changelog

Solaris操作系统下的过滤驱动程序, C源码程序.

2001-10-19  Ion Badulescu  <[e-mail]>

	* mmap.c: added conditional schedule() calls in all while loops,
	to improve latency when doing lots of data movement; allow block
	ciphers, but restrict encoding_blocksize to 1 for now

2001-10-18  Ion Badulescu  <[e-mail]>

	* mmap.c: use __FUNCTION__ in several fist_dprint()'s
	(wrapfs_commit_write): handle all possible cases of
	write-in-the-middle with stream cyphers; disallow block cyphers
	for now; optimize wrapfs_encode_block usage; properly mark our
	inode as dirty

	* main.c: added MODULE_LICENSE("LGPL")

	* fist.h (MODULE_LICENSE): provide stub if not defined elsewhere

2001-10-18  Ion Badulescu  <[e-mail]>

	* mmap.c (wrapfs_get1page): moved here from aux.c, compiled in if
	encoding type is not 'none'
	(wrapfs_do_readpage): clear out the end of an incomplete page
	[fixes one corruption case]
	(wrapfs_commit_write): don't allow holes in an encoded file,
	instead encode them and write them out; deal properly with
	different encoding techniques [fixes another corruption case]

	* all: use PAGE_CACHE_SIZE instead of PAGE_SIZE

	* doit-nfs.sh: use overlay mounts

2001-10-15  Ion Badulescu  <[e-mail]>

	* inode.c (wrapfs_{link,mkdir,mknod}): same fix as for
	wrapfs_symlink below
	(wrapfs_{create,link}): add comment about potential a negative
	dentry being returned by a successful 'create'-type operation, in
	the SCA code

2001-10-12  Ion Badulescu  <[e-mail]>

	* fist.h: fixed problem with MODVERSIONS kernels

2001-10-12  Ion Badulescu  <[e-mail]>

	* main.c (wrapfs_read_super): allow LFS if SCA is not used. Have
	fun with 2GB+ files on cryptfs! :-)

	* wrapfs.h: prototype for wrapfs_dir_iops

	* print.c (fist_PageDecrAfter): deal with yet another
	inconsistency in the Linux VM (fixes problem with 2.4-ac)

	* main.c (wrapfs_interpose): use wrapfs_dir_fops for directories
	(wrapfs_parse_options): don't crash if the underlying directory
	doesn't exist

	* inode.c (wrapfs_symlink): don't interpose if the hidden_dentry
	is negative, d_drop our dentry instead (fixes problem when
	stacking over NFSv2)
	(wrapfs_dir_iops): new set of inode ops for directories only;
	(wrapfs_symlink_iops, wrapfs_main_iops): drastically reduced set
	of inode ops (fixes "can cd into file" problem)

	* fist.h: linux/malloc.h is deprecated, use linux/slab.h instead

	* file.c (wrapfs_ioctl): return ENOTTY for non-existant ioctl's
	(fixes problem with 'tar -z')

2001-10-08  Erez Zadok  <[e-mail]>

	* Makefile: set TOPINC to best known system headers.  Optionally
	include fistdev.mk if it exists, allowing fistgen developers to
	override the value of TOPINC.

2001-10-04  Erez Zadok  <[e-mail]>

	* main.c (wrapfs_read_super): avoid dereferencing NULL pointer if
	stopd() is NULL (b/c the mount command failed to include a "-o
	dir=" option).

	* print.c (fist_print_sb): sb->s_active and s_count only exist in
	2.4.8 and newer.

2001-10-01  Erez Zadok  <[e-mail]>

	* main.c (wrapfs_read_super): bug fix: copy hidden superblock
	s_blocksize and s_blocksize_bits.  Now 2.2 kernels can execute
	binaries greater than one page.  (Yes, it's entirely non-obvious
	what the fix has to do with the bug, yet 2 man days were wasted on
	this bug.)

	* print.c: set default debug level to 18 (max) so we can see a few
	debugging messages before fist_ioctl has a chance to reset the
	debugging level.

	* main.c (wrapfs_read_super): print superblock and hidden
	superblock on exit.

