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 39b1e71b06SSteven Whitehouse 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); 54b1e71b06SSteven Whitehouse gfs2_trans_add_bh(ip->i_gl, bh, 0); 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 /** 233b1e71b06SSteven Whitehouse * gfs2_writeback_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 * 237b1e71b06SSteven Whitehouse * For the data=writeback case we can already ignore buffer heads 238b1e71b06SSteven Whitehouse * and write whole extents at once. This is a big reduction in the 239b1e71b06SSteven Whitehouse * number of I/O requests we send and the bmap calls we make in this case. 240b1e71b06SSteven Whitehouse */ 241b1e71b06SSteven Whitehouse static int gfs2_writeback_writepages(struct address_space *mapping, 242b1e71b06SSteven Whitehouse struct writeback_control *wbc) 243b1e71b06SSteven Whitehouse { 244b1e71b06SSteven Whitehouse return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); 245b1e71b06SSteven Whitehouse } 246b1e71b06SSteven Whitehouse 247b1e71b06SSteven Whitehouse /** 248b1e71b06SSteven Whitehouse * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages 249b1e71b06SSteven Whitehouse * @mapping: The mapping 250b1e71b06SSteven Whitehouse * @wbc: The writeback control 251b1e71b06SSteven Whitehouse * @writepage: The writepage function to call for each page 252b1e71b06SSteven Whitehouse * @pvec: The vector of pages 253b1e71b06SSteven Whitehouse * @nr_pages: The number of pages to write 254b1e71b06SSteven Whitehouse * 255b1e71b06SSteven Whitehouse * Returns: non-zero if loop should terminate, zero otherwise 256b1e71b06SSteven Whitehouse */ 257b1e71b06SSteven Whitehouse 258b1e71b06SSteven Whitehouse static int gfs2_write_jdata_pagevec(struct address_space *mapping, 259b1e71b06SSteven Whitehouse struct writeback_control *wbc, 260b1e71b06SSteven Whitehouse struct pagevec *pvec, 261b1e71b06SSteven Whitehouse int nr_pages, pgoff_t end) 262b1e71b06SSteven Whitehouse { 263b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 264b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 265b1e71b06SSteven Whitehouse loff_t i_size = i_size_read(inode); 266b1e71b06SSteven Whitehouse pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; 267b1e71b06SSteven Whitehouse unsigned offset = i_size & (PAGE_CACHE_SIZE-1); 268b1e71b06SSteven Whitehouse unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize); 269b1e71b06SSteven Whitehouse int i; 270b1e71b06SSteven Whitehouse int ret; 271b1e71b06SSteven Whitehouse 272b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); 273b1e71b06SSteven Whitehouse if (ret < 0) 274b1e71b06SSteven Whitehouse return ret; 275b1e71b06SSteven Whitehouse 276b1e71b06SSteven Whitehouse for(i = 0; i < nr_pages; i++) { 277b1e71b06SSteven Whitehouse struct page *page = pvec->pages[i]; 278b1e71b06SSteven Whitehouse 279b1e71b06SSteven Whitehouse lock_page(page); 280b1e71b06SSteven Whitehouse 281b1e71b06SSteven Whitehouse if (unlikely(page->mapping != mapping)) { 282b1e71b06SSteven Whitehouse unlock_page(page); 283b1e71b06SSteven Whitehouse continue; 284b1e71b06SSteven Whitehouse } 285b1e71b06SSteven Whitehouse 286b1e71b06SSteven Whitehouse if (!wbc->range_cyclic && page->index > end) { 287b1e71b06SSteven Whitehouse ret = 1; 288b1e71b06SSteven Whitehouse unlock_page(page); 289b1e71b06SSteven Whitehouse continue; 290b1e71b06SSteven Whitehouse } 291b1e71b06SSteven Whitehouse 292b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_NONE) 293b1e71b06SSteven Whitehouse wait_on_page_writeback(page); 294b1e71b06SSteven Whitehouse 295b1e71b06SSteven Whitehouse if (PageWriteback(page) || 296b1e71b06SSteven Whitehouse !clear_page_dirty_for_io(page)) { 297b1e71b06SSteven Whitehouse unlock_page(page); 298b1e71b06SSteven Whitehouse continue; 299b1e71b06SSteven Whitehouse } 300b1e71b06SSteven Whitehouse 301b1e71b06SSteven Whitehouse /* Is the page fully outside i_size? (truncate in progress) */ 302b1e71b06SSteven Whitehouse if (page->index > end_index || (page->index == end_index && !offset)) { 303b1e71b06SSteven Whitehouse page->mapping->a_ops->invalidatepage(page, 0); 304b1e71b06SSteven Whitehouse unlock_page(page); 305b1e71b06SSteven Whitehouse continue; 306b1e71b06SSteven Whitehouse } 307b1e71b06SSteven Whitehouse 308b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 309b1e71b06SSteven Whitehouse 310b1e71b06SSteven Whitehouse if (ret || (--(wbc->nr_to_write) <= 0)) 311b1e71b06SSteven Whitehouse ret = 1; 312b1e71b06SSteven Whitehouse } 313b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 314b1e71b06SSteven Whitehouse return ret; 315b1e71b06SSteven Whitehouse } 316b1e71b06SSteven Whitehouse 317b1e71b06SSteven Whitehouse /** 318b1e71b06SSteven Whitehouse * gfs2_write_cache_jdata - Like write_cache_pages but different 319b1e71b06SSteven Whitehouse * @mapping: The mapping to write 320b1e71b06SSteven Whitehouse * @wbc: The writeback control 321b1e71b06SSteven Whitehouse * @writepage: The writepage function to call 322b1e71b06SSteven Whitehouse * @data: The data to pass to writepage 323b1e71b06SSteven Whitehouse * 324b1e71b06SSteven Whitehouse * The reason that we use our own function here is that we need to 325b1e71b06SSteven Whitehouse * start transactions before we grab page locks. This allows us 326b1e71b06SSteven Whitehouse * to get the ordering right. 327b1e71b06SSteven Whitehouse */ 328b1e71b06SSteven Whitehouse 329b1e71b06SSteven Whitehouse static int gfs2_write_cache_jdata(struct address_space *mapping, 330b1e71b06SSteven Whitehouse struct writeback_control *wbc) 331b1e71b06SSteven Whitehouse { 332b1e71b06SSteven Whitehouse int ret = 0; 333b1e71b06SSteven Whitehouse int done = 0; 334b1e71b06SSteven Whitehouse struct pagevec pvec; 335b1e71b06SSteven Whitehouse int nr_pages; 336b1e71b06SSteven Whitehouse pgoff_t index; 337b1e71b06SSteven Whitehouse pgoff_t end; 338b1e71b06SSteven Whitehouse int scanned = 0; 339b1e71b06SSteven Whitehouse int range_whole = 0; 340b1e71b06SSteven Whitehouse 341b1e71b06SSteven Whitehouse pagevec_init(&pvec, 0); 342b1e71b06SSteven Whitehouse if (wbc->range_cyclic) { 343b1e71b06SSteven Whitehouse index = mapping->writeback_index; /* Start from prev offset */ 344b1e71b06SSteven Whitehouse end = -1; 345b1e71b06SSteven Whitehouse } else { 346b1e71b06SSteven Whitehouse index = wbc->range_start >> PAGE_CACHE_SHIFT; 347b1e71b06SSteven Whitehouse end = wbc->range_end >> PAGE_CACHE_SHIFT; 348b1e71b06SSteven Whitehouse if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 349b1e71b06SSteven Whitehouse range_whole = 1; 350b1e71b06SSteven Whitehouse scanned = 1; 351b1e71b06SSteven Whitehouse } 352b1e71b06SSteven Whitehouse 353b1e71b06SSteven Whitehouse retry: 354b1e71b06SSteven Whitehouse while (!done && (index <= end) && 355b1e71b06SSteven Whitehouse (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, 356b1e71b06SSteven Whitehouse PAGECACHE_TAG_DIRTY, 357b1e71b06SSteven Whitehouse min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { 358b1e71b06SSteven Whitehouse scanned = 1; 359b1e71b06SSteven Whitehouse ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end); 360b1e71b06SSteven Whitehouse if (ret) 361b1e71b06SSteven Whitehouse done = 1; 362b1e71b06SSteven Whitehouse if (ret > 0) 363b1e71b06SSteven Whitehouse ret = 0; 364b1e71b06SSteven Whitehouse 365b1e71b06SSteven Whitehouse pagevec_release(&pvec); 366b1e71b06SSteven Whitehouse cond_resched(); 367b1e71b06SSteven Whitehouse } 368b1e71b06SSteven Whitehouse 369b1e71b06SSteven Whitehouse if (!scanned && !done) { 370b1e71b06SSteven Whitehouse /* 371b1e71b06SSteven Whitehouse * We hit the last page and there is more work to be done: wrap 372b1e71b06SSteven Whitehouse * back to the start of the file 373b1e71b06SSteven Whitehouse */ 374b1e71b06SSteven Whitehouse scanned = 1; 375b1e71b06SSteven Whitehouse index = 0; 376b1e71b06SSteven Whitehouse goto retry; 377b1e71b06SSteven Whitehouse } 378b1e71b06SSteven Whitehouse 379b1e71b06SSteven Whitehouse if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 380b1e71b06SSteven Whitehouse mapping->writeback_index = index; 381b1e71b06SSteven Whitehouse return ret; 382b1e71b06SSteven Whitehouse } 383b1e71b06SSteven Whitehouse 384b1e71b06SSteven Whitehouse 385b1e71b06SSteven Whitehouse /** 386b1e71b06SSteven Whitehouse * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk 387b1e71b06SSteven Whitehouse * @mapping: The mapping to write 388b1e71b06SSteven Whitehouse * @wbc: The writeback control 389b1e71b06SSteven Whitehouse * 390b1e71b06SSteven Whitehouse */ 391b1e71b06SSteven Whitehouse 392b1e71b06SSteven Whitehouse static int gfs2_jdata_writepages(struct address_space *mapping, 393b1e71b06SSteven Whitehouse struct writeback_control *wbc) 394b1e71b06SSteven Whitehouse { 395b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 396b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 397b1e71b06SSteven Whitehouse int ret; 398b1e71b06SSteven Whitehouse 399b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 400b1e71b06SSteven Whitehouse if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { 401b1e71b06SSteven Whitehouse gfs2_log_flush(sdp, ip->i_gl); 402b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 403b1e71b06SSteven Whitehouse } 404b1e71b06SSteven Whitehouse return ret; 405b1e71b06SSteven Whitehouse } 406b1e71b06SSteven Whitehouse 407b1e71b06SSteven Whitehouse /** 408b1e71b06SSteven Whitehouse * stuffed_readpage - Fill in a Linux page with stuffed file data 409b1e71b06SSteven Whitehouse * @ip: the inode 410b1e71b06SSteven Whitehouse * @page: the page 411b1e71b06SSteven Whitehouse * 412b1e71b06SSteven Whitehouse * Returns: errno 413b1e71b06SSteven Whitehouse */ 414b1e71b06SSteven Whitehouse 415b1e71b06SSteven Whitehouse static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) 416b1e71b06SSteven Whitehouse { 417b1e71b06SSteven Whitehouse struct buffer_head *dibh; 418602c89d2SSteven Whitehouse u64 dsize = i_size_read(&ip->i_inode); 419b1e71b06SSteven Whitehouse void *kaddr; 420b1e71b06SSteven Whitehouse int error; 421b1e71b06SSteven Whitehouse 422b1e71b06SSteven Whitehouse /* 423b1e71b06SSteven Whitehouse * Due to the order of unstuffing files and ->fault(), we can be 424b1e71b06SSteven Whitehouse * asked for a zero page in the case of a stuffed file being extended, 425b1e71b06SSteven Whitehouse * so we need to supply one here. It doesn't happen often. 426b1e71b06SSteven Whitehouse */ 427b1e71b06SSteven Whitehouse if (unlikely(page->index)) { 428b1e71b06SSteven Whitehouse zero_user(page, 0, PAGE_CACHE_SIZE); 429b1e71b06SSteven Whitehouse SetPageUptodate(page); 430b1e71b06SSteven Whitehouse return 0; 431b1e71b06SSteven Whitehouse } 432b1e71b06SSteven Whitehouse 433b1e71b06SSteven Whitehouse error = gfs2_meta_inode_buffer(ip, &dibh); 434b1e71b06SSteven Whitehouse if (error) 435b1e71b06SSteven Whitehouse return error; 436b1e71b06SSteven Whitehouse 437b1e71b06SSteven Whitehouse kaddr = kmap_atomic(page, KM_USER0); 438602c89d2SSteven Whitehouse if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode))) 439602c89d2SSteven Whitehouse dsize = (dibh->b_size - sizeof(struct gfs2_dinode)); 440602c89d2SSteven Whitehouse memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); 441602c89d2SSteven Whitehouse memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize); 442b1e71b06SSteven Whitehouse kunmap_atomic(kaddr, KM_USER0); 443b1e71b06SSteven Whitehouse flush_dcache_page(page); 444b1e71b06SSteven Whitehouse brelse(dibh); 445b1e71b06SSteven Whitehouse SetPageUptodate(page); 446b1e71b06SSteven Whitehouse 447b1e71b06SSteven Whitehouse return 0; 448b1e71b06SSteven Whitehouse } 449b1e71b06SSteven Whitehouse 450b1e71b06SSteven Whitehouse 451b1e71b06SSteven Whitehouse /** 452b1e71b06SSteven Whitehouse * __gfs2_readpage - readpage 453b1e71b06SSteven Whitehouse * @file: The file to read a page for 454b1e71b06SSteven Whitehouse * @page: The page to read 455b1e71b06SSteven Whitehouse * 456b1e71b06SSteven Whitehouse * This is the core of gfs2's readpage. Its used by the internal file 457b1e71b06SSteven Whitehouse * reading code as in that case we already hold the glock. Also its 458b1e71b06SSteven Whitehouse * called by gfs2_readpage() once the required lock has been granted. 