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NetBSD/sys/miscfs/genfs/genfs_node.h

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fix a bug of lfs. genfs_getpages() can read in more blocks than it should due to faked filesize of lfs_gop_size(). it's a security problem and it makes gcc3 "internal error" to fix this, - in genfs_getpages(), always calculate diskeof and memeof separately so that filesystems (in this case, lfs) can use different strategies for them. - introduce GOP_SIZE_MEM flag and use it to request in-core filesize. (it was an intention of GOP_SIZE_READ, but after the above change _READ is not a straightforward name) after this, no one uses GOP_SIZE_{READ,WRITE} anymore but leave them for now.
2003-09-24 14:22:53 +04:00
/* $NetBSD: genfs_node.h,v 1.5 2003/09/24 10:22:53 yamt Exp $ */
interfaces and structures used by new genfs_{get,put}pages().
2001-09-16 01:33:05 +04:00
/*
* Copyright (c) 2001 Chuck Silvers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Chuck Silvers.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _MISCFS_GENFS_GENFS_NODE_H_
#define _MISCFS_GENFS_GENFS_NODE_H_
add a forward decl for struct vm_page.
2001-09-16 02:38:40 +04:00
struct vm_page;
interfaces and structures used by new genfs_{get,put}pages().
2001-09-16 01:33:05 +04:00
struct genfs_ops {
Add code to UBCify LFS. This is still behind "#ifdef LFS_UBC" for now (there are still some details to work out) but expect that to go away soon. To support these basic changes (creation of lfs_putpages, lfs_gop_write, mods to lfs_balloc) several other changes were made, to wit: * Create a writer daemon kernel thread whose purpose is to handle page writes for the pagedaemon, but which also takes over some of the functions of lfs_check(). This thread is started the first time an LFS is mounted. * Add a "flags" parameter to GOP_SIZE. Current values are GOP_SIZE_READ, meaning that the call should return the size of the in-core version of the file, and GOP_SIZE_WRITE, meaning that it should return the on-disk size. One of GOP_SIZE_READ or GOP_SIZE_WRITE must be specified. * Instead of using malloc(...M_WAITOK) for everything, reserve enough resources to get by and use malloc(...M_NOWAIT), using the reserves if necessary. Use the pool subsystem for structures small enough that this is feasible. This also obsoletes LFS_THROTTLE. And a few that are not strictly necessary: * Moves the LFS inode extensions off onto a separately allocated structure; getting closer to LFS as an LKM. "Welcome to 1.6O." * Unified GOP_ALLOC between FFS and LFS. * Update LFS copyright headers to correct values. * Actually cast to unsigned in lfs_shellsort, like the comment says. * Keep track of which segments were empty before the previous checkpoint; any segments that pass two checkpoints both dirty and empty can be summarily cleaned. Do this. Right now lfs_segclean still works, but this should be turned into an effectless compatibility syscall.
2003-02-18 02:48:08 +03:00
void (*gop_size)(struct vnode *, off_t, off_t *, int);
interfaces and structures used by new genfs_{get,put}pages().
2001-09-16 01:33:05 +04:00
int (*gop_alloc)(struct vnode *, off_t, off_t, int, struct ucred *);
int (*gop_write)(struct vnode *, struct vm_page **, int, int);
};
Add code to UBCify LFS. This is still behind "#ifdef LFS_UBC" for now (there are still some details to work out) but expect that to go away soon. To support these basic changes (creation of lfs_putpages, lfs_gop_write, mods to lfs_balloc) several other changes were made, to wit: * Create a writer daemon kernel thread whose purpose is to handle page writes for the pagedaemon, but which also takes over some of the functions of lfs_check(). This thread is started the first time an LFS is mounted. * Add a "flags" parameter to GOP_SIZE. Current values are GOP_SIZE_READ, meaning that the call should return the size of the in-core version of the file, and GOP_SIZE_WRITE, meaning that it should return the on-disk size. One of GOP_SIZE_READ or GOP_SIZE_WRITE must be specified. * Instead of using malloc(...M_WAITOK) for everything, reserve enough resources to get by and use malloc(...M_NOWAIT), using the reserves if necessary. Use the pool subsystem for structures small enough that this is feasible. This also obsoletes LFS_THROTTLE. And a few that are not strictly necessary: * Moves the LFS inode extensions off onto a separately allocated structure; getting closer to LFS as an LKM. "Welcome to 1.6O." * Unified GOP_ALLOC between FFS and LFS. * Update LFS copyright headers to correct values. * Actually cast to unsigned in lfs_shellsort, like the comment says. * Keep track of which segments were empty before the previous checkpoint; any segments that pass two checkpoints both dirty and empty can be summarily cleaned. Do this. Right now lfs_segclean still works, but this should be turned into an effectless compatibility syscall.
2003-02-18 02:48:08 +03:00
#define GOP_SIZE(vp, size, eobp, flags) \
(*VTOG(vp)->g_op->gop_size)((vp), (size), (eobp), (flags))
interfaces and structures used by new genfs_{get,put}pages().
2001-09-16 01:33:05 +04:00
#define GOP_ALLOC(vp, off, len, flags, cred) \
(*VTOG(vp)->g_op->gop_alloc)((vp), (off), (len), (flags), (cred))
#define GOP_WRITE(vp, pgs, npages, flags) \
(*VTOG(vp)->g_op->gop_write)((vp), (pgs), (npages), (flags))
Add code to UBCify LFS. This is still behind "#ifdef LFS_UBC" for now (there are still some details to work out) but expect that to go away soon. To support these basic changes (creation of lfs_putpages, lfs_gop_write, mods to lfs_balloc) several other changes were made, to wit: * Create a writer daemon kernel thread whose purpose is to handle page writes for the pagedaemon, but which also takes over some of the functions of lfs_check(). This thread is started the first time an LFS is mounted. * Add a "flags" parameter to GOP_SIZE. Current values are GOP_SIZE_READ, meaning that the call should return the size of the in-core version of the file, and GOP_SIZE_WRITE, meaning that it should return the on-disk size. One of GOP_SIZE_READ or GOP_SIZE_WRITE must be specified. * Instead of using malloc(...M_WAITOK) for everything, reserve enough resources to get by and use malloc(...M_NOWAIT), using the reserves if necessary. Use the pool subsystem for structures small enough that this is feasible. This also obsoletes LFS_THROTTLE. And a few that are not strictly necessary: * Moves the LFS inode extensions off onto a separately allocated structure; getting closer to LFS as an LKM. "Welcome to 1.6O." * Unified GOP_ALLOC between FFS and LFS. * Update LFS copyright headers to correct values. * Actually cast to unsigned in lfs_shellsort, like the comment says. * Keep track of which segments were empty before the previous checkpoint; any segments that pass two checkpoints both dirty and empty can be summarily cleaned. Do this. Right now lfs_segclean still works, but this should be turned into an effectless compatibility syscall.
2003-02-18 02:48:08 +03:00
/* Flags to GOP_SIZE */
fix a bug of lfs. genfs_getpages() can read in more blocks than it should due to faked filesize of lfs_gop_size(). it's a security problem and it makes gcc3 "internal error" to fix this, - in genfs_getpages(), always calculate diskeof and memeof separately so that filesystems (in this case, lfs) can use different strategies for them. - introduce GOP_SIZE_MEM flag and use it to request in-core filesize. (it was an intention of GOP_SIZE_READ, but after the above change _READ is not a straightforward name) after this, no one uses GOP_SIZE_{READ,WRITE} anymore but leave them for now.
