static int ramzswap_major;
static struct ramzswap *devices;
-/*
- * Pages that compress to larger than this size are
- * forwarded to backing swap, if present or stored
- * uncompressed in memory otherwise.
- */
-static unsigned int max_zpage_size;
-
/* Module params (documentation at end) */
static unsigned int num_devices;
return 1;
}
-/*
- * memlimit cannot be greater than backing disk size.
- */
-static void ramzswap_set_memlimit(struct ramzswap *rzs, size_t totalram_bytes)
-{
- int memlimit_valid = 1;
-
- if (!rzs->memlimit) {
- pr_info("Memory limit not set.\n");
- memlimit_valid = 0;
- }
-
- if (rzs->memlimit > rzs->disksize) {
- pr_info("Memory limit cannot be greater than "
- "disksize: limit=%zu, disksize=%zu\n",
- rzs->memlimit, rzs->disksize);
- memlimit_valid = 0;
- }
-
- if (!memlimit_valid) {
- size_t mempart, disksize;
- pr_info("Using default: smaller of (%u%% of RAM) and "
- "(backing disk size).\n",
- default_memlimit_perc_ram);
- mempart = default_memlimit_perc_ram * (totalram_bytes / 100);
- disksize = rzs->disksize;
- rzs->memlimit = mempart > disksize ? disksize : mempart;
- }
-
- if (rzs->memlimit > totalram_bytes / 2) {
- pr_info(
- "Its not advisable setting limit more than half of "
- "size of memory since we expect a 2:1 compression ratio. "
- "Limit represents amount of *compressed* data we can keep "
- "in memory!\n"
- "\tMemory Size: %zu kB\n"
- "\tLimit you selected: %zu kB\n"
- "Continuing anyway ...\n",
- totalram_bytes >> 10, rzs->memlimit >> 10
- );
- }
-
- rzs->memlimit &= PAGE_MASK;
- BUG_ON(!rzs->memlimit);
-}
-
static void ramzswap_set_disksize(struct ramzswap *rzs, size_t totalram_bytes)
{
if (!rzs->disksize) {
/*
* Swap header (1st page of swap device) contains information
- * to indentify it as a swap partition. Prepare such a header
- * for ramzswap device (ramzswap0) so that swapon can identify
- * it as swap partition. In case backing swap device is provided,
- * copy its swap header.
+ * about a swap file/partition. Prepare such a header for the
+ * given ramzswap device so that swapon can identify it as a
+ * swap partition.
*/
-static int setup_swap_header(struct ramzswap *rzs, union swap_header *s)
+static void setup_swap_header(struct ramzswap *rzs, union swap_header *s)
{
- int ret = 0;
- struct page *page;
- struct address_space *mapping;
- union swap_header *backing_swap_header;
-
- /*
- * There is no backing swap device. Create a swap header
- * that is acceptable by swapon.
- */
- if (!rzs->backing_swap) {
- s->info.version = 1;
- s->info.last_page = (rzs->disksize >> PAGE_SHIFT) - 1;
- s->info.nr_badpages = 0;
- memcpy(s->magic.magic, "SWAPSPACE2", 10);
- return 0;
- }
-
- /*
- * We have a backing swap device. Copy its swap header
- * to ramzswap device header. If this header contains
- * invalid information (backing device not a swap
- * partition, etc.), swapon will fail for ramzswap
- * which is correct behavior - we don't want to swap
- * over filesystem partition!
- */
-
- /* Read the backing swap header (code from sys_swapon) */
- mapping = rzs->swap_file->f_mapping;
- if (!mapping->a_ops->readpage) {
- ret = -EINVAL;
- goto out;
- }
-
- page = read_mapping_page(mapping, 0, rzs->swap_file);
- if (IS_ERR(page)) {
- ret = PTR_ERR(page);
- goto out;
- }
-
- backing_swap_header = kmap(page);
- memcpy(s, backing_swap_header, sizeof(*s));
- if (s->info.nr_badpages) {
- pr_info("Cannot use backing swap with bad pages (%u)\n",
- s->info.nr_badpages);
- ret = -EINVAL;
- }
- /*
- * ramzswap disksize equals number of usable pages in backing
- * swap. Set last_page in swap header to match this disksize
- * ('last_page' means 0-based index of last usable swap page).
