209-mini_fo.patch

Linux Home Server 是专门为家庭和SOHO/SMB 设计的高性价比的ISCSI 存储服务器, 具有如下的特色： 强大的iscsi 存储服务器软件； 混合iscsi 和NAS 服务；

+	mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
+#else
+	down(&hidden_sto_dir_dentry->d_inode->i_sem);
+#endif
+	/* lets be safe */
+	if(dtohd2(dir) != hidden_sto_dir_dentry) {
+		printk(KERN_CRIT "mini_fo: build_sto_structure: invalid parameter or meta data corruption [2].\n");
+		return 1;
+	}
+
+	/* check for errors in lock_parent */
+	err = PTR_ERR(hidden_sto_dir_dentry);
+	if(IS_ERR(hidden_sto_dir_dentry)) {
+		printk(KERN_CRIT "mini_fo: build_sto_structure: lock_parent failed.\n");
+		return err;
+	}
+
+	err = vfs_mkdir(hidden_sto_dir_dentry->d_inode,
+			hidden_sto_dentry,
+			dir->d_inode->i_mode);
+
+	if(err) {
+		printk(KERN_CRIT "mini_fo: build_sto_structure: failed to create storage dir [1].\n");
+		/* was: unlock_dir(dir); */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
+		mutex_unlock(&dir->d_inode->i_mutex);
+#else
+		up(&dir->d_inode->i_sem);
+#endif
+		dput(dir);
+		return err;
+	}
+	
+	/* everything ok! */
+	if(!dtohd2(dentry)->d_inode) {
+		printk(KERN_CRIT "mini_fo: build_sto_structure: failed to create storage dir [2].\n");
+		/* was: unlock_dir(dir); */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
+		mutex_unlock(&dir->d_inode->i_mutex);
+#else
+		up(&dir->d_inode->i_sem);
+#endif
+		dput(dir);
+		return 1;
+	}
+
+	/* interpose the new inode and set new state */
+	itohi2(dentry->d_inode) = igrab(dtohd2(dentry)->d_inode);
+	dtopd(dentry)->state = MODIFIED;
+
+	/* initalize the wol list */
+	itopd(dentry->d_inode)->deleted_list_size = -1;
+	itopd(dentry->d_inode)->renamed_list_size = -1;
+	meta_build_lists(dentry);
+	
+	fist_copy_attr_all(dentry->d_inode, itohi2(dentry->d_inode));
+	fist_copy_attr_timesizes(dir->d_inode, 
+				 hidden_sto_dir_dentry->d_inode);
+	dir->d_inode->i_nlink++;
+	/* was: unlock_dir(hidden_sto_dir_dentry); */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
+	mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
+#else
+	up(&hidden_sto_dir_dentry->d_inode->i_sem);
+#endif
+	dput(hidden_sto_dir_dentry);
+	return 0;
+}
+
+
+#if 0 /* unused */
+
+/*
+ * Read "len" bytes from "filename" into "buf".
+ * "buf" is in kernel space.
+ */
+int
+mini_fo_read_file(const char *filename, void *buf, int len)
+{
+    file_t *filp;
+    mm_segment_t oldfs;
+    int bytes;
+    /* Chroot? Maybe NULL isn't right here */
+    filp = filp_open(filename, O_RDONLY, 0);
+    if (!filp || IS_ERR(filp)) {
+	printk("mini_fo_read_file err %d\n", (int) PTR_ERR(filp));
+	return -1;  /* or do something else */
+    }
+
+    if (!filp->f_op->read)
+	return -2;  /* file(system) doesn't allow reads */
+
+    /* now read len bytes from offset 0 */
+    filp->f_pos = 0;		/* start offset */
+    oldfs = get_fs();
+    set_fs(KERNEL_DS);
+    bytes = filp->f_op->read(filp, buf, len, &filp->f_pos);
+    set_fs(oldfs);
+
+    /* close the file */
+    fput(filp);
+
+    return bytes;
+}
+
+
+
+/*
+ * Write "len" bytes from "buf" to "filename"
+ * "buf" is in kernel space.
+ */
+int
+mini_fo_write_file(const char *filename, void *buf, int len)
+{
+    file_t *filp;
+    mm_segment_t oldfs;
+    int bytes;
+				/* Chroot? Maybe NULL isn't right here */
+    filp = filp_open(filename, O_RDWR|O_CREAT, 0640);
+    if (!filp || IS_ERR(filp)) {
+	printk("mini_fo_write_file err %d\n", (int) PTR_ERR(filp));
+	return -1;  /* or do something else */
+    }
+
+    if (!filp->f_op->write)
+	return -2;  /* file(system) doesn't allow writes */
+
+    /* now write len bytes from offset 0 */
+    filp->f_pos = 0;		/* start offset */
+    oldfs = get_fs();
+    set_fs(KERNEL_DS);
+    bytes = filp->f_op->write(filp, buf, len, &filp->f_pos);
+    set_fs(oldfs);
+
+    /* close the file */
+    fput(filp);
+
+    return bytes;
+}
+
+#endif /* unused */
+
Index: linux-2.6.21.7/fs/mini_fo/ChangeLog
===================================================================
--- /dev/null
+++ linux-2.6.21.7/fs/mini_fo/ChangeLog
@@ -0,0 +1,281 @@
[phone]  Markus Klotzbuecher  <[e-mail]>
+
+	* Add tons of ugly ifdefs to Ed L. Cashin's mutex patch to
+          retain backwards compatibility.
