This patch adds support for the NFS v4.2 operation SEEK.
I think nfs4proc.c and nfs4xdr.c have grown out of control, and I would like
to avoid adding new functions to these files unless absolutely necessary.
Therefore, I created nfs42proc.c and nfs42xdr.h in an attempt to separate
out the new code.
Changes is v2:
- Remove dots from filenames to keep Christoph happy :)
This patch and the corresponding server changes are available in the [seek]
branch of:
git://git.linux-nfs.org/projects/anna/linux-nfs.git
Questions? Comments? Thoughts?
Anna
Anna Schumaker (1):
NFS: Implement SEEK
fs/nfs/Makefile | 1 +
fs/nfs/inode.c | 2 +
fs/nfs/nfs42.h | 14 +++++++
fs/nfs/nfs42proc.c | 39 +++++++++++++++++++
fs/nfs/nfs42xdr.h | 98 +++++++++++++++++++++++++++++++++++++++++++++++
fs/nfs/nfs4_fs.h | 7 ++++
fs/nfs/nfs4client.c | 2 +
fs/nfs/nfs4file.c | 68 ++++++++++++++++++++++++++++++++
fs/nfs/nfs4proc.c | 1 -
fs/nfs/nfs4xdr.c | 7 ++++
fs/nfsd/nfs4proc.c | 2 +-
include/linux/nfs4.h | 3 ++
include/linux/nfs_fs_sb.h | 1 +
include/linux/nfs_xdr.h | 19 +++++++++
14 files changed, 262 insertions(+), 2 deletions(-)
create mode 100644 fs/nfs/nfs42.h
create mode 100644 fs/nfs/nfs42proc.c
create mode 100644 fs/nfs/nfs42xdr.h
--
2.1.0
From: Anna Schumaker <[email protected]>
The SEEK operation is used when an application makes an lseek call with
either the SEEK_HOLE or SEEK_DATA flags set. I fall back on
nfs_file_llseek() if the server does not have SEEK support.
Signed-off-by: Anna Schumaker <[email protected]>
---
fs/nfs/Makefile | 1 +
fs/nfs/inode.c | 2 +
fs/nfs/nfs42.h | 14 +++++++
fs/nfs/nfs42proc.c | 39 +++++++++++++++++++
fs/nfs/nfs42xdr.h | 98 +++++++++++++++++++++++++++++++++++++++++++++++
fs/nfs/nfs4_fs.h | 7 ++++
fs/nfs/nfs4client.c | 2 +
fs/nfs/nfs4file.c | 68 ++++++++++++++++++++++++++++++++
fs/nfs/nfs4proc.c | 1 -
fs/nfs/nfs4xdr.c | 7 ++++
fs/nfsd/nfs4proc.c | 2 +-
include/linux/nfs4.h | 3 ++
include/linux/nfs_fs_sb.h | 1 +
include/linux/nfs_xdr.h | 19 +++++++++
14 files changed, 262 insertions(+), 2 deletions(-)
create mode 100644 fs/nfs/nfs42.h
create mode 100644 fs/nfs/nfs42proc.c
create mode 100644 fs/nfs/nfs42xdr.h
diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
index 4782e08..04cb830 100644
--- a/fs/nfs/Makefile
+++ b/fs/nfs/Makefile
@@ -28,6 +28,7 @@ nfsv4-y := nfs4proc.o nfs4xdr.o nfs4state.o nfs4renewd.o nfs4super.o nfs4file.o
nfsv4-$(CONFIG_NFS_USE_LEGACY_DNS) += cache_lib.o
nfsv4-$(CONFIG_SYSCTL) += nfs4sysctl.o
nfsv4-$(CONFIG_NFS_V4_1) += pnfs.o pnfs_dev.o
+nfsv4-$(CONFIG_NFS_V4_2) += nfs42proc.o
obj-$(CONFIG_PNFS_FILE_LAYOUT) += filelayout/
obj-$(CONFIG_PNFS_OBJLAYOUT) += objlayout/
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 577a36f..56d073e 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -716,6 +716,7 @@ struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
kfree(new);
return res;
}
+EXPORT_SYMBOL_GPL(nfs_get_lock_context);
void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
{
@@ -728,6 +729,7 @@ void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
spin_unlock(&inode->i_lock);
kfree(l_ctx);
}
+EXPORT_SYMBOL_GPL(nfs_put_lock_context);
/**
* nfs_close_context - Common close_context() routine NFSv2/v3
diff --git a/fs/nfs/nfs42.h b/fs/nfs/nfs42.h
new file mode 100644
index 0000000..9eecdf2
--- /dev/null
+++ b/fs/nfs/nfs42.h
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp>
+ */
+
+#ifndef __LINUX_FS_NFS_NFS4_2_H
+#define __LINUX_FS_NFS_NFS4_2_H
+
+/* nfs4.2proc.c */
+loff_t nfs42_proc_llseek(struct inode *, nfs4_stateid *, loff_t, int);
+
+/* nfs4.2xdr.h */
+extern struct rpc_procinfo nfs4_2_procedures[];
+
+#endif /* __LINUX_FS_NFS_NFS4_2_H */
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
new file mode 100644
index 0000000..4c0703f
--- /dev/null
+++ b/fs/nfs/nfs42proc.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp>
+ */
+#include <linux/fs.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/nfs.h>
+#include <linux/nfs3.h>
+#include <linux/nfs4.h>
+#include <linux/nfs_xdr.h>
+#include <linux/nfs_fs.h>
+#include "nfs4_fs.h"
+#include "nfs42.h"
+
+
+loff_t nfs42_proc_llseek(struct inode *inode, nfs4_stateid *stateid,
+ loff_t offset, int whence)
+{
+ struct nfs42_seek_args args = {
+ .sa_fh = NFS_FH(inode),
+ .sa_stateid = stateid,
+ .sa_offset = offset,
+ .sa_what = (whence == SEEK_HOLE) ?
+ NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
+ };
+ struct nfs42_seek_res res;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+ struct nfs_server *server = NFS_SERVER(inode);
+ int status;
+
+ status = nfs4_call_sync(server->client, server, &msg,
+ &args.seq_args, &res.seq_res, 0);
+ if (status)
+ return status;
+ return res.sr_offset;
+}
diff --git a/fs/nfs/nfs42xdr.h b/fs/nfs/nfs42xdr.h
new file mode 100644
index 0000000..a30cb3a
--- /dev/null
+++ b/fs/nfs/nfs42xdr.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp>
+ */
+#ifndef __LINUX_FS_NFS_NFS4_2XDR_H
+#define __LINUX_FS_NFS_NFS4_2XDR_H
+
+#define encode_seek_maxsz (op_encode_hdr_maxsz + \
+ XDR_QUADLEN(NFS4_STATEID_SIZE) + \
+ 2 /* offset */ + \
+ 1 /* whence */)
+#define decode_seek_maxsz (op_decode_hdr_maxsz + \
+ 1 /* eof */ + \
+ 1 /* whence */ + \
+ 2 /* offset */ + \
+ 2 /* length */)
+
+#define NFS4_enc_seek_sz (compound_encode_hdr_maxsz + \
+ encode_putfh_maxsz + \
+ encode_seek_maxsz)
+#define NFS4_dec_seek_sz (compound_decode_hdr_maxsz + \
+ decode_putfh_maxsz + \
+ decode_seek_maxsz)
+
+
+static void encode_seek(struct xdr_stream *xdr,
+ struct nfs42_seek_args *args,
+ struct compound_hdr *hdr)
+{
+ encode_op_hdr(xdr, OP_SEEK, decode_seek_maxsz, hdr);
+ encode_nfs4_stateid(xdr, args->sa_stateid);
+ encode_uint64(xdr, args->sa_offset);
+ encode_uint32(xdr, args->sa_what);
+}
+
+/*
+ * Encode SEEK request
+ */
+static void nfs4_xdr_enc_seek(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ struct nfs42_seek_args *args)
+{
+ 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->sa_fh, &hdr);
+ encode_seek(xdr, args, &hdr);
+ encode_nops(&hdr);
+}
+
+static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res)
+{
+ int status;
+ __be32 *p;
+
+ status = decode_op_hdr(xdr, OP_SEEK);
+ if (status)
+ return status;
+
+ p = xdr_inline_decode(xdr, 12);
+ if (unlikely(!p))
+ goto out_overflow;
+
+ res->sr_eof = be32_to_cpup(p++);
+ p = xdr_decode_hyper(p, &res->sr_offset);
+ return 0;
+
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
+/*
+ * Decode SEEK request
+ */
+static int nfs4_xdr_dec_seek(struct rpc_rqst *rqstp,
+ struct xdr_stream *xdr,
+ struct nfs42_seek_res *res)
+{
+ 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_seek(xdr, res);
+out:
+ return status;
+}
+#endif /* __LINUX_FS_NFS_NFS4_2XDR_H */
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 92193ed..ec1078f 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -227,6 +227,9 @@ int nfs4_replace_transport(struct nfs_server *server,
const struct nfs4_fs_locations *locations);
/* nfs4proc.c */
+extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
+ struct rpc_message *, struct nfs4_sequence_args *,
+ struct nfs4_sequence_res *, int);
extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
@@ -364,6 +367,10 @@ nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
}
#endif /* CONFIG_NFS_V4_1 */
+#ifdef CONFIG_NFS_V4_2
+loff_t nfs42_proc_llseek(struct inode *, nfs4_stateid *, loff_t, int);
+#endif /* CONFIG_NFS_V4_2 */
+
extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
extern const u32 nfs4_fattr_bitmap[3];
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 53e435a..f914797 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -931,6 +931,8 @@ static int nfs4_server_common_setup(struct nfs_server *server,
server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
server->caps |= NFS_CAP_UIDGID_NOMAP;
+ if (server->nfs_client->cl_minorversion >= 2)
+ server->caps |= NFS_CAP_SEEK;
/* Probe the root fh to retrieve its FSID and filehandle */
error = nfs4_get_rootfh(server, mntfh, auth_probe);
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index a816f06..6702f99 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -8,6 +8,10 @@
#include "fscache.h"
#include "pnfs.h"
+#ifdef CONFIG_NFS_V4_2
+#include "nfs42.h"
+#endif
+
#define NFSDBG_FACILITY NFSDBG_FILE
static int
@@ -115,8 +119,72 @@ nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
return ret;
}
+#ifdef CONFIG_NFS_V4_2
+static int nfs42_select_stateid(struct file *file, nfs4_stateid *stateid, fmode_t mode)
+{
+ struct nfs_open_context *open;
+ struct nfs_lock_context *lock;
+ int ret;
+
+ open = nfs_file_open_context(file);
+ if (!open)
+ return -EBADF;
+
+ lock = nfs_get_lock_context(open);
+ if (IS_ERR(lock))
+ return PTR_ERR(lock);
+
+ ret = nfs4_set_rw_stateid(stateid, open, lock, mode);
+
+ if (lock)
+ nfs_put_lock_context(lock);
+ return ret;
+}
+
+static loff_t nfs42_file_llseek(struct file *filep, loff_t offset, int whence)
+{
+ struct inode *inode = file_inode(filep);
+ nfs4_stateid stateid;
+ loff_t pos;
+ int err;
+
+ err = nfs42_select_stateid(filep, &stateid, FMODE_READ | FMODE_WRITE);
+ if (err < 0)
+ return err;
+
+ nfs_wb_all(inode);
+ pos = nfs42_proc_llseek(inode, &stateid, offset, whence);
+ if (pos < 0)
+ return pos;
+ return vfs_setpos(filep, pos, inode->i_sb->s_maxbytes);
+}
+
+static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
+{
+ struct nfs_server *server = NFS_SERVER(file_inode(filep));
+ loff_t ret;
+
+ switch (whence) {
+ case SEEK_HOLE:
+ case SEEK_DATA:
+ if (server->caps & NFS_CAP_SEEK) {
+ ret = nfs42_file_llseek(filep, offset, whence);
+ if (ret != -ENOTSUPP)
+ return ret;
+ server->caps &= ~NFS_CAP_SEEK;
+ }
+ default:
+ return nfs_file_llseek(filep, offset, whence);
+ }
+}
+#endif /* CONFIG_NFS_V4_2 */
+
const struct file_operations nfs4_file_operations = {
+#ifdef CONFIG_NFS_V4_2
+ .llseek = nfs4_file_llseek,
+#else
.llseek = nfs_file_llseek,
+#endif
.read = new_sync_read,
.write = new_sync_write,
.read_iter = nfs_file_read,
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 18eb31c..bc8b7e4 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -875,7 +875,6 @@ static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
return ret;
}
-static
int nfs4_call_sync(struct rpc_clnt *clnt,
struct nfs_server *server,
struct rpc_message *msg,
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index e13b59d..6b94428 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -7427,6 +7427,10 @@ nfs4_stat_to_errno(int stat)
return -stat;
}
+#if defined(CONFIG_NFS_V4_2)
+#include "nfs42xdr.h"
+#endif /* CONFIG_NFS_V4_2 */
+
#define PROC(proc, argtype, restype) \
[NFSPROC4_CLNT_##proc] = { \
.p_proc = NFSPROC4_COMPOUND, \
@@ -7495,6 +7499,9 @@ struct rpc_procinfo nfs4_procedures[] = {
enc_bind_conn_to_session, dec_bind_conn_to_session),
PROC(DESTROY_CLIENTID, enc_destroy_clientid, dec_destroy_clientid),
#endif /* CONFIG_NFS_V4_1 */
+#if defined(CONFIG_NFS_V4_2)
+ PROC(SEEK, enc_seek, dec_seek),
+#endif /* CONFIG_NFS_V4_2 */
};
const struct rpc_version nfs_version4 = {
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index aed5b88..9fd2b78 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1018,7 +1018,7 @@ nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_seek *seek)
{
struct file *file;
- __be32 status = nfs_ok;
+ __be32 status;
status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
&seek->seek_stateid,
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 026b0c0..356acc2 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -487,6 +487,9 @@ enum {
NFSPROC4_CLNT_GETDEVICELIST,
NFSPROC4_CLNT_BIND_CONN_TO_SESSION,
NFSPROC4_CLNT_DESTROY_CLIENTID,
+
+ /* nfs42 */
+ NFSPROC4_CLNT_SEEK,
};
/* nfs41 types */
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 922be2e..a32ba0d 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -230,5 +230,6 @@ struct nfs_server {
#define NFS_CAP_STATEID_NFSV41 (1U << 16)
#define NFS_CAP_ATOMIC_OPEN_V1 (1U << 17)
#define NFS_CAP_SECURITY_LABEL (1U << 18)
+#define NFS_CAP_SEEK (1U << 19)
#endif
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 0040629..9724257 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1239,6 +1239,25 @@ struct pnfs_ds_commit_info {
#endif /* CONFIG_NFS_V4_1 */
+#ifdef CONFIG_NFS_V4_2
+struct nfs42_seek_args {
+ struct nfs4_sequence_args seq_args;
+
+ struct nfs_fh *sa_fh;
+ nfs4_stateid *sa_stateid;
+ u64 sa_offset;
+ u32 sa_what;
+};
+
+struct nfs42_seek_res {
+ struct nfs4_sequence_res seq_res;
+ unsigned int status;
+
+ u32 sr_eof;
+ u64 sr_offset;
+};
+#endif
+
struct nfs_page;
#define NFS_PAGEVEC_SIZE (8U)
--
2.1.0
This seems to depend on the server patch adding the constants to
include/linux/nfs4.h, right?
