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fs/gfs2/aops.c
29.6 KB
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/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
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* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
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* * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions |
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* of the GNU General Public License version 2. |
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*/ #include <linux/sched.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/completion.h> #include <linux/buffer_head.h> #include <linux/pagemap.h> |
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#include <linux/pagevec.h> |
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#include <linux/mpage.h> |
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#include <linux/fs.h> |
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#include <linux/writeback.h> |
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#include <linux/swap.h> |
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#include <linux/gfs2_ondisk.h> |
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#include <linux/backing-dev.h> |
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#include "gfs2.h" |
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#include "incore.h" |
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#include "bmap.h" #include "glock.h" #include "inode.h" |
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#include "log.h" #include "meta_io.h" |
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#include "quota.h" #include "trans.h" |
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#include "rgrp.h" |
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#include "super.h" |
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#include "util.h" |
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#include "glops.h" |
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void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, unsigned int from, unsigned int to) |
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{ struct buffer_head *head = page_buffers(page); unsigned int bsize = head->b_size; struct buffer_head *bh; unsigned int start, end; for (bh = head, start = 0; bh != head || !start; bh = bh->b_this_page, start = end) { end = start + bsize; if (end <= from || start >= to) continue; |
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if (gfs2_is_jdata(ip)) set_buffer_uptodate(bh); |
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gfs2_trans_add_bh(ip->i_gl, bh, 0); } } |
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/** |
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* gfs2_get_block_noalloc - Fills in a buffer head with details about a block |
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* @inode: The inode * @lblock: The block number to look up * @bh_result: The buffer head to return the result in * @create: Non-zero if we may add block to the file * * Returns: errno */ |
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static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, struct buffer_head *bh_result, int create) |
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{ |
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int error; |
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error = gfs2_block_map(inode, lblock, bh_result, 0); |
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if (error) return error; |
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if (!buffer_mapped(bh_result)) |
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return -EIO; return 0; |
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} |
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static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, struct buffer_head *bh_result, int create) |
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{ |
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return gfs2_block_map(inode, lblock, bh_result, 0); |
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} |
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/** |
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* gfs2_writepage_common - Common bits of writepage * @page: The page to be written * @wbc: The writeback control |
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* |
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* Returns: 1 if writepage is ok, otherwise an error code or zero if no error. |
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*/ |
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static int gfs2_writepage_common(struct page *page, struct writeback_control *wbc) |
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{ |
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struct inode *inode = page->mapping->host; |
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struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); |
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loff_t i_size = i_size_read(inode); pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; unsigned offset; |
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if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) goto out; |
