4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2007 Develer S.r.l. (http://www.develer.com/)
33 * \brief BattFS: a filesystem for embedded platforms (implementation).
37 * \author Francesco Sacchi <batt@develer.com>
43 #include <cfg/debug.h>
44 #include <cfg/macros.h> /* MIN, MAX */
45 #include <cpu/byteorder.h> /* cpu_to_xx */
47 #define LOG_LEVEL LOG_LVL_INFO
48 #define LOG_FORMAT LOG_FMT_VERBOSE
51 #include <string.h> /* memset, memmove */
53 #if LOG_LEVEL >= LOG_LVL_INFO
54 static void dumpPageArray(struct BattFsSuper *disk)
56 kprintf("Page array dump, free_page_start %d:", disk->free_page_start);
57 for (pgcnt_t i = 0; i < disk->page_count; i++)
61 kprintf("%04d ", disk->page_array[i]);
68 * Convert from memory representation to disk structure.
69 * \note filesystem is in little-endian format.
71 INLINE void battfs_to_disk(struct BattFsPageHeader *hdr, uint8_t *buf)
73 STATIC_ASSERT(BATTFS_HEADER_LEN == 12);
77 buf[2] = hdr->fill >> 8;
80 buf[4] = hdr->pgoff >> 8;
83 * Sequence number is 40 bits long.
84 * No need to take care of wraparonds: the memory will die first!
87 buf[6] = hdr->seq >> 8;
88 buf[7] = hdr->seq >> 16;
89 buf[8] = hdr->seq >> 24;
90 buf[9] = hdr->seq >> 32;
93 * This field must be the last one!
94 * This is needed because if the page is only partially
95 * written, we can use this to detect it.
98 buf[11] = hdr->fcs >> 8;
102 * Convert from disk structure to memory representation.
103 * \note filesystem is in little-endian format.
105 INLINE void disk_to_battfs(uint8_t *buf, struct BattFsPageHeader *hdr)
107 STATIC_ASSERT(BATTFS_HEADER_LEN == 12);
109 hdr->fill = buf[2] << 8 | buf[1];
110 hdr->pgoff = buf[4] << 8 | buf[3];
111 hdr->seq = (seq_t)buf[9] << 32 | (seq_t)buf[8] << 24 | (seq_t)buf[7] << 16 | buf[6] << 8 | buf[5];
112 hdr->fcs = buf[11] << 8 | buf[10];
116 * Compute the fcs of the header.
118 static fcs_t computeFcs(struct BattFsPageHeader *hdr)
120 uint8_t buf[BATTFS_HEADER_LEN];
123 battfs_to_disk(hdr, buf);
125 /* fcs is at the end of whole header */
126 rotating_update(buf, BATTFS_HEADER_LEN - sizeof(fcs_t), &cks);
132 * If available, the cache will be used.
133 * \return the number of bytes read.
135 static size_t diskRead(struct BattFsSuper *disk, pgcnt_t page, pgaddr_t addr, void *buf, size_t size)
137 /* Try to read from cache */
138 if (page == disk->curr_page)
139 return disk->bufferRead(disk, addr, buf, size);
142 return disk->read(disk, page, addr, buf, size);
147 * Read header of \a page in \a hdr.
148 * \return true on success, false otherwise.
150 static bool readHdr(struct BattFsSuper *disk, pgcnt_t page, struct BattFsPageHeader *hdr)
152 uint8_t buf[BATTFS_HEADER_LEN];
154 * Read header from disk.
155 * Header is actually a footer, and so
156 * resides at page end.
158 if (diskRead(disk, page, disk->page_size - BATTFS_HEADER_LEN, buf, BATTFS_HEADER_LEN)
159 != BATTFS_HEADER_LEN)
161 LOG_ERR("page[%d]\n", page);
166 disk_to_battfs(buf, hdr);
172 * Set header on current \a disk page buffer.
173 * \return true on success, false otherwise.
175 static bool setBufferHdr(struct BattFsSuper *disk, struct BattFsPageHeader *hdr)
177 uint8_t buf[BATTFS_HEADER_LEN];
179 #warning FIXME:refactor computeFcs to save time and stack
180 hdr->fcs = computeFcs(hdr);
182 battfs_to_disk(hdr, buf);
185 * write header to buffer.
186 * Header is actually a footer, and so
187 * resides at page end.
189 if (disk->bufferWrite(disk, disk->page_size - BATTFS_HEADER_LEN, buf, BATTFS_HEADER_LEN)
190 != BATTFS_HEADER_LEN)
192 LOG_ERR("writing to buffer\n");
198 static bool getBufferHdr(struct BattFsSuper *disk, struct BattFsPageHeader *hdr)
200 uint8_t buf[BATTFS_HEADER_LEN];
202 if (disk->bufferRead(disk, disk->page_size - BATTFS_HEADER_LEN, buf, BATTFS_HEADER_LEN)
203 != BATTFS_HEADER_LEN)
205 LOG_ERR("reading from buffer\n");
209 disk_to_battfs(buf, hdr);
215 * Count the number of pages from
216 * inode 0 to \a inode in \a filelen_table.
218 static pgcnt_t countPages(pgoff_t *filelen_table, inode_t inode)
222 for (inode_t i = 0; i < inode; i++)
223 cnt += filelen_table[i];
229 * Move all pages in page allocation array from \a src to \a src + \a offset.
230 * The number of pages moved is page_count - MAX(dst, src).
232 static void movePages(struct BattFsSuper *disk, pgcnt_t src, int offset)
234 pgcnt_t dst = src + offset;
235 LOG_INFO("src %d, offset %d, size %ld\n", src, offset, (disk->page_count - MAX(dst, src)) * sizeof(pgcnt_t));
236 memmove(&disk->page_array[dst], &disk->page_array[src], (disk->page_count - MAX(dst, src)) * sizeof(pgcnt_t));
240 /* Fill empty space in array with sentinel */
241 for (pgcnt_t page = disk->page_count + offset; page < disk->page_count; page++)
242 disk->page_array[page] = PAGE_UNSET_SENTINEL;
247 * Count number of pages per file on \a disk.
248 * This information is registered in \a filelen_table.
249 * Array index represent file inode, while value contained
250 * is the number of pages used by that file.
252 * \return true if ok, false on disk read errors.
253 * \note The whole disk is scanned once.
255 static bool countDiskFilePages(struct BattFsSuper *disk, pgoff_t *filelen_table)
257 BattFsPageHeader hdr;
258 disk->free_page_start = 0;
260 /* Count the number of disk page per file */
261 for (pgcnt_t page = 0; page < disk->page_count; page++)
263 if (!readHdr(disk, page, &hdr))
266 /* Increase free space */
267 disk->free_bytes += disk->page_size - BATTFS_HEADER_LEN;
269 /* Check header FCS */
270 if (hdr.fcs == computeFcs(&hdr))
272 ASSERT(hdr.fill <= disk->page_size - BATTFS_HEADER_LEN);
274 /* Page is valid and is owned by a file */
275 filelen_table[hdr.inode]++;
277 /* Keep trace of free space */
278 disk->free_bytes -= hdr.fill;
279 disk->free_page_start++;
282 LOG_INFO("free_bytes:%d, free_page_start:%d\n", disk->free_bytes, disk->free_page_start);
288 * Fill page allocation array of \a disk
289 * using file lenghts in \a filelen_table.
291 * The page allocation array is an array containings all file infos.
292 * Is ordered by file, and within each file is ordered by page offset
294 * e.g. : at page array[0] you will find page address of the first page
295 * of the first file (if present).
296 * Free blocks are allocated after the last file.
298 * \return true if ok, false on disk read errors.
299 * \note The whole disk is scanned at max twice.
301 static bool fillPageArray(struct BattFsSuper *disk, pgoff_t *filelen_table)
303 BattFsPageHeader hdr;
304 pgcnt_t curr_free_page = disk->free_page_start;
305 /* Fill page allocation array */
306 for (pgcnt_t page = 0; page < disk->page_count; page++)
308 if (!readHdr(disk, page, &hdr))
311 /* Check header FCS */
312 if (hdr.fcs == computeFcs(&hdr))
314 /* Compute array position */
315 pgcnt_t array_pos = countPages(filelen_table, hdr.inode);
316 array_pos += hdr.pgoff;
319 /* Check if position is already used by another page of the same file */
320 if (disk->page_array[array_pos] == PAGE_UNSET_SENTINEL)
321 disk->page_array[array_pos] = page;
324 BattFsPageHeader hdr_prv;
326 if (!readHdr(disk, disk->page_array[array_pos], &hdr_prv))
329 /* Check header FCS */
330 ASSERT(hdr_prv.fcs == computeFcs(&hdr_prv));
332 /* Only the very same page with a different seq number can be here */
333 ASSERT(hdr.inode == hdr_prv.inode);
334 ASSERT(hdr.pgoff == hdr_prv.pgoff);
335 ASSERT(hdr.seq != hdr_prv.seq);
337 pgcnt_t new_page, old_page;
341 * Sequence number comparison: since
342 * seq is 40 bits wide, it wraps once
343 * every 1.1E12 times.
