static int cpuload_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode)
{
FAR struct cpuload_file_s *attr;
fvdbg("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)
{
fdbg("ERROR: Only O_RDONLY supported\n");
return -EACCES;
}
/* "cpuload" is the only acceptable value for the relpath */
if (strcmp(relpath, "cpuload") != 0)
{
fdbg("ERROR: relpath is '%s'\n", relpath);
return -ENOENT;
}
/* Allocate a container to hold the file attributes */
attr = (FAR struct cpuload_file_s *)kmm_zalloc(sizeof(struct cpuload_file_s));
if (!attr)
{
fdbg("ERROR: Failed to allocate file attributes\n");
return -ENOMEM;
}
/* Save the attributes as the open-specific state in filep->f_priv */
filep->f_priv = (FAR void *)attr;
return OK;
}
static int romfs_close(FAR struct file *filep)
{
FAR struct romfs_mountpt_s *rm;
FAR struct romfs_file_s *rf;
int ret = OK;
fvdbg("Closing\n");
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover our private data from the struct file instance */
rf = filep->f_priv;
rm = filep->f_inode->i_private;
DEBUGASSERT(rm != NULL);
/* Do not check if the mount is healthy. We must support closing of
* the file even when there is healthy mount.
*/
/* Deallocate the memory structures created when the open method
* was called.
*
* Free the sector buffer that was used to manage partial sector
* accesses.
*/
if (!rm->rm_xipbase && rf->rf_buffer)
{
kfree(rf->rf_buffer);
}
/* Then free the file structure itself. */
kfree(rf);
filep->f_priv = NULL;
return ret;
}
static int lpc43_pagewrite(FAR struct lpc43_dev_s *priv, FAR uint8_t *dest,
FAR const uint8_t *src, size_t nbytes)
{
int result;
/* Write FLASH pages:
*
* dest - Specifies the first address to be programmed or erased, either in
* the SPIFI memory area or as a zero-based device address. It must
* be at an offset that is an exact multiple of the erase block size.
* length - The number of bytes to be programmed or erased
*/
priv->operands.dest = dest;
priv->operands.length = nbytes;
fvdbg("SPIFI_PROGRAM: src=%p dest=%p length=%d\n",
src, priv->operands.dest, priv->operands.length);
result = SPIFI_PROGRAM(priv, &priv->rom, src, &priv->operands);
if (result != 0)
{
fdbg("ERROR: SPIFI_PROGRAM failed: %05x\n", result);
return -EIO;
}
/* Verify the data that was written by comparing to the data visible in the
* SPIFI address space.
*/
#ifdef CONFIG_SPIFI_VERIFY
result = lpc43_verify(priv, dest, src, nbytes);
if (result != 0)
{
fdbg("ERROR: lpc43_verify failed: %05x\n", result);
return -EIO;
}
#endif
return OK;
}
static ssize_t procfs_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
FAR struct procfs_file_s *handler;
ssize_t ret = 0;
fvdbg("buffer=%p buflen=%d\n", buffer, (int)buflen);
/* Recover our private data from the struct file instance */
handler = (FAR struct procfs_file_s *)filep->f_priv;
DEBUGASSERT(handler);
/* Call the handler's read routine */
if (handler->procfsentry->ops->write)
{
ret = handler->procfsentry->ops->write(filep, buffer, buflen);
}
return ret;
}
int nxffs_opendir(FAR struct inode *mountpt, FAR const char *relpath,
FAR struct fs_dirent_s *dir)
{
struct nxffs_volume_s *volume;
int ret;
fvdbg("relpath: \"%s\"\n", relpath ? relpath : "NULL");
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Recover the file system state from the NuttX inode instance */
volume = mountpt->i_private;
ret = sem_wait(&volume->exclsem);
if (ret != OK)
{
goto errout;
}
/* The requested directory must be the volume-relative "root" directory */
if (relpath && relpath[0] != '\0')
{
ret = -ENOENT;
goto errout_with_semaphore;
}
/* Set the offset to the offset to the first valid inode */
dir->u.nxffs.nx_offset = volume->inoffset;
ret = OK;
errout_with_semaphore:
sem_post(&volume->exclsem);
errout:
return ret;
}
static void uart_pollnotify(FAR uart_dev_t *dev, pollevent_t eventset)
{
int i;
for (i = 0; i < CONFIG_SERIAL_NPOLLWAITERS; i++)
{
struct pollfd *fds = dev->fds[i];
if (fds)
{
#ifdef CONFIG_SERIAL_REMOVABLE
fds->revents |= ((fds->events | (POLLERR|POLLHUP)) & eventset);
#else
fds->revents |= (fds->events & eventset);
#endif
if (fds->revents != 0)
{
fvdbg("Report events: %02x\n", fds->revents);
sem_post(fds->sem);
}
}
}
}
static int tiva_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks)
{
#if !defined(CONFIG_QEMU_SRAM) && !defined(CONFIG_QEMU_SDRAM)
int curpage;
uint32_t pageaddr;
#endif
DEBUGASSERT(nblocks <= TIVA_VIRTUAL_NPAGES);
#if defined(CONFIG_QEMU_SRAM) || defined(CONFIG_QEMU_SDRAM)
/* Qemu doesnt implement tiva flash memory controller.
* Hence set the erase state to 0xFF using memset
*/
memset((void *)(TIVA_VIRTUAL_BASE + startblock * TIVA_FLASH_PAGESIZE), 0xFF, nblocks * TIVA_FLASH_PAGESIZE);
#else
for (curpage = startblock; curpage < nblocks; curpage++) {
pageaddr = TIVA_VIRTUAL_BASE + curpage * TIVA_FLASH_PAGESIZE;
fvdbg("Erase page at %08x\n", pageaddr);
/* set page address */
putreg32((pageaddr << FLASH_FMA_OFFSET_SHIFT) & FLASH_FMA_OFFSET_MASK, TIVA_FLASH_FMA);
/* set flash write key and erase bit */
putreg32(FLASH_FMC_WRKEY | FLASH_FMC_ERASE, TIVA_FLASH_FMC);
/* wait until erase has finished */
while (getreg32(TIVA_FLASH_FMC) & FLASH_FMC_ERASE) ;
}
#endif
return OK;
}
static void lpc43_cacheerase(struct lpc43_dev_s *priv, off_t sector)
{
FAR uint8_t *dest;
/* First, make sure that the erase block containing the 512 byte sector is in
* the cache.
*/
dest = lpc43_cacheread(priv, sector);
/* Erase the block containing this sector if it is not already erased.
