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Bryan Schumakerce4ef7c2012-07-16 16:39:15 -04001/*
2 * linux/fs/nfs/file.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 */
Anna Schumakerf4ac1672014-11-25 13:18:15 -05006#include <linux/fs.h>
7#include <linux/falloc.h>
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -04008#include <linux/nfs_fs.h>
9#include "internal.h"
David Howellsa4ff1462012-12-05 16:31:49 +000010#include "fscache.h"
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040011#include "pnfs.h"
12
Trond Myklebust81b79af2015-03-25 19:09:08 -040013#include "nfstrace.h"
14
Anna Schumaker1c6dcbe2014-09-26 13:58:48 -040015#ifdef CONFIG_NFS_V4_2
16#include "nfs42.h"
17#endif
18
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040019#define NFSDBG_FACILITY NFSDBG_FILE
20
21static int
22nfs4_file_open(struct inode *inode, struct file *filp)
23{
24 struct nfs_open_context *ctx;
25 struct dentry *dentry = filp->f_path.dentry;
26 struct dentry *parent = NULL;
27 struct inode *dir;
28 unsigned openflags = filp->f_flags;
29 struct iattr attr;
Trond Myklebust5bc2afc2013-09-23 18:01:28 -040030 int opened = 0;
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040031 int err;
32
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040033 /*
34 * If no cached dentry exists or if it's negative, NFSv4 handled the
35 * opens in ->lookup() or ->create().
36 *
37 * We only get this far for a cached positive dentry. We skipped
38 * revalidation, so handle it here by dropping the dentry and returning
39 * -EOPENSTALE. The VFS will retry the lookup/create/open.
40 */
41
Al Viro6de14722013-09-16 10:53:17 -040042 dprintk("NFS: open file(%pd2)\n", dentry);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040043
Benjamin Coddington18a60082015-06-25 09:25:50 -040044 err = nfs_check_flags(openflags);
45 if (err)
46 return err;
47
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040048 if ((openflags & O_ACCMODE) == 3)
49 openflags--;
50
51 /* We can't create new files here */
52 openflags &= ~(O_CREAT|O_EXCL);
53
54 parent = dget_parent(dentry);
David Howells2b0143b2015-03-17 22:25:59 +000055 dir = d_inode(parent);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040056
57 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
58 err = PTR_ERR(ctx);
59 if (IS_ERR(ctx))
60 goto out;
61
62 attr.ia_valid = ATTR_OPEN;
63 if (openflags & O_TRUNC) {
64 attr.ia_valid |= ATTR_SIZE;
65 attr.ia_size = 0;
Trond Myklebust9e1681c2015-03-25 17:23:31 -040066 nfs_sync_inode(inode);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040067 }
68
Trond Myklebust5bc2afc2013-09-23 18:01:28 -040069 inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, &opened);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040070 if (IS_ERR(inode)) {
71 err = PTR_ERR(inode);
72 switch (err) {
73 case -EPERM:
74 case -EACCES:
75 case -EDQUOT:
76 case -ENOSPC:
77 case -EROFS:
78 goto out_put_ctx;
79 default:
80 goto out_drop;
81 }
82 }
David Howells2b0143b2015-03-17 22:25:59 +000083 if (inode != d_inode(dentry))
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040084 goto out_drop;
85
86 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
87 nfs_file_set_open_context(filp, ctx);
David Howellsf1fe29b2013-09-27 11:20:03 +010088 nfs_fscache_open_file(inode, filp);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040089 err = 0;
90
91out_put_ctx:
92 put_nfs_open_context(ctx);
93out:
94 dput(parent);
95 return err;
96
97out_drop:
98 d_drop(dentry);
99 err = -EOPENSTALE;
100 goto out_put_ctx;
101}
102
103static int
104nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
105{
106 int ret;
Al Viro496ad9a2013-01-23 17:07:38 -0500107 struct inode *inode = file_inode(file);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400108
