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px4_autopilot/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 <assert.h>
#include <errno.h>
#include <debug.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 */
NULL, /* 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 create struct file
* if oflags == O_CREAT it creates a file, if not it
* check to see if the type is ok
* and that deletion is not in progress.
*/
int
nfs_open(FAR struct file *filp, FAR const char *relpath, // done but check variable how
int oflags, mode_t mode)
{
struct inode *in;
struct nfs_fattr *vap;
struct nfsv3_sattr *sp;
struct nfsmount *nmp;
struct nfsnode *np;
struct CREATE3args *create;
struct CREATE3resok *resok;
void *replydata;
int error = 0;
/* Sanity checks */
DEBUGASSERT(filep->f_inode != NULL);
/* Get the mountpoint inode reference from the file structure and the
* mountpoint private data from the inode structure
*/
in = filep->f_inode;
nmp = (struct nfsmount*)in->i_private;
np = (struct nfsnode*)filep->f_priv;
DEBUGASSERT(nmp != NULL);
/* Check if the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != 0)
{
goto errout_with_semaphore;
}
if (oflags == O_CREAT)
{
/* Sanity checks */
DEBUGASSERT(filep->f_priv == NULL);
again:
nfsstats.rpccnt[NFSPROC_CREATE]++;
vap = nmp->nm_head->n_fattr;
sp->sa_modetrue = nfs_true;
sp->sa_mode = txdr_unsigned(vap->fa_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->fa_atime, &sp->sa_atime);
txdr_nfsv3time(&vap->fa_mtime, &sp->sa_mtime);
create->how = sp;
create->where->dir= nmp->nm_fh;
create->where->name = relpath;
error = nfs_request(in, NFSPROC_CREATE, (void *) create, replydata);
if (!error)
{
/* Create an instance of the file private data to describe the opened
* file.
*/
np = (struct nfsnode *)zalloc(sizeof(struct nfsnode));
if (!np)
{
fdbg("Failed to allocate private data\n", error);
error = -ENOMEM;
goto errout_with_semaphore;
}
/* Initialize the file private data (only need to initialize
* non-zero elements)
*/
resok = (struct CREATE3resok *) replydata;
np->n_open = true;
np->nfsv3_type = NFREG;
np->n_size = (struct uint64_t *)resok->attributes->nfsv3fa_size;
np->n_fattr = resok->attributes;
np->n_mtime = (struct timespec*) resok->attributes->nfsv3fa_mtime
np->n_ctime = (struct time_t*) resok->attributes->nfsv3fa_ctime
/* Attach the private date to the struct file instance */
filep->f_priv = np;
/* Then insert the new instance into the mountpoint structure.
* It needs to be there (1) to handle error conditions that effect
* all files, and (2) to inform the umount logic that we are busy
* (but a simple reference count could have done that).
