* [PATCH v3 01/10] SUNRPC: Split out a function for setting current page
2020-08-03 17:00 [PATCH v3 00/10] NFS: Add support for the v4.2 READ_PLUS operation schumaker.anna
@ 2020-08-03 17:00 ` schumaker.anna
2020-08-03 17:00 ` [PATCH v3 02/10] SUNRPC: Implement a xdr_page_pos() function schumaker.anna
` (8 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: schumaker.anna @ 2020-08-03 17:00 UTC (permalink / raw)
To: linux-nfs; +Cc: Anna.Schumaker
From: Anna Schumaker <Anna.Schumaker@Netapp.com>
I'm going to need this bit of code in a few places for READ_PLUS
decoding, so let's make it a helper function.
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
net/sunrpc/xdr.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 6dfe5dc8b35f..c62b0882c0d8 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -870,6 +870,13 @@ static int xdr_set_page_base(struct xdr_stream *xdr,
return 0;
}
+static void xdr_set_page(struct xdr_stream *xdr, unsigned int base,
+ unsigned int len)
+{
+ if (xdr_set_page_base(xdr, base, len) < 0)
+ xdr_set_iov(xdr, xdr->buf->tail, xdr->nwords << 2);
+}
+
static void xdr_set_next_page(struct xdr_stream *xdr)
{
unsigned int newbase;
@@ -877,8 +884,7 @@ static void xdr_set_next_page(struct xdr_stream *xdr)
newbase = (1 + xdr->page_ptr - xdr->buf->pages) << PAGE_SHIFT;
newbase -= xdr->buf->page_base;
- if (xdr_set_page_base(xdr, newbase, PAGE_SIZE) < 0)
- xdr_set_iov(xdr, xdr->buf->tail, xdr->nwords << 2);
+ xdr_set_page(xdr, newbase, PAGE_SIZE);
}
static bool xdr_set_next_buffer(struct xdr_stream *xdr)
@@ -886,8 +892,7 @@ static bool xdr_set_next_buffer(struct xdr_stream *xdr)
if (xdr->page_ptr != NULL)
xdr_set_next_page(xdr);
else if (xdr->iov == xdr->buf->head) {
- if (xdr_set_page_base(xdr, 0, PAGE_SIZE) < 0)
- xdr_set_iov(xdr, xdr->buf->tail, xdr->nwords << 2);
+ xdr_set_page(xdr, 0, PAGE_SIZE);
}
return xdr->p != xdr->end;
}
--
2.27.0
^ permalink raw reply related [flat|nested] 11+ messages in thread* [PATCH v3 02/10] SUNRPC: Implement a xdr_page_pos() function
2020-08-03 17:00 [PATCH v3 00/10] NFS: Add support for the v4.2 READ_PLUS operation schumaker.anna
2020-08-03 17:00 ` [PATCH v3 01/10] SUNRPC: Split out a function for setting current page schumaker.anna
@ 2020-08-03 17:00 ` schumaker.anna
2020-08-03 17:00 ` [PATCH v3 03/10] NFS: Use xdr_page_pos() in NFSv4 decode_getacl() schumaker.anna
` (7 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: schumaker.anna @ 2020-08-03 17:00 UTC (permalink / raw)
To: linux-nfs; +Cc: Anna.Schumaker
From: Anna Schumaker <Anna.Schumaker@Netapp.com>
I'll need this for READ_PLUS to help figure out the offset where page
data is stored at, but it might also be useful for other things.
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
include/linux/sunrpc/xdr.h | 1 +
net/sunrpc/xdr.c | 13 +++++++++++++
2 files changed, 14 insertions(+)
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index bac459584dd0..40318ff97c83 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -242,6 +242,7 @@ extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen);
extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
unsigned int base, unsigned int len);
extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);
+extern unsigned int xdr_page_pos(const struct xdr_stream *xdr);
extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf,
__be32 *p, struct rpc_rqst *rqst);
extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index c62b0882c0d8..8d29450fdce5 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -505,6 +505,19 @@ unsigned int xdr_stream_pos(const struct xdr_stream *xdr)
}
EXPORT_SYMBOL_GPL(xdr_stream_pos);
+/**
+ * xdr_page_pos - Return the current offset from the start of the xdr pages
+ * @xdr: pointer to struct xdr_stream
+ */
+unsigned int xdr_page_pos(const struct xdr_stream *xdr)
+{
+ unsigned int pos = xdr_stream_pos(xdr);
+
+ WARN_ON(pos < xdr->buf->head[0].iov_len);
+ return pos - xdr->buf->head[0].iov_len;
+}
+EXPORT_SYMBOL_GPL(xdr_page_pos);
+
/**
* xdr_init_encode - Initialize a struct xdr_stream for sending data.
