]>
Commit | Line | Data |
---|---|---|
b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/uio.h> | |
17 | #include <linux/blkdev.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/smp_lock.h> | |
18ec7d5c | 20 | #include <linux/fs.h> |
5c676f6d | 21 | #include <linux/gfs2_ondisk.h> |
71b86f56 SW |
22 | #include <linux/ext2_fs.h> |
23 | #include <linux/crc32.h> | |
7ea9ea83 | 24 | #include <linux/iflags.h> |
b3b94faa DT |
25 | #include <asm/uaccess.h> |
26 | ||
27 | #include "gfs2.h" | |
5c676f6d SW |
28 | #include "lm_interface.h" |
29 | #include "incore.h" | |
b3b94faa DT |
30 | #include "bmap.h" |
31 | #include "dir.h" | |
32 | #include "glock.h" | |
33 | #include "glops.h" | |
34 | #include "inode.h" | |
b3b94faa DT |
35 | #include "lm.h" |
36 | #include "log.h" | |
37 | #include "meta_io.h" | |
38 | #include "ops_file.h" | |
39 | #include "ops_vm.h" | |
40 | #include "quota.h" | |
41 | #include "rgrp.h" | |
42 | #include "trans.h" | |
5c676f6d | 43 | #include "util.h" |
71b86f56 | 44 | #include "eaops.h" |
b3b94faa DT |
45 | |
46 | /* "bad" is for NFS support */ | |
47 | struct filldir_bad_entry { | |
48 | char *fbe_name; | |
49 | unsigned int fbe_length; | |
cd915493 | 50 | u64 fbe_offset; |
b3b94faa DT |
51 | struct gfs2_inum fbe_inum; |
52 | unsigned int fbe_type; | |
53 | }; | |
54 | ||
55 | struct filldir_bad { | |
56 | struct gfs2_sbd *fdb_sbd; | |
57 | ||
58 | struct filldir_bad_entry *fdb_entry; | |
59 | unsigned int fdb_entry_num; | |
60 | unsigned int fdb_entry_off; | |
61 | ||
62 | char *fdb_name; | |
63 | unsigned int fdb_name_size; | |
64 | unsigned int fdb_name_off; | |
65 | }; | |
66 | ||
67 | /* For regular, non-NFS */ | |
68 | struct filldir_reg { | |
69 | struct gfs2_sbd *fdr_sbd; | |
70 | int fdr_prefetch; | |
71 | ||
72 | filldir_t fdr_filldir; | |
73 | void *fdr_opaque; | |
74 | }; | |
75 | ||
61a30dcb SW |
76 | /* |
77 | * Most fields left uninitialised to catch anybody who tries to | |
78 | * use them. f_flags set to prevent file_accessed() from touching | |
79 | * any other part of this. Its use is purely as a flag so that we | |
80 | * know (in readpage()) whether or not do to locking. | |
81 | */ | |
82 | struct file gfs2_internal_file_sentinal = { | |
83 | .f_flags = O_NOATIME|O_RDONLY, | |
84 | }; | |
85 | ||
18ec7d5c SW |
86 | static int gfs2_read_actor(read_descriptor_t *desc, struct page *page, |
87 | unsigned long offset, unsigned long size) | |
88 | { | |
89 | char *kaddr; | |
90 | unsigned long count = desc->count; | |
91 | ||
92 | if (size > count) | |
93 | size = count; | |
94 | ||
95 | kaddr = kmap(page); | |
96 | memcpy(desc->arg.buf, kaddr + offset, size); | |
97 | kunmap(page); | |
98 | ||
99 | desc->count = count - size; | |
100 | desc->written += size; | |
101 | desc->arg.buf += size; | |
102 | return size; | |
103 | } | |
104 | ||
105 | int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, | |
106 | char *buf, loff_t *pos, unsigned size) | |
107 | { | |
feaa7bba | 108 | struct inode *inode = &ip->i_inode; |
18ec7d5c SW |
109 | read_descriptor_t desc; |
110 | desc.written = 0; | |
111 | desc.arg.buf = buf; | |
112 | desc.count = size; | |
113 | desc.error = 0; | |
61a30dcb SW |
114 | do_generic_mapping_read(inode->i_mapping, ra_state, |
115 | &gfs2_internal_file_sentinal, pos, &desc, | |
116 | gfs2_read_actor); | |
18ec7d5c SW |
117 | return desc.written ? desc.written : desc.error; |
118 | } | |
b3b94faa DT |
119 | |
