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 139b1e71b06SSteven Whitehouse ret = mpage_writepage(page, gfs2_get_block_noalloc, wbc); 140b1e71b06SSteven Whitehouse if (ret == -EAGAIN) 141b1e71b06SSteven Whitehouse ret = block_write_full_page(page, gfs2_get_block_noalloc, wbc); 142b1e71b06SSteven Whitehouse return ret; 143b1e71b06SSteven Whitehouse } 144b1e71b06SSteven Whitehouse 145b1e71b06SSteven Whitehouse /** 146b1e71b06SSteven Whitehouse * gfs2_ordered_writepage - Write page for ordered data files 147b1e71b06SSteven Whitehouse * @page: The page to write 148b1e71b06SSteven Whitehouse * @wbc: The writeback control 149b1e71b06SSteven Whitehouse * 150b1e71b06SSteven Whitehouse */ 151b1e71b06SSteven Whitehouse 152b1e71b06SSteven Whitehouse static int gfs2_ordered_writepage(struct page *page, 153b1e71b06SSteven Whitehouse 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 int ret; 158b1e71b06SSteven Whitehouse 159b1e71b06SSteven Whitehouse ret = gfs2_writepage_common(page, wbc); 160b1e71b06SSteven Whitehouse if (ret <= 0) 161b1e71b06SSteven Whitehouse return ret; 162b1e71b06SSteven Whitehouse 163b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) { 164b1e71b06SSteven Whitehouse create_empty_buffers(page, inode->i_sb->s_blocksize, 165b1e71b06SSteven Whitehouse (1 << BH_Dirty)|(1 << BH_Uptodate)); 166b1e71b06SSteven Whitehouse } 167b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, 0, inode->i_sb->s_blocksize-1); 168b1e71b06SSteven Whitehouse return block_write_full_page(page, gfs2_get_block_noalloc, wbc); 169b1e71b06SSteven Whitehouse } 170b1e71b06SSteven Whitehouse 171b1e71b06SSteven Whitehouse /** 172b1e71b06SSteven Whitehouse * __gfs2_jdata_writepage - The core of jdata writepage 173b1e71b06SSteven Whitehouse * @page: The page to write 174b1e71b06SSteven Whitehouse * @wbc: The writeback control 175b1e71b06SSteven Whitehouse * 176b1e71b06SSteven Whitehouse * This is shared between writepage and writepages and implements the 177b1e71b06SSteven Whitehouse * core of the writepage operation. If a transaction is required then 178b1e71b06SSteven Whitehouse * PageChecked will have been set and the transaction will have 179b1e71b06SSteven Whitehouse * already been started before this is called. 180b1e71b06SSteven Whitehouse */ 181b1e71b06SSteven Whitehouse 182b1e71b06SSteven Whitehouse static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 183b1e71b06SSteven Whitehouse { 184b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 185b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 186b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 187b1e71b06SSteven Whitehouse 188b1e71b06SSteven Whitehouse if (PageChecked(page)) { 189b1e71b06SSteven Whitehouse ClearPageChecked(page); 190b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) { 191b1e71b06SSteven Whitehouse create_empty_buffers(page, inode->i_sb->s_blocksize, 192b1e71b06SSteven Whitehouse (1 << BH_Dirty)|(1 << BH_Uptodate)); 193b1e71b06SSteven Whitehouse } 194b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); 195b1e71b06SSteven Whitehouse } 196b1e71b06SSteven Whitehouse return block_write_full_page(page, gfs2_get_block_noalloc, wbc); 197b1e71b06SSteven Whitehouse } 198b1e71b06SSteven Whitehouse 199b1e71b06SSteven Whitehouse /** 200b1e71b06SSteven Whitehouse * gfs2_jdata_writepage - Write complete page 201b1e71b06SSteven Whitehouse * @page: Page to write 202b1e71b06SSteven Whitehouse * 203b1e71b06SSteven Whitehouse * Returns: errno 204b1e71b06SSteven Whitehouse * 205b1e71b06SSteven Whitehouse */ 206b1e71b06SSteven Whitehouse 207b1e71b06SSteven Whitehouse static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) 208b1e71b06SSteven Whitehouse { 209b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 210b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 211b1e71b06SSteven Whitehouse int ret; 212b1e71b06SSteven Whitehouse int done_trans = 0; 213b1e71b06SSteven Whitehouse 214b1e71b06SSteven Whitehouse if (PageChecked(page)) { 215b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_ALL) 216b1e71b06SSteven Whitehouse goto out_ignore; 217b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); 218b1e71b06SSteven Whitehouse if (ret) 219b1e71b06SSteven Whitehouse goto out_ignore; 220b1e71b06SSteven Whitehouse done_trans = 1; 221b1e71b06SSteven Whitehouse } 222b1e71b06SSteven Whitehouse ret = gfs2_writepage_common(page, wbc); 223b1e71b06SSteven Whitehouse if (ret > 0) 224b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 225b1e71b06SSteven Whitehouse if (done_trans) 226b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 227b1e71b06SSteven Whitehouse return ret; 228b1e71b06SSteven Whitehouse 229b1e71b06SSteven Whitehouse out_ignore: 230b1e71b06SSteven Whitehouse redirty_page_for_writepage(wbc, page); 231b1e71b06SSteven Whitehouse unlock_page(page); 232b1e71b06SSteven Whitehouse return 0; 233b1e71b06SSteven Whitehouse } 234b1e71b06SSteven Whitehouse 235b1e71b06SSteven Whitehouse /** 236b1e71b06SSteven Whitehouse * gfs2_writeback_writepages - Write a bunch of dirty pages back to disk 237b1e71b06SSteven Whitehouse * @mapping: The mapping to write 238b1e71b06SSteven Whitehouse * @wbc: Write-back control 239b1e71b06SSteven Whitehouse * 240b1e71b06SSteven Whitehouse * For the data=writeback case we can already ignore buffer heads 241b1e71b06SSteven Whitehouse * and write whole extents at once. This is a big reduction in the 242b1e71b06SSteven Whitehouse * number of I/O requests we send and the bmap calls we make in this case. 243b1e71b06SSteven Whitehouse */ 244b1e71b06SSteven Whitehouse static int gfs2_writeback_writepages(struct address_space *mapping, 245b1e71b06SSteven Whitehouse struct writeback_control *wbc) 246b1e71b06SSteven Whitehouse { 247b1e71b06SSteven Whitehouse return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); 248b1e71b06SSteven Whitehouse } 249b1e71b06SSteven Whitehouse 250b1e71b06SSteven Whitehouse /** 251b1e71b06SSteven Whitehouse * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages 252b1e71b06SSteven Whitehouse * @mapping: The mapping 253b1e71b06SSteven Whitehouse * @wbc: The writeback control 254b1e71b06SSteven Whitehouse * @writepage: The writepage function to call for each page 255b1e71b06SSteven Whitehouse * @pvec: The vector of pages 256b1e71b06SSteven Whitehouse * @nr_pages: The number of pages to write 257b1e71b06SSteven Whitehouse * 258b1e71b06SSteven Whitehouse * Returns: non-zero if loop should terminate, zero otherwise 259b1e71b06SSteven Whitehouse */ 260b1e71b06SSteven Whitehouse 261b1e71b06SSteven Whitehouse static int gfs2_write_jdata_pagevec(struct address_space *mapping, 262b1e71b06SSteven Whitehouse struct writeback_control *wbc, 263b1e71b06SSteven Whitehouse struct pagevec *pvec, 264b1e71b06SSteven Whitehouse int nr_pages, pgoff_t end) 265b1e71b06SSteven Whitehouse { 266b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 267b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 268b1e71b06SSteven Whitehouse loff_t i_size = i_size_read(inode); 269b1e71b06SSteven