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px4-firmware/nuttx/fs/nfs/nfs_vfsops.c

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/****************************************************************************
* fs/nfs/nfs_vfsops.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Copyright (C) 2012 Jose Pablo Rojas Vargas. All rights reserved.
* Author: Jose Pablo Rojas Vargas <jrojas@nx-engineering.com>
*
* Leveraged from OpenBSD:
*
* Copyright (c) 1989, 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* 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.
* 3. 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/statfs>
#include <queue.h>
#include <nuttx/fs/dirent.h>
#include <nuttx/fs/fs.h>
#include <net/if.h>
#include <netinet/in.h>
#include "rpcv2.h"
#include "nfsproto.h"
#include "nfs_node.h"
#include "nfs.h"
#include "nfs_mount.h"
#include "xdr_subs.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define NFS_DIRHDSIZ (sizeof (struct nfs_dirent) - (MAXNAMLEN + 1))
#define NFS_DIRENT_OVERHEAD offsetof(struct nfs_dirent, dirent)
/****************************************************************************
* Private Type Definitions
****************************************************************************/
struct nfs_dirent
{
uint32_t cookie[2];
struct dirent dirent;
};
/****************************************************************************
* External Public Data (this belong in a header file)
****************************************************************************/
extern uint32_t nfs_true, nfs_false;
extern uint32_t nfs_xdrneg1;
extern nfstype nfsv3_type[8];
extern struct nfsstats nfsstats;
extern int nfs_ticks;
extern uint32_t nfs_procids[NFS_NPROCS];
/****************************************************************************
* Public Data
****************************************************************************/
int nfs_numasync = 0;
/* nfs vfs operations. */
const struct mountpt_operations nfs_ops = {
nfs_open, /* open */
nfs_close, /* close */
nfs_read, /* read */
nfs_write, /* write */
NULL, /* seek */
nfs_ioctl, /* ioctl */
nfs_sync, /* sync */
NULL, /* opendir */
NULL, /* closedir */
nfs_readdir, /* readdir */
NULL, /* rewinddir */
nfs_mount, /* bind */
nfs_unmount, /* unbind */
nfs_statfs, /* statfs */
nfs_remove, /* unlink */
nfs_mkdir, /* mkdir */
nfs_rmdir, /* rmdir */
nfs_rename, /* rename */
NULL /* stat */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/* nfs open struct file
* Check to see if the type is ok
* and that deletion is not in progress.
* For paged in text files, you will need to flush the page cache
* if consistency is lost.
*/
int
nfs_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode)
{
struct inode *in = filep->f_inode;
struct nfsmount *nmp = VFSTONFS(in);
struct nfsnode *np = VTONFS(filep);
int error;
/* Sanity checks */
DEBUGASSERT(filep->f_priv == NULL && filep->f_inode != NULL);
if (np->nfsv3_type != NFREG && np->nfsv3_type != NFDIR)
{
fdbg("open eacces typ=%d\n", np->nfsv3_type);
return (EACCES);
}
NFS_INVALIDATE_ATTRCACHE(np);
if (np->nfsv3_type == NFDIR)
np->n_direofoffset = 0;
np->n_mtime = vattr.va_mtime
/* For open/close consistency. */
NFS_INVALIDATE_ATTRCACHE(np);
return (0);
}
#if 0
int
nfs_create(FAR struct file *filp, FAR const char *relpath,
int oflags, mode_t mode)
{
// struct vop_create_args *ap = v;
struct inode *in = filp->f_inode;
// struct vattr *vap = ap->a_vap;
// struct componentname *cnp = ap->a_cnp;
struct nfsv3_sattr *sp;
// struct nfsm_info info;
uint32_t *tl;
int32_t t1;
struct nfsnode *np = NULL;
struct inode *newvp = NULL;
caddr_t cp2;
int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0;
/* Oops, not for me.. */
if (np->nfsv3_type == VSOCK)
{
fdbg("open eacces type=%d\n", np->nfsv3_type);
return (EACCES);
}
if (vap->va_vaflags & VA_EXCLUSIVE)
fmode |= O_EXCL;
again:
nfsstats.rpccnt[NFSPROC_CREATE]++;
sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
sp->sa_uid = nfs_xdrneg1;
sp->sa_gid = nfs_xdrneg1;
sp->sa_size = 0;
txdr_nfsv3time(&vap->va_atime, &sp->sa_atime);
txdr_nfsv3time(&vap->va_mtime, &sp->sa_mtime);
error = nfs_request(in, NFSPROC_CREATE);
if (!error)
{
nfsm_mtofh(dvp, newvp, info_v3, gotvp);
if (!gotvp)
{
if (newvp)
{
vrele(newvp);
newvp = NULL;
}
}
}
if (info_v3)
nfsm_wcc_data(dvp, wccflag);
nfsmout:
if (error)
{
if (info_v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP)
{
fmode &= ~O_EXCL;
goto again;
}
if (newvp)
vrele(newvp);
}
else if (info_v3 && (fmode & O_EXCL))
error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_proc);
if (!error)
{
if (cnp->cn_flags & MAKEENTRY)
nfs_cache_enter(dvp, newvp, cnp);
*ap->a_vpp = newvp;
}
pool_put(&namei_pool, cnp->cn_pnbuf);
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
vrele(dvp);
return (error);
}
#endif
/* nfs close vnode op
* What an NFS client should do upon close after writing is a debatable issue.
