Commit | Line | Data |
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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" | |
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" |
b3b94faa | 42 | |
b3b94faa DT |
43 | /** |
44 | * gfs2_llseek - seek to a location in a file | |
45 | * @file: the file | |
46 | * @offset: the offset | |
47 | * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) | |
48 | * | |
49 | * SEEK_END requires the glock for the file because it references the | |
50 | * file's size. | |
51 | * | |
52 | * Returns: The new offset, or errno | |
53 | */ | |
54 | ||
55 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) | |
56 | { | |
feaa7bba | 57 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
58 | struct gfs2_holder i_gh; |
59 | loff_t error; | |
60 | ||
b3b94faa DT |
61 | if (origin == 2) { |
62 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, | |
63 | &i_gh); | |
64 | if (!error) { | |
65 | error = remote_llseek(file, offset, origin); | |
66 | gfs2_glock_dq_uninit(&i_gh); | |
67 | } | |
68 | } else | |
69 | error = remote_llseek(file, offset, origin); | |
70 | ||
71 | return error; | |
72 | } | |
73 | ||
b3b94faa | 74 | /** |
f0e522a9 | 75 | * gfs2_readdir - Read directory entries from a directory |
b3b94faa DT |
76 | * @file: The directory to read from |
77 | * @dirent: Buffer for dirents | |
78 | * @filldir: Function used to do the copying | |
79 | * | |
80 | * Returns: errno | |
81 | */ | |
82 | ||
f0e522a9 | 83 | static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) |
b3b94faa | 84 | { |
71b86f56 | 85 | struct inode *dir = file->f_mapping->host; |
feaa7bba | 86 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 87 | struct gfs2_holder d_gh; |
cd915493 | 88 | u64 offset = file->f_pos; |
b3b94faa DT |
89 | int error; |
90 | ||
b3b94faa DT |
91 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh); |
92 | error = gfs2_glock_nq_atime(&d_gh); | |
93 | if (error) { | |
94 | gfs2_holder_uninit(&d_gh); | |
95 | return error; | |
96 | } | |
97 | ||
3699e3a4 | 98 | error = gfs2_dir_read(dir, &offset, dirent, filldir); |
b3b94faa DT |
99 | |
100 | gfs2_glock_dq_uninit(&d_gh); | |
101 | ||
b3b94faa DT |
102 | file->f_pos = offset; |
103 | ||
b3b94faa DT |
104 | return error; |
105 | } | |
106 | ||
128e5eba SW |
107 | /** |
108 | * fsflags_cvt | |
109 | * @table: A table of 32 u32 flags | |
110 | * @val: a 32 bit value to convert | |
111 | * | |
112 | * This function can be used to convert between fsflags values and | |
113 | * GFS2's own flags values. | |
114 | * | |
115 | * Returns: the converted flags | |
116 | */ | |
117 | static u32 fsflags_cvt(const u32 *table, u32 val) | |
118 | { | |
119 | u32 res = 0; | |
120 | while(val) { | |
121 | if (val & 1) | |
122 | res |= *table; | |
123 | table++; | |
124 | val >>= 1; | |
125 | } | |
126 | return res; | |
127 | } | |
b3b94faa | 128 | |
128e5eba SW |
129 | static const u32 fsflags_to_gfs2[32] = { |
130 | [3] = GFS2_DIF_SYNC, | |
131 | [4] = GFS2_DIF_IMMUTABLE, | |
132 | [5] = GFS2_DIF_APPENDONLY, | |
133 | [7] = GFS2_DIF_NOATIME, | |
134 | [12] = GFS2_DIF_EXHASH, | |
b9af7ca6 SW |
135 | [14] = GFS2_DIF_INHERIT_JDATA, |
136 | [20] = GFS2_DIF_INHERIT_DIRECTIO, | |
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 SW |
145 | [gfs2fl_InheritDirectio] = FS_DIRECTIO_FL, |
146 | [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, | |
7ea9ea83 | 147 | }; |
71b86f56 | 148 | |
b09e593d | 149 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 150 | { |
81454098 | 151 | struct inode *inode = filp->f_path.dentry->d_inode; |
feaa7bba | 152 | struct gfs2_inode *ip = GFS2_I(inode); |
71b86f56 SW |
153 | struct gfs2_holder gh; |