Whitehouse pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; 270b1e71b06SSteven Whitehouse unsigned offset = i_size & (PAGE_CACHE_SIZE-1); 271b1e71b06SSteven Whitehouse unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize); 272b1e71b06SSteven Whitehouse struct backing_dev_info *bdi = mapping->backing_dev_info; 273b1e71b06SSteven Whitehouse int i; 274b1e71b06SSteven Whitehouse int ret; 275b1e71b06SSteven Whitehouse 276b1e71b06SSteven Whitehouse ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); 277b1e71b06SSteven Whitehouse if (ret < 0) 278b1e71b06SSteven Whitehouse return ret; 279b1e71b06SSteven Whitehouse 280b1e71b06SSteven Whitehouse for(i = 0; i < nr_pages; i++) { 281b1e71b06SSteven Whitehouse struct page *page = pvec->pages[i]; 282b1e71b06SSteven Whitehouse 283b1e71b06SSteven Whitehouse lock_page(page); 284b1e71b06SSteven Whitehouse 285b1e71b06SSteven Whitehouse if (unlikely(page->mapping != mapping)) { 286b1e71b06SSteven Whitehouse unlock_page(page); 287b1e71b06SSteven Whitehouse continue; 288b1e71b06SSteven Whitehouse } 289b1e71b06SSteven Whitehouse 290b1e71b06SSteven Whitehouse if (!wbc->range_cyclic && page->index > end) { 291b1e71b06SSteven Whitehouse ret = 1; 292b1e71b06SSteven Whitehouse unlock_page(page); 293b1e71b06SSteven Whitehouse continue; 294b1e71b06SSteven Whitehouse } 295b1e71b06SSteven Whitehouse 296b1e71b06SSteven Whitehouse if (wbc->sync_mode != WB_SYNC_NONE) 297b1e71b06SSteven Whitehouse wait_on_page_writeback(page); 298b1e71b06SSteven Whitehouse 299b1e71b06SSteven Whitehouse if (PageWriteback(page) || 300b1e71b06SSteven Whitehouse !clear_page_dirty_for_io(page)) { 301b1e71b06SSteven Whitehouse unlock_page(page); 302b1e71b06SSteven Whitehouse continue; 303b1e71b06SSteven Whitehouse } 304b1e71b06SSteven Whitehouse 305b1e71b06SSteven Whitehouse /* Is the page fully outside i_size? (truncate in progress) */ 306b1e71b06SSteven Whitehouse if (page->index > end_index || (page->index == end_index && !offset)) { 307b1e71b06SSteven Whitehouse page->mapping->a_ops->invalidatepage(page, 0); 308b1e71b06SSteven Whitehouse unlock_page(page); 309b1e71b06SSteven Whitehouse continue; 310b1e71b06SSteven Whitehouse } 311b1e71b06SSteven Whitehouse 312b1e71b06SSteven Whitehouse ret = __gfs2_jdata_writepage(page, wbc); 313b1e71b06SSteven Whitehouse 314b1e71b06SSteven Whitehouse if (ret || (--(wbc->nr_to_write) <= 0)) 315b1e71b06SSteven Whitehouse ret = 1; 316b1e71b06SSteven Whitehouse if (wbc->nonblocking && bdi_write_congested(bdi)) { 317b1e71b06SSteven Whitehouse wbc->encountered_congestion = 1; 318b1e71b06SSteven Whitehouse ret = 1; 319b1e71b06SSteven Whitehouse } 320b1e71b06SSteven Whitehouse 321b1e71b06SSteven Whitehouse } 322b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 323b1e71b06SSteven Whitehouse return ret; 324b1e71b06SSteven Whitehouse } 325b1e71b06SSteven Whitehouse 326b1e71b06SSteven Whitehouse /** 327b1e71b06SSteven Whitehouse * gfs2_write_cache_jdata - Like write_cache_pages but different 328b1e71b06SSteven Whitehouse * @mapping: The mapping to write 329b1e71b06SSteven Whitehouse * @wbc: The writeback control 330b1e71b06SSteven Whitehouse * @writepage: The writepage function to call 331b1e71b06SSteven Whitehouse * @data: The data to pass to writepage 332b1e71b06SSteven Whitehouse * 333b1e71b06SSteven Whitehouse * The reason that we use our own function here is that we need to 334b1e71b06SSteven Whitehouse * start transactions before we grab page locks. This allows us 335b1e71b06SSteven Whitehouse * to get the ordering right. 336b1e71b06SSteven Whitehouse */ 337b1e71b06SSteven Whitehouse 338b1e71b06SSteven Whitehouse static int gfs2_write_cache_jdata(struct address_space *mapping, 339b1e71b06SSteven Whitehouse struct writeback_control *wbc) 340b1e71b06SSteven Whitehouse { 341b1e71b06SSteven Whitehouse struct backing_dev_info *bdi = mapping->backing_dev_info; 342b1e71b06SSteven Whitehouse int ret = 0; 343b1e71b06SSteven Whitehouse int done = 0; 344b1e71b06SSteven Whitehouse struct pagevec pvec; 345b1e71b06SSteven Whitehouse int nr_pages; 346b1e71b06SSteven Whitehouse pgoff_t index; 347b1e71b06SSteven Whitehouse pgoff_t end; 348b1e71b06SSteven Whitehouse int scanned = 0; 349b1e71b06SSteven Whitehouse int range_whole = 0; 350b1e71b06SSteven Whitehouse 351b1e71b06SSteven Whitehouse if (wbc->nonblocking && bdi_write_congested(bdi)) { 352b1e71b06SSteven Whitehouse wbc->encountered_congestion = 1; 353b1e71b06SSteven Whitehouse return 0; 354b1e71b06SSteven Whitehouse } 355b1e71b06SSteven Whitehouse 356b1e71b06SSteven Whitehouse pagevec_init(&pvec, 0); 357b1e71b06SSteven Whitehouse if (wbc->range_cyclic) { 358b1e71b06SSteven Whitehouse index = mapping->writeback_index; /* Start from prev offset */ 359b1e71b06SSteven Whitehouse end = -1; 360b1e71b06SSteven Whitehouse } else { 361b1e71b06SSteven Whitehouse index = wbc->range_start >> PAGE_CACHE_SHIFT; 362b1e71b06SSteven Whitehouse end = wbc->range_end >> PAGE_CACHE_SHIFT; 363b1e71b06SSteven Whitehouse if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 364b1e71b06SSteven Whitehouse range_whole = 1; 365b1e71b06SSteven Whitehouse scanned = 1; 366b1e71b06SSteven Whitehouse } 367b1e71b06SSteven Whitehouse 368b1e71b06SSteven Whitehouse retry: 369b1e71b06SSteven Whitehouse while (!done && (index <= end) && 370b1e71b06SSteven Whitehouse (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, 371b1e71b06SSteven Whitehouse PAGECACHE_TAG_DIRTY, 372b1e71b06SSteven Whitehouse min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { 373b1e71b06SSteven Whitehouse scanned = 1; 374b1e71b06SSteven Whitehouse ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end); 375b1e71b06SSteven Whitehouse if (ret) 376b1e71b06SSteven Whitehouse done = 1; 377b1e71b06SSteven Whitehouse if (ret > 0) 378b1e71b06SSteven Whitehouse ret = 0; 379b1e71b06SSteven Whitehouse 380b1e71b06SSteven Whitehouse pagevec_release(&pvec); 381b1e71b06SSteven Whitehouse cond_resched(); 382b1e71b06SSteven Whitehouse } 383b1e71b06SSteven Whitehouse 384b1e71b06SSteven Whitehouse if (!scanned && !done) { 385b1e71b06SSteven Whitehouse /* 386b1e71b06SSteven Whitehouse * We hit the last page and there is more work to be done: wrap 387b1e71b06SSteven Whitehouse * back to the start of the file 388b1e71b06SSteven Whitehouse */ 389b1e71b06SSteven Whitehouse scanned = 1; 390b1e71b06SSteven Whitehouse index = 0; 391b1e71b06SSteven Whitehouse goto retry; 392b1e71b06SSteven Whitehouse } 393b1e71b06SSteven Whitehouse 394b1e71b06SSteven Whitehouse if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 395b1e71b06SSteven Whitehouse mapping->writeback_index = index; 396b1e71b06SSteven Whitehouse return ret; 397b1e71b06SSteven Whitehouse } 398b1e71b06SSteven Whitehouse 399b1e71b06SSteven Whitehouse 400b1e71b06SSteven Whitehouse /** 401b1e71b06SSteven Whitehouse * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk 402b1e71b06SSteven Whitehouse * @mapping: The mapping to write 403b1e71b06SSteven Whitehouse * @wbc: The writeback control 404b1e71b06SSteven Whitehouse * 405b1e71b06SSteven