/*ARGSUSED*/
static void
autofs_zone_destructor(zoneid_t zoneid, void *arg)
{
struct autofs_globals *fngp = arg;
vnode_t *vp;
if (fngp == NULL)
return;
ASSERT(fngp->fng_fnnode_count == 1);
ASSERT(fngp->fng_unmount_threads == 0);
/*
* vn_alloc() initialized the rootnode with a count of 1; we need to
* make this 0 to placate auto_freefnnode().
*/
vp = fntovn(fngp->fng_rootfnnodep);
ASSERT(vp->v_count == 1);
vp->v_count--;
auto_freefnnode(fngp->fng_rootfnnodep);
mutex_destroy(&fngp->fng_unmount_threads_lock);
kmem_free(fngp, sizeof (*fngp));
}
/* ARGSUSED */
static int
auto_readdir(
vnode_t *vp,
uio_t *uiop,
cred_t *cred,
int *eofp,
caller_context_t *ct,
int flags)
{
struct autofs_rddirargs rda;
autofs_rddirres rd;
fnnode_t *fnp = vntofn(vp);
fnnode_t *cfnp, *nfnp;
dirent64_t *dp;
ulong_t offset;
ulong_t outcount = 0, count = 0;
size_t namelen;
ulong_t alloc_count;
void *outbuf = NULL;
fninfo_t *fnip = vfstofni(vp->v_vfsp);
struct iovec *iovp;
int error = 0;
int reached_max = 0;
int myeof = 0;
int this_reclen;
struct autofs_globals *fngp = vntofn(fnip->fi_rootvp)->fn_globals;
AUTOFS_DPRINT((4, "auto_readdir vp=%p offset=%lld\n",
(void *)vp, uiop->uio_loffset));
if (eofp != NULL)
*eofp = 0;
if (uiop->uio_iovcnt != 1)
return (EINVAL);
iovp = uiop->uio_iov;
alloc_count = iovp->iov_len;
gethrestime(&fnp->fn_atime);
fnp->fn_ref_time = fnp->fn_atime.tv_sec;
dp = outbuf = kmem_zalloc(alloc_count, KM_SLEEP);
/*
* Held when getdents calls VOP_RWLOCK....
*/
ASSERT(RW_READ_HELD(&fnp->fn_rwlock));
if (uiop->uio_offset >= AUTOFS_DAEMONCOOKIE) {
again:
/*
* Do readdir of daemon contents only
* Drop readers lock and reacquire after reply.
*/
rw_exit(&fnp->fn_rwlock);
bzero(&rd, sizeof (struct autofs_rddirres));
count = 0;
rda.rda_map = fnip->fi_map;
rda.rda_offset = (uint_t)uiop->uio_offset;
rd.rd_rddir.rddir_entries = dp;
rda.rda_count = rd.rd_rddir.rddir_size = (uint_t)alloc_count;
rda.uid = crgetuid(cred);
error = auto_calldaemon(fngp->fng_zoneid,
AUTOFS_READDIR,
xdr_autofs_rddirargs,
&rda,
xdr_autofs_rddirres,
(void *)&rd,
sizeof (autofs_rddirres),
TRUE);
/*
* reacquire previously dropped lock
*/
rw_enter(&fnp->fn_rwlock, RW_READER);
if (!error) {
error = rd.rd_status;
dp = rd.rd_rddir.rddir_entries;
}
if (error) {
if (error == AUTOFS_SHUTDOWN) {
/*
* treat as empty directory
*/
error = 0;
myeof = 1;
if (eofp)
*eofp = 1;
}
goto done;
}
if (rd.rd_rddir.rddir_size) {
dirent64_t *odp = dp; /* next in output buffer */
dirent64_t *cdp = dp; /* current examined entry */
/*
* Check for duplicates here
*/
do {
this_reclen = cdp->d_reclen;
if (auto_search(fnp, cdp->d_name,
NULL, cred)) {
/*
* entry not found in kernel list,
* include it in readdir output.
*
* If we are skipping entries. then
* we need to copy this entry to the
* correct position in the buffer
* to be copied out.
