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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> | |
a27bb332 | 28 | #include <linux/aio.h> |
2ddfbdd6 | 29 | #include <linux/delay.h> |
b3b94faa DT |
30 | |
31 | #include "gfs2.h" | |
5c676f6d | 32 | #include "incore.h" |
b3b94faa DT |
33 | #include "bmap.h" |
34 | #include "dir.h" | |
35 | #include "glock.h" | |
36 | #include "glops.h" | |
37 | #include "inode.h" | |
b3b94faa DT |
38 | #include "log.h" |
39 | #include "meta_io.h" | |
b3b94faa DT |
40 | #include "quota.h" |
41 | #include "rgrp.h" | |
42 | #include "trans.h" | |
5c676f6d | 43 | #include "util.h" |
b3b94faa | 44 | |
b3b94faa DT |
45 | /** |
46 | * gfs2_llseek - seek to a location in a file | |
47 | * @file: the file | |
48 | * @offset: the offset | |
965c8e59 | 49 | * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) |
b3b94faa DT |
50 | * |
51 | * SEEK_END requires the glock for the file because it references the | |
52 | * file's size. | |
53 | * | |
54 | * Returns: The new offset, or errno | |
55 | */ | |
56 | ||
965c8e59 | 57 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence) |
b3b94faa | 58 | { |
feaa7bba | 59 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa DT |
60 | struct gfs2_holder i_gh; |
61 | loff_t error; | |
62 | ||
965c8e59 | 63 | switch (whence) { |
9453615a SW |
64 | case SEEK_END: /* These reference inode->i_size */ |
65 | case SEEK_DATA: | |
66 | case SEEK_HOLE: | |
b3b94faa DT |
67 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
68 | &i_gh); | |
69 | if (!error) { | |
965c8e59 | 70 | error = generic_file_llseek(file, offset, whence); |
b3b94faa DT |
71 | gfs2_glock_dq_uninit(&i_gh); |
72 | } | |
9453615a SW |
73 | break; |
74 | case SEEK_CUR: | |
75 | case SEEK_SET: | |
965c8e59 | 76 | error = generic_file_llseek(file, offset, whence); |
9453615a SW |
77 | break; |
78 | default: | |
79 | error = -EINVAL; | |
80 | } | |
b3b94faa DT |
81 | |
82 | return error; | |
83 | } | |
84 | ||
b3b94faa | 85 | /** |
d81a8ef5 | 86 | * gfs2_readdir - Iterator for a directory |
b3b94faa | 87 | * @file: The directory to read from |
d81a8ef5 | 88 | * @ctx: What to feed directory entries to |
b3b94faa DT |
89 | * |
90 | * Returns: errno | |
91 | */ | |
92 | ||
d81a8ef5 | 93 | static int gfs2_readdir(struct file *file, struct dir_context *ctx) |
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; |
b3b94faa DT |
98 | int error; |
99 | ||
d81a8ef5 AV |
100 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
101 | if (error) | |
b3b94faa | 102 | return error; |
b3b94faa | 103 | |
d81a8ef5 | 104 | error = gfs2_dir_read(dir, ctx, &file->f_ra); |
b3b94faa DT |
105 | |
106 | gfs2_glock_dq_uninit(&d_gh); | |
107 | ||
b3b94faa DT |
108 | return error; |
109 | } | |
110 | ||
128e5eba SW |
111 | /** |
112 | * fsflags_cvt | |
113 | * @table: A table of 32 u32 flags | |
114 | * @val: a 32 bit value to convert | |
115 | * | |
116 | * This function can be used to convert between fsflags values and | |
117 | * GFS2's own flags values. | |
118 | * | |
119 | * Returns: the converted flags | |
120 | */ | |
121 | static u32 fsflags_cvt(const u32 *table, u32 val) | |
122 | { | |
123 | u32 res = 0; | |
124 | while(val) { | |
125 | if (val & 1) | |
126 | res |= *table; | |
127 | table++; | |
128 | val >>= 1; | |
129 | } | |
130 | return res; | |
131 | } | |
b3b94faa | 132 | |
128e5eba SW |
133 | static const u32 fsflags_to_gfs2[32] = { |
134 | [3] = GFS2_DIF_SYNC, | |
135 | [4] = GFS2_DIF_IMMUTABLE, | |
136 | [5] = GFS2_DIF_APPENDONLY, | |
137 | [7] = GFS2_DIF_NOATIME, | |
138 | [12] = GFS2_DIF_EXHASH, | |
b9af7ca6 | 139 | [14] = GFS2_DIF_INHERIT_JDATA, |
23d0bb83 | 140 | [17] = GFS2_DIF_TOPDIR, |
71b86f56 SW |
141 | }; |
142 | ||
128e5eba SW |
143 | static const u32 gfs2_to_fsflags[32] = { |
144 | [gfs2fl_Sync] = FS_SYNC_FL, | |
145 | [gfs2fl_Immutable] = FS_IMMUTABLE_FL, | |
146 | [gfs2fl_AppendOnly] = FS_APPEND_FL, | |
147 | [gfs2fl_NoAtime] = FS_NOATIME_FL, | |
148 | [gfs2fl_ExHash] = FS_INDEX_FL, | |
23d0bb83 | 149 | [gfs2fl_TopLevel] = FS_TOPDIR_FL, |
128e5eba | 150 | [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, |
7ea9ea83 | 151 | }; |
71b86f56 | 152 | |
b09e593d | 153 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 154 | { |
496ad9aa | 155 | struct inode *inode = file_inode(filp); |
feaa7bba | 156 | struct gfs2_inode *ip = GFS2_I(inode); |
71b86f56 SW |
157 | struct gfs2_holder gh; |
158 | int error; | |
128e5eba | 159 | u32 fsflags; |
71b86f56 | 160 | |
719ee344 SW |
161 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
162 | error = gfs2_glock_nq(&gh); | |
71b86f56 SW |
163 | if (error) |
164 | return error; | |
907b9bce | 165 | |
383f01fb SW |
166 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags); |
167 | if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA) | |
c9f6a6bb | 168 | fsflags |= FS_JOURNAL_DATA_FL; |
128e5eba | 169 | if (put_user(fsflags, ptr)) |
71b86f56 SW |
170 | error = -EFAULT; |
171 | ||
3cc3f710 | 172 | gfs2_glock_dq(&gh); |
71b86f56 SW |
173 | gfs2_holder_uninit(&gh); |
174 | return error; | |
175 | } | |
176 | ||
6b124d8d SW |
177 | void gfs2_set_inode_flags(struct inode *inode) |