* The erased indicated will be cleared when the data from the erase sector
* is read into the cache and set here when we erase the block.
*/
if (!IS_ERASED(priv))
{
off_t blkno = sector >> (SPIFI_BLKSHIFT - SPIFI_512SHIFT);
fvdbg("sector: %ld blkno: %d\n", sector, blkno);
lpc43_blockerase(priv, blkno);
SET_ERASED(priv);
}
static int skel_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode)
{
FAR struct skel_file_s *priv;
fvdbg("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) &&
(skel_procfsoperations.write == NULL))
{
fdbg("ERROR: Only O_RDONLY supported\n");
return -EACCES;
}
/* Allocate a container to hold the task and attribute selection */
priv = (FAR struct skel_file_s *)kmm_zalloc(sizeof(struct skel_file_s));
if (!priv)
{
fdbg("ERROR: Failed to allocate file attributes\n");
return -ENOMEM;
}
/* TODO: Initialize the context specific data here */
/* Save the index as the open-specific state in filep->f_priv */
filep->f_priv = (FAR void *)priv;
return OK;
}
int nxffs_statfs(FAR struct inode *mountpt, FAR struct statfs *buf)
{
FAR struct nxffs_volume_s *volume;
int ret;
fvdbg("Entry\n");
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private);
/* Get the mountpoint private data from the NuttX inode structure */
volume = mountpt->i_private;
ret = sem_wait(&volume->exclsem);
if (ret != OK)
{
goto errout;
}
/* Fill in the statfs info
*
* REVISIT: Need f_bfree, f_bavail, f_files, f_ffree calculation
*/
memset(buf, 0, sizeof(struct statfs));
buf->f_type = NXFFS_MAGIC;
buf->f_bsize = volume->geo.blocksize;
buf->f_blocks = volume->nblocks;
buf->f_namelen = volume->geo.blocksize - SIZEOF_NXFFS_BLOCK_HDR - SIZEOF_NXFFS_INODE_HDR;
ret = OK;
sem_post(&volume->exclsem);
errout:
return ret;
}
static void lpc43_blockerase(struct lpc43_dev_s *priv, off_t sector)
{
int result;
/* Erase one block on the chip:
*
* dest - Specifies the first address to be programmed or erased, either in
* the SPIFI memory area or as a zero-based device address. It must
* be at an offset that is an exact multiple of the erase block size.
* length - The number of bytes to be programmed or erased
*/
priv->operands.dest = SPIFI_BASE + (sector << SPIFI_BLKSHIFT);
priv->operands.length = SPIFI_BLKSIZE;
fvdbg("SPIFI_ERASE: dest=%p length=%d\n",
priv->operands.dest, priv->operands.length);
result = SPIFI_ERASE(priv, &priv->rom, &priv->operands);
if (result != 0)
{
fdbg("ERROR: SPIFI_ERASE failed: %05x\n", result);
}
}
static ssize_t skel_read(FAR struct file *filep, FAR char *buffer, size_t buflen)
{
FAR struct skel_file_s *priv;
ssize_t ret;
fvdbg("buffer=%p buflen=%d\n", buffer, (int)buflen);
/* Recover our private data from the struct file instance */
priv = (FAR struct skel_file_s *)filep->f_priv;
DEBUGASSERT(priv);
/* TODO: Provide the requested data */
ret = 0;
/* Update the file offset */
if (ret > 0) {
filep->f_pos += ret;
}
return ret;
}
int nxffs_nextblock(FAR struct nxffs_volume_s *volume, off_t offset,
FAR struct nxffs_blkentry_s *blkentry)
{
int nmagic;
int ch;
int nerased;
int ret;
/* Seek to the first FLASH offset provided by the caller. */
nxffs_ioseek(volume, offset);
/* Skip the block header */
if (volume->iooffset < SIZEOF_NXFFS_BLOCK_HDR)
{
volume->iooffset = SIZEOF_NXFFS_BLOCK_HDR;
}
/* Then begin searching */
nerased = 0;
nmagic = 0;
for (;;)
{
/* Read the next character */
ch = nxffs_getc(volume, SIZEOF_NXFFS_DATA_HDR - nmagic);
if (ch < 0)
{
fdbg("ERROR: nxffs_getc failed: %d\n", -ch);
return ch;
}
/* Check for another erased byte */
else if (ch == CONFIG_NXFFS_ERASEDSTATE)
{
/* If we have encountered NXFFS_NERASED number of consecutive
* erased bytes, then presume we have reached the end of valid
* data.
*/
if (++nerased >= NXFFS_NERASED)
{
fvdbg("No entry found\n");
return -ENOENT;
}
}
else
{
nerased = 0;
/* Check for the magic sequence indicating the start of an NXFFS
* data block or start of the next inode. There is the possibility
* of this magic sequnce occurring in FLASH data. However, the
* data block CRC should distinguish between real NXFFS data blocks
* headers and such false alarms.
*/
if (ch != g_datamagic[nmagic])
{
/* Ooops... this is the not the right character for the magic
* Sequence. Check if we need to restart or to cancel the sequence:
*/
if (ch == g_datamagic[0])
{
nmagic = 1;
}
else
{
nmagic = 0;
}
}
else if (nmagic < NXFFS_MAGICSIZE - 1)
{
/* We have one more character in the magic sequence */
nmagic++;
}
/* We have found the magic sequence in the FLASH data that may
* indicate the beginning of an NXFFS data block.
*/
else
{
/* The offset to the header must be 4 bytes before the current
* FLASH seek location.
*/
blkentry->hoffset = nxffs_iotell(volume) - NXFFS_MAGICSIZE;
/* Read the block header and verify the block at that address */
ret = nxffs_rdblkhdr(volume, blkentry->hoffset, &blkentry->datlen);
if (ret == OK)
{
fvdbg("Found a valid data block, offset: %d datlen: %d\n",
blkentry->hoffset, blkentry->datlen);
return OK;
}
/* False alarm.. Restore the volume cache position (that was
* destroyed by nxfs_rdblkhdr()) and keep looking.
*/
nxffs_ioseek(volume, blkentry->hoffset + NXFFS_MAGICSIZE);
nmagic = 0;
}
}
}
/* We won't get here, but to keep some compilers happy: */
return -ENOENT;
}
ssize_t nxffs_read(FAR struct file *filep, FAR char *buffer, size_t buflen)
{
FAR struct nxffs_volume_s *volume;
FAR struct nxffs_ofile_s *ofile;
struct nxffs_blkentry_s blkentry;
ssize_t total;
size_t available;
size_t readsize;
int ret;
fvdbg("Read %d bytes from offset %d\n", buflen, filep->f_pos);
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover the open file state from the struct file instance */
ofile = (FAR struct nxffs_ofile_s *)filep->f_priv;
/* Recover the volume state from the open file */
volume = (FAR struct nxffs_volume_s *)filep->f_inode->i_private;
DEBUGASSERT(volume != NULL);
/* Get exclusive access to the volume. Note that the volume exclsem
* protects the open file list.
