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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" |
b3b94faa | 41 | |
b3b94faa DT |
42 | /** |
43 | * gfs2_llseek - seek to a location in a file | |
44 | * @file: the file | |
45 | * @offset: the offset | |
46 | * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) | |
47 | * | |
48 | * SEEK_END requires the glock for the file because it references the | |
49 | * file's size. | |
50 | * | |
51 | * Returns: The new offset, or errno | |
52 | */ | |
53 | ||
54 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) | |
55 | { | |
feaa7bba | 56 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
57 | struct gfs2_holder i_gh; |
58 | loff_t error; | |
59 | ||
b3b94faa DT |
60 | if (origin == 2) { |
61 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, | |
62 | &i_gh); | |
63 | if (!error) { | |
64 | error = remote_llseek(file, offset, origin); | |
65 | gfs2_glock_dq_uninit(&i_gh); | |
66 | } | |
67 | } else | |
68 | error = remote_llseek(file, offset, origin); | |
69 | ||
70 | return error; | |
71 | } | |
72 | ||
b3b94faa | 73 | /** |
f0e522a9 | 74 | * gfs2_readdir - Read directory entries from a directory |
b3b94faa DT |
75 | * @file: The directory to read from |
76 | * @dirent: Buffer for dirents | |
77 | * @filldir: Function used to do the copying | |
78 | * | |
79 | * Returns: errno | |
80 | */ | |
81 | ||
f0e522a9 | 82 | static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) |
b3b94faa | 83 | { |
71b86f56 | 84 | struct inode *dir = file->f_mapping->host; |
feaa7bba | 85 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 86 | struct gfs2_holder d_gh; |
cd915493 | 87 | u64 offset = file->f_pos; |
b3b94faa DT |
88 | int error; |
89 | ||
b3b94faa DT |
90 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh); |
91 | error = gfs2_glock_nq_atime(&d_gh); | |
92 | if (error) { | |
93 | gfs2_holder_uninit(&d_gh); | |
94 | return error; | |
95 | } | |
96 | ||
3699e3a4 | 97 | error = gfs2_dir_read(dir, &offset, dirent, filldir); |
b3b94faa DT |
98 | |
99 | gfs2_glock_dq_uninit(&d_gh); | |
100 | ||
b3b94faa DT |
101 | file->f_pos = offset; |
102 | ||
b3b94faa DT |
103 | return error; |
104 | } | |
105 | ||
128e5eba SW |
106 | /** |
107 | * fsflags_cvt | |
108 | * @table: A table of 32 u32 flags | |
109 | * @val: a 32 bit value to convert | |
110 | * | |
111 | * This function can be used to convert between fsflags values and | |
112 | * GFS2's own flags values. | |
113 | * | |
114 | * Returns: the converted flags | |
115 | */ | |
116 | static u32 fsflags_cvt(const u32 *table, u32 val) | |
117 | { | |
118 | u32 res = 0; | |
119 | while(val) { | |
120 | if (val & 1) | |
121 | res |= *table; | |
122 | table++; | |
123 | val >>= 1; | |
124 | } | |
125 | return res; | |
126 | } | |
b3b94faa | 127 | |
128e5eba SW |
128 | static const u32 fsflags_to_gfs2[32] = { |
129 | [3] = GFS2_DIF_SYNC, | |
130 | [4] = GFS2_DIF_IMMUTABLE, | |
131 | [5] = GFS2_DIF_APPENDONLY, | |
132 | [7] = GFS2_DIF_NOATIME, | |
133 | [12] = GFS2_DIF_EXHASH, | |
b9af7ca6 SW |
134 | [14] = GFS2_DIF_INHERIT_JDATA, |
135 | [20] = GFS2_DIF_INHERIT_DIRECTIO, | |
71b86f56 SW |
136 | }; |
137 | ||
128e5eba SW |
138 | static const u32 gfs2_to_fsflags[32] = { |
139 | [gfs2fl_Sync] = FS_SYNC_FL, | |
140 | [gfs2fl_Immutable] = FS_IMMUTABLE_FL, | |
141 | [gfs2fl_AppendOnly] = FS_APPEND_FL, | |
142 | [gfs2fl_NoAtime] = FS_NOATIME_FL, | |
143 | [gfs2fl_ExHash] = FS_INDEX_FL, | |
128e5eba SW |
144 | [gfs2fl_InheritDirectio] = FS_DIRECTIO_FL, |