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if (current->journal_info) |
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goto redirty; |
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/* Is the page fully outside i_size? (truncate in progress) */ |
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offset = i_size & (PAGE_CACHE_SIZE-1); |
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if (page->index > end_index || (page->index == end_index && !offset)) { |
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page->mapping->a_ops->invalidatepage(page, 0); |
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goto out; |
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} |
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return 1; redirty: redirty_page_for_writepage(wbc, page); out: unlock_page(page); return 0; } /** * gfs2_writeback_writepage - Write page for writeback mappings * @page: The page * @wbc: The writeback control * */ static int gfs2_writeback_writepage(struct page *page, struct writeback_control *wbc) { int ret; ret = gfs2_writepage_common(page, wbc); if (ret <= 0) return ret; |
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return nobh_writepage(page, gfs2_get_block_noalloc, wbc); |
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} /** * gfs2_ordered_writepage - Write page for ordered data files * @page: The page to write * @wbc: The writeback control * */ static int gfs2_ordered_writepage(struct page *page, struct writeback_control *wbc) { struct inode *inode = page->mapping->host; struct gfs2_inode *ip = GFS2_I(inode); int ret; ret = gfs2_writepage_common(page, wbc); if (ret <= 0) return ret; if (!page_has_buffers(page)) { create_empty_buffers(page, inode->i_sb->s_blocksize, (1 << BH_Dirty)|(1 << BH_Uptodate)); } gfs2_page_add_databufs(ip, page, 0, inode->i_sb->s_blocksize-1); return block_write_full_page(page, gfs2_get_block_noalloc, wbc); } /** |
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* __gfs2_jdata_writepage - The core of jdata writepage * @page: The page to write * @wbc: The writeback control * * This is shared between writepage and writepages and implements the * core of the writepage operation. If a transaction is required then * PageChecked will have been set and the transaction will have * already been started before this is called. */ static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) { struct inode *inode = page->mapping->host; struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); if (PageChecked(page)) { ClearPageChecked(page); if (!page_has_buffers(page)) { create_empty_buffers(page, inode->i_sb->s_blocksize, (1 << BH_Dirty)|(1 << BH_Uptodate)); } gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); } return block_write_full_page(page, gfs2_get_block_noalloc, wbc); } /** |
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* gfs2_jdata_writepage - Write complete page * @page: Page to write * * Returns: errno * */ static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) { struct inode *inode = page->mapping->host; |
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struct gfs2_sbd *sdp = GFS2_SB(inode); |
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int ret; |
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int done_trans = 0; |
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if (PageChecked(page)) { |
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if (wbc->sync_mode != WB_SYNC_ALL) goto out_ignore; |
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ret = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); if (ret) |
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goto out_ignore; |
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done_trans = 1; } |
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ret = gfs2_writepage_common(page, wbc); if (ret > 0) ret = __gfs2_jdata_writepage(page, wbc); |
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if (done_trans) gfs2_trans_end(sdp); |
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return ret; |
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out_ignore: redirty_page_for_writepage(wbc, page); unlock_page(page); return 0; |
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} /** |
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* gfs2_writeback_writepages - Write a bunch of dirty pages back to disk |
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* @mapping: The mapping to write * @wbc: Write-back control * |
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* For the data=writeback case we can already ignore buffer heads |
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* and write whole extents at once. This is a big reduction in the * number of I/O requests we send and the bmap calls we make in this case. */ |
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static int gfs2_writeback_writepages(struct address_space *mapping, struct writeback_control *wbc) |
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{ |
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return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); |
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} /** |
