forked from Minki/linux
pnfs/blocklayout: refactor extent processing
Factor out a helper for all per-extent work, and merge the now trivial functions for lseg allocation and parsing. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Christoph Hellwig
Trond Myklebust
parent
9cc4754117
commit
ca0fe1dfa5
@ -513,144 +513,147 @@ static int decode_sector_number(__be32 **rp, sector_t *sp)
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return 0;
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}
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/* XDR decode pnfs_block_layout4 structure */
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static int
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nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
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struct nfs4_layoutget_res *lgr, gfp_t gfp_flags)
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bl_alloc_extent(struct xdr_stream *xdr, struct pnfs_layout_hdr *lo,
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struct layout_verification *lv, struct list_head *extents,
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gfp_t gfp_mask)
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{
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struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
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int i, status = -EIO;
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uint32_t count;
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struct pnfs_block_extent *be = NULL, *save;
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struct xdr_stream stream;
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struct xdr_buf buf;
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struct page *scratch;
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struct pnfs_block_extent *be;
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struct nfs4_deviceid id;
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int error;
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__be32 *p;
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p = xdr_inline_decode(xdr, 28 + NFS4_DEVICEID4_SIZE);
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if (!p)
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return -EIO;
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be = kzalloc(sizeof(*be), GFP_NOFS);
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if (!be)
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return -ENOMEM;
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memcpy(&id, p, NFS4_DEVICEID4_SIZE);
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p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
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error = -EIO;
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be->be_device = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), &id,
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lo->plh_lc_cred, gfp_mask);
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if (!be->be_device)
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goto out_free_be;
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/*
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* The next three values are read in as bytes, but stored in the
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* extent structure in 512-byte granularity.
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*/
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if (decode_sector_number(&p, &be->be_f_offset) < 0)
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goto out_put_deviceid;
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if (decode_sector_number(&p, &be->be_length) < 0)
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goto out_put_deviceid;
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if (decode_sector_number(&p, &be->be_v_offset) < 0)
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goto out_put_deviceid;
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be->be_state = be32_to_cpup(p++);
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error = verify_extent(be, lv);
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if (error) {
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dprintk("%s: extent verification failed\n", __func__);
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goto out_put_deviceid;
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}
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list_add_tail(&be->be_list, extents);
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return 0;
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out_put_deviceid:
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nfs4_put_deviceid_node(be->be_device);
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out_free_be:
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kfree(be);
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return error;
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}
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static struct pnfs_layout_segment *
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bl_alloc_lseg(struct pnfs_layout_hdr *lo, struct nfs4_layoutget_res *lgr,
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gfp_t gfp_mask)
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{
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struct layout_verification lv = {
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.mode = lgr->range.iomode,
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.start = lgr->range.offset >> SECTOR_SHIFT,
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.inval = lgr->range.offset >> SECTOR_SHIFT,
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.cowread = lgr->range.offset >> SECTOR_SHIFT,
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};
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struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
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struct pnfs_layout_segment *lseg;
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struct xdr_buf buf;
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struct xdr_stream xdr;
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struct page *scratch;
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int status, i;
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uint32_t count;
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__be32 *p;
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LIST_HEAD(extents);
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dprintk("---> %s\n", __func__);
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scratch = alloc_page(gfp_flags);
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lseg = kzalloc(sizeof(*lseg), gfp_mask);
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if (!lseg)
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return ERR_PTR(-ENOMEM);
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status = -ENOMEM;
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scratch = alloc_page(gfp_mask);
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if (!scratch)
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return -ENOMEM;
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goto out;
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xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
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xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
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xdr_init_decode_pages(&xdr, &buf,
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lgr->layoutp->pages, lgr->layoutp->len);
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xdr_set_scratch_buffer(&xdr, page_address(scratch), PAGE_SIZE);
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p = xdr_inline_decode(&stream, 4);
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status = -EIO;
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p = xdr_inline_decode(&xdr, 4);
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if (unlikely(!p))
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goto out_err;
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goto out_free_scratch;
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count = be32_to_cpup(p++);
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dprintk("%s: number of extents %d\n", __func__, count);
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dprintk("%s enter, number of extents %i\n", __func__, count);
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p = xdr_inline_decode(&stream, (28 + NFS4_DEVICEID4_SIZE) * count);
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if (unlikely(!p))
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goto out_err;
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/* Decode individual extents, putting them in temporary
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* staging area until whole layout is decoded to make error
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* recovery easier.