120 | /** | |
121 | * gfs2_llseek - seek to a location in a file | |
122 | * @file: the file | |
123 | * @offset: the offset | |
124 | * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) | |
125 | * | |
126 | * SEEK_END requires the glock for the file because it references the | |
127 | * file's size. | |
128 | * | |
129 | * Returns: The new offset, or errno | |
130 | */ | |
131 | ||
132 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) | |
133 | { | |
feaa7bba | 134 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
135 | struct gfs2_holder i_gh; |
136 | loff_t error; | |
137 | ||
b3b94faa DT |
138 | if (origin == 2) { |
139 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, | |
140 | &i_gh); | |
141 | if (!error) { | |
142 | error = remote_llseek(file, offset, origin); | |
143 | gfs2_glock_dq_uninit(&i_gh); | |
144 | } | |
145 | } else | |
146 | error = remote_llseek(file, offset, origin); | |
147 | ||
148 | return error; | |
149 | } | |
150 | ||
b3b94faa DT |
151 | /** |
152 | * filldir_reg_func - Report a directory entry to the caller of gfs2_dir_read() | |
153 | * @opaque: opaque data used by the function | |
154 | * @name: the name of the directory entry | |
155 | * @length: the length of the name | |
156 | * @offset: the entry's offset in the directory | |
157 | * @inum: the inode number the entry points to | |
158 | * @type: the type of inode the entry points to | |
159 | * | |
160 | * Returns: 0 on success, 1 if buffer full | |
161 | */ | |
162 | ||
163 | static int filldir_reg_func(void *opaque, const char *name, unsigned int length, | |
cd915493 | 164 | u64 offset, struct gfs2_inum *inum, |
b3b94faa DT |
165 | unsigned int type) |
166 | { | |
167 | struct filldir_reg *fdr = (struct filldir_reg *)opaque; | |
168 | struct gfs2_sbd *sdp = fdr->fdr_sbd; | |
169 | int error; | |
170 | ||
171 | error = fdr->fdr_filldir(fdr->fdr_opaque, name, length, offset, | |
4340fe62 | 172 | inum->no_addr, type); |
b3b94faa DT |
173 | if (error) |
174 | return 1; | |
175 | ||
176 | if (fdr->fdr_prefetch && !(length == 1 && *name == '.')) { | |
177 | gfs2_glock_prefetch_num(sdp, | |
178 | inum->no_addr, &gfs2_inode_glops, | |
179 | LM_ST_SHARED, LM_FLAG_TRY | LM_FLAG_ANY); | |
180 | gfs2_glock_prefetch_num(sdp, | |
181 | inum->no_addr, &gfs2_iopen_glops, | |
182 | LM_ST_SHARED, LM_FLAG_TRY); | |
183 | } | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | /** | |
189 | * readdir_reg - Read directory entries from a directory | |
190 | * @file: The directory to read from | |
191 | * @dirent: Buffer for dirents | |
192 | * @filldir: Function used to do the copying | |
193 | * | |
194 | * Returns: errno | |
195 | */ | |
196 | ||
197 | static int readdir_reg(struct file *file, void *dirent, filldir_t filldir) | |
198 | { | |
71b86f56 | 199 | struct inode *dir = file->f_mapping->host; |
feaa7bba | 200 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa DT |
201 | struct filldir_reg fdr; |
202 | struct gfs2_holder d_gh; | |
cd915493 | 203 | u64 offset = file->f_pos; |
b3b94faa DT |
204 | int error; |
205 | ||
feaa7bba | 206 | fdr.fdr_sbd = GFS2_SB(dir); |
b3b94faa DT |
207 | fdr.fdr_prefetch = 1; |
208 | fdr.fdr_filldir = filldir; | |
209 | fdr.fdr_opaque = dirent; | |
210 | ||
211 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh); | |
212 | error = gfs2_glock_nq_atime(&d_gh); | |
213 | if (error) { | |
214 | gfs2_holder_uninit(&d_gh); | |
215 | return error; | |
