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> |
7d308590 | 25 | #include <linux/lm_interface.h> |
b3b94faa DT |
26 | #include <asm/uaccess.h> |
27 | ||
28 | #include "gfs2.h" | |
5c676f6d | 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 | 45 | |
b3b94faa DT |
46 | /* For regular, non-NFS */ |
47 | struct filldir_reg { | |
48 | struct gfs2_sbd *fdr_sbd; | |
49 | int fdr_prefetch; | |
50 | ||
51 | filldir_t fdr_filldir; | |
52 | void *fdr_opaque; | |
53 | }; | |
54 | ||
61a30dcb SW |
55 | /* |
56 | * Most fields left uninitialised to catch anybody who tries to | |
57 | * use them. f_flags set to prevent file_accessed() from touching | |
58 | * any other part of this. Its use is purely as a flag so that we | |
59 | * know (in readpage()) whether or not do to locking. | |
60 | */ | |
dd538c83 | 61 | struct file gfs2_internal_file_sentinel = { |
61a30dcb SW |
62 | .f_flags = O_NOATIME|O_RDONLY, |
63 | }; | |
64 | ||
18ec7d5c SW |
65 | static int gfs2_read_actor(read_descriptor_t *desc, struct page *page, |
66 | unsigned long offset, unsigned long size) | |
67 | { | |
68 | char *kaddr; | |
69 | unsigned long count = desc->count; | |
70 | ||
71 | if (size > count) | |
72 | size = count; | |
73 | ||
74 | kaddr = kmap(page); | |
75 | memcpy(desc->arg.buf, kaddr + offset, size); | |
26c1a574 | 76 | kunmap(page); |
18ec7d5c | 77 | |
26c1a574 SW |
78 | desc->count = count - size; |
79 | desc->written += size; | |
80 | desc->arg.buf += size; | |
81 | return size; | |
18ec7d5c SW |
82 | } |
83 | ||
84 | int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, | |
85 | char *buf, loff_t *pos, unsigned size) | |
86 | { | |
feaa7bba | 87 | struct inode *inode = &ip->i_inode; |
18ec7d5c SW |
88 | read_descriptor_t desc; |
89 | desc.written = 0; | |
90 | desc.arg.buf = buf; | |
91 | desc.count = size; | |
92 | desc.error = 0; | |
61a30dcb | 93 | do_generic_mapping_read(inode->i_mapping, ra_state, |
dd538c83 | 94 | &gfs2_internal_file_sentinel, pos, &desc, |
61a30dcb | 95 | gfs2_read_actor); |
18ec7d5c SW |
96 | return desc.written ? desc.written : desc.error; |
97 | } | |
b3b94faa DT |
98 | |
99 | /** | |
100 | * gfs2_llseek - seek to a location in a file | |
101 | * @file: the file | |
102 | * @offset: the offset | |
103 | * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) | |
104 | * | |
105 | * SEEK_END requires the glock for the file because it references the | |
106 | * file's size. | |
107 | * | |
108 | * Returns: The new offset, or errno | |
109 | */ | |
110 | ||
111 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) | |
112 | { | |
feaa7bba | 113 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
114 | struct gfs2_holder i_gh; |
115 | loff_t error; | |
116 | ||
b3b94faa DT |
117 | if (origin == 2) { |
118 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, | |
119 | &i_gh); | |
120 | if (!error) { | |
121 | error = remote_llseek(file, offset, origin); | |
122 | gfs2_glock_dq_uninit(&i_gh); | |
123 | } | |
124 | } else | |
125 | error = remote_llseek(file, offset, origin); | |
126 | ||
127 | return error; | |
128 | } | |
129 | ||
b3b94faa | 130 | /** |
f0e522a9 | 131 | * filldir_func - Report a directory entry to the caller of gfs2_dir_read() |
b3b94faa DT |
132 | * @opaque: opaque data used by the function |
133 | * @name: the name of the directory entry | |
134 | * @length: the length of the name | |
135 | * @offset: the entry's offset in the directory | |
136 | * @inum: the inode number the entry points to | |
137 | * @type: the type of inode the entry points to | |