Whitehouse */ 406b1e71b06SSteven Whitehouse 407b1e71b06SSteven Whitehouse static int gfs2_jdata_writepages(struct address_space *mapping, 408b1e71b06SSteven Whitehouse struct writeback_control *wbc) 409b1e71b06SSteven Whitehouse { 410b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 411b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 412b1e71b06SSteven Whitehouse int ret; 413b1e71b06SSteven Whitehouse 414b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 415b1e71b06SSteven Whitehouse if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { 416b1e71b06SSteven Whitehouse gfs2_log_flush(sdp, ip->i_gl); 417b1e71b06SSteven Whitehouse ret = gfs2_write_cache_jdata(mapping, wbc); 418b1e71b06SSteven Whitehouse } 419b1e71b06SSteven Whitehouse return ret; 420b1e71b06SSteven Whitehouse } 421b1e71b06SSteven Whitehouse 422b1e71b06SSteven Whitehouse /** 423b1e71b06SSteven Whitehouse * stuffed_readpage - Fill in a Linux page with stuffed file data 424b1e71b06SSteven Whitehouse * @ip: the inode 425b1e71b06SSteven Whitehouse * @page: the page 426b1e71b06SSteven Whitehouse * 427b1e71b06SSteven Whitehouse * Returns: errno 428b1e71b06SSteven Whitehouse */ 429b1e71b06SSteven Whitehouse 430b1e71b06SSteven Whitehouse static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) 431b1e71b06SSteven Whitehouse { 432b1e71b06SSteven Whitehouse struct buffer_head *dibh; 433b1e71b06SSteven Whitehouse void *kaddr; 434b1e71b06SSteven Whitehouse int error; 435b1e71b06SSteven Whitehouse 436b1e71b06SSteven Whitehouse /* 437b1e71b06SSteven Whitehouse * Due to the order of unstuffing files and ->fault(), we can be 438b1e71b06SSteven Whitehouse * asked for a zero page in the case of a stuffed file being extended, 439b1e71b06SSteven Whitehouse * so we need to supply one here. It doesn't happen often. 440b1e71b06SSteven Whitehouse */ 441b1e71b06SSteven Whitehouse if (unlikely(page->index)) { 442b1e71b06SSteven Whitehouse zero_user(page, 0, PAGE_CACHE_SIZE); 443b1e71b06SSteven Whitehouse SetPageUptodate(page); 444b1e71b06SSteven Whitehouse return 0; 445b1e71b06SSteven Whitehouse } 446b1e71b06SSteven Whitehouse 447b1e71b06SSteven Whitehouse error = gfs2_meta_inode_buffer(ip, &dibh); 448b1e71b06SSteven Whitehouse if (error) 449b1e71b06SSteven Whitehouse return error; 450b1e71b06SSteven Whitehouse 451b1e71b06SSteven Whitehouse kaddr = kmap_atomic(page, KM_USER0); 452b1e71b06SSteven Whitehouse memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), 453b1e71b06SSteven Whitehouse ip->i_disksize); 454b1e71b06SSteven Whitehouse memset(kaddr + ip->i_disksize, 0, PAGE_CACHE_SIZE - ip->i_disksize); 455b1e71b06SSteven Whitehouse kunmap_atomic(kaddr, KM_USER0); 456b1e71b06SSteven Whitehouse flush_dcache_page(page); 457b1e71b06SSteven Whitehouse brelse(dibh); 458b1e71b06SSteven Whitehouse SetPageUptodate(page); 459b1e71b06SSteven Whitehouse 460b1e71b06SSteven Whitehouse return 0; 461b1e71b06SSteven Whitehouse } 462b1e71b06SSteven Whitehouse 463b1e71b06SSteven Whitehouse 464b1e71b06SSteven Whitehouse /** 465b1e71b06SSteven Whitehouse * __gfs2_readpage - readpage 466b1e71b06SSteven Whitehouse * @file: The file to read a page for 467b1e71b06SSteven Whitehouse * @page: The page to read 468b1e71b06SSteven Whitehouse * 469b1e71b06SSteven Whitehouse * This is the core of gfs2's readpage. Its used by the internal file 470b1e71b06SSteven Whitehouse * reading code as in that case we already hold the glock. Also its 471b1e71b06SSteven Whitehouse * called by gfs2_readpage() once the required lock has been granted. 472b1e71b06SSteven Whitehouse * 473b1e71b06SSteven Whitehouse */ 474b1e71b06SSteven Whitehouse 475b1e71b06SSteven Whitehouse static int __gfs2_readpage(void *file, struct page *page) 476b1e71b06SSteven Whitehouse { 477b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(page->mapping->host); 478b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 479b1e71b06SSteven Whitehouse int error; 480b1e71b06SSteven Whitehouse 481b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 482b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 483b1e71b06SSteven Whitehouse unlock_page(page); 484b1e71b06SSteven Whitehouse } else { 485b1e71b06SSteven Whitehouse error = mpage_readpage(page, gfs2_block_map); 486b1e71b06SSteven Whitehouse } 487b1e71b06SSteven Whitehouse 488b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 489b1e71b06SSteven Whitehouse return -EIO; 490b1e71b06SSteven Whitehouse 491b1e71b06SSteven Whitehouse return error; 492b1e71b06SSteven Whitehouse } 493b1e71b06SSteven Whitehouse 494b1e71b06SSteven Whitehouse /** 495b1e71b06SSteven Whitehouse * gfs2_readpage - read a page of a file 496b1e71b06SSteven Whitehouse * @file: The file to read 497b1e71b06SSteven Whitehouse * @page: The page of the file 498b1e71b06SSteven Whitehouse * 499b1e71b06SSteven Whitehouse * This deals with the locking required. We have to unlock and 500b1e71b06SSteven Whitehouse * relock the page in order to get the locking in the right 501b1e71b06SSteven Whitehouse * order. 502b1e71b06SSteven Whitehouse */ 503b1e71b06SSteven Whitehouse 504b1e71b06SSteven Whitehouse static int gfs2_readpage(struct file *file, struct page *page) 505b1e71b06SSteven Whitehouse { 506b1e71b06SSteven Whitehouse struct address_space *mapping = page->mapping; 507b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 508b1e71b06SSteven Whitehouse struct gfs2_holder gh; 509b1e71b06SSteven Whitehouse int error; 510b1e71b06SSteven Whitehouse 511b1e71b06SSteven Whitehouse unlock_page(page); 512b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 513b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&gh); 514b1e71b06SSteven Whitehouse if (unlikely(error)) 515b1e71b06SSteven Whitehouse goto out; 516b1e71b06SSteven Whitehouse error = AOP_TRUNCATED_PAGE; 517b1e71b06SSteven Whitehouse lock_page(page); 518b1e71b06SSteven Whitehouse if (page->mapping == mapping && !PageUptodate(page)) 519b1e71b06SSteven Whitehouse error = __gfs2_readpage(file, page); 520b1e71b06SSteven Whitehouse else 521b1e71b06SSteven Whitehouse unlock_page(page); 522b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 523b1e71b06SSteven Whitehouse out: 524b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 525b1e71b06SSteven Whitehouse if (error && error != AOP_TRUNCATED_PAGE) 526b1e71b06SSteven Whitehouse lock_page(page); 527b1e71b06SSteven Whitehouse return error; 528b1e71b06SSteven Whitehouse } 529b1e71b06SSteven Whitehouse 530b1e71b06SSteven Whitehouse /** 531b1e71b06SSteven Whitehouse * gfs2_internal_read - read an internal file 532b1e71b06SSteven Whitehouse * @ip: The gfs2 inode 533b1e71b06SSteven Whitehouse * @ra_state: The readahead state (or NULL for no readahead) 534b1e71b06SSteven Whitehouse * @buf: The buffer to fill 535b1e71b06SSteven Whitehouse * @pos: The file position 536b1e71b06SSteven Whitehouse * @size: The amount to read 537b1e71b06SSteven Whitehouse * 538b1e71b06SSteven Whitehouse */ 539b1e71b06SSteven Whitehouse 540b1e71b06SSteven Whitehouse int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, 