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> |
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> | |
a27bb332 | 28 | #include <linux/aio.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 | |
965c8e59 | 48 | * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) |
b3b94faa DT |
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 | ||
965c8e59 | 56 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence) |
b3b94faa | 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 | ||
965c8e59 | 62 | switch (whence) { |
9453615a SW |
63 | case SEEK_END: /* These reference inode->i_size */ |
64 | case SEEK_DATA: | |
65 | case SEEK_HOLE: | |
b3b94faa DT |
66 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
67 | &i_gh); | |
68 | if (!error) { | |
965c8e59 | 69 | error = generic_file_llseek(file, offset, whence); |
b3b94faa DT |
70 | gfs2_glock_dq_uninit(&i_gh); |
71 | } | |
9453615a SW |
72 | break; |
73 | case SEEK_CUR: | |
74 | case SEEK_SET: | |
965c8e59 | 75 | error = generic_file_llseek(file, offset, whence); |
9453615a SW |
76 | break; |
77 | default: | |
78 | error = -EINVAL; | |
79 | } | |
b3b94faa DT |
80 | |
81 | return error; | |
82 | } | |
83 | ||
b3b94faa | 84 | /** |
f0e522a9 | 85 | * gfs2_readdir - Read directory entries from a directory |
b3b94faa DT |
86 | * @file: The directory to read from |
87 | * @dirent: Buffer for dirents | |
88 | * @filldir: Function used to do the copying | |
89 | * | |
90 | * Returns: errno | |
91 | */ | |
92 | ||
f0e522a9 | 93 | static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) |
b3b94faa | 94 | { |
71b86f56 | 95 | struct inode *dir = file->f_mapping->host; |
feaa7bba | 96 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 97 | struct gfs2_holder d_gh; |
cd915493 | 98 | u64 offset = file->f_pos; |
b3b94faa DT |
99 | int error; |
100 | ||
719ee344 SW |
101 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
102 | error = gfs2_glock_nq(&d_gh); | |
b3b94faa DT |
103 | if (error) { |
104 | gfs2_holder_uninit(&d_gh); | |
105 | return error; | |
106 | } | |
107 | ||
dfe4d34b | 108 | error = gfs2_dir_read(dir, &offset, dirent, filldir, &file->f_ra); |
b3b94faa DT |
109 | |
110 | gfs2_glock_dq_uninit(&d_gh); | |
111 | ||
b3b94faa DT |
112 | file->f_pos = offset; |
113 | ||
b3b94faa DT |
114 | return error; |
115 | } | |
116 | ||
128e5eba SW |
117 | /** |
118 | * fsflags_cvt | |
119 | * @table: A table of 32 u32 flags | |
120 | * @val: a 32 bit value to convert | |
121 | * | |
122 | * This function can be used to convert between fsflags values and | |
123 | * GFS2's own flags values. | |
124 | * | |
125 | * Returns: the converted flags | |
126 | */ | |
127 | static u32 fsflags_cvt(const u32 *table, u32 val) | |
128 | { | |
129 | u32 res = 0; | |
130 | while(val) { | |
131 | if (val & 1) | |
132 | res |= *table; | |
133 | table++; | |
134 | val >>= 1; | |
135 | } | |
136 | return res; | |
137 | } | |
b3b94faa | 138 | |
128e5eba SW |
139 | static const u32 fsflags_to_gfs2[32] = { |
140 | [3] = GFS2_DIF_SYNC, | |
141 | [4] = GFS2_DIF_IMMUTABLE, | |
142 | [5] = GFS2_DIF_APPENDONLY, | |
143 | [7] = GFS2_DIF_NOATIME, | |
144 | [12] = GFS2_DIF_EXHASH, | |
b9af7ca6 | 145 | [14] = GFS2_DIF_INHERIT_JDATA, |
23d0bb83 | 146 | [17] = GFS2_DIF_TOPDIR, |
71b86f56 SW |
147 | }; |
148 | ||
128e5eba SW |
149 | static const u32 gfs2_to_fsflags[32] = { |
150 | [gfs2fl_Sync] = FS_SYNC_FL, | |
151 | [gfs2fl_Immutable] = FS_IMMUTABLE_FL, | |
152 | [gfs2fl_AppendOnly] = FS_APPEND_FL, | |
153 | [gfs2fl_NoAtime] = FS_NOATIME_FL, | |
154 | [gfs2fl_ExHash] = FS_INDEX_FL, | |
23d0bb83 | 155 | [gfs2fl_TopLevel] = FS_TOPDIR_FL, |
128e5eba | 156 | [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, |
7ea9ea83 | 157 | }; |
71b86f56 | 158 | |
b09e593d | 159 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 160 | { |
496ad9aa | 161 | struct inode *inode = file_inode(filp); |
feaa7bba | 162 | struct gfs2_inode *ip = GFS2_I(inode); |
71b86f56 SW |
163 | struct gfs2_holder gh; |
164 | int error; | |
128e5eba | 165 | u32 fsflags; |
71b86f56 | 166 | |
719ee344 SW |
167 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
168 | error = gfs2_glock_nq(&gh); | |
71b86f56 SW |
169 | if (error) |
170 | return error; | |
907b9bce | 171 | |
383f01fb SW |
172 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags); |
173 | if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA) | |
c9f6a6bb | 174 | fsflags |= FS_JOURNAL_DATA_FL; |
128e5eba | 175 | if (put_user(fsflags, ptr)) |
71b86f56 SW |
176 | error = -EFAULT; |
177 | ||
3cc3f710 | 178 | gfs2_glock_dq(&gh); |
71b86f56 SW |
179 | gfs2_holder_uninit(&gh); |
180 | return error; | |
181 | } | |
182 | ||
6b124d8d SW |
183 | void gfs2_set_inode_flags(struct inode *inode) |
184 | { | |
185 | struct gfs2_inode *ip = GFS2_I(inode); | |
6b124d8d SW |
186 | unsigned int flags = inode->i_flags; |
187 | ||
9964afbb SW |
188 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC); |
189 | if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode)) | |
190 | inode->i_flags |= S_NOSEC; | |
383f01fb | 191 | if (ip->i_diskflags & GFS2_DIF_IMMUTABLE) |
6b124d8d | 192 | flags |= S_IMMUTABLE; |
383f01fb | 193 | if (ip->i_diskflags & GFS2_DIF_APPENDONLY) |
6b124d8d | 194 | flags |= S_APPEND; |
383f01fb | 195 | if (ip->i_diskflags & GFS2_DIF_NOATIME) |
6b124d8d | 196 | flags |= S_NOATIME; |
383f01fb | 197 | if (ip->i_diskflags & GFS2_DIF_SYNC) |
6b124d8d SW |
198 | flags |= S_SYNC; |
199 | inode->i_flags = flags; | |
200 | } | |
201 | ||
71b86f56 SW |
202 | /* Flags that can be set by user space */ |
203 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
71b86f56 SW |
204 | GFS2_DIF_IMMUTABLE| \ |
205 | GFS2_DIF_APPENDONLY| \ | |
206 | GFS2_DIF_NOATIME| \ | |
207 | GFS2_DIF_SYNC| \ | |
208 | GFS2_DIF_SYSTEM| \ | |
23d0bb83 | 209 | GFS2_DIF_TOPDIR| \ |
71b86f56 SW |
210 | GFS2_DIF_INHERIT_JDATA) |
211 | ||
212 | /** | |
213 | * gfs2_set_flags - set flags on an inode | |
214 | * @inode: The inode | |
215 | * @flags: The flags to set | |
216 | * @mask: Indicates which flags are valid | |
217 | * | |
218 | */ | |
b09e593d | 219 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
71b86f56 | 220 | { |
496ad9aa | 221 | struct inode *inode = file_inode(filp); |
feaa7bba SW |
222 | struct gfs2_inode *ip = GFS2_I(inode); |
223 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
71b86f56 SW |
224 | struct buffer_head *bh; |
225 | struct gfs2_holder gh; | |
226 | int error; | |
55eccc6d | 227 | u32 new_flags, flags; |
71b86f56 | 228 | |
a561be71 | 229 | error = mnt_want_write_file(filp); |
52f341cf | 230 | if (error) |
71b86f56 SW |
231 | return error; |
232 | ||
f58ba889 MS |
233 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
234 | if (error) | |
235 | goto out_drop_write; | |
236 | ||
7df0e039 | 237 | error = -EACCES; |
2e149670 | 238 | if (!inode_owner_or_capable(inode)) |
7df0e039 SW |
239 | goto out; |
240 | ||
241 | error = 0; | |
383f01fb | 242 | flags = ip->i_diskflags; |
55eccc6d | 243 | new_flags = (flags & ~mask) | (reqflags & mask); |
71b86f56 SW |
244 | if ((new_flags ^ flags) == 0) |
245 | goto out; | |
246 | ||
247 | error = -EINVAL; | |
248 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) | |
249 | goto out; | |
250 | ||
71b86f56 SW |
251 | error = -EPERM; |
252 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
253 | goto out; | |
254 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
255 | goto out; | |
907b9bce | 256 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
b9cb9813 | 257 | !capable(CAP_LINUX_IMMUTABLE)) |
71b86f56 | 258 | goto out; |
b9cb9813 | 259 | if (!IS_IMMUTABLE(inode)) { |
10556cb2 | 260 | error = gfs2_permission(inode, MAY_WRITE); |
b9cb9813 SW |
261 | if (error) |
262 | goto out; | |
263 | } | |
5561093e SW |
264 | if ((flags ^ new_flags) & GFS2_DIF_JDATA) { |
265 | if (flags & GFS2_DIF_JDATA) | |
266 | gfs2_log_flush(sdp, ip->i_gl); | |
267 | error = filemap_fdatawrite(inode->i_mapping); | |
268 | if (error) | |
269 | goto out; | |
270 | error = filemap_fdatawait(inode->i_mapping); | |
271 | if (error) | |
272 | goto out; | |
273 | } | |
55eccc6d | 274 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
71b86f56 SW |
275 | if (error) |
276 | goto out; | |
55eccc6d SW |
277 | error = gfs2_meta_inode_buffer(ip, &bh); |
278 | if (error) | |
279 | goto out_trans_end; | |
350a9b0a | 280 | gfs2_trans_add_meta(ip->i_gl, bh); |
383f01fb | 281 | ip->i_diskflags = new_flags; |
539e5d6b | 282 | gfs2_dinode_out(ip, bh->b_data); |
71b86f56 | 283 | brelse(bh); |
6b124d8d | 284 | gfs2_set_inode_flags(inode); |
5561093e | 285 | gfs2_set_aops(inode); |
55eccc6d SW |
286 | out_trans_end: |
287 | gfs2_trans_end(sdp); | |
71b86f56 SW |
288 | out: |
289 | gfs2_glock_dq_uninit(&gh); | |
f58ba889 | 290 | out_drop_write: |
2a79f17e | 291 | mnt_drop_write_file(filp); |
71b86f56 SW |
292 | return error; |
293 | } | |
294 | ||
b09e593d | 295 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 296 | { |
496ad9aa | 297 | struct inode *inode = file_inode(filp); |
128e5eba | 298 | u32 fsflags, gfsflags; |
7df0e039 | 299 | |
128e5eba | 300 | if (get_user(fsflags, ptr)) |
71b86f56 | 301 | return -EFAULT; |
7df0e039 | 302 | |
128e5eba | 303 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); |
b9af7ca6 | 304 | if (!S_ISDIR(inode->i_mode)) { |
23d0bb83 | 305 | gfsflags &= ~GFS2_DIF_TOPDIR; |
b9af7ca6 SW |
306 | if (gfsflags & GFS2_DIF_INHERIT_JDATA) |
307 | gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); | |
b9af7ca6 SW |
308 | return do_gfs2_set_flags(filp, gfsflags, ~0); |
309 | } | |
310 | return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); | |
71b86f56 SW |
311 | } |
312 | ||
b09e593d | 313 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
71b86f56 SW |
314 | { |
315 | switch(cmd) { | |
128e5eba | 316 | case FS_IOC_GETFLAGS: |
b09e593d | 317 | return gfs2_get_flags(filp, (u32 __user *)arg); |
128e5eba | 318 | case FS_IOC_SETFLAGS: |
b09e593d | 319 | return gfs2_set_flags(filp, (u32 __user *)arg); |
66fc061b SW |
320 | case FITRIM: |
321 | return gfs2_fitrim(filp, (void __user *)arg); | |
71b86f56 SW |
322 | } |
323 | return -ENOTTY; | |
324 | } | |
325 | ||
da1dfb6a SW |
326 | /** |
327 | * gfs2_size_hint - Give a hint to the size of a write request | |
328 | * @file: The struct file | |
329 | * @offset: The file offset of the write | |
330 | * @size: The length of the write | |
331 | * | |
332 | * When we are about to do a write, this function records the total | |
333 | * write size in order to provide a suitable hint to the lower layers | |
334 | * about how many blocks will be required. | |
335 | * | |
336 | */ | |
337 | ||
338 | static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size) | |
339 | { | |
496ad9aa | 340 | struct inode *inode = file_inode(filep); |
da1dfb6a SW |
341 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
342 | struct gfs2_inode *ip = GFS2_I(inode); | |
343 | size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift; | |
344 | int hint = min_t(size_t, INT_MAX, blks); | |
345 | ||
346 | atomic_set(&ip->i_res->rs_sizehint, hint); | |
347 | } | |
348 | ||
3cc3f710 SW |
349 | /** |
350 | * gfs2_allocate_page_backing - Use bmap to allocate blocks | |
351 | * @page: The (locked) page to allocate backing for | |
352 | * | |
353 | * We try to allocate all the blocks required for the page in | |
354 | * one go. This might fail for various reasons, so we keep | |
355 | * trying until all the blocks to back this page are allocated. | |
356 | * If some of the blocks are already allocated, thats ok too. | |
357 | */ | |
358 | ||
359 | static int gfs2_allocate_page_backing(struct page *page) | |
360 | { | |
361 | struct inode *inode = page->mapping->host; | |
362 | struct buffer_head bh; | |
363 | unsigned long size = PAGE_CACHE_SIZE; | |
364 | u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
365 | ||
366 | do { | |
367 | bh.b_state = 0; | |
368 | bh.b_size = size; | |
e9e1ef2b | 369 | gfs2_block_map(inode, lblock, &bh, 1); |
3cc3f710 SW |
370 | if (!buffer_mapped(&bh)) |
371 | return -EIO; | |
372 | size -= bh.b_size; | |
373 | lblock += (bh.b_size >> inode->i_blkbits); | |
374 | } while(size > 0); | |
375 | return 0; | |
376 | } | |
377 | ||
378 | /** | |
379 | * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable | |
380 | * @vma: The virtual memory area | |
381 | * @page: The page which is about to become writable | |
382 | * | |
383 | * When the page becomes writable, we need to ensure that we have | |
384 | * blocks allocated on disk to back that page. | |
385 | */ | |
386 | ||
c2ec175c | 387 | static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
3cc3f710 | 388 | { |
c2ec175c | 389 | struct page *page = vmf->page; |
496ad9aa | 390 | struct inode *inode = file_inode(vma->vm_file); |
3cc3f710 SW |
391 | struct gfs2_inode *ip = GFS2_I(inode); |
392 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
393 | unsigned long last_index; | |
c8f554b9 | 394 | u64 pos = page->index << PAGE_CACHE_SHIFT; |
3cc3f710 | 395 | unsigned int data_blocks, ind_blocks, rblocks; |
3cc3f710 | 396 | struct gfs2_holder gh; |
13d921e3 | 397 | loff_t size; |
3cc3f710 SW |
398 | int ret; |
399 | ||
39263d5e | 400 | sb_start_pagefault(inode->i_sb); |
13d921e3 | 401 | |
a63e9b2e JK |
402 | /* Update file times before taking page lock */ |
403 | file_update_time(vma->vm_file); | |
13d921e3 | 404 | |
2b3dcf35 BP |
405 | ret = get_write_access(inode); |
406 | if (ret) | |
407 | goto out; | |
408 | ||
0a305e49 BP |
409 | ret = gfs2_rs_alloc(ip); |
410 | if (ret) | |
2b3dcf35 | 411 | goto out_write_access; |
0a305e49 | 412 | |
da1dfb6a | 413 | gfs2_size_hint(vma->vm_file, pos, PAGE_CACHE_SIZE); |
8e2e0047 | 414 | |
719ee344 SW |
415 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
416 | ret = gfs2_glock_nq(&gh); | |
3cc3f710 | 417 | if (ret) |
2b3dcf35 | 418 | goto out_uninit; |
3cc3f710 | 419 | |
9c538837 SW |
420 | set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); |
421 | set_bit(GIF_SW_PAGED, &ip->i_flags); | |
422 | ||
13d921e3 SW |
423 | if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) { |
424 | lock_page(page); | |
425 | if (!PageUptodate(page) || page->mapping != inode->i_mapping) { | |
426 | ret = -EAGAIN; | |
427 | unlock_page(page); | |
428 | } | |
3cc3f710 | 429 | goto out_unlock; |
13d921e3 SW |
430 | } |
431 | ||
5407e242 BP |
432 | ret = gfs2_rindex_update(sdp); |
433 | if (ret) | |
6dbd8224 SW |
434 | goto out_unlock; |
435 | ||
d82661d9 | 436 | ret = gfs2_quota_lock_check(ip); |
3cc3f710 | 437 | if (ret) |
5407e242 | 438 | goto out_unlock; |
7ed122e4 | 439 | gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); |
9dbe9610 | 440 | ret = gfs2_inplace_reserve(ip, data_blocks + ind_blocks, 0); |
3cc3f710 SW |
441 | if (ret) |
442 | goto out_quota_unlock; | |
443 | ||
444 | rblocks = RES_DINODE + ind_blocks; | |
445 | if (gfs2_is_jdata(ip)) | |
446 | rblocks += data_blocks ? data_blocks : 1; | |
bf97b673 | 447 | if (ind_blocks || data_blocks) { |
3cc3f710 | 448 | rblocks += RES_STATFS + RES_QUOTA; |
71f890f7 | 449 | rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks); |
bf97b673 | 450 | } |
3cc3f710 SW |
451 | ret = gfs2_trans_begin(sdp, rblocks, 0); |
452 | if (ret) | |
453 | goto out_trans_fail; | |
454 | ||
455 | lock_page(page); | |
456 | ret = -EINVAL; | |
13d921e3 SW |
457 | size = i_size_read(inode); |
458 | last_index = (size - 1) >> PAGE_CACHE_SHIFT; | |
459 | /* Check page index against inode size */ | |
460 | if (size == 0 || (page->index > last_index)) | |
461 | goto out_trans_end; | |
462 | ||
463 | ret = -EAGAIN; | |
464 | /* If truncated, we must retry the operation, we may have raced | |
465 | * with the glock demotion code. | |
466 | */ | |
467 | if (!PageUptodate(page) || page->mapping != inode->i_mapping) | |
468 | goto out_trans_end; | |
469 | ||
470 | /* Unstuff, if required, and allocate backing blocks for page */ | |
b7fe2e39 | 471 | ret = 0; |
13d921e3 | 472 | if (gfs2_is_stuffed(ip)) |
3cc3f710 | 473 | ret = gfs2_unstuff_dinode(ip, page); |
13d921e3 SW |
474 | if (ret == 0) |
475 | ret = gfs2_allocate_page_backing(page); | |
3cc3f710 | 476 | |
13d921e3 SW |
477 | out_trans_end: |
478 | if (ret) | |
479 | unlock_page(page); | |
3cc3f710 SW |
480 | gfs2_trans_end(sdp); |
481 | out_trans_fail: | |
482 | gfs2_inplace_release(ip); | |
483 | out_quota_unlock: | |
484 | gfs2_quota_unlock(ip); | |
3cc3f710 SW |
485 | out_unlock: |
486 | gfs2_glock_dq(&gh); | |
2b3dcf35 | 487 | out_uninit: |
3cc3f710 | 488 | gfs2_holder_uninit(&gh); |
13d921e3 SW |
489 | if (ret == 0) { |
490 | set_page_dirty(page); | |
1d1d1a76 | 491 | wait_for_stable_page(page); |
13d921e3 | 492 | } |
2b3dcf35 BP |
493 | out_write_access: |
494 | put_write_access(inode); | |
495 | out: | |
39263d5e | 496 | sb_end_pagefault(inode->i_sb); |
13d921e3 | 497 | return block_page_mkwrite_return(ret); |
3cc3f710 SW |
498 | } |
499 | ||
f0f37e2f | 500 | static const struct vm_operations_struct gfs2_vm_ops = { |
3cc3f710 SW |
501 | .fault = filemap_fault, |
502 | .page_mkwrite = gfs2_page_mkwrite, | |
0b173bc4 | 503 | .remap_pages = generic_file_remap_pages, |
3cc3f710 SW |
504 | }; |
505 | ||
b3b94faa DT |
506 | /** |
507 | * gfs2_mmap - | |
508 | * @file: The file to map | |
509 | * @vma: The VMA which described the mapping | |
510 | * | |
48bf2b17 SW |
511 | * There is no need to get a lock here unless we should be updating |
512 | * atime. We ignore any locking errors since the only consequence is | |
513 | * a missed atime update (which will just be deferred until later). | |
514 | * | |
515 | * Returns: 0 | |
b3b94faa DT |
516 | */ |
517 | ||
518 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
519 | { | |
feaa7bba | 520 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa | 521 | |
b9c93bb7 SW |
522 | if (!(file->f_flags & O_NOATIME) && |
523 | !IS_NOATIME(&ip->i_inode)) { | |
48bf2b17 SW |
524 | struct gfs2_holder i_gh; |
525 | int error; | |
b3b94faa | 526 | |
3d162688 BM |
527 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
528 | &i_gh); | |
b9c93bb7 SW |
529 | if (error) |
530 | return error; | |
3d162688 BM |
531 | /* grab lock to update inode */ |
532 | gfs2_glock_dq_uninit(&i_gh); | |
533 | file_accessed(file); | |
48bf2b17 | 534 | } |
3cc3f710 | 535 | vma->vm_ops = &gfs2_vm_ops; |
b3b94faa | 536 | |
48bf2b17 | 537 | return 0; |
b3b94faa DT |
538 | } |
539 | ||
540 | /** | |
541 | * gfs2_open - open a file | |
542 | * @inode: the inode to open | |
543 | * @file: the struct file for this opening | |
544 | * | |
545 | * Returns: errno | |
546 | */ | |
547 | ||
548 | static int gfs2_open(struct inode *inode, struct file *file) | |
549 | { | |
feaa7bba | 550 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
551 | struct gfs2_holder i_gh; |
552 | struct gfs2_file *fp; | |
553 | int error; | |
554 | ||
b3b94faa DT |
555 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
556 | if (!fp) | |
557 | return -ENOMEM; | |
558 | ||
f55ab26a | 559 | mutex_init(&fp->f_fl_mutex); |
b3b94faa | 560 | |
feaa7bba | 561 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
5c676f6d | 562 | file->private_data = fp; |
b3b94faa | 563 | |
b60623c2 | 564 | if (S_ISREG(ip->i_inode.i_mode)) { |
b3b94faa DT |
565 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
566 | &i_gh); | |
567 | if (error) | |
568 | goto fail; | |
569 | ||
570 | if (!(file->f_flags & O_LARGEFILE) && | |
a2e0f799 | 571 | i_size_read(inode) > MAX_NON_LFS) { |
a9c62a18 | 572 | error = -EOVERFLOW; |
b3b94faa DT |
573 | goto fail_gunlock; |
574 | } | |
575 | ||
b3b94faa DT |
576 | gfs2_glock_dq_uninit(&i_gh); |
577 | } | |
578 | ||
579 | return 0; | |
580 | ||
420b9e5e | 581 | fail_gunlock: |
b3b94faa | 582 | gfs2_glock_dq_uninit(&i_gh); |
420b9e5e | 583 | fail: |
5c676f6d | 584 | file->private_data = NULL; |
b3b94faa | 585 | kfree(fp); |
b3b94faa DT |
586 | return error; |
587 | } | |
588 | ||
589 | /** | |
df3fd117 | 590 | * gfs2_release - called to close a struct file |
b3b94faa DT |
591 | * @inode: the inode the struct file belongs to |
592 | * @file: the struct file being closed | |
593 | * | |
594 | * Returns: errno | |
595 | */ | |
596 | ||
df3fd117 | 597 | static int gfs2_release(struct inode *inode, struct file *file) |
b3b94faa | 598 | { |
0a305e49 | 599 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 600 | |
8e2e0047 | 601 | kfree(file->private_data); |
5c676f6d | 602 | file->private_data = NULL; |
b3b94faa | 603 | |
2b3dcf35 BP |
604 | if (!(file->f_mode & FMODE_WRITE)) |
605 | return 0; | |
0a305e49 | 606 | |
2b3dcf35 | 607 | gfs2_rs_delete(ip); |
b3b94faa DT |
608 | return 0; |
609 | } | |
610 | ||
611 | /** | |
612 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
02c24a82 JB |
613 | * @file: the file that points to the dentry |
614 | * @start: the start position in the file to sync | |
615 | * @end: the end position in the file to sync | |
dba898b0 | 616 | * @datasync: set if we can ignore timestamp changes |
b3b94faa | 617 | * |
2f0264d5 SW |
618 | * We split the data flushing here so that we don't wait for the data |
619 | * until after we've also sent the metadata to disk. Note that for | |
620 | * data=ordered, we will write & wait for the data at the log flush | |
621 | * stage anyway, so this is unlikely to make much of a difference | |
622 | * except in the data=writeback case. | |
623 | * | |
624 | * If the fdatawrite fails due to any reason except -EIO, we will | |
625 | * continue the remainder of the fsync, although we'll still report | |
626 | * the error at the end. This is to match filemap_write_and_wait_range() | |
627 | * behaviour. | |
34126f9f | 628 | * |
b3b94faa DT |
629 | * Returns: errno |
630 | */ | |
631 | ||
02c24a82 JB |
632 | static int gfs2_fsync(struct file *file, loff_t start, loff_t end, |
633 | int datasync) | |
b3b94faa | 634 | { |
2f0264d5 SW |
635 | struct address_space *mapping = file->f_mapping; |
636 | struct inode *inode = mapping->host; | |
33c3de32 | 637 | int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); |
dba898b0 | 638 | struct gfs2_inode *ip = GFS2_I(inode); |
87654896 | 639 | int ret = 0, ret1 = 0; |
b3b94faa | 640 | |
2f0264d5 SW |
641 | if (mapping->nrpages) { |
642 | ret1 = filemap_fdatawrite_range(mapping, start, end); | |
643 | if (ret1 == -EIO) | |
644 | return ret1; | |
645 | } | |
02c24a82 | 646 | |
dba898b0 SW |
647 | if (datasync) |
648 | sync_state &= ~I_DIRTY_SYNC; | |
b3b94faa | 649 | |
dba898b0 SW |
650 | if (sync_state) { |
651 | ret = sync_inode_metadata(inode, 1); | |
b5b24d7a | 652 | if (ret) |
dba898b0 | 653 | return ret; |
f1818529 SW |
654 | if (gfs2_is_jdata(ip)) |
655 | filemap_write_and_wait(mapping); | |
b5b24d7a | 656 | gfs2_ail_flush(ip->i_gl, 1); |
33c3de32 SW |
657 | } |
658 | ||
2f0264d5 SW |
659 | if (mapping->nrpages) |
660 | ret = filemap_fdatawait_range(mapping, start, end); | |
661 | ||
662 | return ret ? ret : ret1; | |
b3b94faa DT |
663 | } |
664 | ||
56aa616a SW |
665 | /** |
666 | * gfs2_file_aio_write - Perform a write to a file | |
667 | * @iocb: The io context | |
668 | * @iov: The data to write | |
669 | * @nr_segs: Number of @iov segments | |
670 | * @pos: The file position | |
671 | * | |
672 | * We have to do a lock/unlock here to refresh the inode size for | |
673 | * O_APPEND writes, otherwise we can land up writing at the wrong | |
674 | * offset. There is still a race, but provided the app is using its | |
675 | * own file locking, this will make O_APPEND work as expected. | |
676 | * | |
677 | */ | |
678 | ||
679 | static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
680 | unsigned long nr_segs, loff_t pos) | |
681 | { | |
682 | struct file *file = iocb->ki_filp; | |
8e2e0047 | 683 | size_t writesize = iov_length(iov, nr_segs); |
496ad9aa | 684 | struct gfs2_inode *ip = GFS2_I(file_inode(file)); |
0a305e49 BP |
685 | int ret; |
686 | ||
687 | ret = gfs2_rs_alloc(ip); | |
688 | if (ret) | |
689 | return ret; | |
56aa616a | 690 | |
da1dfb6a SW |
691 | gfs2_size_hint(file, pos, writesize); |
692 | ||
56aa616a | 693 | if (file->f_flags & O_APPEND) { |
56aa616a | 694 | struct gfs2_holder gh; |
56aa616a SW |
695 | |
696 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
697 | if (ret) | |
698 | return ret; | |
699 | gfs2_glock_dq_uninit(&gh); | |
700 | } | |
701 | ||