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* gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages * @mapping: The mapping * @wbc: The writeback control * @writepage: The writepage function to call for each page * @pvec: The vector of pages * @nr_pages: The number of pages to write * * Returns: non-zero if loop should terminate, zero otherwise */ static int gfs2_write_jdata_pagevec(struct address_space *mapping, struct writeback_control *wbc, struct pagevec *pvec, int nr_pages, pgoff_t end) { struct inode *inode = mapping->host; struct gfs2_sbd *sdp = GFS2_SB(inode); loff_t i_size = i_size_read(inode); pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; unsigned offset = i_size & (PAGE_CACHE_SIZE-1); unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize); |
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int i; int ret; |
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ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); |
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if (ret < 0) return ret; for(i = 0; i < nr_pages; i++) { struct page *page = pvec->pages[i]; lock_page(page); if (unlikely(page->mapping != mapping)) { unlock_page(page); continue; } if (!wbc->range_cyclic && page->index > end) { ret = 1; unlock_page(page); continue; } if (wbc->sync_mode != WB_SYNC_NONE) wait_on_page_writeback(page); if (PageWriteback(page) || !clear_page_dirty_for_io(page)) { unlock_page(page); continue; } /* Is the page fully outside i_size? (truncate in progress) */ if (page->index > end_index || (page->index == end_index && !offset)) { page->mapping->a_ops->invalidatepage(page, 0); unlock_page(page); continue; } ret = __gfs2_jdata_writepage(page, wbc); if (ret || (--(wbc->nr_to_write) <= 0)) ret = 1; |
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} gfs2_trans_end(sdp); return ret; } /** * gfs2_write_cache_jdata - Like write_cache_pages but different * @mapping: The mapping to write * @wbc: The writeback control * @writepage: The writepage function to call * @data: The data to pass to writepage * * The reason that we use our own function here is that we need to * start transactions before we grab page locks. This allows us * to get the ordering right. */ static int gfs2_write_cache_jdata(struct address_space *mapping, struct writeback_control *wbc) { |
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int ret = 0; int done = 0; struct pagevec pvec; int nr_pages; pgoff_t index; pgoff_t end; int scanned = 0; int range_whole = 0; |
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pagevec_init(&pvec, 0); if (wbc->range_cyclic) { index = mapping->writeback_index; /* Start from prev offset */ end = -1; } else { index = wbc->range_start >> PAGE_CACHE_SHIFT; end = wbc->range_end >> PAGE_CACHE_SHIFT; if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) range_whole = 1; scanned = 1; } retry: while (!done && (index <= end) && (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY, min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { scanned = 1; ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end); if (ret) done = 1; if (ret > 0) ret = 0; pagevec_release(&pvec); cond_resched(); } if (!scanned && !done) { /* * We hit the last page and there is more work to be done: wrap * back to the start of the file */ scanned = 1; index = 0; goto retry; } if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) mapping->writeback_index = index; return ret; } /** * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk * @mapping: The mapping to write * @wbc: The writeback control * */ static int gfs2_jdata_writepages(struct address_space *mapping, struct writeback_control *wbc) { struct gfs2_inode *ip = GFS2_I(mapping->host); struct gfs2_sbd *sdp = GFS2_SB(mapping->host); int ret; ret = gfs2_write_cache_jdata(mapping, wbc); if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { gfs2_log_flush(sdp, ip->i_gl); ret = gfs2_write_cache_jdata(mapping, wbc); } return ret; } /** |
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* stuffed_readpage - Fill in a Linux page with stuffed file data * @ip: the inode * @page: the page * * Returns: errno */ static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) { struct buffer_head *dibh; |
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u64 dsize = i_size_read(&ip->i_inode); |
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void *kaddr; int error; |
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/* |
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* Due to the order of unstuffing files and ->fault(), we can be |
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* asked for a zero page in the case of a stuffed file being extended, * so we need to supply one here. It doesn't happen often. */ if (unlikely(page->index)) { |
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zero_user(page, 0, PAGE_CACHE_SIZE); |
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SetPageUptodate(page); |
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return 0; } |
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error = gfs2_meta_inode_buffer(ip, &dibh); if (error) return error; |
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kaddr = kmap_atomic(page, KM_USER0); |
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if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode))) dsize = (dibh->b_size - sizeof(struct gfs2_dinode)); memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize); |