459b1e71b06SSteven Whitehouse * 460b1e71b06SSteven Whitehouse */ 461b1e71b06SSteven Whitehouse 462b1e71b06SSteven Whitehouse static int __gfs2_readpage(void *file, struct page *page) 463b1e71b06SSteven Whitehouse { 464b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(page->mapping->host); 465b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 466b1e71b06SSteven Whitehouse int error; 467b1e71b06SSteven Whitehouse 468b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 469b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 470b1e71b06SSteven Whitehouse unlock_page(page); 471b1e71b06SSteven Whitehouse } else { 472b1e71b06SSteven Whitehouse error = mpage_readpage(page, gfs2_block_map); 473b1e71b06SSteven Whitehouse } 474b1e71b06SSteven Whitehouse 475b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 476b1e71b06SSteven Whitehouse return -EIO; 477b1e71b06SSteven Whitehouse 478b1e71b06SSteven Whitehouse return error; 479b1e71b06SSteven Whitehouse } 480b1e71b06SSteven Whitehouse 481b1e71b06SSteven Whitehouse /** 482b1e71b06SSteven Whitehouse * gfs2_readpage - read a page of a file 483b1e71b06SSteven Whitehouse * @file: The file to read 484b1e71b06SSteven Whitehouse * @page: The page of the file 485b1e71b06SSteven Whitehouse * 486b1e71b06SSteven Whitehouse * This deals with the locking required. We have to unlock and 487b1e71b06SSteven Whitehouse * relock the page in order to get the locking in the right 488b1e71b06SSteven Whitehouse * order. 489b1e71b06SSteven Whitehouse */ 490b1e71b06SSteven Whitehouse 491b1e71b06SSteven Whitehouse static int gfs2_readpage(struct file *file, struct page *page) 492b1e71b06SSteven Whitehouse { 493b1e71b06SSteven Whitehouse struct address_space *mapping = page->mapping; 494b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 495b1e71b06SSteven Whitehouse struct gfs2_holder gh; 496b1e71b06SSteven Whitehouse int error; 497b1e71b06SSteven Whitehouse 498b1e71b06SSteven Whitehouse unlock_page(page); 499b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 500b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&gh); 501b1e71b06SSteven Whitehouse if (unlikely(error)) 502b1e71b06SSteven Whitehouse goto out; 503b1e71b06SSteven Whitehouse error = AOP_TRUNCATED_PAGE; 504b1e71b06SSteven Whitehouse lock_page(page); 505b1e71b06SSteven Whitehouse if (page->mapping == mapping && !PageUptodate(page)) 506b1e71b06SSteven Whitehouse error = __gfs2_readpage(file, page); 507b1e71b06SSteven Whitehouse else 508b1e71b06SSteven Whitehouse unlock_page(page); 509b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 510b1e71b06SSteven Whitehouse out: 511b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 512b1e71b06SSteven Whitehouse if (error && error != AOP_TRUNCATED_PAGE) 513b1e71b06SSteven Whitehouse lock_page(page); 514b1e71b06SSteven Whitehouse return error; 515b1e71b06SSteven Whitehouse } 516b1e71b06SSteven Whitehouse 517b1e71b06SSteven Whitehouse /** 518b1e71b06SSteven Whitehouse * gfs2_internal_read - read an internal file 519b1e71b06SSteven Whitehouse * @ip: The gfs2 inode 520b1e71b06SSteven Whitehouse * @ra_state: The readahead state (or NULL for no readahead) 521b1e71b06SSteven Whitehouse * @buf: The buffer to fill 522b1e71b06SSteven Whitehouse * @pos: The file position 523b1e71b06SSteven Whitehouse * @size: The amount to read 524b1e71b06SSteven Whitehouse * 525b1e71b06SSteven Whitehouse */ 526b1e71b06SSteven Whitehouse 527b1e71b06SSteven Whitehouse int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, 528b1e71b06SSteven Whitehouse char *buf, loff_t *pos, unsigned size) 529b1e71b06SSteven Whitehouse { 530b1e71b06SSteven Whitehouse struct address_space *mapping = ip->i_inode.i_mapping; 531b1e71b06SSteven Whitehouse unsigned long index = *pos / PAGE_CACHE_SIZE; 532b1e71b06SSteven Whitehouse unsigned offset = *pos & (PAGE_CACHE_SIZE - 1); 533b1e71b06SSteven Whitehouse unsigned copied = 0; 534b1e71b06SSteven Whitehouse unsigned amt; 535b1e71b06SSteven Whitehouse struct page *page; 536b1e71b06SSteven Whitehouse void *p; 537b1e71b06SSteven Whitehouse 538b1e71b06SSteven Whitehouse do { 539b1e71b06SSteven Whitehouse amt = size - copied; 540b1e71b06SSteven Whitehouse if (offset + size > PAGE_CACHE_SIZE) 541b1e71b06SSteven Whitehouse amt = PAGE_CACHE_SIZE - offset; 542b1e71b06SSteven Whitehouse page = read_cache_page(mapping, index, __gfs2_readpage, NULL); 543b1e71b06SSteven Whitehouse if (IS_ERR(page)) 544b1e71b06SSteven Whitehouse return PTR_ERR(page); 545b1e71b06SSteven Whitehouse p = kmap_atomic(page, KM_USER0); 546b1e71b06SSteven Whitehouse memcpy(buf + copied, p + offset, amt); 547b1e71b06SSteven Whitehouse kunmap_atomic(p, KM_USER0); 548b1e71b06SSteven Whitehouse mark_page_accessed(page); 549b1e71b06SSteven Whitehouse page_cache_release(page); 550b1e71b06SSteven Whitehouse copied += amt; 551b1e71b06SSteven Whitehouse index++; 552b1e71b06SSteven Whitehouse offset = 0; 553b1e71b06SSteven Whitehouse } while(copied < size); 554b1e71b06SSteven Whitehouse (*pos) += size; 555b1e71b06SSteven Whitehouse return size; 556b1e71b06SSteven Whitehouse } 557b1e71b06SSteven Whitehouse 558b1e71b06SSteven Whitehouse /** 559b1e71b06SSteven Whitehouse * gfs2_readpages - Read a bunch of pages at once 560b1e71b06SSteven Whitehouse * 561b1e71b06SSteven Whitehouse * Some notes: 562b1e71b06SSteven Whitehouse * 1. This is only for readahead, so we can simply ignore any things 563b1e71b06SSteven Whitehouse * which are slightly inconvenient (such as locking conflicts between 564b1e71b06SSteven Whitehouse * the page lock and the glock) and return having done no I/O. Its 565b1e71b06SSteven Whitehouse * obviously not something we'd want to do on too regular a basis. 566b1e71b06SSteven Whitehouse * Any I/O we ignore at this time will be done via readpage later. 567b1e71b06SSteven Whitehouse * 2. We don't handle stuffed files here we let readpage do the honours. 568b1e71b06SSteven Whitehouse * 3. mpage_readpages() does most of the heavy lifting in the common case. 569b1e71b06SSteven Whitehouse * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. 