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nuttx/fs/nfs/nfs_vfsops.c
patacongo d01b64585e Refactor nfs_socket.c/.h logic; Those files are not gone 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4878 42af7a65-404d-4744-a932-0658087f49c3
2012-06-27 22:03:32 +00:00

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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>
* Gregory Nutt <gnutt@nuttx.org>
*
* 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 <nuttx/config.h>
#include <sys/socket.h>
#include <sys/statfs.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <queue.h>
#include <string.h>
#include <fcntl.h>
#include <time.h>
#include <semaphore.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/dirent.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/nfs.h>
#include <nuttx/net/uip/uip.h>
#include <nuttx/net/uip/uip-udp.h>
#include <nuttx/net/uip/uipopt.h>
#include <net/if.h>
#include <netinet/in.h>
#include "nfs.h"
#include "rpc.h"
#include "nfs_proto.h"
#include "nfs_node.h"
#include "nfs_mount.h"
#include "xdr_subs.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* The V3 EXCLUSIVE file creation logic is not fully supported. */
#define USE_GUARDED_CREATE 1
/* include/nuttx/fs/dirent.h has its own version of these lengths. They must
* match the NFS versions.
*/
#if NFSX_V3FHMAX != DIRENT_NFS_MAXHANDLE
# error "Length of file handle in fs_dirent_s is incorrect"
#endif
#if NFSX_V3COOKIEVERF != DIRENT_NFS_VERFLEN
# error "Length of cookie verify in fs_dirent_s is incorrect"
#endif
/****************************************************************************
* Public Variables
****************************************************************************/
uint32_t nfs_true;
uint32_t nfs_false;
uint32_t nfs_xdrneg1;
#ifdef CONFIG_NFS_STATISTICS
struct nfsstats nfsstats;
#endif
/****************************************************************************
* Private Type Definitions
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int nfs_filecreate(FAR struct nfsmount *nmp, struct nfsnode *np,
FAR const char *relpath, mode_t mode);
static int nfs_filetruncate(FAR struct nfsmount *nmp, struct nfsnode *np);
static int nfs_fileopen(FAR struct nfsmount *nmp, struct nfsnode *np,
FAR const char *relpath, int oflags, mode_t mode);
static int nfs_open(FAR struct file *filep, const char *relpath,
int oflags, mode_t mode);
static int nfs_close(FAR struct file *filep);
static ssize_t nfs_read(FAR struct file *filep, char *buffer, size_t buflen);
static ssize_t nfs_write(FAR struct file *filep, const char *buffer,
size_t buflen);
static int nfs_opendir(struct inode *mountpt, const char *relpath,
struct fs_dirent_s *dir);
static int nfs_readdir(struct inode *mountpt, struct fs_dirent_s *dir);
static int nfs_rewinddir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir);
static void nfs_decode_args(FAR struct nfs_mount_parameters *nprmt,
FAR struct nfs_args *argp);
static int nfs_bind(FAR struct inode *blkdriver, const void *data,
void **handle);
static int nfs_unbind(void *handle, FAR struct inode **blkdriver);
static int nfs_statfs(struct inode *mountpt, struct statfs *buf);
static int nfs_remove(struct inode *mountpt, const char *relpath);
static int nfs_mkdir(struct inode *mountpt, const char *relpath,
mode_t mode);
static int nfs_rmdir(struct inode *mountpt, const char *relpath);
static int nfs_rename(struct inode *mountpt, const char *oldrelpath,
const char *newrelpath);
static int nfs_stat(struct inode *mountpt, const char *relpath,
struct stat *buf);
/****************************************************************************
* Public Data
****************************************************************************/
/* nfs vfs operations. */
const struct mountpt_operations nfs_operations =
{
nfs_open, /* open */
nfs_close, /* close */
nfs_read, /* read */
nfs_write, /* write */
NULL, /* seek */
NULL, /* ioctl */
NULL, /* sync */
nfs_opendir, /* opendir */
NULL, /* closedir */
nfs_readdir, /* readdir */
nfs_rewinddir, /* rewinddir */
nfs_bind, /* bind */
nfs_unbind, /* unbind */
nfs_statfs, /* statfs */
nfs_remove, /* unlink */
nfs_mkdir, /* mkdir */
nfs_rmdir, /* rmdir */
nfs_rename, /* rename */
nfs_stat /* stat */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nfs_filecreate
*
* Description:
* Create a file. This is part of the file open logic that is executed if
* the user asks to create a file.
*
* Returned Value:
* 0 on success; a positive errno value on failure.
*
****************************************************************************/
static int nfs_filecreate(FAR struct nfsmount *nmp, struct nfsnode *np,
FAR const char *relpath, mode_t mode)
{
struct file_handle fhandle;
struct nfs_fattr fattr;
char filename[NAME_MAX + 1];
FAR uint32_t *ptr;
uint32_t tmp;
int namelen;
int reqlen;
int error;
/* Find the NFS node of the directory containing the file to be created */
error = nfs_finddir(nmp, relpath, &fhandle, &fattr, filename);
if (error != OK)
{
fdbg("ERROR: nfs_finddir returned: %d\n", error);
return error;
}
/* Create the CREATE RPC call arguments */
ptr = (FAR uint32_t *)&nmp->nm_msgbuffer.create.create;
reqlen = 0;
/* Copy the variable length, directory file handle */
*ptr++ = txdr_unsigned(fhandle.length);
reqlen += sizeof(uint32_t);
memcpy(ptr, &fhandle.handle, fhandle.length);
reqlen += (int)fhandle.length;
ptr += uint32_increment(fhandle.length);
/* Copy the variable-length file name */
namelen = strlen(filename);
*ptr++ = txdr_unsigned(namelen);
reqlen += sizeof(uint32_t);
memcpy(ptr, filename, namelen);
ptr += uint32_increment(namelen);
reqlen += uint32_alignup(namelen);
/* Set the creation mode */
if ((mode & O_CREAT) != 0)
{
#ifdef USE_GUARDED_CREATE
*ptr++ = HTONL(NFSV3CREATE_GUARDED);
#else
*ptr++ = HTONL(NFSV3CREATE_EXCLUSIVE);
#endif
}
else
{
*ptr++ = HTONL(NFSV3CREATE_UNCHECKED);
}
reqlen += sizeof(uint32_t);
/* Mode information is not provided if EXCLUSIVE creation is used.
* in this case, we must call SETATTR after successfully creating
* the file.
*/
#ifndef USE_GUARDED_CREATE
if ((mode & O_CREAT) == 0)
#endif
{
/* Set the mode. NOTE: Here we depend on the fact that the NuttX and NFS
* bit settings are the same (at least for the bits of interest).
*/
*ptr++ = nfs_true; /* True: mode value follows */
reqlen += sizeof(uint32_t);
tmp = mode & (NFSMODE_IWOTH | NFSMODE_IROTH | NFSMODE_IWGRP |
NFSMODE_IRGRP | NFSMODE_IWUSR | NFSMODE_IRUSR);
*ptr++ = txdr_unsigned(tmp);
reqlen += sizeof(uint32_t);
/* Set the user ID to zero */
*ptr++ = nfs_true; /* True: Uid value follows */
*ptr++ = 0; /* UID = 0 (nobody) */
reqlen += 2*sizeof(uint32_t);
/* Set the group ID to one */
*ptr++ = nfs_true; /* True: Gid value follows */
*ptr++ = HTONL(1); /* GID = 1 (nogroup) */
reqlen += 2*sizeof(uint32_t);
/* Set the size to zero */
*ptr++ = nfs_true; /* True: Size value follows */
*ptr++ = 0; /* Size = 0 */
*ptr++ = 0;
reqlen += 3*sizeof(uint32_t);
/* Don't change times */
*ptr++ = HTONL(NFSV3SATTRTIME_DONTCHANGE); /* Don't change atime */
*ptr++ = HTONL(NFSV3SATTRTIME_DONTCHANGE); /* Don't change mtime */
reqlen += 2*sizeof(uint32_t);
}
/* Send the NFS request. Note there is special logic here to handle version 3
* exclusive open semantics.
