dc_vnops.c revision de710d24d2fae4468e64da999e1d952a247f142c
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * CDDL HEADER START
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * The contents of this file are subject to the terms of the
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Common Development and Distribution License (the "License").
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * You may not use this file except in compliance with the License.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * See the License for the specific language governing permissions
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * and limitations under the License.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * When distributing Covered Code, include this CDDL HEADER in each
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * If applicable, add the following below this CDDL HEADER, with the
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986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * information: Portions Copyright [yyyy] [name of copyright owner]
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * CDDL HEADER END
0fbb751d81ab0a7c7ddfd8d4e447e075a9f7024fJohn Levon * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/* All Rights Reserved */
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * University Copyright- Copyright (c) 1982, 1986, 1988
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * The Regents of the University of California
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * All Rights Reserved
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * University Acknowledgment- Portions of this document are derived from
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * software developed by the University of California, Berkeley, and its
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * contributors.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * dcfs - A filesystem for automatic decompressing of fiocompressed files
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * This filesystem is a layered filesystem that sits on top of a normal
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * persistent filesystem and provides automatic decompression of files
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * that have been previously compressed and stored on the host file system.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * This is a pseudo filesystem in that it does not persist data, rather it
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * intercepts file lookup requests on the host filesystem and provides
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * transparent decompression of those files. Currently the only supported
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * host filesystem is ufs.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * A file is compressed via a userland utility (currently cmd/boot/fiocompress)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * and marked by fiocompress as a compressed file via a flag in the on-disk
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * inode (set via a ufs ioctl() - see `ufs_vnops.c`ufs_ioctl()`_FIO_COMPRESSED
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * ufs_lookup checks for this flag and if set, passes control to decompvp
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * a function defined in this (dcfs) filesystem. decomvp uncompresses the file
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * and returns a dcfs vnode to the VFS layer.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * dcfs is layered on top of ufs and passes requests involving persistence
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * to the underlying ufs filesystem. The compressed files currently cannot be
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * written to.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Define data structures within this file.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje#define DCHASH(vp) (((uintptr_t)(vp) >> DCSHFT) & (DCTABLESIZE - 1))
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje#define DCHASH(vp) (((uintptr_t)(vp) >> DCSHFT) % DTABLESIZEC)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dcinit(int, char *);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * This is the loadable module wrapper.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Module linkage information for the kernel.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_open(struct vnode **, int, struct cred *, caller_context_t *);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_close(struct vnode *, int, int, offset_t,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_read(struct vnode *, struct uio *, int, struct cred *,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_getattr(struct vnode *, struct vattr *, int,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_setattr(struct vnode *, struct vattr *, int, struct cred *,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_fsync(struct vnode *, int, struct cred *, caller_context_t *);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic void dc_inactive(struct vnode *, struct cred *, caller_context_t *);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_fid(struct vnode *, struct fid *, caller_context_t *);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_seek(struct vnode *, offset_t, offset_t *, caller_context_t *);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_frlock(struct vnode *, int, struct flock64 *, int, offset_t,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje struct flk_callback *, struct cred *, caller_context_t *);
e38c922ef0e324c6fd8b205270fd97d564f88630Andrew Balfourstatic int dc_realvp(struct vnode *, struct vnode **, caller_context_t *);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_getpage(struct vnode *, offset_t, size_t, uint_t *,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje struct page **, size_t, struct seg *, caddr_t, enum seg_rw,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_putpage(struct vnode *, offset_t, size_t, int,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_map(struct vnode *, offset_t, struct as *, caddr_t *, size_t,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje uchar_t, uchar_t, uint_t, struct cred *, caller_context_t *);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_addmap(struct vnode *, offset_t, struct as *, caddr_t, size_t,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje uchar_t, uchar_t, uint_t, struct cred *, caller_context_t *);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic int dc_delmap(struct vnode *, offset_t, struct as *, caddr_t, size_t,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje uint_t, uint_t, uint_t, struct cred *, caller_context_t *);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_open(struct vnode **vpp, int flag, struct cred *cr, caller_context_t *ctp)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_close(struct vnode *vp, int flag, int count, offset_t off,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_read(struct vnode *vp, struct uio *uiop, int ioflag, struct cred *cr,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje size_t rdsize = MAX(MAXBSIZE, dp->dc_hdr->ch_blksize);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Loop through file with segmap, decompression will occur
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * in dc_getapage
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * read to end of block or file
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje if (n == 0)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0); /* at EOF */
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje base = segmap_getmapflt(segkmap, vp, uiop->uio_loffset, n, 1,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje if (n + mapon == rdsize || uiop->uio_loffset == fsize)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_getattr(struct vnode *vp, struct vattr *vap, int flags,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje /* substitute uncompressed size */
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_setattr(struct vnode *vp, struct vattr *vap, int flags, cred_t *cred,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_fsync(vnode_t *vp, int syncflag, cred_t *cred, caller_context_t *ctp)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_inactive(struct vnode *vp, cred_t *cr, caller_context_t *ctp)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Somebody accessed the dcnode before we got a chance to
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * remove it. They will remove it when they do a vn_rele.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_fid(struct vnode *vp, struct fid *fidp, caller_context_t *ctp)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_seek(struct vnode *vp, offset_t oof, offset_t *noffp, caller_context_t *ctp)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_frlock(struct vnode *vp, int cmd, struct flock64 *bfp, int flag,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * If file is being mapped, disallow frlock.
