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>
42 #include "cfg/cfg_battfs.h"
43 #include <cfg/debug.h>
44 #include <cfg/macros.h> /* MIN, MAX */
46 #include <cpu/byteorder.h> /* cpu_to_xx */
48 #define LOG_LEVEL BATTFS_LOG_LEVEL
49 #define LOG_FORMAT BATTFS_LOG_FORMAT
52 #include <string.h> /* memset, memmove */
54 #if LOG_LEVEL >= LOG_LVL_INFO
55 static void dumpPageArray(struct BattFsSuper *disk)
57 kprintf("Page array dump, free_page_start %d:", disk->free_page_start);
58 for (pgcnt_t i = 0; i < disk->dev->blk_cnt; i++)
62 kprintf("%04d ", disk->page_array[i]);
69 * Convert from memory representation to disk structure.
70 * \note filesystem is in little-endian format.
72 INLINE void battfs_to_disk(struct BattFsPageHeader *hdr, uint8_t *buf)
74 STATIC_ASSERT(BATTFS_HEADER_LEN == 12);
78 buf[2] = hdr->fill >> 8;
81 buf[4] = hdr->pgoff >> 8;
84 * Sequence number is 40 bits long.
85 * No need to take care of wraparonds: the memory will die first!
88 buf[6] = hdr->seq >> 8;
89 buf[7] = hdr->seq >> 16;
90 buf[8] = hdr->seq >> 24;
91 buf[9] = hdr->seq >> 32;
94 * This field must be the last one!
95 * This is needed because if the page is only partially
96 * written, we can use this to detect it.
99 buf[11] = hdr->fcs >> 8;
103 * Convert from disk structure to memory representation.
104 * \note filesystem is in little-endian format.
106 INLINE void disk_to_battfs(uint8_t *buf, struct BattFsPageHeader *hdr)
108 STATIC_ASSERT(BATTFS_HEADER_LEN == 12);
110 hdr->fill = buf[2] << 8 | buf[1];
111 hdr->pgoff = buf[4] << 8 | buf[3];
112 hdr->seq = (seq_t)buf[9] << 32 | (seq_t)buf[8] << 24 | (seq_t)buf[7] << 16 | buf[6] << 8 | buf[5];
113 hdr->fcs = buf[11] << 8 | buf[10];
117 * Compute the fcs of the header.
119 static fcs_t computeFcs(struct BattFsPageHeader *hdr)
121 uint8_t buf[BATTFS_HEADER_LEN];
124 battfs_to_disk(hdr, buf);
126 /* fcs is at the end of whole header */
127 rotating_update(buf, BATTFS_HEADER_LEN - sizeof(fcs_t), &cks);
132 * Read header of \a page in \a hdr.
133 * \return true on success, false otherwise.
135 static bool readHdr(struct BattFsSuper *disk, pgcnt_t page, struct BattFsPageHeader *hdr)
137 uint8_t buf[BATTFS_HEADER_LEN];
140 * Read header from disk.
141 * Header is actually a footer, and so
142 * resides at page end.
144 if (kblock_read(disk->dev, page, buf, disk->data_size, BATTFS_HEADER_LEN)
145 != BATTFS_HEADER_LEN)
147 LOG_ERR("page[%d]\n", page);
152 disk_to_battfs(buf, hdr);
157 static bool writeHdr(struct BattFsSuper *disk, pgcnt_t page, struct BattFsPageHeader *hdr)
159 uint8_t buf[BATTFS_HEADER_LEN];
161 #warning FIXME:refactor computeFcs to save time and stack
162 hdr->fcs = computeFcs(hdr);
164 battfs_to_disk(hdr, buf);
167 * write header to disk.
168 * Header is actually a footer, and so
169 * resides at page end.
171 if (kblock_write(disk->dev, page, buf, disk->data_size, BATTFS_HEADER_LEN)
172 != BATTFS_HEADER_LEN)
174 LOG_ERR("writing to buffer\n");
182 * Count the number of pages from
183 * inode 0 to \a inode in \a filelen_table.
