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NetBSD/dist/am-utils/amd/amfs_generic.c

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/* $NetBSD: amfs_generic.c,v 1.6 2007/04/04 21:40:48 christos Exp $ */
/*
* Copyright (c) 1997-2005 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.
*
*
* File: am-utils/amd/amfs_generic.c
*
*/
/*
* generic functions used by amfs filesystems, ripped out of amfs_auto.c.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>
/****************************************************************************
*** MACROS ***
****************************************************************************/
#define IN_PROGRESS(cp) ((cp)->mp->am_mnt->mf_flags & MFF_MOUNTING)
/****************************************************************************
*** STRUCTURES ***
****************************************************************************/
/*
* Mounting a file system may take a significant period of time. The
* problem is that if this is done in the main process thread then the
* entire automounter could be blocked, possibly hanging lots of processes
* on the system. Instead we use a continuation scheme to allow mounts to
* be attempted in a sub-process. When the sub-process exits we pick up the
* exit status (by convention a UN*X error number) and continue in a
* notifier. The notifier gets handed a data structure and can then
* determine whether the mount was successful or not. If not, it updates
* the data structure and tries again until there are no more ways to try
* the mount, or some other permanent error occurs. In the mean time no RPC
* reply is sent, even after the mount is successful. We rely on the RPC
* retry mechanism to resend the lookup request which can then be handled.
*/
struct continuation {
am_node *mp; /* Node we are trying to mount */
int retry; /* Try again? */
time_t start; /* Time we started this mount */
int callout; /* Callout identifier */
mntfs **mf; /* Current mntfs */
};
/****************************************************************************
*** FORWARD DEFINITIONS ***
****************************************************************************/
static am_node *amfs_lookup_node(am_node *mp, char *fname, int *error_return);
static mntfs *amfs_lookup_one_mntfs(am_node *new_mp, mntfs *mf, char *ivec,
char *def_opts, char *pfname);
static mntfs **amfs_lookup_mntfs(am_node *new_mp, int *error_return);
static void amfs_cont(int rc, int term, opaque_t arg);
static void amfs_retry(int rc, int term, opaque_t arg);
static void free_continuation(struct continuation *cp);
static int amfs_bgmount(struct continuation *cp);
static char *amfs_parse_defaults(am_node *mp, mntfs *mf, char *def_opts);
/****************************************************************************
*** FUNCTIONS ***
****************************************************************************/
static am_node *
amfs_lookup_node(am_node *mp, char *fname, int *error_return)
{
am_node *new_mp;
int error = 0; /* Error so far */
int in_progress = 0; /* # of (un)mount in progress */
mntfs *mf;
char *expanded_fname = 0;
dlog("in amfs_lookup_node");
/*
* If the server is shutting down
* then don't return information
* about the mount point.
*/
if (amd_state == Finishing) {
if (mp->am_mnt == 0 || mp->am_mnt->mf_fsflags & FS_DIRECT) {
dlog("%s mount ignored - going down", fname);
} else {
dlog("%s/%s mount ignored - going down", mp->am_path, fname);
}
ereturn(ENOENT);
}
/*
* Handle special case of "." and ".."
*/
if (fname[0] == '.') {
if (fname[1] == '\0')
return mp; /* "." is the current node */
if (fname[1] == '.' && fname[2] == '\0') {
if (mp->am_parent) {
dlog(".. in %s gives %s", mp->am_path, mp->am_parent->am_path);
return mp->am_parent; /* ".." is the parent node */
}
ereturn(ESTALE);
}
}
/*
* Check for valid key name.
* If it is invalid then pretend it doesn't exist.
*/
if (!valid_key(fname)) {
plog(XLOG_WARNING, "Key \"%s\" contains a disallowed character", fname);
ereturn(ENOENT);
}
/*
* Expand key name.
* expanded_fname is now a private copy.
*/
expanded_fname = expand_selectors(fname);
/*
* Search children of this node
*/
for (new_mp = mp->am_child; new_mp; new_mp = new_mp->am_osib) {
if (FSTREQ(new_mp->am_name, expanded_fname)) {
if (new_mp->am_error) {
error = new_mp->am_error;
continue;
}
/*
* If the error code is undefined then it must be
* in progress.
*/
mf = new_mp->am_mnt;
if (mf->mf_error < 0)
goto in_progrss;
/*
* If there was a previous error with this node
* then return that error code.
