Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 : * All Rights Reserved.
5 : */
6 : #include "xfs.h"
7 : #include "xfs_fs.h"
8 : #include "xfs_shared.h"
9 : #include "xfs_format.h"
10 : #include "xfs_log_format.h"
11 : #include "xfs_trans_resv.h"
12 : #include "xfs_mount.h"
13 : #include "xfs_inode.h"
14 : #include "xfs_acl.h"
15 : #include "xfs_quota.h"
16 : #include "xfs_da_format.h"
17 : #include "xfs_da_btree.h"
18 : #include "xfs_attr.h"
19 : #include "xfs_trans.h"
20 : #include "xfs_trace.h"
21 : #include "xfs_icache.h"
22 : #include "xfs_symlink.h"
23 : #include "xfs_dir2.h"
24 : #include "xfs_iomap.h"
25 : #include "xfs_error.h"
26 : #include "xfs_ioctl.h"
27 : #include "xfs_xattr.h"
28 :
29 : #include <linux/posix_acl.h>
30 : #include <linux/security.h>
31 : #include <linux/iversion.h>
32 : #include <linux/fiemap.h>
33 :
34 : /*
35 : * Directories have different lock order w.r.t. mmap_lock compared to regular
36 : * files. This is due to readdir potentially triggering page faults on a user
37 : * buffer inside filldir(), and this happens with the ilock on the directory
38 : * held. For regular files, the lock order is the other way around - the
39 : * mmap_lock is taken during the page fault, and then we lock the ilock to do
40 : * block mapping. Hence we need a different class for the directory ilock so
41 : * that lockdep can tell them apart.
42 : */
43 : static struct lock_class_key xfs_nondir_ilock_class;
44 : static struct lock_class_key xfs_dir_ilock_class;
45 :
46 : static int
47 : xfs_initxattrs(
48 : struct inode *inode,
49 : const struct xattr *xattr_array,
50 : void *fs_info)
51 : {
52 : const struct xattr *xattr;
53 : struct xfs_inode *ip = XFS_I(inode);
54 : int error = 0;
55 :
56 : for (xattr = xattr_array; xattr->name != NULL; xattr++) {
57 : struct xfs_da_args args = {
58 : .dp = ip,
59 : .attr_filter = XFS_ATTR_SECURE,
60 : .name = xattr->name,
61 : .namelen = strlen(xattr->name),
62 : .value = xattr->value,
63 : .valuelen = xattr->value_len,
64 : };
65 : error = xfs_attr_change(&args);
66 : if (error < 0)
67 : break;
68 : }
69 : return error;
70 : }
71 :
72 : /*
73 : * Hook in SELinux. This is not quite correct yet, what we really need
74 : * here (as we do for default ACLs) is a mechanism by which creation of
75 : * these attrs can be journalled at inode creation time (along with the
76 : * inode, of course, such that log replay can't cause these to be lost).
77 : */
78 : int
79 2307851 : xfs_inode_init_security(
80 : struct inode *inode,
81 : struct inode *dir,
82 : const struct qstr *qstr)
83 : {
84 2307851 : return security_inode_init_security(inode, dir, qstr,
85 : &xfs_initxattrs, NULL);
86 : }
87 :
88 : static void
89 : xfs_dentry_to_name(
90 : struct xfs_name *namep,
91 : struct dentry *dentry)
92 : {
93 222054454 : namep->name = dentry->d_name.name;
94 222054454 : namep->len = dentry->d_name.len;
95 222054454 : namep->type = XFS_DIR3_FT_UNKNOWN;
96 : }
97 :
98 : static int
99 : xfs_dentry_mode_to_name(
100 : struct xfs_name *namep,
101 : struct dentry *dentry,
102 : int mode)
103 : {
104 451774126 : namep->name = dentry->d_name.name;
105 451774126 : namep->len = dentry->d_name.len;
106 903741543 : namep->type = xfs_mode_to_ftype(mode);
107 :
108 451967417 : if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
109 33124838 : return -EFSCORRUPTED;
110 :
111 : return 0;
112 : }
113 :
114 : STATIC void
115 0 : xfs_cleanup_inode(
116 : struct inode *dir,
117 : struct inode *inode,
118 : struct dentry *dentry)
119 : {
120 0 : struct xfs_name teardown;
121 :
122 : /* Oh, the horror.
123 : * If we can't add the ACL or we fail in
124 : * xfs_inode_init_security we must back out.
125 : * ENOSPC can hit here, among other things.
126 : */
127 0 : xfs_dentry_to_name(&teardown, dentry);
128 :
129 0 : xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
130 0 : }
131 :
132 : /*
133 : * Check to see if we are likely to need an extended attribute to be added to
134 : * the inode we are about to allocate. This allows the attribute fork to be
135 : * created during the inode allocation, reducing the number of transactions we
136 : * need to do in this fast path.
137 : *
138 : * The security checks are optimistic, but not guaranteed. The two LSMs that
139 : * require xattrs to be added here (selinux and smack) are also the only two
140 : * LSMs that add a sb->s_security structure to the superblock. Hence if security
141 : * is enabled and sb->s_security is set, we have a pretty good idea that we are
142 : * going to be asked to add a security xattr immediately after allocating the
143 : * xfs inode and instantiating the VFS inode.
144 : */
145 : static inline bool
146 : xfs_create_need_xattr(
147 : struct inode *dir,
148 : struct posix_acl *default_acl,
149 : struct posix_acl *acl)
150 : {
151 48897049 : if (acl)
152 : return true;
153 48736815 : if (default_acl)
154 11 : return true;
155 : #if IS_ENABLED(CONFIG_SECURITY)
156 : if (dir->i_sb->s_security)
157 : return true;
158 : #endif
159 : return false;
160 : }
161 :
162 :
163 : STATIC int
164 56560125 : xfs_generic_create(
165 : struct mnt_idmap *idmap,
166 : struct inode *dir,
167 : struct dentry *dentry,
168 : umode_t mode,
169 : dev_t rdev,
170 : struct file *tmpfile) /* unnamed file */
171 : {
172 56560125 : struct inode *inode;
173 56560125 : struct xfs_inode *ip = NULL;
174 56560125 : struct posix_acl *default_acl, *acl;
175 56560125 : struct xfs_name name;
176 56560125 : int error;
177 :
178 : /*
179 : * Irix uses Missed'em'V split, but doesn't want to see
180 : * the upper 5 bits of (14bit) major.
181 : */
182 56560125 : if (S_ISCHR(mode) || S_ISBLK(mode)) {
183 5350912 : if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
184 : return -EINVAL;
185 : } else {
186 : rdev = 0;
187 : }
188 :
189 56560125 : error = posix_acl_create(dir, &mode, &default_acl, &acl);
190 55861524 : if (error)
191 : return error;
192 :
193 : /* Verify mode is valid also for tmpfile case */
194 55852743 : error = xfs_dentry_mode_to_name(&name, dentry, mode);
195 56297321 : if (unlikely(error))
196 0 : goto out_free_acl;
197 :
198 56297321 : if (!tmpfile) {
199 48897049 : error = xfs_create(idmap, XFS_I(dir), &name, mode, rdev,
200 48897049 : xfs_create_need_xattr(dir, default_acl, acl),
201 : &ip);
202 : } else {
203 7400272 : error = xfs_create_tmpfile(idmap, XFS_I(dir), mode, &ip);
204 : }
205 57284670 : if (unlikely(error))
206 582875 : goto out_free_acl;
207 :
208 56701795 : inode = VFS_I(ip);
209 :
210 56701795 : error = xfs_inode_init_security(inode, dir, &dentry->d_name);
211 56701795 : if (unlikely(error))
212 : goto out_cleanup_inode;
213 :
214 56701795 : if (default_acl) {
215 15593 : error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
216 15593 : if (error)
217 0 : goto out_cleanup_inode;
218 : }
219 56701795 : if (acl) {
220 171020 : error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
221 171020 : if (error)
222 0 : goto out_cleanup_inode;
223 : }
224 :
225 56701795 : xfs_setup_iops(ip);
226 :
227 56365095 : if (tmpfile) {
228 : /*
229 : * The VFS requires that any inode fed to d_tmpfile must have
230 : * nlink == 1 so that it can decrement the nlink in d_tmpfile.
231 : * However, we created the temp file with nlink == 0 because
232 : * we're not allowed to put an inode with nlink > 0 on the
233 : * unlinked list. Therefore we have to set nlink to 1 so that
234 : * d_tmpfile can immediately set it back to zero.
235 : */
236 7695039 : set_nlink(inode, 1);
237 7905652 : d_tmpfile(tmpfile, inode);
238 : } else
239 48670056 : d_instantiate(dentry, inode);
240 :
241 56930994 : xfs_finish_inode_setup(ip);
242 :
243 57421201 : out_free_acl:
244 57421201 : posix_acl_release(default_acl);
245 56828969 : posix_acl_release(acl);
246 56828969 : return error;
247 :
248 0 : out_cleanup_inode:
249 0 : xfs_finish_inode_setup(ip);
250 0 : if (!tmpfile)
251 0 : xfs_cleanup_inode(dir, inode, dentry);
252 0 : xfs_irele(ip);
253 0 : goto out_free_acl;
254 : }
255 :
256 : STATIC int
257 5351104 : xfs_vn_mknod(
258 : struct mnt_idmap *idmap,
259 : struct inode *dir,
260 : struct dentry *dentry,
261 : umode_t mode,
262 : dev_t rdev)
263 : {
264 5351104 : return xfs_generic_create(idmap, dir, dentry, mode, rdev, NULL);
265 : }
266 :
267 : STATIC int
268 36852984 : xfs_vn_create(
269 : struct mnt_idmap *idmap,
270 : struct inode *dir,
271 : struct dentry *dentry,
272 : umode_t mode,
273 : bool flags)
274 : {
275 36852984 : return xfs_generic_create(idmap, dir, dentry, mode, 0, NULL);
276 : }
277 :
278 : STATIC int
279 6667624 : xfs_vn_mkdir(
280 : struct mnt_idmap *idmap,
281 : struct inode *dir,
282 : struct dentry *dentry,
283 : umode_t mode)
284 : {
285 6667624 : return xfs_generic_create(idmap, dir, dentry, mode | S_IFDIR, 0, NULL);
286 : }
287 :
288 : STATIC struct dentry *
289 164568726 : xfs_vn_lookup(
290 : struct inode *dir,
291 : struct dentry *dentry,
292 : unsigned int flags)
293 : {
294 164568726 : struct inode *inode;
295 164568726 : struct xfs_inode *cip;
296 164568726 : struct xfs_name name;
297 164568726 : int error;
298 :
299 164568726 : if (dentry->d_name.len >= MAXNAMELEN)
300 : return ERR_PTR(-ENAMETOOLONG);
301 :
302 164384650 : xfs_dentry_to_name(&name, dentry);
303 164384650 : error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
304 164562904 : if (likely(!error))
305 42123436 : inode = VFS_I(cip);
306 122439468 : else if (likely(error == -ENOENT))
307 : inode = NULL;
308 : else
309 62455 : inode = ERR_PTR(error);
310 164562904 : return d_splice_alias(inode, dentry);
311 : }
312 :
313 : STATIC struct dentry *
314 1077139 : xfs_vn_ci_lookup(
315 : struct inode *dir,
316 : struct dentry *dentry,
317 : unsigned int flags)
318 : {
319 1077139 : struct xfs_inode *ip;
320 1077139 : struct xfs_name xname;
321 1077139 : struct xfs_name ci_name;
322 1077139 : struct qstr dname;
323 1077139 : int error;
324 :
325 1077139 : if (dentry->d_name.len >= MAXNAMELEN)
326 : return ERR_PTR(-ENAMETOOLONG);
327 :
328 1077139 : xfs_dentry_to_name(&xname, dentry);
329 1077139 : error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
330 1077139 : if (unlikely(error)) {
331 512444 : if (unlikely(error != -ENOENT))
332 0 : return ERR_PTR(error);
333 : /*
334 : * call d_add(dentry, NULL) here when d_drop_negative_children
335 : * is called in xfs_vn_mknod (ie. allow negative dentries
336 : * with CI filesystems).
337 : */
338 : return NULL;
339 : }
340 :
341 : /* if exact match, just splice and exit */
342 564695 : if (!ci_name.name)
343 80167 : return d_splice_alias(VFS_I(ip), dentry);
344 :
345 : /* else case-insensitive match... */
346 484528 : dname.name = ci_name.name;
347 484528 : dname.len = ci_name.len;
348 484528 : dentry = d_add_ci(dentry, VFS_I(ip), &dname);
349 484528 : kmem_free(ci_name.name);
350 484528 : return dentry;
351 : }
352 :
353 : STATIC int
354 8335194 : xfs_vn_link(
355 : struct dentry *old_dentry,
356 : struct inode *dir,
357 : struct dentry *dentry)
358 : {
359 8335194 : struct inode *inode = d_inode(old_dentry);
360 8335194 : struct xfs_name name;
361 8335194 : int error;
362 :
363 8335194 : error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
364 8335366 : if (unlikely(error))
365 : return error;
366 :
367 8335366 : error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
368 8335640 : if (unlikely(error))
369 : return error;
370 :
371 8335471 : ihold(inode);
372 8335546 : d_instantiate(dentry, inode);
373 8335546 : return 0;
374 : }
375 :
376 : STATIC int
377 56592665 : xfs_vn_unlink(
378 : struct inode *dir,
379 : struct dentry *dentry)
380 : {
381 56592665 : struct xfs_name name;
382 56592665 : int error;
383 :
384 56592665 : xfs_dentry_to_name(&name, dentry);
385 :
386 56592665 : error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
387 56586797 : if (error)
388 : return error;
389 :
390 : /*
391 : * With unlink, the VFS makes the dentry "negative": no inode,
392 : * but still hashed. This is incompatible with case-insensitive
393 : * mode, so invalidate (unhash) the dentry in CI-mode.
394 : */
395 54580735 : if (xfs_has_asciici(XFS_M(dir->i_sb)))
396 207020 : d_invalidate(dentry);
397 : return 0;
398 : }
399 :
400 : STATIC int
401 295472529 : xfs_vn_symlink(
402 : struct mnt_idmap *idmap,
403 : struct inode *dir,
404 : struct dentry *dentry,
405 : const char *symname)
406 : {
407 295472529 : struct inode *inode;
408 295472529 : struct xfs_inode *cip = NULL;
409 295472529 : struct xfs_name name;
410 295472529 : int error;
411 295472529 : umode_t mode;
412 :
413 295472529 : mode = S_IFLNK |
414 295472529 : (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
415 295472529 : error = xfs_dentry_mode_to_name(&name, dentry, mode);
416 295221277 : if (unlikely(error))
417 0 : goto out;
418 :
419 295221277 : error = xfs_symlink(idmap, XFS_I(dir), &name, symname, mode, &cip);
420 295709410 : if (unlikely(error))
421 270009909 : goto out;
422 :
423 25699501 : inode = VFS_I(cip);
424 :
425 25699501 : error = xfs_inode_init_security(inode, dir, &dentry->d_name);
426 25699501 : if (unlikely(error))
427 : goto out_cleanup_inode;
428 :
429 25699501 : xfs_setup_iops(cip);
430 :
431 25648835 : d_instantiate(dentry, inode);
432 25723783 : xfs_finish_inode_setup(cip);
433 25723783 : return 0;
434 :
435 : out_cleanup_inode:
436 : xfs_finish_inode_setup(cip);
437 : xfs_cleanup_inode(dir, inode, dentry);
438 : xfs_irele(cip);
439 : out:
440 : return error;
441 : }
442 :
443 : STATIC int
444 46056944 : xfs_vn_rename(
445 : struct mnt_idmap *idmap,
446 : struct inode *odir,
447 : struct dentry *odentry,
448 : struct inode *ndir,
449 : struct dentry *ndentry,
450 : unsigned int flags)
451 : {
452 46056944 : struct inode *new_inode = d_inode(ndentry);
453 46056944 : int omode = 0;
454 46056944 : int error;
455 46056944 : struct xfs_name oname;
456 46056944 : struct xfs_name nname;
457 :
458 46056944 : if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
459 : return -EINVAL;
460 :
461 : /* if we are exchanging files, we need to set i_mode of both files */
462 46056944 : if (flags & RENAME_EXCHANGE)
463 12931925 : omode = d_inode(ndentry)->i_mode;
464 :
465 46056944 : error = xfs_dentry_mode_to_name(&oname, odentry, omode);
466 46056716 : if (omode && unlikely(error))
467 : return error;
468 :
469 46056716 : error = xfs_dentry_mode_to_name(&nname, ndentry,
470 46056716 : d_inode(odentry)->i_mode);
471 46056737 : if (unlikely(error))
472 : return error;
473 :
474 59602437 : return xfs_rename(idmap, XFS_I(odir), &oname,
475 : XFS_I(d_inode(odentry)), XFS_I(ndir), &nname,
476 : new_inode ? XFS_I(new_inode) : NULL, flags);
477 : }
478 :
479 : /*
480 : * careful here - this function can get called recursively, so
481 : * we need to be very careful about how much stack we use.
482 : * uio is kmalloced for this reason...
483 : */
484 : STATIC const char *
485 244422679 : xfs_vn_get_link(
486 : struct dentry *dentry,
487 : struct inode *inode,
488 : struct delayed_call *done)
489 : {
490 244422679 : char *link;
491 244422679 : int error = -ENOMEM;
492 :
493 244422679 : if (!dentry)
494 : return ERR_PTR(-ECHILD);
495 :
496 244369090 : link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
497 244575547 : if (!link)
498 0 : goto out_err;
499 :
500 244575547 : error = xfs_readlink(XFS_I(d_inode(dentry)), link);
501 244580263 : if (unlikely(error))
502 47 : goto out_kfree;
503 :
504 244580216 : set_delayed_call(done, kfree_link, link);
505 244580216 : return link;
506 :
507 : out_kfree:
508 47 : kfree(link);
509 47 : out_err:
510 47 : return ERR_PTR(error);
511 : }
512 :
513 : static uint32_t
514 1557027201 : xfs_stat_blksize(
515 : struct xfs_inode *ip)
516 : {
517 1557027201 : struct xfs_mount *mp = ip->i_mount;
518 :
519 : /*
520 : * If the file blocks are being allocated from a realtime volume, then
521 : * always return the realtime extent size.
522 : */
523 1557027201 : if (XFS_IS_REALTIME_INODE(ip))
524 156456501 : return XFS_FSB_TO_B(mp, xfs_get_extsz_hint(ip));
525 :
526 : /*
527 : * Allow large block sizes to be reported to userspace programs if the
528 : * "largeio" mount option is used.
529 : *
530 : * If compatibility mode is specified, simply return the basic unit of
531 : * caching so that we don't get inefficient read/modify/write I/O from
532 : * user apps. Otherwise....
533 : *
534 : * If the underlying volume is a stripe, then return the stripe width in
535 : * bytes as the recommended I/O size. It is not a stripe and we've set a
536 : * default buffered I/O size, return that, otherwise return the compat
537 : * default.
538 : */
539 1400570700 : if (xfs_has_large_iosize(mp)) {
540 10 : if (mp->m_swidth)
541 0 : return XFS_FSB_TO_B(mp, mp->m_swidth);
542 10 : if (xfs_has_allocsize(mp))
543 0 : return 1U << mp->m_allocsize_log;
544 : }
545 :
546 : return PAGE_SIZE;
547 : }
548 :
549 : STATIC int
550 1561283630 : xfs_vn_getattr(
551 : struct mnt_idmap *idmap,
552 : const struct path *path,
553 : struct kstat *stat,
554 : u32 request_mask,
555 : unsigned int query_flags)
556 : {
557 1561283630 : struct inode *inode = d_inode(path->dentry);
558 1561283630 : struct xfs_inode *ip = XFS_I(inode);
559 1561283630 : struct xfs_mount *mp = ip->i_mount;
560 1561283630 : vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
561 1558141828 : vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
562 :
563 1559178487 : trace_xfs_getattr(ip);
564 :
565 3123575150 : if (xfs_is_shutdown(mp))
566 : return -EIO;
567 :
568 1561753094 : stat->size = XFS_ISIZE(ip);
569 1561753094 : stat->dev = inode->i_sb->s_dev;
570 1561753094 : stat->mode = inode->i_mode;
571 1561753094 : stat->nlink = inode->i_nlink;
572 1561753094 : stat->uid = vfsuid_into_kuid(vfsuid);
573 1561753094 : stat->gid = vfsgid_into_kgid(vfsgid);
574 1561753094 : stat->ino = ip->i_ino;
575 1561753094 : stat->atime = inode->i_atime;
576 1561753094 : stat->mtime = inode->i_mtime;
577 1561753094 : stat->ctime = inode->i_ctime;
578 1561753094 : stat->blocks = XFS_FSB_TO_BB(mp, ip->i_nblocks + ip->i_delayed_blks);
579 :
580 1561753094 : if (xfs_has_v3inodes(mp)) {
581 1560108837 : if (request_mask & STATX_BTIME) {
582 1960995 : stat->result_mask |= STATX_BTIME;
583 1960995 : stat->btime = ip->i_crtime;
584 : }
585 : }
586 :
587 : /*
588 : * Note: If you add another clause to set an attribute flag, please
589 : * update attributes_mask below.
590 : */
591 1561753094 : if (ip->i_diflags & XFS_DIFLAG_IMMUTABLE)
592 1842 : stat->attributes |= STATX_ATTR_IMMUTABLE;
593 1561753094 : if (ip->i_diflags & XFS_DIFLAG_APPEND)
594 1765 : stat->attributes |= STATX_ATTR_APPEND;
595 1561753094 : if (ip->i_diflags & XFS_DIFLAG_NODUMP)
596 423 : stat->attributes |= STATX_ATTR_NODUMP;
597 :
598 1561753094 : stat->attributes_mask |= (STATX_ATTR_IMMUTABLE |
599 : STATX_ATTR_APPEND |
600 : STATX_ATTR_NODUMP);
601 :
602 1561753094 : switch (inode->i_mode & S_IFMT) {
603 2005866 : case S_IFBLK:
604 : case S_IFCHR:
605 2005866 : stat->blksize = BLKDEV_IOSIZE;
606 2005866 : stat->rdev = inode->i_rdev;
607 2005866 : break;
608 411159621 : case S_IFREG:
609 411159621 : if (request_mask & STATX_DIOALIGN) {
610 0 : struct xfs_buftarg *target = xfs_inode_buftarg(ip);
611 0 : struct block_device *bdev = target->bt_bdev;
612 :
613 0 : stat->result_mask |= STATX_DIOALIGN;
614 0 : stat->dio_mem_align = bdev_dma_alignment(bdev) + 1;
615 0 : stat->dio_offset_align = bdev_logical_block_size(bdev);
616 : }
617 1559747228 : fallthrough;
618 : default:
619 1559747228 : stat->blksize = xfs_stat_blksize(ip);
620 1557120321 : stat->rdev = 0;
621 1557120321 : break;
622 : }
623 :
624 : return 0;
625 : }
626 :
627 : static int
628 43666850 : xfs_vn_change_ok(
629 : struct mnt_idmap *idmap,
630 : struct dentry *dentry,
631 : struct iattr *iattr)
632 : {
633 43666850 : struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
634 :
635 87333700 : if (xfs_is_readonly(mp))
636 : return -EROFS;
637 :
638 87333700 : if (xfs_is_shutdown(mp))
639 : return -EIO;
640 :
641 43664751 : return setattr_prepare(idmap, dentry, iattr);
642 : }
643 :
644 : /*
645 : * Set non-size attributes of an inode.
646 : *
647 : * Caution: The caller of this function is responsible for calling
648 : * setattr_prepare() or otherwise verifying the change is fine.
649 : */
650 : static int
651 28563476 : xfs_setattr_nonsize(
652 : struct mnt_idmap *idmap,
653 : struct dentry *dentry,
654 : struct xfs_inode *ip,
655 : struct iattr *iattr)
656 : {
657 28563476 : xfs_mount_t *mp = ip->i_mount;
658 28563476 : struct inode *inode = VFS_I(ip);
659 28563476 : int mask = iattr->ia_valid;
660 28563476 : xfs_trans_t *tp;
661 28563476 : int error;
662 28563476 : kuid_t uid = GLOBAL_ROOT_UID;
663 28563476 : kgid_t gid = GLOBAL_ROOT_GID;
664 28563476 : struct xfs_dquot *udqp = NULL, *gdqp = NULL;
665 28563476 : struct xfs_dquot *old_udqp = NULL, *old_gdqp = NULL;
666 :
667 28563476 : ASSERT((mask & ATTR_SIZE) == 0);
668 :
669 : /*
670 : * If disk quotas is on, we make sure that the dquots do exist on disk,
671 : * before we start any other transactions. Trying to do this later
672 : * is messy. We don't care to take a readlock to look at the ids
673 : * in inode here, because we can't hold it across the trans_reserve.
674 : * If the IDs do change before we take the ilock, we're covered
675 : * because the i_*dquot fields will get updated anyway.
676 : */
677 28563476 : if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
678 7432301 : uint qflags = 0;
679 :
680 7432301 : if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
681 7431870 : uid = from_vfsuid(idmap, i_user_ns(inode),
682 : iattr->ia_vfsuid);
683 7431870 : qflags |= XFS_QMOPT_UQUOTA;
684 : } else {
685 431 : uid = inode->i_uid;
686 : }
687 7434094 : if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
688 7433112 : gid = from_vfsgid(idmap, i_user_ns(inode),
689 : iattr->ia_vfsgid);
690 7409198 : qflags |= XFS_QMOPT_GQUOTA;
691 : } else {
692 2644 : gid = inode->i_gid;
693 : }
694 :
695 : /*
696 : * We take a reference when we initialize udqp and gdqp,
697 : * so it is important that we never blindly double trip on
698 : * the same variable. See xfs_create() for an example.
699 : */
700 7410180 : ASSERT(udqp == NULL);
701 7410180 : ASSERT(gdqp == NULL);
702 7410180 : error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_projid,
703 : qflags, &udqp, &gdqp, NULL);
704 7524486 : if (error)
705 : return error;
706 : }
707 :
708 28621392 : error = xfs_trans_alloc_ichange(ip, udqp, gdqp, NULL,
709 28621392 : has_capability_noaudit(current, CAP_FOWNER), &tp);
710 28649926 : if (error)
711 286 : goto out_dqrele;
712 :
713 : /*
714 : * Register quota modifications in the transaction. Must be the owner
715 : * or privileged. These IDs could have changed since we last looked at
716 : * them. But, we're assured that if the ownership did change while we
717 : * didn't have the inode locked, inode's dquot(s) would have changed
718 : * also.
719 : */
720 42177603 : if (XFS_IS_UQUOTA_ON(mp) &&
721 13528624 : i_uid_needs_update(idmap, iattr, inode)) {
722 7177228 : ASSERT(udqp);
723 7177228 : old_udqp = xfs_qm_vop_chown(tp, ip, &ip->i_udquot, udqp);
724 : }
725 42161083 : if (XFS_IS_GQUOTA_ON(mp) &&
726 13515762 : i_gid_needs_update(idmap, iattr, inode)) {
727 7168114 : ASSERT(xfs_has_pquotino(mp) || !XFS_IS_PQUOTA_ON(mp));
728 7168114 : ASSERT(gdqp);
729 7168114 : old_gdqp = xfs_qm_vop_chown(tp, ip, &ip->i_gdquot, gdqp);
730 : }
731 :
732 28646538 : setattr_copy(idmap, inode, iattr);
733 28636392 : xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
734 :
735 28700653 : XFS_STATS_INC(mp, xs_ig_attrchg);
736 :
737 28706263 : if (xfs_has_wsync(mp))
738 942 : xfs_trans_set_sync(tp);
739 28706263 : error = xfs_trans_commit(tp);
740 :
741 : /*
742 : * Release any dquot(s) the inode had kept before chown.
743 : */
744 28684379 : xfs_qm_dqrele(old_udqp);
745 28657662 : xfs_qm_dqrele(old_gdqp);
746 28661154 : xfs_qm_dqrele(udqp);
747 28668978 : xfs_qm_dqrele(gdqp);
748 :
749 28672158 : if (error)
750 : return error;
751 :
752 : /*
753 : * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
754 : * update. We could avoid this with linked transactions
755 : * and passing down the transaction pointer all the way
756 : * to attr_set. No previous user of the generic
757 : * Posix ACL code seems to care about this issue either.
758 : */
759 28672158 : if (mask & ATTR_MODE) {
760 459805 : error = posix_acl_chmod(idmap, dentry, inode->i_mode);
761 459787 : if (error)
762 0 : return error;
763 : }
764 :
765 : return 0;
766 :
767 : out_dqrele:
768 286 : xfs_qm_dqrele(udqp);
769 286 : xfs_qm_dqrele(gdqp);
770 286 : return error;
771 : }
772 :
773 : /*
774 : * Truncate file. Must have write permission and not be a directory.
775 : *
776 : * Caution: The caller of this function is responsible for calling
777 : * setattr_prepare() or otherwise verifying the change is fine.
778 : */
779 : STATIC int
780 15558177 : xfs_setattr_size(
781 : struct mnt_idmap *idmap,
782 : struct dentry *dentry,
783 : struct xfs_inode *ip,
784 : struct iattr *iattr)
785 : {
786 15558177 : struct xfs_mount *mp = ip->i_mount;
787 15558177 : struct inode *inode = VFS_I(ip);
788 15558177 : xfs_off_t oldsize, newsize;
789 15558177 : struct xfs_trans *tp;
790 15558177 : int error;
791 15558177 : uint lock_flags = 0;
792 15558177 : bool did_zeroing = false;
793 :
794 15558177 : ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
795 15557670 : ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
796 15558020 : ASSERT(S_ISREG(inode->i_mode));
797 15558020 : ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
798 : ATTR_MTIME_SET|ATTR_TIMES_SET)) == 0);
799 :
800 15558020 : oldsize = inode->i_size;
801 15558020 : newsize = iattr->ia_size;
802 :
803 : /*
804 : * Short circuit the truncate case for zero length files.
805 : */
806 15558020 : if (newsize == 0 && oldsize == 0 && ip->i_df.if_nextents == 0) {
807 556629 : if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
808 : return 0;
809 :
810 : /*
811 : * Use the regular setattr path to update the timestamps.
812 : */
813 556573 : iattr->ia_valid &= ~ATTR_SIZE;
814 556573 : return xfs_setattr_nonsize(idmap, dentry, ip, iattr);
815 : }
816 :
817 : /*
818 : * Make sure that the dquots are attached to the inode.
819 : */
820 15001391 : error = xfs_qm_dqattach(ip);
821 15001290 : if (error)
822 : return error;
823 :
824 : /*
825 : * Wait for all direct I/O to complete.
826 : */
827 15000005 : inode_dio_wait(inode);
828 :
829 : /*
830 : * File data changes must be complete before we start the transaction to
831 : * modify the inode. This needs to be done before joining the inode to
832 : * the transaction because the inode cannot be unlocked once it is a
833 : * part of the transaction.
834 : *
835 : * Start with zeroing any data beyond EOF that we may expose on file
836 : * extension, or zeroing out the rest of the block on a downward
837 : * truncate.
838 : */
839 15000155 : if (newsize > oldsize) {
840 8733860 : trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
841 8733857 : error = xfs_zero_range(ip, oldsize, newsize - oldsize,
842 : &did_zeroing);
843 : } else {
844 : /*
845 : * iomap won't detect a dirty page over an unwritten block (or a
846 : * cow block over a hole) and subsequently skips zeroing the
847 : * newly post-EOF portion of the page. Flush the new EOF to
848 : * convert the block before the pagecache truncate.
849 : */
850 6266295 : error = filemap_write_and_wait_range(inode->i_mapping, newsize,
851 : newsize);
852 6266378 : if (error)
853 : return error;
854 6266330 : error = xfs_truncate_page(ip, newsize, &did_zeroing);
855 : }
856 :
857 15000089 : if (error)
858 : return error;
859 :
860 : /*
861 : * We've already locked out new page faults, so now we can safely remove
862 : * pages from the page cache knowing they won't get refaulted until we
863 : * drop the XFS_MMAP_EXCL lock after the extent manipulations are
864 : * complete. The truncate_setsize() call also cleans partial EOF page
865 : * PTEs on extending truncates and hence ensures sub-page block size
866 : * filesystems are correctly handled, too.