570b1e71b06SSteven Whitehouse */ 571b1e71b06SSteven Whitehouse 572b1e71b06SSteven Whitehouse static int gfs2_readpages(struct file *file, struct address_space *mapping, 573b1e71b06SSteven Whitehouse struct list_head *pages, unsigned nr_pages) 574b1e71b06SSteven Whitehouse { 575b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 576b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 577b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 578b1e71b06SSteven Whitehouse struct gfs2_holder gh; 579b1e71b06SSteven Whitehouse int ret; 580b1e71b06SSteven Whitehouse 581b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 582b1e71b06SSteven Whitehouse ret = gfs2_glock_nq(&gh); 583b1e71b06SSteven Whitehouse if (unlikely(ret)) 584b1e71b06SSteven Whitehouse goto out_uninit; 585b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 586b1e71b06SSteven Whitehouse ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); 587b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 588b1e71b06SSteven Whitehouse out_uninit: 589b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 590b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 591b1e71b06SSteven Whitehouse ret = -EIO; 592b1e71b06SSteven Whitehouse return ret; 593b1e71b06SSteven Whitehouse } 594b1e71b06SSteven Whitehouse 595b1e71b06SSteven Whitehouse /** 596b1e71b06SSteven Whitehouse * gfs2_write_begin - Begin to write to a file 597b1e71b06SSteven Whitehouse * @file: The file to write to 598b1e71b06SSteven Whitehouse * @mapping: The mapping in which to write 599b1e71b06SSteven Whitehouse * @pos: The file offset at which to start writing 600b1e71b06SSteven Whitehouse * @len: Length of the write 601b1e71b06SSteven Whitehouse * @flags: Various flags 602b1e71b06SSteven Whitehouse * @pagep: Pointer to return the page 603b1e71b06SSteven Whitehouse * @fsdata: Pointer to return fs data (unused by GFS2) 604b1e71b06SSteven Whitehouse * 605b1e71b06SSteven Whitehouse * Returns: errno 606b1e71b06SSteven Whitehouse */ 607b1e71b06SSteven Whitehouse 608b1e71b06SSteven Whitehouse static int gfs2_write_begin(struct file *file, struct address_space *mapping, 609b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned flags, 610b1e71b06SSteven Whitehouse struct page **pagep, void **fsdata) 611b1e71b06SSteven Whitehouse { 612b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 613b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 6141946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 615b1e71b06SSteven Whitehouse unsigned int data_blocks = 0, ind_blocks = 0, rblocks; 616b1e71b06SSteven Whitehouse int alloc_required; 617b1e71b06SSteven Whitehouse int error = 0; 618b1e71b06SSteven Whitehouse struct gfs2_alloc *al; 619b1e71b06SSteven Whitehouse pgoff_t index = pos >> PAGE_CACHE_SHIFT; 620b1e71b06SSteven Whitehouse unsigned from = pos & (PAGE_CACHE_SIZE - 1); 621b1e71b06SSteven Whitehouse unsigned to = from + len; 622b1e71b06SSteven Whitehouse struct page *page; 623b1e71b06SSteven Whitehouse 624b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); 625b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&ip->i_gh); 626b1e71b06SSteven Whitehouse if (unlikely(error)) 627b1e71b06SSteven Whitehouse goto out_uninit; 6281946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 6291946f70aSBenjamin Marzinski error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 6301946f70aSBenjamin Marzinski GL_NOCACHE, &m_ip->i_gh); 6311946f70aSBenjamin Marzinski if (unlikely(error)) { 6321946f70aSBenjamin Marzinski gfs2_glock_dq(&ip->i_gh); 6331946f70aSBenjamin Marzinski goto out_uninit; 6341946f70aSBenjamin Marzinski } 6351946f70aSBenjamin Marzinski } 636b1e71b06SSteven Whitehouse 637461cb419SBob Peterson alloc_required = gfs2_write_alloc_required(ip, pos, len); 638b1e71b06SSteven Whitehouse 639b1e71b06SSteven Whitehouse if (alloc_required || gfs2_is_jdata(ip)) 640b1e71b06SSteven Whitehouse gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); 641b1e71b06SSteven Whitehouse 642b1e71b06SSteven Whitehouse if (alloc_required) { 643b1e71b06SSteven Whitehouse al = gfs2_alloc_get(ip); 644b1e71b06SSteven Whitehouse if (!al) { 645b1e71b06SSteven Whitehouse error = -ENOMEM; 646b1e71b06SSteven Whitehouse goto out_unlock; 647b1e71b06SSteven Whitehouse } 648b1e71b06SSteven Whitehouse 649b1e71b06SSteven Whitehouse error = gfs2_quota_lock_check(ip); 650b1e71b06SSteven Whitehouse if (error) 651b1e71b06SSteven Whitehouse goto out_alloc_put; 652b1e71b06SSteven Whitehouse 653b1e71b06SSteven Whitehouse al->al_requested = data_blocks + ind_blocks; 654b1e71b06SSteven Whitehouse error = gfs2_inplace_reserve(ip); 655b1e71b06SSteven Whitehouse if (error) 656b1e71b06SSteven Whitehouse goto out_qunlock; 657b1e71b06SSteven Whitehouse } 658b1e71b06SSteven Whitehouse 659b1e71b06SSteven Whitehouse rblocks = RES_DINODE + ind_blocks; 660b1e71b06SSteven Whitehouse if (gfs2_is_jdata(ip)) 661b1e71b06SSteven Whitehouse rblocks += data_blocks ? data_blocks : 1; 662b1e71b06SSteven Whitehouse if (ind_blocks || data_blocks) 663b1e71b06SSteven Whitehouse rblocks += RES_STATFS + RES_QUOTA; 6641946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) 6651946f70aSBenjamin Marzinski rblocks += 2 * RES_STATFS; 666b1e71b06SSteven Whitehouse 667b1e71b06SSteven Whitehouse error = gfs2_trans_begin(sdp, rblocks, 668b1e71b06SSteven Whitehouse PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); 669b1e71b06SSteven Whitehouse if (error) 670b1e71b06SSteven Whitehouse goto out_trans_fail; 671b1e71b06SSteven Whitehouse 672b1e71b06SSteven Whitehouse error = -ENOMEM; 673b1e71b06SSteven Whitehouse flags |= AOP_FLAG_NOFS; 674b1e71b06SSteven Whitehouse page = grab_cache_page_write_begin(mapping, index, flags); 675b1e71b06SSteven Whitehouse *pagep = page; 676b1e71b06SSteven Whitehouse if (unlikely(!page)) 677b1e71b06SSteven Whitehouse goto out_endtrans; 678b1e71b06SSteven Whitehouse 679b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 680b1e71b06SSteven Whitehouse error = 0; 681b1e71b06SSteven Whitehouse if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { 682b1e71b06SSteven Whitehouse error = gfs2_unstuff_dinode(ip, page); 683b1e71b06SSteven Whitehouse if (error == 0) 684b1e71b06SSteven Whitehouse goto prepare_write; 685b1e71b06SSteven Whitehouse } else if (!PageUptodate(page)) { 686b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 687b1e71b06SSteven Whitehouse } 688b1e71b06SSteven Whitehouse goto out; 689b1e71b06SSteven Whitehouse } 690b1e71b06SSteven Whitehouse 691b1e71b06SSteven Whitehouse prepare_write: 692b1e71b06SSteven Whitehouse error = block_prepare_write(page, from, to, gfs2_block_map); 693b1e71b06SSteven Whitehouse out: 694b1e71b06SSteven Whitehouse if (error == 0) 695b1e71b06SSteven Whitehouse return 0; 696b1e71b06SSteven Whitehouse 697b1e71b06SSteven Whitehouse page_cache_release(page); 