216 | } | |
217 | ||
71b86f56 | 218 | error = gfs2_dir_read(dir, &offset, &fdr, filldir_reg_func); |
b3b94faa DT |
219 | |
220 | gfs2_glock_dq_uninit(&d_gh); | |
221 | ||
222 | file->f_pos = offset; | |
223 | ||
224 | return error; | |
225 | } | |
226 | ||
227 | /** | |
228 | * filldir_bad_func - Report a directory entry to the caller of gfs2_dir_read() | |
229 | * @opaque: opaque data used by the function | |
230 | * @name: the name of the directory entry | |
231 | * @length: the length of the name | |
232 | * @offset: the entry's offset in the directory | |
233 | * @inum: the inode number the entry points to | |
234 | * @type: the type of inode the entry points to | |
235 | * | |
236 | * For supporting NFS. | |
237 | * | |
238 | * Returns: 0 on success, 1 if buffer full | |
239 | */ | |
240 | ||
241 | static int filldir_bad_func(void *opaque, const char *name, unsigned int length, | |
cd915493 | 242 | u64 offset, struct gfs2_inum *inum, |
b3b94faa DT |
243 | unsigned int type) |
244 | { | |
245 | struct filldir_bad *fdb = (struct filldir_bad *)opaque; | |
246 | struct gfs2_sbd *sdp = fdb->fdb_sbd; | |
247 | struct filldir_bad_entry *fbe; | |
248 | ||
249 | if (fdb->fdb_entry_off == fdb->fdb_entry_num || | |
250 | fdb->fdb_name_off + length > fdb->fdb_name_size) | |
251 | return 1; | |
252 | ||
253 | fbe = &fdb->fdb_entry[fdb->fdb_entry_off]; | |
254 | fbe->fbe_name = fdb->fdb_name + fdb->fdb_name_off; | |
255 | memcpy(fbe->fbe_name, name, length); | |
256 | fbe->fbe_length = length; | |
257 | fbe->fbe_offset = offset; | |
258 | fbe->fbe_inum = *inum; | |
259 | fbe->fbe_type = type; | |
260 | ||
261 | fdb->fdb_entry_off++; | |
262 | fdb->fdb_name_off += length; | |
263 | ||
264 | if (!(length == 1 && *name == '.')) { | |
265 | gfs2_glock_prefetch_num(sdp, | |
266 | inum->no_addr, &gfs2_inode_glops, | |
267 | LM_ST_SHARED, LM_FLAG_TRY | LM_FLAG_ANY); | |
268 | gfs2_glock_prefetch_num(sdp, | |
269 | inum->no_addr, &gfs2_iopen_glops, | |
270 | LM_ST_SHARED, LM_FLAG_TRY); | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | /** | |
277 | * readdir_bad - Read directory entries from a directory | |
278 | * @file: The directory to read from | |
279 | * @dirent: Buffer for dirents | |
280 | * @filldir: Function used to do the copying | |
281 | * | |
282 | * For supporting NFS. | |
283 | * | |
284 | * Returns: errno | |
285 | */ | |
286 | ||
287 | static int readdir_bad(struct file *file, void *dirent, filldir_t filldir) | |
288 | { | |
71b86f56 | 289 | struct inode *dir = file->f_mapping->host; |
feaa7bba SW |
290 | struct gfs2_inode *dip = GFS2_I(dir); |
291 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
292 | struct filldir_reg fdr; |
293 | unsigned int entries, size; | |
294 | struct filldir_bad *fdb; | |
295 | struct gfs2_holder d_gh; | |
cd915493 | 296 | u64 offset = file->f_pos; |
b3b94faa DT |
297 | unsigned int x; |
298 | struct filldir_bad_entry *fbe; | |
299 | int error; | |
300 | ||
301 | entries = gfs2_tune_get(sdp, gt_entries_per_readdir); | |
302 | size = sizeof(struct filldir_bad) + | |
303 | entries * (sizeof(struct filldir_bad_entry) + GFS2_FAST_NAME_SIZE); | |
304 | ||
305 | fdb = kzalloc(size, GFP_KERNEL); | |
306 | if (!fdb) | |
307 | return -ENOMEM; | |
308 | ||
309 | fdb->fdb_sbd = sdp; | |
310 | fdb->fdb_entry = (struct filldir_bad_entry *)(fdb + 1); | |
311 | fdb->fdb_entry_num = entries; | |
312 | fdb->fdb_name = ((char *)fdb) + sizeof(struct filldir_bad) + | |