*/
ret = sem_wait(&volume->exclsem);
if (ret != OK)
{
ret = -get_errno();
fdbg("ERROR: sem_wait failed: %d\n", ret);
goto errout;
}
/* Check if the file was opened with read access */
if ((ofile->oflags & O_RDOK) == 0)
{
fdbg("ERROR: File not open for read access\n");
ret = -EACCES;
goto errout_with_semaphore;
}
/* Loop until all bytes have been read */
for (total = 0; total < buflen; )
{
/* Don't seek past the end of the file */
if (filep->f_pos >= ofile->entry.datlen)
{
/* Return the partial read */
filep->f_pos = ofile->entry.datlen;
break;
}
/* Seek to the current file offset */
ret = nxffs_rdseek(volume, &ofile->entry, filep->f_pos, &blkentry);
if (ret < 0)
{
fdbg("ERROR: nxffs_rdseek failed: %d\n", -ret);
ret = -EACCES;
goto errout_with_semaphore;
}
/* How many bytes are available at this offset */
available = blkentry.datlen - blkentry.foffset;
/* Don't read more than we need to */
readsize = buflen - total;
if (readsize > available)
{
readsize = available;
}
/* Read data from that file offset */
memcpy(&buffer[total], &volume->cache[volume->iooffset], readsize);
/* Update the file offset */
filep->f_pos += readsize;
total += readsize;
}
sem_post(&volume->exclsem);
return total;
errout_with_semaphore:
sem_post(&volume->exclsem);
errout:
return (ssize_t)ret;
}
static int proc_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode)
{
FAR struct proc_file_s *procfile;
FAR const struct proc_node_s *node;
FAR struct tcb_s *tcb;
FAR char *ptr;
irqstate_t flags;
unsigned long tmp;
pid_t pid;
fvdbg("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)
{
fdbg("ERROR: Only O_RDONLY supported\n");
return -EACCES;
}
/* The first segment of the relative path should be a task/thread ID */
ptr = NULL;
tmp = strtoul(relpath, &ptr, 10);
if (!ptr || *ptr != '/')
{
fdbg("ERROR: Invalid path \"%s\"\n", relpath);
return -ENOENT;
}
/* Skip over the slash */
ptr++;
/* A valid PID would be in the range of 0-32767 (0 is reserved for the
* IDLE thread).
*/
if (tmp >= 32768)
{
fdbg("ERROR: Invalid PID %ld\n", tmp);
return -ENOENT;
}
/* Now verify that a task with this task/thread ID exists */
pid = (pid_t)tmp;
flags = irqsave();
tcb = sched_gettcb(pid);
irqrestore(flags);
if (!tcb)
{
fdbg("ERROR: PID %d is no longer valid\n", (int)pid);
return -ENOENT;
}
/* The remaining segments of the relpath should be a well known node in
* the task/thread tree.
*/
node = proc_findnode(ptr);
if (!node)
{
fdbg("ERROR: Invalid path \"%s\"\n", relpath);
return -ENOENT;
}
/* The node must be a file, not a directory */
if (node->dtype != DTYPE_FILE)
{
fdbg("ERROR: Path \"%s\" is a directory\n", relpath);
return -EISDIR;
}
/* Allocate a container to hold the task and node selection */
procfile = (FAR struct proc_file_s *)kzalloc(sizeof(struct proc_file_s));
if (!procfile)
{
fdbg("ERROR: Failed to allocate file container\n");
return -ENOMEM;
}
/* Initialize the file container */
procfile->pid = pid;
procfile->node = node;
/* Save the index as the open-specific state in filep->f_priv */
filep->f_priv = (FAR void *)procfile;
return OK;
}
static int procfs_readdir(struct inode *mountpt, struct fs_dirent_s *dir)
{
FAR struct procfs_dir_priv_s *priv;
FAR struct procfs_level0_s *level0;
FAR struct tcb_s *tcb;
FAR const char *name = NULL;
unsigned int index;
irqstate_t flags;
pid_t pid;
int ret = -ENOENT;
DEBUGASSERT(mountpt && dir && dir->u.procfs);
priv = dir->u.procfs;
/* Are we reading the 1st directory level with dynamic PID and static
* entries?
*/
if (priv->level == 0)
{
level0 = (FAR struct procfs_level0_s *)priv;
/* Have we reached the end of the PID information */
index = priv->index;
if (index >= priv->nentries)
{
/* We must report the next static entry ... no more PID entries.
* skip any entries with wildcards in the first segment of the
* directory name.
*/
while (index < priv->nentries + g_procfsentrycount)
{
name = g_procfsentries[index - priv->nentries].pathpattern;
while (*name != '/' && *name != '\0')
{
if (*name == '*' || *name == '[' || *name == '?')
{
/* Wildcard found. Skip this entry */
index++;
name = NULL;
break;
}
name++;
}
/* Test if we skipped this entry */
if (name != NULL)
{
/* This entry is okay to report. Test if it has a duplicate
* first level name as the one we just reported. This could
* happen in the event of procfs_entry_s such as:
*
* fs/smartfs
* fs/nfs
* fs/nxffs
*/
name = g_procfsentries[index - priv->nentries].pathpattern;
if (!level0->lastlen || (strncmp(name, level0->lastread,
level0->lastlen) != 0))
{
/* Not a duplicate, return the first segment of this
* entry
*/
break;
}
else
{
/* Skip this entry ... duplicate 1st level name found */
index++;
}
}
}
/* Test if we are at the end of the directory */
if (index >= priv->nentries + g_procfsentrycount)
{
/* We signal the end of the directory by returning the special
* error -ENOENT
*/
fvdbg("Entry %d: End of directory\n", index);
ret = -ENOENT;
}
else
{
/* Report the next static entry */
level0->lastlen = strcspn(name, "/");
level0->lastread = name;
strncpy(dir->fd_dir.d_name, name, level0->lastlen);
dir->fd_dir.d_name[level0->lastlen] = '\0';
if (name[level0->lastlen] == '/')
{
dir->fd_dir.d_type = DTYPE_DIRECTORY;
}
else
{
dir->fd_dir.d_type = DTYPE_FILE;
}
/* Advance to next entry for the next read */
priv->index = index;
ret = OK;
}
}
#ifndef CONFIG_FS_PROCFS_EXCLUDE_PROCESS
else
{
/* Verify that the pid still refers to an active task/thread */
pid = level0->pid[index];
flags = irqsave();
tcb = sched_gettcb(pid);
irqrestore(flags);
if (!tcb)
{
fdbg("ERROR: PID %d is no longer valid\n", (int)pid);
return -ENOENT;
}
/* Save the filename=pid and file type=directory */
dir->fd_dir.d_type = DTYPE_DIRECTORY;
snprintf(dir->fd_dir.d_name, NAME_MAX+1, "%d", (int)pid);
/* Set up the next directory entry offset. NOTE that we could use the
* standard f_pos instead of our own private index.