* @xdr: pointer to xdr_stream struct
--
2.27.0
^ permalink raw reply related [flat|nested] 11+ messages in thread* [PATCH v3 03/10] NFS: Use xdr_page_pos() in NFSv4 decode_getacl()
2020-08-03 17:00 [PATCH v3 00/10] NFS: Add support for the v4.2 READ_PLUS operation schumaker.anna
2020-08-03 17:00 ` [PATCH v3 01/10] SUNRPC: Split out a function for setting current page schumaker.anna
2020-08-03 17:00 ` [PATCH v3 02/10] SUNRPC: Implement a xdr_page_pos() function schumaker.anna
@ 2020-08-03 17:00 ` schumaker.anna
2020-08-03 17:00 ` [PATCH v3 04/10] NFS: Add READ_PLUS data segment support schumaker.anna
` (6 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: schumaker.anna @ 2020-08-03 17:00 UTC (permalink / raw)
To: linux-nfs; +Cc: Anna.Schumaker
From: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
fs/nfs/nfs4xdr.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 47817ef0aadb..6742646d4feb 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -5279,7 +5279,6 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
uint32_t attrlen,
bitmap[3] = {0};
int status;
- unsigned int pg_offset;
res->acl_len = 0;
if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
@@ -5287,9 +5286,6 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
xdr_enter_page(xdr, xdr->buf->page_len);
- /* Calculate the offset of the page data */
- pg_offset = xdr->buf->head[0].iov_len;
-
if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
goto out;
if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
@@ -5302,7 +5298,7 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
/* The bitmap (xdr len + bitmaps) and the attr xdr len words
* are stored with the acl data to handle the problem of
* variable length bitmaps.*/
- res->acl_data_offset = xdr_stream_pos(xdr) - pg_offset;
+ res->acl_data_offset = xdr_page_pos(xdr);
res->acl_len = attrlen;
/* Check for receive buffer overflow */
--
2.27.0
^ permalink raw reply related [flat|nested] 11+ messages in thread* [PATCH v3 04/10] NFS: Add READ_PLUS data segment support
2020-08-03 17:00 [PATCH v3 00/10] NFS: Add support for the v4.2 READ_PLUS operation schumaker.anna
` (2 preceding siblings ...)
2020-08-03 17:00 ` [PATCH v3 03/10] NFS: Use xdr_page_pos() in NFSv4 decode_getacl() schumaker.anna
@ 2020-08-03 17:00 ` schumaker.anna
2020-08-03 17:00 ` [PATCH v3 05/10] SUNRPC: Split out xdr_realign_pages() from xdr_align_pages() schumaker.anna
` (5 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: schumaker.anna @ 2020-08-03 17:00 UTC (permalink / raw)
To: linux-nfs; +Cc: Anna.Schumaker
From: Anna Schumaker <Anna.Schumaker@Netapp.com>
This patch adds client support for decoding a single NFS4_CONTENT_DATA
segment returned by the server. This is the simplest implementation
possible, since it does not account for any hole segments in the reply.
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
fs/nfs/nfs42xdr.c | 140 ++++++++++++++++++++++++++++++++++++++
fs/nfs/nfs4proc.c | 43 +++++++++++-
fs/nfs/nfs4xdr.c | 1 +
include/linux/nfs4.h | 2 +-
include/linux/nfs_fs_sb.h | 1 +
include/linux/nfs_xdr.h | 2 +-
6 files changed, 184 insertions(+), 5 deletions(-)
diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c
index c03f3246d6c5..9a1e18295e55 100644
--- a/fs/nfs/nfs42xdr.c
+++ b/fs/nfs/nfs42xdr.c
@@ -45,6 +45,15 @@
#define encode_deallocate_maxsz (op_encode_hdr_maxsz + \
encode_fallocate_maxsz)
#define decode_deallocate_maxsz (op_decode_hdr_maxsz)
+#define encode_read_plus_maxsz (op_encode_hdr_maxsz + \
+ encode_stateid_maxsz + 3)
+#define NFS42_READ_PLUS_SEGMENT_SIZE (1 /* data_content4 */ + \
+ 2 /* data_info4.di_offset */ + \
+ 2 /* data_info4.di_length */)
+#define decode_read_plus_maxsz (op_decode_hdr_maxsz + \
+ 1 /* rpr_eof */ + \
+ 1 /* rpr_contents count */ + \
+ NFS42_READ_PLUS_SEGMENT_SIZE)
#define encode_seek_maxsz (op_encode_hdr_maxsz + \
encode_stateid_maxsz + \
2 /* offset */ + \
@@ -128,6 +137,14 @@
decode_putfh_maxsz + \
decode_deallocate_maxsz + \
decode_getattr_maxsz)
+#define NFS4_enc_read_plus_sz (compound_encode_hdr_maxsz + \
+ encode_sequence_maxsz + \
+ encode_putfh_maxsz + \
+ encode_read_plus_maxsz)
+#define NFS4_dec_read_plus_sz (compound_decode_hdr_maxsz + \
+ decode_sequence_maxsz + \
+ decode_putfh_maxsz + \
+ decode_read_plus_maxsz)
#define NFS4_enc_seek_sz (compound_encode_hdr_maxsz + \
encode_sequence_maxsz + \
encode_putfh_maxsz + \
@@ -252,6 +269,16 @@ static void encode_deallocate(struct xdr_stream *xdr,
encode_fallocate(xdr, args);
}
+static void encode_read_plus(struct xdr_stream *xdr,
+ const struct nfs_pgio_args *args,
+ struct compound_hdr *hdr)
+{
+ encode_op_hdr(xdr, OP_READ_PLUS, decode_read_plus_maxsz, hdr);
+ encode_nfs4_stateid(xdr, &args->stateid);
+ encode_uint64(xdr, args->offset);
+ encode_uint32(xdr, args->count);
+}
+
static void encode_seek(struct xdr_stream *xdr,
const struct nfs42_seek_args *args,