344 * The memory will not live enough to
345 * see a wraparound, so we can use a simple
348 if (hdr.seq > hdr_prv.seq)
350 /* Current header is newer than the previuos one */
351 old_page = disk->page_array[array_pos];
353 old_fill = hdr_prv.fill;
357 /* Previous header is newer than the current one */
359 new_page = disk->page_array[array_pos];
364 disk->page_array[array_pos] = new_page;
366 disk->free_bytes += old_fill;
367 /* Shift all array one position to the left, overwriting duplicate page */
368 array_pos -= hdr.pgoff;
369 array_pos += filelen_table[hdr.inode];
370 movePages(disk, array_pos, -1);
371 /* Move back all indexes */
372 filelen_table[hdr.inode]--;
373 disk->free_page_start--;
375 /* Set old page as free */
376 ASSERT(disk->page_array[curr_free_page] == PAGE_UNSET_SENTINEL);
377 disk->page_array[curr_free_page++] = old_page;
383 /* Invalid page, keep as free */
384 ASSERT(disk->page_array[curr_free_page] == PAGE_UNSET_SENTINEL);
385 LOG_INFO("Page %d invalid, keeping as free\n", page);
386 disk->page_array[curr_free_page++] = page;
394 * Flush the current \a disk buffer.
395 * \return true if ok, false on errors.
397 static bool flushBuffer(struct BattFsSuper *disk)
399 if (disk->cache_dirty)
401 LOG_INFO("Flushing to disk page %d\n", disk->curr_page);
403 if (!(disk->erase(disk, disk->curr_page)
404 && disk->save(disk, disk->curr_page)))
407 disk->cache_dirty = false;
413 * Load \a new_page from \a disk in disk page buffer.
414 * If a previuos page is still dirty in the buffer, will be
415 * flushed first. The new page header loaded will be put in \a new_hdr.
416 * \return true if ok, false on errors.
418 static bool loadPage(struct BattFsSuper *disk, pgcnt_t new_page, BattFsPageHeader *new_hdr)
420 if (disk->curr_page == new_page)
421 return getBufferHdr(disk, new_hdr);
423 LOG_INFO("Loading page %d\n", new_page);
425 if (!(flushBuffer(disk)
426 && disk->load(disk, new_page)
427 && getBufferHdr(disk, new_hdr)))
430 disk->curr_page = new_page;
437 * Initialize and mount disk described by
439 * \return false on errors, true otherwise.
441 bool battfs_init(struct BattFsSuper *disk)
443 pgoff_t filelen_table[BATTFS_MAX_FILES];
448 /* Init disk device */
449 if (!disk->open(disk))
451 LOG_ERR("open error\n");
455 /* Disk open must set all of these */
458 ASSERT(disk->bufferWrite);
459 ASSERT(disk->bufferRead);
463 ASSERT(disk->page_size);
464 ASSERT(disk->page_count);
465 ASSERT(disk->page_count < PAGE_UNSET_SENTINEL - 1);
466 ASSERT(disk->page_array);
468 memset(filelen_table, 0, BATTFS_MAX_FILES * sizeof(pgoff_t));
470 disk->free_bytes = 0;
471 disk->disk_size = (disk_size_t)(disk->page_size - BATTFS_HEADER_LEN) * disk->page_count;
473 /* Initialize page buffer cache */
474 disk->cache_dirty = false;
476 disk->load(disk, disk->curr_page);
478 /* Count pages per file */
479 if (!countDiskFilePages(disk, filelen_table))
481 LOG_ERR("counting file pages\n");
485 /* Once here, we have filelen_table filled with file lengths */
487 /* Fill page array with sentinel */
488 for (pgcnt_t page = 0; page < disk->page_count; page++)
489 disk->page_array[page] = PAGE_UNSET_SENTINEL;
491 /* Fill page allocation array using filelen_table */
492 if (!fillPageArray(disk, filelen_table))
494 LOG_ERR("filling page array\n");
497 #if LOG_LEVEL >= LOG_LVL_INFO
500 #warning TODO: shuffle free blocks
501 //#if LOG_LEVEL > LOG_LVL_INFO
502 // dumpPageArray(disk);
504 /* Init list for opened files. */
505 LIST_INIT(&disk->file_opened_list);
511 * \return 0 if ok, EOF on errors.