*/
level0->base.index = index + 1;
ret = OK;
}
#endif /* CONFIG_FS_PROCFS_EXCLUDE_PROCESS */
}
/* Are we reading an intermediate subdirectory? */
else if (priv->level > 0 && priv->procfsentry == NULL)
{
FAR struct procfs_level1_s *level1;
level1 = (FAR struct procfs_level1_s *) priv;
/* Test if this entry matches. We assume all entries of the same
* subdirectory are listed in order in the procfs_entry array.
*/
if (strncmp(g_procfsentries[level1->base.index].pathpattern,
g_procfsentries[level1->firstindex].pathpattern,
level1->subdirlen) == 0)
{
/* This entry matches. Report the subdir entry */
name = &g_procfsentries[level1->base.index].pathpattern[
level1->subdirlen + 1];
level1->lastlen = strcspn(name, "/");
level1->lastread = name;
strncpy(dir->fd_dir.d_name, name, level1->lastlen);
/* Some of the search entries contain '**' wildcards. When we
* report the entry name, we must remove this wildcard search
* specifier.
*/
while (dir->fd_dir.d_name[level1->lastlen - 1] == '*')
{
level1->lastlen--;
}
dir->fd_dir.d_name[level1->lastlen] = '\0';
if (name[level1->lastlen] == '/')
{
dir->fd_dir.d_type = DTYPE_DIRECTORY;
}
else
{
dir->fd_dir.d_type = DTYPE_FILE;
}
level1->base.index++;
ret = OK;
}
else
{
/* No more entries in the subdirectory */
ret = -ENOENT;
}
}
else
{
/* We are performing a directory search of one of the subdirectories
* and we must let the handler perform the read.
*/
DEBUGASSERT(priv->procfsentry && priv->procfsentry->ops->readdir);
ret = priv->procfsentry->ops->readdir(dir);
}
return ret;
}
static int procfs_opendir(FAR struct inode *mountpt, FAR const char *relpath,
FAR struct fs_dirent_s *dir)
{
FAR struct procfs_level0_s *level0;
FAR struct procfs_dir_priv_s *dirpriv;
FAR void *priv = NULL;
irqstate_t flags;
fvdbg("relpath: \"%s\"\n", relpath ? relpath : "NULL");
DEBUGASSERT(mountpt && relpath && dir && !dir->u.procfs);
/* The relative must be either:
*
* "" - The top level directory of task/thread IDs
* "<pid>" - The sub-directory of task/thread attributes
*/
if (!relpath || relpath[0] == '\0')
{
/* The path refers to the top level directory. Allocate the level0
* dirent structure.
*/
level0 = (FAR struct procfs_level0_s *)
kmm_zalloc(sizeof(struct procfs_level0_s));
if (!level0)
{
fdbg("ERROR: Failed to allocate the level0 directory structure\n");
return -ENOMEM;
}
/* Take a snapshot of all currently active tasks. Any new tasks
* added between the opendir() and closedir() call will not be
* visible.
*
* NOTE that interrupts must be disabled throughout the traversal.
*/
#ifndef CONFIG_FS_PROCFS_EXCLUDE_PROCESS
flags = irqsave();
sched_foreach(procfs_enum, level0);
irqrestore(flags);
#else
level0->base.index = 0;
level0->base.nentries = 0;
#endif
/* Initialze lastread entries */
level0->lastread = "";
level0->lastlen = 0;
level0->base.procfsentry = NULL;
priv = (FAR void *)level0;
}
else
{
int x, ret;
int len = strlen(relpath);
/* Search the static array of procfs_entries */
for (x = 0; x < g_procfsentrycount; x++)
{
/* Test if the path matches this entry's specification */
if (match(g_procfsentries[x].pathpattern, relpath))
{
/* Match found! Call the handler's opendir routine. If successful,
* this opendir routine will create an entry derived from struct
* procfs_dir_priv_s as dir->u.procfs.
*/
DEBUGASSERT(g_procfsentries[x].ops && g_procfsentries[x].ops->opendir);
ret = g_procfsentries[x].ops->opendir(relpath, dir);
if (ret == OK)
{
DEBUGASSERT(dir->u.procfs);
/* Set the procfs_entry handler */
dirpriv = (FAR struct procfs_dir_priv_s *)dir->u.procfs;
dirpriv->procfsentry = &g_procfsentries[x];
}
return ret;
}
/* Test for a sub-string match (e.g. "ls /proc/fs") */
else if (strncmp(g_procfsentries[x].pathpattern, relpath, len) == 0)
{
FAR struct procfs_level1_s *level1;
/* Doing an intermediate directory search */
/* The path refers to the top level directory. Allocate the level0
* dirent structure.
*/
level1 = (FAR struct procfs_level1_s *)
kmm_zalloc(sizeof(struct procfs_level1_s));
if (!level1)
{
fdbg("ERROR: Failed to allocate the level0 directory structure\n");
return -ENOMEM;
}
level1->base.level = 1;
level1->base.index = x;
level1->firstindex = x;
level1->subdirlen = len;
level1->lastread = "";
level1->lastlen = 0;
level1->base.procfsentry = NULL;
priv = (FAR void *)level1;
break;
}
}
}
dir->u.procfs = priv;
return OK;
}
int rwb_write(FAR struct rwbuffer_s *rwb, off_t startblock,
size_t nblocks, FAR const uint8_t *wrbuffer)
{
int ret;
#ifdef CONFIG_DRVR_READAHEAD
if (rhmaxblocks > 0)
{
/* If the new write data overlaps any part of the read buffer, then
* flush the data from the read buffer. We could attempt some more
* exotic handling -- but this simple logic is well-suited for simple
* streaming applications.