	* print.c (fist_print_sb): new function

2001-09-29  Ion Badulescu  <[e-mail]>

	* inode.c (wrapfs_rmdir): no need to set i_nlink to 0 here, it is
	done (properly) in wrapfs_put_inode()

2001-09-29  Erez Zadok  <[e-mail]>

	* inode.c (wrapfs_unlink): no need to special-case if err==ENOENT,
	because we're now handling negative dentries correctly
	(wrapfs_rmdir): ditto

	* super.c (wrapfs_put_inode): ->put_inode() becomes a mandatory
	op, because of NFS (which doesn't really unlink files, but renames
	them to .nfsXXX).  If our inode->i_count is 1, we force ->i_nlink
	to 0, to ensure that iput() will drop our reference to the hidden
	inode upon freeing us.

2001-09-29  Ion Badulescu  <[e-mail]>

	* wrapfs.h (fist_copy_attr_all): copy i_rdev between hidden_inode
	and our inode

2001-09-29  Erez Zadok  <[e-mail]>

	* print.c (fist_print_page_flags): PageSwapCache() needs a kernel
	symbol on 2.4.10 that isn't exported.

2001-09-29  Ion Badulescu  <[e-mail]>

	Fixes to make "cat ." (or any other directory) fail:

	* super.c (wrapfs_read_inode): use wrapfs_main_iops and
	wrapfs_main_fops

	* main.c (wrapfs_interpose): change i_fops to wrapfs_dir_fops for
	directories
	(__wrapfs_hidden_dentry): use wrapfs_main_iops and
	wrapfs_main_fops

	* inode.c (wrapfs_symlink_iops): renamed from wrapfs_iops_symlink
	(wrapfs_main_iops): renamed from wrapfs_iops

	* file.c (wrapfs_read, wrapfs_write): remove ifdef's around them,
	they are used for directories; fixed some comments in
	wrapfs_write;
	(wrapfs_dir_fops): new file_operations structure for directories
	(wrapfs_main_fops): renamed from wrapfs_fops

2001-09-29  Erez Zadok  <[e-mail]>

	* print.c (fist_print_buffer_flags): buffer_protected() doesn't
	exist in 2.4.10 (big VM changes)

2001-09-29  Ion Badulescu  <[e-mail]>

	* inode.c (wrapfs_permission): use vfs_permission() instead of our
	own concocted subset of it

2001-09-29  Erez Zadok  <[e-mail]>

	* fist_ioctl.c: include string.h

	* dentry.c (wrapfs_d_delete): add parentheses around assignment
	inside a condition, plus a printf

2001-09-29  Ion Badulescu  <[e-mail]>

	Changes that eliminate the need for a kernel patch:

	* file.c (wrapfs_open): massage flags to include read access to
	the hidden file, if we are filtering data; call dentry_open() with
	only two args

	* aux.c (wrapfs_idx_open): call dentry_open() with only two args;
	remove one of the function's own arguments as well

	* inode.c (wrapfs_truncate_and_enlarge): ditto; also call
	wrapfs_idx_open() with only two args, due to the dentry_open()
	change

	* mmap.c: copied sync_page() from mm/filemap.c, because it's not
	an exported function

	* main.c (wrapfs_read_super): initialize sb->s_maxbytes for both
	2.4.[23], to catch the RH 2.4.2-2 kernel (which is really a
	2.4.3-pre kernel and thus needs that change)

2001-09-29  Ion Badulescu  <[e-mail]>

	* dentry.c (wrapfs_d_delete): a dentry could have no private data,
	don't dereference blindly

	* inode.c (wrapfs_lookup): added a comment about "weird" dentries
	(without either d_inode or private data)

	* Makefile (TOPINC): use /lib/modules/<uname -r>/build/include

	* ALL: minor updates to support kernels up to 2.4.9

2001-03-22  Erez Zadok  <[e-mail]>

	* main.c (wrapfs_read_super): Linux 2.4.2-ac3 and beyond has code
	 in mm/filemap.c:generic_file_write() that requires sb->s_maxbytes
	 to be populated.  If not set, all write()s under that sb will
	 return 0.  Patch from Paul Walmsley <[e-mail]>.
	 (wrapfs_read_super): for now, set s_maxbytes to MAX_NON_LFS, b/c
	 we don't yet support file systems with files larger than 2GB.

