Commit | Line | Data |
---|---|---|
ce4ef7c0 BS |
1 | /* |
2 | * linux/fs/nfs/file.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | */ | |
f4ac1674 | 6 | #include <linux/fs.h> |
bea51b30 | 7 | #include <linux/file.h> |
f4ac1674 | 8 | #include <linux/falloc.h> |
ce4ef7c0 | 9 | #include <linux/nfs_fs.h> |
0f42a6a9 | 10 | #include <uapi/linux/btrfs.h> /* BTRFS_IOC_CLONE/BTRFS_IOC_CLONE_RANGE */ |
5445b1fb | 11 | #include "delegation.h" |
ce4ef7c0 | 12 | #include "internal.h" |
5445b1fb | 13 | #include "iostat.h" |
a4ff1468 | 14 | #include "fscache.h" |
ce4ef7c0 BS |
15 | #include "pnfs.h" |
16 | ||
81b79afb TM |
17 | #include "nfstrace.h" |
18 | ||
1c6dcbe5 AS |
19 | #ifdef CONFIG_NFS_V4_2 |
20 | #include "nfs42.h" | |
21 | #endif | |
22 | ||
ce4ef7c0 BS |
23 | #define NFSDBG_FACILITY NFSDBG_FILE |
24 | ||
25 | static int | |
26 | nfs4_file_open(struct inode *inode, struct file *filp) | |
27 | { | |
28 | struct nfs_open_context *ctx; | |
29 | struct dentry *dentry = filp->f_path.dentry; | |
30 | struct dentry *parent = NULL; | |
31 | struct inode *dir; | |
32 | unsigned openflags = filp->f_flags; | |
33 | struct iattr attr; | |
34 | int err; | |
35 | ||
ce4ef7c0 BS |
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 | ||
6de1472f | 45 | dprintk("NFS: open file(%pd2)\n", dentry); |
ce4ef7c0 | 46 | |
18a60089 BC |
47 | err = nfs_check_flags(openflags); |
48 | if (err) | |
49 | return err; | |
50 | ||
ce4ef7c0 BS |
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); | |
2b0143b5 | 58 | dir = d_inode(parent); |
ce4ef7c0 BS |
59 | |
60 | ctx = alloc_nfs_open_context(filp->f_path.dentry, 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; | |
9e1681c2 | 69 | nfs_sync_inode(inode); |
ce4ef7c0 BS |
70 | } |
71 | ||
c5c3fb5f | 72 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL); |
ce4ef7c0 BS |
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 | } | |
2b0143b5 | 86 | if (inode != d_inode(dentry)) |
ce4ef7c0 BS |
87 | goto out_drop; |
88 | ||
89 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
90 | nfs_file_set_open_context(filp, ctx); | |
f1fe29b4 | 91 | nfs_fscache_open_file(inode, filp); |
ce4ef7c0 BS |
92 | err = 0; |
93 | ||
94 | out_put_ctx: | |
95 | put_nfs_open_context(ctx); | |
96 | out: | |
97 | dput(parent); | |
98 | return err; | |
99 | ||
100 | out_drop: | |
101 | d_drop(dentry); | |
102 | err = -EOPENSTALE; | |
103 | goto out_put_ctx; | |
104 | } | |
105 | ||
5445b1fb TM |
106 | /* |
107 | * Flush all dirty pages, and check for write errors. | |
108 | */ | |
109 | static int | |
110 | nfs4_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 | ||
ce4ef7c0 BS |
131 | static int |
132 | nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) | |
133 | { | |
134 | int ret; | |
496ad9aa | 135 | struct inode *inode = file_inode(file); |
ce4ef7c0 | 136 | |
81b79afb TM |
137 | trace_nfs_fsync_enter(inode); |
138 | ||
a0815d55 | 139 | nfs_inode_dio_wait(inode); |
05990d1b TM |
140 | do { |
141 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
142 | if (ret != 0) | |
143 | break; | |
5955102c | 144 | inode_lock(inode); |
05990d1b | 145 | ret = nfs_file_fsync_commit(file, start, end, datasync); |
1b33809e | 146 | if (!ret) |
5bb89b47 | 147 | ret = pnfs_sync_inode(inode, !!datasync); |
5955102c | 148 | inode_unlock(inode); |
dcfc4f25 TM |
149 | /* |
150 | * If nfs_file_fsync_commit detected a server reboot, then | |
151 | * resend all dirty pages that might have been covered by | |
152 | * the NFS_CONTEXT_RESEND_WRITES flag | |
153 | */ | |
154 | start = 0; | |
155 | end = LLONG_MAX; | |
05990d1b TM |
156 | } while (ret == -EAGAIN); |
157 | ||
81b79afb | 158 | trace_nfs_fsync_exit(inode, ret); |
ce4ef7c0 BS |
159 | return ret; |
160 | } | |
161 | ||
1c6dcbe5 AS |
162 | #ifdef CONFIG_NFS_V4_2 |
163 | static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence) | |
164 | { | |
165 | loff_t ret; | |
166 | ||
167 | switch (whence) { | |
168 | case SEEK_HOLE: | |
169 | case SEEK_DATA: | |
170 | ret = nfs42_proc_llseek(filep, offset, whence); | |
171 | if (ret != -ENOTSUPP) | |
172 | return ret; | |
173 | default: | |
174 | return nfs_file_llseek(filep, offset, whence); | |
175 | } | |
176 | } | |
f4ac1674 AS |
177 | |