*/
if (cdp != odp)
bcopy(cdp, odp,
(size_t)this_reclen);
odp = nextdp(odp);
outcount += this_reclen;
} else {
/*
* Entry was found in the kernel
* list. If it is the first entry
* in this buffer, then just skip it
*/
if (odp == dp) {
dp = nextdp(dp);
odp = dp;
}
}
count += this_reclen;
cdp = (struct dirent64 *)
((char *)cdp + this_reclen);
} while (count < rd.rd_rddir.rddir_size);
if (outcount)
error = uiomove(dp, outcount, UIO_READ, uiop);
uiop->uio_offset = rd.rd_rddir.rddir_offset;
} else {
if (rd.rd_rddir.rddir_eof == 0) {
/*
* alloc_count not large enough for one
* directory entry
*/
error = EINVAL;
}
}
if (rd.rd_rddir.rddir_eof && !error) {
myeof = 1;
if (eofp)
*eofp = 1;
}
if (!error && !myeof && outcount == 0) {
/*
* call daemon with new cookie, all previous
* elements happened to be duplicates
*/
dp = outbuf;
goto again;
}
goto done;
}
if (uiop->uio_offset == 0) {
/*
* first time: so fudge the . and ..
*/
this_reclen = DIRENT64_RECLEN(1);
if (alloc_count < this_reclen) {
error = EINVAL;
goto done;
}
dp->d_ino = (ino64_t)fnp->fn_nodeid;
dp->d_off = (off64_t)1;
dp->d_reclen = (ushort_t)this_reclen;
/* use strncpy(9f) to zero out uninitialized bytes */
(void) strncpy(dp->d_name, ".",
DIRENT64_NAMELEN(this_reclen));
outcount += dp->d_reclen;
dp = nextdp(dp);
this_reclen = DIRENT64_RECLEN(2);
if (alloc_count < outcount + this_reclen) {
error = EINVAL;
goto done;
}
dp->d_reclen = (ushort_t)this_reclen;
dp->d_ino = (ino64_t)fnp->fn_parent->fn_nodeid;
dp->d_off = (off64_t)2;
/* use strncpy(9f) to zero out uninitialized bytes */
(void) strncpy(dp->d_name, "..",
DIRENT64_NAMELEN(this_reclen));
outcount += dp->d_reclen;
dp = nextdp(dp);
}
offset = 2;
cfnp = fnp->fn_dirents;
while (cfnp != NULL) {
nfnp = cfnp->fn_next;
offset = cfnp->fn_offset;
if ((offset >= uiop->uio_offset) &&
(!(cfnp->fn_flags & MF_LOOKUP))) {
int reclen;
/*
* include node only if its offset is greater or
* equal to the one required and it is not in
* transient state (not being looked-up)
*/
namelen = strlen(cfnp->fn_name);
reclen = (int)DIRENT64_RECLEN(namelen);
if (outcount + reclen > alloc_count) {
reached_max = 1;
break;
}
dp->d_reclen = (ushort_t)reclen;
dp->d_ino = (ino64_t)cfnp->fn_nodeid;
if (nfnp != NULL) {
/*
* get the offset of the next element
*/
dp->d_off = (off64_t)nfnp->fn_offset;
} else {
/*
* This is the last element, make
* offset one plus the current
*/
dp->d_off = (off64_t)cfnp->fn_offset + 1;
}
/* use strncpy(9f) to zero out uninitialized bytes */
(void) strncpy(dp->d_name, cfnp->fn_name,
DIRENT64_NAMELEN(reclen));
outcount += dp->d_reclen;
dp = nextdp(dp);
}
cfnp = nfnp;
}
if (outcount)
error = uiomove(outbuf, outcount, UIO_READ, uiop);
if (!error) {
if (reached_max) {
/*
* This entry did not get added to the buffer on this,
* call. We need to add it on the next call therefore
* set uio_offset to this entry's offset. If there
* wasn't enough space for one dirent, return EINVAL.
*/
uiop->uio_offset = offset;
if (outcount == 0)
error = EINVAL;
} else if (autofs_nobrowse ||
auto_nobrowse_option(fnip->fi_opts) ||
(fnip->fi_flags & MF_DIRECT) ||
(fnp->fn_trigger != NULL) ||
(((vp->v_flag & VROOT) == 0) &&
((fntovn(fnp->fn_parent))->v_flag & VROOT) &&
(fnp->fn_dirents == NULL))) {
/*
* done reading directory entries
*/
uiop->uio_offset = offset + 1;
if (eofp)
*eofp = 1;
} else {
/*
* Need to get the rest of the entries from the daemon.
