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 | ||
b3b94faa DT |
10 | #include <linux/slab.h> |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/completion.h> | |
13 | #include <linux/buffer_head.h> | |
14 | #include <linux/pagemap.h> | |
15 | #include <linux/uio.h> | |
16 | #include <linux/blkdev.h> | |
17 | #include <linux/mm.h> | |
18ec7d5c | 18 | #include <linux/fs.h> |
5c676f6d | 19 | #include <linux/gfs2_ondisk.h> |
71b86f56 SW |
20 | #include <linux/ext2_fs.h> |
21 | #include <linux/crc32.h> | |
7d308590 | 22 | #include <linux/lm_interface.h> |
33c3de32 | 23 | #include <linux/writeback.h> |
b3b94faa DT |
24 | #include <asm/uaccess.h> |
25 | ||
26 | #include "gfs2.h" | |
5c676f6d | 27 | #include "incore.h" |
b3b94faa DT |
28 | #include "bmap.h" |
29 | #include "dir.h" | |
30 | #include "glock.h" | |
31 | #include "glops.h" | |
32 | #include "inode.h" | |
b3b94faa DT |
33 | #include "lm.h" |
34 | #include "log.h" | |
35 | #include "meta_io.h" | |
36 | #include "ops_file.h" | |
37 | #include "ops_vm.h" | |
38 | #include "quota.h" | |
39 | #include "rgrp.h" | |
40 | #include "trans.h" | |
5c676f6d | 41 | #include "util.h" |
71b86f56 | 42 | #include "eaops.h" |
b3b94faa | 43 | |
61a30dcb SW |
44 | /* |
45 | * Most fields left uninitialised to catch anybody who tries to | |
46 | * use them. f_flags set to prevent file_accessed() from touching | |
47 | * any other part of this. Its use is purely as a flag so that we | |
48 | * know (in readpage()) whether or not do to locking. | |
49 | */ | |
dd538c83 | 50 | struct file gfs2_internal_file_sentinel = { |
61a30dcb SW |
51 | .f_flags = O_NOATIME|O_RDONLY, |
52 | }; | |
53 | ||
18ec7d5c SW |
54 | static int gfs2_read_actor(read_descriptor_t *desc, struct page *page, |
55 | unsigned long offset, unsigned long size) | |
56 | { | |
57 | char *kaddr; | |
58 | unsigned long count = desc->count; | |
59 | ||
60 | if (size > count) | |
61 | size = count; | |
62 | ||
63 | kaddr = kmap(page); | |
9c9ab3d5 | 64 | memcpy(desc->arg.data, kaddr + offset, size); |
26c1a574 | 65 | kunmap(page); |
18ec7d5c | 66 | |
26c1a574 SW |
67 | desc->count = count - size; |
68 | desc->written += size; | |
69 | desc->arg.buf += size; | |
70 | return size; | |
18ec7d5c SW |
71 | } |
72 | ||
73 | int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, | |
74 | char *buf, loff_t *pos, unsigned size) | |
75 | { | |
feaa7bba | 76 | struct inode *inode = &ip->i_inode; |
18ec7d5c SW |
77 | read_descriptor_t desc; |
78 | desc.written = 0; | |
9c9ab3d5 | 79 | desc.arg.data = buf; |
18ec7d5c SW |
80 | desc.count = size; |
81 | desc.error = 0; | |
61a30dcb | 82 | do_generic_mapping_read(inode->i_mapping, ra_state, |
dd538c83 | 83 | &gfs2_internal_file_sentinel, pos, &desc, |
61a30dcb | 84 | gfs2_read_actor); |
18ec7d5c SW |
85 | return desc.written ? desc.written : desc.error; |
86 | } | |
b3b94faa DT |
87 | |
88 | /** | |
89 | * gfs2_llseek - seek to a location in a file | |
90 | * @file: the file | |
91 | * @offset: the offset | |
92 | * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) | |
93 | * | |
94 | * SEEK_END requires the glock for the file because it references the | |
95 | * file's size. | |
96 | * | |
97 | * Returns: The new offset, or errno | |
98 | */ | |
99 | ||
100 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) | |
101 | { | |
feaa7bba | 102 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
