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incubator-nuttx/fs/smartfs/smartfs_procfs.c

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/****************************************************************************
* fs/smartfs/smartfs_procfs.c
*
* Copyright (C) 2013-2014 Ken Pettit. All rights reserved.
* Author: Ken Pettit <pettitkd@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/statfs.h>
#include <sys/stat.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/sched.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/procfs.h>
#include <nuttx/fs/dirent.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/mtd/smart.h>
#include <arch/irq.h>
#include "smartfs.h"
#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_EXCLUDE_SMARTFS)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/* This enumeration identifies all of the thread attributes that can be
* accessed via the procfs file system.
*/
/* Level 1 is the directory of attributes */
struct smartfs_level1_s
{
struct procfs_dir_priv_s base; /* Base directory private data */
/* Add context specific data types here for managing the directory
* open / read / stat, etc.
*/
FAR struct smartfs_mountpt_s *mount;
uint8_t direntry;
};
/* This structure describes one open "file" */
struct smartfs_file_s
{
struct procfs_file_s base; /* Base open file structure */
/* Add context specific data types for managing an open file here */
struct smartfs_level1_s level1; /* Reference to item being accessed */
uint16_t offset;
};
struct smartfs_procfs_entry_s
{
const char *name; /* Name of the directory entry */
size_t (*read)(FAR struct file *filep, FAR char *buffer, size_t buflen);
ssize_t (*write)(FAR struct file *filep, FAR const char *buffer, size_t buflen);
uint8_t type;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* File system methods */
static int smartfs_open(FAR struct file *filep, FAR 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, FAR char *buffer,
size_t buflen);
static ssize_t smartfs_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
static int smartfs_dup(FAR const struct file *oldp,
FAR struct file *newp);
static int smartfs_opendir(const char *relpath, FAR struct fs_dirent_s *dir);
static int smartfs_closedir(FAR struct fs_dirent_s *dir);
static int smartfs_readdir(FAR struct fs_dirent_s *dir);
static int smartfs_rewinddir(FAR struct fs_dirent_s *dir);
static int smartfs_stat(FAR const char *relpath, FAR struct stat *buf);
static ssize_t smartfs_debug_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
static size_t smartfs_status_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
#ifdef CONFIG_MTD_SMART_ALLOC_DEBUG
static size_t smartfs_mem_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
#endif
#ifdef CONFIG_MTD_SMART_SECTOR_ERASE_DEBUG
static size_t smartfs_erasemap_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
#endif
#ifdef CONFIG_SMARTFS_FILE_SECTOR_DEBUG
static size_t smartfs_files_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
static const struct smartfs_procfs_entry_s g_direntry[] =
{
{ "debuglevel", NULL, smartfs_debug_write, DTYPE_FILE },
#ifdef CONFIG_MTD_SMART_SECTOR_ERASE_DEBUG
{ "erasemap", smartfs_erasemap_read, NULL, DTYPE_FILE },
#endif
#ifdef CONFIG_MTD_SMART_ALLOC_DEBUG
{ "mem", smartfs_mem_read, NULL, DTYPE_FILE },
#endif
{ "status", smartfs_status_read, NULL, DTYPE_FILE }
};
static const uint8_t g_direntrycount = sizeof(g_direntry) /
sizeof(struct smartfs_procfs_entry_s);
/****************************************************************************
* Public Data
****************************************************************************/
/* See include/nutts/fs/procfs.h
* We use the old-fashioned kind of initializers so that this will compile
* with any compiler.
*/
const struct procfs_operations smartfs_procfsoperations =
{
smartfs_open, /* open */
smartfs_close, /* close */
smartfs_read, /* read */
/* No write supported */
smartfs_write, /* write */
smartfs_dup, /* dup */
smartfs_opendir, /* opendir */
smartfs_closedir, /* closedir */
smartfs_readdir, /* readdir */
smartfs_rewinddir, /* rewinddir */
smartfs_stat /* stat */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: smartfs_find_dirref
*
* Description:
* Analyse relpath to find the directory reference entry it represents,
* if any.
