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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/nfs/file.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 */
7#include <linux/fs.h>
8#include <linux/file.h>
9#include <linux/falloc.h>
10#include <linux/nfs_fs.h>
11#include "delegation.h"
12#include "internal.h"
13#include "iostat.h"
14#include "fscache.h"
15#include "pnfs.h"
16
17#include "nfstrace.h"
18
19#ifdef CONFIG_NFS_V4_2
20#include "nfs42.h"
21#endif
22
23#define NFSDBG_FACILITY NFSDBG_FILE
24
25static int
26nfs4_file_open(struct inode *inode, struct file *filp)
27{
28 struct nfs_open_context *ctx;
29 struct dentry *dentry = file_dentry(filp);
30 struct dentry *parent = NULL;
31 struct inode *dir;
32 unsigned openflags = filp->f_flags;
33 struct iattr attr;
34 int err;
35
36 /*
37 * If no cached dentry exists or if it's negative, NFSv4 handled the
38 * opens in ->lookup() or ->create().
39 *
40 * We only get this far for a cached positive dentry. We skipped
41 * revalidation, so handle it here by dropping the dentry and returning
42 * -EOPENSTALE. The VFS will retry the lookup/create/open.
43 */
44
45 dprintk("NFS: open file(%pd2)\n", dentry);
46
47 err = nfs_check_flags(openflags);
48 if (err)
49 return err;
50
51 if ((openflags & O_ACCMODE) == 3)
52 openflags--;
53
54 /* We can't create new files here */
55 openflags &= ~(O_CREAT|O_EXCL);
56
57 parent = dget_parent(dentry);
58 dir = d_inode(parent);
59
60 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
61 err = PTR_ERR(ctx);
62 if (IS_ERR(ctx))
63 goto out;
64
65 attr.ia_valid = ATTR_OPEN;
66 if (openflags & O_TRUNC) {
67 attr.ia_valid |= ATTR_SIZE;
68 attr.ia_size = 0;
69 filemap_write_and_wait(inode->i_mapping);
70 }
71
72 inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
73 if (IS_ERR(inode)) {
74 err = PTR_ERR(inode);
75 switch (err) {
76 case -EPERM:
77 case -EACCES:
78 case -EDQUOT:
79 case -ENOSPC:
80 case -EROFS:
81 goto out_put_ctx;
82 default:
83 goto out_drop;
84 }
85 }
86 if (inode != d_inode(dentry))
87 goto out_drop;
88
89 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
90 nfs_file_set_open_context(filp, ctx);
91 nfs_fscache_open_file(inode, filp);
92 err = 0;
93
94out_put_ctx:
95 put_nfs_open_context(ctx);
96out:
97 dput(parent);
98 return err;
99
100out_drop:
101 d_drop(dentry);
102 err = -EOPENSTALE;
103 goto out_put_ctx;
104}
105
106/*
107 * Flush all dirty pages, and check for write errors.
108 */
109static int
110nfs4_file_flush(struct file *file, fl_owner_t id)
111{
112 struct inode *inode = file_inode(file);
113
114 dprintk("NFS: flush(%pD2)\n", file);
115
116 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
117 if ((file->f_mode & FMODE_WRITE) == 0)
118 return 0;
119
120 /*
121 * If we're holding a write delegation, then check if we're required
122 * to flush the i/o on close. If not, then just start the i/o now.
123 */
124 if (!nfs4_delegation_flush_on_close(inode))
125 return filemap_fdatawrite(file->f_mapping);
126
127 /* Flush writes to the server and return any errors */
128 return vfs_fsync(file, 0);
129}
130
131#ifdef CONFIG_NFS_V4_2
132static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
133 struct file *file_out, loff_t pos_out,
134 size_t count, unsigned int flags)
135{
136 if (file_inode(file_in) == file_inode(file_out))
137 return -EINVAL;
138
139 return nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count);
140}
141
142static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
143{
144 loff_t ret;
145
146 switch (whence) {
147 case SEEK_HOLE:
148 case SEEK_DATA:
149 ret = nfs42_proc_llseek(filep, offset, whence);
150 if (ret != -ENOTSUPP)
151 return ret;
152 default:
153 return nfs_file_llseek(filep, offset, whence);
154 }
155}
156
157static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
158{
159 struct inode *inode = file_inode(filep);
160 long ret;
161
162 if (!S_ISREG(inode->i_mode))
163 return -EOPNOTSUPP;
164
165 if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
166 return -EOPNOTSUPP;
167
168 ret = inode_newsize_ok(inode, offset + len);
169 if (ret < 0)
170 return ret;
171
172 if (mode & FALLOC_FL_PUNCH_HOLE)
173 return nfs42_proc_deallocate(filep, offset, len);
174 return nfs42_proc_allocate(filep, offset, len);
175}
176
177static int nfs42_clone_file_range(struct file *src_file, loff_t src_off,
178 struct file *dst_file, loff_t dst_off, u64 count)
179{
180 struct inode *dst_inode = file_inode(dst_file);
181 struct nfs_server *server = NFS_SERVER(dst_inode);
182 struct inode *src_inode = file_inode(src_file);
183 unsigned int bs = server->clone_blksize;
184 bool same_inode = false;