*/
if (mf->mf_flags & MFF_ERROR) {
error = mf->mf_error;
continue;
}
if (!(mf->mf_flags & MFF_MOUNTED) || (mf->mf_flags & MFF_UNMOUNTING)) {
in_progrss:
/*
* If the fs is not mounted or it is unmounting then there
* is a background (un)mount in progress. In this case
* we just drop the RPC request (return nil) and
* wait for a retry, by which time the (un)mount may
* have completed.
*/
dlog("ignoring mount of %s in %s -- %smounting in progress, flags %x",
expanded_fname, mf->mf_mount,
(mf->mf_flags & MFF_UNMOUNTING) ? "un" : "", mf->mf_flags);
in_progress++;
if (mf->mf_flags & MFF_UNMOUNTING) {
dlog("will remount later");
new_mp->am_flags |= AMF_REMOUNT;
}
continue;
}
/*
* Otherwise we have a hit: return the current mount point.
*/
dlog("matched %s in %s", expanded_fname, new_mp->am_path);
XFREE(expanded_fname);
return new_mp;
}
}
if (in_progress) {
dlog("Waiting while %d mount(s) in progress", in_progress);
XFREE(expanded_fname);
ereturn(-1);
}
/*
* If an error occurred then return it.
*/
if (error) {
dlog("Returning error: %s", strerror(error));
XFREE(expanded_fname);
ereturn(error);
}
/*
* If the server is going down then just return,
* don't try to mount any more file systems
*/
if ((int) amd_state >= (int) Finishing) {
dlog("not found - server going down anyway");
ereturn(ENOENT);
}
/*
* Allocate a new map
*/
new_mp = get_ap_child(mp, expanded_fname);
XFREE(expanded_fname);
if (new_mp == 0)
ereturn(ENOSPC);
*error_return = -1;
return new_mp;
}
static mntfs *
amfs_lookup_one_mntfs(am_node *new_mp, mntfs *mf, char *ivec,
char *def_opts, char *pfname)
{
am_ops *p;
am_opts *fs_opts;
mntfs *new_mf;
char *mp_dir = 0;
#ifdef HAVE_FS_AUTOFS
int on_autofs = 1;
#endif /* HAVE_FS_AUTOFS */
/* match the operators */
fs_opts = CALLOC(am_opts);
p = ops_match(fs_opts, ivec, def_opts, new_mp->am_path,
pfname, mf->mf_info);
#ifdef HAVE_FS_AUTOFS
/* XXX: this should be factored out into an autofs-specific function */
if (new_mp->am_flags & AMF_AUTOFS) {
/* ignore user-provided fs if we're using autofs */
if (fs_opts->opt_sublink) {
/*
* For sublinks we need to use a hack with autofs:
* mount the filesystem on the original opt_fs (which is NOT an
* autofs mountpoint) and symlink (or lofs-mount) to it from
* the autofs mountpoint.
*/
on_autofs = 0;
mp_dir = fs_opts->opt_fs;
} else {
if (p->autofs_fs_flags & FS_ON_AUTOFS) {
mp_dir = new_mp->am_path;
} else {
mp_dir = fs_opts->opt_fs;
on_autofs = 0;
}
}
} else
#endif /* HAVE_FS_AUTOFS */
mp_dir = fs_opts->opt_fs;
/*
* Find or allocate a filesystem for this node.
*/
new_mf = find_mntfs(p, fs_opts,
mp_dir,
fs_opts->fs_mtab,
def_opts,
fs_opts->opt_opts,
fs_opts->opt_remopts);
/*
* See whether this is a real filesystem
*/
p = new_mf->mf_ops;
if (p == &amfs_error_ops) {
plog(XLOG_MAP, "Map entry %s for %s did not match", ivec, new_mp->am_path);
free_mntfs(new_mf);
return NULL;
}
dlog("Got a hit with %s", p->fs_type);
#ifdef HAVE_FS_AUTOFS
if (new_mp->am_flags & AMF_AUTOFS && on_autofs) {
new_mf->mf_flags |= MFF_ON_AUTOFS;
new_mf->mf_fsflags = new_mf->mf_ops->autofs_fs_flags;
}
/*
* A new filesystem is an autofs filesystems if:
* 1. it claims it can be one (has the FS_AUTOFS flag)
* 2. autofs is enabled system-wide
* 3. either has an autofs parent,
* or it is explicitly requested to be autofs.
