~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/f2fs/xattr.c

Version: ~ [ linux-5.8 ] ~ [ linux-5.7.12 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.55 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.136 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.191 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.232 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.232 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * fs/f2fs/xattr.c
  3  *
  4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
  5  *             http://www.samsung.com/
  6  *
  7  * Portions of this code from linux/fs/ext2/xattr.c
  8  *
  9  * Copyright (C) 2001-2003 Andreas Gruenbacher <agruen@suse.de>
 10  *
 11  * Fix by Harrison Xing <harrison@mountainviewdata.com>.
 12  * Extended attributes for symlinks and special files added per
 13  *  suggestion of Luka Renko <luka.renko@hermes.si>.
 14  * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>,
 15  *  Red Hat Inc.
 16  *
 17  * This program is free software; you can redistribute it and/or modify
 18  * it under the terms of the GNU General Public License version 2 as
 19  * published by the Free Software Foundation.
 20  */
 21 #include <linux/rwsem.h>
 22 #include <linux/f2fs_fs.h>
 23 #include <linux/security.h>
 24 #include <linux/posix_acl_xattr.h>
 25 #include "f2fs.h"
 26 #include "xattr.h"
 27 
 28 static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
 29                 struct dentry *unused, struct inode *inode,
 30                 const char *name, void *buffer, size_t size)
 31 {
 32         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 33 
 34         switch (handler->flags) {
 35         case F2FS_XATTR_INDEX_USER:
 36                 if (!test_opt(sbi, XATTR_USER))
 37                         return -EOPNOTSUPP;
 38                 break;
 39         case F2FS_XATTR_INDEX_TRUSTED:
 40                 if (!capable(CAP_SYS_ADMIN))
 41                         return -EPERM;
 42                 break;
 43         case F2FS_XATTR_INDEX_SECURITY:
 44                 break;
 45         default:
 46                 return -EINVAL;
 47         }
 48         return f2fs_getxattr(inode, handler->flags, name,
 49                              buffer, size, NULL);
 50 }
 51 
 52 static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
 53                 struct dentry *unused, struct inode *inode,
 54                 const char *name, const void *value,
 55                 size_t size, int flags)
 56 {
 57         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 58 
 59         switch (handler->flags) {
 60         case F2FS_XATTR_INDEX_USER:
 61                 if (!test_opt(sbi, XATTR_USER))
 62                         return -EOPNOTSUPP;
 63                 break;
 64         case F2FS_XATTR_INDEX_TRUSTED:
 65                 if (!capable(CAP_SYS_ADMIN))
 66                         return -EPERM;
 67                 break;
 68         case F2FS_XATTR_INDEX_SECURITY:
 69                 break;
 70         default:
 71                 return -EINVAL;
 72         }
 73         return f2fs_setxattr(inode, handler->flags, name,
 74                                         value, size, NULL, flags);
 75 }
 76 
 77 static bool f2fs_xattr_user_list(struct dentry *dentry)
 78 {
 79         struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
 80 
 81         return test_opt(sbi, XATTR_USER);
 82 }
 83 
 84 static bool f2fs_xattr_trusted_list(struct dentry *dentry)
 85 {
 86         return capable(CAP_SYS_ADMIN);
 87 }
 88 
 89 static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
 90                 struct dentry *unused, struct inode *inode,
 91                 const char *name, void *buffer, size_t size)
 92 {
 93         if (buffer)
 94                 *((char *)buffer) = F2FS_I(inode)->i_advise;
 95         return sizeof(char);
 96 }
 97 
 98 static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
 99                 struct dentry *unused, struct inode *inode,
100                 const char *name, const void *value,
101                 size_t size, int flags)
102 {
103         if (!inode_owner_or_capable(inode))
104                 return -EPERM;
105         if (value == NULL)
106                 return -EINVAL;
107 
108         F2FS_I(inode)->i_advise |= *(char *)value;
109         f2fs_mark_inode_dirty_sync(inode, true);
110         return 0;
111 }
112 
113 #ifdef CONFIG_F2FS_FS_SECURITY
114 static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
115                 void *page)
116 {
117         const struct xattr *xattr;
118         int err = 0;
119 
120         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
121                 err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
122                                 xattr->name, xattr->value,
123                                 xattr->value_len, (struct page *)page, 0);
124                 if (err < 0)
125                         break;
126         }
127         return err;
128 }
129 
130 int f2fs_init_security(struct inode *inode, struct inode *dir,
131                                 const struct qstr *qstr, struct page *ipage)
132 {
133         return security_inode_init_security(inode, dir, qstr,
134                                 &f2fs_initxattrs, ipage);
