/* $NetBSD: mntfs.c,v 1.1.1.4 2001/05/13 17:50:13 veego Exp $ */ /* * Copyright (c) 1997-2001 Erez Zadok * Copyright (c) 1990 Jan-Simon Pendry * Copyright (c) 1990 Imperial College of Science, Technology & Medicine * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry at Imperial College, London. * * 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 acknowledgment: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. * * %W% (Berkeley) %G% * * Id: mntfs.c,v 1.5.2.1 2001/01/10 03:23:07 ezk Exp * */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include qelem mfhead = {&mfhead, &mfhead}; int mntfs_allocated; mntfs * dup_mntfs(mntfs *mf) { if (mf->mf_refc == 0) { if (mf->mf_cid) untimeout(mf->mf_cid); mf->mf_cid = 0; } mf->mf_refc++; return mf; } static void init_mntfs(mntfs *mf, am_ops *ops, am_opts *mo, char *mp, char *info, char *auto_opts, char *mopts, char *remopts) { mf->mf_ops = ops; mf->mf_fo = mo; mf->mf_mount = strdup(mp); mf->mf_info = strdup(info); mf->mf_auto = strdup(auto_opts); mf->mf_mopts = strdup(mopts); mf->mf_remopts = strdup(remopts); mf->mf_refc = 1; mf->mf_flags = 0; mf->mf_error = -1; mf->mf_cid = 0; mf->mf_private = 0; mf->mf_prfree = 0; if (ops->ffserver) mf->mf_server = (*ops->ffserver) (mf); else mf->mf_server = 0; } static mntfs * alloc_mntfs(am_ops *ops, am_opts *mo, char *mp, char *info, char *auto_opts, char *mopts, char *remopts) { mntfs *mf = ALLOC(struct mntfs); init_mntfs(mf, ops, mo, mp, info, auto_opts, mopts, remopts); ins_que(&mf->mf_q, &mfhead); mntfs_allocated++; return mf; } mntfs * find_mntfs(am_ops *ops, am_opts *mo, char *mp, char *info, char *auto_opts, char *mopts, char *remopts) { mntfs *mf; #ifdef DEBUG dlog("Locating mntfs reference to %s", mp); #endif /* DEBUG */ ITER(mf, mntfs, &mfhead) { if (STREQ(mf->mf_mount, mp)) { /* * Handle cases where error ops are involved */ if (ops == &amfs_error_ops) { /* * If the existing ops are not amfs_error_ops * then continue... */ if (mf->mf_ops != &amfs_error_ops) continue; else return dup_mntfs(mf); } else { /* ops != &amfs_error_ops */ /* * If the existing ops are amfs_error_ops * then continue... */ if (mf->mf_ops == &amfs_error_ops) continue; } if ((mf->mf_flags & MFF_RESTART) && amd_state == Run) { /* * Restart a previously mounted filesystem. */ mntfs *mf2 = alloc_mntfs(&amfs_inherit_ops, mo, mp, info, auto_opts, mopts, remopts); #ifdef DEBUG dlog("Restarting filesystem %s", mf->mf_mount); #endif /* DEBUG */ /* * Remember who we are restarting */ mf2->mf_private = (voidp) dup_mntfs(mf); mf2->mf_prfree = free_mntfs; return mf2; } mf->mf_fo = mo; if (!(mf->mf_flags & (MFF_MOUNTED | MFF_MOUNTING | MFF_UNMOUNTING))) { fserver *fs; mf->mf_flags &= ~MFF_ERROR; mf->mf_error = -1; mf->mf_auto = strealloc(mf->mf_auto, auto_opts); mf->mf_mopts = strealloc(mf->mf_mopts, mopts); mf->mf_remopts = strealloc(mf->mf_remopts, remopts); mf->mf_info = strealloc(mf->mf_info, info); if (mf->mf_private && mf->mf_prfree) { (*mf->mf_prfree) (mf->mf_private); mf->mf_private = 0; } fs = ops->ffserver ? (*ops->ffserver) (mf) : (fserver *) NULL; if (mf->mf_server) free_srvr(mf->mf_server); mf->mf_server = fs; } return dup_mntfs(mf); } /* end of "if (STREQ(mf-> ..." */ } /* end of ITER */ return