*/
if (new_mf->mf_ops->autofs_fs_flags & FS_AUTOFS &&
amd_use_autofs &&
((mf->mf_flags & MFF_IS_AUTOFS) ||
(new_mf->mf_fo && new_mf->mf_fo->opt_mount_type &&
STREQ(new_mf->mf_fo->opt_mount_type, "autofs"))))
new_mf->mf_flags |= MFF_IS_AUTOFS;
#endif /* HAVE_FS_AUTOFS */
return new_mf;
}
static mntfs **
amfs_lookup_mntfs(am_node *new_mp, int *error_return)
{
am_node *mp;
char *info; /* Mount info - where to get the file system */
char **ivecs, **cur_ivec; /* Split version of info */
int num_ivecs;
char *orig_def_opts; /* Original Automount options */
char *def_opts; /* Automount options */
int error = 0; /* Error so far */
char path_name[MAXPATHLEN]; /* General path name buffer */
char *pfname; /* Path for database lookup */
mntfs *mf, **mf_array;
int count;
dlog("in amfs_lookup_mntfs");
mp = new_mp->am_parent;
/*
* If we get here then this is a reference to an,
* as yet, unknown name so we need to search the mount
* map for it.
*/
if (mp->am_pref) {
if (strlen(mp->am_pref) + strlen(new_mp->am_name) >= sizeof(path_name))
ereturn(ENAMETOOLONG);
xsnprintf(path_name, sizeof(path_name), "%s%s", mp->am_pref, new_mp->am_name);
pfname = path_name;
} else {
pfname = new_mp->am_name;
}
mf = mp->am_mnt;
dlog("will search map info in %s to find %s", mf->mf_info, pfname);
/*
* Consult the oracle for some mount information.
* info is malloc'ed and belongs to this routine.
* It ends up being free'd in free_continuation().
*
* Note that this may return -1 indicating that information
* is not yet available.
*/
error = mapc_search((mnt_map *) mf->mf_private, pfname, &info);
if (error) {
if (error > 0)
plog(XLOG_MAP, "No map entry for %s", pfname);
else
plog(XLOG_MAP, "Waiting on map entry for %s", pfname);
ereturn(error);
}
dlog("mount info is %s", info);
/*
* Split info into an argument vector.
* The vector is malloc'ed and belongs to
* this routine. It is free'd further down.
*
* Note: the vector pointers point into info, so don't free it!
*/
ivecs = strsplit(info, ' ', '\"');
if (mf->mf_auto)
def_opts = mf->mf_auto;
else
def_opts = "";
orig_def_opts = amfs_parse_defaults(mp, mf, strdup(def_opts));
def_opts = strdup(orig_def_opts);
/* first build our defaults */
num_ivecs = 0;
for (cur_ivec = ivecs; *cur_ivec; cur_ivec++) {
if (**cur_ivec == '-') {
/*
* Pick up new defaults
*/
char *new_def_opts = str3cat(NULL, def_opts, ";", *cur_ivec + 1);
XFREE(def_opts);
def_opts = new_def_opts;
dlog("Setting def_opts to \"%s\"", def_opts);
continue;
} else
num_ivecs++;
}
mf_array = calloc(num_ivecs + 1, sizeof(mntfs *));
/* construct the array of struct mntfs for this mount point */
for (count = 0, cur_ivec = ivecs; *cur_ivec; cur_ivec++) {
mntfs *new_mf;
if (**cur_ivec == '-') {
XFREE(def_opts);
if ((*cur_ivec)[1] == '\0') {
/*
* If we have a single dash '-' than we need to reset the
* default options.
*/
def_opts = strdup(orig_def_opts);
dlog("Resetting the default options, a single dash '-' was found.");
} else {
/* append options to /default options */
def_opts = str3cat((char *) 0, orig_def_opts, ";", *cur_ivec + 1);
dlog("Resetting def_opts to \"%s\"", def_opts);
}
continue;
}
/*
* If a mntfs has already been found, and we find
* a cut then don't try any more locations.
*
* XXX: we do not know when the "/" was added as an equivalent for "||".
* It's undocumented, it might go away at any time. Caveat emptor.