135 }
136 #endif
137 
138 const struct xattr_handler f2fs_xattr_user_handler = {
139         .prefix = XATTR_USER_PREFIX,
140         .flags  = F2FS_XATTR_INDEX_USER,
141         .list   = f2fs_xattr_user_list,
142         .get    = f2fs_xattr_generic_get,
143         .set    = f2fs_xattr_generic_set,
144 };
145 
146 const struct xattr_handler f2fs_xattr_trusted_handler = {
147         .prefix = XATTR_TRUSTED_PREFIX,
148         .flags  = F2FS_XATTR_INDEX_TRUSTED,
149         .list   = f2fs_xattr_trusted_list,
150         .get    = f2fs_xattr_generic_get,
151         .set    = f2fs_xattr_generic_set,
152 };
153 
154 const struct xattr_handler f2fs_xattr_advise_handler = {
155         .name   = F2FS_SYSTEM_ADVISE_NAME,
156         .flags  = F2FS_XATTR_INDEX_ADVISE,
157         .get    = f2fs_xattr_advise_get,
158         .set    = f2fs_xattr_advise_set,
159 };
160 
161 const struct xattr_handler f2fs_xattr_security_handler = {
162         .prefix = XATTR_SECURITY_PREFIX,
163         .flags  = F2FS_XATTR_INDEX_SECURITY,
164         .get    = f2fs_xattr_generic_get,
165         .set    = f2fs_xattr_generic_set,
166 };
167 
168 static const struct xattr_handler *f2fs_xattr_handler_map[] = {
169         [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
170 #ifdef CONFIG_F2FS_FS_POSIX_ACL
171         [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
172         [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
173 #endif
174         [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
175 #ifdef CONFIG_F2FS_FS_SECURITY
176         [F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
177 #endif
178         [F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
179 };
180 
181 const struct xattr_handler *f2fs_xattr_handlers[] = {
182         &f2fs_xattr_user_handler,
183 #ifdef CONFIG_F2FS_FS_POSIX_ACL
184         &posix_acl_access_xattr_handler,
185         &posix_acl_default_xattr_handler,
186 #endif
187         &f2fs_xattr_trusted_handler,
188 #ifdef CONFIG_F2FS_FS_SECURITY
189         &f2fs_xattr_security_handler,
190 #endif
191         &f2fs_xattr_advise_handler,
192         NULL,
193 };
194 
195 static inline const struct xattr_handler *f2fs_xattr_handler(int index)
196 {
197         const struct xattr_handler *handler = NULL;
198 
199         if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map))
200                 handler = f2fs_xattr_handler_map[index];
201         return handler;
202 }
203 
204 static struct f2fs_xattr_entry *__find_xattr(void *base_addr, int index,
205                                         size_t len, const char *name)
206 {
207         struct f2fs_xattr_entry *entry;
208 
209         list_for_each_xattr(entry, base_addr) {
210                 if (entry->e_name_index != index)
211                         continue;
212                 if (entry->e_name_len != len)
213                         continue;
214                 if (!memcmp(entry->e_name, name, len))
215                         break;
216         }
217         return entry;
218 }
219 
220 static struct f2fs_xattr_entry *__find_inline_xattr(void *base_addr,
221                                         void **last_addr, int index,
222                                         size_t len, const char *name)
223 {
224         struct f2fs_xattr_entry *entry;
225         unsigned int inline_size = F2FS_INLINE_XATTR_ADDRS << 2;
226 
227         list_for_each_xattr(entry, base_addr) {
228                 if ((void *)entry + sizeof(__u32) > base_addr + inline_size ||
229                         (void *)XATTR_NEXT_ENTRY(entry) + sizeof(__u32) >
230                         base_addr + inline_size) {
231                         *last_addr = entry;
232                         return NULL;
233                 }
234                 if (entry->e_name_index != index)
235                         continue;
236                 if (entry->e_name_len != len)
237                         continue;
238                 if (!memcmp(entry->e_name, name, len))
239                         break;
240         }
241         return entry;
242 }
243 
244 static int lookup_all_xattrs(struct inode *inode, struct page *ipage,
245                                 unsigned int index, unsigned int len,
246                                 const char *name, struct f2fs_xattr_entry **xe,
247                                 void **base_addr)
248 {
249         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
250         void *cur_addr, *txattr_addr, *last_addr = NULL;
251         nid_t xnid = F2FS_I(inode)->i_xattr_nid;
252         unsigned int size = xnid ? VALID_XATTR_BLOCK_SIZE : 0;
253         unsigned int inline_size = inline_xattr_size(inode);
254         int err = 0;
255 
256         if (!size && !inline_size)
257                 return -ENODATA;
258 
259         txattr_addr = kzalloc(inline_size + size + XATTR_PADDING_SIZE,
260                                                         GFP_F2FS_ZERO);
261         if (!txattr_addr)
262                 return -ENOMEM;
263 
264         /* read from inline xattr */
265         if (inline_size) {
266                 struct page *page = NULL;
267                 void *inline_addr;
268 
269                 if (ipage) {
270                         inline_addr = inline_xattr_addr(ipage);