*/
do
{
nfs_statistics(NFSPROC_CREATE);
error = nfs_request(nmp, NFSPROC_CREATE,
(FAR void *)&nmp->nm_msgbuffer.create, reqlen,
(FAR void *)nmp->nm_iobuffer, nmp->nm_buflen);
}
#ifdef USE_GUARDED_CREATE
while (0);
#else
while (((mode & O_CREAT) != 0) && error == EOPNOTSUPP);
#endif
/* Check for success */
if (error == OK)
{
/* Parse the returned data */
ptr = (FAR uint32_t *)&((FAR struct rpc_reply_create *)nmp->nm_iobuffer)->create;
/* Save the file handle in the file data structure */
tmp = *ptr++; /* handle_follows */
if (!tmp)
{
fdbg("ERROR: no file handle follows\n");
return EINVAL;
}
tmp = *ptr++;
tmp = fxdr_unsigned(uint32_t, tmp);
DEBUGASSERT(tmp <= NFSX_V3FHMAX);
np->n_fhsize = (uint8_t)tmp;
memcpy(&np->n_fhandle, ptr, tmp);
ptr += uint32_increment(tmp);
/* Save the attributes in the file data structure */
tmp = *ptr++; /* handle_follows */
if (!tmp)
{
fdbg("WARNING: no file attributes\n");
}
else
{
/* Initialize the file attributes */
nfs_attrupdate(np, (FAR struct nfs_fattr *)ptr);
ptr += uint32_increment(sizeof(struct nfs_fattr));
}
/* Any following dir_wcc data is ignored for now */
}
return error;
}
/****************************************************************************
* Name: nfs_fileopen
*
* Description:
* Truncate an open file to zero length. This is part of the file open
* logic.
*
* Returned Value:
* 0 on success; a positive errno value on failure.
*
****************************************************************************/
static int nfs_filetruncate(FAR struct nfsmount *nmp, struct nfsnode *np)
{
FAR uint32_t *ptr;
int reqlen;
int error;
fvdbg("Truncating file\n");
/* Create the SETATTR RPC call arguments */
ptr = (FAR uint32_t *)&nmp->nm_msgbuffer.setattr.setattr;
reqlen = 0;
/* Copy the variable length, directory file handle */
*ptr++ = txdr_unsigned(np->n_fhsize);
reqlen += sizeof(uint32_t);
memcpy(ptr, &np->n_fhandle, np->n_fhsize);
reqlen += (int)np->n_fhsize;
ptr += uint32_increment(np->n_fhsize);
/* Copy the variable-length attribtes */
*ptr++ = nfs_false; /* Don't change mode */
*ptr++ = nfs_false; /* Don't change uid */
*ptr++ = nfs_false; /* Don't change gid */
*ptr++ = nfs_true; /* Use the following size */
*ptr++ = 0; /* Truncate to zero length */
*ptr++ = 0;
*ptr++ = HTONL(NFSV3SATTRTIME_TOSERVER); /* Use the server's time */
*ptr++ = HTONL(NFSV3SATTRTIME_TOSERVER); /* Use the server's time */
*ptr++ = nfs_false; /* No guard value */
reqlen += 9*sizeof(uint32_t)
/* Perform the SETATTR RPC */
nfs_statistics(NFSPROC_SETATTR);
error = nfs_request(nmp, NFSPROC_SETATTR,
(FAR void *)&nmp->nm_msgbuffer.setattr, reqlen,
(FAR void *)nmp->nm_iobuffer, nmp->nm_buflen);
if (error != OK)
{
fdbg("ERROR: nfs_request failed: %d\n", error);
return error;
}
/* Indicate that the file now has zero length */
np->n_size = 0;
return OK;
}
/****************************************************************************
* Name: nfs_fileopen
*
* Description:
* Open a file. This is part of the file open logic that attempts to open
* an existing file.
*
* Returned Value:
* 0 on success; a positive errno value on failure.
*
****************************************************************************/
static int nfs_fileopen(FAR struct nfsmount *nmp, struct nfsnode *np,
FAR const char *relpath, int oflags, mode_t mode)
{
struct file_handle fhandle;
struct nfs_fattr fattr;
uint32_t tmp;
int error = 0;
/* Find the NFS node associate with the path */
error = nfs_findnode(nmp, relpath, &fhandle, &fattr, NULL);
if (error != OK)
{
fdbg("ERROR: nfs_findnode returned: %d\n", error);
return error;
}
/* Check if the object is a directory */
tmp = fxdr_unsigned(uint32_t, fattr.fa_type);
if (tmp == NFDIR)
{
/* Exit with EISDIR if we attempt to open a directory */
fdbg("ERROR: Path is a directory\n");
return EISDIR;
}
/* Check if the caller has sufficient privileges to open the file */
if ((oflags & O_WRONLY) != 0)
{
/* Check if anyone has priveleges to write to the file -- owner,
* group, or other (we are probably "other" and may still not be
* able to write).
*/
tmp = fxdr_unsigned(uint32_t, fattr.fa_mode);
if ((tmp & (NFSMODE_IWOTH|NFSMODE_IWGRP|NFSMODE_IWUSR)) == 0)
{
fdbg("ERROR: File is read-only: %08x\n", tmp);
return EACCES;
}
}
/* It would be an error if we are asked to create the file exclusively */
if ((oflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL))
{
/* Already exists -- can't create it exclusively */
fdbg("ERROR: File exists\n");
return EEXIST;
}
/* Initialize the file private data */
/* Copy the file handle */
np->n_fhsize = (uint8_t)fhandle.length;
memcpy(&np->n_fhandle, &fhandle.handle, fhandle.length);
/* Save the file attributes */
nfs_attrupdate(np, &fattr);
/* If O_TRUNC is specified and the file is opened for writing,
* then truncate the file. This operation requires that the file is
* writable, but we have already checked that. O_TRUNC without write
* access is ignored.
*/
if ((oflags & (O_TRUNC|O_WRONLY)) == (O_TRUNC|O_WRONLY))
{
/* Truncate the file to zero length. I think we can do this with
* the SETATTR call by setting the length to zero.
*/
return nfs_filetruncate(nmp, np);
}
return OK;
}
/****************************************************************************
* Name: nfs_open
*
* Description:
* 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.
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
static int nfs_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode)
{
struct nfsmount *nmp;
struct nfsnode *np = NULL;
int error;
/* 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
*/
nmp = (struct nfsmount*)filep->f_inode->i_private;
DEBUGASSERT(nmp != NULL);
/* Pre-allocate the file private data to describe the opened file. */
np = (struct nfsnode *)kzalloc(sizeof(struct nfsnode));
if (!np)
{
fdbg("ERROR: Failed to allocate private data\n");
return -ENOMEM;
}
/* Check if the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != OK)
{
fdbg("ERROR: nfs_checkmount failed: %d\n", error);
goto errout_with_semaphore;
}
/* Try to open an existing file at that path */
error = nfs_fileopen(nmp, np, relpath, oflags, mode);
if (error != OK)
{
/* An error occurred while trying to open the existing file. Check if
* the open failed because the file does not exist. That is not
* necessarily an error; that may only mean that we have to create the
* file.
*/
if (error != ENOENT)
{
fdbg("ERROR: nfs_findnode failed: %d\n", error);
goto errout_with_semaphore;
}
/* The file does not exist. Check if we were asked to create the file. If
* the O_CREAT bit is set in the oflags then we should create the file if it
* does not exist.
*/
if ((oflags & O_CREAT) == 0)
{
/* Return ENOENT if the file does not exist and we were not asked
* to create it.