103 | struct gfs2_holder i_gh; |
104 | loff_t error; | |
105 | ||
b3b94faa DT |
106 | if (origin == 2) { |
107 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, | |
108 | &i_gh); | |
109 | if (!error) { | |
110 | error = remote_llseek(file, offset, origin); | |
111 | gfs2_glock_dq_uninit(&i_gh); | |
112 | } | |
113 | } else | |
114 | error = remote_llseek(file, offset, origin); | |
115 | ||
116 | return error; | |
117 | } | |
118 | ||
b3b94faa | 119 | /** |
f0e522a9 | 120 | * gfs2_readdir - Read directory entries from a directory |
b3b94faa DT |
121 | * @file: The directory to read from |
122 | * @dirent: Buffer for dirents | |
123 | * @filldir: Function used to do the copying | |
124 | * | |
125 | * Returns: errno | |
126 | */ | |
127 | ||
f0e522a9 | 128 | static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) |
b3b94faa | 129 | { |
71b86f56 | 130 | struct inode *dir = file->f_mapping->host; |
feaa7bba | 131 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 132 | struct gfs2_holder d_gh; |
cd915493 | 133 | u64 offset = file->f_pos; |
b3b94faa DT |
134 | int error; |
135 | ||
b3b94faa DT |
136 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh); |
137 | error = gfs2_glock_nq_atime(&d_gh); | |
138 | if (error) { | |
139 | gfs2_holder_uninit(&d_gh); | |
140 | return error; | |
141 | } | |
142 | ||
3699e3a4 | 143 | error = gfs2_dir_read(dir, &offset, dirent, filldir); |
b3b94faa DT |
144 | |
145 | gfs2_glock_dq_uninit(&d_gh); | |
146 | ||
b3b94faa DT |
147 | file->f_pos = offset; |
148 | ||
b3b94faa DT |
149 | return error; |
150 | } | |
151 | ||
128e5eba SW |
152 | /** |
153 | * fsflags_cvt | |
154 | * @table: A table of 32 u32 flags | |
155 | * @val: a 32 bit value to convert | |
156 | * | |
157 | * This function can be used to convert between fsflags values and | |
158 | * GFS2's own flags values. | |
159 | * | |
160 | * Returns: the converted flags | |
161 | */ | |
162 | static u32 fsflags_cvt(const u32 *table, u32 val) | |
163 | { | |
164 | u32 res = 0; | |
165 | while(val) { | |
166 | if (val & 1) | |
167 | res |= *table; | |
168 | table++; | |
169 | val >>= 1; | |
170 | } | |
171 | return res; | |
172 | } | |
b3b94faa | 173 | |
128e5eba SW |
174 | static const u32 fsflags_to_gfs2[32] = { |
175 | [3] = GFS2_DIF_SYNC, | |
176 | [4] = GFS2_DIF_IMMUTABLE, | |
177 | [5] = GFS2_DIF_APPENDONLY, | |
178 | [7] = GFS2_DIF_NOATIME, | |
179 | [12] = GFS2_DIF_EXHASH, | |
b9af7ca6 SW |
180 | [14] = GFS2_DIF_INHERIT_JDATA, |
181 | [20] = GFS2_DIF_INHERIT_DIRECTIO, | |
71b86f56 SW |
182 | }; |
183 | ||
128e5eba SW |
184 | static const u32 gfs2_to_fsflags[32] = { |
185 | [gfs2fl_Sync] = FS_SYNC_FL, | |
186 | [gfs2fl_Immutable] = FS_IMMUTABLE_FL, | |
187 | [gfs2fl_AppendOnly] = FS_APPEND_FL, | |
188 | [gfs2fl_NoAtime] = FS_NOATIME_FL, | |
189 | [gfs2fl_ExHash] = FS_INDEX_FL, | |
128e5eba SW |
190 | [gfs2fl_InheritDirectio] = FS_DIRECTIO_FL, |
191 | [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, | |
7ea9ea83 | 192 | }; |
71b86f56 | 193 | |
b09e593d | 194 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 195 | { |
81454098 | 196 | struct inode *inode = filp->f_path.dentry->d_inode; |
feaa7bba | 197 | struct gfs2_inode *ip = GFS2_I(inode); |
71b86f56 SW |
198 | struct gfs2_holder gh; |
199 | int error; | |
128e5eba | 200 | u32 fsflags; |
71b86f56 SW |
201 | |
202 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); | |