2003-09-24 14:22:53 +04:00
#define GOP_SIZE_READ 0x1 /* Advise how many pages to read */
#define GOP_SIZE_WRITE 0x2 /* Tell how many pages to write */
#define GOP_SIZE_MEM 0x4 /* in-memory size */
Add code to UBCify LFS. This is still behind "#ifdef LFS_UBC" for now (there are still some details to work out) but expect that to go away soon. To support these basic changes (creation of lfs_putpages, lfs_gop_write, mods to lfs_balloc) several other changes were made, to wit: * Create a writer daemon kernel thread whose purpose is to handle page writes for the pagedaemon, but which also takes over some of the functions of lfs_check(). This thread is started the first time an LFS is mounted. * Add a "flags" parameter to GOP_SIZE. Current values are GOP_SIZE_READ, meaning that the call should return the size of the in-core version of the file, and GOP_SIZE_WRITE, meaning that it should return the on-disk size. One of GOP_SIZE_READ or GOP_SIZE_WRITE must be specified. * Instead of using malloc(...M_WAITOK) for everything, reserve enough resources to get by and use malloc(...M_NOWAIT), using the reserves if necessary. Use the pool subsystem for structures small enough that this is feasible. This also obsoletes LFS_THROTTLE. And a few that are not strictly necessary: * Moves the LFS inode extensions off onto a separately allocated structure; getting closer to LFS as an LKM. "Welcome to 1.6O." * Unified GOP_ALLOC between FFS and LFS. * Update LFS copyright headers to correct values. * Actually cast to unsigned in lfs_shellsort, like the comment says. * Keep track of which segments were empty before the previous checkpoint; any segments that pass two checkpoints both dirty and empty can be summarily cleaned. Do this. Right now lfs_segclean still works, but this should be turned into an effectless compatibility syscall.
2003-02-18 02:48:08 +03:00
interfaces and structures used by new genfs_{get,put}pages().
2001-09-16 01:33:05 +04:00
struct genfs_node {
struct genfs_ops *g_op; /* ops vector */
struct lock g_glock; /* getpages lock */
};
#define VTOG(vp) ((struct genfs_node *)(vp)->v_data)
Add code to UBCify LFS. This is still behind "#ifdef LFS_UBC" for now (there are still some details to work out) but expect that to go away soon. To support these basic changes (creation of lfs_putpages, lfs_gop_write, mods to lfs_balloc) several other changes were made, to wit: * Create a writer daemon kernel thread whose purpose is to handle page writes for the pagedaemon, but which also takes over some of the functions of lfs_check(). This thread is started the first time an LFS is mounted. * Add a "flags" parameter to GOP_SIZE. Current values are GOP_SIZE_READ, meaning that the call should return the size of the in-core version of the file, and GOP_SIZE_WRITE, meaning that it should return the on-disk size. One of GOP_SIZE_READ or GOP_SIZE_WRITE must be specified. * Instead of using malloc(...M_WAITOK) for everything, reserve enough resources to get by and use malloc(...M_NOWAIT), using the reserves if necessary. Use the pool subsystem for structures small enough that this is feasible. This also obsoletes LFS_THROTTLE. And a few that are not strictly necessary: * Moves the LFS inode extensions off onto a separately allocated structure; getting closer to LFS as an LKM. "Welcome to 1.6O." * Unified GOP_ALLOC between FFS and LFS. * Update LFS copyright headers to correct values. * Actually cast to unsigned in lfs_shellsort, like the comment says. * Keep track of which segments were empty before the previous checkpoint; any segments that pass two checkpoints both dirty and empty can be summarily cleaned. Do this. Right now lfs_segclean still works, but this should be turned into an effectless compatibility syscall.
2003-02-18 02:48:08 +03:00
void genfs_size(struct vnode *, off_t, off_t *, int);
interfaces and structures used by new genfs_{get,put}pages().
2001-09-16 01:33:05 +04:00
void genfs_node_init(struct vnode *, struct genfs_ops *);
int genfs_gop_write(struct vnode *, struct vm_page **, int, int);
add some compatibility routines to allow mmap() to work non-UBCified filesystems (in the same non-coherent fashion that they worked before).
2001-12-18 10:49:36 +03:00
int genfs_compat_gop_write(struct vnode *, struct vm_page **, int, int);
interfaces and structures used by new genfs_{get,put}pages().
2001-09-16 01:33:05 +04:00
#endif /* _MISCFS_GENFS_GENFS_NODE_H_ */