*/
fdbg("ERROR: File does not exist\n");
error = ENOENT;
goto errout_with_semaphore;
}
/* Create the file */
error = nfs_filecreate(nmp, np, relpath, mode);
if (error != OK)
{
fdbg("ERROR: nfs_filecreate failed: %d\n", error);
goto errout_with_semaphore;
}
}
/* Initialize the file private data (only need to initialize
* non-zero elements)
*/
/* Attach the private data to the struct file instance */
filep->f_priv = np;
/* Then insert the new instance at the head of the list in the mountpoint
* tructure. 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. We
* cannot unmount the file system if this list is not empty!
*/
np->n_next = nmp->nm_head;
nmp->nm_head = np;
np->n_flags |= (NFSNODE_OPEN | NFSNODE_MODIFIED);
nfs_semgive(nmp);
return OK;
errout_with_semaphore:
if (np)
{
kfree(np);
}
nfs_semgive(nmp);
return -error;
}
/****************************************************************************
* Name: nfs_close
*
* Description:
* Close a file.
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
static int nfs_close(FAR struct file *filep)
{
FAR struct nfsmount *nmp;
FAR struct nfsnode *np;
FAR struct nfsnode *prev;
FAR struct nfsnode *curr;
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover our private data from the struct file instance */
nmp = (struct nfsmount*) filep->f_inode->i_private;
np = (struct nfsnode*) filep->f_priv;
DEBUGASSERT(nmp != NULL);
/* Get exclusive access to the mount structure. */
nfs_semtake(nmp);
/* Find our file structure in the list of file structures containted in the
* mount structure.
*/
for (prev = NULL, curr = nmp->nm_head; curr; prev = curr, curr = curr->n_next)
{
/* Check if this node is ours */
if (np == curr)
{
/* Yes.. remove it from the list of file structures */
if (prev)
{
/* Remove from mid-list */
prev->n_next = np->n_next;
}
else
{
/* Remove from the head of the list */
nmp->nm_head = np->n_next;
}
/* Then deallocate the file structure and return success */
kfree(np);
nfs_semgive(nmp);
return OK;
}
}
fdbg("ERROR: file structure not found in list: %p\n", np);
nfs_semgive(nmp);
return EINVAL;
}
/****************************************************************************
* Name: nfs_read
*
* Returned Value:
* The (non-negative) number of bytes read on success; a negated errno
* value on failure.
*
****************************************************************************/
static ssize_t nfs_read(FAR struct file *filep, char *buffer, size_t buflen)
{
FAR struct nfsmount *nmp;
FAR struct nfsnode *np;
ssize_t readsize;
ssize_t tmp;
ssize_t bytesread;
size_t reqlen;
FAR uint32_t *ptr;
int error = 0;
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 */
nmp = (struct nfsmount*) filep->f_inode->i_private;
np = (struct nfsnode*) filep->f_priv;
DEBUGASSERT(nmp != NULL);
/* Make sure that the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != OK)
{
fdbg("nfs_checkmount failed: %d\n", error);
goto errout_with_semaphore;
}
/* Get the number of bytes left in the file and truncate read count so that
* it does not exceed the number of bytes left in the file.
*/
tmp = np->n_size - filep->f_pos;
if (buflen > tmp)
{
buflen = tmp;
fvdbg("Read size truncated to %d\n", buflen);
}
/* Now loop until we fill the user buffer (or hit the end of the file) */
for (bytesread = 0; bytesread < buflen; )
{
/* Make sure that the attempted read size does not exceed the RPC maximum */
readsize = buflen;
if (readsize > nmp->nm_rsize)
{
readsize = nmp->nm_rsize;
}
/* Make sure that the attempted read size does not exceed the IO buffer size */
tmp = SIZEOF_rpc_reply_read(readsize);
if (tmp > nmp->nm_buflen)
{
readsize -= (tmp - nmp->nm_buflen);
}
/* Initialize the request */
ptr = (FAR uint32_t*)&nmp->nm_msgbuffer.read.read;
reqlen = 0;
/* Copy the variable length, file handle */
*ptr++ = txdr_unsigned((uint32_t)np->n_fhsize);
reqlen += sizeof(uint32_t);
memcpy(ptr, &np->n_fhandle, np->n_fhsize);
reqlen += (int)np->n_fhsize;
ptr += uint32_increment((int)np->n_fhsize);
/* Copy the file offset */
txdr_hyper((uint64_t)filep->f_pos, ptr);
ptr += 2;
reqlen += 2*sizeof(uint32_t);
/* Set the readsize */
*ptr = txdr_unsigned(readsize);
reqlen += sizeof(uint32_t);
/* Perform the read */
fvdbg("Reading %d bytes\n", readsize);
nfs_statistics(NFSPROC_READ);
error = nfs_request(nmp, NFSPROC_READ,
(FAR void *)&nmp->nm_msgbuffer.read, reqlen,
(FAR void *)nmp->nm_iobuffer, nmp->nm_buflen);
if (error)
{
fdbg("ERROR: nfs_request failed: %d\n", error);
goto errout_with_semaphore;
}
/* The read was successful. Get a pointer to the beginning of the NFS
* response data.
*/
ptr = (FAR uint32_t *)&((FAR struct rpc_reply_read *)nmp->nm_iobuffer)->read;
/* Check if attributes are included in the responses */
tmp = *ptr++;
if (*ptr != 0)
{
/* Yes... just skip over the attributes for now */
ptr += uint32_increment(sizeof(struct nfs_fattr));
}
/* This is followed by the count of data read. Isn't this
* the same as the length that is included in the read data?
*
* Just skip over if for now.
*/
ptr++;
/* Next comes an EOF indication. Save that in tmp for now. */
tmp = *ptr++;
/* Then the length of the read data followed by the read data itself */
readsize = fxdr_unsigned(uint32_t, *ptr);
ptr++;
/* Copy the read data into the user buffer */
memcpy(buffer, ptr, readsize);
/* Update the read state data */
filep->f_pos += readsize;
bytesread += readsize;
buffer += readsize;
/* Check if we hit the end of file */
if (tmp != 0)
{
break;
}
}
fvdbg("Read %d bytes\n", bytesread);
nfs_semgive(nmp);
return bytesread;
errout_with_semaphore:
nfs_semgive(nmp);
return -error;
}
/****************************************************************************
* Name: nfs_write
*
* Returned Value:
* The (non-negative) number of bytes written on success; a negated errno
* value on failure.
