1c6dcbe5ce
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>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/*
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* Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
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*/
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#include <linux/fs.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/nfs.h>
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#include <linux/nfs3.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_xdr.h>
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#include <linux/nfs_fs.h>
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#include "nfs4_fs.h"
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#include "nfs42.h"
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static int nfs42_set_rw_stateid(nfs4_stateid *dst, struct file *file,
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fmode_t fmode)
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{
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struct nfs_open_context *open;
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struct nfs_lock_context *lock;
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int ret;
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open = get_nfs_open_context(nfs_file_open_context(file));
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lock = nfs_get_lock_context(open);
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if (IS_ERR(lock)) {
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put_nfs_open_context(open);
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return PTR_ERR(lock);
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}
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ret = nfs4_set_rw_stateid(dst, open, lock, fmode);
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nfs_put_lock_context(lock);
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put_nfs_open_context(open);
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return ret;
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}
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loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
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{
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struct inode *inode = file_inode(filep);
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struct nfs42_seek_args args = {
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.sa_fh = NFS_FH(inode),
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.sa_offset = offset,
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.sa_what = (whence == SEEK_HOLE) ?
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NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
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};
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struct nfs42_seek_res res;
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struct rpc_message msg = {
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.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
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.rpc_argp = &args,
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.rpc_resp = &res,
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};
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struct nfs_server *server = NFS_SERVER(inode);
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int status;
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if (!(server->caps & NFS_CAP_SEEK))
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return -ENOTSUPP;
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status = nfs42_set_rw_stateid(&args.sa_stateid, filep, FMODE_READ);
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if (status)
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return status;
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nfs_wb_all(inode);
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status = nfs4_call_sync(server->client, server, &msg,
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&args.seq_args, &res.seq_res, 0);
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if (status == -ENOTSUPP)
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server->caps &= ~NFS_CAP_SEEK;
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if (status)
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return status;
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return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
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}
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