File: [Development] / linux-2.6-xfs / fs / dmapi / dmapi_register.c (download)
Revision 1.19, Wed Oct 9 03:04:20 2002 UTC (15 years ago) by nathans
Branch: MAIN
Changes since 1.18: +12 -13
lines
Global search and replace of the b* memory routines to their mem* equivalents.
(bcopy->memcopy, ovbcopy->memmove, bzero->memset, bcmp->memcmp).
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/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#include "dmapi_private.h"
#include <linux/mm.h>
#include <linux/proc_fs.h>
#include <linux/module.h>
dm_fsreg_t *dm_registers; /* head of filesystem registration list */
int dm_fsys_cnt; /* number of filesystems on dm_registers list */
lock_t dm_reg_lock = SPIN_LOCK_UNLOCKED;/* lock for dm_registers */
#ifdef CONFIG_PROC_FS
static int
fsreg_read_pfs(char *buffer, char **start, off_t offset,
int count, int *eof, void *data)
{
int len;
int i;
dm_fsreg_t *fsrp = (dm_fsreg_t*)data;
char statebuf[30];
#define CHKFULL if(len >= count) break;
#define ADDBUF(a,b) len += sprintf(buffer + len, a, b); CHKFULL;
switch (fsrp->fr_state) {
case DM_STATE_MOUNTING: sprintf(statebuf, "mounting"); break;
case DM_STATE_MOUNTED: sprintf(statebuf, "mounted"); break;
case DM_STATE_UNMOUNTING: sprintf(statebuf, "unmounting"); break;
case DM_STATE_UNMOUNTED: sprintf(statebuf, "unmounted"); break;
default:
sprintf(statebuf, "unknown:%d", (int)fsrp->fr_state);
break;
}
len=0;
while(1){
ADDBUF("fsrp=0x%p\n", fsrp);
ADDBUF("fr_next=0x%p\n", fsrp->fr_next);
ADDBUF("fr_vfsp=0x%p\n", fsrp->fr_vfsp);
ADDBUF("fr_tevp=0x%p\n", fsrp->fr_tevp);
ADDBUF("fr_fsid=%c\n", '?');
ADDBUF("fr_msg=0x%p\n", fsrp->fr_msg);
ADDBUF("fr_msgsize=%d\n", fsrp->fr_msgsize);
ADDBUF("fr_state=%s\n", statebuf);
ADDBUF("fr_dispq=%c\n", '?');
ADDBUF("fr_dispcnt=%d\n", fsrp->fr_dispcnt);
ADDBUF("fr_evt_dispq.eq_head=0x%p\n", fsrp->fr_evt_dispq.eq_head);
ADDBUF("fr_evt_dispq.eq_tail=0x%p\n", fsrp->fr_evt_dispq.eq_tail);
ADDBUF("fr_evt_dispq.eq_count=%d\n", fsrp->fr_evt_dispq.eq_count);
ADDBUF("fr_queue=%c\n", '?');
ADDBUF("fr_lock=%c\n", '?');
ADDBUF("fr_hdlcnt=%d\n", fsrp->fr_hdlcnt);
ADDBUF("fr_vfscnt=%d\n", fsrp->fr_vfscnt);
ADDBUF("fr_unmount=%d\n", fsrp->fr_unmount);
len += sprintf(buffer + len, "fr_rattr=");
CHKFULL;
for(i = 0; i <= DM_ATTR_NAME_SIZE; ++i){
ADDBUF("%c", fsrp->fr_rattr.an_chars[i]);
}
CHKFULL;
len += sprintf(buffer + len, "\n");
CHKFULL;
for(i = 0; i < DM_EVENT_MAX; i++){
if( fsrp->fr_sessp[i] != NULL ){
ADDBUF("fr_sessp[%d]=", i);
ADDBUF("0x%p\n", fsrp->fr_sessp[i]);
}
}
CHKFULL;
break;
}
if (offset >= len) {
*start = buffer;
*eof = 1;
return 0;
}
*start = buffer + offset;
if ((len -= offset) > count)
return count;
*eof = 1;
return len;
}
#endif
/* Returns a pointer to the filesystem structure for the filesystem
referenced by vfsp. The caller is responsible for obtaining dm_reg_lock
before calling this routine.
*/
static dm_fsreg_t *
dm_find_fsreg(
fsid_t *fsidp)
{
dm_fsreg_t *fsrp;
for (fsrp = dm_registers; fsrp; fsrp = fsrp->fr_next) {
if (!memcmp(&fsrp->fr_fsid, fsidp, sizeof(*fsidp)))
break;
}
return(fsrp);
}
/* Given a fsid_t, dm_find_fsreg_and_lock() finds the dm_fsreg_t structure
for that filesytem if one exists, and returns a pointer to the structure
after obtaining its 'fr_lock' so that the caller can safely modify the
dm_fsreg_t. The caller is responsible for releasing 'fr_lock'.
*/
static dm_fsreg_t *
dm_find_fsreg_and_lock(
fsid_t *fsidp,
unsigned long *lcp) /* address of returned lock cookie */
{
dm_fsreg_t *fsrp;
for (;;) {
*lcp = mutex_spinlock(&dm_reg_lock);
if ((fsrp = dm_find_fsreg(fsidp)) == NULL) {
mutex_spinunlock(&dm_reg_lock, *lcp);
return(NULL);
}
if (spin_trylock(&fsrp->fr_lock)) {
nested_spinunlock(&dm_reg_lock);
return(fsrp); /* success */
}
/* If the second lock is not available, drop the first and
start over. This gives the CPU a chance to process any
interrupts, and also allows processes which want a fr_lock
for a different filesystem to proceed.
*/
mutex_spinunlock(&dm_reg_lock, *lcp);
}
}
/* dm_add_fsys_entry() is called when a DM_EVENT_MOUNT event is about to be
sent. It creates a dm_fsreg_t structure for the filesystem and stores a
pointer to a copy of the mount event within that structure so that it is
available for subsequent dm_get_mountinfo() calls.
*/
int
dm_add_fsys_entry(
vfs_t *vfsp,
dm_tokevent_t *tevp)
{
dm_fsreg_t *fsrp;
int msgsize;
void *msg;
unsigned long lc; /* lock cookie */
/* Allocate and initialize a dm_fsreg_t structure for the filesystem. */
msgsize = tevp->te_allocsize - offsetof(dm_tokevent_t, te_event);
msg = kmalloc(msgsize, GFP_KERNEL);
if (msg == NULL) {
printk("%s/%d: kmalloc returned NULL\n", __FUNCTION__, __LINE__);
return ENOMEM;
}
memcpy(msg, &tevp->te_event, msgsize);
fsrp = kmem_cache_alloc(dm_fsreg_cachep, SLAB_KERNEL);
if (fsrp == NULL) {
kfree(msg);
printk("%s/%d: kmem_cache_alloc(dm_fsreg_cachep) returned NULL\n", __FUNCTION__, __LINE__);
return ENOMEM;
}
memset(fsrp, 0, sizeof(*fsrp));
fsrp->fr_vfsp = vfsp;
fsrp->fr_tevp = tevp;
fsrp->fr_fsid = *vfsp->vfs_altfsid;
fsrp->fr_msg = msg;
fsrp->fr_msgsize = msgsize;
fsrp->fr_state = DM_STATE_MOUNTING;
sv_init(&fsrp->fr_dispq, SV_DEFAULT, "fr_dispq");
sv_init(&fsrp->fr_queue, SV_DEFAULT, "fr_queue");
spinlock_init(&fsrp->fr_lock, "fr_lock");
/* If no other mounted DMAPI filesystem already has this same
fsid_t, then add this filesystem to the list.
*/
lc = mutex_spinlock(&dm_reg_lock);
if (!dm_find_fsreg(vfsp->vfs_altfsid)) {
fsrp->fr_next = dm_registers;
dm_registers = fsrp;
dm_fsys_cnt++;
#ifdef CONFIG_PROC_FS
{
char buf[100];
struct proc_dir_entry *entry;
sprintf(buf, DMAPI_DBG_PROCFS "/fsreg/0x%p", fsrp);
entry = create_proc_read_entry(buf, 0, 0, fsreg_read_pfs, fsrp);
entry->owner = THIS_MODULE;
}
#endif
mutex_spinunlock(&dm_reg_lock, lc);
return(0);
}
/* A fsid_t collision occurred, so prevent this new filesystem from
mounting.
*/
mutex_spinunlock(&dm_reg_lock, lc);
sv_destroy(&fsrp->fr_dispq);
sv_destroy(&fsrp->fr_queue);
spinlock_destroy(&fsrp->fr_lock);
kfree(msg);
kmem_cache_free(dm_fsreg_cachep, fsrp);
return(EBUSY);
}
/* dm_change_fsys_entry() is called whenever a filesystem's mount state is
about to change. The state is changed to DM_STATE_MOUNTED after a
successful DM_EVENT_MOUNT event or after a failed unmount. It is changed
to DM_STATE_UNMOUNTING after a successful DM_EVENT_PREUNMOUNT event.
Finally, the state is changed to DM_STATE_UNMOUNTED after a successful
unmount. It stays in this state until the DM_EVENT_UNMOUNT event is
queued, at which point the filesystem entry is removed.
*/
void
dm_change_fsys_entry(
vfs_t *vfsp,
dm_fsstate_t newstate)
{
dm_fsreg_t *fsrp;
int seq_error;
unsigned long lc; /* lock cookie */
/* Find the filesystem referenced by the vfsp's fsid_t. This should
always succeed.
*/
if ((fsrp = dm_find_fsreg_and_lock(vfsp->vfs_altfsid, &lc)) == NULL) {
panic("dm_change_fsys_entry: can't find DMAPI fsrp for "
"vfsp %p\n", vfsp);
}
/* Make sure that the new state is acceptable given the current state
of the filesystem. Any error here is a major DMAPI/filesystem
screwup.
*/
seq_error = 0;
switch (newstate) {
case DM_STATE_MOUNTED:
if (fsrp->fr_state != DM_STATE_MOUNTING &&
fsrp->fr_state != DM_STATE_UNMOUNTING) {
seq_error++;
}
break;
case DM_STATE_UNMOUNTING:
if (fsrp->fr_state != DM_STATE_MOUNTED)
seq_error++;
break;
case DM_STATE_UNMOUNTED:
if (fsrp->fr_state != DM_STATE_UNMOUNTING)
seq_error++;
break;
default:
seq_error++;
break;
}
if (seq_error) {
panic("dm_change_fsys_entry: DMAPI sequence error: old state "
"%d, new state %d, fsrp %p\n", fsrp->fr_state,
newstate, fsrp);
}
/* If the old state was DM_STATE_UNMOUNTING, then processes could be
sleeping in dm_handle_to_vp() waiting for their DM_NO_TOKEN handles
to be translated to vnodes. Wake them up so that they either
continue (new state is DM_STATE_MOUNTED) or fail (new state is
DM_STATE_UNMOUNTED).
*/
if (fsrp->fr_state == DM_STATE_UNMOUNTING) {
if (fsrp->fr_hdlcnt)
sv_broadcast(&fsrp->fr_queue);
}
/* Change the filesystem's mount state to its new value. */
fsrp->fr_state = newstate;
fsrp->fr_tevp = NULL; /* not valid after DM_STATE_MOUNTING */
/* If the new state is DM_STATE_UNMOUNTING, wait until any application
threads currently in the process of making VFS_VGET and VFS_ROOT
calls are done before we let this unmount thread continue the
unmount. (We want to make sure that the unmount will see these
vnode references during its scan.)
*/
if (newstate == DM_STATE_UNMOUNTING) {
while (fsrp->fr_vfscnt) {
fsrp->fr_unmount++;
sv_wait(&fsrp->fr_queue, 1, &fsrp->fr_lock, lc);
lc = mutex_spinlock(&fsrp->fr_lock);
fsrp->fr_unmount--;
}
}
mutex_spinunlock(&fsrp->fr_lock, lc);
}
/* dm_remove_fsys_entry() gets called after a failed mount or after an
DM_EVENT_UNMOUNT event has been queued. (The filesystem entry must stay
until the DM_EVENT_UNMOUNT reply is queued so that the event can use the
'fr_sessp' list to see which session to send the event to.)