185 int ret;
186
187 /* check alignment w.r.t. clone_blksize */
188 ret = -EINVAL;
189 if (bs) {
190 if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
191 goto out;
192 if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
193 goto out;
194 }
195
196 if (src_inode == dst_inode)
197 same_inode = true;
198
199 /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
200 if (same_inode) {
201 inode_lock(src_inode);
202 } else if (dst_inode < src_inode) {
203 inode_lock_nested(dst_inode, I_MUTEX_PARENT);
204 inode_lock_nested(src_inode, I_MUTEX_CHILD);
205 } else {
206 inode_lock_nested(src_inode, I_MUTEX_PARENT);
207 inode_lock_nested(dst_inode, I_MUTEX_CHILD);
208 }
209
210 /* flush all pending writes on both src and dst so that server
211 * has the latest data */
212 ret = nfs_sync_inode(src_inode);
213 if (ret)
214 goto out_unlock;
215 ret = nfs_sync_inode(dst_inode);
216 if (ret)
217 goto out_unlock;
218
219 ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
220
221 /* truncate inode page cache of the dst range so that future reads can fetch
222 * new data from server */
223 if (!ret)
224 truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
225
226out_unlock:
227 if (same_inode) {
228 inode_unlock(src_inode);
229 } else if (dst_inode < src_inode) {
230 inode_unlock(src_inode);
231 inode_unlock(dst_inode);
232 } else {
233 inode_unlock(dst_inode);
234 inode_unlock(src_inode);
235 }
236out:
237 return ret;
238}
239#endif /* CONFIG_NFS_V4_2 */
240
241const struct file_operations nfs4_file_operations = {
242 .read_iter = nfs_file_read,
243 .write_iter = nfs_file_write,
244 .mmap = nfs_file_mmap,
245 .open = nfs4_file_open,
246 .flush = nfs4_file_flush,
247 .release = nfs_file_release,
248 .fsync = nfs_file_fsync,
249 .lock = nfs_lock,
250 .flock = nfs_flock,
251 .splice_read = generic_file_splice_read,
252 .splice_write = iter_file_splice_write,
253 .check_flags = nfs_check_flags,
254 .setlease = simple_nosetlease,
255#ifdef CONFIG_NFS_V4_2
256 .copy_file_range = nfs4_copy_file_range,
257 .llseek = nfs4_file_llseek,
258 .fallocate = nfs42_fallocate,
259 .clone_file_range = nfs42_clone_file_range,
260#else
261 .llseek = nfs_file_llseek,
262#endif
263};
1/*
2 * linux/fs/nfs/file.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 */
6#include <linux/fs.h>
7#include <linux/file.h>
8#include <linux/falloc.h>
9#include <linux/nfs_fs.h>
10#include <uapi/linux/btrfs.h> /* BTRFS_IOC_CLONE/BTRFS_IOC_CLONE_RANGE */
11#include "delegation.h"
12#include "internal.h"
13#include "iostat.h"
14#include "fscache.h"
15#include "pnfs.h"
16
17#include "nfstrace.h"
18
19#ifdef CONFIG_NFS_V4_2
20#include "nfs42.h"
21#endif
22
23#define NFSDBG_FACILITY NFSDBG_FILE
24
25static int
26nfs4_file_open(struct inode *inode, struct file *filp)
27{
28 struct nfs_open_context *ctx;
29 struct dentry *dentry = file_dentry(filp);
30 struct dentry *parent = NULL;
31 struct inode *dir;
32 unsigned openflags = filp->f_flags;
33 struct iattr attr;
34 int err;
35
36 /*
37 * If no cached dentry exists or if it's negative, NFSv4 handled the
38 * opens in ->lookup() or ->create().
39 *
40 * We only get this far for a cached positive dentry. We skipped
41 * revalidation, so handle it here by dropping the dentry and returning
42 * -EOPENSTALE. The VFS will retry the lookup/create/open.
43 */
44
45 dprintk("NFS: open file(%pd2)\n", dentry);
46
47 err = nfs_check_flags(openflags);
48 if (err)
49 return err;
50
51 if ((openflags & O_ACCMODE) == 3)
52 openflags--;
53
54 /* We can't create new files here */
55 openflags &= ~(O_CREAT|O_EXCL);
56
57 parent = dget_parent(dentry);
58 dir = d_inode(parent);
59
60 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode);
61 err = PTR_ERR(ctx);
62 if (IS_ERR(ctx))
63 goto out;
64
65 attr.ia_valid = ATTR_OPEN;
66 if (openflags & O_TRUNC) {
67 attr.ia_valid |= ATTR_SIZE;
68 attr.ia_size = 0;
69 nfs_sync_inode(inode);
70 }
71
72 inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
73 if (IS_ERR(inode)) {
74 err = PTR_ERR(inode);
75 switch (err) {
76 case -EPERM:
77 case -EACCES:
78 case -EDQUOT:
79 case -ENOSPC:
80 case -EROFS:
81 goto out_put_ctx;
82 default:
83 goto out_drop;
84 }
85 }
86 if (inode != d_inode(dentry))
87 goto out_drop;
88
89 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
90 nfs_file_set_open_context(filp, ctx);
91 nfs_fscache_open_file(inode, filp);
92 err = 0;
93
94out_put_ctx:
95 put_nfs_open_context(ctx);
96out:
97 dput(parent);
98 return err;
99
100out_drop:
101 d_drop(dentry);
102 err = -EOPENSTALE;
103 goto out_put_ctx;
104}
105
106/*
107 * Flush all dirty pages, and check for write errors.
108 */
109static int
110nfs4_file_flush(struct file *file, fl_owner_t id)
111{
112 struct inode *inode = file_inode(file);
113
114 dprintk("NFS: flush(%pD2)\n", file);
115
116 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
117 if ((file->f_mode & FMODE_WRITE) == 0)
118 return 0;
119
120 /*
121 * If we're holding a write delegation, then check if we're required
122 * to flush the i/o on close. If not, then just start the i/o now.
123 */
124 if (!nfs4_delegation_flush_on_close(inode))
125 return filemap_fdatawrite(file->f_mapping);
126
127 /* Flush writes to the server and return any errors */
128 return vfs_fsync(file, 0);
129}
130
131#ifdef CONFIG_NFS_V4_2
132static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
133{
134 loff_t ret;
135
136 switch (whence) {
137 case SEEK_HOLE:
138 case SEEK_DATA:
139 ret = nfs42_proc_llseek(filep, offset, whence);
140 if (ret != -ENOTSUPP)
141 return ret;
142 default:
143 return nfs_file_llseek(filep, offset, whence);
144 }
145}
146
147static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
148{
149 struct inode *inode = file_inode(filep);
150 long ret;
151
152 if (!S_ISREG(inode->i_mode))
153 return -EOPNOTSUPP;
154
155 if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
156 return -EOPNOTSUPP;
157
158 ret = inode_newsize_ok(inode, offset + len);
159 if (ret < 0)
160 return ret;
161
162 if (mode & FALLOC_FL_PUNCH_HOLE)
163 return nfs42_proc_deallocate(filep, offset, len);
164 return nfs42_proc_allocate(filep, offset, len);
165}
166
167static int nfs42_clone_file_range(struct file *src_file, loff_t src_off,
168 struct file *dst_file, loff_t dst_off, u64 count)
169{
170 struct inode *dst_inode = file_inode(dst_file);
171 struct nfs_server *server = NFS_SERVER(dst_inode);
172 struct inode *src_inode = file_inode(src_file);
173 unsigned int bs = server->clone_blksize;
174 bool same_inode = false;
175 int ret;
176
177 /* check alignment w.r.t. clone_blksize */
178 ret = -EINVAL;
179 if (bs) {
180 if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
181 goto out;
182 if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
183 goto out;
184 }
185
186 if (src_inode == dst_inode)
187 same_inode = true;
188
189 /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
190 if (same_inode) {
191 inode_lock(src_inode);
192 } else if (dst_inode < src_inode) {
193 inode_lock_nested(dst_inode, I_MUTEX_PARENT);
194 inode_lock_nested(src_inode, I_MUTEX_CHILD);
195 } else {
196 inode_lock_nested(src_inode, I_MUTEX_PARENT);
197 inode_lock_nested(dst_inode, I_MUTEX_CHILD);
198 }
199
200 /* flush all pending writes on both src and dst so that server
201 * has the latest data */
202 ret = nfs_sync_inode(src_inode);
203 if (ret)
204 goto out_unlock;
205 ret = nfs_sync_inode(dst_inode);
206 if (ret)
207 goto out_unlock;
208
209 ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
210
211 /* truncate inode page cache of the dst range so that future reads can fetch
212 * new data from server */
213 if (!ret)
214 truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
215
216out_unlock:
217 if (same_inode) {
218 inode_unlock(src_inode);
219 } else if (dst_inode < src_inode) {
220 inode_unlock(src_inode);
221 inode_unlock(dst_inode);
222 } else {
223 inode_unlock(dst_inode);
224 inode_unlock(src_inode);
225 }
226out:
227 return ret;
228}
229#endif /* CONFIG_NFS_V4_2 */
230
231const struct file_operations nfs4_file_operations = {
232 .read_iter = nfs_file_read,
233 .write_iter = nfs_file_write,
234 .mmap = nfs_file_mmap,
235 .open = nfs4_file_open,
236 .flush = nfs4_file_flush,
237 .release = nfs_file_release,
238 .fsync = nfs_file_fsync,
239 .lock = nfs_lock,
240 .flock = nfs_flock,
241 .splice_read = nfs_file_splice_read,
242 .splice_write = iter_file_splice_write,
243 .check_flags = nfs_check_flags,
244 .setlease = simple_nosetlease,
245#ifdef CONFIG_NFS_V4_2
246 .llseek = nfs4_file_llseek,
247 .fallocate = nfs42_fallocate,
248 .clone_file_range = nfs42_clone_file_range,
249#else
250 .llseek = nfs_file_llseek,
251#endif
252};