313 | entries * sizeof(struct filldir_bad_entry); | |
314 | fdb->fdb_name_size = entries * GFS2_FAST_NAME_SIZE; | |
315 | ||
316 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh); | |
317 | error = gfs2_glock_nq_atime(&d_gh); | |
318 | if (error) { | |
319 | gfs2_holder_uninit(&d_gh); | |
320 | goto out; | |
321 | } | |
322 | ||
71b86f56 | 323 | error = gfs2_dir_read(dir, &offset, fdb, filldir_bad_func); |
b3b94faa DT |
324 | |
325 | gfs2_glock_dq_uninit(&d_gh); | |
326 | ||
327 | fdr.fdr_sbd = sdp; | |
328 | fdr.fdr_prefetch = 0; | |
329 | fdr.fdr_filldir = filldir; | |
330 | fdr.fdr_opaque = dirent; | |
331 | ||
332 | for (x = 0; x < fdb->fdb_entry_off; x++) { | |
333 | fbe = &fdb->fdb_entry[x]; | |
334 | ||
335 | error = filldir_reg_func(&fdr, | |
336 | fbe->fbe_name, fbe->fbe_length, | |
337 | fbe->fbe_offset, | |
338 | &fbe->fbe_inum, fbe->fbe_type); | |
339 | if (error) { | |
340 | file->f_pos = fbe->fbe_offset; | |
341 | error = 0; | |
342 | goto out; | |
343 | } | |
344 | } | |
345 | ||
346 | file->f_pos = offset; | |
347 | ||
a91ea69f | 348 | out: |
b3b94faa | 349 | kfree(fdb); |
b3b94faa DT |
350 | return error; |
351 | } | |
352 | ||
353 | /** | |
354 | * gfs2_readdir - Read directory entries from a directory | |
355 | * @file: The directory to read from | |
356 | * @dirent: Buffer for dirents | |
357 | * @filldir: Function used to do the copying | |
358 | * | |
359 | * Returns: errno | |
360 | */ | |
361 | ||
362 | static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) | |
363 | { | |
364 | int error; | |
365 | ||
b3b94faa DT |
366 | if (strcmp(current->comm, "nfsd") != 0) |
367 | error = readdir_reg(file, dirent, filldir); | |
368 | else | |
369 | error = readdir_bad(file, dirent, filldir); | |
370 | ||
371 | return error; | |
372 | } | |
373 | ||
7ea9ea83 SW |
374 | static const u32 iflags_to_gfs2[32] = { |
375 | [iflag_Sync] = GFS2_DIF_SYNC, | |
376 | [iflag_Immutable] = GFS2_DIF_IMMUTABLE, | |
377 | [iflag_Append] = GFS2_DIF_APPENDONLY, | |
378 | [iflag_NoAtime] = GFS2_DIF_NOATIME, | |
379 | [iflag_Index] = GFS2_DIF_EXHASH, | |
380 | [iflag_JournalData] = GFS2_DIF_JDATA, | |
381 | [iflag_DirectIO] = GFS2_DIF_DIRECTIO, | |
71b86f56 SW |
382 | }; |
383 | ||
7ea9ea83 SW |
384 | static const u32 gfs2_to_iflags[32] = { |
385 | [gfs2fl_Sync] = IFLAG_SYNC, | |
386 | [gfs2fl_Immutable] = IFLAG_IMMUTABLE, | |
387 | [gfs2fl_AppendOnly] = IFLAG_APPEND, | |
388 | [gfs2fl_NoAtime] = IFLAG_NOATIME, | |
389 | [gfs2fl_ExHash] = IFLAG_INDEX, | |
390 | [gfs2fl_Jdata] = IFLAG_JOURNAL_DATA, | |
391 | [gfs2fl_Directio] = IFLAG_DIRECTIO, | |
4bcf7091 SW |
392 | [gfs2fl_InheritDirectio] = IFLAG_DIRECTIO, |
393 | [gfs2fl_InheritJdata] = IFLAG_JOURNAL_DATA, | |
7ea9ea83 | 394 | }; |
71b86f56 | 395 | |
b09e593d | 396 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 397 | { |
b09e593d | 398 | struct inode *inode = filp->f_dentry->d_inode; |
feaa7bba | 399 | struct gfs2_inode *ip = GFS2_I(inode); |
71b86f56 SW |
400 | struct gfs2_holder gh; |
401 | int error; | |
7ea9ea83 | 402 | u32 iflags; |
71b86f56 SW |
403 | |
404 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); | |
405 | error = gfs2_glock_nq_m_atime(1, &gh); | |
406 | if (error) | |
407 | return error; | |
55eccc6d | 408 | |
7ea9ea83 SW |
409 | iflags = iflags_cvt(gfs2_to_iflags, ip->i_di.di_flags); |
410 | if (put_user(iflags, ptr)) | |
71b86f56 SW |
411 | error = -EFAULT; |