513 static int battfs_flush(struct KFile *fd)
515 BattFs *fdb = BATTFS_CAST(fd);
517 if (flushBuffer(fdb->disk))
525 * \return 0 if ok, EOF on errors.
527 static int battfs_fileclose(struct KFile *fd)
529 BattFs *fdb = BATTFS_CAST(fd);
537 static bool getNewPage(struct BattFsSuper *disk, pgcnt_t new_pos, inode_t inode, pgoff_t pgoff, BattFsPageHeader *new_hdr)
539 if (disk->free_page_start >= disk->page_count)
541 #warning TODO space over!
542 LOG_INFO("No disk space available\n");
546 LOG_INFO("Getting new page %d, pos %d\n", disk->page_array[disk->free_page_start], new_pos);
547 disk->curr_page = disk->page_array[disk->free_page_start++];
548 memmove(&disk->page_array[new_pos + 1], &disk->page_array[new_pos], (disk->free_page_start - new_pos - 1) * sizeof(pgcnt_t));
551 /* Move following file start point one position ahead. */
552 FOREACH_NODE(n, &disk->file_opened_list)
554 BattFs *file = containerof(n, BattFs, link);
555 if (file->inode > inode)
557 LOG_INFO("Move file %d start pos\n", file->inode);
562 disk->page_array[new_pos] = disk->curr_page;
563 disk->cache_dirty = true;
565 new_hdr->inode = inode;
566 new_hdr->pgoff = pgoff;
569 return setBufferHdr(disk, new_hdr);
573 * Write to file \a fd \a size bytes from \a buf.
574 * \return The number of bytes written.
576 static size_t battfs_write(struct KFile *fd, const void *_buf, size_t size)
578 BattFs *fdb = BATTFS_CAST(fd);
579 const uint8_t *buf = (const uint8_t *)_buf;
581 size_t total_write = 0;
583 pgaddr_t addr_offset;
585 BattFsPageHeader curr_hdr;
587 if (fd->seek_pos < 0)
590 if ((fd->seek_pos / (fdb->disk->page_size - BATTFS_HEADER_LEN)) > fdb->max_off)
593 * Handle writing when seek pos if far over EOF,
594 * We need to allocate the missing pages first.
596 pgoff_t missing_pages = fd->seek_pos / (fdb->disk->page_size - BATTFS_HEADER_LEN) - fdb->max_off;
598 LOG_INFO("missing pages: %d\n", missing_pages);
599 if (!loadPage(fdb->disk, fdb->start[fdb->max_off], &curr_hdr))
601 #warning TODO set error?
605 uint8_t dummy = 0xff;
606 /* Add missing pages to reach current seek_pos */
607 while (missing_pages--)
609 /* Update size and free space left */
610 fd->size += (fdb->disk->page_size - BATTFS_HEADER_LEN) - curr_hdr.fill;
611 fdb->disk->free_bytes -= (fdb->disk->page_size - BATTFS_HEADER_LEN) - curr_hdr.fill;
613 /* Fill empty space with 0xFF */
614 for (addr_offset = curr_hdr.fill; addr_offset < (fdb->disk->page_size - BATTFS_HEADER_LEN); addr_offset++)
616 if (fdb->disk->bufferWrite(fdb->disk, addr_offset, &dummy, 1) != 1)
618 #warning TODO set error?