- */
+ s->info.version = 1;
s->info.last_page = (rzs->disksize >> PAGE_SHIFT) - 1;
- kunmap(page);
-
-out:
- return ret;
+ s->info.nr_badpages = 0;
+ memcpy(s->magic.magic, "SWAPSPACE2", 10);
}
static void ramzswap_ioctl_get_stats(struct ramzswap *rzs,
struct ramzswap_ioctl_stats *s)
{
- strncpy(s->backing_swap_name, rzs->backing_swap_name,
- MAX_SWAP_NAME_LEN - 1);
- s->backing_swap_name[MAX_SWAP_NAME_LEN - 1] = '\0';
-
s->disksize = rzs->disksize;
- s->memlimit = rzs->memlimit;
#if defined(CONFIG_RAMZSWAP_STATS)
{
s->orig_data_size = rs->pages_stored << PAGE_SHIFT;
s->compr_data_size = rs->compr_size;
s->mem_used_total = mem_used;
-
- s->bdev_num_reads = rzs_stat64_read(rzs, &rs->bdev_num_reads);
- s->bdev_num_writes = rzs_stat64_read(rzs, &rs->bdev_num_writes);
}
#endif /* CONFIG_RAMZSWAP_STATS */
}
-static int add_backing_swap_extent(struct ramzswap *rzs,
- pgoff_t phy_pagenum,
- pgoff_t num_pages)
-{
- unsigned int idx;
- struct list_head *head;
- struct page *curr_page, *new_page;
- unsigned int extents_per_page = PAGE_SIZE /
- sizeof(struct ramzswap_backing_extent);
-
- idx = rzs->num_extents % extents_per_page;
- if (!idx) {
- new_page = alloc_page(__GFP_ZERO);
- if (!new_page)
- return -ENOMEM;
-
- if (rzs->num_extents) {
- curr_page = virt_to_page(rzs->curr_extent);
- head = &curr_page->lru;
- } else {
- head = &rzs->backing_swap_extent_list;
- }
-
- list_add(&new_page->lru, head);
- rzs->curr_extent = page_address(new_page);
- }
-
- rzs->curr_extent->phy_pagenum = phy_pagenum;
- rzs->curr_extent->num_pages = num_pages;
-
- pr_debug("add_extent: idx=%u, phy_pgnum=%lu, num_pgs=%lu, "
- "pg_last=%lu, curr_ext=%p\n", idx, phy_pagenum, num_pages,
- phy_pagenum + num_pages - 1, rzs->curr_extent);
-
- if (idx != extents_per_page - 1)
- rzs->curr_extent++;
-
- return 0;
-}
-
-static int setup_backing_swap_extents(struct ramzswap *rzs,
- struct inode *inode, unsigned long *num_pages)
-{
- int ret = 0;
- unsigned blkbits;
- unsigned blocks_per_page;
- pgoff_t contig_pages = 0, total_pages = 0;
- pgoff_t pagenum = 0, prev_pagenum = 0;
- sector_t probe_block = 0;
- sector_t last_block;
-
- blkbits = inode->i_blkbits;
- blocks_per_page = PAGE_SIZE >> blkbits;
-
- last_block = i_size_read(inode) >> blkbits;
- while (probe_block + blocks_per_page <= last_block) {
- unsigned block_in_page;
- sector_t first_block;
-
- first_block = bmap(inode, probe_block);
- if (first_block == 0)
- goto bad_bmap;
-
- /* It must be PAGE_SIZE aligned on-disk */
- if (first_block & (blocks_per_page - 1)) {
- probe_block++;
- goto probe_next;
- }
-
- /* All blocks within this page must be contiguous on disk */
- for (block_in_page = 1; block_in_page < blocks_per_page;
- block_in_page++) {
- sector_t block;
-
- block = bmap(inode, probe_block + block_in_page);
- if (block == 0)
- goto bad_bmap;
- if (block != first_block + block_in_page) {
- /* Discontiguity */
- probe_block++;
- goto probe_next;
- }
- }
-
- /*
- * We found a PAGE_SIZE length, PAGE_SIZE aligned
- * run of blocks.