*/
np->n_next = nmp->nm_head;
nmp->nm_head = np->n_next;
error = 0;
}
else
{
if (info_v3 && error == NFSERR_NOTSUPP)
{
goto again;
}
}
np->n_flag |= NMODIFIED;
}
else
{
if (np->nfsv3_type != NFREG && np->nfsv3_type != NFDIR)
{
fdbg("open eacces typ=%d\n", np->nfsv3_type);
return EACCES;
}
if (np->n_flag & NMODIFIED)
{
if (np->nfsv3_type == NFDIR)
{
np->n_direofoffset = 0;
}
}
}
/* For open/close consistency. */
NFS_INVALIDATE_ATTRCACHE(np);
errout_with_semaphore:
nfs_semgive(nmp);
return error;
}
/****************************************************************************
* Name: nfs_close
****************************************************************************/
int nfs_close(FAR struct file *filep) //done
{
struct nfsmount *nmp;
struct nfsnode *np;
int error = 0;
fvdbg("Closing\n");
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover our private data from the struct file instance */
np = filep->f_priv;
nmp = filep->f_inode->i_private;
DEBUGASSERT(nmp != NULL);
if (np->nfsv3_type == NFREG)
{
error = nfs_sync(filep);
kfree(np);
filep->f_priv = NULL;
}
return error;
}
/****************************************************************************
* Name: nfs_read
****************************************************************************/
static ssize_t nfs_read(FAR struct file *filep, char *buffer, size_t buflen) //done
{
struct nfsmount *nmp;
struct nfsnode *np;
unsigned int readsize;
int bytesleft;
uint64_t offset;
void *datareply;
struct READ3args *read;
struct READ3resok *resok;
uint8_t *userbuffer = (uint8_t*)buffer;
int info_v3;
int error = 0;
int len;
bool eof;
fvdbg("Read %d bytes from offset %d\n", buflen, filep->f_pos);
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover our private data from the struct file instance */
np = (struct nfsnode*) filep->f_priv;
nmp = (struct nfsmount*) filep->f_inode->i_private;
eof = false;
offset = 0;
DEBUGASSERT(nmp != NULL);
/* Make sure that the mount is still healthy */
nfafs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != 0)
{
fdbg("nfs_checkmount failed: %d\n", error);
goto errout_with_semaphore;
}
if (np->nfsv3_type != NFREG)
{
fdbg("read eacces typ=%d\n", np->nfsv3_type);
return EACCES;
}
if ((nmp->nm_flag & (NFSMNT_NFSV3 | NFSMNT_GOTFSINFO)) == NFSMNT_NFSV3)
{
(void)nfs_fsinfo(nmp);
}
/* Get the number of bytes left in the file */
bytesleft = np->n_size - filep->f_pos;
readsize = 0;
/* Truncate read count so that it does not exceed the number
* of bytes left in the file.
*/
if (buflen > bytesleft)
{
buflen = bytesleft;
}
len = nmp->nm_rsize;
if (len < buflen)
{
error = EFBIG
goto errout_with_semaphore;
}
nfsstats.rpccnt[NFSPROC_READ]++;
again:
read->file = np->nfsv3_type;
read->count = buflen;
read->offset = offset;
error = nfs_request(nmp, NFSPROC_READ, read, datareply);
if (error)
{
goto errout_with_semaphore;
}
resok = (struct READ3resok *) datareply;
eof = resok->eof;
if (eof == true)
{
readsize = resok->count;
np->n_fattr = resok->file_attributes;
memcpy(userbuffer, resok->data, (struct size_t)readsize);
}
else
{
goto again;
}
nfs_semgive(nmp);
return readsize;
errout_with_semaphore:
nfs_semgive(nmp);
return error;
}
/****************************************************************************
* Name: nfs_write
****************************************************************************/
static ssize_t
nfs_write(FAR struct file *filep, const char *buffer, size_t buflen) // done
{
/*struct nfsm_info info;
uint32_t *tl;
int32_t t1, backup;
caddr_t cp2;*/
struct inode *inode;
struct nfsmount *nmp;
struct nfsnode *np;
unsigned int writesize;
void *datareply;
struct WRITE3args *write;
struct WRITE3resok resok;
uint8_t *userbuffer = (uint8_t*)buffer;
int error = 0;
uint64_t offset;
int len;
struct stable_how commit;
int committed = NFSV3WRITE_FILESYNC;
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover our private data from the struct file instance */
np = (struct nfsnode *)filep->f_priv;
inode = filep->f_inode;