53eed1cb389966d2dd60e74de0933f3b3277dbbdJohn.Zolnowsky@Sun.COM if (error = VOP_GETATTR(dp->dc_subvp, &vattr, 0, cr, ctp))
53eed1cb389966d2dd60e74de0933f3b3277dbbdJohn.Zolnowsky@Sun.COM if (dp->dc_mapcnt > 0 && MANDLOCK(vp, vattr.va_mode))
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr, ctp));
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_getblock_miss(struct vnode *vp, offset_t off, size_t len, struct page **ppp,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje struct seg *seg, caddr_t addr, enum seg_rw rw, struct cred *cr)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Get destination pages and make them addressable
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje pp = page_create_va(vp, off, len, PG_WAIT, seg, addr);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * read compressed data from subordinate vnode
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje error = vn_rdwr(UIO_READ, dp->dc_subvp, saddr, rdsize, rdoff,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Uncompress
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje zerr = z_uncompress(bp->b_un.b_addr, &dsize, saddr, dp->dc_zmax);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Handle EOF
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_getblock(struct vnode *vp, offset_t off, size_t len, struct page **ppp,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje struct seg *seg, caddr_t addr, enum seg_rw rw, struct cred *cr)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * pvn_read_kluster() doesn't quite do what we want, since it
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * thinks sub block reads are ok. Here we always decompress
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * a full block.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Check page cache
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje for (pgoff = off; pgoff < off + len; pgoff += PAGESIZE) {
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0); /* all pages in cache */
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Undo any locks so getblock_miss has an open field
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (dc_getblock_miss(vp, off, len, ppp, seg, addr, rw, cr));
e38c922ef0e324c6fd8b205270fd97d564f88630Andrew Balfourdc_realvp(vnode_t *vp, vnode_t **vpp, caller_context_t *ct)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED10*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_getpage(struct vnode *vp, offset_t off, size_t len, uint_t *protp,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje struct page *pl[], size_t plsz, struct seg *seg, caddr_t addr,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje enum seg_rw rw, struct cred *cr, caller_context_t *ctp)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje /* does not support write */
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje /*NOTREACHED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * We don't support asynchronous operation at the moment, so
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * just pretend we did it. If the pages are ever actually
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * needed, they'll get brought in then.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Calc block start and end offsets
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje vp_baddr = (caddr_t)rounddown((uintptr_t)addr, bsize);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje while (nblks--) {
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje error = dc_getblock(vp, vp_boff, bsize, &pp, seg, vp_baddr,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * This function should never be called. We need to have it to pass
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * it as an argument to other functions.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_putapage(struct vnode *vp, struct page *pp, u_offset_t *offp, size_t *lenp,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje /* should never happen */
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje /*NOTREACHED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * The only flags we support are B_INVAL, B_FREE and B_DONTNEED.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * B_INVAL is set by:
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * 1) the MC_SYNC command of memcntl(2) to support the MS_INVALIDATE flag.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * 2) the MC_ADVISE command of memcntl(2) with the MADV_DONTNEED advice
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * which translates to an MC_SYNC with the MS_INVALIDATE flag.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * The B_FREE (as well as the B_DONTNEED) flag is set when the
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * MADV_SEQUENTIAL advice has been used. VOP_PUTPAGE is invoked
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * from SEGVN to release pages behind a pagefault.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED5*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_putpage(struct vnode *vp, offset_t off, size_t len, int flags,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje /*NOTREACHED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje error = pvn_vplist_dirty(vp, off, dc_putapage, flags, cr);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje se_t se = (flags & (B_INVAL | B_FREE)) ? SE_EXCL : SE_SHARED;
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje for (io_off = off; io_off < off + len; io_off += PAGESIZE) {
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * We insist on getting the page only if we are
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * about to invalidate, free or write it and
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * the B_ASYNC flag is not set.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Normally pvn_getdirty() should return 0, which
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * impies that it has done the job for us.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * The shouldn't-happen scenario is when it returns 1.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * This means that the page has been modified and
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * needs to be put back.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Since we can't write to a dcfs compressed file,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * we fake a failed I/O and force pvn_write_done()
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * to destroy the page.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_map(struct vnode *vp, offset_t off, struct as *as, caddr_t *addrp,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje size_t len, uchar_t prot, uchar_t maxprot, uint_t flags,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje if (off < (offset_t)0 || (offset_t)(off + len) < (offset_t)0)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * If file is being locked, disallow mapping.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje if (error = VOP_GETATTR(VTODC(vp)->dc_subvp, &vattr, 0, cred, ctp))
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * User specified address - blow away any previous mappings
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_addmap(struct vnode *vp, offset_t off, struct as *as, caddr_t addr,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje size_t len, uchar_t prot, uchar_t maxprot, uint_t flags,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedc_delmap(struct vnode *vp, offset_t off, struct as *as, caddr_t addr,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje size_t len, uint_t prot, uint_t maxprot, uint_t flags,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Constructor/destructor routines for dcnodes
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED1*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedcnode_constructor(void *buf, void *cdrarg, int kmflags)
8bd3a292467a7ce00ecf774f887442a82e26e438tomee return (-1);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje/*ARGSUSED*/
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic struct dcnode *
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * If the free list is above DCLRUSIZE
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * re-use one from it
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * If no cached pages, no need to put it on lru
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Add to lru, if it's over the limit, free from head
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje (void) pvn_vplist_dirty(vp, 0, dc_putapage, B_INVAL, NULL);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje static const fs_operation_def_t dc_vfsops_template[] = {
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje error = vfs_setfsops(fstype, dc_vfsops_template, &dc_vfsops);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje error = vn_make_ops(name, dc_vnodeops_template, &dc_vnodeops);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje if (error != 0) {
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje dcnode_cache = kmem_cache_create("dcnode_cache", sizeof (struct dcnode),
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje 0, dcnode_constructor, dcnode_destructor, NULL, NULL, NULL, 0);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Return shadow vnode with the given vp as its subordinate
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjedecompvp(struct vnode *vp, cred_t *cred, caller_context_t *ctp)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * See if we have an existing shadow
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * If none, we have to manufacture one
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Make sure it's a valid compressed file
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje error = vn_rdwr(UIO_READ, vp, (caddr_t)hdr, sizeof (struct comphdr), 0,
1d7f3fadeebf3754e3f042d91e7a4439755dc598Krishnendu Sadhukhan - Sun Microsystems if (error || hdr->ch_magic != CH_MAGIC_ZLIB ||
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje hdr->ch_version != CH_VERSION || hdr->ch_algorithm != CH_ALG_ZLIB ||
de710d24d2fae4468e64da999e1d952a247f142cJosef 'Jeff' Sipek hdr->ch_blksize > ptob(DCCACHESIZE) || !ISP2(hdr->ch_blksize))
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje /* get underlying file size */
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Re-read entire header
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje error = vn_rdwr(UIO_READ, vp, (caddr_t)hdr, hdrsize, 0, UIO_SYSSPACE,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * add extra blkmap entry to make dc_getblock()'s
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * life easier
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje hdr->ch_blkmap[((hdr->ch_fsize-1) / bsize) + 1] = vattr.va_size;
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Allocate kmem cache if none there already
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje *cpp = kmem_cache_create("dcbuf_cache", ndp->dc_zmax, 0, NULL,
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Recheck table in case someone else created shadow
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * while we were blocked above.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * dcnode lookup table
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * These routines maintain a table of dcnodes hashed by their
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * subordinate vnode so that they can be found if they already
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * exist in the vnode cache
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Put a dcnode in the table.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Remove a dcnode from the hash table.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Find a shadow vnode in the dctable hash list.
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setjestatic struct dcnode *
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje for (dp = dctable[DCHASH(vp)]; dp != NULL; dp = dp->dc_hash)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (0);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje for (dp = dclru; dp->dc_lrunext != dclru; dp = dp->dc_lrunext)
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje return (i + 1);
986fd29a0dc13f7608ef7f508f6e700bd7bc2720setje * Add to dclru as double-link chain