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> | |
f58ba889 | 18 | #include <linux/mount.h> |
18ec7d5c | 19 | #include <linux/fs.h> |
5c676f6d | 20 | #include <linux/gfs2_ondisk.h> |
71b86f56 SW |
21 | #include <linux/ext2_fs.h> |
22 | #include <linux/crc32.h> | |
7d308590 | 23 | #include <linux/lm_interface.h> |
33c3de32 | 24 | #include <linux/writeback.h> |
b3b94faa DT |
25 | #include <asm/uaccess.h> |
26 | ||
27 | #include "gfs2.h" | |
5c676f6d | 28 | #include "incore.h" |
b3b94faa DT |
29 | #include "bmap.h" |
30 | #include "dir.h" | |
31 | #include "glock.h" | |
32 | #include "glops.h" | |
33 | #include "inode.h" | |
b3b94faa DT |
34 | #include "log.h" |
35 | #include "meta_io.h" | |
b3b94faa DT |
36 | #include "quota.h" |
37 | #include "rgrp.h" | |
38 | #include "trans.h" | |
5c676f6d | 39 | #include "util.h" |
71b86f56 | 40 | #include "eaops.h" |
5561093e | 41 | #include "ops_address.h" |
8af4c72f | 42 | #include "ops_inode.h" |
b3b94faa | 43 | |
b3b94faa DT |
44 | /** |
45 | * gfs2_llseek - seek to a location in a file | |
46 | * @file: the file | |
47 | * @offset: the offset | |
48 | * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) | |
49 | * | |
50 | * SEEK_END requires the glock for the file because it references the | |
51 | * file's size. | |
52 | * | |
53 | * Returns: The new offset, or errno | |
54 | */ | |
55 | ||
56 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) | |
57 | { | |
feaa7bba | 58 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
59 | struct gfs2_holder i_gh; |
60 | loff_t error; | |
61 | ||
b3b94faa DT |
62 | if (origin == 2) { |
63 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, | |
64 | &i_gh); | |
65 | if (!error) { | |
9465efc9 | 66 | error = generic_file_llseek_unlocked(file, offset, origin); |
b3b94faa DT |
67 | gfs2_glock_dq_uninit(&i_gh); |
68 | } | |
69 | } else | |
9465efc9 | 70 | error = generic_file_llseek_unlocked(file, offset, origin); |
b3b94faa DT |
71 | |
72 | return error; | |
73 | } | |
74 | ||
b3b94faa | 75 | /** |
f0e522a9 | 76 | * gfs2_readdir - Read directory entries from a directory |
b3b94faa DT |
77 | * @file: The directory to read from |
78 | * @dirent: Buffer for dirents | |
79 | * @filldir: Function used to do the copying | |
80 | * | |
81 | * Returns: errno | |
82 | */ | |
83 | ||
f0e522a9 | 84 | static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) |
b3b94faa | 85 | { |
71b86f56 | 86 | struct inode *dir = file->f_mapping->host; |
feaa7bba | 87 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 88 | struct gfs2_holder d_gh; |
cd915493 | 89 | u64 offset = file->f_pos; |
b3b94faa DT |
90 | int error; |
91 | ||
719ee344 SW |
92 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
93 | error = gfs2_glock_nq(&d_gh); | |
b3b94faa DT |
94 | if (error) { |
95 | gfs2_holder_uninit(&d_gh); | |
96 | return error; | |
97 | } | |
98 | ||
3699e3a4 | 99 | error = gfs2_dir_read(dir, &offset, dirent, filldir); |
b3b94faa DT |
100 | |
101 | gfs2_glock_dq_uninit(&d_gh); | |
102 | ||
b3b94faa DT |
103 | file->f_pos = offset; |
104 | ||
b3b94faa DT |
105 | return error; |
106 | } | |
107 | ||
128e5eba SW |
108 | /** |
109 | * fsflags_cvt | |
110 | * @table: A table of 32 u32 flags | |
111 | * @val: a 32 bit value to convert | |
112 | * | |
113 | * This function can be used to convert between fsflags values and | |
114 | * GFS2's own flags values. | |
115 | * | |
116 | * Returns: the converted flags | |
117 | */ | |