*
****************************************************************************/
static int smartfs_find_dirref(FAR const char *relpath,
FAR struct smartfs_level1_s *level1)
{
int ret = -ENOENT;
FAR struct smartfs_mountpt_s *mount;
uint16_t x;
FAR char * str;
mount = smartfs_get_first_mount();
/* Skip the "fs/smartfs" portion of relpath */
if (strncmp(relpath, "fs/smartfs", 10) == 0)
{
relpath += 10;
}
if (relpath[0] == '/')
{
relpath++;
}
/* Now test if doing a full dir listing of fs/smartfs */
if (relpath[0] == '\0')
{
/* Save the mount as the first one to display */
level1->mount = mount;
level1->base.level = 1;
level1->base.nentries = 0;
while (mount != NULL)
{
level1->base.nentries++;
mount = mount->fs_next;
}
level1->base.index = 0;
ret = OK;
}
else
{
/* Search for the requested entry */
str = strchr(relpath, '/');
if (str)
{
x = str - relpath;
}
else
{
x = strlen(relpath);
}
while (mount)
{
if (strncmp(mount->fs_blkdriver->i_name, relpath, x) == 0)
{
/* Found the mount point. Just break */
break;
}
/* Try the next mount */
mount = mount->fs_next;
}
if (mount)
{
/* Save the mount and skip it in the relpath */
ret = OK;
level1->mount = mount;
relpath += strlen(mount->fs_blkdriver->i_name);
if (relpath[0] == '/')
{
relpath++;
}
/* Test if a level 3 directory entry being requested or not */
if (relpath[0] == '\0')
{
/* Requesting directory listing of a specific SMARTFS mount or entry */
level1->base.level = 2;
level1->base.nentries = g_direntrycount;
level1->base.index = 0;
}
else
{
/* Find the level 3 directory entry */
level1->base.level = 3;
level1->base.nentries = 1;
level1->base.index = 0;
level1->direntry = 0;
while (level1->direntry < g_direntrycount)
{
/* Test if this entry matches */
if (strcmp(relpath, g_direntry[level1->direntry].name) == 0)
{
break;
}
/* Advance to next entry */
level1->direntry++;
}
/* Test if entry found or not */
if (level1->direntry == g_direntrycount)
{
ret = -ENOENT;
}
}
}
}
return ret;
}
/****************************************************************************
* Name: smartfs_open
****************************************************************************/
static int smartfs_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode)
{
FAR struct smartfs_file_s *priv;
int ret;
finfo("Open '%s'\n", relpath);
/* PROCFS is read-only. Any attempt to open with any kind of write
* access is not permitted.
*
* REVISIT: Write-able proc files could be quite useful.
*/
if (((oflags & O_WRONLY) != 0 || (oflags & O_RDONLY) == 0) &&
(smartfs_procfsoperations.write == NULL))
{
ferr("ERROR: Only O_RDONLY supported\n");
return -EACCES;
}
/* Allocate a container to hold the task and attribute selection */
priv = (FAR struct smartfs_file_s *)kmm_malloc(sizeof(struct smartfs_file_s));
if (!priv)
{
ferr("ERROR: Failed to allocate file attributes\n");
return -ENOMEM;
}
/* Find the directory entry being opened */
ret = smartfs_find_dirref(relpath, &priv->level1);
if (ret == -ENOENT)
{
/* Entry not found */
kmm_free(priv);
return ret;
}
priv->offset = 0;
/* Save the index as the open-specific state in filep->f_priv */
filep->f_priv = (FAR void *)priv;
return OK;
}
/****************************************************************************
* Name: smartfs_close
****************************************************************************/
static int smartfs_close(FAR struct file *filep)
{
FAR struct smartfs_file_s *priv;
/* Recover our private data from the struct file instance */
priv = (FAR struct smartfs_file_s *)filep->f_priv;
DEBUGASSERT(priv);
/* Release the file attributes structure */
kmm_free(priv);
filep->f_priv = NULL;
return OK;
}
/****************************************************************************
* Name: smartfs_read
****************************************************************************/
static ssize_t smartfs_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct smartfs_file_s *priv;
ssize_t ret;
finfo("buffer=%p buflen=%d\n", buffer, (int)buflen);
/* Recover our private data from the struct file instance */
priv = (FAR struct smartfs_file_s *)filep->f_priv;
DEBUGASSERT(priv);
/* Perform the read based on the directory entry */
ret = 0;
if (priv->level1.base.level == 3)
{
if (priv->level1.direntry < g_direntrycount)
{
if (g_direntry[priv->level1.direntry].read)
{
ret = g_direntry[priv->level1.direntry].read(filep, buffer, buflen);
}
}
}
/* Update the file offset */
if (ret > 0)
{
filep->f_pos += ret;
}
return ret;
}
/****************************************************************************
* Name: smartfs_write
****************************************************************************/
static ssize_t smartfs_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
FAR struct smartfs_file_s *priv;
ssize_t ret;
/* Recover our private data from the struct file instance */
priv = (FAR struct smartfs_file_s *)filep->f_priv;
DEBUGASSERT(priv);
/* Perform the write based on the directory entry */
ret = 0;
if (priv->level1.base.level == 3)
{
if (priv->level1.direntry < g_direntrycount)
{
if (g_direntry[priv->level1.direntry].write)
{
ret = g_direntry[priv->level1.direntry].write(filep, buffer, buflen);
}
}
}
/* Update the file offset */
if (ret > 0)
{
filep->f_pos += ret;
}
return ret;
}
/****************************************************************************
* Name: smartfs_dup
*
* Description:
* Duplicate open file data in the new file structure.
