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TOMOYO Linux Cross Reference
Linux/fs/jfs/jfs_incore.h

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  1 /*
  2  *   Copyright (C) International Business Machines Corp., 2000-2004
  3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
  4  *
  5  *   This program is free software;  you can redistribute it and/or modify
  6  *   it under the terms of the GNU General Public License as published by
  7  *   the Free Software Foundation; either version 2 of the License, or
  8  *   (at your option) any later version.
  9  *
 10  *   This program is distributed in the hope that it will be useful,
 11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 13  *   the GNU General Public License for more details.
 14  *
 15  *   You should have received a copy of the GNU General Public License
 16  *   along with this program;  if not, write to the Free Software
 17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 18  */
 19 #ifndef _H_JFS_INCORE
 20 #define _H_JFS_INCORE
 21 
 22 #include <linux/mutex.h>
 23 #include <linux/rwsem.h>
 24 #include <linux/slab.h>
 25 #include <linux/bitops.h>
 26 #include "jfs_types.h"
 27 #include "jfs_xtree.h"
 28 #include "jfs_dtree.h"
 29 
 30 /*
 31  * JFS magic number
 32  */
 33 #define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */
 34 
 35 /*
 36  * JFS-private inode information
 37  */
 38 struct jfs_inode_info {
 39         int     fileset;        /* fileset number (always 16)*/
 40         uint    mode2;          /* jfs-specific mode            */
 41         kuid_t  saved_uid;      /* saved for uid mount option */
 42         kgid_t  saved_gid;      /* saved for gid mount option */
 43         pxd_t   ixpxd;          /* inode extent descriptor      */
 44         dxd_t   acl;            /* dxd describing acl   */
 45         dxd_t   ea;             /* dxd describing ea    */
 46         time_t  otime;          /* time created */
 47         uint    next_index;     /* next available directory entry index */
 48         int     acltype;        /* Type of ACL  */
 49         short   btorder;        /* access order */
 50         short   btindex;        /* btpage entry index*/
 51         struct inode *ipimap;   /* inode map                    */
 52         unsigned long cflag;    /* commit flags         */
 53         u64     agstart;        /* agstart of the containing IAG */
 54         u16     bxflag;         /* xflag of pseudo buffer?      */
 55         unchar  pad;
 56         signed char active_ag;  /* ag currently allocating from */
 57         lid_t   blid;           /* lid of pseudo buffer?        */
 58         lid_t   atlhead;        /* anonymous tlock list head    */
 59         lid_t   atltail;        /* anonymous tlock list tail    */
 60         spinlock_t ag_lock;     /* protects active_ag           */
 61         struct list_head anon_inode_list; /* inodes having anonymous txns */
 62         /*
 63          * rdwrlock serializes xtree between reads & writes and synchronizes
 64          * changes to special inodes.  It's use would be redundant on
 65          * directories since the i_mutex taken in the VFS is sufficient.
 66          */
 67         struct rw_semaphore rdwrlock;
 68         /*
 69          * commit_mutex serializes transaction processing on an inode.
 70          * It must be taken after beginning a transaction (txBegin), since
 71          * dirty inodes may be committed while a new transaction on the
 72          * inode is blocked in txBegin or TxBeginAnon
 73          */
 74         struct mutex commit_mutex;
 75         /* xattr_sem allows us to access the xattrs without taking i_mutex */
 76         struct rw_semaphore xattr_sem;
 77         lid_t   xtlid;          /* lid of xtree lock on directory */
 78         union {
 79                 struct {
 80                         xtpage_t _xtroot;       /* 288: xtree root */
 81                         struct inomap *_imap;   /* 4: inode map header  */
 82                 } file;
 83                 struct {
 84                         struct dir_table_slot _table[12]; /* 96: dir index */
 85                         dtroot_t _dtroot;       /* 288: dtree root */
 86                 } dir;
 87                 struct {
 88                         unchar _unused[16];     /* 16: */
 89                         dxd_t _dxd;             /* 16: */
 90                         unchar _inline[128];    /* 128: inline symlink */
 91                         /* _inline_ea may overlay the last part of
 92                          * file._xtroot if maxentry = XTROOTINITSLOT
 93                          */
 94                         unchar _inline_ea[128]; /* 128: inline extended attr */
 95                 } link;
 96         } u;
 97 #ifdef CONFIG_QUOTA
 98         struct dquot *i_dquot[MAXQUOTAS];
 99 #endif
100         u32 dev;        /* will die when we get wide dev_t */
101         struct inode    vfs_inode;
102 };
103 #define i_xtroot u.file._xtroot
104 #define i_imap u.file._imap
105 #define i_dirtable u.dir._table
106 #define i_dtroot u.dir._dtroot
107 #define i_inline u.link._inline
108 #define i_inline_ea u.link._inline_ea
109 
110 #define IREAD_LOCK(ip, subclass) \
111         down_read_nested(&JFS_IP(ip)->rdwrlock, subclass)
112 #define IREAD_UNLOCK(ip)        up_read(&JFS_IP(ip)->rdwrlock)
113 #define IWRITE_LOCK(ip, subclass) \
114         down_write_nested(&JFS_IP(ip)->rdwrlock, subclass)
115 #define IWRITE_UNLOCK(ip)       up_write(&JFS_IP(ip)->rdwrlock)
116 
117 /*
118  * cflag
119  */
120 enum cflags {
121         COMMIT_Nolink,          /* inode committed with zero link count */
122         COMMIT_Inlineea,        /* commit inode inline EA */
123         COMMIT_Freewmap,        /* free WMAP at iClose() */
124         COMMIT_Dirty,           /* Inode is really dirty */
125         COMMIT_Dirtable,        /* commit changes to di_dirtable */
126         COMMIT_Stale,           /* data extent is no longer valid */
127         COMMIT_Synclist,        /* metadata pages on group commit synclist */
128 };
129 
130 /*
131  * commit_mutex nesting subclasses:
132  */
133 enum commit_mutex_class
134 {
135         COMMIT_MUTEX_PARENT,
136         COMMIT_MUTEX_CHILD,
137         COMMIT_MUTEX_SECOND_PARENT,     /* Renaming */
138         COMMIT_MUTEX_VICTIM             /* Inode being unlinked due to rename */
139 };
140 
141 /*
142  * rdwrlock subclasses:
143  * The dmap inode may be locked while a normal inode or the imap inode are
144  * locked.