178 | { | |
179 | struct gfs2_inode *ip = GFS2_I(inode); | |
6b124d8d SW |
180 | unsigned int flags = inode->i_flags; |
181 | ||
9964afbb SW |
182 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC); |
183 | if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode)) | |
184 | inode->i_flags |= S_NOSEC; | |
383f01fb | 185 | if (ip->i_diskflags & GFS2_DIF_IMMUTABLE) |
6b124d8d | 186 | flags |= S_IMMUTABLE; |
383f01fb | 187 | if (ip->i_diskflags & GFS2_DIF_APPENDONLY) |
6b124d8d | 188 | flags |= S_APPEND; |
383f01fb | 189 | if (ip->i_diskflags & GFS2_DIF_NOATIME) |
6b124d8d | 190 | flags |= S_NOATIME; |
383f01fb | 191 | if (ip->i_diskflags & GFS2_DIF_SYNC) |
6b124d8d SW |
192 | flags |= S_SYNC; |
193 | inode->i_flags = flags; | |
194 | } | |
195 | ||
71b86f56 SW |
196 | /* Flags that can be set by user space */ |
197 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
71b86f56 SW |
198 | GFS2_DIF_IMMUTABLE| \ |
199 | GFS2_DIF_APPENDONLY| \ | |
200 | GFS2_DIF_NOATIME| \ | |
201 | GFS2_DIF_SYNC| \ | |
202 | GFS2_DIF_SYSTEM| \ | |
23d0bb83 | 203 | GFS2_DIF_TOPDIR| \ |
71b86f56 SW |
204 | GFS2_DIF_INHERIT_JDATA) |
205 | ||
206 | /** | |
9dd868e1 FF |
207 | * do_gfs2_set_flags - set flags on an inode |
208 | * @filp: file pointer | |
209 | * @reqflags: The flags to set | |
71b86f56 SW |
210 | * @mask: Indicates which flags are valid |
211 | * | |
212 | */ | |
b09e593d | 213 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
71b86f56 | 214 | { |
496ad9aa | 215 | struct inode *inode = file_inode(filp); |
feaa7bba SW |
216 | struct gfs2_inode *ip = GFS2_I(inode); |
217 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
71b86f56 SW |
218 | struct buffer_head *bh; |
219 | struct gfs2_holder gh; | |
220 | int error; | |
55eccc6d | 221 | u32 new_flags, flags; |
71b86f56 | 222 | |
a561be71 | 223 | error = mnt_want_write_file(filp); |
52f341cf | 224 | if (error) |
71b86f56 SW |
225 | return error; |
226 | ||
f58ba889 MS |
227 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
228 | if (error) | |
229 | goto out_drop_write; | |
230 | ||
7df0e039 | 231 | error = -EACCES; |
2e149670 | 232 | if (!inode_owner_or_capable(inode)) |
7df0e039 SW |
233 | goto out; |
234 | ||
235 | error = 0; | |
383f01fb | 236 | flags = ip->i_diskflags; |
55eccc6d | 237 | new_flags = (flags & ~mask) | (reqflags & mask); |
71b86f56 SW |
238 | if ((new_flags ^ flags) == 0) |
239 | goto out; | |
240 | ||
241 | error = -EINVAL; | |
242 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) | |
243 | goto out; | |
244 | ||
71b86f56 SW |
245 | error = -EPERM; |
246 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
247 | goto out; | |
248 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
249 | goto out; | |
907b9bce | 250 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
b9cb9813 | 251 | !capable(CAP_LINUX_IMMUTABLE)) |
71b86f56 | 252 | goto out; |
b9cb9813 | 253 | if (!IS_IMMUTABLE(inode)) { |
10556cb2 | 254 | error = gfs2_permission(inode, MAY_WRITE); |
b9cb9813 SW |
255 | if (error) |
256 | goto out; | |
257 | } | |
5561093e SW |
258 | if ((flags ^ new_flags) & GFS2_DIF_JDATA) { |
259 | if (flags & GFS2_DIF_JDATA) | |
24972557 | 260 | gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH); |
5561093e SW |
261 | error = filemap_fdatawrite(inode->i_mapping); |
262 | if (error) | |
263 | goto out; | |
264 | error = filemap_fdatawait(inode->i_mapping); | |
265 | if (error) | |
266 | goto out; | |
267 | } | |
55eccc6d | 268 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
71b86f56 SW |
269 | if (error) |
270 | goto out; | |
55eccc6d SW |
271 | error = gfs2_meta_inode_buffer(ip, &bh); |
272 | if (error) | |
273 | goto out_trans_end; | |
350a9b0a | 274 | gfs2_trans_add_meta(ip->i_gl, bh); |
383f01fb | 275 | ip->i_diskflags = new_flags; |
539e5d6b | 276 | gfs2_dinode_out(ip, bh->b_data); |
71b86f56 | 277 | brelse(bh); |
6b124d8d | 278 | gfs2_set_inode_flags(inode); |
5561093e | 279 | gfs2_set_aops(inode); |
55eccc6d SW |
280 | out_trans_end: |
281 | gfs2_trans_end(sdp); | |
71b86f56 SW |
282 | out: |
283 | gfs2_glock_dq_uninit(&gh); | |
f58ba889 | 284 | out_drop_write: |
2a79f17e | 285 | mnt_drop_write_file(filp); |
71b86f56 SW |
286 | return error; |
287 | } | |
288 | ||
b09e593d | 289 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 290 | { |
496ad9aa | 291 | struct inode *inode = file_inode(filp); |
128e5eba | 292 | u32 fsflags, gfsflags; |
7df0e039 | 293 | |
128e5eba | 294 | if (get_user(fsflags, ptr)) |
71b86f56 | 295 | return -EFAULT; |
7df0e039 | 296 | |
128e5eba | 297 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); |
b9af7ca6 | 298 | if (!S_ISDIR(inode->i_mode)) { |
23d0bb83 | 299 | gfsflags &= ~GFS2_DIF_TOPDIR; |
b9af7ca6 SW |
300 | if (gfsflags & GFS2_DIF_INHERIT_JDATA) |
301 | gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); | |
b9af7ca6 SW |
302 | return do_gfs2_set_flags(filp, gfsflags, ~0); |
303 | } | |
304 | return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); | |
71b86f56 SW |
305 | } |
306 | ||
b09e593d | 307 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
71b86f56 SW |
308 | { |
309 | switch(cmd) { | |
128e5eba | 310 | case FS_IOC_GETFLAGS: |
b09e593d | 311 | return gfs2_get_flags(filp, (u32 __user *)arg); |
128e5eba | 312 | case FS_IOC_SETFLAGS: |
b09e593d | 313 | return gfs2_set_flags(filp, (u32 __user *)arg); |
66fc061b SW |
314 | case FITRIM: |
315 | return gfs2_fitrim(filp, (void __user *)arg); | |
71b86f56 SW |
316 | } |
317 | return -ENOTTY; | |
318 | } | |
319 | ||
da1dfb6a SW |
320 | /** |
321 | * gfs2_size_hint - Give a hint to the size of a write request | |
9dd868e1 | 322 | * @filep: The struct file |
da1dfb6a SW |
323 | * @offset: The file offset of the write |
324 | * @size: The length of the write | |
325 | * | |
326 | * When we are about to do a write, this function records the total | |
327 | * write size in order to provide a suitable hint to the lower layers | |
328 | * about how many blocks will be required. | |
329 | * | |
330 | */ | |
331 | ||
332 | static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size) | |
333 | { | |
496ad9aa | 334 | struct inode *inode = file_inode(filep); |
da1dfb6a SW |
335 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
336 | struct gfs2_inode *ip = GFS2_I(inode); | |
337 | size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift; | |
338 | int hint = min_t(size_t, INT_MAX, blks); | |
339 | ||
33ad5d54 BP |
340 | if (hint > atomic_read(&ip->i_res->rs_sizehint)) |
341 | atomic_set(&ip->i_res->rs_sizehint, hint); | |
da1dfb6a SW |
342 | } |
343 | ||
3cc3f710 SW |
344 | /** |
345 | * gfs2_allocate_page_backing - Use bmap to allocate blocks | |
346 | * @page: The (locked) page to allocate backing for | |
347 | * | |
348 | * We try to allocate all the blocks required for the page in | |
349 | * one go. This might fail for various reasons, so we keep | |
350 | * trying until all the blocks to back this page are allocated. | |
351 | * If some of the blocks are already allocated, thats ok too. | |
352 | */ | |
353 | ||
354 | static int gfs2_allocate_page_backing(struct page *page) | |
355 | { | |
356 | struct inode *inode = page->mapping->host; | |
357 | struct buffer_head bh; | |
358 | unsigned long size = PAGE_CACHE_SIZE; | |
359 | u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
360 | ||
361 | do { | |
362 | bh.b_state = 0; | |
363 | bh.b_size = size; | |
e9e1ef2b | 364 | gfs2_block_map(inode, lblock, &bh, 1); |
3cc3f710 SW |
365 | if (!buffer_mapped(&bh)) |
366 | return -EIO; | |
367 | size -= bh.b_size; | |
368 | lblock += (bh.b_size >> inode->i_blkbits); | |
369 | } while(size > 0); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | /** | |
374 | * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable | |
375 | * @vma: The virtual memory area | |
9dd868e1 | 376 | * @vmf: The virtual memory fault containing the page to become writable |
3cc3f710 SW |
377 | * |
378 | * When the page becomes writable, we need to ensure that we have | |
379 | * blocks allocated on disk to back that page. | |
380 | */ | |
381 | ||
c2ec175c | 382 | static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
3cc3f710 | 383 | { |
c2ec175c | 384 | struct page *page = vmf->page; |
496ad9aa | 385 | struct inode *inode = file_inode(vma->vm_file); |
3cc3f710 SW |
386 | struct gfs2_inode *ip = GFS2_I(inode); |
387 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
7b9cff46 | 388 | struct gfs2_alloc_parms ap = { .aflags = 0, }; |
3cc3f710 | 389 | unsigned long last_index; |
c8f554b9 | 390 | u64 pos = page->index << PAGE_CACHE_SHIFT; |
3cc3f710 | 391 | unsigned int data_blocks, ind_blocks, rblocks; |
3cc3f710 | 392 | struct gfs2_holder gh; |
13d921e3 | 393 | loff_t size; |
3cc3f710 SW |
394 | int ret; |
395 | ||
39263d5e | 396 | sb_start_pagefault(inode->i_sb); |
13d921e3 | 397 | |
a63e9b2e JK |
398 | /* Update file times before taking page lock */ |
399 | file_update_time(vma->vm_file); | |
13d921e3 | 400 | |
2b3dcf35 BP |
401 | ret = get_write_access(inode); |
402 | if (ret) | |
403 | goto out; | |
404 | ||
0a305e49 BP |
405 | ret = gfs2_rs_alloc(ip); |
406 | if (ret) | |
2b3dcf35 | 407 | goto out_write_access; |
0a305e49 | 408 | |
da1dfb6a | 409 | gfs2_size_hint(vma->vm_file, pos, PAGE_CACHE_SIZE); |
8e2e0047 | 410 | |
719ee344 SW |
411 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
412 | ret = gfs2_glock_nq(&gh); | |
3cc3f710 | 413 | if (ret) |
2b3dcf35 | 414 | goto out_uninit; |
3cc3f710 | 415 | |
9c538837 SW |
416 | set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); |
417 | set_bit(GIF_SW_PAGED, &ip->i_flags); | |
418 | ||
13d921e3 SW |
419 | if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) { |
420 | lock_page(page); | |
421 | if (!PageUptodate(page) || page->mapping != inode->i_mapping) { | |
422 | ret = -EAGAIN; | |
423 | unlock_page(page); | |
424 | } | |
3cc3f710 | 425 | goto out_unlock; |
13d921e3 SW |
426 | } |
427 | ||
5407e242 BP |
428 | ret = gfs2_rindex_update(sdp); |
429 | if (ret) | |
6dbd8224 SW |
430 | goto out_unlock; |
431 | ||
d82661d9 | 432 | ret = gfs2_quota_lock_check(ip); |
3cc3f710 | 433 | if (ret) |
5407e242 | 434 | goto out_unlock; |
7ed122e4 | 435 | gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); |
7b9cff46 SW |
436 | ap.target = data_blocks + ind_blocks; |
437 | ret = gfs2_inplace_reserve(ip, &ap); | |
