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nuttx/fs/smartfs/smartfs_smart.c
Alin Jerpelea 231b8518b7 NuttX: Ken Pettit: update licenses to Apache 
Ken Pettit has submitted the ICLA and we can migrate the licenses
 to Apache.

Sebastien Lorquet has submitted the ICLA and we can migrate the licenses
 to Apache.

Gregory Nutt has submitted the SGA and we can migrate the licenses
 to Apache.

Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
2021-04-10 06:42:19 -05:00

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/****************************************************************************
* fs/smartfs/smartfs_smart.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/dirent.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/mtd/mtd.h>
#include <nuttx/fs/smart.h>
#include "smartfs.h"
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int smartfs_open(FAR struct file *filep, const char *relpath,
int oflags, mode_t mode);
static int smartfs_close(FAR struct file *filep);
static ssize_t smartfs_read(FAR struct file *filep, char *buffer,
size_t buflen);
static ssize_t smartfs_write(FAR struct file *filep, const char *buffer,
size_t buflen);
static off_t smartfs_seek(FAR struct file *filep, off_t offset,
int whence);
static int smartfs_ioctl(FAR struct file *filep, int cmd,
unsigned long arg);
static int smartfs_sync(FAR struct file *filep);
static int smartfs_dup(FAR const struct file *oldp,
FAR struct file *newp);
static int smartfs_fstat(FAR const struct file *filep,
FAR struct stat *buf);
static int smartfs_truncate(FAR struct file *filep, off_t length);
static int smartfs_opendir(FAR struct inode *mountpt,
FAR const char *relpath,
FAR struct fs_dirent_s *dir);
static int smartfs_readdir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir);
static int smartfs_rewinddir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir);
static int smartfs_bind(FAR struct inode *blkdriver,
FAR const void *data,
FAR void **handle);
static int smartfs_unbind(void *handle, FAR struct inode **blkdriver,
unsigned int flags);
static int smartfs_statfs(FAR struct inode *mountpt,
FAR struct statfs *buf);
static int smartfs_unlink(FAR struct inode *mountpt,
FAR const char *relpath);
static int smartfs_mkdir(FAR struct inode *mountpt,
FAR const char *relpath,
mode_t mode);
static int smartfs_rmdir(FAR struct inode *mountpt,
FAR const char *relpath);
static int smartfs_rename(FAR struct inode *mountpt,
FAR const char *oldrelpath,
const char *newrelpath);
static void smartfs_stat_common(FAR struct smartfs_mountpt_s *fs,
FAR struct smartfs_entry_s *entry,
FAR struct stat *buf);
static int smartfs_stat(FAR struct inode *mountpt,
FAR const char *relpath,
FAR struct stat *buf);
/****************************************************************************
* 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 smartfs_operations =
{
smartfs_open, /* open */
smartfs_close, /* close */
smartfs_read, /* read */
smartfs_write, /* write */
smartfs_seek, /* seek */
smartfs_ioctl, /* ioctl */
smartfs_sync, /* sync */
smartfs_dup, /* dup */
smartfs_fstat, /* fstat */
smartfs_truncate, /* truncate */
smartfs_opendir, /* opendir */
NULL, /* closedir */
smartfs_readdir, /* readdir */
smartfs_rewinddir, /* rewinddir */
smartfs_bind, /* bind */
smartfs_unbind, /* unbind */
smartfs_statfs, /* statfs */
smartfs_unlink, /* unlink */
smartfs_mkdir, /* mkdir */
smartfs_rmdir, /* rmdir */
smartfs_rename, /* rename */
smartfs_stat /* stat */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: smartfs_open
****************************************************************************/
static int smartfs_open(FAR struct file *filep, const char *relpath,
int oflags, mode_t mode)
{
struct inode *inode;
struct smartfs_mountpt_s *fs;
int ret;
uint16_t parentdirsector;
const char *filename;
struct smartfs_ofile_s *sf;
#ifdef CONFIG_SMARTFS_USE_SECTOR_BUFFER
struct smart_read_write_s readwrite;
#endif
/* 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 = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Locate the directory entry for this path */
sf = (struct smartfs_ofile_s *)kmm_malloc(sizeof *sf);
if (sf == NULL)
{
ret = -ENOMEM;
goto errout_with_semaphore;
}
/* Allocate a sector buffer if CRC enabled in the MTD layer */
#ifdef CONFIG_SMARTFS_USE_SECTOR_BUFFER
sf->buffer = (uint8_t *)kmm_malloc(fs->fs_llformat.availbytes);
if (sf->buffer == NULL)
{
/* Error ... no memory */
kmm_free(sf);
ret = -ENOMEM;
goto errout_with_semaphore;
}
sf->bflags = 0;
#endif /* CONFIG_SMARTFS_USE_SECTOR_BUFFER */
sf->entry.name = NULL;
ret = smartfs_finddirentry(fs, &sf->entry, relpath, &parentdirsector,
&filename);
/* Three possibilities: (1) a node exists for the relpath and
* dirinfo describes the directory entry of the entity, (2) the
* node does not exist, or (3) some error occurred.
*/
if (ret == OK)
{
/* The name exists -- but is is a file or a directory? */
if (sf->entry.flags & SMARTFS_DIRENT_TYPE_DIR)
{
/* Can't open a dir as a file! */
ret = -EISDIR;
goto errout_with_buffer;
}
/* It would be an error if we are asked to create it exclusively */
if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
{
/* Already exists -- can't create it exclusively */
ret = -EEXIST;
goto errout_with_buffer;
}
/* TODO: Test open mode based on the file mode */
/* If O_TRUNC is specified and the file is opened for writing,
* then truncate the file. This operation requires that the file
* is writeable. O_TRUNC without write access is ignored.