541b1e71b06SSteven Whitehouse char *buf, loff_t *pos, unsigned size) 542b1e71b06SSteven Whitehouse { 543b1e71b06SSteven Whitehouse struct address_space *mapping = ip->i_inode.i_mapping; 544b1e71b06SSteven Whitehouse unsigned long index = *pos / PAGE_CACHE_SIZE; 545b1e71b06SSteven Whitehouse unsigned offset = *pos & (PAGE_CACHE_SIZE - 1); 546b1e71b06SSteven Whitehouse unsigned copied = 0; 547b1e71b06SSteven Whitehouse unsigned amt; 548b1e71b06SSteven Whitehouse struct page *page; 549b1e71b06SSteven Whitehouse void *p; 550b1e71b06SSteven Whitehouse 551b1e71b06SSteven Whitehouse do { 552b1e71b06SSteven Whitehouse amt = size - copied; 553b1e71b06SSteven Whitehouse if (offset + size > PAGE_CACHE_SIZE) 554b1e71b06SSteven Whitehouse amt = PAGE_CACHE_SIZE - offset; 555b1e71b06SSteven Whitehouse page = read_cache_page(mapping, index, __gfs2_readpage, NULL); 556b1e71b06SSteven Whitehouse if (IS_ERR(page)) 557b1e71b06SSteven Whitehouse return PTR_ERR(page); 558b1e71b06SSteven Whitehouse p = kmap_atomic(page, KM_USER0); 559b1e71b06SSteven Whitehouse memcpy(buf + copied, p + offset, amt); 560b1e71b06SSteven Whitehouse kunmap_atomic(p, KM_USER0); 561b1e71b06SSteven Whitehouse mark_page_accessed(page); 562b1e71b06SSteven Whitehouse page_cache_release(page); 563b1e71b06SSteven Whitehouse copied += amt; 564b1e71b06SSteven Whitehouse index++; 565b1e71b06SSteven Whitehouse offset = 0; 566b1e71b06SSteven Whitehouse } while(copied < size); 567b1e71b06SSteven Whitehouse (*pos) += size; 568b1e71b06SSteven Whitehouse return size; 569b1e71b06SSteven Whitehouse } 570b1e71b06SSteven Whitehouse 571b1e71b06SSteven Whitehouse /** 572b1e71b06SSteven Whitehouse * gfs2_readpages - Read a bunch of pages at once 573b1e71b06SSteven Whitehouse * 574b1e71b06SSteven Whitehouse * Some notes: 575b1e71b06SSteven Whitehouse * 1. This is only for readahead, so we can simply ignore any things 576b1e71b06SSteven Whitehouse * which are slightly inconvenient (such as locking conflicts between 577b1e71b06SSteven Whitehouse * the page lock and the glock) and return having done no I/O. Its 578b1e71b06SSteven Whitehouse * obviously not something we'd want to do on too regular a basis. 579b1e71b06SSteven Whitehouse * Any I/O we ignore at this time will be done via readpage later. 580b1e71b06SSteven Whitehouse * 2. We don't handle stuffed files here we let readpage do the honours. 581b1e71b06SSteven Whitehouse * 3. mpage_readpages() does most of the heavy lifting in the common case. 582b1e71b06SSteven Whitehouse * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. 583b1e71b06SSteven Whitehouse */ 584b1e71b06SSteven Whitehouse 585b1e71b06SSteven Whitehouse static int gfs2_readpages(struct file *file, struct address_space *mapping, 586b1e71b06SSteven Whitehouse struct list_head *pages, unsigned nr_pages) 587b1e71b06SSteven Whitehouse { 588b1e71b06SSteven Whitehouse struct inode *inode = mapping->host; 589b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 590b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 591b1e71b06SSteven Whitehouse struct gfs2_holder gh; 592b1e71b06SSteven Whitehouse int ret; 593b1e71b06SSteven Whitehouse 594b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 595b1e71b06SSteven Whitehouse ret = gfs2_glock_nq(&gh); 596b1e71b06SSteven Whitehouse if (unlikely(ret)) 597b1e71b06SSteven Whitehouse goto out_uninit; 598b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 599b1e71b06SSteven Whitehouse ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); 600b1e71b06SSteven Whitehouse gfs2_glock_dq(&gh); 601b1e71b06SSteven Whitehouse out_uninit: 602b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 603b1e71b06SSteven Whitehouse if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 604b1e71b06SSteven Whitehouse ret = -EIO; 605b1e71b06SSteven Whitehouse return ret; 606b1e71b06SSteven Whitehouse } 607b1e71b06SSteven Whitehouse 608b1e71b06SSteven Whitehouse /** 609b1e71b06SSteven Whitehouse * gfs2_write_begin - Begin to write to a file 610b1e71b06SSteven Whitehouse * @file: The file to write to 611b1e71b06SSteven Whitehouse * @mapping: The mapping in which to write 612b1e71b06SSteven Whitehouse * @pos: The file offset at which to start writing 613b1e71b06SSteven Whitehouse * @len: Length of the write 614b1e71b06SSteven Whitehouse * @flags: Various flags 615b1e71b06SSteven Whitehouse * @pagep: Pointer to return the page 616b1e71b06SSteven Whitehouse * @fsdata: Pointer to return fs data (unused by GFS2) 617b1e71b06SSteven Whitehouse * 618b1e71b06SSteven Whitehouse * Returns: errno 619b1e71b06SSteven Whitehouse */ 620b1e71b06SSteven Whitehouse 621b1e71b06SSteven Whitehouse static int gfs2_write_begin(struct file *file, struct address_space *mapping, 622b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned flags, 623b1e71b06SSteven Whitehouse struct page **pagep, void **fsdata) 624b1e71b06SSteven Whitehouse { 625b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 626b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(mapping->host); 6271946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 628b1e71b06SSteven Whitehouse unsigned int data_blocks = 0, ind_blocks = 0, rblocks; 629b1e71b06SSteven Whitehouse int alloc_required; 630b1e71b06SSteven Whitehouse int error = 0; 631b1e71b06SSteven Whitehouse struct gfs2_alloc *al; 632b1e71b06SSteven Whitehouse pgoff_t index = pos >> PAGE_CACHE_SHIFT; 633b1e71b06SSteven Whitehouse unsigned from = pos & (PAGE_CACHE_SIZE - 1); 634b1e71b06SSteven Whitehouse unsigned to = from + len; 635b1e71b06SSteven Whitehouse struct page *page; 636b1e71b06SSteven Whitehouse 637b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); 638b1e71b06SSteven Whitehouse error = gfs2_glock_nq(&ip->i_gh); 639b1e71b06SSteven Whitehouse if (unlikely(error)) 640b1e71b06SSteven Whitehouse goto out_uninit; 6411946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 6421946f70aSBenjamin Marzinski error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 6431946f70aSBenjamin Marzinski GL_NOCACHE, &m_ip->i_gh); 6441946f70aSBenjamin Marzinski if (unlikely(error)) { 6451946f70aSBenjamin Marzinski gfs2_glock_dq(&ip->i_gh); 6461946f70aSBenjamin Marzinski goto out_uninit; 6471946f70aSBenjamin Marzinski } 6481946f70aSBenjamin Marzinski } 649b1e71b06SSteven Whitehouse 650b1e71b06SSteven Whitehouse error = gfs2_write_alloc_required(ip, pos, len, &alloc_required); 651b1e71b06SSteven Whitehouse if (error) 652b1e71b06SSteven Whitehouse goto out_unlock; 653b1e71b06SSteven Whitehouse 654b1e71b06SSteven Whitehouse if (alloc_required || gfs2_is_jdata(ip)) 655b1e71b06SSteven Whitehouse gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); 656b1e71b06SSteven Whitehouse 657b1e71b06SSteven Whitehouse if (alloc_required) { 658b1e71b06SSteven Whitehouse al = gfs2_alloc_get(ip); 659b1e71b06SSteven Whitehouse if (!al) { 660b1e71b06SSteven Whitehouse error = -ENOMEM; 661b1e71b06SSteven Whitehouse goto out_unlock; 662b1e71b06SSteven Whitehouse } 663b1e71b06SSteven Whitehouse 664b1e71b06SSteven Whitehouse error = gfs2_quota_lock_check(ip); 665b1e71b06SSteven Whitehouse if (error) 666b1e71b06SSteven Whitehouse goto out_alloc_put; 667b1e71b06SSteven Whitehouse 668b1e71b06SSteven Whitehouse al->al_requested = data_blocks + ind_blocks; 669b1e71b06SSteven Whitehouse error = gfs2_inplace_reserve(ip); 670b1e71b06SSteven Whitehouse if (error) 671b1e71b06SSteven Whitehouse goto out_qunlock; 672b1e71b06SSteven Whitehouse } 673b1e71b06SSteven Whitehouse 674b1e71b06SSteven Whitehouse rblocks = RES_DINODE + ind_blocks; 675b1e71b06SSteven Whitehouse if (gfs2_is_jdata(ip)) 676b1e71b06SSteven Whitehouse rblocks += data_blocks ? data_blocks : 1; 677b1e71b06SSteven Whitehouse if (ind_blocks || data_blocks) 678b1e71b06SSteven Whitehouse rblocks += RES_STATFS + RES_QUOTA; 6791946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) 6801946f70aSBenjamin Marzinski rblocks += 2 * RES_STATFS; 681b1e71b06SSteven Whitehouse 682b1e71b06SSteven Whitehouse error = gfs2_trans_begin(sdp, rblocks, 683b1e71b06SSteven Whitehouse PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); 684b1e71b06SSteven Whitehouse if (error) 685b1e71b06SSteven Whitehouse goto out_trans_fail; 686b1e71b06SSteven Whitehouse 687b1e71b06SSteven Whitehouse error = -ENOMEM; 688b1e71b06SSteven Whitehouse flags |= AOP_FLAG_NOFS; 689b1e71b06SSteven Whitehouse page = grab_cache_page_write_begin(mapping, index, flags); 690b1e71b06SSteven Whitehouse *pagep = page; 691b1e71b06SSteven Whitehouse if (unlikely(!page)) 692b1e71b06SSteven Whitehouse goto out_endtrans; 693b1e71b06SSteven Whitehouse 694b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) { 695b1e71b06SSteven Whitehouse error = 0; 696b1e71b06SSteven Whitehouse if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { 697b1e71b06SSteven Whitehouse error = gfs2_unstuff_dinode(ip, page); 698b1e71b06SSteven Whitehouse if (error == 0) 699b1e71b06SSteven Whitehouse goto prepare_write; 700b1e71b06SSteven Whitehouse } else if (!PageUptodate(page)) { 701b1e71b06SSteven Whitehouse error = stuffed_readpage(ip, page); 702b1e71b06SSteven Whitehouse } 703b1e71b06SSteven Whitehouse goto out; 704b1e71b06SSteven Whitehouse } 705b1e71b06SSteven Whitehouse 706b1e71b06SSteven Whitehouse prepare_write: 707b1e71b06SSteven Whitehouse error = block_prepare_write(page, from, to, gfs2_block_map); 708b1e71b06SSteven Whitehouse out: 709b1e71b06SSteven Whitehouse if (error == 0) 710b1e71b06SSteven Whitehouse return 0; 711b1e71b06SSteven Whitehouse 712b1e71b06SSteven Whitehouse page_cache_release(page); 713b1e71b06SSteven Whitehouse if (pos + len > ip->i_inode.i_size) 714b1e71b06SSteven Whitehouse vmtruncate(&ip->i_inode, ip->i_inode.i_size); 715b1e71b06SSteven Whitehouse out_endtrans: 716b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 717b1e71b06SSteven Whitehouse out_trans_fail: 718b1e71b06SSteven Whitehouse if (alloc_required) { 719b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 720b1e71b06SSteven Whitehouse out_qunlock: 721b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 722b1e71b06SSteven Whitehouse out_alloc_put: 723b1e71b06SSteven Whitehouse gfs2_alloc_put(ip); 724b1e71b06SSteven Whitehouse } 725b1e71b06SSteven Whitehouse out_unlock: 7261946f70aSBenjamin Marzinski if (&ip->i_inode == sdp->sd_rindex) { 7271946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 7281946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 7291946f70aSBenjamin Marzinski } 730b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 731b1e71b06SSteven Whitehouse out_uninit: 732b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 733b1e71b06SSteven Whitehouse return error; 734b1e71b06SSteven Whitehouse } 735b1e71b06SSteven Whitehouse 736b1e71b06SSteven Whitehouse /** 737b1e71b06SSteven Whitehouse * adjust_fs_space - Adjusts the free space available due to gfs2_grow 738b1e71b06SSteven Whitehouse * @inode: the rindex inode 739b1e71b06SSteven Whitehouse */ 740b1e71b06SSteven Whitehouse static void adjust_fs_space(struct inode *inode) 741b1e71b06SSteven Whitehouse { 742b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; 7431946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 7441946f70aSBenjamin Marzinski struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 745b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 746b1e71b06SSteven Whitehouse struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 7471946f70aSBenjamin Marzinski struct buffer_head *m_bh, *l_bh; 748b1e71b06SSteven Whitehouse u64 fs_total, new_free; 749b1e71b06SSteven Whitehouse 750b1e71b06SSteven Whitehouse /* Total up the file system space, according to the latest rindex. */ 751b1e71b06SSteven Whitehouse fs_total = gfs2_ri_total(sdp); 7521946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) 7531946f70aSBenjamin Marzinski return; 754b1e71b06SSteven Whitehouse 755b1e71b06SSteven Whitehouse spin_lock(&sdp->sd_statfs_spin); 7561946f70aSBenjamin Marzinski gfs2_statfs_change_in(m_sc, m_bh->b_data + 7571946f70aSBenjamin Marzinski sizeof(struct gfs2_dinode)); 758b1e71b06SSteven Whitehouse if (fs_total > (m_sc->sc_total + l_sc->sc_total)) 759b1e71b06SSteven Whitehouse new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); 760b1e71b06SSteven Whitehouse else 761b1e71b06SSteven Whitehouse new_free = 0; 762b1e71b06SSteven Whitehouse spin_unlock(&sdp->sd_statfs_spin); 763b1e71b06SSteven Whitehouse fs_warn(sdp, "File system extended by %llu blocks.\n", 764b1e71b06SSteven Whitehouse (unsigned long long)new_free); 765b1e71b06SSteven Whitehouse gfs2_statfs_change(sdp, new_free, new_free, 0); 7661946f70aSBenjamin Marzinski 7671946f70aSBenjamin Marzinski if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) 7681946f70aSBenjamin Marzinski goto out; 7691946f70aSBenjamin Marzinski update_statfs(sdp, m_bh, l_bh); 7701946f70aSBenjamin Marzinski brelse(l_bh); 7711946f70aSBenjamin Marzinski out: 7721946f70aSBenjamin Marzinski brelse(m_bh); 773b1e71b06SSteven Whitehouse } 774b1e71b06SSteven Whitehouse 775b1e71b06SSteven Whitehouse /** 776b1e71b06SSteven Whitehouse * gfs2_stuffed_write_end - Write end for stuffed files 777b1e71b06SSteven Whitehouse * @inode: The inode 778b1e71b06SSteven Whitehouse * @dibh: The buffer_head containing the on-disk inode 779b1e71b06SSteven Whitehouse * @pos: The file position 780b1e71b06SSteven Whitehouse * @len: The length of the write 781b1e71b06SSteven Whitehouse * @copied: How much was actually copied by the VFS 782b1e71b06SSteven Whitehouse * @page: The page 783b1e71b06SSteven Whitehouse * 784b1e71b06SSteven Whitehouse * This copies the data from the page into the inode block after 785b1e71b06SSteven Whitehouse * the inode data structure itself. 