dcd24799 | 203 | error = gfs2_glock_nq_atime(&gh); |
71b86f56 SW |
204 | if (error) |
205 | return error; | |
907b9bce | 206 | |
128e5eba | 207 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags); |
b9af7ca6 SW |
208 | if (!S_ISDIR(inode->i_mode)) { |
209 | if (ip->i_di.di_flags & GFS2_DIF_JDATA) | |
210 | fsflags |= FS_JOURNAL_DATA_FL; | |
211 | if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO) | |
212 | fsflags |= FS_DIRECTIO_FL; | |
213 | } | |
128e5eba | 214 | if (put_user(fsflags, ptr)) |
71b86f56 SW |
215 | error = -EFAULT; |
216 | ||
217 | gfs2_glock_dq_m(1, &gh); | |
218 | gfs2_holder_uninit(&gh); | |
219 | return error; | |
220 | } | |
221 | ||
6b124d8d SW |
222 | void gfs2_set_inode_flags(struct inode *inode) |
223 | { | |
224 | struct gfs2_inode *ip = GFS2_I(inode); | |
225 | struct gfs2_dinode_host *di = &ip->i_di; | |
226 | unsigned int flags = inode->i_flags; | |
227 | ||
228 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
229 | if (di->di_flags & GFS2_DIF_IMMUTABLE) | |
230 | flags |= S_IMMUTABLE; | |
231 | if (di->di_flags & GFS2_DIF_APPENDONLY) | |
232 | flags |= S_APPEND; | |
233 | if (di->di_flags & GFS2_DIF_NOATIME) | |
234 | flags |= S_NOATIME; | |
235 | if (di->di_flags & GFS2_DIF_SYNC) | |
236 | flags |= S_SYNC; | |
237 | inode->i_flags = flags; | |
238 | } | |
239 | ||
71b86f56 SW |
240 | /* Flags that can be set by user space */ |
241 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
242 | GFS2_DIF_DIRECTIO| \ | |
243 | GFS2_DIF_IMMUTABLE| \ | |
244 | GFS2_DIF_APPENDONLY| \ | |
245 | GFS2_DIF_NOATIME| \ | |
246 | GFS2_DIF_SYNC| \ | |
247 | GFS2_DIF_SYSTEM| \ | |
248 | GFS2_DIF_INHERIT_DIRECTIO| \ | |
249 | GFS2_DIF_INHERIT_JDATA) | |
250 | ||
251 | /** | |
252 | * gfs2_set_flags - set flags on an inode | |
253 | * @inode: The inode | |
254 | * @flags: The flags to set | |
255 | * @mask: Indicates which flags are valid | |
256 | * | |
257 | */ | |
b09e593d | 258 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
71b86f56 | 259 | { |
81454098 | 260 | struct inode *inode = filp->f_path.dentry->d_inode; |
feaa7bba SW |
261 | struct gfs2_inode *ip = GFS2_I(inode); |
262 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
71b86f56 SW |
263 | struct buffer_head *bh; |
264 | struct gfs2_holder gh; | |
265 | int error; | |
55eccc6d | 266 | u32 new_flags, flags; |
71b86f56 | 267 | |
71b86f56 | 268 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
52f341cf | 269 | if (error) |
71b86f56 SW |
270 | return error; |
271 | ||
55eccc6d SW |
272 | flags = ip->i_di.di_flags; |
273 | new_flags = (flags & ~mask) | (reqflags & mask); | |
71b86f56 SW |
274 | if ((new_flags ^ flags) == 0) |
275 | goto out; | |
276 | ||
277 | error = -EINVAL; | |
278 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) | |
279 | goto out; | |
280 | ||
71b86f56 SW |
281 | error = -EPERM; |
282 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
283 | goto out; | |
284 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
285 | goto out; | |
907b9bce | 286 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
b9cb9813 | 287 | !capable(CAP_LINUX_IMMUTABLE)) |
71b86f56 | 288 | goto out; |
b9cb9813 | 289 | if (!IS_IMMUTABLE(inode)) { |
faf450ef | 290 | error = permission(inode, MAY_WRITE, NULL); |
b9cb9813 SW |
291 | if (error) |
292 | goto out; | |
293 | } | |
71b86f56 | 294 | |
55eccc6d | 295 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
71b86f56 SW |
296 | if (error) |
297 | goto out; | |
55eccc6d SW |
298 | error = gfs2_meta_inode_buffer(ip, &bh); |
299 | if (error) | |
300 | goto out_trans_end; | |
71b86f56 SW |
301 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
302 | ip->i_di.di_flags = new_flags; | |
539e5d6b | 303 | gfs2_dinode_out(ip, bh->b_data); |
71b86f56 | 304 | brelse(bh); |
6b124d8d | 305 | gfs2_set_inode_flags(inode); |
55eccc6d SW |
306 | out_trans_end: |
307 | gfs2_trans_end(sdp); | |
71b86f56 SW |
308 | out: |
309 | gfs2_glock_dq_uninit(&gh); | |
310 | return error; | |
311 | } | |
312 | ||
b09e593d | 313 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 314 | { |
b9af7ca6 | 315 | struct inode *inode = filp->f_path.dentry->d_inode; |
128e5eba SW |
316 | u32 fsflags, gfsflags; |
317 | if (get_user(fsflags, ptr)) | |
71b86f56 | 318 | return -EFAULT; |
128e5eba | 319 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); |
b9af7ca6 SW |
320 | if (!S_ISDIR(inode->i_mode)) { |
321 | if (gfsflags & GFS2_DIF_INHERIT_JDATA) | |
322 | gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); | |
323 | if (gfsflags & GFS2_DIF_INHERIT_DIRECTIO) | |
324 | gfsflags ^= (GFS2_DIF_DIRECTIO | GFS2_DIF_INHERIT_DIRECTIO); | |
325 | return do_gfs2_set_flags(filp, gfsflags, ~0); | |
326 | } | |
327 | return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); | |
71b86f56 SW |
328 | } |
329 | ||
b09e593d | 330 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
71b86f56 SW |
331 | { |
332 | switch(cmd) { | |
128e5eba | 333 | case FS_IOC_GETFLAGS: |
b09e593d | 334 | return gfs2_get_flags(filp, (u32 __user *)arg); |
128e5eba | 335 | case FS_IOC_SETFLAGS: |
b09e593d | 336 | return gfs2_set_flags(filp, (u32 __user *)arg); |
71b86f56 SW |
337 | } |
338 | return -ENOTTY; | |
339 | } | |
340 | ||
341 | ||
b3b94faa DT |
342 | /** |
343 | * gfs2_mmap - | |
344 | * @file: The file to map | |
345 | * @vma: The VMA which described the mapping | |
346 | * | |
347 | * Returns: 0 or error code | |
348 | */ | |
349 | ||
350 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
351 | { | |
feaa7bba | 352 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
353 | struct gfs2_holder i_gh; |
354 | int error; | |
355 | ||
b3b94faa DT |
356 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); |
357 | error = gfs2_glock_nq_atime(&i_gh); | |
358 | if (error) { | |
359 | gfs2_holder_uninit(&i_gh); | |
360 | return error; | |
361 | } | |
362 | ||
18ec7d5c SW |
363 | /* This is VM_MAYWRITE instead of VM_WRITE because a call |
364 | to mprotect() can turn on VM_WRITE later. */ | |
365 | ||
366 | if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) == | |
367 | (VM_MAYSHARE | VM_MAYWRITE)) | |
368 | vma->vm_ops = &gfs2_vm_ops_sharewrite; | |
369 | else | |
370 | vma->vm_ops = &gfs2_vm_ops_private; | |
b3b94faa DT |
371 | |
372 | gfs2_glock_dq_uninit(&i_gh); | |
373 | ||
374 | return error; | |
375 | } | |
376 | ||
377 | /** | |
378 | * gfs2_open - open a file | |
379 | * @inode: the inode to open | |
380 | * @file: the struct file for this opening | |
381 | * | |
382 | * Returns: errno | |
383 | */ | |
384 | ||
385 | static int gfs2_open(struct inode *inode, struct file *file) | |
386 | { | |
feaa7bba | 387 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
388 | struct gfs2_holder i_gh; |
389 | struct gfs2_file *fp; | |
390 | int error; | |
391 | ||
b3b94faa DT |
392 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
393 | if (!fp) | |
394 | return -ENOMEM; | |
395 | ||
f55ab26a | 396 | mutex_init(&fp->f_fl_mutex); |
b3b94faa | 397 | |
feaa7bba | 398 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
5c676f6d | 399 | file->private_data = fp; |
b3b94faa | 400 | |
b60623c2 | 401 | if (S_ISREG(ip->i_inode.i_mode)) { |
b3b94faa DT |
402 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
403 | &i_gh); | |
404 | if (error) | |
405 | goto fail; | |
406 | ||
407 | if (!(file->f_flags & O_LARGEFILE) && | |
408 | ip->i_di.di_size > MAX_NON_LFS) { | |
409 | error = -EFBIG; | |
410 | goto fail_gunlock; | |
411 | } | |
412 | ||
413 | /* Listen to the Direct I/O flag */ | |
414 | ||
415 | if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO) | |
416 | file->f_flags |= O_DIRECT; | |
417 | ||
b3b94faa DT |
418 | gfs2_glock_dq_uninit(&i_gh); |
419 | } | |
420 | ||
421 | return 0; | |
422 | ||
420b9e5e | 423 | fail_gunlock: |
b3b94faa | 424 | gfs2_glock_dq_uninit(&i_gh); |
420b9e5e | 425 | fail: |
5c676f6d | 426 | file->private_data = NULL; |
b3b94faa | 427 | kfree(fp); |
b3b94faa DT |
428 | return error; |
429 | } | |
430 | ||
431 | /** | |
432 | * gfs2_close - called to close a struct file | |
433 | * @inode: the inode the struct file belongs to | |
434 | * @file: the struct file being closed | |
435 | * | |
436 | * Returns: errno | |
437 | */ | |
438 | ||
439 | static int gfs2_close(struct inode *inode, struct file *file) | |
440 | { | |
5c676f6d | 441 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
b3b94faa DT |
442 | struct gfs2_file *fp; |
443 | ||
5c676f6d SW |
444 | fp = file->private_data; |
445 | file->private_data = NULL; | |
b3b94faa DT |
446 | |
447 | if (gfs2_assert_warn(sdp, fp)) | |
448 | return -EIO; | |
449 | ||
450 | kfree(fp); | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | /** | |
456 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
457 | * @file: the file that points to the dentry (we ignore this) | |
458 | * @dentry: the dentry that points to the inode to sync | |
459 | * | |
33c3de32 SW |
460 | * The VFS will flush "normal" data for us. We only need to worry |
461 | * about metadata here. For journaled data, we just do a log flush | |
462 | * as we can't avoid it. Otherwise we can just bale out if datasync | |
463 | * is set. For stuffed inodes we must flush the log in order to | |
464 | * ensure that all data is on disk. | |
465 | * | |
34126f9f SW |
466 | * The call to write_inode_now() is there to write back metadata and |
467 | * the inode itself. It does also try and write the data, but thats | |
468 | * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite() | |
469 | * for us. | |
470 | * | |
b3b94faa DT |
471 | * Returns: errno |
472 | */ | |
473 | ||
474 | static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync) | |
475 | { | |
33c3de32 SW |
476 | struct inode *inode = dentry->d_inode; |
477 | int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); | |
478 | int ret = 0; | |
33c3de32 SW |
479 | |
480 | if (gfs2_is_jdata(GFS2_I(inode))) { | |
481 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); | |
482 | return 0; | |
483 | } | |
b3b94faa | 484 | |
33c3de32 SW |
485 | if (sync_state != 0) { |
486 | if (!datasync) | |
34126f9f | 487 | ret = write_inode_now(inode, 0); |
b3b94faa | 488 | |
33c3de32 SW |
489 | if (gfs2_is_stuffed(GFS2_I(inode))) |
