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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * file.c | |
4 | * | |
5 | * Copyright (C) 1995, 1996 by Volker Lendecke | |
6 | * Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache | |
7 | * | |
8 | */ | |
9 | ||
b41f8b84 JP |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
7c0f6ba6 | 12 | #include <linux/uaccess.h> |
1da177e4 LT |
13 | |
14 | #include <linux/time.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/fcntl.h> | |
18 | #include <linux/stat.h> | |
19 | #include <linux/mm.h> | |
1da177e4 | 20 | #include <linux/vmalloc.h> |
e8edc6e0 | 21 | #include <linux/sched.h> |
1da177e4 | 22 | |
32c419d9 | 23 | #include "ncp_fs.h" |
1da177e4 | 24 | |
02c24a82 | 25 | static int ncp_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
1da177e4 | 26 | { |
3b49c9a1 | 27 | return file_write_and_wait_range(file, start, end); |
1da177e4 LT |
28 | } |
29 | ||
30 | /* | |
31 | * Open a file with the specified read/write mode. | |
32 | */ | |
33 | int ncp_make_open(struct inode *inode, int right) | |
34 | { | |
35 | int error; | |
36 | int access; | |
37 | ||
38 | error = -EINVAL; | |
39 | if (!inode) { | |
b41f8b84 | 40 | pr_err("%s: got NULL inode\n", __func__); |
1da177e4 LT |
41 | goto out; |
42 | } | |
43 | ||
d3b73ca1 | 44 | ncp_dbg(1, "opened=%d, volume # %u, dir entry # %u\n", |
1da177e4 LT |
45 | atomic_read(&NCP_FINFO(inode)->opened), |
46 | NCP_FINFO(inode)->volNumber, | |
47 | NCP_FINFO(inode)->dirEntNum); | |
48 | error = -EACCES; | |
8e3f9045 | 49 | mutex_lock(&NCP_FINFO(inode)->open_mutex); |
1da177e4 LT |
50 | if (!atomic_read(&NCP_FINFO(inode)->opened)) { |
51 | struct ncp_entry_info finfo; | |
52 | int result; | |
53 | ||
54 | /* tries max. rights */ | |
55 | finfo.access = O_RDWR; | |
56 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), | |
57 | inode, NULL, OC_MODE_OPEN, | |
58 | 0, AR_READ | AR_WRITE, &finfo); | |
59 | if (!result) | |
60 | goto update; | |
61 | /* RDWR did not succeeded, try readonly or writeonly as requested */ | |
62 | switch (right) { | |
63 | case O_RDONLY: | |
64 | finfo.access = O_RDONLY; | |
65 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), | |
66 | inode, NULL, OC_MODE_OPEN, | |
67 | 0, AR_READ, &finfo); | |
68 | break; | |
69 | case O_WRONLY: | |
70 | finfo.access = O_WRONLY; | |
71 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), | |
72 | inode, NULL, OC_MODE_OPEN, | |
73 | 0, AR_WRITE, &finfo); | |
74 | break; | |
75 | } | |
76 | if (result) { | |
e45ca8ba | 77 | ncp_vdbg("failed, result=%d\n", result); |
1da177e4 LT |
78 | goto out_unlock; |
79 | } | |
80 | /* | |
81 | * Update the inode information. | |
82 | */ | |
83 | update: | |
84 | ncp_update_inode(inode, &finfo); | |
85 | atomic_set(&NCP_FINFO(inode)->opened, 1); | |
86 | } | |
87 | ||
88 | access = NCP_FINFO(inode)->access; | |
e45ca8ba | 89 | ncp_vdbg("file open, access=%x\n", access); |
1da177e4 LT |
90 | if (access == right || access == O_RDWR) { |
91 | atomic_inc(&NCP_FINFO(inode)->opened); | |
92 | error = 0; | |
93 | } | |
94 | ||
95 | out_unlock: | |
8e3f9045 | 96 | mutex_unlock(&NCP_FINFO(inode)->open_mutex); |
1da177e4 LT |
97 | out: |
98 | return error; | |
99 | } | |
100 | ||
101 | static ssize_t | |
274a4886 | 102 | ncp_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1da177e4 | 103 | { |
274a4886 | 104 | struct file *file = iocb->ki_filp; |
a67f797d | 105 | struct inode *inode = file_inode(file); |
1da177e4 | 106 | size_t already_read = 0; |
274a4886 | 107 | off_t pos = iocb->ki_pos; |
1da177e4 LT |
108 | size_t bufsize; |
109 | int error; | |
274a4886 | 110 | void *freepage; |
1da177e4 LT |
111 | size_t freelen; |
112 | ||
a67f797d | 113 | ncp_dbg(1, "enter %pD2\n", file); |
1da177e4 | 114 | |
274a4886 | 115 | if (!iov_iter_count(to)) |
1da177e4 LT |
116 | return 0; |
117 | if (pos > inode->i_sb->s_maxbytes) | |
118 | return 0; | |
274a4886 | 119 | iov_iter_truncate(to, inode->i_sb->s_maxbytes - pos); |
1da177e4 LT |
120 | |
121 | error = ncp_make_open(inode, O_RDONLY); | |
122 | if (error) { | |
d3b73ca1 | 123 | ncp_dbg(1, "open failed, error=%d\n", error); |
1da177e4 LT |
124 | return error; |
125 | } | |
126 | ||
127 | bufsize = NCP_SERVER(inode)->buffer_size; | |
128 | ||
129 | error = -EIO; | |
130 | freelen = ncp_read_bounce_size(bufsize); | |
131 | freepage = vmalloc(freelen); | |
132 | if (!freepage) | |
133 | goto outrel; | |
134 | error = 0; | |
135 | /* First read in as much as possible for each bufsize. */ | |
274a4886 | 136 | while (iov_iter_count(to)) { |
1da177e4 | 137 | int read_this_time; |
274a4886 | 138 | size_t to_read = min_t(size_t, |
1da177e4 | 139 | bufsize - (pos % bufsize), |
274a4886 | 140 | iov_iter_count(to)); |
1da177e4 LT |
141 | |
142 | error = ncp_read_bounce(NCP_SERVER(inode), | |
143 | NCP_FINFO(inode)->file_handle, | |
274a4886 | 144 | pos, to_read, to, &read_this_time, |
1da177e4 LT |
145 | freepage, freelen); |
146 | if (error) { | |
147 | error = -EIO; /* NW errno -> Linux errno */ | |
148 | break; | |
149 | } | |
150 | pos += read_this_time; | |
1da177e4 LT |
151 | already_read += read_this_time; |
152 | ||
274a4886 | 153 | if (read_this_time != to_read) |
1da177e4 | 154 | break; |
1da177e4 LT |
155 | } |
156 | vfree(freepage); | |
157 | ||
274a4886 | 158 | iocb->ki_pos = pos; |
1da177e4 LT |
159 | |
160 | file_accessed(file); | |
161 | ||
a67f797d | 162 | ncp_dbg(1, "exit %pD2\n", file); |
1da177e4 LT |
163 | outrel: |
164 | ncp_inode_close(inode); | |
165 | return already_read ? already_read : error; | |
166 | } | |
167 | ||
168 | static ssize_t | |
274a4886 | 169 | ncp_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 170 | { |
274a4886 | 171 | struct file *file = iocb->ki_filp; |
a67f797d | 172 | struct inode *inode = file_inode(file); |
1da177e4 | 173 | size_t already_written = 0; |
1da177e4 LT |
174 | size_t bufsize; |
175 | int errno; | |
274a4886 | 176 | void *bouncebuffer; |
3309dd04 | 177 | off_t pos; |
1da177e4 | 178 | |
