activated EOF hints and fixed a bug in the garbage collector.
This commit is contained in:
nvt-se
parent
d28b27f031
commit
e483f335ce
1 changed files with 140 additions and 82 deletions
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@ -43,6 +43,7 @@
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#include "cfs/cfs-coffee.h"
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#include "dev/watchdog.h"
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#include <limits.h>
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#include <string.h>
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#define DEBUG 0
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@ -66,36 +67,38 @@
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#define COFFEE_FD_APPEND 0x4
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#define COFFEE_FD_FREE 0x0
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#define COFFEE_PAGE_COUNT (COFFEE_SIZE / COFFEE_PAGE_SIZE)
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#define COFFEE_PAGES_PER_SECTOR (COFFEE_SECTOR_SIZE / COFFEE_PAGE_SIZE)
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#define COFFEE_FLAG_VALID 0x1
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#define COFFEE_FLAG_ALLOCATED 0x2
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#define COFFEE_FLAG_OBSOLETE 0x4
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#define COFFEE_FLAG_MODIFIED 0x8
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#define COFFEE_FLAG_LOG 0x10
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#define LOG_CMD_MAGIC 0x7a
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#define COFFEE_PAGE_ALLOCATED(hdr) ((hdr).flags & COFFEE_FLAG_ALLOCATED)
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#define COFFEE_PAGE_FREE(hdr) !COFFEE_PAGE_ALLOCATED(hdr)
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#define COFFEE_PAGE_OBSOLETE(hdr) ((hdr).flags & COFFEE_FLAG_OBSOLETE)
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#define COFFEE_PAGE_ACTIVE(hdr) \
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(COFFEE_PAGE_ALLOCATED(hdr) && !COFFEE_PAGE_OBSOLETE(hdr))
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#define COFFEE_PAGE_LOG(hdr) ((hdr).flags & COFFEE_FLAG_LOG)
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#define COFFEE_PAGE_MODIFIED(hdr) ((hdr).flags & COFFEE_FLAG_MODIFIED)
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#define FD_VALID(fd) \
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((fd) < COFFEE_FD_SET_SIZE && coffee_fd_set[(fd)].flags != COFFEE_FD_FREE)
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((fd) < COFFEE_FD_SET_SIZE && \
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coffee_fd_set[(fd)].flags != COFFEE_FD_FREE)
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#define FD_READABLE(fd) (coffee_fd_set[(fd)].flags & CFS_READ)
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#define FD_WRITABLE(fd) (coffee_fd_set[(fd)].flags & CFS_WRITE)
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#define FD_APPENDABLE(fd) (coffee_fd_set[(fd)].flags & CFS_APPEND)
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#define READ_HEADER(hdr, page) \
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COFFEE_READ((hdr), sizeof (*hdr), (page) * COFFEE_PAGE_SIZE)
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/* File header flags. */
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#define COFFEE_FLAG_VALID 0x1 /* Completely written header. */
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#define COFFEE_FLAG_ALLOCATED 0x2 /* Allocated file. */
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#define COFFEE_FLAG_OBSOLETE 0x4 /* File marked for GC. */
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#define COFFEE_FLAG_MODIFIED 0x8 /* Modified file, log exists. */
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#define COFFEE_FLAG_LOG 0x10 /* Log file. */
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#define COFFEE_FLAG_ISOLATED 0x20 /* Isolated page. */
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#define COFFEE_PAGE_ALLOCATED(hdr) ((hdr).flags & COFFEE_FLAG_ALLOCATED)
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#define COFFEE_PAGE_FREE(hdr) !COFFEE_PAGE_ALLOCATED(hdr)
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#define COFFEE_PAGE_LOG(hdr) ((hdr).flags & COFFEE_FLAG_LOG)
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#define COFFEE_PAGE_MODIFIED(hdr) ((hdr).flags & COFFEE_FLAG_MODIFIED)
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#define COFFEE_PAGE_ISOLATED(hdr) ((hdr).flags & COFFEE_FLAG_ISOLATED)
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#define COFFEE_PAGE_OBSOLETE(hdr) ((hdr).flags & COFFEE_FLAG_OBSOLETE)
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#define COFFEE_PAGE_ACTIVE(hdr) (COFFEE_PAGE_ALLOCATED(hdr) && \
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!COFFEE_PAGE_OBSOLETE(hdr) && \
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!COFFEE_PAGE_ISOLATED(hdr))
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#define COFFEE_PAGE_COUNT (COFFEE_SIZE / COFFEE_PAGE_SIZE)
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#define COFFEE_PAGES_PER_SECTOR (COFFEE_SECTOR_SIZE / COFFEE_PAGE_SIZE)
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#define READ_HEADER(hdr, page) \
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COFFEE_READ((hdr), sizeof(*hdr), (page) * COFFEE_PAGE_SIZE)
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#define WRITE_HEADER(hdr, page) \
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COFFEE_WRITE((hdr), sizeof (*hdr), (page) * COFFEE_PAGE_SIZE)
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COFFEE_WRITE((hdr), sizeof(*hdr), (page) * COFFEE_PAGE_SIZE)
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struct file_desc {
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uint32_t offset;
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@ -130,7 +133,7 @@ struct log_param {
