changelog

Solaris操作系统下的过滤驱动程序, C源码程序.

2003-02-09  Charles P. Wright  <[e-mail]>

	* mmap.c, super.c, subr.c: testing for kmalloc return values.

	* main.c (wrapfs_read_super): Return value of kmalloc was not checked.

2003-01-20  Erez Zadok  <[e-mail]>

	* super.c (wrapfs_read_inode): comment out the FS_REQUIRES_DEV dev
	code because it could cause an oops.  Add a new comment that
	explains how to export a nodev file system: use nfs-utils 1.0 or
	later, and 2.4.20 or newer with the "fsid=" export parameter.

	* file.c (wrapfs_write): check if ->write() op exists, not if
	->read() exists.  Bug report from Jerome de Vivie
	<[e-mail]>.

2002-12-27  Erez Zadok  <[e-mail]>

	* super.c (wrapfs_read_inode): To export a file system via NFS, it
	has to have the FS_REQUIRES_DEV flag, so turn it on.  But should
	we inherit the flag from the lower file system, or can we allow
	our file system to be exported even if the lower one cannot be
	natively exported.

2002-11-02  Charles P. Wright  <[e-mail]>

	* wrapfs.h,file.c: Added per file private data structure
	(can be accessed through ftopd(file)) and modified appropriate
	macros.
2002-10-07  Charles P. Wright  <[e-mail]>

	* super.c (wrapfs_umount_begin): Do not pass umount_begin down
	to lower file-system when using attach mode.

2002-09-21  Charles P. Wright  <[e-mail]>

	* main.c (wrapfs_interpose): Run init_special_inode with modes
	from lower inode rather than uninitialized upper inode.

2002-04-07  Kiran-Kumar Muniswamy-Reddy  <[e-mail]>

	* mmap.c (wrapfs_commit_write): SCA code - fixed mtime and 
	ctime of lower layer not being updated

2002-04-03  Erez Zadok  <[e-mail]>

	* main.c (wrapfs_interpose): bug fix.  Run create_special_inode()
	on our inode only if the hidden_inode is special.

2002-04-02  Kiran-Kumar Muniswamy-Reddy  <[e-mail]>

	* file.c (wrapfs_read): fix for atime not being updated
	for reads of size zero
	(wrapfs_write): fix for ctime and mtime of upper layer not
	being updated

2002-04-01  Kiran-Kumar Muniswamy-Reddy  <[e-mail]>

	* mmap.c (wrapfs_commit_write): fix for lower layer's 
	mtime and ctime not being synced with upper layer's
	mtime and ctime
	(wrapfs_writepage): fix for lower layer's mtime and 
	ctime not being synced with upper layer's mtime and 
	ctime

	* file.c (wrapfs_read_update_atime): added function for updating
	atime of lower level filesystem

2002-03-30  Erez Zadok  <[e-mail]>

	* file.c (wrapfs_llseek): fix fist_print_* call prototypes in SCA
	code.

	* main.c (wrapfs_parse_options): advance options pointer to the
	next comma-delimited option.

2002-03-29  Erez Zadok  <[e-mail]>

	* main.c (wrapfs_interpose): for fist-lite, fix our inode's a_ops
	to that of the hidden inode.  Another hack.

	* super.c (wrapfs_read_inode): for fist-lite, intialize inode's
	a_ops to wrapfs_empty_aops (essentially all NULL ops).

	* file.c (wrapfs_main_fops): for fist-lite, define our own read,
	write, and mmap methods.
	(wrapfs_read): method for fist-lite.
	(wrapfs_write): method for fist-lite.
	(wrapfs_read): method for fist-lite.
	(wrapfs_mmap): method for fist-lite.  A hack to circumvent VFS
	deficiencies.  Force vma's vm_file to be hidden_file, then fix
	refcounts on file and hidden-file.

	* main.c (wrapfs_interpose): initialize special inodes (devices,
	fifos, sockets) properly.  Patch from David Chow
	<[e-mail]>.

