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fixed GC bug with big files and unwanted buffer overwrite bug.

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This commit is contained in:
nvt-se 2009-06-10 15:03:35 +00:00
parent 1a2084b597
commit 349e14abd4
1 changed files with 34 additions and 21 deletions
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53
core/cfs/cfs-coffee.c
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@ -40,7 +40,7 @@
#include <limits.h>
#include <string.h>
#define DEBUG 0
#define DEBUG 1
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
@ -110,7 +110,7 @@
#define COFFEE_PAGES_PER_SECTOR \
((coffee_page_t)(COFFEE_SECTOR_SIZE / COFFEE_PAGE_SIZE))
struct sector_stats {
struct sector_status {
coffee_page_t active;
coffee_page_t obsolete;
coffee_page_t free;
@ -185,7 +185,7 @@ absolute_offset(coffee_page_t page, cfs_offset_t offset)
}
/*---------------------------------------------------------------------------*/
static coffee_page_t
get_sector_status(uint16_t sector, struct sector_stats *stats)
get_sector_status(uint16_t sector, struct sector_status *stats)
{
static coffee_page_t skip_pages;
static char last_pages_are_active;
@ -194,6 +194,7 @@ get_sector_status(uint16_t sector, struct sector_stats *stats)
coffee_page_t sector_start, sector_end;
coffee_page_t page;
memset(stats, 0, sizeof(*stats));
active = obsolete = free = 0;
if(sector == 0) {
@ -205,9 +206,19 @@ get_sector_status(uint16_t sector, struct sector_stats *stats)
sector_end = sector_start + COFFEE_PAGES_PER_SECTOR;
if(last_pages_are_active) {
active = skip_pages & (COFFEE_PAGES_PER_SECTOR - 1);
if(skip_pages >= COFFEE_PAGES_PER_SECTOR) {
stats->active = COFFEE_PAGES_PER_SECTOR;
skip_pages -= COFFEE_PAGES_PER_SECTOR;
return 0;
}
active = skip_pages;
} else {
obsolete = skip_pages & (COFFEE_PAGES_PER_SECTOR - 1);
if(skip_pages >= COFFEE_PAGES_PER_SECTOR) {
stats->obsolete = COFFEE_PAGES_PER_SECTOR;
skip_pages -= COFFEE_PAGES_PER_SECTOR;
return skip_pages + COFFEE_PAGES_PER_SECTOR;
}
obsolete = skip_pages;
}
for(page = sector_start + skip_pages; page < sector_end;) {
@ -269,8 +280,8 @@ static void
collect_garbage(int mode)
{
uint16_t sector;
struct sector_stats stats;
coffee_page_t first_page, skip_pages;
struct sector_status stats;
coffee_page_t first_page, isolation_count;
watchdog_stop();
@ -281,9 +292,10 @@ collect_garbage(int mode)
* erasable if there are only free or obsolete pages in it.
*/
for(sector = 0; sector < COFFEE_SECTOR_COUNT; sector++) {
skip_pages = get_sector_status(sector, &stats);
PRINTF("Coffee: Sector %u has %u active, %u free, and %u obsolete pages.\n",
sector, (unsigned)stats.active, (unsigned)stats.free, (unsigned)stats.obsolete);
isolation_count = get_sector_status(sector, &stats);
PRINTF("Coffee: Sector %u has %u active, %u obsolete, and %u free pages.\n",
sector, (unsigned)stats.active,
(unsigned)stats.obsolete, (unsigned)stats.free);
if(stats.active > 0) {
continue;
@ -296,8 +308,8 @@ collect_garbage(int mode)
*next_free = first_page;
}
if(skip_pages > 0) {
isolate_pages(first_page + COFFEE_PAGES_PER_SECTOR, skip_pages);
if(isolation_count > 0) {
isolate_pages(first_page + COFFEE_PAGES_PER_SECTOR, isolation_count);
}
COFFEE_ERASE(sector);
@ -659,8 +671,8 @@ create_log(struct file *file, struct file_header *hdr)
adjust_log_config(hdr, &log_record_size, &log_records);
size = log_records * sizeof(uint16_t); /* Log index size. */
size += log_records * log_record_size; /* Log data size. */
/* Log index size + log data size. */
size = log_records * (sizeof(uint16_t) + log_record_size);
log_file = reserve(hdr->name, page_count(size), 1, HDR_FLAG_LOG);
if(log_file == NULL) {
@ -758,10 +770,13 @@ find_next_record(struct file *file, coffee_page_t log_page,
{
int log_record, preferred_batch_size;
if(file->next_log_record >= 0) {
return file->next_log_record;
}
preferred_batch_size = log_records > COFFEE_LOG_TABLE_LIMIT ?
COFFEE_LOG_TABLE_LIMIT : log_records;
if(file->next_log_record == -1) {
{
/* The next log record is unknown. Search for it. */
uint16_t indices[preferred_batch_size];
uint16_t processed;
@ -781,8 +796,6 @@ find_next_record(struct file *file, coffee_page_t log_page,
}
}
}
} else {
log_record = file->next_log_record;
}
return log_record;
@ -1024,6 +1037,7 @@ cfs_write(int fd, const void *buf, unsigned size)
int i;
struct log_param lp;
cfs_offset_t bytes_left;
const char dummy[1] = { 0xff };
if(!(FD_VALID(fd) && FD_WRITABLE(fd))) {
return -1;
@ -1068,8 +1082,7 @@ cfs_write(int fd, const void *buf, unsigned size)
if(fdp->offset > file->end) {
/* Update the original file's end with a dummy write. */
*(char *)buf = 0xff;
COFFEE_WRITE(buf, 1, absolute_offset(file->page, fdp->offset));
COFFEE_WRITE(dummy, 1, absolute_offset(file->page, fdp->offset));
}
} else {
COFFEE_WRITE(buf, size, absolute_offset(file->page, fdp->offset));