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kunmap_atomic(kaddr, KM_USER0); |
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flush_dcache_page(page); |
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brelse(dibh); |
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SetPageUptodate(page); return 0; } |
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/** |
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* __gfs2_readpage - readpage * @file: The file to read a page for |
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* @page: The page to read * |
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* This is the core of gfs2's readpage. Its used by the internal file * reading code as in that case we already hold the glock. Also its * called by gfs2_readpage() once the required lock has been granted. * |
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*/ |
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static int __gfs2_readpage(void *file, struct page *page) |
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{ |
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struct gfs2_inode *ip = GFS2_I(page->mapping->host); struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); |
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int error; |
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if (gfs2_is_stuffed(ip)) { |
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error = stuffed_readpage(ip, page); unlock_page(page); |
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} else { |
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error = mpage_readpage(page, gfs2_block_map); |
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} |
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if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
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return -EIO; |
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return error; } /** * gfs2_readpage - read a page of a file * @file: The file to read * @page: The page of the file * |
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* This deals with the locking required. We have to unlock and * relock the page in order to get the locking in the right * order. |
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*/ static int gfs2_readpage(struct file *file, struct page *page) { |
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struct address_space *mapping = page->mapping; struct gfs2_inode *ip = GFS2_I(mapping->host); |
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struct gfs2_holder gh; |
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int error; |
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unlock_page(page); |
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gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); error = gfs2_glock_nq(&gh); |
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if (unlikely(error)) |
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goto out; |
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error = AOP_TRUNCATED_PAGE; lock_page(page); if (page->mapping == mapping && !PageUptodate(page)) error = __gfs2_readpage(file, page); else unlock_page(page); |
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gfs2_glock_dq(&gh); |
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out: |
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gfs2_holder_uninit(&gh); |
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if (error && error != AOP_TRUNCATED_PAGE) lock_page(page); |
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return error; } /** * gfs2_internal_read - read an internal file * @ip: The gfs2 inode * @ra_state: The readahead state (or NULL for no readahead) * @buf: The buffer to fill * @pos: The file position * @size: The amount to read * */ int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, char *buf, loff_t *pos, unsigned size) { struct address_space *mapping = ip->i_inode.i_mapping; unsigned long index = *pos / PAGE_CACHE_SIZE; unsigned offset = *pos & (PAGE_CACHE_SIZE - 1); unsigned copied = 0; unsigned amt; struct page *page; void *p; do { amt = size - copied; if (offset + size > PAGE_CACHE_SIZE) amt = PAGE_CACHE_SIZE - offset; page = read_cache_page(mapping, index, __gfs2_readpage, NULL); if (IS_ERR(page)) return PTR_ERR(page); p = kmap_atomic(page, KM_USER0); memcpy(buf + copied, p + offset, amt); kunmap_atomic(p, KM_USER0); mark_page_accessed(page); page_cache_release(page); copied += amt; index++; offset = 0; } while(copied < size); (*pos) += size; return size; |
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} |
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/** * gfs2_readpages - Read a bunch of pages at once * * Some notes: * 1. This is only for readahead, so we can simply ignore any things * which are slightly inconvenient (such as locking conflicts between * the page lock and the glock) and return having done no I/O. Its * obviously not something we'd want to do on too regular a basis. * Any I/O we ignore at this time will be done via readpage later. |
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* 2. We don't handle stuffed files here we let readpage do the honours. |