621 curr_hdr.fill = (fdb->disk->page_size - BATTFS_HEADER_LEN);
622 setBufferHdr(fdb->disk, &curr_hdr);
624 /* Get the new page needed */
625 if (!getNewPage(fdb->disk, (fdb->start - fdb->disk->page_array) + fdb->max_off + 1, fdb->inode, fdb->max_off + 1, &curr_hdr))
630 /* Fix sizes for the last new page (could be only partially full) */
631 curr_hdr.fill = fd->seek_pos % (fdb->disk->page_size - BATTFS_HEADER_LEN);
632 setBufferHdr(fdb->disk, &curr_hdr);
633 fd->size += curr_hdr.fill;
634 fdb->disk->free_bytes -= curr_hdr.fill;
636 else if (!getBufferHdr(fdb->disk, &curr_hdr))
641 pg_offset = fd->seek_pos / (fdb->disk->page_size - BATTFS_HEADER_LEN);
642 addr_offset = fd->seek_pos % (fdb->disk->page_size - BATTFS_HEADER_LEN);
643 wr_len = MIN(size, (size_t)(fdb->disk->page_size - BATTFS_HEADER_LEN - addr_offset));
645 /* Handle write outside EOF */
646 if (pg_offset > fdb->max_off)
648 LOG_INFO("New page needed, pg_offset %d, pos %d\n", pg_offset, (fdb->start - fdb->disk->page_array) + pg_offset);
649 if (!getNewPage(fdb->disk, (fdb->start - fdb->disk->page_array) + pg_offset, fdb->inode, pg_offset, &curr_hdr))
651 fdb->max_off = pg_offset;
653 /* Handle cache load of a new page*/
654 else if (fdb->start[pg_offset] != fdb->disk->curr_page)
656 LOG_INFO("Re-writing page %d to %d\n", fdb->start[pg_offset], fdb->disk->page_array[fdb->disk->free_page_start]);
657 if (!loadPage(fdb->disk, fdb->start[pg_offset], &curr_hdr))
659 #warning TODO set error?
663 /* Get a free page */
664 fdb->disk->curr_page = fdb->disk->page_array[fdb->disk->free_page_start];
665 movePages(fdb->disk, fdb->disk->free_page_start + 1, -1);
667 /* Insert previous page in free blocks list */
668 LOG_INFO("Setting page %d as free\n", fdb->start[pg_offset]);
669 fdb->disk->page_array[fdb->disk->page_count - 1] = fdb->start[pg_offset];
670 /* Assign new page */
671 fdb->start[pg_offset] = fdb->disk->curr_page;
676 //LOG_INFO("writing to buffer for page %d, offset %d, size %d\n", fdb->disk->curr_page, addr_offset, wr_len);
677 if (fdb->disk->bufferWrite(fdb->disk, addr_offset, buf, wr_len) != wr_len)
679 #warning TODO set error?
681 fdb->disk->cache_dirty = true;
684 fd->seek_pos += wr_len;
685 total_write += wr_len;
687 fill_t fill_delta = MAX((int32_t)(addr_offset + wr_len) - curr_hdr.fill, (int32_t)0);
688 fdb->disk->free_bytes -= fill_delta;
689 fd->size += fill_delta;
690 curr_hdr.fill += fill_delta;
692 if (!setBufferHdr(fdb->disk, &curr_hdr))
695 //LOG_INFO("free_bytes %d, seek_pos %d, size %d, curr_hdr.fill %d\n", fdb->disk->free_bytes, fd->seek_pos, fd->size, curr_hdr.fill);
702 * Read from file \a fd \a size bytes in \a buf.
703 * \return The number of bytes read.
705 static size_t battfs_read(struct KFile *fd, void *_buf, size_t size)
707 BattFs *fdb = BATTFS_CAST(fd);
708 uint8_t *buf = (uint8_t *)_buf;
710 size_t total_read = 0;
712 pgaddr_t addr_offset;
715 if (fd->seek_pos < 0)
718 size = MIN((kfile_off_t)size, MAX(fd->size - fd->seek_pos, 0));
722 pg_offset = fd->seek_pos / (fdb->disk->page_size - BATTFS_HEADER_LEN);
723 addr_offset = fd->seek_pos % (fdb->disk->page_size - BATTFS_HEADER_LEN);
724 read_len = MIN(size, (size_t)(fdb->disk->page_size - BATTFS_HEADER_LEN - addr_offset));
726 //LOG_INFO("reading from page %d, offset %d, size %d\n", fdb->start[pg_offset], addr_offset, read_len);
728 if (diskRead(fdb->disk, fdb->start[pg_offset], addr_offset, buf, read_len) != read_len)
730 #warning TODO set error?
734 BattFsPageHeader hdr;
735 readHdr(fdb->disk, fdb->start[pg_offset], &hdr);
736 ASSERT(hdr.inode == fdb->inode);
740 fd->seek_pos += read_len;
741 total_read += read_len;
749 * Search file \a inode in \a disk using a binary search.
750 * \a last is filled with array offset of file start
751 * in disk->page_array if file is found, otherwise
752 * \a last is filled with the correct insert position
753 * for creating a file with the given \a inode.