412 | ||
413 | gfs2_glock_dq_m(1, &gh); | |
414 | gfs2_holder_uninit(&gh); | |
415 | return error; | |
416 | } | |
417 | ||
418 | /* Flags that can be set by user space */ | |
419 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
420 | GFS2_DIF_DIRECTIO| \ | |
421 | GFS2_DIF_IMMUTABLE| \ | |
422 | GFS2_DIF_APPENDONLY| \ | |
423 | GFS2_DIF_NOATIME| \ | |
424 | GFS2_DIF_SYNC| \ | |
425 | GFS2_DIF_SYSTEM| \ | |
426 | GFS2_DIF_INHERIT_DIRECTIO| \ | |
427 | GFS2_DIF_INHERIT_JDATA) | |
428 | ||
429 | /** | |
430 | * gfs2_set_flags - set flags on an inode | |
431 | * @inode: The inode | |
432 | * @flags: The flags to set | |
433 | * @mask: Indicates which flags are valid | |
434 | * | |
435 | */ | |
b09e593d | 436 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
71b86f56 | 437 | { |
b09e593d | 438 | struct inode *inode = filp->f_dentry->d_inode; |
feaa7bba SW |
439 | struct gfs2_inode *ip = GFS2_I(inode); |
440 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
71b86f56 SW |
441 | struct buffer_head *bh; |
442 | struct gfs2_holder gh; | |
443 | int error; | |
55eccc6d | 444 | u32 new_flags, flags; |
71b86f56 | 445 | |
71b86f56 | 446 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
52f341cf | 447 | if (error) |
71b86f56 SW |
448 | return error; |
449 | ||
55eccc6d SW |
450 | flags = ip->i_di.di_flags; |
451 | new_flags = (flags & ~mask) | (reqflags & mask); | |
71b86f56 SW |
452 | if ((new_flags ^ flags) == 0) |
453 | goto out; | |
454 | ||
4bcf7091 SW |
455 | if (S_ISDIR(inode->i_mode)) { |
456 | if ((new_flags ^ flags) & GFS2_DIF_JDATA) | |
457 | new_flags ^= (GFS2_DIF_JDATA|GFS2_DIF_INHERIT_JDATA); | |
458 | if ((new_flags ^ flags) & GFS2_DIF_DIRECTIO) | |
459 | new_flags ^= (GFS2_DIF_DIRECTIO|GFS2_DIF_INHERIT_DIRECTIO); | |
460 | } | |
461 | ||
71b86f56 SW |
462 | error = -EINVAL; |
463 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) | |
464 | goto out; | |
465 | ||
71b86f56 SW |
466 | error = -EPERM; |
467 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
468 | goto out; | |
469 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
470 | goto out; | |
b9cb9813 SW |
471 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
472 | !capable(CAP_LINUX_IMMUTABLE)) | |
71b86f56 | 473 | goto out; |
b9cb9813 | 474 | if (!IS_IMMUTABLE(inode)) { |
faf450ef | 475 | error = permission(inode, MAY_WRITE, NULL); |
b9cb9813 SW |
476 | if (error) |
477 | goto out; | |
478 | } | |
71b86f56 | 479 | |
55eccc6d | 480 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
71b86f56 SW |
481 | if (error) |
482 | goto out; | |
55eccc6d SW |
483 | error = gfs2_meta_inode_buffer(ip, &bh); |
484 | if (error) | |
485 | goto out_trans_end; | |
71b86f56 SW |
486 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
487 | ip->i_di.di_flags = new_flags; | |
488 | gfs2_dinode_out(&ip->i_di, bh->b_data); | |
489 | brelse(bh); | |
55eccc6d SW |
490 | out_trans_end: |
491 | gfs2_trans_end(sdp); | |
71b86f56 SW |
492 | out: |
493 | gfs2_glock_dq_uninit(&gh); | |
494 | return error; | |
495 | } | |
496 | ||
b09e593d | 497 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 498 | { |
7ea9ea83 SW |
499 | u32 iflags, gfsflags; |
500 | if (get_user(iflags, ptr)) | |
71b86f56 | 501 | return -EFAULT; |
7ea9ea83 | 502 | gfsflags = iflags_cvt(iflags_to_gfs2, iflags); |
b09e593d | 503 | return do_gfs2_set_flags(filp, gfsflags, ~0); |
71b86f56 SW |
504 | } |
505 | ||
