v9fs_vfs.h 2.2 KB

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  1. /*
  2. * V9FS VFS extensions.
  3. *
  4. * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
  5. * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
  6. *
  7. * This program is free software; you can redistribute it and/or modify
  8. * it under the terms of the GNU General Public License version 2
  9. * as published by the Free Software Foundation.
  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. See the
  14. * GNU General Public License for more details.
  15. *
  16. * You should have received a copy of the GNU General Public License
  17. * along with this program; if not, write to:
  18. * Free Software Foundation
  19. * 51 Franklin Street, Fifth Floor
  20. * Boston, MA 02111-1301 USA
  21. *
  22. */
  23. /* plan9 semantics are that created files are implicitly opened.
  24. * But linux semantics are that you call create, then open.
  25. * the plan9 approach is superior as it provides an atomic
  26. * open.
  27. * we track the create fid here. When the file is opened, if fidopen is
  28. * non-zero, we use the fid and can skip some steps.
  29. * there may be a better way to do this, but I don't know it.
  30. * one BAD way is to clunk the fid on create, then open it again:
  31. * you lose the atomicity of file open
  32. */
  33. /* special case:
  34. * unlink calls remove, which is an implicit clunk. So we have to track
  35. * that kind of thing so that we don't try to clunk a dead fid.
  36. */
  37. extern struct file_system_type v9fs_fs_type;
  38. extern const struct address_space_operations v9fs_addr_operations;
  39. extern const struct file_operations v9fs_file_operations;
  40. extern const struct file_operations v9fs_dir_operations;
  41. extern struct dentry_operations v9fs_dentry_operations;
  42. extern struct dentry_operations v9fs_cached_dentry_operations;
  43. struct inode *v9fs_get_inode(struct super_block *sb, int mode);
  44. ino_t v9fs_qid2ino(struct v9fs_qid *qid);
  45. void v9fs_stat2inode(struct v9fs_stat *, struct inode *, struct super_block *);
  46. int v9fs_dir_release(struct inode *inode, struct file *filp);
  47. int v9fs_file_open(struct inode *inode, struct file *file);
  48. void v9fs_inode2stat(struct inode *inode, struct v9fs_stat *stat);
  49. void v9fs_dentry_release(struct dentry *);
  50. int v9fs_uflags2omode(int uflags);