break out eof update functionality since its now needed at more than one
place.
This commit is contained in:
parent
8bae6890a8
commit
c4a5010c46
1 changed files with 59 additions and 51 deletions
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@ -84,15 +84,15 @@
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#define COFFEE_FLAG_LOG 0x10 /* Log file. */
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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_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_FILE_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_FILE_FREE(hdr) !COFFEE_FILE_ALLOCATED(hdr)
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#define COFFEE_PAGE_LOG(hdr) ((hdr).flags & COFFEE_FLAG_LOG)
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#define COFFEE_FILE_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_FILE_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_FILE_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_FILE_OBSOLETE(hdr) ((hdr).flags & COFFEE_FLAG_OBSOLETE)
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#define COFFEE_PAGE_ACTIVE(hdr) (COFFEE_PAGE_ALLOCATED(hdr) && \
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#define COFFEE_FILE_ACTIVE(hdr) (COFFEE_FILE_ALLOCATED(hdr) && \
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!COFFEE_PAGE_OBSOLETE(hdr) && \
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!COFFEE_FILE_OBSOLETE(hdr) && \
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!COFFEE_PAGE_ISOLATED(hdr))
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!COFFEE_FILE_ISOLATED(hdr))
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#define COFFEE_PAGE_COUNT (COFFEE_SIZE / COFFEE_PAGE_SIZE)
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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_PAGES_PER_SECTOR (COFFEE_SECTOR_SIZE / COFFEE_PAGE_SIZE)
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@ -102,7 +102,7 @@ struct file_desc {
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coffee_offset_t end;
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coffee_offset_t end;
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coffee_page_t file_page;
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coffee_page_t file_page;
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coffee_page_t max_pages;
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coffee_page_t max_pages;
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uint16_t next_log_record;
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int16_t next_log_record;
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uint8_t flags;
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uint8_t flags;
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};
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};
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@ -200,17 +200,17 @@ get_sector_status(uint16_t sector, coffee_page_t *active,
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while(offset < end) {
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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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last_pages_are_active = 0;
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last_pages_are_active = 0;
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if(COFFEE_PAGE_ACTIVE(hdr)) {
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if(COFFEE_FILE_ACTIVE(hdr)) {
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last_pages_are_active = 1;
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last_pages_are_active = 1;
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jump = hdr.max_pages;
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jump = hdr.max_pages;
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*active += jump;
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*active += jump;
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} else if(COFFEE_PAGE_ISOLATED(hdr)) {
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} else if(COFFEE_FILE_ISOLATED(hdr)) {
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jump = 1;
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jump = 1;
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*obsolete++;
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*obsolete++;
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} else if(COFFEE_PAGE_OBSOLETE(hdr)) {
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} else if(COFFEE_FILE_OBSOLETE(hdr)) {
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jump = hdr.max_pages;
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jump = hdr.max_pages;
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*obsolete += jump;
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*obsolete += jump;
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} else if(COFFEE_PAGE_FREE(hdr)) {
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} else if(COFFEE_FILE_FREE(hdr)) {
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*free = (end - offset) / COFFEE_PAGE_SIZE;
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*free = (end - offset) / COFFEE_PAGE_SIZE;
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break;
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break;
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}
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}
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@ -262,7 +262,7 @@ dir_cache_find(const char *name)
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for(i = 0; i < COFFEE_DIR_CACHE_ENTRIES; i++) {
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for(i = 0; i < COFFEE_DIR_CACHE_ENTRIES; i++) {
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if(*name == dir_cache[i].filename_start) {
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if(*name == dir_cache[i].filename_start) {
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read_header(&hdr, dir_cache[i].page);
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read_header(&hdr, dir_cache[i].page);
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if(!COFFEE_PAGE_ACTIVE(hdr)) {
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if(!COFFEE_FILE_ACTIVE(hdr)) {
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dir_cache[i].filename_start = '\0';
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dir_cache[i].filename_start = '\0';
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} else if(strcmp(hdr.name, name) == 0) {
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} else if(strcmp(hdr.name, name) == 0) {
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return dir_cache[i].page;
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return dir_cache[i].page;
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@ -287,7 +287,7 @@ find_file(const char *name)
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page = 0;
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page = 0;
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do {
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do {
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read_header(&hdr, page);
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read_header(&hdr, page);
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if(COFFEE_PAGE_ACTIVE(hdr)) {
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if(COFFEE_FILE_ACTIVE(hdr)) {
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if(dir_cache_find(name) == -1) {
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if(dir_cache_find(name) == -1) {
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dir_cache_add(name[0], page);
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dir_cache_add(name[0], page);
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}
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}
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@ -295,9 +295,9 @@ find_file(const char *name)
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return page;
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return page;
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}
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}
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page += hdr.max_pages;
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page += hdr.max_pages;
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} else if(COFFEE_PAGE_ISOLATED(hdr)) {
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} else if(COFFEE_FILE_ISOLATED(hdr)) {
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++page;
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++page;
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} else if(COFFEE_PAGE_OBSOLETE(hdr)) {
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} else if(COFFEE_FILE_OBSOLETE(hdr)) {
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page += hdr.max_pages;
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page += hdr.max_pages;
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} else {
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} else {
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/* It follows from the properties of the page allocation algorithm
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/* It follows from the properties of the page allocation algorithm
