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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> | |
f58ba889 | 18 | #include <linux/mount.h> |
18ec7d5c | 19 | #include <linux/fs.h> |
5c676f6d | 20 | #include <linux/gfs2_ondisk.h> |
2fe17c10 CH |
21 | #include <linux/falloc.h> |
22 | #include <linux/swap.h> | |
71b86f56 | 23 | #include <linux/crc32.h> |
33c3de32 | 24 | #include <linux/writeback.h> |
b3b94faa | 25 | #include <asm/uaccess.h> |
f057f6cd SW |
26 | #include <linux/dlm.h> |
27 | #include <linux/dlm_plock.h> | |
b3b94faa DT |
28 | |
29 | #include "gfs2.h" | |
5c676f6d | 30 | #include "incore.h" |
b3b94faa DT |
31 | #include "bmap.h" |
32 | #include "dir.h" | |
33 | #include "glock.h" | |
34 | #include "glops.h" | |
35 | #include "inode.h" | |
b3b94faa DT |
36 | #include "log.h" |
37 | #include "meta_io.h" | |
b3b94faa DT |
38 | #include "quota.h" |
39 | #include "rgrp.h" | |
40 | #include "trans.h" | |
5c676f6d | 41 | #include "util.h" |
b3b94faa | 42 | |
b3b94faa DT |
43 | /** |
44 | * gfs2_llseek - seek to a location in a file | |
45 | * @file: the file | |
46 | * @offset: the offset | |
965c8e59 | 47 | * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) |
b3b94faa DT |
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 | ||
965c8e59 | 55 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence) |
b3b94faa | 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 | ||
965c8e59 | 61 | switch (whence) { |
9453615a SW |
62 | case SEEK_END: /* These reference inode->i_size */ |
63 | case SEEK_DATA: | |
64 | case SEEK_HOLE: | |
b3b94faa DT |
65 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
66 | &i_gh); | |
67 | if (!error) { | |
965c8e59 | 68 | error = generic_file_llseek(file, offset, whence); |
b3b94faa DT |
69 | gfs2_glock_dq_uninit(&i_gh); |
70 | } | |
9453615a SW |
71 | break; |
72 | case SEEK_CUR: | |
73 | case SEEK_SET: | |
965c8e59 | 74 | error = generic_file_llseek(file, offset, whence); |
9453615a SW |
75 | break; |
76 | default: | |
77 | error = -EINVAL; | |
78 | } | |
b3b94faa DT |
79 | |
80 | return error; | |
81 | } | |
82 | ||
b3b94faa | 83 | /** |
f0e522a9 | 84 | * gfs2_readdir - Read directory entries from a directory |
b3b94faa DT |
85 | * @file: The directory to read from |
86 | * @dirent: Buffer for dirents | |
87 | * @filldir: Function used to do the copying | |
88 | * | |
89 | * Returns: errno | |
90 | */ | |
91 | ||
f0e522a9 | 92 | static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) |
b3b94faa | 93 | { |
71b86f56 | 94 | struct inode *dir = file->f_mapping->host; |
feaa7bba | 95 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 96 | struct gfs2_holder d_gh; |
cd915493 | 97 | u64 offset = file->f_pos; |
b3b94faa DT |
98 | int error; |
99 | ||
719ee344 SW |
100 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
101 | error = gfs2_glock_nq(&d_gh); | |
b3b94faa DT |
102 | if (error) { |
103 | gfs2_holder_uninit(&d_gh); | |
104 | return error; | |
105 | } | |
106 | ||
dfe4d34b | 107 | error = gfs2_dir_read(dir, &offset, dirent, filldir, &file->f_ra); |
b3b94faa DT |
108 | |
109 | gfs2_glock_dq_uninit(&d_gh); | |
110 | ||
b3b94faa DT |
111 | file->f_pos = offset; |
112 | ||
b3b94faa DT |
113 | return error; |
114 | } | |
115 | ||
128e5eba SW |
116 | /** |
117 | * fsflags_cvt | |
118 | * @table: A table of 32 u32 flags | |
119 | * @val: a 32 bit value to convert | |
120 | * | |
121 | * This function can be used to convert between fsflags values and | |
122 | * GFS2's own flags values. | |
123 | * | |
124 | * Returns: the converted flags | |
125 | */ | |
126 | static u32 fsflags_cvt(const u32 *table, u32 val) | |
127 | { | |
128 | u32 res = 0; | |
129 | while(val) { | |
130 | if (val & 1) | |
131 | res |= *table; | |
132 | table++; | |
133 | val >>= 1; | |
134 | } | |
135 | return res; | |
136 | } | |
b3b94faa | 137 | |
128e5eba SW |
138 | static const u32 fsflags_to_gfs2[32] = { |
139 | [3] = GFS2_DIF_SYNC, | |
140 | [4] = GFS2_DIF_IMMUTABLE, | |
141 | [5] = GFS2_DIF_APPENDONLY, | |
142 | [7] = GFS2_DIF_NOATIME, | |
143 | [12] = GFS2_DIF_EXHASH, | |
b9af7ca6 | 144 | [14] = GFS2_DIF_INHERIT_JDATA, |
23d0bb83 | 145 | [17] = GFS2_DIF_TOPDIR, |
71b86f56 SW |
146 | }; |
147 | ||
128e5eba SW |
148 | static const u32 gfs2_to_fsflags[32] = { |
149 | [gfs2fl_Sync] = FS_SYNC_FL, | |
150 | [gfs2fl_Immutable] = FS_IMMUTABLE_FL, | |
151 | [gfs2fl_AppendOnly] = FS_APPEND_FL, | |
152 | [gfs2fl_NoAtime] = FS_NOATIME_FL, | |
153 | [gfs2fl_ExHash] = FS_INDEX_FL, | |
23d0bb83 | 154 | [gfs2fl_TopLevel] = FS_TOPDIR_FL, |
128e5eba | 155 | [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, |
7ea9ea83 | 156 | }; |
71b86f56 | 157 | |
b09e593d | 158 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 159 | { |
81454098 | 160 | struct inode *inode = filp->f_path.dentry->d_inode; |
feaa7bba | 161 | struct gfs2_inode *ip = GFS2_I(inode); |
71b86f56 SW |
162 | struct gfs2_holder gh; |
163 | int error; | |
128e5eba | 164 | u32 fsflags; |
71b86f56 | 165 | |
719ee344 SW |
166 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
167 | error = gfs2_glock_nq(&gh); | |
71b86f56 SW |
168 | if (error) |
169 | return error; | |
907b9bce | 170 | |
383f01fb SW |
171 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags); |
172 | if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA) | |
c9f6a6bb | 173 | fsflags |= FS_JOURNAL_DATA_FL; |
128e5eba | 174 | if (put_user(fsflags, ptr)) |
71b86f56 SW |
175 | error = -EFAULT; |
176 | ||
3cc3f710 | 177 | gfs2_glock_dq(&gh); |
71b86f56 SW |
178 | gfs2_holder_uninit(&gh); |
179 | return error; | |
180 | } | |
181 | ||
6b124d8d SW |
182 | void gfs2_set_inode_flags(struct inode *inode) |
183 | { | |
184 | struct gfs2_inode *ip = GFS2_I(inode); | |
6b124d8d SW |
185 | unsigned int flags = inode->i_flags; |
186 | ||
9964afbb SW |
187 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC); |
188 | if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode)) | |
189 | inode->i_flags |= S_NOSEC; | |
383f01fb | 190 | if (ip->i_diskflags & GFS2_DIF_IMMUTABLE) |
6b124d8d | 191 | flags |= S_IMMUTABLE; |
383f01fb | 192 | if (ip->i_diskflags & GFS2_DIF_APPENDONLY) |
6b124d8d | 193 | flags |= S_APPEND; |
383f01fb | 194 | if (ip->i_diskflags & GFS2_DIF_NOATIME) |
6b124d8d | 195 | flags |= S_NOATIME; |
383f01fb | 196 | if (ip->i_diskflags & GFS2_DIF_SYNC) |
6b124d8d SW |
197 | flags |= S_SYNC; |
198 | inode->i_flags = flags; | |
199 | } | |
200 | ||
71b86f56 SW |
201 | /* Flags that can be set by user space */ |
202 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
71b86f56 SW |
203 | GFS2_DIF_IMMUTABLE| \ |
204 | GFS2_DIF_APPENDONLY| \ | |
205 | GFS2_DIF_NOATIME| \ | |
206 | GFS2_DIF_SYNC| \ | |
207 | GFS2_DIF_SYSTEM| \ | |
23d0bb83 | 208 | GFS2_DIF_TOPDIR| \ |
71b86f56 SW |
209 | GFS2_DIF_INHERIT_JDATA) |
210 | ||
211 | /** | |
212 | * gfs2_set_flags - set flags on an inode | |
213 | * @inode: The inode | |
214 | * @flags: The flags to set | |
215 | * @mask: Indicates which flags are valid | |
216 | * | |
217 | */ | |
b09e593d | 218 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
71b86f56 | 219 | { |
81454098 | 220 | struct inode *inode = filp->f_path.dentry->d_inode; |
feaa7bba SW |
221 | struct gfs2_inode *ip = GFS2_I(inode); |
222 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
71b86f56 SW |
223 | struct buffer_head *bh; |
224 | struct gfs2_holder gh; | |
225 | int error; | |
55eccc6d | 226 | u32 new_flags, flags; |
71b86f56 | 227 | |
a561be71 | 228 | error = mnt_want_write_file(filp); |
52f341cf | 229 | if (error) |
71b86f56 SW |
230 | return error; |
231 | ||
f58ba889 MS |
232 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
233 | if (error) | |
234 | goto out_drop_write; | |
235 | ||
7df0e039 | 236 | error = -EACCES; |
2e149670 | 237 | if (!inode_owner_or_capable(inode)) |
7df0e039 SW |
238 | goto out; |
239 | ||
240 | error = 0; | |
383f01fb | 241 | flags = ip->i_diskflags; |
55eccc6d | 242 | new_flags = (flags & ~mask) | (reqflags & mask); |
71b86f56 SW |
243 | if ((new_flags ^ flags) == 0) |
244 | goto out; | |
245 | ||
246 | error = -EINVAL; | |
247 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) | |
248 | goto out; | |
249 | ||
71b86f56 SW |
250 | error = -EPERM; |
251 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
252 | goto out; | |
253 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
254 | goto out; | |
907b9bce | 255 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
b9cb9813 | 256 | !capable(CAP_LINUX_IMMUTABLE)) |
71b86f56 | 257 | goto out; |
b9cb9813 | 258 | if (!IS_IMMUTABLE(inode)) { |
10556cb2 | 259 | error = gfs2_permission(inode, MAY_WRITE); |
b9cb9813 SW |
260 | if (error) |
261 | goto out; | |
262 | } | |
5561093e SW |
263 | if ((flags ^ new_flags) & GFS2_DIF_JDATA) { |
264 | if (flags & GFS2_DIF_JDATA) | |
265 | gfs2_log_flush(sdp, ip->i_gl); | |
266 | error = filemap_fdatawrite(inode->i_mapping); | |
267 | if (error) | |
268 | goto out; | |
269 | error = filemap_fdatawait(inode->i_mapping); | |
270 | if (error) | |
271 | goto out; | |
272 | } | |
55eccc6d | 273 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
71b86f56 SW |
274 | if (error) |
275 | goto out; | |
55eccc6d SW |
276 | error = gfs2_meta_inode_buffer(ip, &bh); |
277 | if (error) | |
278 | goto out_trans_end; | |
71b86f56 | 279 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
383f01fb | 280 | ip->i_diskflags = new_flags; |
539e5d6b | 281 | gfs2_dinode_out(ip, bh->b_data); |
71b86f56 | 282 | brelse(bh); |
6b124d8d | 283 | gfs2_set_inode_flags(inode); |
5561093e | 284 | gfs2_set_aops(inode); |
55eccc6d SW |
285 | out_trans_end: |
286 | gfs2_trans_end(sdp); | |
71b86f56 SW |
287 | out: |
288 | gfs2_glock_dq_uninit(&gh); | |
f58ba889 | 289 | out_drop_write: |
2a79f17e | 290 | mnt_drop_write_file(filp); |
71b86f56 SW |
291 | return error; |
292 | } | |
293 | ||
b09e593d | 294 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 295 | { |
b9af7ca6 | 296 | struct inode *inode = filp->f_path.dentry->d_inode; |
128e5eba | 297 | u32 fsflags, gfsflags; |
7df0e039 | 298 | |
128e5eba | 299 | if (get_user(fsflags, ptr)) |
71b86f56 | 300 | return -EFAULT; |
7df0e039 | 301 | |
128e5eba | 302 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); |
b9af7ca6 | 303 | if (!S_ISDIR(inode->i_mode)) { |
23d0bb83 | 304 | gfsflags &= ~GFS2_DIF_TOPDIR; |
b9af7ca6 SW |
305 | if (gfsflags & GFS2_DIF_INHERIT_JDATA) |
306 | gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); | |
b9af7ca6 SW |
307 | return do_gfs2_set_flags(filp, gfsflags, ~0); |
308 | } | |
309 | return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); | |
71b86f56 SW |
310 | } |
311 | ||
b09e593d | 312 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
71b86f56 SW |
313 | { |
314 | switch(cmd) { | |
128e5eba | 315 | case FS_IOC_GETFLAGS: |
b09e593d | 316 | return gfs2_get_flags(filp, (u32 __user *)arg); |
128e5eba | 317 | case FS_IOC_SETFLAGS: |
b09e593d | 318 | return gfs2_set_flags(filp, (u32 __user *)arg); |
66fc061b SW |
319 | case FITRIM: |
320 | return gfs2_fitrim(filp, (void __user *)arg); | |
71b86f56 SW |
321 | } |
322 | return -ENOTTY; | |
323 | } | |
324 | ||
da1dfb6a SW |
325 | /** |
326 | * gfs2_size_hint - Give a hint to the size of a write request | |
327 | * @file: The struct file | |
328 | * @offset: The file offset of the write | |
329 | * @size: The length of the write | |
330 | * | |
331 | * When we are about to do a write, this function records the total | |
332 | * write size in order to provide a suitable hint to the lower layers | |
333 | * about how many blocks will be required. | |
334 | * | |
335 | */ | |
336 | ||
337 | static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size) | |
338 | { | |
339 | struct inode *inode = filep->f_dentry->d_inode; | |
340 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
341 | struct gfs2_inode *ip = GFS2_I(inode); | |
342 | size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift; | |
343 | int hint = min_t(size_t, INT_MAX, blks); | |
344 | ||
345 | atomic_set(&ip->i_res->rs_sizehint, hint); | |
346 | } | |
347 | ||
3cc3f710 SW |
348 | /** |
349 | * gfs2_allocate_page_backing - Use bmap to allocate blocks | |
350 | * @page: The (locked) page to allocate backing for | |
351 | * | |
352 | * We try to allocate all the blocks required for the page in | |
353 | * one go. This might fail for various reasons, so we keep | |
354 | * trying until all the blocks to back this page are allocated. | |
355 | * If some of the blocks are already allocated, thats ok too. | |
356 | */ | |
357 | ||
358 | static int gfs2_allocate_page_backing(struct page *page) | |
359 | { | |
360 | struct inode *inode = page->mapping->host; | |
361 | struct buffer_head bh; | |
362 | unsigned long size = PAGE_CACHE_SIZE; | |
363 | u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
364 | ||
365 | do { | |
366 | bh.b_state = 0; | |
367 | bh.b_size = size; | |
e9e1ef2b | 368 | gfs2_block_map(inode, lblock, &bh, 1); |
3cc3f710 SW |
369 | if (!buffer_mapped(&bh)) |
370 | return -EIO; | |
371 | size -= bh.b_size; | |
372 | lblock += (bh.b_size >> inode->i_blkbits); | |
373 | } while(size > 0); | |
374 | return 0; | |
375 | } | |
376 | ||
377 | /** | |
378 | * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable | |
379 | * @vma: The virtual memory area | |
380 | * @page: The page which is about to become writable | |
381 | * | |
382 | * When the page becomes writable, we need to ensure that we have | |
383 | * blocks allocated on disk to back that page. | |
384 | */ | |
385 | ||
c2ec175c | 386 | static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
3cc3f710 | 387 | { |
c2ec175c | 388 | struct page *page = vmf->page; |
3cc3f710 SW |
389 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; |
390 | struct gfs2_inode *ip = GFS2_I(inode); | |
391 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
392 | unsigned long last_index; | |
c8f554b9 | 393 | u64 pos = page->index << PAGE_CACHE_SHIFT; |
3cc3f710 | 394 | unsigned int data_blocks, ind_blocks, rblocks; |
3cc3f710 | 395 | struct gfs2_holder gh; |
13d921e3 | 396 | loff_t size; |
3cc3f710 SW |
397 | int ret; |
398 | ||
39263d5e | 399 | sb_start_pagefault(inode->i_sb); |
13d921e3 | 400 | |
a63e9b2e JK |
401 | /* Update file times before taking page lock */ |
402 | file_update_time(vma->vm_file); | |
13d921e3 | 403 | |
0a305e49 BP |
404 | ret = gfs2_rs_alloc(ip); |
405 | if (ret) | |
406 | return ret; | |
407 | ||
da1dfb6a | 408 | gfs2_size_hint(vma->vm_file, pos, PAGE_CACHE_SIZE); |
8e2e0047 | 409 | |
719ee344 SW |
410 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
411 | ret = gfs2_glock_nq(&gh); | |
3cc3f710 SW |
412 | if (ret) |
413 | goto out; | |
414 | ||
9c538837 SW |
415 | set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); |
416 | set_bit(GIF_SW_PAGED, &ip->i_flags); | |
417 | ||
13d921e3 SW |
418 | if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) { |
419 | lock_page(page); | |
420 | if (!PageUptodate(page) || page->mapping != inode->i_mapping) { | |
421 | ret = -EAGAIN; | |
422 | unlock_page(page); | |
423 | } | |
3cc3f710 | 424 | goto out_unlock; |
13d921e3 SW |
425 | } |
426 | ||
5407e242 BP |
427 | ret = gfs2_rindex_update(sdp); |
428 | if (ret) | |
6dbd8224 SW |
429 | goto out_unlock; |
430 | ||
d82661d9 | 431 | ret = gfs2_quota_lock_check(ip); |
3cc3f710 | 432 | if (ret) |
5407e242 | 433 | goto out_unlock; |
7ed122e4 | 434 | gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); |
9dbe9610 | 435 | ret = gfs2_inplace_reserve(ip, data_blocks + ind_blocks, 0); |
3cc3f710 SW |
436 | if (ret) |
437 | goto out_quota_unlock; | |
438 | ||
439 | rblocks = RES_DINODE + ind_blocks; | |
440 | if (gfs2_is_jdata(ip)) | |
441 | rblocks += data_blocks ? data_blocks : 1; | |
bf97b673 | 442 | if (ind_blocks || data_blocks) { |
3cc3f710 | 443 | rblocks += RES_STATFS + RES_QUOTA; |
71f890f7 | 444 | rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks); |
bf97b673 | 445 | } |
3cc3f710 SW |
446 | ret = gfs2_trans_begin(sdp, rblocks, 0); |
447 | if (ret) | |
448 | goto out_trans_fail; | |
449 | ||
450 | lock_page(page); | |
451 | ret = -EINVAL; | |
13d921e3 SW |
452 | size = i_size_read(inode); |
453 | last_index = (size - 1) >> PAGE_CACHE_SHIFT; | |
454 | /* Check page index against inode size */ | |
455 | if (size == 0 || (page->index > last_index)) | |
456 | goto out_trans_end; | |
457 | ||
458 | ret = -EAGAIN; | |
459 | /* If truncated, we must retry the operation, we may have raced | |
460 | * with the glock demotion code. | |
461 | */ | |
462 | if (!PageUptodate(page) || page->mapping != inode->i_mapping) | |
463 | goto out_trans_end; | |
464 | ||
465 | /* Unstuff, if required, and allocate backing blocks for page */ | |
b7fe2e39 | 466 | ret = 0; |
13d921e3 | 467 | if (gfs2_is_stuffed(ip)) |
3cc3f710 | 468 | ret = gfs2_unstuff_dinode(ip, page); |
13d921e3 SW |
469 | if (ret == 0) |
470 | ret = gfs2_allocate_page_backing(page); | |
3cc3f710 | 471 | |
13d921e3 SW |
472 | out_trans_end: |
473 | if (ret) | |
474 | unlock_page(page); | |
3cc3f710 SW |
475 | gfs2_trans_end(sdp); |
476 | out_trans_fail: | |
477 | gfs2_inplace_release(ip); | |
478 | out_quota_unlock: | |
479 | gfs2_quota_unlock(ip); | |
3cc3f710 SW |
480 | out_unlock: |
481 | gfs2_glock_dq(&gh); | |
482 | out: | |
483 | gfs2_holder_uninit(&gh); | |
13d921e3 SW |
484 | if (ret == 0) { |
485 | set_page_dirty(page); | |
39263d5e | 486 | wait_on_page_writeback(page); |
13d921e3 | 487 | } |
39263d5e | 488 | sb_end_pagefault(inode->i_sb); |
13d921e3 | 489 | return block_page_mkwrite_return(ret); |
3cc3f710 SW |
490 | } |
491 | ||
f0f37e2f | 492 | static const struct vm_operations_struct gfs2_vm_ops = { |
3cc3f710 SW |
493 | .fault = filemap_fault, |
494 | .page_mkwrite = gfs2_page_mkwrite, | |
0b173bc4 | 495 | .remap_pages = generic_file_remap_pages, |
3cc3f710 SW |
496 | }; |
497 | ||
b3b94faa DT |
498 | /** |
499 | * gfs2_mmap - | |
500 | * @file: The file to map | |
501 | * @vma: The VMA which described the mapping | |
502 | * | |
48bf2b17 SW |
503 | * There is no need to get a lock here unless we should be updating |
504 | * atime. We ignore any locking errors since the only consequence is | |
505 | * a missed atime update (which will just be deferred until later). | |
506 | * | |
507 | * Returns: 0 | |
b3b94faa DT |
508 | */ |
509 | ||
510 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
511 | { | |
feaa7bba | 512 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa | 513 | |
b9c93bb7 SW |
514 | if (!(file->f_flags & O_NOATIME) && |
515 | !IS_NOATIME(&ip->i_inode)) { | |
48bf2b17 SW |
516 | struct gfs2_holder i_gh; |
517 | int error; | |
b3b94faa | 518 | |
3d162688 BM |
519 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
520 | &i_gh); | |
b9c93bb7 SW |
521 | if (error) |
522 | return error; | |
3d162688 BM |
523 | /* grab lock to update inode */ |
524 | gfs2_glock_dq_uninit(&i_gh); | |
525 | file_accessed(file); | |
48bf2b17 | 526 | } |
3cc3f710 | 527 | vma->vm_ops = &gfs2_vm_ops; |
b3b94faa | 528 | |
48bf2b17 | 529 | return 0; |
b3b94faa DT |
530 | } |
531 | ||
532 | /** | |
533 | * gfs2_open - open a file | |
534 | * @inode: the inode to open | |
535 | * @file: the struct file for this opening | |
536 | * | |
537 | * Returns: errno | |
538 | */ | |
539 | ||
540 | static int gfs2_open(struct inode *inode, struct file *file) | |
541 | { | |
feaa7bba | 542 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
543 | struct gfs2_holder i_gh; |
544 | struct gfs2_file *fp; | |
545 | int error; | |
546 | ||
b3b94faa DT |
547 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
548 | if (!fp) | |
549 | return -ENOMEM; | |
550 | ||
f55ab26a | 551 | mutex_init(&fp->f_fl_mutex); |
b3b94faa | 552 | |
feaa7bba | 553 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
5c676f6d | 554 | file->private_data = fp; |
b3b94faa | 555 | |
b60623c2 | 556 | if (S_ISREG(ip->i_inode.i_mode)) { |
b3b94faa DT |
557 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
558 | &i_gh); | |
559 | if (error) | |
560 | goto fail; | |
561 | ||
562 | if (!(file->f_flags & O_LARGEFILE) && | |
a2e0f799 | 563 | i_size_read(inode) > MAX_NON_LFS) { |
a9c62a18 | 564 | error = -EOVERFLOW; |
b3b94faa DT |
565 | goto fail_gunlock; |
566 | } | |
567 | ||
b3b94faa DT |
568 | gfs2_glock_dq_uninit(&i_gh); |
569 | } | |
570 | ||
571 | return 0; | |
572 | ||
420b9e5e | 573 | fail_gunlock: |
b3b94faa | 574 | gfs2_glock_dq_uninit(&i_gh); |
420b9e5e | 575 | fail: |
5c676f6d | 576 | file->private_data = NULL; |
b3b94faa | 577 | kfree(fp); |
b3b94faa DT |
578 | return error; |
579 | } | |
580 | ||
581 | /** | |
df3fd117 | 582 | * gfs2_release - called to close a struct file |
b3b94faa DT |
583 | * @inode: the inode the struct file belongs to |
584 | * @file: the struct file being closed | |
585 | * | |
586 | * Returns: errno | |
587 | */ | |
588 | ||
df3fd117 | 589 | static int gfs2_release(struct inode *inode, struct file *file) |
b3b94faa | 590 | { |
0a305e49 | 591 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 592 | |
8e2e0047 | 593 | kfree(file->private_data); |
5c676f6d | 594 | file->private_data = NULL; |
b3b94faa | 595 | |
8e2e0047 | 596 | if ((file->f_mode & FMODE_WRITE) && |
0a305e49 BP |
597 | (atomic_read(&inode->i_writecount) == 1)) |
598 | gfs2_rs_delete(ip); | |
599 | ||
b3b94faa DT |
600 | return 0; |
601 | } | |
602 | ||
603 | /** | |
604 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
02c24a82 JB |
605 | * @file: the file that points to the dentry |
606 | * @start: the start position in the file to sync | |
607 | * @end: the end position in the file to sync | |
dba898b0 | 608 | * @datasync: set if we can ignore timestamp changes |
b3b94faa | 609 | * |
2f0264d5 SW |
610 | * We split the data flushing here so that we don't wait for the data |
611 | * until after we've also sent the metadata to disk. Note that for | |
612 | * data=ordered, we will write & wait for the data at the log flush | |
613 | * stage anyway, so this is unlikely to make much of a difference | |
614 | * except in the data=writeback case. | |
615 | * | |
616 | * If the fdatawrite fails due to any reason except -EIO, we will | |
617 | * continue the remainder of the fsync, although we'll still report | |
618 | * the error at the end. This is to match filemap_write_and_wait_range() | |
619 | * behaviour. | |
34126f9f | 620 | * |
b3b94faa DT |
621 | * Returns: errno |
622 | */ | |
623 | ||
02c24a82 JB |
624 | static int gfs2_fsync(struct file *file, loff_t start, loff_t end, |
625 | int datasync) | |
b3b94faa | 626 | { |
2f0264d5 SW |
627 | struct address_space *mapping = file->f_mapping; |
628 | struct inode *inode = mapping->host; | |
33c3de32 | 629 | int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); |
dba898b0 | 630 | struct gfs2_inode *ip = GFS2_I(inode); |
87654896 | 631 | int ret = 0, ret1 = 0; |
b3b94faa | 632 | |
2f0264d5 SW |
633 | if (mapping->nrpages) { |
634 | ret1 = filemap_fdatawrite_range(mapping, start, end); | |
635 | if (ret1 == -EIO) | |
636 | return ret1; | |
637 | } | |
02c24a82 | 638 | |
dba898b0 SW |
639 | if (datasync) |
640 | sync_state &= ~I_DIRTY_SYNC; | |
b3b94faa | 641 | |
dba898b0 SW |
642 | if (sync_state) { |
643 | ret = sync_inode_metadata(inode, 1); | |
b5b24d7a | 644 | if (ret) |
dba898b0 | 645 | return ret; |
f1818529 SW |
646 | if (gfs2_is_jdata(ip)) |
647 | filemap_write_and_wait(mapping); | |
b5b24d7a | 648 | gfs2_ail_flush(ip->i_gl, 1); |
33c3de32 SW |
649 | } |
650 | ||
2f0264d5 SW |
651 | if (mapping->nrpages) |
652 | ret = filemap_fdatawait_range(mapping, start, end); | |
653 | ||
654 | return ret ? ret : ret1; | |
b3b94faa DT |
655 | } |
656 | ||
56aa616a SW |
657 | /** |
658 | * gfs2_file_aio_write - Perform a write to a file | |
659 | * @iocb: The io context | |
660 | * @iov: The data to write | |
661 | * @nr_segs: Number of @iov segments | |
662 | * @pos: The file position | |
663 | * | |
664 | * We have to do a lock/unlock here to refresh the inode size for | |
665 | * O_APPEND writes, otherwise we can land up writing at the wrong | |
666 | * offset. There is still a race, but provided the app is using its | |
667 | * own file locking, this will make O_APPEND work as expected. | |
668 | * | |
669 | */ | |
670 | ||
671 | static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
672 | unsigned long nr_segs, loff_t pos) | |
673 | { | |
674 | struct file *file = iocb->ki_filp; | |
8e2e0047 | 675 | size_t writesize = iov_length(iov, nr_segs); |
0a305e49 BP |
676 | struct dentry *dentry = file->f_dentry; |
677 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); | |
678 | int ret; | |
679 | ||
680 | ret = gfs2_rs_alloc(ip); | |
681 | if (ret) | |
682 | return ret; | |
56aa616a | 683 | |
da1dfb6a SW |
684 | gfs2_size_hint(file, pos, writesize); |
685 | ||
56aa616a | 686 | if (file->f_flags & O_APPEND) { |
56aa616a | 687 | struct gfs2_holder gh; |
56aa616a SW |
688 | |
689 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
690 | if (ret) | |
691 | return ret; | |
692 | gfs2_glock_dq_uninit(&gh); | |
693 | } | |
694 | ||
695 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
696 | } | |
697 | ||
2fe17c10 CH |
698 | static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len, |
699 | int mode) | |
700 | { | |
701 | struct gfs2_inode *ip = GFS2_I(inode); | |
702 | struct buffer_head *dibh; | |
703 | int error; | |
58a7d5fb | 704 | loff_t size = len; |
64dd153c BM |
705 | unsigned int nr_blks; |
706 | sector_t lblock = offset >> inode->i_blkbits; | |
2fe17c10 CH |
707 | |
708 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
709 | if (unlikely(error)) | |
64dd153c | 710 | return error; |
2fe17c10 CH |
711 | |
712 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
713 | ||
714 | if (gfs2_is_stuffed(ip)) { | |
715 | error = gfs2_unstuff_dinode(ip, NULL); | |
716 | if (unlikely(error)) | |
717 | goto out; | |
718 | } | |
719 | ||
64dd153c BM |
720 | while (len) { |
721 | struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; | |
722 | bh_map.b_size = len; | |
723 | set_buffer_zeronew(&bh_map); | |
2fe17c10 | 724 | |
64dd153c BM |
725 | error = gfs2_block_map(inode, lblock, &bh_map, 1); |
726 | if (unlikely(error)) | |
727 | goto out; | |
728 | len -= bh_map.b_size; | |
729 | nr_blks = bh_map.b_size >> inode->i_blkbits; | |
730 | lblock += nr_blks; | |
731 | if (!buffer_new(&bh_map)) | |
732 | continue; | |
733 | if (unlikely(!buffer_zeronew(&bh_map))) { | |
734 | error = -EIO; | |
2fe17c10 | 735 | goto out; |
64dd153c | 736 | } |
2fe17c10 | 737 | } |
58a7d5fb BM |
738 | if (offset + size > inode->i_size && !(mode & FALLOC_FL_KEEP_SIZE)) |
739 | i_size_write(inode, offset + size); | |
2fe17c10 | 740 | |
2fe17c10 CH |
741 | mark_inode_dirty(inode); |
742 | ||
2fe17c10 | 743 | out: |
64dd153c | 744 | brelse(dibh); |
2fe17c10 CH |
745 | return error; |
746 | } | |
747 | ||
748 | static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len, | |
749 | unsigned int *data_blocks, unsigned int *ind_blocks) | |
750 | { | |
751 | const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); | |
54335b1f | 752 | unsigned int max_blocks = ip->i_rgd->rd_free_clone; |
2fe17c10 CH |
753 | unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1); |
754 | ||
755 | for (tmp = max_data; tmp > sdp->sd_diptrs;) { | |
756 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); | |
757 | max_data -= tmp; | |
758 | } | |
759 | /* This calculation isn't the exact reverse of gfs2_write_calc_reserve, | |
760 | so it might end up with fewer data blocks */ | |
761 | if (max_data <= *data_blocks) | |
762 | return; | |
763 | *data_blocks = max_data; | |
764 | *ind_blocks = max_blocks - max_data; | |
765 | *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift; | |
766 | if (*len > max) { | |
767 | *len = max; | |
768 | gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks); | |
769 | } | |
770 | } | |
771 | ||
772 | static long gfs2_fallocate(struct file *file, int mode, loff_t offset, | |
773 | loff_t len) | |
774 | { | |
775 | struct inode *inode = file->f_path.dentry->d_inode; | |
776 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
777 | struct gfs2_inode *ip = GFS2_I(inode); | |
778 | unsigned int data_blocks = 0, ind_blocks = 0, rblocks; | |
779 | loff_t bytes, max_bytes; | |
2fe17c10 | 780 | int error; |
4442f2e0 SW |
781 | const loff_t pos = offset; |
782 | const loff_t count = len; | |
6905d9e4 | 783 | loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1); |
2fe17c10 | 784 | loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift; |
64dd153c | 785 | loff_t max_chunk_size = UINT_MAX & bsize_mask; |
2fe17c10 CH |
786 | next = (next + 1) << sdp->sd_sb.sb_bsize_shift; |
787 | ||
788 | /* We only support the FALLOC_FL_KEEP_SIZE mode */ | |
789 | if (mode & ~FALLOC_FL_KEEP_SIZE) | |
790 | return -EOPNOTSUPP; | |
791 | ||
6905d9e4 | 792 | offset &= bsize_mask; |
2fe17c10 CH |
793 | |
794 | len = next - offset; | |
795 | bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2; | |
796 | if (!bytes) | |
797 | bytes = UINT_MAX; | |
6905d9e4 BM |
798 | bytes &= bsize_mask; |
799 | if (bytes == 0) | |
800 | bytes = sdp->sd_sb.sb_bsize; | |
2fe17c10 | 801 | |
0a305e49 BP |
802 | error = gfs2_rs_alloc(ip); |
803 | if (error) | |
804 | return error; | |
805 | ||
2fe17c10 CH |
806 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); |
807 | error = gfs2_glock_nq(&ip->i_gh); | |
808 | if (unlikely(error)) | |
809 | goto out_uninit; | |
810 | ||
da1dfb6a | 811 | gfs2_size_hint(file, offset, len); |
8e2e0047 | 812 | |
2fe17c10 CH |
813 | while (len > 0) { |
814 | if (len < bytes) | |
815 | bytes = len; | |
58a7d5fb BM |
816 | if (!gfs2_write_alloc_required(ip, offset, bytes)) { |
817 | len -= bytes; | |
818 | offset += bytes; | |
819 | continue; | |
820 | } | |
2fe17c10 CH |
821 | error = gfs2_quota_lock_check(ip); |
822 | if (error) | |
5407e242 | 823 | goto out_unlock; |
2fe17c10 CH |
824 | |
825 | retry: | |
826 | gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks); | |
827 | ||
9dbe9610 | 828 | error = gfs2_inplace_reserve(ip, data_blocks + ind_blocks, 0); |
2fe17c10 CH |
829 | if (error) { |
830 | if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) { | |
831 | bytes >>= 1; | |
6905d9e4 BM |
832 | bytes &= bsize_mask; |
833 | if (bytes == 0) | |
834 | bytes = sdp->sd_sb.sb_bsize; | |
2fe17c10 CH |
835 | goto retry; |
836 | } | |
837 | goto out_qunlock; | |
838 | } | |
839 | max_bytes = bytes; | |
64dd153c BM |
840 | calc_max_reserv(ip, (len > max_chunk_size)? max_chunk_size: len, |
841 | &max_bytes, &data_blocks, &ind_blocks); | |
2fe17c10 CH |
842 | |
843 | rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA + | |
71f890f7 | 844 | RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks); |
2fe17c10 CH |
845 | if (gfs2_is_jdata(ip)) |
846 | rblocks += data_blocks ? data_blocks : 1; | |
847 | ||
848 | error = gfs2_trans_begin(sdp, rblocks, | |
849 | PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); | |
850 | if (error) | |
851 | goto out_trans_fail; | |
852 | ||
853 | error = fallocate_chunk(inode, offset, max_bytes, mode); | |
854 | gfs2_trans_end(sdp); | |
855 | ||
856 | if (error) | |
857 | goto out_trans_fail; | |
858 | ||
859 | len -= max_bytes; | |
860 | offset += max_bytes; | |
861 | gfs2_inplace_release(ip); | |
862 | gfs2_quota_unlock(ip); | |
2fe17c10 | 863 | } |
4442f2e0 SW |
864 | |
865 | if (error == 0) | |
866 | error = generic_write_sync(file, pos, count); | |
2fe17c10 CH |
867 | goto out_unlock; |
868 | ||
869 | out_trans_fail: | |
870 | gfs2_inplace_release(ip); | |
871 | out_qunlock: | |
872 | gfs2_quota_unlock(ip); | |
2fe17c10 CH |
873 | out_unlock: |
874 | gfs2_glock_dq(&ip->i_gh); | |
875 | out_uninit: | |
876 | gfs2_holder_uninit(&ip->i_gh); | |
877 | return error; | |
878 | } | |
879 | ||
f057f6cd SW |
880 | #ifdef CONFIG_GFS2_FS_LOCKING_DLM |
881 | ||
60446067 ME |
882 | /** |
883 | * gfs2_setlease - acquire/release a file lease | |
884 | * @file: the file pointer | |
885 | * @arg: lease type | |
886 | * @fl: file lock | |
887 | * | |
f057f6cd SW |
888 | * We don't currently have a way to enforce a lease across the whole |
889 | * cluster; until we do, disable leases (by just returning -EINVAL), | |
890 | * unless the administrator has requested purely local locking. | |
891 | * | |
b89f4321 AB |
892 | * Locking: called under lock_flocks |
893 | * | |
60446067 ME |
894 | * Returns: errno |
895 | */ | |
896 | ||
897 | static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) | |
898 | { | |
f057f6cd | 899 | return -EINVAL; |
da755fdb SW |
900 | } |
901 | ||
b3b94faa DT |
902 | /** |
903 | * gfs2_lock - acquire/release a posix lock on a file | |
904 | * @file: the file pointer | |
905 | * @cmd: either modify or retrieve lock state, possibly wait | |
906 | * @fl: type and range of lock | |
907 | * | |
908 | * Returns: errno | |
909 | */ | |
910 | ||
911 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
912 | { | |
feaa7bba SW |
913 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
914 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
f057f6cd | 915 | struct lm_lockstruct *ls = &sdp->sd_lockstruct; |
b3b94faa | 916 | |
b3b94faa DT |
917 | if (!(fl->fl_flags & FL_POSIX)) |
918 | return -ENOLCK; | |
720e7749 | 919 | if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK) |
b3b94faa DT |
920 | return -ENOLCK; |
921 | ||
586759f0 ME |
922 | if (cmd == F_CANCELLK) { |
923 | /* Hack: */ | |
924 | cmd = F_SETLK; | |
925 | fl->fl_type = F_UNLCK; | |
926 | } | |
f057f6cd SW |
927 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
928 | return -EIO; | |
b3b94faa | 929 | if (IS_GETLK(cmd)) |
f057f6cd | 930 | return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); |
b3b94faa | 931 | else if (fl->fl_type == F_UNLCK) |
f057f6cd | 932 | return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); |
b3b94faa | 933 | else |
f057f6cd | 934 | return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); |
b3b94faa DT |
935 | } |
936 | ||
b3b94faa DT |
937 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
938 | { | |
5c676f6d | 939 | struct gfs2_file *fp = file->private_data; |
b3b94faa | 940 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
81454098 | 941 | struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); |
b3b94faa DT |
942 | struct gfs2_glock *gl; |
943 | unsigned int state; | |
944 | int flags; | |
945 | int error = 0; | |
946 | ||
947 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
6802e340 | 948 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; |
b3b94faa | 949 | |
f55ab26a | 950 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
951 | |
952 | gl = fl_gh->gh_gl; | |
953 | if (gl) { | |
954 | if (fl_gh->gh_state == state) | |
955 | goto out; | |
b3b94faa | 956 | flock_lock_file_wait(file, |
907b9bce | 957 | &(struct file_lock){.fl_type = F_UNLCK}); |
b4c20166 AD |
958 | gfs2_glock_dq_wait(fl_gh); |
959 | gfs2_holder_reinit(state, flags, fl_gh); | |
b3b94faa | 960 | } else { |
6802e340 SW |
961 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, |
962 | &gfs2_flock_glops, CREATE, &gl); | |
b3b94faa DT |
963 | if (error) |
964 | goto out; | |
b4c20166 AD |
965 | gfs2_holder_init(gl, state, flags, fl_gh); |
966 | gfs2_glock_put(gl); | |
b3b94faa | 967 | } |
b3b94faa DT |
968 | error = gfs2_glock_nq(fl_gh); |
969 | if (error) { | |
970 | gfs2_holder_uninit(fl_gh); | |
971 | if (error == GLR_TRYFAILED) | |
972 | error = -EAGAIN; | |
973 | } else { | |
974 | error = flock_lock_file_wait(file, fl); | |
feaa7bba | 975 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
b3b94faa DT |
976 | } |
977 | ||
420b9e5e | 978 | out: |
f55ab26a | 979 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
980 | return error; |
981 | } | |
982 | ||
983 | static void do_unflock(struct file *file, struct file_lock *fl) | |
984 | { | |
5c676f6d | 985 | struct gfs2_file *fp = file->private_data; |
b3b94faa DT |
986 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
987 | ||
f55ab26a | 988 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa | 989 | flock_lock_file_wait(file, fl); |
0a33443b SW |
990 | if (fl_gh->gh_gl) { |
991 | gfs2_glock_dq_wait(fl_gh); | |
992 | gfs2_holder_uninit(fl_gh); | |
993 | } | |
f55ab26a | 994 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
995 | } |
996 | ||
997 | /** | |
998 | * gfs2_flock - acquire/release a flock lock on a file | |
999 | * @file: the file pointer | |
1000 | * @cmd: either modify or retrieve lock state, possibly wait | |
1001 | * @fl: type and range of lock | |
1002 | * | |
1003 | * Returns: errno | |
1004 | */ | |
1005 | ||
1006 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
1007 | { | |
b3b94faa DT |
1008 | if (!(fl->fl_flags & FL_FLOCK)) |
1009 | return -ENOLCK; | |
a12af1eb AD |
1010 | if (fl->fl_type & LOCK_MAND) |
1011 | return -EOPNOTSUPP; | |
b3b94faa | 1012 | |
b3b94faa DT |
1013 | if (fl->fl_type == F_UNLCK) { |
1014 | do_unflock(file, fl); | |
1015 | return 0; | |
d00223f1 | 1016 | } else { |
b3b94faa | 1017 | return do_flock(file, cmd, fl); |
d00223f1 | 1018 | } |
b3b94faa DT |
1019 | } |
1020 | ||
10d21988 | 1021 | const struct file_operations gfs2_file_fops = { |
26c1a574 | 1022 | .llseek = gfs2_llseek, |
d00223f1 | 1023 | .read = do_sync_read, |
26c1a574 | 1024 | .aio_read = generic_file_aio_read, |
d00223f1 | 1025 | .write = do_sync_write, |
56aa616a | 1026 | .aio_write = gfs2_file_aio_write, |
26c1a574 SW |
1027 | .unlocked_ioctl = gfs2_ioctl, |
1028 | .mmap = gfs2_mmap, | |
1029 | .open = gfs2_open, | |
df3fd117 | 1030 | .release = gfs2_release, |
26c1a574 SW |
1031 | .fsync = gfs2_fsync, |
1032 | .lock = gfs2_lock, | |
26c1a574 SW |
1033 | .flock = gfs2_flock, |
1034 | .splice_read = generic_file_splice_read, | |
1035 | .splice_write = generic_file_splice_write, | |
60446067 | 1036 | .setlease = gfs2_setlease, |
2fe17c10 | 1037 | .fallocate = gfs2_fallocate, |
b3b94faa DT |
1038 | }; |
1039 | ||
10d21988 | 1040 | const struct file_operations gfs2_dir_fops = { |
26c1a574 SW |
1041 | .readdir = gfs2_readdir, |
1042 | .unlocked_ioctl = gfs2_ioctl, | |
1043 | .open = gfs2_open, | |
df3fd117 | 1044 | .release = gfs2_release, |
26c1a574 SW |
1045 | .fsync = gfs2_fsync, |
1046 | .lock = gfs2_lock, | |
1047 | .flock = gfs2_flock, | |
6038f373 | 1048 | .llseek = default_llseek, |
b3b94faa DT |
1049 | }; |
1050 | ||
f057f6cd SW |
1051 | #endif /* CONFIG_GFS2_FS_LOCKING_DLM */ |
1052 | ||
10d21988 | 1053 | const struct file_operations gfs2_file_fops_nolock = { |
c97bfe43 WC |
1054 | .llseek = gfs2_llseek, |
1055 | .read = do_sync_read, | |
1056 | .aio_read = generic_file_aio_read, | |
1057 | .write = do_sync_write, | |
56aa616a | 1058 | .aio_write = gfs2_file_aio_write, |
c97bfe43 WC |
1059 | .unlocked_ioctl = gfs2_ioctl, |
1060 | .mmap = gfs2_mmap, | |
1061 | .open = gfs2_open, | |
df3fd117 | 1062 | .release = gfs2_release, |
c97bfe43 WC |
1063 | .fsync = gfs2_fsync, |
1064 | .splice_read = generic_file_splice_read, | |
1065 | .splice_write = generic_file_splice_write, | |
f057f6cd | 1066 | .setlease = generic_setlease, |
2fe17c10 | 1067 | .fallocate = gfs2_fallocate, |
c97bfe43 WC |
1068 | }; |
1069 | ||
10d21988 | 1070 | const struct file_operations gfs2_dir_fops_nolock = { |
c97bfe43 WC |
1071 | .readdir = gfs2_readdir, |
1072 | .unlocked_ioctl = gfs2_ioctl, | |
1073 | .open = gfs2_open, | |
df3fd117 | 1074 | .release = gfs2_release, |
c97bfe43 | 1075 | .fsync = gfs2_fsync, |
6038f373 | 1076 | .llseek = default_llseek, |
c97bfe43 WC |
1077 | }; |
1078 |