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nuttx/fs/hostfs/hostfs.c
Lingao Meng 778f7f00cb fs/hostfs: Fix long root path construction 
hostfs_mkpath() appends a relative path to the configured host root
with strlcat(). The third argument to strlcat() is the total
destination buffer size, not the remaining free space.

Passing pathlen - strlen(path) makes the effective limit shrink after
a long host root has already been copied. With a sufficiently long
root, a valid relative path can be dropped or truncated, so operations
under the mount point may resolve to the host root instead of the
requested child path.

Pass the full destination buffer size and let strlcat() account for the
current string length internally.

The companion examples/hostfs_longpath app validates this regression by
mounting hostfs with a long host root, writing a probe file below the
mount point, and reading it back. The old size argument drops the
relative component in that scenario; this fix preserves it.

Assisted-by: Claude:Claude-Fable-5
Signed-off-by: Lingao Meng <menglingao@xiaomi.com>
2026-07-23 15:34:02 +08:00

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/****************************************************************************
* fs/hostfs/hostfs.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <fcntl.h>
#include <errno.h>
#include <nuttx/debug.h>
#include <nuttx/lib/lib.h>
#include <nuttx/mutex.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/fat.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/fs/hostfs.h>
#include "inode/inode.h"
#include "hostfs.h"
#include "fs_heap.h"
/****************************************************************************
* Private Types
****************************************************************************/
struct hostfs_dir_s
{
struct fs_dirent_s base;
FAR void *dir;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int hostfs_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode);
static int hostfs_close(FAR struct file *filep);
static ssize_t hostfs_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static ssize_t hostfs_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
static off_t hostfs_seek(FAR struct file *filep, off_t offset,
int whence);
static int hostfs_ioctl(FAR struct file *filep, int cmd,
unsigned long arg);
static int hostfs_sync(FAR struct file *filep);
static int hostfs_dup(FAR const struct file *oldp,
FAR struct file *newp);
static int hostfs_fstat(FAR const struct file *filep,
FAR struct stat *buf);
static int hostfs_fchstat(FAR const struct file *filep,
FAR const struct stat *buf, int flags);
static int hostfs_ftruncate(FAR struct file *filep,
off_t length);
static int hostfs_opendir(FAR struct inode *mountpt,
FAR const char *relpath,
FAR struct fs_dirent_s **dir);
static int hostfs_closedir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir);
static int hostfs_readdir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir,
FAR struct dirent *entry);
static int hostfs_rewinddir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir);
static int hostfs_bind(FAR struct inode *blkdriver,
FAR const void *data, FAR void **handle);
static int hostfs_unbind(FAR void *handle, FAR struct inode **blkdriver,
unsigned int flags);
static int hostfs_statfs(FAR struct inode *mountpt,
FAR struct statfs *buf);
static int hostfs_unlink(FAR struct inode *mountpt,
FAR const char *relpath);
static int hostfs_mkdir(FAR struct inode *mountpt,
FAR const char *relpath, mode_t mode);
static int hostfs_rmdir(FAR struct inode *mountpt,
FAR const char *relpath);
static int hostfs_rename(FAR struct inode *mountpt,
FAR const char *oldrelpath,
FAR const char *newrelpath);
static int hostfs_stat(FAR struct inode *mountpt,
FAR const char *relpath, FAR struct stat *buf);
static int hostfs_chstat(FAR struct inode *mountpt,
FAR const char *relpath,
FAR const struct stat *buf, int flags);
/****************************************************************************
* Private Data
****************************************************************************/
static mutex_t g_lock = NXMUTEX_INITIALIZER;
/****************************************************************************
* Public Data
****************************************************************************/
/* See fs_mount.c -- this structure is explicitly externed there.
* We use the old-fashioned kind of initializers so that this will compile
* with any compiler.
