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Usenet 1994 October
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usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso
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unix
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volume21
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amd
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part05
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mntfs.c
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C/C++ Source or Header
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1990-04-10
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7KB
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307 lines
/*
* $Id: mntfs.c,v 5.1.1.3 90/01/11 17:10:07 jsp Exp Locker: jsp $
*
* 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 are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by Imperial College of Science, Technology and Medicine, London, UK.
* The names of the College and University may not be used to endorse
* or promote products derived from this software without specific
* prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* %W% (Berkeley) %G%
*/
#include "am.h"
extern qelem mfhead;
qelem mfhead = { &mfhead, &mfhead };
int mntfs_allocated;
/*
* This is the default attributes field which
* is copied into every new node to be created.
* The individual filesystem fs_init() routines
* patch the copy to represent the particular
* details for the relevant filesystem type
*/
static struct fattr gen_fattr = {
NFDIR, /* type */
NFSMODE_DIR | 0555, /* mode */
2, /* nlink */
0, /* uid */
0, /* gid */
512, /* size */
4096, /* blocksize */
0, /* rdev */
1, /* blocks */
0, /* fsid */
0, /* fileid */
{ 0, 0 }, /* atime */
{ 0, 0 }, /* mtime */
{ 0, 0 }, /* ctime */
};
mntfs *dup_mntfs(mf)
mntfs *mf;
{
if (mf->mf_refc == 0) {
untimeout(mf->mf_cid);
mf->mf_cid = 0;
mf->mf_error = -1;
mf->mf_error &= ~MFF_ERROR;
}
mf->mf_refc++;
return mf;
}
static init_mntfs(mf, ops, mo, mp, info, opts)
mntfs *mf;
am_ops *ops;
am_opts *mo;
char *mp;
char *info;
char *opts;
{
mf->mf_ops = ops;
mf->mf_fo = mo;
mf->mf_mount = strdup(mp);
mf->mf_info = strdup(info);
mf->mf_opts = strdup(opts);
mf->mf_refc = 1;
mf->mf_flags = 0;
mf->mf_error = -1;
mf->mf_cid = 0;
mf->mf_private = 0;
mf->mf_prfree = 0;
mf->mf_attr.status = NFS_OK;
mf->mf_fattr = gen_fattr;
mf->mf_fattr.fsid = 42;
mf->mf_fattr.fileid = 0;
mf->mf_fattr.atime.seconds = clocktime();
mf->mf_fattr.atime.useconds = 0;
mf->mf_fattr.mtime = mf->mf_fattr.ctime = mf->mf_fattr.atime;
if (ops->ffserver)
mf->mf_server = (*ops->ffserver)(mf);
else
mf->mf_server = 0;
}
static mntfs *alloc_mntfs(ops, mo, mp, info, opts)
am_ops *ops;
am_opts *mo;
char *mp;
char *info;
char *opts;
{
mntfs *mf = ALLOC(mntfs);
init_mntfs(mf, ops, mo, mp, info, opts);
ins_que(&mf->mf_q, &mfhead);
mntfs_allocated++;
return mf;
}
mntfs *find_mntfs(ops, mo, mp, info, opts)
am_ops *ops;
am_opts *mo;
char *mp;
char *info;
char *opts;
{
mntfs *mf;
#ifdef DEBUG
dlog("Locating mntfs reference to %s", mp);
#endif
ITER(mf, mntfs, &mfhead) {
if (STREQ(mf->mf_mount, mp)) {
/*
* Handle cases where error ops are involved
*/
if (ops == &efs_ops) {
/*
* If the existing ops are not efs_ops
* then continue...
*/
if (mf->mf_ops != &efs_ops)
continue;
} else /* ops != &efs_ops */ {
/*
* If the existing ops are efs_ops
* then continue...
*/
if (mf->mf_ops == &efs_ops)
continue;
}
if ((mf->mf_flags & MFF_RESTART) && amd_state == Run) {
/*
* Restart a previously mounted filesystem.
*/
mntfs *mf2 = alloc_mntfs(&ifs_ops, mo, mp, info, opts);
#ifdef DEBUG
dlog("Restarting filesystem %s", mf->mf_mount);
#endif
/*
* 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_opts = strealloc(mf->mf_opts, opts);
mf->mf_info = strealloc(mf->mf_info, info);
fs = ops->ffserver ? (*ops->ffserver)(mf) : (fserver *) 0;
if (mf->mf_server)
free_srvr(mf->mf_server);
mf->mf_server = fs;
}
return dup_mntfs(mf);
}
}
return alloc_mntfs(ops, mo, mp, info, opts);
}
mntfs *new_mntfs()
{
return alloc_mntfs(&efs_ops, (am_opts *) 0, "//nil//", ".", "");
}
static void uninit_mntfs(mf, rmd)
mntfs *mf;
int rmd;
{
if (mf->mf_mount) free((voidp) mf->mf_mount);
if (mf->mf_opts) free((voidp) mf->mf_opts);
if (mf->mf_info) free((voidp) 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);
/*
* 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(mf)
mntfs *mf;
{
rem_que(&mf->mf_q);
/*
* Free memory
*/
uninit_mntfs(mf, TRUE);
free((voidp) mf);
--mntfs_allocated;
}
void flush_mntfs()
{
mntfs *mf;
mf = 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(mf)
mntfs *mf;
{
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
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
mf->mf_cid = timeout(ALLOWED_MOUNT_TIME, discard_mntfs, (voidp) mf);
}
}
}
mntfs *realloc_mntfs(mf, ops, mo, mp, info, opts)
mntfs *mf;
am_ops *ops;
am_opts *mo;
char *mp;
char *info;
char *opts;
{
mntfs *mf2;
if (mf->mf_refc == 1 && mf->mf_ops == &ifs_ops && STREQ(mf->mf_mount, mp)) {
/*
* If we are inheriting then just return
* the same node...
*/
return mf;
}
mf2 = find_mntfs(ops, mo, mp, info, opts);
free_mntfs(mf);
return mf2;
}