- */
- pagenum = first_block >> (PAGE_SHIFT - blkbits);
-
- if (total_pages && (pagenum != prev_pagenum + 1)) {
- ret = add_backing_swap_extent(rzs, prev_pagenum -
- (contig_pages - 1), contig_pages);
- if (ret < 0)
- goto out;
- rzs->num_extents++;
- contig_pages = 0;
- }
- total_pages++;
- contig_pages++;
- prev_pagenum = pagenum;
- probe_block += blocks_per_page;
-
-probe_next:
- continue;
- }
-
- if (contig_pages) {
- pr_debug("adding last extent: pagenum=%lu, "
- "contig_pages=%lu\n", pagenum, contig_pages);
- ret = add_backing_swap_extent(rzs,
- prev_pagenum - (contig_pages - 1), contig_pages);
- if (ret < 0)
- goto out;
- rzs->num_extents++;
- }
- if (!rzs->num_extents) {
- pr_err("No swap extents found!\n");
- ret = -EINVAL;
- }
-
- if (!ret) {
- *num_pages = total_pages;
- pr_info("Found %lu extents containing %luk\n",
- rzs->num_extents, *num_pages << (PAGE_SHIFT - 10));
- }
- goto out;
-
-bad_bmap:
- pr_err("Backing swapfile has holes\n");
- ret = -EINVAL;
-out:
- while (ret && !list_empty(&rzs->backing_swap_extent_list)) {
- struct page *page;
- struct list_head *entry = rzs->backing_swap_extent_list.next;
- page = list_entry(entry, struct page, lru);
- list_del(entry);
- __free_page(page);
- }
- return ret;
-}
-
-static void map_backing_swap_extents(struct ramzswap *rzs)
-{
- struct ramzswap_backing_extent *se;
- struct page *table_page, *se_page;
- unsigned long num_pages, num_table_pages, entry;
- unsigned long se_idx, span;
- unsigned entries_per_page = PAGE_SIZE / sizeof(*rzs->table);
- unsigned extents_per_page = PAGE_SIZE / sizeof(*se);
-
- /* True for block device */
- if (!rzs->num_extents)
- return;
-
- se_page = list_entry(rzs->backing_swap_extent_list.next,
- struct page, lru);
- se = page_address(se_page);
- span = se->num_pages;
- num_pages = rzs->disksize >> PAGE_SHIFT;
- num_table_pages = DIV_ROUND_UP(num_pages * sizeof(*rzs->table),
- PAGE_SIZE);
-
- entry = 0;
- se_idx = 0;
- while (num_table_pages--) {
- table_page = vmalloc_to_page(&rzs->table[entry]);
- while (span <= entry) {
- se_idx++;
- if (se_idx == rzs->num_extents)
- BUG();
-
- if (!(se_idx % extents_per_page)) {
- se_page = list_entry(se_page->lru.next,
- struct page, lru);
- se = page_address(se_page);
- } else
- se++;
-
- span += se->num_pages;
- }
- table_page->mapping = (struct address_space *)se;
- table_page->private = se->num_pages - (span - entry);
- pr_debug("map_table: entry=%lu, span=%lu, map=%p, priv=%lu\n",
- entry, span, table_page->mapping, table_page->private);
- entry += entries_per_page;
- }
-}
-
-/*
- * Check if value of backing_swap module param is sane.
- * Claim this device and set ramzswap size equal to
- * size of this block device.