69815c6fd97Snpiggin@suse.de 699ff8f33c8SSteven Whitehouse gfs2_trans_end(sdp); 700b1e71b06SSteven Whitehouse if (pos + len > ip->i_inode.i_size) 701ff8f33c8SSteven Whitehouse gfs2_trim_blocks(&ip->i_inode); 702ff8f33c8SSteven Whitehouse goto out_trans_fail; 703ff8f33c8SSteven Whitehouse 704b1e71b06SSteven Whitehouse out_endtrans: 705b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 706b1e71b06SSteven Whitehouse out_trans_fail: 707b1e71b06SSteven Whitehouse if (alloc_required) { 708b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 709b1e71b06SSteven Whitehouse out_qunlock: 710b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 711b1e71b06SSteven Whitehouse out_alloc_put: 712b1e71b06SSteven Whitehouse gfs2_alloc_put(ip); 713b1e71b06SSteven Whitehouse } 714b1e71b06SSteven Whitehouse out_unlock: 7151946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 7161946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 7171946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 7181946f70aSBenjamin Marzinski } 719b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 720b1e71b06SSteven Whitehouse out_uninit: 721b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 722b1e71b06SSteven Whitehouse return error; 723b1e71b06SSteven Whitehouse } 724b1e71b06SSteven Whitehouse 725b1e71b06SSteven Whitehouse /** 726b1e71b06SSteven Whitehouse * adjust_fs_space - Adjusts the free space available due to gfs2_grow 727b1e71b06SSteven Whitehouse * @inode: the rindex inode 728b1e71b06SSteven Whitehouse */ 729b1e71b06SSteven Whitehouse static void adjust_fs_space(struct inode *inode) 730b1e71b06SSteven Whitehouse { 731b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; 7321946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 7331946f70aSBenjamin Marzinski struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 734b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 735b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 7361946f70aSBenjamin Marzinski struct buffer_head *m_bh, *l_bh; 737b1e71b06SSteven Whitehouse u64 fs_total, new_free; 738b1e71b06SSteven Whitehouse 739b1e71b06SSteven Whitehouse /* Total up the file system space, according to the latest rindex. */ 740b1e71b06SSteven Whitehouse fs_total = gfs2_ri_total(sdp); 7411946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) 7421946f70aSBenjamin Marzinski return; 743b1e71b06SSteven Whitehouse 744b1e71b06SSteven Whitehouse spin_lock(&sdp->sd_statfs_spin); 7451946f70aSBenjamin Marzinski gfs2_statfs_change_in(m_sc, m_bh->b_data + 7461946f70aSBenjamin Marzinski sizeof(struct gfs2_dinode)); 747b1e71b06SSteven Whitehouse if (fs_total > (m_sc->sc_total + l_sc->sc_total)) 748b1e71b06SSteven Whitehouse new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); 749b1e71b06SSteven Whitehouse else 750b1e71b06SSteven Whitehouse new_free = 0; 751b1e71b06SSteven Whitehouse spin_unlock(&sdp->sd_statfs_spin); 752b1e71b06SSteven Whitehouse fs_warn(sdp, "File system extended by %llu blocks.\n", 753b1e71b06SSteven Whitehouse (unsigned long long)new_free); 754b1e71b06SSteven Whitehouse gfs2_statfs_change(sdp, new_free, new_free, 0); 7551946f70aSBenjamin Marzinski 7561946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) 7571946f70aSBenjamin Marzinski goto out; 7581946f70aSBenjamin Marzinski update_statfs(sdp, m_bh, l_bh); 7591946f70aSBenjamin Marzinski brelse(l_bh); 7601946f70aSBenjamin Marzinski out: 7611946f70aSBenjamin Marzinski brelse(m_bh); 762b1e71b06SSteven Whitehouse } 763b1e71b06SSteven Whitehouse 764b1e71b06SSteven Whitehouse /** 765b1e71b06SSteven Whitehouse * gfs2_stuffed_write_end - Write end for stuffed files 766b1e71b06SSteven Whitehouse * @inode: The inode 767b1e71b06SSteven Whitehouse * @dibh: The buffer_head containing the on-disk inode 768b1e71b06SSteven Whitehouse * @pos: The file position 769b1e71b06SSteven Whitehouse * @len: The length of the write 770b1e71b06SSteven Whitehouse * @copied: How much was actually copied by the VFS 771b1e71b06SSteven Whitehouse * @page: The page 772b1e71b06SSteven Whitehouse * 773b1e71b06SSteven Whitehouse * This copies the data from the page into the inode block after 774b1e71b06SSteven Whitehouse * the inode data structure itself. 775b1e71b06SSteven Whitehouse * 776b1e71b06SSteven Whitehouse * Returns: errno 777b1e71b06SSteven Whitehouse */ 778b1e71b06SSteven Whitehouse static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, 779b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 780b1e71b06SSteven Whitehouse struct page *page) 781b1e71b06SSteven Whitehouse { 782b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 783b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 7841946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 785b1e71b06SSteven Whitehouse u64 to = pos + copied; 786b1e71b06SSteven Whitehouse void *kaddr; 787b1e71b06SSteven Whitehouse unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); 788b1e71b06SSteven Whitehouse struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 789b1e71b06SSteven Whitehouse 790b1e71b06SSteven Whitehouse BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode))); 791b1e71b06SSteven Whitehouse kaddr = kmap_atomic(page, KM_USER0); 792b1e71b06SSteven Whitehouse memcpy(buf + pos, kaddr + pos, copied); 793b1e71b06SSteven Whitehouse memset(kaddr + pos + copied, 0, len - copied); 794b1e71b06SSteven Whitehouse flush_dcache_page(page); 795b1e71b06SSteven Whitehouse kunmap_atomic(kaddr, KM_USER0); 796b1e71b06SSteven Whitehouse 797b1e71b06SSteven Whitehouse if (!PageUptodate(page)) 798b1e71b06SSteven Whitehouse SetPageUptodate(page); 799b1e71b06SSteven Whitehouse unlock_page(page); 800b1e71b06SSteven Whitehouse page_cache_release(page); 801b1e71b06SSteven Whitehouse 802b1e71b06SSteven Whitehouse if (copied) { 803b1e71b06SSteven Whitehouse if (inode->i_size < to) { 804b1e71b06SSteven Whitehouse i_size_write(inode, to); 805b1e71b06SSteven Whitehouse ip->i_disksize = inode->i_size; 806b1e71b06SSteven Whitehouse } 807b1e71b06SSteven Whitehouse gfs2_dinode_out(ip, di); 808b1e71b06SSteven Whitehouse mark_inode_dirty(inode); 809b1e71b06SSteven Whitehouse } 810b1e71b06SSteven Whitehouse 8119ae3c6deSBenjamin Marzinski if (inode == sdp->sd_rindex) { 812b1e71b06SSteven Whitehouse adjust_fs_space(inode); 