138 | * | |
139 | * Returns: 0 on success, 1 if buffer full | |
140 | */ | |
141 | ||
f0e522a9 SW |
142 | static int filldir_func(void *opaque, const char *name, unsigned int length, |
143 | u64 offset, struct gfs2_inum *inum, | |
144 | unsigned int type) | |
b3b94faa DT |
145 | { |
146 | struct filldir_reg *fdr = (struct filldir_reg *)opaque; | |
147 | struct gfs2_sbd *sdp = fdr->fdr_sbd; | |
148 | int error; | |
149 | ||
150 | error = fdr->fdr_filldir(fdr->fdr_opaque, name, length, offset, | |
4340fe62 | 151 | inum->no_addr, type); |
b3b94faa DT |
152 | if (error) |
153 | return 1; | |
154 | ||
155 | if (fdr->fdr_prefetch && !(length == 1 && *name == '.')) { | |
f0e522a9 | 156 | gfs2_glock_prefetch_num(sdp, inum->no_addr, &gfs2_inode_glops, |
b3b94faa | 157 | LM_ST_SHARED, LM_FLAG_TRY | LM_FLAG_ANY); |
f0e522a9 | 158 | gfs2_glock_prefetch_num(sdp, inum->no_addr, &gfs2_iopen_glops, |
b3b94faa DT |
159 | LM_ST_SHARED, LM_FLAG_TRY); |
160 | } | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | /** | |
f0e522a9 | 166 | * gfs2_readdir - Read directory entries from a directory |
b3b94faa DT |
167 | * @file: The directory to read from |
168 | * @dirent: Buffer for dirents | |
169 | * @filldir: Function used to do the copying | |
170 | * | |
171 | * Returns: errno | |
172 | */ | |
173 | ||
f0e522a9 | 174 | static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) |
b3b94faa | 175 | { |
71b86f56 | 176 | struct inode *dir = file->f_mapping->host; |
feaa7bba | 177 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa DT |
178 | struct filldir_reg fdr; |
179 | struct gfs2_holder d_gh; | |
cd915493 | 180 | u64 offset = file->f_pos; |
b3b94faa DT |
181 | int error; |
182 | ||
feaa7bba | 183 | fdr.fdr_sbd = GFS2_SB(dir); |
b3b94faa DT |
184 | fdr.fdr_prefetch = 1; |
185 | fdr.fdr_filldir = filldir; | |
186 | fdr.fdr_opaque = dirent; | |
187 | ||
188 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh); | |
189 | error = gfs2_glock_nq_atime(&d_gh); | |
190 | if (error) { | |
191 | gfs2_holder_uninit(&d_gh); | |
192 | return error; | |
193 | } | |
194 | ||
f0e522a9 | 195 | error = gfs2_dir_read(dir, &offset, &fdr, filldir_func); |
b3b94faa DT |
196 | |
197 | gfs2_glock_dq_uninit(&d_gh); | |
198 | ||
b3b94faa DT |
199 | file->f_pos = offset; |
200 | ||
b3b94faa DT |
201 | return error; |
202 | } | |
203 | ||
b3b94faa | 204 | |
7ea9ea83 SW |
205 | static const u32 iflags_to_gfs2[32] = { |
206 | [iflag_Sync] = GFS2_DIF_SYNC, | |
207 | [iflag_Immutable] = GFS2_DIF_IMMUTABLE, | |
208 | [iflag_Append] = GFS2_DIF_APPENDONLY, | |
209 | [iflag_NoAtime] = GFS2_DIF_NOATIME, | |
210 | [iflag_Index] = GFS2_DIF_EXHASH, | |
211 | [iflag_JournalData] = GFS2_DIF_JDATA, | |
212 | [iflag_DirectIO] = GFS2_DIF_DIRECTIO, | |
71b86f56 SW |
213 | }; |
214 | ||
7ea9ea83 SW |
215 | static const u32 gfs2_to_iflags[32] = { |
216 | [gfs2fl_Sync] = IFLAG_SYNC, | |
217 | [gfs2fl_Immutable] = IFLAG_IMMUTABLE, | |
218 | [gfs2fl_AppendOnly] = IFLAG_APPEND, | |
219 | [gfs2fl_NoAtime] = IFLAG_NOATIME, | |
220 | [gfs2fl_ExHash] = IFLAG_INDEX, | |
221 | [gfs2fl_Jdata] = IFLAG_JOURNAL_DATA, | |
222 | [gfs2fl_Directio] = IFLAG_DIRECTIO, | |
4bcf7091 SW |
223 | [gfs2fl_InheritDirectio] = IFLAG_DIRECTIO, |
224 | [gfs2fl_InheritJdata] = IFLAG_JOURNAL_DATA, | |
7ea9ea83 | 225 | }; |
71b86f56 | 226 | |
b09e593d | 227 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 228 | { |
b09e593d | 229 | struct inode *inode = filp->f_dentry->d_inode; |
feaa7bba | 230 | struct gfs2_inode *ip = GFS2_I(inode); |