*/
const struct mountpt_operations g_hostfs_operations =
{
hostfs_open, /* open */
hostfs_close, /* close */
hostfs_read, /* read */
hostfs_write, /* write */
hostfs_seek, /* seek */
hostfs_ioctl, /* ioctl */
NULL, /* mmap */
hostfs_ftruncate, /* ftruncate */
NULL, /* poll */
NULL, /* readv */
NULL, /* writev */
hostfs_sync, /* sync */
hostfs_dup, /* dup */
hostfs_fstat, /* fstat */
hostfs_fchstat, /* fchstat */
hostfs_opendir, /* opendir */
hostfs_closedir, /* closedir */
hostfs_readdir, /* readdir */
hostfs_rewinddir, /* rewinddir */
hostfs_bind, /* bind */
hostfs_unbind, /* unbind */
hostfs_statfs, /* statfs */
hostfs_unlink, /* unlink */
hostfs_mkdir, /* mkdir */
hostfs_rmdir, /* rmdir */
hostfs_rename, /* rename */
hostfs_stat, /* stat */
hostfs_chstat, /* chstat */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: hostfs_mkpath
*
* Description: Build absolute host path from relative NuttX path.
*
****************************************************************************/
static void hostfs_mkpath(FAR struct hostfs_mountpt_s *fs,
FAR const char *relpath,
FAR char *path, int pathlen)
{
int depth = 0;
int first;
int x;
/* Copy base host path to output */
strlcpy(path, fs->fs_root, pathlen);
/* Be sure we aren't trying to use ".." to display outside of our
* mounted path.
*/
x = 0;
while (relpath[x] == '/')
{
x++;
}
first = x;
while (relpath[x] != '\0')
{
/* Test for ".." occurrence */
if (strncmp(&relpath[x], "..", 2) == 0)
{
/* Reduce depth by 1 */
depth--;
x += 2;
}
else if (relpath[x] == '/' && relpath[x + 1] != '/' &&
relpath[x + 1] != '\0')
{
depth++;
x++;
}
else
{
x++;
}
}
if (depth >= 0)
{
strlcat(path, &relpath[first], pathlen);
}
}
/****************************************************************************
* Name: hostfs_open
****************************************************************************/
static int hostfs_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode)
{
FAR struct inode *inode;
FAR struct hostfs_mountpt_s *fs;
FAR struct hostfs_ofile_s *hf;
char path[HOSTFS_MAX_PATH];
size_t len;
int ret;
/* Sanity checks */
DEBUGASSERT((filep->f_priv == NULL) && (filep->f_inode != NULL));
/* Get the mountpoint inode reference from the file structure and the
* mountpoint private data from the inode structure
*/
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Allocate memory for the open file */
len = strlen(relpath);
hf = fs_heap_malloc(sizeof(*hf) + len);
if (hf == NULL)
{
ret = -ENOMEM;
goto errout_with_lock;
}
/* Append to the host's root directory */
hostfs_mkpath(fs, relpath, path, sizeof(path));
/* Try to open the file in the host file system */
hf->fd = host_open(path, oflags, mode);
if (hf->fd < 0)
{
/* Error opening file */
ret = hf->fd;
goto errout_with_buffer;
}
/* In write/append mode, we need to set the file pointer to the end of the
* file.
*/
if ((oflags & O_APPEND) && (oflags & O_ACCMODE) != O_RDONLY)
{
ret = host_lseek(hf->fd, 0, 0, SEEK_END);
if (ret >= 0)
{
filep->f_pos = ret;
}
else
{
goto errout_with_buffer;
}
}
/* Attach the private date to the struct file instance */
filep->f_priv = hf;
/* 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).
*/
hf->fnext = fs->fs_head;
hf->crefs = 1;
hf->oflags = oflags;
memcpy(hf->relpath, relpath, len + 1);
fs->fs_head = hf;
ret = OK;
goto errout_with_lock;
errout_with_buffer:
fs_heap_free(hf);
errout_with_lock:
nxmutex_unlock(&g_lock);
if (ret == -EINVAL)
{
ret = -EIO;
}
return ret;
}
/****************************************************************************
* Name: hostfs_close
****************************************************************************/
static int hostfs_close(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct hostfs_mountpt_s *fs;
FAR struct hostfs_ofile_s *hf;
FAR struct hostfs_ofile_s *nextfile;
FAR struct hostfs_ofile_s *prevfile;
int ret;
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL);
/* Recover our private data from the struct file instance */
inode = filep->f_inode;
fs = inode->i_private;
hf = filep->f_priv;
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Check if we are the last one with a reference to the file and
* only close if we are.
