b397c875ae
(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.
68 lines
2.9 KiB
C
68 lines
2.9 KiB
C
/* $NetBSD: genfs_node.h,v 1.4 2003/02/17 23:48:10 perseant Exp $ */
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/*
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* Copyright (c) 2001 Chuck Silvers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Chuck Silvers.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _MISCFS_GENFS_GENFS_NODE_H_
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#define _MISCFS_GENFS_GENFS_NODE_H_
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struct vm_page;
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struct genfs_ops {
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void (*gop_size)(struct vnode *, off_t, off_t *, int);
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int (*gop_alloc)(struct vnode *, off_t, off_t, int, struct ucred *);
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int (*gop_write)(struct vnode *, struct vm_page **, int, int);
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};
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#define GOP_SIZE(vp, size, eobp, flags) \
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(*VTOG(vp)->g_op->gop_size)((vp), (size), (eobp), (flags))
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#define GOP_ALLOC(vp, off, len, flags, cred) \
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(*VTOG(vp)->g_op->gop_alloc)((vp), (off), (len), (flags), (cred))
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#define GOP_WRITE(vp, pgs, npages, flags) \
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(*VTOG(vp)->g_op->gop_write)((vp), (pgs), (npages), (flags))
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/* Flags to GOP_SIZE */
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#define GOP_SIZE_READ 0x1 /* Advise how many pages to read/create */
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#define GOP_SIZE_WRITE 0x2 /* Tell how many pages to write */
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struct genfs_node {
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struct genfs_ops *g_op; /* ops vector */
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struct lock g_glock; /* getpages lock */
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};
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#define VTOG(vp) ((struct genfs_node *)(vp)->v_data)
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void genfs_size(struct vnode *, off_t, off_t *, int);
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void genfs_node_init(struct vnode *, struct genfs_ops *);
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int genfs_gop_write(struct vnode *, struct vm_page **, int, int);
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int genfs_compat_gop_write(struct vnode *, struct vm_page **, int, int);
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#endif /* _MISCFS_GENFS_GENFS_NODE_H_ */
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