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* 3. mpage_readpages() does most of the heavy lifting in the common case. |
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* 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. |
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*/ |
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static int gfs2_readpages(struct file *file, struct address_space *mapping, struct list_head *pages, unsigned nr_pages) { struct inode *inode = mapping->host; |
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struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); |
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struct gfs2_holder gh; |
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int ret; |
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gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); ret = gfs2_glock_nq(&gh); |
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if (unlikely(ret)) |
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|
568 |
goto out_uninit; |
e1d5b18ae
|
569 |
if (!gfs2_is_stuffed(ip)) |
e9e1ef2b6
|
570 |
ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); |
3cc3f710c
|
571 572 573 |
gfs2_glock_dq(&gh); out_uninit: gfs2_holder_uninit(&gh); |
fd88de569
|
574 575 576 |
if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) ret = -EIO; return ret; |
b3b94faa5
|
577 578 579 |
} /** |
7765ec26a
|
580 |
* gfs2_write_begin - Begin to write to a file |
b3b94faa5
|
581 |
* @file: The file to write to |
7765ec26a
|
582 583 584 585 586 587 |
* @mapping: The mapping in which to write * @pos: The file offset at which to start writing * @len: Length of the write * @flags: Various flags * @pagep: Pointer to return the page * @fsdata: Pointer to return fs data (unused by GFS2) |
b3b94faa5
|
588 589 590 |
* * Returns: errno */ |
7765ec26a
|
591 592 593 |
static int gfs2_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) |
b3b94faa5
|
594 |
{ |
7765ec26a
|
595 596 |
struct gfs2_inode *ip = GFS2_I(mapping->host); struct gfs2_sbd *sdp = GFS2_SB(mapping->host); |
1946f70ab
|
597 |
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
7ed122e42
|
598 |
unsigned int data_blocks = 0, ind_blocks = 0, rblocks; |
18ec7d5c3
|
599 |
int alloc_required; |
b3b94faa5
|
600 |
int error = 0; |
564e12b11
|
601 |
struct gfs2_qadata *qa = NULL; |
7765ec26a
|
602 603 |
pgoff_t index = pos >> PAGE_CACHE_SHIFT; unsigned from = pos & (PAGE_CACHE_SIZE - 1); |
7765ec26a
|
604 |
struct page *page; |
52ae7b793
|
605 |
|
719ee3446
|
606 607 |
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); error = gfs2_glock_nq(&ip->i_gh); |
7765ec26a
|
608 |
if (unlikely(error)) |
18ec7d5c3
|
609 |
goto out_uninit; |
1946f70ab
|
610 611 612 613 614 615 616 617 |
if (&ip->i_inode == sdp->sd_rindex) { error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, &m_ip->i_gh); if (unlikely(error)) { gfs2_glock_dq(&ip->i_gh); goto out_uninit; } } |
b3b94faa5
|
618 |
|
461cb419f
|
619 |
alloc_required = gfs2_write_alloc_required(ip, pos, len); |
18ec7d5c3
|
620 |
|
7ed122e42
|
621 622 |
if (alloc_required || gfs2_is_jdata(ip)) gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); |
18ec7d5c3
|
623 |
if (alloc_required) { |
564e12b11
|
624 625 |
qa = gfs2_qadata_get(ip); if (!qa) { |
182fe5abd
|
626 627 628 |
error = -ENOMEM; goto out_unlock; } |
18ec7d5c3
|
629 |
|
d82661d96
|
630 |
error = gfs2_quota_lock_check(ip); |
18ec7d5c3
|
631 632 |
if (error) goto out_alloc_put; |
564e12b11
|
633 |
error = gfs2_inplace_reserve(ip, data_blocks + ind_blocks); |
18ec7d5c3
|
634 635 636 637 638 639 640 641 642 |
if (error) goto out_qunlock; } rblocks = RES_DINODE + ind_blocks; if (gfs2_is_jdata(ip)) rblocks += data_blocks ? data_blocks : 1; if (ind_blocks || data_blocks) rblocks += RES_STATFS + RES_QUOTA; |
1946f70ab
|
643 644 |
if (&ip->i_inode == sdp->sd_rindex) rblocks += 2 * RES_STATFS; |
bf97b6734
|
645 |
if (alloc_required) |
54335b1fc
|
646 |
rblocks += gfs2_rg_blocks(ip); |
18ec7d5c3
|
647 |
|
16615be18
|
648 649 |
error = gfs2_trans_begin(sdp, rblocks, PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); |
18ec7d5c3
|
650 |
if (error) |
a867bb28c
|
651 |
goto out_trans_fail; |
18ec7d5c3
|
652 |
|
c41d4f09f
|
653 |
error = -ENOMEM; |
e4fefbac6
|
654 |
flags |= AOP_FLAG_NOFS; |
54566b2c1
|
655 |
page = grab_cache_page_write_begin(mapping, index, flags); |
c41d4f09f
|
656 657 658 |
*pagep = page; if (unlikely(!page)) goto out_endtrans; |
18ec7d5c3
|
659 |
if (gfs2_is_stuffed(ip)) { |
c41d4f09f
|
660 |
error = 0; |
7765ec26a
|
661 |
if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { |
f25ef0c1b
|
662 |
error = gfs2_unstuff_dinode(ip, page); |
5c4e9e036
|
663 664 |
if (error == 0) goto prepare_write; |
c41d4f09f
|
665 |
} else if (!PageUptodate(page)) { |
b3b94faa5
|
666 |
error = stuffed_readpage(ip, page); |
c41d4f09f
|
667 |
} |
5c4e9e036
|
668 |
goto out; |
18ec7d5c3
|
669 |
} |
5c4e9e036
|
670 |
prepare_write: |
ebdec241d
|
671 |
error = __block_write_begin(page, from, len, gfs2_block_map); |
18ec7d5c3
|
672 |
out: |
c41d4f09f
|
673 674 |
if (error == 0) return 0; |
6c474f7bc
|
675 |
unlock_page(page); |
c41d4f09f
|
676 |
page_cache_release(page); |
15c6fd978
|
677 |
|
ff8f33c8b
|
678 |
gfs2_trans_end(sdp); |
c41d4f09f
|
679 |
if (pos + len > ip->i_inode.i_size) |
ff8f33c8b
|
680 681 |
gfs2_trim_blocks(&ip->i_inode); goto out_trans_fail; |