struct compound_hdr *hdr)
@@ -446,6 +473,28 @@ static void nfs4_xdr_enc_deallocate(struct rpc_rqst *req,
encode_nops(&hdr);
}
+/*
+ * Encode READ_PLUS request
+ */
+static void nfs4_xdr_enc_read_plus(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ const void *data)
+{
+ const struct nfs_pgio_args *args = data;
+ struct compound_hdr hdr = {
+ .minorversion = nfs4_xdr_minorversion(&args->seq_args),
+ };
+
+ encode_compound_hdr(xdr, req, &hdr);
+ encode_sequence(xdr, &args->seq_args, &hdr);
+ encode_putfh(xdr, args->fh, &hdr);
+ encode_read_plus(xdr, args, &hdr);
+
+ rpc_prepare_reply_pages(req, args->pages, args->pgbase,
+ args->count, hdr.replen);
+ encode_nops(&hdr);
+}
+
/*
* Encode SEEK request
*/
@@ -694,6 +743,70 @@ static int decode_deallocate(struct xdr_stream *xdr, struct nfs42_falloc_res *re
return decode_op_hdr(xdr, OP_DEALLOCATE);
}
+static int decode_read_plus_data(struct xdr_stream *xdr, struct nfs_pgio_res *res,
+ uint32_t *eof)
+{
+ uint32_t count, recvd;
+ uint64_t offset;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 8 + 4);
+ if (unlikely(!p))
+ return -EIO;
+
+ p = xdr_decode_hyper(p, &offset);
+ count = be32_to_cpup(p);
+ recvd = xdr_read_pages(xdr, count);
+ if (count > recvd) {
+ dprintk("NFS: server cheating in read reply: "
+ "count %u > recvd %u\n", count, recvd);
+ count = recvd;
+ *eof = 0;
+ }
+
+ res->count += count;
+ return 0;
+}
+
+static int decode_read_plus(struct xdr_stream *xdr, struct nfs_pgio_res *res)
+{
+ uint32_t eof, segments, type;
+ int status;
+ __be32 *p;
+
+ status = decode_op_hdr(xdr, OP_READ_PLUS);
+ if (status)
+ return status;
+
+ p = xdr_inline_decode(xdr, 4 + 4);
+ if (unlikely(!p))
+ return -EIO;
+
+ eof = be32_to_cpup(p++);
+ segments = be32_to_cpup(p++);
+ if (segments == 0)
+ goto out;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(!p))
+ return -EIO;
+
+ type = be32_to_cpup(p++);
+ if (type == NFS4_CONTENT_DATA)
+ status = decode_read_plus_data(xdr, res, &eof);
+ else
+ return -EINVAL;
+
+ if (status)
+ return status;
+ if (segments > 1)
+ eof = 0;
+
+out:
+ res->eof = eof;
+ return 0;
+}
+
static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res)
{
int status;
@@ -870,6 +983,33 @@ static int nfs4_xdr_dec_deallocate(struct rpc_rqst *rqstp,
return status;
}
+/*
+ * Decode READ_PLUS request
+ */
+static int nfs4_xdr_dec_read_plus(struct rpc_rqst *rqstp,
+ struct xdr_stream *xdr,
+ void *data)
+{
+ struct nfs_pgio_res *res = data;
+ struct compound_hdr hdr;
+ int status;
+
+ status = decode_compound_hdr(xdr, &hdr);
+ if (status)
+ goto out;
+ status = decode_sequence(xdr, &res->seq_res, rqstp);
+ if (status)
+ goto out;
+ status = decode_putfh(xdr);
+ if (status)
+ goto out;
+ status = decode_read_plus(xdr, res);
+ if (!status)
+ status = res->count;
+out:
+ return status;
+}
+
/*
* Decode SEEK request
*/
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 2e2dac29a9e9..509198eb968e 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -69,6 +69,10 @@
#include "nfs4trace.h"
+#ifdef CONFIG_NFS_V4_2
+#include "nfs42.h"
+#endif /* CONFIG_NFS_V4_2 */
+
#define NFSDBG_FACILITY NFSDBG_PROC
#define NFS4_BITMASK_SZ 3
@@ -5226,28 +5230,60 @@ static bool nfs4_read_stateid_changed(struct rpc_task *task,
return true;
}
+static bool nfs4_read_plus_not_supported(struct rpc_task *task,
+ struct nfs_pgio_header *hdr)
+{
+ struct nfs_server *server = NFS_SERVER(hdr->inode);
+ struct rpc_message *msg = &task->tk_msg;
+
+ if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
+ server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
+ server->caps &= ~NFS_CAP_READ_PLUS;
+ msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
+ rpc_restart_call_prepare(task);
+ return true;
+ }
+ return false;
+}
+
static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
{
-
dprintk("--> %s\n", __func__);
if (!nfs4_sequence_done(task, &hdr->res.seq_res))
return -EAGAIN;
if (nfs4_read_stateid_changed(task, &hdr->args))
return -EAGAIN;
+ if (nfs4_read_plus_not_supported(task, hdr))
+ return -EAGAIN;
if (task->tk_status > 0)
nfs_invalidate_atime(hdr->inode);
return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
nfs4_read_done_cb(task, hdr);
}
+#ifdef CONFIG_NFS_V4_2
+static void nfs42_read_plus_support(struct nfs_server *server, struct rpc_message *msg)
+{
+ if (server->caps & NFS_CAP_READ_PLUS)
+ msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
+ else
+ msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
+}
+#else
+static void nfs42_read_plus_support(struct nfs_server *server, struct rpc_message *msg)
+{
+ msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
+}
+#endif /* CONFIG_NFS_V4_2 */
+
static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
struct rpc_message *msg)
{
hdr->timestamp = jiffies;
if (!hdr->pgio_done_cb)
hdr->pgio_done_cb = nfs4_read_done_cb;
- msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