*/
if ((oflags & (O_TRUNC | O_WROK)) == (O_TRUNC | O_WROK))
{
/* Truncate the file as part of the open */
ret = smartfs_shrinkfile(fs, sf, 0);
if (ret < 0)
{
goto errout_with_buffer;
}
}
}
else if (ret == -ENOENT)
{
/* The file does not exist. Were we asked to create it? */
if ((oflags & O_CREAT) == 0)
{
/* No.. then we fail with -ENOENT */
ret = -ENOENT;
goto errout_with_buffer;
}
/* Yes... test if the parent directory is valid */
if (parentdirsector != 0xffff)
{
/* We can create in the given parent directory */
ret = smartfs_createentry(fs, parentdirsector, filename,
SMARTFS_DIRENT_TYPE_FILE, mode,
&sf->entry, 0xffff, sf);
if (ret != OK)
{
goto errout_with_buffer;
}
}
else
{
/* Trying to create in a directory that doesn't exist */
ret = -ENOENT;
goto errout_with_buffer;
}
}
else
{
goto errout_with_buffer;
}
/* Now perform the "open" on the file in direntry */
sf->oflags = oflags;
sf->crefs = 1;
sf->filepos = 0;
sf->curroffset = sizeof(struct smartfs_chain_header_s);
sf->currsector = sf->entry.firstsector;
sf->byteswritten = 0;
#ifdef CONFIG_SMARTFS_USE_SECTOR_BUFFER
/* When using sector buffering, current sector with its header should
* always be present in sf->buffer. Otherwise data corruption may arise
* when writing. However, this does not apply when overwriting without
* append mode.
*/
if ((sf->currsector != SMARTFS_ERASEDSTATE_16BIT) && (oflags & O_APPEND))
{
readwrite.logsector = sf->currsector;
readwrite.offset = 0;
readwrite.count = fs->fs_llformat.availbytes;
readwrite.buffer = (uint8_t *) sf->buffer;
ret = FS_IOCTL(fs, BIOC_READSECT, (unsigned long) &readwrite);
if (ret < 0)
{
ferr("ERROR: Error %d reading sector %d header\n",
ret, sf->currsector);
goto errout_with_buffer;
}
}
#endif
/* Test if we opened for APPEND mode. If we did, then seek to the
* end of the file.
*/
if (oflags & O_APPEND)
{
/* Perform the seek */
smartfs_seek_internal(fs, sf, 0, SEEK_END);
}
/* Attach the private date to the struct file instance */
filep->f_priv = sf;
/* 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).
*/
sf->fnext = fs->fs_head;
fs->fs_head = sf;
ret = OK;
goto errout_with_semaphore;
errout_with_buffer:
if (sf->entry.name != NULL)
{
/* Free the space for the name too */
kmm_free(sf->entry.name);
sf->entry.name = NULL;
}
#ifdef CONFIG_SMARTFS_USE_SECTOR_BUFFER
kmm_free(sf->buffer);
#endif /* CONFIG_SMARTFS_USE_SECTOR_BUFFER */
kmm_free(sf);
errout_with_semaphore:
smartfs_semgive(fs);
if (ret == -EINVAL)
{
ret = -EIO;
}
return ret;
}
/****************************************************************************
* Name: smartfs_close
****************************************************************************/
static int smartfs_close(FAR struct file *filep)
{
struct inode *inode;
struct smartfs_mountpt_s *fs;
struct smartfs_ofile_s *sf;
struct smartfs_ofile_s *nextfile;
struct smartfs_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;
sf = filep->f_priv;
/* Sync the file */
smartfs_sync(filep);
/* Take the semaphore */
ret = smartfs_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 (sf->crefs > 1)
{
/* The file is opened more than once. Just decrement the
* reference count and return.
