* Header is actually a footer, and so
* resides at page end.
*/
- if (diskRead(disk, page, disk->page_size - BATTFS_HEADER_LEN, buf, BATTFS_HEADER_LEN)
+ if (diskRead(disk, page, disk->data_size, buf, BATTFS_HEADER_LEN)
!= BATTFS_HEADER_LEN)
{
LOG_ERR("page[%d]\n", page);
* Header is actually a footer, and so
* resides at page end.
*/
- if (disk->bufferWrite(disk, disk->page_size - BATTFS_HEADER_LEN, buf, BATTFS_HEADER_LEN)
+ if (disk->bufferWrite(disk, disk->data_size, buf, BATTFS_HEADER_LEN)
!= BATTFS_HEADER_LEN)
{
LOG_ERR("writing to buffer\n");
{
uint8_t buf[BATTFS_HEADER_LEN];
- if (disk->bufferRead(disk, disk->page_size - BATTFS_HEADER_LEN, buf, BATTFS_HEADER_LEN)
+ if (disk->bufferRead(disk, disk->data_size, buf, BATTFS_HEADER_LEN)
!= BATTFS_HEADER_LEN)
{
LOG_ERR("reading from buffer\n");
static void movePages(struct BattFsSuper *disk, pgcnt_t src, int offset)
{
pgcnt_t dst = src + offset;
- LOG_INFO("src %d, offset %d, size %ld\n", src, offset, (disk->page_count - MAX(dst, src)) * sizeof(pgcnt_t));
+ LOG_INFO("src %d, offset %d, size %d\n", src, offset, (unsigned int)((disk->page_count - MAX(dst, src)) * sizeof(pgcnt_t)));
memmove(&disk->page_array[dst], &disk->page_array[src], (disk->page_count - MAX(dst, src)) * sizeof(pgcnt_t));
if (offset < 0)
return false;
/* Increase free space */
- disk->free_bytes += disk->page_size - BATTFS_HEADER_LEN;
+ disk->free_bytes += disk->data_size;
/* Check header FCS */
if (hdr.fcs == computeFcs(&hdr))
{
- ASSERT(hdr.fill <= disk->page_size - BATTFS_HEADER_LEN);
+ ASSERT(hdr.fill <= disk->data_size);
/* Page is valid and is owned by a file */
filelen_table[hdr.inode]++;
/**
* Load \a new_page from \a disk in disk page buffer.
* If a previuos page is still dirty in the buffer, will be
- * flushed first.
+ * flushed first. The new page header loaded will be put in \a new_hdr.
* \return true if ok, false on errors.
*/
-static bool loadPage(struct BattFsSuper *disk, pgcnt_t new_page)
+static bool loadPage(struct BattFsSuper *disk, pgcnt_t new_page, BattFsPageHeader *new_hdr)
{
if (disk->curr_page == new_page)
- return true;
+ return getBufferHdr(disk, new_hdr);
LOG_INFO("Loading page %d\n", new_page);
if (!(flushBuffer(disk)
- && disk->load(disk, new_page)))
+ && disk->load(disk, new_page)
+ && getBufferHdr(disk, new_hdr)))
return false;
disk->curr_page = new_page;
* \a disk.
* \return false on errors, true otherwise.
*/
-bool battfs_init(struct BattFsSuper *disk)
+bool battfs_mount(struct BattFsSuper *disk)
{
pgoff_t filelen_table[BATTFS_MAX_FILES];
ASSERT(disk->save);
ASSERT(disk->erase);
ASSERT(disk->close);
- ASSERT(disk->page_size);
+ ASSERT(disk->page_size > BATTFS_HEADER_LEN);
+ /* Fill page_size with the usable space */
+ disk->data_size = disk->page_size - BATTFS_HEADER_LEN;
ASSERT(disk->page_count);
ASSERT(disk->page_count < PAGE_UNSET_SENTINEL - 1);
ASSERT(disk->page_array);
memset(filelen_table, 0, BATTFS_MAX_FILES * sizeof(pgoff_t));
disk->free_bytes = 0;
- disk->disk_size = (disk_size_t)(disk->page_size - BATTFS_HEADER_LEN) * disk->page_count;
+ disk->disk_size = (disk_size_t)disk->data_size * disk->page_count;
/* Initialize page buffer cache */
disk->cache_dirty = false;
LOG_ERR("filling page array\n");
return false;
}
- #if LOG_LEVEL > LOG_LVL_INFO
- dumpPageArray(disk)
+ #if LOG_LEVEL >= LOG_LVL_INFO
+ dumpPageArray(disk);
#endif
#warning TODO: shuffle free blocks
//#if LOG_LEVEL > LOG_LVL_INFO
- // dumpPageArray(disk)
+ // dumpPageArray(disk);
//#endif
/* Init list for opened files. */
LIST_INIT(&disk->file_opened_list);
return true;
}
+/**
+ * Check the filesystem.