118 | static u32 fsflags_cvt(const u32 *table, u32 val) | |
119 | { | |
120 | u32 res = 0; | |
121 | while(val) { | |
122 | if (val & 1) | |
123 | res |= *table; | |
124 | table++; | |
125 | val >>= 1; | |
126 | } | |
127 | return res; | |
128 | } | |
b3b94faa | 129 | |
128e5eba SW |
130 | static const u32 fsflags_to_gfs2[32] = { |
131 | [3] = GFS2_DIF_SYNC, | |
132 | [4] = GFS2_DIF_IMMUTABLE, | |
133 | [5] = GFS2_DIF_APPENDONLY, | |
134 | [7] = GFS2_DIF_NOATIME, | |
135 | [12] = GFS2_DIF_EXHASH, | |
b9af7ca6 | 136 | [14] = GFS2_DIF_INHERIT_JDATA, |
71b86f56 SW |
137 | }; |
138 | ||
128e5eba SW |
139 | static const u32 gfs2_to_fsflags[32] = { |
140 | [gfs2fl_Sync] = FS_SYNC_FL, | |
141 | [gfs2fl_Immutable] = FS_IMMUTABLE_FL, | |
142 | [gfs2fl_AppendOnly] = FS_APPEND_FL, | |
143 | [gfs2fl_NoAtime] = FS_NOATIME_FL, | |
144 | [gfs2fl_ExHash] = FS_INDEX_FL, | |
128e5eba | 145 | [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, |
7ea9ea83 | 146 | }; |
71b86f56 | 147 | |
b09e593d | 148 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 149 | { |
81454098 | 150 | struct inode *inode = filp->f_path.dentry->d_inode; |
feaa7bba | 151 | struct gfs2_inode *ip = GFS2_I(inode); |
71b86f56 SW |
152 | struct gfs2_holder gh; |
153 | int error; | |
128e5eba | 154 | u32 fsflags; |
71b86f56 | 155 | |
719ee344 SW |
156 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
157 | error = gfs2_glock_nq(&gh); | |
71b86f56 SW |
158 | if (error) |
159 | return error; | |
907b9bce | 160 | |
128e5eba | 161 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags); |
c9f6a6bb SW |
162 | if (!S_ISDIR(inode->i_mode) && ip->i_di.di_flags & GFS2_DIF_JDATA) |
163 | fsflags |= FS_JOURNAL_DATA_FL; | |
128e5eba | 164 | if (put_user(fsflags, ptr)) |
71b86f56 SW |
165 | error = -EFAULT; |
166 | ||
3cc3f710 | 167 | gfs2_glock_dq(&gh); |
71b86f56 SW |
168 | gfs2_holder_uninit(&gh); |
169 | return error; | |
170 | } | |
171 | ||
6b124d8d SW |
172 | void gfs2_set_inode_flags(struct inode *inode) |
173 | { | |
174 | struct gfs2_inode *ip = GFS2_I(inode); | |
175 | struct gfs2_dinode_host *di = &ip->i_di; | |
176 | unsigned int flags = inode->i_flags; | |
177 | ||
178 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
179 | if (di->di_flags & GFS2_DIF_IMMUTABLE) | |
180 | flags |= S_IMMUTABLE; | |
181 | if (di->di_flags & GFS2_DIF_APPENDONLY) | |
182 | flags |= S_APPEND; | |
183 | if (di->di_flags & GFS2_DIF_NOATIME) | |
184 | flags |= S_NOATIME; | |
185 | if (di->di_flags & GFS2_DIF_SYNC) | |
186 | flags |= S_SYNC; | |
187 | inode->i_flags = flags; | |
188 | } | |
189 | ||
71b86f56 SW |
190 | /* Flags that can be set by user space */ |
191 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
71b86f56 SW |
192 | GFS2_DIF_IMMUTABLE| \ |
193 | GFS2_DIF_APPENDONLY| \ | |
194 | GFS2_DIF_NOATIME| \ | |
195 | GFS2_DIF_SYNC| \ | |
196 | GFS2_DIF_SYSTEM| \ | |
71b86f56 SW |
197 | GFS2_DIF_INHERIT_JDATA) |
198 | ||
199 | /** | |
200 | * gfs2_set_flags - set flags on an inode | |
201 | * @inode: The inode | |
202 | * @flags: The flags to set | |
203 | * @mask: Indicates which flags are valid | |
204 | * | |
205 | */ | |
b09e593d | 206 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
71b86f56 | 207 | { |
81454098 | 208 | struct inode *inode = filp->f_path.dentry->d_inode; |
feaa7bba SW |
209 | struct gfs2_inode *ip = GFS2_I(inode); |
210 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
71b86f56 SW |
211 | struct buffer_head *bh; |