*/
void
dm_remove_fsys_entry(
vfs_t *vfsp)
{
dm_fsreg_t **fsrpp;
dm_fsreg_t *fsrp;
unsigned long lc; /* lock cookie */
/* Find the filesystem referenced by the vfsp's fsid_t and dequeue
it after verifying that the fr_state shows a filesystem that is
either mounting or unmounted.
*/
lc = mutex_spinlock(&dm_reg_lock);
fsrpp = &dm_registers;
while ((fsrp = *fsrpp) != NULL) {
if (!memcmp(&fsrp->fr_fsid, vfsp->vfs_altfsid, sizeof(fsrp->fr_fsid)))
break;
fsrpp = &fsrp->fr_next;
}
if (fsrp == NULL) {
mutex_spinunlock(&dm_reg_lock, lc);
panic("dm_remove_fsys_entry: can't find DMAPI fsrp for "
"vfsp %p\n", vfsp);
}
nested_spinlock(&fsrp->fr_lock);
/* Verify that it makes sense to remove this entry. */
if (fsrp->fr_state != DM_STATE_MOUNTING &&
fsrp->fr_state != DM_STATE_UNMOUNTED) {
nested_spinunlock(&fsrp->fr_lock);
mutex_spinunlock(&dm_reg_lock, lc);
panic("dm_remove_fsys_entry: DMAPI sequence error: old state "
"%d, fsrp %p\n", fsrp->fr_state, fsrp);
}
*fsrpp = fsrp->fr_next;
dm_fsys_cnt--;
nested_spinunlock(&dm_reg_lock);
/* Since the filesystem is about to finish unmounting, we must be sure
that no vnodes are being referenced within the filesystem before we
let this event thread continue. If the filesystem is currently in
state DM_STATE_MOUNTING, then we know by definition that there can't
be any references. If the filesystem is DM_STATE_UNMOUNTED, then
any application threads referencing handles with DM_NO_TOKEN should
have already been awakened by dm_change_fsys_entry and should be
long gone by now. Just in case they haven't yet left, sleep here
until they are really gone.
*/
while (fsrp->fr_hdlcnt) {
fsrp->fr_unmount++;
sv_wait(&fsrp->fr_queue, 1, &fsrp->fr_lock, lc);
lc = mutex_spinlock(&fsrp->fr_lock);
fsrp->fr_unmount--;
}
mutex_spinunlock(&fsrp->fr_lock, lc);
/* Release all memory. */
#ifdef CONFIG_PROC_FS
{
char buf[100];
sprintf(buf, DMAPI_DBG_PROCFS "/fsreg/0x%p", fsrp);
remove_proc_entry(buf, NULL);
}
#endif
sv_destroy(&fsrp->fr_dispq);
sv_destroy(&fsrp->fr_queue);
spinlock_destroy(&fsrp->fr_lock);
kfree(fsrp->fr_msg);
kmem_cache_free(dm_fsreg_cachep, fsrp);
}
/* Get a vnode for the object referenced by handlep. We cannot use
altgetvfs() because it fails if the VFS_OFFLINE bit is set, which means
that any call to dm_handle_to_vp() while a umount is in progress would
return an error, even if the umount can't possibly succeed because users
are in the filesystem. The requests would start to fail as soon as the
umount begins, even before the application receives the DM_EVENT_PREUNMOUNT
event.
dm_handle_to_vp() emulates the behavior of lookup() while an unmount is
in progress. Any call to dm_handle_to_vp() while the filesystem is in the
DM_STATE_UNMOUNTING state will block. If the unmount eventually succeeds,
the requests will wake up and fail. If the unmount fails, the requests will
wake up and complete normally.
While a filesystem is in state DM_STATE_MOUNTING, dm_handle_to_vp() will
fail all requests. Per the DMAPI spec, the only handles in the filesystem
which are valid during a mount event are the handles within the event
itself.
*/
vnode_t *
dm_handle_to_vp(
xfs_handle_t *handlep,
short *typep)
{
dm_fsreg_t *fsrp;
vnode_t *vp;
short type;
unsigned long lc; /* lock cookie */
int error;
fid_t *fidp;
if ((fsrp = dm_find_fsreg_and_lock((fsid_t*)&handlep->ha_fsid, &lc)) == NULL)
return(NULL);
fidp = (fid_t*)&handlep->ha_fid;
/* If mounting, and we are not asking for a filesystem handle,
* then fail the request. (fid_len==0 for fshandle)
*/
if ((fsrp->fr_state == DM_STATE_MOUNTING) &&
(fidp->fid_len != 0)) {
mutex_spinunlock(&fsrp->fr_lock, lc);
return(NULL);
}
for (;;) {
if (fsrp->fr_state == DM_STATE_MOUNTING)
break;
if (fsrp->fr_state == DM_STATE_MOUNTED)
break;
if (fsrp->fr_state == DM_STATE_UNMOUNTED) {
if (fsrp->fr_unmount && fsrp->fr_hdlcnt == 0)
sv_broadcast(&fsrp->fr_queue);
mutex_spinunlock(&fsrp->fr_lock, lc);
return(NULL);
}
/* Must be DM_STATE_UNMOUNTING. */
fsrp->fr_hdlcnt++;
sv_wait(&fsrp->fr_queue, 1, &fsrp->fr_lock, lc);
lc = mutex_spinlock(&fsrp->fr_lock);
fsrp->fr_hdlcnt--;
}
fsrp->fr_vfscnt++;
mutex_spinunlock(&fsrp->fr_lock, lc);
/* Now that the mutex is released, wait until we have access to the
vnode.
