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() when other flags are set or in the NFS < 4.2 case.
Signed-off-by: Anna Schumaker <bjschuma@xxxxxxxxxx>
---
Changed in v2:
- Remove unnecessary return from nfs4_xdr_enc_seek()
fs/nfs/inode.c | 2 +
fs/nfs/nfs4_fs.h | 4 ++
fs/nfs/nfs4file.c | 61 +++++++++++++++++++++++++++
fs/nfs/nfs4proc.c | 31 ++++++++++++++
fs/nfs/nfs4xdr.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/nfs4.h | 3 ++
include/linux/nfs_xdr.h | 22 ++++++++++
7 files changed, 232 insertions(+)
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 471ba59..e558d8f 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -680,6 +680,7 @@ 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)
{
@@ -692,6 +693,7 @@ 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/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 3ce79b0..a4abb3c 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -365,6 +365,10 @@ 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/nfs4file.c b/fs/nfs/nfs4file.c
index 1f01b55..82167fc 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -118,8 +118,69 @@ 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 **ctx)
+{
+ struct nfs_lock_context *lock;
+ int ret;
+
+ *ctx = nfs_file_open_context(file);
+ if (!*ctx)
+ return -EBADF;
+
+ lock = nfs_get_lock_context(*ctx);
+ if (IS_ERR(lock))
+ return PTR_ERR(lock);
+
+ ret = nfs4_set_rw_stateid(stateid, *ctx, 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)
+{
+ nfs4_stateid stateid;
+ struct nfs_open_context *ctx;
+ struct inode *inode = file_inode(filep);
+ loff_t pos;
+
+ pos = nfs42_select_stateid(filep, &stateid, FMODE_READ | FMODE_WRITE, &ctx);
+ if (pos < 0)
+ return pos;
+
+ 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));
+
+ if (server->nfs_client->cl_minorversion < 2)
+ return nfs_file_llseek(filep, offset, whence);
+
+ switch (whence) {
+ case SEEK_HOLE:
+ case SEEK_DATA:
+ return nfs42_file_llseek(filep, offset, whence);
+ 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 = do_sync_read,
.write = do_sync_write,
.aio_read = nfs_file_read,
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 7e28b5c..9907225 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -8163,6 +8163,37 @@ static bool nfs41_match_stateid(const nfs4_stateid *s1,
#endif /* CONFIG_NFS_V4_1 */
+#ifdef CONFIG_NFS_V4_2
+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,
+ };
+ 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;
+
+ if (whence == SEEK_HOLE)
+ args.sa_what = NFS4_CONTENT_HOLE;
+ else
+ args.sa_what = NFS4_CONTENT_DATA;
+
+ status = nfs4_call_sync(server->client, server, &msg,
+ &args.seq_args, &res.seq_res, 0);
+ if (status)
+ return status;
+ return res.sr_offset;
+}
+#endif /* CONFIG_NFS_V4_2 */
+
static bool nfs4_match_stateid(const nfs4_stateid *s1,
const nfs4_stateid *s2)
{
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index f903389..05396ee 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -420,6 +420,18 @@ static int nfs4_stat_to_errno(int);
#define decode_sequence_maxsz 0
#endif /* CONFIG_NFS_V4_1 */
+#ifdef CONFIG_NFS_V4_2
+#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 */)
+#endif /* CONFIG_NFS_V4_2 */
+
#define NFS4_enc_compound_sz (1024) /* XXX: large enough? */
#define NFS4_dec_compound_sz (1024) /* XXX: large enough? */
#define NFS4_enc_read_sz (compound_encode_hdr_maxsz + \
@@ -895,6 +907,15 @@ const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
EXPORT_SYMBOL_GPL(nfs41_maxgetdevinfo_overhead);
#endif /* CONFIG_NFS_V4_1 */
+#ifdef CONFIG_NFS_V4_2
+#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)
+#endif /* CONFIG_NFS_V4_2 */
+
static const umode_t nfs_type2fmt[] = {
[NF4BAD] = 0,
[NF4REG] = S_IFREG,
@@ -2074,6 +2095,18 @@ static void encode_free_stateid(struct xdr_stream *xdr,
}
#endif /* CONFIG_NFS_V4_1 */
+#ifdef CONFIG_NFS_V4_2
+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);
+}
+#endif /* CONFIG_NFS_V4_2 */
+
/*
* END OF "GENERIC" ENCODE ROUTINES.
*/
@@ -3049,6 +3082,26 @@ static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
}
#endif /* CONFIG_NFS_V4_1 */
+#ifdef CONFIG_NFS_V4_2
+/*
+ * 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);
+}
+#endif /* CONFIG_NFS_V4_2 */
+
static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
{
dprintk("nfs: %s: prematurely hit end of receive buffer. "
@@ -6016,6 +6069,33 @@ static int decode_free_stateid(struct xdr_stream *xdr,
}
#endif /* CONFIG_NFS_V4_1 */
+#ifdef CONFIG_NFS_V4_2
+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, 28);
+ if (unlikely(!p))
+ goto out_overflow;
+
+ res->sr_eof = be32_to_cpup(p++);
+ res->sr_whence = be32_to_cpup(p++);
+ p = xdr_decode_hyper(p, &res->sr_offset);
+ p = xdr_decode_hyper(p, &res->sr_length);
+ res->sr_allocated = be32_to_cpup(p);
+ return 0;
+
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+#endif /* CONFIG_NFS_V4_2 */
+
/*
* END OF "GENERIC" DECODE ROUTINES.
*/
@@ -7269,6 +7349,32 @@ out:
}
#endif /* CONFIG_NFS_V4_1 */
+#ifdef CONFIG_NFS_V4_2
+/*
+ * 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 /* CONFIG_NFS_V4_2 */
+
/**
* nfs4_decode_dirent - Decode a single NFSv4 directory entry stored in
* the local page cache.
@@ -7479,6 +7585,9 @@ 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/include/linux/nfs4.h b/include/linux/nfs4.h
index 144f511..05125b1 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -493,6 +493,9 @@ 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_xdr.h b/include/linux/nfs_xdr.h
index 3ccfcec..9fcabef 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1247,6 +1247,28 @@ 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;
+ u32 sr_whence;
+ u64 sr_offset;
+ u64 sr_length;
+ u32 sr_allocated;
+};
+#endif
+
struct nfs_page;
#define NFS_PAGEVEC_SIZE (8U)
--
1.8.4.2
--
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