212 | struct gfs2_holder gh; | |
213 | int error; | |
55eccc6d | 214 | u32 new_flags, flags; |
71b86f56 | 215 | |
f58ba889 | 216 | error = mnt_want_write(filp->f_path.mnt); |
52f341cf | 217 | if (error) |
71b86f56 SW |
218 | return error; |
219 | ||
f58ba889 MS |
220 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
221 | if (error) | |
222 | goto out_drop_write; | |
223 | ||
55eccc6d SW |
224 | flags = ip->i_di.di_flags; |
225 | new_flags = (flags & ~mask) | (reqflags & mask); | |
71b86f56 SW |
226 | if ((new_flags ^ flags) == 0) |
227 | goto out; | |
228 | ||
229 | error = -EINVAL; | |
230 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) | |
231 | goto out; | |
232 | ||
71b86f56 SW |
233 | error = -EPERM; |
234 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
235 | goto out; | |
236 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
237 | goto out; | |
907b9bce | 238 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
b9cb9813 | 239 | !capable(CAP_LINUX_IMMUTABLE)) |
71b86f56 | 240 | goto out; |
b9cb9813 | 241 | if (!IS_IMMUTABLE(inode)) { |
f58ba889 | 242 | error = gfs2_permission(inode, MAY_WRITE); |
b9cb9813 SW |
243 | if (error) |
244 | goto out; | |
245 | } | |
5561093e SW |
246 | if ((flags ^ new_flags) & GFS2_DIF_JDATA) { |
247 | if (flags & GFS2_DIF_JDATA) | |
248 | gfs2_log_flush(sdp, ip->i_gl); | |
249 | error = filemap_fdatawrite(inode->i_mapping); | |
250 | if (error) | |
251 | goto out; | |
252 | error = filemap_fdatawait(inode->i_mapping); | |
253 | if (error) | |
254 | goto out; | |
255 | } | |
55eccc6d | 256 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
71b86f56 SW |
257 | if (error) |
258 | goto out; | |
55eccc6d SW |
259 | error = gfs2_meta_inode_buffer(ip, &bh); |
260 | if (error) | |
261 | goto out_trans_end; | |
71b86f56 SW |
262 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
263 | ip->i_di.di_flags = new_flags; | |
539e5d6b | 264 | gfs2_dinode_out(ip, bh->b_data); |
71b86f56 | 265 | brelse(bh); |
6b124d8d | 266 | gfs2_set_inode_flags(inode); |
5561093e | 267 | gfs2_set_aops(inode); |
55eccc6d SW |
268 | out_trans_end: |
269 | gfs2_trans_end(sdp); | |
71b86f56 SW |
270 | out: |
271 | gfs2_glock_dq_uninit(&gh); | |
f58ba889 MS |
272 | out_drop_write: |
273 | mnt_drop_write(filp->f_path.mnt); | |
71b86f56 SW |
274 | return error; |
275 | } | |
276 | ||
b09e593d | 277 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 278 | { |
b9af7ca6 | 279 | struct inode *inode = filp->f_path.dentry->d_inode; |
128e5eba SW |
280 | u32 fsflags, gfsflags; |
281 | if (get_user(fsflags, ptr)) | |
71b86f56 | 282 | return -EFAULT; |
128e5eba | 283 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); |
b9af7ca6 SW |
284 | if (!S_ISDIR(inode->i_mode)) { |
285 | if (gfsflags & GFS2_DIF_INHERIT_JDATA) | |
286 | gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); | |
b9af7ca6 SW |
287 | return do_gfs2_set_flags(filp, gfsflags, ~0); |
288 | } | |
289 | return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); | |
71b86f56 SW |
290 | } |
291 | ||
b09e593d | 292 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
71b86f56 SW |
293 | { |
294 | switch(cmd) { | |
128e5eba | 295 | case FS_IOC_GETFLAGS: |
b09e593d | 296 | return gfs2_get_flags(filp, (u32 __user *)arg); |
128e5eba | 297 | case FS_IOC_SETFLAGS: |
b09e593d | 298 | return gfs2_set_flags(filp, (u32 __user *)arg); |
71b86f56 SW |
299 | } |
300 | return -ENOTTY; | |
301 | } | |
302 | ||
3cc3f710 SW |