*
****************************************************************************/
static int smartfs_dup(FAR const struct file *oldp, FAR struct file *newp)
{
FAR struct smartfs_file_s *oldpriv;
FAR struct smartfs_file_s *newpriv;
finfo("Dup %p->%p\n", oldp, newp);
/* Recover our private data from the old struct file instance */
oldpriv = (FAR struct smartfs_file_s *)oldp->f_priv;
DEBUGASSERT(oldpriv);
/* Allocate a new container to hold the task and attribute selection */
newpriv = (FAR struct smartfs_file_s *)kmm_malloc(sizeof(struct smartfs_file_s));
if (!newpriv)
{
ferr("ERROR: Failed to allocate file attributes\n");
return -ENOMEM;
}
/* The copy the file attribute from the old attributes to the new */
memcpy(newpriv, oldpriv, sizeof(struct smartfs_file_s));
/* Save the new attributes in the new file structure */
newp->f_priv = (FAR void *)newpriv;
return OK;
}
/****************************************************************************
* Name: smartfs_opendir
*
* Description:
* Open a directory for read access
*
****************************************************************************/
static int smartfs_opendir(FAR const char *relpath, FAR struct fs_dirent_s *dir)
{
FAR struct smartfs_level1_s *level1;
int ret;
finfo("relpath: \"%s\"\n", relpath ? relpath : "NULL");
DEBUGASSERT(relpath && dir && !dir->u.procfs);
/* The path refers to the 1st level subdirectory. Allocate the level1
* dirent structure.
*/
level1 = (FAR struct smartfs_level1_s *)
kmm_malloc(sizeof(struct smartfs_level1_s));
if (!level1)
{
ferr("ERROR: Failed to allocate the level1 directory structure\n");
return -ENOMEM;
}
/* Initialize base structure components */
ret = smartfs_find_dirref(relpath, level1);
if (ret == OK)
{
dir->u.procfs = (FAR void *) level1;
}
else
{
kmm_free(level1);
}
return ret;
}
/****************************************************************************
* Name: smartfs_closedir
*
* Description: Close the directory listing
*
****************************************************************************/
static int smartfs_closedir(FAR struct fs_dirent_s *dir)
{
FAR struct smartfs_level1_s *priv;
DEBUGASSERT(dir && dir->u.procfs);
priv = dir->u.procfs;
if (priv)
{
kmm_free(priv);
}
dir->u.procfs = NULL;
return OK;
}
/****************************************************************************
* Name: smartfs_readdir
*
* Description: Read the next directory entry
*
****************************************************************************/
static int smartfs_readdir(struct fs_dirent_s *dir)
{
FAR struct smartfs_level1_s *level1;
int ret, index;
DEBUGASSERT(dir && dir->u.procfs);
level1 = dir->u.procfs;
/* Have we reached the end of the directory */
index = level1->base.index;
if (index >= level1->base.nentries)
{
/* We signal the end of the directory by returning the special
* error -ENOENT
*/
finfo("Entry %d: End of directory\n", index);
ret = -ENOENT;
}
/* We are traversing a subdirectory of task attributes */
else
{
DEBUGASSERT(level1->base.level >= 1);
/* Test the type of directory listing */
if (level1->base.level == 1)
{
/* Listing the top level (mounted smartfs volumes) */
if (!level1->mount)
{
return -ENOENT;
}
dir->fd_dir.d_type = DTYPE_DIRECTORY;
strncpy(dir->fd_dir.d_name, level1->mount->fs_blkdriver->i_name,
NAME_MAX + 1);
/* Advance to next entry */
level1->base.index++;
level1->mount = level1->mount->fs_next;
}
else if (level1->base.level == 2)
{
/* Listing the contents of a specific mount */
dir->fd_dir.d_type = g_direntry[level1->base.index].type;
strncpy(dir->fd_dir.d_name, g_direntry[level1->base.index++].name,
NAME_MAX + 1);
}
else if (level1->base.level == 3)
{
/* Listing the contents of a specific entry */
dir->fd_dir.d_type = g_direntry[level1->base.index].type;
strncpy(dir->fd_dir.d_name, g_direntry[level1->direntry].name,
NAME_MAX + 1);
level1->base.index++;
}
/* Set up the next directory entry offset. NOTE that we could use the
* standard f_pos instead of our own private index.