3cc3f710 SW |
438 | if (ret) |
439 | goto out_quota_unlock; | |
440 | ||
441 | rblocks = RES_DINODE + ind_blocks; | |
442 | if (gfs2_is_jdata(ip)) | |
443 | rblocks += data_blocks ? data_blocks : 1; | |
bf97b673 | 444 | if (ind_blocks || data_blocks) { |
3cc3f710 | 445 | rblocks += RES_STATFS + RES_QUOTA; |
71f890f7 | 446 | rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks); |
bf97b673 | 447 | } |
3cc3f710 SW |
448 | ret = gfs2_trans_begin(sdp, rblocks, 0); |
449 | if (ret) | |
450 | goto out_trans_fail; | |
451 | ||
452 | lock_page(page); | |
453 | ret = -EINVAL; | |
13d921e3 SW |
454 | size = i_size_read(inode); |
455 | last_index = (size - 1) >> PAGE_CACHE_SHIFT; | |
456 | /* Check page index against inode size */ | |
457 | if (size == 0 || (page->index > last_index)) | |
458 | goto out_trans_end; | |
459 | ||
460 | ret = -EAGAIN; | |
461 | /* If truncated, we must retry the operation, we may have raced | |
462 | * with the glock demotion code. | |
463 | */ | |
464 | if (!PageUptodate(page) || page->mapping != inode->i_mapping) | |
465 | goto out_trans_end; | |
466 | ||
467 | /* Unstuff, if required, and allocate backing blocks for page */ | |
b7fe2e39 | 468 | ret = 0; |
13d921e3 | 469 | if (gfs2_is_stuffed(ip)) |
3cc3f710 | 470 | ret = gfs2_unstuff_dinode(ip, page); |
13d921e3 SW |
471 | if (ret == 0) |
472 | ret = gfs2_allocate_page_backing(page); | |
3cc3f710 | 473 | |
13d921e3 SW |
474 | out_trans_end: |
475 | if (ret) | |
476 | unlock_page(page); | |
3cc3f710 SW |
477 | gfs2_trans_end(sdp); |
478 | out_trans_fail: | |
479 | gfs2_inplace_release(ip); | |
480 | out_quota_unlock: | |
481 | gfs2_quota_unlock(ip); | |
3cc3f710 SW |
482 | out_unlock: |
483 | gfs2_glock_dq(&gh); | |
2b3dcf35 | 484 | out_uninit: |
3cc3f710 | 485 | gfs2_holder_uninit(&gh); |
13d921e3 SW |
486 | if (ret == 0) { |
487 | set_page_dirty(page); | |
1d1d1a76 | 488 | wait_for_stable_page(page); |
13d921e3 | 489 | } |
2b3dcf35 BP |
490 | out_write_access: |
491 | put_write_access(inode); | |
492 | out: | |
39263d5e | 493 | sb_end_pagefault(inode->i_sb); |
13d921e3 | 494 | return block_page_mkwrite_return(ret); |
3cc3f710 SW |
495 | } |
496 | ||
f0f37e2f | 497 | static const struct vm_operations_struct gfs2_vm_ops = { |
3cc3f710 | 498 | .fault = filemap_fault, |
f1820361 | 499 | .map_pages = filemap_map_pages, |
3cc3f710 SW |
500 | .page_mkwrite = gfs2_page_mkwrite, |
501 | }; | |
502 | ||
b3b94faa DT |
503 | /** |
504 | * gfs2_mmap - | |
505 | * @file: The file to map | |
506 | * @vma: The VMA which described the mapping | |
507 | * | |
48bf2b17 SW |
508 | * There is no need to get a lock here unless we should be updating |
509 | * atime. We ignore any locking errors since the only consequence is | |
510 | * a missed atime update (which will just be deferred until later). | |
511 | * | |
512 | * Returns: 0 | |
b3b94faa DT |
513 | */ |
514 | ||
515 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
516 | { | |
feaa7bba | 517 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa | 518 | |
b9c93bb7 SW |
519 | if (!(file->f_flags & O_NOATIME) && |
520 | !IS_NOATIME(&ip->i_inode)) { | |
48bf2b17 SW |
521 | struct gfs2_holder i_gh; |
522 | int error; | |
b3b94faa | 523 | |
3d162688 BM |
524 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
525 | &i_gh); | |
b9c93bb7 SW |
526 | if (error) |
527 | return error; | |
3d162688 BM |
528 | /* grab lock to update inode */ |
529 | gfs2_glock_dq_uninit(&i_gh); | |
530 | file_accessed(file); | |
48bf2b17 | 531 | } |
3cc3f710 | 532 | vma->vm_ops = &gfs2_vm_ops; |
b3b94faa | 533 | |
48bf2b17 | 534 | return 0; |
b3b94faa DT |
535 | } |
536 | ||
537 | /** | |
6d4ade98 SW |
538 | * gfs2_open_common - This is common to open and atomic_open |
539 | * @inode: The inode being opened | |
540 | * @file: The file being opened | |
b3b94faa | 541 | * |
6d4ade98 SW |
542 | * This maybe called under a glock or not depending upon how it has |
543 | * been called. We must always be called under a glock for regular | |
544 | * files, however. For other file types, it does not matter whether | |
545 | * we hold the glock or not. | |
546 | * | |
547 | * Returns: Error code or 0 for success | |
b3b94faa DT |
548 | */ |
549 | ||
6d4ade98 | 550 | int gfs2_open_common(struct inode *inode, struct file *file) |
b3b94faa | 551 | { |
b3b94faa | 552 | struct gfs2_file *fp; |
6d4ade98 SW |
553 | int ret; |
554 | ||
555 | if (S_ISREG(inode->i_mode)) { | |
556 | ret = generic_file_open(inode, file); | |
557 | if (ret) | |
558 | return ret; | |
559 | } | |
b3b94faa | 560 | |
6d4ade98 | 561 | fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS); |
b3b94faa DT |
562 | if (!fp) |
563 | return -ENOMEM; | |
564 | ||
f55ab26a | 565 | mutex_init(&fp->f_fl_mutex); |
b3b94faa | 566 | |
feaa7bba | 567 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
5c676f6d | 568 | file->private_data = fp; |
6d4ade98 SW |
569 | return 0; |
570 | } | |
571 | ||
572 | /** | |
573 | * gfs2_open - open a file | |
574 | * @inode: the inode to open | |
575 | * @file: the struct file for this opening | |
576 | * | |
577 | * After atomic_open, this function is only used for opening files | |