+ * \return true if ok, false on errors.
+ */
+bool battfs_fsck(struct BattFsSuper *disk)
+{
+ #define FSCHECK(cond) do { if(!(cond)) { LOG_ERR("\"" #cond "\"\n"); return false; } } while (0)
+
+ FSCHECK(disk->free_page_start <= disk->page_count);
+ FSCHECK(disk->data_size < disk->page_size);
+ FSCHECK(disk->free_bytes <= disk->disk_size);
+
+ disk_size_t free_bytes = 0;
+ BattFsPageHeader hdr, prev_hdr;
+ inode_t files = 0;
+ pgcnt_t page_used = 0;
+
+ bool start = true;
+
+ for (pgcnt_t page = 0; page < disk->page_count; page++)
+ {
+ FSCHECK(readHdr(disk, disk->page_array[page], &hdr));
+ free_bytes += disk->data_size;
+
+ if (page < disk->free_page_start)
+ {
+ FSCHECK(computeFcs(&hdr) == hdr.fcs);
+ page_used++;
+ free_bytes -= hdr.fill;
+ if (hdr.inode != prev_hdr.inode || start)
+ {
+ if (LIKELY(!start))
+ FSCHECK(hdr.inode > prev_hdr.inode);
+ else
+ start = false;
+
+ FSCHECK(hdr.pgoff == 0);
+ files++;
+ }
+ else
+ {
+ FSCHECK(hdr.fill != 0);
+ FSCHECK(prev_hdr.fill == disk->data_size);
+ FSCHECK(hdr.pgoff == prev_hdr.pgoff + 1);
+ }
+ prev_hdr = hdr;
+ }
+ }
+
+ FSCHECK(page_used == disk->free_page_start);
+ FSCHECK(free_bytes == disk->free_bytes);
+
+ return true;
+}
+
/**
* Flush file \a fd.
* \return 0 if ok, EOF on errors.
}
-static bool getNewPage(struct BattFsSuper *disk, pgcnt_t new_pos, inode_t inode, pgoff_t pgoff)
+static bool getNewPage(struct BattFsSuper *disk, pgcnt_t new_pos, inode_t inode, pgoff_t pgoff, BattFsPageHeader *new_hdr)
{
- if (disk->free_page_start >= disk->page_count)
+ if (SPACE_OVER(disk))
{
#warning TODO space over!
- LOG_INFO("No disk space available\n");
+ LOG_ERR("No disk space available!\n");
return false;
}
flushBuffer(disk);
disk->page_array[new_pos] = disk->curr_page;
disk->cache_dirty = true;
- BattFsPageHeader hdr;
- hdr.inode = inode;
- hdr.pgoff = pgoff;
- hdr.fill = 0;
- hdr.seq = 0;
- if (!setBufferHdr(disk, &hdr))
- return false;
- else
- return true;
+ new_hdr->inode = inode;
+ new_hdr->pgoff = pgoff;
+ new_hdr->fill = 0;
+ new_hdr->seq = 0;
+ return setBufferHdr(disk, new_hdr);
}
/**
static size_t battfs_write(struct KFile *fd, const void *_buf, size_t size)
{
BattFs *fdb = BATTFS_CAST(fd);
+ BattFsSuper *disk = fdb->disk;
const uint8_t *buf = (const uint8_t *)_buf;
size_t total_write = 0;
pgoff_t pg_offset;
pgaddr_t addr_offset;
pgaddr_t wr_len;
-
BattFsPageHeader curr_hdr;
- if (!getBufferHdr(fdb->disk, &curr_hdr))
+
+ if (fd->seek_pos < 0)
return total_write;
- #warning TODO seek_pos > size?
+ if (fd->seek_pos > fd->size)
+ {
+ /* Handle writing when seek pos if far over EOF */
+ if (!loadPage(disk, fdb->start[fdb->max_off], &curr_hdr))
+ {
+ #warning TODO set error?