303 | /** |
304 | * gfs2_allocate_page_backing - Use bmap to allocate blocks | |
305 | * @page: The (locked) page to allocate backing for | |
306 | * | |
307 | * We try to allocate all the blocks required for the page in | |
308 | * one go. This might fail for various reasons, so we keep | |
309 | * trying until all the blocks to back this page are allocated. | |
310 | * If some of the blocks are already allocated, thats ok too. | |
311 | */ | |
312 | ||
313 | static int gfs2_allocate_page_backing(struct page *page) | |
314 | { | |
315 | struct inode *inode = page->mapping->host; | |
316 | struct buffer_head bh; | |
317 | unsigned long size = PAGE_CACHE_SIZE; | |
318 | u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
319 | ||
320 | do { | |
321 | bh.b_state = 0; | |
322 | bh.b_size = size; | |
e9e1ef2b | 323 | gfs2_block_map(inode, lblock, &bh, 1); |
3cc3f710 SW |
324 | if (!buffer_mapped(&bh)) |
325 | return -EIO; | |
326 | size -= bh.b_size; | |
327 | lblock += (bh.b_size >> inode->i_blkbits); | |
328 | } while(size > 0); | |
329 | return 0; | |
330 | } | |
331 | ||
332 | /** | |
333 | * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable | |
334 | * @vma: The virtual memory area | |
335 | * @page: The page which is about to become writable | |
336 | * | |
337 | * When the page becomes writable, we need to ensure that we have | |
338 | * blocks allocated on disk to back that page. | |
339 | */ | |
340 | ||
341 | static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
342 | { | |
343 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
344 | struct gfs2_inode *ip = GFS2_I(inode); | |
345 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
346 | unsigned long last_index; | |
347 | u64 pos = page->index << (PAGE_CACHE_SIZE - inode->i_blkbits); | |
348 | unsigned int data_blocks, ind_blocks, rblocks; | |
349 | int alloc_required = 0; | |
350 | struct gfs2_holder gh; | |
351 | struct gfs2_alloc *al; | |
352 | int ret; | |
353 | ||
719ee344 SW |
354 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
355 | ret = gfs2_glock_nq(&gh); | |
3cc3f710 SW |
356 | if (ret) |
357 | goto out; | |
358 | ||
359 | set_bit(GIF_SW_PAGED, &ip->i_flags); | |
360 | gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); | |
361 | ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required); | |
362 | if (ret || !alloc_required) | |
363 | goto out_unlock; | |
6dbd8224 | 364 | ret = -ENOMEM; |
3cc3f710 | 365 | al = gfs2_alloc_get(ip); |
6dbd8224 SW |
366 | if (al == NULL) |
367 | goto out_unlock; | |
368 | ||
d82661d9 | 369 | ret = gfs2_quota_lock_check(ip); |
3cc3f710 SW |
370 | if (ret) |
371 | goto out_alloc_put; | |
3cc3f710 SW |
372 | al->al_requested = data_blocks + ind_blocks; |
373 | ret = gfs2_inplace_reserve(ip); | |
374 | if (ret) | |
375 | goto out_quota_unlock; | |
376 | ||
377 | rblocks = RES_DINODE + ind_blocks; | |
378 | if (gfs2_is_jdata(ip)) | |
379 | rblocks += data_blocks ? data_blocks : 1; | |
380 | if (ind_blocks || data_blocks) | |
381 | rblocks += RES_STATFS + RES_QUOTA; | |
382 | ret = gfs2_trans_begin(sdp, rblocks, 0); | |
383 | if (ret) | |
384 | goto out_trans_fail; | |
385 | ||
386 | lock_page(page); | |
387 | ret = -EINVAL; | |
388 | last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT; | |
389 | if (page->index > last_index) | |
390 | goto out_unlock_page; | |
b7fe2e39 | 391 | ret = 0; |
3cc3f710 SW |
392 | if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping) |