+ nfs42_read_plus_support(NFS_SERVER(hdr->inode), msg);
nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
}
@@ -10006,7 +10042,8 @@ static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
| NFS_CAP_SEEK
| NFS_CAP_LAYOUTSTATS
| NFS_CAP_CLONE
- | NFS_CAP_LAYOUTERROR,
+ | NFS_CAP_LAYOUTERROR
+ | NFS_CAP_READ_PLUS,
.init_client = nfs41_init_client,
.shutdown_client = nfs41_shutdown_client,
.match_stateid = nfs41_match_stateid,
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 6742646d4feb..80d9d55a48c2 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -7580,6 +7580,7 @@ const struct rpc_procinfo nfs4_procedures[] = {
PROC42(COPY_NOTIFY, enc_copy_notify, dec_copy_notify),
PROC(LOOKUPP, enc_lookupp, dec_lookupp),
PROC42(LAYOUTERROR, enc_layouterror, dec_layouterror),
+ PROC42(READ_PLUS, enc_read_plus, dec_read_plus),
};
static unsigned int nfs_version4_counts[ARRAY_SIZE(nfs4_procedures)];
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 4dba3c948932..4bf75b56758c 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -540,8 +540,8 @@ enum {
NFSPROC4_CLNT_LOOKUPP,
NFSPROC4_CLNT_LAYOUTERROR,
-
NFSPROC4_CLNT_COPY_NOTIFY,
+ NFSPROC4_CLNT_READ_PLUS,
};
/* nfs41 types */
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 465fa98258a3..11248c5a7b24 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -281,5 +281,6 @@ struct nfs_server {
#define NFS_CAP_OFFLOAD_CANCEL (1U << 25)
#define NFS_CAP_LAYOUTERROR (1U << 26)
#define NFS_CAP_COPY_NOTIFY (1U << 27)
+#define NFS_CAP_READ_PLUS (1U << 28)
#endif
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 5fd0a9ef425f..6da54d010421 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -656,7 +656,7 @@ struct nfs_pgio_args {
struct nfs_pgio_res {
struct nfs4_sequence_res seq_res;
struct nfs_fattr * fattr;
- __u32 count;
+ __u64 count;
__u32 op_status;
union {
struct {
--
2.27.0
^ permalink raw reply related [flat|nested] 11+ messages in thread* [PATCH v3 05/10] SUNRPC: Split out xdr_realign_pages() from xdr_align_pages()
2020-08-03 17:00 [PATCH v3 00/10] NFS: Add support for the v4.2 READ_PLUS operation schumaker.anna
` (3 preceding siblings ...)
2020-08-03 17:00 ` [PATCH v3 04/10] NFS: Add READ_PLUS data segment support schumaker.anna
@ 2020-08-03 17:00 ` schumaker.anna
2020-08-03 17:00 ` [PATCH v3 06/10] SUNRPC: Split out _shift_data_right_tail() schumaker.anna
` (4 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: schumaker.anna @ 2020-08-03 17:00 UTC (permalink / raw)
To: linux-nfs; +Cc: Anna.Schumaker
From: Anna Schumaker <Anna.Schumaker@Netapp.com>
I don't need the entire align pages code for READ_PLUS, so split out the
part I do need so I don't need to reimplement anything.
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
net/sunrpc/xdr.c | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 8d29450fdce5..70efb35c119e 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -1042,26 +1042,33 @@ __be32 * xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes)
}
EXPORT_SYMBOL_GPL(xdr_inline_decode);
-static unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len)
+static void xdr_realign_pages(struct xdr_stream *xdr)
{
struct xdr_buf *buf = xdr->buf;
- struct kvec *iov;
- unsigned int nwords = XDR_QUADLEN(len);
+ struct kvec *iov = buf->head;
unsigned int cur = xdr_stream_pos(xdr);
unsigned int copied, offset;
- if (xdr->nwords == 0)
- return 0;
-
/* Realign pages to current pointer position */
- iov = buf->head;
if (iov->iov_len > cur) {
offset = iov->iov_len - cur;
copied = xdr_shrink_bufhead(buf, offset);
trace_rpc_xdr_alignment(xdr, offset, copied);
xdr->nwords = XDR_QUADLEN(buf->len - cur);
}
+}
+static unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len)
+{
+ struct xdr_buf *buf = xdr->buf;
+ unsigned int nwords = XDR_QUADLEN(len);
+ unsigned int cur = xdr_stream_pos(xdr);
+ unsigned int copied, offset;
+
+ if (xdr->nwords == 0)
+ return 0;
+
+ xdr_realign_pages(xdr);
if (nwords > xdr->nwords) {
nwords = xdr->nwords;
len = nwords << 2;
--
2.27.0
^ permalink raw reply related [flat|nested] 11+ messages in thread* [PATCH v3 06/10] SUNRPC: Split out _shift_data_right_tail()
2020-08-03 17:00 [PATCH v3 00/10] NFS: Add support for the v4.2 READ_PLUS operation schumaker.anna
` (4 preceding siblings ...)
2020-08-03 17:00 ` [PATCH v3 05/10] SUNRPC: Split out xdr_realign_pages() from xdr_align_pages() schumaker.anna
@ 2020-08-03 17:00 ` schumaker.anna
2020-08-03 17:00 ` [PATCH v3 07/10] SUNRPC: Add the ability to expand holes in data pages schumaker.anna
` (3 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: schumaker.anna @ 2020-08-03 17:00 UTC (permalink / raw)
To: linux-nfs; +Cc: Anna.Schumaker
From: Anna Schumaker <Anna.Schumaker@Netapp.com>
xdr_shrink_pagelen() is very similar to what we need for hole expansion,
so split out the common code into its own function that can be used by
both functions.
