99851f359e
patch modifies makesyscalls.sh to prefix all of the non-compatibility calls (e.g. not linux_, freebsd32_) with sys_ and updates the kernel entry points and all places in the code that use them. It also fixes an additional name space collision between the kernel function psignal and the libc function of the same name by renaming the kernel psignal kern_psignal(). By introducing this change now we will ease future MFCs that change syscalls. Reviewed by: rwatson Approved by: re (bz)
1416 lines
32 KiB
C
1416 lines
32 KiB
C
/*-
|
|
* Copyright (c) 1982, 1986, 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)vfs_vnops.c 8.2 (Berkeley) 1/21/94
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/file.h>
|
|
#include <sys/kdb.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/limits.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/filio.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/ttycom.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/unistd.h>
|
|
|
|
#include <security/audit/audit.h>
|
|
#include <security/mac/mac_framework.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_object.h>
|
|
|
|
static fo_rdwr_t vn_read;
|
|
static fo_rdwr_t vn_write;
|
|
static fo_truncate_t vn_truncate;
|
|
static fo_ioctl_t vn_ioctl;
|
|
static fo_poll_t vn_poll;
|
|
static fo_kqfilter_t vn_kqfilter;
|
|
static fo_stat_t vn_statfile;
|
|
static fo_close_t vn_closefile;
|
|
|
|
struct fileops vnops = {
|
|
.fo_read = vn_read,
|
|
.fo_write = vn_write,
|
|
.fo_truncate = vn_truncate,
|
|
.fo_ioctl = vn_ioctl,
|
|
.fo_poll = vn_poll,
|
|
.fo_kqfilter = vn_kqfilter,
|
|
.fo_stat = vn_statfile,
|
|
.fo_close = vn_closefile,
|
|
.fo_chmod = vn_chmod,
|
|
.fo_chown = vn_chown,
|
|
.fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
|
|
};
|
|
|
|
int
|
|
vn_open(ndp, flagp, cmode, fp)
|
|
struct nameidata *ndp;
|
|
int *flagp, cmode;
|
|
struct file *fp;
|
|
{
|
|
struct thread *td = ndp->ni_cnd.cn_thread;
|
|
|
|
return (vn_open_cred(ndp, flagp, cmode, 0, td->td_ucred, fp));
|
|
}
|
|
|
|
/*
|
|
* Common code for vnode open operations.
|
|
* Check permissions, and call the VOP_OPEN or VOP_CREATE routine.
|
|
*
|
|
* Note that this does NOT free nameidata for the successful case,
|
|
* due to the NDINIT being done elsewhere.
|
|
*/
|
|
int
|
|
vn_open_cred(struct nameidata *ndp, int *flagp, int cmode, u_int vn_open_flags,
|
|
struct ucred *cred, struct file *fp)
|
|
{
|
|
struct vnode *vp;
|
|
struct mount *mp;
|
|
struct thread *td = ndp->ni_cnd.cn_thread;
|
|
struct vattr vat;
|
|
struct vattr *vap = &vat;
|
|
int fmode, error;
|
|
accmode_t accmode;
|
|
int vfslocked, mpsafe;
|
|
|
|
mpsafe = ndp->ni_cnd.cn_flags & MPSAFE;
|
|
restart:
|
|
vfslocked = 0;
|
|
fmode = *flagp;
|
|
if (fmode & O_CREAT) {
|
|
ndp->ni_cnd.cn_nameiop = CREATE;
|
|
ndp->ni_cnd.cn_flags = ISOPEN | LOCKPARENT | LOCKLEAF |
|
|
MPSAFE;
|
|
if ((fmode & O_EXCL) == 0 && (fmode & O_NOFOLLOW) == 0)
|
|
ndp->ni_cnd.cn_flags |= FOLLOW;
|
|
if (!(vn_open_flags & VN_OPEN_NOAUDIT))
|
|
ndp->ni_cnd.cn_flags |= AUDITVNODE1;
|
|
bwillwrite();
|
|
if ((error = namei(ndp)) != 0)
|
|
return (error);
|
|
vfslocked = NDHASGIANT(ndp);
|
|
if (!mpsafe)
|
|
ndp->ni_cnd.cn_flags &= ~MPSAFE;
|
|
if (ndp->ni_vp == NULL) {
|
|
VATTR_NULL(vap);
|
|
vap->va_type = VREG;
|
|
vap->va_mode = cmode;
|
|
if (fmode & O_EXCL)
|
|
vap->va_vaflags |= VA_EXCLUSIVE;
|
|
if (vn_start_write(ndp->ni_dvp, &mp, V_NOWAIT) != 0) {
|
|
NDFREE(ndp, NDF_ONLY_PNBUF);
|
|
vput(ndp->ni_dvp);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
if ((error = vn_start_write(NULL, &mp,
|
|
V_XSLEEP | PCATCH)) != 0)
|
|
return (error);
|
|
goto restart;
|
|
}
|
|
#ifdef MAC
|
|
error = mac_vnode_check_create(cred, ndp->ni_dvp,
|
|
&ndp->ni_cnd, vap);
|
|
if (error == 0)
|
|
#endif
|
|
error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
|
|
&ndp->ni_cnd, vap);
|
|
vput(ndp->ni_dvp);
|
|
vn_finished_write(mp);
|
|
if (error) {
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