*/
if (STREQ(*cur_ivec, "/") || STREQ(*cur_ivec, "||")) {
if (count > 0) {
dlog("Cut: not trying any more locations for %s", mp->am_path);
break;
}
continue;
}
new_mf = amfs_lookup_one_mntfs(new_mp, mf, *cur_ivec, def_opts, pfname);
if (new_mf == NULL)
continue;
mf_array[count++] = new_mf;
}
/* We're done with ivecs */
XFREE(ivecs);
XFREE(info);
XFREE(orig_def_opts);
XFREE(def_opts);
if (count == 0) { /* no match */
XFREE(mf_array);
ereturn(ENOENT);
}
return mf_array;
}
/*
* The continuation function. This is called by
* the task notifier when a background mount attempt
* completes.
*/
static void
amfs_cont(int rc, int term, opaque_t arg)
{
struct continuation *cp = (struct continuation *) arg;
am_node *mp = cp->mp;
mntfs *mf = mp->am_mnt;
dlog("amfs_cont: '%s'", mp->am_path);
/*
* Definitely not trying to mount at the moment
*/
mf->mf_flags &= ~MFF_MOUNTING;
/*
* While we are mounting - try to avoid race conditions
*/
new_ttl(mp);
/*
* Wakeup anything waiting for this mount
*/
wakeup(get_mntfs_wchan(mf));
/*
* Check for termination signal or exit status...
*/
if (rc || term) {
#ifdef HAVE_FS_AUTOFS
if (mf->mf_flags & MFF_IS_AUTOFS &&
!(mf->mf_flags & MFF_MOUNTED))
autofs_release_fh(mp);
#endif /* HAVE_FS_AUTOFS */
if (term) {
/*
* Not sure what to do for an error code.
*/
mf->mf_error = EIO; /* XXX ? */
mf->mf_flags |= MFF_ERROR;
plog(XLOG_ERROR, "mount for %s got signal %d", mp->am_path, term);
} else {
/*
* Check for exit status...
*/
#ifdef __linux__
/*
* HACK ALERT!
*
* On Linux (and maybe not only) it's possible to run
* an amd which "knows" how to mount certain combinations
* of nfs_proto/nfs_version which the kernel doesn't grok.
* So if we got an EINVAL and we have a server that's not
* using NFSv2/UDP, try again with NFSv2/UDP.
*
* Too bad that there is no way to dynamically determine
* what combinations the _client_ supports, as opposed to
* what the _server_ supports...
*/
if (rc == EINVAL &&
mf->mf_server &&
(mf->mf_server->fs_version != 2 ||
!STREQ(mf->mf_server->fs_proto, "udp")))
mf->mf_flags |= MFF_NFS_SCALEDOWN;
else
#endif /* __linux__ */
{
mf->mf_error = rc;
mf->mf_flags |= MFF_ERROR;
errno = rc; /* XXX */
if (!STREQ(mp->am_mnt->mf_ops->fs_type, "linkx"))
plog(XLOG_ERROR, "%s: mount (amfs_cont): %m", mp->am_path);
}
}
if (!(mf->mf_flags & MFF_NFS_SCALEDOWN)) {
/*
* If we get here then that attempt didn't work, so
* move the info vector pointer along by one and
* call the background mount routine again
*/
amd_stats.d_merr++;
cp->mf++;
}
amfs_bgmount(cp);
if (mp->am_error > 0)
assign_error_mntfs(mp);
} else {
/*
* The mount worked.
*/
dlog("Mounting %s returned success", cp->mp->am_path);
am_mounted(cp->mp);
free_continuation(cp);
}
reschedule_timeout_mp();
}
/*
* Retry a mount
*/
static void
amfs_retry(int rc, int term, opaque_t arg)
{
struct continuation *cp = (struct continuation *) arg;
am_node *mp = cp->mp;
int error = 0;
dlog("Commencing retry for mount of %s", mp->am_path);
new_ttl(mp);
if ((cp->start + ALLOWED_MOUNT_TIME) < clocktime(NULL)) {
/*
* The entire mount has timed out. Set the error code and skip past all
* the mntfs's so that amfs_bgmount will not have any more
* ways to try the mount, thus causing an error.
*/
plog(XLOG_INFO, "mount of \"%s\" has timed out", mp->am_path);
error = ETIMEDOUT;
while (*cp->mf)
cp->mf++;
/* explicitly forbid further retries after timeout */
cp->retry = FALSE;
}
if (error || !IN_PROGRESS(cp))
error = amfs_bgmount(cp);
reschedule_timeout_mp();
}
/*
* Discard an old continuation
*/
static void
free_continuation(struct continuation *cp)
{
mntfs **mfp;
dlog("free_continuation");
if (cp->callout)
untimeout(cp->callout);
/*
* we must free the mntfs's in the list.
