209-mini_fo.patch

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+ * This Copyright notice must be kept intact and distributed with all
+ * fistgen sources INCLUDING sources generated by fistgen.
+ */
+/*
+ * Copyright (C) 2004, 2005 Markus Klotzbuecher <[e-mail]>
+ *
+ * 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.
+ */
+
+
+/*
+ *  $Id$
+ */
+
+#ifndef __FIST_H_
+#define __FIST_H_
+
+/*
+ * KERNEL ONLY CODE:
+ */
+#ifdef __KERNEL__
+#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)
+#include <linux/autoconf.h>
+#else
+#include <linux/config.h>
+#endif
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+#ifdef CONFIG_MODVERSIONS
+# define MODVERSIONS
+# include <linux/modversions.h>
+#endif /* CONFIG_MODVERSIONS */
+#endif /* KERNEL_VERSION < 2.6.0 */
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/limits.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+#include <linux/locks.h>
+#else
+#include <linux/buffer_head.h>
+#include <linux/pagemap.h>
+#include <linux/namei.h>
+#include <linux/module.h>
+#include <linux/mount.h>
+#include <linux/page-flags.h>
+#include <linux/writeback.h>
+#include <linux/statfs.h>
+#endif
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/file.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/poll.h>
+#include <linux/list.h>
+#include <linux/init.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20)
+#include <linux/xattr.h>
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+#include <linux/security.h>
+#endif
+
+#include <linux/swap.h>
+
+#include <asm/system.h>
+/* #include <asm/segment.h> */
+#include <asm/mman.h>
+#include <linux/seq_file.h>
+
+/*
+ * MACROS:
+ */
+
+/* those mapped to ATTR_* were copied from linux/fs.h */
+#define FA_MODE		ATTR_MODE
+#define FA_UID		ATTR_UID
+#define FA_GID		ATTR_GID
+#define FA_SIZE		ATTR_SIZE
+#define FA_ATIME	ATTR_ATIME
+#define FA_MTIME	ATTR_MTIME
+#define FA_CTIME	ATTR_CTIME
+#define FA_ATIME_SET	ATTR_ATIME_SET
+#define FA_MTIME_SET	ATTR_MTIME_SET
+#define FA_FORCE	ATTR_FORCE
+#define FA_ATTR_FLAGS	ATTR_ATTR_FLAG
+
+/* must be greater than all other ATTR_* flags! */
+#define FA_NLINK	2048
+#define FA_BLKSIZE	4096
+#define FA_BLOCKS	8192
+#define FA_TIMES	(FA_ATIME|FA_MTIME|FA_CTIME)
+#define FA_ALL		0
+
+/* macros to manage changes between kernels */
+#define INODE_DATA(i)	(&(i)->i_data)
+
+#define MIN(x,y) ((x < y) ? (x) : (y))
+#define MAX(x,y) ((x > y) ? (x) : (y))
+#define MAXPATHLEN PATH_MAX
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,5)
+# define lookup_one_len(a,b,c) lookup_one(a,b)
+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,4,5) */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,8)
+# define generic_file_llseek default_llseek
+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,4,8) */
+
+#ifndef SEEK_SET
+# define SEEK_SET 0
+#endif /* not SEEK_SET */
+
+#ifndef SEEK_CUR
+# define SEEK_CUR 1
+#endif /* not SEEK_CUR */
+
+#ifndef SEEK_END
+# define SEEK_END 2
+#endif /* not SEEK_END */
+
+#ifndef DEFAULT_POLLMASK
+# define DEFAULT_POLLMASK (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
+#endif /* not DEFAULT_POLLMASK */
+
+/* XXX: fix this so fistgen generates kfree() code directly */
+#define kfree_s(a,b) kfree(a)
+
+/*
+ * TYPEDEFS:
+ */
+typedef struct dentry dentry_t;
+typedef struct file file_t;
+typedef struct inode inode_t;
+typedef inode_t vnode_t;
+typedef struct page page_t;
+typedef struct qstr qstr_t;