*/
uiop->uio_offset = AUTOFS_DAEMONCOOKIE;
}
}
done:
kmem_free(outbuf, alloc_count);
AUTOFS_DPRINT((5, "auto_readdir vp=%p offset=%lld eof=%d\n",
(void *)vp, uiop->uio_loffset, myeof));
return (error);
}
static int
auto_lookup(
vnode_t *dvp,
char *nm,
vnode_t **vpp,
pathname_t *pnp,
int flags,
vnode_t *rdir,
cred_t *cred,
caller_context_t *ct,
int *direntflags,
pathname_t *realpnp)
{
int error = 0;
vnode_t *newvp = NULL;
vfs_t *vfsp;
fninfo_t *dfnip;
fnnode_t *dfnp = NULL;
fnnode_t *fnp = NULL;
char *searchnm;
int operation; /* either AUTOFS_LOOKUP or AUTOFS_MOUNT */
dfnip = vfstofni(dvp->v_vfsp);
AUTOFS_DPRINT((3, "auto_lookup: dvp=%p (%s) name=%s\n",
(void *)dvp, dfnip->fi_map, nm));
if (nm[0] == 0) {
VN_HOLD(dvp);
*vpp = dvp;
return (0);
}
if (error = VOP_ACCESS(dvp, VEXEC, 0, cred, ct))
return (error);
if (nm[0] == '.' && nm[1] == 0) {
VN_HOLD(dvp);
*vpp = dvp;
return (0);
}
if (nm[0] == '.' && nm[1] == '.' && nm[2] == 0) {
fnnode_t *pdfnp;
pdfnp = (vntofn(dvp))->fn_parent;
ASSERT(pdfnp != NULL);
/*
* Since it is legitimate to have the VROOT flag set for the
* subdirectories of the indirect map in autofs filesystem,
* rootfnnodep is checked against fnnode of dvp instead of
* just checking whether VROOT flag is set in dvp
*/
if (pdfnp == pdfnp->fn_globals->fng_rootfnnodep) {
vnode_t *vp;
vfs_rlock_wait(dvp->v_vfsp);
if (dvp->v_vfsp->vfs_flag & VFS_UNMOUNTED) {
vfs_unlock(dvp->v_vfsp);
return (EIO);
}
vp = dvp->v_vfsp->vfs_vnodecovered;
VN_HOLD(vp);
vfs_unlock(dvp->v_vfsp);
error = VOP_LOOKUP(vp, nm, vpp, pnp, flags, rdir, cred,
ct, direntflags, realpnp);
VN_RELE(vp);
return (error);
} else {
*vpp = fntovn(pdfnp);
VN_HOLD(*vpp);
return (0);
}
}
top:
dfnp = vntofn(dvp);
searchnm = nm;
operation = 0;
ASSERT(vn_matchops(dvp, auto_vnodeops));
AUTOFS_DPRINT((3, "auto_lookup: dvp=%p dfnp=%p\n", (void *)dvp,
(void *)dfnp));
/*
* If a lookup or mount of this node is in progress, wait for it
* to finish, and return whatever result it got.
*/
mutex_enter(&dfnp->fn_lock);
if (dfnp->fn_flags & (MF_LOOKUP | MF_INPROG)) {
mutex_exit(&dfnp->fn_lock);
error = auto_wait4mount(dfnp);
if (error == AUTOFS_SHUTDOWN)
error = ENOENT;
if (error == EAGAIN)
goto top;
if (error)
return (error);
} else
mutex_exit(&dfnp->fn_lock);
error = vn_vfsrlock_wait(dvp);
if (error)
return (error);
vfsp = vn_mountedvfs(dvp);
if (vfsp != NULL) {
error = VFS_ROOT(vfsp, &newvp);
vn_vfsunlock(dvp);
if (!error) {
error = VOP_LOOKUP(newvp, nm, vpp, pnp,
flags, rdir, cred, ct, direntflags, realpnp);
VN_RELE(newvp);
}
return (error);
}
vn_vfsunlock(dvp);
rw_enter(&dfnp->fn_rwlock, RW_READER);
error = auto_search(dfnp, nm, &fnp, cred);
if (error) {
if (dfnip->fi_flags & MF_DIRECT) {
/*
* direct map.
*/
if (dfnp->fn_dirents) {
/*
* Mount previously triggered.
* 'nm' not found
*/
error = ENOENT;
} else {
/*
* I need to contact the daemon to trigger
* the mount. 'dfnp' will be the mountpoint.
*/
operation = AUTOFS_MOUNT;
VN_HOLD(fntovn(dfnp));
fnp = dfnp;
error = 0;
}
} else if (dvp == dfnip->fi_rootvp) {
/*
* 'dfnp' is the root of the indirect AUTOFS.
*/
if (rw_tryupgrade(&dfnp->fn_rwlock) == 0) {
/*
* Could not acquire writer lock, release
* reader, and wait until available. We
* need to search for 'nm' again, since we
* had to release the lock before reacquiring
* it.