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@ -311,6 +311,30 @@ find_file(const char *name)
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return -1;
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return -1;
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}
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}
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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static void
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update_eof_hint(coffee_page_t file_page, coffee_offset_t end)
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{
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struct file_header hdr;
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coffee_page_t current_page;
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int part_size, i;
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uint8_t eof_hint;
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read_header(&hdr, file_page);
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current_page = (end + sizeof(hdr)) / COFFEE_PAGE_SIZE;
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part_size = hdr.max_pages / (sizeof(hdr.eof_hint) * CHAR_BIT);
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if(part_size == 0) {
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part_size = 1;
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}
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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, file_page);
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}
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}
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/*---------------------------------------------------------------------------*/
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static coffee_offset_t
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static coffee_offset_t
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find_offset_in_file(int first_page)
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find_offset_in_file(int first_page)
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{
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{
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@ -373,7 +397,7 @@ find_contiguous_pages(unsigned wanted)
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start = -1;
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start = -1;
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for(page = 0; page < COFFEE_PAGE_COUNT;) {
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for(page = 0; page < COFFEE_PAGE_COUNT;) {
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read_header(&hdr, page);
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read_header(&hdr, page);
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if(COFFEE_PAGE_FREE(hdr)) {
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if(COFFEE_FILE_FREE(hdr)) {
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if(start == -1) {
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if(start == -1) {
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start = page;
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start = page;
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} else {
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} else {
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@ -383,7 +407,7 @@ find_contiguous_pages(unsigned wanted)
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}
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}
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/* Jump to the next sector. */
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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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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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} else if(COFFEE_FILE_ISOLATED(hdr)) {
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++page;
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++page;
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} else {
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} else {
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start = -1;
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start = -1;
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@ -434,14 +458,14 @@ remove_by_page(coffee_page_t page, int remove_log, int close_fds)
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}
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}
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read_header(&hdr, page);
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read_header(&hdr, page);
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if(!COFFEE_PAGE_ACTIVE(hdr)) {
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if(!COFFEE_FILE_ACTIVE(hdr)) {
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return -1;
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return -1;
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}
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}
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dir_cache_del(page);
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dir_cache_del(page);
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hdr.flags |= COFFEE_FLAG_OBSOLETE;
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hdr.flags |= COFFEE_FLAG_OBSOLETE;
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write_header(&hdr, page);
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write_header(&hdr, page);
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if(remove_log && COFFEE_PAGE_MODIFIED(hdr)) {
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if(remove_log && COFFEE_FILE_MODIFIED(hdr)) {
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log_page = hdr.log_page;
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log_page = hdr.log_page;
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dir_cache_del(log_page);
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dir_cache_del(log_page);
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read_header(&hdr, log_page);
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read_header(&hdr, log_page);
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processed += batch_size;
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processed += batch_size;
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}
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}
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}
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}
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return match_index;
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return match_index;
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}
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}
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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@ -696,7 +721,7 @@ merge_log(coffee_page_t file_page, int extend)
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} while(n != 0);
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} while(n != 0);
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if(remove_by_page(file_page, 1, 0) < 0) {
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if(remove_by_page(file_page, 1, 0) < 0) {
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remove_by_page(new_file_page, 0, 0);
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remove_by_page(new_file_page, 0, 0);
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cfs_close(fd);
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cfs_close(fd);
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return -1;
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return -1;
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}
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}
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@ -714,7 +739,7 @@ merge_log(coffee_page_t file_page, int extend)
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coffee_fd_set[n].file_page = new_file_page;
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coffee_fd_set[n].file_page = new_file_page;
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coffee_fd_set[n].max_pages = max_pages;
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coffee_fd_set[n].max_pages = max_pages;
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coffee_fd_set[n].flags &= ~COFFEE_FD_MODIFIED;
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coffee_fd_set[n].flags &= ~COFFEE_FD_MODIFIED;
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coffee_fd_set[n].next_log_record = 0;
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coffee_fd_set[n].next_log_record = -1;
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}
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}
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}
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}
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region = modify_log_buffer(log_record_size, &lp->offset, &lp->size);
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region = modify_log_buffer(log_record_size, &lp->offset, &lp->size);
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log_page = 0;
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log_page = 0;