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 SW |
155 | |
156 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); | |
dcd24799 | 157 | error = gfs2_glock_nq_atime(&gh); |
71b86f56 SW |
158 | if (error) |
159 | return error; | |
907b9bce | 160 | |
128e5eba | 161 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags); |
b9af7ca6 SW |
162 | if (!S_ISDIR(inode->i_mode)) { |
163 | if (ip->i_di.di_flags & GFS2_DIF_JDATA) | |
164 | fsflags |= FS_JOURNAL_DATA_FL; | |
165 | if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO) | |
166 | fsflags |= FS_DIRECTIO_FL; | |
167 | } | |
128e5eba | 168 | if (put_user(fsflags, ptr)) |
71b86f56 SW |
169 | error = -EFAULT; |
170 | ||
3cc3f710 | 171 | gfs2_glock_dq(&gh); |
71b86f56 SW |
172 | gfs2_holder_uninit(&gh); |
173 | return error; | |
174 | } | |
175 | ||
6b124d8d SW |
176 | void gfs2_set_inode_flags(struct inode *inode) |
177 | { | |
178 | struct gfs2_inode *ip = GFS2_I(inode); | |
179 | struct gfs2_dinode_host *di = &ip->i_di; | |
180 | unsigned int flags = inode->i_flags; | |
181 | ||
182 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
183 | if (di->di_flags & GFS2_DIF_IMMUTABLE) | |
184 | flags |= S_IMMUTABLE; | |
185 | if (di->di_flags & GFS2_DIF_APPENDONLY) | |
186 | flags |= S_APPEND; | |
187 | if (di->di_flags & GFS2_DIF_NOATIME) | |
188 | flags |= S_NOATIME; | |
189 | if (di->di_flags & GFS2_DIF_SYNC) | |
190 | flags |= S_SYNC; | |
191 | inode->i_flags = flags; | |
192 | } | |
193 | ||
71b86f56 SW |
194 | /* Flags that can be set by user space */ |
195 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
196 | GFS2_DIF_DIRECTIO| \ | |
197 | GFS2_DIF_IMMUTABLE| \ | |
198 | GFS2_DIF_APPENDONLY| \ | |
199 | GFS2_DIF_NOATIME| \ | |
200 | GFS2_DIF_SYNC| \ | |
201 | GFS2_DIF_SYSTEM| \ | |
202 | GFS2_DIF_INHERIT_DIRECTIO| \ | |
203 | GFS2_DIF_INHERIT_JDATA) | |
204 | ||
205 | /** | |
206 | * gfs2_set_flags - set flags on an inode | |
207 | * @inode: The inode | |
208 | * @flags: The flags to set | |
209 | * @mask: Indicates which flags are valid | |
210 | * | |
211 | */ | |
b09e593d | 212 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
71b86f56 | 213 | { |
81454098 | 214 | struct inode *inode = filp->f_path.dentry->d_inode; |
feaa7bba SW |
215 | struct gfs2_inode *ip = GFS2_I(inode); |
216 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
71b86f56 SW |
217 | struct buffer_head *bh; |
218 | struct gfs2_holder gh; | |
219 | int error; | |
55eccc6d | 220 | u32 new_flags, flags; |
71b86f56 | 221 | |
71b86f56 | 222 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
52f341cf | 223 | if (error) |
71b86f56 SW |
224 | return error; |
225 | ||
55eccc6d SW |
226 | flags = ip->i_di.di_flags; |
227 | new_flags = (flags & ~mask) | (reqflags & mask); | |
71b86f56 SW |
228 | if ((new_flags ^ flags) == 0) |
229 | goto out; | |
230 | ||
231 | error = -EINVAL; | |
232 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) | |
233 | goto out; | |
234 | ||
71b86f56 SW |
235 | error = -EPERM; |
236 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
237 | goto out; | |
238 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
239 | goto out; | |
907b9bce | 240 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
b9cb9813 | 241 | !capable(CAP_LINUX_IMMUTABLE)) |
71b86f56 | 242 | goto out; |
b9cb9813 | 243 | if (!IS_IMMUTABLE(inode)) { |
faf450ef | 244 | error = permission(inode, MAY_WRITE, NULL); |
b9cb9813 SW |
245 | if (error) |
246 | goto out; | |
247 | } | |
71b86f56 | 248 | |
55eccc6d | 249 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
71b86f56 SW |
250 | if (error) |
251 | goto out; | |
55eccc6d SW |
252 | error = gfs2_meta_inode_buffer(ip, &bh); |
253 | if (error) | |
254 | goto out_trans_end; | |
71b86f56 SW |
255 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
256 | ip->i_di.di_flags = new_flags; | |
539e5d6b | 257 | gfs2_dinode_out(ip, bh->b_data); |
71b86f56 | 258 | brelse(bh); |
6b124d8d | 259 | gfs2_set_inode_flags(inode); |
55eccc6d SW |
260 | out_trans_end: |
261 | gfs2_trans_end(sdp); | |
71b86f56 SW |
262 | out: |
263 | gfs2_glock_dq_uninit(&gh); | |
264 | return error; | |
265 | } | |
266 | ||
b09e593d | 267 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 268 | { |
b9af7ca6 | 269 | struct inode *inode = filp->f_path.dentry->d_inode; |
128e5eba SW |
270 | u32 fsflags, gfsflags; |
271 | if (get_user(fsflags, ptr)) | |
71b86f56 | 272 | return -EFAULT; |
128e5eba | 273 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); |
b9af7ca6 SW |
274 | if (!S_ISDIR(inode->i_mode)) { |
275 | if (gfsflags & GFS2_DIF_INHERIT_JDATA) | |
276 | gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); | |
277 | if (gfsflags & GFS2_DIF_INHERIT_DIRECTIO) | |
278 | gfsflags ^= (GFS2_DIF_DIRECTIO | GFS2_DIF_INHERIT_DIRECTIO); | |
279 | return do_gfs2_set_flags(filp, gfsflags, ~0); | |
280 | } | |
281 | return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); | |
71b86f56 SW |
282 | } |
283 | ||
b09e593d | 284 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
71b86f56 SW |
285 | { |
286 | switch(cmd) { | |
128e5eba | 287 | case FS_IOC_GETFLAGS: |
b09e593d | 288 | return gfs2_get_flags(filp, (u32 __user *)arg); |
128e5eba | 289 | case FS_IOC_SETFLAGS: |
b09e593d | 290 | return gfs2_set_flags(filp, (u32 __user *)arg); |
71b86f56 SW |
291 | } |
292 | return -ENOTTY; | |
293 | } | |
294 | ||
3cc3f710 SW |
295 | /** |
296 | * gfs2_allocate_page_backing - Use bmap to allocate blocks | |
297 | * @page: The (locked) page to allocate backing for | |
298 | * | |
299 | * We try to allocate all the blocks required for the page in | |
300 | * one go. This might fail for various reasons, so we keep | |
301 | * trying until all the blocks to back this page are allocated. | |
302 | * If some of the blocks are already allocated, thats ok too. | |
303 | */ | |
304 | ||
305 | static int gfs2_allocate_page_backing(struct page *page) | |
306 | { | |
307 | struct inode *inode = page->mapping->host; | |
308 | struct buffer_head bh; | |
309 | unsigned long size = PAGE_CACHE_SIZE; | |
310 | u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
311 | ||
312 | do { | |
313 | bh.b_state = 0; | |
314 | bh.b_size = size; | |
315 | gfs2_block_map(inode, lblock, 1, &bh); | |
316 | if (!buffer_mapped(&bh)) | |
317 | return -EIO; | |
318 | size -= bh.b_size; | |
319 | lblock += (bh.b_size >> inode->i_blkbits); | |
320 | } while(size > 0); | |
321 | return 0; | |
322 | } | |
323 | ||
324 | /** | |
325 | * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable | |
326 | * @vma: The virtual memory area | |
327 | * @page: The page which is about to become writable | |
328 | * | |
329 | * When the page becomes writable, we need to ensure that we have | |
330 | * blocks allocated on disk to back that page. | |
331 | */ | |
332 | ||
333 | static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
334 | { | |
335 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
336 | struct gfs2_inode *ip = GFS2_I(inode); | |
337 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
338 | unsigned long last_index; | |
339 | u64 pos = page->index << (PAGE_CACHE_SIZE - inode->i_blkbits); | |
340 | unsigned int data_blocks, ind_blocks, rblocks; | |
341 | int alloc_required = 0; | |
342 | struct gfs2_holder gh; | |
343 | struct gfs2_alloc *al; | |
344 | int ret; | |
345 | ||
346 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME, &gh); | |
347 | ret = gfs2_glock_nq_atime(&gh); | |
348 | if (ret) | |
349 | goto out; | |
350 | ||
351 | set_bit(GIF_SW_PAGED, &ip->i_flags); | |
352 | gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); | |
353 | ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required); | |
354 | if (ret || !alloc_required) | |
355 | goto out_unlock; | |
356 | ||
357 | ip->i_alloc.al_requested = 0; | |
358 | al = gfs2_alloc_get(ip); | |
359 | ret = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
360 | if (ret) | |
361 | goto out_alloc_put; | |
362 | ret = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid); | |
363 | if (ret) | |
364 | goto out_quota_unlock; | |
365 | al->al_requested = data_blocks + ind_blocks; | |
366 | ret = gfs2_inplace_reserve(ip); | |
367 | if (ret) | |
368 | goto out_quota_unlock; | |
369 | ||
370 | rblocks = RES_DINODE + ind_blocks; | |
371 | if (gfs2_is_jdata(ip)) | |
372 | rblocks += data_blocks ? data_blocks : 1; | |
373 | if (ind_blocks || data_blocks) | |
374 | rblocks += RES_STATFS + RES_QUOTA; | |
375 | ret = gfs2_trans_begin(sdp, rblocks, 0); | |
376 | if (ret) | |
377 | goto out_trans_fail; | |
378 | ||
379 | lock_page(page); | |
380 | ret = -EINVAL; | |
381 | last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT; | |
382 | if (page->index > last_index) | |
383 | goto out_unlock_page; | |
384 | if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping) | |
385 | goto out_unlock_page; | |
386 | if (gfs2_is_stuffed(ip)) { | |
387 | ret = gfs2_unstuff_dinode(ip, page); | |
388 | if (ret) | |
389 | goto out_unlock_page; | |
390 | } | |
391 | ret = gfs2_allocate_page_backing(page); | |
392 | ||
393 | out_unlock_page: | |
394 | unlock_page(page); | |
395 | gfs2_trans_end(sdp); | |
396 | out_trans_fail: | |
397 | gfs2_inplace_release(ip); | |
398 | out_quota_unlock: | |
399 | gfs2_quota_unlock(ip); | |
400 | out_alloc_put: | |
401 | gfs2_alloc_put(ip); | |
402 | out_unlock: | |
403 | gfs2_glock_dq(&gh); | |
404 | out: | |
405 | gfs2_holder_uninit(&gh); | |
406 | return ret; | |
407 | } | |
408 | ||
409 | static struct vm_operations_struct gfs2_vm_ops = { | |
410 | .fault = filemap_fault, | |
411 | .page_mkwrite = gfs2_page_mkwrite, | |
412 | }; | |
413 | ||
71b86f56 | 414 | |
b3b94faa DT |
415 | /** |
416 | * gfs2_mmap - | |
417 | * @file: The file to map | |
418 | * @vma: The VMA which described the mapping | |
419 | * | |
420 | * Returns: 0 or error code | |
421 | */ | |
422 | ||
423 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
424 | { | |
feaa7bba | 425 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
426 | struct gfs2_holder i_gh; |
427 | int error; | |
428 | ||
b3b94faa DT |
429 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); |
430 | error = gfs2_glock_nq_atime(&i_gh); | |
431 | if (error) { | |
432 | gfs2_holder_uninit(&i_gh); | |
433 | return error; | |
434 | } | |
435 | ||
3cc3f710 | 436 | vma->vm_ops = &gfs2_vm_ops; |
b3b94faa DT |
437 | |
438 | gfs2_glock_dq_uninit(&i_gh); | |
439 | ||
440 | return error; | |
441 | } | |
442 | ||
443 | /** | |
444 | * gfs2_open - open a file | |
445 | * @inode: the inode to open | |
446 | * @file: the struct file for this opening | |
447 | * | |
448 | * Returns: errno | |
449 | */ | |
450 | ||
451 | static int gfs2_open(struct inode *inode, struct file *file) | |
452 | { | |
feaa7bba | 453 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
454 | struct gfs2_holder i_gh; |
455 | struct gfs2_file *fp; | |
456 | int error; | |
457 | ||
b3b94faa DT |
458 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
459 | if (!fp) | |
460 | return -ENOMEM; | |
461 | ||
f55ab26a | 462 | mutex_init(&fp->f_fl_mutex); |
b3b94faa | 463 | |
feaa7bba | 464 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
5c676f6d | 465 | file->private_data = fp; |
b3b94faa | 466 | |
b60623c2 | 467 | if (S_ISREG(ip->i_inode.i_mode)) { |
b3b94faa DT |
468 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
469 | &i_gh); | |
470 | if (error) | |
471 | goto fail; | |
472 | ||
473 | if (!(file->f_flags & O_LARGEFILE) && | |
474 | ip->i_di.di_size > MAX_NON_LFS) { | |
a9c62a18 | 475 | error = -EOVERFLOW; |
b3b94faa DT |
476 | goto fail_gunlock; |
477 | } | |
478 | ||
479 | /* Listen to the Direct I/O flag */ | |
480 | ||
481 | if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO) | |
482 | file->f_flags |= O_DIRECT; | |
483 | ||
b3b94faa DT |
484 | gfs2_glock_dq_uninit(&i_gh); |
485 | } | |
486 | ||
487 | return 0; | |
488 | ||
420b9e5e | 489 | fail_gunlock: |
b3b94faa | 490 | gfs2_glock_dq_uninit(&i_gh); |
420b9e5e | 491 | fail: |
5c676f6d | 492 | file->private_data = NULL; |
b3b94faa | 493 | kfree(fp); |
b3b94faa DT |
494 | return error; |
495 | } | |
496 | ||
497 | /** | |
498 | * gfs2_close - called to close a struct file | |
499 | * @inode: the inode the struct file belongs to | |
500 | * @file: the struct file being closed | |
501 | * | |
502 | * Returns: errno | |
503 | */ | |
504 | ||
505 | static int gfs2_close(struct inode *inode, struct file *file) | |
506 | { | |
5c676f6d | 507 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
b3b94faa DT |
508 | struct gfs2_file *fp; |
509 | ||
5c676f6d SW |
510 | fp = file->private_data; |
511 | file->private_data = NULL; | |
b3b94faa DT |
512 | |
513 | if (gfs2_assert_warn(sdp, fp)) | |
514 | return -EIO; | |
515 | ||
516 | kfree(fp); | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
521 | /** | |
522 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
523 | * @file: the file that points to the dentry (we ignore this) | |
524 | * @dentry: the dentry that points to the inode to sync | |
525 | * | |
33c3de32 SW |
526 | * The VFS will flush "normal" data for us. We only need to worry |
527 | * about metadata here. For journaled data, we just do a log flush | |
528 | * as we can't avoid it. Otherwise we can just bale out if datasync | |
529 | * is set. For stuffed inodes we must flush the log in order to | |
530 | * ensure that all data is on disk. | |
531 | * | |
34126f9f SW |
532 | * The call to write_inode_now() is there to write back metadata and |
533 | * the inode itself. It does also try and write the data, but thats | |
534 | * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite() | |
535 | * for us. | |
536 | * | |
b3b94faa DT |
537 | * Returns: errno |
538 | */ | |
539 | ||
540 | static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync) | |
541 | { | |
33c3de32 SW |
542 | struct inode *inode = dentry->d_inode; |
543 | int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); | |
544 | int ret = 0; | |
33c3de32 SW |
545 | |
546 | if (gfs2_is_jdata(GFS2_I(inode))) { | |
547 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); | |
548 | return 0; | |
549 | } | |
b3b94faa | 550 | |
33c3de32 SW |
551 | if (sync_state != 0) { |
552 | if (!datasync) | |
34126f9f | 553 | ret = write_inode_now(inode, 0); |
b3b94faa | 554 | |
33c3de32 SW |
555 | if (gfs2_is_stuffed(GFS2_I(inode))) |
556 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); | |
557 | } | |
558 | ||
559 | return ret; | |
b3b94faa DT |
560 | } |
561 | ||
60446067 ME |
562 | /** |
563 | * gfs2_setlease - acquire/release a file lease | |
564 | * @file: the file pointer | |
565 | * @arg: lease type | |
566 | * @fl: file lock | |
567 | * | |
568 | * Returns: errno | |
569 | */ | |
570 | ||
571 | static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) | |
572 | { | |
573 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
574 | ||
575 | /* | |
576 | * We don't currently have a way to enforce a lease across the whole | |
577 | * cluster; until we do, disable leases (by just returning -EINVAL), | |
578 | * unless the administrator has requested purely local locking. | |
579 | */ | |
580 | if (!sdp->sd_args.ar_localflocks) | |
581 | return -EINVAL; | |
0af1a450 | 582 | return generic_setlease(file, arg, fl); |
60446067 ME |
583 | } |
584 | ||
b3b94faa DT |
585 | /** |
586 | * gfs2_lock - acquire/release a posix lock on a file | |
587 | * @file: the file pointer | |
588 | * @cmd: either modify or retrieve lock state, possibly wait | |
589 | * @fl: type and range of lock | |
590 | * | |
591 | * Returns: errno | |
592 | */ | |
593 | ||
594 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
595 | { | |
feaa7bba SW |
596 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
597 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
b3b94faa | 598 | struct lm_lockname name = |
dbb7cae2 | 599 | { .ln_number = ip->i_no_addr, |
b3b94faa DT |
600 | .ln_type = LM_TYPE_PLOCK }; |
601 | ||
b3b94faa DT |
602 | if (!(fl->fl_flags & FL_POSIX)) |
603 | return -ENOLCK; | |
7afaac62 | 604 | if (__mandatory_lock(&ip->i_inode)) |
b3b94faa DT |
605 | return -ENOLCK; |
606 | ||
607 | if (sdp->sd_args.ar_localflocks) { | |
608 | if (IS_GETLK(cmd)) { | |
9d6a8c5c | 609 | posix_test_lock(file, fl); |
b3b94faa DT |
610 | return 0; |
611 | } else { | |
8628de05 | 612 | return posix_lock_file_wait(file, fl); |
b3b94faa DT |
613 | } |
614 | } | |
615 | ||
586759f0 ME |
616 | if (cmd == F_CANCELLK) { |
617 | /* Hack: */ | |
618 | cmd = F_SETLK; | |
619 | fl->fl_type = F_UNLCK; | |
620 | } | |
b3b94faa DT |
621 | if (IS_GETLK(cmd)) |
622 | return gfs2_lm_plock_get(sdp, &name, file, fl); | |
623 | else if (fl->fl_type == F_UNLCK) | |
624 | return gfs2_lm_punlock(sdp, &name, file, fl); | |
625 | else | |
626 | return gfs2_lm_plock(sdp, &name, file, cmd, fl); | |
627 | } | |
628 | ||
b3b94faa DT |
629 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
630 | { | |
5c676f6d | 631 | struct gfs2_file *fp = file->private_data; |
b3b94faa | 632 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
81454098 | 633 | struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); |
b3b94faa DT |
634 | struct gfs2_glock *gl; |
635 | unsigned int state; | |
636 | int flags; | |
637 | int error = 0; | |
638 | ||
639 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
b4c20166 AD |
640 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE |
641 | | GL_FLOCK; | |
b3b94faa | 642 | |
f55ab26a | 643 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
644 | |
645 | gl = fl_gh->gh_gl; | |
646 | if (gl) { | |
647 | if (fl_gh->gh_state == state) | |
648 | goto out; | |
b3b94faa | 649 | flock_lock_file_wait(file, |
907b9bce | 650 | &(struct file_lock){.fl_type = F_UNLCK}); |
b4c20166 AD |
651 | gfs2_glock_dq_wait(fl_gh); |
652 | gfs2_holder_reinit(state, flags, fl_gh); | |
b3b94faa | 653 | } else { |
feaa7bba | 654 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), |
dbb7cae2 | 655 | ip->i_no_addr, &gfs2_flock_glops, |
b3b94faa DT |
656 | CREATE, &gl); |
657 | if (error) | |
658 | goto out; | |
b4c20166 AD |
659 | gfs2_holder_init(gl, state, flags, fl_gh); |
660 | gfs2_glock_put(gl); | |
b3b94faa | 661 | } |
b3b94faa DT |
662 | error = gfs2_glock_nq(fl_gh); |
663 | if (error) { | |
664 | gfs2_holder_uninit(fl_gh); | |
665 | if (error == GLR_TRYFAILED) | |
666 | error = -EAGAIN; | |
667 | } else { | |
668 | error = flock_lock_file_wait(file, fl); | |
feaa7bba | 669 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
b3b94faa DT |
670 | } |
671 | ||
420b9e5e | 672 | out: |
f55ab26a | 673 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
674 | return error; |
675 | } | |
676 | ||
677 | static void do_unflock(struct file *file, struct file_lock *fl) | |
678 | { | |
5c676f6d | 679 | struct gfs2_file *fp = file->private_data; |
b3b94faa DT |
680 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
681 | ||
f55ab26a | 682 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
683 | flock_lock_file_wait(file, fl); |
684 | if (fl_gh->gh_gl) | |
685 | gfs2_glock_dq_uninit(fl_gh); | |
f55ab26a | 686 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
687 | } |
688 | ||
689 | /** | |
690 | * gfs2_flock - acquire/release a flock lock on a file | |
691 | * @file: the file pointer | |
692 | * @cmd: either modify or retrieve lock state, possibly wait | |
693 | * @fl: type and range of lock | |
694 | * | |
695 | * Returns: errno | |
696 | */ | |
697 | ||
698 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
699 | { | |
feaa7bba SW |
700 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
701 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
b3b94faa | 702 | |
b3b94faa DT |
703 | if (!(fl->fl_flags & FL_FLOCK)) |
704 | return -ENOLCK; | |
7afaac62 | 705 | if (__mandatory_lock(&ip->i_inode)) |
b3b94faa DT |
706 | return -ENOLCK; |
707 | ||
708 | if (sdp->sd_args.ar_localflocks) | |
709 | return flock_lock_file_wait(file, fl); | |
710 | ||
711 | if (fl->fl_type == F_UNLCK) { | |
712 | do_unflock(file, fl); | |
713 | return 0; | |
d00223f1 | 714 | } else { |
b3b94faa | 715 | return do_flock(file, cmd, fl); |
d00223f1 | 716 | } |
b3b94faa DT |
717 | } |
718 | ||
b0dd9308 | 719 | const struct file_operations gfs2_file_fops = { |
26c1a574 | 720 | .llseek = gfs2_llseek, |
d00223f1 | 721 | .read = do_sync_read, |
26c1a574 | 722 | .aio_read = generic_file_aio_read, |
d00223f1 | 723 | .write = do_sync_write, |
26c1a574 SW |
724 | .aio_write = generic_file_aio_write, |
725 | .unlocked_ioctl = gfs2_ioctl, | |
726 | .mmap = gfs2_mmap, | |
727 | .open = gfs2_open, | |
728 | .release = gfs2_close, | |
729 | .fsync = gfs2_fsync, | |
730 | .lock = gfs2_lock, | |
26c1a574 SW |
731 | .flock = gfs2_flock, |
732 | .splice_read = generic_file_splice_read, | |
733 | .splice_write = generic_file_splice_write, | |
60446067 | 734 | .setlease = gfs2_setlease, |
b3b94faa DT |
735 | }; |
736 | ||
b0dd9308 | 737 | const struct file_operations gfs2_dir_fops = { |
26c1a574 SW |
738 | .readdir = gfs2_readdir, |
739 | .unlocked_ioctl = gfs2_ioctl, | |
740 | .open = gfs2_open, | |
741 | .release = gfs2_close, | |
742 | .fsync = gfs2_fsync, | |
743 | .lock = gfs2_lock, | |
744 | .flock = gfs2_flock, | |
b3b94faa DT |
745 | }; |
746 |