* Most NFS clients push delayed writes to the server upon close, basically for
* two reasons:
* 1 - So that any write errors may be reported back to the client process
* doing the close system call. By far the two most likely errors are
* NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
* 2 - To put a worst case upper bound on cache inconsistency between
* multiple clients for the file.
* There is also a consistency problem for Version 2 of the protocol w.r.t.
* not being able to tell if other clients are writing a file concurrently,
* since there is no way of knowing if the changed modify time in the reply
* is only due to the write for this client.
* (NFS Version 3 provides weak cache consistency data in the reply that
* should be sufficient to detect and handle this case.)
*
* The current code does the following:
* for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
* for NFS Version 3 - flush dirty buffers to the server but don't invalidate
* or commit them (this satisfies 1 and 2 except for the
* case where the server crashes after this close but
* before the commit RPC, which is felt to be "good
* enough". Changing the last argument to nfs_flush() to
* a 1 would force a commit operation, if it is felt a
* commit is necessary now.
*/
int nfs_close(FAR struct file *filep)
{
struct inode *in = filep->f_inode;
struct nfsmount *nmp = VFSTONFS(in);
struct nfsnode *np = VTONFS(filep);
int error = 0;
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
DEBUGASSERT(nmp != NULL);
if (np->nfsv3_type == NFREG)
{
error = nfs_sync(filep);
kfree(np);
filep->f_priv = NULL;
}
return (error);
}
/* nfs read call.
* Just call nfs_bioread() to do the work.
*/
int nfs_read(void *v)
{
struct vop_read_args *ap = v;
struct vnode *vp = ap->a_vp;
if (vp->v_type != VREG)
return (EPERM);
return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
}
/* nfs write call */
int
nfs_writerpc(struct vnode *vp, struct uio *uiop, int *iomode, int *must_commit)
{
struct nfsm_info info;
u_int32_t *tl;
int32_t t1, backup;
caddr_t cp2;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit;
int committed = NFSV3WRITE_FILESYNC;
info.nmi_v3 = NFS_ISV3(vp);
#ifdef DIAGNOSTIC
if (uiop->uio_iovcnt != 1)
panic("nfs: writerpc iovcnt > 1");
#endif
*must_commit = 0;
tsiz = uiop->uio_resid;
if (uiop->uio_offset + tsiz > 0xffffffff && !info.nmi_v3)
return (EFBIG);
while (tsiz > 0)
{
nfsstats.rpccnt[NFSPROC_WRITE]++;
len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3)
+ 5 * NFSX_UNSIGNED +
nfsm_rndup(len));
nfsm_fhtom(&info, vp, info.nmi_v3);
if (info.nmi_v3)
{
tl = nfsm_build(&info.nmi_mb, 5 * NFSX_UNSIGNED);
txdr_hyper(uiop->uio_offset, tl);
tl += 2;
*tl++ = txdr_unsigned(len);
*tl++ = txdr_unsigned(*iomode);
*tl = txdr_unsigned(len);
}
else
{
u_int32_t x;
tl = nfsm_build(&info.nmi_mb, 4 * NFSX_UNSIGNED);
/* Set both "begin" and "current" to non-garbage. */
x = txdr_unsigned((u_int32_t) uiop->uio_offset);
*tl++ = x; /* "begin offset" */
*tl++ = x; /* "current offset" */
x = txdr_unsigned(len);
*tl++ = x; /* total to this offset */
*tl = x; /* size of this write */
}
nfsm_uiotombuf(&info.nmi_mb, uiop, len);
info.nmi_procp = curproc;
info.nmi_cred = VTONFS(vp)->n_wcred;
error = nfs_request(vp, NFSPROC_WRITE, &info);
if (info.nmi_v3)
{
wccflag = NFSV3_WCCCHK;
nfsm_wcc_data(vp, wccflag);
}
if (error)
{
m_freem(info.nmi_mrep);
goto nfsmout;
}
if (info.nmi_v3)
{
wccflag = NFSV3_WCCCHK;
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED + NFSX_V3WRITEVERF);
rlen = fxdr_unsigned(int, *tl++);
if (rlen == 0)
{
error = NFSERR_IO;
break;
}
else if (rlen < len)
{
backup = len - rlen;
uiop->uio_iov->iov_base =
(char *)uiop->uio_iov->iov_base - backup;
uiop->uio_iov->iov_len += backup;
uiop->uio_offset -= backup;
uiop->uio_resid += backup;
len = rlen;
}
commit = fxdr_unsigned(int, *tl++);
/* Return the lowest committment level
* obtained by any of the RPCs.