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#define ABS_OFFSET(file_page, file_offset) \
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((file_page) * COFFEE_PAGE_SIZE + \
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sizeof (struct file_header) + (file_offset))
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sizeof(struct file_header) + (file_offset))
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static struct dir_cache dir_cache[COFFEE_DIR_CACHE_ENTRIES];
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static struct file_desc coffee_fd_set[COFFEE_FD_SET_SIZE];
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@ -139,11 +142,12 @@ static struct file_desc coffee_fd_set[COFFEE_FD_SET_SIZE];
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static void
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get_sector_status(uint16_t sector, uint16_t *active,
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uint16_t *free, uint16_t *obsolete) {
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uint32_t offset;
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uint32_t offset, sector_start;
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uint32_t end;
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struct file_header hdr;
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static int16_t skip_pages;
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static int last_pages_are_active;
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int i;
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*active = *free = *obsolete = 0;
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if(sector == 0) {
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@ -159,16 +163,31 @@ get_sector_status(uint16_t sector, uint16_t *active,
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return;
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}
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sector_start = sector * COFFEE_SECTOR_SIZE;
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if(last_pages_are_active) {
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*active = skip_pages;
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} else {
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*obsolete = skip_pages;
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/* Split an obsolete file starting in the previous sector and mark
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the following pages as isolated. */
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offset = sector_start;
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for(i = 0; i < skip_pages; i++) {
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COFFEE_READ(&hdr, sizeof(hdr), offset);
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hdr.flags |= COFFEE_FLAG_ISOLATED;
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COFFEE_WRITE(&hdr, sizeof(hdr), offset);
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offset += COFFEE_PAGE_SIZE;
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}
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offset = sector * COFFEE_SECTOR_SIZE + skip_pages * COFFEE_PAGE_SIZE;
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PRINTF("Coffee: Isolated %u pages starting in sector %d\n",
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(unsigned)skip_pages, (int)sector);
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}
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offset = sector_start + skip_pages * COFFEE_PAGE_SIZE;
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end = (sector + 1) * COFFEE_SECTOR_SIZE;
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while(offset < end) {
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COFFEE_READ(&hdr, sizeof (hdr), offset);
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COFFEE_READ(&hdr, sizeof(hdr), offset);
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if(COFFEE_PAGE_ACTIVE(hdr)) {
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last_pages_are_active = 1;
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offset += hdr.max_pages * COFFEE_PAGE_SIZE;
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@ -177,6 +196,10 @@ get_sector_status(uint16_t sector, uint16_t *active,
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last_pages_are_active = 0;
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offset += hdr.max_pages * COFFEE_PAGE_SIZE;
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*obsolete += hdr.max_pages;
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} else if(COFFEE_PAGE_ISOLATED(hdr)) {
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last_pages_are_active = 0;
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offset += COFFEE_PAGE_SIZE;
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*obsolete++;
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} else if(COFFEE_PAGE_FREE(hdr)) {
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*free = (end - offset) / COFFEE_PAGE_SIZE;
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break;
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@ -262,6 +285,8 @@ find_file(const char *name)
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page += hdr.max_pages;
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} else if(COFFEE_PAGE_OBSOLETE(hdr)) {
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page += hdr.max_pages;
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} else if(COFFEE_PAGE_ISOLATED(hdr)) {
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++page;
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} else {
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/* It follows from the properties of the page allocation algorithm
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that if a free page is encountered, then the rest of the sector