71b86f56 SW |
231 | struct gfs2_holder gh; |
232 | int error; | |
7ea9ea83 | 233 | u32 iflags; |
71b86f56 SW |
234 | |
235 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); | |
236 | error = gfs2_glock_nq_m_atime(1, &gh); | |
237 | if (error) | |
238 | return error; | |
907b9bce | 239 | |
7ea9ea83 SW |
240 | iflags = iflags_cvt(gfs2_to_iflags, ip->i_di.di_flags); |
241 | if (put_user(iflags, ptr)) | |
71b86f56 SW |
242 | error = -EFAULT; |
243 | ||
244 | gfs2_glock_dq_m(1, &gh); | |
245 | gfs2_holder_uninit(&gh); | |
246 | return error; | |
247 | } | |
248 | ||
249 | /* Flags that can be set by user space */ | |
250 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
251 | GFS2_DIF_DIRECTIO| \ | |
252 | GFS2_DIF_IMMUTABLE| \ | |
253 | GFS2_DIF_APPENDONLY| \ | |
254 | GFS2_DIF_NOATIME| \ | |
255 | GFS2_DIF_SYNC| \ | |
256 | GFS2_DIF_SYSTEM| \ | |
257 | GFS2_DIF_INHERIT_DIRECTIO| \ | |
258 | GFS2_DIF_INHERIT_JDATA) | |
259 | ||
260 | /** | |
261 | * gfs2_set_flags - set flags on an inode | |
262 | * @inode: The inode | |
263 | * @flags: The flags to set | |
264 | * @mask: Indicates which flags are valid | |
265 | * | |
266 | */ | |
b09e593d | 267 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
71b86f56 | 268 | { |
b09e593d | 269 | struct inode *inode = filp->f_dentry->d_inode; |
feaa7bba SW |
270 | struct gfs2_inode *ip = GFS2_I(inode); |
271 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
71b86f56 SW |
272 | struct buffer_head *bh; |
273 | struct gfs2_holder gh; | |
274 | int error; | |
55eccc6d | 275 | u32 new_flags, flags; |
71b86f56 | 276 | |
71b86f56 | 277 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
52f341cf | 278 | if (error) |
71b86f56 SW |
279 | return error; |
280 | ||
55eccc6d SW |
281 | flags = ip->i_di.di_flags; |
282 | new_flags = (flags & ~mask) | (reqflags & mask); | |
71b86f56 SW |
283 | if ((new_flags ^ flags) == 0) |
284 | goto out; | |
285 | ||
4bcf7091 SW |
286 | if (S_ISDIR(inode->i_mode)) { |
287 | if ((new_flags ^ flags) & GFS2_DIF_JDATA) | |
288 | new_flags ^= (GFS2_DIF_JDATA|GFS2_DIF_INHERIT_JDATA); | |
289 | if ((new_flags ^ flags) & GFS2_DIF_DIRECTIO) | |
290 | new_flags ^= (GFS2_DIF_DIRECTIO|GFS2_DIF_INHERIT_DIRECTIO); | |
291 | } | |
292 | ||
71b86f56 SW |
293 | error = -EINVAL; |
294 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) | |
295 | goto out; | |
296 | ||
71b86f56 SW |
297 | error = -EPERM; |
298 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
299 | goto out; | |
300 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
301 | goto out; | |
907b9bce | 302 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
b9cb9813 | 303 | !capable(CAP_LINUX_IMMUTABLE)) |
71b86f56 | 304 | goto out; |
b9cb9813 | 305 | if (!IS_IMMUTABLE(inode)) { |
faf450ef | 306 | error = permission(inode, MAY_WRITE, NULL); |
b9cb9813 SW |
307 | if (error) |
308 | goto out; | |
309 | } | |
71b86f56 | 310 | |
55eccc6d | 311 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
71b86f56 SW |
312 | if (error) |
313 | goto out; | |
55eccc6d SW |
314 | error = gfs2_meta_inode_buffer(ip, &bh); |
315 | if (error) | |
316 | goto out_trans_end; | |
71b86f56 SW |
317 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
318 | ip->i_di.di_flags = new_flags; | |
319 | gfs2_dinode_out(&ip->i_di, bh->b_data); | |
320 | brelse(bh); | |
55eccc6d SW |
321 | out_trans_end: |
322 | gfs2_trans_end(sdp); | |
71b86f56 SW |
323 | out: |
324 | gfs2_glock_dq_uninit(&gh); | |
325 | return error; | |
326 | } | |
327 | ||
