From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- fs/jfs/jfs_incore.h | 228 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 228 insertions(+) create mode 100644 fs/jfs/jfs_incore.h (limited to 'fs/jfs/jfs_incore.h') diff --git a/fs/jfs/jfs_incore.h b/fs/jfs/jfs_incore.h new file mode 100644 index 000000000..fa7e795bd --- /dev/null +++ b/fs/jfs/jfs_incore.h @@ -0,0 +1,228 @@ +/* + * Copyright (C) International Business Machines Corp., 2000-2004 + * 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 +#include +#include +#include +#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 { + int fileset; /* fileset number (always 16)*/ + uint mode2; /* jfs-specific mode */ + kuid_t saved_uid; /* saved for uid mount option */ + kgid_t saved_gid; /* saved for gid mount option */ + 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 */ + unsigned long cflag; /* commit flags */ + u64 agstart; /* agstart of the containing IAG */ + u16 bxflag; /* xflag of pseudo buffer? */ + unchar pad; + 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 */ + spinlock_t ag_lock; /* protects active_ag */ + struct list_head anon_inode_list; /* inodes having anonymous txns */ + /* + * rdwrlock serializes xtree between reads & writes and synchronizes + * changes to special inodes. It's use would be redundant on + * directories since the i_mutex taken in the VFS is sufficient. + */ + struct rw_semaphore rdwrlock; + /* + * commit_mutex 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 mutex commit_mutex; + /* xattr_sem allows us to access the xattrs without taking i_mutex */ + struct rw_semaphore xattr_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; +#ifdef CONFIG_QUOTA + struct dquot *i_dquot[MAXQUOTAS]; +#endif + u32 dev; /* will die when we get wide dev_t */ + struct inode vfs_inode; +}; +#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, subclass) \ + down_read_nested(&JFS_IP(ip)->rdwrlock, subclass) +#define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock) +#define IWRITE_LOCK(ip, subclass) \ + down_write_nested(&JFS_IP(ip)->rdwrlock, subclass) +#define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock) + +/* + * cflag + */ +enum cflags { + 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_Dirtable, /* commit changes to di_dirtable */ + COMMIT_Stale, /* data extent is no longer valid */ + COMMIT_Synclist, /* metadata pages on group commit synclist */ +}; + +/* + * commit_mutex nesting subclasses: + */ +enum commit_mutex_class +{ + COMMIT_MUTEX_PARENT, + COMMIT_MUTEX_CHILD, + COMMIT_MUTEX_SECOND_PARENT, /* Renaming */ + COMMIT_MUTEX_VICTIM /* Inode being unlinked due to rename */ +}; + +/* + * rdwrlock subclasses: + * The dmap inode may be locked while a normal inode or the imap inode are + * locked. + */ +enum rdwrlock_class +{ + RDWRLOCK_NORMAL, + RDWRLOCK_IMAP, + RDWRLOCK_DMAP +}; + +#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 { + struct super_block *sb; /* Point back to vfs super block */ + unsigned long mntflag; /* aggregate attributes */ + struct inode *ipbmap; /* block map inode */ + struct inode *ipaimap; /* aggregate inode map inode */ + struct inode *ipaimap2; /* secondary aimap inode */ + struct inode *ipimap; /* aggregate inode map inode */ + struct jfs_log *log; /* log */ + struct list_head log_list; /* volumes associated with a journal */ + short bsize; /* logical block size */ + short l2bsize; /* log2 logical block size */ + short nbperpage; /* blocks per page */ + short l2nbperpage; /* log2 blocks per page */ + short l2niperblk; /* log2 inodes per page */ + dev_t logdev; /* external log device */ + uint aggregate; /* volume identifier in log record */ + pxd_t logpxd; /* pxd describing log */ + pxd_t fsckpxd; /* pxd describing fsck wkspc */ + pxd_t ait2; /* pxd describing AIT copy */ + char uuid[16]; /* 128-bit uuid for volume */ + char loguuid[16]; /* 128-bit uuid for log */ + /* + * commit_state is used for synchronization of the jfs_commit + * threads. It is protected by LAZY_LOCK(). + */ + int commit_state; /* commit state */ + /* Formerly in ipimap */ + uint gengen; /* inode generation generator*/ + uint inostamp; /* shows inode belongs to fileset*/ + + /* Formerly in ipbmap */ + struct bmap *bmap; /* incore bmap descriptor */ + struct nls_table *nls_tab; /* current codepage */ + struct inode *direct_inode; /* metadata inode */ + uint state; /* mount/recovery state */ + unsigned long flag; /* mount time flags */ + uint p_state; /* state prior to going no integrity */ + kuid_t uid; /* uid to override on-disk uid */ + kgid_t gid; /* gid to override on-disk gid */ + uint umask; /* umask to override on-disk umask */ + uint minblks_trim; /* minimum blocks, for online trim */ +}; + +/* jfs_sb_info commit_state */ +#define IN_LAZYCOMMIT 1 + +static inline struct jfs_inode_info *JFS_IP(struct inode *inode) +{ + return list_entry(inode, struct jfs_inode_info, vfs_inode); +} + +static inline int jfs_dirtable_inline(struct inode *inode) +{ + return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1)); +} + +static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb) +{ + return sb->s_fs_info; +} + +static inline int isReadOnly(struct inode *inode) +{ + if (JFS_SBI(inode->i_sb)->log) + return 0; + return 1; +} +#endif /* _H_JFS_INCORE */ -- cgit v1.2.3-54-g00ecf