NDFREE(ndp, NDF_ONLY_PNBUF);
|
|
return (error);
|
|
}
|
|
fmode &= ~O_TRUNC;
|
|
vp = ndp->ni_vp;
|
|
} else {
|
|
if (ndp->ni_dvp == ndp->ni_vp)
|
|
vrele(ndp->ni_dvp);
|
|
else
|
|
vput(ndp->ni_dvp);
|
|
ndp->ni_dvp = NULL;
|
|
vp = ndp->ni_vp;
|
|
if (fmode & O_EXCL) {
|
|
error = EEXIST;
|
|
goto bad;
|
|
}
|
|
fmode &= ~O_CREAT;
|
|
}
|
|
} else {
|
|
ndp->ni_cnd.cn_nameiop = LOOKUP;
|
|
ndp->ni_cnd.cn_flags = ISOPEN |
|
|
((fmode & O_NOFOLLOW) ? NOFOLLOW : FOLLOW) |
|
|
LOCKLEAF | MPSAFE;
|
|
if (!(fmode & FWRITE))
|
|
ndp->ni_cnd.cn_flags |= LOCKSHARED;
|
|
if (!(vn_open_flags & VN_OPEN_NOAUDIT))
|
|
ndp->ni_cnd.cn_flags |= AUDITVNODE1;
|
|
if ((error = namei(ndp)) != 0)
|
|
return (error);
|
|
if (!mpsafe)
|
|
ndp->ni_cnd.cn_flags &= ~MPSAFE;
|
|
vfslocked = NDHASGIANT(ndp);
|
|
vp = ndp->ni_vp;
|
|
}
|
|
if (vp->v_type == VLNK) {
|
|
error = EMLINK;
|
|
goto bad;
|
|
}
|
|
if (vp->v_type == VSOCK) {
|
|
error = EOPNOTSUPP;
|
|
goto bad;
|
|
}
|
|
if (vp->v_type != VDIR && fmode & O_DIRECTORY) {
|
|
error = ENOTDIR;
|
|
goto bad;
|
|
}
|
|
accmode = 0;
|
|
if (fmode & (FWRITE | O_TRUNC)) {
|
|
if (vp->v_type == VDIR) {
|
|
error = EISDIR;
|
|
goto bad;
|
|
}
|
|
accmode |= VWRITE;
|
|
}
|
|
if (fmode & FREAD)
|
|
accmode |= VREAD;
|
|
if (fmode & FEXEC)
|
|
accmode |= VEXEC;
|
|
if ((fmode & O_APPEND) && (fmode & FWRITE))
|
|
accmode |= VAPPEND;
|
|
#ifdef MAC
|
|
error = mac_vnode_check_open(cred, vp, accmode);
|
|
if (error)
|
|
goto bad;
|
|
#endif
|
|
if ((fmode & O_CREAT) == 0) {
|
|
if (accmode & VWRITE) {
|
|
error = vn_writechk(vp);
|
|
if (error)
|
|
goto bad;
|
|
}
|
|
if (accmode) {
|
|
error = VOP_ACCESS(vp, accmode, cred, td);
|
|
if (error)
|
|
goto bad;
|
|
}
|
|
}
|
|
if ((error = VOP_OPEN(vp, fmode, cred, td, fp)) != 0)
|
|
goto bad;
|
|
|
|
if (fmode & FWRITE)
|
|
vp->v_writecount++;
|
|
*flagp = fmode;
|
|
ASSERT_VOP_LOCKED(vp, "vn_open_cred");
|
|
if (!mpsafe)
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (0);
|
|
bad:
|
|
NDFREE(ndp, NDF_ONLY_PNBUF);
|
|
vput(vp);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
*flagp = fmode;
|
|
ndp->ni_vp = NULL;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Check for write permissions on the specified vnode.
|
|
* Prototype text segments cannot be written.
|
|
*/
|
|
int
|
|
vn_writechk(vp)
|
|
register struct vnode *vp;
|
|
{
|
|
|
|
ASSERT_VOP_LOCKED(vp, "vn_writechk");
|
|
/*
|
|
* If there's shared text associated with
|
|
* the vnode, try to free it up once. If
|
|
* we fail, we can't allow writing.
|
|
*/
|
|
if (vp->v_vflag & VV_TEXT)
|
|
return (ETXTBSY);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Vnode close call
|
|
*/
|
|
int
|
|
vn_close(vp, flags, file_cred, td)
|
|
register struct vnode *vp;
|
|
int flags;
|
|
struct ucred *file_cred;
|
|
struct thread *td;
|
|
{
|
|
struct mount *mp;
|
|
int error, lock_flags;
|
|
|
|
if (!(flags & FWRITE) && vp->v_mount != NULL &&
|
|
vp->v_mount->mnt_kern_flag & MNTK_EXTENDED_SHARED)
|
|
lock_flags = LK_SHARED;
|
|
else
|
|
lock_flags = LK_EXCLUSIVE;
|
|
|
|
VFS_ASSERT_GIANT(vp->v_mount);
|
|
|
|
vn_start_write(vp, &mp, V_WAIT);
|
|
vn_lock(vp, lock_flags | LK_RETRY);
|
|
if (flags & FWRITE) {
|
|
VNASSERT(vp->v_writecount > 0, vp,
|
|
("vn_close: negative writecount"));
|
|
vp->v_writecount--;
|
|
}
|
|
error = VOP_CLOSE(vp, flags, file_cred, td);
|
|
vput(vp);
|
|
vn_finished_write(mp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Heuristic to detect sequential operation.
|
|
*/
|
|
static int
|
|
sequential_heuristic(struct uio *uio, struct file *fp)
|
|
{
|
|
|
|
if (atomic_load_acq_int(&(fp->f_flag)) & FRDAHEAD)
|
|
return (fp->f_seqcount << IO_SEQSHIFT);
|
|
|
|
/*
|
|
* Offset 0 is handled specially. open() sets f_seqcount to 1 so
|
|
* that the first I/O is normally considered to be slightly
|
|
* sequential. Seeking to offset 0 doesn't change sequentiality
|
|
* unless previous seeks have reduced f_seqcount to 0, in which
|
|
* case offset 0 is not special.