b09e593d | 328 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 329 | { |
7ea9ea83 SW |
330 | u32 iflags, gfsflags; |
331 | if (get_user(iflags, ptr)) | |
71b86f56 | 332 | return -EFAULT; |
7ea9ea83 | 333 | gfsflags = iflags_cvt(iflags_to_gfs2, iflags); |
b09e593d | 334 | return do_gfs2_set_flags(filp, gfsflags, ~0); |
71b86f56 SW |
335 | } |
336 | ||
b09e593d | 337 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
71b86f56 SW |
338 | { |
339 | switch(cmd) { | |
7ea9ea83 | 340 | case IFLAGS_GET_IOC: |
b09e593d | 341 | return gfs2_get_flags(filp, (u32 __user *)arg); |
7ea9ea83 | 342 | case IFLAGS_SET_IOC: |
b09e593d | 343 | return gfs2_set_flags(filp, (u32 __user *)arg); |
71b86f56 SW |
344 | } |
345 | return -ENOTTY; | |
346 | } | |
347 | ||
348 | ||
b3b94faa DT |
349 | /** |
350 | * gfs2_mmap - | |
351 | * @file: The file to map | |
352 | * @vma: The VMA which described the mapping | |
353 | * | |
354 | * Returns: 0 or error code | |
355 | */ | |
356 | ||
357 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
358 | { | |
feaa7bba | 359 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
360 | struct gfs2_holder i_gh; |
361 | int error; | |
362 | ||
b3b94faa DT |
363 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); |
364 | error = gfs2_glock_nq_atime(&i_gh); | |
365 | if (error) { | |
366 | gfs2_holder_uninit(&i_gh); | |
367 | return error; | |
368 | } | |
369 | ||
18ec7d5c SW |
370 | /* This is VM_MAYWRITE instead of VM_WRITE because a call |
371 | to mprotect() can turn on VM_WRITE later. */ | |
372 | ||
373 | if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) == | |
374 | (VM_MAYSHARE | VM_MAYWRITE)) | |
375 | vma->vm_ops = &gfs2_vm_ops_sharewrite; | |
376 | else | |
377 | vma->vm_ops = &gfs2_vm_ops_private; | |
b3b94faa DT |
378 | |
379 | gfs2_glock_dq_uninit(&i_gh); | |
380 | ||
381 | return error; | |
382 | } | |
383 | ||
384 | /** | |
385 | * gfs2_open - open a file | |
386 | * @inode: the inode to open | |
387 | * @file: the struct file for this opening | |
388 | * | |
389 | * Returns: errno | |
390 | */ | |
391 | ||
392 | static int gfs2_open(struct inode *inode, struct file *file) | |
393 | { | |
feaa7bba | 394 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
395 | struct gfs2_holder i_gh; |
396 | struct gfs2_file *fp; | |
397 | int error; | |
398 | ||
b3b94faa DT |
399 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
400 | if (!fp) | |
401 | return -ENOMEM; | |
402 | ||
f55ab26a | 403 | mutex_init(&fp->f_fl_mutex); |
b3b94faa | 404 | |
feaa7bba | 405 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
5c676f6d | 406 | file->private_data = fp; |
b3b94faa DT |
407 | |
408 | if (S_ISREG(ip->i_di.di_mode)) { | |
409 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, | |
410 | &i_gh); | |
411 | if (error) | |
412 | goto fail; | |
413 | ||
414 | if (!(file->f_flags & O_LARGEFILE) && | |
415 | ip->i_di.di_size > MAX_NON_LFS) { | |
416 | error = -EFBIG; | |
417 | goto fail_gunlock; | |
418 | } | |
419 | ||
420 | /* Listen to the Direct I/O flag */ | |
421 | ||
422 | if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO) | |
423 | file->f_flags |= O_DIRECT; | |
424 | ||
b3b94faa DT |
425 | gfs2_glock_dq_uninit(&i_gh); |
426 | } | |
427 | ||
428 | return 0; | |
429 | ||
420b9e5e | 430 | fail_gunlock: |
b3b94faa | 431 | gfs2_glock_dq_uninit(&i_gh); |
420b9e5e | 432 | fail: |
5c676f6d | 433 | file->private_data = NULL; |
b3b94faa | 434 | kfree(fp); |
b3b94faa DT |
435 | return error; |
436 | } | |
437 | ||
438 | /** | |
439 | * gfs2_close - called to close a struct file | |