*/
rwb_semtake(&rwb->rhsem);
if (rwb_overlap(rwb->rhblockstart, rwb->rhnblocks, startblock, nblocks))
{
rwb_resetrhbuffer(rwb);
}
rwb_semgive(&rwb->rhsem);
}
#endif
#ifdef CONFIG_DRVR_WRITEBUFFER
if (rwb->wrmaxblocks > 0)
{
fvdbg("startblock=%d wrbuffer=%p\n", startblock, wrbuffer);
/* Use the block cache unless the buffer size is bigger than block cache */
if (nblocks > rwb->wrmaxblocks)
{
/* First flush the cache */
rwb_semtake(&rwb->wrsem);
rwb_wrflush(rwb);
rwb_semgive(&rwb->wrsem);
/* Then transfer the data directly to the media */
ret = rwb->wrflush(rwb->dev, startblock, nblocks, wrbuffer);
}
else
{
/* Buffer the data in the write buffer */
ret = rwb_writebuffer(rwb, startblock, nblocks, wrbuffer);
}
/* On success, return the number of blocks that we were requested to
* write. This is for compatibility with the normal return of a block
* driver write method
*/
}
else
#else
{
/* No write buffer.. just pass the write operation through via the
* flush callback.
*/
ret = rwb->wrflush(rwb->dev, startblock, nblocks, wrbuffer);
}
#endif
return ret;
}
int nxffs_stat(FAR struct inode *mountpt, FAR const char *relpath,
FAR struct stat *buf)
{
FAR struct nxffs_volume_s *volume;
struct nxffs_entry_s entry;
int ret;
fvdbg("Entry\n");
/* Sanity checks */
DEBUGASSERT(mountpt && mountpt->i_private && buf);
/* Get the mountpoint private data from the NuttX inode structure */
volume = mountpt->i_private;
ret = sem_wait(&volume->exclsem);
if (ret != OK)
{
goto errout;
}
/* Initialize the return stat instance */
memset(buf, 0, sizeof(struct stat));
buf->st_blksize = volume->geo.blocksize;
buf->st_blocks = entry.datlen / (volume->geo.blocksize - SIZEOF_NXFFS_BLOCK_HDR);
/* The requested directory must be the volume-relative "root" directory */
if (relpath && relpath[0] != '\0')
{
/* Not the top directory.. find the NXFFS inode with this name */
ret = nxffs_findinode(volume, relpath, &entry);
if (ret < 0)
{
fdbg("ERROR: Inode '%s' not found: %d\n", -ret);
goto errout_with_semaphore;
}
buf->st_mode = S_IFREG|S_IXOTH|S_IXGRP|S_IXUSR;
buf->st_size = entry.datlen;
buf->st_atime = entry.utc;
buf->st_mtime = entry.utc;
buf->st_ctime = entry.utc;
/* Free inode resources */
nxffs_freeentry(&entry);
}
else
{
/* It's a read/execute-only directory name */
buf->st_mode = S_IFDIR|S_IROTH|S_IRGRP|S_IRUSR|S_IXOTH|S_IXGRP|S_IXUSR;
}
ret = OK;
errout_with_semaphore:
sem_post(&volume->exclsem);
errout:
return ret;
}
int rwb_initialize(FAR struct rwbuffer_s *rwb)
{
uint32_t allocsize;
/* Sanity checking */
DEBUGASSERT(rwb != NULL);
DEBUGASSERT(rwb->blocksize > 0);
DEBUGASSERT(rwb->nblocks > 0);
DEBUGASSERT(rwb->dev != NULL);
/* Setup so that rwb_uninitialize can handle a failure */
#ifdef CONFIG_DRVR_WRITEBUFFER
DEBUGASSERT(rwb->wrflush!= NULL);
rwb->wrbuffer = NULL;
#endif
#ifdef CONFIG_DRVR_READAHEAD
DEBUGASSERT(rwb->rhreload != NULL);
rwb->rhbuffer = NULL;
#endif
#ifdef CONFIG_DRVR_WRITEBUFFER
if (rwb->wrmaxblocks > 0)
{
fvdbg("Initialize the write buffer\n");
/* Initialize the write buffer access semaphore */
sem_init(&rwb->wrsem, 0, 1);
/* Initialize write buffer parameters */
rwb_resetwrbuffer(rwb);
/* Allocate the write buffer */
rwb->wrbuffer = NULL;
if (rwb->wrmaxblocks > 0)
{
allocsize = rwb->wrmaxblocks * rwb->blocksize;
rwb->wrbuffer = kmm_malloc(allocsize);
if (!rwb->wrbuffer)
{
fdbg("Write buffer kmm_malloc(%d) failed\n", allocsize);
return -ENOMEM;
}
}
fvdbg("Write buffer size: %d bytes\n", allocsize);
}
#endif /* CONFIG_DRVR_WRITEBUFFER */
#ifdef CONFIG_DRVR_READAHEAD
if (rhmaxblocks > 0)
{
fvdbg("Initialize the read-ahead buffer\n");
/* Initialize the read-ahead buffer access semaphore */
sem_init(&rwb->rhsem, 0, 1);
/* Initialize read-ahead buffer parameters */
rwb_resetrhbuffer(rwb);
/* Allocate the read-ahead buffer */
rwb->rhbuffer = NULL;
if (rwb->rhmaxblocks > 0)
{
allocsize = rwb->rhmaxblocks * rwb->blocksize;
rwb->rhbuffer = kmm_malloc(allocsize);
if (!rwb->rhbuffer)
{
fdbg("Read-ahead buffer kmm_malloc(%d) failed\n", allocsize);
return -ENOMEM;
}
}
fvdbg("Read-ahead buffer size: %d bytes\n", allocsize);
}
#endif /* CONFIG_DRVR_READAHEAD */
return OK;
}
int rwb_read(FAR struct rwbuffer_s *rwb, off_t startblock, uint32_t nblocks,
FAR uint8_t *rdbuffer)
{
uint32_t remaining;
fvdbg("startblock=%ld nblocks=%ld rdbuffer=%p\n",
(long)startblock, (long)nblocks, rdbuffer);
#ifdef CONFIG_DRVR_WRITEBUFFER
/* If the new read data overlaps any part of the write buffer, then
* flush the write data onto the physical media before reading. We
* could attempt some more exotic handling -- but this simple logic
* is well-suited for simple streaming applications.
*/
if (rwb->wrmaxblocks > 0)
{
/* If the write buffer overlaps the block(s) requested, then flush the
* write buffer.