*/
sf->crefs--;
goto okout;
}
/* Remove ourselves from the linked list */
nextfile = fs->fs_head;
prevfile = nextfile;
while ((nextfile != sf) && (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;
}
}
/* Now free the pointer */
filep->f_priv = NULL;
if (sf->entry.name != NULL)
{
/* Free the space for the name too */
kmm_free(sf->entry.name);
sf->entry.name = NULL;
}
#ifdef CONFIG_SMARTFS_USE_SECTOR_BUFFER
if (sf->buffer)
{
kmm_free(sf->buffer);
}
#endif
kmm_free(sf);
okout:
smartfs_semgive(fs);
return OK;
}
/****************************************************************************
* Name: smartfs_read
****************************************************************************/
static ssize_t smartfs_read(FAR struct file *filep, char *buffer,
size_t buflen)
{
struct inode *inode;
struct smartfs_mountpt_s *fs;
struct smartfs_ofile_s *sf;
struct smart_read_write_s readwrite;
struct smartfs_chain_header_s *header;
int ret = OK;
uint32_t bytesread;
uint16_t bytestoread;
uint16_t bytesinsector;
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover our private data from the struct file instance */
sf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the semaphore */
ret = smartfs_semtake(fs);
if (ret < 0)
{
return (ssize_t)ret;
}
/* Loop until all byte read or error */
bytesread = 0;
while (bytesread != buflen)
{
/* Test if we are at the end of data */
if (sf->currsector == SMARTFS_ERASEDSTATE_16BIT)
{
/* Break and return the number of bytes we read (may be zero) */
break;
}
/* Read the current sector into our buffer */
readwrite.logsector = sf->currsector;
readwrite.offset = 0;
readwrite.buffer = (uint8_t *) fs->fs_rwbuffer;
readwrite.count = fs->fs_llformat.availbytes;
ret = FS_IOCTL(fs, BIOC_READSECT, (unsigned long) &readwrite);
if (ret < 0)
{
ferr("ERROR: Error %d reading sector %d data\n",
ret, sf->currsector);
goto errout_with_semaphore;
}
/* Point header to the read data to get used byte count */
header = (struct smartfs_chain_header_s *) fs->fs_rwbuffer;
/* Get number of used bytes in this sector */
bytesinsector = *((uint16_t *) header->used);
if (bytesinsector == SMARTFS_ERASEDSTATE_16BIT)
{
/* No bytes to read from this sector */
bytesinsector = 0;
}
/* Calculate the number of bytes to read into the buffer */
bytestoread = bytesinsector - (sf->curroffset -
sizeof(struct smartfs_chain_header_s));
if (bytestoread + bytesread > buflen)
{
/* Truncate bytes to read based on buffer len */
bytestoread = buflen - bytesread;
}
/* Copy data to the read buffer */
if (bytestoread > 0)
{
/* Do incremental copy from this sector */
memcpy(&buffer[bytesread], &fs->fs_rwbuffer[sf->curroffset],
bytestoread);
bytesread += bytestoread;
sf->filepos += bytestoread;
sf->curroffset += bytestoread;
}
/* Test if we are at the end of the data in this sector */
if ((bytestoread == 0) ||
(sf->curroffset == fs->fs_llformat.availbytes))
{
/* Set the next sector as the current sector */
sf->currsector = SMARTFS_NEXTSECTOR(header);
sf->curroffset = sizeof(struct smartfs_chain_header_s);
/* Test if at end of data */
if (sf->currsector == SMARTFS_ERASEDSTATE_16BIT)
{
/* No more data! Return what we have */
break;
}
}
}
/* Return the number of bytes we read */
ret = bytesread;
errout_with_semaphore:
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Name: smartfs_write
****************************************************************************/
static ssize_t smartfs_write(FAR struct file *filep, const char *buffer,
size_t buflen)
{
struct inode *inode;
struct smartfs_mountpt_s *fs;
struct smartfs_ofile_s *sf;
struct smart_read_write_s readwrite;
struct smartfs_chain_header_s *header;
size_t byteswritten;
int ret;
/* Sanity checks. I have seen the following assertion misfire if
* CONFIG_DEBUG_MM is enabled while re-directing output to a
* file. In this case, the debug output can get generated while
* the file is being opened, FAT data structures are being allocated,
* and things are generally in a perverse state.
*/
#ifdef CONFIG_DEBUG_MM
if (filep->f_priv == NULL || filep->f_inode == NULL)
{
return -ENXIO;
}
#else
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
#endif
/* Recover our private data from the struct file instance */
sf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the semaphore */
ret = smartfs_semtake(fs);
if (ret < 0)
{
return (ssize_t)ret;
}
/* Test the permissions. Only allow write if the file was opened with
* write flags.
*/
if ((sf->oflags & O_WROK) == 0)
{
ret = -EACCES;
goto errout_with_semaphore;
}
/* Test if we opened for APPEND mode. If we did, then seek to the
* end of the file.
*/
if (sf->oflags & O_APPEND)
{
ret = smartfs_seek_internal(fs, sf, 0, SEEK_END);
if (ret < 0)
{
ret = -EIO;
goto errout_with_semaphore;
}
}
/* First test if we are overwriting an existing location or writing to
* a new one.
*/
header = (struct smartfs_chain_header_s *) fs->fs_rwbuffer;
byteswritten = 0;
while ((sf->filepos < sf->entry.datlen) && (buflen > 0))
{
/* Overwriting data caused by a seek, etc. In this case, we need
* to check if the write causes the file length to be extended
* or not and update it accordingly. We will write data up to
* the current end-of-file and then break, allowing the next while
* loop below to write the additional data to the end of the file.
*/
readwrite.offset = sf->curroffset;
readwrite.logsector = sf->currsector;
readwrite.buffer = (uint8_t *) &buffer[byteswritten];
readwrite.count = fs->fs_llformat.availbytes - sf->curroffset;
/* Limit the write based on available data to write */
if (readwrite.count > buflen)
{
readwrite.count = buflen;
}
/* Limit the write based on current file length */
if (readwrite.count > sf->entry.datlen - sf->filepos)
{
/* Limit the write length so we write to the current EOF. */
readwrite.count = sf->entry.datlen - sf->filepos;
}
/* Now perform the write. */
if (readwrite.count > 0)
{
ret = FS_IOCTL(fs, BIOC_WRITESECT, (unsigned long) &readwrite);
if (ret < 0)
{
ferr("ERROR: Error %d writing sector %d data\n",
ret, sf->currsector);
goto errout_with_semaphore;
}
/* Update our control variables */
sf->filepos += readwrite.count;
sf->curroffset += readwrite.count;
buflen -= readwrite.count;
byteswritten += readwrite.count;
}
/* Test if we wrote to the end of the current sector */
if (sf->curroffset == fs->fs_llformat.availbytes)
{
/* Wrote to the end of the sector. Update to point to the
* next sector for additional writes. First read the sector
* header to get the sector chain info.