*/
if (fidp->fid_len == 0) { /* filesystem handle */
VFS_ROOT(fsrp->fr_vfsp, &vp, error);
} else { /* file object handle */
VFS_VGET(fsrp->fr_vfsp, &vp, fidp, error);
}
lc = mutex_spinlock(&fsrp->fr_lock);
fsrp->fr_vfscnt--;
if (fsrp->fr_unmount && fsrp->fr_vfscnt == 0)
sv_broadcast(&fsrp->fr_queue);
mutex_spinunlock(&fsrp->fr_lock, lc);
if (error || vp == NULL)
return(NULL);
if (fidp->fid_len == 0) {
type = DM_TDT_VFS;
} else if (vp->v_type == VREG) {
type = DM_TDT_REG;
} else if (vp->v_type == VDIR) {
type = DM_TDT_DIR;
} else if (vp->v_type == VLNK) {
type = DM_TDT_LNK;
} else {
type = DM_TDT_OTH;
}
*typep = type;
return(vp);
}
int
dm_vp_to_handle(
vnode_t *vp,
xfs_handle_t *handlep)
{
int error;
struct fid fid;
int hsize;
if (vp->v_vfsp->vfs_altfsid == NULL)
return(EINVAL);
VOP_FID2(vp, &fid, error);
if (error)
return(error);
memcpy(&handlep->ha_fsid, vp->v_vfsp->vfs_altfsid, sizeof(fsid_t));
memcpy(&handlep->ha_fid, &fid, fid.fid_len + sizeof fid.fid_len);
hsize = XFS_HSIZE(*handlep);
memset((char *)handlep + hsize, 0, sizeof(*handlep) - hsize);
return(0);
}
/* Given a vnode, check if that vnode resides in filesystem that supports
DMAPI. Returns zero if the vnode is in a DMAPI filesystem, otherwise
returns an errno.
*/
int
dm_check_dmapi_vp(
vnode_t *vp)
{
xfs_handle_t handle;
/* REFERENCED */
dm_fsreg_t *fsrp;
int error;
unsigned long lc; /* lock cookie */
if ((error = dm_vp_to_handle(vp, &handle)) != 0)
return(error);
if ((fsrp = dm_find_fsreg_and_lock((fsid_t*)&handle.ha_fsid, &lc)) == NULL)
return(EBADF);
mutex_spinunlock(&fsrp->fr_lock, lc);
return(0);
}
/* Return a pointer to the DM_EVENT_MOUNT event while a mount is still in
progress. This is only called by dm_get_config and dm_get_config_events
which need to access the filesystem during a mount but which don't have
a session and token to use.
*/
dm_tokevent_t *
dm_find_mount_tevp_and_lock(
fsid_t *fsidp,
unsigned long *lcp) /* address of returned lock cookie */
{
dm_fsreg_t *fsrp;
if ((fsrp = dm_find_fsreg_and_lock(fsidp, lcp)) == NULL)
return(NULL);
if (!fsrp->fr_tevp || fsrp->fr_state != DM_STATE_MOUNTING) {
mutex_spinunlock(&fsrp->fr_lock, *lcp);
return(NULL);
}
nested_spinlock(&fsrp->fr_tevp->te_lock);
nested_spinunlock(&fsrp->fr_lock);
return(fsrp->fr_tevp);
}
/* Wait interruptibly until a session registers disposition for 'event' in
filesystem 'vfsp'. Upon successful exit, both the filesystem's dm_fsreg_t
structure and the session's dm_session_t structure are locked. The caller
is responsible for unlocking both structures using the returned cookies.
Warning: The locks can be dropped in any order, but the 'lc2p' cookie MUST
BE USED FOR THE FIRST UNLOCK, and the lc1p cookie must be used for the
second unlock. If this is not done, the CPU will be interruptible while
holding a mutex, which could deadlock the machine!
*/
static int
dm_waitfor_disp(
vfs_t *vfsp,
dm_tokevent_t *tevp,
dm_fsreg_t **fsrpp,
unsigned long *lc1p, /* addr of first returned lock cookie */
dm_session_t **sessionpp,
unsigned long *lc2p) /* addr of 2nd returned lock cookie */
{
dm_eventtype_t event = tevp->te_msg.ev_type;
dm_session_t *s;
dm_fsreg_t *fsrp;
if ((fsrp = dm_find_fsreg_and_lock(vfsp->vfs_altfsid, lc1p)) == NULL)
return(ENOENT);
/* If no session is registered for this event in the specified
filesystem, then sleep interruptibly until one does.
*/
for (;;) {
int rc = 0;
/* The dm_find_session_and_lock() call is needed because a
session that is in the process of being removed might still
be in the dm_fsreg_t structure but won't be in the
dm_sessions list.
*/
if ((s = fsrp->fr_sessp[event]) != NULL &&
dm_find_session_and_lock(s->sn_sessid, &s, lc2p) == 0) {
break;
}
/* Noone is currently registered. DM_EVENT_UNMOUNT events
don't wait for anyone to register because the unmount is
already past the point of no return.
*/
if (event == DM_EVENT_UNMOUNT) {
mutex_spinunlock(&fsrp->fr_lock, *lc1p);
return(ENOENT);
}
/* Wait until a session registers for disposition of this
event.
*/
fsrp->fr_dispcnt++;
dm_link_event(tevp, &fsrp->fr_evt_dispq);
sv_wait_sig(&fsrp->fr_dispq, 1, &fsrp->fr_lock, *lc1p);
rc = signal_pending(current);
*lc1p = mutex_spinlock(&fsrp->fr_lock);
fsrp->fr_dispcnt--;
dm_unlink_event(tevp, &fsrp->fr_evt_dispq);
if (rc) { /* if signal was received */
mutex_spinunlock(&fsrp->fr_lock, *lc1p);
return(EINTR);
}
}
*sessionpp = s;
*fsrpp = fsrp;
return(0);
}
/* Returns the session pointer for the session registered for an event
in the given vfsp. If successful, the session is locked upon return. The
caller is responsible for releasing the lock. If no session is currently
registered for the event, dm_waitfor_disp_session() will sleep interruptibly
until a registration occurs.
*/
int
dm_waitfor_disp_session(
vfs_t *vfsp,
dm_tokevent_t *tevp,
dm_session_t **sessionpp,
unsigned long *lcp)
{
dm_fsreg_t *fsrp;
unsigned long lc2;
int error;
if (tevp->te_msg.ev_type < 0 || tevp->te_msg.ev_type > DM_EVENT_MAX)
return(EIO);
error = dm_waitfor_disp(vfsp, tevp, &fsrp, lcp, sessionpp, &lc2);
if (!error)
mutex_spinunlock(&fsrp->fr_lock, lc2); /* rev. cookie order*/
return(error);
}
/* Find the session registered for the DM_EVENT_DESTROY event on the specified
filesystem, sleeping if necessary until registration occurs. Once found,
copy the session's return-on-destroy attribute name, if any, back to the
caller.
*/
int
dm_waitfor_destroy_attrname(
vfs_t *vfsp,
dm_attrname_t *attrnamep)
{
dm_tokevent_t *tevp;
dm_session_t *s;
dm_fsreg_t *fsrp;
int error;
unsigned long lc1; /* first lock cookie */
unsigned long lc2; /* second lock cookie */
void *msgp;
tevp = dm_evt_create_tevp(DM_EVENT_DESTROY, 1, (void**)&msgp);
error = dm_waitfor_disp(vfsp, tevp, &fsrp, &lc1, &s, &lc2);
if (!error) {
*attrnamep = fsrp->fr_rattr; /* attribute or zeros */
mutex_spinunlock(&s->sn_qlock, lc2); /* rev. cookie order */
mutex_spinunlock(&fsrp->fr_lock, lc1);
}
dm_evt_rele_tevp(tevp,0);
return(error);
}
/* Unregisters the session for the disposition of all events on all
filesystems. This routine is not called until the session has been
dequeued from the session list and its session lock has been dropped,
but before the actual structure is freed, so it is safe to grab the
'dm_reg_lock' here. If dm_waitfor_disp_session() happens to be called
by another thread, it won't find this session on the session list and
will wait until a new session registers.
*/
void
dm_clear_fsreg(
dm_session_t *s)
{
dm_fsreg_t *fsrp;
int event;
unsigned long lc; /* lock cookie */
lc = mutex_spinlock(&dm_reg_lock);
for (fsrp = dm_registers; fsrp != NULL; fsrp = fsrp->fr_next) {
nested_spinlock(&fsrp->fr_lock);
for (event = 0; event < DM_EVENT_MAX; event++) {
if (fsrp->fr_sessp[event] != s)
continue;
fsrp->fr_sessp[event] = NULL;
if (event == DM_EVENT_DESTROY)
memset(&fsrp->fr_rattr, 0, sizeof(fsrp->fr_rattr));
}
nested_spinunlock(&fsrp->fr_lock);
}
mutex_spinunlock(&dm_reg_lock, lc);
}
/*
* Return the handle for the object named by path.
*/
int
dm_path_to_hdl(
char *path, /* any path name */
void *hanp, /* user's data buffer */
size_t *hlenp) /* set to size of data copied */
{
/* REFERENCED */
dm_fsreg_t *fsrp;
xfs_handle_t handle;
vnode_t *vp;
size_t hlen;
int error;
unsigned long lc; /* lock cookie */
struct nameidata nd;
struct inode *inode;
size_t len;
char *name;
/* XXX get things straightened out so getname() works here? */
len = strnlen_user(path, 2000);
name = kmalloc(len, GFP_KERNEL);
if (name == NULL) {
printk("%s/%d: kmalloc returned NULL\n", __FUNCTION__, __LINE__);
return(ENOMEM);
}
if (copy_from_user(name, path, len)) {
kfree(name);
return(EFAULT);
}
error = 0;
if (path_init(name, LOOKUP_POSITIVE, &nd))
error = path_walk(name, &nd);
kfree(name);
if (error)
return error;
ASSERT(nd.dentry);
ASSERT(nd.dentry->d_inode);
inode = igrab(nd.dentry->d_inode);
path_release(&nd);
if (inode->i_sb->s_magic != XFS_SB_MAGIC) {
/* we're not in XFS anymore, Toto */
iput(inode);
return EINVAL;
}
/* we need the vnode */
vp = LINVFS_GET_VP(inode);
error = dm_vp_to_handle(vp, &handle);
iput(inode);
if (error)
return(error);
if ((fsrp = dm_find_fsreg_and_lock((fsid_t*)&handle.ha_fsid, &lc)) == NULL)
return(EBADF);
mutex_spinunlock(&fsrp->fr_lock, lc);
hlen = XFS_HSIZE(handle);
if (copy_to_user(hanp, &handle, (int)hlen))
return(EFAULT);
return(put_user(hlen,hlenp));
}
/*
* Return the handle for the file system containing the object named by path.
*/
int
dm_path_to_fshdl(
char *path, /* any path name */
void *hanp, /* user's data buffer */
size_t *hlenp) /* set to size of data copied */
{
/* REFERENCED */
dm_fsreg_t *fsrp;
xfs_handle_t handle;
vnode_t *vp;
size_t hlen;
int error;
unsigned long lc; /* lock cookie */
struct nameidata nd;
struct inode *inode;
size_t len;
char *name;
/* XXX get things straightened out so getname() works here? */
len = strnlen_user(path, 2000);
name = kmalloc(len, GFP_KERNEL);
if (name == NULL) {
printk("%s/%d: kmalloc returned NULL\n", __FUNCTION__, __LINE__);
return(ENOMEM);
}
if (copy_from_user(name, path, len)) {
kfree(name);
return(EFAULT);
}
error = 0;
if (path_init(name, LOOKUP_POSITIVE|LOOKUP_FOLLOW, &nd))
error = path_walk(name, &nd);
kfree(name);
if (error)
return error;
ASSERT(nd.dentry);
ASSERT(nd.dentry->d_inode);
inode = igrab(nd.dentry->d_inode);
path_release(&nd);
if (inode->i_sb->s_magic != XFS_SB_MAGIC) {
/* we're not in XFS anymore, Toto */
iput(inode);
return EINVAL;
}
/* we need the vnode */
vp = LINVFS_GET_VP(inode);
error = dm_vp_to_handle(vp, &handle);
iput(inode);
if (error)
return(error);
if ((fsrp = dm_find_fsreg_and_lock((fsid_t*)&handle.ha_fsid, &lc)) == NULL)
return(EBADF);
mutex_spinunlock(&fsrp->fr_lock, lc);
hlen = FSHSIZE;
if(copy_to_user(hanp, &handle, (int)hlen))
return(EFAULT);
return(put_user(hlen,hlenp));
}
int
dm_fd_to_hdl(
int fd, /* any file descriptor */
void *hanp, /* user's data buffer */
size_t *hlenp) /* set to size of data copied */
{
/* REFERENCED */
dm_fsreg_t *fsrp;
xfs_handle_t handle;
size_t hlen;
int error;
unsigned long lc; /* lock cookie */
struct file *filep = fget(fd);
if (!filep)
return(EBADF);
if ((error = dm_vp_to_handle(LINVFS_GET_VP(filep->f_dentry->d_inode), &handle)) != 0)
return(error);
if ((fsrp = dm_find_fsreg_and_lock((fsid_t*)&handle.ha_fsid, &lc)) == NULL)
return(EBADF);
mutex_spinunlock(&fsrp->fr_lock, lc);
hlen = XFS_HSIZE(handle);
if (copy_to_user(hanp, &handle, (int)hlen))
return(EFAULT);
fput(filep);
return(put_user(hlen, hlenp));
}
/* Enable events on an object. */
int
dm_set_eventlist(
dm_sessid_t sid,
void *hanp,
size_t hlen,
dm_token_t token,
dm_eventset_t *eventsetp,
u_int maxevent)
{
dm_fsys_vector_t *fsys_vector;
dm_eventset_t eventset;
dm_tokdata_t *tdp;
int error;
if (copy_from_user(&eventset, eventsetp, sizeof(eventset)))
return(EFAULT);
/* Do some minor sanity checking. */
if (maxevent == 0 || maxevent > DM_EVENT_MAX)
return(EINVAL);
/* Access the specified object. */
error = dm_app_get_tdp(sid, hanp, hlen, token, DM_TDT_ANY,
DM_RIGHT_EXCL, &tdp);
if (error != 0)
return(error);
VN_BHV_READ_LOCK(VN_BHV_HEAD(tdp->td_vp));
fsys_vector = dm_fsys_vector(tdp->td_vp);
error = fsys_vector->set_eventlist(tdp->td_vp, tdp->td_right,
(tdp->td_type == DM_TDT_VFS ? DM_FSYS_OBJ : 0),
&eventset, maxevent);
VN_BHV_READ_UNLOCK(VN_BHV_HEAD(tdp->td_vp));
dm_app_put_tdp(tdp);
return(error);
}
/* Return the list of enabled events for an object. */
int
dm_get_eventlist(
dm_sessid_t sid,
void *hanp,
size_t hlen,
dm_token_t token,
u_int nelem,
dm_eventset_t *eventsetp,
u_int *nelemp)
{
dm_fsys_vector_t *fsys_vector;
dm_tokdata_t *tdp;
dm_eventset_t eventset;
u_int elem;
int error;
if (nelem == 0)
return(EINVAL);
/* Access the specified object. */
error = dm_app_get_tdp(sid, hanp, hlen, token, DM_TDT_ANY,
DM_RIGHT_SHARED, &tdp);
if (error != 0)
return(error);
/* Get the object's event list. */
VN_BHV_READ_LOCK(VN_BHV_HEAD(tdp->td_vp));
fsys_vector = dm_fsys_vector(tdp->td_vp);
error = fsys_vector->get_eventlist(tdp->td_vp, tdp->td_right,
(tdp->td_type == DM_TDT_VFS ? DM_FSYS_OBJ : 0),
nelem, &eventset, &elem);
VN_BHV_READ_UNLOCK(VN_BHV_HEAD(tdp->td_vp));
dm_app_put_tdp(tdp);
if (error)
return(error);
if (copy_to_user(eventsetp, &eventset, sizeof(eventset)))
return(EFAULT);
if (put_user(nelem, nelemp))
return(EFAULT);
return(0);
}
/* Register for disposition of events. The handle must either be the
global handle or must be the handle of a file system. The list of events
is pointed to by eventsetp.
*/
int
dm_set_disp(
dm_sessid_t sid,
void *hanp,
size_t hlen,
dm_token_t token,
dm_eventset_t *eventsetp,
u_int maxevent)
{
dm_session_t *s;
dm_fsreg_t *fsrp;
dm_tokdata_t *tdp;
dm_eventset_t eventset;
int error;
unsigned long lc1; /* first lock cookie */
unsigned long lc2; /* second lock cookie */
u_int i;
/* Copy in and validate the event mask. Only the lower maxevent bits
are meaningful, so clear any bits set above maxevent.
*/
if (maxevent == 0 || maxevent > DM_EVENT_MAX)
return(EINVAL);
if (copy_from_user(&eventset, eventsetp, sizeof(eventset)))
return(EFAULT);
eventset &= (1 << maxevent) - 1;
/* If the caller specified the global handle, then the only valid token
is DM_NO_TOKEN, and the only valid event in the event mask is
DM_EVENT_MOUNT. If it is set, add the session to the list of
sessions that want to receive mount events. If it is clear, remove
the session from the list. Since DM_EVENT_MOUNT events never block
waiting for a session to register, there is noone to wake up if we
do add the session to the list.
*/
if (DM_GLOBALHAN(hanp, hlen)) {
if (token != DM_NO_TOKEN)
return(EINVAL);
if ((error = dm_find_session_and_lock(sid, &s, &lc1)) != 0)
return(error);
if (eventset == 0) {
s->sn_flags &= ~DM_SN_WANTMOUNT;
error = 0;
} else if (eventset == 1 << DM_EVENT_MOUNT) {
s->sn_flags |= DM_SN_WANTMOUNT;
error = 0;
} else {
error = EINVAL;
}
mutex_spinunlock(&s->sn_qlock, lc1);
return(error);
}
/* Since it's not the global handle, it had better be a filesystem
handle. Verify that the first 'maxevent' events in the event list
are all valid for a filesystem handle.
*/
if (eventset & ~DM_VALID_DISP_EVENTS)
return(EINVAL);
/* Verify that the session is valid, that the handle is a filesystem
handle, and that the filesystem is capable of sending events. (If
a dm_fsreg_t structure exists, then the filesystem can issue events.)
*/
error = dm_app_get_tdp(sid, hanp, hlen, token, DM_TDT_VFS,
DM_RIGHT_EXCL, &tdp);
if (error != 0)
return(error);
fsrp = dm_find_fsreg_and_lock((fsid_t*)&tdp->td_handle.ha_fsid, &lc1);
if (fsrp == NULL) {
dm_app_put_tdp(tdp);
return(EINVAL);
}
/* Now that we own 'fsrp->fr_lock', get the lock on the session so that
it can't disappear while we add it to the filesystem's event mask.
*/
if ((error = dm_find_session_and_lock(sid, &s, &lc2)) != 0) {
mutex_spinunlock(&fsrp->fr_lock, lc1);
dm_app_put_tdp(tdp);
return(error);
}
/* Update the event disposition array for this filesystem, adding
and/or removing the session as appropriate. If this session is
dropping registration for DM_EVENT_DESTROY, or is overriding some
other session's registration for DM_EVENT_DESTROY, then clear any
any attr-on-destroy attribute name also.
*/
for (i = 0; i < DM_EVENT_MAX; i++) {
if (DMEV_ISSET(i, eventset)) {
if (i == DM_EVENT_DESTROY && fsrp->fr_sessp[i] != s)
memset(&fsrp->fr_rattr, 0, sizeof(fsrp->fr_rattr));
fsrp->fr_sessp[i] = s;
} else if (fsrp->fr_sessp[i] == s) {
if (i == DM_EVENT_DESTROY)
memset(&fsrp->fr_rattr, 0, sizeof(fsrp->fr_rattr));
fsrp->fr_sessp[i] = NULL;
}
}
mutex_spinunlock(&s->sn_qlock, lc2); /* reverse cookie order */
/* Wake up all processes waiting for a disposition on this filesystem
in case any of them happen to be waiting for an event which we just
added.
*/
if (fsrp->fr_dispcnt)
sv_broadcast(&fsrp->fr_dispq);
mutex_spinunlock(&fsrp->fr_lock, lc1);
dm_app_put_tdp(tdp);
return(0);
}
/*
* Register a specific attribute name with a filesystem. The value of
* the attribute is to be returned with an asynchronous destroy event.
*/
int
dm_set_return_on_destroy(
dm_sessid_t sid,
void *hanp,
size_t hlen,
dm_token_t token,
dm_attrname_t *attrnamep,
dm_boolean_t enable)
{
dm_attrname_t attrname;
dm_tokdata_t *tdp;
dm_fsreg_t *fsrp;
dm_session_t *s;
int error;
unsigned long lc1; /* first lock cookie */
unsigned long lc2; /* second lock cookie */
/* If a dm_attrname_t is provided, copy it in and validate it. */
if (enable && (error = copy_from_user(&attrname, attrnamep, sizeof(attrname))) != 0)
return(error);
/* Validate the filesystem handle and use it to get the filesystem's
disposition structure.
*/
error = dm_app_get_tdp(sid, hanp, hlen, token, DM_TDT_VFS,
DM_RIGHT_EXCL, &tdp);
if (error != 0)
return(error);
fsrp = dm_find_fsreg_and_lock((fsid_t*)&tdp->td_handle.ha_fsid, &lc1);
if (fsrp == NULL) {
dm_app_put_tdp(tdp);
return(EINVAL);
}
/* Now that we own 'fsrp->fr_lock', get the lock on the session so that
it can't disappear while we add it to the filesystem's event mask.
*/
if ((error = dm_find_session_and_lock(sid, &s, &lc2)) != 0) {
mutex_spinunlock(&fsrp->fr_lock, lc1);
dm_app_put_tdp(tdp);
return(error);
}
/* A caller cannot disable return-on-destroy if he is not registered
for DM_EVENT_DESTROY. Enabling return-on-destroy is an implicit
dm_set_disp() for DM_EVENT_DESTROY; we wake up all processes
waiting for a disposition in case any was waiting for a
DM_EVENT_DESTROY event.
*/
error = 0;
if (enable) {
fsrp->fr_sessp[DM_EVENT_DESTROY] = s;
fsrp->fr_rattr = attrname;
if (fsrp->fr_dispcnt)
sv_broadcast(&fsrp->fr_dispq);
} else if (fsrp->fr_sessp[DM_EVENT_DESTROY] != s) {
error = EINVAL;
} else {
memset(&fsrp->fr_rattr, 0, sizeof(fsrp->fr_rattr));
}
mutex_spinunlock(&s->sn_qlock, lc2); /* reverse cookie order */
mutex_spinunlock(&fsrp->fr_lock, lc1);
dm_app_put_tdp(tdp);
return(error);
}
int
dm_get_mountinfo(
dm_sessid_t sid,
void *hanp,
size_t hlen,
dm_token_t token,
size_t buflen,
void *bufp,
size_t *rlenp)
{
dm_fsreg_t *fsrp;
dm_tokdata_t *tdp;
int error;
unsigned long lc; /* lock cookie */
/* Make sure that the caller's buffer is 8-byte aligned. */
if (((__psint_t)bufp & (sizeof(__u64) - 1)) != 0)
return(EFAULT);
/* Verify that the handle is a filesystem handle, and that the
filesystem is capable of sending events. If not, return an error.
*/
error = dm_app_get_tdp(sid, hanp, hlen, token, DM_TDT_VFS,
DM_RIGHT_SHARED, &tdp);
if (error != 0)
return(error);
/* Find the filesystem entry. This should always succeed as the
dm_app_get_tdp call created a filesystem reference. Once we find
the entry, drop the lock. The mountinfo message is never modified,
the filesystem entry can't disappear, and we don't want to hold a
spinlock while doing copyout calls.
*/
fsrp = dm_find_fsreg_and_lock((fsid_t*)&tdp->td_handle.ha_fsid, &lc);
if (fsrp == NULL) {
dm_app_put_tdp(tdp);
return(EINVAL);
}
mutex_spinunlock(&fsrp->fr_lock, lc);
/* Copy the message into the user's buffer and update his 'rlenp'. */
if (put_user(fsrp->fr_msgsize, rlenp)) {
error = EFAULT;
} else if (fsrp->fr_msgsize > buflen) { /* user buffer not big enough */
error = E2BIG;
} else if (copy_to_user(bufp, fsrp->fr_msg, fsrp->fr_msgsize)) {
error = EFAULT;
} else {
error = 0;
}
dm_app_put_tdp(tdp);
return(error);
}
int
dm_getall_disp(
dm_sessid_t sid,
size_t buflen,
void *bufp,
size_t *rlenp)
{
dm_session_t *s; /* pointer to session given by sid */
unsigned long lc1; /* first lock cookie */
unsigned long lc2; /* second lock cookie */
int totalsize;
int msgsize;
int fsyscnt;
dm_dispinfo_t *prevmsg;
dm_fsreg_t *fsrp;
int error;
char *kbuf;
int tmp3;
int tmp4;
/* Because the dm_getall_disp structure contains a __u64 field,
make sure that the buffer provided by the caller is aligned so
that he can read such fields successfully.
*/
if (((__psint_t)bufp & (sizeof(__u64) - 1)) != 0)
return(EFAULT);
/* Compute the size of a dm_dispinfo structure, rounding up to an
8-byte boundary so that any subsequent structures will also be
aligned.
*/
#if 0
/* XXX ug, what is going on here? */
msgsize = (sizeof(dm_dispinfo_t) + FSHSIZE + sizeof(uint64_t) - 1) &
~(sizeof(uint64_t) - 1);
#else
tmp3 = sizeof(dm_dispinfo_t) + FSHSIZE;
tmp3 += sizeof(__u64);
tmp3 -= 1;
tmp4 = ~(sizeof(__u64) - 1);
msgsize = tmp3 & tmp4;
#endif
/* Loop until we can get the right amount of temp space, being careful
not to hold a mutex during the allocation. Usually only one trip.
*/
for (;;) {
if ((fsyscnt = dm_fsys_cnt) == 0) {
/*if (dm_cpoutsizet(rlenp, 0))*/
if (put_user(0,rlenp))
return(EFAULT);
return(0);
}
kbuf = kmalloc(fsyscnt * msgsize, GFP_KERNEL);
if (kbuf == NULL) {
printk("%s/%d: kmalloc returned NULL\n", __FUNCTION__, __LINE__);
return ENOMEM;
}
lc1 = mutex_spinlock(&dm_reg_lock);
if (fsyscnt == dm_fsys_cnt)
break;
mutex_spinunlock(&dm_reg_lock, lc1);
kfree(kbuf);
}
/* Find the indicated session and lock it. */
if ((error = dm_find_session_and_lock(sid, &s, &lc2)) != 0) {
mutex_spinunlock(&dm_reg_lock, lc1);
kfree(kbuf);
return(error);
}
/* Create a dm_dispinfo structure for each filesystem in which
this session has at least one event selected for disposition.
*/
totalsize = 0; /* total bytes to transfer to the user */
prevmsg = NULL;
for (fsrp = dm_registers; fsrp; fsrp = fsrp->fr_next) {
dm_dispinfo_t *disp;
int event;
int found;
disp = (dm_dispinfo_t *)(kbuf + totalsize);
DMEV_ZERO(disp->di_eventset);
for (event = 0, found = 0; event < DM_EVENT_MAX; event++) {
if (fsrp->fr_sessp[event] != s)
continue;
DMEV_SET(event, disp->di_eventset);
found++;
}
if (!found)
continue;
disp->_link = 0;
disp->di_fshandle.vd_offset = sizeof(dm_dispinfo_t);
disp->di_fshandle.vd_length = FSHSIZE;
memcpy((char *)disp + disp->di_fshandle.vd_offset,
&fsrp->fr_fsid, disp->di_fshandle.vd_length);
if (prevmsg)
prevmsg->_link = msgsize;
prevmsg = disp;
totalsize += msgsize;
}
mutex_spinunlock(&s->sn_qlock, lc2); /* reverse cookie order */
mutex_spinunlock(&dm_reg_lock, lc1);
if (put_user(totalsize, rlenp)) {
error = EFAULT;
} else if (totalsize > buflen) { /* no more room */
error = E2BIG;
} else if (totalsize && copy_to_user(bufp, kbuf, totalsize)) {
error = EFAULT;
} else {
error = 0;
}
kfree(kbuf);
return(error);
}
int
dm_open_by_handle_rvp(
unsigned int fd,
void *hanp,
size_t hlen,
int flags,
int *rvp)
{
xfs_handle_t handle;
int error;
vnode_t *vp;
short td_type;
struct dentry *dentry;
struct inode *inodep;
int new_fd;
struct file *mfilp;
struct file *filp;
struct list_head *lp;
if ((error = dm_copyin_handle(hanp, hlen, &handle)) != 0) {
return(error);
}
if ((vp = dm_handle_to_vp(&handle, &td_type)) == NULL) {
return(EBADF);
}
inodep = LINVFS_GET_IP(vp);
if ((td_type == DM_TDT_VFS) || (td_type == DM_TDT_OTH)) {
iput(inodep);
return(EBADF);
}
if ((new_fd = get_unused_fd()) < 0) {
iput(inodep);
return(EMFILE);
}
/* Now to find a dentry. If possible, get a well-connected one. */
spin_lock(&dcache_lock);
for (lp = inodep->i_dentry.next; lp != &inodep->i_dentry ; lp=lp->next) {
dentry = list_entry(lp,struct dentry, d_alias);
if (! (dentry->d_flags & DCACHE_NFSD_DISCONNECTED)) {
dget_locked(dentry);
dentry->d_vfs_flags |= DCACHE_REFERENCED;
spin_unlock(&dcache_lock);
iput(inodep);
goto found;
}
}
spin_unlock(&dcache_lock);
/* ELSE didn't find dentry. Create anonymous dcache entry. */
dentry = d_alloc_root(inodep);
if (dentry == NULL) {
iput(inodep);
put_unused_fd(new_fd);
return(ENOMEM);
}
/* keep nfsd happy. */
dentry->d_flags |= DCACHE_NFSD_DISCONNECTED;
found:
if( inodep->i_ino != dentry->d_inode->i_ino ){
dput(dentry);
put_unused_fd(new_fd);
return(EINVAL);
}
mfilp = fget(fd);
if (!mfilp) {
dput(dentry);
put_unused_fd(new_fd);
return(EBADF);
}
mntget(mfilp->f_vfsmnt);
/* Create file pointer */
filp = dentry_open(dentry, mfilp->f_vfsmnt, flags);
if (IS_ERR(filp)) {
put_unused_fd(new_fd);
fput(mfilp);
return -PTR_ERR(filp);
}
if (td_type == DM_TDT_REG)
filp->f_mode |= FINVIS;
fd_install(new_fd, filp);
fput(mfilp);
*rvp = new_fd;
return 0;
}
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