*/
rwb_semtake(&rwb->wrsem);
if (rwb_overlap(rwb->wrblockstart, rwb->wrnblocks, startblock, nblocks))
{
rwb_wrflush(rwb);
}
rwb_semgive(&rwb->wrsem);
}
#endif
#ifdef CONFIG_DRVR_READAHEAD
if (rhmaxblocks > 0)
{
/* Loop until we have read all of the requested blocks */
rwb_semtake(&rwb->rhsem);
for (remaining = nblocks; remaining > 0;)
{
/* Is there anything in the read-ahead buffer? */
if (rwb->rhnblocks > 0)
{
off_t startblock = startblock;
size_t nbufblocks = 0;
off_t bufferend;
/* Loop for each block we find in the read-head buffer. Count
* the number of buffers that we can read from read-ahead
* buffer.
*/
bufferend = rwb->rhblockstart + rwb->rhnblocks;
while ((startblock >= rwb->rhblockstart) &&
(startblock < bufferend) &&
(remaining > 0))
{
/* This is one more that we will read from the read ahead
* buffer.
*/
nbufblocks++;
/* And one less that we will read from the media */
startblock++;
remaining--;
}
/* Then read the data from the read-ahead buffer */
rwb_bufferread(rwb, startblock, nbufblocks, &rdbuffer);
}
/* If we did not get all of the data from the buffer, then we have
* to refill the buffer and try again.
*/
if (remaining > 0)
{
int ret = rwb_rhreload(rwb, startblock);
if (ret < 0)
{
fdbg("ERROR: Failed to fill the read-ahead buffer: %d\n", ret);
return ret;
}
}
}
/* On success, return the number of blocks that we were requested to
* read. This is for compatibility with the normal return of a block
* driver read method
*/
rwb_semgive(&rwb->rhsem);
ret = nblocks;
}
else
#else
{
/* No read-ahead buffering, (re)load the data directly into
* the user buffer.
*/
ret = rwb->rhreload(rwb->dev, startblock, nblocks, rdbuffer);
}
#endif
return ret;
}
int nxffs_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct nxffs_volume_s *volume;
int ret;
fvdbg("cmd: %d arg: %08lx\n", cmd, arg);
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover the file system state from the open file */
volume = filep->f_inode->i_private;
DEBUGASSERT(volume != NULL);
/* Get exclusive access to the volume. Note that the volume exclsem
* protects the open file list.
*/
ret = sem_wait(&volume->exclsem);
if (ret != OK)
{
ret = -errno;
fdbg("sem_wait failed: %d\n", ret);
goto errout;
}
/* Only a reformat and optimize commands are supported */
if (cmd == FIOC_REFORMAT)
{
fvdbg("Reformat command\n");
/* We cannot reformat the volume if there are any open inodes */
if (volume->ofiles)
{
fdbg("Open files\n");
ret = -EBUSY;
goto errout_with_semaphore;
}
/* Re-format the volume -- all is lost */
ret = nxffs_reformat(volume);
}
else if (cmd == FIOC_OPTIMIZE)
{
fvdbg("Optimize command\n");
/* Pack the volume */
ret = nxffs_pack(volume);
}
else
{
/* No other commands supported */
ret = -ENOTTY;
}
errout_with_semaphore:
sem_post(&volume->exclsem);
errout:
return ret;
}
int rwb_invalidate_writebuffer(FAR struct rwbuffer_s *rwb,
off_t startblock, size_t blockcount)
{
int ret;
if (rwb->wrmaxblocks > 0 && wrnblocks > 0)
{
off_t wrbend;
off_t invend;
fvdbg("startblock=%d blockcount=%p\n", startblock, blockcount);
rwb_semtake(&rwb->wrsem);
/* Now there are five cases:
*
* 1. We invalidate nothing
*/
wrbend = rwb->wrblockstart + rwb->wrnblocks;
invend = startblock + blockcount;
if (rwb->wrblockstart > invend || wrbend < startblock)
{
ret = OK;
}
/* 2. We invalidate the entire write buffer. */
else if (rwb->wrblockstart >= startblock && wrbend <= invend)
{
rwb->wrnblocks = 0;
ret = OK;
}
/* We are going to invalidate a subset of the write buffer. Three
* more cases to consider:
*
* 2. We invalidate a portion in the middle of the write buffer
*/
else if (rwb->wrblockstart < startblock && wrbend > invend)
{
uint8_t *src;
off_t block;
off_t offset;
size_t nblocks;
/* Write the blocks at the end of the media to hardware */
nblocks = wrbend - invend;
block = invend;
offset = block - rwb->wrblockstart;
src = rwb->wrbuffer + offset * rwb->blocksize;
ret = rwb->wrflush(rwb->dev, block, nblocks, src);
if (ret < 0)
{
fdbg("ERROR: wrflush failed: %d\n", ret);
}
/* Keep the blocks at the beginning of the buffer up the
* start of the invalidated region.
*/
else
{
rwb->wrnblocks = startblock - rwb->wrblockstart;
ret = OK;
}
}
/* 3. We invalidate a portion at the end of the write buffer */
else if (wrbend > startblock && wrbend <= invend)
{
rwb->wrnblocks = wrbend - startblock;
ret = OK;
}
/* 4. We invalidate a portion at the beginning of the write buffer */
else /* if (rwb->wrblockstart >= startblock && wrbend < invend) */
{
uint8_t *src;
size_t ninval;
size_t nkeep;
DEBUGASSERT(rwb->wrblockstart >= startblock && wrbend < invend);
/* Copy the data from the uninvalidated region to the beginning
* of the write buffer.
*
* First calculate the source and destination of the transfer.
*/
ninval = invend - rwb->wrblockstart;
src = rwb->wrbuffer + ninval * rwb->blocksize;
/* Calculate the number of blocks we are keeping. We keep
* the ones that we don't invalidate.
*/
nkeep = rwb->wrnblocks - ninval;
/* Then move the data that we are keeping to the beginning
* the write buffer.
*/
memcpy(rwb->wrbuffer, src, nkeep * rwb->blocksize);
/* Update the block info. The first block is now the one just
* after the invalidation region and the number buffered blocks
* is the number that we kept.
*/
rwb->wrblockstart = invend;
rwb->wrnblocks = nkeep;
ret = OK;
}
rwb_semgive(&rwb->wrsem);
}
return ret;
}
static int rd_close(FAR struct inode *inode)
{
fvdbg("Entry\n");
return OK;
}
int nxffs_close(FAR struct file *filep)
{
FAR struct nxffs_volume_s *volume;
FAR struct nxffs_ofile_s *ofile;
int ret;
fvdbg("Closing\n");
/* Sanity checks */
DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
/* Recover the open file state from the struct file instance */
ofile = (FAR struct nxffs_ofile_s *)filep->f_priv;
/* Recover the volume state from the open file */
volume = (FAR struct nxffs_volume_s *)filep->f_inode->i_private;
DEBUGASSERT(volume != NULL);
/* Get exclusive access to the volume. Note that the volume exclsem
* protects the open file list.