185 static pgcnt_t countPages(pgoff_t *filelen_table, inode_t inode)
189 for (inode_t i = 0; i < inode; i++)
190 cnt += filelen_table[i];
196 * Move all pages in page allocation array from \a src to \a src + \a offset.
197 * The number of pages moved is page_count - MAX(dst, src).
199 static void movePages(struct BattFsSuper *disk, pgcnt_t src, int offset)
201 pgcnt_t dst = src + offset;
202 LOG_INFO("src %d, offset %d, size %d\n", src, offset, (unsigned int)((disk->dev->blk_cnt - MAX(dst, src)) * sizeof(pgcnt_t)));
203 memmove(&disk->page_array[dst], &disk->page_array[src], (disk->dev->blk_cnt - MAX(dst, src)) * sizeof(pgcnt_t));
207 /* Fill empty space in array with sentinel */
208 for (pgcnt_t page = disk->dev->blk_cnt + offset; page < disk->dev->blk_cnt; page++)
209 disk->page_array[page] = PAGE_UNSET_SENTINEL;
214 * Count number of pages per file on \a disk.
215 * This information is registered in \a filelen_table.
216 * Array index represent file inode, while value contained
217 * is the number of pages used by that file.
219 * \return true if ok, false on disk read errors.
220 * \note The whole disk is scanned once.
222 static bool countDiskFilePages(struct BattFsSuper *disk, pgoff_t *filelen_table)
224 BattFsPageHeader hdr;
225 disk->free_page_start = 0;
227 /* Count the number of disk page per file */
228 for (pgcnt_t page = 0; page < disk->dev->blk_cnt; page++)
230 if (!readHdr(disk, page, &hdr))
233 /* Increase free space */
234 disk->free_bytes += disk->data_size;
236 /* Check header FCS */
237 if (hdr.fcs == computeFcs(&hdr))
239 ASSERT(hdr.fill <= disk->data_size);
241 /* Page is valid and is owned by a file */
242 filelen_table[hdr.inode]++;
244 /* Keep trace of free space */
245 disk->free_bytes -= hdr.fill;
246 disk->free_page_start++;
249 LOG_INFO("free_bytes:%ld, free_page_start:%d\n", (long)disk->free_bytes, disk->free_page_start);
255 * Fill page allocation array of \a disk
256 * using file lenghts in \a filelen_table.
258 * The page allocation array is an array containings all file infos.
259 * Is ordered by file, and within each file is ordered by page offset
261 * e.g. : at page array[0] you will find page address of the first page
262 * of the first file (if present).
263 * Free blocks are allocated after the last file.
265 * \return true if ok, false on disk read errors.
266 * \note The whole disk is scanned at max twice.
268 static bool fillPageArray(struct BattFsSuper *disk, pgoff_t *filelen_table)
270 BattFsPageHeader hdr;
271 pgcnt_t curr_free_page = disk->free_page_start;
272 /* Fill page allocation array */
273 for (pgcnt_t page = 0; page < disk->dev->blk_cnt; page++)
275 if (!readHdr(disk, page, &hdr))
278 /* Check header FCS */
279 if (hdr.fcs == computeFcs(&hdr))
281 /* Compute array position */
282 pgcnt_t array_pos = countPages(filelen_table, hdr.inode);
283 array_pos += hdr.pgoff;
286 /* Check if position is already used by another page of the same file */
287 if (disk->page_array[array_pos] == PAGE_UNSET_SENTINEL)
288 disk->page_array[array_pos] = page;
291 BattFsPageHeader hdr_prv;
293 if (!readHdr(disk, disk->page_array[array_pos], &hdr_prv))
296 /* Check header FCS */
297 ASSERT(hdr_prv.fcs == computeFcs(&hdr_prv));
299 /* Only the very same page with a different seq number can be here */
300 ASSERT(hdr.inode == hdr_prv.inode);
301 ASSERT(hdr.pgoff == hdr_prv.pgoff);
302 ASSERT(hdr.seq != hdr_prv.seq);
304 pgcnt_t new_page, old_page;
308 * Sequence number comparison: since
309 * seq is 40 bits wide, it wraps once
310 * every 1.1E12 times.