+typedef struct super_block super_block_t;
+typedef super_block_t vfs_t;
+typedef struct vm_area_struct vm_area_t;
+
+
+/*
+ * EXTERNALS:
+ */
+
+#define FPPF(str,page) printk("PPF %s 0x%x/%d: Lck:%d Err:%d Ref:%d Upd:%d Other::%d:%d:%d:%d:\n", \
+		str, \
+		(int) page, \
+		(int) page->index, \
+		(PageLocked(page) ? 1 : 0), \
+		(PageError(page) ? 1 : 0), \
+		(PageReferenced(page) ? 1 : 0), \
+		(Page_Uptodate(page) ? 1 : 0), \
+		(PageDecrAfter(page) ? 1 : 0), \
+		(PageSlab(page) ? 1 : 0), \
+		(PageSwapCache(page) ? 1 : 0), \
+		(PageReserved(page) ? 1 : 0) \
+		)
+#define EZKDBG printk("EZK %s:%d:%s\n",__FILE__,__LINE__,__FUNCTION__)
+#if 0
+# define EZKDBG1 printk("EZK %s:%d\n",__FILE__,__LINE__)
+#else
+# define EZKDBG1
+#endif
+
+extern int fist_get_debug_value(void);
+extern int fist_set_debug_value(int val);
+#if 0 /* mini_fo doesn't need these */
+extern void fist_dprint_internal(int level, char *str,...);
+extern void fist_print_dentry(char *str, const dentry_t *dentry);
+extern void fist_print_inode(char *str, const inode_t *inode);
+extern void fist_print_file(char *str, const file_t *file);
+extern void fist_print_buffer_flags(char *str, struct buffer_head *buffer);
+extern void fist_print_page_flags(char *str, page_t *page);
+extern void fist_print_page_bytes(char *str, page_t *page);
+extern void fist_print_pte_flags(char *str, const page_t *page);
+extern void fist_checkinode(inode_t *inode, char *msg);
+extern void fist_print_sb(char *str, const super_block_t *sb);
+
+/* 搂$% by mk: special debug functions */
+extern void fist_mk_print_dentry(char *str, const dentry_t *dentry);
+extern void fist_mk_print_inode(char *str, const inode_t *inode);
+
+extern char *add_indent(void);
+extern char *del_indent(void);
+#endif/* mini_fo doesn't need these */
+
+
+#define STATIC
+#define ASSERT(EX)	\
+do {	\
+    if (!(EX)) {	\
+	printk(KERN_CRIT "ASSERTION FAILED: %s at %s:%d (%s)\n", #EX,	\
+	       __FILE__, __LINE__, __FUNCTION__);	\
+	(*((char *)0))=0;	\
+    }	\
+} while (0)
+/* same ASSERT, but tell me who was the caller of the function */
+#define ASSERT2(EX)	\
+do {	\
+    if (!(EX)) {	\
+	printk(KERN_CRIT "ASSERTION FAILED (caller): %s at %s:%d (%s)\n", #EX,	\
+	       file, line, func);	\
+	(*((char *)0))=0;	\
+    }	\
+} while (0)
+
+#if 0 /* mini_fo doesn't need these */
+#define dprintk(format, args...) printk(KERN_DEBUG format, ##args)
+#define fist_dprint(level, str, args...) fist_dprint_internal(level, KERN_DEBUG str, ## args)
+#define print_entry_location() fist_dprint(4, "%sIN:  %s %s:%d\n", add_indent(), __FUNCTION__, __FILE__, __LINE__)
+#define print_exit_location() fist_dprint(4, "%s OUT: %s %s:%d\n", del_indent(), __FUNCTION__, __FILE__, __LINE__)
+#define print_exit_status(status) fist_dprint(4, "%s OUT: %s %s:%d, STATUS: %d\n", del_indent(), __FUNCTION__, __FILE__, __LINE__, status)
+#define print_exit_pointer(status) \
+do { \
+  if (IS_ERR(status)) \
+    fist_dprint(4, "%s OUT: %s %s:%d, RESULT: %ld\n", del_indent(), __FUNCTION__, __FILE__, __LINE__, PTR_ERR(status)); \
+  else \
+    fist_dprint(4, "%s OUT: %s %s:%d, RESULT: 0x%x\n", del_indent(), __FUNCTION__, __FILE__, __LINE__, PTR_ERR(status)); \
+} while (0)
+#endif/* mini_fo doesn't need these */
+
+#endif /* __KERNEL__ */
+
+
+/*
+ * DEFINITIONS FOR USER AND KERNEL CODE:
+ * (Note: ioctl numbers 1--9 are reserved for fistgen, the rest
+ *  are auto-generated automatically based on the user's .fist file.)
+ */
+# define FIST_IOCTL_GET_DEBUG_VALUE	_IOR(0x15, 1, int)
+# define FIST_IOCTL_SET_DEBUG_VALUE	_IOW(0x15, 2, int)
+
+#endif /* not __FIST_H_ */
Index: linux-2.6.21.7/fs/mini_fo/inode.c
===================================================================
--- /dev/null
+++ linux-2.6.21.7/fs/mini_fo/inode.c
@@ -0,0 +1,1564 @@
+/*
+ * Copyright (c) 1997-2003 Erez Zadok
+ * Copyright (c) 2001-2003 Stony Brook University
+ *
+ * For specific licensing information, see the COPYING file distributed with
+ * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
+ *
+ * This Copyright notice must be kept intact and distributed with all
+ * fistgen sources INCLUDING sources generated by fistgen.
+ */
+/*
+ * Copyright (C) 2004, 2005 Markus Klotzbuecher <[e-mail]>
+ *
+ * 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.
+ */
+
+/*
+ *  $Id$
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif 
+
+#include "fist.h"
+#include "mini_fo.h"
+
+STATIC int
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+mini_fo_create(inode_t *dir, dentry_t *dentry, int mode, struct nameidata *nd)
+#else
+mini_fo_create(inode_t *dir, dentry_t *dentry, int mode)
+#endif
+{
+	int err = 0;
+
+	check_mini_fo_dentry(dentry);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+	err = create_sto_reg_file(dentry, mode, nd);
+#else
+	err = create_sto_reg_file(dentry, mode);
+#endif
+	check_mini_fo_dentry(dentry);
+	return err;
+}
+
+
+STATIC dentry_t *
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+mini_fo_lookup(inode_t *dir, dentry_t *dentry, struct nameidata* nd)
+#else
+mini_fo_lookup(inode_t *dir, dentry_t *dentry)
+#endif
+{
+	int err = 0;
+	dentry_t *hidden_dir_dentry;
+	dentry_t *hidden_dentry = NULL;
+
+	dentry_t *hidden_sto_dir_dentry;
+	dentry_t *hidden_sto_dentry = NULL;
+
+	/* whiteout flag */
+	int del_flag = 0; 
+	char *bpath = NULL;
+
+	const char *name;
+	unsigned int namelen;
+
+	/* Don't allow lookups of META-files */
+	namelen = strlen(META_FILENAME);
+	if(namelen == dentry->d_name.len) {
+		if(!strncmp(dentry->d_name.name, META_FILENAME, namelen)) {
+			err = -ENOENT;
+			goto out;
+		}
+	}
+
+	hidden_dir_dentry = dtohd(dentry->d_parent);
+	hidden_sto_dir_dentry = dtohd2(dentry->d_parent);
+
+	name = dentry->d_name.name;
+	namelen = dentry->d_name.len;
+
+	/* must initialize dentry operations */
+	dentry->d_op = &mini_fo_dops;
+
+	/* setup the del_flag */
+	del_flag = __meta_check_d_entry(dir, name, namelen);
+	bpath = __meta_check_r_entry(dir, name, namelen);
+
+	/* perform the lookups of base and storage files:
+	 *
+	 * This caused some serious trouble, as a lookup_one_len passing
+	 * a negative dentry oopses. Solution is to only do the lookup
+	 * if the dentry is positive, else we set it to NULL
+	 * More trouble, who said a *_dir_dentry can't be NULL?
+	 */
+	if(bpath) {
+		/* Cross-Interposing (C), yeah! */
+		hidden_dentry = bpath_walk(dir->i_sb, bpath);
+		if(!hidden_dentry || !hidden_dentry->d_inode) {
+			printk(KERN_CRIT "mini_fo_lookup: bpath_walk failed.\n");
+			err= -EINVAL;
+			goto out;
+		}
+		
+		/* this can be set up safely without fear of spaghetti
+		 * interposing as it is only used for copying times */
+		hidden_dir_dentry = hidden_dentry->d_parent;
+		kfree(bpath);
+	}
+	else if(hidden_dir_dentry && hidden_dir_dentry->d_inode)
+		hidden_dentry = 
+			lookup_one_len(name, hidden_dir_dentry, namelen);
+	else
+		hidden_dentry = NULL;
+
+	if(hidden_sto_dir_dentry && hidden_sto_dir_dentry->d_inode)
+		hidden_sto_dentry = 
+			lookup_one_len(name, hidden_sto_dir_dentry, namelen);
+	else
+		hidden_sto_dentry =  NULL;
+
+	/* catch error in lookup */
+	if (IS_ERR(hidden_dentry) || IS_ERR(hidden_sto_dentry)) {
+		/* mk: we need to call dput on the dentry, whose 
+		 * lookup_one_len operation failed, in order to avoid
+		 * unmount trouble.
+		 */
+		if(IS_ERR(hidden_dentry)) {
+			printk(KERN_CRIT "mini_fo_lookup: ERR from base dentry, lookup failed.\n");
+			err = PTR_ERR(hidden_dentry);
+		} else {
+			dput(hidden_dentry);
+		}
+		if(IS_ERR(hidden_sto_dentry)) {
+			printk(KERN_CRIT "mini_fo_lookup: ERR from storage dentry, lookup failed.\n");
+			err = PTR_ERR(hidden_sto_dentry);
+		} else {
+			dput(hidden_sto_dentry);
+		}
+		goto out;
+	}
+
+	/* allocate dentry private data */
+	__dtopd(dentry) = (struct mini_fo_dentry_info *)
+		kmalloc(sizeof(struct mini_fo_dentry_info), GFP_KERNEL);
+	
+	if (!dtopd(dentry)) {
+		err = -ENOMEM;
+		goto out_dput;
+	}
+
+	/* check for different states of the mini_fo file to be looked up. */
+	
+	/* state 1, file has been modified */
+	if(hidden_dentry && hidden_sto_dentry &&
+	   hidden_dentry->d_inode && hidden_sto_dentry->d_inode && !del_flag) {
+
+		/* update parent directory's atime */
+		fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
+
+		dtopd(dentry)->state = MODIFIED;
+		dtohd(dentry) = hidden_dentry;
+		dtohd2(dentry) = hidden_sto_dentry;
+
+		err = mini_fo_tri_interpose(hidden_dentry,
+					    hidden_sto_dentry,
+					    dentry, dir->i_sb, 1);
+		if (err) {
+			printk(KERN_CRIT "mini_fo_lookup: error interposing (state1).\n");
+			goto out_free;
+		}
+		goto out;
+	}
+	/* state 2, file is unmodified */
+	if(hidden_dentry && hidden_dentry->d_inode && !del_flag) {
+
+		fist_copy_attr_atime(dir, hidden_dir_dentry->d_inode);
+
+		dtopd(dentry)->state = UNMODIFIED;
+		dtohd(dentry) = hidden_dentry;
+		dtohd2(dentry) = hidden_sto_dentry; /* could be negative */
+
+		err = mini_fo_tri_interpose(hidden_dentry,
+					    hidden_sto_dentry,
+					    dentry, dir->i_sb, 1);
+		if (err) {
+			printk(KERN_CRIT "mini_fo_lookup: error interposing (state2).\n");
+			goto out_free;
+		}
+		goto out;
+	}
+	/* state 3, file has been newly created */
+	if(hidden_sto_dentry && hidden_sto_dentry->d_inode && !del_flag) {
+
+		fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
+		dtopd(dentry)->state = CREATED;
+		dtohd(dentry) = hidden_dentry; /* could be negative */
+		dtohd2(dentry) = hidden_sto_dentry;
+
+		err = mini_fo_tri_interpose(hidden_dentry,
+					    hidden_sto_dentry,
+					    dentry, dir->i_sb, 1);
+		if (err) {
+			printk(KERN_CRIT "mini_fo_lookup: error interposing (state3).\n");
+			goto out_free;
+		}
+		goto out;
+	}
+
+	/* state 4, file has deleted and created again. */
+	if(hidden_dentry && hidden_sto_dentry &&
+	   hidden_dentry->d_inode && 
+	   hidden_sto_dentry->d_