578 | * which are already cached. We must still get the glock for regular | |
579 | * files to ensure that we have the file size uptodate for the large | |
580 | * file check which is in the common code. That is only an issue for | |
581 | * regular files though. | |
582 | * | |
583 | * Returns: errno | |
584 | */ | |
585 | ||
586 | static int gfs2_open(struct inode *inode, struct file *file) | |
587 | { | |
588 | struct gfs2_inode *ip = GFS2_I(inode); | |
589 | struct gfs2_holder i_gh; | |
590 | int error; | |
591 | bool need_unlock = false; | |
b3b94faa | 592 | |
b60623c2 | 593 | if (S_ISREG(ip->i_inode.i_mode)) { |
b3b94faa DT |
594 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
595 | &i_gh); | |
596 | if (error) | |
6d4ade98 SW |
597 | return error; |
598 | need_unlock = true; | |
599 | } | |
b3b94faa | 600 | |
6d4ade98 | 601 | error = gfs2_open_common(inode, file); |
b3b94faa | 602 | |
6d4ade98 | 603 | if (need_unlock) |
b3b94faa | 604 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa | 605 | |
b3b94faa DT |
606 | return error; |
607 | } | |
608 | ||
609 | /** | |
df3fd117 | 610 | * gfs2_release - called to close a struct file |
b3b94faa DT |
611 | * @inode: the inode the struct file belongs to |
612 | * @file: the struct file being closed | |
613 | * | |
614 | * Returns: errno | |
615 | */ | |
616 | ||
df3fd117 | 617 | static int gfs2_release(struct inode *inode, struct file *file) |
b3b94faa | 618 | { |
0a305e49 | 619 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 620 | |
8e2e0047 | 621 | kfree(file->private_data); |
5c676f6d | 622 | file->private_data = NULL; |
b3b94faa | 623 | |
2b3dcf35 BP |
624 | if (!(file->f_mode & FMODE_WRITE)) |
625 | return 0; | |
0a305e49 | 626 | |
af5c2697 | 627 | gfs2_rs_delete(ip, &inode->i_writecount); |
b3b94faa DT |
628 | return 0; |
629 | } | |
630 | ||
631 | /** | |
632 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
02c24a82 JB |
633 | * @file: the file that points to the dentry |
634 | * @start: the start position in the file to sync | |
635 | * @end: the end position in the file to sync | |
dba898b0 | 636 | * @datasync: set if we can ignore timestamp changes |
b3b94faa | 637 | * |
2f0264d5 SW |
638 | * We split the data flushing here so that we don't wait for the data |
639 | * until after we've also sent the metadata to disk. Note that for | |
640 | * data=ordered, we will write & wait for the data at the log flush | |
641 | * stage anyway, so this is unlikely to make much of a difference | |
642 | * except in the data=writeback case. | |
643 | * | |
644 | * If the fdatawrite fails due to any reason except -EIO, we will | |
645 | * continue the remainder of the fsync, although we'll still report | |
646 | * the error at the end. This is to match filemap_write_and_wait_range() | |
647 | * behaviour. | |
34126f9f | 648 | * |
b3b94faa DT |
649 | * Returns: errno |
650 | */ | |
651 | ||
02c24a82 JB |
652 | static int gfs2_fsync(struct file *file, loff_t start, loff_t end, |
653 | int datasync) | |
b3b94faa | 654 | { |
2f0264d5 SW |
655 | struct address_space *mapping = file->f_mapping; |
656 | struct inode *inode = mapping->host; | |
0ae45f63 | 657 | int sync_state = inode->i_state & I_DIRTY_ALL; |
dba898b0 | 658 | struct gfs2_inode *ip = GFS2_I(inode); |
87654896 | 659 | int ret = 0, ret1 = 0; |
b3b94faa | 660 | |
2f0264d5 SW |
661 | if (mapping->nrpages) { |
662 | ret1 = filemap_fdatawrite_range(mapping, start, end); | |
663 | if (ret1 == -EIO) | |
664 | return ret1; | |
665 | } | |
02c24a82 | 666 | |
0c901809 BM |
667 | if (!gfs2_is_jdata(ip)) |
668 | sync_state &= ~I_DIRTY_PAGES; | |
dba898b0 | 669 | if (datasync) |
0ae45f63 | 670 | sync_state &= ~(I_DIRTY_SYNC | I_DIRTY_TIME); |
b3b94faa | 671 | |
dba898b0 SW |
672 | if (sync_state) { |
673 | ret = sync_inode_metadata(inode, 1); | |
b5b24d7a | 674 | if (ret) |
dba898b0 | 675 | return ret; |
f1818529 SW |
676 | if (gfs2_is_jdata(ip)) |
677 | filemap_write_and_wait(mapping); | |
b5b24d7a | 678 | gfs2_ail_flush(ip->i_gl, 1); |
33c3de32 SW |
679 | } |
680 | ||
2f0264d5 SW |
681 | if (mapping->nrpages) |
682 | ret = filemap_fdatawait_range(mapping, start, end); | |
683 | ||
684 | return ret ? ret : ret1; | |
b3b94faa DT |
685 | } |
686 | ||
56aa616a | 687 | /** |
da56e45b | 688 | * gfs2_file_write_iter - Perform a write to a file |
56aa616a SW |
689 | * @iocb: The io context |
690 | * @iov: The data to write | |
691 | * @nr_segs: Number of @iov segments | |
692 | * @pos: The file position | |
693 | * | |
694 | * We have to do a lock/unlock here to refresh the inode size for | |
695 | * O_APPEND writes, otherwise we can land up writing at the wrong | |
696 | * offset. There is still a race, but provided the app is using its | |
697 | * own file locking, this will make O_APPEND work as expected. | |
698 | * | |
699 | */ | |
700 | ||
da56e45b | 701 | static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
56aa616a SW |
702 | { |
703 | struct file *file = iocb->ki_filp; | |
496ad9aa | 704 | struct gfs2_inode *ip = GFS2_I(file_inode(file)); |
0a305e49 BP |
705 | int ret; |
706 | ||
707 | ret = gfs2_rs_alloc(ip); | |
708 | if (ret) | |
709 | return ret; | |
56aa616a | 710 | |
da56e45b | 711 | gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from)); |
da1dfb6a | 712 | |
56aa616a | 713 | if (file->f_flags & O_APPEND) { |
56aa616a | 714 | struct gfs2_holder gh; |
56aa616a SW |
715 | |
716 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
717 | if (ret) | |
718 | return ret; | |
719 | gfs2_glock_dq_uninit(&gh); | |
720 | } | |
721 | ||
da56e45b | 722 | return generic_file_write_iter(iocb, from); |
56aa616a SW |
723 | } |
724 | ||
2fe17c10 CH |
725 | static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len, |
726 | int mode) | |
727 | { | |
728 | struct gfs2_inode *ip = GFS2_I(inode); | |
729 | struct buffer_head *dibh; | |
730 | int error; | |
64dd153c BM |
731 | unsigned int nr_blks; |
732 | sector_t lblock = offset >> inode->i_blkbits; | |
2fe17c10 CH |
733 | |
734 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
735 | if (unlikely(error)) | |
64dd153c | 736 | return error; |
2fe17c10 | 737 | |
350a9b0a | 738 | gfs2_trans_add_meta(ip->i_gl, dibh); |
2fe17c10 CH |
739 | |
740 | if (gfs2_is_stuffed(ip)) { | |
741 | error = gfs2_unstuff_dinode(ip, NULL); | |
742 | if (unlikely(error)) | |
743 | goto out; | |
744 | } | |
745 | ||
64dd153c BM |
746 | while (len) { |
747 | struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; | |
748 | bh_map.b_size = len; | |
749 | set_buffer_zeronew(&bh_map); | |
2fe17c10 | 750 | |
64dd153c BM |
751 | error = gfs2_block_map(inode, lblock, &bh_map, 1); |
752 | if (unlikely(error)) | |
753 | goto out; | |
754 | len -= bh_map.b_size; | |
755 | nr_blks = bh_map.b_size >> inode->i_blkbits; | |
756 | lblock += nr_blks; | |
757 | if (!buffer_new(&bh_map)) | |
758 | continue; | |
759 | if (unlikely(!buffer_zeronew(&bh_map))) { | |
760 | error = -EIO; | |
2fe17c10 | 761 | goto out; |
64dd153c | 762 | } |
2fe17c10 | 763 | } |
2fe17c10 | 764 | out: |
64dd153c | 765 | brelse(dibh); |
2fe17c10 CH |
766 | return error; |
767 | } | |
768 | ||
769 | static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len, | |
770 | unsigned int *data_blocks, unsigned int *ind_blocks) | |
771 | { | |
772 | const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); | |
54335b1f | 773 | unsigned int max_blocks = ip->i_rgd->rd_free_clone; |
2fe17c10 CH |
774 | unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1); |
775 | ||
776 | for (tmp = max_data; tmp > sdp->sd_diptrs;) { | |
777 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); | |
778 | max_data -= tmp; | |
779 | } | |
780 | /* This calculation isn't the exact reverse of gfs2_write_calc_reserve, | |
781 | so it might end up with fewer data blocks */ | |
782 | if (max_data <= *data_blocks) | |
783 | return; | |
784 | *data_blocks = max_data; | |
785 | *ind_blocks = max_blocks - max_data; | |
786 | *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift; | |
787 | if (*len > max) { | |
788 | *len = max; | |
789 | gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks); | |
790 | } | |
791 | } | |
792 | ||
9c9f1159 | 793 | static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len) |
2fe17c10 | 794 | { |
496ad9aa | 795 | struct inode *inode = file_inode(file); |
2fe17c10 CH |
796 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
797 | struct gfs2_inode *ip = GFS2_I(inode); | |
7b9cff46 | 798 | struct gfs2_alloc_parms ap = { .aflags = 0, }; |
2fe17c10 CH |
799 | unsigned int data_blocks = 0, ind_blocks = 0, rblocks; |
800 | loff_t bytes, max_bytes; | |
2fe17c10 | 801 | int error; |
4442f2e0 SW |
802 | const loff_t pos = offset; |
803 | const loff_t count = len; | |
6905d9e4 | 804 | loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1); |
2fe17c10 | 805 | loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift; |
64dd153c | 806 | loff_t max_chunk_size = UINT_MAX & bsize_mask; |
a0846a53 | 807 | |
2fe17c10 CH |
808 | next = (next + 1) << sdp->sd_sb.sb_bsize_shift; |
809 | ||
6905d9e4 | 810 | offset &= bsize_mask; |
2fe17c10 CH |
811 | |
812 | len = next - offset; | |
813 | bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2; | |
814 | if (!bytes) | |
815 | bytes = UINT_MAX; | |
6905d9e4 BM |
816 | bytes &= bsize_mask; |
817 | if (bytes == 0) | |
818 | bytes = sdp->sd_sb.sb_bsize; | |
2fe17c10 | 819 | |
da1dfb6a | 820 | gfs2_size_hint(file, offset, len); |
8e2e0047 | 821 | |
2fe17c10 CH |
822 | while (len > 0) { |
823 | if (len < bytes) | |
824 | bytes = len; | |
58a7d5fb BM |
825 | if (!gfs2_write_alloc_required(ip, offset, bytes)) { |
826 | len -= bytes; | |
827 | offset += bytes; | |
828 | continue; | |
829 | } | |
2fe17c10 CH |
830 | error = gfs2_quota_lock_check(ip); |
831 | if (error) | |
9c9f1159 | 832 | return error; |
2fe17c10 CH |
833 | retry: |
834 | gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks); | |
835 | ||
7b9cff46 SW |
836 | ap.target = data_blocks + ind_blocks; |
837 | error = gfs2_inplace_reserve(ip, &ap); | |
2fe17c10 CH |
838 | if (error) { |
839 | if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) { | |
840 | bytes >>= 1; | |
6905d9e4 BM |
841 | bytes &= bsize_mask; |
842 | if (bytes == 0) | |
843 | bytes = sdp->sd_sb.sb_bsize; | |
2fe17c10 CH |
844 | goto retry; |
845 | } | |
846 | goto out_qunlock; | |
