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nuttx/fs/hostfs/hostfs.c
Jiuzhu Dong fe17f747a7 fs/directory: move private directory information to filesystem 
Signed-off-by: Jiuzhu Dong <dongjiuzhu1@xiaomi.com>
2022-08-09 23:30:01 +08:00

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/****************************************************************************
* fs/hostfs/hostfs.c
*
* 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 <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/fat.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/fs/hostfs.h>
#include "hostfs.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define HOSTFS_RETRY_DELAY_MS 10
/****************************************************************************
* 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, 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 uint8_t g_seminitialized = FALSE;
static sem_t g_sem;
/****************************************************************************
* 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 hostfs_operations =
{
hostfs_open, /* open */
hostfs_close, /* close */
hostfs_read, /* read */
hostfs_write, /* write */
hostfs_seek, /* seek */
hostfs_ioctl, /* ioctl */
hostfs_sync, /* sync */
hostfs_dup, /* dup */
hostfs_fstat, /* fstat */
hostfs_fchstat, /* fchstat */
hostfs_ftruncate, /* ftruncate */
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_semtake
****************************************************************************/
int hostfs_semtake(FAR struct hostfs_mountpt_s *fs)
{
return nxsem_wait_uninterruptible(fs->fs_sem);
}
/****************************************************************************
* Name: hostfs_semgive
****************************************************************************/
void hostfs_semgive(FAR struct hostfs_mountpt_s *fs)
{
nxsem_post(fs->fs_sem);
}
/****************************************************************************
* 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)
{
strncat(path, &relpath[first], pathlen - strlen(path) - 1);
}
}
/****************************************************************************
* 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];
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 semaphore */
ret = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Allocate memory for the open file */
hf = (struct hostfs_ofile_s *) kmm_malloc(sizeof *hf);
if (hf == NULL)
{
ret = -ENOMEM;
goto errout_with_semaphore;
}
/* 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 = -EBADF;
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 | O_WRONLY)) == (O_APPEND | O_WRONLY))
{
ret = host_lseek(hf->fd, 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;
fs->fs_head = hf;
ret = OK;
goto errout_with_semaphore;
errout_with_buffer:
kmm_free(hf);
errout_with_semaphore:
hostfs_semgive(fs);
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 && filep->f_inode != NULL);
/* Recover our private data from the struct file instance */
inode = filep->f_inode;
fs = inode->i_private;
hf = filep->f_priv;
/* Take the semaphore */
ret = hostfs_semtake(fs);
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;
kmm_free(hf);
okout:
hostfs_semgive(fs);
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 && filep->f_inode != 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 semaphore */
ret = hostfs_semtake(fs);
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;
}
hostfs_semgive(fs);
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 && filep->f_inode != 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 semaphore */
ret = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Test the permissions. Only allow write if the file was opened with
* write flags.
*/
if ((hf->oflags & O_WROK) == 0)
{
ret = -EACCES;
goto errout_with_semaphore;
}
/* Call the host to perform the write */
ret = host_write(hf->fd, buffer, buflen);
if (ret > 0)
{
filep->f_pos += ret;
}
errout_with_semaphore:
hostfs_semgive(fs);
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 && filep->f_inode != 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 semaphore */
ret = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Call our internal routine to perform the seek */
ret = host_lseek(hf->fd, offset, whence);
if (ret >= 0)
{
filep->f_pos = ret;
}
hostfs_semgive(fs);
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 && filep->f_inode != 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 semaphore */
ret = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Call our internal routine to perform the ioctl */
ret = host_ioctl(hf->fd, cmd, arg);
hostfs_semgive(fs);
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 && filep->f_inode != 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 semaphore */
ret = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
host_sync(hf->fd);
hostfs_semgive(fs);
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(filep != NULL && buf != NULL);
/* Recover our private data from the struct file instance */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
hf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the semaphore */
ret = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Call the host to perform the read */
ret = host_fstat(hf->fd, buf);
hostfs_semgive(fs);
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(filep != NULL && buf != NULL);
/* Recover our private data from the struct file instance */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
hf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the semaphore */
ret = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Call the host to perform the change */
ret = host_fchstat(hf->fd, buf, flags);
hostfs_semgive(fs);
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;
/* Sanity checks */
DEBUGASSERT(filep != NULL);
/* Recover our private data from the struct file instance */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
hf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the semaphore */
ret = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Call the host to perform the truncate */
ret = host_ftruncate(hf->fd, length);
hostfs_semgive(fs);
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 = kmm_zalloc(sizeof(struct hostfs_dir_s));
if (hdir == NULL)
{
return -ENOMEM;
}
/* Take the semaphore */
ret = hostfs_semtake(fs);
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_semaphore;
}
*dir = (FAR struct fs_dirent_s *)hdir;
hostfs_semgive(fs);
return OK;
errout_with_semaphore:
hostfs_semgive(fs);
errout_with_hdir:
kmm_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_mountpt_s *fs;
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 */
fs = mountpt->i_private;
hdir = (FAR struct hostfs_dir_s *)dir;
/* Take the semaphore */
ret = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Call the host's closedir function */
host_closedir(hdir->dir);
hostfs_semgive(fs);
kmm_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_mountpt_s *fs;
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 */
fs = mountpt->i_private;
hdir = (FAR struct hostfs_dir_s *)dir;
/* Take the semaphore */
ret = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Call the host OS's readdir function */
ret = host_readdir(hdir->dir, entry);
hostfs_semgive(fs);
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_mountpt_s *fs;
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 */
fs = mountpt->i_private;
hdir = (FAR struct hostfs_dir_s *)dir;
/* Take the semaphore */
ret = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Call the host and let it do all the work */
host_rewinddir(hdir->dir);
hostfs_semgive(fs);
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;
char *saveptr;
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 *)
kmm_zalloc(sizeof(struct hostfs_mountpt_s));
if (fs == NULL)
{
return -ENOMEM;
}
/* The options we support are:
* "fs=whatever", remote dir
*/
options = strdup(data);
if (!options)
{
kmm_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);
}
kmm_free(options);
/* If the global semaphore hasn't been initialized, then
* initialized it now.
*/
fs->fs_sem = &g_sem;
if (!g_seminitialized)
{
/* Initialize the semaphore that controls access */
nxsem_init(&g_sem, 0, 0);
g_seminitialized = TRUE;
}
else
{
/* Take the semaphore for the mount */
ret = hostfs_semtake(fs);
if (ret < 0)
{
kmm_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] != '/')
{
strcat(fs->fs_root, "/");
}
*handle = (FAR void *)fs;
hostfs_semgive(fs);
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 = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
if (fs->fs_head != NULL)
{
/* We cannot unmount now.. there are open files */
hostfs_semgive(fs);
/* This implementation currently only supports unmounting if there are
* no open file references.
*/
return (flags != 0) ? -ENOSYS : -EBUSY;
}
hostfs_semgive(fs);
kmm_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 = hostfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Call the host fs to perform the statfs */
memset(buf, 0, sizeof(struct statfs));
ret = host_statfs(fs->fs_root, buf);
buf->f_type = HOSTFS_MAGIC;
hostfs_semgive(fs);
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 = hostfs_semtake(fs);
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);
hostfs_semgive(fs);
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 = hostfs_semtake(fs);
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);
hostfs_semgive(fs);
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 semaphore */
ret = hostfs_semtake(fs);
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);
hostfs_semgive(fs);
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 = hostfs_semtake(fs);
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);
hostfs_semgive(fs);
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 = hostfs_semtake(fs);
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);
hostfs_semgive(fs);
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 = hostfs_semtake(fs);
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);
hostfs_semgive(fs);
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
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