*/
readwrite.offset = 0;
readwrite.buffer = (uint8_t *) fs->fs_rwbuffer;
readwrite.count = sizeof(struct smartfs_chain_header_s);
ret = FS_IOCTL(fs, BIOC_READSECT, (unsigned long) &readwrite);
if (ret < 0)
{
ferr("ERROR: Error %d reading sector %d header\n",
ret, sf->currsector);
goto errout_with_semaphore;
}
/* Now get the chained sector info and reset the offset */
sf->curroffset = sizeof(struct smartfs_chain_header_s);
sf->currsector = SMARTFS_NEXTSECTOR(header);
}
}
/* Now append data to end of the file. */
while (buflen > 0)
{
/* We will fill up the current sector. Write data to
* the current sector first.
*/
#ifdef CONFIG_SMARTFS_USE_SECTOR_BUFFER
readwrite.count = fs->fs_llformat.availbytes - sf->curroffset;
if (readwrite.count > buflen)
{
readwrite.count = buflen;
}
memcpy(&sf->buffer[sf->curroffset], &buffer[byteswritten],
readwrite.count);
sf->bflags |= SMARTFS_BFLAG_DIRTY;
#else /* CONFIG_SMARTFS_USE_SECTOR_BUFFER */
readwrite.offset = sf->curroffset;
readwrite.logsector = sf->currsector;
readwrite.buffer = (uint8_t *) &buffer[byteswritten];
readwrite.count = fs->fs_llformat.availbytes - sf->curroffset;
if (readwrite.count > buflen)
{
/* Limit the write base on remaining bytes to write */
readwrite.count = buflen;
}
/* Perform the write */
if (readwrite.count > 0)
{
ret = FS_IOCTL(fs, BIOC_WRITESECT, (unsigned long) &readwrite);
if (ret < 0)
{
ferr("ERROR: Error %d writing sector %d data\n",
ret, sf->currsector);
goto errout_with_semaphore;
}
}
#endif /* CONFIG_SMARTFS_USE_SECTOR_BUFFER */
/* Update our control variables */
sf->entry.datlen += readwrite.count;
sf->byteswritten += readwrite.count;
sf->filepos += readwrite.count;
sf->curroffset += readwrite.count;
buflen -= readwrite.count;
byteswritten += readwrite.count;
/* Test if we wrote a full sector of data */
#ifdef CONFIG_SMARTFS_USE_SECTOR_BUFFER
if (sf->curroffset == fs->fs_llformat.availbytes && buflen)
{
/* First get a new chained sector */
ret = FS_IOCTL(fs, BIOC_ALLOCSECT, 0xffff);
if (ret < 0)
{
ferr("ERROR: Error %d allocating new sector\n", ret);
goto errout_with_semaphore;
}
/* Copy the new sector to the old one and chain it */
header = (struct smartfs_chain_header_s *) sf->buffer;
*((uint16_t *) header->nextsector) = (uint16_t) ret;
/* Now sync the file to write this sector out */
ret = smartfs_sync_internal(fs, sf);
if (ret != OK)
{
goto errout_with_semaphore;
}
/* Record the new sector in our tracking variables and
* reset the offset to "zero".
*/
if (sf->currsector == SMARTFS_NEXTSECTOR(header))
{
/* Error allocating logical sector! */
ferr("ERROR: Duplicate logical sector %d\n", sf->currsector);
}
sf->bflags = SMARTFS_BFLAG_DIRTY;
sf->currsector = SMARTFS_NEXTSECTOR(header);
sf->curroffset = sizeof(struct smartfs_chain_header_s);
memset(sf->buffer, CONFIG_SMARTFS_ERASEDSTATE,
fs->fs_llformat.availbytes);
header->type = SMARTFS_DIRENT_TYPE_FILE;
}
#else /* CONFIG_SMARTFS_USE_SECTOR_BUFFER */
if (sf->curroffset == fs->fs_llformat.availbytes)
{
/* Sync the file to write this sector out */
ret = smartfs_sync_internal(fs, sf);
if (ret != OK)
{
goto errout_with_semaphore;
}
/* Allocate a new sector if needed */
if (buflen > 0)
{
/* Allocate a new sector */
ret = FS_IOCTL(fs, BIOC_ALLOCSECT, 0xffff);
if (ret < 0)
{
ferr("ERROR: Error %d allocating new sector\n", ret);
goto errout_with_semaphore;
}
/* Copy the new sector to the old one and chain it */
header = (struct smartfs_chain_header_s *) fs->fs_rwbuffer;
*((uint16_t *) header->nextsector) = (uint16_t) ret;
readwrite.offset = offsetof(struct smartfs_chain_header_s,
nextsector);
readwrite.buffer = (uint8_t *) header->nextsector;
readwrite.count = sizeof(uint16_t);
ret = FS_IOCTL(fs, BIOC_WRITESECT, (unsigned long) &readwrite);
if (ret < 0)
{
ferr("ERROR: Error %d writing next sector\n", ret);
goto errout_with_semaphore;
}
/* Record the new sector in our tracking variables and
* reset the offset to "zero".
*/
if (sf->currsector == SMARTFS_NEXTSECTOR(header))
{
/* Error allocating logical sector! */
ferr("ERROR: Duplicate logical sector %d\n",
sf->currsector);
}
sf->currsector = SMARTFS_NEXTSECTOR(header);
sf->curroffset = sizeof(struct smartfs_chain_header_s);
}
}
#endif /* CONFIG_SMARTFS_USE_SECTOR_BUFFER */
}
ret = byteswritten;
errout_with_semaphore:
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Name: smartfs_seek
****************************************************************************/
static off_t smartfs_seek(FAR struct file *filep, off_t offset, int whence)
{
struct inode *inode;
struct smartfs_mountpt_s *fs;
struct smartfs_ofile_s *sf;
int ret;
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover our private data from the struct file instance */
sf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the semaphore */
ret = smartfs_semtake(fs);
if (ret < 0)
{
return (off_t)ret;
}
/* Call our internal routine to perform the seek */
ret = smartfs_seek_internal(fs, sf, offset, whence);
if (ret >= 0)
{
filep->f_pos = ret;
}
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Name: smartfs_ioctl
****************************************************************************/
static int smartfs_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
/* We don't use any ioctls */
return -ENOSYS;
}
/****************************************************************************
* Name: smartfs_sync
*
* Description: Synchronize the file state on disk to match internal, in-
* memory state.