*/
rw_exit(&dfnp->fn_rwlock);
rw_enter(&dfnp->fn_rwlock, RW_WRITER);
error = auto_search(dfnp, nm, &fnp, cred);
}
ASSERT(RW_WRITE_HELD(&dfnp->fn_rwlock));
if (error) {
/*
* create node being looked-up and request
* mount on it.
*/
error = auto_enter(dfnp, nm, &fnp, kcred);
if (!error)
operation = AUTOFS_LOOKUP;
}
} else if ((dfnp->fn_dirents == NULL) &&
((dvp->v_flag & VROOT) == 0) &&
((fntovn(dfnp->fn_parent))->v_flag & VROOT)) {
/*
* dfnp is the actual 'mountpoint' of indirect map,
* it is the equivalent of a direct mount,
* ie, /home/'user1'
*/
operation = AUTOFS_MOUNT;
VN_HOLD(fntovn(dfnp));
fnp = dfnp;
error = 0;
searchnm = dfnp->fn_name;
}
}
if (error == EAGAIN) {
rw_exit(&dfnp->fn_rwlock);
goto top;
}
if (error) {
rw_exit(&dfnp->fn_rwlock);
return (error);
}
/*
* We now have the actual fnnode we're interested in.
* The 'MF_LOOKUP' indicates another thread is currently
* performing a daemon lookup of this node, therefore we
* wait for its completion.
* The 'MF_INPROG' indicates another thread is currently
* performing a daemon mount of this node, we wait for it
* to be done if we are performing a MOUNT. We don't
* wait for it if we are performing a LOOKUP.
* We can release the reader/writer lock as soon as we acquire
* the mutex, since the state of the lock can only change by
* first acquiring the mutex.
*/
mutex_enter(&fnp->fn_lock);
rw_exit(&dfnp->fn_rwlock);
if ((fnp->fn_flags & MF_LOOKUP) ||
((operation == AUTOFS_MOUNT) && (fnp->fn_flags & MF_INPROG))) {
mutex_exit(&fnp->fn_lock);
error = auto_wait4mount(fnp);
VN_RELE(fntovn(fnp));
if (error == AUTOFS_SHUTDOWN)
error = ENOENT;
if (error && error != EAGAIN)
return (error);
goto top;
}
if (operation == 0) {
/*
* got the fnnode, check for any errors
* on the previous operation on that node.
*/
error = fnp->fn_error;
if ((error == EINTR) || (error == EAGAIN)) {
/*
* previous operation on this node was
* not completed, do a lookup now.
*/
operation = AUTOFS_LOOKUP;
} else {
/*
* previous operation completed. Return
* a pointer to the node only if there was
* no error.
*/
mutex_exit(&fnp->fn_lock);
if (!error)
*vpp = fntovn(fnp);
else
VN_RELE(fntovn(fnp));
return (error);
}
}
/*
* Since I got to this point, it means I'm the one
* responsible for triggering the mount/look-up of this node.
*/
switch (operation) {
case AUTOFS_LOOKUP:
AUTOFS_BLOCK_OTHERS(fnp, MF_LOOKUP);
fnp->fn_error = 0;
mutex_exit(&fnp->fn_lock);
error = auto_lookup_aux(fnp, searchnm, cred);
if (!error) {
/*
* Return this vnode
*/
*vpp = fntovn(fnp);
} else {
/*
* release our reference to this vnode
* and return error
*/
VN_RELE(fntovn(fnp));
}
break;
case AUTOFS_MOUNT:
AUTOFS_BLOCK_OTHERS(fnp, MF_INPROG);
fnp->fn_error = 0;
mutex_exit(&fnp->fn_lock);
/*
* auto_new_mount_thread fires up a new thread which
* calls automountd finishing up the work
*/
auto_new_mount_thread(fnp, searchnm, cred);
/*
* At this point, we are simply another thread
* waiting for the mount to complete
*/
error = auto_wait4mount(fnp);
if (error == AUTOFS_SHUTDOWN)
error = ENOENT;
/*
* now release our reference to this vnode
*/
VN_RELE(fntovn(fnp));
if (!error)
goto top;
break;
default:
auto_log(dfnp->fn_globals->fng_verbose,
dfnp->fn_globals->fng_zoneid, CE_WARN,
"auto_lookup: unknown operation %d",
operation);
}
AUTOFS_DPRINT((5, "auto_lookup: name=%s *vpp=%p return=%d\n",
nm, (void *)*vpp, error));
return (error);
}
/*
* Triggers the mount if needed. If the mount has been triggered by
* another thread, it will wait for its return status, and return it.
* Whether the mount is triggered by this thread, another thread, or
* if the vnode was already covered, '*newvp' is a
* VN_HELD vnode pointing to the root of the filesystem covering 'vp'.