145  */
146 enum rdwrlock_class
147 {
148         RDWRLOCK_NORMAL,
149         RDWRLOCK_IMAP,
150         RDWRLOCK_DMAP
151 };
152 
153 #define set_cflag(flag, ip)     set_bit(flag, &(JFS_IP(ip)->cflag))
154 #define clear_cflag(flag, ip)   clear_bit(flag, &(JFS_IP(ip)->cflag))
155 #define test_cflag(flag, ip)    test_bit(flag, &(JFS_IP(ip)->cflag))
156 #define test_and_clear_cflag(flag, ip) \
157         test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
158 /*
159  * JFS-private superblock information.
160  */
161 struct jfs_sb_info {
162         struct super_block *sb;         /* Point back to vfs super block */
163         unsigned long   mntflag;        /* aggregate attributes */
164         struct inode    *ipbmap;        /* block map inode              */
165         struct inode    *ipaimap;       /* aggregate inode map inode    */
166         struct inode    *ipaimap2;      /* secondary aimap inode        */
167         struct inode    *ipimap;        /* aggregate inode map inode    */
168         struct jfs_log  *log;           /* log                  */
169         struct list_head log_list;      /* volumes associated with a journal */
170         short           bsize;          /* logical block size   */
171         short           l2bsize;        /* log2 logical block size      */
172         short           nbperpage;      /* blocks per page              */
173         short           l2nbperpage;    /* log2 blocks per page */
174         short           l2niperblk;     /* log2 inodes per page */
175         dev_t           logdev;         /* external log device  */
176         uint            aggregate;      /* volume identifier in log record */
177         pxd_t           logpxd;         /* pxd describing log   */
178         pxd_t           fsckpxd;        /* pxd describing fsck wkspc */
179         pxd_t           ait2;           /* pxd describing AIT copy      */
180         char            uuid[16];       /* 128-bit uuid for volume      */
181         char            loguuid[16];    /* 128-bit uuid for log */
182         /*
183          * commit_state is used for synchronization of the jfs_commit
184          * threads.  It is protected by LAZY_LOCK().
185          */
186         int             commit_state;   /* commit state */
187         /* Formerly in ipimap */
188         uint            gengen;         /* inode generation generator*/
189         uint            inostamp;       /* shows inode belongs to fileset*/
190 
191         /* Formerly in ipbmap */
192         struct bmap     *bmap;          /* incore bmap descriptor       */
193         struct nls_table *nls_tab;      /* current codepage             */
194         struct inode *direct_inode;     /* metadata inode */
195         uint            state;          /* mount/recovery state */
196         unsigned long   flag;           /* mount time flags */
197         uint            p_state;        /* state prior to going no integrity */
198         kuid_t          uid;            /* uid to override on-disk uid */
199         kgid_t          gid;            /* gid to override on-disk gid */
200         uint            umask;          /* umask to override on-disk umask */
201         uint            minblks_trim;   /* minimum blocks, for online trim */
202 };
203 
204 /* jfs_sb_info commit_state */
205 #define IN_LAZYCOMMIT 1
206 
207 static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
208 {
209         return container_of(inode, struct jfs_inode_info, vfs_inode);
210 }
211 
212 static inline int jfs_dirtable_inline(struct inode *inode)
213 {
214         return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
215 }
216 
217 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
218 {
219         return sb->s_fs_info;
220 }
221 
222 static inline int isReadOnly(struct inode *inode)
223 {
224         if (JFS_SBI(inode->i_sb)->log)
225                 return 0;
226         return 1;
227 }
228 #endif /* _H_JFS_INCORE */
229 

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