*
****************************************************************************/
static int smartfs_sync(FAR struct file *filep)
{
struct inode *inode;
struct smartfs_mountpt_s *fs;
struct smartfs_ofile_s *sf;
int ret;
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover our private data from the struct file instance */
sf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the semaphore */
ret = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
ret = smartfs_sync_internal(fs, sf);
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Name: smart_dup
*
* Description: Duplicate open file data in the new file structure.
*
****************************************************************************/
static int smartfs_dup(FAR const struct file *oldp, FAR struct file *newp)
{
struct smartfs_ofile_s *sf;
finfo("Dup %p->%p\n", oldp, newp);
/* 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: smartfs_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 smartfs_fstat(FAR const struct file *filep, FAR struct stat *buf)
{
FAR struct inode *inode;
FAR struct smartfs_mountpt_s *fs;
FAR struct smartfs_ofile_s *sf;
int ret;
DEBUGASSERT(filep != NULL && buf != NULL);
/* Recover our private data from the struct file instance */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
sf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the semaphore */
ret = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Return information about the directory entry in the stat structure */
smartfs_stat_common(fs, &sf->entry, buf);
smartfs_semgive(fs);
return OK;
}
/****************************************************************************
* Name: smartfs_truncate
*
* Description:
* Set the length of the open, regular file associated with the file
* structure 'filep' to 'length'.
*
****************************************************************************/
static int smartfs_truncate(FAR struct file *filep, off_t length)
{
FAR struct inode *inode;
FAR struct smartfs_mountpt_s *fs;
FAR struct smartfs_ofile_s *sf;
off_t oldsize;
int ret;
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover our private data from the struct file instance */
sf = filep->f_priv;
inode = filep->f_inode;
fs = inode->i_private;
DEBUGASSERT(fs != NULL);
/* Take the semaphore */
ret = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Test the permissions. Only allow truncation if the file was opened with
* write flags.
*/
if ((sf->oflags & O_WROK) == 0)
{
ret = -EACCES;
goto errout_with_semaphore;
}
/* Are we shrinking the file? Or extending it? */
oldsize = sf->entry.datlen;
if (oldsize == length)
{
/* Let's not and say we did */
ret = OK;
}
else if (oldsize > length)
{
/* We are shrinking the file */
ret = smartfs_shrinkfile(fs, sf, length);
}
else
{
/* Otherwise we are extending the file. This is essentially the same
* as a write except that (1) we write zeros and (2) we don't update
* the file position.
*/
ret = smartfs_extendfile(fs, sf, length);
}
errout_with_semaphore:
/* Relinquish exclusive access */
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Name: smartfs_opendir
*
* Description: Open a directory for read access
*
****************************************************************************/
static int smartfs_opendir(FAR struct inode *mountpt,
FAR const char *relpath,
FAR struct fs_dirent_s *dir)
{
struct smartfs_mountpt_s *fs;
int ret;
struct smartfs_entry_s entry;
uint16_t parentdirsector;
const char *filename;
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Recover our private data from the inode instance */
fs = mountpt->i_private;
/* Take the semaphore */
ret = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Search for the path on the volume */
entry.name = NULL;
ret = smartfs_finddirentry(fs, &entry, relpath, &parentdirsector,
&filename);
if (ret < 0)
{
goto errout_with_semaphore;
}
/* Populate our private data in the fs_dirent_s struct */
dir->u.smartfs.fs_firstsector = entry.firstsector;
dir->u.smartfs.fs_currsector = entry.firstsector;
dir->u.smartfs.fs_curroffset = sizeof(struct smartfs_chain_header_s);
ret = OK;
errout_with_semaphore:
/* If space for the entry name was allocated, then free it */
if (entry.name != NULL)
{
kmm_free(entry.name);
entry.name = NULL;
}
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Name: smartfs_readdir
*
* Description: Read the next directory entry
*
****************************************************************************/
static int smartfs_readdir(struct inode *mountpt, struct fs_dirent_s *dir)
{
struct smartfs_mountpt_s *fs;
int ret;
uint16_t entrysize;
uint16_t namelen;
struct smartfs_chain_header_s *header;
struct smart_read_write_s readwrite;
struct smartfs_entry_header_s *entry;
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Recover our private data from the inode instance */
fs = mountpt->i_private;
/* Take the semaphore */
ret = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Read sectors and search entries until one found or no more */
entrysize = sizeof(struct smartfs_entry_header_s) +
fs->fs_llformat.namesize;
while (dir->u.smartfs.fs_currsector != SMARTFS_ERASEDSTATE_16BIT)
{
/* Read the logical sector */
readwrite.logsector = dir->u.smartfs.fs_currsector;
readwrite.count = fs->fs_llformat.availbytes;
readwrite.buffer = (uint8_t *)fs->fs_rwbuffer;
readwrite.offset = 0;
ret = FS_IOCTL(fs, BIOC_READSECT, (unsigned long) &readwrite);
if (ret < 0)
{
goto errout_with_semaphore;
}
/* Now search for entries, starting at curroffset */
while (dir->u.smartfs.fs_curroffset < ret)
{
/* Point to next entry */
entry = (struct smartfs_entry_header_s *) &fs->fs_rwbuffer[
dir->u.smartfs.fs_curroffset];
/* Test if this entry is valid and active */
if (((entry->flags & SMARTFS_DIRENT_EMPTY) ==
(SMARTFS_ERASEDSTATE_16BIT & SMARTFS_DIRENT_EMPTY)) ||
((entry->flags & SMARTFS_DIRENT_ACTIVE) !=
(SMARTFS_ERASEDSTATE_16BIT & SMARTFS_DIRENT_ACTIVE)))
{
/* This entry isn't valid, skip it */
dir->u.smartfs.fs_curroffset += entrysize;
entry = (struct smartfs_entry_header_s *)
&fs->fs_rwbuffer[dir->u.smartfs.fs_curroffset];
continue;
}
/* Entry found! Report it */
if ((entry->flags & SMARTFS_DIRENT_TYPE) ==
SMARTFS_DIRENT_TYPE_DIR)
{
dir->fd_dir.d_type = DTYPE_DIRECTORY;
}
else
{
dir->fd_dir.d_type = DTYPE_FILE;
}
/* Copy the entry name to dirent */
namelen = fs->fs_llformat.namesize;
if (namelen > NAME_MAX)
{
namelen = NAME_MAX;
}
memset(dir->fd_dir.d_name, 0, namelen);
strncpy(dir->fd_dir.d_name, entry->name, namelen);
/* Now advance to the next entry */
dir->u.smartfs.fs_curroffset += entrysize;
if (dir->u.smartfs.fs_curroffset + entrysize >=
fs->fs_llformat.availbytes)
{
/* We advanced past the end of the sector. Go to next sector */
dir->u.smartfs.fs_curroffset =
sizeof(struct smartfs_chain_header_s);
header = (struct smartfs_chain_header_s *) fs->fs_rwbuffer;
dir->u.smartfs.fs_currsector = SMARTFS_NEXTSECTOR(header);
}
/* Now exit */
ret = OK;
goto errout_with_semaphore;
}
/* No more entries in this sector. Move on to next sector and
* continue the search. If no more sectors, then we are all
* done and will report ENOENT.
*/
header = (struct smartfs_chain_header_s *) fs->fs_rwbuffer;
dir->u.smartfs.fs_curroffset = sizeof(struct smartfs_chain_header_s);
dir->u.smartfs.fs_currsector = SMARTFS_NEXTSECTOR(header);
}
/* If we arrive here, then there are no more entries */
ret = -ENOENT;
errout_with_semaphore:
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Name: smartfs_rewindir
*
* Description: Reset directory read to the first entry
*
****************************************************************************/
static int smartfs_rewinddir(struct inode *mountpt, struct fs_dirent_s *dir)
{
int ret = OK;
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Reset the directory to the first entry */
dir->u.smartfs.fs_currsector = dir->u.smartfs.fs_firstsector;
dir->u.smartfs.fs_curroffset = sizeof(struct smartfs_chain_header_s);
return ret;
}
/****************************************************************************
* Name: smartfs_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 smartfs_bind(FAR struct inode *blkdriver, const void *data,
void **handle)
{
struct smartfs_mountpt_s *fs;
int ret;
/* Open the block driver */
if (!blkdriver || !blkdriver->u.i_bops)
{
return -ENODEV;
}
if (blkdriver->u.i_bops->open &&
blkdriver->u.i_bops->open(blkdriver) != OK)
{
return -ENODEV;
}
/* Create an instance of the mountpt state structure */
fs = (struct smartfs_mountpt_s *)
kmm_zalloc(sizeof(struct smartfs_mountpt_s));
if (!fs)
{
return -ENOMEM;
}
/* If the global semaphore hasn't been initialized, then
* initialized it now.
*/
fs->fs_sem = &g_sem;
if (!g_seminitialized)
{
nxsem_init(&g_sem, 0, 0); /* Initialize the semaphore that controls access */
g_seminitialized = TRUE;
}
else
{
/* Take the semaphore for the mount */
ret = smartfs_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_blkdriver = blkdriver; /* Save the block driver reference */
fs->fs_head = NULL;
/* Now perform the mount. */
ret = smartfs_mount(fs, true);
if (ret != 0)
{
smartfs_semgive(fs);
kmm_free(fs);
return ret;
}
*handle = (FAR void *)fs;
smartfs_semgive(fs);
return OK;
}
/****************************************************************************
* Name: smartfs_unbind
*
* Description: This implements the filesystem portion of the umount
* operation.
*
****************************************************************************/
static int smartfs_unbind(FAR void *handle, FAR struct inode **blkdriver,
unsigned int flags)
{
FAR struct smartfs_mountpt_s *fs = (FAR struct smartfs_mountpt_s *)handle;
int ret;
if (!fs)
{
return -EINVAL;
}
/* Check if there are sill any files opened on the filesystem. */
ret = OK; /* Assume success */
ret = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
if (fs->fs_head != NULL)
{
/* We cannot unmount now.. there are open files */
smartfs_semgive(fs);
/* This implementation currently only supports unmounting if there are
* no open file references.
