Commit | Line | Data |
---|---|---|
b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
b3b94faa DT |
10 | #include <linux/slab.h> |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/completion.h> | |
13 | #include <linux/buffer_head.h> | |
14 | #include <linux/pagemap.h> | |
15 | #include <linux/uio.h> | |
16 | #include <linux/blkdev.h> | |
17 | #include <linux/mm.h> | |
f58ba889 | 18 | #include <linux/mount.h> |
18ec7d5c | 19 | #include <linux/fs.h> |
5c676f6d | 20 | #include <linux/gfs2_ondisk.h> |
71b86f56 SW |
21 | #include <linux/ext2_fs.h> |
22 | #include <linux/crc32.h> | |
7d308590 | 23 | #include <linux/lm_interface.h> |
33c3de32 | 24 | #include <linux/writeback.h> |
b3b94faa DT |
25 | #include <asm/uaccess.h> |
26 | ||
27 | #include "gfs2.h" | |
5c676f6d | 28 | #include "incore.h" |
b3b94faa DT |
29 | #include "bmap.h" |
30 | #include "dir.h" | |
31 | #include "glock.h" | |
32 | #include "glops.h" | |
33 | #include "inode.h" | |
b3b94faa DT |
34 | #include "log.h" |
35 | #include "meta_io.h" | |
b3b94faa DT |
36 | #include "quota.h" |
37 | #include "rgrp.h" | |
38 | #include "trans.h" | |
5c676f6d | 39 | #include "util.h" |
71b86f56 | 40 | #include "eaops.h" |
5561093e | 41 | #include "ops_address.h" |
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) { | |
9465efc9 | 65 | error = generic_file_llseek_unlocked(file, offset, origin); |
b3b94faa DT |
66 | gfs2_glock_dq_uninit(&i_gh); |
67 | } | |
68 | } else | |
9465efc9 | 69 | error = generic_file_llseek_unlocked(file, offset, origin); |
b3b94faa DT |
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 | ||
719ee344 SW |
91 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
92 | error = gfs2_glock_nq(&d_gh); | |
b3b94faa DT |
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 | 135 | [14] = GFS2_DIF_INHERIT_JDATA, |
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 | 144 | [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, |
7ea9ea83 | 145 | }; |
71b86f56 | 146 | |
b09e593d | 147 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 148 | { |
81454098 | 149 | struct inode *inode = filp->f_path.dentry->d_inode; |
feaa7bba | 150 | struct gfs2_inode *ip = GFS2_I(inode); |
71b86f56 SW |
151 | struct gfs2_holder gh; |
152 | int error; | |
128e5eba | 153 | u32 fsflags; |
71b86f56 | 154 | |
719ee344 SW |
155 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
156 | error = gfs2_glock_nq(&gh); | |
71b86f56 SW |
157 | if (error) |
158 | return error; | |
907b9bce | 159 | |
383f01fb SW |
160 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags); |
161 | if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA) | |
c9f6a6bb | 162 | fsflags |= FS_JOURNAL_DATA_FL; |
128e5eba | 163 | if (put_user(fsflags, ptr)) |
71b86f56 SW |
164 | error = -EFAULT; |
165 | ||
3cc3f710 | 166 | gfs2_glock_dq(&gh); |
71b86f56 SW |
167 | gfs2_holder_uninit(&gh); |
168 | return error; | |
169 | } | |
170 | ||
6b124d8d SW |
171 | void gfs2_set_inode_flags(struct inode *inode) |
172 | { | |
173 | struct gfs2_inode *ip = GFS2_I(inode); | |
6b124d8d SW |
174 | unsigned int flags = inode->i_flags; |
175 | ||
176 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
383f01fb | 177 | if (ip->i_diskflags & GFS2_DIF_IMMUTABLE) |
6b124d8d | 178 | flags |= S_IMMUTABLE; |
383f01fb | 179 | if (ip->i_diskflags & GFS2_DIF_APPENDONLY) |
6b124d8d | 180 | flags |= S_APPEND; |
383f01fb | 181 | if (ip->i_diskflags & GFS2_DIF_NOATIME) |
6b124d8d | 182 | flags |= S_NOATIME; |
383f01fb | 183 | if (ip->i_diskflags & GFS2_DIF_SYNC) |
6b124d8d SW |
184 | flags |= S_SYNC; |
185 | inode->i_flags = flags; | |
186 | } | |