*/
ret = OK;
}
return ret;
}
/****************************************************************************
* Name: smartfs_rewindir
*
* Description: Reset directory read to the first entry
*
****************************************************************************/
static int smartfs_rewinddir(struct fs_dirent_s *dir)
{
FAR struct smartfs_level1_s *priv;
DEBUGASSERT(dir && dir->u.procfs);
priv = dir->u.procfs;
priv->base.index = 0;
return OK;
}
/****************************************************************************
* Name: smartfs_stat
*
* Description: Return information about a file or directory
*
****************************************************************************/
static int smartfs_stat(const char *relpath, struct stat *buf)
{
int ret;
struct smartfs_level1_s level1;
/* Decide if the relpath is valid and if it is a file
* or a directory and set it's permissions.
*/
ret = smartfs_find_dirref(relpath, &level1);
buf->st_mode = S_IROTH | S_IRGRP | S_IRUSR;
if (ret == OK)
{
if (level1.base.level < 3)
{
buf->st_mode |= S_IFDIR;
}
else
{
/* The entry being stat'ed is lowest level */
if (g_direntry[level1.direntry].type == DTYPE_DIRECTORY)
{
buf->st_mode |= S_IFDIR;
}
else
{
buf->st_mode |= S_IFREG;
}
/* Test if the entry is writable */
if (g_direntry[level1.direntry].write != NULL)
{
buf->st_mode |= S_IWOTH | S_IWGRP | S_IWUSR;
}
}
}
/* File/directory size, access block size */
buf->st_size = 0;
buf->st_blksize = 0;
buf->st_blocks = 0;
return ret;
}
/****************************************************************************
* Name: smartfs_debug_write
*
* Description: Performs the write operation for the "debug" file
*
****************************************************************************/
static ssize_t smartfs_debug_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
struct mtd_smart_debug_data_s debug_data;
FAR struct smartfs_file_s *priv;
priv = (FAR struct smartfs_file_s *) filep->f_priv;
/* Populate the debug_data structure */
debug_data.debugcmd = SMART_DEBUG_CMD_SET_DEBUG_LEVEL;
debug_data.debugdata = atoi(buffer);
priv->level1.mount->fs_blkdriver->u.i_bops->ioctl(
priv->level1.mount->fs_blkdriver, BIOC_DEBUGCMD,
(unsigned long) &debug_data);
return buflen;
}
/****************************************************************************
* Name: smartfs_status_read
*
* Description: Performs the read operation for the "status" dir entry.
*
****************************************************************************/
static size_t smartfs_status_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
struct mtd_smart_procfs_data_s procfs_data;
FAR struct smartfs_file_s *priv;
int ret;
size_t len;
int utilization;
priv = (FAR struct smartfs_file_s *) filep->f_priv;
/* Initialize the read length to zero and test if we are at the
* end of the file (i.e. already read the data.
*/
len = 0;
if (priv->offset == 0)
{
/* Get the ProcFS data from the block driver */
ret = priv->level1.mount->fs_blkdriver->u.i_bops->ioctl(
priv->level1.mount->fs_blkdriver, BIOC_GETPROCFSD,
(unsigned long) &procfs_data);
if (ret == OK)
{
/* Calculate the sector utilization percentage */
if (procfs_data.blockerases == 0)
{
utilization = 100;
}
else
{
utilization = 100 * (procfs_data.blockerases *
procfs_data.sectorsperblk -
procfs_data.unusedsectors) /
(procfs_data.blockerases *
procfs_data.sectorsperblk);
}
/* Format and return data in the buffer */
len = snprintf(buffer, buflen, "Format version: %d\nName Len: %d\n"
"Total Sectors: %d\nSector Size: %d\n"
"Format Sector: %d\nDir Sector: %d\n"
"Free Sectors: %d\nReleased Sectors: %d\n"
"Unused Sectors: %d\nBlock Erases: %d\n"
"Sectors Per Block: %d\nSector Utilization:%d%%\n"
#ifdef CONFIG_MTD_SMART_WEAR_LEVEL
"Uneven Wear Count: %d\n"
#endif
,
procfs_data.formatversion, procfs_data.namelen,
procfs_data.totalsectors, procfs_data.sectorsize,
procfs_data.formatsector, procfs_data.dirsector,
procfs_data.freesectors, procfs_data.releasesectors,
procfs_data.unusedsectors, procfs_data.blockerases,
procfs_data.sectorsperblk, utilization
#ifdef CONFIG_MTD_SMART_WEAR_LEVEL
, procfs_data.uneven_wearcount
#endif
);
}
/* Indicate we have already provided all the data */
priv->offset = 0xff;
}
return len;
}
/****************************************************************************
* Name: smartfs_mem_read
*
* Description: Performs the read operation for the "mem" dir entry.