nmp = (struct nfsmount *)inode->i_private;
offset = 0;
DEBUGASSERT(nmp != NULL);
/* Make sure that the mount is still healthy */
nfs_semtake();
error = nfs_checkmount(nmp);
if (error != 0)
{
goto errout_with_semaphore;
}
/* Check if the file size would exceed the range of off_t */
if (np->n_size + buflen < np->n_size)
{
ret = -EFBIG;
goto errout_with_semaphore;
}
len = nmp->nm_wsize;
if (len < buflen)
{
error = -EFBIG
goto errout_with_semaphore;
}
writesize = 0;
nfsstats.rpccnt[NFSPROC_WRITE]++;
write->file = np->nfsv3_type;
write->offset = offset;
write->count = buflen;
write->stable = committed;
memcpy(write->data, userbuffer, buflen);
error = nfs_request(nmp, NFSPROC_WRITE, write, datareply);
if (error)
{
goto errout_with_semaphore;
}
resok = (struct WRITE3resok *)datareply;
writesize = resok->count;
if (writesize == 0)
{
error = -NFSERR_IO;
goto errout_with_semaphore;
}
commit = resok->committed;
np->n_fattr = resok->file_wcc->after;
/* 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((void) resok->verf, (void) nmp->nm_verf, NFSX_V3WRITEVERF);
nmp->nm_flag |= NFSMNT_HASWRITEVERF;
}
else if (strncmp((char) resok->verf, (char) nmp->nm_verf, NFSX_V3WRITEVERF))
{
bcopy((void) resok->verf, (void) nmp->nm_verf, NFSX_V3WRITEVERF);
}
np->n_mtime = np->n_fattr.nfsv3fa_mtime;
nfs_semgive(nmp);
return writesize;
errout_with_semaphore:
nfs_semgive(nmp);
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
*/
/****************************************************************************
* Name: nfs_remove
*
* Description: Remove a file
*
****************************************************************************/
int nfs_remove(struct inode *mountpt, const char *relpath) //done
{
struct nsfmount *nmp;
struct nfsnode *np;
void *datreply;
struct REMOVE3args *remove;
struct REMOVE3resok resok;
int error = 0;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
nmp = (struct nfsmount *)mountpt->i_private;
np = nmp->nm_head;
/* Check if the mount is still healthy */
nfs_semtake(nmp);
error = fat_checkmount(nmp);
if (error == 0)
{
/* If the file is open, the correct behavior is to remove the file
* name, but to keep the file cluster chain in place until the last
* open reference to the file is closed.
*/
/* Remove the file */
if (np->n_type != NFREG)
{
error = EPERM;
goto errout_with_semaphore;
}
/* Do the rpc */
nfsstats.rpccnt[NFSPROC_REMOVE]++;
remove->dir = nmp->nm_fh;
remove->name = relpath;
error = nfs_request(nmp, NFSPROC_REMOVE, remove, datareply);
/* 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;
}
if (error)
{
goto errout_with_semaphore;
}
resok = (struct REMOVE3resok *)datareply;
np->n_fattr = resok->dir_wcc->after;
np->n_flag |= NMODIFIED;
}
NFS_INVALIDATE_ATTRCACHE(np);
errout_with_semaphore:
nfs_semgive(nmp);
return error;
}
/****************************************************************************
* Name: nfs_rename
*
* Description: Rename a file or directory
*
****************************************************************************/
int nfs_rename(struct inode *mountpt, const char *oldrelpath,
const char *newrelpath)
{
struct nsfmount *nmp;
struct nfsnode *np;
void *datreply;
struct RENAME3args *rename;
struct RENAME3resok resok;
int error = 0;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
nmp = (struct nfsmount *)mountpt->i_private;
np = nmp->nm_head;
/* Check if the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != 0)
{
goto errout_with_semaphore;
}
if (np->nfsv3_type != NFREG && np->nfsv3_type != NFDIR)
{
fdbg("open eacces typ=%d\n", np->nfsv3_type);
error= -EACCES;
goto errout_with_semaphore;
}
nfsstats.rpccnt[NFSPROC_RENAME]++;
rename->from->dir = nmp->nm_fh;
rename->from->name = oldrelpath;
rename->to->dir = nmp->nm_fh;
rename->to->name = oldrelpath;
error = nfs_request(fdvp, NFSPROC_RENAME, rename, datareply);
/* Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. */
if (error == ENOENT)
{
error = 0;
}
if (error)
{
goto errout_with_semaphore;
}
resok = (struct RENAME3resok *) datareply;