c41d4f09f
|
682 683 |
out_endtrans: gfs2_trans_end(sdp); |
a867bb28c
|
684 |
out_trans_fail: |
c41d4f09f
|
685 686 |
if (alloc_required) { gfs2_inplace_release(ip); |
18ec7d5c3
|
687 |
out_qunlock: |
c41d4f09f
|
688 |
gfs2_quota_unlock(ip); |
18ec7d5c3
|
689 |
out_alloc_put: |
564e12b11
|
690 |
gfs2_qadata_put(ip); |
c41d4f09f
|
691 |
} |
18ec7d5c3
|
692 |
out_unlock: |
1946f70ab
|
693 694 695 696 |
if (&ip->i_inode == sdp->sd_rindex) { gfs2_glock_dq(&m_ip->i_gh); gfs2_holder_uninit(&m_ip->i_gh); } |
c41d4f09f
|
697 |
gfs2_glock_dq(&ip->i_gh); |
18ec7d5c3
|
698 |
out_uninit: |
c41d4f09f
|
699 |
gfs2_holder_uninit(&ip->i_gh); |
b3b94faa5
|
700 701 702 703 |
return error; } /** |
7ae8fa845
|
704 705 706 707 708 709 |
* adjust_fs_space - Adjusts the free space available due to gfs2_grow * @inode: the rindex inode */ static void adjust_fs_space(struct inode *inode) { struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
1946f70ab
|
710 711 |
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); |
7ae8fa845
|
712 713 |
struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; |
1946f70ab
|
714 |
struct buffer_head *m_bh, *l_bh; |
7ae8fa845
|
715 716 717 718 |
u64 fs_total, new_free; /* Total up the file system space, according to the latest rindex. */ fs_total = gfs2_ri_total(sdp); |
1946f70ab
|
719 720 |
if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) return; |
7ae8fa845
|
721 722 |
spin_lock(&sdp->sd_statfs_spin); |
1946f70ab
|
723 724 |
gfs2_statfs_change_in(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); |
7ae8fa845
|
725 726 727 728 729 |
if (fs_total > (m_sc->sc_total + l_sc->sc_total)) new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); else new_free = 0; spin_unlock(&sdp->sd_statfs_spin); |
6c53267f0
|
730 731 732 |
fs_warn(sdp, "File system extended by %llu blocks. ", (unsigned long long)new_free); |
7ae8fa845
|
733 |
gfs2_statfs_change(sdp, new_free, new_free, 0); |
1946f70ab
|
734 735 736 737 738 739 740 |
if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) goto out; update_statfs(sdp, m_bh, l_bh); brelse(l_bh); out: brelse(m_bh); |
7ae8fa845
|
741 742 743 |
} /** |
7765ec26a
|
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 |
* gfs2_stuffed_write_end - Write end for stuffed files * @inode: The inode * @dibh: The buffer_head containing the on-disk inode * @pos: The file position * @len: The length of the write * @copied: How much was actually copied by the VFS * @page: The page * * This copies the data from the page into the inode block after * the inode data structure itself. * * Returns: errno */ static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, loff_t pos, unsigned len, unsigned copied, struct page *page) { struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); |
1946f70ab
|
763 |
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
7765ec26a
|
764 765 766 |
u64 to = pos + copied; void *kaddr; unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); |
7765ec26a
|
767 768 769 770 771 772 773 774 775 776 777 778 |
BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode))); kaddr = kmap_atomic(page, KM_USER0); memcpy(buf + pos, kaddr + pos, copied); memset(kaddr + pos + copied, 0, len - copied); flush_dcache_page(page); kunmap_atomic(kaddr, KM_USER0); if (!PageUptodate(page)) SetPageUptodate(page); unlock_page(page); page_cache_release(page); |
7537d81aa
|
779 |
if (copied) { |
a2e0f7993
|
780 |
if (inode->i_size < to) |
7537d81aa
|
781 |
i_size_write(inode, to); |
7765ec26a
|
782 783 |
mark_inode_dirty(inode); } |
9ae3c6de6
|
784 |
if (inode == sdp->sd_rindex) { |
7765ec26a
|
785 |
adjust_fs_space(inode); |
9ae3c6de6
|
786 787 |
ip->i_gh.gh_flags |= GL_NOCACHE; } |
7765ec26a
|
788 789 790 |
brelse(dibh); gfs2_trans_end(sdp); |
1946f70ab
|
791 792 793 794 |
if (inode == sdp->sd_rindex) { gfs2_glock_dq(&m_ip->i_gh); gfs2_holder_uninit(&m_ip->i_gh); } |
7765ec26a
|
795 796 797 798 799 800 801 |
gfs2_glock_dq(&ip->i_gh); gfs2_holder_uninit(&ip->i_gh); return copied; } /** * gfs2_write_end |
b3b94faa5
|
802 |
* @file: The file to write to |
7765ec26a
|
803 804 805 806 807 808 809 810 811 812 |
* @mapping: The address space to write to * @pos: The file position * @len: The length of the data * @copied: * @page: The page that has been written * @fsdata: The fsdata (unused in GFS2) * * The main write_end function for GFS2. We have a separate one for * stuffed files as they are slightly different, otherwise we just * put our locking around the VFS provided functions. |
b3b94faa5
|
813 814 815 |
* * Returns: errno */ |
7765ec26a
|
816 817 818 |
static int gfs2_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) |
b3b94faa5
|
819 820 |
{ struct inode *inode = page->mapping->host; |
feaa7bba0
|
821 822 |
struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); |
1946f70ab
|
823 |
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
18ec7d5c3
|
824 |
struct buffer_head *dibh; |
564e12b11
|
825 |
struct gfs2_qadata *qa = ip->i_qadata; |
7765ec26a
|
826 827 828 |
unsigned int from = pos & (PAGE_CACHE_SIZE - 1); unsigned int to = from + len; int ret; |
b3b94faa5
|
829 |
|
7afd88d91
|
830 |
BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); |
18ec7d5c3
|
831 |
|
7765ec26a
|
832 833 834 835 836 837 |
ret = gfs2_meta_inode_buffer(ip, &dibh); if (unlikely(ret)) { unlock_page(page); page_cache_release(page); goto failed; } |