393 | goto out_unlock_page; | |
394 | if (gfs2_is_stuffed(ip)) { | |
395 | ret = gfs2_unstuff_dinode(ip, page); | |
396 | if (ret) | |
397 | goto out_unlock_page; | |
398 | } | |
399 | ret = gfs2_allocate_page_backing(page); | |
400 | ||
401 | out_unlock_page: | |
402 | unlock_page(page); | |
403 | gfs2_trans_end(sdp); | |
404 | out_trans_fail: | |
405 | gfs2_inplace_release(ip); | |
406 | out_quota_unlock: | |
407 | gfs2_quota_unlock(ip); | |
408 | out_alloc_put: | |
409 | gfs2_alloc_put(ip); | |
410 | out_unlock: | |
411 | gfs2_glock_dq(&gh); | |
412 | out: | |
413 | gfs2_holder_uninit(&gh); | |
414 | return ret; | |
415 | } | |
416 | ||
417 | static struct vm_operations_struct gfs2_vm_ops = { | |
418 | .fault = filemap_fault, | |
419 | .page_mkwrite = gfs2_page_mkwrite, | |
420 | }; | |
421 | ||
71b86f56 | 422 | |
b3b94faa DT |
423 | /** |
424 | * gfs2_mmap - | |
425 | * @file: The file to map | |
426 | * @vma: The VMA which described the mapping | |
427 | * | |
428 | * Returns: 0 or error code | |
429 | */ | |
430 | ||
431 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
432 | { | |
feaa7bba | 433 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
434 | struct gfs2_holder i_gh; |
435 | int error; | |
436 | ||
719ee344 SW |
437 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); |
438 | error = gfs2_glock_nq(&i_gh); | |
b3b94faa DT |
439 | if (error) { |
440 | gfs2_holder_uninit(&i_gh); | |
441 | return error; | |
442 | } | |
443 | ||
3cc3f710 | 444 | vma->vm_ops = &gfs2_vm_ops; |
b3b94faa DT |
445 | |
446 | gfs2_glock_dq_uninit(&i_gh); | |
447 | ||
448 | return error; | |
449 | } | |
450 | ||
451 | /** | |
452 | * gfs2_open - open a file | |
453 | * @inode: the inode to open | |
454 | * @file: the struct file for this opening | |
455 | * | |
456 | * Returns: errno | |
457 | */ | |
458 | ||
459 | static int gfs2_open(struct inode *inode, struct file *file) | |
460 | { | |
feaa7bba | 461 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
462 | struct gfs2_holder i_gh; |
463 | struct gfs2_file *fp; | |
464 | int error; | |
465 | ||
b3b94faa DT |
466 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
467 | if (!fp) | |
468 | return -ENOMEM; | |
469 | ||
f55ab26a | 470 | mutex_init(&fp->f_fl_mutex); |
b3b94faa | 471 | |
feaa7bba | 472 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
5c676f6d | 473 | file->private_data = fp; |
b3b94faa | 474 | |
b60623c2 | 475 | if (S_ISREG(ip->i_inode.i_mode)) { |
b3b94faa DT |
476 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
477 | &i_gh); | |
478 | if (error) | |
479 | goto fail; | |
480 | ||
481 | if (!(file->f_flags & O_LARGEFILE) && | |
482 | ip->i_di.di_size > MAX_NON_LFS) { | |
a9c62a18 | 483 | error = -EOVERFLOW; |
b3b94faa DT |
484 | goto fail_gunlock; |
485 | } | |
486 | ||
b3b94faa DT |
487 | gfs2_glock_dq_uninit(&i_gh); |
488 | } | |
489 | ||
490 | return 0; | |
491 | ||
420b9e5e | 492 | fail_gunlock: |
b3b94faa | 493 | gfs2_glock_dq_uninit(&i_gh); |
420b9e5e | 494 | fail: |
5c676f6d | 495 | file->private_data = NULL; |
b3b94faa | 496 | kfree(fp); |
b3b94faa DT |
497 | return error; |
498 | } | |
499 | ||
500 | /** | |
501 | * gfs2_close - called to close a struct file | |
502 | * @inode: the inode the struct file belongs to | |
503 | * @file: the struct file being closed | |
504 | * | |
505 | * Returns: errno | |
506 | */ | |
507 | ||
508 | static int gfs2_close(struct inode *inode, struct file *file) | |