754 * \return true if file is found, false otherwisr.
756 static bool findFile(BattFsSuper *disk, inode_t inode, pgcnt_t *last)
758 BattFsPageHeader hdr;
759 pgcnt_t first = 0, page;
760 *last = disk->free_page_start;
763 while (first < *last)
765 page = (first + *last) / 2;
766 LOG_INFO("first %d, last %d, page %d\n", first, *last, page);
767 if (!readHdr(disk, disk->page_array[page], &hdr))
769 LOG_INFO("inode read: %d\n", hdr.inode);
770 fcs = computeFcs(&hdr);
771 if (hdr.fcs == fcs && hdr.inode == inode)
773 *last = page - hdr.pgoff;
774 LOG_INFO("Found: %d\n", *last);
777 else if (hdr.fcs == fcs && hdr.inode < inode)
782 LOG_INFO("Not found: last %d\n", *last);
787 * \return true if file \a inode exists on \a disk, false otherwise.
789 bool battfs_fileExists(BattFsSuper *disk, inode_t inode)
792 return findFile(disk, inode, &dummy);
796 * Count size of file \a inode on \a disk, starting at pointer \a start
797 * in disk->page_array. Size is written in \a size.
798 * \return true if all s ok, false on disk read errors.
800 static file_size_t countFileSize(BattFsSuper *disk, pgcnt_t *start, inode_t inode)
802 file_size_t size = 0;
803 BattFsPageHeader hdr;
805 while (start < &disk->page_array[disk->free_page_start])
807 if (!readHdr(disk, *start++, &hdr))
809 if (hdr.fcs == computeFcs(&hdr) && hdr.inode == inode)
818 * Open file \a inode from \a disk in \a mode.
819 * File context is stored in \a fd.
820 * \return true if ok, false otherwise.
822 bool battfs_fileopen(BattFsSuper *disk, BattFs *fd, inode_t inode, filemode_t mode)
826 memset(fd, 0, sizeof(*fd));
828 /* Search file start point in disk page array */
830 if (!findFile(disk, inode, &start_pos))
832 LOG_INFO("file %d not found\n", inode);
833 if (!(mode & BATTFS_CREATE))
835 /* Create the file */
836 BattFsPageHeader hdr;
837 if (!(getNewPage(disk, start_pos, inode, 0, &hdr)))
840 fd->start = &disk->page_array[start_pos];
841 LOG_INFO("Start pos %d\n", start_pos);
844 if ((fd->fd.size = countFileSize(disk, fd->start, inode)) == EOF)
846 fd->max_off = fd->fd.size / (disk->page_size - BATTFS_HEADER_LEN);
848 /* Reset seek position */
851 /* Insert file handle in list, ordered by inode, ascending. */
852 FOREACH_NODE(n, &disk->file_opened_list)
854 BattFs *file = containerof(n, BattFs, link);
855 if (file->inode >= inode)
858 INSERT_BEFORE(&fd->link, n);
865 fd->fd.close = battfs_fileclose;
866 fd->fd.flush = battfs_flush;
867 fd->fd.read = battfs_read;
868 fd->fd.reopen = kfile_genericReopen;
869 fd->fd.seek = kfile_genericSeek;
870 fd->fd.write = battfs_write;
872 #warning TODO battfs_error, battfs_clearerr
874 fd->fd.error = battfs_error;
875 fd->fd.clearerr = battfs_clearerr;
878 DB(fd->fd._type = KFT_BATTFS);
886 bool battfs_close(struct BattFsSuper *disk)
891 /* Close all open files */
892 FOREACH_NODE(n, &disk->file_opened_list)
894 BattFs *file = containerof(n, BattFs, link);
895 res += battfs_fileclose(&file->fd);
899 return disk->close(disk) && (res == 0);
904 bool battfs_writeTestBlock(struct BattFsSuper *disk, pgcnt_t page, inode_t inode, seq_t seq, fill_t fill, pgoff_t pgoff)
906 BattFsPageHeader hdr;
908 /* Reset page to all 0xff */
909 uint8_t buf[disk->page_size];
910 memset(buf, 0xFF, disk->page_size);
911 disk->bufferWrite(disk, 0, buf, disk->page_size);
917 hdr.fcs = computeFcs(&hdr);
919 if (!(setBufferHdr(disk, &hdr) && disk->save(disk, page)))
921 LOG_ERR("error writing hdr\n");