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
net/sunrpc/xdr.c | 68 +++++++++++++++++++++++++++++-------------------
1 file changed, 41 insertions(+), 27 deletions(-)
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 70efb35c119e..d8c9555c6f2b 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -266,6 +266,46 @@ _shift_data_right_pages(struct page **pages, size_t pgto_base,
} while ((len -= copy) != 0);
}
+static unsigned int
+_shift_data_right_tail(struct xdr_buf *buf, unsigned int pgfrom, size_t len)
+{
+ struct kvec *tail = buf->tail;
+ unsigned int tailbuf_len;
+ unsigned int result = 0;
+ size_t copy;
+
+ tailbuf_len = buf->buflen - buf->head->iov_len - buf->page_len;
+
+ /* Shift the tail first */
+ if (tailbuf_len != 0) {
+ unsigned int free_space = tailbuf_len - tail->iov_len;
+
+ if (len < free_space)
+ free_space = len;
+ if (len > free_space)
+ len = free_space;
+
+ tail->iov_len += free_space;
+ copy = len;
+
+ if (tail->iov_len > len) {
+ char *p = (char *)tail->iov_base + len;
+ memmove(p, tail->iov_base, tail->iov_len - free_space);
+ result += tail->iov_len - free_space;
+ } else
+ copy = tail->iov_len;
+
+ /* Copy from the inlined pages into the tail */
+ _copy_from_pages((char *)tail->iov_base,
+ buf->pages,
+ buf->page_base + pgfrom,
+ copy);
+ result += copy;
+ }
+
+ return result;
+}
+
/**
* _copy_to_pages
* @pages: array of pages
@@ -446,39 +486,13 @@ xdr_shrink_bufhead(struct xdr_buf *buf, size_t len)
static unsigned int
xdr_shrink_pagelen(struct xdr_buf *buf, size_t len)
{
- struct kvec *tail;
- size_t copy;
unsigned int pglen = buf->page_len;
- unsigned int tailbuf_len;
unsigned int result;
- result = 0;
- tail = buf->tail;
if (len > buf->page_len)
len = buf-> page_len;
- tailbuf_len = buf->buflen - buf->head->iov_len - buf->page_len;
- /* Shift the tail first */
- if (tailbuf_len != 0) {
- unsigned int free_space = tailbuf_len - tail->iov_len;
-
- if (len < free_space)
- free_space = len;
- tail->iov_len += free_space;
-
- copy = len;
- if (tail->iov_len > len) {
- char *p = (char *)tail->iov_base + len;
- memmove(p, tail->iov_base, tail->iov_len - len);
- result += tail->iov_len - len;
- } else
- copy = tail->iov_len;
- /* Copy from the inlined pages into the tail */
- _copy_from_pages((char *)tail->iov_base,
- buf->pages, buf->page_base + pglen - len,
- copy);
- result += copy;
- }
+ result = _shift_data_right_tail(buf, pglen - len, len);
buf->page_len -= len;
buf->buflen -= len;
/* Have we truncated the message? */
--
2.27.0
^ permalink raw reply related [flat|nested] 11+ messages in thread* [PATCH v3 07/10] SUNRPC: Add the ability to expand holes in data pages
2020-08-03 17:00 [PATCH v3 00/10] NFS: Add support for the v4.2 READ_PLUS operation schumaker.anna
` (5 preceding siblings ...)
2020-08-03 17:00 ` [PATCH v3 06/10] SUNRPC: Split out _shift_data_right_tail() schumaker.anna
@ 2020-08-03 17:00 ` schumaker.anna
2020-08-03 17:00 ` [PATCH v3 08/10] NFS: Add READ_PLUS hole segment decoding schumaker.anna
` (2 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: schumaker.anna @ 2020-08-03 17:00 UTC (permalink / raw)
To: linux-nfs; +Cc: Anna.Schumaker
From: Anna Schumaker <Anna.Schumaker@Netapp.com>
This patch adds the ability to "read a hole" into a set of XDR data
pages by taking the following steps:
1) Shift all data after the current xdr->p to the right, possibly into
the tail,
2) Zero the specified range, and
3) Update xdr->p to point beyond the hole.
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
include/linux/sunrpc/xdr.h | 1 +
net/sunrpc/xdr.c | 73 ++++++++++++++++++++++++++++++++++++++
2 files changed, 74 insertions(+)
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index 40318ff97c83..de1f301f4864 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -252,6 +252,7 @@ extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
+extern uint64_t xdr_expand_hole(struct xdr_stream *, uint64_t, uint64_t);
/**
* xdr_stream_remaining - Return the number of bytes remaining in the stream
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index d8c9555c6f2b..24baf052e6e6 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -390,6 +390,42 @@ _copy_from_pages(char *p, struct page **pages, size_t pgbase, size_t len)
}
EXPORT_SYMBOL_GPL(_copy_from_pages);
+/**
+ * _zero_pages
+ * @pages: array of pages
+ * @pgbase: beginning page vector address
+ * @len: length
+ */
+static void
+_zero_pages(struct page **pages, size_t pgbase, size_t len)
+{
+ struct page **page;
+ char *vpage;
+ size_t zero;
+
+ page = pages + (pgbase >> PAGE_SHIFT);
+ pgbase &= ~PAGE_MASK;
+
+ do {
+ zero = PAGE_SIZE - pgbase;
+ if (zero > len)
+ zero = len;
+
+ vpage = kmap_atomic(*page);
+ memset(vpage + pgbase, 0, zero);
+ kunmap_atomic(vpage);
+
+ pgbase += zero;
+ if (pgbase == PAGE_SIZE) {
+ flush_dcache_page(*page);
+ pgbase = 0;
+ page++;
+ }
+
+ } while ((len -= zero) != 0);
+ flush_dcache_page(*page);
+}
+
/**
* xdr_shrink_bufhead
* @buf: xdr_buf
@@ -1141,6 +1177,43 @@ unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
}
EXPORT_SYMBOL_GPL(xdr_read_pages);
+uint64_t xdr_expand_hole(struct xdr_stream *xdr, uint64_t offset, uint64_t length)
+{
+ struct xdr_buf *buf = xdr->buf;
+ unsigned int bytes;
+ unsigned int from;
+ unsigned int truncated = 0;
+
+ if ((offset + length) < offset ||
+ (offset + length) > buf->page_len)
+ length = buf->page_len - offset;
+
+ xdr_realign_pages(xdr);
+ from = xdr_page_pos(xdr);
+ bytes = xdr->nwords << 2;
+
+ if (offset + length + bytes > buf->page_len) {
+ unsigned int shift = (offset + length + bytes) - buf->page_len;
+ unsigned int res = _shift_data_right_tail(buf, from + bytes - shift, shift);
+ truncated = shift - res;
+ xdr->nwords -= XDR_QUADLEN(truncated);
+ bytes -= shift;
+ }
+
+ /* Now move the page data over and zero pages */
+ if (bytes > 0)
+ _shift_data_right_pages(buf->pages,
+ buf->page_base + offset + length,
+ buf->page_base + from,
+ bytes);
+ _zero_pages(buf->pages, buf->page_base + offset, length);
+
+ buf->len += length - (from - offset) - truncated;
+ xdr_set_page(xdr, offset + length, PAGE_SIZE);
+ return length;
+}
+EXPORT_SYMBOL_GPL(xdr_expand_hole);
+
/**
* xdr_enter_page - decode data from the XDR page
* @xdr: pointer to xdr_stream struct
--
2.27.0
^ permalink raw reply related [flat|nested] 11+ messages in thread* [PATCH v3 08/10] NFS: Add READ_PLUS hole segment decoding
2020-08-03 17:00 [PATCH v3 00/10] NFS: Add support for the v4.2 READ_PLUS operation schumaker.anna
` (6 preceding siblings ...)
2020-08-03 17:00 ` [PATCH v3 07/10] SUNRPC: Add the ability to expand holes in data pages schumaker.anna
@ 2020-08-03 17:00 ` schumaker.anna
2020-08-03 17:00 ` [PATCH v3 09/10] SUNRPC: Add an xdr_align_data() function schumaker.anna
2020-08-03 17:00 ` [PATCH v3 10/10] NFS: Decode a full READ_PLUS reply schumaker.anna
9 siblings, 0 replies; 11+ messages in thread
From: schumaker.anna @ 2020-08-03 17:00 UTC (permalink / raw)
To: linux-nfs; +Cc: Anna.Schumaker
From: Anna Schumaker <Anna.Schumaker@Netapp.com>
We keep things simple for now by only decoding a single hole or data
segment returned by the server, even if they returned more to us.
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
fs/nfs/nfs42xdr.c | 27 ++++++++++++++++++++++++++-
1 file changed, 26 insertions(+), 1 deletion(-)
diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c
index 9a1e18295e55..791e90353bc2 100644
--- a/fs/nfs/nfs42xdr.c
+++ b/fs/nfs/nfs42xdr.c
@@ -53,7 +53,7 @@
#define decode_read_plus_maxsz (op_decode_hdr_maxsz + \
1 /* rpr_eof */ + \
1 /* rpr_contents count */ + \
- NFS42_READ_PLUS_SEGMENT_SIZE)
+ 2 * NFS42_READ_PLUS_SEGMENT_SIZE)
#define encode_seek_maxsz (op_encode_hdr_maxsz + \
encode_stateid_maxsz + \
2 /* offset */ + \
@@ -768,6 +768,29 @@ static int decode_read_plus_data(struct xdr_stream *xdr, struct nfs_pgio_res *re
return 0;
}
+static int decode_read_plus_hole(struct xdr_stream *xdr, struct nfs_pgio_res *res,
+ uint32_t *eof)
+{
+ uint64_t offset, length, recvd;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 8 + 8);
+ if (unlikely(!p))
+ return -EIO;
+
+ p = xdr_decode_hyper(p, &offset);
+ p = xdr_decode_hyper(p, &length);
+
+ recvd = xdr_expand_hole(xdr, 0, length);
+ if (recvd < length) {
+ *eof = 0;
+ length = recvd;
+ }
+
+ res->count += length;
+ return 0;
+}
+
static int decode_read_plus(struct xdr_stream *xdr, struct nfs_pgio_res *res)
{
uint32_t eof, segments, type;
@@ -794,6 +817,8 @@ static int decode_read_plus(struct xdr_stream *xdr, struct nfs_pgio_res *res)
type = be32_to_cpup(p++);
if (type == NFS4_CONTENT_DATA)
status = decode_read_plus_data(xdr, res, &eof);
+ else if (type == NFS4_CONTENT_HOLE)
+ status = decode_read_plus_hole(xdr, res, &eof);
else
return -EINVAL;
--
2.27.0
^ permalink raw reply related [flat|nested] 11+ messages in thread* [PATCH v3 09/10] SUNRPC: Add an xdr_align_data() function
2020-08-03 17:00 [PATCH v3 00/10] NFS: Add support for the v4.2 READ_PLUS operation schumaker.anna
` (7 preceding siblings ...)
