1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 1992 Rick Sladkey
8 #include <linux/file.h>
9 #include <linux/falloc.h>
10 #include <linux/nfs_fs.h>
11 #include "delegation.h"
19 #ifdef CONFIG_NFS_V4_2
23 #define NFSDBG_FACILITY NFSDBG_FILE
26 nfs4_file_open(struct inode
*inode
, struct file
*filp
)
28 struct nfs_open_context
*ctx
;
29 struct dentry
*dentry
= file_dentry(filp
);
30 struct dentry
*parent
= NULL
;
32 unsigned openflags
= filp
->f_flags
;
37 * If no cached dentry exists or if it's negative, NFSv4 handled the
38 * opens in ->lookup() or ->create().
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.
45 dprintk("NFS: open file(%pd2)\n", dentry
);
47 err
= nfs_check_flags(openflags
);
51 if ((openflags
& O_ACCMODE
) == 3)
54 /* We can't create new files here */
55 openflags
&= ~(O_CREAT
|O_EXCL
);
57 parent
= dget_parent(dentry
);
58 dir
= d_inode(parent
);
60 ctx
= alloc_nfs_open_context(file_dentry(filp
), filp
->f_mode
, filp
);
65 attr
.ia_valid
= ATTR_OPEN
;
66 if (openflags
& O_TRUNC
) {
67 attr
.ia_valid
|= ATTR_SIZE
;
69 filemap_write_and_wait(inode
->i_mapping
);
72 inode
= NFS_PROTO(dir
)->open_context(dir
, ctx
, openflags
, &attr
, NULL
);
86 if (inode
!= d_inode(dentry
))
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
);
95 put_nfs_open_context(ctx
);
107 * Flush all dirty pages, and check for write errors.
110 nfs4_file_flush(struct file
*file
, fl_owner_t id
)
112 struct inode
*inode
= file_inode(file
);
114 dprintk("NFS: flush(%pD2)\n", file
);
116 nfs_inc_stats(inode
, NFSIOS_VFSFLUSH
);
117 if ((file
->f_mode
& FMODE_WRITE
) == 0)
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.
124 if (!nfs4_delegation_flush_on_close(inode
))
125 return filemap_fdatawrite(file
->f_mapping
);
127 /* Flush writes to the server and return any errors */
128 return nfs_wb_all(inode
);
131 #ifdef CONFIG_NFS_V4_2
132 static 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
)
136 if (!nfs_server_capable(file_inode(file_out
), NFS_CAP_COPY
))
138 if (file_inode(file_in
) == file_inode(file_out
))
140 return nfs42_proc_copy(file_in
, pos_in
, file_out
, pos_out
, count
);
143 static ssize_t
nfs4_copy_file_range(struct file
*file_in
, loff_t pos_in
,
144 struct file
*file_out
, loff_t pos_out
,
145 size_t count
, unsigned int flags
)
149 ret
= __nfs4_copy_file_range(file_in
, pos_in
, file_out
, pos_out
, count
,
151 if (ret
== -EOPNOTSUPP
)
152 ret
= generic_copy_file_range(file_in
, pos_in
, file_out
,
153 pos_out
, count
, flags
);
157 static loff_t
nfs4_file_llseek(struct file
*filep
, loff_t offset
, int whence
)
164 ret
= nfs42_proc_llseek(filep
, offset
, whence
);
165 if (ret
!= -ENOTSUPP
)
169 return nfs_file_llseek(filep
, offset
, whence
);
173 static long nfs42_fallocate(struct file
*filep
, int mode
, loff_t offset
, loff_t len
)
175 struct inode
*inode
= file_inode(filep
);
178 if (!S_ISREG(inode
->i_mode
))
181 if ((mode
!= 0) && (mode
!= (FALLOC_FL_PUNCH_HOLE
| FALLOC_FL_KEEP_SIZE
)))
184 ret
= inode_newsize_ok(inode
, offset
+ len
);
188 if (mode
& FALLOC_FL_PUNCH_HOLE
)
189 return nfs42_proc_deallocate(filep
, offset
, len
);
190 return nfs42_proc_allocate(filep
, offset
, len
);
193 static loff_t
nfs42_remap_file_range(struct file
*src_file
, loff_t src_off
,
194 struct file
*dst_file
, loff_t dst_off
, loff_t count
,
195 unsigned int remap_flags
)
197 struct inode
*dst_inode
= file_inode(dst_file
);
198 struct nfs_server
*server
= NFS_SERVER(dst_inode
);
199 struct inode
*src_inode
= file_inode(src_file
);
200 unsigned int bs
= server
->clone_blksize
;
201 bool same_inode
= false;
204 if (remap_flags
& ~(REMAP_FILE_DEDUP
| REMAP_FILE_ADVISORY
))
207 /* check alignment w.r.t. clone_blksize */
210 if (!IS_ALIGNED(src_off
, bs
) || !IS_ALIGNED(dst_off
, bs
))
212 if (!IS_ALIGNED(count
, bs
) && i_size_read(src_inode
) != (src_off
+ count
))
216 if (src_inode
== dst_inode
)
219 /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
221 inode_lock(src_inode
);
222 } else if (dst_inode
< src_inode
) {
223 inode_lock_nested(dst_inode
, I_MUTEX_PARENT
);
224 inode_lock_nested(src_inode
, I_MUTEX_CHILD
);
226 inode_lock_nested(src_inode
, I_MUTEX_PARENT
);
227 inode_lock_nested(dst_inode
, I_MUTEX_CHILD
);
230 /* flush all pending writes on both src and dst so that server
231 * has the latest data */
232 ret
= nfs_sync_inode(src_inode
);
235 ret
= nfs_sync_inode(dst_inode
);
239 ret
= nfs42_proc_clone(src_file
, dst_file
, src_off
, dst_off
, count
);
241 /* truncate inode page cache of the dst range so that future reads can fetch
242 * new data from server */
244 truncate_inode_pages_range(&dst_inode
->i_data
, dst_off
, dst_off
+ count
- 1);
248 inode_unlock(src_inode
);
249 } else if (dst_inode
< src_inode
) {
250 inode_unlock(src_inode
);
251 inode_unlock(dst_inode
);
253 inode_unlock(dst_inode
);
254 inode_unlock(src_inode
);
257 return ret
< 0 ? ret
: count
;
259 #endif /* CONFIG_NFS_V4_2 */
261 const struct file_operations nfs4_file_operations
= {
262 .read_iter
= nfs_file_read
,
263 .write_iter
= nfs_file_write
,
264 .mmap
= nfs_file_mmap
,
265 .open
= nfs4_file_open
,
266 .flush
= nfs4_file_flush
,
267 .release
= nfs_file_release
,
268 .fsync
= nfs_file_fsync
,
271 .splice_read
= generic_file_splice_read
,
272 .splice_write
= iter_file_splice_write
,
273 .check_flags
= nfs_check_flags
,
274 .setlease
= simple_nosetlease
,
275 #ifdef CONFIG_NFS_V4_2
276 .copy_file_range
= nfs4_copy_file_range
,
277 .llseek
= nfs4_file_llseek
,
278 .fallocate
= nfs42_fallocate
,
279 .remap_file_range
= nfs42_remap_file_range
,
281 .llseek
= nfs_file_llseek
,