- */
-static int setup_backing_swap(struct ramzswap *rzs)
-{
- int ret = 0;
- size_t disksize;
- unsigned long num_pages = 0;
- struct inode *inode;
- struct file *swap_file;
- struct address_space *mapping;
- struct block_device *bdev = NULL;
-
- if (!rzs->backing_swap_name[0]) {
- pr_debug("backing_swap param not given\n");
- goto out;
- }
-
- pr_info("Using backing swap device: %s\n", rzs->backing_swap_name);
-
- swap_file = filp_open(rzs->backing_swap_name,
- O_RDWR | O_LARGEFILE, 0);
- if (IS_ERR(swap_file)) {
- pr_err("Error opening backing device: %s\n",
- rzs->backing_swap_name);
- ret = -EINVAL;
- goto out;
- }
-
- mapping = swap_file->f_mapping;
- inode = mapping->host;
-
- if (S_ISBLK(inode->i_mode)) {
- bdev = I_BDEV(inode);
- ret = bd_claim(bdev, setup_backing_swap);
- if (ret < 0) {
- bdev = NULL;
- goto bad_param;
- }
- disksize = i_size_read(inode);
- /*
- * Can happen if user gives an extended partition as
- * backing swap or simply a bad disk.
- */
- if (!disksize) {
- pr_err("Error reading backing swap size.\n");
- goto bad_param;
- }
- } else if (S_ISREG(inode->i_mode)) {
- bdev = inode->i_sb->s_bdev;
- if (IS_SWAPFILE(inode)) {
- ret = -EBUSY;
- goto bad_param;
- }
- ret = setup_backing_swap_extents(rzs, inode, &num_pages);
- if (ret < 0)
- goto bad_param;
- disksize = num_pages << PAGE_SHIFT;
- } else {
- goto bad_param;
- }
-
- rzs->swap_file = swap_file;
- rzs->backing_swap = bdev;
- rzs->disksize = disksize;
-
- return 0;
-
-bad_param:
- if (bdev)
- bd_release(bdev);
- filp_close(swap_file, NULL);
-
-out:
- rzs->backing_swap = NULL;
- return ret;
-}
-
-/*
- * Map logical page number 'pagenum' to physical page number
- * on backing swap device. For block device, this is a nop.
- */
-static u32 map_backing_swap_page(struct ramzswap *rzs, u32 pagenum)
-{
- u32 skip_pages, entries_per_page;
- size_t delta, se_offset, skipped;
- struct page *table_page, *se_page;
- struct ramzswap_backing_extent *se;
-
- if (!rzs->num_extents)
- return pagenum;
-
- entries_per_page = PAGE_SIZE / sizeof(*rzs->table);
-
- table_page = vmalloc_to_page(&rzs->table[pagenum]);
- se = (struct ramzswap_backing_extent *)table_page->mapping;
- se_page = virt_to_page(se);
-
- skip_pages = pagenum - (pagenum / entries_per_page * entries_per_page);
- se_offset = table_page->private + skip_pages;
-
- if (se_offset < se->num_pages)
- return se->phy_pagenum + se_offset;
-
- skipped = se->num_pages - table_page->private;
- do {
- struct ramzswap_backing_extent *se_base;
- u32 se_entries_per_page = PAGE_SIZE / sizeof(*se);
-
- /* Get next swap extent */
- se_base = (struct ramzswap_backing_extent *)
- page_address(se_page);
- if (se - se_base == se_entries_per_page - 1) {
- se_page = list_entry(se_page->lru.next,
- struct page, lru);
- se = page_address(se_page);
- } else {
- se++;
- }
-
- skipped += se->num_pages;
- } while (skipped < skip_pages);
-
- delta = skipped - skip_pages;
- se_offset = se->num_pages - delta;
-
- return se->phy_pagenum + se_offset;
-}
-
static void ramzswap_free_page(struct ramzswap *rzs, size_t index)
{
u32 clen;
/*
* Called when request page is not present in ramzswap.