187 | ||
71b86f56 SW |
188 | /* Flags that can be set by user space */ |
189 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
71b86f56 SW |
190 | GFS2_DIF_IMMUTABLE| \ |
191 | GFS2_DIF_APPENDONLY| \ | |
192 | GFS2_DIF_NOATIME| \ | |
193 | GFS2_DIF_SYNC| \ | |
194 | GFS2_DIF_SYSTEM| \ | |
71b86f56 SW |
195 | GFS2_DIF_INHERIT_JDATA) |
196 | ||
197 | /** | |
198 | * gfs2_set_flags - set flags on an inode | |
199 | * @inode: The inode | |
200 | * @flags: The flags to set | |
201 | * @mask: Indicates which flags are valid | |
202 | * | |
203 | */ | |
b09e593d | 204 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
71b86f56 | 205 | { |
81454098 | 206 | struct inode *inode = filp->f_path.dentry->d_inode; |
feaa7bba SW |
207 | struct gfs2_inode *ip = GFS2_I(inode); |
208 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
71b86f56 SW |
209 | struct buffer_head *bh; |
210 | struct gfs2_holder gh; | |
211 | int error; | |
55eccc6d | 212 | u32 new_flags, flags; |
71b86f56 | 213 | |
f58ba889 | 214 | error = mnt_want_write(filp->f_path.mnt); |
52f341cf | 215 | if (error) |
71b86f56 SW |
216 | return error; |
217 | ||
f58ba889 MS |
218 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
219 | if (error) | |
220 | goto out_drop_write; | |
221 | ||
383f01fb | 222 | flags = ip->i_diskflags; |
55eccc6d | 223 | new_flags = (flags & ~mask) | (reqflags & mask); |
71b86f56 SW |
224 | if ((new_flags ^ flags) == 0) |
225 | goto out; | |
226 | ||
227 | error = -EINVAL; | |
228 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) | |
229 | goto out; | |
230 | ||
71b86f56 SW |
231 | error = -EPERM; |
232 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
233 | goto out; | |
234 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
235 | goto out; | |
907b9bce | 236 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
b9cb9813 | 237 | !capable(CAP_LINUX_IMMUTABLE)) |
71b86f56 | 238 | goto out; |
b9cb9813 | 239 | if (!IS_IMMUTABLE(inode)) { |
f58ba889 | 240 | error = gfs2_permission(inode, MAY_WRITE); |
b9cb9813 SW |
241 | if (error) |
242 | goto out; | |
243 | } | |
5561093e SW |
244 | if ((flags ^ new_flags) & GFS2_DIF_JDATA) { |
245 | if (flags & GFS2_DIF_JDATA) | |
246 | gfs2_log_flush(sdp, ip->i_gl); | |
247 | error = filemap_fdatawrite(inode->i_mapping); | |
248 | if (error) | |
249 | goto out; | |
250 | error = filemap_fdatawait(inode->i_mapping); | |
251 | if (error) | |
252 | goto out; | |
253 | } | |
55eccc6d | 254 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
71b86f56 SW |
255 | if (error) |
256 | goto out; | |
55eccc6d SW |
257 | error = gfs2_meta_inode_buffer(ip, &bh); |
258 | if (error) | |
259 | goto out_trans_end; | |
71b86f56 | 260 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
383f01fb | 261 | ip->i_diskflags = new_flags; |
539e5d6b | 262 | gfs2_dinode_out(ip, bh->b_data); |
71b86f56 | 263 | brelse(bh); |
6b124d8d | 264 | gfs2_set_inode_flags(inode); |
5561093e | 265 | gfs2_set_aops(inode); |
55eccc6d SW |
266 | out_trans_end: |
267 | gfs2_trans_end(sdp); | |
71b86f56 SW |
268 | out: |
269 | gfs2_glock_dq_uninit(&gh); | |
f58ba889 MS |
270 | out_drop_write: |
271 | mnt_drop_write(filp->f_path.mnt); | |
71b86f56 SW |
272 | return error; |
273 | } | |
274 | ||
b09e593d | 275 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 276 | { |
b9af7ca6 | 277 | struct inode *inode = filp->f_path.dentry->d_inode; |
128e5eba SW |
278 | u32 fsflags, gfsflags; |
279 | if (get_user(fsflags, ptr)) | |
71b86f56 | 280 | return -EFAULT; |
128e5eba | 281 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); |
b9af7ca6 SW |
282 | if (!S_ISDIR(inode->i_mode)) { |
283 | if (gfsflags & GFS2_DIF_INHERIT_JDATA) | |
284 | gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); | |
b9af7ca6 SW |
285 | return do_gfs2_set_flags(filp, gfsflags, ~0); |
286 | } | |
287 | return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); | |
71b86f56 SW |
288 | } |
289 | ||
b09e593d | 290 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
71b86f56 SW |
291 | { |
292 | switch(cmd) { | |
128e5eba | 293 | case FS_IOC_GETFLAGS: |
b09e593d | 294 | return gfs2_get_flags(filp, (u32 __user *)arg); |
128e5eba | 295 | case FS_IOC_SETFLAGS: |
b09e593d | 296 | return gfs2_set_flags(filp, (u32 __user *)arg); |
71b86f56 SW |
297 | } |
298 | return -ENOTTY; | |
299 | } | |
300 | ||
3cc3f710 SW |
301 | /** |
302 | * gfs2_allocate_page_backing - Use bmap to allocate blocks | |
303 | * @page: The (locked) page to allocate backing for | |
304 | * | |
305 | * We try to allocate all the blocks required for the page in | |
306 | * one go. This might fail for various reasons, so we keep | |
307 | * trying until all the blocks to back this page are allocated. | |
308 | * If some of the blocks are already allocated, thats ok too. | |
309 | */ | |
310 | ||
311 | static int gfs2_allocate_page_backing(struct page *page) | |
312 | { | |
313 | struct inode *inode = page->mapping->host; | |
314 | struct buffer_head bh; | |
315 | unsigned long size = PAGE_CACHE_SIZE; | |
316 | u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
317 | ||
318 | do { | |
319 | bh.b_state = 0; | |
320 | bh.b_size = size; | |
e9e1ef2b | 321 | gfs2_block_map(inode, lblock, &bh, 1); |
3cc3f710 SW |
322 | if (!buffer_mapped(&bh)) |
323 | return -EIO; | |
324 | size -= bh.b_size; | |
325 | lblock += (bh.b_size >> inode->i_blkbits); | |
326 | } while(size > 0); | |
327 | return 0; | |
328 | } | |
329 | ||
330 | /** | |
331 | * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable | |
332 | * @vma: The virtual memory area | |
333 | * @page: The page which is about to become writable | |
334 | * | |
335 | * When the page becomes writable, we need to ensure that we have | |
336 | * blocks allocated on disk to back that page. | |
337 | */ | |
338 | ||
339 | static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
340 | { | |
341 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
342 | struct gfs2_inode *ip = GFS2_I(inode); | |
343 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
344 | unsigned long last_index; | |
c8f554b9 | 345 | u64 pos = page->index << PAGE_CACHE_SHIFT; |
3cc3f710 SW |
346 | unsigned int data_blocks, ind_blocks, rblocks; |
347 | int alloc_required = 0; | |
348 | struct gfs2_holder gh; | |
349 | struct gfs2_alloc *al; | |
350 | int ret; | |
351 | ||
719ee344 SW |
352 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
353 | ret = gfs2_glock_nq(&gh); | |
3cc3f710 SW |
354 | if (ret) |
355 | goto out; | |
356 | ||
357 | set_bit(GIF_SW_PAGED, &ip->i_flags); | |
3cc3f710 SW |
358 | ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required); |
359 | if (ret || !alloc_required) | |
360 | goto out_unlock; | |
6dbd8224 | 361 | ret = -ENOMEM; |
3cc3f710 | 362 | al = gfs2_alloc_get(ip); |
6dbd8224 SW |
363 | if (al == NULL) |
364 | goto out_unlock; | |
365 | ||
d82661d9 | 366 | ret = gfs2_quota_lock_check(ip); |
3cc3f710 SW |
367 | if (ret) |
368 | goto out_alloc_put; | |
7ed122e4 | 369 | gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); |
3cc3f710 SW |
370 | al->al_requested = data_blocks + ind_blocks; |
371 | ret = gfs2_inplace_reserve(ip); | |
372 | if (ret) | |
373 | goto out_quota_unlock; | |
374 | ||
375 | rblocks = RES_DINODE + ind_blocks; | |
376 | if (gfs2_is_jdata(ip)) | |
377 | rblocks += data_blocks ? data_blocks : 1; | |
378 | if (ind_blocks || data_blocks) | |
379 | rblocks += RES_STATFS + RES_QUOTA; | |
380 | ret = gfs2_trans_begin(sdp, rblocks, 0); | |
381 | if (ret) | |
382 | goto out_trans_fail; | |
383 | ||
384 | lock_page(page); | |
385 | ret = -EINVAL; | |
386 | last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT; | |
387 | if (page->index > last_index) | |
388 | goto out_unlock_page; | |
b7fe2e39 | 389 | ret = 0; |
3cc3f710 SW |
390 | if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping) |
391 | goto out_unlock_page; | |
392 | if (gfs2_is_stuffed(ip)) { | |
393 | ret = gfs2_unstuff_dinode(ip, page); | |
394 | if (ret) | |
395 | goto out_unlock_page; | |
396 | } | |
397 | ret = gfs2_allocate_page_backing(page); | |
398 | ||
399 | out_unlock_page: | |
400 | unlock_page(page); | |
401 | gfs2_trans_end(sdp); | |
402 | out_trans_fail: | |
403 | gfs2_inplace_release(ip); | |
404 | out_quota_unlock: | |
405 | gfs2_quota_unlock(ip); | |
406 | out_alloc_put: | |
407 | gfs2_alloc_put(ip); | |
408 | out_unlock: | |
409 | gfs2_glock_dq(&gh); | |
410 | out: | |
411 | gfs2_holder_uninit(&gh); | |
412 | return ret; | |
413 | } | |
414 | ||
415 | static struct vm_operations_struct gfs2_vm_ops = { | |
416 | .fault = filemap_fault, | |
417 | .page_mkwrite = gfs2_page_mkwrite, | |
418 | }; | |
419 | ||
71b86f56 | 420 | |
b3b94faa DT |
421 | /** |
422 | * gfs2_mmap - | |
423 | * @file: The file to map | |
424 | * @vma: The VMA which described the mapping | |
425 | * | |
426 | * Returns: 0 or error code | |
427 | */ | |
428 | ||
429 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
430 | { | |
feaa7bba | 431 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
432 | struct gfs2_holder i_gh; |
433 | int error; | |
434 | ||
719ee344 SW |
435 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); |
436 | error = gfs2_glock_nq(&i_gh); | |
b3b94faa DT |
437 | if (error) { |
438 | gfs2_holder_uninit(&i_gh); | |
439 | return error; | |
440 | } | |
441 | ||
3cc3f710 | 442 | vma->vm_ops = &gfs2_vm_ops; |
b3b94faa DT |
443 | |
444 | gfs2_glock_dq_uninit(&i_gh); | |
445 | ||
446 | return error; | |
447 | } | |
448 | ||
449 | /** | |
450 | * gfs2_open - open a file | |
451 | * @inode: the inode to open | |
452 | * @file: the struct file for this opening | |
453 | * | |
454 | * Returns: errno | |
455 | */ | |
456 | ||
457 | static int gfs2_open(struct inode *inode, struct file *file) | |
458 | { | |
feaa7bba | 459 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
460 | struct gfs2_holder i_gh; |
461 | struct gfs2_file *fp; | |
462 | int error; | |
463 | ||
b3b94faa DT |
464 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
465 | if (!fp) | |
466 | return -ENOMEM; | |
467 | ||
f55ab26a | 468 | mutex_init(&fp->f_fl_mutex); |
b3b94faa | 469 | |
feaa7bba | 470 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
5c676f6d | 471 | file->private_data = fp; |
b3b94faa | 472 | |
b60623c2 | 473 | if (S_ISREG(ip->i_inode.i_mode)) { |
b3b94faa DT |
474 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
475 | &i_gh); | |
476 | if (error) | |
477 | goto fail; | |
478 | ||
479 | if (!(file->f_flags & O_LARGEFILE) && | |
c9e98886 | 480 | ip->i_disksize > MAX_NON_LFS) { |
a9c62a18 | 481 | error = -EOVERFLOW; |
b3b94faa DT |
482 | goto fail_gunlock; |
483 | } | |
484 | ||
b3b94faa DT |
485 | gfs2_glock_dq_uninit(&i_gh); |
486 | } | |
487 | ||
488 | return 0; | |
489 | ||
420b9e5e | 490 | fail_gunlock: |
b3b94faa | 491 | gfs2_glock_dq_uninit(&i_gh); |
420b9e5e | 492 | fail: |
5c676f6d | 493 | file->private_data = NULL; |
b3b94faa | 494 | kfree(fp); |
b3b94faa DT |
495 | return error; |
496 | } | |
497 | ||
498 | /** | |
499 | * gfs2_close - called to close a struct file | |
500 | * @inode: the inode the struct file belongs to | |
501 | * @file: the struct file being closed | |
502 | * | |
503 | * Returns: errno | |
504 | */ | |
505 | ||
506 | static int gfs2_close(struct inode *inode, struct file *file) | |
507 | { | |
5c676f6d | 508 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
b3b94faa DT |
509 | struct gfs2_file *fp; |
510 | ||
5c676f6d SW |
511 | fp = file->private_data; |
512 | file->private_data = NULL; | |
b3b94faa DT |
513 | |
514 | if (gfs2_assert_warn(sdp, fp)) | |
515 | return -EIO; | |
516 | ||
517 | kfree(fp); | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
522 | /** | |
523 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
524 | * @file: the file that points to the dentry (we ignore this) | |
525 | * @dentry: the dentry that points to the inode to sync | |
526 | * | |
33c3de32 SW |
527 | * The VFS will flush "normal" data for us. We only need to worry |
528 | * about metadata here. For journaled data, we just do a log flush | |
529 | * as we can't avoid it. Otherwise we can just bale out if datasync | |
530 | * is set. For stuffed inodes we must flush the log in order to | |
531 | * ensure that all data is on disk. | |
532 | * | |
34126f9f SW |
533 | * The call to write_inode_now() is there to write back metadata and |
534 | * the inode itself. It does also try and write the data, but thats | |
535 | * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite() | |
536 | * for us. | |
537 | * | |
b3b94faa DT |
538 | * Returns: errno |
539 | */ | |
540 | ||
541 | static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync) | |
542 | { | |
33c3de32 SW |
543 | struct inode *inode = dentry->d_inode; |
544 | int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); | |
545 | int ret = 0; | |
33c3de32 SW |
546 | |
547 | if (gfs2_is_jdata(GFS2_I(inode))) { | |
548 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); | |
549 | return 0; | |
550 | } | |
b3b94faa | 551 | |
33c3de32 SW |
552 | if (sync_state != 0) { |
553 | if (!datasync) | |
34126f9f | 554 | ret = write_inode_now(inode, 0); |
b3b94faa | 555 | |
33c3de32 SW |
556 | if (gfs2_is_stuffed(GFS2_I(inode))) |
557 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); | |
558 | } | |
559 | ||
560 | return ret; | |
b3b94faa DT |
561 | } |
562 | ||
60446067 ME |
563 | /** |
564 | * gfs2_setlease - acquire/release a file lease | |
565 | * @file: the file pointer | |
566 | * @arg: lease type | |
567 | * @fl: file lock | |
568 | * | |
569 | * Returns: errno | |
570 | */ | |
571 | ||
572 | static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) | |
573 | { | |
574 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
575 | ||
576 | /* | |
577 | * We don't currently have a way to enforce a lease across the whole | |
578 | * cluster; until we do, disable leases (by just returning -EINVAL), | |
579 | * unless the administrator has requested purely local locking. | |
580 | */ | |
581 | if (!sdp->sd_args.ar_localflocks) | |
582 | return -EINVAL; | |
0af1a450 | 583 | return generic_setlease(file, arg, fl); |
60446067 ME |
584 | } |
585 | ||
da755fdb SW |
586 | static int gfs2_lm_plock_get(struct gfs2_sbd *sdp, struct lm_lockname *name, |
587 | struct file *file, struct file_lock *fl) | |
588 | { | |
589 | int error = -EIO; | |
590 | if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
591 | error = sdp->sd_lockstruct.ls_ops->lm_plock_get( | |
592 | sdp->sd_lockstruct.ls_lockspace, name, file, fl); | |
593 | return error; | |
594 | } | |
595 | ||
596 | static int gfs2_lm_plock(struct gfs2_sbd *sdp, struct lm_lockname *name, | |
597 | struct file *file, int cmd, struct file_lock *fl) | |
598 | { | |
599 | int error = -EIO; | |
600 | if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
601 | error = sdp->sd_lockstruct.ls_ops->lm_plock( | |
602 | sdp->sd_lockstruct.ls_lockspace, name, file, cmd, fl); | |
603 | return error; | |
604 | } | |
605 | ||
606 | static int gfs2_lm_punlock(struct gfs2_sbd *sdp, struct lm_lockname *name, | |
607 | struct file *file, struct file_lock *fl) | |
608 | { | |
609 | int error = -EIO; | |
610 | if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
611 | error = sdp->sd_lockstruct.ls_ops->lm_punlock( | |
612 | sdp->sd_lockstruct.ls_lockspace, name, file, fl); | |
613 | return error; | |
614 | } | |
615 | ||
b3b94faa DT |
616 | /** |
617 | * gfs2_lock - acquire/release a posix lock on a file | |
618 | * @file: the file pointer | |
619 | * @cmd: either modify or retrieve lock state, possibly wait | |
620 | * @fl: type and range of lock | |
621 | * | |
622 | * Returns: errno | |
623 | */ | |
624 | ||
625 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
626 | { | |
feaa7bba SW |
627 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
628 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
b3b94faa | 629 | struct lm_lockname name = |
dbb7cae2 | 630 | { .ln_number = ip->i_no_addr, |
b3b94faa DT |
631 | .ln_type = LM_TYPE_PLOCK }; |
632 | ||
b3b94faa DT |
633 | if (!(fl->fl_flags & FL_POSIX)) |
634 | return -ENOLCK; | |
7afaac62 | 635 | if (__mandatory_lock(&ip->i_inode)) |
b3b94faa DT |
636 | return -ENOLCK; |
637 | ||
586759f0 ME |
638 | if (cmd == F_CANCELLK) { |
639 | /* Hack: */ | |
640 | cmd = F_SETLK; | |
641 | fl->fl_type = F_UNLCK; | |
642 | } | |
b3b94faa DT |
643 | if (IS_GETLK(cmd)) |
644 | return gfs2_lm_plock_get(sdp, &name, file, fl); | |
645 | else if (fl->fl_type == F_UNLCK) | |
646 | return gfs2_lm_punlock(sdp, &name, file, fl); | |
647 | else | |
648 | return gfs2_lm_plock(sdp, &name, file, cmd, fl); | |
649 | } | |
650 | ||
b3b94faa DT |
651 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
652 | { | |
5c676f6d | 653 | struct gfs2_file *fp = file->private_data; |
b3b94faa | 654 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
81454098 | 655 | struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); |
b3b94faa DT |
656 | struct gfs2_glock *gl; |
657 | unsigned int state; | |
658 | int flags; | |
659 | int error = 0; | |
660 | ||
661 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
6802e340 | 662 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; |
b3b94faa | 663 | |
f55ab26a | 664 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
665 | |
666 | gl = fl_gh->gh_gl; | |
667 | if (gl) { | |
668 | if (fl_gh->gh_state == state) | |
669 | goto out; | |
b3b94faa | 670 | flock_lock_file_wait(file, |
907b9bce | 671 | &(struct file_lock){.fl_type = F_UNLCK}); |
b4c20166 AD |
672 | gfs2_glock_dq_wait(fl_gh); |
673 | gfs2_holder_reinit(state, flags, fl_gh); | |
b3b94faa | 674 | } else { |
6802e340 SW |
675 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, |
676 | &gfs2_flock_glops, CREATE, &gl); | |
b3b94faa DT |
677 | if (error) |
678 | goto out; | |
b4c20166 AD |
679 | gfs2_holder_init(gl, state, flags, fl_gh); |
680 | gfs2_glock_put(gl); | |
b3b94faa | 681 | } |
b3b94faa DT |
682 | error = gfs2_glock_nq(fl_gh); |
683 | if (error) { | |
684 | gfs2_holder_uninit(fl_gh); | |
685 | if (error == GLR_TRYFAILED) | |
686 | error = -EAGAIN; | |
687 | } else { | |
688 | error = flock_lock_file_wait(file, fl); | |
feaa7bba | 689 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
b3b94faa DT |
690 | } |
691 | ||
420b9e5e | 692 | out: |
f55ab26a | 693 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
694 | return error; |
695 | } | |
696 | ||
697 | static void do_unflock(struct file *file, struct file_lock *fl) | |
698 | { | |
5c676f6d | 699 | struct gfs2_file *fp = file->private_data; |
b3b94faa DT |
700 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
701 | ||
f55ab26a | 702 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
703 | flock_lock_file_wait(file, fl); |
704 | if (fl_gh->gh_gl) | |
705 | gfs2_glock_dq_uninit(fl_gh); | |
f55ab26a | 706 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
707 | } |
708 | ||
709 | /** | |
710 | * gfs2_flock - acquire/release a flock lock on a file | |
711 | * @file: the file pointer | |
712 | * @cmd: either modify or retrieve lock state, possibly wait | |
713 | * @fl: type and range of lock | |
714 | * | |
715 | * Returns: errno | |
716 | */ | |
717 | ||
718 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
719 | { | |
feaa7bba | 720 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa | 721 | |
b3b94faa DT |
722 | if (!(fl->fl_flags & FL_FLOCK)) |
723 | return -ENOLCK; | |
7afaac62 | 724 | if (__mandatory_lock(&ip->i_inode)) |
b3b94faa DT |
725 | return -ENOLCK; |
726 | ||
b3b94faa DT |
727 | if (fl->fl_type == F_UNLCK) { |
728 | do_unflock(file, fl); | |
729 | return 0; | |
d00223f1 | 730 | } else { |
b3b94faa | 731 | return do_flock(file, cmd, fl); |
d00223f1 | 732 | } |
b3b94faa DT |
733 | } |
734 | ||
b0dd9308 | 735 | const struct file_operations gfs2_file_fops = { |
26c1a574 | 736 | .llseek = gfs2_llseek, |
d00223f1 | 737 | .read = do_sync_read, |
26c1a574 | 738 | .aio_read = generic_file_aio_read, |
d00223f1 | 739 | .write = do_sync_write, |
26c1a574 SW |
740 | .aio_write = generic_file_aio_write, |
741 | .unlocked_ioctl = gfs2_ioctl, | |
742 | .mmap = gfs2_mmap, | |
743 | .open = gfs2_open, | |
744 | .release = gfs2_close, | |
745 | .fsync = gfs2_fsync, | |
746 | .lock = gfs2_lock, | |
26c1a574 SW |
747 | .flock = gfs2_flock, |
748 | .splice_read = generic_file_splice_read, | |
749 | .splice_write = generic_file_splice_write, | |
60446067 | 750 | .setlease = gfs2_setlease, |
b3b94faa DT |
751 | }; |
752 | ||
b0dd9308 | 753 | const struct file_operations gfs2_dir_fops = { |
26c1a574 SW |
754 | .readdir = gfs2_readdir, |
755 | .unlocked_ioctl = gfs2_ioctl, | |
756 | .open = gfs2_open, | |
757 | .release = gfs2_close, | |
758 | .fsync = gfs2_fsync, | |
759 | .lock = gfs2_lock, | |
760 | .flock = gfs2_flock, | |
b3b94faa DT |
761 | }; |
762 | ||
c97bfe43 WC |
763 | const struct file_operations gfs2_file_fops_nolock = { |
764 | .llseek = gfs2_llseek, | |
765 | .read = do_sync_read, | |
766 | .aio_read = generic_file_aio_read, | |
767 | .write = do_sync_write, | |
768 | .aio_write = generic_file_aio_write, | |
769 | .unlocked_ioctl = gfs2_ioctl, | |
770 | .mmap = gfs2_mmap, | |
771 | .open = gfs2_open, | |
772 | .release = gfs2_close, | |
773 | .fsync = gfs2_fsync, | |
774 | .splice_read = generic_file_splice_read, | |
775 | .splice_write = generic_file_splice_write, | |
776 | .setlease = gfs2_setlease, | |
777 | }; | |
778 | ||
779 | const struct file_operations gfs2_dir_fops_nolock = { | |
780 | .readdir = gfs2_readdir, | |
781 | .unlocked_ioctl = gfs2_ioctl, | |
782 | .open = gfs2_open, | |
783 | .release = gfs2_close, | |
784 | .fsync = gfs2_fsync, | |
785 | }; | |
786 |