*
****************************************************************************/
static ssize_t nfs_write(FAR struct file *filep, const char *buffer,
size_t buflen)
{
struct nfsmount *nmp;
struct nfsnode *np;
ssize_t writesize;
ssize_t bufsize;
ssize_t byteswritten;
size_t reqlen;
FAR uint32_t *ptr;
uint32_t tmp;
int commit = 0;
int committed = NFSV3WRITE_FILESYNC;
int error;
fvdbg("Write %d bytes to 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 */
nmp = (struct nfsmount*)filep->f_inode->i_private;
np = (struct nfsnode*)filep->f_priv;
DEBUGASSERT(nmp != NULL);
/* Make sure that the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != OK)
{
fdbg("nfs_checkmount failed: %d\n", error);
goto errout_with_semaphore;
}
/* Check if the file size would exceed the range of off_t */
if (np->n_size + buflen < np->n_size)
{
error = EFBIG;
goto errout_with_semaphore;
}
/* Now loop until we send the entire user buffer */
writesize = 0;
for (byteswritten = 0; byteswritten < buflen; )
{
/* Make sure that the attempted write size does not exceed the RPC maximum */
writesize = buflen;
if (writesize > nmp->nm_wsize)
{
writesize = nmp->nm_wsize;
}
/* Make sure that the attempted read size does not exceed the IO buffer size */
bufsize = SIZEOF_rpc_call_write(writesize);
if (bufsize > nmp->nm_buflen)
{
writesize -= (bufsize - nmp->nm_buflen);
}
/* Initialize the request. Here we need an offset pointer to the write
* arguments, skipping over the RPC header. Write is unique among the
* RPC calls in that the entry RPC calls messasge lies in the I/O buffer
*/
ptr = (FAR uint32_t *)&((FAR struct rpc_call_write *)nmp->nm_iobuffer)->write;
reqlen = 0;
/* Copy the variable length, file handle */
*ptr++ = txdr_unsigned((uint32_t)np->n_fhsize);
reqlen += sizeof(uint32_t);
memcpy(ptr, &np->n_fhandle, np->n_fhsize);
reqlen += (int)np->n_fhsize;
ptr += uint32_increment((int)np->n_fhsize);
/* Copy the file offset */
txdr_hyper((uint64_t)filep->f_pos, ptr);
ptr += 2;
reqlen += 2*sizeof(uint32_t);
/* Copy the count and stable values */
*ptr++ = txdr_unsigned(buflen);
*ptr++ = txdr_unsigned(committed);
reqlen += 2*sizeof(uint32_t);
/* Copy a chunk of the user data into the I/O buffer */
*ptr++ = txdr_unsigned(buflen);
reqlen += sizeof(uint32_t);
memcpy(ptr, buffer, writesize);
reqlen += uint32_alignup(writesize);
/* Perform the write */
nfs_statistics(NFSPROC_WRITE);
error = nfs_request(nmp, NFSPROC_WRITE,
(FAR void *)nmp->nm_iobuffer, reqlen,
(FAR void *)&nmp->nm_msgbuffer.write, sizeof(struct rpc_reply_write));
if (error)
{
fdbg("ERROR: nfs_request failed: %d\n", error);
goto errout_with_semaphore;
}
/* Get a pointer to the WRITE reply data */
ptr = (FAR uint32_t *)&nmp->nm_msgbuffer.write.write;
/* Parse file_wcc. First, check if WCC attributes follow. */
tmp = *ptr++;
if (tmp != 0)
{
/* Yes.. WCC attributes follow. But we just skip over them. */
ptr += uint32_increment(sizeof(struct wcc_attr));
}
/* Check if normal file attributes follow */
tmp = *ptr++;
if (tmp != 0)
{
/* Yes.. Update the cached file status in the file structure. */
nfs_attrupdate(np, (FAR struct nfs_fattr *)ptr);
ptr += uint32_increment(sizeof(struct nfs_fattr));
}
/* Get the count of bytes actually written */
tmp = fxdr_unsigned(uint32_t, *ptr);
ptr++;
if (tmp < 1 || tmp > writesize)
{
error = EIO;
goto errout_with_semaphore;
}
writesize = tmp;
/* Determine the lowest committment level obtained by any of the RPCs. */
commit = *ptr++;
if (committed == NFSV3WRITE_FILESYNC)
{
committed = commit;
}
else if (committed == NFSV3WRITE_DATASYNC &&
commit == NFSV3WRITE_UNSTABLE)
{
committed = commit;
}
/* Update the read state data */
filep->f_pos += writesize;
byteswritten += writesize;
buffer += writesize;
}
nfs_semgive(nmp);
return writesize;
errout_with_semaphore:
nfs_semgive(nmp);
return -error;
}
/****************************************************************************
* Name: nfs_opendir
*
* Description:
* Open a directory for read access
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
static int nfs_opendir(struct inode *mountpt, const char *relpath,
struct fs_dirent_s *dir)
{
struct nfsmount *nmp;
struct file_handle fhandle;
struct nfs_fattr obj_attributes;
uint32_t objtype;
int error;
fvdbg("relpath: \"%s\"\n", relpath ? relpath : "NULL");
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL && dir);
/* Recover our private data from the inode instance */
nmp = mountpt->i_private;
/* Initialize the NFS-specific portions of dirent structure to zero */
memset(&dir->u.nfs, 0, sizeof(struct nfsdir_s));
/* Make sure that the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != OK)
{
fdbg("ERROR: nfs_checkmount failed: %d\n", error);
goto errout_with_semaphore;
}
/* Find the NFS node associate with the path */
error = nfs_findnode(nmp, relpath, &fhandle, &obj_attributes, NULL);
if (error != OK)
{
fdbg("ERROR: nfs_findnode failed: %d\n", error);
goto errout_with_semaphore;
}
/* The entry is a directory */
objtype = fxdr_unsigned(uint32_t, obj_attributes.fa_type);
if (objtype != NFDIR)
{
fdbg("ERROR: Not a directory, type=%d\n", objtype);
error = ENOTDIR;
goto errout_with_semaphore;
}
/* Save the directory information in struct fs_dirent_s so that it can be
* used later when readdir() is called.
*/
dir->u.nfs.nfs_fhsize = (uint8_t)fhandle.length;
DEBUGASSERT(fhandle.length <= DIRENT_NFS_MAXHANDLE);
memcpy(dir->u.nfs.nfs_fhandle, &fhandle.handle, DIRENT_NFS_MAXHANDLE);
error = OK;
errout_with_semaphore:
nfs_semgive(nmp);
return -error;
}
/****************************************************************************
* Name: nfs_readdir
*
* Description: Read from directory
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
static int nfs_readdir(struct inode *mountpt, struct fs_dirent_s *dir)
{
struct nfsmount *nmp;
struct file_handle fhandle;
struct nfs_fattr obj_attributes;
uint32_t tmp;
uint32_t *ptr;
uint8_t *name;
unsigned int length;
int reqlen;
int error = 0;
fvdbg("Entry\n");
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Recover our private data from the inode instance */
nmp = mountpt->i_private;
/* Make sure that the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != OK)
{
fdbg("ERROR: nfs_checkmount failed: %d\n", error);
goto errout_with_semaphore;
}
/* Request a block directory entries, copying directory information from
* the dirent structure.
*/
ptr = (FAR uint32_t*)&nmp->nm_msgbuffer.readdir.readdir;
reqlen = 0;
/* Copy the variable length, directory file handle */
*ptr++ = txdr_unsigned((uint32_t)dir->u.nfs.nfs_fhsize);
reqlen += sizeof(uint32_t);
memcpy(ptr, dir->u.nfs.nfs_fhandle, dir->u.nfs.nfs_fhsize);
reqlen += (int)dir->u.nfs.nfs_fhsize;
ptr += uint32_increment((int)dir->u.nfs.nfs_fhsize);
/* Cookie and cookie verifier */
ptr[0] = dir->u.nfs.nfs_cookie[0];
ptr[1] = dir->u.nfs.nfs_cookie[1];
ptr += 2;
reqlen += 2*sizeof(uint32_t);
memcpy(ptr, dir->u.nfs.nfs_verifier, DIRENT_NFS_VERFLEN);
ptr += uint32_increment(DIRENT_NFS_VERFLEN);
reqlen += DIRENT_NFS_VERFLEN;
/* Number of directory entries (We currently only process one entry at a time) */
*ptr = txdr_unsigned(nmp->nm_readdirsize);
reqlen += sizeof(uint32_t);
/* And read the directory */
nfs_statistics(NFSPROC_READDIR);
error = nfs_request(nmp, NFSPROC_READDIR,
(FAR void *)&nmp->nm_msgbuffer.readdir, reqlen,
(FAR void *)nmp->nm_iobuffer, nmp->nm_buflen);
if (error != OK)
{
fdbg("ERROR: nfs_request failed: %d\n", error);
goto errout_with_semaphore;
}
/* A new group of entries was successfully read. Process the
* information contained in the response header. This information
* includes:
*
* 1) Attributes follow indication - 4 bytes
* 2) Directory attributes - sizeof(struct nfs_fattr)
* 3) Cookie verifier - NFSX_V3COOKIEVERF bytes
* 4) Values follows indication - 4 bytes
*/
ptr = (uint32_t *)&((FAR struct rpc_reply_readdir *)nmp->nm_iobuffer)->readdir;
/* Check if attributes follow, if 0 so Skip over the attributes */
tmp = *ptr++;
if (tmp != 0)
{
/* Attributes are not currently used */
ptr += uint32_increment(sizeof(struct nfs_fattr));
}
/* Save the verification cookie */
memcpy(dir->u.nfs.nfs_verifier, ptr, DIRENT_NFS_VERFLEN);
ptr += uint32_increment(DIRENT_NFS_VERFLEN);
/* Check if values follow. If no values follow, then the EOF indication
* will appear next.
