dir.h 2.5 KB

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  1. /* SPDX-License-Identifier: GPL-2.0-only */
  2. /*
  3. * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
  4. * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
  5. */
  6. #ifndef __DIR_DOT_H__
  7. #define __DIR_DOT_H__
  8. #include <linux/dcache.h>
  9. #include <linux/crc32.h>
  10. struct inode;
  11. struct gfs2_inode;
  12. struct gfs2_inum;
  13. struct buffer_head;
  14. struct gfs2_dirent;
  15. struct gfs2_diradd {
  16. unsigned nr_blocks;
  17. struct gfs2_dirent *dent;
  18. struct buffer_head *bh;
  19. int save_loc;
  20. };
  21. extern struct inode *gfs2_dir_search(struct inode *dir,
  22. const struct qstr *filename,
  23. bool fail_on_exist);
  24. extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
  25. const struct gfs2_inode *ip);
  26. extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
  27. const struct gfs2_inode *ip, struct gfs2_diradd *da);
  28. static inline void gfs2_dir_no_add(struct gfs2_diradd *da)
  29. {
  30. brelse(da->bh);
  31. da->bh = NULL;
  32. }
  33. extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
  34. extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
  35. struct file_ra_state *f_ra);
  36. extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
  37. const struct gfs2_inode *nip, unsigned int new_type);
  38. extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
  39. extern int gfs2_diradd_alloc_required(struct inode *dir,
  40. const struct qstr *filename,
  41. struct gfs2_diradd *da);
  42. extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
  43. struct buffer_head **bhp);
  44. extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
  45. static inline u32 gfs2_disk_hash(const char *data, int len)
  46. {
  47. return crc32_le((u32)~0, data, len) ^ (u32)~0;
  48. }
  49. static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
  50. {
  51. name->name = fname;
  52. name->len = strlen(fname);
  53. name->hash = gfs2_disk_hash(name->name, name->len);
  54. }
  55. /* N.B. This probably ought to take inum & type as args as well */
  56. static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
  57. {
  58. dent->de_inum.no_addr = cpu_to_be64(0);
  59. dent->de_inum.no_formal_ino = cpu_to_be64(0);
  60. dent->de_hash = cpu_to_be32(name->hash);
  61. dent->de_rec_len = cpu_to_be16(reclen);
  62. dent->de_name_len = cpu_to_be16(name->len);
  63. dent->de_type = cpu_to_be16(0);
  64. memset(dent->__pad, 0, sizeof(dent->__pad));
  65. memcpy(dent + 1, name->name, name->len);
  66. }
  67. extern struct qstr gfs2_qdot;
  68. extern struct qstr gfs2_qdotdot;
  69. #endif /* __DIR_DOT_H__ */