311 * The memory will not live enough to
312 * see a wraparound, so we can use a simple
315 if (hdr.seq > hdr_prv.seq)
317 /* Current header is newer than the previuos one */
318 old_page = disk->page_array[array_pos];
320 old_fill = hdr_prv.fill;
324 /* Previous header is newer than the current one */
326 new_page = disk->page_array[array_pos];
331 disk->page_array[array_pos] = new_page;
333 disk->free_bytes += old_fill;
334 /* Shift all array one position to the left, overwriting duplicate page */
335 array_pos -= hdr.pgoff;
336 array_pos += filelen_table[hdr.inode];
337 movePages(disk, array_pos, -1);
338 /* Move back all indexes */
339 filelen_table[hdr.inode]--;
340 disk->free_page_start--;
342 /* Set old page as free */
343 ASSERT(disk->page_array[curr_free_page] == PAGE_UNSET_SENTINEL);
344 disk->page_array[curr_free_page++] = old_page;
350 /* Invalid page, keep as free */
351 ASSERT(disk->page_array[curr_free_page] == PAGE_UNSET_SENTINEL);
352 //LOG_INFO("Page %d invalid, keeping as free\n", page);
353 disk->page_array[curr_free_page++] = page;
361 * Initialize and mount disk described by
363 * \return false on errors, true otherwise.
365 bool battfs_mount(struct BattFsSuper *disk, struct KBlock *dev, pgcnt_t *page_array, size_t array_size)
367 pgoff_t filelen_table[BATTFS_MAX_FILES];
372 ASSERT(disk->dev->blk_size > BATTFS_HEADER_LEN);
373 /* Fill page_size with the usable space */
374 disk->data_size = disk->dev->blk_size - BATTFS_HEADER_LEN;
375 ASSERT(disk->dev->blk_cnt);
376 ASSERT(disk->dev->blk_cnt < PAGE_UNSET_SENTINEL - 1);
378 disk->page_array = page_array;
379 ASSERT(array_size >= disk->dev->blk_cnt * sizeof(pgcnt_t));
381 memset(filelen_table, 0, BATTFS_MAX_FILES * sizeof(pgoff_t));
383 disk->free_bytes = 0;
384 disk->disk_size = (disk_size_t)disk->data_size * disk->dev->blk_cnt;
386 /* Count pages per file */
387 if (!countDiskFilePages(disk, filelen_table))
389 LOG_ERR("counting file pages\n");
393 /* Once here, we have filelen_table filled with file lengths */
395 /* Fill page array with sentinel */
396 for (pgcnt_t page = 0; page < disk->dev->blk_cnt; page++)
397 disk->page_array[page] = PAGE_UNSET_SENTINEL;
399 /* Fill page allocation array using filelen_table */
400 if (!fillPageArray(disk, filelen_table))
402 LOG_ERR("filling page array\n");
405 #if LOG_LEVEL >= LOG_LVL_INFO
408 #if CONFIG_BATTFS_SHUFFLE_FREE_PAGES
409 SHUFFLE(&disk->page_array[disk->free_page_start], disk->dev->blk_cnt - disk->free_page_start);
411 LOG_INFO("Page array after shuffle:\n");
412 #if LOG_LEVEL >= LOG_LVL_INFO
416 /* Init list for opened files. */
417 LIST_INIT(&disk->file_opened_list);
422 * Check the filesystem.
423 * \return true if ok, false on errors.