np->n_fattr = resok->todir_wcc->after
np->n_flag |= NMODIFIED;
NFS_INVALIDATE_ATTRCACHE(np);
errout_with_semaphore:
nfs_semgive(nmp);
return error;
}
/****************************************************************************
* Name: nfs_mkdir
*
* Description: Create a directory
*
****************************************************************************/
int nfs_mkdir(struct inode *mountpt, const char *relpath, mode_t mode)
{
struct nfsv3_sattr *vap;
struct nfsv3_sattr *sp;
struct nfsmount *nmp;
struct nfsnode *np;
struct MKDIR3args *mkdir;
struct MKDIR3resok resok;
void *datareply;
int len;
struct nfsnode *npL;
int error = 0;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
nmp = (struct nfsmount*) mountpt->i_private;
np = nmp->nm_head;
vap = np->n_fattr;
/* 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]++;
mkdir->dir = nmp->nm_fh;
mkdir->name = relpath;
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);
mkdir->attributes = sp;
error = nfs_request(nmp, NFSPROC_MKDIR, mkdir, datareply);
if (error)
{
goto errout_with_semaphore;
}
nmp->n_flag |= NMODIFIED;
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
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;
uint32_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) //seems done
{
//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) //seems done
{
int len, left;
struct nfs_dirent *ndp = NULL;
struct nfs_dirent *dp = NULL;
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*/
while (more_dirs && bigenough)
{
if (bigenough)
{
if (info_v3)
{
dir->u.nfs.cookie[0] = cookie.nfsuquad[0];
}
else
{
dir->u.nfs.cookie[0] = ndp->cookie[0] = 0;
}
dir->u.nfs.cookie[1] = ndp->cookie[1] = cookie.nfsuquad[1];
}
more_dirs = fxdr_unsigned(int, *ndp);
}
}
/* 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) //done
{
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(filep);
nvdbg("tag VT_NFS, fileid %ld fsid 0x%lx",
np->n_fattr.nfsv3fa_fileid, np->n_fattr.nfsv3fa_fsid);
nvdbg("\n");
return 0;
}
*/
/* nfs version 3 fsinfo rpc call */
int nfs_fsinfo(struct nfsmount *nmp) //done
{
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) //done
{
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))
{
nvdbg("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, void *data, void **handle) //done
{
int error;
struct nfs_args args;
struct sockaddr *nam;
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;
}
else
{
return EPROGMISMATCH;
}
if ((args.flags & (NFSMNT_NFSV3 | NFSMNT_RDIRPLUS)) == NFSMNT_RDIRPLUS)
{
return EINVAL;
}
if (blkdriver->mnt_flag & MNT_UPDATE)
{
struct nfsmount *nmp = (struct nfsmount*)blkdriver->i_private;
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);
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) //done
{
struct nfsmount *nmp;
int error;
if (blkdriver->mnt_flag & MNT_UPDATE)
{
nmp = (struct nfsmount*)blkdriver->i_private;
/* 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);
// bcopy(pth, nmp->nm_mntonname, 90);
//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 = blkdriver->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) //done
{
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;
}
/****************************************************************************
* Name: nfs_sync
*
* Description: Flush out the buffer cache
*
****************************************************************************/
int nfs_sync(struct file *filep) //falta
{
struct inode *inode;
struct nfsmount *nmp;
struct nfsnode *np;
int error = 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);
/* Make sure that the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != 0)
{
goto errout_with_semaphore;
}
/* Force stale buffer cache information to be flushed. */
/* Check if the has been modified in any way */
if ((np->n_flag & NMODIFIED) != 0)
{
error = VOP_FSYNC(vp, cred, waitfor, p); ///////////////////////////////
}
return allerror;
errout_with_semaphore:
nfs_semgive(nmp);
return error;
}