271                 } else {
272                         page = get_node_page(sbi, inode->i_ino);
273                         if (IS_ERR(page)) {
274                                 err = PTR_ERR(page);
275                                 goto out;
276                         }
277                         inline_addr = inline_xattr_addr(page);
278                 }
279                 memcpy(txattr_addr, inline_addr, inline_size);
280                 f2fs_put_page(page, 1);
281 
282                 *xe = __find_inline_xattr(txattr_addr, &last_addr,
283                                                 index, len, name);
284                 if (*xe)
285                         goto check;
286         }
287 
288         /* read from xattr node block */
289         if (xnid) {
290                 struct page *xpage;
291                 void *xattr_addr;
292 
293                 /* The inode already has an extended attribute block. */
294                 xpage = get_node_page(sbi, xnid);
295                 if (IS_ERR(xpage)) {
296                         err = PTR_ERR(xpage);
297                         goto out;
298                 }
299 
300                 xattr_addr = page_address(xpage);
301                 memcpy(txattr_addr + inline_size, xattr_addr, size);
302                 f2fs_put_page(xpage, 1);
303         }
304 
305         if (last_addr)
306                 cur_addr = XATTR_HDR(last_addr) - 1;
307         else
308                 cur_addr = txattr_addr;
309 
310         *xe = __find_xattr(cur_addr, index, len, name);
311 check:
312         if (IS_XATTR_LAST_ENTRY(*xe)) {
313                 err = -ENODATA;
314                 goto out;
315         }
316 
317         *base_addr = txattr_addr;
318         return 0;
319 out:
320         kzfree(txattr_addr);
321         return err;
322 }
323 
324 static int read_all_xattrs(struct inode *inode, struct page *ipage,
325                                                         void **base_addr)
326 {
327         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
328         struct f2fs_xattr_header *header;
329         nid_t xnid = F2FS_I(inode)->i_xattr_nid;
330         unsigned int size = VALID_XATTR_BLOCK_SIZE;
331         unsigned int inline_size = inline_xattr_size(inode);
332         void *txattr_addr;
333         int err;
334 
335         txattr_addr = kzalloc(inline_size + size + XATTR_PADDING_SIZE,
336                                                         GFP_F2FS_ZERO);
337         if (!txattr_addr)
338                 return -ENOMEM;
339 
340         /* read from inline xattr */
341         if (inline_size) {
342                 struct page *page = NULL;
343                 void *inline_addr;
344 
345                 if (ipage) {
346                         inline_addr = inline_xattr_addr(ipage);
347                 } else {
348                         page = get_node_page(sbi, inode->i_ino);
349                         if (IS_ERR(page)) {
350                                 err = PTR_ERR(page);
351                                 goto fail;
352                         }
353                         inline_addr = inline_xattr_addr(page);
354                 }
355                 memcpy(txattr_addr, inline_addr, inline_size);
356                 f2fs_put_page(page, 1);
357         }
358 
359         /* read from xattr node block */
360         if (xnid) {
361                 struct page *xpage;
362                 void *xattr_addr;
363 
364                 /* The inode already has an extended attribute block. */
365                 xpage = get_node_page(sbi, xnid);
366                 if (IS_ERR(xpage)) {
367                         err = PTR_ERR(xpage);
368                         goto fail;
369                 }
370 
371                 xattr_addr = page_address(xpage);
372                 memcpy(txattr_addr + inline_size, xattr_addr, size);
373                 f2fs_put_page(xpage, 1);
374         }
375 
376         header = XATTR_HDR(txattr_addr);
377 
378         /* never been allocated xattrs */
379         if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
380                 header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
381                 header->h_refcount = cpu_to_le32(1);
382         }
383         *base_addr = txattr_addr;
384         return 0;
385 fail:
386         kzfree(txattr_addr);
387         return err;
388 }
389 
390 static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
391                                 void *txattr_addr, struct page *ipage)
392 {
393         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
394         size_t inline_size = inline_xattr_size(inode);
395         void *xattr_addr;
396         struct page *xpage;
397         nid_t new_nid = 0;
398         int err;
399 
400         if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
401                 if (!alloc_nid(sbi, &new_nid))
402                         return -ENOSPC;
403 
404         /* write to inline xattr */
405         if (inline_size) {
406                 struct page *page = NULL;
407                 void *inline_addr;
408 
409                 if (ipage) {
410                         inline_addr = inline_xattr_addr(ipage);
411                         f2fs_wait_on_page_writeback(ipage, NODE, true);