|
|
*/
|
|
if ((uio->uio_offset == 0 && fp->f_seqcount > 0) ||
|
|
uio->uio_offset == fp->f_nextoff) {
|
|
/*
|
|
* f_seqcount is in units of fixed-size blocks so that it
|
|
* depends mainly on the amount of sequential I/O and not
|
|
* much on the number of sequential I/O's. The fixed size
|
|
* of 16384 is hard-coded here since it is (not quite) just
|
|
* a magic size that works well here. This size is more
|
|
* closely related to the best I/O size for real disks than
|
|
* to any block size used by software.
|
|
*/
|
|
fp->f_seqcount += howmany(uio->uio_resid, 16384);
|
|
if (fp->f_seqcount > IO_SEQMAX)
|
|
fp->f_seqcount = IO_SEQMAX;
|
|
return (fp->f_seqcount << IO_SEQSHIFT);
|
|
}
|
|
|
|
/* Not sequential. Quickly draw-down sequentiality. */
|
|
if (fp->f_seqcount > 1)
|
|
fp->f_seqcount = 1;
|
|
else
|
|
fp->f_seqcount = 0;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Package up an I/O request on a vnode into a uio and do it.
|
|
*/
|
|
int
|
|
vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, active_cred, file_cred,
|
|
aresid, td)
|
|
enum uio_rw rw;
|
|
struct vnode *vp;
|
|
void *base;
|
|
int len;
|
|
off_t offset;
|
|
enum uio_seg segflg;
|
|
int ioflg;
|
|
struct ucred *active_cred;
|
|
struct ucred *file_cred;
|
|
int *aresid;
|
|
struct thread *td;
|
|
{
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
struct mount *mp;
|
|
struct ucred *cred;
|
|
int error, lock_flags;
|
|
|
|
VFS_ASSERT_GIANT(vp->v_mount);
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0) {
|
|
mp = NULL;
|
|
if (rw == UIO_WRITE) {
|
|
if (vp->v_type != VCHR &&
|
|
(error = vn_start_write(vp, &mp, V_WAIT | PCATCH))
|
|
!= 0)
|
|
return (error);
|
|
if (MNT_SHARED_WRITES(mp) ||
|
|
((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) {
|
|
lock_flags = LK_SHARED;
|
|
} else {
|
|
lock_flags = LK_EXCLUSIVE;
|
|
}
|
|
vn_lock(vp, lock_flags | LK_RETRY);
|
|
} else
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
|
|
}
|
|
ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held");
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
aiov.iov_base = base;
|
|
aiov.iov_len = len;
|
|
auio.uio_resid = len;
|
|
auio.uio_offset = offset;
|
|
auio.uio_segflg = segflg;
|
|
auio.uio_rw = rw;
|
|
auio.uio_td = td;
|
|
error = 0;
|
|
#ifdef MAC
|
|
if ((ioflg & IO_NOMACCHECK) == 0) {
|
|
if (rw == UIO_READ)
|
|
error = mac_vnode_check_read(active_cred, file_cred,
|
|
vp);
|
|
else
|
|
error = mac_vnode_check_write(active_cred, file_cred,
|
|
vp);
|
|
}
|
|
#endif
|
|
if (error == 0) {
|
|
if (file_cred)
|
|
cred = file_cred;
|
|
else
|
|
cred = active_cred;
|
|
if (rw == UIO_READ)
|
|
error = VOP_READ(vp, &auio, ioflg, cred);
|
|
else
|
|
error = VOP_WRITE(vp, &auio, ioflg, cred);
|
|
}
|
|
if (aresid)
|
|
*aresid = auio.uio_resid;
|
|
else
|
|
if (auio.uio_resid && error == 0)
|
|
error = EIO;
|
|
if ((ioflg & IO_NODELOCKED) == 0) {
|
|
if (rw == UIO_WRITE && vp->v_type != VCHR)
|
|
vn_finished_write(mp);
|
|
VOP_UNLOCK(vp, 0);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Package up an I/O request on a vnode into a uio and do it. The I/O
|
|
* request is split up into smaller chunks and we try to avoid saturating
|
|
* the buffer cache while potentially holding a vnode locked, so we
|
|
* check bwillwrite() before calling vn_rdwr(). We also call kern_yield()
|
|
* to give other processes a chance to lock the vnode (either other processes
|
|
* core'ing the same binary, or unrelated processes scanning the directory).
|
|
*/
|
|
int
|
|
vn_rdwr_inchunks(rw, vp, base, len, offset, segflg, ioflg, active_cred,
|
|
file_cred, aresid, td)
|
|
enum uio_rw rw;
|
|
struct vnode *vp;
|
|
void *base;
|
|
size_t len;
|
|
off_t offset;
|
|
enum uio_seg segflg;
|
|
int ioflg;
|
|
struct ucred *active_cred;
|
|
struct ucred *file_cred;
|
|
size_t *aresid;
|
|
struct thread *td;
|
|
{
|
|
int error = 0;
|
|
int iaresid;
|
|
|
|
VFS_ASSERT_GIANT(vp->v_mount);
|
|
|
|
do {
|
|
int chunk;
|
|
|
|
/*
|
|
* Force `offset' to a multiple of MAXBSIZE except possibly
|
|
* for the first chunk, so that filesystems only need to
|
|
* write full blocks except possibly for the first and last
|
|
* chunks.
|
|
*/
|
|
chunk = MAXBSIZE - (uoff_t)offset % MAXBSIZE;
|
|
|
|
if (chunk > len)
|
|
chunk = len;
|
|
if (rw != UIO_READ && vp->v_type == VREG)
|
|
bwillwrite();
|
|
iaresid = 0;
|
|
error = vn_rdwr(rw, vp, base, chunk, offset, segflg,
|
|
ioflg, active_cred, file_cred, &iaresid, td);
|
|
len -= chunk; /* aresid calc already includes length */
|
|
if (error)
|
|
break;
|
|
offset += chunk;
|
|
base = (char *)base + chunk;
|
|
kern_yield(PRI_USER);
|
|
} while (len);
|
|
if (aresid)
|
|
*aresid = len + iaresid;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* File table vnode read routine.
|
|
*/
|
|
static int
|
|
vn_read(fp, uio, active_cred, flags, td)
|
|
struct file *fp;
|
|
struct uio *uio;
|
|
struct ucred *active_cred;
|
|
int flags;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *vp;
|
|
int error, ioflag;
|
|
struct mtx *mtxp;
|
|
int vfslocked;
|
|
|
|
KASSERT(uio->uio_td == td, ("uio_td %p is not td %p",
|
|
uio->uio_td, td));
|
|
mtxp = NULL;
|
|
vp = fp->f_vnode;
|
|
ioflag = 0;
|
|
if (fp->f_flag & FNONBLOCK)
|
|
ioflag |= IO_NDELAY;
|
|
if (fp->f_flag & O_DIRECT)
|
|
ioflag |= IO_DIRECT;
|
|
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
|
|
/*
|
|
* According to McKusick the vn lock was protecting f_offset here.
|
|
* It is now protected by the FOFFSET_LOCKED flag.
|
|
*/
|
|
if ((flags & FOF_OFFSET) == 0) {
|
|
mtxp = mtx_pool_find(mtxpool_sleep, fp);
|
|
mtx_lock(mtxp);
|
|
while(fp->f_vnread_flags & FOFFSET_LOCKED) {
|
|
fp->f_vnread_flags |= FOFFSET_LOCK_WAITING;
|
|
msleep(&fp->f_vnread_flags, mtxp, PUSER -1,
|
|
"vnread offlock", 0);
|
|
}
|
|
fp->f_vnread_flags |= FOFFSET_LOCKED;
|
|
mtx_unlock(mtxp);
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
uio->uio_offset = fp->f_offset;
|
|
} else
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
|
|
ioflag |= sequential_heuristic(uio, fp);
|
|
|
|
#ifdef MAC
|
|
error = mac_vnode_check_read(active_cred, fp->f_cred, vp);
|
|
if (error == 0)
|
|
#endif
|
|
error = VOP_READ(vp, uio, ioflag, fp->f_cred);
|
|
if ((flags & FOF_OFFSET) == 0) {
|
|
fp->f_offset = uio->uio_offset;
|
|
mtx_lock(mtxp);
|
|
if (fp->f_vnread_flags & FOFFSET_LOCK_WAITING)
|
|
wakeup(&fp->f_vnread_flags);
|
|
fp->f_vnread_flags = 0;
|
|
mtx_unlock(mtxp);
|
|
}
|
|
fp->f_nextoff = uio->uio_offset;
|
|
VOP_UNLOCK(vp, 0);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* File table vnode write routine.
|
|
*/
|
|
static int
|
|
vn_write(fp, uio, active_cred, flags, td)
|
|
struct file *fp;
|
|
struct uio *uio;
|
|
struct ucred *active_cred;
|
|
int flags;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *vp;
|
|
struct mount *mp;
|
|
int error, ioflag, lock_flags;
|
|
int vfslocked;
|
|
|
|
KASSERT(uio->uio_td == td, ("uio_td %p is not td %p",
|
|
uio->uio_td, td));
|
|
vp = fp->f_vnode;
|
|
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
|
|
if (vp->v_type == VREG)
|
|
bwillwrite();
|
|
ioflag = IO_UNIT;
|
|
if (vp->v_type == VREG && (fp->f_flag & O_APPEND))
|
|
ioflag |= IO_APPEND;
|
|
if (fp->f_flag & FNONBLOCK)
|
|
ioflag |= IO_NDELAY;
|
|
if (fp->f_flag & O_DIRECT)
|
|
ioflag |= IO_DIRECT;
|
|
if ((fp->f_flag & O_FSYNC) ||
|
|
(vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)))
|
|
ioflag |= IO_SYNC;
|
|
mp = NULL;
|
|
if (vp->v_type != VCHR &&
|
|
(error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
|
|
goto unlock;
|
|
|
|
if ((MNT_SHARED_WRITES(mp) ||
|
|
((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) &&
|
|
(flags & FOF_OFFSET) != 0) {
|
|
lock_flags = LK_SHARED;
|
|
} else {
|
|
lock_flags = LK_EXCLUSIVE;
|
|
}
|
|
|
|
vn_lock(vp, lock_flags | LK_RETRY);
|
|
if ((flags & FOF_OFFSET) == 0)
|
|
uio->uio_offset = fp->f_offset;
|
|
ioflag |= sequential_heuristic(uio, fp);
|
|
#ifdef MAC
|
|
error = mac_vnode_check_write(active_cred, fp->f_cred, vp);
|
|
if (error == 0)
|
|
#endif
|
|
error = VOP_WRITE(vp, uio, ioflag, fp->f_cred);
|
|
if ((flags & FOF_OFFSET) == 0)
|
|
fp->f_offset = uio->uio_offset;
|
|
fp->f_nextoff = uio->uio_offset;
|
|
VOP_UNLOCK(vp, 0);
|
|
if (vp->v_type != VCHR)
|
|
vn_finished_write(mp);
|
|
unlock:
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* File table truncate routine.
|
|
*/
|
|
static int
|
|
vn_truncate(fp, length, active_cred, td)
|
|
struct file *fp;
|
|
off_t length;
|
|
struct ucred *active_cred;
|
|
struct thread *td;
|
|
{
|
|
struct vattr vattr;
|
|
struct mount *mp;
|
|
struct vnode *vp;
|
|
int vfslocked;
|
|
int error;
|
|
|
|
vp = fp->f_vnode;
|
|
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
|
|
error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
|
|
if (error) {
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
if (vp->v_type == VDIR) {
|
|
error = EISDIR;
|
|
goto out;
|
|
}
|
|
#ifdef MAC
|
|
error = mac_vnode_check_write(active_cred, fp->f_cred, vp);
|
|
if (error)
|
|
goto out;
|
|
#endif
|
|
error = vn_writechk(vp);
|
|
if (error == 0) {
|
|
VATTR_NULL(&vattr);
|
|
vattr.va_size = length;
|
|
error = VOP_SETATTR(vp, &vattr, fp->f_cred);
|
|
}
|
|
out:
|
|
VOP_UNLOCK(vp, 0);
|
|
vn_finished_write(mp);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* File table vnode stat routine.
|
|
*/
|
|
static int
|
|
vn_statfile(fp, sb, active_cred, td)
|
|
struct file *fp;
|
|
struct stat *sb;
|
|
struct ucred *active_cred;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *vp = fp->f_vnode;
|
|
int vfslocked;
|
|
int error;
|
|
|
|
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
error = vn_stat(vp, sb, active_cred, fp->f_cred, td);
|
|
VOP_UNLOCK(vp, 0);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Stat a vnode; implementation for the stat syscall
|
|
*/
|
|
int
|
|
vn_stat(vp, sb, active_cred, file_cred, td)
|
|
struct vnode *vp;
|
|
register struct stat *sb;
|
|
struct ucred *active_cred;
|
|
struct ucred *file_cred;
|
|
struct thread *td;
|
|
{
|
|
struct vattr vattr;
|
|
register struct vattr *vap;
|
|
int error;
|
|
u_short mode;
|
|
|
|
#ifdef MAC
|
|
error = mac_vnode_check_stat(active_cred, file_cred, vp);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
vap = &vattr;
|
|
|
|
/*
|
|
* Initialize defaults for new and unusual fields, so that file
|
|
* systems which don't support these fields don't need to know
|
|
* about them.
|
|
*/
|
|
vap->va_birthtime.tv_sec = -1;
|
|
vap->va_birthtime.tv_nsec = 0;
|
|
vap->va_fsid = VNOVAL;
|
|
vap->va_rdev = NODEV;
|
|
|
|
error = VOP_GETATTR(vp, vap, active_cred);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Zero the spare stat fields
|
|
*/
|
|
bzero(sb, sizeof *sb);
|
|
|
|
/*
|
|
* Copy from vattr table
|
|
*/
|
|
if (vap->va_fsid != VNOVAL)
|
|
sb->st_dev = vap->va_fsid;
|
|
else
|
|
sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
|
|
sb->st_ino = vap->va_fileid;
|
|
mode = vap->va_mode;
|
|
switch (vap->va_type) {
|
|
case VREG:
|
|
mode |= S_IFREG;
|
|
break;
|
|
case VDIR:
|
|
mode |= S_IFDIR;
|
|
break;
|
|
case VBLK:
|
|
mode |= S_IFBLK;
|
|
break;
|
|
case VCHR:
|
|
mode |= S_IFCHR;
|
|
break;
|
|
case VLNK:
|
|
mode |= S_IFLNK;
|
|
break;
|
|
case VSOCK:
|
|
mode |= S_IFSOCK;
|
|
break;
|
|
case VFIFO:
|
|
mode |= S_IFIFO;
|
|
break;
|
|
default:
|
|
return (EBADF);
|
|
};
|
|
sb->st_mode = mode;
|
|
sb->st_nlink = vap->va_nlink;
|
|
sb->st_uid = vap->va_uid;
|
|
sb->st_gid = vap->va_gid;
|
|
sb->st_rdev = vap->va_rdev;
|
|
if (vap->va_size > OFF_MAX)
|
|
return (EOVERFLOW);
|
|
sb->st_size = vap->va_size;
|
|
sb->st_atim = vap->va_atime;
|
|
sb->st_mtim = vap->va_mtime;
|
|
sb->st_ctim = vap->va_ctime;
|
|
sb->st_birthtim = vap->va_birthtime;
|
|
|
|
/*
|
|
* According to www.opengroup.org, the meaning of st_blksize is
|
|
* "a filesystem-specific preferred I/O block size for this
|
|
* object. In some filesystem types, this may vary from file
|
|
* to file"
|
|
* Use miminum/default of PAGE_SIZE (e.g. for VCHR).
|
|
*/
|
|
|
|
sb->st_blksize = max(PAGE_SIZE, vap->va_blocksize);
|
|
|
|
sb->st_flags = vap->va_flags;
|
|
if (priv_check(td, PRIV_VFS_GENERATION))
|
|
sb->st_gen = 0;
|
|
else
|
|
sb->st_gen = vap->va_gen;
|
|
|
|
sb->st_blocks = vap->va_bytes / S_BLKSIZE;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* File table vnode ioctl routine.
|
|
*/
|
|
static int
|
|
vn_ioctl(fp, com, data, active_cred, td)
|
|
struct file *fp;
|
|
u_long com;
|
|
void *data;
|
|
struct ucred *active_cred;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *vp = fp->f_vnode;
|
|
struct vattr vattr;
|
|
int vfslocked;
|
|
int error;
|
|
|
|
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
|
|
error = ENOTTY;
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
case VDIR:
|
|
if (com == FIONREAD) {
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = VOP_GETATTR(vp, &vattr, active_cred);
|
|
VOP_UNLOCK(vp, 0);
|
|
if (!error)
|
|
*(int *)data = vattr.va_size - fp->f_offset;
|
|
}
|
|
if (com == FIONBIO || com == FIOASYNC) /* XXX */
|
|
error = 0;
|
|
else
|
|
error = VOP_IOCTL(vp, com, data, fp->f_flag,
|
|
active_cred, td);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* File table vnode poll routine.
|
|
*/
|
|
static int
|
|
vn_poll(fp, events, active_cred, td)
|
|
struct file *fp;
|
|
int events;
|
|
struct ucred *active_cred;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *vp;
|
|
int vfslocked;
|
|
int error;
|
|
|
|
vp = fp->f_vnode;
|
|
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
|
|
#ifdef MAC
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = mac_vnode_check_poll(active_cred, fp->f_cred, vp);
|
|
VOP_UNLOCK(vp, 0);
|
|
if (!error)
|
|
#endif
|
|
|
|
error = VOP_POLL(vp, events, fp->f_cred, td);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Acquire the requested lock and then check for validity. LK_RETRY
|
|
* permits vn_lock to return doomed vnodes.
|
|
*/
|
|
int
|
|
_vn_lock(struct vnode *vp, int flags, char *file, int line)
|
|
{
|
|
int error;
|
|
|
|
VNASSERT((flags & LK_TYPE_MASK) != 0, vp,
|
|
("vn_lock called with no locktype."));
|
|
do {
|
|
#ifdef DEBUG_VFS_LOCKS
|
|
KASSERT(vp->v_holdcnt != 0,
|
|
("vn_lock %p: zero hold count", vp));
|
|
#endif
|
|
error = VOP_LOCK1(vp, flags, file, line);
|
|
flags &= ~LK_INTERLOCK; /* Interlock is always dropped. */
|
|
KASSERT((flags & LK_RETRY) == 0 || error == 0,
|
|
("LK_RETRY set with incompatible flags (0x%x) or an error occured (%d)",
|
|
flags, error));
|
|
/*
|
|
* Callers specify LK_RETRY if they wish to get dead vnodes.
|
|
* If RETRY is not set, we return ENOENT instead.
|
|
*/
|
|
if (error == 0 && vp->v_iflag & VI_DOOMED &&
|
|
(flags & LK_RETRY) == 0) {
|
|
VOP_UNLOCK(vp, 0);
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
} while (flags & LK_RETRY && error != 0);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* File table vnode close routine.
|
|
*/
|
|
static int
|
|
vn_closefile(fp, td)
|
|
struct file *fp;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *vp;
|
|
struct flock lf;
|
|
int vfslocked;
|
|
int error;
|
|
|
|
vp = fp->f_vnode;
|
|
|
|
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
|
|
if (fp->f_type == DTYPE_VNODE && fp->f_flag & FHASLOCK) {
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
lf.l_type = F_UNLCK;
|
|
(void) VOP_ADVLOCK(vp, fp, F_UNLCK, &lf, F_FLOCK);
|
|
}
|
|
|
|
fp->f_ops = &badfileops;
|
|
|
|
error = vn_close(vp, fp->f_flag, fp->f_cred, td);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Preparing to start a filesystem write operation. If the operation is
|
|
* permitted, then we bump the count of operations in progress and
|
|
* proceed. If a suspend request is in progress, we wait until the
|
|
* suspension is over, and then proceed.
|
|
*/
|
|
int
|
|
vn_start_write(vp, mpp, flags)
|
|
struct vnode *vp;
|
|
struct mount **mpp;
|
|
int flags;
|
|
{
|
|
struct mount *mp;
|
|
int error;
|
|
|
|
error = 0;
|
|
/*
|
|
* If a vnode is provided, get and return the mount point that
|
|
* to which it will write.
|
|
*/
|
|
if (vp != NULL) {
|
|
if ((error = VOP_GETWRITEMOUNT(vp, mpp)) != 0) {
|
|
*mpp = NULL;
|
|
if (error != EOPNOTSUPP)
|
|
return (error);
|
|
return (0);
|
|
}
|
|
}
|
|
if ((mp = *mpp) == NULL)
|
|
return (0);
|
|
|
|
/*
|
|
* VOP_GETWRITEMOUNT() returns with the mp refcount held through
|
|
* a vfs_ref().
|
|
* As long as a vnode is not provided we need to acquire a
|
|
* refcount for the provided mountpoint too, in order to
|
|
* emulate a vfs_ref().
|
|
*/
|
|
MNT_ILOCK(mp);
|
|
if (vp == NULL)
|
|
MNT_REF(mp);
|
|
|
|
/*
|
|
* Check on status of suspension.
|
|
*/
|
|
if ((curthread->td_pflags & TDP_IGNSUSP) == 0 ||
|
|
mp->mnt_susp_owner != curthread) {
|
|
while ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0) {
|
|
if (flags & V_NOWAIT) {
|
|
error = EWOULDBLOCK;
|
|
goto unlock;
|
|
}
|
|
error = msleep(&mp->mnt_flag, MNT_MTX(mp),
|
|
(PUSER - 1) | (flags & PCATCH), "suspfs", 0);
|
|
if (error)
|
|
goto unlock;
|
|
}
|
|
}
|
|
if (flags & V_XSLEEP)
|
|
goto unlock;
|
|
mp->mnt_writeopcount++;
|
|
unlock:
|
|
if (error != 0 || (flags & V_XSLEEP) != 0)
|
|
MNT_REL(mp);
|
|
MNT_IUNLOCK(mp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Secondary suspension. Used by operations such as vop_inactive
|
|
* routines that are needed by the higher level functions. These
|
|
* are allowed to proceed until all the higher level functions have
|
|
* completed (indicated by mnt_writeopcount dropping to zero). At that
|
|
* time, these operations are halted until the suspension is over.
|
|
*/
|
|
int
|
|
vn_start_secondary_write(vp, mpp, flags)
|
|
struct vnode *vp;
|
|
struct mount **mpp;
|
|
int flags;
|
|
{
|
|
struct mount *mp;
|
|
int error;
|
|
|
|
retry:
|
|
if (vp != NULL) {
|
|
if ((error = VOP_GETWRITEMOUNT(vp, mpp)) != 0) {
|
|
*mpp = NULL;
|
|
if (error != EOPNOTSUPP)
|
|
return (error);
|
|
return (0);
|
|
}
|
|
}
|
|
/*
|
|
* If we are not suspended or have not yet reached suspended
|
|
* mode, then let the operation proceed.
|
|
*/
|
|
if ((mp = *mpp) == NULL)
|
|
return (0);
|
|
|
|
/*
|
|
* VOP_GETWRITEMOUNT() returns with the mp refcount held through
|
|
* a vfs_ref().
|
|
* As long as a vnode is not provided we need to acquire a
|
|
* refcount for the provided mountpoint too, in order to
|
|
* emulate a vfs_ref().
|
|
*/
|
|
MNT_ILOCK(mp);
|
|
if (vp == NULL)
|
|
MNT_REF(mp);
|
|
if ((mp->mnt_kern_flag & (MNTK_SUSPENDED | MNTK_SUSPEND2)) == 0) {
|
|
mp->mnt_secondary_writes++;
|
|
mp->mnt_secondary_accwrites++;
|
|
MNT_IUNLOCK(mp);
|
|
return (0);
|
|
}
|
|
if (flags & V_NOWAIT) {
|
|
MNT_REL(mp);
|
|
MNT_IUNLOCK(mp);
|
|
return (EWOULDBLOCK);
|
|
}
|
|
/*
|
|
* Wait for the suspension to finish.
|
|
*/
|
|
error = msleep(&mp->mnt_flag, MNT_MTX(mp),
|
|
(PUSER - 1) | (flags & PCATCH) | PDROP, "suspfs", 0);
|
|
vfs_rel(mp);
|
|
if (error == 0)
|
|
goto retry;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Filesystem write operation has completed. If we are suspending and this
|
|
* operation is the last one, notify the suspender that the suspension is
|
|
* now in effect.
|
|
*/
|
|
void
|
|
vn_finished_write(mp)
|
|
struct mount *mp;
|
|
{
|
|
if (mp == NULL)
|
|
return;
|
|
MNT_ILOCK(mp);
|
|
MNT_REL(mp);
|
|
mp->mnt_writeopcount--;
|
|
if (mp->mnt_writeopcount < 0)
|
|
panic("vn_finished_write: neg cnt");
|
|
if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0 &&
|
|
mp->mnt_writeopcount <= 0)
|
|
wakeup(&mp->mnt_writeopcount);
|
|
MNT_IUNLOCK(mp);
|
|
}
|
|
|
|
|
|
/*
|
|
* Filesystem secondary write operation has completed. If we are
|
|
* suspending and this operation is the last one, notify the suspender
|
|
* that the suspension is now in effect.
|
|
*/
|
|
void
|
|
vn_finished_secondary_write(mp)
|
|
struct mount *mp;
|
|
{
|
|
if (mp == NULL)
|
|
return;
|
|
MNT_ILOCK(mp);
|
|
MNT_REL(mp);
|
|
mp->mnt_secondary_writes--;
|
|
if (mp->mnt_secondary_writes < 0)
|
|
panic("vn_finished_secondary_write: neg cnt");
|
|
if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0 &&
|
|
mp->mnt_secondary_writes <= 0)
|
|
wakeup(&mp->mnt_secondary_writes);
|
|
MNT_IUNLOCK(mp);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Request a filesystem to suspend write operations.
|
|
*/
|
|
int
|
|
vfs_write_suspend(mp)
|
|
struct mount *mp;
|
|
{
|
|
int error;
|
|
|
|
MNT_ILOCK(mp);
|
|
if (mp->mnt_susp_owner == curthread) {
|
|
MNT_IUNLOCK(mp);
|
|
return (EALREADY);
|
|
}
|
|
while (mp->mnt_kern_flag & MNTK_SUSPEND)
|
|
msleep(&mp->mnt_flag, MNT_MTX(mp), PUSER - 1, "wsuspfs", 0);
|
|
mp->mnt_kern_flag |= MNTK_SUSPEND;
|
|
mp->mnt_susp_owner = curthread;
|
|
if (mp->mnt_writeopcount > 0)
|
|
(void) msleep(&mp->mnt_writeopcount,
|
|
MNT_MTX(mp), (PUSER - 1)|PDROP, "suspwt", 0);
|
|
else
|
|
MNT_IUNLOCK(mp);
|
|
if ((error = VFS_SYNC(mp, MNT_SUSPEND)) != 0)
|
|
vfs_write_resume(mp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Request a filesystem to resume write operations.
|
|
*/
|
|
void
|
|
vfs_write_resume(mp)
|
|
struct mount *mp;
|
|
{
|
|
|
|
MNT_ILOCK(mp);
|
|
if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0) {
|
|
KASSERT(mp->mnt_susp_owner == curthread, ("mnt_susp_owner"));
|
|
mp->mnt_kern_flag &= ~(MNTK_SUSPEND | MNTK_SUSPEND2 |
|
|
MNTK_SUSPENDED);
|
|
mp->mnt_susp_owner = NULL;
|
|
wakeup(&mp->mnt_writeopcount);
|
|
wakeup(&mp->mnt_flag);
|
|
curthread->td_pflags &= ~TDP_IGNSUSP;
|
|
MNT_IUNLOCK(mp);
|
|
VFS_SUSP_CLEAN(mp);
|
|
} else
|
|
MNT_IUNLOCK(mp);
|
|
}
|
|
|
|
/*
|
|
* Implement kqueues for files by translating it to vnode operation.
|
|
*/
|
|
static int
|
|
vn_kqfilter(struct file *fp, struct knote *kn)
|
|
{
|
|
int vfslocked;
|
|
int error;
|
|
|
|
vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
|
|
error = VOP_KQFILTER(fp->f_vnode, kn);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Simplified in-kernel wrapper calls for extended attribute access.
|
|
* Both calls pass in a NULL credential, authorizing as "kernel" access.
|
|
* Set IO_NODELOCKED in ioflg if the vnode is already locked.
|
|
*/
|
|
int
|
|
vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace,
|
|
const char *attrname, int *buflen, char *buf, struct thread *td)
|
|
{
|
|
struct uio auio;
|
|
struct iovec iov;
|
|
int error;
|
|
|
|
iov.iov_len = *buflen;
|
|
iov.iov_base = buf;
|
|
|
|
auio.uio_iov = &iov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_rw = UIO_READ;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
auio.uio_td = td;
|
|
auio.uio_offset = 0;
|
|
auio.uio_resid = *buflen;
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0)
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
|
|
ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held");
|
|
|
|
/* authorize attribute retrieval as kernel */
|
|
error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL,
|
|
td);
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0)
|
|
VOP_UNLOCK(vp, 0);
|
|
|
|
if (error == 0) {
|
|
*buflen = *buflen - auio.uio_resid;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* XXX failure mode if partially written?
|
|
*/
|
|
int
|
|
vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace,
|
|
const char *attrname, int buflen, char *buf, struct thread *td)
|
|
{
|
|
struct uio auio;
|
|
struct iovec iov;
|
|
struct mount *mp;
|
|
int error;
|
|
|
|
iov.iov_len = buflen;
|
|
iov.iov_base = buf;
|
|
|
|
auio.uio_iov = &iov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_rw = UIO_WRITE;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
auio.uio_td = td;
|
|
auio.uio_offset = 0;
|
|
auio.uio_resid = buflen;
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0) {
|
|
if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0)
|
|
return (error);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
}
|
|
|
|
ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held");
|
|
|
|
/* authorize attribute setting as kernel */
|
|
error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, td);
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0) {
|
|
vn_finished_write(mp);
|
|
VOP_UNLOCK(vp, 0);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace,
|
|
const char *attrname, struct thread *td)
|
|
{
|
|
struct mount *mp;
|
|
int error;
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0) {
|
|
if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0)
|
|
return (error);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
}
|
|
|
|
ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held");
|
|
|
|
/* authorize attribute removal as kernel */
|
|
error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL, td);
|
|
if (error == EOPNOTSUPP)
|
|
error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL,
|
|
NULL, td);
|
|
|
|
if ((ioflg & IO_NODELOCKED) == 0) {
|
|
vn_finished_write(mp);
|
|
VOP_UNLOCK(vp, 0);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
vn_vget_ino(struct vnode *vp, ino_t ino, int lkflags, struct vnode **rvp)
|
|
{
|
|
struct mount *mp;
|
|
int ltype, error;
|
|
|
|
mp = vp->v_mount;
|
|
ltype = VOP_ISLOCKED(vp);
|
|
KASSERT(ltype == LK_EXCLUSIVE || ltype == LK_SHARED,
|
|
("vn_vget_ino: vp not locked"));
|
|
error = vfs_busy(mp, MBF_NOWAIT);
|
|
if (error != 0) {
|
|
vfs_ref(mp);
|
|
VOP_UNLOCK(vp, 0);
|
|
error = vfs_busy(mp, 0);
|
|
vn_lock(vp, ltype | LK_RETRY);
|
|
vfs_rel(mp);
|
|
if (error != 0)
|
|
return (ENOENT);
|
|
if (vp->v_iflag & VI_DOOMED) {
|
|
vfs_unbusy(mp);
|
|
return (ENOENT);
|
|
}
|
|
}
|
|
VOP_UNLOCK(vp, 0);
|
|
error = VFS_VGET(mp, ino, lkflags, rvp);
|
|
vfs_unbusy(mp);
|
|
vn_lock(vp, ltype | LK_RETRY);
|
|
if (vp->v_iflag & VI_DOOMED) {
|
|
if (error == 0)
|
|
vput(*rvp);
|
|
error = ENOENT;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
vn_rlimit_fsize(const struct vnode *vp, const struct uio *uio,
|
|
const struct thread *td)
|
|
{
|
|
|
|
if (vp->v_type != VREG || td == NULL)
|
|
return (0);
|
|
PROC_LOCK(td->td_proc);
|
|
if ((uoff_t)uio->uio_offset + uio->uio_resid >
|
|
lim_cur(td->td_proc, RLIMIT_FSIZE)) {
|
|
kern_psignal(td->td_proc, SIGXFSZ);
|
|
PROC_UNLOCK(td->td_proc);
|
|
return (EFBIG);
|
|
}
|
|
PROC_UNLOCK(td->td_proc);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vn_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
struct vnode *vp;
|
|
int error, vfslocked;
|
|
|
|
vp = fp->f_vnode;
|
|
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
|
|
#ifdef AUDIT
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
AUDIT_ARG_VNODE1(vp);
|
|
VOP_UNLOCK(vp, 0);
|
|
#endif
|
|
error = setfmode(td, active_cred, vp, mode);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
vn_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
struct vnode *vp;
|
|
int error, vfslocked;
|
|
|
|
vp = fp->f_vnode;
|
|
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
|
|
#ifdef AUDIT
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
AUDIT_ARG_VNODE1(vp);
|
|
VOP_UNLOCK(vp, 0);
|
|
#endif
|
|
error = setfown(td, active_cred, vp, uid, gid);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
vn_pages_remove(struct vnode *vp, vm_pindex_t start, vm_pindex_t end)
|
|
{
|
|
vm_object_t object;
|
|
|
|
if ((object = vp->v_object) == NULL)
|
|
return;
|
|
VM_OBJECT_LOCK(object);
|
|
vm_object_page_remove(object, start, end, 0);
|
|
VM_OBJECT_UNLOCK(object);
|
|
}
|