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authorAnna Schumaker <Anna.Schumaker@netapp.com>2014-09-26 13:58:48 -0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-09-30 16:24:56 -0400
commit1c6dcbe5ceff81c2cf8d929646af675cd59fe7c0 (patch)
tree1e432e1decca1b3a6de427db31db5737d997a7f5 /fs/nfs/nfs42proc.c
parent4a3a0ebad1360696125bf34d89de55d71c4d0eaa (diff)
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NFS: Implement SEEK
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 <Anna.Schumaker@Netapp.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/nfs42proc.c')
-rw-r--r--fs/nfs/nfs42proc.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
new file mode 100644
index 000000000000..0886f1db5917
--- /dev/null
+++ b/fs/nfs/nfs42proc.c
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
+ */
+#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"
+
+static int nfs42_set_rw_stateid(nfs4_stateid *dst, struct file *file,
+ fmode_t fmode)
+{
+ struct nfs_open_context *open;
+ struct nfs_lock_context *lock;
+ int ret;
+
+ open = get_nfs_open_context(nfs_file_open_context(file));
+ lock = nfs_get_lock_context(open);
+ if (IS_ERR(lock)) {
+ put_nfs_open_context(open);
+ return PTR_ERR(lock);
+ }
+
+ ret = nfs4_set_rw_stateid(dst, open, lock, fmode);
+
+ nfs_put_lock_context(lock);
+ put_nfs_open_context(open);
+ return ret;
+}
+
+loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
+{
+ struct inode *inode = file_inode(filep);
+ struct nfs42_seek_args args = {
+ .sa_fh = NFS_FH(inode),
+ .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;
+
+ if (!(server->caps & NFS_CAP_SEEK))
+ return -ENOTSUPP;
+
+ status = nfs42_set_rw_stateid(&args.sa_stateid, filep, FMODE_READ);
+ if (status)
+ return status;
+
+ nfs_wb_all(inode);
+ status = nfs4_call_sync(server->client, server, &msg,
+ &args.seq_args, &res.seq_res, 0);
+ if (status == -ENOTSUPP)
+ server->caps &= ~NFS_CAP_SEEK;
+ if (status)
+ return status;
+
+ return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
+}