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[GFS2] Clean up invalidatepage/releasepage
This patch fixes some bugs relating to journaled data files by cleaning up the gfs2_invalidatepage() and gfs2_releasepage() functions. We now never block during gfs2_releasepage(), instead we always either release or refuse to release depending on the status of the buffers. This fixes Red Hat bugzillas #248969 and #252392. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Cc: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Steven Whitehouse
parent
2d9a4bbf6d
commit
bb3b0e3df5
@ -156,9 +156,11 @@ static void inode_go_sync(struct gfs2_glock *gl)
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ip = NULL;
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if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
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if (ip)
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if (ip && !gfs2_is_jdata(ip))
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filemap_fdatawrite(ip->i_inode.i_mapping);
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gfs2_log_flush(gl->gl_sbd, gl);
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if (ip && gfs2_is_jdata(ip))
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filemap_fdatawrite(ip->i_inode.i_mapping);
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gfs2_meta_sync(gl);
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if (ip) {
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struct address_space *mapping = ip->i_inode.i_mapping;
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@ -229,8 +229,10 @@ static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
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list_del(&bd->bd_ail_st_list);
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list_del(&bd->bd_ail_gl_list);
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atomic_dec(&bd->bd_gl->gl_ail_count);
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bh_ip = GFS2_I(bd->bd_bh->b_page->mapping->host);
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gfs2_meta_cache_flush(bh_ip);
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if (bd->bd_bh->b_page->mapping) {
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bh_ip = GFS2_I(bd->bd_bh->b_page->mapping->host);
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gfs2_meta_cache_flush(bh_ip);
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}
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brelse(bd->bd_bh);
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}
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}
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@ -616,58 +616,13 @@ static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
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return dblock;
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}
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static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh)
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{
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struct gfs2_bufdata *bd;
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gfs2_log_lock(sdp);
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bd = bh->b_private;
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if (bd) {
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bd->bd_bh = NULL;
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bh->b_private = NULL;
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if (!bd->bd_ail && list_empty(&bd->bd_le.le_list))
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kmem_cache_free(gfs2_bufdata_cachep, bd);
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}
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gfs2_log_unlock(sdp);
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lock_buffer(bh);
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clear_buffer_dirty(bh);
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bh->b_bdev = NULL;
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clear_buffer_mapped(bh);
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clear_buffer_req(bh);
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clear_buffer_new(bh);
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clear_buffer_delay(bh);
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unlock_buffer(bh);
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}
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static void gfs2_invalidatepage(struct page *page, unsigned long offset)
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{
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struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
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struct buffer_head *head, *bh, *next;
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unsigned int curr_off = 0;
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BUG_ON(!PageLocked(page));
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if (offset == 0)
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ClearPageChecked(page);
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if (!page_has_buffers(page))
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return;
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bh = head = page_buffers(page);
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do {
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unsigned int next_off = curr_off + bh->b_size;
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next = bh->b_this_page;
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if (offset <= curr_off)
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discard_buffer(sdp, bh);
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curr_off = next_off;
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bh = next;
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} while (bh != head);
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if (!offset)
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try_to_release_page(page, 0);
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return;
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block_invalidatepage(page, offset);
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}
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/**
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@ -735,59 +690,6 @@ out:
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return rv;
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}
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/**
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* stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out.
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* @bh: the buffer we're stuck on
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*
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*/
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static void stuck_releasepage(struct buffer_head *bh)
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{
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struct inode *inode = bh->b_page->mapping->host;
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struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
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struct gfs2_bufdata *bd = bh->b_private;
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struct gfs2_glock *gl;
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static unsigned limit = 0;
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if (limit > 3)
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return;
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limit++;
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fs_warn(sdp, "stuck in gfs2_releasepage() %p\n", inode);
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fs_warn(sdp, "blkno = %llu, bh->b_count = %d\n",
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(unsigned long long)bh->b_blocknr, atomic_read(&bh->b_count));
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fs_warn(sdp, "pinned = %u\n", buffer_pinned(bh));
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fs_warn(sdp, "bh->b_private = %s\n", (bd) ? "!NULL" : "NULL");
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if (!bd)
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return;
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gl = bd->bd_gl;
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fs_warn(sdp, "gl = (%u, %llu)\n",
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gl->gl_name.ln_type, (unsigned long long)gl->gl_name.ln_number);
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fs_warn(sdp, "bd_list_tr = %s, bd_le.le_list = %s\n",
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(list_empty(&bd->bd_list_tr)) ? "no" : "yes",
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(list_empty(&bd->bd_le.le_list)) ? "no" : "yes");
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if (gl->gl_ops == &gfs2_inode_glops) {
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struct gfs2_inode *ip = gl->gl_object;
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unsigned int x;
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if (!ip)
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return;
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fs_warn(sdp, "ip = %llu %llu\n",
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(unsigned long long)ip->i_no_formal_ino,
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(unsigned long long)ip->i_no_addr);
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for (x = 0; x < GFS2_MAX_META_HEIGHT; x++)
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fs_warn(sdp, "ip->i_cache[%u] = %s\n",
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x, (ip->i_cache[x]) ? "!NULL" : "NULL");
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}
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}
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/**
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* gfs2_releasepage - free the metadata associated with a page
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* @page: the page that's being released
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@ -805,38 +707,31 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
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struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info;
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struct buffer_head *bh, *head;
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struct gfs2_bufdata *bd;
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unsigned long t = jiffies + gfs2_tune_get(sdp, gt_stall_secs) * HZ;
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if (!page_has_buffers(page))
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goto out;
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gfs2_log_lock(sdp);
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head = bh = page_buffers(page);
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do {
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while (atomic_read(&bh->b_count)) {
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if (!atomic_read(&aspace->i_writecount))
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return 0;
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if (!(gfp_mask & __GFP_WAIT))
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return 0;
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if (time_after_eq(jiffies, t)) {
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stuck_releasepage(bh);
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/* should we withdraw here? */
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return 0;
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}
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yield();
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}
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if (atomic_read(&bh->b_count))
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goto cannot_release;
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bd = bh->b_private;
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if (bd && bd->bd_ail)
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goto cannot_release;
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gfs2_assert_warn(sdp, !buffer_pinned(bh));
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gfs2_assert_warn(sdp, !buffer_dirty(bh));
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bh = bh->b_this_page;
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} while(bh != head);
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gfs2_log_unlock(sdp);
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head = bh = page_buffers(page);
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do {
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gfs2_log_lock(sdp);
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bd = bh->b_private;
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if (bd) {
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gfs2_assert_warn(sdp, bd->bd_bh == bh);
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gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr));
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gfs2_assert_warn(sdp, !bd->bd_ail);
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bd->bd_bh = NULL;
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if (!list_empty(&bd->bd_le.le_list))
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bd = NULL;
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@ -851,6 +746,9 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
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out:
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return try_to_free_buffers(page);
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cannot_release:
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gfs2_log_unlock(sdp);
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return 0;
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}
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const struct address_space_operations gfs2_file_aops = {
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@ -35,6 +35,7 @@
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#include "super.h"
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#include "sys.h"
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#include "util.h"
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#include "log.h"
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#define DO 0
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#define UNDO 1
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@ -887,6 +888,7 @@ error:
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static void gfs2_kill_sb(struct super_block *sb)
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{
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gfs2_delete_debugfs_file(sb->s_fs_info);
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gfs2_meta_syncfs(sb->s_fs_info);
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kill_block_super(sb);
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}
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