From: Anna Schumaker <[email protected]>
But only one of each right now. We'll expand on this in the next patch.
Signed-off-by: Anna Schumaker <[email protected]>
---
v5: If we've already encoded a segment, then return a short read if
later segments return an error for some reason.
---
fs/nfsd/nfs4xdr.c | 56 +++++++++++++++++++++++++++++++++--------------
1 file changed, 40 insertions(+), 16 deletions(-)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index e633e1290c78..7ed9181a69d4 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -4603,7 +4603,7 @@ nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
static __be32
nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
struct nfsd4_read *read,
- unsigned long maxcount, u32 *eof)
+ unsigned long *maxcount, u32 *eof)
{
struct xdr_stream *xdr = &resp->xdr;
struct file *file = read->rd_nf->nf_file;
@@ -4614,20 +4614,20 @@ nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
__be64 tmp64;
if (hole_pos > read->rd_offset)
- maxcount = min_t(unsigned long, maxcount, hole_pos - read->rd_offset);
- maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
+ *maxcount = min_t(unsigned long, *maxcount, hole_pos - read->rd_offset);
+ *maxcount = min_t(unsigned long, *maxcount, (xdr->buf->buflen - xdr->buf->len));
/* Content type, offset, byte count */
p = xdr_reserve_space(xdr, 4 + 8 + 4);
if (!p)
return nfserr_resource;
- read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount);
+ read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, *maxcount);
if (read->rd_vlen < 0)
return nfserr_resource;
nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
- resp->rqstp->rq_vec, read->rd_vlen, &maxcount, eof);
+ resp->rqstp->rq_vec, read->rd_vlen, maxcount, eof);
if (nfserr)
return nfserr;
@@ -4635,7 +4635,7 @@ nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
write_bytes_to_xdr_buf(xdr->buf, starting_len, &tmp, 4);
tmp64 = cpu_to_be64(read->rd_offset);
write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp64, 8);
- tmp = htonl(maxcount);
+ tmp = htonl(*maxcount);
write_bytes_to_xdr_buf(xdr->buf, starting_len + 12, &tmp, 4);
return nfs_ok;
}
@@ -4643,11 +4643,19 @@ nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
static __be32
nfsd4_encode_read_plus_hole(struct nfsd4_compoundres *resp,
struct nfsd4_read *read,
- unsigned long maxcount, u32 *eof)
+ unsigned long *maxcount, u32 *eof)
{
struct file *file = read->rd_nf->nf_file;
+ loff_t data_pos = vfs_llseek(file, read->rd_offset, SEEK_DATA);
+ unsigned long count;
__be32 *p;
+ if (data_pos == -ENXIO)
+ data_pos = i_size_read(file_inode(file));
+ else if (data_pos <= read->rd_offset)
+ return nfserr_resource;
+ count = data_pos - read->rd_offset;
+
/* Content type, offset, byte count */
p = xdr_reserve_space(&resp->xdr, 4 + 8 + 8);
if (!p)
@@ -4655,9 +4663,10 @@ nfsd4_encode_read_plus_hole(struct nfsd4_compoundres *resp,
*p++ = htonl(NFS4_CONTENT_HOLE);
p = xdr_encode_hyper(p, read->rd_offset);
- p = xdr_encode_hyper(p, maxcount);
+ p = xdr_encode_hyper(p, count);
- *eof = (read->rd_offset + maxcount) >= i_size_read(file_inode(file));
+ *eof = (read->rd_offset + count) >= i_size_read(file_inode(file));
+ *maxcount = min_t(unsigned long, count, *maxcount);
return nfs_ok;
}
@@ -4665,7 +4674,7 @@ static __be32
nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_read *read)
{
- unsigned long maxcount;
+ unsigned long maxcount, count;
struct xdr_stream *xdr = &resp->xdr;
struct file *file;
int starting_len = xdr->buf->len;
@@ -4688,6 +4697,7 @@ nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
maxcount = min_t(unsigned long, maxcount,
(xdr->buf->buflen - xdr->buf->len));
maxcount = min_t(unsigned long, maxcount, read->rd_length);
+ count = maxcount;
eof = read->rd_offset >= i_size_read(file_inode(file));
if (eof)
@@ -4696,24 +4706,38 @@ nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
pos = vfs_llseek(file, read->rd_offset, SEEK_DATA);
if (pos == -ENXIO)
pos = i_size_read(file_inode(file));
+ else if (pos < 0)
+ pos = read->rd_offset;
- if (pos > read->rd_offset) {
- maxcount = pos - read->rd_offset;
- nfserr = nfsd4_encode_read_plus_hole(resp, read, maxcount, &eof);
+ if (pos == read->rd_offset) {
+ maxcount = count;
+ nfserr = nfsd4_encode_read_plus_data(resp, read, &maxcount, &eof);
+ if (nfserr)
+ goto out;
+ count -= maxcount;
+ read->rd_offset += maxcount;
segments++;
- } else {
- nfserr = nfsd4_encode_read_plus_data(resp, read, maxcount, &eof);
+ }
+
+ if (count > 0 && !eof) {
+ maxcount = count;
+ nfserr = nfsd4_encode_read_plus_hole(resp, read, &maxcount, &eof);
+ if (nfserr)
+ goto out;
+ count -= maxcount;
+ read->rd_offset += maxcount;
segments++;
}
out:
- if (nfserr)
+ if (nfserr && segments == 0)
xdr_truncate_encode(xdr, starting_len);
else {
tmp = htonl(eof);
write_bytes_to_xdr_buf(xdr->buf, starting_len, &tmp, 4);
tmp = htonl(segments);
write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
+ nfserr = nfs_ok;
}
return nfserr;
--
2.28.0