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@ -281,26 +306,39 @@ find_offset_in_file(int first_page)
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unsigned char buf[COFFEE_PAGE_SIZE];
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int page;
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int i;
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int search_limit, range_start, range_end, part_size;
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READ_HEADER(&hdr, first_page);
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for(search_limit = i = 0; i < sizeof(hdr.eof_hint) * CHAR_BIT; i++) {
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if(hdr.eof_hint >> i) {
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search_limit = i + 1;
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}
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}
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part_size = hdr.max_pages / (sizeof(hdr.eof_hint) * CHAR_BIT);
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range_start = part_size * search_limit;
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range_end = range_start + part_size;
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if(range_end > hdr.max_pages) {
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range_end = hdr.max_pages;
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}
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/*
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* Move from the end of the file towards the beginning and look for
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* Move from the end of the range towards the beginning and look for
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* a byte that has been modified.
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*
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* An important implication of this is that if the last written bytes
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* are zeroes, then these are skipped from the calculation.
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*/
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for(page = first_page + hdr.max_pages - 1; page >= first_page; page--) {
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for(page = first_page + range_end; page >= first_page + range_start; page--) {
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watchdog_periodic();
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COFFEE_READ(buf, sizeof (buf), page * COFFEE_PAGE_SIZE);
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COFFEE_READ(buf, sizeof(buf), page * COFFEE_PAGE_SIZE);
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for(i = COFFEE_PAGE_SIZE - 1; i >= 0; i--) {
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if(buf[i] != 0) {
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if(page == first_page) {
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return i < sizeof (hdr) ? 0 : 1 + i - sizeof (hdr);
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return i < sizeof(hdr) ? 0 : 1 + i - sizeof(hdr);
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} else {
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return 1 + i + (page - first_page) * COFFEE_PAGE_SIZE - sizeof (hdr);
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return 1 + i + (page - first_page) * COFFEE_PAGE_SIZE - sizeof(hdr);
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}
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}
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}
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@ -329,6 +367,8 @@ find_contiguous_pages(unsigned wanted)
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}
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/* Jump to the next sector. */
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page = (page + COFFEE_PAGES_PER_SECTOR) & ~(COFFEE_PAGES_PER_SECTOR - 1);
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} else if(COFFEE_PAGE_ISOLATED(hdr)) {
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++page;
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} else {
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start = -1;
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page += hdr.max_pages;
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@ -361,21 +401,17 @@ cfs_garbage_collect(void)
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COFFEE_ERASE(sector);
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PRINTF("Coffee: Erased sector %d!\n", sector);
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++sectors_in_row;
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} else {
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if(sectors_in_row > longest_row) {
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longest_row = sectors_in_row;
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}
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} else {
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sectors_in_row = 0;
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}
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}
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if(sectors_in_row > longest_row) {
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longest_row = sectors_in_row;
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}
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watchdog_start();
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return longest_row * (COFFEE_PAGES_PER_SECTOR);
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return longest_row * COFFEE_PAGES_PER_SECTOR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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@ -449,7 +485,7 @@ read_log_page(struct file_header *hdr, int16_t last_entry, struct log_param *lp)
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uint16_t processed;
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uint16_t current_batch_size;