- * Its either in backing swap device (if present) or
- * this is an attempt to read before any previous write
+ * This is an attempt to read before any previous write
* to this location - this happens due to readahead when
* swap device is read from user-space (e.g. during swapon)
*/
static int handle_ramzswap_fault(struct ramzswap *rzs, struct bio *bio)
{
- /*
- * Always forward such requests to backing swap
- * device (if present)
- */
- if (rzs->backing_swap) {
- u32 pagenum;
- rzs_stat64_dec(rzs, &rzs->stats.num_reads);
- rzs_stat64_inc(rzs, &rzs->stats.bdev_num_reads);
- bio->bi_bdev = rzs->backing_swap;
-
- /*
- * In case backing swap is a file, find the right offset within
- * the file corresponding to logical position 'index'. For block
- * device, this is a nop.
- */
- pagenum = bio->bi_sector >> SECTORS_PER_PAGE_SHIFT;
- bio->bi_sector = map_backing_swap_page(rzs, pagenum)
- << SECTORS_PER_PAGE_SHIFT;
- return 1;
- }
-
- /*
- * Its unlikely event in case backing dev is
- * not present
- */
pr_debug("Read before write on swap device: "
"sector=%lu, size=%u, offset=%u\n",
(ulong)(bio->bi_sector), bio->bi_size,
static int ramzswap_write(struct ramzswap *rzs, struct bio *bio)
{
- int ret, fwd_write_request = 0;
+ int ret;
u32 offset, index;
size_t clen;
struct zobj_header *zheader;
src = rzs->compress_buffer;
- /*
- * System swaps to same sector again when the stored page
- * is no longer referenced by any process. So, its now safe
- * to free the memory that was allocated for this page.
- */
- if (rzs->table[index].page || rzs_test_flag(rzs, index, RZS_ZERO))
- ramzswap_free_page(rzs, index);
-
mutex_lock(&rzs->lock);
user_mem = kmap_atomic(page, KM_USER0);
return 0;
}
- if (rzs->backing_swap &&
- (rzs->stats.compr_size > rzs->memlimit - PAGE_SIZE)) {
- kunmap_atomic(user_mem, KM_USER0);
- mutex_unlock(&rzs->lock);
- fwd_write_request = 1;
- goto out;
- }
-
ret = lzo1x_1_compress(user_mem, PAGE_SIZE, src, &clen,
rzs->compress_workmem);
}
/*
- * Page is incompressible. Forward it to backing swap
- * if present. Otherwise, store it as-is (uncompressed)
+ * Page is incompressible. Store it as-is (uncompressed)
* since we do not want to return too many swap write
* errors which has side effect of hanging the system.
*/
if (unlikely(clen > max_zpage_size)) {
- if (rzs->backing_swap) {
- mutex_unlock(&rzs->lock);
- fwd_write_request = 1;
- goto out;
- }
-
clen = PAGE_SIZE;
page_store = alloc_page(GFP_NOIO | __GFP_HIGHMEM);
if (unlikely(!page_store)) {
pr_info("Error allocating memory for compressed "
"page: %u, size=%zu\n", index, clen);
rzs_stat64_inc(rzs, &rzs->stats.failed_writes);
- if (rzs->backing_swap)
- fwd_write_request = 1;
goto out;
}
return 0;
out:
- if (fwd_write_request) {
- rzs_stat64_inc(rzs, &rzs->stats.bdev_num_writes);
- bio->bi_bdev = rzs->backing_swap;
-#if 0
- /*
- * TODO: We currently have linear mapping of ramzswap and
- * backing swap sectors. This is not desired since we want
- * to optimize writes to backing swap to minimize disk seeks
- * or have effective wear leveling (for SSDs). Also, a
- * non-linear mapping is required to implement compressed
- * on-disk swapping.
- */
- bio->bi_sector = get_backing_swap_page()
- << SECTORS_PER_PAGE_SHIFT;
-#endif
- /*
- * In case backing swap is a file, find the right offset within
- * the file corresponding to logical position 'index'. For block
- * device, this is a nop.
- */
- bio->bi_sector = map_backing_swap_page(rzs, index)
- << SECTORS_PER_PAGE_SHIFT;
- return 1;
- }
-
bio_io_error(bio);
return 0;
}
static void reset_device(struct ramzswap *rzs)
{
- int is_backing_blkdev = 0;
- size_t index, num_pages;
- unsigned entries_per_page;
- unsigned long num_table_pages, entry = 0;
+ size_t index;
/* Do not accept any new I/O request */
rzs->init_done = 0;
- if (rzs->backing_swap && !rzs->num_extents)
- is_backing_blkdev = 1;
-
- num_pages = rzs->disksize >> PAGE_SHIFT;
-
/* Free various per-device buffers */
kfree(rzs->compress_workmem);
free_pages((unsigned long)rzs->compress_buffer, 1);
rzs->compress_buffer = NULL;
/* Free all pages that are still in this ramzswap device */
- for (index = 0; index < num_pages; index++) {
+ for (index = 0; index < rzs->disksize >> PAGE_SHIFT; index++) {
struct page *page;
u16 offset;
xv_free(rzs->mem_pool, page, offset);
}
- entries_per_page = PAGE_SIZE / sizeof(*rzs->table);
- num_table_pages = DIV_ROUND_UP(num_pages * sizeof(*rzs->table),
- PAGE_SIZE);
- /*
- * Set page->mapping to NULL for every table page.
- * Otherwise, we will hit bad_page() during free.
- */
- while (rzs->num_extents && num_table_pages--) {
- struct page *page;
- page = vmalloc_to_page(&rzs->table[entry]);
- page->mapping = NULL;
- entry += entries_per_page;
- }
vfree(rzs->table);
rzs->table = NULL;
xv_destroy_pool(rzs->mem_pool);
rzs->mem_pool = NULL;
- /* Free all swap extent pages */
- while (!list_empty(&rzs->backing_swap_extent_list)) {
- struct page *page;
- struct list_head *entry;
- entry = rzs->backing_swap_extent_list.next;
- page = list_entry(entry, struct page, lru);
- list_del(entry);
- __free_page(page);
- }
- INIT_LIST_HEAD(&rzs->backing_swap_extent_list);
- rzs->num_extents = 0;
-
- /* Close backing swap device, if present */
- if (rzs->backing_swap) {
- if (is_backing_blkdev)
- bd_release(rzs->backing_swap);
- filp_close(rzs->swap_file, NULL);
- rzs->backing_swap = NULL;
- memset(rzs->backing_swap_name, 0, MAX_SWAP_NAME_LEN);
- }
-
/* Reset stats */
memset(&rzs->stats, 0, sizeof(rzs->stats));
rzs->disksize = 0;
- rzs->memlimit = 0;
}
static int ramzswap_ioctl_init_device(struct ramzswap *rzs)
return -EBUSY;
}
- ret = setup_backing_swap(rzs);
- if (ret)
- goto fail;
-
- if (rzs->backing_swap)
- ramzswap_set_memlimit(rzs, totalram_pages << PAGE_SHIFT);
- else
- ramzswap_set_disksize(rzs, totalram_pages << PAGE_SHIFT);
+ ramzswap_set_disksize(rzs, totalram_pages << PAGE_SHIFT);
rzs->compress_workmem = kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
if (!rzs->compress_workmem) {
}
memset(rzs->table, 0, num_pages * sizeof(*rzs->table));
- map_backing_swap_extents(rzs);
-
page = alloc_page(__GFP_ZERO);
if (!page) {
pr_err("Error allocating swap header page\n");
rzs_set_flag(rzs, 0, RZS_UNCOMPRESSED);
swap_header = kmap(page);
- ret = setup_swap_header(rzs, swap_header);
+ setup_swap_header(rzs, swap_header);
kunmap(page);
- if (ret) {
- pr_err("Error setting swap header\n");
- goto fail;
- }
set_capacity(rzs->disk, rzs->disksize >> SECTOR_SHIFT);
- /*
- * We have ident mapping of sectors for ramzswap and
- * and the backing swap device. So, this queue flag
- * should be according to backing dev.