b09e593d | 506 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
71b86f56 SW |
507 | { |
508 | switch(cmd) { | |
7ea9ea83 | 509 | case IFLAGS_GET_IOC: |
b09e593d | 510 | return gfs2_get_flags(filp, (u32 __user *)arg); |
7ea9ea83 | 511 | case IFLAGS_SET_IOC: |
b09e593d | 512 | return gfs2_set_flags(filp, (u32 __user *)arg); |
71b86f56 SW |
513 | } |
514 | return -ENOTTY; | |
515 | } | |
516 | ||
517 | ||
b3b94faa DT |
518 | /** |
519 | * gfs2_mmap - | |
520 | * @file: The file to map | |
521 | * @vma: The VMA which described the mapping | |
522 | * | |
523 | * Returns: 0 or error code | |
524 | */ | |
525 | ||
526 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
527 | { | |
feaa7bba | 528 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
529 | struct gfs2_holder i_gh; |
530 | int error; | |
531 | ||
b3b94faa DT |
532 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); |
533 | error = gfs2_glock_nq_atime(&i_gh); | |
534 | if (error) { | |
535 | gfs2_holder_uninit(&i_gh); | |
536 | return error; | |
537 | } | |
538 | ||
18ec7d5c SW |
539 | /* This is VM_MAYWRITE instead of VM_WRITE because a call |
540 | to mprotect() can turn on VM_WRITE later. */ | |
541 | ||
542 | if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) == | |
543 | (VM_MAYSHARE | VM_MAYWRITE)) | |
544 | vma->vm_ops = &gfs2_vm_ops_sharewrite; | |
545 | else | |
546 | vma->vm_ops = &gfs2_vm_ops_private; | |
b3b94faa DT |
547 | |
548 | gfs2_glock_dq_uninit(&i_gh); | |
549 | ||
550 | return error; | |
551 | } | |
552 | ||
553 | /** | |
554 | * gfs2_open - open a file | |
555 | * @inode: the inode to open | |
556 | * @file: the struct file for this opening | |
557 | * | |
558 | * Returns: errno | |
559 | */ | |
560 | ||
561 | static int gfs2_open(struct inode *inode, struct file *file) | |
562 | { | |
feaa7bba | 563 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
564 | struct gfs2_holder i_gh; |
565 | struct gfs2_file *fp; | |
566 | int error; | |
567 | ||
b3b94faa DT |
568 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
569 | if (!fp) | |
570 | return -ENOMEM; | |
571 | ||
f55ab26a | 572 | mutex_init(&fp->f_fl_mutex); |
b3b94faa | 573 | |
feaa7bba | 574 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
5c676f6d | 575 | file->private_data = fp; |
b3b94faa DT |
576 | |
577 | if (S_ISREG(ip->i_di.di_mode)) { | |
578 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, | |
579 | &i_gh); | |
580 | if (error) | |
581 | goto fail; | |
582 | ||
583 | if (!(file->f_flags & O_LARGEFILE) && | |
584 | ip->i_di.di_size > MAX_NON_LFS) { | |
585 | error = -EFBIG; | |
586 | goto fail_gunlock; | |
587 | } | |
588 | ||
589 | /* Listen to the Direct I/O flag */ | |
590 | ||
591 | if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO) | |
592 | file->f_flags |= O_DIRECT; | |
593 | ||
b3b94faa DT |
594 | gfs2_glock_dq_uninit(&i_gh); |
595 | } | |
596 | ||
597 | return 0; | |
598 | ||
420b9e5e | 599 | fail_gunlock: |
b3b94faa | 600 | gfs2_glock_dq_uninit(&i_gh); |
420b9e5e | 601 | fail: |
5c676f6d | 602 | file->private_data = NULL; |
b3b94faa | 603 | kfree(fp); |
b3b94faa DT |
604 | return error; |
605 | } | |
606 | ||
607 | /** | |
608 | * gfs2_close - called to close a struct file | |
609 | * @inode: the inode the struct file belongs to | |
610 | * @file: the struct file being closed | |
611 | * | |
612 | * Returns: errno | |
613 | */ | |
614 | ||
615 | static int gfs2_close(struct inode *inode, struct file *file) | |