440 | * @inode: the inode the struct file belongs to | |
441 | * @file: the struct file being closed | |
442 | * | |
443 | * Returns: errno | |
444 | */ | |
445 | ||
446 | static int gfs2_close(struct inode *inode, struct file *file) | |
447 | { | |
5c676f6d | 448 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
b3b94faa DT |
449 | struct gfs2_file *fp; |
450 | ||
5c676f6d SW |
451 | fp = file->private_data; |
452 | file->private_data = NULL; | |
b3b94faa DT |
453 | |
454 | if (gfs2_assert_warn(sdp, fp)) | |
455 | return -EIO; | |
456 | ||
457 | kfree(fp); | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
462 | /** | |
463 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
464 | * @file: the file that points to the dentry (we ignore this) | |
465 | * @dentry: the dentry that points to the inode to sync | |
466 | * | |
467 | * Returns: errno | |
468 | */ | |
469 | ||
470 | static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync) | |
471 | { | |
feaa7bba | 472 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
b3b94faa | 473 | |
b09e593d | 474 | gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl); |
b3b94faa DT |
475 | |
476 | return 0; | |
477 | } | |
478 | ||
479 | /** | |
480 | * gfs2_lock - acquire/release a posix lock on a file | |
481 | * @file: the file pointer | |
482 | * @cmd: either modify or retrieve lock state, possibly wait | |
483 | * @fl: type and range of lock | |
484 | * | |
485 | * Returns: errno | |
486 | */ | |
487 | ||
488 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
489 | { | |
feaa7bba SW |
490 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
491 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
b3b94faa DT |
492 | struct lm_lockname name = |
493 | { .ln_number = ip->i_num.no_addr, | |
494 | .ln_type = LM_TYPE_PLOCK }; | |
495 | ||
b3b94faa DT |
496 | if (!(fl->fl_flags & FL_POSIX)) |
497 | return -ENOLCK; | |
498 | if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
499 | return -ENOLCK; | |
500 | ||
501 | if (sdp->sd_args.ar_localflocks) { | |
502 | if (IS_GETLK(cmd)) { | |
8628de05 SW |
503 | struct file_lock tmp; |
504 | int ret; | |
505 | ret = posix_test_lock(file, fl, &tmp); | |
b3b94faa | 506 | fl->fl_type = F_UNLCK; |
8628de05 SW |
507 | if (ret) |
508 | memcpy(fl, &tmp, sizeof(struct file_lock)); | |
b3b94faa DT |
509 | return 0; |
510 | } else { | |
8628de05 | 511 | return posix_lock_file_wait(file, fl); |
b3b94faa DT |
512 | } |
513 | } | |
514 | ||
515 | if (IS_GETLK(cmd)) | |
516 | return gfs2_lm_plock_get(sdp, &name, file, fl); | |
517 | else if (fl->fl_type == F_UNLCK) | |
518 | return gfs2_lm_punlock(sdp, &name, file, fl); | |
519 | else | |
520 | return gfs2_lm_plock(sdp, &name, file, cmd, fl); | |
521 | } | |
522 | ||
b3b94faa DT |
523 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
524 | { | |
5c676f6d | 525 | struct gfs2_file *fp = file->private_data; |
b3b94faa | 526 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
feaa7bba | 527 | struct gfs2_inode *ip = GFS2_I(file->f_dentry->d_inode); |
b3b94faa DT |
528 | struct gfs2_glock *gl; |
529 | unsigned int state; | |
530 | int flags; | |
531 | int error = 0; | |
532 | ||
533 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
26c1a574 | 534 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; |
b3b94faa | 535 | |
f55ab26a | 536 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
537 | |
538 | gl = fl_gh->gh_gl; | |
539 | if (gl) { | |
540 | if (fl_gh->gh_state == state) | |
541 | goto out; | |