425 bool battfs_fsck(struct BattFsSuper *disk)
427 #define FSCHECK(cond) do { if(!(cond)) { LOG_ERR("\"" #cond "\"\n"); return false; } } while (0)
429 FSCHECK(disk->free_page_start <= disk->dev->blk_cnt);
430 FSCHECK(disk->data_size < disk->dev->blk_size);
431 FSCHECK(disk->free_bytes <= disk->disk_size);
433 disk_size_t free_bytes = 0;
434 BattFsPageHeader hdr, prev_hdr;
436 pgcnt_t page_used = 0;
440 /* Uneeded, the first time will be overwritten but useful to silence
441 * the warning for uninitialized value */
442 FSCHECK(readHdr(disk, 0, &prev_hdr));
443 for (pgcnt_t page = 0; page < disk->dev->blk_cnt; page++)
445 FSCHECK(readHdr(disk, disk->page_array[page], &hdr));
446 free_bytes += disk->data_size;
448 if (page < disk->free_page_start)
450 FSCHECK(computeFcs(&hdr) == hdr.fcs);
452 free_bytes -= hdr.fill;
453 if (hdr.inode != prev_hdr.inode || start)
456 FSCHECK(hdr.inode > prev_hdr.inode);
460 FSCHECK(hdr.pgoff == 0);
465 FSCHECK(hdr.fill != 0);
466 FSCHECK(prev_hdr.fill == disk->data_size);
467 FSCHECK(hdr.pgoff == prev_hdr.pgoff + 1);
473 FSCHECK(page_used == disk->free_page_start);
474 FSCHECK(free_bytes == disk->free_bytes);
481 * \return 0 if ok, EOF on errors.
483 static int battfs_flush(struct KFile *fd)
485 BattFs *fdb = BATTFS_CAST(fd);
487 if (kblock_flush(fdb->disk->dev) == 0)
491 fdb->errors |= BATTFS_DISK_FLUSHBUF_ERR;
498 * \return 0 if ok, EOF on errors.
500 static int battfs_fileclose(struct KFile *fd)
502 BattFs *fdb = BATTFS_CAST(fd);
504 if (battfs_flush(fd) == 0)
513 #define NO_SPACE PAGE_UNSET_SENTINEL
515 static pgcnt_t allocateNewPage(struct BattFsSuper *disk, pgcnt_t new_pos, inode_t inode)
517 if (SPACE_OVER(disk))
519 LOG_ERR("No disk space available!\n");
523 LOG_INFO("Getting new page %d, pos %d\n", disk->page_array[disk->free_page_start], new_pos);
524 pgcnt_t new_page = disk->page_array[disk->free_page_start++];
525 memmove(&disk->page_array[new_pos + 1], &disk->page_array[new_pos], (disk->free_page_start - new_pos - 1) * sizeof(pgcnt_t));
528 /* Move following file start point one position ahead. */
529 FOREACH_NODE(n, &disk->file_opened_list)
531 BattFs *file = containerof(n, BattFs, link);
532 if (file->inode > inode)
534 LOG_INFO("Move file %d start pos\n", file->inode);
539 disk->page_array[new_pos] = new_page;
543 static pgcnt_t renewPage(struct BattFsSuper *disk, pgcnt_t old_pos)
545 if (SPACE_OVER(disk))
547 LOG_ERR("No disk space available!\n");
551 /* Get a free page */
552 pgcnt_t new_page = disk->page_array[disk->free_page_start];
553 movePages(disk, disk->free_page_start + 1, -1);
555 /* Insert previous page in free blocks list */
556 LOG_INFO("Setting page %d as free\n", old_pos);
557 disk->page_array[disk->dev->blk_cnt - 1] = old_pos;
562 * Write to file \a fd \a size bytes from \a buf.
563 * \return The number of bytes written.