2020-08-03 17:00 ` [PATCH v3 08/10] NFS: Add READ_PLUS hole segment decoding schumaker.anna
@ 2020-08-03 17:00 ` schumaker.anna
2020-08-03 17:00 ` [PATCH v3 10/10] NFS: Decode a full READ_PLUS reply schumaker.anna
9 siblings, 0 replies; 11+ messages in thread
From: schumaker.anna @ 2020-08-03 17:00 UTC (permalink / raw)
To: linux-nfs; +Cc: Anna.Schumaker
From: Anna Schumaker <Anna.Schumaker@Netapp.com>
For now, this function simply aligns the data at the beginning of the
pages. This can eventually be expanded to shift data to the correct
offsets when we're ready.
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
include/linux/sunrpc/xdr.h | 3 +
net/sunrpc/xdr.c | 120 ++++++++++++++++++++++++++++++++++++-
2 files changed, 122 insertions(+), 1 deletion(-)
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index de1f301f4864..b05a2d6611c5 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -206,6 +206,8 @@ extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
struct xdr_array2_desc *desc);
extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase,
size_t len);
+extern void _copy_to_pages(struct page **pages, size_t pgbase, const char *p,
+ size_t len);
/*
* Provide some simple tools for XDR buffer overflow-checking etc.
@@ -252,6 +254,7 @@ extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
+extern uint64_t xdr_align_data(struct xdr_stream *, uint64_t, uint32_t);
extern uint64_t xdr_expand_hole(struct xdr_stream *, uint64_t, uint64_t);
/**
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 24baf052e6e6..f42da5051f36 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -201,6 +201,88 @@ EXPORT_SYMBOL_GPL(xdr_inline_pages);
* Helper routines for doing 'memmove' like operations on a struct xdr_buf
*/
+/**
+ * _shift_data_left_pages
+ * @pages: vector of pages containing both the source and dest memory area.
+ * @pgto_base: page vector address of destination
+ * @pgfrom_base: page vector address of source
+ * @len: number of bytes to copy
+ *
+ * Note: the addresses pgto_base and pgfrom_base are both calculated in
+ * the same way:
+ * if a memory area starts at byte 'base' in page 'pages[i]',
+ * then its address is given as (i << PAGE_CACHE_SHIFT) + base
+ * Alse note: pgto_base must be < pgfrom_base, but the memory areas
+ * they point to may overlap.
+ */
+static void
+_shift_data_left_pages(struct page **pages, size_t pgto_base,
+ size_t pgfrom_base, size_t len)
+{
+ struct page **pgfrom, **pgto;
+ char *vfrom, *vto;
+ size_t copy;
+
+ BUG_ON(pgfrom_base <= pgto_base);
+
+ pgto = pages + (pgto_base >> PAGE_SHIFT);
+ pgfrom = pages + (pgfrom_base >> PAGE_SHIFT);
+
+ pgto_base &= ~PAGE_MASK;
+ pgfrom_base &= ~PAGE_MASK;
+
+ do {
+ if (pgto_base >= PAGE_SIZE) {
+ pgto_base = 0;
+ pgto++;
+ }
+ if (pgfrom_base >= PAGE_SIZE){
+ pgfrom_base = 0;
+ pgfrom++;
+ }
+
+ copy = len;
+ if (copy > (PAGE_SIZE - pgto_base))
+ copy = PAGE_SIZE - pgto_base;
+ if (copy > (PAGE_SIZE - pgfrom_base))
+ copy = PAGE_SIZE - pgfrom_base;
+
+ vto = kmap_atomic(*pgto);
+ if (*pgto != *pgfrom) {
+ vfrom = kmap_atomic(*pgfrom);
+ memcpy(vto + pgto_base, vfrom + pgfrom_base, copy);
+ kunmap_atomic(vfrom);
+ } else
+ memmove(vto + pgto_base, vto + pgfrom_base, copy);
+ flush_dcache_page(*pgto);
+ kunmap_atomic(vto);
+
+ pgto_base += copy;
+ pgfrom_base += copy;
+
+ } while ((len -= copy) != 0);
+}
+
+static void
+_shift_data_left_tail(struct xdr_buf *buf, unsigned int pgto, size_t len)
+{
+ struct kvec *tail = buf->tail;
+
+ if (len > tail->iov_len)
+ len = tail->iov_len;
+
+ _copy_to_pages(buf->pages,
+ buf->page_base + pgto,
+ (char *)tail->iov_base,
+ len);
+ tail->iov_len -= len;
+
+ if (tail->iov_len > 0)
+ memmove((char *)tail->iov_base,
+ tail->iov_base + len,
+ tail->iov_len);
+}
+
/**
* _shift_data_right_pages
* @pages: vector of pages containing both the source and dest memory area.
@@ -316,7 +398,7 @@ _shift_data_right_tail(struct xdr_buf *buf, unsigned int pgfrom, size_t len)
* Copies data from an arbitrary memory location into an array of pages
* The copy is assumed to be non-overlapping.
