summaryrefslogtreecommitdiffstats
path: root/kernel/fs/jfs/jfs_imap.h
diff options
context:
space:
mode:
authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/fs/jfs/jfs_imap.h
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/fs/jfs/jfs_imap.h')
-rw-r--r--kernel/fs/jfs/jfs_imap.h175
1 files changed, 175 insertions, 0 deletions
diff --git a/kernel/fs/jfs/jfs_imap.h b/kernel/fs/jfs/jfs_imap.h
new file mode 100644
index 000000000..610a0e9d8
--- /dev/null
+++ b/kernel/fs/jfs/jfs_imap.h
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) International Business Machines Corp., 2000-2002
+ *
+ * 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_IMAP
+#define _H_JFS_IMAP
+
+#include "jfs_txnmgr.h"
+
+/*
+ * jfs_imap.h: disk inode manager
+ */
+
+#define EXTSPERIAG 128 /* number of disk inode extent per iag */
+#define IMAPBLKNO 0 /* lblkno of dinomap within inode map */
+#define SMAPSZ 4 /* number of words per summary map */
+#define EXTSPERSUM 32 /* number of extents per summary map entry */
+#define L2EXTSPERSUM 5 /* l2 number of extents per summary map */
+#define PGSPERIEXT 4 /* number of 4K pages per dinode extent */
+#define MAXIAGS ((1<<20)-1) /* maximum number of iags */
+#define MAXAG 128 /* maximum number of allocation groups */
+
+#define AMAPSIZE 512 /* bytes in the IAG allocation maps */
+#define SMAPSIZE 16 /* bytes in the IAG summary maps */
+
+/* convert inode number to iag number */
+#define INOTOIAG(ino) ((ino) >> L2INOSPERIAG)
+
+/* convert iag number to logical block number of the iag page */
+#define IAGTOLBLK(iagno,l2nbperpg) (((iagno) + 1) << (l2nbperpg))
+
+/* get the starting block number of the 4K page of an inode extent
+ * that contains ino.
+ */
+#define INOPBLK(pxd,ino,l2nbperpg) (addressPXD((pxd)) + \
+ ((((ino) & (INOSPEREXT-1)) >> L2INOSPERPAGE) << (l2nbperpg)))
+
+/*
+ * inode allocation map:
+ *
+ * inode allocation map consists of
+ * . the inode map control page and
+ * . inode allocation group pages (per 4096 inodes)
+ * which are addressed by standard JFS xtree.
+ */
+/*
+ * inode allocation group page (per 4096 inodes of an AG)
+ */
+struct iag {
+ __le64 agstart; /* 8: starting block of ag */
+ __le32 iagnum; /* 4: inode allocation group number */
+ __le32 inofreefwd; /* 4: ag inode free list forward */
+ __le32 inofreeback; /* 4: ag inode free list back */
+ __le32 extfreefwd; /* 4: ag inode extent free list forward */
+ __le32 extfreeback; /* 4: ag inode extent free list back */
+ __le32 iagfree; /* 4: iag free list */
+
+ /* summary map: 1 bit per inode extent */
+ __le32 inosmap[SMAPSZ]; /* 16: sum map of mapwords w/ free inodes;
+ * note: this indicates free and backed
+ * inodes, if the extent is not backed the
+ * value will be 1. if the extent is
+ * backed but all inodes are being used the
+ * value will be 1. if the extent is
+ * backed but at least one of the inodes is
+ * free the value will be 0.