*/
return (flags != 0) ? -ENOSYS : -EBUSY;
}
else
{
/* Unmount ... close the block driver */
ret = smartfs_unmount(fs);
}
smartfs_semgive(fs);
kmm_free(fs);
return ret;
}
/****************************************************************************
* Name: smartfs_statfs
*
* Description: Return filesystem statistics
*
****************************************************************************/
static int smartfs_statfs(struct inode *mountpt, struct statfs *buf)
{
struct smartfs_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 = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Implement the logic!! */
memset(buf, 0, sizeof(struct statfs));
buf->f_type = SMARTFS_MAGIC;
/* Re-request the low-level format info to update free blocks */
ret = FS_IOCTL(fs, BIOC_GETFORMAT, (unsigned long) &fs->fs_llformat);
buf->f_namelen = fs->fs_llformat.namesize;
buf->f_bsize = fs->fs_llformat.sectorsize;
buf->f_blocks = fs->fs_llformat.nsectors;
if (buf->f_blocks == 65535)
{
buf->f_blocks++;
}
buf->f_bfree = fs->fs_llformat.nfreesectors;
buf->f_bavail = fs->fs_llformat.nfreesectors;
buf->f_files = 0;
buf->f_ffree = fs->fs_llformat.nfreesectors;
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Name: smartfs_unlink
*
* Description: Remove a file
*
****************************************************************************/
static int smartfs_unlink(struct inode *mountpt, const char *relpath)
{
struct smartfs_mountpt_s *fs;
int ret;
struct smartfs_entry_s entry;
const char *filename;
uint16_t parentdirsector;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
fs = mountpt->i_private;
ret = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Locate the directory entry for this path */
entry.name = NULL;
ret = smartfs_finddirentry(fs, &entry, relpath, &parentdirsector,
&filename);
if (ret == OK)
{
/* The name exists -- validate it is a file, not a dir */
if ((entry.flags & SMARTFS_DIRENT_TYPE) == SMARTFS_DIRENT_TYPE_DIR)
{
ret = -EISDIR;
goto errout_with_semaphore;
}
/* TODO: Need to check permissions? */
/* Okay, we are clear to delete the file. Use the deleteentry
* routine.
*/
smartfs_deleteentry(fs, &entry);
}
else
{
/* Just report the error */
goto errout_with_semaphore;
}
ret = OK;
errout_with_semaphore:
if (entry.name != NULL)
{
kmm_free(entry.name);
}
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Name: smartfs_mkdir
*
* Description: Create a directory
*
****************************************************************************/
static int smartfs_mkdir(struct inode *mountpt, const char *relpath,
mode_t mode)
{
struct smartfs_mountpt_s *fs;
int ret;
struct smartfs_entry_s entry;
uint16_t parentdirsector;
const char *filename;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
fs = mountpt->i_private;
ret = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Locate the directory entry for this path */
entry.name = NULL;
ret = smartfs_finddirentry(fs, &entry, relpath, &parentdirsector,
&filename);
/* Three possibililities: (1) a node exists for the relpath and
* dirinfo describes the directory entry of the entity, (2) the
* node does not exist, or (3) some error occurred.
*/
if (ret == OK)
{
/* The name exists -- can't create */
ret = -EEXIST;
goto errout_with_semaphore;
}
else if (ret == -ENOENT)
{
/* It doesn't exist ... we can create it, but only if we have
* the right permissions and if the parentdirsector is valid.
*/
if (parentdirsector == 0xffff)
{
/* Invalid entry in the path (non-existent dir segment) */
goto errout_with_semaphore;
}
/* Check mode */
/* Create the directory */
ret = smartfs_createentry(fs, parentdirsector, filename,
SMARTFS_DIRENT_TYPE_DIR, mode, &entry, 0xffff, NULL);
if (ret != OK)
{
goto errout_with_semaphore;
}
ret = OK;
}
errout_with_semaphore:
if (entry.name != NULL)
{
/* Free the filename space allocation */
kmm_free(entry.name);
entry.name = NULL;
}
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Name: smartfs_rmdir
*
* Description: Remove a directory
*
****************************************************************************/
int smartfs_rmdir(struct inode *mountpt, const char *relpath)
{
struct smartfs_mountpt_s *fs;
int ret;
struct smartfs_entry_s entry;
const char *filename;
uint16_t parentdirsector;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
fs = mountpt->i_private;
/* Take the semaphore */
ret = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Locate the directory entry for this path */
entry.name = NULL;
ret = smartfs_finddirentry(fs, &entry, relpath, &parentdirsector,
&filename);
if (ret == OK)
{
/* The name exists -- validate it is a dir, not a file */
if ((entry.flags & SMARTFS_DIRENT_TYPE) == SMARTFS_DIRENT_TYPE_FILE)
{
ret = -ENOTDIR;
goto errout_with_semaphore;
}
/* TODO: Need to check permissions? */
/* Check if the directory is empty */
ret = smartfs_countdirentries(fs, &entry);
if (ret < 0)
{
goto errout_with_semaphore;
}
/* Only continue if there are zero entries in the directory */
if (ret != 0)
{
ret = -ENOTEMPTY;
goto errout_with_semaphore;
}
/* Okay, we are clear to delete the directory. Use the deleteentry
* routine.