616 | { | |
5c676f6d | 617 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
b3b94faa DT |
618 | struct gfs2_file *fp; |
619 | ||
5c676f6d SW |
620 | fp = file->private_data; |
621 | file->private_data = NULL; | |
b3b94faa DT |
622 | |
623 | if (gfs2_assert_warn(sdp, fp)) | |
624 | return -EIO; | |
625 | ||
626 | kfree(fp); | |
627 | ||
628 | return 0; | |
629 | } | |
630 | ||
631 | /** | |
632 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
633 | * @file: the file that points to the dentry (we ignore this) | |
634 | * @dentry: the dentry that points to the inode to sync | |
635 | * | |
636 | * Returns: errno | |
637 | */ | |
638 | ||
639 | static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync) | |
640 | { | |
feaa7bba | 641 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
b3b94faa | 642 | |
b09e593d | 643 | gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl); |
b3b94faa DT |
644 | |
645 | return 0; | |
646 | } | |
647 | ||
648 | /** | |
649 | * gfs2_lock - acquire/release a posix lock on a file | |
650 | * @file: the file pointer | |
651 | * @cmd: either modify or retrieve lock state, possibly wait | |
652 | * @fl: type and range of lock | |
653 | * | |
654 | * Returns: errno | |
655 | */ | |
656 | ||
657 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
658 | { | |
feaa7bba SW |
659 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
660 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
b3b94faa DT |
661 | struct lm_lockname name = |
662 | { .ln_number = ip->i_num.no_addr, | |
663 | .ln_type = LM_TYPE_PLOCK }; | |
664 | ||
b3b94faa DT |
665 | if (!(fl->fl_flags & FL_POSIX)) |
666 | return -ENOLCK; | |
667 | if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
668 | return -ENOLCK; | |
669 | ||
670 | if (sdp->sd_args.ar_localflocks) { | |
671 | if (IS_GETLK(cmd)) { | |
8628de05 SW |
672 | struct file_lock tmp; |
673 | int ret; | |
674 | ret = posix_test_lock(file, fl, &tmp); | |
b3b94faa | 675 | fl->fl_type = F_UNLCK; |
8628de05 SW |
676 | if (ret) |
677 | memcpy(fl, &tmp, sizeof(struct file_lock)); | |
b3b94faa DT |
678 | return 0; |
679 | } else { | |
8628de05 | 680 | return posix_lock_file_wait(file, fl); |
b3b94faa DT |
681 | } |
682 | } | |
683 | ||
684 | if (IS_GETLK(cmd)) | |
685 | return gfs2_lm_plock_get(sdp, &name, file, fl); | |
686 | else if (fl->fl_type == F_UNLCK) | |
687 | return gfs2_lm_punlock(sdp, &name, file, fl); | |
688 | else | |
689 | return gfs2_lm_plock(sdp, &name, file, cmd, fl); | |
690 | } | |
691 | ||
b3b94faa DT |
692 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
693 | { | |
5c676f6d | 694 | struct gfs2_file *fp = file->private_data; |
b3b94faa | 695 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
feaa7bba | 696 | struct gfs2_inode *ip = GFS2_I(file->f_dentry->d_inode); |
b3b94faa DT |
697 | struct gfs2_glock *gl; |
698 | unsigned int state; | |
699 | int flags; | |
700 | int error = 0; | |
701 | ||
702 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
703 | flags = ((IS_SETLKW(cmd)) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; | |
704 | ||
f55ab26a | 705 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
706 | |
707 | gl = fl_gh->gh_gl; | |
708 | if (gl) { | |
709 | if (fl_gh->gh_state == state) | |
710 | goto out; | |
711 | gfs2_glock_hold(gl); | |
712 | flock_lock_file_wait(file, | |
713 | &(struct file_lock){.fl_type = F_UNLCK}); | |
714 | gfs2_glock_dq_uninit(fl_gh); | |