*/
tmp = *ptr++;
if (tmp == 0)
{
/* No values follow, then the reply should consist only of a 4-byte
* end-of-directory indication.
*/
tmp = *ptr++;
if (tmp != 0)
{
fvdbg("End of directory\n");
error = ENOENT;
}
/* What would it mean if there were not data and we not at the end of
* file?
*/
else
{
fvdbg("No data but not end of directory???\n");
error = EAGAIN;
}
goto errout_with_semaphore;
}
/* If we are not at the end of the directory listing, then a set of entries
* will follow the header. Each entry is of the form:
*
* File ID (8 bytes)
* Name length (4 bytes)
* Name string (varaiable size but in multiples of 4 bytes)
* Cookie (8 bytes)
* next entry (4 bytes)
*/
/* There is an entry. Skip over the file ID and point to the length */
ptr += 2;
/* Get the length and point to the name */
tmp = *ptr++;
length = fxdr_unsigned(uint32_t, tmp);
name = (uint8_t*)ptr;
/* Increment the pointer past the name (allowing for padding). ptr
* now points to the cookie.
*/
ptr += uint32_increment(length);
/* Save the cookie and increment the pointer to the next entry */
dir->u.nfs.nfs_cookie[0] = *ptr++;
dir->u.nfs.nfs_cookie[1] = *ptr++;
ptr++; /* Just skip over the nextentry for now */
/* Return the name of the node to the caller */
if (length > NAME_MAX)
{
length = NAME_MAX;
}
memcpy(dir->fd_dir.d_name, name, length);
dir->fd_dir.d_name[length] = '\0';
fvdbg("name: \"%s\"\n", dir->fd_dir.d_name);
/* Get the file attributes associated with this name and return
* the file type.
*/
fhandle.length = (uint32_t)dir->u.nfs.nfs_fhsize;
memcpy(&fhandle.handle, dir->u.nfs.nfs_fhandle, DIRENT_NFS_MAXHANDLE);
error = nfs_lookup(nmp, dir->fd_dir.d_name, &fhandle, &obj_attributes, NULL);
if (error != OK)
{
fdbg("nfs_lookup failed: %d\n", error);
goto errout_with_semaphore;
}
/* Set the dirent file type */
tmp = fxdr_unsigned(uint32_t, obj_attributes.fa_type);
switch (tmp)
{
default:
case NFNON: /* Unknown type */
case NFSOCK: /* Socket */
case NFLNK: /* Symbolic link */
break;
case NFREG: /* Regular file */
dir->fd_dir.d_type = DTYPE_FILE;
break;
case NFDIR: /* Directory */
dir->fd_dir.d_type = DTYPE_DIRECTORY;
break;
case NFBLK: /* Block special device file */
dir->fd_dir.d_type = DTYPE_BLK;
break;
case NFFIFO: /* Named FIFO */
case NFCHR: /* Character special device file */
dir->fd_dir.d_type = DTYPE_CHR;
break;
}
fvdbg("type: %d->%d\n", (int)tmp, dir->fd_dir.d_type);
errout_with_semaphore:
nfs_semgive(nmp);
return -error;
}
/****************************************************************************
* Name: nfs_rewinddir
*
* Description:
* Reset the directory traveral logic to the first entry in the open
* directory.
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
static int nfs_rewinddir(FAR struct inode *mountpt, FAR struct fs_dirent_s *dir)
{
fvdbg("Entry\n");
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && dir != NULL);
/* Reset the NFS-specific portions of dirent structure, retaining only the
* file handle.
*/
memset(&dir->u.nfs.nfs_verifier, 0, DIRENT_NFS_VERFLEN);
dir->u.nfs.nfs_cookie[0] = 0;
dir->u.nfs.nfs_cookie[1] = 0;
return OK;
}
/****************************************************************************
* Name: nfs_decode_args
*
* Returned Value:
* None
*
****************************************************************************/
static void nfs_decode_args(FAR struct nfs_mount_parameters *nprmt,
FAR struct nfs_args *argp)
{
int maxio;
/* Get the selected timeout value */
if ((argp->flags & NFSMNT_TIMEO) != 0 && argp->timeo > 0)
{
uint32_t tmp = ((uint32_t)argp->timeo * NFS_HZ + 5) / 10;
if (tmp < NFS_MINTIMEO)
{
tmp = NFS_MINTIMEO;
}
else if (tmp > NFS_MAXTIMEO)
{
tmp = NFS_MAXTIMEO;
}
nprmt->timeo = tmp;
}
/* Get the selected retransmission count */
if ((argp->flags & NFSMNT_RETRANS) != 0 && argp->retrans > 1)
{
if (argp->retrans < NFS_MAXREXMIT)
{
nprmt->retry = argp->retrans;
}
else
{
nprmt->retry = NFS_MAXREXMIT;
}
}
if ((argp->flags & NFSMNT_SOFT) == 0)
{
nprmt->retry = NFS_MAXREXMIT + 1; /* Past clip limit */
}
/* Get the maximum amount of data that can be transferred in one packet */
if ((argp->sotype == SOCK_DGRAM) != 0)
{
maxio = NFS_MAXDGRAMDATA;
}
else
{
fdbg("ERROR: Only SOCK_DRAM is supported\n");
maxio = NFS_MAXDATA;
}
/* Get the maximum amount of data that can be transferred in one write transfer */
if ((argp->flags & NFSMNT_WSIZE) != 0 && argp->wsize > 0)
{
nprmt->wsize = argp->wsize;
/* Round down to multiple of blocksize */
nprmt->wsize &= ~(NFS_FABLKSIZE - 1);
if (nprmt->wsize <= 0)
{
nprmt->wsize = NFS_FABLKSIZE;
}
}
if (nprmt->wsize > maxio)
{
nprmt->wsize = maxio;
}
if (nprmt->wsize > MAXBSIZE)
{
nprmt->wsize = MAXBSIZE;
}
/* Get the maximum amount of data that can be transferred in one read transfer */
if ((argp->flags & NFSMNT_RSIZE) != 0 && argp->rsize > 0)
{
nprmt->rsize = argp->rsize;
/* Round down to multiple of blocksize */
nprmt->rsize &= ~(NFS_FABLKSIZE - 1);
if (nprmt->rsize <= 0)
{
nprmt->rsize = NFS_FABLKSIZE;
}
}
if (nprmt->rsize > maxio)
{
nprmt->rsize = maxio;
}
if (nprmt->rsize > MAXBSIZE)
{
nprmt->rsize = MAXBSIZE;
}
/* Get the maximum amount of data that can be transferred in directory transfer */
if ((argp->flags & NFSMNT_READDIRSIZE) != 0 && argp->readdirsize > 0)
{
nprmt->readdirsize = argp->readdirsize;
/* Round down to multiple of blocksize */
nprmt->readdirsize &= ~(NFS_DIRBLKSIZ - 1);
if (nprmt->readdirsize < NFS_DIRBLKSIZ)
{
nprmt->readdirsize = NFS_DIRBLKSIZ;
}
}
else if (argp->flags & NFSMNT_RSIZE)
{
nprmt->readdirsize = nprmt->rsize;
}
if (nprmt->readdirsize > maxio)
{
nprmt->readdirsize = maxio;
}
}
/****************************************************************************
* Name: nfs_bind
*
* Description:
* This implements a portion of the mount operation. This function allocates
* and initializes the mountpoint private data and gets mount information
* from the NFS server. The final binding of the private data (containing
* NFS server mount information) to the mountpoint is performed by mount().
