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1 | /* | |
2 | * linux/fs/nfs/file.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | */ | |
6 | #include <linux/fs.h> | |
7 | #include <linux/falloc.h> | |
8 | #include <linux/nfs_fs.h> | |
9 | #include "internal.h" | |
10 | #include "fscache.h" | |
11 | #include "pnfs.h" | |
12 | ||
13 | #ifdef CONFIG_NFS_V4_2 | |
14 | #include "nfs42.h" | |
15 | #endif | |
16 | ||
17 | #define NFSDBG_FACILITY NFSDBG_FILE | |
18 | ||
19 | static int | |
20 | nfs4_file_open(struct inode *inode, struct file *filp) | |
21 | { | |
22 | struct nfs_open_context *ctx; | |
23 | struct dentry *dentry = filp->f_path.dentry; | |
24 | struct dentry *parent = NULL; | |
25 | struct inode *dir; | |
26 | unsigned openflags = filp->f_flags; | |
27 | struct iattr attr; | |
28 | int opened = 0; | |
29 | int err; | |
30 | ||
31 | /* | |
32 | * If no cached dentry exists or if it's negative, NFSv4 handled the | |
33 | * opens in ->lookup() or ->create(). | |
34 | * | |
35 | * We only get this far for a cached positive dentry. We skipped | |
36 | * revalidation, so handle it here by dropping the dentry and returning | |
37 | * -EOPENSTALE. The VFS will retry the lookup/create/open. | |
38 | */ | |
39 | ||
40 | dprintk("NFS: open file(%pd2)\n", dentry); | |
41 | ||
42 | if ((openflags & O_ACCMODE) == 3) | |
43 | openflags--; | |
44 | ||
45 | /* We can't create new files here */ | |
46 | openflags &= ~(O_CREAT|O_EXCL); | |
47 | ||
48 | parent = dget_parent(dentry); | |
49 | dir = parent->d_inode; | |
50 | ||
51 | ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode); | |
52 | err = PTR_ERR(ctx); | |
53 | if (IS_ERR(ctx)) | |
54 | goto out; | |
55 | ||
56 | attr.ia_valid = ATTR_OPEN; | |
57 | if (openflags & O_TRUNC) { | |
58 | attr.ia_valid |= ATTR_SIZE; | |
59 | attr.ia_size = 0; | |
60 | nfs_wb_all(inode); | |
61 | } | |
62 | ||
63 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, &opened); | |
64 | if (IS_ERR(inode)) { | |
65 | err = PTR_ERR(inode); | |
66 | switch (err) { | |
67 | case -EPERM: | |
68 | case -EACCES: | |
69 | case -EDQUOT: | |
70 | case -ENOSPC: | |
71 | case -EROFS: | |
72 | goto out_put_ctx; | |
73 | default: | |
74 | goto out_drop; | |
75 | } | |
76 | } | |
77 | if (inode != dentry->d_inode) | |
78 | goto out_drop; | |
79 | ||
80 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
81 | nfs_file_set_open_context(filp, ctx); | |
82 | nfs_fscache_open_file(inode, filp); | |
83 | err = 0; | |
84 | ||
85 | out_put_ctx: | |
86 | put_nfs_open_context(ctx); | |
87 | out: | |
88 | dput(parent); | |
89 | return err; | |
90 | ||
91 | out_drop: | |
92 | d_drop(dentry); | |
93 | err = -EOPENSTALE; | |
94 | goto out_put_ctx; | |
95 | } | |
96 | ||
97 | static int | |
98 | nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) | |
99 | { | |
100 | int ret; | |
101 | struct inode *inode = file_inode(file); | |
102 | ||
103 | do { | |
104 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
105 | if (ret != 0) | |
106 | break; | |
107 | mutex_lock(&inode->i_mutex); | |
108 | ret = nfs_file_fsync_commit(file, start, end, datasync); | |
109 | if (!ret) | |
110 | ret = pnfs_layoutcommit_inode(inode, true); | |
111 | mutex_unlock(&inode->i_mutex); | |
112 | /* | |
113 | * If nfs_file_fsync_commit detected a server reboot, then | |
114 | * resend all dirty pages that might have been covered by | |
115 | * the NFS_CONTEXT_RESEND_WRITES flag | |
116 | */ | |
117 | start = 0; | |
118 | end = LLONG_MAX; | |
119 | } while (ret == -EAGAIN); | |
120 | ||
121 | return ret; | |
122 | } | |
123 | ||
124 | #ifdef CONFIG_NFS_V4_2 | |
125 | static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence) | |
126 | { | |
127 | loff_t ret; | |
128 | ||
129 | switch (whence) { | |
130 | case SEEK_HOLE: | |
131 | case SEEK_DATA: | |
132 | ret = nfs42_proc_llseek(filep, offset, whence); | |
133 | if (ret != -ENOTSUPP) | |
134 | return ret; | |
135 | default: | |
136 | return nfs_file_llseek(filep, offset, whence); | |
137 | } | |
138 | } | |
139 | ||
140 | static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len) | |
141 | { | |
142 | struct inode *inode = file_inode(filep); | |
143 | long ret; | |
144 | ||
145 | if (!S_ISREG(inode->i_mode)) | |
146 | return -EOPNOTSUPP; | |
147 | ||
148 | if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))) | |
149 | return -EOPNOTSUPP; | |
150 | ||
151 | ret = inode_newsize_ok(inode, offset + len); | |
152 | if (ret < 0) | |
153 | return ret; | |
154 | ||
155 | mutex_lock(&inode->i_mutex); | |
156 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
157 | ret = nfs42_proc_deallocate(filep, offset, len); | |
158 | else | |
159 | ret = nfs42_proc_allocate(filep, offset, len); | |
160 | mutex_unlock(&inode->i_mutex); | |
161 | ||
162 | nfs_zap_caches(inode); | |
163 | return ret; | |
164 | } | |
165 | #endif /* CONFIG_NFS_V4_2 */ | |
166 | ||
167 | const struct file_operations nfs4_file_operations = { | |
168 | #ifdef CONFIG_NFS_V4_2 | |
169 | .llseek = nfs4_file_llseek, | |
170 | #else | |
171 | .llseek = nfs_file_llseek, | |
172 | #endif | |
173 | .read = new_sync_read, | |
174 | .write = new_sync_write, | |
175 | .read_iter = nfs_file_read, | |
176 | .write_iter = nfs_file_write, | |
177 | .mmap = nfs_file_mmap, | |
178 | .open = nfs4_file_open, | |
179 | .flush = nfs_file_flush, | |
180 | .release = nfs_file_release, | |
181 | .fsync = nfs4_file_fsync, | |
182 | .lock = nfs_lock, | |
183 | .flock = nfs_flock, | |
184 | .splice_read = nfs_file_splice_read, | |
185 | .splice_write = iter_file_splice_write, | |
186 | #ifdef CONFIG_NFS_V4_2 | |
187 | .fallocate = nfs42_fallocate, | |
188 | #endif /* CONFIG_NFS_V4_2 */ | |
189 | .check_flags = nfs_check_flags, | |
190 | .setlease = simple_nosetlease, | |
191 | }; |