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break out eof update functionality since its now needed at more than one

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place.
This commit is contained in:
nvt-se 2008-11-18 23:10:30 +00:00
parent 8bae6890a8
commit c4a5010c46
1 changed files with 59 additions and 51 deletions
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110
core/cfs/cfs-coffee.c
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@ -84,15 +84,15 @@
#define COFFEE_FLAG_LOG 0x10 /* Log file. */
#define COFFEE_FLAG_ISOLATED 0x20 /* Isolated page. */
#define COFFEE_PAGE_ALLOCATED(hdr) ((hdr).flags & COFFEE_FLAG_ALLOCATED)
#define COFFEE_PAGE_FREE(hdr) !COFFEE_PAGE_ALLOCATED(hdr)
#define COFFEE_PAGE_LOG(hdr) ((hdr).flags & COFFEE_FLAG_LOG)
#define COFFEE_PAGE_MODIFIED(hdr) ((hdr).flags & COFFEE_FLAG_MODIFIED)
#define COFFEE_PAGE_ISOLATED(hdr) ((hdr).flags & COFFEE_FLAG_ISOLATED)
#define COFFEE_PAGE_OBSOLETE(hdr) ((hdr).flags & COFFEE_FLAG_OBSOLETE)
#define COFFEE_PAGE_ACTIVE(hdr) (COFFEE_PAGE_ALLOCATED(hdr) && \
!COFFEE_PAGE_OBSOLETE(hdr) && \
!COFFEE_PAGE_ISOLATED(hdr))
#define COFFEE_FILE_ALLOCATED(hdr) ((hdr).flags & COFFEE_FLAG_ALLOCATED)
#define COFFEE_FILE_FREE(hdr) !COFFEE_FILE_ALLOCATED(hdr)
#define COFFEE_FILE_LOG(hdr) ((hdr).flags & COFFEE_FLAG_LOG)
#define COFFEE_FILE_MODIFIED(hdr) ((hdr).flags & COFFEE_FLAG_MODIFIED)
#define COFFEE_FILE_ISOLATED(hdr) ((hdr).flags & COFFEE_FLAG_ISOLATED)
#define COFFEE_FILE_OBSOLETE(hdr) ((hdr).flags & COFFEE_FLAG_OBSOLETE)
#define COFFEE_FILE_ACTIVE(hdr) (COFFEE_FILE_ALLOCATED(hdr) && \
!COFFEE_FILE_OBSOLETE(hdr) && \
!COFFEE_FILE_ISOLATED(hdr))
#define COFFEE_PAGE_COUNT (COFFEE_SIZE / COFFEE_PAGE_SIZE)
#define COFFEE_PAGES_PER_SECTOR (COFFEE_SECTOR_SIZE / COFFEE_PAGE_SIZE)
@ -102,7 +102,7 @@ struct file_desc {
coffee_offset_t end;
coffee_page_t file_page;
coffee_page_t max_pages;
uint16_t next_log_record;
int16_t next_log_record;
uint8_t flags;
};
@ -200,17 +200,17 @@ get_sector_status(uint16_t sector, coffee_page_t *active,
while(offset < end) {
COFFEE_READ(&hdr, sizeof(hdr), offset);
last_pages_are_active = 0;
if(COFFEE_PAGE_ACTIVE(hdr)) {
if(COFFEE_FILE_ACTIVE(hdr)) {
last_pages_are_active = 1;
jump = hdr.max_pages;
*active += jump;
} else if(COFFEE_PAGE_ISOLATED(hdr)) {
} else if(COFFEE_FILE_ISOLATED(hdr)) {
jump = 1;
*obsolete++;
} else if(COFFEE_PAGE_OBSOLETE(hdr)) {
} else if(COFFEE_FILE_OBSOLETE(hdr)) {
jump = hdr.max_pages;
*obsolete += jump;
} else if(COFFEE_PAGE_FREE(hdr)) {
} else if(COFFEE_FILE_FREE(hdr)) {
*free = (end - offset) / COFFEE_PAGE_SIZE;
break;
}
@ -262,7 +262,7 @@ dir_cache_find(const char *name)
for(i = 0; i < COFFEE_DIR_CACHE_ENTRIES; i++) {
if(*name == dir_cache[i].filename_start) {
read_header(&hdr, dir_cache[i].page);
if(!COFFEE_PAGE_ACTIVE(hdr)) {
if(!COFFEE_FILE_ACTIVE(hdr)) {
dir_cache[i].filename_start = '\0';
} else if(strcmp(hdr.name, name) == 0) {
return dir_cache[i].page;