alloc_mntfs(ops, mo, mp, info, auto_opts, mopts, remopts); } mntfs * new_mntfs(void) { return alloc_mntfs(&amfs_error_ops, (am_opts *) 0, "//nil//", ".", "", "", ""); } static void uninit_mntfs(mntfs *mf, int rmd) { if (mf->mf_auto) XFREE(mf->mf_auto); if (mf->mf_mopts) XFREE(mf->mf_mopts); if (mf->mf_remopts) XFREE(mf->mf_remopts); if (mf->mf_info) XFREE(mf->mf_info); if (mf->mf_private && mf->mf_prfree) (*mf->mf_prfree) (mf->mf_private); /* * Clean up any directories that were made */ if (rmd && (mf->mf_flags & MFF_MKMNT)) rmdirs(mf->mf_mount); /* free mf_mount _AFTER_ removing the directories */ if (mf->mf_mount) XFREE(mf->mf_mount); /* * Clean up the file server */ if (mf->mf_server) free_srvr(mf->mf_server); /* * Don't do a callback on this mount */ if (mf->mf_cid) { untimeout(mf->mf_cid); mf->mf_cid = 0; } } static void discard_mntfs(voidp v) { mntfs *mf = v; rem_que(&mf->mf_q); /* * Free memory */ uninit_mntfs(mf, TRUE); XFREE(mf); --mntfs_allocated; } void flush_mntfs(void) { mntfs *mf; mf = AM_FIRST(mntfs, &mfhead); while (mf != HEAD(mntfs, &mfhead)) { mntfs *mf2 = mf; mf = NEXT(mntfs, mf); if (mf2->mf_refc == 0 && mf2->mf_cid) discard_mntfs(mf2); } } void free_mntfs(voidp v) { mntfs *mf = v; if (--mf->mf_refc == 0) { if (mf->mf_flags & MFF_MOUNTED) { int quoted; mf->mf_flags &= ~MFF_MOUNTED; /* * Record for posterity */ quoted = strchr(mf->mf_info, ' ') != 0; /* cheap */ plog(XLOG_INFO, "%s%s%s %sed fstype %s from %s", quoted ? "\"" : "", mf->mf_info, quoted ? "\"" : "", mf->mf_error ? "discard" : "unmount", mf->mf_ops->fs_type, mf->mf_mount); } if (mf->mf_ops->fs_flags & FS_DISCARD) { #ifdef DEBUG dlog("Immediately discarding mntfs for %s", mf->mf_mount); #endif /* DEBUG */ discard_mntfs(mf); } else { #ifdef DEBUG if (mf->mf_flags & MFF_RESTART) { dlog("Discarding remount hook for %s", mf->mf_mount); } else { dlog("Discarding last mntfs reference to %s fstype %s", mf->mf_mount, mf->mf_ops->fs_type); } if (mf->mf_flags & (MFF_MOUNTED | MFF_MOUNTING | MFF_UNMOUNTING)) dlog("mntfs reference for %s still active", mf->mf_mount); #endif /* DEBUG */ mf->mf_cid = timeout(ALLOWED_MOUNT_TIME, discard_mntfs, (voidp) mf); } } } mntfs * realloc_mntfs(mntfs *mf, am_ops *ops, am_opts *mo, char *mp, char *info, char *auto_opts, char *mopts, char *remopts) { mntfs *mf2; if (mf->mf_refc == 1 && mf->mf_ops == &amfs_inherit_ops && STREQ(mf->mf_mount, mp)) { /* * If we are inheriting then just return * the same node... */ return mf; } /* * Re-use the existing mntfs if it is mounted. * This traps a race in nfsx. */ if (mf->mf_ops != &amfs_error_ops && (mf->mf_flags & MFF_MOUNTED) && !FSRV_ISDOWN(mf->mf_server)) { mf->mf_fo = mo; return mf; } mf2 = find_mntfs(ops, mo, mp, info, auto_opts, mopts, remopts); free_mntfs(mf); #if 0 /* * XXX: EZK IS THIS RIGHT??? * The next "if" statement is what supposedly fixes bgmount() in * that it will actually use the ops structure of the next mount * entry, if the previous one failed. */ if (mf2 && ops && mf2->mf_ops != ops && mf2->mf_ops != &amfs_inherit_ops && mf2->mf_ops != &amfs_toplvl_ops && mf2->mf_ops != &amfs_error_ops) { plog(XLOG_WARNING, "realloc_mntfs: copy fallback ops \"%s\" over \"%s\"", ops->fs_type, mf2->mf_ops->fs_type); mf2->mf_ops = ops; } #endif return mf2; }