* so free all of them if there was an error,
* or free all but the used one, if the mount succeeded.
*/
for (mfp = cp->mp->am_mfarray; *mfp; mfp++) {
free_mntfs(*mfp);
}
XFREE(cp->mp->am_mfarray);
cp->mp->am_mfarray = 0;
XFREE(cp);
}
/*
* Pick a file system to try mounting and
* do that in the background if necessary
*
For each location:
discard previous mount location if required
fetch next mount location
if the filesystem failed to be mounted then
this_error = error from filesystem
goto failed
if the filesystem is mounting or unmounting then
goto retry;
if the fileserver is down then
this_error = EIO
continue;
if the filesystem is already mounted
break
fi
this_error = initialize mount point
if no error on this mount and mount is delayed then
this_error = -1
fi
if this_error < 0 then
retry = true
fi
if no error on this mount then
if mount in background then
run mount in background
return -1
else
this_error = mount in foreground
fi
fi
if an error occurred on this mount then
update stats
save error in mount point
fi
endfor
*/
static int
amfs_bgmount(struct continuation *cp)
{
am_node *mp = cp->mp;
mntfs *mf; /* Current mntfs */
int this_error = -1; /* Per-mount error */
int hard_error = -1; /* Cumulative per-node error */
if (mp->am_mnt)
free_mntfs(mp->am_mnt);
/*
* Try to mount each location.
* At the end:
* hard_error == 0 indicates something was mounted.
* hard_error > 0 indicates everything failed with a hard error
* hard_error < 0 indicates nothing could be mounted now
*/
for (mp->am_mnt = *cp->mf; *cp->mf; cp->mf++, mp->am_mnt = *cp->mf) {
am_ops *p;
mf = dup_mntfs(mp->am_mnt);
p = mf->mf_ops;
if (hard_error < 0)
hard_error = this_error;
this_error = 0;
if (mf->mf_error > 0) {
this_error = mf->mf_error;
goto failed;
}
if (mf->mf_flags & (MFF_MOUNTING | MFF_UNMOUNTING)) {
/*
* Still mounting - retry later
*/
dlog("mount of \"%s\" already pending", mf->mf_info);
goto retry;
}
if (FSRV_ISDOWN(mf->mf_server)) {
/*
* Would just mount from the same place
* as a hung mount - so give up
*/
dlog("%s is already hung - giving up", mf->mf_server->fs_host);
this_error = EIO;
goto failed;
}
if (mp->am_link) {
XFREE(mp->am_link);
mp->am_link = NULL;
}
if (mf->mf_fo && mf->mf_fo->opt_sublink)
mp->am_link = strdup(mf->mf_fo->opt_sublink);
/*
* Will usually need to play around with the mount nodes
* file attribute structure. This must be done here.
* Try and get things initialized, even if the fileserver
* is not known to be up. In the common case this will
* progress things faster.
*/
/*
* Fill in attribute fields.
*/
if (mf->mf_fsflags & FS_DIRECTORY)
mk_fattr(&mp->am_fattr, NFDIR);
else
mk_fattr(&mp->am_fattr, NFLNK);
if (mf->mf_flags & MFF_MOUNTED) {
dlog("duplicate mount of \"%s\" ...", mf->mf_info);
/*
* Skip initial processing of the mountpoint if already mounted.
* This could happen if we have multiple sublinks into the same f/s,
* or if we are restarting an already-mounted filesystem.
*/
goto already_mounted;
}
if (mf->mf_fo && mf->mf_fo->fs_mtab) {
plog(XLOG_MAP, "Trying mount of %s on %s fstype %s mount_type %s",
mf->mf_fo->fs_mtab, mf->mf_mount, p->fs_type,
mp->am_flags & AMF_AUTOFS ? "autofs" : "non-autofs");
}
if (p->fs_init && !(mf->mf_flags & MFF_RESTART))
this_error = p->fs_init(mf);
if (this_error > 0)
goto failed;
if (this_error < 0)
goto retry;
if (mf->mf_fo && mf->mf_fo->opt_delay) {
/*
* If there is a delay timer on the mount
* then don't try to mount if the timer
* has not expired.