565 static size_t battfs_write(struct KFile *fd, const void *_buf, size_t size)
567 BattFs *fdb = BATTFS_CAST(fd);
568 BattFsSuper *disk = fdb->disk;
569 const uint8_t *buf = (const uint8_t *)_buf;
571 size_t total_write = 0;
573 pgaddr_t addr_offset;
575 BattFsPageHeader curr_hdr;
578 if (fd->seek_pos < 0)
580 fdb->errors |= BATTFS_NEGATIVE_SEEK_ERR;
584 if (fd->seek_pos > fd->size)
586 // TODO: renew this last page only if needed
587 if (!readHdr(disk, fdb->start[fdb->max_off], &curr_hdr))
589 fdb->errors |= BATTFS_DISK_READ_ERR;
593 new_page = renewPage(disk, fdb->start[fdb->max_off]);
594 if (new_page == NO_SPACE)
596 fdb->errors |= BATTFS_DISK_SPACEOVER_ERR;
600 kblock_copy(disk->dev, fdb->start[fdb->max_off], new_page);
601 fdb->start[fdb->max_off] = new_page;
603 /* Fill unused space of first page with 0s */
605 // TODO: write in blocks to speed up things
606 pgaddr_t zero_bytes = MIN(fd->seek_pos - fd->size, (kfile_off_t)(disk->data_size - curr_hdr.fill));
609 if (kblock_write(disk->dev, new_page, &dummy, curr_hdr.fill, 1) != 1)
611 fdb->errors |= BATTFS_DISK_WRITE_ERR;
619 if (!writeHdr(disk, new_page, &curr_hdr))
621 fdb->errors |= BATTFS_DISK_WRITE_ERR;
625 /* Allocate the missing pages first. */
626 pgoff_t missing_pages = fd->seek_pos / disk->data_size - fdb->max_off;
628 LOG_INFO("missing pages: %d\n", missing_pages);
630 while (missing_pages--)
632 zero_bytes = MIN((kfile_off_t)disk->data_size, fd->seek_pos - fd->size);
634 new_page = allocateNewPage(disk, (fdb->start - disk->page_array) + fdb->max_off + 1, fdb->inode);
635 if (new_page == NO_SPACE)
637 fdb->errors |= BATTFS_DISK_SPACEOVER_ERR;
642 // TODO: write in blocks to speed up things
643 /* Fill page buffer with 0 to avoid filling unused pages with garbage */
644 for (pgaddr_t off = 0; off < disk->data_size; off++)
646 if (kblock_write(disk->dev, new_page, &dummy, off, 1) != 1)
648 fdb->errors |= BATTFS_DISK_WRITE_ERR;
652 curr_hdr.inode = fdb->inode;
653 curr_hdr.pgoff = ++fdb->max_off;
654 curr_hdr.fill = zero_bytes;
657 if (!writeHdr(disk, new_page, &curr_hdr))
659 fdb->errors |= BATTFS_DISK_WRITE_ERR;
663 /* Update size and free space left */
664 fd->size += zero_bytes;
665 disk->free_bytes -= zero_bytes;
671 pg_offset = fd->seek_pos / disk->data_size;
672 addr_offset = fd->seek_pos % disk->data_size;
673 wr_len = MIN(size, (size_t)(disk->data_size - addr_offset));
675 /* Handle write outside EOF */
676 if (pg_offset > fdb->max_off)
678 LOG_INFO("New page needed, pg_offset %d, pos %d\n", pg_offset, (int)((fdb->start - disk->page_array) + pg_offset));
680 new_page = allocateNewPage(disk, (fdb->start - disk->page_array) + pg_offset, fdb->inode);
681 if (new_page == NO_SPACE)
683 fdb->errors |= BATTFS_DISK_SPACEOVER_ERR;
687 curr_hdr.inode = fdb->inode;
688 curr_hdr.pgoff = pg_offset;
691 fdb->max_off = pg_offset;
695 // TODO: do not renew page if its cached
696 if (!readHdr(disk, fdb->start[pg_offset], &curr_hdr))
698 fdb->errors |= BATTFS_DISK_READ_ERR;
702 new_page = renewPage(disk, fdb->start[pg_offset]);
703 if (new_page == NO_SPACE)
705 fdb->errors |= BATTFS_DISK_SPACEOVER_ERR;
709 LOG_INFO("Re-writing page %d to %d\n", fdb->start[pg_offset], new_page);
710 if (kblock_copy(disk->dev, fdb->start[pg_offset], new_page) != 0)
712 fdb->errors |= BATTFS_DISK_WRITE_ERR;
715 fdb->start[pg_offset] = new_page;
718 //LOG_INFO("writing to buffer for page %d, offset %d, size %d\n", disk->curr_page, addr_offset, wr_len);
719 if (kblock_write(disk->dev, new_page, buf, addr_offset, wr_len) != wr_len)
721 fdb->errors |= BATTFS_DISK_WRITE_ERR;
726 fd->seek_pos += wr_len;
727 total_write += wr_len;
729 fill_t fill_delta = MAX((int32_t)(addr_offset + wr_len) - curr_hdr.fill, (int32_t)0);
730 disk->free_bytes -= fill_delta;
731 fd->size += fill_delta;
732 curr_hdr.fill += fill_delta;
734 if (!writeHdr(disk, new_page, &curr_hdr))
736 fdb->errors |= BATTFS_DISK_WRITE_ERR;
740 //LOG_INFO("free_bytes %d, seek_pos %d, size %d, curr_hdr.fill %d\n", disk->free_bytes, fd->seek_pos, fd->size, curr_hdr.fill);
747 * Read from file \a fd \a size bytes in \a buf.