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
static int nfs_bind(FAR struct inode *blkdriver, FAR const void *data,
FAR void **handle)
{
FAR struct nfs_args *argp = (FAR struct nfs_args *)data;
FAR struct nfsmount *nmp;
struct rpcclnt *rpc;
struct rpc_call_fs getattr;
struct rpc_reply_getattr resok;
struct nfs_mount_parameters nprmt;
uint32_t buflen;
uint32_t tmp;
int error = 0;
DEBUGASSERT(data && handle);
/* Set default values of the parameters. These may be overridden by
* settings in the argp->flags.
*/
nprmt.timeo = NFS_TIMEO;
nprmt.retry = NFS_RETRANS;
nprmt.wsize = NFS_WSIZE;
nprmt.rsize = NFS_RSIZE;
nprmt.readdirsize = NFS_READDIRSIZE;
nfs_decode_args(&nprmt, argp);
/* Determine the size of a buffer that will hold one RPC data transfer.
* First, get the maximum size of a read and a write transfer */
buflen = SIZEOF_rpc_call_write(nprmt.wsize);
tmp = SIZEOF_rpc_reply_read(nprmt.rsize);
/* The buffer size will be the maximum of those two sizes */
if (tmp > buflen)
{
buflen = tmp;
}
/* But don't let the buffer size exceed the MSS of the socket type */
if (buflen > UIP_UDP_MSS)
{
buflen = UIP_UDP_MSS;
}
/* Create an instance of the mountpt state structure */
nmp = (FAR struct nfsmount *)kzalloc(SIZEOF_nfsmount(buflen));
if (!nmp)
{
fdbg("ERROR: Failed to allocate mountpoint structure\n");
return ENOMEM;
}
/* Save the allocated I/O buffer size */
nmp->nm_buflen = (uint16_t)buflen;
/* Initialize the allocated mountpt state structure. */
/* Initialize the semaphore that controls access. The initial count
* is zero, but nfs_semgive() is called at the completion of initialization,
* incrementing the count to one.
*/
sem_init(&nmp->nm_sem, 0, 0); /* Initialize the semaphore that controls access */
/* Initialize NFS */
nfs_true = txdr_unsigned(TRUE);
nfs_false = txdr_unsigned(FALSE);
nfs_xdrneg1 = txdr_unsigned(-1);
rpcclnt_init();
/* Set initial values of other fields */
nmp->nm_timeo = nprmt.timeo;
nmp->nm_retry = nprmt.retry;
nmp->nm_wsize = nprmt.wsize;
nmp->nm_rsize = nprmt.rsize;
nmp->nm_readdirsize = nprmt.readdirsize;
nmp->nm_fhsize = NFSX_V3FHMAX;
strncpy(nmp->nm_path, argp->path, 90);
memcpy(&nmp->nm_nam, &argp->addr, argp->addrlen);
/* Set up the sockets and per-host congestion */
nmp->nm_sotype = argp->sotype;
if (nmp->nm_sotype == SOCK_DGRAM)
{
/* Connection-less... connect now */
/* Create an instance of the rpc state structure */
rpc = (struct rpcclnt *)kzalloc(sizeof(struct rpcclnt));
if (!rpc)
{
fdbg("ERROR: Failed to allocate rpc structure\n");
return ENOMEM;
}
fvdbg("Connecting\n");
/* Translate nfsmnt flags -> rpcclnt flags */
rpc->rc_path = nmp->nm_path;
rpc->rc_name = &nmp->nm_nam;
rpc->rc_sotype = nmp->nm_sotype;
rpc->rc_retry = nmp->nm_retry;
nmp->nm_rpcclnt = rpc;
error = rpcclnt_connect(nmp->nm_rpcclnt);
if (error != OK)
{
fdbg("ERROR: nfs_connect failed: %d\n", error);
goto bad;
}
}
nmp->nm_mounted = true;
nmp->nm_so = nmp->nm_rpcclnt->rc_so;
memcpy(&nmp->nm_fh, &nmp->nm_rpcclnt->rc_fh, sizeof(nfsfh_t));
/* Get the file attributes */
getattr.fs.fsroot.length = txdr_unsigned(nmp->nm_fhsize);
memcpy(&getattr.fs.fsroot.handle, &nmp->nm_fh, sizeof(nfsfh_t));
error = nfs_request(nmp, NFSPROC_GETATTR,
(FAR void *)&getattr, sizeof(struct FS3args),
(FAR void*)&resok, sizeof(struct rpc_reply_getattr));
if (error)
{
fdbg("ERROR: nfs_request failed: %d\n", error);
goto bad;
}
/* Save the file attributes */
memcpy(&nmp->nm_fattr, &resok.attr, sizeof(struct nfs_fattr));
/* Mounted! */
*handle = (void*)nmp;
nfs_semgive(nmp);
fvdbg("Successfully mounted\n");
return OK;
bad:
if (nmp)
{
/* Disconnect from the server */
rpcclnt_disconnect(nmp->nm_rpcclnt);
/* Free connection-related resources */
sem_destroy(&nmp->nm_sem);
if (nmp->nm_so)
{
kfree(nmp->nm_so);
}
if (nmp->nm_rpcclnt)
{
kfree(nmp->nm_rpcclnt);
}
kfree(nmp);
}
return error;
}
/****************************************************************************
* Name: nfs_unbind
*
* Description: This implements the filesystem portion of the umount
* operation.
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
int nfs_unbind(FAR void *handle, FAR struct inode **blkdriver)
{
FAR struct nfsmount *nmp = (FAR struct nfsmount *)handle;
int error;
fvdbg("Entry\n");
DEBUGASSERT(nmp);
/* Get exclusive access to the mount structure */
nfs_semtake(nmp);
/* Are there any open files? We can tell if there are open files by looking
* at the list of file structures in the mount structure. If this list
* not empty, then there are open files and we cannot unmount now (or a
* crash is sure to follow).
*/
if (nmp->nm_head != NULL)
{
fdbg("ERROR; There are open files: %p\n", nmp->nm_head);
error = EBUSY;
goto errout_with_semaphore;
}
/* No open file... Umount the file system. */
error = rpcclnt_umount(nmp->nm_rpcclnt);
if (error)
{
fdbg("ERROR: rpcclnt_umount failed: %d\n", error);
}
/* Disconnect from the server */
rpcclnt_disconnect(nmp->nm_rpcclnt);
/* And free any allocated resources */
sem_destroy(&nmp->nm_sem);
kfree(nmp->nm_so);
kfree(nmp->nm_rpcclnt);
kfree(nmp);
return -error;
errout_with_semaphore:
nfs_semgive(nmp);
return -error;
}
/****************************************************************************
* Name: nfs_fsinfo
*
* Description:
* Return information about root directory.