@ -287,7 +287,7 @@ find_file(const char *name)
page = 0;
do {
read_header(&hdr, page);
if(COFFEE_PAGE_ACTIVE(hdr)) {
if(COFFEE_FILE_ACTIVE(hdr)) {
if(dir_cache_find(name) == -1) {
dir_cache_add(name[0], page);
}
@ -295,9 +295,9 @@ find_file(const char *name)
return page;
}
page += hdr.max_pages;
} else if(COFFEE_PAGE_ISOLATED(hdr)) {
} else if(COFFEE_FILE_ISOLATED(hdr)) {
++page;
} else if(COFFEE_PAGE_OBSOLETE(hdr)) {
} else if(COFFEE_FILE_OBSOLETE(hdr)) {
page += hdr.max_pages;
} else {
/* It follows from the properties of the page allocation algorithm
@ -311,6 +311,30 @@ find_file(const char *name)
return -1;
}
/*---------------------------------------------------------------------------*/
static void
update_eof_hint(coffee_page_t file_page, coffee_offset_t end)
{
struct file_header hdr;
coffee_page_t current_page;
int part_size, i;
uint8_t eof_hint;
read_header(&hdr, file_page);
current_page = (end + sizeof(hdr)) / COFFEE_PAGE_SIZE;
part_size = hdr.max_pages / (sizeof(hdr.eof_hint) * CHAR_BIT);
if(part_size == 0) {
part_size = 1;
}
for(i = eof_hint = 0; i < sizeof(eof_hint) * CHAR_BIT; i++) {
eof_hint |= (current_page >= (i + 1) * part_size) << i;
}
if(eof_hint > hdr.eof_hint) {
hdr.eof_hint |= eof_hint;
write_header(&hdr, file_page);
}
}
/*---------------------------------------------------------------------------*/
static coffee_offset_t
find_offset_in_file(int first_page)
{
@ -373,7 +397,7 @@ find_contiguous_pages(unsigned wanted)
start = -1;
for(page = 0; page < COFFEE_PAGE_COUNT;) {
read_header(&hdr, page);
if(COFFEE_PAGE_FREE(hdr)) {
if(COFFEE_FILE_FREE(hdr)) {
if(start == -1) {
start = page;
} else {
@ -383,7 +407,7 @@ find_contiguous_pages(unsigned wanted)
}
/* Jump to the next sector. */
page = (page + COFFEE_PAGES_PER_SECTOR) & ~(COFFEE_PAGES_PER_SECTOR - 1);
} else if(COFFEE_PAGE_ISOLATED(hdr)) {
} else if(COFFEE_FILE_ISOLATED(hdr)) {
++page;
} else {
start = -1;
@ -434,14 +458,14 @@ remove_by_page(coffee_page_t page, int remove_log, int close_fds)
}
read_header(&hdr, page);
if(!COFFEE_PAGE_ACTIVE(hdr)) {
if(!COFFEE_FILE_ACTIVE(hdr)) {
return -1;
}
dir_cache_del(page);
hdr.flags |= COFFEE_FLAG_OBSOLETE;
write_header(&hdr, page);
if(remove_log && COFFEE_PAGE_MODIFIED(hdr)) {
if(remove_log && COFFEE_FILE_MODIFIED(hdr)) {
log_page = hdr.log_page;
dir_cache_del(log_page);
read_header(&hdr, log_page);
@ -567,6 +591,7 @@ get_record_index(coffee_page_t log_page, uint16_t search_records,
processed += batch_size;
}
}
return match_index;
}
/*---------------------------------------------------------------------------*/
@ -694,9 +719,9 @@ merge_log(coffee_page_t file_page, int extend)
offset += n;
}
} while(n != 0);
if(remove_by_page(file_page, 1, 0) < 0) {
remove_by_page(new_file_page, 0, 0);
remove_by_page(new_file_page, 0, 0);
cfs_close(fd);
return -1;
}
@ -714,7 +739,7 @@ merge_log(coffee_page_t file_page, int extend)
coffee_fd_set[n].file_page = new_file_page;
coffee_fd_set[n].max_pages = max_pages;
