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authorChristoph Hellwig <hch@lst.de>2014-09-10 17:37:24 -0700
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-09-12 13:33:49 -0400
commit9cc475411779d635619c2d414da0769e3cbf796b (patch)
tree794f67ee82aa15c021ddcc29e05043791d47afcd /fs/nfs/blocklayout/blocklayoutdev.c
parent34dc93c2fc04da0d01acf8a1660b4ab276208af7 (diff)
pnfs/blocklayout: move extent processing to blocklayout.c
This isn't device(id) related, so move it into the main file. Simple move for now, the next commit will clean it up a bit. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/blocklayout/blocklayoutdev.c')
-rw-r--r--fs/nfs/blocklayout/blocklayoutdev.c186
1 files changed, 0 insertions, 186 deletions
diff --git a/fs/nfs/blocklayout/blocklayoutdev.c b/fs/nfs/blocklayout/blocklayoutdev.c
index d6527d20c508..2b54e2940288 100644
--- a/fs/nfs/blocklayout/blocklayoutdev.c
+++ b/fs/nfs/blocklayout/blocklayoutdev.c
@@ -40,19 +40,6 @@
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
-static int decode_sector_number(__be32 **rp, sector_t *sp)
-{
- uint64_t s;
-
- *rp = xdr_decode_hyper(*rp, &s);
- if (s & 0x1ff) {
- printk(KERN_WARNING "NFS: %s: sector not aligned\n", __func__);
- return -1;
- }
- *sp = s >> SECTOR_SHIFT;
- return 0;
-}
-
ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
size_t mlen)
{
@@ -183,176 +170,3 @@ bl_free_deviceid_node(struct nfs4_deviceid_node *d)
kfree(dev);
}
-
-/* Tracks info needed to ensure extents in layout obey constraints of spec */
-struct layout_verification {
- u32 mode; /* R or RW */
- u64 start; /* Expected start of next non-COW extent */
- u64 inval; /* Start of INVAL coverage */
- u64 cowread; /* End of COW read coverage */
-};
-
-/* Verify the extent meets the layout requirements of the pnfs-block draft,
- * section 2.3.1.
- */
-static int verify_extent(struct pnfs_block_extent *be,
- struct layout_verification *lv)
-{
- if (lv->mode == IOMODE_READ) {
- if (be->be_state == PNFS_BLOCK_READWRITE_DATA ||
- be->be_state == PNFS_BLOCK_INVALID_DATA)
- return -EIO;
- if (be->be_f_offset != lv->start)
- return -EIO;
- lv->start += be->be_length;
- return 0;
- }
- /* lv->mode == IOMODE_RW */
- if (be->be_state == PNFS_BLOCK_READWRITE_DATA) {
- if (be->be_f_offset != lv->start)
- return -EIO;
- if (lv->cowread > lv->start)
- return -EIO;
- lv->start += be->be_length;
- lv->inval = lv->start;
- return 0;
- } else if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
- if (be->be_f_offset != lv->start)
- return -EIO;
- lv->start += be->be_length;
- return 0;
- } else if (be->be_state == PNFS_BLOCK_READ_DATA) {
- if (be->be_f_offset > lv->start)
- return -EIO;
- if (be->be_f_offset < lv->inval)
- return -EIO;
- if (be->be_f_offset < lv->cowread)
- return -EIO;
- /* It looks like you might want to min this with lv->start,
- * but you really don't.
- */
- lv->inval = lv->inval + be->be_length;
- lv->cowread = be->be_f_offset + be->be_length;
- return 0;
- } else
- return -EIO;
-}
-
-/* XDR decode pnfs_block_layout4 structure */
-int
-nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
- struct nfs4_layoutget_res *lgr, gfp_t gfp_flags)
-{
- struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
- int i, status = -EIO;
- uint32_t count;
- struct pnfs_block_extent *be = NULL, *save;
- struct xdr_stream stream;
- struct xdr_buf buf;
- struct page *scratch;
- __be32 *p;
- struct layout_verification lv = {
- .mode = lgr->range.iomode,
- .start = lgr->range.offset >> SECTOR_SHIFT,
- .inval = lgr->range.offset >> SECTOR_SHIFT,
- .cowread = lgr->range.offset >> SECTOR_SHIFT,
- };
- LIST_HEAD(extents);
-
- dprintk("---> %s\n", __func__);
-
- scratch = alloc_page(gfp_flags);
- if (!scratch)
- return -ENOMEM;
-
- xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
- xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
-
- p = xdr_inline_decode(&stream, 4);
- if (unlikely(!p))
- goto out_err;
-
- count = be32_to_cpup(p++);
-
- dprintk("%s enter, number of extents %i\n", __func__, count);
- p = xdr_inline_decode(&stream, (28 + NFS4_DEVICEID4_SIZE) * count);
- if (unlikely(!p))
- goto out_err;
-
- /* Decode individual extents, putting them in temporary
- * staging area until whole layout is decoded to make error
- * recovery easier.
- */
- for (i = 0; i < count; i++) {
- struct nfs4_deviceid id;
-
- be = kzalloc(sizeof(struct pnfs_block_extent), GFP_NOFS);
- if (!be) {
- status = -ENOMEM;
- goto out_err;
- }
- memcpy(&id, p, NFS4_DEVICEID4_SIZE);
- p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
-
- be->be_device =
- nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), &id,
- lo->plh_lc_cred, gfp_flags);
- if (!be->be_device)
- goto out_err;
-
- /* The next three values are read in as bytes,
- * but stored as 512-byte sector lengths
- */
- if (decode_sector_number(&p, &be->be_f_offset) < 0)
- goto out_err;
- if (decode_sector_number(&p, &be->be_length) < 0)
- goto out_err;
- if (decode_sector_number(&p, &be->be_v_offset) < 0)
- goto out_err;
- be->be_state = be32_to_cpup(p++);
- if (verify_extent(be, &lv)) {
- dprintk("%s verify failed\n", __func__);
- goto out_err;
- }
- list_add_tail(&be->be_list, &extents);
- }
- if (lgr->range.offset + lgr->range.length !=
- lv.start << SECTOR_SHIFT) {
- dprintk("%s Final length mismatch\n", __func__);
- be = NULL;
- goto out_err;
- }
- if (lv.start < lv.cowread) {
- dprintk("%s Final uncovered COW extent\n", __func__);
- be = NULL;
- goto out_err;
- }
- /* Extents decoded properly, now try to merge them in to
- * existing layout extents.
- */
- list_for_each_entry_safe(be, save, &extents, be_list) {
- list_del(&be->be_list);
-
- status = ext_tree_insert(bl, be);
- if (status)
- goto out_free_list;
- }
- status = 0;
- out:
- __free_page(scratch);
- dprintk("%s returns %i\n", __func__, status);
- return status;
-
- out_err:
- nfs4_put_deviceid_node(be->be_device);
- kfree(be);
- out_free_list:
- while (!list_empty(&extents)) {
- be = list_first_entry(&extents, struct pnfs_block_extent,
- be_list);
- list_del(&be->be_list);
- nfs4_put_deviceid_node(be->be_device);
- kfree(be);
- }
- goto out;
-}

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