715 | } else { | |
feaa7bba | 716 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), |
b3b94faa DT |
717 | ip->i_num.no_addr, &gfs2_flock_glops, |
718 | CREATE, &gl); | |
719 | if (error) | |
720 | goto out; | |
721 | } | |
722 | ||
723 | gfs2_holder_init(gl, state, flags, fl_gh); | |
724 | gfs2_glock_put(gl); | |
725 | ||
726 | error = gfs2_glock_nq(fl_gh); | |
727 | if (error) { | |
728 | gfs2_holder_uninit(fl_gh); | |
729 | if (error == GLR_TRYFAILED) | |
730 | error = -EAGAIN; | |
731 | } else { | |
732 | error = flock_lock_file_wait(file, fl); | |
feaa7bba | 733 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
b3b94faa DT |
734 | } |
735 | ||
420b9e5e | 736 | out: |
f55ab26a | 737 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
738 | return error; |
739 | } | |
740 | ||
741 | static void do_unflock(struct file *file, struct file_lock *fl) | |
742 | { | |
5c676f6d | 743 | struct gfs2_file *fp = file->private_data; |
b3b94faa DT |
744 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
745 | ||
f55ab26a | 746 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
747 | flock_lock_file_wait(file, fl); |
748 | if (fl_gh->gh_gl) | |
749 | gfs2_glock_dq_uninit(fl_gh); | |
f55ab26a | 750 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
751 | } |
752 | ||
753 | /** | |
754 | * gfs2_flock - acquire/release a flock lock on a file | |
755 | * @file: the file pointer | |
756 | * @cmd: either modify or retrieve lock state, possibly wait | |
757 | * @fl: type and range of lock | |
758 | * | |
759 | * Returns: errno | |
760 | */ | |
761 | ||
762 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
763 | { | |
feaa7bba SW |
764 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
765 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
b3b94faa | 766 | |
b3b94faa DT |
767 | if (!(fl->fl_flags & FL_FLOCK)) |
768 | return -ENOLCK; | |
769 | if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
770 | return -ENOLCK; | |
771 | ||
772 | if (sdp->sd_args.ar_localflocks) | |
773 | return flock_lock_file_wait(file, fl); | |
774 | ||
775 | if (fl->fl_type == F_UNLCK) { | |
776 | do_unflock(file, fl); | |
777 | return 0; | |
778 | } else | |
779 | return do_flock(file, cmd, fl); | |
780 | } | |
781 | ||
b0dd9308 | 782 | const struct file_operations gfs2_file_fops = { |
b3b94faa | 783 | .llseek = gfs2_llseek, |
a9e5f4d0 SW |
784 | .read = generic_file_read, |
785 | .readv = generic_file_readv, | |
786 | .aio_read = generic_file_aio_read, | |
18ec7d5c SW |
787 | .write = generic_file_write, |
788 | .writev = generic_file_writev, | |
789 | .aio_write = generic_file_aio_write, | |
b09e593d | 790 | .unlocked_ioctl = gfs2_ioctl, |
b3b94faa DT |
791 | .mmap = gfs2_mmap, |
792 | .open = gfs2_open, | |
793 | .release = gfs2_close, | |
794 | .fsync = gfs2_fsync, | |
795 | .lock = gfs2_lock, | |
a53311d4 | 796 | .sendfile = generic_file_sendfile, |
b3b94faa | 797 | .flock = gfs2_flock, |
8628de05 SW |
798 | .splice_read = generic_file_splice_read, |
799 | .splice_write = generic_file_splice_write, | |
b3b94faa DT |
800 | }; |
801 | ||
b0dd9308 | 802 | const struct file_operations gfs2_dir_fops = { |
b3b94faa | 803 | .readdir = gfs2_readdir, |
b09e593d | 804 | .unlocked_ioctl = gfs2_ioctl, |
b3b94faa DT |
805 | .open = gfs2_open, |
806 | .release = gfs2_close, | |
807 | .fsync = gfs2_fsync, | |
808 | .lock = gfs2_lock, | |
809 | .flock = gfs2_flock, | |
810 | }; | |
811 |