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base = ABS_OFFSET(hdr->log_page, sizeof (indices[0]) * search_entries);
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base = ABS_OFFSET(hdr->log_page, sizeof(indices[0]) * search_entries);
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processed = 0;
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match_index = -1;
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while(processed < search_entries && match_index < 0) {
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@ -459,8 +495,8 @@ read_log_page(struct file_header *hdr, int16_t last_entry, struct log_param *lp)
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current_batch_size = entry_count;
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}
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base -= current_batch_size * sizeof (indices[0]);
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COFFEE_READ(&indices, sizeof (indices[0]) * current_batch_size, base);
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base -= current_batch_size * sizeof(indices[0]);
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COFFEE_READ(&indices, sizeof(indices[0]) * current_batch_size, base);
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for(i = current_batch_size - 1; i >= 0; i--) {
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if(indices[i] - 1 == page) {
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@ -476,7 +512,7 @@ read_log_page(struct file_header *hdr, int16_t last_entry, struct log_param *lp)
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}
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base = hdr->log_page * COFFEE_PAGE_SIZE;
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base += sizeof (struct file_header) + log_entries * sizeof (page);
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base += sizeof(struct file_header) + log_entries * sizeof(page);
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base += (unsigned long)match_index * log_entry_size;
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base += lp->offset;
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@ -493,11 +529,11 @@ create_log_name(unsigned char *new, int max_size, unsigned char *old)
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int len;
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len = strlen(old);
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if(len > max_size - sizeof (suffix)) {
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len = max_size - sizeof (suffix);
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if(len > max_size - sizeof(suffix)) {
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len = max_size - sizeof(suffix);
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}
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memcpy(new, old, len);
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memcpy(&new[len], suffix, sizeof (suffix));
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memcpy(&new[len], suffix, sizeof(suffix));
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return new;
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}
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@ -506,7 +542,7 @@ static int16_t
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create_log(int16_t file_page, struct file_header *hdr)
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{
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int16_t log_page;
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unsigned char log_name[sizeof (hdr->name)];
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unsigned char log_name[sizeof(hdr->name)];
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uint16_t log_entry_size, log_entries;
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uint32_t size;
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@ -515,9 +551,9 @@ create_log(int16_t file_page, struct file_header *hdr)
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log_entries = hdr->log_entries == 0 ?
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COFFEE_LOG_SIZE / log_entry_size : hdr->log_entries;
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size = log_entries * sizeof (uint16_t);
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size = log_entries * sizeof(uint16_t);
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size += log_entries * log_entry_size;
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log_page = cfs_coffee_reserve(create_log_name(log_name, sizeof (log_name), hdr->name),
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log_page = cfs_coffee_reserve(create_log_name(log_name, sizeof(log_name), hdr->name),
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size);
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if(log_page < 0) {
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return -1;
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@ -556,7 +592,7 @@ flush_log(uint16_t file_page)
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offset = 0;
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do {
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watchdog_periodic();
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n = cfs_read(fd, buf, sizeof (buf));
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n = cfs_read(fd, buf, sizeof(buf));
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if(n < 0) {
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remove_by_page(new_file_page, 0, 0);
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cfs_close(fd);
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@ -637,8 +673,8 @@ write_log_page(struct file_desc *fdp, struct log_param *lp)
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for(processed = 0; processed < log_entries;) {
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current_batch_size = log_entries - processed >= entry_count ?