> diff --git a/fs/nfs/nfs42xdr.h b/fs/nfs/nfs42xdr.h
> new file mode 100644
> index 0000000..a30cb3a
> --- /dev/null
> +++ b/fs/nfs/nfs42xdr.h
> @@ -0,0 +1,98 @@
> +/*
> + * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp>
Netapp.com?
> + __be32 *p;
> +
> + status = decode_op_hdr(xdr, OP_SEEK);
> + if (status)
> + return status;
> +
> + p = xdr_inline_decode(xdr, 12);
4 + 8, again?
> +#ifdef CONFIG_NFS_V4_2
> +static int nfs42_select_stateid(struct file *file, nfs4_stateid *stateid, fmode_t mode)
> +{
> + struct nfs_open_context *open;
> + struct nfs_lock_context *lock;
> + int ret;
> +
> + open = nfs_file_open_context(file);
> + if (!open)
> + return -EBADF;
> +
> + lock = nfs_get_lock_context(open);
> + if (IS_ERR(lock))
> + return PTR_ERR(lock);
> +
> + ret = nfs4_set_rw_stateid(stateid, open, lock, mode);
> +
> + if (lock)
> + nfs_put_lock_context(lock);
> + return ret;
> +}
I have to admit I don't really understand the purpose of this code,
can you add some comments to explain it?
> +static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
> +{
> + struct nfs_server *server = NFS_SERVER(file_inode(filep));
> + loff_t ret;
> +
> + switch (whence) {
> + case SEEK_HOLE:
> + case SEEK_DATA:
> + if (server->caps & NFS_CAP_SEEK) {
> + ret = nfs42_file_llseek(filep, offset, whence);
> + if (ret != -ENOTSUPP)
> + return ret;
> + server->caps &= ~NFS_CAP_SEEK;
> + }
> + default:
> + return nfs_file_llseek(filep, offset, whence);
> + }
> +}
> +#endif /* CONFIG_NFS_V4_2 */
> +
> const struct file_operations nfs4_file_operations = {
> +#ifdef CONFIG_NFS_V4_2
> + .llseek = nfs4_file_llseek,
> +#else
I suspect it would be a bit nicer to just add the code to a
nfs4_file_llseek that looks like:
static loff_t
nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
{
struct nfs_server *server = NFS_SERVER(file_inode(filep));
loff_t ret;
switch (whence) {
#ifdef CONFIG_NFS_V4_2
case SEEK_HOLE:
case SEEK_DATA:
if (NFS_SERVER(file_inode(filep)->caps & NFS_CAP_SEEK) {
ret = nfs42_file_llseek(filep, offset, whence);
if (ret != -ENOTSUPP)
return ret;
NFS_SERVER(file_inode(filep)->caps &= ~NFS_CAP_SEEK;
}
#endif
default:
return nfs_file_llseek(filep, offset, whence);
}
}
> diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
> index e13b59d..6b94428 100644
> --- a/fs/nfs/nfs4xdr.c
> +++ b/fs/nfs/nfs4xdr.c
> @@ -7427,6 +7427,10 @@ nfs4_stat_to_errno(int stat)
> return -stat;
> }
>
> +#if defined(CONFIG_NFS_V4_2)
> +#include "nfs42xdr.h"
> +#endif /* CONFIG_NFS_V4_2 */
How much code would need to be exported if this was a separate .c file?
Also I think in general #ifdef should be preferred to #if defined()
> diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
> index aed5b88..9fd2b78 100644
> --- a/fs/nfsd/nfs4proc.c
> +++ b/fs/nfsd/nfs4proc.c
> @@ -1018,7 +1018,7 @@ nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> struct nfsd4_seek *seek)
> {
> struct file *file;
> - __be32 status = nfs_ok;
> + __be32 status;
>
> status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
> &seek->seek_stateid,
This should have been part of the server patch I think.
On Tue, Sep 2, 2014 at 10:31 AM, Anna Schumaker
<[email protected]> wrote:
> From: Anna Schumaker <[email protected]>
>
> The SEEK operation is used when an application makes an lseek call with
> either the SEEK_HOLE or SEEK_DATA flags set. I fall back on
> nfs_file_llseek() if the server does not have SEEK support.
>
> Signed-off-by: Anna Schumaker <[email protected]>
> ---
> fs/nfs/Makefile | 1 +
> fs/nfs/inode.c | 2 +
> fs/nfs/nfs42.h | 14 +++++++
> fs/nfs/nfs42proc.c | 39 +++++++++++++++++++
> fs/nfs/nfs42xdr.h | 98 +++++++++++++++++++++++++++++++++++++++++++++++
> fs/nfs/nfs4_fs.h | 7 ++++
> fs/nfs/nfs4client.c | 2 +
> fs/nfs/nfs4file.c | 68 ++++++++++++++++++++++++++++++++
> fs/nfs/nfs4proc.c | 1 -
> fs/nfs/nfs4xdr.c | 7 ++++
> fs/nfsd/nfs4proc.c | 2 +-
> include/linux/nfs4.h | 3 ++
> include/linux/nfs_fs_sb.h | 1 +
> include/linux/nfs_xdr.h | 19 +++++++++
> 14 files changed, 262 insertions(+), 2 deletions(-)
> create mode 100644 fs/nfs/nfs42.h
> create mode 100644 fs/nfs/nfs42proc.c
> create mode 100644 fs/nfs/nfs42xdr.h
>
> diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
> index 4782e08..04cb830 100644
> --- a/fs/nfs/Makefile
> +++ b/fs/nfs/Makefile
> @@ -28,6 +28,7 @@ nfsv4-y := nfs4proc.o nfs4xdr.o nfs4state.o nfs4renewd.o nfs4super.o nfs4file.o
> nfsv4-$(CONFIG_NFS_USE_LEGACY_DNS) += cache_lib.o
> nfsv4-$(CONFIG_SYSCTL) += nfs4sysctl.o
> nfsv4-$(CONFIG_NFS_V4_1) += pnfs.o pnfs_dev.o
> +nfsv4-$(CONFIG_NFS_V4_2) += nfs42proc.o
>
> obj-$(CONFIG_PNFS_FILE_LAYOUT) += filelayout/
> obj-$(CONFIG_PNFS_OBJLAYOUT) += objlayout/
> diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
> index 577a36f..56d073e 100644
> --- a/fs/nfs/inode.c
> +++ b/fs/nfs/inode.c
> @@ -716,6 +716,7 @@ struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
> kfree(new);
> return res;
> }
> +EXPORT_SYMBOL_GPL(nfs_get_lock_context);
>
> void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
> {
> @@ -728,6 +729,7 @@ void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
> spin_unlock(&inode->i_lock);
> kfree(l_ctx);
> }
> +EXPORT_SYMBOL_GPL(nfs_put_lock_context);
>
> /**
> * nfs_close_context - Common close_context() routine NFSv2/v3
> diff --git a/fs/nfs/nfs42.h b/fs/nfs/nfs42.h
> new file mode 100644
> index 0000000..9eecdf2
> --- /dev/null
> +++ b/fs/nfs/nfs42.h
> @@ -0,0 +1,14 @@
> +/*
> + * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp>
> + */
> +
> +#ifndef __LINUX_FS_NFS_NFS4_2_H
> +#define __LINUX_FS_NFS_NFS4_2_H
> +
> +/* nfs4.2proc.c */
> +loff_t nfs42_proc_llseek(struct inode *, nfs4_stateid *, loff_t, int);
> +
> +/* nfs4.2xdr.h */
> +extern struct rpc_procinfo nfs4_2_procedures[];
> +
> +#endif /* __LINUX_FS_NFS_NFS4_2_H */
> diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
> new file mode 100644
> index 0000000..4c0703f
> --- /dev/null
> +++ b/fs/nfs/nfs42proc.c
> @@ -0,0 +1,39 @@
> +/*
> + * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp>
> + */
> +#include <linux/fs.h>
> +#include <linux/sunrpc/sched.h>
> +#include <linux/nfs.h>
> +#include <linux/nfs3.h>
> +#include <linux/nfs4.h>
> +#include <linux/nfs_xdr.h>
> +#include <linux/nfs_fs.h>
> +#include "nfs4_fs.h"
> +#include "nfs42.h"
> +
> +
> +loff_t nfs42_proc_llseek(struct inode *inode, nfs4_stateid *stateid,
> + loff_t offset, int whence)
> +{
> + struct nfs42_seek_args args = {
> + .sa_fh = NFS_FH(inode),
> + .sa_stateid = stateid,
> + .sa_offset = offset,
> + .sa_what = (whence == SEEK_HOLE) ?
> + NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
> + };
> + struct nfs42_seek_res res;
> + struct rpc_message msg = {
> + .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
> + .rpc_argp = &args,
> + .rpc_resp = &res,
> + };
> + struct nfs_server *server = NFS_SERVER(inode);
> + int status;
> +
> + status = nfs4_call_sync(server->client, server, &msg,
> + &args.seq_args, &res.seq_res, 0);
> + if (status)
> + return status;
> + return res.sr_offset;
> +}
> diff --git a/fs/nfs/nfs42xdr.h b/fs/nfs/nfs42xdr.h
> new file mode 100644
> index 0000000..a30cb3a
> --- /dev/null
> +++ b/fs/nfs/nfs42xdr.h
Given that this file contains source code, and cannot be used as a
header file in the normal sense, shouldn't it get a ".c" extension?
> @@ -0,0 +1,98 @@
> +/*
> + * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp>
> + */
> +#ifndef __LINUX_FS_NFS_NFS4_2XDR_H
> +#define __LINUX_FS_NFS_NFS4_2XDR_H
> +
> +#define encode_seek_maxsz (op_encode_hdr_maxsz + \
> + XDR_QUADLEN(NFS4_STATEID_SIZE) + \
encode_stateid_maxsz
> + 2 /* offset */ + \
> + 1 /* whence */)
> +#define decode_seek_maxsz (op_decode_hdr_maxsz + \
> + 1 /* eof */ + \
> + 1 /* whence */ + \
> + 2 /* offset */ + \
> + 2 /* length */)
> +
> +#define NFS4_enc_seek_sz (compound_encode_hdr_maxsz + \
> + encode_putfh_maxsz + \
> + encode_seek_maxsz)
> +#define NFS4_dec_seek_sz (compound_decode_hdr_maxsz + \
> + decode_putfh_maxsz + \
> + decode_seek_maxsz)
> +
> +
> +static void encode_seek(struct xdr_stream *xdr,
> + struct nfs42_seek_args *args,
> + struct compound_hdr *hdr)
> +{
> + encode_op_hdr(xdr, OP_SEEK, decode_seek_maxsz, hdr);
> + encode_nfs4_stateid(xdr, args->sa_stateid);
> + encode_uint64(xdr, args->sa_offset);
> + encode_uint32(xdr, args->sa_what);
> +}
> +
> +/*
> + * Encode SEEK request
> + */
> +static void nfs4_xdr_enc_seek(struct rpc_rqst *req,
> + struct xdr_stream *xdr,
> + struct nfs42_seek_args *args)
> +{
> + 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->sa_fh, &hdr);
> + encode_seek(xdr, args, &hdr);
> + encode_nops(&hdr);
> +}
> +
> +static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res)
> +{
> + int status;
> + __be32 *p;
> +
> + status = decode_op_hdr(xdr, OP_SEEK);
> + if (status)
> + return status;
> +
> + p = xdr_inline_decode(xdr, 12);
> + if (unlikely(!p))
> + goto out_overflow;
> +
> + res->sr_eof = be32_to_cpup(p++);
> + p = xdr_decode_hyper(p, &res->sr_offset);
> + return 0;
> +
> +out_overflow:
> + print_overflow_msg(__func__, xdr);
> + return -EIO;
> +}
> +
> +/*
> + * Decode SEEK request
> + */
> +static int nfs4_xdr_dec_seek(struct rpc_rqst *rqstp,
> + struct xdr_stream *xdr,
> + struct nfs42_seek_res *res)
> +{
> + 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_seek(xdr, res);
> +out:
> + return status;
> +}
> +#endif /* __LINUX_FS_NFS_NFS4_2XDR_H */
> diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
> index 92193ed..ec1078f 100644
> --- a/fs/nfs/nfs4_fs.h
> +++ b/fs/nfs/nfs4_fs.h
> @@ -227,6 +227,9 @@ int nfs4_replace_transport(struct nfs_server *server,
> const struct nfs4_fs_locations *locations);
>
> /* nfs4proc.c */
> +extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
> + struct rpc_message *, struct nfs4_sequence_args *,
> + struct nfs4_sequence_res *, int);
> extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
> extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
> extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
> @@ -364,6 +367,10 @@ nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
> }
> #endif /* CONFIG_NFS_V4_1 */
>
> +#ifdef CONFIG_NFS_V4_2
> +loff_t nfs42_proc_llseek(struct inode *, nfs4_stateid *, loff_t, int);
> +#endif /* CONFIG_NFS_V4_2 */
> +
> extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
>
> extern const u32 nfs4_fattr_bitmap[3];
> diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
> index 53e435a..f914797 100644
> --- a/fs/nfs/nfs4client.c
> +++ b/fs/nfs/nfs4client.c
> @@ -931,6 +931,8 @@ static int nfs4_server_common_setup(struct nfs_server *server,
> server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
> server->caps |= NFS_CAP_UIDGID_NOMAP;
>
> + if (server->nfs_client->cl_minorversion >= 2)
> + server->caps |= NFS_CAP_SEEK;
Please put this in nfs_v4_2_minor_ops.init_caps.
>
> /* Probe the root fh to retrieve its FSID and filehandle */
> error = nfs4_get_rootfh(server, mntfh, auth_probe);
> diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
> index a816f06..6702f99 100644
> --- a/fs/nfs/nfs4file.c
> +++ b/fs/nfs/nfs4file.c
> @@ -8,6 +8,10 @@
> #include "fscache.h"
> #include "pnfs.h"
>
> +#ifdef CONFIG_NFS_V4_2
> +#include "nfs42.h"
> +#endif
> +
> #define NFSDBG_FACILITY NFSDBG_FILE
>
> static int
> @@ -115,8 +119,72 @@ nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
> return ret;
> }
>
> +#ifdef CONFIG_NFS_V4_2
> +static int nfs42_select_stateid(struct file *file, nfs4_stateid *stateid, fmode_t mode)
> +{
> + struct nfs_open_context *open;
> + struct nfs_lock_context *lock;
> + int ret;
> +
> + open = nfs_file_open_context(file);
> + if (!open)
> + return -EBADF;
> +
> + lock = nfs_get_lock_context(open);
> + if (IS_ERR(lock))
> + return PTR_ERR(lock);
> +
> + ret = nfs4_set_rw_stateid(stateid, open, lock, mode);
> +
> + if (lock)
> + nfs_put_lock_context(lock);
> + return ret;
> +}
> +
> +static loff_t nfs42_file_llseek(struct file *filep, loff_t offset, int whence)
> +{
> + struct inode *inode = file_inode(filep);
> + nfs4_stateid stateid;
> + loff_t pos;
> + int err;
> +
> + err = nfs42_select_stateid(filep, &stateid, FMODE_READ | FMODE_WRITE);
> + if (err < 0)
> + return err;
> +
> + nfs_wb_all(inode);
> + pos = nfs42_proc_llseek(inode, &stateid, offset, whence);
> + if (pos < 0)
> + return pos;
> + return vfs_setpos(filep, pos, inode->i_sb->s_maxbytes);
> +}
> +
> +static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
> +{
> + struct nfs_server *server = NFS_SERVER(file_inode(filep));
> + loff_t ret;
> +
> + switch (whence) {
> + case SEEK_HOLE:
> + case SEEK_DATA:
> + if (server->caps & NFS_CAP_SEEK) {
> + ret = nfs42_file_llseek(filep, offset, whence);
> + if (ret != -ENOTSUPP)
> + return ret;
> + server->caps &= ~NFS_CAP_SEEK;
> + }
> + default:
> + return nfs_file_llseek(filep, offset, whence);
> + }
> +}
Doesn't this belong in nfs4proc.c (or even partly in nfs42proc.c)?
> +#endif /* CONFIG_NFS_V4_2 */
> +
> const struct file_operations nfs4_file_operations = {
> +#ifdef CONFIG_NFS_V4_2
> + .llseek = nfs4_file_llseek,
> +#else
> .llseek = nfs_file_llseek,
> +#endif
> .read = new_sync_read,
> .write = new_sync_write,
> .read_iter = nfs_file_read,
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index 18eb31c..bc8b7e4 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -875,7 +875,6 @@ static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
> return ret;
> }
>
> -static
> int nfs4_call_sync(struct rpc_clnt *clnt,
> struct nfs_server *server,
> struct rpc_message *msg,
> diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
> index e13b59d..6b94428 100644
> --- a/fs/nfs/nfs4xdr.c
> +++ b/fs/nfs/nfs4xdr.c
> @@ -7427,6 +7427,10 @@ nfs4_stat_to_errno(int stat)
> return -stat;
> }
>
> +#if defined(CONFIG_NFS_V4_2)
> +#include "nfs42xdr.h"
> +#endif /* CONFIG_NFS_V4_2 */
Question: why are we choosing to do an include in the case of the XDR
code, but not in the case of the "proc" file?
> +
> #define PROC(proc, argtype, restype) \
> [NFSPROC4_CLNT_##proc] = { \
> .p_proc = NFSPROC4_COMPOUND, \
> @@ -7495,6 +7499,9 @@ struct rpc_procinfo nfs4_procedures[] = {
> enc_bind_conn_to_session, dec_bind_conn_to_session),
> PROC(DESTROY_CLIENTID, enc_destroy_clientid, dec_destroy_clientid),
> #endif /* CONFIG_NFS_V4_1 */
> +#if defined(CONFIG_NFS_V4_2)
> + PROC(SEEK, enc_seek, dec_seek),
> +#endif /* CONFIG_NFS_V4_2 */
> };
>
> const struct rpc_version nfs_version4 = {
> diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
> index aed5b88..9fd2b78 100644
> --- a/fs/nfsd/nfs4proc.c
> +++ b/fs/nfsd/nfs4proc.c
> @@ -1018,7 +1018,7 @@ nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> struct nfsd4_seek *seek)
> {
> struct file *file;
> - __be32 status = nfs_ok;
> + __be32 status;
>
> status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
> &seek->seek_stateid,
> diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
> index 026b0c0..356acc2 100644
> --- a/include/linux/nfs4.h
> +++ b/include/linux/nfs4.h
> @@ -487,6 +487,9 @@ enum {
> NFSPROC4_CLNT_GETDEVICELIST,
> NFSPROC4_CLNT_BIND_CONN_TO_SESSION,
> NFSPROC4_CLNT_DESTROY_CLIENTID,
> +
> + /* nfs42 */
> + NFSPROC4_CLNT_SEEK,
> };
>
> /* nfs41 types */
> diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
> index 922be2e..a32ba0d 100644
> --- a/include/linux/nfs_fs_sb.h
> +++ b/include/linux/nfs_fs_sb.h
> @@ -230,5 +230,6 @@ struct nfs_server {
> #define NFS_CAP_STATEID_NFSV41 (1U << 16)
> #define NFS_CAP_ATOMIC_OPEN_V1 (1U << 17)
> #define NFS_CAP_SECURITY_LABEL (1U << 18)
> +#define NFS_CAP_SEEK (1U << 19)
>
> #endif
> diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
> index 0040629..9724257 100644
> --- a/include/linux/nfs_xdr.h
> +++ b/include/linux/nfs_xdr.h
> @@ -1239,6 +1239,25 @@ struct pnfs_ds_commit_info {
>
> #endif /* CONFIG_NFS_V4_1 */
>
> +#ifdef CONFIG_NFS_V4_2
> +struct nfs42_seek_args {
> + struct nfs4_sequence_args seq_args;
> +
> + struct nfs_fh *sa_fh;
> + nfs4_stateid *sa_stateid;
> + u64 sa_offset;
> + u32 sa_what;
> +};
> +
> +struct nfs42_seek_res {
> + struct nfs4_sequence_res seq_res;
> + unsigned int status;
> +
> + u32 sr_eof;
> + u64 sr_offset;
> +};
> +#endif
> +
> struct nfs_page;
>
> #define NFS_PAGEVEC_SIZE (8U)
> --
> 2.1.0
>
--
Trond Myklebust
Linux NFS client maintainer, PrimaryData
[email protected]
On 09/09/2014 01:19 PM, Trond Myklebust wrote:
> On Tue, Sep 2, 2014 at 10:31 AM, Anna Schumaker
> <[email protected]> wrote:
>> From: Anna Schumaker <[email protected]>
>>
>> The SEEK operation is used when an application makes an lseek call with
>> either the SEEK_HOLE or SEEK_DATA flags set. I fall back on
>> nfs_file_llseek() if the server does not have SEEK support.
>>
>> Signed-off-by: Anna Schumaker <[email protected]>
>> ---
>> fs/nfs/Makefile | 1 +
>> fs/nfs/inode.c | 2 +
>> fs/nfs/nfs42.h | 14 +++++++
>> fs/nfs/nfs42proc.c | 39 +++++++++++++++++++
>> fs/nfs/nfs42xdr.h | 98 +++++++++++++++++++++++++++++++++++++++++++++++
>> fs/nfs/nfs4_fs.h | 7 ++++
>> fs/nfs/nfs4client.c | 2 +
>> fs/nfs/nfs4file.c | 68 ++++++++++++++++++++++++++++++++
>> fs/nfs/nfs4proc.c | 1 -
>> fs/nfs/nfs4xdr.c | 7 ++++
>> fs/nfsd/nfs4proc.c | 2 +-
>> include/linux/nfs4.h | 3 ++
>> include/linux/nfs_fs_sb.h | 1 +
>> include/linux/nfs_xdr.h | 19 +++++++++
>> 14 files changed, 262 insertions(+), 2 deletions(-)
>> create mode 100644 fs/nfs/nfs42.h
>> create mode 100644 fs/nfs/nfs42proc.c
>> create mode 100644 fs/nfs/nfs42xdr.h
>>
>> diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
>> index 4782e08..04cb830 100644
>> --- a/fs/nfs/Makefile
>> +++ b/fs/nfs/Makefile
>> @@ -28,6 +28,7 @@ nfsv4-y := nfs4proc.o nfs4xdr.o nfs4state.o nfs4renewd.o nfs4super.o nfs4file.o
>> nfsv4-$(CONFIG_NFS_USE_LEGACY_DNS) += cache_lib.o
>> nfsv4-$(CONFIG_SYSCTL) += nfs4sysctl.o
>> nfsv4-$(CONFIG_NFS_V4_1) += pnfs.o pnfs_dev.o
>> +nfsv4-$(CONFIG_NFS_V4_2) += nfs42proc.o
>>
>> obj-$(CONFIG_PNFS_FILE_LAYOUT) += filelayout/
>> obj-$(CONFIG_PNFS_OBJLAYOUT) += objlayout/
>> diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
>> index 577a36f..56d073e 100644
>> --- a/fs/nfs/inode.c
>> +++ b/fs/nfs/inode.c
>> @@ -716,6 +716,7 @@ struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
>> kfree(new);
>> return res;
>> }
>> +EXPORT_SYMBOL_GPL(nfs_get_lock_context);
>>
>> void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
>> {
>> @@ -728,6 +729,7 @@ void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
>> spin_unlock(&inode->i_lock);
>> kfree(l_ctx);
>> }
>> +EXPORT_SYMBOL_GPL(nfs_put_lock_context);
>>
>> /**
>> * nfs_close_context - Common close_context() routine NFSv2/v3
>> diff --git a/fs/nfs/nfs42.h b/fs/nfs/nfs42.h
>> new file mode 100644
>> index 0000000..9eecdf2
>> --- /dev/null
>> +++ b/fs/nfs/nfs42.h
>> @@ -0,0 +1,14 @@
>> +/*
>> + * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp>
>> + */
>> +
>> +#ifndef __LINUX_FS_NFS_NFS4_2_H
>> +#define __LINUX_FS_NFS_NFS4_2_H
>> +
>> +/* nfs4.2proc.c */
>> +loff_t nfs42_proc_llseek(struct inode *, nfs4_stateid *, loff_t, int);
>> +
>> +/* nfs4.2xdr.h */
>> +extern struct rpc_procinfo nfs4_2_procedures[];
>> +
>> +#endif /* __LINUX_FS_NFS_NFS4_2_H */
>> diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
>> new file mode 100644
>> index 0000000..4c0703f
>> --- /dev/null
>> +++ b/fs/nfs/nfs42proc.c
>> @@ -0,0 +1,39 @@
>> +/*
>> + * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp>
>> + */
>> +#include <linux/fs.h>
>> +#include <linux/sunrpc/sched.h>
>> +#include <linux/nfs.h>
>> +#include <linux/nfs3.h>
>> +#include <linux/nfs4.h>
>> +#include <linux/nfs_xdr.h>
>> +#include <linux/nfs_fs.h>
>> +#include "nfs4_fs.h"
>> +#include "nfs42.h"
>> +
>> +
>> +loff_t nfs42_proc_llseek(struct inode *inode, nfs4_stateid *stateid,
>> + loff_t offset, int whence)
>> +{
>> + struct nfs42_seek_args args = {
>> + .sa_fh = NFS_FH(inode),
>> + .sa_stateid = stateid,
>> + .sa_offset = offset,
>> + .sa_what = (whence == SEEK_HOLE) ?
>> + NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
>> + };
>> + struct nfs42_seek_res res;
>> + struct rpc_message msg = {
>> + .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
>> + .rpc_argp = &args,
>> + .rpc_resp = &res,
>> + };
>> + struct nfs_server *server = NFS_SERVER(inode);
>> + int status;
>> +
>> + status = nfs4_call_sync(server->client, server, &msg,
>> + &args.seq_args, &res.seq_res, 0);
>> + if (status)
>> + return status;
>> + return res.sr_offset;
>> +}
>> diff --git a/fs/nfs/nfs42xdr.h b/fs/nfs/nfs42xdr.h
>> new file mode 100644
>> index 0000000..a30cb3a
>> --- /dev/null
>> +++ b/fs/nfs/nfs42xdr.h
>
> Given that this file contains source code, and cannot be used as a
> header file in the normal sense, shouldn't it get a ".c" extension?
Maybe? I wasn't sure what the convention is for including a source file, so I figured I would give it a .h extension to make it obvious how it is used.
>
>
>> @@ -0,0 +1,98 @@
>> +/*
>> + * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp>
>> + */
>> +#ifndef __LINUX_FS_NFS_NFS4_2XDR_H
>> +#define __LINUX_FS_NFS_NFS4_2XDR_H
>> +
>> +#define encode_seek_maxsz (op_encode_hdr_maxsz + \
>> + XDR_QUADLEN(NFS4_STATEID_SIZE) + \
>
> encode_stateid_maxsz
>
>> + 2 /* offset */ + \
>> + 1 /* whence */)
>> +#define decode_seek_maxsz (op_decode_hdr_maxsz + \
>> + 1 /* eof */ + \
>> + 1 /* whence */ + \
>> + 2 /* offset */ + \
>> + 2 /* length */)
>> +
>> +#define NFS4_enc_seek_sz (compound_encode_hdr_maxsz + \
>> + encode_putfh_maxsz + \
>> + encode_seek_maxsz)
>> +#define NFS4_dec_seek_sz (compound_decode_hdr_maxsz + \
>> + decode_putfh_maxsz + \
>> + decode_seek_maxsz)
>> +
>> +
>> +static void encode_seek(struct xdr_stream *xdr,
>> + struct nfs42_seek_args *args,
>> + struct compound_hdr *hdr)
>> +{
>> + encode_op_hdr(xdr, OP_SEEK, decode_seek_maxsz, hdr);
>> + encode_nfs4_stateid(xdr, args->sa_stateid);
>> + encode_uint64(xdr, args->sa_offset);
>> + encode_uint32(xdr, args->sa_what);
>> +}
>> +
>> +/*
>> + * Encode SEEK request
>> + */
>> +static void nfs4_xdr_enc_seek(struct rpc_rqst *req,
>> + struct xdr_stream *xdr,
>> + struct nfs42_seek_args *args)
>> +{
>> + 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->sa_fh, &hdr);
>> + encode_seek(xdr, args, &hdr);
>> + encode_nops(&hdr);
>> +}
>> +
>> +static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res)
>> +{
>> + int status;
>> + __be32 *p;
>> +
>> + status = decode_op_hdr(xdr, OP_SEEK);
>> + if (status)
>> + return status;
>> +
>> + p = xdr_inline_decode(xdr, 12);
>> + if (unlikely(!p))
>> + goto out_overflow;
>> +
>> + res->sr_eof = be32_to_cpup(p++);
>> + p = xdr_decode_hyper(p, &res->sr_offset);
>> + return 0;
>> +
>> +out_overflow:
>> + print_overflow_msg(__func__, xdr);
>> + return -EIO;
>> +}
>> +
>> +/*
>> + * Decode SEEK request
>> + */
>> +static int nfs4_xdr_dec_seek(struct rpc_rqst *rqstp,
>> + struct xdr_stream *xdr,
>> + struct nfs42_seek_res *res)
>> +{
>> + 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_seek(xdr, res);
>> +out:
>> + return status;
>> +}
>> +#endif /* __LINUX_FS_NFS_NFS4_2XDR_H */
>> diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
>> index 92193ed..ec1078f 100644
>> --- a/fs/nfs/nfs4_fs.h
>> +++ b/fs/nfs/nfs4_fs.h
>> @@ -227,6 +227,9 @@ int nfs4_replace_transport(struct nfs_server *server,
>> const struct nfs4_fs_locations *locations);
>>
>> /* nfs4proc.c */
>> +extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
>> + struct rpc_message *, struct nfs4_sequence_args *,
>> + struct nfs4_sequence_res *, int);
>> extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
>> extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
>> extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
>> @@ -364,6 +367,10 @@ nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
>> }
>> #endif /* CONFIG_NFS_V4_1 */
>>
>> +#ifdef CONFIG_NFS_V4_2
>> +loff_t nfs42_proc_llseek(struct inode *, nfs4_stateid *, loff_t, int);
>> +#endif /* CONFIG_NFS_V4_2 */
>> +
>> extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
>>
>> extern const u32 nfs4_fattr_bitmap[3];
>> diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
>> index 53e435a..f914797 100644
>> --- a/fs/nfs/nfs4client.c
>> +++ b/fs/nfs/nfs4client.c
>> @@ -931,6 +931,8 @@ static int nfs4_server_common_setup(struct nfs_server *server,
>> server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
>> server->caps |= NFS_CAP_UIDGID_NOMAP;
>>
>> + if (server->nfs_client->cl_minorversion >= 2)
>> + server->caps |= NFS_CAP_SEEK;
>
> Please put this in nfs_v4_2_minor_ops.init_caps.
Sure.
>
>
>>
>> /* Probe the root fh to retrieve its FSID and filehandle */
>> error = nfs4_get_rootfh(server, mntfh, auth_probe);
>> diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
>> index a816f06..6702f99 100644
>> --- a/fs/nfs/nfs4file.c
>> +++ b/fs/nfs/nfs4file.c
>> @@ -8,6 +8,10 @@
>> #include "fscache.h"
>> #include "pnfs.h"
>>
>> +#ifdef CONFIG_NFS_V4_2
>> +#include "nfs42.h"
>> +#endif
>> +
>> #define NFSDBG_FACILITY NFSDBG_FILE
>>
>> static int
>> @@ -115,8 +119,72 @@ nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
>> return ret;
>> }
>>
>> +#ifdef CONFIG_NFS_V4_2
>> +static int nfs42_select_stateid(struct file *file, nfs4_stateid *stateid, fmode_t mode)
>> +{
>> + struct nfs_open_context *open;
>> + struct nfs_lock_context *lock;
>> + int ret;
>> +
>> + open = nfs_file_open_context(file);
>> + if (!open)
>> + return -EBADF;
>> +
>> + lock = nfs_get_lock_context(open);
>> + if (IS_ERR(lock))
>> + return PTR_ERR(lock);
>> +
>> + ret = nfs4_set_rw_stateid(stateid, open, lock, mode);
>> +
>> + if (lock)
>> + nfs_put_lock_context(lock);
>> + return ret;
>> +}
>> +
>> +static loff_t nfs42_file_llseek(struct file *filep, loff_t offset, int whence)
>> +{
>> + struct inode *inode = file_inode(filep);
>> + nfs4_stateid stateid;
>> + loff_t pos;
>> + int err;
>> +
>> + err = nfs42_select_stateid(filep, &stateid, FMODE_READ | FMODE_WRITE);
>> + if (err < 0)
>> + return err;
>> +
>> + nfs_wb_all(inode);
>> + pos = nfs42_proc_llseek(inode, &stateid, offset, whence);
>> + if (pos < 0)
>> + return pos;
>> + return vfs_setpos(filep, pos, inode->i_sb->s_maxbytes);
>> +}
>> +
>> +static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
>> +{
>> + struct nfs_server *server = NFS_SERVER(file_inode(filep));
>> + loff_t ret;
>> +
>> + switch (whence) {
>> + case SEEK_HOLE:
>> + case SEEK_DATA:
>> + if (server->caps & NFS_CAP_SEEK) {
>> + ret = nfs42_file_llseek(filep, offset, whence);
>> + if (ret != -ENOTSUPP)
>> + return ret;
>> + server->caps &= ~NFS_CAP_SEEK;
>> + }
>> + default:
>> + return nfs_file_llseek(filep, offset, whence);
>> + }
>> +}
>
> Doesn't this belong in nfs4proc.c (or even partly in nfs42proc.c)?
I can move it there if that makes more sense. I put it in nfs4file.c because these functions are pointed to by the file_operations struct, and don't set up any rpc calls (like everything in nfs*proc.c does).
>
>> +#endif /* CONFIG_NFS_V4_2 */
>> +
>> const struct file_operations nfs4_file_operations = {
>> +#ifdef CONFIG_NFS_V4_2
>> + .llseek = nfs4_file_llseek,
>> +#else
>> .llseek = nfs_file_llseek,
>> +#endif
>> .read = new_sync_read,
>> .write = new_sync_write,
>> .read_iter = nfs_file_read,
>> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
>> index 18eb31c..bc8b7e4 100644
>> --- a/fs/nfs/nfs4proc.c
>> +++ b/fs/nfs/nfs4proc.c
>> @@ -875,7 +875,6 @@ static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
>> return ret;
>> }
>>
>> -static
>> int nfs4_call_sync(struct rpc_clnt *clnt,
>> struct nfs_server *server,
>> struct rpc_message *msg,
>> diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
>> index e13b59d..6b94428 100644
>> --- a/fs/nfs/nfs4xdr.c
>> +++ b/fs/nfs/nfs4xdr.c
>> @@ -7427,6 +7427,10 @@ nfs4_stat_to_errno(int stat)
>> return -stat;
>> }
>>
>> +#if defined(CONFIG_NFS_V4_2)
>> +#include "nfs42xdr.h"
>> +#endif /* CONFIG_NFS_V4_2 */
>
> Question: why are we choosing to do an include in the case of the XDR
> code, but not in the case of the "proc" file?
The XDR case uses a ton of maxsz defines and encode() / decode() functions, so it relies heavily on nfs4xdr.c. nfs42proc.c doesn't need quite as much out of nfs4proc.c, so it's easier to turn it into a standalone file. I can try to look into turning nfs42xdr.h into a standalone file instead of an include file if you would like!
Anna
>
>> +
>> #define PROC(proc, argtype, restype) \
>> [NFSPROC4_CLNT_##proc] = { \
>> .p_proc = NFSPROC4_COMPOUND, \
>> @@ -7495,6 +7499,9 @@ struct rpc_procinfo nfs4_procedures[] = {
>> enc_bind_conn_to_session, dec_bind_conn_to_session),
>> PROC(DESTROY_CLIENTID, enc_destroy_clientid, dec_destroy_clientid),
>> #endif /* CONFIG_NFS_V4_1 */
>> +#if defined(CONFIG_NFS_V4_2)
>> + PROC(SEEK, enc_seek, dec_seek),
>> +#endif /* CONFIG_NFS_V4_2 */
>> };
>>
>> const struct rpc_version nfs_version4 = {
>> diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
>> index aed5b88..9fd2b78 100644
>> --- a/fs/nfsd/nfs4proc.c
>> +++ b/fs/nfsd/nfs4proc.c
>> @@ -1018,7 +1018,7 @@ nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
>> struct nfsd4_seek *seek)
>> {
>> struct file *file;
>> - __be32 status = nfs_ok;
>> + __be32 status;
>>
>> status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
>> &seek->seek_stateid,
>> diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
>> index 026b0c0..356acc2 100644
>> --- a/include/linux/nfs4.h
>> +++ b/include/linux/nfs4.h
>> @@ -487,6 +487,9 @@ enum {
>> NFSPROC4_CLNT_GETDEVICELIST,
>> NFSPROC4_CLNT_BIND_CONN_TO_SESSION,
>> NFSPROC4_CLNT_DESTROY_CLIENTID,
>> +
>> + /* nfs42 */
>> + NFSPROC4_CLNT_SEEK,
>> };
>>
>> /* nfs41 types */
>> diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
>> index 922be2e..a32ba0d 100644
>> --- a/include/linux/nfs_fs_sb.h
>> +++ b/include/linux/nfs_fs_sb.h
>> @@ -230,5 +230,6 @@ struct nfs_server {
>> #define NFS_CAP_STATEID_NFSV41 (1U << 16)
>> #define NFS_CAP_ATOMIC_OPEN_V1 (1U << 17)
>> #define NFS_CAP_SECURITY_LABEL (1U << 18)
>> +#define NFS_CAP_SEEK (1U << 19)
>>
>> #endif
>> diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
>> index 0040629..9724257 100644
>> --- a/include/linux/nfs_xdr.h
>> +++ b/include/linux/nfs_xdr.h
>> @@ -1239,6 +1239,25 @@ struct pnfs_ds_commit_info {
>>
>> #endif /* CONFIG_NFS_V4_1 */
>>
>> +#ifdef CONFIG_NFS_V4_2
>> +struct nfs42_seek_args {
>> + struct nfs4_sequence_args seq_args;
>> +
>> + struct nfs_fh *sa_fh;
>> + nfs4_stateid *sa_stateid;
>> + u64 sa_offset;
>> + u32 sa_what;
>> +};
>> +
>> +struct nfs42_seek_res {
>> + struct nfs4_sequence_res seq_res;
>> + unsigned int status;
>> +
>> + u32 sr_eof;
>> + u64 sr_offset;
>> +};
>> +#endif
>> +
>> struct nfs_page;
>>
>> #define NFS_PAGEVEC_SIZE (8U)
>> --
>> 2.1.0
>>
>
>
>