* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <linux/slab.h>
#include <linux/writeback.h>
#include <linux/buffer_head.h>
#include <scsi/scsi_device.h>
enum { BIO_MAX_PAGES_KMALLOC =
(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
+ MAX_PAGES_KMALLOC =
+ PAGE_SIZE / sizeof(struct page *),
};
struct page_collect {
struct exofs_sb_info *sbi;
- struct request_queue *req_q;
struct inode *inode;
unsigned expected_pages;
struct exofs_io_state *ios;
- struct bio *bio;
+ struct page **pages;
+ unsigned alloc_pages;
unsigned nr_pages;
unsigned long length;
loff_t pg_first; /* keep 64bit also in 32-arches */
struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
pcol->sbi = sbi;
- /* Create master bios on first Q, later on cloning, each clone will be
- * allocated on it's destination Q
- */
- pcol->req_q = osd_request_queue(sbi->layout.s_ods[0]);
pcol->inode = inode;
pcol->expected_pages = expected_pages;
pcol->ios = NULL;
- pcol->bio = NULL;
+ pcol->pages = NULL;
+ pcol->alloc_pages = 0;
pcol->nr_pages = 0;
pcol->length = 0;
pcol->pg_first = -1;
{
pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
- pcol->bio = NULL;
+ pcol->pages = NULL;
+ pcol->alloc_pages = 0;
pcol->nr_pages = 0;
pcol->length = 0;
pcol->pg_first = -1;
* it might not end here. don't be left with nothing
*/
if (!pcol->expected_pages)
- pcol->expected_pages = BIO_MAX_PAGES_KMALLOC;
+ pcol->expected_pages = MAX_PAGES_KMALLOC;
}
static int pcol_try_alloc(struct page_collect *pcol)
{
- int pages = min_t(unsigned, pcol->expected_pages,
- BIO_MAX_PAGES_KMALLOC);
+ unsigned pages = min_t(unsigned, pcol->expected_pages,
+ MAX_PAGES_KMALLOC);
if (!pcol->ios) { /* First time allocate io_state */
int ret = exofs_get_io_state(&pcol->sbi->layout, &pcol->ios);
return ret;
}
+ /* TODO: easily support bio chaining */
+ pages = min_t(unsigned, pages,
+ pcol->sbi->layout.group_width * BIO_MAX_PAGES_KMALLOC);
+
for (; pages; pages >>= 1) {
- pcol->bio = bio_kmalloc(GFP_KERNEL, pages);
- if (likely(pcol->bio))
+ pcol->pages = kmalloc(pages * sizeof(struct page *),
+ GFP_KERNEL);
+ if (likely(pcol->pages)) {
+ pcol->alloc_pages = pages;
return 0;
+ }
}
- EXOFS_ERR("Failed to bio_kmalloc expected_pages=%u\n",
+ EXOFS_ERR("Failed to kmalloc expected_pages=%u\n",
pcol->expected_pages);
return -ENOMEM;
}
static void pcol_free(struct page_collect *pcol)
{
- if (pcol->bio) {
- bio_put(pcol->bio);
- pcol->bio = NULL;
- }
+ kfree(pcol->pages);
+ pcol->pages = NULL;
if (pcol->ios) {
exofs_put_io_state(pcol->ios);
static int pcol_add_page(struct page_collect *pcol, struct page *page,
unsigned len)
{
- int added_len = bio_add_pc_page(pcol->req_q, pcol->bio, page, len, 0);
- if (unlikely(len != added_len))
+ if (unlikely(pcol->nr_pages >= pcol->alloc_pages))
return -ENOMEM;
- ++pcol->nr_pages;
+ pcol->pages[pcol->nr_pages++] = page;
pcol->length += len;
return 0;
}
*/
static int __readpages_done(struct page_collect *pcol, bool do_unlock)
{
- struct bio_vec *bvec;
int i;
u64 resid;
u64 good_bytes;
pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
pcol->nr_pages);
- __bio_for_each_segment(bvec, pcol->bio, i, 0) {
- struct page *page = bvec->bv_page;
+ for (i = 0; i < pcol->nr_pages; i++) {
+ struct page *page = pcol->pages[i];
struct inode *inode = page->mapping->host;
int page_stat;
ret = update_read_page(page, page_stat);
if (do_unlock)
unlock_page(page);
- length += bvec->bv_len;
+ length += PAGE_SIZE;
}
pcol_free(pcol);
static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
{
- struct bio_vec *bvec;
int i;
- __bio_for_each_segment(bvec, pcol->bio, i, 0) {
- struct page *page = bvec->bv_page;
+ for (i = 0; i < pcol->nr_pages; i++) {
+ struct page *page = pcol->pages[i];
if (rw == READ)
update_read_page(page, ret);
struct page_collect *pcol_copy = NULL;
int ret;
- if (!pcol->bio)
+ if (!pcol->pages)
return 0;
/* see comment in _readpage() about sync reads */
WARN_ON(is_sync && (pcol->nr_pages != 1));
- ios->bio = pcol->bio;
+ ios->pages = pcol->pages;
+ ios->nr_pages = pcol->nr_pages;
ios->length = pcol->length;
ios->offset = pcol->pg_first << PAGE_CACHE_SHIFT;
goto try_again;
}
- if (!pcol->bio) {
+ if (!pcol->pages) {
ret = pcol_try_alloc(pcol);
if (unlikely(ret))
goto fail;
static void writepages_done(struct exofs_io_state *ios, void *p)
{
struct page_collect *pcol = p;
- struct bio_vec *bvec;
int i;
u64 resid;
u64 good_bytes;
pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
pcol->nr_pages);
- __bio_for_each_segment(bvec, pcol->bio, i, 0) {
- struct page *page = bvec->bv_page;
+ for (i = 0; i < pcol->nr_pages; i++) {
+ struct page *page = pcol->pages[i];
struct inode *inode = page->mapping->host;
int page_stat;
EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n",
inode->i_ino, page->index, page_stat);
- length += bvec->bv_len;
+ length += PAGE_SIZE;
}
pcol_free(pcol);
struct page_collect *pcol_copy = NULL;
int ret;
- if (!pcol->bio)
+ if (!pcol->pages)
return 0;
pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
*pcol_copy = *pcol;
- pcol_copy->bio->bi_rw |= (1 << BIO_RW); /* FIXME: bio_set_dir() */
-
- ios->bio = pcol_copy->bio;
+ ios->pages = pcol_copy->pages;
+ ios->nr_pages = pcol_copy->nr_pages;
ios->offset = pcol_copy->pg_first << PAGE_CACHE_SHIFT;
ios->length = pcol_copy->length;
ios->done = writepages_done;
goto try_again;
}
- if (!pcol->bio) {
+ if (!pcol->pages) {
ret = pcol_try_alloc(pcol);
if (unlikely(ret))
goto fail;
0);
/*
- * Read an inode from the OSD, and return it as is. We also return the size
- * attribute in the 'obj_size' argument.
+ * Read the Linux inode info from the OSD, and return it as is. In exofs the
+ * inode info is in an application specific page/attribute of the osd-object.
*/
static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
- struct exofs_fcb *inode, uint64_t *obj_size)
+ struct exofs_fcb *inode)
{
struct exofs_sb_info *sbi = sb->s_fs_info;
struct osd_attr attrs[] = {
[0] = g_attr_inode_data,
[1] = g_attr_inode_file_layout,
[2] = g_attr_inode_dir_layout,
- [3] = g_attr_logical_length,
};
struct exofs_io_state *ios;
struct exofs_on_disk_inode_layout *layout;
ios->in_attr_len = ARRAY_SIZE(attrs);
ret = exofs_sbi_read(ios);
- if (ret)
+ if (unlikely(ret)) {
+ EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n",
+ _LLU(ios->obj.id), ret);
+ memset(inode, 0, sizeof(*inode));
+ inode->i_mode = 0040000 | (0777 & ~022);
+ /* If object is lost on target we might as well enable it's
+ * delete.
+ */
+ if ((ret == -ENOENT) || (ret == -EINVAL))
+ ret = 0;
goto out;
+ }
ret = extract_attr_from_ios(ios, &attrs[0]);
if (ret) {
}
}
- *obj_size = ~0;
- ret = extract_attr_from_ios(ios, &attrs[3]);
- if (ret) {
- EXOFS_ERR("%s: extract_attr of logical_length failed\n",
- __func__);
- goto out;
- }
- *obj_size = get_unaligned_be64(attrs[3].val_ptr);
-
out:
exofs_put_io_state(ios);
return ret;
struct exofs_i_info *oi;
struct exofs_fcb fcb;
struct inode *inode;
- uint64_t obj_size;
int ret;
inode = iget_locked(sb, ino);
__oi_init(oi);
/* read the inode from the osd */
- ret = exofs_get_inode(sb, oi, &fcb, &obj_size);
+ ret = exofs_get_inode(sb, oi, &fcb);
if (ret)
goto bad_inode;
inode->i_blkbits = EXOFS_BLKSHIFT;
inode->i_generation = le32_to_cpu(fcb.i_generation);
- if ((inode->i_size != obj_size) &&
- (!exofs_inode_is_fast_symlink(inode))) {
- EXOFS_ERR("WARNING: Size of inode=%llu != object=%llu\n",
- inode->i_size, _LLU(obj_size));
- /* FIXME: call exofs_inode_recovery() */
- }
-
oi->i_dir_start_lookup = 0;
if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
return ret;
}
-int exofs_write_inode(struct inode *inode, int wait)
+int exofs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
- return exofs_update_inode(inode, wait);
+ return exofs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
}
/*
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff