Commit | Line | Data |
---|---|---|
7336d0e6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b3b94faa DT |
2 | /* |
3 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 4 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
5 | */ |
6 | ||
b3b94faa DT |
7 | #include <linux/slab.h> |
8 | #include <linux/spinlock.h> | |
9 | #include <linux/completion.h> | |
10 | #include <linux/buffer_head.h> | |
11 | #include <linux/pagemap.h> | |
12 | #include <linux/uio.h> | |
13 | #include <linux/blkdev.h> | |
14 | #include <linux/mm.h> | |
f58ba889 | 15 | #include <linux/mount.h> |
18ec7d5c | 16 | #include <linux/fs.h> |
5c676f6d | 17 | #include <linux/gfs2_ondisk.h> |
2fe17c10 CH |
18 | #include <linux/falloc.h> |
19 | #include <linux/swap.h> | |
71b86f56 | 20 | #include <linux/crc32.h> |
33c3de32 | 21 | #include <linux/writeback.h> |
7c0f6ba6 | 22 | #include <linux/uaccess.h> |
f057f6cd SW |
23 | #include <linux/dlm.h> |
24 | #include <linux/dlm_plock.h> | |
2ddfbdd6 | 25 | #include <linux/delay.h> |
64bc06bb | 26 | #include <linux/backing-dev.h> |
b3b94faa DT |
27 | |
28 | #include "gfs2.h" | |
5c676f6d | 29 | #include "incore.h" |
b3b94faa | 30 | #include "bmap.h" |
64bc06bb | 31 | #include "aops.h" |
b3b94faa DT |
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) { |
3a27411c | 62 | case SEEK_END: |
b3b94faa DT |
63 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
64 | &i_gh); | |
65 | if (!error) { | |
965c8e59 | 66 | error = generic_file_llseek(file, offset, whence); |
b3b94faa DT |
67 | gfs2_glock_dq_uninit(&i_gh); |
68 | } | |
9453615a | 69 | break; |
3a27411c AG |
70 | |
71 | case SEEK_DATA: | |
72 | error = gfs2_seek_data(file, offset); | |
73 | break; | |
74 | ||
75 | case SEEK_HOLE: | |
76 | error = gfs2_seek_hole(file, offset); | |
77 | break; | |
78 | ||
9453615a SW |
79 | case SEEK_CUR: |
80 | case SEEK_SET: | |
3a27411c AG |
81 | /* |
82 | * These don't reference inode->i_size and don't depend on the | |
83 | * block mapping, so we don't need the glock. | |
84 | */ | |
965c8e59 | 85 | error = generic_file_llseek(file, offset, whence); |
9453615a SW |
86 | break; |
87 | default: | |
88 | error = -EINVAL; | |
89 | } | |
b3b94faa DT |
90 | |
91 | return error; | |
92 | } | |
93 | ||
b3b94faa | 94 | /** |
d81a8ef5 | 95 | * gfs2_readdir - Iterator for a directory |
b3b94faa | 96 | * @file: The directory to read from |
d81a8ef5 | 97 | * @ctx: What to feed directory entries to |
b3b94faa DT |
98 | * |
99 | * Returns: errno | |
100 | */ | |
101 | ||
d81a8ef5 | 102 | static int gfs2_readdir(struct file *file, struct dir_context *ctx) |
b3b94faa | 103 | { |
71b86f56 | 104 | struct inode *dir = file->f_mapping->host; |
feaa7bba | 105 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 106 | struct gfs2_holder d_gh; |
b3b94faa DT |
107 | int error; |
108 | ||
d81a8ef5 AV |
109 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
110 | if (error) | |
b3b94faa | 111 | return error; |
b3b94faa | 112 | |
d81a8ef5 | 113 | error = gfs2_dir_read(dir, ctx, &file->f_ra); |
b3b94faa DT |
114 | |
115 | gfs2_glock_dq_uninit(&d_gh); | |
116 | ||
b3b94faa DT |
117 | return error; |
118 | } | |
119 | ||
128e5eba | 120 | /** |
b16f7e57 | 121 | * fsflag_gfs2flag |
128e5eba | 122 | * |
b16f7e57 AG |
123 | * The FS_JOURNAL_DATA_FL flag maps to GFS2_DIF_INHERIT_JDATA for directories, |
124 | * and to GFS2_DIF_JDATA for non-directories. | |
128e5eba | 125 | */ |
b16f7e57 AG |
126 | static struct { |
127 | u32 fsflag; | |
128 | u32 gfsflag; | |
129 | } fsflag_gfs2flag[] = { | |
130 | {FS_SYNC_FL, GFS2_DIF_SYNC}, | |
131 | {FS_IMMUTABLE_FL, GFS2_DIF_IMMUTABLE}, | |
132 | {FS_APPEND_FL, GFS2_DIF_APPENDONLY}, | |
133 | {FS_NOATIME_FL, GFS2_DIF_NOATIME}, | |
134 | {FS_INDEX_FL, GFS2_DIF_EXHASH}, | |
135 | {FS_TOPDIR_FL, GFS2_DIF_TOPDIR}, | |
136 | {FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA}, | |
7ea9ea83 | 137 | }; |
71b86f56 | 138 | |
b09e593d | 139 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 140 | { |
496ad9aa | 141 | struct inode *inode = file_inode(filp); |
feaa7bba | 142 | struct gfs2_inode *ip = GFS2_I(inode); |
71b86f56 | 143 | struct gfs2_holder gh; |
b16f7e57 AG |
144 | int i, error; |
145 | u32 gfsflags, fsflags = 0; | |
71b86f56 | 146 | |
719ee344 SW |
147 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
148 | error = gfs2_glock_nq(&gh); | |
71b86f56 | 149 | if (error) |
9c7fe835 | 150 | goto out_uninit; |
907b9bce | 151 | |
b16f7e57 AG |
152 | gfsflags = ip->i_diskflags; |
153 | if (S_ISDIR(inode->i_mode)) | |
154 | gfsflags &= ~GFS2_DIF_JDATA; | |
155 | else | |
156 | gfsflags &= ~GFS2_DIF_INHERIT_JDATA; | |
157 | for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) | |
158 | if (gfsflags & fsflag_gfs2flag[i].gfsflag) | |
159 | fsflags |= fsflag_gfs2flag[i].fsflag; | |
160 | ||
128e5eba | 161 | if (put_user(fsflags, ptr)) |
71b86f56 SW |
162 | error = -EFAULT; |
163 | ||
3cc3f710 | 164 | gfs2_glock_dq(&gh); |
9c7fe835 | 165 | out_uninit: |
71b86f56 SW |
166 | gfs2_holder_uninit(&gh); |
167 | return error; | |
168 | } | |
169 | ||
6b124d8d SW |
170 | void gfs2_set_inode_flags(struct inode *inode) |
171 | { | |
172 | struct gfs2_inode *ip = GFS2_I(inode); | |
6b124d8d SW |
173 | unsigned int flags = inode->i_flags; |
174 | ||
9964afbb SW |
175 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC); |
176 | if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode)) | |
01e64ee4 | 177 | flags |= S_NOSEC; |
383f01fb | 178 | if (ip->i_diskflags & GFS2_DIF_IMMUTABLE) |
6b124d8d | 179 | flags |= S_IMMUTABLE; |
383f01fb | 180 | if (ip->i_diskflags & GFS2_DIF_APPENDONLY) |
6b124d8d | 181 | flags |= S_APPEND; |
383f01fb | 182 | if (ip->i_diskflags & GFS2_DIF_NOATIME) |
6b124d8d | 183 | flags |= S_NOATIME; |
383f01fb | 184 | if (ip->i_diskflags & GFS2_DIF_SYNC) |
6b124d8d SW |
185 | flags |= S_SYNC; |
186 | inode->i_flags = flags; | |
187 | } | |
188 | ||
71b86f56 SW |
189 | /* Flags that can be set by user space */ |
190 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
71b86f56 SW |
191 | GFS2_DIF_IMMUTABLE| \ |
192 | GFS2_DIF_APPENDONLY| \ | |
193 | GFS2_DIF_NOATIME| \ | |
194 | GFS2_DIF_SYNC| \ | |
23d0bb83 | 195 | GFS2_DIF_TOPDIR| \ |
71b86f56 SW |
196 | GFS2_DIF_INHERIT_JDATA) |
197 | ||
198 | /** | |
9dd868e1 FF |
199 | * do_gfs2_set_flags - set flags on an inode |
200 | * @filp: file pointer | |
201 | * @reqflags: The flags to set | |
71b86f56 SW |
202 | * @mask: Indicates which flags are valid |
203 | * | |
204 | */ | |
b09e593d | 205 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
71b86f56 | 206 | { |
496ad9aa | 207 | struct inode *inode = file_inode(filp); |
feaa7bba SW |
208 | struct gfs2_inode *ip = GFS2_I(inode); |
209 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
71b86f56 SW |
210 | struct buffer_head *bh; |
211 | struct gfs2_holder gh; | |
212 | int error; | |
55eccc6d | 213 | u32 new_flags, flags; |
71b86f56 | 214 | |
a561be71 | 215 | error = mnt_want_write_file(filp); |
52f341cf | 216 | if (error) |
71b86f56 SW |
217 | return error; |
218 | ||
f58ba889 MS |
219 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
220 | if (error) | |
221 | goto out_drop_write; | |
222 | ||
7df0e039 | 223 | error = -EACCES; |
2e149670 | 224 | if (!inode_owner_or_capable(inode)) |
7df0e039 SW |
225 | goto out; |
226 | ||
227 | error = 0; | |
383f01fb | 228 | flags = ip->i_diskflags; |
55eccc6d | 229 | new_flags = (flags & ~mask) | (reqflags & mask); |
71b86f56 SW |
230 | if ((new_flags ^ flags) == 0) |
231 | goto out; | |
232 | ||
71b86f56 SW |
233 | error = -EPERM; |
234 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
235 | goto out; | |
236 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
237 | goto out; | |
907b9bce | 238 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
b9cb9813 | 239 | !capable(CAP_LINUX_IMMUTABLE)) |
71b86f56 | 240 | goto out; |
b9cb9813 | 241 | if (!IS_IMMUTABLE(inode)) { |
10556cb2 | 242 | error = gfs2_permission(inode, MAY_WRITE); |
b9cb9813 SW |
243 | if (error) |
244 | goto out; | |
245 | } | |
5561093e | 246 | if ((flags ^ new_flags) & GFS2_DIF_JDATA) { |
cc555b09 | 247 | if (new_flags & GFS2_DIF_JDATA) |
c1696fb8 | 248 | gfs2_log_flush(sdp, ip->i_gl, |
805c0907 BP |
249 | GFS2_LOG_HEAD_FLUSH_NORMAL | |
250 | GFS2_LFC_SET_FLAGS); | |
5561093e SW |
251 | error = filemap_fdatawrite(inode->i_mapping); |
252 | if (error) | |
253 | goto out; | |
254 | error = filemap_fdatawait(inode->i_mapping); | |
255 | if (error) | |
256 | goto out; | |
cc555b09 BP |
257 | if (new_flags & GFS2_DIF_JDATA) |
258 | gfs2_ordered_del_inode(ip); | |
5561093e | 259 | } |
55eccc6d | 260 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
71b86f56 SW |
261 | if (error) |
262 | goto out; | |
55eccc6d SW |
263 | error = gfs2_meta_inode_buffer(ip, &bh); |
264 | if (error) | |
265 | goto out_trans_end; | |
9b7c2ddb | 266 | inode->i_ctime = current_time(inode); |
350a9b0a | 267 | gfs2_trans_add_meta(ip->i_gl, bh); |
383f01fb | 268 | ip->i_diskflags = new_flags; |
539e5d6b | 269 | gfs2_dinode_out(ip, bh->b_data); |
71b86f56 | 270 | brelse(bh); |
6b124d8d | 271 | gfs2_set_inode_flags(inode); |
5561093e | 272 | gfs2_set_aops(inode); |
55eccc6d SW |
273 | out_trans_end: |
274 | gfs2_trans_end(sdp); | |
71b86f56 SW |
275 | out: |
276 | gfs2_glock_dq_uninit(&gh); | |
f58ba889 | 277 | out_drop_write: |
2a79f17e | 278 | mnt_drop_write_file(filp); |
71b86f56 SW |
279 | return error; |
280 | } | |
281 | ||
b09e593d | 282 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
71b86f56 | 283 | { |
496ad9aa | 284 | struct inode *inode = file_inode(filp); |
b16f7e57 AG |
285 | u32 fsflags, gfsflags = 0; |
286 | u32 mask; | |
287 | int i; | |
7df0e039 | 288 | |
128e5eba | 289 | if (get_user(fsflags, ptr)) |
71b86f56 | 290 | return -EFAULT; |
7df0e039 | 291 | |
b16f7e57 AG |
292 | for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) { |
293 | if (fsflags & fsflag_gfs2flag[i].fsflag) { | |
294 | fsflags &= ~fsflag_gfs2flag[i].fsflag; | |
295 | gfsflags |= fsflag_gfs2flag[i].gfsflag; | |
296 | } | |
297 | } | |
298 | if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET) | |
299 | return -EINVAL; | |
300 | ||
301 | mask = GFS2_FLAGS_USER_SET; | |
302 | if (S_ISDIR(inode->i_mode)) { | |
303 | mask &= ~GFS2_DIF_JDATA; | |
304 | } else { | |
305 | /* The GFS2_DIF_TOPDIR flag is only valid for directories. */ | |
306 | if (gfsflags & GFS2_DIF_TOPDIR) | |
307 | return -EINVAL; | |
308 | mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA); | |
b9af7ca6 | 309 | } |
b16f7e57 AG |
310 | |
311 | return do_gfs2_set_flags(filp, gfsflags, mask); | |
71b86f56 SW |
312 | } |
313 | ||
6ddc5c3d SW |
314 | static int gfs2_getlabel(struct file *filp, char __user *label) |
315 | { | |
316 | struct inode *inode = file_inode(filp); | |
317 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
318 | ||
319 | if (copy_to_user(label, sdp->sd_sb.sb_locktable, GFS2_LOCKNAME_LEN)) | |
320 | return -EFAULT; | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
b09e593d | 325 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
71b86f56 SW |
326 | { |
327 | switch(cmd) { | |
128e5eba | 328 | case FS_IOC_GETFLAGS: |
b09e593d | 329 | return gfs2_get_flags(filp, (u32 __user *)arg); |
128e5eba | 330 | case FS_IOC_SETFLAGS: |
b09e593d | 331 | return gfs2_set_flags(filp, (u32 __user *)arg); |
66fc061b SW |
332 | case FITRIM: |
333 | return gfs2_fitrim(filp, (void __user *)arg); | |
6ddc5c3d SW |
334 | case FS_IOC_GETFSLABEL: |
335 | return gfs2_getlabel(filp, (char __user *)arg); | |
71b86f56 | 336 | } |
6ddc5c3d | 337 | |
71b86f56 SW |
338 | return -ENOTTY; |
339 | } | |
340 | ||
da1dfb6a SW |
341 | /** |
342 | * gfs2_size_hint - Give a hint to the size of a write request | |
9dd868e1 | 343 | * @filep: The struct file |
da1dfb6a SW |
344 | * @offset: The file offset of the write |
345 | * @size: The length of the write | |
346 | * | |
347 | * When we are about to do a write, this function records the total | |
348 | * write size in order to provide a suitable hint to the lower layers | |
349 | * about how many blocks will be required. | |
350 | * | |
351 | */ | |
352 | ||
353 | static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size) | |
354 | { | |
496ad9aa | 355 | struct inode *inode = file_inode(filep); |
da1dfb6a SW |
356 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
357 | struct gfs2_inode *ip = GFS2_I(inode); | |
358 | size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift; | |
359 | int hint = min_t(size_t, INT_MAX, blks); | |
360 | ||
21f09c43 AG |
361 | if (hint > atomic_read(&ip->i_sizehint)) |
362 | atomic_set(&ip->i_sizehint, hint); | |
da1dfb6a SW |
363 | } |
364 | ||
3cc3f710 SW |
365 | /** |
366 | * gfs2_allocate_page_backing - Use bmap to allocate blocks | |
367 | * @page: The (locked) page to allocate backing for | |
368 | * | |
369 | * We try to allocate all the blocks required for the page in | |
370 | * one go. This might fail for various reasons, so we keep | |
371 | * trying until all the blocks to back this page are allocated. | |
372 | * If some of the blocks are already allocated, thats ok too. | |
373 | */ | |
374 | ||
375 | static int gfs2_allocate_page_backing(struct page *page) | |
376 | { | |
377 | struct inode *inode = page->mapping->host; | |
378 | struct buffer_head bh; | |
09cbfeaf KS |
379 | unsigned long size = PAGE_SIZE; |
380 | u64 lblock = page->index << (PAGE_SHIFT - inode->i_blkbits); | |
3cc3f710 SW |
381 | |
382 | do { | |
383 | bh.b_state = 0; | |
384 | bh.b_size = size; | |
e9e1ef2b | 385 | gfs2_block_map(inode, lblock, &bh, 1); |
3cc3f710 SW |
386 | if (!buffer_mapped(&bh)) |
387 | return -EIO; | |
388 | size -= bh.b_size; | |
389 | lblock += (bh.b_size >> inode->i_blkbits); | |
390 | } while(size > 0); | |
391 | return 0; | |
392 | } | |
393 | ||
394 | /** | |
395 | * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable | |
396 | * @vma: The virtual memory area | |
9dd868e1 | 397 | * @vmf: The virtual memory fault containing the page to become writable |
3cc3f710 SW |
398 | * |
399 | * When the page becomes writable, we need to ensure that we have | |
400 | * blocks allocated on disk to back that page. | |
401 | */ | |
402 | ||
109dbb1e | 403 | static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf) |
3cc3f710 | 404 | { |
c2ec175c | 405 | struct page *page = vmf->page; |
11bac800 | 406 | struct inode *inode = file_inode(vmf->vma->vm_file); |
3cc3f710 SW |
407 | struct gfs2_inode *ip = GFS2_I(inode); |
408 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
7b9cff46 | 409 | struct gfs2_alloc_parms ap = { .aflags = 0, }; |
3cc3f710 | 410 | unsigned long last_index; |
09cbfeaf | 411 | u64 pos = page->index << PAGE_SHIFT; |
3cc3f710 | 412 | unsigned int data_blocks, ind_blocks, rblocks; |
3cc3f710 | 413 | struct gfs2_holder gh; |
13d921e3 | 414 | loff_t size; |
3cc3f710 SW |
415 | int ret; |
416 | ||
39263d5e | 417 | sb_start_pagefault(inode->i_sb); |
13d921e3 | 418 | |
b54e9a0b | 419 | ret = gfs2_rsqa_alloc(ip); |
0a305e49 | 420 | if (ret) |
a097dc7e | 421 | goto out; |
0a305e49 | 422 | |
11bac800 | 423 | gfs2_size_hint(vmf->vma->vm_file, pos, PAGE_SIZE); |
8e2e0047 | 424 | |
719ee344 SW |
425 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
426 | ret = gfs2_glock_nq(&gh); | |
3cc3f710 | 427 | if (ret) |
2b3dcf35 | 428 | goto out_uninit; |
3cc3f710 | 429 | |
d7c436cd | 430 | /* Update file times before taking page lock */ |
11bac800 | 431 | file_update_time(vmf->vma->vm_file); |
d7c436cd | 432 | |
9c538837 SW |
433 | set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); |
434 | set_bit(GIF_SW_PAGED, &ip->i_flags); | |
435 | ||
09cbfeaf | 436 | if (!gfs2_write_alloc_required(ip, pos, PAGE_SIZE)) { |
13d921e3 SW |
437 | lock_page(page); |
438 | if (!PageUptodate(page) || page->mapping != inode->i_mapping) { | |
439 | ret = -EAGAIN; | |
440 | unlock_page(page); | |
441 | } | |
3cc3f710 | 442 | goto out_unlock; |
13d921e3 SW |
443 | } |
444 | ||
5407e242 BP |
445 | ret = gfs2_rindex_update(sdp); |
446 | if (ret) | |
6dbd8224 SW |
447 | goto out_unlock; |
448 | ||
09cbfeaf | 449 | gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks); |
7b9cff46 | 450 | ap.target = data_blocks + ind_blocks; |
b8fbf471 AD |
451 | ret = gfs2_quota_lock_check(ip, &ap); |
452 | if (ret) | |
453 | goto out_unlock; | |
7b9cff46 | 454 | ret = gfs2_inplace_reserve(ip, &ap); |
3cc3f710 SW |
455 | if (ret) |
456 | goto out_quota_unlock; | |
457 | ||
458 | rblocks = RES_DINODE + ind_blocks; | |
459 | if (gfs2_is_jdata(ip)) | |
460 | rblocks += data_blocks ? data_blocks : 1; | |
bf97b673 | 461 | if (ind_blocks || data_blocks) { |
3cc3f710 | 462 | rblocks += RES_STATFS + RES_QUOTA; |
71f890f7 | 463 | rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks); |
bf97b673 | 464 | } |
3cc3f710 SW |
465 | ret = gfs2_trans_begin(sdp, rblocks, 0); |
466 | if (ret) | |
467 | goto out_trans_fail; | |
468 | ||
469 | lock_page(page); | |
470 | ret = -EINVAL; | |
13d921e3 | 471 | size = i_size_read(inode); |
09cbfeaf | 472 | last_index = (size - 1) >> PAGE_SHIFT; |
13d921e3 SW |
473 | /* Check page index against inode size */ |
474 | if (size == 0 || (page->index > last_index)) | |
475 | goto out_trans_end; | |
476 | ||
477 | ret = -EAGAIN; | |
478 | /* If truncated, we must retry the operation, we may have raced | |
479 | * with the glock demotion code. | |
480 | */ | |
481 | if (!PageUptodate(page) || page->mapping != inode->i_mapping) | |
482 | goto out_trans_end; | |
483 | ||
484 | /* Unstuff, if required, and allocate backing blocks for page */ | |
b7fe2e39 | 485 | ret = 0; |
13d921e3 | 486 | if (gfs2_is_stuffed(ip)) |
3cc3f710 | 487 | ret = gfs2_unstuff_dinode(ip, page); |
13d921e3 SW |
488 | if (ret == 0) |
489 | ret = gfs2_allocate_page_backing(page); | |
3cc3f710 | 490 | |
13d921e3 SW |
491 | out_trans_end: |
492 | if (ret) | |
493 | unlock_page(page); | |
3cc3f710 SW |
494 | gfs2_trans_end(sdp); |
495 | out_trans_fail: | |
496 | gfs2_inplace_release(ip); | |
497 | out_quota_unlock: | |
498 | gfs2_quota_unlock(ip); | |
3cc3f710 SW |
499 | out_unlock: |
500 | gfs2_glock_dq(&gh); | |
2b3dcf35 | 501 | out_uninit: |
3cc3f710 | 502 | gfs2_holder_uninit(&gh); |
13d921e3 SW |
503 | if (ret == 0) { |
504 | set_page_dirty(page); | |
1d1d1a76 | 505 | wait_for_stable_page(page); |
13d921e3 | 506 | } |
2b3dcf35 | 507 | out: |
39263d5e | 508 | sb_end_pagefault(inode->i_sb); |
13d921e3 | 509 | return block_page_mkwrite_return(ret); |
3cc3f710 SW |
510 | } |
511 | ||
f0f37e2f | 512 | static const struct vm_operations_struct gfs2_vm_ops = { |
3cc3f710 | 513 | .fault = filemap_fault, |
f1820361 | 514 | .map_pages = filemap_map_pages, |
3cc3f710 SW |
515 | .page_mkwrite = gfs2_page_mkwrite, |
516 | }; | |
517 | ||
b3b94faa DT |
518 | /** |
519 | * gfs2_mmap - | |
520 | * @file: The file to map | |
521 | * @vma: The VMA which described the mapping | |
522 | * | |
48bf2b17 SW |
523 | * There is no need to get a lock here unless we should be updating |
524 | * atime. We ignore any locking errors since the only consequence is | |
525 | * a missed atime update (which will just be deferred until later). | |
526 | * | |
527 | * Returns: 0 | |
b3b94faa DT |
528 | */ |
529 | ||
530 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
531 | { | |
feaa7bba | 532 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
b3b94faa | 533 | |
b9c93bb7 SW |
534 | if (!(file->f_flags & O_NOATIME) && |
535 | !IS_NOATIME(&ip->i_inode)) { | |
48bf2b17 SW |
536 | struct gfs2_holder i_gh; |
537 | int error; | |
b3b94faa | 538 | |
3d162688 BM |
539 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
540 | &i_gh); | |
b9c93bb7 SW |
541 | if (error) |
542 | return error; | |
3d162688 BM |
543 | /* grab lock to update inode */ |
544 | gfs2_glock_dq_uninit(&i_gh); | |
545 | file_accessed(file); | |
48bf2b17 | 546 | } |
3cc3f710 | 547 | vma->vm_ops = &gfs2_vm_ops; |
b3b94faa | 548 | |
48bf2b17 | 549 | return 0; |
b3b94faa DT |
550 | } |
551 | ||
552 | /** | |
6d4ade98 SW |
553 | * gfs2_open_common - This is common to open and atomic_open |
554 | * @inode: The inode being opened | |
555 | * @file: The file being opened | |
b3b94faa | 556 | * |
6d4ade98 SW |
557 | * This maybe called under a glock or not depending upon how it has |
558 | * been called. We must always be called under a glock for regular | |
559 | * files, however. For other file types, it does not matter whether | |
560 | * we hold the glock or not. | |
561 | * | |
562 | * Returns: Error code or 0 for success | |
b3b94faa DT |
563 | */ |
564 | ||
6d4ade98 | 565 | int gfs2_open_common(struct inode *inode, struct file *file) |
b3b94faa | 566 | { |
b3b94faa | 567 | struct gfs2_file *fp; |
6d4ade98 SW |
568 | int ret; |
569 | ||
570 | if (S_ISREG(inode->i_mode)) { | |
571 | ret = generic_file_open(inode, file); | |
572 | if (ret) | |
573 | return ret; | |
574 | } | |
b3b94faa | 575 | |
6d4ade98 | 576 | fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS); |
b3b94faa DT |
577 | if (!fp) |
578 | return -ENOMEM; | |
579 | ||
f55ab26a | 580 | mutex_init(&fp->f_fl_mutex); |
b3b94faa | 581 | |
feaa7bba | 582 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
5c676f6d | 583 | file->private_data = fp; |
6d4ade98 SW |
584 | return 0; |
585 | } | |
586 | ||
587 | /** | |
588 | * gfs2_open - open a file | |
589 | * @inode: the inode to open | |
590 | * @file: the struct file for this opening | |
591 | * | |
592 | * After atomic_open, this function is only used for opening files | |
593 | * which are already cached. We must still get the glock for regular | |
594 | * files to ensure that we have the file size uptodate for the large | |
595 | * file check which is in the common code. That is only an issue for | |
596 | * regular files though. | |
597 | * | |
598 | * Returns: errno | |
599 | */ | |
600 | ||
601 | static int gfs2_open(struct inode *inode, struct file *file) | |
602 | { | |
603 | struct gfs2_inode *ip = GFS2_I(inode); | |
604 | struct gfs2_holder i_gh; | |
605 | int error; | |
606 | bool need_unlock = false; | |
b3b94faa | 607 | |
b60623c2 | 608 | if (S_ISREG(ip->i_inode.i_mode)) { |
b3b94faa DT |
609 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
610 | &i_gh); | |
611 | if (error) | |
6d4ade98 SW |
612 | return error; |
613 | need_unlock = true; | |
614 | } | |
b3b94faa | 615 | |
6d4ade98 | 616 | error = gfs2_open_common(inode, file); |
b3b94faa | 617 | |
6d4ade98 | 618 | if (need_unlock) |
b3b94faa | 619 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa | 620 | |
b3b94faa DT |
621 | return error; |
622 | } | |
623 | ||
624 | /** | |
df3fd117 | 625 | * gfs2_release - called to close a struct file |
b3b94faa DT |
626 | * @inode: the inode the struct file belongs to |
627 | * @file: the struct file being closed | |
628 | * | |
629 | * Returns: errno | |
630 | */ | |
631 | ||
df3fd117 | 632 | static int gfs2_release(struct inode *inode, struct file *file) |
b3b94faa | 633 | { |
0a305e49 | 634 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 635 | |
8e2e0047 | 636 | kfree(file->private_data); |
5c676f6d | 637 | file->private_data = NULL; |
b3b94faa | 638 | |
2b3dcf35 BP |
639 | if (!(file->f_mode & FMODE_WRITE)) |
640 | return 0; | |
0a305e49 | 641 | |
b54e9a0b | 642 | gfs2_rsqa_delete(ip, &inode->i_writecount); |
b3b94faa DT |
643 | return 0; |
644 | } | |
645 | ||
646 | /** | |
647 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
02c24a82 JB |
648 | * @file: the file that points to the dentry |
649 | * @start: the start position in the file to sync | |
650 | * @end: the end position in the file to sync | |
dba898b0 | 651 | * @datasync: set if we can ignore timestamp changes |
b3b94faa | 652 | * |
2f0264d5 SW |
653 | * We split the data flushing here so that we don't wait for the data |
654 | * until after we've also sent the metadata to disk. Note that for | |
655 | * data=ordered, we will write & wait for the data at the log flush | |
656 | * stage anyway, so this is unlikely to make much of a difference | |
657 | * except in the data=writeback case. | |
658 | * | |
659 | * If the fdatawrite fails due to any reason except -EIO, we will | |
660 | * continue the remainder of the fsync, although we'll still report | |
661 | * the error at the end. This is to match filemap_write_and_wait_range() | |
662 | * behaviour. | |
34126f9f | 663 | * |
b3b94faa DT |
664 | * Returns: errno |
665 | */ | |
666 | ||
02c24a82 JB |
667 | static int gfs2_fsync(struct file *file, loff_t start, loff_t end, |
668 | int datasync) | |
b3b94faa | 669 | { |
2f0264d5 SW |
670 | struct address_space *mapping = file->f_mapping; |
671 | struct inode *inode = mapping->host; | |
0ae45f63 | 672 | int sync_state = inode->i_state & I_DIRTY_ALL; |
dba898b0 | 673 | struct gfs2_inode *ip = GFS2_I(inode); |
87654896 | 674 | int ret = 0, ret1 = 0; |
b3b94faa | 675 | |
2f0264d5 SW |
676 | if (mapping->nrpages) { |
677 | ret1 = filemap_fdatawrite_range(mapping, start, end); | |
678 | if (ret1 == -EIO) | |
679 | return ret1; | |
680 | } | |
02c24a82 | 681 | |
0c901809 BM |
682 | if (!gfs2_is_jdata(ip)) |
683 | sync_state &= ~I_DIRTY_PAGES; | |
dba898b0 | 684 | if (datasync) |
0ae45f63 | 685 | sync_state &= ~(I_DIRTY_SYNC | I_DIRTY_TIME); |
b3b94faa | 686 | |
dba898b0 SW |
687 | if (sync_state) { |
688 | ret = sync_inode_metadata(inode, 1); | |
b5b24d7a | 689 | if (ret) |
dba898b0 | 690 | return ret; |
f1818529 | 691 | if (gfs2_is_jdata(ip)) |
d07a6ac7 JL |
692 | ret = file_write_and_wait(file); |
693 | if (ret) | |
694 | return ret; | |
b5b24d7a | 695 | gfs2_ail_flush(ip->i_gl, 1); |
33c3de32 SW |
696 | } |
697 | ||
2f0264d5 | 698 | if (mapping->nrpages) |
d07a6ac7 | 699 | ret = file_fdatawait_range(file, start, end); |
2f0264d5 SW |
700 | |
701 | return ret ? ret : ret1; | |
b3b94faa DT |
702 | } |
703 | ||
967bcc91 AG |
704 | static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to) |
705 | { | |
706 | struct file *file = iocb->ki_filp; | |
707 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); | |
708 | size_t count = iov_iter_count(to); | |
709 | struct gfs2_holder gh; | |
710 | ssize_t ret; | |
711 | ||
712 | if (!count) | |
713 | return 0; /* skip atime */ | |
714 | ||
715 | gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); | |
716 | ret = gfs2_glock_nq(&gh); | |
717 | if (ret) | |
718 | goto out_uninit; | |
719 | ||
967bcc91 AG |
720 | ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL); |
721 | ||
967bcc91 AG |
722 | gfs2_glock_dq(&gh); |
723 | out_uninit: | |
724 | gfs2_holder_uninit(&gh); | |
725 | return ret; | |
726 | } | |
727 | ||
728 | static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from) | |
729 | { | |
730 | struct file *file = iocb->ki_filp; | |
731 | struct inode *inode = file->f_mapping->host; | |
732 | struct gfs2_inode *ip = GFS2_I(inode); | |
733 | size_t len = iov_iter_count(from); | |
734 | loff_t offset = iocb->ki_pos; | |
735 | struct gfs2_holder gh; | |
736 | ssize_t ret; | |
737 | ||
738 | /* | |
739 | * Deferred lock, even if its a write, since we do no allocation on | |
740 | * this path. All we need to change is the atime, and this lock mode | |
741 | * ensures that other nodes have flushed their buffered read caches | |
742 | * (i.e. their page cache entries for this inode). We do not, | |
743 | * unfortunately, have the option of only flushing a range like the | |
744 | * VFS does. | |
745 | */ | |
746 | gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); | |
747 | ret = gfs2_glock_nq(&gh); | |
748 | if (ret) | |
749 | goto out_uninit; | |
750 | ||
751 | /* Silently fall back to buffered I/O when writing beyond EOF */ | |
752 | if (offset + len > i_size_read(&ip->i_inode)) | |
753 | goto out; | |
754 | ||
755 | ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL); | |
756 | ||
757 | out: | |
758 | gfs2_glock_dq(&gh); | |
759 | out_uninit: | |
760 | gfs2_holder_uninit(&gh); | |
761 | return ret; | |
762 | } | |
763 | ||
764 | static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to) | |
765 | { | |
766 | ssize_t ret; | |
767 | ||
768 | if (iocb->ki_flags & IOCB_DIRECT) { | |
769 | ret = gfs2_file_direct_read(iocb, to); | |
770 | if (likely(ret != -ENOTBLK)) | |
771 | return ret; | |
772 | iocb->ki_flags &= ~IOCB_DIRECT; | |
773 | } | |
774 | return generic_file_read_iter(iocb, to); | |
775 | } | |
776 | ||
56aa616a | 777 | /** |
da56e45b | 778 | * gfs2_file_write_iter - Perform a write to a file |
56aa616a | 779 | * @iocb: The io context |
64bc06bb | 780 | * @from: The data to write |
56aa616a SW |
781 | * |
782 | * We have to do a lock/unlock here to refresh the inode size for | |
783 | * O_APPEND writes, otherwise we can land up writing at the wrong | |
784 | * offset. There is still a race, but provided the app is using its | |
785 | * own file locking, this will make O_APPEND work as expected. | |
786 | * | |
787 | */ | |
788 | ||
da56e45b | 789 | static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
56aa616a SW |
790 | { |
791 | struct file *file = iocb->ki_filp; | |
64bc06bb AG |
792 | struct inode *inode = file_inode(file); |
793 | struct gfs2_inode *ip = GFS2_I(inode); | |
967bcc91 | 794 | ssize_t written = 0, ret; |
0a305e49 | 795 | |
b54e9a0b | 796 | ret = gfs2_rsqa_alloc(ip); |
0a305e49 BP |
797 | if (ret) |
798 | return ret; | |
56aa616a | 799 | |
da56e45b | 800 | gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from)); |
da1dfb6a | 801 | |
2ba48ce5 | 802 | if (iocb->ki_flags & IOCB_APPEND) { |
56aa616a | 803 | struct gfs2_holder gh; |
56aa616a SW |
804 | |
805 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
806 | if (ret) | |
807 | return ret; | |
808 | gfs2_glock_dq_uninit(&gh); | |
809 | } | |
810 | ||
64bc06bb AG |
811 | inode_lock(inode); |
812 | ret = generic_write_checks(iocb, from); | |
813 | if (ret <= 0) | |
814 | goto out; | |
815 | ||
816 | /* We can write back this queue in page reclaim */ | |
817 | current->backing_dev_info = inode_to_bdi(inode); | |
818 | ||
819 | ret = file_remove_privs(file); | |
820 | if (ret) | |
821 | goto out2; | |
822 | ||
823 | ret = file_update_time(file); | |
824 | if (ret) | |
825 | goto out2; | |
826 | ||
967bcc91 AG |
827 | if (iocb->ki_flags & IOCB_DIRECT) { |
828 | struct address_space *mapping = file->f_mapping; | |
829 | loff_t pos, endbyte; | |
830 | ssize_t buffered; | |
831 | ||
832 | written = gfs2_file_direct_write(iocb, from); | |
833 | if (written < 0 || !iov_iter_count(from)) | |
834 | goto out2; | |
835 | ||
836 | ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops); | |
837 | if (unlikely(ret < 0)) | |
838 | goto out2; | |
839 | buffered = ret; | |
840 | ||
841 | /* | |
842 | * We need to ensure that the page cache pages are written to | |
843 | * disk and invalidated to preserve the expected O_DIRECT | |
844 | * semantics. | |
845 | */ | |
846 | pos = iocb->ki_pos; | |
847 | endbyte = pos + buffered - 1; | |
848 | ret = filemap_write_and_wait_range(mapping, pos, endbyte); | |
849 | if (!ret) { | |
850 | iocb->ki_pos += buffered; | |
851 | written += buffered; | |
852 | invalidate_mapping_pages(mapping, | |
853 | pos >> PAGE_SHIFT, | |
854 | endbyte >> PAGE_SHIFT); | |
855 | } else { | |
856 | /* | |
857 | * We don't know how much we wrote, so just return | |
858 | * the number of bytes which were direct-written | |
859 | */ | |
860 | } | |
861 | } else { | |
862 | ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops); | |
863 | if (likely(ret > 0)) | |
864 | iocb->ki_pos += ret; | |
865 | } | |
64bc06bb AG |
866 | |
867 | out2: | |
868 | current->backing_dev_info = NULL; | |
869 | out: | |
870 | inode_unlock(inode); | |
871 | if (likely(ret > 0)) { | |
64bc06bb AG |
872 | /* Handle various SYNC-type writes */ |
873 | ret = generic_write_sync(iocb, ret); | |
874 | } | |
967bcc91 | 875 | return written ? written : ret; |
56aa616a SW |
876 | } |
877 | ||
2fe17c10 CH |
878 | static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len, |
879 | int mode) | |
880 | { | |
fffb6412 | 881 | struct super_block *sb = inode->i_sb; |
2fe17c10 | 882 | struct gfs2_inode *ip = GFS2_I(inode); |
fffb6412 | 883 | loff_t end = offset + len; |
2fe17c10 CH |
884 | struct buffer_head *dibh; |
885 | int error; | |
2fe17c10 CH |
886 | |
887 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
888 | if (unlikely(error)) | |
64dd153c | 889 | return error; |
2fe17c10 | 890 | |
350a9b0a | 891 | gfs2_trans_add_meta(ip->i_gl, dibh); |
2fe17c10 CH |
892 | |
893 | if (gfs2_is_stuffed(ip)) { | |
894 | error = gfs2_unstuff_dinode(ip, NULL); | |
895 | if (unlikely(error)) | |
896 | goto out; | |
897 | } | |
898 | ||
fffb6412 | 899 | while (offset < end) { |
c2589282 AG |
900 | struct iomap iomap = { }; |
901 | ||
628e366d AG |
902 | error = gfs2_iomap_get_alloc(inode, offset, end - offset, |
903 | &iomap); | |
fffb6412 | 904 | if (error) |
64dd153c | 905 | goto out; |
fffb6412 | 906 | offset = iomap.offset + iomap.length; |
d505a96a | 907 | if (!(iomap.flags & IOMAP_F_NEW)) |
64dd153c | 908 | continue; |
fffb6412 AG |
909 | error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits, |
910 | iomap.length >> inode->i_blkbits, | |
911 | GFP_NOFS); | |
912 | if (error) { | |
913 | fs_err(GFS2_SB(inode), "Failed to zero data buffers\n"); | |
2fe17c10 | 914 | goto out; |
64dd153c | 915 | } |
2fe17c10 | 916 | } |
2fe17c10 | 917 | out: |
64dd153c | 918 | brelse(dibh); |
2fe17c10 CH |
919 | return error; |
920 | } | |
d9be0cda AD |
921 | /** |
922 | * calc_max_reserv() - Reverse of write_calc_reserv. Given a number of | |
923 | * blocks, determine how many bytes can be written. | |
924 | * @ip: The inode in question. | |
925 | * @len: Max cap of bytes. What we return in *len must be <= this. | |
926 | * @data_blocks: Compute and return the number of data blocks needed | |
927 | * @ind_blocks: Compute and return the number of indirect blocks needed | |
928 | * @max_blocks: The total blocks available to work with. | |
929 | * | |
930 | * Returns: void, but @len, @data_blocks and @ind_blocks are filled in. | |
931 | */ | |
932 | static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len, | |
933 | unsigned int *data_blocks, unsigned int *ind_blocks, | |
934 | unsigned int max_blocks) | |
2fe17c10 | 935 | { |
d9be0cda | 936 | loff_t max = *len; |
2fe17c10 | 937 | const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
2fe17c10 CH |
938 | unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1); |
939 | ||
940 | for (tmp = max_data; tmp > sdp->sd_diptrs;) { | |
941 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); | |
942 | max_data -= tmp; | |
943 | } | |
d9be0cda | 944 | |
2fe17c10 CH |
945 | *data_blocks = max_data; |
946 | *ind_blocks = max_blocks - max_data; | |
947 | *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift; | |
948 | if (*len > max) { | |
949 | *len = max; | |
950 | gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks); | |
951 | } | |
952 | } | |
953 | ||
9c9f1159 | 954 | static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len) |
2fe17c10 | 955 | { |
496ad9aa | 956 | struct inode *inode = file_inode(file); |
2fe17c10 CH |
957 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
958 | struct gfs2_inode *ip = GFS2_I(inode); | |
7b9cff46 | 959 | struct gfs2_alloc_parms ap = { .aflags = 0, }; |
2fe17c10 | 960 | unsigned int data_blocks = 0, ind_blocks = 0, rblocks; |
174d1232 | 961 | loff_t bytes, max_bytes, max_blks; |
2fe17c10 | 962 | int error; |
4442f2e0 SW |
963 | const loff_t pos = offset; |
964 | const loff_t count = len; | |
6905d9e4 | 965 | loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1); |
2fe17c10 | 966 | loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift; |
64dd153c | 967 | loff_t max_chunk_size = UINT_MAX & bsize_mask; |
a0846a53 | 968 | |
2fe17c10 CH |
969 | next = (next + 1) << sdp->sd_sb.sb_bsize_shift; |
970 | ||
6905d9e4 | 971 | offset &= bsize_mask; |
2fe17c10 CH |
972 | |
973 | len = next - offset; | |
974 | bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2; | |
975 | if (!bytes) | |
976 | bytes = UINT_MAX; | |
6905d9e4 BM |
977 | bytes &= bsize_mask; |
978 | if (bytes == 0) | |
979 | bytes = sdp->sd_sb.sb_bsize; | |
2fe17c10 | 980 | |
da1dfb6a | 981 | gfs2_size_hint(file, offset, len); |
8e2e0047 | 982 | |
d9be0cda AD |
983 | gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks); |
984 | ap.min_target = data_blocks + ind_blocks; | |
985 | ||
2fe17c10 CH |
986 | while (len > 0) { |
987 | if (len < bytes) | |
988 | bytes = len; | |
58a7d5fb BM |
989 | if (!gfs2_write_alloc_required(ip, offset, bytes)) { |
990 | len -= bytes; | |
991 | offset += bytes; | |
992 | continue; | |
993 | } | |
d9be0cda AD |
994 | |
995 | /* We need to determine how many bytes we can actually | |
996 | * fallocate without exceeding quota or going over the | |
997 | * end of the fs. We start off optimistically by assuming | |
998 | * we can write max_bytes */ | |
999 | max_bytes = (len > max_chunk_size) ? max_chunk_size : len; | |
1000 | ||
1001 | /* Since max_bytes is most likely a theoretical max, we | |
1002 | * calculate a more realistic 'bytes' to serve as a good | |
1003 | * starting point for the number of bytes we may be able | |
1004 | * to write */ | |
2fe17c10 | 1005 | gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks); |
7b9cff46 | 1006 | ap.target = data_blocks + ind_blocks; |
b8fbf471 AD |
1007 | |
1008 | error = gfs2_quota_lock_check(ip, &ap); | |
2fe17c10 | 1009 | if (error) |
9c9f1159 | 1010 | return error; |
d9be0cda AD |
1011 | /* ap.allowed tells us how many blocks quota will allow |
1012 | * us to write. Check if this reduces max_blks */ | |
174d1232 AG |
1013 | max_blks = UINT_MAX; |
1014 | if (ap.allowed) | |
d9be0cda | 1015 | max_blks = ap.allowed; |
2fe17c10 | 1016 | |
7b9cff46 | 1017 | error = gfs2_inplace_reserve(ip, &ap); |
d9be0cda | 1018 | if (error) |
2fe17c10 | 1019 | goto out_qunlock; |
d9be0cda AD |
1020 | |
1021 | /* check if the selected rgrp limits our max_blks further */ | |
1022 | if (ap.allowed && ap.allowed < max_blks) | |
1023 | max_blks = ap.allowed; | |
1024 | ||
1025 | /* Almost done. Calculate bytes that can be written using | |
1026 | * max_blks. We also recompute max_bytes, data_blocks and | |
1027 | * ind_blocks */ | |
1028 | calc_max_reserv(ip, &max_bytes, &data_blocks, | |
1029 | &ind_blocks, max_blks); | |
2fe17c10 CH |
1030 | |
1031 | rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA + | |
71f890f7 | 1032 | RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks); |
2fe17c10 CH |
1033 | if (gfs2_is_jdata(ip)) |
1034 | rblocks += data_blocks ? data_blocks : 1; | |
1035 | ||
1036 | error = gfs2_trans_begin(sdp, rblocks, | |
09cbfeaf | 1037 | PAGE_SIZE/sdp->sd_sb.sb_bsize); |
2fe17c10 CH |
1038 | if (error) |
1039 | goto out_trans_fail; | |
1040 | ||
1041 | error = fallocate_chunk(inode, offset, max_bytes, mode); | |
1042 | gfs2_trans_end(sdp); | |
1043 | ||
1044 | if (error) | |
1045 | goto out_trans_fail; | |
1046 | ||
1047 | len -= max_bytes; | |
1048 | offset += max_bytes; | |
1049 | gfs2_inplace_release(ip); | |
1050 | gfs2_quota_unlock(ip); | |
2fe17c10 | 1051 | } |
4442f2e0 | 1052 | |
1885867b AP |
1053 | if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size) { |
1054 | i_size_write(inode, pos + count); | |
98f1a696 | 1055 | file_update_time(file); |
4b813f09 | 1056 | mark_inode_dirty(inode); |
1885867b AP |
1057 | } |
1058 | ||
dde0c2e7 CH |
1059 | if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host)) |
1060 | return vfs_fsync_range(file, pos, pos + count - 1, | |
1061 | (file->f_flags & __O_SYNC) ? 0 : 1); | |
1062 | return 0; | |
2fe17c10 CH |
1063 | |
1064 | out_trans_fail: | |
1065 | gfs2_inplace_release(ip); | |
1066 | out_qunlock: | |
1067 | gfs2_quota_unlock(ip); | |
9c9f1159 AP |
1068 | return error; |
1069 | } | |
1070 | ||
1071 | static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len) | |
1072 | { | |
1073 | struct inode *inode = file_inode(file); | |
d4d7fc12 | 1074 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
9c9f1159 AP |
1075 | struct gfs2_inode *ip = GFS2_I(inode); |
1076 | struct gfs2_holder gh; | |
1077 | int ret; | |
1078 | ||
4e56a641 | 1079 | if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)) |
d4d7fc12 AP |
1080 | return -EOPNOTSUPP; |
1081 | /* fallocate is needed by gfs2_grow to reserve space in the rindex */ | |
1082 | if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex) | |
9c9f1159 AP |
1083 | return -EOPNOTSUPP; |
1084 | ||
5955102c | 1085 | inode_lock(inode); |
9c9f1159 AP |
1086 | |
1087 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
1088 | ret = gfs2_glock_nq(&gh); | |
1089 | if (ret) | |
1090 | goto out_uninit; | |
1091 | ||
1092 | if (!(mode & FALLOC_FL_KEEP_SIZE) && | |
1093 | (offset + len) > inode->i_size) { | |
1094 | ret = inode_newsize_ok(inode, offset + len); | |
1095 | if (ret) | |
1096 | goto out_unlock; | |
1097 | } | |
1098 | ||
1099 | ret = get_write_access(inode); | |
1100 | if (ret) | |
1101 | goto out_unlock; | |
1102 | ||
4e56a641 AG |
1103 | if (mode & FALLOC_FL_PUNCH_HOLE) { |
1104 | ret = __gfs2_punch_hole(file, offset, len); | |
1105 | } else { | |
1106 | ret = gfs2_rsqa_alloc(ip); | |
1107 | if (ret) | |
1108 | goto out_putw; | |
9c9f1159 | 1109 | |
4e56a641 AG |
1110 | ret = __gfs2_fallocate(file, mode, offset, len); |
1111 | ||
1112 | if (ret) | |
1113 | gfs2_rs_deltree(&ip->i_res); | |
1114 | } | |
a097dc7e | 1115 | |
9c9f1159 AP |
1116 | out_putw: |
1117 | put_write_access(inode); | |
2fe17c10 | 1118 | out_unlock: |
a0846a53 | 1119 | gfs2_glock_dq(&gh); |
2fe17c10 | 1120 | out_uninit: |
a0846a53 | 1121 | gfs2_holder_uninit(&gh); |
5955102c | 1122 | inode_unlock(inode); |
9c9f1159 | 1123 | return ret; |
2fe17c10 CH |
1124 | } |
1125 | ||
f1ea6f4e BP |
1126 | static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe, |
1127 | struct file *out, loff_t *ppos, | |
1128 | size_t len, unsigned int flags) | |
1129 | { | |
1130 | int error; | |
1131 | struct gfs2_inode *ip = GFS2_I(out->f_mapping->host); | |
1132 | ||
b54e9a0b | 1133 | error = gfs2_rsqa_alloc(ip); |
f1ea6f4e BP |
1134 | if (error) |
1135 | return (ssize_t)error; | |
1136 | ||
1137 | gfs2_size_hint(out, *ppos, len); | |
1138 | ||
1139 | return iter_file_splice_write(pipe, out, ppos, len, flags); | |
1140 | } | |
1141 | ||
f057f6cd SW |
1142 | #ifdef CONFIG_GFS2_FS_LOCKING_DLM |
1143 | ||
b3b94faa DT |
1144 | /** |
1145 | * gfs2_lock - acquire/release a posix lock on a file | |
1146 | * @file: the file pointer | |
1147 | * @cmd: either modify or retrieve lock state, possibly wait | |
1148 | * @fl: type and range of lock | |
1149 | * | |
1150 | * Returns: errno | |
1151 | */ | |
1152 | ||
1153 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
1154 | { | |
feaa7bba SW |
1155 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
1156 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
f057f6cd | 1157 | struct lm_lockstruct *ls = &sdp->sd_lockstruct; |
b3b94faa | 1158 | |
b3b94faa DT |
1159 | if (!(fl->fl_flags & FL_POSIX)) |
1160 | return -ENOLCK; | |
720e7749 | 1161 | if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK) |
b3b94faa DT |
1162 | return -ENOLCK; |
1163 | ||
586759f0 ME |
1164 | if (cmd == F_CANCELLK) { |
1165 | /* Hack: */ | |
1166 | cmd = F_SETLK; | |
1167 | fl->fl_type = F_UNLCK; | |
1168 | } | |
04aea0ca | 1169 | if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags))) { |
c2952d20 | 1170 | if (fl->fl_type == F_UNLCK) |
4f656367 | 1171 | locks_lock_file_wait(file, fl); |
f057f6cd | 1172 | return -EIO; |
c2952d20 | 1173 | } |
b3b94faa | 1174 | if (IS_GETLK(cmd)) |
f057f6cd | 1175 | return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); |
b3b94faa | 1176 | else if (fl->fl_type == F_UNLCK) |
f057f6cd | 1177 | return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); |
b3b94faa | 1178 | else |
f057f6cd | 1179 | return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); |
b3b94faa DT |
1180 | } |
1181 | ||
b3b94faa DT |
1182 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
1183 | { | |
5c676f6d | 1184 | struct gfs2_file *fp = file->private_data; |
b3b94faa | 1185 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
496ad9aa | 1186 | struct gfs2_inode *ip = GFS2_I(file_inode(file)); |
b3b94faa DT |
1187 | struct gfs2_glock *gl; |
1188 | unsigned int state; | |
b58bf407 | 1189 | u16 flags; |
b3b94faa | 1190 | int error = 0; |
2ddfbdd6 | 1191 | int sleeptime; |
b3b94faa DT |
1192 | |
1193 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
2ddfbdd6 | 1194 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT; |
b3b94faa | 1195 | |
f55ab26a | 1196 | mutex_lock(&fp->f_fl_mutex); |
b3b94faa | 1197 | |
283c9a97 | 1198 | if (gfs2_holder_initialized(fl_gh)) { |
4d62d3f7 | 1199 | struct file_lock request; |
b3b94faa DT |
1200 | if (fl_gh->gh_state == state) |
1201 | goto out; | |
4d62d3f7 N |
1202 | locks_init_lock(&request); |
1203 | request.fl_type = F_UNLCK; | |
1204 | request.fl_flags = FL_FLOCK; | |
1205 | locks_lock_file_wait(file, &request); | |
5bef3e7c | 1206 | gfs2_glock_dq(fl_gh); |
b4c20166 | 1207 | gfs2_holder_reinit(state, flags, fl_gh); |
b3b94faa | 1208 | } else { |
6802e340 SW |
1209 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, |
1210 | &gfs2_flock_glops, CREATE, &gl); | |
b3b94faa DT |
1211 | if (error) |
1212 | goto out; | |
b4c20166 AD |
1213 | gfs2_holder_init(gl, state, flags, fl_gh); |
1214 | gfs2_glock_put(gl); | |
b3b94faa | 1215 | } |
2ddfbdd6 BP |
1216 | for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) { |
1217 | error = gfs2_glock_nq(fl_gh); | |
1218 | if (error != GLR_TRYFAILED) | |
1219 | break; | |
1220 | fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT; | |
1221 | fl_gh->gh_error = 0; | |
1222 | msleep(sleeptime); | |
1223 | } | |
b3b94faa DT |
1224 | if (error) { |
1225 | gfs2_holder_uninit(fl_gh); | |
1226 | if (error == GLR_TRYFAILED) | |
1227 | error = -EAGAIN; | |
1228 | } else { | |
4f656367 | 1229 | error = locks_lock_file_wait(file, fl); |
feaa7bba | 1230 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
b3b94faa DT |
1231 | } |
1232 | ||
420b9e5e | 1233 | out: |
f55ab26a | 1234 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
1235 | return error; |
1236 | } | |
1237 | ||
1238 | static void do_unflock(struct file *file, struct file_lock *fl) | |
1239 | { | |
5c676f6d | 1240 | struct gfs2_file *fp = file->private_data; |
b3b94faa DT |
1241 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
1242 | ||
f55ab26a | 1243 | mutex_lock(&fp->f_fl_mutex); |
4f656367 | 1244 | locks_lock_file_wait(file, fl); |
6df9f9a2 | 1245 | if (gfs2_holder_initialized(fl_gh)) { |
2ddfbdd6 | 1246 | gfs2_glock_dq(fl_gh); |
0a33443b SW |
1247 | gfs2_holder_uninit(fl_gh); |
1248 | } | |
f55ab26a | 1249 | mutex_unlock(&fp->f_fl_mutex); |
b3b94faa DT |
1250 | } |
1251 | ||
1252 | /** | |
1253 | * gfs2_flock - acquire/release a flock lock on a file | |
1254 | * @file: the file pointer | |
1255 | * @cmd: either modify or retrieve lock state, possibly wait | |
1256 | * @fl: type and range of lock | |
1257 | * | |
1258 | * Returns: errno | |
1259 | */ | |
1260 | ||
1261 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
1262 | { | |
b3b94faa DT |
1263 | if (!(fl->fl_flags & FL_FLOCK)) |
1264 | return -ENOLCK; | |
a12af1eb AD |
1265 | if (fl->fl_type & LOCK_MAND) |
1266 | return -EOPNOTSUPP; | |
b3b94faa | 1267 | |
b3b94faa DT |
1268 | if (fl->fl_type == F_UNLCK) { |
1269 | do_unflock(file, fl); | |
1270 | return 0; | |
d00223f1 | 1271 | } else { |
b3b94faa | 1272 | return do_flock(file, cmd, fl); |
d00223f1 | 1273 | } |
b3b94faa DT |
1274 | } |
1275 | ||
10d21988 | 1276 | const struct file_operations gfs2_file_fops = { |
26c1a574 | 1277 | .llseek = gfs2_llseek, |
967bcc91 | 1278 | .read_iter = gfs2_file_read_iter, |
da56e45b | 1279 | .write_iter = gfs2_file_write_iter, |
81214bab | 1280 | .iopoll = iomap_dio_iopoll, |
26c1a574 SW |
1281 | .unlocked_ioctl = gfs2_ioctl, |
1282 | .mmap = gfs2_mmap, | |
1283 | .open = gfs2_open, | |
df3fd117 | 1284 | .release = gfs2_release, |
26c1a574 SW |
1285 | .fsync = gfs2_fsync, |
1286 | .lock = gfs2_lock, | |
26c1a574 | 1287 | .flock = gfs2_flock, |
82c156f8 | 1288 | .splice_read = generic_file_splice_read, |
f42a69fa | 1289 | .splice_write = gfs2_file_splice_write, |
1c994a09 | 1290 | .setlease = simple_nosetlease, |
2fe17c10 | 1291 | .fallocate = gfs2_fallocate, |
b3b94faa DT |
1292 | }; |
1293 | ||
10d21988 | 1294 | const struct file_operations gfs2_dir_fops = { |
1d1bb236 | 1295 | .iterate_shared = gfs2_readdir, |
26c1a574 SW |
1296 | .unlocked_ioctl = gfs2_ioctl, |
1297 | .open = gfs2_open, | |
df3fd117 | 1298 | .release = gfs2_release, |
26c1a574 SW |
1299 | .fsync = gfs2_fsync, |
1300 | .lock = gfs2_lock, | |
1301 | .flock = gfs2_flock, | |
6038f373 | 1302 | .llseek = default_llseek, |
b3b94faa DT |
1303 | }; |
1304 | ||
f057f6cd SW |
1305 | #endif /* CONFIG_GFS2_FS_LOCKING_DLM */ |
1306 | ||
10d21988 | 1307 | const struct file_operations gfs2_file_fops_nolock = { |
c97bfe43 | 1308 | .llseek = gfs2_llseek, |
967bcc91 | 1309 | .read_iter = gfs2_file_read_iter, |
da56e45b | 1310 | .write_iter = gfs2_file_write_iter, |
81214bab | 1311 | .iopoll = iomap_dio_iopoll, |
c97bfe43 WC |
1312 | .unlocked_ioctl = gfs2_ioctl, |
1313 | .mmap = gfs2_mmap, | |
1314 | .open = gfs2_open, | |
df3fd117 | 1315 | .release = gfs2_release, |
c97bfe43 | 1316 | .fsync = gfs2_fsync, |
82c156f8 | 1317 | .splice_read = generic_file_splice_read, |
f42a69fa | 1318 | .splice_write = gfs2_file_splice_write, |
f057f6cd | 1319 | .setlease = generic_setlease, |
2fe17c10 | 1320 | .fallocate = gfs2_fallocate, |
c97bfe43 WC |
1321 | }; |
1322 | ||
10d21988 | 1323 | const struct file_operations gfs2_dir_fops_nolock = { |
1d1bb236 | 1324 | .iterate_shared = gfs2_readdir, |
c97bfe43 WC |
1325 | .unlocked_ioctl = gfs2_ioctl, |
1326 | .open = gfs2_open, | |
df3fd117 | 1327 | .release = gfs2_release, |
c97bfe43 | 1328 | .fsync = gfs2_fsync, |
6038f373 | 1329 | .llseek = default_llseek, |
c97bfe43 WC |
1330 | }; |
1331 |