8139ae3c6deSBenjamin Marzinski ip->i_gh.gh_flags |= GL_NOCACHE; 8149ae3c6deSBenjamin Marzinski } 815b1e71b06SSteven Whitehouse 816b1e71b06SSteven Whitehouse brelse(dibh); 817b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 8181946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 8191946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 8201946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 8211946f70aSBenjamin Marzinski } 822b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 823b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 824b1e71b06SSteven Whitehouse return copied; 825b1e71b06SSteven Whitehouse } 826b1e71b06SSteven Whitehouse 827b1e71b06SSteven Whitehouse /** 828b1e71b06SSteven Whitehouse * gfs2_write_end 829b1e71b06SSteven Whitehouse * @file: The file to write to 830b1e71b06SSteven Whitehouse * @mapping: The address space to write to 831b1e71b06SSteven Whitehouse * @pos: The file position 832b1e71b06SSteven Whitehouse * @len: The length of the data 833b1e71b06SSteven Whitehouse * @copied: 834b1e71b06SSteven Whitehouse * @page: The page that has been written 835b1e71b06SSteven Whitehouse * @fsdata: The fsdata (unused in GFS2) 836b1e71b06SSteven Whitehouse * 837b1e71b06SSteven Whitehouse * The main write_end function for GFS2. We have a separate one for 838b1e71b06SSteven Whitehouse * stuffed files as they are slightly different, otherwise we just 839b1e71b06SSteven Whitehouse * put our locking around the VFS provided functions. 840b1e71b06SSteven Whitehouse * 841b1e71b06SSteven Whitehouse * Returns: errno 842b1e71b06SSteven Whitehouse */ 843b1e71b06SSteven Whitehouse 844b1e71b06SSteven Whitehouse static int gfs2_write_end(struct file *file, struct address_space *mapping, 845b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 846b1e71b06SSteven Whitehouse struct page *page, void *fsdata) 847b1e71b06SSteven Whitehouse { 848b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 849b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 850b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 8511946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 852b1e71b06SSteven Whitehouse struct buffer_head *dibh; 853b1e71b06SSteven Whitehouse struct gfs2_alloc *al = ip->i_alloc; 854b1e71b06SSteven Whitehouse unsigned int from = pos & (PAGE_CACHE_SIZE - 1); 855b1e71b06SSteven Whitehouse unsigned int to = from + len; 856b1e71b06SSteven Whitehouse int ret; 857b1e71b06SSteven Whitehouse 858b1e71b06SSteven Whitehouse BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); 859b1e71b06SSteven Whitehouse 860b1e71b06SSteven Whitehouse ret = gfs2_meta_inode_buffer(ip, &dibh); 861b1e71b06SSteven Whitehouse if (unlikely(ret)) { 862b1e71b06SSteven Whitehouse unlock_page(page); 863b1e71b06SSteven Whitehouse page_cache_release(page); 864b1e71b06SSteven Whitehouse goto failed; 865b1e71b06SSteven Whitehouse } 866b1e71b06SSteven Whitehouse 867b1e71b06SSteven Whitehouse gfs2_trans_add_bh(ip->i_gl, dibh, 1); 868b1e71b06SSteven Whitehouse 869b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 870b1e71b06SSteven Whitehouse return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); 871b1e71b06SSteven Whitehouse 872b1e71b06SSteven Whitehouse if (!gfs2_is_writeback(ip)) 873b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, from, to); 874b1e71b06SSteven Whitehouse 875b1e71b06SSteven Whitehouse ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); 876b1e71b06SSteven Whitehouse if (ret > 0) { 877b1e71b06SSteven Whitehouse if (inode->i_size > ip->i_disksize) 878b1e71b06SSteven Whitehouse ip->i_disksize = inode->i_size; 879b1e71b06SSteven Whitehouse gfs2_dinode_out(ip, dibh->b_data); 880b1e71b06SSteven Whitehouse mark_inode_dirty(inode); 881b1e71b06SSteven Whitehouse } 882b1e71b06SSteven Whitehouse 8839ae3c6deSBenjamin Marzinski if (inode == sdp->sd_rindex) { 884b1e71b06SSteven Whitehouse adjust_fs_space(inode); 8859ae3c6deSBenjamin Marzinski ip->i_gh.gh_flags |= GL_NOCACHE; 8869ae3c6deSBenjamin Marzinski } 887b1e71b06SSteven Whitehouse 888b1e71b06SSteven Whitehouse brelse(dibh); 889b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 890b1e71b06SSteven Whitehouse failed: 891b1e71b06SSteven Whitehouse if (al) { 892b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 893b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 894b1e71b06SSteven Whitehouse gfs2_alloc_put(ip); 895b1e71b06SSteven Whitehouse } 8961946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 8971946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 8981946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 8991946f70aSBenjamin Marzinski } 900b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 901b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 902b1e71b06SSteven Whitehouse return ret; 903b1e71b06SSteven Whitehouse } 904b1e71b06SSteven Whitehouse 905b1e71b06SSteven Whitehouse /** 906b1e71b06SSteven Whitehouse * gfs2_set_page_dirty - Page dirtying function 907b1e71b06SSteven Whitehouse * @page: The page to dirty 908b1e71b06SSteven Whitehouse * 909b1e71b06SSteven Whitehouse * Returns: 1 if it dirtyed the page, or 0 otherwise 910b1e71b06SSteven Whitehouse */ 911b1e71b06SSteven Whitehouse 912b1e71b06SSteven Whitehouse static int gfs2_set_page_dirty(struct page *page) 913b1e71b06SSteven Whitehouse { 914b1e71b06SSteven Whitehouse SetPageChecked(page); 915b1e71b06SSteven Whitehouse return __set_page_dirty_buffers(page); 916b1e71b06SSteven Whitehouse } 917b1e71b06SSteven Whitehouse 918b1e71b06SSteven Whitehouse /** 919b1e71b06SSteven Whitehouse * gfs2_bmap - Block map function 920b1e71b06SSteven Whitehouse * @mapping: Address space info 921b1e71b06SSteven Whitehouse * @lblock: The block to map 922b1e71b06SSteven Whitehouse * 923b1e71b06SSteven Whitehouse * Returns: The disk address for the block or 0 on hole or error 924b1e71b06SSteven Whitehouse */ 925b1e71b06SSteven Whitehouse 926b1e71b06SSteven Whitehouse static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) 927b1e71b06SSteven Whitehouse { 928b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 929b1e71b06SSteven Whitehouse struct gfs2_holder i_gh; 930b1e71b06SSteven Whitehouse sector_t dblock = 0; 931b1e71b06SSteven Whitehouse int error; 932b1e71b06SSteven Whitehouse 933b1e71b06SSteven Whitehouse