847 | } | |
848 | max_bytes = bytes; | |
64dd153c BM |
849 | calc_max_reserv(ip, (len > max_chunk_size)? max_chunk_size: len, |
850 | &max_bytes, &data_blocks, &ind_blocks); | |
2fe17c10 CH |
851 | |
852 | rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA + | |
71f890f7 | 853 | RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks); |
2fe17c10 CH |
854 | if (gfs2_is_jdata(ip)) |
855 | rblocks += data_blocks ? data_blocks : 1; | |
856 | ||
857 | error = gfs2_trans_begin(sdp, rblocks, | |
858 | PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); | |
859 | if (error) | |
860 | goto out_trans_fail; | |
861 | ||
862 | error = fallocate_chunk(inode, offset, max_bytes, mode); | |
863 | gfs2_trans_end(sdp); | |
864 | ||
865 | if (error) | |
866 | goto out_trans_fail; | |
867 | ||
868 | len -= max_bytes; | |
869 | offset += max_bytes; | |
870 | gfs2_inplace_release(ip); | |
871 | gfs2_quota_unlock(ip); | |
2fe17c10 | 872 | } |
4442f2e0 | 873 | |
1885867b AP |
874 | if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size) { |
875 | i_size_write(inode, pos + count); | |
98f1a696 AP |
876 | /* Marks the inode as dirty */ |
877 | file_update_time(file); | |
1885867b AP |
878 | } |
879 | ||
880 | return generic_write_sync(file, pos, count); | |
2fe17c10 CH |
881 | |
882 | out_trans_fail: | |
883 | gfs2_inplace_release(ip); | |
884 | out_qunlock: | |
885 | gfs2_quota_unlock(ip); | |
9c9f1159 AP |
886 | return error; |
887 | } | |
888 | ||
889 | static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len) | |
890 | { | |
891 | struct inode *inode = file_inode(file); | |
892 | struct gfs2_inode *ip = GFS2_I(inode); | |
893 | struct gfs2_holder gh; | |
894 | int ret; | |
895 | ||
896 | if (mode & ~FALLOC_FL_KEEP_SIZE) | |
897 | return -EOPNOTSUPP; | |
898 | ||
899 | mutex_lock(&inode->i_mutex); | |
900 | ||
901 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
902 | ret = gfs2_glock_nq(&gh); | |
903 | if (ret) | |
904 | goto out_uninit; | |
905 | ||
906 | if (!(mode & FALLOC_FL_KEEP_SIZE) && | |
907 | (offset + len) > inode->i_size) { | |
908 | ret = inode_newsize_ok(inode, offset + len); | |
909 | if (ret) | |
910 | goto out_unlock; | |
911 | } | |
912 | ||
913 | ret = get_write_access(inode); | |
914 | if (ret) | |
915 | goto out_unlock; | |
916 | ||
917 | ret = gfs2_rs_alloc(ip); | |
918 | if (ret) | |
919 | goto out_putw; | |
920 | ||
921 | ret = __gfs2_fallocate(file, mode, offset, len); | |
922 | if (ret) | |
923 | gfs2_rs_deltree(ip->i_res); | |
924 | out_putw: | |
925 | put_write_access(inode); | |
2fe17c10 | 926 | out_unlock: |
a0846a53 | 927 | gfs2_glock_dq(&gh); |
2fe17c10 | 928 | out_uninit: |
a0846a53 BP |
929 | gfs2_holder_uninit(&gh); |
930 | mutex_unlock(&inode->i_mutex); | |
9c9f1159 | 931 | return ret; |
2fe17c10 CH |
932 | } |
933 | ||
f057f6cd SW |
934 | #ifdef CONFIG_GFS2_FS_LOCKING_DLM |
935 | ||
b3b94faa DT |
936 | /** |
937 | * gfs2_lock - acquire/release a posix lock on a file | |
938 | * @file: the file pointer | |
939 | * @cmd: either modify or retrieve lock state, possibly wait | |
940 | * @fl: type and range of lock | |
941 | * | |
942 | * Returns: errno | |
943 | */ | |
944 | ||
945 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
946 | { | |
feaa7bba SW |
947 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
948 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
f057f6cd | 949 | struct lm_lockstruct *ls = &sdp->sd_lockstruct; |
b3b94faa | 950 | |
b3b94faa DT |
951 | if (!(fl->fl_flags & FL_POSIX)) |
952 | return -ENOLCK; | |
720e7749 | 953 | if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK) |
b3b94faa DT |
954 | return -ENOLCK; |
955 | ||
586759f0 ME |
956 | if (cmd == F_CANCELLK) { |
957 | /* Hack: */ | |
958 | cmd = F_SETLK; | |
959 | fl->fl_type = F_UNLCK; | |
960 | } | |
c2952d20 SW |
961 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) { |
962 | if (fl->fl_type == F_UNLCK) | |
963 | posix_lock_file_wait(file, fl); | |
f057f6cd | 964 | return -EIO; |
c2952d20 | 965 | } |
b3b94faa | 966 | if (IS_GETLK(cmd)) |
f057f6cd | 967 | return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); |
b3b94faa | 968 | else if (fl->fl_type == F_UNLCK) |
f057f6cd | 969 | return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); |
b3b94faa | 970 | else |
f057f6cd | 971 | return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); |
b3b94faa DT |
972 | } |
973 | ||
b3b94faa DT |
974 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
975 | { | |
5c676f6d | 976 | struct gfs2_file *fp = file->private_data; |
b3b94faa | 977 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
496ad9aa | 978 | struct gfs2_inode *ip = GFS2_I(file_inode(file)); |
b3b94faa DT |
979 | struct gfs2_glock *gl; |
980 | unsigned int state; | |
981 | int flags; | |
982 | int error = 0; | |
2ddfbdd6 | 983 | int sleeptime; |
b3b94faa DT |
984 | |
985 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
2ddfbdd6 | 986 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT; |
b3b94faa | 987 | |
f55ab26a | 988 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa DT |
989 | |
990 | gl = fl_gh->gh_gl; | |
991 | if (gl) { | |
992 | if (fl_gh->gh_state == state) | |