a67f797d | 179 | ncp_dbg(1, "enter %pD2\n", file); |
3309dd04 AV |
180 | errno = generic_write_checks(iocb, from); |
181 | if (errno <= 0) | |
274a4886 | 182 | return errno; |
274a4886 | 183 | |
1da177e4 LT |
184 | errno = ncp_make_open(inode, O_WRONLY); |
185 | if (errno) { | |
d3b73ca1 | 186 | ncp_dbg(1, "open failed, error=%d\n", errno); |
1da177e4 LT |
187 | return errno; |
188 | } | |
189 | bufsize = NCP_SERVER(inode)->buffer_size; | |
190 | ||
c3b2da31 JB |
191 | errno = file_update_time(file); |
192 | if (errno) | |
193 | goto outrel; | |
194 | ||
1da177e4 LT |
195 | bouncebuffer = vmalloc(bufsize); |
196 | if (!bouncebuffer) { | |
197 | errno = -EIO; /* -ENOMEM */ | |
198 | goto outrel; | |
199 | } | |
3309dd04 | 200 | pos = iocb->ki_pos; |
274a4886 | 201 | while (iov_iter_count(from)) { |
1da177e4 | 202 | int written_this_time; |
274a4886 | 203 | size_t to_write = min_t(size_t, |
3309dd04 | 204 | bufsize - (pos % bufsize), |
274a4886 | 205 | iov_iter_count(from)); |
1da177e4 | 206 | |
cbbd26b8 | 207 | if (!copy_from_iter_full(bouncebuffer, to_write, from)) { |
1da177e4 LT |
208 | errno = -EFAULT; |
209 | break; | |
210 | } | |
211 | if (ncp_write_kernel(NCP_SERVER(inode), | |
212 | NCP_FINFO(inode)->file_handle, | |
213 | pos, to_write, bouncebuffer, &written_this_time) != 0) { | |
214 | errno = -EIO; | |
215 | break; | |
216 | } | |
217 | pos += written_this_time; | |
1da177e4 LT |
218 | already_written += written_this_time; |
219 | ||
274a4886 | 220 | if (written_this_time != to_write) |
1da177e4 | 221 | break; |
1da177e4 LT |
222 | } |
223 | vfree(bouncebuffer); | |
224 | ||
274a4886 | 225 | iocb->ki_pos = pos; |
1da177e4 | 226 | |
2e54eb96 | 227 | if (pos > i_size_read(inode)) { |
5955102c | 228 | inode_lock(inode); |
2e54eb96 PV |
229 | if (pos > i_size_read(inode)) |
230 | i_size_write(inode, pos); | |
5955102c | 231 | inode_unlock(inode); |
1da177e4 | 232 | } |
a67f797d | 233 | ncp_dbg(1, "exit %pD2\n", file); |
1da177e4 LT |
234 | outrel: |
235 | ncp_inode_close(inode); | |
236 | return already_written ? already_written : errno; | |
237 | } | |
238 | ||
239 | static int ncp_release(struct inode *inode, struct file *file) { | |
240 | if (ncp_make_closed(inode)) { | |
d3b73ca1 | 241 | ncp_dbg(1, "failed to close\n"); |
1da177e4 LT |
242 | } |
243 | return 0; | |
244 | } | |
245 | ||
4b6f5d20 | 246 | const struct file_operations ncp_file_operations = |
1da177e4 | 247 | { |
2e54eb96 | 248 | .llseek = generic_file_llseek, |
274a4886 AV |
249 | .read_iter = ncp_file_read_iter, |
250 | .write_iter = ncp_file_write_iter, | |
93d84b6d | 251 | .unlocked_ioctl = ncp_ioctl, |
54f67f63 PV |
252 | #ifdef CONFIG_COMPAT |
253 | .compat_ioctl = ncp_compat_ioctl, | |
254 | #endif | |
1da177e4 LT |
255 | .mmap = ncp_mmap, |
256 | .release = ncp_release, | |
257 | .fsync = ncp_fsync, | |
258 | }; | |
259 | ||
92e1d5be | 260 | const struct inode_operations ncp_file_inode_operations = |
1da177e4 LT |
261 | { |
262 | .setattr = ncp_notify_change, | |
263 | }; |