*/
-static void
+void
_copy_to_pages(struct page **pages, size_t pgbase, const char *p, size_t len)
{
struct page **pgto;
@@ -1177,6 +1259,42 @@ unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
}
EXPORT_SYMBOL_GPL(xdr_read_pages);
+uint64_t xdr_align_data(struct xdr_stream *xdr, uint64_t offset, uint32_t length)
+{
+ struct xdr_buf *buf = xdr->buf;
+ unsigned int from, bytes;
+ unsigned int shift = 0;
+
+ if ((offset + length) < offset ||
+ (offset + length) > buf->page_len)
+ length = buf->page_len - offset;
+
+ xdr_realign_pages(xdr);
+ from = xdr_page_pos(xdr);
+ bytes = xdr->nwords << 2;
+ if (length < bytes)
+ bytes = length;
+
+ /* Move page data to the left */
+ if (from > offset) {
+ shift = min_t(unsigned int, bytes, buf->page_len - from);
+ _shift_data_left_pages(buf->pages,
+ buf->page_base + offset,
+ buf->page_base + from,
+ shift);
+ bytes -= shift;
+
+ /* Move tail data into the pages, if necessary */
+ if (bytes > 0)
+ _shift_data_left_tail(buf, offset + shift, bytes);
+ }
+
+ xdr->nwords -= XDR_QUADLEN(length);
+ xdr_set_page(xdr, from + length, PAGE_SIZE);
+ return length;
+}
+EXPORT_SYMBOL_GPL(xdr_align_data);
+
uint64_t xdr_expand_hole(struct xdr_stream *xdr, uint64_t offset, uint64_t length)
{
struct xdr_buf *buf = xdr->buf;
--
2.27.0
^ permalink raw reply related [flat|nested] 11+ messages in thread* [PATCH v3 10/10] NFS: Decode a full READ_PLUS reply
2020-08-03 17:00 [PATCH v3 00/10] NFS: Add support for the v4.2 READ_PLUS operation schumaker.anna
` (8 preceding siblings ...)
2020-08-03 17:00 ` [PATCH v3 09/10] SUNRPC: Add an xdr_align_data() function schumaker.anna
@ 2020-08-03 17:00 ` schumaker.anna
9 siblings, 0 replies; 11+ messages in thread
From: schumaker.anna @ 2020-08-03 17:00 UTC (permalink / raw)
To: linux-nfs; +Cc: Anna.Schumaker
From: Anna Schumaker <Anna.Schumaker@Netapp.com>
Decode multiple hole and data segments sent by the server, placing
everything directly where they need to go in the xdr pages.
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
fs/nfs/nfs42xdr.c | 50 +++++++++++++++++++++++------------------------
1 file changed, 24 insertions(+), 26 deletions(-)
diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c
index 791e90353bc2..c31c6fadee19 100644
--- a/fs/nfs/nfs42xdr.c
+++ b/fs/nfs/nfs42xdr.c
@@ -756,16 +756,15 @@ static int decode_read_plus_data(struct xdr_stream *xdr, struct nfs_pgio_res *re
p = xdr_decode_hyper(p, &offset);
count = be32_to_cpup(p);
- recvd = xdr_read_pages(xdr, count);
+ recvd = xdr_align_data(xdr, res->count, count);
if (count > recvd) {
dprintk("NFS: server cheating in read reply: "
"count %u > recvd %u\n", count, recvd);
- count = recvd;
*eof = 0;
}
- res->count += count;
- return 0;
+ res->count += recvd;
+ return count - recvd;
}
static int decode_read_plus_hole(struct xdr_stream *xdr, struct nfs_pgio_res *res,
@@ -780,21 +779,18 @@ static int decode_read_plus_hole(struct xdr_stream *xdr, struct nfs_pgio_res *re
p = xdr_decode_hyper(p, &offset);
p = xdr_decode_hyper(p, &length);
-
- recvd = xdr_expand_hole(xdr, 0, length);
- if (recvd < length) {
+ recvd = xdr_expand_hole(xdr, res->count, length);
+ if (recvd < length)
*eof = 0;
- length = recvd;
- }
- res->count += length;
- return 0;
+ res->count += recvd;
+ return length - recvd;
}
static int decode_read_plus(struct xdr_stream *xdr, struct nfs_pgio_res *res)
{
uint32_t eof, segments, type;
- int status;
+ int status, i;
__be32 *p;
status = decode_op_hdr(xdr, OP_READ_PLUS);
@@ -810,22 +806,24 @@ static int decode_read_plus(struct xdr_stream *xdr, struct nfs_pgio_res *res)
if (segments == 0)
goto out;
- p = xdr_inline_decode(xdr, 4);
- if (unlikely(!p))
- return -EIO;
+ for (i = 0; i < segments; i++) {
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(!p))
+ return -EIO;
- type = be32_to_cpup(p++);
- if (type == NFS4_CONTENT_DATA)
- status = decode_read_plus_data(xdr, res, &eof);
- else if (type == NFS4_CONTENT_HOLE)
- status = decode_read_plus_hole(xdr, res, &eof);
- else
- return -EINVAL;
+ type = be32_to_cpup(p++);
+ if (type == NFS4_CONTENT_DATA)
+ status = decode_read_plus_data(xdr, res, &eof);
+ else if (type == NFS4_CONTENT_HOLE)
+ status = decode_read_plus_hole(xdr, res, &eof);
+ else
+ return -EINVAL;
- if (status)
- return status;
- if (segments > 1)
- eof = 0;
+ if (status < 0)
+ return status;
+ if (status > 0)
+ break;
+ }
out:
res->eof = eof;
--
2.27.0
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