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authorDavide Italiano <davide@FreeBSD.org>2013-05-04 14:03:18 +0000
committerDavide Italiano <davide@FreeBSD.org>2013-05-04 14:03:18 +0000
commit92a4d9bcc8361aabe232a0d731002564c6809bbd (patch)
tree58f50a43b89521ebbbf95593be5439c98bbdde90
parentb48b774f99f8984c3e2bd9bb8a01dee0c5aa2058 (diff)
downloadsrc-92a4d9bcc8361aabe232a0d731002564c6809bbd.tar.gz
src-92a4d9bcc8361aabe232a0d731002564c6809bbd.zip
Completely rewrite the interface to smbdev switching from dev_clone
to cdevpriv(9). This commit changes the semantic of mount_smbfs in userland as well, which now passes file descriptor in order to to mount a specific filesystem istance. Reviewed by: attilio, ed Tested by: martymac
Notes
Notes: svn path=/head/; revision=250236
-rw-r--r--contrib/smbfs/lib/smb/ctx.c30
-rw-r--r--contrib/smbfs/mount_smbfs/mount_smbfs.c8
-rw-r--r--sys/fs/smbfs/smbfs.h1
-rw-r--r--sys/fs/smbfs/smbfs_vfsops.c39
-rw-r--r--sys/netsmb/smb_dev.c221
-rw-r--r--sys/netsmb/smb_dev.h20
6 files changed, 142 insertions, 177 deletions
diff --git a/contrib/smbfs/lib/smb/ctx.c b/contrib/smbfs/lib/smb/ctx.c
index 0709b6b9a9b5..c7b3ecaba663 100644
--- a/contrib/smbfs/lib/smb/ctx.c
+++ b/contrib/smbfs/lib/smb/ctx.c
@@ -602,40 +602,12 @@ smb_ctx_gethandle(struct smb_ctx *ctx)
int fd, i;
char buf[20];
- /*
- * First, try to open as cloned device
- */
fd = open("/dev/"NSMB_NAME, O_RDWR);
if (fd >= 0) {
ctx->ct_fd = fd;
return 0;
}
- /*
- * well, no clone capabilities available - we have to scan
- * all devices in order to get free one
- */
- for (i = 0; i < 1024; i++) {
- snprintf(buf, sizeof(buf), "/dev/%s%d", NSMB_NAME, i);
- fd = open(buf, O_RDWR);
- if (fd >= 0) {
- ctx->ct_fd = fd;
- return 0;
- }
- }
- /*
- * This is a compatibility with old /dev/net/nsmb device
- */
- for (i = 0; i < 1024; i++) {
- snprintf(buf, sizeof(buf), "/dev/net/%s%d", NSMB_NAME, i);
- fd = open(buf, O_RDWR);
- if (fd >= 0) {
- ctx->ct_fd = fd;
- return 0;
- }
- if (errno == ENOENT)
- return ENOENT;
- }
- return ENOENT;
+ return ENOENT;
}
int
diff --git a/contrib/smbfs/mount_smbfs/mount_smbfs.c b/contrib/smbfs/mount_smbfs/mount_smbfs.c
index 3025c797612b..8f159ce68e00 100644
--- a/contrib/smbfs/mount_smbfs/mount_smbfs.c
+++ b/contrib/smbfs/mount_smbfs/mount_smbfs.c
@@ -82,7 +82,7 @@ main(int argc, char *argv[])
struct xvfsconf vfc;
#endif
char *next;
- int opt, error, mntflags, caseopt, dev;
+ int opt, error, mntflags, caseopt, fd;
uid_t uid;
gid_t gid;
mode_t dir_mode, file_mode;
@@ -90,7 +90,7 @@ main(int argc, char *argv[])
iov = NULL;
iovlen = 0;
- dev = 0;
+ fd = 0;
uid = (uid_t)-1;
gid = (gid_t)-1;
caseopt = 0;
@@ -266,11 +266,11 @@ main(int argc, char *argv[])
exit(1);
}
- dev = ctx->ct_fd;
+ fd = ctx->ct_fd;
build_iovec(&iov, &iovlen, "fstype", strdup("smbfs"), -1);
build_iovec(&iov, &iovlen, "fspath", mount_point, -1);
- build_iovec_argf(&iov, &iovlen, "dev", "%d", dev);
+ build_iovec_argf(&iov, &iovlen, "fd", "%d", fd);
build_iovec(&iov, &iovlen, "mountpoint", mount_point, -1);
build_iovec_argf(&iov, &iovlen, "uid", "%d", uid);
build_iovec_argf(&iov, &iovlen, "gid", "%d", gid);
diff --git a/sys/fs/smbfs/smbfs.h b/sys/fs/smbfs/smbfs.h
index 2ebdf8b616e7..925a8f29ea2a 100644
--- a/sys/fs/smbfs/smbfs.h
+++ b/sys/fs/smbfs/smbfs.h
@@ -75,6 +75,7 @@ struct smbmount {
mode_t sm_dir_mode;
struct mount * sm_mp;
struct smbnode * sm_root;
+ struct smb_dev * sm_dev;
struct ucred * sm_owner;
uint64_t sm_flags;
long sm_nextino;
diff --git a/sys/fs/smbfs/smbfs_vfsops.c b/sys/fs/smbfs/smbfs_vfsops.c
index 8b9237669bad..938b7ff8c479 100644
--- a/sys/fs/smbfs/smbfs_vfsops.c
+++ b/sys/fs/smbfs/smbfs_vfsops.c
@@ -122,7 +122,7 @@ smbfs_cmount(struct mntarg *ma, void * data, uint64_t flags)
}
static const char *smbfs_opts[] = {
- "dev", "soft", "intr", "strong", "have_nls", "long",
+ "fd", "soft", "intr", "strong", "have_nls", "long",
"mountpoint", "rootpath", "uid", "gid", "file_mode", "dir_mode",
"caseopt", "errmsg", NULL
};
@@ -135,10 +135,12 @@ smbfs_mount(struct mount *mp)
struct smb_share *ssp = NULL;
struct vnode *vp;
struct thread *td;
+ struct smb_dev *dev;
struct smb_cred *scred;
int error, v;
char *pc, *pe;
+ dev = NULL;
td = curthread;
if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS))
return EOPNOTSUPP;
@@ -150,26 +152,29 @@ smbfs_mount(struct mount *mp)
scred = smbfs_malloc_scred();
smb_makescred(scred, td, td->td_ucred);
- if (1 != vfs_scanopt(mp->mnt_optnew, "dev", "%d", &v)) {
- vfs_mount_error(mp, "No dev option");
+
+ /* Ask userspace of `fd`, the file descriptor of this session */
+ if (1 != vfs_scanopt(mp->mnt_optnew, "fd", "%d", &v)) {
+ vfs_mount_error(mp, "No fd option");
smbfs_free_scred(scred);
return (EINVAL);
}
- error = smb_dev2share(v, SMBM_EXEC, scred, &ssp);
+ error = smb_dev2share(v, SMBM_EXEC, scred, &ssp, &dev);
+ smp = malloc(sizeof(*smp), M_SMBFSDATA, M_WAITOK | M_ZERO);
if (error) {
printf("invalid device handle %d (%d)\n", v, error);
- vfs_mount_error(mp, "invalid device handle %d (%d)\n", v, error);
+ vfs_mount_error(mp, "invalid device handle %d %d\n", v, error);
smbfs_free_scred(scred);
+ free(smp, M_SMBFSDATA);
return error;
}
vcp = SSTOVC(ssp);
smb_share_unlock(ssp, 0);
mp->mnt_stat.f_iosize = SSTOVC(ssp)->vc_txmax;
-
- smp = malloc(sizeof(*smp), M_SMBFSDATA, M_WAITOK | M_ZERO);
- mp->mnt_data = smp;
+ mp->mnt_data = smp;
smp->sm_share = ssp;
smp->sm_root = NULL;
+ smp->sm_dev = dev;
if (1 != vfs_scanopt(mp->mnt_optnew,
"caseopt", "%d", &smp->sm_caseopt)) {
vfs_mount_error(mp, "Invalid caseopt");
@@ -238,8 +243,15 @@ smbfs_mount(struct mount *mp)
bad:
if (ssp)
smb_share_put(ssp, scred);
- smbfs_free_scred(scred);
- return error;
+ smbfs_free_scred(scred);
+ SMB_LOCK();
+ if (error && smp->sm_dev == dev) {
+ smp->sm_dev = NULL;
+ sdp_trydestroy(dev);
+ }
+ SMB_UNLOCK();
+ free(smp, M_SMBFSDATA);
+ return error;
}
/* Unmount the filesystem described by mp. */
@@ -249,6 +261,7 @@ smbfs_unmount(struct mount *mp, int mntflags)
struct thread *td;
struct smbmount *smp = VFSTOSMBFS(mp);
struct smb_cred *scred;
+ struct smb_dev *dev;
int error, flags;
SMBVDEBUG("smbfs_unmount: flags=%04x\n", mntflags);
@@ -277,7 +290,13 @@ smbfs_unmount(struct mount *mp, int mntflags)
if (error)
goto out;
smb_share_put(smp->sm_share, scred);
+ SMB_LOCK();
+ dev = smp->sm_dev;
+ if (!dev)
+ panic("No private data for mount point");
+ sdp_trydestroy(dev);
mp->mnt_data = NULL;
+ SMB_UNLOCK();
free(smp, M_SMBFSDATA);
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_LOCAL;
diff --git a/sys/netsmb/smb_dev.c b/sys/netsmb/smb_dev.c
index 5315f3f7a891..681397af6e76 100644
--- a/sys/netsmb/smb_dev.c
+++ b/sys/netsmb/smb_dev.c
@@ -29,6 +29,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
+#include <sys/capability.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <sys/conf.h>
@@ -55,20 +56,16 @@ __FBSDID("$FreeBSD$");
#include <netsmb/smb_subr.h>
#include <netsmb/smb_dev.h>
-#define SMB_GETDEV(dev) ((struct smb_dev*)(dev)->si_drv1)
-#define SMB_CHECKMINOR(dev) do { \
- sdp = SMB_GETDEV(dev); \
- if (sdp == NULL) return ENXIO; \
- } while(0)
+static struct cdev *nsmb_dev;
static d_open_t nsmb_dev_open;
-static d_close_t nsmb_dev_close;
static d_ioctl_t nsmb_dev_ioctl;
MODULE_DEPEND(netsmb, libiconv, 1, 1, 2);
MODULE_VERSION(netsmb, NSMB_VERSION);
static int smb_version = NSMB_VERSION;
+struct sx smb_lock;
SYSCTL_DECL(_net_smb);
@@ -76,110 +73,97 @@ SYSCTL_INT(_net_smb, OID_AUTO, version, CTLFLAG_RD, &smb_version, 0, "");
static MALLOC_DEFINE(M_NSMBDEV, "NETSMBDEV", "NET/SMB device");
-
-/*
-int smb_dev_queue(struct smb_dev *ndp, struct smb_rq *rqp, int prio);
-*/
-
static struct cdevsw nsmb_cdevsw = {
.d_version = D_VERSION,
- .d_flags = D_NEEDGIANT | D_NEEDMINOR,
.d_open = nsmb_dev_open,
- .d_close = nsmb_dev_close,
.d_ioctl = nsmb_dev_ioctl,
.d_name = NSMB_NAME
};
-static eventhandler_tag nsmb_dev_tag;
-static struct clonedevs *nsmb_clones;
-
-static void
-nsmb_dev_clone(void *arg, struct ucred *cred, char *name, int namelen,
- struct cdev **dev)
+static int
+nsmb_dev_init(void)
{
- int i, u;
- if (*dev != NULL)
- return;
+ nsmb_dev = make_dev(&nsmb_cdevsw, 0, UID_ROOT, GID_OPERATOR,
+ 0600, "nsmb");
+ if (nsmb_dev == NULL)
+ return (ENOMEM);
+ return (0);
+}
- if (strcmp(name, NSMB_NAME) == 0)
- u = -1;
- else if (dev_stdclone(name, NULL, NSMB_NAME, &u) != 1)
- return;
- i = clone_create(&nsmb_clones, &nsmb_cdevsw, &u, dev, 0);
- if (i)
- *dev = make_dev_credf(MAKEDEV_REF, &nsmb_cdevsw, u, cred,
- UID_ROOT, GID_WHEEL, 0600, "%s%d", NSMB_NAME, u);
+static void
+nsmb_dev_destroy(void)
+{
+
+ MPASS(nsmb_dev != NULL);
+ destroy_dev(nsmb_dev);
+ nsmb_dev = NULL;
}
-static int
-nsmb_dev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
+static struct smb_dev *
+smbdev_alloc(struct cdev *dev)
{
struct smb_dev *sdp;
- struct ucred *cred = td->td_ucred;
- int s;
-
- sdp = SMB_GETDEV(dev);
- if (sdp && (sdp->sd_flags & NSMBFL_OPEN))
- return EBUSY;
- if (sdp == NULL) {
- sdp = malloc(sizeof(*sdp), M_NSMBDEV, M_WAITOK);
- dev->si_drv1 = (void*)sdp;
- }
- /*
- * XXX: this is just crazy - make a device for an already passed device...
- * someone should take care of it.
- */
- if ((dev->si_flags & SI_NAMED) == 0)
- make_dev(&nsmb_cdevsw, dev2unit(dev), cred->cr_uid,
- cred->cr_gid, 0700, NSMB_NAME"%d", dev2unit(dev));
- bzero(sdp, sizeof(*sdp));
-/*
- STAILQ_INIT(&sdp->sd_rqlist);
- STAILQ_INIT(&sdp->sd_rplist);
- bzero(&sdp->sd_pollinfo, sizeof(struct selinfo));
-*/
- s = splimp();
+
+ sdp = malloc(sizeof(struct smb_dev), M_NSMBDEV, M_WAITOK | M_ZERO);
+ sdp->dev = dev;
sdp->sd_level = -1;
sdp->sd_flags |= NSMBFL_OPEN;
- splx(s);
- return 0;
+ sdp->refcount = 1;
+ return (sdp);
+}
+
+void
+sdp_dtor(void *arg)
+{
+ struct smb_dev *dev;
+
+ dev = (struct smb_dev *)arg;
+ SMB_LOCK();
+ sdp_trydestroy(dev);
+ SMB_UNLOCK();
}
static int
-nsmb_dev_close(struct cdev *dev, int flag, int fmt, struct thread *td)
+nsmb_dev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct smb_dev *sdp;
+ int error;
+
+ sdp = smbdev_alloc(dev);
+ error = devfs_set_cdevpriv(sdp, sdp_dtor);
+ if (error) {
+ free(sdp, M_NSMBDEV);
+ return (error);
+ }
+ return (0);
+}
+
+void
+sdp_trydestroy(struct smb_dev *sdp)
+{
struct smb_vc *vcp;
struct smb_share *ssp;
struct smb_cred *scred;
- int s;
+ SMB_LOCKASSERT();
+ if (!sdp)
+ panic("No smb_dev upon device close");
+ MPASS(sdp->refcount > 0);
+ sdp->refcount--;
+ if (sdp->refcount)
+ return;
scred = malloc(sizeof(struct smb_cred), M_NSMBDEV, M_WAITOK);
- SMB_CHECKMINOR(dev);
- s = splimp();
- if ((sdp->sd_flags & NSMBFL_OPEN) == 0) {
- splx(s);
- free(scred, M_NSMBDEV);
- return EBADF;
- }
- smb_makescred(scred, td, NULL);
+ smb_makescred(scred, curthread, NULL);
ssp = sdp->sd_share;
if (ssp != NULL)
smb_share_rele(ssp, scred);
vcp = sdp->sd_vc;
if (vcp != NULL)
smb_vc_rele(vcp, scred);
-/*
- smb_flushq(&sdp->sd_rqlist);
- smb_flushq(&sdp->sd_rplist);
-*/
- dev->si_drv1 = NULL;
- free(sdp, M_NSMBDEV);
- destroy_dev_sched(dev);
- splx(s);
free(scred, M_NSMBDEV);
- return 0;
+ free(sdp, M_NSMBDEV);
+ return;
}
@@ -192,11 +176,11 @@ nsmb_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thre
struct smb_cred *scred;
int error = 0;
- SMB_CHECKMINOR(dev);
- if ((sdp->sd_flags & NSMBFL_OPEN) == 0)
- return EBADF;
-
+ error = devfs_get_cdevpriv((void **)&sdp);
+ if (error)
+ return (error);
scred = malloc(sizeof(struct smb_cred), M_NSMBDEV, M_WAITOK);
+ SMB_LOCK();
smb_makescred(scred, td, NULL);
switch (cmd) {
case SMBIOC_OPENSESSION:
@@ -345,6 +329,7 @@ nsmb_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thre
}
out:
free(scred, M_NSMBDEV);
+ SMB_UNLOCK();
return error;
}
@@ -363,18 +348,18 @@ nsmb_dev_load(module_t mod, int cmd, void *arg)
smb_sm_done();
break;
}
- clone_setup(&nsmb_clones);
- nsmb_dev_tag = EVENTHANDLER_REGISTER(dev_clone, nsmb_dev_clone, 0, 1000);
+ error = nsmb_dev_init();
+ if (error)
+ break;
+ sx_init(&smb_lock, "samba device lock");
break;
case MOD_UNLOAD:
smb_iod_done();
error = smb_sm_done();
if (error)
break;
- EVENTHANDLER_DEREGISTER(dev_clone, nsmb_dev_tag);
- drain_dev_clone_events();
- clone_cleanup(&nsmb_clones);
- destroy_dev_drain(&nsmb_cdevsw);
+ nsmb_dev_destroy();
+ sx_destroy(&smb_lock);
break;
default:
error = EINVAL;
@@ -385,58 +370,40 @@ nsmb_dev_load(module_t mod, int cmd, void *arg)
DEV_MODULE (dev_netsmb, nsmb_dev_load, 0);
-/*
- * Convert a file descriptor to appropriate smb_share pointer
- */
-static struct file*
-nsmb_getfp(struct filedesc* fdp, int fd, int flag)
-{
- struct file* fp;
-
- FILEDESC_SLOCK(fdp);
- if ((fp = fget_locked(fdp, fd)) == NULL || (fp->f_flag & flag) == 0) {
- FILEDESC_SUNLOCK(fdp);
- return (NULL);
- }
- fhold(fp);
- FILEDESC_SUNLOCK(fdp);
- return (fp);
-}
-
int
smb_dev2share(int fd, int mode, struct smb_cred *scred,
- struct smb_share **sspp)
+ struct smb_share **sspp, struct smb_dev **ssdp)
{
- struct file *fp;
- struct vnode *vp;
+ struct file *fp, *fptmp;
struct smb_dev *sdp;
struct smb_share *ssp;
- struct cdev *dev;
+ struct thread *td;
int error;
- fp = nsmb_getfp(scred->scr_td->td_proc->p_fd, fd, FREAD | FWRITE);
- if (fp == NULL)
- return EBADF;
- vp = fp->f_vnode;
- if (vp == NULL) {
- fdrop(fp, curthread);
- return EBADF;
- }
- if (vp->v_type != VCHR) {
- fdrop(fp, curthread);
- return EBADF;
- }
- dev = vp->v_rdev;
- SMB_CHECKMINOR(dev);
+ td = curthread;
+ error = fget(td, fd, CAP_READ, &fp);
+ if (error)
+ return (error);
+ fptmp = td->td_fpop;
+ td->td_fpop = fp;
+ error = devfs_get_cdevpriv((void **)&sdp);
+ td->td_fpop = fptmp;
+ fdrop(fp, td);
+ if (error || sdp == NULL)
+ return (error);
+ SMB_LOCK();
+ *ssdp = sdp;
ssp = sdp->sd_share;
if (ssp == NULL) {
- fdrop(fp, curthread);
- return ENOTCONN;
+ SMB_UNLOCK();
+ return (ENOTCONN);
}
error = smb_share_get(ssp, LK_EXCLUSIVE, scred);
- if (error == 0)
+ if (error == 0) {
+ sdp->refcount++;
*sspp = ssp;
- fdrop(fp, curthread);
+ }
+ SMB_UNLOCK();
return error;
}
diff --git a/sys/netsmb/smb_dev.h b/sys/netsmb/smb_dev.h
index 67149e1b6cec..25d08b93f287 100644
--- a/sys/netsmb/smb_dev.h
+++ b/sys/netsmb/smb_dev.h
@@ -155,22 +155,28 @@ struct smbioc_rw {
STAILQ_HEAD(smbrqh, smb_rq);
struct smb_dev {
+ struct cdev * dev;
int sd_opened;
int sd_level;
struct smb_vc * sd_vc; /* reference to VC */
struct smb_share *sd_share; /* reference to share if any */
int sd_poll;
int sd_seq;
-/* struct ifqueue sd_rdqueue;
- struct ifqueue sd_wrqueue;
- struct selinfo sd_pollinfo;
- struct smbrqh sd_rqlist;
- struct smbrqh sd_rplist;
- struct ucred *sd_owner;*/
int sd_flags;
+ int refcount;
+ int usecount;
};
+extern struct sx smb_lock;
+#define SMB_LOCK() sx_xlock(&smb_lock)
+#define SMB_UNLOCK() sx_unlock(&smb_lock)
+#define SMB_LOCKASSERT() sx_assert(&smb_lock, SA_XLOCKED)
+
struct smb_cred;
+
+void sdp_dtor(void *arg);
+void sdp_trydestroy(struct smb_dev *dev);
+
/*
* Compound user interface
*/
@@ -185,7 +191,7 @@ int smb_usr_simplerequest(struct smb_share *ssp, struct smbioc_rq *data,
int smb_usr_t2request(struct smb_share *ssp, struct smbioc_t2rq *data,
struct smb_cred *scred);
int smb_dev2share(int fd, int mode, struct smb_cred *scred,
- struct smb_share **sspp);
+ struct smb_share **sspp, struct smb_dev **ssdp);
#endif /* _KERNEL */