786b1e71b06SSteven Whitehouse * 787b1e71b06SSteven Whitehouse * Returns: errno 788b1e71b06SSteven Whitehouse */ 789b1e71b06SSteven Whitehouse static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, 790b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 791b1e71b06SSteven Whitehouse struct page *page) 792b1e71b06SSteven Whitehouse { 793b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 794b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 7951946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 796b1e71b06SSteven Whitehouse u64 to = pos + copied; 797b1e71b06SSteven Whitehouse void *kaddr; 798b1e71b06SSteven Whitehouse unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); 799b1e71b06SSteven Whitehouse struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 800b1e71b06SSteven Whitehouse 801b1e71b06SSteven Whitehouse BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode))); 802b1e71b06SSteven Whitehouse kaddr = kmap_atomic(page, KM_USER0); 803b1e71b06SSteven Whitehouse memcpy(buf + pos, kaddr + pos, copied); 804b1e71b06SSteven Whitehouse memset(kaddr + pos + copied, 0, len - copied); 805b1e71b06SSteven Whitehouse flush_dcache_page(page); 806b1e71b06SSteven Whitehouse kunmap_atomic(kaddr, KM_USER0); 807b1e71b06SSteven Whitehouse 808b1e71b06SSteven Whitehouse if (!PageUptodate(page)) 809b1e71b06SSteven Whitehouse SetPageUptodate(page); 810b1e71b06SSteven Whitehouse unlock_page(page); 811b1e71b06SSteven Whitehouse page_cache_release(page); 812b1e71b06SSteven Whitehouse 813b1e71b06SSteven Whitehouse if (copied) { 814b1e71b06SSteven Whitehouse if (inode->i_size < to) { 815b1e71b06SSteven Whitehouse i_size_write(inode, to); 816b1e71b06SSteven Whitehouse ip->i_disksize = inode->i_size; 817b1e71b06SSteven Whitehouse } 818b1e71b06SSteven Whitehouse gfs2_dinode_out(ip, di); 819b1e71b06SSteven Whitehouse mark_inode_dirty(inode); 820b1e71b06SSteven Whitehouse } 821b1e71b06SSteven Whitehouse 822b1e71b06SSteven Whitehouse if (inode == sdp->sd_rindex) 823b1e71b06SSteven Whitehouse adjust_fs_space(inode); 824b1e71b06SSteven Whitehouse 825b1e71b06SSteven Whitehouse brelse(dibh); 826b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 8271946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 8281946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 8291946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 8301946f70aSBenjamin Marzinski } 831b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 832b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 833b1e71b06SSteven Whitehouse return copied; 834b1e71b06SSteven Whitehouse } 835b1e71b06SSteven Whitehouse 836b1e71b06SSteven Whitehouse /** 837b1e71b06SSteven Whitehouse * gfs2_write_end 838b1e71b06SSteven Whitehouse * @file: The file to write to 839b1e71b06SSteven Whitehouse * @mapping: The address space to write to 840b1e71b06SSteven Whitehouse * @pos: The file position 841b1e71b06SSteven Whitehouse * @len: The length of the data 842b1e71b06SSteven Whitehouse * @copied: 843b1e71b06SSteven Whitehouse * @page: The page that has been written 844b1e71b06SSteven Whitehouse * @fsdata: The fsdata (unused in GFS2) 845b1e71b06SSteven Whitehouse * 846b1e71b06SSteven Whitehouse * The main write_end function for GFS2. We have a separate one for 847b1e71b06SSteven Whitehouse * stuffed files as they are slightly different, otherwise we just 848b1e71b06SSteven Whitehouse * put our locking around the VFS provided functions. 849b1e71b06SSteven Whitehouse * 850b1e71b06SSteven Whitehouse * Returns: errno 851b1e71b06SSteven Whitehouse */ 852b1e71b06SSteven Whitehouse 853b1e71b06SSteven Whitehouse static int gfs2_write_end(struct file *file, struct address_space *mapping, 854b1e71b06SSteven Whitehouse loff_t pos, unsigned len, unsigned copied, 855b1e71b06SSteven Whitehouse struct page *page, void *fsdata) 856b1e71b06SSteven Whitehouse { 857b1e71b06SSteven Whitehouse struct inode *inode = page->mapping->host; 858b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 859b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 8601946f70aSBenjamin Marzinski struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 861b1e71b06SSteven Whitehouse struct buffer_head *dibh; 862b1e71b06SSteven Whitehouse struct gfs2_alloc *al = ip->i_alloc; 863b1e71b06SSteven Whitehouse unsigned int from = pos & (PAGE_CACHE_SIZE - 1); 864b1e71b06SSteven Whitehouse unsigned int to = from + len; 865b1e71b06SSteven Whitehouse int ret; 866b1e71b06SSteven Whitehouse 867b1e71b06SSteven Whitehouse BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); 868b1e71b06SSteven Whitehouse 869b1e71b06SSteven Whitehouse ret = gfs2_meta_inode_buffer(ip, &dibh); 870b1e71b06SSteven Whitehouse if (unlikely(ret)) { 871b1e71b06SSteven Whitehouse unlock_page(page); 872b1e71b06SSteven Whitehouse page_cache_release(page); 873b1e71b06SSteven Whitehouse goto failed; 874b1e71b06SSteven Whitehouse } 875b1e71b06SSteven Whitehouse 876b1e71b06SSteven Whitehouse gfs2_trans_add_bh(ip->i_gl, dibh, 1); 877b1e71b06SSteven Whitehouse 878b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 879b1e71b06SSteven Whitehouse return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); 880b1e71b06SSteven Whitehouse 881b1e71b06SSteven Whitehouse if (!gfs2_is_writeback(ip)) 882b1e71b06SSteven Whitehouse gfs2_page_add_databufs(ip, page, from, to); 883b1e71b06SSteven Whitehouse 884b1e71b06SSteven Whitehouse ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); 885b1e71b06SSteven Whitehouse if (ret > 0) { 886b1e71b06SSteven Whitehouse if (inode->i_size > ip->i_disksize) 887b1e71b06SSteven Whitehouse ip->i_disksize = inode->i_size; 888b1e71b06SSteven Whitehouse gfs2_dinode_out(ip, dibh->b_data); 889b1e71b06SSteven Whitehouse mark_inode_dirty(inode); 890b1e71b06SSteven Whitehouse } 891b1e71b06SSteven Whitehouse 892b1e71b06SSteven Whitehouse if (inode == sdp->sd_rindex) 893b1e71b06SSteven Whitehouse adjust_fs_space(inode); 894b1e71b06SSteven Whitehouse 895b1e71b06SSteven Whitehouse brelse(dibh); 896b1e71b06SSteven Whitehouse gfs2_trans_end(sdp); 897b1e71b06SSteven Whitehouse failed: 898b1e71b06SSteven Whitehouse if (al) { 899b1e71b06SSteven Whitehouse gfs2_inplace_release(ip); 900b1e71b06SSteven Whitehouse gfs2_quota_unlock(ip); 901b1e71b06SSteven Whitehouse gfs2_alloc_put(ip); 902b1e71b06SSteven Whitehouse } 9031946f70aSBenjamin Marzinski if (inode == sdp->sd_rindex) { 9041946f70aSBenjamin Marzinski gfs2_glock_dq(&m_ip->i_gh); 9051946f70aSBenjamin Marzinski gfs2_holder_uninit(&m_ip->i_gh); 9061946f70aSBenjamin Marzinski } 907b1e71b06SSteven Whitehouse gfs2_glock_dq(&ip->i_gh); 908b1e71b06SSteven Whitehouse gfs2_holder_uninit(&ip->i_gh); 909b1e71b06SSteven Whitehouse return ret; 910b1e71b06SSteven Whitehouse } 911b1e71b06SSteven Whitehouse 912b1e71b06SSteven Whitehouse /** 913b1e71b06SSteven Whitehouse * gfs2_set_page_dirty - Page dirtying function 914b1e71b06SSteven Whitehouse * @page: The page to dirty 915b1e71b06SSteven Whitehouse * 916b1e71b06SSteven Whitehouse * Returns: 1 if it dirtyed the page, or 0 otherwise 917b1e71b06SSteven Whitehouse */ 918b1e71b06SSteven Whitehouse 919b1e71b06SSteven Whitehouse static int gfs2_set_page_dirty(struct page *page) 920b1e71b06SSteven Whitehouse { 921b1e71b06SSteven Whitehouse SetPageChecked(page); 922b1e71b06SSteven Whitehouse return __set_page_dirty_buffers(page); 923b1e71b06SSteven Whitehouse } 924b1e71b06SSteven Whitehouse 925b1e71b06SSteven Whitehouse /** 926b1e71b06SSteven