178 | static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len) | |
179 | { | |
180 | struct inode *inode = file_inode(filep); | |
181 | long ret; | |
182 | ||
183 | if (!S_ISREG(inode->i_mode)) | |
184 | return -EOPNOTSUPP; | |
185 | ||
624bd5b7 | 186 | if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))) |
f4ac1674 AS |
187 | return -EOPNOTSUPP; |
188 | ||
189 | ret = inode_newsize_ok(inode, offset + len); | |
190 | if (ret < 0) | |
191 | return ret; | |
192 | ||
624bd5b7 | 193 | if (mode & FALLOC_FL_PUNCH_HOLE) |
f830f7dd AS |
194 | return nfs42_proc_deallocate(filep, offset, len); |
195 | return nfs42_proc_allocate(filep, offset, len); | |
f4ac1674 | 196 | } |
bea51b30 | 197 | |
04b38d60 CH |
198 | static int nfs42_clone_file_range(struct file *src_file, loff_t src_off, |
199 | struct file *dst_file, loff_t dst_off, u64 count) | |
bea51b30 PT |
200 | { |
201 | struct inode *dst_inode = file_inode(dst_file); | |
811b7b85 | 202 | struct nfs_server *server = NFS_SERVER(dst_inode); |
04b38d60 | 203 | struct inode *src_inode = file_inode(src_file); |
811b7b85 | 204 | unsigned int bs = server->clone_blksize; |
21fad313 | 205 | bool same_inode = false; |
bea51b30 PT |
206 | int ret; |
207 | ||
811b7b85 PT |
208 | /* check alignment w.r.t. clone_blksize */ |
209 | ret = -EINVAL; | |
210 | if (bs) { | |
211 | if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs)) | |
04b38d60 | 212 | goto out; |
811b7b85 | 213 | if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count)) |
04b38d60 | 214 | goto out; |
811b7b85 PT |
215 | } |
216 | ||
04b38d60 CH |
217 | if (src_inode == dst_inode) |
218 | same_inode = true; | |
21fad313 | 219 | |
bea51b30 | 220 | /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */ |
21fad313 | 221 | if (same_inode) { |
5955102c | 222 | inode_lock(src_inode); |
21fad313 | 223 | } else if (dst_inode < src_inode) { |
5955102c AV |
224 | inode_lock_nested(dst_inode, I_MUTEX_PARENT); |
225 | inode_lock_nested(src_inode, I_MUTEX_CHILD); | |
bea51b30 | 226 | } else { |
5955102c AV |
227 | inode_lock_nested(src_inode, I_MUTEX_PARENT); |
228 | inode_lock_nested(dst_inode, I_MUTEX_CHILD); | |
bea51b30 PT |
229 | } |
230 | ||
231 | /* flush all pending writes on both src and dst so that server | |
232 | * has the latest data */ | |
233 | ret = nfs_sync_inode(src_inode); | |
234 | if (ret) | |
235 | goto out_unlock; | |
236 | ret = nfs_sync_inode(dst_inode); | |
237 | if (ret) | |
238 | goto out_unlock; | |
239 | ||
04b38d60 | 240 | ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count); |
bea51b30 PT |
241 | |
242 | /* truncate inode page cache of the dst range so that future reads can fetch | |
243 | * new data from server */ | |
244 | if (!ret) | |
245 | truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1); | |
246 | ||
247 | out_unlock: | |
21fad313 | 248 | if (same_inode) { |
5955102c | 249 | inode_unlock(src_inode); |
21fad313 | 250 | } else if (dst_inode < src_inode) { |
5955102c AV |
251 | inode_unlock(src_inode); |
252 | inode_unlock(dst_inode); | |
bea51b30 | 253 | } else { |
5955102c AV |
254 | inode_unlock(dst_inode); |
255 | inode_unlock(src_inode); | |
bea51b30 | 256 | } |
04b38d60 | 257 | out: |
bea51b30 PT |
258 | return ret; |
259 | } | |
6b7153da | 260 | #endif /* CONFIG_NFS_V4_2 */ |
bea51b30 | 261 | |
ce4ef7c0 | 262 | const struct file_operations nfs4_file_operations = { |
3aa2d199 | 263 | .read_iter = nfs_file_read, |
edaf4369 | 264 | .write_iter = nfs_file_write, |
ce4ef7c0 BS |
265 | .mmap = nfs_file_mmap, |
266 | .open = nfs4_file_open, | |
5445b1fb | 267 | .flush = nfs4_file_flush, |
ce4ef7c0 BS |
268 | .release = nfs_file_release, |
269 | .fsync = nfs4_file_fsync, | |
270 | .lock = nfs_lock, | |
271 | .flock = nfs_flock, | |
272 | .splice_read = nfs_file_splice_read, | |
4da54c21 | 273 | .splice_write = iter_file_splice_write, |
ce4ef7c0 | 274 | .check_flags = nfs_check_flags, |
1c994a09 | 275 | .setlease = simple_nosetlease, |
6b7153da CH |
276 | #ifdef CONFIG_NFS_V4_2 |
277 | .llseek = nfs4_file_llseek, | |
278 | .fallocate = nfs42_fallocate, | |
04b38d60 | 279 | .clone_file_range = nfs42_clone_file_range, |
6b7153da CH |
280 | #else |
281 | .llseek = nfs_file_llseek, | |
282 | #endif | |
ce4ef7c0 | 283 | }; |