490 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); | |
491 | } | |
492 | ||
493 | return ret; | |
b3b94faa DT |
494 | } |
495 | ||
60446067 ME |
496 | /** |
497 | * gfs2_setlease - acquire/release a file lease | |
498 | * @file: the file pointer | |
499 | * @arg: lease type | |
500 | * @fl: file lock | |
501 | * | |
502 | * Returns: errno | |
503 | */ | |
504 | ||
505 | static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) | |
506 | { | |
507 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
508 | ||
509 | /* | |
510 | * We don't currently have a way to enforce a lease across the whole | |
511 | * cluster; until we do, disable leases (by just returning -EINVAL), | |
512 | * unless the administrator has requested purely local locking. | |
513 | */ | |
514 | if (!sdp->sd_args.ar_localflocks) | |
515 | return -EINVAL; | |
0af1a450 | 516 | return generic_setlease(file, arg, fl); |
60446067 ME |
517 | } |
518 | ||
b3b94faa DT |
519 | /** |
520 | * gfs2_lock - acquire/release a posix lock on a file | |
521 | * @file: the file pointer | |
522 | * @cmd: either modify or retrieve lock state, possibly wait | |
523 | * @fl: type and range of lock | |
524 | * | |
525 | * Returns: errno | |
526 | */ | |
527 | ||
528 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
529 | { | |
feaa7bba SW |
530 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
531 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
b3b94faa | 532 | struct lm_lockname name = |
dbb7cae2 | 533 | { .ln_number = ip->i_no_addr, |
b3b94faa DT |
534 | .ln_type = LM_TYPE_PLOCK }; |
535 | ||
b3b94faa DT |
536 | if (!(fl->fl_flags & FL_POSIX)) |
537 | return -ENOLCK; | |
b60623c2 | 538 | if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) |
b3b94faa DT |
539 | return -ENOLCK; |
540 | ||
541 | if (sdp->sd_args.ar_localflocks) { | |
542 | if (IS_GETLK(cmd)) { | |
9d6a8c5c | 543 | posix_test_lock(file, fl); |
b3b94faa DT |
544 | return 0; |
545 | } else { | |
8628de05 | 546 | return posix_lock_file_wait(file, fl); |
b3b94faa DT |
547 | } |
548 | } | |
549 | ||
586759f0 ME |
550 | if (cmd == F_CANCELLK) { |
551 | /* Hack: */ | |
552 | cmd = F_SETLK; | |
553 | fl->fl_type = F_UNLCK; | |
554 | } | |
b3b94faa DT |
555 | if (IS_GETLK(cmd)) |
556 | return gfs2_lm_plock_get(sdp, &name, file, fl); | |
557 | else if (fl->fl_type == F_UNLCK) | |
558 | return gfs2_lm_punlock(sdp, &name, file, fl); | |
559 | else | |
560 | return gfs2_lm_plock(sdp, &name, file, cmd, fl); | |
561 | } | |
562 | ||
b3b94faa DT |
563 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
564 | { | |
5c676f6d | 565 | struct gfs2_file *fp = file->private_data; |
b3b94faa | 566 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
81454098 | 567 | struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); |
b3b94faa DT |
568 | struct gfs2_glock *gl; |
569 | unsigned int state; | |
570 | int flags; | |
571 | int error = 0; | |
572 | ||
573 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
26c1a574 | 574 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; |
b3b94faa | 575 | |
f55ab26a | 576 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
577 | |
578 | gl = fl_gh->gh_gl; | |
579 | if (gl) { | |
580 | if (fl_gh->gh_state == state) | |
581 | goto out; | |
582 | gfs2_glock_hold(gl); | |
583 | flock_lock_file_wait(file, | |
907b9bce | 584 | &(struct file_lock){.fl_type = F_UNLCK}); |
b3b94faa DT |
585 | gfs2_glock_dq_uninit(fl_gh); |