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/*
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* Decode individual extents, putting them in temporary staging area
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* until whole layout is decoded to make error recovery easier.
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*/
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for (i = 0; i < count; i++) {
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struct nfs4_deviceid id;
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be = kzalloc(sizeof(struct pnfs_block_extent), GFP_NOFS);
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if (!be) {
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status = -ENOMEM;
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goto out_err;
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}
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memcpy(&id, p, NFS4_DEVICEID4_SIZE);
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p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
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be->be_device =
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nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), &id,
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lo->plh_lc_cred, gfp_flags);
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if (!be->be_device)
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goto out_err;
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/* The next three values are read in as bytes,
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* but stored as 512-byte sector lengths
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*/
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if (decode_sector_number(&p, &be->be_f_offset) < 0)
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goto out_err;
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if (decode_sector_number(&p, &be->be_length) < 0)
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goto out_err;
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if (decode_sector_number(&p, &be->be_v_offset) < 0)
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goto out_err;
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be->be_state = be32_to_cpup(p++);
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if (verify_extent(be, &lv)) {
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dprintk("%s verify failed\n", __func__);
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goto out_err;
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}
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list_add_tail(&be->be_list, &extents);
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status = bl_alloc_extent(&xdr, lo, &lv, &extents, gfp_mask);
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if (status)
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goto process_extents;
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}
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if (lgr->range.offset + lgr->range.length !=
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lv.start << SECTOR_SHIFT) {
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dprintk("%s Final length mismatch\n", __func__);
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be = NULL;
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goto out_err;
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status = -EIO;
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goto process_extents;
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}
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if (lv.start < lv.cowread) {
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dprintk("%s Final uncovered COW extent\n", __func__);
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be = NULL;
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goto out_err;
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status = -EIO;
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}
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/* Extents decoded properly, now try to merge them in to
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* existing layout extents.
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*/
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list_for_each_entry_safe(be, save, &extents, be_list) {
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list_del(&be->be_list);
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status = ext_tree_insert(bl, be);
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if (status)
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goto out_free_list;
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}
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status = 0;
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out:
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__free_page(scratch);
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dprintk("%s returns %i\n", __func__, status);
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return status;
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out_err:
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nfs4_put_deviceid_node(be->be_device);
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kfree(be);
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out_free_list:
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process_extents:
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while (!list_empty(&extents)) {
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be = list_first_entry(&extents, struct pnfs_block_extent,
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be_list);
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struct pnfs_block_extent *be =
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list_first_entry(&extents, struct pnfs_block_extent,
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be_list);
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list_del(&be->be_list);
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nfs4_put_deviceid_node(be->be_device);
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kfree(be);
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if (!status)
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status = ext_tree_insert(bl, be);
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if (status) {
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nfs4_put_deviceid_node(be->be_device);
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kfree(be);
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}
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}
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goto out;
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}
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/* We pretty much ignore lseg, and store all data layout wide, so we
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* can correctly merge.
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*/
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static struct pnfs_layout_segment *bl_alloc_lseg(struct pnfs_layout_hdr *lo,
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struct nfs4_layoutget_res *lgr,
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gfp_t gfp_flags)
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{
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struct pnfs_layout_segment *lseg;
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int status;
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dprintk("%s enter\n", __func__);
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lseg = kzalloc(sizeof(*lseg), gfp_flags);
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if (!lseg)
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return ERR_PTR(-ENOMEM);
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status = nfs4_blk_process_layoutget(lo, lgr, gfp_flags);
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out_free_scratch:
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__free_page(scratch);
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out:
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dprintk("%s returns %d\n", __func__, status);
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if (status) {
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/* We don't want to call the full-blown bl_free_lseg,
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* since on error extents were not touched.
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*/
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kfree(lseg);
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return ERR_PTR(status);
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}
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