*/
if (committed == NFSV3WRITE_FILESYNC)
committed = commit;
else if (committed == NFSV3WRITE_DATASYNC &&
commit == NFSV3WRITE_UNSTABLE)
committed = commit;
if ((nmp->nm_flag & NFSMNT_HASWRITEVERF) == 0)
{
bcopy((caddr_t) tl, (caddr_t) nmp->nm_verf, NFSX_V3WRITEVERF);
nmp->nm_flag |= NFSMNT_HASWRITEVERF;
}
else if (bcmp((caddr_t) tl, (caddr_t) nmp->nm_verf, NFSX_V3WRITEVERF))
{
*must_commit = 1;
bcopy((caddr_t) tl, (caddr_t) nmp->nm_verf, NFSX_V3WRITEVERF);
}
}
else
{
nfsm_loadattr(vp, NULL);
}
if (wccflag)
VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime;
m_freem(info.nmi_mrep);
tsiz -= len;
}
nfsmout:
*iomode = committed;
if (error)
uiop->uio_resid = tsiz;
return (error);
}
/* nfs file remove call
* To try and make nfs semantics closer to ufs semantics, a file that has
* other processes using the vnode is renamed instead of removed and then
* removed later on the last close.
* - If v_usecount > 1
* If a rename is not already in the works
* call nfs_sillyrename() to set it up
* else
* do the remove rpc
*/
int nfs_remove(void *v)
{
struct vop_remove_args *ap = v;
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
struct nfsnode *np = VTONFS(vp);
int error = 0;
struct vattr vattr;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("nfs_remove: no name");
if (vp->v_usecount < 1)
panic("nfs_remove: bad v_usecount");
#endif
if (vp->v_type == VDIR)
error = EPERM;
else if (vp->v_usecount == 1 || (np->n_sillyrename &&
VOP_GETATTR(vp, &vattr, cnp->cn_cred,
cnp->cn_proc) == 0 &&
vattr.va_nlink > 1))
{
/* Purge the name cache so that the chance of a lookup for
* the name succeeding while the remove is in progress is
* minimized. Without node locking it can still happen, such
* that an I/O op returns ESTALE, but since you get this if
* another host removes the file..
*/
cache_purge(vp);
/* throw away biocache buffers, mainly to avoid
* unnecessary delayed writes later.
*/
error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, cnp->cn_proc);
/* Do the rpc */
if (error != EINTR)
error = nfs_removerpc(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc);
/* Kludge City: If the first reply to the remove rpc is lost..
* the reply to the retransmitted request will be ENOENT
* since the file was in fact removed
* Therefore, we cheat and return success.
*/
if (error == ENOENT)
error = 0;
}
else if (!np->n_sillyrename)
error = nfs_sillyrename(dvp, vp, cnp);
pool_put(&namei_pool, cnp->cn_pnbuf);
NFS_INVALIDATE_ATTRCACHE(np);
vrele(dvp);
vrele(vp);
VN_KNOTE(vp, NOTE_DELETE);
VN_KNOTE(dvp, NOTE_WRITE);
return (error);
}
/* Nfs remove rpc, called from nfs_remove() and nfs_removeit(). */
int
nfs_removerpc(struct vnode *dvp, char *name, int namelen, struct ucred *cred,
struct proc *proc)
{
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
caddr_t cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
info.nmi_v3 = NFS_ISV3(dvp);
nfsstats.rpccnt[NFSPROC_REMOVE]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
NFSX_UNSIGNED +
nfsm_rndup(namelen));
nfsm_fhtom(&info, dvp, info.nmi_v3);
nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
error = nfs_request(dvp, NFSPROC_REMOVE, &info);
if (info.nmi_v3)
nfsm_wcc_data(dvp, wccflag);
nfsmout:
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
return (error);
}
/* nfs file rename call */
int nfs_rename(void *v)
{
struct vop_rename_args *ap = v;
struct vnode *fvp = ap->a_fvp;
struct vnode *tvp = ap->a_tvp;
struct vnode *fdvp = ap->a_fdvp;
struct vnode *tdvp = ap->a_tdvp;
struct componentname *tcnp = ap->a_tcnp;
struct componentname *fcnp = ap->a_fcnp;
int error;
#ifdef DIAGNOSTIC
if ((tcnp->cn_flags & HASBUF) == 0 || (fcnp->cn_flags & HASBUF) == 0)
panic("nfs_rename: no name");
#endif
/* Check for cross-device rename */
if ((fvp->v_mount != tdvp->v_mount) ||
(tvp && (fvp->v_mount != tvp->v_mount)))
{
error = EXDEV;
goto out;
}
/* If the tvp exists and is in use, sillyrename it before doing the
* rename of the new file over it.
*/
if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename &&
tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp))
{
VN_KNOTE(tvp, NOTE_DELETE);
vrele(tvp);
tvp = NULL;
}
error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
tcnp->cn_proc);
VN_KNOTE(fdvp, NOTE_WRITE);
VN_KNOTE(tdvp, NOTE_WRITE);
if (fvp->v_type == VDIR)
{
if (tvp != NULL && tvp->v_type == VDIR)
cache_purge(tdvp);
cache_purge(fdvp);
}
out:
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
vrele(fdvp);
vrele(fvp);
/* Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. */
if (error == ENOENT)
error = 0;
return (error);
}
/* nfs file rename rpc called from nfs_remove() above */
int
nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
struct sillyrename *sp)
{
return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen,
sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred,
curproc));
}
/* Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). */
int
nfs_renamerpc(struct vnode *fdvp, char *fnameptr, int fnamelen,
struct vnode *tdvp, char *tnameptr, int tnamelen)
{
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
caddr_t cp2;
int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;
info.nmi_v3 = NFS_ISV3(fdvp);
nfsstats.rpccnt[NFSPROC_RENAME]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead((NFSX_FH(info.nmi_v3) +
NFSX_UNSIGNED) * 2 +
nfsm_rndup(fnamelen) +
nfsm_rndup(tnamelen));
nfsm_fhtom(&info, fdvp, info.nmi_v3);
nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN);
nfsm_fhtom(&info, tdvp, info.nmi_v3);
nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN);
error = nfs_request(fdvp, NFSPROC_RENAME, &info);
if (info.nmi_v3)
{
nfsm_wcc_data(fdvp, fwccflag);
nfsm_wcc_data(tdvp, twccflag);
}
nfsmout:
VTONFS(fdvp)->n_flag |= NMODIFIED;
VTONFS(tdvp)->n_flag |= NMODIFIED;
if (!fwccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(fdvp));
if (!twccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(tdvp));
return (error);
}
/* nfs make dir call */
int nfs_mkdir(struct inode *mountpt, const char *relpath, mode_t mode)
{
struct vnode *dvp = ap->a_dvp;
struct nfsv3_sattr *vap;
struct nfsmount *nmp;
struct nfsnode *np;
struct componentname *cnp = ap->a_cnp;
struct nfsv3_sattr *sp;
int info_v3;
//struct nfsm_info info;
//u_int32_t *tl;
//int32_t t1;
int len;
struct nfsnode *np = NULL;
struct file *newfilep = NULL;
//caddr_t cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
int gotvp = 0;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
nmp = mountpt->i_private;
np = nmp->nm_head;
vap = np->n_fattr;
info_v3 = (nmp->nm_flag & NFSMNT_NFSV3);
/* Check if the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != 0)
{
goto errout_with_semaphore;
}
nfsstats.rpccnt[NFSPROC_MKDIR]++;
sp->sa_modetrue = nfs_true;
sp->sa_mode = txdr_unsigned(vap->sa_mode);
sp->sa_uid = nfs_xdrneg1;
sp->sa_gid = nfs_xdrneg1;
sp->sa_size = nfs_xdrneg1;
sp->sa_atimetype = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
sp->sa_mtimetype = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
txdr_nfsv3time(&vap->sa_atime, &sp->sa_atime);
txdr_nfsv3time(&vap->sa_mtime, &sp->sa_mtime);
error = nfs_request(nmp, NFSPROC_MKDIR, &info);
if (!error)
nfsm_mtofh(dvp, newvp, info.nmi_v3, gotvp);
if (info.nmi_v3)
nfsm_wcc_data(dvp, wccflag);
nfsmout:
nmp->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
if (error)
{
if (newvp)
vrele(newvp);
}
else
{
VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
if (cnp->cn_flags & MAKEENTRY)
nfs_cache_enter(dvp, newvp, cnp);
*ap->a_vpp = newvp;
}
pool_put(&namei_pool, cnp->cn_pnbuf);
vrele(dvp);
return (error);
errout_with_semaphore:
nfs_semgive(nmp);
return error;
}
/* nfs remove directory call */
int nfs_rmdir(void *v)
{
struct vop_rmdir_args *ap = v;
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
caddr_t cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
info.nmi_v3 = NFS_ISV3(dvp);
if (dvp == vp)
{
vrele(dvp);
vrele(dvp);
pool_put(&namei_pool, cnp->cn_pnbuf);
return (EINVAL);
}
nfsstats.rpccnt[NFSPROC_RMDIR]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
NFSX_UNSIGNED +
nfsm_rndup(cnp->cn_namelen));
nfsm_fhtom(&info, dvp, info.nmi_v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
info.nmi_procp = cnp->cn_proc;
info.nmi_cred = cnp->cn_cred;
error = nfs_request(dvp, NFSPROC_RMDIR, &info);
if (info.nmi_v3)
nfsm_wcc_data(dvp, wccflag);
m_freem(info.nmi_mrep);
nfsmout:
pool_put(&namei_pool, cnp->cn_pnbuf);
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
VN_KNOTE(vp, NOTE_DELETE);
cache_purge(vp);
vrele(vp);
vrele(dvp);
/* Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. */
if (error == ENOENT)
error = 0;
return (error);
}
/* The readdir logic below has a big design bug. It stores the NFS cookie in
* the returned uio->uio_offset but does not store the verifier (it cannot).
* Instead, the code stores the verifier in the nfsnode and applies that
* verifies to all cookies, no matter what verifier was originally with
* the cookie.
*
* From a practical standpoint, this is not a problem since almost all
* NFS servers do not change the validity of cookies across deletes
* and inserts.