+ */
+ __le32 extsmap[SMAPSZ]; /* 16: sum map of mapwords w/ free extents */
+ __le32 nfreeinos; /* 4: number of free inodes */
+ __le32 nfreeexts; /* 4: number of free extents */
+ /* (72) */
+ u8 pad[1976]; /* 1976: pad to 2048 bytes */
+ /* allocation bit map: 1 bit per inode (0 - free, 1 - allocated) */
+ __le32 wmap[EXTSPERIAG]; /* 512: working allocation map */
+ __le32 pmap[EXTSPERIAG]; /* 512: persistent allocation map */
+ pxd_t inoext[EXTSPERIAG]; /* 1024: inode extent addresses */
+}; /* (4096) */
+
+/*
+ * per AG control information (in inode map control page)
+ */
+struct iagctl_disk {
+ __le32 inofree; /* 4: free inode list anchor */
+ __le32 extfree; /* 4: free extent list anchor */
+ __le32 numinos; /* 4: number of backed inodes */
+ __le32 numfree; /* 4: number of free inodes */
+}; /* (16) */
+
+struct iagctl {
+ int inofree; /* free inode list anchor */
+ int extfree; /* free extent list anchor */
+ int numinos; /* number of backed inodes */
+ int numfree; /* number of free inodes */
+};
+
+/*
+ * per fileset/aggregate inode map control page
+ */
+struct dinomap_disk {
+ __le32 in_freeiag; /* 4: free iag list anchor */
+ __le32 in_nextiag; /* 4: next free iag number */
+ __le32 in_numinos; /* 4: num of backed inodes */
+ __le32 in_numfree; /* 4: num of free backed inodes */
+ __le32 in_nbperiext; /* 4: num of blocks per inode extent */
+ __le32 in_l2nbperiext; /* 4: l2 of in_nbperiext */
+ __le32 in_diskblock; /* 4: for standalone test driver */
+ __le32 in_maxag; /* 4: for standalone test driver */
+ u8 pad[2016]; /* 2016: pad to 2048 */
+ struct iagctl_disk in_agctl[MAXAG]; /* 2048: AG control information */
+}; /* (4096) */
+
+struct dinomap {
+ int in_freeiag; /* free iag list anchor */
+ int in_nextiag; /* next free iag number */
+ int in_numinos; /* num of backed inodes */
+ int in_numfree; /* num of free backed inodes */
+ int in_nbperiext; /* num of blocks per inode extent */
+ int in_l2nbperiext; /* l2 of in_nbperiext */
+ int in_diskblock; /* for standalone test driver */
+ int in_maxag; /* for standalone test driver */
+ struct iagctl in_agctl[MAXAG]; /* AG control information */
+};
+
+/*
+ * In-core inode map control page
+ */
+struct inomap {
+ struct dinomap im_imap; /* 4096: inode allocation control */
+ struct inode *im_ipimap; /* 4: ptr to inode for imap */
+ struct mutex im_freelock; /* 4: iag free list lock */
+ struct mutex im_aglock[MAXAG]; /* 512: per AG locks */
+ u32 *im_DBGdimap;
+ atomic_t im_numinos; /* num of backed inodes */
+ atomic_t im_numfree; /* num of free backed inodes */
+};
+
+#define im_freeiag im_imap.in_freeiag
+#define im_nextiag im_imap.in_nextiag
+#define im_agctl im_imap.in_agctl
+#define im_nbperiext im_imap.in_nbperiext
+#define im_l2nbperiext im_imap.in_l2nbperiext
+
+/* for standalone testdriver
+ */
+#define im_diskblock im_imap.in_diskblock
+#define im_maxag im_imap.in_maxag
+
+extern int diFree(struct inode *);
+extern int diAlloc(struct inode *, bool, struct inode *);
+extern int diSync(struct inode *);
+/* external references */
+extern int diUpdatePMap(struct inode *ipimap, unsigned long inum,
+ bool is_free, struct tblock * tblk);
+extern int diExtendFS(struct inode *ipimap, struct inode *ipbmap);
+extern int diMount(struct inode *);
+extern int diUnmount(struct inode *, int);
+extern int diRead(struct inode *);
+extern struct inode *diReadSpecial(struct super_block *, ino_t, int);
+extern void diWriteSpecial(struct inode *, int);
+extern void diFreeSpecial(struct inode *);
+extern int diWrite(tid_t tid, struct inode *);
+#endif /* _H_JFS_IMAP */