*/
int i = atoi(mf->mf_fo->opt_delay);
time_t now = clocktime(NULL);
if (i > 0 && now < (cp->start + i)) {
dlog("Mount of %s delayed by %lds", mf->mf_mount, (long) (i - now + cp->start));
goto retry;
}
}
/*
* If the directory is not yet made and it needs to be made, then make it!
*/
if (!(mf->mf_flags & MFF_MKMNT) && mf->mf_fsflags & FS_MKMNT) {
plog(XLOG_INFO, "creating mountpoint directory '%s'", mf->mf_mount);
this_error = mkdirs(mf->mf_mount, 0555);
if (this_error) {
plog(XLOG_ERROR, "mkdirs failed: %s", strerror(this_error));
goto failed;
}
mf->mf_flags |= MFF_MKMNT;
}
#ifdef HAVE_FS_AUTOFS
if (mf->mf_flags & MFF_IS_AUTOFS)
if ((this_error = autofs_get_fh(mp)))
goto failed;
#endif /* HAVE_FS_AUTOFS */
already_mounted:
mf->mf_flags |= MFF_MOUNTING;
if (mf->mf_fsflags & FS_MBACKGROUND) {
dlog("backgrounding mount of \"%s\"", mf->mf_mount);
if (cp->callout) {
untimeout(cp->callout);
cp->callout = 0;
}
/* actually run the task, backgrounding as necessary */
run_task(mount_node, (opaque_t) mp, amfs_cont, (opaque_t) cp);
return -1;
} else {
dlog("foreground mount of \"%s\" ...", mf->mf_mount);
this_error = mount_node((opaque_t) mp);
}
mf->mf_flags &= ~MFF_MOUNTING;
if (this_error > 0)
goto failed;
if (this_error == 0) {
am_mounted(mp);
break; /* Success */
}
retry:
if (!cp->retry)
continue;
dlog("will retry ...\n");
/*
* Arrange that amfs_bgmount is called
* after anything else happens.
*/
dlog("Arranging to retry mount of %s", mp->am_path);
sched_task(amfs_retry, (opaque_t) cp, get_mntfs_wchan(mf));
if (cp->callout)
untimeout(cp->callout);
cp->callout = timeout(RETRY_INTERVAL, wakeup,
(opaque_t) get_mntfs_wchan(mf));
mp->am_ttl = clocktime(NULL) + RETRY_INTERVAL;
/*
* Not done yet - so don't return anything
*/
return -1;
failed:
amd_stats.d_merr++;
mf->mf_error = this_error;
mf->mf_flags |= MFF_ERROR;
#ifdef HAVE_FS_AUTOFS
if (mp->am_autofs_fh)
autofs_release_fh(mp);
#endif /* HAVE_FS_AUTOFS */
if (mf->mf_flags & MFF_MKMNT) {
rmdirs(mf->mf_mount);
mf->mf_flags &= ~MFF_MKMNT;
}
/*
* Wakeup anything waiting for this mount
*/
wakeup(get_mntfs_wchan(mf));
free_mntfs(mf);
/* continue */
}
/*
* If we get here, then either the mount succeeded or
* there is no more mount information available.
*/
if (this_error) {
mp->am_mnt = mf = new_mntfs();
#ifdef HAVE_FS_AUTOFS
if (mp->am_flags & AMF_AUTOFS)
autofs_mount_failed(mp);
else
#endif /* HAVE_FS_AUTOFS */
nfs_quick_reply(mp, this_error);
if (hard_error <= 0)
hard_error = this_error;
if (hard_error < 0)
hard_error = ETIMEDOUT;
/*
* Set a small(ish) timeout on an error node if
* the error was not a time out.
*/
switch (hard_error) {
case ETIMEDOUT:
case EWOULDBLOCK:
case EIO:
mp->am_timeo = 17;
break;
default:
mp->am_timeo = 5;
break;
}
new_ttl(mp);
} else {
mf = mp->am_mnt;
/*
* Wakeup anything waiting for this mount
*/
wakeup(get_mntfs_wchan(mf));
hard_error = 0;
}
/*
* Make sure that the error value in the mntfs has a
* reasonable value.