*/
if (hf->crefs > 1)
{
/* The file is opened more than once. Just decrement the
* reference count and return.
*/
hf->crefs--;
goto okout;
}
/* Remove ourselves from the linked list */
nextfile = fs->fs_head;
prevfile = nextfile;
while ((nextfile != hf) && (nextfile != NULL))
{
/* Save the previous file pointer too */
prevfile = nextfile;
nextfile = nextfile->fnext;
}
if (nextfile != NULL)
{
/* Test if we were the first entry */
if (nextfile == fs->fs_head)
{
/* Assign a new head */
fs->fs_head = nextfile->fnext;
}
else
{
/* Take ourselves out of the list */
prevfile->fnext = nextfile->fnext;
}
}
/* Close the host file */
host_close(hf->fd);
/* Now free the pointer */
filep->f_priv = NULL;
fs_heap_free(hf);
okout:
nxmutex_unlock(&g_lock);
return OK;
}
/****************************************************************************
* Name: hostfs_read
****************************************************************************/
static ssize_t hostfs_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct inode *inode;
FAR struct hostfs_mountpt_s *fs;
FAR struct hostfs_ofile_s *hf;
ssize_t ret;
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL);
/* Recover our private data from the struct file instance */
hf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Call the host to perform the read */
ret = host_read(hf->fd, buffer, buflen);
if (ret > 0)
{
filep->f_pos += ret;
}
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_write
****************************************************************************/
static ssize_t hostfs_write(FAR struct file *filep, const char *buffer,
size_t buflen)
{
FAR struct inode *inode;
FAR struct hostfs_mountpt_s *fs;
FAR struct hostfs_ofile_s *hf;
ssize_t ret;
DEBUGASSERT(filep->f_priv != NULL);
/* Recover our private data from the struct file instance */
hf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Test the permissions. Only allow write if the file was opened with
* write flags.
*/
if ((hf->oflags & O_ACCMODE) == O_RDONLY)
{
ret = -EACCES;
goto errout_with_lock;
}
/* Call the host to perform the write */
ret = host_write(hf->fd, buffer, buflen);
if (ret > 0)
{
filep->f_pos += ret;
}
errout_with_lock:
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_seek
****************************************************************************/
static off_t hostfs_seek(FAR struct file *filep, off_t offset, int whence)
{
FAR struct inode *inode;
FAR struct hostfs_mountpt_s *fs;
FAR struct hostfs_ofile_s *hf;
off_t ret;
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL);
/* Recover our private data from the struct file instance */
hf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Call our internal routine to perform the seek */
ret = host_lseek(hf->fd, filep->f_pos, offset, whence);
if (ret >= 0)
{
filep->f_pos = ret;
}
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_ioctl
****************************************************************************/
static int hostfs_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode;
FAR struct hostfs_mountpt_s *fs;
FAR struct hostfs_ofile_s *hf;
int ret;
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL);
/* Recover our private data from the struct file instance */
hf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Call our internal routine to perform the ioctl */
ret = host_ioctl(hf->fd, cmd, arg);
if (ret < 0)
{
switch (cmd)
{
case FIOC_FILEPATH:
{
FAR char *path = (FAR char *)(uintptr_t)arg;
ret = inode_getpath(filep->f_inode, path, PATH_MAX);
if (ret >= 0)
{
strlcat(path, hf->relpath, PATH_MAX);
}
}
break;
default:
ret = -ENOTTY;
}
}
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_sync
*
* Description: Synchronize the file state on disk to match internal, in-
* memory state.
