/** * This routine processes the read() system call. * * @param iop * @param buffer * @param count * @return int */ static ssize_t rtems_rfs_rtems_file_read (rtems_libio_t* iop, void* buffer, size_t count) { rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); rtems_rfs_pos pos; uint8_t* data = buffer; ssize_t read = 0; int rc; if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_READ)) printf("rtems-rfs: file-read: handle:%p count:%zd\n", file, count); rtems_rfs_rtems_lock (rtems_rfs_file_fs (file)); pos = iop->offset; if (pos < rtems_rfs_file_size (file)) { while (count) { size_t size; rc = rtems_rfs_file_io_start (file, &size, true); if (rc > 0) { read = rtems_rfs_rtems_error ("file-read: read: io-start", rc); break; } if (size == 0) break; if (size > count) size = count; memcpy (data, rtems_rfs_file_data (file), size); data += size; count -= size; read += size; rc = rtems_rfs_file_io_end (file, size, true); if (rc > 0) { read = rtems_rfs_rtems_error ("file-read: read: io-end", rc); break; } } } rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); return read; }
/** * This handler maps an open() operation onto rtems_io_open(). * * @param iop * @param pathname * @param flag * @param mode * @return int */ static int rtems_rfs_rtems_device_open ( rtems_libio_t *iop, const char *pathname, int oflag, mode_t mode) { rtems_rfs_file_system* fs = rtems_rfs_rtems_pathloc_dev (&iop->pathinfo); rtems_rfs_ino ino = rtems_rfs_rtems_get_iop_ino (iop); rtems_rfs_inode_handle inode; rtems_device_major_number major; rtems_device_minor_number minor; int rc; rtems_rfs_rtems_lock (fs); rc = rtems_rfs_inode_open (fs, ino, &inode, true); if (rc > 0) { rtems_rfs_rtems_unlock (fs); return rtems_rfs_rtems_error ("device_open: opening inode", rc); } major = rtems_rfs_inode_get_block (&inode, 0); minor = rtems_rfs_inode_get_block (&inode, 1); rc = rtems_rfs_inode_close (fs, &inode); if (rc > 0) { rtems_rfs_rtems_unlock (fs); return rtems_rfs_rtems_error ("device_open: closing inode", rc); } rtems_rfs_rtems_unlock (fs); iop->data0 = major; iop->data1 = (void *) (uintptr_t) minor; return rtems_deviceio_open (iop, pathname, oflag, mode, minor, major); }
static int rtems_rfs_rtems_file_open (rtems_libio_t* iop, const char* pathname, int oflag, mode_t mode) { rtems_rfs_file_system* fs = rtems_rfs_rtems_pathloc_dev (&iop->pathinfo); rtems_rfs_ino ino; rtems_rfs_file_handle* file; int flags; int rc; flags = 0; if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_OPEN)) printf("rtems-rfs: file-open: path:%s ino:%" PRId32 " flags:%04i mode:%04" PRIu32 "\n", pathname, ino, flags, mode); rtems_rfs_rtems_lock (fs); ino = rtems_rfs_rtems_get_iop_ino (iop); rc = rtems_rfs_file_open (fs, ino, flags, &file); if (rc > 0) { rtems_rfs_rtems_unlock (fs); return rtems_rfs_rtems_error ("file-open: open", rc); } if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_OPEN)) printf("rtems-rfs: file-open: handle:%p\n", file); iop->size = rtems_rfs_file_size (file); rtems_rfs_rtems_set_iop_file_handle (iop, file); rtems_rfs_rtems_unlock (fs); return 0; }
/** * This routine processes the close() system call. Note that there is nothing * to flush at this point. * * @param iop * @return int */ static int rtems_rfs_rtems_file_close (rtems_libio_t* iop) { rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); rtems_rfs_file_system* fs = rtems_rfs_file_fs (file); int rc; if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_CLOSE)) printf("rtems-rfs: file-close: handle:%p\n", file); rtems_rfs_rtems_lock (fs); rc = rtems_rfs_file_close (fs, file); if (rc > 0) rc = rtems_rfs_rtems_error ("file-close: file close", rc); rtems_rfs_rtems_unlock (fs); return rc; }
/** * This routine processes the ftruncate() system call. * * @param iop * @param length * @return int */ static int rtems_rfs_rtems_file_ftruncate (rtems_libio_t* iop, off_t length) { rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); int rc; if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_FTRUNC)) printf("rtems-rfs: file-ftrunc: handle:%p length:%" PRIdoff_t "\n", file, length); rtems_rfs_rtems_lock (rtems_rfs_file_fs (file)); rc = rtems_rfs_file_set_size (file, length); if (rc) rc = rtems_rfs_rtems_error ("file_ftruncate: set size", rc); rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); return rc; }