509 | { | |
5c676f6d | 510 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
b3b94faa DT |
511 | struct gfs2_file *fp; |
512 | ||
5c676f6d SW |
513 | fp = file->private_data; |
514 | file->private_data = NULL; | |
b3b94faa DT |
515 | |
516 | if (gfs2_assert_warn(sdp, fp)) | |
517 | return -EIO; | |
518 | ||
519 | kfree(fp); | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
524 | /** | |
525 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
526 | * @file: the file that points to the dentry (we ignore this) | |
527 | * @dentry: the dentry that points to the inode to sync | |
528 | * | |
33c3de32 SW |
529 | * The VFS will flush "normal" data for us. We only need to worry |
530 | * about metadata here. For journaled data, we just do a log flush | |
531 | * as we can't avoid it. Otherwise we can just bale out if datasync | |
532 | * is set. For stuffed inodes we must flush the log in order to | |
533 | * ensure that all data is on disk. | |
534 | * | |
34126f9f SW |
535 | * The call to write_inode_now() is there to write back metadata and |
536 | * the inode itself. It does also try and write the data, but thats | |
537 | * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite() | |
538 | * for us. | |
539 | * | |
b3b94faa DT |
540 | * Returns: errno |
541 | */ | |
542 | ||
543 | static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync) | |
544 | { | |
33c3de32 SW |
545 | struct inode *inode = dentry->d_inode; |
546 | int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); | |
547 | int ret = 0; | |
33c3de32 SW |
548 | |
549 | if (gfs2_is_jdata(GFS2_I(inode))) { | |
550 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); | |
551 | return 0; | |
552 | } | |
b3b94faa | 553 | |
33c3de32 SW |
554 | if (sync_state != 0) { |
555 | if (!datasync) | |
34126f9f | 556 | ret = write_inode_now(inode, 0); |
b3b94faa | 557 | |
33c3de32 SW |
558 | if (gfs2_is_stuffed(GFS2_I(inode))) |
559 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); | |
560 | } | |
561 | ||
562 | return ret; | |
b3b94faa DT |
563 | } |
564 | ||
60446067 ME |
565 | /** |
566 | * gfs2_setlease - acquire/release a file lease | |
567 | * @file: the file pointer | |
568 | * @arg: lease type | |
569 | * @fl: file lock | |
570 | * | |
571 | * Returns: errno | |
572 | */ | |
573 | ||
574 | static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) | |
575 | { | |
576 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
577 | ||
578 | /* | |
579 | * We don't currently have a way to enforce a lease across the whole | |
580 | * cluster; until we do, disable leases (by just returning -EINVAL), | |
581 | * unless the administrator has requested purely local locking. | |
582 | */ | |
583 | if (!sdp->sd_args.ar_localflocks) | |
584 | return -EINVAL; | |
0af1a450 | 585 | return generic_setlease(file, arg, fl); |
60446067 ME |
586 | } |
587 | ||
da755fdb SW |
588 | static int gfs2_lm_plock_get(struct gfs2_sbd *sdp, struct lm_lockname *name, |
589 | struct file *file, struct file_lock *fl) | |
590 | { | |
591 | int error = -EIO; | |
592 | if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
593 | error = sdp->sd_lockstruct.ls_ops->lm_plock_get( | |
594 | sdp->sd_lockstruct.ls_lockspace, name, file, fl); | |
595 | return error; | |
596 | } | |
597 | ||
598 | static int gfs2_lm_plock(struct gfs2_sbd *sdp, struct lm_lockname *name, | |
599 | struct file *file, int cmd, struct file_lock *fl) | |
600 | { | |
601 | int error = -EIO; | |