*
****************************************************************************/
#ifdef CONFIG_MTD_SMART_ALLOC_DEBUG
static size_t smartfs_mem_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
struct mtd_smart_procfs_data_s procfs_data;
FAR struct smartfs_file_s *priv;
int ret;
uint16_t x;
size_t len, total;
priv = (FAR struct smartfs_file_s *) filep->f_priv;
/* Initialize the read length to zero and test if we are at the
* end of the file (i.e. already read the data.
*/
len = 0;
if (priv->offset == 0)
{
/* Get the ProcFS data from the block driver */
ret = priv->level1.mount->fs_blkdriver->u.i_bops->ioctl(
priv->level1.mount->fs_blkdriver, BIOC_GETPROCFSD,
(unsigned long) &procfs_data);
if (ret == OK)
{
/* Print the allocations to the buffer */
total = 0;
len = snprintf(buffer, buflen, "Allocations:\n");
buflen -= len;
for (x = 0; x < procfs_data.alloccount; x++)
{
/* Only print allocations with a non-NULL pointer */
if (procfs_data.allocs[x].ptr != NULL)
{
len += snprintf(&buffer[len], buflen - len, " %s: %d\n",
procfs_data.allocs[x].name, procfs_data.allocs[x].size);
total += procfs_data.allocs[x].size;
}
}
/* Add the total allocation amount to the buffer */
len += snprintf(&buffer[len], buflen - len, "\nTotal: %d\n", total);
}
/* Indicate we have done the read */
priv->offset = 0xff;
}
return len;
}
#endif
/****************************************************************************
* Name: smartfs_erasemap_read
*
* Description: Performs the read operation for the "erase" dir entry.
*
****************************************************************************/
#ifdef CONFIG_MTD_SMART_SECTOR_ERASE_DEBUG
static size_t smartfs_erasemap_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
struct mtd_smart_procfs_data_s procfs_data;
FAR struct smartfs_file_s *priv;
int ret, rows, cols;
size_t x, y;
size_t len, copylen;
priv = (FAR struct smartfs_file_s *) filep->f_priv;
/* Get the ProcFS data from the block driver */
ret = priv->level1.mount->fs_blkdriver->u.i_bops->ioctl(
priv->level1.mount->fs_blkdriver, BIOC_GETPROCFSD,
(unsigned long) &procfs_data);
if (ret != OK)
{
return 0;
}
/* Initialize the read length to zero and test if we are at the
* end of the file (i.e. already read the data).
*/
len = 0;
rows = 32;
cols = procfs_data.neraseblocks / rows;
while (rows >= 4 && (cols < 64 || cols > 128))
{
rows >>= 1;
cols = procfs_data.neraseblocks / rows;
}
/* Continue sending data until everything sent. We add 'rows' below to
* account for the \n at the end of each line.
*/
if (priv->offset < procfs_data.neraseblocks + rows)
{
/* copylen keeps track of the current length. When it is
* equal to or greater than the offset, we start sending data
* again. Basically we are starting at the beginning each time
* and only sending where we left off and discarding the rest.
*/
copylen = 0;
for (y = 0; y < rows; y++)
{
for (x = 0; x < cols; x++)
{
/* Copy data to the buffer */
if (copylen >= priv->offset)
{
buffer[len++] = procfs_data.erasecounts[y * cols + x] + 'A';
priv->offset++;
if (len >= buflen)
{
return len;
}
}
copylen++;
}
/* Add a trailing \n */
if (copylen >= priv->offset)
{
buffer[len++] = '\n';
priv->offset++;
if (len >= buflen)
{
return len;
}
}
/* Terminate the string */
if (copylen >= priv->offset)
{
buffer[len++] = '\0';
priv->offset++;
}
copylen++;
}
}
return len;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
#endif /* CONFIG_FS_PROCFS && !CONFIG_FS_PROCFS_EXCLUDE_SMARTFS */
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