/* $NetBSD: mntfs.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */ /* * Copyright (c) 1997-2014 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. 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. * * * File: am-utils/amd/mntfs.c * */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include qelem mfhead = {&mfhead, &mfhead}; int mntfs_allocated; am_loc * dup_loc(am_loc *loc) { loc->al_refc++; if (loc->al_mnt) { dup_mntfs(loc->al_mnt); } return loc; } 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_fsflags = ops->nfs_fs_flags; mf->mf_fo = 0; if (mo) mf->mf_fo = copy_opts(mo); mf->mf_mount = xstrdup(mp); mf->mf_info = xstrdup(info); mf->mf_auto = xstrdup(auto_opts); mf->mf_mopts = xstrdup(mopts); mf->mf_remopts = xstrdup(remopts); mf->mf_loopdev = NULL; mf->mf_refc = 1; mf->mf_flags = 0; mf->mf_error = -1; mf->mf_cid = 0; mf->mf_private = NULL; mf->mf_prfree = NULL; if (ops->ffserver) mf->mf_server = (*ops->ffserver) (mf); else mf->mf_server = NULL; } 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; } /* find a matching mntfs in our list */ mntfs * locate_mntfs(am_ops *ops, am_opts *mo, char *mp, char *info, char *auto_opts, char *mopts, char *remopts) { mntfs *mf; dlog("Locating mntfs reference to (%s,%s)", mp, info); ITER(mf, mntfs, &mfhead) { /* * For backwards compatibility purposes, we treat already-mounted * filesystems differently and only require a match of their mount point, * not of their server info. After all, there is little we can do if * the user asks us to mount two different things onto the same mount: one * will always cover the other one. */ if (STREQ(mf->mf_mount, mp) && ((mf->mf_flags & MFF_MOUNTED && !(mf->mf_fsflags & FS_DIRECT)) || (STREQ(mf->mf_info, info) && mf->mf_ops == ops))) { /* * 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; return dup_mntfs(mf); } dlog("mf->mf_flags = %#x", mf->mf_flags); if ((mf->mf_flags & MFF_RESTART) && amd_state < Finishing) { /* * Restart a previously mounted filesystem. */ dlog("Restarting filesystem %s", mf->mf_mount); /* * If we are restarting an amd internal filesystem, * we need to initialize it a bit. * * We know it's internal because it is marked as toplvl. */ if (mf->mf_ops == &amfs_toplvl_ops) { mf->mf_ops = ops; mf->mf_info = strealloc(mf->mf_info, info); ops->mounted(mf); /* XXX: not right, but will do for now */ } return mf; } 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 = NULL; } 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 0; } /* find a matching mntfs in our list, create a new one if none is found */ mntfs * find_mntfs(am_ops *ops, am_opts *mo, char *mp, char *info, char *auto_opts, char *mopts, char *remopts) { mntfs *mf = locate_mntfs(ops, mo, mp, info, auto_opts, mopts, remopts); if (mf) return mf; return alloc_mntfs(ops, mo, mp, info, auto_opts, mopts, remopts); } mntfs * new_mntfs(void) { return alloc_mntfs(&amfs_error_ops, (am_opts *) NULL, "//nil//", ".", "", "", ""); } am_loc * new_loc(void) { am_loc *loc = CALLOC(struct am_loc); loc->al_fo = 0; loc->al_mnt = new_mntfs(); loc->al_refc = 1; return loc; } static void uninit_mntfs(mntfs *mf) { if (mf->mf_fo) { free_opts(mf->mf_fo); XFREE(mf->mf_fo); } XFREE(mf->mf_auto); XFREE(mf->mf_mopts); XFREE(mf->mf_remopts); XFREE(mf->mf_info); if (mf->mf_private && mf->mf_prfree) (*mf->mf_prfree) (mf->mf_private); 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); XFREE(mf); --mntfs_allocated; } static void discard_loc(voidp v) { am_loc *loc = v; if (loc->al_fo) { free_opts(loc->al_fo); XFREE(loc->al_fo); } XFREE(loc); } 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_loc(opaque_t arg) { am_loc *loc = (am_loc *) arg; dlog("free_loc %p", loc); if (loc->al_refc <= 0) { plog(XLOG_ERROR, "IGNORING free_loc for 0x%p", loc); return; } if (loc->al_mnt) free_mntfs(loc->al_mnt); if (--loc->al_refc == 0) { discard_loc(loc); } } void free_mntfs(opaque_t arg) { mntfs *mf = (mntfs *) arg; dlog("free_mntfs <%s> type %s mf_refc %d flags %x", mf->mf_mount, mf->mf_ops->fs_type, mf->mf_refc, mf->mf_flags); /* * We shouldn't ever be called to free something that has * a non-positive refcount. Something is badly wrong if * we have been! Ignore the request for now... */ if (mf->mf_refc <= 0) { plog(XLOG_ERROR, "IGNORING free_mntfs for <%s>: refc %d, flags %x (bug?)", mf->mf_mount, mf->mf_refc, mf->mf_flags); return; } /* don't discard last reference of a restarted/kept mntfs */ if (mf->mf_refc == 1 && mf->mf_flags & MFF_RSTKEEP) { plog(XLOG_ERROR, "IGNORING free_mntfs for <%s>: refc %d, flags %x (restarted)", mf->mf_mount, mf->mf_refc, mf->mf_flags); return; } 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_fsflags & FS_DISCARD) { dlog("Immediately discarding mntfs for %s", mf->mf_mount); discard_mntfs(mf); } else { 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); 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_flags & MFF_RESTART && 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)) { return mf; } mf2 = find_mntfs(ops, mo, mp, info, auto_opts, mopts, remopts); free_mntfs(mf); return mf2; }