602 | if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
603 | error = sdp->sd_lockstruct.ls_ops->lm_plock( | |
604 | sdp->sd_lockstruct.ls_lockspace, name, file, cmd, fl); | |
605 | return error; | |
606 | } | |
607 | ||
608 | static int gfs2_lm_punlock(struct gfs2_sbd *sdp, struct lm_lockname *name, | |
609 | struct file *file, struct file_lock *fl) | |
610 | { | |
611 | int error = -EIO; | |
612 | if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
613 | error = sdp->sd_lockstruct.ls_ops->lm_punlock( | |
614 | sdp->sd_lockstruct.ls_lockspace, name, file, fl); | |
615 | return error; | |
616 | } | |
617 | ||
b3b94faa DT |
618 | /** |
619 | * gfs2_lock - acquire/release a posix lock on a file | |
620 | * @file: the file pointer | |
621 | * @cmd: either modify or retrieve lock state, possibly wait | |
622 | * @fl: type and range of lock | |
623 | * | |
624 | * Returns: errno | |
625 | */ | |
626 | ||
627 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
628 | { | |
feaa7bba SW |
629 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
630 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
b3b94faa | 631 | struct lm_lockname name = |
dbb7cae2 | 632 | { .ln_number = ip->i_no_addr, |
b3b94faa DT |
633 | .ln_type = LM_TYPE_PLOCK }; |
634 | ||
b3b94faa DT |
635 | if (!(fl->fl_flags & FL_POSIX)) |
636 | return -ENOLCK; | |
7afaac62 | 637 | if (__mandatory_lock(&ip->i_inode)) |
b3b94faa DT |
638 | return -ENOLCK; |
639 | ||
586759f0 ME |
640 | if (cmd == F_CANCELLK) { |
641 | /* Hack: */ | |
642 | cmd = F_SETLK; | |
643 | fl->fl_type = F_UNLCK; | |
644 | } | |
b3b94faa DT |
645 | if (IS_GETLK(cmd)) |
646 | return gfs2_lm_plock_get(sdp, &name, file, fl); | |
647 | else if (fl->fl_type == F_UNLCK) | |
648 | return gfs2_lm_punlock(sdp, &name, file, fl); | |
649 | else | |
650 | return gfs2_lm_plock(sdp, &name, file, cmd, fl); | |
651 | } | |
652 | ||
b3b94faa DT |
653 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
654 | { | |
5c676f6d | 655 | struct gfs2_file *fp = file->private_data; |
b3b94faa | 656 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
81454098 | 657 | struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); |
b3b94faa DT |
658 | struct gfs2_glock *gl; |
659 | unsigned int state; | |
660 | int flags; | |
661 | int error = 0; | |
662 | ||
663 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
6802e340 | 664 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; |
b3b94faa | 665 | |
f55ab26a | 666 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
667 | |
668 | gl = fl_gh->gh_gl; | |
669 | if (gl) { | |
670 | if (fl_gh->gh_state == state) | |
671 | goto out; | |
b3b94faa | 672 | flock_lock_file_wait(file, |
907b9bce | 673 | &(struct file_lock){.fl_type = F_UNLCK}); |
b4c20166 AD |
674 | gfs2_glock_dq_wait(fl_gh); |
675 | gfs2_holder_reinit(state, flags, fl_gh); | |
b3b94faa | 676 | } else { |
6802e340 SW |
677 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, |
678 | &gfs2_flock_glops, CREATE, &gl); | |
b3b94faa DT |
679 | if (error) |
680 | goto out; | |
b4c20166 AD |
681 | gfs2_holder_init(gl, state, flags, fl_gh); |
682 | gfs2_glock_put(gl); | |
b3b94faa | 683 | } |
b3b94faa DT |
684 | error = gfs2_glock_nq(fl_gh); |
685 | if (error) { | |
686 | gfs2_holder_uninit(fl_gh); | |
687 | if (error == GLR_TRYFAILED) | |
688 | error = -EAGAIN; | |
689 | } else { | |
690 | error = flock_lock_file_wait(file, fl); | |
feaa7bba | 691 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
b3b94faa DT |
692 | } |
693 | ||
420b9e5e | 694 | out: |
f55ab26a | 695 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
696 | return error; |
697 | } | |
698 | ||
699 | static void do_unflock(struct file *file, struct file_lock *fl) | |
700 | { | |
5c676f6d | 701 | struct gfs2_file *fp = file->private_data; |
b3b94faa DT |
702 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
703 | ||
f55ab26a | 704 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
705 | flock_lock_file_wait(file, fl); |
706 | if (fl_gh->gh_gl) | |
707 | gfs2_glock_dq_uninit(fl_gh); | |
f55ab26a | 708 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
709 | } |
710 | ||
711 | /** | |
712 | * gfs2_flock - acquire/release a flock lock on a file | |
713 | * @file: the file pointer | |
714 | * @cmd: either modify or retrieve lock state, possibly wait | |
715 | * @fl: type and range of lock | |
716 | * | |
717 | * Returns: errno | |
718 | */ | |
719 | ||
720 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
721 | { | |
feaa7bba | 722 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa | 723 | |
b3b94faa DT |
724 | if (!(fl->fl_flags & FL_FLOCK)) |
725 | return -ENOLCK; | |
7afaac62 | 726 | if (__mandatory_lock(&ip->i_inode)) |
b3b94faa DT |
727 | return -ENOLCK; |
728 | ||
b3b94faa DT |
729 | if (fl->fl_type == F_UNLCK) { |
730 | do_unflock(file, fl); | |
731 | return 0; | |
d00223f1 | 732 | } else { |
b3b94faa | 733 | return do_flock(file, cmd, fl); |
d00223f1 | 734 | } |
b3b94faa DT |
735 | } |
736 | ||
b0dd9308 | 737 | const struct file_operations gfs2_file_fops = { |
26c1a574 | 738 | .llseek = gfs2_llseek, |
d00223f1 | 739 | .read = do_sync_read, |
26c1a574 | 740 | .aio_read = generic_file_aio_read, |
d00223f1 | 741 | .write = do_sync_write, |
26c1a574 SW |
742 | .aio_write = generic_file_aio_write, |
743 | .unlocked_ioctl = gfs2_ioctl, | |
744 | .mmap = gfs2_mmap, | |
745 | .open = gfs2_open, | |
746 | .release = gfs2_close, | |
747 | .fsync = gfs2_fsync, | |
748 | .lock = gfs2_lock, | |
26c1a574 SW |
749 | .flock = gfs2_flock, |
750 | .splice_read = generic_file_splice_read, | |
751 | .splice_write = generic_file_splice_write, | |
60446067 | 752 | .setlease = gfs2_setlease, |
b3b94faa DT |
753 | }; |
754 | ||
b0dd9308 | 755 | const struct file_operations gfs2_dir_fops = { |
26c1a574 SW |
756 | .readdir = gfs2_readdir, |
757 | .unlocked_ioctl = gfs2_ioctl, | |
758 | .open = gfs2_open, | |
759 | .release = gfs2_close, | |
760 | .fsync = gfs2_fsync, | |
761 | .lock = gfs2_lock, | |
762 | .flock = gfs2_flock, | |
b3b94faa DT |
763 | }; |
764 | ||
c97bfe43 WC |
765 | const struct file_operations gfs2_file_fops_nolock = { |
766 | .llseek = gfs2_llseek, | |
767 | .read = do_sync_read, | |
768 | .aio_read = generic_file_aio_read, | |
769 | .write = do_sync_write, | |
770 | .aio_write = generic_file_aio_write, | |
771 | .unlocked_ioctl = gfs2_ioctl, | |
772 | .mmap = gfs2_mmap, | |
773 | .open = gfs2_open, | |
774 | .release = gfs2_close, | |
775 | .fsync = gfs2_fsync, | |
776 | .splice_read = generic_file_splice_read, | |
777 | .splice_write = generic_file_splice_write, | |
778 | .setlease = gfs2_setlease, | |
779 | }; | |
780 | ||
781 | const struct file_operations gfs2_dir_fops_nolock = { | |
782 | .readdir = gfs2_readdir, | |
783 | .unlocked_ioctl = gfs2_ioctl, | |
784 | .open = gfs2_open, | |
785 | .release = gfs2_close, | |
786 | .fsync = gfs2_fsync, | |
787 | }; | |
788 |