748 * \return The number of bytes read.
750 static size_t battfs_read(struct KFile *fd, void *_buf, size_t size)
752 BattFs *fdb = BATTFS_CAST(fd);
753 BattFsSuper *disk = fdb->disk;
754 uint8_t *buf = (uint8_t *)_buf;
756 size_t total_read = 0;
758 pgaddr_t addr_offset;
761 if (fd->seek_pos < 0)
763 fdb->errors |= BATTFS_NEGATIVE_SEEK_ERR;
767 size = MIN((kfile_off_t)size, MAX(fd->size - fd->seek_pos, (kfile_off_t)0));
771 pg_offset = fd->seek_pos / disk->data_size;
772 addr_offset = fd->seek_pos % disk->data_size;
773 read_len = MIN(size, (size_t)(disk->data_size - addr_offset));
775 //LOG_INFO("reading from page %d, offset %d, size %d\n", fdb->start[pg_offset], addr_offset, read_len);
777 if (kblock_read(disk->dev, fdb->start[pg_offset], buf, addr_offset, read_len) != read_len)
779 fdb->errors |= BATTFS_DISK_READ_ERR;
784 BattFsPageHeader hdr;
785 readHdr(disk, fdb->start[pg_offset], &hdr);
786 ASSERT(hdr.inode == fdb->inode);
790 fd->seek_pos += read_len;
791 total_read += read_len;
799 * Search file \a inode in \a disk using a binary search.
800 * \a last is filled with array offset of file start
801 * in disk->page_array if file is found, otherwise
802 * \a last is filled with the correct insert position
803 * for creating a file with the given \a inode.
804 * \return true if file is found, false otherwisr.
806 static bool findFile(BattFsSuper *disk, inode_t inode, pgcnt_t *last)
808 BattFsPageHeader hdr;
809 pgcnt_t first = 0, page;
810 *last = disk->free_page_start;
813 while (first < *last)
815 page = (first + *last) / 2;
816 LOG_INFO("first %d, last %d, page %d\n", first, *last, page);
817 if (!readHdr(disk, disk->page_array[page], &hdr))
819 LOG_INFO("inode read: %d\n", hdr.inode);
820 fcs = computeFcs(&hdr);
821 if (hdr.fcs == fcs && hdr.inode == inode)
823 *last = page - hdr.pgoff;
824 LOG_INFO("Found: %d\n", *last);
827 else if (hdr.fcs == fcs && hdr.inode < inode)
832 LOG_INFO("Not found: last %d\n", *last);
837 * \return true if file \a inode exists on \a disk, false otherwise.
839 bool battfs_fileExists(BattFsSuper *disk, inode_t inode)
842 return findFile(disk, inode, &dummy);
846 * Count size of file \a inode on \a disk, starting at pointer \a start
847 * in disk->page_array. Size is written in \a size.
848 * \return true if all s ok, false on disk read errors.
850 static file_size_t countFileSize(BattFsSuper *disk, pgcnt_t *start, inode_t inode)
852 file_size_t size = 0;
853 BattFsPageHeader hdr;
855 while (start < &disk->page_array[disk->free_page_start])
857 if (!readHdr(disk, *start++, &hdr))
859 if (hdr.fcs == computeFcs(&hdr) && hdr.inode == inode)
867 static int battfs_error(struct KFile *fd)
869 BattFs *fdb = BATTFS_CAST(fd);
874 static void battfs_clearerr(struct KFile *fd)
876 BattFs *fdb = BATTFS_CAST(fd);
881 * Open file \a inode from \a disk in \a mode.
882 * File context is stored in \a fd.
883 * \return true if ok, false otherwise.
885 bool battfs_fileopen(BattFsSuper *disk, BattFs *fd, inode_t inode, filemode_t mode)
889 memset(fd, 0, sizeof(*fd));
891 /* Search file start point in disk page array */
893 if (!findFile(disk, inode, &start_pos))
895 LOG_INFO("file %d not found\n", inode);
896 if (!(mode & BATTFS_CREATE))
898 fd->errors |= BATTFS_FILE_NOT_FOUND_ERR;
901 /* Create the file */
902 BattFsPageHeader hdr;
904 if (allocateNewPage(disk, start_pos, inode) == NO_SPACE)
906 fd->errors |= BATTFS_DISK_SPACEOVER_ERR;
914 if (!writeHdr(disk, disk->page_array[start_pos], &hdr))
916 fd->errors |= BATTFS_DISK_WRITE_ERR;
920 fd->start = &disk->page_array[start_pos];
921 LOG_INFO("Start pos %d\n", start_pos);
924 if ((fd->fd.size = countFileSize(disk, fd->start, inode)) == EOF)
926 fd->errors |= BATTFS_DISK_READ_ERR;
929 fd->max_off = fd->fd.size / disk->data_size;
931 /* Reset seek position */
934 /* Insert file handle in list, ordered by inode, ascending. */
935 FOREACH_NODE(n, &disk->file_opened_list)
937 BattFs *file = containerof(n, BattFs, link);
938 if (file->inode >= inode)
941 INSERT_BEFORE(&fd->link, n);
948 fd->fd.close = battfs_fileclose;
949 fd->fd.flush = battfs_flush;
950 fd->fd.read = battfs_read;
951 fd->fd.reopen = kfile_genericReopen;
952 fd->fd.seek = kfile_genericSeek;
953 fd->fd.write = battfs_write;
955 fd->fd.error = battfs_error;
956 fd->fd.clearerr = battfs_clearerr;
958 DB(fd->fd._type = KFT_BATTFS);
967 bool battfs_umount(struct BattFsSuper *disk)
972 /* Close all open files */
973 FOREACH_NODE(n, &disk->file_opened_list)
975 BattFs *file = containerof(n, BattFs, link);
976 res += battfs_fileclose(&file->fd);
980 return (kblock_flush(disk->dev) == 0) && (kblock_close(disk->dev) == 0) && (res == 0);
985 void battfs_writeTestBlock(KBlock *dev, pgcnt_t page, inode_t inode, seq_t seq, fill_t fill, pgoff_t pgoff)
987 uint8_t buf[BATTFS_HEADER_LEN];
988 battfs_eraseBlock(dev, page);
990 BattFsPageHeader hdr;
995 hdr.fcs = computeFcs(&hdr);
997 battfs_to_disk(&hdr, buf);
999 ASSERT(kblock_write(dev, page, buf, dev->blk_size - BATTFS_HEADER_LEN, BATTFS_HEADER_LEN) == BATTFS_HEADER_LEN);
1000 ASSERT(kblock_flush(dev) == 0);
1003 void battfs_eraseBlock(KBlock *dev, pgcnt_t page)
1005 /* Reset page to all 0xff */
1006 uint8_t buf[dev->blk_size];
1007 memset(buf, 0xFF, dev->blk_size);
1008 ASSERT(kblock_write(dev, page, buf, 0, dev->blk_size) == dev->blk_size);
1009 ASSERT(kblock_flush(dev) == 0);