* If the node is not mounted on, and should not be mounted on, '*newvp'
* will be NULL.
* The calling routine may use '*newvp' to do the filesystem jump.
*/
static int
auto_trigger_mount(vnode_t *vp, cred_t *cred, vnode_t **newvp)
{
fnnode_t *fnp = vntofn(vp);
fninfo_t *fnip = vfstofni(vp->v_vfsp);
vnode_t *dvp;
vfs_t *vfsp;
int delayed_ind;
char name[AUTOFS_MAXPATHLEN];
int error;
AUTOFS_DPRINT((4, "auto_trigger_mount: vp=%p\n", (void *)vp));
*newvp = NULL;
/*
* Cross-zone mount triggering is disallowed.
*/
if (fnip->fi_zoneid != getzoneid())
return (EPERM); /* Not owner of mount */
retry:
error = 0;
delayed_ind = 0;
mutex_enter(&fnp->fn_lock);
while (fnp->fn_flags & (MF_LOOKUP | MF_INPROG)) {
/*
* Mount or lookup in progress,
* wait for it before proceeding.
*/
mutex_exit(&fnp->fn_lock);
error = auto_wait4mount(fnp);
if (error == AUTOFS_SHUTDOWN) {
error = 0;
goto done;
}
if (error && error != EAGAIN)
goto done;
error = 0;
mutex_enter(&fnp->fn_lock);
}
/*
* If the vfslock can't be acquired for the first time.
* drop the fn_lock and retry next time in blocking mode.
*/
if (vn_vfswlock(vp)) {
/*
* Lock held by another thread.
* Perform blocking by dropping the
* fn_lock.
*/
mutex_exit(&fnp->fn_lock);
error = vn_vfswlock_wait(vp);
if (error)
goto done;
/*
* Because fn_lock wasn't held, the state
* of the trigger node might have changed.
* Need to run through the checks on trigger
* node again.
*/
vn_vfsunlock(vp);
goto retry;
}
vfsp = vn_mountedvfs(vp);
if (vfsp != NULL) {
mutex_exit(&fnp->fn_lock);
error = VFS_ROOT(vfsp, newvp);
vn_vfsunlock(vp);
goto done;
} else {
vn_vfsunlock(vp);
if ((fnp->fn_flags & MF_MOUNTPOINT) &&
fnp->fn_trigger != NULL) {
ASSERT(fnp->fn_dirents == NULL);
mutex_exit(&fnp->fn_lock);
/*
* The filesystem that used to sit here has been
* forcibly unmounted. Do our best to recover.
* Try to unmount autofs subtree below this node
* and retry the action.
*/
if (unmount_subtree(fnp, B_TRUE) != 0) {
error = EIO;
goto done;
}
goto retry;
}
}
ASSERT(vp->v_type == VDIR);
dvp = fntovn(fnp->fn_parent);
if ((fnp->fn_dirents == NULL) &&
((fnip->fi_flags & MF_DIRECT) == 0) &&
((vp->v_flag & VROOT) == 0) &&
(dvp->v_flag & VROOT)) {
/*
* If the parent of this node is the root of an indirect
* AUTOFS filesystem, this node is remountable.
*/
delayed_ind = 1;
}
if (delayed_ind ||
((fnip->fi_flags & MF_DIRECT) && (fnp->fn_dirents == NULL))) {
/*
* Trigger mount since:
* direct mountpoint with no subdirs or
* delayed indirect.
*/
AUTOFS_BLOCK_OTHERS(fnp, MF_INPROG);
fnp->fn_error = 0;
mutex_exit(&fnp->fn_lock);
if (delayed_ind)
(void) strcpy(name, fnp->fn_name);
else
(void) strcpy(name, ".");
fnp->fn_ref_time = gethrestime_sec();
auto_new_mount_thread(fnp, name, cred);
/*
* At this point we're simply another thread waiting
* for the mount to finish.
*/
error = auto_wait4mount(fnp);
if (error == EAGAIN)
goto retry;
if (error == AUTOFS_SHUTDOWN) {
error = 0;
goto done;
}
if (error == 0) {
if (error = vn_vfsrlock_wait(vp))
goto done;
/* Reacquire after dropping locks */
vfsp = vn_mountedvfs(vp);
if (vfsp != NULL) {
error = VFS_ROOT(vfsp, newvp);
vn_vfsunlock(vp);
} else {
vn_vfsunlock(vp);
goto retry;
}
}
} else
mutex_exit(&fnp->fn_lock);
done:
AUTOFS_DPRINT((5, "auto_trigger_mount: error=%d\n", error));
return (error);
}