154 | int error; | |
128e5eba | 155 | u32 fsflags; |
71b86f56 SW |
156 | |
157 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); | |
dcd24799 | 158 | error = gfs2_glock_nq_atime(&gh); |
71b86f56 SW |
159 | if (error) |
160 | return error; | |
907b9bce | 161 | |
128e5eba | 162 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags); |
b9af7ca6 SW |
163 | if (!S_ISDIR(inode->i_mode)) { |
164 | if (ip->i_di.di_flags & GFS2_DIF_JDATA) | |
165 | fsflags |= FS_JOURNAL_DATA_FL; | |
166 | if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO) | |
167 | fsflags |= FS_DIRECTIO_FL; | |
168 | } | |
128e5eba | 169 | if (put_user(fsflags, ptr)) |
71b86f56 SW |
170 | error = -EFAULT; |
171 | ||
3cc3f710 | 172 | gfs2_glock_dq(&gh); |
71b86f56 SW |
173 | gfs2_holder_uninit(&gh); |
174 | return error; | |
175 | } | |
176 | ||
6b124d8d SW |
177 | void gfs2_set_inode_flags(struct inode *inode) |
178 | { | |
179 | struct gfs2_inode *ip = GFS2_I(inode); | |
180 | struct gfs2_dinode_host *di = &ip->i_di; | |
181 | unsigned int flags = inode->i_flags; | |
182 | ||
183 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
184 | if (di->di_flags & GFS2_DIF_IMMUTABLE) | |
185 | flags |= S_IMMUTABLE; | |
186 | if (di->di_flags & GFS2_DIF_APPENDONLY) | |
187 | flags |= S_APPEND; | |
188 | if (di->di_flags & GFS2_DIF_NOATIME) | |
189 | flags |= S_NOATIME; | |
190 | if (di->di_flags & GFS2_DIF_SYNC) | |
191 | flags |= S_SYNC; | |
192 | inode->i_flags = flags; | |
193 | } | |
194 | ||
71b86f56 SW |
195 | /* Flags that can be set by user space */ |
196 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
197 | GFS2_DIF_DIRECTIO| \ | |
198 | GFS2_DIF_IMMUTABLE| \ | |
199 | GFS2_DIF_APPENDONLY| \ | |
200 | GFS2_DIF_NOATIME| \ | |
201 | GFS2_DIF_SYNC| \ | |
202 | GFS2_DIF_SYSTEM| \ | |
203 | GFS2_DIF_INHERIT_DIRECTIO| \ | |
204 | GFS2_DIF_INHERIT_JDATA) | |
205 | ||
206 | /** | |
207 | * gfs2_set_flags - set flags on an inode | |
208 | * @inode: The inode | |
209 | * @flags: The flags to set | |
210 | * @mask: Indicates which flags are valid | |
211 | * | |
212 | */ | |
b09e593d | 213 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
71b86f56 | 214 | { |
81454098 | 215 | struct inode *inode = filp->f_path.dentry->d_inode; |
feaa7bba SW |
216 | struct gfs2_inode *ip = GFS2_I(inode); |
217 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
71b86f56 SW |
218 | struct buffer_head *bh; |
219 | struct gfs2_holder gh; | |
220 | int error; | |
55eccc6d | 221 | u32 new_flags, flags; |
71b86f56 | 222 | |
71b86f56 | 223 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
52f341cf | 224 | if (error) |
71b86f56 SW |
225 | return error; |
226 | ||
55eccc6d SW |
227 | flags = ip->i_di.di_flags; |
228 | new_flags = (flags & ~mask) | (reqflags & mask); | |
71b86f56 SW |
229 | if ((new_flags ^ flags) == 0) |
230 | goto out; | |
231 | ||
232 | error = -EINVAL; | |
233 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) | |
234 | goto out; | |
235 | ||
71b86f56 SW |
236 | error = -EPERM; |
237 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
238 | goto out; | |
239 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
240 | goto out; | |
907b9bce | 241 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
b9cb9813 | 242 | !capable(CAP_LINUX_IMMUTABLE)) |
71b86f56 | 243 | goto out; |
b9cb9813 | 244 | if (!IS_IMMUTABLE(inode)) { |
faf450ef | 245 | error = permission(inode, MAY_WRITE, NULL); |
b9cb9813 SW |
246 | if (error) |
247 | goto out; | |
248 | } | |
5561093e SW |
249 | if ((flags ^ new_flags) & GFS2_DIF_JDATA) { |
250 | if (flags & GFS2_DIF_JDATA) | |
251 | gfs2_log_flush(sdp, ip->i_gl); | |
252 | error = filemap_fdatawrite(inode->i_mapping); | |
253 | if (error) | |
254 | goto out; | |
255 | error = filemap_fdatawait(inode->i_mapping); | |
256 | if (error) | |
257 | goto out; | |
258 | } | |
55eccc6d | 259 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
71b86f56 SW |
260 | if (error) |
261 | goto out; | |
55eccc6d SW |
262 | error = gfs2_meta_inode_buffer(ip, &bh); |
263 | if (error) | |
264 | goto out_trans_end; | |
71b86f56 SW |
265 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
266 | ip->i_di.di_flags = new_flags; | |
539e5d6b | 267 | gfs2_dinode_out(ip, bh->b_data); |
71b86f56 | 268 | brelse(bh); |
6b124d8d | 269 | gfs2_set_inode_flags(inode); |
5561093e | 270 | gfs2_set_aops(inode); |
55eccc6d SW |
271 | out_trans_end: |
272 | gfs2_trans_end(sdp); | |
71b86f56 SW |
273 | out: |
274 | gfs2_glock_dq_uninit(&gh); | |
275 | return error; | |
276 | } | |
277 | ||
b09e593d | 278 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 279 | { |
b9af7ca6 | 280 | struct inode *inode = filp->f_path.dentry->d_inode; |
128e5eba SW |
281 | u32 fsflags, gfsflags; |
282 | if (get_user(fsflags, ptr)) | |
71b86f56 | 283 | return -EFAULT; |
128e5eba | 284 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); |
b9af7ca6 SW |
285 | if (!S_ISDIR(inode->i_mode)) { |
286 | if (gfsflags & GFS2_DIF_INHERIT_JDATA) | |
287 | gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); | |
288 | if (gfsflags & GFS2_DIF_INHERIT_DIRECTIO) | |
289 | gfsflags ^= (GFS2_DIF_DIRECTIO | GFS2_DIF_INHERIT_DIRECTIO); | |
290 | return do_gfs2_set_flags(filp, gfsflags, ~0); | |
291 | } | |
292 | return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); | |
71b86f56 SW |
293 | } |
294 | ||
b09e593d | 295 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
71b86f56 SW |
296 | { |
297 | switch(cmd) { | |
128e5eba | 298 | case FS_IOC_GETFLAGS: |
b09e593d | 299 | return gfs2_get_flags(filp, (u32 __user *)arg); |
128e5eba | 300 | case FS_IOC_SETFLAGS: |
b09e593d | 301 | return gfs2_set_flags(filp, (u32 __user *)arg); |
71b86f56 SW |
302 | } |
303 | return -ENOTTY; | |
304 | } | |
305 | ||
3cc3f710 SW |
306 | /** |
307 | * gfs2_allocate_page_backing - Use bmap to allocate blocks | |
308 | * @page: The (locked) page to allocate backing for | |
309 | * | |
310 | * We try to allocate all the blocks required for the page in | |
311 | * one go. This might fail for various reasons, so we keep | |
312 | * trying until all the blocks to back this page are allocated. | |
313 | * If some of the blocks are already allocated, thats ok too. | |
314 | */ | |
315 | ||
316 | static int gfs2_allocate_page_backing(struct page *page) | |
317 | { | |
318 | struct inode *inode = page->mapping->host; | |
319 | struct buffer_head bh; | |
320 | unsigned long size = PAGE_CACHE_SIZE; | |
321 | u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
322 | ||
323 | do { | |
324 | bh.b_state = 0; | |
325 | bh.b_size = size; | |
e9e1ef2b | 326 | gfs2_block_map(inode, lblock, &bh, 1); |
3cc3f710 SW |
327 | if (!buffer_mapped(&bh)) |
328 | return -EIO; | |
329 | size -= bh.b_size; | |
330 | lblock += (bh.b_size >> inode->i_blkbits); | |
331 | } while(size > 0); | |
332 | return 0; | |
333 | } | |
334 | ||
335 | /** | |
336 | * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable | |
337 | * @vma: The virtual memory area | |
338 | * @page: The page which is about to become writable | |
339 | * | |
340 | * When the page becomes writable, we need to ensure that we have | |
341 | * blocks allocated on disk to back that page. | |
342 | */ | |
343 | ||
344 | static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
345 | { | |
346 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
347 | struct gfs2_inode *ip = GFS2_I(inode); | |
348 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
349 | unsigned long last_index; | |
350 | u64 pos = page->index << (PAGE_CACHE_SIZE - inode->i_blkbits); | |
351 | unsigned int data_blocks, ind_blocks, rblocks; | |
352 | int alloc_required = 0; | |
353 | struct gfs2_holder gh; | |
354 | struct gfs2_alloc *al; | |
355 | int ret; | |
356 | ||
357 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME, &gh); | |
358 | ret = gfs2_glock_nq_atime(&gh); | |
359 | if (ret) | |
360 | goto out; | |
361 | ||
362 | set_bit(GIF_SW_PAGED, &ip->i_flags); | |
363 | gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); | |
364 | ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required); | |
365 | if (ret || !alloc_required) | |
366 | goto out_unlock; | |
6dbd8224 | 367 | ret = -ENOMEM; |
3cc3f710 | 368 | al = gfs2_alloc_get(ip); |
6dbd8224 SW |
369 | if (al == NULL) |
370 | goto out_unlock; | |
371 | ||
3cc3f710 SW |
372 | ret = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
373 | if (ret) | |
374 | goto out_alloc_put; | |
375 | ret = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid); | |
376 | if (ret) | |
377 | goto out_quota_unlock; | |
378 | al->al_requested = data_blocks + ind_blocks; | |
379 | ret = gfs2_inplace_reserve(ip); | |
380 | if (ret) | |
381 | goto out_quota_unlock; | |
382 | ||
383 | rblocks = RES_DINODE + ind_blocks; | |
384 | if (gfs2_is_jdata(ip)) | |
385 | rblocks += data_blocks ? data_blocks : 1; | |
386 | if (ind_blocks || data_blocks) | |
387 | rblocks += RES_STATFS + RES_QUOTA; | |
388 | ret = gfs2_trans_begin(sdp, rblocks, 0); | |
389 | if (ret) | |
390 | goto out_trans_fail; | |
391 | ||
392 | lock_page(page); | |
393 | ret = -EINVAL; | |
394 | last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT; | |
395 | if (page->index > last_index) | |
396 | goto out_unlock_page; | |
b7fe2e39 | 397 | ret = 0; |
3cc3f710 SW |
398 | if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping) |
399 | goto out_unlock_page; | |
400 | if (gfs2_is_stuffed(ip)) { | |
401 | ret = gfs2_unstuff_dinode(ip, page); | |
402 | if (ret) | |
403 | goto out_unlock_page; | |
404 | } | |
405 | ret = gfs2_allocate_page_backing(page); | |
406 | ||
407 | out_unlock_page: | |
408 | unlock_page(page); | |
409 | gfs2_trans_end(sdp); | |
410 | out_trans_fail: | |
411 | gfs2_inplace_release(ip); | |
412 | out_quota_unlock: | |
413 | gfs2_quota_unlock(ip); | |
414 | out_alloc_put: | |
415 | gfs2_alloc_put(ip); | |
416 | out_unlock: | |
417 | gfs2_glock_dq(&gh); | |
418 | out: | |
419 | gfs2_holder_uninit(&gh); | |
420 | return ret; | |
421 | } | |
422 | ||
423 | static struct vm_operations_struct gfs2_vm_ops = { | |
424 | .fault = filemap_fault, | |
425 | .page_mkwrite = gfs2_page_mkwrite, | |
426 | }; | |
427 | ||
71b86f56 | 428 | |
b3b94faa DT |
429 | /** |
430 | * gfs2_mmap - | |
431 | * @file: The file to map | |
432 | * @vma: The VMA which described the mapping | |
433 | * | |
434 | * Returns: 0 or error code | |
435 | */ | |
436 | ||
437 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
438 | { | |
feaa7bba | 439 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
440 | struct gfs2_holder i_gh; |
441 | int error; | |
442 | ||
b3b94faa DT |
443 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); |
444 | error = gfs2_glock_nq_atime(&i_gh); | |
445 | if (error) { | |
446 | gfs2_holder_uninit(&i_gh); | |
447 | return error; | |
448 | } | |
449 | ||
3cc3f710 | 450 | vma->vm_ops = &gfs2_vm_ops; |
b3b94faa DT |
451 | |
452 | gfs2_glock_dq_uninit(&i_gh); | |
453 | ||
454 | return error; | |
455 | } | |
456 | ||
457 | /** | |
458 | * gfs2_open - open a file | |
459 | * @inode: the inode to open | |
460 | * @file: the struct file for this opening | |
461 | * | |
462 | * Returns: errno | |
463 | */ | |
464 | ||
465 | static int gfs2_open(struct inode *inode, struct file *file) | |
466 | { | |
feaa7bba | 467 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
468 | struct gfs2_holder i_gh; |
469 | struct gfs2_file *fp; | |
470 | int error; | |
471 | ||
b3b94faa DT |
472 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
473 | if (!fp) | |
474 | return -ENOMEM; | |
475 | ||
f55ab26a | 476 | mutex_init(&fp->f_fl_mutex); |
b3b94faa | 477 | |
feaa7bba | 478 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
5c676f6d | 479 | file->private_data = fp; |
b3b94faa | 480 | |
b60623c2 | 481 | if (S_ISREG(ip->i_inode.i_mode)) { |
b3b94faa DT |
482 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
483 | &i_gh); | |
484 | if (error) | |
485 | goto fail; | |
486 | ||
487 | if (!(file->f_flags & O_LARGEFILE) && | |
488 | ip->i_di.di_size > MAX_NON_LFS) { | |
a9c62a18 | 489 | error = -EOVERFLOW; |
b3b94faa DT |
490 | goto fail_gunlock; |
491 | } | |
492 | ||
493 | /* Listen to the Direct I/O flag */ | |
494 | ||
495 | if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO) | |
496 | file->f_flags |= O_DIRECT; | |
497 | ||
b3b94faa DT |
498 | gfs2_glock_dq_uninit(&i_gh); |
499 | } | |
500 | ||
501 | return 0; | |
502 | ||
420b9e5e | 503 | fail_gunlock: |
b3b94faa | 504 | gfs2_glock_dq_uninit(&i_gh); |
420b9e5e | 505 | fail: |
5c676f6d | 506 | file->private_data = NULL; |
b3b94faa | 507 | kfree(fp); |
b3b94faa DT |
508 | return error; |
509 | } | |
510 | ||
511 | /** | |
512 | * gfs2_close - called to close a struct file | |
513 | * @inode: the inode the struct file belongs to | |
514 | * @file: the struct file being closed | |
515 | * | |
516 | * Returns: errno | |
517 | */ | |
518 | ||
519 | static int gfs2_close(struct inode *inode, struct file *file) | |
520 | { | |
5c676f6d | 521 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
b3b94faa DT |
522 | struct gfs2_file *fp; |
523 | ||
5c676f6d SW |
524 | fp = file->private_data; |
525 | file->private_data = NULL; | |
b3b94faa DT |
526 | |
527 | if (gfs2_assert_warn(sdp, fp)) | |
528 | return -EIO; | |
529 | ||
530 | kfree(fp); | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
535 | /** | |
536 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
537 | * @file: the file that points to the dentry (we ignore this) | |
538 | * @dentry: the dentry that points to the inode to sync | |
539 | * | |
33c3de32 SW |
540 | * The VFS will flush "normal" data for us. We only need to worry |
541 | * about metadata here. For journaled data, we just do a log flush | |
542 | * as we can't avoid it. Otherwise we can just bale out if datasync | |
543 | * is set. For stuffed inodes we must flush the log in order to | |
544 | * ensure that all data is on disk. | |
545 | * | |
34126f9f SW |
546 | * The call to write_inode_now() is there to write back metadata and |
547 | * the inode itself. It does also try and write the data, but thats | |
548 | * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite() | |
549 | * for us. | |
550 | * | |
b3b94faa DT |
551 | * Returns: errno |
552 | */ | |
553 | ||
554 | static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync) | |
555 | { | |
33c3de32 SW |
556 | struct inode *inode = dentry->d_inode; |
557 | int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); | |
558 | int ret = 0; | |
33c3de32 SW |
559 | |
560 | if (gfs2_is_jdata(GFS2_I(inode))) { | |
561 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); | |
562 | return 0; | |
563 | } | |
b3b94faa | 564 | |
33c3de32 SW |
565 | if (sync_state != 0) { |
566 | if (!datasync) | |
34126f9f | 567 | ret = write_inode_now(inode, 0); |
b3b94faa | 568 | |
33c3de32 SW |
569 | if (gfs2_is_stuffed(GFS2_I(inode))) |
570 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); | |
571 | } | |
572 | ||
573 | return ret; | |
b3b94faa DT |
574 | } |
575 | ||
60446067 ME |
576 | /** |
577 | * gfs2_setlease - acquire/release a file lease | |
578 | * @file: the file pointer | |
579 | * @arg: lease type | |
580 | * @fl: file lock | |
581 | * | |
582 | * Returns: errno | |
583 | */ | |
584 | ||
585 | static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) | |
586 | { | |
587 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
588 | ||
589 | /* | |
590 | * We don't currently have a way to enforce a lease across the whole | |
591 | * cluster; until we do, disable leases (by just returning -EINVAL), | |
592 | * unless the administrator has requested purely local locking. | |
593 | */ | |
594 | if (!sdp->sd_args.ar_localflocks) | |
595 | return -EINVAL; | |
0af1a450 | 596 | return generic_setlease(file, arg, fl); |
60446067 ME |
597 | } |
598 | ||
b3b94faa DT |
599 | /** |
600 | * gfs2_lock - acquire/release a posix lock on a file | |
601 | * @file: the file pointer | |
602 | * @cmd: either modify or retrieve lock state, possibly wait | |
603 | * @fl: type and range of lock | |
604 | * | |
605 | * Returns: errno | |
606 | */ | |
607 | ||
608 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
609 | { | |
feaa7bba SW |
610 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
611 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
b3b94faa | 612 | struct lm_lockname name = |
dbb7cae2 | 613 | { .ln_number = ip->i_no_addr, |
b3b94faa DT |
614 | .ln_type = LM_TYPE_PLOCK }; |
615 | ||
b3b94faa DT |
616 | if (!(fl->fl_flags & FL_POSIX)) |
617 | return -ENOLCK; | |
7afaac62 | 618 | if (__mandatory_lock(&ip->i_inode)) |
b3b94faa DT |
619 | return -ENOLCK; |
620 | ||
586759f0 ME |
621 | if (cmd == F_CANCELLK) { |
622 | /* Hack: */ | |
623 | cmd = F_SETLK; | |
624 | fl->fl_type = F_UNLCK; | |
625 | } | |
b3b94faa DT |
626 | if (IS_GETLK(cmd)) |
627 | return gfs2_lm_plock_get(sdp, &name, file, fl); | |
628 | else if (fl->fl_type == F_UNLCK) | |
629 | return gfs2_lm_punlock(sdp, &name, file, fl); | |
630 | else | |
631 | return gfs2_lm_plock(sdp, &name, file, cmd, fl); | |
632 | } | |
633 | ||
b3b94faa DT |
634 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
635 | { | |
5c676f6d | 636 | struct gfs2_file *fp = file->private_data; |
b3b94faa | 637 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
81454098 | 638 | struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); |
b3b94faa DT |
639 | struct gfs2_glock *gl; |
640 | unsigned int state; | |
641 | int flags; | |
642 | int error = 0; | |
643 | ||
644 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
b4c20166 AD |
645 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE |
646 | | GL_FLOCK; | |
b3b94faa | 647 | |
f55ab26a | 648 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
649 | |
650 | gl = fl_gh->gh_gl; | |
651 | if (gl) { | |
652 | if (fl_gh->gh_state == state) | |
653 | goto out; | |
b3b94faa | 654 | flock_lock_file_wait(file, |
907b9bce | 655 | &(struct file_lock){.fl_type = F_UNLCK}); |
b4c20166 AD |
656 | gfs2_glock_dq_wait(fl_gh); |
657 | gfs2_holder_reinit(state, flags, fl_gh); | |
b3b94faa | 658 | } else { |
feaa7bba | 659 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), |
dbb7cae2 | 660 | ip->i_no_addr, &gfs2_flock_glops, |
b3b94faa DT |
661 | CREATE, &gl); |
662 | if (error) | |
663 | goto out; | |
b4c20166 AD |
664 | gfs2_holder_init(gl, state, flags, fl_gh); |
665 | gfs2_glock_put(gl); | |
b3b94faa | 666 | } |
b3b94faa DT |
667 | error = gfs2_glock_nq(fl_gh); |
668 | if (error) { | |
669 | gfs2_holder_uninit(fl_gh); | |
670 | if (error == GLR_TRYFAILED) | |
671 | error = -EAGAIN; | |
672 | } else { | |
673 | error = flock_lock_file_wait(file, fl); | |
feaa7bba | 674 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
b3b94faa DT |
675 | } |
676 | ||
420b9e5e | 677 | out: |
f55ab26a | 678 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
679 | return error; |
680 | } | |
681 | ||
682 | static void do_unflock(struct file *file, struct file_lock *fl) | |
683 | { | |
5c676f6d | 684 | struct gfs2_file *fp = file->private_data; |
b3b94faa DT |
685 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
686 | ||
f55ab26a | 687 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
688 | flock_lock_file_wait(file, fl); |
689 | if (fl_gh->gh_gl) | |
690 | gfs2_glock_dq_uninit(fl_gh); | |
f55ab26a | 691 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
692 | } |
693 | ||
694 | /** | |
695 | * gfs2_flock - acquire/release a flock lock on a file | |
696 | * @file: the file pointer | |
697 | * @cmd: either modify or retrieve lock state, possibly wait | |
698 | * @fl: type and range of lock | |
699 | * | |
700 | * Returns: errno | |
701 | */ | |
702 | ||
703 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
704 | { | |
feaa7bba | 705 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa | 706 | |
b3b94faa DT |
707 | if (!(fl->fl_flags & FL_FLOCK)) |
708 | return -ENOLCK; | |
7afaac62 | 709 | if (__mandatory_lock(&ip->i_inode)) |
b3b94faa DT |
710 | return -ENOLCK; |
711 | ||
b3b94faa DT |
712 | if (fl->fl_type == F_UNLCK) { |
713 | do_unflock(file, fl); | |
714 | return 0; | |
d00223f1 | 715 | } else { |
b3b94faa | 716 | return do_flock(file, cmd, fl); |
d00223f1 | 717 | } |
b3b94faa DT |
718 | } |
719 | ||
b0dd9308 | 720 | const struct file_operations gfs2_file_fops = { |
26c1a574 | 721 | .llseek = gfs2_llseek, |
d00223f1 | 722 | .read = do_sync_read, |
26c1a574 | 723 | .aio_read = generic_file_aio_read, |
d00223f1 | 724 | .write = do_sync_write, |
26c1a574 SW |
725 | .aio_write = generic_file_aio_write, |
726 | .unlocked_ioctl = gfs2_ioctl, | |
727 | .mmap = gfs2_mmap, | |
728 | .open = gfs2_open, | |
729 | .release = gfs2_close, | |
730 | .fsync = gfs2_fsync, | |
731 | .lock = gfs2_lock, | |
26c1a574 SW |
732 | .flock = gfs2_flock, |
733 | .splice_read = generic_file_splice_read, | |
734 | .splice_write = generic_file_splice_write, | |
60446067 | 735 | .setlease = gfs2_setlease, |
b3b94faa DT |
736 | }; |
737 | ||
b0dd9308 | 738 | const struct file_operations gfs2_dir_fops = { |
26c1a574 SW |
739 | .readdir = gfs2_readdir, |
740 | .unlocked_ioctl = gfs2_ioctl, | |
741 | .open = gfs2_open, | |
742 | .release = gfs2_close, | |
743 | .fsync = gfs2_fsync, | |
744 | .lock = gfs2_lock, | |
745 | .flock = gfs2_flock, | |
b3b94faa DT |
746 | }; |
747 | ||
c97bfe43 WC |
748 | const struct file_operations gfs2_file_fops_nolock = { |
749 | .llseek = gfs2_llseek, | |
750 | .read = do_sync_read, | |
751 | .aio_read = generic_file_aio_read, | |
752 | .write = do_sync_write, | |
753 | .aio_write = generic_file_aio_write, | |
754 | .unlocked_ioctl = gfs2_ioctl, | |
755 | .mmap = gfs2_mmap, | |
756 | .open = gfs2_open, | |
757 | .release = gfs2_close, | |
758 | .fsync = gfs2_fsync, | |
759 | .splice_read = generic_file_splice_read, | |
760 | .splice_write = generic_file_splice_write, | |
761 | .setlease = gfs2_setlease, | |
762 | }; | |
763 | ||
764 | const struct file_operations gfs2_dir_fops_nolock = { | |
765 | .readdir = gfs2_readdir, | |
766 | .unlocked_ioctl = gfs2_ioctl, | |
767 | .open = gfs2_open, | |
768 | .release = gfs2_close, | |
769 | .fsync = gfs2_fsync, | |
770 | }; | |
771 |