18ec7d5c3
|
838 839 |
gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa5
|
840 |
|
7765ec26a
|
841 842 |
if (gfs2_is_stuffed(ip)) return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); |
b3b94faa5
|
843 |
|
bf36a7131
|
844 |
if (!gfs2_is_writeback(ip)) |
7765ec26a
|
845 |
gfs2_page_add_databufs(ip, page, from, to); |
b3b94faa5
|
846 |
|
7765ec26a
|
847 |
ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
48516ced2
|
848 |
|
9ae3c6de6
|
849 |
if (inode == sdp->sd_rindex) { |
7ae8fa845
|
850 |
adjust_fs_space(inode); |
9ae3c6de6
|
851 852 |
ip->i_gh.gh_flags |= GL_NOCACHE; } |
7ae8fa845
|
853 |
|
18ec7d5c3
|
854 |
brelse(dibh); |
7765ec26a
|
855 |
failed: |
deab72d37
|
856 |
gfs2_trans_end(sdp); |
564e12b11
|
857 |
if (ip->i_res) |
18ec7d5c3
|
858 |
gfs2_inplace_release(ip); |
564e12b11
|
859 |
if (qa) { |
18ec7d5c3
|
860 |
gfs2_quota_unlock(ip); |
564e12b11
|
861 |
gfs2_qadata_put(ip); |
18ec7d5c3
|
862 |
} |
1946f70ab
|
863 864 865 866 |
if (inode == sdp->sd_rindex) { gfs2_glock_dq(&m_ip->i_gh); gfs2_holder_uninit(&m_ip->i_gh); } |
7765ec26a
|
867 |
gfs2_glock_dq(&ip->i_gh); |
18ec7d5c3
|
868 |
gfs2_holder_uninit(&ip->i_gh); |
7765ec26a
|
869 |
return ret; |
b3b94faa5
|
870 871 872 |
} /** |
8fb68595d
|
873 874 875 876 877 878 879 880 |
* gfs2_set_page_dirty - Page dirtying function * @page: The page to dirty * * Returns: 1 if it dirtyed the page, or 0 otherwise */ static int gfs2_set_page_dirty(struct page *page) { |
5561093e2
|
881 |
SetPageChecked(page); |
8fb68595d
|
882 883 884 885 |
return __set_page_dirty_buffers(page); } /** |
b3b94faa5
|
886 887 888 889 890 891 892 893 894 |
* gfs2_bmap - Block map function * @mapping: Address space info * @lblock: The block to map * * Returns: The disk address for the block or 0 on hole or error */ static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) { |
feaa7bba0
|
895 |
struct gfs2_inode *ip = GFS2_I(mapping->host); |
b3b94faa5
|
896 897 898 |
struct gfs2_holder i_gh; sector_t dblock = 0; int error; |
b3b94faa5
|
899 900 901 902 903 |
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); if (error) return 0; if (!gfs2_is_stuffed(ip)) |
e9e1ef2b6
|
904 |
dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); |
b3b94faa5
|
905 906 907 908 909 |
gfs2_glock_dq_uninit(&i_gh); return dblock; } |
d7b616e25
|
910 911 912 913 914 915 916 917 918 |
static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) { struct gfs2_bufdata *bd; lock_buffer(bh); gfs2_log_lock(sdp); clear_buffer_dirty(bh); bd = bh->b_private; if (bd) { |
16615be18
|
919 920 921 922 |
if (!list_empty(&bd->bd_le.le_list) && !buffer_pinned(bh)) list_del_init(&bd->bd_le.le_list); else gfs2_remove_from_journal(bh, current->journal_info, 0); |
d7b616e25
|
923 924 925 926 927 928 929 930 |
} bh->b_bdev = NULL; clear_buffer_mapped(bh); clear_buffer_req(bh); clear_buffer_new(bh); gfs2_log_unlock(sdp); unlock_buffer(bh); } |
8628de058
|
931 |
static void gfs2_invalidatepage(struct page *page, unsigned long offset) |
b3b94faa5
|
932 |
{ |
d7b616e25
|
933 934 935 |
struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); struct buffer_head *bh, *head; unsigned long pos = 0; |
b3b94faa5
|
936 |
BUG_ON(!PageLocked(page)); |
8fb68595d
|
937 938 |
if (offset == 0) ClearPageChecked(page); |
d7b616e25
|
939 940 |
if (!page_has_buffers(page)) goto out; |
b3b94faa5
|
941 |
|
d7b616e25
|
942 943 944 945 946 947 948 949 950 951 |
bh = head = page_buffers(page); do { if (offset <= pos) gfs2_discard(sdp, bh); pos += bh->b_size; bh = bh->b_this_page; } while (bh != head); out: if (offset == 0) try_to_release_page(page, 0); |
b3b94faa5
|
952 |
} |
c7b338343
|
953 954 955 956 957 958 959 960 961 962 963 964 965 |
/** * gfs2_ok_for_dio - check that dio is valid on this file * @ip: The inode * @rw: READ or WRITE * @offset: The offset at which we are reading or writing * * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) * 1 (to accept the i/o request) */ static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset) { /* * Should we return an error here? I can't see that O_DIRECT for |
5561093e2
|
966 967 |
* a stuffed file makes any sense. For now we'll silently fall * back to buffered I/O |
c7b338343
|
968 |
*/ |
c7b338343
|
969 970 |
if (gfs2_is_stuffed(ip)) return 0; |
acb57a365
|
971 |
if (offset >= i_size_read(&ip->i_inode)) |
c7b338343
|
972 973 974 |
return 0; return 1; } |
a9e5f4d07
|
975 976 977 |
static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_t offset, unsigned long nr_segs) |
d1665e414
|
978 979 980 |
{ struct file *file = iocb->ki_filp; struct inode *inode = file->f_mapping->host; |
feaa7bba0
|
981 |
struct gfs2_inode *ip = GFS2_I(inode); |
d1665e414
|
982 983 984 985 |
struct gfs2_holder gh; int rv; /* |
c7b338343
|
986 987 988 989 990 991 |
* Deferred lock, even if its a write, since we do no allocation * on this path. All we need change is atime, and this lock mode * ensures that other nodes have flushed their buffered read caches * (i.e. their page cache entries for this inode). We do not, * unfortunately have the option of only flushing a range like * the VFS does. |
d1665e414
|
992 |
*/ |
719ee3446
|
993 994 |
gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); rv = gfs2_glock_nq(&gh); |
d1665e414
|
995 |
if (rv) |
c7b338343
|
996 997 998 999 |
