jfs_incore.h
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- /*
- * Copyright (c) International Business Machines Corp., 2000-2002
- * Portions Copyright (c) Christoph Hellwig, 2001-2002
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #ifndef _H_JFS_INCORE
- #define _H_JFS_INCORE
- #include <linux/rwsem.h>
- #include <linux/slab.h>
- #include <asm/bitops.h>
- #include "jfs_types.h"
- #include "jfs_xtree.h"
- #include "jfs_dtree.h"
- /*
- * JFS magic number
- */
- #define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */
- /*
- * JFS-private inode information
- */
- struct jfs_inode_info {
- struct inode *inode; /* pointer back to fs-independent inode */
- int fileset; /* fileset number (always 16)*/
- uint mode2; /* jfs-specific mode */
- pxd_t ixpxd; /* inode extent descriptor */
- dxd_t acl; /* dxd describing acl */
- dxd_t ea; /* dxd describing ea */
- time_t otime; /* time created */
- uint next_index; /* next available directory entry index */
- int acltype; /* Type of ACL */
- short btorder; /* access order */
- short btindex; /* btpage entry index*/
- struct inode *ipimap; /* inode map */
- long cflag; /* commit flags */
- u16 bxflag; /* xflag of pseudo buffer? */
- unchar agno; /* ag number */
- signed char active_ag; /* ag currently allocating from */
- lid_t blid; /* lid of pseudo buffer? */
- lid_t atlhead; /* anonymous tlock list head */
- lid_t atltail; /* anonymous tlock list tail */
- struct list_head anon_inode_list; /* inodes having anonymous txns */
- struct list_head mp_list; /* metapages in inode's address space */
- /*
- * rdwrlock serializes xtree between reads & writes and synchronizes
- * changes to special inodes. It's use would be redundant on
- * directories since the i_sem taken in the VFS is sufficient.
- */
- struct rw_semaphore rdwrlock;
- /*
- * commit_sem serializes transaction processing on an inode.
- * It must be taken after beginning a transaction (txBegin), since
- * dirty inodes may be committed while a new transaction on the
- * inode is blocked in txBegin or TxBeginAnon
- */
- struct semaphore commit_sem;
- lid_t xtlid; /* lid of xtree lock on directory */
- union {
- struct {
- xtpage_t _xtroot; /* 288: xtree root */
- struct inomap *_imap; /* 4: inode map header */
- } file;
- struct {
- struct dir_table_slot _table[12]; /* 96: dir index */
- dtroot_t _dtroot; /* 288: dtree root */
- } dir;
- struct {
- unchar _unused[16]; /* 16: */
- dxd_t _dxd; /* 16: */
- unchar _inline[128]; /* 128: inline symlink */
- /* _inline_ea may overlay the last part of
- * file._xtroot if maxentry = XTROOTINITSLOT
- */
- unchar _inline_ea[128]; /* 128: inline extended attr */
- } link;
- } u;
- };
- #define i_xtroot u.file._xtroot
- #define i_imap u.file._imap
- #define i_dirtable u.dir._table
- #define i_dtroot u.dir._dtroot
- #define i_inline u.link._inline
- #define i_inline_ea u.link._inline_ea
- #define IREAD_LOCK(ip) down_read(&JFS_IP(ip)->rdwrlock)
- #define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock)
- #define IWRITE_LOCK(ip) down_write(&JFS_IP(ip)->rdwrlock)
- #define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock)
- /*
- * cflag
- */
- enum cflags {
- COMMIT_New, /* never committed inode */
- COMMIT_Nolink, /* inode committed with zero link count */
- COMMIT_Inlineea, /* commit inode inline EA */
- COMMIT_Freewmap, /* free WMAP at iClose() */
- COMMIT_Dirty, /* Inode is really dirty */
- COMMIT_Holdlock, /* Hold the IWRITE_LOCK until commit is done */
- COMMIT_Dirtable, /* commit changes to di_dirtable */
- COMMIT_Stale, /* data extent is no longer valid */
- COMMIT_Synclist, /* metadata pages on group commit synclist */
- };
- #define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag))
- #define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag))
- #define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag))
- #define test_and_clear_cflag(flag, ip)
- test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
- /*
- * JFS-private superblock information.
- */
- struct jfs_sb_info {
- unsigned long mntflag; /* 4: aggregate attributes */
- struct inode *ipbmap; /* 4: block map inode */
- struct inode *ipaimap; /* 4: aggregate inode map inode */
- struct inode *ipaimap2; /* 4: secondary aimap inode */
- struct inode *ipimap; /* 4: aggregate inode map inode */
- struct jfs_log *log; /* 4: log */
- short bsize; /* 2: logical block size */
- short l2bsize; /* 2: log2 logical block size */
- short nbperpage; /* 2: blocks per page */
- short l2nbperpage; /* 2: log2 blocks per page */
- short l2niperblk; /* 2: log2 inodes per page */
- kdev_t logdev; /* 2: external log device */
- uint aggregate; /* volume identifier in log record */
- pxd_t logpxd; /* 8: pxd describing log */
- pxd_t fsckpxd; /* 8: pxd describing fsck wkspc */
- pxd_t ait2; /* 8: pxd describing AIT copy */
- char uuid[16]; /* 16: 128-bit uuid for volume */
- char loguuid[16]; /* 16: 128-bit uuid for log */
- /* Formerly in ipimap */
- uint gengen; /* 4: inode generation generator*/
- uint inostamp; /* 4: shows inode belongs to fileset*/
- /* Formerly in ipbmap */
- struct bmap *bmap; /* 4: incore bmap descriptor */
- struct nls_table *nls_tab; /* 4: current codepage */
- uint state; /* 4: mount/recovery state */
- };
- static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
- {
- return inode->u.generic_ip;
- }
- static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
- {
- return sb->u.generic_sbp;
- }
- static inline int isReadOnly(struct inode *inode)
- {
- if (JFS_SBI(inode->i_sb)->log)
- return 0;
- return 1;
- }
- /*
- * Allocating and freeing the structure
- */
- extern kmem_cache_t *jfs_inode_cachep;
- extern int alloc_jfs_inode(struct inode *);
- #define free_jfs_inode(inode)
- kmem_cache_free(jfs_inode_cachep, (inode)->u.generic_ip)
- #endif /* _H_JFS_INCORE */