*/
ret = sem_wait(&volume->exclsem);
if (ret != OK)
{
ret = -get_errno();
fdbg("ERROR: sem_wait failed: %d\n", ret);
goto errout;
}
/* Decrement the reference count on the open file */
ret = OK;
if (ofile->crefs == 1)
{
/* Decrementing the reference count would take it zero.
*
* Remove the entry from the open file list. We do this early
* to avoid some chick-and-egg problems with file truncation.
*/
nxffs_remofile(volume, ofile);
/* Handle special finalization of the write operation. */
if ((ofile->oflags & O_WROK) != 0)
{
ret = nxffs_wrclose(volume, (FAR struct nxffs_wrfile_s *)ofile);
}
/* Release all resouces held by the open file */
nxffs_freeofile(volume, ofile);
}
else
{
/* Just decrement the reference count */
ofile->crefs--;
}
filep->f_priv = NULL;
sem_post(&volume->exclsem);
errout:
return ret;
}
FAR struct mtd_dev_s *mtd_rwb_initialize(FAR struct mtd_dev_s *mtd)
{
FAR struct mtd_rwbuffer_s *priv;
struct mtd_geometry_s geo;
int ret;
fvdbg("mtd: %p\n", mtd);
DEBUGASSERT(mtd && mtd->ioctl);
/* Get the device geometry */
ret = mtd->ioctl(mtd, MTDIOC_GEOMETRY, (unsigned long)((uintptr_t)&geo));
if (ret < 0)
{
fdbg("ERROR: MTDIOC_GEOMETRY ioctl failed: %d\n", ret);
return NULL;
}
/* Allocate a state structure (we allocate the structure instead of using
* a fixed, static allocation so that we can handle multiple FLASH devices.
* The current implementation would handle only one FLASH part per SPI
* device (only because of the SPIDEV_FLASH definition) and so would have
* to be extended to handle multiple FLASH parts on the same SPI bus.
*/
priv = (FAR struct mtd_rwbuffer_s *)kmm_zalloc(sizeof(struct mtd_rwbuffer_s));
if (priv)
{
/* Initialize the allocated structure. (unsupported methods/fields
* were already nullified by kmm_zalloc).
*/
priv->mtd.erase = mtd_erase; /* Our MTD erase method */
priv->mtd.bread = mtd_bread; /* Our MTD bread method */
priv->mtd.bwrite = mtd_bwrite; /* Our MTD bwrite method */
priv->mtd.read = mtd_read; /* Our MTD read method */
priv->mtd.ioctl = mtd_ioctl; /* Our MTD ioctl method */
priv->dev = mtd; /* The contained MTD instance */
/* Sectors per block. The erase block size must be an even multiple
* of the sector size.
*/
priv->spb = geo.erasesize / geo.blocksize;
DEBUGASSERT((size_t)priv->spb * geo_blocksize = geo.erasesize);
/* Values must be provided to rwb_initialize() */
/* Supported geometry */
priv->rwb.blocksize = geo.blocksize;
priv->rwb.nblocks = geo.neraseblocks * priv->spb;
/* Buffer setup */
#ifdef CONFIG_DRVR_WRITEBUFFER
priv->rwb.wrmaxblocks = CONFIG_MTD_NWRBLOCKS;
#endif
#ifdef CONFIG_DRVR_READAHEAD
priv->rwb.rhmaxblocks = CONFIG_MTD_NRDBLOCKS;
#endif
/* Callouts */
priv->rwb.dev = priv; /* Device state passed to callouts */
priv->rwb.wrflush = mtd_flush; /* Callout to flush buffer */
priv->rwb.rhreload = mtd_reload; /* Callout to reload buffer */
/* Initialize read-ahead/write buffering */
ret = rwb_initialize(&priv->rwb);
if (ret < 0)
{
fdbg("ERROR: rwb_initialize failed: %d\n", ret);
kmm_free(priv);
return NULL;
}
}
/* Register the MTD with the procfs system if enabled */
#ifdef CONFIG_MTD_REGISTRATION
mtd_register(&priv->mtd, "rwbuffer");
#endif
/* Return the implementation-specific state structure as the MTD device */
fvdbg("Return %p\n", priv);
return &priv->mtd;
}
static inline int nxffs_rdopen(FAR struct nxffs_volume_s *volume,
FAR const char *name,
FAR struct nxffs_ofile_s **ppofile)
{
FAR struct nxffs_ofile_s *ofile;
int ret;
/* Get exclusive access to the volume. Note that the volume exclsem
* protects the open file list.
*/
ret = sem_wait(&volume->exclsem);
if (ret != OK)
{
fdbg("ERROR: sem_wait failed: %d\n", ret);
ret = -get_errno();
goto errout;
}
/* Check if the file has already been opened (for reading) */
ofile = nxffs_findofile(volume, name);
if (ofile)
{
/* The file is already open.
* Limitation: Files cannot be open both for reading and writing.
*/
if ((ofile->oflags & O_WROK) != 0)
{
fdbg("ERROR: File is open for writing\n");
ret = -ENOSYS;
goto errout_with_exclsem;
}
/* Just increment the reference count on the ofile */
ofile->crefs++;
fvdbg("crefs: %d\n", ofile->crefs);
}
/* The file has not yet been opened.
* Limitation: The file must exist. We do not support creation of files
* read-only.
*/
else
{
/* Not already open.. create a new open structure */
ofile = (FAR struct nxffs_ofile_s *)kmm_zalloc(sizeof(struct nxffs_ofile_s));
if (!ofile)
{
fdbg("ERROR: ofile allocation failed\n");
ret = -ENOMEM;
goto errout_with_exclsem;
}
/* Initialize the open file state structure */
ofile->crefs = 1;
ofile->oflags = O_RDOK;
/* Find the file on this volume associated with this file name */
ret = nxffs_findinode(volume, name, &ofile->entry);
if (ret != OK)
{
fvdbg("Inode '%s' not found: %d\n", name, -ret);
goto errout_with_ofile;
}
/* Add the open file structure to the head of the list of open files */
ofile->flink = volume->ofiles;
volume->ofiles = ofile;
}
/* Return the open file state structure */
*ppofile = ofile;
sem_post(&volume->exclsem);
return OK;
errout_with_ofile:
kmm_free(ofile);
errout_with_exclsem:
sem_post(&volume->exclsem);
errout:
return ret;
}
static int mtd_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
{
FAR struct mtd_rwbuffer_s *priv = (FAR struct mtd_rwbuffer_s *)dev;
int ret = -EINVAL; /* Assume good command with bad parameters */
fvdbg("cmd: %d \n", cmd);
switch (cmd)
{
case MTDIOC_GEOMETRY:
{
FAR struct mtd_geometry_s *geo = (FAR struct mtd_geometry_s *)((uintptr_t)arg);
if (geo)
{
/* Populate the geometry structure with information need to know
* the capacity and how to access the device.