*/
if (mf->mf_error < 0) {
mf->mf_error = hard_error;
if (hard_error)
mf->mf_flags |= MFF_ERROR;
}
/*
* In any case we don't need the continuation any more
*/
free_continuation(cp);
return hard_error;
}
static char *
amfs_parse_defaults(am_node *mp, mntfs *mf, char *def_opts)
{
char *dflts;
char *dfl;
char **rvec = NULL;
struct mnt_map *mm = (mnt_map *) mf->mf_private;
dlog("determining /defaults entry value");
/*
* Find out if amd.conf overrode any map-specific /defaults.
*
* HACK ALERT: there's no easy way to find out what the map mount point is
* at this point, so I am forced to initialize the mnt_map->cfm field here
* for the first time, upon the very first search for a /defaults entry in
* this map. This initialization is much better done in mapc_create(),
* but it's impossible to do that there with the current code structure.
*/
if (mm->cfm == NULL) { /* then initialize it for first time */
mm->cfm = find_cf_map(mf->mf_mount);
}
if (mm->cfm && mm->cfm->cfm_defaults) {
dlog("map %s map_defaults override: %s", mf->mf_mount, mm->cfm->cfm_defaults);
dflts = strdup(mm->cfm->cfm_defaults);
} else if (mapc_search(mm, "/defaults", &dflts) == 0) {
dlog("/defaults gave %s", dflts);
} else {
return def_opts; /* if nothing found */
}
/* trim leading '-' in case thee's one */
if (*dflts == '-')
dfl = dflts + 1;
else
dfl = dflts;
/*
* Chop the defaults up
*/
rvec = strsplit(dfl, ' ', '\"');
if (gopt.flags & CFM_SELECTORS_IN_DEFAULTS) {
/*
* Pick whichever first entry matched the list of selectors.
* Strip the selectors from the string, and assign to dfl the
* rest of the string.
*/
if (rvec) {
am_opts ap;
am_ops *pt;
char **sp = rvec;
while (*sp) { /* loop until you find something, if any */
memset((char *) &ap, 0, sizeof(am_opts));
/*
* This next routine cause many spurious "expansion of ... is"
* messages, which are ignored, b/c all we need out of this
* routine is to match selectors. These spurious messages may
* be wrong, esp. if they try to expand ${key} b/c it will
* get expanded to "/defaults"
*/
pt = ops_match(&ap, *sp, "", mp->am_path, "/defaults",
mp->am_parent->am_mnt->mf_info);
free_opts(&ap); /* don't leak */
if (pt == &amfs_error_ops) {
plog(XLOG_MAP, "did not match defaults for \"%s\"", *sp);
} else {
dfl = strip_selectors(*sp, "/defaults");
plog(XLOG_MAP, "matched default selectors \"%s\"", dfl);
break;
}
++sp;
}
}
} else { /* not selectors_in_defaults */
/*
* Extract first value
*/
dfl = rvec[0];
}
/*
* If there were any values at all...
*/
if (dfl) {
/*
* Log error if there were other values
*/
if (!(gopt.flags & CFM_SELECTORS_IN_DEFAULTS) && rvec[1]) {
dlog("/defaults chopped into %s", dfl);
plog(XLOG_USER, "More than a single value for /defaults in %s", mf->mf_info);
}
/*
* Prepend to existing defaults if they exist,
* otherwise just use these defaults.
*/
if (*def_opts && *dfl) {
size_t l = strlen(def_opts) + strlen(dfl) + 2;
char *nopts = (char *) xmalloc(l);
xsnprintf(nopts, l, "%s;%s", dfl, def_opts);
XFREE(def_opts);
def_opts = nopts;
} else if (*dfl) {
def_opts = strealloc(def_opts, dfl);
}
}
XFREE(dflts);
/* don't need info vector any more */
if (rvec)
XFREE(rvec);
return def_opts;
}
am_node *
amfs_generic_mount_child(am_node *new_mp, int *error_return)
{
int error;
struct continuation *cp; /* Continuation structure if need to mount */
dlog("in amfs_generic_mount_child");
*error_return = error = 0; /* Error so far */
/* we have an errorfs attached to the am_node, free it */
free_mntfs(new_mp->am_mnt);
new_mp->am_mnt = 0;
/*
* Construct a continuation
*/
cp = ALLOC(struct continuation);
cp->callout = 0;
cp->mp = new_mp;
cp->retry = TRUE;
cp->start = clocktime(NULL);
cp->mf = new_mp->am_mfarray;
/*
* Try and mount the file system. If this succeeds immediately (possible
* for a ufs file system) then return the attributes, otherwise just
* return an error.