586 | } else { | |
feaa7bba | 587 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), |
dbb7cae2 | 588 | ip->i_no_addr, &gfs2_flock_glops, |
b3b94faa DT |
589 | CREATE, &gl); |
590 | if (error) | |
591 | goto out; | |
592 | } | |
593 | ||
594 | gfs2_holder_init(gl, state, flags, fl_gh); | |
595 | gfs2_glock_put(gl); | |
596 | ||
597 | error = gfs2_glock_nq(fl_gh); | |
598 | if (error) { | |
599 | gfs2_holder_uninit(fl_gh); | |
600 | if (error == GLR_TRYFAILED) | |
601 | error = -EAGAIN; | |
602 | } else { | |
603 | error = flock_lock_file_wait(file, fl); | |
feaa7bba | 604 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
b3b94faa DT |
605 | } |
606 | ||
420b9e5e | 607 | out: |
f55ab26a | 608 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
609 | return error; |
610 | } | |
611 | ||
612 | static void do_unflock(struct file *file, struct file_lock *fl) | |
613 | { | |
5c676f6d | 614 | struct gfs2_file *fp = file->private_data; |
b3b94faa DT |
615 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
616 | ||
f55ab26a | 617 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
618 | flock_lock_file_wait(file, fl); |
619 | if (fl_gh->gh_gl) | |
620 | gfs2_glock_dq_uninit(fl_gh); | |
f55ab26a | 621 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
622 | } |
623 | ||
624 | /** | |
625 | * gfs2_flock - acquire/release a flock lock on a file | |
626 | * @file: the file pointer | |
627 | * @cmd: either modify or retrieve lock state, possibly wait | |
628 | * @fl: type and range of lock | |
629 | * | |
630 | * Returns: errno | |
631 | */ | |
632 | ||
633 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
634 | { | |
feaa7bba SW |
635 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
636 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
b3b94faa | 637 | |
b3b94faa DT |
638 | if (!(fl->fl_flags & FL_FLOCK)) |
639 | return -ENOLCK; | |
b60623c2 | 640 | if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) |
b3b94faa DT |
641 | return -ENOLCK; |
642 | ||
643 | if (sdp->sd_args.ar_localflocks) | |
644 | return flock_lock_file_wait(file, fl); | |
645 | ||
646 | if (fl->fl_type == F_UNLCK) { | |
647 | do_unflock(file, fl); | |
648 | return 0; | |
d00223f1 | 649 | } else { |
b3b94faa | 650 | return do_flock(file, cmd, fl); |
d00223f1 | 651 | } |
b3b94faa DT |
652 | } |
653 | ||
b0dd9308 | 654 | const struct file_operations gfs2_file_fops = { |
26c1a574 | 655 | .llseek = gfs2_llseek, |
d00223f1 | 656 | .read = do_sync_read, |
26c1a574 | 657 | .aio_read = generic_file_aio_read, |
d00223f1 | 658 | .write = do_sync_write, |
26c1a574 SW |
659 | .aio_write = generic_file_aio_write, |
660 | .unlocked_ioctl = gfs2_ioctl, | |
661 | .mmap = gfs2_mmap, | |
662 | .open = gfs2_open, | |
663 | .release = gfs2_close, | |
664 | .fsync = gfs2_fsync, | |
665 | .lock = gfs2_lock, | |
26c1a574 SW |
666 | .flock = gfs2_flock, |
667 | .splice_read = generic_file_splice_read, | |
668 | .splice_write = generic_file_splice_write, | |
60446067 | 669 | .setlease = gfs2_setlease, |
b3b94faa DT |
670 | }; |
671 | ||
b0dd9308 | 672 | const struct file_operations gfs2_dir_fops = { |
26c1a574 SW |
673 | .readdir = gfs2_readdir, |
674 | .unlocked_ioctl = gfs2_ioctl, | |
675 | .open = gfs2_open, | |
676 | .release = gfs2_close, | |
677 | .fsync = gfs2_fsync, | |
678 | .lock = gfs2_lock, | |
679 | .flock = gfs2_flock, | |
b3b94faa DT |
680 | }; |
681 |