diff options
author | phk <phk@FreeBSD.org> | 1999-08-30 07:56:23 +0000 |
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committer | phk <phk@FreeBSD.org> | 1999-08-30 07:56:23 +0000 |
commit | 216936ca6d54e77a70cdfe5305d1ba3ac2412fad (patch) | |
tree | 08111cbf8cb75c2fe1dbf514a18ed740cd870dce /sys/miscfs | |
parent | dac43b022432b627a46c3aa4772dd215541b193b (diff) | |
download | FreeBSD-src-216936ca6d54e77a70cdfe5305d1ba3ac2412fad.zip FreeBSD-src-216936ca6d54e77a70cdfe5305d1ba3ac2412fad.tar.gz |
Make bdev userland access work like cdev userland access unless
the highly non-recommended option ALLOW_BDEV_ACCESS is used.
(bdev access is evil because you don't get write errors reported.)
Kill si_bsize_best before it kills Matt :-)
Use the specfs routines rather having cloned copies in devfs.
Diffstat (limited to 'sys/miscfs')
-rw-r--r-- | sys/miscfs/devfs/devfs_vnops.c | 188 | ||||
-rw-r--r-- | sys/miscfs/specfs/spec_vnops.c | 59 |
2 files changed, 36 insertions, 211 deletions
diff --git a/sys/miscfs/devfs/devfs_vnops.c b/sys/miscfs/devfs/devfs_vnops.c index 9d6ce13..ea63d3a 100644 --- a/sys/miscfs/devfs/devfs_vnops.c +++ b/sys/miscfs/devfs/devfs_vnops.c @@ -26,7 +26,6 @@ * $FreeBSD$ */ - #include <sys/param.h> #include <sys/systm.h> #include <sys/buf.h> @@ -651,7 +650,7 @@ devfs_xwrite(struct vop_write_args *ap) case VBLK: panic("devfs: vnode methods"); default: - panic("devfs_write(): bad file type"); + panic("devfs_xwrite(): bad file type"); } } @@ -1412,199 +1411,24 @@ devfs_open( struct vop_open_args *ap) return (error); } -/* - * Vnode op for read - struct vop_read_args { - struct vnode *a_vp; - struct uio *a_uio; - int a_ioflag; - struct ucred *a_cred; - } - */ /* ARGSUSED */ static int devfs_read( struct vop_read_args *ap) { - struct vnode *vp = ap->a_vp; - struct uio *uio = ap->a_uio; - struct proc *p = uio->uio_procp; - struct buf *bp; - daddr_t bn, nextbn; - long bsize, bscale; - struct partinfo dpart; - int n, on; - d_ioctl_t *ioctl; - int error = 0; - dev_t dev; - dn_p dnp; - - if ((error = devfs_vntodn(vp,&dnp)) != 0) - return error; - - -#ifdef DIAGNOSTIC - if (uio->uio_rw != UIO_READ) - panic("devfs_read mode"); - if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) - panic("devfs_read proc"); -#endif - if (uio->uio_resid == 0) - return (0); - - switch (vp->v_type) { - - case VCHR: - VOP_UNLOCK(vp, 0, p); - error = (*vp->v_rdev->si_devsw->d_read) - (vp->v_rdev, uio, ap->a_ioflag); - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); - break; - - case VBLK: - if (uio->uio_offset < 0) - return (EINVAL); - /* - * Calculate block size for block device. The block size must - * be larger then the physical minimum. - */ + int error; - dev = vp->v_rdev; - bsize = dev->si_bsize_best; - /* - * This is a hack! - */ - if ( (ioctl = dev->si_devsw->d_ioctl) != NULL && - (*ioctl)(dev, DIOCGPART, (caddr_t)&dpart, FREAD, p) == 0 && - dpart.part->p_fstype == FS_BSDFFS && - dpart.part->p_frag != 0 && dpart.part->p_fsize != 0) - bsize = dpart.part->p_frag * dpart.part->p_fsize; - bscale = btodb(bsize); - /* - * Get buffers with this data from the buffer cache. - * If it's not there the strategy() entrypoint will be called. - * We may do this in several chunks. - */ - do { - bn = btodb(uio->uio_offset) & ~(bscale - 1); - on = uio->uio_offset % bsize; - n = min((unsigned)(bsize - on), uio->uio_resid); - if (vp->v_lastr + bscale == bn) { - nextbn = bn + bscale; - error = breadn(vp, bn, (int)bsize, &nextbn, - (int *)&bsize, 1, NOCRED, &bp); - } else - error = bread(vp, bn, (int)bsize, NOCRED, &bp); - vp->v_lastr = bn; - n = min(n, bsize - bp->b_resid); - if (error) { - brelse(bp); - return (error); - } - /* - * Copy it to the user's space - */ - error = uiomove((char *)bp->b_data + on, n, uio); - brelse(bp); - } while (error == 0 && uio->uio_resid > 0 && n != 0); - break; - default: - panic("devfs_read type"); - } - if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) - dnp->flags |= IN_ACCESS; + error = VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap); return (error); } -/* - * Vnode op for write - struct vop_write_args { - struct vnode *a_vp; - struct uio *a_uio; - int a_ioflag; - struct ucred *a_cred; - } - */ /* ARGSUSED */ static int devfs_write( struct vop_write_args *ap) { - struct vnode *vp = ap->a_vp; - struct uio *uio = ap->a_uio; - struct proc *p = uio->uio_procp; - struct buf *bp; - daddr_t bn; - int bsize, blkmask; - struct partinfo dpart; - int n, on; - int error = 0; - dn_p dnp; - - if ((error = devfs_vntodn(vp,&dnp)) != 0) - return error; - - -#ifdef DIAGNOSTIC - if (uio->uio_rw != UIO_WRITE) - panic("devfs_write mode"); - if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) - panic("devfs_write proc"); -#endif - - switch (vp->v_type) { - - case VCHR: - VOP_UNLOCK(vp, 0, p); - error = (*vp->v_rdev->si_devsw->d_write) - (vp->v_rdev, uio, ap->a_ioflag); - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); - return (error); - - case VBLK: - if (uio->uio_resid == 0) - return (0); - if (uio->uio_offset < 0) - return (EINVAL); - - /* - * Calculate block size for block device. The block size must - * be larger then the physical minimum. - */ - bsize = vp->v_rdev->si_bsize_best; - - if ((vp->v_rdev->si_devsw->d_ioctl != NULL) - && ((*vp->v_rdev->si_devsw->d_ioctl)(vp->v_rdev, DIOCGPART, - (caddr_t)&dpart, FREAD, p) == 0) - && (dpart.part->p_fstype == FS_BSDFFS) - && (dpart.part->p_frag != 0) - && (dpart.part->p_fsize != 0)) { - bsize = dpart.part->p_frag * dpart.part->p_fsize; - } - blkmask = btodb(bsize) - 1; - do { - bn = btodb(uio->uio_offset) & ~blkmask; - on = uio->uio_offset % bsize; - n = min((unsigned)(bsize - on), uio->uio_resid); - if (n == bsize) - bp = getblk(vp, bn, bsize, 0, 0); - else - error = bread(vp, bn, bsize, NOCRED, &bp); - if (error) { - brelse(bp); - return (error); - } - n = min(n, bsize - bp->b_resid); - error = uiomove((char *)bp->b_data + on, n, uio); - if (n + on == bsize) - bawrite(bp); - else - bdwrite(bp); - } while (error == 0 && uio->uio_resid > 0 && n != 0); - return (error); + int error; - default: - panic("devfs_write type"); - } - /* NOTREACHED */ + error = VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap); + return (error); } /* diff --git a/sys/miscfs/specfs/spec_vnops.c b/sys/miscfs/specfs/spec_vnops.c index 1afc400..e097ef8 100644 --- a/sys/miscfs/specfs/spec_vnops.c +++ b/sys/miscfs/specfs/spec_vnops.c @@ -34,6 +34,7 @@ * $FreeBSD$ */ +#include "opt_fs.h" #include <sys/param.h> #include <sys/proc.h> #include <sys/systm.h> @@ -258,6 +259,8 @@ spec_read(ap) int error = 0; dev_t dev; + dev = vp->v_rdev; + #ifdef DIAGNOSTIC if (uio->uio_rw != UIO_READ) panic("spec_read mode"); @@ -269,24 +272,14 @@ spec_read(ap) switch (vp->v_type) { - case VCHR: - VOP_UNLOCK(vp, 0, p); - error = (*devsw(vp->v_rdev)->d_read) - (vp->v_rdev, uio, ap->a_ioflag); - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); - return (error); - case VBLK: +#ifdef ALLOW_BDEV_ACCESS if (uio->uio_offset < 0) return (EINVAL); - dev = vp->v_rdev; - - /* - * Calculate block size for block device. The block size must - * be larger then the physical minimum. - */ - bsize = vp->v_rdev->si_bsize_best; + bsize = dev->si_bsize_phys; + while (bsize < dev->si_bsize_max && bsize < uio->uio_resid) + bsize <<= 1; if ((ioctl = devsw(dev)->d_ioctl) != NULL && (*ioctl)(dev, DIOCGPART, (caddr_t)&dpart, FREAD, p) == 0 && @@ -314,6 +307,12 @@ spec_read(ap) brelse(bp); } while (error == 0 && uio->uio_resid > 0 && n != 0); return (error); +#endif /* ALLOW_BDEV_ACCESS */ + case VCHR: + VOP_UNLOCK(vp, 0, p); + error = (*devsw(dev)->d_read) (dev, uio, ap->a_ioflag); + vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); + return (error); default: panic("spec_read type"); @@ -343,36 +342,30 @@ spec_write(ap) struct partinfo dpart; register int n, on; int error = 0; + dev_t dev; + dev = vp->v_rdev; #ifdef DIAGNOSTIC if (uio->uio_rw != UIO_WRITE) panic("spec_write mode"); if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) panic("spec_write proc"); #endif + if (uio->uio_resid == 0) + return (0); switch (vp->v_type) { - case VCHR: - VOP_UNLOCK(vp, 0, p); - error = (*devsw(vp->v_rdev)->d_write) - (vp->v_rdev, uio, ap->a_ioflag); - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); - return (error); - case VBLK: - if (uio->uio_resid == 0) - return (0); +#ifdef ALLOW_BDEV_ACCESS if (uio->uio_offset < 0) return (EINVAL); - /* - * Calculate block size for block device. The block size must - * be larger then the physical minimum. - */ - bsize = vp->v_rdev->si_bsize_best; + bsize = dev->si_bsize_phys; + while (bsize < dev->si_bsize_max && bsize < uio->uio_resid) + bsize <<= 1; - if ((*devsw(vp->v_rdev)->d_ioctl)(vp->v_rdev, DIOCGPART, + if ((*devsw(dev)->d_ioctl)(dev, DIOCGPART, (caddr_t)&dpart, FREAD, p) == 0) { if (dpart.part->p_fstype == FS_BSDFFS && dpart.part->p_frag != 0 && dpart.part->p_fsize != 0) @@ -400,6 +393,14 @@ spec_write(ap) bdwrite(bp); } while (error == 0 && uio->uio_resid > 0 && n != 0); return (error); +#endif /* ALLOW_BDEV_ACCESS */ + + case VCHR: + VOP_UNLOCK(vp, 0, p); + error = (*devsw(dev)->d_write) + (dev, uio, ap->a_ioflag); + vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); + return (error); default: panic("spec_write type"); |