static ssize_t IMFS_fifo_write(
rtems_libio_t *iop,
const void *buffer,
size_t count
)
{
IMFS_jnode_t *jnode = iop->pathinfo.node_access;
int err = pipe_write(JNODE2PIPE(jnode), buffer, count, iop);
if (err > 0) {
IMFS_mtime_ctime_update(jnode);
}
IMFS_FIFO_RETURN(err);
}
ssize_t IMFS_fifo_write(
epos_libio_t *iop,
const void *buffer,
size_t count
)
{
IMFS_jnode_t *jnode = iop->file_info;
int err = pipe_write(JNODE2PIPE(jnode), buffer, count, iop);
if (err > 0) {
IMFS_mtime_ctime_update(jnode);
}
IMFS_FIFO_RETURN(err);
}
/*
* IMFS_memfile_write
*
* This routine writes the specified data buffer into the in memory
* file pointed to by memfile. The file is extended as needed.
*/
ssize_t IMFS_memfile_write(
IMFS_memfile_t *memfile,
off_t start,
const unsigned char *source,
unsigned int length
)
{
block_p *block_ptr;
unsigned int block;
int status;
unsigned int my_length;
unsigned int to_copy = 0;
unsigned int last_byte;
unsigned int start_offset;
int copied;
const unsigned char *src;
src = source;
/*
* Perform internal consistency checks
*/
IMFS_assert( source );
IMFS_assert( memfile );
my_length = length;
/*
* If the last byte we are supposed to write is past the end of this
* in memory file, then extend the length.
*/
last_byte = start + my_length;
if ( last_byte > memfile->File.size ) {
bool zero_fill = start > memfile->File.size;
status = IMFS_memfile_extend( memfile, zero_fill, last_byte );
if ( status )
return status;
}
copied = 0;
/*
* Three phases to the write:
* + possibly the last part of one block
* + all of zero of more blocks
* + possibly the first part of one block
*/
/*
* Phase 1: possibly the last part of one block
*/
start_offset = start % IMFS_MEMFILE_BYTES_PER_BLOCK;
block = start / IMFS_MEMFILE_BYTES_PER_BLOCK;
if ( start_offset ) {
to_copy = IMFS_MEMFILE_BYTES_PER_BLOCK - start_offset;
if ( to_copy > my_length )
to_copy = my_length;
block_ptr = IMFS_memfile_get_block_pointer( memfile, block, 0 );
if ( !block_ptr )
return copied;
#if 0
fprintf(
stderr,
"write %d at %d in %d: %*s\n",
to_copy,
start_offset,
block,
to_copy,
src
);
#endif
memcpy( &(*block_ptr)[ start_offset ], src, to_copy );
src += to_copy;
block++;
my_length -= to_copy;
copied += to_copy;
}
/*
* Phase 2: all of zero of more blocks
*/
to_copy = IMFS_MEMFILE_BYTES_PER_BLOCK;
while ( my_length >= IMFS_MEMFILE_BYTES_PER_BLOCK ) {
block_ptr = IMFS_memfile_get_block_pointer( memfile, block, 0 );
if ( !block_ptr )
return copied;
#if 0
fprintf(stdout, "write %d in %d: %*s\n", to_copy, block, to_copy, src );
#endif
memcpy( &(*block_ptr)[ 0 ], src, to_copy );
src += to_copy;
block++;
my_length -= to_copy;
copied += to_copy;
}
/*
* Phase 3: possibly the first part of one block
*/
IMFS_assert( my_length < IMFS_MEMFILE_BYTES_PER_BLOCK );
to_copy = my_length;
if ( my_length ) {
block_ptr = IMFS_memfile_get_block_pointer( memfile, block, 0 );
if ( !block_ptr )
return copied;
#if 0
fprintf(stdout, "write %d in %d: %*s\n", to_copy, block, to_copy, src );
#endif
memcpy( &(*block_ptr)[ 0 ], src, my_length );
my_length = 0;
copied += to_copy;
}
IMFS_mtime_ctime_update( &memfile->File.Node );
return copied;
}
/*
* IMFS_memfile_extend
*
* This routine insures that the in-memory file is of the length
* specified. If necessary, it will allocate memory blocks to
* extend the file.
*/
static int IMFS_memfile_extend(
IMFS_memfile_t *memfile,
bool zero_fill,
off_t new_length
)
{
unsigned int block;
unsigned int new_blocks;
unsigned int old_blocks;
unsigned int offset;
/*
* Perform internal consistency checks
*/
IMFS_assert( memfile );
/*
* Verify new file size is supported
*/
if ( new_length >= IMFS_MEMFILE_MAXIMUM_SIZE )
rtems_set_errno_and_return_minus_one( EFBIG );
/*
* Verify new file size is actually larger than current size
*/
if ( new_length <= memfile->File.size )
return 0;
/*
* Calculate the number of range of blocks to allocate
*/
new_blocks = new_length / IMFS_MEMFILE_BYTES_PER_BLOCK;
old_blocks = memfile->File.size / IMFS_MEMFILE_BYTES_PER_BLOCK;
offset = memfile->File.size - old_blocks * IMFS_MEMFILE_BYTES_PER_BLOCK;
/*
* Now allocate each of those blocks.
*/
for ( block=old_blocks ; block<=new_blocks ; block++ ) {
if ( !IMFS_memfile_addblock( memfile, block ) ) {
if ( zero_fill ) {
size_t count = IMFS_MEMFILE_BYTES_PER_BLOCK - offset;
block_p *block_ptr =
IMFS_memfile_get_block_pointer( memfile, block, 0 );
memset( &(*block_ptr) [offset], 0, count);
offset = 0;
}
} else {
for ( ; block>=old_blocks ; block-- ) {
IMFS_memfile_remove_block( memfile, block );
}
rtems_set_errno_and_return_minus_one( ENOSPC );
}
}
/*
* Set the new length of the file.
*/
memfile->File.size = new_length;
IMFS_mtime_ctime_update( &memfile->File.Node );
return 0;
}
int IMFS_make_generic_node(
const char *path,
mode_t mode,
const IMFS_node_control *node_control,
void *context
)
{
int rv = 0;
mode &= ~rtems_filesystem_umask;
switch (mode & S_IFMT) {
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
case S_IFREG:
case S_IFSOCK:
break;
default:
errno = EINVAL;
rv = -1;
break;
}
if ( rv == 0 ) {
if ( node_control->imfs_type == IMFS_GENERIC ) {
rtems_filesystem_eval_path_context_t ctx;
int eval_flags = RTEMS_FS_FOLLOW_LINK
| RTEMS_FS_MAKE
| RTEMS_FS_EXCLUSIVE;
const rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
if ( IMFS_is_imfs_instance( currentloc ) ) {
IMFS_types_union info;
IMFS_jnode_t *new_node;
info.generic.context = context;
new_node = IMFS_create_node_with_control(
currentloc,
node_control,
rtems_filesystem_eval_path_get_token( &ctx ),
rtems_filesystem_eval_path_get_tokenlen( &ctx ),
mode,
&info
);
if ( new_node != NULL ) {
IMFS_jnode_t *parent = currentloc->node_access;
IMFS_mtime_ctime_update( parent );
} else {
rv = -1;
}
} else {
rtems_filesystem_eval_path_error( &ctx, ENOTSUP );
rv = -1;
}
rtems_filesystem_eval_path_cleanup( &ctx );
} else {
errno = EINVAL;
rv = -1;
}
}
return rv;
}
MEMFILE_STATIC ssize_t IMFS_memfile_write(
IMFS_jnode_t *the_jnode,
off_t start,
const unsigned char *source,
unsigned int length
)
{
block_p *block_ptr;
unsigned int block;
int status;
unsigned int my_length;
unsigned int to_copy = 0;
unsigned int last_byte;
unsigned int start_offset;
int copied;
const unsigned char *src;
src = source;
/*
* Perform internal consistency checks
*/
assert( the_jnode );
if ( !the_jnode )
rtems_set_errno_and_return_minus_one( EIO );
assert( the_jnode->type == IMFS_MEMORY_FILE );
if ( the_jnode->type != IMFS_MEMORY_FILE )
rtems_set_errno_and_return_minus_one( EIO );
/*
* Error check arguments
*/
assert( source );
if ( !source )
rtems_set_errno_and_return_minus_one( EINVAL );
/*
* If there is nothing to write, then quick exit.
*/
my_length = length;
if ( !my_length )
rtems_set_errno_and_return_minus_one( EINVAL );
/*
* If the last byte we are supposed to write is past the end of this
* in memory file, then extend the length.
*/
last_byte = start + length;
if ( last_byte > the_jnode->info.file.size ) {
status = IMFS_memfile_extend( the_jnode, last_byte );
if ( status )
rtems_set_errno_and_return_minus_one( ENOSPC );
}
copied = 0;
/*
* Three phases to the write:
* + possibly the last part of one block
* + all of zero of more blocks
* + possibly the first part of one block
*/
/*
* Phase 1: possibly the last part of one block
*/
start_offset = start % IMFS_MEMFILE_BYTES_PER_BLOCK;
block = start / IMFS_MEMFILE_BYTES_PER_BLOCK;
if ( start_offset ) {
to_copy = IMFS_MEMFILE_BYTES_PER_BLOCK - start_offset;
if ( to_copy > my_length )
to_copy = my_length;
block_ptr = IMFS_memfile_get_block_pointer( the_jnode, block, 0 );
assert( block_ptr );
if ( !block_ptr )
return copied;
#if 0
fprintf(stdout, "write %d at %d in %d: %*s\n", to_copy, start_offset, block, to_copy, src );
#endif
memcpy( &(*block_ptr)[ start_offset ], src, to_copy );
src += to_copy;
block++;
my_length -= to_copy;
copied += to_copy;
}
/*
* Phase 2: all of zero of more blocks
*/
to_copy = IMFS_MEMFILE_BYTES_PER_BLOCK;
while ( my_length >= IMFS_MEMFILE_BYTES_PER_BLOCK ) {
block_ptr = IMFS_memfile_get_block_pointer( the_jnode, block, 0 );
assert( block_ptr );
if ( !block_ptr )
return copied;
#if 0
fprintf(stdout, "write %d in %d: %*s\n", to_copy, block, to_copy, src );
#endif
memcpy( &(*block_ptr)[ 0 ], src, to_copy );
src += to_copy;
block++;
my_length -= to_copy;
copied += to_copy;
}
/*
* Phase 3: possibly the first part of one block
*/
assert( my_length < IMFS_MEMFILE_BYTES_PER_BLOCK );
to_copy = my_length;
if ( my_length ) {
block_ptr = IMFS_memfile_get_block_pointer( the_jnode, block, 0 );
assert( block_ptr );
if ( !block_ptr )
return copied;
#if 0
fprintf(stdout, "write %d in %d: %*s\n", to_copy, block, to_copy, src );
#endif
memcpy( &(*block_ptr)[ 0 ], src, my_length );
my_length = 0;
copied += to_copy;
}
IMFS_mtime_ctime_update( the_jnode );
return copied;
}