*/
/* nfs readdir call */
int nfs_readdir(struct inode *mountpt, struct fs_dirent_s *dir)
{
//struct nfsnode *np = VTONFS(vp);
int error = 0;
unsigned long *cookies = NULL;
int cnt;
struct nfsmount *nmp;
struct nfsnode *np;
int eof = 0;
//struct nfs_dirent *ndp;
fvdbg("Entry\n");
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Recover our private data from the inode instance */
nmp = mountpt->i_private;
np = np->nm_head;
/* Make sure that the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != 0)
{
fdbg("romfs_checkmount failed: %d\n", error);
goto errout_with_semaphore;
}
if (np->nfsv3_type != NFDIR)
{
error = EPERM;
goto errout_with_semaphore;
}
dir->u.nfs.nd_direoffset = np->nd_direoffset;
/* First, check for hit on the EOF offset */
if (dir->u.nfs.nd_direoffset != 0)
{
nfsstats.direofcache_hits++;
//np->n_open = true;
return (0);
}
if ((nmp->nm_flag & (NFSMNT_NFSV3 | NFSMNT_GOTFSINFO)) == NFSMNT_NFSV3)
{
(void)nfs_fsinfo(nmp);
}
cnt = 5;
do
{
error = nfs_readdirrpc(nmp, &eof, dir);
if (error == NFSERR_BAD_COOKIE)
error = EINVAL;
}
while (!error && !eof && cnt--);
if (!error && eof)
{
nfsstats.direofcache_misses++;
nfs_semgive(nmp);
return (0);
}
errout_with_semaphore:
nfs_semgive(nmp);
return (error);
}
/* The function below stuff the cookies in after the name */
/* Readdir rpc call. */
int nfs_readdirrpc(struct nfsmount *nmp, int *end_of_directory, fs_dirent_s *dir)
{
int len, left;
struct nfs_dirent *dp = NULL;
//struct nfsm_info info;
//uint32_t *tl;
/*caddr_t cp;
int32_t t1;
caddr_t cp2;*/
nfsuint64 cookie;
struct nfsnode *dnp = nmp->nm_head;
int error = 0, more_dirs = 1, blksiz = 0, bigenough = 1;
int attrflag;
int info_v3;
void *datareply;
info_v3 = (nmp->nm_flag & NFSMNT_NFSV3);
/* Loop around doing readdir rpc's of size nm_readdirsize
* truncated to a multiple of NFS_READDIRBLKSIZ.
* The stopping criteria is EOF or buffer full.
*/
while (more_dirs && bigenough)
{
nfsstats.rpccnt[NFSPROC_READDIR]++;
if (info_v3)
{
cookie.nfsuquad[0] = dnp->n_cookieverf.nfsuquad[0];
cookie.nfsuquad[1] = dnp->n_cookieverf.nfsuquad[1];
}
else
{
cookie.nfsuquad[1] = dnp->n_cookieverf.nfsuquad[1];
}
error = nfs_request(nmp, NFSPROC_READDIR, datareply);
dp = (void nfs_dirent*) datareply;
if (error)
{
goto nfsmout;
}
if (info_v3)
{
dnp->n_cookieverf.nfsuquad[0] = dp->cookie[0];
dnp->n_cookieverf.nfsuquad[1] = dp->cookie[1];
}
more_dirs = fxdr_unsigned(int, *dp);
/* loop thru the dir entries, doctoring them to 4bsd form */
while (more_dirs && bigenough)
{
if (bigenough)
{
if (info_v3)
{
dir->u.nfs.cookie[0] = cookie.nfsuquad[0] = *tl++;
}
else
{
dir->u.nfs.cookie[0] = ndp->cookie[0] = 0;
}
dir->u.nfs.cookie[1] = ndp->cookie[1] = cookie.nfsuquad[1] = *tl++;
}
else if (info_v3)
{
tl += 2;
}
else
{
tl++;
}
more_dirs = fxdr_unsigned(int, *tl);
}
/* If at end of rpc data, get the eof boolean */
if (!more_dirs)
{
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
more_dirs = (fxdr_unsigned(int, *tl) == 0);
}
}
/* We are now either at the end of the directory or have filled the
* block.