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entry_count : log_entries - processed;
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COFFEE_READ(&indices, current_batch_size * sizeof (indices[0]),
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ABS_OFFSET(log_page, processed * sizeof (indices[0])));
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COFFEE_READ(&indices, current_batch_size * sizeof(indices[0]),
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ABS_OFFSET(log_page, processed * sizeof(indices[0])));
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for(i = 0; i < current_batch_size && indices[i] != 0; i++);
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log_entry = i;
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if(log_entry < current_batch_size) {
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@ -653,7 +689,7 @@ write_log_page(struct file_desc *fdp, struct log_param *lp)
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if(log_entry >= log_entries) {
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/* The log is full. The new file should be written out. */
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PRINTF("Coffee: The log for file %s is full\n", hdr.name);
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PRINTF("Coffee: Flushing the log for file %s\n", hdr.name);
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fdp->next_log_entry = 0;
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return flush_log(fdp->file_page);
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}
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@ -678,21 +714,21 @@ write_log_page(struct file_desc *fdp, struct log_param *lp)
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if(lp->offset > 0 &&
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read_log_page(&hdr, fdp->next_log_entry > 0 ? fdp->next_log_entry - 1 : -1, &lp_out) < 0) {
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COFFEE_READ(copy_buf, sizeof (copy_buf),
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COFFEE_READ(copy_buf, sizeof(copy_buf),
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ABS_OFFSET(fdp->file_page, page * log_entry_size));
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}
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memcpy((char *) ©_buf + lp->offset, lp->buf, lp->size);
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base = (unsigned long)log_page * COFFEE_PAGE_SIZE;
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base += sizeof (hdr);
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base += log_entries * sizeof (page);
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base += sizeof(hdr);
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base += log_entries * sizeof(page);
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base += (unsigned long)log_entry * log_entry_size;
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COFFEE_WRITE(copy_buf, sizeof (copy_buf), base);
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COFFEE_WRITE(copy_buf, sizeof(copy_buf), base);
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++page;
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COFFEE_WRITE(&page, sizeof (page),
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ABS_OFFSET(log_page, log_entry * sizeof (page)));
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COFFEE_WRITE(&page, sizeof(page),
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ABS_OFFSET(log_page, log_entry * sizeof(page)));
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fdp->next_log_entry = log_entry + 1;
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}
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@ -732,7 +768,8 @@ cfs_open(const char *name, int flags)
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if((page = cfs_coffee_reserve(name, COFFEE_DYN_SIZE)) < 0) {
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return -1;
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}
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coffee_fd_set[fd].max_pages = COFFEE_DYN_SIZE / COFFEE_PAGE_SIZE;
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coffee_fd_set[fd].max_pages = (COFFEE_DYN_SIZE + sizeof(hdr) +
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COFFEE_PAGE_SIZE - 1) / COFFEE_PAGE_SIZE;
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} else {
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READ_HEADER(&hdr, page);
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coffee_fd_set[fd].max_pages = hdr.max_pages;
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@ -750,7 +787,25 @@ cfs_open(const char *name, int flags)
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void
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cfs_close(int fd)
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{
