symlink.c 2.7 KB

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  1. /* -*- mode: c; c-basic-offset: 8; -*-
  2. * vim: noexpandtab sw=8 ts=8 sts=0:
  3. *
  4. * linux/cluster/ssi/cfs/symlink.c
  5. *
  6. * This program is free software; you can redistribute it and/or
  7. * modify it under the terms of the GNU General Public License as
  8. * published by the Free Software Foundation; either version 2 of
  9. * the License, or (at your option) any later version.
  10. *
  11. * This program is distributed in the hope that it will be useful,
  12. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE
  14. * or NON INFRINGEMENT. See the GNU General Public License for more
  15. * details.
  16. *
  17. * You should have received a copy of the GNU General Public License
  18. * along with this program; if not, write to the Free Software
  19. * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20. *
  21. * Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net
  22. *
  23. * Copyright (C) 1992 Rick Sladkey
  24. *
  25. * Optimization changes Copyright (C) 1994 Florian La Roche
  26. *
  27. * Jun 7 1999, cache symlink lookups in the page cache. -DaveM
  28. *
  29. * Portions Copyright (C) 2001 Compaq Computer Corporation
  30. *
  31. * ocfs2 symlink handling code.
  32. *
  33. * Copyright (C) 2004, 2005 Oracle.
  34. *
  35. */
  36. #include <linux/fs.h>
  37. #include <linux/types.h>
  38. #include <linux/slab.h>
  39. #include <linux/pagemap.h>
  40. #include <linux/namei.h>
  41. #include <cluster/masklog.h>
  42. #include "ocfs2.h"
  43. #include "alloc.h"
  44. #include "file.h"
  45. #include "inode.h"
  46. #include "journal.h"
  47. #include "symlink.h"
  48. #include "xattr.h"
  49. #include "buffer_head_io.h"
  50. static int ocfs2_fast_symlink_readpage(struct file *unused, struct page *page)
  51. {
  52. struct inode *inode = page->mapping->host;
  53. struct buffer_head *bh = NULL;
  54. int status = ocfs2_read_inode_block(inode, &bh);
  55. struct ocfs2_dinode *fe;
  56. const char *link;
  57. void *kaddr;
  58. size_t len;
  59. if (status < 0) {
  60. mlog_errno(status);
  61. return status;
  62. }
  63. fe = (struct ocfs2_dinode *) bh->b_data;
  64. link = (char *) fe->id2.i_symlink;
  65. /* will be less than a page size */
  66. len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
  67. kaddr = kmap_atomic(page);
  68. memcpy(kaddr, link, len + 1);
  69. kunmap_atomic(kaddr);
  70. SetPageUptodate(page);
  71. unlock_page(page);
  72. brelse(bh);
  73. return 0;
  74. }
  75. const struct address_space_operations ocfs2_fast_symlink_aops = {
  76. .readpage = ocfs2_fast_symlink_readpage,
  77. };
  78. const struct inode_operations ocfs2_symlink_inode_operations = {
  79. .readlink = generic_readlink,
  80. .follow_link = page_follow_link_light,
  81. .put_link = page_put_link,
  82. .getattr = ocfs2_getattr,
  83. .setattr = ocfs2_setattr,
  84. .setxattr = generic_setxattr,
  85. .getxattr = generic_getxattr,
  86. .listxattr = ocfs2_listxattr,
  87. .removexattr = generic_removexattr,
  88. .fiemap = ocfs2_fiemap,
  89. };