*/
if (bigenough)
{
dnp->n_direofoffset = fxdr_hyper(&cookie.nfsuquad[0]);
if (end_of_directory)
{
*end_of_directory = 1;
}
/* We signal the end of the directory by returning the
* special error -ENOENT
*/
fdbg("End of directory\n");
error = ENOENT;
}
nfsmout:
return (error);
}
/****************************************************************************
* Name: nfs_statfs
*
* Description: Return filesystem statistics
*
****************************************************************************/
int nfs_statfs(struct inode *mountpt, struct statfs *sbp)
{
struct nfs_statfs *sfp = NULL;
struct nfsmount *nmp;
int error = 0;
uint64_t tquad;
void *datareply;
int info_v3;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
nmp = mountpt->i_private;
info_v3 = (nmp->nm_flag & NFSMNT_NFSV3);
/* Check if the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error < 0)
{
fdbg("romfs_checkmount failed: %d\n", error);
goto errout_with_semaphore;
}
/* Fill in the statfs info */
memset(sbp, 0, sizeof(struct statfs));
sbp->f_type = NFS_SUPER_MAGIC;
if (info_v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0)
(void)nfs_fsinfo(nmp);
nfsstats.rpccnt[NFSPROC_FSSTAT]++;
error = nfs_request(nmp, NFSPROC_FSSTAT, datareply);
if (error)
goto errout_with_semaphore;
sfp = (struct nfs_statfs *)datareply;
if (info_v3)
{
sbp->f_bsize = NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_tbytes);
sbp->f_blocks = tquad / (uint64_t) NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_fbytes);
sbp->f_bfree = tquad / (uint64_t) NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_abytes);
sbp->f_bavail = (quad_t) tquad / (quad_t) NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_tfiles);
sbp->f_files = tquad;
tquad = fxdr_hyper(&sfp->sf_ffiles);
sbp->f_ffree = tquad;
sbp->f_namelen = MAXNAMLEN;
}
else
{
sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
sbp->f_files = 0;
sbp->f_ffree = 0;
}
errout_with_semaphore:
nfs_semgive(nmp);
return (error);
}
/* Print out the contents of an nfsnode. */
int nfs_print(struct file *filep)
{
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
printf("tag VT_NFS, fileid %ld fsid 0x%lx",
np->n_fattr.nfsv3fa_fileid, np->n_fattr.nfsv3fa_fsid);
printf("\n");
return (0);
}
/* nfs version 3 fsinfo rpc call */
int nfs_fsinfo(struct nfsmount *nmp)
{
struct nfsv3_fsinfo *fsp;
uint32_t pref, max;
int error = 0;
void *datareply;
nfsstats.rpccnt[NFSPROC_FSINFO]++;
error = nfs_request(nmp, NFSPROC_FSINFO, datareply);
if (error)
{
goto nfsmout;
}
fsp = (struct nfsv3_fsinfo *)datareply;
pref = fxdr_unsigned(uint32_t, fsp->fs_wtpref);
if (pref < nmp->nm_wsize)
nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & ~(NFS_FABLKSIZE - 1);
max = fxdr_unsigned(uint32_t, fsp->fs_wtmax);
if (max < nmp->nm_wsize)
{
nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize == 0)
nmp->nm_wsize = max;
}
pref = fxdr_unsigned(uint32_t, fsp->fs_rtpref);
if (pref < nmp->nm_rsize)
nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & ~(NFS_FABLKSIZE - 1);
max = fxdr_unsigned(uint32_t, fsp->fs_rtmax);
if (max < nmp->nm_rsize)
{
nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize == 0)
nmp->nm_rsize = max;
}
pref = fxdr_unsigned(uint32_t, fsp->fs_dtpref);
if (pref < nmp->nm_readdirsize)
nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & ~(NFS_DIRBLKSIZ - 1);
if (max < nmp->nm_readdirsize)
{
nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1);
if (nmp->nm_readdirsize == 0)
nmp->nm_readdirsize = max;
}
nmp->nm_flag |= NFSMNT_GOTFSINFO;
nfsmout:
return (error);
}
void nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp)
{
int adjsock = 0;
int maxio;
#ifdef CONFIG_NFS_TCPIP
/* Re-bind if rsrvd port requested and wasn't on one */
adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
&& (argp->flags & NFSMNT_RESVPORT);
#endif
/* Also re-bind if we're switching to/from a connected UDP socket */
adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != (argp->flags & NFSMNT_NOCONN));
/* Update flags atomically. Don't change the lock bits. */
nmp->nm_flag =
(argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL);
if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0)
{
nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
if (nmp->nm_timeo < NFS_MINTIMEO)
nmp->nm_timeo = NFS_MINTIMEO;
else if (nmp->nm_timeo > NFS_MAXTIMEO)
nmp->nm_timeo = NFS_MAXTIMEO;
}
if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1)
nmp->nm_retry = MIN(argp->retrans, NFS_MAXREXMIT);
if (!(nmp->nm_flag & NFSMNT_SOFT))
nmp->nm_retry = NFS_MAXREXMIT + 1; /* past clip limit */
if (argp->flags & NFSMNT_NFSV3)
{
if (argp->sotype == SOCK_DGRAM)
maxio = NFS_MAXDGRAMDATA;
else
maxio = NFS_MAXDATA;
}
else
maxio = NFS_V2MAXDATA;
if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0)
{
int osize = nmp->nm_wsize;
nmp->nm_wsize = argp->wsize;
/* Round down to multiple of blocksize */
nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize <= 0)
nmp->nm_wsize = NFS_FABLKSIZE;
adjsock |= (nmp->nm_wsize != osize);
}
if (nmp->nm_wsize > maxio)
nmp->nm_wsize = maxio;
if (nmp->nm_wsize > MAXBSIZE)
nmp->nm_wsize = MAXBSIZE;
if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0)
{
int osize = nmp->nm_rsize;
nmp->nm_rsize = argp->rsize;
/* Round down to multiple of blocksize */
nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize <= 0)
nmp->nm_rsize = NFS_FABLKSIZE;
adjsock |= (nmp->nm_rsize != osize);
}
if (nmp->nm_rsize > maxio)
nmp->nm_rsize = maxio;
if (nmp->nm_rsize > MAXBSIZE)
nmp->nm_rsize = MAXBSIZE;
if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0)
{
nmp->nm_readdirsize = argp->readdirsize;
/* Round down to multiple of blocksize */
nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1);
if (nmp->nm_readdirsize < NFS_DIRBLKSIZ)
nmp->nm_readdirsize = NFS_DIRBLKSIZ;
}
else if (argp->flags & NFSMNT_RSIZE)
nmp->nm_readdirsize = nmp->nm_rsize;
if (nmp->nm_readdirsize > maxio)
nmp->nm_readdirsize = maxio;
if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 &&
argp->maxgrouplist <= NFS_MAXGRPS)
nmp->nm_numgrps = argp->maxgrouplist;
if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 &&
argp->readahead <= NFS_MAXRAHEAD)
nmp->nm_readahead = argp->readahead;
if (argp->flags & NFSMNT_ACREGMIN && argp->acregmin >= 0)
{
if (argp->acregmin > 0xffff)
nmp->nm_acregmin = 0xffff;
else
nmp->nm_acregmin = argp->acregmin;
}
if (argp->flags & NFSMNT_ACREGMAX && argp->acregmax >= 0)
{
if (argp->acregmax > 0xffff)
nmp->nm_acregmax = 0xffff;
else
nmp->nm_acregmax = argp->acregmax;
}
if (nmp->nm_acregmin > nmp->nm_acregmax)
nmp->nm_acregmin = nmp->nm_acregmax;
if (argp->flags & NFSMNT_ACDIRMIN && argp->acdirmin >= 0)
{
if (argp->acdirmin > 0xffff)
nmp->nm_acdirmin = 0xffff;
else
nmp->nm_acdirmin = argp->acdirmin;
}
if (argp->flags & NFSMNT_ACDIRMAX && argp->acdirmax >= 0)
{
if (argp->acdirmax > 0xffff)
nmp->nm_acdirmax = 0xffff;
else
nmp->nm_acdirmax = argp->acdirmax;
}
if (nmp->nm_acdirmin > nmp->nm_acdirmax)
nmp->nm_acdirmin = nmp->nm_acdirmax;
if (nmp->nm_so && adjsock)
{
nfs_disconnect(nmp);
if (nmp->nm_sotype == SOCK_DGRAM)
while (nfs_connect(nmp))
{
printf("nfs_args: retrying connect\n");
}
}
}
/****************************************************************************
* Name: nfs_mount
*
* Description: This implements a portion of the mount operation. This
* function allocates and initializes the mountpoint private data and
* binds the blockdriver inode to the filesystem private data. The final
* binding of the private data (containing the blockdriver) to the
* mountpoint is performed by mount().
*
****************************************************************************/
int nfs_mount(struct inode *blkdriver, const char *path, void *data, void **handle)
{
int error;
struct nfs_args args;
struct sockaddr *nam;
char pth[MNAMELEN];
nfsfh_t nfh[NFSX_V3FHMAX];
bcopy(data, &args, sizeof(args.version));
if (args.version == 3)
{
bcopy(data, &args, sizeof(struct nfs_args3));
args.flags &= ~(NFSMNT_INTERNAL | NFSMNT_NOAC);
}
else if (args.version == NFS_ARGSVERSION)
{
error = copyin(data, &args, sizeof(struct nfs_args));
args.flags &= ~NFSMNT_NOAC; /* XXX - compatibility */
}
else
return (EPROGMISMATCH);
if ((args.flags & (NFSMNT_NFSV3 | NFSMNT_RDIRPLUS)) == NFSMNT_RDIRPLUS)
return (EINVAL);
if (blkdriver->mnt_flag & MNT_UPDATE)
{
struct nfsmount *nmp = VFSTONFS(blkdriver);
if (nmp == NULL)
return (EIO);
/* When doing an update, we can't change from or to v3. */
args.flags = (args.flags & ~(NFSMNT_NFSV3)) |
(nmp->nm_flag & (NFSMNT_NFSV3));
nfs_decode_args(nmp, &args);
return (0);
}
if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX)
return (EINVAL);
bcopy(args.fh, nfh, args.fhsize);
memset(&pth[MNAMELEN], 0, sizeof(*pth[MNAMELEN]));
bcopy(path, pth, MNAMELEN - 1);
bcopy(args.addr, nam, sizeof(args.addr));
args.fh = nfh;
error = mountnfs(&args, blkdriver, nam);
return (error);
}
/* Common code for nfs_mount */
int mountnfs(struct nfs_args *argp, struct inode *blkdriver, struct sockaddr *nam, void **handle)
{
struct nfsmount *nmp;
int error;
if (blkdriver->mnt_flag & MNT_UPDATE)
{
nmp = VFSTONFS(blkdriver);
/* update paths, file handles, etc, here XXX */
return (0);
}
else
{
/* Open the block driver */
if (!blkdriver || !blkdriver->u.i_bops)
{
fdbg("No block driver/ops\n");
return -ENODEV;
}
if (blkdriver->u.i_bops->open &&
blkdriver->u.i_bops->open(blkdriver) != OK)
{
fdbg("No open method\n");
return -ENODEV;
}
/* Create an instance of the mountpt state structure */
nmp = (struct nfsmount *)zalloc(sizeof(struct nfmount));
if (!nmp)
{
fdbg("Failed to allocate mountpoint structure\n");
return -ENOMEM;
}
/* Initialize the allocated mountpt state structure. The filesystem is
* responsible for one reference ont the blkdriver inode and does not
* have to addref() here (but does have to release in ubind().