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struct file_header hdr;
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uint16_t current_page, i;
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int part_size;
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uint8_t eof_hint;
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if(FD_VALID(fd)) {
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READ_HEADER(&hdr, coffee_fd_set[fd].file_page);
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current_page = (coffee_fd_set[fd].end + COFFEE_PAGE_SIZE - 1) / COFFEE_PAGE_SIZE;
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part_size = hdr.max_pages / (sizeof(hdr.eof_hint) * CHAR_BIT);
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for(i = eof_hint = 0; i < sizeof(eof_hint) * CHAR_BIT; i++) {
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eof_hint |= (current_page > (i + 1) * part_size) << i;
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}
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if(eof_hint > hdr.eof_hint) {
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hdr.eof_hint |= eof_hint;
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WRITE_HEADER(&hdr, coffee_fd_set[fd].file_page);
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}
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coffee_fd_set[fd].flags = COFFEE_FD_FREE;
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}
|
||||
}
|
||||
|
|
@ -765,7 +820,7 @@ cfs_seek(int fd, unsigned offset)
|
|||
}
|
||||
|
||||
READ_HEADER(&hdr, coffee_fd_set[fd].file_page);
|
||||
if(sizeof (hdr) + offset >= hdr.max_pages * COFFEE_PAGE_SIZE) {
|
||||
if(sizeof(hdr) + offset >= hdr.max_pages * COFFEE_PAGE_SIZE) {
|
||||
/* XXX: Try to extend the file here? */
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -857,10 +912,10 @@ cfs_write(int fd, const void *buf, unsigned size)
|
|||
|
||||
fdp = &coffee_fd_set[fd];
|
||||
|
||||
if(size + fdp->offset + sizeof (struct file_header) >
|
||||
if(size + fdp->offset + sizeof(struct file_header) >
|
||||
fdp->max_pages * COFFEE_PAGE_SIZE) {
|
||||
size = fdp->max_pages * COFFEE_PAGE_SIZE -
|
||||
fdp->offset - sizeof (struct file_header);
|
||||
fdp->offset - sizeof(struct file_header);
|
||||
}
|
||||
|
||||
if(fdp->offset < fdp->end) {
|
||||
|
|
@ -918,16 +973,19 @@ cfs_readdir(struct cfs_dir *dir, struct cfs_dirent *entry)
|
|||
for(page = *(uint16_t *)dir->dummy_space; page < COFFEE_PAGE_COUNT;) {
|
||||
watchdog_periodic();
|
||||
READ_HEADER(&hdr, page);
|
||||
if(COFFEE_PAGE_ACTIVE(hdr) && !COFFEE_PAGE_LOG(hdr)) {
|
||||
memcpy(entry->name, hdr.name, sizeof (entry->name));
|
||||
entry->name[sizeof (entry->name) - 1] = '\0';
|
||||
entry->size = find_offset_in_file(page);
|
||||
page += hdr.max_pages;
|
||||
*(uint16_t *)dir->dummy_space = page;
|
||||
return 0;
|
||||
} else if (COFFEE_PAGE_FREE(hdr)) {
|
||||
if(COFFEE_PAGE_FREE(hdr)) {
|
||||
page = (page + COFFEE_PAGES_PER_SECTOR) & ~(COFFEE_PAGES_PER_SECTOR - 1);
|
||||
} else if(COFFEE_PAGE_ISOLATED(hdr)) {
|
||||
++page;
|
||||
} else {
|
||||
if(COFFEE_PAGE_ACTIVE(hdr) && !COFFEE_PAGE_LOG(hdr)) {
|
||||
memcpy(entry->name, hdr.name, sizeof(entry->name));
|
||||
entry->name[sizeof(entry->name) - 1] = '\0';
|
||||
entry->size = find_offset_in_file(page);
|
||||
*(uint16_t *)dir->dummy_space = page;
|
||||
page += hdr.max_pages;
|
||||
return 0;
|
||||
}
|
||||
page += hdr.max_pages;
|
||||
}
|
||||
}
|
||||
|
|
@ -948,7 +1006,7 @@ cfs_coffee_reserve(const char *name, uint32_t size)
|
|||
unsigned need_pages;
|
||||
int page;
|
||||
|
||||
need_pages = (size + sizeof (hdr) + COFFEE_PAGE_SIZE - 1) / COFFEE_PAGE_SIZE;
|
||||
need_pages = (size + sizeof(hdr) + COFFEE_PAGE_SIZE - 1) / COFFEE_PAGE_SIZE;
|
||||
|
||||
watchdog_stop();
|
||||
page = find_contiguous_pages(need_pages);
|
||||
|
|
@ -963,8 +1021,8 @@ cfs_coffee_reserve(const char *name, uint32_t size)
|
|||
}
|
||||
}
|
||||
|
||||
memcpy(hdr.name, name, sizeof (hdr.name));
|
||||
hdr.name[sizeof (hdr.name) - 1] = '\0';
|
||||
memcpy(hdr.name, name, sizeof(hdr.name));
|
||||
hdr.name[sizeof(hdr.name) - 1] = '\0';
|
||||
hdr.max_pages = need_pages;
|
||||
hdr.flags = COFFEE_FLAG_ALLOCATED | COFFEE_FLAG_VALID;
|
||||
hdr.log_page = 0;
|
||||
|
|
@ -1014,14 +1072,14 @@ cfs_coffee_format(void)
|
|||
|
||||
nsectors = COFFEE_SIZE / COFFEE_SECTOR_SIZE;
|
||||
/* Reject format requests when the configuration is incorrect. */
|
||||
if (nsectors < 1 || (COFFEE_START & (COFFEE_SECTOR_SIZE - 1))) {
|
||||
if(nsectors < 1 || (COFFEE_START & (COFFEE_SECTOR_SIZE - 1))) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
PRINTF("Coffee: Formatting %d sectors", nsectors);
|
||||
|
||||
watchdog_stop();
|
||||
for (i = 0; i < nsectors; i++) {
|
||||
for(i = 0; i < nsectors; i++) {
|
||||
COFFEE_ERASE(i);
|
||||
PRINTF(".");
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue