return rc;
}
-#ifndef HAVE_LDISKFS_MAP_BLOCKS
-
-#ifdef HAVE_EXT_PBLOCK /* Name changed to ext4_ext_pblock for kernel 2.6.35 */
-#define ldiskfs_ext_pblock(ex) ext_pblock((ex))
-#endif
-
-struct bpointers {
- sector_t *blocks;
- unsigned long start;
- int num;
- int init_num;
- int create;
-};
-
-static long ldiskfs_ext_find_goal(struct inode *inode,
- struct ldiskfs_ext_path *path,
- unsigned long block, int *aflags)
-{
- struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
- unsigned long bg_start;
- unsigned long colour;
- int depth;
-
- if (path) {
- struct ldiskfs_extent *ex;
- depth = path->p_depth;
-
- /* try to predict block placement */
- if ((ex = path[depth].p_ext))
- return ldiskfs_ext_pblock(ex) +
- (block - le32_to_cpu(ex->ee_block));
-
- /* it looks index is empty
- * try to find starting from index itself */
- if (path[depth].p_bh)
- return path[depth].p_bh->b_blocknr;
- }
-
- /* OK. use inode's group */
- bg_start = (ei->i_block_group * LDISKFS_BLOCKS_PER_GROUP(inode->i_sb)) +
- le32_to_cpu(LDISKFS_SB(inode->i_sb)->s_es->s_first_data_block);
- colour = (current->pid % 16) *
- (LDISKFS_BLOCKS_PER_GROUP(inode->i_sb) / 16);
- return bg_start + colour + block;
-}
-
-static unsigned long new_blocks(handle_t *handle, struct inode *inode,
- struct ldiskfs_ext_path *path,
- unsigned long block, unsigned long *count,
- int *err)
-{
- struct ldiskfs_allocation_request ar;
- unsigned long pblock;
- int aflags;
-
- /* find neighbour allocated blocks */
- ar.lleft = block;
- *err = ldiskfs_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
- if (*err)
- return 0;
- ar.lright = block;
- *err = ldiskfs_ext_search_right(inode, path, &ar.lright, &ar.pright);
- if (*err)
- return 0;
-
- /* allocate new block */
- ar.goal = ldiskfs_ext_find_goal(inode, path, block, &aflags);
- ar.inode = inode;
- ar.logical = block;
- ar.len = *count;
- ar.flags = LDISKFS_MB_HINT_DATA;
- pblock = ldiskfs_mb_new_blocks(handle, &ar, err);
- *count = ar.len;
- return pblock;
-}
-
-static int ldiskfs_ext_new_extent_cb(struct inode *inode,
- struct ldiskfs_ext_path *path,
- struct ldiskfs_ext_cache *cex,
-#ifdef HAVE_EXT_PREPARE_CB_EXTENT
- struct ldiskfs_extent *ex,
-#endif
- void *cbdata)
-{
- struct bpointers *bp = cbdata;
- struct ldiskfs_extent nex;
- unsigned long pblock = 0;
- unsigned long tgen;
- int err, i;
- unsigned long count;
- handle_t *handle;
-
-#ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
- if (cex->ec_type == LDISKFS_EXT_CACHE_EXTENT) {
-#else
- if ((cex->ec_len != 0) && (cex->ec_start != 0)) {
-#endif
- err = EXT_CONTINUE;
- goto map;
- }
-
- if (bp->create == 0) {
- i = 0;
- if (cex->ec_block < bp->start)
- i = bp->start - cex->ec_block;
- if (i >= cex->ec_len)
- CERROR("nothing to do?! i = %d, e_num = %u\n",
- i, cex->ec_len);
- for (; i < cex->ec_len && bp->num; i++) {
- *(bp->blocks) = 0;
- bp->blocks++;
- bp->num--;
- bp->start++;
- }
-
- return EXT_CONTINUE;
- }
-
- tgen = LDISKFS_I(inode)->i_ext_generation;
- count = ldiskfs_ext_calc_credits_for_insert(inode, path);
-
- handle = osd_journal_start(inode, LDISKFS_HT_MISC,
- count + LDISKFS_ALLOC_NEEDED + 1);
- if (IS_ERR(handle)) {
- return PTR_ERR(handle);
- }
-
- if (tgen != LDISKFS_I(inode)->i_ext_generation) {
- /* the tree has changed. so path can be invalid at moment */
- ldiskfs_journal_stop(handle);
- return EXT_REPEAT;
- }
-
- /* In 2.6.32 kernel, ldiskfs_ext_walk_space()'s callback func is not
- * protected by i_data_sem as whole. so we patch it to store
- * generation to path and now verify the tree hasn't changed */
- down_write((&LDISKFS_I(inode)->i_data_sem));
-
- /* validate extent, make sure the extent tree does not changed */
- if (LDISKFS_I(inode)->i_ext_generation != path[0].p_generation) {
- /* cex is invalid, try again */
- up_write(&LDISKFS_I(inode)->i_data_sem);
- ldiskfs_journal_stop(handle);
- return EXT_REPEAT;
- }
-
- count = cex->ec_len;
- pblock = new_blocks(handle, inode, path, cex->ec_block, &count, &err);
- if (!pblock)
- goto out;
- BUG_ON(count > cex->ec_len);
-
- /* insert new extent */
- nex.ee_block = cpu_to_le32(cex->ec_block);
- ldiskfs_ext_store_pblock(&nex, pblock);
- nex.ee_len = cpu_to_le16(count);
- err = ldiskfs_ext_insert_extent(handle, inode, path, &nex, 0);
- if (err) {
- /* free data blocks we just allocated */
- /* not a good idea to call discard here directly,
- * but otherwise we'd need to call it every free() */
- ldiskfs_discard_preallocations(inode);
-#ifdef HAVE_EXT_FREE_BLOCK_WITH_BUFFER_HEAD /* Introduced in 2.6.32-rc7 */
- ldiskfs_free_blocks(handle, inode, NULL,
- ldiskfs_ext_pblock(&nex),
- le16_to_cpu(nex.ee_len), 0);
-#else
- ldiskfs_free_blocks(handle, inode, ldiskfs_ext_pblock(&nex),
- le16_to_cpu(nex.ee_len), 0);
-#endif
- goto out;
- }
-
- /*
- * Putting len of the actual extent we just inserted,
- * we are asking ldiskfs_ext_walk_space() to continue
- * scaning after that block
- */
- cex->ec_len = le16_to_cpu(nex.ee_len);
- cex->ec_start = ldiskfs_ext_pblock(&nex);
- BUG_ON(le16_to_cpu(nex.ee_len) == 0);
- BUG_ON(le32_to_cpu(nex.ee_block) != cex->ec_block);
-
-out:
- up_write((&LDISKFS_I(inode)->i_data_sem));
- ldiskfs_journal_stop(handle);
-map:
- if (err >= 0) {
- /* map blocks */
- if (bp->num == 0) {
- CERROR("hmm. why do we find this extent?\n");
- CERROR("initial space: %lu:%u\n",
- bp->start, bp->init_num);
-#ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
- CERROR("current extent: %u/%u/%llu %d\n",
- cex->ec_block, cex->ec_len,
- (unsigned long long)cex->ec_start,
- cex->ec_type);
-#else
- CERROR("current extent: %u/%u/%llu\n",
- cex->ec_block, cex->ec_len,
- (unsigned long long)cex->ec_start);
-#endif
- }
- i = 0;
- if (cex->ec_block < bp->start)
- i = bp->start - cex->ec_block;
- if (i >= cex->ec_len)
- CERROR("nothing to do?! i = %d, e_num = %u\n",
- i, cex->ec_len);
- for (; i < cex->ec_len && bp->num; i++) {
- *(bp->blocks) = cex->ec_start + i;
- /* unmap any underlying metadata from
- * the block device mapping. b=6998.
- */
- if (pblock != 0)
- clean_bdev_aliases(inode->i_sb->s_bdev,
- *(bp->blocks), 1);
- bp->blocks++;
- bp->num--;
- bp->start++;
- }
- }
- return err;
-}
-
-static int osd_ldiskfs_map_nblocks(struct inode *inode, unsigned long index,
- int clen, sector_t *blocks, int create)
-{
- int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
- struct bpointers bp;
- int err;
-
- if (index + clen >= inode->i_sb->s_maxbytes >> PAGE_SHIFT)
- return -EFBIG;
-
- bp.blocks = blocks;
- bp.start = index * blocks_per_page;
- bp.init_num = bp.num = clen * blocks_per_page;
- bp.create = create;
-
- CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
- bp.start, bp.start + bp.num - 1, (unsigned)inode->i_ino);
-
- err = ldiskfs_ext_walk_space(inode, bp.start, bp.num,
- ldiskfs_ext_new_extent_cb, &bp);
- ldiskfs_ext_invalidate_cache(inode);
-
- return err;
-}
-
-static int osd_ldiskfs_map_bm_inode_pages(struct inode *inode,
- struct page **page, int pages,
- sector_t *blocks, int create)
-{
- int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
- pgoff_t bitmap_max_page_index;
- sector_t *b;
- int rc = 0, i;
-
- bitmap_max_page_index = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes >>
- PAGE_SHIFT;
- for (i = 0, b = blocks; i < pages; i++, page++) {
- if ((*page)->index + 1 >= bitmap_max_page_index) {
- rc = -EFBIG;
- break;
- }
- rc = ldiskfs_map_inode_page(inode, *page, b, create);
- if (rc) {
- CERROR("ino %lu, blk %llu create %d: rc %d\n",
- inode->i_ino,
- (unsigned long long)*b, create, rc);
- break;
- }
- b += blocks_per_page;
- }
- return rc;
-}
-
-static int osd_ldiskfs_map_ext_inode_pages(struct inode *inode,
- struct page **page,
- int pages, sector_t *blocks,
- int create)
-{
- int rc = 0, i = 0, clen = 0;
- struct page *fp = NULL;
-
- CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
- inode->i_ino, pages, (*page)->index);
-
- /* pages are sorted already. so, we just have to find
- * contig. space and process them properly */
- while (i < pages) {
- if (fp == NULL) {
- /* start new extent */
- fp = *page++;
- clen = 1;
- i++;
- continue;
- } else if (fp->index + clen == (*page)->index) {
- /* continue the extent */
- page++;
- clen++;
- i++;
- continue;
- }
-
- /* process found extent */
- rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
- blocks, create);
- if (rc)
- GOTO(cleanup, rc);
-
- /* look for next extent */
- fp = NULL;
- blocks += clen * (PAGE_SIZE >> inode->i_blkbits);
- }
-
- if (fp)
- rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
- blocks, create);
-
-cleanup:
- return rc;
-}
-
-static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
- int pages, sector_t *blocks,
- int create)
-{
- int rc;
-
- if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
- rc = osd_ldiskfs_map_ext_inode_pages(inode, page, pages,
- blocks, create);
- return rc;
- }
- rc = osd_ldiskfs_map_bm_inode_pages(inode, page, pages, blocks, create);
-
- return rc;
-}
-#else
static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
int pages, sector_t *blocks,
int create)
cleanup:
return rc;
}
-#endif /* HAVE_LDISKFS_MAP_BLOCKS */
static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
struct niobuf_local *lnb, int npages)
git://git.whamcloud.com / fs / lustre-release.git / commitdiff