/* * gcinode.c - dummy inodes to buffer blocks for garbage collection * * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * Written by Seiji Kihara, Amagai Yoshiji, and Ryusuke Konishi. * Revised by Ryusuke Konishi. * */ /* * This file adds the cache of on-disk blocks to be moved in garbage * collection. The disk blocks are held with dummy inodes (called * gcinodes), and this file provides lookup function of the dummy * inodes and their buffer read function. * * Buffers and pages held by the dummy inodes will be released each * time after they are copied to a new log. Dirty blocks made on the * current generation and the blocks to be moved by GC never overlap * because the dirty blocks make a new generation; they rather must be * written individually. */ #include #include #include #include #include #include "nilfs.h" #include "btree.h" #include "btnode.h" #include "page.h" #include "mdt.h" #include "dat.h" #include "ifile.h" /* * nilfs_gccache_submit_read_data() - add data buffer and submit read request * @inode - gc inode * @blkoff - dummy offset treated as the key for the page cache * @pbn - physical block number of the block * @vbn - virtual block number of the block, 0 for non-virtual block * @out_bh - indirect pointer to a buffer_head struct to receive the results * * Description: nilfs_gccache_submit_read_data() registers the data buffer * specified by @pbn to the GC pagecache with the key @blkoff. * This function sets @vbn (@pbn if @vbn is zero) in b_blocknr of the buffer. * * Return Value: On success, 0 is returned. On Error, one of the following * negative error code is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-ENOENT - The block specified with @pbn does not exist. */ int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff, sector_t pbn, __u64 vbn, struct buffer_head **out_bh) { struct buffer_head *bh; int err; bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0); if (unlikely(!bh)) return -ENOMEM; if (buffer_uptodate(bh)) goto out; if (pbn == 0) { struct the_nilfs *nilfs = inode->i_sb->s_fs_info; err = nilfs_dat_translate(nilfs->ns_dat, vbn, &pbn); if (unlikely(err)) { /* -EIO, -ENOMEM, -ENOENT */ brelse(bh); goto failed; } } lock_buffer(bh); if (buffer_uptodate(bh)) { unlock_buffer(bh); goto out; } if (!buffer_mapped(bh)) { bh->b_bdev = inode->i_sb->s_bdev; set_buffer_mapped(bh); } bh->b_blocknr = pbn; bh->b_end_io = end_buffer_read_sync; get_bh(bh); submit_bh(REQ_OP_READ, 0, bh); if (vbn) bh->b_blocknr = vbn; out: err = 0; *out_bh = bh; failed: unlock_page(bh->b_page); put_page(bh->b_page); return err; } /* * nilfs_gccache_submit_read_node() - add node buffer and submit read request * @inode - gc inode * @pbn - physical block number for the block * @vbn - virtual block number for the block * @out_bh - indirect pointer to a buffer_head struct to receive the results * * Description: nilfs_gccache_submit_read_node() registers the node buffer * specified by @vbn to the GC pagecache. @pbn can be supplied by the * caller to avoid translation of the disk block address. * * Return Value: On success, 0 is returned. On Error, one of the following * negative error code is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. */ int nilfs_gccache_submit_read_node(struct inode *inode, sector_t pbn, __u64 vbn, struct buffer_head **out_bh) { int ret; ret = nilfs_btnode_submit_block(&NILFS_I(inode)->i_btnode_cache, vbn ? : pbn, pbn, REQ_OP_READ, 0, out_bh, &pbn); if (ret == -EEXIST) /* internal code (cache hit) */ ret = 0; return ret; } int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *bh) { wait_on_buffer(bh); if (!buffer_uptodate(bh)) { struct inode *inode = bh->b_page->mapping->host; nilfs_msg(inode->i_sb, KERN_ERR, "I/O error reading %s block for GC (ino=%lu, vblocknr=%llu)", buffer_nilfs_node(bh) ? "node" : "data", inode->i_ino, (unsigned long long)bh->b_blocknr); return -EIO; } if (buffer_dirty(bh)) return -EEXIST; if (buffer_nilfs_node(bh) && nilfs_btree_broken_node_block(bh)) { clear_buffer_uptodate(bh); return -EIO; } mark_buffer_dirty(bh); return 0; } int nilfs_init_gcinode(struct inode *inode) { struct nilfs_inode_info *ii = NILFS_I(inode); inode->i_mode = S_IFREG; mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); inode->i_mapping->a_ops = &empty_aops; ii->i_flags = 0; nilfs_bmap_init_gc(ii->i_bmap); return 0; } /** * nilfs_remove_all_gcinodes() - remove all unprocessed gc inodes */ void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs) { struct list_head *head = &nilfs->ns_gc_inodes; struct nilfs_inode_info *ii; while (!list_empty(head)) { ii = list_first_entry(head, struct nilfs_inode_info, i_dirty); list_del_init(&ii->i_dirty); truncate_inode_pages(&ii->vfs_inode.i_data, 0); nilfs_btnode_cache_clear(&ii->i_btnode_cache); iput(&ii->vfs_inode); } } xt.git/tree/net/ipv4/route.c?h=nds-private-remove&id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>net/ipv4/route.c parent24c2503255d35c269b67162c397a1a1c1e02f6ce (diff)
x86/mce: Make timer handling more robust
Erik reported that on a preproduction hardware a CMCI storm triggers the BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is started by the CMCI logic before the MCE CPU hotplug callback starts the timer with add_timer_on(). So the timer is already queued which triggers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'net/ipv4/route.c')