4 * Copyright (C) 1992 Rick Sladkey
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"
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
);
65 attr
.ia_valid
= ATTR_OPEN
;
66 if (openflags
& O_TRUNC
) {
67 attr
.ia_valid
|= ATTR_SIZE
;
69 nfs_sync_inode(inode
);
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 vfs_fsync(file
, 0);
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 struct inode
*in_inode
= file_inode(file_in
);
137 struct inode
*out_inode
= file_inode(file_out
);
140 if (in_inode
== out_inode
)
143 /* flush any pending writes */
144 ret
= nfs_sync_inode(in_inode
);
147 ret
= nfs_sync_inode(out_inode
);
151 return nfs42_proc_copy(file_in
, pos_in
, file_out
, pos_out
, count
);
154 static loff_t
nfs4_file_llseek(struct file
*filep
, loff_t offset
, int whence
)
161 ret
= nfs42_proc_llseek(filep
, offset
, whence
);
162 if (ret
!= -ENOTSUPP
)
165 return nfs_file_llseek(filep
, offset
, whence
);
169 static long nfs42_fallocate(struct file
*filep
, int mode
, loff_t offset
, loff_t len
)
171 struct inode
*inode
= file_inode(filep
);
174 if (!S_ISREG(inode
->i_mode
))
177 if ((mode
!= 0) && (mode
!= (FALLOC_FL_PUNCH_HOLE
| FALLOC_FL_KEEP_SIZE
)))
180 ret
= inode_newsize_ok(inode
, offset
+ len
);
184 if (mode
& FALLOC_FL_PUNCH_HOLE
)
185 return nfs42_proc_deallocate(filep
, offset
, len
);
186 return nfs42_proc_allocate(filep
, offset
, len
);
189 static int nfs42_clone_file_range(struct file
*src_file
, loff_t src_off
,
190 struct file
*dst_file
, loff_t dst_off
, u64 count
)
192 struct inode
*dst_inode
= file_inode(dst_file
);
193 struct nfs_server
*server
= NFS_SERVER(dst_inode
);
194 struct inode
*src_inode
= file_inode(src_file
);
195 unsigned int bs
= server
->clone_blksize
;
196 bool same_inode
= false;
199 /* check alignment w.r.t. clone_blksize */
202 if (!IS_ALIGNED(src_off
, bs
) || !IS_ALIGNED(dst_off
, bs
))
204 if (!IS_ALIGNED(count
, bs
) && i_size_read(src_inode
) != (src_off
+ count
))
208 if (src_inode
== dst_inode
)
211 /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
213 inode_lock(src_inode
);
214 } else if (dst_inode
< src_inode
) {
215 inode_lock_nested(dst_inode
, I_MUTEX_PARENT
);
216 inode_lock_nested(src_inode
, I_MUTEX_CHILD
);
218 inode_lock_nested(src_inode
, I_MUTEX_PARENT
);
219 inode_lock_nested(dst_inode
, I_MUTEX_CHILD
);
222 /* flush all pending writes on both src and dst so that server
223 * has the latest data */
224 ret
= nfs_sync_inode(src_inode
);
227 ret
= nfs_sync_inode(dst_inode
);
231 ret
= nfs42_proc_clone(src_file
, dst_file
, src_off
, dst_off
, count
);
233 /* truncate inode page cache of the dst range so that future reads can fetch
234 * new data from server */
236 truncate_inode_pages_range(&dst_inode
->i_data
, dst_off
, dst_off
+ count
- 1);
240 inode_unlock(src_inode
);
241 } else if (dst_inode
< src_inode
) {
242 inode_unlock(src_inode
);
243 inode_unlock(dst_inode
);
245 inode_unlock(dst_inode
);
246 inode_unlock(src_inode
);
251 #endif /* CONFIG_NFS_V4_2 */
253 const struct file_operations nfs4_file_operations
= {
254 .read_iter
= nfs_file_read
,
255 .write_iter
= nfs_file_write
,
256 .mmap
= nfs_file_mmap
,
257 .open
= nfs4_file_open
,
258 .flush
= nfs4_file_flush
,
259 .release
= nfs_file_release
,
260 .fsync
= nfs_file_fsync
,
263 .splice_read
= nfs_file_splice_read
,
264 .splice_write
= iter_file_splice_write
,
265 .check_flags
= nfs_check_flags
,
266 .setlease
= simple_nosetlease
,
267 #ifdef CONFIG_NFS_V4_2
268 .copy_file_range
= nfs4_copy_file_range
,
269 .llseek
= nfs4_file_llseek
,
270 .fallocate
= nfs42_fallocate
,
271 .clone_file_range
= nfs42_clone_file_range
,
273 .llseek
= nfs_file_llseek
,