*
* Returned Value:
* 0 on success; positive errno value on failure
*
* Assumptions:
* The caller has exclusive access to the NFS mount structure
*
****************************************************************************/
int nfs_fsinfo(FAR struct nfsmount *nmp)
{
struct rpc_call_fs fsinfo;
struct rpc_reply_fsinfo fsp;
uint32_t pref;
uint32_t max;
int error = 0;
fsinfo.fs.fsroot.length = txdr_unsigned(nmp->nm_fhsize);
fsinfo.fs.fsroot.handle = nmp->nm_fh;
/* Request FSINFO from the server */
nfs_statistics(NFSPROC_FSINFO);
error = nfs_request(nmp, NFSPROC_FSINFO,
(FAR void *)&fsinfo, sizeof(struct FS3args),
(FAR void *)&fsp, sizeof(struct rpc_reply_fsinfo));
if (error)
{
return error;
}
/* Save the root file system attributes */
//memcpy(&nmp->nm_fattr. &fsp.obj_attributes, sizeof(struct nfs_fattr));
pref = fxdr_unsigned(uint32_t, fsp.fsinfo.fs_wtpref);
if (pref < nmp->nm_wsize)
{
nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & ~(NFS_FABLKSIZE - 1);
}
max = fxdr_unsigned(uint32_t, fsp.fsinfo.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.fsinfo.fs_rtpref);
if (pref < nmp->nm_rsize)
{
nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & ~(NFS_FABLKSIZE - 1);
}
max = fxdr_unsigned(uint32_t, fsp.fsinfo.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.fsinfo.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;
}
}
return OK;
}
/****************************************************************************
* Name: nfs_statfs
*
* Description:
* Return filesystem statistics
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
static int nfs_statfs(FAR struct inode *mountpt, FAR struct statfs *sbp)
{
FAR struct nfsmount *nmp;
FAR struct rpc_call_fs *fsstat;
FAR struct rpc_reply_fsstat *sfp;
int error = 0;
uint64_t tquad;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
nmp = (struct nfsmount*)mountpt->i_private;
/* Check if the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != OK)
{
fdbg("ERROR: nfs_checkmount failed: %d\n", error);
goto errout_with_semaphore;
}
/* Fill in the statfs info */
sbp->f_type = NFS_SUPER_MAGIC;
(void)nfs_fsinfo(nmp);
fsstat = &nmp->nm_msgbuffer.fsstat;
fsstat->fs.fsroot.length = txdr_unsigned(nmp->nm_fhsize);
memcpy(&fsstat->fs.fsroot.handle, &nmp->nm_fh, sizeof(nfsfh_t));
nfs_statistics(NFSPROC_FSSTAT);
error = nfs_request(nmp, NFSPROC_FSSTAT,
(FAR void *)fsstat, sizeof(struct FS3args),
(FAR void *)nmp->nm_iobuffer, nmp->nm_buflen);
if (error)
{
goto errout_with_semaphore;
}
sfp = (FAR struct rpc_reply_fsstat *)nmp->nm_iobuffer;
sbp->f_bsize = NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->fsstat.sf_tbytes);
sbp->f_blocks = tquad / (uint64_t) NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->fsstat.sf_fbytes);
sbp->f_bfree = tquad / (uint64_t) NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->fsstat.sf_abytes);
sbp->f_bavail = tquad / (uint64_t) NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->fsstat.sf_tfiles);
sbp->f_files = tquad;
tquad = fxdr_hyper(&sfp->fsstat.sf_ffiles);
sbp->f_ffree = tquad;
sbp->f_namelen = NAME_MAX;
errout_with_semaphore:
nfs_semgive(nmp);
return -error;
}
/****************************************************************************
* Name: nfs_remove
*
* Description:
* Remove a file
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
static int nfs_remove(struct inode *mountpt, const char *relpath)
{
FAR struct nfsmount *nmp;
struct file_handle fhandle;
struct nfs_fattr fattr;
char filename[NAME_MAX + 1];
FAR uint32_t *ptr;
int namelen;
int reqlen;
int error;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
nmp = (struct nfsmount*)mountpt->i_private;
/* Check if the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != OK)
{
fdbg("ERROR: nfs_checkmount failed: %d\n", error);
goto errout_with_semaphore;
}
/* Find the NFS node of the directory containing the file to be deleted */
error = nfs_finddir(nmp, relpath, &fhandle, &fattr, filename);
if (error != OK)
{
fdbg("ERROR: nfs_finddir returned: %d\n", error);
goto errout_with_semaphore;
}
/* Create the REMOVE RPC call arguments */
ptr = (FAR uint32_t *)&nmp->nm_msgbuffer.removef.remove;
reqlen = 0;
/* Copy the variable length, directory file handle */
*ptr++ = txdr_unsigned(fhandle.length);
reqlen += sizeof(uint32_t);
memcpy(ptr, &fhandle.handle, fhandle.length);
reqlen += (int)fhandle.length;
ptr += uint32_increment(fhandle.length);
/* Copy the variable-length file name */
namelen = strlen(filename);
*ptr++ = txdr_unsigned(namelen);
reqlen += sizeof(uint32_t);
memcpy(ptr, filename, namelen);
reqlen += uint32_alignup(namelen);
/* Perform the REMOVE RPC call */
nfs_statistics(NFSPROC_REMOVE);
error = nfs_request(nmp, NFSPROC_REMOVE,
(FAR void *)&nmp->nm_msgbuffer.removef, reqlen,
(FAR void *)nmp->nm_iobuffer, nmp->nm_buflen);
errout_with_semaphore:
nfs_semgive(nmp);
return -error;
}
/****************************************************************************
* Name: nfs_mkdir
*
* Description:
* Create a directory
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
static int nfs_mkdir(struct inode *mountpt, const char *relpath, mode_t mode)
{
struct nfsmount *nmp;
struct file_handle fhandle;
struct nfs_fattr fattr;
char dirname[NAME_MAX + 1];
FAR uint32_t *ptr;
uint32_t tmp;
int namelen;
int reqlen;
int error;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
nmp = (struct nfsmount*) mountpt->i_private;
/* Check if the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != OK)
{
fdbg("ERROR: nfs_checkmount: %d\n", error);
goto errout_with_semaphore;
}
/* Find the NFS node of the directory containing the directory to be created */
error = nfs_finddir(nmp, relpath, &fhandle, &fattr, dirname);
if (error != OK)
{
fdbg("ERROR: nfs_finddir returned: %d\n", error);
return error;
}
/* Format the MKDIR call message arguments */
ptr = (FAR uint32_t *)&nmp->nm_msgbuffer.mkdir.mkdir;
reqlen = 0;
/* Copy the variable length, directory file handle */
*ptr++ = txdr_unsigned(fhandle.length);
reqlen += sizeof(uint32_t);
memcpy(ptr, &fhandle.handle, fhandle.length);
ptr += uint32_increment(fhandle.length);
reqlen += (int)fhandle.length;
/* Copy the variable-length directory name */
namelen = strlen(dirname);
*ptr++ = txdr_unsigned(namelen);
reqlen += sizeof(uint32_t);
memcpy(ptr, dirname, namelen);
ptr += uint32_increment(namelen);
reqlen += uint32_alignup(namelen);
/* Set the mode. NOTE: Here we depend on the fact that the NuttX and NFS
* bit settings are the same (at least for the bits of interest).