/** * This routine processes the write() system call. * * @param iop * @param buffer * @param count * @return ssize_t */ static ssize_t rtems_rfs_rtems_file_write (rtems_libio_t* iop, const void* buffer, size_t count) { rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); rtems_rfs_pos pos; rtems_rfs_pos file_size; const uint8_t* data = buffer; ssize_t write = 0; int rc; if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_WRITE)) printf("rtems-rfs: file-write: handle:%p count:%zd\n", file, count); rtems_rfs_rtems_lock (rtems_rfs_file_fs (file)); pos = iop->offset; file_size = rtems_rfs_file_size (file); if (pos > file_size) { /* * If the iop position is past the physical end of the file we need to set * the file size to the new length before writing. The * rtems_rfs_file_io_end() will grow the file subsequently. */ rc = rtems_rfs_file_set_size (file, pos); if (rc) { rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); return rtems_rfs_rtems_error ("file-write: write extend", rc); } rtems_rfs_file_set_bpos (file, pos); } else if (pos < file_size && rtems_libio_iop_is_append(iop)) { pos = file_size; rc = rtems_rfs_file_seek (file, pos, &pos); if (rc) { rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); return rtems_rfs_rtems_error ("file-write: write append seek", rc); } } while (count) { size_t size = count; rc = rtems_rfs_file_io_start (file, &size, false); if (rc) { /* * If we have run out of space and have written some data return that * amount first as the inode will have accounted for it. This means * there was no error and the return code from can be ignored. */ if (!write) write = rtems_rfs_rtems_error ("file-write: write open", rc); break; } if (size > count) size = count; memcpy (rtems_rfs_file_data (file), data, size); data += size; count -= size; write += size; rc = rtems_rfs_file_io_end (file, size, false); if (rc) { write = rtems_rfs_rtems_error ("file-write: write close", rc); break; } } if (write >= 0) iop->offset = pos + write; rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); return write; }
int rtems_rfs_rtems_initialise (rtems_filesystem_mount_table_entry_t* mt_entry, const void* data) { rtems_rfs_rtems_private* rtems; rtems_rfs_file_system* fs; uint32_t flags = 0; uint32_t max_held_buffers = RTEMS_RFS_FS_MAX_HELD_BUFFERS; const char* options = data; int rc; /* * Parse the options the user specifiies. */ while (options) { printf ("options=%s\n", options); if (strncmp (options, "hold-bitmaps", sizeof ("hold-bitmaps") - 1) == 0) flags |= RTEMS_RFS_FS_BITMAPS_HOLD; else if (strncmp (options, "no-local-cache", sizeof ("no-local-cache") - 1) == 0) flags |= RTEMS_RFS_FS_NO_LOCAL_CACHE; else if (strncmp (options, "max-held-bufs", sizeof ("max-held-bufs") - 1) == 0) { max_held_buffers = strtoul (options + sizeof ("max-held-bufs"), 0, 0); } else return rtems_rfs_rtems_error ("initialise: invalid option", EINVAL); options = strchr (options, ','); if (options) { ++options; if (*options == '\0') options = NULL; } } rtems = malloc (sizeof (rtems_rfs_rtems_private)); if (!rtems) return rtems_rfs_rtems_error ("initialise: local data", ENOMEM); memset (rtems, 0, sizeof (rtems_rfs_rtems_private)); rc = rtems_rfs_mutex_create (&rtems->access); if (rc > 0) { free (rtems); return rtems_rfs_rtems_error ("initialise: cannot create mutex", rc); } rc = rtems_rfs_mutex_lock (&rtems->access); if (rc > 0) { rtems_rfs_mutex_destroy (&rtems->access); free (rtems); return rtems_rfs_rtems_error ("initialise: cannot lock access mutex", rc); } rc = rtems_rfs_fs_open (mt_entry->dev, rtems, flags, max_held_buffers, &fs); if (rc) { free (rtems); return rtems_rfs_rtems_error ("initialise: open", rc); } mt_entry->fs_info = fs; mt_entry->ops = &rtems_rfs_ops; mt_entry->mt_fs_root->location.node_access = (void*) RTEMS_RFS_ROOT_INO; mt_entry->mt_fs_root->location.handlers = &rtems_rfs_rtems_dir_handlers; rtems_rfs_rtems_unlock (fs); return 0; }
/** * This routine processes the write() system call. * * @param iop * @param buffer * @param count * @return ssize_t */ static ssize_t rtems_rfs_rtems_file_write (rtems_libio_t* iop, const void* buffer, size_t count) { rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); rtems_rfs_pos pos; const uint8_t* data = buffer; ssize_t write = 0; int rc; if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_WRITE)) printf("rtems-rfs: file-write: handle:%p count:%zd\n", file, count); rtems_rfs_rtems_lock (rtems_rfs_file_fs (file)); pos = iop->offset; /* * If the iop position is past the physical end of the file we need to set * the file size to the new length before writing. If the position equals the * size of file we are still past the end of the file as positions number * from 0. For a specific position we need a file that has a length of one * more. */ if (pos >= rtems_rfs_file_size (file)) { rc = rtems_rfs_file_set_size (file, pos + 1); if (rc) { rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); return rtems_rfs_rtems_error ("file-write: write extend", rc); } } rtems_rfs_file_set_bpos (file, pos); while (count) { size_t size = count; rc = rtems_rfs_file_io_start (file, &size, false); if (rc) { write = rtems_rfs_rtems_error ("file-write: write open", rc); break; } if (size > count) size = count; memcpy (rtems_rfs_file_data (file), data, size); data += size; count -= size; write += size; rc = rtems_rfs_file_io_end (file, size, false); if (rc) { write = rtems_rfs_rtems_error ("file-write: write close", rc); break; } } iop->size = rtems_rfs_file_size (file); rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); return write; }