*
* NOTE: that the device is treated as though it where just an array
* of fixed size blocks. That is most likely not true, but the client
* will expect the device logic to do whatever is necessary to make it
* appear so.
*/
geo->blocksize = priv->rwb.blocksize;
geo->erasesize = priv->rwb.blocksize* priv->spb;
geo->neraseblocks = priv->rwb.nblocks * priv->spb;
ret = OK;
fvdbg("blocksize: %d erasesize: %d neraseblocks: %d\n",
geo->blocksize, geo->erasesize, geo->neraseblocks);
}
}
break;
case MTDIOC_BULKERASE:
{
/* Erase the entire device */
ret = priv->dev->ioctl(priv->dev, MTDIOC_BULKERASE, 0);
if (ret >= 0)
{
fdbg("ERROR: Device ioctl failed: %d\n", ret);
break;
}
/* Then invalidate in cached data */
ret = rwb_invalidate(&priv->rwb,0, priv->rwb.nblocks);
if (ret < 0)
{
fdbg("ERROR: rwb_invalidate failed: %d\n", ret);
}
}
break;
case MTDIOC_XIPBASE:
default:
ret = -ENOTTY; /* Bad command */
break;
}
fvdbg("return %d\n", ret);
return ret;
}
int rwb_invalidate_readahead(FAR struct rwbuffer_s *rwb,
off_t startblock, size_t blockcount)
{
int ret;
if (rwb->rhmaxblocks > 0 && rhnblocks > 0)
{
off_t rhbend;
off_t invend;
fvdbg("startblock=%d blockcount=%p\n", startblock, blockcount);
rwb_semtake(&rwb->rhsem);
/* Now there are five cases:
*
* 1. We invalidate nothing
*/
rhbend = rwb->rhblockstart + rwb->rhnblocks;
invend = startblock + blockcount;
if (rwb->rhblockstart > invend || rhbend < startblock)
{
ret = OK;
}
/* 2. We invalidate the entire read-ahead buffer. */
else if (rwb->rhblockstart >= startblock && rhbend <= invend)
{
rwb->rhnblocks = 0;
ret = OK;
}
/* We are going to invalidate a subset of the read-ahead buffer.
* Three more cases to consider:
*
* 2. We invalidate a portion in the middle of the write buffer
*/
else if (rwb->rhblockstart < startblock && rhbend > invend)
{
/* Keep the blocks at the beginning of the buffer up the
* start of the invalidated region.
*/
rwb->rhnblocks = startblock - rwb->rhblockstart;
ret = OK;
}
/* 3. We invalidate a portion at the end of the read-ahead buffer */
else if (rhbend > startblock && rhbend <= invend)
{
rwb->rhnblocks = rhbend - startblock;
ret = OK;
}
/* 4. We invalidate a portion at the beginning of the write buffer */
else /* if (rwb->rhblockstart >= startblock && rhbend < invend) */
{
/* Let's just force the whole read-ahead buffer to be reloaded.
* That might cost s small amount of performance, but well worth
* the lower complexity.
*/
DEBUGASSERT(rwb->rhblockstart >= startblock && rhbend < invend);
rwb->rhnblocks = 0;
ret = OK;
}
rwb_semgive(&rwb->rhsem);
}
return ret;
}
static ssize_t uptime_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct uptime_file_s *attr;
size_t linesize;
off_t offset;
ssize_t ret;
#ifdef CONFIG_SYSTEM_TIME64
uint64_t ticktime;
#if !defined(CONFIG_HAVE_DOUBLE) || !defined(CONFIG_LIBC_FLOATINGPOINT)
uint64_t sec;
#endif
#else
uint32_t ticktime;
#if !defined(CONFIG_HAVE_DOUBLE) || !defined(CONFIG_LIBC_FLOATINGPOINT)
uint32_t sec;
#endif
#endif
#if defined(CONFIG_HAVE_DOUBLE) && defined(CONFIG_LIBC_FLOATINGPOINT)
double now;
#else
unsigned int remainder;
unsigned int csec;
#endif
fvdbg("buffer=%p buflen=%d\n", buffer, (int)buflen);
/* Recover our private data from the struct file instance */
attr = (FAR struct uptime_file_s *)filep->f_priv;
DEBUGASSERT(attr);
/* If f_pos is zero, then sample the system time. Otherwise, use
* the cached system time from the previous read(). It is necessary
* save the cached value in case, for example, the user is reading
* the time one byte at a time. In that case, the time must remain
* stable throughout the reads.
*/
if (filep->f_pos == 0)
{
#ifdef CONFIG_SYSTEM_TIME64
/* 64-bit timer */
ticktime = clock_systimer64();
#else
/* 32-bit timer */
ticktime = clock_systimer();
#endif
#if defined(CONFIG_HAVE_DOUBLE) && defined(CONFIG_LIBC_FLOATINGPOINT)
/* Convert the system up time to a seconds + hundredths of seconds string */
now = (double)ticktime / (double)CLOCKS_PER_SEC;
linesize = snprintf(attr->line, UPTIME_LINELEN, "%10.2f\n", now);
#else
/* Convert the system up time to seconds + hundredths of seconds */
sec = ticktime / CLOCKS_PER_SEC;
remainder = (unsigned int)(ticktime % CLOCKS_PER_SEC);
csec = (100 * remainder + (CLOCKS_PER_SEC / 2)) / CLOCKS_PER_SEC;
/* Make sure that rounding did not force the hundredths of a second above 99 */
if (csec > 99)
{
sec++;
csec -= 100;
}
/* Convert the seconds + hundredths of seconds to a string */
linesize = snprintf(attr->line, UPTIME_LINELEN, "%7lu.%02u\n", sec, csec);
#endif
/* Save the linesize in case we are re-entered with f_pos > 0 */
attr->linesize = linesize;
}
/* Transfer the system up time to user receive buffer */
offset = filep->f_pos;
ret = procfs_memcpy(attr->line, attr->linesize, buffer, buflen, &offset);
/* Update the file offset */
if (ret > 0)
{
filep->f_pos += ret;
}
return ret;
}