*/
ret = smartfs_deleteentry(fs, &entry);
if (ret < 0)
{
goto errout_with_semaphore;
}
}
else
{
/* Just report the error */
goto errout_with_semaphore;
}
ret = OK;
errout_with_semaphore:
if (entry.name != NULL)
{
kmm_free(entry.name);
}
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Name: smartfs_rename
*
* Description: Rename a file or directory
*
****************************************************************************/
int smartfs_rename(struct inode *mountpt, const char *oldrelpath,
const char *newrelpath)
{
struct smartfs_mountpt_s *fs;
int ret;
struct smartfs_entry_s oldentry;
uint16_t oldparentdirsector;
const char *oldfilename;
struct smartfs_entry_s newentry;
uint16_t newparentdirsector;
const char *newfilename;
mode_t mode;
uint16_t type;
struct smartfs_entry_header_s *direntry;
struct smart_read_write_s readwrite;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
fs = mountpt->i_private;
ret = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Search for old entry to validate it exists */
oldentry.name = NULL;
newentry.name = NULL;
ret = smartfs_finddirentry(fs, &oldentry, oldrelpath, &oldparentdirsector,
&oldfilename);
if (ret < 0)
{
goto errout_with_semaphore;
}
/* Search for the new entry and validate it DOESN'T exist. */
ret = smartfs_finddirentry(fs, &newentry, newrelpath, &newparentdirsector,
&newfilename);
if (ret == OK)
{
/* It is an error if the directory entry at newrelpath already
* exists. The necessary steps to avoid this case should have been
* handled by higher level logic in the VFS.
*/
ret = -EEXIST;
goto errout_with_semaphore;
}
/* Test if the new parent directory is valid */
if (newparentdirsector != 0xffff)
{
/* We can move to the given parent directory */
mode = oldentry.flags & SMARTFS_DIRENT_MODE;
type = oldentry.flags & SMARTFS_DIRENT_TYPE;
ret = smartfs_createentry(fs, newparentdirsector, newfilename,
type, mode, &newentry, oldentry.firstsector,
NULL);
if (ret != OK)
{
goto errout_with_semaphore;
}
/* Now mark the old entry as inactive */
readwrite.logsector = oldentry.dsector;
readwrite.offset = 0;
readwrite.count = fs->fs_llformat.availbytes;
readwrite.buffer = (uint8_t *) fs->fs_rwbuffer;
ret = FS_IOCTL(fs, BIOC_READSECT, (unsigned long) &readwrite);
if (ret < 0)
{
ferr("ERROR: Error %d reading sector %d data\n",
ret, oldentry.dsector);
goto errout_with_semaphore;
}
direntry = (struct smartfs_entry_header_s *)
&fs->fs_rwbuffer[oldentry.doffset];
#if CONFIG_SMARTFS_ERASEDSTATE == 0xff
direntry->flags &= ~SMARTFS_DIRENT_ACTIVE;
#else
direntry->flags |= SMARTFS_DIRENT_ACTIVE;
#endif
/* Now write the updated flags back to the device */
readwrite.offset = oldentry.doffset;
readwrite.count = sizeof(direntry->flags);
readwrite.buffer = (uint8_t *) &direntry->flags;
ret = FS_IOCTL(fs, BIOC_WRITESECT, (unsigned long) &readwrite);
if (ret < 0)
{
ferr("ERROR: Error %d writing flag bytes for sector %d\n",
ret, readwrite.logsector);
goto errout_with_semaphore;
}
}
else
{
/* Trying to create in a directory that doesn't exist */
ret = -ENOENT;
goto errout_with_semaphore;
}
ret = OK;
errout_with_semaphore:
if (oldentry.name != NULL)
{
kmm_free(oldentry.name);
oldentry.name = NULL;
}
if (newentry.name != NULL)
{
kmm_free(newentry.name);
newentry.name = NULL;
}
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Name: smartfs_stat_common
*
* Description:
* Return information about a directory entry
*
****************************************************************************/
static void smartfs_stat_common(FAR struct smartfs_mountpt_s *fs,
FAR struct smartfs_entry_s *entry,
FAR struct stat *buf)
{
/* Initialize the stat structure */
memset(buf, 0, sizeof(struct stat));
if (entry->firstsector == fs->fs_rootsector)
{
/* It's directory name of the mount point */
buf->st_mode = S_IFDIR | S_IROTH | S_IRGRP | S_IRUSR | S_IWOTH |
S_IWGRP | S_IWUSR;
}
else
{
/* Mask out the file type */
buf->st_mode = entry->flags & ~S_IFMT;
/* Add the file type based on the SmartFS entry flags */
if ((entry->flags & SMARTFS_DIRENT_TYPE) == SMARTFS_DIRENT_TYPE_DIR)
{
buf->st_mode |= S_IFDIR;
}
else
{
buf->st_mode |= S_IFREG;
}
buf->st_size = entry->datlen;
buf->st_blksize = fs->fs_llformat.availbytes;
buf->st_blocks = (buf->st_size + buf->st_blksize - 1) /
buf->st_blksize;
}
}
/****************************************************************************
* Name: smartfs_stat
*
* Description:
* Return information about a file or directory
*
****************************************************************************/
static int smartfs_stat(FAR struct inode *mountpt, FAR const char *relpath,
FAR struct stat *buf)
{
FAR struct smartfs_mountpt_s *fs;
FAR struct smartfs_entry_s entry;
FAR const char *filename;
uint16_t parentdirsector;
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the inode structure */
fs = mountpt->i_private;
ret = smartfs_semtake(fs);
if (ret < 0)
{
return ret;
}
/* Find the directory entry corresponding to relpath */
entry.name = NULL;
ret = smartfs_finddirentry(fs, &entry, relpath, &parentdirsector,
&filename);
if (ret < 0)
{
goto errout_with_semaphore;
}
/* Return information about the directory entry in the stat structure */
smartfs_stat_common(fs, &entry, buf);
ret = OK;
errout_with_semaphore:
if (entry.name != NULL)
{
kmm_free(entry.name);
entry.name = NULL;
}
smartfs_semgive(fs);
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
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