867 : *
868 : * We have to do all the page cache truncate work outside the
869 : * transaction context as the "lock" order is page lock->log space
870 : * reservation as defined by extent allocation in the writeback path.
871 : * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
872 : * having already truncated the in-memory version of the file (i.e. made
873 : * user visible changes). There's not much we can do about this, except
874 : * to hope that the caller sees ENOMEM and retries the truncate
875 : * operation.
876 : *
877 : * And we update in-core i_size and truncate page cache beyond newsize
878 : * before writeback the [i_disk_size, newsize] range, so we're
879 : * guaranteed not to write stale data past the new EOF on truncate down.
880 : */
881 14997109 : truncate_setsize(inode, newsize);
882 :
883 : /*
884 : * We are going to log the inode size change in this transaction so
885 : * any previous writes that are beyond the on disk EOF and the new
886 : * EOF that have not been written out need to be written here. If we
887 : * do not write the data out, we expose ourselves to the null files
888 : * problem. Note that this includes any block zeroing we did above;
889 : * otherwise those blocks may not be zeroed after a crash.
890 : */
891 14997114 : if (did_zeroing ||
892 9500254 : (newsize > ip->i_disk_size && oldsize != ip->i_disk_size)) {
893 5786019 : error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
894 : ip->i_disk_size, newsize - 1);
895 5786072 : if (error)
896 : return error;
897 : }
898 :
899 14996314 : error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
900 14996285 : if (error)
901 : return error;
902 :
903 14996230 : lock_flags |= XFS_ILOCK_EXCL;
904 14996230 : xfs_ilock(ip, XFS_ILOCK_EXCL);
905 14996256 : xfs_trans_ijoin(tp, ip, 0);
906 :
907 : /*
908 : * Only change the c/mtime if we are changing the size or we are
909 : * explicitly asked to change it. This handles the semantic difference
910 : * between truncate() and ftruncate() as implemented in the VFS.
911 : *
912 : * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
913 : * special case where we need to update the times despite not having
914 : * these flags set. For all other operations the VFS set these flags
915 : * explicitly if it wants a timestamp update.
916 : */
917 14996300 : if (newsize != oldsize &&
918 14913518 : !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
919 22126338 : iattr->ia_ctime = iattr->ia_mtime =
920 11063135 : current_time(inode);
921 11063203 : iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
922 : }
923 :
924 : /*
925 : * The first thing we do is set the size to new_size permanently on
926 : * disk. This way we don't have to worry about anyone ever being able
927 : * to look at the data being freed even in the face of a crash.
928 : * What we're getting around here is the case where we free a block, it
929 : * is allocated to another file, it is written to, and then we crash.
930 : * If the new data gets written to the file but the log buffers
931 : * containing the free and reallocation don't, then we'd end up with
932 : * garbage in the blocks being freed. As long as we make the new size
933 : * permanent before actually freeing any blocks it doesn't matter if
934 : * they get written to.
935 : */
936 14996368 : ip->i_disk_size = newsize;
937 14996368 : xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
938 :
939 14996579 : if (newsize <= oldsize) {
940 6265213 : error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
941 6265274 : if (error)
942 786 : goto out_trans_cancel;
943 :
944 : /*
945 : * Truncated "down", so we're removing references to old data
946 : * here - if we delay flushing for a long time, we expose
947 : * ourselves unduly to the notorious NULL files problem. So,
948 : * we mark this inode and flush it when the file is closed,
949 : * and do not wait the usual (long) time for writeout.
950 : */
951 6264488 : xfs_iflags_set(ip, XFS_ITRUNCATED);
952 :
953 : /* A truncate down always removes post-EOF blocks. */
954 6264460 : xfs_inode_clear_eofblocks_tag(ip);
955 : }
956 :
957 14995833 : ASSERT(!(iattr->ia_valid & (ATTR_UID | ATTR_GID)));
958 14995833 : setattr_copy(idmap, inode, iattr);
959 14995730 : xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
960 :
961 14995878 : XFS_STATS_INC(mp, xs_ig_attrchg);
962 :
963 14995878 : if (xfs_has_wsync(mp))
964 0 : xfs_trans_set_sync(tp);
965 :
966 14995878 : error = xfs_trans_commit(tp);
967 14996398 : out_unlock:
968 14996398 : if (lock_flags)
969 14996398 : xfs_iunlock(ip, lock_flags);
970 14996398 : return error;
971 :
972 : out_trans_cancel:
973 786 : xfs_trans_cancel(tp);
974 786 : goto out_unlock;
975 : }
976 :
977 : int
978 15558509 : xfs_vn_setattr_size(
979 : struct mnt_idmap *idmap,
980 : struct dentry *dentry,
981 : struct iattr *iattr)
982 : {
983 15558509 : struct xfs_inode *ip = XFS_I(d_inode(dentry));
984 15558509 : int error;
985 :
986 15558509 : trace_xfs_setattr(ip);
987 :
988 15557933 : error = xfs_vn_change_ok(idmap, dentry, iattr);
989 15558177 : if (error)
990 : return error;
991 15558145 : return xfs_setattr_size(idmap, dentry, ip, iattr);
992 : }
993 :
994 : STATIC int
995 35330129 : xfs_vn_setattr(
996 : struct mnt_idmap *idmap,
997 : struct dentry *dentry,
998 : struct iattr *iattr)
999 : {
1000 35330129 : struct inode *inode = d_inode(dentry);
1001 35330129 : struct xfs_inode *ip = XFS_I(inode);
1002 35330129 : int error;
1003 :
1004 35330129 : if (iattr->ia_valid & ATTR_SIZE) {
1005 7193140 : uint iolock;
1006 :
1007 7193140 : xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1008 7192886 : iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1009 :
1010 7192886 : error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1011 7193229 : if (error) {
1012 0 : xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1013 0 : return error;
1014 : }
1015 :
1016 7193229 : error = xfs_vn_setattr_size(idmap, dentry, iattr);
1017 7193215 : xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1018 : } else {
1019 28136989 : trace_xfs_setattr(ip);
1020 :
1021 28101442 : error = xfs_vn_change_ok(idmap, dentry, iattr);
1022 28041921 : if (!error)
1023 28033583 : error = xfs_setattr_nonsize(idmap, dentry, ip, iattr);
1024 : }
1025 :
1026 : return error;
1027 : }
1028 :
1029 : STATIC int
1030 95315341 : xfs_vn_update_time(
1031 : struct inode *inode,
1032 : struct timespec64 *now,
1033 : int flags)
1034 : {
1035 95315341 : struct xfs_inode *ip = XFS_I(inode);
1036 95315341 : struct xfs_mount *mp = ip->i_mount;
1037 95315341 : int log_flags = XFS_ILOG_TIMESTAMP;
1038 95315341 : struct xfs_trans *tp;
1039 95315341 : int error;
1040 :
1041 95315341 : trace_xfs_update_time(ip);
1042 :
1043 95268980 : if (inode->i_sb->s_flags & SB_LAZYTIME) {
1044 264 : if (!((flags & S_VERSION) &&
1045 66 : inode_maybe_inc_iversion(inode, false)))
1046 132 : return generic_update_time(inode, now, flags);
1047 :
1048 : /* Capture the iversion update that just occurred */
1049 : log_flags |= XFS_ILOG_CORE;
1050 : }
1051 :
1052 95268848 : error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1053 95250146 : if (error)
1054 : return error;
1055 :
1056 95247886 : xfs_ilock(ip, XFS_ILOCK_EXCL);
1057 95286860 : if (flags & S_CTIME)
1058 43669818 : inode->i_ctime = *now;
1059 95286860 : if (flags & S_MTIME)
1060 43940502 : inode->i_mtime = *now;
1061 95286860 : if (flags & S_ATIME)
1062 51344154 : inode->i_atime = *now;
1063 :
1064 95286860 : xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1065 95288267 : xfs_trans_log_inode(tp, ip, log_flags);
1066 95349850 : return xfs_trans_commit(tp);
1067 : }
1068 :
1069 : STATIC int
1070 1547387 : xfs_vn_fiemap(
1071 : struct inode *inode,
1072 : struct fiemap_extent_info *fieinfo,
1073 : u64 start,
1074 : u64 length)
1075 : {
1076 1547387 : int error;
1077 :
1078 1547387 : xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1079 1547408 : if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1080 619575 : fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1081 619575 : error = iomap_fiemap(inode, fieinfo, start, length,
1082 : &xfs_xattr_iomap_ops);
1083 : } else {
1084 927833 : error = iomap_fiemap(inode, fieinfo, start, length,
1085 : &xfs_read_iomap_ops);
1086 : }
1087 1547412 : xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1088 :
1089 1547417 : return error;
1090 : }
1091 :
1092 : STATIC int
1093 7542991 : xfs_vn_tmpfile(
1094 : struct mnt_idmap *idmap,
1095 : struct inode *dir,
1096 : struct file *file,
1097 : umode_t mode)
1098 : {
1099 7542991 : int err = xfs_generic_create(idmap, dir, file->f_path.dentry, mode, 0, file);
1100 :
1101 7607123 : return finish_open_simple(file, err);
1102 : }
1103 :
1104 : static const struct inode_operations xfs_inode_operations = {
1105 : .get_inode_acl = xfs_get_acl,
1106 : .set_acl = xfs_set_acl,
1107 : .getattr = xfs_vn_getattr,
1108 : .setattr = xfs_vn_setattr,
1109 : .listxattr = xfs_vn_listxattr,
1110 : .fiemap = xfs_vn_fiemap,
1111 : .update_time = xfs_vn_update_time,
1112 : .fileattr_get = xfs_fileattr_get,
1113 : .fileattr_set = xfs_fileattr_set,
1114 : };
1115 :
1116 : static const struct inode_operations xfs_dir_inode_operations = {
1117 : .create = xfs_vn_create,
1118 : .lookup = xfs_vn_lookup,
1119 : .link = xfs_vn_link,
1120 : .unlink = xfs_vn_unlink,
1121 : .symlink = xfs_vn_symlink,
1122 : .mkdir = xfs_vn_mkdir,
1123 : /*
1124 : * Yes, XFS uses the same method for rmdir and unlink.
1125 : *
1126 : * There are some subtile differences deeper in the code,
1127 : * but we use S_ISDIR to check for those.
1128 : */
1129 : .rmdir = xfs_vn_unlink,
1130 : .mknod = xfs_vn_mknod,
1131 : .rename = xfs_vn_rename,
1132 : .get_inode_acl = xfs_get_acl,
1133 : .set_acl = xfs_set_acl,
1134 : .getattr = xfs_vn_getattr,
1135 : .setattr = xfs_vn_setattr,
1136 : .listxattr = xfs_vn_listxattr,
1137 : .update_time = xfs_vn_update_time,
1138 : .tmpfile = xfs_vn_tmpfile,
1139 : .fileattr_get = xfs_fileattr_get,
1140 : .fileattr_set = xfs_fileattr_set,
1141 : };
1142 :
1143 : static const struct inode_operations xfs_dir_ci_inode_operations = {
1144 : .create = xfs_vn_create,
1145 : .lookup = xfs_vn_ci_lookup,
1146 : .link = xfs_vn_link,
1147 : .unlink = xfs_vn_unlink,
1148 : .symlink = xfs_vn_symlink,
1149 : .mkdir = xfs_vn_mkdir,
1150 : /*
1151 : * Yes, XFS uses the same method for rmdir and unlink.
1152 : *
1153 : * There are some subtile differences deeper in the code,
1154 : * but we use S_ISDIR to check for those.
1155 : */
1156 : .rmdir = xfs_vn_unlink,
1157 : .mknod = xfs_vn_mknod,
1158 : .rename = xfs_vn_rename,
1159 : .get_inode_acl = xfs_get_acl,
1160 : .set_acl = xfs_set_acl,
1161 : .getattr = xfs_vn_getattr,
1162 : .setattr = xfs_vn_setattr,
1163 : .listxattr = xfs_vn_listxattr,
1164 : .update_time = xfs_vn_update_time,
1165 : .tmpfile = xfs_vn_tmpfile,
1166 : .fileattr_get = xfs_fileattr_get,
1167 : .fileattr_set = xfs_fileattr_set,
1168 : };
1169 :
1170 : static const struct inode_operations xfs_symlink_inode_operations = {
1171 : .get_link = xfs_vn_get_link,
1172 : .getattr = xfs_vn_getattr,
1173 : .setattr = xfs_vn_setattr,
1174 : .listxattr = xfs_vn_listxattr,
1175 : .update_time = xfs_vn_update_time,
1176 : };
1177 :
1178 : /* Figure out if this file actually supports DAX. */
1179 : static bool
1180 1085989648 : xfs_inode_supports_dax(
1181 : struct xfs_inode *ip)
1182 : {
1183 1085989648 : struct xfs_mount *mp = ip->i_mount;
1184 :
1185 : /* Only supported on regular files. */
1186 1085989648 : if (!S_ISREG(VFS_I(ip)->i_mode))
1187 : return false;
1188 :
1189 : /* Block size must match page size */
1190 405405277 : if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1191 : return false;
1192 :
1193 : /* Device has to support DAX too. */
1194 405320130 : return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
1195 : }
1196 :
1197 : static bool
1198 1085771758 : xfs_inode_should_enable_dax(
1199 : struct xfs_inode *ip)
1200 : {
1201 1085771758 : if (!IS_ENABLED(CONFIG_FS_DAX))
1202 : return false;
1203 1085771758 : if (xfs_has_dax_never(ip->i_mount))
1204 : return false;
1205 1085771323 : if (!xfs_inode_supports_dax(ip))
1206 : return false;
1207 0 : if (xfs_has_dax_always(ip->i_mount))
1208 : return true;
1209 0 : if (ip->i_diflags2 & XFS_DIFLAG2_DAX)
1210 0 : return true;
1211 : return false;
1212 : }
1213 :
1214 : void
1215 1087717724 : xfs_diflags_to_iflags(
1216 : struct xfs_inode *ip,
1217 : bool init)
1218 : {
1219 1087717724 : struct inode *inode = VFS_I(ip);
1220 1087717724 : unsigned int xflags = xfs_ip2xflags(ip);
1221 1087161995 : unsigned int flags = 0;
1222 :
1223 1087161995 : ASSERT(!(IS_DAX(inode) && init));
1224 :
1225 1087161995 : if (xflags & FS_XFLAG_IMMUTABLE)
1226 279 : flags |= S_IMMUTABLE;
1227 1087161995 : if (xflags & FS_XFLAG_APPEND)
1228 256 : flags |= S_APPEND;
1229 1087161995 : if (xflags & FS_XFLAG_SYNC)
1230 1820 : flags |= S_SYNC;
1231 1087161995 : if (xflags & FS_XFLAG_NOATIME)
1232 79 : flags |= S_NOATIME;
1233 1087161995 : if (init && xfs_inode_should_enable_dax(ip))
1234 0 : flags |= S_DAX;
1235 :
1236 : /*
1237 : * S_DAX can only be set during inode initialization and is never set by
1238 : * the VFS, so we cannot mask off S_DAX in i_flags.
1239 : */
1240 1087161995 : inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME);
1241 1087161995 : inode->i_flags |= flags;
1242 1087161995 : }
1243 :
1244 : /*
1245 : * Initialize the Linux inode.
1246 : *
1247 : * When reading existing inodes from disk this is called directly from xfs_iget,
1248 : * when creating a new inode it is called from xfs_init_new_inode after setting
1249 : * up the inode. These callers have different criteria for clearing XFS_INEW, so
1250 : * leave it up to the caller to deal with unlocking the inode appropriately.
1251 : */
1252 : void
1253 1085929282 : xfs_setup_inode(
1254 : struct xfs_inode *ip)
1255 : {
1256 1085929282 : struct inode *inode = &ip->i_vnode;
1257 1085929282 : gfp_t gfp_mask;
1258 :
1259 1085929282 : inode->i_ino = ip->i_ino;
1260 1085929282 : inode->i_state |= I_NEW;
1261 :
1262 1085929282 : inode_sb_list_add(inode);
1263 : /* make the inode look hashed for the writeback code */
1264 1087355288 : inode_fake_hash(inode);
1265 :
1266 1087355288 : i_size_write(inode, ip->i_disk_size);
1267 1087355288 : xfs_diflags_to_iflags(ip, true);
1268 :
1269 1085642670 : if (S_ISDIR(inode->i_mode)) {
1270 : /*
1271 : * We set the i_rwsem class here to avoid potential races with
1272 : * lockdep_annotate_inode_mutex_key() reinitialising the lock
1273 : * after a filehandle lookup has already found the inode in
1274 : * cache before it has been unlocked via unlock_new_inode().
1275 : */
1276 : lockdep_set_class(&inode->i_rwsem,
1277 : &inode->i_sb->s_type->i_mutex_dir_key);
1278 : lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1279 : } else {
1280 1085642670 : lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1281 : }
1282 :
1283 : /*
1284 : * Ensure all page cache allocations are done from GFP_NOFS context to
1285 : * prevent direct reclaim recursion back into the filesystem and blowing
1286 : * stacks or deadlocking.
1287 : */
1288 1085642670 : gfp_mask = mapping_gfp_mask(inode->i_mapping);
1289 1085642670 : mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1290 :
1291 : /*
1292 : * If there is no attribute fork no ACL can exist on this inode,
1293 : * and it can't have any file capabilities attached to it either.
1294 : */
1295 1085642670 : if (!xfs_inode_has_attr_fork(ip)) {
1296 988848179 : inode_has_no_xattr(inode);
1297 989011754 : cache_no_acl(inode);
1298 : }
1299 1085806245 : }
1300 :
1301 : void
1302 1086411245 : xfs_setup_iops(
1303 : struct xfs_inode *ip)
1304 : {
1305 1086411245 : struct inode *inode = &ip->i_vnode;
1306 :
1307 1086411245 : switch (inode->i_mode & S_IFMT) {
1308 405488160 : case S_IFREG:
1309 405488160 : inode->i_op = &xfs_inode_operations;
1310 405488160 : inode->i_fop = &xfs_file_operations;
1311 405488160 : if (IS_DAX(inode))
1312 0 : inode->i_mapping->a_ops = &xfs_dax_aops;
1313 : else
1314 405488160 : inode->i_mapping->a_ops = &xfs_address_space_operations;
1315 : break;
1316 171398009 : case S_IFDIR:
1317 171398009 : if (xfs_has_asciici(XFS_M(inode->i_sb)))
1318 616 : inode->i_op = &xfs_dir_ci_inode_operations;
1319 : else
1320 171397393 : inode->i_op = &xfs_dir_inode_operations;
1321 171398009 : inode->i_fop = &xfs_dir_file_operations;
1322 171398009 : break;
1323 88011419 : case S_IFLNK:
1324 88011419 : inode->i_op = &xfs_symlink_inode_operations;
1325 88011419 : break;
1326 421513657 : default:
1327 421513657 : inode->i_op = &xfs_inode_operations;
1328 421513657 : init_special_inode(inode, inode->i_mode, inode->i_rdev);
1329 421513657 : break;
1330 : }
1331 1086393938 : }
|
