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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
690c5e31 | 35 | #include <linux/swap.h> |
1da177e4 LT |
36 | #include <asm/div64.h> |
37 | #include "cifsfs.h" | |
38 | #include "cifspdu.h" | |
39 | #include "cifsglob.h" | |
40 | #include "cifsproto.h" | |
41 | #include "cifs_unicode.h" | |
42 | #include "cifs_debug.h" | |
43 | #include "cifs_fs_sb.h" | |
9451a9a5 | 44 | #include "fscache.h" |
1da177e4 | 45 | |
1da177e4 LT |
46 | static inline int cifs_convert_flags(unsigned int flags) |
47 | { | |
48 | if ((flags & O_ACCMODE) == O_RDONLY) | |
49 | return GENERIC_READ; | |
50 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
51 | return GENERIC_WRITE; | |
52 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
53 | /* GENERIC_ALL is too much permission to request | |
54 | can cause unnecessary access denied on create */ | |
55 | /* return GENERIC_ALL; */ | |
56 | return (GENERIC_READ | GENERIC_WRITE); | |
57 | } | |
58 | ||
e10f7b55 JL |
59 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
60 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
61 | FILE_READ_DATA); | |
7fc8f4e9 | 62 | } |
e10f7b55 | 63 | |
608712fe | 64 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 65 | { |
608712fe | 66 | u32 posix_flags = 0; |
e10f7b55 | 67 | |
7fc8f4e9 | 68 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 69 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 70 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
71 | posix_flags = SMB_O_WRONLY; |
72 | else if ((flags & O_ACCMODE) == O_RDWR) | |
73 | posix_flags = SMB_O_RDWR; | |
74 | ||
75 | if (flags & O_CREAT) | |
76 | posix_flags |= SMB_O_CREAT; | |
77 | if (flags & O_EXCL) | |
78 | posix_flags |= SMB_O_EXCL; | |
79 | if (flags & O_TRUNC) | |
80 | posix_flags |= SMB_O_TRUNC; | |
81 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 82 | if (flags & O_DSYNC) |
608712fe | 83 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 84 | if (flags & O_DIRECTORY) |
608712fe | 85 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 86 | if (flags & O_NOFOLLOW) |
608712fe | 87 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 88 | if (flags & O_DIRECT) |
608712fe | 89 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
90 | |
91 | return posix_flags; | |
1da177e4 LT |
92 | } |
93 | ||
94 | static inline int cifs_get_disposition(unsigned int flags) | |
95 | { | |
96 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
97 | return FILE_CREATE; | |
98 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
99 | return FILE_OVERWRITE_IF; | |
100 | else if ((flags & O_CREAT) == O_CREAT) | |
101 | return FILE_OPEN_IF; | |
55aa2e09 SF |
102 | else if ((flags & O_TRUNC) == O_TRUNC) |
103 | return FILE_OVERWRITE; | |
1da177e4 LT |
104 | else |
105 | return FILE_OPEN; | |
106 | } | |
107 | ||
608712fe JL |
108 | int cifs_posix_open(char *full_path, struct inode **pinode, |
109 | struct super_block *sb, int mode, unsigned int f_flags, | |
110 | __u32 *poplock, __u16 *pnetfid, int xid) | |
111 | { | |
112 | int rc; | |
113 | FILE_UNIX_BASIC_INFO *presp_data; | |
114 | __u32 posix_flags = 0; | |
115 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
116 | struct cifs_fattr fattr; | |
117 | struct tcon_link *tlink; | |
96daf2b0 | 118 | struct cifs_tcon *tcon; |
608712fe JL |
119 | |
120 | cFYI(1, "posix open %s", full_path); | |
121 | ||
122 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
123 | if (presp_data == NULL) | |
124 | return -ENOMEM; | |
125 | ||
126 | tlink = cifs_sb_tlink(cifs_sb); | |
127 | if (IS_ERR(tlink)) { | |
128 | rc = PTR_ERR(tlink); | |
129 | goto posix_open_ret; | |
130 | } | |
131 | ||
132 | tcon = tlink_tcon(tlink); | |
133 | mode &= ~current_umask(); | |
134 | ||
135 | posix_flags = cifs_posix_convert_flags(f_flags); | |
136 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
137 | poplock, full_path, cifs_sb->local_nls, | |
138 | cifs_sb->mnt_cifs_flags & | |
139 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
140 | cifs_put_tlink(tlink); | |
141 | ||
142 | if (rc) | |
143 | goto posix_open_ret; | |
144 | ||
145 | if (presp_data->Type == cpu_to_le32(-1)) | |
146 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
147 | ||
148 | if (!pinode) | |
149 | goto posix_open_ret; /* caller does not need info */ | |
150 | ||
151 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
152 | ||
153 | /* get new inode and set it up */ | |
154 | if (*pinode == NULL) { | |
155 | cifs_fill_uniqueid(sb, &fattr); | |
156 | *pinode = cifs_iget(sb, &fattr); | |
157 | if (!*pinode) { | |
158 | rc = -ENOMEM; | |
159 | goto posix_open_ret; | |
160 | } | |
161 | } else { | |
162 | cifs_fattr_to_inode(*pinode, &fattr); | |
163 | } | |
164 | ||
165 | posix_open_ret: | |
166 | kfree(presp_data); | |
167 | return rc; | |
168 | } | |
169 | ||
eeb910a6 PS |
170 | static int |
171 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
96daf2b0 | 172 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *poplock, |
eeb910a6 PS |
173 | __u16 *pnetfid, int xid) |
174 | { | |
175 | int rc; | |
176 | int desiredAccess; | |
177 | int disposition; | |
3d3ea8e6 | 178 | int create_options = CREATE_NOT_DIR; |
eeb910a6 PS |
179 | FILE_ALL_INFO *buf; |
180 | ||
181 | desiredAccess = cifs_convert_flags(f_flags); | |
182 | ||
183 | /********************************************************************* | |
184 | * open flag mapping table: | |
185 | * | |
186 | * POSIX Flag CIFS Disposition | |
187 | * ---------- ---------------- | |
188 | * O_CREAT FILE_OPEN_IF | |
189 | * O_CREAT | O_EXCL FILE_CREATE | |
190 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
191 | * O_TRUNC FILE_OVERWRITE | |
192 | * none of the above FILE_OPEN | |
193 | * | |
194 | * Note that there is not a direct match between disposition | |
195 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
196 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
197 | * file rather than creating a new file as FILE_SUPERSEDE does | |
198 | * (which uses the attributes / metadata passed in on open call) | |
199 | *? | |
200 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
201 | *? and the read write flags match reasonably. O_LARGEFILE | |
202 | *? is irrelevant because largefile support is always used | |
203 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
204 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
205 | *********************************************************************/ | |
206 | ||
207 | disposition = cifs_get_disposition(f_flags); | |
208 | ||
209 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
210 | ||
211 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
212 | if (!buf) | |
213 | return -ENOMEM; | |
214 | ||
3d3ea8e6 SP |
215 | if (backup_cred(cifs_sb)) |
216 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
217 | ||
eeb910a6 PS |
218 | if (tcon->ses->capabilities & CAP_NT_SMBS) |
219 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, | |
3d3ea8e6 | 220 | desiredAccess, create_options, pnetfid, poplock, buf, |
eeb910a6 PS |
221 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
222 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
223 | else | |
224 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, | |
225 | desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf, | |
226 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
227 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
228 | ||
229 | if (rc) | |
230 | goto out; | |
231 | ||
232 | if (tcon->unix_ext) | |
233 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
234 | xid); | |
235 | else | |
236 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
237 | xid, pnetfid); | |
238 | ||
239 | out: | |
240 | kfree(buf); | |
241 | return rc; | |
242 | } | |
243 | ||
15ecb436 JL |
244 | struct cifsFileInfo * |
245 | cifs_new_fileinfo(__u16 fileHandle, struct file *file, | |
246 | struct tcon_link *tlink, __u32 oplock) | |
247 | { | |
248 | struct dentry *dentry = file->f_path.dentry; | |
249 | struct inode *inode = dentry->d_inode; | |
250 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); | |
251 | struct cifsFileInfo *pCifsFile; | |
252 | ||
253 | pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
254 | if (pCifsFile == NULL) | |
255 | return pCifsFile; | |
256 | ||
5f6dbc9e | 257 | pCifsFile->count = 1; |
15ecb436 JL |
258 | pCifsFile->netfid = fileHandle; |
259 | pCifsFile->pid = current->tgid; | |
260 | pCifsFile->uid = current_fsuid(); | |
261 | pCifsFile->dentry = dget(dentry); | |
262 | pCifsFile->f_flags = file->f_flags; | |
263 | pCifsFile->invalidHandle = false; | |
15ecb436 JL |
264 | pCifsFile->tlink = cifs_get_tlink(tlink); |
265 | mutex_init(&pCifsFile->fh_mutex); | |
15ecb436 JL |
266 | INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); |
267 | ||
4477288a | 268 | spin_lock(&cifs_file_list_lock); |
15ecb436 JL |
269 | list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList)); |
270 | /* if readable file instance put first in list*/ | |
271 | if (file->f_mode & FMODE_READ) | |
272 | list_add(&pCifsFile->flist, &pCifsInode->openFileList); | |
273 | else | |
274 | list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList); | |
4477288a | 275 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 276 | |
c6723628 | 277 | cifs_set_oplock_level(pCifsInode, oplock); |
85160e03 | 278 | pCifsInode->can_cache_brlcks = pCifsInode->clientCanCacheAll; |
15ecb436 JL |
279 | |
280 | file->private_data = pCifsFile; | |
281 | return pCifsFile; | |
282 | } | |
283 | ||
85160e03 PS |
284 | static void cifs_del_lock_waiters(struct cifsLockInfo *lock); |
285 | ||
cdff08e7 SF |
286 | /* |
287 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
288 | * the filehandle out on the server. Must be called without holding |
289 | * cifs_file_list_lock. | |
cdff08e7 | 290 | */ |
b33879aa JL |
291 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
292 | { | |
e66673e3 | 293 | struct inode *inode = cifs_file->dentry->d_inode; |
96daf2b0 | 294 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
e66673e3 | 295 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
4f8ba8a0 | 296 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
cdff08e7 SF |
297 | struct cifsLockInfo *li, *tmp; |
298 | ||
299 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 300 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
301 | spin_unlock(&cifs_file_list_lock); |
302 | return; | |
303 | } | |
304 | ||
305 | /* remove it from the lists */ | |
306 | list_del(&cifs_file->flist); | |
307 | list_del(&cifs_file->tlist); | |
308 | ||
309 | if (list_empty(&cifsi->openFileList)) { | |
310 | cFYI(1, "closing last open instance for inode %p", | |
311 | cifs_file->dentry->d_inode); | |
4f8ba8a0 PS |
312 | |
313 | /* in strict cache mode we need invalidate mapping on the last | |
314 | close because it may cause a error when we open this file | |
315 | again and get at least level II oplock */ | |
316 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) | |
317 | CIFS_I(inode)->invalid_mapping = true; | |
318 | ||
c6723628 | 319 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
320 | } |
321 | spin_unlock(&cifs_file_list_lock); | |
322 | ||
ad635942 JL |
323 | cancel_work_sync(&cifs_file->oplock_break); |
324 | ||
cdff08e7 SF |
325 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
326 | int xid, rc; | |
327 | ||
328 | xid = GetXid(); | |
329 | rc = CIFSSMBClose(xid, tcon, cifs_file->netfid); | |
330 | FreeXid(xid); | |
331 | } | |
332 | ||
333 | /* Delete any outstanding lock records. We'll lose them when the file | |
334 | * is closed anyway. | |
335 | */ | |
d59dad2b PS |
336 | mutex_lock(&cifsi->lock_mutex); |
337 | list_for_each_entry_safe(li, tmp, &cifsi->llist, llist) { | |
338 | if (li->netfid != cifs_file->netfid) | |
339 | continue; | |
cdff08e7 | 340 | list_del(&li->llist); |
85160e03 | 341 | cifs_del_lock_waiters(li); |
cdff08e7 | 342 | kfree(li); |
b33879aa | 343 | } |
d59dad2b | 344 | mutex_unlock(&cifsi->lock_mutex); |
cdff08e7 SF |
345 | |
346 | cifs_put_tlink(cifs_file->tlink); | |
347 | dput(cifs_file->dentry); | |
348 | kfree(cifs_file); | |
b33879aa JL |
349 | } |
350 | ||
1da177e4 LT |
351 | int cifs_open(struct inode *inode, struct file *file) |
352 | { | |
353 | int rc = -EACCES; | |
590a3fe0 JL |
354 | int xid; |
355 | __u32 oplock; | |
1da177e4 | 356 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 357 | struct cifs_tcon *tcon; |
7ffec372 | 358 | struct tcon_link *tlink; |
6ca9f3ba | 359 | struct cifsFileInfo *pCifsFile = NULL; |
1da177e4 | 360 | char *full_path = NULL; |
7e12eddb | 361 | bool posix_open_ok = false; |
1da177e4 | 362 | __u16 netfid; |
1da177e4 LT |
363 | |
364 | xid = GetXid(); | |
365 | ||
366 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
367 | tlink = cifs_sb_tlink(cifs_sb); |
368 | if (IS_ERR(tlink)) { | |
369 | FreeXid(xid); | |
370 | return PTR_ERR(tlink); | |
371 | } | |
372 | tcon = tlink_tcon(tlink); | |
1da177e4 | 373 | |
e6a00296 | 374 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 375 | if (full_path == NULL) { |
0f3bc09e | 376 | rc = -ENOMEM; |
232341ba | 377 | goto out; |
1da177e4 LT |
378 | } |
379 | ||
b6b38f70 JP |
380 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
381 | inode, file->f_flags, full_path); | |
276a74a4 | 382 | |
e7504734 | 383 | if (enable_oplocks) |
276a74a4 SF |
384 | oplock = REQ_OPLOCK; |
385 | else | |
386 | oplock = 0; | |
387 | ||
64cc2c63 SF |
388 | if (!tcon->broken_posix_open && tcon->unix_ext && |
389 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
390 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
391 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 392 | /* can not refresh inode info since size could be stale */ |
2422f676 | 393 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 394 | cifs_sb->mnt_file_mode /* ignored */, |
608712fe | 395 | file->f_flags, &oplock, &netfid, xid); |
276a74a4 | 396 | if (rc == 0) { |
b6b38f70 | 397 | cFYI(1, "posix open succeeded"); |
7e12eddb | 398 | posix_open_ok = true; |
64cc2c63 SF |
399 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
400 | if (tcon->ses->serverNOS) | |
b6b38f70 | 401 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
402 | " unexpected error on SMB posix open" |
403 | ", disabling posix open support." | |
404 | " Check if server update available.", | |
405 | tcon->ses->serverName, | |
b6b38f70 | 406 | tcon->ses->serverNOS); |
64cc2c63 | 407 | tcon->broken_posix_open = true; |
276a74a4 SF |
408 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
409 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
410 | goto out; | |
64cc2c63 SF |
411 | /* else fallthrough to retry open the old way on network i/o |
412 | or DFS errors */ | |
276a74a4 SF |
413 | } |
414 | ||
7e12eddb PS |
415 | if (!posix_open_ok) { |
416 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, | |
417 | file->f_flags, &oplock, &netfid, xid); | |
418 | if (rc) | |
419 | goto out; | |
420 | } | |
47c78b7f | 421 | |
abfe1eed | 422 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); |
6ca9f3ba | 423 | if (pCifsFile == NULL) { |
7e12eddb | 424 | CIFSSMBClose(xid, tcon, netfid); |
1da177e4 LT |
425 | rc = -ENOMEM; |
426 | goto out; | |
427 | } | |
1da177e4 | 428 | |
9451a9a5 SJ |
429 | cifs_fscache_set_inode_cookie(inode, file); |
430 | ||
7e12eddb | 431 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
1da177e4 LT |
432 | /* time to set mode which we can not set earlier due to |
433 | problems creating new read-only files */ | |
7e12eddb PS |
434 | struct cifs_unix_set_info_args args = { |
435 | .mode = inode->i_mode, | |
436 | .uid = NO_CHANGE_64, | |
437 | .gid = NO_CHANGE_64, | |
438 | .ctime = NO_CHANGE_64, | |
439 | .atime = NO_CHANGE_64, | |
440 | .mtime = NO_CHANGE_64, | |
441 | .device = 0, | |
442 | }; | |
d44a9fe2 JL |
443 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, netfid, |
444 | pCifsFile->pid); | |
1da177e4 LT |
445 | } |
446 | ||
447 | out: | |
1da177e4 LT |
448 | kfree(full_path); |
449 | FreeXid(xid); | |
7ffec372 | 450 | cifs_put_tlink(tlink); |
1da177e4 LT |
451 | return rc; |
452 | } | |
453 | ||
0418726b | 454 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
455 | /* to server was lost */ |
456 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
457 | { | |
458 | int rc = 0; | |
459 | ||
460 | /* BB list all locks open on this file and relock */ | |
461 | ||
462 | return rc; | |
463 | } | |
464 | ||
15886177 | 465 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
1da177e4 LT |
466 | { |
467 | int rc = -EACCES; | |
590a3fe0 JL |
468 | int xid; |
469 | __u32 oplock; | |
1da177e4 | 470 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 471 | struct cifs_tcon *tcon; |
1da177e4 | 472 | struct cifsInodeInfo *pCifsInode; |
fb8c4b14 | 473 | struct inode *inode; |
1da177e4 LT |
474 | char *full_path = NULL; |
475 | int desiredAccess; | |
476 | int disposition = FILE_OPEN; | |
3d3ea8e6 | 477 | int create_options = CREATE_NOT_DIR; |
1da177e4 LT |
478 | __u16 netfid; |
479 | ||
1da177e4 | 480 | xid = GetXid(); |
f0a71eb8 | 481 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 482 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 483 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 484 | rc = 0; |
1da177e4 | 485 | FreeXid(xid); |
0f3bc09e | 486 | return rc; |
1da177e4 LT |
487 | } |
488 | ||
15886177 | 489 | inode = pCifsFile->dentry->d_inode; |
1da177e4 | 490 | cifs_sb = CIFS_SB(inode->i_sb); |
13cfb733 | 491 | tcon = tlink_tcon(pCifsFile->tlink); |
3a9f462f | 492 | |
1da177e4 LT |
493 | /* can not grab rename sem here because various ops, including |
494 | those that already have the rename sem can end up causing writepage | |
495 | to get called and if the server was down that means we end up here, | |
496 | and we can never tell if the caller already has the rename_sem */ | |
15886177 | 497 | full_path = build_path_from_dentry(pCifsFile->dentry); |
1da177e4 | 498 | if (full_path == NULL) { |
3a9f462f | 499 | rc = -ENOMEM; |
f0a71eb8 | 500 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 501 | FreeXid(xid); |
3a9f462f | 502 | return rc; |
1da177e4 LT |
503 | } |
504 | ||
b6b38f70 | 505 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
15886177 | 506 | inode, pCifsFile->f_flags, full_path); |
1da177e4 | 507 | |
e7504734 | 508 | if (enable_oplocks) |
1da177e4 LT |
509 | oplock = REQ_OPLOCK; |
510 | else | |
4b18f2a9 | 511 | oplock = 0; |
1da177e4 | 512 | |
7fc8f4e9 SF |
513 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
514 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
515 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
608712fe JL |
516 | |
517 | /* | |
518 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
519 | * original open. Must mask them off for a reopen. | |
520 | */ | |
15886177 JL |
521 | unsigned int oflags = pCifsFile->f_flags & |
522 | ~(O_CREAT | O_EXCL | O_TRUNC); | |
608712fe | 523 | |
2422f676 | 524 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
525 | cifs_sb->mnt_file_mode /* ignored */, |
526 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 527 | if (rc == 0) { |
b6b38f70 | 528 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
529 | goto reopen_success; |
530 | } | |
531 | /* fallthrough to retry open the old way on errors, especially | |
532 | in the reconnect path it is important to retry hard */ | |
533 | } | |
534 | ||
15886177 | 535 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
7fc8f4e9 | 536 | |
3d3ea8e6 SP |
537 | if (backup_cred(cifs_sb)) |
538 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
539 | ||
1da177e4 | 540 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
541 | by SMBOpen and then calling get_inode_info with returned buf |
542 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
543 | and server version of file size can be stale. If we knew for sure |
544 | that inode was not dirty locally we could do this */ | |
545 | ||
7fc8f4e9 | 546 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
3d3ea8e6 | 547 | create_options, &netfid, &oplock, NULL, |
fb8c4b14 | 548 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 549 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 550 | if (rc) { |
f0a71eb8 | 551 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
552 | cFYI(1, "cifs_open returned 0x%x", rc); |
553 | cFYI(1, "oplock: %d", oplock); | |
15886177 JL |
554 | goto reopen_error_exit; |
555 | } | |
556 | ||
7fc8f4e9 | 557 | reopen_success: |
15886177 JL |
558 | pCifsFile->netfid = netfid; |
559 | pCifsFile->invalidHandle = false; | |
560 | mutex_unlock(&pCifsFile->fh_mutex); | |
561 | pCifsInode = CIFS_I(inode); | |
562 | ||
563 | if (can_flush) { | |
564 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 565 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 566 | |
15886177 JL |
567 | if (tcon->unix_ext) |
568 | rc = cifs_get_inode_info_unix(&inode, | |
569 | full_path, inode->i_sb, xid); | |
570 | else | |
571 | rc = cifs_get_inode_info(&inode, | |
572 | full_path, NULL, inode->i_sb, | |
573 | xid, NULL); | |
574 | } /* else we are writing out data to server already | |
575 | and could deadlock if we tried to flush data, and | |
576 | since we do not know if we have data that would | |
577 | invalidate the current end of file on the server | |
578 | we can not go to the server to get the new inod | |
579 | info */ | |
e66673e3 | 580 | |
c6723628 | 581 | cifs_set_oplock_level(pCifsInode, oplock); |
e66673e3 | 582 | |
15886177 JL |
583 | cifs_relock_file(pCifsFile); |
584 | ||
585 | reopen_error_exit: | |
1da177e4 LT |
586 | kfree(full_path); |
587 | FreeXid(xid); | |
588 | return rc; | |
589 | } | |
590 | ||
591 | int cifs_close(struct inode *inode, struct file *file) | |
592 | { | |
77970693 JL |
593 | if (file->private_data != NULL) { |
594 | cifsFileInfo_put(file->private_data); | |
595 | file->private_data = NULL; | |
596 | } | |
7ee1af76 | 597 | |
cdff08e7 SF |
598 | /* return code from the ->release op is always ignored */ |
599 | return 0; | |
1da177e4 LT |
600 | } |
601 | ||
602 | int cifs_closedir(struct inode *inode, struct file *file) | |
603 | { | |
604 | int rc = 0; | |
605 | int xid; | |
c21dfb69 | 606 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
607 | char *ptmp; |
608 | ||
b6b38f70 | 609 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
610 | |
611 | xid = GetXid(); | |
612 | ||
613 | if (pCFileStruct) { | |
96daf2b0 | 614 | struct cifs_tcon *pTcon = tlink_tcon(pCFileStruct->tlink); |
1da177e4 | 615 | |
b6b38f70 | 616 | cFYI(1, "Freeing private data in close dir"); |
4477288a | 617 | spin_lock(&cifs_file_list_lock); |
4b18f2a9 SF |
618 | if (!pCFileStruct->srch_inf.endOfSearch && |
619 | !pCFileStruct->invalidHandle) { | |
620 | pCFileStruct->invalidHandle = true; | |
4477288a | 621 | spin_unlock(&cifs_file_list_lock); |
1da177e4 | 622 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
623 | cFYI(1, "Closing uncompleted readdir with rc %d", |
624 | rc); | |
1da177e4 LT |
625 | /* not much we can do if it fails anyway, ignore rc */ |
626 | rc = 0; | |
ddb4cbfc | 627 | } else |
4477288a | 628 | spin_unlock(&cifs_file_list_lock); |
1da177e4 LT |
629 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
630 | if (ptmp) { | |
b6b38f70 | 631 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 632 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 633 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
634 | cifs_small_buf_release(ptmp); |
635 | else | |
636 | cifs_buf_release(ptmp); | |
1da177e4 | 637 | } |
13cfb733 | 638 | cifs_put_tlink(pCFileStruct->tlink); |
1da177e4 LT |
639 | kfree(file->private_data); |
640 | file->private_data = NULL; | |
641 | } | |
642 | /* BB can we lock the filestruct while this is going on? */ | |
643 | FreeXid(xid); | |
644 | return rc; | |
645 | } | |
646 | ||
85160e03 PS |
647 | static struct cifsLockInfo * |
648 | cifs_lock_init(__u64 len, __u64 offset, __u8 type, __u16 netfid) | |
7ee1af76 | 649 | { |
fb8c4b14 SF |
650 | struct cifsLockInfo *li = |
651 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
85160e03 PS |
652 | if (!li) |
653 | return li; | |
d59dad2b | 654 | li->netfid = netfid; |
7ee1af76 JA |
655 | li->offset = offset; |
656 | li->length = len; | |
03776f45 PS |
657 | li->type = type; |
658 | li->pid = current->tgid; | |
85160e03 PS |
659 | INIT_LIST_HEAD(&li->blist); |
660 | init_waitqueue_head(&li->block_q); | |
661 | return li; | |
662 | } | |
663 | ||
664 | static void | |
665 | cifs_del_lock_waiters(struct cifsLockInfo *lock) | |
666 | { | |
667 | struct cifsLockInfo *li, *tmp; | |
668 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
669 | list_del_init(&li->blist); | |
670 | wake_up(&li->block_q); | |
671 | } | |
672 | } | |
673 | ||
674 | static bool | |
675 | cifs_find_lock_conflict(struct cifsInodeInfo *cinode, __u64 offset, | |
676 | __u64 length, __u8 type, __u16 netfid, | |
677 | struct cifsLockInfo **conf_lock) | |
678 | { | |
679 | struct cifsLockInfo *li, *tmp; | |
680 | ||
681 | list_for_each_entry_safe(li, tmp, &cinode->llist, llist) { | |
682 | if (offset + length <= li->offset || | |
683 | offset >= li->offset + li->length) | |
684 | continue; | |
685 | else if ((type & LOCKING_ANDX_SHARED_LOCK) && | |
686 | ((netfid == li->netfid && current->tgid == li->pid) || | |
687 | type == li->type)) | |
688 | continue; | |
689 | else { | |
690 | *conf_lock = li; | |
691 | return true; | |
692 | } | |
693 | } | |
694 | return false; | |
695 | } | |
696 | ||
697 | static int | |
698 | cifs_lock_test(struct cifsInodeInfo *cinode, __u64 offset, __u64 length, | |
699 | __u8 type, __u16 netfid, struct file_lock *flock) | |
700 | { | |
701 | int rc = 0; | |
702 | struct cifsLockInfo *conf_lock; | |
703 | bool exist; | |
704 | ||
705 | mutex_lock(&cinode->lock_mutex); | |
706 | ||
707 | exist = cifs_find_lock_conflict(cinode, offset, length, type, netfid, | |
708 | &conf_lock); | |
709 | if (exist) { | |
710 | flock->fl_start = conf_lock->offset; | |
711 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
712 | flock->fl_pid = conf_lock->pid; | |
713 | if (conf_lock->type & LOCKING_ANDX_SHARED_LOCK) | |
714 | flock->fl_type = F_RDLCK; | |
715 | else | |
716 | flock->fl_type = F_WRLCK; | |
717 | } else if (!cinode->can_cache_brlcks) | |
718 | rc = 1; | |
719 | else | |
720 | flock->fl_type = F_UNLCK; | |
721 | ||
722 | mutex_unlock(&cinode->lock_mutex); | |
723 | return rc; | |
724 | } | |
725 | ||
726 | static int | |
727 | cifs_lock_add(struct cifsInodeInfo *cinode, __u64 len, __u64 offset, | |
728 | __u8 type, __u16 netfid) | |
729 | { | |
730 | struct cifsLockInfo *li; | |
731 | ||
732 | li = cifs_lock_init(len, offset, type, netfid); | |
733 | if (!li) | |
734 | return -ENOMEM; | |
735 | ||
d59dad2b PS |
736 | mutex_lock(&cinode->lock_mutex); |
737 | list_add_tail(&li->llist, &cinode->llist); | |
738 | mutex_unlock(&cinode->lock_mutex); | |
7ee1af76 JA |
739 | return 0; |
740 | } | |
741 | ||
85160e03 PS |
742 | static int |
743 | cifs_lock_add_if(struct cifsInodeInfo *cinode, __u64 offset, __u64 length, | |
744 | __u8 type, __u16 netfid, bool wait) | |
745 | { | |
746 | struct cifsLockInfo *lock, *conf_lock; | |
747 | bool exist; | |
748 | int rc = 0; | |
749 | ||
750 | lock = cifs_lock_init(length, offset, type, netfid); | |
751 | if (!lock) | |
752 | return -ENOMEM; | |
753 | ||
754 | try_again: | |
755 | exist = false; | |
756 | mutex_lock(&cinode->lock_mutex); | |
757 | ||
758 | exist = cifs_find_lock_conflict(cinode, offset, length, type, netfid, | |
759 | &conf_lock); | |
760 | if (!exist && cinode->can_cache_brlcks) { | |
761 | list_add_tail(&lock->llist, &cinode->llist); | |
762 | mutex_unlock(&cinode->lock_mutex); | |
763 | return rc; | |
764 | } | |
765 | ||
766 | if (!exist) | |
767 | rc = 1; | |
768 | else if (!wait) | |
769 | rc = -EACCES; | |
770 | else { | |
771 | list_add_tail(&lock->blist, &conf_lock->blist); | |
772 | mutex_unlock(&cinode->lock_mutex); | |
773 | rc = wait_event_interruptible(lock->block_q, | |
774 | (lock->blist.prev == &lock->blist) && | |
775 | (lock->blist.next == &lock->blist)); | |
776 | if (!rc) | |
777 | goto try_again; | |
778 | else { | |
779 | mutex_lock(&cinode->lock_mutex); | |
780 | list_del_init(&lock->blist); | |
781 | mutex_unlock(&cinode->lock_mutex); | |
782 | } | |
783 | } | |
784 | ||
785 | kfree(lock); | |
786 | mutex_unlock(&cinode->lock_mutex); | |
787 | return rc; | |
788 | } | |
789 | ||
790 | static int | |
4f6bcec9 PS |
791 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
792 | { | |
793 | int rc = 0; | |
794 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); | |
795 | unsigned char saved_type = flock->fl_type; | |
796 | ||
797 | mutex_lock(&cinode->lock_mutex); | |
798 | posix_test_lock(file, flock); | |
799 | ||
800 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
801 | flock->fl_type = saved_type; | |
802 | rc = 1; | |
803 | } | |
804 | ||
805 | mutex_unlock(&cinode->lock_mutex); | |
806 | return rc; | |
807 | } | |
808 | ||
809 | static int | |
810 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
811 | { | |
812 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); | |
813 | int rc; | |
814 | ||
815 | mutex_lock(&cinode->lock_mutex); | |
816 | if (!cinode->can_cache_brlcks) { | |
817 | mutex_unlock(&cinode->lock_mutex); | |
818 | return 1; | |
819 | } | |
820 | rc = posix_lock_file_wait(file, flock); | |
821 | mutex_unlock(&cinode->lock_mutex); | |
822 | return rc; | |
823 | } | |
824 | ||
825 | static int | |
826 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) | |
85160e03 PS |
827 | { |
828 | int xid, rc = 0, stored_rc; | |
829 | struct cifsLockInfo *li, *tmp; | |
830 | struct cifs_tcon *tcon; | |
831 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
832 | ||
833 | xid = GetXid(); | |
834 | tcon = tlink_tcon(cfile->tlink); | |
835 | ||
836 | mutex_lock(&cinode->lock_mutex); | |
837 | if (!cinode->can_cache_brlcks) { | |
838 | mutex_unlock(&cinode->lock_mutex); | |
839 | FreeXid(xid); | |
840 | return rc; | |
841 | } | |
842 | ||
843 | list_for_each_entry_safe(li, tmp, &cinode->llist, llist) { | |
844 | stored_rc = CIFSSMBLock(xid, tcon, cfile->netfid, | |
845 | li->pid, li->length, li->offset, | |
846 | 0, 1, li->type, 0, 0); | |
847 | if (stored_rc) | |
848 | rc = stored_rc; | |
849 | } | |
850 | ||
851 | cinode->can_cache_brlcks = false; | |
852 | mutex_unlock(&cinode->lock_mutex); | |
853 | ||
854 | FreeXid(xid); | |
855 | return rc; | |
856 | } | |
857 | ||
4f6bcec9 PS |
858 | /* copied from fs/locks.c with a name change */ |
859 | #define cifs_for_each_lock(inode, lockp) \ | |
860 | for (lockp = &inode->i_flock; *lockp != NULL; \ | |
861 | lockp = &(*lockp)->fl_next) | |
862 | ||
863 | static int | |
864 | cifs_push_posix_locks(struct cifsFileInfo *cfile) | |
865 | { | |
866 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
867 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
868 | struct file_lock *flock, **before; | |
869 | struct cifsLockInfo *lck, *tmp; | |
870 | int rc = 0, xid, type; | |
871 | __u64 length; | |
872 | struct list_head locks_to_send; | |
873 | ||
874 | xid = GetXid(); | |
875 | ||
876 | mutex_lock(&cinode->lock_mutex); | |
877 | if (!cinode->can_cache_brlcks) { | |
878 | mutex_unlock(&cinode->lock_mutex); | |
879 | FreeXid(xid); | |
880 | return rc; | |
881 | } | |
882 | ||
883 | INIT_LIST_HEAD(&locks_to_send); | |
884 | ||
885 | lock_flocks(); | |
886 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
887 | flock = *before; | |
888 | length = 1 + flock->fl_end - flock->fl_start; | |
889 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
890 | type = CIFS_RDLCK; | |
891 | else | |
892 | type = CIFS_WRLCK; | |
893 | ||
894 | lck = cifs_lock_init(length, flock->fl_start, type, | |
895 | cfile->netfid); | |
896 | if (!lck) { | |
897 | rc = -ENOMEM; | |
898 | goto send_locks; | |
899 | } | |
900 | lck->pid = flock->fl_pid; | |
901 | ||
902 | list_add_tail(&lck->llist, &locks_to_send); | |
903 | } | |
904 | ||
905 | send_locks: | |
906 | unlock_flocks(); | |
907 | ||
908 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
909 | struct file_lock tmp_lock; | |
910 | int stored_rc; | |
911 | ||
912 | tmp_lock.fl_start = lck->offset; | |
913 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, | |
914 | 0, lck->length, &tmp_lock, | |
915 | lck->type, 0); | |
916 | if (stored_rc) | |
917 | rc = stored_rc; | |
918 | list_del(&lck->llist); | |
919 | kfree(lck); | |
920 | } | |
921 | ||
922 | cinode->can_cache_brlcks = false; | |
923 | mutex_unlock(&cinode->lock_mutex); | |
924 | ||
925 | FreeXid(xid); | |
926 | return rc; | |
927 | } | |
928 | ||
929 | static int | |
930 | cifs_push_locks(struct cifsFileInfo *cfile) | |
931 | { | |
932 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
933 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
934 | ||
935 | if ((tcon->ses->capabilities & CAP_UNIX) && | |
936 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
937 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
938 | return cifs_push_posix_locks(cfile); | |
939 | ||
940 | return cifs_push_mandatory_locks(cfile); | |
941 | } | |
942 | ||
03776f45 PS |
943 | static void |
944 | cifs_read_flock(struct file_lock *flock, __u8 *type, int *lock, int *unlock, | |
945 | bool *wait_flag) | |
1da177e4 | 946 | { |
03776f45 | 947 | if (flock->fl_flags & FL_POSIX) |
b6b38f70 | 948 | cFYI(1, "Posix"); |
03776f45 | 949 | if (flock->fl_flags & FL_FLOCK) |
b6b38f70 | 950 | cFYI(1, "Flock"); |
03776f45 | 951 | if (flock->fl_flags & FL_SLEEP) { |
b6b38f70 | 952 | cFYI(1, "Blocking lock"); |
03776f45 | 953 | *wait_flag = true; |
1da177e4 | 954 | } |
03776f45 | 955 | if (flock->fl_flags & FL_ACCESS) |
b6b38f70 | 956 | cFYI(1, "Process suspended by mandatory locking - " |
03776f45 PS |
957 | "not implemented yet"); |
958 | if (flock->fl_flags & FL_LEASE) | |
b6b38f70 | 959 | cFYI(1, "Lease on file - not implemented yet"); |
03776f45 | 960 | if (flock->fl_flags & |
1da177e4 | 961 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
03776f45 | 962 | cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags); |
1da177e4 | 963 | |
03776f45 PS |
964 | *type = LOCKING_ANDX_LARGE_FILES; |
965 | if (flock->fl_type == F_WRLCK) { | |
b6b38f70 | 966 | cFYI(1, "F_WRLCK "); |
03776f45 PS |
967 | *lock = 1; |
968 | } else if (flock->fl_type == F_UNLCK) { | |
b6b38f70 | 969 | cFYI(1, "F_UNLCK"); |
03776f45 PS |
970 | *unlock = 1; |
971 | /* Check if unlock includes more than one lock range */ | |
972 | } else if (flock->fl_type == F_RDLCK) { | |
b6b38f70 | 973 | cFYI(1, "F_RDLCK"); |
03776f45 PS |
974 | *type |= LOCKING_ANDX_SHARED_LOCK; |
975 | *lock = 1; | |
976 | } else if (flock->fl_type == F_EXLCK) { | |
b6b38f70 | 977 | cFYI(1, "F_EXLCK"); |
03776f45 PS |
978 | *lock = 1; |
979 | } else if (flock->fl_type == F_SHLCK) { | |
b6b38f70 | 980 | cFYI(1, "F_SHLCK"); |
03776f45 PS |
981 | *type |= LOCKING_ANDX_SHARED_LOCK; |
982 | *lock = 1; | |
1da177e4 | 983 | } else |
b6b38f70 | 984 | cFYI(1, "Unknown type of lock"); |
03776f45 | 985 | } |
1da177e4 | 986 | |
03776f45 | 987 | static int |
4f6bcec9 | 988 | cifs_getlk(struct file *file, struct file_lock *flock, __u8 type, |
03776f45 PS |
989 | bool wait_flag, bool posix_lck, int xid) |
990 | { | |
991 | int rc = 0; | |
992 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
993 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
994 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
85160e03 | 995 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
03776f45 | 996 | __u16 netfid = cfile->netfid; |
f05337c6 | 997 | |
03776f45 PS |
998 | if (posix_lck) { |
999 | int posix_lock_type; | |
4f6bcec9 PS |
1000 | |
1001 | rc = cifs_posix_lock_test(file, flock); | |
1002 | if (!rc) | |
1003 | return rc; | |
1004 | ||
03776f45 PS |
1005 | if (type & LOCKING_ANDX_SHARED_LOCK) |
1006 | posix_lock_type = CIFS_RDLCK; | |
1007 | else | |
1008 | posix_lock_type = CIFS_WRLCK; | |
4f6bcec9 PS |
1009 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
1010 | 1 /* get */, length, flock, | |
1011 | posix_lock_type, wait_flag); | |
03776f45 PS |
1012 | return rc; |
1013 | } | |
1da177e4 | 1014 | |
85160e03 PS |
1015 | rc = cifs_lock_test(cinode, flock->fl_start, length, type, netfid, |
1016 | flock); | |
1017 | if (!rc) | |
1018 | return rc; | |
1019 | ||
03776f45 PS |
1020 | /* BB we could chain these into one lock request BB */ |
1021 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length, | |
1022 | flock->fl_start, 0, 1, type, 0, 0); | |
1023 | if (rc == 0) { | |
1024 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, | |
1025 | length, flock->fl_start, 1, 0, | |
1026 | type, 0, 0); | |
1027 | flock->fl_type = F_UNLCK; | |
1028 | if (rc != 0) | |
1029 | cERROR(1, "Error unlocking previously locked " | |
1030 | "range %d during test of lock", rc); | |
1031 | rc = 0; | |
1da177e4 LT |
1032 | return rc; |
1033 | } | |
7ee1af76 | 1034 | |
03776f45 PS |
1035 | if (type & LOCKING_ANDX_SHARED_LOCK) { |
1036 | flock->fl_type = F_WRLCK; | |
1037 | rc = 0; | |
1038 | return rc; | |
7ee1af76 JA |
1039 | } |
1040 | ||
03776f45 PS |
1041 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length, |
1042 | flock->fl_start, 0, 1, | |
1043 | type | LOCKING_ANDX_SHARED_LOCK, 0, 0); | |
1044 | if (rc == 0) { | |
1045 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, | |
1046 | length, flock->fl_start, 1, 0, | |
1047 | type | LOCKING_ANDX_SHARED_LOCK, | |
1048 | 0, 0); | |
1049 | flock->fl_type = F_RDLCK; | |
1050 | if (rc != 0) | |
1051 | cERROR(1, "Error unlocking previously locked " | |
1052 | "range %d during test of lock", rc); | |
1053 | } else | |
1054 | flock->fl_type = F_WRLCK; | |
1055 | ||
1056 | rc = 0; | |
1057 | return rc; | |
1058 | } | |
1059 | ||
1060 | static int | |
1061 | cifs_setlk(struct file *file, struct file_lock *flock, __u8 type, | |
1062 | bool wait_flag, bool posix_lck, int lock, int unlock, int xid) | |
1063 | { | |
1064 | int rc = 0; | |
1065 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1066 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1067 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
d59dad2b | 1068 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); |
03776f45 PS |
1069 | __u16 netfid = cfile->netfid; |
1070 | ||
1071 | if (posix_lck) { | |
08547b03 | 1072 | int posix_lock_type; |
4f6bcec9 PS |
1073 | |
1074 | rc = cifs_posix_lock_set(file, flock); | |
1075 | if (!rc || rc < 0) | |
1076 | return rc; | |
1077 | ||
03776f45 | 1078 | if (type & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
1079 | posix_lock_type = CIFS_RDLCK; |
1080 | else | |
1081 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1082 | |
03776f45 | 1083 | if (unlock == 1) |
beb84dc8 | 1084 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1085 | |
4f6bcec9 PS |
1086 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
1087 | 0 /* set */, length, flock, | |
1088 | posix_lock_type, wait_flag); | |
03776f45 PS |
1089 | goto out; |
1090 | } | |
7ee1af76 | 1091 | |
03776f45 | 1092 | if (lock) { |
85160e03 PS |
1093 | rc = cifs_lock_add_if(cinode, flock->fl_start, length, |
1094 | type, netfid, wait_flag); | |
1095 | if (rc < 0) | |
1096 | return rc; | |
1097 | else if (!rc) | |
1098 | goto out; | |
1099 | ||
03776f45 | 1100 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length, |
85160e03 | 1101 | flock->fl_start, 0, 1, type, wait_flag, 0); |
03776f45 PS |
1102 | if (rc == 0) { |
1103 | /* For Windows locks we must store them. */ | |
85160e03 PS |
1104 | rc = cifs_lock_add(cinode, length, flock->fl_start, |
1105 | type, netfid); | |
03776f45 PS |
1106 | } |
1107 | } else if (unlock) { | |
1108 | /* | |
1109 | * For each stored lock that this unlock overlaps completely, | |
1110 | * unlock it. | |
1111 | */ | |
1112 | int stored_rc = 0; | |
1113 | struct cifsLockInfo *li, *tmp; | |
1114 | ||
d59dad2b PS |
1115 | mutex_lock(&cinode->lock_mutex); |
1116 | list_for_each_entry_safe(li, tmp, &cinode->llist, llist) { | |
03776f45 PS |
1117 | if (flock->fl_start > li->offset || |
1118 | (flock->fl_start + length) < | |
1119 | (li->offset + li->length)) | |
1120 | continue; | |
1121 | if (current->tgid != li->pid) | |
1122 | continue; | |
d59dad2b PS |
1123 | if (cfile->netfid != li->netfid) |
1124 | continue; | |
03776f45 | 1125 | |
85160e03 PS |
1126 | if (!cinode->can_cache_brlcks) |
1127 | stored_rc = CIFSSMBLock(xid, tcon, netfid, | |
1128 | current->tgid, | |
1129 | li->length, li->offset, | |
1130 | 1, 0, li->type, 0, 0); | |
1131 | else | |
1132 | stored_rc = 0; | |
1133 | ||
03776f45 PS |
1134 | if (stored_rc) |
1135 | rc = stored_rc; | |
1136 | else { | |
1137 | list_del(&li->llist); | |
85160e03 | 1138 | cifs_del_lock_waiters(li); |
03776f45 | 1139 | kfree(li); |
7ee1af76 | 1140 | } |
7ee1af76 | 1141 | } |
d59dad2b | 1142 | mutex_unlock(&cinode->lock_mutex); |
03776f45 PS |
1143 | } |
1144 | out: | |
1145 | if (flock->fl_flags & FL_POSIX) | |
1146 | posix_lock_file_wait(file, flock); | |
1147 | return rc; | |
1148 | } | |
1149 | ||
1150 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1151 | { | |
1152 | int rc, xid; | |
1153 | int lock = 0, unlock = 0; | |
1154 | bool wait_flag = false; | |
1155 | bool posix_lck = false; | |
1156 | struct cifs_sb_info *cifs_sb; | |
1157 | struct cifs_tcon *tcon; | |
1158 | struct cifsInodeInfo *cinode; | |
1159 | struct cifsFileInfo *cfile; | |
1160 | __u16 netfid; | |
1161 | __u8 type; | |
1162 | ||
1163 | rc = -EACCES; | |
1164 | xid = GetXid(); | |
1165 | ||
1166 | cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld " | |
1167 | "end: %lld", cmd, flock->fl_flags, flock->fl_type, | |
1168 | flock->fl_start, flock->fl_end); | |
1169 | ||
1170 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag); | |
1171 | ||
1172 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
1173 | cfile = (struct cifsFileInfo *)file->private_data; | |
1174 | tcon = tlink_tcon(cfile->tlink); | |
1175 | netfid = cfile->netfid; | |
1176 | cinode = CIFS_I(file->f_path.dentry->d_inode); | |
1177 | ||
1178 | if ((tcon->ses->capabilities & CAP_UNIX) && | |
1179 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
1180 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1181 | posix_lck = true; | |
1182 | /* | |
1183 | * BB add code here to normalize offset and length to account for | |
1184 | * negative length which we can not accept over the wire. | |
1185 | */ | |
1186 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1187 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
03776f45 PS |
1188 | FreeXid(xid); |
1189 | return rc; | |
1190 | } | |
1191 | ||
1192 | if (!lock && !unlock) { | |
1193 | /* | |
1194 | * if no lock or unlock then nothing to do since we do not | |
1195 | * know what it is | |
1196 | */ | |
1197 | FreeXid(xid); | |
1198 | return -EOPNOTSUPP; | |
7ee1af76 JA |
1199 | } |
1200 | ||
03776f45 PS |
1201 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1202 | xid); | |
1da177e4 LT |
1203 | FreeXid(xid); |
1204 | return rc; | |
1205 | } | |
1206 | ||
fbec9ab9 | 1207 | /* update the file size (if needed) after a write */ |
72432ffc | 1208 | void |
fbec9ab9 JL |
1209 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1210 | unsigned int bytes_written) | |
1211 | { | |
1212 | loff_t end_of_write = offset + bytes_written; | |
1213 | ||
1214 | if (end_of_write > cifsi->server_eof) | |
1215 | cifsi->server_eof = end_of_write; | |
1216 | } | |
1217 | ||
fa2989f4 | 1218 | static ssize_t cifs_write(struct cifsFileInfo *open_file, __u32 pid, |
7da4b49a JL |
1219 | const char *write_data, size_t write_size, |
1220 | loff_t *poffset) | |
1da177e4 LT |
1221 | { |
1222 | int rc = 0; | |
1223 | unsigned int bytes_written = 0; | |
1224 | unsigned int total_written; | |
1225 | struct cifs_sb_info *cifs_sb; | |
96daf2b0 | 1226 | struct cifs_tcon *pTcon; |
7749981e | 1227 | int xid; |
7da4b49a JL |
1228 | struct dentry *dentry = open_file->dentry; |
1229 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 1230 | struct cifs_io_parms io_parms; |
1da177e4 | 1231 | |
7da4b49a | 1232 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1233 | |
b6b38f70 | 1234 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
7da4b49a | 1235 | *poffset, dentry->d_name.name); |
1da177e4 | 1236 | |
13cfb733 | 1237 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 1238 | |
1da177e4 | 1239 | xid = GetXid(); |
1da177e4 | 1240 | |
1da177e4 LT |
1241 | for (total_written = 0; write_size > total_written; |
1242 | total_written += bytes_written) { | |
1243 | rc = -EAGAIN; | |
1244 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1245 | struct kvec iov[2]; |
1246 | unsigned int len; | |
1247 | ||
1da177e4 | 1248 | if (open_file->invalidHandle) { |
1da177e4 LT |
1249 | /* we could deadlock if we called |
1250 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1251 | reopen_file not to flush data to |
1da177e4 | 1252 | server now */ |
15886177 | 1253 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1254 | if (rc != 0) |
1255 | break; | |
1256 | } | |
ca83ce3d JL |
1257 | |
1258 | len = min((size_t)cifs_sb->wsize, | |
1259 | write_size - total_written); | |
1260 | /* iov[0] is reserved for smb header */ | |
1261 | iov[1].iov_base = (char *)write_data + total_written; | |
1262 | iov[1].iov_len = len; | |
fa2989f4 PS |
1263 | io_parms.netfid = open_file->netfid; |
1264 | io_parms.pid = pid; | |
1265 | io_parms.tcon = pTcon; | |
1266 | io_parms.offset = *poffset; | |
1267 | io_parms.length = len; | |
1268 | rc = CIFSSMBWrite2(xid, &io_parms, &bytes_written, iov, | |
1269 | 1, 0); | |
1da177e4 LT |
1270 | } |
1271 | if (rc || (bytes_written == 0)) { | |
1272 | if (total_written) | |
1273 | break; | |
1274 | else { | |
1275 | FreeXid(xid); | |
1276 | return rc; | |
1277 | } | |
fbec9ab9 JL |
1278 | } else { |
1279 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1280 | *poffset += bytes_written; |
fbec9ab9 | 1281 | } |
1da177e4 LT |
1282 | } |
1283 | ||
a4544347 | 1284 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 1285 | |
7da4b49a JL |
1286 | if (total_written > 0) { |
1287 | spin_lock(&dentry->d_inode->i_lock); | |
1288 | if (*poffset > dentry->d_inode->i_size) | |
1289 | i_size_write(dentry->d_inode, *poffset); | |
1290 | spin_unlock(&dentry->d_inode->i_lock); | |
1da177e4 | 1291 | } |
7da4b49a | 1292 | mark_inode_dirty_sync(dentry->d_inode); |
1da177e4 LT |
1293 | FreeXid(xid); |
1294 | return total_written; | |
1295 | } | |
1296 | ||
6508d904 JL |
1297 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1298 | bool fsuid_only) | |
630f3f0c SF |
1299 | { |
1300 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1301 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1302 | ||
1303 | /* only filter by fsuid on multiuser mounts */ | |
1304 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1305 | fsuid_only = false; | |
630f3f0c | 1306 | |
4477288a | 1307 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1308 | /* we could simply get the first_list_entry since write-only entries |
1309 | are always at the end of the list but since the first entry might | |
1310 | have a close pending, we go through the whole list */ | |
1311 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
1312 | if (fsuid_only && open_file->uid != current_fsuid()) |
1313 | continue; | |
2e396b83 | 1314 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1315 | if (!open_file->invalidHandle) { |
1316 | /* found a good file */ | |
1317 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1318 | cifsFileInfo_get(open_file); |
4477288a | 1319 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1320 | return open_file; |
1321 | } /* else might as well continue, and look for | |
1322 | another, or simply have the caller reopen it | |
1323 | again rather than trying to fix this handle */ | |
1324 | } else /* write only file */ | |
1325 | break; /* write only files are last so must be done */ | |
1326 | } | |
4477288a | 1327 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1328 | return NULL; |
1329 | } | |
630f3f0c | 1330 | |
6508d904 JL |
1331 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1332 | bool fsuid_only) | |
6148a742 SF |
1333 | { |
1334 | struct cifsFileInfo *open_file; | |
d3892294 | 1335 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1336 | bool any_available = false; |
dd99cd80 | 1337 | int rc; |
6148a742 | 1338 | |
60808233 SF |
1339 | /* Having a null inode here (because mapping->host was set to zero by |
1340 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1341 | it being zero) during stress testcases so we need to check for it */ | |
1342 | ||
fb8c4b14 | 1343 | if (cifs_inode == NULL) { |
b6b38f70 | 1344 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1345 | dump_stack(); |
1346 | return NULL; | |
1347 | } | |
1348 | ||
d3892294 JL |
1349 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1350 | ||
6508d904 JL |
1351 | /* only filter by fsuid on multiuser mounts */ |
1352 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1353 | fsuid_only = false; | |
1354 | ||
4477288a | 1355 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1356 | refind_writable: |
6148a742 | 1357 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1358 | if (!any_available && open_file->pid != current->tgid) |
1359 | continue; | |
1360 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1361 | continue; |
2e396b83 | 1362 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
6ab409b5 | 1363 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1364 | |
1365 | if (!open_file->invalidHandle) { | |
1366 | /* found a good writable file */ | |
4477288a | 1367 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 SF |
1368 | return open_file; |
1369 | } | |
8840dee9 | 1370 | |
4477288a | 1371 | spin_unlock(&cifs_file_list_lock); |
cdff08e7 | 1372 | |
9b22b0b7 | 1373 | /* Had to unlock since following call can block */ |
15886177 | 1374 | rc = cifs_reopen_file(open_file, false); |
cdff08e7 SF |
1375 | if (!rc) |
1376 | return open_file; | |
9b22b0b7 | 1377 | |
cdff08e7 | 1378 | /* if it fails, try another handle if possible */ |
b6b38f70 | 1379 | cFYI(1, "wp failed on reopen file"); |
6ab409b5 | 1380 | cifsFileInfo_put(open_file); |
8840dee9 | 1381 | |
cdff08e7 SF |
1382 | spin_lock(&cifs_file_list_lock); |
1383 | ||
9b22b0b7 SF |
1384 | /* else we simply continue to the next entry. Thus |
1385 | we do not loop on reopen errors. If we | |
1386 | can not reopen the file, for example if we | |
1387 | reconnected to a server with another client | |
1388 | racing to delete or lock the file we would not | |
1389 | make progress if we restarted before the beginning | |
1390 | of the loop here. */ | |
6148a742 SF |
1391 | } |
1392 | } | |
2846d386 JL |
1393 | /* couldn't find useable FH with same pid, try any available */ |
1394 | if (!any_available) { | |
1395 | any_available = true; | |
1396 | goto refind_writable; | |
1397 | } | |
4477288a | 1398 | spin_unlock(&cifs_file_list_lock); |
6148a742 SF |
1399 | return NULL; |
1400 | } | |
1401 | ||
1da177e4 LT |
1402 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1403 | { | |
1404 | struct address_space *mapping = page->mapping; | |
1405 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1406 | char *write_data; | |
1407 | int rc = -EFAULT; | |
1408 | int bytes_written = 0; | |
1da177e4 | 1409 | struct inode *inode; |
6148a742 | 1410 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1411 | |
1412 | if (!mapping || !mapping->host) | |
1413 | return -EFAULT; | |
1414 | ||
1415 | inode = page->mapping->host; | |
1da177e4 LT |
1416 | |
1417 | offset += (loff_t)from; | |
1418 | write_data = kmap(page); | |
1419 | write_data += from; | |
1420 | ||
1421 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1422 | kunmap(page); | |
1423 | return -EIO; | |
1424 | } | |
1425 | ||
1426 | /* racing with truncate? */ | |
1427 | if (offset > mapping->host->i_size) { | |
1428 | kunmap(page); | |
1429 | return 0; /* don't care */ | |
1430 | } | |
1431 | ||
1432 | /* check to make sure that we are not extending the file */ | |
1433 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1434 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1435 | |
6508d904 | 1436 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1437 | if (open_file) { |
fa2989f4 PS |
1438 | bytes_written = cifs_write(open_file, open_file->pid, |
1439 | write_data, to - from, &offset); | |
6ab409b5 | 1440 | cifsFileInfo_put(open_file); |
1da177e4 | 1441 | /* Does mm or vfs already set times? */ |
6148a742 | 1442 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1443 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1444 | rc = 0; |
bb5a9a04 SF |
1445 | else if (bytes_written < 0) |
1446 | rc = bytes_written; | |
6148a742 | 1447 | } else { |
b6b38f70 | 1448 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1449 | rc = -EIO; |
1450 | } | |
1451 | ||
1452 | kunmap(page); | |
1453 | return rc; | |
1454 | } | |
1455 | ||
1da177e4 | 1456 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1457 | struct writeback_control *wbc) |
1da177e4 | 1458 | { |
c3d17b63 JL |
1459 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
1460 | bool done = false, scanned = false, range_whole = false; | |
1461 | pgoff_t end, index; | |
1462 | struct cifs_writedata *wdata; | |
37c0eb46 | 1463 | struct page *page; |
37c0eb46 | 1464 | int rc = 0; |
50c2f753 | 1465 | |
37c0eb46 | 1466 | /* |
c3d17b63 | 1467 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
1468 | * one page at a time via cifs_writepage |
1469 | */ | |
1470 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1471 | return generic_writepages(mapping, wbc); | |
1472 | ||
111ebb6e | 1473 | if (wbc->range_cyclic) { |
37c0eb46 | 1474 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1475 | end = -1; |
1476 | } else { | |
1477 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1478 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1479 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
1480 | range_whole = true; |
1481 | scanned = true; | |
37c0eb46 SF |
1482 | } |
1483 | retry: | |
c3d17b63 JL |
1484 | while (!done && index <= end) { |
1485 | unsigned int i, nr_pages, found_pages; | |
1486 | pgoff_t next = 0, tofind; | |
1487 | struct page **pages; | |
1488 | ||
1489 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
1490 | end - index) + 1; | |
1491 | ||
1492 | wdata = cifs_writedata_alloc((unsigned int)tofind); | |
1493 | if (!wdata) { | |
1494 | rc = -ENOMEM; | |
1495 | break; | |
1496 | } | |
1497 | ||
1498 | /* | |
1499 | * find_get_pages_tag seems to return a max of 256 on each | |
1500 | * iteration, so we must call it several times in order to | |
1501 | * fill the array or the wsize is effectively limited to | |
1502 | * 256 * PAGE_CACHE_SIZE. | |
1503 | */ | |
1504 | found_pages = 0; | |
1505 | pages = wdata->pages; | |
1506 | do { | |
1507 | nr_pages = find_get_pages_tag(mapping, &index, | |
1508 | PAGECACHE_TAG_DIRTY, | |
1509 | tofind, pages); | |
1510 | found_pages += nr_pages; | |
1511 | tofind -= nr_pages; | |
1512 | pages += nr_pages; | |
1513 | } while (nr_pages && tofind && index <= end); | |
1514 | ||
1515 | if (found_pages == 0) { | |
1516 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1517 | break; | |
1518 | } | |
1519 | ||
1520 | nr_pages = 0; | |
1521 | for (i = 0; i < found_pages; i++) { | |
1522 | page = wdata->pages[i]; | |
37c0eb46 SF |
1523 | /* |
1524 | * At this point we hold neither mapping->tree_lock nor | |
1525 | * lock on the page itself: the page may be truncated or | |
1526 | * invalidated (changing page->mapping to NULL), or even | |
1527 | * swizzled back from swapper_space to tmpfs file | |
1528 | * mapping | |
1529 | */ | |
1530 | ||
c3d17b63 | 1531 | if (nr_pages == 0) |
37c0eb46 | 1532 | lock_page(page); |
529ae9aa | 1533 | else if (!trylock_page(page)) |
37c0eb46 SF |
1534 | break; |
1535 | ||
1536 | if (unlikely(page->mapping != mapping)) { | |
1537 | unlock_page(page); | |
1538 | break; | |
1539 | } | |
1540 | ||
111ebb6e | 1541 | if (!wbc->range_cyclic && page->index > end) { |
c3d17b63 | 1542 | done = true; |
37c0eb46 SF |
1543 | unlock_page(page); |
1544 | break; | |
1545 | } | |
1546 | ||
1547 | if (next && (page->index != next)) { | |
1548 | /* Not next consecutive page */ | |
1549 | unlock_page(page); | |
1550 | break; | |
1551 | } | |
1552 | ||
1553 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1554 | wait_on_page_writeback(page); | |
1555 | ||
1556 | if (PageWriteback(page) || | |
cb876f45 | 1557 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1558 | unlock_page(page); |
1559 | break; | |
1560 | } | |
84d2f07e | 1561 | |
cb876f45 LT |
1562 | /* |
1563 | * This actually clears the dirty bit in the radix tree. | |
1564 | * See cifs_writepage() for more commentary. | |
1565 | */ | |
1566 | set_page_writeback(page); | |
1567 | ||
84d2f07e | 1568 | if (page_offset(page) >= mapping->host->i_size) { |
c3d17b63 | 1569 | done = true; |
84d2f07e | 1570 | unlock_page(page); |
cb876f45 | 1571 | end_page_writeback(page); |
84d2f07e SF |
1572 | break; |
1573 | } | |
1574 | ||
c3d17b63 JL |
1575 | wdata->pages[i] = page; |
1576 | next = page->index + 1; | |
1577 | ++nr_pages; | |
1578 | } | |
37c0eb46 | 1579 | |
c3d17b63 JL |
1580 | /* reset index to refind any pages skipped */ |
1581 | if (nr_pages == 0) | |
1582 | index = wdata->pages[0]->index + 1; | |
84d2f07e | 1583 | |
c3d17b63 JL |
1584 | /* put any pages we aren't going to use */ |
1585 | for (i = nr_pages; i < found_pages; i++) { | |
1586 | page_cache_release(wdata->pages[i]); | |
1587 | wdata->pages[i] = NULL; | |
1588 | } | |
37c0eb46 | 1589 | |
c3d17b63 JL |
1590 | /* nothing to write? */ |
1591 | if (nr_pages == 0) { | |
1592 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1593 | continue; | |
37c0eb46 | 1594 | } |
fbec9ab9 | 1595 | |
c3d17b63 JL |
1596 | wdata->sync_mode = wbc->sync_mode; |
1597 | wdata->nr_pages = nr_pages; | |
1598 | wdata->offset = page_offset(wdata->pages[0]); | |
941b853d | 1599 | |
c3d17b63 JL |
1600 | do { |
1601 | if (wdata->cfile != NULL) | |
1602 | cifsFileInfo_put(wdata->cfile); | |
1603 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), | |
1604 | false); | |
1605 | if (!wdata->cfile) { | |
1606 | cERROR(1, "No writable handles for inode"); | |
1607 | rc = -EBADF; | |
1608 | break; | |
941b853d | 1609 | } |
c3d17b63 JL |
1610 | rc = cifs_async_writev(wdata); |
1611 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); | |
941b853d | 1612 | |
c3d17b63 JL |
1613 | for (i = 0; i < nr_pages; ++i) |
1614 | unlock_page(wdata->pages[i]); | |
f3983c21 | 1615 | |
c3d17b63 JL |
1616 | /* send failure -- clean up the mess */ |
1617 | if (rc != 0) { | |
1618 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 1619 | if (rc == -EAGAIN) |
c3d17b63 JL |
1620 | redirty_page_for_writepage(wbc, |
1621 | wdata->pages[i]); | |
1622 | else | |
1623 | SetPageError(wdata->pages[i]); | |
1624 | end_page_writeback(wdata->pages[i]); | |
1625 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 1626 | } |
941b853d JL |
1627 | if (rc != -EAGAIN) |
1628 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
1629 | } |
1630 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 1631 | |
c3d17b63 JL |
1632 | wbc->nr_to_write -= nr_pages; |
1633 | if (wbc->nr_to_write <= 0) | |
1634 | done = true; | |
b066a48c | 1635 | |
c3d17b63 | 1636 | index = next; |
37c0eb46 | 1637 | } |
c3d17b63 | 1638 | |
37c0eb46 SF |
1639 | if (!scanned && !done) { |
1640 | /* | |
1641 | * We hit the last page and there is more work to be done: wrap | |
1642 | * back to the start of the file | |
1643 | */ | |
c3d17b63 | 1644 | scanned = true; |
37c0eb46 SF |
1645 | index = 0; |
1646 | goto retry; | |
1647 | } | |
c3d17b63 | 1648 | |
111ebb6e | 1649 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1650 | mapping->writeback_index = index; |
1651 | ||
1da177e4 LT |
1652 | return rc; |
1653 | } | |
1da177e4 | 1654 | |
9ad1506b PS |
1655 | static int |
1656 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 1657 | { |
9ad1506b | 1658 | int rc; |
1da177e4 LT |
1659 | int xid; |
1660 | ||
1661 | xid = GetXid(); | |
1662 | /* BB add check for wbc flags */ | |
1663 | page_cache_get(page); | |
ad7a2926 | 1664 | if (!PageUptodate(page)) |
b6b38f70 | 1665 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1666 | |
1667 | /* | |
1668 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1669 | * | |
1670 | * A writepage() implementation always needs to do either this, | |
1671 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1672 | * the case of a failure. | |
1673 | * | |
1674 | * Just unlocking the page will cause the radix tree tag-bits | |
1675 | * to fail to update with the state of the page correctly. | |
1676 | */ | |
fb8c4b14 | 1677 | set_page_writeback(page); |
9ad1506b | 1678 | retry_write: |
1da177e4 | 1679 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
1680 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
1681 | goto retry_write; | |
1682 | else if (rc == -EAGAIN) | |
1683 | redirty_page_for_writepage(wbc, page); | |
1684 | else if (rc != 0) | |
1685 | SetPageError(page); | |
1686 | else | |
1687 | SetPageUptodate(page); | |
cb876f45 LT |
1688 | end_page_writeback(page); |
1689 | page_cache_release(page); | |
1da177e4 LT |
1690 | FreeXid(xid); |
1691 | return rc; | |
1692 | } | |
1693 | ||
9ad1506b PS |
1694 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1695 | { | |
1696 | int rc = cifs_writepage_locked(page, wbc); | |
1697 | unlock_page(page); | |
1698 | return rc; | |
1699 | } | |
1700 | ||
d9414774 NP |
1701 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1702 | loff_t pos, unsigned len, unsigned copied, | |
1703 | struct page *page, void *fsdata) | |
1da177e4 | 1704 | { |
d9414774 NP |
1705 | int rc; |
1706 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
1707 | struct cifsFileInfo *cfile = file->private_data; |
1708 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
1709 | __u32 pid; | |
1710 | ||
1711 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
1712 | pid = cfile->pid; | |
1713 | else | |
1714 | pid = current->tgid; | |
1da177e4 | 1715 | |
b6b38f70 JP |
1716 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1717 | page, pos, copied); | |
d9414774 | 1718 | |
a98ee8c1 JL |
1719 | if (PageChecked(page)) { |
1720 | if (copied == len) | |
1721 | SetPageUptodate(page); | |
1722 | ClearPageChecked(page); | |
1723 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1724 | SetPageUptodate(page); |
ad7a2926 | 1725 | |
1da177e4 | 1726 | if (!PageUptodate(page)) { |
d9414774 NP |
1727 | char *page_data; |
1728 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1729 | int xid; | |
1730 | ||
1731 | xid = GetXid(); | |
1da177e4 LT |
1732 | /* this is probably better than directly calling |
1733 | partialpage_write since in this function the file handle is | |
1734 | known which we might as well leverage */ | |
1735 | /* BB check if anything else missing out of ppw | |
1736 | such as updating last write time */ | |
1737 | page_data = kmap(page); | |
d4ffff1f | 1738 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 1739 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 1740 | kunmap(page); |
d9414774 NP |
1741 | |
1742 | FreeXid(xid); | |
fb8c4b14 | 1743 | } else { |
d9414774 NP |
1744 | rc = copied; |
1745 | pos += copied; | |
1da177e4 LT |
1746 | set_page_dirty(page); |
1747 | } | |
1748 | ||
d9414774 NP |
1749 | if (rc > 0) { |
1750 | spin_lock(&inode->i_lock); | |
1751 | if (pos > inode->i_size) | |
1752 | i_size_write(inode, pos); | |
1753 | spin_unlock(&inode->i_lock); | |
1754 | } | |
1755 | ||
1756 | unlock_page(page); | |
1757 | page_cache_release(page); | |
1758 | ||
1da177e4 LT |
1759 | return rc; |
1760 | } | |
1761 | ||
02c24a82 JB |
1762 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
1763 | int datasync) | |
1da177e4 LT |
1764 | { |
1765 | int xid; | |
1766 | int rc = 0; | |
96daf2b0 | 1767 | struct cifs_tcon *tcon; |
c21dfb69 | 1768 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1769 | struct inode *inode = file->f_path.dentry->d_inode; |
8be7e6ba | 1770 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 1771 | |
02c24a82 JB |
1772 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
1773 | if (rc) | |
1774 | return rc; | |
1775 | mutex_lock(&inode->i_mutex); | |
1776 | ||
1da177e4 LT |
1777 | xid = GetXid(); |
1778 | ||
b6b38f70 | 1779 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1780 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1781 | |
6feb9891 PS |
1782 | if (!CIFS_I(inode)->clientCanCacheRead) { |
1783 | rc = cifs_invalidate_mapping(inode); | |
1784 | if (rc) { | |
1785 | cFYI(1, "rc: %d during invalidate phase", rc); | |
1786 | rc = 0; /* don't care about it in fsync */ | |
1787 | } | |
1788 | } | |
eb4b756b | 1789 | |
8be7e6ba PS |
1790 | tcon = tlink_tcon(smbfile->tlink); |
1791 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1792 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
1793 | ||
1794 | FreeXid(xid); | |
02c24a82 | 1795 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
1796 | return rc; |
1797 | } | |
1798 | ||
02c24a82 | 1799 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba PS |
1800 | { |
1801 | int xid; | |
1802 | int rc = 0; | |
96daf2b0 | 1803 | struct cifs_tcon *tcon; |
8be7e6ba PS |
1804 | struct cifsFileInfo *smbfile = file->private_data; |
1805 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
1806 | struct inode *inode = file->f_mapping->host; |
1807 | ||
1808 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
1809 | if (rc) | |
1810 | return rc; | |
1811 | mutex_lock(&inode->i_mutex); | |
8be7e6ba PS |
1812 | |
1813 | xid = GetXid(); | |
1814 | ||
1815 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
1816 | file->f_path.dentry->d_name.name, datasync); | |
1817 | ||
1818 | tcon = tlink_tcon(smbfile->tlink); | |
1819 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1820 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
b298f223 | 1821 | |
1da177e4 | 1822 | FreeXid(xid); |
02c24a82 | 1823 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
1824 | return rc; |
1825 | } | |
1826 | ||
1da177e4 LT |
1827 | /* |
1828 | * As file closes, flush all cached write data for this inode checking | |
1829 | * for write behind errors. | |
1830 | */ | |
75e1fcc0 | 1831 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1832 | { |
fb8c4b14 | 1833 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1834 | int rc = 0; |
1835 | ||
eb4b756b | 1836 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 1837 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 1838 | |
b6b38f70 | 1839 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1840 | |
1841 | return rc; | |
1842 | } | |
1843 | ||
72432ffc PS |
1844 | static int |
1845 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
1846 | { | |
1847 | int rc = 0; | |
1848 | unsigned long i; | |
1849 | ||
1850 | for (i = 0; i < num_pages; i++) { | |
1851 | pages[i] = alloc_page(__GFP_HIGHMEM); | |
1852 | if (!pages[i]) { | |
1853 | /* | |
1854 | * save number of pages we have already allocated and | |
1855 | * return with ENOMEM error | |
1856 | */ | |
1857 | num_pages = i; | |
1858 | rc = -ENOMEM; | |
1859 | goto error; | |
1860 | } | |
1861 | } | |
1862 | ||
1863 | return rc; | |
1864 | ||
1865 | error: | |
1866 | for (i = 0; i < num_pages; i++) | |
1867 | put_page(pages[i]); | |
1868 | return rc; | |
1869 | } | |
1870 | ||
1871 | static inline | |
1872 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
1873 | { | |
1874 | size_t num_pages; | |
1875 | size_t clen; | |
1876 | ||
1877 | clen = min_t(const size_t, len, wsize); | |
1878 | num_pages = clen / PAGE_CACHE_SIZE; | |
1879 | if (clen % PAGE_CACHE_SIZE) | |
1880 | num_pages++; | |
1881 | ||
1882 | if (cur_len) | |
1883 | *cur_len = clen; | |
1884 | ||
1885 | return num_pages; | |
1886 | } | |
1887 | ||
1888 | static ssize_t | |
1889 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
1890 | unsigned long nr_segs, loff_t *poffset) | |
1891 | { | |
76429c14 PS |
1892 | unsigned int written; |
1893 | unsigned long num_pages, npages, i; | |
1894 | size_t copied, len, cur_len; | |
1895 | ssize_t total_written = 0; | |
72432ffc PS |
1896 | struct kvec *to_send; |
1897 | struct page **pages; | |
1898 | struct iov_iter it; | |
1899 | struct inode *inode; | |
1900 | struct cifsFileInfo *open_file; | |
96daf2b0 | 1901 | struct cifs_tcon *pTcon; |
72432ffc | 1902 | struct cifs_sb_info *cifs_sb; |
fa2989f4 | 1903 | struct cifs_io_parms io_parms; |
72432ffc | 1904 | int xid, rc; |
d4ffff1f | 1905 | __u32 pid; |
72432ffc PS |
1906 | |
1907 | len = iov_length(iov, nr_segs); | |
1908 | if (!len) | |
1909 | return 0; | |
1910 | ||
1911 | rc = generic_write_checks(file, poffset, &len, 0); | |
1912 | if (rc) | |
1913 | return rc; | |
1914 | ||
1915 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
1916 | num_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
1917 | ||
1918 | pages = kmalloc(sizeof(struct pages *)*num_pages, GFP_KERNEL); | |
1919 | if (!pages) | |
1920 | return -ENOMEM; | |
1921 | ||
1922 | to_send = kmalloc(sizeof(struct kvec)*(num_pages + 1), GFP_KERNEL); | |
1923 | if (!to_send) { | |
1924 | kfree(pages); | |
1925 | return -ENOMEM; | |
1926 | } | |
1927 | ||
1928 | rc = cifs_write_allocate_pages(pages, num_pages); | |
1929 | if (rc) { | |
1930 | kfree(pages); | |
1931 | kfree(to_send); | |
1932 | return rc; | |
1933 | } | |
1934 | ||
1935 | xid = GetXid(); | |
1936 | open_file = file->private_data; | |
d4ffff1f PS |
1937 | |
1938 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
1939 | pid = open_file->pid; | |
1940 | else | |
1941 | pid = current->tgid; | |
1942 | ||
72432ffc PS |
1943 | pTcon = tlink_tcon(open_file->tlink); |
1944 | inode = file->f_path.dentry->d_inode; | |
1945 | ||
1946 | iov_iter_init(&it, iov, nr_segs, len, 0); | |
1947 | npages = num_pages; | |
1948 | ||
1949 | do { | |
1950 | size_t save_len = cur_len; | |
1951 | for (i = 0; i < npages; i++) { | |
1952 | copied = min_t(const size_t, cur_len, PAGE_CACHE_SIZE); | |
1953 | copied = iov_iter_copy_from_user(pages[i], &it, 0, | |
1954 | copied); | |
1955 | cur_len -= copied; | |
1956 | iov_iter_advance(&it, copied); | |
1957 | to_send[i+1].iov_base = kmap(pages[i]); | |
1958 | to_send[i+1].iov_len = copied; | |
1959 | } | |
1960 | ||
1961 | cur_len = save_len - cur_len; | |
1962 | ||
1963 | do { | |
1964 | if (open_file->invalidHandle) { | |
1965 | rc = cifs_reopen_file(open_file, false); | |
1966 | if (rc != 0) | |
1967 | break; | |
1968 | } | |
fa2989f4 | 1969 | io_parms.netfid = open_file->netfid; |
d4ffff1f | 1970 | io_parms.pid = pid; |
fa2989f4 PS |
1971 | io_parms.tcon = pTcon; |
1972 | io_parms.offset = *poffset; | |
1973 | io_parms.length = cur_len; | |
1974 | rc = CIFSSMBWrite2(xid, &io_parms, &written, to_send, | |
1975 | npages, 0); | |
72432ffc PS |
1976 | } while (rc == -EAGAIN); |
1977 | ||
1978 | for (i = 0; i < npages; i++) | |
1979 | kunmap(pages[i]); | |
1980 | ||
1981 | if (written) { | |
1982 | len -= written; | |
1983 | total_written += written; | |
1984 | cifs_update_eof(CIFS_I(inode), *poffset, written); | |
1985 | *poffset += written; | |
1986 | } else if (rc < 0) { | |
1987 | if (!total_written) | |
1988 | total_written = rc; | |
1989 | break; | |
1990 | } | |
1991 | ||
1992 | /* get length and number of kvecs of the next write */ | |
1993 | npages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
1994 | } while (len > 0); | |
1995 | ||
1996 | if (total_written > 0) { | |
1997 | spin_lock(&inode->i_lock); | |
1998 | if (*poffset > inode->i_size) | |
1999 | i_size_write(inode, *poffset); | |
2000 | spin_unlock(&inode->i_lock); | |
2001 | } | |
2002 | ||
2003 | cifs_stats_bytes_written(pTcon, total_written); | |
2004 | mark_inode_dirty_sync(inode); | |
2005 | ||
2006 | for (i = 0; i < num_pages; i++) | |
2007 | put_page(pages[i]); | |
2008 | kfree(to_send); | |
2009 | kfree(pages); | |
2010 | FreeXid(xid); | |
2011 | return total_written; | |
2012 | } | |
2013 | ||
0b81c1c4 | 2014 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
2015 | unsigned long nr_segs, loff_t pos) |
2016 | { | |
2017 | ssize_t written; | |
2018 | struct inode *inode; | |
2019 | ||
2020 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2021 | ||
2022 | /* | |
2023 | * BB - optimize the way when signing is disabled. We can drop this | |
2024 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2025 | * write request. | |
2026 | */ | |
2027 | ||
2028 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
2029 | if (written > 0) { | |
2030 | CIFS_I(inode)->invalid_mapping = true; | |
2031 | iocb->ki_pos = pos; | |
2032 | } | |
2033 | ||
2034 | return written; | |
2035 | } | |
2036 | ||
2037 | ssize_t cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
2038 | unsigned long nr_segs, loff_t pos) | |
2039 | { | |
2040 | struct inode *inode; | |
2041 | ||
2042 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2043 | ||
2044 | if (CIFS_I(inode)->clientCanCacheAll) | |
2045 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
2046 | ||
2047 | /* | |
2048 | * In strict cache mode we need to write the data to the server exactly | |
2049 | * from the pos to pos+len-1 rather than flush all affected pages | |
2050 | * because it may cause a error with mandatory locks on these pages but | |
2051 | * not on the region from pos to ppos+len-1. | |
2052 | */ | |
2053 | ||
2054 | return cifs_user_writev(iocb, iov, nr_segs, pos); | |
2055 | } | |
2056 | ||
a70307ee PS |
2057 | static ssize_t |
2058 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
2059 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 2060 | { |
a70307ee PS |
2061 | int rc; |
2062 | int xid; | |
76429c14 PS |
2063 | ssize_t total_read; |
2064 | unsigned int bytes_read = 0; | |
a70307ee PS |
2065 | size_t len, cur_len; |
2066 | int iov_offset = 0; | |
1da177e4 | 2067 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 2068 | struct cifs_tcon *pTcon; |
1da177e4 | 2069 | struct cifsFileInfo *open_file; |
1da177e4 | 2070 | struct smb_com_read_rsp *pSMBr; |
d4ffff1f | 2071 | struct cifs_io_parms io_parms; |
a70307ee | 2072 | char *read_data; |
5eba8ab3 | 2073 | unsigned int rsize; |
d4ffff1f | 2074 | __u32 pid; |
a70307ee PS |
2075 | |
2076 | if (!nr_segs) | |
2077 | return 0; | |
2078 | ||
2079 | len = iov_length(iov, nr_segs); | |
2080 | if (!len) | |
2081 | return 0; | |
1da177e4 LT |
2082 | |
2083 | xid = GetXid(); | |
e6a00296 | 2084 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2085 | |
5eba8ab3 JL |
2086 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
2087 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
2088 | ||
c21dfb69 | 2089 | open_file = file->private_data; |
13cfb733 | 2090 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 2091 | |
d4ffff1f PS |
2092 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2093 | pid = open_file->pid; | |
2094 | else | |
2095 | pid = current->tgid; | |
2096 | ||
ad7a2926 | 2097 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2098 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 2099 | |
a70307ee | 2100 | for (total_read = 0; total_read < len; total_read += bytes_read) { |
5eba8ab3 | 2101 | cur_len = min_t(const size_t, len - total_read, rsize); |
1da177e4 | 2102 | rc = -EAGAIN; |
a70307ee PS |
2103 | read_data = NULL; |
2104 | ||
1da177e4 | 2105 | while (rc == -EAGAIN) { |
ec637e3f | 2106 | int buf_type = CIFS_NO_BUFFER; |
cdff08e7 | 2107 | if (open_file->invalidHandle) { |
15886177 | 2108 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
2109 | if (rc != 0) |
2110 | break; | |
2111 | } | |
d4ffff1f PS |
2112 | io_parms.netfid = open_file->netfid; |
2113 | io_parms.pid = pid; | |
2114 | io_parms.tcon = pTcon; | |
2115 | io_parms.offset = *poffset; | |
2cebaa58 | 2116 | io_parms.length = cur_len; |
d4ffff1f | 2117 | rc = CIFSSMBRead(xid, &io_parms, &bytes_read, |
a70307ee PS |
2118 | &read_data, &buf_type); |
2119 | pSMBr = (struct smb_com_read_rsp *)read_data; | |
2120 | if (read_data) { | |
2121 | char *data_offset = read_data + 4 + | |
2122 | le16_to_cpu(pSMBr->DataOffset); | |
2123 | if (memcpy_toiovecend(iov, data_offset, | |
2124 | iov_offset, bytes_read)) | |
93544cc6 | 2125 | rc = -EFAULT; |
fb8c4b14 | 2126 | if (buf_type == CIFS_SMALL_BUFFER) |
a70307ee | 2127 | cifs_small_buf_release(read_data); |
fb8c4b14 | 2128 | else if (buf_type == CIFS_LARGE_BUFFER) |
a70307ee PS |
2129 | cifs_buf_release(read_data); |
2130 | read_data = NULL; | |
2131 | iov_offset += bytes_read; | |
1da177e4 LT |
2132 | } |
2133 | } | |
a70307ee | 2134 | |
1da177e4 LT |
2135 | if (rc || (bytes_read == 0)) { |
2136 | if (total_read) { | |
2137 | break; | |
2138 | } else { | |
2139 | FreeXid(xid); | |
2140 | return rc; | |
2141 | } | |
2142 | } else { | |
a4544347 | 2143 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
2144 | *poffset += bytes_read; |
2145 | } | |
2146 | } | |
a70307ee | 2147 | |
1da177e4 LT |
2148 | FreeXid(xid); |
2149 | return total_read; | |
2150 | } | |
2151 | ||
0b81c1c4 | 2152 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
2153 | unsigned long nr_segs, loff_t pos) |
2154 | { | |
2155 | ssize_t read; | |
2156 | ||
2157 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
2158 | if (read > 0) | |
2159 | iocb->ki_pos = pos; | |
2160 | ||
2161 | return read; | |
2162 | } | |
2163 | ||
2164 | ssize_t cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
2165 | unsigned long nr_segs, loff_t pos) | |
2166 | { | |
2167 | struct inode *inode; | |
2168 | ||
2169 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2170 | ||
2171 | if (CIFS_I(inode)->clientCanCacheRead) | |
2172 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
2173 | ||
2174 | /* | |
2175 | * In strict cache mode we need to read from the server all the time | |
2176 | * if we don't have level II oplock because the server can delay mtime | |
2177 | * change - so we can't make a decision about inode invalidating. | |
2178 | * And we can also fail with pagereading if there are mandatory locks | |
2179 | * on pages affected by this read but not on the region from pos to | |
2180 | * pos+len-1. | |
2181 | */ | |
2182 | ||
2183 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
2184 | } | |
1da177e4 LT |
2185 | |
2186 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
a70307ee | 2187 | loff_t *poffset) |
1da177e4 LT |
2188 | { |
2189 | int rc = -EACCES; | |
2190 | unsigned int bytes_read = 0; | |
2191 | unsigned int total_read; | |
2192 | unsigned int current_read_size; | |
5eba8ab3 | 2193 | unsigned int rsize; |
1da177e4 | 2194 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 2195 | struct cifs_tcon *pTcon; |
1da177e4 LT |
2196 | int xid; |
2197 | char *current_offset; | |
2198 | struct cifsFileInfo *open_file; | |
d4ffff1f | 2199 | struct cifs_io_parms io_parms; |
ec637e3f | 2200 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 2201 | __u32 pid; |
1da177e4 LT |
2202 | |
2203 | xid = GetXid(); | |
e6a00296 | 2204 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2205 | |
5eba8ab3 JL |
2206 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
2207 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
2208 | ||
1da177e4 | 2209 | if (file->private_data == NULL) { |
0f3bc09e | 2210 | rc = -EBADF; |
1da177e4 | 2211 | FreeXid(xid); |
0f3bc09e | 2212 | return rc; |
1da177e4 | 2213 | } |
c21dfb69 | 2214 | open_file = file->private_data; |
13cfb733 | 2215 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 2216 | |
d4ffff1f PS |
2217 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2218 | pid = open_file->pid; | |
2219 | else | |
2220 | pid = current->tgid; | |
2221 | ||
1da177e4 | 2222 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2223 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 2224 | |
fb8c4b14 | 2225 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
2226 | read_size > total_read; |
2227 | total_read += bytes_read, current_offset += bytes_read) { | |
5eba8ab3 JL |
2228 | current_read_size = min_t(uint, read_size - total_read, rsize); |
2229 | ||
f9f5c817 SF |
2230 | /* For windows me and 9x we do not want to request more |
2231 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 2232 | if ((pTcon->ses) && |
f9f5c817 | 2233 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
7748dd6e | 2234 | current_read_size = min_t(uint, current_read_size, |
c974befa | 2235 | CIFSMaxBufSize); |
f9f5c817 | 2236 | } |
1da177e4 LT |
2237 | rc = -EAGAIN; |
2238 | while (rc == -EAGAIN) { | |
cdff08e7 | 2239 | if (open_file->invalidHandle) { |
15886177 | 2240 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
2241 | if (rc != 0) |
2242 | break; | |
2243 | } | |
d4ffff1f PS |
2244 | io_parms.netfid = open_file->netfid; |
2245 | io_parms.pid = pid; | |
2246 | io_parms.tcon = pTcon; | |
2247 | io_parms.offset = *poffset; | |
2248 | io_parms.length = current_read_size; | |
2249 | rc = CIFSSMBRead(xid, &io_parms, &bytes_read, | |
2250 | ¤t_offset, &buf_type); | |
1da177e4 LT |
2251 | } |
2252 | if (rc || (bytes_read == 0)) { | |
2253 | if (total_read) { | |
2254 | break; | |
2255 | } else { | |
2256 | FreeXid(xid); | |
2257 | return rc; | |
2258 | } | |
2259 | } else { | |
a4544347 | 2260 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
2261 | *poffset += bytes_read; |
2262 | } | |
2263 | } | |
2264 | FreeXid(xid); | |
2265 | return total_read; | |
2266 | } | |
2267 | ||
ca83ce3d JL |
2268 | /* |
2269 | * If the page is mmap'ed into a process' page tables, then we need to make | |
2270 | * sure that it doesn't change while being written back. | |
2271 | */ | |
2272 | static int | |
2273 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
2274 | { | |
2275 | struct page *page = vmf->page; | |
2276 | ||
2277 | lock_page(page); | |
2278 | return VM_FAULT_LOCKED; | |
2279 | } | |
2280 | ||
2281 | static struct vm_operations_struct cifs_file_vm_ops = { | |
2282 | .fault = filemap_fault, | |
2283 | .page_mkwrite = cifs_page_mkwrite, | |
2284 | }; | |
2285 | ||
7a6a19b1 PS |
2286 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
2287 | { | |
2288 | int rc, xid; | |
2289 | struct inode *inode = file->f_path.dentry->d_inode; | |
2290 | ||
2291 | xid = GetXid(); | |
2292 | ||
6feb9891 PS |
2293 | if (!CIFS_I(inode)->clientCanCacheRead) { |
2294 | rc = cifs_invalidate_mapping(inode); | |
2295 | if (rc) | |
2296 | return rc; | |
2297 | } | |
7a6a19b1 PS |
2298 | |
2299 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
2300 | if (rc == 0) |
2301 | vma->vm_ops = &cifs_file_vm_ops; | |
7a6a19b1 PS |
2302 | FreeXid(xid); |
2303 | return rc; | |
2304 | } | |
2305 | ||
1da177e4 LT |
2306 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
2307 | { | |
1da177e4 LT |
2308 | int rc, xid; |
2309 | ||
2310 | xid = GetXid(); | |
abab095d | 2311 | rc = cifs_revalidate_file(file); |
1da177e4 | 2312 | if (rc) { |
b6b38f70 | 2313 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
2314 | FreeXid(xid); |
2315 | return rc; | |
2316 | } | |
2317 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
2318 | if (rc == 0) |
2319 | vma->vm_ops = &cifs_file_vm_ops; | |
1da177e4 LT |
2320 | FreeXid(xid); |
2321 | return rc; | |
2322 | } | |
2323 | ||
1da177e4 LT |
2324 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
2325 | struct list_head *page_list, unsigned num_pages) | |
2326 | { | |
690c5e31 JL |
2327 | int rc; |
2328 | struct list_head tmplist; | |
2329 | struct cifsFileInfo *open_file = file->private_data; | |
2330 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
2331 | unsigned int rsize = cifs_sb->rsize; | |
2332 | pid_t pid; | |
1da177e4 | 2333 | |
690c5e31 JL |
2334 | /* |
2335 | * Give up immediately if rsize is too small to read an entire page. | |
2336 | * The VFS will fall back to readpage. We should never reach this | |
2337 | * point however since we set ra_pages to 0 when the rsize is smaller | |
2338 | * than a cache page. | |
2339 | */ | |
2340 | if (unlikely(rsize < PAGE_CACHE_SIZE)) | |
2341 | return 0; | |
bfa0d75a | 2342 | |
56698236 SJ |
2343 | /* |
2344 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
2345 | * immediately if the cookie is negative | |
2346 | */ | |
2347 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
2348 | &num_pages); | |
2349 | if (rc == 0) | |
690c5e31 | 2350 | return rc; |
56698236 | 2351 | |
d4ffff1f PS |
2352 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2353 | pid = open_file->pid; | |
2354 | else | |
2355 | pid = current->tgid; | |
2356 | ||
690c5e31 JL |
2357 | rc = 0; |
2358 | INIT_LIST_HEAD(&tmplist); | |
1da177e4 | 2359 | |
690c5e31 JL |
2360 | cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file, |
2361 | mapping, num_pages); | |
2362 | ||
2363 | /* | |
2364 | * Start with the page at end of list and move it to private | |
2365 | * list. Do the same with any following pages until we hit | |
2366 | * the rsize limit, hit an index discontinuity, or run out of | |
2367 | * pages. Issue the async read and then start the loop again | |
2368 | * until the list is empty. | |
2369 | * | |
2370 | * Note that list order is important. The page_list is in | |
2371 | * the order of declining indexes. When we put the pages in | |
2372 | * the rdata->pages, then we want them in increasing order. | |
2373 | */ | |
2374 | while (!list_empty(page_list)) { | |
2375 | unsigned int bytes = PAGE_CACHE_SIZE; | |
2376 | unsigned int expected_index; | |
2377 | unsigned int nr_pages = 1; | |
2378 | loff_t offset; | |
2379 | struct page *page, *tpage; | |
2380 | struct cifs_readdata *rdata; | |
1da177e4 LT |
2381 | |
2382 | page = list_entry(page_list->prev, struct page, lru); | |
690c5e31 JL |
2383 | |
2384 | /* | |
2385 | * Lock the page and put it in the cache. Since no one else | |
2386 | * should have access to this page, we're safe to simply set | |
2387 | * PG_locked without checking it first. | |
2388 | */ | |
2389 | __set_page_locked(page); | |
2390 | rc = add_to_page_cache_locked(page, mapping, | |
2391 | page->index, GFP_KERNEL); | |
2392 | ||
2393 | /* give up if we can't stick it in the cache */ | |
2394 | if (rc) { | |
2395 | __clear_page_locked(page); | |
2396 | break; | |
2397 | } | |
2398 | ||
2399 | /* move first page to the tmplist */ | |
1da177e4 | 2400 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
690c5e31 | 2401 | list_move_tail(&page->lru, &tmplist); |
1da177e4 | 2402 | |
690c5e31 JL |
2403 | /* now try and add more pages onto the request */ |
2404 | expected_index = page->index + 1; | |
2405 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
2406 | /* discontinuity ? */ | |
2407 | if (page->index != expected_index) | |
fb8c4b14 | 2408 | break; |
690c5e31 JL |
2409 | |
2410 | /* would this page push the read over the rsize? */ | |
2411 | if (bytes + PAGE_CACHE_SIZE > rsize) | |
2412 | break; | |
2413 | ||
2414 | __set_page_locked(page); | |
2415 | if (add_to_page_cache_locked(page, mapping, | |
2416 | page->index, GFP_KERNEL)) { | |
2417 | __clear_page_locked(page); | |
2418 | break; | |
2419 | } | |
2420 | list_move_tail(&page->lru, &tmplist); | |
2421 | bytes += PAGE_CACHE_SIZE; | |
2422 | expected_index++; | |
2423 | nr_pages++; | |
1da177e4 | 2424 | } |
690c5e31 JL |
2425 | |
2426 | rdata = cifs_readdata_alloc(nr_pages); | |
2427 | if (!rdata) { | |
2428 | /* best to give up if we're out of mem */ | |
2429 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
2430 | list_del(&page->lru); | |
2431 | lru_cache_add_file(page); | |
2432 | unlock_page(page); | |
2433 | page_cache_release(page); | |
2434 | } | |
2435 | rc = -ENOMEM; | |
2436 | break; | |
2437 | } | |
2438 | ||
2439 | spin_lock(&cifs_file_list_lock); | |
2440 | cifsFileInfo_get(open_file); | |
2441 | spin_unlock(&cifs_file_list_lock); | |
2442 | rdata->cfile = open_file; | |
2443 | rdata->mapping = mapping; | |
2444 | rdata->offset = offset; | |
2445 | rdata->bytes = bytes; | |
2446 | rdata->pid = pid; | |
2447 | list_splice_init(&tmplist, &rdata->pages); | |
2448 | ||
2449 | do { | |
cdff08e7 | 2450 | if (open_file->invalidHandle) { |
15886177 | 2451 | rc = cifs_reopen_file(open_file, true); |
1da177e4 | 2452 | if (rc != 0) |
690c5e31 | 2453 | continue; |
1da177e4 | 2454 | } |
690c5e31 JL |
2455 | rc = cifs_async_readv(rdata); |
2456 | } while (rc == -EAGAIN); | |
1da177e4 | 2457 | |
690c5e31 JL |
2458 | if (rc != 0) { |
2459 | list_for_each_entry_safe(page, tpage, &rdata->pages, | |
2460 | lru) { | |
2461 | list_del(&page->lru); | |
2462 | lru_cache_add_file(page); | |
2463 | unlock_page(page); | |
2464 | page_cache_release(page); | |
1da177e4 | 2465 | } |
690c5e31 | 2466 | cifs_readdata_free(rdata); |
1da177e4 LT |
2467 | break; |
2468 | } | |
1da177e4 LT |
2469 | } |
2470 | ||
1da177e4 LT |
2471 | return rc; |
2472 | } | |
2473 | ||
2474 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2475 | loff_t *poffset) | |
2476 | { | |
2477 | char *read_data; | |
2478 | int rc; | |
2479 | ||
56698236 SJ |
2480 | /* Is the page cached? */ |
2481 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
2482 | if (rc == 0) | |
2483 | goto read_complete; | |
2484 | ||
1da177e4 LT |
2485 | page_cache_get(page); |
2486 | read_data = kmap(page); | |
2487 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2488 | |
1da177e4 | 2489 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2490 | |
1da177e4 LT |
2491 | if (rc < 0) |
2492 | goto io_error; | |
2493 | else | |
b6b38f70 | 2494 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2495 | |
e6a00296 JJS |
2496 | file->f_path.dentry->d_inode->i_atime = |
2497 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2498 | |
1da177e4 LT |
2499 | if (PAGE_CACHE_SIZE > rc) |
2500 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2501 | ||
2502 | flush_dcache_page(page); | |
2503 | SetPageUptodate(page); | |
9dc06558 SJ |
2504 | |
2505 | /* send this page to the cache */ | |
2506 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
2507 | ||
1da177e4 | 2508 | rc = 0; |
fb8c4b14 | 2509 | |
1da177e4 | 2510 | io_error: |
fb8c4b14 | 2511 | kunmap(page); |
1da177e4 | 2512 | page_cache_release(page); |
56698236 SJ |
2513 | |
2514 | read_complete: | |
1da177e4 LT |
2515 | return rc; |
2516 | } | |
2517 | ||
2518 | static int cifs_readpage(struct file *file, struct page *page) | |
2519 | { | |
2520 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2521 | int rc = -EACCES; | |
2522 | int xid; | |
2523 | ||
2524 | xid = GetXid(); | |
2525 | ||
2526 | if (file->private_data == NULL) { | |
0f3bc09e | 2527 | rc = -EBADF; |
1da177e4 | 2528 | FreeXid(xid); |
0f3bc09e | 2529 | return rc; |
1da177e4 LT |
2530 | } |
2531 | ||
b6b38f70 JP |
2532 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2533 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2534 | |
2535 | rc = cifs_readpage_worker(file, page, &offset); | |
2536 | ||
2537 | unlock_page(page); | |
2538 | ||
2539 | FreeXid(xid); | |
2540 | return rc; | |
2541 | } | |
2542 | ||
a403a0a3 SF |
2543 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2544 | { | |
2545 | struct cifsFileInfo *open_file; | |
2546 | ||
4477288a | 2547 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 2548 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 2549 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 2550 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2551 | return 1; |
2552 | } | |
2553 | } | |
4477288a | 2554 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2555 | return 0; |
2556 | } | |
2557 | ||
1da177e4 LT |
2558 | /* We do not want to update the file size from server for inodes |
2559 | open for write - to avoid races with writepage extending | |
2560 | the file - in the future we could consider allowing | |
fb8c4b14 | 2561 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2562 | but this is tricky to do without racing with writebehind |
2563 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2564 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2565 | { |
a403a0a3 | 2566 | if (!cifsInode) |
4b18f2a9 | 2567 | return true; |
50c2f753 | 2568 | |
a403a0a3 SF |
2569 | if (is_inode_writable(cifsInode)) { |
2570 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2571 | struct cifs_sb_info *cifs_sb; |
2572 | ||
c32a0b68 | 2573 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2574 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2575 | /* since no page cache to corrupt on directio |
c32a0b68 | 2576 | we can change size safely */ |
4b18f2a9 | 2577 | return true; |
c32a0b68 SF |
2578 | } |
2579 | ||
fb8c4b14 | 2580 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2581 | return true; |
7ba52631 | 2582 | |
4b18f2a9 | 2583 | return false; |
23e7dd7d | 2584 | } else |
4b18f2a9 | 2585 | return true; |
1da177e4 LT |
2586 | } |
2587 | ||
d9414774 NP |
2588 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2589 | loff_t pos, unsigned len, unsigned flags, | |
2590 | struct page **pagep, void **fsdata) | |
1da177e4 | 2591 | { |
d9414774 NP |
2592 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2593 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2594 | loff_t page_start = pos & PAGE_MASK; |
2595 | loff_t i_size; | |
2596 | struct page *page; | |
2597 | int rc = 0; | |
d9414774 | 2598 | |
b6b38f70 | 2599 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2600 | |
54566b2c | 2601 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2602 | if (!page) { |
2603 | rc = -ENOMEM; | |
2604 | goto out; | |
2605 | } | |
8a236264 | 2606 | |
a98ee8c1 JL |
2607 | if (PageUptodate(page)) |
2608 | goto out; | |
8a236264 | 2609 | |
a98ee8c1 JL |
2610 | /* |
2611 | * If we write a full page it will be up to date, no need to read from | |
2612 | * the server. If the write is short, we'll end up doing a sync write | |
2613 | * instead. | |
2614 | */ | |
2615 | if (len == PAGE_CACHE_SIZE) | |
2616 | goto out; | |
8a236264 | 2617 | |
a98ee8c1 JL |
2618 | /* |
2619 | * optimize away the read when we have an oplock, and we're not | |
2620 | * expecting to use any of the data we'd be reading in. That | |
2621 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2622 | * and the write will cover all of the existing data. | |
2623 | */ | |
2624 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2625 | i_size = i_size_read(mapping->host); | |
2626 | if (page_start >= i_size || | |
2627 | (offset == 0 && (pos + len) >= i_size)) { | |
2628 | zero_user_segments(page, 0, offset, | |
2629 | offset + len, | |
2630 | PAGE_CACHE_SIZE); | |
2631 | /* | |
2632 | * PageChecked means that the parts of the page | |
2633 | * to which we're not writing are considered up | |
2634 | * to date. Once the data is copied to the | |
2635 | * page, it can be set uptodate. | |
2636 | */ | |
2637 | SetPageChecked(page); | |
2638 | goto out; | |
2639 | } | |
2640 | } | |
d9414774 | 2641 | |
a98ee8c1 JL |
2642 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2643 | /* | |
2644 | * might as well read a page, it is fast enough. If we get | |
2645 | * an error, we don't need to return it. cifs_write_end will | |
2646 | * do a sync write instead since PG_uptodate isn't set. | |
2647 | */ | |
2648 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2649 | } else { |
2650 | /* we could try using another file handle if there is one - | |
2651 | but how would we lock it to prevent close of that handle | |
2652 | racing with this read? In any case | |
d9414774 | 2653 | this will be written out by write_end so is fine */ |
1da177e4 | 2654 | } |
a98ee8c1 JL |
2655 | out: |
2656 | *pagep = page; | |
2657 | return rc; | |
1da177e4 LT |
2658 | } |
2659 | ||
85f2d6b4 SJ |
2660 | static int cifs_release_page(struct page *page, gfp_t gfp) |
2661 | { | |
2662 | if (PagePrivate(page)) | |
2663 | return 0; | |
2664 | ||
2665 | return cifs_fscache_release_page(page, gfp); | |
2666 | } | |
2667 | ||
2668 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2669 | { | |
2670 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2671 | ||
2672 | if (offset == 0) | |
2673 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2674 | } | |
2675 | ||
9ad1506b PS |
2676 | static int cifs_launder_page(struct page *page) |
2677 | { | |
2678 | int rc = 0; | |
2679 | loff_t range_start = page_offset(page); | |
2680 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
2681 | struct writeback_control wbc = { | |
2682 | .sync_mode = WB_SYNC_ALL, | |
2683 | .nr_to_write = 0, | |
2684 | .range_start = range_start, | |
2685 | .range_end = range_end, | |
2686 | }; | |
2687 | ||
2688 | cFYI(1, "Launder page: %p", page); | |
2689 | ||
2690 | if (clear_page_dirty_for_io(page)) | |
2691 | rc = cifs_writepage_locked(page, &wbc); | |
2692 | ||
2693 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
2694 | return rc; | |
2695 | } | |
2696 | ||
9b646972 | 2697 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
2698 | { |
2699 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2700 | oplock_break); | |
a5e18bc3 | 2701 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 2702 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
eb4b756b | 2703 | int rc = 0; |
3bc303c2 JL |
2704 | |
2705 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2706 | if (cinode->clientCanCacheRead) |
8737c930 | 2707 | break_lease(inode, O_RDONLY); |
d54ff732 | 2708 | else |
8737c930 | 2709 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2710 | rc = filemap_fdatawrite(inode->i_mapping); |
2711 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
2712 | rc = filemap_fdatawait(inode->i_mapping); |
2713 | mapping_set_error(inode->i_mapping, rc); | |
3bc303c2 JL |
2714 | invalidate_remote_inode(inode); |
2715 | } | |
b6b38f70 | 2716 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2717 | } |
2718 | ||
85160e03 PS |
2719 | rc = cifs_push_locks(cfile); |
2720 | if (rc) | |
2721 | cERROR(1, "Push locks rc = %d", rc); | |
2722 | ||
3bc303c2 JL |
2723 | /* |
2724 | * releasing stale oplock after recent reconnect of smb session using | |
2725 | * a now incorrect file handle is not a data integrity issue but do | |
2726 | * not bother sending an oplock release if session to server still is | |
2727 | * disconnected since oplock already released by the server | |
2728 | */ | |
cdff08e7 | 2729 | if (!cfile->oplock_break_cancelled) { |
03776f45 PS |
2730 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, |
2731 | current->tgid, 0, 0, 0, 0, | |
2732 | LOCKING_ANDX_OPLOCK_RELEASE, false, | |
12fed00d | 2733 | cinode->clientCanCacheRead ? 1 : 0); |
b6b38f70 | 2734 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 2735 | } |
3bc303c2 JL |
2736 | } |
2737 | ||
f5e54d6e | 2738 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2739 | .readpage = cifs_readpage, |
2740 | .readpages = cifs_readpages, | |
2741 | .writepage = cifs_writepage, | |
37c0eb46 | 2742 | .writepages = cifs_writepages, |
d9414774 NP |
2743 | .write_begin = cifs_write_begin, |
2744 | .write_end = cifs_write_end, | |
1da177e4 | 2745 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2746 | .releasepage = cifs_release_page, |
2747 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 2748 | .launder_page = cifs_launder_page, |
1da177e4 | 2749 | }; |
273d81d6 DK |
2750 | |
2751 | /* | |
2752 | * cifs_readpages requires the server to support a buffer large enough to | |
2753 | * contain the header plus one complete page of data. Otherwise, we need | |
2754 | * to leave cifs_readpages out of the address space operations. | |
2755 | */ | |
f5e54d6e | 2756 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2757 | .readpage = cifs_readpage, |
2758 | .writepage = cifs_writepage, | |
2759 | .writepages = cifs_writepages, | |
d9414774 NP |
2760 | .write_begin = cifs_write_begin, |
2761 | .write_end = cifs_write_end, | |
273d81d6 | 2762 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2763 | .releasepage = cifs_release_page, |
2764 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 2765 | .launder_page = cifs_launder_page, |
273d81d6 | 2766 | }; |