return rv; rv = gfs2_ok_for_dio(ip, rw, offset); if (rv != 1) goto out; /* dio not valid, fall back to buffered i/o */ |
eafdc7d19
|
1000 1001 1002 |
rv = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, offset, nr_segs, gfs2_get_block_direct, NULL, NULL, 0); |
d1665e414
|
1003 1004 1005 |
out: gfs2_glock_dq_m(1, &gh); gfs2_holder_uninit(&gh); |
d1665e414
|
1006 1007 1008 1009 |
return rv; } /** |
623d93555
|
1010 |
* gfs2_releasepage - free the metadata associated with a page |
4340fe625
|
1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 |
* @page: the page that's being released * @gfp_mask: passed from Linux VFS, ignored by us * * Call try_to_free_buffers() if the buffers in this page can be * released. * * Returns: 0 */ int gfs2_releasepage(struct page *page, gfp_t gfp_mask) { |
009d85183
|
1022 1023 |
struct address_space *mapping = page->mapping; struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); |
4340fe625
|
1024 1025 |
struct buffer_head *bh, *head; struct gfs2_bufdata *bd; |
4340fe625
|
1026 1027 |
if (!page_has_buffers(page)) |
891ba6d4a
|
1028 |
return 0; |
4340fe625
|
1029 |
|
bb3b0e3df
|
1030 |
gfs2_log_lock(sdp); |
380f7c65a
|
1031 |
spin_lock(&sdp->sd_ail_lock); |
4340fe625
|
1032 1033 |
head = bh = page_buffers(page); do { |
bb3b0e3df
|
1034 1035 1036 1037 1038 |
if (atomic_read(&bh->b_count)) goto cannot_release; bd = bh->b_private; if (bd && bd->bd_ail) goto cannot_release; |
8f065d365
|
1039 1040 |
if (buffer_pinned(bh) || buffer_dirty(bh)) goto not_possible; |
bb3b0e3df
|
1041 1042 |
bh = bh->b_this_page; } while(bh != head); |
380f7c65a
|
1043 |
spin_unlock(&sdp->sd_ail_lock); |
bb3b0e3df
|
1044 |
gfs2_log_unlock(sdp); |
4340fe625
|
1045 |
|
bb3b0e3df
|
1046 1047 |
head = bh = page_buffers(page); do { |
623d93555
|
1048 |
gfs2_log_lock(sdp); |
4340fe625
|
1049 1050 1051 1052 |
bd = bh->b_private; if (bd) { gfs2_assert_warn(sdp, bd->bd_bh == bh); gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr)); |
d7b616e25
|
1053 1054 1055 1056 1057 1058 1059 1060 |
if (!list_empty(&bd->bd_le.le_list)) { if (!buffer_pinned(bh)) list_del_init(&bd->bd_le.le_list); else bd = NULL; } if (bd) bd->bd_bh = NULL; |
4340fe625
|
1061 1062 |
bh->b_private = NULL; } |
623d93555
|
1063 1064 1065 |
gfs2_log_unlock(sdp); if (bd) kmem_cache_free(gfs2_bufdata_cachep, bd); |
4340fe625
|
1066 1067 |
bh = bh->b_this_page; |
166afccd7
|
1068 |
} while (bh != head); |
4340fe625
|
1069 |
|
4340fe625
|
1070 |
return try_to_free_buffers(page); |
8f065d365
|
1071 1072 1073 1074 |
not_possible: /* Should never happen */ WARN_ON(buffer_dirty(bh)); WARN_ON(buffer_pinned(bh)); |
bb3b0e3df
|
1075 |
cannot_release: |
380f7c65a
|
1076 |
spin_unlock(&sdp->sd_ail_lock); |
bb3b0e3df
|
1077 1078 |
gfs2_log_unlock(sdp); return 0; |
4340fe625
|
1079 |
} |
5561093e2
|
1080 |
static const struct address_space_operations gfs2_writeback_aops = { |
9ff8ec32e
|
1081 |
.writepage = gfs2_writeback_writepage, |
5561093e2
|
1082 1083 1084 |
.writepages = gfs2_writeback_writepages, .readpage = gfs2_readpage, .readpages = gfs2_readpages, |
5561093e2
|
1085 1086 1087 1088 1089 1090 |
.write_begin = gfs2_write_begin, .write_end = gfs2_write_end, .bmap = gfs2_bmap, .invalidatepage = gfs2_invalidatepage, .releasepage = gfs2_releasepage, .direct_IO = gfs2_direct_IO, |
e5d9dc278
|
1091 |
.migratepage = buffer_migrate_page, |
229615def
|
1092 |
.is_partially_uptodate = block_is_partially_uptodate, |
aa261f549
|
1093 |
.error_remove_page = generic_error_remove_page, |
5561093e2
|
1094 1095 1096 |
}; static const struct address_space_operations gfs2_ordered_aops = { |
9ff8ec32e
|
1097 |
.writepage = gfs2_ordered_writepage, |
b3b94faa5
|
1098 |
.readpage = gfs2_readpage, |
fd88de569
|
1099 |
.readpages = gfs2_readpages, |
7765ec26a
|
1100 1101 |
.write_begin = gfs2_write_begin, .write_end = gfs2_write_end, |
8fb68595d
|
1102 |
.set_page_dirty = gfs2_set_page_dirty, |
b3b94faa5
|
1103 1104 |
.bmap = gfs2_bmap, .invalidatepage = gfs2_invalidatepage, |
4340fe625
|
1105 |
.releasepage = gfs2_releasepage, |
b3b94faa5
|
1106 |
.direct_IO = gfs2_direct_IO, |
e5d9dc278
|
1107 |
.migratepage = buffer_migrate_page, |
229615def
|
1108 |
.is_partially_uptodate = block_is_partially_uptodate, |
aa261f549
|
1109 |
.error_remove_page = generic_error_remove_page, |
b3b94faa5
|
1110 |
}; |
5561093e2
|
1111 |
static const struct address_space_operations gfs2_jdata_aops = { |
9ff8ec32e
|
1112 |
.writepage = gfs2_jdata_writepage, |
b8e7cbb65
|
1113 |
.writepages = gfs2_jdata_writepages, |
5561093e2
|
1114 1115 |
.readpage = gfs2_readpage, .readpages = gfs2_readpages, |
5561093e2
|
1116 1117 1118 1119 1120 1121 |
.write_begin = gfs2_write_begin, .write_end = gfs2_write_end, .set_page_dirty = gfs2_set_page_dirty, .bmap = gfs2_bmap, .invalidatepage = gfs2_invalidatepage, .releasepage = gfs2_releasepage, |
229615def
|
1122 |
.is_partially_uptodate = block_is_partially_uptodate, |
aa261f549
|
1123 |
.error_remove_page = generic_error_remove_page, |
5561093e2
|
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 |
}; void gfs2_set_aops(struct inode *inode) { struct gfs2_inode *ip = GFS2_I(inode); if (gfs2_is_writeback(ip)) inode->i_mapping->a_ops = &gfs2_writeback_aops; else if (gfs2_is_ordered(ip)) inode->i_mapping->a_ops = &gfs2_ordered_aops; else if (gfs2_is_jdata(ip)) inode->i_mapping->a_ops = &gfs2_jdata_aops; else BUG(); } |