702 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
703 | } | |
704 | ||
2fe17c10 CH |
705 | static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len, |
706 | int mode) | |
707 | { | |
708 | struct gfs2_inode *ip = GFS2_I(inode); | |
709 | struct buffer_head *dibh; | |
710 | int error; | |
58a7d5fb | 711 | loff_t size = len; |
64dd153c BM |
712 | unsigned int nr_blks; |
713 | sector_t lblock = offset >> inode->i_blkbits; | |
2fe17c10 CH |
714 | |
715 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
716 | if (unlikely(error)) | |
64dd153c | 717 | return error; |
2fe17c10 | 718 | |
350a9b0a | 719 | gfs2_trans_add_meta(ip->i_gl, dibh); |
2fe17c10 CH |
720 | |
721 | if (gfs2_is_stuffed(ip)) { | |
722 | error = gfs2_unstuff_dinode(ip, NULL); | |
723 | if (unlikely(error)) | |
724 | goto out; | |
725 | } | |
726 | ||
64dd153c BM |
727 | while (len) { |
728 | struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; | |
729 | bh_map.b_size = len; | |
730 | set_buffer_zeronew(&bh_map); | |
2fe17c10 | 731 | |
64dd153c BM |
732 | error = gfs2_block_map(inode, lblock, &bh_map, 1); |
733 | if (unlikely(error)) | |
734 | goto out; | |
735 | len -= bh_map.b_size; | |
736 | nr_blks = bh_map.b_size >> inode->i_blkbits; | |
737 | lblock += nr_blks; | |
738 | if (!buffer_new(&bh_map)) | |
739 | continue; | |
740 | if (unlikely(!buffer_zeronew(&bh_map))) { | |
741 | error = -EIO; | |
2fe17c10 | 742 | goto out; |
64dd153c | 743 | } |
2fe17c10 | 744 | } |
58a7d5fb BM |
745 | if (offset + size > inode->i_size && !(mode & FALLOC_FL_KEEP_SIZE)) |
746 | i_size_write(inode, offset + size); | |
2fe17c10 | 747 | |
2fe17c10 CH |
748 | mark_inode_dirty(inode); |
749 | ||
2fe17c10 | 750 | out: |
64dd153c | 751 | brelse(dibh); |
2fe17c10 CH |
752 | return error; |
753 | } | |
754 | ||
755 | static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len, | |
756 | unsigned int *data_blocks, unsigned int *ind_blocks) | |
757 | { | |
758 | const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); | |
54335b1f | 759 | unsigned int max_blocks = ip->i_rgd->rd_free_clone; |
2fe17c10 CH |
760 | unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1); |
761 | ||
762 | for (tmp = max_data; tmp > sdp->sd_diptrs;) { | |
763 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); | |
764 | max_data -= tmp; | |
765 | } | |
766 | /* This calculation isn't the exact reverse of gfs2_write_calc_reserve, | |
767 | so it might end up with fewer data blocks */ | |
768 | if (max_data <= *data_blocks) | |
769 | return; | |
770 | *data_blocks = max_data; | |
771 | *ind_blocks = max_blocks - max_data; | |
772 | *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift; | |
773 | if (*len > max) { | |
774 | *len = max; | |
775 | gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks); | |
776 | } | |
777 | } | |
778 | ||
779 | static long gfs2_fallocate(struct file *file, int mode, loff_t offset, | |
780 | loff_t len) | |
781 | { | |
496ad9aa | 782 | struct inode *inode = file_inode(file); |
2fe17c10 CH |
783 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
784 | struct gfs2_inode *ip = GFS2_I(inode); | |
785 | unsigned int data_blocks = 0, ind_blocks = 0, rblocks; | |
786 | loff_t bytes, max_bytes; | |
2fe17c10 | 787 | int error; |
4442f2e0 SW |
788 | const loff_t pos = offset; |
789 | const loff_t count = len; | |
6905d9e4 | 790 | loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1); |
2fe17c10 | 791 | loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift; |
64dd153c | 792 | loff_t max_chunk_size = UINT_MAX & bsize_mask; |
2fe17c10 CH |
793 | next = (next + 1) << sdp->sd_sb.sb_bsize_shift; |
794 | ||
795 | /* We only support the FALLOC_FL_KEEP_SIZE mode */ | |
796 | if (mode & ~FALLOC_FL_KEEP_SIZE) | |
797 | return -EOPNOTSUPP; | |
798 | ||
6905d9e4 | 799 | offset &= bsize_mask; |
2fe17c10 CH |
800 | |
801 | len = next - offset; | |
802 | bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2; | |
803 | if (!bytes) | |
804 | bytes = UINT_MAX; | |
6905d9e4 BM |
805 | bytes &= bsize_mask; |
806 | if (bytes == 0) | |
807 | bytes = sdp->sd_sb.sb_bsize; | |
2fe17c10 | 808 | |
0a305e49 BP |
809 | error = gfs2_rs_alloc(ip); |
810 | if (error) | |
811 | return error; | |
812 | ||
2fe17c10 CH |
813 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); |
814 | error = gfs2_glock_nq(&ip->i_gh); | |
815 | if (unlikely(error)) | |
816 | goto out_uninit; | |
817 | ||
da1dfb6a | 818 | gfs2_size_hint(file, offset, len); |
8e2e0047 | 819 | |
2fe17c10 CH |
820 | while (len > 0) { |
821 | if (len < bytes) | |
822 | bytes = len; | |
58a7d5fb BM |
823 | if (!gfs2_write_alloc_required(ip, offset, bytes)) { |
824 | len -= bytes; | |
825 | offset += bytes; | |
826 | continue; | |
827 | } | |
2fe17c10 CH |
828 | error = gfs2_quota_lock_check(ip); |
829 | if (error) | |
5407e242 | 830 | goto out_unlock; |
2fe17c10 CH |
831 | |
832 | retry: | |
833 | gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks); | |
834 | ||
9dbe9610 | 835 | error = gfs2_inplace_reserve(ip, data_blocks + ind_blocks, 0); |
2fe17c10 CH |
836 | if (error) { |
837 | if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) { | |
838 | bytes >>= 1; | |
6905d9e4 BM |
839 | bytes &= bsize_mask; |
840 | if (bytes == 0) | |
841 | bytes = sdp->sd_sb.sb_bsize; | |
2fe17c10 CH |
842 | goto retry; |
843 | } | |
844 | goto out_qunlock; | |
845 | } | |
846 | max_bytes = bytes; | |
64dd153c BM |
847 | calc_max_reserv(ip, (len > max_chunk_size)? max_chunk_size: len, |
848 | &max_bytes, &data_blocks, &ind_blocks); | |
2fe17c10 CH |
849 | |
850 | rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA + | |
71f890f7 | 851 | RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks); |
2fe17c10 CH |
852 | if (gfs2_is_jdata(ip)) |
853 | rblocks += data_blocks ? data_blocks : 1; | |
854 | ||
855 | error = gfs2_trans_begin(sdp, rblocks, | |
856 | PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); | |
857 | if (error) | |
858 | goto out_trans_fail; | |
859 | ||
860 | error = fallocate_chunk(inode, offset, max_bytes, mode); | |
861 | gfs2_trans_end(sdp); | |
862 | ||
863 | if (error) | |
864 | goto out_trans_fail; | |
865 | ||
866 | len -= max_bytes; | |
867 | offset += max_bytes; | |
868 | gfs2_inplace_release(ip); | |
869 | gfs2_quota_unlock(ip); | |
2fe17c10 | 870 | } |
4442f2e0 SW |
871 | |
872 | if (error == 0) | |
873 | error = generic_write_sync(file, pos, count); | |
2fe17c10 CH |
874 | goto out_unlock; |
875 | ||
876 | out_trans_fail: | |
877 | gfs2_inplace_release(ip); | |
878 | out_qunlock: | |
879 | gfs2_quota_unlock(ip); | |
2fe17c10 CH |
880 | out_unlock: |
881 | gfs2_glock_dq(&ip->i_gh); | |
882 | out_uninit: | |
883 | gfs2_holder_uninit(&ip->i_gh); | |
884 | return error; | |
885 | } | |
886 | ||
f057f6cd SW |
887 | #ifdef CONFIG_GFS2_FS_LOCKING_DLM |
888 | ||
60446067 ME |
889 | /** |
890 | * gfs2_setlease - acquire/release a file lease | |
891 | * @file: the file pointer | |
892 | * @arg: lease type | |
893 | * @fl: file lock | |
894 | * | |
f057f6cd SW |
895 | * We don't currently have a way to enforce a lease across the whole |
896 | * cluster; until we do, disable leases (by just returning -EINVAL), | |
897 | * unless the administrator has requested purely local locking. | |
898 | * | |
b89f4321 AB |
899 | * Locking: called under lock_flocks |
900 | * | |
60446067 ME |
901 | * Returns: errno |
902 | */ | |
903 | ||
904 | static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) | |
905 | { | |
f057f6cd | 906 | return -EINVAL; |
da755fdb SW |
907 | } |
908 | ||
b3b94faa DT |
909 | /** |
910 | * gfs2_lock - acquire/release a posix lock on a file | |
911 | * @file: the file pointer | |
912 | * @cmd: either modify or retrieve lock state, possibly wait | |
913 | * @fl: type and range of lock | |
914 | * | |
915 | * Returns: errno | |
916 | */ | |
917 | ||
918 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
919 | { | |
feaa7bba SW |
920 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
921 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
f057f6cd | 922 | struct lm_lockstruct *ls = &sdp->sd_lockstruct; |
b3b94faa | 923 | |
b3b94faa DT |
924 | if (!(fl->fl_flags & FL_POSIX)) |
925 | return -ENOLCK; | |
720e7749 | 926 | if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK) |
b3b94faa DT |
927 | return -ENOLCK; |
928 | ||
586759f0 ME |
929 | if (cmd == F_CANCELLK) { |
930 | /* Hack: */ | |
931 | cmd = F_SETLK; | |
932 | fl->fl_type = F_UNLCK; | |
933 | } | |
c2952d20 SW |
934 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { |
935 | if (fl->fl_type == F_UNLCK) | |
936 | posix_lock_file_wait(file, fl); | |
f057f6cd | 937 | return -EIO; |
c2952d20 | 938 | } |
b3b94faa | 939 | if (IS_GETLK(cmd)) |
f057f6cd | 940 | return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); |
b3b94faa | 941 | else if (fl->fl_type == F_UNLCK) |
f057f6cd | 942 | return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); |
b3b94faa | 943 | else |
f057f6cd | 944 | return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); |
b3b94faa DT |
945 | } |
946 | ||
b3b94faa DT |
947 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
948 | { | |
5c676f6d | 949 | struct gfs2_file *fp = file->private_data; |
b3b94faa | 950 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
496ad9aa | 951 | struct gfs2_inode *ip = GFS2_I(file_inode(file)); |
b3b94faa DT |
952 | struct gfs2_glock *gl; |
953 | unsigned int state; | |
954 | int flags; | |
955 | int error = 0; | |
956 | ||
957 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
6802e340 | 958 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; |
b3b94faa | 959 | |
f55ab26a | 960 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
961 | |
962 | gl = fl_gh->gh_gl; | |
963 | if (gl) { | |
964 | if (fl_gh->gh_state == state) | |
965 | goto out; | |
b3b94faa | 966 | flock_lock_file_wait(file, |
907b9bce | 967 | &(struct file_lock){.fl_type = F_UNLCK}); |
b4c20166 AD |
968 | gfs2_glock_dq_wait(fl_gh); |
969 | gfs2_holder_reinit(state, flags, fl_gh); | |
b3b94faa | 970 | } else { |
6802e340 SW |
971 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, |
972 | &gfs2_flock_glops, CREATE, &gl); | |
b3b94faa DT |
973 | if (error) |
974 | goto out; | |
b4c20166 AD |
975 | gfs2_holder_init(gl, state, flags, fl_gh); |
976 | gfs2_glock_put(gl); | |
b3b94faa | 977 | } |
b3b94faa DT |
978 | error = gfs2_glock_nq(fl_gh); |
979 | if (error) { | |
980 | gfs2_holder_uninit(fl_gh); | |
981 | if (error == GLR_TRYFAILED) | |
982 | error = -EAGAIN; | |
983 | } else { | |
984 | error = flock_lock_file_wait(file, fl); | |
feaa7bba | 985 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
b3b94faa DT |
986 | } |
987 | ||
420b9e5e | 988 | out: |
f55ab26a | 989 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
990 | return error; |
991 | } | |
992 | ||
993 | static void do_unflock(struct file *file, struct file_lock *fl) | |
994 | { | |
5c676f6d | 995 | struct gfs2_file *fp = file->private_data; |
b3b94faa DT |
996 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
997 | ||
f55ab26a | 998 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa | 999 | flock_lock_file_wait(file, fl); |
0a33443b SW |
1000 | if (fl_gh->gh_gl) { |
1001 | gfs2_glock_dq_wait(fl_gh); | |
1002 | gfs2_holder_uninit(fl_gh); | |
1003 | } | |
f55ab26a | 1004 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
1005 | } |
1006 | ||
1007 | /** | |
1008 | * gfs2_flock - acquire/release a flock lock on a file | |
1009 | * @file: the file pointer | |
1010 | * @cmd: either modify or retrieve lock state, possibly wait | |
1011 | * @fl: type and range of lock | |
1012 | * | |
1013 | * Returns: errno | |
1014 | */ | |
1015 | ||
1016 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
1017 | { | |
b3b94faa DT |
1018 | if (!(fl->fl_flags & FL_FLOCK)) |
1019 | return -ENOLCK; | |
a12af1eb AD |
1020 | if (fl->fl_type & LOCK_MAND) |
1021 | return -EOPNOTSUPP; | |
b3b94faa | 1022 | |
b3b94faa DT |
1023 | if (fl->fl_type == F_UNLCK) { |
1024 | do_unflock(file, fl); | |
1025 | return 0; | |
d00223f1 | 1026 | } else { |
b3b94faa | 1027 | return do_flock(file, cmd, fl); |
d00223f1 | 1028 | } |
b3b94faa DT |
1029 | } |
1030 | ||
10d21988 | 1031 | const struct file_operations gfs2_file_fops = { |
26c1a574 | 1032 | .llseek = gfs2_llseek, |
d00223f1 | 1033 | .read = do_sync_read, |
26c1a574 | 1034 | .aio_read = generic_file_aio_read, |
d00223f1 | 1035 | .write = do_sync_write, |
56aa616a | 1036 | .aio_write = gfs2_file_aio_write, |
26c1a574 SW |
1037 | .unlocked_ioctl = gfs2_ioctl, |
1038 | .mmap = gfs2_mmap, | |
1039 | .open = gfs2_open, | |
df3fd117 | 1040 | .release = gfs2_release, |
26c1a574 SW |
1041 | .fsync = gfs2_fsync, |
1042 | .lock = gfs2_lock, | |
26c1a574 SW |
1043 | .flock = gfs2_flock, |
1044 | .splice_read = generic_file_splice_read, | |
1045 | .splice_write = generic_file_splice_write, | |
60446067 | 1046 | .setlease = gfs2_setlease, |
2fe17c10 | 1047 | .fallocate = gfs2_fallocate, |
b3b94faa DT |
1048 | }; |
1049 | ||
10d21988 | 1050 | const struct file_operations gfs2_dir_fops = { |
26c1a574 SW |
1051 | .readdir = gfs2_readdir, |
1052 | .unlocked_ioctl = gfs2_ioctl, | |
1053 | .open = gfs2_open, | |
df3fd117 | 1054 | .release = gfs2_release, |
26c1a574 SW |
1055 | .fsync = gfs2_fsync, |
1056 | .lock = gfs2_lock, | |
1057 | .flock = gfs2_flock, | |
6038f373 | 1058 | .llseek = default_llseek, |
b3b94faa DT |
1059 | }; |
1060 | ||
f057f6cd SW |
1061 | #endif /* CONFIG_GFS2_FS_LOCKING_DLM */ |
1062 | ||
10d21988 | 1063 | const struct file_operations gfs2_file_fops_nolock = { |
c97bfe43 WC |
1064 | .llseek = gfs2_llseek, |
1065 | .read = do_sync_read, | |
1066 | .aio_read = generic_file_aio_read, | |
1067 | .write = do_sync_write, | |
56aa616a | 1068 | .aio_write = gfs2_file_aio_write, |
c97bfe43 WC |
1069 | .unlocked_ioctl = gfs2_ioctl, |
1070 | .mmap = gfs2_mmap, | |
1071 | .open = gfs2_open, | |
df3fd117 | 1072 | .release = gfs2_release, |
c97bfe43 WC |
1073 | .fsync = gfs2_fsync, |
1074 | .splice_read = generic_file_splice_read, | |
1075 | .splice_write = generic_file_splice_write, | |
f057f6cd | 1076 | .setlease = generic_setlease, |
2fe17c10 | 1077 | .fallocate = gfs2_fallocate, |
c97bfe43 WC |
1078 | }; |
1079 | ||
10d21988 | 1080 | const struct file_operations gfs2_dir_fops_nolock = { |
c97bfe43 WC |
1081 | .readdir = gfs2_readdir, |
1082 | .unlocked_ioctl = gfs2_ioctl, | |
1083 | .open = gfs2_open, | |
df3fd117 | 1084 | .release = gfs2_release, |
c97bfe43 | 1085 | .fsync = gfs2_fsync, |
6038f373 | 1086 | .llseek = default_llseek, |
c97bfe43 WC |
1087 | }; |
1088 |