2000-05-24  Erez Zadok  <[e-mail]>

	* inode.c (wrapfs_unlink): call d_delete() because dput() does
	that too.
	(wrapfs_rmdir): call d_delete() because dput() does
	that too.
	(wrapfs_truncate_and_enlarge): call mntget() before dentry_open()
	because it will decrement the mnt's refcount if error, and fput()
	will do an mntput() for us upon file close.

	* file.c (wrapfs_open): call mntget() before dentry_open() because
	it will decrement the mnt's refcount if error, and fput() will do
	an mntput() for us upon file close.

	* dentry.c (wrapfs_d_delete): fully implement d_delete, and have
	it call the lower file system's ->d_delete method if the latter
	has one.  This is needed since 2.3.99-pre9 changed dput() and now
	have dput() call d_delete() and ->d_drop.

	* aux.c (wrapfs_idx_open): call mntget() before dentry_open()
	because it will decrement the mnt's refcount if error, and fput()
	will do an mntput() for us upon file close.
	(wrapfs_idx_set_entry): bug fix.  move holes support code outside
	the previous "if" statement, which had nothing to do holes.

2000-05-16  Erez Zadok  <[e-mail]>

	* inode.c (wrapfs_truncate_and_enlarge): call mntget since we've
	called dentry_open().

	* aux.c (wrapfs_idx_open): call mntget since we've called
	dentry_open().

	* file.c (wrapfs_open): use ftohf() not file->private_data.
	(wrapfs_open): call mntget(hidden_file->f_vfsmnt) else we BUG() in
	wrapfs_release() when it calls fput(hidden_file).

	* mmap.c: All calls to ->readpage, ->writepage, wrapfs_get1page,
	and read_cache_page changed to pass file instead of dentry.

	* inode.c (wrapfs_truncate_and_enlarge): use fake a struct file so
	we can pass it to wrapfs_get1page (which absolutely needs it).  An
	ugly hack because notify_change doesn't take a struct file and it
	isn't that easy to make it do so.

	* aux.c (wrapfs_get1page): now takes a file, not dentry.  All
	calls to ->readpage and read_cache_page changed to pass file
	instead of dentry.

2000-05-16  Erez Zadok  <[e-mail]>

	* mmap.c (wrapfs_writepage): ->writepage doesn't take struct
	dentry any more (2.3.99-pre7).

	* main.c (wrapfs_parse_options): walk_init renamed to path_init in
	2.3.99-pre7. 
	(wrapfs_parse_options): walk_name renamed to path_walk.

2000-05-10  Erez Zadok  <[e-mail]>

	* Makefile: define TOPINC for special -I flags, to avoid bad
	header inclusions with just a -I<null> option.

2000-05-01  Erez Zadok  <[e-mail]>

	* sca_aux.c, sca_aux.h, sca_list_idx.c, sca_mk_idx.c, sca_read.c,
	sca_write.c: SCA support user-level files to print an index file,
	recover it, decode a file, and encode a file.  These files are
	generated only if SCA code is on.

	* aux.c (wrapfs_{read,write}_file): filp_open doesn't need 4th
	arg.

2000-04-30  Erez Zadok  <[e-mail]>

	* mmap.c (wrapfs_sync_page): define new method sync_page.

2000-04-30  Erez Zadok  <[e-mail]>

	* mmap.c (wrapfs_writepage): now takes an extra argument, struct
	file (2.3.99-pre6).  Let's hope that it can never be NULL.

2000-04-24  Ion Badulescu  <[e-mail]>

	* inode.c (wrapfs_rmdir): handle cases where the file/dir is
	removed through the hidden fs

2000-04-24  Ion Badulescu  <[e-mail]>

	Updated to 2.3.99-pre6-pre5:

	* wrapfs.h: added hidden_mnt to struct wrapfs_sb_info

	* super.c (wrapfs_put_super): mntput() the hidden_mnt; #ifdef
	FIST_DEBUG the delete_inode() method, as it's not needed anymore

	* main.c (wrapfs_interpose): use wrapfs_iops_symlink if the inode
	is a symlink