542 | gfs2_glock_hold(gl); | |
543 | flock_lock_file_wait(file, | |
907b9bce | 544 | &(struct file_lock){.fl_type = F_UNLCK}); |
b3b94faa DT |
545 | gfs2_glock_dq_uninit(fl_gh); |
546 | } else { | |
feaa7bba | 547 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), |
b3b94faa DT |
548 | ip->i_num.no_addr, &gfs2_flock_glops, |
549 | CREATE, &gl); | |
550 | if (error) | |
551 | goto out; | |
552 | } | |
553 | ||
554 | gfs2_holder_init(gl, state, flags, fl_gh); | |
555 | gfs2_glock_put(gl); | |
556 | ||
557 | error = gfs2_glock_nq(fl_gh); | |
558 | if (error) { | |
559 | gfs2_holder_uninit(fl_gh); | |
560 | if (error == GLR_TRYFAILED) | |
561 | error = -EAGAIN; | |
562 | } else { | |
563 | error = flock_lock_file_wait(file, fl); | |
feaa7bba | 564 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
b3b94faa DT |
565 | } |
566 | ||
420b9e5e | 567 | out: |
f55ab26a | 568 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
569 | return error; |
570 | } | |
571 | ||
572 | static void do_unflock(struct file *file, struct file_lock *fl) | |
573 | { | |
5c676f6d | 574 | struct gfs2_file *fp = file->private_data; |
b3b94faa DT |
575 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
576 | ||
f55ab26a | 577 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
578 | flock_lock_file_wait(file, fl); |
579 | if (fl_gh->gh_gl) | |
580 | gfs2_glock_dq_uninit(fl_gh); | |
f55ab26a | 581 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
582 | } |
583 | ||
584 | /** | |
585 | * gfs2_flock - acquire/release a flock lock on a file | |
586 | * @file: the file pointer | |
587 | * @cmd: either modify or retrieve lock state, possibly wait | |
588 | * @fl: type and range of lock | |
589 | * | |
590 | * Returns: errno | |
591 | */ | |
592 | ||
593 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
594 | { | |
feaa7bba SW |
595 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
596 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
b3b94faa | 597 | |
b3b94faa DT |
598 | if (!(fl->fl_flags & FL_FLOCK)) |
599 | return -ENOLCK; | |
600 | if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
601 | return -ENOLCK; | |
602 | ||
603 | if (sdp->sd_args.ar_localflocks) | |
604 | return flock_lock_file_wait(file, fl); | |
605 | ||
606 | if (fl->fl_type == F_UNLCK) { | |
607 | do_unflock(file, fl); | |
608 | return 0; | |
d00223f1 | 609 | } else { |
b3b94faa | 610 | return do_flock(file, cmd, fl); |
d00223f1 | 611 | } |
b3b94faa DT |
612 | } |
613 | ||
b0dd9308 | 614 | const struct file_operations gfs2_file_fops = { |
26c1a574 | 615 | .llseek = gfs2_llseek, |
d00223f1 | 616 | .read = do_sync_read, |
26c1a574 | 617 | .aio_read = generic_file_aio_read, |
d00223f1 | 618 | .write = do_sync_write, |
26c1a574 SW |
619 | .aio_write = generic_file_aio_write, |
620 | .unlocked_ioctl = gfs2_ioctl, | |
621 | .mmap = gfs2_mmap, | |
622 | .open = gfs2_open, | |
623 | .release = gfs2_close, | |
624 | .fsync = gfs2_fsync, | |
625 | .lock = gfs2_lock, | |
626 | .sendfile = generic_file_sendfile, | |
627 | .flock = gfs2_flock, | |
628 | .splice_read = generic_file_splice_read, | |
629 | .splice_write = generic_file_splice_write, | |
b3b94faa DT |
630 | }; |
631 | ||
b0dd9308 | 632 | const struct file_operations gfs2_dir_fops = { |
26c1a574 SW |
633 | .readdir = gfs2_readdir, |
634 | .unlocked_ioctl = gfs2_ioctl, | |
635 | .open = gfs2_open, | |
636 | .release = gfs2_close, | |
637 | .fsync = gfs2_fsync, | |
638 | .lock = gfs2_lock, | |
639 | .flock = gfs2_flock, | |
b3b94faa DT |
640 | }; |
641 |