Allow unloading of vfs's if the refcount is 0.
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mycroft
parent
480c10c23a
commit
22bdb84b17
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@ -1,4 +1,4 @@
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/* $NetBSD: kern_lkm.c,v 1.18 1994/06/29 06:32:31 cgd Exp $ */
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/* $NetBSD: kern_lkm.c,v 1.19 1994/09/22 02:22:42 mycroft Exp $ */
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/*
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* Copyright (c) 1994 Christopher G. Demetriou
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@ -91,7 +91,7 @@ lkmopen(dev, flag, devtype, p)
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int error;
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if (minor(dev) != 0)
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return(ENXIO); /* bad minor # */
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return (ENXIO); /* bad minor # */
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/*
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* Use of the loadable kernel module device must be exclusive; we
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@ -100,18 +100,18 @@ lkmopen(dev, flag, devtype, p)
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*/
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while (lkm_v & LKM_ALLOC) {
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if (flag & FNONBLOCK) /* don't hang */
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return(EBUSY);
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return (EBUSY);
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lkm_v |= LKM_WANT;
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/*
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* Sleep pending unlock; we use tsleep() to allow
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* an alarm out of the open.
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*/
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if (error = tsleep((caddr_t)&lkm_v, TTIPRI|PCATCH, "lkmopn", 0))
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return(error); /* leave LKM_WANT set -- no problem */
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return (error); /* leave LKM_WANT set -- no problem */
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}
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lkm_v |= LKM_ALLOC;
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return(0); /* pseudo-device open */
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return (0); /* pseudo-device open */
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}
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/*
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@ -149,7 +149,7 @@ lkmclose(dev, flag, mode, p)
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#ifdef DEBUG
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printf("LKM: close before open!\n");
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#endif /* DEBUG */
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return(EBADF);
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return (EBADF);
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}
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/* do this before waking the herd... */
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@ -165,7 +165,7 @@ lkmclose(dev, flag, mode, p)
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lkm_v &= ~LKM_ALLOC;
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wakeup((caddr_t)&lkm_v); /* thundering herd "problem" here */
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return(0); /* pseudo-device closed */
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return (0); /* pseudo-device closed */
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}
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/*ARGSUSED*/
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@ -440,7 +440,7 @@ int
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lkmnosys()
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{
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return(nosys());
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return (nosys());
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}
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/*
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@ -454,7 +454,7 @@ int
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lkmenodev()
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{
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return(enodev());
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return (enodev());
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}
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int
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@ -475,10 +475,10 @@ lkmexists(lkmtp)
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continue;
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if (!strcmp(lkmtp->private.lkm_any->lkm_name,
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lkmods[i].private.lkm_any->lkm_name))
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return(1); /* already loaded... */
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return (1); /* already loaded... */
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}
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return(0); /* module not loaded... */
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return (0); /* module not loaded... */
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}
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/*
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@ -499,7 +499,8 @@ _lkm_syscall(lkmtp, cmd)
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case LKM_E_LOAD:
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/* don't load twice! */
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if (lkmexists(lkmtp))
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return(EEXIST);
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return (EEXIST);
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if ((i = args->lkm_offset) == -1) { /* auto */
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/*
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* Search the table looking for a slot...
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@ -520,7 +521,7 @@ _lkm_syscall(lkmtp, cmd)
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}
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/* save old */
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bcopy(&sysent[i], &(args->lkm_oldent), sizeof(struct sysent));
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bcopy(&sysent[i], &args->lkm_oldent, sizeof(struct sysent));
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/* replace with new */
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bcopy(args->lkm_sysent, &sysent[i], sizeof(struct sysent));
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@ -535,7 +536,7 @@ _lkm_syscall(lkmtp, cmd)
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i = args->lkm_offset;
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/* replace current slot contents with old contents */
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bcopy(&(args->lkm_oldent), &sysent[i], sizeof(struct sysent));
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bcopy(&args->lkm_oldent, &sysent[i], sizeof(struct sysent));
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break;
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@ -543,7 +544,7 @@ _lkm_syscall(lkmtp, cmd)
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break;
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}
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return(err);
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return (err);
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}
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/*
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@ -563,7 +564,7 @@ _lkm_vfs(lkmtp, cmd)
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case LKM_E_LOAD:
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/* don't load twice! */
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if (lkmexists(lkmtp))
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return(EEXIST);
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return (EEXIST);
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/* make sure there's no VFS in the table with this name */
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for (i = 0; i < nvfssw; i++)
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@ -585,6 +586,7 @@ _lkm_vfs(lkmtp, cmd)
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* Set up file system
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*/
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vfssw[i] = args->lkm_vfsops;
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vfssw[i]->vfs_refcount = 0;
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/*
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* Call init function for this VFS...
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@ -596,23 +598,21 @@ _lkm_vfs(lkmtp, cmd)
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break;
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case LKM_E_UNLOAD:
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#ifdef notyet
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/* current slot... */
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i = args->lkm_offset;
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if (vfssw[i]->vfs_refcount != 0)
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return (EBUSY);
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/* replace current slot contents with old contents */
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vfssw[i] = (struct vfsops *)0;
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#else
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/* it's not safe to remove a vfs */
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err = EBUSY;
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#endif
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break;
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case LKM_E_STAT: /* no special handling... */
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break;
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}
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return(err);
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return (err);
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}
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/*
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@ -633,7 +633,8 @@ _lkm_dev(lkmtp, cmd)
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case LKM_E_LOAD:
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/* don't load twice! */
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if (lkmexists(lkmtp))
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return(EEXIST);
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return (EEXIST);
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switch(args->lkm_devtype) {
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case LM_DT_BLOCK:
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if ((i = args->lkm_offset) == -1) { /* auto */
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@ -656,7 +657,7 @@ _lkm_dev(lkmtp, cmd)
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}
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/* save old */
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bcopy(&bdevsw[i], &(args->lkm_olddev.bdev), sizeof(struct bdevsw));
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bcopy(&bdevsw[i], &args->lkm_olddev.bdev, sizeof(struct bdevsw));
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/* replace with new */
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bcopy(args->lkm_dev.bdev, &bdevsw[i], sizeof(struct bdevsw));
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@ -686,7 +687,7 @@ _lkm_dev(lkmtp, cmd)
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}
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/* save old */
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bcopy(&cdevsw[i], &(args->lkm_olddev.cdev), sizeof(struct cdevsw));
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bcopy(&cdevsw[i], &args->lkm_olddev.cdev, sizeof(struct cdevsw));
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/* replace with new */
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bcopy(args->lkm_dev.cdev, &cdevsw[i], sizeof(struct cdevsw));
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@ -709,12 +710,12 @@ _lkm_dev(lkmtp, cmd)
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switch(args->lkm_devtype) {
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case LM_DT_BLOCK:
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/* replace current slot contents with old contents */
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bcopy(&(args->lkm_olddev.bdev), &bdevsw[i], sizeof(struct bdevsw));
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bcopy(&args->lkm_olddev.bdev, &bdevsw[i], sizeof(struct bdevsw));
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break;
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case LM_DT_CHAR:
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/* replace current slot contents with old contents */
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bcopy(&(args->lkm_olddev.cdev), &cdevsw[i], sizeof(struct cdevsw));
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bcopy(&args->lkm_olddev.cdev, &cdevsw[i], sizeof(struct cdevsw));
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break;
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default:
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@ -727,7 +728,7 @@ _lkm_dev(lkmtp, cmd)
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break;
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}
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return(err);
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return (err);
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}
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#ifdef STREAMS
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@ -748,7 +749,7 @@ _lkm_strmod(lkmtp, cmd)
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case LKM_E_LOAD:
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/* don't load twice! */
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if (lkmexists(lkmtp))
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return(EEXIST);
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return (EEXIST);
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break;
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case LKM_E_UNLOAD:
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@ -758,7 +759,7 @@ _lkm_strmod(lkmtp, cmd)
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break;
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}
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return(err);
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return (err);
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}
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#endif /* STREAMS */
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@ -779,7 +780,8 @@ _lkm_exec(lkmtp, cmd)
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case LKM_E_LOAD:
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/* don't load twice! */
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if (lkmexists(lkmtp))
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return(EEXIST);
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return (EEXIST);
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if ((i = args->lkm_offset) == -1) { /* auto */
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/*
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* Search the table looking for a slot...
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@ -800,7 +802,7 @@ _lkm_exec(lkmtp, cmd)
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}
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/* save old */
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bcopy(&execsw[i], &(args->lkm_oldexec), sizeof(struct execsw));
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bcopy(&execsw[i], &args->lkm_oldexec, sizeof(struct execsw));
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/* replace with new */
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bcopy(args->lkm_exec, &execsw[i], sizeof(struct execsw));
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@ -818,7 +820,7 @@ _lkm_exec(lkmtp, cmd)
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i = args->lkm_offset;
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/* replace current slot contents with old contents */
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bcopy(&(args->lkm_oldexec), &execsw[i], sizeof(struct execsw));
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bcopy(&args->lkm_oldexec, &execsw[i], sizeof(struct execsw));
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/* realize need to recompute max header size */
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exec_maxhdrsz = 0;
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@ -829,7 +831,7 @@ _lkm_exec(lkmtp, cmd)
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break;
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}
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return(err);
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return (err);
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}
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/*
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@ -879,5 +881,5 @@ lkmdispatch(lkmtp, cmd)
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break;
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}
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return(err);
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return (err);
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}
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