SSteven Whitehouse 1070b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 1071380f7c65SSteven Whitehouse spin_lock(&sdp->sd_ail_lock); 1072b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1073b1e71b06SSteven Whitehouse do { 1074b1e71b06SSteven Whitehouse if (atomic_read(&bh->b_count)) 1075b1e71b06SSteven Whitehouse goto cannot_release; 1076b1e71b06SSteven Whitehouse bd = bh->b_private; 107716ca9412SBenjamin Marzinski if (bd && bd->bd_tr) 1078b1e71b06SSteven Whitehouse goto cannot_release; 10798f065d36SSteven Whitehouse if (buffer_pinned(bh) || buffer_dirty(bh)) 10808f065d36SSteven Whitehouse goto not_possible; 1081b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1082b1e71b06SSteven Whitehouse } while(bh != head); 1083380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 1084b1e71b06SSteven Whitehouse 1085b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1086b1e71b06SSteven Whitehouse do { 1087b1e71b06SSteven Whitehouse bd = bh->b_private; 1088b1e71b06SSteven Whitehouse if (bd) { 1089b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, bd->bd_bh == bh); 1090e4f29206SSteven Whitehouse if (!list_empty(&bd->bd_list)) 1091c0752aa7SBob Peterson list_del_init(&bd->bd_list); 1092b1e71b06SSteven Whitehouse bd->bd_bh = NULL; 1093b1e71b06SSteven Whitehouse bh->b_private = NULL; 1094b1e71b06SSteven Whitehouse kmem_cache_free(gfs2_bufdata_cachep, bd); 1095e4f29206SSteven Whitehouse } 1096b1e71b06SSteven Whitehouse 1097b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1098b1e71b06SSteven Whitehouse } while (bh != head); 1099e4f29206SSteven Whitehouse gfs2_log_unlock(sdp); 1100b1e71b06SSteven Whitehouse 1101b1e71b06SSteven Whitehouse return try_to_free_buffers(page); 11028f065d36SSteven Whitehouse 11038f065d36SSteven Whitehouse not_possible: /* Should never happen */ 11048f065d36SSteven Whitehouse WARN_ON(buffer_dirty(bh)); 11058f065d36SSteven Whitehouse WARN_ON(buffer_pinned(bh)); 1106b1e71b06SSteven Whitehouse cannot_release: 1107380f7c65SSteven Whitehouse spin_unlock(&sdp->sd_ail_lock); 1108b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1109b1e71b06SSteven Whitehouse return 0; 1110b1e71b06SSteven Whitehouse } 1111b1e71b06SSteven Whitehouse 1112b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_writeback_aops = { 11139d358143SSteven Whitehouse .writepage = gfs2_writepage, 111445138990SSteven Whitehouse .writepages = gfs2_writepages, 1115b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1116b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1117b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1118b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1119b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1120b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1121b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1122b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1123b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1124b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1125aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1126b1e71b06SSteven Whitehouse }; 1127b1e71b06SSteven Whitehouse 1128b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_ordered_aops = { 11299d358143SSteven Whitehouse .writepage = gfs2_writepage, 113045138990SSteven Whitehouse .writepages = gfs2_writepages, 1131b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1132b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1133b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1134b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1135b1e71b06SSteven Whitehouse .set_page_dirty = gfs2_set_page_dirty, 1136b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1137b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1138b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1139b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1140b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1141b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1142aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1143b1e71b06SSteven Whitehouse }; 1144b1e71b06SSteven Whitehouse 1145b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_jdata_aops = { 1146b1e71b06SSteven Whitehouse .writepage = gfs2_jdata_writepage, 1147b1e71b06SSteven Whitehouse .writepages = gfs2_jdata_writepages, 1148b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1149b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1150b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1151b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1152b1e71b06SSteven Whitehouse .set_page_dirty = gfs2_set_page_dirty, 1153b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1154b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1155b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1156b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1157aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1158b1e71b06SSteven Whitehouse }; 1159b1e71b06SSteven Whitehouse 1160b1e71b06SSteven Whitehouse void gfs2_set_aops(struct inode *inode) 1161b1e71b06SSteven Whitehouse { 1162b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1163b1e71b06SSteven Whitehouse 1164b1e71b06SSteven Whitehouse if (gfs2_is_writeback(ip)) 1165b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_writeback_aops; 1166b1e71b06SSteven Whitehouse else if (gfs2_is_ordered(ip)) 1167b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_ordered_aops; 1168b1e71b06SSteven Whitehouse else if (gfs2_is_jdata(ip)) 1169b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_jdata_aops; 1170b1e71b06SSteven Whitehouse else 1171b1e71b06SSteven Whitehouse BUG(); 1172b1e71b06SSteven Whitehouse } 1173b1e71b06SSteven Whitehouse 1174