*
****************************************************************************/
static int hostfs_sync(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct hostfs_mountpt_s *fs;
FAR struct hostfs_ofile_s *hf;
int ret;
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL);
/* Recover our private data from the struct file instance */
hf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
host_sync(hf->fd);
nxmutex_unlock(&g_lock);
return OK;
}
/****************************************************************************
* Name: hostfs_dup
*
* Description: Duplicate open file data in the new file structure.
*
****************************************************************************/
static int hostfs_dup(FAR const struct file *oldp, FAR struct file *newp)
{
FAR struct hostfs_ofile_s *sf;
/* Sanity checks */
DEBUGASSERT(oldp->f_priv != NULL &&
newp->f_priv == NULL &&
newp->f_inode != NULL);
/* Recover our private data from the struct file instance */
sf = oldp->f_priv;
DEBUGASSERT(sf != NULL);
/* Just increment the reference count on the ofile */
sf->crefs++;
newp->f_priv = (FAR void *)sf;
return OK;
}
/****************************************************************************
* Name: hostfs_fstat
*
* Description:
* Obtain information about an open file associated with the file
* descriptor 'fd', and will write it to the area pointed to by 'buf'.
*
****************************************************************************/
static int hostfs_fstat(FAR const struct file *filep, FAR struct stat *buf)
{
FAR struct inode *inode;
FAR struct hostfs_mountpt_s *fs;
FAR struct hostfs_ofile_s *hf;
int ret = OK;
/* Sanity checks */
DEBUGASSERT(buf != NULL);
/* Recover our private data from the struct file instance */
DEBUGASSERT(filep->f_priv != NULL);
hf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Call the host to perform the read */
ret = host_fstat(hf->fd, buf);
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_fchstat
*
* Description:
* Change information about an open file associated with the file
* descriptor 'fd'.
*
****************************************************************************/
static int hostfs_fchstat(FAR const struct file *filep,
FAR const struct stat *buf, int flags)
{
FAR struct inode *inode;
FAR struct hostfs_mountpt_s *fs;
FAR struct hostfs_ofile_s *hf;
int ret = OK;
/* Sanity checks */
DEBUGASSERT(buf != NULL);
/* Recover our private data from the struct file instance */
DEBUGASSERT(filep->f_priv != NULL);
hf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Call the host to perform the change */
ret = host_fchstat(hf->fd, buf, flags);
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_ftruncate
*
* Description:
* Set the length of the open, regular file associated with the file
* structure 'filep' to 'length'.
*
****************************************************************************/
static int hostfs_ftruncate(FAR struct file *filep, off_t length)
{
FAR struct inode *inode;
FAR struct hostfs_mountpt_s *fs;
FAR struct hostfs_ofile_s *hf;
int ret = OK;
/* Recover our private data from the struct file instance */
DEBUGASSERT(filep->f_priv != NULL);
hf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Call the host to perform the truncate */
ret = host_ftruncate(hf->fd, length);
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_opendir
*
* Description: Open a directory for read access
*
****************************************************************************/
static int hostfs_opendir(FAR struct inode *mountpt, FAR const char *relpath,
FAR struct fs_dirent_s **dir)
{
FAR struct hostfs_mountpt_s *fs;
FAR struct hostfs_dir_s *hdir;
char path[HOSTFS_MAX_PATH];
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Recover our private data from the inode instance */
fs = mountpt->i_private;
hdir = fs_heap_zalloc(sizeof(struct hostfs_dir_s));
if (hdir == NULL)
{
return -ENOMEM;
}
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
goto errout_with_hdir;
}
/* Append to the host's root directory */
hostfs_mkpath(fs, relpath, path, sizeof(path));
/* Call the host's opendir function */
hdir->dir = host_opendir(path);
if (hdir->dir == NULL)
{
ret = -ENOENT;
goto errout_with_lock;
}
*dir = (FAR struct fs_dirent_s *)hdir;
nxmutex_unlock(&g_lock);
return OK;
errout_with_lock:
nxmutex_unlock(&g_lock);
errout_with_hdir:
fs_heap_free(hdir);
return ret;
}
/****************************************************************************
* Name: hostfs_closedir
*
* Description: Open a directory for read access
*
****************************************************************************/
static int hostfs_closedir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir)
{
FAR struct hostfs_dir_s *hdir;
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Recover our private data from the inode instance */
hdir = (FAR struct hostfs_dir_s *)dir;
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Call the host's closedir function */
host_closedir(hdir->dir);
nxmutex_unlock(&g_lock);
fs_heap_free(hdir);
return OK;
}
/****************************************************************************
* Name: hostfs_readdir
*
* Description: Read the next directory entry
*
****************************************************************************/
static int hostfs_readdir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir,
FAR struct dirent *entry)
{
FAR struct hostfs_dir_s *hdir;
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Recover our private data from the inode instance */
hdir = (FAR struct hostfs_dir_s *)dir;
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Call the host OS's readdir function */
ret = host_readdir(hdir->dir, entry);
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_rewindir
*
* Description: Reset directory read to the first entry
*
****************************************************************************/
static int hostfs_rewinddir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir)
{
FAR struct hostfs_dir_s *hdir;
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Recover our private data from the inode instance */
hdir = (FAR struct hostfs_dir_s *)dir;
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Call the host and let it do all the work */
host_rewinddir(hdir->dir);
nxmutex_unlock(&g_lock);
return OK;
}
/****************************************************************************
* Name: hostfs_bind
*
* 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().
*
****************************************************************************/
static int hostfs_bind(FAR struct inode *blkdriver, FAR const void *data,
FAR void **handle)
{
FAR struct hostfs_mountpt_s *fs;
FAR char *options;
FAR char *saveptr;
FAR char *ptr;
int len;
int ret;
/* Validate the block driver is NULL */
if (blkdriver || !data)
{
return -ENODEV;
}
/* Create an instance of the mountpt state structure */
fs = (FAR struct hostfs_mountpt_s *)
fs_heap_zalloc(sizeof(struct hostfs_mountpt_s));
if (fs == NULL)
{
return -ENOMEM;
}
/* The options we support are:
* "fs=whatever", remote dir
*/
options = fs_heap_strdup(data);
if (!options)
{
fs_heap_free(fs);
return -ENOMEM;
}
ptr = strtok_r(options, ",", &saveptr);
while (ptr != NULL)
{
if ((strncmp(ptr, "fs=", 3) == 0))
{
strlcpy(fs->fs_root, &ptr[3], sizeof(fs->fs_root));
}
ptr = strtok_r(NULL, ",", &saveptr);
}
fs_heap_free(options);
/* Take the lock for the mount */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
fs_heap_free(fs);
return ret;
}
/* 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().
*/
fs->fs_head = NULL;
/* Now perform the mount. */
len = strlen(fs->fs_root);
if (len > 1 && fs->fs_root[len - 1] == '/')
{
/* Remove trailing '/' */
fs->fs_root[len - 1] = '\0';
}
/* Append a '/' to the name now */
if (fs->fs_root[len - 1] != '/')
{
strlcat(fs->fs_root, "/", sizeof(fs->fs_root));
}
*handle = (FAR void *)fs;
nxmutex_unlock(&g_lock);
return OK;
}
/****************************************************************************
* Name: hostfs_unbind
*
* Description: This implements the filesystem portion of the umount
* operation.
*
****************************************************************************/
static int hostfs_unbind(FAR void *handle, FAR struct inode **blkdriver,
unsigned int flags)
{
FAR struct hostfs_mountpt_s *fs = (FAR struct hostfs_mountpt_s *)handle;
int ret;
if (!fs)
{
return -EINVAL;
}
/* Check if there are sill any files opened on the filesystem. */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
if (fs->fs_head != NULL)
{
/* We cannot unmount now.. there are open files */
nxmutex_unlock(&g_lock);
/* This implementation currently only supports unmounting if there are
* no open file references.
*/
return (flags != 0) ? -ENOSYS : -EBUSY;
}
nxmutex_unlock(&g_lock);
fs_heap_free(fs);
return ret;
}
/****************************************************************************
* Name: hostfs_statfs
*
* Description: Return filesystem statistics
*
****************************************************************************/
static int hostfs_statfs(FAR struct inode *mountpt, FAR struct statfs *buf)
{
FAR struct hostfs_mountpt_s *fs;
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
fs = mountpt->i_private;
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Call the host fs to perform the statfs */
ret = host_statfs(fs->fs_root, buf);
buf->f_type = HOSTFS_MAGIC;
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_unlink
*
* Description: Remove a file
*
****************************************************************************/
static int hostfs_unlink(FAR struct inode *mountpt, FAR const char *relpath)
{
FAR struct hostfs_mountpt_s *fs;
char path[HOSTFS_MAX_PATH];
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
fs = mountpt->i_private;
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Append to the host's root directory */
hostfs_mkpath(fs, relpath, path, sizeof(path));
/* Call the host fs to perform the unlink */
ret = host_unlink(path);
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_mkdir
*
* Description: Create a directory
*
****************************************************************************/
static int hostfs_mkdir(FAR struct inode *mountpt, FAR const char *relpath,
mode_t mode)
{
FAR struct hostfs_mountpt_s *fs;
char path[HOSTFS_MAX_PATH];
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
fs = mountpt->i_private;
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Append to the host's root directory */
hostfs_mkpath(fs, relpath, path, sizeof(path));
/* Call the host FS to do the mkdir */
ret = host_mkdir(path, mode);
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_rmdir
*
* Description: Remove a directory
*
****************************************************************************/
int hostfs_rmdir(FAR struct inode *mountpt, FAR const char *relpath)
{
FAR struct hostfs_mountpt_s *fs;
char path[HOSTFS_MAX_PATH];
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
fs = mountpt->i_private;
/* Take the lock */
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Append to the host's root directory */
hostfs_mkpath(fs, relpath, path, sizeof(path));
/* Call the host FS to do the mkdir */
ret = host_rmdir(path);
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_rename
*
* Description: Rename a file or directory
*
****************************************************************************/
int hostfs_rename(FAR struct inode *mountpt, FAR const char *oldrelpath,
FAR const char *newrelpath)
{
FAR struct hostfs_mountpt_s *fs;
char oldpath[HOSTFS_MAX_PATH];
char newpath[HOSTFS_MAX_PATH];
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
fs = mountpt->i_private;
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Append to the host's root directory */
strlcpy(oldpath, fs->fs_root, sizeof(oldpath));
strlcat(oldpath, oldrelpath, sizeof(oldpath));
strlcpy(newpath, fs->fs_root, sizeof(newpath));
strlcat(newpath, newrelpath, sizeof(newpath));
/* Call the host FS to do the mkdir */
ret = host_rename(oldpath, newpath);
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_stat
*
* Description: Return information about a file or directory
*
****************************************************************************/
static int hostfs_stat(FAR struct inode *mountpt, FAR const char *relpath,
FAR struct stat *buf)
{
FAR struct hostfs_mountpt_s *fs;
char path[HOSTFS_MAX_PATH];
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
fs = mountpt->i_private;
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Append to the host's root directory */
hostfs_mkpath(fs, relpath, path, sizeof(path));
/* Call the host FS to do the stat operation */
ret = host_stat(path, buf);
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Name: hostfs_chstat
*
* Description: Change information about a file or directory
*
****************************************************************************/
static int hostfs_chstat(FAR struct inode *mountpt, FAR const char *relpath,
FAR const struct stat *buf, int flags)
{
FAR struct hostfs_mountpt_s *fs;
char path[HOSTFS_MAX_PATH];
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
fs = mountpt->i_private;
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
return ret;
}
/* Append to the host's root directory */
hostfs_mkpath(fs, relpath, path, sizeof(path));
/* Call the host FS to do the chstat operation */
ret = host_chstat(path, buf, flags);
nxmutex_unlock(&g_lock);
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
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