coffee_fd_set[n].flags &= ~COFFEE_FD_MODIFIED;
coffee_fd_set[n].next_log_record = 0;
coffee_fd_set[n].next_log_record = -1;
}
}
@ -777,13 +802,14 @@ write_log_page(struct file_desc *fdp, struct log_param *lp)
region = modify_log_buffer(log_record_size, &lp->offset, &lp->size);
log_page = 0;
if(COFFEE_PAGE_MODIFIED(hdr)) {
if(COFFEE_FILE_MODIFIED(hdr)) {
/* A log structure has already been created. */
log_page = hdr.log_page;
log_record = find_next_record(fdp, log_page, log_records);
if(log_record >= log_records) {
/* The log is full; merge the log. */
PRINTF("Coffee: Merging the file %s with its log\n", hdr.name);
update_eof_hint(fdp->file_page, fdp->end);
return merge_log(fdp->file_page, 0);
}
} else {
@ -868,7 +894,7 @@ cfs_open(const char *name, int flags)
COFFEE_PAGE_SIZE - 1) / COFFEE_PAGE_SIZE;
} else {
read_header(&hdr, page);
if(COFFEE_PAGE_MODIFIED(hdr)) {
if(COFFEE_FILE_MODIFIED(hdr)) {
fdp->flags = COFFEE_FD_MODIFIED;
} else
fdp->max_pages = hdr.max_pages;
@ -886,27 +912,8 @@ cfs_open(const char *name, int flags)
void
cfs_close(int fd)
{
struct file_header hdr;
coffee_page_t current_page;
int part_size, i;
uint8_t eof_hint;
if(FD_VALID(fd)) {
read_header(&hdr, coffee_fd_set[fd].file_page);
current_page = (coffee_fd_set[fd].end + sizeof(hdr)) / COFFEE_PAGE_SIZE;
part_size = hdr.max_pages / (sizeof(hdr.eof_hint) * CHAR_BIT);
if(part_size == 0) {
part_size = 1;
}
for(i = eof_hint = 0; i < sizeof(eof_hint) * CHAR_BIT; i++) {
eof_hint |= (current_page >= (i + 1) * part_size) << i;
}
if(eof_hint > hdr.eof_hint) {
hdr.eof_hint |= eof_hint;
write_header(&hdr, coffee_fd_set[fd].file_page);
}
update_eof_hint(coffee_fd_set[fd].file_page, coffee_fd_set[fd].end);
coffee_fd_set[fd].flags = COFFEE_FD_FREE;
}
}
@ -1020,6 +1027,7 @@ cfs_write(int fd, const void *buf, unsigned size)
/* Attempt to extend the file if we try to write past the end. */
while(size + fdp->offset + sizeof(struct file_header) >
fdp->max_pages * COFFEE_PAGE_SIZE) {
update_eof_hint(fdp->file_page, fdp->end);
if(merge_log(fdp->file_page, 1) < 0) {
return -1;
}
@ -1086,11 +1094,11 @@ cfs_readdir(struct cfs_dir *dir, struct cfs_dirent *record)
for(page = *(coffee_page_t *)dir->dummy_space; page < COFFEE_PAGE_COUNT;) {
watchdog_periodic();
read_header(&hdr, page);
if(COFFEE_PAGE_FREE(hdr)) {
if(COFFEE_FILE_FREE(hdr)) {
page = (page + COFFEE_PAGES_PER_SECTOR) & ~(COFFEE_PAGES_PER_SECTOR - 1);
} else if(COFFEE_PAGE_ISOLATED(hdr)) {
} else if(COFFEE_FILE_ISOLATED(hdr)) {
++page;
} else if(COFFEE_PAGE_ACTIVE(hdr) && !COFFEE_PAGE_LOG(hdr)) {
} else if(COFFEE_FILE_ACTIVE(hdr) && !COFFEE_FILE_LOG(hdr)) {
memcpy(record->name, hdr.name, sizeof(record->name));
record->name[sizeof(record->name) - 1] = '\0';
record->size = find_offset_in_file(page);
@ -1135,7 +1143,7 @@ cfs_coffee_configure_log(const char *file, unsigned log_size,
}
read_header(&hdr, page);
if(COFFEE_PAGE_MODIFIED(hdr)) {
if(COFFEE_FILE_MODIFIED(hdr)) {
/* Too late to customize the log. */
return -1;
}