*/
*ptr++ = nfs_true; /* True: mode value follows */
reqlen += sizeof(uint32_t);
tmp = mode & (NFSMODE_IXOTH | NFSMODE_IWOTH | NFSMODE_IROTH |
NFSMODE_IXGRP | NFSMODE_IWGRP | NFSMODE_IRGRP |
NFSMODE_IXUSR | NFSMODE_IWUSR | NFSMODE_IRUSR);
*ptr++ = txdr_unsigned(tmp);
reqlen += sizeof(uint32_t);
/* Set the user ID to zero */
*ptr++ = nfs_true; /* True: Uid value follows */
*ptr++ = 0; /* UID = 0 (nobody) */
reqlen += 2*sizeof(uint32_t);
/* Set the group ID to one */
*ptr++ = nfs_true; /* True: Gid value follows */
*ptr++ = HTONL(1); /* GID = 1 (nogroup) */
reqlen += 2*sizeof(uint32_t);
/* No size */
*ptr++ = nfs_false; /* False: No size value follows */
reqlen += sizeof(uint32_t);
/* Don't change times */
*ptr++ = HTONL(NFSV3SATTRTIME_DONTCHANGE); /* Don't change atime */
*ptr++ = HTONL(NFSV3SATTRTIME_DONTCHANGE); /* Don't change mtime */
reqlen += 2*sizeof(uint32_t);
/* Perform the MKDIR RPC */
nfs_statistics(NFSPROC_MKDIR);
error = nfs_request(nmp, NFSPROC_MKDIR,
(FAR void *)&nmp->nm_msgbuffer.mkdir, reqlen,
(FAR void *)&nmp->nm_iobuffer, nmp->nm_buflen);
if (error)
{
fdbg("ERROR: nfs_request failed: %d\n", error);
}
errout_with_semaphore:
nfs_semgive(nmp);
return -error;
}
/****************************************************************************
* Name: nfs_rmdir
*
* Description:
* Remove a directory
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
static int nfs_rmdir(struct inode *mountpt, const char *relpath)
{
struct nfsmount *nmp;
struct file_handle fhandle;
struct nfs_fattr fattr;
char dirname[NAME_MAX + 1];
FAR uint32_t *ptr;
int namelen;
int reqlen;
int error;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
nmp = (struct nfsmount *)mountpt->i_private;
/* Check if the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != OK)
{
fdbg("ERROR: nfs_checkmount failed: %d\n", error);
goto errout_with_semaphore;
}
/* Find the NFS node of the directory containing the directory to be removed */
error = nfs_finddir(nmp, relpath, &fhandle, &fattr, dirname);
if (error != OK)
{
fdbg("ERROR: nfs_finddir returned: %d\n", error);
return error;
}
/* Set up the RMDIR call message arguments */
ptr = (FAR uint32_t *)&nmp->nm_msgbuffer.rmdir.rmdir;
reqlen = 0;
/* Copy the variable length, directory file handle */
*ptr++ = txdr_unsigned(fhandle.length);
reqlen += sizeof(uint32_t);
memcpy(ptr, &fhandle.handle, fhandle.length);
reqlen += (int)fhandle.length;
ptr += uint32_increment(fhandle.length);
/* Copy the variable-length directory name */
namelen = strlen(dirname);
*ptr++ = txdr_unsigned(namelen);
reqlen += sizeof(uint32_t);
memcpy(ptr, dirname, namelen);
reqlen += uint32_alignup(namelen);
/* Perform the RMDIR RPC */
nfs_statistics(NFSPROC_RMDIR);
error = nfs_request(nmp, NFSPROC_RMDIR,
(FAR void *)&nmp->nm_msgbuffer.rmdir, reqlen,
(FAR void *)nmp->nm_iobuffer, nmp->nm_buflen);
errout_with_semaphore:
nfs_semgive(nmp);
return -error;
}
/****************************************************************************
* Name: nfs_rename
*
* Description:
* Rename a file or directory
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
static int nfs_rename(struct inode *mountpt, const char *oldrelpath,
const char *newrelpath)
{
struct nfsmount *nmp;
struct file_handle from_handle;
struct file_handle to_handle;
char from_name[NAME_MAX+1];
char to_name[NAME_MAX+1];
struct nfs_fattr fattr;
FAR uint32_t *ptr;
int namelen;
int reqlen;
int error;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
nmp = (struct nfsmount *)mountpt->i_private;
/* Check if the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != OK)
{
fdbg("ERROR: nfs_checkmount returned: %d\n", error);
goto errout_with_semaphore;
}
/* Find the NFS node of the directory containing the 'from' object */
error = nfs_finddir(nmp, oldrelpath, &from_handle, &fattr, from_name);
if (error != OK)
{
fdbg("ERROR: nfs_finddir returned: %d\n", error);
return error;
}
/* Find the NFS node of the directory containing the 'from' object */
error = nfs_finddir(nmp, newrelpath, &to_handle, &fattr, to_name);
if (error != OK)
{
fdbg("ERROR: nfs_finddir returned: %d\n", error);
return error;
}
/* Format the RENAME RPC arguments */
ptr = (FAR uint32_t *)&nmp->nm_msgbuffer.renamef.rename;
reqlen = 0;
/* Copy the variable length, 'from' directory file handle */
*ptr++ = txdr_unsigned(from_handle.length);
reqlen += sizeof(uint32_t);
memcpy(ptr, &from_handle.handle, from_handle.length);
reqlen += (int)from_handle.length;
ptr += uint32_increment(from_handle.length);
/* Copy the variable-length 'from' object name */
namelen = strlen(from_name);
*ptr++ = txdr_unsigned(namelen);
reqlen += sizeof(uint32_t);
memcpy(ptr, from_name, namelen);
reqlen += uint32_alignup(namelen);
ptr += uint32_increment(namelen);
/* Copy the variable length, 'to' directory file handle */
*ptr++ = txdr_unsigned(to_handle.length);
reqlen += sizeof(uint32_t);
memcpy(ptr, &to_handle.handle, to_handle.length);
ptr += uint32_increment(to_handle.length);
reqlen += (int)to_handle.length;
/* Copy the variable-length 'to' object name */
namelen = strlen(to_name);
*ptr++ = txdr_unsigned(namelen);
reqlen += sizeof(uint32_t);
memcpy(ptr, to_name, namelen);
reqlen += uint32_alignup(namelen);
/* Perform the RENAME RPC */
nfs_statistics(NFSPROC_RENAME);
error = nfs_request(nmp, NFSPROC_RENAME,
(FAR void *)&nmp->nm_msgbuffer.renamef, reqlen,
(FAR void *)nmp->nm_iobuffer, nmp->nm_buflen);
errout_with_semaphore:
nfs_semgive(nmp);
return -error;
}
/****************************************************************************
* Name: nfs_stat
*
* Description:
* Return information about the file system object at 'relpath'
*
* Returned Value:
* 0 on success; a negated errno value on failure.
*
****************************************************************************/
static int nfs_stat(struct inode *mountpt, const char *relpath,
struct stat *buf)
{
struct nfsmount *nmp;
struct file_handle fhandle;
struct nfs_fattr obj_attributes;
uint32_t tmp;
uint32_t mode;
int error;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
nmp = (struct nfsmount*)mountpt->i_private;
DEBUGASSERT(nmp && buf);
/* Check if the mount is still healthy */
nfs_semtake(nmp);
error = nfs_checkmount(nmp);
if (error != OK)
{
fdbg("ERROR: nfs_checkmount failed: %d\n", error);
goto errout_with_semaphore;
}
/* Get the file handle attributes of the requested node */
error = nfs_findnode(nmp, relpath, &fhandle, &obj_attributes, NULL);
if (error != OK)
{
fdbg("ERROR: nfs_findnode failed: %d\n", error);
goto errout_with_semaphore;
}
/* Construct the file mode. This is a 32-bit, encoded value containing
* both the access mode and the file type.
*/
tmp = fxdr_unsigned(uint32_t, obj_attributes.fa_mode);
/* Here we exploit the fact that most mode bits are the same in NuttX
* as in the NFSv3 spec.
*/
mode = tmp & (NFSMODE_IXOTH|NFSMODE_IWOTH|NFSMODE_IROTH|
NFSMODE_IXGRP|NFSMODE_IWGRP|NFSMODE_IRGRP|
NFSMODE_IXUSR|NFSMODE_IWUSR|NFSMODE_IRUSR);
/* Handle the cases that are not the same */
if ((mode & NFSMODE_ISGID) != 0)
{
mode |= S_ISGID;
}
if ((mode & NFSMODE_ISUID) != 0)
{
mode |= S_ISUID;
}
/* Now OR in the file type */
tmp = fxdr_unsigned(uint32_t, obj_attributes.fa_type);
switch (tmp)
{
default:
case NFNON: /* Unknown type */
break;
case NFREG: /* Regular file */
mode |= S_IFREG;
break;
case NFDIR: /* Directory */
mode |= S_IFDIR;
break;
case NFBLK: /* Block special device file */
mode |= S_IFBLK;
break;
case NFCHR: /* Character special device file */
mode |= S_IFCHR;
break;
case NFLNK: /* Symbolic link */
mode |= S_IFLNK;
break;
case NFSOCK: /* Socket */
mode |= S_IFSOCK;
break;
case NFFIFO: /* Named pipe */
mode |= S_IFMT;
break;
}
buf->st_mode = mode;
buf->st_size = fxdr_hyper(&obj_attributes.fa_size);
buf->st_blksize = 0;
buf->st_blocks = 0;
buf->st_mtime = fxdr_hyper(&obj_attributes.fa_mtime);
buf->st_atime = fxdr_hyper(&obj_attributes.fa_atime);
buf->st_ctime = fxdr_hyper(&obj_attributes.fa_ctime);
errout_with_semaphore:
nfs_semgive(nmp);
return -error;
}
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