- */
- if (!rzs->backing_swap ||
- blk_queue_nonrot(rzs->backing_swap->bd_disk->queue))
- queue_flag_set_unlocked(QUEUE_FLAG_NONROT, rzs->disk->queue);
+ /* ramzswap devices sort of resembles non-rotational disks */
+ queue_flag_set_unlocked(QUEUE_FLAG_NONROT, rzs->disk->queue);
rzs->mem_pool = xv_create_pool();
if (!rzs->mem_pool) {
goto fail;
}
- /*
- * Pages that compress to size greater than this are forwarded
- * to physical swap disk (if backing dev is provided)
- * TODO: make this configurable
- */
- if (rzs->backing_swap)
- max_zpage_size = max_zpage_size_bdev;
- else
- max_zpage_size = max_zpage_size_nobdev;
- pr_debug("Max compressed page size: %u bytes\n", max_zpage_size);
-
rzs->init_done = 1;
pr_debug("Initialization done!\n");
unsigned int cmd, unsigned long arg)
{
int ret = 0;
- size_t disksize_kb, memlimit_kb;
+ size_t disksize_kb;
struct ramzswap *rzs = bdev->bd_disk->private_data;
pr_info("Disk size set to %zu kB\n", disksize_kb);
break;
- case RZSIO_SET_MEMLIMIT_KB:
- if (rzs->init_done) {
- /* TODO: allow changing memlimit */
- ret = -EBUSY;
- goto out;
- }
- if (copy_from_user(&memlimit_kb, (void *)arg,
- _IOC_SIZE(cmd))) {
- ret = -EFAULT;
- goto out;
- }
- rzs->memlimit = memlimit_kb << 10;
- pr_info("Memory limit set to %zu kB\n", memlimit_kb);
- break;
-
- case RZSIO_SET_BACKING_SWAP:
- if (rzs->init_done) {
- ret = -EBUSY;
- goto out;
- }
-
- if (copy_from_user(&rzs->backing_swap_name, (void *)arg,
- _IOC_SIZE(cmd))) {
- ret = -EFAULT;
- goto out;
- }
- rzs->backing_swap_name[MAX_SWAP_NAME_LEN - 1] = '\0';
- pr_info("Backing swap set to %s\n", rzs->backing_swap_name);
- break;
-
case RZSIO_GET_STATS:
{
struct ramzswap_ioctl_stats *stats;
return ret;
}
+void ramzswap_slot_free_notify(struct block_device *bdev, unsigned long index)
+{
+ struct ramzswap *rzs;
+
+ rzs = bdev->bd_disk->private_data;
+ ramzswap_free_page(rzs, index);
+ rzs_stat64_inc(rzs, &rzs->stats.notify_free);
+
+ return;
+}
+
static struct block_device_operations ramzswap_devops = {
.ioctl = ramzswap_ioctl,
- .owner = THIS_MODULE,
+ .swap_slot_free_notify = ramzswap_slot_free_notify,
+ .owner = THIS_MODULE
};
static int create_device(struct ramzswap *rzs, int device_id)
mutex_init(&rzs->lock);
spin_lock_init(&rzs->stat64_lock);
- INIT_LIST_HEAD(&rzs->backing_swap_extent_list);
rzs->queue = blk_alloc_queue(GFP_KERNEL);
if (!rzs->queue) {
rzs->disk->private_data = rzs;
snprintf(rzs->disk->disk_name, 16, "ramzswap%d", device_id);
- /*
- * Actual capacity set using RZSIO_SET_DISKSIZE_KB ioctl
- * or set equal to backing swap device (if provided)
- */
+ /* Actual capacity set using RZSIO_SET_DISKSIZE_KB ioctl */
set_capacity(rzs->disk, 0);
blk_queue_physical_block_size(rzs->disk->queue, PAGE_SIZE);
git.openpandora.org / pandora-kernel.git / blobdiff