*/
error = amfs_bgmount(cp);
reschedule_timeout_mp();
if (!error)
return new_mp;
/*
* Code for quick reply. If current_transp is set, then it's the
* transp that's been passed down from nfs_program_2() or from
* autofs_program_[123]().
* If new_mp->am_transp is not already set, set it by copying in
* current_transp. Once am_transp is set, nfs_quick_reply() and
* autofs_mount_succeeded() can use it to send a reply to the
* client that requested this mount.
*/
if (current_transp && !new_mp->am_transp) {
dlog("Saving RPC transport for %s", new_mp->am_path);
new_mp->am_transp = (SVCXPRT *) xmalloc(sizeof(SVCXPRT));
*(new_mp->am_transp) = *current_transp;
}
if (error && new_mp->am_mnt && (new_mp->am_mnt->mf_ops == &amfs_error_ops))
new_mp->am_error = error;
if (new_mp->am_error > 0)
assign_error_mntfs(new_mp);
ereturn(error);
}
/*
* Automount interface to RPC lookup routine
* Find the corresponding entry and return
* the file handle for it.
*/
am_node *
amfs_generic_lookup_child(am_node *mp, char *fname, int *error_return, int op)
{
am_node *new_mp;
mntfs **mf_array;
int mp_error;
dlog("in amfs_generic_lookup_child");
*error_return = 0;
new_mp = amfs_lookup_node(mp, fname, error_return);
/* return if we got an error */
if (!new_mp || *error_return > 0)
return new_mp;
/* also return if it's already mounted and known to be up */
if (*error_return == 0 && FSRV_ISUP(new_mp->am_mnt->mf_server))
return new_mp;
switch (op) {
case VLOOK_DELETE:
/*
* If doing a delete then don't create again!
*/
ereturn(ENOENT);
case VLOOK_LOOKUP:
return new_mp;
}
/* save error_return */
mp_error = *error_return;
mf_array = amfs_lookup_mntfs(new_mp, error_return);
if (!mf_array) {
new_mp->am_error = new_mp->am_mnt->mf_error = *error_return;
free_map(new_mp);
return NULL;
}
/*
* Already mounted but known to be down:
* check if we have any alternatives to mount
*/
if (mp_error == 0) {
mntfs **mfp;
for (mfp = mf_array; *mfp; mfp++)
if (*mfp != new_mp->am_mnt)
break;
if (*mfp != NULL) {
/*
* we found an alternative, so try mounting again.
*/
*error_return = -1;
} else {
for (mfp = mf_array; *mfp; mfp++)
free_mntfs(*mfp);
XFREE(mf_array);
if (new_mp->am_flags & AMF_SOFTLOOKUP) {
ereturn(EIO);
} else {
*error_return = 0;
return new_mp;
}
}
}
/* store the array inside the am_node */
new_mp->am_mfarray = mf_array;
/*
* Note: while it might seem like a good idea to prioritize
* the list of mntfs's we got here, it probably isn't.
* It would ignore the ordering of entries specified by the user,
* which is counterintuitive and confusing.
*/
return new_mp;
}
void
amfs_generic_mounted(mntfs *mf)
{
amfs_mkcacheref(mf);
}
/*
* Unmount an automount sub-node
*/
int
amfs_generic_umount(am_node *mp, mntfs *mf)
{
int error = 0;
#ifdef HAVE_FS_AUTOFS
int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0;
if (mf->mf_flags & MFF_IS_AUTOFS)
error = UMOUNT_FS(mp->am_path, mnttab_file_name, unmount_flags);
#endif /* HAVE_FS_AUTOFS */
return error;
}
char *
amfs_generic_match(am_opts *fo)
{
char *p;
if (!fo->opt_rfs) {
plog(XLOG_USER, "amfs_generic_match: no mount point named (rfs:=)");
return 0;
}
if (!fo->opt_fs) {
plog(XLOG_USER, "amfs_generic_match: no map named (fs:=)");
return 0;
}
/*
* Swap round fs:= and rfs:= options
* ... historical (jsp)
*/
p = fo->opt_rfs;
fo->opt_rfs = fo->opt_fs;
fo->opt_fs = p;
/*
* mtab entry turns out to be the name of the mount map
*/
return strdup(fo->opt_rfs ? fo->opt_rfs : ".");
}
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