error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 934b1e71b06SSteven Whitehouse if (error) 935b1e71b06SSteven Whitehouse return 0; 936b1e71b06SSteven Whitehouse 937b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 938b1e71b06SSteven Whitehouse dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); 939b1e71b06SSteven Whitehouse 940b1e71b06SSteven Whitehouse gfs2_glock_dq_uninit(&i_gh); 941b1e71b06SSteven Whitehouse 942b1e71b06SSteven Whitehouse return dblock; 943b1e71b06SSteven Whitehouse } 944b1e71b06SSteven Whitehouse 945b1e71b06SSteven Whitehouse static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) 946b1e71b06SSteven Whitehouse { 947b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 948b1e71b06SSteven Whitehouse 949b1e71b06SSteven Whitehouse lock_buffer(bh); 950b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 951b1e71b06SSteven Whitehouse clear_buffer_dirty(bh); 952b1e71b06SSteven Whitehouse bd = bh->b_private; 953b1e71b06SSteven Whitehouse if (bd) { 954b1e71b06SSteven Whitehouse if (!list_empty(&bd->bd_le.le_list) && !buffer_pinned(bh)) 955b1e71b06SSteven Whitehouse list_del_init(&bd->bd_le.le_list); 956b1e71b06SSteven Whitehouse else 957b1e71b06SSteven Whitehouse gfs2_remove_from_journal(bh, current->journal_info, 0); 958b1e71b06SSteven Whitehouse } 959b1e71b06SSteven Whitehouse bh->b_bdev = NULL; 960b1e71b06SSteven Whitehouse clear_buffer_mapped(bh); 961b1e71b06SSteven Whitehouse clear_buffer_req(bh); 962b1e71b06SSteven Whitehouse clear_buffer_new(bh); 963b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 964b1e71b06SSteven Whitehouse unlock_buffer(bh); 965b1e71b06SSteven Whitehouse } 966b1e71b06SSteven Whitehouse 967b1e71b06SSteven Whitehouse static void gfs2_invalidatepage(struct page *page, unsigned long offset) 968b1e71b06SSteven Whitehouse { 969b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 970b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 971b1e71b06SSteven Whitehouse unsigned long pos = 0; 972b1e71b06SSteven Whitehouse 973b1e71b06SSteven Whitehouse BUG_ON(!PageLocked(page)); 974b1e71b06SSteven Whitehouse if (offset == 0) 975b1e71b06SSteven Whitehouse ClearPageChecked(page); 976b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 977b1e71b06SSteven Whitehouse goto out; 978b1e71b06SSteven Whitehouse 979b1e71b06SSteven Whitehouse bh = head = page_buffers(page); 980b1e71b06SSteven Whitehouse do { 981b1e71b06SSteven Whitehouse if (offset <= pos) 982b1e71b06SSteven Whitehouse gfs2_discard(sdp, bh); 983b1e71b06SSteven Whitehouse pos += bh->b_size; 984b1e71b06SSteven Whitehouse bh = bh->b_this_page; 985b1e71b06SSteven Whitehouse } while (bh != head); 986b1e71b06SSteven Whitehouse out: 987b1e71b06SSteven Whitehouse if (offset == 0) 988b1e71b06SSteven Whitehouse try_to_release_page(page, 0); 989b1e71b06SSteven Whitehouse } 990b1e71b06SSteven Whitehouse 991b1e71b06SSteven Whitehouse /** 992b1e71b06SSteven Whitehouse * gfs2_ok_for_dio - check that dio is valid on this file 993b1e71b06SSteven Whitehouse * @ip: The inode 994b1e71b06SSteven Whitehouse * @rw: READ or WRITE 995b1e71b06SSteven Whitehouse * @offset: The offset at which we are reading or writing 996b1e71b06SSteven Whitehouse * 997b1e71b06SSteven Whitehouse * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) 998b1e71b06SSteven Whitehouse * 1 (to accept the i/o request) 999b1e71b06SSteven Whitehouse */ 1000b1e71b06SSteven Whitehouse static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset) 1001b1e71b06SSteven Whitehouse { 1002b1e71b06SSteven Whitehouse /* 1003b1e71b06SSteven Whitehouse * Should we return an error here? I can't see that O_DIRECT for 1004b1e71b06SSteven Whitehouse * a stuffed file makes any sense. For now we'll silently fall 1005b1e71b06SSteven Whitehouse * back to buffered I/O 1006b1e71b06SSteven Whitehouse */ 1007b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 1008b1e71b06SSteven Whitehouse return 0; 1009b1e71b06SSteven Whitehouse 1010b1e71b06SSteven Whitehouse if (offset >= i_size_read(&ip->i_inode)) 1011b1e71b06SSteven Whitehouse return 0; 1012b1e71b06SSteven Whitehouse return 1; 1013b1e71b06SSteven Whitehouse } 1014b1e71b06SSteven Whitehouse 1015b1e71b06SSteven Whitehouse 1016b1e71b06SSteven Whitehouse 1017b1e71b06SSteven Whitehouse static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, 1018b1e71b06SSteven Whitehouse const struct iovec *iov, loff_t offset, 1019b1e71b06SSteven Whitehouse unsigned long nr_segs) 1020b1e71b06SSteven Whitehouse { 1021b1e71b06SSteven Whitehouse struct file *file = iocb->ki_filp; 1022b1e71b06SSteven Whitehouse struct inode *inode = file->f_mapping->host; 1023b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1024b1e71b06SSteven Whitehouse struct gfs2_holder gh; 1025b1e71b06SSteven Whitehouse int rv; 1026b1e71b06SSteven Whitehouse 1027b1e71b06SSteven Whitehouse /* 1028b1e71b06SSteven Whitehouse * Deferred lock, even if its a write, since we do no allocation 1029b1e71b06SSteven Whitehouse * on this path. All we need change is atime, and this lock mode 1030b1e71b06SSteven Whitehouse * ensures that other nodes have flushed their buffered read caches 1031b1e71b06SSteven Whitehouse * (i.e. their page cache entries for this inode). We do not, 1032b1e71b06SSteven Whitehouse * unfortunately have the option of only flushing a range like 1033b1e71b06SSteven Whitehouse * the VFS does. 1034b1e71b06SSteven Whitehouse */ 1035b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); 1036b1e71b06SSteven Whitehouse rv = gfs2_glock_nq(&gh); 1037b1e71b06SSteven Whitehouse if (rv) 1038b1e71b06SSteven Whitehouse return rv; 1039b1e71b06SSteven Whitehouse rv = gfs2_ok_for_dio(ip, rw, offset); 1040b1e71b06SSteven Whitehouse if (rv != 1) 1041b1e71b06SSteven Whitehouse goto out; /* dio not valid, fall back to buffered i/o */ 1042b1e71b06SSteven Whitehouse 1043eafdc7d1SChristoph Hellwig rv = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 1044eafdc7d1SChristoph Hellwig offset, nr_segs, gfs2_get_block_direct, 1045eafdc7d1SChristoph Hellwig NULL, NULL, 0); 1046b1e71b06SSteven Whitehouse out: 1047b1e71b06SSteven Whitehouse gfs2_glock_dq_m(1, &gh); 1048b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 1049b1e71b06SSteven Whitehouse return rv; 1050b1e71b06SSteven Whitehouse } 1051b1e71b06SSteven Whitehouse 1052b1e71b06SSteven Whitehouse /** 1053b1e71b06SSteven Whitehouse * gfs2_releasepage - free the metadata associated with a page 1054b1e71b06SSteven Whitehouse * @page: the page that's being released 1055b1e71b06SSteven Whitehouse * @gfp_mask: passed from Linux VFS, ignored by us 1056b1e71b06SSteven Whitehouse * 1057b1e71b06SSteven Whitehouse * Call try_to_free_buffers() if the buffers in this page can be 1058b1e71b06SSteven Whitehouse * released. 