993 | goto out; | |
b3b94faa | 994 | flock_lock_file_wait(file, |
907b9bce | 995 | &(struct file_lock){.fl_type = F_UNLCK}); |
5bef3e7c | 996 | gfs2_glock_dq(fl_gh); |
b4c20166 | 997 | gfs2_holder_reinit(state, flags, fl_gh); |
b3b94faa | 998 | } else { |
6802e340 SW |
999 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, |
1000 | &gfs2_flock_glops, CREATE, &gl); | |
b3b94faa DT |
1001 | if (error) |
1002 | goto out; | |
b4c20166 AD |
1003 | gfs2_holder_init(gl, state, flags, fl_gh); |
1004 | gfs2_glock_put(gl); | |
b3b94faa | 1005 | } |
2ddfbdd6 BP |
1006 | for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) { |
1007 | error = gfs2_glock_nq(fl_gh); | |
1008 | if (error != GLR_TRYFAILED) | |
1009 | break; | |
1010 | fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT; | |
1011 | fl_gh->gh_error = 0; | |
1012 | msleep(sleeptime); | |
1013 | } | |
b3b94faa DT |
1014 | if (error) { |
1015 | gfs2_holder_uninit(fl_gh); | |
1016 | if (error == GLR_TRYFAILED) | |
1017 | error = -EAGAIN; | |
1018 | } else { | |
1019 | error = flock_lock_file_wait(file, fl); | |
feaa7bba | 1020 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
b3b94faa DT |
1021 | } |
1022 | ||
420b9e5e | 1023 | out: |
f55ab26a | 1024 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
1025 | return error; |
1026 | } | |
1027 | ||
1028 | static void do_unflock(struct file *file, struct file_lock *fl) | |
1029 | { | |
5c676f6d | 1030 | struct gfs2_file *fp = file->private_data; |
b3b94faa DT |
1031 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
1032 | ||
f55ab26a | 1033 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa | 1034 | flock_lock_file_wait(file, fl); |
0a33443b | 1035 | if (fl_gh->gh_gl) { |
2ddfbdd6 | 1036 | gfs2_glock_dq(fl_gh); |
0a33443b SW |
1037 | gfs2_holder_uninit(fl_gh); |
1038 | } | |
f55ab26a | 1039 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
1040 | } |
1041 | ||
1042 | /** | |
1043 | * gfs2_flock - acquire/release a flock lock on a file | |
1044 | * @file: the file pointer | |
1045 | * @cmd: either modify or retrieve lock state, possibly wait | |
1046 | * @fl: type and range of lock | |
1047 | * | |
1048 | * Returns: errno | |
1049 | */ | |
1050 | ||
1051 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
1052 | { | |
b3b94faa DT |
1053 | if (!(fl->fl_flags & FL_FLOCK)) |
1054 | return -ENOLCK; | |
a12af1eb AD |
1055 | if (fl->fl_type & LOCK_MAND) |
1056 | return -EOPNOTSUPP; | |
b3b94faa | 1057 | |
b3b94faa DT |
1058 | if (fl->fl_type == F_UNLCK) { |
1059 | do_unflock(file, fl); | |
1060 | return 0; | |
d00223f1 | 1061 | } else { |
b3b94faa | 1062 | return do_flock(file, cmd, fl); |
d00223f1 | 1063 | } |
b3b94faa DT |
1064 | } |
1065 | ||
10d21988 | 1066 | const struct file_operations gfs2_file_fops = { |
26c1a574 | 1067 | .llseek = gfs2_llseek, |
aad4f8bb AV |
1068 | .read = new_sync_read, |
1069 | .read_iter = generic_file_read_iter, | |
da56e45b AV |
1070 | .write = new_sync_write, |
1071 | .write_iter = gfs2_file_write_iter, | |
26c1a574 SW |
1072 | .unlocked_ioctl = gfs2_ioctl, |
1073 | .mmap = gfs2_mmap, | |
1074 | .open = gfs2_open, | |
df3fd117 | 1075 | .release = gfs2_release, |
26c1a574 SW |
1076 | .fsync = gfs2_fsync, |
1077 | .lock = gfs2_lock, | |
26c1a574 SW |
1078 | .flock = gfs2_flock, |
1079 | .splice_read = generic_file_splice_read, | |
8d020765 | 1080 | .splice_write = iter_file_splice_write, |
1c994a09 | 1081 | .setlease = simple_nosetlease, |
2fe17c10 | 1082 | .fallocate = gfs2_fallocate, |
b3b94faa DT |
1083 | }; |
1084 | ||
10d21988 | 1085 | const struct file_operations gfs2_dir_fops = { |
d81a8ef5 | 1086 | .iterate = gfs2_readdir, |
26c1a574 SW |
1087 | .unlocked_ioctl = gfs2_ioctl, |
1088 | .open = gfs2_open, | |
df3fd117 | 1089 | .release = gfs2_release, |
26c1a574 SW |
1090 | .fsync = gfs2_fsync, |
1091 | .lock = gfs2_lock, | |
1092 | .flock = gfs2_flock, | |
6038f373 | 1093 | .llseek = default_llseek, |
b3b94faa DT |
1094 | }; |
1095 | ||
f057f6cd SW |
1096 | #endif /* CONFIG_GFS2_FS_LOCKING_DLM */ |
1097 | ||
10d21988 | 1098 | const struct file_operations gfs2_file_fops_nolock = { |
c97bfe43 | 1099 | .llseek = gfs2_llseek, |
aad4f8bb AV |
1100 | .read = new_sync_read, |
1101 | .read_iter = generic_file_read_iter, | |
da56e45b AV |
1102 | .write = new_sync_write, |
1103 | .write_iter = gfs2_file_write_iter, | |
c97bfe43 WC |
1104 | .unlocked_ioctl = gfs2_ioctl, |
1105 | .mmap = gfs2_mmap, | |
1106 | .open = gfs2_open, | |
df3fd117 | 1107 | .release = gfs2_release, |
c97bfe43 WC |
1108 | .fsync = gfs2_fsync, |
1109 | .splice_read = generic_file_splice_read, | |
8d020765 | 1110 | .splice_write = iter_file_splice_write, |
f057f6cd | 1111 | .setlease = generic_setlease, |
2fe17c10 | 1112 | .fallocate = gfs2_fallocate, |
c97bfe43 WC |
1113 | }; |
1114 | ||
10d21988 | 1115 | const struct file_operations gfs2_dir_fops_nolock = { |
d81a8ef5 | 1116 | .iterate = gfs2_readdir, |
c97bfe43 WC |
1117 | .unlocked_ioctl = gfs2_ioctl, |
1118 | .open = gfs2_open, | |
df3fd117 | 1119 | .release = gfs2_release, |
c97bfe43 | 1120 | .fsync = gfs2_fsync, |
6038f373 | 1121 | .llseek = default_llseek, |
c97bfe43 WC |
1122 | }; |
1123 |