*/
sem_init(&rm->rm_sem, 0, 0); /* Initialize the semaphore that controls access */
//vfs_getnewfsid(mp);
nmp->nm_blkdriver = blkdriver; /* Save the block driver reference */
nmp->nm_timeo = NFS_TIMEO;
nmp->nm_retry = NFS_RETRANS;
nmp->nm_wsize = NFS_WSIZE;
nmp->nm_rsize = NFS_RSIZE;
nmp->nm_readdirsize = NFS_READDIRSIZE;
nmp->nm_numgrps = NFS_MAXGRPS;
nmp->nm_readahead = NFS_DEFRAHEAD;
nmp->nm_fhsize = argp->fhsize;
nmp->nm_acregmin = NFS_MINATTRTIMO;
nmp->nm_acregmax = NFS_MAXATTRTIMO;
nmp->nm_acdirmin = NFS_MINATTRTIMO;
nmp->nm_acdirmax = NFS_MAXATTRTIMO;
memmove(nmp->nm_fh, argp->fh, argp->fhsize);
//strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_vfc->vfc_name, MFSNAMELEN);
//memmove(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
//memmove(pth, mp->mnt_stat.f_mntonname, MNAMELEN);
//memmove(argp, &mp->mnt_stat.mount_info.nfs_args, sizeof(*argp));
nmp->nm_nam = nam;
nfs_decode_args(nmp, argp);
/* Set up the sockets and per-host congestion */
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
/* For Connection based sockets (TCP,...) defer the connect until
* the first request, in case the server is not responding.
*/
if (nmp->nm_sotype == SOCK_DGRAM && (error = nfs_connect(nmp)))
goto bad;
/* Mounted! */
nmp->nfs_mounted = true;
nfs_init();
*handle = mp->i_private = &nmp;
nfs_semgive(nmp);
return (0);
}
bad:
nfs_disconnect(nmp);
sem_destroy(&nmp->nm_sem);
kfree(nmp);
return (error);
}
/****************************************************************************
* Name: nfs_unmount
*
* Description: This implements the filesystem portion of the umount
* operation.
*
****************************************************************************/
int nfs_unmount(struct inode *blkdriver, void *handle)
{
struct nfsmount *nmp = (struct nfsmount*) handle ;
int error;
fvdbg("Entry\n");
if (!nmp)
{
return -EINVAL;
}
nfs_semtake(nmp)
if (nmp->nm_head)
{
/* We cannot unmount now.. there are open files */
error = -EBUSY;
}
else
{
/* Unmount ... close the block driver */
if (nmp->nm_blkdriver)
{
struct inode *inode = nmp->nm_blkdriver;
if (inode)
{
if (inode->u.i_bops && inode->u.i_bops->close)
{
(void)inode->u.i_bops->close(inode);
}
/* We hold a reference to the block driver but should
* not but mucking with inodes in this context. So, we will just return
* our contained reference to the block driver inode and let the umount
* logic dispose of it.
*/
if (blkdriver)
{
*blkdriver = inode;
}
}
}
/* Release the mountpoint private data */
if (nmp->nm_buffer)
{
kfree(nmp->nm_buffer);
}
nfs_disconnect(nmp);
sem_destroy(&rm->rm_sem);
kfree(nmp);
return (0);
}
nfs_semgive(nmp)
return (0);
}
/* Flush out the buffer cache */
int nfs_sync(struct file *filep) //falta
{
struct inode *inode;
struct nfsmount *nmp;
struct nfsnode *np;
int error, allerror = 0;
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover our private data from the struct file instance */
np = filep->f_priv;
inode = filep->f_inode;
nmp = inode->i_private;
DEBUGASSERT(nmp != NULL);
/* Force stale buffer cache information to be flushed. */
loop:
LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes)
{
/* If the vnode that we are about to sync is no longer
* associated with this mount point, start over.
*/
if (in->nm_blkdriver != mp)
goto loop;
if (VOP_ISLOCKED(vp) || LIST_FIRST(&vp->v_dirtyblkhd) == NULL)
continue;
if (vget(vp, LK_EXCLUSIVE, p))
goto loop;
error = VOP_FSYNC(vp, cred, waitfor, p);
if (error)
allerror = error;
vput(vp);
}
return (allerror);
}
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