Trond Myklebust81b79af2015-03-25 19:09:08 -0400109 trace_nfs_fsync_enter(inode);
110
Trond Myklebusta0815d52015-03-25 18:58:53 -0400111 nfs_inode_dio_wait(inode);
Trond Myklebust05990d12012-09-11 16:01:22 -0400112 do {
113 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
114 if (ret != 0)
115 break;
116 mutex_lock(&inode->i_mutex);
117 ret = nfs_file_fsync_commit(file, start, end, datasync);
Christoph Hellwig1b338092014-04-21 10:29:17 -0700118 if (!ret)
Trond Myklebust5bb89b42015-03-25 14:14:42 -0400119 ret = pnfs_sync_inode(inode, !!datasync);
Trond Myklebust05990d12012-09-11 16:01:22 -0400120 mutex_unlock(&inode->i_mutex);
Trond Myklebustdcfc4f22012-09-11 16:19:38 -0400121 /*
122 * If nfs_file_fsync_commit detected a server reboot, then
123 * resend all dirty pages that might have been covered by
124 * the NFS_CONTEXT_RESEND_WRITES flag
125 */
126 start = 0;
127 end = LLONG_MAX;
Trond Myklebust05990d12012-09-11 16:01:22 -0400128 } while (ret == -EAGAIN);
129
Trond Myklebust81b79af2015-03-25 19:09:08 -0400130 trace_nfs_fsync_exit(inode, ret);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400131 return ret;
132}
133
Anna Schumaker1c6dcbe2014-09-26 13:58:48 -0400134#ifdef CONFIG_NFS_V4_2
135static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
136{
137 loff_t ret;
138
139 switch (whence) {
140 case SEEK_HOLE:
141 case SEEK_DATA:
142 ret = nfs42_proc_llseek(filep, offset, whence);
143 if (ret != -ENOTSUPP)
144 return ret;
145 default:
146 return nfs_file_llseek(filep, offset, whence);
147 }
148}
Anna Schumakerf4ac1672014-11-25 13:18:15 -0500149
150static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
151{
152 struct inode *inode = file_inode(filep);
153 long ret;
154
155 if (!S_ISREG(inode->i_mode))
156 return -EOPNOTSUPP;
157
Anna Schumaker624bd5b2014-11-25 13:18:16 -0500158 if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
Anna Schumakerf4ac1672014-11-25 13:18:15 -0500159 return -EOPNOTSUPP;
160
161 ret = inode_newsize_ok(inode, offset + len);
162 if (ret < 0)
163 return ret;
164
Anna Schumaker624bd5b2014-11-25 13:18:16 -0500165 if (mode & FALLOC_FL_PUNCH_HOLE)
Anna Schumakerf830f7d2015-03-16 14:06:24 -0400166 return nfs42_proc_deallocate(filep, offset, len);
167 return nfs42_proc_allocate(filep, offset, len);
Anna Schumakerf4ac1672014-11-25 13:18:15 -0500168}
Anna Schumaker1c6dcbe2014-09-26 13:58:48 -0400169#endif /* CONFIG_NFS_V4_2 */
170
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400171const struct file_operations nfs4_file_operations = {
Anna Schumaker1c6dcbe2014-09-26 13:58:48 -0400172#ifdef CONFIG_NFS_V4_2
173 .llseek = nfs4_file_llseek,
174#else
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400175 .llseek = nfs_file_llseek,
Anna Schumaker1c6dcbe2014-09-26 13:58:48 -0400176#endif
Al Viro3aa2d192014-04-02 20:14:12 -0400177 .read_iter = nfs_file_read,
Al Viroedaf4362014-04-03 14:07:25 -0400178 .write_iter = nfs_file_write,
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400179 .mmap = nfs_file_mmap,
180 .open = nfs4_file_open,
181 .flush = nfs_file_flush,
182 .release = nfs_file_release,
183 .fsync = nfs4_file_fsync,
184 .lock = nfs_lock,
185 .flock = nfs_flock,
186 .splice_read = nfs_file_splice_read,
Al Viro4da54c22014-04-05 04:37:17 -0400187 .splice_write = iter_file_splice_write,
Anna Schumakerf4ac1672014-11-25 13:18:15 -0500188#ifdef CONFIG_NFS_V4_2
189 .fallocate = nfs42_fallocate,
190#endif /* CONFIG_NFS_V4_2 */
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400191 .check_flags = nfs_check_flags,
Jeff Layton1c994a02014-08-27 06:49:41 -0400192 .setlease = simple_nosetlease,
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400193};