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if(COFFEE_PAGE_MODIFIED(hdr)) {
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if(COFFEE_FILE_MODIFIED(hdr)) {
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/* A log structure has already been created. */
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/* A log structure has already been created. */
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log_page = hdr.log_page;
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log_page = hdr.log_page;
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log_record = find_next_record(fdp, log_page, log_records);
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log_record = find_next_record(fdp, log_page, log_records);
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if(log_record >= log_records) {
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if(log_record >= log_records) {
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/* The log is full; merge the log. */
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/* The log is full; merge the log. */
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PRINTF("Coffee: Merging the file %s with its log\n", hdr.name);
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PRINTF("Coffee: Merging the file %s with its log\n", hdr.name);
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update_eof_hint(fdp->file_page, fdp->end);
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return merge_log(fdp->file_page, 0);
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return merge_log(fdp->file_page, 0);
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}
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}
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} else {
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} else {
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@ -868,7 +894,7 @@ cfs_open(const char *name, int flags)
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COFFEE_PAGE_SIZE - 1) / COFFEE_PAGE_SIZE;
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COFFEE_PAGE_SIZE - 1) / COFFEE_PAGE_SIZE;
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} else {
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} else {
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read_header(&hdr, page);
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read_header(&hdr, page);
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if(COFFEE_PAGE_MODIFIED(hdr)) {
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if(COFFEE_FILE_MODIFIED(hdr)) {
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fdp->flags = COFFEE_FD_MODIFIED;
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fdp->flags = COFFEE_FD_MODIFIED;
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} else
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} else
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fdp->max_pages = hdr.max_pages;
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fdp->max_pages = hdr.max_pages;
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@ -886,27 +912,8 @@ cfs_open(const char *name, int flags)
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void
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void
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cfs_close(int fd)
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cfs_close(int fd)
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{
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{
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struct file_header hdr;
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coffee_page_t current_page;
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int part_size, i;
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uint8_t eof_hint;
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if(FD_VALID(fd)) {
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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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update_eof_hint(coffee_fd_set[fd].file_page, coffee_fd_set[fd].end);
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current_page = (coffee_fd_set[fd].end + sizeof(hdr)) / COFFEE_PAGE_SIZE;
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part_size = hdr.max_pages / (sizeof(hdr.eof_hint) * CHAR_BIT);
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if(part_size == 0) {
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part_size = 1;
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}
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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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coffee_fd_set[fd].flags = COFFEE_FD_FREE;
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}
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}
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}
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}
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@ -1020,6 +1027,7 @@ cfs_write(int fd, const void *buf, unsigned size)
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/* Attempt to extend the file if we try to write past the end. */
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/* Attempt to extend the file if we try to write past the end. */
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while(size + fdp->offset + sizeof(struct file_header) >
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while(size + fdp->offset + sizeof(struct file_header) >
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fdp->max_pages * COFFEE_PAGE_SIZE) {
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fdp->max_pages * COFFEE_PAGE_SIZE) {
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update_eof_hint(fdp->file_page, fdp->end);
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if(merge_log(fdp->file_page, 1) < 0) {
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if(merge_log(fdp->file_page, 1) < 0) {
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return -1;
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return -1;
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}
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}
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@ -1086,11 +1094,11 @@ cfs_readdir(struct cfs_dir *dir, struct cfs_dirent *record)
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for(page = *(coffee_page_t *)dir->dummy_space; page < COFFEE_PAGE_COUNT;) {
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for(page = *(coffee_page_t *)dir->dummy_space; page < COFFEE_PAGE_COUNT;) {
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watchdog_periodic();
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watchdog_periodic();
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read_header(&hdr, page);
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read_header(&hdr, page);
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if(COFFEE_PAGE_FREE(hdr)) {
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if(COFFEE_FILE_FREE(hdr)) {
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page = (page + COFFEE_PAGES_PER_SECTOR) & ~(COFFEE_PAGES_PER_SECTOR - 1);
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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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} else if(COFFEE_FILE_ISOLATED(hdr)) {
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++page;
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++page;
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} else if(COFFEE_PAGE_ACTIVE(hdr) && !COFFEE_PAGE_LOG(hdr)) {
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} else if(COFFEE_FILE_ACTIVE(hdr) && !COFFEE_FILE_LOG(hdr)) {
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memcpy(record->name, hdr.name, sizeof(record->name));
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memcpy(record->name, hdr.name, sizeof(record->name));
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record->name[sizeof(record->name) - 1] = '\0';
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record->name[sizeof(record->name) - 1] = '\0';
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record->size = find_offset_in_file(page);
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record->size = find_offset_in_file(page);
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@ -1135,7 +1143,7 @@ cfs_coffee_configure_log(const char *file, unsigned log_size,
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}
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}
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read_header(&hdr, page);
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read_header(&hdr, page);
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if(COFFEE_PAGE_MODIFIED(hdr)) {
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if(COFFEE_FILE_MODIFIED(hdr)) {
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/* Too late to customize the log. */
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/* Too late to customize the log. */
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return -1;
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return -1;
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}
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}
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