412                         set_page_dirty(ipage);
413                 } else {
414                         page = get_node_page(sbi, inode->i_ino);
415                         if (IS_ERR(page)) {
416                                 alloc_nid_failed(sbi, new_nid);
417                                 return PTR_ERR(page);
418                         }
419                         inline_addr = inline_xattr_addr(page);
420                         f2fs_wait_on_page_writeback(page, NODE, true);
421                 }
422                 memcpy(inline_addr, txattr_addr, inline_size);
423                 f2fs_put_page(page, 1);
424 
425                 /* no need to use xattr node block */
426                 if (hsize <= inline_size) {
427                         err = truncate_xattr_node(inode, ipage);
428                         alloc_nid_failed(sbi, new_nid);
429                         return err;
430                 }
431         }
432 
433         /* write to xattr node block */
434         if (F2FS_I(inode)->i_xattr_nid) {
435                 xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
436                 if (IS_ERR(xpage)) {
437                         alloc_nid_failed(sbi, new_nid);
438                         return PTR_ERR(xpage);
439                 }
440                 f2fs_bug_on(sbi, new_nid);
441                 f2fs_wait_on_page_writeback(xpage, NODE, true);
442         } else {
443                 struct dnode_of_data dn;
444                 set_new_dnode(&dn, inode, NULL, NULL, new_nid);
445                 xpage = new_node_page(&dn, XATTR_NODE_OFFSET, ipage);
446                 if (IS_ERR(xpage)) {
447                         alloc_nid_failed(sbi, new_nid);
448                         return PTR_ERR(xpage);
449                 }
450                 alloc_nid_done(sbi, new_nid);
451         }
452 
453         xattr_addr = page_address(xpage);
454         memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE);
455         set_page_dirty(xpage);
456         f2fs_put_page(xpage, 1);
457 
458         return 0;
459 }
460 
461 int f2fs_getxattr(struct inode *inode, int index, const char *name,
462                 void *buffer, size_t buffer_size, struct page *ipage)
463 {
464         struct f2fs_xattr_entry *entry = NULL;
465         int error = 0;
466         unsigned int size, len;
467         void *base_addr = NULL;
468 
469         if (name == NULL)
470                 return -EINVAL;
471 
472         len = strlen(name);
473         if (len > F2FS_NAME_LEN)
474                 return -ERANGE;
475 
476         error = lookup_all_xattrs(inode, ipage, index, len, name,
477                                 &entry, &base_addr);
478         if (error)
479                 return error;
480 
481         size = le16_to_cpu(entry->e_value_size);
482 
483         if (buffer && size > buffer_size) {
484                 error = -ERANGE;
485                 goto out;
486         }
487 
488         if (buffer) {
489                 char *pval = entry->e_name + entry->e_name_len;
490                 memcpy(buffer, pval, size);
491         }
492         error = size;
493 out:
494         kzfree(base_addr);
495         return error;
496 }
497 
498 ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
499 {
500         struct inode *inode = d_inode(dentry);
501         struct f2fs_xattr_entry *entry;
502         void *base_addr;
503         int error = 0;
504         size_t rest = buffer_size;
505 
506         error = read_all_xattrs(inode, NULL, &base_addr);
507         if (error)
508                 return error;
509 
510         list_for_each_xattr(entry, base_addr) {
511                 const struct xattr_handler *handler =
512                         f2fs_xattr_handler(entry->e_name_index);
513                 const char *prefix;
514                 size_t prefix_len;
515                 size_t size;
516 
517                 if (!handler || (handler->list && !handler->list(dentry)))
518                         continue;
519 
520                 prefix = handler->prefix ?: handler->name;
521                 prefix_len = strlen(prefix);
522                 size = prefix_len + entry->e_name_len + 1;
523                 if (buffer) {
524                         if (size > rest) {
525                                 error = -ERANGE;
526                                 goto cleanup;
527                         }
528                         memcpy(buffer, prefix, prefix_len);
529                         buffer += prefix_len;
530                         memcpy(buffer, entry->e_name, entry->e_name_len);
531                         buffer += entry->e_name_len;
532                         *buffer++ = 0;
533                 }
534                 rest -= size;
535         }
536         error = buffer_size - rest;
537 cleanup:
538         kzfree(base_addr);
539         return error;
540 }
541 
542 static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry,
543                                         const void *value, size_t size)
544 {
545         void *pval = entry->e_name + entry->e_name_len;
546 
547         return (le16_to_cpu(entry->e_value_size) == size) &&
548                                         !memcmp(pval, value, size);
549 }
550 
551 static int __f2fs_setxattr(struct inode *inode, int index,
552                         const char *name, const void *value, size_t size,
553                         struct page *ipage, int flags)
554 {
555         struct f2fs_xattr_entry *here, *last;
556         void *base_addr;
557         int found, newsize;
558         size_t len;
559         __u32 new_hsize;
560         int error = 0;
561 
562         if (name == NULL)
563                 return -EINVAL;
564 
565         if (value == NULL)
566                 size = 0;
567 
568         len = strlen(name);
569 
570         if (len > F2FS_NAME_LEN)
571                 return -ERANGE;
572 
573         if (size > MAX_VALUE_LEN(inode))
574                 return -E2BIG;
575 
576         error = read_all_xattrs(inode, ipage, &base_addr);
577         if (error)
578                 return error;
579 
580         /* find entry with wanted name. */
581         here = __find_xattr(base_addr, index, len, name);
582 
583         found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
584 
585         if (found) {
586                 if ((flags & XATTR_CREATE)) {
587                         error = -EEXIST;
588                         goto exit;
589                 }
590 
591                 if (f2fs_xattr_value_same(here, value, size))
592                         goto exit;
593         } else if ((flags & XATTR_REPLACE)) {
594                 error = -ENODATA;
595                 goto exit;
596         }
597 
598         last = here;
599         while (!IS_XATTR_LAST_ENTRY(last))
600                 last = XATTR_NEXT_ENTRY(last);
601 
602         newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
603 
604         /* 1. Check space */
605         if (value) {
606                 int free;
607                 /*
608                  * If value is NULL, it is remove operation.
609                  * In case of update operation, we calculate free.
610                  */
611                 free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
612                 if (found)
613                         free = free + ENTRY_SIZE(here);
614 
615                 if (unlikely(free < newsize)) {
616                         error = -E2BIG;
617                         goto exit;
618                 }
619         }
620 
621         /* 2. Remove old entry */
622         if (found) {
623                 /*
624                  * If entry is found, remove old entry.
625                  * If not found, remove operation is not needed.
626                  */
627                 struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
628                 int oldsize = ENTRY_SIZE(here);
629 
630                 memmove(here, next, (char *)last - (char *)next);
631                 last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
632                 memset(last, 0, oldsize);
633         }
634 
635         new_hsize = (char *)last - (char *)base_addr;
636 
637         /* 3. Write new entry */
638         if (value) {
639                 char *pval;
640                 /*
641                  * Before we come here, old entry is removed.
642                  * We just write new entry.
643                  */
644                 last->e_name_index = index;
645                 last->e_name_len = len;
646                 memcpy(last->e_name, name, len);
647                 pval = last->e_name + len;
648                 memcpy(pval, value, size);
649                 last->e_value_size = cpu_to_le16(size);
650                 new_hsize += newsize;
651         }
652 
653         error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
654         if (error)
655                 goto exit;
656 
657         if (is_inode_flag_set(inode, FI_ACL_MODE)) {
658                 inode->i_mode = F2FS_I(inode)->i_acl_mode;
659                 inode->i_ctime = current_time(inode);
660                 clear_inode_flag(inode, FI_ACL_MODE);
661         }
662         if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
663                         !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
664                 f2fs_set_encrypted_inode(inode);
665         f2fs_mark_inode_dirty_sync(inode, true);
666         if (!error && S_ISDIR(inode->i_mode))
667                 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP);
668 exit:
669         kzfree(base_addr);
670         return error;
671 }
672 
673 int f2fs_setxattr(struct inode *inode, int index, const char *name,
674                                 const void *value, size_t size,
675                                 struct page *ipage, int flags)
676 {
677         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
678         int err;
679 
680         /* this case is only from init_inode_metadata */
681         if (ipage)
682                 return __f2fs_setxattr(inode, index, name, value,
683                                                 size, ipage, flags);
684         f2fs_balance_fs(sbi, true);
685 
686         f2fs_lock_op(sbi);
687         /* protect xattr_ver */
688         down_write(&F2FS_I(inode)->i_sem);
689         err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
690         up_write(&F2FS_I(inode)->i_sem);
691         f2fs_unlock_op(sbi);
692 
693         f2fs_update_time(sbi, REQ_TIME);
694         return err;
695 }
696 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp