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> | |
f58ba889 | 18 | #include <linux/mount.h> |
18ec7d5c | 19 | #include <linux/fs.h> |
5c676f6d | 20 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 21 | #include <linux/ext2_fs.h> |
2fe17c10 CH |
22 | #include <linux/falloc.h> |
23 | #include <linux/swap.h> | |
71b86f56 | 24 | #include <linux/crc32.h> |
33c3de32 | 25 | #include <linux/writeback.h> |
b3b94faa | 26 | #include <asm/uaccess.h> |
f057f6cd SW |
27 | #include <linux/dlm.h> |
28 | #include <linux/dlm_plock.h> | |
b3b94faa DT |
29 | |
30 | #include "gfs2.h" | |
5c676f6d | 31 | #include "incore.h" |
b3b94faa DT |
32 | #include "bmap.h" |
33 | #include "dir.h" | |
34 | #include "glock.h" | |
35 | #include "glops.h" | |
36 | #include "inode.h" | |
b3b94faa DT |
37 | #include "log.h" |
38 | #include "meta_io.h" | |
b3b94faa DT |
39 | #include "quota.h" |
40 | #include "rgrp.h" | |
41 | #include "trans.h" | |
5c676f6d | 42 | #include "util.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 | |
383f01fb SW |
161 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags); |
162 | if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA) | |
c9f6a6bb | 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); | |
6b124d8d SW |
175 | unsigned int flags = inode->i_flags; |
176 | ||
9964afbb SW |
177 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC); |
178 | if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode)) | |
179 | inode->i_flags |= S_NOSEC; | |
383f01fb | 180 | if (ip->i_diskflags & GFS2_DIF_IMMUTABLE) |
6b124d8d | 181 | flags |= S_IMMUTABLE; |
383f01fb | 182 | if (ip->i_diskflags & GFS2_DIF_APPENDONLY) |
6b124d8d | 183 | flags |= S_APPEND; |
383f01fb | 184 | if (ip->i_diskflags & GFS2_DIF_NOATIME) |
6b124d8d | 185 | flags |= S_NOATIME; |
383f01fb | 186 | if (ip->i_diskflags & GFS2_DIF_SYNC) |
6b124d8d SW |
187 | flags |= S_SYNC; |
188 | inode->i_flags = flags; | |
189 | } | |
190 | ||
71b86f56 SW |
191 | /* Flags that can be set by user space */ |
192 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
71b86f56 SW |
193 | GFS2_DIF_IMMUTABLE| \ |
194 | GFS2_DIF_APPENDONLY| \ | |
195 | GFS2_DIF_NOATIME| \ | |
196 | GFS2_DIF_SYNC| \ | |
197 | GFS2_DIF_SYSTEM| \ | |
71b86f56 SW |
198 | GFS2_DIF_INHERIT_JDATA) |
199 | ||
200 | /** | |
201 | * gfs2_set_flags - set flags on an inode | |
202 | * @inode: The inode | |
203 | * @flags: The flags to set | |
204 | * @mask: Indicates which flags are valid | |
205 | * | |
206 | */ | |
b09e593d | 207 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
71b86f56 | 208 | { |
81454098 | 209 | struct inode *inode = filp->f_path.dentry->d_inode; |
feaa7bba SW |
210 | struct gfs2_inode *ip = GFS2_I(inode); |
211 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
71b86f56 SW |
212 | struct buffer_head *bh; |
213 | struct gfs2_holder gh; | |
214 | int error; | |
55eccc6d | 215 | u32 new_flags, flags; |
71b86f56 | 216 | |
f58ba889 | 217 | error = mnt_want_write(filp->f_path.mnt); |
52f341cf | 218 | if (error) |
71b86f56 SW |
219 | return error; |
220 | ||
f58ba889 MS |
221 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
222 | if (error) | |
223 | goto out_drop_write; | |
224 | ||
7df0e039 | 225 | error = -EACCES; |
2e149670 | 226 | if (!inode_owner_or_capable(inode)) |
7df0e039 SW |
227 | goto out; |
228 | ||
229 | error = 0; | |
383f01fb | 230 | flags = ip->i_diskflags; |
55eccc6d | 231 | new_flags = (flags & ~mask) | (reqflags & mask); |
71b86f56 SW |
232 | if ((new_flags ^ flags) == 0) |
233 | goto out; | |
234 | ||
235 | error = -EINVAL; | |
236 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) | |
237 | goto out; | |
238 | ||
71b86f56 SW |
239 | error = -EPERM; |
240 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
241 | goto out; | |
242 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
243 | goto out; | |
907b9bce | 244 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
b9cb9813 | 245 | !capable(CAP_LINUX_IMMUTABLE)) |
71b86f56 | 246 | goto out; |
b9cb9813 | 247 | if (!IS_IMMUTABLE(inode)) { |
10556cb2 | 248 | error = gfs2_permission(inode, MAY_WRITE); |
b9cb9813 SW |
249 | if (error) |
250 | goto out; | |
251 | } | |
5561093e SW |
252 | if ((flags ^ new_flags) & GFS2_DIF_JDATA) { |
253 | if (flags & GFS2_DIF_JDATA) | |
254 | gfs2_log_flush(sdp, ip->i_gl); | |
255 | error = filemap_fdatawrite(inode->i_mapping); | |
256 | if (error) | |
257 | goto out; | |
258 | error = filemap_fdatawait(inode->i_mapping); | |
259 | if (error) | |
260 | goto out; | |
261 | } | |
55eccc6d | 262 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
71b86f56 SW |
263 | if (error) |
264 | goto out; | |
55eccc6d SW |
265 | error = gfs2_meta_inode_buffer(ip, &bh); |
266 | if (error) | |
267 | goto out_trans_end; | |
71b86f56 | 268 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
383f01fb | 269 | ip->i_diskflags = new_flags; |
539e5d6b | 270 | gfs2_dinode_out(ip, bh->b_data); |
71b86f56 | 271 | brelse(bh); |
6b124d8d | 272 | gfs2_set_inode_flags(inode); |
5561093e | 273 | gfs2_set_aops(inode); |
55eccc6d SW |
274 | out_trans_end: |
275 | gfs2_trans_end(sdp); | |
71b86f56 SW |
276 | out: |
277 | gfs2_glock_dq_uninit(&gh); | |
f58ba889 MS |
278 | out_drop_write: |
279 | mnt_drop_write(filp->f_path.mnt); | |
71b86f56 SW |
280 | return error; |
281 | } | |
282 | ||
b09e593d | 283 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 284 | { |
b9af7ca6 | 285 | struct inode *inode = filp->f_path.dentry->d_inode; |
128e5eba | 286 | u32 fsflags, gfsflags; |
7df0e039 | 287 | |
128e5eba | 288 | if (get_user(fsflags, ptr)) |
71b86f56 | 289 | return -EFAULT; |
7df0e039 | 290 | |
128e5eba | 291 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); |
b9af7ca6 SW |
292 | if (!S_ISDIR(inode->i_mode)) { |
293 | if (gfsflags & GFS2_DIF_INHERIT_JDATA) | |
294 | gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); | |
b9af7ca6 SW |
295 | return do_gfs2_set_flags(filp, gfsflags, ~0); |
296 | } | |
297 | return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); | |
71b86f56 SW |
298 | } |
299 | ||
b09e593d | 300 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
71b86f56 SW |
301 | { |
302 | switch(cmd) { | |
128e5eba | 303 | case FS_IOC_GETFLAGS: |
b09e593d | 304 | return gfs2_get_flags(filp, (u32 __user *)arg); |
128e5eba | 305 | case FS_IOC_SETFLAGS: |
b09e593d | 306 | return gfs2_set_flags(filp, (u32 __user *)arg); |
71b86f56 SW |
307 | } |
308 | return -ENOTTY; | |
309 | } | |
310 | ||
3cc3f710 SW |
311 | /** |
312 | * gfs2_allocate_page_backing - Use bmap to allocate blocks | |
313 | * @page: The (locked) page to allocate backing for | |
314 | * | |
315 | * We try to allocate all the blocks required for the page in | |
316 | * one go. This might fail for various reasons, so we keep | |
317 | * trying until all the blocks to back this page are allocated. | |
318 | * If some of the blocks are already allocated, thats ok too. | |
319 | */ | |
320 | ||
321 | static int gfs2_allocate_page_backing(struct page *page) | |
322 | { | |
323 | struct inode *inode = page->mapping->host; | |
324 | struct buffer_head bh; | |
325 | unsigned long size = PAGE_CACHE_SIZE; | |
326 | u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
327 | ||
328 | do { | |
329 | bh.b_state = 0; | |
330 | bh.b_size = size; | |
e9e1ef2b | 331 | gfs2_block_map(inode, lblock, &bh, 1); |
3cc3f710 SW |
332 | if (!buffer_mapped(&bh)) |
333 | return -EIO; | |
334 | size -= bh.b_size; | |
335 | lblock += (bh.b_size >> inode->i_blkbits); | |
336 | } while(size > 0); | |
337 | return 0; | |
338 | } | |
339 | ||
340 | /** | |
341 | * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable | |
342 | * @vma: The virtual memory area | |
343 | * @page: The page which is about to become writable | |
344 | * | |
345 | * When the page becomes writable, we need to ensure that we have | |
346 | * blocks allocated on disk to back that page. | |
347 | */ | |
348 | ||
c2ec175c | 349 | static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
3cc3f710 | 350 | { |
c2ec175c | 351 | struct page *page = vmf->page; |
3cc3f710 SW |
352 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; |
353 | struct gfs2_inode *ip = GFS2_I(inode); | |
354 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
355 | unsigned long last_index; | |
c8f554b9 | 356 | u64 pos = page->index << PAGE_CACHE_SHIFT; |
3cc3f710 | 357 | unsigned int data_blocks, ind_blocks, rblocks; |
3cc3f710 SW |
358 | struct gfs2_holder gh; |
359 | struct gfs2_alloc *al; | |
360 | int ret; | |
361 | ||
719ee344 SW |
362 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
363 | ret = gfs2_glock_nq(&gh); | |
3cc3f710 SW |
364 | if (ret) |
365 | goto out; | |
366 | ||
9c538837 SW |
367 | set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); |
368 | set_bit(GIF_SW_PAGED, &ip->i_flags); | |
369 | ||
461cb419 | 370 | if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) |
3cc3f710 | 371 | goto out_unlock; |
6dbd8224 | 372 | ret = -ENOMEM; |
3cc3f710 | 373 | al = gfs2_alloc_get(ip); |
6dbd8224 SW |
374 | if (al == NULL) |
375 | goto out_unlock; | |
376 | ||
d82661d9 | 377 | ret = gfs2_quota_lock_check(ip); |
3cc3f710 SW |
378 | if (ret) |
379 | goto out_alloc_put; | |
7ed122e4 | 380 | gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); |
3cc3f710 SW |
381 | al->al_requested = data_blocks + ind_blocks; |
382 | ret = gfs2_inplace_reserve(ip); | |
383 | if (ret) | |
384 | goto out_quota_unlock; | |
385 | ||
386 | rblocks = RES_DINODE + ind_blocks; | |
387 | if (gfs2_is_jdata(ip)) | |
388 | rblocks += data_blocks ? data_blocks : 1; | |
bf97b673 | 389 | if (ind_blocks || data_blocks) { |
3cc3f710 | 390 | rblocks += RES_STATFS + RES_QUOTA; |
bf97b673 BM |
391 | rblocks += gfs2_rg_blocks(al); |
392 | } | |
3cc3f710 SW |
393 | ret = gfs2_trans_begin(sdp, rblocks, 0); |
394 | if (ret) | |
395 | goto out_trans_fail; | |
396 | ||
397 | lock_page(page); | |
398 | ret = -EINVAL; | |
399 | last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT; | |
400 | if (page->index > last_index) | |
401 | goto out_unlock_page; | |
b7fe2e39 | 402 | ret = 0; |
3cc3f710 SW |
403 | if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping) |
404 | goto out_unlock_page; | |
405 | if (gfs2_is_stuffed(ip)) { | |
406 | ret = gfs2_unstuff_dinode(ip, page); | |
407 | if (ret) | |
408 | goto out_unlock_page; | |
409 | } | |
410 | ret = gfs2_allocate_page_backing(page); | |
411 | ||
412 | out_unlock_page: | |
413 | unlock_page(page); | |
414 | gfs2_trans_end(sdp); | |
415 | out_trans_fail: | |
416 | gfs2_inplace_release(ip); | |
417 | out_quota_unlock: | |
418 | gfs2_quota_unlock(ip); | |
419 | out_alloc_put: | |
420 | gfs2_alloc_put(ip); | |
421 | out_unlock: | |
422 | gfs2_glock_dq(&gh); | |
423 | out: | |
424 | gfs2_holder_uninit(&gh); | |
e56985da SW |
425 | if (ret == -ENOMEM) |
426 | ret = VM_FAULT_OOM; | |
427 | else if (ret) | |
c2ec175c | 428 | ret = VM_FAULT_SIGBUS; |
3cc3f710 SW |
429 | return ret; |
430 | } | |
431 | ||
f0f37e2f | 432 | static const struct vm_operations_struct gfs2_vm_ops = { |
3cc3f710 SW |
433 | .fault = filemap_fault, |
434 | .page_mkwrite = gfs2_page_mkwrite, | |
435 | }; | |
436 | ||
b3b94faa DT |
437 | /** |
438 | * gfs2_mmap - | |
439 | * @file: The file to map | |
440 | * @vma: The VMA which described the mapping | |
441 | * | |
48bf2b17 SW |
442 | * There is no need to get a lock here unless we should be updating |
443 | * atime. We ignore any locking errors since the only consequence is | |
444 | * a missed atime update (which will just be deferred until later). | |
445 | * | |
446 | * Returns: 0 | |
b3b94faa DT |
447 | */ |
448 | ||
449 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
450 | { | |
feaa7bba | 451 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa | 452 | |
b9c93bb7 SW |
453 | if (!(file->f_flags & O_NOATIME) && |
454 | !IS_NOATIME(&ip->i_inode)) { | |
48bf2b17 SW |
455 | struct gfs2_holder i_gh; |
456 | int error; | |
b3b94faa | 457 | |
b9c93bb7 | 458 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
48bf2b17 | 459 | error = gfs2_glock_nq(&i_gh); |
b9c93bb7 SW |
460 | if (error == 0) { |
461 | file_accessed(file); | |
462 | gfs2_glock_dq(&i_gh); | |
463 | } | |
464 | gfs2_holder_uninit(&i_gh); | |
465 | if (error) | |
466 | return error; | |
48bf2b17 | 467 | } |
3cc3f710 | 468 | vma->vm_ops = &gfs2_vm_ops; |
48bf2b17 | 469 | vma->vm_flags |= VM_CAN_NONLINEAR; |
b3b94faa | 470 | |
48bf2b17 | 471 | return 0; |
b3b94faa DT |
472 | } |
473 | ||
474 | /** | |
475 | * gfs2_open - open a file | |
476 | * @inode: the inode to open | |
477 | * @file: the struct file for this opening | |
478 | * | |
479 | * Returns: errno | |
480 | */ | |
481 | ||
482 | static int gfs2_open(struct inode *inode, struct file *file) | |
483 | { | |
feaa7bba | 484 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
485 | struct gfs2_holder i_gh; |
486 | struct gfs2_file *fp; | |
487 | int error; | |
488 | ||
b3b94faa DT |
489 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
490 | if (!fp) | |
491 | return -ENOMEM; | |
492 | ||
f55ab26a | 493 | mutex_init(&fp->f_fl_mutex); |
b3b94faa | 494 | |
feaa7bba | 495 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
5c676f6d | 496 | file->private_data = fp; |
b3b94faa | 497 | |
b60623c2 | 498 | if (S_ISREG(ip->i_inode.i_mode)) { |
b3b94faa DT |
499 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
500 | &i_gh); | |
501 | if (error) | |
502 | goto fail; | |
503 | ||
504 | if (!(file->f_flags & O_LARGEFILE) && | |
a2e0f799 | 505 | i_size_read(inode) > MAX_NON_LFS) { |
a9c62a18 | 506 | error = -EOVERFLOW; |
b3b94faa DT |
507 | goto fail_gunlock; |
508 | } | |
509 | ||
b3b94faa DT |
510 | gfs2_glock_dq_uninit(&i_gh); |
511 | } | |
512 | ||
513 | return 0; | |
514 | ||
420b9e5e | 515 | fail_gunlock: |
b3b94faa | 516 | gfs2_glock_dq_uninit(&i_gh); |
420b9e5e | 517 | fail: |
5c676f6d | 518 | file->private_data = NULL; |
b3b94faa | 519 | kfree(fp); |
b3b94faa DT |
520 | return error; |
521 | } | |
522 | ||
523 | /** | |
524 | * gfs2_close - called to close a struct file | |
525 | * @inode: the inode the struct file belongs to | |
526 | * @file: the struct file being closed | |
527 | * | |
528 | * Returns: errno | |
529 | */ | |
530 | ||
531 | static int gfs2_close(struct inode *inode, struct file *file) | |
532 | { | |
5c676f6d | 533 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
b3b94faa DT |
534 | struct gfs2_file *fp; |
535 | ||
5c676f6d SW |
536 | fp = file->private_data; |
537 | file->private_data = NULL; | |
b3b94faa DT |
538 | |
539 | if (gfs2_assert_warn(sdp, fp)) | |
540 | return -EIO; | |
541 | ||
542 | kfree(fp); | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | /** | |
548 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
02c24a82 JB |
549 | * @file: the file that points to the dentry |
550 | * @start: the start position in the file to sync | |
551 | * @end: the end position in the file to sync | |
dba898b0 | 552 | * @datasync: set if we can ignore timestamp changes |
b3b94faa | 553 | * |
dba898b0 SW |
554 | * The VFS will flush data for us. We only need to worry |
555 | * about metadata here. | |
34126f9f | 556 | * |
b3b94faa DT |
557 | * Returns: errno |
558 | */ | |
559 | ||
02c24a82 JB |
560 | static int gfs2_fsync(struct file *file, loff_t start, loff_t end, |
561 | int datasync) | |
b3b94faa | 562 | { |
7ea80859 | 563 | struct inode *inode = file->f_mapping->host; |
33c3de32 | 564 | int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); |
dba898b0 SW |
565 | struct gfs2_inode *ip = GFS2_I(inode); |
566 | int ret; | |
b3b94faa | 567 | |
02c24a82 JB |
568 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
569 | if (ret) | |
570 | return ret; | |
571 | mutex_lock(&inode->i_mutex); | |
572 | ||
dba898b0 SW |
573 | if (datasync) |
574 | sync_state &= ~I_DIRTY_SYNC; | |
b3b94faa | 575 | |
dba898b0 SW |
576 | if (sync_state) { |
577 | ret = sync_inode_metadata(inode, 1); | |
02c24a82 JB |
578 | if (ret) { |
579 | mutex_unlock(&inode->i_mutex); | |
dba898b0 | 580 | return ret; |
02c24a82 | 581 | } |
dba898b0 | 582 | gfs2_ail_flush(ip->i_gl); |
33c3de32 SW |
583 | } |
584 | ||
02c24a82 | 585 | mutex_unlock(&inode->i_mutex); |
dba898b0 | 586 | return 0; |
b3b94faa DT |
587 | } |
588 | ||
56aa616a SW |
589 | /** |
590 | * gfs2_file_aio_write - Perform a write to a file | |
591 | * @iocb: The io context | |
592 | * @iov: The data to write | |
593 | * @nr_segs: Number of @iov segments | |
594 | * @pos: The file position | |
595 | * | |
596 | * We have to do a lock/unlock here to refresh the inode size for | |
597 | * O_APPEND writes, otherwise we can land up writing at the wrong | |
598 | * offset. There is still a race, but provided the app is using its | |
599 | * own file locking, this will make O_APPEND work as expected. | |
600 | * | |
601 | */ | |
602 | ||
603 | static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
604 | unsigned long nr_segs, loff_t pos) | |
605 | { | |
606 | struct file *file = iocb->ki_filp; | |
607 | ||
608 | if (file->f_flags & O_APPEND) { | |
609 | struct dentry *dentry = file->f_dentry; | |
610 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); | |
611 | struct gfs2_holder gh; | |
612 | int ret; | |
613 | ||
614 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
615 | if (ret) | |
616 | return ret; | |
617 | gfs2_glock_dq_uninit(&gh); | |
618 | } | |
619 | ||
620 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
621 | } | |
622 | ||
0ee53206 BM |
623 | static int empty_write_end(struct page *page, unsigned from, |
624 | unsigned to, int mode) | |
2fe17c10 | 625 | { |
0ee53206 BM |
626 | struct inode *inode = page->mapping->host; |
627 | struct gfs2_inode *ip = GFS2_I(inode); | |
628 | struct buffer_head *bh; | |
629 | unsigned offset, blksize = 1 << inode->i_blkbits; | |
630 | pgoff_t end_index = i_size_read(inode) >> PAGE_CACHE_SHIFT; | |
2fe17c10 | 631 | |
e4a7b7b0 | 632 | zero_user(page, from, to-from); |
2fe17c10 CH |
633 | mark_page_accessed(page); |
634 | ||
0ee53206 BM |
635 | if (page->index < end_index || !(mode & FALLOC_FL_KEEP_SIZE)) { |
636 | if (!gfs2_is_writeback(ip)) | |
637 | gfs2_page_add_databufs(ip, page, from, to); | |
638 | ||
639 | block_commit_write(page, from, to); | |
640 | return 0; | |
641 | } | |
642 | ||
643 | offset = 0; | |
644 | bh = page_buffers(page); | |
645 | while (offset < to) { | |
646 | if (offset >= from) { | |
647 | set_buffer_uptodate(bh); | |
648 | mark_buffer_dirty(bh); | |
649 | clear_buffer_new(bh); | |
650 | write_dirty_buffer(bh, WRITE); | |
651 | } | |
652 | offset += blksize; | |
653 | bh = bh->b_this_page; | |
654 | } | |
2fe17c10 | 655 | |
0ee53206 BM |
656 | offset = 0; |
657 | bh = page_buffers(page); | |
658 | while (offset < to) { | |
659 | if (offset >= from) { | |
660 | wait_on_buffer(bh); | |
661 | if (!buffer_uptodate(bh)) | |
662 | return -EIO; | |
663 | } | |
664 | offset += blksize; | |
665 | bh = bh->b_this_page; | |
666 | } | |
667 | return 0; | |
2fe17c10 CH |
668 | } |
669 | ||
e4a7b7b0 | 670 | static int needs_empty_write(sector_t block, struct inode *inode) |
2fe17c10 | 671 | { |
2fe17c10 | 672 | int error; |
e4a7b7b0 | 673 | struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; |
2fe17c10 | 674 | |
e4a7b7b0 BM |
675 | bh_map.b_size = 1 << inode->i_blkbits; |
676 | error = gfs2_block_map(inode, block, &bh_map, 0); | |
677 | if (unlikely(error)) | |
678 | return error; | |
679 | return !buffer_mapped(&bh_map); | |
680 | } | |
2fe17c10 | 681 | |
0ee53206 BM |
682 | static int write_empty_blocks(struct page *page, unsigned from, unsigned to, |
683 | int mode) | |
e4a7b7b0 BM |
684 | { |
685 | struct inode *inode = page->mapping->host; | |
686 | unsigned start, end, next, blksize; | |
687 | sector_t block = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
688 | int ret; | |
2fe17c10 | 689 | |
e4a7b7b0 | 690 | blksize = 1 << inode->i_blkbits; |
2fe17c10 CH |
691 | next = end = 0; |
692 | while (next < from) { | |
e4a7b7b0 BM |
693 | next += blksize; |
694 | block++; | |
2fe17c10 CH |
695 | } |
696 | start = next; | |
697 | do { | |
e4a7b7b0 BM |
698 | next += blksize; |
699 | ret = needs_empty_write(block, inode); | |
700 | if (unlikely(ret < 0)) | |
701 | return ret; | |
702 | if (ret == 0) { | |
2fe17c10 | 703 | if (end) { |
e4a7b7b0 BM |
704 | ret = __block_write_begin(page, start, end - start, |
705 | gfs2_block_map); | |
706 | if (unlikely(ret)) | |
707 | return ret; | |
0ee53206 BM |
708 | ret = empty_write_end(page, start, end, mode); |
709 | if (unlikely(ret)) | |
710 | return ret; | |
2fe17c10 CH |
711 | end = 0; |
712 | } | |
713 | start = next; | |
714 | } | |
715 | else | |
716 | end = next; | |
e4a7b7b0 | 717 | block++; |
2fe17c10 CH |
718 | } while (next < to); |
719 | ||
720 | if (end) { | |
e4a7b7b0 BM |
721 | ret = __block_write_begin(page, start, end - start, gfs2_block_map); |
722 | if (unlikely(ret)) | |
723 | return ret; | |
0ee53206 BM |
724 | ret = empty_write_end(page, start, end, mode); |
725 | if (unlikely(ret)) | |
726 | return ret; | |
2fe17c10 CH |
727 | } |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
732 | static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len, | |
733 | int mode) | |
734 | { | |
735 | struct gfs2_inode *ip = GFS2_I(inode); | |
736 | struct buffer_head *dibh; | |
737 | int error; | |
738 | u64 start = offset >> PAGE_CACHE_SHIFT; | |
739 | unsigned int start_offset = offset & ~PAGE_CACHE_MASK; | |
740 | u64 end = (offset + len - 1) >> PAGE_CACHE_SHIFT; | |
741 | pgoff_t curr; | |
742 | struct page *page; | |
743 | unsigned int end_offset = (offset + len) & ~PAGE_CACHE_MASK; | |
744 | unsigned int from, to; | |
745 | ||
746 | if (!end_offset) | |
747 | end_offset = PAGE_CACHE_SIZE; | |
748 | ||
749 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
750 | if (unlikely(error)) | |
751 | goto out; | |
752 | ||
753 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
754 | ||
755 | if (gfs2_is_stuffed(ip)) { | |
756 | error = gfs2_unstuff_dinode(ip, NULL); | |
757 | if (unlikely(error)) | |
758 | goto out; | |
759 | } | |
760 | ||
761 | curr = start; | |
762 | offset = start << PAGE_CACHE_SHIFT; | |
763 | from = start_offset; | |
764 | to = PAGE_CACHE_SIZE; | |
765 | while (curr <= end) { | |
766 | page = grab_cache_page_write_begin(inode->i_mapping, curr, | |
767 | AOP_FLAG_NOFS); | |
768 | if (unlikely(!page)) { | |
769 | error = -ENOMEM; | |
770 | goto out; | |
771 | } | |
772 | ||
773 | if (curr == end) | |
774 | to = end_offset; | |
0ee53206 | 775 | error = write_empty_blocks(page, from, to, mode); |
2fe17c10 CH |
776 | if (!error && offset + to > inode->i_size && |
777 | !(mode & FALLOC_FL_KEEP_SIZE)) { | |
778 | i_size_write(inode, offset + to); | |
779 | } | |
780 | unlock_page(page); | |
781 | page_cache_release(page); | |
782 | if (error) | |
783 | goto out; | |
784 | curr++; | |
785 | offset += PAGE_CACHE_SIZE; | |
786 | from = 0; | |
787 | } | |
788 | ||
789 | gfs2_dinode_out(ip, dibh->b_data); | |
790 | mark_inode_dirty(inode); | |
791 | ||
792 | brelse(dibh); | |
793 | ||
794 | out: | |
795 | return error; | |
796 | } | |
797 | ||
798 | static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len, | |
799 | unsigned int *data_blocks, unsigned int *ind_blocks) | |
800 | { | |
801 | const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); | |
802 | unsigned int max_blocks = ip->i_alloc->al_rgd->rd_free_clone; | |
803 | unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1); | |
804 | ||
805 | for (tmp = max_data; tmp > sdp->sd_diptrs;) { | |
806 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); | |
807 | max_data -= tmp; | |
808 | } | |
809 | /* This calculation isn't the exact reverse of gfs2_write_calc_reserve, | |
810 | so it might end up with fewer data blocks */ | |
811 | if (max_data <= *data_blocks) | |
812 | return; | |
813 | *data_blocks = max_data; | |
814 | *ind_blocks = max_blocks - max_data; | |
815 | *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift; | |
816 | if (*len > max) { | |
817 | *len = max; | |
818 | gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks); | |
819 | } | |
820 | } | |
821 | ||
822 | static long gfs2_fallocate(struct file *file, int mode, loff_t offset, | |
823 | loff_t len) | |
824 | { | |
825 | struct inode *inode = file->f_path.dentry->d_inode; | |
826 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
827 | struct gfs2_inode *ip = GFS2_I(inode); | |
828 | unsigned int data_blocks = 0, ind_blocks = 0, rblocks; | |
829 | loff_t bytes, max_bytes; | |
830 | struct gfs2_alloc *al; | |
831 | int error; | |
6905d9e4 | 832 | loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1); |
2fe17c10 CH |
833 | loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift; |
834 | next = (next + 1) << sdp->sd_sb.sb_bsize_shift; | |
835 | ||
836 | /* We only support the FALLOC_FL_KEEP_SIZE mode */ | |
837 | if (mode & ~FALLOC_FL_KEEP_SIZE) | |
838 | return -EOPNOTSUPP; | |
839 | ||
6905d9e4 | 840 | offset &= bsize_mask; |
2fe17c10 CH |
841 | |
842 | len = next - offset; | |
843 | bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2; | |
844 | if (!bytes) | |
845 | bytes = UINT_MAX; | |
6905d9e4 BM |
846 | bytes &= bsize_mask; |
847 | if (bytes == 0) | |
848 | bytes = sdp->sd_sb.sb_bsize; | |
2fe17c10 CH |
849 | |
850 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); | |
851 | error = gfs2_glock_nq(&ip->i_gh); | |
852 | if (unlikely(error)) | |
853 | goto out_uninit; | |
854 | ||
855 | if (!gfs2_write_alloc_required(ip, offset, len)) | |
856 | goto out_unlock; | |
857 | ||
858 | while (len > 0) { | |
859 | if (len < bytes) | |
860 | bytes = len; | |
861 | al = gfs2_alloc_get(ip); | |
862 | if (!al) { | |
863 | error = -ENOMEM; | |
864 | goto out_unlock; | |
865 | } | |
866 | ||
867 | error = gfs2_quota_lock_check(ip); | |
868 | if (error) | |
869 | goto out_alloc_put; | |
870 | ||
871 | retry: | |
872 | gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks); | |
873 | ||
874 | al->al_requested = data_blocks + ind_blocks; | |
875 | error = gfs2_inplace_reserve(ip); | |
876 | if (error) { | |
877 | if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) { | |
878 | bytes >>= 1; | |
6905d9e4 BM |
879 | bytes &= bsize_mask; |
880 | if (bytes == 0) | |
881 | bytes = sdp->sd_sb.sb_bsize; | |
2fe17c10 CH |
882 | goto retry; |
883 | } | |
884 | goto out_qunlock; | |
885 | } | |
886 | max_bytes = bytes; | |
887 | calc_max_reserv(ip, len, &max_bytes, &data_blocks, &ind_blocks); | |
888 | al->al_requested = data_blocks + ind_blocks; | |
889 | ||
890 | rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA + | |
891 | RES_RG_HDR + gfs2_rg_blocks(al); | |
892 | if (gfs2_is_jdata(ip)) | |
893 | rblocks += data_blocks ? data_blocks : 1; | |
894 | ||
895 | error = gfs2_trans_begin(sdp, rblocks, | |
896 | PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); | |
897 | if (error) | |
898 | goto out_trans_fail; | |
899 | ||
900 | error = fallocate_chunk(inode, offset, max_bytes, mode); | |
901 | gfs2_trans_end(sdp); | |
902 | ||
903 | if (error) | |
904 | goto out_trans_fail; | |
905 | ||
906 | len -= max_bytes; | |
907 | offset += max_bytes; | |
908 | gfs2_inplace_release(ip); | |
909 | gfs2_quota_unlock(ip); | |
910 | gfs2_alloc_put(ip); | |
911 | } | |
912 | goto out_unlock; | |
913 | ||
914 | out_trans_fail: | |
915 | gfs2_inplace_release(ip); | |
916 | out_qunlock: | |
917 | gfs2_quota_unlock(ip); | |
918 | out_alloc_put: | |
919 | gfs2_alloc_put(ip); | |
920 | out_unlock: | |
921 | gfs2_glock_dq(&ip->i_gh); | |
922 | out_uninit: | |
923 | gfs2_holder_uninit(&ip->i_gh); | |
924 | return error; | |
925 | } | |
926 | ||
f057f6cd SW |
927 | #ifdef CONFIG_GFS2_FS_LOCKING_DLM |
928 | ||
60446067 ME |
929 | /** |
930 | * gfs2_setlease - acquire/release a file lease | |
931 | * @file: the file pointer | |
932 | * @arg: lease type | |
933 | * @fl: file lock | |
934 | * | |
f057f6cd SW |
935 | * We don't currently have a way to enforce a lease across the whole |
936 | * cluster; until we do, disable leases (by just returning -EINVAL), | |
937 | * unless the administrator has requested purely local locking. | |
938 | * | |
b89f4321 AB |
939 | * Locking: called under lock_flocks |
940 | * | |
60446067 ME |
941 | * Returns: errno |
942 | */ | |
943 | ||
944 | static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) | |
945 | { | |
f057f6cd | 946 | return -EINVAL; |
da755fdb SW |
947 | } |
948 | ||
b3b94faa DT |
949 | /** |
950 | * gfs2_lock - acquire/release a posix lock on a file | |
951 | * @file: the file pointer | |
952 | * @cmd: either modify or retrieve lock state, possibly wait | |
953 | * @fl: type and range of lock | |
954 | * | |
955 | * Returns: errno | |
956 | */ | |
957 | ||
958 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
959 | { | |
feaa7bba SW |
960 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
961 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
f057f6cd | 962 | struct lm_lockstruct *ls = &sdp->sd_lockstruct; |
b3b94faa | 963 | |
b3b94faa DT |
964 | if (!(fl->fl_flags & FL_POSIX)) |
965 | return -ENOLCK; | |
720e7749 | 966 | if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK) |
b3b94faa DT |
967 | return -ENOLCK; |
968 | ||
586759f0 ME |
969 | if (cmd == F_CANCELLK) { |
970 | /* Hack: */ | |
971 | cmd = F_SETLK; | |
972 | fl->fl_type = F_UNLCK; | |
973 | } | |
f057f6cd SW |
974 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
975 | return -EIO; | |
b3b94faa | 976 | if (IS_GETLK(cmd)) |
f057f6cd | 977 | return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); |
b3b94faa | 978 | else if (fl->fl_type == F_UNLCK) |
f057f6cd | 979 | return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); |
b3b94faa | 980 | else |
f057f6cd | 981 | return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); |
b3b94faa DT |
982 | } |
983 | ||
b3b94faa DT |
984 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
985 | { | |
5c676f6d | 986 | struct gfs2_file *fp = file->private_data; |
b3b94faa | 987 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
81454098 | 988 | struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); |
b3b94faa DT |
989 | struct gfs2_glock *gl; |
990 | unsigned int state; | |
991 | int flags; | |
992 | int error = 0; | |
993 | ||
994 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
6802e340 | 995 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; |
b3b94faa | 996 | |
f55ab26a | 997 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
998 | |
999 | gl = fl_gh->gh_gl; | |
1000 | if (gl) { | |
1001 | if (fl_gh->gh_state == state) | |
1002 | goto out; | |
b3b94faa | 1003 | flock_lock_file_wait(file, |
907b9bce | 1004 | &(struct file_lock){.fl_type = F_UNLCK}); |
b4c20166 AD |
1005 | gfs2_glock_dq_wait(fl_gh); |
1006 | gfs2_holder_reinit(state, flags, fl_gh); | |
b3b94faa | 1007 | } else { |
6802e340 SW |
1008 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, |
1009 | &gfs2_flock_glops, CREATE, &gl); | |
b3b94faa DT |
1010 | if (error) |
1011 | goto out; | |
b4c20166 AD |
1012 | gfs2_holder_init(gl, state, flags, fl_gh); |
1013 | gfs2_glock_put(gl); | |
b3b94faa | 1014 | } |
b3b94faa DT |
1015 | error = gfs2_glock_nq(fl_gh); |
1016 | if (error) { | |
1017 | gfs2_holder_uninit(fl_gh); | |
1018 | if (error == GLR_TRYFAILED) | |
1019 | error = -EAGAIN; | |
1020 | } else { | |
1021 | error = flock_lock_file_wait(file, fl); | |
feaa7bba | 1022 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
b3b94faa DT |
1023 | } |
1024 | ||
420b9e5e | 1025 | out: |
f55ab26a | 1026 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
1027 | return error; |
1028 | } | |
1029 | ||
1030 | static void do_unflock(struct file *file, struct file_lock *fl) | |
1031 | { | |
5c676f6d | 1032 | struct gfs2_file *fp = file->private_data; |
b3b94faa DT |
1033 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
1034 | ||
f55ab26a | 1035 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa | 1036 | flock_lock_file_wait(file, fl); |
0a33443b SW |
1037 | if (fl_gh->gh_gl) { |
1038 | gfs2_glock_dq_wait(fl_gh); | |
1039 | gfs2_holder_uninit(fl_gh); | |
1040 | } | |
f55ab26a | 1041 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
1042 | } |
1043 | ||
1044 | /** | |
1045 | * gfs2_flock - acquire/release a flock lock on a file | |
1046 | * @file: the file pointer | |
1047 | * @cmd: either modify or retrieve lock state, possibly wait | |
1048 | * @fl: type and range of lock | |
1049 | * | |
1050 | * Returns: errno | |
1051 | */ | |
1052 | ||
1053 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
1054 | { | |
b3b94faa DT |
1055 | if (!(fl->fl_flags & FL_FLOCK)) |
1056 | return -ENOLCK; | |
a12af1eb AD |
1057 | if (fl->fl_type & LOCK_MAND) |
1058 | return -EOPNOTSUPP; | |
b3b94faa | 1059 | |
b3b94faa DT |
1060 | if (fl->fl_type == F_UNLCK) { |
1061 | do_unflock(file, fl); | |
1062 | return 0; | |
d00223f1 | 1063 | } else { |
b3b94faa | 1064 | return do_flock(file, cmd, fl); |
d00223f1 | 1065 | } |
b3b94faa DT |
1066 | } |
1067 | ||
10d21988 | 1068 | const struct file_operations gfs2_file_fops = { |
26c1a574 | 1069 | .llseek = gfs2_llseek, |
d00223f1 | 1070 | .read = do_sync_read, |
26c1a574 | 1071 | .aio_read = generic_file_aio_read, |
d00223f1 | 1072 | .write = do_sync_write, |
56aa616a | 1073 | .aio_write = gfs2_file_aio_write, |
26c1a574 SW |
1074 | .unlocked_ioctl = gfs2_ioctl, |
1075 | .mmap = gfs2_mmap, | |
1076 | .open = gfs2_open, | |
1077 | .release = gfs2_close, | |
1078 | .fsync = gfs2_fsync, | |
1079 | .lock = gfs2_lock, | |
26c1a574 SW |
1080 | .flock = gfs2_flock, |
1081 | .splice_read = generic_file_splice_read, | |
1082 | .splice_write = generic_file_splice_write, | |
60446067 | 1083 | .setlease = gfs2_setlease, |
2fe17c10 | 1084 | .fallocate = gfs2_fallocate, |
b3b94faa DT |
1085 | }; |
1086 | ||
10d21988 | 1087 | const struct file_operations gfs2_dir_fops = { |
26c1a574 SW |
1088 | .readdir = gfs2_readdir, |
1089 | .unlocked_ioctl = gfs2_ioctl, | |
1090 | .open = gfs2_open, | |
1091 | .release = gfs2_close, | |
1092 | .fsync = gfs2_fsync, | |
1093 | .lock = gfs2_lock, | |
1094 | .flock = gfs2_flock, | |
6038f373 | 1095 | .llseek = default_llseek, |
b3b94faa DT |
1096 | }; |
1097 | ||
f057f6cd SW |
1098 | #endif /* CONFIG_GFS2_FS_LOCKING_DLM */ |
1099 | ||
10d21988 | 1100 | const struct file_operations gfs2_file_fops_nolock = { |
c97bfe43 WC |
1101 | .llseek = gfs2_llseek, |
1102 | .read = do_sync_read, | |
1103 | .aio_read = generic_file_aio_read, | |
1104 | .write = do_sync_write, | |
56aa616a | 1105 | .aio_write = gfs2_file_aio_write, |
c97bfe43 WC |
1106 | .unlocked_ioctl = gfs2_ioctl, |
1107 | .mmap = gfs2_mmap, | |
1108 | .open = gfs2_open, | |
1109 | .release = gfs2_close, | |
1110 | .fsync = gfs2_fsync, | |
1111 | .splice_read = generic_file_splice_read, | |
1112 | .splice_write = generic_file_splice_write, | |
f057f6cd | 1113 | .setlease = generic_setlease, |
2fe17c10 | 1114 | .fallocate = gfs2_fallocate, |
c97bfe43 WC |
1115 | }; |
1116 | ||
10d21988 | 1117 | const struct file_operations gfs2_dir_fops_nolock = { |
c97bfe43 WC |
1118 | .readdir = gfs2_readdir, |
1119 | .unlocked_ioctl = gfs2_ioctl, | |
1120 | .open = gfs2_open, | |
1121 | .release = gfs2_close, | |
1122 | .fsync = gfs2_fsync, | |
6038f373 | 1123 | .llseek = default_llseek, |
c97bfe43 WC |
1124 | }; |
1125 |