2002-03-29  Charles P. Wright <[e-mail]>

	* attach.c: count number of attachments in vfsmount structure,
	add return type to delete_entry, permissions checking on
	detach, detach will d_drop and dput the from point.

2002-03-25  Erez Zadok  <[e-mail]>

	* main.c (wrapfs_iunique): include this code only if
	FIST_DYNAMIC_INODE_NUMBERS is on.  Minor code re-indenting to
	match style.

	* wrapfs.h: use extern on wrapfs_iunique() and make sure it's
	defined only if FIST_DYNAMIC_INODE_NUMBERS is on.

2002-03-25  Charles P. Wright  <[e-mail]>

	* wrapfs.h: changed attached_ent structure to have dentry
	instead of name and length, changed to use <linux/list.h>
	list rather than own singly linked implementation.

	* wrapfs.h: Added fields to private data structure for attach
	list and lock.  It may be appropriate to change this to a
	special structure just for the root of an attach mode fs.

	* attach.c: use new attached_ent structure, in readdir
	will use dynamic inodes instead of numbers 17 and onwards.
	Fixed oops having to do with putnami'ng invalid name,
	on error in fist_attach_ioctl.  Added minimal detach support.

	* super.c: will not mntput (stopd(sb)->hidden_mnt) on 
	unmount of MNTSTYLE_ATTACH filesystem (hidden_mnt) does not
	exist for these mounts)

	* main.c: wrapper function to iunique that complains if the
	numbers begin to wrap around on us.

2002-03-24  Kiran-Kumar Muniswamy-Reddy  <[e-mail]>

	* mmap.c (wrapfs_fill_zeros): function for handling sparse files. 

	(wrapfs_commit_write): This function was already handling sparse
	files, but was not zeroing out appropriate regions of new
	allocated disk blocks.  Added code that zeroes out the appropriate
	portions of new allocated disk blocks.  The code for this was
	enclosed in a #ifndef FIST_ENCODING_TYPE_NONE, removed the #ifndef
	since the code will be needed for all filesystems.
	(wrapfs_get1page): was enclosed in #ifndef FIST_ENCODING_NONE,
	removed the #ifndef since it is called from wrapfs_truncate, which
	is invoked for truncates that extend the file for non-SCA
	filesystems
	
	* inode.c (wrapfs_truncate): function to handle truncations that
	extend the size of the file -- for non-SCA filesystems
	(wrapfs_setattr): added a call to wrapfs_truncate for truncate on
	non-SCA filesystems.

	* wrapfs.h: added the declaration for wrapfs_fill_zeros, required
	by wrapfs_truncate.

2002-03-24  Erez Zadok  <[e-mail]>

	* wrapfs.h: change {en,de}code_block extern to include pagenum.

	* subr.c (wrapfs_{de,en}code_block): ditto

	* mmap.c (wrapfs_do_readpage, wrapfs_commit_write,
	wrapfs_writepage): pass page number to encode/decode_block.

	* main.c (wrapfs_interpose): call iunique() if
	dynamic_inode_numbers is on.
	(wrapfs_read_super): avoid __FUNCTION__ in calls to fist_print_*.

2002-03-23  Charles P Wright <[e-mail]>

	* attach.c: do_attach will not Oops if the attach point does
	not exist.  do_attach checks if object to be attached is a
	directory with read and execute permissions.  do_attach
	checks mount permissions.

2002-03-19  Ion Badulescu  <[e-mail]>

	* main.c (wrapfs_parse_options): use simple_strtoul() instead of
	simple_strtol()

2002-03-18  Ion Badulescu  <[e-mail]>

	* print.c (fist_set_debug_value): print the new debug level when
	changing it; move fist_debug_var outside of FIST_DEBUG

	* main.c: moved MODULE_PARM(fist_debug_var) from print.c

	* ALL: use __FUNCTION__ as if it were a function, not a string
	macro, to appease gcc3.

2002-03-16  Charles P Wright <[e-mail]>

	* Move all initialization of declared automatic variables in all
	functions to after the call to print_entry_location().  This helps
	debug bugs and problems that result in NULL/bad pointer
	dereferencing.

