225 lines
7.3 KiB
C
225 lines
7.3 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2000-2004
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* Portions Copyright (C) Christoph Hellwig, 2001-2002
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* the GNU 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 License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _H_JFS_INCORE
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#define _H_JFS_INCORE
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#include <linux/mutex.h>
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#include <linux/rwsem.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include "jfs_types.h"
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#include "jfs_xtree.h"
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#include "jfs_dtree.h"
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/*
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* JFS magic number
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*/
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#define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */
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/*
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* JFS-private inode information
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*/
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struct jfs_inode_info {
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int fileset; /* fileset number (always 16)*/
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uint mode2; /* jfs-specific mode */
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uint saved_uid; /* saved for uid mount option */
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uint saved_gid; /* saved for gid mount option */
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pxd_t ixpxd; /* inode extent descriptor */
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dxd_t acl; /* dxd describing acl */
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dxd_t ea; /* dxd describing ea */
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time_t otime; /* time created */
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uint next_index; /* next available directory entry index */
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int acltype; /* Type of ACL */
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short btorder; /* access order */
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short btindex; /* btpage entry index*/
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struct inode *ipimap; /* inode map */
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unsigned long cflag; /* commit flags */
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u64 agstart; /* agstart of the containing IAG */
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u16 bxflag; /* xflag of pseudo buffer? */
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unchar pad;
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signed char active_ag; /* ag currently allocating from */
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lid_t blid; /* lid of pseudo buffer? */
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lid_t atlhead; /* anonymous tlock list head */
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lid_t atltail; /* anonymous tlock list tail */
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spinlock_t ag_lock; /* protects active_ag */
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struct list_head anon_inode_list; /* inodes having anonymous txns */
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/*
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* rdwrlock serializes xtree between reads & writes and synchronizes
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* changes to special inodes. It's use would be redundant on
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* directories since the i_mutex taken in the VFS is sufficient.
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*/
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struct rw_semaphore rdwrlock;
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/*
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* commit_mutex serializes transaction processing on an inode.
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* It must be taken after beginning a transaction (txBegin), since
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* dirty inodes may be committed while a new transaction on the
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* inode is blocked in txBegin or TxBeginAnon
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*/
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struct mutex commit_mutex;
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/* xattr_sem allows us to access the xattrs without taking i_mutex */
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struct rw_semaphore xattr_sem;
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lid_t xtlid; /* lid of xtree lock on directory */
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union {
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struct {
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xtpage_t _xtroot; /* 288: xtree root */
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struct inomap *_imap; /* 4: inode map header */
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} file;
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struct {
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struct dir_table_slot _table[12]; /* 96: dir index */
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dtroot_t _dtroot; /* 288: dtree root */
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} dir;
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struct {
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unchar _unused[16]; /* 16: */
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dxd_t _dxd; /* 16: */
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unchar _inline[128]; /* 128: inline symlink */
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/* _inline_ea may overlay the last part of
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* file._xtroot if maxentry = XTROOTINITSLOT
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*/
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unchar _inline_ea[128]; /* 128: inline extended attr */
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} link;
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} u;
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u32 dev; /* will die when we get wide dev_t */
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struct inode vfs_inode;
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};
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#define i_xtroot u.file._xtroot
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#define i_imap u.file._imap
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#define i_dirtable u.dir._table
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#define i_dtroot u.dir._dtroot
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#define i_inline u.link._inline
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#define i_inline_ea u.link._inline_ea
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#define IREAD_LOCK(ip, subclass) \
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down_read_nested(&JFS_IP(ip)->rdwrlock, subclass)
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#define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock)
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#define IWRITE_LOCK(ip, subclass) \
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down_write_nested(&JFS_IP(ip)->rdwrlock, subclass)
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#define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock)
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/*
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* cflag
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*/
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enum cflags {
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COMMIT_Nolink, /* inode committed with zero link count */
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COMMIT_Inlineea, /* commit inode inline EA */
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COMMIT_Freewmap, /* free WMAP at iClose() */
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COMMIT_Dirty, /* Inode is really dirty */
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COMMIT_Dirtable, /* commit changes to di_dirtable */
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COMMIT_Stale, /* data extent is no longer valid */
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COMMIT_Synclist, /* metadata pages on group commit synclist */
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};
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/*
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* commit_mutex nesting subclasses:
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*/
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enum commit_mutex_class
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{
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COMMIT_MUTEX_PARENT,
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COMMIT_MUTEX_CHILD,
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COMMIT_MUTEX_SECOND_PARENT, /* Renaming */
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COMMIT_MUTEX_VICTIM /* Inode being unlinked due to rename */
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};
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/*
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* rdwrlock subclasses:
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* The dmap inode may be locked while a normal inode or the imap inode are
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* locked.
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*/
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enum rdwrlock_class
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{
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RDWRLOCK_NORMAL,
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RDWRLOCK_IMAP,
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RDWRLOCK_DMAP
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};
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#define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag))
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#define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag))
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#define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag))
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#define test_and_clear_cflag(flag, ip) \
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test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
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/*
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* JFS-private superblock information.
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*/
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struct jfs_sb_info {
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struct super_block *sb; /* Point back to vfs super block */
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unsigned long mntflag; /* aggregate attributes */
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struct inode *ipbmap; /* block map inode */
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struct inode *ipaimap; /* aggregate inode map inode */
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struct inode *ipaimap2; /* secondary aimap inode */
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struct inode *ipimap; /* aggregate inode map inode */
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struct jfs_log *log; /* log */
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struct list_head log_list; /* volumes associated with a journal */
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short bsize; /* logical block size */
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short l2bsize; /* log2 logical block size */
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short nbperpage; /* blocks per page */
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short l2nbperpage; /* log2 blocks per page */
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short l2niperblk; /* log2 inodes per page */
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dev_t logdev; /* external log device */
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uint aggregate; /* volume identifier in log record */
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pxd_t logpxd; /* pxd describing log */
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pxd_t fsckpxd; /* pxd describing fsck wkspc */
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pxd_t ait2; /* pxd describing AIT copy */
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char uuid[16]; /* 128-bit uuid for volume */
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char loguuid[16]; /* 128-bit uuid for log */
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/*
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* commit_state is used for synchronization of the jfs_commit
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* threads. It is protected by LAZY_LOCK().
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*/
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int commit_state; /* commit state */
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/* Formerly in ipimap */
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uint gengen; /* inode generation generator*/
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uint inostamp; /* shows inode belongs to fileset*/
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/* Formerly in ipbmap */
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struct bmap *bmap; /* incore bmap descriptor */
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struct nls_table *nls_tab; /* current codepage */
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struct inode *direct_inode; /* metadata inode */
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uint state; /* mount/recovery state */
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unsigned long flag; /* mount time flags */
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uint p_state; /* state prior to going no integrity */
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uint uid; /* uid to override on-disk uid */
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uint gid; /* gid to override on-disk gid */
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uint umask; /* umask to override on-disk umask */
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};
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/* jfs_sb_info commit_state */
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#define IN_LAZYCOMMIT 1
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static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
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{
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return list_entry(inode, struct jfs_inode_info, vfs_inode);
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}
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static inline int jfs_dirtable_inline(struct inode *inode)
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{
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return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
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}
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static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
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{
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return sb->s_fs_info;
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}
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static inline int isReadOnly(struct inode *inode)
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{
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if (JFS_SBI(inode->i_sb)->log)
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return 0;
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return 1;
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}
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#endif /* _H_JFS_INCORE */
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