+	
[phone]  Ed L. Cashin <[e-mail]>
+
+	* Support for the new mutex infrastructure
+	(7892f2f48d165a34b0b8130c8a195dfd807b8cb6)
+
[phone]  Markus Klotzbuecher  <[e-mail]>
+
+	* Bugfix for a serious memory leak in mini_fo_follow_link.
+
[phone]  Markus Klotzbuecher  <mk@mary>
+
+	* new release 0.6.1
+
+	* fix of a compiler warning due to changes in 2.6.13
+
[phone]  Klaus Wenninger  <[e-mail]>
+
+	* file.c: readdir: fix for a bug that caused directory entries
+          to show up twice when using storage filesystems such as
+          minixfs or pramfs.
+
[phone]  Eric Lammerts <[e-mail]>
+
+	* fix for an oops when overwriting a binary thats beeing
+          executed.
+
[phone]    <mk@mary>
+
+	* Renamed overlay to mini_fo-overlay.
+
+	* Added mini_fo-merge script to allow merging of storage and base
+	after making modifications.
+
[phone]  root  <mk@mary>
+
+	* Added overlay script that allows to easily mount mini_fo ontop
+	of a given base directory
+
[phone]    <mk@mary>
+
+	* inode.c: xattr functions return -EOPNOSUPP instead of
+          -ENOSUPP, what confuses "ls -l"
+
+	* Changed license from LGPL to GPL.
+
[phone]  root  <mk@mary>
+
+	* Makefile: clean it up and added make install and make
+          uninstall.
+	
[phone]    <mk@mary>
+
+	* merged devel branch back to main. [v0-6-0-pre3]
+
+	* removed unused files print.c and fist_ioctl. [devel-0-0-18]
+
+	* ioctl: removed fist_ioctl stuff, that is not needed for
+          now.
+
[phone]    <mk@mary>
+
+	* file.c: simplified mini_fo_open and mini_fo_setattr using
+          new state changing functions. [devel-0-0-17]
+
+	* inode.c: Fixed getattr state bug (see below) in 2.4 function
+          mini_fo_inode revalidate.
+
+	* inode.c: found an other bug in mini_fo_getattr. States are not
+	  reliable in this function, as a file can be opened, unlinked and
+	  the getattr function called. This results in a deleted dentry
+	  with an inode. Fix is to ignore states and simply use the inode
+	  available.
+
[phone]    <mk@mary>
+
+	* file.c: Bugfix and cleanup in fasync and fsync. [devel-0-0-16]
+
+	* file.c: do not use mini_fo_lock so the generic version is
+          used (I guess).
+
+	* inode.c: getattr, never call getattr on lower files, as this
+          will cause the inum to change.
+
+	* inode.c: rename_reg_file renamed to rename_nondir, as it
+          doesn't matter as long it't not a dir. Removed all
+          rename_dev_file etc. 	  
+
+	* tagged as devel-0-0-15
+
+	* inode.c: added support for chosing support for extended
+          attrs at compile time by XATTR define in mini_fo.h .
+
+	* inode.c: fixed mini_fo_getattr to use mini_fo inode and not
+          lower again, what avoids inode number changes that confused
+          rm again. This is the proper solution.
+
[phone]    <mk@mary>
+
+	* all files: updated Copyright notive to 2005. [devel-0-0-14]
+
+	* inode.c: fixed mini_fo_getattr to not change the inode
+          number, even if lower files change.
+
+	* super.c: fixed a bug that caused deleted base file to show
+          up suddenly after some time, or after creating a special
+          file. The problem was that after some time or after special
+          file creating sync_sb_inodes is called by the vfs, that
+          called our mini_fo_put_inode. There was (wrongly) called
+          __meta_put_lists, that nuked the lists, although the inode
+          was going to continue its life. Moving __meta_put_lists to
+          mini_fo_clear_inode, where an inode is really destroyed,
+          solved the problem.
+
+
[phone]    <mk@mary>
+
+	* state.c, aux.c: more cleaning up and
+          simplifications. [devel-0-0-13] 
+
+	* inode.c: implemented mini_fo_getattr, that was required for
+          2.6 because inode_revalidate has been remove there, and the
+	  old "du" bug returned.
+
+
[phone]    <mk@mary>
+
+	* aux.c: get_neg_sto_dentry(): allow to be called for dentries
+          in state UNMODIFIED, NON_EXISTANT _and_ DELETED.
+
[phone]    <mk@mary>
+
+	* Fixed a bug under 2.6 that caused files deleted via mini_fo
+          not to be deleted properly and therefore the fs filled up
+          untill no memory was left. [devel-0-0-12]
+
+	* Added basic hard link support. This means that creating
+          hardlinks will work, but existing ones will be treated as
+          individual files. [devel-0-0-11]
+
[phone]    <mk@mary>
+
+	* Bugfixes
+
[phone]  root  <mk@mary>
+
+	* Added file state.c for the state transition
+          functions. Doesn't work very well yet, though...
+
[phone]    <mk@mary>
+
+	* Porting to 2.6 started, which is easier than expected, also
+          due to Olivier previous work.
+
[phone]    <mk@mary>
+
+	* Fixed the bug that caused du to return invalid sizes of
+          directory trees. The problem was that
+          mini_fo_inode_revalidate didn't always copy the attributes
+          from the base inode properly.
+
[phone]  Markus Klotzbuecher  <mk@chasey>
+
+	* Merged devel branch back to main trunk and updated the
+          RELEASE notes. This will be 0-6-0-pre1.
+
[phone]  Markus Klotzbuecher  <mk@chasey>
+
+	* Fixed some bugs in rename_reg_file, that only showed up in
+          the kernel compile test. Kernel compiles cleanly ontop of
+          mini_fo, now also make mrproper etc. work. Seems pretty stable.
+
[phone]  Markus Klotzbuecher  <mk@chasey>
+
+	* Many, many directory renaming bugfixes and a lot of other
+          cleanup. Dir renaming seems to work relatively stable.
+
[phone]  Markus Klotzbuecher  <mk@chasey>
+
+	* Finished implementing lightweight directory renaming. Some
+          basic testing indicates it works fine.
+	  Next is to implement testcases for the testsuite and confirm
+          everything is really working ok.
+
[phone]  Markus Klotzbuecher  <mk@chasey>
+
+	* Finished implementing meta.c stuff required for directory
+          renaming.
+
[phone]  Markus Klotzbuecher  <mk@chasey>
+
+	* Fixed all compile warnings + an extremly old bug that
+          somehow crept in while reworking the wol stuff to the META
+          system. Turning on -Werror again... :-)
+
+	* Fixed some bugs in the new rename_reg_file function.
+
+	* Rewrote mini_fo rename and split it into several
+          subfunctions, that handle the different types
+          seperately. Rewrote the regular file function aswell, as it
+          was implemented somewhat inefficient. 
+
[phone]  Markus Klotzbuecher  <mk@chasey>
+
+	* Implemented new META subsystem, removed old WOL stuff in favor 
+	  if it.
+
+	* After some basic testing everything seems ok...
+
[phone]  Markus Klotzbuecher  <mk@chasey>
+
+	* Renaming a non regular file caused trouble because I always
+	  tried to copy the contents. Now I only do this for regular
+	  files. mini_fo_rename still isn't implemented properly, renaming
+	  of device files, symlinks etc. results in a empty regular file
+	  instead of the proper type.
+	
+	* Directory renaming suddenly works! What a surprise! I guess
+          this is because renaming is implemented as making a copy and
+          removing the original. Still this might not work
+          everywhere...
+
[phone]  Markus Klotzbuecher  <mk@chasey>
+
+	* Bugfix, when a mini_fo directory that exists in storage
+  	  (state: MODIFIED, CREATED and DEL_REWRITTEN) is deleted, a
+  	  possibly existing WOL file contained in it needs to be
+  	  deleted too.
+
+	* Starting cleanup: defined state names in order to get rid of
+          the state numbers.
+
[phone]  Markus Klotzbuecher  <mk@chasey>
+	
+	* Makefile fix, fist_ioctl was built against wrong sources if ARCH=um
+
+	* Fixed a bug in dentry.c, mini_fo_d_hash. In state 4 =
+          DEL_REWRITTEN the hash was calculated from the base dentry,
+          which was wrong and and caused assertions in
+          __mini_fo_hidden_dentry to fail.
+
[phone]    <mk@mary>
+
+	* Implemented directory deleting (inode.c)
+
+	* main.c: made mini_fo_parse_options a little more robust.
+
[phone]    <mk@mary>
+
+	* Makefile cleanup and uml stuff, removed unneccessary files
+
+	* Created a new and hopefully more informative README
+
+	* CHANGELOG: created a new CHANGELOG and added old entries reversely
+
+
[phone] Gleb Natapov <[e-mail]>
+
+	* Fix: owner and group where not correctly copied from base to
+          storage. 
+
+
[phone] Gleb Natapov <[e-mail]>
+
+	* Implementation of fsync, fasync and lock mini_fo functions.
+	
+
[phone] Bob Lee <[e-mail]>
+
+	* Fix of a serious pointer bug
+	
+
[phone] Gleb Natapov <[e-mail]>
+
+	* Implementation of mini_fo_mknod and mini_fo_rename, support
+          for device files.
+	
Index: linux-2.6.21.7/fs/mini_fo/dentry.c
===================================================================
--- /dev/null
+++ linux-2.6.21.7/fs/mini_fo/dentry.c
@@ -0,0 +1,244 @@
+/*
+ * 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"
+
+/*
+ * THIS IS A BOOLEAN FUNCTION: returns 1 if valid, 0 otherwise.
+ */
+STATIC int
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+mini_fo_d_revalidate(dentry_t *dentry, struct nameidata *nd)