2002-03-09  Erez Zadok  <[e-mail]>

	* wrapfs.h: add a new field to the wrapfs superblock private
	information.  This is a pointer to the head of the list of
	attached nodes.
	Define externs for attach-related functions.

	* wrapfs.h: define attached_entry data structure, used for a
	linked list of nodes attached to the mount point.

	* print.c (fist_print_dentry): print d_op address, to see if we
	have dentry ops at all.

	* main.c (wrapfs_interpose): attach code should not check hidden
	super_block. on the top-level attach node because it doesn't have
	a hidden super_block.
	(__wrapfs_hidden_dentry): check for attach's allowed dops and iops

	* fist_ioctl.c: support calls to new attach ioctls.  Some
	restructuring of the code.

	* fist.h (FIST_IOCTL_[AD]ETACH): define two new ioctls.  One to
	attach and one to detach.

	* README.attach: text file explaining motivation and use of attach
	mode.

	* attach.c: new file includes the vast majority of attach-mode
	code.

	* Beginning of attach-mode code.  Just barely working.

2002-02-21  Erez Zadok  <[e-mail]>

	* super.c (wrapfs_statfs): don't compile this ->statfs() function
	when attach mode is used.  We have a different version in
	attach.c.

	* main.c (wrapfs_interpose): comments how we might handle dynamic
	inode number generation in wrapfs().
	(__wrapfs_hidden_dentry): use ASSERT2().
	(wrapfs_parse_options): document parse_options function.
	(wrapfs_read_super): this version of ->read_super() is not used
	when attach-mode is on.

	* wrapfs.h (fist_copy_attr_all): copy i_blkbits as well.

	* fist.h (ASSERT2): version of ASSERT that prints the info about
	the caller of the function which triggered the assertion.  Useful
	to track which function caused wrapfs_hidden_*() to fail.

2002-02-17  Erez Zadok  <[e-mail]>

	* wrapfs.h (WRAPFS_SUPER_MAGIC): define superblock magic for fist
	file systems.

	* print.c (fist_print_inode): print i_mode as well.

2002-02-03  Ion Badulescu  <[e-mail]>

	* main.c (wrapfs_parse_options): added mount option "debug=%d" for
	setting the debug level at mount time
	added MODULE_DESCRIPTION()

	* print.c: changed default debug level to 0; added
	MODULE_PARM(fist_debug_var)

	* file.c (wrapfs_poll): return DEFAULT_POLLMASK if the underlying
	fs doesn't have a poll() method [patch from Marc Boucher

	* fist.h: define DEFAULT_POLLMASK if not already defined

2002-02-02  Erez Zadok  <[e-mail]>

	* file.c (wrapfs_ioctl): don't fail ioctls by default, unless we
	know for sure that they are unknown.  Otherwise, cryptfs code
	returns a failure even after setting the cipher key correctly.
	Plus, the default behavior for wrapfs_ioctl() for all other OSs
	(freebsd and solaris) is to succeed by default unless the ioctl is
	unknown.

2001-12-26  Ion Badulescu  <[e-mail]>

	* mmap.c (wrapfs_writepage): disable writepage() for SCA, because
	It Can Not Possibly Work(TM).

2001-12-04  Ion Badulescu  <[e-mail]>

	* fist.h: defined SEEK_{SET,CUR,END} if not defined, this is
	needed for David's code below to even compile (which makes me
	wonder if he's ever tested it)

2001-11-05  David Chow <[e-mail]>

	* file.c (wrapfs_llseek): Added boundary checks for SCA.  Fix
	position problem for SCA llseek.  Since SCA doesn't not align with
	the hidden file.  Only equate the hidden fpos to virtual fpos for
	non-SCA fs.  Also fix.
	This patch was applied by Erez, but untested.

2001-10-26  Ion Badulescu  <[e-mail]>

	* main.c: include <linux/module.h> last

	* fist.h: include <linux/init.h> here

	* main.c, fist.h: moved the MODULE_LICENSE definition to main.c