24c19ef404
OCFS2 puts inode meta data in the "lock value block" provided by the DLM. Typically, i_generation is encoded in the lock name so that a deleted inode on and a new one in the same block don't share the same lvb. Unfortunately, that scheme means that the read in ocfs2_read_locked_inode() is potentially thrown away as soon as the meta data lock is taken - we cannot encode the lock name without first knowing i_generation, which requires a disk read. This patch encodes i_generation in the inode meta data lvb, and removes the value from the inode meta data lock name. This way, the read can be covered by a lock, and at the same time we can distinguish between an up to date and a stale LVB. This will help cold-cache stat(2) performance in particular. Since this patch changes the protocol version, we take the opportunity to do a minor re-organization of two of the LVB fields. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
154 lines
5.2 KiB
C
154 lines
5.2 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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/* 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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/* 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 ocfs2_extent_map ip_map;
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struct list_head ip_io_markers;
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int ip_orphaned_slot;
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struct mutex ip_io_mutex;
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/* Used by the journalling code to attach an inode to a
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* handle. These are protected by ip_io_mutex in order to lock
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* out other I/O to the inode until we either commit or
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* abort. */
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struct list_head ip_handle_list;
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struct ocfs2_journal_handle *ip_handle;
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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 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 kmem_cache_t *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_NOWAIT 0x1
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#define OCFS2_FI_FLAG_DELETE 0x2
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#define OCFS2_FI_FLAG_SYSFILE 0x4
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#define OCFS2_FI_FLAG_NOLOCK 0x8
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struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, int flags);
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struct inode *ocfs2_ilookup_for_vote(struct ocfs2_super *osb,
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u64 blkno,
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int delete_vote);
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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(struct ocfs2_journal_handle *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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#endif /* OCFS2_INODE_H */
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