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pnfs/blocklayout: implement the return_range method 

This allows removing extents from the extent tree especially on truncate
operations, and thus fixing reads from truncated and re-extended that
previously returned stale data.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Christoph Hellwig 2014-09-10 08:23:35 -07:00 committed by Trond Myklebust
parent 8067253c8c
commit 71d5b76302
1 changed files with 30 additions and 0 deletions
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30
fs/nfs/blocklayout/blocklayout.c
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@ -469,6 +469,35 @@ static struct pnfs_layout_segment *bl_alloc_lseg(struct pnfs_layout_hdr *lo,
return lseg;
}
static void
bl_return_range(struct pnfs_layout_hdr *lo,
struct pnfs_layout_range *range)
{
struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
sector_t offset = range->offset >> SECTOR_SHIFT, end;
int err;
if (range->offset % 8) {
dprintk("%s: offset %lld not block size aligned\n",
__func__, range->offset);
return;
}
if (range->length != NFS4_MAX_UINT64) {
if (range->length % 8) {
dprintk("%s: length %lld not block size aligned\n",
__func__, range->length);
return;
}
end = offset + (range->length >> SECTOR_SHIFT);
} else {
end = round_down(NFS4_MAX_UINT64, PAGE_SIZE);
}
err = ext_tree_remove(bl, range->iomode & IOMODE_RW, offset, end);
}
static void
bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr,
const struct nfs4_layoutcommit_args *arg)
@ -777,6 +806,7 @@ static struct pnfs_layoutdriver_type blocklayout_type = {
.free_layout_hdr = bl_free_layout_hdr,
.alloc_lseg = bl_alloc_lseg,
.free_lseg = bl_free_lseg,
.return_range = bl_return_range,
.encode_layoutcommit = bl_encode_layoutcommit,
.cleanup_layoutcommit = bl_cleanup_layoutcommit,
.set_layoutdriver = bl_set_layoutdriver,