1059b1e71b06SSteven Whitehouse * 1060b1e71b06SSteven Whitehouse * Returns: 0 1061b1e71b06SSteven Whitehouse */ 1062b1e71b06SSteven Whitehouse 1063b1e71b06SSteven Whitehouse int gfs2_releasepage(struct page *page, gfp_t gfp_mask) 1064b1e71b06SSteven Whitehouse { 1065009d8518SSteven Whitehouse struct address_space *mapping = page->mapping; 1066009d8518SSteven Whitehouse struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); 1067b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 1068b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 1069b1e71b06SSteven Whitehouse 1070b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 1071b1e71b06SSteven Whitehouse return 0; 1072b1e71b06SSteven Whitehouse 1073b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 1074b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1075b1e71b06SSteven Whitehouse do { 1076b1e71b06SSteven Whitehouse if (atomic_read(&bh->b_count)) 1077b1e71b06SSteven Whitehouse goto cannot_release; 1078b1e71b06SSteven Whitehouse bd = bh->b_private; 1079b1e71b06SSteven Whitehouse if (bd && bd->bd_ail) 1080b1e71b06SSteven Whitehouse goto cannot_release; 1081b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, !buffer_pinned(bh)); 1082b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, !buffer_dirty(bh)); 1083b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1084b1e71b06SSteven Whitehouse } while(bh != head); 1085b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1086b1e71b06SSteven Whitehouse 1087b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1088b1e71b06SSteven Whitehouse do { 1089b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 1090b1e71b06SSteven Whitehouse bd = bh->b_private; 1091b1e71b06SSteven Whitehouse if (bd) { 1092b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, bd->bd_bh == bh); 1093b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr)); 1094b1e71b06SSteven Whitehouse if (!list_empty(&bd->bd_le.le_list)) { 1095b1e71b06SSteven Whitehouse if (!buffer_pinned(bh)) 1096b1e71b06SSteven Whitehouse list_del_init(&bd->bd_le.le_list); 1097b1e71b06SSteven Whitehouse else 1098b1e71b06SSteven Whitehouse bd = NULL; 1099b1e71b06SSteven Whitehouse } 1100b1e71b06SSteven Whitehouse if (bd) 1101b1e71b06SSteven Whitehouse bd->bd_bh = NULL; 1102b1e71b06SSteven Whitehouse bh->b_private = NULL; 1103b1e71b06SSteven Whitehouse } 1104b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1105b1e71b06SSteven Whitehouse if (bd) 1106b1e71b06SSteven Whitehouse kmem_cache_free(gfs2_bufdata_cachep, bd); 1107b1e71b06SSteven Whitehouse 1108b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1109b1e71b06SSteven Whitehouse } while (bh != head); 1110b1e71b06SSteven Whitehouse 1111b1e71b06SSteven Whitehouse return try_to_free_buffers(page); 1112b1e71b06SSteven Whitehouse cannot_release: 1113b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1114b1e71b06SSteven Whitehouse return 0; 1115b1e71b06SSteven Whitehouse } 1116b1e71b06SSteven Whitehouse 1117b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_writeback_aops = { 1118b1e71b06SSteven Whitehouse .writepage = gfs2_writeback_writepage, 1119b1e71b06SSteven Whitehouse .writepages = gfs2_writeback_writepages, 1120b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1121b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1122b1e71b06SSteven Whitehouse .sync_page = block_sync_page, 1123b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1124b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 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_ordered_aops = { 1135b1e71b06SSteven Whitehouse .writepage = gfs2_ordered_writepage, 1136b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1137b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1138b1e71b06SSteven Whitehouse .sync_page = block_sync_page, 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 .direct_IO = gfs2_direct_IO, 1146b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1147b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1148aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1149b1e71b06SSteven Whitehouse }; 1150b1e71b06SSteven Whitehouse 1151b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_jdata_aops = { 1152b1e71b06SSteven Whitehouse .writepage = gfs2_jdata_writepage, 1153b1e71b06SSteven Whitehouse .writepages = gfs2_jdata_writepages, 1154b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1155b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1156b1e71b06SSteven Whitehouse .sync_page = block_sync_page, 1157b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1158b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1159b1e71b06SSteven Whitehouse .set_page_dirty = gfs2_set_page_dirty, 1160b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1161b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1162b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1163b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1164aa261f54SAndi Kleen .error_remove_page = generic_error_remove_page, 1165b1e71b06SSteven Whitehouse }; 1166b1e71b06SSteven Whitehouse 1167b1e71b06SSteven Whitehouse void gfs2_set_aops(struct inode *inode) 1168b1e71b06SSteven Whitehouse { 1169b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1170b1e71b06SSteven Whitehouse 1171b1e71b06SSteven Whitehouse if (gfs2_is_writeback(ip)) 1172b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_writeback_aops; 1173b1e71b06SSteven Whitehouse else if (gfs2_is_ordered(ip)) 1174b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_ordered_aops; 1175b1e71b06SSteven Whitehouse else if (gfs2_is_jdata(ip)) 1176b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_jdata_aops; 1177b1e71b06SSteven Whitehouse else 1178b1e71b06SSteven Whitehouse BUG(); 1179b1e71b06SSteven Whitehouse } 1180b1e71b06SSteven Whitehouse 1181