+ return total_write;
+ }
+
+ /* Fill unused space of first page with 0s */
+ uint8_t dummy = 0;
+ pgaddr_t zero_bytes = MIN(fd->seek_pos - fd->size, disk->data_size - curr_hdr.fill);
+ while (zero_bytes--)
+ {
+ if (disk->bufferWrite(disk, curr_hdr.fill, &dummy, 1) != 1)
+ {
+ #warning TODO set error?
+ }
+ curr_hdr.fill++;
+ fd->size++;
+ disk->free_bytes--;
+ disk->cache_dirty = true;
+ }
+ setBufferHdr(disk, &curr_hdr);
+
+ /* Allocate the missing pages first. */
+ pgoff_t missing_pages = fd->seek_pos / disk->data_size - fdb->max_off;
+
+ if (missing_pages)
+ {
+ LOG_INFO("missing pages: %d\n", missing_pages);
+ flushBuffer(disk);
+
+ /* Fill page buffer with 0 to avoid filling unused pages with garbage */
+ for (pgaddr_t off = 0; off < disk->data_size; off++)
+ {
+ if (disk->bufferWrite(disk, off, &dummy, 1) != 1)
+ {
+ #warning TODO set error?
+ }
+ }
+
+ while (missing_pages--)
+ {
+ zero_bytes = MIN((kfile_off_t)disk->data_size, fd->seek_pos - fd->size);
+ /* Get the new page needed */
+ if (!getNewPage(disk, (fdb->start - disk->page_array) + fdb->max_off + 1, fdb->inode, fdb->max_off + 1, &curr_hdr))
+ return total_write;
+
+ /* Update size and free space left */
+ fd->size += zero_bytes;
+ disk->free_bytes -= zero_bytes;
+
+ curr_hdr.fill = zero_bytes;
+ setBufferHdr(disk, &curr_hdr);
+
+ fdb->max_off++;
+ }
+ }
+ }
+ else if (!getBufferHdr(disk, &curr_hdr))
+ return total_write;
while (size)
{
- pg_offset = fd->seek_pos / (fdb->disk->page_size - BATTFS_HEADER_LEN);
- addr_offset = fd->seek_pos % (fdb->disk->page_size - BATTFS_HEADER_LEN);
- wr_len = MIN(size, (size_t)(fdb->disk->page_size - BATTFS_HEADER_LEN - addr_offset));
+ pg_offset = fd->seek_pos / disk->data_size;
+ addr_offset = fd->seek_pos % disk->data_size;
+ wr_len = MIN(size, (size_t)(disk->data_size - addr_offset));
/* Handle write outside EOF */
if (pg_offset > fdb->max_off)
{
- LOG_INFO("New page needed, pg_offset %d, pos %d\n", pg_offset, (fdb->start - fdb->disk->page_array) + pg_offset);
- if (!(getNewPage(fdb->disk, (fdb->start - fdb->disk->page_array) + pg_offset, fdb->inode, pg_offset)
- && getBufferHdr(fdb->disk, &curr_hdr)))
+ LOG_INFO("New page needed, pg_offset %d, pos %d\n", pg_offset, (int)((fdb->start - disk->page_array) + pg_offset));
+ if (!getNewPage(disk, (fdb->start - disk->page_array) + pg_offset, fdb->inode, pg_offset, &curr_hdr))
return total_write;
fdb->max_off = pg_offset;
}
/* Handle cache load of a new page*/
- else if (fdb->start[pg_offset] != fdb->disk->curr_page)
+ else if (fdb->start[pg_offset] != disk->curr_page)
{
- LOG_INFO("Re-writing page %d to %d\n", fdb->start[pg_offset], fdb->disk->page_array[fdb->disk->free_page_start]);
- if (!(loadPage(fdb->disk, fdb->start[pg_offset])
- && getBufferHdr(fdb->disk, &curr_hdr)))
+ if (SPACE_OVER(disk))
+ {
+ LOG_ERR("No disk space available!\n");
+ return total_write;
+ }
+ LOG_INFO("Re-writing page %d to %d\n", fdb->start[pg_offset], disk->page_array[disk->free_page_start]);
+ if (!loadPage(disk, fdb->start[pg_offset], &curr_hdr))
{
#warning TODO set error?
return total_write;
}
/* Get a free page */
- fdb->disk->curr_page = fdb->disk->page_array[fdb->disk->free_page_start];
- movePages(fdb->disk, fdb->disk->free_page_start + 1, -1);
+ disk->curr_page = disk->page_array[disk->free_page_start];
+ movePages(disk, disk->free_page_start + 1, -1);
/* Insert previous page in free blocks list */
LOG_INFO("Setting page %d as free\n", fdb->start[pg_offset]);
- fdb->disk->page_array[fdb->disk->page_count - 1] = fdb->start[pg_offset];
+ disk->page_array[disk->page_count - 1] = fdb->start[pg_offset];
/* Assign new page */
- fdb->start[pg_offset] = fdb->disk->curr_page;
+ fdb->start[pg_offset] = disk->curr_page;
curr_hdr.seq++;
}
-
- //LOG_INFO("writing to buffer for page %d, offset %d, size %d\n", fdb->disk->curr_page, addr_offset, wr_len);
- if (fdb->disk->bufferWrite(fdb->disk, addr_offset, buf, wr_len) != wr_len)
+ //LOG_INFO("writing to buffer for page %d, offset %d, size %d\n", disk->curr_page, addr_offset, wr_len);
+ if (disk->bufferWrite(disk, addr_offset, buf, wr_len) != wr_len)
{
#warning TODO set error?
}
- fdb->disk->cache_dirty = true;
+ disk->cache_dirty = true;
size -= wr_len;
fd->seek_pos += wr_len;
total_write += wr_len;
buf += wr_len;
fill_t fill_delta = MAX((int32_t)(addr_offset + wr_len) - curr_hdr.fill, (int32_t)0);
- fdb->disk->free_bytes -= fill_delta;
+ disk->free_bytes -= fill_delta;
fd->size += fill_delta;
curr_hdr.fill += fill_delta;
- if (!setBufferHdr(fdb->disk, &curr_hdr))
+ if (!setBufferHdr(disk, &curr_hdr))
return total_write;
- //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);
+ //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);
}
return total_write;
}
static size_t battfs_read(struct KFile *fd, void *_buf, size_t size)
{
BattFs *fdb = BATTFS_CAST(fd);
+ BattFsSuper *disk = fdb->disk;
uint8_t *buf = (uint8_t *)_buf;
size_t total_read = 0;
pgaddr_t addr_offset;
pgaddr_t read_len;
- size = MIN((kfile_off_t)size, fd->size - fd->seek_pos);
+ if (fd->seek_pos < 0)
+ return total_read;
+
+ size = MIN((kfile_off_t)size, MAX(fd->size - fd->seek_pos, 0));
while (size)
{
- pg_offset = fd->seek_pos / (fdb->disk->page_size - BATTFS_HEADER_LEN);
- addr_offset = fd->seek_pos % (fdb->disk->page_size - BATTFS_HEADER_LEN);
- read_len = MIN(size, (size_t)(fdb->disk->page_size - BATTFS_HEADER_LEN - addr_offset));
+ pg_offset = fd->seek_pos / disk->data_size;
+ addr_offset = fd->seek_pos % disk->data_size;
+ read_len = MIN(size, (size_t)(disk->data_size - addr_offset));
+ //LOG_INFO("reading from page %d, offset %d, size %d\n", fdb->start[pg_offset], addr_offset, read_len);
/* Read from disk */
- if (diskRead(fdb->disk, fdb->start[pg_offset], addr_offset, buf, read_len) != read_len)
+ if (diskRead(disk, fdb->start[pg_offset], addr_offset, buf, read_len) != read_len)
{
#warning TODO set error?
}
#if _DEBUG
BattFsPageHeader hdr;
- readHdr(fdb->disk, fdb->start[pg_offset], &hdr);
+ readHdr(disk, fdb->start[pg_offset], &hdr);
ASSERT(hdr.inode == fdb->inode);
#endif
if (!(mode & BATTFS_CREATE))
return false;
/* Create the file */
- if (!(getNewPage(disk, start_pos, inode, 0)))
+ BattFsPageHeader hdr;
+ if (!(getNewPage(disk, start_pos, inode, 0, &hdr)))
return false;
}
fd->start = &disk->page_array[start_pos];
/* Fill file size */
if ((fd->fd.size = countFileSize(disk, fd->start, inode)) == EOF)
return false;
- fd->max_off = fd->fd.size / (disk->page_size - BATTFS_HEADER_LEN);
+ fd->max_off = fd->fd.size / disk->data_size;
/* Reset seek position */
fd->fd.seek_pos = 0;
}
/**
- * Close \a disk.
+ * Umount \a disk.
*/
-bool battfs_close(struct BattFsSuper *disk)
+bool battfs_umount(struct BattFsSuper *disk)
{
Node *n;
int res = 0;
projects / bertos.git / blobdiff