8341897882
The extent map code was ripped out earlier because of an inability to deal with holes. This patch adds back a simpler caching scheme requiring far less code. Our old extent map caching was designed back when meta data block caching in Ocfs2 didn't work very well, resulting in many disk reads. These days our metadata caching is much better, resulting in no un-necessary disk reads. As a result, extent caching doesn't have to be as fancy, nor does it have to cache as many extents. Keeping the last 3 extents seen should be sufficient to give us a small performance boost on some streaming workloads. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
153 lines
5 KiB
C
153 lines
5 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* inode.h
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*
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* Function prototypes
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*
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef OCFS2_INODE_H
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#define OCFS2_INODE_H
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#include "extent_map.h"
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/* OCFS2 Inode Private Data */
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struct ocfs2_inode_info
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{
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u64 ip_blkno;
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struct ocfs2_lock_res ip_rw_lockres;
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struct ocfs2_lock_res ip_meta_lockres;
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struct ocfs2_lock_res ip_data_lockres;
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struct ocfs2_lock_res ip_open_lockres;
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/* protects allocation changes on this inode. */
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struct rw_semaphore ip_alloc_sem;
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/* These fields are protected by ip_lock */
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spinlock_t ip_lock;
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u32 ip_open_count;
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u32 ip_clusters;
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struct list_head ip_io_markers;
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struct mutex ip_io_mutex;
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u32 ip_flags; /* see below */
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u32 ip_attr; /* inode attributes */
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/* protected by recovery_lock. */
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struct inode *ip_next_orphan;
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u32 ip_dir_start_lookup;
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/* next two are protected by trans_inc_lock */
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/* which transaction were we created on? Zero if none. */
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unsigned long ip_created_trans;
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/* last transaction we were a part of. */
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unsigned long ip_last_trans;
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struct ocfs2_caching_info ip_metadata_cache;
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struct ocfs2_extent_map ip_extent_map;
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struct inode vfs_inode;
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};
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/*
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* Flags for the ip_flags field
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*/
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/* System file inodes */
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#define OCFS2_INODE_SYSTEM_FILE 0x00000001
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#define OCFS2_INODE_JOURNAL 0x00000002
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#define OCFS2_INODE_BITMAP 0x00000004
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/* This inode has been wiped from disk */
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#define OCFS2_INODE_DELETED 0x00000008
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/* Another node is deleting, so our delete is a nop */
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#define OCFS2_INODE_SKIP_DELETE 0x00000010
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/* Has the inode been orphaned on another node?
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*
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* This hints to ocfs2_drop_inode that it should clear i_nlink before
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* continuing.
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*
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* We *only* set this on unlink vote from another node. If the inode
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* was locally orphaned, then we're sure of the state and don't need
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* to twiddle i_nlink later - it's either zero or not depending on
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* whether our unlink succeeded. Otherwise we got this from a node
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* whose intention was to orphan the inode, however he may have
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* crashed, failed etc, so we let ocfs2_drop_inode zero the value and
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* rely on ocfs2_delete_inode to sort things out under the proper
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* cluster locks.
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*/
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#define OCFS2_INODE_MAYBE_ORPHANED 0x00000020
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/* Does someone have the file open O_DIRECT */
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#define OCFS2_INODE_OPEN_DIRECT 0x00000040
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/* Indicates that the metadata cache should be used as an array. */
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#define OCFS2_INODE_CACHE_INLINE 0x00000080
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static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
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{
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return container_of(inode, struct ocfs2_inode_info, vfs_inode);
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}
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#define INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags & OCFS2_INODE_JOURNAL)
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#define SET_INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags |= OCFS2_INODE_JOURNAL)
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extern struct kmem_cache *ocfs2_inode_cache;
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extern const struct address_space_operations ocfs2_aops;
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struct buffer_head *ocfs2_bread(struct inode *inode, int block,
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int *err, int reada);
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void ocfs2_clear_inode(struct inode *inode);
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void ocfs2_delete_inode(struct inode *inode);
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void ocfs2_drop_inode(struct inode *inode);
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/* Flags for ocfs2_iget() */
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#define OCFS2_FI_FLAG_SYSFILE 0x4
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#define OCFS2_FI_FLAG_ORPHAN_RECOVERY 0x8
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struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, int flags);
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int ocfs2_inode_init_private(struct inode *inode);
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int ocfs2_inode_revalidate(struct dentry *dentry);
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int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
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int create_ino);
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void ocfs2_read_inode(struct inode *inode);
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void ocfs2_read_inode2(struct inode *inode, void *opaque);
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ssize_t ocfs2_rw_direct(int rw, struct file *filp, char *buf,
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size_t size, loff_t *offp);
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void ocfs2_sync_blockdev(struct super_block *sb);
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void ocfs2_refresh_inode(struct inode *inode,
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struct ocfs2_dinode *fe);
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int ocfs2_mark_inode_dirty(handle_t *handle,
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struct inode *inode,
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struct buffer_head *bh);
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int ocfs2_aio_read(struct file *file, struct kiocb *req, struct iocb *iocb);
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int ocfs2_aio_write(struct file *file, struct kiocb *req, struct iocb *iocb);
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void ocfs2_set_inode_flags(struct inode *inode);
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static inline blkcnt_t ocfs2_inode_sector_count(struct inode *inode)
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{
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int c_to_s_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits - 9;
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return (blkcnt_t)(OCFS2_I(inode)->ip_clusters << c_to_s_bits);
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}
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#endif /* OCFS2_INODE_H */
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