Whitehouse * gfs2_bmap - Block map function 927b1e71b06SSteven Whitehouse * @mapping: Address space info 928b1e71b06SSteven Whitehouse * @lblock: The block to map 929b1e71b06SSteven Whitehouse * 930b1e71b06SSteven Whitehouse * Returns: The disk address for the block or 0 on hole or error 931b1e71b06SSteven Whitehouse */ 932b1e71b06SSteven Whitehouse 933b1e71b06SSteven Whitehouse static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) 934b1e71b06SSteven Whitehouse { 935b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(mapping->host); 936b1e71b06SSteven Whitehouse struct gfs2_holder i_gh; 937b1e71b06SSteven Whitehouse sector_t dblock = 0; 938b1e71b06SSteven Whitehouse int error; 939b1e71b06SSteven Whitehouse 940b1e71b06SSteven Whitehouse error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 941b1e71b06SSteven Whitehouse if (error) 942b1e71b06SSteven Whitehouse return 0; 943b1e71b06SSteven Whitehouse 944b1e71b06SSteven Whitehouse if (!gfs2_is_stuffed(ip)) 945b1e71b06SSteven Whitehouse dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); 946b1e71b06SSteven Whitehouse 947b1e71b06SSteven Whitehouse gfs2_glock_dq_uninit(&i_gh); 948b1e71b06SSteven Whitehouse 949b1e71b06SSteven Whitehouse return dblock; 950b1e71b06SSteven Whitehouse } 951b1e71b06SSteven Whitehouse 952b1e71b06SSteven Whitehouse static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) 953b1e71b06SSteven Whitehouse { 954b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 955b1e71b06SSteven Whitehouse 956b1e71b06SSteven Whitehouse lock_buffer(bh); 957b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 958b1e71b06SSteven Whitehouse clear_buffer_dirty(bh); 959b1e71b06SSteven Whitehouse bd = bh->b_private; 960b1e71b06SSteven Whitehouse if (bd) { 961b1e71b06SSteven Whitehouse if (!list_empty(&bd->bd_le.le_list) && !buffer_pinned(bh)) 962b1e71b06SSteven Whitehouse list_del_init(&bd->bd_le.le_list); 963b1e71b06SSteven Whitehouse else 964b1e71b06SSteven Whitehouse gfs2_remove_from_journal(bh, current->journal_info, 0); 965b1e71b06SSteven Whitehouse } 966b1e71b06SSteven Whitehouse bh->b_bdev = NULL; 967b1e71b06SSteven Whitehouse clear_buffer_mapped(bh); 968b1e71b06SSteven Whitehouse clear_buffer_req(bh); 969b1e71b06SSteven Whitehouse clear_buffer_new(bh); 970b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 971b1e71b06SSteven Whitehouse unlock_buffer(bh); 972b1e71b06SSteven Whitehouse } 973b1e71b06SSteven Whitehouse 974b1e71b06SSteven Whitehouse static void gfs2_invalidatepage(struct page *page, unsigned long offset) 975b1e71b06SSteven Whitehouse { 976b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); 977b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 978b1e71b06SSteven Whitehouse unsigned long pos = 0; 979b1e71b06SSteven Whitehouse 980b1e71b06SSteven Whitehouse BUG_ON(!PageLocked(page)); 981b1e71b06SSteven Whitehouse if (offset == 0) 982b1e71b06SSteven Whitehouse ClearPageChecked(page); 983b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 984b1e71b06SSteven Whitehouse goto out; 985b1e71b06SSteven Whitehouse 986b1e71b06SSteven Whitehouse bh = head = page_buffers(page); 987b1e71b06SSteven Whitehouse do { 988b1e71b06SSteven Whitehouse if (offset <= pos) 989b1e71b06SSteven Whitehouse gfs2_discard(sdp, bh); 990b1e71b06SSteven Whitehouse pos += bh->b_size; 991b1e71b06SSteven Whitehouse bh = bh->b_this_page; 992b1e71b06SSteven Whitehouse } while (bh != head); 993b1e71b06SSteven Whitehouse out: 994b1e71b06SSteven Whitehouse if (offset == 0) 995b1e71b06SSteven Whitehouse try_to_release_page(page, 0); 996b1e71b06SSteven Whitehouse } 997b1e71b06SSteven Whitehouse 998b1e71b06SSteven Whitehouse /** 999b1e71b06SSteven Whitehouse * gfs2_ok_for_dio - check that dio is valid on this file 1000b1e71b06SSteven Whitehouse * @ip: The inode 1001b1e71b06SSteven Whitehouse * @rw: READ or WRITE 1002b1e71b06SSteven Whitehouse * @offset: The offset at which we are reading or writing 1003b1e71b06SSteven Whitehouse * 1004b1e71b06SSteven Whitehouse * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) 1005b1e71b06SSteven Whitehouse * 1 (to accept the i/o request) 1006b1e71b06SSteven Whitehouse */ 1007b1e71b06SSteven Whitehouse static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset) 1008b1e71b06SSteven Whitehouse { 1009b1e71b06SSteven Whitehouse /* 1010b1e71b06SSteven Whitehouse * Should we return an error here? I can't see that O_DIRECT for 1011b1e71b06SSteven Whitehouse * a stuffed file makes any sense. For now we'll silently fall 1012b1e71b06SSteven Whitehouse * back to buffered I/O 1013b1e71b06SSteven Whitehouse */ 1014b1e71b06SSteven Whitehouse if (gfs2_is_stuffed(ip)) 1015b1e71b06SSteven Whitehouse return 0; 1016b1e71b06SSteven Whitehouse 1017b1e71b06SSteven Whitehouse if (offset >= i_size_read(&ip->i_inode)) 1018b1e71b06SSteven Whitehouse return 0; 1019b1e71b06SSteven Whitehouse return 1; 1020b1e71b06SSteven Whitehouse } 1021b1e71b06SSteven Whitehouse 1022b1e71b06SSteven Whitehouse 1023b1e71b06SSteven Whitehouse 1024b1e71b06SSteven Whitehouse static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, 1025b1e71b06SSteven Whitehouse const struct iovec *iov, loff_t offset, 1026b1e71b06SSteven Whitehouse unsigned long nr_segs) 1027b1e71b06SSteven Whitehouse { 1028b1e71b06SSteven Whitehouse struct file *file = iocb->ki_filp; 1029b1e71b06SSteven Whitehouse struct inode *inode = file->f_mapping->host; 1030b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1031b1e71b06SSteven Whitehouse struct gfs2_holder gh; 1032b1e71b06SSteven Whitehouse int rv; 1033b1e71b06SSteven Whitehouse 1034b1e71b06SSteven Whitehouse /* 1035b1e71b06SSteven Whitehouse * Deferred lock, even if its a write, since we do no allocation 1036b1e71b06SSteven Whitehouse * on this path. All we need change is atime, and this lock mode 1037b1e71b06SSteven Whitehouse * ensures that other nodes have flushed their buffered read caches 1038b1e71b06SSteven Whitehouse * (i.e. their page cache entries for this inode). We do not, 1039b1e71b06SSteven Whitehouse * unfortunately have the option of only flushing a range like 1040b1e71b06SSteven Whitehouse * the VFS does. 1041b1e71b06SSteven Whitehouse */ 1042b1e71b06SSteven Whitehouse gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); 1043b1e71b06SSteven Whitehouse rv = gfs2_glock_nq(&gh); 1044b1e71b06SSteven Whitehouse if (rv) 1045b1e71b06SSteven Whitehouse return rv; 1046b1e71b06SSteven Whitehouse rv = gfs2_ok_for_dio(ip, rw, offset); 1047b1e71b06SSteven Whitehouse if (rv != 1) 1048b1e71b06SSteven Whitehouse goto out; /* dio not valid, fall back to buffered i/o */ 1049b1e71b06SSteven Whitehouse 1050b1e71b06SSteven Whitehouse rv = blockdev_direct_IO_no_locking(rw, iocb, inode, inode->i_sb->s_bdev, 1051b1e71b06SSteven Whitehouse iov, offset, nr_segs, 1052b1e71b06SSteven Whitehouse gfs2_get_block_direct, NULL); 1053b1e71b06SSteven Whitehouse out: 1054b1e71b06SSteven Whitehouse gfs2_glock_dq_m(1, &gh); 1055b1e71b06SSteven Whitehouse gfs2_holder_uninit(&gh); 1056b1e71b06SSteven Whitehouse return rv; 1057b1e71b06SSteven Whitehouse } 1058b1e71b06SSteven Whitehouse 1059b1e71b06SSteven Whitehouse /** 1060b1e71b06SSteven Whitehouse * gfs2_releasepage - free the metadata associated with a page 1061b1e71b06SSteven Whitehouse * @page: the page that's being released 1062b1e71b06SSteven Whitehouse * @gfp_mask: passed from Linux VFS, ignored by us 1063b1e71b06SSteven Whitehouse * 1064b1e71b06SSteven Whitehouse * Call try_to_free_buffers() if the buffers in this page can be 1065b1e71b06SSteven Whitehouse * released. 1066b1e71b06SSteven Whitehouse * 1067b1e71b06SSteven Whitehouse * Returns: 0 1068b1e71b06SSteven Whitehouse */ 1069b1e71b06SSteven Whitehouse 1070b1e71b06SSteven Whitehouse int gfs2_releasepage(struct page *page, gfp_t gfp_mask) 1071b1e71b06SSteven Whitehouse { 1072b1e71b06SSteven Whitehouse struct inode *aspace = page->mapping->host; 1073b1e71b06SSteven Whitehouse struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info; 1074b1e71b06SSteven Whitehouse struct buffer_head *bh, *head; 1075b1e71b06SSteven Whitehouse struct gfs2_bufdata *bd; 1076b1e71b06SSteven Whitehouse 1077b1e71b06SSteven Whitehouse if (!page_has_buffers(page)) 1078b1e71b06SSteven Whitehouse return 0; 1079b1e71b06SSteven Whitehouse 1080b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 1081b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1082b1e71b06SSteven Whitehouse do { 1083b1e71b06SSteven Whitehouse if (atomic_read(&bh->b_count)) 1084b1e71b06SSteven Whitehouse goto cannot_release; 1085b1e71b06SSteven Whitehouse bd = bh->b_private; 1086b1e71b06SSteven Whitehouse if (bd && bd->bd_ail) 1087b1e71b06SSteven Whitehouse goto cannot_release; 1088b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, !buffer_pinned(bh)); 1089b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, !buffer_dirty(bh)); 1090b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1091b1e71b06SSteven Whitehouse } while(bh != head); 1092b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1093b1e71b06SSteven Whitehouse 1094b1e71b06SSteven Whitehouse head = bh = page_buffers(page); 1095b1e71b06SSteven Whitehouse do { 1096b1e71b06SSteven Whitehouse gfs2_log_lock(sdp); 1097b1e71b06SSteven Whitehouse bd = bh->b_private; 1098b1e71b06SSteven Whitehouse if (bd) { 1099b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, bd->bd_bh == bh); 1100b1e71b06SSteven Whitehouse gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr)); 1101b1e71b06SSteven Whitehouse if (!list_empty(&bd->bd_le.le_list)) { 1102b1e71b06SSteven Whitehouse if (!buffer_pinned(bh)) 1103b1e71b06SSteven Whitehouse list_del_init(&bd->bd_le.le_list); 1104b1e71b06SSteven Whitehouse else 1105b1e71b06SSteven Whitehouse bd = NULL; 1106b1e71b06SSteven Whitehouse } 1107b1e71b06SSteven Whitehouse if (bd) 1108b1e71b06SSteven Whitehouse bd->bd_bh = NULL; 1109b1e71b06SSteven Whitehouse bh->b_private = NULL; 1110b1e71b06SSteven Whitehouse } 1111b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1112b1e71b06SSteven Whitehouse if (bd) 1113b1e71b06SSteven Whitehouse kmem_cache_free(gfs2_bufdata_cachep, bd); 1114b1e71b06SSteven Whitehouse 1115b1e71b06SSteven Whitehouse bh = bh->b_this_page; 1116b1e71b06SSteven Whitehouse } while (bh != head); 1117b1e71b06SSteven Whitehouse 1118b1e71b06SSteven Whitehouse return try_to_free_buffers(page); 1119b1e71b06SSteven Whitehouse cannot_release: 1120b1e71b06SSteven Whitehouse gfs2_log_unlock(sdp); 1121b1e71b06SSteven Whitehouse return 0; 1122b1e71b06SSteven Whitehouse } 1123b1e71b06SSteven Whitehouse 1124b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_writeback_aops = { 1125b1e71b06SSteven Whitehouse .writepage = gfs2_writeback_writepage, 1126b1e71b06SSteven Whitehouse .writepages = gfs2_writeback_writepages, 1127b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1128b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1129b1e71b06SSteven Whitehouse .sync_page = block_sync_page, 1130b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1131b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1132b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1133b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1134b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1135b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1136b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1137b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1138b1e71b06SSteven Whitehouse }; 1139b1e71b06SSteven Whitehouse 1140b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_ordered_aops = { 1141b1e71b06SSteven Whitehouse .writepage = gfs2_ordered_writepage, 1142b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1143b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1144b1e71b06SSteven Whitehouse .sync_page = block_sync_page, 1145b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1146b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1147b1e71b06SSteven Whitehouse .set_page_dirty = gfs2_set_page_dirty, 1148b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1149b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1150b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1151b1e71b06SSteven Whitehouse .direct_IO = gfs2_direct_IO, 1152b1e71b06SSteven Whitehouse .migratepage = buffer_migrate_page, 1153b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1154b1e71b06SSteven Whitehouse }; 1155b1e71b06SSteven Whitehouse 1156b1e71b06SSteven Whitehouse static const struct address_space_operations gfs2_jdata_aops = { 1157b1e71b06SSteven Whitehouse .writepage = gfs2_jdata_writepage, 1158b1e71b06SSteven Whitehouse .writepages = gfs2_jdata_writepages, 1159b1e71b06SSteven Whitehouse .readpage = gfs2_readpage, 1160b1e71b06SSteven Whitehouse .readpages = gfs2_readpages, 1161b1e71b06SSteven Whitehouse .sync_page = block_sync_page, 1162b1e71b06SSteven Whitehouse .write_begin = gfs2_write_begin, 1163b1e71b06SSteven Whitehouse .write_end = gfs2_write_end, 1164b1e71b06SSteven Whitehouse .set_page_dirty = gfs2_set_page_dirty, 1165b1e71b06SSteven Whitehouse .bmap = gfs2_bmap, 1166b1e71b06SSteven Whitehouse .invalidatepage = gfs2_invalidatepage, 1167b1e71b06SSteven Whitehouse .releasepage = gfs2_releasepage, 1168b1e71b06SSteven Whitehouse .is_partially_uptodate = block_is_partially_uptodate, 1169b1e71b06SSteven Whitehouse }; 1170b1e71b06SSteven Whitehouse 1171b1e71b06SSteven Whitehouse void gfs2_set_aops(struct inode *inode) 1172b1e71b06SSteven Whitehouse { 1173b1e71b06SSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 1174b1e71b06SSteven Whitehouse 1175b1e71b06SSteven Whitehouse if (gfs2_is_writeback(ip)) 1176b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_writeback_aops; 1177b1e71b06SSteven Whitehouse else if (gfs2_is_ordered(ip)) 1178b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_ordered_aops; 1179b1e71b06SSteven Whitehouse else if (gfs2_is_jdata(ip)) 1180b1e71b06SSteven Whitehouse inode->i_mapping->a_ops = &gfs2_jdata_aops; 1181b1e71b06SSteven Whitehouse else 1182b1e71b06SSteven Whitehouse BUG(); 1183b1e71b06SSteven Whitehouse } 1184b1e71b06SSteven Whitehouse 1185